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 (!pskb_may_pull(skb, 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 (!pskb_may_pull(skb, 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 IS_ENABLED(CONFIG_LLC)
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 (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 */
__x25_find_socket(unsigned int lci,struct x25_neigh * nb)323 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
324 {
325 struct sock *s;
326 struct hlist_node *node;
327
328 sk_for_each(s, node, &x25_list)
329 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
330 sock_hold(s);
331 goto found;
332 }
333 s = NULL;
334 found:
335 return s;
336 }
337
x25_find_socket(unsigned int lci,struct x25_neigh * nb)338 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
339 {
340 struct sock *s;
341
342 read_lock_bh(&x25_list_lock);
343 s = __x25_find_socket(lci, nb);
344 read_unlock_bh(&x25_list_lock);
345 return s;
346 }
347
348 /*
349 * Find a unique LCI for a given device.
350 */
x25_new_lci(struct x25_neigh * nb)351 static unsigned int x25_new_lci(struct x25_neigh *nb)
352 {
353 unsigned int lci = 1;
354 struct sock *sk;
355
356 read_lock_bh(&x25_list_lock);
357
358 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
359 sock_put(sk);
360 if (++lci == 4096) {
361 lci = 0;
362 break;
363 }
364 }
365
366 read_unlock_bh(&x25_list_lock);
367 return lci;
368 }
369
370 /*
371 * Deferred destroy.
372 */
373 static void __x25_destroy_socket(struct sock *);
374
375 /*
376 * handler for deferred kills.
377 */
x25_destroy_timer(unsigned long data)378 static void x25_destroy_timer(unsigned long data)
379 {
380 x25_destroy_socket_from_timer((struct sock *)data);
381 }
382
383 /*
384 * This is called from user mode and the timers. Thus it protects itself
385 * against interrupt users but doesn't worry about being called during
386 * work. Once it is removed from the queue no interrupt or bottom half
387 * will touch it and we are (fairly 8-) ) safe.
388 * Not static as it's used by the timer
389 */
__x25_destroy_socket(struct sock * sk)390 static void __x25_destroy_socket(struct sock *sk)
391 {
392 struct sk_buff *skb;
393
394 x25_stop_heartbeat(sk);
395 x25_stop_timer(sk);
396
397 x25_remove_socket(sk);
398 x25_clear_queues(sk); /* Flush the queues */
399
400 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
401 if (skb->sk != sk) { /* A pending connection */
402 /*
403 * Queue the unaccepted socket for death
404 */
405 skb->sk->sk_state = TCP_LISTEN;
406 sock_set_flag(skb->sk, SOCK_DEAD);
407 x25_start_heartbeat(skb->sk);
408 x25_sk(skb->sk)->state = X25_STATE_0;
409 }
410
411 kfree_skb(skb);
412 }
413
414 if (sk_has_allocations(sk)) {
415 /* Defer: outstanding buffers */
416 sk->sk_timer.expires = jiffies + 10 * HZ;
417 sk->sk_timer.function = x25_destroy_timer;
418 sk->sk_timer.data = (unsigned long)sk;
419 add_timer(&sk->sk_timer);
420 } else {
421 /* drop last reference so sock_put will free */
422 __sock_put(sk);
423 }
424 }
425
x25_destroy_socket_from_timer(struct sock * sk)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
x25_setsockopt(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)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
x25_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)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
x25_listen(struct socket * sock,int backlog)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
x25_alloc_socket(struct net * net)519 static struct sock *x25_alloc_socket(struct net *net)
520 {
521 struct x25_sock *x25;
522 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
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
x25_create(struct net * net,struct socket * sock,int protocol,int kern)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)) == 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
x25_make_new(struct sock * osk)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))) == 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
x25_release(struct socket * sock)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
x25_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)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 len = strlen(addr->sx25_addr.x25_addr);
692 for (i = 0; i < len; i++) {
693 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
694 rc = -EINVAL;
695 goto out;
696 }
697 }
698
699 lock_sock(sk);
700 x25_sk(sk)->source_addr = addr->sx25_addr;
701 x25_insert_socket(sk);
702 sock_reset_flag(sk, SOCK_ZAPPED);
703 release_sock(sk);
704 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
705 out:
706 return rc;
707 }
708
x25_wait_for_connection_establishment(struct sock * sk)709 static int x25_wait_for_connection_establishment(struct sock *sk)
710 {
711 DECLARE_WAITQUEUE(wait, current);
712 int rc;
713
714 add_wait_queue_exclusive(sk_sleep(sk), &wait);
715 for (;;) {
716 __set_current_state(TASK_INTERRUPTIBLE);
717 rc = -ERESTARTSYS;
718 if (signal_pending(current))
719 break;
720 rc = sock_error(sk);
721 if (rc) {
722 sk->sk_socket->state = SS_UNCONNECTED;
723 break;
724 }
725 rc = 0;
726 if (sk->sk_state != TCP_ESTABLISHED) {
