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[X.25]: Add call forwarding
[net-next-2.6.git] / net / x25 / af_x25.c
CommitLineData
1da177e4
LT		 1/*
2 * X.25 Packet Layer release 002
3 *
4 * This is ALPHA test software. This code may break your machine,
5 * randomly fail to work with new releases, misbehave and/or generally
6 * screw up. It might even work.
7 *
8 * This code REQUIRES 2.1.15 or higher
9 *
10 * This module:
11 * This module is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 *
16 * History
17 * X.25 001 Jonathan Naylor Started coding.
18 * X.25 002 Jonathan Naylor Centralised disconnect handling.
19 * New timer architecture.
20 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant.
21 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of
22 * facilities negotiation and increased
23 * the throughput upper limit.
24 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups
25 * 2000-09-04 Henner Eisen Set sock->state in x25_accept().
26 * Fixed x25_output() related skb leakage.
27 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket.
28 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation.
29 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN
30 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
31 * x25_proc.c, using seq_file
cb65d506
SP		 32 * 2005-04-02 Shaun Pereira Selective sub address matching
33 * with call user data
ebc3f64b
SP		 34 * 2005-04-15 Shaun Pereira Fast select with no restriction on
35 * response
1da177e4
LT		 36 */
37
1da177e4 38#include <linux/module.h>
4fc268d2 39#include <linux/capability.h>
1da177e4
LT		 40#include <linux/errno.h>
41#include <linux/kernel.h>
42#include <linux/sched.h>
43#include <linux/timer.h>
44#include <linux/string.h>
45#include <linux/net.h>
46#include <linux/netdevice.h>
47#include <linux/if_arp.h>
48#include <linux/skbuff.h>
49#include <net/sock.h>
c752f073 50#include <net/tcp_states.h>
1da177e4
LT		 51#include <asm/uaccess.h>
52#include <linux/fcntl.h>
53#include <linux/termios.h> /* For TIOCINQ/OUTQ */
54#include <linux/notifier.h>
55#include <linux/init.h>
1b06e6ba
SP		 56#include <linux/compat.h>
57
1da177e4 58#include <net/x25.h>
1b06e6ba 59#include <net/compat.h>
1da177e4
LT		 60
61int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
62int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
63int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
64int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
65int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
66
67HLIST_HEAD(x25_list);
68DEFINE_RWLOCK(x25_list_lock);
69
90ddc4f0 70static const struct proto_ops x25_proto_ops;
1da177e4
LT		 71
72static struct x25_address null_x25_address = {" "};
73
1b06e6ba
SP		 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
1da177e4
LT		 82int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
83 struct x25_address *calling_addr)
84{
85 int called_len, calling_len;
86 char *called, *calling;
87 int i;
88
89 called_len = (*p >> 0) & 0x0F;
90 calling_len = (*p >> 4) & 0x0F;
91
92 called = called_addr->x25_addr;
93 calling = calling_addr->x25_addr;
94 p++;
95
96 for (i = 0; i < (called_len + calling_len); i++) {
97 if (i < called_len) {
98 if (i % 2 != 0) {
99 *called++ = ((*p >> 0) & 0x0F) + '0';
100 p++;
101 } else {
102 *called++ = ((*p >> 4) & 0x0F) + '0';
103 }
104 } else {
105 if (i % 2 != 0) {
106 *calling++ = ((*p >> 0) & 0x0F) + '0';
107 p++;
108 } else {
109 *calling++ = ((*p >> 4) & 0x0F) + '0';
110 }
111 }
112 }
113
114 *called = *calling = '\0';
115
116 return 1 + (called_len + calling_len + 1) / 2;
117}
118
119int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
120 struct x25_address *calling_addr)
121{
122 unsigned int called_len, calling_len;
123 char *called, *calling;
124 int i;
125
126 called = called_addr->x25_addr;
127 calling = calling_addr->x25_addr;
128
129 called_len = strlen(called);
130 calling_len = strlen(calling);
131
132 *p++ = (calling_len << 4) | (called_len << 0);
133
134 for (i = 0; i < (called_len + calling_len); i++) {
135 if (i < called_len) {
136 if (i % 2 != 0) {
137 *p |= (*called++ - '0') << 0;
138 p++;
139 } else {
140 *p = 0x00;
141 *p |= (*called++ - '0') << 4;
142 }
143 } else {
144 if (i % 2 != 0) {
145 *p |= (*calling++ - '0') << 0;
146 p++;
147 } else {
148 *p = 0x00;
149 *p |= (*calling++ - '0') << 4;
150 }
151 }
152 }
153
154 return 1 + (called_len + calling_len + 1) / 2;
155}
156
157/*
158 * Socket removal during an interrupt is now safe.
159 */
160static void x25_remove_socket(struct sock *sk)
161{
162 write_lock_bh(&x25_list_lock);
163 sk_del_node_init(sk);
164 write_unlock_bh(&x25_list_lock);
165}
166
167/*
168 * Kill all bound sockets on a dropped device.
169 */
170static void x25_kill_by_device(struct net_device *dev)
171{
172 struct sock *s;
173 struct hlist_node *node;
174
175 write_lock_bh(&x25_list_lock);
176
177 sk_for_each(s, node, &x25_list)
178 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
179 x25_disconnect(s, ENETUNREACH, 0, 0);
180
181 write_unlock_bh(&x25_list_lock);
182}
183
184/*
185 * Handle device status changes.
186 */
187static int x25_device_event(struct notifier_block *this, unsigned long event,
188 void *ptr)
189{
190 struct net_device *dev = ptr;
191 struct x25_neigh *nb;
192
193 if (dev->type == ARPHRD_X25
194#if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
195 || dev->type == ARPHRD_ETHER
196#endif
197 ) {
198 switch (event) {
199 case NETDEV_UP:
200 x25_link_device_up(dev);
201 break;
202 case NETDEV_GOING_DOWN:
203 nb = x25_get_neigh(dev);
204 if (nb) {
205 x25_terminate_link(nb);
206 x25_neigh_put(nb);
207 }
208 break;
209 case NETDEV_DOWN:
210 x25_kill_by_device(dev);
211 x25_route_device_down(dev);
212 x25_link_device_down(dev);
213 break;
214 }
215 }
216
217 return NOTIFY_DONE;
218}
219
220/*
221 * Add a socket to the bound sockets list.
