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1da177e4 LT |
1 | /* |
2 | * X.25 Packet Layer release 002 | |
3 | * | |
4 | * This is ALPHA test software. This code may break your machine, | |
5 | * randomly fail to work with new releases, misbehave and/or generally | |
6 | * screw up. It might even work. | |
7 | * | |
8 | * This code REQUIRES 2.1.15 or higher | |
9 | * | |
10 | * This module: | |
11 | * This module is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | * | |
16 | * History | |
17 | * X.25 001 Jonathan Naylor Started coding. | |
18 | * X.25 002 Jonathan Naylor Centralised disconnect handling. | |
19 | * New timer architecture. | |
20 | * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant. | |
21 | * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of | |
22 | * facilities negotiation and increased | |
23 | * the throughput upper limit. | |
24 | * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups | |
25 | * 2000-09-04 Henner Eisen Set sock->state in x25_accept(). | |
26 | * Fixed x25_output() related skb leakage. | |
27 | * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket. | |
28 | * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation. | |
29 | * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN | |
30 | * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to | |
31 | * x25_proc.c, using seq_file | |
cb65d506 SP |
32 | * 2005-04-02 Shaun Pereira Selective sub address matching |
33 | * with call user data | |
1da177e4 LT |
34 | */ |
35 | ||
36 | #include <linux/config.h> | |
37 | #include <linux/module.h> | |
38 | #include <linux/errno.h> | |
39 | #include <linux/kernel.h> | |
40 | #include <linux/sched.h> | |
41 | #include <linux/timer.h> | |
42 | #include <linux/string.h> | |
43 | #include <linux/net.h> | |
44 | #include <linux/netdevice.h> | |
45 | #include <linux/if_arp.h> | |
46 | #include <linux/skbuff.h> | |
47 | #include <net/sock.h> | |
48 | #include <net/tcp.h> | |
49 | #include <asm/uaccess.h> | |
50 | #include <linux/fcntl.h> | |
51 | #include <linux/termios.h> /* For TIOCINQ/OUTQ */ | |
52 | #include <linux/notifier.h> | |
53 | #include <linux/init.h> | |
54 | #include <net/x25.h> | |
55 | ||
56 | int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; | |
57 | int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; | |
58 | int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; | |
59 | int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; | |
60 | int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; | |
61 | ||
62 | HLIST_HEAD(x25_list); | |
63 | DEFINE_RWLOCK(x25_list_lock); | |
64 | ||
65 | static struct proto_ops x25_proto_ops; | |
66 | ||
67 | static struct x25_address null_x25_address = {" "}; | |
68 | ||
69 | int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, | |
70 | struct x25_address *calling_addr) | |
71 | { | |
72 | int called_len, calling_len; | |
73 | char *called, *calling; | |
74 | int i; | |
75 | ||
76 | called_len = (*p >> 0) & 0x0F; | |
77 | calling_len = (*p >> 4) & 0x0F; | |
78 | ||
79 | called = called_addr->x25_addr; | |
80 | calling = calling_addr->x25_addr; | |
81 | p++; | |
82 | ||
83 | for (i = 0; i < (called_len + calling_len); i++) { | |
84 | if (i < called_len) { | |
85 | if (i % 2 != 0) { | |
86 | *called++ = ((*p >> 0) & 0x0F) + '0'; | |
87 | p++; | |
88 | } else { | |
89 | *called++ = ((*p >> 4) & 0x0F) + '0'; | |
90 | } | |
91 | } else { | |
92 | if (i % 2 != 0) { | |
93 | *calling++ = ((*p >> 0) & 0x0F) + '0'; | |
94 | p++; | |
95 | } else { | |
96 | *calling++ = ((*p >> 4) & 0x0F) + '0'; | |
97 | } | |
98 | } | |
99 | } | |
100 | ||
101 | *called = *calling = '\0'; | |
102 | ||
103 | return 1 + (called_len + calling_len + 1) / 2; | |
104 | } | |
105 | ||
106 | int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, | |
107 | struct x25_address *calling_addr) | |
108 | { | |
109 | unsigned int called_len, calling_len; | |
110 | char *called, *calling; | |
111 | int i; | |
112 | ||
113 | called = called_addr->x25_addr; | |
114 | calling = calling_addr->x25_addr; | |
115 | ||
116 | called_len = strlen(called); | |
117 | calling_len = strlen(calling); | |
118 | ||
119 | *p++ = (calling_len << 4) | (called_len << 0); | |
120 | ||
121 | for (i = 0; i < (called_len + calling_len); i++) { | |
122 | if (i < called_len) { | |
123 | if (i % 2 != 0) { | |
124 | *p |= (*called++ - '0') << 0; | |
125 | p++; | |
126 | } else { | |
127 | *p = 0x00; | |
128 | *p |= (*called++ - '0') << 4; | |
129 | } | |
130 | } else { | |
131 | if (i % 2 != 0) { | |
132 | *p |= (*calling++ - '0') << 0; | |
133 | p++; | |
134 | } else { | |
135 | *p = 0x00; | |
136 | *p |= (*calling++ - '0') << 4; | |
137 | } | |
138 | } | |
139 | } | |
140 | ||
141 | return 1 + (called_len + calling_len + 1) / 2; | |
142 | } | |
143 | ||
144 | /* | |
145 | * Socket removal during an interrupt is now safe. | |
146 | */ | |
147 | static void x25_remove_socket(struct sock *sk) | |
148 | { | |
149 | write_lock_bh(&x25_list_lock); | |
150 | sk_del_node_init(sk); | |
151 | write_unlock_bh(&x25_list_lock); | |
152 | } | |
153 | ||
154 | /* | |
155 | * Kill all bound sockets on a dropped device. | |
156 | */ | |
157 | static void x25_kill_by_device(struct net_device *dev) | |
158 | { | |
159 | struct sock *s; | |
160 | struct hlist_node *node; | |
161 | ||
162 | write_lock_bh(&x25_list_lock); | |
163 | ||
164 | sk_for_each(s, node, &x25_list) | |
165 | if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev) | |
166 | x25_disconnect(s, ENETUNREACH, 0, 0); | |
167 | ||
168 | write_unlock_bh(&x25_list_lock); | |
169 | } | |
170 | ||
171 | /* | |
172 | * Handle device status changes. | |
