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 #include <linux/uio.h>
57
58 #include <net/x25.h>
59 #include <net/compat.h>
60
61 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
62 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
63 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
64 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
65 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
66 int sysctl_x25_forward = 0;
67
68 HLIST_HEAD(x25_list);
69 DEFINE_RWLOCK(x25_list_lock);
70
71 static const struct proto_ops x25_proto_ops;
72
73 static const struct x25_address null_x25_address = {" "};
74
75 #ifdef CONFIG_COMPAT
76 struct compat_x25_subscrip_struct {
77 char device[200-sizeof(compat_ulong_t)];
78 compat_ulong_t global_facil_mask;
79 compat_uint_t extended;
80 };
81 #endif
82
83
x25_parse_address_block(struct sk_buff * skb,struct x25_address * called_addr,struct x25_address * calling_addr)84 int x25_parse_address_block(struct sk_buff *skb,
85 struct x25_address *called_addr,
86 struct x25_address *calling_addr)
87 {
88 unsigned char len;
89 int needed;
90 int rc;
91
92 if (!pskb_may_pull(skb, 1)) {
93 /* packet has no address block */
94 rc = 0;
95 goto empty;
96 }
97
98 len = *skb->data;
99 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
100
101 if (!pskb_may_pull(skb, needed)) {
102 /* packet is too short to hold the addresses it claims
103 to hold */
104 rc = -1;
105 goto empty;
106 }
107
108 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
109
110 empty:
111 *called_addr->x25_addr = 0;
112 *calling_addr->x25_addr = 0;
113
114 return rc;
115 }
116
117
x25_addr_ntoa(unsigned char * p,struct x25_address * called_addr,struct x25_address * calling_addr)118 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
119 struct x25_address *calling_addr)
120 {
121 unsigned int called_len, calling_len;
122 char *called, *calling;
123 unsigned int i;
124
125 called_len = (*p >> 0) & 0x0F;
126 calling_len = (*p >> 4) & 0x0F;
127
128 called = called_addr->x25_addr;
129 calling = calling_addr->x25_addr;
130 p++;
131
132 for (i = 0; i < (called_len + calling_len); i++) {
133 if (i < called_len) {
134 if (i % 2 != 0) {
135 *called++ = ((*p >> 0) & 0x0F) + '0';
136 p++;
137 } else {
138 *called++ = ((*p >> 4) & 0x0F) + '0';
139 }
140 } else {
141 if (i % 2 != 0) {
142 *calling++ = ((*p >> 0) & 0x0F) + '0';
143 p++;
144 } else {
145 *calling++ = ((*p >> 4) & 0x0F) + '0';
146 }
147 }
148 }
149
150 *called = *calling = '\0';
151
152 return 1 + (called_len + calling_len + 1) / 2;
153 }
154
x25_addr_aton(unsigned char * p,struct x25_address * called_addr,struct x25_address * calling_addr)155 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
156 struct x25_address *calling_addr)
157 {
158 unsigned int called_len, calling_len;
159 char *called, *calling;
160 int i;
161
162 called = called_addr->x25_addr;
163 calling = calling_addr->x25_addr;
164
165 called_len = strlen(called);
166 calling_len = strlen(calling);
167
168 *p++ = (calling_len << 4) | (called_len << 0);
169
170 for (i = 0; i < (called_len + calling_len); i++) {
171 if (i < called_len) {
172 if (i % 2 != 0) {
173 *p |= (*called++ - '0') << 0;
174 p++;
175 } else {
176 *p = 0x00;
177 *p |= (*called++ - '0') << 4;
178 }
179 } else {
180 if (i % 2 != 0) {
181 *p |= (*calling++ - '0') << 0;
182 p++;
183 } else {
184 *p = 0x00;
185 *p |= (*calling++ - '0') << 4;
186 }
187 }
188 }
189
190 return 1 + (called_len + calling_len + 1) / 2;
191 }
192
193 /*
194 * Socket removal during an interrupt is now safe.
195 */
x25_remove_socket(struct sock * sk)196 static void x25_remove_socket(struct sock *sk)
197 {
198 write_lock_bh(&x25_list_lock);
199 sk_del_node_init(sk);
200 write_unlock_bh(&x25_list_lock);
201 }
202
203 /*
204 * Handle device status changes.
205 */
x25_device_event(struct notifier_block * this,unsigned long event,void * ptr)206 static int x25_device_event(struct notifier_block *this, unsigned long event,
207 void *ptr)
208 {
209 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
210 struct x25_neigh *nb;
211
212 if (!net_eq(dev_net(dev), &init_net))
213 return NOTIFY_DONE;
214
215 if (dev->type == ARPHRD_X25) {
216 switch (event) {
217 case NETDEV_REGISTER:
218 case NETDEV_POST_TYPE_CHANGE:
219 x25_link_device_up(dev);
220 break;
221 case NETDEV_DOWN:
222 nb = x25_get_neigh(dev);
223 if (nb) {
224 x25_link_terminated(nb);
225 x25_neigh_put(nb);
226 }
227 x25_route_device_down(dev);
228 break;
229 case NETDEV_PRE_TYPE_CHANGE:
230 case NETDEV_UNREGISTER:
231 x25_link_device_down(dev);
232 break;
233 case NETDEV_CHANGE:
234 if (!netif_carrier_ok(dev)) {
235 nb = x25_get_neigh(dev);
236 if (nb) {
237 x25_link_terminated(nb);
238 x25_neigh_put(nb);
239 }
240 }
241 break;
242 }
243 }
244
245 return NOTIFY_DONE;
246 }
247
248 /*
249 * Add a socket to the bound sockets list.
250 */
x25_insert_socket(struct sock * sk)251 static void x25_insert_socket(struct sock *sk)
252 {
253 write_lock_bh(&x25_list_lock);
254 sk_add_node(sk, &x25_list);
255 write_unlock_bh(&x25_list_lock);
256 }
257
258 /*
259 * Find a socket that wants to accept the Call Request we just
260 * received. Check the full list for an address/cud match.
261 * If no cuds match return the next_best thing, an address match.
262 * Note: if a listening socket has cud set it must only get calls
263 * with matching cud.
