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 * Handle device status changes.
204 */
x25_device_event(struct notifier_block * this,unsigned long event,void * ptr)205 static int x25_device_event(struct notifier_block *this, unsigned long event,
206 void *ptr)
207 {
208 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
209 struct x25_neigh *nb;
210
211 if (!net_eq(dev_net(dev), &init_net))
212 return NOTIFY_DONE;
213
214 if (dev->type == ARPHRD_X25) {
215 switch (event) {
216 case NETDEV_REGISTER:
217 case NETDEV_POST_TYPE_CHANGE:
218 x25_link_device_up(dev);
219 break;
220 case NETDEV_DOWN:
221 nb = x25_get_neigh(dev);
222 if (nb) {
223 x25_link_terminated(nb);
224 x25_neigh_put(nb);
225 }
226 x25_route_device_down(dev);
227 break;
228 case NETDEV_PRE_TYPE_CHANGE:
229 case NETDEV_UNREGISTER:
230 x25_link_device_down(dev);
231 break;
232 case NETDEV_CHANGE:
233 if (!netif_carrier_ok(dev)) {
234 nb = x25_get_neigh(dev);
235 if (nb) {
236 x25_link_terminated(nb);
237 x25_neigh_put(nb);
238 }
239 }
240 break;
241 }
242 }
243
244 return NOTIFY_DONE;
245 }
246
247 /*
248 * Add a socket to the bound sockets list.
249 */
x25_insert_socket(struct sock * sk)250 static void x25_insert_socket(struct sock *sk)
251 {
252 write_lock_bh(&x25_list_lock);
253 sk_add_node(sk, &x25_list);
254 write_unlock_bh(&x25_list_lock);
255 }
256
257 /*
258 * Find a socket that wants to accept the Call Request we just
259 * received. Check the full list for an address/cud match.
260 * If no cuds match return the next_best thing, an address match.
261 * Note: if a listening socket has cud set it must only get calls
262 * with matching cud.
263 */
x25_find_listener(struct x25_address * addr,struct sk_buff * skb)264 static struct sock *x25_find_listener(struct x25_address *addr,
265 struct sk_buff *skb)
266 {
267 struct sock *s;
268 struct sock *next_best;
269
270 read_lock_bh(&x25_list_lock);
271 next_best = NULL;
272
273 sk_for_each(s, &x25_list)
274 if ((!strcmp(addr->x25_addr,
275 x25_sk(s)->source_addr.x25_addr) ||
276 !strcmp(x25_sk(s)->source_addr.x25_addr,
277 null_x25_address.x25_addr)) &&
278 s->sk_state == TCP_LISTEN) {
279 /*
280 * Found a listening socket, now check the incoming
281 * call user data vs this sockets call user data
282 */
283 if (x25_sk(s)->cudmatchlength > 0 &&
284 skb->len >= x25_sk(s)->cudmatchlength) {
285 if((memcmp(x25_sk(s)->calluserdata.cuddata,
286 skb->data,
287 x25_sk(s)->cudmatchlength)) == 0) {
288 sock_hold(s);
289 goto found;
290 }
291 } else
292 next_best = s;
293 }
294 if (next_best) {
295 s = next_best;
296 sock_hold(s);
297 goto found;
298 }
299 s = NULL;
300 found:
301 read_unlock_bh(&x25_list_lock);
302 return s;
303 }
304
305 /*
306 * Find a connected X.25 socket given my LCI and neighbour.
307 */
__x25_find_socket(unsigned int lci,struct x25_neigh * nb)308 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
309 {
310 struct sock *s;
311
312 sk_for_each(s, &x25_list)
313 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
314 sock_hold(s);
315 goto found;
316 }
317 s = NULL;
318 found:
319 return s;
320 }
321
x25_find_socket(unsigned int lci,struct x25_neigh * nb)322 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
323 {
324 struct sock *s;
325
326 read_lock_bh(&x25_list_lock);
327 s = __x25_find_socket(lci, nb);
328 read_unlock_bh(&x25_list_lock);
329 return s;
330 }
331
332 /*
333 * Find a unique LCI for a given device.
334 */
x25_new_lci(struct x25_neigh * nb)335 static unsigned int x25_new_lci(struct x25_neigh *nb)
336 {
337 unsigned int lci = 1;
338 struct sock *sk;
339
340 while ((sk = x25_find_socket(lci, nb)) != NULL) {
341 sock_put(sk);
342 if (++lci == 4096) {
343 lci = 0;
344 break;
345 }
346 cond_resched();
347 }
348
349 return lci;
350 }
351
352 /*
353 * Deferred destroy.
354 */
355 static void __x25_destroy_socket(struct sock *);
356
357 /*
358 * handler for deferred kills.
359 */
x25_destroy_timer(struct timer_list * t)360 static void x25_destroy_timer(struct timer_list *t)
361 {
362 struct sock *sk = from_timer(sk, t, sk_timer);
363
364 x25_destroy_socket_from_timer(sk);
365 }
366
367 /*
368 * This is called from user mode and the timers. Thus it protects itself
369 * against interrupt users but doesn't worry about being called during
370 * work. Once it is removed from the queue no interrupt or bottom half
371 * will touch it and we are (fairly 8-) ) safe.
372 * Not static as it's used by the timer
373 */
__x25_destroy_socket(struct sock * sk)374 static void __x25_destroy_socket(struct sock *sk)
375 {
376 struct sk_buff *skb;
377
378 x25_stop_heartbeat(sk);
379 x25_stop_timer(sk);
380
381 x25_remove_socket(sk);
382 x25_clear_queues(sk); /* Flush the queues */
383
384 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
385 if (skb->sk != sk) { /* A pending connection */
386 /*
387 * Queue the unaccepted socket for death
388 */
389 skb->sk->sk_state = TCP_LISTEN;
390 sock_set_flag(skb->sk, SOCK_DEAD);
391 x25_start_heartbeat(skb->sk);
392 x25_sk(skb->sk)->state = X25_STATE_0;
393 }
394
395 kfree_skb(skb);
396 }
397
398 if (sk_has_allocations(sk)) {
399 /* Defer: outstanding buffers */
400 sk->sk_timer.expires = jiffies + 10 * HZ;
401 sk->sk_timer.function = x25_destroy_timer;
402 add_timer(&sk->sk_timer);
403 } else {
404 /* drop last reference so sock_put will free */
405 __sock_put(sk);
406 }
407 }
408
x25_destroy_socket_from_timer(struct sock * sk)409 void x25_destroy_socket_from_timer(struct sock *sk)
410 {
411 sock_hold(sk);
412 bh_lock_sock(sk);
413 __x25_destroy_socket(sk);
414 bh_unlock_sock(sk);
415 sock_put(sk);
416 }
417
418 /*
419 * Handling for system calls applied via the various interfaces to a
420 * X.25 socket object.