173 | */ | |
174 | static int x25_device_event(struct notifier_block *this, unsigned long event, | |
175 | void *ptr) | |
176 | { | |
177 | struct net_device *dev = ptr; | |
178 | struct x25_neigh *nb; | |
179 | ||
180 | if (dev->type == ARPHRD_X25 | |
181 | #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE) | |
182 | || dev->type == ARPHRD_ETHER | |
183 | #endif | |
184 | ) { | |
185 | switch (event) { | |
186 | case NETDEV_UP: | |
187 | x25_link_device_up(dev); | |
188 | break; | |
189 | case NETDEV_GOING_DOWN: | |
190 | nb = x25_get_neigh(dev); | |
191 | if (nb) { | |
192 | x25_terminate_link(nb); | |
193 | x25_neigh_put(nb); | |
194 | } | |
195 | break; | |
196 | case NETDEV_DOWN: | |
197 | x25_kill_by_device(dev); | |
198 | x25_route_device_down(dev); | |
199 | x25_link_device_down(dev); | |
200 | break; | |
201 | } | |
202 | } | |
203 | ||
204 | return NOTIFY_DONE; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Add a socket to the bound sockets list. | |
209 | */ | |
210 | static void x25_insert_socket(struct sock *sk) | |
211 | { | |
212 | write_lock_bh(&x25_list_lock); | |
213 | sk_add_node(sk, &x25_list); | |
214 | write_unlock_bh(&x25_list_lock); | |
215 | } | |
216 | ||
217 | /* | |
218 | * Find a socket that wants to accept the Call Request we just | |
219 | * received. Check the full list for an address/cud match. | |
220 | * If no cuds match return the next_best thing, an address match. | |
221 | * Note: if a listening socket has cud set it must only get calls | |
222 | * with matching cud. | |
223 | */ | |
cb65d506 SP |
224 | static struct sock *x25_find_listener(struct x25_address *addr, |
225 | struct sk_buff *skb) | |
1da177e4 LT |
226 | { |
227 | struct sock *s; | |
228 | struct sock *next_best; | |
229 | struct hlist_node *node; | |
230 | ||
231 | read_lock_bh(&x25_list_lock); | |
232 | next_best = NULL; | |
233 | ||
234 | sk_for_each(s, node, &x25_list) | |
235 | if ((!strcmp(addr->x25_addr, | |
cb65d506 SP |
236 | x25_sk(s)->source_addr.x25_addr) || |
237 | !strcmp(addr->x25_addr, | |
238 | null_x25_address.x25_addr)) && | |
239 | s->sk_state == TCP_LISTEN) { | |
1da177e4 LT |
240 | /* |
241 | * Found a listening socket, now check the incoming | |
242 | * call user data vs this sockets call user data | |
243 | */ | |
cb65d506 SP |
244 | if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) { |
245 | if((memcmp(x25_sk(s)->calluserdata.cuddata, | |
246 | skb->data, | |
247 | x25_sk(s)->cudmatchlength)) == 0) { | |
248 | sock_hold(s); | |
249 | goto found; | |
250 | } | |
251 | } else | |
1da177e4 | 252 | next_best = s; |
1da177e4 LT |
253 | } |
254 | if (next_best) { | |
255 | s = next_best; | |
256 | sock_hold(s); | |
257 | goto found; | |
258 | } | |
259 | s = NULL; | |
260 | found: | |
261 | read_unlock_bh(&x25_list_lock); | |
262 | return s; | |
263 | } | |
264 | ||
265 | /* | |
266 | * Find a connected X.25 socket given my LCI and neighbour. | |
267 | */ | |
268 | static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) | |
269 | { | |
270 | struct sock *s; | |
271 | struct hlist_node *node; | |
272 | ||
273 | sk_for_each(s, node, &x25_list) | |
274 | if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { | |
275 | sock_hold(s); | |
276 | goto found; | |
277 | } | |
278 | s = NULL; | |
279 | found: | |
280 | return s; | |
281 | } | |
282 | ||
283 | struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) | |
284 | { | |
285 | struct sock *s; | |
286 | ||
287 | read_lock_bh(&x25_list_lock); | |
288 | s = __x25_find_socket(lci, nb); | |
289 | read_unlock_bh(&x25_list_lock); | |
290 | return s; | |
291 | } | |
292 | ||
293 | /* | |
294 | * Find a unique LCI for a given device. | |
295 | */ | |
296 | static unsigned int x25_new_lci(struct x25_neigh *nb) | |
297 | { | |
298 | unsigned int lci = 1; | |
299 | struct sock *sk; | |
300 | ||
301 | read_lock_bh(&x25_list_lock); | |
302 | ||
303 | while ((sk = __x25_find_socket(lci, nb)) != NULL) { | |
304 | sock_put(sk); | |
305 | if (++lci == 4096) { | |
306 | lci = 0; | |
307 | break; | |
308 | } | |
309 | } | |
310 | ||
311 | read_unlock_bh(&x25_list_lock); | |
312 | return lci; | |
313 | } | |
314 | ||
315 | /* | |
316 | * Deferred destroy. | |
317 | */ | |
318 | void x25_destroy_socket(struct sock *); | |
319 | ||
320 | /* | |
321 | * handler for deferred kills. | |
322 | */ | |
323 | static void x25_destroy_timer(unsigned long data) | |
324 | { | |
325 | x25_destroy_socket((struct sock *)data); | |
326 | } | |
327 | ||
328 | /* | |
329 | * This is called from user mode and the timers. Thus it protects itself | |
330 | * against interrupt users but doesn't worry about being called during | |
331 | * work. Once it is removed from the queue no interrupt or bottom half | |
332 | * will touch it and we are (fairly 8-) ) safe. | |
333 | * Not static as it's used by the timer | |
334 | */ | |
335 | void x25_destroy_socket(struct sock *sk) | |
336 | { | |
337 | struct sk_buff *skb; | |
338 | ||
339 | sock_hold(sk); | |
340 | lock_sock(sk); | |
341 | x25_stop_heartbeat(sk); | |
342 | x25_stop_timer(sk); | |
343 | ||
344 | x25_remove_socket(sk); | |
345 | x25_clear_queues(sk); /* Flush the queues */ | |
346 | ||
347 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
348 | if (skb->sk != sk) { /* A pending connection */ | |
349 | /* | |
350 | * Queue the unaccepted socket for death | |
351 | */ | |
352 | sock_set_flag(skb->sk, SOCK_DEAD); | |
353 | x25_start_heartbeat(skb->sk); | |
354 | x25_sk(skb->sk)->state = X25_STATE_0; | |
355 | } | |
356 | ||
357 | kfree_skb(skb); | |
358 | } | |
359 | ||
360 | if (atomic_read(&sk->sk_wmem_alloc) || | |
361 | atomic_read(&sk->sk_rmem_alloc)) { | |
