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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * |
4 | * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) | |
5 | * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) | |
6 | * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk) | |
7 | */ | |
1da177e4 LT |
8 | #include <linux/module.h> |
9 | #include <linux/moduleparam.h> | |
4fc268d2 | 10 | #include <linux/capability.h> |
1da177e4 LT |
11 | #include <linux/errno.h> |
12 | #include <linux/types.h> | |
13 | #include <linux/socket.h> | |
14 | #include <linux/in.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
1da177e4 | 16 | #include <linux/kernel.h> |
3f07c014 | 17 | #include <linux/sched/signal.h> |
1da177e4 LT |
18 | #include <linux/timer.h> |
19 | #include <linux/string.h> | |
20 | #include <linux/sockios.h> | |
21 | #include <linux/net.h> | |
22 | #include <linux/stat.h> | |
23 | #include <net/ax25.h> | |
24 | #include <linux/inet.h> | |
25 | #include <linux/netdevice.h> | |
26 | #include <linux/if_arp.h> | |
27 | #include <linux/skbuff.h> | |
457c4cbc | 28 | #include <net/net_namespace.h> |
1da177e4 | 29 | #include <net/sock.h> |
dc8e5416 | 30 | #include <linux/uaccess.h> |
1da177e4 LT |
31 | #include <linux/fcntl.h> |
32 | #include <linux/termios.h> /* For TIOCINQ/OUTQ */ | |
33 | #include <linux/mm.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/notifier.h> | |
36 | #include <net/netrom.h> | |
37 | #include <linux/proc_fs.h> | |
38 | #include <linux/seq_file.h> | |
39 | #include <net/ip.h> | |
c752f073 | 40 | #include <net/tcp_states.h> |
1da177e4 LT |
41 | #include <net/arp.h> |
42 | #include <linux/init.h> | |
43 | ||
44 | static int nr_ndevs = 4; | |
45 | ||
46 | int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL; | |
47 | int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS; | |
48 | int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL; | |
49 | int sysctl_netrom_transport_timeout = NR_DEFAULT_T1; | |
50 | int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2; | |
51 | int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2; | |
52 | int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4; | |
53 | int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW; | |
54 | int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE; | |
55 | int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING; | |
56 | int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS; | |
e21ce8c7 | 57 | int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET; |
1da177e4 LT |
58 | |
59 | static unsigned short circuit = 0x101; | |
60 | ||
61 | static HLIST_HEAD(nr_list); | |
62 | static DEFINE_SPINLOCK(nr_list_lock); | |
63 | ||
90ddc4f0 | 64 | static const struct proto_ops nr_proto_ops; |
1da177e4 | 65 | |
4b260a98 RB |
66 | /* |
67 | * NETROM network devices are virtual network devices encapsulating NETROM | |
68 | * frames into AX.25 which will be sent through an AX.25 device, so form a | |
69 | * special "super class" of normal net devices; split their locks off into a | |
70 | * separate class since they always nest. | |
71 | */ | |
72 | static struct lock_class_key nr_netdev_xmit_lock_key; | |
cf508b12 | 73 | static struct lock_class_key nr_netdev_addr_lock_key; |
4b260a98 | 74 | |
e8a0464c DM |
75 | static void nr_set_lockdep_one(struct net_device *dev, |
76 | struct netdev_queue *txq, | |
77 | void *_unused) | |
c773e847 DM |
78 | { |
79 | lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key); | |
80 | } | |
81 | ||
82 | static void nr_set_lockdep_key(struct net_device *dev) | |
83 | { | |
cf508b12 | 84 | lockdep_set_class(&dev->addr_list_lock, &nr_netdev_addr_lock_key); |
e8a0464c | 85 | netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL); |
c773e847 DM |
86 | } |
87 | ||
1da177e4 LT |
88 | /* |
89 | * Socket removal during an interrupt is now safe. | |
90 | */ | |
91 | static void nr_remove_socket(struct sock *sk) | |
92 | { | |
93 | spin_lock_bh(&nr_list_lock); | |
94 | sk_del_node_init(sk); | |
95 | spin_unlock_bh(&nr_list_lock); | |
96 | } | |
97 | ||
98 | /* | |
99 | * Kill all bound sockets on a dropped device. | |
100 | */ | |
101 | static void nr_kill_by_device(struct net_device *dev) | |
102 | { | |
103 | struct sock *s; | |
1da177e4 LT |
104 | |
105 | spin_lock_bh(&nr_list_lock); | |
b67bfe0d | 106 | sk_for_each(s, &nr_list) |
1da177e4 LT |
107 | if (nr_sk(s)->device == dev) |
108 | nr_disconnect(s, ENETUNREACH); | |
109 | spin_unlock_bh(&nr_list_lock); | |
110 | } | |
111 | ||
112 | /* | |
113 | * Handle device status changes. | |
114 | */ | |
115 | static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
116 | { | |
351638e7 | 117 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
1da177e4 | 118 | |
721499e8 | 119 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
120 | return NOTIFY_DONE; |
121 | ||
1da177e4 LT |
122 | if (event != NETDEV_DOWN) |
123 | return NOTIFY_DONE; | |
124 | ||
125 | nr_kill_by_device(dev); | |
126 | nr_rt_device_down(dev); | |
5f8f59d6 | 127 | |
1da177e4 LT |
128 | return NOTIFY_DONE; |
129 | } | |
130 | ||
131 | /* | |
132 | * Add a socket to the bound sockets list. | |
133 | */ | |
134 | static void nr_insert_socket(struct sock *sk) | |
135 | { | |
136 | spin_lock_bh(&nr_list_lock); | |
137 | sk_add_node(sk, &nr_list); | |
138 | spin_unlock_bh(&nr_list_lock); | |
139 | } | |
140 | ||
141 | /* | |
142 | * Find a socket that wants to accept the Connect Request we just | |
143 | * received. | |
144 | */ | |
145 | static struct sock *nr_find_listener(ax25_address *addr) | |
146 | { | |
147 | struct sock *s; | |
1da177e4 LT |
148 | |
149 | spin_lock_bh(&nr_list_lock); | |
b67bfe0d | 150 | sk_for_each(s, &nr_list) |
1da177e4 LT |
151 | if (!ax25cmp(&nr_sk(s)->source_addr, addr) && |
