1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * X.25 Packet Layer release 002
4 *
5 * This is ALPHA test software. This code may break your machine,
6 * randomly fail to work with new releases, misbehave and/or generally
7 * screw up. It might even work.
8 *
9 * This code REQUIRES 2.1.15 or higher
10 *
11 * History
12 * X.25 001 Jonathan Naylor Started coding.
13 * X.25 002 Jonathan Naylor Centralised disconnect handling.
14 * New timer architecture.
15 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant.
16 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of
17 * facilities negotiation and increased
18 * the throughput upper limit.
19 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups
20 * 2000-09-04 Henner Eisen Set sock->state in x25_accept().
21 * Fixed x25_output() related skb leakage.
22 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket.
23 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation.
24 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN
25 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
26 * x25_proc.c, using seq_file
27 * 2005-04-02 Shaun Pereira Selective sub address matching
28 * with call user data
29 * 2005-04-15 Shaun Pereira Fast select with no restriction on
30 * response
31 */
32
33 #define pr_fmt(fmt) "X25: " fmt
34
35 #include <linux/module.h>
36 #include <linux/capability.h>
37 #include <linux/errno.h>
38 #include <linux/kernel.h>
39 #include <linux/sched/signal.h>
40 #include <linux/timer.h>
41 #include <linux/string.h>
42 #include <linux/net.h>
43 #include <linux/netdevice.h>
44 #include <linux/if_arp.h>
45 #include <linux/skbuff.h>
46 #include <linux/slab.h>
47 #include <net/sock.h>
48 #include <net/tcp_states.h>
49 #include <linux/uaccess.h>
50 #include <linux/fcntl.h>
51 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
52 #include <linux/notifier.h>
53 #include <linux/init.h>
54 #include <linux/compat.h>
55 #include <linux/ctype.h>
56
57 #include <net/x25.h>
58 #include <net/compat.h>
59
60 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
61 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
62 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
63 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
64 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
65 int sysctl_x25_forward = 0;
66
67 HLIST_HEAD(x25_list);
68 DEFINE_RWLOCK(x25_list_lock);
69
70 static const struct proto_ops x25_proto_ops;
71
72 static const struct x25_address null_x25_address = {" "};
73
74 #ifdef CONFIG_COMPAT
75 struct compat_x25_subscrip_struct {
76 char device[200-sizeof(compat_ulong_t)];
77 compat_ulong_t global_facil_mask;
78 compat_uint_t extended;
79 };
80 #endif
81
82
x25_parse_address_block(struct sk_buff * skb,struct x25_address * called_addr,struct x25_address * calling_addr)83 int x25_parse_address_block(struct sk_buff *skb,
84 struct x25_address *called_addr,
85 struct x25_address *calling_addr)
86 {
87 unsigned char len;
88 int needed;
89 int rc;
90
91 if (!pskb_may_pull(skb, 1)) {
92 /* packet has no address block */
93 rc = 0;
94 goto empty;
95 }
96
97 len = *skb->data;
98 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
99
100 if (!pskb_may_pull(skb, needed)) {
101 /* packet is too short to hold the addresses it claims
102 to hold */
103 rc = -1;
104 goto empty;
105 }
106
107 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
108
109 empty:
110 *called_addr->x25_addr = 0;
111 *calling_addr->x25_addr = 0;
112
113 return rc;
114 }
115
116
x25_addr_ntoa(unsigned char * p,struct x25_address * called_addr,struct x25_address * calling_addr)117 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
118 struct x25_address *calling_addr)
119 {
120 unsigned int called_len, calling_len;
121 char *called, *calling;
122 unsigned int i;
123
124 called_len = (*p >> 0) & 0x0F;
125 calling_len = (*p >> 4) & 0x0F;
126
127 called = called_addr->x25_addr;
128 calling = calling_addr->x25_addr;
129 p++;
130
131 for (i = 0; i < (called_len + calling_len); i++) {
132 if (i < called_len) {
133 if (i % 2 != 0) {
134 *called++ = ((*p >> 0) & 0x0F) + '0';
135 p++;
136 } else {
137 *called++ = ((*p >> 4) & 0x0F) + '0';
138 }
139 } else {
140 if (i % 2 != 0) {
141 *calling++ = ((*p >> 0) & 0x0F) + '0';
142 p++;
143 } else {
144 *calling++ = ((*p >> 4) & 0x0F) + '0';
145 }
146 }
147 }
148
149 *called = *calling = '\0';
150
151 return 1 + (called_len + calling_len + 1) / 2;
152 }
153
x25_addr_aton(unsigned char * p,struct x25_address * called_addr,struct x25_address * calling_addr)154 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
155 struct x25_address *calling_addr)
156 {
157 unsigned int called_len, calling_len;
158 char *called, *calling;
159 int i;
160
161 called = called_addr->x25_addr;
162 calling = calling_addr->x25_addr;
163
164 called_len = strlen(called);
165 calling_len = strlen(calling);
166
167 *p++ = (calling_len << 4) | (called_len << 0);
168
169 for (i = 0; i < (called_len + calling_len); i++) {
170 if (i < called_len) {
171 if (i % 2 != 0) {
172 *p |= (*called++ - '0') << 0;
173 p++;
174 } else {
175 *p = 0x00;
176 *p |= (*called++ - '0') << 4;
177 }
178 } else {
179 if (i % 2 != 0) {
180 *p |= (*calling++ - '0') << 0;
181 p++;
182 } else {
183 *p = 0x00;
184 *p |= (*calling++ - '0') << 4;
185 }
186 }
187 }
188
189 return 1 + (called_len + calling_len + 1) / 2;
190 }
191
192 /*
193 * Socket removal during an interrupt is now safe.
194 */
x25_remove_socket(struct sock * sk)195 static void x25_remove_socket(struct sock *sk)
196 {
197 write_lock_bh(&x25_list_lock);
198 sk_del_node_init(sk);
199 write_unlock_bh(&x25_list_lock);
200 }
201
202 /*
203 * Kill all bound sockets on a dropped device.
204 */
x25_kill_by_device(struct net_device * dev)205 static void x25_kill_by_device(struct net_device *dev)
206 {
207 struct sock *s;
208
209 write_lock_bh(&x25_list_lock);
210
211 sk_for_each(s, &x25_list)
212 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
213 x25_disconnect(s, ENETUNREACH, 0, 0);
214
215 write_unlock_bh(&x25_list_lock);
216 }
217
218 /*
219 * Handle device status changes.
