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 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
664 sock_orphan(sk);
665 out:
666 release_sock(sk);
667 sock_put(sk);
668 return 0;
669 }
670
x25_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)671 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
672 {
673 struct sock *sk = sock->sk;
674 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
675 int len, i, rc = 0;
676
677 if (addr_len != sizeof(struct sockaddr_x25) ||
678 addr->sx25_family != AF_X25) {
679 rc = -EINVAL;
680 goto out;
681 }
682
683 /* check for the null_x25_address */
684 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
685
686 len = strlen(addr->sx25_addr.x25_addr);
687 for (i = 0; i < len; i++) {
688 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
689 rc = -EINVAL;
690 goto out;
691 }
692 }
693 }
694
695 lock_sock(sk);
696 if (sock_flag(sk, SOCK_ZAPPED)) {
697 x25_sk(sk)->source_addr = addr->sx25_addr;
698 x25_insert_socket(sk);
699 sock_reset_flag(sk, SOCK_ZAPPED);
700 } else {
701 rc = -EINVAL;
702 }
703 release_sock(sk);
704 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
705 out:
706 return rc;
707 }
708
x25_wait_for_connection_establishment(struct sock * sk)709 static int x25_wait_for_connection_establishment(struct sock *sk)
710 {
711 DECLARE_WAITQUEUE(wait, current);
712 int rc;
713
714 add_wait_queue_exclusive(sk_sleep(sk), &wait);
715 for (;;) {
716 __set_current_state(TASK_INTERRUPTIBLE);
717 rc = -ERESTARTSYS;
718 if (signal_pending(current))
719 break;
720 rc = sock_error(sk);
721 if (rc) {
722 sk->sk_socket->state = SS_UNCONNECTED;
723 break;
724 }
725 rc = 0;
726 if (sk->sk_state != TCP_ESTABLISHED) {
727 release_sock(sk);
728 schedule();
729 lock_sock(sk);
730 } else
731 break;
732 }
733 __set_current_state(TASK_RUNNING);
734 remove_wait_queue(sk_sleep(sk), &wait);
735 return rc;
736 }
737
x25_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)738 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
739 int addr_len, int flags)
740 {
741 struct sock *sk = sock->sk;
742 struct x25_sock *x25 = x25_sk(sk);
743 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
744 struct x25_route *rt;
745 int rc = 0;
746
747 lock_sock(sk);
748 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
749 sock->state = SS_CONNECTED;
750 goto out; /* Connect completed during a ERESTARTSYS event */
751 }
752
753 rc = -ECONNREFUSED;
754 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
755 sock->state = SS_UNCONNECTED;
756 goto out;
757 }
758
759 rc = -EISCONN; /* No reconnect on a seqpacket socket */
760 if (sk->sk_state == TCP_ESTABLISHED)
761 goto out;
762
763 rc = -EALREADY; /* Do nothing if call is already in progress */
764 if (sk->sk_state == TCP_SYN_SENT)
765 goto out;
766
767 sk->sk_state = TCP_CLOSE;
768 sock->state = SS_UNCONNECTED;
769
770 rc = -EINVAL;
771 if (addr_len != sizeof(struct sockaddr_x25) ||
772 addr->sx25_family != AF_X25)
773 goto out;
774
775 rc = -ENETUNREACH;
776 rt = x25_get_route(&addr->sx25_addr);
777 if (!rt)
778 goto out;
779
780 x25->neighbour = x25_get_neigh(rt->dev);
781 if (!x25->neighbour)
782 goto out_put_route;
783
784 x25_limit_facilities(&x25->facilities, x25->neighbour);
785
786 x25->lci = x25_new_lci(x25->neighbour);
787 if (!x25->lci)
788 goto out_put_neigh;
789
790 rc = -EINVAL;
791 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
792 goto out_put_neigh;
793
794 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
795 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
796
797 x25->dest_addr = addr->sx25_addr;
798
799 /* Move to connecting socket, start sending Connect Requests */
800 sock->state = SS_CONNECTING;
801 sk->sk_state = TCP_SYN_SENT;
802
803 x25->state = X25_STATE_1;
804
805 x25_write_internal(sk, X25_CALL_REQUEST);
806
807 x25_start_heartbeat(sk);
808 x25_start_t21timer(sk);
809
810 /* Now the loop */
811 rc = -EINPROGRESS;
812 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
