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X.25 remove bkl in bind
[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>
5a0e3ad6 50#include <linux/slab.h>
1da177e4 51#include <net/sock.h>
c752f073 52#include <net/tcp_states.h>
1da177e4
LT		 53#include <asm/uaccess.h>
54#include <linux/fcntl.h>
55#include <linux/termios.h> /* For TIOCINQ/OUTQ */
56#include <linux/notifier.h>
57#include <linux/init.h>
1b06e6ba 58#include <linux/compat.h>
a9288525 59#include <linux/ctype.h>
1b06e6ba 60
1da177e4 61#include <net/x25.h>
1b06e6ba 62#include <net/compat.h>
1da177e4
LT		 63
64int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
65int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
66int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
67int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
68int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
39e21c0d 69int sysctl_x25_forward = 0;
1da177e4
LT		 70
71HLIST_HEAD(x25_list);
72DEFINE_RWLOCK(x25_list_lock);
73
90ddc4f0 74static const struct proto_ops x25_proto_ops;
1da177e4
LT		 75
76static struct x25_address null_x25_address = {" "};
77
1b06e6ba
SP		 78#ifdef CONFIG_COMPAT
79struct compat_x25_subscrip_struct {
80 char device[200-sizeof(compat_ulong_t)];
81 compat_ulong_t global_facil_mask;
82 compat_uint_t extended;
83};
84#endif
85
f5eb917b
JH		 86
87int x25_parse_address_block(struct sk_buff *skb,
88 struct x25_address *called_addr,
89 struct x25_address *calling_addr)
90{
91 unsigned char len;
92 int needed;
93 int rc;
94
95 if (skb->len < 1) {
96 /* packet has no address block */
97 rc = 0;
98 goto empty;
99 }
100
101 len = *skb->data;
102 needed = 1 + (len >> 4) + (len & 0x0f);
103
104 if (skb->len < needed) {
105 /* packet is too short to hold the addresses it claims
106 to hold */
107 rc = -1;
108 goto empty;
109 }
110
111 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
112
113empty:
114 *called_addr->x25_addr = 0;
115 *calling_addr->x25_addr = 0;
116
117 return rc;
118}
119
120
1da177e4
LT		 121int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
122 struct x25_address *calling_addr)
123{
6bf1574e 124 unsigned int called_len, calling_len;
1da177e4 125 char *called, *calling;
6bf1574e 126 unsigned int i;
1da177e4
LT		 127
128 called_len = (*p >> 0) & 0x0F;
129 calling_len = (*p >> 4) & 0x0F;
130
131 called = called_addr->x25_addr;
132 calling = calling_addr->x25_addr;
133 p++;
134
135 for (i = 0; i < (called_len + calling_len); i++) {
136 if (i < called_len) {
137 if (i % 2 != 0) {
138 *called++ = ((*p >> 0) & 0x0F) + '0';
139 p++;
140 } else {
141 *called++ = ((*p >> 4) & 0x0F) + '0';
142 }
143 } else {
144 if (i % 2 != 0) {
145 *calling++ = ((*p >> 0) & 0x0F) + '0';
146 p++;
147 } else {
148 *calling++ = ((*p >> 4) & 0x0F) + '0';
149 }
150 }
151 }
152
153 *called = *calling = '\0';
154
155 return 1 + (called_len + calling_len + 1) / 2;
156}
157
158int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
159 struct x25_address *calling_addr)
160{
161 unsigned int called_len, calling_len;
162 char *called, *calling;
163 int i;
164
165 called = called_addr->x25_addr;
166 calling = calling_addr->x25_addr;
167
168 called_len = strlen(called);
169 calling_len = strlen(calling);
170
171 *p++ = (calling_len << 4) | (called_len << 0);
172
173 for (i = 0; i < (called_len + calling_len); i++) {
174 if (i < called_len) {
175 if (i % 2 != 0) {
176 *p |= (*called++ - '0') << 0;
177 p++;
178 } else {
179 *p = 0x00;
180 *p |= (*called++ - '0') << 4;
181 }
182 } else {
183 if (i % 2 != 0) {
184 *p |= (*calling++ - '0') << 0;
185 p++;
186 } else {
187 *p = 0x00;
188 *p |= (*calling++ - '0') << 4;
189 }
190 }
191 }
192
193 return 1 + (called_len + calling_len + 1) / 2;
194}
195
196/*
197 * Socket removal during an interrupt is now safe.
198 */
199static void x25_remove_socket(struct sock *sk)
200{
201 write_lock_bh(&x25_list_lock);
202 sk_del_node_init(sk);
203 write_unlock_bh(&x25_list_lock);
204}
205
206/*
207 * Kill all bound sockets on a dropped device.
208 */
209static void x25_kill_by_device(struct net_device *dev)
210{
211 struct sock *s;
212 struct hlist_node *node;
213
214 write_lock_bh(&x25_list_lock);
215
216 sk_for_each(s, node, &x25_list)
217 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
218 x25_disconnect(s, ENETUNREACH, 0, 0);
219
220 write_unlock_bh(&x25_list_lock);
221}
222
223/*
224 * Handle device status changes.
225 */
226static int x25_device_event(struct notifier_block *this, unsigned long event,
227 void *ptr)
228{
229 struct net_device *dev = ptr;
230 struct x25_neigh *nb;
231
721499e8 232 if (!net_eq(dev_net(dev), &init_net))
e9dc8653
EB		 233 return NOTIFY_DONE;
234
1da177e4
LT		 235 if (dev->type == ARPHRD_X25
236#if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
237 || dev->type == ARPHRD_ETHER
238#endif
239 ) {
240 switch (event) {
241 case NETDEV_UP:
242 x25_link_device_up(dev);
243 break;
244 case NETDEV_GOING_DOWN:
245 nb = x25_get_neigh(dev);
246 if (nb) {
247 x25_terminate_link(nb);
248 x25_neigh_put(nb);
249 }
250 break;
251 case NETDEV_DOWN:
252 x25_kill_by_device(dev);
253 x25_route_device_down(dev);
254 x25_link_device_down(dev);
255 break;
256 }
257 }
258
259 return NOTIFY_DONE;
260}
261
262/*
263 * Add a socket to the bound sockets list.
