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 | ||
e8a0464c DM |
77 | static void nr_set_lockdep_one(struct net_device *dev, |
78 | struct netdev_queue *txq, | |
79 | void *_unused) | |
c773e847 DM |
80 | { |
81 | lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key); | |
82 | } | |
83 | ||
84 | static void nr_set_lockdep_key(struct net_device *dev) | |
85 | { | |
e8a0464c | 86 | netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL); |
c773e847 DM |
87 | } |
88 | ||
1da177e4 LT |
89 | /* |
90 | * Socket removal during an interrupt is now safe. | |
91 | */ | |
92 | static void nr_remove_socket(struct sock *sk) | |
93 | { | |
94 | spin_lock_bh(&nr_list_lock); | |
95 | sk_del_node_init(sk); | |
96 | spin_unlock_bh(&nr_list_lock); | |
97 | } | |
98 | ||
99 | /* | |
100 | * Kill all bound sockets on a dropped device. | |
101 | */ | |
102 | static void nr_kill_by_device(struct net_device *dev) | |
103 | { | |
104 | struct sock *s; | |
105 | struct hlist_node *node; | |
106 | ||
107 | spin_lock_bh(&nr_list_lock); | |
108 | sk_for_each(s, node, &nr_list) | |
109 | if (nr_sk(s)->device == dev) | |
110 | nr_disconnect(s, ENETUNREACH); | |
111 | spin_unlock_bh(&nr_list_lock); | |
112 | } | |
113 | ||
114 | /* | |
115 | * Handle device status changes. | |
116 | */ | |
117 | static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
118 | { | |
119 | struct net_device *dev = (struct net_device *)ptr; | |
120 | ||
c346dca1 | 121 | if (dev_net(dev) != &init_net) |
e9dc8653 EB |
122 | return NOTIFY_DONE; |
123 | ||
1da177e4 LT |
124 | if (event != NETDEV_DOWN) |
125 | return NOTIFY_DONE; | |
126 | ||
127 | nr_kill_by_device(dev); | |
128 | nr_rt_device_down(dev); | |
5f8f59d6 | 129 | |
1da177e4 LT |
130 | return NOTIFY_DONE; |
131 | } | |
132 | ||
133 | /* | |
134 | * Add a socket to the bound sockets list. | |
135 | */ | |
136 | static void nr_insert_socket(struct sock *sk) | |
137 | { | |
138 | spin_lock_bh(&nr_list_lock); | |
139 | sk_add_node(sk, &nr_list); | |
140 | spin_unlock_bh(&nr_list_lock); | |
141 | } | |
142 | ||
143 | /* | |
144 | * Find a socket that wants to accept the Connect Request we just | |
145 | * received. | |
146 | */ | |
147 | static struct sock *nr_find_listener(ax25_address *addr) | |
148 | { | |
149 | struct sock *s; | |
150 | struct hlist_node *node; | |
151 | ||
152 | spin_lock_bh(&nr_list_lock); | |
153 | sk_for_each(s, node, &nr_list) | |
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; | |
171 | struct hlist_node *node; | |
172 | ||
173 | spin_lock_bh(&nr_list_lock); | |
174 | sk_for_each(s, node, &nr_list) { | |
175 | struct nr_sock *nr = nr_sk(s); | |
5f8f59d6 | 176 | |
1da177e4 LT |
177 | if (nr->my_index == index && nr->my_id == id) { |
178 | bh_lock_sock(s); | |
179 | goto found; | |
180 | } | |
181 | } | |
182 | s = NULL; | |
183 | found: | |
184 | spin_unlock_bh(&nr_list_lock); | |
185 | return s; | |
186 | } | |
187 | ||
188 | /* | |
189 | * Find a connected NET/ROM socket given their circuit IDs. | |
190 | */ | |
191 | static struct sock *nr_find_peer(unsigned char index, unsigned char id, | |
192 | ax25_address *dest) | |
193 | { | |
194 | struct sock *s; | |
195 | struct hlist_node *node; | |
196 | ||
197 | spin_lock_bh(&nr_list_lock); | |
198 | sk_for_each(s, node, &nr_list) { | |
199 | struct nr_sock *nr = nr_sk(s); | |
5f8f59d6 | 200 | |
1da177e4 LT |
201 | if (nr->your_index == index && nr->your_id == id && |
202 | !ax25cmp(&nr->dest_addr, dest)) { | |
5f8f59d6 | 203 | bh_lock_sock(s); |
1da177e4 LT |
204 | goto found; |
205 | } | |
206 | } | |
207 | s = NULL; | |
208 | found: | |
209 | spin_unlock_bh(&nr_list_lock); | |
210 | return s; | |
211 | } | |
212 | ||
213 | /* | |
214 | * Find next free circuit ID. | |
215 | */ | |
216 | static unsigned short nr_find_next_circuit(void) | |
217 | { | |
218 | unsigned short id = circuit; | |
219 | unsigned char i, j; | |
220 | struct sock *sk; | |
221 | ||
222 | for (;;) { | |
223 | i = id / 256; | |
224 | j = id % 256; | |
225 | ||
226 | if (i != 0 && j != 0) { | |
227 | if ((sk=nr_find_socket(i, j)) == NULL) | |
228 | break; | |
229 | bh_unlock_sock(sk); | |
230 | } | |
231 | ||
232 | id++; | |
233 | } | |
234 | ||
235 | return id; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Deferred destroy. | |
240 | */ | |
241 | void nr_destroy_socket(struct sock *); | |
242 | ||
243 | /* | |
244 | * Handler for deferred kills. | |
245 | */ | |
246 | static void nr_destroy_timer(unsigned long data) | |
247 | { | |
248 | struct sock *sk=(struct sock *)data; | |
249 | bh_lock_sock(sk); | |
250 | sock_hold(sk); | |
251 | nr_destroy_socket(sk); | |
252 | bh_unlock_sock(sk); | |
253 | sock_put(sk); | |
254 | } | |
255 | ||
256 | /* | |
257 | * This is called from user mode and the timers. Thus it protects itself | |
258 | * against interrupt users but doesn't worry about being called during | |
