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Commit 349f29d8 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
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econet: remove ancient bug ridden protocol 

More spring cleaning!

The ancient Econet protocol should go. Most of the bug fixes in recent
years have been fixing security vulnerabilities. The hardware hasn't
been made since the 90s, it is only interesting as an archeological curiosity.

For the truly curious, or insomniac, go read up on it.
  http://en.wikipedia.org/wiki/EconetSigned-off-by: default avatarStephen Hemminger <shemminger@vyatta.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 09dcd604
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include/linux/Kbuild
View file @ 349f29d8
......@@ -167,7 +167,6 @@ header-y += if_arp.h
header-y += if_bonding.h
header-y += if_bridge.h
header-y += if_cablemodem.h
header-y += if_ec.h
header-y += if_eql.h
header-y += if_ether.h
header-y += if_fc.h
......
include/linux/if_ec.h deleted 100644 → 0
View file @ 09dcd604
/* Definitions for Econet sockets. */
#ifndef __LINUX_IF_EC
#define __LINUX_IF_EC
/* User visible stuff. Glibc provides its own but libc5 folk will use these */
struct ec_addr {
unsigned char station; /* Station number. */
unsigned char net; /* Network number. */
};
struct sockaddr_ec {
unsigned short sec_family;
unsigned char port; /* Port number. */
unsigned char cb; /* Control/flag byte. */
unsigned char type; /* Type of message. */
struct ec_addr addr;
unsigned long cookie;
};
#define ECTYPE_PACKET_RECEIVED 0 /* Packet received */
#define ECTYPE_TRANSMIT_STATUS 0x10 /* Transmit completed,
low nibble holds status */
#define ECTYPE_TRANSMIT_OK 1
#define ECTYPE_TRANSMIT_NOT_LISTENING 2
#define ECTYPE_TRANSMIT_NET_ERROR 3
#define ECTYPE_TRANSMIT_NO_CLOCK 4
#define ECTYPE_TRANSMIT_LINE_JAMMED 5
#define ECTYPE_TRANSMIT_NOT_PRESENT 6
#ifdef __KERNEL__
#define EC_HLEN 6
/* This is what an Econet frame looks like on the wire. */
struct ec_framehdr {
unsigned char dst_stn;
unsigned char dst_net;
unsigned char src_stn;
unsigned char src_net;
unsigned char cb;
unsigned char port;
};
struct econet_sock {
/* struct sock has to be the first member of econet_sock */
struct sock sk;
unsigned char cb;
unsigned char port;
unsigned char station;
unsigned char net;
unsigned short num;
};
static inline struct econet_sock *ec_sk(const struct sock *sk)
{
return (struct econet_sock *)sk;
}
struct ec_device {
unsigned char station, net; /* Econet protocol address */
};
#endif
#endif
net/Kconfig
View file @ 349f29d8
......@@ -207,7 +207,6 @@ source "net/ipx/Kconfig"
source "drivers/net/appletalk/Kconfig"
source "net/x25/Kconfig"
source "net/lapb/Kconfig"
source "net/econet/Kconfig"
source "net/wanrouter/Kconfig"
source "net/phonet/Kconfig"
source "net/ieee802154/Kconfig"
......
net/Makefile
View file @ 349f29d8
......@@ -40,7 +40,6 @@ obj-$(CONFIG_AF_RXRPC) += rxrpc/
obj-$(CONFIG_ATM) += atm/
obj-$(CONFIG_L2TP) += l2tp/
obj-$(CONFIG_DECNET) += decnet/
obj-$(CONFIG_ECONET) += econet/
obj-$(CONFIG_PHONET) += phonet/
ifneq ($(CONFIG_VLAN_8021Q),)
obj-y += 8021q/
......
net/econet/Kconfig deleted 100644 → 0
View file @ 09dcd604
#
# Acorn Econet/AUN protocols
#
config ECONET
tristate "Acorn Econet/AUN protocols (EXPERIMENTAL)"
depends on EXPERIMENTAL && INET
---help---
Econet is a fairly old and slow networking protocol mainly used by
Acorn computers to access file and print servers. It uses native
Econet network cards. AUN is an implementation of the higher level
parts of Econet that runs over ordinary Ethernet connections, on
top of the UDP packet protocol, which in turn runs on top of the
Internet protocol IP.
