Commit | Line | Data |
---|---|---|
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 Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) | |
8 | * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) | |
9 | * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk) | |
10 | */ | |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/moduleparam.h> | |
4fc268d2 | 13 | #include <linux/capability.h> |
1da177e4 LT |
14 | #include <linux/errno.h> |
15 | #include <linux/types.h> | |
16 | #include <linux/socket.h> | |
17 | #include <linux/in.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 LT |
19 | #include <linux/kernel.h> |
20 | #include <linux/sched.h> | |
21 | #include <linux/timer.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/sockios.h> | |
24 | #include <linux/net.h> | |
25 | #include <linux/stat.h> | |
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> | |
457c4cbc | 31 | #include <net/net_namespace.h> |
1da177e4 | 32 | #include <net/sock.h> |
dc8e5416 | 33 | #include <linux/uaccess.h> |
1da177e4 LT |
34 | #include <linux/fcntl.h> |
35 | #include <linux/termios.h> /* For TIOCINQ/OUTQ */ | |
36 | #include <linux/mm.h> | |
37 | #include <linux/interrupt.h> | |
38 | #include <linux/notifier.h> | |
39 | #include <net/netrom.h> | |
40 | #include <linux/proc_fs.h> | |
41 | #include <linux/seq_file.h> | |
42 | #include <net/ip.h> | |
c752f073 | 43 | #include <net/tcp_states.h> |
1da177e4 LT |
44 | #include <net/arp.h> |
45 | #include <linux/init.h> | |
46 | ||
47 | static int nr_ndevs = 4; | |
48 | ||
49 | int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL; | |
50 | int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS; | |
51 | int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL; | |
52 | int sysctl_netrom_transport_timeout = NR_DEFAULT_T1; | |
53 | int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2; | |
54 | int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2; | |
55 | int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4; | |
56 | int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW; | |
57 | int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE; | |
58 | int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING; | |
59 | int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS; | |
e21ce8c7 | 60 | int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET; |
1da177e4 LT |
61 | |
62 | static unsigned short circuit = 0x101; | |
63 | ||
64 | static HLIST_HEAD(nr_list); | |
65 | static DEFINE_SPINLOCK(nr_list_lock); | |
66 | ||
90ddc4f0 | 67 | static const struct proto_ops nr_proto_ops; |
1da177e4 | 68 | |
4b260a98 RB |
69 | /* |
70 | * NETROM network devices are virtual network devices encapsulating NETROM | |
71 | * frames into AX.25 which will be sent through an AX.25 device, so form a | |
72 | * special "super class" of normal net devices; split their locks off into a | |
73 | * separate class since they always nest. | |
74 | */ | |
75 | static struct lock_class_key nr_netdev_xmit_lock_key; | |
cf508b12 | 76 | static struct lock_class_key nr_netdev_addr_lock_key; |
4b260a98 | 77 | |
e8a0464c DM |
78 | static void nr_set_lockdep_one(struct net_device *dev, |
79 | struct netdev_queue *txq, | |
80 | void *_unused) | |
c773e847 DM |
81 | { |
82 | lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key); | |
83 | } | |
84 | ||
85 | static void nr_set_lockdep_key(struct net_device *dev) | |
86 | { | |
cf508b12 | 87 | lockdep_set_class(&dev->addr_list_lock, &nr_netdev_addr_lock_key); |
e8a0464c | 88 | netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL); |
c773e847 DM |
89 | } |
90 | ||
1da177e4 LT |
91 | /* |
92 | * Socket removal during an interrupt is now safe. | |
93 | */ | |
94 | static void nr_remove_socket(struct sock *sk) | |
95 | { | |
96 | spin_lock_bh(&nr_list_lock); | |
97 | sk_del_node_init(sk); | |
98 | spin_unlock_bh(&nr_list_lock); | |
99 | } | |
100 | ||
101 | /* | |
102 | * Kill all bound sockets on a dropped device. | |
103 | */ | |
104 | static void nr_kill_by_device(struct net_device *dev) | |
105 | { | |
106 | struct sock *s; | |
1da177e4 LT |
107 | |
108 | spin_lock_bh(&nr_list_lock); | |
b67bfe0d | 109 | sk_for_each(s, &nr_list) |
1da177e4 LT |
110 | if (nr_sk(s)->device == dev) |
111 | nr_disconnect(s, ENETUNREACH); | |
112 | spin_unlock_bh(&nr_list_lock); | |
113 | } | |
114 | ||
115 | /* | |
116 | * Handle device status changes. | |
117 | */ | |
118 | static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
119 | { | |
351638e7 | 120 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
1da177e4 | 121 | |
721499e8 | 122 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
123 | return NOTIFY_DONE; |
124 | ||
1da177e4 LT |
125 | if (event != NETDEV_DOWN) |
126 | return NOTIFY_DONE; | |
127 | ||
128 | nr_kill_by_device(dev); | |
129 | nr_rt_device_down(dev); | |
5f8f59d6 | 130 | |
1da177e4 LT |
131 | return NOTIFY_DONE; |
132 | } | |
133 | ||
134 | /* | |
135 | * Add a socket to the bound sockets list. | |
136 | */ | |
137 | static void nr_insert_socket(struct sock *sk) | |
138 | { | |
139 | spin_lock_bh(&nr_list_lock); | |
140 | sk_add_node(sk, &nr_list); | |
141 | spin_unlock_bh(&nr_list_lock); | |
142 | } | |
143 | ||
144 | /* | |
145 | * Find a socket that wants to accept the Connect Request we just | |
146 | * received. | |
147 | */ | |
148 | static struct sock *nr_find_listener(ax25_address *addr) | |
149 | { | |
150 | struct sock *s; | |
1da177e4 LT |
151 | |
152 | spin_lock_bh(&nr_list_lock); | |
b67bfe0d | 153 | sk_for_each(s, &nr_list) |
1da177e4 LT |
154 | if (!ax25cmp(&nr_sk(s)->source_addr, addr) && |
155 | s->sk_state == TCP_LISTEN) { | |
5f8f59d6 | 156 | bh_lock_sock(s); |
1da177e4 LT |
157 | goto found; |
158 | } | |
159 | s = NULL; | |
160 | found: | |
161 | spin_unlock_bh(&nr_list_lock); | |
162 | return s; | |
163 | } | |
164 | ||
165 | /* | |
166 | * Find a connected NET/ROM socket given my circuit IDs. | |
167 | */ | |
168 | static struct sock *nr_find_socket(unsigned char index, unsigned char id) | |
169 | { | |
170 | struct sock *s; | |
1da177e4 LT |
171 | |