220 */
x25_device_event(struct notifier_block * this,unsigned long event,void * ptr)221 static int x25_device_event(struct notifier_block *this, unsigned long event,
222 void *ptr)
223 {
224 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
225 struct x25_neigh *nb;
226
227 if (!net_eq(dev_net(dev), &init_net))
228 return NOTIFY_DONE;
229
230 if (dev->type == ARPHRD_X25
231 #if IS_ENABLED(CONFIG_LLC)
232 || dev->type == ARPHRD_ETHER
233 #endif
234 ) {
235 switch (event) {
236 case NETDEV_UP:
237 x25_link_device_up(dev);
238 break;
239 case NETDEV_GOING_DOWN:
240 nb = x25_get_neigh(dev);
241 if (nb) {
242 x25_terminate_link(nb);
243 x25_neigh_put(nb);
244 }
245 break;
246 case NETDEV_DOWN:
247 x25_kill_by_device(dev);
248 x25_route_device_down(dev);
249 x25_link_device_down(dev);
250 break;
251 }
252 }
253
254 return NOTIFY_DONE;
255 }
256
257 /*
258 * Add a socket to the bound sockets list.
259 */
x25_insert_socket(struct sock * sk)260 static void x25_insert_socket(struct sock *sk)
261 {
262 write_lock_bh(&x25_list_lock);
263 sk_add_node(sk, &x25_list);
264 write_unlock_bh(&x25_list_lock);
265 }
266
267 /*
268 * Find a socket that wants to accept the Call Request we just
269 * received. Check the full list for an address/cud match.
270 * If no cuds match return the next_best thing, an address match.
271 * Note: if a listening socket has cud set it must only get calls
272 * with matching cud.
273 */
x25_find_listener(struct x25_address * addr,struct sk_buff * skb)274 static struct sock *x25_find_listener(struct x25_address *addr,
275 struct sk_buff *skb)
276 {
277 struct sock *s;
278 struct sock *next_best;
279
280 read_lock_bh(&x25_list_lock);
281 next_best = NULL;
282
283 sk_for_each(s, &x25_list)
284 if ((!strcmp(addr->x25_addr,
285 x25_sk(s)->source_addr.x25_addr) ||
286 !strcmp(x25_sk(s)->source_addr.x25_addr,
287 null_x25_address.x25_addr)) &&
288 s->sk_state == TCP_LISTEN) {
289 /*
290 * Found a listening socket, now check the incoming
291 * call user data vs this sockets call user data
292 */
293 if (x25_sk(s)->cudmatchlength > 0 &&
294 skb->len >= x25_sk(s)->cudmatchlength) {
295 if((memcmp(x25_sk(s)->calluserdata.cuddata,
296 skb->data,
297 x25_sk(s)->cudmatchlength)) == 0) {
298 sock_hold(s);
299 goto found;
300 }
301 } else
302 next_best = s;
303 }
304 if (next_best) {
305 s = next_best;
306 sock_hold(s);
307 goto found;
308 }
309 s = NULL;
310 found:
311 read_unlock_bh(&x25_list_lock);
312 return s;
313 }
314
315 /*
316 * Find a connected X.25 socket given my LCI and neighbour.
317 */
__x25_find_socket(unsigned int lci,struct x25_neigh * nb)318 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
319 {
320 struct sock *s;
321
322 sk_for_each(s, &x25_list)
323 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
324 sock_hold(s);
325 goto found;
326 }
327 s = NULL;
328 found:
329 return s;
330 }
331
x25_find_socket(unsigned int lci,struct x25_neigh * nb)332 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
333 {
334 struct sock *s;
335
336 read_lock_bh(&x25_list_lock);
337 s = __x25_find_socket(lci, nb);
338 read_unlock_bh(&x25_list_lock);
339 return s;
340 }
341
342 /*
343 * Find a unique LCI for a given device.
344 */
x25_new_lci(struct x25_neigh * nb)345 static unsigned int x25_new_lci(struct x25_neigh *nb)
346 {
347 unsigned int lci = 1;
348 struct sock *sk;
349
350 while ((sk = x25_find_socket(lci, nb)) != NULL) {
351 sock_put(sk);
352 if (++lci == 4096) {
353 lci = 0;
354 break;
355 }
356 cond_resched();
357 }
358
359 return lci;
360 }
361
362 /*
363 * Deferred destroy.
364 */
365 static void __x25_destroy_socket(struct sock *);
366
367 /*
368 * handler for deferred kills.
369 */
x25_destroy_timer(struct timer_list * t)370 static void x25_destroy_timer(struct timer_list *t)
371 {
372 struct sock *sk = from_timer(sk, t, sk_timer);
373
374 x25_destroy_socket_from_timer(sk);
375 }
376
377 /*
378 * This is called from user mode and the timers. Thus it protects itself
379 * against interrupt users but doesn't worry about being called during
380 * work. Once it is removed from the queue no interrupt or bottom half
381 * will touch it and we are (fairly 8-) ) safe.
382 * Not static as it's used by the timer
383 */
__x25_destroy_socket(struct sock * sk)384 static void __x25_destroy_socket(struct sock *sk)
385 {
386 struct sk_buff *skb;
387
388 x25_stop_heartbeat(sk);
389 x25_stop_timer(sk);
390
391 x25_remove_socket(sk);
392 x25_clear_queues(sk); /* Flush the queues */
393
394 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
395 if (skb->sk != sk) { /* A pending connection */
396 /*
397 * Queue the unaccepted socket for death
398 */
399 skb->sk->sk_state = TCP_LISTEN;
400 sock_set_flag(skb->sk, SOCK_DEAD);
401 x25_start_heartbeat(skb->sk);
402 x25_sk(skb->sk)->state = X25_STATE_0;
403 }
404
405 kfree_skb(skb);
406 }
407
408 if (sk_has_allocations(sk)) {
409 /* Defer: outstanding buffers */
410 sk->sk_timer.expires = jiffies + 10 * HZ;
411 sk->sk_timer.function = x25_destroy_timer;
412 add_timer(&sk->sk_timer);
413 } else {
414 /* drop last reference so sock_put will free */
415 __sock_put(sk);
416 }
417 }
418
x25_destroy_socket_from_timer(struct sock * sk)419 void x25_destroy_socket_from_timer(struct sock *sk)
420 {
421 sock_hold(sk);
422 bh_lock_sock(sk);
423 __x25_destroy_socket(sk);
424 bh_unlock_sock(sk);
425 sock_put(sk);
426 }
427
428 /*
429 * Handling for system calls applied via the various interfaces to a
430 * X.25 socket object.
