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> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/timer.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/sockios.h> | |
23 | #include <linux/net.h> | |
24 | #include <linux/stat.h> | |
25 | #include <net/ax25.h> | |
26 | #include <linux/inet.h> | |
27 | #include <linux/netdevice.h> | |
28 | #include <linux/if_arp.h> | |
29 | #include <linux/skbuff.h> | |
457c4cbc | 30 | #include <net/net_namespace.h> |
1da177e4 LT |
31 | #include <net/sock.h> |
32 | #include <asm/uaccess.h> | |
33 | #include <asm/system.h> | |
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; | |
76 | ||
c773e847 DM |
77 | static void nr_set_lockdep_one(struct netdev_queue *txq) |
78 | { | |
79 | lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key); | |
80 | } | |
81 | ||
82 | static void nr_set_lockdep_key(struct net_device *dev) | |
83 | { | |
84 | nr_set_lockdep_one(&dev->tx_queue); | |
85 | } | |
86 | ||
1da177e4 LT |
87 | /* |
88 | * Socket removal during an interrupt is now safe. | |
89 | */ | |
90 | static void nr_remove_socket(struct sock *sk) | |
91 | { | |
92 | spin_lock_bh(&nr_list_lock); | |
93 | sk_del_node_init(sk); | |
94 | spin_unlock_bh(&nr_list_lock); | |
95 | } | |
96 | ||
97 | /* | |
98 | * Kill all bound sockets on a dropped device. | |
99 | */ | |
100 | static void nr_kill_by_device(struct net_device *dev) | |
101 | { | |
102 | struct sock *s; | |
103 | struct hlist_node *node; | |
104 | ||
105 | spin_lock_bh(&nr_list_lock); | |
106 | sk_for_each(s, node, &nr_list) | |
107 | if (nr_sk(s)->device == dev) | |
108 | nr_disconnect(s, ENETUNREACH); | |
109 | spin_unlock_bh(&nr_list_lock); | |
110 | } | |
111 | ||
112 | /* | |
113 | * Handle device status changes. | |
114 | */ | |
115 | static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
116 | { | |
117 | struct net_device *dev = (struct net_device *)ptr; | |
118 | ||
c346dca1 | 119 | if (dev_net(dev) != &init_net) |
e9dc8653 EB |
120 | return NOTIFY_DONE; |
121 | ||
1da177e4 LT |
122 | if (event != NETDEV_DOWN) |
123 | return NOTIFY_DONE; | |
124 | ||
125 | nr_kill_by_device(dev); | |
126 | nr_rt_device_down(dev); | |
5f8f59d6 | 127 | |
1da177e4 LT |
128 | return NOTIFY_DONE; |
129 | } | |
130 | ||
131 | /* | |
132 | * Add a socket to the bound sockets list. | |
133 | */ | |
134 | static void nr_insert_socket(struct sock *sk) | |
135 | { | |
136 | spin_lock_bh(&nr_list_lock); | |
137 | sk_add_node(sk, &nr_list); | |
138 | spin_unlock_bh(&nr_list_lock); | |
139 | } | |
140 | ||
141 | /* | |
142 | * Find a socket that wants to accept the Connect Request we just | |
143 | * received. | |
144 | */ | |
145 | static struct sock *nr_find_listener(ax25_address *addr) | |
146 | { | |
147 | struct sock *s; | |
148 | struct hlist_node *node; | |
149 | ||
150 | spin_lock_bh(&nr_list_lock); | |
151 | sk_for_each(s, node, &nr_list) | |
152 | if (!ax25cmp(&nr_sk(s)->source_addr, addr) && | |
153 | s->sk_state == TCP_LISTEN) { | |
5f8f59d6 | 154 | bh_lock_sock(s); |
1da177e4 LT |
155 | goto found; |
156 | } | |
157 | s = NULL; | |
158 | found: | |
159 | spin_unlock_bh(&nr_list_lock); | |
160 | return s; | |
161 | } | |
162 | ||
163 | /* | |
164 | * Find a connected NET/ROM socket given my circuit IDs. | |
165 | */ | |
166 | static struct sock *nr_find_socket(unsigned char index, unsigned char id) | |
167 | { | |
168 | struct sock *s; | |
169 | struct hlist_node *node; | |
170 | ||
171 | spin_lock_bh(&nr_list_lock); | |
172 | sk_for_each(s, node, &nr_list) { | |
173 | struct nr_sock *nr = nr_sk(s); | |
5f8f59d6 | 174 | |
1da177e4 LT |
175 | if (nr->my_index == index && nr->my_id == id) { |
176 | bh_lock_sock(s); | |
177 | goto found; | |
178 | } | |
179 | } | |
180 | s = NULL; | |
181 | found: | |
182 | spin_unlock_bh(&nr_list_lock); | |
183 | return s; | |
184 | } | |
185 | ||
186 | /* | |
187 | * Find a connected NET/ROM socket given their circuit IDs. | |
188 | */ | |
189 | static struct sock *nr_find_peer(unsigned char index, unsigned char id, | |
190 | ax25_address *dest) | |
191 | { | |
192 | struct sock *s; | |
193 | struct hlist_node *node; | |
194 | ||
195 | spin_lock_bh(&nr_list_lock); | |
196 | sk_for_each(s, node, &nr_list) { | |
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 | ||
285 | if (atomic_read(&sk->sk_wmem_alloc) || | |
286 | atomic_read(&sk->sk_rmem_alloc)) { | |
287 | /* Defer: outstanding buffers */ | |
288 | sk->sk_timer.function = nr_destroy_timer; | |
289 | sk->sk_timer.expires = jiffies + 2 * HZ; | |
290 | add_timer(&sk->sk_timer); | |
291 | } else | |
292 | sock_put(sk); | |
293 | } | |
294 | ||
295 | /* | |
296 | * Handling for system calls applied via the various interfaces to a | |
297 | * NET/ROM socket object. | |
298 | */ | |
299 | ||
300 | static int nr_setsockopt(struct socket *sock, int level, int optname, | |
301 | char __user *optval, int optlen) | |
302 | { | |
303 | struct sock *sk = sock->sk; | |