727 release_sock(sk);
728 schedule();
729 lock_sock(sk);
730 } else
731 break;
732 }
733 __set_current_state(TASK_RUNNING);
734 remove_wait_queue(sk_sleep(sk), &wait);
735 return rc;
736 }
737
x25_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)738 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
739 int addr_len, int flags)
740 {
741 struct sock *sk = sock->sk;
742 struct x25_sock *x25 = x25_sk(sk);
743 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
744 struct x25_route *rt;
745 int rc = 0;
746
747 lock_sock(sk);
748 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
749 sock->state = SS_CONNECTED;
750 goto out; /* Connect completed during a ERESTARTSYS event */
751 }
752
753 rc = -ECONNREFUSED;
754 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
755 sock->state = SS_UNCONNECTED;
756 goto out;
757 }
758
759 rc = -EISCONN; /* No reconnect on a seqpacket socket */
760 if (sk->sk_state == TCP_ESTABLISHED)
761 goto out;
762
763 sk->sk_state = TCP_CLOSE;
764 sock->state = SS_UNCONNECTED;
765
766 rc = -EINVAL;
767 if (addr_len != sizeof(struct sockaddr_x25) ||
768 addr->sx25_family != AF_X25)
769 goto out;
770
771 rc = -ENETUNREACH;
772 rt = x25_get_route(&addr->sx25_addr);
773 if (!rt)
774 goto out;
775
776 x25->neighbour = x25_get_neigh(rt->dev);
777 if (!x25->neighbour)
778 goto out_put_route;
779
780 x25_limit_facilities(&x25->facilities, x25->neighbour);
781
782 x25->lci = x25_new_lci(x25->neighbour);
783 if (!x25->lci)
784 goto out_put_neigh;
785
786 rc = -EINVAL;
787 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
788 goto out_put_neigh;
789
790 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
791 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
792
793 x25->dest_addr = addr->sx25_addr;
794
795 /* Move to connecting socket, start sending Connect Requests */
796 sock->state = SS_CONNECTING;
797 sk->sk_state = TCP_SYN_SENT;
798
799 x25->state = X25_STATE_1;
800
801 x25_write_internal(sk, X25_CALL_REQUEST);
802
803 x25_start_heartbeat(sk);
804 x25_start_t21timer(sk);
805
806 /* Now the loop */
807 rc = -EINPROGRESS;
808 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
809 goto out_put_neigh;
810
811 rc = x25_wait_for_connection_establishment(sk);
812 if (rc)
813 goto out_put_neigh;
814
815 sock->state = SS_CONNECTED;
816 rc = 0;
817 out_put_neigh:
818 if (rc)
819 x25_neigh_put(x25->neighbour);
820 out_put_route:
821 x25_route_put(rt);
822 out:
823 release_sock(sk);
824 return rc;
825 }
826
x25_wait_for_data(struct sock * sk,long timeout)827 static int x25_wait_for_data(struct sock *sk, long timeout)
828 {
829 DECLARE_WAITQUEUE(wait, current);
830 int rc = 0;
831
832 add_wait_queue_exclusive(sk_sleep(sk), &wait);
833 for (;;) {
834 __set_current_state(TASK_INTERRUPTIBLE);
835 if (sk->sk_shutdown & RCV_SHUTDOWN)
836 break;
837 rc = -ERESTARTSYS;
838 if (signal_pending(current))
839 break;
840 rc = -EAGAIN;
841 if (!timeout)
842 break;
843 rc = 0;
844 if (skb_queue_empty(&sk->sk_receive_queue)) {
845 release_sock(sk);
846 timeout = schedule_timeout(timeout);
847 lock_sock(sk);
848 } else
849 break;
850 }
851 __set_current_state(TASK_RUNNING);
852 remove_wait_queue(sk_sleep(sk), &wait);
853 return rc;
854 }
855
x25_accept(struct socket * sock,struct socket * newsock,int flags)856 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
857 {
858 struct sock *sk = sock->sk;
859 struct sock *newsk;
860 struct sk_buff *skb;
861 int rc = -EINVAL;
862
863 if (!sk)
864 goto out;
865
866 rc = -EOPNOTSUPP;
867 if (sk->sk_type != SOCK_SEQPACKET)
868 goto out;
869
870 lock_sock(sk);
871 rc = -EINVAL;
872 if (sk->sk_state != TCP_LISTEN)
873 goto out2;
874
875 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
876 if (rc)
877 goto out2;
878 skb = skb_dequeue(&sk->sk_receive_queue);
879 rc = -EINVAL;
880 if (!skb->sk)
881 goto out2;
882 newsk = skb->sk;
883 sock_graft(newsk, newsock);
884
885 /* Now attach up the new socket */
886 skb->sk = NULL;
887 kfree_skb(skb);
888 sk->sk_ack_backlog--;
889 newsock->state = SS_CONNECTED;
890 rc = 0;
891 out2:
892 release_sock(sk);
893 out:
894 return rc;
895 }
896
x25_getname(struct socket * sock,struct sockaddr * uaddr,int * uaddr_len,int peer)897 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
898 int *uaddr_len, int peer)
899 {
900 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
901 struct sock *sk = sock->sk;
902 struct x25_sock *x25 = x25_sk(sk);
903 int rc = 0;
904
905 if (peer) {
906 if (sk->sk_state != TCP_ESTABLISHED) {
907 rc = -ENOTCONN;
908 goto out;
909 }
910 sx25->sx25_addr = x25->dest_addr;
911 } else
912 sx25->sx25_addr = x25->source_addr;
913
914 sx25->sx25_family = AF_X25;
915 *uaddr_len = sizeof(*sx25);
916
917 out:
918 return rc;
919 }
920
x25_rx_call_request(struct sk_buff * skb,struct x25_neigh * nb,unsigned int lci)921 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
922 unsigned int lci)
923 {
924 struct sock *sk;
925 struct sock *make;
926 struct x25_sock *makex25;
927 struct x25_address source_addr, dest_addr;
928 struct x25_facilities facilities;
929 struct x25_dte_facilities dte_facilities;
930 int len, addr_len, rc;
931
932 /*
933 * Remove the LCI and frame type.