259 | * work. Once it is removed from the queue no interrupt or bottom half | |
260 | * will touch it and we are (fairly 8-) ) safe. | |
261 | */ | |
262 | void nr_destroy_socket(struct sock *sk) | |
263 | { | |
264 | struct sk_buff *skb; | |
265 | ||
266 | nr_remove_socket(sk); | |
267 | ||
268 | nr_stop_heartbeat(sk); | |
269 | nr_stop_t1timer(sk); | |
270 | nr_stop_t2timer(sk); | |
271 | nr_stop_t4timer(sk); | |
272 | nr_stop_idletimer(sk); | |
273 | ||
274 | nr_clear_queues(sk); /* Flush the queues */ | |
275 | ||
276 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
277 | if (skb->sk != sk) { /* A pending connection */ | |
278 | /* Queue the unaccepted socket for death */ | |
279 | sock_set_flag(skb->sk, SOCK_DEAD); | |
280 | nr_start_heartbeat(skb->sk); | |
281 | nr_sk(skb->sk)->state = NR_STATE_0; | |
282 | } | |
283 | ||
284 | kfree_skb(skb); | |
285 | } | |
286 | ||
287 | if (atomic_read(&sk->sk_wmem_alloc) || | |
288 | atomic_read(&sk->sk_rmem_alloc)) { | |
289 | /* Defer: outstanding buffers */ | |
290 | sk->sk_timer.function = nr_destroy_timer; | |
291 | sk->sk_timer.expires = jiffies + 2 * HZ; | |
292 | add_timer(&sk->sk_timer); | |
293 | } else | |
294 | sock_put(sk); | |
295 | } | |
296 | ||
297 | /* | |
298 | * Handling for system calls applied via the various interfaces to a | |
299 | * NET/ROM socket object. | |
300 | */ | |
301 | ||
302 | static int nr_setsockopt(struct socket *sock, int level, int optname, | |
303 | char __user *optval, int optlen) | |
304 | { | |
305 | struct sock *sk = sock->sk; | |
306 | struct nr_sock *nr = nr_sk(sk); | |
307 | int opt; | |
308 | ||
309 | if (level != SOL_NETROM) | |
310 | return -ENOPROTOOPT; | |
311 | ||
312 | if (optlen < sizeof(int)) | |
313 | return -EINVAL; | |
314 | ||
315 | if (get_user(opt, (int __user *)optval)) | |
316 | return -EFAULT; | |
317 | ||
318 | switch (optname) { | |
319 | case NETROM_T1: | |
320 | if (opt < 1) | |
321 | return -EINVAL; | |
322 | nr->t1 = opt * HZ; | |
323 | return 0; | |
324 | ||
325 | case NETROM_T2: | |
326 | if (opt < 1) | |
327 | return -EINVAL; | |
328 | nr->t2 = opt * HZ; | |
329 | return 0; | |
330 | ||
331 | case NETROM_N2: | |
332 | if (opt < 1 || opt > 31) | |
333 | return -EINVAL; | |
334 | nr->n2 = opt; | |
335 | return 0; | |
336 | ||
337 | case NETROM_T4: | |
338 | if (opt < 1) | |
339 | return -EINVAL; | |
340 | nr->t4 = opt * HZ; | |
341 | return 0; | |
342 | ||
343 | case NETROM_IDLE: | |
344 | if (opt < 0) | |
345 | return -EINVAL; | |
346 | nr->idle = opt * 60 * HZ; | |
347 | return 0; | |
348 | ||
349 | default: | |
350 | return -ENOPROTOOPT; | |
351 | } | |
352 | } | |
353 | ||
354 | static int nr_getsockopt(struct socket *sock, int level, int optname, | |
355 | char __user *optval, int __user *optlen) | |
356 | { | |
357 | struct sock *sk = sock->sk; | |
358 | struct nr_sock *nr = nr_sk(sk); | |
359 | int val = 0; | |
5f8f59d6 | 360 | int len; |
1da177e4 LT |
361 | |
362 | if (level != SOL_NETROM) | |
363 | return -ENOPROTOOPT; | |
5f8f59d6 | 364 | |
1da177e4 LT |
365 | if (get_user(len, optlen)) |
366 | return -EFAULT; | |
367 | ||
368 | if (len < 0) | |
369 | return -EINVAL; | |
5f8f59d6 | 370 | |
1da177e4 LT |
371 | switch (optname) { |
372 | case NETROM_T1: | |
373 | val = nr->t1 / HZ; | |
374 | break; | |
375 | ||
376 | case NETROM_T2: | |
377 | val = nr->t2 / HZ; | |
378 | break; | |
379 | ||
380 | case NETROM_N2: | |
381 | val = nr->n2; | |
382 | break; | |
383 | ||
384 | case NETROM_T4: | |
385 | val = nr->t4 / HZ; | |
386 | break; | |
387 | ||
388 | case NETROM_IDLE: | |
389 | val = nr->idle / (60 * HZ); | |
390 | break; | |
391 | ||
392 | default: | |
393 | return -ENOPROTOOPT; | |
394 | } | |
395 | ||
396 | len = min_t(unsigned int, len, sizeof(int)); | |
397 | ||
398 | if (put_user(len, optlen)) | |
399 | return -EFAULT; | |
400 | ||
401 | return copy_to_user(optval, &val, len) ? -EFAULT : 0; | |
402 | } | |
403 | ||
404 | static int nr_listen(struct socket *sock, int backlog) | |
405 | { | |
406 | struct sock *sk = sock->sk; | |
407 | ||
408 | lock_sock(sk); | |
409 | if (sk->sk_state != TCP_LISTEN) { | |
410 | memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN); | |
411 | sk->sk_max_ack_backlog = backlog; | |
412 | sk->sk_state = TCP_LISTEN; | |
413 | release_sock(sk); | |
414 | return 0; | |
415 | } | |
416 | release_sock(sk); | |
417 | ||
418 | return -EOPNOTSUPP; | |
419 | } | |
420 | ||
421 | static struct proto nr_proto = { | |
422 | .name = "NETROM", | |
423 | .owner = THIS_MODULE, | |
424 | .obj_size = sizeof(struct nr_sock), | |
425 | }; | |
426 | ||
1b8d7ae4 | 427 | static int nr_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
428 | { |
429 | struct sock *sk; | |
430 | struct nr_sock *nr; | |
431 | ||
1b8d7ae4 EB |
432 | if (net != &init_net) |
433 | return -EAFNOSUPPORT; | |
434 | ||
1da177e4 LT |
