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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 | */ | |
11 | #include <linux/module.h> | |
12 | #include <linux/moduleparam.h> | |
13 | #include <linux/capability.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/socket.h> | |
17 | #include <linux/in.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/timer.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/sockios.h> | |
24 | #include <linux/net.h> | |
25 | #include <linux/stat.h> | |
26 | #include <net/ax25.h> | |
27 | #include <linux/inet.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/if_arp.h> | |
30 | #include <linux/skbuff.h> | |
31 | #include <net/net_namespace.h> | |
32 | #include <net/sock.h> | |
33 | #include <asm/uaccess.h> | |
34 | #include <asm/system.h> | |
35 | #include <linux/fcntl.h> | |
36 | #include <linux/termios.h> /* For TIOCINQ/OUTQ */ | |
37 | #include <linux/mm.h> | |
38 | #include <linux/interrupt.h> | |
39 | #include <linux/notifier.h> | |
40 | #include <net/netrom.h> | |
41 | #include <linux/proc_fs.h> | |
42 | #include <linux/seq_file.h> | |
43 | #include <net/ip.h> | |
44 | #include <net/tcp_states.h> | |
45 | #include <net/arp.h> | |
46 | #include <linux/init.h> | |
47 | ||
48 | static int nr_ndevs = 4; | |
49 | ||
50 | int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL; | |
51 | int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS; | |
52 | int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL; | |
53 | int sysctl_netrom_transport_timeout = NR_DEFAULT_T1; | |
54 | int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2; | |
55 | int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2; | |
56 | int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4; | |
57 | int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW; | |
58 | int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE; | |
59 | int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING; | |
60 | int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS; | |
61 | int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET; | |
62 | ||
63 | static unsigned short circuit = 0x101; | |
64 | ||
65 | static HLIST_HEAD(nr_list); | |
66 | static DEFINE_SPINLOCK(nr_list_lock); | |
67 | ||
68 | static const struct proto_ops nr_proto_ops; | |
69 | ||
70 | /* | |
71 | * NETROM network devices are virtual network devices encapsulating NETROM | |
72 | * frames into AX.25 which will be sent through an AX.25 device, so form a | |
73 | * special "super class" of normal net devices; split their locks off into a | |
74 | * separate class since they always nest. | |
75 | */ | |
76 | static struct lock_class_key nr_netdev_xmit_lock_key; | |
77 | static struct lock_class_key nr_netdev_addr_lock_key; | |
78 | ||
79 | static void nr_set_lockdep_one(struct net_device *dev, | |
80 | struct netdev_queue *txq, | |
81 | void *_unused) | |
82 | { | |
83 | lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key); | |
84 | } | |
85 | ||
86 | static void nr_set_lockdep_key(struct net_device *dev) | |
87 | { | |
88 | lockdep_set_class(&dev->addr_list_lock, &nr_netdev_addr_lock_key); | |
89 | netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL); | |
90 | } | |
91 | ||
92 | /* | |
93 | * Socket removal during an interrupt is now safe. | |
94 | */ | |
95 | static void nr_remove_socket(struct sock *sk) | |
96 | { | |
97 | spin_lock_bh(&nr_list_lock); | |
98 | sk_del_node_init(sk); | |
99 | spin_unlock_bh(&nr_list_lock); | |
100 | } | |
101 | ||
102 | /* | |
103 | * Kill all bound sockets on a dropped device. | |
104 | */ | |
105 | static void nr_kill_by_device(struct net_device *dev) | |
106 | { | |
107 | struct sock *s; | |
108 | struct hlist_node *node; | |
109 | ||
110 | spin_lock_bh(&nr_list_lock); | |
111 | sk_for_each(s, node, &nr_list) | |
112 | if (nr_sk(s)->device == dev) | |
113 | nr_disconnect(s, ENETUNREACH); | |
114 | spin_unlock_bh(&nr_list_lock); | |
115 | } | |
116 | ||
117 | /* | |
118 | * Handle device status changes. | |
119 | */ | |
120 | static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
121 | { | |
122 | struct net_device *dev = (struct net_device *)ptr; | |
123 | ||
124 | if (!net_eq(dev_net(dev), &init_net)) | |
125 | return NOTIFY_DONE; | |
126 | ||
127 | if (event != NETDEV_DOWN) | |
128 | return NOTIFY_DONE; | |
129 | ||
130 | nr_kill_by_device(dev); | |
131 | nr_rt_device_down(dev); | |
132 | ||
133 | return NOTIFY_DONE; | |
134 | } | |
135 | ||
136 | /* | |
137 | * Add a socket to the bound sockets list. | |
138 | */ | |
139 | static void nr_insert_socket(struct sock *sk) | |
140 | { | |
141 | spin_lock_bh(&nr_list_lock); | |
142 | sk_add_node(sk, &nr_list); | |
143 | spin_unlock_bh(&nr_list_lock); | |
144 | } | |
145 | ||
146 | /* | |
147 | * Find a socket that wants to accept the Connect Request we just | |
148 | * received. | |
149 | */ | |
150 | static struct sock *nr_find_listener(ax25_address *addr) | |
151 | { | |
152 | struct sock *s; | |
153 | struct hlist_node *node; | |
154 | ||
155 | spin_lock_bh(&nr_list_lock); | |
156 | sk_for_each(s, node, &nr_list) | |
157 | if (!ax25cmp(&nr_sk(s)->source_addr, addr) && | |
158 | s->sk_state == TCP_LISTEN) { | |
159 | bh_lock_sock(s); | |
160 | goto found; | |
161 | } | |
162 | s = NULL; | |
