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Commit 7bc570c8 authored by YOSHIFUJI Hideaki's avatar YOSHIFUJI Hideaki
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[IPV6] MROUTE: Support multicast forwarding. 

Based on ancient patch by Mickael Hoerdt
<hoerdt@clarinet.u-strasbg.fr>, which is available at
<http://www-r2.u-strasbg.fr/~hoerdt/dev/linux_ipv6_mforwarding/patch-linux-ipv6-mforwarding-0.1a>.
Signed-off-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
parent 80a9492a
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Showing with 1754 additions and 30 deletions
include/linux/Kbuild
View file @ 7bc570c8
...@@ -261,6 +261,7 @@ unifdef-y += mempolicy.h ...@@ -261,6 +261,7 @@ unifdef-y += mempolicy.h
unifdef-y += mii.h unifdef-y += mii.h
unifdef-y += mman.h unifdef-y += mman.h
unifdef-y += mroute.h unifdef-y += mroute.h
unifdef-y += mroute6.h
unifdef-y += msdos_fs.h unifdef-y += msdos_fs.h
unifdef-y += msg.h unifdef-y += msg.h
unifdef-y += nbd.h unifdef-y += nbd.h
......
include/linux/ipv6.h
View file @ 7bc570c8
...@@ -159,6 +159,9 @@ struct ipv6_devconf { ...@@ -159,6 +159,9 @@ struct ipv6_devconf {
__s32 accept_source_route; __s32 accept_source_route;
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
__s32 optimistic_dad; __s32 optimistic_dad;
#endif
#ifdef CONFIG_IPV6_MROUTE
__s32 mc_forwarding;
#endif #endif
void *sysctl; void *sysctl;
}; };
...@@ -190,6 +193,7 @@ enum { ...@@ -190,6 +193,7 @@ enum {
DEVCONF_PROXY_NDP, DEVCONF_PROXY_NDP,
DEVCONF_OPTIMISTIC_DAD, DEVCONF_OPTIMISTIC_DAD,
DEVCONF_ACCEPT_SOURCE_ROUTE, DEVCONF_ACCEPT_SOURCE_ROUTE,
DEVCONF_MC_FORWARDING,
DEVCONF_MAX DEVCONF_MAX
}; };
...@@ -230,6 +234,7 @@ struct inet6_skb_parm { ...@@ -230,6 +234,7 @@ struct inet6_skb_parm {
#endif #endif
#define IP6SKB_XFRM_TRANSFORMED 1 #define IP6SKB_XFRM_TRANSFORMED 1
#define IP6SKB_FORWARDED 2
}; };
#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
......
include/linux/mroute6.h 0 → 100644
View file @ 7bc570c8
#ifndef __LINUX_MROUTE6_H
#define __LINUX_MROUTE6_H
#include <linux/types.h>
#include <linux/sockios.h>
/*
* Based on the MROUTING 3.5 defines primarily to keep
* source compatibility with BSD.
*
* See the pim6sd code for the original history.
*
* Protocol Independent Multicast (PIM) data structures included
* Carlos Picoto (cap@di.fc.ul.pt)
*
*/
#define MRT6_BASE 200
#define MRT6_INIT (MRT6_BASE) /* Activate the kernel mroute code */
#define MRT6_DONE (MRT6_BASE+1) /* Shutdown the kernel mroute */
#define MRT6_ADD_MIF (MRT6_BASE+2) /* Add a virtual interface */
#define MRT6_DEL_MIF (MRT6_BASE+3) /* Delete a virtual interface */
#define MRT6_ADD_MFC (MRT6_BASE+4) /* Add a multicast forwarding entry */
#define MRT6_DEL_MFC (MRT6_BASE+5) /* Delete a multicast forwarding entry */
#define MRT6_VERSION (MRT6_BASE+6) /* Get the kernel multicast version */
#define SIOCGETMIFCNT_IN6 SIOCPROTOPRIVATE /* IP protocol privates */
#define SIOCGETSGCNT_IN6 (SIOCPROTOPRIVATE+1)
#define SIOCGETRPF (SIOCPROTOPRIVATE+2)
#define MAXMIFS 32
typedef unsigned long mifbitmap_t; /* User mode code depends on this lot */
typedef unsigned short mifi_t;
#define ALL_MIFS ((mifi_t)(-1))
#ifndef IF_SETSIZE
#define IF_SETSIZE 256
#endif
typedef __u32 if_mask;
#define NIFBITS (sizeof(if_mask) * 8) /* bits per mask */
#if !defined(__KERNEL__) && !defined(DIV_ROUND_UP)
#define DIV_ROUND_UP(x,y) (((x) + ((y) - 1)) / (y))
#endif
typedef struct if_set {
if_mask ifs_bits[DIV_ROUND_UP(IF_SETSIZE, NIFBITS)];
} if_set;
#define IF_SET(n, p) ((p)->ifs_bits[(n)/NIFBITS] |= (1 << ((n) % NIFBITS)))
#define IF_CLR(n, p) ((p)->ifs_bits[(n)/NIFBITS] &= ~(1 << ((n) % NIFBITS)))
#define IF_ISSET(n, p) ((p)->ifs_bits[(n)/NIFBITS] & (1 << ((n) % NIFBITS)))
#define IF_COPY(f, t) bcopy(f, t, sizeof(*(f)))
#define IF_ZERO(p) bzero(p, sizeof(*(p)))
/*
* Passed by mrouted for an MRT_ADD_MIF - again we use the
* mrouted 3.6 structures for compatibility
*/
struct mif6ctl {
mifi_t mif6c_mifi; /* Index of MIF */
unsigned char mif6c_flags; /* MIFF_ flags */
unsigned char vifc_threshold; /* ttl limit */
u_short mif6c_pifi; /* the index of the physical IF */
unsigned int vifc_rate_limit; /* Rate limiter values (NI) */
};
#define MIFF_REGISTER 0x1 /* register vif */
/*
* Cache manipulation structures for mrouted and PIMd
*/
struct mf6cctl
{
struct sockaddr_in6 mf6cc_origin; /* Origin of mcast */
struct sockaddr_in6 mf6cc_mcastgrp; /* Group in question */
mifi_t mf6cc_parent; /* Where it arrived */
struct if_set mf6cc_ifset; /* Where it is going */
};
/*
* Group count retrieval for pim6sd
*/
struct sioc_sg_req6
{
struct sockaddr_in6 src;
struct sockaddr_in6 grp;
unsigned long pktcnt;
unsigned long bytecnt;
unsigned long wrong_if;
};
/*
* To get vif packet counts
*/
struct sioc_mif_req6
{
mifi_t mifi; /* Which iface */
unsigned long icount; /* In packets */
unsigned long ocount; /* Out packets */
unsigned long ibytes; /* In bytes */
unsigned long obytes; /* Out bytes */
};
/*
* That's all usermode folks
*/
#ifdef __KERNEL__
#include <linux/skbuff.h> /* for struct sk_buff_head */
struct net_device;
struct inet6_dev *ipv6_find_idev(struct net_device *dev);
#ifdef CONFIG_IPV6_MROUTE
static inline int ip6_mroute_opt(int opt)
{
return (opt >= MRT6_BASE) && (opt <= MRT6_BASE + 10);
}
#else
static inline int ip6_mroute_opt(int opt)
{
return 0;
}
#endif
struct sock;
extern int ip6_mroute_setsockopt(struct sock *, int, char __user *, int);
extern int ip6_mroute_getsockopt(struct sock *, int, char __user *, int __user *);
