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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>
52#include <linux/notifier.h>
53#include <linux/init.h>
54#include <linux/compat.h>
55#include <linux/ctype.h>
56
57#include <net/x25.h>
58#include <net/compat.h>
59
60int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
61int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
62int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
63int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
64int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
65int sysctl_x25_forward = 0;
66
67HLIST_HEAD(x25_list);
68DEFINE_RWLOCK(x25_list_lock);
69
70static const struct proto_ops x25_proto_ops;
71
72static const struct x25_address null_x25_address = {" "};
73
74#ifdef CONFIG_COMPAT
75struct compat_x25_subscrip_struct {
76 char device[200-sizeof(compat_ulong_t)];
77 compat_ulong_t global_facil_mask;
78 compat_uint_t extended;
79};
80#endif
81
82
83int x25_parse_address_block(struct sk_buff *skb,
84 struct x25_address *called_addr,
85 struct x25_address *calling_addr)
86{
87 unsigned char len;
88 int needed;
89 int rc;
90
91 if (!pskb_may_pull(skb, 1)) {
92
93 rc = 0;
94 goto empty;
95 }
96
97 len = *skb->data;
98 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
99
100 if (!pskb_may_pull(skb, needed)) {
101
102
103 rc = -1;
104 goto empty;
105 }
106
107 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
108
109empty:
110 *called_addr->x25_addr = 0;
111 *calling_addr->x25_addr = 0;
112
113 return rc;
114}
115
116
117int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
118 struct x25_address *calling_addr)
119{
120 unsigned int called_len, calling_len;
121 char *called, *calling;
122 unsigned int i;
123
124 called_len = (*p >> 0) & 0x0F;
125 calling_len = (*p >> 4) & 0x0F;
126
127 called = called_addr->x25_addr;
128 calling = calling_addr->x25_addr;
129 p++;
130
131 for (i = 0; i < (called_len + calling_len); i++) {
132 if (i < called_len) {
133 if (i % 2 != 0) {
134 *called++ = ((*p >> 0) & 0x0F) + '0';
135 p++;
136 } else {
137 *called++ = ((*p >> 4) & 0x0F) + '0';
138 }
139 } else {
140 if (i % 2 != 0) {
141 *calling++ = ((*p >> 0) & 0x0F) + '0';
142 p++;
143 } else {
144 *calling++ = ((*p >> 4) & 0x0F) + '0';
145 }
146 }
147 }
148
149 *called = *calling = '\0';
150
151 return 1 + (called_len + calling_len + 1) / 2;
152}
153
154int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
155 struct x25_address *calling_addr)
156{
157 unsigned int called_len, calling_len;
158 char *called, *calling;
159 int i;
160
161 called = called_addr->x25_addr;
162 calling = calling_addr->x25_addr;
163
164 called_len = strlen(called);
165 calling_len = strlen(calling);
166
167 *p++ = (calling_len << 4) | (called_len << 0);
168
169 for (i = 0; i < (called_len + calling_len); i++) {
170 if (i < called_len) {
171 if (i % 2 != 0) {
172 *p |= (*called++ - '0') << 0;
173 p++;
174 } else {
175 *p = 0x00;
176 *p |= (*called++ - '0') << 4;
177 }
178 } else {
179 if (i % 2 != 0) {
180 *p |= (*calling++ - '0') << 0;
181 p++;
182 } else {
183 *p = 0x00;
184 *p |= (*calling++ - '0') << 4;
185 }
186 }
187 }
188
189 return 1 + (called_len + calling_len + 1) / 2;
190}
191
192
193
194
195static void x25_remove_socket(struct sock *sk)
196{
197 write_lock_bh(&x25_list_lock);
198 sk_del_node_init(sk);
199 write_unlock_bh(&x25_list_lock);
200}
201
202
203
204
205static int x25_device_event(struct notifier_block *this, unsigned long event,
206 void *ptr)
207{
208 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
209 struct x25_neigh *nb;
210
211 if (!net_eq(dev_net(dev), &init_net))
212 return NOTIFY_DONE;
213
214 if (dev->type == ARPHRD_X25) {
215 switch (event) {
216 case NETDEV_REGISTER:
217 case NETDEV_POST_TYPE_CHANGE:
218 x25_link_device_up(dev);
219 break;
220 case NETDEV_DOWN:
221 nb = x25_get_neigh(dev);
222 if (nb) {
223 x25_link_terminated(nb);
224 x25_neigh_put(nb);
225 }
226 x25_route_device_down(dev);
227 break;
228 case NETDEV_PRE_TYPE_CHANGE:
229 case NETDEV_UNREGISTER:
230 x25_link_device_down(dev);
231 break;
232 case NETDEV_CHANGE:
233 if (!netif_carrier_ok(dev)) {
234 nb = x25_get_neigh(dev);
235 if (nb) {
236 x25_link_terminated(nb);
237 x25_neigh_put(nb);
238 }
239 }
240 break;
241 }
242 }
243
244 return NOTIFY_DONE;
245}
246
247
248
249
250static void x25_insert_socket(struct sock *sk)
251{
252 write_lock_bh(&x25_list_lock);
253 sk_add_node(sk, &x25_list);
254 write_unlock_bh(&x25_list_lock);
255}
256
257
258
259
260
261
262
263
264static struct sock *x25_find_listener(struct x25_address *addr,
265 struct sk_buff *skb)
266{
267 struct sock *s;
268 struct sock *next_best;
269
270 read_lock_bh(&x25_list_lock);
271 next_best = NULL;
272
273 sk_for_each(s, &x25_list)
274 if ((!strcmp(addr->x25_addr,
275 x25_sk(s)->source_addr.x25_addr) ||
276 !strcmp(x25_sk(s)->source_addr.x25_addr,
277 null_x25_address.x25_addr)) &&
278 s->sk_state == TCP_LISTEN) {
279
280
281
282
283 if (x25_sk(s)->cudmatchlength > 0 &&
284 skb->len >= x25_sk(s)->cudmatchlength) {
285 if((memcmp(x25_sk(s)->calluserdata.cuddata,
286 skb->data,
287 x25_sk(s)->cudmatchlength)) == 0) {
288 sock_hold(s);
289 goto found;
290 }
291 } else
292 next_best = s;
293 }
294 if (next_best) {
295 s = next_best;
296 sock_hold(s);
297 goto found;
298 }
299 s = NULL;
300found:
301 read_unlock_bh(&x25_list_lock);