172 | spin_lock_bh(&nr_list_lock); | |
b67bfe0d | 173 | sk_for_each(s, &nr_list) { |
1da177e4 | 174 | struct nr_sock *nr = nr_sk(s); |
5f8f59d6 | 175 | |
1da177e4 LT |
176 | if (nr->my_index == index && nr->my_id == id) { |
177 | bh_lock_sock(s); | |
178 | goto found; | |
179 | } | |
180 | } | |
181 | s = NULL; | |
182 | found: | |
183 | spin_unlock_bh(&nr_list_lock); | |
184 | return s; | |
185 | } | |
186 | ||
187 | /* | |
188 | * Find a connected NET/ROM socket given their circuit IDs. | |
189 | */ | |
190 | static struct sock *nr_find_peer(unsigned char index, unsigned char id, | |
191 | ax25_address *dest) | |
192 | { | |
193 | struct sock *s; | |
1da177e4 LT |
194 | |
195 | spin_lock_bh(&nr_list_lock); | |
b67bfe0d | 196 | sk_for_each(s, &nr_list) { |
1da177e4 | 197 | struct nr_sock *nr = nr_sk(s); |
5f8f59d6 | 198 | |
1da177e4 LT |
199 | if (nr->your_index == index && nr->your_id == id && |
200 | !ax25cmp(&nr->dest_addr, dest)) { | |
5f8f59d6 | 201 | bh_lock_sock(s); |
1da177e4 LT |
202 | goto found; |
203 | } | |
204 | } | |
205 | s = NULL; | |
206 | found: | |
207 | spin_unlock_bh(&nr_list_lock); | |
208 | return s; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Find next free circuit ID. | |
213 | */ | |
214 | static unsigned short nr_find_next_circuit(void) | |
215 | { | |
216 | unsigned short id = circuit; | |
217 | unsigned char i, j; | |
218 | struct sock *sk; | |
219 | ||
220 | for (;;) { | |
221 | i = id / 256; | |
222 | j = id % 256; | |
223 | ||
224 | if (i != 0 && j != 0) { | |
225 | if ((sk=nr_find_socket(i, j)) == NULL) | |
226 | break; | |
227 | bh_unlock_sock(sk); | |
228 | } | |
229 | ||
230 | id++; | |
231 | } | |
232 | ||
233 | return id; | |
234 | } | |
235 | ||
236 | /* | |
237 | * Deferred destroy. | |
238 | */ | |
239 | void nr_destroy_socket(struct sock *); | |
240 | ||
241 | /* | |
242 | * Handler for deferred kills. | |
243 | */ | |
244 | static void nr_destroy_timer(unsigned long data) | |
245 | { | |
246 | struct sock *sk=(struct sock *)data; | |
247 | bh_lock_sock(sk); | |
248 | sock_hold(sk); | |
249 | nr_destroy_socket(sk); | |
250 | bh_unlock_sock(sk); | |
251 | sock_put(sk); | |
252 | } | |
253 | ||
254 | /* | |
255 | * This is called from user mode and the timers. Thus it protects itself | |
256 | * against interrupt users but doesn't worry about being called during | |
257 | * work. Once it is removed from the queue no interrupt or bottom half | |
258 | * will touch it and we are (fairly 8-) ) safe. | |
259 | */ | |
260 | void nr_destroy_socket(struct sock *sk) | |
261 | { | |
262 | struct sk_buff *skb; | |
263 | ||
264 | nr_remove_socket(sk); | |
265 | ||
266 | nr_stop_heartbeat(sk); | |
267 | nr_stop_t1timer(sk); | |
268 | nr_stop_t2timer(sk); | |
269 | nr_stop_t4timer(sk); | |
270 | nr_stop_idletimer(sk); | |
271 | ||
272 | nr_clear_queues(sk); /* Flush the queues */ | |
273 | ||
274 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
275 | if (skb->sk != sk) { /* A pending connection */ | |
276 | /* Queue the unaccepted socket for death */ | |
277 | sock_set_flag(skb->sk, SOCK_DEAD); | |
278 | nr_start_heartbeat(skb->sk); | |
279 | nr_sk(skb->sk)->state = NR_STATE_0; | |
280 | } | |
281 | ||
282 | kfree_skb(skb); | |
283 | } | |
284 | ||
c564039f | 285 | if (sk_has_allocations(sk)) { |
1da177e4 LT |
286 | /* Defer: outstanding buffers */ |
287 | sk->sk_timer.function = nr_destroy_timer; | |
288 | sk->sk_timer.expires = jiffies + 2 * HZ; | |
289 | add_timer(&sk->sk_timer); | |
290 | } else | |
291 | sock_put(sk); | |
292 | } | |
293 | ||
294 | /* | |
295 | * Handling for system calls applied via the various interfaces to a | |
296 | * NET/ROM socket object. | |
297 | */ | |
298 | ||
299 | static int nr_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 300 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
301 | { |
302 | struct sock *sk = sock->sk; | |
303 | struct nr_sock *nr = nr_sk(sk); | |
32288eb4 | 304 | unsigned long opt; |
1da177e4 LT |
305 | |
306 | if (level != SOL_NETROM) | |
307 | return -ENOPROTOOPT; | |
308 | ||
32288eb4 | 309 | if (optlen < sizeof(unsigned int)) |
1da177e4 LT |
310 | return -EINVAL; |
311 | ||
32288eb4 | 312 | if (get_user(opt, (unsigned int __user *)optval)) |
1da177e4 LT |
313 | return -EFAULT; |
314 | ||
315 | switch (optname) { | |
316 | case NETROM_T1: | |
32288eb4 | 317 | if (opt < 1 || opt > ULONG_MAX / HZ) |
1da177e4 LT |
318 | return -EINVAL; |
319 | nr->t1 = opt * HZ; | |
320 | return 0; | |
321 | ||
322 | case NETROM_T2: | |
32288eb4 | 323 | if (opt < 1 || opt > ULONG_MAX / HZ) |
1da177e4 LT |
324 | return -EINVAL; |
325 | nr->t2 = opt * HZ; | |
326 | return 0; | |
327 | ||
328 | case NETROM_N2: | |
329 | if (opt < 1 || opt > 31) | |
330 | return -EINVAL; | |
331 | nr->n2 = opt; | |
332 | return 0; | |
333 | ||
334 | case NETROM_T4: | |
32288eb4 | 335 | if (opt < 1 || opt > ULONG_MAX / HZ) |
1da177e4 LT |
336 | return -EINVAL; |
337 | nr->t4 = opt * HZ; | |
338 | return 0; | |
339 | ||
340 | case NETROM_IDLE: | |
32288eb4 | 341 | if (opt > ULONG_MAX / (60 * HZ)) |
1da177e4 LT |
342 | return -EINVAL; |
343 | nr->idle = opt * 60 * HZ; | |
344 | return 0; | |
345 | ||
346 | default: | |
347 | return -ENOPROTOOPT; | |
348 | } | |
349 | } | |
350 | ||
351 | static int nr_getsockopt(struct socket *sock, int level, int optname, | |
352 | char __user *optval, int __user *optlen) | |
353 | { | |
354 | struct sock *sk = sock->sk; | |
355 | struct nr_sock *nr = nr_sk(sk); | |
356 | int val = 0; | |
5f8f59d6 | 357 | int len; |
1da177e4 LT |
358 | |
359 | if (level != SOL_NETROM) | |
360 | return -ENOPROTOOPT; | |
5f8f59d6 | 361 | |
1da177e4 LT |
362 | if (get_user(len, optlen)) |
363 | return -EFAULT; | |
364 | ||
365 | if (len < 0) | |
366 | return -EINVAL; | |
5f8f59d6 | 367 | |
1da177e4 LT |
368 | switch (optname) { |
369 | case NETROM_T1: | |
370 | val = nr->t1 / HZ; | |
371 | break; | |
372 | ||
373 | case NETROM_T2: | |
374 | val = nr->t2 / HZ; | |
375 | break; | |
376 | ||
377 | case NETROM_N2: | |
378 | val = nr->n2; | |
379 | break; | |
380 | ||
381 | case NETROM_T4: | |
382 | val = nr->t4 / HZ; | |