362 | /* Defer: outstanding buffers */ | |
363 | sk->sk_timer.expires = jiffies + 10 * HZ; | |
364 | sk->sk_timer.function = x25_destroy_timer; | |
365 | sk->sk_timer.data = (unsigned long)sk; | |
366 | add_timer(&sk->sk_timer); | |
367 | } else { | |
368 | /* drop last reference so sock_put will free */ | |
369 | __sock_put(sk); | |
370 | } | |
371 | ||
372 | release_sock(sk); | |
373 | sock_put(sk); | |
374 | } | |
375 | ||
376 | /* | |
377 | * Handling for system calls applied via the various interfaces to a | |
378 | * X.25 socket object. | |
379 | */ | |
380 | ||
381 | static int x25_setsockopt(struct socket *sock, int level, int optname, | |
382 | char __user *optval, int optlen) | |
383 | { | |
384 | int opt; | |
385 | struct sock *sk = sock->sk; | |
386 | int rc = -ENOPROTOOPT; | |
387 | ||
388 | if (level != SOL_X25 || optname != X25_QBITINCL) | |
389 | goto out; | |
390 | ||
391 | rc = -EINVAL; | |
392 | if (optlen < sizeof(int)) | |
393 | goto out; | |
394 | ||
395 | rc = -EFAULT; | |
396 | if (get_user(opt, (int __user *)optval)) | |
397 | goto out; | |
398 | ||
399 | x25_sk(sk)->qbitincl = !!opt; | |
400 | rc = 0; | |
401 | out: | |
402 | return rc; | |
403 | } | |
404 | ||
405 | static int x25_getsockopt(struct socket *sock, int level, int optname, | |
406 | char __user *optval, int __user *optlen) | |
407 | { | |
408 | struct sock *sk = sock->sk; | |
409 | int val, len, rc = -ENOPROTOOPT; | |
410 | ||
411 | if (level != SOL_X25 || optname != X25_QBITINCL) | |
412 | goto out; | |
413 | ||
414 | rc = -EFAULT; | |
415 | if (get_user(len, optlen)) | |
416 | goto out; | |
417 | ||
418 | len = min_t(unsigned int, len, sizeof(int)); | |
419 | ||
420 | rc = -EINVAL; | |
421 | if (len < 0) | |
422 | goto out; | |
423 | ||
424 | rc = -EFAULT; | |
425 | if (put_user(len, optlen)) | |
426 | goto out; | |
427 | ||
428 | val = x25_sk(sk)->qbitincl; | |
429 | rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; | |
430 | out: | |
431 | return rc; | |
432 | } | |
433 | ||
434 | static int x25_listen(struct socket *sock, int backlog) | |
435 | { | |
436 | struct sock *sk = sock->sk; | |
437 | int rc = -EOPNOTSUPP; | |
438 | ||
439 | if (sk->sk_state != TCP_LISTEN) { | |
440 | memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); | |
441 | sk->sk_max_ack_backlog = backlog; | |
442 | sk->sk_state = TCP_LISTEN; | |
443 | rc = 0; | |
444 | } | |
445 | ||
446 | return rc; | |
447 | } | |
448 | ||
449 | static struct proto x25_proto = { | |
450 | .name = "X25", | |
451 | .owner = THIS_MODULE, | |
452 | .obj_size = sizeof(struct x25_sock), | |
453 | }; | |
454 | ||
455 | static struct sock *x25_alloc_socket(void) | |
456 | { | |
457 | struct x25_sock *x25; | |
458 | struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, &x25_proto, 1); | |
459 | ||
460 | if (!sk) | |
461 | goto out; | |
462 | ||
463 | sock_init_data(NULL, sk); | |
464 | ||
465 | x25 = x25_sk(sk); | |
466 | skb_queue_head_init(&x25->ack_queue); | |
467 | skb_queue_head_init(&x25->fragment_queue); | |
468 | skb_queue_head_init(&x25->interrupt_in_queue); | |
469 | skb_queue_head_init(&x25->interrupt_out_queue); | |
470 | out: | |
471 | return sk; | |
472 | } | |
473 | ||
474 | void x25_init_timers(struct sock *sk); | |
475 | ||
476 | static int x25_create(struct socket *sock, int protocol) | |
477 | { | |
478 | struct sock *sk; | |
479 | struct x25_sock *x25; | |
480 | int rc = -ESOCKTNOSUPPORT; | |
481 | ||
482 | if (sock->type != SOCK_SEQPACKET || protocol) | |
483 | goto out; | |
484 | ||
485 | rc = -ENOMEM; | |
486 | if ((sk = x25_alloc_socket()) == NULL) | |
487 | goto out; | |
488 | ||
489 | x25 = x25_sk(sk); | |
490 | ||
491 | sock_init_data(sock, sk); | |
492 | ||
493 | x25_init_timers(sk); | |
494 | ||
495 | sock->ops = &x25_proto_ops; | |
496 | sk->sk_protocol = protocol; | |
497 | sk->sk_backlog_rcv = x25_backlog_rcv; | |
498 | ||
499 | x25->t21 = sysctl_x25_call_request_timeout; | |
500 | x25->t22 = sysctl_x25_reset_request_timeout; | |
501 | x25->t23 = sysctl_x25_clear_request_timeout; | |
502 | x25->t2 = sysctl_x25_ack_holdback_timeout; | |
503 | x25->state = X25_STATE_0; | |
cb65d506 | 504 | x25->cudmatchlength = 0; |
1da177e4 LT |
505 | |
506 | x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; | |
507 | x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; | |
508 | x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; | |
509 | x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; | |
510 | x25->facilities.throughput = X25_DEFAULT_THROUGHPUT; | |
511 | x25->facilities.reverse = X25_DEFAULT_REVERSE; | |
512 | rc = 0; | |
513 | out: | |
514 | return rc; | |
515 | } | |
516 | ||
517 | static struct sock *x25_make_new(struct sock *osk) | |
518 | { | |
519 | struct sock *sk = NULL; | |
520 | struct x25_sock *x25, *ox25; | |
521 | ||
522 | if (osk->sk_type != SOCK_SEQPACKET) | |
523 | goto out; | |
524 | ||
525 | if ((sk = x25_alloc_socket()) == NULL) | |
526 | goto out; | |
527 | ||
528 | x25 = x25_sk(sk); | |
529 | ||
530 | sk->sk_type = osk->sk_type; | |
531 | sk->sk_socket = osk->sk_socket; | |
532 | sk->sk_priority = osk->sk_priority; | |
533 | sk->sk_protocol = osk->sk_protocol; | |
534 | sk->sk_rcvbuf = osk->sk_rcvbuf; | |
535 | sk->sk_sndbuf = osk->sk_sndbuf; | |
536 | sk->sk_state = TCP_ESTABLISHED; | |
537 | sk->sk_sleep = osk->sk_sleep; | |
538 | sk->sk_backlog_rcv = osk->sk_backlog_rcv; | |
539 | ||
540 | if (sock_flag(osk, SOCK_ZAPPED)) | |
541 | sock_set_flag(sk, SOCK_ZAPPED); | |
542 | ||
543 | if (sock_flag(osk, SOCK_DBG)) | |
544 | sock_set_flag(sk, SOCK_DBG); | |
545 | ||
546 | ox25 = x25_sk(osk); | |
547 | x25->t21 = ox25->t21; | |