813 goto out;
814
815 rc = x25_wait_for_connection_establishment(sk);
816 if (rc)
817 goto out_put_neigh;
818
819 sock->state = SS_CONNECTED;
820 rc = 0;
821 out_put_neigh:
822 if (rc) {
823 read_lock_bh(&x25_list_lock);
824 x25_neigh_put(x25->neighbour);
825 x25->neighbour = NULL;
826 read_unlock_bh(&x25_list_lock);
827 x25->state = X25_STATE_0;
828 }
829 out_put_route:
830 x25_route_put(rt);
831 out:
832 release_sock(sk);
833 return rc;
834 }
835
x25_wait_for_data(struct sock * sk,long timeout)836 static int x25_wait_for_data(struct sock *sk, long timeout)
837 {
838 DECLARE_WAITQUEUE(wait, current);
839 int rc = 0;
840
841 add_wait_queue_exclusive(sk_sleep(sk), &wait);
842 for (;;) {
843 __set_current_state(TASK_INTERRUPTIBLE);
844 if (sk->sk_shutdown & RCV_SHUTDOWN)
845 break;
846 rc = -ERESTARTSYS;
847 if (signal_pending(current))
848 break;
849 rc = -EAGAIN;
850 if (!timeout)
851 break;
852 rc = 0;
853 if (skb_queue_empty(&sk->sk_receive_queue)) {
854 release_sock(sk);
855 timeout = schedule_timeout(timeout);
856 lock_sock(sk);
857 } else
858 break;
859 }
860 __set_current_state(TASK_RUNNING);
861 remove_wait_queue(sk_sleep(sk), &wait);
862 return rc;
863 }
864
x25_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)865 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
866 bool kern)
867 {
868 struct sock *sk = sock->sk;
869 struct sock *newsk;
870 struct sk_buff *skb;
871 int rc = -EINVAL;
872
873 if (!sk)
874 goto out;
875
876 rc = -EOPNOTSUPP;
877 if (sk->sk_type != SOCK_SEQPACKET)
878 goto out;
879
880 lock_sock(sk);
881 rc = -EINVAL;
882 if (sk->sk_state != TCP_LISTEN)
883 goto out2;
884
885 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
886 if (rc)
887 goto out2;
888 skb = skb_dequeue(&sk->sk_receive_queue);
889 rc = -EINVAL;
890 if (!skb->sk)
891 goto out2;
892 newsk = skb->sk;
893 sock_graft(newsk, newsock);
894
895 /* Now attach up the new socket */
896 skb->sk = NULL;
897 kfree_skb(skb);
898 sk->sk_ack_backlog--;
899 newsock->state = SS_CONNECTED;
900 rc = 0;
901 out2:
902 release_sock(sk);
903 out:
904 return rc;
905 }
906
x25_getname(struct socket * sock,struct sockaddr * uaddr,int peer)907 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
908 int peer)
909 {
910 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
911 struct sock *sk = sock->sk;
912 struct x25_sock *x25 = x25_sk(sk);
913 int rc = 0;
914
915 if (peer) {
916 if (sk->sk_state != TCP_ESTABLISHED) {
917 rc = -ENOTCONN;
918 goto out;
919 }
920 sx25->sx25_addr = x25->dest_addr;
921 } else
922 sx25->sx25_addr = x25->source_addr;
923
924 sx25->sx25_family = AF_X25;
925 rc = sizeof(*sx25);
926
927 out:
928 return rc;
929 }
930
x25_rx_call_request(struct sk_buff * skb,struct x25_neigh * nb,unsigned int lci)931 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
932 unsigned int lci)
933 {
934 struct sock *sk;
935 struct sock *make;
936 struct x25_sock *makex25;
937 struct x25_address source_addr, dest_addr;
938 struct x25_facilities facilities;
939 struct x25_dte_facilities dte_facilities;
940 int len, addr_len, rc;
941
942 /*
943 * Remove the LCI and frame type.
944 */
945 skb_pull(skb, X25_STD_MIN_LEN);
946
947 /*
948 * Extract the X.25 addresses and convert them to ASCII strings,
949 * and remove them.
950 *
951 * Address block is mandatory in call request packets
952 */
953 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
954 if (addr_len <= 0)
955 goto out_clear_request;
956 skb_pull(skb, addr_len);
957
958 /*
959 * Get the length of the facilities, skip past them for the moment
960 * get the call user data because this is needed to determine
961 * the correct listener
962 *
963 * Facilities length is mandatory in call request packets
964 */
965 if (!pskb_may_pull(skb, 1))
966 goto out_clear_request;
967 len = skb->data[0] + 1;
968 if (!pskb_may_pull(skb, len))
969 goto out_clear_request;
970 skb_pull(skb,len);
971
972 /*
973 * Ensure that the amount of call user data is valid.
