1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
5 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
6 * Copyright (C) Darryl Miles G7LED (dlm@g7led.demon.co.uk)
7 * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
8 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
9 * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
10 * Copyright (C) Hans Alblas PE1AYX (hans@esrac.ele.tue.nl)
11 * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
13 #include <linux/capability.h>
14 #include <linux/module.h>
15 #include <linux/errno.h>
16 #include <linux/types.h>
17 #include <linux/socket.h>
19 #include <linux/kernel.h>
20 #include <linux/sched/signal.h>
21 #include <linux/timer.h>
22 #include <linux/string.h>
23 #include <linux/sockios.h>
24 #include <linux/net.h>
25 #include <linux/slab.h>
27 #include <linux/inet.h>
28 #include <linux/netdevice.h>
29 #include <linux/if_arp.h>
30 #include <linux/skbuff.h>
32 #include <linux/uaccess.h>
33 #include <linux/fcntl.h>
34 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
36 #include <linux/interrupt.h>
37 #include <linux/notifier.h>
38 #include <linux/proc_fs.h>
39 #include <linux/stat.h>
40 #include <linux/sysctl.h>
41 #include <linux/init.h>
42 #include <linux/spinlock.h>
43 #include <net/net_namespace.h>
44 #include <net/tcp_states.h>
50 HLIST_HEAD(ax25_list);
51 DEFINE_SPINLOCK(ax25_list_lock);
53 static const struct proto_ops ax25_proto_ops;
55 static void ax25_free_sock(struct sock *sk)
57 ax25_cb_put(sk_to_ax25(sk));
61 * Socket removal during an interrupt is now safe.
63 static void ax25_cb_del(ax25_cb *ax25)
65 if (!hlist_unhashed(&ax25->ax25_node)) {
66 spin_lock_bh(&ax25_list_lock);
67 hlist_del_init(&ax25->ax25_node);
68 spin_unlock_bh(&ax25_list_lock);
74 * Kill all bound sockets on a dropped device.
76 static void ax25_kill_by_device(struct net_device *dev)
81 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
84 spin_lock_bh(&ax25_list_lock);
86 ax25_for_each(s, &ax25_list) {
87 if (s->ax25_dev == ax25_dev) {
89 spin_unlock_bh(&ax25_list_lock);
90 ax25_disconnect(s, ENETUNREACH);
91 spin_lock_bh(&ax25_list_lock);
93 /* The entry could have been deleted from the
94 * list meanwhile and thus the next pointer is
95 * no longer valid. Play it safe and restart
96 * the scan. Forward progress is ensured
97 * because we set s->ax25_dev to NULL and we
98 * are never passed a NULL 'dev' argument.
103 spin_unlock_bh(&ax25_list_lock);
107 * Handle device status changes.
109 static int ax25_device_event(struct notifier_block *this, unsigned long event,
112 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
114 if (!net_eq(dev_net(dev), &init_net))
117 /* Reject non AX.25 devices */
118 if (dev->type != ARPHRD_AX25)
123 ax25_dev_device_up(dev);
126 ax25_kill_by_device(dev);
127 ax25_rt_device_down(dev);
128 ax25_dev_device_down(dev);
138 * Add a socket to the bound sockets list.
140 void ax25_cb_add(ax25_cb *ax25)
142 spin_lock_bh(&ax25_list_lock);
144 hlist_add_head(&ax25->ax25_node, &ax25_list);
145 spin_unlock_bh(&ax25_list_lock);
149 * Find a socket that wants to accept the SABM we have just
152 struct sock *ax25_find_listener(ax25_address *addr, int digi,
153 struct net_device *dev, int type)
157 spin_lock(&ax25_list_lock);
158 ax25_for_each(s, &ax25_list) {
159 if ((s->iamdigi && !digi) || (!s->iamdigi && digi))
161 if (s->sk && !ax25cmp(&s->source_addr, addr) &&
162 s->sk->sk_type == type && s->sk->sk_state == TCP_LISTEN) {
163 /* If device is null we match any device */
164 if (s->ax25_dev == NULL || s->ax25_dev->dev == dev) {
166 spin_unlock(&ax25_list_lock);
171 spin_unlock(&ax25_list_lock);
177 * Find an AX.25 socket given both ends.
179 struct sock *ax25_get_socket(ax25_address *my_addr, ax25_address *dest_addr,
182 struct sock *sk = NULL;
185 spin_lock(&ax25_list_lock);
186 ax25_for_each(s, &ax25_list) {
187 if (s->sk && !ax25cmp(&s->source_addr, my_addr) &&
188 !ax25cmp(&s->dest_addr, dest_addr) &&
189 s->sk->sk_type == type) {
196 spin_unlock(&ax25_list_lock);
202 * Find an AX.25 control block given both ends. It will only pick up
203 * floating AX.25 control blocks or non Raw socket bound control blocks.
