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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 void x25_kill_by_device(struct net_device *dev)
206{
207 struct sock *s;
208
209 write_lock_bh(&x25_list_lock);
210
211 sk_for_each(s, &x25_list)
212 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
213 x25_disconnect(s, ENETUNREACH, 0, 0);
214
215 write_unlock_bh(&x25_list_lock);
216}
217
218
219
220
221static int x25_device_event(struct notifier_block *this, unsigned long event,
222 void *ptr)
223{
224 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
225 struct x25_neigh *nb;
226
227 if (!net_eq(dev_net(dev), &init_net))
228 return NOTIFY_DONE;
229
230 if (dev->type == ARPHRD_X25
231#if IS_ENABLED(CONFIG_LLC)
232 || dev->type == ARPHRD_ETHER
233#endif
234 ) {
235 switch (event) {
236 case NETDEV_UP:
237 x25_link_device_up(dev);
238 break;
239 case NETDEV_GOING_DOWN:
240 nb = x25_get_neigh(dev);
241 if (nb) {
242 x25_terminate_link(nb);
243 x25_neigh_put(nb);
244 }
245 break;
246 case NETDEV_DOWN:
247 x25_kill_by_device(dev);
248 x25_route_device_down(dev);
249 x25_link_device_down(dev);
250 break;
251 }
252 }
253
254 return NOTIFY_DONE;
255}
256
257
258
259
260static void x25_insert_socket(struct sock *sk)
261{
262 write_lock_bh(&x25_list_lock);
263 sk_add_node(sk, &x25_list);
264 write_unlock_bh(&x25_list_lock);
265}
266
267
268
269
270
271
272
273
274static struct sock *x25_find_listener(struct x25_address *addr,
275 struct sk_buff *skb)
276{
277 struct sock *s;
278 struct sock *next_best;
279
280 read_lock_bh(&x25_list_lock);
281 next_best = NULL;
282
283 sk_for_each(s, &x25_list)
284 if ((!strcmp(addr->x25_addr,
285 x25_sk(s)->source_addr.x25_addr) ||
286 !strcmp(x25_sk(s)->source_addr.x25_addr,
287 null_x25_address.x25_addr)) &&
288 s->sk_state == TCP_LISTEN) {
289
290
291
292
293 if (x25_sk(s)->cudmatchlength > 0 &&
294 skb->len >= x25_sk(s)->cudmatchlength) {
295 if((memcmp(x25_sk(s)->calluserdata.cuddata,
296 skb->data,
297 x25_sk(s)->cudmatchlength)) == 0) {
298 sock_hold(s);
299 goto found;
300 }
301 } else
302 next_best = s;
303 }
304 if (next_best) {
305 s = next_best;
306 sock_hold(s);
307 goto found;
308 }
309 s = NULL;
310found:
311 read_unlock_bh(&x25_list_lock);
312 return s;
313}
314
315
316
317
318static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
319{
320 struct sock *s;
321
322 sk_for_each(s, &x25_list)
323 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
324 sock_hold(s);
325 goto found;
326 }
327 s = NULL;
328found:
329 return s;
330}
331
332struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
333{
334 struct sock *s;
335
336 read_lock_bh(&x25_list_lock);
337 s = __x25_find_socket(lci, nb);
338 read_unlock_bh(&x25_list_lock);
339 return s;
340}
341
342
343
344
345static unsigned int x25_new_lci(struct x25_neigh *nb)
346{
347 unsigned int lci = 1;
348 struct sock *sk;
349
350 while ((sk = x25_find_socket(lci, nb)) != NULL) {
351 sock_put(sk);
352 if (++lci == 4096) {
353 lci = 0;
354 break;
355 }
356 cond_resched();
357 }
358
359 return lci;
360}
361
362
363
364
365static void __x25_destroy_socket(struct sock *);
366
367
368
369
370static void x25_destroy_timer(struct timer_list *t)
371{
372 struct sock *sk = from_timer(sk, t, sk_timer);
373
374 x25_destroy_socket_from_timer(sk);
375}
376
377
378
379
380
381
382
383
384static void __x25_destroy_socket(struct sock *sk)
385{
386 struct sk_buff *skb;
387
388 x25_stop_heartbeat(sk);
389 x25_stop_timer(sk);
390
391 x25_remove_socket(sk);
392 x25_clear_queues(sk);
393
394 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
395 if (skb->sk != sk) {
396
397
398
399 skb->sk->sk_state = TCP_LISTEN;
400 sock_set_flag(skb->sk, SOCK_DEAD);
401 x25_start_heartbeat(skb->sk);
402 x25_sk(skb->sk)->state = X25_STATE_0;
403 }
404
405 kfree_skb(skb);
406 }
407
408 if (sk_has_allocations(sk)) {
409
410 sk->sk_timer.expires = jiffies + 10 * HZ;
411 sk->sk_timer.function = x25_destroy_timer;
412 add_timer(&sk->sk_timer);
413 } else {
414
415 __sock_put(sk);
