1 /*
2 * X.25 Packet Layer release 002
3 *
4 * This is ALPHA test software. This code may break your machine,
5 * randomly fail to work with new releases, misbehave and/or generally
6 * screw up. It might even work.
7 *
8 * This code REQUIRES 2.1.15 or higher
9 *
10 * This module:
11 * This module is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 *
16 * History
17 * X.25 001 Jonathan Naylor Started coding.
18 * X.25 002 Jonathan Naylor Centralised disconnect handling.
19 * New timer architecture.
20 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant.
21 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of
22 * facilities negotiation and increased
23 * the throughput upper limit.
24 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups
25 * 2000-09-04 Henner Eisen Set sock->state in x25_accept().
26 * Fixed x25_output() related skb leakage.
27 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket.
28 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation.
29 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN
30 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
31 * x25_proc.c, using seq_file
32 * 2005-04-02 Shaun Pereira Selective sub address matching
33 * with call user data
34 * 2005-04-15 Shaun Pereira Fast select with no restriction on
35 * response
36 */
37
38 #define pr_fmt(fmt) "X25: " fmt
39
40 #include <linux/module.h>
41 #include <linux/capability.h>
42 #include <linux/errno.h>
43 #include <linux/kernel.h>
44 #include <linux/sched/signal.h>
45 #include <linux/timer.h>
46 #include <linux/string.h>
47 #include <linux/net.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_arp.h>
50 #include <linux/skbuff.h>
51 #include <linux/slab.h>
52 #include <net/sock.h>
53 #include <net/tcp_states.h>
54 #include <linux/uaccess.h>
55 #include <linux/fcntl.h>
56 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
57 #include <linux/notifier.h>
58 #include <linux/init.h>
59 #include <linux/compat.h>
60 #include <linux/ctype.h>
61
62 #include <net/x25.h>
63 #include <net/compat.h>
64
65 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
66 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
67 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
68 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
69 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
70 int sysctl_x25_forward = 0;
71
72 HLIST_HEAD(x25_list);
73 DEFINE_RWLOCK(x25_list_lock);
74
75 static const struct proto_ops x25_proto_ops;
76
77 static const struct x25_address null_x25_address = {" "};
78
79 #ifdef CONFIG_COMPAT
80 struct compat_x25_subscrip_struct {
81 char device[200-sizeof(compat_ulong_t)];
82 compat_ulong_t global_facil_mask;
83 compat_uint_t extended;
84 };
85 #endif
86
87
x25_parse_address_block(struct sk_buff * skb,struct x25_address * called_addr,struct x25_address * calling_addr)88 int x25_parse_address_block(struct sk_buff *skb,
89 struct x25_address *called_addr,
90 struct x25_address *calling_addr)
91 {
92 unsigned char len;
93 int needed;
94 int rc;
95
96 if (!pskb_may_pull(skb, 1)) {
97 /* packet has no address block */
98 rc = 0;
99 goto empty;
100 }
101
102 len = *skb->data;
103 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
104
105 if (!pskb_may_pull(skb, needed)) {
106 /* packet is too short to hold the addresses it claims
107 to hold */
108 rc = -1;
109 goto empty;
110 }
111
112 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
113
114 empty:
115 *called_addr->x25_addr = 0;
116 *calling_addr->x25_addr = 0;
117
118 return rc;
119 }
120
121
x25_addr_ntoa(unsigned char * p,struct x25_address * called_addr,struct x25_address * calling_addr)122 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
123 struct x25_address *calling_addr)
124 {
125 unsigned int called_len, calling_len;
126 char *called, *calling;
127 unsigned int i;
128
129 called_len = (*p >> 0) & 0x0F;
130 calling_len = (*p >> 4) & 0x0F;
131
132 called = called_addr->x25_addr;
133 calling = calling_addr->x25_addr;
134 p++;
135
136 for (i = 0; i < (called_len + calling_len); i++) {
137 if (i < called_len) {
138 if (i % 2 != 0) {
139 *called++ = ((*p >> 0) & 0x0F) + '0';
140 p++;
141 } else {
142 *called++ = ((*p >> 4) & 0x0F) + '0';
143 }
144 } else {
145 if (i % 2 != 0) {
146 *calling++ = ((*p >> 0) & 0x0F) + '0';
147 p++;
148 } else {
149 *calling++ = ((*p >> 4) & 0x0F) + '0';
150 }
151 }
152 }
153
154 *called = *calling = '\0';
155
156 return 1 + (called_len + calling_len + 1) / 2;
157 }
158
x25_addr_aton(unsigned char * p,struct x25_address * called_addr,struct x25_address * calling_addr)159 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
160 struct x25_address *calling_addr)
161 {
162 unsigned int called_len, calling_len;
163 char *called, *calling;
164 int i;
165
166 called = called_addr->x25_addr;
167 calling = calling_addr->x25_addr;
168
169 called_len = strlen(called);
170 calling_len = strlen(calling);
171
172 *p++ = (calling_len << 4) | (called_len << 0);
173
174 for (i = 0; i < (called_len + calling_len); i++) {
175 if (i < called_len) {
176 if (i % 2 != 0) {
177 *p |= (*called++ - '0') << 0;
178 p++;
179 } else {
180 *p = 0x00;
181 *p |= (*called++ - '0') << 4;
182 }
183 } else {
184 if (i % 2 != 0) {
185 *p |= (*calling++ - '0') << 0;
186 p++;
187 } else {
188 *p = 0x00;
189 *p |= (*calling++ - '0') << 4;
190 }
191 }
192 }
193
194 return 1 + (called_len + calling_len + 1) / 2;
195 }
196
197 /*
198 * Socket removal during an interrupt is now safe.
199 */
x25_remove_socket(struct sock * sk)200 static void x25_remove_socket(struct sock *sk)
201 {
202 write_lock_bh(&x25_list_lock);
203 sk_del_node_init(sk);
204 write_unlock_bh(&x25_list_lock);
205 }
206
207 /*
208 * Kill all bound sockets on a dropped device.
209 */
x25_kill_by_device(struct net_device * dev)210 static void x25_kill_by_device(struct net_device *dev)
211 {
212 struct sock *s;
213
214 write_lock_bh(&x25_list_lock);
215
216 sk_for_each(s, &x25_list)
217 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
218 x25_disconnect(s, ENETUNREACH, 0, 0);
219
220 write_unlock_bh(&x25_list_lock);
221 }
222
223 /*
224 * Handle device status changes.
225 */
x25_device_event(struct notifier_block * this,unsigned long event,void * ptr)226 static int x25_device_event(struct notifier_block *this, unsigned long event,
227 void *ptr)
228 {
229 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
230 struct x25_neigh *nb;
231
232 if (!net_eq(dev_net(dev), &init_net))
233 return NOTIFY_DONE;
234
235 if (dev->type == ARPHRD_X25
236 #if IS_ENABLED(CONFIG_LLC)
237 || dev->type == ARPHRD_ETHER
238 #endif
239 ) {
240 switch (event) {
241 case NETDEV_UP:
242 x25_link_device_up(dev);
243 break;
244 case NETDEV_GOING_DOWN:
245 nb = x25_get_neigh(dev);
246 if (nb) {
247 x25_terminate_link(nb);
248 x25_neigh_put(nb);
249 }
250 break;
251 case NETDEV_DOWN:
252 x25_kill_by_device(dev);
253 x25_route_device_down(dev);
254 x25_link_device_down(dev);
255 break;
256 }
257 }
258
259 return NOTIFY_DONE;
260 }
261
262 /*
263 * Add a socket to the bound sockets list.
