projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
x25: Validate incoming call user data lengths
[linux-2.6-block.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>
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>
5a0e3ad6 49#include <linux/slab.h>
1da177e4 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) {
fddc5f3e
JP		 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;
1da177e4
LT		 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 */
2cec6b01 404 skb->sk->sk_state = TCP_LISTEN;
1da177e4
LT		 405 sock_set_flag(skb->sk, SOCK_DEAD);
406 x25_start_heartbeat(skb->sk);
407 x25_sk(skb->sk)->state = X25_STATE_0;
408 }
409
410 kfree_skb(skb);
411 }
412
c564039f 413 if (sk_has_allocations(sk)) {
1da177e4
LT		 414 /* Defer: outstanding buffers */
415 sk->sk_timer.expires = jiffies + 10 * HZ;
416 sk->sk_timer.function = x25_destroy_timer;
417 sk->sk_timer.data = (unsigned long)sk;
418 add_timer(&sk->sk_timer);
419 } else {
420 /* drop last reference so sock_put will free */
421 __sock_put(sk);
422 }
14ebaf81 423}
1da177e4 424
14ebaf81
DM		 425void x25_destroy_socket_from_timer(struct sock *sk)
426{
427 sock_hold(sk);
428 bh_lock_sock(sk);
429 __x25_destroy_socket(sk);
430 bh_unlock_sock(sk);
431 sock_put(sk);
432}
433
1da177e4
LT		 434/*
435 * Handling for system calls applied via the various interfaces to a
436 * X.25 socket object.
437 */
438
439static int x25_setsockopt(struct socket *sock, int level, int optname,
b7058842 440 char __user *optval, unsigned int optlen)
1da177e4
LT		 441{
442 int opt;
443 struct sock *sk = sock->sk;
444 int rc = -ENOPROTOOPT;
445
446 if (level != SOL_X25 || optname != X25_QBITINCL)
447 goto out;
448
449 rc = -EINVAL;
450 if (optlen < sizeof(int))
451 goto out;
452
453 rc = -EFAULT;
454 if (get_user(opt, (int __user *)optval))
455 goto out;
456
cb863ffd 457 if (opt)
458 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
459 else
460 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
1da177e4
LT		 461 rc = 0;
462out:
463 return rc;
464}
465
466static int x25_getsockopt(struct socket *sock, int level, int optname,
467 char __user *optval, int __user *optlen)
468{
469 struct sock *sk = sock->sk;
470 int val, len, rc = -ENOPROTOOPT;
f8e1d201 471
1da177e4
LT		 472 if (level != SOL_X25 || optname != X25_QBITINCL)
473 goto out;
474
475 rc = -EFAULT;
476 if (get_user(len, optlen))
477 goto out;
478
479 len = min_t(unsigned int, len, sizeof(int));
480
481 rc = -EINVAL;
482 if (len < 0)
483 goto out;
f8e1d201 484
1da177e4
LT		 485 rc = -EFAULT;
486 if (put_user(len, optlen))
487 goto out;
488
cb863ffd 489 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
1da177e4
LT		 490 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
491out:
492 return rc;
493}
494
495static int x25_listen(struct socket *sock, int backlog)
496{
497 struct sock *sk = sock->sk;
498 int rc = -EOPNOTSUPP;
499
25aa4efe 500 lock_sock(sk);
1da177e4
LT		 501 if (sk->sk_state != TCP_LISTEN) {
502 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
503 sk->sk_max_ack_backlog = backlog;
504 sk->sk_state = TCP_LISTEN;
505 rc = 0;
506 }
25aa4efe 507 release_sock(sk);
1da177e4
LT		 508
509 return rc;
510}
511
512static struct proto x25_proto = {
513 .name = "X25",
514 .owner = THIS_MODULE,
515 .obj_size = sizeof(struct x25_sock),
516};
517
1b8d7ae4 518static struct sock *x25_alloc_socket(struct net *net)
1da177e4
LT		 519{
520 struct x25_sock *x25;
6257ff21 521 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
1da177e4
LT		 522
523 if (!sk)
524 goto out;
525
526 sock_init_data(NULL, sk);
527
528 x25 = x25_sk(sk);
529 skb_queue_head_init(&x25->ack_queue);
530 skb_queue_head_init(&x25->fragment_queue);
531 skb_queue_head_init(&x25->interrupt_in_queue);
532 skb_queue_head_init(&x25->interrupt_out_queue);
533out:
534 return sk;
535}
536
3f378b68
EP		 537static int x25_create(struct net *net, struct socket *sock, int protocol,
538 int kern)
1da177e4
LT		 539{
540 struct sock *sk;
541 struct x25_sock *x25;
b18e7a06 542 int rc = -EAFNOSUPPORT;
1da177e4 543
09ad9bc7 544 if (!net_eq(net, &init_net))
b18e7a06 545 goto out;
546
547 rc = -ESOCKTNOSUPPORT;
548 if (sock->type != SOCK_SEQPACKET)
549 goto out;
1b8d7ae4 550
b18e7a06 551 rc = -EINVAL;
552 if (protocol)
1da177e4
LT		 553 goto out;
554
b18e7a06 555 rc = -ENOBUFS;
1b8d7ae4 556 if ((sk = x25_alloc_socket(net)) == NULL)
1da177e4
LT		 557 goto out;
558
559 x25 = x25_sk(sk);
560
561 sock_init_data(sock, sk);
562
563 x25_init_timers(sk);
564
565 sock->ops = &x25_proto_ops;
566 sk->sk_protocol = protocol;
567 sk->sk_backlog_rcv = x25_backlog_rcv;
568
569 x25->t21 = sysctl_x25_call_request_timeout;
570 x25->t22 = sysctl_x25_reset_request_timeout;
571 x25->t23 = sysctl_x25_clear_request_timeout;
572 x25->t2 = sysctl_x25_ack_holdback_timeout;