304 | struct nr_sock *nr = nr_sk(sk); | |
305 | int opt; | |
306 | ||
307 | if (level != SOL_NETROM) | |
308 | return -ENOPROTOOPT; | |
309 | ||
310 | if (optlen < sizeof(int)) | |
311 | return -EINVAL; | |
312 | ||
313 | if (get_user(opt, (int __user *)optval)) | |
314 | return -EFAULT; | |
315 | ||
316 | switch (optname) { | |
317 | case NETROM_T1: | |
318 | if (opt < 1) | |
319 | return -EINVAL; | |
320 | nr->t1 = opt * HZ; | |
321 | return 0; | |
322 | ||
323 | case NETROM_T2: | |
324 | if (opt < 1) | |
325 | return -EINVAL; | |
326 | nr->t2 = opt * HZ; | |
327 | return 0; | |
328 | ||
329 | case NETROM_N2: | |
330 | if (opt < 1 || opt > 31) | |
331 | return -EINVAL; | |
332 | nr->n2 = opt; | |
333 | return 0; | |
334 | ||
335 | case NETROM_T4: | |
336 | if (opt < 1) | |
337 | return -EINVAL; | |
338 | nr->t4 = opt * HZ; | |
339 | return 0; | |
340 | ||
341 | case NETROM_IDLE: | |
342 | if (opt < 0) | |
343 | return -EINVAL; | |
344 | nr->idle = opt * 60 * HZ; | |
345 | return 0; | |
346 | ||
347 | default: | |
348 | return -ENOPROTOOPT; | |
349 | } | |
350 | } | |
351 | ||
352 | static int nr_getsockopt(struct socket *sock, int level, int optname, | |
353 | char __user *optval, int __user *optlen) | |
354 | { | |
355 | struct sock *sk = sock->sk; | |
356 | struct nr_sock *nr = nr_sk(sk); | |
357 | int val = 0; | |
5f8f59d6 | 358 | int len; |
1da177e4 LT |
359 | |
360 | if (level != SOL_NETROM) | |
361 | return -ENOPROTOOPT; | |
5f8f59d6 | 362 | |
1da177e4 LT |
363 | if (get_user(len, optlen)) |
364 | return -EFAULT; | |
365 | ||
366 | if (len < 0) | |
367 | return -EINVAL; | |
5f8f59d6 | 368 | |
1da177e4 LT |
369 | switch (optname) { |
370 | case NETROM_T1: | |
371 | val = nr->t1 / HZ; | |
372 | break; | |
373 | ||
374 | case NETROM_T2: | |
375 | val = nr->t2 / HZ; | |
376 | break; | |
377 | ||
378 | case NETROM_N2: | |
379 | val = nr->n2; | |
380 | break; | |
381 | ||
382 | case NETROM_T4: | |
383 | val = nr->t4 / HZ; | |
384 | break; | |
385 | ||
386 | case NETROM_IDLE: | |
387 | val = nr->idle / (60 * HZ); | |
388 | break; | |
389 | ||
390 | default: | |
391 | return -ENOPROTOOPT; | |
392 | } | |
393 | ||
394 | len = min_t(unsigned int, len, sizeof(int)); | |
395 | ||
396 | if (put_user(len, optlen)) | |
397 | return -EFAULT; | |
398 | ||
399 | return copy_to_user(optval, &val, len) ? -EFAULT : 0; | |
400 | } | |
401 | ||
402 | static int nr_listen(struct socket *sock, int backlog) | |
403 | { | |
404 | struct sock *sk = sock->sk; | |
405 | ||
406 | lock_sock(sk); | |
407 | if (sk->sk_state != TCP_LISTEN) { | |
408 | memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN); | |
409 | sk->sk_max_ack_backlog = backlog; | |
410 | sk->sk_state = TCP_LISTEN; | |
411 | release_sock(sk); | |
412 | return 0; | |
413 | } | |
414 | release_sock(sk); | |
415 | ||
416 | return -EOPNOTSUPP; | |
417 | } | |
418 | ||
419 | static struct proto nr_proto = { | |
420 | .name = "NETROM", | |
421 | .owner = THIS_MODULE, | |
422 | .obj_size = sizeof(struct nr_sock), | |
423 | }; | |
424 | ||
1b8d7ae4 | 425 | static int nr_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
426 | { |
427 | struct sock *sk; | |
428 | struct nr_sock *nr; | |
429 | ||
1b8d7ae4 EB |
430 | if (net != &init_net) |
431 | return -EAFNOSUPPORT; | |
432 | ||
1da177e4 LT |
433 | if (sock->type != SOCK_SEQPACKET || protocol != 0) |
434 | return -ESOCKTNOSUPPORT; | |
435 | ||
6257ff21 PE |
436 | sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto); |
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 | ||
3b1e0a65 | 479 | sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot); |
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); | |
524 | lock_sock(sk); | |
525 | nr = nr_sk(sk); | |
526 | ||
527 | switch (nr->state) { | |
528 | case NR_STATE_0: | |
529 | case NR_STATE_1: | |
530 | case NR_STATE_2: | |
531 | nr_disconnect(sk, 0); | |
532 | nr_destroy_socket(sk); | |
533 | break; | |
534 | ||
535 | case NR_STATE_3: | |
536 | nr_clear_queues(sk); | |
537 | nr->n2count = 0; | |
538 | nr_write_internal(sk, NR_DISCREQ); | |
539 | nr_start_t1timer(sk); | |
540 | nr_stop_t2timer(sk); | |
541 | nr_stop_t4timer(sk); | |
542 | nr_stop_idletimer(sk); | |
543 | nr->state = NR_STATE_2; | |
544 | sk->sk_state = TCP_CLOSE; | |
545 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
546 | sk->sk_state_change(sk); | |
547 | sock_orphan(sk); | |
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) { | |
589 | SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n"); | |
590 | release_sock(sk); | |
591 | return -EADDRNOTAVAIL; | |
592 | } | |
593 | ||
594 | /* | |
595 | * Only the super user can set an arbitrary user callsign. | |
596 | */ | |
597 | if (addr->fsa_ax25.sax25_ndigis == 1) { | |
598 | if (!capable(CAP_NET_BIND_SERVICE)) { | |
599 | dev_put(dev); | |
600 | release_sock(sk); | |
601 | return -EACCES; | |
602 | } | |
603 | nr->user_addr = addr->fsa_digipeater[0]; | |