264 */
x25_insert_socket(struct sock * sk)265 static void x25_insert_socket(struct sock *sk)
266 {
267 write_lock_bh(&x25_list_lock);
268 sk_add_node(sk, &x25_list);
269 write_unlock_bh(&x25_list_lock);
270 }
271
272 /*
273 * Find a socket that wants to accept the Call Request we just
274 * received. Check the full list for an address/cud match.
275 * If no cuds match return the next_best thing, an address match.
276 * Note: if a listening socket has cud set it must only get calls
277 * with matching cud.
278 */
x25_find_listener(struct x25_address * addr,struct sk_buff * skb)279 static struct sock *x25_find_listener(struct x25_address *addr,
280 struct sk_buff *skb)
281 {
282 struct sock *s;
283 struct sock *next_best;
284
285 read_lock_bh(&x25_list_lock);
286 next_best = NULL;
287
288 sk_for_each(s, &x25_list)
289 if ((!strcmp(addr->x25_addr,
290 x25_sk(s)->source_addr.x25_addr) ||
291 !strcmp(x25_sk(s)->source_addr.x25_addr,
292 null_x25_address.x25_addr)) &&
293 s->sk_state == TCP_LISTEN) {
294 /*
295 * Found a listening socket, now check the incoming
296 * call user data vs this sockets call user data
297 */
298 if (x25_sk(s)->cudmatchlength > 0 &&
299 skb->len >= x25_sk(s)->cudmatchlength) {
300 if((memcmp(x25_sk(s)->calluserdata.cuddata,
301 skb->data,
302 x25_sk(s)->cudmatchlength)) == 0) {
303 sock_hold(s);
304 goto found;
305 }
306 } else
307 next_best = s;
308 }
309 if (next_best) {
310 s = next_best;
311 sock_hold(s);
312 goto found;
313 }
314 s = NULL;
315 found:
316 read_unlock_bh(&x25_list_lock);
317 return s;
318 }
319
320 /*
321 * Find a connected X.25 socket given my LCI and neighbour.
322 */
__x25_find_socket(unsigned int lci,struct x25_neigh * nb)323 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
324 {
325 struct sock *s;
326
327 sk_for_each(s, &x25_list)
328 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
329 sock_hold(s);
330 goto found;
331 }
332 s = NULL;
333 found:
334 return s;
335 }
336
x25_find_socket(unsigned int lci,struct x25_neigh * nb)337 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
338 {
339 struct sock *s;
340
341 read_lock_bh(&x25_list_lock);
342 s = __x25_find_socket(lci, nb);
343 read_unlock_bh(&x25_list_lock);
344 return s;
345 }
346
347 /*
348 * Find a unique LCI for a given device.
349 */
x25_new_lci(struct x25_neigh * nb)350 static unsigned int x25_new_lci(struct x25_neigh *nb)
351 {
352 unsigned int lci = 1;
353 struct sock *sk;
354
355 while ((sk = x25_find_socket(lci, nb)) != NULL) {
356 sock_put(sk);
357 if (++lci == 4096) {
358 lci = 0;
359 break;
360 }
361 cond_resched();
362 }
363
364 return lci;
365 }
366
367 /*
368 * Deferred destroy.
369 */
370 static void __x25_destroy_socket(struct sock *);
371
372 /*
373 * handler for deferred kills.
374 */
x25_destroy_timer(unsigned long data)375 static void x25_destroy_timer(unsigned long data)
376 {
377 x25_destroy_socket_from_timer((struct sock *)data);
378 }
379
380 /*
381 * This is called from user mode and the timers. Thus it protects itself
382 * against interrupt users but doesn't worry about being called during
383 * work. Once it is removed from the queue no interrupt or bottom half
384 * will touch it and we are (fairly 8-) ) safe.
385 * Not static as it's used by the timer
386 */
__x25_destroy_socket(struct sock * sk)387 static void __x25_destroy_socket(struct sock *sk)
388 {
389 struct sk_buff *skb;
390
391 x25_stop_heartbeat(sk);
392 x25_stop_timer(sk);
393
394 x25_remove_socket(sk);
395 x25_clear_queues(sk); /* Flush the queues */
396
397 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
398 if (skb->sk != sk) { /* A pending connection */
399 /*
400 * Queue the unaccepted socket for death
401 */
402 skb->sk->sk_state = TCP_LISTEN;
403 sock_set_flag(skb->sk, SOCK_DEAD);
404 x25_start_heartbeat(skb->sk);
405 x25_sk(skb->sk)->state = X25_STATE_0;
406 }
407
408 kfree_skb(skb);
409 }
410
411 if (sk_has_allocations(sk)) {
412 /* Defer: outstanding buffers */
413 sk->sk_timer.expires = jiffies + 10 * HZ;
414 sk->sk_timer.function = x25_destroy_timer;
415 sk->sk_timer.data = (unsigned long)sk;
416 add_timer(&sk->sk_timer);
417 } else {
418 /* drop last reference so sock_put will free */
419 __sock_put(sk);
420 }
421 }
422
x25_destroy_socket_from_timer(struct sock * sk)423 void x25_destroy_socket_from_timer(struct sock *sk)
424 {
425 sock_hold(sk);
426 bh_lock_sock(sk);
427 __x25_destroy_socket(sk);
428 bh_unlock_sock(sk);
429 sock_put(sk);
430 }
431
432 /*
433 * Handling for system calls applied via the various interfaces to a
434 * X.25 socket object.