573 x25->state = X25_STATE_0;
cb65d506 574 x25->cudmatchlength = 0;
37cda787 575 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
ebc3f64b 576 /* on call accept */
1da177e4
LT		 577
578 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
579 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
580 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
581 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
ddd0451f
JH		 582 x25->facilities.throughput = 0; /* by default don't negotiate
583 throughput */
1da177e4 584 x25->facilities.reverse = X25_DEFAULT_REVERSE;
f8e1d201
YH		 585 x25->dte_facilities.calling_len = 0;
586 x25->dte_facilities.called_len = 0;
587 memset(x25->dte_facilities.called_ae, '\0',
588 sizeof(x25->dte_facilities.called_ae));
589 memset(x25->dte_facilities.calling_ae, '\0',
590 sizeof(x25->dte_facilities.calling_ae));
a64b7b93 591
1da177e4
LT		 592 rc = 0;
593out:
594 return rc;
595}
596
597static struct sock *x25_make_new(struct sock *osk)
598{
599 struct sock *sk = NULL;
600 struct x25_sock *x25, *ox25;
601
602 if (osk->sk_type != SOCK_SEQPACKET)
603 goto out;
604
3b1e0a65 605 if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
1da177e4
LT		 606 goto out;
607
608 x25 = x25_sk(sk);
609
610 sk->sk_type = osk->sk_type;
1da177e4
LT		 611 sk->sk_priority = osk->sk_priority;
612 sk->sk_protocol = osk->sk_protocol;
613 sk->sk_rcvbuf = osk->sk_rcvbuf;
614 sk->sk_sndbuf = osk->sk_sndbuf;
615 sk->sk_state = TCP_ESTABLISHED;
1da177e4 616 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
a20a8554 617 sock_copy_flags(sk, osk);
1da177e4
LT		 618
619 ox25 = x25_sk(osk);
620 x25->t21 = ox25->t21;
621 x25->t22 = ox25->t22;
622 x25->t23 = ox25->t23;
623 x25->t2 = ox25->t2;
cb863ffd 624 x25->flags = ox25->flags;
1da177e4 625 x25->facilities = ox25->facilities;
a64b7b93 626 x25->dte_facilities = ox25->dte_facilities;
cb65d506 627 x25->cudmatchlength = ox25->cudmatchlength;
1da177e4 628
b7792e34 629 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
1da177e4
LT		 630 x25_init_timers(sk);
631out:
632 return sk;
633}
634
635static int x25_release(struct socket *sock)
636{
637 struct sock *sk = sock->sk;
638 struct x25_sock *x25;
639
640 if (!sk)
77b22836 641 return 0;
1da177e4
LT		 642
643 x25 = x25_sk(sk);
644
77b22836
AB		 645 sock_hold(sk);
646 lock_sock(sk);
1da177e4
LT		 647 switch (x25->state) {
648
649 case X25_STATE_0:
650 case X25_STATE_2:
651 x25_disconnect(sk, 0, 0, 0);
77b22836 652 __x25_destroy_socket(sk);
1da177e4
LT		 653 goto out;
654
655 case X25_STATE_1:
656 case X25_STATE_3:
657 case X25_STATE_4:
658 x25_clear_queues(sk);
659 x25_write_internal(sk, X25_CLEAR_REQUEST);
660 x25_start_t23timer(sk);
661 x25->state = X25_STATE_2;
662 sk->sk_state = TCP_CLOSE;
663 sk->sk_shutdown |= SEND_SHUTDOWN;
664 sk->sk_state_change(sk);
665 sock_set_flag(sk, SOCK_DEAD);
666 sock_set_flag(sk, SOCK_DESTROY);
667 break;
668 }
669
c751e4f8 670 sock_orphan(sk);
1da177e4 671out:
77b22836
AB		 672 release_sock(sk);
673 sock_put(sk);
1da177e4
LT		 674 return 0;
675}
676
677static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
678{
679 struct sock *sk = sock->sk;
680 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
a9288525 681 int len, i, rc = 0;
1da177e4
LT		 682
683 if (!sock_flag(sk, SOCK_ZAPPED) ||
684 addr_len != sizeof(struct sockaddr_x25) ||
91774904
AB		 685 addr->sx25_family != AF_X25) {
686 rc = -EINVAL;
687 goto out;
688 }
1da177e4 689
a9288525 690 len = strlen(addr->sx25_addr.x25_addr);
691 for (i = 0; i < len; i++) {
692 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
693 rc = -EINVAL;
694 goto out;
695 }
696 }
697
90c27297 698 lock_sock(sk);
1da177e4
LT		 699 x25_sk(sk)->source_addr = addr->sx25_addr;
700 x25_insert_socket(sk);
701 sock_reset_flag(sk, SOCK_ZAPPED);
90c27297 702 release_sock(sk);
1da177e4 703 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
91774904 704out:
91774904 705 return rc;
1da177e4
LT		 706}
707
708static int x25_wait_for_connection_establishment(struct sock *sk)
709{
710 DECLARE_WAITQUEUE(wait, current);
f8e1d201 711 int rc;
1da177e4 712
aa395145 713 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 714 for (;;) {
715 __set_current_state(TASK_INTERRUPTIBLE);
716 rc = -ERESTARTSYS;
717 if (signal_pending(current))
718 break;
719 rc = sock_error(sk);
720 if (rc) {
721 sk->sk_socket->state = SS_UNCONNECTED;
722 break;
723 }
724 rc = 0;
725 if (sk->sk_state != TCP_ESTABLISHED) {
726 release_sock(sk);
727 schedule();
728 lock_sock(sk);
729 } else
730 break;
731 }
732 __set_current_state(TASK_RUNNING);
aa395145 733 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 734 return rc;
735}
736
737static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
738 int addr_len, int flags)
739{
740 struct sock *sk = sock->sk;
741 struct x25_sock *x25 = x25_sk(sk);
