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Commit | Line | Data |
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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 | |
32 | * 2005-04-02 Shaun Pereira Selective sub address matching | |
33 | * with call user data | |
34 | * 2005-04-15 Shaun Pereira Fast select with no restriction on | |
35 | * response | |
36 | */ | |
37 | ||
38 | #include <linux/config.h> | |
39 | #include <linux/module.h> | |
40 | #include <linux/errno.h> | |
41 | #include <linux/kernel.h> | |
42 | #include <linux/sched.h> | |
43 | #include <linux/timer.h> | |
44 | #include <linux/string.h> | |
45 | #include <linux/net.h> | |
46 | #include <linux/netdevice.h> | |
47 | #include <linux/if_arp.h> | |
48 | #include <linux/skbuff.h> | |
49 | #include <net/sock.h> | |
50 | #include <net/tcp.h> | |
51 | #include <asm/uaccess.h> | |
52 | #include <linux/fcntl.h> | |
53 | #include <linux/termios.h> /* For TIOCINQ/OUTQ */ | |
54 | #include <linux/notifier.h> | |
55 | #include <linux/init.h> | |
56 | #include <net/x25.h> | |
57 | ||
58 | int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; | |
59 | int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; | |
60 | int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; | |
61 | int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; | |
62 | int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; | |
63 | ||
64 | HLIST_HEAD(x25_list); | |
65 | DEFINE_RWLOCK(x25_list_lock); | |
66 | ||
67 | static struct proto_ops x25_proto_ops; | |
68 | ||
69 | static struct x25_address null_x25_address = {" "}; | |
70 | ||
71 | int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, | |
72 | struct x25_address *calling_addr) | |
73 | { | |
74 | int called_len, calling_len; | |
75 | char *called, *calling; | |
76 | int i; | |
77 | ||
78 | called_len = (*p >> 0) & 0x0F; | |
79 | calling_len = (*p >> 4) & 0x0F; | |
80 | ||
81 | called = called_addr->x25_addr; | |
82 | calling = calling_addr->x25_addr; | |
83 | p++; | |
84 | ||
85 | for (i = 0; i < (called_len + calling_len); i++) { | |
86 | if (i < called_len) { | |
87 | if (i % 2 != 0) { | |
88 | *called++ = ((*p >> 0) & 0x0F) + '0'; | |
89 | p++; | |
90 | } else { | |
91 | *called++ = ((*p >> 4) & 0x0F) + '0'; | |
92 | } | |
93 | } else { | |
94 | if (i % 2 != 0) { | |
95 | *calling++ = ((*p >> 0) & 0x0F) + '0'; | |
96 | p++; | |
97 | } else { | |
98 | *calling++ = ((*p >> 4) & 0x0F) + '0'; | |
99 | } | |
100 | } | |
101 | } | |
102 | ||
103 | *called = *calling = '\0'; | |
104 | ||
105 | return 1 + (called_len + calling_len + 1) / 2; | |
106 | } | |
107 | ||
108 | int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, | |
109 | struct x25_address *calling_addr) | |
110 | { | |
111 | unsigned int called_len, calling_len; | |
112 | char *called, *calling; | |
113 | int i; | |
114 | ||
115 | called = called_addr->x25_addr; | |
116 | calling = calling_addr->x25_addr; | |
117 | ||
118 | called_len = strlen(called); | |
119 | calling_len = strlen(calling); | |
120 | ||
121 | *p++ = (calling_len << 4) | (called_len << 0); | |
122 | ||
123 | for (i = 0; i < (called_len + calling_len); i++) { | |
124 | if (i < called_len) { | |
125 | if (i % 2 != 0) { | |
126 | *p |= (*called++ - '0') << 0; | |
127 | p++; | |
128 | } else { | |
129 | *p = 0x00; | |
130 | *p |= (*called++ - '0') << 4; | |
131 | } | |
132 | } else { | |
133 | if (i % 2 != 0) { | |
134 | *p |= (*calling++ - '0') << 0; | |
135 | p++; | |
136 | } else { | |
137 | *p = 0x00; | |
138 | *p |= (*calling++ - '0') << 4; | |
139 | } | |
140 | } | |
141 | } | |
142 | ||
143 | return 1 + (called_len + calling_len + 1) / 2; | |
144 | } | |
145 | ||
146 | /* | |
147 | * Socket removal during an interrupt is now safe. | |
148 | */ | |
149 | static void x25_remove_socket(struct sock *sk) | |
150 | { | |
151 | write_lock_bh(&x25_list_lock); | |
152 | sk_del_node_init(sk); | |
153 | write_unlock_bh(&x25_list_lock); | |
154 | } | |
155 | ||
156 | /* | |
157 | * Kill all bound sockets on a dropped device. | |
158 | */ | |
159 | static void x25_kill_by_device(struct net_device *dev) | |
160 | { | |
161 | struct sock *s; | |
162 | struct hlist_node *node; | |
163 | ||
164 | write_lock_bh(&x25_list_lock); | |
165 | ||
166 | sk_for_each(s, node, &x25_list) | |
167 | if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev) | |
168 | x25_disconnect(s, ENETUNREACH, 0, 0); | |
169 | ||
170 | write_unlock_bh(&x25_list_lock); | |
171 | } | |
172 | ||
173 | /* | |
174 | * Handle device status changes. | |
175 | */ | |
176 | static int x25_device_event(struct notifier_block *this, unsigned long event, | |
177 | void *ptr) | |
178 | { | |
179 | struct net_device *dev = ptr; | |
180 | struct x25_neigh *nb; | |
181 | ||
182 | if (dev->type == ARPHRD_X25 | |
183 | #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE) | |
184 | || dev->type == ARPHRD_ETHER | |
185 | #endif | |
186 | ) { | |
187 | switch (event) { | |
188 | case NETDEV_UP: | |
189 | x25_link_device_up(dev); | |
190 | break; | |
191 | case NETDEV_GOING_DOWN: | |
192 | nb = x25_get_neigh(dev); | |
193 | if (nb) { | |
194 | x25_terminate_link(nb); | |
195 | x25_neigh_put(nb); | |
196 | } | |
197 | break; | |
198 | case NETDEV_DOWN: | |
199 | x25_kill_by_device(dev); | |
200 | x25_route_device_down(dev); | |
201 | x25_link_device_down(dev); | |
202 | break; | |
203 | } | |
204 | } | |
205 | ||
206 | return NOTIFY_DONE; | |
207 | } | |
208 | ||
209 | /* | |
210 | * Add a socket to the bound sockets list. | |
211 | */ | |
212 | static void x25_insert_socket(struct sock *sk) | |
213 | { | |