264 */
x25_find_listener(struct x25_address * addr,struct sk_buff * skb)265 static struct sock *x25_find_listener(struct x25_address *addr,
266 struct sk_buff *skb)
267 {
268 struct sock *s;
269 struct sock *next_best;
270
271 read_lock_bh(&x25_list_lock);
272 next_best = NULL;
273
274 sk_for_each(s, &x25_list)
275 if ((!strcmp(addr->x25_addr,
276 x25_sk(s)->source_addr.x25_addr) ||
277 !strcmp(x25_sk(s)->source_addr.x25_addr,
278 null_x25_address.x25_addr)) &&
279 s->sk_state == TCP_LISTEN) {
280 /*
281 * Found a listening socket, now check the incoming
282 * call user data vs this sockets call user data
283 */
284 if (x25_sk(s)->cudmatchlength > 0 &&
285 skb->len >= x25_sk(s)->cudmatchlength) {
286 if((memcmp(x25_sk(s)->calluserdata.cuddata,
287 skb->data,
288 x25_sk(s)->cudmatchlength)) == 0) {
289 sock_hold(s);
290 goto found;
291 }
292 } else
293 next_best = s;
294 }
295 if (next_best) {
296 s = next_best;
297 sock_hold(s);
298 goto found;
299 }
300 s = NULL;
301 found:
302 read_unlock_bh(&x25_list_lock);
303 return s;
304 }
305
306 /*
307 * Find a connected X.25 socket given my LCI and neighbour.
308 */
__x25_find_socket(unsigned int lci,struct x25_neigh * nb)309 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
310 {
311 struct sock *s;
312
313 sk_for_each(s, &x25_list)
314 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
315 sock_hold(s);
316 goto found;
317 }
318 s = NULL;
319 found:
320 return s;
321 }
322
x25_find_socket(unsigned int lci,struct x25_neigh * nb)323 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
324 {
325 struct sock *s;
326
327 read_lock_bh(&x25_list_lock);
328 s = __x25_find_socket(lci, nb);
329 read_unlock_bh(&x25_list_lock);
330 return s;
331 }
332
333 /*
334 * Find a unique LCI for a given device.
335 */
x25_new_lci(struct x25_neigh * nb)336 static unsigned int x25_new_lci(struct x25_neigh *nb)
337 {
338 unsigned int lci = 1;
339 struct sock *sk;
340
341 while ((sk = x25_find_socket(lci, nb)) != NULL) {
342 sock_put(sk);
343 if (++lci == 4096) {
344 lci = 0;
345 break;
346 }
347 cond_resched();
348 }
349
350 return lci;
351 }
352
353 /*
354 * Deferred destroy.
355 */
356 static void __x25_destroy_socket(struct sock *);
357
358 /*
359 * handler for deferred kills.
360 */
x25_destroy_timer(struct timer_list * t)361 static void x25_destroy_timer(struct timer_list *t)
362 {
363 struct sock *sk = timer_container_of(sk, t, sk_timer);
364
365 x25_destroy_socket_from_timer(sk);
366 sock_put(sk);
367 }
368
369 /*
370 * This is called from user mode and the timers. Thus it protects itself
371 * against interrupting users but doesn't worry about being called during
372 * work. Once it is removed from the queue no interrupt or bottom half
373 * will touch it and we are (fairly 8-) ) safe.
374 * Not static as it's used by the timer
375 */
__x25_destroy_socket(struct sock * sk)376 static void __x25_destroy_socket(struct sock *sk)
377 {
378 struct sk_buff *skb;
379
380 x25_stop_heartbeat(sk);
381 x25_stop_timer(sk);
382
383 x25_remove_socket(sk);
384 x25_clear_queues(sk); /* Flush the queues */
385
386 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
387 if (skb->sk != sk) { /* A pending connection */
388 /*
389 * Queue the unaccepted socket for death
390 */
391 skb->sk->sk_state = TCP_LISTEN;
392 sock_set_flag(skb->sk, SOCK_DEAD);
393 x25_start_heartbeat(skb->sk);
394 x25_sk(skb->sk)->state = X25_STATE_0;
395 }
396
397 kfree_skb(skb);
398 }
399
400 if (sk_has_allocations(sk)) {
401 /* Defer: outstanding buffers */
402 sk->sk_timer.function = x25_destroy_timer;
403 sk_reset_timer(sk, &sk->sk_timer, jiffies + 10 * HZ);
404 } else {
405 /* drop last reference so sock_put will free */
406 __sock_put(sk);
407 }
408 }
409
x25_destroy_socket_from_timer(struct sock * sk)410 void x25_destroy_socket_from_timer(struct sock *sk)
411 {
412 sock_hold(sk);
413 bh_lock_sock(sk);
414 __x25_destroy_socket(sk);
415 bh_unlock_sock(sk);
416 sock_put(sk);
417 }
418
419 /*
420 * Handling for system calls applied via the various interfaces to a
421 * X.25 socket object.
422 */
423
x25_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)424 static int x25_setsockopt(struct socket *sock, int level, int optname,
425 sockptr_t optval, unsigned int optlen)
426 {
427 int opt;
428 struct sock *sk = sock->sk;
429 int rc = -ENOPROTOOPT;
430
431 if (level != SOL_X25 || optname != X25_QBITINCL)
432 goto out;
433
434 rc = -EINVAL;
435 if (optlen < sizeof(int))
436 goto out;
437
438 rc = -EFAULT;
439 if (copy_from_sockptr(&opt, optval, sizeof(int)))
440 goto out;
441
442 if (opt)
443 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
444 else
445 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
446 rc = 0;
447 out:
448 return rc;
449 }
450
x25_getsockopt(struct socket * sock,int level,int optname,sockopt_t * opt)451 static int x25_getsockopt(struct socket *sock, int level, int optname,
452 sockopt_t *opt)
453 {
454 struct sock *sk = sock->sk;
455 int val, len, rc = -ENOPROTOOPT;
456
457 if (level != SOL_X25 || optname != X25_QBITINCL)
458 goto out;
459
460 len = opt->optlen;
461
462 rc = -EINVAL;
463 if (len < 0)
464 goto out;
465
466 len = min_t(unsigned int, len, sizeof(int));
467 opt->optlen = len;
468
469 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
470 rc = copy_to_iter(&val, len, &opt->iter_out) != len ? -EFAULT : 0;
471 out:
472 return rc;
473 }
474
x25_listen(struct socket * sock,int backlog)475 static int x25_listen(struct socket *sock, int backlog)
476 {
477 struct sock *sk = sock->sk;
478 int rc = -EOPNOTSUPP;
479
480 lock_sock(sk);
481 if (sock->state != SS_UNCONNECTED) {
482 rc = -EINVAL;
483 release_sock(sk);
484 return rc;
485 }
486
487 if (sk->sk_state != TCP_LISTEN) {
488 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
489 sk->sk_max_ack_backlog = backlog;
490 sk->sk_state = TCP_LISTEN;
491 rc = 0;
492 }
493 release_sock(sk);
494