604 | nr->source_addr = addr->fsa_ax25.sax25_call; | |
605 | } else { | |
606 | source = &addr->fsa_ax25.sax25_call; | |
607 | ||
01d7dd0e RB |
608 | user = ax25_findbyuid(current->euid); |
609 | if (user) { | |
610 | nr->user_addr = user->call; | |
611 | ax25_uid_put(user); | |
612 | } else { | |
1da177e4 LT |
613 | if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { |
614 | release_sock(sk); | |
615 | dev_put(dev); | |
616 | return -EPERM; | |
617 | } | |
01d7dd0e | 618 | nr->user_addr = *source; |
1da177e4 LT |
619 | } |
620 | ||
1da177e4 LT |
621 | nr->source_addr = *source; |
622 | } | |
623 | ||
624 | nr->device = dev; | |
625 | nr_insert_socket(sk); | |
626 | ||
627 | sock_reset_flag(sk, SOCK_ZAPPED); | |
628 | dev_put(dev); | |
629 | release_sock(sk); | |
630 | SOCK_DEBUG(sk, "NET/ROM: socket is bound\n"); | |
631 | return 0; | |
632 | } | |
633 | ||
634 | static int nr_connect(struct socket *sock, struct sockaddr *uaddr, | |
635 | int addr_len, int flags) | |
636 | { | |
637 | struct sock *sk = sock->sk; | |
638 | struct nr_sock *nr = nr_sk(sk); | |
639 | struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr; | |
01d7dd0e RB |
640 | ax25_address *source = NULL; |
641 | ax25_uid_assoc *user; | |
1da177e4 | 642 | struct net_device *dev; |
75606dc6 | 643 | int err = 0; |
1da177e4 LT |
644 | |
645 | lock_sock(sk); | |
646 | if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { | |
647 | sock->state = SS_CONNECTED; | |
75606dc6 | 648 | goto out_release; /* Connect completed during a ERESTARTSYS event */ |
1da177e4 LT |
649 | } |
650 | ||
651 | if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { | |
652 | sock->state = SS_UNCONNECTED; | |
75606dc6 RB |
653 | err = -ECONNREFUSED; |
654 | goto out_release; | |
1da177e4 LT |
655 | } |
656 | ||
657 | if (sk->sk_state == TCP_ESTABLISHED) { | |
75606dc6 RB |
658 | err = -EISCONN; /* No reconnect on a seqpacket socket */ |
659 | goto out_release; | |
1da177e4 LT |
660 | } |
661 | ||
5f8f59d6 | 662 | sk->sk_state = TCP_CLOSE; |
1da177e4 LT |
663 | sock->state = SS_UNCONNECTED; |
664 | ||
665 | if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) { | |
75606dc6 RB |
666 | err = -EINVAL; |
667 | goto out_release; | |
1da177e4 LT |
668 | } |
669 | if (addr->sax25_family != AF_NETROM) { | |
75606dc6 RB |
670 | err = -EINVAL; |
671 | goto out_release; | |
1da177e4 LT |
672 | } |
673 | if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */ | |
674 | sock_reset_flag(sk, SOCK_ZAPPED); | |
675 | ||
676 | if ((dev = nr_dev_first()) == NULL) { | |
75606dc6 RB |
677 | err = -ENETUNREACH; |
678 | goto out_release; | |
1da177e4 LT |
679 | } |
680 | source = (ax25_address *)dev->dev_addr; | |
681 | ||
01d7dd0e RB |
682 | user = ax25_findbyuid(current->euid); |
683 | if (user) { | |
684 | nr->user_addr = user->call; | |
685 | ax25_uid_put(user); | |
686 | } else { | |
1da177e4 LT |
687 | if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) { |
688 | dev_put(dev); | |
75606dc6 RB |
689 | err = -EPERM; |
690 | goto out_release; | |
1da177e4 | 691 | } |
01d7dd0e | 692 | nr->user_addr = *source; |
1da177e4 LT |
693 | } |
694 | ||
1da177e4 LT |
695 | nr->source_addr = *source; |
696 | nr->device = dev; | |
697 | ||
698 | dev_put(dev); | |
699 | nr_insert_socket(sk); /* Finish the bind */ | |
700 | } | |
701 | ||
702 | nr->dest_addr = addr->sax25_call; | |
703 | ||
704 | release_sock(sk); | |
705 | circuit = nr_find_next_circuit(); | |
706 | lock_sock(sk); | |
707 | ||
708 | nr->my_index = circuit / 256; | |
709 | nr->my_id = circuit % 256; | |
710 | ||
711 | circuit++; | |
712 | ||
713 | /* Move to connecting socket, start sending Connect Requests */ | |
714 | sock->state = SS_CONNECTING; | |
715 | sk->sk_state = TCP_SYN_SENT; | |
716 | ||
717 | nr_establish_data_link(sk); | |
718 | ||
719 | nr->state = NR_STATE_1; | |
720 | ||
721 | nr_start_heartbeat(sk); | |
722 | ||
723 | /* Now the loop */ | |
724 | if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { | |
75606dc6 RB |
725 | err = -EINPROGRESS; |
726 | goto out_release; | |
1da177e4 | 727 | } |
5f8f59d6 | 728 | |
1da177e4 LT |
729 | /* |
730 | * A Connect Ack with Choke or timeout or failed routing will go to | |
731 | * closed. | |
732 | */ | |
733 | if (sk->sk_state == TCP_SYN_SENT) { | |
75606dc6 | 734 | DEFINE_WAIT(wait); |
1da177e4 | 735 | |
1da177e4 | 736 | for (;;) { |
75606dc6 | 737 | prepare_to_wait(sk->sk_sleep, &wait, |
639fc4c3 | 738 | TASK_INTERRUPTIBLE); |
1da177e4 LT |
739 | if (sk->sk_state != TCP_SYN_SENT) |
740 | break; | |
75606dc6 RB |
741 | if (!signal_pending(current)) { |
742 | release_sock(sk); | |
1da177e4 LT |
743 | schedule(); |
744 | lock_sock(sk); | |
745 | continue; | |
746 | } | |
75606dc6 RB |
747 | err = -ERESTARTSYS; |
748 | break; | |
1da177e4 | 749 | } |
75606dc6 RB |
750 | finish_wait(sk->sk_sleep, &wait); |
751 | if (err) | |
752 | goto out_release; | |
1da177e4 LT |
753 | } |
754 | ||