431 */
432
x25_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)433 static int x25_setsockopt(struct socket *sock, int level, int optname,
434 sockptr_t optval, unsigned int optlen)
435 {
436 int opt;
437 struct sock *sk = sock->sk;
438 int rc = -ENOPROTOOPT;
439
440 if (level != SOL_X25 || optname != X25_QBITINCL)
441 goto out;
442
443 rc = -EINVAL;
444 if (optlen < sizeof(int))
445 goto out;
446
447 rc = -EFAULT;
448 if (copy_from_sockptr(&opt, optval, sizeof(int)))
449 goto out;
450
451 if (opt)
452 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
453 else
454 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
455 rc = 0;
456 out:
457 return rc;
458 }
459
x25_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)460 static int x25_getsockopt(struct socket *sock, int level, int optname,
461 char __user *optval, int __user *optlen)
462 {
463 struct sock *sk = sock->sk;
464 int val, len, rc = -ENOPROTOOPT;
465
466 if (level != SOL_X25 || optname != X25_QBITINCL)
467 goto out;
468
469 rc = -EFAULT;
470 if (get_user(len, optlen))
471 goto out;
472
473 len = min_t(unsigned int, len, sizeof(int));
474
475 rc = -EINVAL;
476 if (len < 0)
477 goto out;
478
479 rc = -EFAULT;
480 if (put_user(len, optlen))
481 goto out;
482
483 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
484 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
485 out:
486 return rc;
487 }
488
x25_listen(struct socket * sock,int backlog)489 static int x25_listen(struct socket *sock, int backlog)
490 {
491 struct sock *sk = sock->sk;
492 int rc = -EOPNOTSUPP;
493
494 lock_sock(sk);
495 if (sock->state != SS_UNCONNECTED) {
496 rc = -EINVAL;
497 release_sock(sk);
498 return rc;
499 }
500
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,int kern)518 static struct sock *x25_alloc_socket(struct net *net, int kern)
519 {
520 struct x25_sock *x25;
521 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
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 = -ENOMEM;
556 if ((sk = x25_alloc_socket(net, kern)) == 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), 0)) == 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 case X25_STATE_5:
670 x25_write_internal(sk, X25_CLEAR_REQUEST);
671 x25_disconnect(sk, 0, 0, 0);
672 __x25_destroy_socket(sk);
673 goto out;
674 }
675
676 sock_orphan(sk);
677 out:
678 release_sock(sk);
679 sock_put(sk);
680 return 0;
681 }
682
x25_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)683 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
684 {
685 struct sock *sk = sock->sk;
686 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
687 int len, i, rc = 0;
688
689 if (addr_len != sizeof(struct sockaddr_x25) ||
690 addr->sx25_family != AF_X25 ||
691 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
692 rc = -EINVAL;
693 goto out;
694 }
695
696 /* check for the null_x25_address */
697 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
698
699 len = strlen(addr->sx25_addr.x25_addr);
700 for (i = 0; i < len; i++) {
701 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
702 rc = -EINVAL;
703 goto out;
704 }
705 }
706 }
707
708 lock_sock(sk);
709 if (sock_flag(sk, SOCK_ZAPPED)) {
710 x25_sk(sk)->source_addr = addr->sx25_addr;
711 x25_insert_socket(sk);
712 sock_reset_flag(sk, SOCK_ZAPPED);
713 } else {
714 rc = -EINVAL;
715 }
716 release_sock(sk);
717 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
718 out:
719 return rc;
720 }
721
x25_wait_for_connection_establishment(struct sock * sk)722 static int x25_wait_for_connection_establishment(struct sock *sk)
723 {
724 DECLARE_WAITQUEUE(wait, current);
725 int rc;
726
727 add_wait_queue_exclusive(sk_sleep(sk), &wait);
728 for (;;) {
729 __set_current_state(TASK_INTERRUPTIBLE);
730 rc = -ERESTARTSYS;
731 if (signal_pending(current))
732 break;
733 rc = sock_error(sk);
734 if (rc) {
735 sk->sk_socket->state = SS_UNCONNECTED;
736 break;
737 }
738 rc = 0;
739 if (sk->sk_state != TCP_ESTABLISHED) {
740 release_sock(sk);
741 schedule();
742 lock_sock(sk);
743 } else
744 break;
745 }
746 __set_current_state(TASK_RUNNING);
747 remove_wait_queue(sk_sleep(sk), &wait);
748 return rc;
749 }
750
x25_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)751 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
752 int addr_len, int flags)
753 {
754 struct sock *sk = sock->sk;
755 struct x25_sock *x25 = x25_sk(sk);
756 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
757 struct x25_route *rt;
758 int rc = 0;
759
760 lock_sock(sk);
761 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
762 sock->state = SS_CONNECTED;
763 goto out; /* Connect completed during a ERESTARTSYS event */
764 }
765
766 rc = -ECONNREFUSED;
767 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
768 sock->state = SS_UNCONNECTED;
769 goto out;
770 }
771
772 rc = -EISCONN; /* No reconnect on a seqpacket socket */
773 if (sk->sk_state == TCP_ESTABLISHED)
774 goto out;
775
776 rc = -EALREADY; /* Do nothing if call is already in progress */
777 if (sk->sk_state == TCP_SYN_SENT)
778 goto out;
779
780 sk->sk_state = TCP_CLOSE;
781 sock->state = SS_UNCONNECTED;
782
783 rc = -EINVAL;
784 if (addr_len != sizeof(struct sockaddr_x25) ||
785 addr->sx25_family != AF_X25 ||
786 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
787 goto out;
788
789 rc = -ENETUNREACH;
790 rt = x25_get_route(&addr->sx25_addr);
791 if (!rt)
792 goto out;
793
794 x25->neighbour = x25_get_neigh(rt->dev);
795 if (!x25->neighbour)
796 goto out_put_route;
797
798 x25_limit_facilities(&x25->facilities, x25->neighbour);
799
800 x25->lci = x25_new_lci(x25->neighbour);
801 if (!x25->lci)
802 goto out_put_neigh;
803
804 rc = -EINVAL;
