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allow coexistance of N build and AC build.
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / net / x25 / af_x25.c
blobba57749a83b3756a66e337614e3c76c383e03d07
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/module.h>
39 #include <linux/capability.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_states.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 <linux/compat.h>
57
58 #include <net/x25.h>
59 #include <net/compat.h>
60
61 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
62 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
63 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
64 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
65 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
66 int sysctl_x25_forward = 0;
67
68 HLIST_HEAD(x25_list);
69 DEFINE_RWLOCK(x25_list_lock);
70
71 static const struct proto_ops x25_proto_ops;
72
73 static struct x25_address null_x25_address = {" "};
74
75 #ifdef CONFIG_COMPAT
76 struct compat_x25_subscrip_struct {
77 char device[200-sizeof(compat_ulong_t)];
78 compat_ulong_t global_facil_mask;
79 compat_uint_t extended;
80 };
81 #endif
82
83 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
84 struct x25_address *calling_addr)
85 {
86 int called_len, calling_len;
87 char *called, *calling;
88 int i;
89
90 called_len = (*p >> 0) & 0x0F;
91 calling_len = (*p >> 4) & 0x0F;
92
93 called = called_addr->x25_addr;
94 calling = calling_addr->x25_addr;
95 p++;
96
97 for (i = 0; i < (called_len + calling_len); i++) {
98 if (i < called_len) {
99 if (i % 2 != 0) {
100 *called++ = ((*p >> 0) & 0x0F) + '0';
101 p++;
102 } else {
103 *called++ = ((*p >> 4) & 0x0F) + '0';
104 }
105 } else {
106 if (i % 2 != 0) {
107 *calling++ = ((*p >> 0) & 0x0F) + '0';
108 p++;
109 } else {
110 *calling++ = ((*p >> 4) & 0x0F) + '0';
111 }
112 }
113 }
114
115 *called = *calling = '\0';
116
117 return 1 + (called_len + calling_len + 1) / 2;
118 }
119
120 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
121 struct x25_address *calling_addr)
122 {
123 unsigned int called_len, calling_len;
124 char *called, *calling;
125 int i;
126
127 called = called_addr->x25_addr;
128 calling = calling_addr->x25_addr;
129
130 called_len = strlen(called);
131 calling_len = strlen(calling);
132
133 *p++ = (calling_len << 4) | (called_len << 0);
134
135 for (i = 0; i < (called_len + calling_len); i++) {
136 if (i < called_len) {
137 if (i % 2 != 0) {
138 *p |= (*called++ - '0') << 0;
139 p++;
140 } else {
141 *p = 0x00;
142 *p |= (*called++ - '0') << 4;
143 }
144 } else {
145 if (i % 2 != 0) {
146 *p |= (*calling++ - '0') << 0;
147 p++;
148 } else {
149 *p = 0x00;
150 *p |= (*calling++ - '0') << 4;
151 }
152 }
153 }
154
155 return 1 + (called_len + calling_len + 1) / 2;
156 }
157
158 /*
159 * Socket removal during an interrupt is now safe.
160 */
161 static void x25_remove_socket(struct sock *sk)
162 {
163 write_lock_bh(&x25_list_lock);
164 sk_del_node_init(sk);
165 write_unlock_bh(&x25_list_lock);
166 }
167
168 /*
169 * Kill all bound sockets on a dropped device.
170 */
171 static void x25_kill_by_device(struct net_device *dev)
172 {
173 struct sock *s;
174 struct hlist_node *node;
175
176 write_lock_bh(&x25_list_lock);
177
178 sk_for_each(s, node, &x25_list)
179 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
180 x25_disconnect(s, ENETUNREACH, 0, 0);
181
182 write_unlock_bh(&x25_list_lock);
183 }
184
185 /*
186 * Handle device status changes.
187 */
188 static int x25_device_event(struct notifier_block *this, unsigned long event,
189 void *ptr)
190 {
191 struct net_device *dev = ptr;
192 struct x25_neigh *nb;
193
194 if (dev->type == ARPHRD_X25
195 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
196 || dev->type == ARPHRD_ETHER
197 #endif
198 ) {
199 switch (event) {
200 case NETDEV_UP:
201 x25_link_device_up(dev);
202 break;
203 case NETDEV_GOING_DOWN:
204 nb = x25_get_neigh(dev);
205 if (nb) {
206 x25_terminate_link(nb);
207 x25_neigh_put(nb);
208 }
209 break;
210 case NETDEV_DOWN:
211 x25_kill_by_device(dev);
212 x25_route_device_down(dev);
213 x25_link_device_down(dev);
214 break;
215 }
216 }
217
218 return NOTIFY_DONE;
219 }
220
221 /*
222 * Add a socket to the bound sockets list.
223 */
224 static void x25_insert_socket(struct sock *sk)
225 {
226 write_lock_bh(&x25_list_lock);
227 sk_add_node(sk, &x25_list);
228 write_unlock_bh(&x25_list_lock);
229 }
230
231 /*
232 * Find a socket that wants to accept the Call Request we just
233 * received. Check the full list for an address/cud match.
234 * If no cuds match return the next_best thing, an address match.
235 * Note: if a listening socket has cud set it must only get calls
236 * with matching cud.
237 */
238 static struct sock *x25_find_listener(struct x25_address *addr,
239 struct sk_buff *skb)
240 {
241 struct sock *s;
242 struct sock *next_best;
243 struct hlist_node *node;
244
245 read_lock_bh(&x25_list_lock);
246 next_best = NULL;
247
248 sk_for_each(s, node, &x25_list)
249 if ((!strcmp(addr->x25_addr,
250 x25_sk(s)->source_addr.x25_addr) ||
251 !strcmp(addr->x25_addr,
252 null_x25_address.x25_addr)) &&
253 s->sk_state == TCP_LISTEN) {
254 /*
255 * Found a listening socket, now check the incoming
256 * call user data vs this sockets call user data
257 */
258 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
259 if((memcmp(x25_sk(s)->calluserdata.cuddata,
260 skb->data,
261 x25_sk(s)->cudmatchlength)) == 0) {
262 sock_hold(s);
263 goto found;
264 }
265 } else
266 next_best = s;
267 }
268 if (next_best) {
269 s = next_best;
270 sock_hold(s);
271 goto found;
272 }
273 s = NULL;
274 found:
275 read_unlock_bh(&x25_list_lock);
276 return s;
277 }
278
279 /*
280 * Find a connected X.25 socket given my LCI and neighbour.