extern int ip6_mr_input(struct sk_buff *skb);
extern int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg);
extern void ip6_mr_init(void);
struct mif_device
{
struct net_device *dev; /* Device we are using */
unsigned long bytes_in,bytes_out;
unsigned long pkt_in,pkt_out; /* Statistics */
unsigned long rate_limit; /* Traffic shaping (NI) */
unsigned char threshold; /* TTL threshold */
unsigned short flags; /* Control flags */
int link; /* Physical interface index */
};
#define VIFF_STATIC 0x8000
struct mfc6_cache
{
struct mfc6_cache *next; /* Next entry on cache line */
struct in6_addr mf6c_mcastgrp; /* Group the entry belongs to */
struct in6_addr mf6c_origin; /* Source of packet */
mifi_t mf6c_parent; /* Source interface */
int mfc_flags; /* Flags on line */
union {
struct {
unsigned long expires;
struct sk_buff_head unresolved; /* Unresolved buffers */
} unres;
struct {
unsigned long last_assert;
int minvif;
int maxvif;
unsigned long bytes;
unsigned long pkt;
unsigned long wrong_if;
unsigned char ttls[MAXMIFS]; /* TTL thresholds */
} res;
} mfc_un;
};
#define MFC_STATIC 1
#define MFC_NOTIFY 2
#define MFC6_LINES 64
#define MFC6_HASH(a, g) (((__force u32)(a)->s6_addr32[0] ^ \
(__force u32)(a)->s6_addr32[1] ^ \
(__force u32)(a)->s6_addr32[2] ^ \
(__force u32)(a)->s6_addr32[3] ^ \
(__force u32)(g)->s6_addr32[0] ^ \
(__force u32)(g)->s6_addr32[1] ^ \
(__force u32)(g)->s6_addr32[2] ^ \
(__force u32)(g)->s6_addr32[3]) % MFC6_LINES)
#define MFC_ASSERT_THRESH (3*HZ) /* Maximal freq. of asserts */
#endif
#ifdef __KERNEL__
struct rtmsg;
extern int ip6mr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait);
#ifdef CONFIG_IPV6_MROUTE
extern struct sock *mroute6_socket;
extern int ip6mr_sk_done(struct sock *sk);
#else
#define mroute6_socket NULL
static inline int ip6mr_sk_done(struct sock *sk) { return 0; }
#endif
#endif
/*
* Structure used to communicate from kernel to multicast router.
* We'll overlay the structure onto an MLD header (not an IPv6 heder like igmpmsg{}
* used for IPv4 implementation). This is because this structure will be passed via an
* IPv6 raw socket, on wich an application will only receiver the payload i.e the data after
* the IPv6 header and all the extension headers. (See section 3 of RFC 3542)
*/
struct mrt6msg {
#define MRT6MSG_NOCACHE 1
__u8 im6_mbz; /* must be zero */
__u8 im6_msgtype; /* what type of message */
__u16 im6_mif; /* mif rec'd on */
__u32 im6_pad; /* padding for 64 bit arch */
struct in6_addr im6_src, im6_dst;
};
#endif
net/ipv6/Kconfig
View file @ 7bc570c8
...@@ -209,3 +209,10 @@ config IPV6_SUBTREES ...@@ -209,3 +209,10 @@ config IPV6_SUBTREES
If unsure, say N. If unsure, say N.
config IPV6_MROUTE
bool "IPv6: multicast routing (EXPERIMENTAL)"
depends on IPV6 && EXPERIMENTAL
---help---
Experimental support for IPv6 multicast forwarding.
If unsure, say N.
net/ipv6/Makefile
View file @ 7bc570c8
...@@ -11,6 +11,8 @@ ipv6-objs := af_inet6.o anycast.o ip6_output.o ip6_input.o addrconf.o \ ...@@ -11,6 +11,8 @@ ipv6-objs := af_inet6.o anycast.o ip6_output.o ip6_input.o addrconf.o \
exthdrs.o datagram.o ip6_flowlabel.o inet6_connection_sock.o exthdrs.o datagram.o ip6_flowlabel.o inet6_connection_sock.o
ipv6-$(CONFIG_SYSCTL) = sysctl_net_ipv6.o ipv6-$(CONFIG_SYSCTL) = sysctl_net_ipv6.o
ipv6-$(CONFIG_IPV6_MROUTE) += ip6mr.o
ipv6-$(CONFIG_XFRM) += xfrm6_policy.o xfrm6_state.o xfrm6_input.o \ ipv6-$(CONFIG_XFRM) += xfrm6_policy.o xfrm6_state.o xfrm6_input.o \
xfrm6_output.o xfrm6_output.o
ipv6-$(CONFIG_NETFILTER) += netfilter.o ipv6-$(CONFIG_NETFILTER) += netfilter.o
......
net/ipv6/addrconf.c
View file @ 7bc570c8
...@@ -412,7 +412,7 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev) ...@@ -412,7 +412,7 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
return ndev; return ndev;
} }
static struct inet6_dev * ipv6_find_idev(struct net_device *dev) struct inet6_dev * ipv6_find_idev(struct net_device *dev)
{ {
struct inet6_dev *idev; struct inet6_dev *idev;
...@@ -3547,6 +3547,9 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, ...@@ -3547,6 +3547,9 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
#endif #endif
#ifdef CONFIG_IPV6_MROUTE
array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
#endif
} }
static inline size_t inet6_if_nlmsg_size(void) static inline size_t inet6_if_nlmsg_size(void)
...@@ -4094,6 +4097,16 @@ static struct addrconf_sysctl_table ...@@ -4094,6 +4097,16 @@ static struct addrconf_sysctl_table
.proc_handler = &proc_dointvec, .proc_handler = &proc_dointvec,
}, },
#endif
#ifdef CONFIG_IPV6_MROUTE
{
.ctl_name = CTL_UNNUMBERED,
.procname = "mc_forwarding",
.data = &ipv6_devconf.mc_forwarding,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
#endif #endif
{ {
.ctl_name = 0, /* sentinel */ .ctl_name = 0, /* sentinel */
......
net/ipv6/af_inet6.c
View file @ 7bc570c8
...@@ -61,6 +61,9 @@ ...@@ -61,6 +61,9 @@
#include <asm/uaccess.h> #include <asm/uaccess.h>
#include <asm/system.h> #include <asm/system.h>
#ifdef CONFIG_IPV6_MROUTE
#include <linux/mroute6.h>
#endif
MODULE_AUTHOR("Cast of dozens"); MODULE_AUTHOR("Cast of dozens");
MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
...@@ -953,6 +956,9 @@ static int __init inet6_init(void) ...@@ -953,6 +956,9 @@ static int __init inet6_init(void)
err = icmpv6_init(); err = icmpv6_init();
if (err) if (err)
goto icmp_fail; goto icmp_fail;
#ifdef CONFIG_IPV6_MROUTE
ip6_mr_init();
#endif
err = ndisc_init(); err = ndisc_init();
if (err) if (err)
goto ndisc_fail; goto ndisc_fail;
......
