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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License as published by | |
4 | * the Free Software Foundation; either version 2 of the License, or | |
5 | * (at your option) any later version. | |
6 | * | |
7 | * Copyright 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 | ||
1da177e4 LT |
77 | /* |
78 | * Socket removal during an interrupt is now safe. | |
79 | */ | |
80 | static void nr_remove_socket(struct sock *sk) | |
81 | { | |
82 | spin_lock_bh(&nr_list_lock); | |
83 | sk_del_node_init(sk); | |
84 | spin_unlock_bh(&nr_list_lock); | |
85 | } | |
86 | ||
87 | /* | |
88 | * Kill all bound sockets on a dropped device. | |
89 | */ | |
90 | static void nr_kill_by_device(struct net_device *dev) | |
91 | { | |
92 | struct sock *s; | |
93 | struct hlist_node *node; | |
94 | ||
95 | spin_lock_bh(&nr_list_lock); | |
96 | sk_for_each(s, node, &nr_list) | |
97 | if (nr_sk(s)->device == dev) | |
98 | nr_disconnect(s, ENETUNREACH); | |
99 | spin_unlock_bh(&nr_list_lock); | |
100 | } | |
101 | ||
102 | /* | |
103 | * Handle device status changes. | |
104 | */ | |
105 | static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
106 | { | |
107 | struct net_device *dev = (struct net_device *)ptr; | |
108 | ||
c346dca1 | 109 | if (dev_net(dev) != &init_net) |
e9dc8653 EB |
110 | return NOTIFY_DONE; |
111 | ||
1da177e4 LT |
112 | if (event != NETDEV_DOWN) |
113 | return NOTIFY_DONE; | |
114 | ||
115 | nr_kill_by_device(dev); | |
116 | nr_rt_device_down(dev); | |
5f8f59d6 | 117 | |
1da177e4 LT |
118 | return NOTIFY_DONE; |
119 | } | |
120 | ||
121 | /* | |
122 | * Add a socket to the bound sockets list. | |
123 | */ | |
124 | static void nr_insert_socket(struct sock *sk) | |
125 | { | |
126 | spin_lock_bh(&nr_list_lock); | |
127 | sk_add_node(sk, &nr_list); | |
128 | spin_unlock_bh(&nr_list_lock); | |
129 | } | |
130 | ||
131 | /* | |
132 | * Find a socket that wants to accept the Connect Request we just | |
133 | * received. | |
134 | */ | |
135 | static struct sock *nr_find_listener(ax25_address *addr) | |
136 | { | |
137 | struct sock *s; | |
138 | struct hlist_node *node; | |
139 | ||
140 | spin_lock_bh(&nr_list_lock); | |
141 | sk_for_each(s, node, &nr_list) | |
142 | if (!ax25cmp(&nr_sk(s)->source_addr, addr) && | |
143 | s->sk_state == TCP_LISTEN) { | |
5f8f59d6 | 144 | bh_lock_sock(s); |
1da177e4 LT |
145 | goto found; |
146 | } | |
147 | s = NULL; | |
148 | found: | |
149 | spin_unlock_bh(&nr_list_lock); | |
150 | return s; | |
151 | } | |
152 | ||
153 | /* | |
154 | * Find a connected NET/ROM socket given my circuit IDs. | |
155 | */ | |
156 | static struct sock *nr_find_socket(unsigned char index, unsigned char id) | |
157 | { | |
158 | struct sock *s; | |
159 | struct hlist_node *node; | |
160 | ||
161 | spin_lock_bh(&nr_list_lock); | |
162 | sk_for_each(s, node, &nr_list) { | |
163 | struct nr_sock *nr = nr_sk(s); | |
5f8f59d6 | 164 | |
1da177e4 LT |
165 | if (nr->my_index == index && nr->my_id == id) { |
166 | bh_lock_sock(s); | |
167 | goto found; | |
168 | } | |
169 | } | |
170 | s = NULL; | |
171 | found: | |
172 | spin_unlock_bh(&nr_list_lock); | |
173 | return s; | |
174 | } | |
175 | ||
176 | /* | |
177 | * Find a connected NET/ROM socket given their circuit IDs. | |
178 | */ | |
179 | static struct sock *nr_find_peer(unsigned char index, unsigned char id, | |
180 | ax25_address *dest) | |
181 | { | |
182 | struct sock *s; | |
183 | struct hlist_node *node; | |
184 | ||
185 | spin_lock_bh(&nr_list_lock); | |
186 | sk_for_each(s, node, &nr_list) { | |
187 | struct nr_sock *nr = nr_sk(s); | |
5f8f59d6 | 188 | |
1da177e4 LT |
189 | if (nr->your_index == index && nr->your_id == id && |
190 | !ax25cmp(&nr->dest_addr, dest)) { | |
5f8f59d6 | 191 | bh_lock_sock(s); |
1da177e4 LT |
192 | goto found; |
193 | } | |
194 | } | |
195 | s = NULL; | |
196 | found: | |
197 | spin_unlock_bh(&nr_list_lock); | |
198 | return s; | |
199 | } | |
200 | ||
201 | /* | |
202 | * Find next free circuit ID. | |
203 | */ | |
204 | static unsigned short nr_find_next_circuit(void) | |
205 | { | |
206 | unsigned short id = circuit; | |
207 | unsigned char i, j; | |
208 | struct sock *sk; | |
209 | ||
210 | for (;;) { | |
211 | i = id / 256; | |
212 | j = id % 256; | |
213 | ||
214 | if (i != 0 && j != 0) { | |
215 | if ((sk=nr_find_socket(i, j)) == NULL) | |
216 | break; | |
217 | bh_unlock_sock(sk); | |
218 | } | |
219 | ||
220 | id++; | |
221 | } | |
222 | ||
223 | return id; | |
224 | } | |
225 | ||
226 | /* | |
227 | * Deferred destroy. | |
228 | */ | |
229 | void nr_destroy_socket(struct sock *); | |
230 | ||
231 | /* | |
232 | * Handler for deferred kills. | |
233 | */ | |
234 | static void nr_destroy_timer(unsigned long data) | |
235 | { | |
236 | struct sock *sk=(struct sock *)data; | |
237 | bh_lock_sock(sk); | |
238 | sock_hold(sk); | |
239 | nr_destroy_socket(sk); | |
240 | bh_unlock_sock(sk); | |
241 | sock_put(sk); | |
242 | } | |
243 | ||
244 | /* | |
245 | * This is called from user mode and the timers. Thus it protects itself | |
246 | * against interrupt users but doesn't worry about being called during | |
247 | * work. Once it is removed from the queue no interrupt or bottom half | |
248 | * will touch it and we are (fairly 8-) ) safe. | |
249 | */ | |
250 | void nr_destroy_socket(struct sock *sk) | |
251 | { | |
252 | struct sk_buff *skb; | |
253 | ||
254 | nr_remove_socket(sk); | |
255 | ||
256 | nr_stop_heartbeat(sk); | |
257 | nr_stop_t1timer(sk); | |
258 | nr_stop_t2timer(sk); | |
259 | nr_stop_t4timer(sk); | |
260 | nr_stop_idletimer(sk); | |