281 */
282 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
283 {
284 struct sock *s;
285 struct hlist_node *node;
286
287 sk_for_each(s, node, &x25_list)
288 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
289 sock_hold(s);
290 goto found;
291 }
292 s = NULL;
293 found:
294 return s;
295 }
296
297 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
298 {
299 struct sock *s;
300
301 read_lock_bh(&x25_list_lock);
302 s = __x25_find_socket(lci, nb);
303 read_unlock_bh(&x25_list_lock);
304 return s;
305 }
306
307 /*
308 * Find a unique LCI for a given device.
309 */
310 static unsigned int x25_new_lci(struct x25_neigh *nb)
311 {
312 unsigned int lci = 1;
313 struct sock *sk;
314
315 read_lock_bh(&x25_list_lock);
316
317 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
318 sock_put(sk);
319 if (++lci == 4096) {
320 lci = 0;
321 break;
322 }
323 }
324
325 read_unlock_bh(&x25_list_lock);
326 return lci;
327 }
328
329 /*
330 * Deferred destroy.
331 */
332 void x25_destroy_socket(struct sock *);
333
334 /*
335 * handler for deferred kills.
336 */
337 static void x25_destroy_timer(unsigned long data)
338 {
339 x25_destroy_socket((struct sock *)data);
340 }
341
342 /*
343 * This is called from user mode and the timers. Thus it protects itself
344 * against interrupt users but doesn't worry about being called during
345 * work. Once it is removed from the queue no interrupt or bottom half
346 * will touch it and we are (fairly 8-) ) safe.
347 * Not static as it's used by the timer
348 */
349 void x25_destroy_socket(struct sock *sk)
350 {
351 struct sk_buff *skb;
352
353 sock_hold(sk);
354 lock_sock(sk);
355 x25_stop_heartbeat(sk);
356 x25_stop_timer(sk);
357
358 x25_remove_socket(sk);
359 x25_clear_queues(sk); /* Flush the queues */
360
361 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
362 if (skb->sk != sk) { /* A pending connection */
363 /*
364 * Queue the unaccepted socket for death
365 */
366 sock_set_flag(skb->sk, SOCK_DEAD);
367 x25_start_heartbeat(skb->sk);
368 x25_sk(skb->sk)->state = X25_STATE_0;
369 }
370
371 kfree_skb(skb);
372 }
373
374 if (sk_has_allocations(sk)) {
375 /* Defer: outstanding buffers */
376 sk->sk_timer.expires = jiffies + 10 * HZ;
377 sk->sk_timer.function = x25_destroy_timer;
378 sk->sk_timer.data = (unsigned long)sk;
379 add_timer(&sk->sk_timer);
380 } else {
381 /* drop last reference so sock_put will free */
382 __sock_put(sk);
383 }
384
385 release_sock(sk);
386 sock_put(sk);
387 }
388
389 /*
390 * Handling for system calls applied via the various interfaces to a
391 * X.25 socket object.
392 */
393
394 static int x25_setsockopt(struct socket *sock, int level, int optname,
395 char __user *optval, int optlen)
396 {
397 int opt;
398 struct sock *sk = sock->sk;
399 int rc = -ENOPROTOOPT;
400
401 if (level != SOL_X25 || optname != X25_QBITINCL)
402 goto out;
403
404 rc = -EINVAL;
405 if (optlen < sizeof(int))
406 goto out;
407
408 rc = -EFAULT;
409 if (get_user(opt, (int __user *)optval))
410 goto out;
411
412 x25_sk(sk)->qbitincl = !!opt;
413 rc = 0;
414 out:
415 return rc;
416 }
417
418 static int x25_getsockopt(struct socket *sock, int level, int optname,
419 char __user *optval, int __user *optlen)
420 {
421 struct sock *sk = sock->sk;
422 int val, len, rc = -ENOPROTOOPT;
423
424 if (level != SOL_X25 || optname != X25_QBITINCL)
425 goto out;
426
427 rc = -EFAULT;
428 if (get_user(len, optlen))
429 goto out;
430
431 len = min_t(unsigned int, len, sizeof(int));
432
433 rc = -EINVAL;
434 if (len < 0)
435 goto out;
436
437 rc = -EFAULT;
438 if (put_user(len, optlen))
439 goto out;
440
441 val = x25_sk(sk)->qbitincl;
442 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
443 out:
444 return rc;
445 }
446
447 static int x25_listen(struct socket *sock, int backlog)
448 {
449 struct sock *sk = sock->sk;
450 int rc = -EOPNOTSUPP;
451
452 if (sk->sk_state != TCP_LISTEN) {
453 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
454 sk->sk_max_ack_backlog = backlog;
455 sk->sk_state = TCP_LISTEN;
456 rc = 0;
457 }
458
459 return rc;
460 }
461
462 static struct proto x25_proto = {
463 .name = "X25",
464 .owner = THIS_MODULE,
465 .obj_size = sizeof(struct x25_sock),
466 };
467
468 static struct sock *x25_alloc_socket(void)
469 {
470 struct x25_sock *x25;
471 struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, &x25_proto, 1);
472
473 if (!sk)
474 goto out;
475
476 sock_init_data(NULL, sk);
477
478 x25 = x25_sk(sk);
479 skb_queue_head_init(&x25->ack_queue);
480 skb_queue_head_init(&x25->fragment_queue);
481 skb_queue_head_init(&x25->interrupt_in_queue);
482 skb_queue_head_init(&x25->interrupt_out_queue);
483 out:
484 return sk;
485 }
486
487 static int x25_create(struct socket *sock, int protocol)
488 {
489 struct sock *sk;
490 struct x25_sock *x25;
491 int rc = -ESOCKTNOSUPPORT;
492
493 if (sock->type != SOCK_SEQPACKET || protocol)
494 goto out;
495
496 rc = -ENOMEM;
497 if ((sk = x25_alloc_socket()) == NULL)
498 goto out;
499
500 x25 = x25_sk(sk);
501
502 sock_init_data(sock, sk);
