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perf bpf: Move perf_event_output() from stdio.h to bpf.h
[linux/fpc-iii.git] / net / x25 / af_x25.c
blob5121729b8b631f45d81d3e0332b0d2e4346d3c5d
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 #define pr_fmt(fmt) "X25: " fmt
39
40 #include <linux/module.h>
41 #include <linux/capability.h>
42 #include <linux/errno.h>
43 #include <linux/kernel.h>
44 #include <linux/sched/signal.h>
45 #include <linux/timer.h>
46 #include <linux/string.h>
47 #include <linux/net.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_arp.h>
50 #include <linux/skbuff.h>
51 #include <linux/slab.h>
52 #include <net/sock.h>
53 #include <net/tcp_states.h>
54 #include <linux/uaccess.h>
55 #include <linux/fcntl.h>
56 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
57 #include <linux/notifier.h>
58 #include <linux/init.h>
59 #include <linux/compat.h>
60 #include <linux/ctype.h>
61
62 #include <net/x25.h>
63 #include <net/compat.h>
64
65 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
66 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
67 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
68 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
69 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
70 int sysctl_x25_forward = 0;
71
72 HLIST_HEAD(x25_list);
73 DEFINE_RWLOCK(x25_list_lock);
74
75 static const struct proto_ops x25_proto_ops;
76
77 static const struct x25_address null_x25_address = {" "};
78
79 #ifdef CONFIG_COMPAT
80 struct compat_x25_subscrip_struct {
81 char device[200-sizeof(compat_ulong_t)];
82 compat_ulong_t global_facil_mask;
83 compat_uint_t extended;
84 };
85 #endif
86
87
88 int x25_parse_address_block(struct sk_buff *skb,
89 struct x25_address *called_addr,
90 struct x25_address *calling_addr)
91 {
92 unsigned char len;
93 int needed;
94 int rc;
95
96 if (!pskb_may_pull(skb, 1)) {
97 /* packet has no address block */
98 rc = 0;
99 goto empty;
100 }
101
102 len = *skb->data;
103 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
104
105 if (!pskb_may_pull(skb, needed)) {
106 /* packet is too short to hold the addresses it claims
107 to hold */
108 rc = -1;
109 goto empty;
110 }
111
112 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
113
114 empty:
115 *called_addr->x25_addr = 0;
116 *calling_addr->x25_addr = 0;
117
118 return rc;
119 }
120
121
122 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
123 struct x25_address *calling_addr)
124 {
125 unsigned int called_len, calling_len;
126 char *called, *calling;
127 unsigned int i;
128
129 called_len = (*p >> 0) & 0x0F;
130 calling_len = (*p >> 4) & 0x0F;
131
132 called = called_addr->x25_addr;
133 calling = calling_addr->x25_addr;
134 p++;
135
136 for (i = 0; i < (called_len + calling_len); i++) {
137 if (i < called_len) {
138 if (i % 2 != 0) {
139 *called++ = ((*p >> 0) & 0x0F) + '0';
140 p++;
141 } else {
142 *called++ = ((*p >> 4) & 0x0F) + '0';
143 }
144 } else {
145 if (i % 2 != 0) {
146 *calling++ = ((*p >> 0) & 0x0F) + '0';
147 p++;
148 } else {
149 *calling++ = ((*p >> 4) & 0x0F) + '0';
150 }
151 }
152 }
153
154 *called = *calling = '\0';
155
156 return 1 + (called_len + calling_len + 1) / 2;
157 }
158
159 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
160 struct x25_address *calling_addr)
161 {
162 unsigned int called_len, calling_len;
163 char *called, *calling;
164 int i;
165
166 called = called_addr->x25_addr;
167 calling = calling_addr->x25_addr;
168
169 called_len = strlen(called);
170 calling_len = strlen(calling);
171
172 *p++ = (calling_len << 4) | (called_len << 0);
173
174 for (i = 0; i < (called_len + calling_len); i++) {
175 if (i < called_len) {
176 if (i % 2 != 0) {
177 *p |= (*called++ - '0') << 0;
178 p++;
179 } else {
180 *p = 0x00;
181 *p |= (*called++ - '0') << 4;
182 }
183 } else {
184 if (i % 2 != 0) {
185 *p |= (*calling++ - '0') << 0;
186 p++;
187 } else {
188 *p = 0x00;
189 *p |= (*calling++ - '0') << 4;
190 }
191 }
192 }
193
194 return 1 + (called_len + calling_len + 1) / 2;
195 }
196
197 /*
198 * Socket removal during an interrupt is now safe.
199 */
200 static void x25_remove_socket(struct sock *sk)
201 {
202 write_lock_bh(&x25_list_lock);
203 sk_del_node_init(sk);
204 write_unlock_bh(&x25_list_lock);
205 }
206
207 /*
208 * Kill all bound sockets on a dropped device.
209 */
210 static void x25_kill_by_device(struct net_device *dev)
211 {
212 struct sock *s;
213
214 write_lock_bh(&x25_list_lock);
215
216 sk_for_each(s, &x25_list)
217 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
218 x25_disconnect(s, ENETUNREACH, 0, 0);
219
220 write_unlock_bh(&x25_list_lock);
221 }
222
223 /*
224 * Handle device status changes.
225 */
226 static int x25_device_event(struct notifier_block *this, unsigned long event,
227 void *ptr)
228 {
229 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
230 struct x25_neigh *nb;
231
232 if (!net_eq(dev_net(dev), &init_net))
233 return NOTIFY_DONE;
234
235 if (dev->type == ARPHRD_X25
236 #if IS_ENABLED(CONFIG_LLC)
237 || dev->type == ARPHRD_ETHER
238 #endif
239 ) {
240 switch (event) {
241 case NETDEV_UP:
242 x25_link_device_up(dev);
243 break;
244 case NETDEV_GOING_DOWN:
245 nb = x25_get_neigh(dev);
246 if (nb) {
247 x25_terminate_link(nb);
248 x25_neigh_put(nb);
249 }
250 break;
251 case NETDEV_DOWN:
252 x25_kill_by_device(dev);
253 x25_route_device_down(dev);
254 x25_link_device_down(dev);
255 break;
256 }
257 }
258
259 return NOTIFY_DONE;
260 }
261
262 /*
263 * Add a socket to the bound sockets list.
264 */
265 static void x25_insert_socket(struct sock *sk)
266 {
267 write_lock_bh(&x25_list_lock);
268 sk_add_node(sk, &x25_list);
269 write_unlock_bh(&x25_list_lock);
270 }
271
272 /*
273 * Find a socket that wants to accept the Call Request we just
274 * received. Check the full list for an address/cud match.
275 * If no cuds match return the next_best thing, an address match.
276 * Note: if a listening socket has cud set it must only get calls
277 * with matching cud.
