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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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. | |
6 | * | |
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) | |
15 | */ | |
4fc268d2 | 16 | #include <linux/capability.h> |
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/errno.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/socket.h> | |
21 | #include <linux/in.h> | |
22 | #include <linux/kernel.h> | |
3f07c014 | 23 | #include <linux/sched/signal.h> |
1da177e4 LT |
24 | #include <linux/timer.h> |
25 | #include <linux/string.h> | |
1da177e4 LT |
26 | #include <linux/sockios.h> |
27 | #include <linux/net.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
1da177e4 LT |
29 | #include <net/ax25.h> |
30 | #include <linux/inet.h> | |
31 | #include <linux/netdevice.h> | |
32 | #include <linux/if_arp.h> | |
33 | #include <linux/skbuff.h> | |
34 | #include <net/sock.h> | |
7c0f6ba6 | 35 | #include <linux/uaccess.h> |
1da177e4 LT |
36 | #include <linux/fcntl.h> |
37 | #include <linux/termios.h> /* For TIOCINQ/OUTQ */ | |
38 | #include <linux/mm.h> | |
39 | #include <linux/interrupt.h> | |
40 | #include <linux/notifier.h> | |
41 | #include <linux/proc_fs.h> | |
42 | #include <linux/stat.h> | |
1da177e4 LT |
43 | #include <linux/sysctl.h> |
44 | #include <linux/init.h> | |
45 | #include <linux/spinlock.h> | |
457c4cbc | 46 | #include <net/net_namespace.h> |
c752f073 | 47 | #include <net/tcp_states.h> |
1da177e4 LT |
48 | #include <net/ip.h> |
49 | #include <net/arp.h> | |
50 | ||
51 | ||
52 | ||
53 | HLIST_HEAD(ax25_list); | |
54 | DEFINE_SPINLOCK(ax25_list_lock); | |
55 | ||
90ddc4f0 | 56 | static const struct proto_ops ax25_proto_ops; |
1da177e4 LT |
57 | |
58 | static void ax25_free_sock(struct sock *sk) | |
59 | { | |
3200392b | 60 | ax25_cb_put(sk_to_ax25(sk)); |
1da177e4 LT |
61 | } |
62 | ||
63 | /* | |
64 | * Socket removal during an interrupt is now safe. | |
65 | */ | |
66 | static void ax25_cb_del(ax25_cb *ax25) | |
67 | { | |
68 | if (!hlist_unhashed(&ax25->ax25_node)) { | |
69 | spin_lock_bh(&ax25_list_lock); | |
70 | hlist_del_init(&ax25->ax25_node); | |
71 | spin_unlock_bh(&ax25_list_lock); | |
72 | ax25_cb_put(ax25); | |
73 | } | |
74 | } | |
75 | ||
76 | /* | |
77 | * Kill all bound sockets on a dropped device. | |
78 | */ | |
79 | static void ax25_kill_by_device(struct net_device *dev) | |
80 | { | |
81 | ax25_dev *ax25_dev; | |
82 | ax25_cb *s; | |
1da177e4 LT |
83 | |
84 | if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) | |
85 | return; | |
86 | ||
87 | spin_lock_bh(&ax25_list_lock); | |
ecd2ebde | 88 | again: |
b67bfe0d | 89 | ax25_for_each(s, &ax25_list) { |
1da177e4 LT |
90 | if (s->ax25_dev == ax25_dev) { |
91 | s->ax25_dev = NULL; | |
ecd2ebde | 92 | spin_unlock_bh(&ax25_list_lock); |
1da177e4 | 93 | ax25_disconnect(s, ENETUNREACH); |
ecd2ebde JP |
94 | spin_lock_bh(&ax25_list_lock); |
95 | ||
96 | /* The entry could have been deleted from the | |
97 | * list meanwhile and thus the next pointer is | |
98 | * no longer valid. Play it safe and restart | |
99 | * the scan. Forward progress is ensured | |
100 | * because we set s->ax25_dev to NULL and we | |
101 | * are never passed a NULL 'dev' argument. | |
102 | */ | |
103 | goto again; | |
1da177e4 LT |
104 | } |
105 | } | |
106 | spin_unlock_bh(&ax25_list_lock); | |
107 | } | |
108 | ||
109 | /* | |
110 | * Handle device status changes. | |
111 | */ | |
112 | static int ax25_device_event(struct notifier_block *this, unsigned long event, | |
351638e7 | 113 | void *ptr) |
1da177e4 | 114 | { |
351638e7 | 115 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
1da177e4 | 116 | |
721499e8 | 117 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
118 | return NOTIFY_DONE; |
119 | ||
1da177e4 LT |
120 | /* Reject non AX.25 devices */ |
121 | if (dev->type != ARPHRD_AX25) | |
122 | return NOTIFY_DONE; | |
123 | ||
124 | switch (event) { | |
125 | case NETDEV_UP: | |
126 | ax25_dev_device_up(dev); | |
127 | break; | |
128 | case NETDEV_DOWN: | |
129 | ax25_kill_by_device(dev); | |
130 | ax25_rt_device_down(dev); | |
131 | ax25_dev_device_down(dev); | |
132 | break; | |
133 | default: | |
134 | break; | |
135 | } | |
136 | ||
137 | return NOTIFY_DONE; | |
138 | } | |
139 | ||
140 | /* | |
141 | * Add a socket to the bound sockets list. | |
142 | */ | |
143 | void ax25_cb_add(ax25_cb *ax25) | |
144 | { | |
145 | spin_lock_bh(&ax25_list_lock); | |
146 | ax25_cb_hold(ax25); | |
147 | hlist_add_head(&ax25->ax25_node, &ax25_list); | |
148 | spin_unlock_bh(&ax25_list_lock); | |
149 | } | |
150 | ||
151 | /* | |
152 | * Find a socket that wants to accept the SABM we have just | |
153 | * received. | |
154 | */ | |
155 | struct sock *ax25_find_listener(ax25_address *addr, int digi, | |
156 | struct net_device *dev, int type) | |
157 | { | |
158 | ax25_cb *s; | |
1da177e4 | 159 | |
c19c4b9c | 160 | spin_lock(&ax25_list_lock); |
b67bfe0d | 161 | ax25_for_each(s, &ax25_list) { |
1da177e4 LT |
162 | if ((s->iamdigi && !digi) || (!s->iamdigi && digi)) |
163 | continue; | |
164 | if (s->sk && !ax25cmp(&s->source_addr, addr) && | |
165 | s->sk->sk_type == type && s->sk->sk_state == TCP_LISTEN) { | |
166 | /* If device is null we match any device */ | |
167 | if (s->ax25_dev == NULL || s->ax25_dev->dev == dev) { | |
168 | sock_hold(s->sk); | |
c19c4b9c | 169 | spin_unlock(&ax25_list_lock); |
1da177e4 LT |
170 | return s->sk; |
171 | } | |
172 | } | |
173 | } | |
c19c4b9c | 174 | spin_unlock(&ax25_list_lock); |
1da177e4 LT |
175 | |
176 | return NULL; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Find an AX.25 socket given both ends. | |
181 | */ | |
182 | struct sock *ax25_get_socket(ax25_address *my_addr, ax25_address *dest_addr, | |
183 | int type) | |
184 | { | |
185 | struct sock *sk = NULL; | |
186 | ax25_cb *s; | |
1da177e4 | 187 | |
c19c4b9c | 188 | spin_lock(&ax25_list_lock); |
b67bfe0d | 189 | ax25_for_each(s, &ax25_list) { |
1da177e4 LT |
190 | if (s->sk && !ax25cmp(&s->source_addr, my_addr) && |
191 | !ax25cmp(&s->dest_addr, dest_addr) && | |
192 | s->sk->sk_type == type) { | |
193 | sk = s->sk; | |
194 | sock_hold(sk); | |
195 | break; | |
196 | } | |
197 | } | |
198 | ||
c19c4b9c | 199 | spin_unlock(&ax25_list_lock); |
1da177e4 LT |
200 | |
201 | return sk; | |
202 | } | |
203 | ||
204 | /* | |
205 | * Find an AX.25 control block given both ends. It will only pick up | |
206 | * floating AX.25 control blocks or non Raw socket bound control blocks. | |
207 | */ | |
208 | ax25_cb *ax25_find_cb(ax25_address *src_addr, ax25_address *dest_addr, | |
209 | ax25_digi *digi, struct net_device *dev) | |
210 | { | |
211 | ax25_cb *s; | |
1da177e4 LT |
212 | |
213 | spin_lock_bh(&ax25_list_lock); | |
b67bfe0d | 214 | ax25_for_each(s, &ax25_list) { |
1da177e4 LT |
215 | if (s->sk && s->sk->sk_type != SOCK_SEQPACKET) |
216 | continue; | |
217 | if (s->ax25_dev == NULL) | |
218 | continue; | |
219 | if (ax25cmp(&s->source_addr, src_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->ax25_dev->dev == dev) { | |
220 | if (digi != NULL && digi->ndigi != 0) { | |
221 | if (s->digipeat == NULL) | |
222 | continue; | |
223 | if (ax25digicmp(s->digipeat, digi) != 0) | |
224 | continue; | |
225 | } else { | |
226 | if (s->digipeat != NULL && s->digipeat->ndigi != 0) | |
227 | continue; | |
228 | } | |
229 | ax25_cb_hold(s); | |
230 | spin_unlock_bh(&ax25_list_lock); | |
231 | ||
232 | return s; | |
233 | } | |
234 | } | |
235 | spin_unlock_bh(&ax25_list_lock); | |
236 | ||
237 | return NULL; | |
238 | } | |
239 | ||
70868eac RB |
240 | EXPORT_SYMBOL(ax25_find_cb); |
241 | ||
1da177e4 LT |