755 | if (sk->sk_state != TCP_ESTABLISHED) { | |
756 | sock->state = SS_UNCONNECTED; | |
75606dc6 RB |
757 | err = sock_error(sk); /* Always set at this point */ |
758 | goto out_release; | |
1da177e4 LT |
759 | } |
760 | ||
761 | sock->state = SS_CONNECTED; | |
75606dc6 RB |
762 | |
763 | out_release: | |
1da177e4 LT |
764 | release_sock(sk); |
765 | ||
75606dc6 | 766 | return err; |
1da177e4 LT |
767 | } |
768 | ||
769 | static int nr_accept(struct socket *sock, struct socket *newsock, int flags) | |
770 | { | |
1da177e4 LT |
771 | struct sk_buff *skb; |
772 | struct sock *newsk; | |
75606dc6 | 773 | DEFINE_WAIT(wait); |
1da177e4 LT |
774 | struct sock *sk; |
775 | int err = 0; | |
776 | ||
777 | if ((sk = sock->sk) == NULL) | |
778 | return -EINVAL; | |
779 | ||
780 | lock_sock(sk); | |
781 | if (sk->sk_type != SOCK_SEQPACKET) { | |
782 | err = -EOPNOTSUPP; | |
75606dc6 | 783 | goto out_release; |
1da177e4 LT |
784 | } |
785 | ||
786 | if (sk->sk_state != TCP_LISTEN) { | |
787 | err = -EINVAL; | |
75606dc6 | 788 | goto out_release; |
1da177e4 LT |
789 | } |
790 | ||
791 | /* | |
792 | * The write queue this time is holding sockets ready to use | |
793 | * hooked into the SABM we saved | |
794 | */ | |
1da177e4 | 795 | for (;;) { |
75606dc6 | 796 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
797 | skb = skb_dequeue(&sk->sk_receive_queue); |
798 | if (skb) | |
799 | break; | |
800 | ||
1da177e4 | 801 | if (flags & O_NONBLOCK) { |
75606dc6 RB |
802 | err = -EWOULDBLOCK; |
803 | break; | |
1da177e4 | 804 | } |
75606dc6 RB |
805 | if (!signal_pending(current)) { |
806 | release_sock(sk); | |
1da177e4 LT |
807 | schedule(); |
808 | lock_sock(sk); | |
809 | continue; | |
810 | } | |
75606dc6 RB |
811 | err = -ERESTARTSYS; |
812 | break; | |
1da177e4 | 813 | } |
75606dc6 RB |
814 | finish_wait(sk->sk_sleep, &wait); |
815 | if (err) | |
816 | goto out_release; | |
1da177e4 LT |
817 | |
818 | newsk = skb->sk; | |
7b66767f | 819 | sock_graft(newsk, newsock); |
1da177e4 LT |
820 | |
821 | /* Now attach up the new socket */ | |
822 | kfree_skb(skb); | |
18601a7d | 823 | sk_acceptq_removed(sk); |
1da177e4 | 824 | |
75606dc6 | 825 | out_release: |
1da177e4 | 826 | release_sock(sk); |
75606dc6 | 827 | |
1da177e4 LT |
828 | return err; |
829 | } | |
830 | ||
831 | static int nr_getname(struct socket *sock, struct sockaddr *uaddr, | |
832 | int *uaddr_len, int peer) | |
833 | { | |
834 | struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr; | |
835 | struct sock *sk = sock->sk; | |
836 | struct nr_sock *nr = nr_sk(sk); | |
837 | ||
838 | lock_sock(sk); | |
839 | if (peer != 0) { | |
840 | if (sk->sk_state != TCP_ESTABLISHED) { | |
841 | release_sock(sk); | |
842 | return -ENOTCONN; | |
843 | } | |
844 | sax->fsa_ax25.sax25_family = AF_NETROM; | |
845 | sax->fsa_ax25.sax25_ndigis = 1; | |
846 | sax->fsa_ax25.sax25_call = nr->user_addr; | |
847 | sax->fsa_digipeater[0] = nr->dest_addr; | |
848 | *uaddr_len = sizeof(struct full_sockaddr_ax25); | |
849 | } else { | |
850 | sax->fsa_ax25.sax25_family = AF_NETROM; | |
851 | sax->fsa_ax25.sax25_ndigis = 0; | |
852 | sax->fsa_ax25.sax25_call = nr->source_addr; | |
853 | *uaddr_len = sizeof(struct sockaddr_ax25); | |
854 | } | |
855 | release_sock(sk); | |
856 | ||
857 | return 0; | |
858 | } | |
859 | ||
860 | int nr_rx_frame(struct sk_buff *skb, struct net_device *dev) | |
861 | { | |
862 | struct sock *sk; | |
5f8f59d6 | 863 | struct sock *make; |
1da177e4 LT |
864 | struct nr_sock *nr_make; |
865 | ax25_address *src, *dest, *user; | |
866 | unsigned short circuit_index, circuit_id; | |
867 | unsigned short peer_circuit_index, peer_circuit_id; | |
868 | unsigned short frametype, flags, window, timeout; | |
869 | int ret; | |
870 | ||
871 | skb->sk = NULL; /* Initially we don't know who it's for */ | |
872 | ||
873 | /* | |
874 | * skb->data points to the netrom frame start | |
875 | */ | |
876 | ||
877 | src = (ax25_address *)(skb->data + 0); | |
878 | dest = (ax25_address *)(skb->data + 7); | |
879 | ||
880 | circuit_index = skb->data[15]; | |
881 | circuit_id = skb->data[16]; | |
882 | peer_circuit_index = skb->data[17]; | |
883 | peer_circuit_id = skb->data[18]; | |
884 | frametype = skb->data[19] & 0x0F; | |
885 | flags = skb->data[19] & 0xF0; | |
886 | ||
1da177e4 LT |
887 | /* |
888 | * Check for an incoming IP over NET/ROM frame. | |
889 | */ | |
98a82feb RB |
890 | if (frametype == NR_PROTOEXT && |
891 | circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) { | |
1da177e4 | 892 | skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); |
badff6d0 | 893 | skb_reset_transport_header(skb); |
1da177e4 LT |
894 | |
895 | return nr_rx_ip(skb, dev); | |
896 | } | |
1da177e4 LT |
897 | |
898 | /* | |
899 | * Find an existing socket connection, based on circuit ID, if it's | |
900 | * a Connect Request base it on their circuit ID. | |
901 | * | |
902 | * Circuit ID 0/0 is not valid but it could still be a "reset" for a | |