503
504 x25_init_timers(sk);
505
506 sock->ops = &x25_proto_ops;
507 sk->sk_protocol = protocol;
508 sk->sk_backlog_rcv = x25_backlog_rcv;
509
510 x25->t21 = sysctl_x25_call_request_timeout;
511 x25->t22 = sysctl_x25_reset_request_timeout;
512 x25->t23 = sysctl_x25_clear_request_timeout;
513 x25->t2 = sysctl_x25_ack_holdback_timeout;
514 x25->state = X25_STATE_0;
515 x25->cudmatchlength = 0;
516 x25->accptapprv = X25_DENY_ACCPT_APPRV; /* normally no cud */
517 /* on call accept */
518
519 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
520 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
521 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
522 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
523 x25->facilities.throughput = X25_DEFAULT_THROUGHPUT;
524 x25->facilities.reverse = X25_DEFAULT_REVERSE;
525 x25->dte_facilities.calling_len = 0;
526 x25->dte_facilities.called_len = 0;
527 memset(x25->dte_facilities.called_ae, '\0',
528 sizeof(x25->dte_facilities.called_ae));
529 memset(x25->dte_facilities.calling_ae, '\0',
530 sizeof(x25->dte_facilities.calling_ae));
531
532 rc = 0;
533 out:
534 return rc;
535 }
536
537 static struct sock *x25_make_new(struct sock *osk)
538 {
539 struct sock *sk = NULL;
540 struct x25_sock *x25, *ox25;
541
542 if (osk->sk_type != SOCK_SEQPACKET)
543 goto out;
544
545 if ((sk = x25_alloc_socket()) == NULL)
546 goto out;
547
548 x25 = x25_sk(sk);
549
550 sk->sk_type = osk->sk_type;
551 sk->sk_socket = osk->sk_socket;
552 sk->sk_priority = osk->sk_priority;
553 sk->sk_protocol = osk->sk_protocol;
554 sk->sk_rcvbuf = osk->sk_rcvbuf;
555 sk->sk_sndbuf = osk->sk_sndbuf;
556 sk->sk_state = TCP_ESTABLISHED;
557 sk->sk_sleep = osk->sk_sleep;
558 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
559 sock_copy_flags(sk, osk);
560
561 ox25 = x25_sk(osk);
562 x25->t21 = ox25->t21;
563 x25->t22 = ox25->t22;
564 x25->t23 = ox25->t23;
565 x25->t2 = ox25->t2;
566 x25->facilities = ox25->facilities;
567 x25->qbitincl = ox25->qbitincl;
568 x25->dte_facilities = ox25->dte_facilities;
569 x25->cudmatchlength = ox25->cudmatchlength;
570 x25->accptapprv = ox25->accptapprv;
571
572 x25_init_timers(sk);
573 out:
574 return sk;
575 }
576
577 static int x25_release(struct socket *sock)
578 {
579 struct sock *sk = sock->sk;
580 struct x25_sock *x25;
581
582 if (!sk)
583 goto out;
584
585 x25 = x25_sk(sk);
586
587 switch (x25->state) {
588
589 case X25_STATE_0:
590 case X25_STATE_2:
591 x25_disconnect(sk, 0, 0, 0);
592 x25_destroy_socket(sk);
593 goto out;
594
595 case X25_STATE_1:
596 case X25_STATE_3:
597 case X25_STATE_4:
598 x25_clear_queues(sk);
599 x25_write_internal(sk, X25_CLEAR_REQUEST);
600 x25_start_t23timer(sk);
601 x25->state = X25_STATE_2;
602 sk->sk_state = TCP_CLOSE;
603 sk->sk_shutdown |= SEND_SHUTDOWN;
604 sk->sk_state_change(sk);
605 sock_set_flag(sk, SOCK_DEAD);
606 sock_set_flag(sk, SOCK_DESTROY);
607 break;
608 }
609
610 sock->sk = NULL;
611 sk->sk_socket = NULL; /* Not used, but we should do this */
612 out:
613 return 0;
614 }
615
616 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
617 {
618 struct sock *sk = sock->sk;
619 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
620
621 if (!sock_flag(sk, SOCK_ZAPPED) ||
622 addr_len != sizeof(struct sockaddr_x25) ||
623 addr->sx25_family != AF_X25)
624 return -EINVAL;
625
626 x25_sk(sk)->source_addr = addr->sx25_addr;
627 x25_insert_socket(sk);
628 sock_reset_flag(sk, SOCK_ZAPPED);
629 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
630
631 return 0;
632 }
633
634 static int x25_wait_for_connection_establishment(struct sock *sk)
635 {
636 DECLARE_WAITQUEUE(wait, current);
637 int rc;
638
639 add_wait_queue_exclusive(sk->sk_sleep, &wait);
640 for (;;) {
641 __set_current_state(TASK_INTERRUPTIBLE);
642 rc = -ERESTARTSYS;
643 if (signal_pending(current))
644 break;
645 rc = sock_error(sk);
646 if (rc) {
647 sk->sk_socket->state = SS_UNCONNECTED;
648 break;
649 }
650 rc = 0;
651 if (sk->sk_state != TCP_ESTABLISHED) {
652 release_sock(sk);
653 schedule();
654 lock_sock(sk);
655 } else
656 break;
657 }
658 __set_current_state(TASK_RUNNING);
659 remove_wait_queue(sk->sk_sleep, &wait);
660 return rc;
661 }
662
663 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
664 int addr_len, int flags)
665 {
666 struct sock *sk = sock->sk;
667 struct x25_sock *x25 = x25_sk(sk);
668 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
669 struct x25_route *rt;
670 int rc = 0;
671
672 lock_sock(sk);
673 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
674 sock->state = SS_CONNECTED;
675 goto out; /* Connect completed during a ERESTARTSYS event */
676 }
677
678 rc = -ECONNREFUSED;
679 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
680 sock->state = SS_UNCONNECTED;
681 goto out;
682 }
683
684 rc = -EISCONN; /* No reconnect on a seqpacket socket */
685 if (sk->sk_state == TCP_ESTABLISHED)
686 goto out;
687
688 sk->sk_state = TCP_CLOSE;
689 sock->state = SS_UNCONNECTED;
690
691 rc = -EINVAL;
692 if (addr_len != sizeof(struct sockaddr_x25) ||