264 */
265static void x25_insert_socket(struct sock *sk)
266{
267 write_lock_bh(&x25_list_lock);
268 sk_add_node(sk, &x25_list);
269 write_unlock_bh(&x25_list_lock);
270}
271
272/*
273 * Find a socket that wants to accept the Call Request we just
274 * received. Check the full list for an address/cud match.
275 * If no cuds match return the next_best thing, an address match.
276 * Note: if a listening socket has cud set it must only get calls
277 * with matching cud.
278 */
cb65d506
SP		 279static struct sock *x25_find_listener(struct x25_address *addr,
280 struct sk_buff *skb)
1da177e4
LT		 281{
282 struct sock *s;
283 struct sock *next_best;
284 struct hlist_node *node;
285
286 read_lock_bh(&x25_list_lock);
287 next_best = NULL;
288
289 sk_for_each(s, node, &x25_list)
290 if ((!strcmp(addr->x25_addr,
cb65d506
SP		 291 x25_sk(s)->source_addr.x25_addr) ||
292 !strcmp(addr->x25_addr,
293 null_x25_address.x25_addr)) &&
294 s->sk_state == TCP_LISTEN) {
1da177e4
LT		 295 /*
296 * Found a listening socket, now check the incoming
297 * call user data vs this sockets call user data
298 */
cb65d506 299 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
f8e1d201
YH		 300 if((memcmp(x25_sk(s)->calluserdata.cuddata,
301 skb->data,
cb65d506
SP		 302 x25_sk(s)->cudmatchlength)) == 0) {
303 sock_hold(s);
304 goto found;
305 }
306 } else
1da177e4 307 next_best = s;
1da177e4
LT		 308 }
309 if (next_best) {
310 s = next_best;
311 sock_hold(s);
312 goto found;
313 }
314 s = NULL;
315found:
316 read_unlock_bh(&x25_list_lock);
317 return s;
318}
319
320/*
321 * Find a connected X.25 socket given my LCI and neighbour.
322 */
323static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
324{
325 struct sock *s;
326 struct hlist_node *node;
327
328 sk_for_each(s, node, &x25_list)
329 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
330 sock_hold(s);
331 goto found;
332 }
333 s = NULL;
334found:
335 return s;
336}
337
338struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
339{
340 struct sock *s;
341
342 read_lock_bh(&x25_list_lock);
343 s = __x25_find_socket(lci, nb);
344 read_unlock_bh(&x25_list_lock);
345 return s;
346}
347
348/*
349 * Find a unique LCI for a given device.
350 */
351static unsigned int x25_new_lci(struct x25_neigh *nb)
352{
353 unsigned int lci = 1;
354 struct sock *sk;
355
356 read_lock_bh(&x25_list_lock);
357
358 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
359 sock_put(sk);
360 if (++lci == 4096) {
361 lci = 0;
362 break;
363 }
364 }
365
366 read_unlock_bh(&x25_list_lock);
367 return lci;
368}
369
370/*
371 * Deferred destroy.
372 */
14ebaf81 373static void __x25_destroy_socket(struct sock *);
1da177e4
LT		 374
375/*
376 * handler for deferred kills.
377 */
378static void x25_destroy_timer(unsigned long data)
379{
14ebaf81 380 x25_destroy_socket_from_timer((struct sock *)data);
1da177e4
LT		 381}
382
383/*
384 * This is called from user mode and the timers. Thus it protects itself
385 * against interrupt users but doesn't worry about being called during
386 * work. Once it is removed from the queue no interrupt or bottom half
387 * will touch it and we are (fairly 8-) ) safe.
388 * Not static as it's used by the timer
389 */
14ebaf81 390static void __x25_destroy_socket(struct sock *sk)
1da177e4
LT		 391{
392 struct sk_buff *skb;
393
1da177e4
LT		 394 x25_stop_heartbeat(sk);
395 x25_stop_timer(sk);
396
397 x25_remove_socket(sk);
398 x25_clear_queues(sk); /* Flush the queues */
399
400 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
401 if (skb->sk != sk) { /* A pending connection */
402 /*
403 * Queue the unaccepted socket for death
404 */
2cec6b01 405 skb->sk->sk_state = TCP_LISTEN;
1da177e4
LT		 406 sock_set_flag(skb->sk, SOCK_DEAD);
407 x25_start_heartbeat(skb->sk);
408 x25_sk(skb->sk)->state = X25_STATE_0;
409 }
410
411 kfree_skb(skb);
412 }
413
c564039f 414 if (sk_has_allocations(sk)) {
1da177e4
LT		 415 /* Defer: outstanding buffers */
416 sk->sk_timer.expires = jiffies + 10 * HZ;
417 sk->sk_timer.function = x25_destroy_timer;
418 sk->sk_timer.data = (unsigned long)sk;
419 add_timer(&sk->sk_timer);
420 } else {
421 /* drop last reference so sock_put will free */
422 __sock_put(sk);
423 }
14ebaf81 424}
1da177e4 425
14ebaf81
DM		 426void x25_destroy_socket_from_timer(struct sock *sk)
427{
428 sock_hold(sk);
429 bh_lock_sock(sk);
430 __x25_destroy_socket(sk);
431 bh_unlock_sock(sk);
432 sock_put(sk);
433}
434
435static void x25_destroy_socket(struct sock *sk)
436{
437 sock_hold(sk);
438 lock_sock(sk);
439 __x25_destroy_socket(sk);
1da177e4
LT		 440 release_sock(sk);
441 sock_put(sk);
442}
443
444/*
445 * Handling for system calls applied via the various interfaces to a
446 * X.25 socket object.