205 ax25_cb *ax25_find_cb(ax25_address *src_addr, ax25_address *dest_addr,
206 ax25_digi *digi, struct net_device *dev)
210 spin_lock_bh(&ax25_list_lock);
211 ax25_for_each(s, &ax25_list) {
212 if (s->sk && s->sk->sk_type != SOCK_SEQPACKET)
214 if (s->ax25_dev == NULL)
216 if (ax25cmp(&s->source_addr, src_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->ax25_dev->dev == dev) {
217 if (digi != NULL && digi->ndigi != 0) {
218 if (s->digipeat == NULL)
220 if (ax25digicmp(s->digipeat, digi) != 0)
223 if (s->digipeat != NULL && s->digipeat->ndigi != 0)
227 spin_unlock_bh(&ax25_list_lock);
232 spin_unlock_bh(&ax25_list_lock);
237 EXPORT_SYMBOL(ax25_find_cb);
239 void ax25_send_to_raw(ax25_address *addr, struct sk_buff *skb, int proto)
242 struct sk_buff *copy;
244 spin_lock(&ax25_list_lock);
245 ax25_for_each(s, &ax25_list) {
246 if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 &&
247 s->sk->sk_type == SOCK_RAW &&
248 s->sk->sk_protocol == proto &&
249 s->ax25_dev->dev == skb->dev &&
250 atomic_read(&s->sk->sk_rmem_alloc) <= s->sk->sk_rcvbuf) {
251 if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL)
253 if (sock_queue_rcv_skb(s->sk, copy) != 0)
257 spin_unlock(&ax25_list_lock);
263 void ax25_destroy_socket(ax25_cb *);
266 * Handler for deferred kills.
268 static void ax25_destroy_timer(struct timer_list *t)
270 ax25_cb *ax25 = from_timer(ax25, t, dtimer);
277 ax25_destroy_socket(ax25);
283 * This is called from user mode and the timers. Thus it protects itself
284 * against interrupt users but doesn't worry about being called during
285 * work. Once it is removed from the queue no interrupt or bottom half
286 * will touch it and we are (fairly 8-) ) safe.
288 void ax25_destroy_socket(ax25_cb *ax25)
294 ax25_stop_heartbeat(ax25);
295 ax25_stop_t1timer(ax25);
296 ax25_stop_t2timer(ax25);
297 ax25_stop_t3timer(ax25);
298 ax25_stop_idletimer(ax25);
300 ax25_clear_queues(ax25); /* Flush the queues */
302 if (ax25->sk != NULL) {
303 while ((skb = skb_dequeue(&ax25->sk->sk_receive_queue)) != NULL) {
304 if (skb->sk != ax25->sk) {
305 /* A pending connection */
306 ax25_cb *sax25 = sk_to_ax25(skb->sk);
308 /* Queue the unaccepted socket for death */
309 sock_orphan(skb->sk);
311 /* 9A4GL: hack to release unaccepted sockets */
312 skb->sk->sk_state = TCP_LISTEN;
314 ax25_start_heartbeat(sax25);
315 sax25->state = AX25_STATE_0;
320 skb_queue_purge(&ax25->sk->sk_write_queue);
323 if (ax25->sk != NULL) {
324 if (sk_has_allocations(ax25->sk)) {
325 /* Defer: outstanding buffers */
326 timer_setup(&ax25->dtimer, ax25_destroy_timer, 0);
327 ax25->dtimer.expires = jiffies + 2 * HZ;
328 add_timer(&ax25->dtimer);
330 struct sock *sk=ax25->sk;
340 * dl1bke 960311: set parameters for existing AX.25 connections,
341 * includes a KILL command to abort any connection.
342 * VERY useful for debugging ;-)
344 static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg)
346 struct ax25_ctl_struct ax25_ctl;
353 if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl)))
356 if ((ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr)) == NULL)
359 if (ax25_ctl.digi_count > AX25_MAX_DIGIS)
362 if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL)
365 digi.ndigi = ax25_ctl.digi_count;
366 for (k = 0; k < digi.ndigi; k++)
367 digi.calls[k] = ax25_ctl.digi_addr[k];
369 if ((ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev)) == NULL)
372 switch (ax25_ctl.cmd) {
374 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
375 #ifdef CONFIG_AX25_DAMA_SLAVE
376 if (ax25_dev->dama.slave && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE)
379 ax25_disconnect(ax25, ENETRESET);
383 if (ax25->modulus == AX25_MODULUS) {
384 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7)
387 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63)
390 ax25->window = ax25_ctl.arg;
394 if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ)
396 ax25->rtt = (ax25_ctl.arg * HZ) / 2;
397 ax25->t1 = ax25_ctl.arg * HZ;
401 if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ)
403 ax25->t2 = ax25_ctl.arg * HZ;
407 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31)
410 ax25->n2 = ax25_ctl.arg;
414 if (ax25_ctl.arg > ULONG_MAX / HZ)
416 ax25->t3 = ax25_ctl.arg * HZ;
420 if (ax25_ctl.arg > ULONG_MAX / (60 * HZ))
423 ax25->idle = ax25_ctl.arg * 60 * HZ;
427 if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535)
429 ax25->paclen = ax25_ctl.arg;
445 static void ax25_fillin_cb_from_dev(ax25_cb *ax25, ax25_dev *ax25_dev)
447 ax25->rtt = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]) / 2;
448 ax25->t1 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]);
449 ax25->t2 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T2]);
450 ax25->t3 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T3]);
451 ax25->n2 = ax25_dev->values[AX25_VALUES_N2];
452 ax25->paclen = ax25_dev->values[AX25_VALUES_PACLEN];
453 ax25->idle = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_IDLE]);
454 ax25->backoff = ax25_dev->values[AX25_VALUES_BACKOFF];
456 if (ax25_dev->values[AX25_VALUES_AXDEFMODE]) {
457 ax25->modulus = AX25_EMODULUS;
458 ax25->window = ax25_dev->values[AX25_VALUES_EWINDOW];
460 ax25->modulus = AX25_MODULUS;
461 ax25->window = ax25_dev->values[AX25_VALUES_WINDOW];
466 * Fill in a created AX.25 created control block with the default
467 * values for a particular device.