If you say Y here, you can choose with the next two options whether
to send Econet/AUN traffic over a UDP Ethernet connection or over
a native Econet network card.
To compile this driver as a module, choose M here: the module
will be called econet.
config ECONET_AUNUDP
bool "AUN over UDP"
depends on ECONET
help
Say Y here if you want to send Econet/AUN traffic over a UDP
connection (UDP is a packet based protocol that runs on top of the
Internet protocol IP) using an ordinary Ethernet network card.
config ECONET_NATIVE
bool "Native Econet"
depends on ECONET
help
Say Y here if you have a native Econet network card installed in
your computer.
net/econet/Makefile deleted 100644 → 0
View file @ 09dcd604
#
# Makefile for Econet support code.
#
obj-$(CONFIG_ECONET) += econet.o
econet-y := af_econet.o
net/econet/af_econet.c deleted 100644 → 0
View file @ 09dcd604
/*
* An implementation of the Acorn Econet and AUN protocols.
* Philip Blundell <philb@gnu.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.
*
*/
#define pr_fmt(fmt) fmt
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/route.h>
#include <linux/inet.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/skbuff.h>
#include <linux/udp.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <net/sock.h>
#include <net/inet_common.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/if_ec.h>
#include <net/udp.h>
#include <net/ip.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
static const struct proto_ops econet_ops;
static struct hlist_head econet_sklist;
static DEFINE_SPINLOCK(econet_lock);
static DEFINE_MUTEX(econet_mutex);
/* Since there are only 256 possible network numbers (or fewer, depends
how you count) it makes sense to use a simple lookup table. */
static struct net_device *net2dev_map[256];
#define EC_PORT_IP 0xd2
#ifdef CONFIG_ECONET_AUNUDP
static DEFINE_SPINLOCK(aun_queue_lock);
static struct socket *udpsock;
#define AUN_PORT 0x8000
struct aunhdr {
unsigned char code; /* AUN magic protocol byte */
unsigned char port;
unsigned char cb;
unsigned char pad;
unsigned long handle;
};
static unsigned long aun_seq;
/* Queue of packets waiting to be transmitted. */
static struct sk_buff_head aun_queue;
static struct timer_list ab_cleanup_timer;
#endif /* CONFIG_ECONET_AUNUDP */
/* Per-packet information */
struct ec_cb {
struct sockaddr_ec sec;
unsigned long cookie; /* Supplied by user. */
#ifdef CONFIG_ECONET_AUNUDP
int done;
unsigned long seq; /* Sequencing */
unsigned long timeout; /* Timeout */
unsigned long start; /* jiffies */
#endif
#ifdef CONFIG_ECONET_NATIVE
void (*sent)(struct sk_buff *, int result);
#endif
};
static void econet_remove_socket(struct hlist_head *list, struct sock *sk)
{
spin_lock_bh(&econet_lock);
sk_del_node_init(sk);
spin_unlock_bh(&econet_lock);
}
static void econet_insert_socket(struct hlist_head *list, struct sock *sk)
{
spin_lock_bh(&econet_lock);
sk_add_node(sk, list);
spin_unlock_bh(&econet_lock);
}
/*
* Pull a packet from our receive queue and hand it to the user.
* If necessary we block.
*/
static int econet_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t len, int flags)
{
struct sock *sk = sock->sk;
struct sk_buff *skb;
size_t copied;
int err;
msg->msg_namelen = sizeof(struct sockaddr_ec);
mutex_lock(&econet_mutex);
/*
* Call the generic datagram receiver. This handles all sorts
* of horrible races and re-entrancy so we can forget about it
* in the protocol layers.
*
* Now it will return ENETDOWN, if device have just gone down,
* but then it will block.
*/
skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
/*
* An error occurred so return it. Because skb_recv_datagram()
* handles the blocking we don't see and worry about blocking
* retries.
*/
if (skb == NULL)
goto out;
/*
* You lose any data beyond the buffer you gave. If it worries a
* user program they can ask the device for its MTU anyway.
*/
copied = skb->len;
if (copied > len) {
copied = len;
msg->msg_flags |= MSG_TRUNC;
}
/* We can't use skb_copy_datagram here */
err = memcpy_toiovec(msg->msg_iov, skb->data, copied);
if (err)
goto out_free;
sk->sk_stamp = skb->tstamp;
if (msg->msg_name)
memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
/*
* Free or return the buffer as appropriate. Again this
* hides all the races and re-entrancy issues from us.
