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[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;
1da177e4
LT		 849 int len, rc;
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 */
860 skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
861
862 /*
863 * Get the length of the facilities, skip past them for the moment
864 * get the call user data because this is needed to determine
865 * the correct listener
866 */
867 len = skb->data[0] + 1;
868 skb_pull(skb,len);
869
1da177e4
LT		 870 /*
871 * Find a listener for the particular address/cud pair.
872 */
cb65d506
SP		 873 sk = x25_find_listener(&source_addr,skb);
874 skb_push(skb,len);
1da177e4
LT		 875
876 /*
877 * We can't accept the Call Request.
878 */
879 if (sk == NULL || sk_acceptq_is_full(sk))
880 goto out_clear_request;
881
882 /*
883 * Try to reach a compromise on the requested facilities.
884 */
a64b7b93
SP		 885 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
886 if (len == -1)
1da177e4
LT		 887 goto out_sock_put;
888
889 /*
890 * current neighbour/link might impose additional limits
891 * on certain facilties
892 */
893
894 x25_limit_facilities(&facilities, nb);
895
896 /*
897 * Try to create a new socket.
898 */
899 make = x25_make_new(sk);
900 if (!make)
901 goto out_sock_put;
902
903 /*
904 * Remove the facilities
905 */
906 skb_pull(skb, len);
907
908 skb->sk = make;
909 make->sk_state = TCP_ESTABLISHED;
910
911 makex25 = x25_sk(make);
912 makex25->lci = lci;
913 makex25->dest_addr = dest_addr;
914 makex25->source_addr = source_addr;
915 makex25->neighbour = nb;
916 makex25->facilities = facilities;
a64b7b93 917 makex25->dte_facilities= dte_facilities;
1da177e4 918 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
cb65d506
SP		 919 /* ensure no reverse facil on accept */
920 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
a64b7b93
SP		 921 /* ensure no calling address extension on accept */
922 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
cb65d506 923 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1da177e4 924
ebc3f64b
SP		 925 /* Normally all calls are accepted immediatly */
926 if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
927 x25_write_internal(make, X25_CALL_ACCEPTED);
928 makex25->state = X25_STATE_3;
929 }
1da177e4 930
cb65d506
SP		 931 /*
932 * Incoming Call User Data.
933 */
934 if (skb->len >= 0) {
935 memcpy(makex25->calluserdata.cuddata, skb->data, skb->len);
936 makex25->calluserdata.cudlength = skb->len;
937 }
938
1da177e4
LT		 939 sk->sk_ack_backlog++;
940
941 x25_insert_socket(make);
942
943 skb_queue_head(&sk->sk_receive_queue, skb);
944
945 x25_start_heartbeat(make);
946
947 if (!sock_flag(sk, SOCK_DEAD))
948 sk->sk_data_ready(sk, skb->len);
949 rc = 1;
950 sock_put(sk);
951out:
952 return rc;
953out_sock_put:
954 sock_put(sk);
955out_clear_request:
956 rc = 0;
957 x25_transmit_clear_request(nb, lci, 0x01);
958 goto out;
959}
960
961static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
962 struct msghdr *msg, size_t len)
963{
964 struct sock *sk = sock->sk;
965 struct x25_sock *x25 = x25_sk(sk);
966 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
967 struct sockaddr_x25 sx25;
968 struct sk_buff *skb;
969 unsigned char *asmptr;
970 int noblock = msg->msg_flags & MSG_DONTWAIT;
971 size_t size;
972 int qbit = 0, rc = -EINVAL;
973
974 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
975 goto out;
976
977 /* we currently don't support segmented records at the user interface */
978 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
979 goto out;
980
981 rc = -EADDRNOTAVAIL;
982 if (sock_flag(sk, SOCK_ZAPPED))
983 goto out;
984
985 rc = -EPIPE;
986 if (sk->sk_shutdown & SEND_SHUTDOWN) {
987 send_sig(SIGPIPE, current, 0);
988 goto out;
989 }
990
991 rc = -ENETUNREACH;
992 if (!x25->neighbour)
993 goto out;
994
995 if (usx25) {
996 rc = -EINVAL;