383 | break; | |
384 | ||
385 | case NETROM_IDLE: | |
386 | val = nr->idle / (60 * HZ); | |
387 | break; | |
388 | ||
389 | default: | |
390 | return -ENOPROTOOPT; | |
391 | } | |
392 | ||
393 | len = min_t(unsigned int, len, sizeof(int)); | |
394 | ||
395 | if (put_user(len, optlen)) | |
396 | return -EFAULT; | |
397 | ||
398 | return copy_to_user(optval, &val, len) ? -EFAULT : 0; | |
399 | } | |
400 | ||
401 | static int nr_listen(struct socket *sock, int backlog) | |
402 | { | |
403 | struct sock *sk = sock->sk; | |
404 | ||
405 | lock_sock(sk); | |
406 | if (sk->sk_state != TCP_LISTEN) { | |
407 | memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN); | |
408 | sk->sk_max_ack_backlog = backlog; | |
409 | sk->sk_state = TCP_LISTEN; | |
410 | release_sock(sk); | |
411 | return 0; | |
412 | } | |
413 | release_sock(sk); | |
414 | ||
415 | return -EOPNOTSUPP; | |
416 | } | |
417 | ||
418 | static struct proto nr_proto = { | |
419 | .name = "NETROM", | |
420 | .owner = THIS_MODULE, | |
421 | .obj_size = sizeof(struct nr_sock), | |
422 | }; | |
423 | ||
3f378b68 EP |
424 | static int nr_create(struct net *net, struct socket *sock, int protocol, |
425 | int kern) | |
1da177e4 LT |
426 | { |
427 | struct sock *sk; | |
428 | struct nr_sock *nr; | |
429 | ||
09ad9bc7 | 430 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
431 | return -EAFNOSUPPORT; |
432 | ||
1da177e4 LT |
433 | if (sock->type != SOCK_SEQPACKET || protocol != 0) |
434 | return -ESOCKTNOSUPPORT; | |
435 | ||
11aa9c28 | 436 | sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto, kern); |
6257ff21 | 437 | if (sk == NULL) |
1da177e4 LT |
438 | return -ENOMEM; |
439 | ||
440 | nr = nr_sk(sk); | |
441 | ||
442 | sock_init_data(sock, sk); | |
443 | ||
444 | sock->ops = &nr_proto_ops; | |
445 | sk->sk_protocol = protocol; | |
446 | ||
447 | skb_queue_head_init(&nr->ack_queue); | |
448 | skb_queue_head_init(&nr->reseq_queue); | |
449 | skb_queue_head_init(&nr->frag_queue); | |
450 | ||
451 | nr_init_timers(sk); | |
452 | ||
4d8937d0 RB |
453 | nr->t1 = |
454 | msecs_to_jiffies(sysctl_netrom_transport_timeout); | |
455 | nr->t2 = | |
456 | msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay); | |
457 | nr->n2 = | |
458 | msecs_to_jiffies(sysctl_netrom_transport_maximum_tries); | |
459 | nr->t4 = | |
460 | msecs_to_jiffies(sysctl_netrom_transport_busy_delay); | |
461 | nr->idle = | |
462 | msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout); | |
1da177e4 LT |
463 | nr->window = sysctl_netrom_transport_requested_window_size; |
464 | ||
465 | nr->bpqext = 1; | |
466 | nr->state = NR_STATE_0; | |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
471 | static struct sock *nr_make_new(struct sock *osk) | |
472 | { | |
473 | struct sock *sk; | |
474 | struct nr_sock *nr, *onr; | |
475 | ||
476 | if (osk->sk_type != SOCK_SEQPACKET) | |
477 | return NULL; | |
478 | ||
11aa9c28 | 479 | sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot, 0); |
6257ff21 | 480 | if (sk == NULL) |
1da177e4 LT |
481 | return NULL; |
482 | ||
483 | nr = nr_sk(sk); | |
484 | ||
485 | sock_init_data(NULL, sk); | |
486 | ||
487 | sk->sk_type = osk->sk_type; | |
1da177e4 LT |
488 | sk->sk_priority = osk->sk_priority; |
489 | sk->sk_protocol = osk->sk_protocol; | |
490 | sk->sk_rcvbuf = osk->sk_rcvbuf; | |
491 | sk->sk_sndbuf = osk->sk_sndbuf; | |
492 | sk->sk_state = TCP_ESTABLISHED; | |
53b924b3 | 493 | sock_copy_flags(sk, osk); |
1da177e4 LT |
494 | |
495 | skb_queue_head_init(&nr->ack_queue); | |
496 | skb_queue_head_init(&nr->reseq_queue); | |
497 | skb_queue_head_init(&nr->frag_queue); | |
498 | ||
499 | nr_init_timers(sk); | |
500 | ||
501 | onr = nr_sk(osk); | |
502 | ||
503 | nr->t1 = onr->t1; | |
504 | nr->t2 = onr->t2; | |
505 | nr->n2 = onr->n2; | |
506 | nr->t4 = onr->t4; | |
507 | nr->idle = onr->idle; | |
508 | nr->window = onr->window; | |
509 | ||
510 | nr->device = onr->device; | |
511 | nr->bpqext = onr->bpqext; | |
512 | ||
513 | return sk; | |
514 | } | |
515 | ||
516 | static int nr_release(struct socket *sock) | |
517 | { | |
518 | struct sock *sk = sock->sk; | |
519 | struct nr_sock *nr; | |
520 | ||
521 | if (sk == NULL) return 0; | |
522 | ||
523 | sock_hold(sk); | |
859f4c74 | 524 | sock_orphan(sk); |
1da177e4 LT |
525 | lock_sock(sk); |
526 | nr = nr_sk(sk); | |
527 | ||
528 | switch (nr->state) { | |
529 | case NR_STATE_0: | |
530 | case NR_STATE_1: | |
531 | case NR_STATE_2: | |
532 | nr_disconnect(sk, 0); | |
533 | nr_destroy_socket(sk); | |
534 | break; | |
535 | ||
536 | case NR_STATE_3: | |
537 | nr_clear_queues(sk); | |
538 | nr->n2count = 0; | |
539 | nr_write_internal(sk, NR_DISCREQ); | |
540 | nr_start_t1timer(sk); | |
541 | nr_stop_t2timer(sk); | |
542 | nr_stop_t4timer(sk); | |
543 | nr_stop_idletimer(sk); | |
544 | nr->state = NR_STATE_2; | |
545 | sk->sk_state = TCP_CLOSE; | |
546 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
547 | sk->sk_state_change(sk); | |
1da177e4 | 548 | sock_set_flag(sk, SOCK_DESTROY); |
1da177e4 LT |
549 | break; |
550 | ||
551 | default: | |
1da177e4 LT |
552 | break; |
553 | } | |
554 | ||
5f8f59d6 | 555 | sock->sk = NULL; |
1da177e4 LT |
556 | release_sock(sk); |
557 | sock_put(sk); | |
558 | ||
559 | return 0; | |
560 | } | |
561 | ||
562 | static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
563 | { | |
564 | struct sock *sk = sock->sk; | |
565 | struct nr_sock *nr = nr_sk(sk); | |
566 | struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; | |
567 | struct net_device *dev; | |
01d7dd0e RB |
568 | ax25_uid_assoc *user; |
569 | ax25_address *source; | |
1da177e4 LT |
570 | |
571 | lock_sock(sk); | |
572 | if (!sock_flag(sk, SOCK_ZAPPED)) { | |
573 | release_sock(sk); | |
574 | return -EINVAL; | |
575 | } | |
576 | if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) { | |
577 | release_sock(sk); | |
578 | return -EINVAL; | |
579 | } | |
580 | if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) { | |
581 | release_sock(sk); | |
582 | return -EINVAL; | |
583 | } | |
584 | if (addr->fsa_ax25.sax25_family != AF_NETROM) { | |
