2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
8 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
9 * Copyright (C) Darryl Miles G7LED (dlm@g7led.demon.co.uk)
10 * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
11 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
12 * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
13 * Copyright (C) Hans Alblas PE1AYX (hans@esrac.ele.tue.nl)
14 * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
16 #include <linux/capability.h>
17 #include <linux/module.h>
18 #include <linux/errno.h>
19 #include <linux/types.h>
20 #include <linux/socket.h>
22 #include <linux/kernel.h>
23 #include <linux/sched.h>
24 #include <linux/timer.h>
25 #include <linux/string.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/slab.h>
30 #include <linux/inet.h>
31 #include <linux/netdevice.h>
32 #include <linux/if_arp.h>
33 #include <linux/skbuff.h>
35 #include <asm/uaccess.h>
36 #include <asm/system.h>
37 #include <linux/fcntl.h>
38 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
40 #include <linux/interrupt.h>
41 #include <linux/notifier.h>
42 #include <linux/proc_fs.h>
43 #include <linux/stat.h>
44 #include <linux/netfilter.h>
45 #include <linux/sysctl.h>
46 #include <linux/init.h>
47 #include <linux/spinlock.h>
48 #include <net/net_namespace.h>
49 #include <net/tcp_states.h>
55 HLIST_HEAD(ax25_list);
56 DEFINE_SPINLOCK(ax25_list_lock);
58 static const struct proto_ops ax25_proto_ops;
60 static void ax25_free_sock(struct sock *sk)
62 ax25_cb_put(ax25_sk(sk));
66 * Socket removal during an interrupt is now safe.
68 static void ax25_cb_del(ax25_cb *ax25)
70 if (!hlist_unhashed(&ax25->ax25_node)) {
71 spin_lock_bh(&ax25_list_lock);
72 hlist_del_init(&ax25->ax25_node);
73 spin_unlock_bh(&ax25_list_lock);
79 * Kill all bound sockets on a dropped device.
81 static void ax25_kill_by_device(struct net_device *dev)
85 struct hlist_node *node;
87 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
90 spin_lock_bh(&ax25_list_lock);
92 ax25_for_each(s, node, &ax25_list) {
93 if (s->ax25_dev == ax25_dev) {
95 spin_unlock_bh(&ax25_list_lock);
96 ax25_disconnect(s, ENETUNREACH);
97 spin_lock_bh(&ax25_list_lock);
99 /* The entry could have been deleted from the
100 * list meanwhile and thus the next pointer is
101 * no longer valid. Play it safe and restart
102 * the scan. Forward progress is ensured
103 * because we set s->ax25_dev to NULL and we
104 * are never passed a NULL 'dev' argument.
109 spin_unlock_bh(&ax25_list_lock);
113 * Handle device status changes.
115 static int ax25_device_event(struct notifier_block *this, unsigned long event,
118 struct net_device *dev = (struct net_device *)ptr;
120 if (!net_eq(dev_net(dev), &init_net))
123 /* Reject non AX.25 devices */
124 if (dev->type != ARPHRD_AX25)
129 ax25_dev_device_up(dev);
132 ax25_kill_by_device(dev);
133 ax25_rt_device_down(dev);
134 ax25_dev_device_down(dev);
144 * Add a socket to the bound sockets list.
146 void ax25_cb_add(ax25_cb *ax25)
148 spin_lock_bh(&ax25_list_lock);
150 hlist_add_head(&ax25->ax25_node, &ax25_list);
151 spin_unlock_bh(&ax25_list_lock);
155 * Find a socket that wants to accept the SABM we have just
158 struct sock *ax25_find_listener(ax25_address *addr, int digi,
159 struct net_device *dev, int type)
162 struct hlist_node *node;
164 spin_lock(&ax25_list_lock);
165 ax25_for_each(s, node, &ax25_list) {
166 if ((s->iamdigi && !digi) || (!s->iamdigi && digi))
168 if (s->sk && !ax25cmp(&s->source_addr, addr) &&
169 s->sk->sk_type == type && s->sk->sk_state == TCP_LISTEN) {
170 /* If device is null we match any device */
171 if (s->ax25_dev == NULL || s->ax25_dev->dev == dev) {
173 spin_unlock(&ax25_list_lock);
178 spin_unlock(&ax25_list_lock);
184 * Find an AX.25 socket given both ends.
186 struct sock *ax25_get_socket(ax25_address *my_addr, ax25_address *dest_addr,
189 struct sock *sk = NULL;
191 struct hlist_node *node;
193 spin_lock(&ax25_list_lock);
194 ax25_for_each(s, node, &ax25_list) {
195 if (s->sk && !ax25cmp(&s->source_addr, my_addr) &&
196 !ax25cmp(&s->dest_addr, dest_addr) &&
197 s->sk->sk_type == type) {
204 spin_unlock(&ax25_list_lock);
210 * Find an AX.25 control block given both ends. It will only pick up
211 * floating AX.25 control blocks or non Raw socket bound control blocks.