152 | s->sk_state == TCP_LISTEN) { | |
7314f548 | 153 | sock_hold(s); |
1da177e4 LT |
154 | goto found; |
155 | } | |
156 | s = NULL; | |
157 | found: | |
158 | spin_unlock_bh(&nr_list_lock); | |
159 | return s; | |
160 | } | |
161 | ||
162 | /* | |
163 | * Find a connected NET/ROM socket given my circuit IDs. | |
164 | */ | |
165 | static struct sock *nr_find_socket(unsigned char index, unsigned char id) | |
166 | { | |
167 | struct sock *s; | |
1da177e4 LT |
168 | |
169 | spin_lock_bh(&nr_list_lock); | |
b67bfe0d | 170 | sk_for_each(s, &nr_list) { |
1da177e4 | 171 | struct nr_sock *nr = nr_sk(s); |
5f8f59d6 | 172 | |
1da177e4 | 173 | if (nr->my_index == index && nr->my_id == id) { |
7314f548 | 174 | sock_hold(s); |
1da177e4 LT |
175 | goto found; |
176 | } | |
177 | } | |
178 | s = NULL; | |
179 | found: | |
180 | spin_unlock_bh(&nr_list_lock); | |
181 | return s; | |
182 | } | |
183 | ||
184 | /* | |
185 | * Find a connected NET/ROM socket given their circuit IDs. | |
186 | */ | |
187 | static struct sock *nr_find_peer(unsigned char index, unsigned char id, | |
188 | ax25_address *dest) | |
189 | { | |
190 | struct sock *s; | |
1da177e4 LT |
191 | |
192 | spin_lock_bh(&nr_list_lock); | |
b67bfe0d | 193 | sk_for_each(s, &nr_list) { |
1da177e4 | 194 | struct nr_sock *nr = nr_sk(s); |
5f8f59d6 | 195 | |
1da177e4 LT |
196 | if (nr->your_index == index && nr->your_id == id && |
197 | !ax25cmp(&nr->dest_addr, dest)) { | |
7314f548 | 198 | sock_hold(s); |
1da177e4 LT |
199 | goto found; |
200 | } | |
201 | } | |
202 | s = NULL; | |
203 | found: | |
204 | spin_unlock_bh(&nr_list_lock); | |
205 | return s; | |
206 | } | |
207 | ||
208 | /* | |
209 | * Find next free circuit ID. | |
210 | */ | |
211 | static unsigned short nr_find_next_circuit(void) | |
212 | { | |
213 | unsigned short id = circuit; | |
214 | unsigned char i, j; | |
215 | struct sock *sk; | |
216 | ||
217 | for (;;) { | |
218 | i = id / 256; | |
219 | j = id % 256; | |
220 | ||
221 | if (i != 0 && j != 0) { | |
222 | if ((sk=nr_find_socket(i, j)) == NULL) | |
223 | break; | |
7314f548 | 224 | sock_put(sk); |
1da177e4 LT |
225 | } |
226 | ||
227 | id++; | |
228 | } | |
229 | ||
230 | return id; | |
231 | } | |
232 | ||
233 | /* | |
234 | * Deferred destroy. | |
235 | */ | |
236 | void nr_destroy_socket(struct sock *); | |
237 | ||
238 | /* | |
239 | * Handler for deferred kills. | |
240 | */ | |
99767f27 | 241 | static void nr_destroy_timer(struct timer_list *t) |
1da177e4 | 242 | { |
99767f27 | 243 | struct sock *sk = from_timer(sk, t, sk_timer); |
1da177e4 LT |
244 | bh_lock_sock(sk); |
245 | sock_hold(sk); | |
246 | nr_destroy_socket(sk); | |
247 | bh_unlock_sock(sk); | |
248 | sock_put(sk); | |
249 | } | |
250 | ||
251 | /* | |
252 | * This is called from user mode and the timers. Thus it protects itself | |
253 | * against interrupt users but doesn't worry about being called during | |
254 | * work. Once it is removed from the queue no interrupt or bottom half | |
255 | * will touch it and we are (fairly 8-) ) safe. | |
256 | */ | |
257 | void nr_destroy_socket(struct sock *sk) | |
258 | { | |
259 | struct sk_buff *skb; | |
260 | ||
261 | nr_remove_socket(sk); | |
262 | ||
263 | nr_stop_heartbeat(sk); | |
264 | nr_stop_t1timer(sk); | |
265 | nr_stop_t2timer(sk); | |
266 | nr_stop_t4timer(sk); | |
267 | nr_stop_idletimer(sk); | |
268 | ||
269 | nr_clear_queues(sk); /* Flush the queues */ | |
270 | ||
271 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
272 | if (skb->sk != sk) { /* A pending connection */ | |
273 | /* Queue the unaccepted socket for death */ | |
274 | sock_set_flag(skb->sk, SOCK_DEAD); | |
275 | nr_start_heartbeat(skb->sk); | |
276 | nr_sk(skb->sk)->state = NR_STATE_0; | |
277 | } | |
278 | ||
279 | kfree_skb(skb); | |
280 | } | |
281 | ||
c564039f | 282 | if (sk_has_allocations(sk)) { |
1da177e4 | 283 | /* Defer: outstanding buffers */ |
841b86f3 | 284 | sk->sk_timer.function = nr_destroy_timer; |
1da177e4 LT |
285 | sk->sk_timer.expires = jiffies + 2 * HZ; |
286 | add_timer(&sk->sk_timer); | |
287 | } else | |
288 | sock_put(sk); | |
289 | } | |
290 | ||
291 | /* | |
292 | * Handling for system calls applied via the various interfaces to a | |
293 | * NET/ROM socket object. | |
294 | */ | |
295 | ||
296 | static int nr_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 297 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
298 | { |
299 | struct sock *sk = sock->sk; | |
300 | struct nr_sock *nr = nr_sk(sk); | |
32288eb4 | 301 | unsigned long opt; |
1da177e4 LT |
302 | |
303 | if (level != SOL_NETROM) | |
304 | return -ENOPROTOOPT; | |
305 | ||
32288eb4 | 306 | if (optlen < sizeof(unsigned int)) |
1da177e4 LT |
307 | return -EINVAL; |
308 | ||
32288eb4 | 309 | if (get_user(opt, (unsigned int __user *)optval)) |
1da177e4 LT |
310 | return -EFAULT; |
311 | ||
312 | switch (optname) { | |
313 | case NETROM_T1: | |
32288eb4 | 314 | if (opt < 1 || opt > ULONG_MAX / HZ) |
1da177e4 LT |
315 | return -EINVAL; |
316 | nr->t1 = opt * HZ; | |
317 | return 0; | |
318 | ||
319 | case NETROM_T2: | |
32288eb4 | 320 | if (opt < 1 || opt > ULONG_MAX / HZ) |
1da177e4 LT |
321 | return -EINVAL; |
322 | nr->t2 = opt * HZ; | |
323 | return 0; | |
324 | ||
325 | case NETROM_N2: | |
326 | if (opt < 1 || opt > 31) | |
327 | return -EINVAL; | |
328 | nr->n2 = opt; | |
329 | return 0; | |
330 | ||
331 | case NETROM_T4: | |
32288eb4 | 332 | if (opt < 1 || opt > ULONG_MAX / HZ) |
1da177e4 LT |
333 | return -EINVAL; |
334 | nr->t4 = opt * HZ; | |
335 | return 0; | |
336 | ||
337 | case NETROM_IDLE: | |
32288eb4 | 338 | if (opt > ULONG_MAX / (60 * HZ)) |
1da177e4 LT |
339 | return -EINVAL; |
340 | nr->idle = opt * 60 * HZ; | |
341 | return 0; | |
342 | ||
343 | default: | |
344 | return -ENOPROTOOPT; | |
345 | } | |