*/
err = copied;
out_free:
skb_free_datagram(sk, skb);
out:
mutex_unlock(&econet_mutex);
return err;
}
/*
* Bind an Econet socket.
*/
static int econet_bind(struct socket *sock, struct sockaddr *uaddr,
int addr_len)
{
struct sockaddr_ec *sec = (struct sockaddr_ec *)uaddr;
struct sock *sk;
struct econet_sock *eo;
/*
* Check legality
*/
if (addr_len < sizeof(struct sockaddr_ec) ||
sec->sec_family != AF_ECONET)
return -EINVAL;
mutex_lock(&econet_mutex);
sk = sock->sk;
eo = ec_sk(sk);
eo->cb = sec->cb;
eo->port = sec->port;
eo->station = sec->addr.station;
eo->net = sec->addr.net;
mutex_unlock(&econet_mutex);
return 0;
}
#if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE)
/*
* Queue a transmit result for the user to be told about.
*/
static void tx_result(struct sock *sk, unsigned long cookie, int result)
{
struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
struct ec_cb *eb;
struct sockaddr_ec *sec;
if (skb == NULL) {
pr_debug("econet: memory squeeze, transmit result dropped\n");
return;
}
eb = (struct ec_cb *)&skb->cb;
sec = (struct sockaddr_ec *)&eb->sec;
memset(sec, 0, sizeof(struct sockaddr_ec));
sec->cookie = cookie;
sec->type = ECTYPE_TRANSMIT_STATUS | result;
sec->sec_family = AF_ECONET;
if (sock_queue_rcv_skb(sk, skb) < 0)
kfree_skb(skb);
}
#endif
#ifdef CONFIG_ECONET_NATIVE
/*
* Called by the Econet hardware driver when a packet transmit
* has completed. Tell the user.
*/
static void ec_tx_done(struct sk_buff *skb, int result)
{
struct ec_cb *eb = (struct ec_cb *)&skb->cb;
tx_result(skb->sk, eb->cookie, result);
}
#endif
/*
* Send a packet. We have to work out which device it's going out on
* and hence whether to use real Econet or the UDP emulation.
*/
static int econet_sendmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t len)
{
struct sockaddr_ec *saddr = (struct sockaddr_ec *)msg->msg_name;
struct net_device *dev;
struct ec_addr addr;
int err;
unsigned char port, cb;
#if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE)
struct sock *sk = sock->sk;
struct sk_buff *skb;
struct ec_cb *eb;
#endif
#ifdef CONFIG_ECONET_AUNUDP
struct msghdr udpmsg;
struct iovec iov[2];
struct aunhdr ah;
struct sockaddr_in udpdest;
__kernel_size_t size;
mm_segment_t oldfs;
char *userbuf;
#endif
/*
* Check the flags.
*/
if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
return -EINVAL;
/*
* Get and verify the address.
*/
mutex_lock(&econet_mutex);
if (saddr == NULL || msg->msg_namelen < sizeof(struct sockaddr_ec)) {
mutex_unlock(&econet_mutex);
return -EINVAL;
}
addr.station = saddr->addr.station;
addr.net = saddr->addr.net;
port = saddr->port;
cb = saddr->cb;
/* Look for a device with the right network number. */
dev = net2dev_map[addr.net];
/* If not directly reachable, use some default */
if (dev == NULL) {
dev = net2dev_map[0];
/* No interfaces at all? */
if (dev == NULL) {
mutex_unlock(&econet_mutex);
return -ENETDOWN;
}
}
if (dev->type == ARPHRD_ECONET) {
/* Real hardware Econet. We're not worthy etc. */
#ifdef CONFIG_ECONET_NATIVE
unsigned short proto = 0;
int hlen, tlen;
int res;
if (len + 15 > dev->mtu) {
mutex_unlock(&econet_mutex);
return -EMSGSIZE;
}
dev_hold(dev);
hlen = LL_RESERVED_SPACE(dev);
tlen = dev->needed_tailroom;