213 ax25_cb *ax25_find_cb(ax25_address *src_addr, ax25_address *dest_addr,
214 ax25_digi *digi, struct net_device *dev)
217 struct hlist_node *node;
219 spin_lock_bh(&ax25_list_lock);
220 ax25_for_each(s, node, &ax25_list) {
221 if (s->sk && s->sk->sk_type != SOCK_SEQPACKET)
223 if (s->ax25_dev == NULL)
225 if (ax25cmp(&s->source_addr, src_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->ax25_dev->dev == dev) {
226 if (digi != NULL && digi->ndigi != 0) {
227 if (s->digipeat == NULL)
229 if (ax25digicmp(s->digipeat, digi) != 0)
232 if (s->digipeat != NULL && s->digipeat->ndigi != 0)
236 spin_unlock_bh(&ax25_list_lock);
241 spin_unlock_bh(&ax25_list_lock);
246 EXPORT_SYMBOL(ax25_find_cb);
248 void ax25_send_to_raw(ax25_address *addr, struct sk_buff *skb, int proto)
251 struct sk_buff *copy;
252 struct hlist_node *node;
254 spin_lock(&ax25_list_lock);
255 ax25_for_each(s, node, &ax25_list) {
256 if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 &&
257 s->sk->sk_type == SOCK_RAW &&
258 s->sk->sk_protocol == proto &&
259 s->ax25_dev->dev == skb->dev &&
260 atomic_read(&s->sk->sk_rmem_alloc) <= s->sk->sk_rcvbuf) {
261 if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL)
263 if (sock_queue_rcv_skb(s->sk, copy) != 0)
267 spin_unlock(&ax25_list_lock);
273 void ax25_destroy_socket(ax25_cb *);
276 * Handler for deferred kills.
278 static void ax25_destroy_timer(unsigned long data)
280 ax25_cb *ax25=(ax25_cb *)data;
287 ax25_destroy_socket(ax25);
293 * This is called from user mode and the timers. Thus it protects itself
294 * against interrupt users but doesn't worry about being called during
295 * work. Once it is removed from the queue no interrupt or bottom half
296 * will touch it and we are (fairly 8-) ) safe.
298 void ax25_destroy_socket(ax25_cb *ax25)
304 ax25_stop_heartbeat(ax25);
305 ax25_stop_t1timer(ax25);
306 ax25_stop_t2timer(ax25);
307 ax25_stop_t3timer(ax25);
308 ax25_stop_idletimer(ax25);
310 ax25_clear_queues(ax25); /* Flush the queues */
312 if (ax25->sk != NULL) {
313 while ((skb = skb_dequeue(&ax25->sk->sk_receive_queue)) != NULL) {
314 if (skb->sk != ax25->sk) {
315 /* A pending connection */
316 ax25_cb *sax25 = ax25_sk(skb->sk);
318 /* Queue the unaccepted socket for death */
319 sock_orphan(skb->sk);
321 /* 9A4GL: hack to release unaccepted sockets */
322 skb->sk->sk_state = TCP_LISTEN;
324 ax25_start_heartbeat(sax25);
325 sax25->state = AX25_STATE_0;
330 skb_queue_purge(&ax25->sk->sk_write_queue);
333 if (ax25->sk != NULL) {
334 if (sk_has_allocations(ax25->sk)) {
335 /* Defer: outstanding buffers */
336 setup_timer(&ax25->dtimer, ax25_destroy_timer,
337 (unsigned long)ax25);
338 ax25->dtimer.expires = jiffies + 2 * HZ;
339 add_timer(&ax25->dtimer);
341 struct sock *sk=ax25->sk;
351 * dl1bke 960311: set parameters for existing AX.25 connections,
352 * includes a KILL command to abort any connection.
353 * VERY useful for debugging ;-)
355 static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg)
357 struct ax25_ctl_struct ax25_ctl;
364 if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl)))
367 if ((ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr)) == NULL)
370 if (ax25_ctl.digi_count > AX25_MAX_DIGIS)
373 if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL)
376 digi.ndigi = ax25_ctl.digi_count;
377 for (k = 0; k < digi.ndigi; k++)
378 digi.calls[k] = ax25_ctl.digi_addr[k];
380 if ((ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev)) == NULL)
383 switch (ax25_ctl.cmd) {
385 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
386 #ifdef CONFIG_AX25_DAMA_SLAVE
387 if (ax25_dev->dama.slave && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE)
390 ax25_disconnect(ax25, ENETRESET);
394 if (ax25->modulus == AX25_MODULUS) {
395 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7)
398 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63)
401 ax25->window = ax25_ctl.arg;
405 if (ax25_ctl.arg < 1)
407 ax25->rtt = (ax25_ctl.arg * HZ) / 2;
408 ax25->t1 = ax25_ctl.arg * HZ;
412 if (ax25_ctl.arg < 1)
414 ax25->t2 = ax25_ctl.arg * HZ;
418 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31)
421 ax25->n2 = ax25_ctl.arg;
425 ax25->t3 = ax25_ctl.arg * HZ;
429 ax25->idle = ax25_ctl.arg * 60 * HZ;
433 if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535)
435 ax25->paclen = ax25_ctl.arg;
451 static void ax25_fillin_cb_from_dev(ax25_cb *ax25, ax25_dev *ax25_dev)
453 ax25->rtt = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]) / 2;
454 ax25->t1 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]);
455 ax25->t2 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T2]);
456 ax25->t3 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T3]);
457 ax25->n2 = ax25_dev->values[AX25_VALUES_N2];
458 ax25->paclen = ax25_dev->values[AX25_VALUES_PACLEN];
459 ax25->idle = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_IDLE]);
460 ax25->backoff = ax25_dev->values[AX25_VALUES_BACKOFF];
462 if (ax25_dev->values[AX25_VALUES_AXDEFMODE]) {
463 ax25->modulus = AX25_EMODULUS;
464 ax25->window = ax25_dev->values[AX25_VALUES_EWINDOW];
466 ax25->modulus = AX25_MODULUS;
467 ax25->window = ax25_dev->values[AX25_VALUES_WINDOW];
472 * Fill in a created AX.25 created control block with the default
473 * values for a particular device.