222 */
223static void x25_insert_socket(struct sock *sk)
224{
225 write_lock_bh(&x25_list_lock);
226 sk_add_node(sk, &x25_list);
227 write_unlock_bh(&x25_list_lock);
228}
229
230/*
231 * Find a socket that wants to accept the Call Request we just
232 * received. Check the full list for an address/cud match.
233 * If no cuds match return the next_best thing, an address match.
234 * Note: if a listening socket has cud set it must only get calls
235 * with matching cud.
236 */
cb65d506
SP		 237static struct sock *x25_find_listener(struct x25_address *addr,
238 struct sk_buff *skb)
1da177e4
LT		 239{
240 struct sock *s;
241 struct sock *next_best;
242 struct hlist_node *node;
243
244 read_lock_bh(&x25_list_lock);
245 next_best = NULL;
246
247 sk_for_each(s, node, &x25_list)
248 if ((!strcmp(addr->x25_addr,
cb65d506
SP		 249 x25_sk(s)->source_addr.x25_addr) ||
250 !strcmp(addr->x25_addr,
251 null_x25_address.x25_addr)) &&
252 s->sk_state == TCP_LISTEN) {
1da177e4
LT		 253 /*
254 * Found a listening socket, now check the incoming
255 * call user data vs this sockets call user data
256 */
cb65d506
SP		 257 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
258 if((memcmp(x25_sk(s)->calluserdata.cuddata,
259 skb->data,
260 x25_sk(s)->cudmatchlength)) == 0) {
261 sock_hold(s);
262 goto found;
263 }
264 } else
1da177e4 265 next_best = s;
1da177e4
LT		 266 }
267 if (next_best) {
268 s = next_best;
269 sock_hold(s);
270 goto found;
271 }
272 s = NULL;
273found:
274 read_unlock_bh(&x25_list_lock);
275 return s;
276}
277
278/*
279 * Find a connected X.25 socket given my LCI and neighbour.
280 */
281static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
282{
283 struct sock *s;
284 struct hlist_node *node;
285
286 sk_for_each(s, node, &x25_list)
287 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
288 sock_hold(s);
289 goto found;
290 }
291 s = NULL;
292found:
293 return s;
294}
295
296struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
297{
298 struct sock *s;
299
300 read_lock_bh(&x25_list_lock);
301 s = __x25_find_socket(lci, nb);
302 read_unlock_bh(&x25_list_lock);
303 return s;
304}
305
306/*
307 * Find a unique LCI for a given device.
308 */
309static unsigned int x25_new_lci(struct x25_neigh *nb)
310{
311 unsigned int lci = 1;
312 struct sock *sk;
313
314 read_lock_bh(&x25_list_lock);
315
316 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
317 sock_put(sk);
318 if (++lci == 4096) {
319 lci = 0;
320 break;
321 }
322 }
323
324 read_unlock_bh(&x25_list_lock);
325 return lci;
326}
327
328/*
329 * Deferred destroy.
330 */
331void x25_destroy_socket(struct sock *);
332
333/*
334 * handler for deferred kills.
335 */
336static void x25_destroy_timer(unsigned long data)
337{
338 x25_destroy_socket((struct sock *)data);
339}
340
341/*
342 * This is called from user mode and the timers. Thus it protects itself
343 * against interrupt users but doesn't worry about being called during
344 * work. Once it is removed from the queue no interrupt or bottom half
345 * will touch it and we are (fairly 8-) ) safe.
346 * Not static as it's used by the timer
347 */
348void x25_destroy_socket(struct sock *sk)
349{
350 struct sk_buff *skb;
351
352 sock_hold(sk);
353 lock_sock(sk);
354 x25_stop_heartbeat(sk);
355 x25_stop_timer(sk);
356
357 x25_remove_socket(sk);
358 x25_clear_queues(sk); /* Flush the queues */
359
360 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
361 if (skb->sk != sk) { /* A pending connection */
362 /*
363 * Queue the unaccepted socket for death
364 */
365 sock_set_flag(skb->sk, SOCK_DEAD);
366 x25_start_heartbeat(skb->sk);
367 x25_sk(skb->sk)->state = X25_STATE_0;
368 }
369
370 kfree_skb(skb);
371 }
372
373 if (atomic_read(&sk->sk_wmem_alloc) ||
374 atomic_read(&sk->sk_rmem_alloc)) {
375 /* Defer: outstanding buffers */
376 sk->sk_timer.expires = jiffies + 10 * HZ;
377 sk->sk_timer.function = x25_destroy_timer;
378 sk->sk_timer.data = (unsigned long)sk;
379 add_timer(&sk->sk_timer);
380 } else {
381 /* drop last reference so sock_put will free */
382 __sock_put(sk);
383 }
384
385 release_sock(sk);
386 sock_put(sk);
387}
388
389/*
390 * Handling for system calls applied via the various interfaces to a
391 * X.25 socket object.