435 */
436
x25_setsockopt(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)437 static int x25_setsockopt(struct socket *sock, int level, int optname,
438 char __user *optval, unsigned int optlen)
439 {
440 int opt;
441 struct sock *sk = sock->sk;
442 int rc = -ENOPROTOOPT;
443
444 if (level != SOL_X25 || optname != X25_QBITINCL)
445 goto out;
446
447 rc = -EINVAL;
448 if (optlen < sizeof(int))
449 goto out;
450
451 rc = -EFAULT;
452 if (get_user(opt, (int __user *)optval))
453 goto out;
454
455 if (opt)
456 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
457 else
458 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
459 rc = 0;
460 out:
461 return rc;
462 }
463
x25_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)464 static int x25_getsockopt(struct socket *sock, int level, int optname,
465 char __user *optval, int __user *optlen)
466 {
467 struct sock *sk = sock->sk;
468 int val, len, rc = -ENOPROTOOPT;
469
470 if (level != SOL_X25 || optname != X25_QBITINCL)
471 goto out;
472
473 rc = -EFAULT;
474 if (get_user(len, optlen))
475 goto out;
476
477 len = min_t(unsigned int, len, sizeof(int));
478
479 rc = -EINVAL;
480 if (len < 0)
481 goto out;
482
483 rc = -EFAULT;
484 if (put_user(len, optlen))
485 goto out;
486
487 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
488 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
489 out:
490 return rc;
491 }
492
x25_listen(struct socket * sock,int backlog)493 static int x25_listen(struct socket *sock, int backlog)
494 {
495 struct sock *sk = sock->sk;
496 int rc = -EOPNOTSUPP;
497
498 lock_sock(sk);
499 if (sk->sk_state != TCP_LISTEN) {
500 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
501 sk->sk_max_ack_backlog = backlog;
502 sk->sk_state = TCP_LISTEN;
503 rc = 0;
504 }
505 release_sock(sk);
506
507 return rc;
508 }
509
510 static struct proto x25_proto = {
511 .name = "X25",
512 .owner = THIS_MODULE,
513 .obj_size = sizeof(struct x25_sock),
514 };
515
x25_alloc_socket(struct net * net,int kern)516 static struct sock *x25_alloc_socket(struct net *net, int kern)
517 {
518 struct x25_sock *x25;
519 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
520
521 if (!sk)
522 goto out;
523
524 sock_init_data(NULL, sk);
525
526 x25 = x25_sk(sk);
527 skb_queue_head_init(&x25->ack_queue);
528 skb_queue_head_init(&x25->fragment_queue);
529 skb_queue_head_init(&x25->interrupt_in_queue);
530 skb_queue_head_init(&x25->interrupt_out_queue);
531 out:
532 return sk;
533 }
534
x25_create(struct net * net,struct socket * sock,int protocol,int kern)535 static int x25_create(struct net *net, struct socket *sock, int protocol,
536 int kern)
537 {
538 struct sock *sk;
539 struct x25_sock *x25;
540 int rc = -EAFNOSUPPORT;
541
542 if (!net_eq(net, &init_net))
543 goto out;
544
545 rc = -ESOCKTNOSUPPORT;
546 if (sock->type != SOCK_SEQPACKET)
547 goto out;
548
549 rc = -EINVAL;
550 if (protocol)
551 goto out;
552
553 rc = -ENOBUFS;
554 if ((sk = x25_alloc_socket(net, kern)) == NULL)
555 goto out;
556
557 x25 = x25_sk(sk);
558
559 sock_init_data(sock, sk);
560
561 x25_init_timers(sk);
562
563 sock->ops = &x25_proto_ops;
564 sk->sk_protocol = protocol;
565 sk->sk_backlog_rcv = x25_backlog_rcv;
566
567 x25->t21 = sysctl_x25_call_request_timeout;
568 x25->t22 = sysctl_x25_reset_request_timeout;
569 x25->t23 = sysctl_x25_clear_request_timeout;
570 x25->t2 = sysctl_x25_ack_holdback_timeout;
571 x25->state = X25_STATE_0;
572 x25->cudmatchlength = 0;
573 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
574 /* on call accept */
575
576 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
577 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
578 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
579 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
580 x25->facilities.throughput = 0; /* by default don't negotiate
581 throughput */
582 x25->facilities.reverse = X25_DEFAULT_REVERSE;
583 x25->dte_facilities.calling_len = 0;
584 x25->dte_facilities.called_len = 0;
585 memset(x25->dte_facilities.called_ae, '\0',
586 sizeof(x25->dte_facilities.called_ae));
587 memset(x25->dte_facilities.calling_ae, '\0',
588 sizeof(x25->dte_facilities.calling_ae));
589
590 rc = 0;
591 out:
592 return rc;
593 }
594
x25_make_new(struct sock * osk)595 static struct sock *x25_make_new(struct sock *osk)
596 {
597 struct sock *sk = NULL;
598 struct x25_sock *x25, *ox25;
599
600 if (osk->sk_type != SOCK_SEQPACKET)
601 goto out;
602
603 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
604 goto out;
605
606 x25 = x25_sk(sk);
607
608 sk->sk_type = osk->sk_type;
609 sk->sk_priority = osk->sk_priority;
610 sk->sk_protocol = osk->sk_protocol;
611 sk->sk_rcvbuf = osk->sk_rcvbuf;
612 sk->sk_sndbuf = osk->sk_sndbuf;
613 sk->sk_state = TCP_ESTABLISHED;
614 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
615 sock_copy_flags(sk, osk);
616
617 ox25 = x25_sk(osk);
618 x25->t21 = ox25->t21;
619 x25->t22 = ox25->t22;
620 x25->t23 = ox25->t23;
621 x25->t2 = ox25->t2;
622 x25->flags = ox25->flags;
623 x25->facilities = ox25->facilities;
624 x25->dte_facilities = ox25->dte_facilities;
625 x25->cudmatchlength = ox25->cudmatchlength;
626
627 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
628 x25_init_timers(sk);
629 out:
630 return sk;
631 }
632
x25_release(struct socket * sock)633 static int x25_release(struct socket *sock)
634 {
635 struct sock *sk = sock->sk;
636 struct x25_sock *x25;
637
638 if (!sk)
639 return 0;
640
641 x25 = x25_sk(sk);
642
643 sock_hold(sk);
644 lock_sock(sk);
645 switch (x25->state) {
646
647 case X25_STATE_0:
648 case X25_STATE_2:
649 x25_disconnect(sk, 0, 0, 0);
650 __x25_destroy_socket(sk);
651 goto out;
652
653 case X25_STATE_1:
654 case X25_STATE_3:
655 case X25_STATE_4:
656 x25_clear_queues(sk);
657 x25_write_internal(sk, X25_CLEAR_REQUEST);
658 x25_start_t23timer(sk);
659 x25->state = X25_STATE_2;
660 sk->sk_state = TCP_CLOSE;
661 sk->sk_shutdown |= SEND_SHUTDOWN;
662 sk->sk_state_change(sk);
663 sock_set_flag(sk, SOCK_DEAD);
664 sock_set_flag(sk, SOCK_DESTROY);
665 break;
666 }
667
668 sock_orphan(sk);
669 out:
670 release_sock(sk);
671 sock_put(sk);
672 return 0;
673 }
674
x25_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)675 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
676 {
677 struct sock *sk = sock->sk;
678 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
679 int len, i, rc = 0;
680
681 if (addr_len != sizeof(struct sockaddr_x25) ||
682 addr->sx25_family != AF_X25) {
683 rc = -EINVAL;
684 goto out;
685 }
686
687 /* check for the null_x25_address */
688 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