416 }
417}
418
419void x25_destroy_socket_from_timer(struct sock *sk)
420{
421 sock_hold(sk);
422 bh_lock_sock(sk);
423 __x25_destroy_socket(sk);
424 bh_unlock_sock(sk);
425 sock_put(sk);
426}
427
428
429
430
431
432
433static int x25_setsockopt(struct socket *sock, int level, int optname,
434 char __user *optval, unsigned int optlen)
435{
436 int opt;
437 struct sock *sk = sock->sk;
438 int rc = -ENOPROTOOPT;
439
440 if (level != SOL_X25 || optname != X25_QBITINCL)
441 goto out;
442
443 rc = -EINVAL;
444 if (optlen < sizeof(int))
445 goto out;
446
447 rc = -EFAULT;
448 if (get_user(opt, (int __user *)optval))
449 goto out;
450
451 if (opt)
452 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
453 else
454 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
455 rc = 0;
456out:
457 return rc;
458}
459
460static int x25_getsockopt(struct socket *sock, int level, int optname,
461 char __user *optval, int __user *optlen)
462{
463 struct sock *sk = sock->sk;
464 int val, len, rc = -ENOPROTOOPT;
465
466 if (level != SOL_X25 || optname != X25_QBITINCL)
467 goto out;
468
469 rc = -EFAULT;
470 if (get_user(len, optlen))
471 goto out;
472
473 len = min_t(unsigned int, len, sizeof(int));
474
475 rc = -EINVAL;
476 if (len < 0)
477 goto out;
478
479 rc = -EFAULT;
480 if (put_user(len, optlen))
481 goto out;
482
483 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
484 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
485out:
486 return rc;
487}
488
489static int x25_listen(struct socket *sock, int backlog)
490{
491 struct sock *sk = sock->sk;
492 int rc = -EOPNOTSUPP;
493
494 lock_sock(sk);
495 if (sk->sk_state != TCP_LISTEN) {
496 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
497 sk->sk_max_ack_backlog = backlog;
498 sk->sk_state = TCP_LISTEN;
499 rc = 0;
500 }
501 release_sock(sk);
502
503 return rc;
504}
505
506static struct proto x25_proto = {
507 .name = "X25",
508 .owner = THIS_MODULE,
509 .obj_size = sizeof(struct x25_sock),
510};
511
512static struct sock *x25_alloc_socket(struct net *net, int kern)
513{
514 struct x25_sock *x25;
515 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
516
517 if (!sk)
518 goto out;
519
520 sock_init_data(NULL, sk);
521
522 x25 = x25_sk(sk);
523 skb_queue_head_init(&x25->ack_queue);
524 skb_queue_head_init(&x25->fragment_queue);
525 skb_queue_head_init(&x25->interrupt_in_queue);
526 skb_queue_head_init(&x25->interrupt_out_queue);
527out:
528 return sk;
529}
530
531static int x25_create(struct net *net, struct socket *sock, int protocol,
532 int kern)
533{
534 struct sock *sk;
535 struct x25_sock *x25;
536 int rc = -EAFNOSUPPORT;
537
538 if (!net_eq(net, &init_net))
539 goto out;
540
541 rc = -ESOCKTNOSUPPORT;
542 if (sock->type != SOCK_SEQPACKET)
543 goto out;
544
545 rc = -EINVAL;
546 if (protocol)
547 goto out;
548
549 rc = -ENOBUFS;
550 if ((sk = x25_alloc_socket(net, kern)) == NULL)
551 goto out;
552
553 x25 = x25_sk(sk);
554
555 sock_init_data(sock, sk);
556
557 x25_init_timers(sk);
558
559 sock->ops = &x25_proto_ops;
560 sk->sk_protocol = protocol;
561 sk->sk_backlog_rcv = x25_backlog_rcv;
562
563 x25->t21 = sysctl_x25_call_request_timeout;
564 x25->t22 = sysctl_x25_reset_request_timeout;
565 x25->t23 = sysctl_x25_clear_request_timeout;
566 x25->t2 = sysctl_x25_ack_holdback_timeout;
567 x25->state = X25_STATE_0;
568 x25->cudmatchlength = 0;
569 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
570
571
572 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
573 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
574 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
575 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
576 x25->facilities.throughput = 0;
577
578 x25->facilities.reverse = X25_DEFAULT_REVERSE;
579 x25->dte_facilities.calling_len = 0;
580 x25->dte_facilities.called_len = 0;
581 memset(x25->dte_facilities.called_ae, '\0',
582 sizeof(x25->dte_facilities.called_ae));
583 memset(x25->dte_facilities.calling_ae, '\0',
584 sizeof(x25->dte_facilities.calling_ae));
585