469 void ax25_fillin_cb(ax25_cb *ax25, ax25_dev *ax25_dev)
471 ax25->ax25_dev = ax25_dev;
473 if (ax25->ax25_dev != NULL) {
474 ax25_fillin_cb_from_dev(ax25, ax25_dev);
479 * No device, use kernel / AX.25 spec default values
481 ax25->rtt = msecs_to_jiffies(AX25_DEF_T1) / 2;
482 ax25->t1 = msecs_to_jiffies(AX25_DEF_T1);
483 ax25->t2 = msecs_to_jiffies(AX25_DEF_T2);
484 ax25->t3 = msecs_to_jiffies(AX25_DEF_T3);
485 ax25->n2 = AX25_DEF_N2;
486 ax25->paclen = AX25_DEF_PACLEN;
487 ax25->idle = msecs_to_jiffies(AX25_DEF_IDLE);
488 ax25->backoff = AX25_DEF_BACKOFF;
490 if (AX25_DEF_AXDEFMODE) {
491 ax25->modulus = AX25_EMODULUS;
492 ax25->window = AX25_DEF_EWINDOW;
494 ax25->modulus = AX25_MODULUS;
495 ax25->window = AX25_DEF_WINDOW;
500 * Create an empty AX.25 control block.
502 ax25_cb *ax25_create_cb(void)
506 if ((ax25 = kzalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL)
509 refcount_set(&ax25->refcount, 1);
511 skb_queue_head_init(&ax25->write_queue);
512 skb_queue_head_init(&ax25->frag_queue);
513 skb_queue_head_init(&ax25->ack_queue);
514 skb_queue_head_init(&ax25->reseq_queue);
516 ax25_setup_timers(ax25);
518 ax25_fillin_cb(ax25, NULL);
520 ax25->state = AX25_STATE_0;
526 * Handling for system calls applied via the various interfaces to an
530 static int ax25_setsockopt(struct socket *sock, int level, int optname,
531 char __user *optval, unsigned int optlen)
533 struct sock *sk = sock->sk;
535 struct net_device *dev;
536 char devname[IFNAMSIZ];
540 if (level != SOL_AX25)
543 if (optlen < sizeof(unsigned int))
546 if (get_user(opt, (unsigned int __user *)optval))
550 ax25 = sk_to_ax25(sk);
554 if (ax25->modulus == AX25_MODULUS) {
555 if (opt < 1 || opt > 7) {
560 if (opt < 1 || opt > 63) {
569 if (opt < 1 || opt > ULONG_MAX / HZ) {
573 ax25->rtt = (opt * HZ) >> 1;
578 if (opt < 1 || opt > ULONG_MAX / HZ) {
586 if (opt < 1 || opt > 31) {
594 if (opt < 1 || opt > ULONG_MAX / HZ) {
602 if (opt > ULONG_MAX / (60 * HZ)) {
606 ax25->idle = opt * 60 * HZ;
618 ax25->modulus = opt ? AX25_EMODULUS : AX25_MODULUS;
622 ax25->pidincl = opt ? 1 : 0;
626 ax25->iamdigi = opt ? 1 : 0;
630 if (opt < 16 || opt > 65535) {
637 case SO_BINDTODEVICE:
638 if (optlen > IFNAMSIZ)
641 if (copy_from_user(devname, optval, optlen)) {
646 if (sk->sk_type == SOCK_SEQPACKET &&
647 (sock->state != SS_UNCONNECTED ||
648 sk->sk_state == TCP_LISTEN)) {
649 res = -EADDRNOTAVAIL;
654 dev = __dev_get_by_name(&init_net, devname);
661 ax25->ax25_dev = ax25_dev_ax25dev(dev);
662 if (!ax25->ax25_dev) {
667 ax25_fillin_cb(ax25, ax25->ax25_dev);
679 static int ax25_getsockopt(struct socket *sock, int level, int optname,
680 char __user *optval, int __user *optlen)
682 struct sock *sk = sock->sk;
684 struct ax25_dev *ax25_dev;
685 char devname[IFNAMSIZ];
690 if (level != SOL_AX25)
693 if (get_user(maxlen, optlen))
699 valptr = (void *) &val;
700 length = min_t(unsigned int, maxlen, sizeof(int));
703 ax25 = sk_to_ax25(sk);
727 val = ax25->idle / (60 * HZ);
735 val = (ax25->modulus == AX25_EMODULUS);
750 case SO_BINDTODEVICE:
751 ax25_dev = ax25->ax25_dev;
753 if (ax25_dev != NULL && ax25_dev->dev != NULL) {
754 strlcpy(devname, ax25_dev->dev->name, sizeof(devname));
755 length = strlen(devname) + 1;
761 valptr = (void *) devname;
770 if (put_user(length, optlen))
773 return copy_to_user(optval, valptr, length) ? -EFAULT : 0;
776 static int ax25_listen(struct socket *sock, int backlog)
778 struct sock *sk = sock->sk;
782 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_LISTEN) {
783 sk->sk_max_ack_backlog = backlog;
784 sk->sk_state = TCP_LISTEN;
796 * XXX: when creating ax25_sock we should update the .obj_size setting
799 static struct proto ax25_proto = {
801 .owner = THIS_MODULE,
802 .obj_size = sizeof(struct ax25_sock),
805 static int ax25_create(struct net *net, struct socket *sock, int protocol,