261 | ||
262 | nr_clear_queues(sk); /* Flush the queues */ | |
263 | ||
264 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
265 | if (skb->sk != sk) { /* A pending connection */ | |
266 | /* Queue the unaccepted socket for death */ | |
267 | sock_set_flag(skb->sk, SOCK_DEAD); | |
268 | nr_start_heartbeat(skb->sk); | |
269 | nr_sk(skb->sk)->state = NR_STATE_0; | |
270 | } | |
271 | ||
272 | kfree_skb(skb); | |
273 | } | |
274 | ||
275 | if (atomic_read(&sk->sk_wmem_alloc) || | |
276 | atomic_read(&sk->sk_rmem_alloc)) { | |
277 | /* Defer: outstanding buffers */ | |
278 | sk->sk_timer.function = nr_destroy_timer; | |
279 | sk->sk_timer.expires = jiffies + 2 * HZ; | |
280 | add_timer(&sk->sk_timer); | |
281 | } else | |
282 | sock_put(sk); | |
283 | } | |
284 | ||
285 | /* | |
286 | * Handling for system calls applied via the various interfaces to a | |
287 | * NET/ROM socket object. | |
288 | */ | |
289 | ||
290 | static int nr_setsockopt(struct socket *sock, int level, int optname, | |
291 | char __user *optval, int optlen) | |
292 | { | |
293 | struct sock *sk = sock->sk; | |
294 | struct nr_sock *nr = nr_sk(sk); | |
295 | int opt; | |
296 | ||
297 | if (level != SOL_NETROM) | |
298 | return -ENOPROTOOPT; | |
299 | ||
300 | if (optlen < sizeof(int)) | |
301 | return -EINVAL; | |
302 | ||
303 | if (get_user(opt, (int __user *)optval)) | |
304 | return -EFAULT; | |
305 | ||
306 | switch (optname) { | |
307 | case NETROM_T1: | |
308 | if (opt < 1) | |
309 | return -EINVAL; | |
310 | nr->t1 = opt * HZ; | |
311 | return 0; | |
312 | ||
313 | case NETROM_T2: | |
314 | if (opt < 1) | |
315 | return -EINVAL; | |
316 | nr->t2 = opt * HZ; | |
317 | return 0; | |
318 | ||
319 | case NETROM_N2: | |
320 | if (opt < 1 || opt > 31) | |
321 | return -EINVAL; | |
322 | nr->n2 = opt; | |
323 | return 0; | |
324 | ||
325 | case NETROM_T4: | |
326 | if (opt < 1) | |
327 | return -EINVAL; | |
328 | nr->t4 = opt * HZ; | |
329 | return 0; | |
330 | ||
331 | case NETROM_IDLE: | |
332 | if (opt < 0) | |
333 | return -EINVAL; | |
334 | nr->idle = opt * 60 * HZ; | |
335 | return 0; | |
336 | ||
337 | default: | |
338 | return -ENOPROTOOPT; | |
339 | } | |
340 | } | |
341 | ||
342 | static int nr_getsockopt(struct socket *sock, int level, int optname, | |
343 | char __user *optval, int __user *optlen) | |
344 | { | |
345 | struct sock *sk = sock->sk; | |
346 | struct nr_sock *nr = nr_sk(sk); | |
347 | int val = 0; | |
5f8f59d6 | 348 | int len; |
1da177e4 LT |
349 | |
350 | if (level != SOL_NETROM) | |
351 | return -ENOPROTOOPT; | |
5f8f59d6 | 352 | |
1da177e4 LT |
353 | if (get_user(len, optlen)) |
354 | return -EFAULT; | |
355 | ||
356 | if (len < 0) | |
357 | return -EINVAL; | |
5f8f59d6 | 358 | |
1da177e4 LT |
359 | switch (optname) { |
360 | case NETROM_T1: | |
361 | val = nr->t1 / HZ; | |
362 | break; | |
363 | ||
364 | case NETROM_T2: | |
365 | val = nr->t2 / HZ; | |
366 | break; | |
367 | ||
368 | case NETROM_N2: | |
369 | val = nr->n2; | |
370 | break; | |
371 | ||
372 | case NETROM_T4: | |
373 | val = nr->t4 / HZ; | |
374 | break; | |
375 | ||
376 | case NETROM_IDLE: | |
377 | val = nr->idle / (60 * HZ); | |
378 | break; | |
379 | ||
380 | default: | |
381 | return -ENOPROTOOPT; | |
382 | } | |
383 | ||
384 | len = min_t(unsigned int, len, sizeof(int)); | |
385 | ||
386 | if (put_user(len, optlen)) | |
387 | return -EFAULT; | |
388 | ||
389 | return copy_to_user(optval, &val, len) ? -EFAULT : 0; | |
390 | } | |
391 | ||
392 | static int nr_listen(struct socket *sock, int backlog) | |
393 | { | |
394 | struct sock *sk = sock->sk; | |
395 | ||
396 | lock_sock(sk); | |
397 | if (sk->sk_state != TCP_LISTEN) { | |
398 | memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN); | |
399 | sk->sk_max_ack_backlog = backlog; | |
400 | sk->sk_state = TCP_LISTEN; | |
401 | release_sock(sk); | |
402 | return 0; | |
403 | } | |
404 | release_sock(sk); | |
405 | ||
406 | return -EOPNOTSUPP; | |
407 | } | |
408 | ||
409 | static struct proto nr_proto = { | |
410 | .name = "NETROM", | |
411 | .owner = THIS_MODULE, | |
412 | .obj_size = sizeof(struct nr_sock), | |
413 | }; | |
414 | ||
1b8d7ae4 | 415 | static int nr_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
416 | { |
417 | struct sock *sk; | |
418 | struct nr_sock *nr; | |
419 | ||
1b8d7ae4 EB |
420 | if (net != &init_net) |
421 | return -EAFNOSUPPORT; | |
422 | ||
1da177e4 LT |
423 | if (sock->type != SOCK_SEQPACKET || protocol != 0) |
424 | return -ESOCKTNOSUPPORT; | |
425 | ||
6257ff21 PE |
426 | sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto); |
427 | if (sk == NULL) | |
1da177e4 LT |
428 | return -ENOMEM; |
429 | ||
430 | nr = nr_sk(sk); | |
431 | ||
432 | sock_init_data(sock, sk); | |
433 | ||
434 | sock->ops = &nr_proto_ops; | |
435 | sk->sk_protocol = protocol; | |
436 | ||
437 | skb_queue_head_init(&nr->ack_queue); | |
438 | skb_queue_head_init(&nr->reseq_queue); | |
439 | skb_queue_head_init(&nr->frag_queue); | |
440 | ||
441 | nr_init_timers(sk); | |
442 | ||
4d8937d0 RB |
443 | nr->t1 = |
444 | msecs_to_jiffies(sysctl_netrom_transport_timeout); | |
445 | nr->t2 = | |
446 | msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay); | |
447 | nr->n2 = | |
448 | msecs_to_jiffies(sysctl_netrom_transport_maximum_tries); | |
449 | nr->t4 = | |
450 | msecs_to_jiffies(sysctl_netrom_transport_busy_delay); | |
451 | nr->idle = | |
452 | msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout); | |
1da177e4 LT |
453 | nr->window = sysctl_netrom_transport_requested_window_size; |
454 | ||
455 | nr->bpqext = 1; | |