302 return s;
303}
304
305
306
307
308static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
309{
310 struct sock *s;
311
312 sk_for_each(s, &x25_list)
313 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
314 sock_hold(s);
315 goto found;
316 }
317 s = NULL;
318found:
319 return s;
320}
321
322struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
323{
324 struct sock *s;
325
326 read_lock_bh(&x25_list_lock);
327 s = __x25_find_socket(lci, nb);
328 read_unlock_bh(&x25_list_lock);
329 return s;
330}
331
332
333
334
335static unsigned int x25_new_lci(struct x25_neigh *nb)
336{
337 unsigned int lci = 1;
338 struct sock *sk;
339
340 while ((sk = x25_find_socket(lci, nb)) != NULL) {
341 sock_put(sk);
342 if (++lci == 4096) {
343 lci = 0;
344 break;
345 }
346 cond_resched();
347 }
348
349 return lci;
350}
351
352
353
354
355static void __x25_destroy_socket(struct sock *);
356
357
358
359
360static void x25_destroy_timer(struct timer_list *t)
361{
362 struct sock *sk = from_timer(sk, t, sk_timer);
363
364 x25_destroy_socket_from_timer(sk);
365}
366
367
368
369
370
371
372
373
374static void __x25_destroy_socket(struct sock *sk)
375{
376 struct sk_buff *skb;
377
378 x25_stop_heartbeat(sk);
379 x25_stop_timer(sk);
380
381 x25_remove_socket(sk);
382 x25_clear_queues(sk);
383
384 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
385 if (skb->sk != sk) {
386
387
388
389 skb->sk->sk_state = TCP_LISTEN;
390 sock_set_flag(skb->sk, SOCK_DEAD);
391 x25_start_heartbeat(skb->sk);
392 x25_sk(skb->sk)->state = X25_STATE_0;
393 }
394
395 kfree_skb(skb);
396 }
397
398 if (sk_has_allocations(sk)) {
399
400 sk->sk_timer.expires = jiffies + 10 * HZ;
401 sk->sk_timer.function = x25_destroy_timer;
402 add_timer(&sk->sk_timer);
403 } else {
404
405 __sock_put(sk);
406 }
407}
408
409void x25_destroy_socket_from_timer(struct sock *sk)
410{
411 sock_hold(sk);
412 bh_lock_sock(sk);
413 __x25_destroy_socket(sk);
414 bh_unlock_sock(sk);
415 sock_put(sk);
416}
417
418
419
420
421
422
423static int x25_setsockopt(struct socket *sock, int level, int optname,
424 sockptr_t optval, unsigned int optlen)
425{
426 int opt;
427 struct sock *sk = sock->sk;
428 int rc = -ENOPROTOOPT;
429
430 if (level != SOL_X25 || optname != X25_QBITINCL)
431 goto out;
432
433 rc = -EINVAL;
434 if (optlen < sizeof(int))
435 goto out;
436
437 rc = -EFAULT;
438 if (copy_from_sockptr(&opt, optval, sizeof(int)))
439 goto out;
440
441 if (opt)
442 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
443 else
444 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
445 rc = 0;
446out:
447 return rc;
448}
449
450static int x25_getsockopt(struct socket *sock, int level, int optname,
451 char __user *optval, int __user *optlen)
452{
453 struct sock *sk = sock->sk;
454 int val, len, rc = -ENOPROTOOPT;
455
456 if (level != SOL_X25 || optname != X25_QBITINCL)
457 goto out;
458
459 rc = -EFAULT;
460 if (get_user(len, optlen))
461 goto out;
462
463 len = min_t(unsigned int, len, sizeof(int));
464
465 rc = -EINVAL;
466 if (len < 0)
467 goto out;
468
469 rc = -EFAULT;
470 if (put_user(len, optlen))
471 goto out;
472
473 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
474 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
475out:
476 return rc;
477}
478
479static int x25_listen(struct socket *sock, int backlog)
480{
481 struct sock *sk = sock->sk;
482 int rc = -EOPNOTSUPP;
483
484 lock_sock(sk);
485 if (sk->sk_state != TCP_LISTEN) {
486 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
487 sk->sk_max_ack_backlog = backlog;
488 sk->sk_state = TCP_LISTEN;
489 rc = 0;
490 }
491 release_sock(sk);
492
493 return rc;
494}
495
496static struct proto x25_proto = {
497 .name = "X25",
498 .owner = THIS_MODULE,
499 .obj_size = sizeof(struct x25_sock),
500};
501
502static struct sock *x25_alloc_socket(struct net *net, int kern)
503{
504 struct x25_sock *x25;
505 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
506
507 if (!sk)
508 goto out;
509
510 sock_init_data(NULL, sk);
511
512 x25 = x25_sk(sk);
513 skb_queue_head_init(&x25->ack_queue);
514 skb_queue_head_init(&x25->fragment_queue);
515 skb_queue_head_init(&x25->interrupt_in_queue);
516 skb_queue_head_init(&x25->interrupt_out_queue);
517out:
518 return sk;
519}
520
521static int x25_create(struct net *net, struct socket *sock, int protocol,
522 int kern)
523{
524 struct sock *sk;
525 struct x25_sock *x25;
526 int rc = -EAFNOSUPPORT;
527
528 if (!net_eq(net, &init_net))
529 goto out;
530
531 rc = -ESOCKTNOSUPPORT;
532 if (sock->type != SOCK_SEQPACKET)
533 goto out;
534
535 rc = -EINVAL;
536 if (protocol)
537 goto out;
538
539 rc = -ENOMEM;
540 if ((sk = x25_alloc_socket(net, kern)) == NULL)
541 goto out;
542
543 x25 = x25_sk(sk);
544
545 sock_init_data(sock, sk);
546
547 x25_init_timers(sk);
548
549 sock->ops = &x25_proto_ops;
550 sk->sk_protocol = protocol;
551 sk->sk_backlog_rcv = x25_backlog_rcv;
552
553 x25->t21 = sysctl_x25_call_request_timeout;
554 x25->t22 = sysctl_x25_reset_request_timeout;
555 x25->t23 = sysctl_x25_clear_request_timeout;
556 x25->t2 = sysctl_x25_ack_holdback_timeout;
557 x25->state = X25_STATE_0;
558 x25->cudmatchlength = 0;
559 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
560
561
562 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
563 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