903 | * circuit that no longer exists at the other end ... | |
904 | */ | |
905 | ||
906 | sk = NULL; | |
907 | ||
908 | if (circuit_index == 0 && circuit_id == 0) { | |
909 | if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG) | |
910 | sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src); | |
911 | } else { | |
912 | if (frametype == NR_CONNREQ) | |
913 | sk = nr_find_peer(circuit_index, circuit_id, src); | |
914 | else | |
915 | sk = nr_find_socket(circuit_index, circuit_id); | |
916 | } | |
917 | ||
918 | if (sk != NULL) { | |
badff6d0 | 919 | skb_reset_transport_header(skb); |
1da177e4 LT |
920 | |
921 | if (frametype == NR_CONNACK && skb->len == 22) | |
922 | nr_sk(sk)->bpqext = 1; | |
923 | else | |
924 | nr_sk(sk)->bpqext = 0; | |
925 | ||
926 | ret = nr_process_rx_frame(sk, skb); | |
927 | bh_unlock_sock(sk); | |
928 | return ret; | |
929 | } | |
930 | ||
931 | /* | |
932 | * Now it should be a CONNREQ. | |
933 | */ | |
934 | if (frametype != NR_CONNREQ) { | |
935 | /* | |
936 | * Here it would be nice to be able to send a reset but | |
e21ce8c7 RB |
937 | * NET/ROM doesn't have one. We've tried to extend the protocol |
938 | * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that | |
939 | * apparently kills BPQ boxes... :-( | |
940 | * So now we try to follow the established behaviour of | |
941 | * G8PZT's Xrouter which is sending packets with command type 7 | |
942 | * as an extension of the protocol. | |
1da177e4 | 943 | */ |
e21ce8c7 RB |
944 | if (sysctl_netrom_reset_circuit && |
945 | (frametype != NR_RESET || flags != 0)) | |
946 | nr_transmit_reset(skb, 1); | |
947 | ||
1da177e4 LT |
948 | return 0; |
949 | } | |
950 | ||
951 | sk = nr_find_listener(dest); | |
952 | ||
953 | user = (ax25_address *)(skb->data + 21); | |
954 | ||
955 | if (sk == NULL || sk_acceptq_is_full(sk) || | |
956 | (make = nr_make_new(sk)) == NULL) { | |
957 | nr_transmit_refusal(skb, 0); | |
958 | if (sk) | |
959 | bh_unlock_sock(sk); | |
960 | return 0; | |
961 | } | |
962 | ||
963 | window = skb->data[20]; | |
964 | ||
965 | skb->sk = make; | |
966 | make->sk_state = TCP_ESTABLISHED; | |
967 | ||
968 | /* Fill in his circuit details */ | |
969 | nr_make = nr_sk(make); | |
970 | nr_make->source_addr = *dest; | |
971 | nr_make->dest_addr = *src; | |
972 | nr_make->user_addr = *user; | |
973 | ||
974 | nr_make->your_index = circuit_index; | |
975 | nr_make->your_id = circuit_id; | |
976 | ||
977 | bh_unlock_sock(sk); | |
978 | circuit = nr_find_next_circuit(); | |
979 | bh_lock_sock(sk); | |
980 | ||
981 | nr_make->my_index = circuit / 256; | |
982 | nr_make->my_id = circuit % 256; | |
983 | ||
984 | circuit++; | |
985 | ||
986 | /* Window negotiation */ | |
987 | if (window < nr_make->window) | |
988 | nr_make->window = window; | |
989 | ||
990 | /* L4 timeout negotiation */ | |
991 | if (skb->len == 37) { | |
992 | timeout = skb->data[36] * 256 + skb->data[35]; | |
993 | if (timeout * HZ < nr_make->t1) | |
994 | nr_make->t1 = timeout * HZ; | |
995 | nr_make->bpqext = 1; | |
996 | } else { | |
997 | nr_make->bpqext = 0; | |
998 | } | |
999 | ||
1000 | nr_write_internal(make, NR_CONNACK); | |
1001 | ||
1002 | nr_make->condition = 0x00; | |
1003 | nr_make->vs = 0; | |
1004 | nr_make->va = 0; | |
1005 | nr_make->vr = 0; | |
1006 | nr_make->vl = 0; | |
1007 | nr_make->state = NR_STATE_3; | |
18601a7d | 1008 | sk_acceptq_added(sk); |
1da177e4 LT |
1009 | skb_queue_head(&sk->sk_receive_queue, skb); |
1010 | ||
1da177e4 LT |
1011 | if (!sock_flag(sk, SOCK_DEAD)) |
1012 | sk->sk_data_ready(sk, skb->len); | |
1013 | ||
1014 | bh_unlock_sock(sk); | |
5cc29e3b RB |
1015 | |
1016 | nr_insert_socket(make); | |
1017 | ||
1018 | nr_start_heartbeat(make); | |
1019 | nr_start_idletimer(make); | |
1020 | ||
1da177e4 LT |
1021 | return 1; |
1022 | } | |
1023 | ||
1024 | static int nr_sendmsg(struct kiocb *iocb, struct socket *sock, | |
1025 | struct msghdr *msg, size_t len) | |
1026 | { | |
1027 | struct sock *sk = sock->sk; | |
1028 | struct nr_sock *nr = nr_sk(sk); | |
1029 | struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name; | |
1030 | int err; | |
1031 | struct sockaddr_ax25 sax; | |
1032 | struct sk_buff *skb; | |
1033 | unsigned char *asmptr; | |
1034 | int size; | |
1035 | ||
1036 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) | |
1037 | return -EINVAL; | |
1038 | ||
1039 | lock_sock(sk); | |
1040 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
1041 | err = -EADDRNOTAVAIL; | |
1042 | goto out; | |
1043 | } | |
1044 | ||
1045 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
1046 | send_sig(SIGPIPE, current, 0); | |
1047 | err = -EPIPE; | |
1048 | goto out; | |
1049 | } | |
1050 | ||
1051 | if (nr->device == NULL) { | |
1052 | err = -ENETUNREACH; | |
1053 | goto out; | |
1054 | } | |
1055 | ||
1056 | if (usax) { | |
1057 | if (msg->msg_namelen < sizeof(sax)) { | |
1058 | err = -EINVAL; | |
1059 | goto out; | |