586 rc = 0;
587out:
588 return rc;
589}
590
591static struct sock *x25_make_new(struct sock *osk)
592{
593 struct sock *sk = NULL;
594 struct x25_sock *x25, *ox25;
595
596 if (osk->sk_type != SOCK_SEQPACKET)
597 goto out;
598
599 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
600 goto out;
601
602 x25 = x25_sk(sk);
603
604 sk->sk_type = osk->sk_type;
605 sk->sk_priority = osk->sk_priority;
606 sk->sk_protocol = osk->sk_protocol;
607 sk->sk_rcvbuf = osk->sk_rcvbuf;
608 sk->sk_sndbuf = osk->sk_sndbuf;
609 sk->sk_state = TCP_ESTABLISHED;
610 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
611 sock_copy_flags(sk, osk);
612
613 ox25 = x25_sk(osk);
614 x25->t21 = ox25->t21;
615 x25->t22 = ox25->t22;
616 x25->t23 = ox25->t23;
617 x25->t2 = ox25->t2;
618 x25->flags = ox25->flags;
619 x25->facilities = ox25->facilities;
620 x25->dte_facilities = ox25->dte_facilities;
621 x25->cudmatchlength = ox25->cudmatchlength;
622
623 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
624 x25_init_timers(sk);
625out:
626 return sk;
627}
628
629static int x25_release(struct socket *sock)
630{
631 struct sock *sk = sock->sk;
632 struct x25_sock *x25;
633
634 if (!sk)
635 return 0;
636
637 x25 = x25_sk(sk);
638
639 sock_hold(sk);
640 lock_sock(sk);
641 switch (x25->state) {
642
643 case X25_STATE_0:
644 case X25_STATE_2:
645 x25_disconnect(sk, 0, 0, 0);
646 __x25_destroy_socket(sk);
647 goto out;
648
649 case X25_STATE_1:
650 case X25_STATE_3:
651 case X25_STATE_4:
652 x25_clear_queues(sk);
653 x25_write_internal(sk, X25_CLEAR_REQUEST);
654 x25_start_t23timer(sk);
655 x25->state = X25_STATE_2;
656 sk->sk_state = TCP_CLOSE;
657 sk->sk_shutdown |= SEND_SHUTDOWN;
658 sk->sk_state_change(sk);
659 sock_set_flag(sk, SOCK_DEAD);
660 sock_set_flag(sk, SOCK_DESTROY);
661 break;
662
663 case X25_STATE_5:
664 x25_write_internal(sk, X25_CLEAR_REQUEST);
665 x25_disconnect(sk, 0, 0, 0);
666 __x25_destroy_socket(sk);
667 goto out;
668 }
669
670 sock_orphan(sk);
671out:
672 release_sock(sk);
673 sock_put(sk);
674 return 0;
675}
676
677static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
678{
679 struct sock *sk = sock->sk;
680 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
681 int len, i, rc = 0;
682
683 if (addr_len != sizeof(struct sockaddr_x25) ||
684 addr->sx25_family != AF_X25) {
685 rc = -EINVAL;
686 goto out;
687 }
688
689
690 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
691
692 len = strlen(addr->sx25_addr.x25_addr);
693 for (i = 0; i < len; i++) {
694 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
695 rc = -EINVAL;
696 goto out;
697 }
698 }
699 }
700
701 lock_sock(sk);
702 if (sock_flag(sk, SOCK_ZAPPED)) {
703 x25_sk(sk)->source_addr = addr->sx25_addr;
704 x25_insert_socket(sk);
705 sock_reset_flag(sk, SOCK_ZAPPED);
706 } else {
707 rc = -EINVAL;
708 }
709 release_sock(sk);
710 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
711out:
712 return rc;
713}
714
715static int x25_wait_for_connection_establishment(struct sock *sk)
716{
717 DECLARE_WAITQUEUE(wait, current);
718 int rc;
719
720 add_wait_queue_exclusive(sk_sleep(sk), &wait);
721 for (;;) {
722 __set_current_state(TASK_INTERRUPTIBLE);
723 rc = -ERESTARTSYS;
724 if (signal_pending(current))
725 break;
726 rc = sock_error(sk);
727 if (rc) {
728 sk->sk_socket->state = SS_UNCONNECTED;
729 break;
730 }
731 rc = 0;
732 if (sk->sk_state != TCP_ESTABLISHED) {
733 release_sock(sk);
734 schedule();
735 lock_sock(sk);
736 } else
737 break;
738 }
739 __set_current_state(TASK_RUNNING);
740 remove_wait_queue(sk_sleep(sk), &wait);
741 return rc;
742}
743
744static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
745 int addr_len, int flags)
746{
747 struct sock *sk = sock->sk;
748 struct x25_sock *x25 = x25_sk(sk);
749 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
750 struct x25_route *rt;
751 int rc = 0;
752
753 lock_sock(sk);
754 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
755 sock->state = SS_CONNECTED;
756 goto out;
757 }
758
759 rc = -ECONNREFUSED;
