net: Add batman-adv meshing protocol

B.A.T.M.A.N. (better approach to mobile ad-hoc networking) is a routing
protocol for multi-hop ad-hoc mesh networks. The networks may be wired or
wireless. See http://www.open-mesh.org/ for more information and user space
tools.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/ABI/testing/sysfs-class-net-batman-adv

+
+What:           /sys/class/net/<iface>/batman-adv/mesh_iface
+Date:           May 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                The /sys/class/net/<iface>/batman-adv/mesh_iface file
+                displays the batman mesh interface this <iface>
+                currently is associated with.
+
+What:           /sys/class/net/<iface>/batman-adv/iface_status
+Date:           May 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                Indicates the status of <iface> as it is seen by batman.

Documentation/ABI/testing/sysfs-class-net-mesh

+
+What:           /sys/class/net/<mesh_iface>/mesh/aggregated_ogms
+Date:           May 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                Indicates whether the batman protocol messages of the
+                mesh <mesh_iface> shall be aggregated or not.
+
+What:           /sys/class/net/<mesh_iface>/mesh/bonding
+Date:           June 2010
+Contact:        Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
+Description:
+                Indicates whether the data traffic going through the
+                mesh will be sent using multiple interfaces at the
+                same time (if available).
+
+What:           /sys/class/net/<mesh_iface>/mesh/fragmentation
+Date:           October 2010
+Contact:        Andreas Langer <an.langer@gmx.de>
+Description:
+                Indicates whether the data traffic going through the
+                mesh will be fragmented or silently discarded if the
+                packet size exceeds the outgoing interface MTU.
+
+What:           /sys/class/net/<mesh_iface>/mesh/gw_bandwidth
+Date:           October 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                Defines the bandwidth which is propagated by this
+                node if gw_mode was set to 'server'.
+
+What:           /sys/class/net/<mesh_iface>/mesh/gw_mode
+Date:           October 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                Defines the state of the gateway features. Can be
+                either 'off', 'client' or 'server'.
+
+What:           /sys/class/net/<mesh_iface>/mesh/gw_sel_class
+Date:           October 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                Defines the selection criteria this node will use
+                to choose a gateway if gw_mode was set to 'client'.
+
+What:           /sys/class/net/<mesh_iface>/mesh/orig_interval
+Date:           May 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                Defines the interval in milliseconds in which batman
+                sends its protocol messages.
+
+What:           /sys/class/net/<mesh_iface>/mesh/hop_penalty
+Date:           Oct 2010
+Contact:        Linus Lüssing <linus.luessing@web.de>
+Description:
+		Defines the penalty which will be applied to an
+		originator message's tq-field on every hop.
+
+What:           /sys/class/net/<mesh_iface>/mesh/vis_mode
+Date:           May 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                Each batman node only maintains information about its
+                own local neighborhood, therefore generating graphs
+                showing the topology of the entire mesh is not easily
+                feasible without having a central instance to collect
+                the local topologies from all nodes. This file allows
+                to activate the collecting (server) mode.

Documentation/networking/batman-adv.txt

+[state: 21-11-2010]
+
+BATMAN-ADV
+----------
+
+Batman  advanced  is  a new approach to wireless networking which
+does no longer operate on the IP basis. Unlike the batman daemon,
+which  exchanges  information  using UDP packets and sets routing
+tables, batman-advanced operates on ISO/OSI Layer 2 only and uses
+and  routes  (or  better: bridges) Ethernet Frames. It emulates a
+virtual network switch of all nodes participating.  Therefore all
+nodes  appear  to be link local, thus all higher operating proto-
+cols won't be affected by any changes within the network. You can
+run almost any protocol above batman advanced, prominent examples
+are: IPv4, IPv6, DHCP, IPX.
+
+Batman advanced was implemented as a Linux kernel driver  to  re-
+duce the overhead to a minimum. It does not depend on any (other)
+network driver, and can be used on wifi as well as ethernet  lan,
+vpn,  etc ... (anything with ethernet-style layer 2).
+
+CONFIGURATION
+-------------
+
+Load the batman-adv module into your kernel:
+
+# insmod batman-adv.ko
+
+The  module  is now waiting for activation. You must add some in-
+terfaces on which batman can operate. After  loading  the  module
+batman  advanced  will scan your systems interfaces to search for
+compatible interfaces. Once found, it will create  subfolders  in
+the /sys directories of each supported interface, e.g.
+
+# ls /sys/class/net/eth0/batman_adv/
+# iface_status  mesh_iface
+
+If an interface does not have the "batman_adv" subfolder it prob-
+ably is not supported. Not supported  interfaces  are:  loopback,
+non-ethernet and batman's own interfaces.
+
+Note:  After the module was loaded it will continuously watch for
+new interfaces to verify the compatibility. There is no  need  to
+reload the module if you plug your USB wifi adapter into your ma-
+chine after batman advanced was initially loaded.
+
+To activate a  given  interface  simply  write  "bat0"  into  its
+"mesh_iface" file inside the batman_adv subfolder:
+
+# echo bat0 > /sys/class/net/eth0/batman_adv/mesh_iface
+
+Repeat  this step for all interfaces you wish to add.  Now batman
+starts using/broadcasting on this/these interface(s).
+
+By reading the "iface_status" file you can check its status:
+
+# cat /sys/class/net/eth0/batman_adv/iface_status
+# active
+
+To deactivate an interface you have  to  write  "none"  into  its
+"mesh_iface" file:
+
+# echo none > /sys/class/net/eth0/batman_adv/mesh_iface
+
+
+All  mesh  wide  settings  can be found in batman's own interface
+folder:
+
+#  ls  /sys/class/net/bat0/mesh/
+#  aggregated_ogms  bonding  fragmentation  orig_interval
+#  vis_mode
+
+
+There is a special folder for debugging informations:
+
+#  ls /sys/kernel/debug/batman_adv/bat0/
+#  originators  socket  transtable_global  transtable_local
+#  vis_data
+
+
+Some of the files contain all sort of status information  regard-
+ing  the  mesh  network.  For  example, you can view the table of
+originators (mesh participants) with:
+
+# cat /sys/kernel/debug/batman_adv/bat0/originators
+
+Other files allow to change batman's behaviour to better fit your
+requirements.  For instance, you can check the current originator
+interval (value in milliseconds which determines how often batman
+sends its broadcast packets):
+
+# cat /sys/class/net/bat0/mesh/orig_interval
+# 1000
+
+and also change its value:
+
+# echo 3000 > /sys/class/net/bat0/mesh/orig_interval
+
+In very mobile scenarios, you might want to adjust the originator
+interval to a lower value. This will make the mesh  more  respon-
+sive to topology changes, but will also increase the overhead.
+
+
+USAGE
+-----
+
+To  make use of your newly created mesh, batman advanced provides
+a new interface "bat0" which you should use from this  point  on.
+All  interfaces  added  to  batman  advanced are not relevant any
+longer because batman handles them for you. Basically, one "hands
+over" the data by using the batman interface and batman will make
+sure it reaches its destination.
+
+The "bat0" interface can be used like any  other  regular  inter-
+face.  It needs an IP address which can be either statically con-
+figured or dynamically (by using DHCP or similar services):
+
+# NodeA: ifconfig bat0 192.168.0.1
+# NodeB: ifconfig bat0 192.168.0.2
+# NodeB: ping 192.168.0.1
+
+Note:  In  order to avoid problems remove all IP addresses previ-
+ously assigned to interfaces now used by batman advanced, e.g.
+
+# ifconfig eth0 0.0.0.0
+
+
+VISUALIZATION
+-------------
+
+If you want topology visualization, at least one mesh  node  must
+be configured as VIS-server:
+
+# echo "server" > /sys/class/net/bat0/mesh/vis_mode
+
+Each  node  is  either configured as "server" or as "client" (de-
+fault: "client").  Clients send their topology data to the server
+next to them, and server synchronize with other servers. If there
+is no server configured (default) within the  mesh,  no  topology
+information   will  be  transmitted.  With  these  "synchronizing
+servers", there can be 1 or more vis servers sharing the same (or
+at least very similar) data.
+
+When  configured  as  server,  you can get a topology snapshot of
+your mesh:
+
+# cat /sys/kernel/debug/batman_adv/bat0/vis_data
+
+This raw output is intended to be easily parsable and convertable
+with  other tools. Have a look at the batctl README if you want a
+vis output in dot or json format for instance and how those  out-
+puts could then be visualised in an image.
+
+The raw format consists of comma separated values per entry where
+each entry is giving information about a  certain  source  inter-
+face.  Each  entry can/has to have the following values:
+-> "mac" - mac address of an originator's source interface
+           (each line begins with it)
+-> "TQ mac  value"  -  src mac's link quality towards mac address
+                       of a neighbor originator's interface which
+                       is being used for routing
+-> "HNA mac" - HNA announced by source mac
+-> "PRIMARY" - this  is a primary interface
+-> "SEC mac" - secondary mac address of source
+               (requires preceding PRIMARY)
+
+The TQ value has a range from 4 to 255 with 255 being  the  best.
+The HNA entries are showing which hosts are connected to the mesh
+via bat0 or being bridged into the mesh network.  The PRIMARY/SEC
+values are only applied on primary interfaces
+
+
+LOGGING/DEBUGGING
+-----------------
+
+All error messages, warnings and information messages are sent to
+the kernel log. Depending on your operating  system  distribution
+this  can  be read in one of a number of ways. Try using the com-
+mands: dmesg, logread, or looking in the files  /var/log/kern.log
+or  /var/log/syslog.  All  batman-adv  messages are prefixed with
+"batman-adv:" So to see just these messages try
+
+# dmesg | grep batman-adv
+
+When investigating problems with your mesh network  it  is  some-
+times  necessary  to see more detail debug messages. This must be
+enabled when compiling the batman-adv module. When building  bat-
+man-adv  as  part of kernel, use "make menuconfig" and enable the
+option "B.A.T.M.A.N. debugging".
+
+Those additional  debug messages can be accessed  using a special
+file in debugfs
+
+# cat /sys/kernel/debug/batman_adv/bat0/log
+
+The additional debug output is by default disabled. It can be en-
+abled  during run time. Following log_levels are defined:
+
+0 - All  debug  output  disabled
+1 - Enable messages related to routing / flooding / broadcasting
+2 - Enable route or hna added / changed / deleted
+3 - Enable all messages
+
+The debug output can be changed at runtime  using  the  file
+/sys/class/net/bat0/mesh/log_level. e.g.
+
+# echo 2 > /sys/class/net/bat0/mesh/log_level
+
+will enable debug messages for when routes or HNAs change.
+
+
+BATCTL
+------
+
+As batman advanced operates on layer 2 all hosts participating in
+the  virtual switch are completely transparent for all  protocols
+above layer 2. Therefore the common diagnosis tools do  not  work
+as  expected.  To  overcome these problems batctl was created. At
+the  moment the  batctl contains ping,  traceroute,  tcpdump  and
+interfaces to the kernel module settings.
+
+For more information, please see the manpage (man batctl).
+
+batctl is available on http://www.open-mesh.org/
+
+
+CONTACT
+-------
+
+Please send us comments, experiences, questions, anything :)
+
+IRC:            #batman   on   irc.freenode.org
+Mailing-list:   b.a.t.m.a.n@b.a.t.m.a.n@lists.open-mesh.org
+                (optional   subscription   at
+                 https://lists.open-mesh.org/mm/listinfo/b.a.t.m.a.n)
+
+You can also contact the Authors:
+
+Marek  Lindner  <lindner_marek@yahoo.de>
+Simon  Wunderlich  <siwu@hrz.tu-chemnitz.de>

MAINTAINERS

@@ -1264,6 +1264,15 @@ S:	Maintained
 F:	drivers/video/backlight/
 F:	include/linux/backlight.h
 
+BATMAN ADVANCED
+M:	Marek Lindner <lindner_marek@yahoo.de>
+M:	Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
+M:	Sven Eckelmann <sven@narfation.org>
+L:	b.a.t.m.a.n@lists.open-mesh.org
+W:	http://www.open-mesh.org/
+S:	Maintained
+F:	net/batman-adv/
+
 BAYCOM/HDLCDRV DRIVERS FOR AX.25
 M:	Thomas Sailer <t.sailer@alumni.ethz.ch>
 L:	linux-hams@vger.kernel.org

net/Kconfig

@@ -214,6 +214,7 @@ source "net/ieee802154/Kconfig"
 source "net/sched/Kconfig"
 source "net/dcb/Kconfig"
 source "net/dns_resolver/Kconfig"
+source "net/batman-adv/Kconfig"
 
 config RPS
 	boolean

net/Makefile

@@ -69,3 +69,4 @@ endif
 obj-$(CONFIG_WIMAX)		+= wimax/
 obj-$(CONFIG_DNS_RESOLVER)	+= dns_resolver/
 obj-$(CONFIG_CEPH_LIB)		+= ceph/
+obj-$(CONFIG_BATMAN_ADV)	+= batman-adv/

net/batman-adv/Kconfig

+#
+# B.A.T.M.A.N meshing protocol
+#
+
+config BATMAN_ADV
+	tristate "B.A.T.M.A.N. Advanced Meshing Protocol"
+	depends on NET
+        default n
+	---help---
+
+        B.A.T.M.A.N. (better approach to mobile ad-hoc networking) is
+        a routing protocol for multi-hop ad-hoc mesh networks. The
+        networks may be wired or wireless. See
+        http://www.open-mesh.org/ for more information and user space
+        tools.
+
+config BATMAN_ADV_DEBUG
+	bool "B.A.T.M.A.N. debugging"
+	depends on BATMAN_ADV != n
+	---help---
+
+	  This is an option for use by developers; most people should
+	  say N here. This enables compilation of support for
+	  outputting debugging information to the kernel log. The
+	  output is controlled via the module parameter debug.

net/batman-adv/Makefile

+#
+# Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+#
+# Marek Lindner, Simon Wunderlich
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of version 2 of the GNU General Public
+# License as published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA
+#
+
+obj-$(CONFIG_BATMAN_ADV) += batman-adv.o
+batman-adv-y += aggregation.o
+batman-adv-y += bat_debugfs.o
+batman-adv-y += bat_sysfs.o
+batman-adv-y += bitarray.o
+batman-adv-y += gateway_client.o
+batman-adv-y += gateway_common.o
+batman-adv-y += hard-interface.o
+batman-adv-y += hash.o
+batman-adv-y += icmp_socket.o
+batman-adv-y += main.o
+batman-adv-y += originator.o
+batman-adv-y += ring_buffer.o
+batman-adv-y += routing.o
+batman-adv-y += send.o
+batman-adv-y += soft-interface.o
+batman-adv-y += translation-table.o
+batman-adv-y += unicast.o
+batman-adv-y += vis.o

net/batman-adv/aggregation.c

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "aggregation.h"
+#include "send.h"
+#include "routing.h"
+
+/* calculate the size of the hna information for a given packet */
+static int hna_len(struct batman_packet *batman_packet)
+{
+	return batman_packet->num_hna * ETH_ALEN;
+}
+
+/* return true if new_packet can be aggregated with forw_packet */
+static bool can_aggregate_with(struct batman_packet *new_batman_packet,
+			       int packet_len,
+			       unsigned long send_time,
+			       bool directlink,
+			       struct batman_if *if_incoming,
+			       struct forw_packet *forw_packet)
+{
+	struct batman_packet *batman_packet =
+		(struct batman_packet *)forw_packet->skb->data;
+	int aggregated_bytes = forw_packet->packet_len + packet_len;
+
+	/**
+	 * we can aggregate the current packet to this aggregated packet
+	 * if:
+	 *
+	 * - the send time is within our MAX_AGGREGATION_MS time
+	 * - the resulting packet wont be bigger than
+	 *   MAX_AGGREGATION_BYTES
+	 */
+
+	if (time_before(send_time, forw_packet->send_time) &&
+	    time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS),
+					forw_packet->send_time) &&
+	    (aggregated_bytes <= MAX_AGGREGATION_BYTES)) {
+
+		/**
+		 * check aggregation compatibility
+		 * -> direct link packets are broadcasted on
+		 *    their interface only
+		 * -> aggregate packet if the current packet is
+		 *    a "global" packet as well as the base
+		 *    packet
+		 */
+
+		/* packets without direct link flag and high TTL
+		 * are flooded through the net  */
+		if ((!directlink) &&
+		    (!(batman_packet->flags & DIRECTLINK)) &&
+		    (batman_packet->ttl != 1) &&
+
+		    /* own packets originating non-primary
+		     * interfaces leave only that interface */
+		    ((!forw_packet->own) ||
+		     (forw_packet->if_incoming->if_num == 0)))
+			return true;
+
+		/* if the incoming packet is sent via this one
+		 * interface only - we still can aggregate */
+		if ((directlink) &&
+		    (new_batman_packet->ttl == 1) &&
+		    (forw_packet->if_incoming == if_incoming) &&
+
+		    /* packets from direct neighbors or
+		     * own secondary interface packets
+		     * (= secondary interface packets in general) */
+		    (batman_packet->flags & DIRECTLINK ||
+		     (forw_packet->own &&
+		      forw_packet->if_incoming->if_num != 0)))
+			return true;
+	}
+
+	return false;
+}
+
+#define atomic_dec_not_zero(v)          atomic_add_unless((v), -1, 0)
+/* create a new aggregated packet and add this packet to it */
+static void new_aggregated_packet(unsigned char *packet_buff, int packet_len,
+				  unsigned long send_time, bool direct_link,
+				  struct batman_if *if_incoming,
+				  int own_packet)
+{
+	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
+	struct forw_packet *forw_packet_aggr;
+	unsigned char *skb_buff;
+
+	/* own packet should always be scheduled */
+	if (!own_packet) {
+		if (!atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
+			bat_dbg(DBG_BATMAN, bat_priv,
+				"batman packet queue full\n");
+			return;
+		}
+	}
+
+	forw_packet_aggr = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC);
+	if (!forw_packet_aggr) {
+		if (!own_packet)
+			atomic_inc(&bat_priv->batman_queue_left);
+		return;
+	}
+
+	if ((atomic_read(&bat_priv->aggregated_ogms)) &&
+	    (packet_len < MAX_AGGREGATION_BYTES))
+		forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES +
+						      sizeof(struct ethhdr));
+	else
+		forw_packet_aggr->skb = dev_alloc_skb(packet_len +
+						      sizeof(struct ethhdr));
+
+	if (!forw_packet_aggr->skb) {
+		if (!own_packet)
+			atomic_inc(&bat_priv->batman_queue_left);
+		kfree(forw_packet_aggr);
+		return;
+	}
+	skb_reserve(forw_packet_aggr->skb, sizeof(struct ethhdr));
+
+	INIT_HLIST_NODE(&forw_packet_aggr->list);
+
+	skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
+	forw_packet_aggr->packet_len = packet_len;
+	memcpy(skb_buff, packet_buff, packet_len);
+
+	forw_packet_aggr->own = own_packet;
+	forw_packet_aggr->if_incoming = if_incoming;
+	forw_packet_aggr->num_packets = 0;
+	forw_packet_aggr->direct_link_flags = 0;
+	forw_packet_aggr->send_time = send_time;
+
+	/* save packet direct link flag status */
+	if (direct_link)
+		forw_packet_aggr->direct_link_flags |= 1;
+
+	/* add new packet to packet list */
+	spin_lock_bh(&bat_priv->forw_bat_list_lock);
+	hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
+	spin_unlock_bh(&bat_priv->forw_bat_list_lock);
+
+	/* start timer for this packet */
+	INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
+			  send_outstanding_bat_packet);
+	queue_delayed_work(bat_event_workqueue,
+			   &forw_packet_aggr->delayed_work,
+			   send_time - jiffies);
+}
+
+/* aggregate a new packet into the existing aggregation */
+static void aggregate(struct forw_packet *forw_packet_aggr,
+		      unsigned char *packet_buff,
+		      int packet_len,
+		      bool direct_link)
+{
+	unsigned char *skb_buff;
+
+	skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
+	memcpy(skb_buff, packet_buff, packet_len);
+	forw_packet_aggr->packet_len += packet_len;
+	forw_packet_aggr->num_packets++;
+
+	/* save packet direct link flag status */
+	if (direct_link)
+		forw_packet_aggr->direct_link_flags |=
+			(1 << forw_packet_aggr->num_packets);
+}
+
+void add_bat_packet_to_list(struct bat_priv *bat_priv,
+			    unsigned char *packet_buff, int packet_len,
+			    struct batman_if *if_incoming, char own_packet,
+			    unsigned long send_time)
+{
+	/**
+	 * _aggr -> pointer to the packet we want to aggregate with
+	 * _pos -> pointer to the position in the queue
+	 */
+	struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL;
+	struct hlist_node *tmp_node;
+	struct batman_packet *batman_packet =
+		(struct batman_packet *)packet_buff;
+	bool direct_link = batman_packet->flags & DIRECTLINK ? 1 : 0;
+
+	/* find position for the packet in the forward queue */
+	spin_lock_bh(&bat_priv->forw_bat_list_lock);
+	/* own packets are not to be aggregated */
+	if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
+		hlist_for_each_entry(forw_packet_pos, tmp_node,
+				     &bat_priv->forw_bat_list, list) {
+			if (can_aggregate_with(batman_packet,
+					       packet_len,
+					       send_time,
+					       direct_link,
+					       if_incoming,
+					       forw_packet_pos)) {
+				forw_packet_aggr = forw_packet_pos;
+				break;
+			}
+		}
+	}
+
+	/* nothing to aggregate with - either aggregation disabled or no
+	 * suitable aggregation packet found */
+	if (!forw_packet_aggr) {
+		/* the following section can run without the lock */
+		spin_unlock_bh(&bat_priv->forw_bat_list_lock);
+
+		/**
+		 * if we could not aggregate this packet with one of the others
+		 * we hold it back for a while, so that it might be aggregated
+		 * later on
+		 */
+		if ((!own_packet) &&
+		    (atomic_read(&bat_priv->aggregated_ogms)))
+			send_time += msecs_to_jiffies(MAX_AGGREGATION_MS);
+
+		new_aggregated_packet(packet_buff, packet_len,
+				      send_time, direct_link,
+				      if_incoming, own_packet);
+	} else {
+		aggregate(forw_packet_aggr,
+			  packet_buff, packet_len,
+			  direct_link);
+		spin_unlock_bh(&bat_priv->forw_bat_list_lock);
+	}
+}
+
+/* unpack the aggregated packets and process them one by one */
+void receive_aggr_bat_packet(struct ethhdr *ethhdr, unsigned char *packet_buff,
+			     int packet_len, struct batman_if *if_incoming)
+{
+	struct batman_packet *batman_packet;
+	int buff_pos = 0;
+	unsigned char *hna_buff;
+
+	batman_packet = (struct batman_packet *)packet_buff;
+
+	do {
+		/* network to host order for our 32bit seqno, and the
+		   orig_interval. */
+		batman_packet->seqno = ntohl(batman_packet->seqno);
+
+		hna_buff = packet_buff + buff_pos + BAT_PACKET_LEN;
+		receive_bat_packet(ethhdr, batman_packet,
+				   hna_buff, hna_len(batman_packet),
+				   if_incoming);
+
+		buff_pos += BAT_PACKET_LEN + hna_len(batman_packet);
+		batman_packet = (struct batman_packet *)
+			(packet_buff + buff_pos);
+	} while (aggregated_packet(buff_pos, packet_len,
+				   batman_packet->num_hna));
+}

net/batman-adv/aggregation.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_AGGREGATION_H_
+#define _NET_BATMAN_ADV_AGGREGATION_H_
+
+#include "main.h"
+
+/* is there another aggregated packet here? */
+static inline int aggregated_packet(int buff_pos, int packet_len, int num_hna)
+{
+	int next_buff_pos = buff_pos + BAT_PACKET_LEN + (num_hna * ETH_ALEN);
+
+	return (next_buff_pos <= packet_len) &&
+		(next_buff_pos <= MAX_AGGREGATION_BYTES);
+}
+
+void add_bat_packet_to_list(struct bat_priv *bat_priv,
+			    unsigned char *packet_buff, int packet_len,
+			    struct batman_if *if_incoming, char own_packet,
+			    unsigned long send_time);
+void receive_aggr_bat_packet(struct ethhdr *ethhdr, unsigned char *packet_buff,
+			     int packet_len, struct batman_if *if_incoming);
+
+#endif /* _NET_BATMAN_ADV_AGGREGATION_H_ */

net/batman-adv/bat_debugfs.c

+/*
+ * Copyright (C) 2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+
+#include <linux/debugfs.h>
+
+#include "bat_debugfs.h"
+#include "translation-table.h"
+#include "originator.h"
+#include "hard-interface.h"
+#include "gateway_common.h"
+#include "gateway_client.h"
+#include "soft-interface.h"
+#include "vis.h"
+#include "icmp_socket.h"
+
+static struct dentry *bat_debugfs;
+
+#ifdef CONFIG_BATMAN_ADV_DEBUG
+#define LOG_BUFF_MASK (log_buff_len-1)
+#define LOG_BUFF(idx) (debug_log->log_buff[(idx) & LOG_BUFF_MASK])
+
+static int log_buff_len = LOG_BUF_LEN;
+
+static void emit_log_char(struct debug_log *debug_log, char c)
+{
+	LOG_BUFF(debug_log->log_end) = c;
+	debug_log->log_end++;
+
+	if (debug_log->log_end - debug_log->log_start > log_buff_len)
+		debug_log->log_start = debug_log->log_end - log_buff_len;
+}
+
+static int fdebug_log(struct debug_log *debug_log, char *fmt, ...)
+{
+	int printed_len;
+	va_list args;
+	static char debug_log_buf[256];
+	char *p;
+
+	if (!debug_log)
+		return 0;
+
+	spin_lock_bh(&debug_log->lock);
+	va_start(args, fmt);
+	printed_len = vscnprintf(debug_log_buf, sizeof(debug_log_buf),
+				 fmt, args);
+	va_end(args);
+
+	for (p = debug_log_buf; *p != 0; p++)
+		emit_log_char(debug_log, *p);
+
+	spin_unlock_bh(&debug_log->lock);
+
+	wake_up(&debug_log->queue_wait);
+
+	return 0;
+}
+
+int debug_log(struct bat_priv *bat_priv, char *fmt, ...)
+{
+	va_list args;
+	char tmp_log_buf[256];
+
+	va_start(args, fmt);
+	vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
+	fdebug_log(bat_priv->debug_log, "[%10u] %s",
+		   (jiffies / HZ), tmp_log_buf);
+	va_end(args);
+
+	return 0;
+}
+
+static int log_open(struct inode *inode, struct file *file)
+{
+	nonseekable_open(inode, file);
+	file->private_data = inode->i_private;
+	inc_module_count();
+	return 0;
+}
+
+static int log_release(struct inode *inode, struct file *file)
+{
+	dec_module_count();
+	return 0;
+}
+
+static ssize_t log_read(struct file *file, char __user *buf,
+			size_t count, loff_t *ppos)
+{
+	struct bat_priv *bat_priv = file->private_data;
+	struct debug_log *debug_log = bat_priv->debug_log;
+	int error, i = 0;
+	char c;
+
+	if ((file->f_flags & O_NONBLOCK) &&
+	    !(debug_log->log_end - debug_log->log_start))
+		return -EAGAIN;
+
+	if ((!buf) || (count < 0))
+		return -EINVAL;
+
+	if (count == 0)
+		return 0;
+
+	if (!access_ok(VERIFY_WRITE, buf, count))
+		return -EFAULT;
+
+	error = wait_event_interruptible(debug_log->queue_wait,
+				(debug_log->log_start - debug_log->log_end));
+
+	if (error)
+		return error;
+
+	spin_lock_bh(&debug_log->lock);
+
+	while ((!error) && (i < count) &&
+	       (debug_log->log_start != debug_log->log_end)) {
+		c = LOG_BUFF(debug_log->log_start);
+
+		debug_log->log_start++;
+
+		spin_unlock_bh(&debug_log->lock);
+
+		error = __put_user(c, buf);
+
+		spin_lock_bh(&debug_log->lock);
+
+		buf++;
+		i++;
+
+	}
+
+	spin_unlock_bh(&debug_log->lock);
+
+	if (!error)
+		return i;
+
+	return error;
+}
+
+static unsigned int log_poll(struct file *file, poll_table *wait)
+{
+	struct bat_priv *bat_priv = file->private_data;
+	struct debug_log *debug_log = bat_priv->debug_log;
+
+	poll_wait(file, &debug_log->queue_wait, wait);
+
+	if (debug_log->log_end - debug_log->log_start)
+		return POLLIN | POLLRDNORM;
+
+	return 0;
+}
+
+static const struct file_operations log_fops = {
+	.open           = log_open,
+	.release        = log_release,
+	.read           = log_read,
+	.poll           = log_poll,
+	.llseek         = no_llseek,
+};
+
+static int debug_log_setup(struct bat_priv *bat_priv)
+{
+	struct dentry *d;
+
+	if (!bat_priv->debug_dir)
+		goto err;
+
+	bat_priv->debug_log = kzalloc(sizeof(struct debug_log), GFP_ATOMIC);
+	if (!bat_priv->debug_log)
+		goto err;
+
+	spin_lock_init(&bat_priv->debug_log->lock);
+	init_waitqueue_head(&bat_priv->debug_log->queue_wait);
+
+	d = debugfs_create_file("log", S_IFREG | S_IRUSR,
+				bat_priv->debug_dir, bat_priv, &log_fops);
+	if (d)
+		goto err;
+
+	return 0;
+
+err:
+	return 1;
+}
+
+static void debug_log_cleanup(struct bat_priv *bat_priv)
+{
+	kfree(bat_priv->debug_log);
+	bat_priv->debug_log = NULL;
+}
+#else /* CONFIG_BATMAN_ADV_DEBUG */
+static int debug_log_setup(struct bat_priv *bat_priv)
+{
+	bat_priv->debug_log = NULL;
+	return 0;
+}
+
+static void debug_log_cleanup(struct bat_priv *bat_priv)
+{
+	return;
+}
+#endif
+
+static int originators_open(struct inode *inode, struct file *file)
+{
+	struct net_device *net_dev = (struct net_device *)inode->i_private;
+	return single_open(file, orig_seq_print_text, net_dev);
+}
+
+static int gateways_open(struct inode *inode, struct file *file)
+{
+	struct net_device *net_dev = (struct net_device *)inode->i_private;
+	return single_open(file, gw_client_seq_print_text, net_dev);
+}
+
+static int softif_neigh_open(struct inode *inode, struct file *file)
+{
+	struct net_device *net_dev = (struct net_device *)inode->i_private;
+	return single_open(file, softif_neigh_seq_print_text, net_dev);
+}
+
+static int transtable_global_open(struct inode *inode, struct file *file)
+{
+	struct net_device *net_dev = (struct net_device *)inode->i_private;
+	return single_open(file, hna_global_seq_print_text, net_dev);
+}
+
+static int transtable_local_open(struct inode *inode, struct file *file)
+{
+	struct net_device *net_dev = (struct net_device *)inode->i_private;
+	return single_open(file, hna_local_seq_print_text, net_dev);
+}
+
+static int vis_data_open(struct inode *inode, struct file *file)
+{
+	struct net_device *net_dev = (struct net_device *)inode->i_private;
+	return single_open(file, vis_seq_print_text, net_dev);
+}
+
+struct bat_debuginfo {
+	struct attribute attr;
+	const struct file_operations fops;
+};
+
+#define BAT_DEBUGINFO(_name, _mode, _open)	\
+struct bat_debuginfo bat_debuginfo_##_name = {	\
+	.attr = { .name = __stringify(_name),	\
+		  .mode = _mode, },		\
+	.fops = { .owner = THIS_MODULE,		\
+		  .open = _open,		\
+		  .read	= seq_read,		\
+		  .llseek = seq_lseek,		\
+		  .release = single_release,	\
+		}				\
+};
+
+static BAT_DEBUGINFO(originators, S_IRUGO, originators_open);
+static BAT_DEBUGINFO(gateways, S_IRUGO, gateways_open);
+static BAT_DEBUGINFO(softif_neigh, S_IRUGO, softif_neigh_open);
+static BAT_DEBUGINFO(transtable_global, S_IRUGO, transtable_global_open);
+static BAT_DEBUGINFO(transtable_local, S_IRUGO, transtable_local_open);
+static BAT_DEBUGINFO(vis_data, S_IRUGO, vis_data_open);
+
+static struct bat_debuginfo *mesh_debuginfos[] = {
+	&bat_debuginfo_originators,
+	&bat_debuginfo_gateways,
+	&bat_debuginfo_softif_neigh,
+	&bat_debuginfo_transtable_global,
+	&bat_debuginfo_transtable_local,
+	&bat_debuginfo_vis_data,
+	NULL,
+};
+
+void debugfs_init(void)
+{
+	bat_debugfs = debugfs_create_dir(DEBUGFS_BAT_SUBDIR, NULL);
+	if (bat_debugfs == ERR_PTR(-ENODEV))
+		bat_debugfs = NULL;
+}
+
+void debugfs_destroy(void)
+{
+	if (bat_debugfs) {
+		debugfs_remove_recursive(bat_debugfs);
+		bat_debugfs = NULL;
+	}
+}
+
+int debugfs_add_meshif(struct net_device *dev)
+{
+	struct bat_priv *bat_priv = netdev_priv(dev);
+	struct bat_debuginfo **bat_debug;
+	struct dentry *file;
+
+	if (!bat_debugfs)
+		goto out;
+
+	bat_priv->debug_dir = debugfs_create_dir(dev->name, bat_debugfs);
+	if (!bat_priv->debug_dir)
+		goto out;
+
+	bat_socket_setup(bat_priv);
+	debug_log_setup(bat_priv);
+
+	for (bat_debug = mesh_debuginfos; *bat_debug; ++bat_debug) {
+		file = debugfs_create_file(((*bat_debug)->attr).name,
+					  S_IFREG | ((*bat_debug)->attr).mode,
+					  bat_priv->debug_dir,
+					  dev, &(*bat_debug)->fops);
+		if (!file) {
+			bat_err(dev, "Can't add debugfs file: %s/%s\n",
+				dev->name, ((*bat_debug)->attr).name);
+			goto rem_attr;
+		}
+	}
+
+	return 0;
+rem_attr:
+	debugfs_remove_recursive(bat_priv->debug_dir);
+	bat_priv->debug_dir = NULL;
+out:
+#ifdef CONFIG_DEBUG_FS
+	return -ENOMEM;
+#else
+	return 0;
+#endif /* CONFIG_DEBUG_FS */
+}
+
+void debugfs_del_meshif(struct net_device *dev)
+{
+	struct bat_priv *bat_priv = netdev_priv(dev);
+
+	debug_log_cleanup(bat_priv);
+
+	if (bat_debugfs) {
+		debugfs_remove_recursive(bat_priv->debug_dir);
+		bat_priv->debug_dir = NULL;
+	}
+}

net/batman-adv/bat_debugfs.h

+/*
+ * Copyright (C) 2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+
+#ifndef _NET_BATMAN_ADV_DEBUGFS_H_
+#define _NET_BATMAN_ADV_DEBUGFS_H_
+
+#define DEBUGFS_BAT_SUBDIR "batman_adv"
+
+void debugfs_init(void);
+void debugfs_destroy(void);
+int debugfs_add_meshif(struct net_device *dev);
+void debugfs_del_meshif(struct net_device *dev);
+
+#endif /* _NET_BATMAN_ADV_DEBUGFS_H_ */