742 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
743 struct x25_route *rt;
744 int rc = 0;
745
746 lock_sock(sk);
747 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
748 sock->state = SS_CONNECTED;
749 goto out; /* Connect completed during a ERESTARTSYS event */
750 }
751
752 rc = -ECONNREFUSED;
753 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
754 sock->state = SS_UNCONNECTED;
755 goto out;
756 }
757
758 rc = -EISCONN; /* No reconnect on a seqpacket socket */
759 if (sk->sk_state == TCP_ESTABLISHED)
760 goto out;
761
f8e1d201 762 sk->sk_state = TCP_CLOSE;
1da177e4
LT		 763 sock->state = SS_UNCONNECTED;
764
765 rc = -EINVAL;
766 if (addr_len != sizeof(struct sockaddr_x25) ||
767 addr->sx25_family != AF_X25)
768 goto out;
769
770 rc = -ENETUNREACH;
771 rt = x25_get_route(&addr->sx25_addr);
772 if (!rt)
773 goto out;
774
775 x25->neighbour = x25_get_neigh(rt->dev);
776 if (!x25->neighbour)
777 goto out_put_route;
778
779 x25_limit_facilities(&x25->facilities, x25->neighbour);
780
781 x25->lci = x25_new_lci(x25->neighbour);
782 if (!x25->lci)
783 goto out_put_neigh;
784
785 rc = -EINVAL;
786 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
787 goto out_put_neigh;
788
789 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
790 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
791
792 x25->dest_addr = addr->sx25_addr;
793
794 /* Move to connecting socket, start sending Connect Requests */
795 sock->state = SS_CONNECTING;
796 sk->sk_state = TCP_SYN_SENT;
797
798 x25->state = X25_STATE_1;
799
800 x25_write_internal(sk, X25_CALL_REQUEST);
801
802 x25_start_heartbeat(sk);
803 x25_start_t21timer(sk);
804
805 /* Now the loop */
806 rc = -EINPROGRESS;
807 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
808 goto out_put_neigh;
809
810 rc = x25_wait_for_connection_establishment(sk);
811 if (rc)
812 goto out_put_neigh;
813
814 sock->state = SS_CONNECTED;
815 rc = 0;
816out_put_neigh:
817 if (rc)
818 x25_neigh_put(x25->neighbour);
819out_put_route:
820 x25_route_put(rt);
821out:
822 release_sock(sk);
823 return rc;
824}
825
bac37ec8 826static int x25_wait_for_data(struct sock *sk, long timeout)
1da177e4
LT		 827{
828 DECLARE_WAITQUEUE(wait, current);
829 int rc = 0;
830
aa395145 831 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 832 for (;;) {
833 __set_current_state(TASK_INTERRUPTIBLE);
834 if (sk->sk_shutdown & RCV_SHUTDOWN)
835 break;
836 rc = -ERESTARTSYS;
837 if (signal_pending(current))
838 break;
839 rc = -EAGAIN;
840 if (!timeout)
841 break;
842 rc = 0;
843 if (skb_queue_empty(&sk->sk_receive_queue)) {
844 release_sock(sk);
845 timeout = schedule_timeout(timeout);
846 lock_sock(sk);
847 } else
848 break;
849 }
850 __set_current_state(TASK_RUNNING);
aa395145 851 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 852 return rc;
853}
f8e1d201 854
1da177e4
LT		 855static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
856{
857 struct sock *sk = sock->sk;
858 struct sock *newsk;
859 struct sk_buff *skb;
860 int rc = -EINVAL;
861
141646ce 862 if (!sk)
1da177e4
LT		 863 goto out;
864
865 rc = -EOPNOTSUPP;
866 if (sk->sk_type != SOCK_SEQPACKET)
867 goto out;
868
869 lock_sock(sk);
141646ce
AH		 870 rc = -EINVAL;
871 if (sk->sk_state != TCP_LISTEN)
872 goto out2;
873
1da177e4
LT		 874 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
875 if (rc)
876 goto out2;
877 skb = skb_dequeue(&sk->sk_receive_queue);
878 rc = -EINVAL;
879 if (!skb->sk)
880 goto out2;
881 newsk = skb->sk;
b61d38e0 882 sock_graft(newsk, newsock);
1da177e4
LT		 883
884 /* Now attach up the new socket */
885 skb->sk = NULL;
886 kfree_skb(skb);
887 sk->sk_ack_backlog--;
1da177e4
LT		 888 newsock->state = SS_CONNECTED;
889 rc = 0;
890out2:
891 release_sock(sk);
892out:
893 return rc;
894}
895
896static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
897 int *uaddr_len, int peer)
898{
899 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
900 struct sock *sk = sock->sk;
901 struct x25_sock *x25 = x25_sk(sk);
91774904 902 int rc = 0;
1da177e4
LT		 903
904 if (peer) {
91774904
AB		 905 if (sk->sk_state != TCP_ESTABLISHED) {
906 rc = -ENOTCONN;
907 goto out;
908 }
1da177e4
LT		 909 sx25->sx25_addr = x25->dest_addr;
910 } else
911 sx25->sx25_addr = x25->source_addr;
912
913 sx25->sx25_family = AF_X25;
914 *uaddr_len = sizeof(*sx25);
915
91774904 916out:
91774904
AB		 917 return rc;
918}
919
1da177e4
LT		 920int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
921 unsigned int lci)
922{
923 struct sock *sk;
924 struct sock *make;
925 struct x25_sock *makex25;
926 struct x25_address source_addr, dest_addr;
927 struct x25_facilities facilities;
a64b7b93 928 struct x25_dte_facilities dte_facilities;
95a9dc43 929 int len, addr_len, rc;
1da177e4
LT		 930
931 /*
932 * Remove the LCI and frame type.
