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x25: Patch to fix bug 15678 - x25 accesses fields beyond end of packet.
[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
f8e1d201 6 * screw up. It might even work.
1da177e4
LT		 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.
f8e1d201
YH		 21 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of
22 * facilities negotiation and increased
1da177e4
LT		 23 * the throughput upper limit.
24 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups
f8e1d201 25 * 2000-09-04 Henner Eisen Set sock->state in x25_accept().
1da177e4
LT		 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>
405f5571 43#include <linux/smp_lock.h>
1da177e4
LT		 44#include <linux/timer.h>
45#include <linux/string.h>
46#include <linux/net.h>
47#include <linux/netdevice.h>
48#include <linux/if_arp.h>
49#include <linux/skbuff.h>
50#include <net/sock.h>
c752f073 51#include <net/tcp_states.h>
1da177e4
LT		 52#include <asm/uaccess.h>
53#include <linux/fcntl.h>
54#include <linux/termios.h> /* For TIOCINQ/OUTQ */
55#include <linux/notifier.h>
56#include <linux/init.h>
1b06e6ba 57#include <linux/compat.h>
a9288525 58#include <linux/ctype.h>
1b06e6ba 59
1da177e4 60#include <net/x25.h>
1b06e6ba 61#include <net/compat.h>
1da177e4
LT		 62
63int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
64int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
65int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
66int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
67int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
39e21c0d 68int sysctl_x25_forward = 0;
1da177e4
LT		 69
70HLIST_HEAD(x25_list);
71DEFINE_RWLOCK(x25_list_lock);
72
90ddc4f0 73static const struct proto_ops x25_proto_ops;
1da177e4
LT		 74
75static struct x25_address null_x25_address = {" "};
76
1b06e6ba
SP		 77#ifdef CONFIG_COMPAT
78struct compat_x25_subscrip_struct {
79 char device[200-sizeof(compat_ulong_t)];
80 compat_ulong_t global_facil_mask;
81 compat_uint_t extended;
82};
83#endif
84
f5eb917b
JH		 85
86int x25_parse_address_block(struct sk_buff *skb,
87 struct x25_address *called_addr,
88 struct x25_address *calling_addr)
89{
90 unsigned char len;
91 int needed;
92 int rc;
93
94 if (skb->len < 1) {
95 /* packet has no address block */
96 rc = 0;
97 goto empty;
98 }
99
100 len = *skb->data;
101 needed = 1 + (len >> 4) + (len & 0x0f);
102
103 if (skb->len < needed) {
104 /* packet is too short to hold the addresses it claims
105 to hold */
106 rc = -1;
107 goto empty;
108 }
109
110 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
111
112empty:
113 *called_addr->x25_addr = 0;
114 *calling_addr->x25_addr = 0;
115
116 return rc;
117}
118
119
1da177e4
LT		 120int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
121 struct x25_address *calling_addr)
122{
6bf1574e 123 unsigned int called_len, calling_len;
1da177e4 124 char *called, *calling;
6bf1574e 125 unsigned int i;
1da177e4
LT		 126
127 called_len = (*p >> 0) & 0x0F;
128 calling_len = (*p >> 4) & 0x0F;
129
130 called = called_addr->x25_addr;
131 calling = calling_addr->x25_addr;
132 p++;
133
134 for (i = 0; i < (called_len + calling_len); i++) {
135 if (i < called_len) {
136 if (i % 2 != 0) {
137 *called++ = ((*p >> 0) & 0x0F) + '0';
138 p++;
139 } else {
140 *called++ = ((*p >> 4) & 0x0F) + '0';
141 }
142 } else {
143 if (i % 2 != 0) {
144 *calling++ = ((*p >> 0) & 0x0F) + '0';
145 p++;
146 } else {
147 *calling++ = ((*p >> 4) & 0x0F) + '0';
148 }
149 }
150 }
151
152 *called = *calling = '\0';
153
154 return 1 + (called_len + calling_len + 1) / 2;
155}
156
157int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
158 struct x25_address *calling_addr)
159{
160 unsigned int called_len, calling_len;
161 char *called, *calling;
162 int i;
163
164 called = called_addr->x25_addr;
165 calling = calling_addr->x25_addr;
166
167 called_len = strlen(called);
168 calling_len = strlen(calling);
169
170 *p++ = (calling_len << 4) | (called_len << 0);
171
172 for (i = 0; i < (called_len + calling_len); i++) {
173 if (i < called_len) {
174 if (i % 2 != 0) {
175 *p |= (*called++ - '0') << 0;
176 p++;
177 } else {
178 *p = 0x00;
179 *p |= (*called++ - '0') << 4;
180 }
181 } else {
182 if (i % 2 != 0) {
183 *p |= (*calling++ - '0') << 0;
184 p++;
185 } else {
186 *p = 0x00;
187 *p |= (*calling++ - '0') << 4;
188 }
189 }
190 }
191
192 return 1 + (called_len + calling_len + 1) / 2;
193}
194
195/*
196 * Socket removal during an interrupt is now safe.
197 */
198static void x25_remove_socket(struct sock *sk)
199{
200 write_lock_bh(&x25_list_lock);
201 sk_del_node_init(sk);
202 write_unlock_bh(&x25_list_lock);
203}
204
205/*
206 * Kill all bound sockets on a dropped device.
207 */
208static void x25_kill_by_device(struct net_device *dev)
209{
210 struct sock *s;
211 struct hlist_node *node;
212
213 write_lock_bh(&x25_list_lock);
214
215 sk_for_each(s, node, &x25_list)
216 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
217 x25_disconnect(s, ENETUNREACH, 0, 0);
218
219 write_unlock_bh(&x25_list_lock);
220}
221
222/*
223 * Handle device status changes.
224 */
225static int x25_device_event(struct notifier_block *this, unsigned long event,
226 void *ptr)
227{
228 struct net_device *dev = ptr;
229 struct x25_neigh *nb;
230
721499e8 231 if (!net_eq(dev_net(dev), &init_net))
e9dc8653
EB		 232 return NOTIFY_DONE;
233
1da177e4
LT		 234 if (dev->type == ARPHRD_X25
235#if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
236 || dev->type == ARPHRD_ETHER
237#endif
238 ) {
239 switch (event) {
240 case NETDEV_UP:
241 x25_link_device_up(dev);
242 break;
243 case NETDEV_GOING_DOWN:
244 nb = x25_get_neigh(dev);
245 if (nb) {
246 x25_terminate_link(nb);
247 x25_neigh_put(nb);
248 }
249 break;
250 case NETDEV_DOWN:
251 x25_kill_by_device(dev);
252 x25_route_device_down(dev);
253 x25_link_device_down(dev);
254 break;
255 }
256 }
257
258 return NOTIFY_DONE;
259}
260
261/*
262 * Add a socket to the bound sockets list.
263 */
264static void x25_insert_socket(struct sock *sk)
265{
266 write_lock_bh(&x25_list_lock);
267 sk_add_node(sk, &x25_list);
268 write_unlock_bh(&x25_list_lock);
269}
270
271/*
272 * Find a socket that wants to accept the Call Request we just
273 * received. Check the full list for an address/cud match.
274 * If no cuds match return the next_best thing, an address match.