net/ipv6/ip6_input.c
View file @ 7bc570c8
...@@ -29,6 +29,7 @@ ...@@ -29,6 +29,7 @@
#include <linux/netdevice.h> #include <linux/netdevice.h>
#include <linux/in6.h> #include <linux/in6.h>
#include <linux/icmpv6.h> #include <linux/icmpv6.h>
#include <linux/mroute6.h>
#include <linux/netfilter.h> #include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h> #include <linux/netfilter_ipv6.h>
...@@ -236,36 +237,84 @@ int ip6_mc_input(struct sk_buff *skb) ...@@ -236,36 +237,84 @@ int ip6_mc_input(struct sk_buff *skb)
hdr = ipv6_hdr(skb); hdr = ipv6_hdr(skb);
deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL); deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
#ifdef CONFIG_IPV6_MROUTE
/* /*
* IPv6 multicast router mode isnt currently supported. * IPv6 multicast router mode is now supported ;)
*/ */
#if 0 if (ipv6_devconf.mc_forwarding &&
if (ipv6_config.multicast_route) { likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) {
int addr_type; /*
* Okay, we try to forward - split and duplicate
addr_type = ipv6_addr_type(&hdr->daddr); * packets.
*/
if (!(addr_type & (IPV6_ADDR_LOOPBACK | IPV6_ADDR_LINKLOCAL))) { struct sk_buff *skb2;
struct sk_buff *skb2; struct inet6_skb_parm *opt = IP6CB(skb);
struct dst_entry *dst;
/* Check for MLD */
if (unlikely(opt->ra)) {
/* Check if this is a mld message */
u8 *ptr = skb_network_header(skb) + opt->ra;
struct icmp6hdr *icmp6;
u8 nexthdr = hdr->nexthdr;
int offset;
/* Check if the value of Router Alert
* is for MLD (0x0000).
*/
if ((ptr[2] | ptr[3]) == 0) {
if (!ipv6_ext_hdr(nexthdr)) {
/* BUG */
goto discard;
}
offset = ipv6_skip_exthdr(skb, sizeof(*hdr),
&nexthdr);
if (offset < 0)
goto discard;
if (nexthdr != IPPROTO_ICMPV6)
goto discard;
if (!pskb_may_pull(skb, (skb_network_header(skb) +
offset + 1 - skb->data)))
goto discard;
icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);
switch (icmp6->icmp6_type) {
case ICMPV6_MGM_QUERY:
case ICMPV6_MGM_REPORT:
case ICMPV6_MGM_REDUCTION:
case ICMPV6_MLD2_REPORT:
break;
default:
/* Bogus */
goto discard;
}
deliver = 1;
goto out;
}
/* unknown RA - process it normally */
}
dst = skb->dst; if (deliver)
skb2 = skb_clone(skb, GFP_ATOMIC);
else {
skb2 = skb;
skb = NULL;
}
if (deliver) { if (skb2) {
skb2 = skb_clone(skb, GFP_ATOMIC); skb2->dev = skb2->dst->dev;
dst_output(skb2); ip6_mr_input(skb2);
} else {
dst_output(skb);
return 0;
}
} }
} }
#endif #endif
out:
if (likely(deliver)) { if (likely(deliver)) {
ip6_input(skb); ip6_input(skb);
return 0; return 0;
} }
discard:
/* discard */ /* discard */
kfree_skb(skb); kfree_skb(skb);
......
net/ipv6/ip6_output.c
View file @ 7bc570c8
...@@ -55,6 +55,7 @@ ...@@ -55,6 +55,7 @@
#include <net/icmp.h> #include <net/icmp.h>
#include <net/xfrm.h> #include <net/xfrm.h>
#include <net/checksum.h> #include <net/checksum.h>
#include <linux/mroute6.h>
static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
...@@ -137,8 +138,9 @@ static int ip6_output2(struct sk_buff *skb) ...@@ -137,8 +138,9 @@ static int ip6_output2(struct sk_buff *skb)
struct inet6_dev *idev = ip6_dst_idev(skb->dst); struct inet6_dev *idev = ip6_dst_idev(skb->dst);
if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) && if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) &&
ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr, ((mroute6_socket && !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
&ipv6_hdr(skb)->saddr)) { ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
&ipv6_hdr(skb)->saddr))) {
struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
/* Do not check for IFF_ALLMULTI; multicast routing /* Do not check for IFF_ALLMULTI; multicast routing
......
net/ipv6/ip6mr.c 0 → 100644
View file @ 7bc570c8
/*
* Linux IPv6 multicast routing support for BSD pim6sd
* Based on net/ipv4/ipmr.c.
*
* (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr>
* LSIIT Laboratory, Strasbourg, France
* (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com>
* 6WIND, Paris, France
* Copyright (C)2007,2008 USAGI/WIDE Project
* YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <asm/system.h>
#include <asm/uaccess.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/igmp.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/mroute.h>
#include <linux/init.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/icmp.h>
#include <net/udp.h>
#include <net/raw.h>
#include <net/route.h>
#include <linux/notifier.h>
#include <linux/if_arp.h>
#include <linux/netfilter_ipv4.h>
#include <net/ipip.h>
#include <net/checksum.h>
#include <net/netlink.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
#include <linux/mroute6.h>
#include <net/addrconf.h>
#include <linux/netfilter_ipv6.h>
struct sock *mroute6_socket;
/* Big lock, protecting vif table, mrt cache and mroute socket state.
Note that the changes are semaphored via rtnl_lock.
*/
static DEFINE_RWLOCK(mrt_lock);
/*
* Multicast router control variables
*/
static struct mif_device vif6_table[MAXMIFS]; /* Devices */
static int maxvif;
#define MIF_EXISTS(idx) (vif6_table[idx].dev != NULL)
static struct mfc6_cache *mfc6_cache_array[MFC_LINES]; /* Forwarding cache */
static struct mfc6_cache *mfc_unres_queue; /* Queue of unresolved entries */
static atomic_t cache_resolve_queue_len; /* Size of unresolved */
/* Special spinlock for queue of unresolved entries */
static DEFINE_SPINLOCK(mfc_unres_lock);
/* We return to original Alan's scheme. Hash table of resolved
entries is changed only in process context and protected
with weak lock mrt_lock. Queue of unresolved entries is protected
with strong spinlock mfc_unres_lock.
In this case data path is free of exclusive locks at all.