214 | write_lock_bh(&x25_list_lock); | |
215 | sk_add_node(sk, &x25_list); | |
216 | write_unlock_bh(&x25_list_lock); | |
217 | } | |
218 | ||
219 | /* | |
220 | * Find a socket that wants to accept the Call Request we just | |
221 | * received. Check the full list for an address/cud match. | |
222 | * If no cuds match return the next_best thing, an address match. | |
223 | * Note: if a listening socket has cud set it must only get calls | |
224 | * with matching cud. | |
225 | */ | |
226 | static struct sock *x25_find_listener(struct x25_address *addr, | |
227 | struct sk_buff *skb) | |
228 | { | |
229 | struct sock *s; | |
230 | struct sock *next_best; | |
231 | struct hlist_node *node; | |
232 | ||
233 | read_lock_bh(&x25_list_lock); | |
234 | next_best = NULL; | |
235 | ||
236 | sk_for_each(s, node, &x25_list) | |
237 | if ((!strcmp(addr->x25_addr, | |
238 | x25_sk(s)->source_addr.x25_addr) || | |
239 | !strcmp(addr->x25_addr, | |
240 | null_x25_address.x25_addr)) && | |
241 | s->sk_state == TCP_LISTEN) { | |
242 | /* | |
243 | * Found a listening socket, now check the incoming | |
244 | * call user data vs this sockets call user data | |
245 | */ | |
246 | if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) { | |
247 | if((memcmp(x25_sk(s)->calluserdata.cuddata, | |
248 | skb->data, | |
249 | x25_sk(s)->cudmatchlength)) == 0) { | |
250 | sock_hold(s); | |
251 | goto found; | |
252 | } | |
253 | } else | |
254 | next_best = s; | |
255 | } | |
256 | if (next_best) { | |
257 | s = next_best; | |
258 | sock_hold(s); | |
259 | goto found; | |
260 | } | |
261 | s = NULL; | |
262 | found: | |
263 | read_unlock_bh(&x25_list_lock); | |
264 | return s; | |
265 | } | |
266 | ||
267 | /* | |
268 | * Find a connected X.25 socket given my LCI and neighbour. | |
269 | */ | |
270 | static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) | |
271 | { | |
272 | struct sock *s; | |
273 | struct hlist_node *node; | |
274 | ||
275 | sk_for_each(s, node, &x25_list) | |
276 | if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { | |
277 | sock_hold(s); | |
278 | goto found; | |
279 | } | |
280 | s = NULL; | |
281 | found: | |
282 | return s; | |
283 | } | |
284 | ||
285 | struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) | |
286 | { | |
287 | struct sock *s; | |
288 | ||
289 | read_lock_bh(&x25_list_lock); | |
290 | s = __x25_find_socket(lci, nb); | |
291 | read_unlock_bh(&x25_list_lock); | |
292 | return s; | |
293 | } | |
294 | ||
295 | /* | |
296 | * Find a unique LCI for a given device. | |
297 | */ | |
298 | static unsigned int x25_new_lci(struct x25_neigh *nb) | |
299 | { | |
300 | unsigned int lci = 1; | |
301 | struct sock *sk; | |
302 | ||
303 | read_lock_bh(&x25_list_lock); | |
304 | ||
305 | while ((sk = __x25_find_socket(lci, nb)) != NULL) { | |
306 | sock_put(sk); | |
307 | if (++lci == 4096) { | |
308 | lci = 0; | |
309 | break; | |
310 | } | |
311 | } | |
312 | ||
313 | read_unlock_bh(&x25_list_lock); | |
314 | return lci; | |
315 | } | |
316 | ||
317 | /* | |
318 | * Deferred destroy. | |
319 | */ | |
320 | void x25_destroy_socket(struct sock *); | |
321 | ||
322 | /* | |
323 | * handler for deferred kills. | |
324 | */ | |
325 | static void x25_destroy_timer(unsigned long data) | |
326 | { | |
327 | x25_destroy_socket((struct sock *)data); | |
328 | } | |
329 | ||
330 | /* | |
331 | * This is called from user mode and the timers. Thus it protects itself | |
332 | * against interrupt users but doesn't worry about being called during | |
333 | * work. Once it is removed from the queue no interrupt or bottom half | |
334 | * will touch it and we are (fairly 8-) ) safe. | |
335 | * Not static as it's used by the timer | |
336 | */ | |
337 | void x25_destroy_socket(struct sock *sk) | |
338 | { | |
339 | struct sk_buff *skb; | |
340 | ||
341 | sock_hold(sk); | |
342 | lock_sock(sk); | |
343 | x25_stop_heartbeat(sk); | |
344 | x25_stop_timer(sk); | |
345 | ||
346 | x25_remove_socket(sk); | |
347 | x25_clear_queues(sk); /* Flush the queues */ | |
348 | ||
349 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
350 | if (skb->sk != sk) { /* A pending connection */ | |
351 | /* | |
352 | * Queue the unaccepted socket for death | |
353 | */ | |
354 | sock_set_flag(skb->sk, SOCK_DEAD); | |
355 | x25_start_heartbeat(skb->sk); | |
356 | x25_sk(skb->sk)->state = X25_STATE_0; | |
357 | } | |
358 | ||
359 | kfree_skb(skb); | |
360 | } | |
361 | ||
362 | if (atomic_read(&sk->sk_wmem_alloc) || | |
363 | atomic_read(&sk->sk_rmem_alloc)) { | |
364 | /* Defer: outstanding buffers */ | |
365 | sk->sk_timer.expires = jiffies + 10 * HZ; | |
366 | sk->sk_timer.function = x25_destroy_timer; | |
367 | sk->sk_timer.data = (unsigned long)sk; | |
368 | add_timer(&sk->sk_timer); | |
369 | } else { | |
370 | /* drop last reference so sock_put will free */ | |
371 | __sock_put(sk); | |
372 | } | |
373 | ||
374 | release_sock(sk); | |
375 | sock_put(sk); | |
376 | } | |
377 | ||
378 | /* | |
379 | * Handling for system calls applied via the various interfaces to a | |
380 | * X.25 socket object. | |
381 | */ | |
382 | ||
383 | static int x25_setsockopt(struct socket *sock, int level, int optname, | |
384 | char __user *optval, int optlen) | |
385 | { | |
386 | int opt; | |
387 | struct sock *sk = sock->sk; | |
388 | int rc = -ENOPROTOOPT; | |
389 | ||
390 | if (level != SOL_X25 || optname != X25_QBITINCL) | |
391 | goto out; | |
392 | ||
393 | rc = -EINVAL; | |
394 | if (optlen < sizeof(int)) | |
395 | goto out; | |
396 | ||
397 | rc = -EFAULT; | |
398 | if (get_user(opt, (int __user *)optval)) | |