564 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
565 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
566 x25->facilities.throughput = 0;
567
568 x25->facilities.reverse = X25_DEFAULT_REVERSE;
569 x25->dte_facilities.calling_len = 0;
570 x25->dte_facilities.called_len = 0;
571 memset(x25->dte_facilities.called_ae, '\0',
572 sizeof(x25->dte_facilities.called_ae));
573 memset(x25->dte_facilities.calling_ae, '\0',
574 sizeof(x25->dte_facilities.calling_ae));
575
576 rc = 0;
577out:
578 return rc;
579}
580
581static struct sock *x25_make_new(struct sock *osk)
582{
583 struct sock *sk = NULL;
584 struct x25_sock *x25, *ox25;
585
586 if (osk->sk_type != SOCK_SEQPACKET)
587 goto out;
588
589 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
590 goto out;
591
592 x25 = x25_sk(sk);
593
594 sk->sk_type = osk->sk_type;
595 sk->sk_priority = osk->sk_priority;
596 sk->sk_protocol = osk->sk_protocol;
597 sk->sk_rcvbuf = osk->sk_rcvbuf;
598 sk->sk_sndbuf = osk->sk_sndbuf;
599 sk->sk_state = TCP_ESTABLISHED;
600 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
601 sock_copy_flags(sk, osk);
602
603 ox25 = x25_sk(osk);
604 x25->t21 = ox25->t21;
605 x25->t22 = ox25->t22;
606 x25->t23 = ox25->t23;
607 x25->t2 = ox25->t2;
608 x25->flags = ox25->flags;
609 x25->facilities = ox25->facilities;
610 x25->dte_facilities = ox25->dte_facilities;
611 x25->cudmatchlength = ox25->cudmatchlength;
612
613 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
614 x25_init_timers(sk);
615out:
616 return sk;
617}
618
619static int x25_release(struct socket *sock)
620{
621 struct sock *sk = sock->sk;
622 struct x25_sock *x25;
623
624 if (!sk)
625 return 0;
626
627 x25 = x25_sk(sk);
628
629 sock_hold(sk);
630 lock_sock(sk);
631 switch (x25->state) {
632
633 case X25_STATE_0:
634 case X25_STATE_2:
635 x25_disconnect(sk, 0, 0, 0);
636 __x25_destroy_socket(sk);
637 goto out;
638
639 case X25_STATE_1:
640 case X25_STATE_3:
641 case X25_STATE_4:
642 x25_clear_queues(sk);
643 x25_write_internal(sk, X25_CLEAR_REQUEST);
644 x25_start_t23timer(sk);
645 x25->state = X25_STATE_2;
646 sk->sk_state = TCP_CLOSE;
647 sk->sk_shutdown |= SEND_SHUTDOWN;
648 sk->sk_state_change(sk);
649 sock_set_flag(sk, SOCK_DEAD);
650 sock_set_flag(sk, SOCK_DESTROY);
651 break;
652
653 case X25_STATE_5:
654 x25_write_internal(sk, X25_CLEAR_REQUEST);
655 x25_disconnect(sk, 0, 0, 0);
656 __x25_destroy_socket(sk);
657 goto out;
658 }
659
660 sock_orphan(sk);
661out:
662 release_sock(sk);
663 sock_put(sk);
664 return 0;
665}
666
667static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
668{
669 struct sock *sk = sock->sk;
670 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
671 int len, i, rc = 0;
672
673 if (addr_len != sizeof(struct sockaddr_x25) ||
674 addr->sx25_family != AF_X25 ||
675 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
676 rc = -EINVAL;
677 goto out;
678 }
679
680
681 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
682
683 len = strlen(addr->sx25_addr.x25_addr);
684 for (i = 0; i < len; i++) {
685 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
686 rc = -EINVAL;
687 goto out;
688 }
689 }
690 }
691
692 lock_sock(sk);
693 if (sock_flag(sk, SOCK_ZAPPED)) {
694 x25_sk(sk)->source_addr = addr->sx25_addr;
695 x25_insert_socket(sk);
696 sock_reset_flag(sk, SOCK_ZAPPED);
697 } else {
698 rc = -EINVAL;
699 }
700 release_sock(sk);
701 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
702out:
703 return rc;
704}
705
706static int x25_wait_for_connection_establishment(struct sock *sk)
707{
708 DECLARE_WAITQUEUE(wait, current);
709 int rc;
710
711 add_wait_queue_exclusive(sk_sleep(sk), &wait);
712 for (;;) {
713 __set_current_state(TASK_INTERRUPTIBLE);
714 rc = -ERESTARTSYS;
715 if (signal_pending(current))
716 break;
717 rc = sock_error(sk);
718 if (rc) {
719 sk->sk_socket->state = SS_UNCONNECTED;
720 break;
721 }
722 rc = 0;
723 if (sk->sk_state != TCP_ESTABLISHED) {
724 release_sock(sk);
725 schedule();
726 lock_sock(sk);
727 } else
728 break;
729 }
730 __set_current_state(TASK_RUNNING);
731 remove_wait_queue(sk_sleep(sk), &wait);
732 return rc;
733}
734
735static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
736 int addr_len, int flags)
737{
738 struct sock *sk = sock->sk;
739 struct x25_sock *x25 = x25_sk(sk);
740 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
741 struct x25_route *rt;
742 int rc = 0;
743
744 lock_sock(sk);
745 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
746 sock->state = SS_CONNECTED;
747 goto out;
748 }
749
750 rc = -ECONNREFUSED;
751 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
752 sock->state = SS_UNCONNECTED;
753 goto out;
754 }
755
756 rc = -EISCONN;
757 if (sk->sk_state == TCP_ESTABLISHED)
758 goto out;
759
760 rc = -EALREADY;
761 if (sk->sk_state == TCP_SYN_SENT)
762 goto out;
763
764 sk->sk_state = TCP_CLOSE;
765 sock->state = SS_UNCONNECTED;
766
767 rc = -EINVAL;
768 if (addr_len != sizeof(struct sockaddr_x25) ||
769 addr->sx25_family != AF_X25 ||
770 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
771 goto out;
772
773 rc = -ENETUNREACH;
774 rt = x25_get_route(&addr->sx25_addr);
775 if (!rt)
776 goto out;
777
778 x25->neighbour = x25_get_neigh(rt->dev);
779 if (!x25->neighbour)
780 goto out_put_route;
781
782 x25_limit_facilities(&x25->facilities, x25->neighbour);
783
784 x25->lci = x25_new_lci(x25->neighbour);
785 if (!x25->lci)