skb = sock_alloc_send_skb(sk, len + hlen + tlen,
msg->msg_flags & MSG_DONTWAIT, &err);
if (skb == NULL)
goto out_unlock;
skb_reserve(skb, hlen);
skb_reset_network_header(skb);
eb = (struct ec_cb *)&skb->cb;
eb->cookie = saddr->cookie;
eb->sec = *saddr;
eb->sent = ec_tx_done;
err = -EINVAL;
res = dev_hard_header(skb, dev, ntohs(proto), &addr, NULL, len);
if (res < 0)
goto out_free;
if (res > 0) {
struct ec_framehdr *fh;
/* Poke in our control byte and
port number. Hack, hack. */
fh = (struct ec_framehdr *)skb->data;
fh->cb = cb;
fh->port = port;
if (sock->type != SOCK_DGRAM) {
skb_reset_tail_pointer(skb);
skb->len = 0;
}
}
/* Copy the data. Returns -EFAULT on error */
err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
skb->protocol = proto;
skb->dev = dev;
skb->priority = sk->sk_priority;
if (err)
goto out_free;
err = -ENETDOWN;
if (!(dev->flags & IFF_UP))
goto out_free;
/*
* Now send it
*/
dev_queue_xmit(skb);
dev_put(dev);
mutex_unlock(&econet_mutex);
return len;
out_free:
kfree_skb(skb);
out_unlock:
if (dev)
dev_put(dev);
#else
err = -EPROTOTYPE;
#endif
mutex_unlock(&econet_mutex);
return err;
}
#ifdef CONFIG_ECONET_AUNUDP
/* AUN virtual Econet. */
if (udpsock == NULL) {
mutex_unlock(&econet_mutex);
return -ENETDOWN; /* No socket - can't send */
}
if (len > 32768) {
err = -E2BIG;
goto error;
}
/* Make up a UDP datagram and hand it off to some higher intellect. */
memset(&udpdest, 0, sizeof(udpdest));
udpdest.sin_family = AF_INET;
udpdest.sin_port = htons(AUN_PORT);
/* At the moment we use the stupid Acorn scheme of Econet address
y.x maps to IP a.b.c.x. This should be replaced with something
more flexible and more aware of subnet masks. */
{
struct in_device *idev;
unsigned long network = 0;
rcu_read_lock();
idev = __in_dev_get_rcu(dev);
if (idev) {
if (idev->ifa_list)
network = ntohl(idev->ifa_list->ifa_address) &
0xffffff00; /* !!! */
}
rcu_read_unlock();
udpdest.sin_addr.s_addr = htonl(network | addr.station);
}
memset(&ah, 0, sizeof(ah));
ah.port = port;
ah.cb = cb & 0x7f;
ah.code = 2; /* magic */
/* tack our header on the front of the iovec */
size = sizeof(struct aunhdr);
iov[0].iov_base = (void *)&ah;
iov[0].iov_len = size;
userbuf = vmalloc(len);
if (userbuf == NULL) {
err = -ENOMEM;
goto error;
}
iov[1].iov_base = userbuf;
iov[1].iov_len = len;
err = memcpy_fromiovec(userbuf, msg->msg_iov, len);
if (err)
goto error_free_buf;
/* Get a skbuff (no data, just holds our cb information) */
skb = sock_alloc_send_skb(sk, 0, msg->msg_flags & MSG_DONTWAIT, &err);
if (skb == NULL)
goto error_free_buf;
eb = (struct ec_cb *)&skb->cb;
eb->cookie = saddr->cookie;
eb->timeout = 5 * HZ;
eb->start = jiffies;
ah.handle = aun_seq;
eb->seq = (aun_seq++);
eb->sec = *saddr;
skb_queue_tail(&aun_queue, skb);
udpmsg.msg_name = (void *)&udpdest;
udpmsg.msg_namelen = sizeof(udpdest);
udpmsg.msg_iov = &iov[0];
udpmsg.msg_iovlen = 2;
udpmsg.msg_control = NULL;
udpmsg.msg_controllen = 0;
udpmsg.msg_flags = 0;
oldfs = get_fs();
set_fs(KERNEL_DS); /* More privs :-) */
err = sock_sendmsg(udpsock, &udpmsg, size);
set_fs(oldfs);
error_free_buf:
vfree(userbuf);
error:
#else
err = -EPROTOTYPE;
#endif
mutex_unlock(&econet_mutex);
return err;
}
/*
* Look up the address of a socket.