346 | } | |
347 | ||
348 | static int nr_getsockopt(struct socket *sock, int level, int optname, | |
349 | char __user *optval, int __user *optlen) | |
350 | { | |
351 | struct sock *sk = sock->sk; | |
352 | struct nr_sock *nr = nr_sk(sk); | |
353 | int val = 0; | |
5f8f59d6 | 354 | int len; |
1da177e4 LT |
355 | |
356 | if (level != SOL_NETROM) | |
357 | return -ENOPROTOOPT; | |
5f8f59d6 | 358 | |
1da177e4 LT |
359 | if (get_user(len, optlen)) |
360 | return -EFAULT; | |
361 | ||
362 | if (len < 0) | |
363 | return -EINVAL; | |
5f8f59d6 | 364 | |
1da177e4 LT |
365 | switch (optname) { |
366 | case NETROM_T1: | |
367 | val = nr->t1 / HZ; | |
368 | break; | |
369 | ||
370 | case NETROM_T2: | |
371 | val = nr->t2 / HZ; | |
372 | break; | |
373 | ||
374 | case NETROM_N2: | |
375 | val = nr->n2; | |
376 | break; | |
377 | ||
378 | case NETROM_T4: | |
379 | val = nr->t4 / HZ; | |
380 | break; | |
381 | ||
382 | case NETROM_IDLE: | |
383 | val = nr->idle / (60 * HZ); | |
384 | break; | |
385 | ||
386 | default: | |
387 | return -ENOPROTOOPT; | |
388 | } | |
389 | ||
390 | len = min_t(unsigned int, len, sizeof(int)); | |
391 | ||
392 | if (put_user(len, optlen)) | |
393 | return -EFAULT; | |
394 | ||
395 | return copy_to_user(optval, &val, len) ? -EFAULT : 0; | |
396 | } | |
397 | ||
398 | static int nr_listen(struct socket *sock, int backlog) | |
399 | { | |
400 | struct sock *sk = sock->sk; | |
401 | ||
402 | lock_sock(sk); | |
403 | if (sk->sk_state != TCP_LISTEN) { | |
404 | memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN); | |
405 | sk->sk_max_ack_backlog = backlog; | |
406 | sk->sk_state = TCP_LISTEN; | |
407 | release_sock(sk); | |
408 | return 0; | |
409 | } | |
410 | release_sock(sk); | |
411 | ||
412 | return -EOPNOTSUPP; | |
413 | } | |
414 | ||
415 | static struct proto nr_proto = { | |
416 | .name = "NETROM", | |
417 | .owner = THIS_MODULE, | |
418 | .obj_size = sizeof(struct nr_sock), | |
419 | }; | |
420 | ||
3f378b68 EP |
421 | static int nr_create(struct net *net, struct socket *sock, int protocol, |
422 | int kern) | |
1da177e4 LT |
423 | { |
424 | struct sock *sk; | |
425 | struct nr_sock *nr; | |
426 | ||
09ad9bc7 | 427 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
428 | return -EAFNOSUPPORT; |
429 | ||
1da177e4 LT |
430 | if (sock->type != SOCK_SEQPACKET || protocol != 0) |
431 | return -ESOCKTNOSUPPORT; | |
432 | ||
11aa9c28 | 433 | sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto, kern); |
6257ff21 | 434 | if (sk == NULL) |
1da177e4 LT |
435 | return -ENOMEM; |
436 | ||
437 | nr = nr_sk(sk); | |
438 | ||
439 | sock_init_data(sock, sk); | |
440 | ||
441 | sock->ops = &nr_proto_ops; | |
442 | sk->sk_protocol = protocol; | |
443 | ||
444 | skb_queue_head_init(&nr->ack_queue); | |
445 | skb_queue_head_init(&nr->reseq_queue); | |
446 | skb_queue_head_init(&nr->frag_queue); | |
447 | ||
448 | nr_init_timers(sk); | |
449 | ||
4d8937d0 RB |
450 | nr->t1 = |
451 | msecs_to_jiffies(sysctl_netrom_transport_timeout); | |
452 | nr->t2 = | |
453 | msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay); | |
454 | nr->n2 = | |
455 | msecs_to_jiffies(sysctl_netrom_transport_maximum_tries); | |
456 | nr->t4 = | |
457 | msecs_to_jiffies(sysctl_netrom_transport_busy_delay); | |
458 | nr->idle = | |
459 | msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout); | |
1da177e4 LT |
460 | nr->window = sysctl_netrom_transport_requested_window_size; |
461 | ||
462 | nr->bpqext = 1; | |
463 | nr->state = NR_STATE_0; | |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
468 | static struct sock *nr_make_new(struct sock *osk) | |
469 | { | |
470 | struct sock *sk; | |
471 | struct nr_sock *nr, *onr; | |
472 | ||
473 | if (osk->sk_type != SOCK_SEQPACKET) | |
474 | return NULL; | |
475 | ||
11aa9c28 | 476 | sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot, 0); |
6257ff21 | 477 | if (sk == NULL) |
1da177e4 LT |
478 | return NULL; |
479 | ||
480 | nr = nr_sk(sk); | |
481 | ||
482 | sock_init_data(NULL, sk); | |
483 | ||
484 | sk->sk_type = osk->sk_type; | |
1da177e4 LT |
485 | sk->sk_priority = osk->sk_priority; |
486 | sk->sk_protocol = osk->sk_protocol; | |
487 | sk->sk_rcvbuf = osk->sk_rcvbuf; | |
488 | sk->sk_sndbuf = osk->sk_sndbuf; | |
489 | sk->sk_state = TCP_ESTABLISHED; | |
53b924b3 | 490 | sock_copy_flags(sk, osk); |
1da177e4 LT |
491 | |
492 | skb_queue_head_init(&nr->ack_queue); | |
493 | skb_queue_head_init(&nr->reseq_queue); | |
494 | skb_queue_head_init(&nr->frag_queue); | |
495 | ||
496 | nr_init_timers(sk); | |
497 | ||
498 | onr = nr_sk(osk); | |
499 | ||
500 | nr->t1 = onr->t1; | |
501 | nr->t2 = onr->t2; | |
502 | nr->n2 = onr->n2; | |
503 | nr->t4 = onr->t4; | |
504 | nr->idle = onr->idle; | |
505 | nr->window = onr->window; | |
506 | ||
507 | nr->device = onr->device; | |
508 | nr->bpqext = onr->bpqext; | |
509 | ||
510 | return sk; | |
511 | } | |
512 | ||
513 | static int nr_release(struct socket *sock) | |
514 | { | |
515 | struct sock *sk = sock->sk; | |
516 | struct nr_sock *nr; | |
517 | ||
518 | if (sk == NULL) return 0; | |
519 | ||
520 | sock_hold(sk); | |
859f4c74 | 521 | sock_orphan(sk); |
1da177e4 LT |
522 | lock_sock(sk); |
523 | nr = nr_sk(sk); | |
524 | ||
525 | switch (nr->state) { | |
526 | case NR_STATE_0: | |
527 | case NR_STATE_1: | |
528 | case NR_STATE_2: | |
529 | nr_disconnect(sk, 0); | |
530 | nr_destroy_socket(sk); | |
531 | break; | |
532 | ||
533 | case NR_STATE_3: | |
534 | nr_clear_queues(sk); | |
535 | nr->n2count = 0; | |
536 | nr_write_internal(sk, NR_DISCREQ); | |
537 | nr_start_t1timer(sk); | |
538 | nr_stop_t2timer(sk); | |
539 | nr_stop_t4timer(sk); | |
540 | nr_stop_idletimer(sk); | |
541 | nr->state = NR_STATE_2; | |
542 | sk->sk_state = TCP_CLOSE; | |
543 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