278 */
279 static struct sock *x25_find_listener(struct x25_address *addr,
280 struct sk_buff *skb)
281 {
282 struct sock *s;
283 struct sock *next_best;
284
285 read_lock_bh(&x25_list_lock);
286 next_best = NULL;
287
288 sk_for_each(s, &x25_list)
289 if ((!strcmp(addr->x25_addr,
290 x25_sk(s)->source_addr.x25_addr) ||
291 !strcmp(x25_sk(s)->source_addr.x25_addr,
292 null_x25_address.x25_addr)) &&
293 s->sk_state == TCP_LISTEN) {
294 /*
295 * Found a listening socket, now check the incoming
296 * call user data vs this sockets call user data
297 */
298 if (x25_sk(s)->cudmatchlength > 0 &&
299 skb->len >= x25_sk(s)->cudmatchlength) {
300 if((memcmp(x25_sk(s)->calluserdata.cuddata,
301 skb->data,
302 x25_sk(s)->cudmatchlength)) == 0) {
303 sock_hold(s);
304 goto found;
305 }
306 } else
307 next_best = s;
308 }
309 if (next_best) {
310 s = next_best;
311 sock_hold(s);
312 goto found;
313 }
314 s = NULL;
315 found:
316 read_unlock_bh(&x25_list_lock);
317 return s;
318 }
319
320 /*
321 * Find a connected X.25 socket given my LCI and neighbour.
322 */
323 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
324 {
325 struct sock *s;
326
327 sk_for_each(s, &x25_list)
328 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
329 sock_hold(s);
330 goto found;
331 }
332 s = NULL;
333 found:
334 return s;
335 }
336
337 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
338 {
339 struct sock *s;
340
341 read_lock_bh(&x25_list_lock);
342 s = __x25_find_socket(lci, nb);
343 read_unlock_bh(&x25_list_lock);
344 return s;
345 }
346
347 /*
348 * Find a unique LCI for a given device.
349 */
350 static unsigned int x25_new_lci(struct x25_neigh *nb)
351 {
352 unsigned int lci = 1;
353 struct sock *sk;
354
355 read_lock_bh(&x25_list_lock);
356
357 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
358 sock_put(sk);
359 if (++lci == 4096) {
360 lci = 0;
361 break;
362 }
363 }
364
365 read_unlock_bh(&x25_list_lock);
366 return lci;
367 }
368
369 /*
370 * Deferred destroy.
371 */
372 static void __x25_destroy_socket(struct sock *);
373
374 /*
375 * handler for deferred kills.
376 */
377 static void x25_destroy_timer(struct timer_list *t)
378 {
379 struct sock *sk = from_timer(sk, t, sk_timer);
380
381 x25_destroy_socket_from_timer(sk);
382 }
383
384 /*
385 * This is called from user mode and the timers. Thus it protects itself
386 * against interrupt users but doesn't worry about being called during
387 * work. Once it is removed from the queue no interrupt or bottom half
388 * will touch it and we are (fairly 8-) ) safe.
389 * Not static as it's used by the timer
390 */
391 static void __x25_destroy_socket(struct sock *sk)
392 {
393 struct sk_buff *skb;
394
395 x25_stop_heartbeat(sk);
396 x25_stop_timer(sk);
397
398 x25_remove_socket(sk);
399 x25_clear_queues(sk); /* Flush the queues */
400
401 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
402 if (skb->sk != sk) { /* A pending connection */
403 /*
404 * Queue the unaccepted socket for death
405 */
406 skb->sk->sk_state = TCP_LISTEN;
407 sock_set_flag(skb->sk, SOCK_DEAD);
408 x25_start_heartbeat(skb->sk);
409 x25_sk(skb->sk)->state = X25_STATE_0;
410 }
411
412 kfree_skb(skb);
413 }
414
415 if (sk_has_allocations(sk)) {
416 /* Defer: outstanding buffers */
417 sk->sk_timer.expires = jiffies + 10 * HZ;
418 sk->sk_timer.function = x25_destroy_timer;
419 add_timer(&sk->sk_timer);
420 } else {
421 /* drop last reference so sock_put will free */
422 __sock_put(sk);
423 }
424 }
425
426 void x25_destroy_socket_from_timer(struct sock *sk)
427 {
428 sock_hold(sk);
429 bh_lock_sock(sk);
430 __x25_destroy_socket(sk);
431 bh_unlock_sock(sk);
432 sock_put(sk);
433 }
434
435 /*
436 * Handling for system calls applied via the various interfaces to a
437 * X.25 socket object.
438 */
439
440 static int x25_setsockopt(struct socket *sock, int level, int optname,
441 char __user *optval, unsigned int optlen)
442 {
443 int opt;
444 struct sock *sk = sock->sk;
445 int rc = -ENOPROTOOPT;
446
447 if (level != SOL_X25 || optname != X25_QBITINCL)
448 goto out;
449
450 rc = -EINVAL;
451 if (optlen < sizeof(int))
452 goto out;
453
454 rc = -EFAULT;
455 if (get_user(opt, (int __user *)optval))
456 goto out;
457
458 if (opt)
459 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
460 else
461 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
462 rc = 0;
463 out:
464 return rc;
465 }
466
467 static int x25_getsockopt(struct socket *sock, int level, int optname,
468 char __user *optval, int __user *optlen)
469 {
470 struct sock *sk = sock->sk;
471 int val, len, rc = -ENOPROTOOPT;
472
473 if (level != SOL_X25 || optname != X25_QBITINCL)
474 goto out;
475
476 rc = -EFAULT;
477 if (get_user(len, optlen))
478 goto out;
479
480 len = min_t(unsigned int, len, sizeof(int));
481
482 rc = -EINVAL;
483 if (len < 0)
484 goto out;
485
486 rc = -EFAULT;
487 if (put_user(len, optlen))
488 goto out;
489
490 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
491 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
492 out:
493 return rc;
494 }
495
496 static int x25_listen(struct socket *sock, int backlog)
497 {
498 struct sock *sk = sock->sk;
499 int rc = -EOPNOTSUPP;
500
501 lock_sock(sk);
502 if (sk->sk_state != TCP_LISTEN) {
503 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
504 sk->sk_max_ack_backlog = backlog;
505 sk->sk_state = TCP_LISTEN;
506 rc = 0;
507 }
508 release_sock(sk);
509
510 return rc;
511 }
512
513 static struct proto x25_proto = {
514 .name = "X25",
515 .owner = THIS_MODULE,
516 .obj_size = sizeof(struct x25_sock),
517 };
518
519 static struct sock *x25_alloc_socket(struct net *net, int kern)
520 {
521 struct x25_sock *x25;
522 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
