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ax25: Fix netdev refcount issue
[linux-2.6-block.git] / net / ax25 / af_ax25.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 2/*
1da177e4
LT		 3 *
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)
12 */
4fc268d2 13#include <linux/capability.h>
1da177e4
LT		 14#include <linux/module.h>
15#include <linux/errno.h>
16#include <linux/types.h>
17#include <linux/socket.h>
18#include <linux/in.h>
19#include <linux/kernel.h>
3f07c014 20#include <linux/sched/signal.h>
1da177e4
LT		 21#include <linux/timer.h>
22#include <linux/string.h>
1da177e4
LT		 23#include <linux/sockios.h>
24#include <linux/net.h>
5a0e3ad6 25#include <linux/slab.h>
1da177e4
LT		 26#include <net/ax25.h>
27#include <linux/inet.h>
28#include <linux/netdevice.h>
29#include <linux/if_arp.h>
30#include <linux/skbuff.h>
31#include <net/sock.h>
7c0f6ba6 32#include <linux/uaccess.h>
1da177e4
LT		 33#include <linux/fcntl.h>
34#include <linux/termios.h> /* For TIOCINQ/OUTQ */
35#include <linux/mm.h>
36#include <linux/interrupt.h>
37#include <linux/notifier.h>
38#include <linux/proc_fs.h>
39#include <linux/stat.h>
1da177e4
LT		 40#include <linux/sysctl.h>
41#include <linux/init.h>
42#include <linux/spinlock.h>
457c4cbc 43#include <net/net_namespace.h>
c752f073 44#include <net/tcp_states.h>
1da177e4
LT		 45#include <net/ip.h>
46#include <net/arp.h>
47
48
49
50HLIST_HEAD(ax25_list);
51DEFINE_SPINLOCK(ax25_list_lock);
52
90ddc4f0 53static const struct proto_ops ax25_proto_ops;
1da177e4
LT		 54
55static void ax25_free_sock(struct sock *sk)
56{
3200392b 57 ax25_cb_put(sk_to_ax25(sk));
1da177e4
LT		 58}
59
60/*
61 * Socket removal during an interrupt is now safe.
62 */
63static void ax25_cb_del(ax25_cb *ax25)
64{
7d8a3a47 65 spin_lock_bh(&ax25_list_lock);
1da177e4 66 if (!hlist_unhashed(&ax25->ax25_node)) {
1da177e4 67 hlist_del_init(&ax25->ax25_node);
1da177e4
LT		 68 ax25_cb_put(ax25);
69 }
7d8a3a47 70 spin_unlock_bh(&ax25_list_lock);
1da177e4
LT		 71}
72
73/*
74 * Kill all bound sockets on a dropped device.
75 */
76static void ax25_kill_by_device(struct net_device *dev)
77{
78 ax25_dev *ax25_dev;
79 ax25_cb *s;
4e0f718d 80 struct sock *sk;
1da177e4
LT		 81
82 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
83 return;
7d8a3a47 84 ax25_dev->device_up = false;
1da177e4
LT		 85
86 spin_lock_bh(&ax25_list_lock);
ecd2ebde 87again:
b67bfe0d 88 ax25_for_each(s, &ax25_list) {
1da177e4 89 if (s->ax25_dev == ax25_dev) {
4e0f718d 90 sk = s->sk;
71171ac8
DZ		 91 if (!sk) {
92 spin_unlock_bh(&ax25_list_lock);
71171ac8 93 ax25_disconnect(s, ENETUNREACH);
fc6d01ff 94 s->ax25_dev = NULL;
7d8a3a47 95 ax25_cb_del(s);
71171ac8
DZ		 96 spin_lock_bh(&ax25_list_lock);
97 goto again;
98 }
4e0f718d 99 sock_hold(sk);
ecd2ebde 100 spin_unlock_bh(&ax25_list_lock);
4e0f718d 101 lock_sock(sk);
fc6d01ff 102 ax25_disconnect(s, ENETUNREACH);
1ade48d0 103 s->ax25_dev = NULL;
9fd75b66 104 if (sk->sk_socket) {
d62607c3 105 netdev_put(ax25_dev->dev,
467324bc 106 &s->dev_tracker);
9fd75b66
DZ		 107 ax25_dev_put(ax25_dev);
108 }
7d8a3a47 109 ax25_cb_del(s);
7ec02f5a 110 release_sock(sk);
ecd2ebde 111 spin_lock_bh(&ax25_list_lock);
4e0f718d 112 sock_put(sk);
ecd2ebde
JP		 113 /* The entry could have been deleted from the
114 * list meanwhile and thus the next pointer is
115 * no longer valid. Play it safe and restart
116 * the scan. Forward progress is ensured
117 * because we set s->ax25_dev to NULL and we
118 * are never passed a NULL 'dev' argument.
119 */
120 goto again;
1da177e4
LT		 121 }
122 }
123 spin_unlock_bh(&ax25_list_lock);
124}
125
126/*
127 * Handle device status changes.
128 */
129static int ax25_device_event(struct notifier_block *this, unsigned long event,
351638e7 130 void *ptr)
1da177e4 131{
351638e7 132 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1da177e4 133
721499e8 134 if (!net_eq(dev_net(dev), &init_net))
e9dc8653
EB		 135 return NOTIFY_DONE;
136
1da177e4
LT		 137 /* Reject non AX.25 devices */
138 if (dev->type != ARPHRD_AX25)
139 return NOTIFY_DONE;
140
141 switch (event) {
142 case NETDEV_UP:
143 ax25_dev_device_up(dev);
144 break;
145 case NETDEV_DOWN:
146 ax25_kill_by_device(dev);
147 ax25_rt_device_down(dev);
148 ax25_dev_device_down(dev);
149 break;
150 default:
151 break;
152 }
153
154 return NOTIFY_DONE;
155}
156
157/*
158 * Add a socket to the bound sockets list.
159 */
160void ax25_cb_add(ax25_cb *ax25)
161{
162 spin_lock_bh(&ax25_list_lock);
163 ax25_cb_hold(ax25);
164 hlist_add_head(&ax25->ax25_node, &ax25_list);
165 spin_unlock_bh(&ax25_list_lock);
166}
167
168/*
169 * Find a socket that wants to accept the SABM we have just
170 * received.
171 */
172struct sock *ax25_find_listener(ax25_address *addr, int digi,
173 struct net_device *dev, int type)
174{
175 ax25_cb *s;
1da177e4 176
c19c4b9c 177 spin_lock(&ax25_list_lock);
b67bfe0d 178 ax25_for_each(s, &ax25_list) {
1da177e4
LT		 179 if ((s->iamdigi && !digi) || (!s->iamdigi && digi))
180 continue;
181 if (s->sk && !ax25cmp(&s->source_addr, addr) &&
182 s->sk->sk_type == type && s->sk->sk_state == TCP_LISTEN) {
183 /* If device is null we match any device */
184 if (s->ax25_dev == NULL || s->ax25_dev->dev == dev) {
185 sock_hold(s->sk);
c19c4b9c 186 spin_unlock(&ax25_list_lock);
1da177e4
LT		 187 return s->sk;
188 }
189 }
190 }
c19c4b9c 191 spin_unlock(&ax25_list_lock);
1da177e4
LT		 192
193 return NULL;
194}
195
196/*
197 * Find an AX.25 socket given both ends.
198 */
199struct sock *ax25_get_socket(ax25_address *my_addr, ax25_address *dest_addr,
200 int type)
201{
202 struct sock *sk = NULL;
203 ax25_cb *s;
1da177e4 204
c19c4b9c 205 spin_lock(&ax25_list_lock);
b67bfe0d 206 ax25_for_each(s, &ax25_list) {
1da177e4
LT		 207 if (s->sk && !ax25cmp(&s->source_addr, my_addr) &&
208 !ax25cmp(&s->dest_addr, dest_addr) &&
209 s->sk->sk_type == type) {
210 sk = s->sk;
211 sock_hold(sk);
212 break;
213 }
214 }
215
c19c4b9c 216 spin_unlock(&ax25_list_lock);
1da177e4
LT		 217
218 return sk;
219}
220
221/*
222 * Find an AX.25 control block given both ends. It will only pick up
223 * floating AX.25 control blocks or non Raw socket bound control blocks.
224 */
c045ad2c 225ax25_cb *ax25_find_cb(const ax25_address *src_addr, ax25_address *dest_addr,
1da177e4
LT		 226 ax25_digi *digi, struct net_device *dev)
227{
228 ax25_cb *s;
1da177e4
LT		 229
230 spin_lock_bh(&ax25_list_lock);
b67bfe0d 231 ax25_for_each(s, &ax25_list) {
1da177e4
LT		 232 if (s->sk && s->sk->sk_type != SOCK_SEQPACKET)
233 continue;
234 if (s->ax25_dev == NULL)
235 continue;
236 if (ax25cmp(&s->source_addr, src_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->ax25_dev->dev == dev) {
237 if (digi != NULL && digi->ndigi != 0) {
238 if (s->digipeat == NULL)
239 continue;
240 if (ax25digicmp(s->digipeat, digi) != 0)
241 continue;
242 } else {
243 if (s->digipeat != NULL && s->digipeat->ndigi != 0)
244 continue;
245 }
246 ax25_cb_hold(s);
247 spin_unlock_bh(&ax25_list_lock);
248
249 return s;
250 }
251 }
252 spin_unlock_bh(&ax25_list_lock);
253
254 return NULL;
255}
256
70868eac
RB		 257EXPORT_SYMBOL(ax25_find_cb);
258
1da177e4
LT		 259void ax25_send_to_raw(ax25_address *addr, struct sk_buff *skb, int proto)
260{
261 ax25_cb *s;
262 struct sk_buff *copy;
1da177e4 263
c19c4b9c 264 spin_lock(&ax25_list_lock);
b67bfe0d 265 ax25_for_each(s, &ax25_list) {
1da177e4
LT		 266 if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 &&
267 s->sk->sk_type == SOCK_RAW &&
268 s->sk->sk_protocol == proto &&
269 s->ax25_dev->dev == skb->dev &&
270 atomic_read(&s->sk->sk_rmem_alloc) <= s->sk->sk_rcvbuf) {
271 if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL)
272 continue;
273 if (sock_queue_rcv_skb(s->sk, copy) != 0)
274 kfree_skb(copy);
275 }
276 }
c19c4b9c 277 spin_unlock(&ax25_list_lock);
1da177e4
LT		 278}
279
280/*
281 * Deferred destroy.