585 | release_sock(sk); | |
586 | return -EINVAL; | |
587 | } | |
588 | if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) { | |
1da177e4 LT |
589 | release_sock(sk); |
590 | return -EADDRNOTAVAIL; | |
591 | } | |
592 | ||
593 | /* | |
594 | * Only the super user can set an arbitrary user callsign. | |
595 | */ | |
596 | if (addr->fsa_ax25.sax25_ndigis == 1) { | |
597 | if (!capable(CAP_NET_BIND_SERVICE)) { | |
598 | dev_put(dev); | |
599 | release_sock(sk); | |
bf5b30b8 | 600 | return -EPERM; |
1da177e4 LT |
601 | } |
602 | nr->user_addr = addr->fsa_digipeater[0]; | |
603 | nr->source_addr = addr->fsa_ax25.sax25_call; | |
604 | } else { | |
605 | source = &addr->fsa_ax25.sax25_call; | |
606 | ||
ba95b235 | 607 | user = ax25_findbyuid(current_euid()); |
01d7dd0e RB |
608 | if (user) { |
609 | nr->user_addr = user->call; | |
610 | ax25_uid_put(user); | |
611 | } else { | |
1da177e4 LT |
612 | if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { |
613 | release_sock(sk); | |
614 | dev_put(dev); | |
615 | return -EPERM; | |
616 | } | |
01d7dd0e | 617 | nr->user_addr = *source; |
1da177e4 LT |
618 | } |
619 | ||
1da177e4 LT |
620 | nr->source_addr = *source; |
621 | } | |
622 | ||
623 | nr->device = dev; | |
624 | nr_insert_socket(sk); | |
625 | ||
626 | sock_reset_flag(sk, SOCK_ZAPPED); | |
627 | dev_put(dev); | |
628 | release_sock(sk); | |
8849b720 | 629 | |
1da177e4 LT |
630 | return 0; |
631 | } | |
632 | ||
633 | static int nr_connect(struct socket *sock, struct sockaddr *uaddr, | |
634 | int addr_len, int flags) | |
635 | { | |
636 | struct sock *sk = sock->sk; | |
637 | struct nr_sock *nr = nr_sk(sk); | |
638 | struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr; | |
01d7dd0e RB |
639 | ax25_address *source = NULL; |
640 | ax25_uid_assoc *user; | |
1da177e4 | 641 | struct net_device *dev; |
75606dc6 | 642 | int err = 0; |
1da177e4 LT |
643 | |
644 | lock_sock(sk); | |
645 | if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { | |
646 | sock->state = SS_CONNECTED; | |
75606dc6 | 647 | goto out_release; /* Connect completed during a ERESTARTSYS event */ |
1da177e4 LT |
648 | } |
649 | ||
650 | if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { | |
651 | sock->state = SS_UNCONNECTED; | |
75606dc6 RB |
652 | err = -ECONNREFUSED; |
653 | goto out_release; | |
1da177e4 LT |
654 | } |
655 | ||
656 | if (sk->sk_state == TCP_ESTABLISHED) { | |
75606dc6 RB |
657 | err = -EISCONN; /* No reconnect on a seqpacket socket */ |
658 | goto out_release; | |
1da177e4 LT |
659 | } |
660 | ||
5f8f59d6 | 661 | sk->sk_state = TCP_CLOSE; |
1da177e4 LT |
662 | sock->state = SS_UNCONNECTED; |
663 | ||
664 | if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) { | |
75606dc6 RB |
665 | err = -EINVAL; |
666 | goto out_release; | |
1da177e4 LT |
667 | } |
668 | if (addr->sax25_family != AF_NETROM) { | |
75606dc6 RB |
669 | err = -EINVAL; |
670 | goto out_release; | |
1da177e4 LT |
671 | } |
672 | if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */ | |
673 | sock_reset_flag(sk, SOCK_ZAPPED); | |
674 | ||
675 | if ((dev = nr_dev_first()) == NULL) { | |
75606dc6 RB |
676 | err = -ENETUNREACH; |
677 | goto out_release; | |
1da177e4 LT |
678 | } |
679 | source = (ax25_address *)dev->dev_addr; | |
680 | ||
ba95b235 | 681 | user = ax25_findbyuid(current_euid()); |
01d7dd0e RB |
682 | if (user) { |
683 | nr->user_addr = user->call; | |
684 | ax25_uid_put(user); | |
685 | } else { | |
1da177e4 LT |
686 | if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) { |
687 | dev_put(dev); | |
75606dc6 RB |
688 | err = -EPERM; |
689 | goto out_release; | |
1da177e4 | 690 | } |
01d7dd0e | 691 | nr->user_addr = *source; |
1da177e4 LT |
692 | } |
693 | ||
1da177e4 LT |
694 | nr->source_addr = *source; |
695 | nr->device = dev; | |
696 | ||
697 | dev_put(dev); | |
698 | nr_insert_socket(sk); /* Finish the bind */ | |
699 | } | |
700 | ||
701 | nr->dest_addr = addr->sax25_call; | |
702 | ||
703 | release_sock(sk); | |
704 | circuit = nr_find_next_circuit(); | |
705 | lock_sock(sk); | |
706 | ||
707 | nr->my_index = circuit / 256; | |
708 | nr->my_id = circuit % 256; | |
709 | ||
710 | circuit++; | |
711 | ||
712 | /* Move to connecting socket, start sending Connect Requests */ | |
713 | sock->state = SS_CONNECTING; | |
714 | sk->sk_state = TCP_SYN_SENT; | |
715 | ||
716 | nr_establish_data_link(sk); | |
717 | ||
718 | nr->state = NR_STATE_1; | |
719 | ||
720 | nr_start_heartbeat(sk); | |
721 | ||
722 | /* Now the loop */ | |
723 | if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { | |
75606dc6 RB |
724 | err = -EINPROGRESS; |
725 | goto out_release; | |
1da177e4 | 726 | } |
5f8f59d6 | 727 | |
1da177e4 LT |
728 | /* |
729 | * A Connect Ack with Choke or timeout or failed routing will go to | |
730 | * closed. | |
731 | */ | |
732 | if (sk->sk_state == TCP_SYN_SENT) { | |
75606dc6 | 733 | DEFINE_WAIT(wait); |
1da177e4 | 734 | |
1da177e4 | 735 | for (;;) { |
aa395145 | 736 | prepare_to_wait(sk_sleep(sk), &wait, |
639fc4c3 | 737 | TASK_INTERRUPTIBLE); |
1da177e4 LT |
738 | if (sk->sk_state != TCP_SYN_SENT) |
739 | break; | |
75606dc6 RB |
740 | if (!signal_pending(current)) { |
741 | release_sock(sk); | |
1da177e4 LT |
742 | schedule(); |
743 | lock_sock(sk); | |
744 | continue; | |
745 | } | |
75606dc6 RB |
746 | err = -ERESTARTSYS; |
747 | break; | |
1da177e4 | 748 | } |
aa395145 | 749 | finish_wait(sk_sleep(sk), &wait); |
75606dc6 RB |
750 | if (err) |
751 | goto out_release; | |
1da177e4 LT |
752 | } |
753 | ||
754 | if (sk->sk_state != TCP_ESTABLISHED) { | |
755 | sock->state = SS_UNCONNECTED; | |
75606dc6 RB |
756 | err = sock_error(sk); /* Always set at this point */ |
757 | goto out_release; | |
1da177e4 LT |
758 | } |
759 | ||
760 | sock->state = SS_CONNECTED; | |
75606dc6 RB |
761 | |
762 | out_release: | |
1da177e4 LT |
763 | release_sock(sk); |
764 | ||
75606dc6 | 765 | return err; |
1da177e4 LT |
766 | } |
767 | ||
768 | static int nr_accept(struct socket *sock, struct socket *newsock, int flags) | |
769 | { | |
1da177e4 LT |
770 | struct sk_buff *skb; |
771 | struct sock *newsk; | |