475 void ax25_fillin_cb(ax25_cb *ax25, ax25_dev *ax25_dev)
477 ax25->ax25_dev = ax25_dev;
479 if (ax25->ax25_dev != NULL) {
480 ax25_fillin_cb_from_dev(ax25, ax25_dev);
485 * No device, use kernel / AX.25 spec default values
487 ax25->rtt = msecs_to_jiffies(AX25_DEF_T1) / 2;
488 ax25->t1 = msecs_to_jiffies(AX25_DEF_T1);
489 ax25->t2 = msecs_to_jiffies(AX25_DEF_T2);
490 ax25->t3 = msecs_to_jiffies(AX25_DEF_T3);
491 ax25->n2 = AX25_DEF_N2;
492 ax25->paclen = AX25_DEF_PACLEN;
493 ax25->idle = msecs_to_jiffies(AX25_DEF_IDLE);
494 ax25->backoff = AX25_DEF_BACKOFF;
496 if (AX25_DEF_AXDEFMODE) {
497 ax25->modulus = AX25_EMODULUS;
498 ax25->window = AX25_DEF_EWINDOW;
500 ax25->modulus = AX25_MODULUS;
501 ax25->window = AX25_DEF_WINDOW;
506 * Create an empty AX.25 control block.
508 ax25_cb *ax25_create_cb(void)
512 if ((ax25 = kzalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL)
515 atomic_set(&ax25->refcount, 1);
517 skb_queue_head_init(&ax25->write_queue);
518 skb_queue_head_init(&ax25->frag_queue);
519 skb_queue_head_init(&ax25->ack_queue);
520 skb_queue_head_init(&ax25->reseq_queue);
522 ax25_setup_timers(ax25);
524 ax25_fillin_cb(ax25, NULL);
526 ax25->state = AX25_STATE_0;
532 * Handling for system calls applied via the various interfaces to an
536 static int ax25_setsockopt(struct socket *sock, int level, int optname,
537 char __user *optval, unsigned int optlen)
539 struct sock *sk = sock->sk;
541 struct net_device *dev;
542 char devname[IFNAMSIZ];
545 if (level != SOL_AX25)
548 if (optlen < sizeof(int))
551 if (get_user(opt, (int __user *)optval))
559 if (ax25->modulus == AX25_MODULUS) {
560 if (opt < 1 || opt > 7) {
565 if (opt < 1 || opt > 63) {
578 ax25->rtt = (opt * HZ) >> 1;
591 if (opt < 1 || opt > 31) {
611 ax25->idle = opt * 60 * HZ;
615 if (opt < 0 || opt > 2) {
623 ax25->modulus = opt ? AX25_EMODULUS : AX25_MODULUS;
627 ax25->pidincl = opt ? 1 : 0;
631 ax25->iamdigi = opt ? 1 : 0;
635 if (opt < 16 || opt > 65535) {
642 case SO_BINDTODEVICE:
643 if (optlen > IFNAMSIZ)
646 if (copy_from_user(devname, optval, optlen)) {
651 if (sk->sk_type == SOCK_SEQPACKET &&
652 (sock->state != SS_UNCONNECTED ||
653 sk->sk_state == TCP_LISTEN)) {
654 res = -EADDRNOTAVAIL;
658 dev = dev_get_by_name(&init_net, devname);
664 ax25->ax25_dev = ax25_dev_ax25dev(dev);
665 ax25_fillin_cb(ax25, ax25->ax25_dev);
677 static int ax25_getsockopt(struct socket *sock, int level, int optname,
678 char __user *optval, int __user *optlen)
680 struct sock *sk = sock->sk;
682 struct ax25_dev *ax25_dev;
683 char devname[IFNAMSIZ];
688 if (level != SOL_AX25)
691 if (get_user(maxlen, optlen))
697 valptr = (void *) &val;
698 length = min_t(unsigned int, maxlen, sizeof(int));
725 val = ax25->idle / (60 * HZ);
733 val = (ax25->modulus == AX25_EMODULUS);
748 case SO_BINDTODEVICE:
749 ax25_dev = ax25->ax25_dev;
751 if (ax25_dev != NULL && ax25_dev->dev != NULL) {
752 strlcpy(devname, ax25_dev->dev->name, sizeof(devname));
753 length = strlen(devname) + 1;
759 valptr = (void *) devname;
768 if (put_user(length, optlen))
771 return copy_to_user(optval, valptr, length) ? -EFAULT : 0;
774 static int ax25_listen(struct socket *sock, int backlog)
776 struct sock *sk = sock->sk;
780 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_LISTEN) {
781 sk->sk_max_ack_backlog = backlog;
782 sk->sk_state = TCP_LISTEN;
794 * XXX: when creating ax25_sock we should update the .obj_size setting
797 static struct proto ax25_proto = {
799 .owner = THIS_MODULE,
800 .obj_size = sizeof(struct sock),
803 static int ax25_create(struct net *net, struct socket *sock, int protocol,
809 if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
812 if (!net_eq(net, &init_net))
813 return -EAFNOSUPPORT;
815 switch (sock->type) {
817 if (protocol == 0 || protocol == PF_AX25)
818 protocol = AX25_P_TEXT;
824 case PF_AX25: /* For CLX */
825 protocol = AX25_P_TEXT;
838 return -ESOCKTNOSUPPORT;
839 #ifdef CONFIG_NETROM_MODULE
841 if (ax25_protocol_is_registered(AX25_P_NETROM))
842 return -ESOCKTNOSUPPORT;
844 #ifdef CONFIG_ROSE_MODULE
846 if (ax25_protocol_is_registered(AX25_P_ROSE))
847 return -ESOCKTNOSUPPORT;
857 return -ESOCKTNOSUPPORT;