*/
static struct kmem_cache *mrt_cachep __read_mostly;
static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache);
static int ip6mr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert);
static int ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm);
static struct timer_list ipmr_expire_timer;
#ifdef CONFIG_PROC_FS
struct ipmr_mfc_iter {
struct mfc6_cache **cache;
int ct;
};
static struct mfc6_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos)
{
struct mfc6_cache *mfc;
it->cache = mfc6_cache_array;
read_lock(&mrt_lock);
for (it->ct = 0; it->ct < ARRAY_SIZE(mfc6_cache_array); it->ct++)
for (mfc = mfc6_cache_array[it->ct]; mfc; mfc = mfc->next)
if (pos-- == 0)
return mfc;
read_unlock(&mrt_lock);
it->cache = &mfc_unres_queue;
spin_lock_bh(&mfc_unres_lock);
for (mfc = mfc_unres_queue; mfc; mfc = mfc->next)
if (pos-- == 0)
return mfc;
spin_unlock_bh(&mfc_unres_lock);
it->cache = NULL;
return NULL;
}
/*
* The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif
*/
struct ipmr_vif_iter {
int ct;
};
static struct mif_device *ip6mr_vif_seq_idx(struct ipmr_vif_iter *iter,
loff_t pos)
{
for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) {
if (!MIF_EXISTS(iter->ct))
continue;
if (pos-- == 0)
return &vif6_table[iter->ct];
}
return NULL;
}
static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(mrt_lock)
{
read_lock(&mrt_lock);
return (*pos ? ip6mr_vif_seq_idx(seq->private, *pos - 1)
: SEQ_START_TOKEN);
}
static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct ipmr_vif_iter *iter = seq->private;
++*pos;
if (v == SEQ_START_TOKEN)
return ip6mr_vif_seq_idx(iter, 0);
while (++iter->ct < maxvif) {
if (!MIF_EXISTS(iter->ct))
continue;
return &vif6_table[iter->ct];
}
return NULL;
}
static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
__releases(mrt_lock)
{
read_unlock(&mrt_lock);
}
static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
{
if (v == SEQ_START_TOKEN) {
seq_puts(seq,
"Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
} else {
const struct mif_device *vif = v;
const char *name = vif->dev ? vif->dev->name : "none";
seq_printf(seq,
"%2Zd %-10s %8ld %7ld %8ld %7ld %05X\n",
vif - vif6_table,
name, vif->bytes_in, vif->pkt_in,
vif->bytes_out, vif->pkt_out,
vif->flags);
}
return 0;
}
static struct seq_operations ip6mr_vif_seq_ops = {
.start = ip6mr_vif_seq_start,
.next = ip6mr_vif_seq_next,
.stop = ip6mr_vif_seq_stop,
.show = ip6mr_vif_seq_show,
};
static int ip6mr_vif_open(struct inode *inode, struct file *file)
{
return seq_open_private(file, &ip6mr_vif_seq_ops,
sizeof(struct ipmr_vif_iter));
}
static struct file_operations ip6mr_vif_fops = {
.owner = THIS_MODULE,
.open = ip6mr_vif_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
{
return (*pos ? ipmr_mfc_seq_idx(seq->private, *pos - 1)
: SEQ_START_TOKEN);
}
static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct mfc6_cache *mfc = v;
struct ipmr_mfc_iter *it = seq->private;
++*pos;
if (v == SEQ_START_TOKEN)
return ipmr_mfc_seq_idx(seq->private, 0);
if (mfc->next)
return mfc->next;
if (it->cache == &mfc_unres_queue)
goto end_of_list;
BUG_ON(it->cache != mfc6_cache_array);
while (++it->ct < ARRAY_SIZE(mfc6_cache_array)) {
mfc = mfc6_cache_array[it->ct];
if (mfc)
return mfc;
}
/* exhausted cache_array, show unresolved */
read_unlock(&mrt_lock);
it->cache = &mfc_unres_queue;
it->ct = 0;
spin_lock_bh(&mfc_unres_lock);
mfc = mfc_unres_queue;
if (mfc)
return mfc;
end_of_list:
spin_unlock_bh(&mfc_unres_lock);
it->cache = NULL;
return NULL;
}
static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
{
struct ipmr_mfc_iter *it = seq->private;
if (it->cache == &mfc_unres_queue)
spin_unlock_bh(&mfc_unres_lock);
else if (it->cache == mfc6_cache_array)
read_unlock(&mrt_lock);
}
static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
{
int n;
if (v == SEQ_START_TOKEN) {
seq_puts(seq,
"Group "
"Origin "
"Iif Pkts Bytes Wrong Oifs\n");
} else {
const struct mfc6_cache *mfc = v;
const struct ipmr_mfc_iter *it = seq->private;
seq_printf(seq,
NIP6_FMT " " NIP6_FMT " %-3d %8ld %8ld %8ld",
NIP6(mfc->mf6c_mcastgrp), NIP6(mfc->mf6c_origin),
mfc->mf6c_parent,
mfc->mfc_un.res.pkt,
mfc->mfc_un.res.bytes,
mfc->mfc_un.res.wrong_if);
if (it->cache != &mfc_unres_queue) {
for (n = mfc->mfc_un.res.minvif;
n < mfc->mfc_un.res.maxvif; n++) {
if (MIF_EXISTS(n) &&
mfc->mfc_un.res.ttls[n] < 255)
seq_printf(seq,
" %2d:%-3d",
n, mfc->mfc_un.res.ttls[n]);
}
}
seq_putc(seq, '\n');
}
return 0;
}
static struct seq_operations ipmr_mfc_seq_ops = {
.start = ipmr_mfc_seq_start,
.next = ipmr_mfc_seq_next,
.stop = ipmr_mfc_seq_stop,
.show = ipmr_mfc_seq_show,
};
static int ipmr_mfc_open(struct inode *inode, struct file *file)
{
return seq_open_private(file, &ipmr_mfc_seq_ops,
sizeof(struct ipmr_mfc_iter));
}
static struct file_operations ip6mr_mfc_fops = {
.owner = THIS_MODULE,
.open = ipmr_mfc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
#endif
/*
* Delete a VIF entry
*/
static int mif6_delete(int vifi)
{
struct mif_device *v;
struct net_device *dev;
if (vifi < 0 || vifi >= maxvif)
return -EADDRNOTAVAIL;
v = &vif6_table[vifi];
write_lock_bh(&mrt_lock);
dev = v->dev;
v->dev = NULL;
if (!dev) {
write_unlock_bh(&mrt_lock);
return -EADDRNOTAVAIL;
}
if (vifi + 1 == maxvif) {
int tmp;
for (tmp = vifi - 1; tmp >= 0; tmp--) {
if (MIF_EXISTS(tmp))
break;
}
maxvif = tmp + 1;
}
write_unlock_bh(&mrt_lock);
dev_set_allmulti(dev, -1);
if (v->flags & MIFF_REGISTER)
unregister_netdevice(dev);
dev_put(dev);
return 0;
}
/* Destroy an unresolved cache entry, killing queued skbs
and reporting error to netlink readers.