495 return rc;
496 }
497
498 static struct proto x25_proto = {
499 .name = "X25",
500 .owner = THIS_MODULE,
501 .obj_size = sizeof(struct x25_sock),
502 };
503
x25_alloc_socket(struct net * net,int kern)504 static struct sock *x25_alloc_socket(struct net *net, int kern)
505 {
506 struct x25_sock *x25;
507 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
508
509 if (!sk)
510 goto out;
511
512 sock_init_data(NULL, sk);
513
514 x25 = x25_sk(sk);
515 skb_queue_head_init(&x25->ack_queue);
516 skb_queue_head_init(&x25->fragment_queue);
517 skb_queue_head_init(&x25->interrupt_in_queue);
518 skb_queue_head_init(&x25->interrupt_out_queue);
519 out:
520 return sk;
521 }
522
x25_create(struct net * net,struct socket * sock,int protocol,int kern)523 static int x25_create(struct net *net, struct socket *sock, int protocol,
524 int kern)
525 {
526 struct sock *sk;
527 struct x25_sock *x25;
528 int rc = -EAFNOSUPPORT;
529
530 if (!net_eq(net, &init_net))
531 goto out;
532
533 rc = -ESOCKTNOSUPPORT;
534 if (sock->type != SOCK_SEQPACKET)
535 goto out;
536
537 rc = -EINVAL;
538 if (protocol)
539 goto out;
540
541 rc = -ENOMEM;
542 if ((sk = x25_alloc_socket(net, kern)) == NULL)
543 goto out;
544
545 x25 = x25_sk(sk);
546
547 sock_init_data(sock, sk);
548
549 x25_init_timers(sk);
550
551 sock->ops = &x25_proto_ops;
552 sk->sk_protocol = protocol;
553 sk->sk_backlog_rcv = x25_backlog_rcv;
554
555 x25->t21 = sysctl_x25_call_request_timeout;
556 x25->t22 = sysctl_x25_reset_request_timeout;
557 x25->t23 = sysctl_x25_clear_request_timeout;
558 x25->t2 = sysctl_x25_ack_holdback_timeout;
559 x25->state = X25_STATE_0;
560 x25->cudmatchlength = 0;
561 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
562 /* on call accept */
563
564 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
565 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
566 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
567 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
568 x25->facilities.throughput = 0; /* by default don't negotiate
569 throughput */
570 x25->facilities.reverse = X25_DEFAULT_REVERSE;
571 x25->dte_facilities.calling_len = 0;
572 x25->dte_facilities.called_len = 0;
573 memset(x25->dte_facilities.called_ae, '\0',
574 sizeof(x25->dte_facilities.called_ae));
575 memset(x25->dte_facilities.calling_ae, '\0',
576 sizeof(x25->dte_facilities.calling_ae));
577
578 rc = 0;
579 out:
580 return rc;
581 }
582
x25_make_new(struct sock * osk)583 static struct sock *x25_make_new(struct sock *osk)
584 {
585 struct sock *sk = NULL;
586 struct x25_sock *x25, *ox25;
587
588 if (osk->sk_type != SOCK_SEQPACKET)
589 goto out;
590
591 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
592 goto out;
593
594 x25 = x25_sk(sk);
595
596 sk->sk_type = osk->sk_type;
597 sk->sk_priority = READ_ONCE(osk->sk_priority);
598 sk->sk_protocol = osk->sk_protocol;
599 sk->sk_rcvbuf = osk->sk_rcvbuf;
600 sk->sk_sndbuf = osk->sk_sndbuf;
601 sk->sk_state = TCP_ESTABLISHED;
602 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
603 sock_copy_flags(sk, osk);
604
605 ox25 = x25_sk(osk);
606 x25->t21 = ox25->t21;
607 x25->t22 = ox25->t22;
608 x25->t23 = ox25->t23;
609 x25->t2 = ox25->t2;
610 x25->flags = ox25->flags;
611 x25->facilities = ox25->facilities;
612 x25->dte_facilities = ox25->dte_facilities;
613 x25->cudmatchlength = ox25->cudmatchlength;
614
615 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
616 x25_init_timers(sk);
617 out:
618 return sk;
619 }
620
x25_release(struct socket * sock)621 static int x25_release(struct socket *sock)
622 {
623 struct sock *sk = sock->sk;
624 struct x25_sock *x25;
625
626 if (!sk)
627 return 0;
628
629 x25 = x25_sk(sk);
630
631 sock_hold(sk);
632 lock_sock(sk);
633 switch (x25->state) {
634
635 case X25_STATE_0:
636 case X25_STATE_2:
637 x25_disconnect(sk, 0, 0, 0);
638 __x25_destroy_socket(sk);
639 goto out;
640
641 case X25_STATE_1:
642 case X25_STATE_3:
643 case X25_STATE_4:
644 x25_clear_queues(sk);
645 x25_write_internal(sk, X25_CLEAR_REQUEST);
646 x25_start_t23timer(sk);
647 x25->state = X25_STATE_2;
648 sk->sk_state = TCP_CLOSE;
649 sk->sk_shutdown |= SEND_SHUTDOWN;
650 sk->sk_state_change(sk);
651 sock_set_flag(sk, SOCK_DEAD);
652 sock_set_flag(sk, SOCK_DESTROY);
653 break;
654
655 case X25_STATE_5:
656 x25_write_internal(sk, X25_CLEAR_REQUEST);
657 x25_disconnect(sk, 0, 0, 0);
658 __x25_destroy_socket(sk);
659 goto out;
660 }
661
662 sock_orphan(sk);
663 out:
664 release_sock(sk);
665 sock_put(sk);
666 return 0;
667 }
668
x25_bind(struct socket * sock,struct sockaddr_unsized * uaddr,int addr_len)669 static int x25_bind(struct socket *sock, struct sockaddr_unsized *uaddr, int addr_len)
670 {
671 struct sock *sk = sock->sk;
672 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
673 int len, i, rc = 0;
674
675 if (addr_len != sizeof(struct sockaddr_x25) ||
676 addr->sx25_family != AF_X25 ||
677 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
678 rc = -EINVAL;
679 goto out;
680 }
681
682 /* check for the null_x25_address */
683 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
684
685 len = strlen(addr->sx25_addr.x25_addr);
686 for (i = 0; i < len; i++) {
687 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
688 rc = -EINVAL;
689 goto out;
690 }
691 }
692 }
693
694 lock_sock(sk);
695 if (sock_flag(sk, SOCK_ZAPPED)) {
696 x25_sk(sk)->source_addr = addr->sx25_addr;
697 x25_insert_socket(sk);
698 sock_reset_flag(sk, SOCK_ZAPPED);
699 } else {
700 rc = -EINVAL;
701 }
702 release_sock(sk);
703 net_dbg_ratelimited("x25_bind: socket is bound\n");
704 out:
705 return rc;
706 }
707
x25_wait_for_connection_establishment(struct sock * sk)708 static int x25_wait_for_connection_establishment(struct sock *sk)
709 {
710 DECLARE_WAITQUEUE(wait, current);
711 int rc;
712
713 add_wait_queue_exclusive(sk_sleep(sk), &wait);
714 for (;;) {
715 __set_current_state(TASK_INTERRUPTIBLE);