163 | found: | |
164 | spin_unlock_bh(&nr_list_lock); | |
165 | return s; | |
166 | } | |
167 | ||
168 | /* | |
169 | * Find a connected NET/ROM socket given my circuit IDs. | |
170 | */ | |
171 | static struct sock *nr_find_socket(unsigned char index, unsigned char id) | |
172 | { | |
173 | struct sock *s; | |
174 | struct hlist_node *node; | |
175 | ||
176 | spin_lock_bh(&nr_list_lock); | |
177 | sk_for_each(s, node, &nr_list) { | |
178 | struct nr_sock *nr = nr_sk(s); | |
179 | ||
180 | if (nr->my_index == index && nr->my_id == id) { | |
181 | bh_lock_sock(s); | |
182 | goto found; | |
183 | } | |
184 | } | |
185 | s = NULL; | |
186 | found: | |
187 | spin_unlock_bh(&nr_list_lock); | |
188 | return s; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Find a connected NET/ROM socket given their circuit IDs. | |
193 | */ | |
194 | static struct sock *nr_find_peer(unsigned char index, unsigned char id, | |
195 | ax25_address *dest) | |
196 | { | |
197 | struct sock *s; | |
198 | struct hlist_node *node; | |
199 | ||
200 | spin_lock_bh(&nr_list_lock); | |
201 | sk_for_each(s, node, &nr_list) { | |
202 | struct nr_sock *nr = nr_sk(s); | |
203 | ||
204 | if (nr->your_index == index && nr->your_id == id && | |
205 | !ax25cmp(&nr->dest_addr, dest)) { | |
206 | bh_lock_sock(s); | |
207 | goto found; | |
208 | } | |
209 | } | |
210 | s = NULL; | |
211 | found: | |
212 | spin_unlock_bh(&nr_list_lock); | |
213 | return s; | |
214 | } | |
215 | ||
216 | /* | |
217 | * Find next free circuit ID. | |
218 | */ | |
219 | static unsigned short nr_find_next_circuit(void) | |
220 | { | |
221 | unsigned short id = circuit; | |
222 | unsigned char i, j; | |
223 | struct sock *sk; | |
224 | ||
225 | for (;;) { | |
226 | i = id / 256; | |
227 | j = id % 256; | |
228 | ||
229 | if (i != 0 && j != 0) { | |
230 | if ((sk=nr_find_socket(i, j)) == NULL) | |
231 | break; | |
232 | bh_unlock_sock(sk); | |
233 | } | |
234 | ||
235 | id++; | |
236 | } | |
237 | ||
238 | return id; | |
239 | } | |
240 | ||
241 | /* | |
242 | * Deferred destroy. | |
243 | */ | |
244 | void nr_destroy_socket(struct sock *); | |
245 | ||
246 | /* | |
247 | * Handler for deferred kills. | |
248 | */ | |
249 | static void nr_destroy_timer(unsigned long data) | |
250 | { | |
251 | struct sock *sk=(struct sock *)data; | |
252 | bh_lock_sock(sk); | |
253 | sock_hold(sk); | |
254 | nr_destroy_socket(sk); | |
255 | bh_unlock_sock(sk); | |
256 | sock_put(sk); | |
257 | } | |
258 | ||
259 | /* | |
260 | * This is called from user mode and the timers. Thus it protects itself | |
261 | * against interrupt users but doesn't worry about being called during | |
262 | * work. Once it is removed from the queue no interrupt or bottom half | |
263 | * will touch it and we are (fairly 8-) ) safe. | |
264 | */ | |
265 | void nr_destroy_socket(struct sock *sk) | |
266 | { | |
267 | struct sk_buff *skb; | |
268 | ||
269 | nr_remove_socket(sk); | |
270 | ||
271 | nr_stop_heartbeat(sk); | |
272 | nr_stop_t1timer(sk); | |
273 | nr_stop_t2timer(sk); | |
274 | nr_stop_t4timer(sk); | |
275 | nr_stop_idletimer(sk); | |
276 | ||
277 | nr_clear_queues(sk); /* Flush the queues */ | |
278 | ||
279 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
280 | if (skb->sk != sk) { /* A pending connection */ | |
281 | /* Queue the unaccepted socket for death */ | |
282 | sock_set_flag(skb->sk, SOCK_DEAD); | |
283 | nr_start_heartbeat(skb->sk); | |
284 | nr_sk(skb->sk)->state = NR_STATE_0; | |
285 | } | |
286 | ||
287 | kfree_skb(skb); | |
288 | } | |
289 | ||
290 | if (sk_has_allocations(sk)) { | |
291 | /* Defer: outstanding buffers */ | |
292 | sk->sk_timer.function = nr_destroy_timer; | |
293 | sk->sk_timer.expires = jiffies + 2 * HZ; | |
294 | add_timer(&sk->sk_timer); | |
295 | } else | |
296 | sock_put(sk); | |
297 | } | |
298 | ||
299 | /* | |
300 | * Handling for system calls applied via the various interfaces to a | |
301 | * NET/ROM socket object. | |
302 | */ | |
303 | ||
304 | static int nr_setsockopt(struct socket *sock, int level, int optname, | |
305 | char __user *optval, unsigned int optlen) | |
306 | { | |
307 | struct sock *sk = sock->sk; | |
308 | struct nr_sock *nr = nr_sk(sk); | |
309 | int opt; | |
310 | ||
311 | if (level != SOL_NETROM) | |
312 | return -ENOPROTOOPT; | |
313 | ||
314 | if (optlen < sizeof(int)) | |
315 | return -EINVAL; | |
316 | ||
317 | if (get_user(opt, (int __user *)optval)) | |
318 | return -EFAULT; | |
319 | ||
320 | switch (optname) { | |
321 | case NETROM_T1: | |
322 | if (opt < 1) | |
323 | return -EINVAL; | |
324 | nr->t1 = opt * HZ; | |
325 | return 0; | |
326 | ||
327 | case NETROM_T2: | |
328 | if (opt < 1) | |
329 | return -EINVAL; | |
330 | nr->t2 = opt * HZ; | |
331 | return 0; | |
332 | ||
333 | case NETROM_N2: | |
334 | if (opt < 1 || opt > 31) | |
335 | return -EINVAL; | |
336 | nr->n2 = opt; | |
337 | return 0; | |
338 | ||
339 | case NETROM_T4: | |
340 | if (opt < 1) | |
341 | return -EINVAL; | |
342 | nr->t4 = opt * HZ; | |
343 | return 0; | |
344 | ||
345 | case NETROM_IDLE: | |
346 | if (opt < 0) | |
347 | return -EINVAL; | |
348 | nr->idle = opt * 60 * HZ; | |
349 | return 0; | |
350 | ||
351 | default: | |
352 | return -ENOPROTOOPT; | |
353 | } | |
354 | } | |
355 | ||
356 | static int nr_getsockopt(struct socket *sock, int level, int optname, | |