*/
static void ip6mr_destroy_unres(struct mfc6_cache *c)
{
struct sk_buff *skb;
atomic_dec(&cache_resolve_queue_len);
while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
if (ipv6_hdr(skb)->version == 0) {
struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
nlh->nlmsg_type = NLMSG_ERROR;
nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
skb_trim(skb, nlh->nlmsg_len);
((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT;
rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid);
} else
kfree_skb(skb);
}
kmem_cache_free(mrt_cachep, c);
}
/* Single timer process for all the unresolved queue. */
static void ipmr_do_expire_process(unsigned long dummy)
{
unsigned long now = jiffies;
unsigned long expires = 10 * HZ;
struct mfc6_cache *c, **cp;
cp = &mfc_unres_queue;
while ((c = *cp) != NULL) {
if (time_after(c->mfc_un.unres.expires, now)) {
/* not yet... */
unsigned long interval = c->mfc_un.unres.expires - now;
if (interval < expires)
expires = interval;
cp = &c->next;
continue;
}
*cp = c->next;
ip6mr_destroy_unres(c);
}
if (atomic_read(&cache_resolve_queue_len))
mod_timer(&ipmr_expire_timer, jiffies + expires);
}
static void ipmr_expire_process(unsigned long dummy)
{
if (!spin_trylock(&mfc_unres_lock)) {
mod_timer(&ipmr_expire_timer, jiffies + 1);
return;
}
if (atomic_read(&cache_resolve_queue_len))
ipmr_do_expire_process(dummy);
spin_unlock(&mfc_unres_lock);
}
/* Fill oifs list. It is called under write locked mrt_lock. */
static void ip6mr_update_thresholds(struct mfc6_cache *cache, unsigned char *ttls)
{
int vifi;
cache->mfc_un.res.minvif = MAXVIFS;
cache->mfc_un.res.maxvif = 0;
memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
for (vifi = 0; vifi < maxvif; vifi++) {
if (MIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) {
cache->mfc_un.res.ttls[vifi] = ttls[vifi];
if (cache->mfc_un.res.minvif > vifi)
cache->mfc_un.res.minvif = vifi;
if (cache->mfc_un.res.maxvif <= vifi)
cache->mfc_un.res.maxvif = vifi + 1;
}
}
}
static int mif6_add(struct mif6ctl *vifc, int mrtsock)
{
int vifi = vifc->mif6c_mifi;
struct mif_device *v = &vif6_table[vifi];
struct net_device *dev;
/* Is vif busy ? */
if (MIF_EXISTS(vifi))
return -EADDRINUSE;
switch (vifc->mif6c_flags) {
case 0:
dev = dev_get_by_index(&init_net, vifc->mif6c_pifi);
if (!dev)
return -EADDRNOTAVAIL;
dev_put(dev);
break;
default:
return -EINVAL;
}
dev_set_allmulti(dev, 1);
/*
* Fill in the VIF structures
*/
v->rate_limit = vifc->vifc_rate_limit;
v->flags = vifc->mif6c_flags;
if (!mrtsock)
v->flags |= VIFF_STATIC;
v->threshold = vifc->vifc_threshold;
v->bytes_in = 0;
v->bytes_out = 0;
v->pkt_in = 0;
v->pkt_out = 0;
v->link = dev->ifindex;
if (v->flags & MIFF_REGISTER)
v->link = dev->iflink;
/* And finish update writing critical data */
write_lock_bh(&mrt_lock);
dev_hold(dev);
v->dev = dev;
if (vifi + 1 > maxvif)
maxvif = vifi + 1;
write_unlock_bh(&mrt_lock);
return 0;
}
static struct mfc6_cache *ip6mr_cache_find(struct in6_addr *origin, struct in6_addr *mcastgrp)
{
int line = MFC6_HASH(mcastgrp, origin);
struct mfc6_cache *c;
for (c = mfc6_cache_array[line]; c; c = c->next) {
if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
break;
}
return c;
}
/*
* Allocate a multicast cache entry
*/
static struct mfc6_cache *ip6mr_cache_alloc(void)
{
struct mfc6_cache *c = kmem_cache_alloc(mrt_cachep, GFP_KERNEL);
if (c == NULL)
return NULL;
memset(c, 0, sizeof(*c));
c->mfc_un.res.minvif = MAXVIFS;
return c;
}
static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
{
struct mfc6_cache *c = kmem_cache_alloc(mrt_cachep, GFP_ATOMIC);
if (c == NULL)
return NULL;
memset(c, 0, sizeof(*c));
skb_queue_head_init(&c->mfc_un.unres.unresolved);
c->mfc_un.unres.expires = jiffies + 10 * HZ;
return c;
}
/*
* A cache entry has gone into a resolved state from queued
*/
static void ip6mr_cache_resolve(struct mfc6_cache *uc, struct mfc6_cache *c)
{
struct sk_buff *skb;
/*
* Play the pending entries through our router
*/
while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
if (ipv6_hdr(skb)->version == 0) {
int err;
struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
if (ip6mr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) {
nlh->nlmsg_len = skb->tail - (u8 *)nlh;
} else {
nlh->nlmsg_type = NLMSG_ERROR;
nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
skb_trim(skb, nlh->nlmsg_len);
((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE;
}
err = rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid);
} else
ip6_mr_forward(skb, c);
}
}
/*
* Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd
* expects the following bizarre scheme.
*
* Called under mrt_lock.
*/
static int ip6mr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert)
{
struct sk_buff *skb;
struct mrt6msg *msg;
int ret;
skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
if (!skb)
return -ENOBUFS;
/* I suppose that internal messages
* do not require checksums */
skb->ip_summed = CHECKSUM_UNNECESSARY;
/*
* Copy the IP header
*/
skb_put(skb, sizeof(struct ipv6hdr));
skb_reset_network_header(skb);
skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
/*
* Add our header
*/
skb_put(skb, sizeof(*msg));
skb_reset_transport_header(skb);
msg = (struct mrt6msg *)skb_transport_header(skb);
msg->im6_mbz = 0;
msg->im6_msgtype = assert;
msg->im6_mif = vifi;
msg->im6_pad = 0;
ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr);
ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr);
skb->dst = dst_clone(pkt->dst);
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb_pull(skb, sizeof(struct ipv6hdr));
if (mroute6_socket == NULL) {
kfree_skb(skb);
return -EINVAL;
}
/*
* Deliver to user space multicast routing algorithms
*/
if ((ret = sock_queue_rcv_skb(mroute6_socket, skb)) < 0) {
if (net_ratelimit())
printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n");
kfree_skb(skb);
}
return ret;
}
/*
* Queue a packet for resolution. It gets locked cache entry!