392 */
393
394static int x25_setsockopt(struct socket *sock, int level, int optname,
395 char __user *optval, int optlen)
396{
397 int opt;
398 struct sock *sk = sock->sk;
399 int rc = -ENOPROTOOPT;
400
401 if (level != SOL_X25 || optname != X25_QBITINCL)
402 goto out;
403
404 rc = -EINVAL;
405 if (optlen < sizeof(int))
406 goto out;
407
408 rc = -EFAULT;
409 if (get_user(opt, (int __user *)optval))
410 goto out;
411
412 x25_sk(sk)->qbitincl = !!opt;
413 rc = 0;
414out:
415 return rc;
416}
417
418static int x25_getsockopt(struct socket *sock, int level, int optname,
419 char __user *optval, int __user *optlen)
420{
421 struct sock *sk = sock->sk;
422 int val, len, rc = -ENOPROTOOPT;
423
424 if (level != SOL_X25 || optname != X25_QBITINCL)
425 goto out;
426
427 rc = -EFAULT;
428 if (get_user(len, optlen))
429 goto out;
430
431 len = min_t(unsigned int, len, sizeof(int));
432
433 rc = -EINVAL;
434 if (len < 0)
435 goto out;
436
437 rc = -EFAULT;
438 if (put_user(len, optlen))
439 goto out;
440
441 val = x25_sk(sk)->qbitincl;
442 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
443out:
444 return rc;
445}
446
447static int x25_listen(struct socket *sock, int backlog)
448{
449 struct sock *sk = sock->sk;
450 int rc = -EOPNOTSUPP;
451
452 if (sk->sk_state != TCP_LISTEN) {
453 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
454 sk->sk_max_ack_backlog = backlog;
455 sk->sk_state = TCP_LISTEN;
456 rc = 0;
457 }
458
459 return rc;
460}
461
462static struct proto x25_proto = {
463 .name = "X25",
464 .owner = THIS_MODULE,
465 .obj_size = sizeof(struct x25_sock),
466};
467
468static struct sock *x25_alloc_socket(void)
469{
470 struct x25_sock *x25;
471 struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, &x25_proto, 1);
472
473 if (!sk)
474 goto out;
475
476 sock_init_data(NULL, sk);
477
478 x25 = x25_sk(sk);
479 skb_queue_head_init(&x25->ack_queue);
480 skb_queue_head_init(&x25->fragment_queue);
481 skb_queue_head_init(&x25->interrupt_in_queue);
482 skb_queue_head_init(&x25->interrupt_out_queue);
483out:
484 return sk;
485}
486
1da177e4
LT		 487static int x25_create(struct socket *sock, int protocol)
488{
489 struct sock *sk;
490 struct x25_sock *x25;
491 int rc = -ESOCKTNOSUPPORT;
492
493 if (sock->type != SOCK_SEQPACKET || protocol)
494 goto out;
495
496 rc = -ENOMEM;
497 if ((sk = x25_alloc_socket()) == NULL)
498 goto out;
499
500 x25 = x25_sk(sk);
501
502 sock_init_data(sock, sk);
503
504 x25_init_timers(sk);
505
506 sock->ops = &x25_proto_ops;
507 sk->sk_protocol = protocol;
508 sk->sk_backlog_rcv = x25_backlog_rcv;
509
510 x25->t21 = sysctl_x25_call_request_timeout;
511 x25->t22 = sysctl_x25_reset_request_timeout;
512 x25->t23 = sysctl_x25_clear_request_timeout;
513 x25->t2 = sysctl_x25_ack_holdback_timeout;
514 x25->state = X25_STATE_0;
cb65d506 515 x25->cudmatchlength = 0;
ebc3f64b
SP		 516 x25->accptapprv = X25_DENY_ACCPT_APPRV; /* normally no cud */
517 /* on call accept */
1da177e4
LT		 518
519 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
520 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
521 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
522 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
523 x25->facilities.throughput = X25_DEFAULT_THROUGHPUT;
524 x25->facilities.reverse = X25_DEFAULT_REVERSE;
a64b7b93
SP		 525 x25->dte_facilities.calling_len = 0;
526 x25->dte_facilities.called_len = 0;
527 memset(x25->dte_facilities.called_ae, '\0',
528 sizeof(x25->dte_facilities.called_ae));
529 memset(x25->dte_facilities.calling_ae, '\0',
530 sizeof(x25->dte_facilities.calling_ae));
531
1da177e4
LT		 532 rc = 0;
533out:
534 return rc;
535}
536
537static struct sock *x25_make_new(struct sock *osk)
538{
539 struct sock *sk = NULL;
540 struct x25_sock *x25, *ox25;
541
542 if (osk->sk_type != SOCK_SEQPACKET)
543 goto out;
544
545 if ((sk = x25_alloc_socket()) == NULL)
546 goto out;
547
548 x25 = x25_sk(sk);
549
550 sk->sk_type = osk->sk_type;
551 sk->sk_socket = osk->sk_socket;
552 sk->sk_priority = osk->sk_priority;
553 sk->sk_protocol = osk->sk_protocol;
554 sk->sk_rcvbuf = osk->sk_rcvbuf;
555 sk->sk_sndbuf = osk->sk_sndbuf;
556 sk->sk_state = TCP_ESTABLISHED;
557 sk->sk_sleep = osk->sk_sleep;
558 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
a20a8554 559 sock_copy_flags(sk, osk);
1da177e4
LT		 560
561 ox25 = x25_sk(osk);
562 x25->t21 = ox25->t21;
563 x25->t22 = ox25->t22;
564 x25->t23 = ox25->t23;
565 x25->t2 = ox25->t2;
566 x25->facilities = ox25->facilities;
567 x25->qbitincl = ox25->qbitincl;
a64b7b93 568 x25->dte_facilities = ox25->dte_facilities;
cb65d506 569 x25->cudmatchlength = ox25->cudmatchlength;
ebc3f64b 570 x25->accptapprv = ox25->accptapprv;
1da177e4
LT		 571
572 x25_init_timers(sk);
573out:
574 return sk;
575}
576
577static int x25_release(struct socket *sock)
578{
579 struct sock *sk = sock->sk;
580 struct x25_sock *x25;
581
582 if (!sk)
583 goto out;
584
585 x25 = x25_sk(sk);
586
587 switch (x25->state) {
588
589 case X25_STATE_0:
590 case X25_STATE_2:
591 x25_disconnect(sk, 0, 0, 0);
592 x25_destroy_socket(sk);
593 goto out;
594
595 case X25_STATE_1:
596 case X25_STATE_3:
597 case X25_STATE_4:
598 x25_clear_queues(sk);
599 x25_write_internal(sk, X25_CLEAR_REQUEST);
600 x25_start_t23timer(sk);
601 x25->state = X25_STATE_2;
602 sk->sk_state = TCP_CLOSE;
603 sk->sk_shutdown |= SEND_SHUTDOWN;
604 sk->sk_state_change(sk);
605 sock_set_flag(sk, SOCK_DEAD);
606 sock_set_flag(sk, SOCK_DESTROY);
607 break;
608 }
609
610 sock->sk = NULL;
611 sk->sk_socket = NULL; /* Not used, but we should do this */
612out:
613 return 0;
614}
615
616static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
617{
618 struct sock *sk = sock->sk;
619 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
620
621 if (!sock_flag(sk, SOCK_ZAPPED) ||
622 addr_len != sizeof(struct sockaddr_x25) ||
623 addr->sx25_family != AF_X25)
624 return -EINVAL;
625
626 x25_sk(sk)->source_addr = addr->sx25_addr;
627 x25_insert_socket(sk);
628 sock_reset_flag(sk, SOCK_ZAPPED);