399 | goto out; | |
400 | ||
401 | x25_sk(sk)->qbitincl = !!opt; | |
402 | rc = 0; | |
403 | out: | |
404 | return rc; | |
405 | } | |
406 | ||
407 | static int x25_getsockopt(struct socket *sock, int level, int optname, | |
408 | char __user *optval, int __user *optlen) | |
409 | { | |
410 | struct sock *sk = sock->sk; | |
411 | int val, len, rc = -ENOPROTOOPT; | |
412 | ||
413 | if (level != SOL_X25 || optname != X25_QBITINCL) | |
414 | goto out; | |
415 | ||
416 | rc = -EFAULT; | |
417 | if (get_user(len, optlen)) | |
418 | goto out; | |
419 | ||
420 | len = min_t(unsigned int, len, sizeof(int)); | |
421 | ||
422 | rc = -EINVAL; | |
423 | if (len < 0) | |
424 | goto out; | |
425 | ||
426 | rc = -EFAULT; | |
427 | if (put_user(len, optlen)) | |
428 | goto out; | |
429 | ||
430 | val = x25_sk(sk)->qbitincl; | |
431 | rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; | |
432 | out: | |
433 | return rc; | |
434 | } | |
435 | ||
436 | static int x25_listen(struct socket *sock, int backlog) | |
437 | { | |
438 | struct sock *sk = sock->sk; | |
439 | int rc = -EOPNOTSUPP; | |
440 | ||
441 | if (sk->sk_state != TCP_LISTEN) { | |
442 | memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); | |
443 | sk->sk_max_ack_backlog = backlog; | |
444 | sk->sk_state = TCP_LISTEN; | |
445 | rc = 0; | |
446 | } | |
447 | ||
448 | return rc; | |
449 | } | |
450 | ||
451 | static struct proto x25_proto = { | |
452 | .name = "X25", | |
453 | .owner = THIS_MODULE, | |
454 | .obj_size = sizeof(struct x25_sock), | |
455 | }; | |
456 | ||
457 | static struct sock *x25_alloc_socket(void) | |
458 | { | |
459 | struct x25_sock *x25; | |
460 | struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, &x25_proto, 1); | |
461 | ||
462 | if (!sk) | |
463 | goto out; | |
464 | ||
465 | sock_init_data(NULL, sk); | |
466 | ||
467 | x25 = x25_sk(sk); | |
468 | skb_queue_head_init(&x25->ack_queue); | |
469 | skb_queue_head_init(&x25->fragment_queue); | |
470 | skb_queue_head_init(&x25->interrupt_in_queue); | |
471 | skb_queue_head_init(&x25->interrupt_out_queue); | |
472 | out: | |
473 | return sk; | |
474 | } | |
475 | ||
476 | void x25_init_timers(struct sock *sk); | |
477 | ||
478 | static int x25_create(struct socket *sock, int protocol) | |
479 | { | |
480 | struct sock *sk; | |
481 | struct x25_sock *x25; | |
482 | int rc = -ESOCKTNOSUPPORT; | |
483 | ||
484 | if (sock->type != SOCK_SEQPACKET || protocol) | |
485 | goto out; | |
486 | ||
487 | rc = -ENOMEM; | |
488 | if ((sk = x25_alloc_socket()) == NULL) | |
489 | goto out; | |
490 | ||
491 | x25 = x25_sk(sk); | |
492 | ||
493 | sock_init_data(sock, sk); | |
494 | ||
495 | x25_init_timers(sk); | |
496 | ||
497 | sock->ops = &x25_proto_ops; | |
498 | sk->sk_protocol = protocol; | |
499 | sk->sk_backlog_rcv = x25_backlog_rcv; | |
500 | ||
501 | x25->t21 = sysctl_x25_call_request_timeout; | |
502 | x25->t22 = sysctl_x25_reset_request_timeout; | |
503 | x25->t23 = sysctl_x25_clear_request_timeout; | |
504 | x25->t2 = sysctl_x25_ack_holdback_timeout; | |
505 | x25->state = X25_STATE_0; | |
506 | x25->cudmatchlength = 0; | |
507 | x25->accptapprv = X25_DENY_ACCPT_APPRV; /* normally no cud */ | |
508 | /* on call accept */ | |
509 | ||
510 | x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; | |
511 | x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; | |
512 | x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; | |
513 | x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; | |
514 | x25->facilities.throughput = X25_DEFAULT_THROUGHPUT; | |
515 | x25->facilities.reverse = X25_DEFAULT_REVERSE; | |
516 | rc = 0; | |
517 | out: | |
518 | return rc; | |
519 | } | |
520 | ||
521 | static struct sock *x25_make_new(struct sock *osk) | |
522 | { | |
523 | struct sock *sk = NULL; | |
524 | struct x25_sock *x25, *ox25; | |
525 | ||
526 | if (osk->sk_type != SOCK_SEQPACKET) | |
527 | goto out; | |
528 | ||
529 | if ((sk = x25_alloc_socket()) == NULL) | |
530 | goto out; | |
531 | ||
532 | x25 = x25_sk(sk); | |
533 | ||
534 | sk->sk_type = osk->sk_type; | |
535 | sk->sk_socket = osk->sk_socket; | |
536 | sk->sk_priority = osk->sk_priority; | |
537 | sk->sk_protocol = osk->sk_protocol; | |
538 | sk->sk_rcvbuf = osk->sk_rcvbuf; | |
539 | sk->sk_sndbuf = osk->sk_sndbuf; | |
540 | sk->sk_state = TCP_ESTABLISHED; | |
541 | sk->sk_sleep = osk->sk_sleep; | |
542 | sk->sk_backlog_rcv = osk->sk_backlog_rcv; | |
543 | ||
544 | if (sock_flag(osk, SOCK_ZAPPED)) | |
545 | sock_set_flag(sk, SOCK_ZAPPED); | |
546 | ||
547 | if (sock_flag(osk, SOCK_DBG)) | |
548 | sock_set_flag(sk, SOCK_DBG); | |
549 | ||
550 | ox25 = x25_sk(osk); | |
551 | x25->t21 = ox25->t21; | |
552 | x25->t22 = ox25->t22; | |
553 | x25->t23 = ox25->t23; | |
554 | x25->t2 = ox25->t2; | |
555 | x25->facilities = ox25->facilities; | |
556 | x25->qbitincl = ox25->qbitincl; | |
557 | x25->cudmatchlength = ox25->cudmatchlength; | |
558 | x25->accptapprv = ox25->accptapprv; | |
559 | ||
560 | x25_init_timers(sk); | |
561 | out: | |
562 | return sk; | |
563 | } | |
564 | ||
565 | static int x25_release(struct socket *sock) | |
566 | { | |
567 | struct sock *sk = sock->sk; | |
568 | struct x25_sock *x25; | |
569 | ||
570 | if (!sk) | |
571 | goto out; | |
572 | ||
573 | x25 = x25_sk(sk); | |
574 | ||
575 | switch (x25->state) { | |
576 | ||
577 | case X25_STATE_0: | |
578 | case X25_STATE_2: | |
579 | x25_disconnect(sk, 0, 0, 0); | |
580 | x25_destroy_socket(sk); | |
581 | goto out; | |
582 | ||
583 | case X25_STATE_1: | |
584 | case X25_STATE_3: | |
585 | case X25_STATE_4: | |
586 | x25_clear_queues(sk); | |