933 */
934 skb_pull(skb, X25_STD_MIN_LEN);
935
936 /*
937 * Extract the X.25 addresses and convert them to ASCII strings,
938 * and remove them.
f5eb917b
JH		 939 *
940 * Address block is mandatory in call request packets
1da177e4 941 */
f5eb917b
JH		 942 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
943 if (addr_len <= 0)
944 goto out_clear_request;
95a9dc43 945 skb_pull(skb, addr_len);
1da177e4
LT		 946
947 /*
948 * Get the length of the facilities, skip past them for the moment
949 * get the call user data because this is needed to determine
950 * the correct listener
f5eb917b
JH		 951 *
952 * Facilities length is mandatory in call request packets
1da177e4 953 */
f5eb917b
JH		 954 if (skb->len < 1)
955 goto out_clear_request;
1da177e4 956 len = skb->data[0] + 1;
f5eb917b
JH		 957 if (skb->len < len)
958 goto out_clear_request;
1da177e4
LT		 959 skb_pull(skb,len);
960
c7fd0d48
MD		 961 /*
962 * Ensure that the amount of call user data is valid.
963 */
964 if (skb->len > X25_MAX_CUD_LEN)
965 goto out_clear_request;
966
1da177e4
LT		 967 /*
968 * Find a listener for the particular address/cud pair.
969 */
cb65d506
SP		 970 sk = x25_find_listener(&source_addr,skb);
971 skb_push(skb,len);
1da177e4 972
95a9dc43
AH		 973 if (sk != NULL && sk_acceptq_is_full(sk)) {
974 goto out_sock_put;
975 }
976
1da177e4 977 /*
95a9dc43
AH		 978 * We dont have any listeners for this incoming call.
979 * Try forwarding it.
1da177e4 980 */
95a9dc43
AH		 981 if (sk == NULL) {
982 skb_push(skb, addr_len + X25_STD_MIN_LEN);
39e21c0d
AH		 983 if (sysctl_x25_forward &&
984 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
95a9dc43
AH		 985 {
986 /* Call was forwarded, dont process it any more */
987 kfree_skb(skb);
988 rc = 1;
989 goto out;
990 } else {
991 /* No listeners, can't forward, clear the call */
992 goto out_clear_request;
993 }
994 }
1da177e4
LT		 995
996 /*
997 * Try to reach a compromise on the requested facilities.
998 */
a64b7b93
SP		 999 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1000 if (len == -1)
1da177e4
LT		 1001 goto out_sock_put;
1002
1003 /*
1004 * current neighbour/link might impose additional limits
1005 * on certain facilties
1006 */
1007
1008 x25_limit_facilities(&facilities, nb);
1009
1010 /*
1011 * Try to create a new socket.
1012 */
1013 make = x25_make_new(sk);
1014 if (!make)
1015 goto out_sock_put;
1016
1017 /*
1018 * Remove the facilities
1019 */
1020 skb_pull(skb, len);
1021
1022 skb->sk = make;
1023 make->sk_state = TCP_ESTABLISHED;
1024
1025 makex25 = x25_sk(make);
1026 makex25->lci = lci;
1027 makex25->dest_addr = dest_addr;
1028 makex25->source_addr = source_addr;
1029 makex25->neighbour = nb;
1030 makex25->facilities = facilities;
a64b7b93 1031 makex25->dte_facilities= dte_facilities;
1da177e4 1032 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
cb65d506
SP		 1033 /* ensure no reverse facil on accept */
1034 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
a64b7b93
SP		 1035 /* ensure no calling address extension on accept */
1036 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
cb65d506 1037 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1da177e4 1038
37cda787 1039 /* Normally all calls are accepted immediately */
1040 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
ebc3f64b
SP		 1041 x25_write_internal(make, X25_CALL_ACCEPTED);
1042 makex25->state = X25_STATE_3;
1043 }
1da177e4 1044
cb65d506
SP		 1045 /*
1046 * Incoming Call User Data.