629 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
630
631 return 0;
632}
633
634static int x25_wait_for_connection_establishment(struct sock *sk)
635{
636 DECLARE_WAITQUEUE(wait, current);
637 int rc;
638
639 add_wait_queue_exclusive(sk->sk_sleep, &wait);
640 for (;;) {
641 __set_current_state(TASK_INTERRUPTIBLE);
642 rc = -ERESTARTSYS;
643 if (signal_pending(current))
644 break;
645 rc = sock_error(sk);
646 if (rc) {
647 sk->sk_socket->state = SS_UNCONNECTED;
648 break;
649 }
650 rc = 0;
651 if (sk->sk_state != TCP_ESTABLISHED) {
652 release_sock(sk);
653 schedule();
654 lock_sock(sk);
655 } else
656 break;
657 }
658 __set_current_state(TASK_RUNNING);
659 remove_wait_queue(sk->sk_sleep, &wait);
660 return rc;
661}
662
663static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
664 int addr_len, int flags)
665{
666 struct sock *sk = sock->sk;
667 struct x25_sock *x25 = x25_sk(sk);
668 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
669 struct x25_route *rt;
670 int rc = 0;
671
672 lock_sock(sk);
673 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
674 sock->state = SS_CONNECTED;
675 goto out; /* Connect completed during a ERESTARTSYS event */
676 }
677
678 rc = -ECONNREFUSED;
679 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
680 sock->state = SS_UNCONNECTED;
681 goto out;
682 }
683
684 rc = -EISCONN; /* No reconnect on a seqpacket socket */
685 if (sk->sk_state == TCP_ESTABLISHED)
686 goto out;
687
688 sk->sk_state = TCP_CLOSE;
689 sock->state = SS_UNCONNECTED;
690
691 rc = -EINVAL;
692 if (addr_len != sizeof(struct sockaddr_x25) ||
693 addr->sx25_family != AF_X25)
694 goto out;
695
696 rc = -ENETUNREACH;
697 rt = x25_get_route(&addr->sx25_addr);
698 if (!rt)
699 goto out;
700
701 x25->neighbour = x25_get_neigh(rt->dev);
702 if (!x25->neighbour)
703 goto out_put_route;
704
705 x25_limit_facilities(&x25->facilities, x25->neighbour);
706
707 x25->lci = x25_new_lci(x25->neighbour);
708 if (!x25->lci)
709 goto out_put_neigh;
710
711 rc = -EINVAL;
712 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
713 goto out_put_neigh;
714
715 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
716 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
717
718 x25->dest_addr = addr->sx25_addr;
719
720 /* Move to connecting socket, start sending Connect Requests */
721 sock->state = SS_CONNECTING;
722 sk->sk_state = TCP_SYN_SENT;
723
724 x25->state = X25_STATE_1;
725
726 x25_write_internal(sk, X25_CALL_REQUEST);
727
728 x25_start_heartbeat(sk);
729 x25_start_t21timer(sk);
730
731 /* Now the loop */
732 rc = -EINPROGRESS;
733 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
734 goto out_put_neigh;
735
736 rc = x25_wait_for_connection_establishment(sk);
737 if (rc)
738 goto out_put_neigh;
739
740 sock->state = SS_CONNECTED;
741 rc = 0;
742out_put_neigh:
743 if (rc)
744 x25_neigh_put(x25->neighbour);
745out_put_route:
746 x25_route_put(rt);
747out:
748 release_sock(sk);
749 return rc;
750}
751
bac37ec8 752static int x25_wait_for_data(struct sock *sk, long timeout)
1da177e4
LT		 753{
754 DECLARE_WAITQUEUE(wait, current);
755 int rc = 0;
756
757 add_wait_queue_exclusive(sk->sk_sleep, &wait);
758 for (;;) {
759 __set_current_state(TASK_INTERRUPTIBLE);
760 if (sk->sk_shutdown & RCV_SHUTDOWN)
761 break;
762 rc = -ERESTARTSYS;
763 if (signal_pending(current))
764 break;
765 rc = -EAGAIN;
766 if (!timeout)
767 break;
768 rc = 0;
769 if (skb_queue_empty(&sk->sk_receive_queue)) {
770 release_sock(sk);
771 timeout = schedule_timeout(timeout);
772 lock_sock(sk);
773 } else
774 break;
775 }
776 __set_current_state(TASK_RUNNING);
777 remove_wait_queue(sk->sk_sleep, &wait);
778 return rc;
779}
780
781static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
782{
783 struct sock *sk = sock->sk;
784 struct sock *newsk;
785 struct sk_buff *skb;
786 int rc = -EINVAL;
787
788 if (!sk || sk->sk_state != TCP_LISTEN)
789 goto out;
790
791 rc = -EOPNOTSUPP;
792 if (sk->sk_type != SOCK_SEQPACKET)
793 goto out;
794
795 lock_sock(sk);
796 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
797 if (rc)
798 goto out2;
799 skb = skb_dequeue(&sk->sk_receive_queue);
800 rc = -EINVAL;
801 if (!skb->sk)
802 goto out2;
803 newsk = skb->sk;
804 newsk->sk_socket = newsock;
805 newsk->sk_sleep = &newsock->wait;
806
807 /* Now attach up the new socket */
808 skb->sk = NULL;
809 kfree_skb(skb);
810 sk->sk_ack_backlog--;
811 newsock->sk = newsk;
812 newsock->state = SS_CONNECTED;
813 rc = 0;
814out2:
815 release_sock(sk);
816out:
817 return rc;
818}
819
820static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
821 int *uaddr_len, int peer)
822{
823 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
824 struct sock *sk = sock->sk;
825 struct x25_sock *x25 = x25_sk(sk);
826
827 if (peer) {
828 if (sk->sk_state != TCP_ESTABLISHED)
829 return -ENOTCONN;
830 sx25->sx25_addr = x25->dest_addr;
831 } else
832 sx25->sx25_addr = x25->source_addr;
833
834 sx25->sx25_family = AF_X25;
835 *uaddr_len = sizeof(*sx25);
836
837 return 0;
838}
839
840int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
841 unsigned int lci)
842{
843 struct sock *sk;
844 struct sock *make;
845 struct x25_sock *makex25;
846 struct x25_address source_addr, dest_addr;
847 struct x25_facilities facilities;
a64b7b93 848 struct x25_dte_facilities dte_facilities;
95a9dc43 849 int len, addr_len, rc;
1da177e4
LT		 850
851 /*
852 * Remove the LCI and frame type.
853 */
854 skb_pull(skb, X25_STD_MIN_LEN);
855
856 /*
857 * Extract the X.25 addresses and convert them to ASCII strings,
858 * and remove them.
859 */
95a9dc43
AH		 860 addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
861 skb_pull(skb, addr_len);
1da177e4
LT		 862
863 /*
864 * Get the length of the facilities, skip past them for the moment
865 * get the call user data because this is needed to determine
866 * the correct listener
867 */
868 len = skb->data[0] + 1;
869 skb_pull(skb,len);
870
1da177e4
LT		 871 /*
872 * Find a listener for the particular address/cud pair.
