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,char __user * optval,unsigned int optlen)433 static int x25_setsockopt(struct socket *sock, int level, int optname,
434 char __user *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 (get_user(opt, (int __user *)optval))
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 rc = -EINVAL;
474 if (len < 0)
475 goto out;
476
477 len = min_t(unsigned int, len, sizeof(int));
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
670 sock_orphan(sk);
671 out:
672 release_sock(sk);
673 sock_put(sk);
674 return 0;
675 }
676
x25_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)677 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
678 {
679 struct sock *sk = sock->sk;
680 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
681 int len, i, rc = 0;
682
683 if (addr_len != sizeof(struct sockaddr_x25) ||
684 addr->sx25_family != AF_X25 ||
685 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
686 rc = -EINVAL;
687 goto out;
688 }
689
690 /* check for the null_x25_address */
691 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
692
693 len = strlen(addr->sx25_addr.x25_addr);
694 for (i = 0; i < len; i++) {
695 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
696 rc = -EINVAL;
697 goto out;
698 }
699 }
700 }
701
702 lock_sock(sk);
703 if (sock_flag(sk, SOCK_ZAPPED)) {
704 x25_sk(sk)->source_addr = addr->sx25_addr;
705 x25_insert_socket(sk);
706 sock_reset_flag(sk, SOCK_ZAPPED);
707 } else {
708 rc = -EINVAL;
709 }
710 release_sock(sk);
711 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
712 out:
713 return rc;
714 }
715
x25_wait_for_connection_establishment(struct sock * sk)716 static int x25_wait_for_connection_establishment(struct sock *sk)
717 {
718 DECLARE_WAITQUEUE(wait, current);
719 int rc;
720
721 add_wait_queue_exclusive(sk_sleep(sk), &wait);
722 for (;;) {
723 __set_current_state(TASK_INTERRUPTIBLE);
724 rc = -ERESTARTSYS;
725 if (signal_pending(current))
726 break;
727 rc = sock_error(sk);
728 if (rc) {
729 sk->sk_socket->state = SS_UNCONNECTED;
730 break;
731 }
732 rc = 0;
733 if (sk->sk_state != TCP_ESTABLISHED) {
734 release_sock(sk);
735 schedule();
736 lock_sock(sk);
737 } else
738 break;
739 }
740 __set_current_state(TASK_RUNNING);
741 remove_wait_queue(sk_sleep(sk), &wait);
742 return rc;
743 }
744
x25_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)745 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
746 int addr_len, int flags)
747 {
748 struct sock *sk = sock->sk;
749 struct x25_sock *x25 = x25_sk(sk);
750 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
751 struct x25_route *rt;
752 int rc = 0;
753
754 lock_sock(sk);
755 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
756 sock->state = SS_CONNECTED;
757 goto out; /* Connect completed during a ERESTARTSYS event */
758 }
759
760 rc = -ECONNREFUSED;
761 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
762 sock->state = SS_UNCONNECTED;
763 goto out;
764 }
765
766 rc = -EISCONN; /* No reconnect on a seqpacket socket */
767 if (sk->sk_state == TCP_ESTABLISHED)
768 goto out;
769
770 rc = -EALREADY; /* Do nothing if call is already in progress */
771 if (sk->sk_state == TCP_SYN_SENT)
772 goto out;
773
774 sk->sk_state = TCP_CLOSE;
775 sock->state = SS_UNCONNECTED;
776
777 rc = -EINVAL;
778 if (addr_len != sizeof(struct sockaddr_x25) ||
779 addr->sx25_family != AF_X25 ||
780 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
781 goto out;
782
783 rc = -ENETUNREACH;
784 rt = x25_get_route(&addr->sx25_addr);
785 if (!rt)
786 goto out;
787
788 x25->neighbour = x25_get_neigh(rt->dev);
789 if (!x25->neighbour)
790 goto out_put_route;
791
792 x25_limit_facilities(&x25->facilities, x25->neighbour);
793
794 x25->lci = x25_new_lci(x25->neighbour);
795 if (!x25->lci)
796 goto out_put_neigh;
797
798 rc = -EINVAL;
799 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
800 goto out_put_neigh;
801
802 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
803 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
804
805 x25->dest_addr = addr->sx25_addr;
806
807 /* Move to connecting socket, start sending Connect Requests */
808 sock->state = SS_CONNECTING;
809 sk->sk_state = TCP_SYN_SENT;
810