242 | void ax25_send_to_raw(ax25_address *addr, struct sk_buff *skb, int proto) |
243 | { | |
244 | ax25_cb *s; | |
245 | struct sk_buff *copy; | |
1da177e4 | 246 | |
c19c4b9c | 247 | spin_lock(&ax25_list_lock); |
b67bfe0d | 248 | ax25_for_each(s, &ax25_list) { |
1da177e4 LT |
249 | if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 && |
250 | s->sk->sk_type == SOCK_RAW && | |
251 | s->sk->sk_protocol == proto && | |
252 | s->ax25_dev->dev == skb->dev && | |
253 | atomic_read(&s->sk->sk_rmem_alloc) <= s->sk->sk_rcvbuf) { | |
254 | if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL) | |
255 | continue; | |
256 | if (sock_queue_rcv_skb(s->sk, copy) != 0) | |
257 | kfree_skb(copy); | |
258 | } | |
259 | } | |
c19c4b9c | 260 | spin_unlock(&ax25_list_lock); |
1da177e4 LT |
261 | } |
262 | ||
263 | /* | |
264 | * Deferred destroy. | |
265 | */ | |
266 | void ax25_destroy_socket(ax25_cb *); | |
267 | ||
268 | /* | |
269 | * Handler for deferred kills. | |
270 | */ | |
8dbd05ff | 271 | static void ax25_destroy_timer(struct timer_list *t) |
1da177e4 | 272 | { |
8dbd05ff | 273 | ax25_cb *ax25 = from_timer(ax25, t, dtimer); |
1da177e4 | 274 | struct sock *sk; |
528930b9 | 275 | |
1da177e4 | 276 | sk=ax25->sk; |
528930b9 | 277 | |
1da177e4 LT |
278 | bh_lock_sock(sk); |
279 | sock_hold(sk); | |
280 | ax25_destroy_socket(ax25); | |
281 | bh_unlock_sock(sk); | |
282 | sock_put(sk); | |
283 | } | |
284 | ||
285 | /* | |
286 | * This is called from user mode and the timers. Thus it protects itself | |
287 | * against interrupt users but doesn't worry about being called during | |
288 | * work. Once it is removed from the queue no interrupt or bottom half | |
289 | * will touch it and we are (fairly 8-) ) safe. | |
290 | */ | |
291 | void ax25_destroy_socket(ax25_cb *ax25) | |
292 | { | |
293 | struct sk_buff *skb; | |
294 | ||
295 | ax25_cb_del(ax25); | |
296 | ||
297 | ax25_stop_heartbeat(ax25); | |
298 | ax25_stop_t1timer(ax25); | |
299 | ax25_stop_t2timer(ax25); | |
300 | ax25_stop_t3timer(ax25); | |
301 | ax25_stop_idletimer(ax25); | |
302 | ||
303 | ax25_clear_queues(ax25); /* Flush the queues */ | |
304 | ||
305 | if (ax25->sk != NULL) { | |
306 | while ((skb = skb_dequeue(&ax25->sk->sk_receive_queue)) != NULL) { | |
307 | if (skb->sk != ax25->sk) { | |
308 | /* A pending connection */ | |
3200392b | 309 | ax25_cb *sax25 = sk_to_ax25(skb->sk); |
1da177e4 LT |
310 | |
311 | /* Queue the unaccepted socket for death */ | |
312 | sock_orphan(skb->sk); | |
313 | ||
33d1d2c5 DM |
314 | /* 9A4GL: hack to release unaccepted sockets */ |
315 | skb->sk->sk_state = TCP_LISTEN; | |
316 | ||
1da177e4 LT |
317 | ax25_start_heartbeat(sax25); |
318 | sax25->state = AX25_STATE_0; | |
319 | } | |
320 | ||
321 | kfree_skb(skb); | |
322 | } | |
323 | skb_queue_purge(&ax25->sk->sk_write_queue); | |
324 | } | |
325 | ||
326 | if (ax25->sk != NULL) { | |
c564039f | 327 | if (sk_has_allocations(ax25->sk)) { |
1da177e4 | 328 | /* Defer: outstanding buffers */ |
8dbd05ff | 329 | timer_setup(&ax25->dtimer, ax25_destroy_timer, 0); |
1da177e4 | 330 | ax25->dtimer.expires = jiffies + 2 * HZ; |
1da177e4 LT |
331 | add_timer(&ax25->dtimer); |
332 | } else { | |
333 | struct sock *sk=ax25->sk; | |
334 | ax25->sk=NULL; | |
335 | sock_put(sk); | |
336 | } | |
337 | } else { | |
338 | ax25_cb_put(ax25); | |
339 | } | |
340 | } | |
341 | ||
342 | /* | |
343 | * dl1bke 960311: set parameters for existing AX.25 connections, | |
344 | * includes a KILL command to abort any connection. | |
345 | * VERY useful for debugging ;-) | |
346 | */ | |
347 | static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg) | |
348 | { | |
349 | struct ax25_ctl_struct ax25_ctl; | |
350 | ax25_digi digi; | |
351 | ax25_dev *ax25_dev; | |
352 | ax25_cb *ax25; | |
353 | unsigned int k; | |
c0181d42 | 354 | int ret = 0; |
1da177e4 LT |
355 | |
356 | if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl))) | |
357 | return -EFAULT; | |
358 | ||
359 | if ((ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr)) == NULL) | |
360 | return -ENODEV; | |
361 | ||
362 | if (ax25_ctl.digi_count > AX25_MAX_DIGIS) | |
363 | return -EINVAL; | |
364 | ||
43ab8502 | 365 | if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL) |
366 | return -EINVAL; | |
367 | ||
1da177e4 LT |
368 | digi.ndigi = ax25_ctl.digi_count; |
369 | for (k = 0; k < digi.ndigi; k++) | |
370 | digi.calls[k] = ax25_ctl.digi_addr[k]; | |
371 | ||
372 | if ((ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev)) == NULL) | |
373 | return -ENOTCONN; | |
374 | ||
375 | switch (ax25_ctl.cmd) { | |
376 | case AX25_KILL: | |
377 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); | |
378 | #ifdef CONFIG_AX25_DAMA_SLAVE | |
379 | if (ax25_dev->dama.slave && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE) | |
380 | ax25_dama_off(ax25); | |
381 | #endif | |
382 | ax25_disconnect(ax25, ENETRESET); | |
383 | break; | |
384 | ||
528930b9 YH |
385 | case AX25_WINDOW: |
386 | if (ax25->modulus == AX25_MODULUS) { | |
387 | if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7) | |
c0181d42 | 388 | goto einval_put; |
528930b9 YH |
389 | } else { |
390 | if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63) | |
c0181d42 | 391 | goto einval_put; |
528930b9 YH |
392 | } |
393 | ax25->window = ax25_ctl.arg; | |
394 | break; | |
395 | ||
396 | case AX25_T1: | |
be639ac6 | 397 | if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) |
c0181d42 | 398 | goto einval_put; |
528930b9 YH |
399 | ax25->rtt = (ax25_ctl.arg * HZ) / 2; |
400 | ax25->t1 = ax25_ctl.arg * HZ; | |
401 | break; | |
402 | ||
403 | case AX25_T2: | |
be639ac6 | 404 | if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) |
c0181d42 | 405 | goto einval_put; |
528930b9 YH |
406 | ax25->t2 = ax25_ctl.arg * HZ; |
407 | break; | |
408 | ||
409 | case AX25_N2: | |
410 | if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31) | |
c0181d42 | 411 | goto einval_put; |
528930b9 YH |
412 | ax25->n2count = 0; |
413 | ax25->n2 = ax25_ctl.arg; | |
414 | break; | |
415 | ||
416 | case AX25_T3: | |
be639ac6 RB |
417 | if (ax25_ctl.arg > ULONG_MAX / HZ) |
418 | goto einval_put; | |
528930b9 YH |
419 | ax25->t3 = ax25_ctl.arg * HZ; |
420 | break; | |
421 | ||
422 | case AX25_IDLE: | |
be639ac6 RB |
423 | if (ax25_ctl.arg > ULONG_MAX / (60 * HZ)) |
424 | goto einval_put; | |
425 | ||
528930b9 YH |
426 | ax25->idle = ax25_ctl.arg * 60 * HZ; |
427 | break; | |
428 | ||
429 | case AX25_PACLEN: | |
430 | if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535) | |
c0181d42 | 431 | goto einval_put; |
528930b9 YH |
432 | ax25->paclen = ax25_ctl.arg; |
433 | break; | |
434 | ||
435 | default: | |
c0181d42 | 436 | goto einval_put; |
1da177e4 LT |
437 | } |
438 | ||
c0181d42 JP |
439 | out_put: |
440 | ax25_cb_put(ax25); | |
441 | return ret; | |
442 | ||
443 | einval_put: | |
444 | ret = -EINVAL; | |
445 | goto out_put; | |
1da177e4 LT |
446 | } |
447 | ||
e1fdb5b3 RB |
448 | static void ax25_fillin_cb_from_dev(ax25_cb *ax25, ax25_dev *ax25_dev) |
449 | { | |
450 | ax25->rtt = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]) / 2; | |
451 | ax25->t1 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]); | |
452 | ax25->t2 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T2]); | |
453 | ax25->t3 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T3]); | |
454 | ax25->n2 = ax25_dev->values[AX25_VALUES_N2]; | |
455 | ax25->paclen = ax25_dev->values[AX25_VALUES_PACLEN]; | |
456 | ax25->idle = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_IDLE]); | |
457 | ax25->backoff = ax25_dev->values[AX25_VALUES_BACKOFF]; | |
458 | ||
459 | if (ax25_dev->values[AX25_VALUES_AXDEFMODE]) { | |
