1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * X.25 Packet Layer release 002
4 *
5 * This is ALPHA test software. This code may break your machine,
6 * randomly fail to work with new releases, misbehave and/or generally
7 * screw up. It might even work.
8 *
9 * This code REQUIRES 2.1.15 or higher
10 *
11 * History
12 * X.25 001 Jonathan Naylor Started coding.
13 * X.25 002 Jonathan Naylor Centralised disconnect handling.
14 * New timer architecture.
15 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant.
16 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of
17 * facilities negotiation and increased
18 * the throughput upper limit.
19 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups
20 * 2000-09-04 Henner Eisen Set sock->state in x25_accept().
21 * Fixed x25_output() related skb leakage.
22 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket.
23 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation.
24 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN
25 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
26 * x25_proc.c, using seq_file
27 * 2005-04-02 Shaun Pereira Selective sub address matching
28 * with call user data
29 * 2005-04-15 Shaun Pereira Fast select with no restriction on
30 * response
31 */
32
33 #define pr_fmt(fmt) "X25: " fmt
34
35 #include <linux/module.h>
36 #include <linux/capability.h>
37 #include <linux/errno.h>
38 #include <linux/kernel.h>
39 #include <linux/sched/signal.h>
40 #include <linux/timer.h>
41 #include <linux/string.h>
42 #include <linux/net.h>
43 #include <linux/netdevice.h>
44 #include <linux/if_arp.h>
45 #include <linux/skbuff.h>
46 #include <linux/slab.h>
47 #include <net/sock.h>
48 #include <net/tcp_states.h>
49 #include <linux/uaccess.h>
50 #include <linux/fcntl.h>
51 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
52 #include <linux/notifier.h>
53 #include <linux/init.h>
54 #include <linux/compat.h>
55 #include <linux/ctype.h>
56
57 #include <net/x25.h>
58 #include <net/compat.h>
59
60 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
61 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
62 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
63 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
64 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
65 int sysctl_x25_forward = 0;
66
67 HLIST_HEAD(x25_list);
68 DEFINE_RWLOCK(x25_list_lock);
69
70 static const struct proto_ops x25_proto_ops;
71
72 static const struct x25_address null_x25_address = {" "};
73
74 #ifdef CONFIG_COMPAT
75 struct compat_x25_subscrip_struct {
76 char device[200-sizeof(compat_ulong_t)];
77 compat_ulong_t global_facil_mask;
78 compat_uint_t extended;
79 };
80 #endif
81
82
x25_parse_address_block(struct sk_buff * skb,struct x25_address * called_addr,struct x25_address * calling_addr)83 int x25_parse_address_block(struct sk_buff *skb,
84 struct x25_address *called_addr,
85 struct x25_address *calling_addr)
86 {
87 unsigned char len;
88 int needed;
89 int rc;
90
91 if (!pskb_may_pull(skb, 1)) {
92 /* packet has no address block */
93 rc = 0;
94 goto empty;
95 }
96
97 len = *skb->data;
98 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
99
100 if (!pskb_may_pull(skb, needed)) {
101 /* packet is too short to hold the addresses it claims
102 to hold */
103 rc = -1;
104 goto empty;
105 }
106
107 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
108
109 empty:
110 *called_addr->x25_addr = 0;
111 *calling_addr->x25_addr = 0;
112
113 return rc;
114 }
115
116
x25_addr_ntoa(unsigned char * p,struct x25_address * called_addr,struct x25_address * calling_addr)117 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
118 struct x25_address *calling_addr)
119 {
120 unsigned int called_len, calling_len;
121 char *called, *calling;
122 unsigned int i;
123
124 called_len = (*p >> 0) & 0x0F;
125 calling_len = (*p >> 4) & 0x0F;
126
127 called = called_addr->x25_addr;
128 calling = calling_addr->x25_addr;
129 p++;
130
131 for (i = 0; i < (called_len + calling_len); i++) {
132 if (i < called_len) {
133 if (i % 2 != 0) {
134 *called++ = ((*p >> 0) & 0x0F) + '0';
135 p++;
136 } else {
137 *called++ = ((*p >> 4) & 0x0F) + '0';
138 }
139 } else {
140 if (i % 2 != 0) {
141 *calling++ = ((*p >> 0) & 0x0F) + '0';
142 p++;
143 } else {
144 *calling++ = ((*p >> 4) & 0x0F) + '0';
145 }
146 }
147 }
148
149 *called = *calling = '\0';
150
151 return 1 + (called_len + calling_len + 1) / 2;
152 }
153
x25_addr_aton(unsigned char * p,struct x25_address * called_addr,struct x25_address * calling_addr)154 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
155 struct x25_address *calling_addr)
156 {
157 unsigned int called_len, calling_len;
158 char *called, *calling;
159 int i;
160
161 called = called_addr->x25_addr;
162 calling = calling_addr->x25_addr;
163
164 called_len = strlen(called);
165 calling_len = strlen(calling);
166
167 *p++ = (calling_len << 4) | (called_len << 0);
168
169 for (i = 0; i < (called_len + calling_len); i++) {
170 if (i < called_len) {
171 if (i % 2 != 0) {
172 *p |= (*called++ - '0') << 0;
173 p++;
174 } else {
175 *p = 0x00;
176 *p |= (*called++ - '0') << 4;
177 }
178 } else {
179 if (i % 2 != 0) {
180 *p |= (*calling++ - '0') << 0;
181 p++;
182 } else {
183 *p = 0x00;
184 *p |= (*calling++ - '0') << 4;
185 }
186 }
187 }
188
189 return 1 + (called_len + calling_len + 1) / 2;
190 }
191
192 /*
193 * Socket removal during an interrupt is now safe.