*/
static int
ip6mr_cache_unresolved(vifi_t vifi, struct sk_buff *skb)
{
int err;
struct mfc6_cache *c;
spin_lock_bh(&mfc_unres_lock);
for (c = mfc_unres_queue; c; c = c->next) {
if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr))
break;
}
if (c == NULL) {
/*
* Create a new entry if allowable
*/
if (atomic_read(&cache_resolve_queue_len) >= 10 ||
(c = ip6mr_cache_alloc_unres()) == NULL) {
spin_unlock_bh(&mfc_unres_lock);
kfree_skb(skb);
return -ENOBUFS;
}
/*
* Fill in the new cache entry
*/
c->mf6c_parent = -1;
c->mf6c_origin = ipv6_hdr(skb)->saddr;
c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
/*
* Reflect first query at pim6sd
*/
if ((err = ip6mr_cache_report(skb, vifi, MRT6MSG_NOCACHE)) < 0) {
/* If the report failed throw the cache entry
out - Brad Parker
*/
spin_unlock_bh(&mfc_unres_lock);
kmem_cache_free(mrt_cachep, c);
kfree_skb(skb);
return err;
}
atomic_inc(&cache_resolve_queue_len);
c->next = mfc_unres_queue;
mfc_unres_queue = c;
ipmr_do_expire_process(1);
}
/*
* See if we can append the packet
*/
if (c->mfc_un.unres.unresolved.qlen > 3) {
kfree_skb(skb);
err = -ENOBUFS;
} else {
skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
err = 0;
}
spin_unlock_bh(&mfc_unres_lock);
return err;
}
/*
* MFC6 cache manipulation by user space
*/
static int ip6mr_mfc_delete(struct mf6cctl *mfc)
{
int line;
struct mfc6_cache *c, **cp;
line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
for (cp = &mfc6_cache_array[line]; (c = *cp) != NULL; cp = &c->next) {
if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) {
write_lock_bh(&mrt_lock);
*cp = c->next;
write_unlock_bh(&mrt_lock);
kmem_cache_free(mrt_cachep, c);
return 0;
}
}
return -ENOENT;
}
static int ip6mr_device_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct net_device *dev = ptr;
struct mif_device *v;
int ct;
if (dev_net(dev) != &init_net)
return NOTIFY_DONE;
if (event != NETDEV_UNREGISTER)
return NOTIFY_DONE;
v = &vif6_table[0];
for (ct = 0; ct < maxvif; ct++, v++) {
if (v->dev == dev)
mif6_delete(ct);
}
return NOTIFY_DONE;
}
static struct notifier_block ip6_mr_notifier = {
.notifier_call = ip6mr_device_event
};
/*
* Setup for IP multicast routing
*/
void __init ip6_mr_init(void)
{
mrt_cachep = kmem_cache_create("ip6_mrt_cache",
sizeof(struct mfc6_cache),
0, SLAB_HWCACHE_ALIGN,
NULL);
if (!mrt_cachep)
panic("cannot allocate ip6_mrt_cache");
setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0);
register_netdevice_notifier(&ip6_mr_notifier);
#ifdef CONFIG_PROC_FS
proc_net_fops_create(&init_net, "ip6_mr_vif", 0, &ip6mr_vif_fops);
proc_net_fops_create(&init_net, "ip6_mr_cache", 0, &ip6mr_mfc_fops);
#endif
}
static int ip6mr_mfc_add(struct mf6cctl *mfc, int mrtsock)
{
int line;
struct mfc6_cache *uc, *c, **cp;
unsigned char ttls[MAXVIFS];
int i;
memset(ttls, 255, MAXVIFS);
for (i = 0; i < MAXVIFS; i++) {
if (IF_ISSET(i, &mfc->mf6cc_ifset))
ttls[i] = 1;
}
line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
for (cp = &mfc6_cache_array[line]; (c = *cp) != NULL; cp = &c->next) {
if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr))
break;
}
if (c != NULL) {
write_lock_bh(&mrt_lock);
c->mf6c_parent = mfc->mf6cc_parent;
ip6mr_update_thresholds(c, ttls);
if (!mrtsock)
c->mfc_flags |= MFC_STATIC;
write_unlock_bh(&mrt_lock);
return 0;
}
if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
return -EINVAL;
c = ip6mr_cache_alloc();
if (c == NULL)
return -ENOMEM;
c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
c->mf6c_parent = mfc->mf6cc_parent;
ip6mr_update_thresholds(c, ttls);
if (!mrtsock)
c->mfc_flags |= MFC_STATIC;
write_lock_bh(&mrt_lock);
c->next = mfc6_cache_array[line];
mfc6_cache_array[line] = c;
write_unlock_bh(&mrt_lock);
/*
* Check to see if we resolved a queued list. If so we
* need to send on the frames and tidy up.
*/
spin_lock_bh(&mfc_unres_lock);
for (cp = &mfc_unres_queue; (uc = *cp) != NULL;
cp = &uc->next) {
if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
*cp = uc->next;
if (atomic_dec_and_test(&cache_resolve_queue_len))
del_timer(&ipmr_expire_timer);
break;
}
}
spin_unlock_bh(&mfc_unres_lock);
if (uc) {
ip6mr_cache_resolve(uc, c);
kmem_cache_free(mrt_cachep, uc);
}
return 0;
}
/*
* Close the multicast socket, and clear the vif tables etc
*/
static void mroute_clean_tables(struct sock *sk)
{
int i;
/*
* Shut down all active vif entries
*/
for (i = 0; i < maxvif; i++) {
if (!(vif6_table[i].flags & VIFF_STATIC))
mif6_delete(i);
}
/*
* Wipe the cache
*/
for (i = 0; i < ARRAY_SIZE(mfc6_cache_array); i++) {
struct mfc6_cache *c, **cp;
cp = &mfc6_cache_array[i];
while ((c = *cp) != NULL) {
if (c->mfc_flags & MFC_STATIC) {
cp = &c->next;
continue;
}
write_lock_bh(&mrt_lock);
*cp = c->next;
write_unlock_bh(&mrt_lock);
kmem_cache_free(mrt_cachep, c);
}
}
if (atomic_read(&cache_resolve_queue_len) != 0) {
struct mfc6_cache *c;
spin_lock_bh(&mfc_unres_lock);
while (mfc_unres_queue != NULL) {
c = mfc_unres_queue;
mfc_unres_queue = c->next;
spin_unlock_bh(&mfc_unres_lock);
ip6mr_destroy_unres(c);
spin_lock_bh(&mfc_unres_lock);
}
spin_unlock_bh(&mfc_unres_lock);
}
}
static int ip6mr_sk_init(struct sock *sk)
{
int err = 0;
rtnl_lock();
write_lock_bh(&mrt_lock);
if (likely(mroute6_socket == NULL))
mroute6_socket = sk;
else
err = -EADDRINUSE;
write_unlock_bh(&mrt_lock);
rtnl_unlock();
return err;
}
int ip6mr_sk_done(struct sock *sk)
{
int err = 0;
rtnl_lock();
if (sk == mroute6_socket) {
write_lock_bh(&mrt_lock);
mroute6_socket = NULL;
write_unlock_bh(&mrt_lock);
mroute_clean_tables(sk);
} else
err = -EACCES;
rtnl_unlock();
return err;
}
/*
* Socket options and virtual interface manipulation. The whole
* virtual interface system is a complete heap, but unfortunately
* that's how BSD mrouted happens to think. Maybe one day with a proper
* MOSPF/PIM router set up we can clean this up.
*/
int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int optlen)
{
int ret;
struct mif6ctl vif;
struct mf6cctl mfc;
mifi_t mifi;
if (optname != MRT6_INIT) {
if (sk != mroute6_socket && !capable(CAP_NET_ADMIN))
return -EACCES;
}
switch (optname) {
case MRT6_INIT:
if (sk->sk_type != SOCK_RAW ||
inet_sk(sk)->num != IPPROTO_ICMPV6)
return -EOPNOTSUPP;
if (optlen < sizeof(int))
return -EINVAL;
return ip6mr_sk_init(sk);
case MRT6_DONE:
return ip6mr_sk_done(sk);
case MRT6_ADD_MIF:
if (optlen < sizeof(vif))
return -EINVAL;
if (copy_from_user(&vif, optval, sizeof(vif)))
return -EFAULT;
if (vif.mif6c_mifi >= MAXVIFS)
return -ENFILE;
rtnl_lock();
ret = mif6_add(&vif, sk == mroute6_socket);
rtnl_unlock();
return ret;
case MRT6_DEL_MIF:
if (optlen < sizeof(mifi_t))
return -EINVAL;
if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
return -EFAULT;
rtnl_lock();
ret = mif6_delete(mifi);
rtnl_unlock();
return ret;
/*
* Manipulate the forwarding caches. These live
* in a sort of kernel/user symbiosis.