997 if (msg->msg_namelen < sizeof(sx25))
998 goto out;
999 memcpy(&sx25, usx25, sizeof(sx25));
1000 rc = -EISCONN;
1001 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1002 goto out;
1003 rc = -EINVAL;
1004 if (sx25.sx25_family != AF_X25)
1005 goto out;
1006 } else {
1007 /*
1008 * FIXME 1003.1g - if the socket is like this because
1009 * it has become closed (not started closed) we ought
1010 * to SIGPIPE, EPIPE;
1011 */
1012 rc = -ENOTCONN;
1013 if (sk->sk_state != TCP_ESTABLISHED)
1014 goto out;
1015
1016 sx25.sx25_family = AF_X25;
1017 sx25.sx25_addr = x25->dest_addr;
1018 }
1019
1020 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1021
1022 /* Build a packet */
1023 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1024
1025 if ((msg->msg_flags & MSG_OOB) && len > 32)
1026 len = 32;
1027
1028 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1029
1030 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1031 if (!skb)
1032 goto out;
1033 X25_SKB_CB(skb)->flags = msg->msg_flags;
1034
1035 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1036
1037 /*
1038 * Put the data on the end
1039 */
1040 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1041
1042 asmptr = skb->h.raw = skb_put(skb, len);
1043
1044 rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
1045 if (rc)
1046 goto out_kfree_skb;
1047
1048 /*
1049 * If the Q BIT Include socket option is in force, the first
1050 * byte of the user data is the logical value of the Q Bit.
1051 */
1052 if (x25->qbitincl) {
1053 qbit = skb->data[0];
1054 skb_pull(skb, 1);
1055 }
1056
1057 /*
1058 * Push down the X.25 header
1059 */
1060 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1061
1062 if (msg->msg_flags & MSG_OOB) {
1063 if (x25->neighbour->extended) {
1064 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1065 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1066 *asmptr++ = (x25->lci >> 0) & 0xFF;
1067 *asmptr++ = X25_INTERRUPT;
1068 } else {
1069 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1070 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1071 *asmptr++ = (x25->lci >> 0) & 0xFF;
1072 *asmptr++ = X25_INTERRUPT;
1073 }
1074 } else {
1075 if (x25->neighbour->extended) {
1076 /* Build an Extended X.25 header */
1077 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1078 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1079 *asmptr++ = (x25->lci >> 0) & 0xFF;
1080 *asmptr++ = X25_DATA;
1081 *asmptr++ = X25_DATA;
1082 } else {
1083 /* Build an Standard X.25 header */
1084 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1085 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1086 *asmptr++ = (x25->lci >> 0) & 0xFF;
1087 *asmptr++ = X25_DATA;
1088 }
1089
1090 if (qbit)
1091 skb->data[0] |= X25_Q_BIT;
1092 }
1093
1094 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1095 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1096
1097 rc = -ENOTCONN;
1098 if (sk->sk_state != TCP_ESTABLISHED)
1099 goto out_kfree_skb;
1100
1101 if (msg->msg_flags & MSG_OOB)
1102 skb_queue_tail(&x25->interrupt_out_queue, skb);
1103 else {
1104 len = x25_output(sk, skb);
1105 if (len < 0)
1106 kfree_skb(skb);
1107 else if (x25->qbitincl)
1108 len++;
1109 }
1110
1111 /*
1112 * lock_sock() is currently only used to serialize this x25_kick()
1113 * against input-driven x25_kick() calls. It currently only blocks
1114 * incoming packets for this socket and does not protect against
1115 * any other socket state changes and is not called from anywhere
1116 * else. As x25_kick() cannot block and as long as all socket
1117 * operations are BKL-wrapped, we don't need take to care about
1118 * purging the backlog queue in x25_release().
1119 *
1120 * Using lock_sock() to protect all socket operations entirely
1121 * (and making the whole x25 stack SMP aware) unfortunately would
1122 * require major changes to {send,recv}msg and skb allocation methods.