860 sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto);
864 ax25 = sk->sk_protinfo = ax25_create_cb();
870 sock_init_data(sock, sk);
872 sk->sk_destruct = ax25_free_sock;
873 sock->ops = &ax25_proto_ops;
874 sk->sk_protocol = protocol;
881 struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev)
884 ax25_cb *ax25, *oax25;
886 sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot);
890 if ((ax25 = ax25_create_cb()) == NULL) {
895 switch (osk->sk_type) {
906 sock_init_data(NULL, sk);
908 sk->sk_type = osk->sk_type;
909 sk->sk_priority = osk->sk_priority;
910 sk->sk_protocol = osk->sk_protocol;
911 sk->sk_rcvbuf = osk->sk_rcvbuf;
912 sk->sk_sndbuf = osk->sk_sndbuf;
913 sk->sk_state = TCP_ESTABLISHED;
914 sock_copy_flags(sk, osk);
916 oax25 = ax25_sk(osk);
918 ax25->modulus = oax25->modulus;
919 ax25->backoff = oax25->backoff;
920 ax25->pidincl = oax25->pidincl;
921 ax25->iamdigi = oax25->iamdigi;
922 ax25->rtt = oax25->rtt;
923 ax25->t1 = oax25->t1;
924 ax25->t2 = oax25->t2;
925 ax25->t3 = oax25->t3;
926 ax25->n2 = oax25->n2;
927 ax25->idle = oax25->idle;
928 ax25->paclen = oax25->paclen;
929 ax25->window = oax25->window;
931 ax25->ax25_dev = ax25_dev;
932 ax25->source_addr = oax25->source_addr;
934 if (oax25->digipeat != NULL) {
935 ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi),
937 if (ax25->digipeat == NULL) {
944 sk->sk_protinfo = ax25;
945 sk->sk_destruct = ax25_free_sock;
951 static int ax25_release(struct socket *sock)
953 struct sock *sk = sock->sk;
964 if (sk->sk_type == SOCK_SEQPACKET) {
965 switch (ax25->state) {
968 ax25_disconnect(ax25, 0);
970 ax25_destroy_socket(ax25);
975 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
977 ax25_disconnect(ax25, 0);
979 ax25_destroy_socket(ax25);
984 ax25_clear_queues(ax25);
987 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
988 case AX25_PROTO_STD_SIMPLEX:
989 case AX25_PROTO_STD_DUPLEX:
990 ax25_send_control(ax25,
994 ax25_stop_t2timer(ax25);
995 ax25_stop_t3timer(ax25);
996 ax25_stop_idletimer(ax25);
998 #ifdef CONFIG_AX25_DAMA_SLAVE
999 case AX25_PROTO_DAMA_SLAVE:
1000 ax25_stop_t3timer(ax25);
1001 ax25_stop_idletimer(ax25);
1005 ax25_calculate_t1(ax25);
1006 ax25_start_t1timer(ax25);
1007 ax25->state = AX25_STATE_2;
1008 sk->sk_state = TCP_CLOSE;
1009 sk->sk_shutdown |= SEND_SHUTDOWN;
1010 sk->sk_state_change(sk);
1011 sock_set_flag(sk, SOCK_DESTROY);
1018 sk->sk_state = TCP_CLOSE;
1019 sk->sk_shutdown |= SEND_SHUTDOWN;
1020 sk->sk_state_change(sk);
1021 ax25_destroy_socket(ax25);
1032 * We support a funny extension here so you can (as root) give any callsign
1033 * digipeated via a local address as source. This hack is obsolete now
1034 * that we've implemented support for SO_BINDTODEVICE. It is however small
1035 * and trivially backward compatible.
1037 static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1039 struct sock *sk = sock->sk;
1040 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
1041 ax25_dev *ax25_dev = NULL;
1042 ax25_uid_assoc *user;
1047 if (addr_len != sizeof(struct sockaddr_ax25) &&
1048 addr_len != sizeof(struct full_sockaddr_ax25))
1049 /* support for old structure may go away some time
1050 * ax25_bind(): uses old (6 digipeater) socket structure.
1052 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1053 (addr_len > sizeof(struct full_sockaddr_ax25)))
1056 if (addr->fsa_ax25.sax25_family != AF_AX25)
1059 user = ax25_findbyuid(current_euid());
1064 if (ax25_uid_policy && !capable(CAP_NET_ADMIN))
1067 call = addr->fsa_ax25.sax25_call;
1073 if (!sock_flag(sk, SOCK_ZAPPED)) {
1078 ax25->source_addr = call;
1081 * User already set interface with SO_BINDTODEVICE
1083 if (ax25->ax25_dev != NULL)
1086 if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) {
1087 if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 &&
1088 (ax25_dev = ax25_addr_ax25dev(&addr->fsa_digipeater[0])) == NULL) {
1089 err = -EADDRNOTAVAIL;
1093 if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) {
1094 err = -EADDRNOTAVAIL;
1099 if (ax25_dev != NULL)
1100 ax25_fillin_cb(ax25, ax25_dev);
1104 sock_reset_flag(sk, SOCK_ZAPPED);
1113 * FIXME: nonblock behaviour looks like it may have a bug.