*/
static int econet_getname(struct socket *sock, struct sockaddr *uaddr,
int *uaddr_len, int peer)
{
struct sock *sk;
struct econet_sock *eo;
struct sockaddr_ec *sec = (struct sockaddr_ec *)uaddr;
if (peer)
return -EOPNOTSUPP;
memset(sec, 0, sizeof(*sec));
mutex_lock(&econet_mutex);
sk = sock->sk;
eo = ec_sk(sk);
sec->sec_family = AF_ECONET;
sec->port = eo->port;
sec->addr.station = eo->station;
sec->addr.net = eo->net;
mutex_unlock(&econet_mutex);
*uaddr_len = sizeof(*sec);
return 0;
}
static void econet_destroy_timer(unsigned long data)
{
struct sock *sk = (struct sock *)data;
if (!sk_has_allocations(sk)) {
sk_free(sk);
return;
}
sk->sk_timer.expires = jiffies + 10 * HZ;
add_timer(&sk->sk_timer);
pr_debug("econet: socket destroy delayed\n");
}
/*
* Close an econet socket.
*/
static int econet_release(struct socket *sock)
{
struct sock *sk;
mutex_lock(&econet_mutex);
sk = sock->sk;
if (!sk)
goto out_unlock;
econet_remove_socket(&econet_sklist, sk);
/*
* Now the socket is dead. No more input will appear.
*/
sk->sk_state_change(sk); /* It is useless. Just for sanity. */
sock_orphan(sk);
/* Purge queues */
skb_queue_purge(&sk->sk_receive_queue);
if (sk_has_allocations(sk)) {
sk->sk_timer.data = (unsigned long)sk;
sk->sk_timer.expires = jiffies + HZ;
sk->sk_timer.function = econet_destroy_timer;
add_timer(&sk->sk_timer);
goto out_unlock;
}
sk_free(sk);
out_unlock:
mutex_unlock(&econet_mutex);
return 0;
}
static struct proto econet_proto = {
.name = "ECONET",
.owner = THIS_MODULE,
.obj_size = sizeof(struct econet_sock),
};
/*
* Create an Econet socket
*/
static int econet_create(struct net *net, struct socket *sock, int protocol,
int kern)
{
struct sock *sk;
struct econet_sock *eo;
int err;
if (!net_eq(net, &init_net))
return -EAFNOSUPPORT;
/* Econet only provides datagram services. */
if (sock->type != SOCK_DGRAM)
return -ESOCKTNOSUPPORT;
sock->state = SS_UNCONNECTED;
err = -ENOBUFS;
sk = sk_alloc(net, PF_ECONET, GFP_KERNEL, &econet_proto);
if (sk == NULL)
goto out;
sk->sk_reuse = SK_CAN_REUSE;
sock->ops = &econet_ops;
sock_init_data(sock, sk);
eo = ec_sk(sk);
sock_reset_flag(sk, SOCK_ZAPPED);
sk->sk_family = PF_ECONET;
eo->num = protocol;
econet_insert_socket(&econet_sklist, sk);
return 0;
out:
return err;
}
/*
* Handle Econet specific ioctls
*/
static int ec_dev_ioctl(struct socket *sock, unsigned int cmd, void __user *arg)
{
struct ifreq ifr;
struct ec_device *edev;
struct net_device *dev;
struct sockaddr_ec *sec;
int err;
/*
* Fetch the caller's info block into kernel space
*/
if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
return -EFAULT;
dev = dev_get_by_name(&init_net, ifr.ifr_name);
if (dev == NULL)
return -ENODEV;
sec = (struct sockaddr_ec *)&ifr.ifr_addr;
mutex_lock(&econet_mutex);
err = 0;
switch (cmd) {
case SIOCSIFADDR:
if (!capable(CAP_NET_ADMIN)) {
err = -EPERM;
break;
}
edev = dev->ec_ptr;
if (edev == NULL) {
/* Magic up a new one. */
edev = kzalloc(sizeof(struct ec_device), GFP_KERNEL);
if (edev == NULL) {
err = -ENOMEM;
break;
}
dev->ec_ptr = edev;
} else
net2dev_map[edev->net] = NULL;
edev->station = sec->addr.station;
edev->net = sec->addr.net;
net2dev_map[sec->addr.net] = dev;
if (!net2dev_map[0])
net2dev_map[0] = dev;
break;
case SIOCGIFADDR:
edev = dev->ec_ptr;
if (edev == NULL) {