811 if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
814 if (!net_eq(net, &init_net))
815 return -EAFNOSUPPORT;
817 switch (sock->type) {
819 if (protocol == 0 || protocol == PF_AX25)
820 protocol = AX25_P_TEXT;
826 case PF_AX25: /* For CLX */
827 protocol = AX25_P_TEXT;
840 return -ESOCKTNOSUPPORT;
841 #ifdef CONFIG_NETROM_MODULE
843 if (ax25_protocol_is_registered(AX25_P_NETROM))
844 return -ESOCKTNOSUPPORT;
847 #ifdef CONFIG_ROSE_MODULE
849 if (ax25_protocol_is_registered(AX25_P_ROSE))
850 return -ESOCKTNOSUPPORT;
860 return -ESOCKTNOSUPPORT;
863 sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto, kern);
867 ax25 = ax25_sk(sk)->cb = ax25_create_cb();
873 sock_init_data(sock, sk);
875 sk->sk_destruct = ax25_free_sock;
876 sock->ops = &ax25_proto_ops;
877 sk->sk_protocol = protocol;
884 struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev)
887 ax25_cb *ax25, *oax25;
889 sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot, 0);
893 if ((ax25 = ax25_create_cb()) == NULL) {
898 switch (osk->sk_type) {
909 sock_init_data(NULL, sk);
911 sk->sk_type = osk->sk_type;
912 sk->sk_priority = osk->sk_priority;
913 sk->sk_protocol = osk->sk_protocol;
914 sk->sk_rcvbuf = osk->sk_rcvbuf;
915 sk->sk_sndbuf = osk->sk_sndbuf;
916 sk->sk_state = TCP_ESTABLISHED;
917 sock_copy_flags(sk, osk);
919 oax25 = sk_to_ax25(osk);
921 ax25->modulus = oax25->modulus;
922 ax25->backoff = oax25->backoff;
923 ax25->pidincl = oax25->pidincl;
924 ax25->iamdigi = oax25->iamdigi;
925 ax25->rtt = oax25->rtt;
926 ax25->t1 = oax25->t1;
927 ax25->t2 = oax25->t2;
928 ax25->t3 = oax25->t3;
929 ax25->n2 = oax25->n2;
930 ax25->idle = oax25->idle;
931 ax25->paclen = oax25->paclen;
932 ax25->window = oax25->window;
934 ax25->ax25_dev = ax25_dev;
935 ax25->source_addr = oax25->source_addr;
937 if (oax25->digipeat != NULL) {
938 ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi),
940 if (ax25->digipeat == NULL) {
947 ax25_sk(sk)->cb = ax25;
948 sk->sk_destruct = ax25_free_sock;
954 static int ax25_release(struct socket *sock)
956 struct sock *sk = sock->sk;
965 ax25 = sk_to_ax25(sk);
967 if (sk->sk_type == SOCK_SEQPACKET) {
968 switch (ax25->state) {
971 ax25_disconnect(ax25, 0);
973 ax25_destroy_socket(ax25);
978 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
980 ax25_disconnect(ax25, 0);
982 if (!sock_flag(ax25->sk, SOCK_DESTROY))
983 ax25_destroy_socket(ax25);
988 ax25_clear_queues(ax25);
991 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
992 case AX25_PROTO_STD_SIMPLEX:
993 case AX25_PROTO_STD_DUPLEX:
994 ax25_send_control(ax25,
998 ax25_stop_t2timer(ax25);
999 ax25_stop_t3timer(ax25);
1000 ax25_stop_idletimer(ax25);
1002 #ifdef CONFIG_AX25_DAMA_SLAVE
1003 case AX25_PROTO_DAMA_SLAVE:
1004 ax25_stop_t3timer(ax25);
1005 ax25_stop_idletimer(ax25);
1009 ax25_calculate_t1(ax25);
1010 ax25_start_t1timer(ax25);
1011 ax25->state = AX25_STATE_2;
1012 sk->sk_state = TCP_CLOSE;
1013 sk->sk_shutdown |= SEND_SHUTDOWN;
1014 sk->sk_state_change(sk);
1015 sock_set_flag(sk, SOCK_DESTROY);
1022 sk->sk_state = TCP_CLOSE;
1023 sk->sk_shutdown |= SEND_SHUTDOWN;
1024 sk->sk_state_change(sk);
1025 ax25_destroy_socket(ax25);
1036 * We support a funny extension here so you can (as root) give any callsign
1037 * digipeated via a local address as source. This hack is obsolete now
1038 * that we've implemented support for SO_BINDTODEVICE. It is however small
1039 * and trivially backward compatible.
1041 static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1043 struct sock *sk = sock->sk;
1044 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
1045 ax25_dev *ax25_dev = NULL;
1046 ax25_uid_assoc *user;
1051 if (addr_len != sizeof(struct sockaddr_ax25) &&
1052 addr_len != sizeof(struct full_sockaddr_ax25))
1053 /* support for old structure may go away some time
1054 * ax25_bind(): uses old (6 digipeater) socket structure.