447 */
448
449static int x25_setsockopt(struct socket *sock, int level, int optname,
b7058842 450 char __user *optval, unsigned int optlen)
1da177e4
LT		 451{
452 int opt;
453 struct sock *sk = sock->sk;
454 int rc = -ENOPROTOOPT;
455
456 if (level != SOL_X25 || optname != X25_QBITINCL)
457 goto out;
458
459 rc = -EINVAL;
460 if (optlen < sizeof(int))
461 goto out;
462
463 rc = -EFAULT;
464 if (get_user(opt, (int __user *)optval))
465 goto out;
466
cb863ffd 467 if (opt)
468 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
469 else
470 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
1da177e4
LT		 471 rc = 0;
472out:
473 return rc;
474}
475
476static int x25_getsockopt(struct socket *sock, int level, int optname,
477 char __user *optval, int __user *optlen)
478{
479 struct sock *sk = sock->sk;
480 int val, len, rc = -ENOPROTOOPT;
f8e1d201 481
1da177e4
LT		 482 if (level != SOL_X25 || optname != X25_QBITINCL)
483 goto out;
484
485 rc = -EFAULT;
486 if (get_user(len, optlen))
487 goto out;
488
489 len = min_t(unsigned int, len, sizeof(int));
490
491 rc = -EINVAL;
492 if (len < 0)
493 goto out;
f8e1d201 494
1da177e4
LT		 495 rc = -EFAULT;
496 if (put_user(len, optlen))
497 goto out;
498
cb863ffd 499 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
1da177e4
LT		 500 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
501out:
502 return rc;
503}
504
505static int x25_listen(struct socket *sock, int backlog)
506{
507 struct sock *sk = sock->sk;
508 int rc = -EOPNOTSUPP;
509
25aa4efe 510 lock_sock(sk);
1da177e4
LT		 511 if (sk->sk_state != TCP_LISTEN) {
512 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
513 sk->sk_max_ack_backlog = backlog;
514 sk->sk_state = TCP_LISTEN;
515 rc = 0;
516 }
25aa4efe 517 release_sock(sk);
1da177e4
LT		 518
519 return rc;
520}
521
522static struct proto x25_proto = {
523 .name = "X25",
524 .owner = THIS_MODULE,
525 .obj_size = sizeof(struct x25_sock),
526};
527
1b8d7ae4 528static struct sock *x25_alloc_socket(struct net *net)
1da177e4
LT		 529{
530 struct x25_sock *x25;
6257ff21 531 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
1da177e4
LT		 532
533 if (!sk)
534 goto out;
535
536 sock_init_data(NULL, sk);
537
538 x25 = x25_sk(sk);
539 skb_queue_head_init(&x25->ack_queue);
540 skb_queue_head_init(&x25->fragment_queue);
541 skb_queue_head_init(&x25->interrupt_in_queue);
542 skb_queue_head_init(&x25->interrupt_out_queue);
543out:
544 return sk;
545}
546
3f378b68
EP		 547static int x25_create(struct net *net, struct socket *sock, int protocol,
548 int kern)
1da177e4
LT		 549{
550 struct sock *sk;
551 struct x25_sock *x25;
b18e7a06 552 int rc = -EAFNOSUPPORT;
1da177e4 553
09ad9bc7 554 if (!net_eq(net, &init_net))
b18e7a06 555 goto out;
556
557 rc = -ESOCKTNOSUPPORT;
558 if (sock->type != SOCK_SEQPACKET)
559 goto out;
1b8d7ae4 560
b18e7a06 561 rc = -EINVAL;
562 if (protocol)
1da177e4
LT		 563 goto out;
564
b18e7a06 565 rc = -ENOBUFS;
1b8d7ae4 566 if ((sk = x25_alloc_socket(net)) == NULL)
1da177e4
LT		 567 goto out;
568
569 x25 = x25_sk(sk);
570
571 sock_init_data(sock, sk);
572
573 x25_init_timers(sk);
574
575 sock->ops = &x25_proto_ops;
576 sk->sk_protocol = protocol;
577 sk->sk_backlog_rcv = x25_backlog_rcv;
578
579 x25->t21 = sysctl_x25_call_request_timeout;
580 x25->t22 = sysctl_x25_reset_request_timeout;
581 x25->t23 = sysctl_x25_clear_request_timeout;
582 x25->t2 = sysctl_x25_ack_holdback_timeout;
583 x25->state = X25_STATE_0;
cb65d506 584 x25->cudmatchlength = 0;
37cda787 585 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
ebc3f64b 586 /* on call accept */
1da177e4
LT		 587
588 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
589 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
590 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
591 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
ddd0451f
JH		 592 x25->facilities.throughput = 0; /* by default don't negotiate
593 throughput */
1da177e4 594 x25->facilities.reverse = X25_DEFAULT_REVERSE;
f8e1d201
YH		 595 x25->dte_facilities.calling_len = 0;
596 x25->dte_facilities.called_len = 0;
597 memset(x25->dte_facilities.called_ae, '\0',
598 sizeof(x25->dte_facilities.called_ae));
599 memset(x25->dte_facilities.calling_ae, '\0',
600 sizeof(x25->dte_facilities.calling_ae));
a64b7b93 601
1da177e4
LT		 602 rc = 0;
603out:
604 return rc;
605}
606
607static struct sock *x25_make_new(struct sock *osk)
608{
609 struct sock *sk = NULL;
610 struct x25_sock *x25, *ox25;
611
612 if (osk->sk_type != SOCK_SEQPACKET)
613 goto out;
614
3b1e0a65 615 if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
1da177e4
LT		 616 goto out;
617
618 x25 = x25_sk(sk);
619
620 sk->sk_type = osk->sk_type;
1da177e4
LT		 621 sk->sk_priority = osk->sk_priority;
622 sk->sk_protocol = osk->sk_protocol;
623 sk->sk_rcvbuf = osk->sk_rcvbuf;
624 sk->sk_sndbuf = osk->sk_sndbuf;
625 sk->sk_state = TCP_ESTABLISHED;
1da177e4 626 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
a20a8554 627 sock_copy_flags(sk, osk);
1da177e4
LT		 628
629 ox25 = x25_sk(osk);
630 x25->t21 = ox25->t21;
631 x25->t22 = ox25->t22;
632 x25->t23 = ox25->t23;
633 x25->t2 = ox25->t2;
cb863ffd 634 x25->flags = ox25->flags;
1da177e4 635 x25->facilities = ox25->facilities;
a64b7b93 636 x25->dte_facilities = ox25->dte_facilities;
cb65d506 637 x25->cudmatchlength = ox25->cudmatchlength;
1da177e4 638
b7792e34 639 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
1da177e4
LT		 640 x25_init_timers(sk);
641out:
642 return sk;
643}
644
645static int x25_release(struct socket *sock)
646{