689
690 len = strlen(addr->sx25_addr.x25_addr);
691 for (i = 0; i < len; i++) {
692 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
693 rc = -EINVAL;
694 goto out;
695 }
696 }
697 }
698
699 lock_sock(sk);
700 if (sock_flag(sk, SOCK_ZAPPED)) {
701 x25_sk(sk)->source_addr = addr->sx25_addr;
702 x25_insert_socket(sk);
703 sock_reset_flag(sk, SOCK_ZAPPED);
704 } else {
705 rc = -EINVAL;
706 }
707 release_sock(sk);
708 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
709 out:
710 return rc;
711 }
712
x25_wait_for_connection_establishment(struct sock * sk)713 static int x25_wait_for_connection_establishment(struct sock *sk)
714 {
715 DECLARE_WAITQUEUE(wait, current);
716 int rc;
717
718 add_wait_queue_exclusive(sk_sleep(sk), &wait);
719 for (;;) {
720 __set_current_state(TASK_INTERRUPTIBLE);
721 rc = -ERESTARTSYS;
722 if (signal_pending(current))
723 break;
724 rc = sock_error(sk);
725 if (rc) {
726 sk->sk_socket->state = SS_UNCONNECTED;
727 break;
728 }
729 rc = 0;
730 if (sk->sk_state != TCP_ESTABLISHED) {
731 release_sock(sk);
732 schedule();
733 lock_sock(sk);
734 } else
735 break;
736 }
737 __set_current_state(TASK_RUNNING);
738 remove_wait_queue(sk_sleep(sk), &wait);
739 return rc;
740 }
741
x25_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)742 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
743 int addr_len, int flags)
744 {
745 struct sock *sk = sock->sk;
746 struct x25_sock *x25 = x25_sk(sk);
747 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
748 struct x25_route *rt;
749 int rc = 0;
750
751 lock_sock(sk);
752 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
753 sock->state = SS_CONNECTED;
754 goto out; /* Connect completed during a ERESTARTSYS event */
755 }
756
757 rc = -ECONNREFUSED;
758 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
759 sock->state = SS_UNCONNECTED;
760 goto out;
761 }
762
763 rc = -EISCONN; /* No reconnect on a seqpacket socket */
764 if (sk->sk_state == TCP_ESTABLISHED)
765 goto out;
766
767 rc = -EALREADY; /* Do nothing if call is already in progress */
768 if (sk->sk_state == TCP_SYN_SENT)
769 goto out;
770
771 sk->sk_state = TCP_CLOSE;
772 sock->state = SS_UNCONNECTED;
773
774 rc = -EINVAL;
775 if (addr_len != sizeof(struct sockaddr_x25) ||
776 addr->sx25_family != AF_X25)
777 goto out;
778
779 rc = -ENETUNREACH;
780 rt = x25_get_route(&addr->sx25_addr);
781 if (!rt)
782 goto out;
783
784 x25->neighbour = x25_get_neigh(rt->dev);
785 if (!x25->neighbour)
786 goto out_put_route;
787
788 x25_limit_facilities(&x25->facilities, x25->neighbour);
789
790 x25->lci = x25_new_lci(x25->neighbour);
791 if (!x25->lci)
792 goto out_put_neigh;
793
794 rc = -EINVAL;
795 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
796 goto out_put_neigh;
797
798 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
799 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
800
801 x25->dest_addr = addr->sx25_addr;
802
803 /* Move to connecting socket, start sending Connect Requests */
804 sock->state = SS_CONNECTING;
805 sk->sk_state = TCP_SYN_SENT;
806
807 x25->state = X25_STATE_1;
808
809 x25_write_internal(sk, X25_CALL_REQUEST);
810
811 x25_start_heartbeat(sk);
812 x25_start_t21timer(sk);
813
814 /* Now the loop */
815 rc = -EINPROGRESS;
816 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
817 goto out;
818
819 rc = x25_wait_for_connection_establishment(sk);
820 if (rc)
821 goto out_put_neigh;
822
823 sock->state = SS_CONNECTED;
824 rc = 0;
825 out_put_neigh:
826 if (rc) {
827 read_lock_bh(&x25_list_lock);
828 x25_neigh_put(x25->neighbour);
829 x25->neighbour = NULL;
830 read_unlock_bh(&x25_list_lock);
831 x25->state = X25_STATE_0;
832 }
833 out_put_route:
834 x25_route_put(rt);
835 out:
836 release_sock(sk);
837 return rc;
838 }
839
x25_wait_for_data(struct sock * sk,long timeout)840 static int x25_wait_for_data(struct sock *sk, long timeout)
841 {
842 DECLARE_WAITQUEUE(wait, current);
843 int rc = 0;
844
845 add_wait_queue_exclusive(sk_sleep(sk), &wait);
846 for (;;) {
847 __set_current_state(TASK_INTERRUPTIBLE);
848 if (sk->sk_shutdown & RCV_SHUTDOWN)
849 break;
850 rc = -ERESTARTSYS;
851 if (signal_pending(current))
852 break;
853 rc = -EAGAIN;
854 if (!timeout)
855 break;
856 rc = 0;
857 if (skb_queue_empty(&sk->sk_receive_queue)) {
858 release_sock(sk);
859 timeout = schedule_timeout(timeout);
860 lock_sock(sk);
861 } else
862 break;
863 }
864 __set_current_state(TASK_RUNNING);
865 remove_wait_queue(sk_sleep(sk), &wait);
866 return rc;
867 }
868
x25_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)869 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
870 bool kern)
871 {
872 struct sock *sk = sock->sk;
873 struct sock *newsk;
874 struct sk_buff *skb;
875 int rc = -EINVAL;
876
877 if (!sk)
878 goto out;
879
880 rc = -EOPNOTSUPP;
881 if (sk->sk_type != SOCK_SEQPACKET)
882 goto out;
883
884 lock_sock(sk);
885 rc = -EINVAL;
886 if (sk->sk_state != TCP_LISTEN)
887 goto out2;
888
889 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
890 if (rc)
891 goto out2;
892 skb = skb_dequeue(&sk->sk_receive_queue);
893 rc = -EINVAL;
894 if (!skb->sk)
895 goto out2;
896 newsk = skb->sk;
897 sock_graft(newsk, newsock);
898
899 /* Now attach up the new socket */
900 skb->sk = NULL;
901 kfree_skb(skb);
902 sk->sk_ack_backlog--;
903 newsock->state = SS_CONNECTED;
904 rc = 0;
905 out2:
906 release_sock(sk);
907 out:
908 return rc;
909 }
910
x25_getname(struct socket * sock,struct sockaddr * uaddr,int * uaddr_len,int peer)911 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
912 int *uaddr_len, int peer)
913 {
914 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
915 struct sock *sk = sock->sk;
916 struct x25_sock *x25 = x25_sk(sk);
917 int rc = 0;
918
919 if (peer) {
920 if (sk->sk_state != TCP_ESTABLISHED) {
921 rc = -ENOTCONN;
922 goto out;
923 }
924 sx25->sx25_addr = x25->dest_addr;
925 } else
926 sx25->sx25_addr = x25->source_addr;
927
928 sx25->sx25_family = AF_X25;
929 *uaddr_len = sizeof(*sx25);
930
931 out:
932 return rc;
933 }
934
x25_rx_call_request(struct sk_buff * skb,struct x25_neigh * nb,unsigned int lci)935 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
936 unsigned int lci)
937 {
938 struct sock *sk;
939 struct sock *make;
940 struct x25_sock *makex25;
941 struct x25_address source_addr, dest_addr;
942 struct x25_facilities facilities;
943 struct x25_dte_facilities dte_facilities;
944 int len, addr_len, rc;
945
946 /*
947 * Remove the LCI and frame type.
948 */
949 skb_pull(skb, X25_STD_MIN_LEN);
950
951 /*
952 * Extract the X.25 addresses and convert them to ASCII strings,
953 * and remove them.