357 | char __user *optval, int __user *optlen) | |
358 | { | |
359 | struct sock *sk = sock->sk; | |
360 | struct nr_sock *nr = nr_sk(sk); | |
361 | int val = 0; | |
362 | int len; | |
363 | ||
364 | if (level != SOL_NETROM) | |
365 | return -ENOPROTOOPT; | |
366 | ||
367 | if (get_user(len, optlen)) | |
368 | return -EFAULT; | |
369 | ||
370 | if (len < 0) | |
371 | return -EINVAL; | |
372 | ||
373 | switch (optname) { | |
374 | case NETROM_T1: | |
375 | val = nr->t1 / HZ; | |
376 | break; | |
377 | ||
378 | case NETROM_T2: | |
379 | val = nr->t2 / HZ; | |
380 | break; | |
381 | ||
382 | case NETROM_N2: | |
383 | val = nr->n2; | |
384 | break; | |
385 | ||
386 | case NETROM_T4: | |
387 | val = nr->t4 / HZ; | |
388 | break; | |
389 | ||
390 | case NETROM_IDLE: | |
391 | val = nr->idle / (60 * HZ); | |
392 | break; | |
393 | ||
394 | default: | |
395 | return -ENOPROTOOPT; | |
396 | } | |
397 | ||
398 | len = min_t(unsigned int, len, sizeof(int)); | |
399 | ||
400 | if (put_user(len, optlen)) | |
401 | return -EFAULT; | |
402 | ||
403 | return copy_to_user(optval, &val, len) ? -EFAULT : 0; | |
404 | } | |
405 | ||
406 | static int nr_listen(struct socket *sock, int backlog) | |
407 | { | |
408 | struct sock *sk = sock->sk; | |
409 | ||
410 | lock_sock(sk); | |
411 | if (sk->sk_state != TCP_LISTEN) { | |
412 | memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN); | |
413 | sk->sk_max_ack_backlog = backlog; | |
414 | sk->sk_state = TCP_LISTEN; | |
415 | release_sock(sk); | |
416 | return 0; | |
417 | } | |
418 | release_sock(sk); | |
419 | ||
420 | return -EOPNOTSUPP; | |
421 | } | |
422 | ||
423 | static struct proto nr_proto = { | |
424 | .name = "NETROM", | |
425 | .owner = THIS_MODULE, | |
426 | .obj_size = sizeof(struct nr_sock), | |
427 | }; | |
428 | ||
429 | static int nr_create(struct net *net, struct socket *sock, int protocol, | |
430 | int kern) | |
431 | { | |
432 | struct sock *sk; | |
433 | struct nr_sock *nr; | |
434 | ||
435 | if (!net_eq(net, &init_net)) | |
436 | return -EAFNOSUPPORT; | |
437 | ||
438 | if (sock->type != SOCK_SEQPACKET || protocol != 0) | |
439 | return -ESOCKTNOSUPPORT; | |
440 | ||
441 | sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto); | |
442 | if (sk == NULL) | |
443 | return -ENOMEM; | |
444 | ||
445 | nr = nr_sk(sk); | |
446 | ||
447 | sock_init_data(sock, sk); | |
448 | ||
449 | sock->ops = &nr_proto_ops; | |
450 | sk->sk_protocol = protocol; | |
451 | ||
452 | skb_queue_head_init(&nr->ack_queue); | |
453 | skb_queue_head_init(&nr->reseq_queue); | |
454 | skb_queue_head_init(&nr->frag_queue); | |
455 | ||
456 | nr_init_timers(sk); | |
457 | ||
458 | nr->t1 = | |
459 | msecs_to_jiffies(sysctl_netrom_transport_timeout); | |
460 | nr->t2 = | |
461 | msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay); | |
462 | nr->n2 = | |
463 | msecs_to_jiffies(sysctl_netrom_transport_maximum_tries); | |
464 | nr->t4 = | |
465 | msecs_to_jiffies(sysctl_netrom_transport_busy_delay); | |
466 | nr->idle = | |
467 | msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout); | |
468 | nr->window = sysctl_netrom_transport_requested_window_size; | |
469 | ||
470 | nr->bpqext = 1; | |
471 | nr->state = NR_STATE_0; | |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
476 | static struct sock *nr_make_new(struct sock *osk) | |
477 | { | |
478 | struct sock *sk; | |
479 | struct nr_sock *nr, *onr; | |
480 | ||
481 | if (osk->sk_type != SOCK_SEQPACKET) | |
482 | return NULL; | |
483 | ||
484 | sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot); | |
485 | if (sk == NULL) | |
486 | return NULL; | |
487 | ||
488 | nr = nr_sk(sk); | |
489 | ||
490 | sock_init_data(NULL, sk); | |
491 | ||
492 | sk->sk_type = osk->sk_type; | |
493 | sk->sk_priority = osk->sk_priority; | |
494 | sk->sk_protocol = osk->sk_protocol; | |
495 | sk->sk_rcvbuf = osk->sk_rcvbuf; | |
496 | sk->sk_sndbuf = osk->sk_sndbuf; | |
497 | sk->sk_state = TCP_ESTABLISHED; | |
498 | sock_copy_flags(sk, osk); | |
499 | ||
500 | skb_queue_head_init(&nr->ack_queue); | |
501 | skb_queue_head_init(&nr->reseq_queue); | |
502 | skb_queue_head_init(&nr->frag_queue); | |
503 | ||
504 | nr_init_timers(sk); | |
505 | ||
506 | onr = nr_sk(osk); | |
507 | ||
508 | nr->t1 = onr->t1; | |
509 | nr->t2 = onr->t2; | |
510 | nr->n2 = onr->n2; | |
511 | nr->t4 = onr->t4; | |
512 | nr->idle = onr->idle; | |
513 | nr->window = onr->window; | |
514 | ||
515 | nr->device = onr->device; | |
516 | nr->bpqext = onr->bpqext; | |
517 | ||
518 | return sk; | |
519 | } | |
520 | ||
521 | static int nr_release(struct socket *sock) | |
522 | { | |
523 | struct sock *sk = sock->sk; | |
524 | struct nr_sock *nr; | |
525 | ||
526 | if (sk == NULL) return 0; | |
527 | ||
528 | sock_hold(sk); | |
529 | sock_orphan(sk); | |
530 | lock_sock(sk); | |
531 | nr = nr_sk(sk); | |
532 | ||
533 | switch (nr->state) { | |
534 | case NR_STATE_0: | |
535 | case NR_STATE_1: | |
536 | case NR_STATE_2: | |
537 | nr_disconnect(sk, 0); | |
538 | nr_destroy_socket(sk); | |
539 | break; | |
540 | ||
541 | case NR_STATE_3: | |
542 | nr_clear_queues(sk); | |
543 | nr->n2count = 0; | |
544 | nr_write_internal(sk, NR_DISCREQ); | |
545 | nr_start_t1timer(sk); | |
546 | nr_stop_t2timer(sk); | |
547 | nr_stop_t4timer(sk); | |