75606dc6 | 772 | DEFINE_WAIT(wait); |
1da177e4 LT |
773 | struct sock *sk; |
774 | int err = 0; | |
775 | ||
776 | if ((sk = sock->sk) == NULL) | |
777 | return -EINVAL; | |
778 | ||
779 | lock_sock(sk); | |
780 | if (sk->sk_type != SOCK_SEQPACKET) { | |
781 | err = -EOPNOTSUPP; | |
75606dc6 | 782 | goto out_release; |
1da177e4 LT |
783 | } |
784 | ||
785 | if (sk->sk_state != TCP_LISTEN) { | |
786 | err = -EINVAL; | |
75606dc6 | 787 | goto out_release; |
1da177e4 LT |
788 | } |
789 | ||
790 | /* | |
791 | * The write queue this time is holding sockets ready to use | |
792 | * hooked into the SABM we saved | |
793 | */ | |
1da177e4 | 794 | for (;;) { |
aa395145 | 795 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
796 | skb = skb_dequeue(&sk->sk_receive_queue); |
797 | if (skb) | |
798 | break; | |
799 | ||
1da177e4 | 800 | if (flags & O_NONBLOCK) { |
75606dc6 RB |
801 | err = -EWOULDBLOCK; |
802 | break; | |
1da177e4 | 803 | } |
75606dc6 RB |
804 | if (!signal_pending(current)) { |
805 | release_sock(sk); | |
1da177e4 LT |
806 | schedule(); |
807 | lock_sock(sk); | |
808 | continue; | |
809 | } | |
75606dc6 RB |
810 | err = -ERESTARTSYS; |
811 | break; | |
1da177e4 | 812 | } |
aa395145 | 813 | finish_wait(sk_sleep(sk), &wait); |
75606dc6 RB |
814 | if (err) |
815 | goto out_release; | |
1da177e4 LT |
816 | |
817 | newsk = skb->sk; | |
7b66767f | 818 | sock_graft(newsk, newsock); |
1da177e4 LT |
819 | |
820 | /* Now attach up the new socket */ | |
821 | kfree_skb(skb); | |
18601a7d | 822 | sk_acceptq_removed(sk); |
1da177e4 | 823 | |
75606dc6 | 824 | out_release: |
1da177e4 | 825 | release_sock(sk); |
75606dc6 | 826 | |
1da177e4 LT |
827 | return err; |
828 | } | |
829 | ||
830 | static int nr_getname(struct socket *sock, struct sockaddr *uaddr, | |
831 | int *uaddr_len, int peer) | |
832 | { | |
833 | struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr; | |
834 | struct sock *sk = sock->sk; | |
835 | struct nr_sock *nr = nr_sk(sk); | |
836 | ||
7a3b6843 DC |
837 | memset(&sax->fsa_ax25, 0, sizeof(struct sockaddr_ax25)); |
838 | ||
1da177e4 LT |
839 | lock_sock(sk); |
840 | if (peer != 0) { | |
841 | if (sk->sk_state != TCP_ESTABLISHED) { | |
842 | release_sock(sk); | |
843 | return -ENOTCONN; | |
844 | } | |
845 | sax->fsa_ax25.sax25_family = AF_NETROM; | |
846 | sax->fsa_ax25.sax25_ndigis = 1; | |
847 | sax->fsa_ax25.sax25_call = nr->user_addr; | |
f6b97b29 | 848 | memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater)); |
1da177e4 LT |
849 | sax->fsa_digipeater[0] = nr->dest_addr; |
850 | *uaddr_len = sizeof(struct full_sockaddr_ax25); | |
851 | } else { | |
852 | sax->fsa_ax25.sax25_family = AF_NETROM; | |
853 | sax->fsa_ax25.sax25_ndigis = 0; | |
854 | sax->fsa_ax25.sax25_call = nr->source_addr; | |
855 | *uaddr_len = sizeof(struct sockaddr_ax25); | |
856 | } | |
857 | release_sock(sk); | |
858 | ||
859 | return 0; | |
860 | } | |
861 | ||
862 | int nr_rx_frame(struct sk_buff *skb, struct net_device *dev) | |
863 | { | |
864 | struct sock *sk; | |
5f8f59d6 | 865 | struct sock *make; |
1da177e4 LT |
866 | struct nr_sock *nr_make; |
867 | ax25_address *src, *dest, *user; | |
868 | unsigned short circuit_index, circuit_id; | |
869 | unsigned short peer_circuit_index, peer_circuit_id; | |
870 | unsigned short frametype, flags, window, timeout; | |
871 | int ret; | |
872 | ||
873 | skb->sk = NULL; /* Initially we don't know who it's for */ | |
874 | ||
875 | /* | |
876 | * skb->data points to the netrom frame start | |
877 | */ | |
878 | ||
879 | src = (ax25_address *)(skb->data + 0); | |
880 | dest = (ax25_address *)(skb->data + 7); | |
881 | ||
882 | circuit_index = skb->data[15]; | |
883 | circuit_id = skb->data[16]; | |
884 | peer_circuit_index = skb->data[17]; | |
885 | peer_circuit_id = skb->data[18]; | |
886 | frametype = skb->data[19] & 0x0F; | |
887 | flags = skb->data[19] & 0xF0; | |
888 | ||
1da177e4 LT |
889 | /* |
890 | * Check for an incoming IP over NET/ROM frame. | |
891 | */ | |
98a82feb RB |
892 | if (frametype == NR_PROTOEXT && |
893 | circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) { | |
1da177e4 | 894 | skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); |
badff6d0 | 895 | skb_reset_transport_header(skb); |
1da177e4 LT |
896 | |
897 | return nr_rx_ip(skb, dev); | |
898 | } | |
1da177e4 LT |
899 | |
900 | /* | |
901 | * Find an existing socket connection, based on circuit ID, if it's | |
902 | * a Connect Request base it on their circuit ID. | |
903 | * | |
904 | * Circuit ID 0/0 is not valid but it could still be a "reset" for a | |
905 | * circuit that no longer exists at the other end ... | |
906 | */ | |
907 | ||
908 | sk = NULL; | |
909 | ||
910 | if (circuit_index == 0 && circuit_id == 0) { | |
911 | if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG) | |
912 | sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src); | |
913 | } else { | |
914 | if (frametype == NR_CONNREQ) | |
915 | sk = nr_find_peer(circuit_index, circuit_id, src); | |
916 | else | |
917 | sk = nr_find_socket(circuit_index, circuit_id); | |
918 | } | |
919 | ||
920 | if (sk != NULL) { | |
badff6d0 | 921 | skb_reset_transport_header(skb); |
1da177e4 LT |
922 | |
923 | if (frametype == NR_CONNACK && skb->len == 22) | |
924 | nr_sk(sk)->bpqext = 1; | |
925 | else | |
926 | nr_sk(sk)->bpqext = 0; | |
927 | ||
928 | ret = nr_process_rx_frame(sk, skb); | |
929 | bh_unlock_sock(sk); | |
930 | return ret; | |
931 | } | |
932 | ||
933 | /* | |
934 | * Now it should be a CONNREQ. | |
935 | */ | |
936 | if (frametype != NR_CONNREQ) { | |
937 | /* | |
938 | * Here it would be nice to be able to send a reset but | |
e21ce8c7 RB |
939 | * NET/ROM doesn't have one. We've tried to extend the protocol |
940 | * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that | |
941 | * apparently kills BPQ boxes... :-( | |
942 | * So now we try to follow the established behaviour of | |
943 | * G8PZT's Xrouter which is sending packets with command type 7 | |
944 | * as an extension of the protocol. | |
1da177e4 | 945 | */ |
e21ce8c7 RB |
946 | if (sysctl_netrom_reset_circuit && |