err = -ENODEV;
break;
}
memset(sec, 0, sizeof(struct sockaddr_ec));
sec->addr.station = edev->station;
sec->addr.net = edev->net;
sec->sec_family = AF_ECONET;
dev_put(dev);
if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
err = -EFAULT;
break;
default:
err = -EINVAL;
break;
}
mutex_unlock(&econet_mutex);
dev_put(dev);
return err;
}
/*
* Handle generic ioctls
*/
static int econet_ioctl(struct socket *sock, unsigned int cmd,
unsigned long arg)
{
struct sock *sk = sock->sk;
void __user *argp = (void __user *)arg;
switch (cmd) {
case SIOCGSTAMP:
return sock_get_timestamp(sk, argp);
case SIOCGSTAMPNS:
return sock_get_timestampns(sk, argp);
case SIOCSIFADDR:
case SIOCGIFADDR:
return ec_dev_ioctl(sock, cmd, argp);
}
return -ENOIOCTLCMD;
}
static const struct net_proto_family econet_family_ops = {
.family = PF_ECONET,
.create = econet_create,
.owner = THIS_MODULE,
};
static const struct proto_ops econet_ops = {
.family = PF_ECONET,
.owner = THIS_MODULE,
.release = econet_release,
.bind = econet_bind,
.connect = sock_no_connect,
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.getname = econet_getname,
.poll = datagram_poll,
.ioctl = econet_ioctl,
.listen = sock_no_listen,
.shutdown = sock_no_shutdown,
.setsockopt = sock_no_setsockopt,
.getsockopt = sock_no_getsockopt,
.sendmsg = econet_sendmsg,
.recvmsg = econet_recvmsg,
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
};
#if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE)
/*
* Find the listening socket, if any, for the given data.
*/
static struct sock *ec_listening_socket(unsigned char port, unsigned char
station, unsigned char net)
{
struct sock *sk;
struct hlist_node *node;
spin_lock(&econet_lock);
sk_for_each(sk, node, &econet_sklist) {
struct econet_sock *opt = ec_sk(sk);
if ((opt->port == port || opt->port == 0) &&
(opt->station == station || opt->station == 0) &&
(opt->net == net || opt->net == 0)) {
sock_hold(sk);
goto found;
}
}
sk = NULL;
found:
spin_unlock(&econet_lock);
return sk;
}
/*
* Queue a received packet for a socket.
*/
static int ec_queue_packet(struct sock *sk, struct sk_buff *skb,
unsigned char stn, unsigned char net,
unsigned char cb, unsigned char port)
{
struct ec_cb *eb = (struct ec_cb *)&skb->cb;
struct sockaddr_ec *sec = (struct sockaddr_ec *)&eb->sec;
memset(sec, 0, sizeof(struct sockaddr_ec));
sec->sec_family = AF_ECONET;
sec->type = ECTYPE_PACKET_RECEIVED;
sec->port = port;
sec->cb = cb;
sec->addr.net = net;
sec->addr.station = stn;
return sock_queue_rcv_skb(sk, skb);
}
#endif
#ifdef CONFIG_ECONET_AUNUDP
/*
* Send an AUN protocol response.
*/
static void aun_send_response(__u32 addr, unsigned long seq, int code, int cb)
{
struct sockaddr_in sin = {
.sin_family = AF_INET,
.sin_port = htons(AUN_PORT),
.sin_addr = {.s_addr = addr}
};
struct aunhdr ah = {.code = code, .cb = cb, .handle = seq};
struct kvec iov = {.iov_base = (void *)&ah, .iov_len = sizeof(ah)};
struct msghdr udpmsg;
udpmsg.msg_name = (void *)&sin;
udpmsg.msg_namelen = sizeof(sin);
udpmsg.msg_control = NULL;
udpmsg.msg_controllen = 0;
udpmsg.msg_flags = 0;
kernel_sendmsg(udpsock, &udpmsg, &iov, 1, sizeof(ah));
}
/*
* Handle incoming AUN packets. Work out if anybody wants them,
* and send positive or negative acknowledgements as appropriate.