282 */
283void ax25_destroy_socket(ax25_cb *);
284
285/*
286 * Handler for deferred kills.
287 */
8dbd05ff 288static void ax25_destroy_timer(struct timer_list *t)
1da177e4 289{
8dbd05ff 290 ax25_cb *ax25 = from_timer(ax25, t, dtimer);
1da177e4 291 struct sock *sk;
528930b9 292
1da177e4 293 sk=ax25->sk;
528930b9 294
1da177e4
LT		 295 bh_lock_sock(sk);
296 sock_hold(sk);
297 ax25_destroy_socket(ax25);
298 bh_unlock_sock(sk);
299 sock_put(sk);
300}
301
302/*
303 * This is called from user mode and the timers. Thus it protects itself
304 * against interrupt users but doesn't worry about being called during
305 * work. Once it is removed from the queue no interrupt or bottom half
306 * will touch it and we are (fairly 8-) ) safe.
307 */
308void ax25_destroy_socket(ax25_cb *ax25)
309{
310 struct sk_buff *skb;
311
312 ax25_cb_del(ax25);
313
314 ax25_stop_heartbeat(ax25);
315 ax25_stop_t1timer(ax25);
316 ax25_stop_t2timer(ax25);
317 ax25_stop_t3timer(ax25);
318 ax25_stop_idletimer(ax25);
319
320 ax25_clear_queues(ax25); /* Flush the queues */
321
322 if (ax25->sk != NULL) {
323 while ((skb = skb_dequeue(&ax25->sk->sk_receive_queue)) != NULL) {
324 if (skb->sk != ax25->sk) {
325 /* A pending connection */
3200392b 326 ax25_cb *sax25 = sk_to_ax25(skb->sk);
1da177e4
LT		 327
328 /* Queue the unaccepted socket for death */
329 sock_orphan(skb->sk);
330
33d1d2c5
DM		 331 /* 9A4GL: hack to release unaccepted sockets */
332 skb->sk->sk_state = TCP_LISTEN;
333
1da177e4
LT		 334 ax25_start_heartbeat(sax25);
335 sax25->state = AX25_STATE_0;
336 }
337
338 kfree_skb(skb);
339 }
340 skb_queue_purge(&ax25->sk->sk_write_queue);
341 }
342
343 if (ax25->sk != NULL) {
c564039f 344 if (sk_has_allocations(ax25->sk)) {
1da177e4 345 /* Defer: outstanding buffers */
8dbd05ff 346 timer_setup(&ax25->dtimer, ax25_destroy_timer, 0);
1da177e4 347 ax25->dtimer.expires = jiffies + 2 * HZ;
1da177e4
LT		 348 add_timer(&ax25->dtimer);
349 } else {
350 struct sock *sk=ax25->sk;
351 ax25->sk=NULL;
352 sock_put(sk);
353 }
354 } else {
355 ax25_cb_put(ax25);
356 }
357}
358
359/*
360 * dl1bke 960311: set parameters for existing AX.25 connections,
361 * includes a KILL command to abort any connection.
362 * VERY useful for debugging ;-)
363 */
364static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg)
365{
366 struct ax25_ctl_struct ax25_ctl;
367 ax25_digi digi;
368 ax25_dev *ax25_dev;
369 ax25_cb *ax25;
370 unsigned int k;
c0181d42 371 int ret = 0;
1da177e4
LT		 372
373 if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl)))
374 return -EFAULT;
375
1da177e4
LT		 376 if (ax25_ctl.digi_count > AX25_MAX_DIGIS)
377 return -EINVAL;
378
43ab8502 379 if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL)
380 return -EINVAL;
381
87563a04
DZ		 382 ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr);
383 if (!ax25_dev)
384 return -ENODEV;
385
1da177e4
LT		 386 digi.ndigi = ax25_ctl.digi_count;
387 for (k = 0; k < digi.ndigi; k++)
388 digi.calls[k] = ax25_ctl.digi_addr[k];
389
87563a04
DZ		 390 ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev);
391 if (!ax25) {
392 ax25_dev_put(ax25_dev);
1da177e4 393 return -ENOTCONN;
87563a04 394 }
1da177e4
LT		 395
396 switch (ax25_ctl.cmd) {
397 case AX25_KILL:
398 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
399#ifdef CONFIG_AX25_DAMA_SLAVE
400 if (ax25_dev->dama.slave && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE)
401 ax25_dama_off(ax25);
402#endif
403 ax25_disconnect(ax25, ENETRESET);
404 break;
405
528930b9
YH		 406 case AX25_WINDOW:
407 if (ax25->modulus == AX25_MODULUS) {
408 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7)
c0181d42 409 goto einval_put;
528930b9
YH		 410 } else {
411 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63)
c0181d42 412 goto einval_put;
528930b9
YH		 413 }
414 ax25->window = ax25_ctl.arg;
415 break;
416
417 case AX25_T1:
be639ac6 418 if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ)
c0181d42 419 goto einval_put;
528930b9
YH		 420 ax25->rtt = (ax25_ctl.arg * HZ) / 2;
421 ax25->t1 = ax25_ctl.arg * HZ;
422 break;
423
424 case AX25_T2:
be639ac6 425 if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ)
c0181d42 426 goto einval_put;
528930b9
YH		 427 ax25->t2 = ax25_ctl.arg * HZ;
428 break;
429
430 case AX25_N2:
431 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31)
c0181d42 432 goto einval_put;
528930b9
YH		 433 ax25->n2count = 0;
434 ax25->n2 = ax25_ctl.arg;
435 break;
436
437 case AX25_T3:
be639ac6
RB		 438 if (ax25_ctl.arg > ULONG_MAX / HZ)
439 goto einval_put;
528930b9
YH		 440 ax25->t3 = ax25_ctl.arg * HZ;
441 break;
442
443 case AX25_IDLE:
be639ac6
RB		 444 if (ax25_ctl.arg > ULONG_MAX / (60 * HZ))
445 goto einval_put;
446
528930b9
YH		 447 ax25->idle = ax25_ctl.arg * 60 * HZ;
448 break;
449
450 case AX25_PACLEN:
451 if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535)
c0181d42 452 goto einval_put;
528930b9
YH		 453 ax25->paclen = ax25_ctl.arg;
454 break;
455
456 default:
c0181d42 457 goto einval_put;
1da177e4
LT		 458 }
459
c0181d42 460out_put:
d01ffb9e 461 ax25_dev_put(ax25_dev);
c0181d42
JP		 462 ax25_cb_put(ax25);
463 return ret;
464
465einval_put:
466 ret = -EINVAL;
467 goto out_put;
1da177e4
LT		 468}
469
e1fdb5b3
RB		 470static void ax25_fillin_cb_from_dev(ax25_cb *ax25, ax25_dev *ax25_dev)
471{
472 ax25->rtt = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]) / 2;
473 ax25->t1 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]);
474 ax25->t2 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T2]);
475 ax25->t3 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T3]);
476 ax25->n2 = ax25_dev->values[AX25_VALUES_N2];
477 ax25->paclen = ax25_dev->values[AX25_VALUES_PACLEN];
478 ax25->idle = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_IDLE]);
479 ax25->backoff = ax25_dev->values[AX25_VALUES_BACKOFF];
480
481 if (ax25_dev->values[AX25_VALUES_AXDEFMODE]) {
482 ax25->modulus = AX25_EMODULUS;
483 ax25->window = ax25_dev->values[AX25_VALUES_EWINDOW];
484 } else {
485 ax25->modulus = AX25_MODULUS;
486 ax25->window = ax25_dev->values[AX25_VALUES_WINDOW];
487 }
488}
489
1da177e4
LT		 490/*
491 * Fill in a created AX.25 created control block with the default
492 * values for a particular device.