974 */
975 if (skb->len > X25_MAX_CUD_LEN)
976 goto out_clear_request;
977
978 /*
979 * Get all the call user data so it can be used in
980 * x25_find_listener and skb_copy_from_linear_data up ahead.
981 */
982 if (!pskb_may_pull(skb, skb->len))
983 goto out_clear_request;
984
985 /*
986 * Find a listener for the particular address/cud pair.
987 */
988 sk = x25_find_listener(&source_addr,skb);
989 skb_push(skb,len);
990
991 if (sk != NULL && sk_acceptq_is_full(sk)) {
992 goto out_sock_put;
993 }
994
995 /*
996 * We dont have any listeners for this incoming call.
997 * Try forwarding it.
998 */
999 if (sk == NULL) {
1000 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1001 if (sysctl_x25_forward &&
1002 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1003 {
1004 /* Call was forwarded, dont process it any more */
1005 kfree_skb(skb);
1006 rc = 1;
1007 goto out;
1008 } else {
1009 /* No listeners, can't forward, clear the call */
1010 goto out_clear_request;
1011 }
1012 }
1013
1014 /*
1015 * Try to reach a compromise on the requested facilities.
1016 */
1017 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1018 if (len == -1)
1019 goto out_sock_put;
1020
1021 /*
1022 * current neighbour/link might impose additional limits
1023 * on certain facilties
1024 */
1025
1026 x25_limit_facilities(&facilities, nb);
1027
1028 /*
1029 * Try to create a new socket.
1030 */
1031 make = x25_make_new(sk);
1032 if (!make)
1033 goto out_sock_put;
1034
1035 /*
1036 * Remove the facilities
1037 */
1038 skb_pull(skb, len);
1039
1040 skb->sk = make;
1041 make->sk_state = TCP_ESTABLISHED;
1042
1043 makex25 = x25_sk(make);
1044 makex25->lci = lci;
1045 makex25->dest_addr = dest_addr;
1046 makex25->source_addr = source_addr;
1047 makex25->neighbour = nb;
1048 makex25->facilities = facilities;
1049 makex25->dte_facilities= dte_facilities;
1050 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1051 /* ensure no reverse facil on accept */
1052 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1053 /* ensure no calling address extension on accept */
1054 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1055 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1056
1057 /* Normally all calls are accepted immediately */
1058 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1059 x25_write_internal(make, X25_CALL_ACCEPTED);
1060 makex25->state = X25_STATE_3;
1061 }
1062
1063 /*
1064 * Incoming Call User Data.
1065 */
1066 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1067 makex25->calluserdata.cudlength = skb->len;
1068
1069 sk->sk_ack_backlog++;
1070
1071 x25_insert_socket(make);
1072
1073 skb_queue_head(&sk->sk_receive_queue, skb);
1074
1075 x25_start_heartbeat(make);
1076
1077 if (!sock_flag(sk, SOCK_DEAD))
1078 sk->sk_data_ready(sk);
1079 rc = 1;
1080 sock_put(sk);
1081 out:
1082 return rc;
1083 out_sock_put:
1084 sock_put(sk);
1085 out_clear_request:
1086 rc = 0;
1087 x25_transmit_clear_request(nb, lci, 0x01);
1088 goto out;
1089 }
1090
x25_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)1091 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1092 {
1093 struct sock *sk = sock->sk;
1094 struct x25_sock *x25 = x25_sk(sk);
1095 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1096 struct sockaddr_x25 sx25;
1097 struct sk_buff *skb;
1098 unsigned char *asmptr;
1099 int noblock = msg->msg_flags & MSG_DONTWAIT;
1100 size_t size;
1101 int qbit = 0, rc = -EINVAL;
1102
1103 lock_sock(sk);
1104 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1105 goto out;
1106
1107 /* we currently don't support segmented records at the user interface */
1108 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1109 goto out;
1110
1111 rc = -EADDRNOTAVAIL;
1112 if (sock_flag(sk, SOCK_ZAPPED))
1113 goto out;
1114
1115 rc = -EPIPE;
1116 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1117 send_sig(SIGPIPE, current, 0);
1118 goto out;
1119 }
1120
1121 rc = -ENETUNREACH;
1122 if (!x25->neighbour)
1123 goto out;
1124
1125 if (usx25) {
1126 rc = -EINVAL;
1127 if (msg->msg_namelen < sizeof(sx25))
1128 goto out;
1129 memcpy(&sx25, usx25, sizeof(sx25));