460 | ax25->modulus = AX25_EMODULUS; | |
461 | ax25->window = ax25_dev->values[AX25_VALUES_EWINDOW]; | |
462 | } else { | |
463 | ax25->modulus = AX25_MODULUS; | |
464 | ax25->window = ax25_dev->values[AX25_VALUES_WINDOW]; | |
465 | } | |
466 | } | |
467 | ||
1da177e4 LT |
468 | /* |
469 | * Fill in a created AX.25 created control block with the default | |
470 | * values for a particular device. | |
471 | */ | |
472 | void ax25_fillin_cb(ax25_cb *ax25, ax25_dev *ax25_dev) | |
473 | { | |
474 | ax25->ax25_dev = ax25_dev; | |
475 | ||
476 | if (ax25->ax25_dev != NULL) { | |
e1fdb5b3 RB |
477 | ax25_fillin_cb_from_dev(ax25, ax25_dev); |
478 | return; | |
479 | } | |
480 | ||
481 | /* | |
482 | * No device, use kernel / AX.25 spec default values | |
483 | */ | |
484 | ax25->rtt = msecs_to_jiffies(AX25_DEF_T1) / 2; | |
485 | ax25->t1 = msecs_to_jiffies(AX25_DEF_T1); | |
486 | ax25->t2 = msecs_to_jiffies(AX25_DEF_T2); | |
487 | ax25->t3 = msecs_to_jiffies(AX25_DEF_T3); | |
488 | ax25->n2 = AX25_DEF_N2; | |
489 | ax25->paclen = AX25_DEF_PACLEN; | |
490 | ax25->idle = msecs_to_jiffies(AX25_DEF_IDLE); | |
491 | ax25->backoff = AX25_DEF_BACKOFF; | |
492 | ||
493 | if (AX25_DEF_AXDEFMODE) { | |
494 | ax25->modulus = AX25_EMODULUS; | |
495 | ax25->window = AX25_DEF_EWINDOW; | |
1da177e4 | 496 | } else { |
e1fdb5b3 RB |
497 | ax25->modulus = AX25_MODULUS; |
498 | ax25->window = AX25_DEF_WINDOW; | |
1da177e4 LT |
499 | } |
500 | } | |
501 | ||
502 | /* | |
503 | * Create an empty AX.25 control block. | |
504 | */ | |
505 | ax25_cb *ax25_create_cb(void) | |
506 | { | |
507 | ax25_cb *ax25; | |
508 | ||
1b30dd35 | 509 | if ((ax25 = kzalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL) |
1da177e4 LT |
510 | return NULL; |
511 | ||
b6d52ede | 512 | refcount_set(&ax25->refcount, 1); |
1da177e4 LT |
513 | |
514 | skb_queue_head_init(&ax25->write_queue); | |
515 | skb_queue_head_init(&ax25->frag_queue); | |
516 | skb_queue_head_init(&ax25->ack_queue); | |
517 | skb_queue_head_init(&ax25->reseq_queue); | |
518 | ||
21fab4a8 | 519 | ax25_setup_timers(ax25); |
1da177e4 LT |
520 | |
521 | ax25_fillin_cb(ax25, NULL); | |
522 | ||
523 | ax25->state = AX25_STATE_0; | |
524 | ||
525 | return ax25; | |
526 | } | |
527 | ||
528 | /* | |
529 | * Handling for system calls applied via the various interfaces to an | |
530 | * AX25 socket object | |
531 | */ | |
532 | ||
533 | static int ax25_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 534 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
535 | { |
536 | struct sock *sk = sock->sk; | |
537 | ax25_cb *ax25; | |
538 | struct net_device *dev; | |
539 | char devname[IFNAMSIZ]; | |
ba1cffe0 XW |
540 | unsigned long opt; |
541 | int res = 0; | |
1da177e4 LT |
542 | |
543 | if (level != SOL_AX25) | |
544 | return -ENOPROTOOPT; | |
545 | ||
ba1cffe0 | 546 | if (optlen < sizeof(unsigned int)) |
1da177e4 LT |
547 | return -EINVAL; |
548 | ||
ba1cffe0 | 549 | if (get_user(opt, (unsigned int __user *)optval)) |
1da177e4 LT |
550 | return -EFAULT; |
551 | ||
552 | lock_sock(sk); | |
3200392b | 553 | ax25 = sk_to_ax25(sk); |
1da177e4 LT |
554 | |
555 | switch (optname) { | |
556 | case AX25_WINDOW: | |
557 | if (ax25->modulus == AX25_MODULUS) { | |
558 | if (opt < 1 || opt > 7) { | |
559 | res = -EINVAL; | |
560 | break; | |
561 | } | |
562 | } else { | |
563 | if (opt < 1 || opt > 63) { | |
564 | res = -EINVAL; | |
565 | break; | |
566 | } | |
567 | } | |
568 | ax25->window = opt; | |
569 | break; | |
570 | ||
571 | case AX25_T1: | |
be639ac6 | 572 | if (opt < 1 || opt > ULONG_MAX / HZ) { |
1da177e4 LT |
573 | res = -EINVAL; |
574 | break; | |
575 | } | |
f16f3026 | 576 | ax25->rtt = (opt * HZ) >> 1; |
1da177e4 LT |
577 | ax25->t1 = opt * HZ; |
578 | break; | |
579 | ||
580 | case AX25_T2: | |
be639ac6 | 581 | if (opt < 1 || opt > ULONG_MAX / HZ) { |
1da177e4 LT |
582 | res = -EINVAL; |
583 | break; | |
584 | } | |
585 | ax25->t2 = opt * HZ; | |
586 | break; | |
587 | ||
588 | case AX25_N2: | |
589 | if (opt < 1 || opt > 31) { | |
590 | res = -EINVAL; | |
591 | break; | |
592 | } | |
593 | ax25->n2 = opt; | |
594 | break; | |
595 | ||
596 | case AX25_T3: | |
be639ac6 | 597 | if (opt < 1 || opt > ULONG_MAX / HZ) { |
1da177e4 LT |
598 | res = -EINVAL; |
599 | break; | |
600 | } | |
601 | ax25->t3 = opt * HZ; | |
602 | break; | |
603 | ||
604 | case AX25_IDLE: | |
ba1cffe0 | 605 | if (opt > ULONG_MAX / (60 * HZ)) { |
1da177e4 LT |
606 | res = -EINVAL; |
607 | break; | |
608 | } | |
609 | ax25->idle = opt * 60 * HZ; | |
610 | break; | |
611 | ||
612 | case AX25_BACKOFF: | |
ba1cffe0 | 613 | if (opt > 2) { |
1da177e4 LT |
614 | res = -EINVAL; |
615 | break; | |
616 | } | |
617 | ax25->backoff = opt; | |
618 | break; | |
619 | ||
620 | case AX25_EXTSEQ: | |
621 | ax25->modulus = opt ? AX25_EMODULUS : AX25_MODULUS; | |
622 | break; | |
623 | ||
624 | case AX25_PIDINCL: | |
625 | ax25->pidincl = opt ? 1 : 0; | |
626 | break; | |
627 | ||
628 | case AX25_IAMDIGI: | |
629 | ax25->iamdigi = opt ? 1 : 0; | |
630 | break; | |
631 | ||
632 | case AX25_PACLEN: | |
633 | if (opt < 16 || opt > 65535) { | |
634 | res = -EINVAL; | |
635 | break; | |
636 | } | |
637 | ax25->paclen = opt; | |
638 | break; | |
639 | ||
640 | case SO_BINDTODEVICE: | |
641 | if (optlen > IFNAMSIZ) | |
2f72291d | 642 | optlen = IFNAMSIZ; |
1da177e4 | 643 | |
2f72291d RB |
644 | if (copy_from_user(devname, optval, optlen)) { |
645 | res = -EFAULT; | |
1da177e4 LT |
646 | break; |
647 | } | |
648 | ||
649 | if (sk->sk_type == SOCK_SEQPACKET && | |
650 | (sock->state != SS_UNCONNECTED || | |
651 | sk->sk_state == TCP_LISTEN)) { | |
652 | res = -EADDRNOTAVAIL; | |
2f72291d RB |
653 | break; |
654 | } | |
655 | ||
656 | dev = dev_get_by_name(&init_net, devname); | |
657 | if (!dev) { | |
658 | res = -ENODEV; | |
1da177e4 LT |
659 | break; |
660 | } | |
661 | ||
662 | ax25->ax25_dev = ax25_dev_ax25dev(dev); | |
663 | ax25_fillin_cb(ax25, ax25->ax25_dev); | |
2f72291d | 664 | dev_put(dev); |
1da177e4 LT |
665 | break; |
666 | ||
667 | default: | |
668 | res = -ENOPROTOOPT; | |
669 | } | |
670 | release_sock(sk); | |
671 | ||
672 | return res; | |
673 | } | |
674 | ||
675 | static int ax25_getsockopt(struct socket *sock, int level, int optname, | |
676 | char __user *optval, int __user *optlen) | |
677 | { | |
678 | struct sock *sk = sock->sk; | |
679 | ax25_cb *ax25; | |
680 | struct ax25_dev *ax25_dev; | |
681 | char devname[IFNAMSIZ]; | |
682 | void *valptr; | |
683 | int val = 0; | |
684 | int maxlen, length; | |
685 | ||
686 | if (level != SOL_AX25) | |
687 | return -ENOPROTOOPT; | |
688 | ||
689 | if (get_user(maxlen, optlen)) | |
690 | return -EFAULT; | |
691 | ||
692 | if (maxlen < 1) | |
693 | return -EFAULT; | |
694 | ||
695 | valptr = (void *) &val; | |
696 | length = min_t(unsigned int, maxlen, sizeof(int)); | |
697 | ||
698 | lock_sock(sk); | |
3200392b | 699 | ax25 = sk_to_ax25(sk); |
1da177e4 LT |
700 | |
701 | switch (optname) { | |
702 | case AX25_WINDOW: | |
703 | val = ax25->window; | |
704 | break; | |
705 | ||
706 | case AX25_T1: | |
707 | val = ax25->t1 / HZ; | |
708 | break; | |
709 | ||
710 | case AX25_T2: | |
711 | val = ax25->t2 / HZ; | |
712 | break; | |
713 | ||
714 | case AX25_N2: | |
715 | val = ax25->n2; | |
716 | break; | |
717 | ||
718 | case AX25_T3: | |
719 | val = ax25->t3 / HZ; | |
720 | break; | |
721 | ||
722 | case AX25_IDLE: | |
723 | val = ax25->idle / (60 * HZ); | |
724 | break; | |
725 | ||
726 | case AX25_BACKOFF: | |
727 | val = ax25->backoff; | |
728 | break; | |
729 | ||
730 | case AX25_EXTSEQ: | |
731 | val = (ax25->modulus == AX25_EMODULUS); | |
732 | break; | |
733 | ||