760 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
761 sock->state = SS_UNCONNECTED;
762 goto out;
763 }
764
765 rc = -EISCONN;
766 if (sk->sk_state == TCP_ESTABLISHED)
767 goto out;
768
769 rc = -EALREADY;
770 if (sk->sk_state == TCP_SYN_SENT)
771 goto out;
772
773 sk->sk_state = TCP_CLOSE;
774 sock->state = SS_UNCONNECTED;
775
776 rc = -EINVAL;
777 if (addr_len != sizeof(struct sockaddr_x25) ||
778 addr->sx25_family != AF_X25)
779 goto out;
780
781 rc = -ENETUNREACH;
782 rt = x25_get_route(&addr->sx25_addr);
783 if (!rt)
784 goto out;
785
786 x25->neighbour = x25_get_neigh(rt->dev);
787 if (!x25->neighbour)
788 goto out_put_route;
789
790 x25_limit_facilities(&x25->facilities, x25->neighbour);
791
792 x25->lci = x25_new_lci(x25->neighbour);
793 if (!x25->lci)
794 goto out_put_neigh;
795
796 rc = -EINVAL;
797 if (sock_flag(sk, SOCK_ZAPPED))
798 goto out_put_neigh;
799
800 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
801 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
802
803 x25->dest_addr = addr->sx25_addr;
804
805
806 sock->state = SS_CONNECTING;
807 sk->sk_state = TCP_SYN_SENT;
808
809 x25->state = X25_STATE_1;
810
811 x25_write_internal(sk, X25_CALL_REQUEST);
812
813 x25_start_heartbeat(sk);
814 x25_start_t21timer(sk);
815
816
817 rc = -EINPROGRESS;
818 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
819 goto out;
820
821 rc = x25_wait_for_connection_establishment(sk);
822 if (rc)
823 goto out_put_neigh;
824
825 sock->state = SS_CONNECTED;
826 rc = 0;
827out_put_neigh:
828 if (rc) {
829 read_lock_bh(&x25_list_lock);
830 x25_neigh_put(x25->neighbour);
831 x25->neighbour = NULL;
832 read_unlock_bh(&x25_list_lock);
833 x25->state = X25_STATE_0;
834 }
835out_put_route:
836 x25_route_put(rt);
837out:
838 release_sock(sk);
839 return rc;
840}
841
842static int x25_wait_for_data(struct sock *sk, long timeout)
843{
844 DECLARE_WAITQUEUE(wait, current);
845 int rc = 0;
846
847 add_wait_queue_exclusive(sk_sleep(sk), &wait);
848 for (;;) {
849 __set_current_state(TASK_INTERRUPTIBLE);
850 if (sk->sk_shutdown & RCV_SHUTDOWN)
851 break;
852 rc = -ERESTARTSYS;
853 if (signal_pending(current))
854 break;
855 rc = -EAGAIN;
856 if (!timeout)
857 break;
858 rc = 0;
859 if (skb_queue_empty(&sk->sk_receive_queue)) {
860 release_sock(sk);
861 timeout = schedule_timeout(timeout);
862 lock_sock(sk);
863 } else
864 break;
865 }
866 __set_current_state(TASK_RUNNING);
867 remove_wait_queue(sk_sleep(sk), &wait);
868 return rc;
869}
870
871static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
872 bool kern)
873{
874 struct sock *sk = sock->sk;
875 struct sock *newsk;
876 struct sk_buff *skb;
877 int rc = -EINVAL;
878
879 if (!sk)
880 goto out;
881
882 rc = -EOPNOTSUPP;
883 if (sk->sk_type != SOCK_SEQPACKET)
884 goto out;
885
886 lock_sock(sk);
887 rc = -EINVAL;
888 if (sk->sk_state != TCP_LISTEN)
889 goto out2;
890
891 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
892 if (rc)
893 goto out2;
894 skb = skb_dequeue(&sk->sk_receive_queue);
895 rc = -EINVAL;
896 if (!skb->sk)
897 goto out2;
898 newsk = skb->sk;
899 sock_graft(newsk, newsock);
900
901
902 skb->sk = NULL;
903 kfree_skb(skb);
904 sk_acceptq_removed(sk);
905 newsock->state = SS_CONNECTED;
906 rc = 0;
907out2:
908 release_sock(sk);
909out:
910 return rc;
911}
912
913static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
914 int peer)
915{
916 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
917 struct sock *sk = sock->sk;
918 struct x25_sock *x25 = x25_sk(sk);
919 int rc = 0;
920
921 if (peer) {
922 if (sk->sk_state != TCP_ESTABLISHED) {
923 rc = -ENOTCONN;
924 goto out;
925 }
926 sx25->sx25_addr = x25->dest_addr;
927 } else
928 sx25->sx25_addr = x25->source_addr;
929
930 sx25->sx25_family = AF_X25;
931 rc = sizeof(*sx25);
932
933out:
934 return rc;
935}
936
937int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
938 unsigned int lci)
939{
940 struct sock *sk;
941 struct sock *make;
942 struct x25_sock *makex25;
943 struct x25_address source_addr, dest_addr;