548 | x25->t22 = ox25->t22; | |
549 | x25->t23 = ox25->t23; | |
550 | x25->t2 = ox25->t2; | |
551 | x25->facilities = ox25->facilities; | |
552 | x25->qbitincl = ox25->qbitincl; | |
cb65d506 | 553 | x25->cudmatchlength = ox25->cudmatchlength; |
1da177e4 LT |
554 | |
555 | x25_init_timers(sk); | |
556 | out: | |
557 | return sk; | |
558 | } | |
559 | ||
560 | static int x25_release(struct socket *sock) | |
561 | { | |
562 | struct sock *sk = sock->sk; | |
563 | struct x25_sock *x25; | |
564 | ||
565 | if (!sk) | |
566 | goto out; | |
567 | ||
568 | x25 = x25_sk(sk); | |
569 | ||
570 | switch (x25->state) { | |
571 | ||
572 | case X25_STATE_0: | |
573 | case X25_STATE_2: | |
574 | x25_disconnect(sk, 0, 0, 0); | |
575 | x25_destroy_socket(sk); | |
576 | goto out; | |
577 | ||
578 | case X25_STATE_1: | |
579 | case X25_STATE_3: | |
580 | case X25_STATE_4: | |
581 | x25_clear_queues(sk); | |
582 | x25_write_internal(sk, X25_CLEAR_REQUEST); | |
583 | x25_start_t23timer(sk); | |
584 | x25->state = X25_STATE_2; | |
585 | sk->sk_state = TCP_CLOSE; | |
586 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
587 | sk->sk_state_change(sk); | |
588 | sock_set_flag(sk, SOCK_DEAD); | |
589 | sock_set_flag(sk, SOCK_DESTROY); | |
590 | break; | |
591 | } | |
592 | ||
593 | sock->sk = NULL; | |
594 | sk->sk_socket = NULL; /* Not used, but we should do this */ | |
595 | out: | |
596 | return 0; | |
597 | } | |
598 | ||
599 | static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
600 | { | |
601 | struct sock *sk = sock->sk; | |
602 | struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; | |
603 | ||
604 | if (!sock_flag(sk, SOCK_ZAPPED) || | |
605 | addr_len != sizeof(struct sockaddr_x25) || | |
606 | addr->sx25_family != AF_X25) | |
607 | return -EINVAL; | |
608 | ||
609 | x25_sk(sk)->source_addr = addr->sx25_addr; | |
610 | x25_insert_socket(sk); | |
611 | sock_reset_flag(sk, SOCK_ZAPPED); | |
612 | SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); | |
613 | ||
614 | return 0; | |
615 | } | |
616 | ||
617 | static int x25_wait_for_connection_establishment(struct sock *sk) | |
618 | { | |
619 | DECLARE_WAITQUEUE(wait, current); | |
620 | int rc; | |
621 | ||
622 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
623 | for (;;) { | |
624 | __set_current_state(TASK_INTERRUPTIBLE); | |
625 | rc = -ERESTARTSYS; | |
626 | if (signal_pending(current)) | |
627 | break; | |
628 | rc = sock_error(sk); | |
629 | if (rc) { | |
630 | sk->sk_socket->state = SS_UNCONNECTED; | |
631 | break; | |
632 | } | |
633 | rc = 0; | |
634 | if (sk->sk_state != TCP_ESTABLISHED) { | |
635 | release_sock(sk); | |
636 | schedule(); | |
637 | lock_sock(sk); | |
638 | } else | |
639 | break; | |
640 | } | |
641 | __set_current_state(TASK_RUNNING); | |
642 | remove_wait_queue(sk->sk_sleep, &wait); | |
643 | return rc; | |
644 | } | |
645 | ||
646 | static int x25_connect(struct socket *sock, struct sockaddr *uaddr, | |
647 | int addr_len, int flags) | |
648 | { | |
649 | struct sock *sk = sock->sk; | |
650 | struct x25_sock *x25 = x25_sk(sk); | |
651 | struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; | |
652 | struct x25_route *rt; | |
653 | int rc = 0; | |
654 | ||
655 | lock_sock(sk); | |
656 | if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { | |
657 | sock->state = SS_CONNECTED; | |
658 | goto out; /* Connect completed during a ERESTARTSYS event */ | |
659 | } | |
660 | ||
661 | rc = -ECONNREFUSED; | |
662 | if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { | |
663 | sock->state = SS_UNCONNECTED; | |
664 | goto out; | |
665 | } | |
666 | ||
667 | rc = -EISCONN; /* No reconnect on a seqpacket socket */ | |
668 | if (sk->sk_state == TCP_ESTABLISHED) | |
669 | goto out; | |
670 | ||
671 | sk->sk_state = TCP_CLOSE; | |
672 | sock->state = SS_UNCONNECTED; | |
673 | ||
674 | rc = -EINVAL; | |
675 | if (addr_len != sizeof(struct sockaddr_x25) || | |
676 | addr->sx25_family != AF_X25) | |
677 | goto out; | |
678 | ||
679 | rc = -ENETUNREACH; | |
680 | rt = x25_get_route(&addr->sx25_addr); | |
681 | if (!rt) | |
682 | goto out; | |
683 | ||
684 | x25->neighbour = x25_get_neigh(rt->dev); | |
685 | if (!x25->neighbour) | |
686 | goto out_put_route; | |
687 | ||
688 | x25_limit_facilities(&x25->facilities, x25->neighbour); | |
689 | ||
690 | x25->lci = x25_new_lci(x25->neighbour); | |
691 | if (!x25->lci) | |
692 | goto out_put_neigh; | |
693 | ||
694 | rc = -EINVAL; | |
695 | if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ | |
696 | goto out_put_neigh; | |
697 | ||
698 | if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) | |
699 | memset(&x25->source_addr, '\0', X25_ADDR_LEN); | |
700 | ||
701 | x25->dest_addr = addr->sx25_addr; | |
702 | ||
703 | /* Move to connecting socket, start sending Connect Requests */ | |
704 | sock->state = SS_CONNECTING; | |
705 | sk->sk_state = TCP_SYN_SENT; | |
706 | ||
707 | x25->state = X25_STATE_1; | |
708 | ||
709 | x25_write_internal(sk, X25_CALL_REQUEST); | |
710 | ||
711 | x25_start_heartbeat(sk); | |
712 | x25_start_t21timer(sk); | |
713 | ||
714 | /* Now the loop */ | |
715 | rc = -EINPROGRESS; | |
716 | if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) | |
717 | goto out_put_neigh; | |
718 | ||
719 | rc = x25_wait_for_connection_establishment(sk); | |
720 | if (rc) | |
721 | goto out_put_neigh; | |
722 | ||
723 | sock->state = SS_CONNECTED; | |
724 | rc = 0; | |
725 | out_put_neigh: | |
726 | if (rc) | |
727 | x25_neigh_put(x25->neighbour); | |
728 | out_put_route: | |
729 | x25_route_put(rt); | |
730 | out: | |
731 | release_sock(sk); | |
732 | return rc; | |
733 | } | |
734 | ||