456 | nr->state = NR_STATE_0; | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
461 | static struct sock *nr_make_new(struct sock *osk) | |
462 | { | |
463 | struct sock *sk; | |
464 | struct nr_sock *nr, *onr; | |
465 | ||
466 | if (osk->sk_type != SOCK_SEQPACKET) | |
467 | return NULL; | |
468 | ||
3b1e0a65 | 469 | sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot); |
6257ff21 | 470 | if (sk == NULL) |
1da177e4 LT |
471 | return NULL; |
472 | ||
473 | nr = nr_sk(sk); | |
474 | ||
475 | sock_init_data(NULL, sk); | |
476 | ||
477 | sk->sk_type = osk->sk_type; | |
1da177e4 LT |
478 | sk->sk_priority = osk->sk_priority; |
479 | sk->sk_protocol = osk->sk_protocol; | |
480 | sk->sk_rcvbuf = osk->sk_rcvbuf; | |
481 | sk->sk_sndbuf = osk->sk_sndbuf; | |
482 | sk->sk_state = TCP_ESTABLISHED; | |
53b924b3 | 483 | sock_copy_flags(sk, osk); |
1da177e4 LT |
484 | |
485 | skb_queue_head_init(&nr->ack_queue); | |
486 | skb_queue_head_init(&nr->reseq_queue); | |
487 | skb_queue_head_init(&nr->frag_queue); | |
488 | ||
489 | nr_init_timers(sk); | |
490 | ||
491 | onr = nr_sk(osk); | |
492 | ||
493 | nr->t1 = onr->t1; | |
494 | nr->t2 = onr->t2; | |
495 | nr->n2 = onr->n2; | |
496 | nr->t4 = onr->t4; | |
497 | nr->idle = onr->idle; | |
498 | nr->window = onr->window; | |
499 | ||
500 | nr->device = onr->device; | |
501 | nr->bpqext = onr->bpqext; | |
502 | ||
503 | return sk; | |
504 | } | |
505 | ||
506 | static int nr_release(struct socket *sock) | |
507 | { | |
508 | struct sock *sk = sock->sk; | |
509 | struct nr_sock *nr; | |
510 | ||
511 | if (sk == NULL) return 0; | |
512 | ||
513 | sock_hold(sk); | |
514 | lock_sock(sk); | |
515 | nr = nr_sk(sk); | |
516 | ||
517 | switch (nr->state) { | |
518 | case NR_STATE_0: | |
519 | case NR_STATE_1: | |
520 | case NR_STATE_2: | |
521 | nr_disconnect(sk, 0); | |
522 | nr_destroy_socket(sk); | |
523 | break; | |
524 | ||
525 | case NR_STATE_3: | |
526 | nr_clear_queues(sk); | |
527 | nr->n2count = 0; | |
528 | nr_write_internal(sk, NR_DISCREQ); | |
529 | nr_start_t1timer(sk); | |
530 | nr_stop_t2timer(sk); | |
531 | nr_stop_t4timer(sk); | |
532 | nr_stop_idletimer(sk); | |
533 | nr->state = NR_STATE_2; | |
534 | sk->sk_state = TCP_CLOSE; | |
535 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
536 | sk->sk_state_change(sk); | |
537 | sock_orphan(sk); | |
538 | sock_set_flag(sk, SOCK_DESTROY); | |
1da177e4 LT |
539 | break; |
540 | ||
541 | default: | |
1da177e4 LT |
542 | break; |
543 | } | |
544 | ||
5f8f59d6 | 545 | sock->sk = NULL; |
1da177e4 LT |
546 | release_sock(sk); |
547 | sock_put(sk); | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
553 | { | |
554 | struct sock *sk = sock->sk; | |
555 | struct nr_sock *nr = nr_sk(sk); | |
556 | struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; | |
557 | struct net_device *dev; | |
01d7dd0e RB |
558 | ax25_uid_assoc *user; |
559 | ax25_address *source; | |
1da177e4 LT |
560 | |
561 | lock_sock(sk); | |
562 | if (!sock_flag(sk, SOCK_ZAPPED)) { | |
563 | release_sock(sk); | |
564 | return -EINVAL; | |
565 | } | |
566 | if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) { | |
567 | release_sock(sk); | |
568 | return -EINVAL; | |
569 | } | |
570 | if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) { | |
571 | release_sock(sk); | |
572 | return -EINVAL; | |
573 | } | |
574 | if (addr->fsa_ax25.sax25_family != AF_NETROM) { | |
575 | release_sock(sk); | |
576 | return -EINVAL; | |
577 | } | |
578 | if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) { | |
579 | SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n"); | |
580 | release_sock(sk); | |
581 | return -EADDRNOTAVAIL; | |
582 | } | |
583 | ||
584 | /* | |
585 | * Only the super user can set an arbitrary user callsign. | |
586 | */ | |
587 | if (addr->fsa_ax25.sax25_ndigis == 1) { | |
588 | if (!capable(CAP_NET_BIND_SERVICE)) { | |
589 | dev_put(dev); | |
590 | release_sock(sk); | |
591 | return -EACCES; | |
592 | } | |
593 | nr->user_addr = addr->fsa_digipeater[0]; | |
594 | nr->source_addr = addr->fsa_ax25.sax25_call; | |
595 | } else { | |
596 | source = &addr->fsa_ax25.sax25_call; | |
597 | ||
01d7dd0e RB |
598 | user = ax25_findbyuid(current->euid); |
599 | if (user) { | |
600 | nr->user_addr = user->call; | |
601 | ax25_uid_put(user); | |
602 | } else { | |
1da177e4 LT |
603 | if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { |
604 | release_sock(sk); | |
605 | dev_put(dev); | |
606 | return -EPERM; | |
607 | } | |
01d7dd0e | 608 | nr->user_addr = *source; |
1da177e4 LT |
609 | } |
610 | ||
1da177e4 LT |
611 | nr->source_addr = *source; |
612 | } | |
613 | ||
614 | nr->device = dev; | |
615 | nr_insert_socket(sk); | |
616 | ||
617 | sock_reset_flag(sk, SOCK_ZAPPED); | |
618 | dev_put(dev); | |
619 | release_sock(sk); | |
620 | SOCK_DEBUG(sk, "NET/ROM: socket is bound\n"); | |
621 | return 0; | |
622 | } | |
623 | ||
624 | static int nr_connect(struct socket *sock, struct sockaddr *uaddr, | |
625 | int addr_len, int flags) | |
626 | { | |
627 | struct sock *sk = sock->sk; | |
628 | struct nr_sock *nr = nr_sk(sk); | |
629 | struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr; | |
01d7dd0e RB |
630 | ax25_address *source = NULL; |
631 | ax25_uid_assoc *user; | |
1da177e4 | 632 | struct net_device *dev; |
75606dc6 | 633 | int err = 0; |
1da177e4 LT |
634 | |
635 | lock_sock(sk); | |
636 | if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { | |
637 | sock->state = SS_CONNECTED; | |
75606dc6 | 638 | goto out_release; /* Connect completed during a ERESTARTSYS event */ |
1da177e4 LT |
639 | } |
640 | ||
641 | if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { | |
642 | sock->state = SS_UNCONNECTED; | |
75606dc6 RB |
643 | err = -ECONNREFUSED; |
644 | goto out_release; | |
1da177e4 LT |
645 | } |
646 | ||
647 | if (sk->sk_state == TCP_ESTABLISHED) { | |
75606dc6 RB |
648 | err = -EISCONN; /* No reconnect on a seqpacket socket */ |
649 | goto out_release; | |
1da177e4 LT |
650 | } |
651 | ||
5f8f59d6 | 652 | sk->sk_state = TCP_CLOSE; |
1da177e4 LT |
653 | sock->state = SS_UNCONNECTED; |
654 | ||
655 | if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) { | |
75606dc6 RB |
656 | err = -EINVAL; |
657 | goto out_release; | |
1da177e4 LT |
658 | } |
659 | if (addr->sax25_family != AF_NETROM) { | |
75606dc6 RB |
660 | err = -EINVAL; |
661 | goto out_release; | |
1da177e4 LT |
662 | } |
663 | if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */ | |
664 | sock_reset_flag(sk, SOCK_ZAPPED); | |
665 | ||
666 | if ((dev = nr_dev_first()) == NULL) { | |
75606dc6 RB |
667 | err = -ENETUNREACH; |
668 | goto out_release; | |
1da177e4 LT |
669 | } |
670 | source = (ax25_address *)dev->dev_addr; | |
671 | ||
01d7dd0e RB |
672 | user = ax25_findbyuid(current->euid); |
673 | if (user) { | |
674 | nr->user_addr = user->call; | |
675 | ax25_uid_put(user); | |
676 | } else { | |
1da177e4 LT |
677 | if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) { |
678 | dev_put(dev); | |
75606dc6 RB |
679 | err = -EPERM; |
680 | goto out_release; | |
1da177e4 | 681 | } |
01d7dd0e | 682 | nr->user_addr = *source; |
1da177e4 LT |
683 | } |
684 | ||
1da177e4 LT |
685 | nr->source_addr = *source; |
686 | nr->device = dev; | |
687 | ||
688 | dev_put(dev); | |
689 | nr_insert_socket(sk); /* Finish the bind */ | |
690 | } | |
691 | ||
692 | nr->dest_addr = addr->sax25_call; | |
693 | ||
694 | release_sock(sk); | |
695 | circuit = nr_find_next_circuit(); | |
696 | lock_sock(sk); | |
697 | ||
698 | nr->my_index = circuit / 256; | |
699 | nr->my_id = circuit % 256; | |
700 | ||
701 | circuit++; | |
702 | ||
703 | /* Move to connecting socket, start sending Connect Requests */ | |
704 | sock->state = SS_CONNECTING; | |
705 | sk->sk_state = TCP_SYN_SENT; | |
706 | ||
707 | nr_establish_data_link(sk); | |
708 | ||
709 | nr->state = NR_STATE_1; | |
710 | ||
711 | nr_start_heartbeat(sk); | |
712 | ||
713 | /* Now the loop */ | |
714 | if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { | |
75606dc6 RB |
715 | err = -EINPROGRESS; |
716 | goto out_release; | |
1da177e4 | 717 | } |
5f8f59d6 | 718 | |
1da177e4 LT |
719 | /* |
720 | * A Connect Ack with Choke or timeout or failed routing will go to | |
721 | * closed. | |
722 | */ | |
723 | if (sk->sk_state == TCP_SYN_SENT) { | |
75606dc6 | 724 | DEFINE_WAIT(wait); |
1da177e4 | 725 | |
1da177e4 | 726 | for (;;) { |
75606dc6 | 727 | prepare_to_wait(sk->sk_sleep, &wait, |
639fc4c3 | 728 | TASK_INTERRUPTIBLE); |
1da177e4 LT |
729 | if (sk->sk_state != TCP_SYN_SENT) |
730 | break; | |
75606dc6 RB |
731 | if (!signal_pending(current)) { |
732 | release_sock(sk); | |
1da177e4 LT |
733 | schedule(); |
734 | lock_sock(sk); | |
735 | continue; | |
736 | } | |
75606dc6 RB |
737 | err = -ERESTARTSYS; |
738 | break; | |
1da177e4 | 739 | } |
75606dc6 RB |
740 | finish_wait(sk->sk_sleep, &wait); |
741 | if (err) | |
742 | goto out_release; | |
1da177e4 LT |
743 | } |
744 | ||
745 | if (sk->sk_state != TCP_ESTABLISHED) { | |
746 | sock->state = SS_UNCONNECTED; | |
75606dc6 RB |
747 | err = sock_error(sk); /* Always set at this point */ |
748 | goto out_release; | |
1da177e4 LT |
749 | } |
750 | ||
751 | sock->state = SS_CONNECTED; | |
75606dc6 RB |
752 | |
753 | out_release: | |
1da177e4 LT |
754 | release_sock(sk); |
755 | ||
75606dc6 | 756 | return err; |
1da177e4 LT |
757 | } |
758 | ||
759 | static int nr_accept(struct socket *sock, struct socket *newsock, int flags) | |
760 | { | |
1da177e4 LT |
761 | struct sk_buff *skb; |
762 | struct sock *newsk; | |
75606dc6 | 763 | DEFINE_WAIT(wait); |
1da177e4 LT |
764 | struct sock *sk; |
765 | int err = 0; | |
766 | ||
767 | if ((sk = sock->sk) == NULL) | |
768 | return -EINVAL; | |
769 | ||
770 | lock_sock(sk); | |
771 | if (sk->sk_type != SOCK_SEQPACKET) { | |
772 | err = -EOPNOTSUPP; | |
75606dc6 | 773 | goto out_release; |
1da177e4 LT |
774 | } |
775 | ||
776 | if (sk->sk_state != TCP_LISTEN) { | |
777 | err = -EINVAL; | |
75606dc6 | 778 | goto out_release; |
1da177e4 LT |
779 | } |
780 | ||
781 | /* | |
782 | * The write queue this time is holding sockets ready to use | |
783 | * hooked into the SABM we saved | |
784 | */ | |
1da177e4 | 785 | for (;;) { |
75606dc6 | 786 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
787 | skb = skb_dequeue(&sk->sk_receive_queue); |
788 | if (skb) | |
789 | break; | |
790 | ||
1da177e4 | 791 | if (flags & O_NONBLOCK) { |
75606dc6 RB |
792 | err = -EWOULDBLOCK; |
793 | break; | |
1da177e4 | 794 | } |
75606dc6 RB |
795 | if (!signal_pending(current)) { |
796 | release_sock(sk); | |
1da177e4 LT |
797 | schedule(); |
798 | lock_sock(sk); | |
799 | continue; | |
800 | } | |
75606dc6 RB |
801 | err = -ERESTARTSYS; |
802 | break; | |
1da177e4 | 803 | } |
75606dc6 RB |
804 | finish_wait(sk->sk_sleep, &wait); |
805 | if (err) | |
806 | goto out_release; | |
1da177e4 LT |
807 | |
808 | newsk = skb->sk; | |
7b66767f | 809 | sock_graft(newsk, newsock); |
1da177e4 LT |
810 | |
811 | /* Now attach up the new socket */ | |
812 | kfree_skb(skb); | |
18601a7d | 813 | sk_acceptq_removed(sk); |
1da177e4 | 814 | |
75606dc6 | 815 | out_release: |
1da177e4 | 816 | release_sock(sk); |
75606dc6 | 817 | |
1da177e4 LT |
818 | return err; |
819 | } | |
820 | ||