734 | case AX25_PIDINCL: | |
735 | val = ax25->pidincl; | |
736 | break; | |
737 | ||
738 | case AX25_IAMDIGI: | |
739 | val = ax25->iamdigi; | |
740 | break; | |
741 | ||
742 | case AX25_PACLEN: | |
743 | val = ax25->paclen; | |
744 | break; | |
745 | ||
746 | case SO_BINDTODEVICE: | |
747 | ax25_dev = ax25->ax25_dev; | |
748 | ||
749 | if (ax25_dev != NULL && ax25_dev->dev != NULL) { | |
750 | strlcpy(devname, ax25_dev->dev->name, sizeof(devname)); | |
751 | length = strlen(devname) + 1; | |
752 | } else { | |
753 | *devname = '\0'; | |
754 | length = 1; | |
755 | } | |
756 | ||
757 | valptr = (void *) devname; | |
758 | break; | |
759 | ||
760 | default: | |
761 | release_sock(sk); | |
762 | return -ENOPROTOOPT; | |
763 | } | |
764 | release_sock(sk); | |
765 | ||
766 | if (put_user(length, optlen)) | |
767 | return -EFAULT; | |
768 | ||
769 | return copy_to_user(optval, valptr, length) ? -EFAULT : 0; | |
770 | } | |
771 | ||
772 | static int ax25_listen(struct socket *sock, int backlog) | |
773 | { | |
774 | struct sock *sk = sock->sk; | |
775 | int res = 0; | |
776 | ||
777 | lock_sock(sk); | |
778 | if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_LISTEN) { | |
779 | sk->sk_max_ack_backlog = backlog; | |
780 | sk->sk_state = TCP_LISTEN; | |
781 | goto out; | |
782 | } | |
783 | res = -EOPNOTSUPP; | |
784 | ||
785 | out: | |
786 | release_sock(sk); | |
787 | ||
788 | return res; | |
789 | } | |
790 | ||
791 | /* | |
792 | * XXX: when creating ax25_sock we should update the .obj_size setting | |
793 | * below. | |
794 | */ | |
795 | static struct proto ax25_proto = { | |
796 | .name = "AX25", | |
797 | .owner = THIS_MODULE, | |
3200392b | 798 | .obj_size = sizeof(struct ax25_sock), |
1da177e4 LT |
799 | }; |
800 | ||
3f378b68 EP |
801 | static int ax25_create(struct net *net, struct socket *sock, int protocol, |
802 | int kern) | |
1da177e4 LT |
803 | { |
804 | struct sock *sk; | |
805 | ax25_cb *ax25; | |
806 | ||
79462ad0 HFS |
807 | if (protocol < 0 || protocol > SK_PROTOCOL_MAX) |
808 | return -EINVAL; | |
809 | ||
09ad9bc7 | 810 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
811 | return -EAFNOSUPPORT; |
812 | ||
1da177e4 LT |
813 | switch (sock->type) { |
814 | case SOCK_DGRAM: | |
815 | if (protocol == 0 || protocol == PF_AX25) | |
816 | protocol = AX25_P_TEXT; | |
817 | break; | |
818 | ||
819 | case SOCK_SEQPACKET: | |
820 | switch (protocol) { | |
821 | case 0: | |
822 | case PF_AX25: /* For CLX */ | |
823 | protocol = AX25_P_TEXT; | |
824 | break; | |
825 | case AX25_P_SEGMENT: | |
826 | #ifdef CONFIG_INET | |
827 | case AX25_P_ARP: | |
828 | case AX25_P_IP: | |
829 | #endif | |
830 | #ifdef CONFIG_NETROM | |
831 | case AX25_P_NETROM: | |
832 | #endif | |
833 | #ifdef CONFIG_ROSE | |
834 | case AX25_P_ROSE: | |
835 | #endif | |
836 | return -ESOCKTNOSUPPORT; | |
837 | #ifdef CONFIG_NETROM_MODULE | |
838 | case AX25_P_NETROM: | |
839 | if (ax25_protocol_is_registered(AX25_P_NETROM)) | |
840 | return -ESOCKTNOSUPPORT; | |
ef764a13 | 841 | break; |
1da177e4 LT |
842 | #endif |
843 | #ifdef CONFIG_ROSE_MODULE | |
844 | case AX25_P_ROSE: | |
845 | if (ax25_protocol_is_registered(AX25_P_ROSE)) | |
846 | return -ESOCKTNOSUPPORT; | |
847 | #endif | |
848 | default: | |
849 | break; | |
850 | } | |
851 | break; | |
852 | ||
853 | case SOCK_RAW: | |
854 | break; | |
855 | default: | |
856 | return -ESOCKTNOSUPPORT; | |
857 | } | |
858 | ||
11aa9c28 | 859 | sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto, kern); |
6257ff21 | 860 | if (sk == NULL) |
1da177e4 LT |
861 | return -ENOMEM; |
862 | ||
3200392b | 863 | ax25 = ax25_sk(sk)->cb = ax25_create_cb(); |
1da177e4 LT |
864 | if (!ax25) { |
865 | sk_free(sk); | |
866 | return -ENOMEM; | |
867 | } | |
868 | ||
869 | sock_init_data(sock, sk); | |
870 | ||
871 | sk->sk_destruct = ax25_free_sock; | |
872 | sock->ops = &ax25_proto_ops; | |
873 | sk->sk_protocol = protocol; | |
874 | ||
875 | ax25->sk = sk; | |
876 | ||
877 | return 0; | |
878 | } | |
879 | ||
880 | struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev) | |
881 | { | |
882 | struct sock *sk; | |
883 | ax25_cb *ax25, *oax25; | |
884 | ||
11aa9c28 | 885 | sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot, 0); |
6257ff21 | 886 | if (sk == NULL) |
1da177e4 LT |
887 | return NULL; |
888 | ||
889 | if ((ax25 = ax25_create_cb()) == NULL) { | |
890 | sk_free(sk); | |
891 | return NULL; | |
892 | } | |
893 | ||
894 | switch (osk->sk_type) { | |
895 | case SOCK_DGRAM: | |
896 | break; | |
897 | case SOCK_SEQPACKET: | |
898 | break; | |
899 | default: | |
900 | sk_free(sk); | |
901 | ax25_cb_put(ax25); | |
902 | return NULL; | |
903 | } | |
904 | ||
905 | sock_init_data(NULL, sk); | |
906 | ||
1da177e4 | 907 | sk->sk_type = osk->sk_type; |
1da177e4 LT |
908 | sk->sk_priority = osk->sk_priority; |
909 | sk->sk_protocol = osk->sk_protocol; | |
910 | sk->sk_rcvbuf = osk->sk_rcvbuf; | |
911 | sk->sk_sndbuf = osk->sk_sndbuf; | |
912 | sk->sk_state = TCP_ESTABLISHED; | |
53b924b3 | 913 | sock_copy_flags(sk, osk); |
1da177e4 | 914 | |
3200392b | 915 | oax25 = sk_to_ax25(osk); |
1da177e4 LT |
916 | |
917 | ax25->modulus = oax25->modulus; | |
918 | ax25->backoff = oax25->backoff; | |
919 | ax25->pidincl = oax25->pidincl; | |
920 | ax25->iamdigi = oax25->iamdigi; | |
921 | ax25->rtt = oax25->rtt; | |
922 | ax25->t1 = oax25->t1; | |
923 | ax25->t2 = oax25->t2; | |
924 | ax25->t3 = oax25->t3; | |
925 | ax25->n2 = oax25->n2; | |
926 | ax25->idle = oax25->idle; | |
927 | ax25->paclen = oax25->paclen; | |
928 | ax25->window = oax25->window; | |
929 | ||
930 | ax25->ax25_dev = ax25_dev; | |
931 | ax25->source_addr = oax25->source_addr; | |
932 | ||
933 | if (oax25->digipeat != NULL) { | |
0459d70a ACM |
934 | ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi), |
935 | GFP_ATOMIC); | |
936 | if (ax25->digipeat == NULL) { | |
1da177e4 LT |
937 | sk_free(sk); |
938 | ax25_cb_put(ax25); | |
939 | return NULL; | |
940 | } | |
1da177e4 LT |
941 | } |
942 | ||
3200392b | 943 | ax25_sk(sk)->cb = ax25; |
8c185ab6 | 944 | sk->sk_destruct = ax25_free_sock; |
1da177e4 LT |
945 | ax25->sk = sk; |
946 | ||
947 | return sk; | |
948 | } | |
949 | ||
950 | static int ax25_release(struct socket *sock) | |
951 | { | |
952 | struct sock *sk = sock->sk; | |
953 | ax25_cb *ax25; | |
954 | ||
955 | if (sk == NULL) | |
956 | return 0; | |
957 | ||
958 | sock_hold(sk); | |
959 | sock_orphan(sk); | |
960 | lock_sock(sk); | |
3200392b | 961 | ax25 = sk_to_ax25(sk); |
1da177e4 LT |
962 | |
963 | if (sk->sk_type == SOCK_SEQPACKET) { | |
964 | switch (ax25->state) { | |
965 | case AX25_STATE_0: | |
966 | release_sock(sk); | |
967 | ax25_disconnect(ax25, 0); | |
968 | lock_sock(sk); | |
969 | ax25_destroy_socket(ax25); | |
970 | break; | |
971 | ||
972 | case AX25_STATE_1: | |
973 | case AX25_STATE_2: | |
974 | ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); | |
975 | release_sock(sk); | |
976 | ax25_disconnect(ax25, 0); | |
977 | lock_sock(sk); | |
4a7d99ea BG |
978 | if (!sock_flag(ax25->sk, SOCK_DESTROY)) |
979 | ax25_destroy_socket(ax25); | |
1da177e4 LT |
980 | break; |
981 | ||
982 | case AX25_STATE_3: | |
983 | case AX25_STATE_4: | |
984 | ax25_clear_queues(ax25); | |
985 | ax25->n2count = 0; | |
986 | ||
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, | |
991 | AX25_DISC, | |
992 | AX25_POLLON, | |
993 | AX25_COMMAND); | |
994 | ax25_stop_t2timer(ax25); | |
995 | ax25_stop_t3timer(ax25); | |
996 | ax25_stop_idletimer(ax25); | |
997 | break; | |
998 | #ifdef CONFIG_AX25_DAMA_SLAVE | |
999 | case AX25_PROTO_DAMA_SLAVE: | |
1000 | ax25_stop_t3timer(ax25); | |
1001 | ax25_stop_idletimer(ax25); | |