194 */
x25_remove_socket(struct sock * sk)195 static void x25_remove_socket(struct sock *sk)
196 {
197 write_lock_bh(&x25_list_lock);
198 sk_del_node_init(sk);
199 write_unlock_bh(&x25_list_lock);
200 }
201
202 /*
203 * Kill all bound sockets on a dropped device.
204 */
x25_kill_by_device(struct net_device * dev)205 static void x25_kill_by_device(struct net_device *dev)
206 {
207 struct sock *s;
208
209 write_lock_bh(&x25_list_lock);
210
211 sk_for_each(s, &x25_list)
212 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
213 x25_disconnect(s, ENETUNREACH, 0, 0);
214
215 write_unlock_bh(&x25_list_lock);
216 }
217
218 /*
219 * Handle device status changes.
220 */
x25_device_event(struct notifier_block * this,unsigned long event,void * ptr)221 static int x25_device_event(struct notifier_block *this, unsigned long event,
222 void *ptr)
223 {
224 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
225 struct x25_neigh *nb;
226
227 if (!net_eq(dev_net(dev), &init_net))
228 return NOTIFY_DONE;
229
230 if (dev->type == ARPHRD_X25
231 #if IS_ENABLED(CONFIG_LLC)
232 || dev->type == ARPHRD_ETHER
233 #endif
234 ) {
235 switch (event) {
236 case NETDEV_UP:
237 x25_link_device_up(dev);
238 break;
239 case NETDEV_GOING_DOWN:
240 nb = x25_get_neigh(dev);
241 if (nb) {
242 x25_terminate_link(nb);
243 x25_neigh_put(nb);
244 }
245 break;
246 case NETDEV_DOWN:
247 x25_kill_by_device(dev);
248 x25_route_device_down(dev);
249 x25_link_device_down(dev);
250 break;
251 }
252 }
253
254 return NOTIFY_DONE;
255 }
256
257 /*
258 * Add a socket to the bound sockets list.
259 */
x25_insert_socket(struct sock * sk)260 static void x25_insert_socket(struct sock *sk)
261 {
262 write_lock_bh(&x25_list_lock);
263 sk_add_node(sk, &x25_list);
264 write_unlock_bh(&x25_list_lock);
265 }
266
267 /*
268 * Find a socket that wants to accept the Call Request we just
269 * received. Check the full list for an address/cud match.
270 * If no cuds match return the next_best thing, an address match.
271 * Note: if a listening socket has cud set it must only get calls
272 * with matching cud.
273 */
x25_find_listener(struct x25_address * addr,struct sk_buff * skb)274 static struct sock *x25_find_listener(struct x25_address *addr,
275 struct sk_buff *skb)
276 {
277 struct sock *s;
278 struct sock *next_best;
279
280 read_lock_bh(&x25_list_lock);
281 next_best = NULL;
282
283 sk_for_each(s, &x25_list)
284 if ((!strcmp(addr->x25_addr,
285 x25_sk(s)->source_addr.x25_addr) ||
286 !strcmp(x25_sk(s)->source_addr.x25_addr,
287 null_x25_address.x25_addr)) &&
288 s->sk_state == TCP_LISTEN) {
289 /*
290 * Found a listening socket, now check the incoming
291 * call user data vs this sockets call user data
292 */
293 if (x25_sk(s)->cudmatchlength > 0 &&
294 skb->len >= x25_sk(s)->cudmatchlength) {
295 if((memcmp(x25_sk(s)->calluserdata.cuddata,
296 skb->data,
297 x25_sk(s)->cudmatchlength)) == 0) {
298 sock_hold(s);
299 goto found;
300 }
301 } else
302 next_best = s;
303 }
304 if (next_best) {
305 s = next_best;
306 sock_hold(s);
307 goto found;
308 }
309 s = NULL;
310 found:
311 read_unlock_bh(&x25_list_lock);
312 return s;
313 }
314
315 /*
316 * Find a connected X.25 socket given my LCI and neighbour.
317 */
__x25_find_socket(unsigned int lci,struct x25_neigh * nb)318 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
319 {
320 struct sock *s;
321
322 sk_for_each(s, &x25_list)
323 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
324 sock_hold(s);
325 goto found;
326 }
327 s = NULL;
328 found:
329 return s;
330 }
331
x25_find_socket(unsigned int lci,struct x25_neigh * nb)332 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
333 {
334 struct sock *s;
335
336 read_lock_bh(&x25_list_lock);
337 s = __x25_find_socket(lci, nb);
338 read_unlock_bh(&x25_list_lock);
339 return s;
340 }
341
342 /*
343 * Find a unique LCI for a given device.
344 */
x25_new_lci(struct x25_neigh * nb)345 static unsigned int x25_new_lci(struct x25_neigh *nb)
346 {
347 unsigned int lci = 1;
348 struct sock *sk;
349
350 while ((sk = x25_find_socket(lci, nb)) != NULL) {
351 sock_put(sk);
352 if (++lci == 4096) {
353 lci = 0;
354 break;
355 }
356 cond_resched();
357 }
358
359 return lci;
360 }
361
362 /*
363 * Deferred destroy.
364 */
365 static void __x25_destroy_socket(struct sock *);
366
367 /*
368 * handler for deferred kills.
369 */
x25_destroy_timer(struct timer_list * t)370 static void x25_destroy_timer(struct timer_list *t)
371 {
372 struct sock *sk = from_timer(sk, t, sk_timer);
373
374 x25_destroy_socket_from_timer(sk);
375 }
376
377 /*
378 * This is called from user mode and the timers. Thus it protects itself
379 * against interrupt users but doesn't worry about being called during
380 * work. Once it is removed from the queue no interrupt or bottom half
381 * will touch it and we are (fairly 8-) ) safe.