786 goto out_put_neigh;
787
788 rc = -EINVAL;
789 if (sock_flag(sk, SOCK_ZAPPED))
790 goto out_put_neigh;
791
792 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
793 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
794
795 x25->dest_addr = addr->sx25_addr;
796
797
798 sock->state = SS_CONNECTING;
799 sk->sk_state = TCP_SYN_SENT;
800
801 x25->state = X25_STATE_1;
802
803 x25_write_internal(sk, X25_CALL_REQUEST);
804
805 x25_start_heartbeat(sk);
806 x25_start_t21timer(sk);
807
808
809 rc = -EINPROGRESS;
810 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
811 goto out;
812
813 rc = x25_wait_for_connection_establishment(sk);
814 if (rc)
815 goto out_put_neigh;
816
817 sock->state = SS_CONNECTED;
818 rc = 0;
819out_put_neigh:
820 if (rc && x25->neighbour) {
821 read_lock_bh(&x25_list_lock);
822 x25_neigh_put(x25->neighbour);
823 x25->neighbour = NULL;
824 read_unlock_bh(&x25_list_lock);
825 x25->state = X25_STATE_0;
826 }
827out_put_route:
828 x25_route_put(rt);
829out:
830 release_sock(sk);
831 return rc;
832}
833
834static int x25_wait_for_data(struct sock *sk, long timeout)
835{
836 DECLARE_WAITQUEUE(wait, current);
837 int rc = 0;
838
839 add_wait_queue_exclusive(sk_sleep(sk), &wait);
840 for (;;) {
841 __set_current_state(TASK_INTERRUPTIBLE);
842 if (sk->sk_shutdown & RCV_SHUTDOWN)
843 break;
844 rc = -ERESTARTSYS;
845 if (signal_pending(current))
846 break;
847 rc = -EAGAIN;
848 if (!timeout)
849 break;
850 rc = 0;
851 if (skb_queue_empty(&sk->sk_receive_queue)) {
852 release_sock(sk);
853 timeout = schedule_timeout(timeout);
854 lock_sock(sk);
855 } else
856 break;
857 }
858 __set_current_state(TASK_RUNNING);
859 remove_wait_queue(sk_sleep(sk), &wait);
860 return rc;
861}
862
863static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
864 bool kern)
865{
866 struct sock *sk = sock->sk;
867 struct sock *newsk;
868 struct sk_buff *skb;
869 int rc = -EINVAL;
870
871 if (!sk)
872 goto out;
873
874 rc = -EOPNOTSUPP;
875 if (sk->sk_type != SOCK_SEQPACKET)
876 goto out;
877
878 lock_sock(sk);
879 rc = -EINVAL;
880 if (sk->sk_state != TCP_LISTEN)
881 goto out2;
882
883 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
884 if (rc)
885 goto out2;
886 skb = skb_dequeue(&sk->sk_receive_queue);
887 rc = -EINVAL;
888 if (!skb->sk)
889 goto out2;
890 newsk = skb->sk;
891 sock_graft(newsk, newsock);
892
893
894 skb->sk = NULL;
895 kfree_skb(skb);
896 sk_acceptq_removed(sk);
897 newsock->state = SS_CONNECTED;
898 rc = 0;
899out2:
900 release_sock(sk);
901out:
902 return rc;
903}
904
905static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
906 int peer)
907{
908 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
909 struct sock *sk = sock->sk;
910 struct x25_sock *x25 = x25_sk(sk);
911 int rc = 0;
912
913 if (peer) {
914 if (sk->sk_state != TCP_ESTABLISHED) {
915 rc = -ENOTCONN;
916 goto out;
917 }
918 sx25->sx25_addr = x25->dest_addr;
919 } else
920 sx25->sx25_addr = x25->source_addr;
921
922 sx25->sx25_family = AF_X25;
923 rc = sizeof(*sx25);
924
925out:
926 return rc;
927}
928
929int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
930 unsigned int lci)
931{
932 struct sock *sk;
933 struct sock *make;
934 struct x25_sock *makex25;
935 struct x25_address source_addr, dest_addr;
936 struct x25_facilities facilities;
937 struct x25_dte_facilities dte_facilities;
938 int len, addr_len, rc;
939
940
941
942
943 skb_pull(skb, X25_STD_MIN_LEN);
944
945
946
947
948
949
950
951 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
952 if (addr_len <= 0)
953 goto out_clear_request;
954 skb_pull(skb, addr_len);
955
956
957
958
959
960
961
962
963 if (!pskb_may_pull(skb, 1))
964 goto out_clear_request;
965 len = skb->data[0] + 1;
966 if (!pskb_may_pull(skb, len))
967 goto out_clear_request;
968 skb_pull(skb,len);
969
970
971
972
973 if (skb->len > X25_MAX_CUD_LEN)
974 goto out_clear_request;
975
976
977
978
979
980 if (!pskb_may_pull(skb, skb->len))
981 goto out_clear_request;
982
983
984
985
986 sk = x25_find_listener(&source_addr,skb);
987 skb_push(skb,len);
988
989 if (sk != NULL && sk_acceptq_is_full(sk)) {
990 goto out_sock_put;
991 }
992
993
994
995
996
997 if (sk == NULL) {
998 skb_push(skb, addr_len + X25_STD_MIN_LEN);
999 if (sysctl_x25_forward &&
1000 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1001 {
1002
1003 kfree_skb(skb);
1004 rc = 1;
1005 goto out;
1006 } else {
1007
1008 goto out_clear_request;
1009 }
1010 }
1011
1012
1013
1014
1015 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1016 if (len == -1)
1017 goto out_sock_put;
1018
1019
1020
1021
1022
1023
1024 x25_limit_facilities(&facilities, nb);
1025
1026
1027
1028
1029 make = x25_make_new(sk);
1030 if (!make)
1031 goto out_sock_put;
1032
1033
1034
1035
1036 skb_pull(skb, len);
1037
1038 skb->sk = make;
1039 make->sk_state = TCP_ESTABLISHED;
1040
1041 makex25 = x25_sk(make);
1042 makex25->lci = lci;
1043 makex25->dest_addr = dest_addr;
1044 makex25->source_addr = source_addr;
1045 x25_neigh_hold(nb);
1046 makex25->neighbour = nb;
1047 makex25->facilities = facilities;
1048 makex25->dte_facilities= dte_facilities;
1049 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1050
1051 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1052
1053 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1054 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1055