1056 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1057 (addr_len > sizeof(struct full_sockaddr_ax25)))
1060 if (addr->fsa_ax25.sax25_family != AF_AX25)
1063 user = ax25_findbyuid(current_euid());
1068 if (ax25_uid_policy && !capable(CAP_NET_ADMIN))
1071 call = addr->fsa_ax25.sax25_call;
1076 ax25 = sk_to_ax25(sk);
1077 if (!sock_flag(sk, SOCK_ZAPPED)) {
1082 ax25->source_addr = call;
1085 * User already set interface with SO_BINDTODEVICE
1087 if (ax25->ax25_dev != NULL)
1090 if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) {
1091 if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 &&
1092 (ax25_dev = ax25_addr_ax25dev(&addr->fsa_digipeater[0])) == NULL) {
1093 err = -EADDRNOTAVAIL;
1097 if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) {
1098 err = -EADDRNOTAVAIL;
1103 if (ax25_dev != NULL)
1104 ax25_fillin_cb(ax25, ax25_dev);
1108 sock_reset_flag(sk, SOCK_ZAPPED);
1117 * FIXME: nonblock behaviour looks like it may have a bug.
1119 static int __must_check ax25_connect(struct socket *sock,
1120 struct sockaddr *uaddr, int addr_len, int flags)
1122 struct sock *sk = sock->sk;
1123 ax25_cb *ax25 = sk_to_ax25(sk), *ax25t;
1124 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1125 ax25_digi *digi = NULL;
1126 int ct = 0, err = 0;
1129 * some sanity checks. code further down depends on this
1132 if (addr_len == sizeof(struct sockaddr_ax25))
1133 /* support for this will go away in early 2.5.x
1134 * ax25_connect(): uses obsolete socket structure
1137 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1138 /* support for old structure may go away some time
1139 * ax25_connect(): uses old (6 digipeater) socket structure.
1141 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1142 (addr_len > sizeof(struct full_sockaddr_ax25)))
1146 if (fsa->fsa_ax25.sax25_family != AF_AX25)
1151 /* deal with restarts */
1152 if (sock->state == SS_CONNECTING) {
1153 switch (sk->sk_state) {
1154 case TCP_SYN_SENT: /* still trying */
1158 case TCP_ESTABLISHED: /* connection established */
1159 sock->state = SS_CONNECTED;
1162 case TCP_CLOSE: /* connection refused */
1163 sock->state = SS_UNCONNECTED;
1164 err = -ECONNREFUSED;
1169 if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) {
1170 err = -EISCONN; /* No reconnect on a seqpacket socket */
1174 sk->sk_state = TCP_CLOSE;
1175 sock->state = SS_UNCONNECTED;
1177 kfree(ax25->digipeat);
1178 ax25->digipeat = NULL;
1181 * Handle digi-peaters to be used.
1183 if (addr_len > sizeof(struct sockaddr_ax25) &&
1184 fsa->fsa_ax25.sax25_ndigis != 0) {
1185 /* Valid number of digipeaters ? */
1186 if (fsa->fsa_ax25.sax25_ndigis < 1 || fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS) {
1191 if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
1196 digi->ndigi = fsa->fsa_ax25.sax25_ndigis;
1197 digi->lastrepeat = -1;
1199 while (ct < fsa->fsa_ax25.sax25_ndigis) {
1200 if ((fsa->fsa_digipeater[ct].ax25_call[6] &
1201 AX25_HBIT) && ax25->iamdigi) {
1202 digi->repeated[ct] = 1;
1203 digi->lastrepeat = ct;
1205 digi->repeated[ct] = 0;
1207 digi->calls[ct] = fsa->fsa_digipeater[ct];
1213 * Must bind first - autobinding in this may or may not work. If
1214 * the socket is already bound, check to see if the device has
1215 * been filled in, error if it hasn't.
1217 if (sock_flag(sk, SOCK_ZAPPED)) {
1218 /* check if we can remove this feature. It is broken. */
1219 printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n",
1221 if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) {
1226 ax25_fillin_cb(ax25, ax25->ax25_dev);
1229 if (ax25->ax25_dev == NULL) {
1231 err = -EHOSTUNREACH;
1236 if (sk->sk_type == SOCK_SEQPACKET &&
1237 (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi,
1238 ax25->ax25_dev->dev))) {
1240 err = -EADDRINUSE; /* Already such a connection */
1245 ax25->dest_addr = fsa->fsa_ax25.sax25_call;
1246 ax25->digipeat = digi;
1248 /* First the easy one */
1249 if (sk->sk_type != SOCK_SEQPACKET) {
1250 sock->state = SS_CONNECTED;
1251 sk->sk_state = TCP_ESTABLISHED;
1255 /* Move to connecting socket, ax.25 lapb WAIT_UA.. */
1256 sock->state = SS_CONNECTING;
1257 sk->sk_state = TCP_SYN_SENT;
1259 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
1260 case AX25_PROTO_STD_SIMPLEX:
1261 case AX25_PROTO_STD_DUPLEX:
1262 ax25_std_establish_data_link(ax25);
1265 #ifdef CONFIG_AX25_DAMA_SLAVE
1266 case AX25_PROTO_DAMA_SLAVE:
1267 ax25->modulus = AX25_MODULUS;
1268 ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
1269 if (ax25->ax25_dev->dama.slave)