523
524 if (!sk)
525 goto out;
526
527 sock_init_data(NULL, sk);
528
529 x25 = x25_sk(sk);
530 skb_queue_head_init(&x25->ack_queue);
531 skb_queue_head_init(&x25->fragment_queue);
532 skb_queue_head_init(&x25->interrupt_in_queue);
533 skb_queue_head_init(&x25->interrupt_out_queue);
534 out:
535 return sk;
536 }
537
538 static int x25_create(struct net *net, struct socket *sock, int protocol,
539 int kern)
540 {
541 struct sock *sk;
542 struct x25_sock *x25;
543 int rc = -EAFNOSUPPORT;
544
545 if (!net_eq(net, &init_net))
546 goto out;
547
548 rc = -ESOCKTNOSUPPORT;
549 if (sock->type != SOCK_SEQPACKET)
550 goto out;
551
552 rc = -EINVAL;
553 if (protocol)
554 goto out;
555
556 rc = -ENOBUFS;
557 if ((sk = x25_alloc_socket(net, kern)) == NULL)
558 goto out;
559
560 x25 = x25_sk(sk);
561
562 sock_init_data(sock, sk);
563
564 x25_init_timers(sk);
565
566 sock->ops = &x25_proto_ops;
567 sk->sk_protocol = protocol;
568 sk->sk_backlog_rcv = x25_backlog_rcv;
569
570 x25->t21 = sysctl_x25_call_request_timeout;
571 x25->t22 = sysctl_x25_reset_request_timeout;
572 x25->t23 = sysctl_x25_clear_request_timeout;
573 x25->t2 = sysctl_x25_ack_holdback_timeout;
574 x25->state = X25_STATE_0;
575 x25->cudmatchlength = 0;
576 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
577 /* on call accept */
578
579 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
580 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
581 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
582 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
583 x25->facilities.throughput = 0; /* by default don't negotiate
584 throughput */
585 x25->facilities.reverse = X25_DEFAULT_REVERSE;
586 x25->dte_facilities.calling_len = 0;
587 x25->dte_facilities.called_len = 0;
588 memset(x25->dte_facilities.called_ae, '\0',
589 sizeof(x25->dte_facilities.called_ae));
590 memset(x25->dte_facilities.calling_ae, '\0',
591 sizeof(x25->dte_facilities.calling_ae));
592
593 rc = 0;
594 out:
595 return rc;
596 }
597
598 static struct sock *x25_make_new(struct sock *osk)
599 {
600 struct sock *sk = NULL;
601 struct x25_sock *x25, *ox25;
602
603 if (osk->sk_type != SOCK_SEQPACKET)
604 goto out;
605
606 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
607 goto out;
608
609 x25 = x25_sk(sk);
610
611 sk->sk_type = osk->sk_type;
612 sk->sk_priority = osk->sk_priority;
613 sk->sk_protocol = osk->sk_protocol;
614 sk->sk_rcvbuf = osk->sk_rcvbuf;
615 sk->sk_sndbuf = osk->sk_sndbuf;
616 sk->sk_state = TCP_ESTABLISHED;
617 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
618 sock_copy_flags(sk, osk);
619
620 ox25 = x25_sk(osk);
621 x25->t21 = ox25->t21;
622 x25->t22 = ox25->t22;
623 x25->t23 = ox25->t23;
624 x25->t2 = ox25->t2;
625 x25->flags = ox25->flags;
626 x25->facilities = ox25->facilities;
627 x25->dte_facilities = ox25->dte_facilities;
628 x25->cudmatchlength = ox25->cudmatchlength;
629
630 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
631 x25_init_timers(sk);
632 out:
633 return sk;
634 }
635
636 static int x25_release(struct socket *sock)
637 {
638 struct sock *sk = sock->sk;
639 struct x25_sock *x25;
640
641 if (!sk)
642 return 0;
643
644 x25 = x25_sk(sk);
645
646 sock_hold(sk);
647 lock_sock(sk);
648 switch (x25->state) {
649
650 case X25_STATE_0:
651 case X25_STATE_2:
652 x25_disconnect(sk, 0, 0, 0);
653 __x25_destroy_socket(sk);
654 goto out;
655
656 case X25_STATE_1:
657 case X25_STATE_3:
658 case X25_STATE_4:
659 x25_clear_queues(sk);
660 x25_write_internal(sk, X25_CLEAR_REQUEST);
661 x25_start_t23timer(sk);
662 x25->state = X25_STATE_2;
663 sk->sk_state = TCP_CLOSE;
664 sk->sk_shutdown |= SEND_SHUTDOWN;
665 sk->sk_state_change(sk);
666 sock_set_flag(sk, SOCK_DEAD);
667 sock_set_flag(sk, SOCK_DESTROY);
668 break;
669 }
670
671 sock_orphan(sk);
672 out:
673 release_sock(sk);
674 sock_put(sk);
675 return 0;
676 }
677
678 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
679 {
680 struct sock *sk = sock->sk;
681 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
682 int len, i, rc = 0;
683
684 if (!sock_flag(sk, SOCK_ZAPPED) ||
685 addr_len != sizeof(struct sockaddr_x25) ||
686 addr->sx25_family != AF_X25) {
687 rc = -EINVAL;
688 goto out;
689 }
690
691 /* check for the null_x25_address */
692 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
693
694 len = strlen(addr->sx25_addr.x25_addr);
695 for (i = 0; i < len; i++) {
696 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
697 rc = -EINVAL;
698 goto out;
699 }
700 }
701 }
702
703 lock_sock(sk);
704 x25_sk(sk)->source_addr = addr->sx25_addr;
705 x25_insert_socket(sk);
706 sock_reset_flag(sk, SOCK_ZAPPED);
707 release_sock(sk);
708 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
709 out:
710 return rc;
711 }
712
713 static int x25_wait_for_connection_establishment(struct sock *sk)
714 {
715 DECLARE_WAITQUEUE(wait, current);
716 int rc;
717
718 add_wait_queue_exclusive(sk_sleep(sk), &wait);
719 for (;;) {
720 __set_current_state(TASK_INTERRUPTIBLE);
721 rc = -ERESTARTSYS;
722 if (signal_pending(current))
723 break;
724 rc = sock_error(sk);
725 if (rc) {
726 sk->sk_socket->state = SS_UNCONNECTED;
727 break;
728 }
729 rc = 0;
730 if (sk->sk_state != TCP_ESTABLISHED) {
731 release_sock(sk);
732 schedule();
733 lock_sock(sk);
734 } else
735 break;
736 }
737 __set_current_state(TASK_RUNNING);
738 remove_wait_queue(sk_sleep(sk), &wait);
739 return rc;
740 }
741
742 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
743 int addr_len, int flags)
744 {
745 struct sock *sk = sock->sk;
746 struct x25_sock *x25 = x25_sk(sk);
747 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
748 struct x25_route *rt;
749 int rc = 0;
750
751 lock_sock(sk);
752 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