275 * Note: if a listening socket has cud set it must only get calls
276 * with matching cud.
277 */
cb65d506
SP		 278static struct sock *x25_find_listener(struct x25_address *addr,
279 struct sk_buff *skb)
1da177e4
LT		 280{
281 struct sock *s;
282 struct sock *next_best;
283 struct hlist_node *node;
284
285 read_lock_bh(&x25_list_lock);
286 next_best = NULL;
287
288 sk_for_each(s, node, &x25_list)
289 if ((!strcmp(addr->x25_addr,
cb65d506
SP		 290 x25_sk(s)->source_addr.x25_addr) ||
291 !strcmp(addr->x25_addr,
292 null_x25_address.x25_addr)) &&
293 s->sk_state == TCP_LISTEN) {
1da177e4
LT		 294 /*
295 * Found a listening socket, now check the incoming
296 * call user data vs this sockets call user data
297 */
cb65d506 298 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
f8e1d201
YH		 299 if((memcmp(x25_sk(s)->calluserdata.cuddata,
300 skb->data,
cb65d506
SP		 301 x25_sk(s)->cudmatchlength)) == 0) {
302 sock_hold(s);
303 goto found;
304 }
305 } else
1da177e4 306 next_best = s;
1da177e4
LT		 307 }
308 if (next_best) {
309 s = next_best;
310 sock_hold(s);
311 goto found;
312 }
313 s = NULL;
314found:
315 read_unlock_bh(&x25_list_lock);
316 return s;
317}
318
319/*
320 * Find a connected X.25 socket given my LCI and neighbour.
321 */
322static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
323{
324 struct sock *s;
325 struct hlist_node *node;
326
327 sk_for_each(s, node, &x25_list)
328 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
329 sock_hold(s);
330 goto found;
331 }
332 s = NULL;
333found:
334 return s;
335}
336
337struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
338{
339 struct sock *s;
340
341 read_lock_bh(&x25_list_lock);
342 s = __x25_find_socket(lci, nb);
343 read_unlock_bh(&x25_list_lock);
344 return s;
345}
346
347/*
348 * Find a unique LCI for a given device.
349 */
350static unsigned int x25_new_lci(struct x25_neigh *nb)
351{
352 unsigned int lci = 1;
353 struct sock *sk;
354
355 read_lock_bh(&x25_list_lock);
356
357 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
358 sock_put(sk);
359 if (++lci == 4096) {
360 lci = 0;
361 break;
362 }
363 }
364
365 read_unlock_bh(&x25_list_lock);
366 return lci;
367}
368
369/*
370 * Deferred destroy.
371 */
14ebaf81 372static void __x25_destroy_socket(struct sock *);
1da177e4
LT		 373
374/*
375 * handler for deferred kills.
376 */
377static void x25_destroy_timer(unsigned long data)
378{
14ebaf81 379 x25_destroy_socket_from_timer((struct sock *)data);
1da177e4
LT		 380}
381
382/*
383 * This is called from user mode and the timers. Thus it protects itself
384 * against interrupt users but doesn't worry about being called during
385 * work. Once it is removed from the queue no interrupt or bottom half
386 * will touch it and we are (fairly 8-) ) safe.
387 * Not static as it's used by the timer
388 */
14ebaf81 389static void __x25_destroy_socket(struct sock *sk)
1da177e4
LT		 390{
391 struct sk_buff *skb;
392
1da177e4
LT		 393 x25_stop_heartbeat(sk);
394 x25_stop_timer(sk);
395
396 x25_remove_socket(sk);
397 x25_clear_queues(sk); /* Flush the queues */
398
399 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
400 if (skb->sk != sk) { /* A pending connection */
401 /*
402 * Queue the unaccepted socket for death
403 */
404 sock_set_flag(skb->sk, SOCK_DEAD);
405 x25_start_heartbeat(skb->sk);
406 x25_sk(skb->sk)->state = X25_STATE_0;
407 }
408
409 kfree_skb(skb);
410 }
411
c564039f 412 if (sk_has_allocations(sk)) {
1da177e4
LT		 413 /* Defer: outstanding buffers */
414 sk->sk_timer.expires = jiffies + 10 * HZ;
415 sk->sk_timer.function = x25_destroy_timer;
416 sk->sk_timer.data = (unsigned long)sk;
417 add_timer(&sk->sk_timer);
418 } else {
419 /* drop last reference so sock_put will free */
420 __sock_put(sk);
421 }
14ebaf81 422}
1da177e4 423
14ebaf81
DM		 424void x25_destroy_socket_from_timer(struct sock *sk)
425{
426 sock_hold(sk);
427 bh_lock_sock(sk);
428 __x25_destroy_socket(sk);
429 bh_unlock_sock(sk);
430 sock_put(sk);
431}
432
433static void x25_destroy_socket(struct sock *sk)
434{
435 sock_hold(sk);
436 lock_sock(sk);
437 __x25_destroy_socket(sk);
1da177e4
LT		 438 release_sock(sk);
439 sock_put(sk);
440}
441
442/*
443 * Handling for system calls applied via the various interfaces to a
444 * X.25 socket object.