1270 ax25_ds_establish_data_link(ax25);
1272 ax25_std_establish_data_link(ax25);
1277 ax25->state = AX25_STATE_1;
1279 ax25_start_heartbeat(ax25);
1282 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
1287 if (sk->sk_state == TCP_SYN_SENT) {
1291 prepare_to_wait(sk_sleep(sk), &wait,
1292 TASK_INTERRUPTIBLE);
1293 if (sk->sk_state != TCP_SYN_SENT)
1295 if (!signal_pending(current)) {
1304 finish_wait(sk_sleep(sk), &wait);
1310 if (sk->sk_state != TCP_ESTABLISHED) {
1311 /* Not in ABM, not in WAIT_UA -> failed */
1312 sock->state = SS_UNCONNECTED;
1313 err = sock_error(sk); /* Always set at this point */
1317 sock->state = SS_CONNECTED;
1326 static int ax25_accept(struct socket *sock, struct socket *newsock, int flags,
1329 struct sk_buff *skb;
1335 if (sock->state != SS_UNCONNECTED)
1338 if ((sk = sock->sk) == NULL)
1342 if (sk->sk_type != SOCK_SEQPACKET) {
1347 if (sk->sk_state != TCP_LISTEN) {
1353 * The read queue this time is holding sockets ready to use
1354 * hooked into the SABM we saved
1357 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1358 skb = skb_dequeue(&sk->sk_receive_queue);
1362 if (flags & O_NONBLOCK) {
1366 if (!signal_pending(current)) {
1375 finish_wait(sk_sleep(sk), &wait);
1381 sock_graft(newsk, newsock);
1383 /* Now attach up the new socket */
1385 sk->sk_ack_backlog--;
1386 newsock->state = SS_CONNECTED;
1394 static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
1397 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1398 struct sock *sk = sock->sk;
1399 unsigned char ndigi, i;
1403 memset(fsa, 0, sizeof(*fsa));
1405 ax25 = sk_to_ax25(sk);
1408 if (sk->sk_state != TCP_ESTABLISHED) {
1413 fsa->fsa_ax25.sax25_family = AF_AX25;
1414 fsa->fsa_ax25.sax25_call = ax25->dest_addr;
1416 if (ax25->digipeat != NULL) {
1417 ndigi = ax25->digipeat->ndigi;
1418 fsa->fsa_ax25.sax25_ndigis = ndigi;
1419 for (i = 0; i < ndigi; i++)
1420 fsa->fsa_digipeater[i] =
1421 ax25->digipeat->calls[i];
1424 fsa->fsa_ax25.sax25_family = AF_AX25;
1425 fsa->fsa_ax25.sax25_call = ax25->source_addr;
1426 fsa->fsa_ax25.sax25_ndigis = 1;
1427 if (ax25->ax25_dev != NULL) {
1428 memcpy(&fsa->fsa_digipeater[0],
1429 ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN);
1431 fsa->fsa_digipeater[0] = null_ax25_address;
1434 err = sizeof (struct full_sockaddr_ax25);
1442 static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1444 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1445 struct sock *sk = sock->sk;
1446 struct sockaddr_ax25 sax;
1447 struct sk_buff *skb;
1448 ax25_digi dtmp, *dp;
1451 int lv, err, addr_len = msg->msg_namelen;
1453 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1457 ax25 = sk_to_ax25(sk);
1459 if (sock_flag(sk, SOCK_ZAPPED)) {
1460 err = -EADDRNOTAVAIL;
1464 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1465 send_sig(SIGPIPE, current, 0);
1470 if (ax25->ax25_dev == NULL) {
1475 if (len > ax25->ax25_dev->dev->mtu) {
1481 if (usax->sax25_family != AF_AX25) {
1486 if (addr_len == sizeof(struct sockaddr_ax25))
1487 /* ax25_sendmsg(): uses obsolete socket structure */
1489 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1490 /* support for old structure may go away some time
1491 * ax25_sendmsg(): uses old (6 digipeater)
1494 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1495 (addr_len > sizeof(struct full_sockaddr_ax25))) {
1501 if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) {
1503 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax;
1505 /* Valid number of digipeaters ? */
1506 if (usax->sax25_ndigis < 1 || usax->sax25_ndigis > AX25_MAX_DIGIS) {
1511 dtmp.ndigi = usax->sax25_ndigis;
1513 while (ct < usax->sax25_ndigis) {
1514 dtmp.repeated[ct] = 0;
1515 dtmp.calls[ct] = fsa->fsa_digipeater[ct];
1519 dtmp.lastrepeat = 0;
1523 if (sk->sk_type == SOCK_SEQPACKET &&
1524 ax25cmp(&ax25->dest_addr, &sax.sax25_call)) {
1528 if (usax->sax25_ndigis == 0)
1534 * FIXME: 1003.1g - if the socket is like this because
1535 * it has become closed (not started closed) and is VC
1536 * we ought to SIGPIPE, EPIPE
1538 if (sk->sk_state != TCP_ESTABLISHED) {
1542 sax.sax25_family = AF_AX25;
1543 sax.sax25_call = ax25->dest_addr;
1544 dp = ax25->digipeat;
1547 /* Build a packet */
1548 /* Assume the worst case */
1549 size = len + ax25->ax25_dev->dev->hard_header_len;
1551 skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err);
1555 skb_reserve(skb, size - len);
1557 /* User data follows immediately after the AX.25 data */
1558 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1564 skb_reset_network_header(skb);