1056
1057 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1058 x25_write_internal(make, X25_CALL_ACCEPTED);
1059 makex25->state = X25_STATE_3;
1060 } else {
1061 makex25->state = X25_STATE_5;
1062 }
1063
1064
1065
1066
1067 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1068 makex25->calluserdata.cudlength = skb->len;
1069
1070 sk_acceptq_added(sk);
1071
1072 x25_insert_socket(make);
1073
1074 skb_queue_head(&sk->sk_receive_queue, skb);
1075
1076 x25_start_heartbeat(make);
1077
1078 if (!sock_flag(sk, SOCK_DEAD))
1079 sk->sk_data_ready(sk);
1080 rc = 1;
1081 sock_put(sk);
1082out:
1083 return rc;
1084out_sock_put:
1085 sock_put(sk);
1086out_clear_request:
1087 rc = 0;
1088 x25_transmit_clear_request(nb, lci, 0x01);
1089 goto out;
1090}
1091
1092static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1093{
1094 struct sock *sk = sock->sk;
1095 struct x25_sock *x25 = x25_sk(sk);
1096 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1097 struct sockaddr_x25 sx25;
1098 struct sk_buff *skb;
1099 unsigned char *asmptr;
1100 int noblock = msg->msg_flags & MSG_DONTWAIT;
1101 size_t size;
1102 int qbit = 0, rc = -EINVAL;
1103
1104 lock_sock(sk);
1105 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1106 goto out;
1107
1108
1109 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1110 goto out;
1111
1112 rc = -EADDRNOTAVAIL;
1113 if (sock_flag(sk, SOCK_ZAPPED))
1114 goto out;
1115
1116 rc = -EPIPE;
1117 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1118 send_sig(SIGPIPE, current, 0);
1119 goto out;
1120 }
1121
1122 rc = -ENETUNREACH;
1123 if (!x25->neighbour)
1124 goto out;
1125
1126 if (usx25) {
1127 rc = -EINVAL;
1128 if (msg->msg_namelen < sizeof(sx25))
1129 goto out;
1130 memcpy(&sx25, usx25, sizeof(sx25));
1131 rc = -EISCONN;
1132 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1133 goto out;
1134 rc = -EINVAL;
1135 if (sx25.sx25_family != AF_X25)
1136 goto out;
1137 } else {
1138
1139
1140
1141
1142
1143 rc = -ENOTCONN;
1144 if (sk->sk_state != TCP_ESTABLISHED)
1145 goto out;
1146
1147 sx25.sx25_family = AF_X25;
1148 sx25.sx25_addr = x25->dest_addr;
1149 }
1150
1151
1152 if (len > 65535) {
1153 rc = -EMSGSIZE;
1154 goto out;
1155 }
1156
1157 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1158
1159
1160 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1161
1162 if ((msg->msg_flags & MSG_OOB) && len > 32)
1163 len = 32;
1164
1165 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1166
1167 release_sock(sk);
1168 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1169 lock_sock(sk);
1170 if (!skb)
1171 goto out;
1172 X25_SKB_CB(skb)->flags = msg->msg_flags;
1173
1174 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1175
1176
1177
1178
1179 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1180
1181 skb_reset_transport_header(skb);
1182 skb_put(skb, len);
1183
1184 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1185 if (rc)
1186 goto out_kfree_skb;
1187
1188
1189
1190
1191
1192 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1193 if (!pskb_may_pull(skb, 1))
1194 goto out_kfree_skb;
1195
1196 qbit = skb->data[0];
1197 skb_pull(skb, 1);
1198 }
1199
1200
1201
1202
1203 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1204
1205 if (msg->msg_flags & MSG_OOB) {
1206 if (x25->neighbour->extended) {
1207 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1208 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1209 *asmptr++ = (x25->lci >> 0) & 0xFF;
1210 *asmptr++ = X25_INTERRUPT;
1211 } else {
1212 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1213 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1214 *asmptr++ = (x25->lci >> 0) & 0xFF;
1215 *asmptr++ = X25_INTERRUPT;
1216 }
1217 } else {
1218 if (x25->neighbour->extended) {
1219
1220 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1221 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1222 *asmptr++ = (x25->lci >> 0) & 0xFF;
1223 *asmptr++ = X25_DATA;
1224 *asmptr++ = X25_DATA;
1225 } else {
1226
1227 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1228 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1229 *asmptr++ = (x25->lci >> 0) & 0xFF;
1230 *asmptr++ = X25_DATA;
1231 }
1232
1233 if (qbit)
1234 skb->data[0] |= X25_Q_BIT;
1235 }
1236
1237 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1238 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1239
1240 rc = -ENOTCONN;
1241 if (sk->sk_state != TCP_ESTABLISHED)
1242 goto out_kfree_skb;
1243
1244 if (msg->msg_flags & MSG_OOB)
1245 skb_queue_tail(&x25->interrupt_out_queue, skb);
1246 else {
1247 rc = x25_output(sk, skb);
1248 len = rc;
1249 if (rc < 0)
1250 kfree_skb(skb);
1251 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1252 len++;
1253 }
1254
1255 x25_kick(sk);
1256 rc = len;
1257out:
1258 release_sock(sk);
1259 return rc;
1260out_kfree_skb:
1261 kfree_skb(skb);
1262 goto out;
1263}
1264
1265
1266static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1267 int flags)
1268{
1269 struct sock *sk = sock->sk;
1270 struct x25_sock *x25 = x25_sk(sk);
1271 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1272 size_t copied;
1273 int qbit, header_len;
1274 struct sk_buff *skb;
1275 unsigned char *asmptr;
1276 int rc = -ENOTCONN;
1277
1278 lock_sock(sk);
1279
1280 if (x25->neighbour == NULL)
1281 goto out;
1282
1283 header_len = x25->neighbour->extended ?