947 | (frametype != NR_RESET || flags != 0)) | |
948 | nr_transmit_reset(skb, 1); | |
949 | ||
1da177e4 LT |
950 | return 0; |
951 | } | |
952 | ||
953 | sk = nr_find_listener(dest); | |
954 | ||
955 | user = (ax25_address *)(skb->data + 21); | |
956 | ||
957 | if (sk == NULL || sk_acceptq_is_full(sk) || | |
958 | (make = nr_make_new(sk)) == NULL) { | |
959 | nr_transmit_refusal(skb, 0); | |
960 | if (sk) | |
961 | bh_unlock_sock(sk); | |
962 | return 0; | |
963 | } | |
964 | ||
965 | window = skb->data[20]; | |
966 | ||
967 | skb->sk = make; | |
968 | make->sk_state = TCP_ESTABLISHED; | |
969 | ||
970 | /* Fill in his circuit details */ | |
971 | nr_make = nr_sk(make); | |
972 | nr_make->source_addr = *dest; | |
973 | nr_make->dest_addr = *src; | |
974 | nr_make->user_addr = *user; | |
975 | ||
976 | nr_make->your_index = circuit_index; | |
977 | nr_make->your_id = circuit_id; | |
978 | ||
979 | bh_unlock_sock(sk); | |
980 | circuit = nr_find_next_circuit(); | |
981 | bh_lock_sock(sk); | |
982 | ||
983 | nr_make->my_index = circuit / 256; | |
984 | nr_make->my_id = circuit % 256; | |
985 | ||
986 | circuit++; | |
987 | ||
988 | /* Window negotiation */ | |
989 | if (window < nr_make->window) | |
990 | nr_make->window = window; | |
991 | ||
992 | /* L4 timeout negotiation */ | |
993 | if (skb->len == 37) { | |
994 | timeout = skb->data[36] * 256 + skb->data[35]; | |
995 | if (timeout * HZ < nr_make->t1) | |
996 | nr_make->t1 = timeout * HZ; | |
997 | nr_make->bpqext = 1; | |
998 | } else { | |
999 | nr_make->bpqext = 0; | |
1000 | } | |
1001 | ||
1002 | nr_write_internal(make, NR_CONNACK); | |
1003 | ||
1004 | nr_make->condition = 0x00; | |
1005 | nr_make->vs = 0; | |
1006 | nr_make->va = 0; | |
1007 | nr_make->vr = 0; | |
1008 | nr_make->vl = 0; | |
1009 | nr_make->state = NR_STATE_3; | |
18601a7d | 1010 | sk_acceptq_added(sk); |
1da177e4 LT |
1011 | skb_queue_head(&sk->sk_receive_queue, skb); |
1012 | ||
1da177e4 | 1013 | if (!sock_flag(sk, SOCK_DEAD)) |
676d2369 | 1014 | sk->sk_data_ready(sk); |
1da177e4 LT |
1015 | |
1016 | bh_unlock_sock(sk); | |
5cc29e3b RB |
1017 | |
1018 | nr_insert_socket(make); | |
1019 | ||
1020 | nr_start_heartbeat(make); | |
1021 | nr_start_idletimer(make); | |
1022 | ||
1da177e4 LT |
1023 | return 1; |
1024 | } | |
1025 | ||
1b784140 | 1026 | static int nr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
1da177e4 LT |
1027 | { |
1028 | struct sock *sk = sock->sk; | |
1029 | struct nr_sock *nr = nr_sk(sk); | |
342dfc30 | 1030 | DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name); |
1da177e4 LT |
1031 | int err; |
1032 | struct sockaddr_ax25 sax; | |
1033 | struct sk_buff *skb; | |
1034 | unsigned char *asmptr; | |
1035 | int size; | |
1036 | ||
1037 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) | |
1038 | return -EINVAL; | |
1039 | ||
1040 | lock_sock(sk); | |
1041 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
1042 | err = -EADDRNOTAVAIL; | |
1043 | goto out; | |
1044 | } | |
1045 | ||
1046 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
1047 | send_sig(SIGPIPE, current, 0); | |
1048 | err = -EPIPE; | |
1049 | goto out; | |
1050 | } | |
1051 | ||
1052 | if (nr->device == NULL) { | |
1053 | err = -ENETUNREACH; | |
1054 | goto out; | |
1055 | } | |
1056 | ||
1057 | if (usax) { | |
1058 | if (msg->msg_namelen < sizeof(sax)) { | |
1059 | err = -EINVAL; | |
1060 | goto out; | |
1061 | } | |
1062 | sax = *usax; | |
1063 | if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) { | |
1064 | err = -EISCONN; | |
1065 | goto out; | |
1066 | } | |
1067 | if (sax.sax25_family != AF_NETROM) { | |
1068 | err = -EINVAL; | |
1069 | goto out; | |
1070 | } | |
1071 | } else { | |
1072 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1073 | err = -ENOTCONN; | |
1074 | goto out; | |
1075 | } | |
1076 | sax.sax25_family = AF_NETROM; | |
1077 | sax.sax25_call = nr->dest_addr; | |
1078 | } | |
1079 | ||
83e0bbcb AC |
1080 | /* Build a packet - the conventional user limit is 236 bytes. We can |
1081 | do ludicrously large NetROM frames but must not overflow */ | |
cc29c70d JD |
1082 | if (len > 65536) { |
1083 | err = -EMSGSIZE; | |
1084 | goto out; | |
1085 | } | |
83e0bbcb | 1086 | |
1da177e4 LT |
1087 | size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN; |
1088 | ||
1089 | if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL) | |
1090 | goto out; | |
1091 | ||
1092 | skb_reserve(skb, size - len); | |
eeeb0374 | 1093 | skb_reset_transport_header(skb); |
1da177e4 LT |
1094 | |
1095 | /* | |
1096 | * Push down the NET/ROM header | |
1097 | */ | |
1098 | ||
1099 | asmptr = skb_push(skb, NR_TRANSPORT_LEN); | |
1da177e4 LT |
1100 | |
1101 | /* Build a NET/ROM Transport header */ | |
1102 | ||
1103 | *asmptr++ = nr->your_index; | |
1104 | *asmptr++ = nr->your_id; | |
1105 | *asmptr++ = 0; /* To be filled in later */ | |
1106 | *asmptr++ = 0; /* Ditto */ | |
1107 | *asmptr++ = NR_INFO; | |
1da177e4 LT |
1108 | |
1109 | /* | |
1110 | * Put the data on the end | |
1111 | */ | |
eeeb0374 | 1112 | skb_put(skb, len); |
1da177e4 | 1113 | |
1da177e4 | 1114 | /* User data follows immediately after the NET/ROM transport header */ |
6ce8e9ce | 1115 | if (memcpy_from_msg(skb_transport_header(skb), msg, len)) { |
1da177e4 LT |
1116 | kfree_skb(skb); |
1117 | err = -EFAULT; | |
1118 | goto out; | |
1119 | } | |
1120 | ||
1da177e4 LT |
1121 | if (sk->sk_state != TCP_ESTABLISHED) { |
1122 | kfree_skb(skb); | |
1123 | err = -ENOTCONN; | |
1124 | goto out; | |
1125 | } | |
1126 | ||
1127 | nr_output(sk, skb); /* Shove it onto the queue */ | |
1128 | ||
1129 | err = len; | |
1130 | out: | |
1131 | release_sock(sk); | |
1132 | return err; | |
1133 | } | |
1134 | ||
1b784140 YX |
1135 | static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1136 | int flags) | |
1da177e4 LT |
1137 | { |
1138 | struct sock *sk = sock->sk; | |
342dfc30 | 1139 | DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name); |
1da177e4 LT |
1140 | size_t copied; |
1141 | struct sk_buff *skb; | |
1142 | int er; | |
1143 | ||
1144 | /* | |