753 sock->state = SS_CONNECTED;
754 goto out; /* Connect completed during a ERESTARTSYS event */
755 }
756
757 rc = -ECONNREFUSED;
758 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
759 sock->state = SS_UNCONNECTED;
760 goto out;
761 }
762
763 rc = -EISCONN; /* No reconnect on a seqpacket socket */
764 if (sk->sk_state == TCP_ESTABLISHED)
765 goto out;
766
767 sk->sk_state = TCP_CLOSE;
768 sock->state = SS_UNCONNECTED;
769
770 rc = -EINVAL;
771 if (addr_len != sizeof(struct sockaddr_x25) ||
772 addr->sx25_family != AF_X25)
773 goto out;
774
775 rc = -ENETUNREACH;
776 rt = x25_get_route(&addr->sx25_addr);
777 if (!rt)
778 goto out;
779
780 x25->neighbour = x25_get_neigh(rt->dev);
781 if (!x25->neighbour)
782 goto out_put_route;
783
784 x25_limit_facilities(&x25->facilities, x25->neighbour);
785
786 x25->lci = x25_new_lci(x25->neighbour);
787 if (!x25->lci)
788 goto out_put_neigh;
789
790 rc = -EINVAL;
791 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
792 goto out_put_neigh;
793
794 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
795 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
796
797 x25->dest_addr = addr->sx25_addr;
798
799 /* Move to connecting socket, start sending Connect Requests */
800 sock->state = SS_CONNECTING;
801 sk->sk_state = TCP_SYN_SENT;
802
803 x25->state = X25_STATE_1;
804
805 x25_write_internal(sk, X25_CALL_REQUEST);
806
807 x25_start_heartbeat(sk);
808 x25_start_t21timer(sk);
809
810 /* Now the loop */
811 rc = -EINPROGRESS;
812 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
813 goto out_put_neigh;
814
815 rc = x25_wait_for_connection_establishment(sk);
816 if (rc)
817 goto out_put_neigh;
818
819 sock->state = SS_CONNECTED;
820 rc = 0;
821 out_put_neigh:
822 if (rc)
823 x25_neigh_put(x25->neighbour);
824 out_put_route:
825 x25_route_put(rt);
826 out:
827 release_sock(sk);
828 return rc;
829 }
830
831 static int x25_wait_for_data(struct sock *sk, long timeout)
832 {
833 DECLARE_WAITQUEUE(wait, current);
834 int rc = 0;
835
836 add_wait_queue_exclusive(sk_sleep(sk), &wait);
837 for (;;) {
838 __set_current_state(TASK_INTERRUPTIBLE);
839 if (sk->sk_shutdown & RCV_SHUTDOWN)
840 break;
841 rc = -ERESTARTSYS;
842 if (signal_pending(current))
843 break;
844 rc = -EAGAIN;
845 if (!timeout)
846 break;
847 rc = 0;
848 if (skb_queue_empty(&sk->sk_receive_queue)) {
849 release_sock(sk);
850 timeout = schedule_timeout(timeout);
851 lock_sock(sk);
852 } else
853 break;
854 }
855 __set_current_state(TASK_RUNNING);
856 remove_wait_queue(sk_sleep(sk), &wait);
857 return rc;
858 }
859
860 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
861 bool kern)
862 {
863 struct sock *sk = sock->sk;
864 struct sock *newsk;
865 struct sk_buff *skb;
866 int rc = -EINVAL;
867
868 if (!sk)
869 goto out;
870
871 rc = -EOPNOTSUPP;
872 if (sk->sk_type != SOCK_SEQPACKET)
873 goto out;
874
875 lock_sock(sk);
876 rc = -EINVAL;
877 if (sk->sk_state != TCP_LISTEN)
878 goto out2;
879
880 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
881 if (rc)
882 goto out2;
883 skb = skb_dequeue(&sk->sk_receive_queue);
884 rc = -EINVAL;
885 if (!skb->sk)
886 goto out2;
887 newsk = skb->sk;
888 sock_graft(newsk, newsock);
889
890 /* Now attach up the new socket */
891 skb->sk = NULL;
892 kfree_skb(skb);
893 sk->sk_ack_backlog--;
894 newsock->state = SS_CONNECTED;
895 rc = 0;
896 out2:
897 release_sock(sk);
898 out:
899 return rc;
900 }
901
902 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
903 int peer)
904 {
905 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
906 struct sock *sk = sock->sk;
907 struct x25_sock *x25 = x25_sk(sk);
908 int rc = 0;
909
910 if (peer) {
911 if (sk->sk_state != TCP_ESTABLISHED) {
912 rc = -ENOTCONN;
913 goto out;
914 }
915 sx25->sx25_addr = x25->dest_addr;
916 } else
917 sx25->sx25_addr = x25->source_addr;
918
919 sx25->sx25_family = AF_X25;
920 rc = sizeof(*sx25);
921
922 out:
923 return rc;
924 }
925
926 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
927 unsigned int lci)
928 {
929 struct sock *sk;
930 struct sock *make;
931 struct x25_sock *makex25;
932 struct x25_address source_addr, dest_addr;
933 struct x25_facilities facilities;
934 struct x25_dte_facilities dte_facilities;
935 int len, addr_len, rc;
936
937 /*
938 * Remove the LCI and frame type.
939 */
940 skb_pull(skb, X25_STD_MIN_LEN);
941
942 /*
943 * Extract the X.25 addresses and convert them to ASCII strings,
944 * and remove them.
945 *
946 * Address block is mandatory in call request packets
947 */
948 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
949 if (addr_len <= 0)
950 goto out_clear_request;
951 skb_pull(skb, addr_len);
952
953 /*
954 * Get the length of the facilities, skip past them for the moment
955 * get the call user data because this is needed to determine
956 * the correct listener
957 *
958 * Facilities length is mandatory in call request packets
959 */
960 if (!pskb_may_pull(skb, 1))
961 goto out_clear_request;
962 len = skb->data[0] + 1;
963 if (!pskb_may_pull(skb, len))
964 goto out_clear_request;
965 skb_pull(skb,len);
966
967 /*
968 * Ensure that the amount of call user data is valid.
969 */
970 if (skb->len > X25_MAX_CUD_LEN)
971 goto out_clear_request;
972
973 /*
974 * Get all the call user data so it can be used in
975 * x25_find_listener and skb_copy_from_linear_data up ahead.
976 */
977 if (!pskb_may_pull(skb, skb->len))
978 goto out_clear_request;
979
980 /*
981 * Find a listener for the particular address/cud pair.
982 */
983 sk = x25_find_listener(&source_addr,skb);
984 skb_push(skb,len);
985
986 if (sk != NULL && sk_acceptq_is_full(sk)) {
987 goto out_sock_put;
988 }
989
990 /*
991 * We dont have any listeners for this incoming call.
