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