873 */
cb65d506
SP		 874 sk = x25_find_listener(&source_addr,skb);
875 skb_push(skb,len);
1da177e4 876
95a9dc43
AH		 877 if (sk != NULL && sk_acceptq_is_full(sk)) {
878 goto out_sock_put;
879 }
880
1da177e4 881 /*
95a9dc43
AH		 882 * We dont have any listeners for this incoming call.
883 * Try forwarding it.
1da177e4 884 */
95a9dc43
AH		 885 if (sk == NULL) {
886 skb_push(skb, addr_len + X25_STD_MIN_LEN);
887 if (x25_forward_call(&dest_addr, nb, skb, lci) > 0)
888 {
889 /* Call was forwarded, dont process it any more */
890 kfree_skb(skb);
891 rc = 1;
892 goto out;
893 } else {
894 /* No listeners, can't forward, clear the call */
895 goto out_clear_request;
896 }
897 }
1da177e4
LT		 898
899 /*
900 * Try to reach a compromise on the requested facilities.
901 */
a64b7b93
SP		 902 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
903 if (len == -1)
1da177e4
LT		 904 goto out_sock_put;
905
906 /*
907 * current neighbour/link might impose additional limits
908 * on certain facilties
909 */
910
911 x25_limit_facilities(&facilities, nb);
912
913 /*
914 * Try to create a new socket.
915 */
916 make = x25_make_new(sk);
917 if (!make)
918 goto out_sock_put;
919
920 /*
921 * Remove the facilities
922 */
923 skb_pull(skb, len);
924
925 skb->sk = make;
926 make->sk_state = TCP_ESTABLISHED;
927
928 makex25 = x25_sk(make);
929 makex25->lci = lci;
930 makex25->dest_addr = dest_addr;
931 makex25->source_addr = source_addr;
932 makex25->neighbour = nb;
933 makex25->facilities = facilities;
a64b7b93 934 makex25->dte_facilities= dte_facilities;
1da177e4 935 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
cb65d506
SP		 936 /* ensure no reverse facil on accept */
937 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
a64b7b93
SP		 938 /* ensure no calling address extension on accept */
939 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
cb65d506 940 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1da177e4 941
ebc3f64b
SP		 942 /* Normally all calls are accepted immediatly */
943 if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
944 x25_write_internal(make, X25_CALL_ACCEPTED);
945 makex25->state = X25_STATE_3;
946 }
1da177e4 947
cb65d506
SP		 948 /*
949 * Incoming Call User Data.
950 */
951 if (skb->len >= 0) {
952 memcpy(makex25->calluserdata.cuddata, skb->data, skb->len);
953 makex25->calluserdata.cudlength = skb->len;
954 }
955
1da177e4
LT		 956 sk->sk_ack_backlog++;
957
958 x25_insert_socket(make);
959
960 skb_queue_head(&sk->sk_receive_queue, skb);
961
962 x25_start_heartbeat(make);
963
964 if (!sock_flag(sk, SOCK_DEAD))
965 sk->sk_data_ready(sk, skb->len);
966 rc = 1;
967 sock_put(sk);
968out:
969 return rc;
970out_sock_put:
971 sock_put(sk);
972out_clear_request:
973 rc = 0;
974 x25_transmit_clear_request(nb, lci, 0x01);
975 goto out;
976}
977
978static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
979 struct msghdr *msg, size_t len)
980{
981 struct sock *sk = sock->sk;
982 struct x25_sock *x25 = x25_sk(sk);
983 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
984 struct sockaddr_x25 sx25;
985 struct sk_buff *skb;
986 unsigned char *asmptr;
987 int noblock = msg->msg_flags & MSG_DONTWAIT;
988 size_t size;
989 int qbit = 0, rc = -EINVAL;
990
991 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
992 goto out;
993
994 /* we currently don't support segmented records at the user interface */
995 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
996 goto out;
997
998 rc = -EADDRNOTAVAIL;
999 if (sock_flag(sk, SOCK_ZAPPED))
1000 goto out;
1001
1002 rc = -EPIPE;
1003 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1004 send_sig(SIGPIPE, current, 0);
1005 goto out;
1006 }
1007
1008 rc = -ENETUNREACH;
1009 if (!x25->neighbour)
1010 goto out;
1011
1012 if (usx25) {
1013 rc = -EINVAL;
1014 if (msg->msg_namelen < sizeof(sx25))
1015 goto out;
1016 memcpy(&sx25, usx25, sizeof(sx25));
1017 rc = -EISCONN;
1018 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1019 goto out;
1020 rc = -EINVAL;
1021 if (sx25.sx25_family != AF_X25)
1022 goto out;
1023 } else {
1024 /*
1025 * FIXME 1003.1g - if the socket is like this because
1026 * it has become closed (not started closed) we ought
1027 * to SIGPIPE, EPIPE;
1028 */
1029 rc = -ENOTCONN;
1030 if (sk->sk_state != TCP_ESTABLISHED)
1031 goto out;
1032
1033 sx25.sx25_family = AF_X25;
1034 sx25.sx25_addr = x25->dest_addr;
1035 }
1036
1037 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1038
1039 /* Build a packet */
1040 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1041
1042 if ((msg->msg_flags & MSG_OOB) && len > 32)
1043 len = 32;
1044
1045 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1046
1047 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1048 if (!skb)
1049 goto out;
1050 X25_SKB_CB(skb)->flags = msg->msg_flags;
1051
1052 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1053
1054 /*
1055 * Put the data on the end
1056 */
1057 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1058
1059 asmptr = skb->h.raw = skb_put(skb, len);
1060
1061 rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
1062 if (rc)
1063 goto out_kfree_skb;
1064
1065 /*
1066 * If the Q BIT Include socket option is in force, the first
1067 * byte of the user data is the logical value of the Q Bit.