493 */
494void ax25_fillin_cb(ax25_cb *ax25, ax25_dev *ax25_dev)
495{
496 ax25->ax25_dev = ax25_dev;
497
498 if (ax25->ax25_dev != NULL) {
e1fdb5b3
RB		 499 ax25_fillin_cb_from_dev(ax25, ax25_dev);
500 return;
501 }
502
503 /*
504 * No device, use kernel / AX.25 spec default values
505 */
506 ax25->rtt = msecs_to_jiffies(AX25_DEF_T1) / 2;
507 ax25->t1 = msecs_to_jiffies(AX25_DEF_T1);
508 ax25->t2 = msecs_to_jiffies(AX25_DEF_T2);
509 ax25->t3 = msecs_to_jiffies(AX25_DEF_T3);
510 ax25->n2 = AX25_DEF_N2;
511 ax25->paclen = AX25_DEF_PACLEN;
512 ax25->idle = msecs_to_jiffies(AX25_DEF_IDLE);
513 ax25->backoff = AX25_DEF_BACKOFF;
514
515 if (AX25_DEF_AXDEFMODE) {
516 ax25->modulus = AX25_EMODULUS;
517 ax25->window = AX25_DEF_EWINDOW;
1da177e4 518 } else {
e1fdb5b3
RB		 519 ax25->modulus = AX25_MODULUS;
520 ax25->window = AX25_DEF_WINDOW;
1da177e4
LT		 521 }
522}
523
524/*
525 * Create an empty AX.25 control block.
526 */
527ax25_cb *ax25_create_cb(void)
528{
529 ax25_cb *ax25;
530
1b30dd35 531 if ((ax25 = kzalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL)
1da177e4
LT		 532 return NULL;
533
b6d52ede 534 refcount_set(&ax25->refcount, 1);
1da177e4
LT		 535
536 skb_queue_head_init(&ax25->write_queue);
537 skb_queue_head_init(&ax25->frag_queue);
538 skb_queue_head_init(&ax25->ack_queue);
539 skb_queue_head_init(&ax25->reseq_queue);
540
21fab4a8 541 ax25_setup_timers(ax25);
1da177e4
LT		 542
543 ax25_fillin_cb(ax25, NULL);
544
545 ax25->state = AX25_STATE_0;
546
547 return ax25;
548}
549
550/*
551 * Handling for system calls applied via the various interfaces to an
552 * AX25 socket object
553 */
554
555static int ax25_setsockopt(struct socket *sock, int level, int optname,
a7b75c5a 556 sockptr_t optval, unsigned int optlen)
1da177e4
LT		 557{
558 struct sock *sk = sock->sk;
559 ax25_cb *ax25;
560 struct net_device *dev;
561 char devname[IFNAMSIZ];
93719370 562 unsigned int opt;
ba1cffe0 563 int res = 0;
1da177e4
LT		 564
565 if (level != SOL_AX25)
566 return -ENOPROTOOPT;
567
ba1cffe0 568 if (optlen < sizeof(unsigned int))
1da177e4
LT		 569 return -EINVAL;
570
a7b75c5a 571 if (copy_from_sockptr(&opt, optval, sizeof(unsigned int)))
1da177e4
LT		 572 return -EFAULT;
573
574 lock_sock(sk);
3200392b 575 ax25 = sk_to_ax25(sk);
1da177e4
LT		 576
577 switch (optname) {
578 case AX25_WINDOW:
579 if (ax25->modulus == AX25_MODULUS) {
580 if (opt < 1 || opt > 7) {
581 res = -EINVAL;
582 break;
583 }
584 } else {
585 if (opt < 1 || opt > 63) {
586 res = -EINVAL;
587 break;
588 }
589 }
590 ax25->window = opt;
591 break;
592
593 case AX25_T1:
93719370 594 if (opt < 1 || opt > UINT_MAX / HZ) {
1da177e4
LT		 595 res = -EINVAL;
596 break;
597 }
f16f3026 598 ax25->rtt = (opt * HZ) >> 1;
1da177e4
LT		 599 ax25->t1 = opt * HZ;
600 break;
601
602 case AX25_T2:
93719370 603 if (opt < 1 || opt > UINT_MAX / HZ) {
1da177e4
LT		 604 res = -EINVAL;
605 break;
606 }
607 ax25->t2 = opt * HZ;
608 break;
609
610 case AX25_N2:
611 if (opt < 1 || opt > 31) {
612 res = -EINVAL;
613 break;
614 }
615 ax25->n2 = opt;
616 break;
617
618 case AX25_T3:
93719370 619 if (opt < 1 || opt > UINT_MAX / HZ) {
1da177e4
LT		 620 res = -EINVAL;
621 break;
622 }
623 ax25->t3 = opt * HZ;
624 break;
625
626 case AX25_IDLE:
93719370 627 if (opt > UINT_MAX / (60 * HZ)) {
1da177e4
LT		 628 res = -EINVAL;
629 break;
630 }
631 ax25->idle = opt * 60 * HZ;
632 break;
633
634 case AX25_BACKOFF:
ba1cffe0 635 if (opt > 2) {
1da177e4
LT		 636 res = -EINVAL;
637 break;
638 }
639 ax25->backoff = opt;
640 break;
641
642 case AX25_EXTSEQ:
643 ax25->modulus = opt ? AX25_EMODULUS : AX25_MODULUS;
644 break;
645
646 case AX25_PIDINCL:
647 ax25->pidincl = opt ? 1 : 0;
648 break;
649
650 case AX25_IAMDIGI:
651 ax25->iamdigi = opt ? 1 : 0;
652 break;
653
654 case AX25_PACLEN:
655 if (opt < 16 || opt > 65535) {
656 res = -EINVAL;
657 break;
658 }
659 ax25->paclen = opt;
660 break;
661
662 case SO_BINDTODEVICE:
687775ce
ED		 663 if (optlen > IFNAMSIZ - 1)
664 optlen = IFNAMSIZ - 1;
665
666 memset(devname, 0, sizeof(devname));
1da177e4 667
a7b75c5a 668 if (copy_from_sockptr(devname, optval, optlen)) {
2f72291d 669 res = -EFAULT;
1da177e4
LT		 670 break;
671 }
672
673 if (sk->sk_type == SOCK_SEQPACKET &&
674 (sock->state != SS_UNCONNECTED ||
675 sk->sk_state == TCP_LISTEN)) {
676 res = -EADDRNOTAVAIL;
2f72291d
RB		 677 break;
678 }
679
c4335704
CW		 680 rtnl_lock();
681 dev = __dev_get_by_name(&init_net, devname);
2f72291d 682 if (!dev) {
c4335704 683 rtnl_unlock();
2f72291d 684 res = -ENODEV;
1da177e4
LT		 685 break;
686 }
687
688 ax25->ax25_dev = ax25_dev_ax25dev(dev);
c4335704
CW		 689 if (!ax25->ax25_dev) {
690 rtnl_unlock();
691 res = -ENODEV;
692 break;
693 }
1da177e4 694 ax25_fillin_cb(ax25, ax25->ax25_dev);
c4335704 695 rtnl_unlock();
1da177e4
LT		 696 break;
697
698 default:
699 res = -ENOPROTOOPT;
700 }
701 release_sock(sk);
702
703 return res;
704}
705
706static int ax25_getsockopt(struct socket *sock, int level, int optname,
707 char __user *optval, int __user *optlen)
708{
709 struct sock *sk = sock->sk;
710 ax25_cb *ax25;
711 struct ax25_dev *ax25_dev;
712 char devname[IFNAMSIZ];
713 void *valptr;
714 int val = 0;
715 int maxlen, length;
716
717 if (level != SOL_AX25)
718 return -ENOPROTOOPT;
719
720 if (get_user(maxlen, optlen))
721 return -EFAULT;
722
723 if (maxlen < 1)
724 return -EFAULT;
725
1d7322f2 726 valptr = &val;
1da177e4
LT		 727 length = min_t(unsigned int, maxlen, sizeof(int));
728
729 lock_sock(sk);
3200392b 730 ax25 = sk_to_ax25(sk);
1da177e4
LT		 731
732 switch (optname) {
733 case AX25_WINDOW:
734 val = ax25->window;
735 break;
736
737 case AX25_T1:
738 val = ax25->t1 / HZ;
739 break;
740
741 case AX25_T2:
742 val = ax25->t2 / HZ;
743 break;
744
745 case AX25_N2:
746 val = ax25->n2;
747 break;
748
749 case AX25_T3:
750 val = ax25->t3 / HZ;
751 break;
752
753 case AX25_IDLE:
754 val = ax25->idle / (60 * HZ);
755 break;
756
757 case AX25_BACKOFF:
758 val = ax25->backoff;
759 break;
760
761 case AX25_EXTSEQ:
762 val = (ax25->modulus == AX25_EMODULUS);
763 break;
764
765 case AX25_PIDINCL:
766 val = ax25->pidincl;
767 break;
768
769 case AX25_IAMDIGI:
770 val = ax25->iamdigi;
771 break;
772
773 case AX25_PACLEN:
774 val = ax25->paclen;
775 break;
776
777 case SO_BINDTODEVICE:
778 ax25_dev = ax25->ax25_dev;
779
780 if (ax25_dev != NULL && ax25_dev->dev != NULL) {
6164b5e3 781 strscpy(devname, ax25_dev->dev->name, sizeof(devname));
1da177e4
LT		 782 length = strlen(devname) + 1;
783 } else {
784 *devname = '\0';
785 length = 1;
786 }
787
1d7322f2 788 valptr = devname;
1da177e4
LT		 789 break;
790
791 default:
792 release_sock(sk);
793 return -ENOPROTOOPT;
794 }
795 release_sock(sk);
796
797 if (put_user(length, optlen))
798 return -EFAULT;
799
800 return copy_to_user(optval, valptr, length) ? -EFAULT : 0;
801}
802
803static int ax25_listen(struct socket *sock, int backlog)
804{
805 struct sock *sk = sock->sk;
806 int res = 0;
807
808 lock_sock(sk);
809 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_LISTEN) {
810 sk->sk_max_ack_backlog = backlog;
811 sk->sk_state = TCP_LISTEN;
812 goto out;
813 }
814 res = -EOPNOTSUPP;
815
816out:
817 release_sock(sk);
818
819 return res;
820}
821
822/*
823 * XXX: when creating ax25_sock we should update the .obj_size setting
824 * below.