587 | x25_write_internal(sk, X25_CLEAR_REQUEST); | |
588 | x25_start_t23timer(sk); | |
589 | x25->state = X25_STATE_2; | |
590 | sk->sk_state = TCP_CLOSE; | |
591 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
592 | sk->sk_state_change(sk); | |
593 | sock_set_flag(sk, SOCK_DEAD); | |
594 | sock_set_flag(sk, SOCK_DESTROY); | |
595 | break; | |
596 | } | |
597 | ||
598 | sock->sk = NULL; | |
599 | sk->sk_socket = NULL; /* Not used, but we should do this */ | |
600 | out: | |
601 | return 0; | |
602 | } | |
603 | ||
604 | static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
605 | { | |
606 | struct sock *sk = sock->sk; | |
607 | struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; | |
608 | ||
609 | if (!sock_flag(sk, SOCK_ZAPPED) || | |
610 | addr_len != sizeof(struct sockaddr_x25) || | |
611 | addr->sx25_family != AF_X25) | |
612 | return -EINVAL; | |
613 | ||
614 | x25_sk(sk)->source_addr = addr->sx25_addr; | |
615 | x25_insert_socket(sk); | |
616 | sock_reset_flag(sk, SOCK_ZAPPED); | |
617 | SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); | |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
622 | static int x25_wait_for_connection_establishment(struct sock *sk) | |
623 | { | |
624 | DECLARE_WAITQUEUE(wait, current); | |
625 | int rc; | |
626 | ||
627 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
628 | for (;;) { | |
629 | __set_current_state(TASK_INTERRUPTIBLE); | |
630 | rc = -ERESTARTSYS; | |
631 | if (signal_pending(current)) | |
632 | break; | |
633 | rc = sock_error(sk); | |
634 | if (rc) { | |
635 | sk->sk_socket->state = SS_UNCONNECTED; | |
636 | break; | |
637 | } | |
638 | rc = 0; | |
639 | if (sk->sk_state != TCP_ESTABLISHED) { | |
640 | release_sock(sk); | |
641 | schedule(); | |
642 | lock_sock(sk); | |
643 | } else | |
644 | break; | |
645 | } | |
646 | __set_current_state(TASK_RUNNING); | |
647 | remove_wait_queue(sk->sk_sleep, &wait); | |
648 | return rc; | |
649 | } | |
650 | ||
651 | static int x25_connect(struct socket *sock, struct sockaddr *uaddr, | |
652 | int addr_len, int flags) | |
653 | { | |
654 | struct sock *sk = sock->sk; | |
655 | struct x25_sock *x25 = x25_sk(sk); | |
656 | struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; | |
657 | struct x25_route *rt; | |
658 | int rc = 0; | |
659 | ||
660 | lock_sock(sk); | |
661 | if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { | |
662 | sock->state = SS_CONNECTED; | |
663 | goto out; /* Connect completed during a ERESTARTSYS event */ | |
664 | } | |
665 | ||
666 | rc = -ECONNREFUSED; | |
667 | if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { | |
668 | sock->state = SS_UNCONNECTED; | |
669 | goto out; | |
670 | } | |
671 | ||
672 | rc = -EISCONN; /* No reconnect on a seqpacket socket */ | |
673 | if (sk->sk_state == TCP_ESTABLISHED) | |
674 | goto out; | |
675 | ||
676 | sk->sk_state = TCP_CLOSE; | |
677 | sock->state = SS_UNCONNECTED; | |
678 | ||
679 | rc = -EINVAL; | |
680 | if (addr_len != sizeof(struct sockaddr_x25) || | |
681 | addr->sx25_family != AF_X25) | |
682 | goto out; | |
683 | ||
684 | rc = -ENETUNREACH; | |
685 | rt = x25_get_route(&addr->sx25_addr); | |
686 | if (!rt) | |
687 | goto out; | |
688 | ||
689 | x25->neighbour = x25_get_neigh(rt->dev); | |
690 | if (!x25->neighbour) | |
691 | goto out_put_route; | |
692 | ||
693 | x25_limit_facilities(&x25->facilities, x25->neighbour); | |
694 | ||
695 | x25->lci = x25_new_lci(x25->neighbour); | |
696 | if (!x25->lci) | |
697 | goto out_put_neigh; | |
698 | ||
699 | rc = -EINVAL; | |
700 | if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ | |
701 | goto out_put_neigh; | |
702 | ||
703 | if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) | |
704 | memset(&x25->source_addr, '\0', X25_ADDR_LEN); | |
705 | ||
706 | x25->dest_addr = addr->sx25_addr; | |
707 | ||
708 | /* Move to connecting socket, start sending Connect Requests */ | |
709 | sock->state = SS_CONNECTING; | |
710 | sk->sk_state = TCP_SYN_SENT; | |
711 | ||
712 | x25->state = X25_STATE_1; | |
713 | ||
714 | x25_write_internal(sk, X25_CALL_REQUEST); | |
715 | ||
716 | x25_start_heartbeat(sk); | |
717 | x25_start_t21timer(sk); | |
718 | ||
719 | /* Now the loop */ | |
720 | rc = -EINPROGRESS; | |
721 | if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) | |
722 | goto out_put_neigh; | |
723 | ||
724 | rc = x25_wait_for_connection_establishment(sk); | |
725 | if (rc) | |
726 | goto out_put_neigh; | |
727 | ||
728 | sock->state = SS_CONNECTED; | |
729 | rc = 0; | |
730 | out_put_neigh: | |
731 | if (rc) | |
732 | x25_neigh_put(x25->neighbour); | |
733 | out_put_route: | |
734 | x25_route_put(rt); | |
735 | out: | |
736 | release_sock(sk); | |
737 | return rc; | |
738 | } | |
739 | ||
740 | static int x25_wait_for_data(struct sock *sk, int timeout) | |
741 | { | |
742 | DECLARE_WAITQUEUE(wait, current); | |
743 | int rc = 0; | |
744 | ||
745 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
746 | for (;;) { | |
747 | __set_current_state(TASK_INTERRUPTIBLE); | |
748 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
749 | break; | |
750 | rc = -ERESTARTSYS; | |
751 | if (signal_pending(current)) | |
752 | break; | |
753 | rc = -EAGAIN; | |
754 | if (!timeout) | |
755 | break; | |
756 | rc = 0; | |
757 | if (skb_queue_empty(&sk->sk_receive_queue)) { | |
758 | release_sock(sk); | |
759 | timeout = schedule_timeout(timeout); | |
760 | lock_sock(sk); | |
761 | } else | |
762 | break; | |
763 | } | |
764 | __set_current_state(TASK_RUNNING); | |
765 | remove_wait_queue(sk->sk_sleep, &wait); | |
766 | return rc; | |
767 | } | |
768 | ||