944 struct x25_facilities facilities;
945 struct x25_dte_facilities dte_facilities;
946 int len, addr_len, rc;
947
948
949
950
951 skb_pull(skb, X25_STD_MIN_LEN);
952
953
954
955
956
957
958
959 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
960 if (addr_len <= 0)
961 goto out_clear_request;
962 skb_pull(skb, addr_len);
963
964
965
966
967
968
969
970
971 if (!pskb_may_pull(skb, 1))
972 goto out_clear_request;
973 len = skb->data[0] + 1;
974 if (!pskb_may_pull(skb, len))
975 goto out_clear_request;
976 skb_pull(skb,len);
977
978
979
980
981 if (skb->len > X25_MAX_CUD_LEN)
982 goto out_clear_request;
983
984
985
986
987
988 if (!pskb_may_pull(skb, skb->len))
989 goto out_clear_request;
990
991
992
993
994 sk = x25_find_listener(&source_addr,skb);
995 skb_push(skb,len);
996
997 if (sk != NULL && sk_acceptq_is_full(sk)) {
998 goto out_sock_put;
999 }
1000
1001
1002
1003
1004
1005 if (sk == NULL) {
1006 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1007 if (sysctl_x25_forward &&
1008 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1009 {
1010
1011 kfree_skb(skb);
1012 rc = 1;
1013 goto out;
1014 } else {
1015
1016 goto out_clear_request;
1017 }
1018 }
1019
1020
1021
1022
1023 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1024 if (len == -1)
1025 goto out_sock_put;
1026
1027
1028
1029
1030
1031
1032 x25_limit_facilities(&facilities, nb);
1033
1034
1035
1036
1037 make = x25_make_new(sk);
1038 if (!make)
1039 goto out_sock_put;
1040
1041
1042
1043
1044 skb_pull(skb, len);
1045
1046 skb->sk = make;
1047 make->sk_state = TCP_ESTABLISHED;
1048
1049 makex25 = x25_sk(make);
1050 makex25->lci = lci;
1051 makex25->dest_addr = dest_addr;
1052 makex25->source_addr = source_addr;
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
1058 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1059
1060 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1061 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1062
1063
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
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);
1089out:
1090 return rc;
1091out_sock_put:
1092 sock_put(sk);
1093out_clear_request:
1094 rc = 0;
1095 x25_transmit_clear_request(nb, lci, 0x01);
1096 goto out;
1097}
1098
1099static 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
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
1147
1148
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
1159 if (len > 65535) {
1160 rc = -EMSGSIZE;
1161 goto out;
1162 }
1163
1164 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1165
1166
1167 SOCK_DEBUG(sk, "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
1185
1186 SOCK_DEBUG(sk, "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
1197
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
1209
1210 SOCK_DEBUG(sk, "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
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
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 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1245 SOCK_DEBUG(sk, "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;
1264out:
1265 release_sock(sk);
1266 return rc;
1267out_kfree_skb:
1268 kfree_skb(skb);
1269 goto out;
1270}
1271
1272
1273static 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
1295
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
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
1324 release_sock(sk);
1325 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1326 flags & MSG_DONTWAIT, &rc);
1327 lock_sock(sk);
1328 if (!skb)
1329 goto out;
1330
1331 if (!pskb_may_pull(skb, header_len))
1332 goto out_free_dgram;
1333
1334 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1335
1336 skb_pull(skb, header_len);
1337
1338 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1339 asmptr = skb_push(skb, 1);
1340 *asmptr = qbit;
1341 }
1342 }
1343
1344 skb_reset_transport_header(skb);
1345 copied = skb->len;
1346
1347 if (copied > size) {
1348 copied = size;
1349 msg->msg_flags |= MSG_TRUNC;
1350 }
1351