934 */
935 skb_pull(skb, X25_STD_MIN_LEN);
936
937 /*
938 * Extract the X.25 addresses and convert them to ASCII strings,
939 * and remove them.
940 *
941 * Address block is mandatory in call request packets
942 */
943 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
944 if (addr_len <= 0)
945 goto out_clear_request;
946 skb_pull(skb, addr_len);
947
948 /*
949 * Get the length of the facilities, skip past them for the moment
950 * get the call user data because this is needed to determine
951 * the correct listener
952 *
953 * Facilities length is mandatory in call request packets
954 */
955 if (!pskb_may_pull(skb, 1))
956 goto out_clear_request;
957 len = skb->data[0] + 1;
958 if (!pskb_may_pull(skb, len))
959 goto out_clear_request;
960 skb_pull(skb,len);
961
962 /*
963 * Ensure that the amount of call user data is valid.
964 */
965 if (skb->len > X25_MAX_CUD_LEN)
966 goto out_clear_request;
967
968 /*
969 * Get all the call user data so it can be used in
970 * x25_find_listener and skb_copy_from_linear_data up ahead.
971 */
972 if (!pskb_may_pull(skb, skb->len))
973 goto out_clear_request;
974
975 /*
976 * Find a listener for the particular address/cud pair.
977 */
978 sk = x25_find_listener(&source_addr,skb);
979 skb_push(skb,len);
980
981 if (sk != NULL && sk_acceptq_is_full(sk)) {
982 goto out_sock_put;
983 }
984
985 /*
986 * We dont have any listeners for this incoming call.
987 * Try forwarding it.
988 */
989 if (sk == NULL) {
990 skb_push(skb, addr_len + X25_STD_MIN_LEN);
991 if (sysctl_x25_forward &&
992 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
993 {
994 /* Call was forwarded, dont process it any more */
995 kfree_skb(skb);
996 rc = 1;
997 goto out;
998 } else {
999 /* No listeners, can't forward, clear the call */
1000 goto out_clear_request;
1001 }
1002 }
1003
1004 /*
1005 * Try to reach a compromise on the requested facilities.
1006 */
1007 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1008 if (len == -1)
1009 goto out_sock_put;
1010
1011 /*
1012 * current neighbour/link might impose additional limits
1013 * on certain facilties
1014 */
1015
1016 x25_limit_facilities(&facilities, nb);
1017
1018 /*
1019 * Try to create a new socket.
1020 */
1021 make = x25_make_new(sk);
1022 if (!make)
1023 goto out_sock_put;
1024
1025 /*
1026 * Remove the facilities
1027 */
1028 skb_pull(skb, len);
1029
1030 skb->sk = make;
1031 make->sk_state = TCP_ESTABLISHED;
1032
1033 makex25 = x25_sk(make);
1034 makex25->lci = lci;
1035 makex25->dest_addr = dest_addr;
1036 makex25->source_addr = source_addr;
1037 makex25->neighbour = nb;
1038 makex25->facilities = facilities;
1039 makex25->dte_facilities= dte_facilities;
1040 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1041 /* ensure no reverse facil on accept */
1042 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1043 /* ensure no calling address extension on accept */
1044 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1045 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1046
1047 /* Normally all calls are accepted immediately */
1048 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1049 x25_write_internal(make, X25_CALL_ACCEPTED);
1050 makex25->state = X25_STATE_3;
1051 }
1052
1053 /*
1054 * Incoming Call User Data.