net/batman-adv/bat_sysfs.c

+/*
+ * Copyright (C) 2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "bat_sysfs.h"
+#include "translation-table.h"
+#include "originator.h"
+#include "hard-interface.h"
+#include "gateway_common.h"
+#include "gateway_client.h"
+#include "vis.h"
+
+#define to_dev(obj)		container_of(obj, struct device, kobj)
+#define kobj_to_netdev(obj)	to_net_dev(to_dev(obj->parent))
+#define kobj_to_batpriv(obj)	netdev_priv(kobj_to_netdev(obj))
+
+/* Use this, if you have customized show and store functions */
+#define BAT_ATTR(_name, _mode, _show, _store)	\
+struct bat_attribute bat_attr_##_name = {	\
+	.attr = {.name = __stringify(_name),	\
+		 .mode = _mode },		\
+	.show   = _show,			\
+	.store  = _store,			\
+};
+
+#define BAT_ATTR_STORE_BOOL(_name, _post_func)				\
+ssize_t store_##_name(struct kobject *kobj, struct attribute *attr,	\
+		      char *buff, size_t count)				\
+{									\
+	struct net_device *net_dev = kobj_to_netdev(kobj);		\
+	struct bat_priv *bat_priv = netdev_priv(net_dev);		\
+	return __store_bool_attr(buff, count, _post_func, attr,		\
+				 &bat_priv->_name, net_dev);		\
+}
+
+#define BAT_ATTR_SHOW_BOOL(_name)					\
+ssize_t show_##_name(struct kobject *kobj, struct attribute *attr,	\
+			    char *buff)					\
+{									\
+	struct bat_priv *bat_priv = kobj_to_batpriv(kobj);		\
+	return sprintf(buff, "%s\n",					\
+		       atomic_read(&bat_priv->_name) == 0 ?		\
+		       "disabled" : "enabled");				\
+}									\
+
+/* Use this, if you are going to turn a [name] in bat_priv on or off */
+#define BAT_ATTR_BOOL(_name, _mode, _post_func)				\
+	static BAT_ATTR_STORE_BOOL(_name, _post_func)			\
+	static BAT_ATTR_SHOW_BOOL(_name)				\
+	static BAT_ATTR(_name, _mode, show_##_name, store_##_name)
+
+
+#define BAT_ATTR_STORE_UINT(_name, _min, _max, _post_func)		\
+ssize_t store_##_name(struct kobject *kobj, struct attribute *attr,	\
+			     char *buff, size_t count)			\
+{									\
+	struct net_device *net_dev = kobj_to_netdev(kobj);		\
+	struct bat_priv *bat_priv = netdev_priv(net_dev);		\
+	return __store_uint_attr(buff, count, _min, _max, _post_func,	\
+				 attr, &bat_priv->_name, net_dev);	\
+}
+
+#define BAT_ATTR_SHOW_UINT(_name)					\
+ssize_t show_##_name(struct kobject *kobj, struct attribute *attr,	\
+			    char *buff)					\
+{									\
+	struct bat_priv *bat_priv = kobj_to_batpriv(kobj);		\
+	return sprintf(buff, "%i\n", atomic_read(&bat_priv->_name));	\
+}									\
+
+/* Use this, if you are going to set [name] in bat_priv to unsigned integer
+ * values only */
+#define BAT_ATTR_UINT(_name, _mode, _min, _max, _post_func)		\
+	static BAT_ATTR_STORE_UINT(_name, _min, _max, _post_func)	\
+	static BAT_ATTR_SHOW_UINT(_name)				\
+	static BAT_ATTR(_name, _mode, show_##_name, store_##_name)
+
+
+static int store_bool_attr(char *buff, size_t count,
+			   struct net_device *net_dev,
+			   char *attr_name, atomic_t *attr)
+{
+	int enabled = -1;
+
+	if (buff[count - 1] == '\n')
+		buff[count - 1] = '\0';
+
+	if ((strncmp(buff, "1", 2) == 0) ||
+	    (strncmp(buff, "enable", 7) == 0) ||
+	    (strncmp(buff, "enabled", 8) == 0))
+		enabled = 1;
+
+	if ((strncmp(buff, "0", 2) == 0) ||
+	    (strncmp(buff, "disable", 8) == 0) ||
+	    (strncmp(buff, "disabled", 9) == 0))
+		enabled = 0;
+
+	if (enabled < 0) {
+		bat_info(net_dev,
+			 "%s: Invalid parameter received: %s\n",
+			 attr_name, buff);
+		return -EINVAL;
+	}
+
+	if (atomic_read(attr) == enabled)
+		return count;
+
+	bat_info(net_dev, "%s: Changing from: %s to: %s\n", attr_name,
+		 atomic_read(attr) == 1 ? "enabled" : "disabled",
+		 enabled == 1 ? "enabled" : "disabled");
+
+	atomic_set(attr, (unsigned)enabled);
+	return count;
+}
+
+static inline ssize_t __store_bool_attr(char *buff, size_t count,
+			void (*post_func)(struct net_device *),
+			struct attribute *attr,
+			atomic_t *attr_store, struct net_device *net_dev)
+{
+	int ret;
+
+	ret = store_bool_attr(buff, count, net_dev, (char *)attr->name,
+			      attr_store);
+	if (post_func && ret)
+		post_func(net_dev);
+
+	return ret;
+}
+
+static int store_uint_attr(char *buff, size_t count,
+			   struct net_device *net_dev, char *attr_name,
+			   unsigned int min, unsigned int max, atomic_t *attr)
+{
+	unsigned long uint_val;
+	int ret;
+
+	ret = strict_strtoul(buff, 10, &uint_val);
+	if (ret) {
+		bat_info(net_dev,
+			 "%s: Invalid parameter received: %s\n",
+			 attr_name, buff);
+		return -EINVAL;
+	}
+
+	if (uint_val < min) {
+		bat_info(net_dev, "%s: Value is too small: %lu min: %u\n",
+			 attr_name, uint_val, min);
+		return -EINVAL;
+	}
+
+	if (uint_val > max) {
+		bat_info(net_dev, "%s: Value is too big: %lu max: %u\n",
+			 attr_name, uint_val, max);
+		return -EINVAL;
+	}
+
+	if (atomic_read(attr) == uint_val)
+		return count;
+
+	bat_info(net_dev, "%s: Changing from: %i to: %lu\n",
+		 attr_name, atomic_read(attr), uint_val);
+
+	atomic_set(attr, uint_val);
+	return count;
+}
+
+static inline ssize_t __store_uint_attr(char *buff, size_t count,
+			int min, int max,
+			void (*post_func)(struct net_device *),
+			struct attribute *attr,
+			atomic_t *attr_store, struct net_device *net_dev)
+{
+	int ret;
+
+	ret = store_uint_attr(buff, count, net_dev, (char *)attr->name,
+			      min, max, attr_store);
+	if (post_func && ret)
+		post_func(net_dev);
+
+	return ret;
+}
+
+static ssize_t show_vis_mode(struct kobject *kobj, struct attribute *attr,
+			     char *buff)
+{
+	struct bat_priv *bat_priv = kobj_to_batpriv(kobj);
+	int vis_mode = atomic_read(&bat_priv->vis_mode);
+
+	return sprintf(buff, "%s\n",
+		       vis_mode == VIS_TYPE_CLIENT_UPDATE ?
+							"client" : "server");
+}
+
+static ssize_t store_vis_mode(struct kobject *kobj, struct attribute *attr,
+			      char *buff, size_t count)
+{
+	struct net_device *net_dev = kobj_to_netdev(kobj);
+	struct bat_priv *bat_priv = netdev_priv(net_dev);
+	unsigned long val;
+	int ret, vis_mode_tmp = -1;
+
+	ret = strict_strtoul(buff, 10, &val);
+
+	if (((count == 2) && (!ret) && (val == VIS_TYPE_CLIENT_UPDATE)) ||
+	    (strncmp(buff, "client", 6) == 0) ||
+	    (strncmp(buff, "off", 3) == 0))
+		vis_mode_tmp = VIS_TYPE_CLIENT_UPDATE;
+
+	if (((count == 2) && (!ret) && (val == VIS_TYPE_SERVER_SYNC)) ||
+	    (strncmp(buff, "server", 6) == 0))
+		vis_mode_tmp = VIS_TYPE_SERVER_SYNC;
+
+	if (vis_mode_tmp < 0) {
+		if (buff[count - 1] == '\n')
+			buff[count - 1] = '\0';
+
+		bat_info(net_dev,
+			 "Invalid parameter for 'vis mode' setting received: "
+			 "%s\n", buff);
+		return -EINVAL;
+	}
+
+	if (atomic_read(&bat_priv->vis_mode) == vis_mode_tmp)
+		return count;
+
+	bat_info(net_dev, "Changing vis mode from: %s to: %s\n",
+		 atomic_read(&bat_priv->vis_mode) == VIS_TYPE_CLIENT_UPDATE ?
+		 "client" : "server", vis_mode_tmp == VIS_TYPE_CLIENT_UPDATE ?
+		 "client" : "server");
+
+	atomic_set(&bat_priv->vis_mode, (unsigned)vis_mode_tmp);
+	return count;
+}
+
+static void post_gw_deselect(struct net_device *net_dev)
+{
+	struct bat_priv *bat_priv = netdev_priv(net_dev);
+	gw_deselect(bat_priv);
+}
+
+static ssize_t show_gw_mode(struct kobject *kobj, struct attribute *attr,
+			    char *buff)
+{
+	struct bat_priv *bat_priv = kobj_to_batpriv(kobj);
+	int bytes_written;
+
+	switch (atomic_read(&bat_priv->gw_mode)) {
+	case GW_MODE_CLIENT:
+		bytes_written = sprintf(buff, "%s\n", GW_MODE_CLIENT_NAME);
+		break;
+	case GW_MODE_SERVER:
+		bytes_written = sprintf(buff, "%s\n", GW_MODE_SERVER_NAME);
+		break;
+	default:
+		bytes_written = sprintf(buff, "%s\n", GW_MODE_OFF_NAME);
+		break;
+	}
+
+	return bytes_written;
+}
+
+static ssize_t store_gw_mode(struct kobject *kobj, struct attribute *attr,
+			     char *buff, size_t count)
+{
+	struct net_device *net_dev = kobj_to_netdev(kobj);
+	struct bat_priv *bat_priv = netdev_priv(net_dev);
+	char *curr_gw_mode_str;
+	int gw_mode_tmp = -1;
+
+	if (buff[count - 1] == '\n')
+		buff[count - 1] = '\0';
+
+	if (strncmp(buff, GW_MODE_OFF_NAME, strlen(GW_MODE_OFF_NAME)) == 0)
+		gw_mode_tmp = GW_MODE_OFF;
+
+	if (strncmp(buff, GW_MODE_CLIENT_NAME,
+		   strlen(GW_MODE_CLIENT_NAME)) == 0)
+		gw_mode_tmp = GW_MODE_CLIENT;
+
+	if (strncmp(buff, GW_MODE_SERVER_NAME,
+		   strlen(GW_MODE_SERVER_NAME)) == 0)
+		gw_mode_tmp = GW_MODE_SERVER;
+
+	if (gw_mode_tmp < 0) {
+		bat_info(net_dev,
+			 "Invalid parameter for 'gw mode' setting received: "
+			 "%s\n", buff);
+		return -EINVAL;
+	}
+
+	if (atomic_read(&bat_priv->gw_mode) == gw_mode_tmp)
+		return count;
+
+	switch (atomic_read(&bat_priv->gw_mode)) {
+	case GW_MODE_CLIENT:
+		curr_gw_mode_str = GW_MODE_CLIENT_NAME;
+		break;
+	case GW_MODE_SERVER:
+		curr_gw_mode_str = GW_MODE_SERVER_NAME;
+		break;
+	default:
+		curr_gw_mode_str = GW_MODE_OFF_NAME;
+		break;
+	}
+
+	bat_info(net_dev, "Changing gw mode from: %s to: %s\n",
+		 curr_gw_mode_str, buff);
+
+	gw_deselect(bat_priv);
+	atomic_set(&bat_priv->gw_mode, (unsigned)gw_mode_tmp);
+	return count;
+}
+
+static ssize_t show_gw_bwidth(struct kobject *kobj, struct attribute *attr,
+			      char *buff)
+{
+	struct bat_priv *bat_priv = kobj_to_batpriv(kobj);
+	int down, up;
+	int gw_bandwidth = atomic_read(&bat_priv->gw_bandwidth);
+
+	gw_bandwidth_to_kbit(gw_bandwidth, &down, &up);
+	return sprintf(buff, "%i%s/%i%s\n",
+		       (down > 2048 ? down / 1024 : down),
+		       (down > 2048 ? "MBit" : "KBit"),
+		       (up > 2048 ? up / 1024 : up),
+		       (up > 2048 ? "MBit" : "KBit"));
+}
+
+static ssize_t store_gw_bwidth(struct kobject *kobj, struct attribute *attr,
+			       char *buff, size_t count)
+{
+	struct net_device *net_dev = kobj_to_netdev(kobj);
+
+	if (buff[count - 1] == '\n')
+		buff[count - 1] = '\0';
+
+	return gw_bandwidth_set(net_dev, buff, count);
+}
+
+BAT_ATTR_BOOL(aggregated_ogms, S_IRUGO | S_IWUSR, NULL);
+BAT_ATTR_BOOL(bonding, S_IRUGO | S_IWUSR, NULL);
+BAT_ATTR_BOOL(fragmentation, S_IRUGO | S_IWUSR, update_min_mtu);
+static BAT_ATTR(vis_mode, S_IRUGO | S_IWUSR, show_vis_mode, store_vis_mode);
+static BAT_ATTR(gw_mode, S_IRUGO | S_IWUSR, show_gw_mode, store_gw_mode);
+BAT_ATTR_UINT(orig_interval, S_IRUGO | S_IWUSR, 2 * JITTER, INT_MAX, NULL);
+BAT_ATTR_UINT(hop_penalty, S_IRUGO | S_IWUSR, 0, TQ_MAX_VALUE, NULL);
+BAT_ATTR_UINT(gw_sel_class, S_IRUGO | S_IWUSR, 1, TQ_MAX_VALUE,
+	      post_gw_deselect);
+static BAT_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, show_gw_bwidth,
+		store_gw_bwidth);
+#ifdef CONFIG_BATMAN_ADV_DEBUG
+BAT_ATTR_UINT(log_level, S_IRUGO | S_IWUSR, 0, 3, NULL);
+#endif
+
+static struct bat_attribute *mesh_attrs[] = {
+	&bat_attr_aggregated_ogms,
+	&bat_attr_bonding,
+	&bat_attr_fragmentation,
+	&bat_attr_vis_mode,
+	&bat_attr_gw_mode,
+	&bat_attr_orig_interval,
+	&bat_attr_hop_penalty,
+	&bat_attr_gw_sel_class,
+	&bat_attr_gw_bandwidth,
+#ifdef CONFIG_BATMAN_ADV_DEBUG
+	&bat_attr_log_level,
+#endif
+	NULL,
+};
+
+int sysfs_add_meshif(struct net_device *dev)
+{
+	struct kobject *batif_kobject = &dev->dev.kobj;
+	struct bat_priv *bat_priv = netdev_priv(dev);
+	struct bat_attribute **bat_attr;
+	int err;
+
+	bat_priv->mesh_obj = kobject_create_and_add(SYSFS_IF_MESH_SUBDIR,
+						    batif_kobject);
+	if (!bat_priv->mesh_obj) {
+		bat_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
+			SYSFS_IF_MESH_SUBDIR);
+		goto out;
+	}
+
+	for (bat_attr = mesh_attrs; *bat_attr; ++bat_attr) {
+		err = sysfs_create_file(bat_priv->mesh_obj,
+					&((*bat_attr)->attr));
+		if (err) {
+			bat_err(dev, "Can't add sysfs file: %s/%s/%s\n",
+				dev->name, SYSFS_IF_MESH_SUBDIR,
+				((*bat_attr)->attr).name);
+			goto rem_attr;
+		}
+	}
+
+	return 0;
+
+rem_attr:
+	for (bat_attr = mesh_attrs; *bat_attr; ++bat_attr)
+		sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
+
+	kobject_put(bat_priv->mesh_obj);
+	bat_priv->mesh_obj = NULL;
+out:
+	return -ENOMEM;
+}
+
+void sysfs_del_meshif(struct net_device *dev)
+{
+	struct bat_priv *bat_priv = netdev_priv(dev);
+	struct bat_attribute **bat_attr;
+
+	for (bat_attr = mesh_attrs; *bat_attr; ++bat_attr)
+		sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
+
+	kobject_put(bat_priv->mesh_obj);
+	bat_priv->mesh_obj = NULL;
+}
+
+static ssize_t show_mesh_iface(struct kobject *kobj, struct attribute *attr,
+			       char *buff)
+{
+	struct net_device *net_dev = kobj_to_netdev(kobj);
+	struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
+	ssize_t length;
+
+	if (!batman_if)
+		return 0;
+
+	length = sprintf(buff, "%s\n", batman_if->if_status == IF_NOT_IN_USE ?
+			 "none" : batman_if->soft_iface->name);
+
+	kref_put(&batman_if->refcount, hardif_free_ref);
+
+	return length;
+}
+
+static ssize_t store_mesh_iface(struct kobject *kobj, struct attribute *attr,
+				char *buff, size_t count)
+{
+	struct net_device *net_dev = kobj_to_netdev(kobj);
+	struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
+	int status_tmp = -1;
+	int ret;
+
+	if (!batman_if)
+		return count;
+
+	if (buff[count - 1] == '\n')
+		buff[count - 1] = '\0';
+
+	if (strlen(buff) >= IFNAMSIZ) {
+		pr_err("Invalid parameter for 'mesh_iface' setting received: "
+		       "interface name too long '%s'\n", buff);
+		kref_put(&batman_if->refcount, hardif_free_ref);
+		return -EINVAL;
+	}
+
+	if (strncmp(buff, "none", 4) == 0)
+		status_tmp = IF_NOT_IN_USE;
+	else
+		status_tmp = IF_I_WANT_YOU;
+
+	if ((batman_if->if_status == status_tmp) || ((batman_if->soft_iface) &&
+	    (strncmp(batman_if->soft_iface->name, buff, IFNAMSIZ) == 0))) {
+		kref_put(&batman_if->refcount, hardif_free_ref);
+		return count;
+	}
+
+	if (status_tmp == IF_NOT_IN_USE) {
+		rtnl_lock();
+		hardif_disable_interface(batman_if);
+		rtnl_unlock();
+		kref_put(&batman_if->refcount, hardif_free_ref);
+		return count;
+	}
+
+	/* if the interface already is in use */
+	if (batman_if->if_status != IF_NOT_IN_USE) {
+		rtnl_lock();
+		hardif_disable_interface(batman_if);
+		rtnl_unlock();
+	}
+
+	ret = hardif_enable_interface(batman_if, buff);
+	kref_put(&batman_if->refcount, hardif_free_ref);
+
+	return ret;
+}
+
+static ssize_t show_iface_status(struct kobject *kobj, struct attribute *attr,
+				 char *buff)
+{
+	struct net_device *net_dev = kobj_to_netdev(kobj);
+	struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
+	ssize_t length;
+
+	if (!batman_if)
+		return 0;
+
+	switch (batman_if->if_status) {
+	case IF_TO_BE_REMOVED:
+		length = sprintf(buff, "disabling\n");
+		break;
+	case IF_INACTIVE:
+		length = sprintf(buff, "inactive\n");
+		break;
+	case IF_ACTIVE:
+		length = sprintf(buff, "active\n");
+		break;
+	case IF_TO_BE_ACTIVATED:
+		length = sprintf(buff, "enabling\n");
+		break;
+	case IF_NOT_IN_USE:
+	default:
+		length = sprintf(buff, "not in use\n");
+		break;
+	}
+
+	kref_put(&batman_if->refcount, hardif_free_ref);
+
+	return length;
+}
+
+static BAT_ATTR(mesh_iface, S_IRUGO | S_IWUSR,
+		show_mesh_iface, store_mesh_iface);
+static BAT_ATTR(iface_status, S_IRUGO, show_iface_status, NULL);
+
+static struct bat_attribute *batman_attrs[] = {
+	&bat_attr_mesh_iface,
+	&bat_attr_iface_status,
+	NULL,
+};
+
+int sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev)
+{
+	struct kobject *hardif_kobject = &dev->dev.kobj;
+	struct bat_attribute **bat_attr;
+	int err;
+
+	*hardif_obj = kobject_create_and_add(SYSFS_IF_BAT_SUBDIR,
+						    hardif_kobject);
+
+	if (!*hardif_obj) {
+		bat_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
+			SYSFS_IF_BAT_SUBDIR);
+		goto out;
+	}
+
+	for (bat_attr = batman_attrs; *bat_attr; ++bat_attr) {
+		err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr));
+		if (err) {
+			bat_err(dev, "Can't add sysfs file: %s/%s/%s\n",
+				dev->name, SYSFS_IF_BAT_SUBDIR,
+				((*bat_attr)->attr).name);
+			goto rem_attr;
+		}
+	}
+
+	return 0;
+
+rem_attr:
+	for (bat_attr = batman_attrs; *bat_attr; ++bat_attr)
+		sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr));
+out:
+	return -ENOMEM;
+}
+
+void sysfs_del_hardif(struct kobject **hardif_obj)
+{
+	kobject_put(*hardif_obj);
+	*hardif_obj = NULL;
+}

net/batman-adv/bat_sysfs.h

+/*
+ * Copyright (C) 2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+
+#ifndef _NET_BATMAN_ADV_SYSFS_H_
+#define _NET_BATMAN_ADV_SYSFS_H_
+
+#define SYSFS_IF_MESH_SUBDIR "mesh"
+#define SYSFS_IF_BAT_SUBDIR "batman_adv"
+
+struct bat_attribute {
+	struct attribute attr;
+	ssize_t (*show)(struct kobject *kobj, struct attribute *attr,
+			char *buf);
+	ssize_t (*store)(struct kobject *kobj, struct attribute *attr,
+			 char *buf, size_t count);
+};
+
+int sysfs_add_meshif(struct net_device *dev);
+void sysfs_del_meshif(struct net_device *dev);
+int sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev);
+void sysfs_del_hardif(struct kobject **hardif_obj);
+
+#endif /* _NET_BATMAN_ADV_SYSFS_H_ */

net/batman-adv/bitarray.c

+/*
+ * Copyright (C) 2006-2010 B.A.T.M.A.N. contributors:
+ *
+ * Simon Wunderlich, Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "bitarray.h"
+
+#include <linux/bitops.h>
+
+/* returns true if the corresponding bit in the given seq_bits indicates true
+ * and curr_seqno is within range of last_seqno */
+uint8_t get_bit_status(unsigned long *seq_bits, uint32_t last_seqno,
+		       uint32_t curr_seqno)
+{
+	int32_t diff, word_offset, word_num;
+
+	diff = last_seqno - curr_seqno;
+	if (diff < 0 || diff >= TQ_LOCAL_WINDOW_SIZE) {
+		return 0;
+	} else {
+		/* which word */
+		word_num = (last_seqno - curr_seqno) / WORD_BIT_SIZE;
+		/* which position in the selected word */
+		word_offset = (last_seqno - curr_seqno) % WORD_BIT_SIZE;
+
+		if (test_bit(word_offset, &seq_bits[word_num]))
+			return 1;
+		else
+			return 0;
+	}
+}
+
+/* turn corresponding bit on, so we can remember that we got the packet */
+void bit_mark(unsigned long *seq_bits, int32_t n)
+{
+	int32_t word_offset, word_num;
+
+	/* if too old, just drop it */
+	if (n < 0 || n >= TQ_LOCAL_WINDOW_SIZE)
+		return;
+
+	/* which word */
+	word_num = n / WORD_BIT_SIZE;
+	/* which position in the selected word */
+	word_offset = n % WORD_BIT_SIZE;
+
+	set_bit(word_offset, &seq_bits[word_num]); /* turn the position on */
+}
+
+/* shift the packet array by n places. */
+static void bit_shift(unsigned long *seq_bits, int32_t n)
+{
+	int32_t word_offset, word_num;
+	int32_t i;
+
+	if (n <= 0 || n >= TQ_LOCAL_WINDOW_SIZE)
+		return;
+
+	word_offset = n % WORD_BIT_SIZE;/* shift how much inside each word */
+	word_num = n / WORD_BIT_SIZE;	/* shift over how much (full) words */
+
+	for (i = NUM_WORDS - 1; i > word_num; i--) {
+		/* going from old to new, so we don't overwrite the data we copy
+		 * from.
+		 *
+		 * left is high, right is low: FEDC BA98 7654 3210
+		 *					  ^^ ^^
+		 *			       vvvv
+		 * ^^^^ = from, vvvvv =to, we'd have word_num==1 and
+		 * word_offset==WORD_BIT_SIZE/2 ????? in this example.
+		 * (=24 bits)
+		 *
+		 * our desired output would be: 9876 5432 1000 0000
+		 * */
+
+		seq_bits[i] =
+			(seq_bits[i - word_num] << word_offset) +
+			/* take the lower port from the left half, shift it left
+			 * to its final position */
+			(seq_bits[i - word_num - 1] >>
+			 (WORD_BIT_SIZE-word_offset));
+		/* and the upper part of the right half and shift it left to
+		 * it's position */
+		/* for our example that would be: word[0] = 9800 + 0076 =
+		 * 9876 */
+	}
+	/* now for our last word, i==word_num, we only have the it's "left"
+	 * half. that's the 1000 word in our example.*/
+
+	seq_bits[i] = (seq_bits[i - word_num] << word_offset);
+
+	/* pad the rest with 0, if there is anything */
+	i--;
+
+	for (; i >= 0; i--)
+		seq_bits[i] = 0;
+}
+
+static void bit_reset_window(unsigned long *seq_bits)
+{
+	int i;
+	for (i = 0; i < NUM_WORDS; i++)
+		seq_bits[i] = 0;
+}
+
+
+/* receive and process one packet within the sequence number window.
+ *
+ * returns:
+ *  1 if the window was moved (either new or very old)
+ *  0 if the window was not moved/shifted.
+ */
+char bit_get_packet(void *priv, unsigned long *seq_bits,
+		    int32_t seq_num_diff, int8_t set_mark)
+{
+	struct bat_priv *bat_priv = (struct bat_priv *)priv;
+
+	/* sequence number is slightly older. We already got a sequence number
+	 * higher than this one, so we just mark it. */
+
+	if ((seq_num_diff <= 0) && (seq_num_diff > -TQ_LOCAL_WINDOW_SIZE)) {
+		if (set_mark)
+			bit_mark(seq_bits, -seq_num_diff);
+		return 0;
+	}
+
+	/* sequence number is slightly newer, so we shift the window and
+	 * set the mark if required */
+
+	if ((seq_num_diff > 0) && (seq_num_diff < TQ_LOCAL_WINDOW_SIZE)) {
+		bit_shift(seq_bits, seq_num_diff);
+
+		if (set_mark)
+			bit_mark(seq_bits, 0);
+		return 1;
+	}
+
+	/* sequence number is much newer, probably missed a lot of packets */
+
+	if ((seq_num_diff >= TQ_LOCAL_WINDOW_SIZE)
+		|| (seq_num_diff < EXPECTED_SEQNO_RANGE)) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"We missed a lot of packets (%i) !\n",
+			seq_num_diff - 1);
+		bit_reset_window(seq_bits);
+		if (set_mark)
+			bit_mark(seq_bits, 0);
+		return 1;
+	}
+
+	/* received a much older packet. The other host either restarted
+	 * or the old packet got delayed somewhere in the network. The
+	 * packet should be dropped without calling this function if the
+	 * seqno window is protected. */
+
+	if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE)
+		|| (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
+
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Other host probably restarted!\n");
+
+		bit_reset_window(seq_bits);
+		if (set_mark)
+			bit_mark(seq_bits, 0);
+
+		return 1;
+	}
+
+	/* never reached */
+	return 0;
+}
+
+/* count the hamming weight, how many good packets did we receive? just count
+ * the 1's.
+ */
+int bit_packet_count(unsigned long *seq_bits)
+{
+	int i, hamming = 0;
+
+	for (i = 0; i < NUM_WORDS; i++)
+		hamming += hweight_long(seq_bits[i]);
+
+	return hamming;
+}

net/batman-adv/bitarray.h

+/*
+ * Copyright (C) 2006-2010 B.A.T.M.A.N. contributors:
+ *
+ * Simon Wunderlich, Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_BITARRAY_H_
+#define _NET_BATMAN_ADV_BITARRAY_H_
+
+#define WORD_BIT_SIZE (sizeof(unsigned long) * 8)
+
+/* returns true if the corresponding bit in the given seq_bits indicates true
+ * and curr_seqno is within range of last_seqno */
+uint8_t get_bit_status(unsigned long *seq_bits, uint32_t last_seqno,
+					   uint32_t curr_seqno);
+
+/* turn corresponding bit on, so we can remember that we got the packet */
+void bit_mark(unsigned long *seq_bits, int32_t n);
+
+
+/* receive and process one packet, returns 1 if received seq_num is considered
+ * new, 0 if old  */
+char bit_get_packet(void *priv, unsigned long *seq_bits,
+		    int32_t seq_num_diff, int8_t set_mark);
+
+/* count the hamming weight, how many good packets did we receive? */
+int  bit_packet_count(unsigned long *seq_bits);
+
+#endif /* _NET_BATMAN_ADV_BITARRAY_H_ */

net/batman-adv/gateway_client.c

+/*
+ * Copyright (C) 2009-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "gateway_client.h"
+#include "gateway_common.h"
+#include "hard-interface.h"
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/udp.h>
+#include <linux/if_vlan.h>
+
+static void gw_node_free_ref(struct kref *refcount)
+{
+	struct gw_node *gw_node;
+
+	gw_node = container_of(refcount, struct gw_node, refcount);
+	kfree(gw_node);
+}
+
+static void gw_node_free_rcu(struct rcu_head *rcu)
+{
+	struct gw_node *gw_node;
+
+	gw_node = container_of(rcu, struct gw_node, rcu);
+	kref_put(&gw_node->refcount, gw_node_free_ref);
+}
+
+void *gw_get_selected(struct bat_priv *bat_priv)
+{
+	struct gw_node *curr_gateway_tmp = bat_priv->curr_gw;
+
+	if (!curr_gateway_tmp)
+		return NULL;
+
+	return curr_gateway_tmp->orig_node;
+}
+
+void gw_deselect(struct bat_priv *bat_priv)
+{
+	struct gw_node *gw_node = bat_priv->curr_gw;
+
+	bat_priv->curr_gw = NULL;
+
+	if (gw_node)
+		kref_put(&gw_node->refcount, gw_node_free_ref);
+}
+
+static struct gw_node *gw_select(struct bat_priv *bat_priv,
+			  struct gw_node *new_gw_node)
+{
+	struct gw_node *curr_gw_node = bat_priv->curr_gw;
+
+	if (new_gw_node)
+		kref_get(&new_gw_node->refcount);
+
+	bat_priv->curr_gw = new_gw_node;
+	return curr_gw_node;
+}
+
+void gw_election(struct bat_priv *bat_priv)
+{
+	struct hlist_node *node;
+	struct gw_node *gw_node, *curr_gw_tmp = NULL, *old_gw_node = NULL;
+	uint8_t max_tq = 0;
+	uint32_t max_gw_factor = 0, tmp_gw_factor = 0;
+	int down, up;
+
+	/**
+	 * The batman daemon checks here if we already passed a full originator
+	 * cycle in order to make sure we don't choose the first gateway we
+	 * hear about. This check is based on the daemon's uptime which we
+	 * don't have.
+	 **/
+	if (atomic_read(&bat_priv->gw_mode) != GW_MODE_CLIENT)
+		return;
+
+	if (bat_priv->curr_gw)
+		return;
+
+	rcu_read_lock();
+	if (hlist_empty(&bat_priv->gw_list)) {
+		rcu_read_unlock();
+
+		if (bat_priv->curr_gw) {
+			bat_dbg(DBG_BATMAN, bat_priv,
+				"Removing selected gateway - "
+				"no gateway in range\n");
+			gw_deselect(bat_priv);
+		}
+
+		return;
+	}
+
+	hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
+		if (!gw_node->orig_node->router)
+			continue;
+
+		if (gw_node->deleted)
+			continue;
+
+		switch (atomic_read(&bat_priv->gw_sel_class)) {
+		case 1: /* fast connection */
+			gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags,
+					     &down, &up);
+
+			tmp_gw_factor = (gw_node->orig_node->router->tq_avg *
+					 gw_node->orig_node->router->tq_avg *
+					 down * 100 * 100) /
+					 (TQ_LOCAL_WINDOW_SIZE *
+					 TQ_LOCAL_WINDOW_SIZE * 64);
+
+			if ((tmp_gw_factor > max_gw_factor) ||
+			    ((tmp_gw_factor == max_gw_factor) &&
+			     (gw_node->orig_node->router->tq_avg > max_tq)))
+				curr_gw_tmp = gw_node;
+			break;
+
+		default: /**
+			  * 2:  stable connection (use best statistic)
+			  * 3:  fast-switch (use best statistic but change as
+			  *     soon as a better gateway appears)
+			  * XX: late-switch (use best statistic but change as
+			  *     soon as a better gateway appears which has
+			  *     $routing_class more tq points)
+			  **/
+			if (gw_node->orig_node->router->tq_avg > max_tq)
+				curr_gw_tmp = gw_node;
+			break;
+		}
+
+		if (gw_node->orig_node->router->tq_avg > max_tq)
+			max_tq = gw_node->orig_node->router->tq_avg;
+
+		if (tmp_gw_factor > max_gw_factor)
+			max_gw_factor = tmp_gw_factor;
+	}
+
+	if (bat_priv->curr_gw != curr_gw_tmp) {
+		if ((bat_priv->curr_gw) && (!curr_gw_tmp))
+			bat_dbg(DBG_BATMAN, bat_priv,
+				"Removing selected gateway - "
+				"no gateway in range\n");
+		else if ((!bat_priv->curr_gw) && (curr_gw_tmp))
+			bat_dbg(DBG_BATMAN, bat_priv,
+				"Adding route to gateway %pM "
+				"(gw_flags: %i, tq: %i)\n",
+				curr_gw_tmp->orig_node->orig,
+				curr_gw_tmp->orig_node->gw_flags,
+				curr_gw_tmp->orig_node->router->tq_avg);
+		else
+			bat_dbg(DBG_BATMAN, bat_priv,
+				"Changing route to gateway %pM "
+				"(gw_flags: %i, tq: %i)\n",
+				curr_gw_tmp->orig_node->orig,
+				curr_gw_tmp->orig_node->gw_flags,
+				curr_gw_tmp->orig_node->router->tq_avg);
+
+		old_gw_node = gw_select(bat_priv, curr_gw_tmp);
+	}
+
+	rcu_read_unlock();
+
+	/* the kfree() has to be outside of the rcu lock */
+	if (old_gw_node)
+		kref_put(&old_gw_node->refcount, gw_node_free_ref);
+}
+
+void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node)
+{
+	struct gw_node *curr_gateway_tmp = bat_priv->curr_gw;
+	uint8_t gw_tq_avg, orig_tq_avg;
+
+	if (!curr_gateway_tmp)
+		return;
+
+	if (!curr_gateway_tmp->orig_node)
+		goto deselect;
+
+	if (!curr_gateway_tmp->orig_node->router)
+		goto deselect;
+
+	/* this node already is the gateway */
+	if (curr_gateway_tmp->orig_node == orig_node)
+		return;
+
+	if (!orig_node->router)
+		return;
+
+	gw_tq_avg = curr_gateway_tmp->orig_node->router->tq_avg;
+	orig_tq_avg = orig_node->router->tq_avg;
+
+	/* the TQ value has to be better */
+	if (orig_tq_avg < gw_tq_avg)
+		return;
+
+	/**
+	 * if the routing class is greater than 3 the value tells us how much
+	 * greater the TQ value of the new gateway must be
+	 **/
+	if ((atomic_read(&bat_priv->gw_sel_class) > 3) &&
+	    (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class)))
+		return;
+
+	bat_dbg(DBG_BATMAN, bat_priv,
+		"Restarting gateway selection: better gateway found (tq curr: "
+		"%i, tq new: %i)\n",
+		gw_tq_avg, orig_tq_avg);
+
+deselect:
+	gw_deselect(bat_priv);
+}
+
+static void gw_node_add(struct bat_priv *bat_priv,
+			struct orig_node *orig_node, uint8_t new_gwflags)
+{
+	struct gw_node *gw_node;
+	int down, up;
+
+	gw_node = kmalloc(sizeof(struct gw_node), GFP_ATOMIC);
+	if (!gw_node)
+		return;
+
+	memset(gw_node, 0, sizeof(struct gw_node));
+	INIT_HLIST_NODE(&gw_node->list);
+	gw_node->orig_node = orig_node;
+	kref_init(&gw_node->refcount);
+
+	spin_lock_bh(&bat_priv->gw_list_lock);
+	hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list);
+	spin_unlock_bh(&bat_priv->gw_list_lock);
+
+	gw_bandwidth_to_kbit(new_gwflags, &down, &up);
+	bat_dbg(DBG_BATMAN, bat_priv,
+		"Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n",
+		orig_node->orig, new_gwflags,
+		(down > 2048 ? down / 1024 : down),
+		(down > 2048 ? "MBit" : "KBit"),
+		(up > 2048 ? up / 1024 : up),
+		(up > 2048 ? "MBit" : "KBit"));
+}
+
+void gw_node_update(struct bat_priv *bat_priv,
+		    struct orig_node *orig_node, uint8_t new_gwflags)
+{
+	struct hlist_node *node;
+	struct gw_node *gw_node;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
+		if (gw_node->orig_node != orig_node)
+			continue;
+
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Gateway class of originator %pM changed from "
+			"%i to %i\n",
+			orig_node->orig, gw_node->orig_node->gw_flags,
+			new_gwflags);
+
+		gw_node->deleted = 0;
+
+		if (new_gwflags == 0) {
+			gw_node->deleted = jiffies;
+			bat_dbg(DBG_BATMAN, bat_priv,
+				"Gateway %pM removed from gateway list\n",
+				orig_node->orig);
+
+			if (gw_node == bat_priv->curr_gw) {
+				rcu_read_unlock();
+				gw_deselect(bat_priv);
+				return;
+			}
+		}
+
+		rcu_read_unlock();
+		return;
+	}
+	rcu_read_unlock();
+
+	if (new_gwflags == 0)
+		return;
+
+	gw_node_add(bat_priv, orig_node, new_gwflags);
+}
+
+void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node)
+{
+	return gw_node_update(bat_priv, orig_node, 0);
+}
+
+void gw_node_purge(struct bat_priv *bat_priv)
+{
+	struct gw_node *gw_node;
+	struct hlist_node *node, *node_tmp;
+	unsigned long timeout = 2 * PURGE_TIMEOUT * HZ;
+
+	spin_lock_bh(&bat_priv->gw_list_lock);
+
+	hlist_for_each_entry_safe(gw_node, node, node_tmp,
+				  &bat_priv->gw_list, list) {
+		if (((!gw_node->deleted) ||
+		     (time_before(jiffies, gw_node->deleted + timeout))) &&
+		    atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE)
+			continue;
+
+		if (bat_priv->curr_gw == gw_node)
+			gw_deselect(bat_priv);
+
+		hlist_del_rcu(&gw_node->list);
+		call_rcu(&gw_node->rcu, gw_node_free_rcu);
+	}
+
+
+	spin_unlock_bh(&bat_priv->gw_list_lock);
+}
+
+static int _write_buffer_text(struct bat_priv *bat_priv,
+			      struct seq_file *seq, struct gw_node *gw_node)
+{
+	int down, up;
+
+	gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up);
+
+	return seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n",
+		       (bat_priv->curr_gw == gw_node ? "=>" : "  "),
+		       gw_node->orig_node->orig,
+		       gw_node->orig_node->router->tq_avg,
+		       gw_node->orig_node->router->addr,
+		       gw_node->orig_node->router->if_incoming->net_dev->name,
+		       gw_node->orig_node->gw_flags,
+		       (down > 2048 ? down / 1024 : down),
+		       (down > 2048 ? "MBit" : "KBit"),
+		       (up > 2048 ? up / 1024 : up),
+		       (up > 2048 ? "MBit" : "KBit"));
+}
+
+int gw_client_seq_print_text(struct seq_file *seq, void *offset)
+{
+	struct net_device *net_dev = (struct net_device *)seq->private;
+	struct bat_priv *bat_priv = netdev_priv(net_dev);
+	struct gw_node *gw_node;
+	struct hlist_node *node;
+	int gw_count = 0;
+
+	if (!bat_priv->primary_if) {
+
+		return seq_printf(seq, "BATMAN mesh %s disabled - please "
+				  "specify interfaces to enable it\n",
+				  net_dev->name);
+	}
+
+	if (bat_priv->primary_if->if_status != IF_ACTIVE) {
+
+		return seq_printf(seq, "BATMAN mesh %s disabled - "
+				       "primary interface not active\n",
+				       net_dev->name);
+	}
+
+	seq_printf(seq, "      %-12s (%s/%i) %17s [%10s]: gw_class ... "
+		   "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n",
+		   "Gateway", "#", TQ_MAX_VALUE, "Nexthop",
+		   "outgoingIF", SOURCE_VERSION, REVISION_VERSION_STR,
+		   bat_priv->primary_if->net_dev->name,
+		   bat_priv->primary_if->net_dev->dev_addr, net_dev->name);
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
+		if (gw_node->deleted)
+			continue;
+
+		if (!gw_node->orig_node->router)
+			continue;
+
+		_write_buffer_text(bat_priv, seq, gw_node);
+		gw_count++;
+	}
+	rcu_read_unlock();
+
+	if (gw_count == 0)
+		seq_printf(seq, "No gateways in range ...\n");
+
+	return 0;
+}
+
+int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb)
+{
+	struct ethhdr *ethhdr;
+	struct iphdr *iphdr;
+	struct ipv6hdr *ipv6hdr;
+	struct udphdr *udphdr;
+	unsigned int header_len = 0;
+
+	if (atomic_read(&bat_priv->gw_mode) == GW_MODE_OFF)
+		return 0;
+
+	/* check for ethernet header */
+	if (!pskb_may_pull(skb, header_len + ETH_HLEN))
+		return 0;
+	ethhdr = (struct ethhdr *)skb->data;
+	header_len += ETH_HLEN;
+
+	/* check for initial vlan header */
+	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
+		if (!pskb_may_pull(skb, header_len + VLAN_HLEN))
+			return 0;
+		ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN);
+		header_len += VLAN_HLEN;
+	}
+
+	/* check for ip header */
+	switch (ntohs(ethhdr->h_proto)) {
+	case ETH_P_IP:
+		if (!pskb_may_pull(skb, header_len + sizeof(struct iphdr)))
+			return 0;
+		iphdr = (struct iphdr *)(skb->data + header_len);
+		header_len += iphdr->ihl * 4;
+
+		/* check for udp header */
+		if (iphdr->protocol != IPPROTO_UDP)
+			return 0;
+
+		break;
+	case ETH_P_IPV6:
+		if (!pskb_may_pull(skb, header_len + sizeof(struct ipv6hdr)))
+			return 0;
+		ipv6hdr = (struct ipv6hdr *)(skb->data + header_len);
+		header_len += sizeof(struct ipv6hdr);
+
+		/* check for udp header */
+		if (ipv6hdr->nexthdr != IPPROTO_UDP)
+			return 0;
+
+		break;
+	default:
+		return 0;
+	}
+
+	if (!pskb_may_pull(skb, header_len + sizeof(struct udphdr)))
+		return 0;
+	udphdr = (struct udphdr *)(skb->data + header_len);
+	header_len += sizeof(struct udphdr);
+
+	/* check for bootp port */
+	if ((ntohs(ethhdr->h_proto) == ETH_P_IP) &&
+	     (ntohs(udphdr->dest) != 67))
+		return 0;
+
+	if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) &&
+	    (ntohs(udphdr->dest) != 547))
+		return 0;
+
+	if (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER)
+		return -1;
+
+	if (!bat_priv->curr_gw)
+		return 0;
+
+	return 1;
+}