1115 static int __must_check ax25_connect(struct socket *sock,
1116 struct sockaddr *uaddr, int addr_len, int flags)
1118 struct sock *sk = sock->sk;
1119 ax25_cb *ax25 = ax25_sk(sk), *ax25t;
1120 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1121 ax25_digi *digi = NULL;
1122 int ct = 0, err = 0;
1125 * some sanity checks. code further down depends on this
1128 if (addr_len == sizeof(struct sockaddr_ax25))
1129 /* support for this will go away in early 2.5.x
1130 * ax25_connect(): uses obsolete socket structure
1133 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1134 /* support for old structure may go away some time
1135 * ax25_connect(): uses old (6 digipeater) socket structure.
1137 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1138 (addr_len > sizeof(struct full_sockaddr_ax25)))
1142 if (fsa->fsa_ax25.sax25_family != AF_AX25)
1147 /* deal with restarts */
1148 if (sock->state == SS_CONNECTING) {
1149 switch (sk->sk_state) {
1150 case TCP_SYN_SENT: /* still trying */
1154 case TCP_ESTABLISHED: /* connection established */
1155 sock->state = SS_CONNECTED;
1158 case TCP_CLOSE: /* connection refused */
1159 sock->state = SS_UNCONNECTED;
1160 err = -ECONNREFUSED;
1165 if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) {
1166 err = -EISCONN; /* No reconnect on a seqpacket socket */
1170 sk->sk_state = TCP_CLOSE;
1171 sock->state = SS_UNCONNECTED;
1173 kfree(ax25->digipeat);
1174 ax25->digipeat = NULL;
1177 * Handle digi-peaters to be used.
1179 if (addr_len > sizeof(struct sockaddr_ax25) &&
1180 fsa->fsa_ax25.sax25_ndigis != 0) {
1181 /* Valid number of digipeaters ? */
1182 if (fsa->fsa_ax25.sax25_ndigis < 1 || fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS) {
1187 if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
1192 digi->ndigi = fsa->fsa_ax25.sax25_ndigis;
1193 digi->lastrepeat = -1;
1195 while (ct < fsa->fsa_ax25.sax25_ndigis) {
1196 if ((fsa->fsa_digipeater[ct].ax25_call[6] &
1197 AX25_HBIT) && ax25->iamdigi) {
1198 digi->repeated[ct] = 1;
1199 digi->lastrepeat = ct;
1201 digi->repeated[ct] = 0;
1203 digi->calls[ct] = fsa->fsa_digipeater[ct];
1209 * Must bind first - autobinding in this may or may not work. If
1210 * the socket is already bound, check to see if the device has
1211 * been filled in, error if it hasn't.
1213 if (sock_flag(sk, SOCK_ZAPPED)) {
1214 /* check if we can remove this feature. It is broken. */
1215 printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n",
1217 if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) {
1222 ax25_fillin_cb(ax25, ax25->ax25_dev);
1225 if (ax25->ax25_dev == NULL) {
1227 err = -EHOSTUNREACH;
1232 if (sk->sk_type == SOCK_SEQPACKET &&
1233 (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi,
1234 ax25->ax25_dev->dev))) {
1236 err = -EADDRINUSE; /* Already such a connection */
1241 ax25->dest_addr = fsa->fsa_ax25.sax25_call;
1242 ax25->digipeat = digi;
1244 /* First the easy one */
1245 if (sk->sk_type != SOCK_SEQPACKET) {
1246 sock->state = SS_CONNECTED;
1247 sk->sk_state = TCP_ESTABLISHED;
1251 /* Move to connecting socket, ax.25 lapb WAIT_UA.. */
1252 sock->state = SS_CONNECTING;
1253 sk->sk_state = TCP_SYN_SENT;
1255 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
1256 case AX25_PROTO_STD_SIMPLEX:
1257 case AX25_PROTO_STD_DUPLEX:
1258 ax25_std_establish_data_link(ax25);
1261 #ifdef CONFIG_AX25_DAMA_SLAVE
1262 case AX25_PROTO_DAMA_SLAVE:
1263 ax25->modulus = AX25_MODULUS;
1264 ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
1265 if (ax25->ax25_dev->dama.slave)
1266 ax25_ds_establish_data_link(ax25);
1268 ax25_std_establish_data_link(ax25);
1273 ax25->state = AX25_STATE_1;
1275 ax25_start_heartbeat(ax25);
1278 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
1283 if (sk->sk_state == TCP_SYN_SENT) {
1287 prepare_to_wait(sk_sleep(sk), &wait,
1288 TASK_INTERRUPTIBLE);
1289 if (sk->sk_state != TCP_SYN_SENT)
1291 if (!signal_pending(current)) {
1300 finish_wait(sk_sleep(sk), &wait);
1306 if (sk->sk_state != TCP_ESTABLISHED) {
1307 /* Not in ABM, not in WAIT_UA -> failed */
1308 sock->state = SS_UNCONNECTED;
1309 err = sock_error(sk); /* Always set at this point */
1313 sock->state = SS_CONNECTED;
1322 static int ax25_accept(struct socket *sock, struct socket *newsock, int flags)
1324 struct sk_buff *skb;
1330 if (sock->state != SS_UNCONNECTED)
1333 if ((sk = sock->sk) == NULL)