544 | sk->sk_state_change(sk); | |
1da177e4 | 545 | sock_set_flag(sk, SOCK_DESTROY); |
1da177e4 LT |
546 | break; |
547 | ||
548 | default: | |
1da177e4 LT |
549 | break; |
550 | } | |
551 | ||
5f8f59d6 | 552 | sock->sk = NULL; |
1da177e4 LT |
553 | release_sock(sk); |
554 | sock_put(sk); | |
555 | ||
556 | return 0; | |
557 | } | |
558 | ||
559 | static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
560 | { | |
561 | struct sock *sk = sock->sk; | |
562 | struct nr_sock *nr = nr_sk(sk); | |
563 | struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; | |
564 | struct net_device *dev; | |
01d7dd0e RB |
565 | ax25_uid_assoc *user; |
566 | ax25_address *source; | |
1da177e4 LT |
567 | |
568 | lock_sock(sk); | |
569 | if (!sock_flag(sk, SOCK_ZAPPED)) { | |
570 | release_sock(sk); | |
571 | return -EINVAL; | |
572 | } | |
573 | if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) { | |
574 | release_sock(sk); | |
575 | return -EINVAL; | |
576 | } | |
577 | if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) { | |
578 | release_sock(sk); | |
579 | return -EINVAL; | |
580 | } | |
581 | if (addr->fsa_ax25.sax25_family != AF_NETROM) { | |
582 | release_sock(sk); | |
583 | return -EINVAL; | |
584 | } | |
585 | if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) { | |
1da177e4 LT |
586 | release_sock(sk); |
587 | return -EADDRNOTAVAIL; | |
588 | } | |
589 | ||
590 | /* | |
591 | * Only the super user can set an arbitrary user callsign. | |
592 | */ | |
593 | if (addr->fsa_ax25.sax25_ndigis == 1) { | |
594 | if (!capable(CAP_NET_BIND_SERVICE)) { | |
595 | dev_put(dev); | |
596 | release_sock(sk); | |
bf5b30b8 | 597 | return -EPERM; |
1da177e4 LT |
598 | } |
599 | nr->user_addr = addr->fsa_digipeater[0]; | |
600 | nr->source_addr = addr->fsa_ax25.sax25_call; | |
601 | } else { | |
602 | source = &addr->fsa_ax25.sax25_call; | |
603 | ||
ba95b235 | 604 | user = ax25_findbyuid(current_euid()); |
01d7dd0e RB |
605 | if (user) { |
606 | nr->user_addr = user->call; | |
607 | ax25_uid_put(user); | |
608 | } else { | |
1da177e4 LT |
609 | if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { |
610 | release_sock(sk); | |
611 | dev_put(dev); | |
612 | return -EPERM; | |
613 | } | |
01d7dd0e | 614 | nr->user_addr = *source; |
1da177e4 LT |
615 | } |
616 | ||
1da177e4 LT |
617 | nr->source_addr = *source; |
618 | } | |
619 | ||
620 | nr->device = dev; | |
621 | nr_insert_socket(sk); | |
622 | ||
623 | sock_reset_flag(sk, SOCK_ZAPPED); | |
624 | dev_put(dev); | |
625 | release_sock(sk); | |
8849b720 | 626 | |
1da177e4 LT |
627 | return 0; |
628 | } | |
629 | ||
630 | static int nr_connect(struct socket *sock, struct sockaddr *uaddr, | |
631 | int addr_len, int flags) | |
632 | { | |
633 | struct sock *sk = sock->sk; | |
634 | struct nr_sock *nr = nr_sk(sk); | |
635 | struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr; | |
01d7dd0e RB |
636 | ax25_address *source = NULL; |
637 | ax25_uid_assoc *user; | |
1da177e4 | 638 | struct net_device *dev; |
75606dc6 | 639 | int err = 0; |
1da177e4 LT |
640 | |
641 | lock_sock(sk); | |
642 | if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { | |
643 | sock->state = SS_CONNECTED; | |
75606dc6 | 644 | goto out_release; /* Connect completed during a ERESTARTSYS event */ |
1da177e4 LT |
645 | } |
646 | ||
647 | if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { | |
648 | sock->state = SS_UNCONNECTED; | |
75606dc6 RB |
649 | err = -ECONNREFUSED; |
650 | goto out_release; | |
1da177e4 LT |
651 | } |
652 | ||
653 | if (sk->sk_state == TCP_ESTABLISHED) { | |
75606dc6 RB |
654 | err = -EISCONN; /* No reconnect on a seqpacket socket */ |
655 | goto out_release; | |
1da177e4 LT |
656 | } |
657 | ||
5f8f59d6 | 658 | sk->sk_state = TCP_CLOSE; |
1da177e4 LT |
659 | sock->state = SS_UNCONNECTED; |
660 | ||
661 | if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) { | |
75606dc6 RB |
662 | err = -EINVAL; |
663 | goto out_release; | |
1da177e4 LT |
664 | } |
665 | if (addr->sax25_family != AF_NETROM) { | |
75606dc6 RB |
666 | err = -EINVAL; |
667 | goto out_release; | |
1da177e4 LT |
668 | } |
669 | if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */ | |
670 | sock_reset_flag(sk, SOCK_ZAPPED); | |
671 | ||
672 | if ((dev = nr_dev_first()) == NULL) { | |
75606dc6 RB |
673 | err = -ENETUNREACH; |
674 | goto out_release; | |
1da177e4 LT |
675 | } |
676 | source = (ax25_address *)dev->dev_addr; | |
677 | ||
ba95b235 | 678 | user = ax25_findbyuid(current_euid()); |
01d7dd0e RB |
679 | if (user) { |
680 | nr->user_addr = user->call; | |
681 | ax25_uid_put(user); | |
682 | } else { | |
1da177e4 LT |
683 | if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) { |
684 | dev_put(dev); | |
75606dc6 RB |
685 | err = -EPERM; |
686 | goto out_release; | |
1da177e4 | 687 | } |
01d7dd0e | 688 | nr->user_addr = *source; |
1da177e4 LT |
689 | } |
690 | ||
1da177e4 LT |
691 | nr->source_addr = *source; |
692 | nr->device = dev; | |
693 | ||
694 | dev_put(dev); | |
695 | nr_insert_socket(sk); /* Finish the bind */ | |
696 | } | |
697 | ||
698 | nr->dest_addr = addr->sax25_call; | |
699 | ||
700 | release_sock(sk); | |
701 | circuit = nr_find_next_circuit(); | |
702 | lock_sock(sk); | |
703 | ||
704 | nr->my_index = circuit / 256; | |
705 | nr->my_id = circuit % 256; | |
706 | ||
707 | circuit++; | |
708 | ||
709 | /* Move to connecting socket, start sending Connect Requests */ | |
710 | sock->state = SS_CONNECTING; | |
711 | sk->sk_state = TCP_SYN_SENT; | |
712 | ||
713 | nr_establish_data_link(sk); | |
714 | ||
715 | nr->state = NR_STATE_1; | |
716 | ||
717 | nr_start_heartbeat(sk); | |
718 | ||
719 | /* Now the loop */ | |
720 | if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { | |
75606dc6 RB |
721 | err = -EINPROGRESS; |