1060 | } | |
1061 | sax = *usax; | |
1062 | if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) { | |
1063 | err = -EISCONN; | |
1064 | goto out; | |
1065 | } | |
1066 | if (sax.sax25_family != AF_NETROM) { | |
1067 | err = -EINVAL; | |
1068 | goto out; | |
1069 | } | |
1070 | } else { | |
1071 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1072 | err = -ENOTCONN; | |
1073 | goto out; | |
1074 | } | |
1075 | sax.sax25_family = AF_NETROM; | |
1076 | sax.sax25_call = nr->dest_addr; | |
1077 | } | |
1078 | ||
1079 | SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n"); | |
1080 | ||
1081 | /* Build a packet */ | |
1082 | SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n"); | |
1083 | size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN; | |
1084 | ||
1085 | if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL) | |
1086 | goto out; | |
1087 | ||
1088 | skb_reserve(skb, size - len); | |
eeeb0374 | 1089 | skb_reset_transport_header(skb); |
1da177e4 LT |
1090 | |
1091 | /* | |
1092 | * Push down the NET/ROM header | |
1093 | */ | |
1094 | ||
1095 | asmptr = skb_push(skb, NR_TRANSPORT_LEN); | |
1096 | SOCK_DEBUG(sk, "Building NET/ROM Header.\n"); | |
1097 | ||
1098 | /* Build a NET/ROM Transport header */ | |
1099 | ||
1100 | *asmptr++ = nr->your_index; | |
1101 | *asmptr++ = nr->your_id; | |
1102 | *asmptr++ = 0; /* To be filled in later */ | |
1103 | *asmptr++ = 0; /* Ditto */ | |
1104 | *asmptr++ = NR_INFO; | |
1105 | SOCK_DEBUG(sk, "Built header.\n"); | |
1106 | ||
1107 | /* | |
1108 | * Put the data on the end | |
1109 | */ | |
eeeb0374 | 1110 | skb_put(skb, len); |
1da177e4 | 1111 | |
1da177e4 LT |
1112 | SOCK_DEBUG(sk, "NET/ROM: Appending user data\n"); |
1113 | ||
1114 | /* User data follows immediately after the NET/ROM transport header */ | |
eeeb0374 | 1115 | if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) { |
1da177e4 LT |
1116 | kfree_skb(skb); |
1117 | err = -EFAULT; | |
1118 | goto out; | |
1119 | } | |
1120 | ||
1121 | SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n"); | |
1122 | ||
1123 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1124 | kfree_skb(skb); | |
1125 | err = -ENOTCONN; | |
1126 | goto out; | |
1127 | } | |
1128 | ||
1129 | nr_output(sk, skb); /* Shove it onto the queue */ | |
1130 | ||
1131 | err = len; | |
1132 | out: | |
1133 | release_sock(sk); | |
1134 | return err; | |
1135 | } | |
1136 | ||
1137 | static int nr_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1138 | struct msghdr *msg, size_t size, int flags) | |
1139 | { | |
1140 | struct sock *sk = sock->sk; | |
1141 | struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name; | |
1142 | size_t copied; | |
1143 | struct sk_buff *skb; | |
1144 | int er; | |
1145 | ||
1146 | /* | |
1147 | * This works for seqpacket too. The receiver has ordered the queue for | |
1148 | * us! We do one quick check first though | |
1149 | */ | |
1150 | ||
1151 | lock_sock(sk); | |
1152 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1153 | release_sock(sk); | |
1154 | return -ENOTCONN; | |
1155 | } | |
1156 | ||
1157 | /* Now we can treat all alike */ | |
1158 | if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) { | |
1159 | release_sock(sk); | |
1160 | return er; | |
1161 | } | |
1162 | ||
badff6d0 | 1163 | skb_reset_transport_header(skb); |
1da177e4 LT |
1164 | copied = skb->len; |
1165 | ||
1166 | if (copied > size) { | |
1167 | copied = size; | |
1168 | msg->msg_flags |= MSG_TRUNC; | |
1169 | } | |
1170 | ||
1171 | skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1172 | ||
1173 | if (sax != NULL) { | |
1174 | sax->sax25_family = AF_NETROM; | |
d626f62b ACM |
1175 | skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call, |
1176 | AX25_ADDR_LEN); | |
1da177e4 LT |
1177 | } |
1178 | ||
1179 | msg->msg_namelen = sizeof(*sax); | |
1180 | ||
1181 | skb_free_datagram(sk, skb); | |
1182 | ||
1183 | release_sock(sk); | |
1184 | return copied; | |
1185 | } | |
1186 | ||
1187 | ||
1188 | static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1189 | { | |
1190 | struct sock *sk = sock->sk; | |
1191 | void __user *argp = (void __user *)arg; | |
1192 | int ret; | |
1193 | ||
1da177e4 LT |
1194 | switch (cmd) { |
1195 | case TIOCOUTQ: { | |
1196 | long amount; | |
5ff7630e CH |
1197 | |
1198 | lock_sock(sk); | |
1da177e4 LT |
1199 | amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); |
1200 | if (amount < 0) | |
1201 | amount = 0; | |
1202 | release_sock(sk); | |
1203 | return put_user(amount, (int __user *)argp); | |
1204 | } | |
1205 | ||
1206 | case TIOCINQ: { | |
1207 | struct sk_buff *skb; | |
1208 | long amount = 0L; | |
5ff7630e CH |
1209 | |
1210 | lock_sock(sk); | |
1da177e4 LT |
1211 | /* These two are safe on a single CPU system as only user tasks fiddle here */ |
1212 | if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) | |
1213 | amount = skb->len; | |
1214 | release_sock(sk); | |