1002 | break; | |
1003 | #endif | |
1004 | } | |
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); | |
1012 | break; | |
1013 | ||
1014 | default: | |
1015 | break; | |
1016 | } | |
1017 | } else { | |
1018 | sk->sk_state = TCP_CLOSE; | |
1019 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1020 | sk->sk_state_change(sk); | |
1021 | ax25_destroy_socket(ax25); | |
1022 | } | |
1023 | ||
1024 | sock->sk = NULL; | |
1025 | release_sock(sk); | |
1026 | sock_put(sk); | |
1027 | ||
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | /* | |
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. | |
1036 | */ | |
1037 | static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1038 | { | |
1039 | struct sock *sk = sock->sk; | |
1040 | struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; | |
1041 | ax25_dev *ax25_dev = NULL; | |
01d7dd0e RB |
1042 | ax25_uid_assoc *user; |
1043 | ax25_address call; | |
1da177e4 LT |
1044 | ax25_cb *ax25; |
1045 | int err = 0; | |
1046 | ||
1047 | if (addr_len != sizeof(struct sockaddr_ax25) && | |
1987e7b4 | 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. | |
1051 | */ | |
1da177e4 | 1052 | if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || |
1987e7b4 | 1053 | (addr_len > sizeof(struct full_sockaddr_ax25))) |
1da177e4 | 1054 | return -EINVAL; |
1da177e4 LT |
1055 | |
1056 | if (addr->fsa_ax25.sax25_family != AF_AX25) | |
1057 | return -EINVAL; | |
1058 | ||
73400407 | 1059 | user = ax25_findbyuid(current_euid()); |
01d7dd0e RB |
1060 | if (user) { |
1061 | call = user->call; | |
1062 | ax25_uid_put(user); | |
1063 | } else { | |
1064 | if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) | |
1065 | return -EACCES; | |
1066 | ||
1067 | call = addr->fsa_ax25.sax25_call; | |
1da177e4 LT |
1068 | } |
1069 | ||
1070 | lock_sock(sk); | |
1071 | ||
3200392b | 1072 | ax25 = sk_to_ax25(sk); |
1da177e4 LT |
1073 | if (!sock_flag(sk, SOCK_ZAPPED)) { |
1074 | err = -EINVAL; | |
1075 | goto out; | |
1076 | } | |
1077 | ||
01d7dd0e | 1078 | ax25->source_addr = call; |
1da177e4 LT |
1079 | |
1080 | /* | |
1081 | * User already set interface with SO_BINDTODEVICE | |
1082 | */ | |
1083 | if (ax25->ax25_dev != NULL) | |
1084 | goto done; | |
1085 | ||
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; | |
1090 | goto out; | |
1091 | } | |
1092 | } else { | |
1093 | if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) { | |
1094 | err = -EADDRNOTAVAIL; | |
1095 | goto out; | |
1096 | } | |
1097 | } | |
1098 | ||
1099 | if (ax25_dev != NULL) | |
1100 | ax25_fillin_cb(ax25, ax25_dev); | |
1101 | ||
1102 | done: | |
1103 | ax25_cb_add(ax25); | |
1104 | sock_reset_flag(sk, SOCK_ZAPPED); | |
1105 | ||
1106 | out: | |
1107 | release_sock(sk); | |
1108 | ||
49339cca | 1109 | return err; |
1da177e4 LT |
1110 | } |
1111 | ||
1112 | /* | |
1113 | * FIXME: nonblock behaviour looks like it may have a bug. | |
1114 | */ | |
c9266b99 RB |
1115 | static int __must_check ax25_connect(struct socket *sock, |
1116 | struct sockaddr *uaddr, int addr_len, int flags) | |
1da177e4 LT |
1117 | { |
1118 | struct sock *sk = sock->sk; | |
3200392b | 1119 | ax25_cb *ax25 = sk_to_ax25(sk), *ax25t; |
1da177e4 LT |
1120 | struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr; |
1121 | ax25_digi *digi = NULL; | |
1122 | int ct = 0, err = 0; | |
1123 | ||
1124 | /* | |
1125 | * some sanity checks. code further down depends on this | |
1126 | */ | |
1127 | ||
27d1cba2 | 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 | |
1131 | */ | |
1132 | ; | |
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. | |
1136 | */ | |
1da177e4 | 1137 | if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || |
27d1cba2 | 1138 | (addr_len > sizeof(struct full_sockaddr_ax25))) |
1da177e4 | 1139 | return -EINVAL; |
1da177e4 | 1140 | |
1da177e4 LT |
1141 | |
1142 | if (fsa->fsa_ax25.sax25_family != AF_AX25) | |
1143 | return -EINVAL; | |
1144 | ||
1145 | lock_sock(sk); | |
1146 | ||
1147 | /* deal with restarts */ | |
1148 | if (sock->state == SS_CONNECTING) { | |
1149 | switch (sk->sk_state) { | |
1150 | case TCP_SYN_SENT: /* still trying */ | |
1151 | err = -EINPROGRESS; | |
75606dc6 | 1152 | goto out_release; |
1da177e4 LT |
1153 | |
1154 | case TCP_ESTABLISHED: /* connection established */ | |
1155 | sock->state = SS_CONNECTED; | |
75606dc6 | 1156 | goto out_release; |
1da177e4 LT |
1157 | |
1158 | case TCP_CLOSE: /* connection refused */ | |
1159 | sock->state = SS_UNCONNECTED; | |
1160 | err = -ECONNREFUSED; | |
75606dc6 | 1161 | goto out_release; |
1da177e4 LT |
1162 | } |
1163 | } | |
1164 | ||
1165 | if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) { | |
1166 | err = -EISCONN; /* No reconnect on a seqpacket socket */ | |
75606dc6 | 1167 | goto out_release; |
1da177e4 LT |
1168 | } |
1169 | ||
1170 | sk->sk_state = TCP_CLOSE; | |
1171 | sock->state = SS_UNCONNECTED; | |
1172 | ||
a51482bd JJ |
1173 | kfree(ax25->digipeat); |
1174 | ax25->digipeat = NULL; | |
1da177e4 LT |
1175 | |
1176 | /* | |
1177 | * Handle digi-peaters to be used. | |
1178 | */ | |
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) { | |
1183 | err = -EINVAL; | |
75606dc6 | 1184 | goto out_release; |
1da177e4 LT |
1185 | } |
1186 | ||
1187 | if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) { | |
1188 | err = -ENOBUFS; | |
75606dc6 | 1189 | goto out_release; |
1da177e4 LT |
1190 | } |
1191 | ||
1192 | digi->ndigi = fsa->fsa_ax25.sax25_ndigis; | |
1193 | digi->lastrepeat = -1; | |
1194 | ||
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; | |
1200 | } else { | |
1201 | digi->repeated[ct] = 0; | |
1202 | } | |
1203 | digi->calls[ct] = fsa->fsa_digipeater[ct]; | |
1204 | ct++; | |
1205 | } | |
1206 | } | |
1207 | ||
1208 | /* | |
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. | |
1212 | */ | |
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", | |
1216 | current->comm); | |
1217 | if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) { | |
1218 | kfree(digi); | |
75606dc6 | 1219 | goto out_release; |
1da177e4 LT |
1220 | } |
1221 | ||
1222 | ax25_fillin_cb(ax25, ax25->ax25_dev); | |
1223 | ax25_cb_add(ax25); | |
1224 | } else { | |
1225 | if (ax25->ax25_dev == NULL) { | |
1226 | kfree(digi); | |
1227 | err = -EHOSTUNREACH; | |
75606dc6 | 1228 | goto out_release; |
1da177e4 LT |
1229 | } |
1230 | } | |
1231 | ||
1232 | if (sk->sk_type == SOCK_SEQPACKET && | |
1233 | (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi, | |
528930b9 | 1234 | ax25->ax25_dev->dev))) { |
1da177e4 LT |
1235 | kfree(digi); |
1236 | err = -EADDRINUSE; /* Already such a connection */ | |
1237 | ax25_cb_put(ax25t); | |
75606dc6 | 1238 | goto out_release; |
1da177e4 LT |
1239 | } |
1240 | ||
1241 | ax25->dest_addr = fsa->fsa_ax25.sax25_call; | |
1242 | ax25->digipeat = digi; | |
1243 | ||
1244 | /* First the easy one */ | |
1245 | if (sk->sk_type != SOCK_SEQPACKET) { | |
1246 | sock->state = SS_CONNECTED; | |
1247 | sk->sk_state = TCP_ESTABLISHED; | |
75606dc6 | 1248 | goto out_release; |
1da177e4 LT |
1249 | } |
1250 | ||
1251 | /* Move to connecting socket, ax.25 lapb WAIT_UA.. */ | |
1252 | sock->state = SS_CONNECTING; | |
1253 | sk->sk_state = TCP_SYN_SENT; | |
1254 | ||
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); | |
1259 | break; | |
1260 | ||
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); | |
1267 | else | |
1268 | ax25_std_establish_data_link(ax25); | |
1269 | break; | |
1270 | #endif | |
1271 | } | |
1272 | ||
1273 | ax25->state = AX25_STATE_1; | |
1274 | ||
1275 | ax25_start_heartbeat(ax25); | |
1276 | ||
1277 | /* Now the loop */ | |
1278 | if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { | |
1279 | err = -EINPROGRESS; | |
75606dc6 | 1280 | goto out_release; |
1da177e4 LT |
1281 | } |
1282 | ||
1283 | if (sk->sk_state == TCP_SYN_SENT) { | |
75606dc6 | 1284 | DEFINE_WAIT(wait); |
1da177e4 | 1285 | |
1da177e4 | 1286 | for (;;) { |
aa395145 | 1287 | prepare_to_wait(sk_sleep(sk), &wait, |
bd3b071b | 1288 | TASK_INTERRUPTIBLE); |
1da177e4 LT |
1289 | if (sk->sk_state != TCP_SYN_SENT) |
1290 | break; | |
75606dc6 RB |
1291 | if (!signal_pending(current)) { |
1292 | release_sock(sk); | |
1da177e4 LT |
1293 | schedule(); |
1294 | lock_sock(sk); | |
1295 | continue; | |
1296 | } | |
75606dc6 RB |
1297 | err = -ERESTARTSYS; |
1298 | break; | |
1da177e4 | 1299 | } |
aa395145 | 1300 | finish_wait(sk_sleep(sk), &wait); |
75606dc6 RB |
1301 | |
1302 | if (err) | |
1303 | goto out_release; | |
1da177e4 LT |
1304 | } |
1305 | ||
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 */ | |
75606dc6 | 1310 | goto out_release; |
1da177e4 LT |
1311 | } |
1312 | ||
1313 | sock->state = SS_CONNECTED; | |
1314 | ||
75606dc6 RB |
1315 | err = 0; |
1316 | out_release: | |
1da177e4 LT |
1317 | release_sock(sk); |
1318 | ||
1319 | return err; | |
1320 | } | |
1321 | ||
cdfbabfb DH |
1322 | static int ax25_accept(struct socket *sock, struct socket *newsock, int flags, |
1323 | bool kern) | |
1da177e4 | 1324 | { |
1da177e4 LT |
1325 | struct sk_buff *skb; |
1326 | struct sock *newsk; | |
75606dc6 | 1327 | DEFINE_WAIT(wait); |
1da177e4 LT |
1328 | struct sock *sk; |
1329 | int err = 0; | |
1330 | ||
1331 | if (sock->state != SS_UNCONNECTED) | |
1332 | return -EINVAL; | |
1333 | ||
1334 | if ((sk = sock->sk) == NULL) | |
1335 | return -EINVAL; | |
1336 | ||
1337 | lock_sock(sk); | |
1338 | if (sk->sk_type != SOCK_SEQPACKET) { | |
1339 | err = -EOPNOTSUPP; | |
1340 | goto out; | |
1341 | } | |
1342 | ||
1343 | if (sk->sk_state != TCP_LISTEN) { | |
1344 | err = -EINVAL; | |
1345 | goto out; | |
1346 | } | |
1347 | ||
1348 | /* | |
1349 | * The read queue this time is holding sockets ready to use | |
1350 | * hooked into the SABM we saved | |
1351 | */ | |
1da177e4 | 1352 | for (;;) { |
aa395145 | 1353 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1354 | skb = skb_dequeue(&sk->sk_receive_queue); |
1355 | if (skb) | |
1356 | break; | |
1357 | ||
1da177e4 | 1358 | if (flags & O_NONBLOCK) { |
75606dc6 RB |
1359 | err = -EWOULDBLOCK; |
1360 | break; | |
1da177e4 | 1361 | } |
75606dc6 RB |
1362 | if (!signal_pending(current)) { |
1363 | release_sock(sk); | |
1da177e4 LT |
1364 | schedule(); |
1365 | lock_sock(sk); | |
1366 | continue; | |
1367 | } | |
75606dc6 RB |
1368 | err = -ERESTARTSYS; |
1369 | break; | |
1da177e4 | 1370 | } |
aa395145 | 1371 | finish_wait(sk_sleep(sk), &wait); |
75606dc6 RB |
1372 | |
1373 | if (err) | |
1374 | goto out; | |
1da177e4 LT |
1375 | |
1376 | newsk = skb->sk; | |
9375cb8a | 1377 | sock_graft(newsk, newsock); |
1da177e4 LT |
1378 | |
1379 | /* Now attach up the new socket */ | |
1380 | kfree_skb(skb); | |
1381 | sk->sk_ack_backlog--; | |
1da177e4 LT |
1382 | newsock->state = SS_CONNECTED; |
1383 | ||
1384 | out: | |
1385 | release_sock(sk); | |
1386 | ||
1387 | return err; | |
1388 | } | |
1389 | ||
1390 | static int ax25_getname(struct socket *sock, struct sockaddr *uaddr, | |
9b2c45d4 | 1391 | int peer) |
1da177e4 LT |
1392 | { |
1393 | struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr; | |
1394 | struct sock *sk = sock->sk; | |
1395 | unsigned char ndigi, i; | |
1396 | ax25_cb *ax25; | |
1397 | int err = 0; | |
1398 | ||
5b919f83 | 1399 | memset(fsa, 0, sizeof(*fsa)); |
1da177e4 | 1400 | lock_sock(sk); |
3200392b | 1401 | ax25 = sk_to_ax25(sk); |
1da177e4 LT |
1402 | |
1403 | if (peer != 0) { | |
1404 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1405 | err = -ENOTCONN; | |
1406 | goto out; | |
1407 | } | |
1408 | ||
1409 | fsa->fsa_ax25.sax25_family = AF_AX25; | |
1410 | fsa->fsa_ax25.sax25_call = ax25->dest_addr; | |
1da177e4 LT |
1411 | |
1412 | if (ax25->digipeat != NULL) { | |
1413 | ndigi = ax25->digipeat->ndigi; | |
1414 | fsa->fsa_ax25.sax25_ndigis = ndigi; | |
1415 | for (i = 0; i < ndigi; i++) | |
1416 | fsa->fsa_digipeater[i] = | |
1417 | ax25->digipeat->calls[i]; | |
1418 | } | |
1419 | } else { | |
1420 | fsa->fsa_ax25.sax25_family = AF_AX25; | |
1421 | fsa->fsa_ax25.sax25_call = ax25->source_addr; | |
1422 | fsa->fsa_ax25.sax25_ndigis = 1; | |
1423 | if (ax25->ax25_dev != NULL) { | |
1424 | memcpy(&fsa->fsa_digipeater[0], | |
1425 | ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN); | |
1426 | } else { | |
1427 | fsa->fsa_digipeater[0] = null_ax25_address; | |
1428 | } | |
1429 | } | |
9b2c45d4 | 1430 | err = sizeof (struct full_sockaddr_ax25); |
1da177e4 LT |
1431 | |
1432 | out: | |
1433 | release_sock(sk); | |
1434 | ||
1435 | return err; | |
1436 | } | |
1437 | ||
1b784140 | 1438 | static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
1da177e4 | 1439 | { |
342dfc30 | 1440 | DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name); |
1da177e4 LT |
1441 | struct sock *sk = sock->sk; |
1442 | struct sockaddr_ax25 sax; | |
1443 | struct sk_buff *skb; | |
1444 | ax25_digi dtmp, *dp; | |
1da177e4 LT |
1445 | ax25_cb *ax25; |
1446 | size_t size; | |
1447 | int lv, err, addr_len = msg->msg_namelen; | |
1448 | ||
1449 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) | |
1450 | return -EINVAL; | |
1451 | ||
1452 | lock_sock(sk); | |
3200392b | 1453 | ax25 = sk_to_ax25(sk); |
1da177e4 LT |
1454 | |
1455 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
1456 | err = -EADDRNOTAVAIL; | |
1457 | goto out; | |
1458 | } | |
1459 | ||
1460 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
1461 | send_sig(SIGPIPE, current, 0); | |
1462 | err = -EPIPE; | |
1463 | goto out; | |
1464 | } | |
1465 | ||
1466 | if (ax25->ax25_dev == NULL) { | |
1467 | err = -ENETUNREACH; | |
1468 | goto out; | |
1469 | } | |
1470 | ||
1471 | if (len > ax25->ax25_dev->dev->mtu) { | |
1472 | err = -EMSGSIZE; | |
1473 | goto out; | |
1474 | } | |
528930b9 | 1475 | |
1da177e4 LT |
1476 | if (usax != NULL) { |
1477 | if (usax->sax25_family != AF_AX25) { | |
1478 | err = -EINVAL; | |
1479 | goto out; | |
1480 | } | |
1481 | ||
27d1cba2 | 1482 | if (addr_len == sizeof(struct sockaddr_ax25)) |
1483 | /* ax25_sendmsg(): uses obsolete socket structure */ | |
1484 | ; | |
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) | |
1488 | * socket structure. | |
1489 | */ | |
1da177e4 | 1490 | if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) || |
528930b9 YH |
1491 | (addr_len > sizeof(struct full_sockaddr_ax25))) { |
1492 | err = -EINVAL; | |
1da177e4 LT |
1493 | goto out; |
1494 | } | |
1495 | ||
1da177e4 LT |
1496 | |
1497 | if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) { | |
1498 | int ct = 0; | |
1499 | struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax; | |
1500 | ||
1501 | /* Valid number of digipeaters ? */ | |
1502 | if (usax->sax25_ndigis < 1 || usax->sax25_ndigis > AX25_MAX_DIGIS) { | |
1503 | err = -EINVAL; | |
1504 | goto out; | |
1505 | } | |
1506 | ||
1507 | dtmp.ndigi = usax->sax25_ndigis; | |
1508 | ||
1509 | while (ct < usax->sax25_ndigis) { | |
1510 | dtmp.repeated[ct] = 0; | |
1511 | dtmp.calls[ct] = fsa->fsa_digipeater[ct]; | |
1512 | ct++; | |
1513 | } | |
1514 | ||
1515 | dtmp.lastrepeat = 0; | |
1516 | } | |
1517 | ||
1518 | sax = *usax; | |
1519 | if (sk->sk_type == SOCK_SEQPACKET && | |
1520 | ax25cmp(&ax25->dest_addr, &sax.sax25_call)) { | |
1521 | err = -EISCONN; | |
1522 | goto out; | |
1523 | } | |
1524 | if (usax->sax25_ndigis == 0) | |
1525 | dp = NULL; | |
1526 | else | |
1527 | dp = &dtmp; | |
1528 | } else { | |
1529 | /* | |