421 */
422
x25_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)423 static int x25_setsockopt(struct socket *sock, int level, int optname,
424 sockptr_t optval, unsigned int optlen)
425 {
426 int opt;
427 struct sock *sk = sock->sk;
428 int rc = -ENOPROTOOPT;
429
430 if (level != SOL_X25 || optname != X25_QBITINCL)
431 goto out;
432
433 rc = -EINVAL;
434 if (optlen < sizeof(int))
435 goto out;
436
437 rc = -EFAULT;
438 if (copy_from_sockptr(&opt, optval, sizeof(int)))
439 goto out;
440
441 if (opt)
442 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
443 else
444 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
445 rc = 0;
446 out:
447 return rc;
448 }
449
x25_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)450 static int x25_getsockopt(struct socket *sock, int level, int optname,
451 char __user *optval, int __user *optlen)
452 {
453 struct sock *sk = sock->sk;
454 int val, len, rc = -ENOPROTOOPT;
455
456 if (level != SOL_X25 || optname != X25_QBITINCL)
457 goto out;
458
459 rc = -EFAULT;
460 if (get_user(len, optlen))
461 goto out;
462
463 len = min_t(unsigned int, len, sizeof(int));
464
465 rc = -EINVAL;
466 if (len < 0)
467 goto out;
468
469 rc = -EFAULT;
470 if (put_user(len, optlen))
471 goto out;
472
473 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
474 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
475 out:
476 return rc;
477 }
478
x25_listen(struct socket * sock,int backlog)479 static int x25_listen(struct socket *sock, int backlog)
480 {
481 struct sock *sk = sock->sk;
482 int rc = -EOPNOTSUPP;
483
484 lock_sock(sk);
485 if (sk->sk_state != TCP_LISTEN) {
486 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
487 sk->sk_max_ack_backlog = backlog;
488 sk->sk_state = TCP_LISTEN;
489 rc = 0;
490 }
491 release_sock(sk);
492
493 return rc;
494 }
495
496 static struct proto x25_proto = {
497 .name = "X25",
498 .owner = THIS_MODULE,
499 .obj_size = sizeof(struct x25_sock),
500 };
501
x25_alloc_socket(struct net * net,int kern)502 static struct sock *x25_alloc_socket(struct net *net, int kern)
503 {
504 struct x25_sock *x25;
505 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
506
507 if (!sk)
508 goto out;
509
510 sock_init_data(NULL, sk);
511
512 x25 = x25_sk(sk);
513 skb_queue_head_init(&x25->ack_queue);
514 skb_queue_head_init(&x25->fragment_queue);
515 skb_queue_head_init(&x25->interrupt_in_queue);
516 skb_queue_head_init(&x25->interrupt_out_queue);
517 out:
518 return sk;
519 }
520
x25_create(struct net * net,struct socket * sock,int protocol,int kern)521 static int x25_create(struct net *net, struct socket *sock, int protocol,
522 int kern)
523 {
524 struct sock *sk;
525 struct x25_sock *x25;
526 int rc = -EAFNOSUPPORT;
527
528 if (!net_eq(net, &init_net))
529 goto out;
530
531 rc = -ESOCKTNOSUPPORT;
532 if (sock->type != SOCK_SEQPACKET)
533 goto out;
534
535 rc = -EINVAL;
536 if (protocol)
537 goto out;
538
539 rc = -ENOBUFS;
540 if ((sk = x25_alloc_socket(net, kern)) == NULL)
541 goto out;
542
543 x25 = x25_sk(sk);
544
545 sock_init_data(sock, sk);
546
547 x25_init_timers(sk);
548
549 sock->ops = &x25_proto_ops;
550 sk->sk_protocol = protocol;
551 sk->sk_backlog_rcv = x25_backlog_rcv;
552
553 x25->t21 = sysctl_x25_call_request_timeout;
554 x25->t22 = sysctl_x25_reset_request_timeout;
555 x25->t23 = sysctl_x25_clear_request_timeout;
556 x25->t2 = sysctl_x25_ack_holdback_timeout;
557 x25->state = X25_STATE_0;
558 x25->cudmatchlength = 0;
559 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
560 /* on call accept */
561
562 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
563 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
564 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
565 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
566 x25->facilities.throughput = 0; /* by default don't negotiate
567 throughput */
568 x25->facilities.reverse = X25_DEFAULT_REVERSE;
569 x25->dte_facilities.calling_len = 0;
570 x25->dte_facilities.called_len = 0;
571 memset(x25->dte_facilities.called_ae, '\0',
572 sizeof(x25->dte_facilities.called_ae));
573 memset(x25->dte_facilities.calling_ae, '\0',
574 sizeof(x25->dte_facilities.calling_ae));
575
576 rc = 0;
577 out:
578 return rc;
579 }
580
x25_make_new(struct sock * osk)581 static struct sock *x25_make_new(struct sock *osk)
582 {
583 struct sock *sk = NULL;
584 struct x25_sock *x25, *ox25;
585
586 if (osk->sk_type != SOCK_SEQPACKET)
587 goto out;
588
589 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
590 goto out;
591
592 x25 = x25_sk(sk);
593
594 sk->sk_type = osk->sk_type;
595 sk->sk_priority = osk->sk_priority;
596 sk->sk_protocol = osk->sk_protocol;
597 sk->sk_rcvbuf = osk->sk_rcvbuf;
598 sk->sk_sndbuf = osk->sk_sndbuf;
599 sk->sk_state = TCP_ESTABLISHED;
600 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
601 sock_copy_flags(sk, osk);
602
603 ox25 = x25_sk(osk);
604 x25->t21 = ox25->t21;
605 x25->t22 = ox25->t22;
606 x25->t23 = ox25->t23;
607 x25->t2 = ox25->t2;
608 x25->flags = ox25->flags;
609 x25->facilities = ox25->facilities;
610 x25->dte_facilities = ox25->dte_facilities;
611 x25->cudmatchlength = ox25->cudmatchlength;
612
613 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