722 | goto out_release; | |
1da177e4 | 723 | } |
5f8f59d6 | 724 | |
1da177e4 LT |
725 | /* |
726 | * A Connect Ack with Choke or timeout or failed routing will go to | |
727 | * closed. | |
728 | */ | |
729 | if (sk->sk_state == TCP_SYN_SENT) { | |
75606dc6 | 730 | DEFINE_WAIT(wait); |
1da177e4 | 731 | |
1da177e4 | 732 | for (;;) { |
aa395145 | 733 | prepare_to_wait(sk_sleep(sk), &wait, |
639fc4c3 | 734 | TASK_INTERRUPTIBLE); |
1da177e4 LT |
735 | if (sk->sk_state != TCP_SYN_SENT) |
736 | break; | |
75606dc6 RB |
737 | if (!signal_pending(current)) { |
738 | release_sock(sk); | |
1da177e4 LT |
739 | schedule(); |
740 | lock_sock(sk); | |
741 | continue; | |
742 | } | |
75606dc6 RB |
743 | err = -ERESTARTSYS; |
744 | break; | |
1da177e4 | 745 | } |
aa395145 | 746 | finish_wait(sk_sleep(sk), &wait); |
75606dc6 RB |
747 | if (err) |
748 | goto out_release; | |
1da177e4 LT |
749 | } |
750 | ||
751 | if (sk->sk_state != TCP_ESTABLISHED) { | |
752 | sock->state = SS_UNCONNECTED; | |
75606dc6 RB |
753 | err = sock_error(sk); /* Always set at this point */ |
754 | goto out_release; | |
1da177e4 LT |
755 | } |
756 | ||
757 | sock->state = SS_CONNECTED; | |
75606dc6 RB |
758 | |
759 | out_release: | |
1da177e4 LT |
760 | release_sock(sk); |
761 | ||
75606dc6 | 762 | return err; |
1da177e4 LT |
763 | } |
764 | ||
cdfbabfb DH |
765 | static int nr_accept(struct socket *sock, struct socket *newsock, int flags, |
766 | bool kern) | |
1da177e4 | 767 | { |
1da177e4 LT |
768 | struct sk_buff *skb; |
769 | struct sock *newsk; | |
75606dc6 | 770 | DEFINE_WAIT(wait); |
1da177e4 LT |
771 | struct sock *sk; |
772 | int err = 0; | |
773 | ||
774 | if ((sk = sock->sk) == NULL) | |
775 | return -EINVAL; | |
776 | ||
777 | lock_sock(sk); | |
778 | if (sk->sk_type != SOCK_SEQPACKET) { | |
779 | err = -EOPNOTSUPP; | |
75606dc6 | 780 | goto out_release; |
1da177e4 LT |
781 | } |
782 | ||
783 | if (sk->sk_state != TCP_LISTEN) { | |
784 | err = -EINVAL; | |
75606dc6 | 785 | goto out_release; |
1da177e4 LT |
786 | } |
787 | ||
788 | /* | |
789 | * The write queue this time is holding sockets ready to use | |
790 | * hooked into the SABM we saved | |
791 | */ | |
1da177e4 | 792 | for (;;) { |
aa395145 | 793 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
794 | skb = skb_dequeue(&sk->sk_receive_queue); |
795 | if (skb) | |
796 | break; | |
797 | ||
1da177e4 | 798 | if (flags & O_NONBLOCK) { |
75606dc6 RB |
799 | err = -EWOULDBLOCK; |
800 | break; | |
1da177e4 | 801 | } |
75606dc6 RB |
802 | if (!signal_pending(current)) { |
803 | release_sock(sk); | |
1da177e4 LT |
804 | schedule(); |
805 | lock_sock(sk); | |
806 | continue; | |
807 | } | |
75606dc6 RB |
808 | err = -ERESTARTSYS; |
809 | break; | |
1da177e4 | 810 | } |
aa395145 | 811 | finish_wait(sk_sleep(sk), &wait); |
75606dc6 RB |
812 | if (err) |
813 | goto out_release; | |
1da177e4 LT |
814 | |
815 | newsk = skb->sk; | |
7b66767f | 816 | sock_graft(newsk, newsock); |
1da177e4 LT |
817 | |
818 | /* Now attach up the new socket */ | |
819 | kfree_skb(skb); | |
18601a7d | 820 | sk_acceptq_removed(sk); |
1da177e4 | 821 | |
75606dc6 | 822 | out_release: |
1da177e4 | 823 | release_sock(sk); |
75606dc6 | 824 | |
1da177e4 LT |
825 | return err; |
826 | } | |
827 | ||
828 | static int nr_getname(struct socket *sock, struct sockaddr *uaddr, | |
9b2c45d4 | 829 | int peer) |
1da177e4 LT |
830 | { |
831 | struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr; | |
832 | struct sock *sk = sock->sk; | |
833 | struct nr_sock *nr = nr_sk(sk); | |
9b2c45d4 | 834 | int uaddr_len; |
1da177e4 | 835 | |
7a3b6843 DC |
836 | memset(&sax->fsa_ax25, 0, sizeof(struct sockaddr_ax25)); |
837 | ||
1da177e4 LT |
838 | lock_sock(sk); |
839 | if (peer != 0) { | |
840 | if (sk->sk_state != TCP_ESTABLISHED) { | |
841 | release_sock(sk); | |
842 | return -ENOTCONN; | |
843 | } | |
844 | sax->fsa_ax25.sax25_family = AF_NETROM; | |
845 | sax->fsa_ax25.sax25_ndigis = 1; | |
846 | sax->fsa_ax25.sax25_call = nr->user_addr; | |
f6b97b29 | 847 | memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater)); |
1da177e4 | 848 | sax->fsa_digipeater[0] = nr->dest_addr; |
9b2c45d4 | 849 | uaddr_len = sizeof(struct full_sockaddr_ax25); |
1da177e4 LT |
850 | } else { |
851 | sax->fsa_ax25.sax25_family = AF_NETROM; | |
852 | sax->fsa_ax25.sax25_ndigis = 0; | |
853 | sax->fsa_ax25.sax25_call = nr->source_addr; | |
9b2c45d4 | 854 | uaddr_len = sizeof(struct sockaddr_ax25); |
1da177e4 LT |
855 | } |
856 | release_sock(sk); | |
857 | ||
9b2c45d4 | 858 | return uaddr_len; |
1da177e4 LT |
859 | } |
860 | ||
861 | int nr_rx_frame(struct sk_buff *skb, struct net_device *dev) | |
862 | { | |
863 | struct sock *sk; | |
5f8f59d6 | 864 | struct sock *make; |
1da177e4 LT |
865 | struct nr_sock *nr_make; |
866 | ax25_address *src, *dest, *user; | |
867 | unsigned short circuit_index, circuit_id; | |
868 | unsigned short peer_circuit_index, peer_circuit_id; | |
869 | unsigned short frametype, flags, window, timeout; | |
870 | int ret; | |
871 | ||
872 | skb->sk = NULL; /* Initially we don't know who it's for */ | |
873 | ||
874 | /* | |
875 | * skb->data points to the netrom frame start | |
876 | */ | |
877 | ||
878 | src = (ax25_address *)(skb->data + 0); | |
879 | dest = (ax25_address *)(skb->data + 7); | |
880 | ||
881 | circuit_index = skb->data[15]; | |
882 | circuit_id = skb->data[16]; | |
883 | peer_circuit_index = skb->data[17]; | |
884 | peer_circuit_id = skb->data[18]; | |
885 | frametype = skb->data[19] & 0x0F; | |
886 | flags = skb->data[19] & 0xF0; | |
887 | ||
1da177e4 LT |
888 | /* |
889 | * Check for an incoming IP over NET/ROM frame. | |
890 | */ | |
98a82feb RB |
891 | if (frametype == NR_PROTOEXT && |
892 | circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) { | |
1da177e4 | 893 | skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); |