net/batman-adv/gateway_client.h

+/*
+ * Copyright (C) 2009-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_GATEWAY_CLIENT_H_
+#define _NET_BATMAN_ADV_GATEWAY_CLIENT_H_
+
+void gw_deselect(struct bat_priv *bat_priv);
+void gw_election(struct bat_priv *bat_priv);
+void *gw_get_selected(struct bat_priv *bat_priv);
+void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node);
+void gw_node_update(struct bat_priv *bat_priv,
+		    struct orig_node *orig_node, uint8_t new_gwflags);
+void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node);
+void gw_node_purge(struct bat_priv *bat_priv);
+int gw_client_seq_print_text(struct seq_file *seq, void *offset);
+int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb);
+
+#endif /* _NET_BATMAN_ADV_GATEWAY_CLIENT_H_ */

net/batman-adv/gateway_common.c

+/*
+ * Copyright (C) 2009-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "gateway_common.h"
+#include "gateway_client.h"
+
+/* calculates the gateway class from kbit */
+static void kbit_to_gw_bandwidth(int down, int up, long *gw_srv_class)
+{
+	int mdown = 0, tdown, tup, difference;
+	uint8_t sbit, part;
+
+	*gw_srv_class = 0;
+	difference = 0x0FFFFFFF;
+
+	/* test all downspeeds */
+	for (sbit = 0; sbit < 2; sbit++) {
+		for (part = 0; part < 16; part++) {
+			tdown = 32 * (sbit + 2) * (1 << part);
+
+			if (abs(tdown - down) < difference) {
+				*gw_srv_class = (sbit << 7) + (part << 3);
+				difference = abs(tdown - down);
+				mdown = tdown;
+			}
+		}
+	}
+
+	/* test all upspeeds */
+	difference = 0x0FFFFFFF;
+
+	for (part = 0; part < 8; part++) {
+		tup = ((part + 1) * (mdown)) / 8;
+
+		if (abs(tup - up) < difference) {
+			*gw_srv_class = (*gw_srv_class & 0xF8) | part;
+			difference = abs(tup - up);
+		}
+	}
+}
+
+/* returns the up and downspeeds in kbit, calculated from the class */
+void gw_bandwidth_to_kbit(uint8_t gw_srv_class, int *down, int *up)
+{
+	char sbit = (gw_srv_class & 0x80) >> 7;
+	char dpart = (gw_srv_class & 0x78) >> 3;
+	char upart = (gw_srv_class & 0x07);
+
+	if (!gw_srv_class) {
+		*down = 0;
+		*up = 0;
+		return;
+	}
+
+	*down = 32 * (sbit + 2) * (1 << dpart);
+	*up = ((upart + 1) * (*down)) / 8;
+}
+
+static bool parse_gw_bandwidth(struct net_device *net_dev, char *buff,
+			       long *up, long *down)
+{
+	int ret, multi = 1;
+	char *slash_ptr, *tmp_ptr;
+
+	slash_ptr = strchr(buff, '/');
+	if (slash_ptr)
+		*slash_ptr = 0;
+
+	if (strlen(buff) > 4) {
+		tmp_ptr = buff + strlen(buff) - 4;
+
+		if (strnicmp(tmp_ptr, "mbit", 4) == 0)
+			multi = 1024;
+
+		if ((strnicmp(tmp_ptr, "kbit", 4) == 0) ||
+			(multi > 1))
+			*tmp_ptr = '\0';
+	}
+
+	ret = strict_strtoul(buff, 10, down);
+	if (ret) {
+		bat_err(net_dev,
+			"Download speed of gateway mode invalid: %s\n",
+			buff);
+		return false;
+	}
+
+	*down *= multi;
+
+	/* we also got some upload info */
+	if (slash_ptr) {
+		multi = 1;
+
+		if (strlen(slash_ptr + 1) > 4) {
+			tmp_ptr = slash_ptr + 1 - 4 + strlen(slash_ptr + 1);
+
+			if (strnicmp(tmp_ptr, "mbit", 4) == 0)
+				multi = 1024;
+
+			if ((strnicmp(tmp_ptr, "kbit", 4) == 0) ||
+				(multi > 1))
+				*tmp_ptr = '\0';
+		}
+
+		ret = strict_strtoul(slash_ptr + 1, 10, up);
+		if (ret) {
+			bat_err(net_dev,
+				"Upload speed of gateway mode invalid: "
+				"%s\n", slash_ptr + 1);
+			return false;
+		}
+
+		*up *= multi;
+	}
+
+	return true;
+}
+
+ssize_t gw_bandwidth_set(struct net_device *net_dev, char *buff, size_t count)
+{
+	struct bat_priv *bat_priv = netdev_priv(net_dev);
+	long gw_bandwidth_tmp = 0, up = 0, down = 0;
+	bool ret;
+
+	ret = parse_gw_bandwidth(net_dev, buff, &up, &down);
+	if (!ret)
+		goto end;
+
+	if ((!down) || (down < 256))
+		down = 2000;
+
+	if (!up)
+		up = down / 5;
+
+	kbit_to_gw_bandwidth(down, up, &gw_bandwidth_tmp);
+
+	/**
+	 * the gw bandwidth we guessed above might not match the given
+	 * speeds, hence we need to calculate it back to show the number
+	 * that is going to be propagated
+	 **/
+	gw_bandwidth_to_kbit((uint8_t)gw_bandwidth_tmp,
+			     (int *)&down, (int *)&up);
+
+	gw_deselect(bat_priv);
+	bat_info(net_dev, "Changing gateway bandwidth from: '%i' to: '%ld' "
+		 "(propagating: %ld%s/%ld%s)\n",
+		 atomic_read(&bat_priv->gw_bandwidth), gw_bandwidth_tmp,
+		 (down > 2048 ? down / 1024 : down),
+		 (down > 2048 ? "MBit" : "KBit"),
+		 (up > 2048 ? up / 1024 : up),
+		 (up > 2048 ? "MBit" : "KBit"));
+
+	atomic_set(&bat_priv->gw_bandwidth, gw_bandwidth_tmp);
+
+end:
+	return count;
+}

net/batman-adv/gateway_common.h

+/*
+ * Copyright (C) 2009-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_GATEWAY_COMMON_H_
+#define _NET_BATMAN_ADV_GATEWAY_COMMON_H_
+
+enum gw_modes {
+	GW_MODE_OFF,
+	GW_MODE_CLIENT,
+	GW_MODE_SERVER,
+};
+
+#define GW_MODE_OFF_NAME	"off"
+#define GW_MODE_CLIENT_NAME	"client"
+#define GW_MODE_SERVER_NAME	"server"
+
+void gw_bandwidth_to_kbit(uint8_t gw_class, int *down, int *up);
+ssize_t gw_bandwidth_set(struct net_device *net_dev, char *buff, size_t count);
+
+#endif /* _NET_BATMAN_ADV_GATEWAY_COMMON_H_ */

net/batman-adv/hard-interface.c

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "hard-interface.h"
+#include "soft-interface.h"
+#include "send.h"
+#include "translation-table.h"
+#include "routing.h"
+#include "bat_sysfs.h"
+#include "originator.h"
+#include "hash.h"
+
+#include <linux/if_arp.h>
+
+/* protect update critical side of if_list - but not the content */
+static DEFINE_SPINLOCK(if_list_lock);
+
+static void hardif_free_rcu(struct rcu_head *rcu)
+{
+	struct batman_if *batman_if;
+
+	batman_if = container_of(rcu, struct batman_if, rcu);
+	dev_put(batman_if->net_dev);
+	kref_put(&batman_if->refcount, hardif_free_ref);
+}
+
+struct batman_if *get_batman_if_by_netdev(struct net_device *net_dev)
+{
+	struct batman_if *batman_if;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(batman_if, &if_list, list) {
+		if (batman_if->net_dev == net_dev)
+			goto out;
+	}
+
+	batman_if = NULL;
+
+out:
+	if (batman_if)
+		kref_get(&batman_if->refcount);
+
+	rcu_read_unlock();
+	return batman_if;
+}
+
+static int is_valid_iface(struct net_device *net_dev)
+{
+	if (net_dev->flags & IFF_LOOPBACK)
+		return 0;
+
+	if (net_dev->type != ARPHRD_ETHER)
+		return 0;
+
+	if (net_dev->addr_len != ETH_ALEN)
+		return 0;
+
+	/* no batman over batman */
+#ifdef HAVE_NET_DEVICE_OPS
+	if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
+		return 0;
+#else
+	if (net_dev->hard_start_xmit == interface_tx)
+		return 0;
+#endif
+
+	/* Device is being bridged */
+	/* if (net_dev->priv_flags & IFF_BRIDGE_PORT)
+		return 0; */
+
+	return 1;
+}
+
+static struct batman_if *get_active_batman_if(struct net_device *soft_iface)
+{
+	struct batman_if *batman_if;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(batman_if, &if_list, list) {
+		if (batman_if->soft_iface != soft_iface)
+			continue;
+
+		if (batman_if->if_status == IF_ACTIVE)
+			goto out;
+	}
+
+	batman_if = NULL;
+
+out:
+	if (batman_if)
+		kref_get(&batman_if->refcount);
+
+	rcu_read_unlock();
+	return batman_if;
+}
+
+static void update_primary_addr(struct bat_priv *bat_priv)
+{
+	struct vis_packet *vis_packet;
+
+	vis_packet = (struct vis_packet *)
+				bat_priv->my_vis_info->skb_packet->data;
+	memcpy(vis_packet->vis_orig,
+	       bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+	memcpy(vis_packet->sender_orig,
+	       bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+}
+
+static void set_primary_if(struct bat_priv *bat_priv,
+			   struct batman_if *batman_if)
+{
+	struct batman_packet *batman_packet;
+	struct batman_if *old_if;
+
+	if (batman_if)
+		kref_get(&batman_if->refcount);
+
+	old_if = bat_priv->primary_if;
+	bat_priv->primary_if = batman_if;
+
+	if (old_if)
+		kref_put(&old_if->refcount, hardif_free_ref);
+
+	if (!bat_priv->primary_if)
+		return;
+
+	batman_packet = (struct batman_packet *)(batman_if->packet_buff);
+	batman_packet->flags = PRIMARIES_FIRST_HOP;
+	batman_packet->ttl = TTL;
+
+	update_primary_addr(bat_priv);
+
+	/***
+	 * hacky trick to make sure that we send the HNA information via
+	 * our new primary interface
+	 */
+	atomic_set(&bat_priv->hna_local_changed, 1);
+}
+
+static bool hardif_is_iface_up(struct batman_if *batman_if)
+{
+	if (batman_if->net_dev->flags & IFF_UP)
+		return true;
+
+	return false;
+}
+
+static void update_mac_addresses(struct batman_if *batman_if)
+{
+	memcpy(((struct batman_packet *)(batman_if->packet_buff))->orig,
+	       batman_if->net_dev->dev_addr, ETH_ALEN);
+	memcpy(((struct batman_packet *)(batman_if->packet_buff))->prev_sender,
+	       batman_if->net_dev->dev_addr, ETH_ALEN);
+}
+
+static void check_known_mac_addr(struct net_device *net_dev)
+{
+	struct batman_if *batman_if;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(batman_if, &if_list, list) {
+		if ((batman_if->if_status != IF_ACTIVE) &&
+		    (batman_if->if_status != IF_TO_BE_ACTIVATED))
+			continue;
+
+		if (batman_if->net_dev == net_dev)
+			continue;
+
+		if (!compare_orig(batman_if->net_dev->dev_addr,
+				  net_dev->dev_addr))
+			continue;
+
+		pr_warning("The newly added mac address (%pM) already exists "
+			   "on: %s\n", net_dev->dev_addr,
+			   batman_if->net_dev->name);
+		pr_warning("It is strongly recommended to keep mac addresses "
+			   "unique to avoid problems!\n");
+	}
+	rcu_read_unlock();
+}
+
+int hardif_min_mtu(struct net_device *soft_iface)
+{
+	struct bat_priv *bat_priv = netdev_priv(soft_iface);
+	struct batman_if *batman_if;
+	/* allow big frames if all devices are capable to do so
+	 * (have MTU > 1500 + BAT_HEADER_LEN) */
+	int min_mtu = ETH_DATA_LEN;
+
+	if (atomic_read(&bat_priv->fragmentation))
+		goto out;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(batman_if, &if_list, list) {
+		if ((batman_if->if_status != IF_ACTIVE) &&
+		    (batman_if->if_status != IF_TO_BE_ACTIVATED))
+			continue;
+
+		if (batman_if->soft_iface != soft_iface)
+			continue;
+
+		min_mtu = min_t(int, batman_if->net_dev->mtu - BAT_HEADER_LEN,
+				min_mtu);
+	}
+	rcu_read_unlock();
+out:
+	return min_mtu;
+}
+
+/* adjusts the MTU if a new interface with a smaller MTU appeared. */
+void update_min_mtu(struct net_device *soft_iface)
+{
+	int min_mtu;
+
+	min_mtu = hardif_min_mtu(soft_iface);
+	if (soft_iface->mtu != min_mtu)
+		soft_iface->mtu = min_mtu;
+}
+
+static void hardif_activate_interface(struct batman_if *batman_if)
+{
+	struct bat_priv *bat_priv;
+
+	if (batman_if->if_status != IF_INACTIVE)
+		return;
+
+	bat_priv = netdev_priv(batman_if->soft_iface);
+
+	update_mac_addresses(batman_if);
+	batman_if->if_status = IF_TO_BE_ACTIVATED;
+
+	/**
+	 * the first active interface becomes our primary interface or
+	 * the next active interface after the old primay interface was removed
+	 */
+	if (!bat_priv->primary_if)
+		set_primary_if(bat_priv, batman_if);
+
+	bat_info(batman_if->soft_iface, "Interface activated: %s\n",
+		 batman_if->net_dev->name);
+
+	update_min_mtu(batman_if->soft_iface);
+	return;
+}
+
+static void hardif_deactivate_interface(struct batman_if *batman_if)
+{
+	if ((batman_if->if_status != IF_ACTIVE) &&
+	   (batman_if->if_status != IF_TO_BE_ACTIVATED))
+		return;
+
+	batman_if->if_status = IF_INACTIVE;
+
+	bat_info(batman_if->soft_iface, "Interface deactivated: %s\n",
+		 batman_if->net_dev->name);
+
+	update_min_mtu(batman_if->soft_iface);
+}
+
+int hardif_enable_interface(struct batman_if *batman_if, char *iface_name)
+{
+	struct bat_priv *bat_priv;
+	struct batman_packet *batman_packet;
+
+	if (batman_if->if_status != IF_NOT_IN_USE)
+		goto out;
+
+	batman_if->soft_iface = dev_get_by_name(&init_net, iface_name);
+
+	if (!batman_if->soft_iface) {
+		batman_if->soft_iface = softif_create(iface_name);
+
+		if (!batman_if->soft_iface)
+			goto err;
+
+		/* dev_get_by_name() increases the reference counter for us */
+		dev_hold(batman_if->soft_iface);
+	}
+
+	bat_priv = netdev_priv(batman_if->soft_iface);
+	batman_if->packet_len = BAT_PACKET_LEN;
+	batman_if->packet_buff = kmalloc(batman_if->packet_len, GFP_ATOMIC);
+
+	if (!batman_if->packet_buff) {
+		bat_err(batman_if->soft_iface, "Can't add interface packet "
+			"(%s): out of memory\n", batman_if->net_dev->name);
+		goto err;
+	}
+
+	batman_packet = (struct batman_packet *)(batman_if->packet_buff);
+	batman_packet->packet_type = BAT_PACKET;
+	batman_packet->version = COMPAT_VERSION;
+	batman_packet->flags = 0;
+	batman_packet->ttl = 2;
+	batman_packet->tq = TQ_MAX_VALUE;
+	batman_packet->num_hna = 0;
+
+	batman_if->if_num = bat_priv->num_ifaces;
+	bat_priv->num_ifaces++;
+	batman_if->if_status = IF_INACTIVE;
+	orig_hash_add_if(batman_if, bat_priv->num_ifaces);
+
+	batman_if->batman_adv_ptype.type = __constant_htons(ETH_P_BATMAN);
+	batman_if->batman_adv_ptype.func = batman_skb_recv;
+	batman_if->batman_adv_ptype.dev = batman_if->net_dev;
+	kref_get(&batman_if->refcount);
+	dev_add_pack(&batman_if->batman_adv_ptype);
+
+	atomic_set(&batman_if->seqno, 1);
+	atomic_set(&batman_if->frag_seqno, 1);
+	bat_info(batman_if->soft_iface, "Adding interface: %s\n",
+		 batman_if->net_dev->name);
+
+	if (atomic_read(&bat_priv->fragmentation) && batman_if->net_dev->mtu <
+		ETH_DATA_LEN + BAT_HEADER_LEN)
+		bat_info(batman_if->soft_iface,
+			"The MTU of interface %s is too small (%i) to handle "
+			"the transport of batman-adv packets. Packets going "
+			"over this interface will be fragmented on layer2 "
+			"which could impact the performance. Setting the MTU "
+			"to %zi would solve the problem.\n",
+			batman_if->net_dev->name, batman_if->net_dev->mtu,
+			ETH_DATA_LEN + BAT_HEADER_LEN);
+
+	if (!atomic_read(&bat_priv->fragmentation) && batman_if->net_dev->mtu <
+		ETH_DATA_LEN + BAT_HEADER_LEN)
+		bat_info(batman_if->soft_iface,
+			"The MTU of interface %s is too small (%i) to handle "
+			"the transport of batman-adv packets. If you experience"
+			" problems getting traffic through try increasing the "
+			"MTU to %zi.\n",
+			batman_if->net_dev->name, batman_if->net_dev->mtu,
+			ETH_DATA_LEN + BAT_HEADER_LEN);
+
+	if (hardif_is_iface_up(batman_if))
+		hardif_activate_interface(batman_if);
+	else
+		bat_err(batman_if->soft_iface, "Not using interface %s "
+			"(retrying later): interface not active\n",
+			batman_if->net_dev->name);
+
+	/* begin scheduling originator messages on that interface */
+	schedule_own_packet(batman_if);
+
+out:
+	return 0;
+
+err:
+	return -ENOMEM;
+}
+
+void hardif_disable_interface(struct batman_if *batman_if)
+{
+	struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
+
+	if (batman_if->if_status == IF_ACTIVE)
+		hardif_deactivate_interface(batman_if);
+
+	if (batman_if->if_status != IF_INACTIVE)
+		return;
+
+	bat_info(batman_if->soft_iface, "Removing interface: %s\n",
+		 batman_if->net_dev->name);
+	dev_remove_pack(&batman_if->batman_adv_ptype);
+	kref_put(&batman_if->refcount, hardif_free_ref);
+
+	bat_priv->num_ifaces--;
+	orig_hash_del_if(batman_if, bat_priv->num_ifaces);
+
+	if (batman_if == bat_priv->primary_if) {
+		struct batman_if *new_if;
+
+		new_if = get_active_batman_if(batman_if->soft_iface);
+		set_primary_if(bat_priv, new_if);
+
+		if (new_if)
+			kref_put(&new_if->refcount, hardif_free_ref);
+	}
+
+	kfree(batman_if->packet_buff);
+	batman_if->packet_buff = NULL;
+	batman_if->if_status = IF_NOT_IN_USE;
+
+	/* delete all references to this batman_if */
+	purge_orig_ref(bat_priv);
+	purge_outstanding_packets(bat_priv, batman_if);
+	dev_put(batman_if->soft_iface);
+
+	/* nobody uses this interface anymore */
+	if (!bat_priv->num_ifaces)
+		softif_destroy(batman_if->soft_iface);
+
+	batman_if->soft_iface = NULL;
+}
+
+static struct batman_if *hardif_add_interface(struct net_device *net_dev)
+{
+	struct batman_if *batman_if;
+	int ret;
+
+	ret = is_valid_iface(net_dev);
+	if (ret != 1)
+		goto out;
+
+	dev_hold(net_dev);
+
+	batman_if = kmalloc(sizeof(struct batman_if), GFP_ATOMIC);
+	if (!batman_if) {
+		pr_err("Can't add interface (%s): out of memory\n",
+		       net_dev->name);
+		goto release_dev;
+	}
+
+	ret = sysfs_add_hardif(&batman_if->hardif_obj, net_dev);
+	if (ret)
+		goto free_if;
+
+	batman_if->if_num = -1;
+	batman_if->net_dev = net_dev;
+	batman_if->soft_iface = NULL;
+	batman_if->if_status = IF_NOT_IN_USE;
+	INIT_LIST_HEAD(&batman_if->list);
+	kref_init(&batman_if->refcount);
+
+	check_known_mac_addr(batman_if->net_dev);
+
+	spin_lock(&if_list_lock);
+	list_add_tail_rcu(&batman_if->list, &if_list);
+	spin_unlock(&if_list_lock);
+
+	/* extra reference for return */
+	kref_get(&batman_if->refcount);
+	return batman_if;
+
+free_if:
+	kfree(batman_if);
+release_dev:
+	dev_put(net_dev);
+out:
+	return NULL;
+}
+
+static void hardif_remove_interface(struct batman_if *batman_if)
+{
+	/* first deactivate interface */
+	if (batman_if->if_status != IF_NOT_IN_USE)
+		hardif_disable_interface(batman_if);
+
+	if (batman_if->if_status != IF_NOT_IN_USE)
+		return;
+
+	batman_if->if_status = IF_TO_BE_REMOVED;
+	sysfs_del_hardif(&batman_if->hardif_obj);
+	call_rcu(&batman_if->rcu, hardif_free_rcu);
+}
+
+void hardif_remove_interfaces(void)
+{
+	struct batman_if *batman_if, *batman_if_tmp;
+	struct list_head if_queue;
+
+	INIT_LIST_HEAD(&if_queue);
+
+	spin_lock(&if_list_lock);
+	list_for_each_entry_safe(batman_if, batman_if_tmp, &if_list, list) {
+		list_del_rcu(&batman_if->list);
+		list_add_tail(&batman_if->list, &if_queue);
+	}
+	spin_unlock(&if_list_lock);
+
+	rtnl_lock();
+	list_for_each_entry_safe(batman_if, batman_if_tmp, &if_queue, list) {
+		hardif_remove_interface(batman_if);
+	}
+	rtnl_unlock();
+}
+
+static int hard_if_event(struct notifier_block *this,
+			 unsigned long event, void *ptr)
+{
+	struct net_device *net_dev = (struct net_device *)ptr;
+	struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
+	struct bat_priv *bat_priv;
+
+	if (!batman_if && event == NETDEV_REGISTER)
+		batman_if = hardif_add_interface(net_dev);
+
+	if (!batman_if)
+		goto out;
+
+	switch (event) {
+	case NETDEV_UP:
+		hardif_activate_interface(batman_if);
+		break;
+	case NETDEV_GOING_DOWN:
+	case NETDEV_DOWN:
+		hardif_deactivate_interface(batman_if);
+		break;
+	case NETDEV_UNREGISTER:
+		spin_lock(&if_list_lock);
+		list_del_rcu(&batman_if->list);
+		spin_unlock(&if_list_lock);
+
+		hardif_remove_interface(batman_if);
+		break;
+	case NETDEV_CHANGEMTU:
+		if (batman_if->soft_iface)
+			update_min_mtu(batman_if->soft_iface);
+		break;
+	case NETDEV_CHANGEADDR:
+		if (batman_if->if_status == IF_NOT_IN_USE)
+			goto hardif_put;
+
+		check_known_mac_addr(batman_if->net_dev);
+		update_mac_addresses(batman_if);
+
+		bat_priv = netdev_priv(batman_if->soft_iface);
+		if (batman_if == bat_priv->primary_if)
+			update_primary_addr(bat_priv);
+		break;
+	default:
+		break;
+	};
+
+hardif_put:
+	kref_put(&batman_if->refcount, hardif_free_ref);
+out:
+	return NOTIFY_DONE;
+}
+
+/* receive a packet with the batman ethertype coming on a hard
+ * interface */
+int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
+	struct packet_type *ptype, struct net_device *orig_dev)
+{
+	struct bat_priv *bat_priv;
+	struct batman_packet *batman_packet;
+	struct batman_if *batman_if;
+	int ret;
+
+	batman_if = container_of(ptype, struct batman_if, batman_adv_ptype);
+	skb = skb_share_check(skb, GFP_ATOMIC);
+
+	/* skb was released by skb_share_check() */
+	if (!skb)
+		goto err_out;
+
+	/* packet should hold at least type and version */
+	if (unlikely(!pskb_may_pull(skb, 2)))
+		goto err_free;
+
+	/* expect a valid ethernet header here. */
+	if (unlikely(skb->mac_len != sizeof(struct ethhdr)
+				|| !skb_mac_header(skb)))
+		goto err_free;
+
+	if (!batman_if->soft_iface)
+		goto err_free;
+
+	bat_priv = netdev_priv(batman_if->soft_iface);
+
+	if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
+		goto err_free;
+
+	/* discard frames on not active interfaces */
+	if (batman_if->if_status != IF_ACTIVE)
+		goto err_free;
+
+	batman_packet = (struct batman_packet *)skb->data;
+
+	if (batman_packet->version != COMPAT_VERSION) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Drop packet: incompatible batman version (%i)\n",
+			batman_packet->version);
+		goto err_free;
+	}
+
+	/* all receive handlers return whether they received or reused
+	 * the supplied skb. if not, we have to free the skb. */
+
+	switch (batman_packet->packet_type) {
+		/* batman originator packet */
+	case BAT_PACKET:
+		ret = recv_bat_packet(skb, batman_if);
+		break;
+
+		/* batman icmp packet */
+	case BAT_ICMP:
+		ret = recv_icmp_packet(skb, batman_if);
+		break;
+
+		/* unicast packet */
+	case BAT_UNICAST:
+		ret = recv_unicast_packet(skb, batman_if);
+		break;
+
+		/* fragmented unicast packet */
+	case BAT_UNICAST_FRAG:
+		ret = recv_ucast_frag_packet(skb, batman_if);
+		break;
+
+		/* broadcast packet */
+	case BAT_BCAST:
+		ret = recv_bcast_packet(skb, batman_if);
+		break;
+
+		/* vis packet */
+	case BAT_VIS:
+		ret = recv_vis_packet(skb, batman_if);
+		break;
+	default:
+		ret = NET_RX_DROP;
+	}
+
+	if (ret == NET_RX_DROP)
+		kfree_skb(skb);
+
+	/* return NET_RX_SUCCESS in any case as we
+	 * most probably dropped the packet for
+	 * routing-logical reasons. */
+
+	return NET_RX_SUCCESS;
+
+err_free:
+	kfree_skb(skb);
+err_out:
+	return NET_RX_DROP;
+}
+
+struct notifier_block hard_if_notifier = {
+	.notifier_call = hard_if_event,
+};

net/batman-adv/hard-interface.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_HARD_INTERFACE_H_
+#define _NET_BATMAN_ADV_HARD_INTERFACE_H_
+
+#define IF_NOT_IN_USE 0
+#define IF_TO_BE_REMOVED 1
+#define IF_INACTIVE 2
+#define IF_ACTIVE 3
+#define IF_TO_BE_ACTIVATED 4
+#define IF_I_WANT_YOU 5
+
+extern struct notifier_block hard_if_notifier;
+
+struct batman_if *get_batman_if_by_netdev(struct net_device *net_dev);
+int hardif_enable_interface(struct batman_if *batman_if, char *iface_name);
+void hardif_disable_interface(struct batman_if *batman_if);
+void hardif_remove_interfaces(void);
+int batman_skb_recv(struct sk_buff *skb,
+				struct net_device *dev,
+				struct packet_type *ptype,
+				struct net_device *orig_dev);
+int hardif_min_mtu(struct net_device *soft_iface);
+void update_min_mtu(struct net_device *soft_iface);
+
+static inline void hardif_free_ref(struct kref *refcount)
+{
+	struct batman_if *batman_if;
+
+	batman_if = container_of(refcount, struct batman_if, refcount);
+	kfree(batman_if);
+}
+
+#endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */

net/batman-adv/hash.c

+/*
+ * Copyright (C) 2006-2010 B.A.T.M.A.N. contributors:
+ *
+ * Simon Wunderlich, Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "hash.h"
+
+/* clears the hash */
+static void hash_init(struct hashtable_t *hash)
+{
+	int i;
+
+	for (i = 0 ; i < hash->size; i++)
+		INIT_HLIST_HEAD(&hash->table[i]);
+}
+
+/* free only the hashtable and the hash itself. */
+void hash_destroy(struct hashtable_t *hash)
+{
+	kfree(hash->table);
+	kfree(hash);
+}
+
+/* allocates and clears the hash */
+struct hashtable_t *hash_new(int size)
+{
+	struct hashtable_t *hash;
+
+	hash = kmalloc(sizeof(struct hashtable_t) , GFP_ATOMIC);
+
+	if (!hash)
+		return NULL;
+
+	hash->size = size;
+	hash->table = kmalloc(sizeof(struct element_t *) * size, GFP_ATOMIC);
+
+	if (!hash->table) {
+		kfree(hash);
+		return NULL;
+	}
+
+	hash_init(hash);
+
+	return hash;
+}

net/batman-adv/hash.h

+/*
+ * Copyright (C) 2006-2010 B.A.T.M.A.N. contributors:
+ *
+ * Simon Wunderlich, Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_HASH_H_
+#define _NET_BATMAN_ADV_HASH_H_
+
+#include <linux/list.h>
+
+/* callback to a compare function.  should
+ * compare 2 element datas for their keys,
+ * return 0 if same and not 0 if not
+ * same */
+typedef int (*hashdata_compare_cb)(void *, void *);
+
+/* the hashfunction, should return an index
+ * based on the key in the data of the first
+ * argument and the size the second */
+typedef int (*hashdata_choose_cb)(void *, int);
+typedef void (*hashdata_free_cb)(void *, void *);
+
+struct element_t {
+	void *data;		/* pointer to the data */
+	struct hlist_node hlist;	/* bucket list pointer */
+};
+
+struct hashtable_t {
+	struct hlist_head *table;   /* the hashtable itself, with the buckets */
+	int size;		    /* size of hashtable */
+};
+
+/* allocates and clears the hash */
+struct hashtable_t *hash_new(int size);
+
+/* remove element if you already found the element you want to delete and don't
+ * need the overhead to find it again with hash_remove().  But usually, you
+ * don't want to use this function, as it fiddles with hash-internals. */
+void *hash_remove_element(struct hashtable_t *hash, struct element_t *elem);
+
+/* free only the hashtable and the hash itself. */
+void hash_destroy(struct hashtable_t *hash);
+
+/* remove the hash structure. if hashdata_free_cb != NULL, this function will be
+ * called to remove the elements inside of the hash.  if you don't remove the
+ * elements, memory might be leaked. */
+static inline void hash_delete(struct hashtable_t *hash,
+			       hashdata_free_cb free_cb, void *arg)
+{
+	struct hlist_head *head;
+	struct hlist_node *walk, *safe;
+	struct element_t *bucket;
+	int i;
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_safe(walk, safe, head) {
+			bucket = hlist_entry(walk, struct element_t, hlist);
+			if (free_cb)
+				free_cb(bucket->data, arg);
+
+			hlist_del(walk);
+			kfree(bucket);
+		}
+	}
+
+	hash_destroy(hash);
+}
+
+/* adds data to the hashtable. returns 0 on success, -1 on error */
+static inline int hash_add(struct hashtable_t *hash,
+			   hashdata_compare_cb compare,
+			   hashdata_choose_cb choose, void *data)
+{
+	int index;
+	struct hlist_head *head;
+	struct hlist_node *walk, *safe;
+	struct element_t *bucket;
+
+	if (!hash)
+		return -1;
+
+	index = choose(data, hash->size);
+	head = &hash->table[index];
+
+	hlist_for_each_safe(walk, safe, head) {
+		bucket = hlist_entry(walk, struct element_t, hlist);
+		if (compare(bucket->data, data))
+			return -1;
+	}
+
+	/* no duplicate found in list, add new element */
+	bucket = kmalloc(sizeof(struct element_t), GFP_ATOMIC);
+
+	if (!bucket)
+		return -1;
+
+	bucket->data = data;
+	hlist_add_head(&bucket->hlist, head);
+
+	return 0;
+}
+
+/* removes data from hash, if found. returns pointer do data on success, so you
+ * can remove the used structure yourself, or NULL on error .  data could be the
+ * structure you use with just the key filled, we just need the key for
+ * comparing. */
+static inline void *hash_remove(struct hashtable_t *hash,
+				hashdata_compare_cb compare,
+				hashdata_choose_cb choose, void *data)
+{
+	size_t index;
+	struct hlist_node *walk;
+	struct element_t *bucket;
+	struct hlist_head *head;
+	void *data_save;
+
+	index = choose(data, hash->size);
+	head = &hash->table[index];
+
+	hlist_for_each_entry(bucket, walk, head, hlist) {
+		if (compare(bucket->data, data)) {
+			data_save = bucket->data;
+			hlist_del(walk);
+			kfree(bucket);
+			return data_save;
+		}
+	}
+
+	return NULL;
+}
+
+/* finds data, based on the key in keydata. returns the found data on success,
+ * or NULL on error */
+static inline void *hash_find(struct hashtable_t *hash,
+			      hashdata_compare_cb compare,
+			      hashdata_choose_cb choose, void *keydata)
+{
+	int index;
+	struct hlist_head *head;
+	struct hlist_node *walk;
+	struct element_t *bucket;
+
+	if (!hash)
+		return NULL;
+
+	index = choose(keydata , hash->size);
+	head = &hash->table[index];
+
+	hlist_for_each(walk, head) {
+		bucket = hlist_entry(walk, struct element_t, hlist);
+		if (compare(bucket->data, keydata))
+			return bucket->data;
+	}
+
+	return NULL;
+}
+
+#endif /* _NET_BATMAN_ADV_HASH_H_ */