1068 */
1069 if (x25->qbitincl) {
1070 qbit = skb->data[0];
1071 skb_pull(skb, 1);
1072 }
1073
1074 /*
1075 * Push down the X.25 header
1076 */
1077 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1078
1079 if (msg->msg_flags & MSG_OOB) {
1080 if (x25->neighbour->extended) {
1081 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1082 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1083 *asmptr++ = (x25->lci >> 0) & 0xFF;
1084 *asmptr++ = X25_INTERRUPT;
1085 } else {
1086 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1087 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1088 *asmptr++ = (x25->lci >> 0) & 0xFF;
1089 *asmptr++ = X25_INTERRUPT;
1090 }
1091 } else {
1092 if (x25->neighbour->extended) {
1093 /* Build an Extended X.25 header */
1094 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1095 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1096 *asmptr++ = (x25->lci >> 0) & 0xFF;
1097 *asmptr++ = X25_DATA;
1098 *asmptr++ = X25_DATA;
1099 } else {
1100 /* Build an Standard X.25 header */
1101 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1102 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1103 *asmptr++ = (x25->lci >> 0) & 0xFF;
1104 *asmptr++ = X25_DATA;
1105 }
1106
1107 if (qbit)
1108 skb->data[0] |= X25_Q_BIT;
1109 }
1110
1111 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1112 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1113
1114 rc = -ENOTCONN;
1115 if (sk->sk_state != TCP_ESTABLISHED)
1116 goto out_kfree_skb;
1117
1118 if (msg->msg_flags & MSG_OOB)
1119 skb_queue_tail(&x25->interrupt_out_queue, skb);
1120 else {
1121 len = x25_output(sk, skb);
1122 if (len < 0)
1123 kfree_skb(skb);
1124 else if (x25->qbitincl)
1125 len++;
1126 }
1127
1128 /*
1129 * lock_sock() is currently only used to serialize this x25_kick()
1130 * against input-driven x25_kick() calls. It currently only blocks
1131 * incoming packets for this socket and does not protect against
1132 * any other socket state changes and is not called from anywhere
1133 * else. As x25_kick() cannot block and as long as all socket
1134 * operations are BKL-wrapped, we don't need take to care about
1135 * purging the backlog queue in x25_release().
1136 *
1137 * Using lock_sock() to protect all socket operations entirely
1138 * (and making the whole x25 stack SMP aware) unfortunately would
1139 * require major changes to {send,recv}msg and skb allocation methods.
1140 * -> 2.5 ;)
1141 */
1142 lock_sock(sk);
1143 x25_kick(sk);
1144 release_sock(sk);
1145 rc = len;
1146out:
1147 return rc;
1148out_kfree_skb:
1149 kfree_skb(skb);
1150 goto out;
1151}
1152
1153
1154static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1155 struct msghdr *msg, size_t size,
1156 int flags)
1157{
1158 struct sock *sk = sock->sk;
1159 struct x25_sock *x25 = x25_sk(sk);
1160 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1161 size_t copied;
1162 int qbit;
1163 struct sk_buff *skb;
1164 unsigned char *asmptr;
1165 int rc = -ENOTCONN;
1166
1167 /*
1168 * This works for seqpacket too. The receiver has ordered the queue for
1169 * us! We do one quick check first though
1170 */
1171 if (sk->sk_state != TCP_ESTABLISHED)
1172 goto out;
1173
1174 if (flags & MSG_OOB) {
1175 rc = -EINVAL;
1176 if (sock_flag(sk, SOCK_URGINLINE) ||
1177 !skb_peek(&x25->interrupt_in_queue))
1178 goto out;
1179
1180 skb = skb_dequeue(&x25->interrupt_in_queue);
1181
1182 skb_pull(skb, X25_STD_MIN_LEN);
1183
1184 /*
1185 * No Q bit information on Interrupt data.
1186 */
1187 if (x25->qbitincl) {
1188 asmptr = skb_push(skb, 1);
1189 *asmptr = 0x00;
1190 }
1191
1192 msg->msg_flags |= MSG_OOB;
1193 } else {
1194 /* Now we can treat all alike */
1195 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1196 flags & MSG_DONTWAIT, &rc);
1197 if (!skb)
1198 goto out;
1199
1200 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1201
1202 skb_pull(skb, x25->neighbour->extended ?
1203 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1204
1205 if (x25->qbitincl) {
1206 asmptr = skb_push(skb, 1);
1207 *asmptr = qbit;
1208 }
1209 }
1210
1211 skb->h.raw = skb->data;
1212
1213 copied = skb->len;
1214
1215 if (copied > size) {
1216 copied = size;
1217 msg->msg_flags |= MSG_TRUNC;
1218 }
1219
1220 /* Currently, each datagram always contains a complete record */
1221 msg->msg_flags |= MSG_EOR;
1222
1223 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1224 if (rc)
1225 goto out_free_dgram;
1226
1227 if (sx25) {
1228 sx25->sx25_family = AF_X25;
1229 sx25->sx25_addr = x25->dest_addr;
1230 }
1231
1232 msg->msg_namelen = sizeof(struct sockaddr_x25);
1233
1234 lock_sock(sk);
1235 x25_check_rbuf(sk);
1236 release_sock(sk);
1237 rc = copied;
1238out_free_dgram:
1239 skb_free_datagram(sk, skb);
1240out:
1241 return rc;
1242}
1243
1244
1245static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1246{
1247 struct sock *sk = sock->sk;
1248 struct x25_sock *x25 = x25_sk(sk);
1249 void __user *argp = (void __user *)arg;
1250 int rc;
1251
1252 switch (cmd) {
1253 case TIOCOUTQ: {
1254 int amount = sk->sk_sndbuf -
1255 atomic_read(&sk->sk_wmem_alloc);
1256 if (amount < 0)
1257 amount = 0;