1055 */
1056 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1057 makex25->calluserdata.cudlength = skb->len;
1058
1059 sk->sk_ack_backlog++;
1060
1061 x25_insert_socket(make);
1062
1063 skb_queue_head(&sk->sk_receive_queue, skb);
1064
1065 x25_start_heartbeat(make);
1066
1067 if (!sock_flag(sk, SOCK_DEAD))
1068 sk->sk_data_ready(sk, skb->len);
1069 rc = 1;
1070 sock_put(sk);
1071 out:
1072 return rc;
1073 out_sock_put:
1074 sock_put(sk);
1075 out_clear_request:
1076 rc = 0;
1077 x25_transmit_clear_request(nb, lci, 0x01);
1078 goto out;
1079 }
1080
x25_sendmsg(struct kiocb * iocb,struct socket * sock,struct msghdr * msg,size_t len)1081 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1082 struct msghdr *msg, size_t len)
1083 {
1084 struct sock *sk = sock->sk;
1085 struct x25_sock *x25 = x25_sk(sk);
1086 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1087 struct sockaddr_x25 sx25;
1088 struct sk_buff *skb;
1089 unsigned char *asmptr;
1090 int noblock = msg->msg_flags & MSG_DONTWAIT;
1091 size_t size;
1092 int qbit = 0, rc = -EINVAL;
1093
1094 lock_sock(sk);
1095 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1096 goto out;
1097
1098 /* we currently don't support segmented records at the user interface */
1099 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1100 goto out;
1101
1102 rc = -EADDRNOTAVAIL;
1103 if (sock_flag(sk, SOCK_ZAPPED))
1104 goto out;
1105
1106 rc = -EPIPE;
1107 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1108 send_sig(SIGPIPE, current, 0);
1109 goto out;
1110 }
1111
1112 rc = -ENETUNREACH;
1113 if (!x25->neighbour)
1114 goto out;
1115
1116 if (usx25) {
1117 rc = -EINVAL;
1118 if (msg->msg_namelen < sizeof(sx25))
1119 goto out;
1120 memcpy(&sx25, usx25, sizeof(sx25));
1121 rc = -EISCONN;
1122 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1123 goto out;
1124 rc = -EINVAL;
1125 if (sx25.sx25_family != AF_X25)
1126 goto out;
1127 } else {
1128 /*
1129 * FIXME 1003.1g - if the socket is like this because
1130 * it has become closed (not started closed) we ought
1131 * to SIGPIPE, EPIPE;
1132 */
1133 rc = -ENOTCONN;
1134 if (sk->sk_state != TCP_ESTABLISHED)
1135 goto out;
1136
1137 sx25.sx25_family = AF_X25;
1138 sx25.sx25_addr = x25->dest_addr;
1139 }
1140
1141 /* Sanity check the packet size */
1142 if (len > 65535) {
1143 rc = -EMSGSIZE;
1144 goto out;
1145 }
1146
1147 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1148
1149 /* Build a packet */
1150 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1151
1152 if ((msg->msg_flags & MSG_OOB) && len > 32)
1153 len = 32;
1154
1155 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1156
1157 release_sock(sk);
1158 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1159 lock_sock(sk);
1160 if (!skb)
1161 goto out;
1162 X25_SKB_CB(skb)->flags = msg->msg_flags;
1163
1164 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1165
1166 /*
1167 * Put the data on the end
1168 */
1169 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1170
1171 skb_reset_transport_header(skb);
1172 skb_put(skb, len);
1173
1174 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1175 if (rc)
1176 goto out_kfree_skb;
1177
1178 /*
1179 * If the Q BIT Include socket option is in force, the first
1180 * byte of the user data is the logical value of the Q Bit.
1181 */
1182 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1183 if (!pskb_may_pull(skb, 1))
1184 goto out_kfree_skb;
1185
1186 qbit = skb->data[0];
1187 skb_pull(skb, 1);
1188 }
1189
1190 /*
1191 * Push down the X.25 header
1192 */
1193 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1194
1195 if (msg->msg_flags & MSG_OOB) {
1196 if (x25->neighbour->extended) {
1197 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1198 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1199 *asmptr++ = (x25->lci >> 0) & 0xFF;
1200 *asmptr++ = X25_INTERRUPT;
1201 } else {
1202 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1203 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1204 *asmptr++ = (x25->lci >> 0) & 0xFF;
1205 *asmptr++ = X25_INTERRUPT;
1206 }
1207 } else {
1208 if (x25->neighbour->extended) {
1209 /* Build an Extended X.25 header */
1210 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1211 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1212 *asmptr++ = (x25->lci >> 0) & 0xFF;
1213 *asmptr++ = X25_DATA;
1214 *asmptr++ = X25_DATA;
1215 } else {
1216 /* Build an Standard X.25 header */
1217 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1218 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1219 *asmptr++ = (x25->lci >> 0) & 0xFF;
1220 *asmptr++ = X25_DATA;
1221 }
1222
1223 if (qbit)
1224 skb->data[0] |= X25_Q_BIT;
1225 }
1226
1227 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1228 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1229
1230 rc = -ENOTCONN;
1231 if (sk->sk_state != TCP_ESTABLISHED)
1232 goto out_kfree_skb;
1233
1234 if (msg->msg_flags & MSG_OOB)
1235 skb_queue_tail(&x25->interrupt_out_queue, skb);
1236 else {
1237 rc = x25_output(sk, skb);
1238 len = rc;
1239 if (rc < 0)
1240 kfree_skb(skb);
1241 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1242 len++;
1243 }
1244
1245 x25_kick(sk);
1246 rc = len;
1247 out:
1248 release_sock(sk);
1249 return rc;
1250 out_kfree_skb:
1251 kfree_skb(skb);
1252 goto out;
1253 }
1254
1255
x25_recvmsg(struct kiocb * iocb,struct socket * sock,struct msghdr * msg,size_t size,int flags)1256 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1257 struct msghdr *msg, size_t size,
1258 int flags)
1259 {
1260 struct sock *sk = sock->sk;
1261 struct x25_sock *x25 = x25_sk(sk);
1262 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1263 size_t copied;
1264 int qbit, header_len;
1265 struct sk_buff *skb;
1266 unsigned char *asmptr;
1267 int rc = -ENOTCONN;
1268
1269 lock_sock(sk);
1270
1271 if (x25->neighbour == NULL)
1272 goto out;
1273
1274 header_len = x25->neighbour->extended ?