net/batman-adv/icmp_socket.c

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include <linux/debugfs.h>
+#include <linux/slab.h>
+#include "icmp_socket.h"
+#include "send.h"
+#include "types.h"
+#include "hash.h"
+#include "originator.h"
+#include "hard-interface.h"
+
+static struct socket_client *socket_client_hash[256];
+
+static void bat_socket_add_packet(struct socket_client *socket_client,
+				  struct icmp_packet_rr *icmp_packet,
+				  size_t icmp_len);
+
+void bat_socket_init(void)
+{
+	memset(socket_client_hash, 0, sizeof(socket_client_hash));
+}
+
+static int bat_socket_open(struct inode *inode, struct file *file)
+{
+	unsigned int i;
+	struct socket_client *socket_client;
+
+	nonseekable_open(inode, file);
+
+	socket_client = kmalloc(sizeof(struct socket_client), GFP_KERNEL);
+
+	if (!socket_client)
+		return -ENOMEM;
+
+	for (i = 0; i < ARRAY_SIZE(socket_client_hash); i++) {
+		if (!socket_client_hash[i]) {
+			socket_client_hash[i] = socket_client;
+			break;
+		}
+	}
+
+	if (i == ARRAY_SIZE(socket_client_hash)) {
+		pr_err("Error - can't add another packet client: "
+		       "maximum number of clients reached\n");
+		kfree(socket_client);
+		return -EXFULL;
+	}
+
+	INIT_LIST_HEAD(&socket_client->queue_list);
+	socket_client->queue_len = 0;
+	socket_client->index = i;
+	socket_client->bat_priv = inode->i_private;
+	spin_lock_init(&socket_client->lock);
+	init_waitqueue_head(&socket_client->queue_wait);
+
+	file->private_data = socket_client;
+
+	inc_module_count();
+	return 0;
+}
+
+static int bat_socket_release(struct inode *inode, struct file *file)
+{
+	struct socket_client *socket_client = file->private_data;
+	struct socket_packet *socket_packet;
+	struct list_head *list_pos, *list_pos_tmp;
+
+	spin_lock_bh(&socket_client->lock);
+
+	/* for all packets in the queue ... */
+	list_for_each_safe(list_pos, list_pos_tmp, &socket_client->queue_list) {
+		socket_packet = list_entry(list_pos,
+					   struct socket_packet, list);
+
+		list_del(list_pos);
+		kfree(socket_packet);
+	}
+
+	socket_client_hash[socket_client->index] = NULL;
+	spin_unlock_bh(&socket_client->lock);
+
+	kfree(socket_client);
+	dec_module_count();
+
+	return 0;
+}
+
+static ssize_t bat_socket_read(struct file *file, char __user *buf,
+			       size_t count, loff_t *ppos)
+{
+	struct socket_client *socket_client = file->private_data;
+	struct socket_packet *socket_packet;
+	size_t packet_len;
+	int error;
+
+	if ((file->f_flags & O_NONBLOCK) && (socket_client->queue_len == 0))
+		return -EAGAIN;
+
+	if ((!buf) || (count < sizeof(struct icmp_packet)))
+		return -EINVAL;
+
+	if (!access_ok(VERIFY_WRITE, buf, count))
+		return -EFAULT;
+
+	error = wait_event_interruptible(socket_client->queue_wait,
+					 socket_client->queue_len);
+
+	if (error)
+		return error;
+
+	spin_lock_bh(&socket_client->lock);
+
+	socket_packet = list_first_entry(&socket_client->queue_list,
+					 struct socket_packet, list);
+	list_del(&socket_packet->list);
+	socket_client->queue_len--;
+
+	spin_unlock_bh(&socket_client->lock);
+
+	error = __copy_to_user(buf, &socket_packet->icmp_packet,
+			       socket_packet->icmp_len);
+
+	packet_len = socket_packet->icmp_len;
+	kfree(socket_packet);
+
+	if (error)
+		return -EFAULT;
+
+	return packet_len;
+}
+
+static ssize_t bat_socket_write(struct file *file, const char __user *buff,
+				size_t len, loff_t *off)
+{
+	struct socket_client *socket_client = file->private_data;
+	struct bat_priv *bat_priv = socket_client->bat_priv;
+	struct sk_buff *skb;
+	struct icmp_packet_rr *icmp_packet;
+
+	struct orig_node *orig_node;
+	struct batman_if *batman_if;
+	size_t packet_len = sizeof(struct icmp_packet);
+	uint8_t dstaddr[ETH_ALEN];
+
+	if (len < sizeof(struct icmp_packet)) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Error - can't send packet from char device: "
+			"invalid packet size\n");
+		return -EINVAL;
+	}
+
+	if (!bat_priv->primary_if)
+		return -EFAULT;
+
+	if (len >= sizeof(struct icmp_packet_rr))
+		packet_len = sizeof(struct icmp_packet_rr);
+
+	skb = dev_alloc_skb(packet_len + sizeof(struct ethhdr));
+	if (!skb)
+		return -ENOMEM;
+
+	skb_reserve(skb, sizeof(struct ethhdr));
+	icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len);
+
+	if (!access_ok(VERIFY_READ, buff, packet_len)) {
+		len = -EFAULT;
+		goto free_skb;
+	}
+
+	if (__copy_from_user(icmp_packet, buff, packet_len)) {
+		len = -EFAULT;
+		goto free_skb;
+	}
+
+	if (icmp_packet->packet_type != BAT_ICMP) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Error - can't send packet from char device: "
+			"got bogus packet type (expected: BAT_ICMP)\n");
+		len = -EINVAL;
+		goto free_skb;
+	}
+
+	if (icmp_packet->msg_type != ECHO_REQUEST) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Error - can't send packet from char device: "
+			"got bogus message type (expected: ECHO_REQUEST)\n");
+		len = -EINVAL;
+		goto free_skb;
+	}
+
+	icmp_packet->uid = socket_client->index;
+
+	if (icmp_packet->version != COMPAT_VERSION) {
+		icmp_packet->msg_type = PARAMETER_PROBLEM;
+		icmp_packet->ttl = COMPAT_VERSION;
+		bat_socket_add_packet(socket_client, icmp_packet, packet_len);
+		goto free_skb;
+	}
+
+	if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
+		goto dst_unreach;
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
+						   compare_orig, choose_orig,
+						   icmp_packet->dst));
+
+	if (!orig_node)
+		goto unlock;
+
+	if (!orig_node->router)
+		goto unlock;
+
+	batman_if = orig_node->router->if_incoming;
+	memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
+
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	if (!batman_if)
+		goto dst_unreach;
+
+	if (batman_if->if_status != IF_ACTIVE)
+		goto dst_unreach;
+
+	memcpy(icmp_packet->orig,
+	       bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+
+	if (packet_len == sizeof(struct icmp_packet_rr))
+		memcpy(icmp_packet->rr, batman_if->net_dev->dev_addr, ETH_ALEN);
+
+
+	send_skb_packet(skb, batman_if, dstaddr);
+
+	goto out;
+
+unlock:
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+dst_unreach:
+	icmp_packet->msg_type = DESTINATION_UNREACHABLE;
+	bat_socket_add_packet(socket_client, icmp_packet, packet_len);
+free_skb:
+	kfree_skb(skb);
+out:
+	return len;
+}
+
+static unsigned int bat_socket_poll(struct file *file, poll_table *wait)
+{
+	struct socket_client *socket_client = file->private_data;
+
+	poll_wait(file, &socket_client->queue_wait, wait);
+
+	if (socket_client->queue_len > 0)
+		return POLLIN | POLLRDNORM;
+
+	return 0;
+}
+
+static const struct file_operations fops = {
+	.owner = THIS_MODULE,
+	.open = bat_socket_open,
+	.release = bat_socket_release,
+	.read = bat_socket_read,
+	.write = bat_socket_write,
+	.poll = bat_socket_poll,
+	.llseek = no_llseek,
+};
+
+int bat_socket_setup(struct bat_priv *bat_priv)
+{
+	struct dentry *d;
+
+	if (!bat_priv->debug_dir)
+		goto err;
+
+	d = debugfs_create_file(ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR,
+				bat_priv->debug_dir, bat_priv, &fops);
+	if (d)
+		goto err;
+
+	return 0;
+
+err:
+	return 1;
+}
+
+static void bat_socket_add_packet(struct socket_client *socket_client,
+				  struct icmp_packet_rr *icmp_packet,
+				  size_t icmp_len)
+{
+	struct socket_packet *socket_packet;
+
+	socket_packet = kmalloc(sizeof(struct socket_packet), GFP_ATOMIC);
+
+	if (!socket_packet)
+		return;
+
+	INIT_LIST_HEAD(&socket_packet->list);
+	memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len);
+	socket_packet->icmp_len = icmp_len;
+
+	spin_lock_bh(&socket_client->lock);
+
+	/* while waiting for the lock the socket_client could have been
+	 * deleted */
+	if (!socket_client_hash[icmp_packet->uid]) {
+		spin_unlock_bh(&socket_client->lock);
+		kfree(socket_packet);
+		return;
+	}
+
+	list_add_tail(&socket_packet->list, &socket_client->queue_list);
+	socket_client->queue_len++;
+
+	if (socket_client->queue_len > 100) {
+		socket_packet = list_first_entry(&socket_client->queue_list,
+						 struct socket_packet, list);
+
+		list_del(&socket_packet->list);
+		kfree(socket_packet);
+		socket_client->queue_len--;
+	}
+
+	spin_unlock_bh(&socket_client->lock);
+
+	wake_up(&socket_client->queue_wait);
+}
+
+void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet,
+			       size_t icmp_len)
+{
+	struct socket_client *hash = socket_client_hash[icmp_packet->uid];
+
+	if (hash)
+		bat_socket_add_packet(hash, icmp_packet, icmp_len);
+}

net/batman-adv/icmp_socket.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_ICMP_SOCKET_H_
+#define _NET_BATMAN_ADV_ICMP_SOCKET_H_
+
+#include "types.h"
+
+#define ICMP_SOCKET "socket"
+
+void bat_socket_init(void);
+int bat_socket_setup(struct bat_priv *bat_priv);
+void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet,
+			       size_t icmp_len);
+
+#endif /* _NET_BATMAN_ADV_ICMP_SOCKET_H_ */

net/batman-adv/main.c

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "bat_sysfs.h"
+#include "bat_debugfs.h"
+#include "routing.h"
+#include "send.h"
+#include "originator.h"
+#include "soft-interface.h"
+#include "icmp_socket.h"
+#include "translation-table.h"
+#include "hard-interface.h"
+#include "gateway_client.h"
+#include "types.h"
+#include "vis.h"
+#include "hash.h"
+
+struct list_head if_list;
+
+unsigned char broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+
+struct workqueue_struct *bat_event_workqueue;
+
+static int __init batman_init(void)
+{
+	INIT_LIST_HEAD(&if_list);
+
+	/* the name should not be longer than 10 chars - see
+	 * http://lwn.net/Articles/23634/ */
+	bat_event_workqueue = create_singlethread_workqueue("bat_events");
+
+	if (!bat_event_workqueue)
+		return -ENOMEM;
+
+	bat_socket_init();
+	debugfs_init();
+
+	register_netdevice_notifier(&hard_if_notifier);
+
+	pr_info("B.A.T.M.A.N. advanced %s%s (compatibility version %i) "
+		"loaded\n", SOURCE_VERSION, REVISION_VERSION_STR,
+		COMPAT_VERSION);
+
+	return 0;
+}
+
+static void __exit batman_exit(void)
+{
+	debugfs_destroy();
+	unregister_netdevice_notifier(&hard_if_notifier);
+	hardif_remove_interfaces();
+
+	flush_workqueue(bat_event_workqueue);
+	destroy_workqueue(bat_event_workqueue);
+	bat_event_workqueue = NULL;
+
+	rcu_barrier();
+}
+
+int mesh_init(struct net_device *soft_iface)
+{
+	struct bat_priv *bat_priv = netdev_priv(soft_iface);
+
+	spin_lock_init(&bat_priv->orig_hash_lock);
+	spin_lock_init(&bat_priv->forw_bat_list_lock);
+	spin_lock_init(&bat_priv->forw_bcast_list_lock);
+	spin_lock_init(&bat_priv->hna_lhash_lock);
+	spin_lock_init(&bat_priv->hna_ghash_lock);
+	spin_lock_init(&bat_priv->gw_list_lock);
+	spin_lock_init(&bat_priv->vis_hash_lock);
+	spin_lock_init(&bat_priv->vis_list_lock);
+	spin_lock_init(&bat_priv->softif_neigh_lock);
+
+	INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
+	INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
+	INIT_HLIST_HEAD(&bat_priv->gw_list);
+	INIT_HLIST_HEAD(&bat_priv->softif_neigh_list);
+
+	if (originator_init(bat_priv) < 1)
+		goto err;
+
+	if (hna_local_init(bat_priv) < 1)
+		goto err;
+
+	if (hna_global_init(bat_priv) < 1)
+		goto err;
+
+	hna_local_add(soft_iface, soft_iface->dev_addr);
+
+	if (vis_init(bat_priv) < 1)
+		goto err;
+
+	atomic_set(&bat_priv->mesh_state, MESH_ACTIVE);
+	goto end;
+
+err:
+	pr_err("Unable to allocate memory for mesh information structures: "
+	       "out of mem ?\n");
+	mesh_free(soft_iface);
+	return -1;
+
+end:
+	return 0;
+}
+
+void mesh_free(struct net_device *soft_iface)
+{
+	struct bat_priv *bat_priv = netdev_priv(soft_iface);
+
+	atomic_set(&bat_priv->mesh_state, MESH_DEACTIVATING);
+
+	purge_outstanding_packets(bat_priv, NULL);
+
+	vis_quit(bat_priv);
+
+	gw_node_purge(bat_priv);
+	originator_free(bat_priv);
+
+	hna_local_free(bat_priv);
+	hna_global_free(bat_priv);
+
+	softif_neigh_purge(bat_priv);
+
+	atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
+}
+
+void inc_module_count(void)
+{
+	try_module_get(THIS_MODULE);
+}
+
+void dec_module_count(void)
+{
+	module_put(THIS_MODULE);
+}
+
+int is_my_mac(uint8_t *addr)
+{
+	struct batman_if *batman_if;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(batman_if, &if_list, list) {
+		if (batman_if->if_status != IF_ACTIVE)
+			continue;
+
+		if (compare_orig(batman_if->net_dev->dev_addr, addr)) {
+			rcu_read_unlock();
+			return 1;
+		}
+	}
+	rcu_read_unlock();
+	return 0;
+
+}
+
+module_init(batman_init);
+module_exit(batman_exit);
+
+MODULE_LICENSE("GPL");
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE);
+#ifdef REVISION_VERSION
+MODULE_VERSION(SOURCE_VERSION "-" REVISION_VERSION);
+#else
+MODULE_VERSION(SOURCE_VERSION);
+#endif

net/batman-adv/main.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_MAIN_H_
+#define _NET_BATMAN_ADV_MAIN_H_
+
+/* Kernel Programming */
+#define LINUX
+
+#define DRIVER_AUTHOR "Marek Lindner <lindner_marek@yahoo.de>, " \
+		      "Simon Wunderlich <siwu@hrz.tu-chemnitz.de>"
+#define DRIVER_DESC   "B.A.T.M.A.N. advanced"
+#define DRIVER_DEVICE "batman-adv"
+
+#define SOURCE_VERSION "next"
+
+
+/* B.A.T.M.A.N. parameters */
+
+#define TQ_MAX_VALUE 255
+#define JITTER 20
+#define TTL 50			  /* Time To Live of broadcast messages */
+
+#define PURGE_TIMEOUT 200	/* purge originators after time in seconds if no
+				   * valid packet comes in -> TODO: check
+				   * influence on TQ_LOCAL_WINDOW_SIZE */
+#define LOCAL_HNA_TIMEOUT 3600 /* in seconds */
+
+#define TQ_LOCAL_WINDOW_SIZE 64	  /* sliding packet range of received originator
+				   * messages in squence numbers (should be a
+				   * multiple of our word size) */
+#define TQ_GLOBAL_WINDOW_SIZE 5
+#define TQ_LOCAL_BIDRECT_SEND_MINIMUM 1
+#define TQ_LOCAL_BIDRECT_RECV_MINIMUM 1
+#define TQ_TOTAL_BIDRECT_LIMIT 1
+
+#define NUM_WORDS (TQ_LOCAL_WINDOW_SIZE / WORD_BIT_SIZE)
+
+#define PACKBUFF_SIZE 2000
+#define LOG_BUF_LEN 8192	  /* has to be a power of 2 */
+
+#define VIS_INTERVAL 5000	/* 5 seconds */
+
+/* how much worse secondary interfaces may be to
+ * to be considered as bonding candidates */
+
+#define BONDING_TQ_THRESHOLD	50
+
+#define MAX_AGGREGATION_BYTES 512 /* should not be bigger than 512 bytes or
+				   * change the size of
+				   * forw_packet->direct_link_flags */
+#define MAX_AGGREGATION_MS 100
+
+#define SOFTIF_NEIGH_TIMEOUT 180000 /* 3 minutes */
+
+#define RESET_PROTECTION_MS 30000
+#define EXPECTED_SEQNO_RANGE	65536
+/* don't reset again within 30 seconds */
+
+#define MESH_INACTIVE 0
+#define MESH_ACTIVE 1
+#define MESH_DEACTIVATING 2
+
+#define BCAST_QUEUE_LEN		256
+#define BATMAN_QUEUE_LEN	256
+
+/*
+ * Debug Messages
+ */
+#ifdef pr_fmt
+#undef pr_fmt
+#endif
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt /* Append 'batman-adv: ' before
+					     * kernel messages */
+
+#define DBG_BATMAN 1	/* all messages related to routing / flooding /
+			 * broadcasting / etc */
+#define DBG_ROUTES 2	/* route or hna added / changed / deleted */
+#define DBG_ALL 3
+
+#define LOG_BUF_LEN 8192          /* has to be a power of 2 */
+
+
+/*
+ *  Vis
+ */
+
+/* #define VIS_SUBCLUSTERS_DISABLED */
+
+/*
+ * Kernel headers
+ */
+
+#include <linux/mutex.h>	/* mutex */
+#include <linux/module.h>	/* needed by all modules */
+#include <linux/netdevice.h>	/* netdevice */
+#include <linux/etherdevice.h>  /* ethernet address classifaction */
+#include <linux/if_ether.h>	/* ethernet header */
+#include <linux/poll.h>		/* poll_table */
+#include <linux/kthread.h>	/* kernel threads */
+#include <linux/pkt_sched.h>	/* schedule types */
+#include <linux/workqueue.h>	/* workqueue */
+#include <linux/slab.h>
+#include <net/sock.h>		/* struct sock */
+#include <linux/jiffies.h>
+#include <linux/seq_file.h>
+#include "types.h"
+
+#ifndef REVISION_VERSION
+#define REVISION_VERSION_STR ""
+#else
+#define REVISION_VERSION_STR " "REVISION_VERSION
+#endif
+
+extern struct list_head if_list;
+
+extern unsigned char broadcast_addr[];
+extern struct workqueue_struct *bat_event_workqueue;
+
+int mesh_init(struct net_device *soft_iface);
+void mesh_free(struct net_device *soft_iface);
+void inc_module_count(void);
+void dec_module_count(void);
+int is_my_mac(uint8_t *addr);
+
+#ifdef CONFIG_BATMAN_ADV_DEBUG
+int debug_log(struct bat_priv *bat_priv, char *fmt, ...);
+
+#define bat_dbg(type, bat_priv, fmt, arg...)			\
+	do {							\
+		if (atomic_read(&bat_priv->log_level) & type)	\
+			debug_log(bat_priv, fmt, ## arg);	\
+	}							\
+	while (0)
+#else /* !CONFIG_BATMAN_ADV_DEBUG */
+static inline void bat_dbg(char type __attribute__((unused)),
+			   struct bat_priv *bat_priv __attribute__((unused)),
+			   char *fmt __attribute__((unused)), ...)
+{
+}
+#endif
+
+#define bat_warning(net_dev, fmt, arg...)				\
+	do {								\
+		struct net_device *_netdev = (net_dev);                 \
+		struct bat_priv *_batpriv = netdev_priv(_netdev);       \
+		bat_dbg(DBG_ALL, _batpriv, fmt, ## arg);		\
+		pr_warning("%s: " fmt, _netdev->name, ## arg);		\
+	} while (0)
+#define bat_info(net_dev, fmt, arg...)					\
+	do {								\
+		struct net_device *_netdev = (net_dev);                 \
+		struct bat_priv *_batpriv = netdev_priv(_netdev);       \
+		bat_dbg(DBG_ALL, _batpriv, fmt, ## arg);		\
+		pr_info("%s: " fmt, _netdev->name, ## arg);		\
+	} while (0)
+#define bat_err(net_dev, fmt, arg...)					\
+	do {								\
+		struct net_device *_netdev = (net_dev);                 \
+		struct bat_priv *_batpriv = netdev_priv(_netdev);       \
+		bat_dbg(DBG_ALL, _batpriv, fmt, ## arg);		\
+		pr_err("%s: " fmt, _netdev->name, ## arg);		\
+	} while (0)
+
+#endif /* _NET_BATMAN_ADV_MAIN_H_ */

net/batman-adv/originator.c

+/*
+ * Copyright (C) 2009-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+/* increase the reference counter for this originator */
+
+#include "main.h"
+#include "originator.h"
+#include "hash.h"
+#include "translation-table.h"
+#include "routing.h"
+#include "gateway_client.h"
+#include "hard-interface.h"
+#include "unicast.h"
+#include "soft-interface.h"
+
+static void purge_orig(struct work_struct *work);
+
+static void start_purge_timer(struct bat_priv *bat_priv)
+{
+	INIT_DELAYED_WORK(&bat_priv->orig_work, purge_orig);
+	queue_delayed_work(bat_event_workqueue, &bat_priv->orig_work, 1 * HZ);
+}
+
+int originator_init(struct bat_priv *bat_priv)
+{
+	if (bat_priv->orig_hash)
+		return 1;
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	bat_priv->orig_hash = hash_new(1024);
+
+	if (!bat_priv->orig_hash)
+		goto err;
+
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+	start_purge_timer(bat_priv);
+	return 1;
+
+err:
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+	return 0;
+}
+
+struct neigh_node *
+create_neighbor(struct orig_node *orig_node, struct orig_node *orig_neigh_node,
+		uint8_t *neigh, struct batman_if *if_incoming)
+{
+	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
+	struct neigh_node *neigh_node;
+
+	bat_dbg(DBG_BATMAN, bat_priv,
+		"Creating new last-hop neighbor of originator\n");
+
+	neigh_node = kzalloc(sizeof(struct neigh_node), GFP_ATOMIC);
+	if (!neigh_node)
+		return NULL;
+
+	INIT_LIST_HEAD(&neigh_node->list);
+
+	memcpy(neigh_node->addr, neigh, ETH_ALEN);
+	neigh_node->orig_node = orig_neigh_node;
+	neigh_node->if_incoming = if_incoming;
+
+	list_add_tail(&neigh_node->list, &orig_node->neigh_list);
+	return neigh_node;
+}
+
+static void free_orig_node(void *data, void *arg)
+{
+	struct list_head *list_pos, *list_pos_tmp;
+	struct neigh_node *neigh_node;
+	struct orig_node *orig_node = (struct orig_node *)data;
+	struct bat_priv *bat_priv = (struct bat_priv *)arg;
+
+	/* for all neighbors towards this originator ... */
+	list_for_each_safe(list_pos, list_pos_tmp, &orig_node->neigh_list) {
+		neigh_node = list_entry(list_pos, struct neigh_node, list);
+
+		list_del(list_pos);
+		kfree(neigh_node);
+	}
+
+	frag_list_free(&orig_node->frag_list);
+	hna_global_del_orig(bat_priv, orig_node, "originator timed out");
+
+	kfree(orig_node->bcast_own);
+	kfree(orig_node->bcast_own_sum);
+	kfree(orig_node);
+}
+
+void originator_free(struct bat_priv *bat_priv)
+{
+	if (!bat_priv->orig_hash)
+		return;
+
+	cancel_delayed_work_sync(&bat_priv->orig_work);
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	hash_delete(bat_priv->orig_hash, free_orig_node, bat_priv);
+	bat_priv->orig_hash = NULL;
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+}
+
+/* this function finds or creates an originator entry for the given
+ * address if it does not exits */
+struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr)
+{
+	struct orig_node *orig_node;
+	int size;
+	int hash_added;
+
+	orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
+						   compare_orig, choose_orig,
+						   addr));
+
+	if (orig_node)
+		return orig_node;
+
+	bat_dbg(DBG_BATMAN, bat_priv,
+		"Creating new originator: %pM\n", addr);
+
+	orig_node = kzalloc(sizeof(struct orig_node), GFP_ATOMIC);
+	if (!orig_node)
+		return NULL;
+
+	INIT_LIST_HEAD(&orig_node->neigh_list);
+
+	memcpy(orig_node->orig, addr, ETH_ALEN);
+	orig_node->router = NULL;
+	orig_node->hna_buff = NULL;
+	orig_node->bcast_seqno_reset = jiffies - 1
+					- msecs_to_jiffies(RESET_PROTECTION_MS);
+	orig_node->batman_seqno_reset = jiffies - 1
+					- msecs_to_jiffies(RESET_PROTECTION_MS);
+
+	size = bat_priv->num_ifaces * sizeof(unsigned long) * NUM_WORDS;
+
+	orig_node->bcast_own = kzalloc(size, GFP_ATOMIC);
+	if (!orig_node->bcast_own)
+		goto free_orig_node;
+
+	size = bat_priv->num_ifaces * sizeof(uint8_t);
+	orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC);
+
+	INIT_LIST_HEAD(&orig_node->frag_list);
+	orig_node->last_frag_packet = 0;
+
+	if (!orig_node->bcast_own_sum)
+		goto free_bcast_own;
+
+	hash_added = hash_add(bat_priv->orig_hash, compare_orig, choose_orig,
+			      orig_node);
+	if (hash_added < 0)
+		goto free_bcast_own_sum;
+
+	return orig_node;
+free_bcast_own_sum:
+	kfree(orig_node->bcast_own_sum);
+free_bcast_own:
+	kfree(orig_node->bcast_own);
+free_orig_node:
+	kfree(orig_node);
+	return NULL;
+}
+
+static bool purge_orig_neighbors(struct bat_priv *bat_priv,
+				 struct orig_node *orig_node,
+				 struct neigh_node **best_neigh_node)
+{
+	struct list_head *list_pos, *list_pos_tmp;
+	struct neigh_node *neigh_node;
+	bool neigh_purged = false;
+
+	*best_neigh_node = NULL;
+
+	/* for all neighbors towards this originator ... */
+	list_for_each_safe(list_pos, list_pos_tmp, &orig_node->neigh_list) {
+		neigh_node = list_entry(list_pos, struct neigh_node, list);
+
+		if ((time_after(jiffies,
+			neigh_node->last_valid + PURGE_TIMEOUT * HZ)) ||
+		    (neigh_node->if_incoming->if_status == IF_INACTIVE) ||
+		    (neigh_node->if_incoming->if_status == IF_TO_BE_REMOVED)) {
+
+			if (neigh_node->if_incoming->if_status ==
+							IF_TO_BE_REMOVED)
+				bat_dbg(DBG_BATMAN, bat_priv,
+					"neighbor purge: originator %pM, "
+					"neighbor: %pM, iface: %s\n",
+					orig_node->orig, neigh_node->addr,
+					neigh_node->if_incoming->net_dev->name);
+			else
+				bat_dbg(DBG_BATMAN, bat_priv,
+					"neighbor timeout: originator %pM, "
+					"neighbor: %pM, last_valid: %lu\n",
+					orig_node->orig, neigh_node->addr,
+					(neigh_node->last_valid / HZ));
+
+			neigh_purged = true;
+			list_del(list_pos);
+			kfree(neigh_node);
+		} else {
+			if ((!*best_neigh_node) ||
+			    (neigh_node->tq_avg > (*best_neigh_node)->tq_avg))
+				*best_neigh_node = neigh_node;
+		}
+	}
+	return neigh_purged;
+}
+
+static bool purge_orig_node(struct bat_priv *bat_priv,
+			    struct orig_node *orig_node)
+{
+	struct neigh_node *best_neigh_node;
+
+	if (time_after(jiffies,
+		orig_node->last_valid + 2 * PURGE_TIMEOUT * HZ)) {
+
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Originator timeout: originator %pM, last_valid %lu\n",
+			orig_node->orig, (orig_node->last_valid / HZ));
+		return true;
+	} else {
+		if (purge_orig_neighbors(bat_priv, orig_node,
+							&best_neigh_node)) {
+			update_routes(bat_priv, orig_node,
+				      best_neigh_node,
+				      orig_node->hna_buff,
+				      orig_node->hna_buff_len);
+			/* update bonding candidates, we could have lost
+			 * some candidates. */
+			update_bonding_candidates(bat_priv, orig_node);
+		}
+	}
+
+	return false;
+}
+
+static void _purge_orig(struct bat_priv *bat_priv)
+{
+	struct hashtable_t *hash = bat_priv->orig_hash;
+	struct hlist_node *walk, *safe;
+	struct hlist_head *head;
+	struct element_t *bucket;
+	struct orig_node *orig_node;
+	int i;
+
+	if (!hash)
+		return;
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+
+	/* for all origins... */
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry_safe(bucket, walk, safe, head, hlist) {
+			orig_node = bucket->data;
+
+			if (purge_orig_node(bat_priv, orig_node)) {
+				if (orig_node->gw_flags)
+					gw_node_delete(bat_priv, orig_node);
+				hlist_del(walk);
+				kfree(bucket);
+				free_orig_node(orig_node, bat_priv);
+			}
+
+			if (time_after(jiffies, orig_node->last_frag_packet +
+						msecs_to_jiffies(FRAG_TIMEOUT)))
+				frag_list_free(&orig_node->frag_list);
+		}
+	}
+
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	gw_node_purge(bat_priv);
+	gw_election(bat_priv);
+
+	softif_neigh_purge(bat_priv);
+}
+
+static void purge_orig(struct work_struct *work)
+{
+	struct delayed_work *delayed_work =
+		container_of(work, struct delayed_work, work);
+	struct bat_priv *bat_priv =
+		container_of(delayed_work, struct bat_priv, orig_work);
+
+	_purge_orig(bat_priv);
+	start_purge_timer(bat_priv);
+}
+
+void purge_orig_ref(struct bat_priv *bat_priv)
+{
+	_purge_orig(bat_priv);
+}
+
+int orig_seq_print_text(struct seq_file *seq, void *offset)
+{
+	struct net_device *net_dev = (struct net_device *)seq->private;
+	struct bat_priv *bat_priv = netdev_priv(net_dev);
+	struct hashtable_t *hash = bat_priv->orig_hash;
+	struct hlist_node *walk;
+	struct hlist_head *head;
+	struct element_t *bucket;
+	struct orig_node *orig_node;
+	struct neigh_node *neigh_node;
+	int batman_count = 0;
+	int last_seen_secs;
+	int last_seen_msecs;
+	int i;
+
+	if ((!bat_priv->primary_if) ||
+	    (bat_priv->primary_if->if_status != IF_ACTIVE)) {
+		if (!bat_priv->primary_if)
+			return seq_printf(seq, "BATMAN mesh %s disabled - "
+				     "please specify interfaces to enable it\n",
+				     net_dev->name);
+
+		return seq_printf(seq, "BATMAN mesh %s "
+				  "disabled - primary interface not active\n",
+				  net_dev->name);
+	}
+
+	seq_printf(seq, "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n",
+		   SOURCE_VERSION, REVISION_VERSION_STR,
+		   bat_priv->primary_if->net_dev->name,
+		   bat_priv->primary_if->net_dev->dev_addr, net_dev->name);
+	seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
+		   "Originator", "last-seen", "#", TQ_MAX_VALUE, "Nexthop",
+		   "outgoingIF", "Potential nexthops");
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry(bucket, walk, head, hlist) {
+			orig_node = bucket->data;
+
+			if (!orig_node->router)
+				continue;
+
+			if (orig_node->router->tq_avg == 0)
+				continue;
+
+			last_seen_secs = jiffies_to_msecs(jiffies -
+						orig_node->last_valid) / 1000;
+			last_seen_msecs = jiffies_to_msecs(jiffies -
+						orig_node->last_valid) % 1000;
+
+			neigh_node = orig_node->router;
+			seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
+				   orig_node->orig, last_seen_secs,
+				   last_seen_msecs, neigh_node->tq_avg,
+				   neigh_node->addr,
+				   neigh_node->if_incoming->net_dev->name);
+
+			list_for_each_entry(neigh_node, &orig_node->neigh_list,
+					    list) {
+				seq_printf(seq, " %pM (%3i)", neigh_node->addr,
+						neigh_node->tq_avg);
+			}
+
+			seq_printf(seq, "\n");
+			batman_count++;
+		}
+	}
+
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	if ((batman_count == 0))
+		seq_printf(seq, "No batman nodes in range ...\n");
+
+	return 0;
+}
+
+static int orig_node_add_if(struct orig_node *orig_node, int max_if_num)
+{
+	void *data_ptr;
+
+	data_ptr = kmalloc(max_if_num * sizeof(unsigned long) * NUM_WORDS,
+			   GFP_ATOMIC);
+	if (!data_ptr) {
+		pr_err("Can't resize orig: out of memory\n");
+		return -1;
+	}
+
+	memcpy(data_ptr, orig_node->bcast_own,
+	       (max_if_num - 1) * sizeof(unsigned long) * NUM_WORDS);
+	kfree(orig_node->bcast_own);
+	orig_node->bcast_own = data_ptr;
+
+	data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
+	if (!data_ptr) {
+		pr_err("Can't resize orig: out of memory\n");
+		return -1;
+	}
+
+	memcpy(data_ptr, orig_node->bcast_own_sum,
+	       (max_if_num - 1) * sizeof(uint8_t));
+	kfree(orig_node->bcast_own_sum);
+	orig_node->bcast_own_sum = data_ptr;
+
+	return 0;
+}
+
+int orig_hash_add_if(struct batman_if *batman_if, int max_if_num)
+{
+	struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
+	struct hashtable_t *hash = bat_priv->orig_hash;
+	struct hlist_node *walk;
+	struct hlist_head *head;
+	struct element_t *bucket;
+	struct orig_node *orig_node;
+	int i;
+
+	/* resize all orig nodes because orig_node->bcast_own(_sum) depend on
+	 * if_num */
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry(bucket, walk, head, hlist) {
+			orig_node = bucket->data;
+
+			if (orig_node_add_if(orig_node, max_if_num) == -1)
+				goto err;
+		}
+	}
+
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+	return 0;
+
+err:
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+	return -ENOMEM;
+}
+
+static int orig_node_del_if(struct orig_node *orig_node,
+		     int max_if_num, int del_if_num)
+{
+	void *data_ptr = NULL;
+	int chunk_size;
+
+	/* last interface was removed */
+	if (max_if_num == 0)
+		goto free_bcast_own;
+
+	chunk_size = sizeof(unsigned long) * NUM_WORDS;
+	data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC);
+	if (!data_ptr) {
+		pr_err("Can't resize orig: out of memory\n");
+		return -1;
+	}
+
+	/* copy first part */
+	memcpy(data_ptr, orig_node->bcast_own, del_if_num * chunk_size);
+
+	/* copy second part */
+	memcpy(data_ptr + del_if_num * chunk_size,
+	       orig_node->bcast_own + ((del_if_num + 1) * chunk_size),
+	       (max_if_num - del_if_num) * chunk_size);
+
+free_bcast_own:
+	kfree(orig_node->bcast_own);
+	orig_node->bcast_own = data_ptr;
+
+	if (max_if_num == 0)
+		goto free_own_sum;
+
+	data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
+	if (!data_ptr) {
+		pr_err("Can't resize orig: out of memory\n");
+		return -1;
+	}
+
+	memcpy(data_ptr, orig_node->bcast_own_sum,
+	       del_if_num * sizeof(uint8_t));
+
+	memcpy(data_ptr + del_if_num * sizeof(uint8_t),
+	       orig_node->bcast_own_sum + ((del_if_num + 1) * sizeof(uint8_t)),
+	       (max_if_num - del_if_num) * sizeof(uint8_t));
+
+free_own_sum:
+	kfree(orig_node->bcast_own_sum);
+	orig_node->bcast_own_sum = data_ptr;
+
+	return 0;
+}
+
+int orig_hash_del_if(struct batman_if *batman_if, int max_if_num)
+{
+	struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
+	struct hashtable_t *hash = bat_priv->orig_hash;
+	struct hlist_node *walk;
+	struct hlist_head *head;
+	struct element_t *bucket;
+	struct batman_if *batman_if_tmp;
+	struct orig_node *orig_node;
+	int i, ret;
+
+	/* resize all orig nodes because orig_node->bcast_own(_sum) depend on
+	 * if_num */
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry(bucket, walk, head, hlist) {
+			orig_node = bucket->data;
+
+			ret = orig_node_del_if(orig_node, max_if_num,
+					batman_if->if_num);
+
+			if (ret == -1)
+				goto err;
+		}
+	}
+
+	/* renumber remaining batman interfaces _inside_ of orig_hash_lock */
+	rcu_read_lock();
+	list_for_each_entry_rcu(batman_if_tmp, &if_list, list) {
+		if (batman_if_tmp->if_status == IF_NOT_IN_USE)
+			continue;
+
+		if (batman_if == batman_if_tmp)
+			continue;
+
+		if (batman_if->soft_iface != batman_if_tmp->soft_iface)
+			continue;
+
+		if (batman_if_tmp->if_num > batman_if->if_num)
+			batman_if_tmp->if_num--;
+	}
+	rcu_read_unlock();
+
+	batman_if->if_num = -1;
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+	return 0;
+
+err:
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+	return -ENOMEM;
+}

net/batman-adv/originator.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_ORIGINATOR_H_
+#define _NET_BATMAN_ADV_ORIGINATOR_H_
+
+int originator_init(struct bat_priv *bat_priv);
+void originator_free(struct bat_priv *bat_priv);
+void purge_orig_ref(struct bat_priv *bat_priv);
+struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr);
+struct neigh_node *
+create_neighbor(struct orig_node *orig_node, struct orig_node *orig_neigh_node,
+		uint8_t *neigh, struct batman_if *if_incoming);
+int orig_seq_print_text(struct seq_file *seq, void *offset);
+int orig_hash_add_if(struct batman_if *batman_if, int max_if_num);
+int orig_hash_del_if(struct batman_if *batman_if, int max_if_num);
+
+
+/* returns 1 if they are the same originator */
+static inline int compare_orig(void *data1, void *data2)
+{
+	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
+}
+
+/* hashfunction to choose an entry in a hash table of given size */
+/* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */
+static inline int choose_orig(void *data, int32_t size)
+{
+	unsigned char *key = data;
+	uint32_t hash = 0;
+	size_t i;
+
+	for (i = 0; i < 6; i++) {
+		hash += key[i];
+		hash += (hash << 10);
+		hash ^= (hash >> 6);
+	}
+
+	hash += (hash << 3);
+	hash ^= (hash >> 11);
+	hash += (hash << 15);
+
+	return hash % size;
+}
+
+#endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */

net/batman-adv/packet.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_PACKET_H_
+#define _NET_BATMAN_ADV_PACKET_H_
+
+#define ETH_P_BATMAN  0x4305	/* unofficial/not registered Ethertype */
+
+#define BAT_PACKET       0x01
+#define BAT_ICMP         0x02
+#define BAT_UNICAST      0x03
+#define BAT_BCAST        0x04
+#define BAT_VIS          0x05
+#define BAT_UNICAST_FRAG 0x06
+
+/* this file is included by batctl which needs these defines */
+#define COMPAT_VERSION 12
+#define DIRECTLINK 0x40
+#define VIS_SERVER 0x20
+#define PRIMARIES_FIRST_HOP 0x10
+
+/* ICMP message types */
+#define ECHO_REPLY 0
+#define DESTINATION_UNREACHABLE 3
+#define ECHO_REQUEST 8
+#define TTL_EXCEEDED 11
+#define PARAMETER_PROBLEM 12
+
+/* vis defines */
+#define VIS_TYPE_SERVER_SYNC		0
+#define VIS_TYPE_CLIENT_UPDATE		1
+
+/* fragmentation defines */
+#define UNI_FRAG_HEAD 0x01
+
+struct batman_packet {
+	uint8_t  packet_type;
+	uint8_t  version;  /* batman version field */
+	uint8_t  flags;    /* 0x40: DIRECTLINK flag, 0x20 VIS_SERVER flag... */
+	uint8_t  tq;
+	uint32_t seqno;
+	uint8_t  orig[6];
+	uint8_t  prev_sender[6];
+	uint8_t  ttl;
+	uint8_t  num_hna;
+	uint8_t  gw_flags;  /* flags related to gateway class */
+	uint8_t  align;
+} __attribute__((packed));
+
+#define BAT_PACKET_LEN sizeof(struct batman_packet)
+
+struct icmp_packet {
+	uint8_t  packet_type;
+	uint8_t  version;  /* batman version field */
+	uint8_t  msg_type; /* see ICMP message types above */
+	uint8_t  ttl;
+	uint8_t  dst[6];
+	uint8_t  orig[6];
+	uint16_t seqno;
+	uint8_t  uid;
+} __attribute__((packed));
+
+#define BAT_RR_LEN 16
+
+/* icmp_packet_rr must start with all fields from imcp_packet
+ * as this is assumed by code that handles ICMP packets */
+struct icmp_packet_rr {
+	uint8_t  packet_type;
+	uint8_t  version;  /* batman version field */
+	uint8_t  msg_type; /* see ICMP message types above */
+	uint8_t  ttl;
+	uint8_t  dst[6];
+	uint8_t  orig[6];
+	uint16_t seqno;
+	uint8_t  uid;
+	uint8_t  rr_cur;
+	uint8_t  rr[BAT_RR_LEN][ETH_ALEN];
+} __attribute__((packed));
+
+struct unicast_packet {
+	uint8_t  packet_type;
+	uint8_t  version;  /* batman version field */
+	uint8_t  dest[6];
+	uint8_t  ttl;
+} __attribute__((packed));
+
+struct unicast_frag_packet {
+	uint8_t  packet_type;
+	uint8_t  version;  /* batman version field */
+	uint8_t  dest[6];
+	uint8_t  ttl;
+	uint8_t  flags;
+	uint8_t  orig[6];
+	uint16_t seqno;
+} __attribute__((packed));
+
+struct bcast_packet {
+	uint8_t  packet_type;
+	uint8_t  version;  /* batman version field */
+	uint8_t  orig[6];
+	uint8_t  ttl;
+	uint32_t seqno;
+} __attribute__((packed));
+
+struct vis_packet {
+	uint8_t  packet_type;
+	uint8_t  version;        /* batman version field */
+	uint8_t  vis_type;	 /* which type of vis-participant sent this? */
+	uint8_t  entries;	 /* number of entries behind this struct */
+	uint32_t seqno;		 /* sequence number */
+	uint8_t  ttl;		 /* TTL */
+	uint8_t  vis_orig[6];	 /* originator that informs about its
+				  * neighbors */
+	uint8_t  target_orig[6]; /* who should receive this packet */
+	uint8_t  sender_orig[6]; /* who sent or rebroadcasted this packet */
+} __attribute__((packed));
+
+#endif /* _NET_BATMAN_ADV_PACKET_H_ */