805 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
806 goto out_put_neigh;
807
808 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
809 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
810
811 x25->dest_addr = addr->sx25_addr;
812
813 /* Move to connecting socket, start sending Connect Requests */
814 sock->state = SS_CONNECTING;
815 sk->sk_state = TCP_SYN_SENT;
816
817 x25->state = X25_STATE_1;
818
819 x25_write_internal(sk, X25_CALL_REQUEST);
820
821 x25_start_heartbeat(sk);
822 x25_start_t21timer(sk);
823
824 /* Now the loop */
825 rc = -EINPROGRESS;
826 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
827 goto out;
828
829 rc = x25_wait_for_connection_establishment(sk);
830 if (rc)
831 goto out_put_neigh;
832
833 sock->state = SS_CONNECTED;
834 rc = 0;
835 out_put_neigh:
836 if (rc && x25->neighbour) {
837 read_lock_bh(&x25_list_lock);
838 x25_neigh_put(x25->neighbour);
839 x25->neighbour = NULL;
840 read_unlock_bh(&x25_list_lock);
841 x25->state = X25_STATE_0;
842 }
843 out_put_route:
844 x25_route_put(rt);
845 out:
846 release_sock(sk);
847 return rc;
848 }
849
x25_wait_for_data(struct sock * sk,long timeout)850 static int x25_wait_for_data(struct sock *sk, long timeout)
851 {
852 DECLARE_WAITQUEUE(wait, current);
853 int rc = 0;
854
855 add_wait_queue_exclusive(sk_sleep(sk), &wait);
856 for (;;) {
857 __set_current_state(TASK_INTERRUPTIBLE);
858 if (sk->sk_shutdown & RCV_SHUTDOWN)
859 break;
860 rc = -ERESTARTSYS;
861 if (signal_pending(current))
862 break;
863 rc = -EAGAIN;
864 if (!timeout)
865 break;
866 rc = 0;
867 if (skb_queue_empty(&sk->sk_receive_queue)) {
868 release_sock(sk);
869 timeout = schedule_timeout(timeout);
870 lock_sock(sk);
871 } else
872 break;
873 }
874 __set_current_state(TASK_RUNNING);
875 remove_wait_queue(sk_sleep(sk), &wait);
876 return rc;
877 }
878
x25_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)879 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
880 bool kern)
881 {
882 struct sock *sk = sock->sk;
883 struct sock *newsk;
884 struct sk_buff *skb;
885 int rc = -EINVAL;
886
887 if (!sk)
888 goto out;
889
890 rc = -EOPNOTSUPP;
891 if (sk->sk_type != SOCK_SEQPACKET)
892 goto out;
893
894 lock_sock(sk);
895 rc = -EINVAL;
896 if (sk->sk_state != TCP_LISTEN)
897 goto out2;
898
899 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
900 if (rc)
901 goto out2;
902 skb = skb_dequeue(&sk->sk_receive_queue);
903 rc = -EINVAL;
904 if (!skb->sk)
905 goto out2;
906 newsk = skb->sk;
907 sock_graft(newsk, newsock);
908
909 /* Now attach up the new socket */
910 skb->sk = NULL;
911 kfree_skb(skb);
912 sk_acceptq_removed(sk);
913 newsock->state = SS_CONNECTED;
914 rc = 0;
915 out2:
916 release_sock(sk);
917 out:
918 return rc;
919 }
920
x25_getname(struct socket * sock,struct sockaddr * uaddr,int peer)921 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
922 int peer)
923 {
924 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
925 struct sock *sk = sock->sk;
926 struct x25_sock *x25 = x25_sk(sk);
927 int rc = 0;
928
929 if (peer) {
930 if (sk->sk_state != TCP_ESTABLISHED) {
931 rc = -ENOTCONN;
932 goto out;
933 }
934 sx25->sx25_addr = x25->dest_addr;
935 } else
936 sx25->sx25_addr = x25->source_addr;
937
938 sx25->sx25_family = AF_X25;
939 rc = sizeof(*sx25);
940
941 out:
942 return rc;
943 }
944
x25_rx_call_request(struct sk_buff * skb,struct x25_neigh * nb,unsigned int lci)945 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
946 unsigned int lci)
947 {
948 struct sock *sk;
949 struct sock *make;
950 struct x25_sock *makex25;
951 struct x25_address source_addr, dest_addr;
952 struct x25_facilities facilities;
953 struct x25_dte_facilities dte_facilities;
954 int len, addr_len, rc;
955
956 /*
957 * Remove the LCI and frame type.
958 */
959 skb_pull(skb, X25_STD_MIN_LEN);
960
961 /*
962 * Extract the X.25 addresses and convert them to ASCII strings,
963 * and remove them.
964 *
965 * Address block is mandatory in call request packets
966 */
967 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
968 if (addr_len <= 0)
969 goto out_clear_request;
970 skb_pull(skb, addr_len);
971
972 /*
973 * Get the length of the facilities, skip past them for the moment
974 * get the call user data because this is needed to determine
975 * the correct listener
976 *
977 * Facilities length is mandatory in call request packets
978 */
979 if (!pskb_may_pull(skb, 1))
980 goto out_clear_request;
981 len = skb->data[0] + 1;
982 if (!pskb_may_pull(skb, len))
983 goto out_clear_request;
984 skb_pull(skb,len);
985
986 /*
987 * Ensure that the amount of call user data is valid.
988 */
989 if (skb->len > X25_MAX_CUD_LEN)
990 goto out_clear_request;
991
992 /*
993 * Get all the call user data so it can be used in
994 * x25_find_listener and skb_copy_from_linear_data up ahead.
995 */
996 if (!pskb_may_pull(skb, skb->len))
997 goto out_clear_request;
998
999 /*
1000 * Find a listener for the particular address/cud pair.
1001 */
1002 sk = x25_find_listener(&source_addr,skb);
1003 skb_push(skb,len);
1004
1005 if (sk != NULL && sk_acceptq_is_full(sk)) {
1006 goto out_sock_put;
1007 }
1008
1009 /*
1010 * We dont have any listeners for this incoming call.
1011 * Try forwarding it.
1012 */
1013 if (sk == NULL) {
1014 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1015 if (sysctl_x25_forward &&
1016 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1017 {
1018 /* Call was forwarded, dont process it any more */
1019 kfree_skb(skb);
1020 rc = 1;
1021 goto out;
1022 } else {
1023 /* No listeners, can't forward, clear the call */
1024 goto out_clear_request;
1025 }
1026 }
1027
1028 /*
1029 * Try to reach a compromise on the requested facilities.