693 addr->sx25_family != AF_X25)
694 goto out;
695
696 rc = -ENETUNREACH;
697 rt = x25_get_route(&addr->sx25_addr);
698 if (!rt)
699 goto out;
700
701 x25->neighbour = x25_get_neigh(rt->dev);
702 if (!x25->neighbour)
703 goto out_put_route;
704
705 x25_limit_facilities(&x25->facilities, x25->neighbour);
706
707 x25->lci = x25_new_lci(x25->neighbour);
708 if (!x25->lci)
709 goto out_put_neigh;
710
711 rc = -EINVAL;
712 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
713 goto out_put_neigh;
714
715 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
716 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
717
718 x25->dest_addr = addr->sx25_addr;
719
720 /* Move to connecting socket, start sending Connect Requests */
721 sock->state = SS_CONNECTING;
722 sk->sk_state = TCP_SYN_SENT;
723
724 x25->state = X25_STATE_1;
725
726 x25_write_internal(sk, X25_CALL_REQUEST);
727
728 x25_start_heartbeat(sk);
729 x25_start_t21timer(sk);
730
731 /* Now the loop */
732 rc = -EINPROGRESS;
733 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
734 goto out_put_neigh;
735
736 rc = x25_wait_for_connection_establishment(sk);
737 if (rc)
738 goto out_put_neigh;
739
740 sock->state = SS_CONNECTED;
741 rc = 0;
742 out_put_neigh:
743 if (rc)
744 x25_neigh_put(x25->neighbour);
745 out_put_route:
746 x25_route_put(rt);
747 out:
748 release_sock(sk);
749 return rc;
750 }
751
752 static int x25_wait_for_data(struct sock *sk, long timeout)
753 {
754 DECLARE_WAITQUEUE(wait, current);
755 int rc = 0;
756
757 add_wait_queue_exclusive(sk->sk_sleep, &wait);
758 for (;;) {
759 __set_current_state(TASK_INTERRUPTIBLE);
760 if (sk->sk_shutdown & RCV_SHUTDOWN)
761 break;
762 rc = -ERESTARTSYS;
763 if (signal_pending(current))
764 break;
765 rc = -EAGAIN;
766 if (!timeout)
767 break;
768 rc = 0;
769 if (skb_queue_empty(&sk->sk_receive_queue)) {
770 release_sock(sk);
771 timeout = schedule_timeout(timeout);
772 lock_sock(sk);
773 } else
774 break;
775 }
776 __set_current_state(TASK_RUNNING);
777 remove_wait_queue(sk->sk_sleep, &wait);
778 return rc;
779 }
780
781 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
782 {
783 struct sock *sk = sock->sk;
784 struct sock *newsk;
785 struct sk_buff *skb;
786 int rc = -EINVAL;
787
788 if (!sk || sk->sk_state != TCP_LISTEN)
789 goto out;
790
791 rc = -EOPNOTSUPP;
792 if (sk->sk_type != SOCK_SEQPACKET)
793 goto out;
794
795 lock_sock(sk);
796 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
797 if (rc)
798 goto out2;
799 skb = skb_dequeue(&sk->sk_receive_queue);
800 rc = -EINVAL;
801 if (!skb->sk)
802 goto out2;
803 newsk = skb->sk;
804 newsk->sk_socket = newsock;
805 newsk->sk_sleep = &newsock->wait;
806
807 /* Now attach up the new socket */
808 skb->sk = NULL;
809 kfree_skb(skb);
810 sk->sk_ack_backlog--;
811 newsock->sk = newsk;
812 newsock->state = SS_CONNECTED;
813 rc = 0;
814 out2:
815 release_sock(sk);
816 out:
817 return rc;
818 }
819
820 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
821 int *uaddr_len, int peer)
822 {
823 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
824 struct sock *sk = sock->sk;
825 struct x25_sock *x25 = x25_sk(sk);
826
827 if (peer) {
828 if (sk->sk_state != TCP_ESTABLISHED)
829 return -ENOTCONN;
830 sx25->sx25_addr = x25->dest_addr;
831 } else
832 sx25->sx25_addr = x25->source_addr;
833
834 sx25->sx25_family = AF_X25;
835 *uaddr_len = sizeof(*sx25);
836
837 return 0;
838 }
839
840 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
841 unsigned int lci)
842 {
843 struct sock *sk;
844 struct sock *make;
845 struct x25_sock *makex25;
846 struct x25_address source_addr, dest_addr;
847 struct x25_facilities facilities;
848 struct x25_dte_facilities dte_facilities;
849 int len, addr_len, rc;
850
851 /*
852 * Remove the LCI and frame type.
853 */
854 skb_pull(skb, X25_STD_MIN_LEN);
855
856 /*
857 * Extract the X.25 addresses and convert them to ASCII strings,
858 * and remove them.
859 */
860 addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
861 skb_pull(skb, addr_len);
862
863 /*
864 * Get the length of the facilities, skip past them for the moment
865 * get the call user data because this is needed to determine
866 * the correct listener
867 */
868 len = skb->data[0] + 1;
869 skb_pull(skb,len);
870
871 /*
872 * Find a listener for the particular address/cud pair.
873 */
874 sk = x25_find_listener(&source_addr,skb);
875 skb_push(skb,len);
876
877 if (sk != NULL && sk_acceptq_is_full(sk)) {
878 goto out_sock_put;
879 }
880
881 /*
882 * We dont have any listeners for this incoming call.
883 * Try forwarding it.
884 */
885 if (sk == NULL) {
886 skb_push(skb, addr_len + X25_STD_MIN_LEN);
887 if (sysctl_x25_forward &&
888 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
889 {
890 /* Call was forwarded, dont process it any more */
891 kfree_skb(skb);
892 rc = 1;
893 goto out;
894 } else {
895 /* No listeners, can't forward, clear the call */
896 goto out_clear_request;
897 }
898 }
899
900 /*
901 * Try to reach a compromise on the requested facilities.