*/
static void aun_incoming(struct sk_buff *skb, struct aunhdr *ah, size_t len)
{
struct iphdr *ip = ip_hdr(skb);
unsigned char stn = ntohl(ip->saddr) & 0xff;
struct dst_entry *dst = skb_dst(skb);
struct ec_device *edev = NULL;
struct sock *sk = NULL;
struct sk_buff *newskb;
if (dst)
edev = dst->dev->ec_ptr;
if (!edev)
goto bad;
sk = ec_listening_socket(ah->port, stn, edev->net);
if (sk == NULL)
goto bad; /* Nobody wants it */
newskb = alloc_skb((len - sizeof(struct aunhdr) + 15) & ~15,
GFP_ATOMIC);
if (newskb == NULL) {
pr_debug("AUN: memory squeeze, dropping packet\n");
/* Send nack and hope sender tries again */
goto bad;
}
memcpy(skb_put(newskb, len - sizeof(struct aunhdr)), (void *)(ah + 1),
len - sizeof(struct aunhdr));
if (ec_queue_packet(sk, newskb, stn, edev->net, ah->cb, ah->port)) {
/* Socket is bankrupt. */
kfree_skb(newskb);
goto bad;
}
aun_send_response(ip->saddr, ah->handle, 3, 0);
sock_put(sk);
return;
bad:
aun_send_response(ip->saddr, ah->handle, 4, 0);
if (sk)
sock_put(sk);
}
/*
* Handle incoming AUN transmit acknowledgements. If the sequence
* number matches something in our backlog then kill it and tell
* the user. If the remote took too long to reply then we may have
* dropped the packet already.
*/
static void aun_tx_ack(unsigned long seq, int result)
{
struct sk_buff *skb;
unsigned long flags;
struct ec_cb *eb;
spin_lock_irqsave(&aun_queue_lock, flags);
skb_queue_walk(&aun_queue, skb) {
eb = (struct ec_cb *)&skb->cb;
if (eb->seq == seq)
goto foundit;
}
spin_unlock_irqrestore(&aun_queue_lock, flags);
pr_debug("AUN: unknown sequence %ld\n", seq);
return;
foundit:
tx_result(skb->sk, eb->cookie, result);
skb_unlink(skb, &aun_queue);
spin_unlock_irqrestore(&aun_queue_lock, flags);
kfree_skb(skb);
}
/*
* Deal with received AUN frames - sort out what type of thing it is
* and hand it to the right function.
*/
static void aun_data_available(struct sock *sk, int slen)
{
int err;
struct sk_buff *skb;
unsigned char *data;
struct aunhdr *ah;
size_t len;
while ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) {
if (err == -EAGAIN) {
pr_err("AUN: no data available?!\n");
return;
}
pr_debug("AUN: recvfrom() error %d\n", -err);
}
data = skb_transport_header(skb) + sizeof(struct udphdr);
ah = (struct aunhdr *)data;
len = skb->len - sizeof(struct udphdr);
switch (ah->code) {
case 2:
aun_incoming(skb, ah, len);
break;
case 3:
aun_tx_ack(ah->handle, ECTYPE_TRANSMIT_OK);
break;
case 4:
aun_tx_ack(ah->handle, ECTYPE_TRANSMIT_NOT_LISTENING);
break;
default:
pr_debug("AUN: unknown packet type: %d\n", data[0]);
}
skb_free_datagram(sk, skb);
}
/*
* Called by the timer to manage the AUN transmit queue. If a packet
* was sent to a dead or nonexistent host then we will never get an
* acknowledgement back. After a few seconds we need to spot this and
* drop the packet.