1030 */
1031 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1032 if (len == -1)
1033 goto out_sock_put;
1034
1035 /*
1036 * current neighbour/link might impose additional limits
1037 * on certain facilties
1038 */
1039
1040 x25_limit_facilities(&facilities, nb);
1041
1042 /*
1043 * Try to create a new socket.
1044 */
1045 make = x25_make_new(sk);
1046 if (!make)
1047 goto out_sock_put;
1048
1049 /*
1050 * Remove the facilities
1051 */
1052 skb_pull(skb, len);
1053
1054 skb->sk = make;
1055 make->sk_state = TCP_ESTABLISHED;
1056
1057 makex25 = x25_sk(make);
1058 makex25->lci = lci;
1059 makex25->dest_addr = dest_addr;
1060 makex25->source_addr = source_addr;
1061 x25_neigh_hold(nb);
1062 makex25->neighbour = nb;
1063 makex25->facilities = facilities;
1064 makex25->dte_facilities= dte_facilities;
1065 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1066 /* ensure no reverse facil on accept */
1067 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1068 /* ensure no calling address extension on accept */
1069 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1070 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1071
1072 /* Normally all calls are accepted immediately */
1073 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1074 x25_write_internal(make, X25_CALL_ACCEPTED);
1075 makex25->state = X25_STATE_3;
1076 } else {
1077 makex25->state = X25_STATE_5;
1078 }
1079
1080 /*
1081 * Incoming Call User Data.
1082 */
1083 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1084 makex25->calluserdata.cudlength = skb->len;
1085
1086 sk_acceptq_added(sk);
1087
1088 x25_insert_socket(make);
1089
1090 skb_queue_head(&sk->sk_receive_queue, skb);
1091
1092 x25_start_heartbeat(make);
1093
1094 if (!sock_flag(sk, SOCK_DEAD))
1095 sk->sk_data_ready(sk);
1096 rc = 1;
1097 sock_put(sk);
1098 out:
1099 return rc;
1100 out_sock_put:
1101 sock_put(sk);
1102 out_clear_request:
1103 rc = 0;
1104 x25_transmit_clear_request(nb, lci, 0x01);
1105 goto out;
1106 }
1107
x25_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)1108 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1109 {
1110 struct sock *sk = sock->sk;
1111 struct x25_sock *x25 = x25_sk(sk);
1112 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1113 struct sockaddr_x25 sx25;
1114 struct sk_buff *skb;
1115 unsigned char *asmptr;
1116 int noblock = msg->msg_flags & MSG_DONTWAIT;
1117 size_t size;
1118 int qbit = 0, rc = -EINVAL;
1119
1120 lock_sock(sk);
1121 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1122 goto out;
1123
1124 /* we currently don't support segmented records at the user interface */
1125 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1126 goto out;
1127
1128 rc = -EADDRNOTAVAIL;
1129 if (sock_flag(sk, SOCK_ZAPPED))
1130 goto out;
1131
1132 rc = -EPIPE;
1133 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1134 send_sig(SIGPIPE, current, 0);
1135 goto out;
1136 }
1137
1138 rc = -ENETUNREACH;
1139 if (!x25->neighbour)
1140 goto out;
1141
1142 if (usx25) {
1143 rc = -EINVAL;
1144 if (msg->msg_namelen < sizeof(sx25))
1145 goto out;
1146 memcpy(&sx25, usx25, sizeof(sx25));
1147 rc = -EISCONN;
1148 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1149 goto out;
1150 rc = -EINVAL;
1151 if (sx25.sx25_family != AF_X25)
1152 goto out;
1153 } else {
1154 /*
1155 * FIXME 1003.1g - if the socket is like this because
1156 * it has become closed (not started closed) we ought
1157 * to SIGPIPE, EPIPE;
1158 */
1159 rc = -ENOTCONN;
1160 if (sk->sk_state != TCP_ESTABLISHED)
1161 goto out;
1162
1163 sx25.sx25_family = AF_X25;
1164 sx25.sx25_addr = x25->dest_addr;
1165 }
1166
1167 /* Sanity check the packet size */
1168 if (len > 65535) {
1169 rc = -EMSGSIZE;
1170 goto out;
1171 }
1172
1173 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1174
1175 /* Build a packet */
1176 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1177
1178 if ((msg->msg_flags & MSG_OOB) && len > 32)
1179 len = 32;
1180
1181 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1182
1183 release_sock(sk);
1184 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1185 lock_sock(sk);
1186 if (!skb)
1187 goto out;
1188 X25_SKB_CB(skb)->flags = msg->msg_flags;
1189
1190 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1191
1192 /*
1193 * Put the data on the end
1194 */
1195 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1196
1197 skb_reset_transport_header(skb);
1198 skb_put(skb, len);
1199
1200 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1201 if (rc)
1202 goto out_kfree_skb;
1203
1204 /*
1205 * If the Q BIT Include socket option is in force, the first
1206 * byte of the user data is the logical value of the Q Bit.
1207 */
1208 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1209 if (!pskb_may_pull(skb, 1))
1210 goto out_kfree_skb;
1211
1212 qbit = skb->data[0];
1213 skb_pull(skb, 1);
1214 }
1215
1216 /*
1217 * Push down the X.25 header
1218 */
1219 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1220
1221 if (msg->msg_flags & MSG_OOB) {
1222 if (x25->neighbour->extended) {
1223 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1224 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1225 *asmptr++ = (x25->lci >> 0) & 0xFF;
1226 *asmptr++ = X25_INTERRUPT;
1227 } else {
1228 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1229 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1230 *asmptr++ = (x25->lci >> 0) & 0xFF;
1231 *asmptr++ = X25_INTERRUPT;
1232 }
1233 } else {
1234 if (x25->neighbour->extended) {
1235 /* Build an Extended X.25 header */
1236 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1237 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1238 *asmptr++ = (x25->lci >> 0) & 0xFF;
1239 *asmptr++ = X25_DATA;
1240 *asmptr++ = X25_DATA;
1241 } else {
1242 /* Build an Standard X.25 header */
1243 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1244 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1245 *asmptr++ = (x25->lci >> 0) & 0xFF;
1246 *asmptr++ = X25_DATA;
1247 }
1248
1249 if (qbit)
1250 skb->data[0] |= X25_Q_BIT;
1251 }
1252
1253 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1254 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1255
1256 rc = -ENOTCONN;
1257 if (sk->sk_state != TCP_ESTABLISHED)
1258 goto out_kfree_skb;
1259
1260 if (msg->msg_flags & MSG_OOB)
1261 skb_queue_tail(&x25->interrupt_out_queue, skb);
1262 else {
1263 rc = x25_output(sk, skb);
1264 len = rc;
1265 if (rc < 0)
1266 kfree_skb(skb);
1267 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1268 len++;
1269 }
1270
1271 x25_kick(sk);
1272 rc = len;
1273 out:
1274 release_sock(sk);
1275 return rc;
1276 out_kfree_skb:
1277 kfree_skb(skb);
1278 goto out;
1279 }
1280
1281
x25_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)1282 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1283 int flags)
1284 {
1285 struct sock *sk = sock->sk;
1286 struct x25_sock *x25 = x25_sk(sk);
1287 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1288 size_t copied;
1289 int qbit, header_len;
1290 struct sk_buff *skb;
1291 unsigned char *asmptr;
1292 int rc = -ENOTCONN;
1293
1294 lock_sock(sk);
1295
1296 if (x25->neighbour == NULL)
1297 goto out;
1298
1299 header_len = x25->neighbour->extended ?