769 | static int x25_accept(struct socket *sock, struct socket *newsock, int flags) | |
770 | { | |
771 | struct sock *sk = sock->sk; | |
772 | struct sock *newsk; | |
773 | struct sk_buff *skb; | |
774 | int rc = -EINVAL; | |
775 | ||
776 | if (!sk || sk->sk_state != TCP_LISTEN) | |
777 | goto out; | |
778 | ||
779 | rc = -EOPNOTSUPP; | |
780 | if (sk->sk_type != SOCK_SEQPACKET) | |
781 | goto out; | |
782 | ||
783 | lock_sock(sk); | |
784 | rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); | |
785 | if (rc) | |
786 | goto out2; | |
787 | skb = skb_dequeue(&sk->sk_receive_queue); | |
788 | rc = -EINVAL; | |
789 | if (!skb->sk) | |
790 | goto out2; | |
791 | newsk = skb->sk; | |
792 | newsk->sk_socket = newsock; | |
793 | newsk->sk_sleep = &newsock->wait; | |
794 | ||
795 | /* Now attach up the new socket */ | |
796 | skb->sk = NULL; | |
797 | kfree_skb(skb); | |
798 | sk->sk_ack_backlog--; | |
799 | newsock->sk = newsk; | |
800 | newsock->state = SS_CONNECTED; | |
801 | rc = 0; | |
802 | out2: | |
803 | release_sock(sk); | |
804 | out: | |
805 | return rc; | |
806 | } | |
807 | ||
808 | static int x25_getname(struct socket *sock, struct sockaddr *uaddr, | |
809 | int *uaddr_len, int peer) | |
810 | { | |
811 | struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; | |
812 | struct sock *sk = sock->sk; | |
813 | struct x25_sock *x25 = x25_sk(sk); | |
814 | ||
815 | if (peer) { | |
816 | if (sk->sk_state != TCP_ESTABLISHED) | |
817 | return -ENOTCONN; | |
818 | sx25->sx25_addr = x25->dest_addr; | |
819 | } else | |
820 | sx25->sx25_addr = x25->source_addr; | |
821 | ||
822 | sx25->sx25_family = AF_X25; | |
823 | *uaddr_len = sizeof(*sx25); | |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
828 | int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, | |
829 | unsigned int lci) | |
830 | { | |
831 | struct sock *sk; | |
832 | struct sock *make; | |
833 | struct x25_sock *makex25; | |
834 | struct x25_address source_addr, dest_addr; | |
835 | struct x25_facilities facilities; | |
836 | int len, rc; | |
837 | ||
838 | /* | |
839 | * Remove the LCI and frame type. | |
840 | */ | |
841 | skb_pull(skb, X25_STD_MIN_LEN); | |
842 | ||
843 | /* | |
844 | * Extract the X.25 addresses and convert them to ASCII strings, | |
845 | * and remove them. | |
846 | */ | |
847 | skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr)); | |
848 | ||
849 | /* | |
850 | * Get the length of the facilities, skip past them for the moment | |
851 | * get the call user data because this is needed to determine | |
852 | * the correct listener | |
853 | */ | |
854 | len = skb->data[0] + 1; | |
855 | skb_pull(skb,len); | |
856 | ||
857 | /* | |
858 | * Find a listener for the particular address/cud pair. | |
859 | */ | |
860 | sk = x25_find_listener(&source_addr,skb); | |
861 | skb_push(skb,len); | |
862 | ||
863 | /* | |
864 | * We can't accept the Call Request. | |
865 | */ | |
866 | if (sk == NULL || sk_acceptq_is_full(sk)) | |
867 | goto out_clear_request; | |
868 | ||
869 | /* | |
870 | * Try to reach a compromise on the requested facilities. | |
871 | */ | |
872 | if ((len = x25_negotiate_facilities(skb, sk, &facilities)) == -1) | |
873 | goto out_sock_put; | |
874 | ||
875 | /* | |
876 | * current neighbour/link might impose additional limits | |
877 | * on certain facilties | |
878 | */ | |
879 | ||
880 | x25_limit_facilities(&facilities, nb); | |
881 | ||
882 | /* | |
883 | * Try to create a new socket. | |
884 | */ | |
885 | make = x25_make_new(sk); | |
886 | if (!make) | |
887 | goto out_sock_put; | |
888 | ||
889 | /* | |
890 | * Remove the facilities | |
891 | */ | |
892 | skb_pull(skb, len); | |
893 | ||
894 | skb->sk = make; | |
895 | make->sk_state = TCP_ESTABLISHED; | |
896 | ||
897 | makex25 = x25_sk(make); | |
898 | makex25->lci = lci; | |
899 | makex25->dest_addr = dest_addr; | |
900 | makex25->source_addr = source_addr; | |
901 | makex25->neighbour = nb; | |
902 | makex25->facilities = facilities; | |
903 | makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; | |
904 | /* ensure no reverse facil on accept */ | |
905 | makex25->vc_facil_mask &= ~X25_MASK_REVERSE; | |
906 | makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; | |
907 | ||
908 | /* Normally all calls are accepted immediatly */ | |
909 | if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) { | |
910 | x25_write_internal(make, X25_CALL_ACCEPTED); | |
911 | makex25->state = X25_STATE_3; | |
912 | } | |
913 | ||
914 | /* | |
915 | * Incoming Call User Data. | |
916 | */ | |
917 | if (skb->len >= 0) { | |
918 | memcpy(makex25->calluserdata.cuddata, skb->data, skb->len); | |
919 | makex25->calluserdata.cudlength = skb->len; | |
920 | } | |
921 | ||
922 | sk->sk_ack_backlog++; | |
923 | ||
924 | x25_insert_socket(make); | |
925 | ||
926 | skb_queue_head(&sk->sk_receive_queue, skb); | |
927 | ||
928 | x25_start_heartbeat(make); | |
929 | ||
930 | if (!sock_flag(sk, SOCK_DEAD)) | |
931 | sk->sk_data_ready(sk, skb->len); | |
932 | rc = 1; | |
933 | sock_put(sk); | |
934 | out: | |
935 | return rc; | |
936 | out_sock_put: | |
937 | sock_put(sk); | |
938 | out_clear_request: | |
939 | rc = 0; | |
940 | x25_transmit_clear_request(nb, lci, 0x01); | |
941 | goto out; | |
942 | } | |
943 | ||
944 | static int x25_sendmsg(struct kiocb *iocb, struct socket *sock, | |
945 | struct msghdr *msg, size_t len) | |
946 | { | |
947 | struct sock *sk = sock->sk; | |
948 | struct x25_sock *x25 = x25_sk(sk); | |
949 | struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name; | |
950 | struct sockaddr_x25 sx25; | |
951 | struct sk_buff *skb; | |