614 x25_init_timers(sk);
615 out:
616 return sk;
617 }
618
x25_release(struct socket * sock)619 static int x25_release(struct socket *sock)
620 {
621 struct sock *sk = sock->sk;
622 struct x25_sock *x25;
623
624 if (!sk)
625 return 0;
626
627 x25 = x25_sk(sk);
628
629 sock_hold(sk);
630 lock_sock(sk);
631 switch (x25->state) {
632
633 case X25_STATE_0:
634 case X25_STATE_2:
635 x25_disconnect(sk, 0, 0, 0);
636 __x25_destroy_socket(sk);
637 goto out;
638
639 case X25_STATE_1:
640 case X25_STATE_3:
641 case X25_STATE_4:
642 x25_clear_queues(sk);
643 x25_write_internal(sk, X25_CLEAR_REQUEST);
644 x25_start_t23timer(sk);
645 x25->state = X25_STATE_2;
646 sk->sk_state = TCP_CLOSE;
647 sk->sk_shutdown |= SEND_SHUTDOWN;
648 sk->sk_state_change(sk);
649 sock_set_flag(sk, SOCK_DEAD);
650 sock_set_flag(sk, SOCK_DESTROY);
651 break;
652
653 case X25_STATE_5:
654 x25_write_internal(sk, X25_CLEAR_REQUEST);
655 x25_disconnect(sk, 0, 0, 0);
656 __x25_destroy_socket(sk);
657 goto out;
658 }
659
660 sock_orphan(sk);
661 out:
662 release_sock(sk);
663 sock_put(sk);
664 return 0;
665 }
666
x25_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)667 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
668 {
669 struct sock *sk = sock->sk;
670 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
671 int len, i, rc = 0;
672
673 if (addr_len != sizeof(struct sockaddr_x25) ||
674 addr->sx25_family != AF_X25 ||
675 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
676 rc = -EINVAL;
677 goto out;
678 }
679
680 /* check for the null_x25_address */
681 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
682
683 len = strlen(addr->sx25_addr.x25_addr);
684 for (i = 0; i < len; i++) {
685 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
686 rc = -EINVAL;
687 goto out;
688 }
689 }
690 }
691
692 lock_sock(sk);
693 if (sock_flag(sk, SOCK_ZAPPED)) {
694 x25_sk(sk)->source_addr = addr->sx25_addr;
695 x25_insert_socket(sk);
696 sock_reset_flag(sk, SOCK_ZAPPED);
697 } else {
698 rc = -EINVAL;
699 }
700 release_sock(sk);
701 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
702 out:
703 return rc;
704 }
705
x25_wait_for_connection_establishment(struct sock * sk)706 static int x25_wait_for_connection_establishment(struct sock *sk)
707 {
708 DECLARE_WAITQUEUE(wait, current);
709 int rc;
710
711 add_wait_queue_exclusive(sk_sleep(sk), &wait);
712 for (;;) {
713 __set_current_state(TASK_INTERRUPTIBLE);
714 rc = -ERESTARTSYS;
715 if (signal_pending(current))
716 break;
717 rc = sock_error(sk);
718 if (rc) {
719 sk->sk_socket->state = SS_UNCONNECTED;
720 break;
721 }
722 rc = 0;
723 if (sk->sk_state != TCP_ESTABLISHED) {
724 release_sock(sk);
725 schedule();
726 lock_sock(sk);
727 } else
728 break;
729 }
730 __set_current_state(TASK_RUNNING);
731 remove_wait_queue(sk_sleep(sk), &wait);
732 return rc;
733 }
734
x25_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)735 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
736 int addr_len, int flags)
737 {
738 struct sock *sk = sock->sk;
739 struct x25_sock *x25 = x25_sk(sk);
740 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
741 struct x25_route *rt;
742 int rc = 0;
743
744 lock_sock(sk);
745 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
746 sock->state = SS_CONNECTED;
747 goto out; /* Connect completed during a ERESTARTSYS event */
748 }
749
750 rc = -ECONNREFUSED;
751 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
752 sock->state = SS_UNCONNECTED;
753 goto out;
754 }
755
756 rc = -EISCONN; /* No reconnect on a seqpacket socket */
757 if (sk->sk_state == TCP_ESTABLISHED)
758 goto out;
759
760 rc = -EALREADY; /* Do nothing if call is already in progress */
761 if (sk->sk_state == TCP_SYN_SENT)
762 goto out;
763
764 sk->sk_state = TCP_CLOSE;
765 sock->state = SS_UNCONNECTED;
766
767 rc = -EINVAL;
768 if (addr_len != sizeof(struct sockaddr_x25) ||
769 addr->sx25_family != AF_X25 ||
770 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
771 goto out;
772
773 rc = -ENETUNREACH;
774 rt = x25_get_route(&addr->sx25_addr);
775 if (!rt)
776 goto out;
777
778 x25->neighbour = x25_get_neigh(rt->dev);
779 if (!x25->neighbour)
780 goto out_put_route;
781
782 x25_limit_facilities(&x25->facilities, x25->neighbour);
783
784 x25->lci = x25_new_lci(x25->neighbour);
785 if (!x25->lci)
786 goto out_put_neigh;
787
788 rc = -EINVAL;
789 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
790 goto out_put_neigh;
791
792 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
793 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
794
795 x25->dest_addr = addr->sx25_addr;
796
797 /* Move to connecting socket, start sending Connect Requests */
798 sock->state = SS_CONNECTING;
799 sk->sk_state = TCP_SYN_SENT;
800
801 x25->state = X25_STATE_1;
802
803 x25_write_internal(sk, X25_CALL_REQUEST);
804
805 x25_start_heartbeat(sk);
806 x25_start_t21timer(sk);
807
808 /* Now the loop */
809 rc = -EINPROGRESS;
810 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
811 goto out;
812
813 rc = x25_wait_for_connection_establishment(sk);
814 if (rc)
815 goto out_put_neigh;
816
817 sock->state = SS_CONNECTED;
818 rc = 0;
819 out_put_neigh:
820 if (rc && x25->neighbour) {
821 read_lock_bh(&x25_list_lock);
822 x25_neigh_put(x25->neighbour);
823 x25->neighbour = NULL;
824 read_unlock_bh(&x25_list_lock);
825 x25->state = X25_STATE_0;
826 }
827 out_put_route:
828 x25_route_put(rt);
829 out:
830 release_sock(sk);
831 return rc;
832 }
833
x25_wait_for_data(struct sock * sk,long timeout)834 static int x25_wait_for_data(struct sock *sk, long timeout)
835 {
836 DECLARE_WAITQUEUE(wait, current);
837 int rc = 0;
838
839 add_wait_queue_exclusive(sk_sleep(sk), &wait);
840 for (;;) {
841 __set_current_state(TASK_INTERRUPTIBLE);
842 if (sk->sk_shutdown & RCV_SHUTDOWN)
843 break;
844 rc = -ERESTARTSYS;
845 if (signal_pending(current))
846 break;
847 rc = -EAGAIN;
848 if (!timeout)
849 break;
850 rc = 0;
851 if (skb_queue_empty(&sk->sk_receive_queue)) {
852 release_sock(sk);
853 timeout = schedule_timeout(timeout);
854 lock_sock(sk);
855 } else
856 break;
857 }
858 __set_current_state(TASK_RUNNING);
859 remove_wait_queue(sk_sleep(sk), &wait);
860 return rc;
861 }
862
x25_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)863 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
864 bool kern)
865 {
866 struct sock *sk = sock->sk;
867 struct sock *newsk;
868 struct sk_buff *skb;
869 int rc = -EINVAL;
870
871 if (!sk)
872 goto out;
873
874 rc = -EOPNOTSUPP;
875 if (sk->sk_type != SOCK_SEQPACKET)
876 goto out;
877
878 lock_sock(sk);
879 rc = -EINVAL;
880 if (sk->sk_state != TCP_LISTEN)
881 goto out2;
882
883 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
884 if (rc)
885 goto out2;
886 skb = skb_dequeue(&sk->sk_receive_queue);
887 rc = -EINVAL;
888 if (!skb->sk)
889 goto out2;
890 newsk = skb->sk;
891 sock_graft(newsk, newsock);
892
893 /* Now attach up the new socket */
894 skb->sk = NULL;
895 kfree_skb(skb);
896 sk_acceptq_removed(sk);
897 newsock->state = SS_CONNECTED;
898 rc = 0;
899 out2:
900 release_sock(sk);
901 out:
902 return rc;
903 }
904
x25_getname(struct socket * sock,struct sockaddr * uaddr,int peer)905 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
906 int peer)
907 {
908 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
909 struct sock *sk = sock->sk;
910 struct x25_sock *x25 = x25_sk(sk);
911 int rc = 0;
912
913 if (peer) {
914 if (sk->sk_state != TCP_ESTABLISHED) {
915 rc = -ENOTCONN;
916 goto out;
917 }
918 sx25->sx25_addr = x25->dest_addr;
919 } else
920 sx25->sx25_addr = x25->source_addr;
921
922 sx25->sx25_family = AF_X25;
923 rc = sizeof(*sx25);
924
925 out:
926 return rc;
927 }
928
x25_rx_call_request(struct sk_buff * skb,struct x25_neigh * nb,unsigned int lci)929 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
930 unsigned int lci)
931 {
932 struct sock *sk;
933 struct sock *make;
934 struct x25_sock *makex25;
935 struct x25_address source_addr, dest_addr;
936 struct x25_facilities facilities;
937 struct x25_dte_facilities dte_facilities;
938 int len, addr_len, rc;
939
940 /*
941 * Remove the LCI and frame type.
942 */
943 skb_pull(skb, X25_STD_MIN_LEN);
944
945 /*
946 * Extract the X.25 addresses and convert them to ASCII strings,
947 * and remove them.
948 *
949 * Address block is mandatory in call request packets
950 */
951 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
952 if (addr_len <= 0)
953 goto out_clear_request;
954 skb_pull(skb, addr_len);
955
956 /*
957 * Get the length of the facilities, skip past them for the moment
958 * get the call user data because this is needed to determine
959 * the correct listener
960 *
961 * Facilities length is mandatory in call request packets
962 */
963 if (!pskb_may_pull(skb, 1))
964 goto out_clear_request;
965 len = skb->data[0] + 1;
966 if (!pskb_may_pull(skb, len))
967 goto out_clear_request;
968 skb_pull(skb,len);
969
970 /*
971 * Ensure that the amount of call user data is valid.
972 */
973 if (skb->len > X25_MAX_CUD_LEN)
974 goto out_clear_request;
975
976 /*
977 * Get all the call user data so it can be used in
978 * x25_find_listener and skb_copy_from_linear_data up ahead.
979 */
980 if (!pskb_may_pull(skb, skb->len))
981 goto out_clear_request;
982
983 /*
984 * Find a listener for the particular address/cud pair.
985 */
986 sk = x25_find_listener(&source_addr,skb);
987 skb_push(skb,len);
988
989 if (sk != NULL && sk_acceptq_is_full(sk)) {
990 goto out_sock_put;
991 }
992
993 /*
994 * We dont have any listeners for this incoming call.
995 * Try forwarding it.
996 */
997 if (sk == NULL) {
998 skb_push(skb, addr_len + X25_STD_MIN_LEN);
999 if (sysctl_x25_forward &&
1000 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1001 {
1002 /* Call was forwarded, dont process it any more */
1003 kfree_skb(skb);
1004 rc = 1;
1005 goto out;
1006 } else {
1007 /* No listeners, can't forward, clear the call */
1008 goto out_clear_request;
1009 }
1010 }
1011
1012 /*
1013 * Try to reach a compromise on the requested facilities.
1014 */
1015 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1016 if (len == -1)
1017 goto out_sock_put;
1018
1019 /*
1020 * current neighbour/link might impose additional limits
1021 * on certain facilities
1022 */
1023
1024 x25_limit_facilities(&facilities, nb);
1025
1026 /*
1027 * Try to create a new socket.