902 */
903 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
904 if (len == -1)
905 goto out_sock_put;
906
907 /*
908 * current neighbour/link might impose additional limits
909 * on certain facilties
910 */
911
912 x25_limit_facilities(&facilities, nb);
913
914 /*
915 * Try to create a new socket.
916 */
917 make = x25_make_new(sk);
918 if (!make)
919 goto out_sock_put;
920
921 /*
922 * Remove the facilities
923 */
924 skb_pull(skb, len);
925
926 skb->sk = make;
927 make->sk_state = TCP_ESTABLISHED;
928
929 makex25 = x25_sk(make);
930 makex25->lci = lci;
931 makex25->dest_addr = dest_addr;
932 makex25->source_addr = source_addr;
933 makex25->neighbour = nb;
934 makex25->facilities = facilities;
935 makex25->dte_facilities= dte_facilities;
936 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
937 /* ensure no reverse facil on accept */
938 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
939 /* ensure no calling address extension on accept */
940 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
941 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
942
943 /* Normally all calls are accepted immediatly */
944 if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
945 x25_write_internal(make, X25_CALL_ACCEPTED);
946 makex25->state = X25_STATE_3;
947 }
948
949 /*
950 * Incoming Call User Data.
951 */
952 if (skb->len >= 0) {
953 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
954 makex25->calluserdata.cudlength = skb->len;
955 }
956
957 sk->sk_ack_backlog++;
958
959 x25_insert_socket(make);
960
961 skb_queue_head(&sk->sk_receive_queue, skb);
962
963 x25_start_heartbeat(make);
964
965 if (!sock_flag(sk, SOCK_DEAD))
966 sk->sk_data_ready(sk, skb->len);
967 rc = 1;
968 sock_put(sk);
969 out:
970 return rc;
971 out_sock_put:
972 sock_put(sk);
973 out_clear_request:
974 rc = 0;
975 x25_transmit_clear_request(nb, lci, 0x01);
976 goto out;
977 }
978
979 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
980 struct msghdr *msg, size_t len)
981 {
982 struct sock *sk = sock->sk;
983 struct x25_sock *x25 = x25_sk(sk);
984 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
985 struct sockaddr_x25 sx25;
986 struct sk_buff *skb;
987 unsigned char *asmptr;
988 int noblock = msg->msg_flags & MSG_DONTWAIT;
989 size_t size;
990 int qbit = 0, rc = -EINVAL;
991
992 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
993 goto out;
994
995 /* we currently don't support segmented records at the user interface */
996 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
997 goto out;
998
999 rc = -EADDRNOTAVAIL;
1000 if (sock_flag(sk, SOCK_ZAPPED))
1001 goto out;
1002
1003 rc = -EPIPE;
1004 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1005 send_sig(SIGPIPE, current, 0);
1006 goto out;
1007 }
1008
1009 rc = -ENETUNREACH;
1010 if (!x25->neighbour)
1011 goto out;
1012
1013 if (usx25) {
1014 rc = -EINVAL;
1015 if (msg->msg_namelen < sizeof(sx25))
1016 goto out;
1017 memcpy(&sx25, usx25, sizeof(sx25));
1018 rc = -EISCONN;
1019 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1020 goto out;
1021 rc = -EINVAL;
1022 if (sx25.sx25_family != AF_X25)
1023 goto out;
1024 } else {
1025 /*
1026 * FIXME 1003.1g - if the socket is like this because
1027 * it has become closed (not started closed) we ought
1028 * to SIGPIPE, EPIPE;
1029 */
1030 rc = -ENOTCONN;
1031 if (sk->sk_state != TCP_ESTABLISHED)
1032 goto out;
1033
1034 sx25.sx25_family = AF_X25;
1035 sx25.sx25_addr = x25->dest_addr;
1036 }
1037
1038 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1039
1040 /* Build a packet */
1041 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1042
1043 if ((msg->msg_flags & MSG_OOB) && len > 32)
1044 len = 32;
1045
1046 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1047
1048 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1049 if (!skb)
1050 goto out;
1051 X25_SKB_CB(skb)->flags = msg->msg_flags;
1052
1053 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1054
1055 /*
1056 * Put the data on the end
1057 */
1058 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1059
1060 skb_reset_transport_header(skb);
1061 skb_put(skb, len);
1062
1063 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1064 if (rc)
1065 goto out_kfree_skb;
1066
1067 /*
1068 * If the Q BIT Include socket option is in force, the first
1069 * byte of the user data is the logical value of the Q Bit.
1070 */
1071 if (x25->qbitincl) {
1072 qbit = skb->data[0];
1073 skb_pull(skb, 1);
1074 }
1075
1076 /*
1077 * Push down the X.25 header
1078 */
1079 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1080
1081 if (msg->msg_flags & MSG_OOB) {
1082 if (x25->neighbour->extended) {
1083 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1084 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1085 *asmptr++ = (x25->lci >> 0) & 0xFF;
1086 *asmptr++ = X25_INTERRUPT;
1087 } else {
1088 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1089 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1090 *asmptr++ = (x25->lci >> 0) & 0xFF;
1091 *asmptr++ = X25_INTERRUPT;
1092 }
1093 } else {
1094 if (x25->neighbour->extended) {
1095 /* Build an Extended X.25 header */
1096 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1097 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1098 *asmptr++ = (x25->lci >> 0) & 0xFF;
1099 *asmptr++ = X25_DATA;
1100 *asmptr++ = X25_DATA;
1101 } else {
1102 /* Build an Standard X.25 header */
1103 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1104 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1105 *asmptr++ = (x25->lci >> 0) & 0xFF;
1106 *asmptr++ = X25_DATA;
1107 }
1108
1109 if (qbit)
1110 skb->data[0] |= X25_Q_BIT;
1111 }
1112
1113 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1114 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1115
1116 rc = -ENOTCONN;
1117 if (sk->sk_state != TCP_ESTABLISHED)
1118 goto out_kfree_skb;
1119
1120 if (msg->msg_flags & MSG_OOB)
1121 skb_queue_tail(&x25->interrupt_out_queue, skb);
1122 else {
1123 len = x25_output(sk, skb);
1124 if (len < 0)
1125 kfree_skb(skb);
1126 else if (x25->qbitincl)
1127 len++;
1128 }
1129
1130 /*
1131 * lock_sock() is currently only used to serialize this x25_kick()
1132 * against input-driven x25_kick() calls. It currently only blocks
1133 * incoming packets for this socket and does not protect against
1134 * any other socket state changes and is not called from anywhere
1135 * else. As x25_kick() cannot block and as long as all socket
1136 * operations are BKL-wrapped, we don't need take to care about
1137 * purging the backlog queue in x25_release().