548 | nr_stop_idletimer(sk); | |
549 | nr->state = NR_STATE_2; | |
550 | sk->sk_state = TCP_CLOSE; | |
551 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
552 | sk->sk_state_change(sk); | |
553 | sock_set_flag(sk, SOCK_DESTROY); | |
554 | break; | |
555 | ||
556 | default: | |
557 | break; | |
558 | } | |
559 | ||
560 | sock->sk = NULL; | |
561 | release_sock(sk); | |
562 | sock_put(sk); | |
563 | ||
564 | return 0; | |
565 | } | |
566 | ||
567 | static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
568 | { | |
569 | struct sock *sk = sock->sk; | |
570 | struct nr_sock *nr = nr_sk(sk); | |
571 | struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; | |
572 | struct net_device *dev; | |
573 | ax25_uid_assoc *user; | |
574 | ax25_address *source; | |
575 | ||
576 | lock_sock(sk); | |
577 | if (!sock_flag(sk, SOCK_ZAPPED)) { | |
578 | release_sock(sk); | |
579 | return -EINVAL; | |
580 | } | |
581 | if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) { | |
582 | release_sock(sk); | |
583 | return -EINVAL; | |
584 | } | |
585 | if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) { | |
586 | release_sock(sk); | |
587 | return -EINVAL; | |
588 | } | |
589 | if (addr->fsa_ax25.sax25_family != AF_NETROM) { | |
590 | release_sock(sk); | |
591 | return -EINVAL; | |
592 | } | |
593 | if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) { | |
594 | release_sock(sk); | |
595 | return -EADDRNOTAVAIL; | |
596 | } | |
597 | ||
598 | /* | |
599 | * Only the super user can set an arbitrary user callsign. | |
600 | */ | |
601 | if (addr->fsa_ax25.sax25_ndigis == 1) { | |
602 | if (!capable(CAP_NET_BIND_SERVICE)) { | |
603 | dev_put(dev); | |
604 | release_sock(sk); | |
605 | return -EACCES; | |
606 | } | |
607 | nr->user_addr = addr->fsa_digipeater[0]; | |
608 | nr->source_addr = addr->fsa_ax25.sax25_call; | |
609 | } else { | |
610 | source = &addr->fsa_ax25.sax25_call; | |
611 | ||
612 | user = ax25_findbyuid(current_euid()); | |
613 | if (user) { | |
614 | nr->user_addr = user->call; | |
615 | ax25_uid_put(user); | |
616 | } else { | |
617 | if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { | |
618 | release_sock(sk); | |
619 | dev_put(dev); | |
620 | return -EPERM; | |
621 | } | |
622 | nr->user_addr = *source; | |
623 | } | |
624 | ||
625 | nr->source_addr = *source; | |
626 | } | |
627 | ||
628 | nr->device = dev; | |
629 | nr_insert_socket(sk); | |
630 | ||
631 | sock_reset_flag(sk, SOCK_ZAPPED); | |
632 | dev_put(dev); | |
633 | release_sock(sk); | |
634 | ||
635 | return 0; | |
636 | } | |
637 | ||
638 | static int nr_connect(struct socket *sock, struct sockaddr *uaddr, | |
639 | int addr_len, int flags) | |
640 | { | |
641 | struct sock *sk = sock->sk; | |
642 | struct nr_sock *nr = nr_sk(sk); | |
643 | struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr; | |
644 | ax25_address *source = NULL; | |
645 | ax25_uid_assoc *user; | |
646 | struct net_device *dev; | |
647 | int err = 0; | |
648 | ||
649 | lock_sock(sk); | |
650 | if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { | |
651 | sock->state = SS_CONNECTED; | |
652 | goto out_release; /* Connect completed during a ERESTARTSYS event */ | |
653 | } | |
654 | ||
655 | if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { | |
656 | sock->state = SS_UNCONNECTED; | |
657 | err = -ECONNREFUSED; | |
658 | goto out_release; | |
659 | } | |
660 | ||
661 | if (sk->sk_state == TCP_ESTABLISHED) { | |
662 | err = -EISCONN; /* No reconnect on a seqpacket socket */ | |
663 | goto out_release; | |
664 | } | |
665 | ||
666 | sk->sk_state = TCP_CLOSE; | |
667 | sock->state = SS_UNCONNECTED; | |
668 | ||
669 | if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) { | |
670 | err = -EINVAL; | |
671 | goto out_release; | |
672 | } | |
673 | if (addr->sax25_family != AF_NETROM) { | |
674 | err = -EINVAL; | |
675 | goto out_release; | |
676 | } | |
677 | if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */ | |
678 | sock_reset_flag(sk, SOCK_ZAPPED); | |
679 | ||
680 | if ((dev = nr_dev_first()) == NULL) { | |
681 | err = -ENETUNREACH; | |
682 | goto out_release; | |
683 | } | |
684 | source = (ax25_address *)dev->dev_addr; | |
685 | ||
686 | user = ax25_findbyuid(current_euid()); | |
687 | if (user) { | |
688 | nr->user_addr = user->call; | |
689 | ax25_uid_put(user); | |
690 | } else { | |
691 | if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) { | |
692 | dev_put(dev); | |
693 | err = -EPERM; | |
694 | goto out_release; | |
695 | } | |
696 | nr->user_addr = *source; | |
697 | } | |
698 | ||
699 | nr->source_addr = *source; | |
700 | nr->device = dev; | |
701 | ||
702 | dev_put(dev); | |
703 | nr_insert_socket(sk); /* Finish the bind */ | |
704 | } | |
705 | ||
706 | nr->dest_addr = addr->sax25_call; | |
707 | ||
708 | release_sock(sk); | |
709 | circuit = nr_find_next_circuit(); | |
710 | lock_sock(sk); | |
711 | ||
712 | nr->my_index = circuit / 256; | |
713 | nr->my_id = circuit % 256; | |
714 | ||
715 | circuit++; | |
716 | ||
717 | /* Move to connecting socket, start sending Connect Requests */ | |
718 | sock->state = SS_CONNECTING; | |
719 | sk->sk_state = TCP_SYN_SENT; | |
720 | ||
721 | nr_establish_data_link(sk); | |
722 | ||
723 | nr->state = NR_STATE_1; | |
724 | ||
725 | nr_start_heartbeat(sk); | |