net/batman-adv/ring_buffer.c

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "ring_buffer.h"
+
+void ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index, uint8_t value)
+{
+	lq_recv[*lq_index] = value;
+	*lq_index = (*lq_index + 1) % TQ_GLOBAL_WINDOW_SIZE;
+}
+
+uint8_t ring_buffer_avg(uint8_t lq_recv[])
+{
+	uint8_t *ptr;
+	uint16_t count = 0, i = 0, sum = 0;
+
+	ptr = lq_recv;
+
+	while (i < TQ_GLOBAL_WINDOW_SIZE) {
+		if (*ptr != 0) {
+			count++;
+			sum += *ptr;
+		}
+
+		i++;
+		ptr++;
+	}
+
+	if (count == 0)
+		return 0;
+
+	return (uint8_t)(sum / count);
+}

net/batman-adv/ring_buffer.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_RING_BUFFER_H_
+#define _NET_BATMAN_ADV_RING_BUFFER_H_
+
+void ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index, uint8_t value);
+uint8_t ring_buffer_avg(uint8_t lq_recv[]);
+
+#endif /* _NET_BATMAN_ADV_RING_BUFFER_H_ */

net/batman-adv/routing.c

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "routing.h"
+#include "send.h"
+#include "hash.h"
+#include "soft-interface.h"
+#include "hard-interface.h"
+#include "icmp_socket.h"
+#include "translation-table.h"
+#include "originator.h"
+#include "types.h"
+#include "ring_buffer.h"
+#include "vis.h"
+#include "aggregation.h"
+#include "gateway_common.h"
+#include "gateway_client.h"
+#include "unicast.h"
+
+void slide_own_bcast_window(struct batman_if *batman_if)
+{
+	struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
+	struct hashtable_t *hash = bat_priv->orig_hash;
+	struct hlist_node *walk;
+	struct hlist_head *head;
+	struct element_t *bucket;
+	struct orig_node *orig_node;
+	unsigned long *word;
+	int i;
+	size_t word_index;
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry(bucket, walk, head, hlist) {
+			orig_node = bucket->data;
+			word_index = batman_if->if_num * NUM_WORDS;
+			word = &(orig_node->bcast_own[word_index]);
+
+			bit_get_packet(bat_priv, word, 1, 0);
+			orig_node->bcast_own_sum[batman_if->if_num] =
+				bit_packet_count(word);
+		}
+	}
+
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+}
+
+static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node,
+		       unsigned char *hna_buff, int hna_buff_len)
+{
+	if ((hna_buff_len != orig_node->hna_buff_len) ||
+	    ((hna_buff_len > 0) &&
+	     (orig_node->hna_buff_len > 0) &&
+	     (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) {
+
+		if (orig_node->hna_buff_len > 0)
+			hna_global_del_orig(bat_priv, orig_node,
+					    "originator changed hna");
+
+		if ((hna_buff_len > 0) && (hna_buff))
+			hna_global_add_orig(bat_priv, orig_node,
+					    hna_buff, hna_buff_len);
+	}
+}
+
+static void update_route(struct bat_priv *bat_priv,
+			 struct orig_node *orig_node,
+			 struct neigh_node *neigh_node,
+			 unsigned char *hna_buff, int hna_buff_len)
+{
+	/* route deleted */
+	if ((orig_node->router) && (!neigh_node)) {
+
+		bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
+			orig_node->orig);
+		hna_global_del_orig(bat_priv, orig_node,
+				    "originator timed out");
+
+		/* route added */
+	} else if ((!orig_node->router) && (neigh_node)) {
+
+		bat_dbg(DBG_ROUTES, bat_priv,
+			"Adding route towards: %pM (via %pM)\n",
+			orig_node->orig, neigh_node->addr);
+		hna_global_add_orig(bat_priv, orig_node,
+				    hna_buff, hna_buff_len);
+
+		/* route changed */
+	} else {
+		bat_dbg(DBG_ROUTES, bat_priv,
+			"Changing route towards: %pM "
+			"(now via %pM - was via %pM)\n",
+			orig_node->orig, neigh_node->addr,
+			orig_node->router->addr);
+	}
+
+	orig_node->router = neigh_node;
+}
+
+
+void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
+		   struct neigh_node *neigh_node, unsigned char *hna_buff,
+		   int hna_buff_len)
+{
+
+	if (!orig_node)
+		return;
+
+	if (orig_node->router != neigh_node)
+		update_route(bat_priv, orig_node, neigh_node,
+			     hna_buff, hna_buff_len);
+	/* may be just HNA changed */
+	else
+		update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len);
+}
+
+static int is_bidirectional_neigh(struct orig_node *orig_node,
+				struct orig_node *orig_neigh_node,
+				struct batman_packet *batman_packet,
+				struct batman_if *if_incoming)
+{
+	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
+	struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
+	unsigned char total_count;
+
+	if (orig_node == orig_neigh_node) {
+		list_for_each_entry(tmp_neigh_node,
+				    &orig_node->neigh_list,
+				    list) {
+
+			if (compare_orig(tmp_neigh_node->addr,
+					 orig_neigh_node->orig) &&
+			    (tmp_neigh_node->if_incoming == if_incoming))
+				neigh_node = tmp_neigh_node;
+		}
+
+		if (!neigh_node)
+			neigh_node = create_neighbor(orig_node,
+						     orig_neigh_node,
+						     orig_neigh_node->orig,
+						     if_incoming);
+		/* create_neighbor failed, return 0 */
+		if (!neigh_node)
+			return 0;
+
+		neigh_node->last_valid = jiffies;
+	} else {
+		/* find packet count of corresponding one hop neighbor */
+		list_for_each_entry(tmp_neigh_node,
+				    &orig_neigh_node->neigh_list, list) {
+
+			if (compare_orig(tmp_neigh_node->addr,
+					 orig_neigh_node->orig) &&
+			    (tmp_neigh_node->if_incoming == if_incoming))
+				neigh_node = tmp_neigh_node;
+		}
+
+		if (!neigh_node)
+			neigh_node = create_neighbor(orig_neigh_node,
+						     orig_neigh_node,
+						     orig_neigh_node->orig,
+						     if_incoming);
+		/* create_neighbor failed, return 0 */
+		if (!neigh_node)
+			return 0;
+	}
+
+	orig_node->last_valid = jiffies;
+
+	/* pay attention to not get a value bigger than 100 % */
+	total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] >
+		       neigh_node->real_packet_count ?
+		       neigh_node->real_packet_count :
+		       orig_neigh_node->bcast_own_sum[if_incoming->if_num]);
+
+	/* if we have too few packets (too less data) we set tq_own to zero */
+	/* if we receive too few packets it is not considered bidirectional */
+	if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
+	    (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
+		orig_neigh_node->tq_own = 0;
+	else
+		/* neigh_node->real_packet_count is never zero as we
+		 * only purge old information when getting new
+		 * information */
+		orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) /
+			neigh_node->real_packet_count;
+
+	/*
+	 * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
+	 * affect the nearly-symmetric links only a little, but
+	 * punishes asymmetric links more.  This will give a value
+	 * between 0 and TQ_MAX_VALUE
+	 */
+	orig_neigh_node->tq_asym_penalty =
+		TQ_MAX_VALUE -
+		(TQ_MAX_VALUE *
+		 (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
+		 (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
+		 (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) /
+		(TQ_LOCAL_WINDOW_SIZE *
+		 TQ_LOCAL_WINDOW_SIZE *
+		 TQ_LOCAL_WINDOW_SIZE);
+
+	batman_packet->tq = ((batman_packet->tq *
+			      orig_neigh_node->tq_own *
+			      orig_neigh_node->tq_asym_penalty) /
+			     (TQ_MAX_VALUE * TQ_MAX_VALUE));
+
+	bat_dbg(DBG_BATMAN, bat_priv,
+		"bidirectional: "
+		"orig = %-15pM neigh = %-15pM => own_bcast = %2i, "
+		"real recv = %2i, local tq: %3i, asym_penalty: %3i, "
+		"total tq: %3i\n",
+		orig_node->orig, orig_neigh_node->orig, total_count,
+		neigh_node->real_packet_count, orig_neigh_node->tq_own,
+		orig_neigh_node->tq_asym_penalty, batman_packet->tq);
+
+	/* if link has the minimum required transmission quality
+	 * consider it bidirectional */
+	if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
+		return 1;
+
+	return 0;
+}
+
+static void update_orig(struct bat_priv *bat_priv,
+			struct orig_node *orig_node,
+			struct ethhdr *ethhdr,
+			struct batman_packet *batman_packet,
+			struct batman_if *if_incoming,
+			unsigned char *hna_buff, int hna_buff_len,
+			char is_duplicate)
+{
+	struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
+	int tmp_hna_buff_len;
+
+	bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
+		"Searching and updating originator entry of received packet\n");
+
+	list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
+		if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
+		    (tmp_neigh_node->if_incoming == if_incoming)) {
+			neigh_node = tmp_neigh_node;
+			continue;
+		}
+
+		if (is_duplicate)
+			continue;
+
+		ring_buffer_set(tmp_neigh_node->tq_recv,
+				&tmp_neigh_node->tq_index, 0);
+		tmp_neigh_node->tq_avg =
+			ring_buffer_avg(tmp_neigh_node->tq_recv);
+	}
+
+	if (!neigh_node) {
+		struct orig_node *orig_tmp;
+
+		orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
+		if (!orig_tmp)
+			return;
+
+		neigh_node = create_neighbor(orig_node, orig_tmp,
+					     ethhdr->h_source, if_incoming);
+		if (!neigh_node)
+			return;
+	} else
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Updating existing last-hop neighbor of originator\n");
+
+	orig_node->flags = batman_packet->flags;
+	neigh_node->last_valid = jiffies;
+
+	ring_buffer_set(neigh_node->tq_recv,
+			&neigh_node->tq_index,
+			batman_packet->tq);
+	neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
+
+	if (!is_duplicate) {
+		orig_node->last_ttl = batman_packet->ttl;
+		neigh_node->last_ttl = batman_packet->ttl;
+	}
+
+	tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ?
+			    batman_packet->num_hna * ETH_ALEN : hna_buff_len);
+
+	/* if this neighbor already is our next hop there is nothing
+	 * to change */
+	if (orig_node->router == neigh_node)
+		goto update_hna;
+
+	/* if this neighbor does not offer a better TQ we won't consider it */
+	if ((orig_node->router) &&
+	    (orig_node->router->tq_avg > neigh_node->tq_avg))
+		goto update_hna;
+
+	/* if the TQ is the same and the link not more symetric we
+	 * won't consider it either */
+	if ((orig_node->router) &&
+	     ((neigh_node->tq_avg == orig_node->router->tq_avg) &&
+	     (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num]
+	      >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num])))
+		goto update_hna;
+
+	update_routes(bat_priv, orig_node, neigh_node,
+		      hna_buff, tmp_hna_buff_len);
+	goto update_gw;
+
+update_hna:
+	update_routes(bat_priv, orig_node, orig_node->router,
+		      hna_buff, tmp_hna_buff_len);
+
+update_gw:
+	if (orig_node->gw_flags != batman_packet->gw_flags)
+		gw_node_update(bat_priv, orig_node, batman_packet->gw_flags);
+
+	orig_node->gw_flags = batman_packet->gw_flags;
+
+	/* restart gateway selection if fast or late switching was enabled */
+	if ((orig_node->gw_flags) &&
+	    (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
+	    (atomic_read(&bat_priv->gw_sel_class) > 2))
+		gw_check_election(bat_priv, orig_node);
+}
+
+/* checks whether the host restarted and is in the protection time.
+ * returns:
+ *  0 if the packet is to be accepted
+ *  1 if the packet is to be ignored.
+ */
+static int window_protected(struct bat_priv *bat_priv,
+			    int32_t seq_num_diff,
+			    unsigned long *last_reset)
+{
+	if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE)
+		|| (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
+		if (time_after(jiffies, *last_reset +
+			msecs_to_jiffies(RESET_PROTECTION_MS))) {
+
+			*last_reset = jiffies;
+			bat_dbg(DBG_BATMAN, bat_priv,
+				"old packet received, start protection\n");
+
+			return 0;
+		} else
+			return 1;
+	}
+	return 0;
+}
+
+/* processes a batman packet for all interfaces, adjusts the sequence number and
+ * finds out whether it is a duplicate.
+ * returns:
+ *   1 the packet is a duplicate
+ *   0 the packet has not yet been received
+ *  -1 the packet is old and has been received while the seqno window
+ *     was protected. Caller should drop it.
+ */
+static char count_real_packets(struct ethhdr *ethhdr,
+			       struct batman_packet *batman_packet,
+			       struct batman_if *if_incoming)
+{
+	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
+	struct orig_node *orig_node;
+	struct neigh_node *tmp_neigh_node;
+	char is_duplicate = 0;
+	int32_t seq_diff;
+	int need_update = 0;
+	int set_mark;
+
+	orig_node = get_orig_node(bat_priv, batman_packet->orig);
+	if (!orig_node)
+		return 0;
+
+	seq_diff = batman_packet->seqno - orig_node->last_real_seqno;
+
+	/* signalize caller that the packet is to be dropped. */
+	if (window_protected(bat_priv, seq_diff,
+			     &orig_node->batman_seqno_reset))
+		return -1;
+
+	list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
+
+		is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
+					       orig_node->last_real_seqno,
+					       batman_packet->seqno);
+
+		if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
+		    (tmp_neigh_node->if_incoming == if_incoming))
+			set_mark = 1;
+		else
+			set_mark = 0;
+
+		/* if the window moved, set the update flag. */
+		need_update |= bit_get_packet(bat_priv,
+					      tmp_neigh_node->real_bits,
+					      seq_diff, set_mark);
+
+		tmp_neigh_node->real_packet_count =
+			bit_packet_count(tmp_neigh_node->real_bits);
+	}
+
+	if (need_update) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"updating last_seqno: old %d, new %d\n",
+			orig_node->last_real_seqno, batman_packet->seqno);
+		orig_node->last_real_seqno = batman_packet->seqno;
+	}
+
+	return is_duplicate;
+}
+
+/* copy primary address for bonding */
+static void mark_bonding_address(struct bat_priv *bat_priv,
+				 struct orig_node *orig_node,
+				 struct orig_node *orig_neigh_node,
+				 struct batman_packet *batman_packet)
+
+{
+	if (batman_packet->flags & PRIMARIES_FIRST_HOP)
+		memcpy(orig_neigh_node->primary_addr,
+		       orig_node->orig, ETH_ALEN);
+
+	return;
+}
+
+/* mark possible bond.candidates in the neighbor list */
+void update_bonding_candidates(struct bat_priv *bat_priv,
+			       struct orig_node *orig_node)
+{
+	int candidates;
+	int interference_candidate;
+	int best_tq;
+	struct neigh_node *tmp_neigh_node, *tmp_neigh_node2;
+	struct neigh_node *first_candidate, *last_candidate;
+
+	/* update the candidates for this originator */
+	if (!orig_node->router) {
+		orig_node->bond.candidates = 0;
+		return;
+	}
+
+	best_tq = orig_node->router->tq_avg;
+
+	/* update bond.candidates */
+
+	candidates = 0;
+
+	/* mark other nodes which also received "PRIMARIES FIRST HOP" packets
+	 * as "bonding partner" */
+
+	/* first, zero the list */
+	list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
+		tmp_neigh_node->next_bond_candidate = NULL;
+	}
+
+	first_candidate = NULL;
+	last_candidate = NULL;
+	list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
+
+		/* only consider if it has the same primary address ...  */
+		if (memcmp(orig_node->orig,
+				tmp_neigh_node->orig_node->primary_addr,
+				ETH_ALEN) != 0)
+			continue;
+
+		/* ... and is good enough to be considered */
+		if (tmp_neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD)
+			continue;
+
+		/* check if we have another candidate with the same
+		 * mac address or interface. If we do, we won't
+		 * select this candidate because of possible interference. */
+
+		interference_candidate = 0;
+		list_for_each_entry(tmp_neigh_node2,
+				&orig_node->neigh_list, list) {
+
+			if (tmp_neigh_node2 == tmp_neigh_node)
+				continue;
+
+			/* we only care if the other candidate is even
+			 * considered as candidate. */
+			if (!tmp_neigh_node2->next_bond_candidate)
+				continue;
+
+
+			if ((tmp_neigh_node->if_incoming ==
+				tmp_neigh_node2->if_incoming)
+				|| (memcmp(tmp_neigh_node->addr,
+				tmp_neigh_node2->addr, ETH_ALEN) == 0)) {
+
+				interference_candidate = 1;
+				break;
+			}
+		}
+		/* don't care further if it is an interference candidate */
+		if (interference_candidate)
+			continue;
+
+		if (!first_candidate) {
+			first_candidate = tmp_neigh_node;
+			tmp_neigh_node->next_bond_candidate = first_candidate;
+		} else
+			tmp_neigh_node->next_bond_candidate = last_candidate;
+
+		last_candidate = tmp_neigh_node;
+
+		candidates++;
+	}
+
+	if (candidates > 0) {
+		first_candidate->next_bond_candidate = last_candidate;
+		orig_node->bond.selected = first_candidate;
+	}
+
+	orig_node->bond.candidates = candidates;
+}
+
+void receive_bat_packet(struct ethhdr *ethhdr,
+				struct batman_packet *batman_packet,
+				unsigned char *hna_buff, int hna_buff_len,
+				struct batman_if *if_incoming)
+{
+	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
+	struct batman_if *batman_if;
+	struct orig_node *orig_neigh_node, *orig_node;
+	char has_directlink_flag;
+	char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
+	char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
+	char is_duplicate;
+	uint32_t if_incoming_seqno;
+
+	/* Silently drop when the batman packet is actually not a
+	 * correct packet.
+	 *
+	 * This might happen if a packet is padded (e.g. Ethernet has a
+	 * minimum frame length of 64 byte) and the aggregation interprets
+	 * it as an additional length.
+	 *
+	 * TODO: A more sane solution would be to have a bit in the
+	 * batman_packet to detect whether the packet is the last
+	 * packet in an aggregation.  Here we expect that the padding
+	 * is always zero (or not 0x01)
+	 */
+	if (batman_packet->packet_type != BAT_PACKET)
+		return;
+
+	/* could be changed by schedule_own_packet() */
+	if_incoming_seqno = atomic_read(&if_incoming->seqno);
+
+	has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0);
+
+	is_single_hop_neigh = (compare_orig(ethhdr->h_source,
+					    batman_packet->orig) ? 1 : 0);
+
+	bat_dbg(DBG_BATMAN, bat_priv,
+		"Received BATMAN packet via NB: %pM, IF: %s [%pM] "
+		"(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, "
+		"TTL %d, V %d, IDF %d)\n",
+		ethhdr->h_source, if_incoming->net_dev->name,
+		if_incoming->net_dev->dev_addr, batman_packet->orig,
+		batman_packet->prev_sender, batman_packet->seqno,
+		batman_packet->tq, batman_packet->ttl, batman_packet->version,
+		has_directlink_flag);
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(batman_if, &if_list, list) {
+		if (batman_if->if_status != IF_ACTIVE)
+			continue;
+
+		if (batman_if->soft_iface != if_incoming->soft_iface)
+			continue;
+
+		if (compare_orig(ethhdr->h_source,
+				 batman_if->net_dev->dev_addr))
+			is_my_addr = 1;
+
+		if (compare_orig(batman_packet->orig,
+				 batman_if->net_dev->dev_addr))
+			is_my_orig = 1;
+
+		if (compare_orig(batman_packet->prev_sender,
+				 batman_if->net_dev->dev_addr))
+			is_my_oldorig = 1;
+
+		if (compare_orig(ethhdr->h_source, broadcast_addr))
+			is_broadcast = 1;
+	}
+	rcu_read_unlock();
+
+	if (batman_packet->version != COMPAT_VERSION) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Drop packet: incompatible batman version (%i)\n",
+			batman_packet->version);
+		return;
+	}
+
+	if (is_my_addr) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Drop packet: received my own broadcast (sender: %pM"
+			")\n",
+			ethhdr->h_source);
+		return;
+	}
+
+	if (is_broadcast) {
+		bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
+		"ignoring all packets with broadcast source addr (sender: %pM"
+		")\n", ethhdr->h_source);
+		return;
+	}
+
+	if (is_my_orig) {
+		unsigned long *word;
+		int offset;
+
+		orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
+
+		if (!orig_neigh_node)
+			return;
+
+		/* neighbor has to indicate direct link and it has to
+		 * come via the corresponding interface */
+		/* if received seqno equals last send seqno save new
+		 * seqno for bidirectional check */
+		if (has_directlink_flag &&
+		    compare_orig(if_incoming->net_dev->dev_addr,
+				 batman_packet->orig) &&
+		    (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
+			offset = if_incoming->if_num * NUM_WORDS;
+			word = &(orig_neigh_node->bcast_own[offset]);
+			bit_mark(word, 0);
+			orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
+				bit_packet_count(word);
+		}
+
+		bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
+			"originator packet from myself (via neighbor)\n");
+		return;
+	}
+
+	if (is_my_oldorig) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Drop packet: ignoring all rebroadcast echos (sender: "
+			"%pM)\n", ethhdr->h_source);
+		return;
+	}
+
+	orig_node = get_orig_node(bat_priv, batman_packet->orig);
+	if (!orig_node)
+		return;
+
+	is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming);
+
+	if (is_duplicate == -1) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Drop packet: packet within seqno protection time "
+			"(sender: %pM)\n", ethhdr->h_source);
+		return;
+	}
+
+	if (batman_packet->tq == 0) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Drop packet: originator packet with tq equal 0\n");
+		return;
+	}
+
+	/* avoid temporary routing loops */
+	if ((orig_node->router) &&
+	    (orig_node->router->orig_node->router) &&
+	    (compare_orig(orig_node->router->addr,
+			  batman_packet->prev_sender)) &&
+	    !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) &&
+	    (compare_orig(orig_node->router->addr,
+			  orig_node->router->orig_node->router->addr))) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Drop packet: ignoring all rebroadcast packets that "
+			"may make me loop (sender: %pM)\n", ethhdr->h_source);
+		return;
+	}
+
+	/* if sender is a direct neighbor the sender mac equals
+	 * originator mac */
+	orig_neigh_node = (is_single_hop_neigh ?
+			   orig_node :
+			   get_orig_node(bat_priv, ethhdr->h_source));
+	if (!orig_neigh_node)
+		return;
+
+	/* drop packet if sender is not a direct neighbor and if we
+	 * don't route towards it */
+	if (!is_single_hop_neigh && (!orig_neigh_node->router)) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Drop packet: OGM via unknown neighbor!\n");
+		return;
+	}
+
+	is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
+						batman_packet, if_incoming);
+
+	/* update ranking if it is not a duplicate or has the same
+	 * seqno and similar ttl as the non-duplicate */
+	if (is_bidirectional &&
+	    (!is_duplicate ||
+	     ((orig_node->last_real_seqno == batman_packet->seqno) &&
+	      (orig_node->last_ttl - 3 <= batman_packet->ttl))))
+		update_orig(bat_priv, orig_node, ethhdr, batman_packet,
+			    if_incoming, hna_buff, hna_buff_len, is_duplicate);
+
+	mark_bonding_address(bat_priv, orig_node,
+			     orig_neigh_node, batman_packet);
+	update_bonding_candidates(bat_priv, orig_node);
+
+	/* is single hop (direct) neighbor */
+	if (is_single_hop_neigh) {
+
+		/* mark direct link on incoming interface */
+		schedule_forward_packet(orig_node, ethhdr, batman_packet,
+					1, hna_buff_len, if_incoming);
+
+		bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
+			"rebroadcast neighbor packet with direct link flag\n");
+		return;
+	}
+
+	/* multihop originator */
+	if (!is_bidirectional) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Drop packet: not received via bidirectional link\n");
+		return;
+	}
+
+	if (is_duplicate) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Drop packet: duplicate packet received\n");
+		return;
+	}
+
+	bat_dbg(DBG_BATMAN, bat_priv,
+		"Forwarding packet: rebroadcast originator packet\n");
+	schedule_forward_packet(orig_node, ethhdr, batman_packet,
+				0, hna_buff_len, if_incoming);
+}
+
+int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if)
+{
+	struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
+	struct ethhdr *ethhdr;
+
+	/* drop packet if it has not necessary minimum size */
+	if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet))))
+		return NET_RX_DROP;
+
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	/* packet with broadcast indication but unicast recipient */
+	if (!is_broadcast_ether_addr(ethhdr->h_dest))
+		return NET_RX_DROP;
+
+	/* packet with broadcast sender address */
+	if (is_broadcast_ether_addr(ethhdr->h_source))
+		return NET_RX_DROP;
+
+	/* create a copy of the skb, if needed, to modify it. */
+	if (skb_cow(skb, 0) < 0)
+		return NET_RX_DROP;
+
+	/* keep skb linear */
+	if (skb_linearize(skb) < 0)
+		return NET_RX_DROP;
+
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	receive_aggr_bat_packet(ethhdr,
+				skb->data,
+				skb_headlen(skb),
+				batman_if);
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	kfree_skb(skb);
+	return NET_RX_SUCCESS;
+}
+
+static int recv_my_icmp_packet(struct bat_priv *bat_priv,
+			       struct sk_buff *skb, size_t icmp_len)
+{
+	struct orig_node *orig_node;
+	struct icmp_packet_rr *icmp_packet;
+	struct ethhdr *ethhdr;
+	struct batman_if *batman_if;
+	int ret;
+	uint8_t dstaddr[ETH_ALEN];
+
+	icmp_packet = (struct icmp_packet_rr *)skb->data;
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	/* add data to device queue */
+	if (icmp_packet->msg_type != ECHO_REQUEST) {
+		bat_socket_receive_packet(icmp_packet, icmp_len);
+		return NET_RX_DROP;
+	}
+
+	if (!bat_priv->primary_if)
+		return NET_RX_DROP;
+
+	/* answer echo request (ping) */
+	/* get routing information */
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
+						   compare_orig, choose_orig,
+						   icmp_packet->orig));
+	ret = NET_RX_DROP;
+
+	if ((orig_node) && (orig_node->router)) {
+
+		/* don't lock while sending the packets ... we therefore
+		 * copy the required data before sending */
+		batman_if = orig_node->router->if_incoming;
+		memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+		/* create a copy of the skb, if needed, to modify it. */
+		if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
+			return NET_RX_DROP;
+
+		icmp_packet = (struct icmp_packet_rr *)skb->data;
+		ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+		memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
+		memcpy(icmp_packet->orig,
+		       bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+		icmp_packet->msg_type = ECHO_REPLY;
+		icmp_packet->ttl = TTL;
+
+		send_skb_packet(skb, batman_if, dstaddr);
+		ret = NET_RX_SUCCESS;
+
+	} else
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	return ret;
+}
+
+static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
+				  struct sk_buff *skb, size_t icmp_len)
+{
+	struct orig_node *orig_node;
+	struct icmp_packet *icmp_packet;
+	struct ethhdr *ethhdr;
+	struct batman_if *batman_if;
+	int ret;
+	uint8_t dstaddr[ETH_ALEN];
+
+	icmp_packet = (struct icmp_packet *)skb->data;
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	/* send TTL exceeded if packet is an echo request (traceroute) */
+	if (icmp_packet->msg_type != ECHO_REQUEST) {
+		pr_debug("Warning - can't forward icmp packet from %pM to "
+			 "%pM: ttl exceeded\n", icmp_packet->orig,
+			 icmp_packet->dst);
+		return NET_RX_DROP;
+	}
+
+	if (!bat_priv->primary_if)
+		return NET_RX_DROP;
+
+	/* get routing information */
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	orig_node = ((struct orig_node *)
+		     hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
+			       icmp_packet->orig));
+	ret = NET_RX_DROP;
+
+	if ((orig_node) && (orig_node->router)) {
+
+		/* don't lock while sending the packets ... we therefore
+		 * copy the required data before sending */
+		batman_if = orig_node->router->if_incoming;
+		memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+		/* create a copy of the skb, if needed, to modify it. */
+		if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
+			return NET_RX_DROP;
+
+		icmp_packet = (struct icmp_packet *) skb->data;
+		ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+		memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
+		memcpy(icmp_packet->orig,
+		       bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+		icmp_packet->msg_type = TTL_EXCEEDED;
+		icmp_packet->ttl = TTL;
+
+		send_skb_packet(skb, batman_if, dstaddr);
+		ret = NET_RX_SUCCESS;
+
+	} else
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	return ret;
+}
+
+
+int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if)
+{
+	struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+	struct icmp_packet_rr *icmp_packet;
+	struct ethhdr *ethhdr;
+	struct orig_node *orig_node;
+	struct batman_if *batman_if;
+	int hdr_size = sizeof(struct icmp_packet);
+	int ret;
+	uint8_t dstaddr[ETH_ALEN];
+
+	/**
+	 * we truncate all incoming icmp packets if they don't match our size
+	 */
+	if (skb->len >= sizeof(struct icmp_packet_rr))
+		hdr_size = sizeof(struct icmp_packet_rr);
+
+	/* drop packet if it has not necessary minimum size */
+	if (unlikely(!pskb_may_pull(skb, hdr_size)))
+		return NET_RX_DROP;
+
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	/* packet with unicast indication but broadcast recipient */
+	if (is_broadcast_ether_addr(ethhdr->h_dest))
+		return NET_RX_DROP;
+
+	/* packet with broadcast sender address */
+	if (is_broadcast_ether_addr(ethhdr->h_source))
+		return NET_RX_DROP;
+
+	/* not for me */
+	if (!is_my_mac(ethhdr->h_dest))
+		return NET_RX_DROP;
+
+	icmp_packet = (struct icmp_packet_rr *)skb->data;
+
+	/* add record route information if not full */
+	if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
+	    (icmp_packet->rr_cur < BAT_RR_LEN)) {
+		memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
+			ethhdr->h_dest, ETH_ALEN);
+		icmp_packet->rr_cur++;
+	}
+
+	/* packet for me */
+	if (is_my_mac(icmp_packet->dst))
+		return recv_my_icmp_packet(bat_priv, skb, hdr_size);
+
+	/* TTL exceeded */
+	if (icmp_packet->ttl < 2)
+		return recv_icmp_ttl_exceeded(bat_priv, skb, hdr_size);
+
+	ret = NET_RX_DROP;
+
+	/* get routing information */
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	orig_node = ((struct orig_node *)
+		     hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
+			       icmp_packet->dst));
+
+	if ((orig_node) && (orig_node->router)) {
+
+		/* don't lock while sending the packets ... we therefore
+		 * copy the required data before sending */
+		batman_if = orig_node->router->if_incoming;
+		memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+		/* create a copy of the skb, if needed, to modify it. */
+		if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
+			return NET_RX_DROP;
+
+		icmp_packet = (struct icmp_packet_rr *)skb->data;
+		ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+		/* decrement ttl */
+		icmp_packet->ttl--;
+
+		/* route it */
+		send_skb_packet(skb, batman_if, dstaddr);
+		ret = NET_RX_SUCCESS;
+
+	} else
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	return ret;
+}
+
+/* find a suitable router for this originator, and use
+ * bonding if possible. */
+struct neigh_node *find_router(struct bat_priv *bat_priv,
+			       struct orig_node *orig_node,
+			       struct batman_if *recv_if)
+{
+	struct orig_node *primary_orig_node;
+	struct orig_node *router_orig;
+	struct neigh_node *router, *first_candidate, *best_router;
+	static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
+	int bonding_enabled;
+
+	if (!orig_node)
+		return NULL;
+
+	if (!orig_node->router)
+		return NULL;
+
+	/* without bonding, the first node should
+	 * always choose the default router. */
+
+	bonding_enabled = atomic_read(&bat_priv->bonding);
+
+	if ((!recv_if) && (!bonding_enabled))
+		return orig_node->router;
+
+	router_orig = orig_node->router->orig_node;
+
+	/* if we have something in the primary_addr, we can search
+	 * for a potential bonding candidate. */
+	if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0)
+		return orig_node->router;
+
+	/* find the orig_node which has the primary interface. might
+	 * even be the same as our router_orig in many cases */
+
+	if (memcmp(router_orig->primary_addr,
+				router_orig->orig, ETH_ALEN) == 0) {
+		primary_orig_node = router_orig;
+	} else {
+		primary_orig_node = hash_find(bat_priv->orig_hash, compare_orig,
+					       choose_orig,
+					       router_orig->primary_addr);
+
+		if (!primary_orig_node)
+			return orig_node->router;
+	}
+
+	/* with less than 2 candidates, we can't do any
+	 * bonding and prefer the original router. */
+
+	if (primary_orig_node->bond.candidates < 2)
+		return orig_node->router;
+
+
+	/* all nodes between should choose a candidate which
+	 * is is not on the interface where the packet came
+	 * in. */
+	first_candidate = primary_orig_node->bond.selected;
+	router = first_candidate;
+
+	if (bonding_enabled) {
+		/* in the bonding case, send the packets in a round
+		 * robin fashion over the remaining interfaces. */
+		do {
+			/* recv_if == NULL on the first node. */
+			if (router->if_incoming != recv_if)
+				break;
+
+			router = router->next_bond_candidate;
+		} while (router != first_candidate);
+
+		primary_orig_node->bond.selected = router->next_bond_candidate;
+
+	} else {
+		/* if bonding is disabled, use the best of the
+		 * remaining candidates which are not using
+		 * this interface. */
+		best_router = first_candidate;
+
+		do {
+			/* recv_if == NULL on the first node. */
+			if ((router->if_incoming != recv_if) &&
+				(router->tq_avg > best_router->tq_avg))
+					best_router = router;
+
+			router = router->next_bond_candidate;
+		} while (router != first_candidate);
+
+		router = best_router;
+	}
+
+	return router;
+}
+
+static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
+{
+	struct ethhdr *ethhdr;
+
+	/* drop packet if it has not necessary minimum size */
+	if (unlikely(!pskb_may_pull(skb, hdr_size)))
+		return -1;
+
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	/* packet with unicast indication but broadcast recipient */
+	if (is_broadcast_ether_addr(ethhdr->h_dest))
+		return -1;
+
+	/* packet with broadcast sender address */
+	if (is_broadcast_ether_addr(ethhdr->h_source))
+		return -1;
+
+	/* not for me */
+	if (!is_my_mac(ethhdr->h_dest))
+		return -1;
+
+	return 0;
+}
+
+int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if,
+			 int hdr_size)
+{
+	struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+	struct orig_node *orig_node;
+	struct neigh_node *router;
+	struct batman_if *batman_if;
+	uint8_t dstaddr[ETH_ALEN];
+	struct unicast_packet *unicast_packet;
+	struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
+	int ret;
+	struct sk_buff *new_skb;
+
+	unicast_packet = (struct unicast_packet *)skb->data;
+
+	/* TTL exceeded */
+	if (unicast_packet->ttl < 2) {
+		pr_debug("Warning - can't forward unicast packet from %pM to "
+			 "%pM: ttl exceeded\n", ethhdr->h_source,
+			 unicast_packet->dest);
+		return NET_RX_DROP;
+	}
+
+	/* get routing information */
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	orig_node = ((struct orig_node *)
+		     hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
+			       unicast_packet->dest));
+
+	router = find_router(bat_priv, orig_node, recv_if);
+
+	if (!router) {
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+		return NET_RX_DROP;
+	}
+
+	/* don't lock while sending the packets ... we therefore
+	 * copy the required data before sending */
+
+	batman_if = router->if_incoming;
+	memcpy(dstaddr, router->addr, ETH_ALEN);
+
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	/* create a copy of the skb, if needed, to modify it. */
+	if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
+		return NET_RX_DROP;
+
+	unicast_packet = (struct unicast_packet *)skb->data;
+
+	if (unicast_packet->packet_type == BAT_UNICAST &&
+	    atomic_read(&bat_priv->fragmentation) &&
+	    skb->len > batman_if->net_dev->mtu)
+		return frag_send_skb(skb, bat_priv, batman_if,
+				     dstaddr);
+
+	if (unicast_packet->packet_type == BAT_UNICAST_FRAG &&
+	    2 * skb->len - hdr_size <= batman_if->net_dev->mtu) {
+
+		ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
+
+		if (ret == NET_RX_DROP)
+			return NET_RX_DROP;
+
+		/* packet was buffered for late merge */
+		if (!new_skb)
+			return NET_RX_SUCCESS;
+
+		skb = new_skb;
+		unicast_packet = (struct unicast_packet *)skb->data;
+	}
+
+	/* decrement ttl */
+	unicast_packet->ttl--;
+
+	/* route it */
+	send_skb_packet(skb, batman_if, dstaddr);
+
+	return NET_RX_SUCCESS;
+}
+
+int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if)
+{
+	struct unicast_packet *unicast_packet;
+	int hdr_size = sizeof(struct unicast_packet);
+
+	if (check_unicast_packet(skb, hdr_size) < 0)
+		return NET_RX_DROP;
+
+	unicast_packet = (struct unicast_packet *)skb->data;
+
+	/* packet for me */
+	if (is_my_mac(unicast_packet->dest)) {
+		interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
+		return NET_RX_SUCCESS;
+	}
+
+	return route_unicast_packet(skb, recv_if, hdr_size);
+}
+
+int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
+{
+	struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+	struct unicast_frag_packet *unicast_packet;
+	int hdr_size = sizeof(struct unicast_frag_packet);
+	struct sk_buff *new_skb = NULL;
+	int ret;
+
+	if (check_unicast_packet(skb, hdr_size) < 0)
+		return NET_RX_DROP;
+
+	unicast_packet = (struct unicast_frag_packet *)skb->data;
+
+	/* packet for me */
+	if (is_my_mac(unicast_packet->dest)) {
+
+		ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
+
+		if (ret == NET_RX_DROP)
+			return NET_RX_DROP;
+
+		/* packet was buffered for late merge */
+		if (!new_skb)
+			return NET_RX_SUCCESS;
+
+		interface_rx(recv_if->soft_iface, new_skb, recv_if,
+			     sizeof(struct unicast_packet));
+		return NET_RX_SUCCESS;
+	}
+
+	return route_unicast_packet(skb, recv_if, hdr_size);
+}
+
+
+int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if)
+{
+	struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+	struct orig_node *orig_node;
+	struct bcast_packet *bcast_packet;
+	struct ethhdr *ethhdr;
+	int hdr_size = sizeof(struct bcast_packet);
+	int32_t seq_diff;
+
+	/* drop packet if it has not necessary minimum size */
+	if (unlikely(!pskb_may_pull(skb, hdr_size)))
+		return NET_RX_DROP;
+
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	/* packet with broadcast indication but unicast recipient */
+	if (!is_broadcast_ether_addr(ethhdr->h_dest))
+		return NET_RX_DROP;
+
+	/* packet with broadcast sender address */
+	if (is_broadcast_ether_addr(ethhdr->h_source))
+		return NET_RX_DROP;
+
+	/* ignore broadcasts sent by myself */
+	if (is_my_mac(ethhdr->h_source))
+		return NET_RX_DROP;
+
+	bcast_packet = (struct bcast_packet *)skb->data;
+
+	/* ignore broadcasts originated by myself */
+	if (is_my_mac(bcast_packet->orig))
+		return NET_RX_DROP;
+
+	if (bcast_packet->ttl < 2)
+		return NET_RX_DROP;
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	orig_node = ((struct orig_node *)
+		     hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
+			       bcast_packet->orig));
+
+	if (!orig_node) {
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+		return NET_RX_DROP;
+	}
+
+	/* check whether the packet is a duplicate */
+	if (get_bit_status(orig_node->bcast_bits,
+			   orig_node->last_bcast_seqno,
+			   ntohl(bcast_packet->seqno))) {
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+		return NET_RX_DROP;
+	}
+
+	seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
+
+	/* check whether the packet is old and the host just restarted. */
+	if (window_protected(bat_priv, seq_diff,
+			     &orig_node->bcast_seqno_reset)) {
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+		return NET_RX_DROP;
+	}
+
+	/* mark broadcast in flood history, update window position
+	 * if required. */
+	if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
+		orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
+
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+	/* rebroadcast packet */
+	add_bcast_packet_to_list(bat_priv, skb);
+
+	/* broadcast for me */
+	interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
+
+	return NET_RX_SUCCESS;
+}
+
+int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if)
+{
+	struct vis_packet *vis_packet;
+	struct ethhdr *ethhdr;
+	struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+	int hdr_size = sizeof(struct vis_packet);
+
+	/* keep skb linear */
+	if (skb_linearize(skb) < 0)
+		return NET_RX_DROP;
+
+	if (unlikely(!pskb_may_pull(skb, hdr_size)))
+		return NET_RX_DROP;
+
+	vis_packet = (struct vis_packet *)skb->data;
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	/* not for me */
+	if (!is_my_mac(ethhdr->h_dest))
+		return NET_RX_DROP;
+
+	/* ignore own packets */
+	if (is_my_mac(vis_packet->vis_orig))
+		return NET_RX_DROP;
+
+	if (is_my_mac(vis_packet->sender_orig))
+		return NET_RX_DROP;
+
+	switch (vis_packet->vis_type) {
+	case VIS_TYPE_SERVER_SYNC:
+		receive_server_sync_packet(bat_priv, vis_packet,
+					   skb_headlen(skb));
+		break;
+
+	case VIS_TYPE_CLIENT_UPDATE:
+		receive_client_update_packet(bat_priv, vis_packet,
+					     skb_headlen(skb));
+		break;
+
+	default:	/* ignore unknown packet */
+		break;
+	}
+
+	/* We take a copy of the data in the packet, so we should
+	   always free the skbuf. */
+	return NET_RX_DROP;
+}