435 | if (sock->type != SOCK_SEQPACKET || protocol != 0) |
436 | return -ESOCKTNOSUPPORT; | |
437 | ||
6257ff21 PE |
438 | sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto); |
439 | if (sk == NULL) | |
1da177e4 LT |
440 | return -ENOMEM; |
441 | ||
442 | nr = nr_sk(sk); | |
443 | ||
444 | sock_init_data(sock, sk); | |
445 | ||
446 | sock->ops = &nr_proto_ops; | |
447 | sk->sk_protocol = protocol; | |
448 | ||
449 | skb_queue_head_init(&nr->ack_queue); | |
450 | skb_queue_head_init(&nr->reseq_queue); | |
451 | skb_queue_head_init(&nr->frag_queue); | |
452 | ||
453 | nr_init_timers(sk); | |
454 | ||
4d8937d0 RB |
455 | nr->t1 = |
456 | msecs_to_jiffies(sysctl_netrom_transport_timeout); | |
457 | nr->t2 = | |
458 | msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay); | |
459 | nr->n2 = | |
460 | msecs_to_jiffies(sysctl_netrom_transport_maximum_tries); | |
461 | nr->t4 = | |
462 | msecs_to_jiffies(sysctl_netrom_transport_busy_delay); | |
463 | nr->idle = | |
464 | msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout); | |
1da177e4 LT |
465 | nr->window = sysctl_netrom_transport_requested_window_size; |
466 | ||
467 | nr->bpqext = 1; | |
468 | nr->state = NR_STATE_0; | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | static struct sock *nr_make_new(struct sock *osk) | |
474 | { | |
475 | struct sock *sk; | |
476 | struct nr_sock *nr, *onr; | |
477 | ||
478 | if (osk->sk_type != SOCK_SEQPACKET) | |
479 | return NULL; | |
480 | ||
3b1e0a65 | 481 | sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot); |
6257ff21 | 482 | if (sk == NULL) |
1da177e4 LT |
483 | return NULL; |
484 | ||
485 | nr = nr_sk(sk); | |
486 | ||
487 | sock_init_data(NULL, sk); | |
488 | ||
489 | sk->sk_type = osk->sk_type; | |
1da177e4 LT |
490 | sk->sk_priority = osk->sk_priority; |
491 | sk->sk_protocol = osk->sk_protocol; | |
492 | sk->sk_rcvbuf = osk->sk_rcvbuf; | |
493 | sk->sk_sndbuf = osk->sk_sndbuf; | |
494 | sk->sk_state = TCP_ESTABLISHED; | |
53b924b3 | 495 | sock_copy_flags(sk, osk); |
1da177e4 LT |
496 | |
497 | skb_queue_head_init(&nr->ack_queue); | |
498 | skb_queue_head_init(&nr->reseq_queue); | |
499 | skb_queue_head_init(&nr->frag_queue); | |
500 | ||
501 | nr_init_timers(sk); | |
502 | ||
503 | onr = nr_sk(osk); | |
504 | ||
505 | nr->t1 = onr->t1; | |
506 | nr->t2 = onr->t2; | |
507 | nr->n2 = onr->n2; | |
508 | nr->t4 = onr->t4; | |
509 | nr->idle = onr->idle; | |
510 | nr->window = onr->window; | |
511 | ||
512 | nr->device = onr->device; | |
513 | nr->bpqext = onr->bpqext; | |
514 | ||
515 | return sk; | |
516 | } | |
517 | ||
518 | static int nr_release(struct socket *sock) | |
519 | { | |
520 | struct sock *sk = sock->sk; | |
521 | struct nr_sock *nr; | |
522 | ||
523 | if (sk == NULL) return 0; | |
524 | ||
525 | sock_hold(sk); | |
526 | lock_sock(sk); | |
527 | nr = nr_sk(sk); | |
528 | ||
529 | switch (nr->state) { | |
530 | case NR_STATE_0: | |
531 | case NR_STATE_1: | |
532 | case NR_STATE_2: | |
533 | nr_disconnect(sk, 0); | |
534 | nr_destroy_socket(sk); | |
535 | break; | |
536 | ||
537 | case NR_STATE_3: | |
538 | nr_clear_queues(sk); | |
539 | nr->n2count = 0; | |
540 | nr_write_internal(sk, NR_DISCREQ); | |
541 | nr_start_t1timer(sk); | |
542 | nr_stop_t2timer(sk); | |
543 | nr_stop_t4timer(sk); | |
544 | nr_stop_idletimer(sk); | |
545 | nr->state = NR_STATE_2; | |
546 | sk->sk_state = TCP_CLOSE; | |
547 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
548 | sk->sk_state_change(sk); | |
549 | sock_orphan(sk); | |
550 | sock_set_flag(sk, SOCK_DESTROY); | |
1da177e4 LT |
551 | break; |
552 | ||
553 | default: | |
1da177e4 LT |
554 | break; |
555 | } | |
556 | ||
5f8f59d6 | 557 | sock->sk = NULL; |
1da177e4 LT |
558 | release_sock(sk); |
559 | sock_put(sk); | |
560 | ||
561 | return 0; | |
562 | } | |
563 | ||
564 | static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
565 | { | |
566 | struct sock *sk = sock->sk; | |
567 | struct nr_sock *nr = nr_sk(sk); | |
568 | struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; | |
569 | struct net_device *dev; | |
01d7dd0e RB |
570 | ax25_uid_assoc *user; |
571 | ax25_address *source; | |
1da177e4 LT |
572 | |
573 | lock_sock(sk); | |
574 | if (!sock_flag(sk, SOCK_ZAPPED)) { | |
575 | release_sock(sk); | |
576 | return -EINVAL; | |
577 | } | |
578 | if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) { | |
579 | release_sock(sk); | |
580 | return -EINVAL; | |
581 | } | |
582 | if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) { | |
583 | release_sock(sk); | |
584 | return -EINVAL; | |
585 | } | |
586 | if (addr->fsa_ax25.sax25_family != AF_NETROM) { | |
587 | release_sock(sk); | |
588 | return -EINVAL; | |
589 | } | |
590 | if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) { | |
591 | SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n"); | |
592 | release_sock(sk); | |