992 * Try forwarding it.
993 */
994 if (sk == NULL) {
995 skb_push(skb, addr_len + X25_STD_MIN_LEN);
996 if (sysctl_x25_forward &&
997 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
998 {
999 /* Call was forwarded, dont process it any more */
1000 kfree_skb(skb);
1001 rc = 1;
1002 goto out;
1003 } else {
1004 /* No listeners, can't forward, clear the call */
1005 goto out_clear_request;
1006 }
1007 }
1008
1009 /*
1010 * Try to reach a compromise on the requested facilities.
1011 */
1012 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1013 if (len == -1)
1014 goto out_sock_put;
1015
1016 /*
1017 * current neighbour/link might impose additional limits
1018 * on certain facilties
1019 */
1020
1021 x25_limit_facilities(&facilities, nb);
1022
1023 /*
1024 * Try to create a new socket.
1025 */
1026 make = x25_make_new(sk);
1027 if (!make)
1028 goto out_sock_put;
1029
1030 /*
1031 * Remove the facilities
1032 */
1033 skb_pull(skb, len);
1034
1035 skb->sk = make;
1036 make->sk_state = TCP_ESTABLISHED;
1037
1038 makex25 = x25_sk(make);
1039 makex25->lci = lci;
1040 makex25->dest_addr = dest_addr;
1041 makex25->source_addr = source_addr;
1042 makex25->neighbour = nb;
1043 makex25->facilities = facilities;
1044 makex25->dte_facilities= dte_facilities;
1045 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1046 /* ensure no reverse facil on accept */
1047 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1048 /* ensure no calling address extension on accept */
1049 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1050 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1051
1052 /* Normally all calls are accepted immediately */
1053 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1054 x25_write_internal(make, X25_CALL_ACCEPTED);
1055 makex25->state = X25_STATE_3;
1056 }
1057
1058 /*
1059 * Incoming Call User Data.
1060 */
1061 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1062 makex25->calluserdata.cudlength = skb->len;
1063
1064 sk->sk_ack_backlog++;
1065
1066 x25_insert_socket(make);
1067
1068 skb_queue_head(&sk->sk_receive_queue, skb);
1069
1070 x25_start_heartbeat(make);
1071
1072 if (!sock_flag(sk, SOCK_DEAD))
1073 sk->sk_data_ready(sk);
1074 rc = 1;
1075 sock_put(sk);
1076 out:
1077 return rc;
1078 out_sock_put:
1079 sock_put(sk);
1080 out_clear_request:
1081 rc = 0;
1082 x25_transmit_clear_request(nb, lci, 0x01);
1083 goto out;
1084 }
1085
1086 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1087 {
1088 struct sock *sk = sock->sk;
1089 struct x25_sock *x25 = x25_sk(sk);
1090 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1091 struct sockaddr_x25 sx25;
1092 struct sk_buff *skb;
1093 unsigned char *asmptr;
1094 int noblock = msg->msg_flags & MSG_DONTWAIT;
1095 size_t size;
1096 int qbit = 0, rc = -EINVAL;
1097
1098 lock_sock(sk);
1099 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1100 goto out;
1101
1102 /* we currently don't support segmented records at the user interface */
1103 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1104 goto out;
1105
1106 rc = -EADDRNOTAVAIL;
1107 if (sock_flag(sk, SOCK_ZAPPED))
1108 goto out;
1109
1110 rc = -EPIPE;
1111 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1112 send_sig(SIGPIPE, current, 0);
1113 goto out;
1114 }
1115
1116 rc = -ENETUNREACH;
1117 if (!x25->neighbour)
1118 goto out;
1119
1120 if (usx25) {
1121 rc = -EINVAL;
1122 if (msg->msg_namelen < sizeof(sx25))
1123 goto out;
1124 memcpy(&sx25, usx25, sizeof(sx25));
1125 rc = -EISCONN;
1126 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1127 goto out;
1128 rc = -EINVAL;
1129 if (sx25.sx25_family != AF_X25)
1130 goto out;
1131 } else {
1132 /*
1133 * FIXME 1003.1g - if the socket is like this because
1134 * it has become closed (not started closed) we ought
1135 * to SIGPIPE, EPIPE;
1136 */
1137 rc = -ENOTCONN;
1138 if (sk->sk_state != TCP_ESTABLISHED)
1139 goto out;
1140
1141 sx25.sx25_family = AF_X25;
1142 sx25.sx25_addr = x25->dest_addr;
1143 }
1144
1145 /* Sanity check the packet size */
1146 if (len > 65535) {
1147 rc = -EMSGSIZE;
1148 goto out;
1149 }
1150
1151 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1152
1153 /* Build a packet */
1154 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1155
1156 if ((msg->msg_flags & MSG_OOB) && len > 32)
1157 len = 32;
1158
1159 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1160
1161 release_sock(sk);
1162 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1163 lock_sock(sk);
1164 if (!skb)
1165 goto out;
1166 X25_SKB_CB(skb)->flags = msg->msg_flags;
1167
1168 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1169
1170 /*
1171 * Put the data on the end
1172 */
1173 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1174
1175 skb_reset_transport_header(skb);
1176 skb_put(skb, len);
1177
1178 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1179 if (rc)
1180 goto out_kfree_skb;
1181
1182 /*
1183 * If the Q BIT Include socket option is in force, the first
1184 * byte of the user data is the logical value of the Q Bit.