821 | static int nr_getname(struct socket *sock, struct sockaddr *uaddr, | |
822 | int *uaddr_len, int peer) | |
823 | { | |
824 | struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr; | |
825 | struct sock *sk = sock->sk; | |
826 | struct nr_sock *nr = nr_sk(sk); | |
827 | ||
828 | lock_sock(sk); | |
829 | if (peer != 0) { | |
830 | if (sk->sk_state != TCP_ESTABLISHED) { | |
831 | release_sock(sk); | |
832 | return -ENOTCONN; | |
833 | } | |
834 | sax->fsa_ax25.sax25_family = AF_NETROM; | |
835 | sax->fsa_ax25.sax25_ndigis = 1; | |
836 | sax->fsa_ax25.sax25_call = nr->user_addr; | |
837 | sax->fsa_digipeater[0] = nr->dest_addr; | |
838 | *uaddr_len = sizeof(struct full_sockaddr_ax25); | |
839 | } else { | |
840 | sax->fsa_ax25.sax25_family = AF_NETROM; | |
841 | sax->fsa_ax25.sax25_ndigis = 0; | |
842 | sax->fsa_ax25.sax25_call = nr->source_addr; | |
843 | *uaddr_len = sizeof(struct sockaddr_ax25); | |
844 | } | |
845 | release_sock(sk); | |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
850 | int nr_rx_frame(struct sk_buff *skb, struct net_device *dev) | |
851 | { | |
852 | struct sock *sk; | |
5f8f59d6 | 853 | struct sock *make; |
1da177e4 LT |
854 | struct nr_sock *nr_make; |
855 | ax25_address *src, *dest, *user; | |
856 | unsigned short circuit_index, circuit_id; | |
857 | unsigned short peer_circuit_index, peer_circuit_id; | |
858 | unsigned short frametype, flags, window, timeout; | |
859 | int ret; | |
860 | ||
861 | skb->sk = NULL; /* Initially we don't know who it's for */ | |
862 | ||
863 | /* | |
864 | * skb->data points to the netrom frame start | |
865 | */ | |
866 | ||
867 | src = (ax25_address *)(skb->data + 0); | |
868 | dest = (ax25_address *)(skb->data + 7); | |
869 | ||
870 | circuit_index = skb->data[15]; | |
871 | circuit_id = skb->data[16]; | |
872 | peer_circuit_index = skb->data[17]; | |
873 | peer_circuit_id = skb->data[18]; | |
874 | frametype = skb->data[19] & 0x0F; | |
875 | flags = skb->data[19] & 0xF0; | |
876 | ||
1da177e4 LT |
877 | /* |
878 | * Check for an incoming IP over NET/ROM frame. | |
879 | */ | |
98a82feb RB |
880 | if (frametype == NR_PROTOEXT && |
881 | circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) { | |
1da177e4 | 882 | skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); |
badff6d0 | 883 | skb_reset_transport_header(skb); |
1da177e4 LT |
884 | |
885 | return nr_rx_ip(skb, dev); | |
886 | } | |
1da177e4 LT |
887 | |
888 | /* | |
889 | * Find an existing socket connection, based on circuit ID, if it's | |
890 | * a Connect Request base it on their circuit ID. | |
891 | * | |
892 | * Circuit ID 0/0 is not valid but it could still be a "reset" for a | |
893 | * circuit that no longer exists at the other end ... | |
894 | */ | |
895 | ||
896 | sk = NULL; | |
897 | ||
898 | if (circuit_index == 0 && circuit_id == 0) { | |
899 | if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG) | |
900 | sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src); | |
901 | } else { | |
902 | if (frametype == NR_CONNREQ) | |
903 | sk = nr_find_peer(circuit_index, circuit_id, src); | |
904 | else | |
905 | sk = nr_find_socket(circuit_index, circuit_id); | |
906 | } | |
907 | ||
908 | if (sk != NULL) { | |
badff6d0 | 909 | skb_reset_transport_header(skb); |
1da177e4 LT |
910 | |
911 | if (frametype == NR_CONNACK && skb->len == 22) | |
912 | nr_sk(sk)->bpqext = 1; | |
913 | else | |
914 | nr_sk(sk)->bpqext = 0; | |
915 | ||
916 | ret = nr_process_rx_frame(sk, skb); | |
917 | bh_unlock_sock(sk); | |
918 | return ret; | |
919 | } | |
920 | ||
921 | /* | |
922 | * Now it should be a CONNREQ. | |
923 | */ | |
924 | if (frametype != NR_CONNREQ) { | |
925 | /* | |
926 | * Here it would be nice to be able to send a reset but | |
e21ce8c7 RB |
927 | * NET/ROM doesn't have one. We've tried to extend the protocol |
928 | * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that | |
929 | * apparently kills BPQ boxes... :-( | |
930 | * So now we try to follow the established behaviour of | |
931 | * G8PZT's Xrouter which is sending packets with command type 7 | |
932 | * as an extension of the protocol. | |
1da177e4 | 933 | */ |
e21ce8c7 RB |
934 | if (sysctl_netrom_reset_circuit && |
935 | (frametype != NR_RESET || flags != 0)) | |
936 | nr_transmit_reset(skb, 1); | |
937 | ||
1da177e4 LT |
938 | return 0; |
939 | } | |
940 | ||
941 | sk = nr_find_listener(dest); | |
942 | ||
943 | user = (ax25_address *)(skb->data + 21); | |
944 | ||
945 | if (sk == NULL || sk_acceptq_is_full(sk) || | |
946 | (make = nr_make_new(sk)) == NULL) { | |
947 | nr_transmit_refusal(skb, 0); | |
948 | if (sk) | |
949 | bh_unlock_sock(sk); | |
950 | return 0; | |
951 | } | |
952 | ||
953 | window = skb->data[20]; | |
954 | ||
955 | skb->sk = make; | |
956 | make->sk_state = TCP_ESTABLISHED; | |
957 | ||
958 | /* Fill in his circuit details */ | |
959 | nr_make = nr_sk(make); | |
960 | nr_make->source_addr = *dest; | |
961 | nr_make->dest_addr = *src; | |
962 | nr_make->user_addr = *user; | |
963 | ||
964 | nr_make->your_index = circuit_index; | |
965 | nr_make->your_id = circuit_id; | |
966 | ||
967 | bh_unlock_sock(sk); | |
968 | circuit = nr_find_next_circuit(); | |
969 | bh_lock_sock(sk); | |
970 | ||
971 | nr_make->my_index = circuit / 256; | |
972 | nr_make->my_id = circuit % 256; | |
973 | ||
974 | circuit++; | |
975 | ||
976 | /* Window negotiation */ | |
977 | if (window < nr_make->window) | |
978 | nr_make->window = window; | |
979 | ||
980 | /* L4 timeout negotiation */ | |
981 | if (skb->len == 37) { | |
982 | timeout = skb->data[36] * 256 + skb->data[35]; | |