1047 */
8db09f26
RK		 1048 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1049 makex25->calluserdata.cudlength = skb->len;
cb65d506 1050
1da177e4
LT		 1051 sk->sk_ack_backlog++;
1052
1053 x25_insert_socket(make);
1054
1055 skb_queue_head(&sk->sk_receive_queue, skb);
1056
1057 x25_start_heartbeat(make);
1058
1059 if (!sock_flag(sk, SOCK_DEAD))
1060 sk->sk_data_ready(sk, skb->len);
1061 rc = 1;
1062 sock_put(sk);
1063out:
1064 return rc;
1065out_sock_put:
1066 sock_put(sk);
1067out_clear_request:
1068 rc = 0;
1069 x25_transmit_clear_request(nb, lci, 0x01);
1070 goto out;
1071}
1072
1073static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1074 struct msghdr *msg, size_t len)
1075{
1076 struct sock *sk = sock->sk;
1077 struct x25_sock *x25 = x25_sk(sk);
1078 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1079 struct sockaddr_x25 sx25;
1080 struct sk_buff *skb;
1081 unsigned char *asmptr;
1082 int noblock = msg->msg_flags & MSG_DONTWAIT;
1083 size_t size;
1084 int qbit = 0, rc = -EINVAL;
1085
77b22836 1086 lock_sock(sk);
1da177e4
LT		 1087 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1088 goto out;
1089
1090 /* we currently don't support segmented records at the user interface */
1091 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1092 goto out;
1093
1094 rc = -EADDRNOTAVAIL;
1095 if (sock_flag(sk, SOCK_ZAPPED))
1096 goto out;
1097
1098 rc = -EPIPE;
1099 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1100 send_sig(SIGPIPE, current, 0);
1101 goto out;
1102 }
1103
1104 rc = -ENETUNREACH;
1105 if (!x25->neighbour)
1106 goto out;
1107
1108 if (usx25) {
1109 rc = -EINVAL;
1110 if (msg->msg_namelen < sizeof(sx25))
1111 goto out;
1112 memcpy(&sx25, usx25, sizeof(sx25));
1113 rc = -EISCONN;
1114 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1115 goto out;
1116 rc = -EINVAL;
1117 if (sx25.sx25_family != AF_X25)
1118 goto out;
1119 } else {
1120 /*
1121 * FIXME 1003.1g - if the socket is like this because
1122 * it has become closed (not started closed) we ought
1123 * to SIGPIPE, EPIPE;
1124 */
1125 rc = -ENOTCONN;
1126 if (sk->sk_state != TCP_ESTABLISHED)
1127 goto out;
1128
1129 sx25.sx25_family = AF_X25;
1130 sx25.sx25_addr = x25->dest_addr;
1131 }
1132
83e0bbcb
AC		 1133 /* Sanity check the packet size */
1134 if (len > 65535) {
1135 rc = -EMSGSIZE;
1136 goto out;
1137 }
1138
1da177e4
LT		 1139 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1140
1141 /* Build a packet */
1142 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1143
1144 if ((msg->msg_flags & MSG_OOB) && len > 32)
1145 len = 32;
1146
1147 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1148
77b22836 1149 release_sock(sk);
1da177e4 1150 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
77b22836 1151 lock_sock(sk);
1da177e4
LT		 1152 if (!skb)
1153 goto out;
1154 X25_SKB_CB(skb)->flags = msg->msg_flags;
1155
1156 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1157
1158 /*
1159 * Put the data on the end
1160 */
1161 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1162
eeeb0374
ACM		 1163 skb_reset_transport_header(skb);
1164 skb_put(skb, len);
1da177e4 1165
eeeb0374 1166 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1da177e4
LT		 1167 if (rc)
1168 goto out_kfree_skb;
1169
1170 /*
1171 * If the Q BIT Include socket option is in force, the first
1172 * byte of the user data is the logical value of the Q Bit.
1173 */
cb863ffd 1174 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1da177e4
LT		 1175 qbit = skb->data[0];
1176 skb_pull(skb, 1);
1177 }
1178
1179 /*
1180 * Push down the X.25 header
1181 */
1182 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1183
1184 if (msg->msg_flags & MSG_OOB) {
1185 if (x25->neighbour->extended) {
1186 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1187 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1188 *asmptr++ = (x25->lci >> 0) & 0xFF;
1189 *asmptr++ = X25_INTERRUPT;
1190 } else {
1191 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1192 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1193 *asmptr++ = (x25->lci >> 0) & 0xFF;
1194 *asmptr++ = X25_INTERRUPT;
1195 }
1196 } else {
1197 if (x25->neighbour->extended) {
1198 /* Build an Extended X.25 header */
1199 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1200 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1201 *asmptr++ = (x25->lci >> 0) & 0xFF;
1202 *asmptr++ = X25_DATA;
1203 *asmptr++ = X25_DATA;
1204 } else {
1205 /* Build an Standard X.25 header */
1206 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1207 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1208 *asmptr++ = (x25->lci >> 0) & 0xFF;
1209 *asmptr++ = X25_DATA;
1210 }
1211
1212 if (qbit)
1213 skb->data[0] |= X25_Q_BIT;
1214 }
1215
1216 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1217 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1218
1219 rc = -ENOTCONN;
1220 if (sk->sk_state != TCP_ESTABLISHED)
1221 goto out_kfree_skb;
1222
1223 if (msg->msg_flags & MSG_OOB)
1224 skb_queue_tail(&x25->interrupt_out_queue, skb);
1225 else {
8db09f26
RK		 1226 rc = x25_output(sk, skb);
1227 len = rc;
1228 if (rc < 0)
1da177e4 1229 kfree_skb(skb);
cb863ffd 1230 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1da177e4
LT		 1231 len++;
1232 }
1233
1da177e4 1234 x25_kick(sk);
1da177e4
LT		 1235 rc = len;
1236out:
77b22836 1237 release_sock(sk);
1da177e4
LT		 1238 return rc;
1239out_kfree_skb:
1240 kfree_skb(skb);
1241 goto out;
1242}
1243
1244
1245static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1246 struct msghdr *msg, size_t size,
1247 int flags)
1248{
1249 struct sock *sk = sock->sk;
1250 struct x25_sock *x25 = x25_sk(sk);
1251 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1252 size_t copied;
1253 int qbit;
1254 struct sk_buff *skb;
1255 unsigned char *asmptr;
1256 int rc = -ENOTCONN;
1257
77b22836 1258 lock_sock(sk);
1da177e4
LT		 1259 /*
1260 * This works for seqpacket too. The receiver has ordered the queue for
1261 * us! We do one quick check first though
1262 */
1263 if (sk->sk_state != TCP_ESTABLISHED)
1264 goto out;
1265
1266 if (flags & MSG_OOB) {
1267 rc = -EINVAL;
1268 if (sock_flag(sk, SOCK_URGINLINE) ||
1269 !skb_peek(&x25->interrupt_in_queue))
1270 goto out;
1271
1272 skb = skb_dequeue(&x25->interrupt_in_queue);
1273
1274 skb_pull(skb, X25_STD_MIN_LEN);
1275
1276 /*
1277 * No Q bit information on Interrupt data.