1138 *
1139 * Using lock_sock() to protect all socket operations entirely
1140 * (and making the whole x25 stack SMP aware) unfortunately would
1141 * require major changes to {send,recv}msg and skb allocation methods.
1142 * -> 2.5 ;)
1143 */
1144 lock_sock(sk);
1145 x25_kick(sk);
1146 release_sock(sk);
1147 rc = len;
1148 out:
1149 return rc;
1150 out_kfree_skb:
1151 kfree_skb(skb);
1152 goto out;
1153 }
1154
1155
1156 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1157 struct msghdr *msg, size_t size,
1158 int flags)
1159 {
1160 struct sock *sk = sock->sk;
1161 struct x25_sock *x25 = x25_sk(sk);
1162 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1163 size_t copied;
1164 int qbit;
1165 struct sk_buff *skb;
1166 unsigned char *asmptr;
1167 int rc = -ENOTCONN;
1168
1169 /*
1170 * This works for seqpacket too. The receiver has ordered the queue for
1171 * us! We do one quick check first though
1172 */
1173 if (sk->sk_state != TCP_ESTABLISHED)
1174 goto out;
1175
1176 if (flags & MSG_OOB) {
1177 rc = -EINVAL;
1178 if (sock_flag(sk, SOCK_URGINLINE) ||
1179 !skb_peek(&x25->interrupt_in_queue))
1180 goto out;
1181
1182 skb = skb_dequeue(&x25->interrupt_in_queue);
1183
1184 skb_pull(skb, X25_STD_MIN_LEN);
1185
1186 /*
1187 * No Q bit information on Interrupt data.
1188 */
1189 if (x25->qbitincl) {
1190 asmptr = skb_push(skb, 1);
1191 *asmptr = 0x00;
1192 }
1193
1194 msg->msg_flags |= MSG_OOB;
1195 } else {
1196 /* Now we can treat all alike */
1197 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1198 flags & MSG_DONTWAIT, &rc);
1199 if (!skb)
1200 goto out;
1201
1202 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1203
1204 skb_pull(skb, x25->neighbour->extended ?
1205 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1206
1207 if (x25->qbitincl) {
1208 asmptr = skb_push(skb, 1);
1209 *asmptr = qbit;
1210 }
1211 }
1212
1213 skb_reset_transport_header(skb);
1214 copied = skb->len;
1215
1216 if (copied > size) {
1217 copied = size;
1218 msg->msg_flags |= MSG_TRUNC;
1219 }
1220
1221 /* Currently, each datagram always contains a complete record */
1222 msg->msg_flags |= MSG_EOR;
1223
1224 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1225 if (rc)
1226 goto out_free_dgram;
1227
1228 if (sx25) {
1229 sx25->sx25_family = AF_X25;
1230 sx25->sx25_addr = x25->dest_addr;
1231 }
1232
1233 msg->msg_namelen = sizeof(struct sockaddr_x25);
1234
1235 lock_sock(sk);
1236 x25_check_rbuf(sk);
1237 release_sock(sk);
1238 rc = copied;
1239 out_free_dgram:
1240 skb_free_datagram(sk, skb);
1241 out:
1242 return rc;
1243 }
1244
1245
1246 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1247 {
1248 struct sock *sk = sock->sk;
1249 struct x25_sock *x25 = x25_sk(sk);
1250 void __user *argp = (void __user *)arg;
1251 int rc;
1252
1253 switch (cmd) {
1254 case TIOCOUTQ: {
1255 int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1256
1257 if (amount < 0)
1258 amount = 0;
1259 rc = put_user(amount, (unsigned int __user *)argp);
1260 break;
1261 }
1262
1263 case TIOCINQ: {
1264 struct sk_buff *skb;
1265 int amount = 0;
1266 /*
1267 * These two are safe on a single CPU system as
1268 * only user tasks fiddle here
1269 */
1270 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1271 amount = skb->len;
1272 rc = put_user(amount, (unsigned int __user *)argp);
1273 break;
1274 }
1275
1276 case SIOCGSTAMP:
1277 rc = -EINVAL;
1278 if (sk)
1279 rc = sock_get_timestamp(sk,
1280 (struct timeval __user *)argp);
1281 break;
1282 case SIOCGSTAMPNS:
1283 rc = -EINVAL;
1284 if (sk)
1285 rc = sock_get_timestampns(sk,
1286 (struct timespec __user *)argp);
1287 break;
1288 case SIOCGIFADDR:
1289 case SIOCSIFADDR:
1290 case SIOCGIFDSTADDR:
1291 case SIOCSIFDSTADDR:
1292 case SIOCGIFBRDADDR:
1293 case SIOCSIFBRDADDR:
1294 case SIOCGIFNETMASK:
1295 case SIOCSIFNETMASK:
1296 case SIOCGIFMETRIC:
1297 case SIOCSIFMETRIC:
1298 rc = -EINVAL;
1299 break;
1300 case SIOCADDRT:
1301 case SIOCDELRT:
1302 rc = -EPERM;
1303 if (!capable(CAP_NET_ADMIN))
1304 break;
1305 rc = x25_route_ioctl(cmd, argp);
1306 break;
1307 case SIOCX25GSUBSCRIP:
1308 rc = x25_subscr_ioctl(cmd, argp);
1309 break;
1310 case SIOCX25SSUBSCRIP:
1311 rc = -EPERM;
1312 if (!capable(CAP_NET_ADMIN))
1313 break;
1314 rc = x25_subscr_ioctl(cmd, argp);
1315 break;
1316 case SIOCX25GFACILITIES: {
1317 struct x25_facilities fac = x25->facilities;
1318 rc = copy_to_user(argp, &fac,
1319 sizeof(fac)) ? -EFAULT : 0;