382 * Not static as it's used by the timer
383 */
__x25_destroy_socket(struct sock * sk)384 static void __x25_destroy_socket(struct sock *sk)
385 {
386 struct sk_buff *skb;
387
388 x25_stop_heartbeat(sk);
389 x25_stop_timer(sk);
390
391 x25_remove_socket(sk);
392 x25_clear_queues(sk); /* Flush the queues */
393
394 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
395 if (skb->sk != sk) { /* A pending connection */
396 /*
397 * Queue the unaccepted socket for death
398 */
399 skb->sk->sk_state = TCP_LISTEN;
400 sock_set_flag(skb->sk, SOCK_DEAD);
401 x25_start_heartbeat(skb->sk);
402 x25_sk(skb->sk)->state = X25_STATE_0;
403 }
404
405 kfree_skb(skb);
406 }
407
408 if (sk_has_allocations(sk)) {
409 /* Defer: outstanding buffers */
410 sk->sk_timer.expires = jiffies + 10 * HZ;
411 sk->sk_timer.function = x25_destroy_timer;
412 add_timer(&sk->sk_timer);
413 } else {
414 /* drop last reference so sock_put will free */
415 __sock_put(sk);
416 }
417 }
418
x25_destroy_socket_from_timer(struct sock * sk)419 void x25_destroy_socket_from_timer(struct sock *sk)
420 {
421 sock_hold(sk);
422 bh_lock_sock(sk);
423 __x25_destroy_socket(sk);
424 bh_unlock_sock(sk);
425 sock_put(sk);
426 }
427
428 /*
429 * Handling for system calls applied via the various interfaces to a
430 * X.25 socket object.
431 */
432
x25_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)433 static int x25_setsockopt(struct socket *sock, int level, int optname,
434 sockptr_t optval, unsigned int optlen)
435 {
436 int opt;
437 struct sock *sk = sock->sk;
438 int rc = -ENOPROTOOPT;
439
440 if (level != SOL_X25 || optname != X25_QBITINCL)
441 goto out;
442
443 rc = -EINVAL;
444 if (optlen < sizeof(int))
445 goto out;
446
447 rc = -EFAULT;
448 if (copy_from_sockptr(&opt, optval, sizeof(int)))
449 goto out;
450
451 if (opt)
452 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
453 else
454 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
455 rc = 0;
456 out:
457 return rc;
458 }
459
x25_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)460 static int x25_getsockopt(struct socket *sock, int level, int optname,
461 char __user *optval, int __user *optlen)
462 {
463 struct sock *sk = sock->sk;
464 int val, len, rc = -ENOPROTOOPT;
465
466 if (level != SOL_X25 || optname != X25_QBITINCL)
467 goto out;
468
469 rc = -EFAULT;
470 if (get_user(len, optlen))
471 goto out;
472
473 len = min_t(unsigned int, len, sizeof(int));
474
475 rc = -EINVAL;
476 if (len < 0)
477 goto out;
478
479 rc = -EFAULT;
480 if (put_user(len, optlen))
481 goto out;
482
483 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
484 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
485 out:
486 return rc;
487 }
488
x25_listen(struct socket * sock,int backlog)489 static int x25_listen(struct socket *sock, int backlog)
490 {
491 struct sock *sk = sock->sk;
492 int rc = -EOPNOTSUPP;
493
494 lock_sock(sk);
495 if (sk->sk_state != TCP_LISTEN) {
496 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
497 sk->sk_max_ack_backlog = backlog;
498 sk->sk_state = TCP_LISTEN;
499 rc = 0;
500 }
501 release_sock(sk);
502
503 return rc;
504 }
505
506 static struct proto x25_proto = {
507 .name = "X25",
508 .owner = THIS_MODULE,
509 .obj_size = sizeof(struct x25_sock),
510 };
511
x25_alloc_socket(struct net * net,int kern)512 static struct sock *x25_alloc_socket(struct net *net, int kern)
513 {
514 struct x25_sock *x25;
515 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
516
517 if (!sk)
518 goto out;
519
520 sock_init_data(NULL, sk);
521
522 x25 = x25_sk(sk);
523 skb_queue_head_init(&x25->ack_queue);
524 skb_queue_head_init(&x25->fragment_queue);
525 skb_queue_head_init(&x25->interrupt_in_queue);
526 skb_queue_head_init(&x25->interrupt_out_queue);
527 out:
528 return sk;
529 }
530
x25_create(struct net * net,struct socket * sock,int protocol,int kern)531 static int x25_create(struct net *net, struct socket *sock, int protocol,
532 int kern)
533 {
534 struct sock *sk;
535 struct x25_sock *x25;
536 int rc = -EAFNOSUPPORT;
537
538 if (!net_eq(net, &init_net))
539 goto out;
540
541 rc = -ESOCKTNOSUPPORT;
542 if (sock->type != SOCK_SEQPACKET)
543 goto out;
544
545 rc = -EINVAL;
546 if (protocol)
547 goto out;
548
549 rc = -ENOBUFS;
550 if ((sk = x25_alloc_socket(net, kern)) == NULL)
551 goto out;
552
553 x25 = x25_sk(sk);
554
555 sock_init_data(sock, sk);
556
557 x25_init_timers(sk);
558
559 sock->ops = &x25_proto_ops;
560 sk->sk_protocol = protocol;
561 sk->sk_backlog_rcv = x25_backlog_rcv;
562
563 x25->t21 = sysctl_x25_call_request_timeout;
564 x25->t22 = sysctl_x25_reset_request_timeout;
565 x25->t23 = sysctl_x25_clear_request_timeout;
566 x25->t2 = sysctl_x25_ack_holdback_timeout;
567 x25->state = X25_STATE_0;
568 x25->cudmatchlength = 0;
569 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
570 /* on call accept */
571
572 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
573 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
574 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
575 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
576 x25->facilities.throughput = 0; /* by default don't negotiate
577 throughput */
578 x25->facilities.reverse = X25_DEFAULT_REVERSE;
579 x25->dte_facilities.calling_len = 0;
580 x25->dte_facilities.called_len = 0;
581 memset(x25->dte_facilities.called_ae, '\0',
582 sizeof(x25->dte_facilities.called_ae));
583 memset(x25->dte_facilities.calling_ae, '\0',
584 sizeof(x25->dte_facilities.calling_ae));