1215 | return put_user(amount, (int __user *)argp); | |
1216 | } | |
1217 | ||
1218 | case SIOCGSTAMP: | |
5ff7630e | 1219 | lock_sock(sk); |
9b37ee75 | 1220 | ret = sock_get_timestamp(sk, argp); |
1da177e4 LT |
1221 | release_sock(sk); |
1222 | return ret; | |
1223 | ||
ae40eb1e ED |
1224 | case SIOCGSTAMPNS: |
1225 | lock_sock(sk); | |
1226 | ret = sock_get_timestampns(sk, argp); | |
1227 | release_sock(sk); | |
1228 | return ret; | |
1229 | ||
1da177e4 LT |
1230 | case SIOCGIFADDR: |
1231 | case SIOCSIFADDR: | |
1232 | case SIOCGIFDSTADDR: | |
1233 | case SIOCSIFDSTADDR: | |
1234 | case SIOCGIFBRDADDR: | |
1235 | case SIOCSIFBRDADDR: | |
1236 | case SIOCGIFNETMASK: | |
1237 | case SIOCSIFNETMASK: | |
1238 | case SIOCGIFMETRIC: | |
1239 | case SIOCSIFMETRIC: | |
1da177e4 LT |
1240 | return -EINVAL; |
1241 | ||
1242 | case SIOCADDRT: | |
1243 | case SIOCDELRT: | |
1244 | case SIOCNRDECOBS: | |
1da177e4 LT |
1245 | if (!capable(CAP_NET_ADMIN)) return -EPERM; |
1246 | return nr_rt_ioctl(cmd, argp); | |
1247 | ||
1248 | default: | |
b5e5fa5e | 1249 | return -ENOIOCTLCMD; |
1da177e4 | 1250 | } |
1da177e4 LT |
1251 | |
1252 | return 0; | |
1253 | } | |
1254 | ||
1255 | #ifdef CONFIG_PROC_FS | |
1256 | ||
1257 | static void *nr_info_start(struct seq_file *seq, loff_t *pos) | |
1258 | { | |
1259 | struct sock *s; | |
1260 | struct hlist_node *node; | |
1261 | int i = 1; | |
1262 | ||
1263 | spin_lock_bh(&nr_list_lock); | |
1264 | if (*pos == 0) | |
1265 | return SEQ_START_TOKEN; | |
1266 | ||
1267 | sk_for_each(s, node, &nr_list) { | |
1268 | if (i == *pos) | |
1269 | return s; | |
1270 | ++i; | |
1271 | } | |
1272 | return NULL; | |
1273 | } | |
1274 | ||
1275 | static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos) | |
1276 | { | |
1277 | ++*pos; | |
1278 | ||
5f8f59d6 | 1279 | return (v == SEQ_START_TOKEN) ? sk_head(&nr_list) |
1da177e4 LT |
1280 | : sk_next((struct sock *)v); |
1281 | } | |
5f8f59d6 | 1282 | |
1da177e4 LT |
1283 | static void nr_info_stop(struct seq_file *seq, void *v) |
1284 | { | |
1285 | spin_unlock_bh(&nr_list_lock); | |
1286 | } | |
1287 | ||
1288 | static int nr_info_show(struct seq_file *seq, void *v) | |
1289 | { | |
1290 | struct sock *s = v; | |
1291 | struct net_device *dev; | |
1292 | struct nr_sock *nr; | |
1293 | const char *devname; | |
f75268cd | 1294 | char buf[11]; |
1da177e4 LT |
1295 | |
1296 | if (v == SEQ_START_TOKEN) | |
1297 | seq_puts(seq, | |
1298 | "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"); | |
1299 | ||
1300 | else { | |
1301 | ||
1302 | bh_lock_sock(s); | |
1303 | nr = nr_sk(s); | |
1304 | ||
1305 | if ((dev = nr->device) == NULL) | |
1306 | devname = "???"; | |
1307 | else | |
1308 | devname = dev->name; | |
1309 | ||
f75268cd RB |
1310 | seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr)); |
1311 | seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr)); | |
5f8f59d6 | 1312 | seq_printf(seq, |
1da177e4 | 1313 | "%-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 | 1314 | ax2asc(buf, &nr->source_addr), |
1da177e4 LT |
1315 | devname, |
1316 | nr->my_index, | |
1317 | nr->my_id, | |
1318 | nr->your_index, | |
1319 | nr->your_id, | |
1320 | nr->state, | |
1321 | nr->vs, | |
1322 | nr->vr, | |
1323 | nr->va, | |
1324 | ax25_display_timer(&nr->t1timer) / HZ, | |
1325 | nr->t1 / HZ, | |
1326 | ax25_display_timer(&nr->t2timer) / HZ, | |
1327 | nr->t2 / HZ, | |
1328 | ax25_display_timer(&nr->t4timer) / HZ, | |
1329 | nr->t4 / HZ, | |
1330 | ax25_display_timer(&nr->idletimer) / (60 * HZ), | |
1331 | nr->idle / (60 * HZ), | |
1332 | nr->n2count, | |
1333 | nr->n2, | |
1334 | nr->window, | |
1335 | atomic_read(&s->sk_wmem_alloc), | |
1336 | atomic_read(&s->sk_rmem_alloc), | |
1337 | s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); | |
1338 | ||
1339 | bh_unlock_sock(s); | |
1340 | } | |
1341 | return 0; | |
1342 | } | |
1343 | ||
56b3d975 | 1344 | static const struct seq_operations nr_info_seqops = { |
1da177e4 LT |
1345 | .start = nr_info_start, |
1346 | .next = nr_info_next, | |
1347 | .stop = nr_info_stop, | |
1348 | .show = nr_info_show, | |
1349 | }; | |
5f8f59d6 | 1350 | |
1da177e4 LT |
1351 | static int nr_info_open(struct inode *inode, struct file *file) |
1352 | { | |
1353 | return seq_open(file, &nr_info_seqops); | |
1354 | } | |
5f8f59d6 | 1355 | |
da7071d7 | 1356 | static const struct file_operations nr_info_fops = { |
1da177e4 LT |
1357 | .owner = THIS_MODULE, |
1358 | .open = nr_info_open, | |
1359 | .read = seq_read, | |
1360 | .llseek = seq_lseek, | |
1361 | .release = seq_release, | |
1362 | }; | |
1363 | #endif /* CONFIG_PROC_FS */ | |
1364 | ||
1365 | static struct net_proto_family nr_family_ops = { | |
1366 | .family = PF_NETROM, | |
1367 | .create = nr_create, | |
1368 | .owner = THIS_MODULE, | |
1369 | }; | |
1370 | ||
90ddc4f0 | 1371 | static const struct proto_ops nr_proto_ops = { |
1da177e4 LT |
1372 | .family = PF_NETROM, |