825 */
826static struct proto ax25_proto = {
827 .name = "AX25",
828 .owner = THIS_MODULE,
3200392b 829 .obj_size = sizeof(struct ax25_sock),
1da177e4
LT		 830};
831
3f378b68
EP		 832static int ax25_create(struct net *net, struct socket *sock, int protocol,
833 int kern)
1da177e4
LT		 834{
835 struct sock *sk;
836 ax25_cb *ax25;
837
e9cdced7 838 if (protocol < 0 || protocol > U8_MAX)
79462ad0
HFS		 839 return -EINVAL;
840
09ad9bc7 841 if (!net_eq(net, &init_net))
1b8d7ae4
EB		 842 return -EAFNOSUPPORT;
843
1da177e4
LT		 844 switch (sock->type) {
845 case SOCK_DGRAM:
846 if (protocol == 0 || protocol == PF_AX25)
847 protocol = AX25_P_TEXT;
848 break;
849
850 case SOCK_SEQPACKET:
851 switch (protocol) {
852 case 0:
853 case PF_AX25: /* For CLX */
854 protocol = AX25_P_TEXT;
855 break;
856 case AX25_P_SEGMENT:
857#ifdef CONFIG_INET
858 case AX25_P_ARP:
859 case AX25_P_IP:
860#endif
861#ifdef CONFIG_NETROM
862 case AX25_P_NETROM:
863#endif
864#ifdef CONFIG_ROSE
865 case AX25_P_ROSE:
866#endif
867 return -ESOCKTNOSUPPORT;
868#ifdef CONFIG_NETROM_MODULE
869 case AX25_P_NETROM:
870 if (ax25_protocol_is_registered(AX25_P_NETROM))
871 return -ESOCKTNOSUPPORT;
ef764a13 872 break;
1da177e4
LT		 873#endif
874#ifdef CONFIG_ROSE_MODULE
875 case AX25_P_ROSE:
876 if (ax25_protocol_is_registered(AX25_P_ROSE))
877 return -ESOCKTNOSUPPORT;
5646fba6 878 break;
1da177e4
LT		 879#endif
880 default:
881 break;
882 }
883 break;
884
885 case SOCK_RAW:
0614e2b7
ON		 886 if (!capable(CAP_NET_RAW))
887 return -EPERM;
1da177e4
LT		 888 break;
889 default:
890 return -ESOCKTNOSUPPORT;
891 }
892
11aa9c28 893 sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto, kern);
6257ff21 894 if (sk == NULL)
1da177e4
LT		 895 return -ENOMEM;
896
3200392b 897 ax25 = ax25_sk(sk)->cb = ax25_create_cb();
1da177e4
LT		 898 if (!ax25) {
899 sk_free(sk);
900 return -ENOMEM;
901 }
902
903 sock_init_data(sock, sk);
904
905 sk->sk_destruct = ax25_free_sock;
906 sock->ops = &ax25_proto_ops;
907 sk->sk_protocol = protocol;
908
909 ax25->sk = sk;
910
911 return 0;
912}
913
914struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev)
915{
916 struct sock *sk;
917 ax25_cb *ax25, *oax25;
918
11aa9c28 919 sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot, 0);
6257ff21 920 if (sk == NULL)
1da177e4
LT		 921 return NULL;
922
923 if ((ax25 = ax25_create_cb()) == NULL) {
924 sk_free(sk);
925 return NULL;
926 }
927
928 switch (osk->sk_type) {
929 case SOCK_DGRAM:
930 break;
931 case SOCK_SEQPACKET:
932 break;
933 default:
934 sk_free(sk);
935 ax25_cb_put(ax25);
936 return NULL;
937 }
938
939 sock_init_data(NULL, sk);
940
1da177e4 941 sk->sk_type = osk->sk_type;
10bbf165 942 sk->sk_priority = READ_ONCE(osk->sk_priority);
1da177e4
LT		 943 sk->sk_protocol = osk->sk_protocol;
944 sk->sk_rcvbuf = osk->sk_rcvbuf;
945 sk->sk_sndbuf = osk->sk_sndbuf;
946 sk->sk_state = TCP_ESTABLISHED;
53b924b3 947 sock_copy_flags(sk, osk);
1da177e4 948
3200392b 949 oax25 = sk_to_ax25(osk);
1da177e4
LT		 950
951 ax25->modulus = oax25->modulus;
952 ax25->backoff = oax25->backoff;
953 ax25->pidincl = oax25->pidincl;
954 ax25->iamdigi = oax25->iamdigi;
955 ax25->rtt = oax25->rtt;
956 ax25->t1 = oax25->t1;
957 ax25->t2 = oax25->t2;
958 ax25->t3 = oax25->t3;
959 ax25->n2 = oax25->n2;
960 ax25->idle = oax25->idle;
961 ax25->paclen = oax25->paclen;
962 ax25->window = oax25->window;
963
964 ax25->ax25_dev = ax25_dev;
965 ax25->source_addr = oax25->source_addr;
966
967 if (oax25->digipeat != NULL) {
0459d70a
ACM		 968 ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi),
969 GFP_ATOMIC);
970 if (ax25->digipeat == NULL) {
1da177e4
LT		 971 sk_free(sk);
972 ax25_cb_put(ax25);
973 return NULL;
974 }
1da177e4
LT		 975 }
976
3200392b 977 ax25_sk(sk)->cb = ax25;
8c185ab6 978 sk->sk_destruct = ax25_free_sock;
1da177e4
LT		 979 ax25->sk = sk;
980
981 return sk;
982}
983
984static int ax25_release(struct socket *sock)
985{
986 struct sock *sk = sock->sk;
987 ax25_cb *ax25;
9fd75b66 988 ax25_dev *ax25_dev;
1da177e4
LT		 989
990 if (sk == NULL)
991 return 0;
992
993 sock_hold(sk);
1da177e4 994 lock_sock(sk);
9fd75b66 995 sock_orphan(sk);
3200392b 996 ax25 = sk_to_ax25(sk);
9fd75b66 997 ax25_dev = ax25->ax25_dev;
1da177e4
LT		 998
999 if (sk->sk_type == SOCK_SEQPACKET) {
1000 switch (ax25->state) {
1001 case AX25_STATE_0:
7d8a3a47
DZ		 1002 if (!sock_flag(ax25->sk, SOCK_DEAD)) {
1003 release_sock(sk);
1004 ax25_disconnect(ax25, 0);
1005 lock_sock(sk);
1006 }
1da177e4
LT		 1007 ax25_destroy_socket(ax25);
1008 break;
1009
1010 case AX25_STATE_1:
1011 case AX25_STATE_2:
1012 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
1013 release_sock(sk);
1014 ax25_disconnect(ax25, 0);
1015 lock_sock(sk);
4a7d99ea
BG		 1016 if (!sock_flag(ax25->sk, SOCK_DESTROY))
1017 ax25_destroy_socket(ax25);
1da177e4
LT		 1018 break;
1019
1020 case AX25_STATE_3:
1021 case AX25_STATE_4:
1022 ax25_clear_queues(ax25);
1023 ax25->n2count = 0;
1024
1025 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
1026 case AX25_PROTO_STD_SIMPLEX:
1027 case AX25_PROTO_STD_DUPLEX:
1028 ax25_send_control(ax25,
1029 AX25_DISC,
1030 AX25_POLLON,
1031 AX25_COMMAND);
1032 ax25_stop_t2timer(ax25);
1033 ax25_stop_t3timer(ax25);
1034 ax25_stop_idletimer(ax25);
1035 break;
1036#ifdef CONFIG_AX25_DAMA_SLAVE
1037 case AX25_PROTO_DAMA_SLAVE:
1038 ax25_stop_t3timer(ax25);
1039 ax25_stop_idletimer(ax25);
1040 break;
1041#endif
1042 }
1043 ax25_calculate_t1(ax25);
1044 ax25_start_t1timer(ax25);
1045 ax25->state = AX25_STATE_2;
1046 sk->sk_state = TCP_CLOSE;
1047 sk->sk_shutdown |= SEND_SHUTDOWN;
1048 sk->sk_state_change(sk);
1049 sock_set_flag(sk, SOCK_DESTROY);
1050 break;
1051
1052 default:
1053 break;
1054 }
1055 } else {
1056 sk->sk_state = TCP_CLOSE;
1057 sk->sk_shutdown |= SEND_SHUTDOWN;
1058 sk->sk_state_change(sk);
1059 ax25_destroy_socket(ax25);
1060 }
5352a761 1061 if (ax25_dev) {
7d8a3a47
DZ		 1062 if (!ax25_dev->device_up) {
1063 del_timer_sync(&ax25->timer);
1064 del_timer_sync(&ax25->t1timer);
1065 del_timer_sync(&ax25->t2timer);
1066 del_timer_sync(&ax25->t3timer);
1067 del_timer_sync(&ax25->idletimer);
1068 }
7c6327c7 1069 netdev_put(ax25_dev->dev, &ax25->dev_tracker);
5352a761
DZ		 1070 ax25_dev_put(ax25_dev);
1071 }
1da177e4
LT		 1072
1073 sock->sk = NULL;
1074 release_sock(sk);
1075 sock_put(sk);
1076
1077 return 0;
1078}
1079
1080/*
1081 * We support a funny extension here so you can (as root) give any callsign
1082 * digipeated via a local address as source. This hack is obsolete now
1083 * that we've implemented support for SO_BINDTODEVICE. It is however small
1084 * and trivially backward compatible.