1320 break;
1321 }
1322
1323 case SIOCX25SFACILITIES: {
1324 struct x25_facilities facilities;
1325 rc = -EFAULT;
1326 if (copy_from_user(&facilities, argp,
1327 sizeof(facilities)))
1328 break;
1329 rc = -EINVAL;
1330 if (sk->sk_state != TCP_LISTEN &&
1331 sk->sk_state != TCP_CLOSE)
1332 break;
1333 if (facilities.pacsize_in < X25_PS16 ||
1334 facilities.pacsize_in > X25_PS4096)
1335 break;
1336 if (facilities.pacsize_out < X25_PS16 ||
1337 facilities.pacsize_out > X25_PS4096)
1338 break;
1339 if (facilities.winsize_in < 1 ||
1340 facilities.winsize_in > 127)
1341 break;
1342 if (facilities.throughput < 0x03 ||
1343 facilities.throughput > 0xDD)
1344 break;
1345 if (facilities.reverse &&
1346 (facilities.reverse | 0x81)!= 0x81)
1347 break;
1348 x25->facilities = facilities;
1349 rc = 0;
1350 break;
1351 }
1352
1353 case SIOCX25GDTEFACILITIES: {
1354 rc = copy_to_user(argp, &x25->dte_facilities,
1355 sizeof(x25->dte_facilities));
1356 if (rc)
1357 rc = -EFAULT;
1358 break;
1359 }
1360
1361 case SIOCX25SDTEFACILITIES: {
1362 struct x25_dte_facilities dtefacs;
1363 rc = -EFAULT;
1364 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1365 break;
1366 rc = -EINVAL;
1367 if (sk->sk_state != TCP_LISTEN &&
1368 sk->sk_state != TCP_CLOSE)
1369 break;
1370 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1371 break;
1372 if (dtefacs.calling_ae == NULL)
1373 break;
1374 if (dtefacs.called_len > X25_MAX_AE_LEN)
1375 break;
1376 if (dtefacs.called_ae == NULL)
1377 break;
1378 x25->dte_facilities = dtefacs;
1379 rc = 0;
1380 break;
1381 }
1382
1383 case SIOCX25GCALLUSERDATA: {
1384 struct x25_calluserdata cud = x25->calluserdata;
1385 rc = copy_to_user(argp, &cud,
1386 sizeof(cud)) ? -EFAULT : 0;
1387 break;
1388 }
1389
1390 case SIOCX25SCALLUSERDATA: {
1391 struct x25_calluserdata calluserdata;
1392
1393 rc = -EFAULT;
1394 if (copy_from_user(&calluserdata, argp,
1395 sizeof(calluserdata)))
1396 break;
1397 rc = -EINVAL;
1398 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1399 break;
1400 x25->calluserdata = calluserdata;
1401 rc = 0;
1402 break;
1403 }
1404
1405 case SIOCX25GCAUSEDIAG: {
1406 struct x25_causediag causediag;
1407 causediag = x25->causediag;
1408 rc = copy_to_user(argp, &causediag,
1409 sizeof(causediag)) ? -EFAULT : 0;
1410 break;
1411 }
1412
1413 case SIOCX25SCUDMATCHLEN: {
1414 struct x25_subaddr sub_addr;
1415 rc = -EINVAL;
1416 if(sk->sk_state != TCP_CLOSE)
1417 break;
1418 rc = -EFAULT;
1419 if (copy_from_user(&sub_addr, argp,
1420 sizeof(sub_addr)))
1421 break;
1422 rc = -EINVAL;
1423 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1424 break;
1425 x25->cudmatchlength = sub_addr.cudmatchlength;
1426 rc = 0;
1427 break;
1428 }
1429
1430 case SIOCX25CALLACCPTAPPRV: {
1431 rc = -EINVAL;
1432 if (sk->sk_state != TCP_CLOSE)
1433 break;
1434 x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1435 rc = 0;
1436 break;
1437 }
1438
1439 case SIOCX25SENDCALLACCPT: {
1440 rc = -EINVAL;
1441 if (sk->sk_state != TCP_ESTABLISHED)
1442 break;
1443 if (x25->accptapprv) /* must call accptapprv above */
1444 break;
1445 x25_write_internal(sk, X25_CALL_ACCEPTED);
1446 x25->state = X25_STATE_3;
1447 rc = 0;
1448 break;
1449 }
1450
1451 default:
1452 rc = -ENOIOCTLCMD;
1453 break;
1454 }
1455
1456 return rc;
1457 }
1458
1459 static struct net_proto_family x25_family_ops = {
1460 .family = AF_X25,
1461 .create = x25_create,
1462 .owner = THIS_MODULE,
1463 };
1464
1465 #ifdef CONFIG_COMPAT
1466 static int compat_x25_subscr_ioctl(unsigned int cmd,
1467 struct compat_x25_subscrip_struct __user *x25_subscr32)
1468 {
1469 struct compat_x25_subscrip_struct x25_subscr;
1470 struct x25_neigh *nb;
1471 struct net_device *dev;
1472 int rc = -EINVAL;
1473
1474 rc = -EFAULT;
1475 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1476 goto out;
1477
1478 rc = -EINVAL;
1479 dev = x25_dev_get(x25_subscr.device);
1480 if (dev == NULL)
1481 goto out;
1482
1483 nb = x25_get_neigh(dev);
1484 if (nb == NULL)
1485 goto out_dev_put;
1486
1487 dev_put(dev);
1488
1489 if (cmd == SIOCX25GSUBSCRIP) {
1490 x25_subscr.extended = nb->extended;
1491 x25_subscr.global_facil_mask = nb->global_facil_mask;
1492 rc = copy_to_user(x25_subscr32, &x25_subscr,
1493 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1494 } else {
1495 rc = -EINVAL;
1496 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1497 rc = 0;
1498 nb->extended = x25_subscr.extended;