954 *
955 * Address block is mandatory in call request packets
956 */
957 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
958 if (addr_len <= 0)
959 goto out_clear_request;
960 skb_pull(skb, addr_len);
961
962 /*
963 * Get the length of the facilities, skip past them for the moment
964 * get the call user data because this is needed to determine
965 * the correct listener
966 *
967 * Facilities length is mandatory in call request packets
968 */
969 if (!pskb_may_pull(skb, 1))
970 goto out_clear_request;
971 len = skb->data[0] + 1;
972 if (!pskb_may_pull(skb, len))
973 goto out_clear_request;
974 skb_pull(skb,len);
975
976 /*
977 * Ensure that the amount of call user data is valid.
978 */
979 if (skb->len > X25_MAX_CUD_LEN)
980 goto out_clear_request;
981
982 /*
983 * Get all the call user data so it can be used in
984 * x25_find_listener and skb_copy_from_linear_data up ahead.
985 */
986 if (!pskb_may_pull(skb, skb->len))
987 goto out_clear_request;
988
989 /*
990 * Find a listener for the particular address/cud pair.
991 */
992 sk = x25_find_listener(&source_addr,skb);
993 skb_push(skb,len);
994
995 if (sk != NULL && sk_acceptq_is_full(sk)) {
996 goto out_sock_put;
997 }
998
999 /*
1000 * We dont have any listeners for this incoming call.
1001 * Try forwarding it.
1002 */
1003 if (sk == NULL) {
1004 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1005 if (sysctl_x25_forward &&
1006 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1007 {
1008 /* Call was forwarded, dont process it any more */
1009 kfree_skb(skb);
1010 rc = 1;
1011 goto out;
1012 } else {
1013 /* No listeners, can't forward, clear the call */
1014 goto out_clear_request;
1015 }
1016 }
1017
1018 /*
1019 * Try to reach a compromise on the requested facilities.
1020 */
1021 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1022 if (len == -1)
1023 goto out_sock_put;
1024
1025 /*
1026 * current neighbour/link might impose additional limits
1027 * on certain facilties
1028 */
1029
1030 x25_limit_facilities(&facilities, nb);
1031
1032 /*
1033 * Try to create a new socket.
1034 */
1035 make = x25_make_new(sk);
1036 if (!make)
1037 goto out_sock_put;
1038
1039 /*
1040 * Remove the facilities
1041 */
1042 skb_pull(skb, len);
1043
1044 skb->sk = make;
1045 make->sk_state = TCP_ESTABLISHED;
1046
1047 makex25 = x25_sk(make);
1048 makex25->lci = lci;
1049 makex25->dest_addr = dest_addr;
1050 makex25->source_addr = source_addr;
1051 makex25->neighbour = nb;
1052 makex25->facilities = facilities;
1053 makex25->dte_facilities= dte_facilities;
1054 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1055 /* ensure no reverse facil on accept */
1056 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1057 /* ensure no calling address extension on accept */
1058 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1059 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1060
1061 /* Normally all calls are accepted immediately */
1062 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1063 x25_write_internal(make, X25_CALL_ACCEPTED);
1064 makex25->state = X25_STATE_3;
1065 }
1066
1067 /*
1068 * Incoming Call User Data.
1069 */
1070 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1071 makex25->calluserdata.cudlength = skb->len;
1072
1073 sk->sk_ack_backlog++;
1074
1075 x25_insert_socket(make);
1076
1077 skb_queue_head(&sk->sk_receive_queue, skb);
1078
1079 x25_start_heartbeat(make);
1080
1081 if (!sock_flag(sk, SOCK_DEAD))
1082 sk->sk_data_ready(sk);
1083 rc = 1;
1084 sock_put(sk);
1085 out:
1086 return rc;
1087 out_sock_put:
1088 sock_put(sk);
1089 out_clear_request:
1090 rc = 0;
1091 x25_transmit_clear_request(nb, lci, 0x01);
1092 goto out;
1093 }
1094
x25_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)1095 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1096 {
1097 struct sock *sk = sock->sk;
1098 struct x25_sock *x25 = x25_sk(sk);
1099 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1100 struct sockaddr_x25 sx25;
1101 struct sk_buff *skb;
1102 unsigned char *asmptr;
1103 int noblock = msg->msg_flags & MSG_DONTWAIT;
1104 size_t size;
1105 int qbit = 0, rc = -EINVAL;
1106
1107 lock_sock(sk);
1108 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1109 goto out;
1110
1111 /* we currently don't support segmented records at the user interface */
1112 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1113 goto out;
1114
1115 rc = -EADDRNOTAVAIL;
1116 if (sock_flag(sk, SOCK_ZAPPED))
1117 goto out;
1118
1119 rc = -EPIPE;
1120 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1121 send_sig(SIGPIPE, current, 0);
1122 goto out;
1123 }
1124
1125 rc = -ENETUNREACH;
1126 if (!x25->neighbour)
1127 goto out;
1128
1129 if (usx25) {
1130 rc = -EINVAL;
1131 if (msg->msg_namelen < sizeof(sx25))
1132 goto out;
1133 memcpy(&sx25, usx25, sizeof(sx25));
1134 rc = -EISCONN;
1135 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1136 goto out;
1137 rc = -EINVAL;
1138 if (sx25.sx25_family != AF_X25)
1139 goto out;
1140 } else {
1141 /*
1142 * FIXME 1003.1g - if the socket is like this because
1143 * it has become closed (not started closed) we ought
1144 * to SIGPIPE, EPIPE;
1145 */
1146 rc = -ENOTCONN;
1147 if (sk->sk_state != TCP_ESTABLISHED)
1148 goto out;
1149
1150 sx25.sx25_family = AF_X25;
1151 sx25.sx25_addr = x25->dest_addr;
1152 }
1153
1154 /* Sanity check the packet size */
1155 if (len > 65535) {
1156 rc = -EMSGSIZE;
1157 goto out;
1158 }
1159
1160 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1161
1162 /* Build a packet */
1163 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1164
1165 if ((msg->msg_flags & MSG_OOB) && len > 32)
1166 len = 32;
1167
1168 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1169
1170 release_sock(sk);
1171 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1172 lock_sock(sk);
1173 if (!skb)
1174 goto out;
1175 X25_SKB_CB(skb)->flags = msg->msg_flags;
1176
1177 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1178
1179 /*
1180 * Put the data on the end
1181 */
1182 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1183
1184 skb_reset_transport_header(skb);
1185 skb_put(skb, len);
1186
1187 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1188 if (rc)
1189 goto out_kfree_skb;
1190
1191 /*
1192 * If the Q BIT Include socket option is in force, the first
1193 * byte of the user data is the logical value of the Q Bit.