445 */
446
447static int x25_setsockopt(struct socket *sock, int level, int optname,
b7058842 448 char __user *optval, unsigned int optlen)
1da177e4
LT		 449{
450 int opt;
451 struct sock *sk = sock->sk;
452 int rc = -ENOPROTOOPT;
453
91774904 454 lock_kernel();
1da177e4
LT		 455 if (level != SOL_X25 || optname != X25_QBITINCL)
456 goto out;
457
458 rc = -EINVAL;
459 if (optlen < sizeof(int))
460 goto out;
461
462 rc = -EFAULT;
463 if (get_user(opt, (int __user *)optval))
464 goto out;
465
466 x25_sk(sk)->qbitincl = !!opt;
467 rc = 0;
468out:
91774904 469 unlock_kernel();
1da177e4
LT		 470 return rc;
471}
472
473static int x25_getsockopt(struct socket *sock, int level, int optname,
474 char __user *optval, int __user *optlen)
475{
476 struct sock *sk = sock->sk;
477 int val, len, rc = -ENOPROTOOPT;
f8e1d201 478
91774904 479 lock_kernel();
1da177e4
LT		 480 if (level != SOL_X25 || optname != X25_QBITINCL)
481 goto out;
482
483 rc = -EFAULT;
484 if (get_user(len, optlen))
485 goto out;
486
487 len = min_t(unsigned int, len, sizeof(int));
488
489 rc = -EINVAL;
490 if (len < 0)
491 goto out;
f8e1d201 492
1da177e4
LT		 493 rc = -EFAULT;
494 if (put_user(len, optlen))
495 goto out;
496
497 val = x25_sk(sk)->qbitincl;
498 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
499out:
91774904 500 unlock_kernel();
1da177e4
LT		 501 return rc;
502}
503
504static int x25_listen(struct socket *sock, int backlog)
505{
506 struct sock *sk = sock->sk;
507 int rc = -EOPNOTSUPP;
508
91774904 509 lock_kernel();
1da177e4
LT		 510 if (sk->sk_state != TCP_LISTEN) {
511 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
512 sk->sk_max_ack_backlog = backlog;
513 sk->sk_state = TCP_LISTEN;
514 rc = 0;
515 }
91774904 516 unlock_kernel();
1da177e4
LT		 517
518 return rc;
519}
520
521static struct proto x25_proto = {
522 .name = "X25",
523 .owner = THIS_MODULE,
524 .obj_size = sizeof(struct x25_sock),
525};
526
1b8d7ae4 527static struct sock *x25_alloc_socket(struct net *net)
1da177e4
LT		 528{
529 struct x25_sock *x25;
6257ff21 530 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
1da177e4
LT		 531
532 if (!sk)
533 goto out;
534
535 sock_init_data(NULL, sk);
536
537 x25 = x25_sk(sk);
538 skb_queue_head_init(&x25->ack_queue);
539 skb_queue_head_init(&x25->fragment_queue);
540 skb_queue_head_init(&x25->interrupt_in_queue);
541 skb_queue_head_init(&x25->interrupt_out_queue);
542out:
543 return sk;
544}
545
3f378b68
EP		 546static int x25_create(struct net *net, struct socket *sock, int protocol,
547 int kern)
1da177e4
LT		 548{
549 struct sock *sk;
550 struct x25_sock *x25;
b18e7a06 551 int rc = -EAFNOSUPPORT;
1da177e4 552
09ad9bc7 553 if (!net_eq(net, &init_net))
b18e7a06 554 goto out;
555
556 rc = -ESOCKTNOSUPPORT;
557 if (sock->type != SOCK_SEQPACKET)
558 goto out;
1b8d7ae4 559
b18e7a06 560 rc = -EINVAL;
561 if (protocol)
1da177e4
LT		 562 goto out;
563
b18e7a06 564 rc = -ENOBUFS;
1b8d7ae4 565 if ((sk = x25_alloc_socket(net)) == NULL)
1da177e4
LT		 566 goto out;
567
568 x25 = x25_sk(sk);
569
570 sock_init_data(sock, sk);
571
572 x25_init_timers(sk);
573
574 sock->ops = &x25_proto_ops;
575 sk->sk_protocol = protocol;
576 sk->sk_backlog_rcv = x25_backlog_rcv;
577
578 x25->t21 = sysctl_x25_call_request_timeout;
579 x25->t22 = sysctl_x25_reset_request_timeout;
580 x25->t23 = sysctl_x25_clear_request_timeout;
581 x25->t2 = sysctl_x25_ack_holdback_timeout;
582 x25->state = X25_STATE_0;
cb65d506 583 x25->cudmatchlength = 0;
ebc3f64b
SP		 584 x25->accptapprv = X25_DENY_ACCPT_APPRV; /* normally no cud */
585 /* on call accept */
1da177e4
LT		 586
587 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
588 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
589 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
590 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
591 x25->facilities.throughput = X25_DEFAULT_THROUGHPUT;
592 x25->facilities.reverse = X25_DEFAULT_REVERSE;
f8e1d201
YH		 593 x25->dte_facilities.calling_len = 0;
594 x25->dte_facilities.called_len = 0;
595 memset(x25->dte_facilities.called_ae, '\0',
596 sizeof(x25->dte_facilities.called_ae));
597 memset(x25->dte_facilities.calling_ae, '\0',
598 sizeof(x25->dte_facilities.calling_ae));
a64b7b93 599
1da177e4
LT		 600 rc = 0;
601out:
602 return rc;
603}
604
605static struct sock *x25_make_new(struct sock *osk)
606{
607 struct sock *sk = NULL;
608 struct x25_sock *x25, *ox25;
609
610 if (osk->sk_type != SOCK_SEQPACKET)
611 goto out;
612
3b1e0a65 613 if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
1da177e4
LT		 614 goto out;
615
616 x25 = x25_sk(sk);
617
618 sk->sk_type = osk->sk_type;
1da177e4
LT		 619 sk->sk_priority = osk->sk_priority;
620 sk->sk_protocol = osk->sk_protocol;
621 sk->sk_rcvbuf = osk->sk_rcvbuf;
622 sk->sk_sndbuf = osk->sk_sndbuf;
623 sk->sk_state = TCP_ESTABLISHED;
1da177e4 624 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
a20a8554 625 sock_copy_flags(sk, osk);
1da177e4
LT		 626
627 ox25 = x25_sk(osk);
628 x25->t21 = ox25->t21;
629 x25->t22 = ox25->t22;
630 x25->t23 = ox25->t23;
631 x25->t2 = ox25->t2;
632 x25->facilities = ox25->facilities;
633 x25->qbitincl = ox25->qbitincl;
a64b7b93 634 x25->dte_facilities = ox25->dte_facilities;
cb65d506 635 x25->cudmatchlength = ox25->cudmatchlength;
ebc3f64b 636 x25->accptapprv = ox25->accptapprv;
1da177e4
LT		 637
638 x25_init_timers(sk);
639out:
640 return sk;
641}
642
643static int x25_release(struct socket *sock)
644{
645 struct sock *sk = sock->sk;
646 struct x25_sock *x25;
647
91774904 648 lock_kernel();
1da177e4
LT		 649 if (!sk)
650 goto out;
651
652 x25 = x25_sk(sk);
653
654 switch (x25->state) {
655
656 case X25_STATE_0:
657 case X25_STATE_2:
658 x25_disconnect(sk, 0, 0, 0);
659 x25_destroy_socket(sk);
660 goto out;
661
662 case X25_STATE_1:
663 case X25_STATE_3:
664 case X25_STATE_4:
665 x25_clear_queues(sk);
666 x25_write_internal(sk, X25_CLEAR_REQUEST);
667 x25_start_t23timer(sk);
668 x25->state = X25_STATE_2;
669 sk->sk_state = TCP_CLOSE;
670 sk->sk_shutdown |= SEND_SHUTDOWN;
671 sk->sk_state_change(sk);
672 sock_set_flag(sk, SOCK_DEAD);
673 sock_set_flag(sk, SOCK_DESTROY);
674 break;
675 }
676
c751e4f8 677 sock_orphan(sk);
1da177e4 678out:
91774904 679 unlock_kernel();
1da177e4
LT		 680 return 0;
681}
682
683static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
684{
685 struct sock *sk = sock->sk;
686 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
a9288525 687 int len, i, rc = 0;
1da177e4 688
91774904 689 lock_kernel();
1da177e4