1499 nb->global_facil_mask = x25_subscr.global_facil_mask;
1500 }
1501 }
1502 x25_neigh_put(nb);
1503 out:
1504 return rc;
1505 out_dev_put:
1506 dev_put(dev);
1507 goto out;
1508 }
1509
1510 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1511 unsigned long arg)
1512 {
1513 void __user *argp = compat_ptr(arg);
1514 struct sock *sk = sock->sk;
1515
1516 int rc = -ENOIOCTLCMD;
1517
1518 switch(cmd) {
1519 case TIOCOUTQ:
1520 case TIOCINQ:
1521 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1522 break;
1523 case SIOCGSTAMP:
1524 rc = -EINVAL;
1525 if (sk)
1526 rc = compat_sock_get_timestamp(sk,
1527 (struct timeval __user*)argp);
1528 break;
1529 case SIOCGSTAMPNS:
1530 rc = -EINVAL;
1531 if (sk)
1532 rc = compat_sock_get_timestampns(sk,
1533 (struct timespec __user*)argp);
1534 break;
1535 case SIOCGIFADDR:
1536 case SIOCSIFADDR:
1537 case SIOCGIFDSTADDR:
1538 case SIOCSIFDSTADDR:
1539 case SIOCGIFBRDADDR:
1540 case SIOCSIFBRDADDR:
1541 case SIOCGIFNETMASK:
1542 case SIOCSIFNETMASK:
1543 case SIOCGIFMETRIC:
1544 case SIOCSIFMETRIC:
1545 rc = -EINVAL;
1546 break;
1547 case SIOCADDRT:
1548 case SIOCDELRT:
1549 rc = -EPERM;
1550 if (!capable(CAP_NET_ADMIN))
1551 break;
1552 rc = x25_route_ioctl(cmd, argp);
1553 break;
1554 case SIOCX25GSUBSCRIP:
1555 rc = compat_x25_subscr_ioctl(cmd, argp);
1556 break;
1557 case SIOCX25SSUBSCRIP:
1558 rc = -EPERM;
1559 if (!capable(CAP_NET_ADMIN))
1560 break;
1561 rc = compat_x25_subscr_ioctl(cmd, argp);
1562 break;
1563 case SIOCX25GFACILITIES:
1564 case SIOCX25SFACILITIES:
1565 case SIOCX25GDTEFACILITIES:
1566 case SIOCX25SDTEFACILITIES:
1567 case SIOCX25GCALLUSERDATA:
1568 case SIOCX25SCALLUSERDATA:
1569 case SIOCX25GCAUSEDIAG:
1570 case SIOCX25SCUDMATCHLEN:
1571 case SIOCX25CALLACCPTAPPRV:
1572 case SIOCX25SENDCALLACCPT:
1573 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1574 break;
1575 default:
1576 rc = -ENOIOCTLCMD;
1577 break;
1578 }
1579 return rc;
1580 }
1581 #endif
1582
1583 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1584 .family = AF_X25,
1585 .owner = THIS_MODULE,
1586 .release = x25_release,
1587 .bind = x25_bind,
1588 .connect = x25_connect,
1589 .socketpair = sock_no_socketpair,
1590 .accept = x25_accept,
1591 .getname = x25_getname,
1592 .poll = datagram_poll,
1593 .ioctl = x25_ioctl,
1594 #ifdef CONFIG_COMPAT
1595 .compat_ioctl = compat_x25_ioctl,
1596 #endif
1597 .listen = x25_listen,
1598 .shutdown = sock_no_shutdown,
1599 .setsockopt = x25_setsockopt,
1600 .getsockopt = x25_getsockopt,
1601 .sendmsg = x25_sendmsg,
1602 .recvmsg = x25_recvmsg,
1603 .mmap = sock_no_mmap,
1604 .sendpage = sock_no_sendpage,
1605 };
1606
1607 SOCKOPS_WRAP(x25_proto, AF_X25);
1608
1609 static struct packet_type x25_packet_type = {
1610 .type = __constant_htons(ETH_P_X25),
1611 .func = x25_lapb_receive_frame,
1612 };
1613
1614 static struct notifier_block x25_dev_notifier = {
1615 .notifier_call = x25_device_event,
1616 };
1617
1618 void x25_kill_by_neigh(struct x25_neigh *nb)
1619 {
1620 struct sock *s;
1621 struct hlist_node *node;
1622
1623 write_lock_bh(&x25_list_lock);
1624
1625 sk_for_each(s, node, &x25_list)
1626 if (x25_sk(s)->neighbour == nb)
1627 x25_disconnect(s, ENETUNREACH, 0, 0);
1628
1629 write_unlock_bh(&x25_list_lock);
1630
1631 /* Remove any related forwards */
1632 x25_clear_forward_by_dev(nb->dev);
1633 }
1634
1635 static int __init x25_init(void)
1636 {
1637 int rc = proto_register(&x25_proto, 0);
1638
1639 if (rc != 0)
1640 goto out;
1641
1642 sock_register(&x25_family_ops);
1643
1644 dev_add_pack(&x25_packet_type);
1645
1646 register_netdevice_notifier(&x25_dev_notifier);
1647
1648 printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1649
1650 #ifdef CONFIG_SYSCTL
1651 x25_register_sysctl();
1652 #endif
1653 x25_proc_init();
1654 out:
1655 return rc;
1656 }
1657 module_init(x25_init);
1658
1659 static void __exit x25_exit(void)
1660 {
1661 x25_proc_exit();
1662 x25_link_free();
1663 x25_route_free();
1664
1665 #ifdef CONFIG_SYSCTL
1666 x25_unregister_sysctl();
1667 #endif
1668
1669 unregister_netdevice_notifier(&x25_dev_notifier);
1670
1671 dev_remove_pack(&x25_packet_type);
1672
1673 sock_unregister(AF_X25);
1674 proto_unregister(&x25_proto);
1675 }
1676 module_exit(x25_exit);
1677
1678 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1679 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1680 MODULE_LICENSE("GPL");
1681 MODULE_ALIAS_NETPROTO(PF_X25);
Tomato firmware and modifications.