1337 if (sk->sk_type != SOCK_SEQPACKET) {
1342 if (sk->sk_state != TCP_LISTEN) {
1348 * The read queue this time is holding sockets ready to use
1349 * hooked into the SABM we saved
1352 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1353 skb = skb_dequeue(&sk->sk_receive_queue);
1357 if (flags & O_NONBLOCK) {
1361 if (!signal_pending(current)) {
1370 finish_wait(sk_sleep(sk), &wait);
1376 sock_graft(newsk, newsock);
1378 /* Now attach up the new socket */
1380 sk->sk_ack_backlog--;
1381 newsock->state = SS_CONNECTED;
1389 static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
1390 int *uaddr_len, int peer)
1392 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1393 struct sock *sk = sock->sk;
1394 unsigned char ndigi, i;
1398 memset(fsa, 0, sizeof(*fsa));
1403 if (sk->sk_state != TCP_ESTABLISHED) {
1408 fsa->fsa_ax25.sax25_family = AF_AX25;
1409 fsa->fsa_ax25.sax25_call = ax25->dest_addr;
1411 if (ax25->digipeat != NULL) {
1412 ndigi = ax25->digipeat->ndigi;
1413 fsa->fsa_ax25.sax25_ndigis = ndigi;
1414 for (i = 0; i < ndigi; i++)
1415 fsa->fsa_digipeater[i] =
1416 ax25->digipeat->calls[i];
1419 fsa->fsa_ax25.sax25_family = AF_AX25;
1420 fsa->fsa_ax25.sax25_call = ax25->source_addr;
1421 fsa->fsa_ax25.sax25_ndigis = 1;
1422 if (ax25->ax25_dev != NULL) {
1423 memcpy(&fsa->fsa_digipeater[0],
1424 ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN);
1426 fsa->fsa_digipeater[0] = null_ax25_address;
1429 *uaddr_len = sizeof (struct full_sockaddr_ax25);
1437 static int ax25_sendmsg(struct kiocb *iocb, struct socket *sock,
1438 struct msghdr *msg, size_t len)
1440 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
1441 struct sock *sk = sock->sk;
1442 struct sockaddr_ax25 sax;
1443 struct sk_buff *skb;
1444 ax25_digi dtmp, *dp;
1447 int lv, err, addr_len = msg->msg_namelen;
1449 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1455 if (sock_flag(sk, SOCK_ZAPPED)) {
1456 err = -EADDRNOTAVAIL;
1460 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1461 send_sig(SIGPIPE, current, 0);
1466 if (ax25->ax25_dev == NULL) {
1471 if (len > ax25->ax25_dev->dev->mtu) {
1477 if (usax->sax25_family != AF_AX25) {
1482 if (addr_len == sizeof(struct sockaddr_ax25))
1483 /* ax25_sendmsg(): uses obsolete socket structure */
1485 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1486 /* support for old structure may go away some time
1487 * ax25_sendmsg(): uses old (6 digipeater)
1490 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1491 (addr_len > sizeof(struct full_sockaddr_ax25))) {
1497 if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) {
1499 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax;
1501 /* Valid number of digipeaters ? */
1502 if (usax->sax25_ndigis < 1 || usax->sax25_ndigis > AX25_MAX_DIGIS) {
1507 dtmp.ndigi = usax->sax25_ndigis;
1509 while (ct < usax->sax25_ndigis) {
1510 dtmp.repeated[ct] = 0;
1511 dtmp.calls[ct] = fsa->fsa_digipeater[ct];
1515 dtmp.lastrepeat = 0;
1519 if (sk->sk_type == SOCK_SEQPACKET &&
1520 ax25cmp(&ax25->dest_addr, &sax.sax25_call)) {
1524 if (usax->sax25_ndigis == 0)
1530 * FIXME: 1003.1g - if the socket is like this because
1531 * it has become closed (not started closed) and is VC
1532 * we ought to SIGPIPE, EPIPE
1534 if (sk->sk_state != TCP_ESTABLISHED) {
1538 sax.sax25_family = AF_AX25;
1539 sax.sax25_call = ax25->dest_addr;
1540 dp = ax25->digipeat;
1543 /* Build a packet */
1544 /* Assume the worst case */
1545 size = len + ax25->ax25_dev->dev->hard_header_len;
1547 skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err);
1551 skb_reserve(skb, size - len);
1553 /* User data follows immediately after the AX.25 data */
1554 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
1560 skb_reset_network_header(skb);
1562 /* Add the PID if one is not supplied by the user in the skb */
1564 *skb_push(skb, 1) = sk->sk_protocol;
1566 if (sk->sk_type == SOCK_SEQPACKET) {
1567 /* Connected mode sockets go via the LAPB machine */
1568 if (sk->sk_state != TCP_ESTABLISHED) {
1574 /* Shove it onto the queue and kick */
1575 ax25_output(ax25, ax25->paclen, skb);
1581 skb_push(skb, 1 + ax25_addr_size(dp));
1583 /* Building AX.25 Header */
1585 /* Build an AX.25 header */
1586 lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call,
1587 dp, AX25_COMMAND, AX25_MODULUS);
1589 skb_set_transport_header(skb, lv);
1591 *skb_transport_header(skb) = AX25_UI;