647 struct sock *sk = sock->sk;
648 struct x25_sock *x25;
649
91774904 650 lock_kernel();
1da177e4
LT		 651 if (!sk)
652 goto out;
653
654 x25 = x25_sk(sk);
655
656 switch (x25->state) {
657
658 case X25_STATE_0:
659 case X25_STATE_2:
660 x25_disconnect(sk, 0, 0, 0);
661 x25_destroy_socket(sk);
662 goto out;
663
664 case X25_STATE_1:
665 case X25_STATE_3:
666 case X25_STATE_4:
667 x25_clear_queues(sk);
668 x25_write_internal(sk, X25_CLEAR_REQUEST);
669 x25_start_t23timer(sk);
670 x25->state = X25_STATE_2;
671 sk->sk_state = TCP_CLOSE;
672 sk->sk_shutdown |= SEND_SHUTDOWN;
673 sk->sk_state_change(sk);
674 sock_set_flag(sk, SOCK_DEAD);
675 sock_set_flag(sk, SOCK_DESTROY);
676 break;
677 }
678
c751e4f8 679 sock_orphan(sk);
1da177e4 680out:
91774904 681 unlock_kernel();
1da177e4
LT		 682 return 0;
683}
684
685static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
686{
687 struct sock *sk = sock->sk;
688 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
a9288525 689 int len, i, rc = 0;
1da177e4
LT		 690
691 if (!sock_flag(sk, SOCK_ZAPPED) ||
692 addr_len != sizeof(struct sockaddr_x25) ||
91774904
AB		 693 addr->sx25_family != AF_X25) {
694 rc = -EINVAL;
695 goto out;
696 }
1da177e4 697
a9288525 698 len = strlen(addr->sx25_addr.x25_addr);
699 for (i = 0; i < len; i++) {
700 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
701 rc = -EINVAL;
702 goto out;
703 }
704 }
705
90c27297 706 lock_sock(sk);
1da177e4
LT		 707 x25_sk(sk)->source_addr = addr->sx25_addr;
708 x25_insert_socket(sk);
709 sock_reset_flag(sk, SOCK_ZAPPED);
90c27297 710 release_sock(sk);
1da177e4 711 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
91774904 712out:
91774904 713 return rc;
1da177e4
LT		 714}
715
716static int x25_wait_for_connection_establishment(struct sock *sk)
717{
718 DECLARE_WAITQUEUE(wait, current);
f8e1d201 719 int rc;
1da177e4 720
aa395145 721 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 722 for (;;) {
723 __set_current_state(TASK_INTERRUPTIBLE);
724 rc = -ERESTARTSYS;
725 if (signal_pending(current))
726 break;
727 rc = sock_error(sk);
728 if (rc) {
729 sk->sk_socket->state = SS_UNCONNECTED;
730 break;
731 }
732 rc = 0;
733 if (sk->sk_state != TCP_ESTABLISHED) {
734 release_sock(sk);
735 schedule();
736 lock_sock(sk);
737 } else
738 break;
739 }
740 __set_current_state(TASK_RUNNING);
aa395145 741 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 742 return rc;
743}
744
745static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
746 int addr_len, int flags)
747{
748 struct sock *sk = sock->sk;
749 struct x25_sock *x25 = x25_sk(sk);
750 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
751 struct x25_route *rt;
752 int rc = 0;
753
91774904 754 lock_kernel();
1da177e4
LT		 755 lock_sock(sk);
756 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
757 sock->state = SS_CONNECTED;
758 goto out; /* Connect completed during a ERESTARTSYS event */
759 }
760
761 rc = -ECONNREFUSED;
762 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
763 sock->state = SS_UNCONNECTED;
764 goto out;
765 }
766
767 rc = -EISCONN; /* No reconnect on a seqpacket socket */
768 if (sk->sk_state == TCP_ESTABLISHED)
769 goto out;
770
f8e1d201 771 sk->sk_state = TCP_CLOSE;
1da177e4
LT		 772 sock->state = SS_UNCONNECTED;
773
774 rc = -EINVAL;
775 if (addr_len != sizeof(struct sockaddr_x25) ||
776 addr->sx25_family != AF_X25)
777 goto out;
778
779 rc = -ENETUNREACH;
780 rt = x25_get_route(&addr->sx25_addr);
781 if (!rt)
782 goto out;
783
784 x25->neighbour = x25_get_neigh(rt->dev);
785 if (!x25->neighbour)
786 goto out_put_route;
787
788 x25_limit_facilities(&x25->facilities, x25->neighbour);
789
790 x25->lci = x25_new_lci(x25->neighbour);
791 if (!x25->lci)
792 goto out_put_neigh;
793
794 rc = -EINVAL;
795 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
796 goto out_put_neigh;
797
798 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
799 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
800
801 x25->dest_addr = addr->sx25_addr;
802
803 /* Move to connecting socket, start sending Connect Requests */
804 sock->state = SS_CONNECTING;
805 sk->sk_state = TCP_SYN_SENT;
806
807 x25->state = X25_STATE_1;
808
809 x25_write_internal(sk, X25_CALL_REQUEST);
810
811 x25_start_heartbeat(sk);
812 x25_start_t21timer(sk);
813
814 /* Now the loop */
815 rc = -EINPROGRESS;
816 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
817 goto out_put_neigh;
818
819 rc = x25_wait_for_connection_establishment(sk);
820 if (rc)
821 goto out_put_neigh;
822
823 sock->state = SS_CONNECTED;
824 rc = 0;
825out_put_neigh:
826 if (rc)
827 x25_neigh_put(x25->neighbour);
828out_put_route:
829 x25_route_put(rt);
830out:
831 release_sock(sk);
91774904 832 unlock_kernel();
1da177e4
LT		 833 return rc;
834}
835
bac37ec8 836static int x25_wait_for_data(struct sock *sk, long timeout)
1da177e4
LT		 837{
838 DECLARE_WAITQUEUE(wait, current);
839 int rc = 0;
840
aa395145 841 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 842 for (;;) {
843 __set_current_state(TASK_INTERRUPTIBLE);
844 if (sk->sk_shutdown & RCV_SHUTDOWN)
845 break;
846 rc = -ERESTARTSYS;
847 if (signal_pending(current))
848 break;
849 rc = -EAGAIN;
850 if (!timeout)
851 break;
852 rc = 0;
853 if (skb_queue_empty(&sk->sk_receive_queue)) {
854 release_sock(sk);
855 timeout = schedule_timeout(timeout);
856 lock_sock(sk);
857 } else
858 break;
859 }
860 __set_current_state(TASK_RUNNING);
aa395145 861 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 862 return rc;
863}
f8e1d201 864
1da177e4