726 | ||
727 | /* Now the loop */ | |
728 | if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { | |
729 | err = -EINPROGRESS; | |
730 | goto out_release; | |
731 | } | |
732 | ||
733 | /* | |
734 | * A Connect Ack with Choke or timeout or failed routing will go to | |
735 | * closed. | |
736 | */ | |
737 | if (sk->sk_state == TCP_SYN_SENT) { | |
738 | DEFINE_WAIT(wait); | |
739 | ||
740 | for (;;) { | |
741 | prepare_to_wait(sk_sleep(sk), &wait, | |
742 | TASK_INTERRUPTIBLE); | |
743 | if (sk->sk_state != TCP_SYN_SENT) | |
744 | break; | |
745 | if (!signal_pending(current)) { | |
746 | release_sock(sk); | |
747 | schedule(); | |
748 | lock_sock(sk); | |
749 | continue; | |
750 | } | |
751 | err = -ERESTARTSYS; | |
752 | break; | |
753 | } | |
754 | finish_wait(sk_sleep(sk), &wait); | |
755 | if (err) | |
756 | goto out_release; | |
757 | } | |
758 | ||
759 | if (sk->sk_state != TCP_ESTABLISHED) { | |
760 | sock->state = SS_UNCONNECTED; | |
761 | err = sock_error(sk); /* Always set at this point */ | |
762 | goto out_release; | |
763 | } | |
764 | ||
765 | sock->state = SS_CONNECTED; | |
766 | ||
767 | out_release: | |
768 | release_sock(sk); | |
769 | ||
770 | return err; | |
771 | } | |
772 | ||
773 | static int nr_accept(struct socket *sock, struct socket *newsock, int flags) | |
774 | { | |
775 | struct sk_buff *skb; | |
776 | struct sock *newsk; | |
777 | DEFINE_WAIT(wait); | |
778 | struct sock *sk; | |
779 | int err = 0; | |
780 | ||
781 | if ((sk = sock->sk) == NULL) | |
782 | return -EINVAL; | |
783 | ||
784 | lock_sock(sk); | |
785 | if (sk->sk_type != SOCK_SEQPACKET) { | |
786 | err = -EOPNOTSUPP; | |
787 | goto out_release; | |
788 | } | |
789 | ||
790 | if (sk->sk_state != TCP_LISTEN) { | |
791 | err = -EINVAL; | |
792 | goto out_release; | |
793 | } | |
794 | ||
795 | /* | |
796 | * The write queue this time is holding sockets ready to use | |
797 | * hooked into the SABM we saved | |
798 | */ | |
799 | for (;;) { | |
800 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
801 | skb = skb_dequeue(&sk->sk_receive_queue); | |
802 | if (skb) | |
803 | break; | |
804 | ||
805 | if (flags & O_NONBLOCK) { | |
806 | err = -EWOULDBLOCK; | |
807 | break; | |
808 | } | |
809 | if (!signal_pending(current)) { | |
810 | release_sock(sk); | |
811 | schedule(); | |
812 | lock_sock(sk); | |
813 | continue; | |
814 | } | |
815 | err = -ERESTARTSYS; | |
816 | break; | |
817 | } | |
818 | finish_wait(sk_sleep(sk), &wait); | |
819 | if (err) | |
820 | goto out_release; | |
821 | ||
822 | newsk = skb->sk; | |
823 | sock_graft(newsk, newsock); | |
824 | ||
825 | /* Now attach up the new socket */ | |
826 | kfree_skb(skb); | |
827 | sk_acceptq_removed(sk); | |
828 | ||
829 | out_release: | |
830 | release_sock(sk); | |
831 | ||
832 | return err; | |
833 | } | |
834 | ||
835 | static int nr_getname(struct socket *sock, struct sockaddr *uaddr, | |
836 | int *uaddr_len, int peer) | |
837 | { | |
838 | struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr; | |
839 | struct sock *sk = sock->sk; | |
840 | struct nr_sock *nr = nr_sk(sk); | |
841 | ||
842 | lock_sock(sk); | |
843 | if (peer != 0) { | |
844 | if (sk->sk_state != TCP_ESTABLISHED) { | |
845 | release_sock(sk); | |
846 | return -ENOTCONN; | |
847 | } | |
848 | sax->fsa_ax25.sax25_family = AF_NETROM; | |
849 | sax->fsa_ax25.sax25_ndigis = 1; | |
850 | sax->fsa_ax25.sax25_call = nr->user_addr; | |
851 | memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater)); | |
852 | sax->fsa_digipeater[0] = nr->dest_addr; | |
853 | *uaddr_len = sizeof(struct full_sockaddr_ax25); | |
854 | } else { | |
855 | sax->fsa_ax25.sax25_family = AF_NETROM; | |
856 | sax->fsa_ax25.sax25_ndigis = 0; | |
857 | sax->fsa_ax25.sax25_call = nr->source_addr; | |
858 | *uaddr_len = sizeof(struct sockaddr_ax25); | |
859 | } | |
860 | release_sock(sk); | |
861 | ||
862 | return 0; | |
863 | } | |
864 | ||
865 | int nr_rx_frame(struct sk_buff *skb, struct net_device *dev) | |
866 | { | |
867 | struct sock *sk; | |
868 | struct sock *make; | |
869 | struct nr_sock *nr_make; | |
870 | ax25_address *src, *dest, *user; | |
871 | unsigned short circuit_index, circuit_id; | |
872 | unsigned short peer_circuit_index, peer_circuit_id; | |
873 | unsigned short frametype, flags, window, timeout; | |
874 | int ret; | |
875 | ||
876 | skb->sk = NULL; /* Initially we don't know who it's for */ | |
877 | ||
878 | /* | |
879 | * skb->data points to the netrom frame start | |
880 | */ | |
881 | ||
882 | src = (ax25_address *)(skb->data + 0); | |
883 | dest = (ax25_address *)(skb->data + 7); | |
884 | ||
885 | circuit_index = skb->data[15]; | |
886 | circuit_id = skb->data[16]; | |
887 | peer_circuit_index = skb->data[17]; | |
888 | peer_circuit_id = skb->data[18]; | |
889 | frametype = skb->data[19] & 0x0F; | |
890 | flags = skb->data[19] & 0xF0; | |
891 | ||
892 | /* | |
893 | * Check for an incoming IP over NET/ROM frame. | |
894 | */ | |
895 | if (frametype == NR_PROTOEXT && | |
896 | circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) { | |
897 | skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); | |
898 | skb_reset_transport_header(skb); | |
899 | ||
900 | return nr_rx_ip(skb, dev); | |
901 | } | |
902 | ||
903 | /* | |
904 | * Find an existing socket connection, based on circuit ID, if it's | |