1130 rc = -EISCONN;
1131 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1132 goto out;
1133 rc = -EINVAL;
1134 if (sx25.sx25_family != AF_X25)
1135 goto out;
1136 } else {
1137 /*
1138 * FIXME 1003.1g - if the socket is like this because
1139 * it has become closed (not started closed) we ought
1140 * to SIGPIPE, EPIPE;
1141 */
1142 rc = -ENOTCONN;
1143 if (sk->sk_state != TCP_ESTABLISHED)
1144 goto out;
1145
1146 sx25.sx25_family = AF_X25;
1147 sx25.sx25_addr = x25->dest_addr;
1148 }
1149
1150 /* Sanity check the packet size */
1151 if (len > 65535) {
1152 rc = -EMSGSIZE;
1153 goto out;
1154 }
1155
1156 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1157
1158 /* Build a packet */
1159 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1160
1161 if ((msg->msg_flags & MSG_OOB) && len > 32)
1162 len = 32;
1163
1164 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1165
1166 release_sock(sk);
1167 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1168 lock_sock(sk);
1169 if (!skb)
1170 goto out;
1171 X25_SKB_CB(skb)->flags = msg->msg_flags;
1172
1173 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1174
1175 /*
1176 * Put the data on the end
1177 */
1178 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1179
1180 skb_reset_transport_header(skb);
1181 skb_put(skb, len);
1182
1183 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1184 if (rc)
1185 goto out_kfree_skb;
1186
1187 /*
1188 * If the Q BIT Include socket option is in force, the first
1189 * byte of the user data is the logical value of the Q Bit.
1190 */
1191 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1192 if (!pskb_may_pull(skb, 1))
1193 goto out_kfree_skb;
1194
1195 qbit = skb->data[0];
1196 skb_pull(skb, 1);
1197 }
1198
1199 /*
1200 * Push down the X.25 header
1201 */
1202 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1203
1204 if (msg->msg_flags & MSG_OOB) {
1205 if (x25->neighbour->extended) {
1206 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1207 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1208 *asmptr++ = (x25->lci >> 0) & 0xFF;
1209 *asmptr++ = X25_INTERRUPT;
1210 } else {
1211 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1212 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1213 *asmptr++ = (x25->lci >> 0) & 0xFF;
1214 *asmptr++ = X25_INTERRUPT;
1215 }
1216 } else {
1217 if (x25->neighbour->extended) {
1218 /* Build an Extended X.25 header */
1219 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1220 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1221 *asmptr++ = (x25->lci >> 0) & 0xFF;
1222 *asmptr++ = X25_DATA;
1223 *asmptr++ = X25_DATA;
1224 } else {
1225 /* Build an Standard X.25 header */
1226 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1227 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1228 *asmptr++ = (x25->lci >> 0) & 0xFF;
1229 *asmptr++ = X25_DATA;
1230 }
1231
1232 if (qbit)
1233 skb->data[0] |= X25_Q_BIT;
1234 }
1235
1236 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1237 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1238
1239 rc = -ENOTCONN;
1240 if (sk->sk_state != TCP_ESTABLISHED)
1241 goto out_kfree_skb;
1242
1243 if (msg->msg_flags & MSG_OOB)
1244 skb_queue_tail(&x25->interrupt_out_queue, skb);
1245 else {
1246 rc = x25_output(sk, skb);
1247 len = rc;
1248 if (rc < 0)
1249 kfree_skb(skb);
1250 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1251 len++;
1252 }
1253
1254 x25_kick(sk);
1255 rc = len;
1256 out:
1257 release_sock(sk);
1258 return rc;
1259 out_kfree_skb:
1260 kfree_skb(skb);
1261 goto out;
1262 }
1263
1264
x25_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)1265 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1266 int flags)
1267 {
1268 struct sock *sk = sock->sk;
1269 struct x25_sock *x25 = x25_sk(sk);
1270 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1271 size_t copied;
1272 int qbit, header_len;
1273 struct sk_buff *skb;
1274 unsigned char *asmptr;
1275 int rc = -ENOTCONN;
1276
1277 lock_sock(sk);
1278
1279 if (x25->neighbour == NULL)
1280 goto out;
1281
1282 header_len = x25->neighbour->extended ?