1566 /* Add the PID if one is not supplied by the user in the skb */
1568 *(u8 *)skb_push(skb, 1) = sk->sk_protocol;
1570 if (sk->sk_type == SOCK_SEQPACKET) {
1571 /* Connected mode sockets go via the LAPB machine */
1572 if (sk->sk_state != TCP_ESTABLISHED) {
1578 /* Shove it onto the queue and kick */
1579 ax25_output(ax25, ax25->paclen, skb);
1585 skb_push(skb, 1 + ax25_addr_size(dp));
1587 /* Building AX.25 Header */
1589 /* Build an AX.25 header */
1590 lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call,
1591 dp, AX25_COMMAND, AX25_MODULUS);
1593 skb_set_transport_header(skb, lv);
1595 *skb_transport_header(skb) = AX25_UI;
1597 /* Datagram frames go straight out of the door as UI */
1598 ax25_queue_xmit(skb, ax25->ax25_dev->dev);
1608 static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1611 struct sock *sk = sock->sk;
1612 struct sk_buff *skb;
1618 * This works for seqpacket too. The receiver has ordered the
1619 * queue for us! We do one quick check first though
1621 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) {
1626 /* Now we can treat all alike */
1627 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1628 flags & MSG_DONTWAIT, &err);
1632 if (!sk_to_ax25(sk)->pidincl)
1633 skb_pull(skb, 1); /* Remove PID */
1635 skb_reset_transport_header(skb);
1638 if (copied > size) {
1640 msg->msg_flags |= MSG_TRUNC;
1643 skb_copy_datagram_msg(skb, 0, msg, copied);
1645 if (msg->msg_name) {
1648 const unsigned char *mac = skb_mac_header(skb);
1649 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1651 memset(sax, 0, sizeof(struct full_sockaddr_ax25));
1652 ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL,
1654 sax->sax25_family = AF_AX25;
1655 /* We set this correctly, even though we may not let the
1656 application know the digi calls further down (because it
1657 did NOT ask to know them). This could get political... **/
1658 sax->sax25_ndigis = digi.ndigi;
1659 sax->sax25_call = src;
1661 if (sax->sax25_ndigis != 0) {
1663 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax;
1665 for (ct = 0; ct < digi.ndigi; ct++)
1666 fsa->fsa_digipeater[ct] = digi.calls[ct];
1668 msg->msg_namelen = sizeof(struct full_sockaddr_ax25);
1671 skb_free_datagram(sk, skb);
1680 static int ax25_shutdown(struct socket *sk, int how)
1682 /* FIXME - generate DM and RNR states */
1686 static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1688 struct sock *sk = sock->sk;
1689 void __user *argp = (void __user *)arg;
1697 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1700 res = put_user(amount, (int __user *)argp);
1705 struct sk_buff *skb;
1707 /* These two are safe on a single CPU system as only user tasks fiddle here */
1708 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1710 res = put_user(amount, (int __user *) argp);
1714 case SIOCAX25ADDUID: /* Add a uid to the uid/call map table */
1715 case SIOCAX25DELUID: /* Delete a uid from the uid/call map table */
1716 case SIOCAX25GETUID: {
1717 struct sockaddr_ax25 sax25;
1718 if (copy_from_user(&sax25, argp, sizeof(sax25))) {
1722 res = ax25_uid_ioctl(cmd, &sax25);
1726 case SIOCAX25NOUID: { /* Set the default policy (default/bar) */
1728 if (!capable(CAP_NET_ADMIN)) {
1732 if (get_user(amount, (long __user *)argp)) {
1736 if (amount < 0 || amount > AX25_NOUID_BLOCK) {
1740 ax25_uid_policy = amount;
1748 if (!capable(CAP_NET_ADMIN)) {
1752 res = ax25_rt_ioctl(cmd, argp);
1755 case SIOCAX25CTLCON:
1756 if (!capable(CAP_NET_ADMIN)) {
1760 res = ax25_ctl_ioctl(cmd, argp);
1763 case SIOCAX25GETINFO:
1764 case SIOCAX25GETINFOOLD: {
1765 ax25_cb *ax25 = sk_to_ax25(sk);
1766 struct ax25_info_struct ax25_info;
1768 ax25_info.t1 = ax25->t1 / HZ;
1769 ax25_info.t2 = ax25->t2 / HZ;
1770 ax25_info.t3 = ax25->t3 / HZ;
1771 ax25_info.idle = ax25->idle / (60 * HZ);
1772 ax25_info.n2 = ax25->n2;
1773 ax25_info.t1timer = ax25_display_timer(&ax25->t1timer) / HZ;
1774 ax25_info.t2timer = ax25_display_timer(&ax25->t2timer) / HZ;
1775 ax25_info.t3timer = ax25_display_timer(&ax25->t3timer) / HZ;
1776 ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ);
1777 ax25_info.n2count = ax25->n2count;
1778 ax25_info.state = ax25->state;
1779 ax25_info.rcv_q = sk_rmem_alloc_get(sk);
1780 ax25_info.snd_q = sk_wmem_alloc_get(sk);
1781 ax25_info.vs = ax25->vs;
1782 ax25_info.vr = ax25->vr;
1783 ax25_info.va = ax25->va;
1784 ax25_info.vs_max = ax25->vs; /* reserved */
1785 ax25_info.paclen = ax25->paclen;
1786 ax25_info.window = ax25->window;
1788 /* old structure? */
1789 if (cmd == SIOCAX25GETINFOOLD) {