LT		 690 if (!sock_flag(sk, SOCK_ZAPPED) ||
691 addr_len != sizeof(struct sockaddr_x25) ||
91774904
AB		 692 addr->sx25_family != AF_X25) {
693 rc = -EINVAL;
694 goto out;
695 }
1da177e4 696
a9288525 697 len = strlen(addr->sx25_addr.x25_addr);
698 for (i = 0; i < len; i++) {
699 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
700 rc = -EINVAL;
701 goto out;
702 }
703 }
704
1da177e4
LT		 705 x25_sk(sk)->source_addr = addr->sx25_addr;
706 x25_insert_socket(sk);
707 sock_reset_flag(sk, SOCK_ZAPPED);
708 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
91774904
AB		 709out:
710 unlock_kernel();
711 return rc;
1da177e4
LT		 712}
713
714static int x25_wait_for_connection_establishment(struct sock *sk)
715{
716 DECLARE_WAITQUEUE(wait, current);
f8e1d201 717 int rc;
1da177e4
LT		 718
719 add_wait_queue_exclusive(sk->sk_sleep, &wait);
720 for (;;) {
721 __set_current_state(TASK_INTERRUPTIBLE);
722 rc = -ERESTARTSYS;
723 if (signal_pending(current))
724 break;
725 rc = sock_error(sk);
726 if (rc) {
727 sk->sk_socket->state = SS_UNCONNECTED;
728 break;
729 }
730 rc = 0;
731 if (sk->sk_state != TCP_ESTABLISHED) {
732 release_sock(sk);
733 schedule();
734 lock_sock(sk);
735 } else
736 break;
737 }
738 __set_current_state(TASK_RUNNING);
739 remove_wait_queue(sk->sk_sleep, &wait);
740 return rc;
741}
742
743static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
744 int addr_len, int flags)
745{
746 struct sock *sk = sock->sk;
747 struct x25_sock *x25 = x25_sk(sk);
748 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
749 struct x25_route *rt;
750 int rc = 0;
751
91774904 752 lock_kernel();
1da177e4
LT		 753 lock_sock(sk);
754 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
755 sock->state = SS_CONNECTED;
756 goto out; /* Connect completed during a ERESTARTSYS event */
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; /* No reconnect on a seqpacket socket */
766 if (sk->sk_state == TCP_ESTABLISHED)
767 goto out;
768
f8e1d201 769 sk->sk_state = TCP_CLOSE;
1da177e4
LT		 770 sock->state = SS_UNCONNECTED;
771
772 rc = -EINVAL;
773 if (addr_len != sizeof(struct sockaddr_x25) ||
774 addr->sx25_family != AF_X25)
775 goto out;
776
777 rc = -ENETUNREACH;
778 rt = x25_get_route(&addr->sx25_addr);
779 if (!rt)
780 goto out;
781
782 x25->neighbour = x25_get_neigh(rt->dev);
783 if (!x25->neighbour)
784 goto out_put_route;
785
786 x25_limit_facilities(&x25->facilities, x25->neighbour);
787
788 x25->lci = x25_new_lci(x25->neighbour);
789 if (!x25->lci)
790 goto out_put_neigh;
791
792 rc = -EINVAL;
793 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
794 goto out_put_neigh;
795
796 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
797 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
798
799 x25->dest_addr = addr->sx25_addr;
800
801 /* Move to connecting socket, start sending Connect Requests */
802 sock->state = SS_CONNECTING;
803 sk->sk_state = TCP_SYN_SENT;
804
805 x25->state = X25_STATE_1;
806
807 x25_write_internal(sk, X25_CALL_REQUEST);
808
809 x25_start_heartbeat(sk);
810 x25_start_t21timer(sk);
811
812 /* Now the loop */
813 rc = -EINPROGRESS;
814 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
815 goto out_put_neigh;
816
817 rc = x25_wait_for_connection_establishment(sk);
818 if (rc)
819 goto out_put_neigh;
820
821 sock->state = SS_CONNECTED;
822 rc = 0;
823out_put_neigh:
824 if (rc)
825 x25_neigh_put(x25->neighbour);
826out_put_route:
827 x25_route_put(rt);
828out:
829 release_sock(sk);
91774904 830 unlock_kernel();
1da177e4
LT		 831 return rc;
832}
833
bac37ec8 834static int x25_wait_for_data(struct sock *sk, long timeout)
1da177e4
LT		 835{
836 DECLARE_WAITQUEUE(wait, current);
837 int rc = 0;
838
839 add_wait_queue_exclusive(sk->sk_sleep, &wait);
840 for (;;) {
841 __set_current_state(TASK_INTERRUPTIBLE);
842 if (sk->sk_shutdown & RCV_SHUTDOWN)
843 break;
844 rc = -ERESTARTSYS;
845 if (signal_pending(current))
846 break;
847 rc = -EAGAIN;
848 if (!timeout)
849 break;
850 rc = 0;
851 if (skb_queue_empty(&sk->sk_receive_queue)) {
852 release_sock(sk);
853 timeout = schedule_timeout(timeout);
854 lock_sock(sk);
855 } else
856 break;
857 }
858 __set_current_state(TASK_RUNNING);
859 remove_wait_queue(sk->sk_sleep, &wait);
860 return rc;
861}
f8e1d201 862
1da177e4
LT		 863static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
864{
865 struct sock *sk = sock->sk;
866 struct sock *newsk;
867 struct sk_buff *skb;
868 int rc = -EINVAL;
869
91774904 870 lock_kernel();
1da177e4
LT		 871 if (!sk || sk->sk_state != TCP_LISTEN)
872 goto out;
873
874 rc = -EOPNOTSUPP;
875 if (sk->sk_type != SOCK_SEQPACKET)
876 goto out;
877
878 lock_sock(sk);
879 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
880 if (rc)
881 goto out2;
882 skb = skb_dequeue(&sk->sk_receive_queue);
883 rc = -EINVAL;
884 if (!skb->sk)
885 goto out2;
886 newsk = skb->sk;
b61d38e0 887 sock_graft(newsk, newsock);
1da177e4
LT		 888
889 /* Now attach up the new socket */
890 skb->sk = NULL;
891 kfree_skb(skb);
892 sk->sk_ack_backlog--;
1da177e4
LT		 893 newsock->state = SS_CONNECTED;
894 rc = 0;
895out2:
896 release_sock(sk);
897out:
91774904 898 unlock_kernel();
1da177e4
LT		 899 return rc;
900}
901
902static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
903 int *uaddr_len, int peer)
904{
905 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
906 struct sock *sk = sock->sk;
907 struct x25_sock *x25 = x25_sk(sk);
91774904 908 int rc = 0;
1da177e4 909
91774904 910 lock_kernel();
1da177e4 911 if (peer) {
91774904
AB		 912 if (sk->sk_state != TCP_ESTABLISHED) {
913 rc = -ENOTCONN;
914 goto out;
915 }
1da177e4
LT		 916 sx25->sx25_addr = x25->dest_addr;
917 } else
918 sx25->sx25_addr = x25->source_addr;
919
920 sx25->sx25_family = AF_X25;
921 *uaddr_len = sizeof(*sx25);
922
91774904
AB		 923out:
924 unlock_kernel();
925 return rc;
926}
927
928static unsigned int x25_datagram_poll(struct file *file, struct socket *sock,
929 poll_table *wait)
930{
931 int rc;
932
933 lock_kernel();
934 rc = datagram_poll(file, sock, wait);
935 unlock_kernel();
936
937 return rc;
1da177e4 938}
f8e1d201 939
1da177e4
LT		 940int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
941 unsigned int lci)
942{
943 struct sock *sk;
944 struct sock *make;
945 struct x25_sock *makex25;
946 struct x25_address source_addr, dest_addr;
947 struct x25_facilities facilities;
a64b7b93 948 struct x25_dte_facilities dte_facilities;
95a9dc43 949 int len, addr_len, rc;
1da177e4
LT		 950
951 /*
952 * Remove the LCI and frame type.