1352
1353 msg->msg_flags |= MSG_EOR;
1354
1355 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1356 if (rc)
1357 goto out_free_dgram;
1358
1359 if (sx25) {
1360 sx25->sx25_family = AF_X25;
1361 sx25->sx25_addr = x25->dest_addr;
1362 msg->msg_namelen = sizeof(*sx25);
1363 }
1364
1365 x25_check_rbuf(sk);
1366 rc = copied;
1367out_free_dgram:
1368 skb_free_datagram(sk, skb);
1369out:
1370 release_sock(sk);
1371 return rc;
1372}
1373
1374
1375static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1376{
1377 struct sock *sk = sock->sk;
1378 struct x25_sock *x25 = x25_sk(sk);
1379 void __user *argp = (void __user *)arg;
1380 int rc;
1381
1382 switch (cmd) {
1383 case TIOCOUTQ: {
1384 int amount;
1385
1386 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1387 if (amount < 0)
1388 amount = 0;
1389 rc = put_user(amount, (unsigned int __user *)argp);
1390 break;
1391 }
1392
1393 case TIOCINQ: {
1394 struct sk_buff *skb;
1395 int amount = 0;
1396
1397
1398
1399
1400 lock_sock(sk);
1401 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1402 amount = skb->len;
1403 release_sock(sk);
1404 rc = put_user(amount, (unsigned int __user *)argp);
1405 break;
1406 }
1407
1408 case SIOCGIFADDR:
1409 case SIOCSIFADDR:
1410 case SIOCGIFDSTADDR:
1411 case SIOCSIFDSTADDR:
1412 case SIOCGIFBRDADDR:
1413 case SIOCSIFBRDADDR:
1414 case SIOCGIFNETMASK:
1415 case SIOCSIFNETMASK:
1416 case SIOCGIFMETRIC:
1417 case SIOCSIFMETRIC:
1418 rc = -EINVAL;
1419 break;
1420 case SIOCADDRT:
1421 case SIOCDELRT:
1422 rc = -EPERM;
1423 if (!capable(CAP_NET_ADMIN))
1424 break;
1425 rc = x25_route_ioctl(cmd, argp);
1426 break;
1427 case SIOCX25GSUBSCRIP:
1428 rc = x25_subscr_ioctl(cmd, argp);
1429 break;
1430 case SIOCX25SSUBSCRIP:
1431 rc = -EPERM;
1432 if (!capable(CAP_NET_ADMIN))
1433 break;
1434 rc = x25_subscr_ioctl(cmd, argp);
1435 break;
1436 case SIOCX25GFACILITIES: {
1437 lock_sock(sk);
1438 rc = copy_to_user(argp, &x25->facilities,
1439 sizeof(x25->facilities))
1440 ? -EFAULT : 0;
1441 release_sock(sk);
1442 break;
1443 }
1444
1445 case SIOCX25SFACILITIES: {
1446 struct x25_facilities facilities;
1447 rc = -EFAULT;
1448 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1449 break;
1450 rc = -EINVAL;
1451 lock_sock(sk);
1452 if (sk->sk_state != TCP_LISTEN &&
1453 sk->sk_state != TCP_CLOSE)
1454 goto out_fac_release;
1455 if (facilities.pacsize_in < X25_PS16 ||
1456 facilities.pacsize_in > X25_PS4096)
1457 goto out_fac_release;
1458 if (facilities.pacsize_out < X25_PS16 ||
1459 facilities.pacsize_out > X25_PS4096)
1460 goto out_fac_release;
1461 if (facilities.winsize_in < 1 ||
1462 facilities.winsize_in > 127)
1463 goto out_fac_release;
1464 if (facilities.throughput) {
1465 int out = facilities.throughput & 0xf0;
1466 int in = facilities.throughput & 0x0f;
1467 if (!out)
1468 facilities.throughput |=
1469 X25_DEFAULT_THROUGHPUT << 4;
1470 else if (out < 0x30 || out > 0xD0)
1471 goto out_fac_release;
1472 if (!in)
1473 facilities.throughput |=
1474 X25_DEFAULT_THROUGHPUT;
1475 else if (in < 0x03 || in > 0x0D)
1476 goto out_fac_release;
1477 }
1478 if (facilities.reverse &&
1479 (facilities.reverse & 0x81) != 0x81)
1480 goto out_fac_release;
1481 x25->facilities = facilities;
1482 rc = 0;
1483out_fac_release:
1484 release_sock(sk);
1485 break;
1486 }
1487
1488 case SIOCX25GDTEFACILITIES: {
1489 lock_sock(sk);
1490 rc = copy_to_user(argp, &x25->dte_facilities,
1491 sizeof(x25->dte_facilities));
1492 release_sock(sk);
1493 if (rc)
1494 rc = -EFAULT;
1495 break;
1496 }
1497
1498 case SIOCX25SDTEFACILITIES: {
1499 struct x25_dte_facilities dtefacs;
1500 rc = -EFAULT;
1501 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1502 break;
1503 rc = -EINVAL;
1504 lock_sock(sk);
1505 if (sk->sk_state != TCP_LISTEN &&
1506 sk->sk_state != TCP_CLOSE)
1507 goto out_dtefac_release;
1508 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1509 goto out_dtefac_release;
1510 if (dtefacs.called_len > X25_MAX_AE_LEN)
1511 goto out_dtefac_release;
1512 x25->dte_facilities = dtefacs;