1123 * -> 2.5 ;)
1124 */
1125 lock_sock(sk);
1126 x25_kick(sk);
1127 release_sock(sk);
1128 rc = len;
1129out:
1130 return rc;
1131out_kfree_skb:
1132 kfree_skb(skb);
1133 goto out;
1134}
1135
1136
1137static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1138 struct msghdr *msg, size_t size,
1139 int flags)
1140{
1141 struct sock *sk = sock->sk;
1142 struct x25_sock *x25 = x25_sk(sk);
1143 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1144 size_t copied;
1145 int qbit;
1146 struct sk_buff *skb;
1147 unsigned char *asmptr;
1148 int rc = -ENOTCONN;
1149
1150 /*
1151 * This works for seqpacket too. The receiver has ordered the queue for
1152 * us! We do one quick check first though
1153 */
1154 if (sk->sk_state != TCP_ESTABLISHED)
1155 goto out;
1156
1157 if (flags & MSG_OOB) {
1158 rc = -EINVAL;
1159 if (sock_flag(sk, SOCK_URGINLINE) ||
1160 !skb_peek(&x25->interrupt_in_queue))
1161 goto out;
1162
1163 skb = skb_dequeue(&x25->interrupt_in_queue);
1164
1165 skb_pull(skb, X25_STD_MIN_LEN);
1166
1167 /*
1168 * No Q bit information on Interrupt data.
1169 */
1170 if (x25->qbitincl) {
1171 asmptr = skb_push(skb, 1);
1172 *asmptr = 0x00;
1173 }
1174
1175 msg->msg_flags |= MSG_OOB;
1176 } else {
1177 /* Now we can treat all alike */
1178 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1179 flags & MSG_DONTWAIT, &rc);
1180 if (!skb)
1181 goto out;
1182
1183 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1184
1185 skb_pull(skb, x25->neighbour->extended ?
1186 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1187
1188 if (x25->qbitincl) {
1189 asmptr = skb_push(skb, 1);
1190 *asmptr = qbit;
1191 }
1192 }
1193
1194 skb->h.raw = skb->data;
1195
1196 copied = skb->len;
1197
1198 if (copied > size) {
1199 copied = size;
1200 msg->msg_flags |= MSG_TRUNC;
1201 }
1202
1203 /* Currently, each datagram always contains a complete record */
1204 msg->msg_flags |= MSG_EOR;
1205
1206 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1207 if (rc)
1208 goto out_free_dgram;
1209
1210 if (sx25) {
1211 sx25->sx25_family = AF_X25;
1212 sx25->sx25_addr = x25->dest_addr;
1213 }
1214
1215 msg->msg_namelen = sizeof(struct sockaddr_x25);
1216
1217 lock_sock(sk);
1218 x25_check_rbuf(sk);
1219 release_sock(sk);
1220 rc = copied;
1221out_free_dgram:
1222 skb_free_datagram(sk, skb);
1223out:
1224 return rc;
1225}
1226
1227
1228static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1229{
1230 struct sock *sk = sock->sk;
1231 struct x25_sock *x25 = x25_sk(sk);
1232 void __user *argp = (void __user *)arg;
1233 int rc;
1234
1235 switch (cmd) {
1236 case TIOCOUTQ: {
1237 int amount = sk->sk_sndbuf -
1238 atomic_read(&sk->sk_wmem_alloc);
1239 if (amount < 0)
1240 amount = 0;
1241 rc = put_user(amount, (unsigned int __user *)argp);
1242 break;
1243 }
1244
1245 case TIOCINQ: {
1246 struct sk_buff *skb;
1247 int amount = 0;
1248 /*
1249 * These two are safe on a single CPU system as
1250 * only user tasks fiddle here
1251 */
1252 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1253 amount = skb->len;
1254 rc = put_user(amount, (unsigned int __user *)argp);
1255 break;
1256 }
1257
1258 case SIOCGSTAMP:
1259 rc = -EINVAL;
1260 if (sk)
1261 rc = sock_get_timestamp(sk,