953 */
954 skb_pull(skb, X25_STD_MIN_LEN);
955
956 /*
957 * Extract the X.25 addresses and convert them to ASCII strings,
958 * and remove them.
f5eb917b
JH		 959 *
960 * Address block is mandatory in call request packets
1da177e4 961 */
f5eb917b
JH		 962 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
963 if (addr_len <= 0)
964 goto out_clear_request;
95a9dc43 965 skb_pull(skb, addr_len);
1da177e4
LT		 966
967 /*
968 * Get the length of the facilities, skip past them for the moment
969 * get the call user data because this is needed to determine
970 * the correct listener
f5eb917b
JH		 971 *
972 * Facilities length is mandatory in call request packets
1da177e4 973 */
f5eb917b
JH		 974 if (skb->len < 1)
975 goto out_clear_request;
1da177e4 976 len = skb->data[0] + 1;
f5eb917b
JH		 977 if (skb->len < len)
978 goto out_clear_request;
1da177e4
LT		 979 skb_pull(skb,len);
980
1da177e4
LT		 981 /*
982 * Find a listener for the particular address/cud pair.
983 */
cb65d506
SP		 984 sk = x25_find_listener(&source_addr,skb);
985 skb_push(skb,len);
1da177e4 986
95a9dc43
AH		 987 if (sk != NULL && sk_acceptq_is_full(sk)) {
988 goto out_sock_put;
989 }
990
1da177e4 991 /*
95a9dc43
AH		 992 * We dont have any listeners for this incoming call.
993 * Try forwarding it.
1da177e4 994 */
95a9dc43
AH		 995 if (sk == NULL) {
996 skb_push(skb, addr_len + X25_STD_MIN_LEN);
39e21c0d
AH		 997 if (sysctl_x25_forward &&
998 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
95a9dc43
AH		 999 {
1000 /* Call was forwarded, dont process it any more */
1001 kfree_skb(skb);
1002 rc = 1;
1003 goto out;
1004 } else {
1005 /* No listeners, can't forward, clear the call */
1006 goto out_clear_request;
1007 }
1008 }
1da177e4
LT		 1009
1010 /*
1011 * Try to reach a compromise on the requested facilities.
1012 */
a64b7b93
SP		 1013 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1014 if (len == -1)
1da177e4
LT		 1015 goto out_sock_put;
1016
1017 /*
1018 * current neighbour/link might impose additional limits
1019 * on certain facilties
1020 */
1021
1022 x25_limit_facilities(&facilities, nb);
1023
1024 /*
1025 * Try to create a new socket.
1026 */
1027 make = x25_make_new(sk);
1028 if (!make)
1029 goto out_sock_put;
1030
1031 /*
1032 * Remove the facilities
1033 */
1034 skb_pull(skb, len);
1035
1036 skb->sk = make;
1037 make->sk_state = TCP_ESTABLISHED;
1038
1039 makex25 = x25_sk(make);
1040 makex25->lci = lci;
1041 makex25->dest_addr = dest_addr;
1042 makex25->source_addr = source_addr;
1043 makex25->neighbour = nb;
1044 makex25->facilities = facilities;
a64b7b93 1045 makex25->dte_facilities= dte_facilities;
1da177e4 1046 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
cb65d506
SP		 1047 /* ensure no reverse facil on accept */
1048 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
a64b7b93
SP		 1049 /* ensure no calling address extension on accept */
1050 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
cb65d506 1051 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1da177e4 1052
ebc3f64b
SP		 1053 /* Normally all calls are accepted immediatly */
1054 if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
1055 x25_write_internal(make, X25_CALL_ACCEPTED);
1056 makex25->state = X25_STATE_3;
1057 }
1da177e4 1058
cb65d506
SP		 1059 /*
1060 * Incoming Call User Data.
1061 */
8db09f26
RK		 1062 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1063 makex25->calluserdata.cudlength = skb->len;
cb65d506 1064
1da177e4
LT		 1065 sk->sk_ack_backlog++;
1066
1067 x25_insert_socket(make);
1068
1069 skb_queue_head(&sk->sk_receive_queue, skb);
1070
1071 x25_start_heartbeat(make);
1072
1073 if (!sock_flag(sk, SOCK_DEAD))
1074 sk->sk_data_ready(sk, skb->len);
1075 rc = 1;
1076 sock_put(sk);
1077out:
1078 return rc;
1079out_sock_put:
1080 sock_put(sk);
1081out_clear_request:
1082 rc = 0;
1083 x25_transmit_clear_request(nb, lci, 0x01);
1084 goto out;
1085}
1086
1087static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1088 struct msghdr *msg, size_t len)
1089{
1090 struct sock *sk = sock->sk;
1091 struct x25_sock *x25 = x25_sk(sk);
1092 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1093 struct sockaddr_x25 sx25;
1094 struct sk_buff *skb;
1095 unsigned char *asmptr;
1096 int noblock = msg->msg_flags & MSG_DONTWAIT;
1097 size_t size;
1098 int qbit = 0, rc = -EINVAL;
1099
91774904 1100 lock_kernel();
1da177e4
LT		 1101 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1102 goto out;
1103
1104 /* we currently don't support segmented records at the user interface */
1105 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1106 goto out;
1107
1108 rc = -EADDRNOTAVAIL;
1109 if (sock_flag(sk, SOCK_ZAPPED))
1110 goto out;
1111
1112 rc = -EPIPE;
1113 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1114 send_sig(SIGPIPE, current, 0);
1115 goto out;
1116 }
1117
1118 rc = -ENETUNREACH;
1119 if (!x25->neighbour)
1120 goto out;
1121
1122 if (usx25) {
1123 rc = -EINVAL;
1124 if (msg->msg_namelen < sizeof(sx25))
1125 goto out;
1126 memcpy(&sx25, usx25, sizeof(sx25));
1127 rc = -EISCONN;
1128 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1129 goto out;
1130 rc = -EINVAL;
1131 if (sx25.sx25_family != AF_X25)
1132 goto out;
1133 } else {
1134 /*
1135 * FIXME 1003.1g - if the socket is like this because
1136 * it has become closed (not started closed) we ought
1137 * to SIGPIPE, EPIPE;
1138 */
1139 rc = -ENOTCONN;
1140 if (sk->sk_state != TCP_ESTABLISHED)
1141 goto out;
1142
1143 sx25.sx25_family = AF_X25;
1144 sx25.sx25_addr = x25->dest_addr;
1145 }
1146
83e0bbcb
AC		 1147 /* Sanity check the packet size */
1148 if (len > 65535) {
1149 rc = -EMSGSIZE;
1150 goto out;
1151 }
1152
1da177e4
LT		 1153 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1154
1155 /* Build a packet */
1156 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1157
1158 if ((msg->msg_flags & MSG_OOB) && len > 32)
1159 len = 32;
1160
1161 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1162
1163 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1164 if (!skb)
1165 goto out;
1166 X25_SKB_CB(skb)->flags = msg->msg_flags;
1167
1168 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1169
1170 /*
1171 * Put the data on the end
1172 */
1173 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1174
eeeb0374
ACM		 1175 skb_reset_transport_header(skb);
1176 skb_put(skb, len);
1da177e4 1177
eeeb0374 1178 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1da177e4
LT		 1179 if (rc)
1180 goto out_kfree_skb;
1181
1182 /*
1183 * If the Q BIT Include socket option is in force, the first
1184 * byte of the user data is the logical value of the Q Bit.