1258 rc = put_user(amount, (unsigned int __user *)argp);
1259 break;
1260 }
1261
1262 case TIOCINQ: {
1263 struct sk_buff *skb;
1264 int amount = 0;
1265 /*
1266 * These two are safe on a single CPU system as
1267 * only user tasks fiddle here
1268 */
1269 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1270 amount = skb->len;
1271 rc = put_user(amount, (unsigned int __user *)argp);
1272 break;
1273 }
1274
1275 case SIOCGSTAMP:
1276 rc = -EINVAL;
1277 if (sk)
1278 rc = sock_get_timestamp(sk,
1279 (struct timeval __user *)argp);
1280 break;
1281 case SIOCGIFADDR:
1282 case SIOCSIFADDR:
1283 case SIOCGIFDSTADDR:
1284 case SIOCSIFDSTADDR:
1285 case SIOCGIFBRDADDR:
1286 case SIOCSIFBRDADDR:
1287 case SIOCGIFNETMASK:
1288 case SIOCSIFNETMASK:
1289 case SIOCGIFMETRIC:
1290 case SIOCSIFMETRIC:
1291 rc = -EINVAL;
1292 break;
1293 case SIOCADDRT:
1294 case SIOCDELRT:
1295 rc = -EPERM;
1296 if (!capable(CAP_NET_ADMIN))
1297 break;
1298 rc = x25_route_ioctl(cmd, argp);
1299 break;
1300 case SIOCX25GSUBSCRIP:
1301 rc = x25_subscr_ioctl(cmd, argp);
1302 break;
1303 case SIOCX25SSUBSCRIP:
1304 rc = -EPERM;
1305 if (!capable(CAP_NET_ADMIN))
1306 break;
1307 rc = x25_subscr_ioctl(cmd, argp);
1308 break;
1309 case SIOCX25GFACILITIES: {
1310 struct x25_facilities fac = x25->facilities;
1311 rc = copy_to_user(argp, &fac,
1312 sizeof(fac)) ? -EFAULT : 0;
1313 break;
1314 }
1315
1316 case SIOCX25SFACILITIES: {
1317 struct x25_facilities facilities;
1318 rc = -EFAULT;
1319 if (copy_from_user(&facilities, argp,
1320 sizeof(facilities)))
1321 break;
1322 rc = -EINVAL;
1323 if (sk->sk_state != TCP_LISTEN &&
1324 sk->sk_state != TCP_CLOSE)
1325 break;
1326 if (facilities.pacsize_in < X25_PS16 ||
1327 facilities.pacsize_in > X25_PS4096)
1328 break;
1329 if (facilities.pacsize_out < X25_PS16 ||
1330 facilities.pacsize_out > X25_PS4096)
1331 break;
1332 if (facilities.winsize_in < 1 ||
1333 facilities.winsize_in > 127)
1334 break;
1335 if (facilities.throughput < 0x03 ||
1336 facilities.throughput > 0xDD)
1337 break;
ebc3f64b
SP		 1338 if (facilities.reverse &&
1339 (facilities.reverse | 0x81)!= 0x81)
1da177e4
LT		 1340 break;
1341 x25->facilities = facilities;
1342 rc = 0;
1343 break;
1344 }
1345
a64b7b93
SP		 1346 case SIOCX25GDTEFACILITIES: {
1347 rc = copy_to_user(argp, &x25->dte_facilities,
1348 sizeof(x25->dte_facilities));
1349 if (rc)
1350 rc = -EFAULT;
1351 break;
1352 }
1353
1354 case SIOCX25SDTEFACILITIES: {
1355 struct x25_dte_facilities dtefacs;
1356 rc = -EFAULT;
1357 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1358 break;
1359 rc = -EINVAL;
1360 if (sk->sk_state != TCP_LISTEN &&
1361 sk->sk_state != TCP_CLOSE)
1362 break;
1363 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1364 break;
1365 if (dtefacs.calling_ae == NULL)
1366 break;
1367 if (dtefacs.called_len > X25_MAX_AE_LEN)
1368 break;
1369 if (dtefacs.called_ae == NULL)
1370 break;
1371 x25->dte_facilities = dtefacs;
1372 rc = 0;
1373 break;
1374 }
1375
1da177e4
LT		 1376 case SIOCX25GCALLUSERDATA: {
1377 struct x25_calluserdata cud = x25->calluserdata;
1378 rc = copy_to_user(argp, &cud,
1379 sizeof(cud)) ? -EFAULT : 0;
1380 break;
1381 }
1382
1383 case SIOCX25SCALLUSERDATA: {
1384 struct x25_calluserdata calluserdata;
1385
1386 rc = -EFAULT;
1387 if (copy_from_user(&calluserdata, argp,
1388 sizeof(calluserdata)))
1389 break;
1390 rc = -EINVAL;
1391 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1392 break;
1393 x25->calluserdata = calluserdata;
1394 rc = 0;
1395 break;
1396 }
1397
1398 case SIOCX25GCAUSEDIAG: {
1399 struct x25_causediag causediag;
1400 causediag = x25->causediag;
1401 rc = copy_to_user(argp, &causediag,
1402 sizeof(causediag)) ? -EFAULT : 0;
1403 break;
1404 }
1405
cb65d506
SP		 1406 case SIOCX25SCUDMATCHLEN: {
1407 struct x25_subaddr sub_addr;
1408 rc = -EINVAL;
1409 if(sk->sk_state != TCP_CLOSE)
1410 break;
1411 rc = -EFAULT;
1412 if (copy_from_user(&sub_addr, argp,
1413 sizeof(sub_addr)))
1414 break;
1415 rc = -EINVAL;
1416 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1417 break;
1418 x25->cudmatchlength = sub_addr.cudmatchlength;
1419 rc = 0;
1420 break;
1421 }
1422
ebc3f64b
SP		 1423 case SIOCX25CALLACCPTAPPRV: {
1424 rc = -EINVAL;
1425 if (sk->sk_state != TCP_CLOSE)
1426 break;
1427 x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1428 rc = 0;
1429 break;
1430 }
1431
1432 case SIOCX25SENDCALLACCPT: {
1433 rc = -EINVAL;
1434 if (sk->sk_state != TCP_ESTABLISHED)
1435 break;
1436 if (x25->accptapprv) /* must call accptapprv above */
1437 break;
1438 x25_write_internal(sk, X25_CALL_ACCEPTED);
1439 x25->state = X25_STATE_3;
1440 rc = 0;
1441 break;
1442 }
1443
1da177e4 1444 default:
b5e5fa5e 1445 rc = -ENOIOCTLCMD;
1da177e4
LT		 1446 break;
1447 }
1448
1449 return rc;
1450}
1451
1452static struct net_proto_family x25_family_ops = {
1453 .family = AF_X25,
1454 .create = x25_create,
1455 .owner = THIS_MODULE,
1456};
1457
1b06e6ba
SP		 1458#ifdef CONFIG_COMPAT
1459static int compat_x25_subscr_ioctl(unsigned int cmd,
1460 struct compat_x25_subscrip_struct __user *x25_subscr32)
1461{
1462 struct compat_x25_subscrip_struct x25_subscr;
1463 struct x25_neigh *nb;
1464 struct net_device *dev;