*/
case MRT6_ADD_MFC:
case MRT6_DEL_MFC:
if (optlen < sizeof(mfc))
return -EINVAL;
if (copy_from_user(&mfc, optval, sizeof(mfc)))
return -EFAULT;
rtnl_lock();
if (optname == MRT6_DEL_MFC)
ret = ip6mr_mfc_delete(&mfc);
else
ret = ip6mr_mfc_add(&mfc, sk == mroute6_socket);
rtnl_unlock();
return ret;
/*
* Spurious command, or MRT_VERSION which you cannot
* set.
*/
default:
return -ENOPROTOOPT;
}
}
/*
* Getsock opt support for the multicast routing system.
*/
int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
int __user *optlen)
{
int olr;
int val;
switch (optname) {
case MRT6_VERSION:
val = 0x0305;
break;
default:
return -ENOPROTOOPT;
}
if (get_user(olr, optlen))
return -EFAULT;
olr = min_t(int, olr, sizeof(int));
if (olr < 0)
return -EINVAL;
if (put_user(olr, optlen))
return -EFAULT;
if (copy_to_user(optval, &val, olr))
return -EFAULT;
return 0;
}
/*
* The IP multicast ioctl support routines.
*/
int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
{
struct sioc_sg_req6 sr;
struct sioc_mif_req6 vr;
struct mif_device *vif;
struct mfc6_cache *c;
switch (cmd) {
case SIOCGETMIFCNT_IN6:
if (copy_from_user(&vr, arg, sizeof(vr)))
return -EFAULT;
if (vr.mifi >= maxvif)
return -EINVAL;
read_lock(&mrt_lock);
vif = &vif6_table[vr.mifi];
if (MIF_EXISTS(vr.mifi)) {
vr.icount = vif->pkt_in;
vr.ocount = vif->pkt_out;
vr.ibytes = vif->bytes_in;
vr.obytes = vif->bytes_out;
read_unlock(&mrt_lock);
if (copy_to_user(arg, &vr, sizeof(vr)))
return -EFAULT;
return 0;
}
read_unlock(&mrt_lock);
return -EADDRNOTAVAIL;
case SIOCGETSGCNT_IN6:
if (copy_from_user(&sr, arg, sizeof(sr)))
return -EFAULT;
read_lock(&mrt_lock);
c = ip6mr_cache_find(&sr.src.sin6_addr, &sr.grp.sin6_addr);
if (c) {
sr.pktcnt = c->mfc_un.res.pkt;
sr.bytecnt = c->mfc_un.res.bytes;
sr.wrong_if = c->mfc_un.res.wrong_if;
read_unlock(&mrt_lock);
if (copy_to_user(arg, &sr, sizeof(sr)))
return -EFAULT;
return 0;
}
read_unlock(&mrt_lock);
return -EADDRNOTAVAIL;
default:
return -ENOIOCTLCMD;
}
}
static inline int ip6mr_forward2_finish(struct sk_buff *skb)
{
/* XXX stats */
return dst_output(skb);
}
/*
* Processing handlers for ip6mr_forward
*/
static int ip6mr_forward2(struct sk_buff *skb, struct mfc6_cache *c, int vifi)
{
struct ipv6hdr *ipv6h;
struct mif_device *vif = &vif6_table[vifi];
struct net_device *dev;
struct dst_entry *dst;
struct flowi fl;
if (vif->dev == NULL)
goto out_free;
ipv6h = ipv6_hdr(skb);
fl = (struct flowi) {
.oif = vif->link,
.nl_u = { .ip6_u =
{ .daddr = ipv6h->daddr, }
}
};
dst = ip6_route_output(&init_net, NULL, &fl);
if (!dst)
goto out_free;
dst_release(skb->dst);
skb->dst = dst;
/*
* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
* not only before forwarding, but after forwarding on all output
* interfaces. It is clear, if mrouter runs a multicasting
* program, it should receive packets not depending to what interface
* program is joined.
* If we will not make it, the program will have to join on all
* interfaces. On the other hand, multihoming host (or router, but
* not mrouter) cannot join to more than one interface - it will
* result in receiving multiple packets.
*/
dev = vif->dev;
skb->dev = dev;
vif->pkt_out++;
vif->bytes_out += skb->len;
/* We are about to write */
/* XXX: extension headers? */
if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
goto out_free;
ipv6h = ipv6_hdr(skb);
ipv6h->hop_limit--;
IP6CB(skb)->flags |= IP6SKB_FORWARDED;
return NF_HOOK(PF_INET6, NF_INET_FORWARD, skb, skb->dev, dev,
ip6mr_forward2_finish);
out_free:
kfree_skb(skb);
return 0;
}
static int ip6mr_find_vif(struct net_device *dev)
{
int ct;
for (ct = maxvif - 1; ct >= 0; ct--) {
if (vif6_table[ct].dev == dev)
break;
}
return ct;
}
static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache)
{
int psend = -1;
int vif, ct;
vif = cache->mf6c_parent;
cache->mfc_un.res.pkt++;
cache->mfc_un.res.bytes += skb->len;
vif6_table[vif].pkt_in++;
vif6_table[vif].bytes_in += skb->len;
/*
* Forward the frame
*/
for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) {
if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) {
if (psend != -1) {
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
if (skb2)
ip6mr_forward2(skb2, cache, psend);
}
psend = ct;
}
}
if (psend != -1) {
ip6mr_forward2(skb, cache, psend);
return 0;
}
kfree_skb(skb);
return 0;
}
/*
* Multicast packets for forwarding arrive here
*/
int ip6_mr_input(struct sk_buff *skb)
{
struct mfc6_cache *cache;
read_lock(&mrt_lock);
cache = ip6mr_cache_find(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
/*
* No usable cache entry
*/
if (cache == NULL) {
int vif;
vif = ip6mr_find_vif(skb->dev);
if (vif >= 0) {
int err = ip6mr_cache_unresolved(vif, skb);
read_unlock(&mrt_lock);
return err;
}
read_unlock(&mrt_lock);
kfree_skb(skb);
return -ENODEV;
}
ip6_mr_forward(skb, cache);
read_unlock(&mrt_lock);
return 0;
}
static int
ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm)
{
int ct;
struct rtnexthop *nhp;
struct net_device *dev = vif6_table[c->mf6c_parent].dev;
u8 *b = skb->tail;
struct rtattr *mp_head;
if (dev)
RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex);
mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0));
for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
if (c->mfc_un.res.ttls[ct] < 255) {
if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
goto rtattr_failure;
nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
nhp->rtnh_flags = 0;
nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
nhp->rtnh_ifindex = vif6_table[ct].dev->ifindex;
nhp->rtnh_len = sizeof(*nhp);
}
}
mp_head->rta_type = RTA_MULTIPATH;
mp_head->rta_len = skb->tail - (u8 *)mp_head;
rtm->rtm_type = RTN_MULTICAST;
return 1;
rtattr_failure:
nlmsg_trim(skb, b);
return -EMSGSIZE;
}
int ip6mr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait)
{
int err;
struct mfc6_cache *cache;
struct rt6_info *rt = (struct rt6_info *)skb->dst;
read_lock(&mrt_lock);
cache = ip6mr_cache_find(&rt->rt6i_src.addr, &rt->rt6i_dst.addr);
if (!cache) {
struct sk_buff *skb2;
struct ipv6hdr *iph;
struct net_device *dev;
int vif;
if (nowait) {
read_unlock(&mrt_lock);
return -EAGAIN;
}
dev = skb->dev;
if (dev == NULL || (vif = ip6mr_find_vif(dev)) < 0) {