1145 | * This works for seqpacket too. The receiver has ordered the queue for | |
1146 | * us! We do one quick check first though | |
1147 | */ | |
1148 | ||
1149 | lock_sock(sk); | |
1150 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1151 | release_sock(sk); | |
1152 | return -ENOTCONN; | |
1153 | } | |
1154 | ||
1155 | /* Now we can treat all alike */ | |
1156 | if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) { | |
1157 | release_sock(sk); | |
1158 | return er; | |
1159 | } | |
1160 | ||
badff6d0 | 1161 | skb_reset_transport_header(skb); |
1da177e4 LT |
1162 | copied = skb->len; |
1163 | ||
1164 | if (copied > size) { | |
1165 | copied = size; | |
1166 | msg->msg_flags |= MSG_TRUNC; | |
1167 | } | |
1168 | ||
51f3d02b | 1169 | er = skb_copy_datagram_msg(skb, 0, msg, copied); |
6cf5c951 AC |
1170 | if (er < 0) { |
1171 | skb_free_datagram(sk, skb); | |
1172 | release_sock(sk); | |
1173 | return er; | |
1174 | } | |
1da177e4 LT |
1175 | |
1176 | if (sax != NULL) { | |
c802d759 | 1177 | memset(sax, 0, sizeof(*sax)); |
1da177e4 | 1178 | sax->sax25_family = AF_NETROM; |
d626f62b ACM |
1179 | skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call, |
1180 | AX25_ADDR_LEN); | |
f3d33426 | 1181 | msg->msg_namelen = sizeof(*sax); |
1da177e4 LT |
1182 | } |
1183 | ||
80e20f6f | 1184 | skb_free_datagram(sk, skb); |
1da177e4 LT |
1185 | |
1186 | release_sock(sk); | |
1187 | return copied; | |
1188 | } | |
1189 | ||
1190 | ||
1191 | static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1192 | { | |
1193 | struct sock *sk = sock->sk; | |
1194 | void __user *argp = (void __user *)arg; | |
1195 | int ret; | |
1196 | ||
1da177e4 LT |
1197 | switch (cmd) { |
1198 | case TIOCOUTQ: { | |
1199 | long amount; | |
5ff7630e CH |
1200 | |
1201 | lock_sock(sk); | |
31e6d363 | 1202 | amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); |
1da177e4 LT |
1203 | if (amount < 0) |
1204 | amount = 0; | |
1205 | release_sock(sk); | |
1206 | return put_user(amount, (int __user *)argp); | |
1207 | } | |
1208 | ||
1209 | case TIOCINQ: { | |
1210 | struct sk_buff *skb; | |
1211 | long amount = 0L; | |
5ff7630e CH |
1212 | |
1213 | lock_sock(sk); | |
1da177e4 LT |
1214 | /* These two are safe on a single CPU system as only user tasks fiddle here */ |
1215 | if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) | |
1216 | amount = skb->len; | |
1217 | release_sock(sk); | |
1218 | return put_user(amount, (int __user *)argp); | |
1219 | } | |
1220 | ||
1221 | case SIOCGSTAMP: | |
5ff7630e | 1222 | lock_sock(sk); |
9b37ee75 | 1223 | ret = sock_get_timestamp(sk, argp); |
1da177e4 LT |
1224 | release_sock(sk); |
1225 | return ret; | |
1226 | ||
ae40eb1e ED |
1227 | case SIOCGSTAMPNS: |
1228 | lock_sock(sk); | |
1229 | ret = sock_get_timestampns(sk, argp); | |
1230 | release_sock(sk); | |
1231 | return ret; | |
1232 | ||
1da177e4 LT |
1233 | case SIOCGIFADDR: |
1234 | case SIOCSIFADDR: | |
1235 | case SIOCGIFDSTADDR: | |
1236 | case SIOCSIFDSTADDR: | |
1237 | case SIOCGIFBRDADDR: | |
1238 | case SIOCSIFBRDADDR: | |
1239 | case SIOCGIFNETMASK: | |
1240 | case SIOCSIFNETMASK: | |
1241 | case SIOCGIFMETRIC: | |
1242 | case SIOCSIFMETRIC: | |
1da177e4 LT |
1243 | return -EINVAL; |
1244 | ||
1245 | case SIOCADDRT: | |
1246 | case SIOCDELRT: | |
1247 | case SIOCNRDECOBS: | |
0f20f5a7 RB |
1248 | if (!capable(CAP_NET_ADMIN)) |
1249 | return -EPERM; | |
1da177e4 LT |
1250 | return nr_rt_ioctl(cmd, argp); |
1251 | ||
1252 | default: | |
b5e5fa5e | 1253 | return -ENOIOCTLCMD; |
1da177e4 | 1254 | } |
1da177e4 LT |
1255 | |
1256 | return 0; | |
1257 | } | |
1258 | ||
1259 | #ifdef CONFIG_PROC_FS | |
1260 | ||
1261 | static void *nr_info_start(struct seq_file *seq, loff_t *pos) | |
1262 | { | |
1da177e4 | 1263 | spin_lock_bh(&nr_list_lock); |
90dd7f5a | 1264 | return seq_hlist_start_head(&nr_list, *pos); |
1da177e4 LT |
1265 | } |
1266 | ||
1267 | static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos) | |
1268 | { | |
90dd7f5a | 1269 | return seq_hlist_next(v, &nr_list, pos); |
1da177e4 | 1270 | } |
5f8f59d6 | 1271 | |
1da177e4 LT |
1272 | static void nr_info_stop(struct seq_file *seq, void *v) |
1273 | { | |
1274 | spin_unlock_bh(&nr_list_lock); | |
1275 | } | |
1276 | ||
1277 | static int nr_info_show(struct seq_file *seq, void *v) | |
1278 | { | |
90dd7f5a | 1279 | struct sock *s = sk_entry(v); |
1da177e4 LT |
1280 | struct net_device *dev; |
1281 | struct nr_sock *nr; | |
1282 | const char *devname; | |
f75268cd | 1283 | char buf[11]; |
1da177e4 LT |
1284 | |
1285 | if (v == SEQ_START_TOKEN) | |
1286 | seq_puts(seq, | |
1287 | "user_addr dest_node src_node dev my your st vs vr va t1 t2 t4 idle n2 wnd Snd-Q Rcv-Q inode\n"); | |
1288 | ||
1289 | else { | |
1290 | ||
1291 | bh_lock_sock(s); | |
1292 | nr = nr_sk(s); | |
1293 | ||
1294 | if ((dev = nr->device) == NULL) | |
1295 | devname = "???"; | |
1296 | else | |
1297 | devname = dev->name; | |
1298 | ||
f75268cd RB |
1299 | seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr)); |
1300 | seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr)); | |
5f8f59d6 | 1301 | seq_printf(seq, |
1da177e4 | 1302 | "%-9s %-3s %02X/%02X %02X/%02X %2d %3d %3d %3d %3lu/%03lu %2lu/%02lu %3lu/%03lu %3lu/%03lu %2d/%02d %3d %5d %5d %ld\n", |
f75268cd | 1303 | ax2asc(buf, &nr->source_addr), |
1da177e4 LT |
1304 | devname, |
1305 | nr->my_index, | |
1306 | nr->my_id, | |
1307 | nr->your_index, | |
1308 | nr->your_id, | |
1309 | nr->state, | |
1310 | nr->vs, | |
1311 | nr->vr, | |
1312 | nr->va, | |
1313 | ax25_display_timer(&nr->t1timer) / HZ, | |
1314 | nr->t1 / HZ, | |
1315 | ax25_display_timer(&nr->t2timer) / HZ, | |
1316 | nr->t2 / HZ, | |
1317 | ax25_display_timer(&nr->t4timer) / HZ, | |
1318 | nr->t4 / HZ, | |
1319 | ax25_display_timer(&nr->idletimer) / (60 * HZ), | |
1320 | nr->idle / (60 * HZ), | |
1321 | nr->n2count, | |
1322 | nr->n2, | |
1323 | nr->window, | |
31e6d363 ED |
1324 | sk_wmem_alloc_get(s), |
1325 | sk_rmem_alloc_get(s), | |
1da177e4 LT |
1326 | s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); |
1327 | ||
1328 | bh_unlock_sock(s); | |
1329 | } | |