1262 (struct timeval __user *)argp);
1263 break;
1264 case SIOCGIFADDR:
1265 case SIOCSIFADDR:
1266 case SIOCGIFDSTADDR:
1267 case SIOCSIFDSTADDR:
1268 case SIOCGIFBRDADDR:
1269 case SIOCSIFBRDADDR:
1270 case SIOCGIFNETMASK:
1271 case SIOCSIFNETMASK:
1272 case SIOCGIFMETRIC:
1273 case SIOCSIFMETRIC:
1274 rc = -EINVAL;
1275 break;
1276 case SIOCADDRT:
1277 case SIOCDELRT:
1278 rc = -EPERM;
1279 if (!capable(CAP_NET_ADMIN))
1280 break;
1281 rc = x25_route_ioctl(cmd, argp);
1282 break;
1283 case SIOCX25GSUBSCRIP:
1284 rc = x25_subscr_ioctl(cmd, argp);
1285 break;
1286 case SIOCX25SSUBSCRIP:
1287 rc = -EPERM;
1288 if (!capable(CAP_NET_ADMIN))
1289 break;
1290 rc = x25_subscr_ioctl(cmd, argp);
1291 break;
1292 case SIOCX25GFACILITIES: {
1293 struct x25_facilities fac = x25->facilities;
1294 rc = copy_to_user(argp, &fac,
1295 sizeof(fac)) ? -EFAULT : 0;
1296 break;
1297 }
1298
1299 case SIOCX25SFACILITIES: {
1300 struct x25_facilities facilities;
1301 rc = -EFAULT;
1302 if (copy_from_user(&facilities, argp,
1303 sizeof(facilities)))
1304 break;
1305 rc = -EINVAL;
1306 if (sk->sk_state != TCP_LISTEN &&
1307 sk->sk_state != TCP_CLOSE)
1308 break;
1309 if (facilities.pacsize_in < X25_PS16 ||
1310 facilities.pacsize_in > X25_PS4096)
1311 break;
1312 if (facilities.pacsize_out < X25_PS16 ||
1313 facilities.pacsize_out > X25_PS4096)
1314 break;
1315 if (facilities.winsize_in < 1 ||
1316 facilities.winsize_in > 127)
1317 break;
1318 if (facilities.throughput < 0x03 ||
1319 facilities.throughput > 0xDD)
1320 break;
ebc3f64b
SP		 1321 if (facilities.reverse &&
1322 (facilities.reverse | 0x81)!= 0x81)
1da177e4
LT		 1323 break;
1324 x25->facilities = facilities;
1325 rc = 0;
1326 break;
1327 }
1328
a64b7b93
SP		 1329 case SIOCX25GDTEFACILITIES: {
1330 rc = copy_to_user(argp, &x25->dte_facilities,
1331 sizeof(x25->dte_facilities));
1332 if (rc)
1333 rc = -EFAULT;
1334 break;
1335 }
1336
1337 case SIOCX25SDTEFACILITIES: {
1338 struct x25_dte_facilities dtefacs;
1339 rc = -EFAULT;
1340 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1341 break;
1342 rc = -EINVAL;
1343 if (sk->sk_state != TCP_LISTEN &&
1344 sk->sk_state != TCP_CLOSE)
1345 break;
1346 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1347 break;
1348 if (dtefacs.calling_ae == NULL)
1349 break;
1350 if (dtefacs.called_len > X25_MAX_AE_LEN)
1351 break;
1352 if (dtefacs.called_ae == NULL)
1353 break;
1354 x25->dte_facilities = dtefacs;
1355 rc = 0;
1356 break;
1357 }
1358
1da177e4
LT		 1359 case SIOCX25GCALLUSERDATA: {
1360 struct x25_calluserdata cud = x25->calluserdata;
1361 rc = copy_to_user(argp, &cud,
1362 sizeof(cud)) ? -EFAULT : 0;
1363 break;
1364 }
1365
1366 case SIOCX25SCALLUSERDATA: {
1367 struct x25_calluserdata calluserdata;
1368
1369 rc = -EFAULT;
1370 if (copy_from_user(&calluserdata, argp,
1371 sizeof(calluserdata)))
1372 break;
1373 rc = -EINVAL;
1374 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1375 break;
1376 x25->calluserdata = calluserdata;
1377 rc = 0;
1378 break;
1379 }
1380
1381 case SIOCX25GCAUSEDIAG: {
1382 struct x25_causediag causediag;
1383 causediag = x25->causediag;
1384 rc = copy_to_user(argp, &causediag,
1385 sizeof(causediag)) ? -EFAULT : 0;
1386 break;
1387 }
1388
cb65d506
SP		 1389 case SIOCX25SCUDMATCHLEN: {