1085 */
1086static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1087{
1088 struct sock *sk = sock->sk;
1089 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
1090 ax25_dev *ax25_dev = NULL;
01d7dd0e
RB		 1091 ax25_uid_assoc *user;
1092 ax25_address call;
1da177e4
LT		 1093 ax25_cb *ax25;
1094 int err = 0;
1095
1096 if (addr_len != sizeof(struct sockaddr_ax25) &&
1987e7b4 1097 addr_len != sizeof(struct full_sockaddr_ax25))
1098 /* support for old structure may go away some time
1099 * ax25_bind(): uses old (6 digipeater) socket structure.
1100 */
1da177e4 1101 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1987e7b4 1102 (addr_len > sizeof(struct full_sockaddr_ax25)))
1da177e4 1103 return -EINVAL;
1da177e4
LT		 1104
1105 if (addr->fsa_ax25.sax25_family != AF_AX25)
1106 return -EINVAL;
1107
73400407 1108 user = ax25_findbyuid(current_euid());
01d7dd0e
RB		 1109 if (user) {
1110 call = user->call;
1111 ax25_uid_put(user);
1112 } else {
1113 if (ax25_uid_policy && !capable(CAP_NET_ADMIN))
1114 return -EACCES;
1115
1116 call = addr->fsa_ax25.sax25_call;
1da177e4
LT		 1117 }
1118
1119 lock_sock(sk);
1120
3200392b 1121 ax25 = sk_to_ax25(sk);
1da177e4
LT		 1122 if (!sock_flag(sk, SOCK_ZAPPED)) {
1123 err = -EINVAL;
1124 goto out;
1125 }
1126
01d7dd0e 1127 ax25->source_addr = call;
1da177e4
LT		 1128
1129 /*
1130 * User already set interface with SO_BINDTODEVICE
1131 */
1132 if (ax25->ax25_dev != NULL)
1133 goto done;
1134
1135 if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) {
1136 if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 &&
1137 (ax25_dev = ax25_addr_ax25dev(&addr->fsa_digipeater[0])) == NULL) {
1138 err = -EADDRNOTAVAIL;
1139 goto out;
1140 }
1141 } else {
1142 if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) {
1143 err = -EADDRNOTAVAIL;
1144 goto out;
1145 }
1146 }
1147
feef318c 1148 if (ax25_dev) {
1da177e4 1149 ax25_fillin_cb(ax25, ax25_dev);
7c6327c7 1150 netdev_hold(ax25_dev->dev, &ax25->dev_tracker, GFP_ATOMIC);
feef318c 1151 }
1da177e4
LT		 1152
1153done:
1154 ax25_cb_add(ax25);
1155 sock_reset_flag(sk, SOCK_ZAPPED);
1156
1157out:
1158 release_sock(sk);
1159
49339cca 1160 return err;
1da177e4
LT		 1161}
1162
1163/*
1164 * FIXME: nonblock behaviour looks like it may have a bug.
1165 */
c9266b99
RB		 1166static int __must_check ax25_connect(struct socket *sock,
1167 struct sockaddr *uaddr, int addr_len, int flags)
1da177e4
LT		 1168{
1169 struct sock *sk = sock->sk;
3200392b 1170 ax25_cb *ax25 = sk_to_ax25(sk), *ax25t;
1da177e4
LT		 1171 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1172 ax25_digi *digi = NULL;
1173 int ct = 0, err = 0;
1174
1175 /*
1176 * some sanity checks. code further down depends on this
1177 */
1178
27d1cba2 1179 if (addr_len == sizeof(struct sockaddr_ax25))
1180 /* support for this will go away in early 2.5.x
1181 * ax25_connect(): uses obsolete socket structure
1182 */
1183 ;
1184 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1185 /* support for old structure may go away some time
1186 * ax25_connect(): uses old (6 digipeater) socket structure.
1187 */
1da177e4 1188 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
27d1cba2 1189 (addr_len > sizeof(struct full_sockaddr_ax25)))
1da177e4 1190 return -EINVAL;
1da177e4 1191
1da177e4
LT		 1192
1193 if (fsa->fsa_ax25.sax25_family != AF_AX25)
1194 return -EINVAL;
1195
1196 lock_sock(sk);
1197
1198 /* deal with restarts */
1199 if (sock->state == SS_CONNECTING) {
1200 switch (sk->sk_state) {
1201 case TCP_SYN_SENT: /* still trying */
1202 err = -EINPROGRESS;
75606dc6 1203 goto out_release;
1da177e4
LT		 1204
1205 case TCP_ESTABLISHED: /* connection established */
1206 sock->state = SS_CONNECTED;
75606dc6 1207 goto out_release;
1da177e4
LT		 1208
1209 case TCP_CLOSE: /* connection refused */
1210 sock->state = SS_UNCONNECTED;
1211 err = -ECONNREFUSED;
75606dc6 1212 goto out_release;
1da177e4
LT		 1213 }
1214 }
1215
1216 if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) {
1217 err = -EISCONN; /* No reconnect on a seqpacket socket */
75606dc6 1218 goto out_release;
1da177e4
LT		 1219 }
1220
1221 sk->sk_state = TCP_CLOSE;
1222 sock->state = SS_UNCONNECTED;
1223
a51482bd
JJ		 1224 kfree(ax25->digipeat);
1225 ax25->digipeat = NULL;
1da177e4
LT		 1226
1227 /*
1228 * Handle digi-peaters to be used.
1229 */
1230 if (addr_len > sizeof(struct sockaddr_ax25) &&
1231 fsa->fsa_ax25.sax25_ndigis != 0) {
1232 /* Valid number of digipeaters ? */
2f2a7ffa 1233 if (fsa->fsa_ax25.sax25_ndigis < 1 ||
17ad73e9 1234 fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS ||
2f2a7ffa
PY		 1235 addr_len < sizeof(struct sockaddr_ax25) +
1236 sizeof(ax25_address) * fsa->fsa_ax25.sax25_ndigis) {
1da177e4 1237 err = -EINVAL;
75606dc6 1238 goto out_release;
1da177e4
LT		 1239 }
1240
1241 if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
1242 err = -ENOBUFS;
75606dc6 1243 goto out_release;
1da177e4
LT		 1244 }
1245
1246 digi->ndigi = fsa->fsa_ax25.sax25_ndigis;
1247 digi->lastrepeat = -1;
1248
1249 while (ct < fsa->fsa_ax25.sax25_ndigis) {
1250 if ((fsa->fsa_digipeater[ct].ax25_call[6] &
1251 AX25_HBIT) && ax25->iamdigi) {
1252 digi->repeated[ct] = 1;
1253 digi->lastrepeat = ct;
1254 } else {
1255 digi->repeated[ct] = 0;
1256 }
1257 digi->calls[ct] = fsa->fsa_digipeater[ct];
1258 ct++;
1259 }
1260 }
1261
1262 /*
1263 * Must bind first - autobinding in this may or may not work. If
1264 * the socket is already bound, check to see if the device has
1265 * been filled in, error if it hasn't.