811 x25->state = X25_STATE_1;
812
813 x25_write_internal(sk, X25_CALL_REQUEST);
814
815 x25_start_heartbeat(sk);
816 x25_start_t21timer(sk);
817
818 /* Now the loop */
819 rc = -EINPROGRESS;
820 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
821 goto out;
822
823 rc = x25_wait_for_connection_establishment(sk);
824 if (rc)
825 goto out_put_neigh;
826
827 sock->state = SS_CONNECTED;
828 rc = 0;
829 out_put_neigh:
830 if (rc && x25->neighbour) {
831 read_lock_bh(&x25_list_lock);
832 x25_neigh_put(x25->neighbour);
833 x25->neighbour = NULL;
834 read_unlock_bh(&x25_list_lock);
835 x25->state = X25_STATE_0;
836 }
837 out_put_route:
838 x25_route_put(rt);
839 out:
840 release_sock(sk);
841 return rc;
842 }
843
x25_wait_for_data(struct sock * sk,long timeout)844 static int x25_wait_for_data(struct sock *sk, long timeout)
845 {
846 DECLARE_WAITQUEUE(wait, current);
847 int rc = 0;
848
849 add_wait_queue_exclusive(sk_sleep(sk), &wait);
850 for (;;) {
851 __set_current_state(TASK_INTERRUPTIBLE);
852 if (sk->sk_shutdown & RCV_SHUTDOWN)
853 break;
854 rc = -ERESTARTSYS;
855 if (signal_pending(current))
856 break;
857 rc = -EAGAIN;
858 if (!timeout)
859 break;
860 rc = 0;
861 if (skb_queue_empty(&sk->sk_receive_queue)) {
862 release_sock(sk);
863 timeout = schedule_timeout(timeout);
864 lock_sock(sk);
865 } else
866 break;
867 }
868 __set_current_state(TASK_RUNNING);
869 remove_wait_queue(sk_sleep(sk), &wait);
870 return rc;
871 }
872
x25_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)873 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
874 bool kern)
875 {
876 struct sock *sk = sock->sk;
877 struct sock *newsk;
878 struct sk_buff *skb;
879 int rc = -EINVAL;
880
881 if (!sk)
882 goto out;
883
884 rc = -EOPNOTSUPP;
885 if (sk->sk_type != SOCK_SEQPACKET)
886 goto out;
887
888 lock_sock(sk);
889 rc = -EINVAL;
890 if (sk->sk_state != TCP_LISTEN)
891 goto out2;
892
893 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
894 if (rc)
895 goto out2;
896 skb = skb_dequeue(&sk->sk_receive_queue);
897 rc = -EINVAL;
898 if (!skb->sk)
899 goto out2;
900 newsk = skb->sk;
901 sock_graft(newsk, newsock);
902
903 /* Now attach up the new socket */
904 skb->sk = NULL;
905 kfree_skb(skb);
906 sk->sk_ack_backlog--;
907 newsock->state = SS_CONNECTED;
908 rc = 0;
909 out2:
910 release_sock(sk);
911 out:
912 return rc;
913 }
914
x25_getname(struct socket * sock,struct sockaddr * uaddr,int peer)915 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
916 int peer)
917 {
918 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
919 struct sock *sk = sock->sk;
920 struct x25_sock *x25 = x25_sk(sk);
921 int rc = 0;
922
923 if (peer) {
924 if (sk->sk_state != TCP_ESTABLISHED) {
925 rc = -ENOTCONN;
926 goto out;
927 }
928 sx25->sx25_addr = x25->dest_addr;
929 } else
930 sx25->sx25_addr = x25->source_addr;
931
932 sx25->sx25_family = AF_X25;
933 rc = sizeof(*sx25);
934
935 out:
936 return rc;
937 }
938
x25_rx_call_request(struct sk_buff * skb,struct x25_neigh * nb,unsigned int lci)939 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
940 unsigned int lci)
941 {
942 struct sock *sk;
943 struct sock *make;
944 struct x25_sock *makex25;
945 struct x25_address source_addr, dest_addr;
946 struct x25_facilities facilities;
947 struct x25_dte_facilities dte_facilities;
948 int len, addr_len, rc;
949
950 /*
951 * Remove the LCI and frame type.
952 */
953 skb_pull(skb, X25_STD_MIN_LEN);
954
955 /*
956 * Extract the X.25 addresses and convert them to ASCII strings,
957 * and remove them.
958 *
959 * Address block is mandatory in call request packets
960 */
961 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
962 if (addr_len <= 0)
963 goto out_clear_request;
964 skb_pull(skb, addr_len);
965
966 /*
967 * Get the length of the facilities, skip past them for the moment
968 * get the call user data because this is needed to determine
969 * the correct listener
970 *
971 * Facilities length is mandatory in call request packets
972 */
973 if (!pskb_may_pull(skb, 1))
974 goto out_clear_request;
975 len = skb->data[0] + 1;
976 if (!pskb_may_pull(skb, len))
977 goto out_clear_request;
978 skb_pull(skb,len);
979
980 /*
981 * Ensure that the amount of call user data is valid.