905 | * a Connect Request base it on their circuit ID. | |
906 | * | |
907 | * Circuit ID 0/0 is not valid but it could still be a "reset" for a | |
908 | * circuit that no longer exists at the other end ... | |
909 | */ | |
910 | ||
911 | sk = NULL; | |
912 | ||
913 | if (circuit_index == 0 && circuit_id == 0) { | |
914 | if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG) | |
915 | sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src); | |
916 | } else { | |
917 | if (frametype == NR_CONNREQ) | |
918 | sk = nr_find_peer(circuit_index, circuit_id, src); | |
919 | else | |
920 | sk = nr_find_socket(circuit_index, circuit_id); | |
921 | } | |
922 | ||
923 | if (sk != NULL) { | |
924 | skb_reset_transport_header(skb); | |
925 | ||
926 | if (frametype == NR_CONNACK && skb->len == 22) | |
927 | nr_sk(sk)->bpqext = 1; | |
928 | else | |
929 | nr_sk(sk)->bpqext = 0; | |
930 | ||
931 | ret = nr_process_rx_frame(sk, skb); | |
932 | bh_unlock_sock(sk); | |
933 | return ret; | |
934 | } | |
935 | ||
936 | /* | |
937 | * Now it should be a CONNREQ. | |
938 | */ | |
939 | if (frametype != NR_CONNREQ) { | |
940 | /* | |
941 | * Here it would be nice to be able to send a reset but | |
942 | * NET/ROM doesn't have one. We've tried to extend the protocol | |
943 | * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that | |
944 | * apparently kills BPQ boxes... :-( | |
945 | * So now we try to follow the established behaviour of | |
946 | * G8PZT's Xrouter which is sending packets with command type 7 | |
947 | * as an extension of the protocol. | |
948 | */ | |
949 | if (sysctl_netrom_reset_circuit && | |
950 | (frametype != NR_RESET || flags != 0)) | |
951 | nr_transmit_reset(skb, 1); | |
952 | ||
953 | return 0; | |
954 | } | |
955 | ||
956 | sk = nr_find_listener(dest); | |
957 | ||
958 | user = (ax25_address *)(skb->data + 21); | |
959 | ||
960 | if (sk == NULL || sk_acceptq_is_full(sk) || | |
961 | (make = nr_make_new(sk)) == NULL) { | |
962 | nr_transmit_refusal(skb, 0); | |
963 | if (sk) | |
964 | bh_unlock_sock(sk); | |
965 | return 0; | |
966 | } | |
967 | ||
968 | window = skb->data[20]; | |
969 | ||
970 | skb->sk = make; | |
971 | make->sk_state = TCP_ESTABLISHED; | |
972 | ||
973 | /* Fill in his circuit details */ | |
974 | nr_make = nr_sk(make); | |
975 | nr_make->source_addr = *dest; | |
976 | nr_make->dest_addr = *src; | |
977 | nr_make->user_addr = *user; | |
978 | ||
979 | nr_make->your_index = circuit_index; | |
980 | nr_make->your_id = circuit_id; | |
981 | ||
982 | bh_unlock_sock(sk); | |
983 | circuit = nr_find_next_circuit(); | |
984 | bh_lock_sock(sk); | |
985 | ||
986 | nr_make->my_index = circuit / 256; | |
987 | nr_make->my_id = circuit % 256; | |
988 | ||
989 | circuit++; | |
990 | ||
991 | /* Window negotiation */ | |
992 | if (window < nr_make->window) | |
993 | nr_make->window = window; | |
994 | ||
995 | /* L4 timeout negotiation */ | |
996 | if (skb->len == 37) { | |
997 | timeout = skb->data[36] * 256 + skb->data[35]; | |
998 | if (timeout * HZ < nr_make->t1) | |
999 | nr_make->t1 = timeout * HZ; | |
1000 | nr_make->bpqext = 1; | |
1001 | } else { | |
1002 | nr_make->bpqext = 0; | |
1003 | } | |
1004 | ||
1005 | nr_write_internal(make, NR_CONNACK); | |
1006 | ||
1007 | nr_make->condition = 0x00; | |
1008 | nr_make->vs = 0; | |
1009 | nr_make->va = 0; | |
1010 | nr_make->vr = 0; | |
1011 | nr_make->vl = 0; | |
1012 | nr_make->state = NR_STATE_3; | |
1013 | sk_acceptq_added(sk); | |
1014 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1015 | ||
1016 | if (!sock_flag(sk, SOCK_DEAD)) | |
1017 | sk->sk_data_ready(sk, skb->len); | |
1018 | ||
1019 | bh_unlock_sock(sk); | |
1020 | ||
1021 | nr_insert_socket(make); | |
1022 | ||
1023 | nr_start_heartbeat(make); | |
1024 | nr_start_idletimer(make); | |
1025 | ||
1026 | return 1; | |
1027 | } | |
1028 | ||
1029 | static int nr_sendmsg(struct kiocb *iocb, struct socket *sock, | |
1030 | struct msghdr *msg, size_t len) | |
1031 | { | |
1032 | struct sock *sk = sock->sk; | |
1033 | struct nr_sock *nr = nr_sk(sk); | |
1034 | struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name; | |
1035 | int err; | |
1036 | struct sockaddr_ax25 sax; | |
1037 | struct sk_buff *skb; | |
1038 | unsigned char *asmptr; | |
1039 | int size; | |
1040 | ||
1041 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) | |
1042 | return -EINVAL; | |
1043 | ||
1044 | lock_sock(sk); | |
1045 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
1046 | err = -EADDRNOTAVAIL; | |
1047 | goto out; | |
1048 | } | |
1049 | ||
1050 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
1051 | send_sig(SIGPIPE, current, 0); | |
1052 | err = -EPIPE; | |
1053 | goto out; | |
1054 | } | |
1055 | ||
1056 | if (nr->device == NULL) { | |
1057 | err = -ENETUNREACH; | |
1058 | goto out; | |
1059 | } | |
1060 | ||
1061 | if (usax) { | |
1062 | if (msg->msg_namelen < sizeof(sax)) { | |
1063 | err = -EINVAL; | |
1064 | goto out; | |
1065 | } | |
1066 | sax = *usax; | |
1067 | if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) { | |
1068 | err = -EISCONN; | |
1069 | goto out; | |
1070 | } | |
1071 | if (sax.sax25_family != AF_NETROM) { | |
1072 | err = -EINVAL; | |
1073 | goto out; | |
1074 | } | |
1075 | } else { | |