1194 */
1195 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1196 if (!pskb_may_pull(skb, 1))
1197 goto out_kfree_skb;
1198
1199 qbit = skb->data[0];
1200 skb_pull(skb, 1);
1201 }
1202
1203 /*
1204 * Push down the X.25 header
1205 */
1206 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1207
1208 if (msg->msg_flags & MSG_OOB) {
1209 if (x25->neighbour->extended) {
1210 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1211 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1212 *asmptr++ = (x25->lci >> 0) & 0xFF;
1213 *asmptr++ = X25_INTERRUPT;
1214 } else {
1215 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1216 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1217 *asmptr++ = (x25->lci >> 0) & 0xFF;
1218 *asmptr++ = X25_INTERRUPT;
1219 }
1220 } else {
1221 if (x25->neighbour->extended) {
1222 /* Build an Extended X.25 header */
1223 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1224 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1225 *asmptr++ = (x25->lci >> 0) & 0xFF;
1226 *asmptr++ = X25_DATA;
1227 *asmptr++ = X25_DATA;
1228 } else {
1229 /* Build an Standard X.25 header */
1230 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1231 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1232 *asmptr++ = (x25->lci >> 0) & 0xFF;
1233 *asmptr++ = X25_DATA;
1234 }
1235
1236 if (qbit)
1237 skb->data[0] |= X25_Q_BIT;
1238 }
1239
1240 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1241 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1242
1243 rc = -ENOTCONN;
1244 if (sk->sk_state != TCP_ESTABLISHED)
1245 goto out_kfree_skb;
1246
1247 if (msg->msg_flags & MSG_OOB)
1248 skb_queue_tail(&x25->interrupt_out_queue, skb);
1249 else {
1250 rc = x25_output(sk, skb);
1251 len = rc;
1252 if (rc < 0)
1253 kfree_skb(skb);
1254 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1255 len++;
1256 }
1257
1258 x25_kick(sk);
1259 rc = len;
1260 out:
1261 release_sock(sk);
1262 return rc;
1263 out_kfree_skb:
1264 kfree_skb(skb);
1265 goto out;
1266 }
1267
1268
x25_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)1269 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1270 int flags)
1271 {
1272 struct sock *sk = sock->sk;
1273 struct x25_sock *x25 = x25_sk(sk);
1274 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1275 size_t copied;
1276 int qbit, header_len;
1277 struct sk_buff *skb;
1278 unsigned char *asmptr;
1279 int rc = -ENOTCONN;
1280
1281 lock_sock(sk);
1282
1283 if (x25->neighbour == NULL)
1284 goto out;
1285
1286 header_len = x25->neighbour->extended ?
1287 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1288
1289 /*
1290 * This works for seqpacket too. The receiver has ordered the queue for
1291 * us! We do one quick check first though
1292 */
1293 if (sk->sk_state != TCP_ESTABLISHED)
1294 goto out;
1295
1296 if (flags & MSG_OOB) {
1297 rc = -EINVAL;
1298 if (sock_flag(sk, SOCK_URGINLINE) ||
1299 !skb_peek(&x25->interrupt_in_queue))
1300 goto out;
1301
1302 skb = skb_dequeue(&x25->interrupt_in_queue);
1303
1304 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1305 goto out_free_dgram;
1306
1307 skb_pull(skb, X25_STD_MIN_LEN);
1308
1309 /*
1310 * No Q bit information on Interrupt data.
1311 */
1312 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1313 asmptr = skb_push(skb, 1);
1314 *asmptr = 0x00;
1315 }
1316
1317 msg->msg_flags |= MSG_OOB;
1318 } else {
1319 /* Now we can treat all alike */
1320 release_sock(sk);
1321 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1322 flags & MSG_DONTWAIT, &rc);
1323 lock_sock(sk);
1324 if (!skb)
1325 goto out;
1326
1327 if (!pskb_may_pull(skb, header_len))
1328 goto out_free_dgram;
1329
1330 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1331
1332 skb_pull(skb, header_len);
1333
1334 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1335 asmptr = skb_push(skb, 1);
1336 *asmptr = qbit;
1337 }
1338 }
1339
1340 skb_reset_transport_header(skb);
1341 copied = skb->len;
1342
1343 if (copied > size) {
1344 copied = size;
1345 msg->msg_flags |= MSG_TRUNC;
1346 }
1347
1348 /* Currently, each datagram always contains a complete record */
1349 msg->msg_flags |= MSG_EOR;
1350
1351 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1352 if (rc)
1353 goto out_free_dgram;
1354
1355 if (sx25) {
1356 sx25->sx25_family = AF_X25;
1357 sx25->sx25_addr = x25->dest_addr;
1358 msg->msg_namelen = sizeof(*sx25);
1359 }
1360
1361 x25_check_rbuf(sk);
1362 rc = copied;
1363 out_free_dgram:
1364 skb_free_datagram(sk, skb);
1365 out:
1366 release_sock(sk);
1367 return rc;
1368 }
1369
1370
x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1371 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1372 {
1373 struct sock *sk = sock->sk;
1374 struct x25_sock *x25 = x25_sk(sk);
1375 void __user *argp = (void __user *)arg;
1376 int rc;
1377
1378 switch (cmd) {
1379 case TIOCOUTQ: {
1380 int amount;
1381
1382 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1383 if (amount < 0)
1384 amount = 0;
1385 rc = put_user(amount, (unsigned int __user *)argp);
1386 break;
1387 }
1388
1389 case TIOCINQ: {
1390 struct sk_buff *skb;
1391 int amount = 0;
1392 /*
1393 * These two are safe on a single CPU system as
1394 * only user tasks fiddle here
1395 */
1396 lock_sock(sk);
1397 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1398 amount = skb->len;
1399 release_sock(sk);
1400 rc = put_user(amount, (unsigned int __user *)argp);
1401 break;
1402 }
1403
1404 case SIOCGSTAMP:
1405 rc = -EINVAL;
1406 if (sk)
1407 rc = sock_get_timestamp(sk,
1408 (struct timeval __user *)argp);
1409 break;
1410 case SIOCGSTAMPNS:
1411 rc = -EINVAL;
1412 if (sk)
1413 rc = sock_get_timestampns(sk,
1414 (struct timespec __user *)argp);
1415 break;
1416 case SIOCGIFADDR:
1417 case SIOCSIFADDR:
1418 case SIOCGIFDSTADDR:
1419 case SIOCSIFDSTADDR:
1420 case SIOCGIFBRDADDR:
1421 case SIOCSIFBRDADDR:
1422 case SIOCGIFNETMASK:
1423 case SIOCSIFNETMASK:
1424 case SIOCGIFMETRIC:
1425 case SIOCSIFMETRIC:
1426 rc = -EINVAL;
1427 break;
1428 case SIOCADDRT:
1429 case SIOCDELRT:
1430 rc = -EPERM;
1431 if (!capable(CAP_NET_ADMIN))
1432 break;
1433 rc = x25_route_ioctl(cmd, argp);
1434 break;
1435 case SIOCX25GSUBSCRIP:
1436 rc = x25_subscr_ioctl(cmd, argp);
1437 break;
1438 case SIOCX25SSUBSCRIP:
1439 rc = -EPERM;
1440 if (!capable(CAP_NET_ADMIN))
1441 break;
1442 rc = x25_subscr_ioctl(cmd, argp);
1443 break;
1444 case SIOCX25GFACILITIES: {
1445 lock_sock(sk);
1446 rc = copy_to_user(argp, &x25->facilities,
1447 sizeof(x25->facilities))
1448 ? -EFAULT : 0;
1449 release_sock(sk);
1450 break;
1451 }
1452
1453 case SIOCX25SFACILITIES: {
1454 struct x25_facilities facilities;
1455 rc = -EFAULT;
1456 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1457 break;
1458 rc = -EINVAL;
1459 lock_sock(sk);
1460 if (sk->sk_state != TCP_LISTEN &&
1461 sk->sk_state != TCP_CLOSE)
1462 goto out_fac_release;
1463 if (facilities.pacsize_in < X25_PS16 ||
1464 facilities.pacsize_in > X25_PS4096)
1465 goto out_fac_release;
1466 if (facilities.pacsize_out < X25_PS16 ||
1467 facilities.pacsize_out > X25_PS4096)
1468 goto out_fac_release;
1469 if (facilities.winsize_in < 1 ||
1470 facilities.winsize_in > 127)
1471 goto out_fac_release;
1472 if (facilities.throughput) {
1473 int out = facilities.throughput & 0xf0;
1474 int in = facilities.throughput & 0x0f;
1475 if (!out)
1476 facilities.throughput |=
1477 X25_DEFAULT_THROUGHPUT << 4;
1478 else if (out < 0x30 || out > 0xD0)
1479 goto out_fac_release;
1480 if (!in)
1481 facilities.throughput |=
1482 X25_DEFAULT_THROUGHPUT;
1483 else if (in < 0x03 || in > 0x0D)
1484 goto out_fac_release;
1485 }
1486 if (facilities.reverse &&
1487 (facilities.reverse & 0x81) != 0x81)
1488 goto out_fac_release;
1489 x25->facilities = facilities;
1490 rc = 0;
1491 out_fac_release:
1492 release_sock(sk);
1493 break;
1494 }
1495
1496 case SIOCX25GDTEFACILITIES: {
1497 lock_sock(sk);
1498 rc = copy_to_user(argp, &x25->dte_facilities,
1499 sizeof(x25->dte_facilities));
1500 release_sock(sk);
1501 if (rc)
1502 rc = -EFAULT;
1503 break;
1504 }
1505
1506 case SIOCX25SDTEFACILITIES: {
1507 struct x25_dte_facilities dtefacs;
1508 rc = -EFAULT;
1509 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1510 break;
1511 rc = -EINVAL;
1512 lock_sock(sk);
1513 if (sk->sk_state != TCP_LISTEN &&
1514 sk->sk_state != TCP_CLOSE)
1515 goto out_dtefac_release;
1516 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1517 goto out_dtefac_release;
1518 if (dtefacs.called_len > X25_MAX_AE_LEN)
1519 goto out_dtefac_release;
1520 x25->dte_facilities = dtefacs;
1521 rc = 0;
1522 out_dtefac_release:
1523 release_sock(sk);
1524 break;
1525 }
1526
1527 case SIOCX25GCALLUSERDATA: {
1528 lock_sock(sk);
1529 rc = copy_to_user(argp, &x25->calluserdata,
1530 sizeof(x25->calluserdata))
1531 ? -EFAULT : 0;
1532 release_sock(sk);
1533 break;
1534 }
1535
1536 case SIOCX25SCALLUSERDATA: {
1537 struct x25_calluserdata calluserdata;
1538
1539 rc = -EFAULT;
1540 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1541 break;
1542 rc = -EINVAL;
1543 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1544 break;
1545 lock_sock(sk);
1546 x25->calluserdata = calluserdata;
1547 release_sock(sk);
1548 rc = 0;
1549 break;
1550 }
1551
1552 case SIOCX25GCAUSEDIAG: {
1553 lock_sock(sk);
1554 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1555 ? -EFAULT : 0;
1556 release_sock(sk);
1557 break;
1558 }
1559
1560 case SIOCX25SCAUSEDIAG: {
1561 struct x25_causediag causediag;
1562 rc = -EFAULT;
1563 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1564 break;
1565 lock_sock(sk);
1566 x25->causediag = causediag;
1567 release_sock(sk);
1568 rc = 0;
1569 break;
1570
1571 }
1572
1573 case SIOCX25SCUDMATCHLEN: {
1574 struct x25_subaddr sub_addr;
1575 rc = -EINVAL;
1576 lock_sock(sk);
1577 if(sk->sk_state != TCP_CLOSE)
1578 goto out_cud_release;
1579 rc = -EFAULT;
1580 if (copy_from_user(&sub_addr, argp,
1581 sizeof(sub_addr)))
1582 goto out_cud_release;
1583 rc = -EINVAL;
1584 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1585 goto out_cud_release;
1586 x25->cudmatchlength = sub_addr.cudmatchlength;
1587 rc = 0;
1588 out_cud_release:
1589 release_sock(sk);
1590 break;
1591 }
1592
1593 case SIOCX25CALLACCPTAPPRV: {
1594 rc = -EINVAL;
1595 lock_sock(sk);
1596 if (sk->sk_state == TCP_CLOSE) {
1597 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1598 rc = 0;
1599 }
1600 release_sock(sk);
1601 break;
1602 }
1603
1604 case SIOCX25SENDCALLACCPT: {
1605 rc = -EINVAL;
1606 lock_sock(sk);
1607 if (sk->sk_state != TCP_ESTABLISHED)
1608 goto out_sendcallaccpt_release;
1609 /* must call accptapprv above */
1610 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1611 goto out_sendcallaccpt_release;
1612 x25_write_internal(sk, X25_CALL_ACCEPTED);
1613 x25->state = X25_STATE_3;
1614 rc = 0;
1615 out_sendcallaccpt_release:
1616 release_sock(sk);
1617 break;
1618 }
1619
1620 default:
1621 rc = -ENOIOCTLCMD;
1622 break;
1623 }
1624
1625 return rc;
1626 }
1627
1628 static const struct net_proto_family x25_family_ops = {
1629 .family = AF_X25,
1630 .create = x25_create,
1631 .owner = THIS_MODULE,
1632 };
1633
1634 #ifdef CONFIG_COMPAT
compat_x25_subscr_ioctl(unsigned int cmd,struct compat_x25_subscrip_struct __user * x25_subscr32)1635 static int compat_x25_subscr_ioctl(unsigned int cmd,
1636 struct compat_x25_subscrip_struct __user *x25_subscr32)
1637 {
1638 struct compat_x25_subscrip_struct x25_subscr;
1639 struct x25_neigh *nb;
1640 struct net_device *dev;