badff6d0 | 894 | skb_reset_transport_header(skb); |
1da177e4 LT |
895 | |
896 | return nr_rx_ip(skb, dev); | |
897 | } | |
1da177e4 LT |
898 | |
899 | /* | |
900 | * Find an existing socket connection, based on circuit ID, if it's | |
901 | * a Connect Request base it on their circuit ID. | |
902 | * | |
903 | * Circuit ID 0/0 is not valid but it could still be a "reset" for a | |
904 | * circuit that no longer exists at the other end ... | |
905 | */ | |
906 | ||
907 | sk = NULL; | |
908 | ||
909 | if (circuit_index == 0 && circuit_id == 0) { | |
910 | if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG) | |
911 | sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src); | |
912 | } else { | |
913 | if (frametype == NR_CONNREQ) | |
914 | sk = nr_find_peer(circuit_index, circuit_id, src); | |
915 | else | |
916 | sk = nr_find_socket(circuit_index, circuit_id); | |
917 | } | |
918 | ||
919 | if (sk != NULL) { | |
7314f548 | 920 | bh_lock_sock(sk); |
badff6d0 | 921 | skb_reset_transport_header(skb); |
1da177e4 LT |
922 | |
923 | if (frametype == NR_CONNACK && skb->len == 22) | |
924 | nr_sk(sk)->bpqext = 1; | |
925 | else | |
926 | nr_sk(sk)->bpqext = 0; | |
927 | ||
928 | ret = nr_process_rx_frame(sk, skb); | |
929 | bh_unlock_sock(sk); | |
7314f548 | 930 | sock_put(sk); |
1da177e4 LT |
931 | return ret; |
932 | } | |
933 | ||
934 | /* | |
935 | * Now it should be a CONNREQ. | |
936 | */ | |
937 | if (frametype != NR_CONNREQ) { | |
938 | /* | |
939 | * Here it would be nice to be able to send a reset but | |
e21ce8c7 RB |
940 | * NET/ROM doesn't have one. We've tried to extend the protocol |
941 | * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that | |
942 | * apparently kills BPQ boxes... :-( | |
943 | * So now we try to follow the established behaviour of | |
944 | * G8PZT's Xrouter which is sending packets with command type 7 | |
945 | * as an extension of the protocol. | |
1da177e4 | 946 | */ |
e21ce8c7 RB |
947 | if (sysctl_netrom_reset_circuit && |
948 | (frametype != NR_RESET || flags != 0)) | |
949 | nr_transmit_reset(skb, 1); | |
950 | ||
1da177e4 LT |
951 | return 0; |
952 | } | |
953 | ||
954 | sk = nr_find_listener(dest); | |
955 | ||
956 | user = (ax25_address *)(skb->data + 21); | |
957 | ||
958 | if (sk == NULL || sk_acceptq_is_full(sk) || | |
959 | (make = nr_make_new(sk)) == NULL) { | |
960 | nr_transmit_refusal(skb, 0); | |
961 | if (sk) | |
7314f548 | 962 | sock_put(sk); |
1da177e4 LT |
963 | return 0; |
964 | } | |
965 | ||
7314f548 CW |
966 | bh_lock_sock(sk); |
967 | ||
1da177e4 LT |
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; | |
18601a7d | 1013 | sk_acceptq_added(sk); |
1da177e4 LT |
1014 | skb_queue_head(&sk->sk_receive_queue, skb); |
1015 | ||
1da177e4 | 1016 | if (!sock_flag(sk, SOCK_DEAD)) |
676d2369 | 1017 | sk->sk_data_ready(sk); |
1da177e4 LT |
1018 | |
1019 | bh_unlock_sock(sk); | |
7314f548 | 1020 | sock_put(sk); |
5cc29e3b RB |
1021 | |
1022 | nr_insert_socket(make); | |
1023 | ||
1024 | nr_start_heartbeat(make); | |
1025 | nr_start_idletimer(make); | |
1026 | ||
1da177e4 LT |
1027 | return 1; |
1028 | } | |
1029 | ||
1b784140 | 1030 | static int nr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
1da177e4 LT |
1031 | { |
1032 | struct sock *sk = sock->sk; | |
1033 | struct nr_sock *nr = nr_sk(sk); | |
342dfc30 | 1034 | DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name); |
1da177e4 LT |
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 | ||
83e0bbcb AC |
1084 | /* Build a packet - the conventional user limit is 236 bytes. We can |
1085 | do ludicrously large NetROM frames but must not overflow */ | |
cc29c70d JD |
1086 | if (len > 65536) { |
1087 | err = -EMSGSIZE; | |
1088 | goto out; | |
1089 | } | |
83e0bbcb | 1090 | |
1da177e4 LT |
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); | |
eeeb0374 | 1097 | skb_reset_transport_header(skb); |
1da177e4 LT |
1098 | |
1099 | /* | |
1100 | * Push down the NET/ROM header | |
1101 | */ | |
1102 | ||
1103 | asmptr = skb_push(skb, NR_TRANSPORT_LEN); | |
1da177e4 LT |
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; | |
1da177e4 LT |
1112 | |
1113 | /* | |
1114 | * Put the data on the end | |
1115 | */ | |
eeeb0374 | 1116 | skb_put(skb, len); |
1da177e4 | 1117 | |
1da177e4 | 1118 | /* User data follows immediately after the NET/ROM transport header */ |
6ce8e9ce | 1119 | if (memcpy_from_msg(skb_transport_header(skb), msg, len)) { |
1da177e4 LT |
1120 | kfree_skb(skb); |
1121 | err = -EFAULT; | |
1122 | goto out; | |
1123 | } | |
1124 | ||
1da177e4 LT |
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 | ||
1b784140 YX |
1139 | static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1140 | int flags) | |
1da177e4 LT |
1141 | { |
1142 | struct sock *sk = sock->sk; | |
342dfc30 | 1143 | DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name); |
1da177e4 LT |
1144 | size_t copied; |
1145 | struct sk_buff *skb; | |
1146 | int er; | |
1147 | ||
1148 | /* | |
1149 | * This works for seqpacket too. The receiver has ordered the queue for | |
1150 | * us! We do one quick check first though | |
1151 | */ | |
1152 | ||
1153 | lock_sock(sk); | |
1154 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1155 | release_sock(sk); | |
1156 | return -ENOTCONN; | |
1157 | } | |
1158 | ||
1159 | /* Now we can treat all alike */ | |
1160 | if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) { | |
1161 | release_sock(sk); | |
1162 | return er; | |
1163 | } | |
1164 | ||
badff6d0 | 1165 | skb_reset_transport_header(skb); |
1da177e4 LT |
1166 | copied = skb->len; |
1167 | ||
1168 | if (copied > size) { | |
1169 | copied = size; | |
1170 | msg->msg_flags |= MSG_TRUNC; | |
1171 | } | |
1172 | ||
51f3d02b | 1173 | er = skb_copy_datagram_msg(skb, 0, msg, copied); |