716 rc = -ERESTARTSYS;
717 if (signal_pending(current))
718 break;
719 rc = sock_error(sk);
720 if (rc) {
721 sk->sk_socket->state = SS_UNCONNECTED;
722 break;
723 }
724 rc = -ENOTCONN;
725 if (sk->sk_state == TCP_CLOSE) {
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_unsized * uaddr,int addr_len,int flags)742 static int x25_connect(struct socket *sock, struct sockaddr_unsized *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 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
778 goto out;
779
780 rc = -ENETUNREACH;
781 rt = x25_get_route(&addr->sx25_addr);
782 if (!rt)
783 goto out;
784
785 x25->neighbour = x25_get_neigh(rt->dev);
786 if (!x25->neighbour)
787 goto out_put_route;
788
789 x25_limit_facilities(&x25->facilities, x25->neighbour);
790
791 x25->lci = x25_new_lci(x25->neighbour);
792 if (!x25->lci)
793 goto out_put_neigh;
794
795 rc = -EINVAL;
796 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
797 goto out_put_neigh;
798
799 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
800 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
801
802 x25->dest_addr = addr->sx25_addr;
803
804 /* Move to connecting socket, start sending Connect Requests */
805 sock->state = SS_CONNECTING;
806 sk->sk_state = TCP_SYN_SENT;
807
808 x25->state = X25_STATE_1;
809
810 x25_write_internal(sk, X25_CALL_REQUEST);
811
812 x25_start_heartbeat(sk);
813 x25_start_t21timer(sk);
814
815 /* Now the loop */
816 rc = -EINPROGRESS;
817 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
818 goto out;
819
820 rc = x25_wait_for_connection_establishment(sk);
821 if (rc)
822 goto out_put_neigh;
823
824 sock->state = SS_CONNECTED;
825 rc = 0;
826 out_put_neigh:
827 if (rc && x25->neighbour) {
828 read_lock_bh(&x25_list_lock);
829 x25_neigh_put(x25->neighbour);
830 x25->neighbour = NULL;
831 read_unlock_bh(&x25_list_lock);
832 x25->state = X25_STATE_0;
833 }
834 out_put_route:
835 x25_route_put(rt);
836 out:
837 release_sock(sk);
838 return rc;
839 }
840
x25_wait_for_data(struct sock * sk,long timeout)841 static int x25_wait_for_data(struct sock *sk, long timeout)
842 {
843 DECLARE_WAITQUEUE(wait, current);
844 int rc = 0;
845
846 add_wait_queue_exclusive(sk_sleep(sk), &wait);
847 for (;;) {
848 __set_current_state(TASK_INTERRUPTIBLE);
849 if (sk->sk_shutdown & RCV_SHUTDOWN)
850 break;
851 rc = -ERESTARTSYS;
852 if (signal_pending(current))
853 break;
854 rc = -EAGAIN;
855 if (!timeout)
856 break;
857 rc = 0;
858 if (skb_queue_empty(&sk->sk_receive_queue)) {
859 release_sock(sk);
860 timeout = schedule_timeout(timeout);
861 lock_sock(sk);
862 } else
863 break;
864 }
865 __set_current_state(TASK_RUNNING);
866 remove_wait_queue(sk_sleep(sk), &wait);
867 return rc;
868 }
869
x25_accept(struct socket * sock,struct socket * newsock,struct proto_accept_arg * arg)870 static int x25_accept(struct socket *sock, struct socket *newsock,
871 struct proto_accept_arg *arg)
872 {
873 struct sock *sk = sock->sk;
874 struct sock *newsk;
875 struct sk_buff *skb;
876 int rc = -EINVAL;
877
878 if (!sk)
879 goto out;
880
881 rc = -EOPNOTSUPP;
882 if (sk->sk_type != SOCK_SEQPACKET)
883 goto out;
884
885 lock_sock(sk);
886 rc = -EINVAL;
887 if (sk->sk_state != TCP_LISTEN)
888 goto out2;
889
890 rc = x25_wait_for_data(sk, READ_ONCE(sk->sk_rcvtimeo));
891 if (rc)
892 goto out2;
893 skb = skb_dequeue(&sk->sk_receive_queue);
894 rc = -EINVAL;
895 if (!skb->sk)
896 goto out2;
897 newsk = skb->sk;
898 sock_graft(newsk, newsock);
899
900 /* Now attach up the new socket */
901 skb->sk = NULL;
902 kfree_skb(skb);
903 sk_acceptq_removed(sk);
904 newsock->state = SS_CONNECTED;
905 rc = 0;
906 out2:
907 release_sock(sk);
908 out:
909 return rc;
910 }
911
x25_getname(struct socket * sock,struct sockaddr * uaddr,int peer)912 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
913 int peer)
914 {
915 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
916 struct sock *sk = sock->sk;
917 struct x25_sock *x25 = x25_sk(sk);
918 int rc = 0;
919
920 if (peer) {
921 if (sk->sk_state != TCP_ESTABLISHED) {
922 rc = -ENOTCONN;
923 goto out;
924 }
925 sx25->sx25_addr = x25->dest_addr;
926 } else
927 sx25->sx25_addr = x25->source_addr;
928
929 sx25->sx25_family = AF_X25;
930 rc = sizeof(*sx25);
931
932 out:
933 return rc;
934 }
935
x25_rx_call_request(struct sk_buff * skb,struct x25_neigh * nb,unsigned int lci)936 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
937 unsigned int lci)
938 {
939 struct sock *sk;
940 struct sock *make;
941 struct x25_sock *makex25;
942 struct x25_address source_addr, dest_addr;
943 struct x25_facilities facilities;
944 struct x25_dte_facilities dte_facilities;
945 int len, addr_len, rc;
946
947 /*
948 * Remove the LCI and frame type.
949 */
950 skb_pull(skb, X25_STD_MIN_LEN);
951
952 /*
953 * Extract the X.25 addresses and convert them to ASCII strings,
954 * and remove them.
955 *
956 * Address block is mandatory in call request packets
957 */
958 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
959 if (addr_len <= 0)
960 goto out_clear_request;
961 skb_pull(skb, addr_len);
962
963 /*
964 * Get the length of the facilities, skip past them for the moment
965 * get the call user data because this is needed to determine
966 * the correct listener
967 *
968 * Facilities length is mandatory in call request packets
969 */
970 if (!pskb_may_pull(skb, 1))
971 goto out_clear_request;
972 len = skb->data[0] + 1;
973 if (!pskb_may_pull(skb, len))
974 goto out_clear_request;
975 skb_pull(skb,len);
976
977 /*
978 * Ensure that the amount of call user data is valid.
979 */
980 if (skb->len > X25_MAX_CUD_LEN)
981 goto out_clear_request;
982
983 /*
984 * Get all the call user data so it can be used in
985 * x25_find_listener and skb_copy_from_linear_data up ahead.
986 */
987 if (!pskb_may_pull(skb, skb->len))
988 goto out_clear_request;
989
990 /*
991 * Find a listener for the particular address/cud pair.