1513 rc = 0;
1514out_dtefac_release:
1515 release_sock(sk);
1516 break;
1517 }
1518
1519 case SIOCX25GCALLUSERDATA: {
1520 lock_sock(sk);
1521 rc = copy_to_user(argp, &x25->calluserdata,
1522 sizeof(x25->calluserdata))
1523 ? -EFAULT : 0;
1524 release_sock(sk);
1525 break;
1526 }
1527
1528 case SIOCX25SCALLUSERDATA: {
1529 struct x25_calluserdata calluserdata;
1530
1531 rc = -EFAULT;
1532 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1533 break;
1534 rc = -EINVAL;
1535 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1536 break;
1537 lock_sock(sk);
1538 x25->calluserdata = calluserdata;
1539 release_sock(sk);
1540 rc = 0;
1541 break;
1542 }
1543
1544 case SIOCX25GCAUSEDIAG: {
1545 lock_sock(sk);
1546 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1547 ? -EFAULT : 0;
1548 release_sock(sk);
1549 break;
1550 }
1551
1552 case SIOCX25SCAUSEDIAG: {
1553 struct x25_causediag causediag;
1554 rc = -EFAULT;
1555 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1556 break;
1557 lock_sock(sk);
1558 x25->causediag = causediag;
1559 release_sock(sk);
1560 rc = 0;
1561 break;
1562
1563 }
1564
1565 case SIOCX25SCUDMATCHLEN: {
1566 struct x25_subaddr sub_addr;
1567 rc = -EINVAL;
1568 lock_sock(sk);
1569 if(sk->sk_state != TCP_CLOSE)
1570 goto out_cud_release;
1571 rc = -EFAULT;
1572 if (copy_from_user(&sub_addr, argp,
1573 sizeof(sub_addr)))
1574 goto out_cud_release;
1575 rc = -EINVAL;
1576 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1577 goto out_cud_release;
1578 x25->cudmatchlength = sub_addr.cudmatchlength;
1579 rc = 0;
1580out_cud_release:
1581 release_sock(sk);
1582 break;
1583 }
1584
1585 case SIOCX25CALLACCPTAPPRV: {
1586 rc = -EINVAL;
1587 lock_sock(sk);
1588 if (sk->sk_state == TCP_CLOSE) {
1589 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1590 rc = 0;
1591 }
1592 release_sock(sk);
1593 break;
1594 }
1595
1596 case SIOCX25SENDCALLACCPT: {
1597 rc = -EINVAL;
1598 lock_sock(sk);
1599 if (sk->sk_state != TCP_ESTABLISHED)
1600 goto out_sendcallaccpt_release;
1601
1602 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1603 goto out_sendcallaccpt_release;
1604 x25_write_internal(sk, X25_CALL_ACCEPTED);
1605 x25->state = X25_STATE_3;
1606 rc = 0;
1607out_sendcallaccpt_release:
1608 release_sock(sk);
1609 break;
1610 }
1611
1612 default:
1613 rc = -ENOIOCTLCMD;
1614 break;
1615 }
1616
1617 return rc;
1618}
1619
1620static const struct net_proto_family x25_family_ops = {
1621 .family = AF_X25,
1622 .create = x25_create,
1623 .owner = THIS_MODULE,
1624};
1625
1626#ifdef CONFIG_COMPAT
1627static int compat_x25_subscr_ioctl(unsigned int cmd,
1628 struct compat_x25_subscrip_struct __user *x25_subscr32)
1629{
1630 struct compat_x25_subscrip_struct x25_subscr;
1631 struct x25_neigh *nb;
1632 struct net_device *dev;
1633 int rc = -EINVAL;
1634
1635 rc = -EFAULT;
1636 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1637 goto out;
1638
1639 rc = -EINVAL;
1640 dev = x25_dev_get(x25_subscr.device);
1641 if (dev == NULL)
1642 goto out;
1643
1644 nb = x25_get_neigh(dev);
1645 if (nb == NULL)
1646 goto out_dev_put;
1647
1648 dev_put(dev);
1649
1650 if (cmd == SIOCX25GSUBSCRIP) {
1651 read_lock_bh(&x25_neigh_list_lock);
1652 x25_subscr.extended = nb->extended;
1653 x25_subscr.global_facil_mask = nb->global_facil_mask;
1654 read_unlock_bh(&x25_neigh_list_lock);
1655 rc = copy_to_user(x25_subscr32, &x25_subscr,
1656 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1657 } else {
1658 rc = -EINVAL;
1659 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1660 rc = 0;
1661 write_lock_bh(&x25_neigh_list_lock);
1662 nb->extended = x25_subscr.extended;
1663 nb->global_facil_mask = x25_subscr.global_facil_mask;
1664 write_unlock_bh(&x25_neigh_list_lock);
1665 }
1666 }
1667 x25_neigh_put(nb);
1668out:
1669 return rc;
1670out_dev_put:
1671 dev_put(dev);
1672 goto out;
1673}
1674
1675static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1676 unsigned long arg)
1677{
1678 void __user *argp = compat_ptr(arg);
1679 int rc = -ENOIOCTLCMD;