982 */
983 if (skb->len > X25_MAX_CUD_LEN)
984 goto out_clear_request;
985
986 /*
987 * Get all the call user data so it can be used in
988 * x25_find_listener and skb_copy_from_linear_data up ahead.
989 */
990 if (!pskb_may_pull(skb, skb->len))
991 goto out_clear_request;
992
993 /*
994 * Find a listener for the particular address/cud pair.
995 */
996 sk = x25_find_listener(&source_addr,skb);
997 skb_push(skb,len);
998
999 if (sk != NULL && sk_acceptq_is_full(sk)) {
1000 goto out_sock_put;
1001 }
1002
1003 /*
1004 * We dont have any listeners for this incoming call.
1005 * Try forwarding it.
1006 */
1007 if (sk == NULL) {
1008 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1009 if (sysctl_x25_forward &&
1010 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1011 {
1012 /* Call was forwarded, dont process it any more */
1013 kfree_skb(skb);
1014 rc = 1;
1015 goto out;
1016 } else {
1017 /* No listeners, can't forward, clear the call */
1018 goto out_clear_request;
1019 }
1020 }
1021
1022 /*
1023 * Try to reach a compromise on the requested facilities.
1024 */
1025 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1026 if (len == -1)
1027 goto out_sock_put;
1028
1029 /*
1030 * current neighbour/link might impose additional limits
1031 * on certain facilties
1032 */
1033
1034 x25_limit_facilities(&facilities, nb);
1035
1036 /*
1037 * Try to create a new socket.
1038 */
1039 make = x25_make_new(sk);
1040 if (!make)
1041 goto out_sock_put;
1042
1043 /*
1044 * Remove the facilities
1045 */
1046 skb_pull(skb, len);
1047
1048 skb->sk = make;
1049 make->sk_state = TCP_ESTABLISHED;
1050
1051 makex25 = x25_sk(make);
1052 makex25->lci = lci;
1053 makex25->dest_addr = dest_addr;
1054 makex25->source_addr = source_addr;
1055 x25_neigh_hold(nb);
1056 makex25->neighbour = nb;
1057 makex25->facilities = facilities;
1058 makex25->dte_facilities= dte_facilities;
1059 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1060 /* ensure no reverse facil on accept */
1061 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1062 /* ensure no calling address extension on accept */
1063 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1064 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1065
1066 /* Normally all calls are accepted immediately */
1067 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1068 x25_write_internal(make, X25_CALL_ACCEPTED);
1069 makex25->state = X25_STATE_3;
1070 }
1071
1072 /*
1073 * Incoming Call User Data.
1074 */
1075 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1076 makex25->calluserdata.cudlength = skb->len;
1077
1078 sk->sk_ack_backlog++;
1079
1080 x25_insert_socket(make);
1081
1082 skb_queue_head(&sk->sk_receive_queue, skb);
1083
1084 x25_start_heartbeat(make);
1085
1086 if (!sock_flag(sk, SOCK_DEAD))
1087 sk->sk_data_ready(sk);
1088 rc = 1;
1089 sock_put(sk);
1090 out:
1091 return rc;
1092 out_sock_put:
1093 sock_put(sk);
1094 out_clear_request:
1095 rc = 0;
1096 x25_transmit_clear_request(nb, lci, 0x01);
1097 goto out;
1098 }
1099
x25_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)1100 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1101 {
1102 struct sock *sk = sock->sk;
1103 struct x25_sock *x25 = x25_sk(sk);
1104 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1105 struct sockaddr_x25 sx25;
1106 struct sk_buff *skb;
1107 unsigned char *asmptr;
1108 int noblock = msg->msg_flags & MSG_DONTWAIT;
1109 size_t size;
1110 int qbit = 0, rc = -EINVAL;
1111
1112 lock_sock(sk);
1113 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1114 goto out;
1115
1116 /* we currently don't support segmented records at the user interface */
1117 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1118 goto out;
1119
1120 rc = -EADDRNOTAVAIL;
1121 if (sock_flag(sk, SOCK_ZAPPED))
1122 goto out;
1123
1124 rc = -EPIPE;
1125 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1126 send_sig(SIGPIPE, current, 0);
1127 goto out;
1128 }
1129
1130 rc = -ENETUNREACH;
1131 if (!x25->neighbour)
1132 goto out;
1133
1134 if (usx25) {
1135 rc = -EINVAL;
1136 if (msg->msg_namelen < sizeof(sx25))
1137 goto out;