1283 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1284
1285 /*
1286 * This works for seqpacket too. The receiver has ordered the queue for
1287 * us! We do one quick check first though
1288 */
1289 if (sk->sk_state != TCP_ESTABLISHED)
1290 goto out;
1291
1292 if (flags & MSG_OOB) {
1293 rc = -EINVAL;
1294 if (sock_flag(sk, SOCK_URGINLINE) ||
1295 !skb_peek(&x25->interrupt_in_queue))
1296 goto out;
1297
1298 skb = skb_dequeue(&x25->interrupt_in_queue);
1299
1300 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1301 goto out_free_dgram;
1302
1303 skb_pull(skb, X25_STD_MIN_LEN);
1304
1305 /*
1306 * No Q bit information on Interrupt data.
1307 */
1308 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1309 asmptr = skb_push(skb, 1);
1310 *asmptr = 0x00;
1311 }
1312
1313 msg->msg_flags |= MSG_OOB;
1314 } else {
1315 /* Now we can treat all alike */
1316 release_sock(sk);
1317 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1318 flags & MSG_DONTWAIT, &rc);
1319 lock_sock(sk);
1320 if (!skb)
1321 goto out;
1322
1323 if (!pskb_may_pull(skb, header_len))
1324 goto out_free_dgram;
1325
1326 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1327
1328 skb_pull(skb, header_len);
1329
1330 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1331 asmptr = skb_push(skb, 1);
1332 *asmptr = qbit;
1333 }
1334 }
1335
1336 skb_reset_transport_header(skb);
1337 copied = skb->len;
1338
1339 if (copied > size) {
1340 copied = size;
1341 msg->msg_flags |= MSG_TRUNC;
1342 }
1343
1344 /* Currently, each datagram always contains a complete record */
1345 msg->msg_flags |= MSG_EOR;
1346
1347 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1348 if (rc)
1349 goto out_free_dgram;
1350
1351 if (sx25) {
1352 sx25->sx25_family = AF_X25;
1353 sx25->sx25_addr = x25->dest_addr;
1354 msg->msg_namelen = sizeof(*sx25);
1355 }
1356
1357 x25_check_rbuf(sk);
1358 rc = copied;
1359 out_free_dgram:
1360 skb_free_datagram(sk, skb);
1361 out:
1362 release_sock(sk);
1363 return rc;
1364 }
1365
1366
x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1367 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1368 {
1369 struct sock *sk = sock->sk;
1370 struct x25_sock *x25 = x25_sk(sk);
1371 void __user *argp = (void __user *)arg;
1372 int rc;
1373
1374 switch (cmd) {
1375 case TIOCOUTQ: {
1376 int amount;
1377
1378 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1379 if (amount < 0)
1380 amount = 0;
1381 rc = put_user(amount, (unsigned int __user *)argp);
1382 break;
1383 }
1384
1385 case TIOCINQ: {
1386 struct sk_buff *skb;
1387 int amount = 0;
1388 /*
1389 * These two are safe on a single CPU system as
1390 * only user tasks fiddle here
1391 */
1392 lock_sock(sk);
1393 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1394 amount = skb->len;
1395 release_sock(sk);
1396 rc = put_user(amount, (unsigned int __user *)argp);
1397 break;
1398 }
1399
1400 case SIOCGIFADDR:
1401 case SIOCSIFADDR:
1402 case SIOCGIFDSTADDR:
1403 case SIOCSIFDSTADDR:
1404 case SIOCGIFBRDADDR:
1405 case SIOCSIFBRDADDR:
1406 case SIOCGIFNETMASK:
1407 case SIOCSIFNETMASK:
1408 case SIOCGIFMETRIC:
1409 case SIOCSIFMETRIC:
1410 rc = -EINVAL;
1411 break;
1412 case SIOCADDRT:
1413 case SIOCDELRT:
1414 rc = -EPERM;
1415 if (!capable(CAP_NET_ADMIN))
1416 break;
1417 rc = x25_route_ioctl(cmd, argp);
1418 break;
1419 case SIOCX25GSUBSCRIP:
1420 rc = x25_subscr_ioctl(cmd, argp);
1421 break;
1422 case SIOCX25SSUBSCRIP:
1423 rc = -EPERM;
1424 if (!capable(CAP_NET_ADMIN))
1425 break;
1426 rc = x25_subscr_ioctl(cmd, argp);