992 */
993 sk = x25_find_listener(&source_addr,skb);
994 skb_push(skb,len);
995
996 if (sk != NULL && sk_acceptq_is_full(sk)) {
997 goto out_sock_put;
998 }
999
1000 /*
1001 * We dont have any listeners for this incoming call.
1002 * Try forwarding it.
1003 */
1004 if (sk == NULL) {
1005 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1006 if (sysctl_x25_forward &&
1007 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1008 {
1009 /* Call was forwarded, dont process it any more */
1010 kfree_skb(skb);
1011 rc = 1;
1012 goto out;
1013 } else {
1014 /* No listeners, can't forward, clear the call */
1015 goto out_clear_request;
1016 }
1017 }
1018
1019 /*
1020 * Try to reach a compromise on the requested facilities.
1021 */
1022 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1023 if (len == -1)
1024 goto out_sock_put;
1025
1026 /*
1027 * current neighbour/link might impose additional limits
1028 * on certain facilities
1029 */
1030
1031 x25_limit_facilities(&facilities, nb);
1032
1033 /*
1034 * Try to create a new socket.
1035 */
1036 make = x25_make_new(sk);
1037 if (!make)
1038 goto out_sock_put;
1039
1040 /*
1041 * Remove the facilities
1042 */
1043 skb_pull(skb, len);
1044
1045 skb->sk = make;
1046 make->sk_state = TCP_ESTABLISHED;
1047
1048 makex25 = x25_sk(make);
1049 makex25->lci = lci;
1050 makex25->dest_addr = dest_addr;
1051 makex25->source_addr = source_addr;
1052 x25_neigh_hold(nb);
1053 makex25->neighbour = nb;
1054 makex25->facilities = facilities;
1055 makex25->dte_facilities= dte_facilities;
1056 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1057 /* ensure no reverse facil on accept */
1058 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1059 /* ensure no calling address extension on accept */
1060 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1061 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1062
1063 /* Normally all calls are accepted immediately */
1064 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1065 x25_write_internal(make, X25_CALL_ACCEPTED);
1066 makex25->state = X25_STATE_3;
1067 } else {
1068 makex25->state = X25_STATE_5;
1069 }
1070
1071 /*
1072 * Incoming Call User Data.
1073 */
1074 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1075 makex25->calluserdata.cudlength = skb->len;
1076
1077 sk_acceptq_added(sk);
1078
1079 x25_insert_socket(make);
1080
1081 skb_queue_head(&sk->sk_receive_queue, skb);
1082
1083 x25_start_heartbeat(make);
1084
1085 if (!sock_flag(sk, SOCK_DEAD))
1086 sk->sk_data_ready(sk);
1087 rc = 1;
1088 sock_put(sk);
1089 out:
1090 return rc;
1091 out_sock_put:
1092 sock_put(sk);
1093 out_clear_request:
1094 rc = 0;
1095 x25_transmit_clear_request(nb, lci, 0x01);
1096 goto out;
1097 }
1098
x25_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)1099 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1100 {
1101 struct sock *sk = sock->sk;
1102 struct x25_sock *x25 = x25_sk(sk);
1103 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1104 struct sockaddr_x25 sx25;
1105 struct sk_buff *skb;
1106 unsigned char *asmptr;
1107 int noblock = msg->msg_flags & MSG_DONTWAIT;
1108 size_t size;
1109 int qbit = 0, rc = -EINVAL;
1110
1111 lock_sock(sk);
1112 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1113 goto out;
1114
1115 /* we currently don't support segmented records at the user interface */
1116 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1117 goto out;
1118
1119 rc = -EADDRNOTAVAIL;
1120 if (sock_flag(sk, SOCK_ZAPPED))
1121 goto out;
1122
1123 rc = -EPIPE;
1124 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1125 send_sig(SIGPIPE, current, 0);
1126 goto out;
1127 }
1128
1129 rc = -ENETUNREACH;
1130 if (!x25->neighbour)
1131 goto out;
1132
1133 if (usx25) {
1134 rc = -EINVAL;
1135 if (msg->msg_namelen < sizeof(sx25))
1136 goto out;
1137 memcpy(&sx25, usx25, sizeof(sx25));
1138 rc = -EISCONN;
1139 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1140 goto out;
1141 rc = -EINVAL;
1142 if (sx25.sx25_family != AF_X25)
1143 goto out;
1144 } else {
1145 /*
1146 * FIXME 1003.1g - if the socket is like this because
1147 * it has become closed (not started closed) we ought
1148 * to SIGPIPE, EPIPE;
1149 */
1150 rc = -ENOTCONN;
1151 if (sk->sk_state != TCP_ESTABLISHED)
1152 goto out;
1153
1154 sx25.sx25_family = AF_X25;
1155 sx25.sx25_addr = x25->dest_addr;
1156 }
1157
1158 /* Sanity check the packet size */
1159 if (len > 65535) {
1160 rc = -EMSGSIZE;
1161 goto out;
1162 }
1163
1164 net_dbg_ratelimited("x25_sendmsg: sendto: Addresses built.\n");
1165
1166 /* Build a packet */
1167 net_dbg_ratelimited("x25_sendmsg: sendto: building packet.\n");
1168
1169 if ((msg->msg_flags & MSG_OOB) && len > 32)
1170 len = 32;
1171
1172 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1173
1174 release_sock(sk);
1175 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1176 lock_sock(sk);
1177 if (!skb)
1178 goto out;
1179 X25_SKB_CB(skb)->flags = msg->msg_flags;
1180
1181 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1182
1183 /*
1184 * Put the data on the end
1185 */
1186 net_dbg_ratelimited("x25_sendmsg: Copying user data\n");
1187
1188 skb_reset_transport_header(skb);
1189 skb_put(skb, len);
1190
1191 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1192 if (rc)
1193 goto out_kfree_skb;
1194
1195 /*
1196 * If the Q BIT Include socket option is in force, the first
1197 * byte of the user data is the logical value of the Q Bit.