net/batman-adv/routing.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_ROUTING_H_
+#define _NET_BATMAN_ADV_ROUTING_H_
+
+#include "types.h"
+
+void slide_own_bcast_window(struct batman_if *batman_if);
+void receive_bat_packet(struct ethhdr *ethhdr,
+				struct batman_packet *batman_packet,
+				unsigned char *hna_buff, int hna_buff_len,
+				struct batman_if *if_incoming);
+void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
+		   struct neigh_node *neigh_node, unsigned char *hna_buff,
+		   int hna_buff_len);
+int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if,
+			 int hdr_size);
+int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if);
+int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if);
+int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if);
+int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if);
+int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if);
+int recv_bat_packet(struct sk_buff *skb, struct batman_if *recv_if);
+struct neigh_node *find_router(struct bat_priv *bat_priv,
+		struct orig_node *orig_node, struct batman_if *recv_if);
+void update_bonding_candidates(struct bat_priv *bat_priv,
+			       struct orig_node *orig_node);
+
+#endif /* _NET_BATMAN_ADV_ROUTING_H_ */

net/batman-adv/send.c

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "send.h"
+#include "routing.h"
+#include "translation-table.h"
+#include "soft-interface.h"
+#include "hard-interface.h"
+#include "types.h"
+#include "vis.h"
+#include "aggregation.h"
+#include "gateway_common.h"
+#include "originator.h"
+
+static void send_outstanding_bcast_packet(struct work_struct *work);
+
+/* apply hop penalty for a normal link */
+static uint8_t hop_penalty(const uint8_t tq, struct bat_priv *bat_priv)
+{
+	int hop_penalty = atomic_read(&bat_priv->hop_penalty);
+	return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE);
+}
+
+/* when do we schedule our own packet to be sent */
+static unsigned long own_send_time(struct bat_priv *bat_priv)
+{
+	return jiffies + msecs_to_jiffies(
+		   atomic_read(&bat_priv->orig_interval) -
+		   JITTER + (random32() % 2*JITTER));
+}
+
+/* when do we schedule a forwarded packet to be sent */
+static unsigned long forward_send_time(struct bat_priv *bat_priv)
+{
+	return jiffies + msecs_to_jiffies(random32() % (JITTER/2));
+}
+
+/* send out an already prepared packet to the given address via the
+ * specified batman interface */
+int send_skb_packet(struct sk_buff *skb,
+				struct batman_if *batman_if,
+				uint8_t *dst_addr)
+{
+	struct ethhdr *ethhdr;
+
+	if (batman_if->if_status != IF_ACTIVE)
+		goto send_skb_err;
+
+	if (unlikely(!batman_if->net_dev))
+		goto send_skb_err;
+
+	if (!(batman_if->net_dev->flags & IFF_UP)) {
+		pr_warning("Interface %s is not up - can't send packet via "
+			   "that interface!\n", batman_if->net_dev->name);
+		goto send_skb_err;
+	}
+
+	/* push to the ethernet header. */
+	if (my_skb_head_push(skb, sizeof(struct ethhdr)) < 0)
+		goto send_skb_err;
+
+	skb_reset_mac_header(skb);
+
+	ethhdr = (struct ethhdr *) skb_mac_header(skb);
+	memcpy(ethhdr->h_source, batman_if->net_dev->dev_addr, ETH_ALEN);
+	memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
+	ethhdr->h_proto = __constant_htons(ETH_P_BATMAN);
+
+	skb_set_network_header(skb, ETH_HLEN);
+	skb->priority = TC_PRIO_CONTROL;
+	skb->protocol = __constant_htons(ETH_P_BATMAN);
+
+	skb->dev = batman_if->net_dev;
+
+	/* dev_queue_xmit() returns a negative result on error.	 However on
+	 * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
+	 * (which is > 0). This will not be treated as an error. */
+
+	return dev_queue_xmit(skb);
+send_skb_err:
+	kfree_skb(skb);
+	return NET_XMIT_DROP;
+}
+
+/* Send a packet to a given interface */
+static void send_packet_to_if(struct forw_packet *forw_packet,
+			      struct batman_if *batman_if)
+{
+	struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
+	char *fwd_str;
+	uint8_t packet_num;
+	int16_t buff_pos;
+	struct batman_packet *batman_packet;
+	struct sk_buff *skb;
+
+	if (batman_if->if_status != IF_ACTIVE)
+		return;
+
+	packet_num = 0;
+	buff_pos = 0;
+	batman_packet = (struct batman_packet *)forw_packet->skb->data;
+
+	/* adjust all flags and log packets */
+	while (aggregated_packet(buff_pos,
+				 forw_packet->packet_len,
+				 batman_packet->num_hna)) {
+
+		/* we might have aggregated direct link packets with an
+		 * ordinary base packet */
+		if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
+		    (forw_packet->if_incoming == batman_if))
+			batman_packet->flags |= DIRECTLINK;
+		else
+			batman_packet->flags &= ~DIRECTLINK;
+
+		fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
+							    "Sending own" :
+							    "Forwarding"));
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d,"
+			" IDF %s) on interface %s [%pM]\n",
+			fwd_str, (packet_num > 0 ? "aggregated " : ""),
+			batman_packet->orig, ntohl(batman_packet->seqno),
+			batman_packet->tq, batman_packet->ttl,
+			(batman_packet->flags & DIRECTLINK ?
+			 "on" : "off"),
+			batman_if->net_dev->name, batman_if->net_dev->dev_addr);
+
+		buff_pos += sizeof(struct batman_packet) +
+			(batman_packet->num_hna * ETH_ALEN);
+		packet_num++;
+		batman_packet = (struct batman_packet *)
+			(forw_packet->skb->data + buff_pos);
+	}
+
+	/* create clone because function is called more than once */
+	skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
+	if (skb)
+		send_skb_packet(skb, batman_if, broadcast_addr);
+}
+
+/* send a batman packet */
+static void send_packet(struct forw_packet *forw_packet)
+{
+	struct batman_if *batman_if;
+	struct net_device *soft_iface;
+	struct bat_priv *bat_priv;
+	struct batman_packet *batman_packet =
+		(struct batman_packet *)(forw_packet->skb->data);
+	unsigned char directlink = (batman_packet->flags & DIRECTLINK ? 1 : 0);
+
+	if (!forw_packet->if_incoming) {
+		pr_err("Error - can't forward packet: incoming iface not "
+		       "specified\n");
+		return;
+	}
+
+	soft_iface = forw_packet->if_incoming->soft_iface;
+	bat_priv = netdev_priv(soft_iface);
+
+	if (forw_packet->if_incoming->if_status != IF_ACTIVE)
+		return;
+
+	/* multihomed peer assumed */
+	/* non-primary OGMs are only broadcasted on their interface */
+	if ((directlink && (batman_packet->ttl == 1)) ||
+	    (forw_packet->own && (forw_packet->if_incoming->if_num > 0))) {
+
+		/* FIXME: what about aggregated packets ? */
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"%s packet (originator %pM, seqno %d, TTL %d) "
+			"on interface %s [%pM]\n",
+			(forw_packet->own ? "Sending own" : "Forwarding"),
+			batman_packet->orig, ntohl(batman_packet->seqno),
+			batman_packet->ttl,
+			forw_packet->if_incoming->net_dev->name,
+			forw_packet->if_incoming->net_dev->dev_addr);
+
+		/* skb is only used once and than forw_packet is free'd */
+		send_skb_packet(forw_packet->skb, forw_packet->if_incoming,
+				broadcast_addr);
+		forw_packet->skb = NULL;
+
+		return;
+	}
+
+	/* broadcast on every interface */
+	rcu_read_lock();
+	list_for_each_entry_rcu(batman_if, &if_list, list) {
+		if (batman_if->soft_iface != soft_iface)
+			continue;
+
+		send_packet_to_if(forw_packet, batman_if);
+	}
+	rcu_read_unlock();
+}
+
+static void rebuild_batman_packet(struct bat_priv *bat_priv,
+				  struct batman_if *batman_if)
+{
+	int new_len;
+	unsigned char *new_buff;
+	struct batman_packet *batman_packet;
+
+	new_len = sizeof(struct batman_packet) +
+			(bat_priv->num_local_hna * ETH_ALEN);
+	new_buff = kmalloc(new_len, GFP_ATOMIC);
+
+	/* keep old buffer if kmalloc should fail */
+	if (new_buff) {
+		memcpy(new_buff, batman_if->packet_buff,
+		       sizeof(struct batman_packet));
+		batman_packet = (struct batman_packet *)new_buff;
+
+		batman_packet->num_hna = hna_local_fill_buffer(bat_priv,
+				new_buff + sizeof(struct batman_packet),
+				new_len - sizeof(struct batman_packet));
+
+		kfree(batman_if->packet_buff);
+		batman_if->packet_buff = new_buff;
+		batman_if->packet_len = new_len;
+	}
+}
+
+void schedule_own_packet(struct batman_if *batman_if)
+{
+	struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
+	unsigned long send_time;
+	struct batman_packet *batman_packet;
+	int vis_server;
+
+	if ((batman_if->if_status == IF_NOT_IN_USE) ||
+	    (batman_if->if_status == IF_TO_BE_REMOVED))
+		return;
+
+	vis_server = atomic_read(&bat_priv->vis_mode);
+
+	/**
+	 * the interface gets activated here to avoid race conditions between
+	 * the moment of activating the interface in
+	 * hardif_activate_interface() where the originator mac is set and
+	 * outdated packets (especially uninitialized mac addresses) in the
+	 * packet queue
+	 */
+	if (batman_if->if_status == IF_TO_BE_ACTIVATED)
+		batman_if->if_status = IF_ACTIVE;
+
+	/* if local hna has changed and interface is a primary interface */
+	if ((atomic_read(&bat_priv->hna_local_changed)) &&
+	    (batman_if == bat_priv->primary_if))
+		rebuild_batman_packet(bat_priv, batman_if);
+
+	/**
+	 * NOTE: packet_buff might just have been re-allocated in
+	 * rebuild_batman_packet()
+	 */
+	batman_packet = (struct batman_packet *)batman_if->packet_buff;
+
+	/* change sequence number to network order */
+	batman_packet->seqno =
+		htonl((uint32_t)atomic_read(&batman_if->seqno));
+
+	if (vis_server == VIS_TYPE_SERVER_SYNC)
+		batman_packet->flags |= VIS_SERVER;
+	else
+		batman_packet->flags &= ~VIS_SERVER;
+
+	if ((batman_if == bat_priv->primary_if) &&
+	    (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
+		batman_packet->gw_flags =
+				(uint8_t)atomic_read(&bat_priv->gw_bandwidth);
+	else
+		batman_packet->gw_flags = 0;
+
+	atomic_inc(&batman_if->seqno);
+
+	slide_own_bcast_window(batman_if);
+	send_time = own_send_time(bat_priv);
+	add_bat_packet_to_list(bat_priv,
+			       batman_if->packet_buff,
+			       batman_if->packet_len,
+			       batman_if, 1, send_time);
+}
+
+void schedule_forward_packet(struct orig_node *orig_node,
+			     struct ethhdr *ethhdr,
+			     struct batman_packet *batman_packet,
+			     uint8_t directlink, int hna_buff_len,
+			     struct batman_if *if_incoming)
+{
+	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
+	unsigned char in_tq, in_ttl, tq_avg = 0;
+	unsigned long send_time;
+
+	if (batman_packet->ttl <= 1) {
+		bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n");
+		return;
+	}
+
+	in_tq = batman_packet->tq;
+	in_ttl = batman_packet->ttl;
+
+	batman_packet->ttl--;
+	memcpy(batman_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
+
+	/* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
+	 * of our best tq value */
+	if ((orig_node->router) && (orig_node->router->tq_avg != 0)) {
+
+		/* rebroadcast ogm of best ranking neighbor as is */
+		if (!compare_orig(orig_node->router->addr, ethhdr->h_source)) {
+			batman_packet->tq = orig_node->router->tq_avg;
+
+			if (orig_node->router->last_ttl)
+				batman_packet->ttl = orig_node->router->last_ttl
+							- 1;
+		}
+
+		tq_avg = orig_node->router->tq_avg;
+	}
+
+	/* apply hop penalty */
+	batman_packet->tq = hop_penalty(batman_packet->tq, bat_priv);
+
+	bat_dbg(DBG_BATMAN, bat_priv,
+		"Forwarding packet: tq_orig: %i, tq_avg: %i, "
+		"tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
+		in_tq, tq_avg, batman_packet->tq, in_ttl - 1,
+		batman_packet->ttl);
+
+	batman_packet->seqno = htonl(batman_packet->seqno);
+
+	/* switch of primaries first hop flag when forwarding */
+	batman_packet->flags &= ~PRIMARIES_FIRST_HOP;
+	if (directlink)
+		batman_packet->flags |= DIRECTLINK;
+	else
+		batman_packet->flags &= ~DIRECTLINK;
+
+	send_time = forward_send_time(bat_priv);
+	add_bat_packet_to_list(bat_priv,
+			       (unsigned char *)batman_packet,
+			       sizeof(struct batman_packet) + hna_buff_len,
+			       if_incoming, 0, send_time);
+}
+
+static void forw_packet_free(struct forw_packet *forw_packet)
+{
+	if (forw_packet->skb)
+		kfree_skb(forw_packet->skb);
+	kfree(forw_packet);
+}
+
+static void _add_bcast_packet_to_list(struct bat_priv *bat_priv,
+				      struct forw_packet *forw_packet,
+				      unsigned long send_time)
+{
+	INIT_HLIST_NODE(&forw_packet->list);
+
+	/* add new packet to packet list */
+	spin_lock_bh(&bat_priv->forw_bcast_list_lock);
+	hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list);
+	spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
+
+	/* start timer for this packet */
+	INIT_DELAYED_WORK(&forw_packet->delayed_work,
+			  send_outstanding_bcast_packet);
+	queue_delayed_work(bat_event_workqueue, &forw_packet->delayed_work,
+			   send_time);
+}
+
+#define atomic_dec_not_zero(v)          atomic_add_unless((v), -1, 0)
+/* add a broadcast packet to the queue and setup timers. broadcast packets
+ * are sent multiple times to increase probability for beeing received.
+ *
+ * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
+ * errors.
+ *
+ * The skb is not consumed, so the caller should make sure that the
+ * skb is freed. */
+int add_bcast_packet_to_list(struct bat_priv *bat_priv, struct sk_buff *skb)
+{
+	struct forw_packet *forw_packet;
+	struct bcast_packet *bcast_packet;
+
+	if (!atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
+		bat_dbg(DBG_BATMAN, bat_priv, "bcast packet queue full\n");
+		goto out;
+	}
+
+	if (!bat_priv->primary_if)
+		goto out;
+
+	forw_packet = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC);
+
+	if (!forw_packet)
+		goto out_and_inc;
+
+	skb = skb_copy(skb, GFP_ATOMIC);
+	if (!skb)
+		goto packet_free;
+
+	/* as we have a copy now, it is safe to decrease the TTL */
+	bcast_packet = (struct bcast_packet *)skb->data;
+	bcast_packet->ttl--;
+
+	skb_reset_mac_header(skb);
+
+	forw_packet->skb = skb;
+	forw_packet->if_incoming = bat_priv->primary_if;
+
+	/* how often did we send the bcast packet ? */
+	forw_packet->num_packets = 0;
+
+	_add_bcast_packet_to_list(bat_priv, forw_packet, 1);
+	return NETDEV_TX_OK;
+
+packet_free:
+	kfree(forw_packet);
+out_and_inc:
+	atomic_inc(&bat_priv->bcast_queue_left);
+out:
+	return NETDEV_TX_BUSY;
+}
+
+static void send_outstanding_bcast_packet(struct work_struct *work)
+{
+	struct batman_if *batman_if;
+	struct delayed_work *delayed_work =
+		container_of(work, struct delayed_work, work);
+	struct forw_packet *forw_packet =
+		container_of(delayed_work, struct forw_packet, delayed_work);
+	struct sk_buff *skb1;
+	struct net_device *soft_iface = forw_packet->if_incoming->soft_iface;
+	struct bat_priv *bat_priv = netdev_priv(soft_iface);
+
+	spin_lock_bh(&bat_priv->forw_bcast_list_lock);
+	hlist_del(&forw_packet->list);
+	spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
+
+	if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING)
+		goto out;
+
+	/* rebroadcast packet */
+	rcu_read_lock();
+	list_for_each_entry_rcu(batman_if, &if_list, list) {
+		if (batman_if->soft_iface != soft_iface)
+			continue;
+
+		/* send a copy of the saved skb */
+		skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
+		if (skb1)
+			send_skb_packet(skb1, batman_if, broadcast_addr);
+	}
+	rcu_read_unlock();
+
+	forw_packet->num_packets++;
+
+	/* if we still have some more bcasts to send */
+	if (forw_packet->num_packets < 3) {
+		_add_bcast_packet_to_list(bat_priv, forw_packet,
+					  ((5 * HZ) / 1000));
+		return;
+	}
+
+out:
+	forw_packet_free(forw_packet);
+	atomic_inc(&bat_priv->bcast_queue_left);
+}
+
+void send_outstanding_bat_packet(struct work_struct *work)
+{
+	struct delayed_work *delayed_work =
+		container_of(work, struct delayed_work, work);
+	struct forw_packet *forw_packet =
+		container_of(delayed_work, struct forw_packet, delayed_work);
+	struct bat_priv *bat_priv;
+
+	bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
+	spin_lock_bh(&bat_priv->forw_bat_list_lock);
+	hlist_del(&forw_packet->list);
+	spin_unlock_bh(&bat_priv->forw_bat_list_lock);
+
+	if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING)
+		goto out;
+
+	send_packet(forw_packet);
+
+	/**
+	 * we have to have at least one packet in the queue
+	 * to determine the queues wake up time unless we are
+	 * shutting down
+	 */
+	if (forw_packet->own)
+		schedule_own_packet(forw_packet->if_incoming);
+
+out:
+	/* don't count own packet */
+	if (!forw_packet->own)
+		atomic_inc(&bat_priv->batman_queue_left);
+
+	forw_packet_free(forw_packet);
+}
+
+void purge_outstanding_packets(struct bat_priv *bat_priv,
+			       struct batman_if *batman_if)
+{
+	struct forw_packet *forw_packet;
+	struct hlist_node *tmp_node, *safe_tmp_node;
+
+	if (batman_if)
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"purge_outstanding_packets(): %s\n",
+			batman_if->net_dev->name);
+	else
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"purge_outstanding_packets()\n");
+
+	/* free bcast list */
+	spin_lock_bh(&bat_priv->forw_bcast_list_lock);
+	hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
+				  &bat_priv->forw_bcast_list, list) {
+
+		/**
+		 * if purge_outstanding_packets() was called with an argmument
+		 * we delete only packets belonging to the given interface
+		 */
+		if ((batman_if) &&
+		    (forw_packet->if_incoming != batman_if))
+			continue;
+
+		spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
+
+		/**
+		 * send_outstanding_bcast_packet() will lock the list to
+		 * delete the item from the list
+		 */
+		cancel_delayed_work_sync(&forw_packet->delayed_work);
+		spin_lock_bh(&bat_priv->forw_bcast_list_lock);
+	}
+	spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
+
+	/* free batman packet list */
+	spin_lock_bh(&bat_priv->forw_bat_list_lock);
+	hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
+				  &bat_priv->forw_bat_list, list) {
+
+		/**
+		 * if purge_outstanding_packets() was called with an argmument
+		 * we delete only packets belonging to the given interface
+		 */
+		if ((batman_if) &&
+		    (forw_packet->if_incoming != batman_if))
+			continue;
+
+		spin_unlock_bh(&bat_priv->forw_bat_list_lock);
+
+		/**
+		 * send_outstanding_bat_packet() will lock the list to
+		 * delete the item from the list
+		 */
+		cancel_delayed_work_sync(&forw_packet->delayed_work);
+		spin_lock_bh(&bat_priv->forw_bat_list_lock);
+	}
+	spin_unlock_bh(&bat_priv->forw_bat_list_lock);
+}

net/batman-adv/send.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_SEND_H_
+#define _NET_BATMAN_ADV_SEND_H_
+
+#include "types.h"
+
+int send_skb_packet(struct sk_buff *skb,
+				struct batman_if *batman_if,
+				uint8_t *dst_addr);
+void schedule_own_packet(struct batman_if *batman_if);
+void schedule_forward_packet(struct orig_node *orig_node,
+			     struct ethhdr *ethhdr,
+			     struct batman_packet *batman_packet,
+			     uint8_t directlink, int hna_buff_len,
+			     struct batman_if *if_outgoing);
+int add_bcast_packet_to_list(struct bat_priv *bat_priv, struct sk_buff *skb);
+void send_outstanding_bat_packet(struct work_struct *work);
+void purge_outstanding_packets(struct bat_priv *bat_priv,
+			       struct batman_if *batman_if);
+
+#endif /* _NET_BATMAN_ADV_SEND_H_ */

net/batman-adv/soft-interface.c

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "soft-interface.h"
+#include "hard-interface.h"
+#include "routing.h"
+#include "send.h"
+#include "bat_debugfs.h"
+#include "translation-table.h"
+#include "types.h"
+#include "hash.h"
+#include "gateway_common.h"
+#include "gateway_client.h"
+#include "send.h"
+#include "bat_sysfs.h"
+#include <linux/slab.h>
+#include <linux/ethtool.h>
+#include <linux/etherdevice.h>
+#include <linux/if_vlan.h>
+#include "unicast.h"
+#include "routing.h"
+
+
+static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
+static void bat_get_drvinfo(struct net_device *dev,
+			    struct ethtool_drvinfo *info);
+static u32 bat_get_msglevel(struct net_device *dev);
+static void bat_set_msglevel(struct net_device *dev, u32 value);
+static u32 bat_get_link(struct net_device *dev);
+static u32 bat_get_rx_csum(struct net_device *dev);
+static int bat_set_rx_csum(struct net_device *dev, u32 data);
+
+static const struct ethtool_ops bat_ethtool_ops = {
+	.get_settings = bat_get_settings,
+	.get_drvinfo = bat_get_drvinfo,
+	.get_msglevel = bat_get_msglevel,
+	.set_msglevel = bat_set_msglevel,
+	.get_link = bat_get_link,
+	.get_rx_csum = bat_get_rx_csum,
+	.set_rx_csum = bat_set_rx_csum
+};
+
+int my_skb_head_push(struct sk_buff *skb, unsigned int len)
+{
+	int result;
+
+	/**
+	 * TODO: We must check if we can release all references to non-payload
+	 * data using skb_header_release in our skbs to allow skb_cow_header to
+	 * work optimally. This means that those skbs are not allowed to read
+	 * or write any data which is before the current position of skb->data
+	 * after that call and thus allow other skbs with the same data buffer
+	 * to write freely in that area.
+	 */
+	result = skb_cow_head(skb, len);
+	if (result < 0)
+		return result;
+
+	skb_push(skb, len);
+	return 0;
+}
+
+static void softif_neigh_free_ref(struct kref *refcount)
+{
+	struct softif_neigh *softif_neigh;
+
+	softif_neigh = container_of(refcount, struct softif_neigh, refcount);
+	kfree(softif_neigh);
+}
+
+static void softif_neigh_free_rcu(struct rcu_head *rcu)
+{
+	struct softif_neigh *softif_neigh;
+
+	softif_neigh = container_of(rcu, struct softif_neigh, rcu);
+	kref_put(&softif_neigh->refcount, softif_neigh_free_ref);
+}
+
+void softif_neigh_purge(struct bat_priv *bat_priv)
+{
+	struct softif_neigh *softif_neigh, *softif_neigh_tmp;
+	struct hlist_node *node, *node_tmp;
+
+	spin_lock_bh(&bat_priv->softif_neigh_lock);
+
+	hlist_for_each_entry_safe(softif_neigh, node, node_tmp,
+				  &bat_priv->softif_neigh_list, list) {
+
+		if ((!time_after(jiffies, softif_neigh->last_seen +
+				msecs_to_jiffies(SOFTIF_NEIGH_TIMEOUT))) &&
+		    (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE))
+			continue;
+
+		hlist_del_rcu(&softif_neigh->list);
+
+		if (bat_priv->softif_neigh == softif_neigh) {
+			bat_dbg(DBG_ROUTES, bat_priv,
+				 "Current mesh exit point '%pM' vanished "
+				 "(vid: %d).\n",
+				 softif_neigh->addr, softif_neigh->vid);
+			softif_neigh_tmp = bat_priv->softif_neigh;
+			bat_priv->softif_neigh = NULL;
+			kref_put(&softif_neigh_tmp->refcount,
+				 softif_neigh_free_ref);
+		}
+
+		call_rcu(&softif_neigh->rcu, softif_neigh_free_rcu);
+	}
+
+	spin_unlock_bh(&bat_priv->softif_neigh_lock);
+}
+
+static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
+					     uint8_t *addr, short vid)
+{
+	struct softif_neigh *softif_neigh;
+	struct hlist_node *node;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(softif_neigh, node,
+				 &bat_priv->softif_neigh_list, list) {
+		if (memcmp(softif_neigh->addr, addr, ETH_ALEN) != 0)
+			continue;
+
+		if (softif_neigh->vid != vid)
+			continue;
+
+		softif_neigh->last_seen = jiffies;
+		goto found;
+	}
+
+	softif_neigh = kzalloc(sizeof(struct softif_neigh), GFP_ATOMIC);
+	if (!softif_neigh)
+		goto out;
+
+	memcpy(softif_neigh->addr, addr, ETH_ALEN);
+	softif_neigh->vid = vid;
+	softif_neigh->last_seen = jiffies;
+	kref_init(&softif_neigh->refcount);
+
+	INIT_HLIST_NODE(&softif_neigh->list);
+	spin_lock_bh(&bat_priv->softif_neigh_lock);
+	hlist_add_head_rcu(&softif_neigh->list, &bat_priv->softif_neigh_list);
+	spin_unlock_bh(&bat_priv->softif_neigh_lock);
+
+found:
+	kref_get(&softif_neigh->refcount);
+out:
+	rcu_read_unlock();
+	return softif_neigh;
+}
+
+int softif_neigh_seq_print_text(struct seq_file *seq, void *offset)
+{
+	struct net_device *net_dev = (struct net_device *)seq->private;
+	struct bat_priv *bat_priv = netdev_priv(net_dev);
+	struct softif_neigh *softif_neigh;
+	struct hlist_node *node;
+	size_t buf_size, pos;
+	char *buff;
+
+	if (!bat_priv->primary_if) {
+		return seq_printf(seq, "BATMAN mesh %s disabled - "
+			       "please specify interfaces to enable it\n",
+			       net_dev->name);
+	}
+
+	seq_printf(seq, "Softif neighbor list (%s)\n", net_dev->name);
+
+	buf_size = 1;
+	/* Estimate length for: "   xx:xx:xx:xx:xx:xx\n" */
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(softif_neigh, node,
+				 &bat_priv->softif_neigh_list, list)
+		buf_size += 30;
+	rcu_read_unlock();
+
+	buff = kmalloc(buf_size, GFP_ATOMIC);
+	if (!buff)
+		return -ENOMEM;
+
+	buff[0] = '\0';
+	pos = 0;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(softif_neigh, node,
+				 &bat_priv->softif_neigh_list, list) {
+		pos += snprintf(buff + pos, 31, "%s %pM (vid: %d)\n",
+				bat_priv->softif_neigh == softif_neigh
+				? "=>" : "  ", softif_neigh->addr,
+				softif_neigh->vid);
+	}
+	rcu_read_unlock();
+
+	seq_printf(seq, "%s", buff);
+	kfree(buff);
+	return 0;
+}
+
+static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
+			       short vid)
+{
+	struct bat_priv *bat_priv = netdev_priv(dev);
+	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
+	struct batman_packet *batman_packet;
+	struct softif_neigh *softif_neigh, *softif_neigh_tmp;
+
+	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q)
+		batman_packet = (struct batman_packet *)
+					(skb->data + ETH_HLEN + VLAN_HLEN);
+	else
+		batman_packet = (struct batman_packet *)(skb->data + ETH_HLEN);
+
+	if (batman_packet->version != COMPAT_VERSION)
+		goto err;
+
+	if (batman_packet->packet_type != BAT_PACKET)
+		goto err;
+
+	if (!(batman_packet->flags & PRIMARIES_FIRST_HOP))
+		goto err;
+
+	if (is_my_mac(batman_packet->orig))
+		goto err;
+
+	softif_neigh = softif_neigh_get(bat_priv, batman_packet->orig, vid);
+
+	if (!softif_neigh)
+		goto err;
+
+	if (bat_priv->softif_neigh == softif_neigh)
+		goto out;
+
+	/* we got a neighbor but its mac is 'bigger' than ours  */
+	if (memcmp(bat_priv->primary_if->net_dev->dev_addr,
+		   softif_neigh->addr, ETH_ALEN) < 0)
+		goto out;
+
+	/* switch to new 'smallest neighbor' */
+	if ((bat_priv->softif_neigh) &&
+	    (memcmp(softif_neigh->addr, bat_priv->softif_neigh->addr,
+							ETH_ALEN) < 0)) {
+		bat_dbg(DBG_ROUTES, bat_priv,
+			"Changing mesh exit point from %pM (vid: %d) "
+			"to %pM (vid: %d).\n",
+			 bat_priv->softif_neigh->addr,
+			 bat_priv->softif_neigh->vid,
+			 softif_neigh->addr, softif_neigh->vid);
+		softif_neigh_tmp = bat_priv->softif_neigh;
+		bat_priv->softif_neigh = softif_neigh;
+		kref_put(&softif_neigh_tmp->refcount, softif_neigh_free_ref);
+		/* we need to hold the additional reference */
+		goto err;
+	}
+
+	/* close own batX device and use softif_neigh as exit node */
+	if ((!bat_priv->softif_neigh) &&
+	    (memcmp(softif_neigh->addr,
+		    bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN) < 0)) {
+		bat_dbg(DBG_ROUTES, bat_priv,
+			"Setting mesh exit point to %pM (vid: %d).\n",
+			softif_neigh->addr, softif_neigh->vid);
+		bat_priv->softif_neigh = softif_neigh;
+		/* we need to hold the additional reference */
+		goto err;
+	}
+
+out:
+	kref_put(&softif_neigh->refcount, softif_neigh_free_ref);
+err:
+	kfree_skb(skb);
+	return;
+}
+
+static int interface_open(struct net_device *dev)
+{
+	netif_start_queue(dev);
+	return 0;
+}
+
+static int interface_release(struct net_device *dev)
+{
+	netif_stop_queue(dev);
+	return 0;
+}
+
+static struct net_device_stats *interface_stats(struct net_device *dev)
+{
+	struct bat_priv *bat_priv = netdev_priv(dev);
+	return &bat_priv->stats;
+}
+
+static int interface_set_mac_addr(struct net_device *dev, void *p)
+{
+	struct bat_priv *bat_priv = netdev_priv(dev);
+	struct sockaddr *addr = p;
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	/* only modify hna-table if it has been initialised before */
+	if (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) {
+		hna_local_remove(bat_priv, dev->dev_addr,
+				 "mac address changed");
+		hna_local_add(dev, addr->sa_data);
+	}
+
+	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
+	return 0;
+}
+
+static int interface_change_mtu(struct net_device *dev, int new_mtu)
+{
+	/* check ranges */
+	if ((new_mtu < 68) || (new_mtu > hardif_min_mtu(dev)))
+		return -EINVAL;
+
+	dev->mtu = new_mtu;
+
+	return 0;
+}
+
+int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
+{
+	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
+	struct bat_priv *bat_priv = netdev_priv(soft_iface);
+	struct bcast_packet *bcast_packet;
+	struct vlan_ethhdr *vhdr;
+	int data_len = skb->len, ret;
+	short vid = -1;
+	bool do_bcast = false;
+
+	if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
+		goto dropped;
+
+	soft_iface->trans_start = jiffies;
+
+	switch (ntohs(ethhdr->h_proto)) {
+	case ETH_P_8021Q:
+		vhdr = (struct vlan_ethhdr *)skb->data;
+		vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
+
+		if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
+			break;
+
+		/* fall through */
+	case ETH_P_BATMAN:
+		softif_batman_recv(skb, soft_iface, vid);
+		goto end;
+	}
+
+	/**
+	 * if we have a another chosen mesh exit node in range
+	 * it will transport the packets to the mesh
+	 */
+	if ((bat_priv->softif_neigh) && (bat_priv->softif_neigh->vid == vid))
+		goto dropped;
+
+	/* TODO: check this for locks */
+	hna_local_add(soft_iface, ethhdr->h_source);
+
+	if (is_multicast_ether_addr(ethhdr->h_dest)) {
+		ret = gw_is_target(bat_priv, skb);
+
+		if (ret < 0)
+			goto dropped;
+
+		if (ret == 0)
+			do_bcast = true;
+	}
+
+	/* ethernet packet should be broadcasted */
+	if (do_bcast) {
+		if (!bat_priv->primary_if)
+			goto dropped;
+
+		if (my_skb_head_push(skb, sizeof(struct bcast_packet)) < 0)
+			goto dropped;
+
+		bcast_packet = (struct bcast_packet *)skb->data;
+		bcast_packet->version = COMPAT_VERSION;
+		bcast_packet->ttl = TTL;
+
+		/* batman packet type: broadcast */
+		bcast_packet->packet_type = BAT_BCAST;
+
+		/* hw address of first interface is the orig mac because only
+		 * this mac is known throughout the mesh */
+		memcpy(bcast_packet->orig,
+		       bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+
+		/* set broadcast sequence number */
+		bcast_packet->seqno =
+			htonl(atomic_inc_return(&bat_priv->bcast_seqno));
+
+		add_bcast_packet_to_list(bat_priv, skb);
+
+		/* a copy is stored in the bcast list, therefore removing
+		 * the original skb. */
+		kfree_skb(skb);
+
+	/* unicast packet */
+	} else {
+		ret = unicast_send_skb(skb, bat_priv);
+		if (ret != 0)
+			goto dropped_freed;
+	}
+
+	bat_priv->stats.tx_packets++;
+	bat_priv->stats.tx_bytes += data_len;
+	goto end;
+
+dropped:
+	kfree_skb(skb);
+dropped_freed:
+	bat_priv->stats.tx_dropped++;
+end:
+	return NETDEV_TX_OK;
+}
+
+void interface_rx(struct net_device *soft_iface,
+		  struct sk_buff *skb, struct batman_if *recv_if,
+		  int hdr_size)
+{
+	struct bat_priv *bat_priv = netdev_priv(soft_iface);
+	struct unicast_packet *unicast_packet;
+	struct ethhdr *ethhdr;
+	struct vlan_ethhdr *vhdr;
+	short vid = -1;
+	int ret;
+
+	/* check if enough space is available for pulling, and pull */
+	if (!pskb_may_pull(skb, hdr_size))
+		goto dropped;
+
+	skb_pull_rcsum(skb, hdr_size);
+	skb_reset_mac_header(skb);
+
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	switch (ntohs(ethhdr->h_proto)) {
+	case ETH_P_8021Q:
+		vhdr = (struct vlan_ethhdr *)skb->data;
+		vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
+
+		if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
+			break;
+
+		/* fall through */
+	case ETH_P_BATMAN:
+		goto dropped;
+	}
+
+	/**
+	 * if we have a another chosen mesh exit node in range
+	 * it will transport the packets to the non-mesh network
+	 */
+	if ((bat_priv->softif_neigh) && (bat_priv->softif_neigh->vid == vid)) {
+		skb_push(skb, hdr_size);
+		unicast_packet = (struct unicast_packet *)skb->data;
+
+		if ((unicast_packet->packet_type != BAT_UNICAST) &&
+		    (unicast_packet->packet_type != BAT_UNICAST_FRAG))
+			goto dropped;
+
+		skb_reset_mac_header(skb);
+
+		memcpy(unicast_packet->dest,
+		       bat_priv->softif_neigh->addr, ETH_ALEN);
+		ret = route_unicast_packet(skb, recv_if, hdr_size);
+		if (ret == NET_RX_DROP)
+			goto dropped;
+
+		goto out;
+	}
+
+	/* skb->dev & skb->pkt_type are set here */
+	if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
+		goto dropped;
+	skb->protocol = eth_type_trans(skb, soft_iface);
+
+	/* should not be neccesary anymore as we use skb_pull_rcsum()
+	 * TODO: please verify this and remove this TODO
+	 * -- Dec 21st 2009, Simon Wunderlich */
+
+/*	skb->ip_summed = CHECKSUM_UNNECESSARY;*/
+
+	bat_priv->stats.rx_packets++;
+	bat_priv->stats.rx_bytes += skb->len + sizeof(struct ethhdr);
+
+	soft_iface->last_rx = jiffies;
+
+	netif_rx(skb);
+	return;
+
+dropped:
+	kfree_skb(skb);
+out:
+	return;
+}
+
+#ifdef HAVE_NET_DEVICE_OPS
+static const struct net_device_ops bat_netdev_ops = {
+	.ndo_open = interface_open,
+	.ndo_stop = interface_release,
+	.ndo_get_stats = interface_stats,
+	.ndo_set_mac_address = interface_set_mac_addr,
+	.ndo_change_mtu = interface_change_mtu,
+	.ndo_start_xmit = interface_tx,
+	.ndo_validate_addr = eth_validate_addr
+};
+#endif
+
+static void interface_setup(struct net_device *dev)
+{
+	struct bat_priv *priv = netdev_priv(dev);
+	char dev_addr[ETH_ALEN];
+
+	ether_setup(dev);
+
+#ifdef HAVE_NET_DEVICE_OPS
+	dev->netdev_ops = &bat_netdev_ops;
+#else
+	dev->open = interface_open;
+	dev->stop = interface_release;
+	dev->get_stats = interface_stats;
+	dev->set_mac_address = interface_set_mac_addr;
+	dev->change_mtu = interface_change_mtu;
+	dev->hard_start_xmit = interface_tx;
+#endif
+	dev->destructor = free_netdev;
+
+	/**
+	 * can't call min_mtu, because the needed variables
+	 * have not been initialized yet
+	 */
+	dev->mtu = ETH_DATA_LEN;
+	dev->hard_header_len = BAT_HEADER_LEN; /* reserve more space in the
+						* skbuff for our header */
+
+	/* generate random address */
+	random_ether_addr(dev_addr);
+	memcpy(dev->dev_addr, dev_addr, ETH_ALEN);
+
+	SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
+
+	memset(priv, 0, sizeof(struct bat_priv));
+}
+
+struct net_device *softif_create(char *name)
+{
+	struct net_device *soft_iface;
+	struct bat_priv *bat_priv;
+	int ret;
+
+	soft_iface = alloc_netdev(sizeof(struct bat_priv) , name,
+				   interface_setup);
+
+	if (!soft_iface) {
+		pr_err("Unable to allocate the batman interface: %s\n", name);
+		goto out;
+	}
+
+	ret = register_netdev(soft_iface);
+	if (ret < 0) {
+		pr_err("Unable to register the batman interface '%s': %i\n",
+		       name, ret);
+		goto free_soft_iface;
+	}
+
+	bat_priv = netdev_priv(soft_iface);
+
+	atomic_set(&bat_priv->aggregated_ogms, 1);
+	atomic_set(&bat_priv->bonding, 0);
+	atomic_set(&bat_priv->vis_mode, VIS_TYPE_CLIENT_UPDATE);
+	atomic_set(&bat_priv->gw_mode, GW_MODE_OFF);
+	atomic_set(&bat_priv->gw_sel_class, 20);
+	atomic_set(&bat_priv->gw_bandwidth, 41);
+	atomic_set(&bat_priv->orig_interval, 1000);
+	atomic_set(&bat_priv->hop_penalty, 10);
+	atomic_set(&bat_priv->log_level, 0);
+	atomic_set(&bat_priv->fragmentation, 1);
+	atomic_set(&bat_priv->bcast_queue_left, BCAST_QUEUE_LEN);
+	atomic_set(&bat_priv->batman_queue_left, BATMAN_QUEUE_LEN);
+
+	atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
+	atomic_set(&bat_priv->bcast_seqno, 1);
+	atomic_set(&bat_priv->hna_local_changed, 0);
+
+	bat_priv->primary_if = NULL;
+	bat_priv->num_ifaces = 0;
+	bat_priv->softif_neigh = NULL;
+
+	ret = sysfs_add_meshif(soft_iface);
+	if (ret < 0)
+		goto unreg_soft_iface;
+
+	ret = debugfs_add_meshif(soft_iface);
+	if (ret < 0)
+		goto unreg_sysfs;
+
+	ret = mesh_init(soft_iface);
+	if (ret < 0)
+		goto unreg_debugfs;
+
+	return soft_iface;
+
+unreg_debugfs:
+	debugfs_del_meshif(soft_iface);
+unreg_sysfs:
+	sysfs_del_meshif(soft_iface);
+unreg_soft_iface:
+	unregister_netdev(soft_iface);
+	return NULL;
+
+free_soft_iface:
+	free_netdev(soft_iface);
+out:
+	return NULL;
+}
+
+void softif_destroy(struct net_device *soft_iface)
+{
+	debugfs_del_meshif(soft_iface);
+	sysfs_del_meshif(soft_iface);
+	mesh_free(soft_iface);
+	unregister_netdevice(soft_iface);
+}
+
+/* ethtool */
+static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	cmd->supported = 0;
+	cmd->advertising = 0;
+	cmd->speed = SPEED_10;
+	cmd->duplex = DUPLEX_FULL;
+	cmd->port = PORT_TP;
+	cmd->phy_address = 0;
+	cmd->transceiver = XCVR_INTERNAL;
+	cmd->autoneg = AUTONEG_DISABLE;
+	cmd->maxtxpkt = 0;
+	cmd->maxrxpkt = 0;
+
+	return 0;
+}
+
+static void bat_get_drvinfo(struct net_device *dev,
+			    struct ethtool_drvinfo *info)
+{
+	strcpy(info->driver, "B.A.T.M.A.N. advanced");
+	strcpy(info->version, SOURCE_VERSION);
+	strcpy(info->fw_version, "N/A");
+	strcpy(info->bus_info, "batman");
+}
+
+static u32 bat_get_msglevel(struct net_device *dev)
+{
+	return -EOPNOTSUPP;
+}
+
+static void bat_set_msglevel(struct net_device *dev, u32 value)
+{
+}
+
+static u32 bat_get_link(struct net_device *dev)
+{
+	return 1;
+}
+
+static u32 bat_get_rx_csum(struct net_device *dev)
+{
+	return 0;
+}
+
+static int bat_set_rx_csum(struct net_device *dev, u32 data)
+{
+	return -EOPNOTSUPP;
+}