1266 */
1267 if (sock_flag(sk, SOCK_ZAPPED)) {
1268 /* check if we can remove this feature. It is broken. */
1269 printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n",
1270 current->comm);
1271 if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) {
1272 kfree(digi);
75606dc6 1273 goto out_release;
1da177e4
LT		 1274 }
1275
1276 ax25_fillin_cb(ax25, ax25->ax25_dev);
1277 ax25_cb_add(ax25);
1278 } else {
1279 if (ax25->ax25_dev == NULL) {
1280 kfree(digi);
1281 err = -EHOSTUNREACH;
75606dc6 1282 goto out_release;
1da177e4
LT		 1283 }
1284 }
1285
1286 if (sk->sk_type == SOCK_SEQPACKET &&
1287 (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi,
528930b9 1288 ax25->ax25_dev->dev))) {
1da177e4
LT		 1289 kfree(digi);
1290 err = -EADDRINUSE; /* Already such a connection */
1291 ax25_cb_put(ax25t);
75606dc6 1292 goto out_release;
1da177e4
LT		 1293 }
1294
1295 ax25->dest_addr = fsa->fsa_ax25.sax25_call;
1296 ax25->digipeat = digi;
1297
1298 /* First the easy one */
1299 if (sk->sk_type != SOCK_SEQPACKET) {
1300 sock->state = SS_CONNECTED;
1301 sk->sk_state = TCP_ESTABLISHED;
75606dc6 1302 goto out_release;
1da177e4
LT		 1303 }
1304
1305 /* Move to connecting socket, ax.25 lapb WAIT_UA.. */
1306 sock->state = SS_CONNECTING;
1307 sk->sk_state = TCP_SYN_SENT;
1308
1309 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
1310 case AX25_PROTO_STD_SIMPLEX:
1311 case AX25_PROTO_STD_DUPLEX:
1312 ax25_std_establish_data_link(ax25);
1313 break;
1314
1315#ifdef CONFIG_AX25_DAMA_SLAVE
1316 case AX25_PROTO_DAMA_SLAVE:
1317 ax25->modulus = AX25_MODULUS;
1318 ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
1319 if (ax25->ax25_dev->dama.slave)
1320 ax25_ds_establish_data_link(ax25);
1321 else
1322 ax25_std_establish_data_link(ax25);
1323 break;
1324#endif
1325 }
1326
1327 ax25->state = AX25_STATE_1;
1328
1329 ax25_start_heartbeat(ax25);
1330
1331 /* Now the loop */
1332 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
1333 err = -EINPROGRESS;
75606dc6 1334 goto out_release;
1da177e4
LT		 1335 }
1336
1337 if (sk->sk_state == TCP_SYN_SENT) {
75606dc6 1338 DEFINE_WAIT(wait);
1da177e4 1339
1da177e4 1340 for (;;) {
aa395145 1341 prepare_to_wait(sk_sleep(sk), &wait,
bd3b071b 1342 TASK_INTERRUPTIBLE);
1da177e4
LT		 1343 if (sk->sk_state != TCP_SYN_SENT)
1344 break;
75606dc6
RB		 1345 if (!signal_pending(current)) {
1346 release_sock(sk);
1da177e4
LT		 1347 schedule();
1348 lock_sock(sk);
1349 continue;
1350 }
75606dc6
RB		 1351 err = -ERESTARTSYS;
1352 break;
1da177e4 1353 }
aa395145 1354 finish_wait(sk_sleep(sk), &wait);
75606dc6
RB		 1355
1356 if (err)
1357 goto out_release;
1da177e4
LT		 1358 }
1359
1360 if (sk->sk_state != TCP_ESTABLISHED) {
1361 /* Not in ABM, not in WAIT_UA -> failed */
1362 sock->state = SS_UNCONNECTED;
1363 err = sock_error(sk); /* Always set at this point */
75606dc6 1364 goto out_release;
1da177e4
LT		 1365 }
1366
1367 sock->state = SS_CONNECTED;
1368
75606dc6
RB		 1369 err = 0;
1370out_release:
1da177e4
LT		 1371 release_sock(sk);
1372
1373 return err;
1374}
1375
cdfbabfb
DH		 1376static int ax25_accept(struct socket *sock, struct socket *newsock, int flags,
1377 bool kern)
1da177e4 1378{
1da177e4
LT		 1379 struct sk_buff *skb;
1380 struct sock *newsk;
75606dc6 1381 DEFINE_WAIT(wait);
1da177e4
LT		 1382 struct sock *sk;
1383 int err = 0;
1384
1385 if (sock->state != SS_UNCONNECTED)
1386 return -EINVAL;
1387
1388 if ((sk = sock->sk) == NULL)
1389 return -EINVAL;
1390
1391 lock_sock(sk);
1392 if (sk->sk_type != SOCK_SEQPACKET) {
1393 err = -EOPNOTSUPP;
1394 goto out;
1395 }
1396
1397 if (sk->sk_state != TCP_LISTEN) {
1398 err = -EINVAL;
1399 goto out;
1400 }
1401
1402 /*
1403 * The read queue this time is holding sockets ready to use
1404 * hooked into the SABM we saved
1405 */
1da177e4 1406 for (;;) {
aa395145 1407 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1408 skb = skb_dequeue(&sk->sk_receive_queue);
1409 if (skb)
1410 break;
1411
1da177e4 1412 if (flags & O_NONBLOCK) {
75606dc6
RB		 1413 err = -EWOULDBLOCK;
1414 break;
1da177e4 1415 }
75606dc6
RB		 1416 if (!signal_pending(current)) {
1417 release_sock(sk);
1da177e4
LT		 1418 schedule();
1419 lock_sock(sk);
1420 continue;
1421 }
75606dc6
RB		 1422 err = -ERESTARTSYS;
1423 break;
1da177e4 1424 }
aa395145 1425 finish_wait(sk_sleep(sk), &wait);
75606dc6
RB		 1426
1427 if (err)
1428 goto out;
1da177e4
LT		 1429
1430 newsk = skb->sk;
9375cb8a 1431 sock_graft(newsk, newsock);
1da177e4
LT		 1432
1433 /* Now attach up the new socket */
1434 kfree_skb(skb);
7976a11b 1435 sk_acceptq_removed(sk);
1da177e4
LT		 1436 newsock->state = SS_CONNECTED;
1437
1438out:
1439 release_sock(sk);
1440
1441 return err;
1442}
1443
1444static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
9b2c45d4 1445 int peer)
1da177e4
LT		 1446{
1447 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1448 struct sock *sk = sock->sk;
1449 unsigned char ndigi, i;
1450 ax25_cb *ax25;
1451 int err = 0;
1452
5b919f83 1453 memset(fsa, 0, sizeof(*fsa));
1da177e4 1454 lock_sock(sk);
3200392b 1455 ax25 = sk_to_ax25(sk);
1da177e4
LT		 1456
1457 if (peer != 0) {
1458 if (sk->sk_state != TCP_ESTABLISHED) {
1459 err = -ENOTCONN;
1460 goto out;
1461 }
1462
1463 fsa->fsa_ax25.sax25_family = AF_AX25;
1464 fsa->fsa_ax25.sax25_call = ax25->dest_addr;
1da177e4
LT		 1465
1466 if (ax25->digipeat != NULL) {
1467 ndigi = ax25->digipeat->ndigi;
1468 fsa->fsa_ax25.sax25_ndigis = ndigi;
1469 for (i = 0; i < ndigi; i++)
1470 fsa->fsa_digipeater[i] =
1471 ax25->digipeat->calls[i];
1472 }
1473 } else {
1474 fsa->fsa_ax25.sax25_family = AF_AX25;
1475 fsa->fsa_ax25.sax25_call = ax25->source_addr;
1476 fsa->fsa_ax25.sax25_ndigis = 1;
1477 if (ax25->ax25_dev != NULL) {
1478 memcpy(&fsa->fsa_digipeater[0],
1479 ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN);
1480 } else {
1481 fsa->fsa_digipeater[0] = null_ax25_address;
1482 }
1483 }
9b2c45d4 1484 err = sizeof (struct full_sockaddr_ax25);
1da177e4
LT		 1485
1486out:
1487 release_sock(sk);
1488
1489 return err;
1490}
1491
1b784140 1492static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1da177e4 1493{
342dfc30 1494 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1da177e4
LT		 1495 struct sock *sk = sock->sk;
1496 struct sockaddr_ax25 sax;
1497 struct sk_buff *skb;
1498 ax25_digi dtmp, *dp;
1da177e4
LT		 1499 ax25_cb *ax25;
1500 size_t size;
1501 int lv, err, addr_len = msg->msg_namelen;
1502
1503 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1504 return -EINVAL;
1505
1506 lock_sock(sk);
3200392b 1507 ax25 = sk_to_ax25(sk);
1da177e4
LT		 1508
1509 if (sock_flag(sk, SOCK_ZAPPED)) {
1510 err = -EADDRNOTAVAIL;
1511 goto out;
1512 }
1513
1514 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1515 send_sig(SIGPIPE, current, 0);
1516 err = -EPIPE;
1517 goto out;
1518 }
1519
1520 if (ax25->ax25_dev == NULL) {
1521 err = -ENETUNREACH;
1522 goto out;
1523 }
1524
1525 if (len > ax25->ax25_dev->dev->mtu) {
1526 err = -EMSGSIZE;
1527 goto out;
1528 }
528930b9 1529
1da177e4
LT		 1530 if (usax != NULL) {
1531 if (usax->sax25_family != AF_AX25) {
1532 err = -EINVAL;
1533 goto out;
1534 }
1535
27d1cba2 1536 if (addr_len == sizeof(struct sockaddr_ax25))
1537 /* ax25_sendmsg(): uses obsolete socket structure */
1538 ;
1539 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1540 /* support for old structure may go away some time
1541 * ax25_sendmsg(): uses old (6 digipeater)
1542 * socket structure.