1185 */
1186 if (x25->qbitincl) {
1187 qbit = skb->data[0];
1188 skb_pull(skb, 1);
1189 }
1190
1191 /*
1192 * Push down the X.25 header
1193 */
1194 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1195
1196 if (msg->msg_flags & MSG_OOB) {
1197 if (x25->neighbour->extended) {
1198 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1199 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1200 *asmptr++ = (x25->lci >> 0) & 0xFF;
1201 *asmptr++ = X25_INTERRUPT;
1202 } else {
1203 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1204 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1205 *asmptr++ = (x25->lci >> 0) & 0xFF;
1206 *asmptr++ = X25_INTERRUPT;
1207 }
1208 } else {
1209 if (x25->neighbour->extended) {
1210 /* Build an Extended X.25 header */
1211 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1212 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1213 *asmptr++ = (x25->lci >> 0) & 0xFF;
1214 *asmptr++ = X25_DATA;
1215 *asmptr++ = X25_DATA;
1216 } else {
1217 /* Build an Standard X.25 header */
1218 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1219 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1220 *asmptr++ = (x25->lci >> 0) & 0xFF;
1221 *asmptr++ = X25_DATA;
1222 }
1223
1224 if (qbit)
1225 skb->data[0] |= X25_Q_BIT;
1226 }
1227
1228 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1229 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1230
1231 rc = -ENOTCONN;
1232 if (sk->sk_state != TCP_ESTABLISHED)
1233 goto out_kfree_skb;
1234
1235 if (msg->msg_flags & MSG_OOB)
1236 skb_queue_tail(&x25->interrupt_out_queue, skb);
1237 else {
8db09f26
RK		 1238 rc = x25_output(sk, skb);
1239 len = rc;
1240 if (rc < 0)
1da177e4
LT		 1241 kfree_skb(skb);
1242 else if (x25->qbitincl)
1243 len++;
1244 }
1245
1246 /*
1247 * lock_sock() is currently only used to serialize this x25_kick()
1248 * against input-driven x25_kick() calls. It currently only blocks
1249 * incoming packets for this socket and does not protect against
1250 * any other socket state changes and is not called from anywhere
1251 * else. As x25_kick() cannot block and as long as all socket
1252 * operations are BKL-wrapped, we don't need take to care about
1253 * purging the backlog queue in x25_release().
1254 *
1255 * Using lock_sock() to protect all socket operations entirely
1256 * (and making the whole x25 stack SMP aware) unfortunately would
1257 * require major changes to {send,recv}msg and skb allocation methods.
1258 * -> 2.5 ;)
1259 */
1260 lock_sock(sk);
1261 x25_kick(sk);
1262 release_sock(sk);
1263 rc = len;
1264out:
91774904 1265 unlock_kernel();
1da177e4
LT		 1266 return rc;
1267out_kfree_skb:
1268 kfree_skb(skb);
1269 goto out;
1270}
1271
1272
1273static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1274 struct msghdr *msg, size_t size,
1275 int flags)
1276{
1277 struct sock *sk = sock->sk;
1278 struct x25_sock *x25 = x25_sk(sk);
1279 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1280 size_t copied;
1281 int qbit;
1282 struct sk_buff *skb;
1283 unsigned char *asmptr;
1284 int rc = -ENOTCONN;
1285
91774904 1286 lock_kernel();
1da177e4
LT		 1287 /*
1288 * This works for seqpacket too. The receiver has ordered the queue for
1289 * us! We do one quick check first though
1290 */
1291 if (sk->sk_state != TCP_ESTABLISHED)
1292 goto out;
1293
1294 if (flags & MSG_OOB) {
1295 rc = -EINVAL;
1296 if (sock_flag(sk, SOCK_URGINLINE) ||
1297 !skb_peek(&x25->interrupt_in_queue))
1298 goto out;
1299
1300 skb = skb_dequeue(&x25->interrupt_in_queue);
1301
1302 skb_pull(skb, X25_STD_MIN_LEN);
1303
1304 /*
1305 * No Q bit information on Interrupt data.
1306 */
1307 if (x25->qbitincl) {
1308 asmptr = skb_push(skb, 1);
1309 *asmptr = 0x00;
1310 }
1311
1312 msg->msg_flags |= MSG_OOB;
1313 } else {
1314 /* Now we can treat all alike */
1315 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1316 flags & MSG_DONTWAIT, &rc);
1317 if (!skb)
1318 goto out;
1319
1320 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1321
1322 skb_pull(skb, x25->neighbour->extended ?
1323 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1324
1325 if (x25->qbitincl) {
1326 asmptr = skb_push(skb, 1);
1327 *asmptr = qbit;
1328 }
1329 }
1330
badff6d0 1331 skb_reset_transport_header(skb);
1da177e4
LT		 1332 copied = skb->len;
1333
1334 if (copied > size) {
1335 copied = size;
1336 msg->msg_flags |= MSG_TRUNC;
1337 }
1338
f8e1d201 1339 /* Currently, each datagram always contains a complete record */
1da177e4
LT		 1340 msg->msg_flags |= MSG_EOR;
1341
1342 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1343 if (rc)
1344 goto out_free_dgram;
1345
1346 if (sx25) {
1347 sx25->sx25_family = AF_X25;
1348 sx25->sx25_addr = x25->dest_addr;
1349 }
1350
1351 msg->msg_namelen = sizeof(struct sockaddr_x25);
1352
1353 lock_sock(sk);
1354 x25_check_rbuf(sk);
1355 release_sock(sk);
1356 rc = copied;
1357out_free_dgram:
1358 skb_free_datagram(sk, skb);
1359out:
91774904 1360 unlock_kernel();
1da177e4
LT		 1361 return rc;
1362}
1363
1364
1365static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1366{
1367 struct sock *sk = sock->sk;
1368 struct x25_sock *x25 = x25_sk(sk);
1369 void __user *argp = (void __user *)arg;
1370 int rc;
1371
91774904 1372 lock_kernel();
1da177e4
LT		 1373 switch (cmd) {
1374 case TIOCOUTQ: {
31e6d363
ED		 1375 int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1376
1da177e4
LT		 1377 if (amount < 0)
1378 amount = 0;
1379 rc = put_user(amount, (unsigned int __user *)argp);
1380 break;
1381 }
1382
1383 case TIOCINQ: {
1384 struct sk_buff *skb;
1385 int amount = 0;