585
586 rc = 0;
587 out:
588 return rc;
589 }
590
x25_make_new(struct sock * osk)591 static struct sock *x25_make_new(struct sock *osk)
592 {
593 struct sock *sk = NULL;
594 struct x25_sock *x25, *ox25;
595
596 if (osk->sk_type != SOCK_SEQPACKET)
597 goto out;
598
599 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
600 goto out;
601
602 x25 = x25_sk(sk);
603
604 sk->sk_type = osk->sk_type;
605 sk->sk_priority = osk->sk_priority;
606 sk->sk_protocol = osk->sk_protocol;
607 sk->sk_rcvbuf = osk->sk_rcvbuf;
608 sk->sk_sndbuf = osk->sk_sndbuf;
609 sk->sk_state = TCP_ESTABLISHED;
610 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
611 sock_copy_flags(sk, osk);
612
613 ox25 = x25_sk(osk);
614 x25->t21 = ox25->t21;
615 x25->t22 = ox25->t22;
616 x25->t23 = ox25->t23;
617 x25->t2 = ox25->t2;
618 x25->flags = ox25->flags;
619 x25->facilities = ox25->facilities;
620 x25->dte_facilities = ox25->dte_facilities;
621 x25->cudmatchlength = ox25->cudmatchlength;
622
623 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
624 x25_init_timers(sk);
625 out:
626 return sk;
627 }
628
x25_release(struct socket * sock)629 static int x25_release(struct socket *sock)
630 {
631 struct sock *sk = sock->sk;
632 struct x25_sock *x25;
633
634 if (!sk)
635 return 0;
636
637 x25 = x25_sk(sk);
638
639 sock_hold(sk);
640 lock_sock(sk);
641 switch (x25->state) {
642
643 case X25_STATE_0:
644 case X25_STATE_2:
645 x25_disconnect(sk, 0, 0, 0);
646 __x25_destroy_socket(sk);
647 goto out;
648
649 case X25_STATE_1:
650 case X25_STATE_3:
651 case X25_STATE_4:
652 x25_clear_queues(sk);
653 x25_write_internal(sk, X25_CLEAR_REQUEST);
654 x25_start_t23timer(sk);
655 x25->state = X25_STATE_2;
656 sk->sk_state = TCP_CLOSE;
657 sk->sk_shutdown |= SEND_SHUTDOWN;
658 sk->sk_state_change(sk);
659 sock_set_flag(sk, SOCK_DEAD);
660 sock_set_flag(sk, SOCK_DESTROY);
661 break;
662
663 case X25_STATE_5:
664 x25_write_internal(sk, X25_CLEAR_REQUEST);
665 x25_disconnect(sk, 0, 0, 0);
666 __x25_destroy_socket(sk);
667 goto out;
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_acceptq_removed(sk);
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 } else {
1071 makex25->state = X25_STATE_5;
1072 }
1073
1074 /*
1075 * Incoming Call User Data.
1076 */
1077 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1078 makex25->calluserdata.cudlength = skb->len;
1079
1080 sk_acceptq_added(sk);
1081
1082 x25_insert_socket(make);
1083
1084 skb_queue_head(&sk->sk_receive_queue, skb);
1085
1086 x25_start_heartbeat(make);
1087
1088 if (!sock_flag(sk, SOCK_DEAD))
1089 sk->sk_data_ready(sk);
1090 rc = 1;
1091 sock_put(sk);
1092 out:
1093 return rc;
1094 out_sock_put:
1095 sock_put(sk);
1096 out_clear_request:
1097 rc = 0;
1098 x25_transmit_clear_request(nb, lci, 0x01);
1099 goto out;
1100 }
1101
x25_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)1102 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1103 {
1104 struct sock *sk = sock->sk;
1105 struct x25_sock *x25 = x25_sk(sk);
1106 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1107 struct sockaddr_x25 sx25;
1108 struct sk_buff *skb;
1109 unsigned char *asmptr;
1110 int noblock = msg->msg_flags & MSG_DONTWAIT;
1111 size_t size;
1112 int qbit = 0, rc = -EINVAL;
1113
1114 lock_sock(sk);
1115 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1116 goto out;
1117
1118 /* we currently don't support segmented records at the user interface */
1119 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1120 goto out;
1121
1122 rc = -EADDRNOTAVAIL;
1123 if (sock_flag(sk, SOCK_ZAPPED))
1124 goto out;
1125
1126 rc = -EPIPE;
1127 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1128 send_sig(SIGPIPE, current, 0);
1129 goto out;
1130 }
1131
1132 rc = -ENETUNREACH;
1133 if (!x25->neighbour)
1134 goto out;
1135
1136 if (usx25) {
1137 rc = -EINVAL;
1138 if (msg->msg_namelen < sizeof(sx25))
1139 goto out;
1140 memcpy(&sx25, usx25, sizeof(sx25));
1141 rc = -EISCONN;
1142 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1143 goto out;
1144 rc = -EINVAL;
1145 if (sx25.sx25_family != AF_X25)
1146 goto out;
1147 } else {
1148 /*
1149 * FIXME 1003.1g - if the socket is like this because
1150 * it has become closed (not started closed) we ought
1151 * to SIGPIPE, EPIPE;
1152 */
1153 rc = -ENOTCONN;
1154 if (sk->sk_state != TCP_ESTABLISHED)
1155 goto out;
1156
1157 sx25.sx25_family = AF_X25;
1158 sx25.sx25_addr = x25->dest_addr;
1159 }
1160
1161 /* Sanity check the packet size */
1162 if (len > 65535) {
1163 rc = -EMSGSIZE;
1164 goto out;
1165 }
1166
1167 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1168
1169 /* Build a packet */
1170 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1171
1172 if ((msg->msg_flags & MSG_OOB) && len > 32)
1173 len = 32;
1174
1175 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1176
1177 release_sock(sk);
1178 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1179 lock_sock(sk);
1180 if (!skb)
1181 goto out;
1182 X25_SKB_CB(skb)->flags = msg->msg_flags;
1183
1184 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1185
1186 /*
1187 * Put the data on the end
1188 */
1189 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1190
1191 skb_reset_transport_header(skb);
1192 skb_put(skb, len);
1193
1194 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1195 if (rc)
1196 goto out_kfree_skb;
1197
1198 /*
1199 * If the Q BIT Include socket option is in force, the first
1200 * byte of the user data is the logical value of the Q Bit.