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 | |
1533 | */ | |
1534 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1535 | err = -ENOTCONN; | |
1536 | goto out; | |
1537 | } | |
1538 | sax.sax25_family = AF_AX25; | |
1539 | sax.sax25_call = ax25->dest_addr; | |
1540 | dp = ax25->digipeat; | |
1541 | } | |
1542 | ||
1da177e4 | 1543 | /* Build a packet */ |
1da177e4 LT |
1544 | /* Assume the worst case */ |
1545 | size = len + ax25->ax25_dev->dev->hard_header_len; | |
1546 | ||
1547 | skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err); | |
1548 | if (skb == NULL) | |
1549 | goto out; | |
1550 | ||
1551 | skb_reserve(skb, size - len); | |
1552 | ||
1da177e4 | 1553 | /* User data follows immediately after the AX.25 data */ |
6ce8e9ce | 1554 | if (memcpy_from_msg(skb_put(skb, len), msg, len)) { |
1da177e4 LT |
1555 | err = -EFAULT; |
1556 | kfree_skb(skb); | |
1557 | goto out; | |
1558 | } | |
1559 | ||
c1d2bbe1 | 1560 | skb_reset_network_header(skb); |
1da177e4 LT |
1561 | |
1562 | /* Add the PID if one is not supplied by the user in the skb */ | |
967b05f6 | 1563 | if (!ax25->pidincl) |
d58ff351 | 1564 | *(u8 *)skb_push(skb, 1) = sk->sk_protocol; |
1da177e4 | 1565 | |
1da177e4 LT |
1566 | if (sk->sk_type == SOCK_SEQPACKET) { |
1567 | /* Connected mode sockets go via the LAPB machine */ | |
1568 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1569 | kfree_skb(skb); | |
1570 | err = -ENOTCONN; | |
1571 | goto out; | |
1572 | } | |
1573 | ||
1574 | /* Shove it onto the queue and kick */ | |
1575 | ax25_output(ax25, ax25->paclen, skb); | |
1576 | ||
1577 | err = len; | |
1578 | goto out; | |
1579 | } | |
1580 | ||
967b05f6 | 1581 | skb_push(skb, 1 + ax25_addr_size(dp)); |
1da177e4 | 1582 | |
8849b720 | 1583 | /* Building AX.25 Header */ |
1da177e4 LT |
1584 | |
1585 | /* Build an AX.25 header */ | |
967b05f6 ACM |
1586 | lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call, |
1587 | dp, AX25_COMMAND, AX25_MODULUS); | |
1da177e4 | 1588 | |
967b05f6 | 1589 | skb_set_transport_header(skb, lv); |
1da177e4 | 1590 | |
9c70220b | 1591 | *skb_transport_header(skb) = AX25_UI; |
1da177e4 LT |
1592 | |
1593 | /* Datagram frames go straight out of the door as UI */ | |
29c4be51 | 1594 | ax25_queue_xmit(skb, ax25->ax25_dev->dev); |
1da177e4 LT |
1595 | |
1596 | err = len; | |
1597 | ||
1598 | out: | |
1599 | release_sock(sk); | |
1600 | ||
1601 | return err; | |
1602 | } | |
1603 | ||
1b784140 YX |
1604 | static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1605 | int flags) | |
1da177e4 LT |
1606 | { |
1607 | struct sock *sk = sock->sk; | |
1608 | struct sk_buff *skb; | |
1609 | int copied; | |
1610 | int err = 0; | |
1611 | ||
1612 | lock_sock(sk); | |
1613 | /* | |
1614 | * This works for seqpacket too. The receiver has ordered the | |
1615 | * queue for us! We do one quick check first though | |
1616 | */ | |
1617 | if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) { | |
1618 | err = -ENOTCONN; | |
1619 | goto out; | |
1620 | } | |
1621 | ||
1622 | /* Now we can treat all alike */ | |
1623 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
528930b9 | 1624 | flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
1625 | if (skb == NULL) |
1626 | goto out; | |
1627 | ||
3200392b | 1628 | if (!sk_to_ax25(sk)->pidincl) |
1da177e4 LT |
1629 | skb_pull(skb, 1); /* Remove PID */ |
1630 | ||
badff6d0 ACM |
1631 | skb_reset_transport_header(skb); |
1632 | copied = skb->len; | |
1da177e4 LT |
1633 | |
1634 | if (copied > size) { | |
1635 | copied = size; | |
1636 | msg->msg_flags |= MSG_TRUNC; | |
1637 | } | |
1638 | ||
51f3d02b | 1639 | skb_copy_datagram_msg(skb, 0, msg, copied); |
1da177e4 | 1640 | |
f3d33426 | 1641 | if (msg->msg_name) { |
1da177e4 LT |
1642 | ax25_digi digi; |
1643 | ax25_address src; | |
98e399f8 | 1644 | const unsigned char *mac = skb_mac_header(skb); |
342dfc30 | 1645 | DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name); |
1da177e4 | 1646 | |
ef3313e8 | 1647 | memset(sax, 0, sizeof(struct full_sockaddr_ax25)); |
98e399f8 ACM |
1648 | ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL, |
1649 | &digi, NULL, NULL); | |
1da177e4 LT |
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; | |
1656 | ||
1657 | if (sax->sax25_ndigis != 0) { | |
1658 | int ct; | |
1659 | struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax; | |
1660 | ||
1661 | for (ct = 0; ct < digi.ndigi; ct++) | |
1662 | fsa->fsa_digipeater[ct] = digi.calls[ct]; | |
1663 | } | |
1664 | msg->msg_namelen = sizeof(struct full_sockaddr_ax25); | |
1665 | } | |
1666 | ||
1667 | skb_free_datagram(sk, skb); | |
1668 | err = copied; | |
1669 | ||
1670 | out: | |
1671 | release_sock(sk); | |
1672 | ||
1673 | return err; | |
1674 | } | |
1675 | ||
1676 | static int ax25_shutdown(struct socket *sk, int how) | |
1677 | { | |
1678 | /* FIXME - generate DM and RNR states */ | |
1679 | return -EOPNOTSUPP; | |
1680 | } | |
1681 | ||
1682 | static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1683 | { | |
1684 | struct sock *sk = sock->sk; | |
1685 | void __user *argp = (void __user *)arg; | |
1686 | int res = 0; | |
1687 | ||
1688 | lock_sock(sk); | |
1689 | switch (cmd) { | |
1690 | case TIOCOUTQ: { | |
1691 | long amount; | |
31e6d363 ED |
1692 | |
1693 | amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); | |
1da177e4 LT |
1694 | if (amount < 0) |
1695 | amount = 0; | |
1696 | res = put_user(amount, (int __user *)argp); | |
1697 | break; | |
1698 | } | |
1699 | ||
1700 | case TIOCINQ: { | |
1701 | struct sk_buff *skb; | |
1702 | long amount = 0L; | |
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) | |
1705 | amount = skb->len; | |
20b7d10a | 1706 | res = put_user(amount, (int __user *) argp); |
1da177e4 LT |
1707 | break; |
1708 | } | |
1709 | ||
1710 | case SIOCGSTAMP: | |
9b37ee75 | 1711 | res = sock_get_timestamp(sk, argp); |
1da177e4 LT |
1712 | break; |
1713 | ||
ae40eb1e ED |
1714 | case SIOCGSTAMPNS: |
1715 | res = sock_get_timestampns(sk, argp); | |
1716 | break; | |
1717 | ||
1da177e4 LT |
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))) { | |
1723 | res = -EFAULT; | |
1724 | break; | |
1725 | } | |
1726 | res = ax25_uid_ioctl(cmd, &sax25); | |
1727 | break; | |
1728 | } | |
1729 | ||
1730 | case SIOCAX25NOUID: { /* Set the default policy (default/bar) */ | |
1731 | long amount; | |
1732 | if (!capable(CAP_NET_ADMIN)) { | |
1733 | res = -EPERM; | |
1734 | break; | |
1735 | } | |
1736 | if (get_user(amount, (long __user *)argp)) { | |
1737 | res = -EFAULT; | |
1738 | break; | |
1739 | } | |
76887753 | 1740 | if (amount < 0 || amount > AX25_NOUID_BLOCK) { |
1da177e4 LT |
1741 | res = -EINVAL; |
1742 | break; | |
1743 | } | |
1744 | ax25_uid_policy = amount; | |
1745 | res = 0; | |
1746 | break; | |
1747 | } | |
1748 | ||
1749 | case SIOCADDRT: | |
1750 | case SIOCDELRT: | |
1751 | case SIOCAX25OPTRT: | |
1752 | if (!capable(CAP_NET_ADMIN)) { | |
1753 | res = -EPERM; | |
1754 | break; | |
1755 | } | |
1756 | res = ax25_rt_ioctl(cmd, argp); | |
1757 | break; | |
1758 | ||
1759 | case SIOCAX25CTLCON: | |
1760 | if (!capable(CAP_NET_ADMIN)) { | |
1761 | res = -EPERM; | |
1762 | break; | |
1763 | } | |
1764 | res = ax25_ctl_ioctl(cmd, argp); | |
1765 | break; | |
1766 | ||
1767 | case SIOCAX25GETINFO: | |
1768 | case SIOCAX25GETINFOOLD: { | |
3200392b | 1769 | ax25_cb *ax25 = sk_to_ax25(sk); |
1da177e4 LT |
1770 | struct ax25_info_struct ax25_info; |
1771 | ||
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; | |
407fc5cf ED |
1783 | ax25_info.rcv_q = sk_rmem_alloc_get(sk); |
1784 | ax25_info.snd_q = sk_wmem_alloc_get(sk); | |
1da177e4 LT |
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; | |