1138 memcpy(&sx25, usx25, sizeof(sx25));
1139 rc = -EISCONN;
1140 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1141 goto out;
1142 rc = -EINVAL;
1143 if (sx25.sx25_family != AF_X25)
1144 goto out;
1145 } else {
1146 /*
1147 * FIXME 1003.1g - if the socket is like this because
1148 * it has become closed (not started closed) we ought
1149 * to SIGPIPE, EPIPE;
1150 */
1151 rc = -ENOTCONN;
1152 if (sk->sk_state != TCP_ESTABLISHED)
1153 goto out;
1154
1155 sx25.sx25_family = AF_X25;
1156 sx25.sx25_addr = x25->dest_addr;
1157 }
1158
1159 /* Sanity check the packet size */
1160 if (len > 65535) {
1161 rc = -EMSGSIZE;
1162 goto out;
1163 }
1164
1165 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1166
1167 /* Build a packet */
1168 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1169
1170 if ((msg->msg_flags & MSG_OOB) && len > 32)
1171 len = 32;
1172
1173 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1174
1175 release_sock(sk);
1176 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1177 lock_sock(sk);
1178 if (!skb)
1179 goto out;
1180 X25_SKB_CB(skb)->flags = msg->msg_flags;
1181
1182 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1183
1184 /*
1185 * Put the data on the end
1186 */
1187 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1188
1189 skb_reset_transport_header(skb);
1190 skb_put(skb, len);
1191
1192 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1193 if (rc)
1194 goto out_kfree_skb;
1195
1196 /*
1197 * If the Q BIT Include socket option is in force, the first
1198 * byte of the user data is the logical value of the Q Bit.
1199 */
1200 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1201 if (!pskb_may_pull(skb, 1))
1202 goto out_kfree_skb;
1203
1204 qbit = skb->data[0];
1205 skb_pull(skb, 1);
1206 }
1207
1208 /*
1209 * Push down the X.25 header
1210 */
1211 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1212
1213 if (msg->msg_flags & MSG_OOB) {
1214 if (x25->neighbour->extended) {
1215 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1216 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1217 *asmptr++ = (x25->lci >> 0) & 0xFF;
1218 *asmptr++ = X25_INTERRUPT;
1219 } else {
1220 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1221 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1222 *asmptr++ = (x25->lci >> 0) & 0xFF;
1223 *asmptr++ = X25_INTERRUPT;
1224 }
1225 } else {
1226 if (x25->neighbour->extended) {
1227 /* Build an Extended X.25 header */
1228 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1229 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1230 *asmptr++ = (x25->lci >> 0) & 0xFF;
1231 *asmptr++ = X25_DATA;
1232 *asmptr++ = X25_DATA;
1233 } else {
1234 /* Build an Standard X.25 header */
1235 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1236 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1237 *asmptr++ = (x25->lci >> 0) & 0xFF;
1238 *asmptr++ = X25_DATA;
1239 }
1240
1241 if (qbit)
1242 skb->data[0] |= X25_Q_BIT;
1243 }
1244
1245 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1246 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1247
1248 rc = -ENOTCONN;
1249 if (sk->sk_state != TCP_ESTABLISHED)
1250 goto out_kfree_skb;
1251
1252 if (msg->msg_flags & MSG_OOB)
1253 skb_queue_tail(&x25->interrupt_out_queue, skb);
1254 else {
1255 rc = x25_output(sk, skb);
1256 len = rc;
1257 if (rc < 0)
1258 kfree_skb(skb);
1259 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1260 len++;
1261 }
1262
1263 x25_kick(sk);
1264 rc = len;
1265 out:
1266 release_sock(sk);
1267 return rc;
1268 out_kfree_skb:
1269 kfree_skb(skb);
1270 goto out;
1271 }
1272
1273
x25_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)1274 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1275 int flags)
1276 {
1277 struct sock *sk = sock->sk;
1278 struct x25_sock *x25 = x25_sk(sk);
1279 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1280 size_t copied;
1281 int qbit, header_len;
1282 struct sk_buff *skb;
1283 unsigned char *asmptr;
1284 int rc = -ENOTCONN;
1285
1286 lock_sock(sk);
1287
1288 if (x25->neighbour == NULL)
1289 goto out;
1290
1291 header_len = x25->neighbour->extended ?