593 | return -EADDRNOTAVAIL; | |
594 | } | |
595 | ||
596 | /* | |
597 | * Only the super user can set an arbitrary user callsign. | |
598 | */ | |
599 | if (addr->fsa_ax25.sax25_ndigis == 1) { | |
600 | if (!capable(CAP_NET_BIND_SERVICE)) { | |
601 | dev_put(dev); | |
602 | release_sock(sk); | |
603 | return -EACCES; | |
604 | } | |
605 | nr->user_addr = addr->fsa_digipeater[0]; | |
606 | nr->source_addr = addr->fsa_ax25.sax25_call; | |
607 | } else { | |
608 | source = &addr->fsa_ax25.sax25_call; | |
609 | ||
01d7dd0e RB |
610 | user = ax25_findbyuid(current->euid); |
611 | if (user) { | |
612 | nr->user_addr = user->call; | |
613 | ax25_uid_put(user); | |
614 | } else { | |
1da177e4 LT |
615 | if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { |
616 | release_sock(sk); | |
617 | dev_put(dev); | |
618 | return -EPERM; | |
619 | } | |
01d7dd0e | 620 | nr->user_addr = *source; |
1da177e4 LT |
621 | } |
622 | ||
1da177e4 LT |
623 | nr->source_addr = *source; |
624 | } | |
625 | ||
626 | nr->device = dev; | |
627 | nr_insert_socket(sk); | |
628 | ||
629 | sock_reset_flag(sk, SOCK_ZAPPED); | |
630 | dev_put(dev); | |
631 | release_sock(sk); | |
632 | SOCK_DEBUG(sk, "NET/ROM: socket is bound\n"); | |
633 | return 0; | |
634 | } | |
635 | ||
636 | static int nr_connect(struct socket *sock, struct sockaddr *uaddr, | |
637 | int addr_len, int flags) | |
638 | { | |
639 | struct sock *sk = sock->sk; | |
640 | struct nr_sock *nr = nr_sk(sk); | |
641 | struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr; | |
01d7dd0e RB |
642 | ax25_address *source = NULL; |
643 | ax25_uid_assoc *user; | |
1da177e4 | 644 | struct net_device *dev; |
75606dc6 | 645 | int err = 0; |
1da177e4 LT |
646 | |
647 | lock_sock(sk); | |
648 | if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { | |
649 | sock->state = SS_CONNECTED; | |
75606dc6 | 650 | goto out_release; /* Connect completed during a ERESTARTSYS event */ |
1da177e4 LT |
651 | } |
652 | ||
653 | if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { | |
654 | sock->state = SS_UNCONNECTED; | |
75606dc6 RB |
655 | err = -ECONNREFUSED; |
656 | goto out_release; | |
1da177e4 LT |
657 | } |
658 | ||
659 | if (sk->sk_state == TCP_ESTABLISHED) { | |
75606dc6 RB |
660 | err = -EISCONN; /* No reconnect on a seqpacket socket */ |
661 | goto out_release; | |
1da177e4 LT |
662 | } |
663 | ||
5f8f59d6 | 664 | sk->sk_state = TCP_CLOSE; |
1da177e4 LT |
665 | sock->state = SS_UNCONNECTED; |
666 | ||
667 | if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) { | |
75606dc6 RB |
668 | err = -EINVAL; |
669 | goto out_release; | |
1da177e4 LT |
670 | } |
671 | if (addr->sax25_family != AF_NETROM) { | |
75606dc6 RB |
672 | err = -EINVAL; |
673 | goto out_release; | |
1da177e4 LT |
674 | } |
675 | if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */ | |
676 | sock_reset_flag(sk, SOCK_ZAPPED); | |
677 | ||
678 | if ((dev = nr_dev_first()) == NULL) { | |
75606dc6 RB |
679 | err = -ENETUNREACH; |
680 | goto out_release; | |
1da177e4 LT |
681 | } |
682 | source = (ax25_address *)dev->dev_addr; | |
683 | ||
01d7dd0e RB |
684 | user = ax25_findbyuid(current->euid); |
685 | if (user) { | |
686 | nr->user_addr = user->call; | |
687 | ax25_uid_put(user); | |
688 | } else { | |
1da177e4 LT |
689 | if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) { |
690 | dev_put(dev); | |
75606dc6 RB |
691 | err = -EPERM; |
692 | goto out_release; | |
1da177e4 | 693 | } |
01d7dd0e | 694 | nr->user_addr = *source; |
1da177e4 LT |
695 | } |
696 | ||
1da177e4 LT |
697 | nr->source_addr = *source; |
698 | nr->device = dev; | |
699 | ||
700 | dev_put(dev); | |
701 | nr_insert_socket(sk); /* Finish the bind */ | |
702 | } | |
703 | ||
704 | nr->dest_addr = addr->sax25_call; | |
705 | ||
706 | release_sock(sk); | |
707 | circuit = nr_find_next_circuit(); | |
708 | lock_sock(sk); | |
709 | ||
710 | nr->my_index = circuit / 256; | |
711 | nr->my_id = circuit % 256; | |
712 | ||
713 | circuit++; | |
714 | ||
715 | /* Move to connecting socket, start sending Connect Requests */ | |
716 | sock->state = SS_CONNECTING; | |
717 | sk->sk_state = TCP_SYN_SENT; | |
718 | ||
719 | nr_establish_data_link(sk); | |
720 | ||
721 | nr->state = NR_STATE_1; | |
722 | ||
723 | nr_start_heartbeat(sk); | |
724 | ||
725 | /* Now the loop */ | |
726 | if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { | |
75606dc6 RB |
727 | err = -EINPROGRESS; |
728 | goto out_release; | |
1da177e4 | 729 | } |
5f8f59d6 | 730 | |
1da177e4 LT |
731 | /* |
732 | * A Connect Ack with Choke or timeout or failed routing will go to | |
733 | * closed. | |
734 | */ | |
735 | if (sk->sk_state == TCP_SYN_SENT) { | |
75606dc6 | 736 | DEFINE_WAIT(wait); |
1da177e4 | 737 | |
1da177e4 | 738 | for (;;) { |
75606dc6 | 739 | prepare_to_wait(sk->sk_sleep, &wait, |
639fc4c3 | 740 | TASK_INTERRUPTIBLE); |
1da177e4 LT |