1275 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1276
1277 /*
1278 * This works for seqpacket too. The receiver has ordered the queue for
1279 * us! We do one quick check first though
1280 */
1281 if (sk->sk_state != TCP_ESTABLISHED)
1282 goto out;
1283
1284 if (flags & MSG_OOB) {
1285 rc = -EINVAL;
1286 if (sock_flag(sk, SOCK_URGINLINE) ||
1287 !skb_peek(&x25->interrupt_in_queue))
1288 goto out;
1289
1290 skb = skb_dequeue(&x25->interrupt_in_queue);
1291
1292 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1293 goto out_free_dgram;
1294
1295 skb_pull(skb, X25_STD_MIN_LEN);
1296
1297 /*
1298 * No Q bit information on Interrupt data.
1299 */
1300 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1301 asmptr = skb_push(skb, 1);
1302 *asmptr = 0x00;
1303 }
1304
1305 msg->msg_flags |= MSG_OOB;
1306 } else {
1307 /* Now we can treat all alike */
1308 release_sock(sk);
1309 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1310 flags & MSG_DONTWAIT, &rc);
1311 lock_sock(sk);
1312 if (!skb)
1313 goto out;
1314
1315 if (!pskb_may_pull(skb, header_len))
1316 goto out_free_dgram;
1317
1318 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1319
1320 skb_pull(skb, header_len);
1321
1322 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1323 asmptr = skb_push(skb, 1);
1324 *asmptr = qbit;
1325 }
1326 }
1327
1328 skb_reset_transport_header(skb);
1329 copied = skb->len;
1330
1331 if (copied > size) {
1332 copied = size;
1333 msg->msg_flags |= MSG_TRUNC;
1334 }
1335
1336 /* Currently, each datagram always contains a complete record */
1337 msg->msg_flags |= MSG_EOR;
1338
1339 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1340 if (rc)
1341 goto out_free_dgram;
1342
1343 if (sx25) {
1344 sx25->sx25_family = AF_X25;
1345 sx25->sx25_addr = x25->dest_addr;
1346 msg->msg_namelen = sizeof(*sx25);
1347 }
1348
1349 x25_check_rbuf(sk);
1350 rc = copied;
1351 out_free_dgram:
1352 skb_free_datagram(sk, skb);
1353 out:
1354 release_sock(sk);
1355 return rc;
1356 }
1357
1358
x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1359 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1360 {
1361 struct sock *sk = sock->sk;
1362 struct x25_sock *x25 = x25_sk(sk);
1363 void __user *argp = (void __user *)arg;
1364 int rc;
1365
1366 switch (cmd) {
1367 case TIOCOUTQ: {
1368 int amount;
1369
1370 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1371 if (amount < 0)
1372 amount = 0;
1373 rc = put_user(amount, (unsigned int __user *)argp);
1374 break;
1375 }
1376
1377 case TIOCINQ: {
1378 struct sk_buff *skb;
1379 int amount = 0;
1380 /*
1381 * These two are safe on a single CPU system as
1382 * only user tasks fiddle here
1383 */
1384 lock_sock(sk);
1385 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1386 amount = skb->len;
1387 release_sock(sk);
1388 rc = put_user(amount, (unsigned int __user *)argp);
1389 break;
1390 }
1391
1392 case SIOCGSTAMP:
1393 rc = -EINVAL;
1394 if (sk)
1395 rc = sock_get_timestamp(sk,
1396 (struct timeval __user *)argp);
1397 break;
1398 case SIOCGSTAMPNS:
1399 rc = -EINVAL;
1400 if (sk)
1401 rc = sock_get_timestampns(sk,
1402 (struct timespec __user *)argp);
1403 break;
1404 case SIOCGIFADDR:
1405 case SIOCSIFADDR:
1406 case SIOCGIFDSTADDR:
1407 case SIOCSIFDSTADDR:
1408 case SIOCGIFBRDADDR:
1409 case SIOCSIFBRDADDR:
1410 case SIOCGIFNETMASK:
1411 case SIOCSIFNETMASK:
1412 case SIOCGIFMETRIC:
1413 case SIOCSIFMETRIC:
1414 rc = -EINVAL;
1415 break;
1416 case SIOCADDRT:
1417 case SIOCDELRT:
1418 rc = -EPERM;
1419 if (!capable(CAP_NET_ADMIN))
1420 break;
1421 rc = x25_route_ioctl(cmd, argp);
1422 break;
1423 case SIOCX25GSUBSCRIP:
1424 rc = x25_subscr_ioctl(cmd, argp);
1425 break;