735 | static int x25_wait_for_data(struct sock *sk, int timeout) | |
736 | { | |
737 | DECLARE_WAITQUEUE(wait, current); | |
738 | int rc = 0; | |
739 | ||
740 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
741 | for (;;) { | |
742 | __set_current_state(TASK_INTERRUPTIBLE); | |
743 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
744 | break; | |
745 | rc = -ERESTARTSYS; | |
746 | if (signal_pending(current)) | |
747 | break; | |
748 | rc = -EAGAIN; | |
749 | if (!timeout) | |
750 | break; | |
751 | rc = 0; | |
752 | if (skb_queue_empty(&sk->sk_receive_queue)) { | |
753 | release_sock(sk); | |
754 | timeout = schedule_timeout(timeout); | |
755 | lock_sock(sk); | |
756 | } else | |
757 | break; | |
758 | } | |
759 | __set_current_state(TASK_RUNNING); | |
760 | remove_wait_queue(sk->sk_sleep, &wait); | |
761 | return rc; | |
762 | } | |
763 | ||
764 | static int x25_accept(struct socket *sock, struct socket *newsock, int flags) | |
765 | { | |
766 | struct sock *sk = sock->sk; | |
767 | struct sock *newsk; | |
768 | struct sk_buff *skb; | |
769 | int rc = -EINVAL; | |
770 | ||
771 | if (!sk || sk->sk_state != TCP_LISTEN) | |
772 | goto out; | |
773 | ||
774 | rc = -EOPNOTSUPP; | |
775 | if (sk->sk_type != SOCK_SEQPACKET) | |
776 | goto out; | |
777 | ||
778 | lock_sock(sk); | |
779 | rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); | |
780 | if (rc) | |
781 | goto out2; | |
782 | skb = skb_dequeue(&sk->sk_receive_queue); | |
783 | rc = -EINVAL; | |
784 | if (!skb->sk) | |
785 | goto out2; | |
786 | newsk = skb->sk; | |
787 | newsk->sk_socket = newsock; | |
788 | newsk->sk_sleep = &newsock->wait; | |
789 | ||
790 | /* Now attach up the new socket */ | |
791 | skb->sk = NULL; | |
792 | kfree_skb(skb); | |
793 | sk->sk_ack_backlog--; | |
794 | newsock->sk = newsk; | |
795 | newsock->state = SS_CONNECTED; | |
796 | rc = 0; | |
797 | out2: | |
798 | release_sock(sk); | |
799 | out: | |
800 | return rc; | |
801 | } | |
802 | ||
803 | static int x25_getname(struct socket *sock, struct sockaddr *uaddr, | |
804 | int *uaddr_len, int peer) | |
805 | { | |
806 | struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; | |
807 | struct sock *sk = sock->sk; | |
808 | struct x25_sock *x25 = x25_sk(sk); | |
809 | ||
810 | if (peer) { | |
811 | if (sk->sk_state != TCP_ESTABLISHED) | |
812 | return -ENOTCONN; | |
813 | sx25->sx25_addr = x25->dest_addr; | |
814 | } else | |
815 | sx25->sx25_addr = x25->source_addr; | |
816 | ||
817 | sx25->sx25_family = AF_X25; | |
818 | *uaddr_len = sizeof(*sx25); | |
819 | ||
820 | return 0; | |
821 | } | |
822 | ||
823 | int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, | |
824 | unsigned int lci) | |
825 | { | |
826 | struct sock *sk; | |
827 | struct sock *make; | |
828 | struct x25_sock *makex25; | |
829 | struct x25_address source_addr, dest_addr; | |
830 | struct x25_facilities facilities; | |
1da177e4 LT |
831 | int len, rc; |
832 | ||
833 | /* | |
834 | * Remove the LCI and frame type. | |
835 | */ | |
836 | skb_pull(skb, X25_STD_MIN_LEN); | |
837 | ||
838 | /* | |
839 | * Extract the X.25 addresses and convert them to ASCII strings, | |
840 | * and remove them. | |
841 | */ | |
842 | skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr)); | |
843 | ||
844 | /* | |
845 | * Get the length of the facilities, skip past them for the moment | |
846 | * get the call user data because this is needed to determine | |
847 | * the correct listener | |
848 | */ | |
849 | len = skb->data[0] + 1; | |
850 | skb_pull(skb,len); | |
851 | ||
1da177e4 LT |
852 | /* |
853 | * Find a listener for the particular address/cud pair. | |
854 | */ | |
cb65d506 SP |
855 | sk = x25_find_listener(&source_addr,skb); |
856 | skb_push(skb,len); | |
1da177e4 LT |
857 | |
858 | /* | |
859 | * We can't accept the Call Request. | |
860 | */ | |
861 | if (sk == NULL || sk_acceptq_is_full(sk)) | |
862 | goto out_clear_request; | |
863 | ||
864 | /* | |
865 | * Try to reach a compromise on the requested facilities. | |
866 | */ | |
867 | if ((len = x25_negotiate_facilities(skb, sk, &facilities)) == -1) | |
868 | goto out_sock_put; | |
869 | ||
870 | /* | |
871 | * current neighbour/link might impose additional limits | |
872 | * on certain facilties | |
873 | */ | |
874 | ||
875 | x25_limit_facilities(&facilities, nb); | |
876 | ||
877 | /* | |
878 | * Try to create a new socket. | |
879 | */ | |
880 | make = x25_make_new(sk); | |
881 | if (!make) | |
882 | goto out_sock_put; | |
883 | ||
884 | /* | |
885 | * Remove the facilities | |
886 | */ | |
887 | skb_pull(skb, len); | |
888 | ||
889 | skb->sk = make; | |
890 | make->sk_state = TCP_ESTABLISHED; | |
891 | ||
892 | makex25 = x25_sk(make); | |
893 | makex25->lci = lci; | |
894 | makex25->dest_addr = dest_addr; | |
895 | makex25->source_addr = source_addr; | |
896 | makex25->neighbour = nb; | |
897 | makex25->facilities = facilities; | |
898 | makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; | |
cb65d506 SP |
899 | /* ensure no reverse facil on accept */ |
900 | makex25->vc_facil_mask &= ~X25_MASK_REVERSE; | |
901 | makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; | |
1da177e4 LT |
902 | |
903 | x25_write_internal(make, X25_CALL_ACCEPTED); | |
904 | ||
905 | makex25->state = X25_STATE_3; | |
906 | ||
cb65d506 SP |
907 | /* |
908 | * Incoming Call User Data. | |
909 | */ | |
910 | if (skb->len >= 0) { | |
911 | memcpy(makex25->calluserdata.cuddata, skb->data, skb->len); | |
912 | makex25->calluserdata.cudlength = skb->len; | |
913 | } | |
914 | ||
1da177e4 LT |
915 | sk->sk_ack_backlog++; |
916 | ||
917 | x25_insert_socket(make); | |
918 | ||
919 | skb_queue_head(&sk->sk_receive_queue, skb); | |