1284 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1285
1286
1287
1288
1289
1290 if (sk->sk_state != TCP_ESTABLISHED)
1291 goto out;
1292
1293 if (flags & MSG_OOB) {
1294 rc = -EINVAL;
1295 if (sock_flag(sk, SOCK_URGINLINE) ||
1296 !skb_peek(&x25->interrupt_in_queue))
1297 goto out;
1298
1299 skb = skb_dequeue(&x25->interrupt_in_queue);
1300
1301 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1302 goto out_free_dgram;
1303
1304 skb_pull(skb, X25_STD_MIN_LEN);
1305
1306
1307
1308
1309 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1310 asmptr = skb_push(skb, 1);
1311 *asmptr = 0x00;
1312 }
1313
1314 msg->msg_flags |= MSG_OOB;
1315 } else {
1316
1317 release_sock(sk);
1318 skb = skb_recv_datagram(sk, flags, &rc);
1319 lock_sock(sk);
1320 if (!skb)
1321 goto out;
1322
1323 if (!pskb_may_pull(skb, header_len))
1324 goto out_free_dgram;
1325
1326 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1327
1328 skb_pull(skb, header_len);
1329
1330 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1331 asmptr = skb_push(skb, 1);
1332 *asmptr = qbit;
1333 }
1334 }
1335
1336 skb_reset_transport_header(skb);
1337 copied = skb->len;
1338
1339 if (copied > size) {
1340 copied = size;
1341 msg->msg_flags |= MSG_TRUNC;
1342 }
1343
1344
1345 msg->msg_flags |= MSG_EOR;
1346
1347 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1348 if (rc)
1349 goto out_free_dgram;
1350
1351 if (sx25) {
1352 sx25->sx25_family = AF_X25;
1353 sx25->sx25_addr = x25->dest_addr;
1354 msg->msg_namelen = sizeof(*sx25);
1355 }
1356
1357 x25_check_rbuf(sk);
1358 rc = copied;
1359out_free_dgram:
1360 skb_free_datagram(sk, skb);
1361out:
1362 release_sock(sk);
1363 return rc;
1364}
1365
1366
1367static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1368{
1369 struct sock *sk = sock->sk;
1370 struct x25_sock *x25 = x25_sk(sk);
1371 void __user *argp = (void __user *)arg;
1372 int rc;
1373
1374 switch (cmd) {
1375 case TIOCOUTQ: {
1376 int amount;
1377
1378 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1379 if (amount < 0)
1380 amount = 0;
1381 rc = put_user(amount, (unsigned int __user *)argp);
1382 break;
1383 }
1384
1385 case TIOCINQ: {
1386 struct sk_buff *skb;
1387 int amount = 0;
1388
1389
1390
1391
1392 lock_sock(sk);
1393 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1394 amount = skb->len;
1395 release_sock(sk);
1396 rc = put_user(amount, (unsigned int __user *)argp);
1397 break;
1398 }
1399
1400 case SIOCGIFADDR:
1401 case SIOCSIFADDR:
1402 case SIOCGIFDSTADDR:
1403 case SIOCSIFDSTADDR:
1404 case SIOCGIFBRDADDR:
1405 case SIOCSIFBRDADDR:
1406 case SIOCGIFNETMASK:
1407 case SIOCSIFNETMASK:
1408 case SIOCGIFMETRIC:
1409 case SIOCSIFMETRIC:
1410 rc = -EINVAL;
1411 break;
1412 case SIOCADDRT:
1413 case SIOCDELRT:
1414 rc = -EPERM;
1415 if (!capable(CAP_NET_ADMIN))
1416 break;
1417 rc = x25_route_ioctl(cmd, argp);
1418 break;
1419 case SIOCX25GSUBSCRIP:
1420 rc = x25_subscr_ioctl(cmd, argp);
1421 break;
1422 case SIOCX25SSUBSCRIP:
1423 rc = -EPERM;
1424 if (!capable(CAP_NET_ADMIN))
1425 break;
1426 rc = x25_subscr_ioctl(cmd, argp);
1427 break;
1428 case SIOCX25GFACILITIES: {
1429 lock_sock(sk);
1430 rc = copy_to_user(argp, &x25->facilities,
1431 sizeof(x25->facilities))
1432 ? -EFAULT : 0;
1433 release_sock(sk);
1434 break;
1435 }
1436
1437 case SIOCX25SFACILITIES: {
1438 struct x25_facilities facilities;
1439 rc = -EFAULT;
1440 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1441 break;
1442 rc = -EINVAL;
1443 lock_sock(sk);
1444 if (sk->sk_state != TCP_LISTEN &&
1445 sk->sk_state != TCP_CLOSE)
1446 goto out_fac_release;
1447 if (facilities.pacsize_in < X25_PS16 ||
1448 facilities.pacsize_in > X25_PS4096)
1449 goto out_fac_release;
1450 if (facilities.pacsize_out < X25_PS16 ||
1451 facilities.pacsize_out > X25_PS4096)
1452 goto out_fac_release;
1453 if (facilities.winsize_in < 1 ||
1454 facilities.winsize_in > 127)
1455 goto out_fac_release;
1456 if (facilities.throughput) {
1457 int out = facilities.throughput & 0xf0;
1458 int in = facilities.throughput & 0x0f;
1459 if (!out)
1460 facilities.throughput |=
1461 X25_DEFAULT_THROUGHPUT << 4;
1462 else if (out < 0x30 || out > 0xD0)
1463 goto out_fac_release;
1464 if (!in)
1465 facilities.throughput |=
1466 X25_DEFAULT_THROUGHPUT;
1467 else if (in < 0x03 || in > 0x0D)
1468 goto out_fac_release;
1469 }
1470 if (facilities.reverse &&
1471 (facilities.reverse & 0x81) != 0x81)
1472 goto out_fac_release;
1473 x25->facilities = facilities;
1474 rc = 0;