1076 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1077 | err = -ENOTCONN; | |
1078 | goto out; | |
1079 | } | |
1080 | sax.sax25_family = AF_NETROM; | |
1081 | sax.sax25_call = nr->dest_addr; | |
1082 | } | |
1083 | ||
1084 | /* Build a packet - the conventional user limit is 236 bytes. We can | |
1085 | do ludicrously large NetROM frames but must not overflow */ | |
1086 | if (len > 65536) { | |
1087 | err = -EMSGSIZE; | |
1088 | goto out; | |
1089 | } | |
1090 | ||
1091 | size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN; | |
1092 | ||
1093 | if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL) | |
1094 | goto out; | |
1095 | ||
1096 | skb_reserve(skb, size - len); | |
1097 | skb_reset_transport_header(skb); | |
1098 | ||
1099 | /* | |
1100 | * Push down the NET/ROM header | |
1101 | */ | |
1102 | ||
1103 | asmptr = skb_push(skb, NR_TRANSPORT_LEN); | |
1104 | ||
1105 | /* Build a NET/ROM Transport header */ | |
1106 | ||
1107 | *asmptr++ = nr->your_index; | |
1108 | *asmptr++ = nr->your_id; | |
1109 | *asmptr++ = 0; /* To be filled in later */ | |
1110 | *asmptr++ = 0; /* Ditto */ | |
1111 | *asmptr++ = NR_INFO; | |
1112 | ||
1113 | /* | |
1114 | * Put the data on the end | |
1115 | */ | |
1116 | skb_put(skb, len); | |
1117 | ||
1118 | /* User data follows immediately after the NET/ROM transport header */ | |
1119 | if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) { | |
1120 | kfree_skb(skb); | |
1121 | err = -EFAULT; | |
1122 | goto out; | |
1123 | } | |
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 | ||
1165 | skb_reset_transport_header(skb); | |
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; | |
1177 | skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call, | |
1178 | AX25_ADDR_LEN); | |
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 | ||
1196 | switch (cmd) { | |
1197 | case TIOCOUTQ: { | |
1198 | long amount; | |
1199 | ||
1200 | lock_sock(sk); | |
1201 | amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); | |
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; | |
1211 | ||
1212 | lock_sock(sk); | |
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: | |
1221 | lock_sock(sk); | |
1222 | ret = sock_get_timestamp(sk, argp); | |
1223 | release_sock(sk); | |
1224 | return ret; | |
1225 | ||
1226 | case SIOCGSTAMPNS: | |
1227 | lock_sock(sk); | |
1228 | ret = sock_get_timestampns(sk, argp); | |
1229 | release_sock(sk); | |
1230 | return ret; | |
1231 | ||
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: | |
1242 | return -EINVAL; | |
1243 | ||
1244 | case SIOCADDRT: | |
1245 | case SIOCDELRT: | |
1246 | case SIOCNRDECOBS: | |
1247 | if (!capable(CAP_NET_ADMIN)) return -EPERM; | |
1248 | return nr_rt_ioctl(cmd, argp); | |
1249 | ||
1250 | default: | |
1251 | return -ENOIOCTLCMD; | |
1252 | } | |
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 | spin_lock_bh(&nr_list_lock); | |
1262 | return seq_hlist_start_head(&nr_list, *pos); | |
1263 | } | |
1264 | ||
1265 | static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos) | |
1266 | { | |
1267 | return seq_hlist_next(v, &nr_list, pos); | |
1268 | } | |
1269 | ||
1270 | static void nr_info_stop(struct seq_file *seq, void *v) | |
1271 | { | |
1272 | spin_unlock_bh(&nr_list_lock); | |
1273 | } | |
1274 | ||
1275 | static int nr_info_show(struct seq_file *seq, void *v) | |
1276 | { | |
1277 | struct sock *s = sk_entry(v); | |
1278 | struct net_device *dev; | |
1279 | struct nr_sock *nr; | |
1280 | const char *devname; | |
1281 | char buf[11]; | |
1282 | ||
1283 | if (v == SEQ_START_TOKEN) | |
1284 | seq_puts(seq, | |
1285 | "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"); | |
1286 | ||
1287 | else { | |
1288 | ||
1289 | bh_lock_sock(s); | |
1290 | nr = nr_sk(s); | |
1291 | ||
1292 | if ((dev = nr->device) == NULL) | |
1293 | devname = "???"; | |
1294 | else | |
1295 | devname = dev->name; | |
1296 | ||
1297 | seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr)); | |
1298 | seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr)); | |
1299 | seq_printf(seq, | |
1300 | "%-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", | |
1301 | ax2asc(buf, &nr->source_addr), | |
1302 | devname, | |
1303 | nr->my_index, | |
1304 | nr->my_id, | |
1305 | nr->your_index, | |
1306 | nr->your_id, | |
1307 | nr->state, | |
1308 | nr->vs, | |
1309 | nr->vr, | |
1310 | nr->va, | |
1311 | ax25_display_timer(&nr->t1timer) / HZ, | |
1312 | nr->t1 / HZ, | |
1313 | ax25_display_timer(&nr->t2timer) / HZ, | |
1314 | nr->t2 / HZ, | |
1315 | ax25_display_timer(&nr->t4timer) / HZ, | |
1316 | nr->t4 / HZ, | |
1317 | ax25_display_timer(&nr->idletimer) / (60 * HZ), | |
1318 | nr->idle / (60 * HZ), | |
1319 | nr->n2count, | |
1320 | nr->n2, | |
1321 | nr->window, | |
1322 | sk_wmem_alloc_get(s), | |
1323 | sk_rmem_alloc_get(s), | |
1324 | s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); | |
1325 | ||
1326 | bh_unlock_sock(s); | |
1327 | } | |
1328 | return 0; | |
1329 | } | |
1330 | ||
1331 | static const struct seq_operations nr_info_seqops = { | |
1332 | .start = nr_info_start, | |
1333 | .next = nr_info_next, | |
1334 | .stop = nr_info_stop, | |
1335 | .show = nr_info_show, | |
1336 | }; | |
1337 | ||
1338 | static int nr_info_open(struct inode *inode, struct file *file) | |
1339 | { | |