1278 */
cb863ffd 1279 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1da177e4
LT		 1280 asmptr = skb_push(skb, 1);
1281 *asmptr = 0x00;
1282 }
1283
1284 msg->msg_flags |= MSG_OOB;
1285 } else {
1286 /* Now we can treat all alike */
77b22836 1287 release_sock(sk);
1da177e4
LT		 1288 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1289 flags & MSG_DONTWAIT, &rc);
77b22836 1290 lock_sock(sk);
1da177e4
LT		 1291 if (!skb)
1292 goto out;
1293
1294 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1295
1296 skb_pull(skb, x25->neighbour->extended ?
1297 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1298
cb863ffd 1299 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1da177e4
LT		 1300 asmptr = skb_push(skb, 1);
1301 *asmptr = qbit;
1302 }
1303 }
1304
badff6d0 1305 skb_reset_transport_header(skb);
1da177e4
LT		 1306 copied = skb->len;
1307
1308 if (copied > size) {
1309 copied = size;
1310 msg->msg_flags |= MSG_TRUNC;
1311 }
1312
f8e1d201 1313 /* Currently, each datagram always contains a complete record */
1da177e4
LT		 1314 msg->msg_flags |= MSG_EOR;
1315
1316 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1317 if (rc)
1318 goto out_free_dgram;
1319
1320 if (sx25) {
1321 sx25->sx25_family = AF_X25;
1322 sx25->sx25_addr = x25->dest_addr;
1323 }
1324
1325 msg->msg_namelen = sizeof(struct sockaddr_x25);
1326
1da177e4 1327 x25_check_rbuf(sk);
1da177e4
LT		 1328 rc = copied;
1329out_free_dgram:
1330 skb_free_datagram(sk, skb);
1331out:
77b22836 1332 release_sock(sk);
1da177e4
LT		 1333 return rc;
1334}
1335
1336
1337static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1338{
1339 struct sock *sk = sock->sk;
1340 struct x25_sock *x25 = x25_sk(sk);
1341 void __user *argp = (void __user *)arg;
1342 int rc;
1343
1344 switch (cmd) {
fddc5f3e
JP		 1345 case TIOCOUTQ: {
1346 int amount;
1347
1348 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1349 if (amount < 0)
1350 amount = 0;
1351 rc = put_user(amount, (unsigned int __user *)argp);
1352 break;
1353 }
1da177e4 1354
fddc5f3e
JP		 1355 case TIOCINQ: {
1356 struct sk_buff *skb;
1357 int amount = 0;
1358 /*
1359 * These two are safe on a single CPU system as
1360 * only user tasks fiddle here
1361 */
1362 lock_sock(sk);
1363 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1364 amount = skb->len;
1365 release_sock(sk);
1366 rc = put_user(amount, (unsigned int __user *)argp);
1367 break;
1368 }
1da177e4 1369
fddc5f3e
JP		 1370 case SIOCGSTAMP:
1371 rc = -EINVAL;
1372 if (sk)
1373 rc = sock_get_timestamp(sk,
f8e1d201 1374 (struct timeval __user *)argp);
fddc5f3e
JP		 1375 break;
1376 case SIOCGSTAMPNS:
1377 rc = -EINVAL;
1378 if (sk)
1379 rc = sock_get_timestampns(sk,
1380 (struct timespec __user *)argp);
1381 break;
1382 case SIOCGIFADDR:
1383 case SIOCSIFADDR:
1384 case SIOCGIFDSTADDR:
1385 case SIOCSIFDSTADDR:
1386 case SIOCGIFBRDADDR:
1387 case SIOCSIFBRDADDR:
1388 case SIOCGIFNETMASK:
1389 case SIOCSIFNETMASK:
1390 case SIOCGIFMETRIC:
1391 case SIOCSIFMETRIC:
1392 rc = -EINVAL;
1393 break;
1394 case SIOCADDRT:
1395 case SIOCDELRT:
1396 rc = -EPERM;
1397 if (!capable(CAP_NET_ADMIN))
1da177e4 1398 break;
fddc5f3e
JP		 1399 rc = x25_route_ioctl(cmd, argp);
1400 break;
1401 case SIOCX25GSUBSCRIP:
1402 rc = x25_subscr_ioctl(cmd, argp);
1403 break;
1404 case SIOCX25SSUBSCRIP:
1405 rc = -EPERM;
1406 if (!capable(CAP_NET_ADMIN))
1da177e4 1407 break;
fddc5f3e
JP		 1408 rc = x25_subscr_ioctl(cmd, argp);
1409 break;
1410 case SIOCX25GFACILITIES: {
1411 lock_sock(sk);
1412 rc = copy_to_user(argp, &x25->facilities,
1413 sizeof(x25->facilities))
1414 ? -EFAULT : 0;
1415 release_sock(sk);
1416 break;
1417 }
1da177e4 1418
fddc5f3e
JP		 1419 case SIOCX25SFACILITIES: {
1420 struct x25_facilities facilities;
1421 rc = -EFAULT;
1422 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1423 break;
1424 rc = -EINVAL;
1425 lock_sock(sk);
1426 if (sk->sk_state != TCP_LISTEN &&