1330 | return 0; | |
1331 | } | |
1332 | ||
56b3d975 | 1333 | static const struct seq_operations nr_info_seqops = { |
1da177e4 LT |
1334 | .start = nr_info_start, |
1335 | .next = nr_info_next, | |
1336 | .stop = nr_info_stop, | |
1337 | .show = nr_info_show, | |
1338 | }; | |
5f8f59d6 | 1339 | |
1da177e4 LT |
1340 | static int nr_info_open(struct inode *inode, struct file *file) |
1341 | { | |
1342 | return seq_open(file, &nr_info_seqops); | |
1343 | } | |
5f8f59d6 | 1344 | |
da7071d7 | 1345 | static const struct file_operations nr_info_fops = { |
1da177e4 LT |
1346 | .owner = THIS_MODULE, |
1347 | .open = nr_info_open, | |
1348 | .read = seq_read, | |
1349 | .llseek = seq_lseek, | |
1350 | .release = seq_release, | |
1351 | }; | |
1352 | #endif /* CONFIG_PROC_FS */ | |
1353 | ||
ec1b4cf7 | 1354 | static const struct net_proto_family nr_family_ops = { |
1da177e4 LT |
1355 | .family = PF_NETROM, |
1356 | .create = nr_create, | |
1357 | .owner = THIS_MODULE, | |
1358 | }; | |
1359 | ||
90ddc4f0 | 1360 | static const struct proto_ops nr_proto_ops = { |
1da177e4 LT |
1361 | .family = PF_NETROM, |
1362 | .owner = THIS_MODULE, | |
1363 | .release = nr_release, | |
1364 | .bind = nr_bind, | |
1365 | .connect = nr_connect, | |
1366 | .socketpair = sock_no_socketpair, | |
1367 | .accept = nr_accept, | |
1368 | .getname = nr_getname, | |
1369 | .poll = datagram_poll, | |
1370 | .ioctl = nr_ioctl, | |
1371 | .listen = nr_listen, | |
1372 | .shutdown = sock_no_shutdown, | |
1373 | .setsockopt = nr_setsockopt, | |
1374 | .getsockopt = nr_getsockopt, | |
1375 | .sendmsg = nr_sendmsg, | |
1376 | .recvmsg = nr_recvmsg, | |
1377 | .mmap = sock_no_mmap, | |
1378 | .sendpage = sock_no_sendpage, | |
1379 | }; | |
1380 | ||
1381 | static struct notifier_block nr_dev_notifier = { | |
1382 | .notifier_call = nr_device_event, | |
1383 | }; | |
1384 | ||
1385 | static struct net_device **dev_nr; | |
1386 | ||
8d5cf596 RB |
1387 | static struct ax25_protocol nr_pid = { |
1388 | .pid = AX25_P_NETROM, | |
1389 | .func = nr_route_frame | |
1390 | }; | |
1391 | ||
a4282717 RB |
1392 | static struct ax25_linkfail nr_linkfail_notifier = { |
1393 | .func = nr_link_failed, | |
1394 | }; | |
1395 | ||
1da177e4 LT |
1396 | static int __init nr_proto_init(void) |
1397 | { | |
1398 | int i; | |
1399 | int rc = proto_register(&nr_proto, 0); | |
1400 | ||
1401 | if (rc != 0) | |
1402 | goto out; | |
1403 | ||
1404 | if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) { | |
1405 | printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n"); | |
1406 | return -1; | |
1407 | } | |
1408 | ||
1b30dd35 | 1409 | dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL); |
1da177e4 LT |
1410 | if (dev_nr == NULL) { |
1411 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n"); | |
1412 | return -1; | |
1413 | } | |
1414 | ||
1da177e4 LT |
1415 | for (i = 0; i < nr_ndevs; i++) { |
1416 | char name[IFNAMSIZ]; | |
1417 | struct net_device *dev; | |
1418 | ||
1419 | sprintf(name, "nr%d", i); | |
c835a677 | 1420 | dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, nr_setup); |
1da177e4 LT |
1421 | if (!dev) { |
1422 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n"); | |
1423 | goto fail; | |
1424 | } | |
5f8f59d6 | 1425 | |
1da177e4 LT |
1426 | dev->base_addr = i; |
1427 | if (register_netdev(dev)) { | |
1428 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n"); | |
1429 | free_netdev(dev); | |
1430 | goto fail; | |
1431 | } | |
c773e847 | 1432 | nr_set_lockdep_key(dev); |
1da177e4 LT |
1433 | dev_nr[i] = dev; |
1434 | } | |
1435 | ||
1436 | if (sock_register(&nr_family_ops)) { | |
1437 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n"); | |
1438 | goto fail; | |
1439 | } | |
5f8f59d6 | 1440 | |
1da177e4 | 1441 | register_netdevice_notifier(&nr_dev_notifier); |
1da177e4 | 1442 | |
8d5cf596 | 1443 | ax25_register_pid(&nr_pid); |
a4282717 | 1444 | ax25_linkfail_register(&nr_linkfail_notifier); |
1da177e4 LT |
1445 | |
1446 | #ifdef CONFIG_SYSCTL | |
1447 | nr_register_sysctl(); | |
1448 | #endif | |
1449 | ||
1450 | nr_loopback_init(); | |
1451 | ||
d4beaa66 G |
1452 | proc_create("nr", S_IRUGO, init_net.proc_net, &nr_info_fops); |
1453 | proc_create("nr_neigh", S_IRUGO, init_net.proc_net, &nr_neigh_fops); | |
1454 | proc_create("nr_nodes", S_IRUGO, init_net.proc_net, &nr_nodes_fops); | |
1da177e4 LT |
1455 | out: |
1456 | return rc; | |
1457 | fail: | |
1458 | while (--i >= 0) { | |
1459 | unregister_netdev(dev_nr[i]); | |
1460 | free_netdev(dev_nr[i]); | |
1461 | } | |
1462 | kfree(dev_nr); | |
1463 | proto_unregister(&nr_proto); | |
1464 | rc = -1; | |
1465 | goto out; | |
1466 | } | |
1467 | ||
1468 | module_init(nr_proto_init); | |
1469 | ||
1470 | module_param(nr_ndevs, int, 0); | |
1471 | MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices"); | |
1472 | ||
1473 | MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); | |
1474 | MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol"); | |
1475 | MODULE_LICENSE("GPL"); | |
1476 | MODULE_ALIAS_NETPROTO(PF_NETROM); | |
1477 | ||
1478 | static void __exit nr_exit(void) | |
1479 | { | |
1480 | int i; | |
1481 | ||
ece31ffd G |
1482 | remove_proc_entry("nr", init_net.proc_net); |
1483 | remove_proc_entry("nr_neigh", init_net.proc_net); | |
1484 | remove_proc_entry("nr_nodes", init_net.proc_net); | |
1da177e4 LT |
1485 | nr_loopback_clear(); |
1486 | ||
1487 | nr_rt_free(); | |
1488 | ||
1489 | #ifdef CONFIG_SYSCTL | |
1490 | nr_unregister_sysctl(); | |
1491 | #endif | |
1492 | ||
a4282717 | 1493 | ax25_linkfail_release(&nr_linkfail_notifier); |
1da177e4 LT |
1494 | ax25_protocol_release(AX25_P_NETROM); |
1495 | ||
1496 | unregister_netdevice_notifier(&nr_dev_notifier); | |
1497 | ||
1498 | sock_unregister(PF_NETROM); | |
1499 | ||
1500 | for (i = 0; i < nr_ndevs; i++) { | |
1501 | struct net_device *dev = dev_nr[i]; | |
1502 | if (dev) { | |
1503 | unregister_netdev(dev); | |
1504 | free_netdev(dev); | |
1505 | } | |
1506 | } | |
1507 | ||
1508 | kfree(dev_nr); | |
1509 | proto_unregister(&nr_proto); | |
1510 | } | |
1511 | module_exit(nr_exit); |