983 | if (timeout * HZ < nr_make->t1) | |
984 | nr_make->t1 = timeout * HZ; | |
985 | nr_make->bpqext = 1; | |
986 | } else { | |
987 | nr_make->bpqext = 0; | |
988 | } | |
989 | ||
990 | nr_write_internal(make, NR_CONNACK); | |
991 | ||
992 | nr_make->condition = 0x00; | |
993 | nr_make->vs = 0; | |
994 | nr_make->va = 0; | |
995 | nr_make->vr = 0; | |
996 | nr_make->vl = 0; | |
997 | nr_make->state = NR_STATE_3; | |
18601a7d | 998 | sk_acceptq_added(sk); |
1da177e4 LT |
999 | skb_queue_head(&sk->sk_receive_queue, skb); |
1000 | ||
1da177e4 LT |
1001 | if (!sock_flag(sk, SOCK_DEAD)) |
1002 | sk->sk_data_ready(sk, skb->len); | |
1003 | ||
1004 | bh_unlock_sock(sk); | |
5cc29e3b RB |
1005 | |
1006 | nr_insert_socket(make); | |
1007 | ||
1008 | nr_start_heartbeat(make); | |
1009 | nr_start_idletimer(make); | |
1010 | ||
1da177e4 LT |
1011 | return 1; |
1012 | } | |
1013 | ||
1014 | static int nr_sendmsg(struct kiocb *iocb, struct socket *sock, | |
1015 | struct msghdr *msg, size_t len) | |
1016 | { | |
1017 | struct sock *sk = sock->sk; | |
1018 | struct nr_sock *nr = nr_sk(sk); | |
1019 | struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name; | |
1020 | int err; | |
1021 | struct sockaddr_ax25 sax; | |
1022 | struct sk_buff *skb; | |
1023 | unsigned char *asmptr; | |
1024 | int size; | |
1025 | ||
1026 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) | |
1027 | return -EINVAL; | |
1028 | ||
1029 | lock_sock(sk); | |
1030 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
1031 | err = -EADDRNOTAVAIL; | |
1032 | goto out; | |
1033 | } | |
1034 | ||
1035 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
1036 | send_sig(SIGPIPE, current, 0); | |
1037 | err = -EPIPE; | |
1038 | goto out; | |
1039 | } | |
1040 | ||
1041 | if (nr->device == NULL) { | |
1042 | err = -ENETUNREACH; | |
1043 | goto out; | |
1044 | } | |
1045 | ||
1046 | if (usax) { | |
1047 | if (msg->msg_namelen < sizeof(sax)) { | |
1048 | err = -EINVAL; | |
1049 | goto out; | |
1050 | } | |
1051 | sax = *usax; | |
1052 | if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) { | |
1053 | err = -EISCONN; | |
1054 | goto out; | |
1055 | } | |
1056 | if (sax.sax25_family != AF_NETROM) { | |
1057 | err = -EINVAL; | |
1058 | goto out; | |
1059 | } | |
1060 | } else { | |
1061 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1062 | err = -ENOTCONN; | |
1063 | goto out; | |
1064 | } | |
1065 | sax.sax25_family = AF_NETROM; | |
1066 | sax.sax25_call = nr->dest_addr; | |
1067 | } | |
1068 | ||
1069 | SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n"); | |
1070 | ||
1071 | /* Build a packet */ | |
1072 | SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n"); | |
1073 | size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN; | |
1074 | ||
1075 | if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL) | |
1076 | goto out; | |
1077 | ||
1078 | skb_reserve(skb, size - len); | |
eeeb0374 | 1079 | skb_reset_transport_header(skb); |
1da177e4 LT |
1080 | |
1081 | /* | |
1082 | * Push down the NET/ROM header | |
1083 | */ | |
1084 | ||
1085 | asmptr = skb_push(skb, NR_TRANSPORT_LEN); | |
1086 | SOCK_DEBUG(sk, "Building NET/ROM Header.\n"); | |
1087 | ||
1088 | /* Build a NET/ROM Transport header */ | |
1089 | ||
1090 | *asmptr++ = nr->your_index; | |
1091 | *asmptr++ = nr->your_id; | |
1092 | *asmptr++ = 0; /* To be filled in later */ | |
1093 | *asmptr++ = 0; /* Ditto */ | |
1094 | *asmptr++ = NR_INFO; | |
1095 | SOCK_DEBUG(sk, "Built header.\n"); | |
1096 | ||
1097 | /* | |
1098 | * Put the data on the end | |
1099 | */ | |
eeeb0374 | 1100 | skb_put(skb, len); |
1da177e4 | 1101 | |
1da177e4 LT |
1102 | SOCK_DEBUG(sk, "NET/ROM: Appending user data\n"); |
1103 | ||
1104 | /* User data follows immediately after the NET/ROM transport header */ | |
eeeb0374 | 1105 | if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) { |
1da177e4 LT |
1106 | kfree_skb(skb); |
1107 | err = -EFAULT; | |
1108 | goto out; | |
1109 | } | |
1110 | ||
1111 | SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n"); | |
1112 | ||
1113 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1114 | kfree_skb(skb); | |
1115 | err = -ENOTCONN; | |
1116 | goto out; | |
1117 | } | |
1118 | ||
1119 | nr_output(sk, skb); /* Shove it onto the queue */ | |
1120 | ||
1121 | err = len; | |
1122 | out: | |
1123 | release_sock(sk); | |
1124 | return err; | |
1125 | } | |
1126 | ||
1127 | static int nr_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1128 | struct msghdr *msg, size_t size, int flags) | |
1129 | { | |
1130 | struct sock *sk = sock->sk; | |
1131 | struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name; | |
1132 | size_t copied; | |
1133 | struct sk_buff *skb; | |
1134 | int er; | |
1135 | ||
1136 | /* | |
1137 | * This works for seqpacket too. The receiver has ordered the queue for | |
1138 | * us! We do one quick check first though | |
1139 | */ | |
1140 | ||
1141 | lock_sock(sk); | |
1142 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1143 | release_sock(sk); | |
1144 | return -ENOTCONN; | |
1145 | } | |
1146 | ||
1147 | /* Now we can treat all alike */ | |
1148 | if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) { | |
1149 | release_sock(sk); | |
1150 | return er; | |
1151 | } | |
1152 | ||
badff6d0 | 1153 | skb_reset_transport_header(skb); |
1da177e4 LT |
1154 | copied = skb->len; |
1155 | ||
1156 | if (copied > size) { | |
1157 | copied = size; | |
1158 | msg->msg_flags |= MSG_TRUNC; | |
1159 | } | |
1160 | ||
1161 | skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1162 | ||
1163 | if (sax != NULL) { | |