741 | if (sk->sk_state != TCP_SYN_SENT) |
742 | break; | |
75606dc6 RB |
743 | if (!signal_pending(current)) { |
744 | release_sock(sk); | |
1da177e4 LT |
745 | schedule(); |
746 | lock_sock(sk); | |
747 | continue; | |
748 | } | |
75606dc6 RB |
749 | err = -ERESTARTSYS; |
750 | break; | |
1da177e4 | 751 | } |
75606dc6 RB |
752 | finish_wait(sk->sk_sleep, &wait); |
753 | if (err) | |
754 | goto out_release; | |
1da177e4 LT |
755 | } |
756 | ||
757 | if (sk->sk_state != TCP_ESTABLISHED) { | |
758 | sock->state = SS_UNCONNECTED; | |
75606dc6 RB |
759 | err = sock_error(sk); /* Always set at this point */ |
760 | goto out_release; | |
1da177e4 LT |
761 | } |
762 | ||
763 | sock->state = SS_CONNECTED; | |
75606dc6 RB |
764 | |
765 | out_release: | |
1da177e4 LT |
766 | release_sock(sk); |
767 | ||
75606dc6 | 768 | return err; |
1da177e4 LT |
769 | } |
770 | ||
771 | static int nr_accept(struct socket *sock, struct socket *newsock, int flags) | |
772 | { | |
1da177e4 LT |
773 | struct sk_buff *skb; |
774 | struct sock *newsk; | |
75606dc6 | 775 | DEFINE_WAIT(wait); |
1da177e4 LT |
776 | struct sock *sk; |
777 | int err = 0; | |
778 | ||
779 | if ((sk = sock->sk) == NULL) | |
780 | return -EINVAL; | |
781 | ||
782 | lock_sock(sk); | |
783 | if (sk->sk_type != SOCK_SEQPACKET) { | |
784 | err = -EOPNOTSUPP; | |
75606dc6 | 785 | goto out_release; |
1da177e4 LT |
786 | } |
787 | ||
788 | if (sk->sk_state != TCP_LISTEN) { | |
789 | err = -EINVAL; | |
75606dc6 | 790 | goto out_release; |
1da177e4 LT |
791 | } |
792 | ||
793 | /* | |
794 | * The write queue this time is holding sockets ready to use | |
795 | * hooked into the SABM we saved | |
796 | */ | |
1da177e4 | 797 | for (;;) { |
75606dc6 | 798 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
799 | skb = skb_dequeue(&sk->sk_receive_queue); |
800 | if (skb) | |
801 | break; | |
802 | ||
1da177e4 | 803 | if (flags & O_NONBLOCK) { |
75606dc6 RB |
804 | err = -EWOULDBLOCK; |
805 | break; | |
1da177e4 | 806 | } |
75606dc6 RB |
807 | if (!signal_pending(current)) { |
808 | release_sock(sk); | |
1da177e4 LT |
809 | schedule(); |
810 | lock_sock(sk); | |
811 | continue; | |
812 | } | |
75606dc6 RB |
813 | err = -ERESTARTSYS; |
814 | break; | |
1da177e4 | 815 | } |
75606dc6 RB |
816 | finish_wait(sk->sk_sleep, &wait); |
817 | if (err) | |
818 | goto out_release; | |
1da177e4 LT |
819 | |
820 | newsk = skb->sk; | |
7b66767f | 821 | sock_graft(newsk, newsock); |
1da177e4 LT |
822 | |
823 | /* Now attach up the new socket */ | |
824 | kfree_skb(skb); | |
18601a7d | 825 | sk_acceptq_removed(sk); |
1da177e4 | 826 | |
75606dc6 | 827 | out_release: |
1da177e4 | 828 | release_sock(sk); |
75606dc6 | 829 | |
1da177e4 LT |
830 | return err; |
831 | } | |
832 | ||
833 | static int nr_getname(struct socket *sock, struct sockaddr *uaddr, | |
834 | int *uaddr_len, int peer) | |
835 | { | |
836 | struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr; | |
837 | struct sock *sk = sock->sk; | |
838 | struct nr_sock *nr = nr_sk(sk); | |
839 | ||
840 | lock_sock(sk); | |
841 | if (peer != 0) { | |
842 | if (sk->sk_state != TCP_ESTABLISHED) { | |
843 | release_sock(sk); | |
844 | return -ENOTCONN; | |
845 | } | |
846 | sax->fsa_ax25.sax25_family = AF_NETROM; | |
847 | sax->fsa_ax25.sax25_ndigis = 1; | |
848 | sax->fsa_ax25.sax25_call = nr->user_addr; | |
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 LT |
1013 | if (!sock_flag(sk, SOCK_DEAD)) |
1014 | sk->sk_data_ready(sk, skb->len); | |
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 | ||
1026 | static int nr_sendmsg(struct kiocb *iocb, struct socket *sock, | |
1027 | struct msghdr *msg, size_t len) | |
1028 | { | |
1029 | struct sock *sk = sock->sk; | |
1030 | struct nr_sock *nr = nr_sk(sk); | |
1031 | struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name; | |
1032 | int err; | |
1033 | struct sockaddr_ax25 sax; | |
1034 | struct sk_buff *skb; | |
1035 | unsigned char *asmptr; | |
1036 | int size; | |
1037 | ||
1038 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) | |
1039 | return -EINVAL; | |
1040 | ||
1041 | lock_sock(sk); | |
1042 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
1043 | err = -EADDRNOTAVAIL; | |
1044 | goto out; | |
1045 | } | |
1046 | ||
1047 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
1048 | send_sig(SIGPIPE, current, 0); | |
1049 | err = -EPIPE; | |
1050 | goto out; | |
1051 | } | |
1052 | ||
1053 | if (nr->device == NULL) { | |
1054 | err = -ENETUNREACH; | |
1055 | goto out; | |
1056 | } | |
1057 | ||
1058 | if (usax) { | |
1059 | if (msg->msg_namelen < sizeof(sax)) { | |
1060 | err = -EINVAL; | |
1061 | goto out; | |
1062 | } | |
1063 | sax = *usax; | |
1064 | if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) { | |
1065 | err = -EISCONN; | |
1066 | goto out; | |
1067 | } | |
1068 | if (sax.sax25_family != AF_NETROM) { | |