LT		 865static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
866{
867 struct sock *sk = sock->sk;
868 struct sock *newsk;
869 struct sk_buff *skb;
870 int rc = -EINVAL;
871
91774904 872 lock_kernel();
1da177e4
LT		 873 if (!sk || sk->sk_state != TCP_LISTEN)
874 goto out;
875
876 rc = -EOPNOTSUPP;
877 if (sk->sk_type != SOCK_SEQPACKET)
878 goto out;
879
880 lock_sock(sk);
881 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
882 if (rc)
883 goto out2;
884 skb = skb_dequeue(&sk->sk_receive_queue);
885 rc = -EINVAL;
886 if (!skb->sk)
887 goto out2;
888 newsk = skb->sk;
b61d38e0 889 sock_graft(newsk, newsock);
1da177e4
LT		 890
891 /* Now attach up the new socket */
892 skb->sk = NULL;
893 kfree_skb(skb);
894 sk->sk_ack_backlog--;
1da177e4
LT		 895 newsock->state = SS_CONNECTED;
896 rc = 0;
897out2:
898 release_sock(sk);
899out:
91774904 900 unlock_kernel();
1da177e4
LT		 901 return rc;
902}
903
904static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
905 int *uaddr_len, int peer)
906{
907 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
908 struct sock *sk = sock->sk;
909 struct x25_sock *x25 = x25_sk(sk);
91774904 910 int rc = 0;
1da177e4 911
91774904 912 lock_kernel();
1da177e4 913 if (peer) {
91774904
AB		 914 if (sk->sk_state != TCP_ESTABLISHED) {
915 rc = -ENOTCONN;
916 goto out;
917 }
1da177e4
LT		 918 sx25->sx25_addr = x25->dest_addr;
919 } else
920 sx25->sx25_addr = x25->source_addr;
921
922 sx25->sx25_family = AF_X25;
923 *uaddr_len = sizeof(*sx25);
924
91774904
AB		 925out:
926 unlock_kernel();
927 return rc;
928}
929
930static unsigned int x25_datagram_poll(struct file *file, struct socket *sock,
931 poll_table *wait)
932{
933 int rc;
934
935 lock_kernel();
936 rc = datagram_poll(file, sock, wait);
937 unlock_kernel();
938
939 return rc;
1da177e4 940}
f8e1d201 941
1da177e4
LT		 942int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
943 unsigned int lci)
944{
945 struct sock *sk;
946 struct sock *make;
947 struct x25_sock *makex25;
948 struct x25_address source_addr, dest_addr;
949 struct x25_facilities facilities;
a64b7b93 950 struct x25_dte_facilities dte_facilities;
95a9dc43 951 int len, addr_len, rc;
1da177e4
LT		 952
953 /*
954 * Remove the LCI and frame type.
955 */
956 skb_pull(skb, X25_STD_MIN_LEN);
957
958 /*
959 * Extract the X.25 addresses and convert them to ASCII strings,
960 * and remove them.
f5eb917b
JH		 961 *
962 * Address block is mandatory in call request packets
1da177e4 963 */
f5eb917b
JH		 964 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
965 if (addr_len <= 0)
966 goto out_clear_request;
95a9dc43 967 skb_pull(skb, addr_len);
1da177e4
LT		 968
969 /*
970 * Get the length of the facilities, skip past them for the moment
971 * get the call user data because this is needed to determine
972 * the correct listener
f5eb917b
JH		 973 *
974 * Facilities length is mandatory in call request packets
1da177e4 975 */
f5eb917b
JH		 976 if (skb->len < 1)
977 goto out_clear_request;
1da177e4 978 len = skb->data[0] + 1;
f5eb917b
JH		 979 if (skb->len < len)
980 goto out_clear_request;
1da177e4
LT		 981 skb_pull(skb,len);
982
1da177e4
LT		 983 /*
984 * Find a listener for the particular address/cud pair.
985 */
cb65d506
SP		 986 sk = x25_find_listener(&source_addr,skb);
987 skb_push(skb,len);
1da177e4 988
95a9dc43
AH		 989 if (sk != NULL && sk_acceptq_is_full(sk)) {
990 goto out_sock_put;
991 }
992
1da177e4 993 /*
95a9dc43
AH		 994 * We dont have any listeners for this incoming call.
995 * Try forwarding it.
1da177e4 996 */
95a9dc43
AH		 997 if (sk == NULL) {
998 skb_push(skb, addr_len + X25_STD_MIN_LEN);
39e21c0d
AH		 999 if (sysctl_x25_forward &&
1000 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
95a9dc43
AH		 1001 {
1002 /* Call was forwarded, dont process it any more */
1003 kfree_skb(skb);
1004 rc = 1;
1005 goto out;
1006 } else {
1007 /* No listeners, can't forward, clear the call */
1008 goto out_clear_request;
1009 }
1010 }
1da177e4
LT		 1011
1012 /*
1013 * Try to reach a compromise on the requested facilities.
1014 */
a64b7b93
SP		 1015 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1016 if (len == -1)
1da177e4
LT		 1017 goto out_sock_put;
1018
1019 /*
1020 * current neighbour/link might impose additional limits
1021 * on certain facilties
1022 */
1023
1024 x25_limit_facilities(&facilities, nb);
1025
1026 /*
1027 * Try to create a new socket.
1028 */
1029 make = x25_make_new(sk);
1030 if (!make)
1031 goto out_sock_put;
1032
1033 /*
1034 * Remove the facilities
1035 */
1036 skb_pull(skb, len);
1037
1038 skb->sk = make;
1039 make->sk_state = TCP_ESTABLISHED;
1040
1041 makex25 = x25_sk(make);
1042 makex25->lci = lci;
1043 makex25->dest_addr = dest_addr;
1044 makex25->source_addr = source_addr;
1045 makex25->neighbour = nb;
1046 makex25->facilities = facilities;
a64b7b93 1047 makex25->dte_facilities= dte_facilities;
1da177e4 1048 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
cb65d506
SP		 1049 /* ensure no reverse facil on accept */
1050 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
a64b7b93
SP		 1051 /* ensure no calling address extension on accept */
1052 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
cb65d506 1053 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1da177e4 1054
37cda787 1055 /* Normally all calls are accepted immediately */
1056 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
ebc3f64b
SP		 1057 x25_write_internal(make, X25_CALL_ACCEPTED);
1058 makex25->state = X25_STATE_3;
1059 }
1da177e4 1060
cb65d506
SP		 1061 /*
1062 * Incoming Call User Data.