1300 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1301
1302 /*
1303 * This works for seqpacket too. The receiver has ordered the queue for
1304 * us! We do one quick check first though
1305 */
1306 if (sk->sk_state != TCP_ESTABLISHED)
1307 goto out;
1308
1309 if (flags & MSG_OOB) {
1310 rc = -EINVAL;
1311 if (sock_flag(sk, SOCK_URGINLINE) ||
1312 !skb_peek(&x25->interrupt_in_queue))
1313 goto out;
1314
1315 skb = skb_dequeue(&x25->interrupt_in_queue);
1316
1317 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1318 goto out_free_dgram;
1319
1320 skb_pull(skb, X25_STD_MIN_LEN);
1321
1322 /*
1323 * No Q bit information on Interrupt data.
1324 */
1325 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1326 asmptr = skb_push(skb, 1);
1327 *asmptr = 0x00;
1328 }
1329
1330 msg->msg_flags |= MSG_OOB;
1331 } else {
1332 /* Now we can treat all alike */
1333 release_sock(sk);
1334 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1335 flags & MSG_DONTWAIT, &rc);
1336 lock_sock(sk);
1337 if (!skb)
1338 goto out;
1339
1340 if (!pskb_may_pull(skb, header_len))
1341 goto out_free_dgram;
1342
1343 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1344
1345 skb_pull(skb, header_len);
1346
1347 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1348 asmptr = skb_push(skb, 1);
1349 *asmptr = qbit;
1350 }
1351 }
1352
1353 skb_reset_transport_header(skb);
1354 copied = skb->len;
1355
1356 if (copied > size) {
1357 copied = size;
1358 msg->msg_flags |= MSG_TRUNC;
1359 }
1360
1361 /* Currently, each datagram always contains a complete record */
1362 msg->msg_flags |= MSG_EOR;
1363
1364 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1365 if (rc)
1366 goto out_free_dgram;
1367
1368 if (sx25) {
1369 sx25->sx25_family = AF_X25;
1370 sx25->sx25_addr = x25->dest_addr;
1371 msg->msg_namelen = sizeof(*sx25);
1372 }
1373
1374 x25_check_rbuf(sk);
1375 rc = copied;
1376 out_free_dgram:
1377 skb_free_datagram(sk, skb);
1378 out:
1379 release_sock(sk);
1380 return rc;
1381 }
1382
1383
x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1384 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1385 {
1386 struct sock *sk = sock->sk;
1387 struct x25_sock *x25 = x25_sk(sk);
1388 void __user *argp = (void __user *)arg;
1389 int rc;
1390
1391 switch (cmd) {
1392 case TIOCOUTQ: {
1393 int amount;
1394
1395 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1396 if (amount < 0)
1397 amount = 0;
1398 rc = put_user(amount, (unsigned int __user *)argp);
1399 break;
1400 }
1401
1402 case TIOCINQ: {
1403 struct sk_buff *skb;
1404 int amount = 0;
1405 /*
1406 * These two are safe on a single CPU system as
1407 * only user tasks fiddle here
1408 */
1409 lock_sock(sk);
1410 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1411 amount = skb->len;
1412 release_sock(sk);
1413 rc = put_user(amount, (unsigned int __user *)argp);
1414 break;
1415 }
1416
1417 case SIOCGIFADDR:
1418 case SIOCSIFADDR:
1419 case SIOCGIFDSTADDR:
1420 case SIOCSIFDSTADDR:
1421 case SIOCGIFBRDADDR:
1422 case SIOCSIFBRDADDR:
1423 case SIOCGIFNETMASK:
1424 case SIOCSIFNETMASK:
1425 case SIOCGIFMETRIC:
1426 case SIOCSIFMETRIC:
1427 rc = -EINVAL;
1428 break;
1429 case SIOCADDRT:
1430 case SIOCDELRT:
1431 rc = -EPERM;
1432 if (!capable(CAP_NET_ADMIN))
1433 break;
1434 rc = x25_route_ioctl(cmd, argp);
1435 break;
1436 case SIOCX25GSUBSCRIP:
1437 rc = x25_subscr_ioctl(cmd, argp);
1438 break;
1439 case SIOCX25SSUBSCRIP:
1440 rc = -EPERM;
1441 if (!capable(CAP_NET_ADMIN))
1442 break;
1443 rc = x25_subscr_ioctl(cmd, argp);
1444 break;
1445 case SIOCX25GFACILITIES: {
1446 lock_sock(sk);
1447 rc = copy_to_user(argp, &x25->facilities,
1448 sizeof(x25->facilities))
1449 ? -EFAULT : 0;
1450 release_sock(sk);
1451 break;
1452 }
1453
1454 case SIOCX25SFACILITIES: {
1455 struct x25_facilities facilities;
1456 rc = -EFAULT;
1457 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1458 break;
1459 rc = -EINVAL;
1460 lock_sock(sk);
1461 if (sk->sk_state != TCP_LISTEN &&
1462 sk->sk_state != TCP_CLOSE)
1463 goto out_fac_release;
1464 if (facilities.pacsize_in < X25_PS16 ||
1465 facilities.pacsize_in > X25_PS4096)
1466 goto out_fac_release;
1467 if (facilities.pacsize_out < X25_PS16 ||
1468 facilities.pacsize_out > X25_PS4096)
1469 goto out_fac_release;
1470 if (facilities.winsize_in < 1 ||
1471 facilities.winsize_in > 127)
1472 goto out_fac_release;
1473 if (facilities.throughput) {
1474 int out = facilities.throughput & 0xf0;
1475 int in = facilities.throughput & 0x0f;
1476 if (!out)
1477 facilities.throughput |=
1478 X25_DEFAULT_THROUGHPUT << 4;
1479 else if (out < 0x30 || out > 0xD0)
1480 goto out_fac_release;
1481 if (!in)
1482 facilities.throughput |=