920 | ||
921 | x25_start_heartbeat(make); | |
922 | ||
923 | if (!sock_flag(sk, SOCK_DEAD)) | |
924 | sk->sk_data_ready(sk, skb->len); | |
925 | rc = 1; | |
926 | sock_put(sk); | |
927 | out: | |
928 | return rc; | |
929 | out_sock_put: | |
930 | sock_put(sk); | |
931 | out_clear_request: | |
932 | rc = 0; | |
933 | x25_transmit_clear_request(nb, lci, 0x01); | |
934 | goto out; | |
935 | } | |
936 | ||
937 | static int x25_sendmsg(struct kiocb *iocb, struct socket *sock, | |
938 | struct msghdr *msg, size_t len) | |
939 | { | |
940 | struct sock *sk = sock->sk; | |
941 | struct x25_sock *x25 = x25_sk(sk); | |
942 | struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name; | |
943 | struct sockaddr_x25 sx25; | |
944 | struct sk_buff *skb; | |
945 | unsigned char *asmptr; | |
946 | int noblock = msg->msg_flags & MSG_DONTWAIT; | |
947 | size_t size; | |
948 | int qbit = 0, rc = -EINVAL; | |
949 | ||
950 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) | |
951 | goto out; | |
952 | ||
953 | /* we currently don't support segmented records at the user interface */ | |
954 | if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) | |
955 | goto out; | |
956 | ||
957 | rc = -EADDRNOTAVAIL; | |
958 | if (sock_flag(sk, SOCK_ZAPPED)) | |
959 | goto out; | |
960 | ||
961 | rc = -EPIPE; | |
962 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
963 | send_sig(SIGPIPE, current, 0); | |
964 | goto out; | |
965 | } | |
966 | ||
967 | rc = -ENETUNREACH; | |
968 | if (!x25->neighbour) | |
969 | goto out; | |
970 | ||
971 | if (usx25) { | |
972 | rc = -EINVAL; | |
973 | if (msg->msg_namelen < sizeof(sx25)) | |
974 | goto out; | |
975 | memcpy(&sx25, usx25, sizeof(sx25)); | |
976 | rc = -EISCONN; | |
977 | if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) | |
978 | goto out; | |
979 | rc = -EINVAL; | |
980 | if (sx25.sx25_family != AF_X25) | |
981 | goto out; | |
982 | } else { | |
983 | /* | |
984 | * FIXME 1003.1g - if the socket is like this because | |
985 | * it has become closed (not started closed) we ought | |
986 | * to SIGPIPE, EPIPE; | |
987 | */ | |
988 | rc = -ENOTCONN; | |
989 | if (sk->sk_state != TCP_ESTABLISHED) | |
990 | goto out; | |
991 | ||
992 | sx25.sx25_family = AF_X25; | |
993 | sx25.sx25_addr = x25->dest_addr; | |
994 | } | |
995 | ||
996 | SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); | |
997 | ||
998 | /* Build a packet */ | |
999 | SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); | |
1000 | ||
1001 | if ((msg->msg_flags & MSG_OOB) && len > 32) | |
1002 | len = 32; | |
1003 | ||
1004 | size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; | |
1005 | ||
1006 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
1007 | if (!skb) | |
1008 | goto out; | |
1009 | X25_SKB_CB(skb)->flags = msg->msg_flags; | |
1010 | ||
1011 | skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); | |
1012 | ||
1013 | /* | |
1014 | * Put the data on the end | |
1015 | */ | |
1016 | SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); | |
1017 | ||
1018 | asmptr = skb->h.raw = skb_put(skb, len); | |
1019 | ||
1020 | rc = memcpy_fromiovec(asmptr, msg->msg_iov, len); | |
1021 | if (rc) | |
1022 | goto out_kfree_skb; | |
1023 | ||
1024 | /* | |
1025 | * If the Q BIT Include socket option is in force, the first | |
1026 | * byte of the user data is the logical value of the Q Bit. | |
1027 | */ | |
1028 | if (x25->qbitincl) { | |
1029 | qbit = skb->data[0]; | |
1030 | skb_pull(skb, 1); | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * Push down the X.25 header | |
1035 | */ | |
1036 | SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); | |
1037 | ||
1038 | if (msg->msg_flags & MSG_OOB) { | |
1039 | if (x25->neighbour->extended) { | |
1040 | asmptr = skb_push(skb, X25_STD_MIN_LEN); | |
1041 | *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; | |
1042 | *asmptr++ = (x25->lci >> 0) & 0xFF; | |
1043 | *asmptr++ = X25_INTERRUPT; | |
1044 | } else { | |
1045 | asmptr = skb_push(skb, X25_STD_MIN_LEN); | |
1046 | *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; | |
1047 | *asmptr++ = (x25->lci >> 0) & 0xFF; | |
1048 | *asmptr++ = X25_INTERRUPT; | |
1049 | } | |
1050 | } else { | |
1051 | if (x25->neighbour->extended) { | |
1052 | /* Build an Extended X.25 header */ | |
1053 | asmptr = skb_push(skb, X25_EXT_MIN_LEN); | |
1054 | *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; | |
1055 | *asmptr++ = (x25->lci >> 0) & 0xFF; | |
1056 | *asmptr++ = X25_DATA; | |
1057 | *asmptr++ = X25_DATA; | |
1058 | } else { | |
1059 | /* Build an Standard X.25 header */ | |
1060 | asmptr = skb_push(skb, X25_STD_MIN_LEN); | |
1061 | *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; | |
1062 | *asmptr++ = (x25->lci >> 0) & 0xFF; | |
1063 | *asmptr++ = X25_DATA; | |
1064 | } | |
1065 | ||
1066 | if (qbit) | |
1067 | skb->data[0] |= X25_Q_BIT; | |
1068 | } | |
1069 | ||
1070 | SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); | |
1071 | SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); | |
1072 | ||
1073 | rc = -ENOTCONN; | |
1074 | if (sk->sk_state != TCP_ESTABLISHED) | |
1075 | goto out_kfree_skb; | |
1076 | ||
1077 | if (msg->msg_flags & MSG_OOB) | |
1078 | skb_queue_tail(&x25->interrupt_out_queue, skb); | |
1079 | else { | |
1080 | len = x25_output(sk, skb); | |
1081 | if (len < 0) | |
1082 | kfree_skb(skb); | |
1083 | else if (x25->qbitincl) | |
1084 | len++; | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * lock_sock() is currently only used to serialize this x25_kick() | |
1089 | * against input-driven x25_kick() calls. It currently only blocks | |