1292 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1293
1294 /*
1295 * This works for seqpacket too. The receiver has ordered the queue for
1296 * us! We do one quick check first though
1297 */
1298 if (sk->sk_state != TCP_ESTABLISHED)
1299 goto out;
1300
1301 if (flags & MSG_OOB) {
1302 rc = -EINVAL;
1303 if (sock_flag(sk, SOCK_URGINLINE) ||
1304 !skb_peek(&x25->interrupt_in_queue))
1305 goto out;
1306
1307 skb = skb_dequeue(&x25->interrupt_in_queue);
1308
1309 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1310 goto out_free_dgram;
1311
1312 skb_pull(skb, X25_STD_MIN_LEN);
1313
1314 /*
1315 * No Q bit information on Interrupt data.
1316 */
1317 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1318 asmptr = skb_push(skb, 1);
1319 *asmptr = 0x00;
1320 }
1321
1322 msg->msg_flags |= MSG_OOB;
1323 } else {
1324 /* Now we can treat all alike */
1325 release_sock(sk);
1326 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1327 flags & MSG_DONTWAIT, &rc);
1328 lock_sock(sk);
1329 if (!skb)
1330 goto out;
1331
1332 if (!pskb_may_pull(skb, header_len))
1333 goto out_free_dgram;
1334
1335 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1336
1337 skb_pull(skb, header_len);
1338
1339 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1340 asmptr = skb_push(skb, 1);
1341 *asmptr = qbit;
1342 }
1343 }
1344
1345 skb_reset_transport_header(skb);
1346 copied = skb->len;
1347
1348 if (copied > size) {
1349 copied = size;
1350 msg->msg_flags |= MSG_TRUNC;
1351 }
1352
1353 /* Currently, each datagram always contains a complete record */
1354 msg->msg_flags |= MSG_EOR;
1355
1356 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1357 if (rc)
1358 goto out_free_dgram;
1359
1360 if (sx25) {
1361 sx25->sx25_family = AF_X25;
1362 sx25->sx25_addr = x25->dest_addr;
1363 msg->msg_namelen = sizeof(*sx25);
1364 }
1365
1366 x25_check_rbuf(sk);
1367 rc = copied;
1368 out_free_dgram:
1369 skb_free_datagram(sk, skb);
1370 out:
1371 release_sock(sk);
1372 return rc;
1373 }
1374
1375
x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1376 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1377 {
1378 struct sock *sk = sock->sk;
1379 struct x25_sock *x25 = x25_sk(sk);
1380 void __user *argp = (void __user *)arg;
1381 int rc;
1382
1383 switch (cmd) {
1384 case TIOCOUTQ: {
1385 int amount;
1386
1387 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1388 if (amount < 0)
1389 amount = 0;
1390 rc = put_user(amount, (unsigned int __user *)argp);
1391 break;
1392 }
1393
1394 case TIOCINQ: {
1395 struct sk_buff *skb;
1396 int amount = 0;
1397 /*
1398 * These two are safe on a single CPU system as
1399 * only user tasks fiddle here
1400 */
1401 lock_sock(sk);
1402 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1403 amount = skb->len;
1404 release_sock(sk);
1405 rc = put_user(amount, (unsigned int __user *)argp);
1406 break;
1407 }
1408
1409 case SIOCGIFADDR:
1410 case SIOCSIFADDR:
1411 case SIOCGIFDSTADDR:
1412 case SIOCSIFDSTADDR:
1413 case SIOCGIFBRDADDR:
1414 case SIOCSIFBRDADDR:
1415 case SIOCGIFNETMASK:
1416 case SIOCSIFNETMASK:
1417 case SIOCGIFMETRIC:
1418 case SIOCSIFMETRIC:
1419 rc = -EINVAL;
1420 break;
1421 case SIOCADDRT:
1422 case SIOCDELRT:
1423 rc = -EPERM;
1424 if (!capable(CAP_NET_ADMIN))
1425 break;
1426 rc = x25_route_ioctl(cmd, argp);
1427 break;
1428 case SIOCX25GSUBSCRIP:
1429 rc = x25_subscr_ioctl(cmd, argp);
1430 break;
1431 case SIOCX25SSUBSCRIP:
1432 rc = -EPERM;
1433 if (!capable(CAP_NET_ADMIN))
1434 break;
1435 rc = x25_subscr_ioctl(cmd, argp);
1436 break;