read_unlock(&mrt_lock);
return -ENODEV;
}
/* really correct? */
skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
if (!skb2) {
read_unlock(&mrt_lock);
return -ENOMEM;
}
skb_reset_transport_header(skb2);
skb_put(skb2, sizeof(struct ipv6hdr));
skb_reset_network_header(skb2);
iph = ipv6_hdr(skb2);
iph->version = 0;
iph->priority = 0;
iph->flow_lbl[0] = 0;
iph->flow_lbl[1] = 0;
iph->flow_lbl[2] = 0;
iph->payload_len = 0;
iph->nexthdr = IPPROTO_NONE;
iph->hop_limit = 0;
ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr);
ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr);
err = ip6mr_cache_unresolved(vif, skb2);
read_unlock(&mrt_lock);
return err;
}
if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
cache->mfc_flags |= MFC_NOTIFY;
err = ip6mr_fill_mroute(skb, cache, rtm);
read_unlock(&mrt_lock);
return err;
}
net/ipv6/ipv6_sockglue.c
View file @ 7bc570c8
...@@ -33,6 +33,7 @@ ...@@ -33,6 +33,7 @@
#include <linux/sockios.h> #include <linux/sockios.h>
#include <linux/net.h> #include <linux/net.h>
#include <linux/in6.h> #include <linux/in6.h>
#include <linux/mroute6.h>
#include <linux/netdevice.h> #include <linux/netdevice.h>
#include <linux/if_arp.h> #include <linux/if_arp.h>
#include <linux/init.h> #include <linux/init.h>
...@@ -118,6 +119,9 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, ...@@ -118,6 +119,9 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
valbool = (val!=0); valbool = (val!=0);
if (ip6_mroute_opt(optname))
return ip6_mroute_setsockopt(sk, optname, optval, optlen);
lock_sock(sk); lock_sock(sk);
switch (optname) { switch (optname) {
...@@ -790,6 +794,9 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, ...@@ -790,6 +794,9 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
int len; int len;
int val; int val;
if (ip6_mroute_opt(optname))
return ip6_mroute_getsockopt(sk, optname, optval, optlen);
if (get_user(len, optlen)) if (get_user(len, optlen))
return -EFAULT; return -EFAULT;
switch (optname) { switch (optname) {
......
net/ipv6/raw.c
View file @ 7bc570c8
...@@ -53,6 +53,7 @@ ...@@ -53,6 +53,7 @@
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
#include <net/mip6.h> #include <net/mip6.h>
#endif #endif
#include <linux/mroute6.h>
#include <net/raw.h> #include <net/raw.h>
#include <net/rawv6.h> #include <net/rawv6.h>
...@@ -1135,7 +1136,11 @@ static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) ...@@ -1135,7 +1136,11 @@ static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
} }
default: default:
#ifdef CONFIG_IPV6_MROUTE
return ip6mr_ioctl(sk, cmd, (void __user *)arg);
#else
return -ENOIOCTLCMD; return -ENOIOCTLCMD;
#endif
} }
} }
...@@ -1143,7 +1148,7 @@ static void rawv6_close(struct sock *sk, long timeout) ...@@ -1143,7 +1148,7 @@ static void rawv6_close(struct sock *sk, long timeout)
{ {
if (inet_sk(sk)->num == IPPROTO_RAW) if (inet_sk(sk)->num == IPPROTO_RAW)
ip6_ra_control(sk, -1, NULL); ip6_ra_control(sk, -1, NULL);
ip6mr_sk_done(sk);
sk_common_release(sk); sk_common_release(sk);
} }
......
net/ipv6/route.c
View file @ 7bc570c8
...@@ -36,6 +36,7 @@ ...@@ -36,6 +36,7 @@
#include <linux/route.h> #include <linux/route.h>
#include <linux/netdevice.h> #include <linux/netdevice.h>
#include <linux/in6.h> #include <linux/in6.h>
#include <linux/mroute6.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/if_arp.h> #include <linux/if_arp.h>
#include <linux/proc_fs.h> #include <linux/proc_fs.h>
...@@ -2106,7 +2107,7 @@ static inline size_t rt6_nlmsg_size(void) ...@@ -2106,7 +2107,7 @@ static inline size_t rt6_nlmsg_size(void)
static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
struct in6_addr *dst, struct in6_addr *src, struct in6_addr *dst, struct in6_addr *src,
int iif, int type, u32 pid, u32 seq, int iif, int type, u32 pid, u32 seq,
int prefix, unsigned int flags) int prefix, int nowait, unsigned int flags)
{ {
struct rtmsg *rtm; struct rtmsg *rtm;
struct nlmsghdr *nlh; struct nlmsghdr *nlh;
...@@ -2166,9 +2167,24 @@ static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, ...@@ -2166,9 +2167,24 @@ static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
} else if (rtm->rtm_src_len) } else if (rtm->rtm_src_len)
NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
#endif #endif
if (iif) if (iif) {
NLA_PUT_U32(skb, RTA_IIF, iif); #ifdef CONFIG_IPV6_MROUTE
else if (dst) { if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
int err = ip6mr_get_route(skb, rtm, nowait);
if (err <= 0) {
if (!nowait) {
if (err == 0)
return 0;
goto nla_put_failure;
} else {
if (err == -EMSGSIZE)
goto nla_put_failure;
}
}
} else
#endif
NLA_PUT_U32(skb, RTA_IIF, iif);
} else if (dst) {
struct in6_addr saddr_buf; struct in6_addr saddr_buf;
if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev, if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev,
dst, 0, &saddr_buf) == 0) dst, 0, &saddr_buf) == 0)
...@@ -2211,7 +2227,7 @@ int rt6_dump_route(struct rt6_info *rt, void *p_arg) ...@@ -2211,7 +2227,7 @@ int rt6_dump_route(struct rt6_info *rt, void *p_arg)
return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
prefix, NLM_F_MULTI); prefix, 0, NLM_F_MULTI);
} }
static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
...@@ -2277,7 +2293,7 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void ...@@ -2277,7 +2293,7 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void
err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
RTM_NEWROUTE, NETLINK_CB(in_skb).pid, RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
nlh->nlmsg_seq, 0, 0); nlh->nlmsg_seq, 0, 0, 0);
if (err < 0) { if (err < 0) {
kfree_skb(skb); kfree_skb(skb);
goto errout; goto errout;
...@@ -2303,7 +2319,7 @@ void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) ...@@ -2303,7 +2319,7 @@ void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
goto errout; goto errout;
err = rt6_fill_node(skb, rt, NULL, NULL, 0, err = rt6_fill_node(skb, rt, NULL, NULL, 0,
event, info->pid, seq, 0, 0); event, info->pid, seq, 0, 0, 0);
if (err < 0) { if (err < 0) {
/* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
WARN_ON(err == -EMSGSIZE); WARN_ON(err == -EMSGSIZE);
......
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