1641 int rc = -EINVAL;
1642
1643 rc = -EFAULT;
1644 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1645 goto out;
1646
1647 rc = -EINVAL;
1648 dev = x25_dev_get(x25_subscr.device);
1649 if (dev == NULL)
1650 goto out;
1651
1652 nb = x25_get_neigh(dev);
1653 if (nb == NULL)
1654 goto out_dev_put;
1655
1656 dev_put(dev);
1657
1658 if (cmd == SIOCX25GSUBSCRIP) {
1659 read_lock_bh(&x25_neigh_list_lock);
1660 x25_subscr.extended = nb->extended;
1661 x25_subscr.global_facil_mask = nb->global_facil_mask;
1662 read_unlock_bh(&x25_neigh_list_lock);
1663 rc = copy_to_user(x25_subscr32, &x25_subscr,
1664 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1665 } else {
1666 rc = -EINVAL;
1667 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1668 rc = 0;
1669 write_lock_bh(&x25_neigh_list_lock);
1670 nb->extended = x25_subscr.extended;
1671 nb->global_facil_mask = x25_subscr.global_facil_mask;
1672 write_unlock_bh(&x25_neigh_list_lock);
1673 }
1674 }
1675 x25_neigh_put(nb);
1676 out:
1677 return rc;
1678 out_dev_put:
1679 dev_put(dev);
1680 goto out;
1681 }
1682
compat_x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1683 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1684 unsigned long arg)
1685 {
1686 void __user *argp = compat_ptr(arg);
1687 struct sock *sk = sock->sk;
1688
1689 int rc = -ENOIOCTLCMD;
1690
1691 switch(cmd) {
1692 case TIOCOUTQ:
1693 case TIOCINQ:
1694 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1695 break;
1696 case SIOCGSTAMP:
1697 rc = -EINVAL;
1698 if (sk)
1699 rc = compat_sock_get_timestamp(sk,
1700 (struct timeval __user*)argp);
1701 break;
1702 case SIOCGSTAMPNS:
1703 rc = -EINVAL;
1704 if (sk)
1705 rc = compat_sock_get_timestampns(sk,
1706 (struct timespec __user*)argp);
1707 break;
1708 case SIOCGIFADDR:
1709 case SIOCSIFADDR:
1710 case SIOCGIFDSTADDR:
1711 case SIOCSIFDSTADDR:
1712 case SIOCGIFBRDADDR:
1713 case SIOCSIFBRDADDR:
1714 case SIOCGIFNETMASK:
1715 case SIOCSIFNETMASK:
1716 case SIOCGIFMETRIC:
1717 case SIOCSIFMETRIC:
1718 rc = -EINVAL;
1719 break;
1720 case SIOCADDRT:
1721 case SIOCDELRT:
1722 rc = -EPERM;
1723 if (!capable(CAP_NET_ADMIN))
1724 break;
1725 rc = x25_route_ioctl(cmd, argp);
1726 break;
1727 case SIOCX25GSUBSCRIP:
1728 rc = compat_x25_subscr_ioctl(cmd, argp);
1729 break;
1730 case SIOCX25SSUBSCRIP:
1731 rc = -EPERM;
1732 if (!capable(CAP_NET_ADMIN))
1733 break;
1734 rc = compat_x25_subscr_ioctl(cmd, argp);
1735 break;
1736 case SIOCX25GFACILITIES:
1737 case SIOCX25SFACILITIES:
1738 case SIOCX25GDTEFACILITIES:
1739 case SIOCX25SDTEFACILITIES:
1740 case SIOCX25GCALLUSERDATA:
1741 case SIOCX25SCALLUSERDATA:
1742 case SIOCX25GCAUSEDIAG:
1743 case SIOCX25SCAUSEDIAG:
1744 case SIOCX25SCUDMATCHLEN:
1745 case SIOCX25CALLACCPTAPPRV:
1746 case SIOCX25SENDCALLACCPT:
1747 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1748 break;
1749 default:
1750 rc = -ENOIOCTLCMD;
1751 break;
1752 }
1753 return rc;
1754 }
1755 #endif
1756
1757 static const struct proto_ops x25_proto_ops = {
1758 .family = AF_X25,
1759 .owner = THIS_MODULE,
1760 .release = x25_release,
1761 .bind = x25_bind,
1762 .connect = x25_connect,
1763 .socketpair = sock_no_socketpair,
1764 .accept = x25_accept,
1765 .getname = x25_getname,
1766 .poll = datagram_poll,
1767 .ioctl = x25_ioctl,
1768 #ifdef CONFIG_COMPAT
1769 .compat_ioctl = compat_x25_ioctl,
1770 #endif
1771 .listen = x25_listen,
1772 .shutdown = sock_no_shutdown,
1773 .setsockopt = x25_setsockopt,
1774 .getsockopt = x25_getsockopt,
1775 .sendmsg = x25_sendmsg,
1776 .recvmsg = x25_recvmsg,
1777 .mmap = sock_no_mmap,
1778 .sendpage = sock_no_sendpage,
1779 };
1780
1781 static struct packet_type x25_packet_type __read_mostly = {
1782 .type = cpu_to_be16(ETH_P_X25),
1783 .func = x25_lapb_receive_frame,
1784 };
1785
1786 static struct notifier_block x25_dev_notifier = {
1787 .notifier_call = x25_device_event,
1788 };
1789
x25_kill_by_neigh(struct x25_neigh * nb)1790 void x25_kill_by_neigh(struct x25_neigh *nb)
1791 {
1792 struct sock *s;
1793
1794 write_lock_bh(&x25_list_lock);
1795
1796 sk_for_each(s, &x25_list)
1797 if (x25_sk(s)->neighbour == nb)
1798 x25_disconnect(s, ENETUNREACH, 0, 0);
1799
1800 write_unlock_bh(&x25_list_lock);
1801
1802 /* Remove any related forwards */
1803 x25_clear_forward_by_dev(nb->dev);
1804 }
1805
x25_init(void)1806 static int __init x25_init(void)
1807 {
1808 int rc;
1809
1810 rc = proto_register(&x25_proto, 0);
1811 if (rc)
1812 goto out;
1813
1814 rc = sock_register(&x25_family_ops);
1815 if (rc)
1816 goto out_proto;
1817
1818 dev_add_pack(&x25_packet_type);
1819
1820 rc = register_netdevice_notifier(&x25_dev_notifier);
1821 if (rc)
1822 goto out_sock;
1823
1824 rc = x25_register_sysctl();
1825 if (rc)
1826 goto out_dev;
1827
1828 rc = x25_proc_init();
1829 if (rc)
1830 goto out_sysctl;
1831
1832 pr_info("Linux Version 0.2\n");
1833
1834 out:
1835 return rc;
1836 out_sysctl:
1837 x25_unregister_sysctl();
1838 out_dev:
1839 unregister_netdevice_notifier(&x25_dev_notifier);
1840 out_sock:
1841 dev_remove_pack(&x25_packet_type);
1842 sock_unregister(AF_X25);
1843 out_proto:
1844 proto_unregister(&x25_proto);
1845 goto out;
1846 }
1847 module_init(x25_init);
1848
x25_exit(void)1849 static void __exit x25_exit(void)
1850 {
1851 x25_proc_exit();
1852 x25_link_free();
1853 x25_route_free();
1854
1855 x25_unregister_sysctl();
1856
1857 unregister_netdevice_notifier(&x25_dev_notifier);
1858
1859 dev_remove_pack(&x25_packet_type);
1860
1861 sock_unregister(AF_X25);
1862 proto_unregister(&x25_proto);
1863 }
1864 module_exit(x25_exit);
1865
1866 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1867 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1868 MODULE_LICENSE("GPL");
1869 MODULE_ALIAS_NETPROTO(PF_X25);
1870