1198 */
1199 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1200 if (!pskb_may_pull(skb, 1))
1201 goto out_kfree_skb;
1202
1203 qbit = skb->data[0];
1204 skb_pull(skb, 1);
1205 }
1206
1207 /*
1208 * Push down the X.25 header
1209 */
1210 net_dbg_ratelimited("x25_sendmsg: Building X.25 Header.\n");
1211
1212 if (msg->msg_flags & MSG_OOB) {
1213 if (x25->neighbour->extended) {
1214 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1215 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1216 *asmptr++ = (x25->lci >> 0) & 0xFF;
1217 *asmptr++ = X25_INTERRUPT;
1218 } else {
1219 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1220 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1221 *asmptr++ = (x25->lci >> 0) & 0xFF;
1222 *asmptr++ = X25_INTERRUPT;
1223 }
1224 } else {
1225 if (x25->neighbour->extended) {
1226 /* Build an Extended X.25 header */
1227 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1228 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1229 *asmptr++ = (x25->lci >> 0) & 0xFF;
1230 *asmptr++ = X25_DATA;
1231 *asmptr++ = X25_DATA;
1232 } else {
1233 /* Build an Standard X.25 header */
1234 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1235 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1236 *asmptr++ = (x25->lci >> 0) & 0xFF;
1237 *asmptr++ = X25_DATA;
1238 }
1239
1240 if (qbit)
1241 skb->data[0] |= X25_Q_BIT;
1242 }
1243
1244 net_dbg_ratelimited("x25_sendmsg: Built header.\n");
1245 net_dbg_ratelimited("x25_sendmsg: Transmitting buffer\n");
1246
1247 rc = -ENOTCONN;
1248 if (sk->sk_state != TCP_ESTABLISHED)
1249 goto out_kfree_skb;
1250
1251 if (msg->msg_flags & MSG_OOB)
1252 skb_queue_tail(&x25->interrupt_out_queue, skb);
1253 else {
1254 rc = x25_output(sk, skb);
1255 len = rc;
1256 if (rc < 0)
1257 kfree_skb(skb);
1258 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1259 len++;
1260 }
1261
1262 x25_kick(sk);
1263 rc = len;
1264 out:
1265 release_sock(sk);
1266 return rc;
1267 out_kfree_skb:
1268 kfree_skb(skb);
1269 goto out;
1270 }
1271
1272
x25_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)1273 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1274 int flags)
1275 {
1276 struct sock *sk = sock->sk;
1277 struct x25_sock *x25 = x25_sk(sk);
1278 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1279 size_t copied;
1280 int qbit, header_len;
1281 struct sk_buff *skb;
1282 unsigned char *asmptr;
1283 int rc = -ENOTCONN;
1284
1285 lock_sock(sk);
1286
1287 if (x25->neighbour == NULL)
1288 goto out;
1289
1290 header_len = x25->neighbour->extended ?
1291 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1292
1293 /*
1294 * This works for seqpacket too. The receiver has ordered the queue for
1295 * us! We do one quick check first though
1296 */
1297 if (sk->sk_state != TCP_ESTABLISHED)
1298 goto out;
1299
1300 if (flags & MSG_OOB) {
1301 rc = -EINVAL;
1302 if (sock_flag(sk, SOCK_URGINLINE) ||
1303 !skb_peek(&x25->interrupt_in_queue))
1304 goto out;
1305
1306 skb = skb_dequeue(&x25->interrupt_in_queue);
1307
1308 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1309 goto out_free_dgram;
1310
1311 skb_pull(skb, X25_STD_MIN_LEN);
1312
1313 /*
1314 * No Q bit information on Interrupt data.
1315 */
1316 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1317 asmptr = skb_push(skb, 1);
1318 *asmptr = 0x00;
1319 }
1320
1321 msg->msg_flags |= MSG_OOB;
1322 } else {
1323 /* Now we can treat all alike */
1324 release_sock(sk);
1325 skb = skb_recv_datagram(sk, flags, &rc);
1326 lock_sock(sk);
1327 if (!skb)
1328 goto out;
1329
1330 if (!pskb_may_pull(skb, header_len))
1331 goto out_free_dgram;
1332
1333 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1334
1335 skb_pull(skb, header_len);
1336
1337 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1338 asmptr = skb_push(skb, 1);
1339 *asmptr = qbit;
1340 }
1341 }
1342
1343 skb_reset_transport_header(skb);
1344 copied = skb->len;
1345
1346 if (copied > size) {
1347 copied = size;
1348 msg->msg_flags |= MSG_TRUNC;
1349 }
1350
1351 /* Currently, each datagram always contains a complete record */
1352 msg->msg_flags |= MSG_EOR;
1353
1354 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1355 if (rc)
1356 goto out_free_dgram;
1357
1358 if (sx25) {
1359 sx25->sx25_family = AF_X25;
1360 sx25->sx25_addr = x25->dest_addr;
1361 msg->msg_namelen = sizeof(*sx25);
1362 }
1363
1364 x25_check_rbuf(sk);
1365 rc = copied;
1366 out_free_dgram:
1367 skb_free_datagram(sk, skb);
1368 out:
1369 release_sock(sk);
1370 return rc;
1371 }
1372
1373
x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1374 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1375 {
1376 struct sock *sk = sock->sk;
1377 struct x25_sock *x25 = x25_sk(sk);
1378 void __user *argp = (void __user *)arg;
1379 int rc;
1380
1381 switch (cmd) {
1382 case TIOCOUTQ: {
1383 int amount;
1384
1385 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1386 if (amount < 0)
1387 amount = 0;
1388 rc = put_user(amount, (unsigned int __user *)argp);
1389 break;
1390 }
1391
1392 case TIOCINQ: {
1393 struct sk_buff *skb;
1394 int amount = 0;
1395 /*
1396 * These two are safe on a single CPU system as
1397 * only user tasks fiddle here
1398 */
1399 lock_sock(sk);
1400 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1401 amount = skb->len;
1402 release_sock(sk);
1403 rc = put_user(amount, (unsigned int __user *)argp);
1404 break;
1405 }
1406
1407 case SIOCGIFADDR:
1408 case SIOCSIFADDR:
1409 case SIOCGIFDSTADDR:
1410 case SIOCSIFDSTADDR:
1411 case SIOCGIFBRDADDR:
1412 case SIOCSIFBRDADDR:
1413 case SIOCGIFNETMASK:
1414 case SIOCSIFNETMASK:
1415 case SIOCGIFMETRIC:
1416 case SIOCSIFMETRIC:
1417 rc = -EINVAL;
1418 break;
1419 case SIOCADDRT:
1420 case SIOCDELRT:
1421 rc = -EPERM;
1422 if (!capable(CAP_NET_ADMIN))
1423 break;
1424 rc = x25_route_ioctl(cmd, argp);
1425 break;
1426 case SIOCX25GSUBSCRIP:
1427 rc = x25_subscr_ioctl(cmd, argp);
1428 break;
1429 case SIOCX25SSUBSCRIP:
1430 rc = -EPERM;
1431 if (!capable(CAP_NET_ADMIN))
1432 break;
1433 rc = x25_subscr_ioctl(cmd, argp);
1434 break;
1435 case SIOCX25GFACILITIES: {
1436 lock_sock(sk);
1437 rc = copy_to_user(argp, &x25->facilities,
1438 sizeof(x25->facilities))
1439 ? -EFAULT : 0;
1440 release_sock(sk);
1441 break;
1442 }
1443
1444 case SIOCX25SFACILITIES: {
1445 struct x25_facilities facilities;
1446 rc = -EFAULT;
1447 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1448 break;
1449 rc = -EINVAL;
1450 lock_sock(sk);
1451 if (sk->sk_state != TCP_LISTEN &&
1452 sk->sk_state != TCP_CLOSE)
1453 goto out_fac_release;
1454 if (facilities.pacsize_in < X25_PS16 ||
1455 facilities.pacsize_in > X25_PS4096)
1456 goto out_fac_release;
1457 if (facilities.pacsize_out < X25_PS16 ||
1458 facilities.pacsize_out > X25_PS4096)
1459 goto out_fac_release;
1460 if (facilities.winsize_in < 1 ||
1461 facilities.winsize_in > 127)
1462 goto out_fac_release;
1463 if (facilities.throughput) {
1464 int out = facilities.throughput & 0xf0;
1465 int in = facilities.throughput & 0x0f;
1466 if (!out)
1467 facilities.throughput |=
1468 X25_DEFAULT_THROUGHPUT << 4;
1469 else if (out < 0x30 || out > 0xD0)
1470 goto out_fac_release;
1471 if (!in)
1472 facilities.throughput |=
1473 X25_DEFAULT_THROUGHPUT;
1474 else if (in < 0x03 || in > 0x0D)
1475 goto out_fac_release;
1476 }
1477 if (facilities.reverse &&
1478 (facilities.reverse & 0x81) != 0x81)
1479 goto out_fac_release;
1480 x25->facilities = facilities;
1481 rc = 0;
1482 out_fac_release:
1483 release_sock(sk);
1484 break;
1485 }
1486
1487 case SIOCX25GDTEFACILITIES: {
1488 lock_sock(sk);
1489 rc = copy_to_user(argp, &x25->dte_facilities,
1490 sizeof(x25->dte_facilities));
1491 release_sock(sk);
1492 if (rc)
1493 rc = -EFAULT;
1494 break;
1495 }
1496
1497 case SIOCX25SDTEFACILITIES: {
1498 struct x25_dte_facilities dtefacs;
1499 rc = -EFAULT;
1500 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1501 break;
1502 rc = -EINVAL;
1503 lock_sock(sk);
1504 if (sk->sk_state != TCP_LISTEN &&
1505 sk->sk_state != TCP_CLOSE)
1506 goto out_dtefac_release;
1507 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1508 goto out_dtefac_release;
1509 if (dtefacs.called_len > X25_MAX_AE_LEN)
1510 goto out_dtefac_release;
1511 x25->dte_facilities = dtefacs;
1512 rc = 0;
1513 out_dtefac_release:
1514 release_sock(sk);
1515 break;
1516 }
1517
1518 case SIOCX25GCALLUSERDATA: {
1519 lock_sock(sk);
1520 rc = copy_to_user(argp, &x25->calluserdata,
1521 sizeof(x25->calluserdata))
1522 ? -EFAULT : 0;
1523 release_sock(sk);
1524 break;
1525 }
1526
1527 case SIOCX25SCALLUSERDATA: {
1528 struct x25_calluserdata calluserdata;
1529
1530 rc = -EFAULT;
1531 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1532 break;
1533 rc = -EINVAL;
1534 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1535 break;
1536 lock_sock(sk);
1537 x25->calluserdata = calluserdata;
1538 release_sock(sk);
1539 rc = 0;
1540 break;
1541 }
1542
1543 case SIOCX25GCAUSEDIAG: {
1544 lock_sock(sk);
1545 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1546 ? -EFAULT : 0;
1547 release_sock(sk);
1548 break;
1549 }
1550
1551 case SIOCX25SCAUSEDIAG: {
1552 struct x25_causediag causediag;
1553 rc = -EFAULT;
1554 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1555 break;
1556 lock_sock(sk);
1557 x25->causediag = causediag;
1558 release_sock(sk);
1559 rc = 0;
1560 break;
1561
1562 }
1563
1564 case SIOCX25SCUDMATCHLEN: {
1565 struct x25_subaddr sub_addr;
1566 rc = -EINVAL;
1567 lock_sock(sk);
1568 if(sk->sk_state != TCP_CLOSE)
1569 goto out_cud_release;
1570 rc = -EFAULT;
1571 if (copy_from_user(&sub_addr, argp,
1572 sizeof(sub_addr)))
1573 goto out_cud_release;
1574 rc = -EINVAL;
1575 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1576 goto out_cud_release;
1577 x25->cudmatchlength = sub_addr.cudmatchlength;
1578 rc = 0;
1579 out_cud_release:
1580 release_sock(sk);
1581 break;
1582 }
1583
1584 case SIOCX25CALLACCPTAPPRV: {
1585 rc = -EINVAL;
1586 lock_sock(sk);
1587 if (sk->sk_state == TCP_CLOSE) {
1588 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1589 rc = 0;
1590 }
1591 release_sock(sk);
1592 break;
1593 }
1594
1595 case SIOCX25SENDCALLACCPT: {
1596 rc = -EINVAL;
1597 lock_sock(sk);
1598 if (sk->sk_state != TCP_ESTABLISHED)
1599 goto out_sendcallaccpt_release;
1600 /* must call accptapprv above */
1601 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1602 goto out_sendcallaccpt_release;
1603 x25_write_internal(sk, X25_CALL_ACCEPTED);
1604 x25->state = X25_STATE_3;
1605 rc = 0;
1606 out_sendcallaccpt_release:
1607 release_sock(sk);
1608 break;
1609 }
1610
1611 default:
1612 rc = -ENOIOCTLCMD;
1613 break;
1614 }
1615
1616 return rc;
1617 }
1618
1619 static const struct net_proto_family x25_family_ops = {
1620 .family = AF_X25,
1621 .create = x25_create,
1622 .owner = THIS_MODULE,
1623 };
1624
1625 #ifdef CONFIG_COMPAT
compat_x25_subscr_ioctl(unsigned int cmd,struct compat_x25_subscrip_struct __user * x25_subscr32)1626 static int compat_x25_subscr_ioctl(unsigned int cmd,
1627 struct compat_x25_subscrip_struct __user *x25_subscr32)
1628 {
1629 struct compat_x25_subscrip_struct x25_subscr;
1630 struct x25_neigh *nb;
1631 struct net_device *dev;
1632 int rc = -EINVAL;