1791 | ||
1792 | /* old structure? */ | |
1793 | if (cmd == SIOCAX25GETINFOOLD) { | |
1794 | static int warned = 0; | |
1795 | if (!warned) { | |
1796 | printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n", | |
1797 | current->comm); | |
1798 | warned=1; | |
1799 | } | |
1800 | ||
1801 | if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) { | |
1802 | res = -EFAULT; | |
1803 | break; | |
1804 | } | |
1805 | } else { | |
1806 | if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) { | |
1807 | res = -EINVAL; | |
1808 | break; | |
1809 | } | |
1810 | } | |
1811 | res = 0; | |
1812 | break; | |
1813 | } | |
1814 | ||
1815 | case SIOCAX25ADDFWD: | |
1816 | case SIOCAX25DELFWD: { | |
1817 | struct ax25_fwd_struct ax25_fwd; | |
1818 | if (!capable(CAP_NET_ADMIN)) { | |
1819 | res = -EPERM; | |
1820 | break; | |
1821 | } | |
1822 | if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) { | |
1823 | res = -EFAULT; | |
1824 | break; | |
1825 | } | |
1826 | res = ax25_fwd_ioctl(cmd, &ax25_fwd); | |
1827 | break; | |
1828 | } | |
1829 | ||
1830 | case SIOCGIFADDR: | |
1831 | case SIOCSIFADDR: | |
1832 | case SIOCGIFDSTADDR: | |
1833 | case SIOCSIFDSTADDR: | |
1834 | case SIOCGIFBRDADDR: | |
1835 | case SIOCSIFBRDADDR: | |
1836 | case SIOCGIFNETMASK: | |
1837 | case SIOCSIFNETMASK: | |
1838 | case SIOCGIFMETRIC: | |
1839 | case SIOCSIFMETRIC: | |
1840 | res = -EINVAL; | |
1841 | break; | |
1842 | ||
1843 | default: | |
b5e5fa5e | 1844 | res = -ENOIOCTLCMD; |
1da177e4 LT |
1845 | break; |
1846 | } | |
1847 | release_sock(sk); | |
1848 | ||
1849 | return res; | |
1850 | } | |
1851 | ||
1852 | #ifdef CONFIG_PROC_FS | |
1853 | ||
1854 | static void *ax25_info_start(struct seq_file *seq, loff_t *pos) | |
f16f3026 | 1855 | __acquires(ax25_list_lock) |
1da177e4 | 1856 | { |
1da177e4 | 1857 | spin_lock_bh(&ax25_list_lock); |
b512f3d8 | 1858 | return seq_hlist_start(&ax25_list, *pos); |
1da177e4 LT |
1859 | } |
1860 | ||
1861 | static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos) | |
1862 | { | |
b512f3d8 | 1863 | return seq_hlist_next(v, &ax25_list, pos); |
1da177e4 | 1864 | } |
528930b9 | 1865 | |
1da177e4 | 1866 | static void ax25_info_stop(struct seq_file *seq, void *v) |
f16f3026 | 1867 | __releases(ax25_list_lock) |
1da177e4 LT |
1868 | { |
1869 | spin_unlock_bh(&ax25_list_lock); | |
1870 | } | |
1871 | ||
1872 | static int ax25_info_show(struct seq_file *seq, void *v) | |
1873 | { | |
b512f3d8 | 1874 | ax25_cb *ax25 = hlist_entry(v, struct ax25_cb, ax25_node); |
f75268cd | 1875 | char buf[11]; |
1da177e4 LT |
1876 | int k; |
1877 | ||
1878 | ||
1879 | /* | |
1880 | * New format: | |
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 | |
1882 | */ | |
1883 | ||
1884 | seq_printf(seq, "%8.8lx %s %s%s ", | |
1885 | (long) ax25, | |
1886 | ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name, | |
f75268cd | 1887 | ax2asc(buf, &ax25->source_addr), |
1da177e4 | 1888 | ax25->iamdigi? "*":""); |
f75268cd | 1889 | seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr)); |
1da177e4 LT |
1890 | |
1891 | for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) { | |
1892 | seq_printf(seq, ",%s%s", | |
f75268cd | 1893 | ax2asc(buf, &ax25->digipeat->calls[k]), |
1da177e4 LT |
1894 | ax25->digipeat->repeated[k]? "*":""); |
1895 | } | |
1896 | ||
1897 | seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d", | |
1898 | ax25->state, | |
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, | |
1906 | ax25->rtt / HZ, | |
1907 | ax25->window, | |
1908 | ax25->paclen); | |
1909 | ||
1910 | if (ax25->sk != NULL) { | |
1105b5d1 | 1911 | seq_printf(seq, " %d %d %lu\n", |
31e6d363 ED |
1912 | sk_wmem_alloc_get(ax25->sk), |
1913 | sk_rmem_alloc_get(ax25->sk), | |
1105b5d1 | 1914 | sock_i_ino(ax25->sk)); |
1da177e4 LT |
1915 | } else { |
1916 | seq_puts(seq, " * * *\n"); | |
1917 | } | |
1918 | return 0; | |
1919 | } | |
1920 | ||
56b3d975 | 1921 | static const struct seq_operations ax25_info_seqops = { |
1da177e4 LT |
1922 | .start = ax25_info_start, |
1923 | .next = ax25_info_next, | |
1924 | .stop = ax25_info_stop, | |
1925 | .show = ax25_info_show, | |
1926 | }; | |
1927 | ||
1928 | static int ax25_info_open(struct inode *inode, struct file *file) | |
1929 | { | |
1930 | return seq_open(file, &ax25_info_seqops); | |
1931 | } | |
1932 | ||
9a32144e | 1933 | static const struct file_operations ax25_info_fops = { |
1da177e4 LT |
1934 | .open = ax25_info_open, |
1935 | .read = seq_read, | |
1936 | .llseek = seq_lseek, | |
1937 | .release = seq_release, | |
1938 | }; | |
1939 | ||
1940 | #endif | |
1941 | ||
ec1b4cf7 | 1942 | static const struct net_proto_family ax25_family_ops = { |
1da177e4 LT |
1943 | .family = PF_AX25, |
1944 | .create = ax25_create, | |
1945 | .owner = THIS_MODULE, | |
1946 | }; | |
1947 | ||
90ddc4f0 | 1948 | static const struct proto_ops ax25_proto_ops = { |
4676356b RB |
1949 | .family = PF_AX25, |
1950 | .owner = THIS_MODULE, | |
1951 | .release = ax25_release, | |
1952 | .bind = ax25_bind, | |
1953 | .connect = ax25_connect, | |
1954 | .socketpair = sock_no_socketpair, | |
1955 | .accept = ax25_accept, | |
1956 | .getname = ax25_getname, | |
1957 | .poll = datagram_poll, | |
1958 | .ioctl = ax25_ioctl, | |
1959 | .listen = ax25_listen, | |
1960 | .shutdown = ax25_shutdown, | |
1961 | .setsockopt = ax25_setsockopt, | |
1962 | .getsockopt = ax25_getsockopt, | |
1963 | .sendmsg = ax25_sendmsg, | |
1964 | .recvmsg = ax25_recvmsg, | |
1965 | .mmap = sock_no_mmap, | |
1966 | .sendpage = sock_no_sendpage, | |
1da177e4 LT |
1967 | }; |
1968 | ||
1969 | /* | |
1970 | * Called by socket.c on kernel start up | |
1971 | */ | |
7546dd97 | 1972 | static struct packet_type ax25_packet_type __read_mostly = { |
09640e63 | 1973 | .type = cpu_to_be16(ETH_P_AX25), |
1da177e4 LT |
1974 | .func = ax25_kiss_rcv, |
1975 | }; | |
1976 | ||
1977 | static struct notifier_block ax25_dev_notifier = { | |
351638e7 | 1978 | .notifier_call = ax25_device_event, |
1da177e4 LT |
1979 | }; |
1980 | ||
1da177e4 LT |
1981 | static int __init ax25_init(void) |
1982 | { | |
1983 | int rc = proto_register(&ax25_proto, 0); | |
1984 | ||
1985 | if (rc != 0) | |
1986 | goto out; | |
1987 | ||
1988 | sock_register(&ax25_family_ops); | |
1989 | dev_add_pack(&ax25_packet_type); | |
1990 | register_netdevice_notifier(&ax25_dev_notifier); | |
1da177e4 | 1991 | |
d6444062 | 1992 | proc_create("ax25_route", 0444, init_net.proc_net, |
d4beaa66 | 1993 | &ax25_route_fops); |
d6444062 JP |
1994 | proc_create("ax25", 0444, init_net.proc_net, &ax25_info_fops); |
1995 | proc_create("ax25_calls", 0444, init_net.proc_net, &ax25_uid_fops); | |
1da177e4 LT |
1996 | out: |
1997 | return rc; | |
1998 | } | |
1999 | module_init(ax25_init); | |
2000 | ||
2001 | ||
2002 | MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); | |
2003 | MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol"); | |
2004 | MODULE_LICENSE("GPL"); | |
2005 | MODULE_ALIAS_NETPROTO(PF_AX25); | |
2006 | ||
2007 | static void __exit ax25_exit(void) | |
2008 | { | |
ece31ffd G |
2009 | remove_proc_entry("ax25_route", init_net.proc_net); |
2010 | remove_proc_entry("ax25", init_net.proc_net); | |
2011 | remove_proc_entry("ax25_calls", init_net.proc_net); | |
1da177e4 | 2012 | |
1da177e4 LT |
2013 | unregister_netdevice_notifier(&ax25_dev_notifier); |
2014 | ||
2015 | dev_remove_pack(&ax25_packet_type); | |
2016 | ||
2017 | sock_unregister(PF_AX25); | |
2018 | proto_unregister(&ax25_proto); | |
3adadc08 EB |
2019 | |
2020 | ax25_rt_free(); | |
2021 | ax25_uid_free(); | |
2022 | ax25_dev_free(); | |
1da177e4 LT |
2023 | } |
2024 | module_exit(ax25_exit); |