6cf5c951 AC |
1174 | if (er < 0) { |
1175 | skb_free_datagram(sk, skb); | |
1176 | release_sock(sk); | |
1177 | return er; | |
1178 | } | |
1da177e4 LT |
1179 | |
1180 | if (sax != NULL) { | |
c802d759 | 1181 | memset(sax, 0, sizeof(*sax)); |
1da177e4 | 1182 | sax->sax25_family = AF_NETROM; |
d626f62b ACM |
1183 | skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call, |
1184 | AX25_ADDR_LEN); | |
f3d33426 | 1185 | msg->msg_namelen = sizeof(*sax); |
1da177e4 LT |
1186 | } |
1187 | ||
80e20f6f | 1188 | skb_free_datagram(sk, skb); |
1da177e4 LT |
1189 | |
1190 | release_sock(sk); | |
1191 | return copied; | |
1192 | } | |
1193 | ||
1194 | ||
1195 | static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1196 | { | |
1197 | struct sock *sk = sock->sk; | |
1198 | void __user *argp = (void __user *)arg; | |
1da177e4 | 1199 | |
1da177e4 LT |
1200 | switch (cmd) { |
1201 | case TIOCOUTQ: { | |
1202 | long amount; | |
5ff7630e CH |
1203 | |
1204 | lock_sock(sk); | |
31e6d363 | 1205 | amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); |
1da177e4 LT |
1206 | if (amount < 0) |
1207 | amount = 0; | |
1208 | release_sock(sk); | |
1209 | return put_user(amount, (int __user *)argp); | |
1210 | } | |
1211 | ||
1212 | case TIOCINQ: { | |
1213 | struct sk_buff *skb; | |
1214 | long amount = 0L; | |
5ff7630e CH |
1215 | |
1216 | lock_sock(sk); | |
1da177e4 LT |
1217 | /* These two are safe on a single CPU system as only user tasks fiddle here */ |
1218 | if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) | |
1219 | amount = skb->len; | |
1220 | release_sock(sk); | |
1221 | return put_user(amount, (int __user *)argp); | |
1222 | } | |
1223 | ||
1da177e4 LT |
1224 | case SIOCGIFADDR: |
1225 | case SIOCSIFADDR: | |
1226 | case SIOCGIFDSTADDR: | |
1227 | case SIOCSIFDSTADDR: | |
1228 | case SIOCGIFBRDADDR: | |
1229 | case SIOCSIFBRDADDR: | |
1230 | case SIOCGIFNETMASK: | |
1231 | case SIOCSIFNETMASK: | |
1232 | case SIOCGIFMETRIC: | |
1233 | case SIOCSIFMETRIC: | |
1da177e4 LT |
1234 | return -EINVAL; |
1235 | ||
1236 | case SIOCADDRT: | |
1237 | case SIOCDELRT: | |
1238 | case SIOCNRDECOBS: | |
0f20f5a7 RB |
1239 | if (!capable(CAP_NET_ADMIN)) |
1240 | return -EPERM; | |
1da177e4 LT |
1241 | return nr_rt_ioctl(cmd, argp); |
1242 | ||
1243 | default: | |
b5e5fa5e | 1244 | return -ENOIOCTLCMD; |
1da177e4 | 1245 | } |
1da177e4 LT |
1246 | |
1247 | return 0; | |
1248 | } | |
1249 | ||
1250 | #ifdef CONFIG_PROC_FS | |
1251 | ||
1252 | static void *nr_info_start(struct seq_file *seq, loff_t *pos) | |
1253 | { | |
1da177e4 | 1254 | spin_lock_bh(&nr_list_lock); |
90dd7f5a | 1255 | return seq_hlist_start_head(&nr_list, *pos); |
1da177e4 LT |
1256 | } |
1257 | ||
1258 | static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos) | |
1259 | { | |
90dd7f5a | 1260 | return seq_hlist_next(v, &nr_list, pos); |
1da177e4 | 1261 | } |
5f8f59d6 | 1262 | |
1da177e4 LT |
1263 | static void nr_info_stop(struct seq_file *seq, void *v) |
1264 | { | |
1265 | spin_unlock_bh(&nr_list_lock); | |
1266 | } | |
1267 | ||
1268 | static int nr_info_show(struct seq_file *seq, void *v) | |
1269 | { | |
90dd7f5a | 1270 | struct sock *s = sk_entry(v); |
1da177e4 LT |
1271 | struct net_device *dev; |
1272 | struct nr_sock *nr; | |
1273 | const char *devname; | |
f75268cd | 1274 | char buf[11]; |
1da177e4 LT |
1275 | |
1276 | if (v == SEQ_START_TOKEN) | |
1277 | seq_puts(seq, | |
1278 | "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"); | |
1279 | ||
1280 | else { | |
1281 | ||
1282 | bh_lock_sock(s); | |
1283 | nr = nr_sk(s); | |
1284 | ||
1285 | if ((dev = nr->device) == NULL) | |
1286 | devname = "???"; | |
1287 | else | |
1288 | devname = dev->name; | |
1289 | ||
f75268cd RB |
1290 | seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr)); |
1291 | seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr)); | |
5f8f59d6 | 1292 | seq_printf(seq, |
1da177e4 | 1293 | "%-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 | 1294 | ax2asc(buf, &nr->source_addr), |
1da177e4 LT |
1295 | devname, |
1296 | nr->my_index, | |
1297 | nr->my_id, | |
1298 | nr->your_index, | |
1299 | nr->your_id, | |
1300 | nr->state, | |
1301 | nr->vs, | |
1302 | nr->vr, | |
1303 | nr->va, | |
1304 | ax25_display_timer(&nr->t1timer) / HZ, | |
1305 | nr->t1 / HZ, | |
1306 | ax25_display_timer(&nr->t2timer) / HZ, | |
1307 | nr->t2 / HZ, | |
1308 | ax25_display_timer(&nr->t4timer) / HZ, | |
1309 | nr->t4 / HZ, | |
1310 | ax25_display_timer(&nr->idletimer) / (60 * HZ), | |
1311 | nr->idle / (60 * HZ), | |
1312 | nr->n2count, | |
1313 | nr->n2, | |
1314 | nr->window, | |
31e6d363 ED |
1315 | sk_wmem_alloc_get(s), |
1316 | sk_rmem_alloc_get(s), | |
1da177e4 LT |
1317 | s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); |
1318 | ||
1319 | bh_unlock_sock(s); | |
1320 | } | |
1321 | return 0; | |
1322 | } | |
1323 | ||
56b3d975 | 1324 | static const struct seq_operations nr_info_seqops = { |
1da177e4 LT |
1325 | .start = nr_info_start, |
1326 | .next = nr_info_next, | |
1327 | .stop = nr_info_stop, | |
1328 | .show = nr_info_show, | |
1329 | }; | |
1da177e4 LT |
1330 | #endif /* CONFIG_PROC_FS */ |
1331 | ||
ec1b4cf7 | 1332 | static const struct net_proto_family nr_family_ops = { |
1da177e4 LT |
1333 | .family = PF_NETROM, |
1334 | .create = nr_create, | |
1335 | .owner = THIS_MODULE, | |
1336 | }; | |
1337 | ||
90ddc4f0 | 1338 | static const struct proto_ops nr_proto_ops = { |
1da177e4 LT |
1339 | .family = PF_NETROM, |
1340 | .owner = THIS_MODULE, | |
1341 | .release = nr_release, | |
1342 | .bind = nr_bind, | |
1343 | .connect = nr_connect, | |
1344 | .socketpair = sock_no_socketpair, | |
1345 | .accept = nr_accept, | |
1346 | .getname = nr_getname, | |
a11e1d43 | 1347 | .poll = datagram_poll, |