1543 */
1da177e4 1544 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
528930b9
YH		 1545 (addr_len > sizeof(struct full_sockaddr_ax25))) {
1546 err = -EINVAL;
1da177e4
LT		 1547 goto out;
1548 }
1549
1da177e4
LT		 1550
1551 if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) {
1552 int ct = 0;
1553 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax;
1554
1555 /* Valid number of digipeaters ? */
17ad73e9
DC		 1556 if (usax->sax25_ndigis < 1 ||
1557 usax->sax25_ndigis > AX25_MAX_DIGIS ||
1558 addr_len < sizeof(struct sockaddr_ax25) +
8885bb06 1559 sizeof(ax25_address) * usax->sax25_ndigis) {
1da177e4
LT		 1560 err = -EINVAL;
1561 goto out;
1562 }
1563
1564 dtmp.ndigi = usax->sax25_ndigis;
1565
1566 while (ct < usax->sax25_ndigis) {
1567 dtmp.repeated[ct] = 0;
1568 dtmp.calls[ct] = fsa->fsa_digipeater[ct];
1569 ct++;
1570 }
1571
1572 dtmp.lastrepeat = 0;
1573 }
1574
1575 sax = *usax;
1576 if (sk->sk_type == SOCK_SEQPACKET &&
1577 ax25cmp(&ax25->dest_addr, &sax.sax25_call)) {
1578 err = -EISCONN;
1579 goto out;
1580 }
1581 if (usax->sax25_ndigis == 0)
1582 dp = NULL;
1583 else
1584 dp = &dtmp;
1585 } else {
1586 /*
1587 * FIXME: 1003.1g - if the socket is like this because
1588 * it has become closed (not started closed) and is VC
1589 * we ought to SIGPIPE, EPIPE
1590 */
1591 if (sk->sk_state != TCP_ESTABLISHED) {
1592 err = -ENOTCONN;
1593 goto out;
1594 }
1595 sax.sax25_family = AF_AX25;
1596 sax.sax25_call = ax25->dest_addr;
1597 dp = ax25->digipeat;
1598 }
1599
1da177e4 1600 /* Build a packet */
1da177e4
LT		 1601 /* Assume the worst case */
1602 size = len + ax25->ax25_dev->dev->hard_header_len;
1603
1604 skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err);
1605 if (skb == NULL)
1606 goto out;
1607
1608 skb_reserve(skb, size - len);
1609
1da177e4 1610 /* User data follows immediately after the AX.25 data */
6ce8e9ce 1611 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1da177e4
LT		 1612 err = -EFAULT;
1613 kfree_skb(skb);
1614 goto out;
1615 }
1616
c1d2bbe1 1617 skb_reset_network_header(skb);
1da177e4
LT		 1618
1619 /* Add the PID if one is not supplied by the user in the skb */
967b05f6 1620 if (!ax25->pidincl)
d58ff351 1621 *(u8 *)skb_push(skb, 1) = sk->sk_protocol;
1da177e4 1622
1da177e4
LT		 1623 if (sk->sk_type == SOCK_SEQPACKET) {
1624 /* Connected mode sockets go via the LAPB machine */
1625 if (sk->sk_state != TCP_ESTABLISHED) {
1626 kfree_skb(skb);
1627 err = -ENOTCONN;
1628 goto out;
1629 }
1630
1631 /* Shove it onto the queue and kick */
1632 ax25_output(ax25, ax25->paclen, skb);
1633
1634 err = len;
1635 goto out;
1636 }
1637
967b05f6 1638 skb_push(skb, 1 + ax25_addr_size(dp));
1da177e4 1639
8849b720 1640 /* Building AX.25 Header */
1da177e4
LT		 1641
1642 /* Build an AX.25 header */
967b05f6
ACM		 1643 lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call,
1644 dp, AX25_COMMAND, AX25_MODULUS);
1da177e4 1645
967b05f6 1646 skb_set_transport_header(skb, lv);
1da177e4 1647
9c70220b 1648 *skb_transport_header(skb) = AX25_UI;
1da177e4
LT		 1649
1650 /* Datagram frames go straight out of the door as UI */
29c4be51 1651 ax25_queue_xmit(skb, ax25->ax25_dev->dev);
1da177e4
LT		 1652
1653 err = len;
1654
1655out:
1656 release_sock(sk);
1657
1658 return err;
1659}
1660
1b784140
YX		 1661static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1662 int flags)
1da177e4
LT		 1663{
1664 struct sock *sk = sock->sk;
219b51a6
DZ		 1665 struct sk_buff *skb, *last;
1666 struct sk_buff_head *sk_queue;
1da177e4
LT		 1667 int copied;
1668 int err = 0;
219b51a6
DZ		 1669 int off = 0;
1670 long timeo;
1da177e4
LT		 1671
1672 lock_sock(sk);
1673 /*
1674 * This works for seqpacket too. The receiver has ordered the
1675 * queue for us! We do one quick check first though
1676 */
1677 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) {
1678 err = -ENOTCONN;
1679 goto out;
1680 }
1681
219b51a6
DZ		 1682 /* We need support for non-blocking reads. */
1683 sk_queue = &sk->sk_receive_queue;
1684 skb = __skb_try_recv_datagram(sk, sk_queue, flags, &off, &err, &last);
1685 /* If no packet is available, release_sock(sk) and try again. */
1686 if (!skb) {
1687 if (err != -EAGAIN)
1688 goto out;
1689 release_sock(sk);
1690 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1691 while (timeo && !__skb_wait_for_more_packets(sk, sk_queue, &err,
1692 &timeo, last)) {
1693 skb = __skb_try_recv_datagram(sk, sk_queue, flags, &off,
1694 &err, &last);
1695 if (skb)
1696 break;
1697
1698 if (err != -EAGAIN)
1699 goto done;
1700 }
1701 if (!skb)
1702 goto done;
1703 lock_sock(sk);
1704 }
1da177e4 1705
3200392b 1706 if (!sk_to_ax25(sk)->pidincl)
1da177e4
LT		 1707 skb_pull(skb, 1); /* Remove PID */
1708
badff6d0
ACM		 1709 skb_reset_transport_header(skb);
1710 copied = skb->len;
1da177e4
LT		 1711
1712 if (copied > size) {
1713 copied = size;
1714 msg->msg_flags |= MSG_TRUNC;
1715 }
1716
51f3d02b 1717 skb_copy_datagram_msg(skb, 0, msg, copied);
1da177e4 1718
f3d33426 1719 if (msg->msg_name) {
1da177e4
LT		 1720 ax25_digi digi;
1721 ax25_address src;
98e399f8 1722 const unsigned char *mac = skb_mac_header(skb);
342dfc30 1723 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1da177e4 1724
ef3313e8 1725 memset(sax, 0, sizeof(struct full_sockaddr_ax25));
98e399f8
ACM		 1726 ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL,
1727 &digi, NULL, NULL);
1da177e4
LT		 1728 sax->sax25_family = AF_AX25;
1729 /* We set this correctly, even though we may not let the
1730 application know the digi calls further down (because it
1731 did NOT ask to know them). This could get political... **/
1732 sax->sax25_ndigis = digi.ndigi;
1733 sax->sax25_call = src;
1734
1735 if (sax->sax25_ndigis != 0) {
1736 int ct;
1737 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax;
1738
1739 for (ct = 0; ct < digi.ndigi; ct++)
1740 fsa->fsa_digipeater[ct] = digi.calls[ct];
1741 }
1742 msg->msg_namelen = sizeof(struct full_sockaddr_ax25);
1743 }
1744
1745 skb_free_datagram(sk, skb);
1746 err = copied;
1747
1748out:
1749 release_sock(sk);
1750
219b51a6 1751done:
1da177e4
LT		 1752 return err;
1753}
1754
1755static int ax25_shutdown(struct socket *sk, int how)
1756{
1757 /* FIXME - generate DM and RNR states */
1758 return -EOPNOTSUPP;
1759}
1760
1761static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1762{
1763 struct sock *sk = sock->sk;
1764 void __user *argp = (void __user *)arg;
1765 int res = 0;
1766
1767 lock_sock(sk);
1768 switch (cmd) {
1769 case TIOCOUTQ: {
1770 long amount;
31e6d363
ED		 1771
1772 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1da177e4
LT		 1773 if (amount < 0)
1774 amount = 0;
1775 res = put_user(amount, (int __user *)argp);
1776 break;
1777 }
1778
1779 case TIOCINQ: {
1780 struct sk_buff *skb;
1781 long amount = 0L;
1782 /* These two are safe on a single CPU system as only user tasks fiddle here */
1783 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1784 amount = skb->len;
20b7d10a 1785 res = put_user(amount, (int __user *) argp);
1da177e4
LT		 1786 break;
1787 }
1788
1da177e4
LT		 1789 case SIOCAX25ADDUID: /* Add a uid to the uid/call map table */
1790 case SIOCAX25DELUID: /* Delete a uid from the uid/call map table */
1791 case SIOCAX25GETUID: {
1792 struct sockaddr_ax25 sax25;
1793 if (copy_from_user(&sax25, argp, sizeof(sax25))) {
1794 res = -EFAULT;
1795 break;
1796 }
1797 res = ax25_uid_ioctl(cmd, &sax25);
1798 break;
1799 }
1800
1801 case SIOCAX25NOUID: { /* Set the default policy (default/bar) */
1802 long amount;
1803 if (!capable(CAP_NET_ADMIN)) {
1804 res = -EPERM;
1805 break;
1806 }
1807 if (get_user(amount, (long __user *)argp)) {
1808 res = -EFAULT;
1809 break;
1810 }
76887753 1811 if (amount < 0 || amount > AX25_NOUID_BLOCK) {
1da177e4
LT		 1812 res = -EINVAL;
1813 break;
1814 }