1475out_fac_release:
1476 release_sock(sk);
1477 break;
1478 }
1479
1480 case SIOCX25GDTEFACILITIES: {
1481 lock_sock(sk);
1482 rc = copy_to_user(argp, &x25->dte_facilities,
1483 sizeof(x25->dte_facilities));
1484 release_sock(sk);
1485 if (rc)
1486 rc = -EFAULT;
1487 break;
1488 }
1489
1490 case SIOCX25SDTEFACILITIES: {
1491 struct x25_dte_facilities dtefacs;
1492 rc = -EFAULT;
1493 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1494 break;
1495 rc = -EINVAL;
1496 lock_sock(sk);
1497 if (sk->sk_state != TCP_LISTEN &&
1498 sk->sk_state != TCP_CLOSE)
1499 goto out_dtefac_release;
1500 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1501 goto out_dtefac_release;
1502 if (dtefacs.called_len > X25_MAX_AE_LEN)
1503 goto out_dtefac_release;
1504 x25->dte_facilities = dtefacs;
1505 rc = 0;
1506out_dtefac_release:
1507 release_sock(sk);
1508 break;
1509 }
1510
1511 case SIOCX25GCALLUSERDATA: {
1512 lock_sock(sk);
1513 rc = copy_to_user(argp, &x25->calluserdata,
1514 sizeof(x25->calluserdata))
1515 ? -EFAULT : 0;
1516 release_sock(sk);
1517 break;
1518 }
1519
1520 case SIOCX25SCALLUSERDATA: {
1521 struct x25_calluserdata calluserdata;
1522
1523 rc = -EFAULT;
1524 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1525 break;
1526 rc = -EINVAL;
1527 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1528 break;
1529 lock_sock(sk);
1530 x25->calluserdata = calluserdata;
1531 release_sock(sk);
1532 rc = 0;
1533 break;
1534 }
1535
1536 case SIOCX25GCAUSEDIAG: {
1537 lock_sock(sk);
1538 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1539 ? -EFAULT : 0;
1540 release_sock(sk);
1541 break;
1542 }
1543
1544 case SIOCX25SCAUSEDIAG: {
1545 struct x25_causediag causediag;
1546 rc = -EFAULT;
1547 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1548 break;
1549 lock_sock(sk);
1550 x25->causediag = causediag;
1551 release_sock(sk);
1552 rc = 0;
1553 break;
1554
1555 }
1556
1557 case SIOCX25SCUDMATCHLEN: {
1558 struct x25_subaddr sub_addr;
1559 rc = -EINVAL;
1560 lock_sock(sk);
1561 if(sk->sk_state != TCP_CLOSE)
1562 goto out_cud_release;
1563 rc = -EFAULT;
1564 if (copy_from_user(&sub_addr, argp,
1565 sizeof(sub_addr)))
1566 goto out_cud_release;
1567 rc = -EINVAL;
1568 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1569 goto out_cud_release;
1570 x25->cudmatchlength = sub_addr.cudmatchlength;
1571 rc = 0;
1572out_cud_release:
1573 release_sock(sk);
1574 break;
1575 }
1576
1577 case SIOCX25CALLACCPTAPPRV: {
1578 rc = -EINVAL;
1579 lock_sock(sk);
1580 if (sk->sk_state == TCP_CLOSE) {
1581 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1582 rc = 0;
1583 }
1584 release_sock(sk);
1585 break;
1586 }
1587
1588 case SIOCX25SENDCALLACCPT: {
1589 rc = -EINVAL;
1590 lock_sock(sk);
1591 if (sk->sk_state != TCP_ESTABLISHED)
1592 goto out_sendcallaccpt_release;
1593
1594 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1595 goto out_sendcallaccpt_release;
1596 x25_write_internal(sk, X25_CALL_ACCEPTED);
1597 x25->state = X25_STATE_3;
1598 rc = 0;
1599out_sendcallaccpt_release:
1600 release_sock(sk);
1601 break;
1602 }
1603
1604 default:
1605 rc = -ENOIOCTLCMD;
1606 break;
1607 }
1608
1609 return rc;
1610}
1611
1612static const struct net_proto_family x25_family_ops = {
1613 .family = AF_X25,
1614 .create = x25_create,
1615 .owner = THIS_MODULE,
1616};
1617
1618#ifdef CONFIG_COMPAT
1619static int compat_x25_subscr_ioctl(unsigned int cmd,
1620 struct compat_x25_subscrip_struct __user *x25_subscr32)
1621{
1622 struct compat_x25_subscrip_struct x25_subscr;
1623 struct x25_neigh *nb;
1624 struct net_device *dev;
1625 int rc = -EINVAL;
1626
1627 rc = -EFAULT;
1628 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1629 goto out;
1630
1631 rc = -EINVAL;
1632 dev = x25_dev_get(x25_subscr.device);
1633 if (dev == NULL)
1634 goto out;
1635
1636 nb = x25_get_neigh(dev);
1637 if (nb == NULL)
1638 goto out_dev_put;
1639
1640 dev_put(dev);
1641
1642 if (cmd == SIOCX25GSUBSCRIP) {
1643 read_lock_bh(&x25_neigh_list_lock);
1644 x25_subscr.extended = nb->extended;
1645 x25_subscr.global_facil_mask = nb->global_facil_mask;
1646 read_unlock_bh(&x25_neigh_list_lock);
1647 rc = copy_to_user(x25_subscr32, &x25_subscr,
1648 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1649 } else {
1650 rc = -EINVAL;
1651 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1652 rc = 0;
1653 write_lock_bh(&x25_neigh_list_lock);
1654 nb->extended = x25_subscr.extended;
1655 nb->global_facil_mask = x25_subscr.global_facil_mask;