net/batman-adv/soft-interface.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_SOFT_INTERFACE_H_
+#define _NET_BATMAN_ADV_SOFT_INTERFACE_H_
+
+int my_skb_head_push(struct sk_buff *skb, unsigned int len);
+int softif_neigh_seq_print_text(struct seq_file *seq, void *offset);
+void softif_neigh_purge(struct bat_priv *bat_priv);
+int interface_tx(struct sk_buff *skb, struct net_device *soft_iface);
+void interface_rx(struct net_device *soft_iface,
+		  struct sk_buff *skb, struct batman_if *recv_if,
+		  int hdr_size);
+struct net_device *softif_create(char *name);
+void softif_destroy(struct net_device *soft_iface);
+
+#endif /* _NET_BATMAN_ADV_SOFT_INTERFACE_H_ */

net/batman-adv/translation-table.c

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "translation-table.h"
+#include "soft-interface.h"
+#include "types.h"
+#include "hash.h"
+#include "originator.h"
+
+static void hna_local_purge(struct work_struct *work);
+static void _hna_global_del_orig(struct bat_priv *bat_priv,
+				 struct hna_global_entry *hna_global_entry,
+				 char *message);
+
+static void hna_local_start_timer(struct bat_priv *bat_priv)
+{
+	INIT_DELAYED_WORK(&bat_priv->hna_work, hna_local_purge);
+	queue_delayed_work(bat_event_workqueue, &bat_priv->hna_work, 10 * HZ);
+}
+
+int hna_local_init(struct bat_priv *bat_priv)
+{
+	if (bat_priv->hna_local_hash)
+		return 1;
+
+	bat_priv->hna_local_hash = hash_new(1024);
+
+	if (!bat_priv->hna_local_hash)
+		return 0;
+
+	atomic_set(&bat_priv->hna_local_changed, 0);
+	hna_local_start_timer(bat_priv);
+
+	return 1;
+}
+
+void hna_local_add(struct net_device *soft_iface, uint8_t *addr)
+{
+	struct bat_priv *bat_priv = netdev_priv(soft_iface);
+	struct hna_local_entry *hna_local_entry;
+	struct hna_global_entry *hna_global_entry;
+	int required_bytes;
+
+	spin_lock_bh(&bat_priv->hna_lhash_lock);
+	hna_local_entry =
+		((struct hna_local_entry *)hash_find(bat_priv->hna_local_hash,
+						     compare_orig, choose_orig,
+						     addr));
+	spin_unlock_bh(&bat_priv->hna_lhash_lock);
+
+	if (hna_local_entry) {
+		hna_local_entry->last_seen = jiffies;
+		return;
+	}
+
+	/* only announce as many hosts as possible in the batman-packet and
+	   space in batman_packet->num_hna That also should give a limit to
+	   MAC-flooding. */
+	required_bytes = (bat_priv->num_local_hna + 1) * ETH_ALEN;
+	required_bytes += BAT_PACKET_LEN;
+
+	if ((required_bytes > ETH_DATA_LEN) ||
+	    (atomic_read(&bat_priv->aggregated_ogms) &&
+	     required_bytes > MAX_AGGREGATION_BYTES) ||
+	    (bat_priv->num_local_hna + 1 > 255)) {
+		bat_dbg(DBG_ROUTES, bat_priv,
+			"Can't add new local hna entry (%pM): "
+			"number of local hna entries exceeds packet size\n",
+			addr);
+		return;
+	}
+
+	bat_dbg(DBG_ROUTES, bat_priv,
+		"Creating new local hna entry: %pM\n", addr);
+
+	hna_local_entry = kmalloc(sizeof(struct hna_local_entry), GFP_ATOMIC);
+	if (!hna_local_entry)
+		return;
+
+	memcpy(hna_local_entry->addr, addr, ETH_ALEN);
+	hna_local_entry->last_seen = jiffies;
+
+	/* the batman interface mac address should never be purged */
+	if (compare_orig(addr, soft_iface->dev_addr))
+		hna_local_entry->never_purge = 1;
+	else
+		hna_local_entry->never_purge = 0;
+
+	spin_lock_bh(&bat_priv->hna_lhash_lock);
+
+	hash_add(bat_priv->hna_local_hash, compare_orig, choose_orig,
+		 hna_local_entry);
+	bat_priv->num_local_hna++;
+	atomic_set(&bat_priv->hna_local_changed, 1);
+
+	spin_unlock_bh(&bat_priv->hna_lhash_lock);
+
+	/* remove address from global hash if present */
+	spin_lock_bh(&bat_priv->hna_ghash_lock);
+
+	hna_global_entry = ((struct hna_global_entry *)
+				hash_find(bat_priv->hna_global_hash,
+					  compare_orig, choose_orig, addr));
+
+	if (hna_global_entry)
+		_hna_global_del_orig(bat_priv, hna_global_entry,
+				     "local hna received");
+
+	spin_unlock_bh(&bat_priv->hna_ghash_lock);
+}
+
+int hna_local_fill_buffer(struct bat_priv *bat_priv,
+			  unsigned char *buff, int buff_len)
+{
+	struct hashtable_t *hash = bat_priv->hna_local_hash;
+	struct hna_local_entry *hna_local_entry;
+	struct element_t *bucket;
+	int i;
+	struct hlist_node *walk;
+	struct hlist_head *head;
+	int count = 0;
+
+	spin_lock_bh(&bat_priv->hna_lhash_lock);
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry(bucket, walk, head, hlist) {
+
+			if (buff_len < (count + 1) * ETH_ALEN)
+				break;
+
+			hna_local_entry = bucket->data;
+			memcpy(buff + (count * ETH_ALEN), hna_local_entry->addr,
+			       ETH_ALEN);
+
+			count++;
+		}
+	}
+
+	/* if we did not get all new local hnas see you next time  ;-) */
+	if (count == bat_priv->num_local_hna)
+		atomic_set(&bat_priv->hna_local_changed, 0);
+
+	spin_unlock_bh(&bat_priv->hna_lhash_lock);
+	return i;
+}
+
+int hna_local_seq_print_text(struct seq_file *seq, void *offset)
+{
+	struct net_device *net_dev = (struct net_device *)seq->private;
+	struct bat_priv *bat_priv = netdev_priv(net_dev);
+	struct hashtable_t *hash = bat_priv->hna_local_hash;
+	struct hna_local_entry *hna_local_entry;
+	int i;
+	struct hlist_node *walk;
+	struct hlist_head *head;
+	struct element_t *bucket;
+	size_t buf_size, pos;
+	char *buff;
+
+	if (!bat_priv->primary_if) {
+		return seq_printf(seq, "BATMAN mesh %s disabled - "
+			       "please specify interfaces to enable it\n",
+			       net_dev->name);
+	}
+
+	seq_printf(seq, "Locally retrieved addresses (from %s) "
+		   "announced via HNA:\n",
+		   net_dev->name);
+
+	spin_lock_bh(&bat_priv->hna_lhash_lock);
+
+	buf_size = 1;
+	/* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each(walk, head)
+			buf_size += 21;
+	}
+
+	buff = kmalloc(buf_size, GFP_ATOMIC);
+	if (!buff) {
+		spin_unlock_bh(&bat_priv->hna_lhash_lock);
+		return -ENOMEM;
+	}
+	buff[0] = '\0';
+	pos = 0;
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry(bucket, walk, head, hlist) {
+			hna_local_entry = bucket->data;
+
+			pos += snprintf(buff + pos, 22, " * %pM\n",
+					hna_local_entry->addr);
+		}
+	}
+
+	spin_unlock_bh(&bat_priv->hna_lhash_lock);
+
+	seq_printf(seq, "%s", buff);
+	kfree(buff);
+	return 0;
+}
+
+static void _hna_local_del(void *data, void *arg)
+{
+	struct bat_priv *bat_priv = (struct bat_priv *)arg;
+
+	kfree(data);
+	bat_priv->num_local_hna--;
+	atomic_set(&bat_priv->hna_local_changed, 1);
+}
+
+static void hna_local_del(struct bat_priv *bat_priv,
+			  struct hna_local_entry *hna_local_entry,
+			  char *message)
+{
+	bat_dbg(DBG_ROUTES, bat_priv, "Deleting local hna entry (%pM): %s\n",
+		hna_local_entry->addr, message);
+
+	hash_remove(bat_priv->hna_local_hash, compare_orig, choose_orig,
+		    hna_local_entry->addr);
+	_hna_local_del(hna_local_entry, bat_priv);
+}
+
+void hna_local_remove(struct bat_priv *bat_priv,
+		      uint8_t *addr, char *message)
+{
+	struct hna_local_entry *hna_local_entry;
+
+	spin_lock_bh(&bat_priv->hna_lhash_lock);
+
+	hna_local_entry = (struct hna_local_entry *)
+		hash_find(bat_priv->hna_local_hash, compare_orig, choose_orig,
+			  addr);
+
+	if (hna_local_entry)
+		hna_local_del(bat_priv, hna_local_entry, message);
+
+	spin_unlock_bh(&bat_priv->hna_lhash_lock);
+}
+
+static void hna_local_purge(struct work_struct *work)
+{
+	struct delayed_work *delayed_work =
+		container_of(work, struct delayed_work, work);
+	struct bat_priv *bat_priv =
+		container_of(delayed_work, struct bat_priv, hna_work);
+	struct hashtable_t *hash = bat_priv->hna_local_hash;
+	struct hna_local_entry *hna_local_entry;
+	int i;
+	struct hlist_node *walk, *safe;
+	struct hlist_head *head;
+	struct element_t *bucket;
+	unsigned long timeout;
+
+	spin_lock_bh(&bat_priv->hna_lhash_lock);
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry_safe(bucket, walk, safe, head, hlist) {
+			hna_local_entry = bucket->data;
+
+			timeout = hna_local_entry->last_seen;
+			timeout += LOCAL_HNA_TIMEOUT * HZ;
+
+			if ((!hna_local_entry->never_purge) &&
+			    time_after(jiffies, timeout))
+				hna_local_del(bat_priv, hna_local_entry,
+					"address timed out");
+		}
+	}
+
+	spin_unlock_bh(&bat_priv->hna_lhash_lock);
+	hna_local_start_timer(bat_priv);
+}
+
+void hna_local_free(struct bat_priv *bat_priv)
+{
+	if (!bat_priv->hna_local_hash)
+		return;
+
+	cancel_delayed_work_sync(&bat_priv->hna_work);
+	hash_delete(bat_priv->hna_local_hash, _hna_local_del, bat_priv);
+	bat_priv->hna_local_hash = NULL;
+}
+
+int hna_global_init(struct bat_priv *bat_priv)
+{
+	if (bat_priv->hna_global_hash)
+		return 1;
+
+	bat_priv->hna_global_hash = hash_new(1024);
+
+	if (!bat_priv->hna_global_hash)
+		return 0;
+
+	return 1;
+}
+
+void hna_global_add_orig(struct bat_priv *bat_priv,
+			 struct orig_node *orig_node,
+			 unsigned char *hna_buff, int hna_buff_len)
+{
+	struct hna_global_entry *hna_global_entry;
+	struct hna_local_entry *hna_local_entry;
+	int hna_buff_count = 0;
+	unsigned char *hna_ptr;
+
+	while ((hna_buff_count + 1) * ETH_ALEN <= hna_buff_len) {
+		spin_lock_bh(&bat_priv->hna_ghash_lock);
+
+		hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
+		hna_global_entry = (struct hna_global_entry *)
+			hash_find(bat_priv->hna_global_hash, compare_orig,
+				  choose_orig, hna_ptr);
+
+		if (!hna_global_entry) {
+			spin_unlock_bh(&bat_priv->hna_ghash_lock);
+
+			hna_global_entry =
+				kmalloc(sizeof(struct hna_global_entry),
+					GFP_ATOMIC);
+
+			if (!hna_global_entry)
+				break;
+
+			memcpy(hna_global_entry->addr, hna_ptr, ETH_ALEN);
+
+			bat_dbg(DBG_ROUTES, bat_priv,
+				"Creating new global hna entry: "
+				"%pM (via %pM)\n",
+				hna_global_entry->addr, orig_node->orig);
+
+			spin_lock_bh(&bat_priv->hna_ghash_lock);
+			hash_add(bat_priv->hna_global_hash, compare_orig,
+				 choose_orig, hna_global_entry);
+
+		}
+
+		hna_global_entry->orig_node = orig_node;
+		spin_unlock_bh(&bat_priv->hna_ghash_lock);
+
+		/* remove address from local hash if present */
+		spin_lock_bh(&bat_priv->hna_lhash_lock);
+
+		hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
+		hna_local_entry = (struct hna_local_entry *)
+			hash_find(bat_priv->hna_local_hash, compare_orig,
+				  choose_orig, hna_ptr);
+
+		if (hna_local_entry)
+			hna_local_del(bat_priv, hna_local_entry,
+				      "global hna received");
+
+		spin_unlock_bh(&bat_priv->hna_lhash_lock);
+
+		hna_buff_count++;
+	}
+
+	/* initialize, and overwrite if malloc succeeds */
+	orig_node->hna_buff = NULL;
+	orig_node->hna_buff_len = 0;
+
+	if (hna_buff_len > 0) {
+		orig_node->hna_buff = kmalloc(hna_buff_len, GFP_ATOMIC);
+		if (orig_node->hna_buff) {
+			memcpy(orig_node->hna_buff, hna_buff, hna_buff_len);
+			orig_node->hna_buff_len = hna_buff_len;
+		}
+	}
+}
+
+int hna_global_seq_print_text(struct seq_file *seq, void *offset)
+{
+	struct net_device *net_dev = (struct net_device *)seq->private;
+	struct bat_priv *bat_priv = netdev_priv(net_dev);
+	struct hashtable_t *hash = bat_priv->hna_global_hash;
+	struct hna_global_entry *hna_global_entry;
+	int i;
+	struct hlist_node *walk;
+	struct hlist_head *head;
+	struct element_t *bucket;
+	size_t buf_size, pos;
+	char *buff;
+
+	if (!bat_priv->primary_if) {
+		return seq_printf(seq, "BATMAN mesh %s disabled - "
+				  "please specify interfaces to enable it\n",
+				  net_dev->name);
+	}
+
+	seq_printf(seq, "Globally announced HNAs received via the mesh %s\n",
+		   net_dev->name);
+
+	spin_lock_bh(&bat_priv->hna_ghash_lock);
+
+	buf_size = 1;
+	/* Estimate length for: " * xx:xx:xx:xx:xx:xx via xx:xx:xx:xx:xx:xx\n"*/
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each(walk, head)
+			buf_size += 43;
+	}
+
+	buff = kmalloc(buf_size, GFP_ATOMIC);
+	if (!buff) {
+		spin_unlock_bh(&bat_priv->hna_ghash_lock);
+		return -ENOMEM;
+	}
+	buff[0] = '\0';
+	pos = 0;
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry(bucket, walk, head, hlist) {
+			hna_global_entry = bucket->data;
+
+			pos += snprintf(buff + pos, 44,
+					" * %pM via %pM\n",
+					hna_global_entry->addr,
+					hna_global_entry->orig_node->orig);
+		}
+	}
+
+	spin_unlock_bh(&bat_priv->hna_ghash_lock);
+
+	seq_printf(seq, "%s", buff);
+	kfree(buff);
+	return 0;
+}
+
+static void _hna_global_del_orig(struct bat_priv *bat_priv,
+				 struct hna_global_entry *hna_global_entry,
+				 char *message)
+{
+	bat_dbg(DBG_ROUTES, bat_priv,
+		"Deleting global hna entry %pM (via %pM): %s\n",
+		hna_global_entry->addr, hna_global_entry->orig_node->orig,
+		message);
+
+	hash_remove(bat_priv->hna_global_hash, compare_orig, choose_orig,
+		    hna_global_entry->addr);
+	kfree(hna_global_entry);
+}
+
+void hna_global_del_orig(struct bat_priv *bat_priv,
+			 struct orig_node *orig_node, char *message)
+{
+	struct hna_global_entry *hna_global_entry;
+	int hna_buff_count = 0;
+	unsigned char *hna_ptr;
+
+	if (orig_node->hna_buff_len == 0)
+		return;
+
+	spin_lock_bh(&bat_priv->hna_ghash_lock);
+
+	while ((hna_buff_count + 1) * ETH_ALEN <= orig_node->hna_buff_len) {
+		hna_ptr = orig_node->hna_buff + (hna_buff_count * ETH_ALEN);
+		hna_global_entry = (struct hna_global_entry *)
+			hash_find(bat_priv->hna_global_hash, compare_orig,
+				  choose_orig, hna_ptr);
+
+		if ((hna_global_entry) &&
+		    (hna_global_entry->orig_node == orig_node))
+			_hna_global_del_orig(bat_priv, hna_global_entry,
+					     message);
+
+		hna_buff_count++;
+	}
+
+	spin_unlock_bh(&bat_priv->hna_ghash_lock);
+
+	orig_node->hna_buff_len = 0;
+	kfree(orig_node->hna_buff);
+	orig_node->hna_buff = NULL;
+}
+
+static void hna_global_del(void *data, void *arg)
+{
+	kfree(data);
+}
+
+void hna_global_free(struct bat_priv *bat_priv)
+{
+	if (!bat_priv->hna_global_hash)
+		return;
+
+	hash_delete(bat_priv->hna_global_hash, hna_global_del, NULL);
+	bat_priv->hna_global_hash = NULL;
+}
+
+struct orig_node *transtable_search(struct bat_priv *bat_priv, uint8_t *addr)
+{
+	struct hna_global_entry *hna_global_entry;
+
+	spin_lock_bh(&bat_priv->hna_ghash_lock);
+	hna_global_entry = (struct hna_global_entry *)
+				hash_find(bat_priv->hna_global_hash,
+					  compare_orig, choose_orig, addr);
+	spin_unlock_bh(&bat_priv->hna_ghash_lock);
+
+	if (!hna_global_entry)
+		return NULL;
+
+	return hna_global_entry->orig_node;
+}

net/batman-adv/translation-table.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_TRANSLATION_TABLE_H_
+#define _NET_BATMAN_ADV_TRANSLATION_TABLE_H_
+
+#include "types.h"
+
+int hna_local_init(struct bat_priv *bat_priv);
+void hna_local_add(struct net_device *soft_iface, uint8_t *addr);
+void hna_local_remove(struct bat_priv *bat_priv,
+		      uint8_t *addr, char *message);
+int hna_local_fill_buffer(struct bat_priv *bat_priv,
+			  unsigned char *buff, int buff_len);
+int hna_local_seq_print_text(struct seq_file *seq, void *offset);
+void hna_local_free(struct bat_priv *bat_priv);
+int hna_global_init(struct bat_priv *bat_priv);
+void hna_global_add_orig(struct bat_priv *bat_priv,
+			 struct orig_node *orig_node,
+			 unsigned char *hna_buff, int hna_buff_len);
+int hna_global_seq_print_text(struct seq_file *seq, void *offset);
+void hna_global_del_orig(struct bat_priv *bat_priv,
+			 struct orig_node *orig_node, char *message);
+void hna_global_free(struct bat_priv *bat_priv);
+struct orig_node *transtable_search(struct bat_priv *bat_priv, uint8_t *addr);
+
+#endif /* _NET_BATMAN_ADV_TRANSLATION_TABLE_H_ */

net/batman-adv/types.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+
+
+#ifndef _NET_BATMAN_ADV_TYPES_H_
+#define _NET_BATMAN_ADV_TYPES_H_
+
+#include "packet.h"
+#include "bitarray.h"
+
+#define BAT_HEADER_LEN (sizeof(struct ethhdr) + \
+	((sizeof(struct unicast_packet) > sizeof(struct bcast_packet) ? \
+	 sizeof(struct unicast_packet) : \
+	 sizeof(struct bcast_packet))))
+
+
+struct batman_if {
+	struct list_head list;
+	int16_t if_num;
+	char if_status;
+	struct net_device *net_dev;
+	atomic_t seqno;
+	atomic_t frag_seqno;
+	unsigned char *packet_buff;
+	int packet_len;
+	struct kobject *hardif_obj;
+	struct kref refcount;
+	struct packet_type batman_adv_ptype;
+	struct net_device *soft_iface;
+	struct rcu_head rcu;
+};
+
+/**
+ *	orig_node - structure for orig_list maintaining nodes of mesh
+ *	@primary_addr: hosts primary interface address
+ *	@last_valid: when last packet from this node was received
+ *	@bcast_seqno_reset: time when the broadcast seqno window was reset
+ *	@batman_seqno_reset: time when the batman seqno window was reset
+ *	@gw_flags: flags related to gateway class
+ *	@flags: for now only VIS_SERVER flag
+ *	@last_real_seqno: last and best known squence number
+ *	@last_ttl: ttl of last received packet
+ *	@last_bcast_seqno: last broadcast sequence number received by this host
+ *
+ *	@candidates: how many candidates are available
+ *	@selected: next bonding candidate
+ */
+struct orig_node {
+	uint8_t orig[ETH_ALEN];
+	uint8_t primary_addr[ETH_ALEN];
+	struct neigh_node *router;
+	unsigned long *bcast_own;
+	uint8_t *bcast_own_sum;
+	uint8_t tq_own;
+	int tq_asym_penalty;
+	unsigned long last_valid;
+	unsigned long bcast_seqno_reset;
+	unsigned long batman_seqno_reset;
+	uint8_t gw_flags;
+	uint8_t flags;
+	unsigned char *hna_buff;
+	int16_t hna_buff_len;
+	uint32_t last_real_seqno;
+	uint8_t last_ttl;
+	unsigned long bcast_bits[NUM_WORDS];
+	uint32_t last_bcast_seqno;
+	struct list_head neigh_list;
+	struct list_head frag_list;
+	unsigned long last_frag_packet;
+	struct {
+		uint8_t candidates;
+		struct neigh_node *selected;
+	} bond;
+};
+
+struct gw_node {
+	struct hlist_node list;
+	struct orig_node *orig_node;
+	unsigned long deleted;
+	struct kref refcount;
+	struct rcu_head rcu;
+};
+
+/**
+ *	neigh_node
+ *	@last_valid: when last packet via this neighbor was received
+ */
+struct neigh_node {
+	struct list_head list;
+	uint8_t addr[ETH_ALEN];
+	uint8_t real_packet_count;
+	uint8_t tq_recv[TQ_GLOBAL_WINDOW_SIZE];
+	uint8_t tq_index;
+	uint8_t tq_avg;
+	uint8_t last_ttl;
+	struct neigh_node *next_bond_candidate;
+	unsigned long last_valid;
+	unsigned long real_bits[NUM_WORDS];
+	struct orig_node *orig_node;
+	struct batman_if *if_incoming;
+};
+
+
+struct bat_priv {
+	atomic_t mesh_state;
+	struct net_device_stats stats;
+	atomic_t aggregated_ogms;	/* boolean */
+	atomic_t bonding;		/* boolean */
+	atomic_t fragmentation;		/* boolean */
+	atomic_t vis_mode;		/* VIS_TYPE_* */
+	atomic_t gw_mode;		/* GW_MODE_* */
+	atomic_t gw_sel_class;		/* uint */
+	atomic_t gw_bandwidth;		/* gw bandwidth */
+	atomic_t orig_interval;		/* uint */
+	atomic_t hop_penalty;		/* uint */
+	atomic_t log_level;		/* uint */
+	atomic_t bcast_seqno;
+	atomic_t bcast_queue_left;
+	atomic_t batman_queue_left;
+	char num_ifaces;
+	struct hlist_head softif_neigh_list;
+	struct softif_neigh *softif_neigh;
+	struct debug_log *debug_log;
+	struct batman_if *primary_if;
+	struct kobject *mesh_obj;
+	struct dentry *debug_dir;
+	struct hlist_head forw_bat_list;
+	struct hlist_head forw_bcast_list;
+	struct hlist_head gw_list;
+	struct list_head vis_send_list;
+	struct hashtable_t *orig_hash;
+	struct hashtable_t *hna_local_hash;
+	struct hashtable_t *hna_global_hash;
+	struct hashtable_t *vis_hash;
+	spinlock_t orig_hash_lock; /* protects orig_hash */
+	spinlock_t forw_bat_list_lock; /* protects forw_bat_list */
+	spinlock_t forw_bcast_list_lock; /* protects  */
+	spinlock_t hna_lhash_lock; /* protects hna_local_hash */
+	spinlock_t hna_ghash_lock; /* protects hna_global_hash */
+	spinlock_t gw_list_lock; /* protects gw_list */
+	spinlock_t vis_hash_lock; /* protects vis_hash */
+	spinlock_t vis_list_lock; /* protects vis_info::recv_list */
+	spinlock_t softif_neigh_lock; /* protects soft-interface neigh list */
+	int16_t num_local_hna;
+	atomic_t hna_local_changed;
+	struct delayed_work hna_work;
+	struct delayed_work orig_work;
+	struct delayed_work vis_work;
+	struct gw_node *curr_gw;
+	struct vis_info *my_vis_info;
+};
+
+struct socket_client {
+	struct list_head queue_list;
+	unsigned int queue_len;
+	unsigned char index;
+	spinlock_t lock; /* protects queue_list, queue_len, index */
+	wait_queue_head_t queue_wait;
+	struct bat_priv *bat_priv;
+};
+
+struct socket_packet {
+	struct list_head list;
+	size_t icmp_len;
+	struct icmp_packet_rr icmp_packet;
+};
+
+struct hna_local_entry {
+	uint8_t addr[ETH_ALEN];
+	unsigned long last_seen;
+	char never_purge;
+};
+
+struct hna_global_entry {
+	uint8_t addr[ETH_ALEN];
+	struct orig_node *orig_node;
+};
+
+/**
+ *	forw_packet - structure for forw_list maintaining packets to be
+ *	              send/forwarded
+ */
+struct forw_packet {
+	struct hlist_node list;
+	unsigned long send_time;
+	uint8_t own;
+	struct sk_buff *skb;
+	uint16_t packet_len;
+	uint32_t direct_link_flags;
+	uint8_t num_packets;
+	struct delayed_work delayed_work;
+	struct batman_if *if_incoming;
+};
+
+/* While scanning for vis-entries of a particular vis-originator
+ * this list collects its interfaces to create a subgraph/cluster
+ * out of them later
+ */
+struct if_list_entry {
+	uint8_t addr[ETH_ALEN];
+	bool primary;
+	struct hlist_node list;
+};
+
+struct debug_log {
+	char log_buff[LOG_BUF_LEN];
+	unsigned long log_start;
+	unsigned long log_end;
+	spinlock_t lock; /* protects log_buff, log_start and log_end */
+	wait_queue_head_t queue_wait;
+};
+
+struct frag_packet_list_entry {
+	struct list_head list;
+	uint16_t seqno;
+	struct sk_buff *skb;
+};
+
+struct vis_info {
+	unsigned long       first_seen;
+	struct list_head    recv_list;
+			    /* list of server-neighbors we received a vis-packet
+			     * from.  we should not reply to them. */
+	struct list_head send_list;
+	struct kref refcount;
+	struct bat_priv *bat_priv;
+	/* this packet might be part of the vis send queue. */
+	struct sk_buff *skb_packet;
+	/* vis_info may follow here*/
+} __attribute__((packed));
+
+struct vis_info_entry {
+	uint8_t  src[ETH_ALEN];
+	uint8_t  dest[ETH_ALEN];
+	uint8_t  quality;	/* quality = 0 means HNA */
+} __attribute__((packed));
+
+struct recvlist_node {
+	struct list_head list;
+	uint8_t mac[ETH_ALEN];
+};
+
+struct softif_neigh {
+	struct hlist_node list;
+	uint8_t addr[ETH_ALEN];
+	unsigned long last_seen;
+	short vid;
+	struct kref refcount;
+	struct rcu_head rcu;
+};
+
+#endif /* _NET_BATMAN_ADV_TYPES_H_ */