1063 */
8db09f26
RK		 1064 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1065 makex25->calluserdata.cudlength = skb->len;
cb65d506 1066
1da177e4
LT		 1067 sk->sk_ack_backlog++;
1068
1069 x25_insert_socket(make);
1070
1071 skb_queue_head(&sk->sk_receive_queue, skb);
1072
1073 x25_start_heartbeat(make);
1074
1075 if (!sock_flag(sk, SOCK_DEAD))
1076 sk->sk_data_ready(sk, skb->len);
1077 rc = 1;
1078 sock_put(sk);
1079out:
1080 return rc;
1081out_sock_put:
1082 sock_put(sk);
1083out_clear_request:
1084 rc = 0;
1085 x25_transmit_clear_request(nb, lci, 0x01);
1086 goto out;
1087}
1088
1089static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1090 struct msghdr *msg, size_t len)
1091{
1092 struct sock *sk = sock->sk;
1093 struct x25_sock *x25 = x25_sk(sk);
1094 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1095 struct sockaddr_x25 sx25;
1096 struct sk_buff *skb;
1097 unsigned char *asmptr;
1098 int noblock = msg->msg_flags & MSG_DONTWAIT;
1099 size_t size;
1100 int qbit = 0, rc = -EINVAL;
1101
91774904 1102 lock_kernel();
1da177e4
LT		 1103 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1104 goto out;
1105
1106 /* we currently don't support segmented records at the user interface */
1107 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1108 goto out;
1109
1110 rc = -EADDRNOTAVAIL;
1111 if (sock_flag(sk, SOCK_ZAPPED))
1112 goto out;
1113
1114 rc = -EPIPE;
1115 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1116 send_sig(SIGPIPE, current, 0);
1117 goto out;
1118 }
1119
1120 rc = -ENETUNREACH;
1121 if (!x25->neighbour)
1122 goto out;
1123
1124 if (usx25) {
1125 rc = -EINVAL;
1126 if (msg->msg_namelen < sizeof(sx25))
1127 goto out;
1128 memcpy(&sx25, usx25, sizeof(sx25));
1129 rc = -EISCONN;
1130 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1131 goto out;
1132 rc = -EINVAL;
1133 if (sx25.sx25_family != AF_X25)
1134 goto out;
1135 } else {
1136 /*
1137 * FIXME 1003.1g - if the socket is like this because
1138 * it has become closed (not started closed) we ought
1139 * to SIGPIPE, EPIPE;
1140 */
1141 rc = -ENOTCONN;
1142 if (sk->sk_state != TCP_ESTABLISHED)
1143 goto out;
1144
1145 sx25.sx25_family = AF_X25;
1146 sx25.sx25_addr = x25->dest_addr;
1147 }
1148
83e0bbcb
AC		 1149 /* Sanity check the packet size */
1150 if (len > 65535) {
1151 rc = -EMSGSIZE;
1152 goto out;
1153 }
1154
1da177e4
LT		 1155 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1156
1157 /* Build a packet */
1158 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1159
1160 if ((msg->msg_flags & MSG_OOB) && len > 32)
1161 len = 32;
1162
1163 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1164
1165 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1166 if (!skb)
1167 goto out;
1168 X25_SKB_CB(skb)->flags = msg->msg_flags;
1169
1170 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1171
1172 /*
1173 * Put the data on the end
1174 */
1175 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1176
eeeb0374
ACM		 1177 skb_reset_transport_header(skb);
1178 skb_put(skb, len);
1da177e4 1179
eeeb0374 1180 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1da177e4
LT		 1181 if (rc)
1182 goto out_kfree_skb;
1183
1184 /*
1185 * If the Q BIT Include socket option is in force, the first
1186 * byte of the user data is the logical value of the Q Bit.
1187 */
cb863ffd 1188 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1da177e4
LT		 1189 qbit = skb->data[0];
1190 skb_pull(skb, 1);
1191 }
1192
1193 /*
1194 * Push down the X.25 header
1195 */
1196 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1197
1198 if (msg->msg_flags & MSG_OOB) {
1199 if (x25->neighbour->extended) {
1200 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1201 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1202 *asmptr++ = (x25->lci >> 0) & 0xFF;
1203 *asmptr++ = X25_INTERRUPT;
1204 } else {
1205 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1206 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1207 *asmptr++ = (x25->lci >> 0) & 0xFF;
1208 *asmptr++ = X25_INTERRUPT;
1209 }
1210 } else {
1211 if (x25->neighbour->extended) {
1212 /* Build an Extended X.25 header */
1213 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1214 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1215 *asmptr++ = (x25->lci >> 0) & 0xFF;
1216 *asmptr++ = X25_DATA;
1217 *asmptr++ = X25_DATA;
1218 } else {
1219 /* Build an Standard X.25 header */
1220 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1221 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1222 *asmptr++ = (x25->lci >> 0) & 0xFF;
1223 *asmptr++ = X25_DATA;
1224 }
1225
1226 if (qbit)
1227 skb->data[0] |= X25_Q_BIT;
1228 }
1229
1230 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1231 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1232
1233 rc = -ENOTCONN;
1234 if (sk->sk_state != TCP_ESTABLISHED)
1235 goto out_kfree_skb;
1236
1237 if (msg->msg_flags & MSG_OOB)
1238 skb_queue_tail(&x25->interrupt_out_queue, skb);
1239 else {
8db09f26
RK		 1240 rc = x25_output(sk, skb);
1241 len = rc;
1242 if (rc < 0)
1da177e4 1243 kfree_skb(skb);
cb863ffd 1244 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1da177e4
LT		 1245 len++;
1246 }
1247
1248 /*
1249 * lock_sock() is currently only used to serialize this x25_kick()
1250 * against input-driven x25_kick() calls. It currently only blocks
1251 * incoming packets for this socket and does not protect against
1252 * any other socket state changes and is not called from anywhere
1253 * else. As x25_kick() cannot block and as long as all socket
1254 * operations are BKL-wrapped, we don't need take to care about
1255 * purging the backlog queue in x25_release().