1090 | * incoming packets for this socket and does not protect against | |
1091 | * any other socket state changes and is not called from anywhere | |
1092 | * else. As x25_kick() cannot block and as long as all socket | |
1093 | * operations are BKL-wrapped, we don't need take to care about | |
1094 | * purging the backlog queue in x25_release(). | |
1095 | * | |
1096 | * Using lock_sock() to protect all socket operations entirely | |
1097 | * (and making the whole x25 stack SMP aware) unfortunately would | |
1098 | * require major changes to {send,recv}msg and skb allocation methods. | |
1099 | * -> 2.5 ;) | |
1100 | */ | |
1101 | lock_sock(sk); | |
1102 | x25_kick(sk); | |
1103 | release_sock(sk); | |
1104 | rc = len; | |
1105 | out: | |
1106 | return rc; | |
1107 | out_kfree_skb: | |
1108 | kfree_skb(skb); | |
1109 | goto out; | |
1110 | } | |
1111 | ||
1112 | ||
1113 | static int x25_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1114 | struct msghdr *msg, size_t size, | |
1115 | int flags) | |
1116 | { | |
1117 | struct sock *sk = sock->sk; | |
1118 | struct x25_sock *x25 = x25_sk(sk); | |
1119 | struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name; | |
1120 | size_t copied; | |
1121 | int qbit; | |
1122 | struct sk_buff *skb; | |
1123 | unsigned char *asmptr; | |
1124 | int rc = -ENOTCONN; | |
1125 | ||
1126 | /* | |
1127 | * This works for seqpacket too. The receiver has ordered the queue for | |
1128 | * us! We do one quick check first though | |
1129 | */ | |
1130 | if (sk->sk_state != TCP_ESTABLISHED) | |
1131 | goto out; | |
1132 | ||
1133 | if (flags & MSG_OOB) { | |
1134 | rc = -EINVAL; | |
1135 | if (sock_flag(sk, SOCK_URGINLINE) || | |
1136 | !skb_peek(&x25->interrupt_in_queue)) | |
1137 | goto out; | |
1138 | ||
1139 | skb = skb_dequeue(&x25->interrupt_in_queue); | |
1140 | ||
1141 | skb_pull(skb, X25_STD_MIN_LEN); | |
1142 | ||
1143 | /* | |
1144 | * No Q bit information on Interrupt data. | |
1145 | */ | |
1146 | if (x25->qbitincl) { | |
1147 | asmptr = skb_push(skb, 1); | |
1148 | *asmptr = 0x00; | |
1149 | } | |
1150 | ||
1151 | msg->msg_flags |= MSG_OOB; | |
1152 | } else { | |
1153 | /* Now we can treat all alike */ | |
1154 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
1155 | flags & MSG_DONTWAIT, &rc); | |
1156 | if (!skb) | |
1157 | goto out; | |
1158 | ||
1159 | qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; | |
1160 | ||
1161 | skb_pull(skb, x25->neighbour->extended ? | |
1162 | X25_EXT_MIN_LEN : X25_STD_MIN_LEN); | |
1163 | ||
1164 | if (x25->qbitincl) { | |
1165 | asmptr = skb_push(skb, 1); | |
1166 | *asmptr = qbit; | |
1167 | } | |
1168 | } | |
1169 | ||
1170 | skb->h.raw = skb->data; | |
1171 | ||
1172 | copied = skb->len; | |
1173 | ||
1174 | if (copied > size) { | |
1175 | copied = size; | |
1176 | msg->msg_flags |= MSG_TRUNC; | |
1177 | } | |
1178 | ||
1179 | /* Currently, each datagram always contains a complete record */ | |
1180 | msg->msg_flags |= MSG_EOR; | |
1181 | ||
1182 | rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1183 | if (rc) | |
1184 | goto out_free_dgram; | |
1185 | ||
1186 | if (sx25) { | |
1187 | sx25->sx25_family = AF_X25; | |
1188 | sx25->sx25_addr = x25->dest_addr; | |
1189 | } | |
1190 | ||
1191 | msg->msg_namelen = sizeof(struct sockaddr_x25); | |
1192 | ||
1193 | lock_sock(sk); | |
1194 | x25_check_rbuf(sk); | |
1195 | release_sock(sk); | |
1196 | rc = copied; | |
1197 | out_free_dgram: | |
1198 | skb_free_datagram(sk, skb); | |
1199 | out: | |
1200 | return rc; | |
1201 | } | |
1202 | ||
1203 | ||
1204 | static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1205 | { | |
1206 | struct sock *sk = sock->sk; | |
1207 | struct x25_sock *x25 = x25_sk(sk); | |
1208 | void __user *argp = (void __user *)arg; | |
1209 | int rc; | |
1210 | ||
1211 | switch (cmd) { | |
1212 | case TIOCOUTQ: { | |
1213 | int amount = sk->sk_sndbuf - | |
1214 | atomic_read(&sk->sk_wmem_alloc); | |
1215 | if (amount < 0) | |
1216 | amount = 0; | |
1217 | rc = put_user(amount, (unsigned int __user *)argp); | |
1218 | break; | |
1219 | } | |
1220 | ||
1221 | case TIOCINQ: { | |
1222 | struct sk_buff *skb; | |
1223 | int amount = 0; | |
1224 | /* | |
1225 | * These two are safe on a single CPU system as | |
1226 | * only user tasks fiddle here | |
1227 | */ | |
1228 | if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) | |
1229 | amount = skb->len; | |
1230 | rc = put_user(amount, (unsigned int __user *)argp); | |
1231 | break; | |
1232 | } | |
1233 | ||
1234 | case SIOCGSTAMP: | |
1235 | rc = -EINVAL; | |
1236 | if (sk) | |
1237 | rc = sock_get_timestamp(sk, | |
1238 | (struct timeval __user *)argp); | |
1239 | break; | |
1240 | case SIOCGIFADDR: | |
1241 | case SIOCSIFADDR: | |
1242 | case SIOCGIFDSTADDR: | |
1243 | case SIOCSIFDSTADDR: | |
1244 | case SIOCGIFBRDADDR: | |
1245 | case SIOCSIFBRDADDR: | |
1246 | case SIOCGIFNETMASK: | |
1247 | case SIOCSIFNETMASK: | |
1248 | case SIOCGIFMETRIC: | |
1249 | case SIOCSIFMETRIC: | |
1250 | rc = -EINVAL; | |
1251 | break; | |
1252 | case SIOCADDRT: | |
1253 | case SIOCDELRT: | |
1254 | rc = -EPERM; | |
1255 | if (!capable(CAP_NET_ADMIN)) | |
1256 | break; | |
1257 | rc = x25_route_ioctl(cmd, argp); | |
1258 | break; | |
1259 | case SIOCX25GSUBSCRIP: | |
1260 | rc = x25_subscr_ioctl(cmd, argp); | |
1261 | break; | |
1262 | case SIOCX25SSUBSCRIP: | |
1263 | rc = -EPERM; | |
1264 | if (!capable(CAP_NET_ADMIN)) | |
1265 | break; | |
1266 | rc = x25_subscr_ioctl(cmd, argp); | |
1267 | break; | |
1268 | case SIOCX25GFACILITIES: { | |
1269 | struct x25_facilities fac = x25->facilities; | |
1270 | rc = copy_to_user(argp, &fac, | |
1271 | sizeof(fac)) ? -EFAULT : 0; | |