1201 */
1202 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1203 if (!pskb_may_pull(skb, 1))
1204 goto out_kfree_skb;
1205
1206 qbit = skb->data[0];
1207 skb_pull(skb, 1);
1208 }
1209
1210 /*
1211 * Push down the X.25 header
1212 */
1213 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1214
1215 if (msg->msg_flags & MSG_OOB) {
1216 if (x25->neighbour->extended) {
1217 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1218 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1219 *asmptr++ = (x25->lci >> 0) & 0xFF;
1220 *asmptr++ = X25_INTERRUPT;
1221 } else {
1222 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1223 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1224 *asmptr++ = (x25->lci >> 0) & 0xFF;
1225 *asmptr++ = X25_INTERRUPT;
1226 }
1227 } else {
1228 if (x25->neighbour->extended) {
1229 /* Build an Extended X.25 header */
1230 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1231 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1232 *asmptr++ = (x25->lci >> 0) & 0xFF;
1233 *asmptr++ = X25_DATA;
1234 *asmptr++ = X25_DATA;
1235 } else {
1236 /* Build an Standard X.25 header */
1237 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1238 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1239 *asmptr++ = (x25->lci >> 0) & 0xFF;
1240 *asmptr++ = X25_DATA;
1241 }
1242
1243 if (qbit)
1244 skb->data[0] |= X25_Q_BIT;
1245 }
1246
1247 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1248 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1249
1250 rc = -ENOTCONN;
1251 if (sk->sk_state != TCP_ESTABLISHED)
1252 goto out_kfree_skb;
1253
1254 if (msg->msg_flags & MSG_OOB)
1255 skb_queue_tail(&x25->interrupt_out_queue, skb);
1256 else {
1257 rc = x25_output(sk, skb);
1258 len = rc;
1259 if (rc < 0)
1260 kfree_skb(skb);
1261 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1262 len++;
1263 }
1264
1265 x25_kick(sk);
1266 rc = len;
1267 out:
1268 release_sock(sk);
1269 return rc;
1270 out_kfree_skb:
1271 kfree_skb(skb);
1272 goto out;
1273 }
1274
1275
x25_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)1276 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1277 int flags)
1278 {
1279 struct sock *sk = sock->sk;
1280 struct x25_sock *x25 = x25_sk(sk);
1281 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1282 size_t copied;
1283 int qbit, header_len;
1284 struct sk_buff *skb;
1285 unsigned char *asmptr;
1286 int rc = -ENOTCONN;
1287
1288 lock_sock(sk);
1289
1290 if (x25->neighbour == NULL)
1291 goto out;
1292
1293 header_len = x25->neighbour->extended ?
1294 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1295
1296 /*
1297 * This works for seqpacket too. The receiver has ordered the queue for
1298 * us! We do one quick check first though
1299 */
1300 if (sk->sk_state != TCP_ESTABLISHED)
1301 goto out;
1302
1303 if (flags & MSG_OOB) {
1304 rc = -EINVAL;
1305 if (sock_flag(sk, SOCK_URGINLINE) ||
1306 !skb_peek(&x25->interrupt_in_queue))
1307 goto out;
1308
1309 skb = skb_dequeue(&x25->interrupt_in_queue);
1310
1311 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1312 goto out_free_dgram;
1313
1314 skb_pull(skb, X25_STD_MIN_LEN);
1315
1316 /*
1317 * No Q bit information on Interrupt data.