1028 */
1029 make = x25_make_new(sk);
1030 if (!make)
1031 goto out_sock_put;
1032
1033 /*
1034 * Remove the facilities
1035 */
1036 skb_pull(skb, len);
1037
1038 skb->sk = make;
1039 make->sk_state = TCP_ESTABLISHED;
1040
1041 makex25 = x25_sk(make);
1042 makex25->lci = lci;
1043 makex25->dest_addr = dest_addr;
1044 makex25->source_addr = source_addr;
1045 x25_neigh_hold(nb);
1046 makex25->neighbour = nb;
1047 makex25->facilities = facilities;
1048 makex25->dte_facilities= dte_facilities;
1049 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1050 /* ensure no reverse facil on accept */
1051 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1052 /* ensure no calling address extension on accept */
1053 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1054 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1055
1056 /* Normally all calls are accepted immediately */
1057 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1058 x25_write_internal(make, X25_CALL_ACCEPTED);
1059 makex25->state = X25_STATE_3;
1060 } else {
1061 makex25->state = X25_STATE_5;
1062 }
1063
1064 /*
1065 * Incoming Call User Data.
1066 */
1067 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1068 makex25->calluserdata.cudlength = skb->len;
1069
1070 sk_acceptq_added(sk);
1071
1072 x25_insert_socket(make);
1073
1074 skb_queue_head(&sk->sk_receive_queue, skb);
1075
1076 x25_start_heartbeat(make);
1077
1078 if (!sock_flag(sk, SOCK_DEAD))
1079 sk->sk_data_ready(sk);
1080 rc = 1;
1081 sock_put(sk);
1082 out:
1083 return rc;
1084 out_sock_put:
1085 sock_put(sk);
1086 out_clear_request:
1087 rc = 0;
1088 x25_transmit_clear_request(nb, lci, 0x01);
1089 goto out;
1090 }
1091
x25_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)1092 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1093 {
1094 struct sock *sk = sock->sk;
1095 struct x25_sock *x25 = x25_sk(sk);
1096 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1097 struct sockaddr_x25 sx25;
1098 struct sk_buff *skb;
1099 unsigned char *asmptr;
1100 int noblock = msg->msg_flags & MSG_DONTWAIT;
1101 size_t size;
1102 int qbit = 0, rc = -EINVAL;
1103
1104 lock_sock(sk);
1105 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1106 goto out;
1107
1108 /* we currently don't support segmented records at the user interface */
1109 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1110 goto out;
1111
1112 rc = -EADDRNOTAVAIL;
1113 if (sock_flag(sk, SOCK_ZAPPED))
1114 goto out;
1115
1116 rc = -EPIPE;
1117 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1118 send_sig(SIGPIPE, current, 0);
1119 goto out;
1120 }
1121
1122 rc = -ENETUNREACH;
1123 if (!x25->neighbour)
1124 goto out;
1125
1126 if (usx25) {
1127 rc = -EINVAL;
1128 if (msg->msg_namelen < sizeof(sx25))
1129 goto out;
1130 memcpy(&sx25, usx25, sizeof(sx25));
1131 rc = -EISCONN;
1132 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1133 goto out;
1134 rc = -EINVAL;
1135 if (sx25.sx25_family != AF_X25)
1136 goto out;
1137 } else {
1138 /*
1139 * FIXME 1003.1g - if the socket is like this because
1140 * it has become closed (not started closed) we ought
1141 * to SIGPIPE, EPIPE;
1142 */
1143 rc = -ENOTCONN;
1144 if (sk->sk_state != TCP_ESTABLISHED)
1145 goto out;
1146
1147 sx25.sx25_family = AF_X25;
1148 sx25.sx25_addr = x25->dest_addr;
1149 }
1150
1151 /* Sanity check the packet size */
1152 if (len > 65535) {
1153 rc = -EMSGSIZE;
1154 goto out;
1155 }
1156
1157 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1158
1159 /* Build a packet */
1160 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1161
1162 if ((msg->msg_flags & MSG_OOB) && len > 32)
1163 len = 32;
1164
1165 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1166
1167 release_sock(sk);
1168 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1169 lock_sock(sk);
1170 if (!skb)
1171 goto out;
1172 X25_SKB_CB(skb)->flags = msg->msg_flags;
1173
1174 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1175
1176 /*
1177 * Put the data on the end
1178 */
1179 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1180
1181 skb_reset_transport_header(skb);
1182 skb_put(skb, len);
1183
1184 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1185 if (rc)
1186 goto out_kfree_skb;
1187
1188 /*
1189 * If the Q BIT Include socket option is in force, the first
1190 * byte of the user data is the logical value of the Q Bit.
1191 */
1192 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1193 if (!pskb_may_pull(skb, 1))
1194 goto out_kfree_skb;
1195
1196 qbit = skb->data[0];
1197 skb_pull(skb, 1);
1198 }
1199
1200 /*
1201 * Push down the X.25 header
1202 */
1203 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1204
1205 if (msg->msg_flags & MSG_OOB) {
1206 if (x25->neighbour->extended) {
1207 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1208 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1209 *asmptr++ = (x25->lci >> 0) & 0xFF;
1210 *asmptr++ = X25_INTERRUPT;
1211 } else {
1212 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1213 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1214 *asmptr++ = (x25->lci >> 0) & 0xFF;
1215 *asmptr++ = X25_INTERRUPT;
1216 }
1217 } else {
1218 if (x25->neighbour->extended) {
1219 /* Build an Extended X.25 header */
1220 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1221 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1222 *asmptr++ = (x25->lci >> 0) & 0xFF;
1223 *asmptr++ = X25_DATA;
1224 *asmptr++ = X25_DATA;
1225 } else {
1226 /* Build an Standard X.25 header */
1227 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1228 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1229 *asmptr++ = (x25->lci >> 0) & 0xFF;
1230 *asmptr++ = X25_DATA;
1231 }
1232
1233 if (qbit)
1234 skb->data[0] |= X25_Q_BIT;
1235 }
1236
1237 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1238 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1239
1240 rc = -ENOTCONN;
1241 if (sk->sk_state != TCP_ESTABLISHED)
1242 goto out_kfree_skb;
1243
1244 if (msg->msg_flags & MSG_OOB)
1245 skb_queue_tail(&x25->interrupt_out_queue, skb);
1246 else {
1247 rc = x25_output(sk, skb);
1248 len = rc;
1249 if (rc < 0)
1250 kfree_skb(skb);
1251 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1252 len++;
1253 }
1254
1255 x25_kick(sk);
1256 rc = len;
1257 out:
1258 release_sock(sk);
1259 return rc;
1260 out_kfree_skb:
1261 kfree_skb(skb);
1262 goto out;
1263 }
1264
1265
x25_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)1266 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1267 int flags)
1268 {
1269 struct sock *sk = sock->sk;
1270 struct x25_sock *x25 = x25_sk(sk);
1271 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1272 size_t copied;
1273 int qbit, header_len;
1274 struct sk_buff *skb;
1275 unsigned char *asmptr;
1276 int rc = -ENOTCONN;
1277
1278 lock_sock(sk);
1279
1280 if (x25->neighbour == NULL)
1281 goto out;
1282
1283 header_len = x25->neighbour->extended ?