1483 X25_DEFAULT_THROUGHPUT;
1484 else if (in < 0x03 || in > 0x0D)
1485 goto out_fac_release;
1486 }
1487 if (facilities.reverse &&
1488 (facilities.reverse & 0x81) != 0x81)
1489 goto out_fac_release;
1490 x25->facilities = facilities;
1491 rc = 0;
1492 out_fac_release:
1493 release_sock(sk);
1494 break;
1495 }
1496
1497 case SIOCX25GDTEFACILITIES: {
1498 lock_sock(sk);
1499 rc = copy_to_user(argp, &x25->dte_facilities,
1500 sizeof(x25->dte_facilities));
1501 release_sock(sk);
1502 if (rc)
1503 rc = -EFAULT;
1504 break;
1505 }
1506
1507 case SIOCX25SDTEFACILITIES: {
1508 struct x25_dte_facilities dtefacs;
1509 rc = -EFAULT;
1510 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1511 break;
1512 rc = -EINVAL;
1513 lock_sock(sk);
1514 if (sk->sk_state != TCP_LISTEN &&
1515 sk->sk_state != TCP_CLOSE)
1516 goto out_dtefac_release;
1517 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1518 goto out_dtefac_release;
1519 if (dtefacs.called_len > X25_MAX_AE_LEN)
1520 goto out_dtefac_release;
1521 x25->dte_facilities = dtefacs;
1522 rc = 0;
1523 out_dtefac_release:
1524 release_sock(sk);
1525 break;
1526 }
1527
1528 case SIOCX25GCALLUSERDATA: {
1529 lock_sock(sk);
1530 rc = copy_to_user(argp, &x25->calluserdata,
1531 sizeof(x25->calluserdata))
1532 ? -EFAULT : 0;
1533 release_sock(sk);
1534 break;
1535 }
1536
1537 case SIOCX25SCALLUSERDATA: {
1538 struct x25_calluserdata calluserdata;
1539
1540 rc = -EFAULT;
1541 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1542 break;
1543 rc = -EINVAL;
1544 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1545 break;
1546 lock_sock(sk);
1547 x25->calluserdata = calluserdata;
1548 release_sock(sk);
1549 rc = 0;
1550 break;
1551 }
1552
1553 case SIOCX25GCAUSEDIAG: {
1554 lock_sock(sk);
1555 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1556 ? -EFAULT : 0;
1557 release_sock(sk);
1558 break;
1559 }
1560
1561 case SIOCX25SCAUSEDIAG: {
1562 struct x25_causediag causediag;
1563 rc = -EFAULT;
1564 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1565 break;
1566 lock_sock(sk);
1567 x25->causediag = causediag;
1568 release_sock(sk);
1569 rc = 0;
1570 break;
1571
1572 }
1573
1574 case SIOCX25SCUDMATCHLEN: {
1575 struct x25_subaddr sub_addr;
1576 rc = -EINVAL;
1577 lock_sock(sk);
1578 if(sk->sk_state != TCP_CLOSE)
1579 goto out_cud_release;
1580 rc = -EFAULT;
1581 if (copy_from_user(&sub_addr, argp,
1582 sizeof(sub_addr)))
1583 goto out_cud_release;
1584 rc = -EINVAL;
1585 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1586 goto out_cud_release;
1587 x25->cudmatchlength = sub_addr.cudmatchlength;
1588 rc = 0;
1589 out_cud_release:
1590 release_sock(sk);
1591 break;
1592 }
1593
1594 case SIOCX25CALLACCPTAPPRV: {
1595 rc = -EINVAL;
1596 lock_sock(sk);
1597 if (sk->sk_state == TCP_CLOSE) {
1598 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1599 rc = 0;
1600 }
1601 release_sock(sk);
1602 break;
1603 }
1604
1605 case SIOCX25SENDCALLACCPT: {
1606 rc = -EINVAL;
1607 lock_sock(sk);
1608 if (sk->sk_state != TCP_ESTABLISHED)
1609 goto out_sendcallaccpt_release;
1610 /* must call accptapprv above */
1611 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1612 goto out_sendcallaccpt_release;
1613 x25_write_internal(sk, X25_CALL_ACCEPTED);
1614 x25->state = X25_STATE_3;
1615 rc = 0;
1616 out_sendcallaccpt_release:
1617 release_sock(sk);
1618 break;
1619 }
1620
1621 default:
1622 rc = -ENOIOCTLCMD;
1623 break;
1624 }
1625
1626 return rc;
1627 }
1628
1629 static const struct net_proto_family x25_family_ops = {
1630 .family = AF_X25,
1631 .create = x25_create,
1632 .owner = THIS_MODULE,
1633 };
1634
1635 #ifdef CONFIG_COMPAT
compat_x25_subscr_ioctl(unsigned int cmd,struct compat_x25_subscrip_struct __user * x25_subscr32)1636 static int compat_x25_subscr_ioctl(unsigned int cmd,
1637 struct compat_x25_subscrip_struct __user *x25_subscr32)
1638 {
1639 struct compat_x25_subscrip_struct x25_subscr;
1640 struct x25_neigh *nb;
1641 struct net_device *dev;
1642 int rc = -EINVAL;
1643
1644 rc = -EFAULT;
1645 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1646 goto out;
1647
1648 rc = -EINVAL;
1649 dev = x25_dev_get(x25_subscr.device);
1650 if (dev == NULL)
1651 goto out;
1652
1653 nb = x25_get_neigh(dev);
1654 if (nb == NULL)
1655 goto out_dev_put;
1656
1657 dev_put(dev);
1658
1659 if (cmd == SIOCX25GSUBSCRIP) {
1660 read_lock_bh(&x25_neigh_list_lock);
1661 x25_subscr.extended = nb->extended;
1662 x25_subscr.global_facil_mask = nb->global_facil_mask;
1663 read_unlock_bh(&x25_neigh_list_lock);
1664 rc = copy_to_user(x25_subscr32, &x25_subscr,
1665 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1666 } else {
1667 rc = -EINVAL;