1318 */
1319 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1320 asmptr = skb_push(skb, 1);
1321 *asmptr = 0x00;
1322 }
1323
1324 msg->msg_flags |= MSG_OOB;
1325 } else {
1326 /* Now we can treat all alike */
1327 release_sock(sk);
1328 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1329 flags & MSG_DONTWAIT, &rc);
1330 lock_sock(sk);
1331 if (!skb)
1332 goto out;
1333
1334 if (!pskb_may_pull(skb, header_len))
1335 goto out_free_dgram;
1336
1337 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1338
1339 skb_pull(skb, header_len);
1340
1341 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1342 asmptr = skb_push(skb, 1);
1343 *asmptr = qbit;
1344 }
1345 }
1346
1347 skb_reset_transport_header(skb);
1348 copied = skb->len;
1349
1350 if (copied > size) {
1351 copied = size;
1352 msg->msg_flags |= MSG_TRUNC;
1353 }
1354
1355 /* Currently, each datagram always contains a complete record */
1356 msg->msg_flags |= MSG_EOR;
1357
1358 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1359 if (rc)
1360 goto out_free_dgram;
1361
1362 if (sx25) {
1363 sx25->sx25_family = AF_X25;
1364 sx25->sx25_addr = x25->dest_addr;
1365 msg->msg_namelen = sizeof(*sx25);
1366 }
1367
1368 x25_check_rbuf(sk);
1369 rc = copied;
1370 out_free_dgram:
1371 skb_free_datagram(sk, skb);
1372 out:
1373 release_sock(sk);
1374 return rc;
1375 }
1376
1377
x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1378 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1379 {
1380 struct sock *sk = sock->sk;
1381 struct x25_sock *x25 = x25_sk(sk);
1382 void __user *argp = (void __user *)arg;
1383 int rc;
1384
1385 switch (cmd) {
1386 case TIOCOUTQ: {
1387 int amount;
1388
1389 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1390 if (amount < 0)
1391 amount = 0;
1392 rc = put_user(amount, (unsigned int __user *)argp);
1393 break;
1394 }
1395
1396 case TIOCINQ: {
1397 struct sk_buff *skb;
1398 int amount = 0;
1399 /*
1400 * These two are safe on a single CPU system as
1401 * only user tasks fiddle here
1402 */
1403 lock_sock(sk);
1404 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1405 amount = skb->len;
1406 release_sock(sk);
1407 rc = put_user(amount, (unsigned int __user *)argp);
1408 break;
1409 }
1410
1411 case SIOCGIFADDR:
1412 case SIOCSIFADDR:
1413 case SIOCGIFDSTADDR:
1414 case SIOCSIFDSTADDR:
1415 case SIOCGIFBRDADDR:
1416 case SIOCSIFBRDADDR:
1417 case SIOCGIFNETMASK:
1418 case SIOCSIFNETMASK:
1419 case SIOCGIFMETRIC:
1420 case SIOCSIFMETRIC:
1421 rc = -EINVAL;
1422 break;
1423 case SIOCADDRT:
1424 case SIOCDELRT:
1425 rc = -EPERM;
1426 if (!capable(CAP_NET_ADMIN))
1427 break;
1428 rc = x25_route_ioctl(cmd, argp);
1429 break;
1430 case SIOCX25GSUBSCRIP:
1431 rc = x25_subscr_ioctl(cmd, argp);
1432 break;
1433 case SIOCX25SSUBSCRIP:
1434 rc = -EPERM;
1435 if (!capable(CAP_NET_ADMIN))
1436 break;
1437 rc = x25_subscr_ioctl(cmd, argp);
1438 break;
1439 case SIOCX25GFACILITIES: {
1440 lock_sock(sk);
1441 rc = copy_to_user(argp, &x25->facilities,
1442 sizeof(x25->facilities))
1443 ? -EFAULT : 0;
1444 release_sock(sk);
1445 break;
1446 }
1447
1448 case SIOCX25SFACILITIES: {
1449 struct x25_facilities facilities;
1450 rc = -EFAULT;
1451 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1452 break;
1453 rc = -EINVAL;
1454 lock_sock(sk);
1455 if (sk->sk_state != TCP_LISTEN &&
1456 sk->sk_state != TCP_CLOSE)
1457 goto out_fac_release;
1458 if (facilities.pacsize_in < X25_PS16 ||
1459 facilities.pacsize_in > X25_PS4096)
1460 goto out_fac_release;
1461 if (facilities.pacsize_out < X25_PS16 ||
1462 facilities.pacsize_out > X25_PS4096)
1463 goto out_fac_release;
1464 if (facilities.winsize_in < 1 ||
1465 facilities.winsize_in > 127)
1466 goto out_fac_release;
1467 if (facilities.throughput) {
1468 int out = facilities.throughput & 0xf0;
1469 int in = facilities.throughput & 0x0f;
1470 if (!out)
1471 facilities.throughput |=
1472 X25_DEFAULT_THROUGHPUT << 4;
1473 else if (out < 0x30 || out > 0xD0)
1474 goto out_fac_release;
1475 if (!in)
1476 facilities.throughput |=
1477 X25_DEFAULT_THROUGHPUT;
1478 else if (in < 0x03 || in > 0x0D)
1479 goto out_fac_release;
1480 }
1481 if (facilities.reverse &&
1482 (facilities.reverse & 0x81) != 0x81)
1483 goto out_fac_release;
1484 x25->facilities = facilities;
1485 rc = 0;
1486 out_fac_release:
1487 release_sock(sk);
1488 break;
1489 }
1490
1491 case SIOCX25GDTEFACILITIES: {
1492 lock_sock(sk);
1493 rc = copy_to_user(argp, &x25->dte_facilities,
1494 sizeof(x25->dte_facilities));