1386 /*
1387 * These two are safe on a single CPU system as
1388 * only user tasks fiddle here
1389 */
1390 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1391 amount = skb->len;
1392 rc = put_user(amount, (unsigned int __user *)argp);
1393 break;
1394 }
1395
1396 case SIOCGSTAMP:
1397 rc = -EINVAL;
1398 if (sk)
f8e1d201
YH		 1399 rc = sock_get_timestamp(sk,
1400 (struct timeval __user *)argp);
1da177e4 1401 break;
ae40eb1e
ED		 1402 case SIOCGSTAMPNS:
1403 rc = -EINVAL;
1404 if (sk)
1405 rc = sock_get_timestampns(sk,
1406 (struct timespec __user *)argp);
1407 break;
1da177e4
LT		 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 struct x25_facilities fac = x25->facilities;
1438 rc = copy_to_user(argp, &fac,
1439 sizeof(fac)) ? -EFAULT : 0;
1440 break;
1441 }
1442
1443 case SIOCX25SFACILITIES: {
1444 struct x25_facilities facilities;
1445 rc = -EFAULT;
1446 if (copy_from_user(&facilities, argp,
1447 sizeof(facilities)))
1448 break;
1449 rc = -EINVAL;
1450 if (sk->sk_state != TCP_LISTEN &&
1451 sk->sk_state != TCP_CLOSE)
1452 break;
1453 if (facilities.pacsize_in < X25_PS16 ||
1454 facilities.pacsize_in > X25_PS4096)
1455 break;
1456 if (facilities.pacsize_out < X25_PS16 ||
1457 facilities.pacsize_out > X25_PS4096)
1458 break;
1459 if (facilities.winsize_in < 1 ||
1460 facilities.winsize_in > 127)
1461 break;
1462 if (facilities.throughput < 0x03 ||
1463 facilities.throughput > 0xDD)
1464 break;
ebc3f64b 1465 if (facilities.reverse &&
06a96b33 1466 (facilities.reverse & 0x81) != 0x81)
1da177e4
LT		 1467 break;
1468 x25->facilities = facilities;
1469 rc = 0;
1470 break;
1471 }
1472
a64b7b93 1473 case SIOCX25GDTEFACILITIES: {
f8e1d201 1474 rc = copy_to_user(argp, &x25->dte_facilities,
a64b7b93
SP		 1475 sizeof(x25->dte_facilities));
1476 if (rc)
1477 rc = -EFAULT;
f8e1d201
YH		 1478 break;
1479 }
a64b7b93 1480
f8e1d201
YH		 1481 case SIOCX25SDTEFACILITIES: {
1482 struct x25_dte_facilities dtefacs;
1483 rc = -EFAULT;
1484 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
a64b7b93
SP		 1485 break;
1486 rc = -EINVAL;
1487 if (sk->sk_state != TCP_LISTEN &&
1488 sk->sk_state != TCP_CLOSE)
1489 break;
1490 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1491 break;
1492 if (dtefacs.calling_ae == NULL)
1493 break;
1494 if (dtefacs.called_len > X25_MAX_AE_LEN)
1495 break;
1496 if (dtefacs.called_ae == NULL)
1497 break;
1498 x25->dte_facilities = dtefacs;
1499 rc = 0;
1500 break;
1501 }
1502
1da177e4
LT		 1503 case SIOCX25GCALLUSERDATA: {
1504 struct x25_calluserdata cud = x25->calluserdata;
1505 rc = copy_to_user(argp, &cud,
1506 sizeof(cud)) ? -EFAULT : 0;
1507 break;
1508 }
1509
1510 case SIOCX25SCALLUSERDATA: {
1511 struct x25_calluserdata calluserdata;
1512
1513 rc = -EFAULT;
1514 if (copy_from_user(&calluserdata, argp,
1515 sizeof(calluserdata)))
1516 break;
1517 rc = -EINVAL;
1518 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1519 break;
1520 x25->calluserdata = calluserdata;
1521 rc = 0;
1522 break;
1523 }
1524
1525 case SIOCX25GCAUSEDIAG: {
1526 struct x25_causediag causediag;
1527 causediag = x25->causediag;
1528 rc = copy_to_user(argp, &causediag,
1529 sizeof(causediag)) ? -EFAULT : 0;
1530 break;
1531 }
1532
386e50cc
AH		 1533 case SIOCX25SCAUSEDIAG: {
1534 struct x25_causediag causediag;
1535 rc = -EFAULT;
1536 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1537 break;
1538 x25->causediag = causediag;
1539 rc = 0;
1540 break;
1541
1542 }
1543
cb65d506
SP		 1544 case SIOCX25SCUDMATCHLEN: {
1545 struct x25_subaddr sub_addr;
1546 rc = -EINVAL;
1547 if(sk->sk_state != TCP_CLOSE)
1548 break;
1549 rc = -EFAULT;
1550 if (copy_from_user(&sub_addr, argp,
1551 sizeof(sub_addr)))
1552 break;
f8e1d201 1553 rc = -EINVAL;
cb65d506
SP		 1554 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1555 break;
1556 x25->cudmatchlength = sub_addr.cudmatchlength;
1557 rc = 0;
1558 break;
1559 }
1560
ebc3f64b
SP		 1561 case SIOCX25CALLACCPTAPPRV: {
1562 rc = -EINVAL;
1563 if (sk->sk_state != TCP_CLOSE)
1564 break;
1565 x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1566 rc = 0;
1567 break;
1568 }
1569
1570 case SIOCX25SENDCALLACCPT: {
1571 rc = -EINVAL;
1572 if (sk->sk_state != TCP_ESTABLISHED)
1573 break;
1574 if (x25->accptapprv) /* must call accptapprv above */
1575 break;
1576 x25_write_internal(sk, X25_CALL_ACCEPTED);
1577 x25->state = X25_STATE_3;
1578 rc = 0;
1579 break;
1580 }
1581
f8e1d201 1582 default:
b5e5fa5e 1583 rc = -ENOIOCTLCMD;
1da177e4
LT		 1584 break;
1585 }
91774904 1586 unlock_kernel();
1da177e4
LT		 1587
1588 return rc;
1589}
1590
ec1b4cf7 1591static const struct net_proto_family x25_family_ops = {
1da177e4
LT		 1592 .family = AF_X25,
1593 .create = x25_create,
1594 .owner = THIS_MODULE,
1595};
1596
1b06e6ba
SP		 1597#ifdef CONFIG_COMPAT
1598static int compat_x25_subscr_ioctl(unsigned int cmd,
1599 struct compat_x25_subscrip_struct __user *x25_subscr32)
1600{
1601 struct compat_x25_subscrip_struct x25_subscr;
1602 struct x25_neigh *nb;
1603 struct net_device *dev;
1604 int rc = -EINVAL;
1605
1606 rc = -EFAULT;
1607 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1608 goto out;
1609
1610 rc = -EINVAL;
1611 dev = x25_dev_get(x25_subscr.device);
1612 if (dev == NULL)
1613 goto out;
1614
1615 nb = x25_get_neigh(dev);
1616 if (nb == NULL)
1617 goto out_dev_put;
1618
1619 dev_put(dev);
1620
1621 if (cmd == SIOCX25GSUBSCRIP) {
1622 x25_subscr.extended = nb->extended;
1623 x25_subscr.global_facil_mask = nb->global_facil_mask;
1624 rc = copy_to_user(x25_subscr32, &x25_subscr,
1625 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1626 } else {