1668 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1669 rc = 0;
1670 write_lock_bh(&x25_neigh_list_lock);
1671 nb->extended = x25_subscr.extended;
1672 nb->global_facil_mask = x25_subscr.global_facil_mask;
1673 write_unlock_bh(&x25_neigh_list_lock);
1674 }
1675 }
1676 x25_neigh_put(nb);
1677 out:
1678 return rc;
1679 out_dev_put:
1680 dev_put(dev);
1681 goto out;
1682 }
1683
compat_x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1684 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1685 unsigned long arg)
1686 {
1687 void __user *argp = compat_ptr(arg);
1688 int rc = -ENOIOCTLCMD;
1689
1690 switch(cmd) {
1691 case TIOCOUTQ:
1692 case TIOCINQ:
1693 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1694 break;
1695 case SIOCGIFADDR:
1696 case SIOCSIFADDR:
1697 case SIOCGIFDSTADDR:
1698 case SIOCSIFDSTADDR:
1699 case SIOCGIFBRDADDR:
1700 case SIOCSIFBRDADDR:
1701 case SIOCGIFNETMASK:
1702 case SIOCSIFNETMASK:
1703 case SIOCGIFMETRIC:
1704 case SIOCSIFMETRIC:
1705 rc = -EINVAL;
1706 break;
1707 case SIOCADDRT:
1708 case SIOCDELRT:
1709 rc = -EPERM;
1710 if (!capable(CAP_NET_ADMIN))
1711 break;
1712 rc = x25_route_ioctl(cmd, argp);
1713 break;
1714 case SIOCX25GSUBSCRIP:
1715 rc = compat_x25_subscr_ioctl(cmd, argp);
1716 break;
1717 case SIOCX25SSUBSCRIP:
1718 rc = -EPERM;
1719 if (!capable(CAP_NET_ADMIN))
1720 break;
1721 rc = compat_x25_subscr_ioctl(cmd, argp);
1722 break;
1723 case SIOCX25GFACILITIES:
1724 case SIOCX25SFACILITIES:
1725 case SIOCX25GDTEFACILITIES:
1726 case SIOCX25SDTEFACILITIES:
1727 case SIOCX25GCALLUSERDATA:
1728 case SIOCX25SCALLUSERDATA:
1729 case SIOCX25GCAUSEDIAG:
1730 case SIOCX25SCAUSEDIAG:
1731 case SIOCX25SCUDMATCHLEN:
1732 case SIOCX25CALLACCPTAPPRV:
1733 case SIOCX25SENDCALLACCPT:
1734 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1735 break;
1736 default:
1737 rc = -ENOIOCTLCMD;
1738 break;
1739 }
1740 return rc;
1741 }
1742 #endif
1743
1744 static const struct proto_ops x25_proto_ops = {
1745 .family = AF_X25,
1746 .owner = THIS_MODULE,
1747 .release = x25_release,
1748 .bind = x25_bind,
1749 .connect = x25_connect,
1750 .socketpair = sock_no_socketpair,
1751 .accept = x25_accept,
1752 .getname = x25_getname,
1753 .poll = datagram_poll,
1754 .ioctl = x25_ioctl,
1755 #ifdef CONFIG_COMPAT
1756 .compat_ioctl = compat_x25_ioctl,
1757 #endif
1758 .gettstamp = sock_gettstamp,
1759 .listen = x25_listen,
1760 .shutdown = sock_no_shutdown,
1761 .setsockopt = x25_setsockopt,
1762 .getsockopt = x25_getsockopt,
1763 .sendmsg = x25_sendmsg,
1764 .recvmsg = x25_recvmsg,
1765 .mmap = sock_no_mmap,
1766 .sendpage = sock_no_sendpage,
1767 };
1768
1769 static struct packet_type x25_packet_type __read_mostly = {
1770 .type = cpu_to_be16(ETH_P_X25),
1771 .func = x25_lapb_receive_frame,
1772 };
1773
1774 static struct notifier_block x25_dev_notifier = {
1775 .notifier_call = x25_device_event,
1776 };
1777
x25_kill_by_neigh(struct x25_neigh * nb)1778 void x25_kill_by_neigh(struct x25_neigh *nb)
1779 {
1780 struct sock *s;
1781
1782 write_lock_bh(&x25_list_lock);
1783
1784 sk_for_each(s, &x25_list) {
1785 if (x25_sk(s)->neighbour == nb) {
1786 write_unlock_bh(&x25_list_lock);
1787 lock_sock(s);
1788 x25_disconnect(s, ENETUNREACH, 0, 0);
1789 release_sock(s);
1790 write_lock_bh(&x25_list_lock);
1791 }
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;
1802
1803 rc = proto_register(&x25_proto, 0);
1804 if (rc)
1805 goto out;
1806
1807 rc = sock_register(&x25_family_ops);
1808 if (rc)
1809 goto out_proto;
1810
1811 dev_add_pack(&x25_packet_type);
1812
1813 rc = register_netdevice_notifier(&x25_dev_notifier);
1814 if (rc)
1815 goto out_sock;
1816
1817 rc = x25_register_sysctl();
1818 if (rc)
1819 goto out_dev;
1820
1821 rc = x25_proc_init();
1822 if (rc)
1823 goto out_sysctl;
1824
1825 pr_info("Linux Version 0.2\n");
1826
1827 out:
1828 return rc;
1829 out_sysctl:
1830 x25_unregister_sysctl();
1831 out_dev:
1832 unregister_netdevice_notifier(&x25_dev_notifier);
1833 out_sock:
1834 dev_remove_pack(&x25_packet_type);
1835 sock_unregister(AF_X25);
1836 out_proto:
1837 proto_unregister(&x25_proto);
1838 goto out;
1839 }
1840 module_init(x25_init);
1841
x25_exit(void)1842 static void __exit x25_exit(void)
1843 {
1844 x25_proc_exit();
1845 x25_link_free();
1846 x25_route_free();
1847
1848 x25_unregister_sysctl();
1849
1850 unregister_netdevice_notifier(&x25_dev_notifier);
1851
1852 dev_remove_pack(&x25_packet_type);
1853
1854 sock_unregister(AF_X25);
1855 proto_unregister(&x25_proto);
1856 }
1857 module_exit(x25_exit);
1858
1859 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1860 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1861 MODULE_LICENSE("GPL");
1862 MODULE_ALIAS_NETPROTO(PF_X25);
1863