1495 release_sock(sk);
1496 if (rc)
1497 rc = -EFAULT;
1498 break;
1499 }
1500
1501 case SIOCX25SDTEFACILITIES: {
1502 struct x25_dte_facilities dtefacs;
1503 rc = -EFAULT;
1504 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1505 break;
1506 rc = -EINVAL;
1507 lock_sock(sk);
1508 if (sk->sk_state != TCP_LISTEN &&
1509 sk->sk_state != TCP_CLOSE)
1510 goto out_dtefac_release;
1511 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1512 goto out_dtefac_release;
1513 if (dtefacs.called_len > X25_MAX_AE_LEN)
1514 goto out_dtefac_release;
1515 x25->dte_facilities = dtefacs;
1516 rc = 0;
1517 out_dtefac_release:
1518 release_sock(sk);
1519 break;
1520 }
1521
1522 case SIOCX25GCALLUSERDATA: {
1523 lock_sock(sk);
1524 rc = copy_to_user(argp, &x25->calluserdata,
1525 sizeof(x25->calluserdata))
1526 ? -EFAULT : 0;
1527 release_sock(sk);
1528 break;
1529 }
1530
1531 case SIOCX25SCALLUSERDATA: {
1532 struct x25_calluserdata calluserdata;
1533
1534 rc = -EFAULT;
1535 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1536 break;
1537 rc = -EINVAL;
1538 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1539 break;
1540 lock_sock(sk);
1541 x25->calluserdata = calluserdata;
1542 release_sock(sk);
1543 rc = 0;
1544 break;
1545 }
1546
1547 case SIOCX25GCAUSEDIAG: {
1548 lock_sock(sk);
1549 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1550 ? -EFAULT : 0;
1551 release_sock(sk);
1552 break;
1553 }
1554
1555 case SIOCX25SCAUSEDIAG: {
1556 struct x25_causediag causediag;
1557 rc = -EFAULT;
1558 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1559 break;
1560 lock_sock(sk);
1561 x25->causediag = causediag;
1562 release_sock(sk);
1563 rc = 0;
1564 break;
1565
1566 }
1567
1568 case SIOCX25SCUDMATCHLEN: {
1569 struct x25_subaddr sub_addr;
1570 rc = -EINVAL;
1571 lock_sock(sk);
1572 if(sk->sk_state != TCP_CLOSE)
1573 goto out_cud_release;
1574 rc = -EFAULT;
1575 if (copy_from_user(&sub_addr, argp,
1576 sizeof(sub_addr)))
1577 goto out_cud_release;
1578 rc = -EINVAL;
1579 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1580 goto out_cud_release;
1581 x25->cudmatchlength = sub_addr.cudmatchlength;
1582 rc = 0;
1583 out_cud_release:
1584 release_sock(sk);
1585 break;
1586 }
1587
1588 case SIOCX25CALLACCPTAPPRV: {
1589 rc = -EINVAL;
1590 lock_sock(sk);
1591 if (sk->sk_state == TCP_CLOSE) {
1592 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1593 rc = 0;
1594 }
1595 release_sock(sk);
1596 break;
1597 }
1598
1599 case SIOCX25SENDCALLACCPT: {
1600 rc = -EINVAL;
1601 lock_sock(sk);
1602 if (sk->sk_state != TCP_ESTABLISHED)
1603 goto out_sendcallaccpt_release;
1604 /* must call accptapprv above */
1605 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1606 goto out_sendcallaccpt_release;
1607 x25_write_internal(sk, X25_CALL_ACCEPTED);
1608 x25->state = X25_STATE_3;
1609 rc = 0;
1610 out_sendcallaccpt_release:
1611 release_sock(sk);
1612 break;
1613 }
1614
1615 default:
1616 rc = -ENOIOCTLCMD;
1617 break;
1618 }
1619
1620 return rc;
1621 }
1622
1623 static const struct net_proto_family x25_family_ops = {
1624 .family = AF_X25,
1625 .create = x25_create,
1626 .owner = THIS_MODULE,
1627 };
1628
1629 #ifdef CONFIG_COMPAT
compat_x25_subscr_ioctl(unsigned int cmd,struct compat_x25_subscrip_struct __user * x25_subscr32)1630 static int compat_x25_subscr_ioctl(unsigned int cmd,
1631 struct compat_x25_subscrip_struct __user *x25_subscr32)
1632 {
1633 struct compat_x25_subscrip_struct x25_subscr;
1634 struct x25_neigh *nb;
1635 struct net_device *dev;
1636 int rc = -EINVAL;
1637
1638 rc = -EFAULT;
1639 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1640 goto out;
1641
1642 rc = -EINVAL;
1643 dev = x25_dev_get(x25_subscr.device);
1644 if (dev == NULL)
1645 goto out;
1646
1647 nb = x25_get_neigh(dev);
1648 if (nb == NULL)
1649 goto out_dev_put;
1650
1651 dev_put(dev);
1652
1653 if (cmd == SIOCX25GSUBSCRIP) {
1654 read_lock_bh(&x25_neigh_list_lock);
1655 x25_subscr.extended = nb->extended;
1656 x25_subscr.global_facil_mask = nb->global_facil_mask;
1657 read_unlock_bh(&x25_neigh_list_lock);
1658 rc = copy_to_user(x25_subscr32, &x25_subscr,
1659 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1660 } else {
1661 rc = -EINVAL;
1662 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1663 rc = 0;
1664 write_lock_bh(&x25_neigh_list_lock);
1665 nb->extended = x25_subscr.extended;
1666 nb->global_facil_mask = x25_subscr.global_facil_mask;
1667 write_unlock_bh(&x25_neigh_list_lock);
1668 }
1669 }