1680
1681 switch(cmd) {
1682 case TIOCOUTQ:
1683 case TIOCINQ:
1684 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1685 break;
1686 case SIOCGIFADDR:
1687 case SIOCSIFADDR:
1688 case SIOCGIFDSTADDR:
1689 case SIOCSIFDSTADDR:
1690 case SIOCGIFBRDADDR:
1691 case SIOCSIFBRDADDR:
1692 case SIOCGIFNETMASK:
1693 case SIOCSIFNETMASK:
1694 case SIOCGIFMETRIC:
1695 case SIOCSIFMETRIC:
1696 rc = -EINVAL;
1697 break;
1698 case SIOCADDRT:
1699 case SIOCDELRT:
1700 rc = -EPERM;
1701 if (!capable(CAP_NET_ADMIN))
1702 break;
1703 rc = x25_route_ioctl(cmd, argp);
1704 break;
1705 case SIOCX25GSUBSCRIP:
1706 rc = compat_x25_subscr_ioctl(cmd, argp);
1707 break;
1708 case SIOCX25SSUBSCRIP:
1709 rc = -EPERM;
1710 if (!capable(CAP_NET_ADMIN))
1711 break;
1712 rc = compat_x25_subscr_ioctl(cmd, argp);
1713 break;
1714 case SIOCX25GFACILITIES:
1715 case SIOCX25SFACILITIES:
1716 case SIOCX25GDTEFACILITIES:
1717 case SIOCX25SDTEFACILITIES:
1718 case SIOCX25GCALLUSERDATA:
1719 case SIOCX25SCALLUSERDATA:
1720 case SIOCX25GCAUSEDIAG:
1721 case SIOCX25SCAUSEDIAG:
1722 case SIOCX25SCUDMATCHLEN:
1723 case SIOCX25CALLACCPTAPPRV:
1724 case SIOCX25SENDCALLACCPT:
1725 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1726 break;
1727 default:
1728 rc = -ENOIOCTLCMD;
1729 break;
1730 }
1731 return rc;
1732}
1733#endif
1734
1735static const struct proto_ops x25_proto_ops = {
1736 .family = AF_X25,
1737 .owner = THIS_MODULE,
1738 .release = x25_release,
1739 .bind = x25_bind,
1740 .connect = x25_connect,
1741 .socketpair = sock_no_socketpair,
1742 .accept = x25_accept,
1743 .getname = x25_getname,
1744 .poll = datagram_poll,
1745 .ioctl = x25_ioctl,
1746#ifdef CONFIG_COMPAT
1747 .compat_ioctl = compat_x25_ioctl,
1748#endif
1749 .gettstamp = sock_gettstamp,
1750 .listen = x25_listen,
1751 .shutdown = sock_no_shutdown,
1752 .setsockopt = x25_setsockopt,
1753 .getsockopt = x25_getsockopt,
1754 .sendmsg = x25_sendmsg,
1755 .recvmsg = x25_recvmsg,
1756 .mmap = sock_no_mmap,
1757 .sendpage = sock_no_sendpage,
1758};
1759
1760static struct packet_type x25_packet_type __read_mostly = {
1761 .type = cpu_to_be16(ETH_P_X25),
1762 .func = x25_lapb_receive_frame,
1763};
1764
1765static struct notifier_block x25_dev_notifier = {
1766 .notifier_call = x25_device_event,
1767};
1768
1769void x25_kill_by_neigh(struct x25_neigh *nb)
1770{
1771 struct sock *s;
1772
1773 write_lock_bh(&x25_list_lock);
1774
1775 sk_for_each(s, &x25_list)
1776 if (x25_sk(s)->neighbour == nb)
1777 x25_disconnect(s, ENETUNREACH, 0, 0);
1778
1779 write_unlock_bh(&x25_list_lock);
1780
1781
1782 x25_clear_forward_by_dev(nb->dev);
1783}
1784
1785static int __init x25_init(void)
1786{
1787 int rc;
1788
1789 rc = proto_register(&x25_proto, 0);
1790 if (rc)
1791 goto out;
1792
1793 rc = sock_register(&x25_family_ops);
1794 if (rc)
1795 goto out_proto;
1796
1797 dev_add_pack(&x25_packet_type);
1798
1799 rc = register_netdevice_notifier(&x25_dev_notifier);
1800 if (rc)
1801 goto out_sock;
1802
1803 rc = x25_register_sysctl();
1804 if (rc)
1805 goto out_dev;
1806
1807 rc = x25_proc_init();
1808 if (rc)
1809 goto out_sysctl;
1810
1811 pr_info("Linux Version 0.2\n");
1812
1813out:
1814 return rc;
1815out_sysctl:
1816 x25_unregister_sysctl();
1817out_dev:
1818 unregister_netdevice_notifier(&x25_dev_notifier);
1819out_sock:
1820 dev_remove_pack(&x25_packet_type);
1821 sock_unregister(AF_X25);
1822out_proto:
1823 proto_unregister(&x25_proto);
1824 goto out;
1825}
1826module_init(x25_init);
1827
1828static void __exit x25_exit(void)
1829{
1830 x25_proc_exit();
1831 x25_link_free();
1832 x25_route_free();
1833
1834 x25_unregister_sysctl();
1835
1836 unregister_netdevice_notifier(&x25_dev_notifier);
1837
1838 dev_remove_pack(&x25_packet_type);
1839
1840 sock_unregister(AF_X25);
1841 proto_unregister(&x25_proto);
1842}
1843module_exit(x25_exit);
1844
1845MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1846MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1847MODULE_LICENSE("GPL");
1848MODULE_ALIAS_NETPROTO(PF_X25);
1849