*/
static void ab_cleanup(unsigned long h)
{
struct sk_buff *skb, *n;
unsigned long flags;
spin_lock_irqsave(&aun_queue_lock, flags);
skb_queue_walk_safe(&aun_queue, skb, n) {
struct ec_cb *eb = (struct ec_cb *)&skb->cb;
if ((jiffies - eb->start) > eb->timeout) {
tx_result(skb->sk, eb->cookie,
ECTYPE_TRANSMIT_NOT_PRESENT);
skb_unlink(skb, &aun_queue);
kfree_skb(skb);
}
}
spin_unlock_irqrestore(&aun_queue_lock, flags);
mod_timer(&ab_cleanup_timer, jiffies + (HZ * 2));
}
static int __init aun_udp_initialise(void)
{
int error;
struct sockaddr_in sin;
skb_queue_head_init(&aun_queue);
setup_timer(&ab_cleanup_timer, ab_cleanup, 0);
ab_cleanup_timer.expires = jiffies + (HZ * 2);
add_timer(&ab_cleanup_timer);
memset(&sin, 0, sizeof(sin));
sin.sin_port = htons(AUN_PORT);
/* We can count ourselves lucky Acorn machines are too dim to
speak IPv6. :-) */
error = sock_create_kern(PF_INET, SOCK_DGRAM, 0, &udpsock);
if (error < 0) {
pr_err("AUN: socket error %d\n", -error);
return error;
}
udpsock->sk->sk_reuse = SK_CAN_REUSE;
udpsock->sk->sk_allocation = GFP_ATOMIC; /* we're going to call it
from interrupts */
error = udpsock->ops->bind(udpsock, (struct sockaddr *)&sin,
sizeof(sin));
if (error < 0) {
pr_err("AUN: bind error %d\n", -error);
goto release;
}
udpsock->sk->sk_data_ready = aun_data_available;
return 0;
release:
sock_release(udpsock);
udpsock = NULL;
return error;
}
#endif
#ifdef CONFIG_ECONET_NATIVE
/*
* Receive an Econet frame from a device.
*/
static int econet_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
struct ec_framehdr *hdr;
struct sock *sk = NULL;
struct ec_device *edev = dev->ec_ptr;
if (!net_eq(dev_net(dev), &init_net))
goto drop;
if (skb->pkt_type == PACKET_OTHERHOST)
goto drop;
if (!edev)
goto drop;
skb = skb_share_check(skb, GFP_ATOMIC);
if (skb == NULL)
return NET_RX_DROP;
if (!pskb_may_pull(skb, sizeof(struct ec_framehdr)))
goto drop;
hdr = (struct ec_framehdr *)skb->data;
/* First check for encapsulated IP */
if (hdr->port == EC_PORT_IP) {
skb->protocol = htons(ETH_P_IP);
skb_pull(skb, sizeof(struct ec_framehdr));
netif_rx(skb);
return NET_RX_SUCCESS;
}
sk = ec_listening_socket(hdr->port, hdr->src_stn, hdr->src_net);
if (!sk)
goto drop;
if (ec_queue_packet(sk, skb, edev->net, hdr->src_stn, hdr->cb,
hdr->port))
goto drop;
sock_put(sk);
return NET_RX_SUCCESS;
drop:
if (sk)
sock_put(sk);
kfree_skb(skb);
return NET_RX_DROP;
}
static struct packet_type econet_packet_type __read_mostly = {
.type = cpu_to_be16(ETH_P_ECONET),
.func = econet_rcv,
};
static void econet_hw_initialise(void)
{
dev_add_pack(&econet_packet_type);
}
#endif
static int econet_notifier(struct notifier_block *this, unsigned long msg,
void *data)
{
struct net_device *dev = data;
struct ec_device *edev;
if (!net_eq(dev_net(dev), &init_net))
return NOTIFY_DONE;
switch (msg) {
case NETDEV_UNREGISTER:
/* A device has gone down - kill any data we hold for it. */
edev = dev->ec_ptr;
if (edev) {
if (net2dev_map[0] == dev)
net2dev_map[0] = NULL;
net2dev_map[edev->net] = NULL;
kfree(edev);
dev->ec_ptr = NULL;
}
break;
}
return NOTIFY_DONE;
}
static struct notifier_block econet_netdev_notifier = {
.notifier_call = econet_notifier,
};
static void __exit econet_proto_exit(void)
{
#ifdef CONFIG_ECONET_AUNUDP
del_timer(&ab_cleanup_timer);
if (udpsock)
sock_release(udpsock);
#endif
unregister_netdevice_notifier(&econet_netdev_notifier);
#ifdef CONFIG_ECONET_NATIVE
dev_remove_pack(&econet_packet_type);
#endif
sock_unregister(econet_family_ops.family);
proto_unregister(&econet_proto);
}
static int __init econet_proto_init(void)
{
int err = proto_register(&econet_proto, 0);
if (err != 0)
goto out;
sock_register(&econet_family_ops);
#ifdef CONFIG_ECONET_AUNUDP
aun_udp_initialise();
#endif
#ifdef CONFIG_ECONET_NATIVE
econet_hw_initialise();
#endif
register_netdevice_notifier(&econet_netdev_notifier);
out:
return err;
}
module_init(econet_proto_init);
module_exit(econet_proto_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_ECONET);
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