1390 struct x25_subaddr sub_addr;
1391 rc = -EINVAL;
1392 if(sk->sk_state != TCP_CLOSE)
1393 break;
1394 rc = -EFAULT;
1395 if (copy_from_user(&sub_addr, argp,
1396 sizeof(sub_addr)))
1397 break;
1398 rc = -EINVAL;
1399 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1400 break;
1401 x25->cudmatchlength = sub_addr.cudmatchlength;
1402 rc = 0;
1403 break;
1404 }
1405
ebc3f64b
SP		 1406 case SIOCX25CALLACCPTAPPRV: {
1407 rc = -EINVAL;
1408 if (sk->sk_state != TCP_CLOSE)
1409 break;
1410 x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1411 rc = 0;
1412 break;
1413 }
1414
1415 case SIOCX25SENDCALLACCPT: {
1416 rc = -EINVAL;
1417 if (sk->sk_state != TCP_ESTABLISHED)
1418 break;
1419 if (x25->accptapprv) /* must call accptapprv above */
1420 break;
1421 x25_write_internal(sk, X25_CALL_ACCEPTED);
1422 x25->state = X25_STATE_3;
1423 rc = 0;
1424 break;
1425 }
1426
1da177e4 1427 default:
b5e5fa5e 1428 rc = -ENOIOCTLCMD;
1da177e4
LT		 1429 break;
1430 }
1431
1432 return rc;
1433}
1434
1435static struct net_proto_family x25_family_ops = {
1436 .family = AF_X25,
1437 .create = x25_create,
1438 .owner = THIS_MODULE,
1439};
1440
1b06e6ba
SP		 1441#ifdef CONFIG_COMPAT
1442static int compat_x25_subscr_ioctl(unsigned int cmd,
1443 struct compat_x25_subscrip_struct __user *x25_subscr32)
1444{
1445 struct compat_x25_subscrip_struct x25_subscr;
1446 struct x25_neigh *nb;
1447 struct net_device *dev;
1448 int rc = -EINVAL;
1449
1450 rc = -EFAULT;
1451 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1452 goto out;
1453
1454 rc = -EINVAL;
1455 dev = x25_dev_get(x25_subscr.device);
1456 if (dev == NULL)
1457 goto out;
1458
1459 nb = x25_get_neigh(dev);
1460 if (nb == NULL)
1461 goto out_dev_put;
1462
1463 dev_put(dev);
1464
1465 if (cmd == SIOCX25GSUBSCRIP) {
1466 x25_subscr.extended = nb->extended;
1467 x25_subscr.global_facil_mask = nb->global_facil_mask;
1468 rc = copy_to_user(x25_subscr32, &x25_subscr,
1469 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1470 } else {
1471 rc = -EINVAL;
1472 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1473 rc = 0;
1474 nb->extended = x25_subscr.extended;
1475 nb->global_facil_mask = x25_subscr.global_facil_mask;
1476 }
1477 }
1478 x25_neigh_put(nb);
1479out:
1480 return rc;
1481out_dev_put:
1482 dev_put(dev);
1483 goto out;
1484}
1485
1486static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1487 unsigned long arg)
1488{
1489 void __user *argp = compat_ptr(arg);
1490 struct sock *sk = sock->sk;
1491
1492 int rc = -ENOIOCTLCMD;
1493
1494 switch(cmd) {
1495 case TIOCOUTQ:
1496 case TIOCINQ:
1497 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1498 break;
1499 case SIOCGSTAMP:
1500 rc = -EINVAL;
1501 if (sk)
1502 rc = compat_sock_get_timestamp(sk,
1503 (struct timeval __user*)argp);
1504 break;
1505 case SIOCGIFADDR:
1506 case SIOCSIFADDR:
1507 case SIOCGIFDSTADDR:
1508 case SIOCSIFDSTADDR:
1509 case SIOCGIFBRDADDR:
1510 case SIOCSIFBRDADDR:
1511 case SIOCGIFNETMASK:
1512 case SIOCSIFNETMASK:
1513 case SIOCGIFMETRIC:
1514 case SIOCSIFMETRIC:
1515 rc = -EINVAL;
1516 break;
1517 case SIOCADDRT:
1518 case SIOCDELRT:
1519 rc = -EPERM;
1520 if (!capable(CAP_NET_ADMIN))
1521 break;
1522 rc = x25_route_ioctl(cmd, argp);