1164 | sax->sax25_family = AF_NETROM; | |
d626f62b ACM |
1165 | skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call, |
1166 | AX25_ADDR_LEN); | |
1da177e4 LT |
1167 | } |
1168 | ||
1169 | msg->msg_namelen = sizeof(*sax); | |
1170 | ||
1171 | skb_free_datagram(sk, skb); | |
1172 | ||
1173 | release_sock(sk); | |
1174 | return copied; | |
1175 | } | |
1176 | ||
1177 | ||
1178 | static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1179 | { | |
1180 | struct sock *sk = sock->sk; | |
1181 | void __user *argp = (void __user *)arg; | |
1182 | int ret; | |
1183 | ||
1da177e4 LT |
1184 | switch (cmd) { |
1185 | case TIOCOUTQ: { | |
1186 | long amount; | |
5ff7630e CH |
1187 | |
1188 | lock_sock(sk); | |
1da177e4 LT |
1189 | amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); |
1190 | if (amount < 0) | |
1191 | amount = 0; | |
1192 | release_sock(sk); | |
1193 | return put_user(amount, (int __user *)argp); | |
1194 | } | |
1195 | ||
1196 | case TIOCINQ: { | |
1197 | struct sk_buff *skb; | |
1198 | long amount = 0L; | |
5ff7630e CH |
1199 | |
1200 | lock_sock(sk); | |
1da177e4 LT |
1201 | /* These two are safe on a single CPU system as only user tasks fiddle here */ |
1202 | if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) | |
1203 | amount = skb->len; | |
1204 | release_sock(sk); | |
1205 | return put_user(amount, (int __user *)argp); | |
1206 | } | |
1207 | ||
1208 | case SIOCGSTAMP: | |
5ff7630e | 1209 | lock_sock(sk); |
9b37ee75 | 1210 | ret = sock_get_timestamp(sk, argp); |
1da177e4 LT |
1211 | release_sock(sk); |
1212 | return ret; | |
1213 | ||
ae40eb1e ED |
1214 | case SIOCGSTAMPNS: |
1215 | lock_sock(sk); | |
1216 | ret = sock_get_timestampns(sk, argp); | |
1217 | release_sock(sk); | |
1218 | return ret; | |
1219 | ||
1da177e4 LT |
1220 | case SIOCGIFADDR: |
1221 | case SIOCSIFADDR: | |
1222 | case SIOCGIFDSTADDR: | |
1223 | case SIOCSIFDSTADDR: | |
1224 | case SIOCGIFBRDADDR: | |
1225 | case SIOCSIFBRDADDR: | |
1226 | case SIOCGIFNETMASK: | |
1227 | case SIOCSIFNETMASK: | |
1228 | case SIOCGIFMETRIC: | |
1229 | case SIOCSIFMETRIC: | |
1da177e4 LT |
1230 | return -EINVAL; |
1231 | ||
1232 | case SIOCADDRT: | |
1233 | case SIOCDELRT: | |
1234 | case SIOCNRDECOBS: | |
1da177e4 LT |
1235 | if (!capable(CAP_NET_ADMIN)) return -EPERM; |
1236 | return nr_rt_ioctl(cmd, argp); | |
1237 | ||
1238 | default: | |
b5e5fa5e | 1239 | return -ENOIOCTLCMD; |
1da177e4 | 1240 | } |
1da177e4 LT |
1241 | |
1242 | return 0; | |
1243 | } | |
1244 | ||
1245 | #ifdef CONFIG_PROC_FS | |
1246 | ||
1247 | static void *nr_info_start(struct seq_file *seq, loff_t *pos) | |
1248 | { | |
1249 | struct sock *s; | |
1250 | struct hlist_node *node; | |
1251 | int i = 1; | |
1252 | ||
1253 | spin_lock_bh(&nr_list_lock); | |
1254 | if (*pos == 0) | |
1255 | return SEQ_START_TOKEN; | |
1256 | ||
1257 | sk_for_each(s, node, &nr_list) { | |
1258 | if (i == *pos) | |
1259 | return s; | |
1260 | ++i; | |
1261 | } | |
1262 | return NULL; | |
1263 | } | |
1264 | ||
1265 | static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos) | |
1266 | { | |
1267 | ++*pos; | |
1268 | ||
5f8f59d6 | 1269 | return (v == SEQ_START_TOKEN) ? sk_head(&nr_list) |
1da177e4 LT |
1270 | : sk_next((struct sock *)v); |
1271 | } | |
5f8f59d6 | 1272 | |
1da177e4 LT |
1273 | static void nr_info_stop(struct seq_file *seq, void *v) |
1274 | { | |
1275 | spin_unlock_bh(&nr_list_lock); | |
1276 | } | |
1277 | ||
1278 | static int nr_info_show(struct seq_file *seq, void *v) | |
1279 | { | |
1280 | struct sock *s = v; | |
1281 | struct net_device *dev; | |
1282 | struct nr_sock *nr; | |
1283 | const char *devname; | |
f75268cd | 1284 | char buf[11]; |
1da177e4 LT |
1285 | |
1286 | if (v == SEQ_START_TOKEN) | |
1287 | seq_puts(seq, | |
1288 | "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"); | |
1289 | ||
1290 | else { | |
1291 | ||
1292 | bh_lock_sock(s); | |
1293 | nr = nr_sk(s); | |
1294 | ||
1295 | if ((dev = nr->device) == NULL) | |
1296 | devname = "???"; | |
1297 | else | |
1298 | devname = dev->name; | |
1299 | ||
f75268cd RB |
1300 | seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr)); |
1301 | seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr)); | |
5f8f59d6 | 1302 | seq_printf(seq, |
1da177e4 | 1303 | "%-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 | 1304 | ax2asc(buf, &nr->source_addr), |
1da177e4 LT |
1305 | devname, |
1306 | nr->my_index, | |
1307 | nr->my_id, | |
1308 | nr->your_index, | |
1309 | nr->your_id, | |
1310 | nr->state, | |
1311 | nr->vs, | |
1312 | nr->vr, | |
1313 | nr->va, | |
1314 | ax25_display_timer(&nr->t1timer) / HZ, | |
1315 | nr->t1 / HZ, | |
1316 | ax25_display_timer(&nr->t2timer) / HZ, | |
1317 | nr->t2 / HZ, | |
1318 | ax25_display_timer(&nr->t4timer) / HZ, | |
1319 | nr->t4 / HZ, | |
1320 | ax25_display_timer(&nr->idletimer) / (60 * HZ), | |
1321 | nr->idle / (60 * HZ), | |
1322 | nr->n2count, | |
1323 | nr->n2, | |
1324 | nr->window, | |
1325 | atomic_read(&s->sk_wmem_alloc), | |
1326 | atomic_read(&s->sk_rmem_alloc), | |
1327 | s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); | |
1328 | ||
1329 | bh_unlock_sock(s); | |
1330 | } | |
1331 | return 0; | |
1332 | } | |
1333 | ||
56b3d975 | 1334 | static const struct seq_operations nr_info_seqops = { |
1da177e4 LT |
1335 | .start = nr_info_start, |
1336 | .next = nr_info_next, | |
1337 | .stop = nr_info_stop, | |
1338 | .show = nr_info_show, | |
1339 | }; | |
5f8f59d6 | 1340 | |
1da177e4 LT |
1341 | static int nr_info_open(struct inode *inode, struct file *file) |
1342 | { | |
1343 | return seq_open(file, &nr_info_seqops); | |
1344 | } | |