952 | unsigned char *asmptr; | |
953 | int noblock = msg->msg_flags & MSG_DONTWAIT; | |
954 | size_t size; | |
955 | int qbit = 0, rc = -EINVAL; | |
956 | ||
957 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) | |
958 | goto out; | |
959 | ||
960 | /* we currently don't support segmented records at the user interface */ | |
961 | if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) | |
962 | goto out; | |
963 | ||
964 | rc = -EADDRNOTAVAIL; | |
965 | if (sock_flag(sk, SOCK_ZAPPED)) | |
966 | goto out; | |
967 | ||
968 | rc = -EPIPE; | |
969 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
970 | send_sig(SIGPIPE, current, 0); | |
971 | goto out; | |
972 | } | |
973 | ||
974 | rc = -ENETUNREACH; | |
975 | if (!x25->neighbour) | |
976 | goto out; | |
977 | ||
978 | if (usx25) { | |
979 | rc = -EINVAL; | |
980 | if (msg->msg_namelen < sizeof(sx25)) | |
981 | goto out; | |
982 | memcpy(&sx25, usx25, sizeof(sx25)); | |
983 | rc = -EISCONN; | |
984 | if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) | |
985 | goto out; | |
986 | rc = -EINVAL; | |
987 | if (sx25.sx25_family != AF_X25) | |
988 | goto out; | |
989 | } else { | |
990 | /* | |
991 | * FIXME 1003.1g - if the socket is like this because | |
992 | * it has become closed (not started closed) we ought | |
993 | * to SIGPIPE, EPIPE; | |
994 | */ | |
995 | rc = -ENOTCONN; | |
996 | if (sk->sk_state != TCP_ESTABLISHED) | |
997 | goto out; | |
998 | ||
999 | sx25.sx25_family = AF_X25; | |
1000 | sx25.sx25_addr = x25->dest_addr; | |
1001 | } | |
1002 | ||
1003 | SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); | |
1004 | ||
1005 | /* Build a packet */ | |
1006 | SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); | |
1007 | ||
1008 | if ((msg->msg_flags & MSG_OOB) && len > 32) | |
1009 | len = 32; | |
1010 | ||
1011 | size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; | |
1012 | ||
1013 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
1014 | if (!skb) | |
1015 | goto out; | |
1016 | X25_SKB_CB(skb)->flags = msg->msg_flags; | |
1017 | ||
1018 | skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); | |
1019 | ||
1020 | /* | |
1021 | * Put the data on the end | |
1022 | */ | |
1023 | SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); | |
1024 | ||
1025 | asmptr = skb->h.raw = skb_put(skb, len); | |
1026 | ||
1027 | rc = memcpy_fromiovec(asmptr, msg->msg_iov, len); | |
1028 | if (rc) | |
1029 | goto out_kfree_skb; | |
1030 | ||
1031 | /* | |
1032 | * If the Q BIT Include socket option is in force, the first | |
1033 | * byte of the user data is the logical value of the Q Bit. | |
1034 | */ | |
1035 | if (x25->qbitincl) { | |
1036 | qbit = skb->data[0]; | |
1037 | skb_pull(skb, 1); | |
1038 | } | |
1039 | ||
1040 | /* | |
1041 | * Push down the X.25 header | |
1042 | */ | |
1043 | SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); | |
1044 | ||
1045 | if (msg->msg_flags & MSG_OOB) { | |
1046 | if (x25->neighbour->extended) { | |
1047 | asmptr = skb_push(skb, X25_STD_MIN_LEN); | |
1048 | *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; | |
1049 | *asmptr++ = (x25->lci >> 0) & 0xFF; | |
1050 | *asmptr++ = X25_INTERRUPT; | |
1051 | } else { | |
1052 | asmptr = skb_push(skb, X25_STD_MIN_LEN); | |
1053 | *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; | |
1054 | *asmptr++ = (x25->lci >> 0) & 0xFF; | |
1055 | *asmptr++ = X25_INTERRUPT; | |
1056 | } | |
1057 | } else { | |
1058 | if (x25->neighbour->extended) { | |
1059 | /* Build an Extended X.25 header */ | |
1060 | asmptr = skb_push(skb, X25_EXT_MIN_LEN); | |
1061 | *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; | |
1062 | *asmptr++ = (x25->lci >> 0) & 0xFF; | |
1063 | *asmptr++ = X25_DATA; | |
1064 | *asmptr++ = X25_DATA; | |
1065 | } else { | |
1066 | /* Build an Standard X.25 header */ | |
1067 | asmptr = skb_push(skb, X25_STD_MIN_LEN); | |
1068 | *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; | |
1069 | *asmptr++ = (x25->lci >> 0) & 0xFF; | |
1070 | *asmptr++ = X25_DATA; | |
1071 | } | |
1072 | ||
1073 | if (qbit) | |
1074 | skb->data[0] |= X25_Q_BIT; | |
1075 | } | |
1076 | ||
1077 | SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); | |
1078 | SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); | |
1079 | ||
1080 | rc = -ENOTCONN; | |
1081 | if (sk->sk_state != TCP_ESTABLISHED) | |
1082 | goto out_kfree_skb; | |
1083 | ||
1084 | if (msg->msg_flags & MSG_OOB) | |
1085 | skb_queue_tail(&x25->interrupt_out_queue, skb); | |
1086 | else { | |
1087 | len = x25_output(sk, skb); | |
1088 | if (len < 0) | |
1089 | kfree_skb(skb); | |
1090 | else if (x25->qbitincl) | |
1091 | len++; | |
1092 | } | |
1093 | ||
1094 | /* | |
1095 | * lock_sock() is currently only used to serialize this x25_kick() | |
1096 | * against input-driven x25_kick() calls. It currently only blocks | |
1097 | * incoming packets for this socket and does not protect against | |
1098 | * any other socket state changes and is not called from anywhere | |
1099 | * else. As x25_kick() cannot block and as long as all socket | |
1100 | * operations are BKL-wrapped, we don't need take to care about | |
1101 | * purging the backlog queue in x25_release(). | |
1102 | * | |
1103 | * Using lock_sock() to protect all socket operations entirely | |
1104 | * (and making the whole x25 stack SMP aware) unfortunately would | |
1105 | * require major changes to {send,recv}msg and skb allocation methods. | |
1106 | * -> 2.5 ;) | |
1107 | */ | |
1108 | lock_sock(sk); | |
1109 | x25_kick(sk); | |
1110 | release_sock(sk); | |
1111 | rc = len; | |
1112 | out: | |