1426 case SIOCX25SSUBSCRIP:
1427 rc = -EPERM;
1428 if (!capable(CAP_NET_ADMIN))
1429 break;
1430 rc = x25_subscr_ioctl(cmd, argp);
1431 break;
1432 case SIOCX25GFACILITIES: {
1433 lock_sock(sk);
1434 rc = copy_to_user(argp, &x25->facilities,
1435 sizeof(x25->facilities))
1436 ? -EFAULT : 0;
1437 release_sock(sk);
1438 break;
1439 }
1440
1441 case SIOCX25SFACILITIES: {
1442 struct x25_facilities facilities;
1443 rc = -EFAULT;
1444 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1445 break;
1446 rc = -EINVAL;
1447 lock_sock(sk);
1448 if (sk->sk_state != TCP_LISTEN &&
1449 sk->sk_state != TCP_CLOSE)
1450 goto out_fac_release;
1451 if (facilities.pacsize_in < X25_PS16 ||
1452 facilities.pacsize_in > X25_PS4096)
1453 goto out_fac_release;
1454 if (facilities.pacsize_out < X25_PS16 ||
1455 facilities.pacsize_out > X25_PS4096)
1456 goto out_fac_release;
1457 if (facilities.winsize_in < 1 ||
1458 facilities.winsize_in > 127)
1459 goto out_fac_release;
1460 if (facilities.throughput) {
1461 int out = facilities.throughput & 0xf0;
1462 int in = facilities.throughput & 0x0f;
1463 if (!out)
1464 facilities.throughput |=
1465 X25_DEFAULT_THROUGHPUT << 4;
1466 else if (out < 0x30 || out > 0xD0)
1467 goto out_fac_release;
1468 if (!in)
1469 facilities.throughput |=
1470 X25_DEFAULT_THROUGHPUT;
1471 else if (in < 0x03 || in > 0x0D)
1472 goto out_fac_release;
1473 }
1474 if (facilities.reverse &&
1475 (facilities.reverse & 0x81) != 0x81)
1476 goto out_fac_release;
1477 x25->facilities = facilities;
1478 rc = 0;
1479 out_fac_release:
1480 release_sock(sk);
1481 break;
1482 }
1483
1484 case SIOCX25GDTEFACILITIES: {
1485 lock_sock(sk);
1486 rc = copy_to_user(argp, &x25->dte_facilities,
1487 sizeof(x25->dte_facilities));
1488 release_sock(sk);
1489 if (rc)
1490 rc = -EFAULT;
1491 break;
1492 }
1493
1494 case SIOCX25SDTEFACILITIES: {
1495 struct x25_dte_facilities dtefacs;
1496 rc = -EFAULT;
1497 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1498 break;
1499 rc = -EINVAL;
1500 lock_sock(sk);
1501 if (sk->sk_state != TCP_LISTEN &&
1502 sk->sk_state != TCP_CLOSE)
1503 goto out_dtefac_release;
1504 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1505 goto out_dtefac_release;
1506 if (dtefacs.calling_ae == NULL)
1507 goto out_dtefac_release;
1508 if (dtefacs.called_len > X25_MAX_AE_LEN)
1509 goto out_dtefac_release;
1510 if (dtefacs.called_ae == NULL)
1511 goto out_dtefac_release;
1512 x25->dte_facilities = dtefacs;
1513 rc = 0;
1514 out_dtefac_release:
1515 release_sock(sk);
1516 break;
1517 }
1518
1519 case SIOCX25GCALLUSERDATA: {
1520 lock_sock(sk);
1521 rc = copy_to_user(argp, &x25->calluserdata,
1522 sizeof(x25->calluserdata))
1523 ? -EFAULT : 0;
1524 release_sock(sk);
1525 break;
1526 }
1527
1528 case SIOCX25SCALLUSERDATA: {
1529 struct x25_calluserdata calluserdata;
1530
1531 rc = -EFAULT;
1532 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1533 break;
1534 rc = -EINVAL;
1535 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1536 break;
1537 lock_sock(sk);
1538 x25->calluserdata = calluserdata;
1539 release_sock(sk);
1540 rc = 0;
1541 break;
1542 }
1543
1544 case SIOCX25GCAUSEDIAG: {
1545 lock_sock(sk);
1546 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1547 ? -EFAULT : 0;
1548 release_sock(sk);
1549 break;
1550 }
1551
1552 case SIOCX25SCAUSEDIAG: {
1553 struct x25_causediag causediag;
1554 rc = -EFAULT;
1555 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1556 break;
1557 lock_sock(sk);
1558 x25->causediag = causediag;
1559 release_sock(sk);
1560 rc = 0;
1561 break;
1562
1563 }
1564
1565 case SIOCX25SCUDMATCHLEN: {
1566 struct x25_subaddr sub_addr;
1567 rc = -EINVAL;
1568 lock_sock(sk);