1427 sk->sk_state != TCP_CLOSE)
1428 goto out_fac_release;
1429 if (facilities.pacsize_in < X25_PS16 ||
1430 facilities.pacsize_in > X25_PS4096)
1431 goto out_fac_release;
1432 if (facilities.pacsize_out < X25_PS16 ||
1433 facilities.pacsize_out > X25_PS4096)
1434 goto out_fac_release;
1435 if (facilities.winsize_in < 1 ||
1436 facilities.winsize_in > 127)
1437 goto out_fac_release;
1438 if (facilities.throughput) {
1439 int out = facilities.throughput & 0xf0;
1440 int in = facilities.throughput & 0x0f;
1441 if (!out)
1442 facilities.throughput |=
1443 X25_DEFAULT_THROUGHPUT << 4;
1444 else if (out < 0x30 || out > 0xD0)
f90de660 1445 goto out_fac_release;
fddc5f3e
JP		 1446 if (!in)
1447 facilities.throughput |=
1448 X25_DEFAULT_THROUGHPUT;
1449 else if (in < 0x03 || in > 0x0D)
f90de660 1450 goto out_fac_release;
f8e1d201 1451 }
fddc5f3e
JP		 1452 if (facilities.reverse &&
1453 (facilities.reverse & 0x81) != 0x81)
1454 goto out_fac_release;
1455 x25->facilities = facilities;
1456 rc = 0;
1457out_fac_release:
1458 release_sock(sk);
1459 break;
1460 }
a64b7b93 1461
fddc5f3e
JP		 1462 case SIOCX25GDTEFACILITIES: {
1463 lock_sock(sk);
1464 rc = copy_to_user(argp, &x25->dte_facilities,
1465 sizeof(x25->dte_facilities));
1466 release_sock(sk);
1467 if (rc)
f8e1d201 1468 rc = -EFAULT;
fddc5f3e
JP		 1469 break;
1470 }
a64b7b93 1471
fddc5f3e
JP		 1472 case SIOCX25SDTEFACILITIES: {
1473 struct x25_dte_facilities dtefacs;
1474 rc = -EFAULT;
1475 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1da177e4 1476 break;
fddc5f3e
JP		 1477 rc = -EINVAL;
1478 lock_sock(sk);
1479 if (sk->sk_state != TCP_LISTEN &&
1480 sk->sk_state != TCP_CLOSE)
1481 goto out_dtefac_release;
1482 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1483 goto out_dtefac_release;
1484 if (dtefacs.calling_ae == NULL)
1485 goto out_dtefac_release;
1486 if (dtefacs.called_len > X25_MAX_AE_LEN)
1487 goto out_dtefac_release;
1488 if (dtefacs.called_ae == NULL)
1489 goto out_dtefac_release;
1490 x25->dte_facilities = dtefacs;
1491 rc = 0;
1492out_dtefac_release:
1493 release_sock(sk);
1494 break;
1495 }
1da177e4 1496
fddc5f3e
JP		 1497 case SIOCX25GCALLUSERDATA: {
1498 lock_sock(sk);
1499 rc = copy_to_user(argp, &x25->calluserdata,
1500 sizeof(x25->calluserdata))
1501 ? -EFAULT : 0;
1502 release_sock(sk);
1503 break;
1504 }
1da177e4 1505
fddc5f3e
JP		 1506 case SIOCX25SCALLUSERDATA: {
1507 struct x25_calluserdata calluserdata;
1da177e4 1508
fddc5f3e
JP		 1509 rc = -EFAULT;
1510 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1da177e4 1511 break;
fddc5f3e
JP		 1512 rc = -EINVAL;
1513 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1514 break;
1515 lock_sock(sk);
1516 x25->calluserdata = calluserdata;
1517 release_sock(sk);
1518 rc = 0;
1519 break;
1520 }
1da177e4 1521
fddc5f3e
JP		 1522 case SIOCX25GCAUSEDIAG: {
1523 lock_sock(sk);
1524 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1525 ? -EFAULT : 0;
1526 release_sock(sk);
1527 break;
1528 }
1529
1530 case SIOCX25SCAUSEDIAG: {
1531 struct x25_causediag causediag;
1532 rc = -EFAULT;
1533 if (copy_from_user(&causediag, argp, sizeof(causediag)))
386e50cc 1534 break;
fddc5f3e
JP		 1535 lock_sock(sk);
1536 x25->causediag = causediag;
1537 release_sock(sk);
1538 rc = 0;
1539 break;
386e50cc 1540
fddc5f3e 1541 }
386e50cc 1542
fddc5f3e
JP		 1543 case SIOCX25SCUDMATCHLEN: {
1544 struct x25_subaddr sub_addr;
1545 rc = -EINVAL;
1546 lock_sock(sk);
1547 if(sk->sk_state != TCP_CLOSE)
1548 goto out_cud_release;
1549 rc = -EFAULT;
1550 if (copy_from_user(&sub_addr, argp,
1551 sizeof(sub_addr)))
1552 goto out_cud_release;
1553 rc = -EINVAL;
1554 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1555 goto out_cud_release;
1556 x25->cudmatchlength = sub_addr.cudmatchlength;
1557 rc = 0;
3f0a069a 1558out_cud_release:
fddc5f3e
JP		 1559 release_sock(sk);
1560 break;
1561 }
cb65d506 1562
fddc5f3e
JP		 1563 case SIOCX25CALLACCPTAPPRV: {