1656 write_unlock_bh(&x25_neigh_list_lock);
1657 }
1658 }
1659 x25_neigh_put(nb);
1660out:
1661 return rc;
1662out_dev_put:
1663 dev_put(dev);
1664 goto out;
1665}
1666
1667static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1668 unsigned long arg)
1669{
1670 void __user *argp = compat_ptr(arg);
1671 int rc = -ENOIOCTLCMD;
1672
1673 switch(cmd) {
1674 case TIOCOUTQ:
1675 case TIOCINQ:
1676 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1677 break;
1678 case SIOCGIFADDR:
1679 case SIOCSIFADDR:
1680 case SIOCGIFDSTADDR:
1681 case SIOCSIFDSTADDR:
1682 case SIOCGIFBRDADDR:
1683 case SIOCSIFBRDADDR:
1684 case SIOCGIFNETMASK:
1685 case SIOCSIFNETMASK:
1686 case SIOCGIFMETRIC:
1687 case SIOCSIFMETRIC:
1688 rc = -EINVAL;
1689 break;
1690 case SIOCADDRT:
1691 case SIOCDELRT:
1692 rc = -EPERM;
1693 if (!capable(CAP_NET_ADMIN))
1694 break;
1695 rc = x25_route_ioctl(cmd, argp);
1696 break;
1697 case SIOCX25GSUBSCRIP:
1698 rc = compat_x25_subscr_ioctl(cmd, argp);
1699 break;
1700 case SIOCX25SSUBSCRIP:
1701 rc = -EPERM;
1702 if (!capable(CAP_NET_ADMIN))
1703 break;
1704 rc = compat_x25_subscr_ioctl(cmd, argp);
1705 break;
1706 case SIOCX25GFACILITIES:
1707 case SIOCX25SFACILITIES:
1708 case SIOCX25GDTEFACILITIES:
1709 case SIOCX25SDTEFACILITIES:
1710 case SIOCX25GCALLUSERDATA:
1711 case SIOCX25SCALLUSERDATA:
1712 case SIOCX25GCAUSEDIAG:
1713 case SIOCX25SCAUSEDIAG:
1714 case SIOCX25SCUDMATCHLEN:
1715 case SIOCX25CALLACCPTAPPRV:
1716 case SIOCX25SENDCALLACCPT:
1717 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1718 break;
1719 default:
1720 rc = -ENOIOCTLCMD;
1721 break;
1722 }
1723 return rc;
1724}
1725#endif
1726
1727static const struct proto_ops x25_proto_ops = {
1728 .family = AF_X25,
1729 .owner = THIS_MODULE,
1730 .release = x25_release,
1731 .bind = x25_bind,
1732 .connect = x25_connect,
1733 .socketpair = sock_no_socketpair,
1734 .accept = x25_accept,
1735 .getname = x25_getname,
1736 .poll = datagram_poll,
1737 .ioctl = x25_ioctl,
1738#ifdef CONFIG_COMPAT
1739 .compat_ioctl = compat_x25_ioctl,
1740#endif
1741 .gettstamp = sock_gettstamp,
1742 .listen = x25_listen,
1743 .shutdown = sock_no_shutdown,
1744 .setsockopt = x25_setsockopt,
1745 .getsockopt = x25_getsockopt,
1746 .sendmsg = x25_sendmsg,
1747 .recvmsg = x25_recvmsg,
1748 .mmap = sock_no_mmap,
1749 .sendpage = sock_no_sendpage,
1750};
1751
1752static struct packet_type x25_packet_type __read_mostly = {
1753 .type = cpu_to_be16(ETH_P_X25),
1754 .func = x25_lapb_receive_frame,
1755};
1756
1757static struct notifier_block x25_dev_notifier = {
1758 .notifier_call = x25_device_event,
1759};
1760
1761void x25_kill_by_neigh(struct x25_neigh *nb)
1762{
1763 struct sock *s;
1764
1765 write_lock_bh(&x25_list_lock);
1766
1767 sk_for_each(s, &x25_list) {
1768 if (x25_sk(s)->neighbour == nb) {
1769 write_unlock_bh(&x25_list_lock);
1770 lock_sock(s);
1771 x25_disconnect(s, ENETUNREACH, 0, 0);
1772 release_sock(s);
1773 write_lock_bh(&x25_list_lock);
1774 }
1775 }
1776 write_unlock_bh(&x25_list_lock);
1777
1778
1779 x25_clear_forward_by_dev(nb->dev);
1780}
1781
1782static int __init x25_init(void)
1783{
1784 int rc;
1785
1786 rc = proto_register(&x25_proto, 0);
1787 if (rc)
1788 goto out;
1789
1790 rc = sock_register(&x25_family_ops);
1791 if (rc)
1792 goto out_proto;
1793
1794 dev_add_pack(&x25_packet_type);
1795
1796 rc = register_netdevice_notifier(&x25_dev_notifier);
1797 if (rc)
1798 goto out_sock;
1799
1800 rc = x25_register_sysctl();
1801 if (rc)
1802 goto out_dev;
1803
1804 rc = x25_proc_init();
1805 if (rc)
1806 goto out_sysctl;
1807
1808 pr_info("Linux Version 0.2\n");
1809
1810out:
1811 return rc;
1812out_sysctl:
1813 x25_unregister_sysctl();
1814out_dev:
1815 unregister_netdevice_notifier(&x25_dev_notifier);
1816out_sock:
1817 dev_remove_pack(&x25_packet_type);
1818 sock_unregister(AF_X25);
1819out_proto:
1820 proto_unregister(&x25_proto);
1821 goto out;
1822}
1823module_init(x25_init);
1824
1825static void __exit x25_exit(void)
1826{
1827 x25_proc_exit();
1828 x25_link_free();
1829 x25_route_free();
1830
1831 x25_unregister_sysctl();
1832
1833 unregister_netdevice_notifier(&x25_dev_notifier);
1834
1835 dev_remove_pack(&x25_packet_type);
1836
1837 sock_unregister(AF_X25);
1838 proto_unregister(&x25_proto);
1839}
1840module_exit(x25_exit);
1841
1842MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1843MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1844MODULE_LICENSE("GPL");
1845MODULE_ALIAS_NETPROTO(PF_X25);
1846