1523 break;
1524 case SIOCX25GSUBSCRIP:
1525 rc = compat_x25_subscr_ioctl(cmd, argp);
1526 break;
1527 case SIOCX25SSUBSCRIP:
1528 rc = -EPERM;
1529 if (!capable(CAP_NET_ADMIN))
1530 break;
1531 rc = compat_x25_subscr_ioctl(cmd, argp);
1532 break;
1533 case SIOCX25GFACILITIES:
1534 case SIOCX25SFACILITIES:
9a6b9f2e
SP		 1535 case SIOCX25GDTEFACILITIES:
1536 case SIOCX25SDTEFACILITIES:
1b06e6ba
SP		 1537 case SIOCX25GCALLUSERDATA:
1538 case SIOCX25SCALLUSERDATA:
1539 case SIOCX25GCAUSEDIAG:
1540 case SIOCX25SCUDMATCHLEN:
1541 case SIOCX25CALLACCPTAPPRV:
1542 case SIOCX25SENDCALLACCPT:
1543 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1544 break;
1545 default:
1546 rc = -ENOIOCTLCMD;
1547 break;
1548 }
1549 return rc;
1550}
1551#endif
1552
90ddc4f0 1553static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1da177e4
LT		 1554 .family = AF_X25,
1555 .owner = THIS_MODULE,
1556 .release = x25_release,
1557 .bind = x25_bind,
1558 .connect = x25_connect,
1559 .socketpair = sock_no_socketpair,
1560 .accept = x25_accept,
1561 .getname = x25_getname,
1562 .poll = datagram_poll,
1563 .ioctl = x25_ioctl,
1b06e6ba
SP		 1564#ifdef CONFIG_COMPAT
1565 .compat_ioctl = compat_x25_ioctl,
1566#endif
1da177e4
LT		 1567 .listen = x25_listen,
1568 .shutdown = sock_no_shutdown,
1569 .setsockopt = x25_setsockopt,
1570 .getsockopt = x25_getsockopt,
1571 .sendmsg = x25_sendmsg,
1572 .recvmsg = x25_recvmsg,
1573 .mmap = sock_no_mmap,
1574 .sendpage = sock_no_sendpage,
1575};
1576
1577#include <linux/smp_lock.h>
1578SOCKOPS_WRAP(x25_proto, AF_X25);
1579
1580static struct packet_type x25_packet_type = {
1581 .type = __constant_htons(ETH_P_X25),
1582 .func = x25_lapb_receive_frame,
1583};
1584
1585static struct notifier_block x25_dev_notifier = {
1586 .notifier_call = x25_device_event,
1587};
1588
1589void x25_kill_by_neigh(struct x25_neigh *nb)
1590{
1591 struct sock *s;
1592 struct hlist_node *node;
1593
1594 write_lock_bh(&x25_list_lock);
1595
1596 sk_for_each(s, node, &x25_list)
1597 if (x25_sk(s)->neighbour == nb)
1598 x25_disconnect(s, ENETUNREACH, 0, 0);
1599
1600 write_unlock_bh(&x25_list_lock);
1601}
1602
1603static int __init x25_init(void)
1604{
1605 int rc = proto_register(&x25_proto, 0);
1606
1607 if (rc != 0)
1608 goto out;
1609
1610 sock_register(&x25_family_ops);
1611
1612 dev_add_pack(&x25_packet_type);
1613
1614 register_netdevice_notifier(&x25_dev_notifier);
1615
1616 printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1617
1618#ifdef CONFIG_SYSCTL
1619 x25_register_sysctl();
1620#endif
1621 x25_proc_init();
1622out:
1623 return rc;
1624}
1625module_init(x25_init);
1626
1627static void __exit x25_exit(void)
1628{
1629 x25_proc_exit();
1630 x25_link_free();
1631 x25_route_free();
1632
1633#ifdef CONFIG_SYSCTL
1634 x25_unregister_sysctl();
1635#endif
1636
1637 unregister_netdevice_notifier(&x25_dev_notifier);
1638
1639 dev_remove_pack(&x25_packet_type);
1640
1641 sock_unregister(AF_X25);
1642 proto_unregister(&x25_proto);
1643}
1644module_exit(x25_exit);
1645
1646MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1647MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1648MODULE_LICENSE("GPL");
1649MODULE_ALIAS_NETPROTO(PF_X25);
Clone of davem's net-next-2.6 tree