1427 break;
1428 case SIOCX25GFACILITIES: {
1429 lock_sock(sk);
1430 rc = copy_to_user(argp, &x25->facilities,
1431 sizeof(x25->facilities))
1432 ? -EFAULT : 0;
1433 release_sock(sk);
1434 break;
1435 }
1436
1437 case SIOCX25SFACILITIES: {
1438 struct x25_facilities facilities;
1439 rc = -EFAULT;
1440 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1441 break;
1442 rc = -EINVAL;
1443 lock_sock(sk);
1444 if (sk->sk_state != TCP_LISTEN &&
1445 sk->sk_state != TCP_CLOSE)
1446 goto out_fac_release;
1447 if (facilities.pacsize_in < X25_PS16 ||
1448 facilities.pacsize_in > X25_PS4096)
1449 goto out_fac_release;
1450 if (facilities.pacsize_out < X25_PS16 ||
1451 facilities.pacsize_out > X25_PS4096)
1452 goto out_fac_release;
1453 if (facilities.winsize_in < 1 ||
1454 facilities.winsize_in > 127)
1455 goto out_fac_release;
1456 if (facilities.throughput) {
1457 int out = facilities.throughput & 0xf0;
1458 int in = facilities.throughput & 0x0f;
1459 if (!out)
1460 facilities.throughput |=
1461 X25_DEFAULT_THROUGHPUT << 4;
1462 else if (out < 0x30 || out > 0xD0)
1463 goto out_fac_release;
1464 if (!in)
1465 facilities.throughput |=
1466 X25_DEFAULT_THROUGHPUT;
1467 else if (in < 0x03 || in > 0x0D)
1468 goto out_fac_release;
1469 }
1470 if (facilities.reverse &&
1471 (facilities.reverse & 0x81) != 0x81)
1472 goto out_fac_release;
1473 x25->facilities = facilities;
1474 rc = 0;
1475 out_fac_release:
1476 release_sock(sk);
1477 break;
1478 }
1479
1480 case SIOCX25GDTEFACILITIES: {
1481 lock_sock(sk);
1482 rc = copy_to_user(argp, &x25->dte_facilities,
1483 sizeof(x25->dte_facilities));
1484 release_sock(sk);
1485 if (rc)
1486 rc = -EFAULT;
1487 break;
1488 }
1489
1490 case SIOCX25SDTEFACILITIES: {
1491 struct x25_dte_facilities dtefacs;
1492 rc = -EFAULT;
1493 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1494 break;
1495 rc = -EINVAL;
1496 lock_sock(sk);
1497 if (sk->sk_state != TCP_LISTEN &&
1498 sk->sk_state != TCP_CLOSE)
1499 goto out_dtefac_release;
1500 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1501 goto out_dtefac_release;
1502 if (dtefacs.called_len > X25_MAX_AE_LEN)
1503 goto out_dtefac_release;
1504 x25->dte_facilities = dtefacs;
1505 rc = 0;
1506 out_dtefac_release:
1507 release_sock(sk);
1508 break;
1509 }
1510
1511 case SIOCX25GCALLUSERDATA: {
1512 lock_sock(sk);
1513 rc = copy_to_user(argp, &x25->calluserdata,
1514 sizeof(x25->calluserdata))
1515 ? -EFAULT : 0;
1516 release_sock(sk);
1517 break;
1518 }
1519
1520 case SIOCX25SCALLUSERDATA: {
1521 struct x25_calluserdata calluserdata;
1522
1523 rc = -EFAULT;
1524 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1525 break;
1526 rc = -EINVAL;
1527 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1528 break;
1529 lock_sock(sk);
1530 x25->calluserdata = calluserdata;
1531 release_sock(sk);
1532 rc = 0;
1533 break;
1534 }
1535
1536 case SIOCX25GCAUSEDIAG: {
1537 lock_sock(sk);
1538 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1539 ? -EFAULT : 0;
1540 release_sock(sk);
1541 break;
1542 }
1543
1544 case SIOCX25SCAUSEDIAG: {
1545 struct x25_causediag causediag;
1546 rc = -EFAULT;
1547 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1548 break;
1549 lock_sock(sk);
1550 x25->causediag = causediag;
1551 release_sock(sk);
1552 rc = 0;
1553 break;
1554
1555 }
1556
1557 case SIOCX25SCUDMATCHLEN: {
1558 struct x25_subaddr sub_addr;
1559 rc = -EINVAL;
1560 lock_sock(sk);
1561 if(sk->sk_state != TCP_CLOSE)
1562 goto out_cud_release;
1563 rc = -EFAULT;