1373 | .owner = THIS_MODULE, | |
1374 | .release = nr_release, | |
1375 | .bind = nr_bind, | |
1376 | .connect = nr_connect, | |
1377 | .socketpair = sock_no_socketpair, | |
1378 | .accept = nr_accept, | |
1379 | .getname = nr_getname, | |
1380 | .poll = datagram_poll, | |
1381 | .ioctl = nr_ioctl, | |
1382 | .listen = nr_listen, | |
1383 | .shutdown = sock_no_shutdown, | |
1384 | .setsockopt = nr_setsockopt, | |
1385 | .getsockopt = nr_getsockopt, | |
1386 | .sendmsg = nr_sendmsg, | |
1387 | .recvmsg = nr_recvmsg, | |
1388 | .mmap = sock_no_mmap, | |
1389 | .sendpage = sock_no_sendpage, | |
1390 | }; | |
1391 | ||
1392 | static struct notifier_block nr_dev_notifier = { | |
1393 | .notifier_call = nr_device_event, | |
1394 | }; | |
1395 | ||
1396 | static struct net_device **dev_nr; | |
1397 | ||
8d5cf596 RB |
1398 | static struct ax25_protocol nr_pid = { |
1399 | .pid = AX25_P_NETROM, | |
1400 | .func = nr_route_frame | |
1401 | }; | |
1402 | ||
a4282717 RB |
1403 | static struct ax25_linkfail nr_linkfail_notifier = { |
1404 | .func = nr_link_failed, | |
1405 | }; | |
1406 | ||
1da177e4 LT |
1407 | static int __init nr_proto_init(void) |
1408 | { | |
1409 | int i; | |
1410 | int rc = proto_register(&nr_proto, 0); | |
1411 | ||
1412 | if (rc != 0) | |
1413 | goto out; | |
1414 | ||
1415 | if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) { | |
1416 | printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n"); | |
1417 | return -1; | |
1418 | } | |
1419 | ||
1b30dd35 | 1420 | dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL); |
1da177e4 LT |
1421 | if (dev_nr == NULL) { |
1422 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n"); | |
1423 | return -1; | |
1424 | } | |
1425 | ||
1da177e4 LT |
1426 | for (i = 0; i < nr_ndevs; i++) { |
1427 | char name[IFNAMSIZ]; | |
1428 | struct net_device *dev; | |
1429 | ||
1430 | sprintf(name, "nr%d", i); | |
b88a762b | 1431 | dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup); |
1da177e4 LT |
1432 | if (!dev) { |
1433 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n"); | |
1434 | goto fail; | |
1435 | } | |
5f8f59d6 | 1436 | |
1da177e4 LT |
1437 | dev->base_addr = i; |
1438 | if (register_netdev(dev)) { | |
1439 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n"); | |
1440 | free_netdev(dev); | |
1441 | goto fail; | |
1442 | } | |
c773e847 | 1443 | nr_set_lockdep_key(dev); |
1da177e4 LT |
1444 | dev_nr[i] = dev; |
1445 | } | |
1446 | ||
1447 | if (sock_register(&nr_family_ops)) { | |
1448 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n"); | |
1449 | goto fail; | |
1450 | } | |
5f8f59d6 | 1451 | |
1da177e4 | 1452 | register_netdevice_notifier(&nr_dev_notifier); |
1da177e4 | 1453 | |
8d5cf596 | 1454 | ax25_register_pid(&nr_pid); |
a4282717 | 1455 | ax25_linkfail_register(&nr_linkfail_notifier); |
1da177e4 LT |
1456 | |
1457 | #ifdef CONFIG_SYSCTL | |
1458 | nr_register_sysctl(); | |
1459 | #endif | |
1460 | ||
1461 | nr_loopback_init(); | |
1462 | ||
457c4cbc EB |
1463 | proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops); |
1464 | proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops); | |
1465 | proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops); | |
1da177e4 LT |
1466 | out: |
1467 | return rc; | |
1468 | fail: | |
1469 | while (--i >= 0) { | |
1470 | unregister_netdev(dev_nr[i]); | |
1471 | free_netdev(dev_nr[i]); | |
1472 | } | |
1473 | kfree(dev_nr); | |
1474 | proto_unregister(&nr_proto); | |
1475 | rc = -1; | |
1476 | goto out; | |
1477 | } | |
1478 | ||
1479 | module_init(nr_proto_init); | |
1480 | ||
1481 | module_param(nr_ndevs, int, 0); | |
1482 | MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices"); | |
1483 | ||
1484 | MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); | |
1485 | MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol"); | |
1486 | MODULE_LICENSE("GPL"); | |
1487 | MODULE_ALIAS_NETPROTO(PF_NETROM); | |
1488 | ||
1489 | static void __exit nr_exit(void) | |
1490 | { | |
1491 | int i; | |
1492 | ||
457c4cbc EB |
1493 | proc_net_remove(&init_net, "nr"); |
1494 | proc_net_remove(&init_net, "nr_neigh"); | |
1495 | proc_net_remove(&init_net, "nr_nodes"); | |
1da177e4 LT |
1496 | nr_loopback_clear(); |
1497 | ||
1498 | nr_rt_free(); | |
1499 | ||
1500 | #ifdef CONFIG_SYSCTL | |
1501 | nr_unregister_sysctl(); | |
1502 | #endif | |
1503 | ||
a4282717 | 1504 | ax25_linkfail_release(&nr_linkfail_notifier); |
1da177e4 LT |
1505 | ax25_protocol_release(AX25_P_NETROM); |
1506 | ||
1507 | unregister_netdevice_notifier(&nr_dev_notifier); | |
1508 | ||
1509 | sock_unregister(PF_NETROM); | |
1510 | ||
1511 | for (i = 0; i < nr_ndevs; i++) { | |
1512 | struct net_device *dev = dev_nr[i]; | |
1513 | if (dev) { | |
1514 | unregister_netdev(dev); | |
1515 | free_netdev(dev); | |
1516 | } | |
1517 | } | |
1518 | ||
1519 | kfree(dev_nr); | |
1520 | proto_unregister(&nr_proto); | |
1521 | } | |
1522 | module_exit(nr_exit); |