1437 case SIOCX25GFACILITIES: {
1438 lock_sock(sk);
1439 rc = copy_to_user(argp, &x25->facilities,
1440 sizeof(x25->facilities))
1441 ? -EFAULT : 0;
1442 release_sock(sk);
1443 break;
1444 }
1445
1446 case SIOCX25SFACILITIES: {
1447 struct x25_facilities facilities;
1448 rc = -EFAULT;
1449 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1450 break;
1451 rc = -EINVAL;
1452 lock_sock(sk);
1453 if (sk->sk_state != TCP_LISTEN &&
1454 sk->sk_state != TCP_CLOSE)
1455 goto out_fac_release;
1456 if (facilities.pacsize_in < X25_PS16 ||
1457 facilities.pacsize_in > X25_PS4096)
1458 goto out_fac_release;
1459 if (facilities.pacsize_out < X25_PS16 ||
1460 facilities.pacsize_out > X25_PS4096)
1461 goto out_fac_release;
1462 if (facilities.winsize_in < 1 ||
1463 facilities.winsize_in > 127)
1464 goto out_fac_release;
1465 if (facilities.throughput) {
1466 int out = facilities.throughput & 0xf0;
1467 int in = facilities.throughput & 0x0f;
1468 if (!out)
1469 facilities.throughput |=
1470 X25_DEFAULT_THROUGHPUT << 4;
1471 else if (out < 0x30 || out > 0xD0)
1472 goto out_fac_release;
1473 if (!in)
1474 facilities.throughput |=
1475 X25_DEFAULT_THROUGHPUT;
1476 else if (in < 0x03 || in > 0x0D)
1477 goto out_fac_release;
1478 }
1479 if (facilities.reverse &&
1480 (facilities.reverse & 0x81) != 0x81)
1481 goto out_fac_release;
1482 x25->facilities = facilities;
1483 rc = 0;
1484 out_fac_release:
1485 release_sock(sk);
1486 break;
1487 }
1488
1489 case SIOCX25GDTEFACILITIES: {
1490 lock_sock(sk);
1491 rc = copy_to_user(argp, &x25->dte_facilities,
1492 sizeof(x25->dte_facilities));
1493 release_sock(sk);
1494 if (rc)
1495 rc = -EFAULT;
1496 break;
1497 }
1498
1499 case SIOCX25SDTEFACILITIES: {
1500 struct x25_dte_facilities dtefacs;
1501 rc = -EFAULT;
1502 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1503 break;
1504 rc = -EINVAL;
1505 lock_sock(sk);
1506 if (sk->sk_state != TCP_LISTEN &&
1507 sk->sk_state != TCP_CLOSE)
1508 goto out_dtefac_release;
1509 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1510 goto out_dtefac_release;
1511 if (dtefacs.called_len > X25_MAX_AE_LEN)
1512 goto out_dtefac_release;
1513 x25->dte_facilities = dtefacs;
1514 rc = 0;
1515 out_dtefac_release:
1516 release_sock(sk);
1517 break;
1518 }
1519
1520 case SIOCX25GCALLUSERDATA: {
1521 lock_sock(sk);
1522 rc = copy_to_user(argp, &x25->calluserdata,
1523 sizeof(x25->calluserdata))
1524 ? -EFAULT : 0;
1525 release_sock(sk);
1526 break;
1527 }
1528
1529 case SIOCX25SCALLUSERDATA: {
1530 struct x25_calluserdata calluserdata;
1531
1532 rc = -EFAULT;
1533 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1534 break;
1535 rc = -EINVAL;
1536 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1537 break;
1538 lock_sock(sk);
1539 x25->calluserdata = calluserdata;
1540 release_sock(sk);
1541 rc = 0;
1542 break;
1543 }
1544
1545 case SIOCX25GCAUSEDIAG: {
1546 lock_sock(sk);
1547 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1548 ? -EFAULT : 0;
1549 release_sock(sk);
1550 break;
1551 }
1552
1553 case SIOCX25SCAUSEDIAG: {
1554 struct x25_causediag causediag;
1555 rc = -EFAULT;
1556 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1557 break;
1558 lock_sock(sk);
1559 x25->causediag = causediag;
1560 release_sock(sk);
1561 rc = 0;
1562 break;
1563
1564 }
1565
1566 case SIOCX25SCUDMATCHLEN: {
1567 struct x25_subaddr sub_addr;
1568 rc = -EINVAL;
1569 lock_sock(sk);
1570 if(sk->sk_state != TCP_CLOSE)
1571 goto out_cud_release;
1572 rc = -EFAULT;
1573 if (copy_from_user(&sub_addr, argp,
1574 sizeof(sub_addr)))
1575 goto out_cud_release;