1284 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1285
1286 /*
1287 * This works for seqpacket too. The receiver has ordered the queue for
1288 * us! We do one quick check first though
1289 */
1290 if (sk->sk_state != TCP_ESTABLISHED)
1291 goto out;
1292
1293 if (flags & MSG_OOB) {
1294 rc = -EINVAL;
1295 if (sock_flag(sk, SOCK_URGINLINE) ||
1296 !skb_peek(&x25->interrupt_in_queue))
1297 goto out;
1298
1299 skb = skb_dequeue(&x25->interrupt_in_queue);
1300
1301 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1302 goto out_free_dgram;
1303
1304 skb_pull(skb, X25_STD_MIN_LEN);
1305
1306 /*
1307 * No Q bit information on Interrupt data.
1308 */
1309 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1310 asmptr = skb_push(skb, 1);
1311 *asmptr = 0x00;
1312 }
1313
1314 msg->msg_flags |= MSG_OOB;
1315 } else {
1316 /* Now we can treat all alike */
1317 release_sock(sk);
1318 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1319 flags & MSG_DONTWAIT, &rc);
1320 lock_sock(sk);
1321 if (!skb)
1322 goto out;
1323
1324 if (!pskb_may_pull(skb, header_len))
1325 goto out_free_dgram;
1326
1327 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1328
1329 skb_pull(skb, header_len);
1330
1331 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1332 asmptr = skb_push(skb, 1);
1333 *asmptr = qbit;
1334 }
1335 }
1336
1337 skb_reset_transport_header(skb);
1338 copied = skb->len;
1339
1340 if (copied > size) {
1341 copied = size;
1342 msg->msg_flags |= MSG_TRUNC;
1343 }
1344
1345 /* Currently, each datagram always contains a complete record */
1346 msg->msg_flags |= MSG_EOR;
1347
1348 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1349 if (rc)
1350 goto out_free_dgram;
1351
1352 if (sx25) {
1353 sx25->sx25_family = AF_X25;
1354 sx25->sx25_addr = x25->dest_addr;
1355 msg->msg_namelen = sizeof(*sx25);
1356 }
1357
1358 x25_check_rbuf(sk);
1359 rc = copied;
1360 out_free_dgram:
1361 skb_free_datagram(sk, skb);
1362 out:
1363 release_sock(sk);
1364 return rc;
1365 }
1366
1367
x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1368 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1369 {
1370 struct sock *sk = sock->sk;
1371 struct x25_sock *x25 = x25_sk(sk);
1372 void __user *argp = (void __user *)arg;
1373 int rc;
1374
1375 switch (cmd) {
1376 case TIOCOUTQ: {
1377 int amount;
1378
1379 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1380 if (amount < 0)
1381 amount = 0;
1382 rc = put_user(amount, (unsigned int __user *)argp);
1383 break;
1384 }
1385
1386 case TIOCINQ: {
1387 struct sk_buff *skb;
1388 int amount = 0;
1389 /*
1390 * These two are safe on a single CPU system as
1391 * only user tasks fiddle here
1392 */
1393 lock_sock(sk);
1394 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1395 amount = skb->len;
1396 release_sock(sk);
1397 rc = put_user(amount, (unsigned int __user *)argp);
1398 break;
1399 }
1400
1401 case SIOCGIFADDR:
1402 case SIOCSIFADDR:
1403 case SIOCGIFDSTADDR:
1404 case SIOCSIFDSTADDR:
1405 case SIOCGIFBRDADDR:
1406 case SIOCSIFBRDADDR:
1407 case SIOCGIFNETMASK:
1408 case SIOCSIFNETMASK:
1409 case SIOCGIFMETRIC:
1410 case SIOCSIFMETRIC:
1411 rc = -EINVAL;
1412 break;
1413 case SIOCADDRT:
1414 case SIOCDELRT:
1415 rc = -EPERM;
1416 if (!capable(CAP_NET_ADMIN))
1417 break;
1418 rc = x25_route_ioctl(cmd, argp);
1419 break;
1420 case SIOCX25GSUBSCRIP:
1421 rc = x25_subscr_ioctl(cmd, argp);
1422 break;
1423 case SIOCX25SSUBSCRIP:
1424 rc = -EPERM;
1425 if (!capable(CAP_NET_ADMIN))
1426 break;
1427 rc = x25_subscr_ioctl(cmd, argp);
1428 break;
1429 case SIOCX25GFACILITIES: {
1430 lock_sock(sk);
1431 rc = copy_to_user(argp, &x25->facilities,
1432 sizeof(x25->facilities))
1433 ? -EFAULT : 0;
1434 release_sock(sk);
1435 break;
1436 }
1437
1438 case SIOCX25SFACILITIES: {
1439 struct x25_facilities facilities;
1440 rc = -EFAULT;
1441 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1442 break;
1443 rc = -EINVAL;
1444 lock_sock(sk);
1445 if (sk->sk_state != TCP_LISTEN &&
1446 sk->sk_state != TCP_CLOSE)
1447 goto out_fac_release;
1448 if (facilities.pacsize_in < X25_PS16 ||
1449 facilities.pacsize_in > X25_PS4096)
1450 goto out_fac_release;
1451 if (facilities.pacsize_out < X25_PS16 ||
1452 facilities.pacsize_out > X25_PS4096)
1453 goto out_fac_release;
1454 if (facilities.winsize_in < 1 ||
1455 facilities.winsize_in > 127)
1456 goto out_fac_release;
1457 if (facilities.throughput) {
1458 int out = facilities.throughput & 0xf0;
1459 int in = facilities.throughput & 0x0f;
1460 if (!out)
1461 facilities.throughput |=
1462 X25_DEFAULT_THROUGHPUT << 4;
1463 else if (out < 0x30 || out > 0xD0)
1464 goto out_fac_release;
1465 if (!in)
1466 facilities.throughput |=
1467 X25_DEFAULT_THROUGHPUT;