1564 rc = -EINVAL;
1565 lock_sock(sk);
1566 if (sk->sk_state != TCP_CLOSE)
ebc3f64b 1567 break;
fddc5f3e
JP		 1568 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1569 release_sock(sk);
1570 rc = 0;
1571 break;
1572 }
ebc3f64b 1573
fddc5f3e
JP		 1574 case SIOCX25SENDCALLACCPT: {
1575 rc = -EINVAL;
1576 lock_sock(sk);
1577 if (sk->sk_state != TCP_ESTABLISHED)
ebc3f64b 1578 break;
fddc5f3e
JP		 1579 /* must call accptapprv above */
1580 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1da177e4 1581 break;
fddc5f3e
JP		 1582 x25_write_internal(sk, X25_CALL_ACCEPTED);
1583 x25->state = X25_STATE_3;
1584 release_sock(sk);
1585 rc = 0;
1586 break;
1587 }
1588
1589 default:
1590 rc = -ENOIOCTLCMD;
1591 break;
1da177e4
LT		 1592 }
1593
1594 return rc;
1595}
1596
ec1b4cf7 1597static const struct net_proto_family x25_family_ops = {
1da177e4
LT		 1598 .family = AF_X25,
1599 .create = x25_create,
1600 .owner = THIS_MODULE,
1601};
1602
1b06e6ba
SP		 1603#ifdef CONFIG_COMPAT
1604static int compat_x25_subscr_ioctl(unsigned int cmd,
1605 struct compat_x25_subscrip_struct __user *x25_subscr32)
1606{
1607 struct compat_x25_subscrip_struct x25_subscr;
1608 struct x25_neigh *nb;
1609 struct net_device *dev;
1610 int rc = -EINVAL;
1611
1612 rc = -EFAULT;
1613 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1614 goto out;
1615
1616 rc = -EINVAL;
1617 dev = x25_dev_get(x25_subscr.device);
1618 if (dev == NULL)
1619 goto out;
1620
1621 nb = x25_get_neigh(dev);
1622 if (nb == NULL)
1623 goto out_dev_put;
1624
1625 dev_put(dev);
1626
1627 if (cmd == SIOCX25GSUBSCRIP) {
5595a1a5 1628 read_lock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1629 x25_subscr.extended = nb->extended;
1630 x25_subscr.global_facil_mask = nb->global_facil_mask;
5595a1a5 1631 read_unlock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1632 rc = copy_to_user(x25_subscr32, &x25_subscr,
1633 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1634 } else {
1635 rc = -EINVAL;
1636 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1637 rc = 0;
5595a1a5 1638 write_lock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1639 nb->extended = x25_subscr.extended;
1640 nb->global_facil_mask = x25_subscr.global_facil_mask;
5595a1a5 1641 write_unlock_bh(&x25_neigh_list_lock);
1b06e6ba
SP		 1642 }
1643 }
1644 x25_neigh_put(nb);
1645out:
1646 return rc;
1647out_dev_put:
1648 dev_put(dev);
1649 goto out;
1650}
1651
1652static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1653 unsigned long arg)
1654{
1655 void __user *argp = compat_ptr(arg);
1656 struct sock *sk = sock->sk;
1657
1658 int rc = -ENOIOCTLCMD;
1659
1660 switch(cmd) {
1661 case TIOCOUTQ:
1662 case TIOCINQ:
1663 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1664 break;
1665 case SIOCGSTAMP:
1666 rc = -EINVAL;
1667 if (sk)
1668 rc = compat_sock_get_timestamp(sk,
1669 (struct timeval __user*)argp);
1670 break;
ae40eb1e
ED		 1671 case SIOCGSTAMPNS:
1672 rc = -EINVAL;
1673 if (sk)
1674 rc = compat_sock_get_timestampns(sk,
1675 (struct timespec __user*)argp);
1676 break;
1b06e6ba
SP		 1677 case SIOCGIFADDR:
1678 case SIOCSIFADDR:
1679 case SIOCGIFDSTADDR:
1680 case SIOCSIFDSTADDR:
1681 case SIOCGIFBRDADDR:
1682 case SIOCSIFBRDADDR:
1683 case SIOCGIFNETMASK:
1684 case SIOCSIFNETMASK:
1685 case SIOCGIFMETRIC:
1686 case SIOCSIFMETRIC:
1687 rc = -EINVAL;
1688 break;
1689 case SIOCADDRT:
1690 case SIOCDELRT:
1691 rc = -EPERM;
1692 if (!capable(CAP_NET_ADMIN))
1693 break;
1694 rc = x25_route_ioctl(cmd, argp);
1695 break;
1696 case SIOCX25GSUBSCRIP:
1697 rc = compat_x25_subscr_ioctl(cmd, argp);
1698 break;
1699 case SIOCX25SSUBSCRIP:
1700 rc = -EPERM;
1701 if (!capable(CAP_NET_ADMIN))
1702 break;
1703 rc = compat_x25_subscr_ioctl(cmd, argp);
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,
768190fd 1735 .poll = 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);
Linux 6.x block layer and io_uring tree(s)