1627 rc = -EINVAL;
1628 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1629 rc = 0;
1630 nb->extended = x25_subscr.extended;
1631 nb->global_facil_mask = x25_subscr.global_facil_mask;
1632 }
1633 }
1634 x25_neigh_put(nb);
1635out:
1636 return rc;
1637out_dev_put:
1638 dev_put(dev);
1639 goto out;
1640}
1641
1642static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1643 unsigned long arg)
1644{
1645 void __user *argp = compat_ptr(arg);
1646 struct sock *sk = sock->sk;
1647
1648 int rc = -ENOIOCTLCMD;
1649
1650 switch(cmd) {
1651 case TIOCOUTQ:
1652 case TIOCINQ:
1653 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1654 break;
1655 case SIOCGSTAMP:
1656 rc = -EINVAL;
91774904 1657 lock_kernel();
1b06e6ba
SP		 1658 if (sk)
1659 rc = compat_sock_get_timestamp(sk,
1660 (struct timeval __user*)argp);
91774904 1661 unlock_kernel();
1b06e6ba 1662 break;
ae40eb1e
ED		 1663 case SIOCGSTAMPNS:
1664 rc = -EINVAL;
91774904 1665 lock_kernel();
ae40eb1e
ED		 1666 if (sk)
1667 rc = compat_sock_get_timestampns(sk,
1668 (struct timespec __user*)argp);
91774904 1669 unlock_kernel();
ae40eb1e 1670 break;
1b06e6ba
SP		 1671 case SIOCGIFADDR:
1672 case SIOCSIFADDR:
1673 case SIOCGIFDSTADDR:
1674 case SIOCSIFDSTADDR:
1675 case SIOCGIFBRDADDR:
1676 case SIOCSIFBRDADDR:
1677 case SIOCGIFNETMASK:
1678 case SIOCSIFNETMASK:
1679 case SIOCGIFMETRIC:
1680 case SIOCSIFMETRIC:
1681 rc = -EINVAL;
1682 break;
1683 case SIOCADDRT:
1684 case SIOCDELRT:
1685 rc = -EPERM;
1686 if (!capable(CAP_NET_ADMIN))
1687 break;
91774904 1688 lock_kernel();
1b06e6ba 1689 rc = x25_route_ioctl(cmd, argp);
91774904 1690 unlock_kernel();
1b06e6ba
SP		 1691 break;
1692 case SIOCX25GSUBSCRIP:
91774904 1693 lock_kernel();
1b06e6ba 1694 rc = compat_x25_subscr_ioctl(cmd, argp);
91774904 1695 unlock_kernel();
1b06e6ba
SP		 1696 break;
1697 case SIOCX25SSUBSCRIP:
1698 rc = -EPERM;
1699 if (!capable(CAP_NET_ADMIN))
1700 break;
91774904 1701 lock_kernel();
1b06e6ba 1702 rc = compat_x25_subscr_ioctl(cmd, argp);
91774904 1703 unlock_kernel();
1b06e6ba
SP		 1704 break;
1705 case SIOCX25GFACILITIES:
1706 case SIOCX25SFACILITIES:
9a6b9f2e
SP		 1707 case SIOCX25GDTEFACILITIES:
1708 case SIOCX25SDTEFACILITIES:
1b06e6ba
SP		 1709 case SIOCX25GCALLUSERDATA:
1710 case SIOCX25SCALLUSERDATA:
1711 case SIOCX25GCAUSEDIAG:
386e50cc 1712 case SIOCX25SCAUSEDIAG:
1b06e6ba
SP		 1713 case SIOCX25SCUDMATCHLEN:
1714 case SIOCX25CALLACCPTAPPRV:
1715 case SIOCX25SENDCALLACCPT:
1716 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1717 break;
1718 default:
1719 rc = -ENOIOCTLCMD;
1720 break;
1721 }
1722 return rc;
1723}
1724#endif
1725
91774904 1726static const struct proto_ops x25_proto_ops = {
1da177e4
LT		 1727 .family = AF_X25,
1728 .owner = THIS_MODULE,
1729 .release = x25_release,
1730 .bind = x25_bind,
1731 .connect = x25_connect,
1732 .socketpair = sock_no_socketpair,
1733 .accept = x25_accept,
1734 .getname = x25_getname,
91774904 1735 .poll = x25_datagram_poll,
1da177e4 1736 .ioctl = x25_ioctl,
1b06e6ba
SP		 1737#ifdef CONFIG_COMPAT
1738 .compat_ioctl = compat_x25_ioctl,
1739#endif
1da177e4
LT		 1740 .listen = x25_listen,
1741 .shutdown = sock_no_shutdown,
1742 .setsockopt = x25_setsockopt,
1743 .getsockopt = x25_getsockopt,
1744 .sendmsg = x25_sendmsg,
1745 .recvmsg = x25_recvmsg,
1746 .mmap = sock_no_mmap,
1747 .sendpage = sock_no_sendpage,
1748};
1749
7546dd97 1750static struct packet_type x25_packet_type __read_mostly = {
09640e63 1751 .type = cpu_to_be16(ETH_P_X25),
1da177e4
LT		 1752 .func = x25_lapb_receive_frame,
1753};
1754
1755static struct notifier_block x25_dev_notifier = {
1756 .notifier_call = x25_device_event,
1757};
1758
1759void x25_kill_by_neigh(struct x25_neigh *nb)
1760{
1761 struct sock *s;
1762 struct hlist_node *node;
1763
1764 write_lock_bh(&x25_list_lock);
1765
1766 sk_for_each(s, node, &x25_list)
1767 if (x25_sk(s)->neighbour == nb)
1768 x25_disconnect(s, ENETUNREACH, 0, 0);
1769
1770 write_unlock_bh(&x25_list_lock);
95a9dc43
AH		 1771
1772 /* Remove any related forwards */
1773 x25_clear_forward_by_dev(nb->dev);
1da177e4
LT		 1774}
1775
1776static int __init x25_init(void)
1777{
1778 int rc = proto_register(&x25_proto, 0);
1779
1780 if (rc != 0)
1781 goto out;
1782
1fd975a0 1783 rc = sock_register(&x25_family_ops);
1784 if (rc != 0)
1785 goto out_proto;
1da177e4
LT		 1786
1787 dev_add_pack(&x25_packet_type);
1788
1fd975a0 1789 rc = register_netdevice_notifier(&x25_dev_notifier);
1790 if (rc != 0)
1791 goto out_sock;
1da177e4 1792
a44562e4 1793 printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1da177e4 1794
1da177e4 1795 x25_register_sysctl();
1fd975a0 1796 rc = x25_proc_init();
1797 if (rc != 0)
1798 goto out_dev;
1da177e4
LT		 1799out:
1800 return rc;
1fd975a0 1801out_dev:
1802 unregister_netdevice_notifier(&x25_dev_notifier);
1803out_sock:
1804 sock_unregister(AF_X25);
1805out_proto:
1806 proto_unregister(&x25_proto);
1807 goto out;
1da177e4
LT		 1808}
1809module_init(x25_init);
1810
1811static void __exit x25_exit(void)
1812{
1813 x25_proc_exit();
1814 x25_link_free();
1815 x25_route_free();
1816
1da177e4 1817 x25_unregister_sysctl();
1da177e4
LT		 1818
1819 unregister_netdevice_notifier(&x25_dev_notifier);
1820
1821 dev_remove_pack(&x25_packet_type);
1822
1823 sock_unregister(AF_X25);
1824 proto_unregister(&x25_proto);
1825}
1826module_exit(x25_exit);
1827
1828MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1829MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1830MODULE_LICENSE("GPL");
1831MODULE_ALIAS_NETPROTO(PF_X25);
Clone of davem's net-next-2.6 tree