1113 | return rc; | |
1114 | out_kfree_skb: | |
1115 | kfree_skb(skb); | |
1116 | goto out; | |
1117 | } | |
1118 | ||
1119 | ||
1120 | static int x25_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1121 | struct msghdr *msg, size_t size, | |
1122 | int flags) | |
1123 | { | |
1124 | struct sock *sk = sock->sk; | |
1125 | struct x25_sock *x25 = x25_sk(sk); | |
1126 | struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name; | |
1127 | size_t copied; | |
1128 | int qbit; | |
1129 | struct sk_buff *skb; | |
1130 | unsigned char *asmptr; | |
1131 | int rc = -ENOTCONN; | |
1132 | ||
1133 | /* | |
1134 | * This works for seqpacket too. The receiver has ordered the queue for | |
1135 | * us! We do one quick check first though | |
1136 | */ | |
1137 | if (sk->sk_state != TCP_ESTABLISHED) | |
1138 | goto out; | |
1139 | ||
1140 | if (flags & MSG_OOB) { | |
1141 | rc = -EINVAL; | |
1142 | if (sock_flag(sk, SOCK_URGINLINE) || | |
1143 | !skb_peek(&x25->interrupt_in_queue)) | |
1144 | goto out; | |
1145 | ||
1146 | skb = skb_dequeue(&x25->interrupt_in_queue); | |
1147 | ||
1148 | skb_pull(skb, X25_STD_MIN_LEN); | |
1149 | ||
1150 | /* | |
1151 | * No Q bit information on Interrupt data. | |
1152 | */ | |
1153 | if (x25->qbitincl) { | |
1154 | asmptr = skb_push(skb, 1); | |
1155 | *asmptr = 0x00; | |
1156 | } | |
1157 | ||
1158 | msg->msg_flags |= MSG_OOB; | |
1159 | } else { | |
1160 | /* Now we can treat all alike */ | |
1161 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
1162 | flags & MSG_DONTWAIT, &rc); | |
1163 | if (!skb) | |
1164 | goto out; | |
1165 | ||
1166 | qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; | |
1167 | ||
1168 | skb_pull(skb, x25->neighbour->extended ? | |
1169 | X25_EXT_MIN_LEN : X25_STD_MIN_LEN); | |
1170 | ||
1171 | if (x25->qbitincl) { | |
1172 | asmptr = skb_push(skb, 1); | |
1173 | *asmptr = qbit; | |
1174 | } | |
1175 | } | |
1176 | ||
1177 | skb->h.raw = skb->data; | |
1178 | ||
1179 | copied = skb->len; | |
1180 | ||
1181 | if (copied > size) { | |
1182 | copied = size; | |
1183 | msg->msg_flags |= MSG_TRUNC; | |
1184 | } | |
1185 | ||
1186 | /* Currently, each datagram always contains a complete record */ | |
1187 | msg->msg_flags |= MSG_EOR; | |
1188 | ||
1189 | rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1190 | if (rc) | |
1191 | goto out_free_dgram; | |
1192 | ||
1193 | if (sx25) { | |
1194 | sx25->sx25_family = AF_X25; | |
1195 | sx25->sx25_addr = x25->dest_addr; | |
1196 | } | |
1197 | ||
1198 | msg->msg_namelen = sizeof(struct sockaddr_x25); | |
1199 | ||
1200 | lock_sock(sk); | |
1201 | x25_check_rbuf(sk); | |
1202 | release_sock(sk); | |
1203 | rc = copied; | |
1204 | out_free_dgram: | |
1205 | skb_free_datagram(sk, skb); | |
1206 | out: | |
1207 | return rc; | |
1208 | } | |
1209 | ||
1210 | ||
1211 | static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1212 | { | |
1213 | struct sock *sk = sock->sk; | |
1214 | struct x25_sock *x25 = x25_sk(sk); | |
1215 | void __user *argp = (void __user *)arg; | |
1216 | int rc; | |
1217 | ||
1218 | switch (cmd) { | |
1219 | case TIOCOUTQ: { | |
1220 | int amount = sk->sk_sndbuf - | |
1221 | atomic_read(&sk->sk_wmem_alloc); | |
1222 | if (amount < 0) | |
1223 | amount = 0; | |
1224 | rc = put_user(amount, (unsigned int __user *)argp); | |
1225 | break; | |
1226 | } | |
1227 | ||
1228 | case TIOCINQ: { | |
1229 | struct sk_buff *skb; | |
1230 | int amount = 0; | |
1231 | /* | |
1232 | * These two are safe on a single CPU system as | |
1233 | * only user tasks fiddle here | |
1234 | */ | |
1235 | if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) | |
1236 | amount = skb->len; | |
1237 | rc = put_user(amount, (unsigned int __user *)argp); | |
1238 | break; | |
1239 | } | |
1240 | ||
1241 | case SIOCGSTAMP: | |
1242 | rc = -EINVAL; | |
1243 | if (sk) | |
1244 | rc = sock_get_timestamp(sk, | |
1245 | (struct timeval __user *)argp); | |
1246 | break; | |
1247 | case SIOCGIFADDR: | |
1248 | case SIOCSIFADDR: | |
1249 | case SIOCGIFDSTADDR: | |
1250 | case SIOCSIFDSTADDR: | |
1251 | case SIOCGIFBRDADDR: | |
1252 | case SIOCSIFBRDADDR: | |
1253 | case SIOCGIFNETMASK: | |
1254 | case SIOCSIFNETMASK: | |
1255 | case SIOCGIFMETRIC: | |
1256 | case SIOCSIFMETRIC: | |
1257 | rc = -EINVAL; | |
1258 | break; | |
1259 | case SIOCADDRT: | |
1260 | case SIOCDELRT: | |
1261 | rc = -EPERM; | |
1262 | if (!capable(CAP_NET_ADMIN)) | |
1263 | break; | |
1264 | rc = x25_route_ioctl(cmd, argp); | |
1265 | break; | |
1266 | case SIOCX25GSUBSCRIP: | |
1267 | rc = x25_subscr_ioctl(cmd, argp); | |
1268 | break; | |
1269 | case SIOCX25SSUBSCRIP: | |
1270 | rc = -EPERM; | |
1271 | if (!capable(CAP_NET_ADMIN)) | |
1272 | break; | |
1273 | rc = x25_subscr_ioctl(cmd, argp); | |
1274 | break; | |
1275 | case SIOCX25GFACILITIES: { | |
1276 | struct x25_facilities fac = x25->facilities; | |
1277 | rc = copy_to_user(argp, &fac, | |
1278 | sizeof(fac)) ? -EFAULT : 0; | |
1279 | break; | |
1280 | } | |
1281 | ||
1282 | case SIOCX25SFACILITIES: { | |
1283 | struct x25_facilities facilities; | |
1284 | rc = -EFAULT; | |
1285 | if (copy_from_user(&facilities, argp, | |
1286 | sizeof(facilities))) | |
1287 | break; | |
1288 | rc = -EINVAL; | |
1289 | if (sk->sk_state != TCP_LISTEN && | |
1290 | sk->sk_state != TCP_CLOSE) | |
1291 | break; | |
1292 | if (facilities.pacsize_in < X25_PS16 || | |
1293 | facilities.pacsize_in > X25_PS4096) | |
1294 | break; | |
1295 | if (facilities.pacsize_out < X25_PS16 || | |
1296 | facilities.pacsize_out > X25_PS4096) | |
1297 | break; | |
1298 | if (facilities.winsize_in < 1 || | |