1069 | err = -EINVAL; | |
1070 | goto out; | |
1071 | } | |
1072 | } else { | |
1073 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1074 | err = -ENOTCONN; | |
1075 | goto out; | |
1076 | } | |
1077 | sax.sax25_family = AF_NETROM; | |
1078 | sax.sax25_call = nr->dest_addr; | |
1079 | } | |
1080 | ||
1081 | SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n"); | |
1082 | ||
1083 | /* Build a packet */ | |
1084 | SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n"); | |
1085 | size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN; | |
1086 | ||
1087 | if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL) | |
1088 | goto out; | |
1089 | ||
1090 | skb_reserve(skb, size - len); | |
eeeb0374 | 1091 | skb_reset_transport_header(skb); |
1da177e4 LT |
1092 | |
1093 | /* | |
1094 | * Push down the NET/ROM header | |
1095 | */ | |
1096 | ||
1097 | asmptr = skb_push(skb, NR_TRANSPORT_LEN); | |
1098 | SOCK_DEBUG(sk, "Building NET/ROM Header.\n"); | |
1099 | ||
1100 | /* Build a NET/ROM Transport header */ | |
1101 | ||
1102 | *asmptr++ = nr->your_index; | |
1103 | *asmptr++ = nr->your_id; | |
1104 | *asmptr++ = 0; /* To be filled in later */ | |
1105 | *asmptr++ = 0; /* Ditto */ | |
1106 | *asmptr++ = NR_INFO; | |
1107 | SOCK_DEBUG(sk, "Built header.\n"); | |
1108 | ||
1109 | /* | |
1110 | * Put the data on the end | |
1111 | */ | |
eeeb0374 | 1112 | skb_put(skb, len); |
1da177e4 | 1113 | |
1da177e4 LT |
1114 | SOCK_DEBUG(sk, "NET/ROM: Appending user data\n"); |
1115 | ||
1116 | /* User data follows immediately after the NET/ROM transport header */ | |
eeeb0374 | 1117 | if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) { |
1da177e4 LT |
1118 | kfree_skb(skb); |
1119 | err = -EFAULT; | |
1120 | goto out; | |
1121 | } | |
1122 | ||
1123 | SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n"); | |
1124 | ||
1125 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1126 | kfree_skb(skb); | |
1127 | err = -ENOTCONN; | |
1128 | goto out; | |
1129 | } | |
1130 | ||
1131 | nr_output(sk, skb); /* Shove it onto the queue */ | |
1132 | ||
1133 | err = len; | |
1134 | out: | |
1135 | release_sock(sk); | |
1136 | return err; | |
1137 | } | |
1138 | ||
1139 | static int nr_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1140 | struct msghdr *msg, size_t size, int flags) | |
1141 | { | |
1142 | struct sock *sk = sock->sk; | |
1143 | struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name; | |
1144 | size_t copied; | |
1145 | struct sk_buff *skb; | |
1146 | int er; | |
1147 | ||
1148 | /* | |
1149 | * This works for seqpacket too. The receiver has ordered the queue for | |
1150 | * us! We do one quick check first though | |
1151 | */ | |
1152 | ||
1153 | lock_sock(sk); | |
1154 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1155 | release_sock(sk); | |
1156 | return -ENOTCONN; | |
1157 | } | |
1158 | ||
1159 | /* Now we can treat all alike */ | |
1160 | if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) { | |
1161 | release_sock(sk); | |
1162 | return er; | |
1163 | } | |
1164 | ||
badff6d0 | 1165 | skb_reset_transport_header(skb); |
1da177e4 LT |
1166 | copied = skb->len; |
1167 | ||
1168 | if (copied > size) { | |
1169 | copied = size; | |
1170 | msg->msg_flags |= MSG_TRUNC; | |
1171 | } | |
1172 | ||
1173 | skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1174 | ||
1175 | if (sax != NULL) { | |
1176 | sax->sax25_family = AF_NETROM; | |
d626f62b ACM |
1177 | skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call, |
1178 | AX25_ADDR_LEN); | |
1da177e4 LT |
1179 | } |
1180 | ||
1181 | msg->msg_namelen = sizeof(*sax); | |
1182 | ||
1183 | skb_free_datagram(sk, skb); | |
1184 | ||
1185 | release_sock(sk); | |
1186 | return copied; | |
1187 | } | |
1188 | ||
1189 | ||
1190 | static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1191 | { | |
1192 | struct sock *sk = sock->sk; | |
1193 | void __user *argp = (void __user *)arg; | |
1194 | int ret; | |
1195 | ||
1da177e4 LT |
1196 | switch (cmd) { |
1197 | case TIOCOUTQ: { | |
1198 | long amount; | |
5ff7630e CH |
1199 | |
1200 | lock_sock(sk); | |
1da177e4 LT |
1201 | amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); |
1202 | if (amount < 0) | |
1203 | amount = 0; | |
1204 | release_sock(sk); | |
1205 | return put_user(amount, (int __user *)argp); | |
1206 | } | |
1207 | ||
1208 | case TIOCINQ: { | |
1209 | struct sk_buff *skb; | |
1210 | long amount = 0L; | |
5ff7630e CH |
1211 | |
1212 | lock_sock(sk); | |
1da177e4 LT |
1213 | /* These two are safe on a single CPU system as only user tasks fiddle here */ |
1214 | if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) | |
1215 | amount = skb->len; | |
1216 | release_sock(sk); | |
1217 | return put_user(amount, (int __user *)argp); | |
1218 | } | |
1219 | ||
1220 | case SIOCGSTAMP: | |
5ff7630e | 1221 | lock_sock(sk); |