1790 static int warned = 0;
1792 printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n",
1797 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) {
1802 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) {
1811 case SIOCAX25ADDFWD:
1812 case SIOCAX25DELFWD: {
1813 struct ax25_fwd_struct ax25_fwd;
1814 if (!capable(CAP_NET_ADMIN)) {
1818 if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) {
1822 res = ax25_fwd_ioctl(cmd, &ax25_fwd);
1828 case SIOCGIFDSTADDR:
1829 case SIOCSIFDSTADDR:
1830 case SIOCGIFBRDADDR:
1831 case SIOCSIFBRDADDR:
1832 case SIOCGIFNETMASK:
1833 case SIOCSIFNETMASK:
1848 #ifdef CONFIG_PROC_FS
1850 static void *ax25_info_start(struct seq_file *seq, loff_t *pos)
1851 __acquires(ax25_list_lock)
1853 spin_lock_bh(&ax25_list_lock);
1854 return seq_hlist_start(&ax25_list, *pos);
1857 static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos)
1859 return seq_hlist_next(v, &ax25_list, pos);
1862 static void ax25_info_stop(struct seq_file *seq, void *v)
1863 __releases(ax25_list_lock)
1865 spin_unlock_bh(&ax25_list_lock);
1868 static int ax25_info_show(struct seq_file *seq, void *v)
1870 ax25_cb *ax25 = hlist_entry(v, struct ax25_cb, ax25_node);
1877 * magic dev src_addr dest_addr,digi1,digi2,.. st vs vr va t1 t1 t2 t2 t3 t3 idle idle n2 n2 rtt window paclen Snd-Q Rcv-Q inode
1880 seq_printf(seq, "%p %s %s%s ",
1882 ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name,
1883 ax2asc(buf, &ax25->source_addr),
1884 ax25->iamdigi? "*":"");
1885 seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr));
1887 for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) {
1888 seq_printf(seq, ",%s%s",
1889 ax2asc(buf, &ax25->digipeat->calls[k]),
1890 ax25->digipeat->repeated[k]? "*":"");
1893 seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d",
1895 ax25->vs, ax25->vr, ax25->va,
1896 ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ,
1897 ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ,
1898 ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ,
1899 ax25_display_timer(&ax25->idletimer) / (60 * HZ),
1900 ax25->idle / (60 * HZ),
1901 ax25->n2count, ax25->n2,
1906 if (ax25->sk != NULL) {
1907 seq_printf(seq, " %d %d %lu\n",
1908 sk_wmem_alloc_get(ax25->sk),
1909 sk_rmem_alloc_get(ax25->sk),
1910 sock_i_ino(ax25->sk));
1912 seq_puts(seq, " * * *\n");
1917 static const struct seq_operations ax25_info_seqops = {
1918 .start = ax25_info_start,
1919 .next = ax25_info_next,
1920 .stop = ax25_info_stop,
1921 .show = ax25_info_show,
1925 static const struct net_proto_family ax25_family_ops = {
1927 .create = ax25_create,
1928 .owner = THIS_MODULE,
1931 static const struct proto_ops ax25_proto_ops = {
1933 .owner = THIS_MODULE,
1934 .release = ax25_release,
1936 .connect = ax25_connect,
1937 .socketpair = sock_no_socketpair,
1938 .accept = ax25_accept,
1939 .getname = ax25_getname,
1940 .poll = datagram_poll,
1941 .ioctl = ax25_ioctl,
1942 .gettstamp = sock_gettstamp,
1943 .listen = ax25_listen,
1944 .shutdown = ax25_shutdown,
1945 .setsockopt = ax25_setsockopt,
1946 .getsockopt = ax25_getsockopt,
1947 .sendmsg = ax25_sendmsg,
1948 .recvmsg = ax25_recvmsg,
1949 .mmap = sock_no_mmap,
1950 .sendpage = sock_no_sendpage,
1954 * Called by socket.c on kernel start up
1956 static struct packet_type ax25_packet_type __read_mostly = {
1957 .type = cpu_to_be16(ETH_P_AX25),
1958 .func = ax25_kiss_rcv,
1961 static struct notifier_block ax25_dev_notifier = {
1962 .notifier_call = ax25_device_event,
1965 static int __init ax25_init(void)
1967 int rc = proto_register(&ax25_proto, 0);
1972 sock_register(&ax25_family_ops);
1973 dev_add_pack(&ax25_packet_type);
1974 register_netdevice_notifier(&ax25_dev_notifier);
1976 proc_create_seq("ax25_route", 0444, init_net.proc_net, &ax25_rt_seqops);
1977 proc_create_seq("ax25", 0444, init_net.proc_net, &ax25_info_seqops);
1978 proc_create_seq("ax25_calls", 0444, init_net.proc_net,
1983 module_init(ax25_init);
1986 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1987 MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol");
1988 MODULE_LICENSE("GPL");
1989 MODULE_ALIAS_NETPROTO(PF_AX25);
1991 static void __exit ax25_exit(void)
1993 remove_proc_entry("ax25_route", init_net.proc_net);
1994 remove_proc_entry("ax25", init_net.proc_net);
1995 remove_proc_entry("ax25_calls", init_net.proc_net);
1997 unregister_netdevice_notifier(&ax25_dev_notifier);
1999 dev_remove_pack(&ax25_packet_type);
2001 sock_unregister(PF_AX25);
2002 proto_unregister(&ax25_proto);
2008 module_exit(ax25_exit);