1569 if(sk->sk_state != TCP_CLOSE)
1570 goto out_cud_release;
1571 rc = -EFAULT;
1572 if (copy_from_user(&sub_addr, argp,
1573 sizeof(sub_addr)))
1574 goto out_cud_release;
1575 rc = -EINVAL;
1576 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1577 goto out_cud_release;
1578 x25->cudmatchlength = sub_addr.cudmatchlength;
1579 rc = 0;
1580 out_cud_release:
1581 release_sock(sk);
1582 break;
1583 }
1584
1585 case SIOCX25CALLACCPTAPPRV: {
1586 rc = -EINVAL;
1587 lock_sock(sk);
1588 if (sk->sk_state == TCP_CLOSE) {
1589 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1590 rc = 0;
1591 }
1592 release_sock(sk);
1593 break;
1594 }
1595
1596 case SIOCX25SENDCALLACCPT: {
1597 rc = -EINVAL;
1598 lock_sock(sk);
1599 if (sk->sk_state != TCP_ESTABLISHED)
1600 goto out_sendcallaccpt_release;
1601 /* must call accptapprv above */
1602 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1603 goto out_sendcallaccpt_release;
1604 x25_write_internal(sk, X25_CALL_ACCEPTED);
1605 x25->state = X25_STATE_3;
1606 rc = 0;
1607 out_sendcallaccpt_release:
1608 release_sock(sk);
1609 break;
1610 }
1611
1612 default:
1613 rc = -ENOIOCTLCMD;
1614 break;
1615 }
1616
1617 return rc;
1618 }
1619
1620 static const struct net_proto_family x25_family_ops = {
1621 .family = AF_X25,
1622 .create = x25_create,
1623 .owner = THIS_MODULE,
1624 };
1625
1626 #ifdef CONFIG_COMPAT
compat_x25_subscr_ioctl(unsigned int cmd,struct compat_x25_subscrip_struct __user * x25_subscr32)1627 static int compat_x25_subscr_ioctl(unsigned int cmd,
1628 struct compat_x25_subscrip_struct __user *x25_subscr32)
1629 {
1630 struct compat_x25_subscrip_struct x25_subscr;
1631 struct x25_neigh *nb;
1632 struct net_device *dev;
1633 int rc = -EINVAL;
1634
1635 rc = -EFAULT;
1636 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1637 goto out;
1638
1639 rc = -EINVAL;
1640 dev = x25_dev_get(x25_subscr.device);
1641 if (dev == NULL)
1642 goto out;
1643
1644 nb = x25_get_neigh(dev);
1645 if (nb == NULL)
1646 goto out_dev_put;
1647
1648 dev_put(dev);
1649
1650 if (cmd == SIOCX25GSUBSCRIP) {
1651 read_lock_bh(&x25_neigh_list_lock);
1652 x25_subscr.extended = nb->extended;
1653 x25_subscr.global_facil_mask = nb->global_facil_mask;
1654 read_unlock_bh(&x25_neigh_list_lock);
1655 rc = copy_to_user(x25_subscr32, &x25_subscr,
1656 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1657 } else {
1658 rc = -EINVAL;
1659 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1660 rc = 0;
1661 write_lock_bh(&x25_neigh_list_lock);
1662 nb->extended = x25_subscr.extended;
1663 nb->global_facil_mask = x25_subscr.global_facil_mask;
1664 write_unlock_bh(&x25_neigh_list_lock);
1665 }
1666 }
1667 x25_neigh_put(nb);
1668 out:
1669 return rc;
1670 out_dev_put:
1671 dev_put(dev);
1672 goto out;
1673 }
1674
compat_x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1675 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1676 unsigned long arg)
1677 {
1678 void __user *argp = compat_ptr(arg);
1679 struct sock *sk = sock->sk;
1680
1681 int rc = -ENOIOCTLCMD;
1682
1683 switch(cmd) {
1684 case TIOCOUTQ:
1685 case TIOCINQ:
1686 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1687 break;
1688 case SIOCGSTAMP:
1689 rc = -EINVAL;
1690 if (sk)
1691 rc = compat_sock_get_timestamp(sk,
1692 (struct timeval __user*)argp);
1693 break;
1694 case SIOCGSTAMPNS:
1695 rc = -EINVAL;
1696 if (sk)
1697 rc = compat_sock_get_timestampns(sk,
1698 (struct timespec __user*)argp);
1699 break;
1700 case SIOCGIFADDR:
1701 case SIOCSIFADDR:
1702 case SIOCGIFDSTADDR:
1703 case SIOCSIFDSTADDR:
1704 case SIOCGIFBRDADDR:
1705 case SIOCSIFBRDADDR:
1706 case SIOCGIFNETMASK:
1707 case SIOCSIFNETMASK:
1708 case SIOCGIFMETRIC:
1709 case SIOCSIFMETRIC:
1710 rc = -EINVAL;
1711 break;
1712 case SIOCADDRT:
1713 case SIOCDELRT:
1714 rc = -EPERM;
1715 if (!capable(CAP_NET_ADMIN))
1716 break;
1717 rc = x25_route_ioctl(cmd, argp);
1718 break;
1719 case SIOCX25GSUBSCRIP:
1720 rc = compat_x25_subscr_ioctl(cmd, argp);
1721 break;
1722 case SIOCX25SSUBSCRIP:
1723 rc = -EPERM;
1724 if (!capable(CAP_NET_ADMIN))
1725 break;
1726 rc = compat_x25_subscr_ioctl(cmd, argp);
1727 break;
1728 case SIOCX25GFACILITIES:
1729 case SIOCX25SFACILITIES:
1730 case SIOCX25GDTEFACILITIES:
1731 case SIOCX25SDTEFACILITIES:
1732 case SIOCX25GCALLUSERDATA:
1733 case SIOCX25SCALLUSERDATA:
1734 case SIOCX25GCAUSEDIAG:
1735 case SIOCX25SCAUSEDIAG:
1736 case SIOCX25SCUDMATCHLEN:
1737 case SIOCX25CALLACCPTAPPRV:
1738 case SIOCX25SENDCALLACCPT:
1739 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1740 break;
1741 default:
1742 rc = -ENOIOCTLCMD;
1743 break;
1744 }
1745 return rc;
1746 }
1747 #endif
1748
1749 static const struct proto_ops x25_proto_ops = {
1750 .family = AF_X25,
1751 .owner = THIS_MODULE,
1752 .release = x25_release,
1753 .bind = x25_bind,
1754 .connect = x25_connect,
1755 .socketpair = sock_no_socketpair,
1756 .accept = x25_accept,
1757 .getname = x25_getname,
1758 .poll = datagram_poll,
1759 .ioctl = x25_ioctl,
1760 #ifdef CONFIG_COMPAT
1761 .compat_ioctl = compat_x25_ioctl,
1762 #endif
1763 .listen = x25_listen,
1764 .shutdown = sock_no_shutdown,
1765 .setsockopt = x25_setsockopt,
1766 .getsockopt = x25_getsockopt,
1767 .sendmsg = x25_sendmsg,
1768 .recvmsg = x25_recvmsg,
1769 .mmap = sock_no_mmap,
1770 .sendpage = sock_no_sendpage,
1771 };
1772
1773 static struct packet_type x25_packet_type __read_mostly = {
1774 .type = cpu_to_be16(ETH_P_X25),
1775 .func = x25_lapb_receive_frame,
1776 };
1777
1778 static struct notifier_block x25_dev_notifier = {
1779 .notifier_call = x25_device_event,
1780 };
1781
x25_kill_by_neigh(struct x25_neigh * nb)1782 void x25_kill_by_neigh(struct x25_neigh *nb)
1783 {
1784 struct sock *s;
1785 struct hlist_node *node;
1786
1787 write_lock_bh(&x25_list_lock);
1788
1789 sk_for_each(s, node, &x25_list)
1790 if (x25_sk(s)->neighbour == nb)
1791 x25_disconnect(s, ENETUNREACH, 0, 0);
1792
1793 write_unlock_bh(&x25_list_lock);
1794
1795 /* Remove any related forwards */
1796 x25_clear_forward_by_dev(nb->dev);
1797 }
1798
x25_init(void)1799 static int __init x25_init(void)
1800 {
1801 int rc = proto_register(&x25_proto, 0);
1802
1803 if (rc != 0)
1804 goto out;
1805
1806 rc = sock_register(&x25_family_ops);
1807 if (rc != 0)
1808 goto out_proto;
1809
1810 dev_add_pack(&x25_packet_type);
1811
1812 rc = register_netdevice_notifier(&x25_dev_notifier);
1813 if (rc != 0)
1814 goto out_sock;
1815
1816 printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1817
1818 x25_register_sysctl();
1819 rc = x25_proc_init();
1820 if (rc != 0)
1821 goto out_dev;
1822 out:
1823 return rc;
1824 out_dev:
1825 unregister_netdevice_notifier(&x25_dev_notifier);
1826 out_sock:
1827 sock_unregister(AF_X25);
1828 out_proto:
1829 proto_unregister(&x25_proto);
1830 goto out;
1831 }
1832 module_init(x25_init);
1833
x25_exit(void)1834 static void __exit x25_exit(void)
1835 {
1836 x25_proc_exit();
1837 x25_link_free();
1838 x25_route_free();
1839
1840 x25_unregister_sysctl();
1841
1842 unregister_netdevice_notifier(&x25_dev_notifier);
1843
1844 dev_remove_pack(&x25_packet_type);
1845
1846 sock_unregister(AF_X25);
1847 proto_unregister(&x25_proto);
1848 }
1849 module_exit(x25_exit);
1850
1851 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1852 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1853 MODULE_LICENSE("GPL");
1854 MODULE_ALIAS_NETPROTO(PF_X25);
1855