1593 /* Datagram frames go straight out of the door as UI */
1594 ax25_queue_xmit(skb, ax25->ax25_dev->dev);
1604 static int ax25_recvmsg(struct kiocb *iocb, struct socket *sock,
1605 struct msghdr *msg, size_t size, int flags)
1607 struct sock *sk = sock->sk;
1608 struct sk_buff *skb;
1614 * This works for seqpacket too. The receiver has ordered the
1615 * queue for us! We do one quick check first though
1617 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) {
1622 /* Now we can treat all alike */
1623 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1624 flags & MSG_DONTWAIT, &err);
1628 if (!ax25_sk(sk)->pidincl)
1629 skb_pull(skb, 1); /* Remove PID */
1631 skb_reset_transport_header(skb);
1634 if (copied > size) {
1636 msg->msg_flags |= MSG_TRUNC;
1639 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1641 if (msg->msg_name) {
1644 const unsigned char *mac = skb_mac_header(skb);
1645 struct sockaddr_ax25 *sax = msg->msg_name;
1647 memset(sax, 0, sizeof(struct full_sockaddr_ax25));
1648 ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL,
1650 sax->sax25_family = AF_AX25;
1651 /* We set this correctly, even though we may not let the
1652 application know the digi calls further down (because it
1653 did NOT ask to know them). This could get political... **/
1654 sax->sax25_ndigis = digi.ndigi;
1655 sax->sax25_call = src;
1657 if (sax->sax25_ndigis != 0) {
1659 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax;
1661 for (ct = 0; ct < digi.ndigi; ct++)
1662 fsa->fsa_digipeater[ct] = digi.calls[ct];
1664 msg->msg_namelen = sizeof(struct full_sockaddr_ax25);
1667 skb_free_datagram(sk, skb);
1676 static int ax25_shutdown(struct socket *sk, int how)
1678 /* FIXME - generate DM and RNR states */
1682 static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1684 struct sock *sk = sock->sk;
1685 void __user *argp = (void __user *)arg;
1693 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1696 res = put_user(amount, (int __user *)argp);
1701 struct sk_buff *skb;
1703 /* These two are safe on a single CPU system as only user tasks fiddle here */
1704 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1706 res = put_user(amount, (int __user *) argp);
1711 res = sock_get_timestamp(sk, argp);
1715 res = sock_get_timestampns(sk, argp);
1718 case SIOCAX25ADDUID: /* Add a uid to the uid/call map table */
1719 case SIOCAX25DELUID: /* Delete a uid from the uid/call map table */
1720 case SIOCAX25GETUID: {
1721 struct sockaddr_ax25 sax25;
1722 if (copy_from_user(&sax25, argp, sizeof(sax25))) {
1726 res = ax25_uid_ioctl(cmd, &sax25);
1730 case SIOCAX25NOUID: { /* Set the default policy (default/bar) */
1732 if (!capable(CAP_NET_ADMIN)) {
1736 if (get_user(amount, (long __user *)argp)) {
1740 if (amount > AX25_NOUID_BLOCK) {
1744 ax25_uid_policy = amount;
1752 if (!capable(CAP_NET_ADMIN)) {
1756 res = ax25_rt_ioctl(cmd, argp);
1759 case SIOCAX25CTLCON:
1760 if (!capable(CAP_NET_ADMIN)) {
1764 res = ax25_ctl_ioctl(cmd, argp);
1767 case SIOCAX25GETINFO:
1768 case SIOCAX25GETINFOOLD: {
1769 ax25_cb *ax25 = ax25_sk(sk);
1770 struct ax25_info_struct ax25_info;
1772 ax25_info.t1 = ax25->t1 / HZ;
1773 ax25_info.t2 = ax25->t2 / HZ;
1774 ax25_info.t3 = ax25->t3 / HZ;
1775 ax25_info.idle = ax25->idle / (60 * HZ);
1776 ax25_info.n2 = ax25->n2;
1777 ax25_info.t1timer = ax25_display_timer(&ax25->t1timer) / HZ;
1778 ax25_info.t2timer = ax25_display_timer(&ax25->t2timer) / HZ;
1779 ax25_info.t3timer = ax25_display_timer(&ax25->t3timer) / HZ;
1780 ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ);
1781 ax25_info.n2count = ax25->n2count;
1782 ax25_info.state = ax25->state;
1783 ax25_info.rcv_q = sk_rmem_alloc_get(sk);
1784 ax25_info.snd_q = sk_wmem_alloc_get(sk);
1785 ax25_info.vs = ax25->vs;
1786 ax25_info.vr = ax25->vr;
1787 ax25_info.va = ax25->va;
1788 ax25_info.vs_max = ax25->vs; /* reserved */
1789 ax25_info.paclen = ax25->paclen;
1790 ax25_info.window = ax25->window;
1792 /* old structure? */
1793 if (cmd == SIOCAX25GETINFOOLD) {
1794 static int warned = 0;
1796 printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n",
1801 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) {
1806 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) {
1815 case SIOCAX25ADDFWD:
1816 case SIOCAX25DELFWD: {
1817 struct ax25_fwd_struct ax25_fwd;
1818 if (!capable(CAP_NET_ADMIN)) {