1576 rc = -EINVAL;
1577 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1578 goto out_cud_release;
1579 x25->cudmatchlength = sub_addr.cudmatchlength;
1580 rc = 0;
1581 out_cud_release:
1582 release_sock(sk);
1583 break;
1584 }
1585
1586 case SIOCX25CALLACCPTAPPRV: {
1587 rc = -EINVAL;
1588 lock_sock(sk);
1589 if (sk->sk_state == TCP_CLOSE) {
1590 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1591 rc = 0;
1592 }
1593 release_sock(sk);
1594 break;
1595 }
1596
1597 case SIOCX25SENDCALLACCPT: {
1598 rc = -EINVAL;
1599 lock_sock(sk);
1600 if (sk->sk_state != TCP_ESTABLISHED)
1601 goto out_sendcallaccpt_release;
1602 /* must call accptapprv above */
1603 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1604 goto out_sendcallaccpt_release;
1605 x25_write_internal(sk, X25_CALL_ACCEPTED);
1606 x25->state = X25_STATE_3;
1607 rc = 0;
1608 out_sendcallaccpt_release:
1609 release_sock(sk);
1610 break;
1611 }
1612
1613 default:
1614 rc = -ENOIOCTLCMD;
1615 break;
1616 }
1617
1618 return rc;
1619 }
1620
1621 static const struct net_proto_family x25_family_ops = {
1622 .family = AF_X25,
1623 .create = x25_create,
1624 .owner = THIS_MODULE,
1625 };
1626
1627 #ifdef CONFIG_COMPAT
compat_x25_subscr_ioctl(unsigned int cmd,struct compat_x25_subscrip_struct __user * x25_subscr32)1628 static int compat_x25_subscr_ioctl(unsigned int cmd,
1629 struct compat_x25_subscrip_struct __user *x25_subscr32)
1630 {
1631 struct compat_x25_subscrip_struct x25_subscr;
1632 struct x25_neigh *nb;
1633 struct net_device *dev;
1634 int rc = -EINVAL;
1635
1636 rc = -EFAULT;
1637 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1638 goto out;
1639
1640 rc = -EINVAL;
1641 dev = x25_dev_get(x25_subscr.device);
1642 if (dev == NULL)
1643 goto out;
1644
1645 nb = x25_get_neigh(dev);
1646 if (nb == NULL)
1647 goto out_dev_put;
1648
1649 dev_put(dev);
1650
1651 if (cmd == SIOCX25GSUBSCRIP) {
1652 read_lock_bh(&x25_neigh_list_lock);
1653 x25_subscr.extended = nb->extended;
1654 x25_subscr.global_facil_mask = nb->global_facil_mask;
1655 read_unlock_bh(&x25_neigh_list_lock);
1656 rc = copy_to_user(x25_subscr32, &x25_subscr,
1657 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1658 } else {
1659 rc = -EINVAL;
1660 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1661 rc = 0;
1662 write_lock_bh(&x25_neigh_list_lock);
1663 nb->extended = x25_subscr.extended;
1664 nb->global_facil_mask = x25_subscr.global_facil_mask;
1665 write_unlock_bh(&x25_neigh_list_lock);
1666 }
1667 }
1668 x25_neigh_put(nb);
1669 out:
1670 return rc;
1671 out_dev_put:
1672 dev_put(dev);
1673 goto out;
1674 }
1675
compat_x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1676 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1677 unsigned long arg)
1678 {
1679 void __user *argp = compat_ptr(arg);
1680 int rc = -ENOIOCTLCMD;
1681
1682 switch(cmd) {
1683 case TIOCOUTQ:
1684 case TIOCINQ:
1685 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1686 break;
1687 case SIOCGIFADDR:
1688 case SIOCSIFADDR:
1689 case SIOCGIFDSTADDR:
1690 case SIOCSIFDSTADDR:
1691 case SIOCGIFBRDADDR:
1692 case SIOCSIFBRDADDR:
1693 case SIOCGIFNETMASK:
1694 case SIOCSIFNETMASK:
1695 case SIOCGIFMETRIC:
1696 case SIOCSIFMETRIC:
1697 rc = -EINVAL;
1698 break;
1699 case SIOCADDRT:
1700 case SIOCDELRT:
1701 rc = -EPERM;
1702 if (!capable(CAP_NET_ADMIN))
1703 break;
1704 rc = x25_route_ioctl(cmd, argp);
1705 break;
1706 case SIOCX25GSUBSCRIP:
1707 rc = compat_x25_subscr_ioctl(cmd, argp);
1708 break;
1709 case SIOCX25SSUBSCRIP:
1710 rc = -EPERM;