1468 else if (in < 0x03 || in > 0x0D)
1469 goto out_fac_release;
1470 }
1471 if (facilities.reverse &&
1472 (facilities.reverse & 0x81) != 0x81)
1473 goto out_fac_release;
1474 x25->facilities = facilities;
1475 rc = 0;
1476 out_fac_release:
1477 release_sock(sk);
1478 break;
1479 }
1480
1481 case SIOCX25GDTEFACILITIES: {
1482 lock_sock(sk);
1483 rc = copy_to_user(argp, &x25->dte_facilities,
1484 sizeof(x25->dte_facilities));
1485 release_sock(sk);
1486 if (rc)
1487 rc = -EFAULT;
1488 break;
1489 }
1490
1491 case SIOCX25SDTEFACILITIES: {
1492 struct x25_dte_facilities dtefacs;
1493 rc = -EFAULT;
1494 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1495 break;
1496 rc = -EINVAL;
1497 lock_sock(sk);
1498 if (sk->sk_state != TCP_LISTEN &&
1499 sk->sk_state != TCP_CLOSE)
1500 goto out_dtefac_release;
1501 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1502 goto out_dtefac_release;
1503 if (dtefacs.called_len > X25_MAX_AE_LEN)
1504 goto out_dtefac_release;
1505 x25->dte_facilities = dtefacs;
1506 rc = 0;
1507 out_dtefac_release:
1508 release_sock(sk);
1509 break;
1510 }
1511
1512 case SIOCX25GCALLUSERDATA: {
1513 lock_sock(sk);
1514 rc = copy_to_user(argp, &x25->calluserdata,
1515 sizeof(x25->calluserdata))
1516 ? -EFAULT : 0;
1517 release_sock(sk);
1518 break;
1519 }
1520
1521 case SIOCX25SCALLUSERDATA: {
1522 struct x25_calluserdata calluserdata;
1523
1524 rc = -EFAULT;
1525 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1526 break;
1527 rc = -EINVAL;
1528 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1529 break;
1530 lock_sock(sk);
1531 x25->calluserdata = calluserdata;
1532 release_sock(sk);
1533 rc = 0;
1534 break;
1535 }
1536
1537 case SIOCX25GCAUSEDIAG: {
1538 lock_sock(sk);
1539 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1540 ? -EFAULT : 0;
1541 release_sock(sk);
1542 break;
1543 }
1544
1545 case SIOCX25SCAUSEDIAG: {
1546 struct x25_causediag causediag;
1547 rc = -EFAULT;
1548 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1549 break;
1550 lock_sock(sk);
1551 x25->causediag = causediag;
1552 release_sock(sk);
1553 rc = 0;
1554 break;
1555
1556 }
1557
1558 case SIOCX25SCUDMATCHLEN: {
1559 struct x25_subaddr sub_addr;
1560 rc = -EINVAL;
1561 lock_sock(sk);
1562 if(sk->sk_state != TCP_CLOSE)
1563 goto out_cud_release;
1564 rc = -EFAULT;
1565 if (copy_from_user(&sub_addr, argp,
1566 sizeof(sub_addr)))
1567 goto out_cud_release;
1568 rc = -EINVAL;
1569 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1570 goto out_cud_release;
1571 x25->cudmatchlength = sub_addr.cudmatchlength;
1572 rc = 0;
1573 out_cud_release:
1574 release_sock(sk);
1575 break;
1576 }
1577
1578 case SIOCX25CALLACCPTAPPRV: {
1579 rc = -EINVAL;
1580 lock_sock(sk);
1581 if (sk->sk_state == TCP_CLOSE) {
1582 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1583 rc = 0;
1584 }
1585 release_sock(sk);
1586 break;
1587 }
1588
1589 case SIOCX25SENDCALLACCPT: {
1590 rc = -EINVAL;
1591 lock_sock(sk);
1592 if (sk->sk_state != TCP_ESTABLISHED)
1593 goto out_sendcallaccpt_release;
1594 /* must call accptapprv above */
1595 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1596 goto out_sendcallaccpt_release;
1597 x25_write_internal(sk, X25_CALL_ACCEPTED);
1598 x25->state = X25_STATE_3;
1599 rc = 0;
1600 out_sendcallaccpt_release:
1601 release_sock(sk);
1602 break;
1603 }
1604
1605 default:
1606 rc = -ENOIOCTLCMD;
1607 break;
1608 }
1609
1610 return rc;
1611 }
1612
1613 static const struct net_proto_family x25_family_ops = {
1614 .family = AF_X25,
1615 .create = x25_create,
1616 .owner = THIS_MODULE,
1617 };
1618
1619 #ifdef CONFIG_COMPAT
compat_x25_subscr_ioctl(unsigned int cmd,struct compat_x25_subscrip_struct __user * x25_subscr32)1620 static int compat_x25_subscr_ioctl(unsigned int cmd,
1621 struct compat_x25_subscrip_struct __user *x25_subscr32)
1622 {
1623 struct compat_x25_subscrip_struct x25_subscr;
1624 struct x25_neigh *nb;
1625 struct net_device *dev;
1626 int rc = -EINVAL;
1627
1628 rc = -EFAULT;
1629 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1630 goto out;
1631
1632 rc = -EINVAL;
1633 dev = x25_dev_get(x25_subscr.device);
1634 if (dev == NULL)
1635 goto out;
1636
1637 nb = x25_get_neigh(dev);
1638 if (nb == NULL)
1639 goto out_dev_put;
1640
1641 dev_put(dev);
1642
1643 if (cmd == SIOCX25GSUBSCRIP) {
1644 read_lock_bh(&x25_neigh_list_lock);
1645 x25_subscr.extended = nb->extended;
1646 x25_subscr.global_facil_mask = nb->global_facil_mask;
1647 read_unlock_bh(&x25_neigh_list_lock);
1648 rc = copy_to_user(x25_subscr32, &x25_subscr,
1649 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1650 } else {
1651 rc = -EINVAL;
1652 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1653 rc = 0;