1822 if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) {
1826 res = ax25_fwd_ioctl(cmd, &ax25_fwd);
1832 case SIOCGIFDSTADDR:
1833 case SIOCSIFDSTADDR:
1834 case SIOCGIFBRDADDR:
1835 case SIOCSIFBRDADDR:
1836 case SIOCGIFNETMASK:
1837 case SIOCSIFNETMASK:
1852 #ifdef CONFIG_PROC_FS
1854 static void *ax25_info_start(struct seq_file *seq, loff_t *pos)
1855 __acquires(ax25_list_lock)
1857 spin_lock_bh(&ax25_list_lock);
1858 return seq_hlist_start(&ax25_list, *pos);
1861 static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos)
1863 return seq_hlist_next(v, &ax25_list, pos);
1866 static void ax25_info_stop(struct seq_file *seq, void *v)
1867 __releases(ax25_list_lock)
1869 spin_unlock_bh(&ax25_list_lock);
1872 static int ax25_info_show(struct seq_file *seq, void *v)
1874 ax25_cb *ax25 = hlist_entry(v, struct ax25_cb, ax25_node);
1881 * 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
1884 seq_printf(seq, "%8.8lx %s %s%s ",
1886 ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name,
1887 ax2asc(buf, &ax25->source_addr),
1888 ax25->iamdigi? "*":"");
1889 seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr));
1891 for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) {
1892 seq_printf(seq, ",%s%s",
1893 ax2asc(buf, &ax25->digipeat->calls[k]),
1894 ax25->digipeat->repeated[k]? "*":"");
1897 seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d",
1899 ax25->vs, ax25->vr, ax25->va,
1900 ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ,
1901 ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ,
1902 ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ,
1903 ax25_display_timer(&ax25->idletimer) / (60 * HZ),
1904 ax25->idle / (60 * HZ),
1905 ax25->n2count, ax25->n2,
1910 if (ax25->sk != NULL) {
1911 seq_printf(seq, " %d %d %lu\n",
1912 sk_wmem_alloc_get(ax25->sk),
1913 sk_rmem_alloc_get(ax25->sk),
1914 sock_i_ino(ax25->sk));
1916 seq_puts(seq, " * * *\n");
1921 static const struct seq_operations ax25_info_seqops = {
1922 .start = ax25_info_start,
1923 .next = ax25_info_next,
1924 .stop = ax25_info_stop,
1925 .show = ax25_info_show,
1928 static int ax25_info_open(struct inode *inode, struct file *file)
1930 return seq_open(file, &ax25_info_seqops);
1933 static const struct file_operations ax25_info_fops = {
1934 .owner = THIS_MODULE,
1935 .open = ax25_info_open,
1937 .llseek = seq_lseek,
1938 .release = seq_release,
1943 static const struct net_proto_family ax25_family_ops = {
1945 .create = ax25_create,
1946 .owner = THIS_MODULE,
1949 static const struct proto_ops ax25_proto_ops = {
1951 .owner = THIS_MODULE,
1952 .release = ax25_release,
1954 .connect = ax25_connect,
1955 .socketpair = sock_no_socketpair,
1956 .accept = ax25_accept,
1957 .getname = ax25_getname,
1958 .poll = datagram_poll,
1959 .ioctl = ax25_ioctl,
1960 .listen = ax25_listen,
1961 .shutdown = ax25_shutdown,
1962 .setsockopt = ax25_setsockopt,
1963 .getsockopt = ax25_getsockopt,
1964 .sendmsg = ax25_sendmsg,
1965 .recvmsg = ax25_recvmsg,
1966 .mmap = sock_no_mmap,
1967 .sendpage = sock_no_sendpage,
1971 * Called by socket.c on kernel start up
1973 static struct packet_type ax25_packet_type __read_mostly = {
1974 .type = cpu_to_be16(ETH_P_AX25),
1975 .func = ax25_kiss_rcv,
1978 static struct notifier_block ax25_dev_notifier = {
1979 .notifier_call =ax25_device_event,
1982 static int __init ax25_init(void)
1984 int rc = proto_register(&ax25_proto, 0);
1989 sock_register(&ax25_family_ops);
1990 dev_add_pack(&ax25_packet_type);
1991 register_netdevice_notifier(&ax25_dev_notifier);
1992 ax25_register_sysctl();
1994 proc_net_fops_create(&init_net, "ax25_route", S_IRUGO, &ax25_route_fops);
1995 proc_net_fops_create(&init_net, "ax25", S_IRUGO, &ax25_info_fops);
1996 proc_net_fops_create(&init_net, "ax25_calls", S_IRUGO, &ax25_uid_fops);
2000 module_init(ax25_init);
2003 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
2004 MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol");
2005 MODULE_LICENSE("GPL");
2006 MODULE_ALIAS_NETPROTO(PF_AX25);
2008 static void __exit ax25_exit(void)
2010 proc_net_remove(&init_net, "ax25_route");
2011 proc_net_remove(&init_net, "ax25");
2012 proc_net_remove(&init_net, "ax25_calls");
2014 unregister_netdevice_notifier(&ax25_dev_notifier);
2015 ax25_unregister_sysctl();
2017 dev_remove_pack(&ax25_packet_type);
2019 sock_unregister(PF_AX25);
2020 proto_unregister(&ax25_proto);
2026 module_exit(ax25_exit);