1256 *
1257 * Using lock_sock() to protect all socket operations entirely
1258 * (and making the whole x25 stack SMP aware) unfortunately would
1259 * require major changes to {send,recv}msg and skb allocation methods.
1260 * -> 2.5 ;)
1261 */
1262 lock_sock(sk);
1263 x25_kick(sk);
1264 release_sock(sk);
1265 rc = len;
1266out:
91774904 1267 unlock_kernel();
1da177e4
LT		 1268 return rc;
1269out_kfree_skb:
1270 kfree_skb(skb);
1271 goto out;
1272}
1273
1274
1275static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1276 struct msghdr *msg, size_t size,
1277 int flags)
1278{
1279 struct sock *sk = sock->sk;
1280 struct x25_sock *x25 = x25_sk(sk);
1281 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1282 size_t copied;
1283 int qbit;
1284 struct sk_buff *skb;
1285 unsigned char *asmptr;
1286 int rc = -ENOTCONN;
1287
91774904 1288 lock_kernel();
1da177e4
LT		 1289 /*
1290 * This works for seqpacket too. The receiver has ordered the queue for
1291 * us! We do one quick check first though
1292 */
1293 if (sk->sk_state != TCP_ESTABLISHED)
1294 goto out;
1295
1296 if (flags & MSG_OOB) {
1297 rc = -EINVAL;
1298 if (sock_flag(sk, SOCK_URGINLINE) ||
1299 !skb_peek(&x25->interrupt_in_queue))
1300 goto out;
1301
1302 skb = skb_dequeue(&x25->interrupt_in_queue);
1303
1304 skb_pull(skb, X25_STD_MIN_LEN);
1305
1306 /*
1307 * No Q bit information on Interrupt data.
1308 */
cb863ffd 1309 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1da177e4
LT		 1310 asmptr = skb_push(skb, 1);
1311 *asmptr = 0x00;
1312 }
1313
1314 msg->msg_flags |= MSG_OOB;
1315 } else {
1316 /* Now we can treat all alike */
1317 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1318 flags & MSG_DONTWAIT, &rc);
1319 if (!skb)
1320 goto out;
1321
1322 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1323
1324 skb_pull(skb, x25->neighbour->extended ?
1325 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1326
cb863ffd 1327 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1da177e4
LT		 1328 asmptr = skb_push(skb, 1);
1329 *asmptr = qbit;
1330 }
1331 }
1332
badff6d0 1333 skb_reset_transport_header(skb);
1da177e4
LT		 1334 copied = skb->len;
1335
1336 if (copied > size) {
1337 copied = size;
1338 msg->msg_flags |= MSG_TRUNC;
1339 }
1340
f8e1d201 1341 /* Currently, each datagram always contains a complete record */
1da177e4
LT		 1342 msg->msg_flags |= MSG_EOR;
1343
1344 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1345 if (rc)
1346 goto out_free_dgram;
1347
1348 if (sx25) {
1349 sx25->sx25_family = AF_X25;
1350 sx25->sx25_addr = x25->dest_addr;
1351 }
1352
1353 msg->msg_namelen = sizeof(struct sockaddr_x25);
1354
1355 lock_sock(sk);
1356 x25_check_rbuf(sk);
1357 release_sock(sk);
1358 rc = copied;
1359out_free_dgram:
1360 skb_free_datagram(sk, skb);
1361out:
91774904 1362 unlock_kernel();
1da177e4
LT		 1363 return rc;
1364}
1365
1366
1367static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1368{
1369 struct sock *sk = sock->sk;
1370 struct x25_sock *x25 = x25_sk(sk);
1371 void __user *argp = (void __user *)arg;
1372 int rc;
1373
91774904 1374 lock_kernel();
1da177e4
LT		 1375 switch (cmd) {
1376 case TIOCOUTQ: {
31e6d363
ED		 1377 int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1378
1da177e4
LT		 1379 if (amount < 0)
1380 amount = 0;
1381 rc = put_user(amount, (unsigned int __user *)argp);
1382 break;
1383 }
1384
1385 case TIOCINQ: {
1386 struct sk_buff *skb;
1387 int amount = 0;
1388 /*
1389 * These two are safe on a single CPU system as
1390 * only user tasks fiddle here
1391 */
1392 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1393 amount = skb->len;
1394 rc = put_user(amount, (unsigned int __user *)argp);
1395 break;
1396 }
1397
1398 case SIOCGSTAMP:
1399 rc = -EINVAL;
1400 if (sk)
f8e1d201
YH		 1401 rc = sock_get_timestamp(sk,
1402 (struct timeval __user *)argp);
1da177e4 1403 break;
ae40eb1e
ED		 1404 case SIOCGSTAMPNS:
1405 rc = -EINVAL;
1406 if (sk)
1407 rc = sock_get_timestampns(sk,
1408 (struct timespec __user *)argp);
1409 break;
1da177e4
LT		 1410 case SIOCGIFADDR:
1411 case SIOCSIFADDR:
1412 case SIOCGIFDSTADDR:
1413 case SIOCSIFDSTADDR:
1414 case SIOCGIFBRDADDR:
1415 case SIOCSIFBRDADDR:
1416 case SIOCGIFNETMASK:
1417 case SIOCSIFNETMASK:
1418 case SIOCGIFMETRIC:
1419 case SIOCSIFMETRIC:
1420 rc = -EINVAL;
1421 break;
1422 case SIOCADDRT:
1423 case SIOCDELRT:
1424 rc = -EPERM;
1425 if (!capable(CAP_NET_ADMIN))
1426 break;
1427 rc = x25_route_ioctl(cmd, argp);
1428 break;
1429 case SIOCX25GSUBSCRIP:
1430 rc = x25_subscr_ioctl(cmd, argp);
1431 break;
1432 case SIOCX25SSUBSCRIP:
1433 rc = -EPERM;