9b37ee75 | 1222 | ret = sock_get_timestamp(sk, argp); |
1da177e4 LT |
1223 | release_sock(sk); |
1224 | return ret; | |
1225 | ||
ae40eb1e ED |
1226 | case SIOCGSTAMPNS: |
1227 | lock_sock(sk); | |
1228 | ret = sock_get_timestampns(sk, argp); | |
1229 | release_sock(sk); | |
1230 | return ret; | |
1231 | ||
1da177e4 LT |
1232 | case SIOCGIFADDR: |
1233 | case SIOCSIFADDR: | |
1234 | case SIOCGIFDSTADDR: | |
1235 | case SIOCSIFDSTADDR: | |
1236 | case SIOCGIFBRDADDR: | |
1237 | case SIOCSIFBRDADDR: | |
1238 | case SIOCGIFNETMASK: | |
1239 | case SIOCSIFNETMASK: | |
1240 | case SIOCGIFMETRIC: | |
1241 | case SIOCSIFMETRIC: | |
1da177e4 LT |
1242 | return -EINVAL; |
1243 | ||
1244 | case SIOCADDRT: | |
1245 | case SIOCDELRT: | |
1246 | case SIOCNRDECOBS: | |
1da177e4 LT |
1247 | if (!capable(CAP_NET_ADMIN)) return -EPERM; |
1248 | return nr_rt_ioctl(cmd, argp); | |
1249 | ||
1250 | default: | |
b5e5fa5e | 1251 | return -ENOIOCTLCMD; |
1da177e4 | 1252 | } |
1da177e4 LT |
1253 | |
1254 | return 0; | |
1255 | } | |
1256 | ||
1257 | #ifdef CONFIG_PROC_FS | |
1258 | ||
1259 | static void *nr_info_start(struct seq_file *seq, loff_t *pos) | |
1260 | { | |
1261 | struct sock *s; | |
1262 | struct hlist_node *node; | |
1263 | int i = 1; | |
1264 | ||
1265 | spin_lock_bh(&nr_list_lock); | |
1266 | if (*pos == 0) | |
1267 | return SEQ_START_TOKEN; | |
1268 | ||
1269 | sk_for_each(s, node, &nr_list) { | |
1270 | if (i == *pos) | |
1271 | return s; | |
1272 | ++i; | |
1273 | } | |
1274 | return NULL; | |
1275 | } | |
1276 | ||
1277 | static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos) | |
1278 | { | |
1279 | ++*pos; | |
1280 | ||
5f8f59d6 | 1281 | return (v == SEQ_START_TOKEN) ? sk_head(&nr_list) |
1da177e4 LT |
1282 | : sk_next((struct sock *)v); |
1283 | } | |
5f8f59d6 | 1284 | |
1da177e4 LT |
1285 | static void nr_info_stop(struct seq_file *seq, void *v) |
1286 | { | |
1287 | spin_unlock_bh(&nr_list_lock); | |
1288 | } | |
1289 | ||
1290 | static int nr_info_show(struct seq_file *seq, void *v) | |
1291 | { | |
1292 | struct sock *s = v; | |
1293 | struct net_device *dev; | |
1294 | struct nr_sock *nr; | |
1295 | const char *devname; | |
f75268cd | 1296 | char buf[11]; |
1da177e4 LT |
1297 | |
1298 | if (v == SEQ_START_TOKEN) | |
1299 | seq_puts(seq, | |
1300 | "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"); | |
1301 | ||
1302 | else { | |
1303 | ||
1304 | bh_lock_sock(s); | |
1305 | nr = nr_sk(s); | |
1306 | ||
1307 | if ((dev = nr->device) == NULL) | |
1308 | devname = "???"; | |
1309 | else | |
1310 | devname = dev->name; | |
1311 | ||
f75268cd RB |
1312 | seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr)); |
1313 | seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr)); | |
5f8f59d6 | 1314 | seq_printf(seq, |
1da177e4 | 1315 | "%-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 | 1316 | ax2asc(buf, &nr->source_addr), |
1da177e4 LT |
1317 | devname, |
1318 | nr->my_index, | |
1319 | nr->my_id, | |
1320 | nr->your_index, | |
1321 | nr->your_id, | |
1322 | nr->state, | |
1323 | nr->vs, | |
1324 | nr->vr, | |
1325 | nr->va, | |
1326 | ax25_display_timer(&nr->t1timer) / HZ, | |
1327 | nr->t1 / HZ, | |
1328 | ax25_display_timer(&nr->t2timer) / HZ, | |
1329 | nr->t2 / HZ, | |
1330 | ax25_display_timer(&nr->t4timer) / HZ, | |
1331 | nr->t4 / HZ, | |
1332 | ax25_display_timer(&nr->idletimer) / (60 * HZ), | |
1333 | nr->idle / (60 * HZ), | |
1334 | nr->n2count, | |
1335 | nr->n2, | |
1336 | nr->window, | |
1337 | atomic_read(&s->sk_wmem_alloc), | |
1338 | atomic_read(&s->sk_rmem_alloc), | |
1339 | s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); | |
1340 | ||
1341 | bh_unlock_sock(s); | |
1342 | } | |
1343 | return 0; | |
1344 | } | |
1345 | ||
56b3d975 | 1346 | static const struct seq_operations nr_info_seqops = { |
1da177e4 LT |
1347 | .start = nr_info_start, |
1348 | .next = nr_info_next, | |
1349 | .stop = nr_info_stop, | |
1350 | .show = nr_info_show, | |
1351 | }; | |
5f8f59d6 | 1352 | |
1da177e4 LT |
1353 | static int nr_info_open(struct inode *inode, struct file *file) |
1354 | { | |
1355 | return seq_open(file, &nr_info_seqops); | |
1356 | } | |
5f8f59d6 | 1357 | |
da7071d7 | 1358 | static const struct file_operations nr_info_fops = { |
1da177e4 LT |
1359 | .owner = THIS_MODULE, |
1360 | .open = nr_info_open, | |
1361 | .read = seq_read, | |
1362 | .llseek = seq_lseek, | |
1363 | .release = seq_release, | |
1364 | }; | |
1365 | #endif /* CONFIG_PROC_FS */ | |
1366 | ||
1367 | static struct net_proto_family nr_family_ops = { | |
1368 | .family = PF_NETROM, | |
1369 | .create = nr_create, | |
1370 | .owner = THIS_MODULE, | |
1371 | }; | |
1372 | ||
90ddc4f0 | 1373 | static const struct proto_ops nr_proto_ops = { |
1da177e4 LT |
1374 | .family = PF_NETROM, |
1375 | .owner = THIS_MODULE, | |
1376 | .release = nr_release, | |