1564 if (copy_from_user(&sub_addr, argp,
1565 sizeof(sub_addr)))
1566 goto out_cud_release;
1567 rc = -EINVAL;
1568 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1569 goto out_cud_release;
1570 x25->cudmatchlength = sub_addr.cudmatchlength;
1571 rc = 0;
1572 out_cud_release:
1573 release_sock(sk);
1574 break;
1575 }
1576
1577 case SIOCX25CALLACCPTAPPRV: {
1578 rc = -EINVAL;
1579 lock_sock(sk);
1580 if (sk->sk_state == TCP_CLOSE) {
1581 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1582 rc = 0;
1583 }
1584 release_sock(sk);
1585 break;
1586 }
1587
1588 case SIOCX25SENDCALLACCPT: {
1589 rc = -EINVAL;
1590 lock_sock(sk);
1591 if (sk->sk_state != TCP_ESTABLISHED)
1592 goto out_sendcallaccpt_release;
1593 /* must call accptapprv above */
1594 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1595 goto out_sendcallaccpt_release;
1596 x25_write_internal(sk, X25_CALL_ACCEPTED);
1597 x25->state = X25_STATE_3;
1598 rc = 0;
1599 out_sendcallaccpt_release:
1600 release_sock(sk);
1601 break;
1602 }
1603
1604 default:
1605 rc = -ENOIOCTLCMD;
1606 break;
1607 }
1608
1609 return rc;
1610 }
1611
1612 static const struct net_proto_family x25_family_ops = {
1613 .family = AF_X25,
1614 .create = x25_create,
1615 .owner = THIS_MODULE,
1616 };
1617
1618 #ifdef CONFIG_COMPAT
compat_x25_subscr_ioctl(unsigned int cmd,struct compat_x25_subscrip_struct __user * x25_subscr32)1619 static int compat_x25_subscr_ioctl(unsigned int cmd,
1620 struct compat_x25_subscrip_struct __user *x25_subscr32)
1621 {
1622 struct compat_x25_subscrip_struct x25_subscr;
1623 struct x25_neigh *nb;
1624 struct net_device *dev;
1625 int rc = -EINVAL;
1626
1627 rc = -EFAULT;
1628 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1629 goto out;
1630
1631 rc = -EINVAL;
1632 dev = x25_dev_get(x25_subscr.device);
1633 if (dev == NULL)
1634 goto out;
1635
1636 nb = x25_get_neigh(dev);
1637 if (nb == NULL)
1638 goto out_dev_put;
1639
1640 dev_put(dev);
1641
1642 if (cmd == SIOCX25GSUBSCRIP) {
1643 read_lock_bh(&x25_neigh_list_lock);
1644 x25_subscr.extended = nb->extended;
1645 x25_subscr.global_facil_mask = nb->global_facil_mask;
1646 read_unlock_bh(&x25_neigh_list_lock);
1647 rc = copy_to_user(x25_subscr32, &x25_subscr,
1648 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1649 } else {
1650 rc = -EINVAL;
1651 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1652 rc = 0;
1653 write_lock_bh(&x25_neigh_list_lock);
1654 nb->extended = x25_subscr.extended;
1655 nb->global_facil_mask = x25_subscr.global_facil_mask;
1656 write_unlock_bh(&x25_neigh_list_lock);
1657 }
1658 }
1659 x25_neigh_put(nb);
1660 out:
1661 return rc;
1662 out_dev_put:
1663 dev_put(dev);
1664 goto out;
1665 }
1666
compat_x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1667 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1668 unsigned long arg)
1669 {
1670 void __user *argp = compat_ptr(arg);
1671 int rc = -ENOIOCTLCMD;
1672
1673 switch(cmd) {
1674 case TIOCOUTQ:
1675 case TIOCINQ:
1676 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1677 break;
1678 case SIOCGIFADDR:
1679 case SIOCSIFADDR:
1680 case SIOCGIFDSTADDR:
1681 case SIOCSIFDSTADDR:
1682 case SIOCGIFBRDADDR:
1683 case SIOCSIFBRDADDR:
1684 case SIOCGIFNETMASK:
1685 case SIOCSIFNETMASK:
1686 case SIOCGIFMETRIC:
1687 case SIOCSIFMETRIC:
1688 rc = -EINVAL;
1689 break;
1690 case SIOCADDRT:
1691 case SIOCDELRT:
1692 rc = -EPERM;
1693 if (!capable(CAP_NET_ADMIN))
1694 break;
1695 rc = x25_route_ioctl(cmd, argp);
1696 break;
1697 case SIOCX25GSUBSCRIP:
1698 rc = compat_x25_subscr_ioctl(cmd, argp);
1699 break;
1700 case SIOCX25SSUBSCRIP:
1701 rc = -EPERM;
1702 if (!capable(CAP_NET_ADMIN))
1703 break;
1704 rc = compat_x25_subscr_ioctl(cmd, argp);
1705 break;
1706 case SIOCX25GFACILITIES:
1707 case SIOCX25SFACILITIES:
1708 case SIOCX25GDTEFACILITIES:
1709 case SIOCX25SDTEFACILITIES:
1710 case SIOCX25GCALLUSERDATA:
1711 case SIOCX25SCALLUSERDATA:
1712 case SIOCX25GCAUSEDIAG:
1713 case SIOCX25SCAUSEDIAG:
1714 case SIOCX25SCUDMATCHLEN:
1715 case SIOCX25CALLACCPTAPPRV:
1716 case SIOCX25SENDCALLACCPT:
1717 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1718 break;
1719 default:
1720 rc = -ENOIOCTLCMD;
1721 break;
1722 }
1723 return rc;
1724 }
1725 #endif
1726
1727 static const struct proto_ops x25_proto_ops = {
1728 .family = AF_X25,
1729 .owner = THIS_MODULE,
1730 .release = x25_release,
1731 .bind = x25_bind,
1732 .connect = x25_connect,
1733 .socketpair = sock_no_socketpair,
1734 .accept = x25_accept,
1735 .getname = x25_getname,
1736 .poll = datagram_poll,
1737 .ioctl = x25_ioctl,
1738 #ifdef CONFIG_COMPAT
1739 .compat_ioctl = compat_x25_ioctl,
1740 #endif
1741 .gettstamp = sock_gettstamp,
1742 .listen = x25_listen,
1743 .shutdown = sock_no_shutdown,
1744 .setsockopt = x25_setsockopt,
1745 .getsockopt = x25_getsockopt,
1746 .sendmsg = x25_sendmsg,
1747 .recvmsg = x25_recvmsg,
1748 .mmap = sock_no_mmap,
1749 .sendpage = sock_no_sendpage,
1750 };
1751
1752 static struct packet_type x25_packet_type __read_mostly = {
1753 .type = cpu_to_be16(ETH_P_X25),
1754 .func = x25_lapb_receive_frame,
1755 };
1756
1757 static struct notifier_block x25_dev_notifier = {
1758 .notifier_call = x25_device_event,
1759 };
1760
x25_kill_by_neigh(struct x25_neigh * nb)1761 void x25_kill_by_neigh(struct x25_neigh *nb)
1762 {
1763 struct sock *s;
1764
1765 write_lock_bh(&x25_list_lock);
1766
1767 sk_for_each(s, &x25_list)
1768 if (x25_sk(s)->neighbour == nb)
1769 x25_disconnect(s, ENETUNREACH, 0, 0);
1770
1771 write_unlock_bh(&x25_list_lock);
1772
1773 /* Remove any related forwards */
1774 x25_clear_forward_by_dev(nb->dev);
1775 }
1776
x25_init(void)1777 static int __init x25_init(void)
1778 {
1779 int rc;
1780
1781 rc = proto_register(&x25_proto, 0);
1782 if (rc)
1783 goto out;
1784
1785 rc = sock_register(&x25_family_ops);
1786 if (rc)
1787 goto out_proto;
1788
1789 dev_add_pack(&x25_packet_type);
1790
1791 rc = register_netdevice_notifier(&x25_dev_notifier);
1792 if (rc)
1793 goto out_sock;
1794
1795 rc = x25_register_sysctl();
1796 if (rc)
1797 goto out_dev;
1798
1799 rc = x25_proc_init();
1800 if (rc)
1801 goto out_sysctl;
1802
1803 pr_info("Linux Version 0.2\n");
1804
1805 out:
1806 return rc;
1807 out_sysctl:
1808 x25_unregister_sysctl();
1809 out_dev:
1810 unregister_netdevice_notifier(&x25_dev_notifier);
1811 out_sock:
1812 dev_remove_pack(&x25_packet_type);
1813 sock_unregister(AF_X25);
1814 out_proto:
1815 proto_unregister(&x25_proto);
1816 goto out;
1817 }
1818 module_init(x25_init);
1819
x25_exit(void)1820 static void __exit x25_exit(void)
1821 {
1822 x25_proc_exit();
1823 x25_link_free();
1824 x25_route_free();
1825
1826 x25_unregister_sysctl();
1827
1828 unregister_netdevice_notifier(&x25_dev_notifier);
1829
1830 dev_remove_pack(&x25_packet_type);
1831
1832 sock_unregister(AF_X25);
1833 proto_unregister(&x25_proto);
1834 }
1835 module_exit(x25_exit);
1836
1837 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1838 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1839 MODULE_LICENSE("GPL");
1840 MODULE_ALIAS_NETPROTO(PF_X25);
1841