1da177e4 | 1348 | .ioctl = nr_ioctl, |
c7cbdbf2 | 1349 | .gettstamp = sock_gettstamp, |
1da177e4 LT |
1350 | .listen = nr_listen, |
1351 | .shutdown = sock_no_shutdown, | |
1352 | .setsockopt = nr_setsockopt, | |
1353 | .getsockopt = nr_getsockopt, | |
1354 | .sendmsg = nr_sendmsg, | |
1355 | .recvmsg = nr_recvmsg, | |
1356 | .mmap = sock_no_mmap, | |
1357 | .sendpage = sock_no_sendpage, | |
1358 | }; | |
1359 | ||
1360 | static struct notifier_block nr_dev_notifier = { | |
1361 | .notifier_call = nr_device_event, | |
1362 | }; | |
1363 | ||
1364 | static struct net_device **dev_nr; | |
1365 | ||
8d5cf596 RB |
1366 | static struct ax25_protocol nr_pid = { |
1367 | .pid = AX25_P_NETROM, | |
1368 | .func = nr_route_frame | |
1369 | }; | |
1370 | ||
a4282717 RB |
1371 | static struct ax25_linkfail nr_linkfail_notifier = { |
1372 | .func = nr_link_failed, | |
1373 | }; | |
1374 | ||
1da177e4 LT |
1375 | static int __init nr_proto_init(void) |
1376 | { | |
1377 | int i; | |
1378 | int rc = proto_register(&nr_proto, 0); | |
1379 | ||
d3706566 Y |
1380 | if (rc) |
1381 | return rc; | |
1da177e4 LT |
1382 | |
1383 | if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) { | |
d3706566 Y |
1384 | pr_err("NET/ROM: %s - nr_ndevs parameter too large\n", |
1385 | __func__); | |
1386 | rc = -EINVAL; | |
1387 | goto unregister_proto; | |
1da177e4 LT |
1388 | } |
1389 | ||
6396bb22 | 1390 | dev_nr = kcalloc(nr_ndevs, sizeof(struct net_device *), GFP_KERNEL); |
d3706566 Y |
1391 | if (!dev_nr) { |
1392 | pr_err("NET/ROM: %s - unable to allocate device array\n", | |
1393 | __func__); | |
1394 | rc = -ENOMEM; | |
1395 | goto unregister_proto; | |
1da177e4 LT |
1396 | } |
1397 | ||
1da177e4 LT |
1398 | for (i = 0; i < nr_ndevs; i++) { |
1399 | char name[IFNAMSIZ]; | |
1400 | struct net_device *dev; | |
1401 | ||
1402 | sprintf(name, "nr%d", i); | |
c835a677 | 1403 | dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, nr_setup); |
1da177e4 | 1404 | if (!dev) { |
d3706566 | 1405 | rc = -ENOMEM; |
1da177e4 LT |
1406 | goto fail; |
1407 | } | |
5f8f59d6 | 1408 | |
1da177e4 | 1409 | dev->base_addr = i; |
d3706566 Y |
1410 | rc = register_netdev(dev); |
1411 | if (rc) { | |
1da177e4 LT |
1412 | free_netdev(dev); |
1413 | goto fail; | |
1414 | } | |
c773e847 | 1415 | nr_set_lockdep_key(dev); |
1da177e4 LT |
1416 | dev_nr[i] = dev; |
1417 | } | |
1418 | ||
d3706566 Y |
1419 | rc = sock_register(&nr_family_ops); |
1420 | if (rc) | |
1da177e4 | 1421 | goto fail; |
5f8f59d6 | 1422 | |
d3706566 Y |
1423 | rc = register_netdevice_notifier(&nr_dev_notifier); |
1424 | if (rc) | |
1425 | goto out_sock; | |
1da177e4 | 1426 | |
8d5cf596 | 1427 | ax25_register_pid(&nr_pid); |
a4282717 | 1428 | ax25_linkfail_register(&nr_linkfail_notifier); |
1da177e4 LT |
1429 | |
1430 | #ifdef CONFIG_SYSCTL | |
d3706566 Y |
1431 | rc = nr_register_sysctl(); |
1432 | if (rc) | |
1433 | goto out_sysctl; | |
1da177e4 LT |
1434 | #endif |
1435 | ||
1436 | nr_loopback_init(); | |
1437 | ||
d3706566 Y |
1438 | rc = -ENOMEM; |
1439 | if (!proc_create_seq("nr", 0444, init_net.proc_net, &nr_info_seqops)) | |
1440 | goto proc_remove1; | |
1441 | if (!proc_create_seq("nr_neigh", 0444, init_net.proc_net, | |
1442 | &nr_neigh_seqops)) | |
1443 | goto proc_remove2; | |
1444 | if (!proc_create_seq("nr_nodes", 0444, init_net.proc_net, | |
1445 | &nr_node_seqops)) | |
1446 | goto proc_remove3; | |
1447 | ||
1448 | return 0; | |
1449 | ||
1450 | proc_remove3: | |
1451 | remove_proc_entry("nr_neigh", init_net.proc_net); | |
1452 | proc_remove2: | |
1453 | remove_proc_entry("nr", init_net.proc_net); | |
1454 | proc_remove1: | |
1455 | ||
1456 | nr_loopback_clear(); | |
1457 | nr_rt_free(); | |
1458 | ||
1459 | #ifdef CONFIG_SYSCTL | |
1460 | nr_unregister_sysctl(); | |
1461 | out_sysctl: | |
1462 | #endif | |
1463 | ax25_linkfail_release(&nr_linkfail_notifier); | |
1464 | ax25_protocol_release(AX25_P_NETROM); | |
1465 | unregister_netdevice_notifier(&nr_dev_notifier); | |
1466 | out_sock: | |
1467 | sock_unregister(PF_NETROM); | |
1da177e4 LT |
1468 | fail: |
1469 | while (--i >= 0) { | |
1470 | unregister_netdev(dev_nr[i]); | |
1471 | free_netdev(dev_nr[i]); | |
1472 | } | |
1473 | kfree(dev_nr); | |
d3706566 | 1474 | unregister_proto: |
1da177e4 | 1475 | proto_unregister(&nr_proto); |
d3706566 | 1476 | return rc; |
1da177e4 LT |
1477 | } |
1478 | ||
1479 | module_init(nr_proto_init); | |
1480 | ||
1481 | module_param(nr_ndevs, int, 0); | |
1482 | MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices"); | |
1483 | ||
1484 | MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); | |
1485 | MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol"); | |
1486 | MODULE_LICENSE("GPL"); | |
1487 | MODULE_ALIAS_NETPROTO(PF_NETROM); | |
1488 | ||
1489 | static void __exit nr_exit(void) | |
1490 | { | |
1491 | int i; | |
1492 | ||
ece31ffd G |
1493 | remove_proc_entry("nr", init_net.proc_net); |
1494 | remove_proc_entry("nr_neigh", init_net.proc_net); | |
1495 | remove_proc_entry("nr_nodes", init_net.proc_net); | |
1da177e4 LT |
1496 | nr_loopback_clear(); |
1497 | ||
1498 | nr_rt_free(); | |
1499 | ||
1500 | #ifdef CONFIG_SYSCTL | |
1501 | nr_unregister_sysctl(); | |
1502 | #endif | |
1503 | ||
a4282717 | 1504 | ax25_linkfail_release(&nr_linkfail_notifier); |
1da177e4 LT |
1505 | ax25_protocol_release(AX25_P_NETROM); |
1506 | ||
1507 | unregister_netdevice_notifier(&nr_dev_notifier); | |
1508 | ||
1509 | sock_unregister(PF_NETROM); | |
1510 | ||
1511 | for (i = 0; i < nr_ndevs; i++) { | |
1512 | struct net_device *dev = dev_nr[i]; | |
1513 | if (dev) { | |
1514 | unregister_netdev(dev); | |
1515 | free_netdev(dev); | |
1516 | } | |
1517 | } | |
1518 | ||
1519 | kfree(dev_nr); | |
1520 | proto_unregister(&nr_proto); | |
1521 | } | |
1522 | module_exit(nr_exit); |