1377 | .bind = nr_bind, | |
1378 | .connect = nr_connect, | |
1379 | .socketpair = sock_no_socketpair, | |
1380 | .accept = nr_accept, | |
1381 | .getname = nr_getname, | |
1382 | .poll = datagram_poll, | |
1383 | .ioctl = nr_ioctl, | |
1384 | .listen = nr_listen, | |
1385 | .shutdown = sock_no_shutdown, | |
1386 | .setsockopt = nr_setsockopt, | |
1387 | .getsockopt = nr_getsockopt, | |
1388 | .sendmsg = nr_sendmsg, | |
1389 | .recvmsg = nr_recvmsg, | |
1390 | .mmap = sock_no_mmap, | |
1391 | .sendpage = sock_no_sendpage, | |
1392 | }; | |
1393 | ||
1394 | static struct notifier_block nr_dev_notifier = { | |
1395 | .notifier_call = nr_device_event, | |
1396 | }; | |
1397 | ||
1398 | static struct net_device **dev_nr; | |
1399 | ||
8d5cf596 RB |
1400 | static struct ax25_protocol nr_pid = { |
1401 | .pid = AX25_P_NETROM, | |
1402 | .func = nr_route_frame | |
1403 | }; | |
1404 | ||
a4282717 RB |
1405 | static struct ax25_linkfail nr_linkfail_notifier = { |
1406 | .func = nr_link_failed, | |
1407 | }; | |
1408 | ||
1da177e4 LT |
1409 | static int __init nr_proto_init(void) |
1410 | { | |
1411 | int i; | |
1412 | int rc = proto_register(&nr_proto, 0); | |
1413 | ||
1414 | if (rc != 0) | |
1415 | goto out; | |
1416 | ||
1417 | if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) { | |
1418 | printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n"); | |
1419 | return -1; | |
1420 | } | |
1421 | ||
1b30dd35 | 1422 | dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL); |
1da177e4 LT |
1423 | if (dev_nr == NULL) { |
1424 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n"); | |
1425 | return -1; | |
1426 | } | |
1427 | ||
1da177e4 LT |
1428 | for (i = 0; i < nr_ndevs; i++) { |
1429 | char name[IFNAMSIZ]; | |
1430 | struct net_device *dev; | |
1431 | ||
1432 | sprintf(name, "nr%d", i); | |
b88a762b | 1433 | dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup); |
1da177e4 LT |
1434 | if (!dev) { |
1435 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n"); | |
1436 | goto fail; | |
1437 | } | |
5f8f59d6 | 1438 | |
1da177e4 LT |
1439 | dev->base_addr = i; |
1440 | if (register_netdev(dev)) { | |
1441 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n"); | |
1442 | free_netdev(dev); | |
1443 | goto fail; | |
1444 | } | |
c773e847 | 1445 | nr_set_lockdep_key(dev); |
1da177e4 LT |
1446 | dev_nr[i] = dev; |
1447 | } | |
1448 | ||
1449 | if (sock_register(&nr_family_ops)) { | |
1450 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n"); | |
1451 | goto fail; | |
1452 | } | |
5f8f59d6 | 1453 | |
1da177e4 | 1454 | register_netdevice_notifier(&nr_dev_notifier); |
1da177e4 | 1455 | |
8d5cf596 | 1456 | ax25_register_pid(&nr_pid); |
a4282717 | 1457 | ax25_linkfail_register(&nr_linkfail_notifier); |
1da177e4 LT |
1458 | |
1459 | #ifdef CONFIG_SYSCTL | |
1460 | nr_register_sysctl(); | |
1461 | #endif | |
1462 | ||
1463 | nr_loopback_init(); | |
1464 | ||
457c4cbc EB |
1465 | proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops); |
1466 | proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops); | |
1467 | proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops); | |
1da177e4 LT |
1468 | out: |
1469 | return rc; | |
1470 | fail: | |
1471 | while (--i >= 0) { | |
1472 | unregister_netdev(dev_nr[i]); | |
1473 | free_netdev(dev_nr[i]); | |
1474 | } | |
1475 | kfree(dev_nr); | |
1476 | proto_unregister(&nr_proto); | |
1477 | rc = -1; | |
1478 | goto out; | |
1479 | } | |
1480 | ||
1481 | module_init(nr_proto_init); | |
1482 | ||
1483 | module_param(nr_ndevs, int, 0); | |
1484 | MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices"); | |
1485 | ||
1486 | MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); | |
1487 | MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol"); | |
1488 | MODULE_LICENSE("GPL"); | |
1489 | MODULE_ALIAS_NETPROTO(PF_NETROM); | |
1490 | ||
1491 | static void __exit nr_exit(void) | |
1492 | { | |
1493 | int i; | |
1494 | ||
457c4cbc EB |
1495 | proc_net_remove(&init_net, "nr"); |
1496 | proc_net_remove(&init_net, "nr_neigh"); | |
1497 | proc_net_remove(&init_net, "nr_nodes"); | |
1da177e4 LT |
1498 | nr_loopback_clear(); |
1499 | ||
1500 | nr_rt_free(); | |
1501 | ||
1502 | #ifdef CONFIG_SYSCTL | |
1503 | nr_unregister_sysctl(); | |
1504 | #endif | |
1505 | ||
a4282717 | 1506 | ax25_linkfail_release(&nr_linkfail_notifier); |
1da177e4 LT |
1507 | ax25_protocol_release(AX25_P_NETROM); |
1508 | ||
1509 | unregister_netdevice_notifier(&nr_dev_notifier); | |
1510 | ||
1511 | sock_unregister(PF_NETROM); | |
1512 | ||
1513 | for (i = 0; i < nr_ndevs; i++) { | |
1514 | struct net_device *dev = dev_nr[i]; | |
1515 | if (dev) { | |
1516 | unregister_netdev(dev); | |
1517 | free_netdev(dev); | |
1518 | } | |
1519 | } | |
1520 | ||
1521 | kfree(dev_nr); | |
1522 | proto_unregister(&nr_proto); | |
1523 | } | |
1524 | module_exit(nr_exit); |