1670 x25_neigh_put(nb);
1671 out:
1672 return rc;
1673 out_dev_put:
1674 dev_put(dev);
1675 goto out;
1676 }
1677
compat_x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1678 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1679 unsigned long arg)
1680 {
1681 void __user *argp = compat_ptr(arg);
1682 int rc = -ENOIOCTLCMD;
1683
1684 switch(cmd) {
1685 case TIOCOUTQ:
1686 case TIOCINQ:
1687 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1688 break;
1689 case SIOCGIFADDR:
1690 case SIOCSIFADDR:
1691 case SIOCGIFDSTADDR:
1692 case SIOCSIFDSTADDR:
1693 case SIOCGIFBRDADDR:
1694 case SIOCSIFBRDADDR:
1695 case SIOCGIFNETMASK:
1696 case SIOCSIFNETMASK:
1697 case SIOCGIFMETRIC:
1698 case SIOCSIFMETRIC:
1699 rc = -EINVAL;
1700 break;
1701 case SIOCADDRT:
1702 case SIOCDELRT:
1703 rc = -EPERM;
1704 if (!capable(CAP_NET_ADMIN))
1705 break;
1706 rc = x25_route_ioctl(cmd, argp);
1707 break;
1708 case SIOCX25GSUBSCRIP:
1709 rc = compat_x25_subscr_ioctl(cmd, argp);
1710 break;
1711 case SIOCX25SSUBSCRIP:
1712 rc = -EPERM;
1713 if (!capable(CAP_NET_ADMIN))
1714 break;
1715 rc = compat_x25_subscr_ioctl(cmd, argp);
1716 break;
1717 case SIOCX25GFACILITIES:
1718 case SIOCX25SFACILITIES:
1719 case SIOCX25GDTEFACILITIES:
1720 case SIOCX25SDTEFACILITIES:
1721 case SIOCX25GCALLUSERDATA:
1722 case SIOCX25SCALLUSERDATA:
1723 case SIOCX25GCAUSEDIAG:
1724 case SIOCX25SCAUSEDIAG:
1725 case SIOCX25SCUDMATCHLEN:
1726 case SIOCX25CALLACCPTAPPRV:
1727 case SIOCX25SENDCALLACCPT:
1728 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1729 break;
1730 default:
1731 rc = -ENOIOCTLCMD;
1732 break;
1733 }
1734 return rc;
1735 }
1736 #endif
1737
1738 static const struct proto_ops x25_proto_ops = {
1739 .family = AF_X25,
1740 .owner = THIS_MODULE,
1741 .release = x25_release,
1742 .bind = x25_bind,
1743 .connect = x25_connect,
1744 .socketpair = sock_no_socketpair,
1745 .accept = x25_accept,
1746 .getname = x25_getname,
1747 .poll = datagram_poll,
1748 .ioctl = x25_ioctl,
1749 #ifdef CONFIG_COMPAT
1750 .compat_ioctl = compat_x25_ioctl,
1751 #endif
1752 .gettstamp = sock_gettstamp,
1753 .listen = x25_listen,
1754 .shutdown = sock_no_shutdown,
1755 .setsockopt = x25_setsockopt,
1756 .getsockopt = x25_getsockopt,
1757 .sendmsg = x25_sendmsg,
1758 .recvmsg = x25_recvmsg,
1759 .mmap = sock_no_mmap,
1760 .sendpage = sock_no_sendpage,
1761 };
1762
1763 static struct packet_type x25_packet_type __read_mostly = {
1764 .type = cpu_to_be16(ETH_P_X25),
1765 .func = x25_lapb_receive_frame,
1766 };
1767
1768 static struct notifier_block x25_dev_notifier = {
1769 .notifier_call = x25_device_event,
1770 };
1771
x25_kill_by_neigh(struct x25_neigh * nb)1772 void x25_kill_by_neigh(struct x25_neigh *nb)
1773 {
1774 struct sock *s;
1775
1776 write_lock_bh(&x25_list_lock);
1777
1778 sk_for_each(s, &x25_list)
1779 if (x25_sk(s)->neighbour == nb)
1780 x25_disconnect(s, ENETUNREACH, 0, 0);
1781
1782 write_unlock_bh(&x25_list_lock);
1783
1784 /* Remove any related forwards */
1785 x25_clear_forward_by_dev(nb->dev);
1786 }
1787
x25_init(void)1788 static int __init x25_init(void)
1789 {
1790 int rc;
1791
1792 rc = proto_register(&x25_proto, 0);
1793 if (rc)
1794 goto out;
1795
1796 rc = sock_register(&x25_family_ops);
1797 if (rc)
1798 goto out_proto;
1799
1800 dev_add_pack(&x25_packet_type);
1801
1802 rc = register_netdevice_notifier(&x25_dev_notifier);
1803 if (rc)
1804 goto out_sock;
1805
1806 rc = x25_register_sysctl();
1807 if (rc)
1808 goto out_dev;
1809
1810 rc = x25_proc_init();
1811 if (rc)
1812 goto out_sysctl;
1813
1814 pr_info("Linux Version 0.2\n");
1815
1816 out:
1817 return rc;
1818 out_sysctl:
1819 x25_unregister_sysctl();
1820 out_dev:
1821 unregister_netdevice_notifier(&x25_dev_notifier);
1822 out_sock:
1823 dev_remove_pack(&x25_packet_type);
1824 sock_unregister(AF_X25);
1825 out_proto:
1826 proto_unregister(&x25_proto);
1827 goto out;
1828 }
1829 module_init(x25_init);
1830
x25_exit(void)1831 static void __exit x25_exit(void)
1832 {
1833 x25_proc_exit();
1834 x25_link_free();
1835 x25_route_free();
1836
1837 x25_unregister_sysctl();
1838
1839 unregister_netdevice_notifier(&x25_dev_notifier);
1840
1841 dev_remove_pack(&x25_packet_type);
1842
1843 sock_unregister(AF_X25);
1844 proto_unregister(&x25_proto);
1845 }
1846 module_exit(x25_exit);
1847
1848 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1849 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1850 MODULE_LICENSE("GPL");
1851 MODULE_ALIAS_NETPROTO(PF_X25);
1852