1185 */
1186 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1187 if (!pskb_may_pull(skb, 1))
1188 goto out_kfree_skb;
1189
1190 qbit = skb->data[0];
1191 skb_pull(skb, 1);
1192 }
1193
1194 /*
1195 * Push down the X.25 header
1196 */
1197 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1198
1199 if (msg->msg_flags & MSG_OOB) {
1200 if (x25->neighbour->extended) {
1201 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1202 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1203 *asmptr++ = (x25->lci >> 0) & 0xFF;
1204 *asmptr++ = X25_INTERRUPT;
1205 } else {
1206 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1207 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1208 *asmptr++ = (x25->lci >> 0) & 0xFF;
1209 *asmptr++ = X25_INTERRUPT;
1210 }
1211 } else {
1212 if (x25->neighbour->extended) {
1213 /* Build an Extended X.25 header */
1214 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1215 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1216 *asmptr++ = (x25->lci >> 0) & 0xFF;
1217 *asmptr++ = X25_DATA;
1218 *asmptr++ = X25_DATA;
1219 } else {
1220 /* Build an Standard X.25 header */
1221 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1222 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1223 *asmptr++ = (x25->lci >> 0) & 0xFF;
1224 *asmptr++ = X25_DATA;
1225 }
1226
1227 if (qbit)
1228 skb->data[0] |= X25_Q_BIT;
1229 }
1230
1231 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1232 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1233
1234 rc = -ENOTCONN;
1235 if (sk->sk_state != TCP_ESTABLISHED)
1236 goto out_kfree_skb;
1237
1238 if (msg->msg_flags & MSG_OOB)
1239 skb_queue_tail(&x25->interrupt_out_queue, skb);
1240 else {
1241 rc = x25_output(sk, skb);
1242 len = rc;
1243 if (rc < 0)
1244 kfree_skb(skb);
1245 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1246 len++;
1247 }
1248
1249 x25_kick(sk);
1250 rc = len;
1251 out:
1252 release_sock(sk);
1253 return rc;
1254 out_kfree_skb:
1255 kfree_skb(skb);
1256 goto out;
1257 }
1258
1259
1260 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1261 int flags)
1262 {
1263 struct sock *sk = sock->sk;
1264 struct x25_sock *x25 = x25_sk(sk);
1265 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1266 size_t copied;
1267 int qbit, header_len;
1268 struct sk_buff *skb;
1269 unsigned char *asmptr;
1270 int rc = -ENOTCONN;
1271
1272 lock_sock(sk);
1273
1274 if (x25->neighbour == NULL)
1275 goto out;
1276
1277 header_len = x25->neighbour->extended ?
1278 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1279
1280 /*
1281 * This works for seqpacket too. The receiver has ordered the queue for
1282 * us! We do one quick check first though
1283 */
1284 if (sk->sk_state != TCP_ESTABLISHED)
1285 goto out;
1286
1287 if (flags & MSG_OOB) {
1288 rc = -EINVAL;
1289 if (sock_flag(sk, SOCK_URGINLINE) ||
1290 !skb_peek(&x25->interrupt_in_queue))
1291 goto out;
1292
1293 skb = skb_dequeue(&x25->interrupt_in_queue);
1294
1295 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1296 goto out_free_dgram;
1297
1298 skb_pull(skb, X25_STD_MIN_LEN);
1299
1300 /*
1301 * No Q bit information on Interrupt data.
1302 */
1303 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1304 asmptr = skb_push(skb, 1);
1305 *asmptr = 0x00;
1306 }
1307
1308 msg->msg_flags |= MSG_OOB;
1309 } else {
1310 /* Now we can treat all alike */
1311 release_sock(sk);
1312 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1313 flags & MSG_DONTWAIT, &rc);
1314 lock_sock(sk);
1315 if (!skb)
1316 goto out;
1317
1318 if (!pskb_may_pull(skb, header_len))
1319 goto out_free_dgram;
1320
1321 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1322
1323 skb_pull(skb, header_len);
1324
1325 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1326 asmptr = skb_push(skb, 1);
1327 *asmptr = qbit;
1328 }
1329 }
1330
1331 skb_reset_transport_header(skb);
1332 copied = skb->len;
1333
1334 if (copied > size) {
1335 copied = size;
1336 msg->msg_flags |= MSG_TRUNC;
1337 }
1338
1339 /* Currently, each datagram always contains a complete record */
1340 msg->msg_flags |= MSG_EOR;
1341
1342 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1343 if (rc)
1344 goto out_free_dgram;
1345
1346 if (sx25) {
1347 sx25->sx25_family = AF_X25;
1348 sx25->sx25_addr = x25->dest_addr;
1349 msg->msg_namelen = sizeof(*sx25);
1350 }
1351
1352 x25_check_rbuf(sk);
1353 rc = copied;
1354 out_free_dgram:
1355 skb_free_datagram(sk, skb);
1356 out:
1357 release_sock(sk);
1358 return rc;
1359 }
1360
1361
1362 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1363 {
1364 struct sock *sk = sock->sk;
1365 struct x25_sock *x25 = x25_sk(sk);
1366 void __user *argp = (void __user *)arg;
1367 int rc;
1368
1369 switch (cmd) {
1370 case TIOCOUTQ: {
1371 int amount;
1372
1373 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1374 if (amount < 0)
1375 amount = 0;
1376 rc = put_user(amount, (unsigned int __user *)argp);
1377 break;
1378 }
1379
1380 case TIOCINQ: {
1381 struct sk_buff *skb;
1382 int amount = 0;
1383 /*
1384 * These two are safe on a single CPU system as
1385 * only user tasks fiddle here
1386 */
1387 lock_sock(sk);
1388 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1389 amount = skb->len;
1390 release_sock(sk);
1391 rc = put_user(amount, (unsigned int __user *)argp);
1392 break;
1393 }
1394
1395 case SIOCGSTAMP:
1396 rc = -EINVAL;
1397 if (sk)
1398 rc = sock_get_timestamp(sk,
1399 (struct timeval __user *)argp);
1400 break;
1401 case SIOCGSTAMPNS:
1402 rc = -EINVAL;
1403 if (sk)
1404 rc = sock_get_timestampns(sk,
1405 (struct timespec __user *)argp);
1406 break;
1407 case SIOCGIFADDR:
1408 case SIOCSIFADDR:
1409 case SIOCGIFDSTADDR:
1410 case SIOCSIFDSTADDR:
1411 case SIOCGIFBRDADDR:
1412 case SIOCSIFBRDADDR:
1413 case SIOCGIFNETMASK:
1414 case SIOCSIFNETMASK:
1415 case SIOCGIFMETRIC:
1416 case SIOCSIFMETRIC:
1417 rc = -EINVAL;
1418 break;
1419 case SIOCADDRT:
1420 case SIOCDELRT:
1421 rc = -EPERM;
1422 if (!capable(CAP_NET_ADMIN))
1423 break;
1424 rc = x25_route_ioctl(cmd, argp);
1425 break;
1426 case SIOCX25GSUBSCRIP:
1427 rc = x25_subscr_ioctl(cmd, argp);
1428 break;
1429 case SIOCX25SSUBSCRIP:
1430 rc = -EPERM;
1431 if (!capable(CAP_NET_ADMIN))
1432 break;
1433 rc = x25_subscr_ioctl(cmd, argp);
1434 break;
1435 case SIOCX25GFACILITIES: {
1436 lock_sock(sk);
1437 rc = copy_to_user(argp, &x25->facilities,
1438 sizeof(x25->facilities))
1439 ? -EFAULT : 0;
1440 release_sock(sk);
1441 break;
1442 }
1443
1444 case SIOCX25SFACILITIES: {
1445 struct x25_facilities facilities;
1446 rc = -EFAULT;
1447 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1448 break;
1449 rc = -EINVAL;
1450 lock_sock(sk);
1451 if (sk->sk_state != TCP_LISTEN &&
1452 sk->sk_state != TCP_CLOSE)
1453 goto out_fac_release;
1454 if (facilities.pacsize_in < X25_PS16 ||
1455 facilities.pacsize_in > X25_PS4096)
1456 goto out_fac_release;
1457 if (facilities.pacsize_out < X25_PS16 ||
1458 facilities.pacsize_out > X25_PS4096)
1459 goto out_fac_release;
1460 if (facilities.winsize_in < 1 ||
1461 facilities.winsize_in > 127)
1462 goto out_fac_release;
1463 if (facilities.throughput) {
1464 int out = facilities.throughput & 0xf0;
1465 int in = facilities.throughput & 0x0f;
1466 if (!out)
1467 facilities.throughput |=
1468 X25_DEFAULT_THROUGHPUT << 4;
1469 else if (out < 0x30 || out > 0xD0)
1470 goto out_fac_release;
1471 if (!in)
1472 facilities.throughput |=
1473 X25_DEFAULT_THROUGHPUT;
1474 else if (in < 0x03 || in > 0x0D)
1475 goto out_fac_release;
1476 }
1477 if (facilities.reverse &&
1478 (facilities.reverse & 0x81) != 0x81)
1479 goto out_fac_release;
1480 x25->facilities = facilities;
1481 rc = 0;
1482 out_fac_release:
1483 release_sock(sk);
1484 break;
1485 }
1486
1487 case SIOCX25GDTEFACILITIES: {
1488 lock_sock(sk);
1489 rc = copy_to_user(argp, &x25->dte_facilities,
1490 sizeof(x25->dte_facilities));
1491 release_sock(sk);
1492 if (rc)
1493 rc = -EFAULT;
1494 break;
1495 }
1496
1497 case SIOCX25SDTEFACILITIES: {
1498 struct x25_dte_facilities dtefacs;
1499 rc = -EFAULT;
1500 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1501 break;
1502 rc = -EINVAL;
1503 lock_sock(sk);
1504 if (sk->sk_state != TCP_LISTEN &&
1505 sk->sk_state != TCP_CLOSE)
1506 goto out_dtefac_release;
1507 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1508 goto out_dtefac_release;
1509 if (dtefacs.called_len > X25_MAX_AE_LEN)
1510 goto out_dtefac_release;
1511 x25->dte_facilities = dtefacs;
1512 rc = 0;
1513 out_dtefac_release:
1514 release_sock(sk);
1515 break;
1516 }
1517
1518 case SIOCX25GCALLUSERDATA: {
1519 lock_sock(sk);
1520 rc = copy_to_user(argp, &x25->calluserdata,
1521 sizeof(x25->calluserdata))
1522 ? -EFAULT : 0;
1523 release_sock(sk);
1524 break;
1525 }
1526
1527 case SIOCX25SCALLUSERDATA: {
1528 struct x25_calluserdata calluserdata;
1529
1530 rc = -EFAULT;
1531 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1532 break;
1533 rc = -EINVAL;
1534 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1535 break;
1536 lock_sock(sk);
1537 x25->calluserdata = calluserdata;
1538 release_sock(sk);
1539 rc = 0;
1540 break;
1541 }
1542
1543 case SIOCX25GCAUSEDIAG: {
1544 lock_sock(sk);
1545 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1546 ? -EFAULT : 0;
1547 release_sock(sk);
1548 break;
1549 }
1550
1551 case SIOCX25SCAUSEDIAG: {
1552 struct x25_causediag causediag;
1553 rc = -EFAULT;
1554 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1555 break;
1556 lock_sock(sk);
1557 x25->causediag = causediag;
1558 release_sock(sk);
1559 rc = 0;
1560 break;
1561
1562 }
1563
1564 case SIOCX25SCUDMATCHLEN: {
1565 struct x25_subaddr sub_addr;
1566 rc = -EINVAL;
1567 lock_sock(sk);
1568 if(sk->sk_state != TCP_CLOSE)
1569 goto out_cud_release;
1570 rc = -EFAULT;
1571 if (copy_from_user(&sub_addr, argp,
1572 sizeof(sub_addr)))
1573 goto out_cud_release;
1574 rc = -EINVAL;
1575 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1576 goto out_cud_release;
1577 x25->cudmatchlength = sub_addr.cudmatchlength;
1578 rc = 0;
1579 out_cud_release:
1580 release_sock(sk);
1581 break;
1582 }
1583
1584 case SIOCX25CALLACCPTAPPRV: {
1585 rc = -EINVAL;
1586 lock_sock(sk);
1587 if (sk->sk_state == TCP_CLOSE) {
1588 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1589 rc = 0;
1590 }
1591 release_sock(sk);
1592 break;
1593 }
1594
1595 case SIOCX25SENDCALLACCPT: {
1596 rc = -EINVAL;
1597 lock_sock(sk);
1598 if (sk->sk_state != TCP_ESTABLISHED)
1599 goto out_sendcallaccpt_release;
1600 /* must call accptapprv above */
1601 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1602 goto out_sendcallaccpt_release;
1603 x25_write_internal(sk, X25_CALL_ACCEPTED);
1604 x25->state = X25_STATE_3;
1605 rc = 0;
1606 out_sendcallaccpt_release:
1607 release_sock(sk);
1608 break;
1609 }
1610
1611 default:
1612 rc = -ENOIOCTLCMD;
1613 break;
1614 }
1615
1616 return rc;
1617 }
1618
1619 static const struct net_proto_family x25_family_ops = {
1620 .family = AF_X25,
1621 .create = x25_create,
1622 .owner = THIS_MODULE,
1623 };
1624
1625 #ifdef CONFIG_COMPAT
1626 static int compat_x25_subscr_ioctl(unsigned int cmd,
1627 struct compat_x25_subscrip_struct __user *x25_subscr32)
1628 {
1629 struct compat_x25_subscrip_struct x25_subscr;
1630 struct x25_neigh *nb;
1631 struct net_device *dev;