5f8f59d6 | 1345 | |
da7071d7 | 1346 | static const struct file_operations nr_info_fops = { |
1da177e4 LT |
1347 | .owner = THIS_MODULE, |
1348 | .open = nr_info_open, | |
1349 | .read = seq_read, | |
1350 | .llseek = seq_lseek, | |
1351 | .release = seq_release, | |
1352 | }; | |
1353 | #endif /* CONFIG_PROC_FS */ | |
1354 | ||
1355 | static struct net_proto_family nr_family_ops = { | |
1356 | .family = PF_NETROM, | |
1357 | .create = nr_create, | |
1358 | .owner = THIS_MODULE, | |
1359 | }; | |
1360 | ||
90ddc4f0 | 1361 | static const struct proto_ops nr_proto_ops = { |
1da177e4 LT |
1362 | .family = PF_NETROM, |
1363 | .owner = THIS_MODULE, | |
1364 | .release = nr_release, | |
1365 | .bind = nr_bind, | |
1366 | .connect = nr_connect, | |
1367 | .socketpair = sock_no_socketpair, | |
1368 | .accept = nr_accept, | |
1369 | .getname = nr_getname, | |
1370 | .poll = datagram_poll, | |
1371 | .ioctl = nr_ioctl, | |
1372 | .listen = nr_listen, | |
1373 | .shutdown = sock_no_shutdown, | |
1374 | .setsockopt = nr_setsockopt, | |
1375 | .getsockopt = nr_getsockopt, | |
1376 | .sendmsg = nr_sendmsg, | |
1377 | .recvmsg = nr_recvmsg, | |
1378 | .mmap = sock_no_mmap, | |
1379 | .sendpage = sock_no_sendpage, | |
1380 | }; | |
1381 | ||
1382 | static struct notifier_block nr_dev_notifier = { | |
1383 | .notifier_call = nr_device_event, | |
1384 | }; | |
1385 | ||
1386 | static struct net_device **dev_nr; | |
1387 | ||
8d5cf596 RB |
1388 | static struct ax25_protocol nr_pid = { |
1389 | .pid = AX25_P_NETROM, | |
1390 | .func = nr_route_frame | |
1391 | }; | |
1392 | ||
a4282717 RB |
1393 | static struct ax25_linkfail nr_linkfail_notifier = { |
1394 | .func = nr_link_failed, | |
1395 | }; | |
1396 | ||
1da177e4 LT |
1397 | static int __init nr_proto_init(void) |
1398 | { | |
1399 | int i; | |
1400 | int rc = proto_register(&nr_proto, 0); | |
1401 | ||
1402 | if (rc != 0) | |
1403 | goto out; | |
1404 | ||
1405 | if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) { | |
1406 | printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n"); | |
1407 | return -1; | |
1408 | } | |
1409 | ||
1b30dd35 | 1410 | dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL); |
1da177e4 LT |
1411 | if (dev_nr == NULL) { |
1412 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n"); | |
1413 | return -1; | |
1414 | } | |
1415 | ||
1da177e4 LT |
1416 | for (i = 0; i < nr_ndevs; i++) { |
1417 | char name[IFNAMSIZ]; | |
1418 | struct net_device *dev; | |
1419 | ||
1420 | sprintf(name, "nr%d", i); | |
b88a762b | 1421 | dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup); |
1da177e4 LT |
1422 | if (!dev) { |
1423 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n"); | |
1424 | goto fail; | |
1425 | } | |
5f8f59d6 | 1426 | |
1da177e4 LT |
1427 | dev->base_addr = i; |
1428 | if (register_netdev(dev)) { | |
1429 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n"); | |
1430 | free_netdev(dev); | |
1431 | goto fail; | |
1432 | } | |
4b260a98 | 1433 | lockdep_set_class(&dev->_xmit_lock, &nr_netdev_xmit_lock_key); |
1da177e4 LT |
1434 | dev_nr[i] = dev; |
1435 | } | |
1436 | ||
1437 | if (sock_register(&nr_family_ops)) { | |
1438 | printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n"); | |
1439 | goto fail; | |
1440 | } | |
5f8f59d6 | 1441 | |
1da177e4 | 1442 | register_netdevice_notifier(&nr_dev_notifier); |
1da177e4 | 1443 | |
8d5cf596 | 1444 | ax25_register_pid(&nr_pid); |
a4282717 | 1445 | ax25_linkfail_register(&nr_linkfail_notifier); |
1da177e4 LT |
1446 | |
1447 | #ifdef CONFIG_SYSCTL | |
1448 | nr_register_sysctl(); | |
1449 | #endif | |
1450 | ||
1451 | nr_loopback_init(); | |
1452 | ||
457c4cbc EB |
1453 | proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops); |
1454 | proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops); | |
1455 | proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops); | |
1da177e4 LT |
1456 | out: |
1457 | return rc; | |
1458 | fail: | |
1459 | while (--i >= 0) { | |
1460 | unregister_netdev(dev_nr[i]); | |
1461 | free_netdev(dev_nr[i]); | |
1462 | } | |
1463 | kfree(dev_nr); | |
1464 | proto_unregister(&nr_proto); | |
1465 | rc = -1; | |
1466 | goto out; | |
1467 | } | |
1468 | ||
1469 | module_init(nr_proto_init); | |
1470 | ||
1471 | module_param(nr_ndevs, int, 0); | |
1472 | MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices"); | |
1473 | ||
1474 | MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); | |
1475 | MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol"); | |
1476 | MODULE_LICENSE("GPL"); | |
1477 | MODULE_ALIAS_NETPROTO(PF_NETROM); | |
1478 | ||
1479 | static void __exit nr_exit(void) | |
1480 | { | |
1481 | int i; | |
1482 | ||
457c4cbc EB |
1483 | proc_net_remove(&init_net, "nr"); |
1484 | proc_net_remove(&init_net, "nr_neigh"); | |
1485 | proc_net_remove(&init_net, "nr_nodes"); | |
1da177e4 LT |
1486 | nr_loopback_clear(); |
1487 | ||
1488 | nr_rt_free(); | |
1489 | ||
1490 | #ifdef CONFIG_SYSCTL | |
1491 | nr_unregister_sysctl(); | |
1492 | #endif | |
1493 | ||
a4282717 | 1494 | ax25_linkfail_release(&nr_linkfail_notifier); |
1da177e4 LT |
1495 | ax25_protocol_release(AX25_P_NETROM); |
1496 | ||
1497 | unregister_netdevice_notifier(&nr_dev_notifier); | |
1498 | ||
1499 | sock_unregister(PF_NETROM); | |
1500 | ||
1501 | for (i = 0; i < nr_ndevs; i++) { | |
1502 | struct net_device *dev = dev_nr[i]; | |
1503 | if (dev) { | |
1504 | unregister_netdev(dev); | |
1505 | free_netdev(dev); | |
1506 | } | |
1507 | } | |
1508 | ||
1509 | kfree(dev_nr); | |
1510 | proto_unregister(&nr_proto); | |
1511 | } | |
1512 | module_exit(nr_exit); |