1633
1634 rc = -EFAULT;
1635 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1636 goto out;
1637
1638 rc = -EINVAL;
1639 dev = x25_dev_get(x25_subscr.device);
1640 if (dev == NULL)
1641 goto out;
1642
1643 nb = x25_get_neigh(dev);
1644 if (nb == NULL)
1645 goto out_dev_put;
1646
1647 dev_put(dev);
1648
1649 if (cmd == SIOCX25GSUBSCRIP) {
1650 read_lock_bh(&x25_neigh_list_lock);
1651 x25_subscr.extended = nb->extended;
1652 x25_subscr.global_facil_mask = nb->global_facil_mask;
1653 read_unlock_bh(&x25_neigh_list_lock);
1654 rc = copy_to_user(x25_subscr32, &x25_subscr,
1655 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1656 } else {
1657 rc = -EINVAL;
1658 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1659 rc = 0;
1660 write_lock_bh(&x25_neigh_list_lock);
1661 nb->extended = x25_subscr.extended;
1662 nb->global_facil_mask = x25_subscr.global_facil_mask;
1663 write_unlock_bh(&x25_neigh_list_lock);
1664 }
1665 }
1666 x25_neigh_put(nb);
1667 out:
1668 return rc;
1669 out_dev_put:
1670 dev_put(dev);
1671 goto out;
1672 }
1673
compat_x25_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1674 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1675 unsigned long arg)
1676 {
1677 void __user *argp = compat_ptr(arg);
1678 int rc = -ENOIOCTLCMD;
1679
1680 switch(cmd) {
1681 case TIOCOUTQ:
1682 case TIOCINQ:
1683 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1684 break;
1685 case SIOCGIFADDR:
1686 case SIOCSIFADDR:
1687 case SIOCGIFDSTADDR:
1688 case SIOCSIFDSTADDR:
1689 case SIOCGIFBRDADDR:
1690 case SIOCSIFBRDADDR:
1691 case SIOCGIFNETMASK:
1692 case SIOCSIFNETMASK:
1693 case SIOCGIFMETRIC:
1694 case SIOCSIFMETRIC:
1695 rc = -EINVAL;
1696 break;
1697 case SIOCADDRT:
1698 case SIOCDELRT:
1699 rc = -EPERM;
1700 if (!capable(CAP_NET_ADMIN))
1701 break;
1702 rc = x25_route_ioctl(cmd, argp);
1703 break;
1704 case SIOCX25GSUBSCRIP:
1705 rc = compat_x25_subscr_ioctl(cmd, argp);
1706 break;
1707 case SIOCX25SSUBSCRIP:
1708 rc = -EPERM;
1709 if (!capable(CAP_NET_ADMIN))
1710 break;
1711 rc = compat_x25_subscr_ioctl(cmd, argp);
1712 break;
1713 case SIOCX25GFACILITIES:
1714 case SIOCX25SFACILITIES:
1715 case SIOCX25GDTEFACILITIES:
1716 case SIOCX25SDTEFACILITIES:
1717 case SIOCX25GCALLUSERDATA:
1718 case SIOCX25SCALLUSERDATA:
1719 case SIOCX25GCAUSEDIAG:
1720 case SIOCX25SCAUSEDIAG:
1721 case SIOCX25SCUDMATCHLEN:
1722 case SIOCX25CALLACCPTAPPRV:
1723 case SIOCX25SENDCALLACCPT:
1724 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1725 break;
1726 default:
1727 rc = -ENOIOCTLCMD;
1728 break;
1729 }
1730 return rc;
1731 }
1732 #endif
1733
1734 static const struct proto_ops x25_proto_ops = {
1735 .family = AF_X25,
1736 .owner = THIS_MODULE,
1737 .release = x25_release,
1738 .bind = x25_bind,
1739 .connect = x25_connect,
1740 .socketpair = sock_no_socketpair,
1741 .accept = x25_accept,
1742 .getname = x25_getname,
1743 .poll = datagram_poll,
1744 .ioctl = x25_ioctl,
1745 #ifdef CONFIG_COMPAT
1746 .compat_ioctl = compat_x25_ioctl,
1747 #endif
1748 .gettstamp = sock_gettstamp,
1749 .listen = x25_listen,
1750 .shutdown = sock_no_shutdown,
1751 .setsockopt = x25_setsockopt,
1752 .getsockopt_iter = x25_getsockopt,
1753 .sendmsg = x25_sendmsg,
1754 .recvmsg = x25_recvmsg,
1755 .mmap = sock_no_mmap,
1756 };
1757
1758 static struct packet_type x25_packet_type __read_mostly = {
1759 .type = cpu_to_be16(ETH_P_X25),
1760 .func = x25_lapb_receive_frame,
1761 };
1762
1763 static struct notifier_block x25_dev_notifier = {
1764 .notifier_call = x25_device_event,
1765 };
1766
x25_kill_by_neigh(struct x25_neigh * nb)1767 void x25_kill_by_neigh(struct x25_neigh *nb)
1768 {
1769 struct sock *s;
1770
1771 again:
1772 write_lock_bh(&x25_list_lock);
1773
1774 sk_for_each(s, &x25_list) {
1775 if (x25_sk(s)->neighbour == nb) {
1776 sock_hold(s);
1777 write_unlock_bh(&x25_list_lock);
1778 lock_sock(s);
1779 if (x25_sk(s)->neighbour == nb)
1780 x25_disconnect(s, ENETUNREACH, 0, 0);
1781 release_sock(s);
1782 sock_put(s);
1783 goto again;
1784 }
1785 }
1786 write_unlock_bh(&x25_list_lock);
1787
1788 /* Remove any related forwards */
1789 x25_clear_forward_by_dev(nb->dev);
1790 }
1791
x25_init(void)1792 static int __init x25_init(void)
1793 {
1794 int rc;
1795
1796 rc = proto_register(&x25_proto, 0);
1797 if (rc)
1798 goto out;
1799
1800 rc = sock_register(&x25_family_ops);
1801 if (rc)
1802 goto out_proto;
1803
1804 dev_add_pack(&x25_packet_type);
1805
1806 rc = register_netdevice_notifier(&x25_dev_notifier);
1807 if (rc)
1808 goto out_sock;
1809
1810 rc = x25_register_sysctl();
1811 if (rc)
1812 goto out_dev;
1813
1814 rc = x25_proc_init();
1815 if (rc)
1816 goto out_sysctl;
1817
1818 pr_info("Linux Version 0.2\n");
1819
1820 out:
1821 return rc;
1822 out_sysctl:
1823 x25_unregister_sysctl();
1824 out_dev:
1825 unregister_netdevice_notifier(&x25_dev_notifier);
1826 out_sock:
1827 dev_remove_pack(&x25_packet_type);
1828 sock_unregister(AF_X25);
1829 out_proto:
1830 proto_unregister(&x25_proto);
1831 goto out;
1832 }
1833 module_init(x25_init);
1834
x25_exit(void)1835 static void __exit x25_exit(void)
1836 {
1837 x25_proc_exit();
1838 x25_link_free();
1839 x25_route_free();
1840
1841 x25_unregister_sysctl();
1842
1843 unregister_netdevice_notifier(&x25_dev_notifier);
1844
1845 dev_remove_pack(&x25_packet_type);
1846
1847 sock_unregister(AF_X25);
1848 proto_unregister(&x25_proto);
1849 }
1850 module_exit(x25_exit);
1851
1852 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1853 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1854 MODULE_LICENSE("GPL");
1855 MODULE_ALIAS_NETPROTO(PF_X25);
1856