net/batman-adv/unicast.c

+/*
+ * Copyright (C) 2010 B.A.T.M.A.N. contributors:
+ *
+ * Andreas Langer
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "unicast.h"
+#include "send.h"
+#include "soft-interface.h"
+#include "gateway_client.h"
+#include "originator.h"
+#include "hash.h"
+#include "translation-table.h"
+#include "routing.h"
+#include "hard-interface.h"
+
+
+static struct sk_buff *frag_merge_packet(struct list_head *head,
+					 struct frag_packet_list_entry *tfp,
+					 struct sk_buff *skb)
+{
+	struct unicast_frag_packet *up =
+		(struct unicast_frag_packet *)skb->data;
+	struct sk_buff *tmp_skb;
+	struct unicast_packet *unicast_packet;
+	int hdr_len = sizeof(struct unicast_packet),
+	    uni_diff = sizeof(struct unicast_frag_packet) - hdr_len;
+
+	/* set skb to the first part and tmp_skb to the second part */
+	if (up->flags & UNI_FRAG_HEAD) {
+		tmp_skb = tfp->skb;
+	} else {
+		tmp_skb = skb;
+		skb = tfp->skb;
+	}
+
+	skb_pull(tmp_skb, sizeof(struct unicast_frag_packet));
+	if (pskb_expand_head(skb, 0, tmp_skb->len, GFP_ATOMIC) < 0) {
+		/* free buffered skb, skb will be freed later */
+		kfree_skb(tfp->skb);
+		return NULL;
+	}
+
+	/* move free entry to end */
+	tfp->skb = NULL;
+	tfp->seqno = 0;
+	list_move_tail(&tfp->list, head);
+
+	memcpy(skb_put(skb, tmp_skb->len), tmp_skb->data, tmp_skb->len);
+	kfree_skb(tmp_skb);
+
+	memmove(skb->data + uni_diff, skb->data, hdr_len);
+	unicast_packet = (struct unicast_packet *) skb_pull(skb, uni_diff);
+	unicast_packet->packet_type = BAT_UNICAST;
+
+	return skb;
+}
+
+static void frag_create_entry(struct list_head *head, struct sk_buff *skb)
+{
+	struct frag_packet_list_entry *tfp;
+	struct unicast_frag_packet *up =
+		(struct unicast_frag_packet *)skb->data;
+
+	/* free and oldest packets stand at the end */
+	tfp = list_entry((head)->prev, typeof(*tfp), list);
+	kfree_skb(tfp->skb);
+
+	tfp->seqno = ntohs(up->seqno);
+	tfp->skb = skb;
+	list_move(&tfp->list, head);
+	return;
+}
+
+static int frag_create_buffer(struct list_head *head)
+{
+	int i;
+	struct frag_packet_list_entry *tfp;
+
+	for (i = 0; i < FRAG_BUFFER_SIZE; i++) {
+		tfp = kmalloc(sizeof(struct frag_packet_list_entry),
+			GFP_ATOMIC);
+		if (!tfp) {
+			frag_list_free(head);
+			return -ENOMEM;
+		}
+		tfp->skb = NULL;
+		tfp->seqno = 0;
+		INIT_LIST_HEAD(&tfp->list);
+		list_add(&tfp->list, head);
+	}
+
+	return 0;
+}
+
+static struct frag_packet_list_entry *frag_search_packet(struct list_head *head,
+						 struct unicast_frag_packet *up)
+{
+	struct frag_packet_list_entry *tfp;
+	struct unicast_frag_packet *tmp_up = NULL;
+	uint16_t search_seqno;
+
+	if (up->flags & UNI_FRAG_HEAD)
+		search_seqno = ntohs(up->seqno)+1;
+	else
+		search_seqno = ntohs(up->seqno)-1;
+
+	list_for_each_entry(tfp, head, list) {
+
+		if (!tfp->skb)
+			continue;
+
+		if (tfp->seqno == ntohs(up->seqno))
+			goto mov_tail;
+
+		tmp_up = (struct unicast_frag_packet *)tfp->skb->data;
+
+		if (tfp->seqno == search_seqno) {
+
+			if ((tmp_up->flags & UNI_FRAG_HEAD) !=
+			    (up->flags & UNI_FRAG_HEAD))
+				return tfp;
+			else
+				goto mov_tail;
+		}
+	}
+	return NULL;
+
+mov_tail:
+	list_move_tail(&tfp->list, head);
+	return NULL;
+}
+
+void frag_list_free(struct list_head *head)
+{
+	struct frag_packet_list_entry *pf, *tmp_pf;
+
+	if (!list_empty(head)) {
+
+		list_for_each_entry_safe(pf, tmp_pf, head, list) {
+			kfree_skb(pf->skb);
+			list_del(&pf->list);
+			kfree(pf);
+		}
+	}
+	return;
+}
+
+/* frag_reassemble_skb():
+ * returns NET_RX_DROP if the operation failed - skb is left intact
+ * returns NET_RX_SUCCESS if the fragment was buffered (skb_new will be NULL)
+ * or the skb could be reassembled (skb_new will point to the new packet and
+ * skb was freed)
+ */
+int frag_reassemble_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
+			struct sk_buff **new_skb)
+{
+	struct orig_node *orig_node;
+	struct frag_packet_list_entry *tmp_frag_entry;
+	int ret = NET_RX_DROP;
+	struct unicast_frag_packet *unicast_packet =
+		(struct unicast_frag_packet *)skb->data;
+
+	*new_skb = NULL;
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	orig_node = ((struct orig_node *)
+		    hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
+			      unicast_packet->orig));
+
+	if (!orig_node) {
+		pr_debug("couldn't find originator in orig_hash\n");
+		goto out;
+	}
+
+	orig_node->last_frag_packet = jiffies;
+
+	if (list_empty(&orig_node->frag_list) &&
+	    frag_create_buffer(&orig_node->frag_list)) {
+		pr_debug("couldn't create frag buffer\n");
+		goto out;
+	}
+
+	tmp_frag_entry = frag_search_packet(&orig_node->frag_list,
+					    unicast_packet);
+
+	if (!tmp_frag_entry) {
+		frag_create_entry(&orig_node->frag_list, skb);
+		ret = NET_RX_SUCCESS;
+		goto out;
+	}
+
+	*new_skb = frag_merge_packet(&orig_node->frag_list, tmp_frag_entry,
+				     skb);
+	/* if not, merge failed */
+	if (*new_skb)
+		ret = NET_RX_SUCCESS;
+out:
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	return ret;
+}
+
+int frag_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
+		  struct batman_if *batman_if, uint8_t dstaddr[])
+{
+	struct unicast_packet tmp_uc, *unicast_packet;
+	struct sk_buff *frag_skb;
+	struct unicast_frag_packet *frag1, *frag2;
+	int uc_hdr_len = sizeof(struct unicast_packet);
+	int ucf_hdr_len = sizeof(struct unicast_frag_packet);
+	int data_len = skb->len;
+
+	if (!bat_priv->primary_if)
+		goto dropped;
+
+	unicast_packet = (struct unicast_packet *) skb->data;
+
+	memcpy(&tmp_uc, unicast_packet, uc_hdr_len);
+	frag_skb = dev_alloc_skb(data_len - (data_len / 2) + ucf_hdr_len);
+	skb_split(skb, frag_skb, data_len / 2);
+
+	if (my_skb_head_push(skb, ucf_hdr_len - uc_hdr_len) < 0 ||
+	    my_skb_head_push(frag_skb, ucf_hdr_len) < 0)
+		goto drop_frag;
+
+	frag1 = (struct unicast_frag_packet *)skb->data;
+	frag2 = (struct unicast_frag_packet *)frag_skb->data;
+
+	memcpy(frag1, &tmp_uc, sizeof(struct unicast_packet));
+
+	frag1->ttl--;
+	frag1->version = COMPAT_VERSION;
+	frag1->packet_type = BAT_UNICAST_FRAG;
+
+	memcpy(frag1->orig, bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+	memcpy(frag2, frag1, sizeof(struct unicast_frag_packet));
+
+	frag1->flags |= UNI_FRAG_HEAD;
+	frag2->flags &= ~UNI_FRAG_HEAD;
+
+	frag1->seqno = htons((uint16_t)atomic_inc_return(
+			     &batman_if->frag_seqno));
+	frag2->seqno = htons((uint16_t)atomic_inc_return(
+			     &batman_if->frag_seqno));
+
+	send_skb_packet(skb, batman_if, dstaddr);
+	send_skb_packet(frag_skb, batman_if, dstaddr);
+	return NET_RX_SUCCESS;
+
+drop_frag:
+	kfree_skb(frag_skb);
+dropped:
+	kfree_skb(skb);
+	return NET_RX_DROP;
+}
+
+int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv)
+{
+	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
+	struct unicast_packet *unicast_packet;
+	struct orig_node *orig_node;
+	struct batman_if *batman_if;
+	struct neigh_node *router;
+	int data_len = skb->len;
+	uint8_t dstaddr[6];
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+
+	/* get routing information */
+	if (is_multicast_ether_addr(ethhdr->h_dest))
+		orig_node = (struct orig_node *)gw_get_selected(bat_priv);
+	else
+		orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
+							   compare_orig,
+							   choose_orig,
+							   ethhdr->h_dest));
+
+	/* check for hna host */
+	if (!orig_node)
+		orig_node = transtable_search(bat_priv, ethhdr->h_dest);
+
+	router = find_router(bat_priv, orig_node, NULL);
+
+	if (!router)
+		goto unlock;
+
+	/* don't lock while sending the packets ... we therefore
+		* copy the required data before sending */
+
+	batman_if = router->if_incoming;
+	memcpy(dstaddr, router->addr, ETH_ALEN);
+
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	if (batman_if->if_status != IF_ACTIVE)
+		goto dropped;
+
+	if (my_skb_head_push(skb, sizeof(struct unicast_packet)) < 0)
+		goto dropped;
+
+	unicast_packet = (struct unicast_packet *)skb->data;
+
+	unicast_packet->version = COMPAT_VERSION;
+	/* batman packet type: unicast */
+	unicast_packet->packet_type = BAT_UNICAST;
+	/* set unicast ttl */
+	unicast_packet->ttl = TTL;
+	/* copy the destination for faster routing */
+	memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
+
+	if (atomic_read(&bat_priv->fragmentation) &&
+	    data_len + sizeof(struct unicast_packet) >
+	    batman_if->net_dev->mtu) {
+		/* send frag skb decreases ttl */
+		unicast_packet->ttl++;
+		return frag_send_skb(skb, bat_priv, batman_if,
+				     dstaddr);
+	}
+	send_skb_packet(skb, batman_if, dstaddr);
+	return 0;
+
+unlock:
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+dropped:
+	kfree_skb(skb);
+	return 1;
+}

net/batman-adv/unicast.h

+/*
+ * Copyright (C) 2010 B.A.T.M.A.N. contributors:
+ *
+ * Andreas Langer
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_UNICAST_H_
+#define _NET_BATMAN_ADV_UNICAST_H_
+
+#define FRAG_TIMEOUT 10000	/* purge frag list entrys after time in ms */
+#define FRAG_BUFFER_SIZE 6	/* number of list elements in buffer */
+
+int frag_reassemble_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
+			struct sk_buff **new_skb);
+void frag_list_free(struct list_head *head);
+int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv);
+int frag_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
+		  struct batman_if *batman_if, uint8_t dstaddr[]);
+
+#endif /* _NET_BATMAN_ADV_UNICAST_H_ */

net/batman-adv/vis.c

+/*
+ * Copyright (C) 2008-2010 B.A.T.M.A.N. contributors:
+ *
+ * Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "send.h"
+#include "translation-table.h"
+#include "vis.h"
+#include "soft-interface.h"
+#include "hard-interface.h"
+#include "hash.h"
+#include "originator.h"
+
+#define MAX_VIS_PACKET_SIZE 1000
+
+/* Returns the smallest signed integer in two's complement with the sizeof x */
+#define smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))
+
+/* Checks if a sequence number x is a predecessor/successor of y.
+ * they handle overflows/underflows and can correctly check for a
+ * predecessor/successor unless the variable sequence number has grown by
+ * more then 2**(bitwidth(x)-1)-1.
+ * This means that for a uint8_t with the maximum value 255, it would think:
+ *  - when adding nothing - it is neither a predecessor nor a successor
+ *  - before adding more than 127 to the starting value - it is a predecessor,
+ *  - when adding 128 - it is neither a predecessor nor a successor,
+ *  - after adding more than 127 to the starting value - it is a successor */
+#define seq_before(x, y) ({typeof(x) _dummy = (x - y); \
+			_dummy > smallest_signed_int(_dummy); })
+#define seq_after(x, y) seq_before(y, x)
+
+static void start_vis_timer(struct bat_priv *bat_priv);
+
+/* free the info */
+static void free_info(struct kref *ref)
+{
+	struct vis_info *info = container_of(ref, struct vis_info, refcount);
+	struct bat_priv *bat_priv = info->bat_priv;
+	struct recvlist_node *entry, *tmp;
+
+	list_del_init(&info->send_list);
+	spin_lock_bh(&bat_priv->vis_list_lock);
+	list_for_each_entry_safe(entry, tmp, &info->recv_list, list) {
+		list_del(&entry->list);
+		kfree(entry);
+	}
+
+	spin_unlock_bh(&bat_priv->vis_list_lock);
+	kfree_skb(info->skb_packet);
+}
+
+/* Compare two vis packets, used by the hashing algorithm */
+static int vis_info_cmp(void *data1, void *data2)
+{
+	struct vis_info *d1, *d2;
+	struct vis_packet *p1, *p2;
+	d1 = data1;
+	d2 = data2;
+	p1 = (struct vis_packet *)d1->skb_packet->data;
+	p2 = (struct vis_packet *)d2->skb_packet->data;
+	return compare_orig(p1->vis_orig, p2->vis_orig);
+}
+
+/* hash function to choose an entry in a hash table of given size */
+/* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */
+static int vis_info_choose(void *data, int size)
+{
+	struct vis_info *vis_info = data;
+	struct vis_packet *packet;
+	unsigned char *key;
+	uint32_t hash = 0;
+	size_t i;
+
+	packet = (struct vis_packet *)vis_info->skb_packet->data;
+	key = packet->vis_orig;
+	for (i = 0; i < ETH_ALEN; i++) {
+		hash += key[i];
+		hash += (hash << 10);
+		hash ^= (hash >> 6);
+	}
+
+	hash += (hash << 3);
+	hash ^= (hash >> 11);
+	hash += (hash << 15);
+
+	return hash % size;
+}
+
+/* insert interface to the list of interfaces of one originator, if it
+ * does not already exist in the list */
+static void vis_data_insert_interface(const uint8_t *interface,
+				      struct hlist_head *if_list,
+				      bool primary)
+{
+	struct if_list_entry *entry;
+	struct hlist_node *pos;
+
+	hlist_for_each_entry(entry, pos, if_list, list) {
+		if (compare_orig(entry->addr, (void *)interface))
+			return;
+	}
+
+	/* its a new address, add it to the list */
+	entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
+	if (!entry)
+		return;
+	memcpy(entry->addr, interface, ETH_ALEN);
+	entry->primary = primary;
+	hlist_add_head(&entry->list, if_list);
+}
+
+static ssize_t vis_data_read_prim_sec(char *buff, struct hlist_head *if_list)
+{
+	struct if_list_entry *entry;
+	struct hlist_node *pos;
+	size_t len = 0;
+
+	hlist_for_each_entry(entry, pos, if_list, list) {
+		if (entry->primary)
+			len += sprintf(buff + len, "PRIMARY, ");
+		else
+			len += sprintf(buff + len,  "SEC %pM, ", entry->addr);
+	}
+
+	return len;
+}
+
+static size_t vis_data_count_prim_sec(struct hlist_head *if_list)
+{
+	struct if_list_entry *entry;
+	struct hlist_node *pos;
+	size_t count = 0;
+
+	hlist_for_each_entry(entry, pos, if_list, list) {
+		if (entry->primary)
+			count += 9;
+		else
+			count += 23;
+	}
+
+	return count;
+}
+
+/* read an entry  */
+static ssize_t vis_data_read_entry(char *buff, struct vis_info_entry *entry,
+				   uint8_t *src, bool primary)
+{
+	/* maximal length: max(4+17+2, 3+17+1+3+2) == 26 */
+	if (primary && entry->quality == 0)
+		return sprintf(buff, "HNA %pM, ", entry->dest);
+	else if (compare_orig(entry->src, src))
+		return sprintf(buff, "TQ %pM %d, ", entry->dest,
+			       entry->quality);
+
+	return 0;
+}
+
+int vis_seq_print_text(struct seq_file *seq, void *offset)
+{
+	struct hlist_node *walk;
+	struct hlist_head *head;
+	struct element_t *bucket;
+	struct vis_info *info;
+	struct vis_packet *packet;
+	struct vis_info_entry *entries;
+	struct net_device *net_dev = (struct net_device *)seq->private;
+	struct bat_priv *bat_priv = netdev_priv(net_dev);
+	struct hashtable_t *hash = bat_priv->vis_hash;
+	HLIST_HEAD(vis_if_list);
+	struct if_list_entry *entry;
+	struct hlist_node *pos, *n;
+	int i, j;
+	int vis_server = atomic_read(&bat_priv->vis_mode);
+	size_t buff_pos, buf_size;
+	char *buff;
+	int compare;
+
+	if ((!bat_priv->primary_if) ||
+	    (vis_server == VIS_TYPE_CLIENT_UPDATE))
+		return 0;
+
+	buf_size = 1;
+	/* Estimate length */
+	spin_lock_bh(&bat_priv->vis_hash_lock);
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry(bucket, walk, head, hlist) {
+			info = bucket->data;
+			packet = (struct vis_packet *)info->skb_packet->data;
+			entries = (struct vis_info_entry *)
+				((char *)packet + sizeof(struct vis_packet));
+
+			for (j = 0; j < packet->entries; j++) {
+				if (entries[j].quality == 0)
+					continue;
+				compare =
+				 compare_orig(entries[j].src, packet->vis_orig);
+				vis_data_insert_interface(entries[j].src,
+							  &vis_if_list,
+							  compare);
+			}
+
+			hlist_for_each_entry(entry, pos, &vis_if_list, list) {
+				buf_size += 18 + 26 * packet->entries;
+
+				/* add primary/secondary records */
+				if (compare_orig(entry->addr, packet->vis_orig))
+					buf_size +=
+					  vis_data_count_prim_sec(&vis_if_list);
+
+				buf_size += 1;
+			}
+
+			hlist_for_each_entry_safe(entry, pos, n, &vis_if_list,
+						  list) {
+				hlist_del(&entry->list);
+				kfree(entry);
+			}
+		}
+	}
+
+	buff = kmalloc(buf_size, GFP_ATOMIC);
+	if (!buff) {
+		spin_unlock_bh(&bat_priv->vis_hash_lock);
+		return -ENOMEM;
+	}
+	buff[0] = '\0';
+	buff_pos = 0;
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry(bucket, walk, head, hlist) {
+			info = bucket->data;
+			packet = (struct vis_packet *)info->skb_packet->data;
+			entries = (struct vis_info_entry *)
+				((char *)packet + sizeof(struct vis_packet));
+
+			for (j = 0; j < packet->entries; j++) {
+				if (entries[j].quality == 0)
+					continue;
+				compare =
+				 compare_orig(entries[j].src, packet->vis_orig);
+				vis_data_insert_interface(entries[j].src,
+							  &vis_if_list,
+							  compare);
+			}
+
+			hlist_for_each_entry(entry, pos, &vis_if_list, list) {
+				buff_pos += sprintf(buff + buff_pos, "%pM,",
+						entry->addr);
+
+				for (i = 0; i < packet->entries; i++)
+					buff_pos += vis_data_read_entry(
+							buff + buff_pos,
+							&entries[i],
+							entry->addr,
+							entry->primary);
+
+				/* add primary/secondary records */
+				if (compare_orig(entry->addr, packet->vis_orig))
+					buff_pos +=
+					 vis_data_read_prim_sec(buff + buff_pos,
+								&vis_if_list);
+
+				buff_pos += sprintf(buff + buff_pos, "\n");
+			}
+
+			hlist_for_each_entry_safe(entry, pos, n, &vis_if_list,
+						  list) {
+				hlist_del(&entry->list);
+				kfree(entry);
+			}
+		}
+	}
+
+	spin_unlock_bh(&bat_priv->vis_hash_lock);
+
+	seq_printf(seq, "%s", buff);
+	kfree(buff);
+
+	return 0;
+}
+
+/* add the info packet to the send list, if it was not
+ * already linked in. */
+static void send_list_add(struct bat_priv *bat_priv, struct vis_info *info)
+{
+	if (list_empty(&info->send_list)) {
+		kref_get(&info->refcount);
+		list_add_tail(&info->send_list, &bat_priv->vis_send_list);
+	}
+}
+
+/* delete the info packet from the send list, if it was
+ * linked in. */
+static void send_list_del(struct vis_info *info)
+{
+	if (!list_empty(&info->send_list)) {
+		list_del_init(&info->send_list);
+		kref_put(&info->refcount, free_info);
+	}
+}
+
+/* tries to add one entry to the receive list. */
+static void recv_list_add(struct bat_priv *bat_priv,
+			  struct list_head *recv_list, char *mac)
+{
+	struct recvlist_node *entry;
+
+	entry = kmalloc(sizeof(struct recvlist_node), GFP_ATOMIC);
+	if (!entry)
+		return;
+
+	memcpy(entry->mac, mac, ETH_ALEN);
+	spin_lock_bh(&bat_priv->vis_list_lock);
+	list_add_tail(&entry->list, recv_list);
+	spin_unlock_bh(&bat_priv->vis_list_lock);
+}
+
+/* returns 1 if this mac is in the recv_list */
+static int recv_list_is_in(struct bat_priv *bat_priv,
+			   struct list_head *recv_list, char *mac)
+{
+	struct recvlist_node *entry;
+
+	spin_lock_bh(&bat_priv->vis_list_lock);
+	list_for_each_entry(entry, recv_list, list) {
+		if (memcmp(entry->mac, mac, ETH_ALEN) == 0) {
+			spin_unlock_bh(&bat_priv->vis_list_lock);
+			return 1;
+		}
+	}
+	spin_unlock_bh(&bat_priv->vis_list_lock);
+	return 0;
+}
+
+/* try to add the packet to the vis_hash. return NULL if invalid (e.g. too old,
+ * broken.. ).	vis hash must be locked outside.  is_new is set when the packet
+ * is newer than old entries in the hash. */
+static struct vis_info *add_packet(struct bat_priv *bat_priv,
+				   struct vis_packet *vis_packet,
+				   int vis_info_len, int *is_new,
+				   int make_broadcast)
+{
+	struct vis_info *info, *old_info;
+	struct vis_packet *search_packet, *old_packet;
+	struct vis_info search_elem;
+	struct vis_packet *packet;
+	int hash_added;
+
+	*is_new = 0;
+	/* sanity check */
+	if (!bat_priv->vis_hash)
+		return NULL;
+
+	/* see if the packet is already in vis_hash */
+	search_elem.skb_packet = dev_alloc_skb(sizeof(struct vis_packet));
+	if (!search_elem.skb_packet)
+		return NULL;
+	search_packet = (struct vis_packet *)skb_put(search_elem.skb_packet,
+						     sizeof(struct vis_packet));
+
+	memcpy(search_packet->vis_orig, vis_packet->vis_orig, ETH_ALEN);
+	old_info = hash_find(bat_priv->vis_hash, vis_info_cmp, vis_info_choose,
+			     &search_elem);
+	kfree_skb(search_elem.skb_packet);
+
+	if (old_info) {
+		old_packet = (struct vis_packet *)old_info->skb_packet->data;
+		if (!seq_after(ntohl(vis_packet->seqno),
+			       ntohl(old_packet->seqno))) {
+			if (old_packet->seqno == vis_packet->seqno) {
+				recv_list_add(bat_priv, &old_info->recv_list,
+					      vis_packet->sender_orig);
+				return old_info;
+			} else {
+				/* newer packet is already in hash. */
+				return NULL;
+			}
+		}
+		/* remove old entry */
+		hash_remove(bat_priv->vis_hash, vis_info_cmp, vis_info_choose,
+			    old_info);
+		send_list_del(old_info);
+		kref_put(&old_info->refcount, free_info);
+	}
+
+	info = kmalloc(sizeof(struct vis_info), GFP_ATOMIC);
+	if (!info)
+		return NULL;
+
+	info->skb_packet = dev_alloc_skb(sizeof(struct vis_packet) +
+					 vis_info_len + sizeof(struct ethhdr));
+	if (!info->skb_packet) {
+		kfree(info);
+		return NULL;
+	}
+	skb_reserve(info->skb_packet, sizeof(struct ethhdr));
+	packet = (struct vis_packet *)skb_put(info->skb_packet,
+					      sizeof(struct vis_packet) +
+					      vis_info_len);
+
+	kref_init(&info->refcount);
+	INIT_LIST_HEAD(&info->send_list);
+	INIT_LIST_HEAD(&info->recv_list);
+	info->first_seen = jiffies;
+	info->bat_priv = bat_priv;
+	memcpy(packet, vis_packet, sizeof(struct vis_packet) + vis_info_len);
+
+	/* initialize and add new packet. */
+	*is_new = 1;
+
+	/* Make it a broadcast packet, if required */
+	if (make_broadcast)
+		memcpy(packet->target_orig, broadcast_addr, ETH_ALEN);
+
+	/* repair if entries is longer than packet. */
+	if (packet->entries * sizeof(struct vis_info_entry) > vis_info_len)
+		packet->entries = vis_info_len / sizeof(struct vis_info_entry);
+
+	recv_list_add(bat_priv, &info->recv_list, packet->sender_orig);
+
+	/* try to add it */
+	hash_added = hash_add(bat_priv->vis_hash, vis_info_cmp, vis_info_choose,
+			      info);
+	if (hash_added < 0) {
+		/* did not work (for some reason) */
+		kref_put(&old_info->refcount, free_info);
+		info = NULL;
+	}
+
+	return info;
+}
+
+/* handle the server sync packet, forward if needed. */
+void receive_server_sync_packet(struct bat_priv *bat_priv,
+				struct vis_packet *vis_packet,
+				int vis_info_len)
+{
+	struct vis_info *info;
+	int is_new, make_broadcast;
+	int vis_server = atomic_read(&bat_priv->vis_mode);
+
+	make_broadcast = (vis_server == VIS_TYPE_SERVER_SYNC);
+
+	spin_lock_bh(&bat_priv->vis_hash_lock);
+	info = add_packet(bat_priv, vis_packet, vis_info_len,
+			  &is_new, make_broadcast);
+	if (!info)
+		goto end;
+
+	/* only if we are server ourselves and packet is newer than the one in
+	 * hash.*/
+	if (vis_server == VIS_TYPE_SERVER_SYNC && is_new)
+		send_list_add(bat_priv, info);
+end:
+	spin_unlock_bh(&bat_priv->vis_hash_lock);
+}
+
+/* handle an incoming client update packet and schedule forward if needed. */
+void receive_client_update_packet(struct bat_priv *bat_priv,
+				  struct vis_packet *vis_packet,
+				  int vis_info_len)
+{
+	struct vis_info *info;
+	struct vis_packet *packet;
+	int is_new;
+	int vis_server = atomic_read(&bat_priv->vis_mode);
+	int are_target = 0;
+
+	/* clients shall not broadcast. */
+	if (is_broadcast_ether_addr(vis_packet->target_orig))
+		return;
+
+	/* Are we the target for this VIS packet? */
+	if (vis_server == VIS_TYPE_SERVER_SYNC	&&
+	    is_my_mac(vis_packet->target_orig))
+		are_target = 1;
+
+	spin_lock_bh(&bat_priv->vis_hash_lock);
+	info = add_packet(bat_priv, vis_packet, vis_info_len,
+			  &is_new, are_target);
+
+	if (!info)
+		goto end;
+	/* note that outdated packets will be dropped at this point. */
+
+	packet = (struct vis_packet *)info->skb_packet->data;
+
+	/* send only if we're the target server or ... */
+	if (are_target && is_new) {
+		packet->vis_type = VIS_TYPE_SERVER_SYNC;	/* upgrade! */
+		send_list_add(bat_priv, info);
+
+		/* ... we're not the recipient (and thus need to forward). */
+	} else if (!is_my_mac(packet->target_orig)) {
+		send_list_add(bat_priv, info);
+	}
+
+end:
+	spin_unlock_bh(&bat_priv->vis_hash_lock);
+}
+
+/* Walk the originators and find the VIS server with the best tq. Set the packet
+ * address to its address and return the best_tq.
+ *
+ * Must be called with the originator hash locked */
+static int find_best_vis_server(struct bat_priv *bat_priv,
+				struct vis_info *info)
+{
+	struct hashtable_t *hash = bat_priv->orig_hash;
+	struct hlist_node *walk;
+	struct hlist_head *head;
+	struct element_t *bucket;
+	struct orig_node *orig_node;
+	struct vis_packet *packet;
+	int best_tq = -1, i;
+
+	packet = (struct vis_packet *)info->skb_packet->data;
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry(bucket, walk, head, hlist) {
+			orig_node = bucket->data;
+			if ((orig_node) && (orig_node->router) &&
+			(orig_node->flags & VIS_SERVER) &&
+			(orig_node->router->tq_avg > best_tq)) {
+				best_tq = orig_node->router->tq_avg;
+				memcpy(packet->target_orig, orig_node->orig,
+				       ETH_ALEN);
+			}
+		}
+	}
+
+	return best_tq;
+}
+
+/* Return true if the vis packet is full. */
+static bool vis_packet_full(struct vis_info *info)
+{
+	struct vis_packet *packet;
+	packet = (struct vis_packet *)info->skb_packet->data;
+
+	if (MAX_VIS_PACKET_SIZE / sizeof(struct vis_info_entry)
+		< packet->entries + 1)
+		return true;
+	return false;
+}
+
+/* generates a packet of own vis data,
+ * returns 0 on success, -1 if no packet could be generated */
+static int generate_vis_packet(struct bat_priv *bat_priv)
+{
+	struct hashtable_t *hash = bat_priv->orig_hash;
+	struct hlist_node *walk;
+	struct hlist_head *head;
+	struct element_t *bucket;
+	struct orig_node *orig_node;
+	struct neigh_node *neigh_node;
+	struct vis_info *info = (struct vis_info *)bat_priv->my_vis_info;
+	struct vis_packet *packet = (struct vis_packet *)info->skb_packet->data;
+	struct vis_info_entry *entry;
+	struct hna_local_entry *hna_local_entry;
+	int best_tq = -1, i;
+
+	info->first_seen = jiffies;
+	packet->vis_type = atomic_read(&bat_priv->vis_mode);
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	memcpy(packet->target_orig, broadcast_addr, ETH_ALEN);
+	packet->ttl = TTL;
+	packet->seqno = htonl(ntohl(packet->seqno) + 1);
+	packet->entries = 0;
+	skb_trim(info->skb_packet, sizeof(struct vis_packet));
+
+	if (packet->vis_type == VIS_TYPE_CLIENT_UPDATE) {
+		best_tq = find_best_vis_server(bat_priv, info);
+
+		if (best_tq < 0) {
+			spin_unlock_bh(&bat_priv->orig_hash_lock);
+			return -1;
+		}
+	}
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry(bucket, walk, head, hlist) {
+			orig_node = bucket->data;
+			neigh_node = orig_node->router;
+
+			if (!neigh_node)
+				continue;
+
+			if (!compare_orig(neigh_node->addr, orig_node->orig))
+				continue;
+
+			if (neigh_node->if_incoming->if_status != IF_ACTIVE)
+				continue;
+
+			if (neigh_node->tq_avg < 1)
+				continue;
+
+			/* fill one entry into buffer. */
+			entry = (struct vis_info_entry *)
+				      skb_put(info->skb_packet, sizeof(*entry));
+			memcpy(entry->src,
+			       neigh_node->if_incoming->net_dev->dev_addr,
+			       ETH_ALEN);
+			memcpy(entry->dest, orig_node->orig, ETH_ALEN);
+			entry->quality = neigh_node->tq_avg;
+			packet->entries++;
+
+			if (vis_packet_full(info)) {
+				spin_unlock_bh(&bat_priv->orig_hash_lock);
+				return 0;
+			}
+		}
+	}
+
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	hash = bat_priv->hna_local_hash;
+
+	spin_lock_bh(&bat_priv->hna_lhash_lock);
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry(bucket, walk, head, hlist) {
+			hna_local_entry = bucket->data;
+			entry = (struct vis_info_entry *)
+					skb_put(info->skb_packet,
+						sizeof(*entry));
+			memset(entry->src, 0, ETH_ALEN);
+			memcpy(entry->dest, hna_local_entry->addr, ETH_ALEN);
+			entry->quality = 0; /* 0 means HNA */
+			packet->entries++;
+
+			if (vis_packet_full(info)) {
+				spin_unlock_bh(&bat_priv->hna_lhash_lock);
+				return 0;
+			}
+		}
+	}
+
+	spin_unlock_bh(&bat_priv->hna_lhash_lock);
+	return 0;
+}
+
+/* free old vis packets. Must be called with this vis_hash_lock
+ * held */
+static void purge_vis_packets(struct bat_priv *bat_priv)
+{
+	int i;
+	struct hashtable_t *hash = bat_priv->vis_hash;
+	struct hlist_node *walk, *safe;
+	struct hlist_head *head;
+	struct element_t *bucket;
+	struct vis_info *info;
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry_safe(bucket, walk, safe, head, hlist) {
+			info = bucket->data;
+
+			/* never purge own data. */
+			if (info == bat_priv->my_vis_info)
+				continue;
+
+			if (time_after(jiffies,
+				       info->first_seen + VIS_TIMEOUT * HZ)) {
+				hlist_del(walk);
+				kfree(bucket);
+				send_list_del(info);
+				kref_put(&info->refcount, free_info);
+			}
+		}
+	}
+}
+
+static void broadcast_vis_packet(struct bat_priv *bat_priv,
+				 struct vis_info *info)
+{
+	struct hashtable_t *hash = bat_priv->orig_hash;
+	struct hlist_node *walk;
+	struct hlist_head *head;
+	struct element_t *bucket;
+	struct orig_node *orig_node;
+	struct vis_packet *packet;
+	struct sk_buff *skb;
+	struct batman_if *batman_if;
+	uint8_t dstaddr[ETH_ALEN];
+	int i;
+
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	packet = (struct vis_packet *)info->skb_packet->data;
+
+	/* send to all routers in range. */
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry(bucket, walk, head, hlist) {
+			orig_node = bucket->data;
+
+			/* if it's a vis server and reachable, send it. */
+			if ((!orig_node) || (!orig_node->router))
+				continue;
+			if (!(orig_node->flags & VIS_SERVER))
+				continue;
+			/* don't send it if we already received the packet from
+			* this node. */
+			if (recv_list_is_in(bat_priv, &info->recv_list,
+					    orig_node->orig))
+				continue;
+
+			memcpy(packet->target_orig, orig_node->orig, ETH_ALEN);
+			batman_if = orig_node->router->if_incoming;
+			memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
+			spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+			skb = skb_clone(info->skb_packet, GFP_ATOMIC);
+			if (skb)
+				send_skb_packet(skb, batman_if, dstaddr);
+
+			spin_lock_bh(&bat_priv->orig_hash_lock);
+		}
+
+	}
+
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+}
+
+static void unicast_vis_packet(struct bat_priv *bat_priv,
+			       struct vis_info *info)
+{
+	struct orig_node *orig_node;
+	struct sk_buff *skb;
+	struct vis_packet *packet;
+	struct batman_if *batman_if;
+	uint8_t dstaddr[ETH_ALEN];
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	packet = (struct vis_packet *)info->skb_packet->data;
+	orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
+						   compare_orig, choose_orig,
+						   packet->target_orig));
+
+	if ((!orig_node) || (!orig_node->router))
+		goto out;
+
+	/* don't lock while sending the packets ... we therefore
+	 * copy the required data before sending */
+	batman_if = orig_node->router->if_incoming;
+	memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	skb = skb_clone(info->skb_packet, GFP_ATOMIC);
+	if (skb)
+		send_skb_packet(skb, batman_if, dstaddr);
+
+	return;
+
+out:
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+}
+
+/* only send one vis packet. called from send_vis_packets() */
+static void send_vis_packet(struct bat_priv *bat_priv, struct vis_info *info)
+{
+	struct vis_packet *packet;
+
+	packet = (struct vis_packet *)info->skb_packet->data;
+	if (packet->ttl < 2) {
+		pr_debug("Error - can't send vis packet: ttl exceeded\n");
+		return;
+	}
+
+	memcpy(packet->sender_orig, bat_priv->primary_if->net_dev->dev_addr,
+	       ETH_ALEN);
+	packet->ttl--;
+
+	if (is_broadcast_ether_addr(packet->target_orig))
+		broadcast_vis_packet(bat_priv, info);
+	else
+		unicast_vis_packet(bat_priv, info);
+	packet->ttl++; /* restore TTL */
+}
+
+/* called from timer; send (and maybe generate) vis packet. */
+static void send_vis_packets(struct work_struct *work)
+{
+	struct delayed_work *delayed_work =
+		container_of(work, struct delayed_work, work);
+	struct bat_priv *bat_priv =
+		container_of(delayed_work, struct bat_priv, vis_work);
+	struct vis_info *info, *temp;
+
+	spin_lock_bh(&bat_priv->vis_hash_lock);
+	purge_vis_packets(bat_priv);
+
+	if (generate_vis_packet(bat_priv) == 0) {
+		/* schedule if generation was successful */
+		send_list_add(bat_priv, bat_priv->my_vis_info);
+	}
+
+	list_for_each_entry_safe(info, temp, &bat_priv->vis_send_list,
+				 send_list) {
+
+		kref_get(&info->refcount);
+		spin_unlock_bh(&bat_priv->vis_hash_lock);
+
+		if (bat_priv->primary_if)
+			send_vis_packet(bat_priv, info);
+
+		spin_lock_bh(&bat_priv->vis_hash_lock);
+		send_list_del(info);
+		kref_put(&info->refcount, free_info);
+	}
+	spin_unlock_bh(&bat_priv->vis_hash_lock);
+	start_vis_timer(bat_priv);
+}
+
+/* init the vis server. this may only be called when if_list is already
+ * initialized (e.g. bat0 is initialized, interfaces have been added) */
+int vis_init(struct bat_priv *bat_priv)
+{
+	struct vis_packet *packet;
+	int hash_added;
+
+	if (bat_priv->vis_hash)
+		return 1;
+
+	spin_lock_bh(&bat_priv->vis_hash_lock);
+
+	bat_priv->vis_hash = hash_new(256);
+	if (!bat_priv->vis_hash) {
+		pr_err("Can't initialize vis_hash\n");
+		goto err;
+	}
+
+	bat_priv->my_vis_info = kmalloc(MAX_VIS_PACKET_SIZE, GFP_ATOMIC);
+	if (!bat_priv->my_vis_info) {
+		pr_err("Can't initialize vis packet\n");
+		goto err;
+	}
+
+	bat_priv->my_vis_info->skb_packet = dev_alloc_skb(
+						sizeof(struct vis_packet) +
+						MAX_VIS_PACKET_SIZE +
+						sizeof(struct ethhdr));
+	if (!bat_priv->my_vis_info->skb_packet)
+		goto free_info;
+
+	skb_reserve(bat_priv->my_vis_info->skb_packet, sizeof(struct ethhdr));
+	packet = (struct vis_packet *)skb_put(
+					bat_priv->my_vis_info->skb_packet,
+					sizeof(struct vis_packet));
+
+	/* prefill the vis info */
+	bat_priv->my_vis_info->first_seen = jiffies -
+						msecs_to_jiffies(VIS_INTERVAL);
+	INIT_LIST_HEAD(&bat_priv->my_vis_info->recv_list);
+	INIT_LIST_HEAD(&bat_priv->my_vis_info->send_list);
+	kref_init(&bat_priv->my_vis_info->refcount);
+	bat_priv->my_vis_info->bat_priv = bat_priv;
+	packet->version = COMPAT_VERSION;
+	packet->packet_type = BAT_VIS;
+	packet->ttl = TTL;
+	packet->seqno = 0;
+	packet->entries = 0;
+
+	INIT_LIST_HEAD(&bat_priv->vis_send_list);
+
+	hash_added = hash_add(bat_priv->vis_hash, vis_info_cmp, vis_info_choose,
+			      bat_priv->my_vis_info);
+	if (hash_added < 0) {
+		pr_err("Can't add own vis packet into hash\n");
+		/* not in hash, need to remove it manually. */
+		kref_put(&bat_priv->my_vis_info->refcount, free_info);
+		goto err;
+	}
+
+	spin_unlock_bh(&bat_priv->vis_hash_lock);
+	start_vis_timer(bat_priv);
+	return 1;
+
+free_info:
+	kfree(bat_priv->my_vis_info);
+	bat_priv->my_vis_info = NULL;
+err:
+	spin_unlock_bh(&bat_priv->vis_hash_lock);
+	vis_quit(bat_priv);
+	return 0;
+}
+
+/* Decrease the reference count on a hash item info */
+static void free_info_ref(void *data, void *arg)
+{
+	struct vis_info *info = data;
+
+	send_list_del(info);
+	kref_put(&info->refcount, free_info);
+}
+
+/* shutdown vis-server */
+void vis_quit(struct bat_priv *bat_priv)
+{
+	if (!bat_priv->vis_hash)
+		return;
+
+	cancel_delayed_work_sync(&bat_priv->vis_work);
+
+	spin_lock_bh(&bat_priv->vis_hash_lock);
+	/* properly remove, kill timers ... */
+	hash_delete(bat_priv->vis_hash, free_info_ref, NULL);
+	bat_priv->vis_hash = NULL;
+	bat_priv->my_vis_info = NULL;
+	spin_unlock_bh(&bat_priv->vis_hash_lock);
+}
+
+/* schedule packets for (re)transmission */
+static void start_vis_timer(struct bat_priv *bat_priv)
+{
+	INIT_DELAYED_WORK(&bat_priv->vis_work, send_vis_packets);
+	queue_delayed_work(bat_event_workqueue, &bat_priv->vis_work,
+			   msecs_to_jiffies(VIS_INTERVAL));
+}

net/batman-adv/vis.h

+/*
+ * Copyright (C) 2008-2010 B.A.T.M.A.N. contributors:
+ *
+ * Simon Wunderlich, Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_VIS_H_
+#define _NET_BATMAN_ADV_VIS_H_
+
+#define VIS_TIMEOUT		200	/* timeout of vis packets in seconds */
+
+int vis_seq_print_text(struct seq_file *seq, void *offset);
+void receive_server_sync_packet(struct bat_priv *bat_priv,
+				struct vis_packet *vis_packet,
+				int vis_info_len);
+void receive_client_update_packet(struct bat_priv *bat_priv,
+				  struct vis_packet *vis_packet,
+				  int vis_info_len);
+int vis_init(struct bat_priv *bat_priv);
+void vis_quit(struct bat_priv *bat_priv);
+
+#endif /* _NET_BATMAN_ADV_VIS_H_ */