1815 ax25_uid_policy = amount;
1816 res = 0;
1817 break;
1818 }
1819
1820 case SIOCADDRT:
1821 case SIOCDELRT:
1822 case SIOCAX25OPTRT:
1823 if (!capable(CAP_NET_ADMIN)) {
1824 res = -EPERM;
1825 break;
1826 }
1827 res = ax25_rt_ioctl(cmd, argp);
1828 break;
1829
1830 case SIOCAX25CTLCON:
1831 if (!capable(CAP_NET_ADMIN)) {
1832 res = -EPERM;
1833 break;
1834 }
1835 res = ax25_ctl_ioctl(cmd, argp);
1836 break;
1837
1838 case SIOCAX25GETINFO:
1839 case SIOCAX25GETINFOOLD: {
3200392b 1840 ax25_cb *ax25 = sk_to_ax25(sk);
1da177e4
LT		 1841 struct ax25_info_struct ax25_info;
1842
1843 ax25_info.t1 = ax25->t1 / HZ;
1844 ax25_info.t2 = ax25->t2 / HZ;
1845 ax25_info.t3 = ax25->t3 / HZ;
1846 ax25_info.idle = ax25->idle / (60 * HZ);
1847 ax25_info.n2 = ax25->n2;
1848 ax25_info.t1timer = ax25_display_timer(&ax25->t1timer) / HZ;
1849 ax25_info.t2timer = ax25_display_timer(&ax25->t2timer) / HZ;
1850 ax25_info.t3timer = ax25_display_timer(&ax25->t3timer) / HZ;
1851 ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ);
1852 ax25_info.n2count = ax25->n2count;
1853 ax25_info.state = ax25->state;
407fc5cf
ED		 1854 ax25_info.rcv_q = sk_rmem_alloc_get(sk);
1855 ax25_info.snd_q = sk_wmem_alloc_get(sk);
1da177e4
LT		 1856 ax25_info.vs = ax25->vs;
1857 ax25_info.vr = ax25->vr;
1858 ax25_info.va = ax25->va;
1859 ax25_info.vs_max = ax25->vs; /* reserved */
1860 ax25_info.paclen = ax25->paclen;
1861 ax25_info.window = ax25->window;
1862
1863 /* old structure? */
1864 if (cmd == SIOCAX25GETINFOOLD) {
1865 static int warned = 0;
1866 if (!warned) {
1867 printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n",
1868 current->comm);
1869 warned=1;
1870 }
1871
1872 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) {
1873 res = -EFAULT;
1874 break;
1875 }
1876 } else {
1877 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) {
1878 res = -EINVAL;
1879 break;
1880 }
1881 }
1882 res = 0;
1883 break;
1884 }
1885
1886 case SIOCAX25ADDFWD:
1887 case SIOCAX25DELFWD: {
1888 struct ax25_fwd_struct ax25_fwd;
1889 if (!capable(CAP_NET_ADMIN)) {
1890 res = -EPERM;
1891 break;
1892 }
1893 if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) {
1894 res = -EFAULT;
1895 break;
1896 }
1897 res = ax25_fwd_ioctl(cmd, &ax25_fwd);
1898 break;
1899 }
1900
1901 case SIOCGIFADDR:
1902 case SIOCSIFADDR:
1903 case SIOCGIFDSTADDR:
1904 case SIOCSIFDSTADDR:
1905 case SIOCGIFBRDADDR:
1906 case SIOCSIFBRDADDR:
1907 case SIOCGIFNETMASK:
1908 case SIOCSIFNETMASK:
1909 case SIOCGIFMETRIC:
1910 case SIOCSIFMETRIC:
1911 res = -EINVAL;
1912 break;
1913
1914 default:
b5e5fa5e 1915 res = -ENOIOCTLCMD;
1da177e4
LT		 1916 break;
1917 }
1918 release_sock(sk);
1919
1920 return res;
1921}
1922
1923#ifdef CONFIG_PROC_FS
1924
1925static void *ax25_info_start(struct seq_file *seq, loff_t *pos)
f16f3026 1926 __acquires(ax25_list_lock)
1da177e4 1927{
1da177e4 1928 spin_lock_bh(&ax25_list_lock);
b512f3d8 1929 return seq_hlist_start(&ax25_list, *pos);
1da177e4
LT		 1930}
1931
1932static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos)
1933{
b512f3d8 1934 return seq_hlist_next(v, &ax25_list, pos);
1da177e4 1935}
528930b9 1936
1da177e4 1937static void ax25_info_stop(struct seq_file *seq, void *v)
f16f3026 1938 __releases(ax25_list_lock)
1da177e4
LT		 1939{
1940 spin_unlock_bh(&ax25_list_lock);
1941}
1942
1943static int ax25_info_show(struct seq_file *seq, void *v)
1944{
b512f3d8 1945 ax25_cb *ax25 = hlist_entry(v, struct ax25_cb, ax25_node);
f75268cd 1946 char buf[11];
1da177e4
LT		 1947 int k;
1948
1949
1950 /*
1951 * New format:
1952 * 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
1953 */
1954
966cddef
FH		 1955 seq_printf(seq, "%p %s %s%s ",
1956 ax25,
1da177e4 1957 ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name,
f75268cd 1958 ax2asc(buf, &ax25->source_addr),
1da177e4 1959 ax25->iamdigi? "*":"");
f75268cd 1960 seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr));
1da177e4
LT		 1961
1962 for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) {
1963 seq_printf(seq, ",%s%s",
f75268cd 1964 ax2asc(buf, &ax25->digipeat->calls[k]),
1da177e4
LT		 1965 ax25->digipeat->repeated[k]? "*":"");
1966 }
1967
1968 seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d",
1969 ax25->state,
1970 ax25->vs, ax25->vr, ax25->va,
1971 ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ,
1972 ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ,
1973 ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ,
1974 ax25_display_timer(&ax25->idletimer) / (60 * HZ),
1975 ax25->idle / (60 * HZ),
1976 ax25->n2count, ax25->n2,
1977 ax25->rtt / HZ,
1978 ax25->window,
1979 ax25->paclen);
1980
1981 if (ax25->sk != NULL) {
1105b5d1 1982 seq_printf(seq, " %d %d %lu\n",
31e6d363
ED		 1983 sk_wmem_alloc_get(ax25->sk),
1984 sk_rmem_alloc_get(ax25->sk),
1105b5d1 1985 sock_i_ino(ax25->sk));
1da177e4
LT		 1986 } else {
1987 seq_puts(seq, " * * *\n");
1988 }
1989 return 0;
1990}
1991
56b3d975 1992static const struct seq_operations ax25_info_seqops = {
1da177e4
LT		 1993 .start = ax25_info_start,
1994 .next = ax25_info_next,
1995 .stop = ax25_info_stop,
1996 .show = ax25_info_show,
1997};
1da177e4
LT		 1998#endif
1999
ec1b4cf7 2000static const struct net_proto_family ax25_family_ops = {
1da177e4
LT		 2001 .family = PF_AX25,
2002 .create = ax25_create,
2003 .owner = THIS_MODULE,
2004};
2005
90ddc4f0 2006static const struct proto_ops ax25_proto_ops = {
4676356b
RB		 2007 .family = PF_AX25,
2008 .owner = THIS_MODULE,
2009 .release = ax25_release,
2010 .bind = ax25_bind,
2011 .connect = ax25_connect,
2012 .socketpair = sock_no_socketpair,
2013 .accept = ax25_accept,
2014 .getname = ax25_getname,
a11e1d43 2015 .poll = datagram_poll,
4676356b 2016 .ioctl = ax25_ioctl,
c7cbdbf2 2017 .gettstamp = sock_gettstamp,
4676356b
RB		 2018 .listen = ax25_listen,
2019 .shutdown = ax25_shutdown,
2020 .setsockopt = ax25_setsockopt,
2021 .getsockopt = ax25_getsockopt,
2022 .sendmsg = ax25_sendmsg,
2023 .recvmsg = ax25_recvmsg,
2024 .mmap = sock_no_mmap,
1da177e4
LT		 2025};
2026
2027/*
2028 * Called by socket.c on kernel start up
2029 */
7546dd97 2030static struct packet_type ax25_packet_type __read_mostly = {
09640e63 2031 .type = cpu_to_be16(ETH_P_AX25),
1da177e4
LT		 2032 .func = ax25_kiss_rcv,
2033};
2034
2035static struct notifier_block ax25_dev_notifier = {
351638e7 2036 .notifier_call = ax25_device_event,
1da177e4
LT		 2037};
2038
1da177e4
LT		 2039static int __init ax25_init(void)
2040{
2041 int rc = proto_register(&ax25_proto, 0);
2042
2043 if (rc != 0)
2044 goto out;
2045
2046 sock_register(&ax25_family_ops);
2047 dev_add_pack(&ax25_packet_type);
2048 register_netdevice_notifier(&ax25_dev_notifier);
1da177e4 2049
fddda2b7
CH		 2050 proc_create_seq("ax25_route", 0444, init_net.proc_net, &ax25_rt_seqops);
2051 proc_create_seq("ax25", 0444, init_net.proc_net, &ax25_info_seqops);
2052 proc_create_seq("ax25_calls", 0444, init_net.proc_net,
2053 &ax25_uid_seqops);
1da177e4
LT		 2054out:
2055 return rc;
2056}
2057module_init(ax25_init);
2058
2059
2060MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
2061MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol");
2062MODULE_LICENSE("GPL");
2063MODULE_ALIAS_NETPROTO(PF_AX25);
2064
2065static void __exit ax25_exit(void)
2066{
ece31ffd
G		 2067 remove_proc_entry("ax25_route", init_net.proc_net);
2068 remove_proc_entry("ax25", init_net.proc_net);
2069 remove_proc_entry("ax25_calls", init_net.proc_net);
1da177e4 2070
1da177e4
LT		 2071 unregister_netdevice_notifier(&ax25_dev_notifier);
2072
2073 dev_remove_pack(&ax25_packet_type);
2074
2075 sock_unregister(PF_AX25);
2076 proto_unregister(&ax25_proto);
3adadc08
EB		 2077
2078 ax25_rt_free();
2079 ax25_uid_free();
2080 ax25_dev_free();
1da177e4
LT		 2081}
2082module_exit(ax25_exit);
Linux 6.x block layer and io_uring tree(s)