1340 | return seq_open(file, &nr_info_seqops); | |
1341 | } | |
1342 | ||
1343 | static const struct file_operations nr_info_fops = { | |
1344 | .owner = THIS_MODULE, | |
1345 | .open = nr_info_open, | |
1346 | .read = seq_read, | |
1347 | .llseek = seq_lseek, | |
1348 | .release = seq_release, | |
1349 | }; | |
1350 | #endif /* CONFIG_PROC_FS */ | |
1351 | ||
1352 | static const struct net_proto_family nr_family_ops = { | |
1353 | .family = PF_NETROM, | |
1354 | .create = nr_create, | |
1355 | .owner = THIS_MODULE, | |
1356 | }; | |
1357 | ||
1358 | static const struct proto_ops nr_proto_ops = { | |
1359 | .family = PF_NETROM, | |
1360 | .owner = THIS_MODULE, | |
1361 | .release = nr_release, | |
1362 | .bind = nr_bind, | |
1363 | .connect = nr_connect, | |
1364 | .socketpair = sock_no_socketpair, | |
1365 | .accept = nr_accept, | |
1366 | .getname = nr_getname, | |
1367 | .poll = datagram_poll, | |
1368 | .ioctl = nr_ioctl, | |
1369 | .listen = nr_listen, | |
1370 | .shutdown = sock_no_shutdown, | |
1371 | .setsockopt = nr_setsockopt, | |
1372 | .getsockopt = nr_getsockopt, | |
1373 | .sendmsg = nr_sendmsg, | |
1374 | .recvmsg = nr_recvmsg, | |
1375 | .mmap = sock_no_mmap, | |
1376 | .sendpage = sock_no_sendpage, | |
1377 | }; | |
1378 | ||
1379 | static struct notifier_block nr_dev_notifier = { | |
1380 | .notifier_call = nr_device_event, | |
1381 | }; | |
1382 | ||
1383 | static struct net_device **dev_nr; | |
1384 | ||
1385 | static struct ax25_protocol nr_pid = { | |
1386 | .pid = AX25_P_NETROM, | |
1387 | .func = nr_route_frame | |
1388 | }; | |
1389 | ||
1390 | static struct ax25_linkfail nr_linkfail_notifier = { | |
1391 | .func = nr_link_failed, | |
1392 | }; | |
1393 | ||
1394 | static int __init nr_proto_init(void) | |
1395 | { | |
1396 | int i; | |
1397 | int rc = proto_register(&nr_proto, 0); | |
1398 | ||
1399 | if (rc != 0) | |
1400 | goto out; | |
1401 | ||
1402 | if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) { | |
1403 | printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n"); | |
1404 | return -1; | |
1405 | } | |
1406 | ||
1407 | dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL); | |
1408 | if (dev_nr == NULL) { | |
1409 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n"); | |
1410 | return -1; | |
1411 | } | |
1412 | ||
1413 | for (i = 0; i < nr_ndevs; i++) { | |
1414 | char name[IFNAMSIZ]; | |
1415 | struct net_device *dev; | |
1416 | ||
1417 | sprintf(name, "nr%d", i); | |
1418 | dev = alloc_netdev(0, name, nr_setup); | |
1419 | if (!dev) { | |
1420 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n"); | |
1421 | goto fail; | |
1422 | } | |
1423 | ||
1424 | dev->base_addr = i; | |
1425 | if (register_netdev(dev)) { | |
1426 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n"); | |
1427 | free_netdev(dev); | |
1428 | goto fail; | |
1429 | } | |
1430 | nr_set_lockdep_key(dev); | |
1431 | dev_nr[i] = dev; | |
1432 | } | |
1433 | ||
1434 | if (sock_register(&nr_family_ops)) { | |
1435 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n"); | |
1436 | goto fail; | |
1437 | } | |
1438 | ||
1439 | register_netdevice_notifier(&nr_dev_notifier); | |
1440 | ||
1441 | ax25_register_pid(&nr_pid); | |
1442 | ax25_linkfail_register(&nr_linkfail_notifier); | |
1443 | ||
1444 | #ifdef CONFIG_SYSCTL | |
1445 | nr_register_sysctl(); | |
1446 | #endif | |
1447 | ||
1448 | nr_loopback_init(); | |
1449 | ||
1450 | proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops); | |
1451 | proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops); | |
1452 | proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops); | |
1453 | out: | |
1454 | return rc; | |
1455 | fail: | |
1456 | while (--i >= 0) { | |
1457 | unregister_netdev(dev_nr[i]); | |
1458 | free_netdev(dev_nr[i]); | |
1459 | } | |
1460 | kfree(dev_nr); | |
1461 | proto_unregister(&nr_proto); | |
1462 | rc = -1; | |
1463 | goto out; | |
1464 | } | |
1465 | ||
1466 | module_init(nr_proto_init); | |
1467 | ||
1468 | module_param(nr_ndevs, int, 0); | |
1469 | MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices"); | |
1470 | ||
1471 | MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); | |
1472 | MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol"); | |
1473 | MODULE_LICENSE("GPL"); | |
1474 | MODULE_ALIAS_NETPROTO(PF_NETROM); | |
1475 | ||
1476 | static void __exit nr_exit(void) | |
1477 | { | |
1478 | int i; | |
1479 | ||
1480 | proc_net_remove(&init_net, "nr"); | |
1481 | proc_net_remove(&init_net, "nr_neigh"); | |
1482 | proc_net_remove(&init_net, "nr_nodes"); | |
1483 | nr_loopback_clear(); | |
1484 | ||
1485 | nr_rt_free(); | |
1486 | ||
1487 | #ifdef CONFIG_SYSCTL | |
1488 | nr_unregister_sysctl(); | |
1489 | #endif | |
1490 | ||
1491 | ax25_linkfail_release(&nr_linkfail_notifier); | |
1492 | ax25_protocol_release(AX25_P_NETROM); | |
1493 | ||
1494 | unregister_netdevice_notifier(&nr_dev_notifier); | |
1495 | ||
1496 | sock_unregister(PF_NETROM); | |
1497 | ||
1498 | for (i = 0; i < nr_ndevs; i++) { | |
1499 | struct net_device *dev = dev_nr[i]; | |
1500 | if (dev) { | |
1501 | unregister_netdev(dev); | |
1502 | free_netdev(dev); | |
1503 | } | |
1504 | } | |
1505 | ||
1506 | kfree(dev_nr); | |
1507 | proto_unregister(&nr_proto); | |
1508 | } | |
1509 | module_exit(nr_exit); |