1465 int rc = -EINVAL;
1466
1467 rc = -EFAULT;
1468 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1469 goto out;
1470
1471 rc = -EINVAL;
1472 dev = x25_dev_get(x25_subscr.device);
1473 if (dev == NULL)
1474 goto out;
1475
1476 nb = x25_get_neigh(dev);
1477 if (nb == NULL)
1478 goto out_dev_put;
1479
1480 dev_put(dev);
1481
1482 if (cmd == SIOCX25GSUBSCRIP) {
1483 x25_subscr.extended = nb->extended;
1484 x25_subscr.global_facil_mask = nb->global_facil_mask;
1485 rc = copy_to_user(x25_subscr32, &x25_subscr,
1486 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1487 } else {
1488 rc = -EINVAL;
1489 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1490 rc = 0;
1491 nb->extended = x25_subscr.extended;
1492 nb->global_facil_mask = x25_subscr.global_facil_mask;
1493 }
1494 }
1495 x25_neigh_put(nb);
1496out:
1497 return rc;
1498out_dev_put:
1499 dev_put(dev);
1500 goto out;
1501}
1502
1503static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1504 unsigned long arg)
1505{
1506 void __user *argp = compat_ptr(arg);
1507 struct sock *sk = sock->sk;
1508
1509 int rc = -ENOIOCTLCMD;
1510
1511 switch(cmd) {
1512 case TIOCOUTQ:
1513 case TIOCINQ:
1514 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1515 break;
1516 case SIOCGSTAMP:
1517 rc = -EINVAL;
1518 if (sk)
1519 rc = compat_sock_get_timestamp(sk,
1520 (struct timeval __user*)argp);
1521 break;
1522 case SIOCGIFADDR:
1523 case SIOCSIFADDR:
1524 case SIOCGIFDSTADDR:
1525 case SIOCSIFDSTADDR:
1526 case SIOCGIFBRDADDR:
1527 case SIOCSIFBRDADDR:
1528 case SIOCGIFNETMASK:
1529 case SIOCSIFNETMASK:
1530 case SIOCGIFMETRIC:
1531 case SIOCSIFMETRIC:
1532 rc = -EINVAL;
1533 break;
1534 case SIOCADDRT:
1535 case SIOCDELRT:
1536 rc = -EPERM;
1537 if (!capable(CAP_NET_ADMIN))
1538 break;
1539 rc = x25_route_ioctl(cmd, argp);
1540 break;
1541 case SIOCX25GSUBSCRIP:
1542 rc = compat_x25_subscr_ioctl(cmd, argp);
1543 break;
1544 case SIOCX25SSUBSCRIP:
1545 rc = -EPERM;
1546 if (!capable(CAP_NET_ADMIN))
1547 break;
1548 rc = compat_x25_subscr_ioctl(cmd, argp);
1549 break;
1550 case SIOCX25GFACILITIES:
1551 case SIOCX25SFACILITIES:
9a6b9f2e
SP		 1552 case SIOCX25GDTEFACILITIES:
1553 case SIOCX25SDTEFACILITIES:
1b06e6ba
SP		 1554 case SIOCX25GCALLUSERDATA:
1555 case SIOCX25SCALLUSERDATA:
1556 case SIOCX25GCAUSEDIAG:
1557 case SIOCX25SCUDMATCHLEN:
1558 case SIOCX25CALLACCPTAPPRV:
1559 case SIOCX25SENDCALLACCPT:
1560 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1561 break;
1562 default:
1563 rc = -ENOIOCTLCMD;
1564 break;
1565 }
1566 return rc;
1567}
1568#endif
1569
90ddc4f0 1570static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1da177e4
LT		 1571 .family = AF_X25,
1572 .owner = THIS_MODULE,
1573 .release = x25_release,
1574 .bind = x25_bind,
1575 .connect = x25_connect,
1576 .socketpair = sock_no_socketpair,
1577 .accept = x25_accept,
1578 .getname = x25_getname,
1579 .poll = datagram_poll,
1580 .ioctl = x25_ioctl,
1b06e6ba
SP		 1581#ifdef CONFIG_COMPAT
1582 .compat_ioctl = compat_x25_ioctl,
1583#endif
1da177e4
LT		 1584 .listen = x25_listen,
1585 .shutdown = sock_no_shutdown,
1586 .setsockopt = x25_setsockopt,
1587 .getsockopt = x25_getsockopt,
1588 .sendmsg = x25_sendmsg,
1589 .recvmsg = x25_recvmsg,
1590 .mmap = sock_no_mmap,
1591 .sendpage = sock_no_sendpage,
1592};
1593
1594#include <linux/smp_lock.h>
1595SOCKOPS_WRAP(x25_proto, AF_X25);
1596
1597static struct packet_type x25_packet_type = {
1598 .type = __constant_htons(ETH_P_X25),
1599 .func = x25_lapb_receive_frame,
1600};
1601
1602static struct notifier_block x25_dev_notifier = {
1603 .notifier_call = x25_device_event,
1604};
1605
1606void x25_kill_by_neigh(struct x25_neigh *nb)
1607{
1608 struct sock *s;
1609 struct hlist_node *node;
1610
1611 write_lock_bh(&x25_list_lock);
1612
1613 sk_for_each(s, node, &x25_list)
1614 if (x25_sk(s)->neighbour == nb)
1615 x25_disconnect(s, ENETUNREACH, 0, 0);
1616
1617 write_unlock_bh(&x25_list_lock);
95a9dc43
AH		 1618
1619 /* Remove any related forwards */
1620 x25_clear_forward_by_dev(nb->dev);
1da177e4
LT		 1621}
1622
1623static int __init x25_init(void)
1624{
1625 int rc = proto_register(&x25_proto, 0);
1626
1627 if (rc != 0)
1628 goto out;
1629
1630 sock_register(&x25_family_ops);
1631
1632 dev_add_pack(&x25_packet_type);
1633
1634 register_netdevice_notifier(&x25_dev_notifier);
1635
1636 printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1637
1638#ifdef CONFIG_SYSCTL
1639 x25_register_sysctl();
1640#endif
1641 x25_proc_init();
1642out:
1643 return rc;
1644}
1645module_init(x25_init);
1646
1647static void __exit x25_exit(void)
1648{
1649 x25_proc_exit();
1650 x25_link_free();
1651 x25_route_free();
1652
1653#ifdef CONFIG_SYSCTL
1654 x25_unregister_sysctl();
1655#endif
1656
1657 unregister_netdevice_notifier(&x25_dev_notifier);
1658
1659 dev_remove_pack(&x25_packet_type);
1660
1661 sock_unregister(AF_X25);
1662 proto_unregister(&x25_proto);
1663}
1664module_exit(x25_exit);
1665
1666MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1667MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1668MODULE_LICENSE("GPL");
1669MODULE_ALIAS_NETPROTO(PF_X25);
Clone of davem's net-next-2.6 tree