1654 write_lock_bh(&x25_neigh_list_lock);
1655 nb->extended = x25_subscr.extended;
1656 nb->global_facil_mask = x25_subscr.global_facil_mask;
1657 write_unlock_bh(&x25_neigh_list_lock);
1658 }
1659 }
1660 x25_neigh_put(nb);
1661 out:
1662 return rc;
1663 out_dev_put:
1664 dev_put(dev);
1665 goto out;
1666 }
1667
compat_x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1668 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1669 unsigned long arg)
1670 {
1671 void __user *argp = compat_ptr(arg);
1672 int rc = -ENOIOCTLCMD;
1673
1674 switch(cmd) {
1675 case TIOCOUTQ:
1676 case TIOCINQ:
1677 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1678 break;
1679 case SIOCGIFADDR:
1680 case SIOCSIFADDR:
1681 case SIOCGIFDSTADDR:
1682 case SIOCSIFDSTADDR:
1683 case SIOCGIFBRDADDR:
1684 case SIOCSIFBRDADDR:
1685 case SIOCGIFNETMASK:
1686 case SIOCSIFNETMASK:
1687 case SIOCGIFMETRIC:
1688 case SIOCSIFMETRIC:
1689 rc = -EINVAL;
1690 break;
1691 case SIOCADDRT:
1692 case SIOCDELRT:
1693 rc = -EPERM;
1694 if (!capable(CAP_NET_ADMIN))
1695 break;
1696 rc = x25_route_ioctl(cmd, argp);
1697 break;
1698 case SIOCX25GSUBSCRIP:
1699 rc = compat_x25_subscr_ioctl(cmd, argp);
1700 break;
1701 case SIOCX25SSUBSCRIP:
1702 rc = -EPERM;
1703 if (!capable(CAP_NET_ADMIN))
1704 break;
1705 rc = compat_x25_subscr_ioctl(cmd, argp);
1706 break;
1707 case SIOCX25GFACILITIES:
1708 case SIOCX25SFACILITIES:
1709 case SIOCX25GDTEFACILITIES:
1710 case SIOCX25SDTEFACILITIES:
1711 case SIOCX25GCALLUSERDATA:
1712 case SIOCX25SCALLUSERDATA:
1713 case SIOCX25GCAUSEDIAG:
1714 case SIOCX25SCAUSEDIAG:
1715 case SIOCX25SCUDMATCHLEN:
1716 case SIOCX25CALLACCPTAPPRV:
1717 case SIOCX25SENDCALLACCPT:
1718 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1719 break;
1720 default:
1721 rc = -ENOIOCTLCMD;
1722 break;
1723 }
1724 return rc;
1725 }
1726 #endif
1727
1728 static const struct proto_ops x25_proto_ops = {
1729 .family = AF_X25,
1730 .owner = THIS_MODULE,
1731 .release = x25_release,
1732 .bind = x25_bind,
1733 .connect = x25_connect,
1734 .socketpair = sock_no_socketpair,
1735 .accept = x25_accept,
1736 .getname = x25_getname,
1737 .poll = datagram_poll,
1738 .ioctl = x25_ioctl,
1739 #ifdef CONFIG_COMPAT
1740 .compat_ioctl = compat_x25_ioctl,
1741 #endif
1742 .gettstamp = sock_gettstamp,
1743 .listen = x25_listen,
1744 .shutdown = sock_no_shutdown,
1745 .setsockopt = x25_setsockopt,
1746 .getsockopt = x25_getsockopt,
1747 .sendmsg = x25_sendmsg,
1748 .recvmsg = x25_recvmsg,
1749 .mmap = sock_no_mmap,
1750 .sendpage = sock_no_sendpage,
1751 };
1752
1753 static struct packet_type x25_packet_type __read_mostly = {
1754 .type = cpu_to_be16(ETH_P_X25),
1755 .func = x25_lapb_receive_frame,
1756 };
1757
1758 static struct notifier_block x25_dev_notifier = {
1759 .notifier_call = x25_device_event,
1760 };
1761
x25_kill_by_neigh(struct x25_neigh * nb)1762 void x25_kill_by_neigh(struct x25_neigh *nb)
1763 {
1764 struct sock *s;
1765
1766 write_lock_bh(&x25_list_lock);
1767
1768 sk_for_each(s, &x25_list)
1769 if (x25_sk(s)->neighbour == nb)
1770 x25_disconnect(s, ENETUNREACH, 0, 0);
1771
1772 write_unlock_bh(&x25_list_lock);
1773
1774 /* Remove any related forwards */
1775 x25_clear_forward_by_dev(nb->dev);
1776 }
1777
x25_init(void)1778 static int __init x25_init(void)
1779 {
1780 int rc;
1781
1782 rc = proto_register(&x25_proto, 0);
1783 if (rc)
1784 goto out;
1785
1786 rc = sock_register(&x25_family_ops);
1787 if (rc)
1788 goto out_proto;
1789
1790 dev_add_pack(&x25_packet_type);
1791
1792 rc = register_netdevice_notifier(&x25_dev_notifier);
1793 if (rc)
1794 goto out_sock;
1795
1796 rc = x25_register_sysctl();
1797 if (rc)
1798 goto out_dev;
1799
1800 rc = x25_proc_init();
1801 if (rc)
1802 goto out_sysctl;
1803
1804 pr_info("Linux Version 0.2\n");
1805
1806 out:
1807 return rc;
1808 out_sysctl:
1809 x25_unregister_sysctl();
1810 out_dev:
1811 unregister_netdevice_notifier(&x25_dev_notifier);
1812 out_sock:
1813 dev_remove_pack(&x25_packet_type);
1814 sock_unregister(AF_X25);
1815 out_proto:
1816 proto_unregister(&x25_proto);
1817 goto out;
1818 }
1819 module_init(x25_init);
1820
x25_exit(void)1821 static void __exit x25_exit(void)
1822 {
1823 x25_proc_exit();
1824 x25_link_free();
1825 x25_route_free();
1826
1827 x25_unregister_sysctl();
1828
1829 unregister_netdevice_notifier(&x25_dev_notifier);
1830
1831 dev_remove_pack(&x25_packet_type);
1832
1833 sock_unregister(AF_X25);
1834 proto_unregister(&x25_proto);
1835 }
1836 module_exit(x25_exit);
1837
1838 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1839 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1840 MODULE_LICENSE("GPL");
1841 MODULE_ALIAS_NETPROTO(PF_X25);
1842