1299 | facilities.winsize_in > 127) | |
1300 | break; | |
1301 | if (facilities.throughput < 0x03 || | |
1302 | facilities.throughput > 0xDD) | |
1303 | break; | |
1304 | if (facilities.reverse && | |
1305 | (facilities.reverse | 0x81)!= 0x81) | |
1306 | break; | |
1307 | x25->facilities = facilities; | |
1308 | rc = 0; | |
1309 | break; | |
1310 | } | |
1311 | ||
1312 | case SIOCX25GCALLUSERDATA: { | |
1313 | struct x25_calluserdata cud = x25->calluserdata; | |
1314 | rc = copy_to_user(argp, &cud, | |
1315 | sizeof(cud)) ? -EFAULT : 0; | |
1316 | break; | |
1317 | } | |
1318 | ||
1319 | case SIOCX25SCALLUSERDATA: { | |
1320 | struct x25_calluserdata calluserdata; | |
1321 | ||
1322 | rc = -EFAULT; | |
1323 | if (copy_from_user(&calluserdata, argp, | |
1324 | sizeof(calluserdata))) | |
1325 | break; | |
1326 | rc = -EINVAL; | |
1327 | if (calluserdata.cudlength > X25_MAX_CUD_LEN) | |
1328 | break; | |
1329 | x25->calluserdata = calluserdata; | |
1330 | rc = 0; | |
1331 | break; | |
1332 | } | |
1333 | ||
1334 | case SIOCX25GCAUSEDIAG: { | |
1335 | struct x25_causediag causediag; | |
1336 | causediag = x25->causediag; | |
1337 | rc = copy_to_user(argp, &causediag, | |
1338 | sizeof(causediag)) ? -EFAULT : 0; | |
1339 | break; | |
1340 | } | |
1341 | ||
1342 | case SIOCX25SCUDMATCHLEN: { | |
1343 | struct x25_subaddr sub_addr; | |
1344 | rc = -EINVAL; | |
1345 | if(sk->sk_state != TCP_CLOSE) | |
1346 | break; | |
1347 | rc = -EFAULT; | |
1348 | if (copy_from_user(&sub_addr, argp, | |
1349 | sizeof(sub_addr))) | |
1350 | break; | |
1351 | rc = -EINVAL; | |
1352 | if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN) | |
1353 | break; | |
1354 | x25->cudmatchlength = sub_addr.cudmatchlength; | |
1355 | rc = 0; | |
1356 | break; | |
1357 | } | |
1358 | ||
1359 | case SIOCX25CALLACCPTAPPRV: { | |
1360 | rc = -EINVAL; | |
1361 | if (sk->sk_state != TCP_CLOSE) | |
1362 | break; | |
1363 | x25->accptapprv = X25_ALLOW_ACCPT_APPRV; | |
1364 | rc = 0; | |
1365 | break; | |
1366 | } | |
1367 | ||
1368 | case SIOCX25SENDCALLACCPT: { | |
1369 | rc = -EINVAL; | |
1370 | if (sk->sk_state != TCP_ESTABLISHED) | |
1371 | break; | |
1372 | if (x25->accptapprv) /* must call accptapprv above */ | |
1373 | break; | |
1374 | x25_write_internal(sk, X25_CALL_ACCEPTED); | |
1375 | x25->state = X25_STATE_3; | |
1376 | rc = 0; | |
1377 | break; | |
1378 | } | |
1379 | ||
1380 | default: | |
1381 | rc = dev_ioctl(cmd, argp); | |
1382 | break; | |
1383 | } | |
1384 | ||
1385 | return rc; | |
1386 | } | |
1387 | ||
1388 | static struct net_proto_family x25_family_ops = { | |
1389 | .family = AF_X25, | |
1390 | .create = x25_create, | |
1391 | .owner = THIS_MODULE, | |
1392 | }; | |
1393 | ||
1394 | static struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = { | |
1395 | .family = AF_X25, | |
1396 | .owner = THIS_MODULE, | |
1397 | .release = x25_release, | |
1398 | .bind = x25_bind, | |
1399 | .connect = x25_connect, | |
1400 | .socketpair = sock_no_socketpair, | |
1401 | .accept = x25_accept, | |
1402 | .getname = x25_getname, | |
1403 | .poll = datagram_poll, | |
1404 | .ioctl = x25_ioctl, | |
1405 | .listen = x25_listen, | |
1406 | .shutdown = sock_no_shutdown, | |
1407 | .setsockopt = x25_setsockopt, | |
1408 | .getsockopt = x25_getsockopt, | |
1409 | .sendmsg = x25_sendmsg, | |
1410 | .recvmsg = x25_recvmsg, | |
1411 | .mmap = sock_no_mmap, | |
1412 | .sendpage = sock_no_sendpage, | |
1413 | }; | |
1414 | ||
1415 | #include <linux/smp_lock.h> | |
1416 | SOCKOPS_WRAP(x25_proto, AF_X25); | |
1417 | ||
1418 | static struct packet_type x25_packet_type = { | |
1419 | .type = __constant_htons(ETH_P_X25), | |
1420 | .func = x25_lapb_receive_frame, | |
1421 | }; | |
1422 | ||
1423 | static struct notifier_block x25_dev_notifier = { | |
1424 | .notifier_call = x25_device_event, | |
1425 | }; | |
1426 | ||
1427 | void x25_kill_by_neigh(struct x25_neigh *nb) | |
1428 | { | |
1429 | struct sock *s; | |
1430 | struct hlist_node *node; | |
1431 | ||
1432 | write_lock_bh(&x25_list_lock); | |
1433 | ||
1434 | sk_for_each(s, node, &x25_list) | |
1435 | if (x25_sk(s)->neighbour == nb) | |
1436 | x25_disconnect(s, ENETUNREACH, 0, 0); | |
1437 | ||
1438 | write_unlock_bh(&x25_list_lock); | |
1439 | } | |
1440 | ||
1441 | static int __init x25_init(void) | |
1442 | { | |
1443 | int rc = proto_register(&x25_proto, 0); | |
1444 | ||
1445 | if (rc != 0) | |
1446 | goto out; | |
1447 | ||
1448 | sock_register(&x25_family_ops); | |
1449 | ||
1450 | dev_add_pack(&x25_packet_type); | |
1451 | ||
1452 | register_netdevice_notifier(&x25_dev_notifier); | |
1453 | ||
1454 | printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n"); | |
1455 | ||
1456 | #ifdef CONFIG_SYSCTL | |
1457 | x25_register_sysctl(); | |
1458 | #endif | |
1459 | x25_proc_init(); | |
1460 | out: | |
1461 | return rc; | |
1462 | } | |
1463 | module_init(x25_init); | |
1464 | ||
1465 | static void __exit x25_exit(void) | |
1466 | { | |
1467 | x25_proc_exit(); | |
1468 | x25_link_free(); | |
1469 | x25_route_free(); | |
1470 | ||
1471 | #ifdef CONFIG_SYSCTL | |
1472 | x25_unregister_sysctl(); | |
1473 | #endif | |
1474 | ||
1475 | unregister_netdevice_notifier(&x25_dev_notifier); | |
1476 | ||
1477 | dev_remove_pack(&x25_packet_type); | |
1478 | ||
1479 | sock_unregister(AF_X25); | |
1480 | proto_unregister(&x25_proto); | |
1481 | } | |
1482 | module_exit(x25_exit); | |
1483 | ||
1484 | MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); | |
1485 | MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); | |
1486 | MODULE_LICENSE("GPL"); | |
1487 | MODULE_ALIAS_NETPROTO(PF_X25); |