1632 int rc = -EINVAL;
1633
1634 rc = -EFAULT;
1635 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1636 goto out;
1637
1638 rc = -EINVAL;
1639 dev = x25_dev_get(x25_subscr.device);
1640 if (dev == NULL)
1641 goto out;
1642
1643 nb = x25_get_neigh(dev);
1644 if (nb == NULL)
1645 goto out_dev_put;
1646
1647 dev_put(dev);
1648
1649 if (cmd == SIOCX25GSUBSCRIP) {
1650 read_lock_bh(&x25_neigh_list_lock);
1651 x25_subscr.extended = nb->extended;
1652 x25_subscr.global_facil_mask = nb->global_facil_mask;
1653 read_unlock_bh(&x25_neigh_list_lock);
1654 rc = copy_to_user(x25_subscr32, &x25_subscr,
1655 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1656 } else {
1657 rc = -EINVAL;
1658 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1659 rc = 0;
1660 write_lock_bh(&x25_neigh_list_lock);
1661 nb->extended = x25_subscr.extended;
1662 nb->global_facil_mask = x25_subscr.global_facil_mask;
1663 write_unlock_bh(&x25_neigh_list_lock);
1664 }
1665 }
1666 x25_neigh_put(nb);
1667 out:
1668 return rc;
1669 out_dev_put:
1670 dev_put(dev);
1671 goto out;
1672 }
1673
1674 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1675 unsigned long arg)
1676 {
1677 void __user *argp = compat_ptr(arg);
1678 struct sock *sk = sock->sk;
1679
1680 int rc = -ENOIOCTLCMD;
1681
1682 switch(cmd) {
1683 case TIOCOUTQ:
1684 case TIOCINQ:
1685 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1686 break;
1687 case SIOCGSTAMP:
1688 rc = -EINVAL;
1689 if (sk)
1690 rc = compat_sock_get_timestamp(sk,
1691 (struct timeval __user*)argp);
1692 break;
1693 case SIOCGSTAMPNS:
1694 rc = -EINVAL;
1695 if (sk)
1696 rc = compat_sock_get_timestampns(sk,
1697 (struct timespec __user*)argp);
1698 break;
1699 case SIOCGIFADDR:
1700 case SIOCSIFADDR:
1701 case SIOCGIFDSTADDR:
1702 case SIOCSIFDSTADDR:
1703 case SIOCGIFBRDADDR:
1704 case SIOCSIFBRDADDR:
1705 case SIOCGIFNETMASK:
1706 case SIOCSIFNETMASK:
1707 case SIOCGIFMETRIC:
1708 case SIOCSIFMETRIC:
1709 rc = -EINVAL;
1710 break;
1711 case SIOCADDRT:
1712 case SIOCDELRT:
1713 rc = -EPERM;
1714 if (!capable(CAP_NET_ADMIN))
1715 break;
1716 rc = x25_route_ioctl(cmd, argp);
1717 break;
1718 case SIOCX25GSUBSCRIP:
1719 rc = compat_x25_subscr_ioctl(cmd, argp);
1720 break;
1721 case SIOCX25SSUBSCRIP:
1722 rc = -EPERM;
1723 if (!capable(CAP_NET_ADMIN))
1724 break;
1725 rc = compat_x25_subscr_ioctl(cmd, argp);
1726 break;
1727 case SIOCX25GFACILITIES:
1728 case SIOCX25SFACILITIES:
1729 case SIOCX25GDTEFACILITIES:
1730 case SIOCX25SDTEFACILITIES:
1731 case SIOCX25GCALLUSERDATA:
1732 case SIOCX25SCALLUSERDATA:
1733 case SIOCX25GCAUSEDIAG:
1734 case SIOCX25SCAUSEDIAG:
1735 case SIOCX25SCUDMATCHLEN:
1736 case SIOCX25CALLACCPTAPPRV:
1737 case SIOCX25SENDCALLACCPT:
1738 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1739 break;
1740 default:
1741 rc = -ENOIOCTLCMD;
1742 break;
1743 }
1744 return rc;
1745 }
1746 #endif
1747
1748 static const struct proto_ops x25_proto_ops = {
1749 .family = AF_X25,
1750 .owner = THIS_MODULE,
1751 .release = x25_release,
1752 .bind = x25_bind,
1753 .connect = x25_connect,
1754 .socketpair = sock_no_socketpair,
1755 .accept = x25_accept,
1756 .getname = x25_getname,
1757 .poll = datagram_poll,
1758 .ioctl = x25_ioctl,
1759 #ifdef CONFIG_COMPAT
1760 .compat_ioctl = compat_x25_ioctl,
1761 #endif
1762 .listen = x25_listen,
1763 .shutdown = sock_no_shutdown,
1764 .setsockopt = x25_setsockopt,
1765 .getsockopt = x25_getsockopt,
1766 .sendmsg = x25_sendmsg,
1767 .recvmsg = x25_recvmsg,
1768 .mmap = sock_no_mmap,
1769 .sendpage = sock_no_sendpage,
1770 };
1771
1772 static struct packet_type x25_packet_type __read_mostly = {
1773 .type = cpu_to_be16(ETH_P_X25),
1774 .func = x25_lapb_receive_frame,
1775 };
1776
1777 static struct notifier_block x25_dev_notifier = {
1778 .notifier_call = x25_device_event,
1779 };
1780
1781 void x25_kill_by_neigh(struct x25_neigh *nb)
1782 {
1783 struct sock *s;
1784
1785 write_lock_bh(&x25_list_lock);
1786
1787 sk_for_each(s, &x25_list)
1788 if (x25_sk(s)->neighbour == nb)
1789 x25_disconnect(s, ENETUNREACH, 0, 0);
1790
1791 write_unlock_bh(&x25_list_lock);
1792
1793 /* Remove any related forwards */
1794 x25_clear_forward_by_dev(nb->dev);
1795 }
1796
1797 static int __init x25_init(void)
1798 {
1799 int rc;
1800
1801 rc = proto_register(&x25_proto, 0);
1802 if (rc)
1803 goto out;
1804
1805 rc = sock_register(&x25_family_ops);
1806 if (rc)
1807 goto out_proto;
1808
1809 dev_add_pack(&x25_packet_type);
1810
1811 rc = register_netdevice_notifier(&x25_dev_notifier);
1812 if (rc)
1813 goto out_sock;
1814
1815 rc = x25_register_sysctl();
1816 if (rc)
1817 goto out_dev;
1818
1819 rc = x25_proc_init();
1820 if (rc)
1821 goto out_sysctl;
1822
1823 pr_info("Linux Version 0.2\n");
1824
1825 out:
1826 return rc;
1827 out_sysctl:
1828 x25_unregister_sysctl();
1829 out_dev:
1830 unregister_netdevice_notifier(&x25_dev_notifier);
1831 out_sock:
1832 dev_remove_pack(&x25_packet_type);
1833 sock_unregister(AF_X25);
1834 out_proto:
1835 proto_unregister(&x25_proto);
1836 goto out;
1837 }
1838 module_init(x25_init);
1839
1840 static void __exit x25_exit(void)
1841 {
1842 x25_proc_exit();
1843 x25_link_free();
1844 x25_route_free();
1845
1846 x25_unregister_sysctl();
1847
1848 unregister_netdevice_notifier(&x25_dev_notifier);
1849
1850 dev_remove_pack(&x25_packet_type);
1851
1852 sock_unregister(AF_X25);
1853 proto_unregister(&x25_proto);
1854 }
1855 module_exit(x25_exit);
1856
1857 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1858 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1859 MODULE_LICENSE("GPL");
1860 MODULE_ALIAS_NETPROTO(PF_X25);
Linux with added FPC-III support