1272 | break; | |
1273 | } | |
1274 | ||
1275 | case SIOCX25SFACILITIES: { | |
1276 | struct x25_facilities facilities; | |
1277 | rc = -EFAULT; | |
1278 | if (copy_from_user(&facilities, argp, | |
1279 | sizeof(facilities))) | |
1280 | break; | |
1281 | rc = -EINVAL; | |
1282 | if (sk->sk_state != TCP_LISTEN && | |
1283 | sk->sk_state != TCP_CLOSE) | |
1284 | break; | |
1285 | if (facilities.pacsize_in < X25_PS16 || | |
1286 | facilities.pacsize_in > X25_PS4096) | |
1287 | break; | |
1288 | if (facilities.pacsize_out < X25_PS16 || | |
1289 | facilities.pacsize_out > X25_PS4096) | |
1290 | break; | |
1291 | if (facilities.winsize_in < 1 || | |
1292 | facilities.winsize_in > 127) | |
1293 | break; | |
1294 | if (facilities.throughput < 0x03 || | |
1295 | facilities.throughput > 0xDD) | |
1296 | break; | |
1297 | if (facilities.reverse && facilities.reverse != 1) | |
1298 | break; | |
1299 | x25->facilities = facilities; | |
1300 | rc = 0; | |
1301 | break; | |
1302 | } | |
1303 | ||
1304 | case SIOCX25GCALLUSERDATA: { | |
1305 | struct x25_calluserdata cud = x25->calluserdata; | |
1306 | rc = copy_to_user(argp, &cud, | |
1307 | sizeof(cud)) ? -EFAULT : 0; | |
1308 | break; | |
1309 | } | |
1310 | ||
1311 | case SIOCX25SCALLUSERDATA: { | |
1312 | struct x25_calluserdata calluserdata; | |
1313 | ||
1314 | rc = -EFAULT; | |
1315 | if (copy_from_user(&calluserdata, argp, | |
1316 | sizeof(calluserdata))) | |
1317 | break; | |
1318 | rc = -EINVAL; | |
1319 | if (calluserdata.cudlength > X25_MAX_CUD_LEN) | |
1320 | break; | |
1321 | x25->calluserdata = calluserdata; | |
1322 | rc = 0; | |
1323 | break; | |
1324 | } | |
1325 | ||
1326 | case SIOCX25GCAUSEDIAG: { | |
1327 | struct x25_causediag causediag; | |
1328 | causediag = x25->causediag; | |
1329 | rc = copy_to_user(argp, &causediag, | |
1330 | sizeof(causediag)) ? -EFAULT : 0; | |
1331 | break; | |
1332 | } | |
1333 | ||
cb65d506 SP |
1334 | case SIOCX25SCUDMATCHLEN: { |
1335 | struct x25_subaddr sub_addr; | |
1336 | rc = -EINVAL; | |
1337 | if(sk->sk_state != TCP_CLOSE) | |
1338 | break; | |
1339 | rc = -EFAULT; | |
1340 | if (copy_from_user(&sub_addr, argp, | |
1341 | sizeof(sub_addr))) | |
1342 | break; | |
1343 | rc = -EINVAL; | |
1344 | if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN) | |
1345 | break; | |
1346 | x25->cudmatchlength = sub_addr.cudmatchlength; | |
1347 | rc = 0; | |
1348 | break; | |
1349 | } | |
1350 | ||
1da177e4 LT |
1351 | default: |
1352 | rc = dev_ioctl(cmd, argp); | |
1353 | break; | |
1354 | } | |
1355 | ||
1356 | return rc; | |
1357 | } | |
1358 | ||
1359 | static struct net_proto_family x25_family_ops = { | |
1360 | .family = AF_X25, | |
1361 | .create = x25_create, | |
1362 | .owner = THIS_MODULE, | |
1363 | }; | |
1364 | ||
1365 | static struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = { | |
1366 | .family = AF_X25, | |
1367 | .owner = THIS_MODULE, | |
1368 | .release = x25_release, | |
1369 | .bind = x25_bind, | |
1370 | .connect = x25_connect, | |
1371 | .socketpair = sock_no_socketpair, | |
1372 | .accept = x25_accept, | |
1373 | .getname = x25_getname, | |
1374 | .poll = datagram_poll, | |
1375 | .ioctl = x25_ioctl, | |
1376 | .listen = x25_listen, | |
1377 | .shutdown = sock_no_shutdown, | |
1378 | .setsockopt = x25_setsockopt, | |
1379 | .getsockopt = x25_getsockopt, | |
1380 | .sendmsg = x25_sendmsg, | |
1381 | .recvmsg = x25_recvmsg, | |
1382 | .mmap = sock_no_mmap, | |
1383 | .sendpage = sock_no_sendpage, | |
1384 | }; | |
1385 | ||
1386 | #include <linux/smp_lock.h> | |
1387 | SOCKOPS_WRAP(x25_proto, AF_X25); | |
1388 | ||
1389 | static struct packet_type x25_packet_type = { | |
1390 | .type = __constant_htons(ETH_P_X25), | |
1391 | .func = x25_lapb_receive_frame, | |
1392 | }; | |
1393 | ||
1394 | static struct notifier_block x25_dev_notifier = { | |
1395 | .notifier_call = x25_device_event, | |
1396 | }; | |
1397 | ||
1398 | void x25_kill_by_neigh(struct x25_neigh *nb) | |
1399 | { | |
1400 | struct sock *s; | |
1401 | struct hlist_node *node; | |
1402 | ||
1403 | write_lock_bh(&x25_list_lock); | |
1404 | ||
1405 | sk_for_each(s, node, &x25_list) | |
1406 | if (x25_sk(s)->neighbour == nb) | |
1407 | x25_disconnect(s, ENETUNREACH, 0, 0); | |
1408 | ||
1409 | write_unlock_bh(&x25_list_lock); | |
1410 | } | |
1411 | ||
1412 | static int __init x25_init(void) | |
1413 | { | |
1414 | int rc = proto_register(&x25_proto, 0); | |
1415 | ||
1416 | if (rc != 0) | |
1417 | goto out; | |
1418 | ||
1419 | sock_register(&x25_family_ops); | |
1420 | ||
1421 | dev_add_pack(&x25_packet_type); | |
1422 | ||
1423 | register_netdevice_notifier(&x25_dev_notifier); | |
1424 | ||
1425 | printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n"); | |
1426 | ||
1427 | #ifdef CONFIG_SYSCTL | |
1428 | x25_register_sysctl(); | |
1429 | #endif | |
1430 | x25_proc_init(); | |
1431 | out: | |
1432 | return rc; | |
1433 | } | |
1434 | module_init(x25_init); | |
1435 | ||
1436 | static void __exit x25_exit(void) | |
1437 | { | |
1438 | x25_proc_exit(); | |
1439 | x25_link_free(); | |
1440 | x25_route_free(); | |
1441 | ||
1442 | #ifdef CONFIG_SYSCTL | |
1443 | x25_unregister_sysctl(); | |
1444 | #endif | |
1445 | ||
1446 | unregister_netdevice_notifier(&x25_dev_notifier); | |
1447 | ||
1448 | dev_remove_pack(&x25_packet_type); | |
1449 | ||
1450 | sock_unregister(AF_X25); | |
1451 | proto_unregister(&x25_proto); | |
1452 | } | |
1453 | module_exit(x25_exit); | |
1454 | ||
1455 | MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); | |
1456 | MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); | |
1457 | MODULE_LICENSE("GPL"); | |
1458 | MODULE_ALIAS_NETPROTO(PF_X25); |