1711 if (!capable(CAP_NET_ADMIN))
1712 break;
1713 rc = compat_x25_subscr_ioctl(cmd, argp);
1714 break;
1715 case SIOCX25GFACILITIES:
1716 case SIOCX25SFACILITIES:
1717 case SIOCX25GDTEFACILITIES:
1718 case SIOCX25SDTEFACILITIES:
1719 case SIOCX25GCALLUSERDATA:
1720 case SIOCX25SCALLUSERDATA:
1721 case SIOCX25GCAUSEDIAG:
1722 case SIOCX25SCAUSEDIAG:
1723 case SIOCX25SCUDMATCHLEN:
1724 case SIOCX25CALLACCPTAPPRV:
1725 case SIOCX25SENDCALLACCPT:
1726 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1727 break;
1728 default:
1729 rc = -ENOIOCTLCMD;
1730 break;
1731 }
1732 return rc;
1733 }
1734 #endif
1735
1736 static const struct proto_ops x25_proto_ops = {
1737 .family = AF_X25,
1738 .owner = THIS_MODULE,
1739 .release = x25_release,
1740 .bind = x25_bind,
1741 .connect = x25_connect,
1742 .socketpair = sock_no_socketpair,
1743 .accept = x25_accept,
1744 .getname = x25_getname,
1745 .poll = datagram_poll,
1746 .ioctl = x25_ioctl,
1747 #ifdef CONFIG_COMPAT
1748 .compat_ioctl = compat_x25_ioctl,
1749 #endif
1750 .gettstamp = sock_gettstamp,
1751 .listen = x25_listen,
1752 .shutdown = sock_no_shutdown,
1753 .setsockopt = x25_setsockopt,
1754 .getsockopt = x25_getsockopt,
1755 .sendmsg = x25_sendmsg,
1756 .recvmsg = x25_recvmsg,
1757 .mmap = sock_no_mmap,
1758 .sendpage = sock_no_sendpage,
1759 };
1760
1761 static struct packet_type x25_packet_type __read_mostly = {
1762 .type = cpu_to_be16(ETH_P_X25),
1763 .func = x25_lapb_receive_frame,
1764 };
1765
1766 static struct notifier_block x25_dev_notifier = {
1767 .notifier_call = x25_device_event,
1768 };
1769
x25_kill_by_neigh(struct x25_neigh * nb)1770 void x25_kill_by_neigh(struct x25_neigh *nb)
1771 {
1772 struct sock *s;
1773
1774 write_lock_bh(&x25_list_lock);
1775
1776 sk_for_each(s, &x25_list) {
1777 if (x25_sk(s)->neighbour == nb) {
1778 write_unlock_bh(&x25_list_lock);
1779 lock_sock(s);
1780 x25_disconnect(s, ENETUNREACH, 0, 0);
1781 release_sock(s);
1782 write_lock_bh(&x25_list_lock);
1783 }
1784 }
1785 write_unlock_bh(&x25_list_lock);
1786
1787 /* Remove any related forwards */
1788 x25_clear_forward_by_dev(nb->dev);
1789 }
1790
x25_init(void)1791 static int __init x25_init(void)
1792 {
1793 int rc;
1794
1795 rc = proto_register(&x25_proto, 0);
1796 if (rc)
1797 goto out;
1798
1799 rc = sock_register(&x25_family_ops);
1800 if (rc)
1801 goto out_proto;
1802
1803 dev_add_pack(&x25_packet_type);
1804
1805 rc = register_netdevice_notifier(&x25_dev_notifier);
1806 if (rc)
1807 goto out_sock;
1808
1809 rc = x25_register_sysctl();
1810 if (rc)
1811 goto out_dev;
1812
1813 rc = x25_proc_init();
1814 if (rc)
1815 goto out_sysctl;
1816
1817 pr_info("Linux Version 0.2\n");
1818
1819 out:
1820 return rc;
1821 out_sysctl:
1822 x25_unregister_sysctl();
1823 out_dev:
1824 unregister_netdevice_notifier(&x25_dev_notifier);
1825 out_sock:
1826 dev_remove_pack(&x25_packet_type);
1827 sock_unregister(AF_X25);
1828 out_proto:
1829 proto_unregister(&x25_proto);
1830 goto out;
1831 }
1832 module_init(x25_init);
1833
x25_exit(void)1834 static void __exit x25_exit(void)
1835 {
1836 x25_proc_exit();
1837 x25_link_free();
1838 x25_route_free();
1839
1840 x25_unregister_sysctl();
1841
1842 unregister_netdevice_notifier(&x25_dev_notifier);
1843
1844 dev_remove_pack(&x25_packet_type);
1845
1846 sock_unregister(AF_X25);
1847 proto_unregister(&x25_proto);
1848 }
1849 module_exit(x25_exit);
1850
1851 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1852 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1853 MODULE_LICENSE("GPL");
1854 MODULE_ALIAS_NETPROTO(PF_X25);
1855