1434 if (!capable(CAP_NET_ADMIN))
1435 break;
1436 rc = x25_subscr_ioctl(cmd, argp);
1437 break;
1438 case SIOCX25GFACILITIES: {
1439 struct x25_facilities fac = x25->facilities;
1440 rc = copy_to_user(argp, &fac,
1441 sizeof(fac)) ? -EFAULT : 0;
1442 break;
1443 }
1444
1445 case SIOCX25SFACILITIES: {
1446 struct x25_facilities facilities;
1447 rc = -EFAULT;
1448 if (copy_from_user(&facilities, argp,
1449 sizeof(facilities)))
1450 break;
1451 rc = -EINVAL;
1452 if (sk->sk_state != TCP_LISTEN &&
1453 sk->sk_state != TCP_CLOSE)
1454 break;
1455 if (facilities.pacsize_in < X25_PS16 ||
1456 facilities.pacsize_in > X25_PS4096)
1457 break;
1458 if (facilities.pacsize_out < X25_PS16 ||
1459 facilities.pacsize_out > X25_PS4096)
1460 break;
1461 if (facilities.winsize_in < 1 ||
1462 facilities.winsize_in > 127)
1463 break;
ddd0451f
JH		 1464 if (facilities.throughput) {
1465 int out = facilities.throughput & 0xf0;
1466 int in = facilities.throughput & 0x0f;
1467 if (!out)
1468 facilities.throughput |=
1469 X25_DEFAULT_THROUGHPUT << 4;
1470 else if (out < 0x30 || out > 0xD0)
1471 break;
1472 if (!in)
1473 facilities.throughput |=
1474 X25_DEFAULT_THROUGHPUT;
1475 else if (in < 0x03 || in > 0x0D)
1476 break;
1477 }
ebc3f64b 1478 if (facilities.reverse &&
06a96b33 1479 (facilities.reverse & 0x81) != 0x81)
1da177e4
LT		 1480 break;
1481 x25->facilities = facilities;
1482 rc = 0;
1483 break;
1484 }
1485
a64b7b93 1486 case SIOCX25GDTEFACILITIES: {
f8e1d201 1487 rc = copy_to_user(argp, &x25->dte_facilities,
a64b7b93
SP		 1488 sizeof(x25->dte_facilities));
1489 if (rc)
1490 rc = -EFAULT;
f8e1d201
YH		 1491 break;
1492 }
a64b7b93 1493
f8e1d201
YH		 1494 case SIOCX25SDTEFACILITIES: {
1495 struct x25_dte_facilities dtefacs;
1496 rc = -EFAULT;
1497 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
a64b7b93
SP		 1498 break;
1499 rc = -EINVAL;
1500 if (sk->sk_state != TCP_LISTEN &&
1501 sk->sk_state != TCP_CLOSE)
1502 break;
1503 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1504 break;
1505 if (dtefacs.calling_ae == NULL)
1506 break;
1507 if (dtefacs.called_len > X25_MAX_AE_LEN)
1508 break;
1509 if (dtefacs.called_ae == NULL)
1510 break;
1511 x25->dte_facilities = dtefacs;
1512 rc = 0;
1513 break;
1514 }
1515
1da177e4
LT		 1516 case SIOCX25GCALLUSERDATA: {
1517 struct x25_calluserdata cud = x25->calluserdata;
1518 rc = copy_to_user(argp, &cud,
1519 sizeof(cud)) ? -EFAULT : 0;
1520 break;
1521 }
1522
1523 case SIOCX25SCALLUSERDATA: {
1524 struct x25_calluserdata calluserdata;
1525
1526 rc = -EFAULT;
1527 if (copy_from_user(&calluserdata, argp,
1528 sizeof(calluserdata)))
1529 break;
1530 rc = -EINVAL;
1531 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1532 break;
1533 x25->calluserdata = calluserdata;
1534 rc = 0;
1535 break;
1536 }
1537
1538 case SIOCX25GCAUSEDIAG: {
1539 struct x25_causediag causediag;
1540 causediag = x25->causediag;
1541 rc = copy_to_user(argp, &causediag,
1542 sizeof(causediag)) ? -EFAULT : 0;
1543 break;
1544 }
1545
386e50cc
AH		 1546 case SIOCX25SCAUSEDIAG: {
1547 struct x25_causediag causediag;
1548 rc = -EFAULT;
1549 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1550 break;
1551 x25->causediag = causediag;
1552 rc = 0;
1553 break;
1554
1555 }
1556
cb65d506
SP		 1557 case SIOCX25SCUDMATCHLEN: {
1558 struct x25_subaddr sub_addr;
1559 rc = -EINVAL;
1560 if(sk->sk_state != TCP_CLOSE)
1561 break;
1562 rc = -EFAULT;
1563 if (copy_from_user(&sub_addr, argp,
1564 sizeof(sub_addr)))
1565 break;
f8e1d201 1566 rc = -EINVAL;
cb65d506
SP		 1567 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1568 break;
1569 x25->cudmatchlength = sub_addr.cudmatchlength;
1570 rc = 0;
1571 break;
1572 }
1573
ebc3f64b
SP		 1574 case SIOCX25CALLACCPTAPPRV: {
1575 rc = -EINVAL;
1576 if (sk->sk_state != TCP_CLOSE)
1577 break;
37cda787 1578 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
ebc3f64b
SP		 1579 rc = 0;
1580 break;
1581 }
1582
1583 case SIOCX25SENDCALLACCPT: {
1584 rc = -EINVAL;
1585 if (sk->sk_state != TCP_ESTABLISHED)
1586 break;
37cda787 1587 /* must call accptapprv above */
1588 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
ebc3f64b
SP		 1589 break;
1590 x25_write_internal(sk, X25_CALL_ACCEPTED);
1591 x25->state = X25_STATE_3;
1592 rc = 0;
1593 break;
1594 }
1595
f8e1d201 1596 default:
b5e5fa5e 1597 rc = -ENOIOCTLCMD;
1da177e4
LT		 1598 break;
1599 }
91774904 1600 unlock_kernel();
1da177e4
LT		 1601
1602 return rc;
1603}
1604
ec1b4cf7 1605static const struct net_proto_family x25_family_ops = {
1da177e4
LT		 1606 .family = AF_X25,
1607 .create = x25_create,
1608 .owner = THIS_MODULE,
1609};
1610
1b06e6ba
SP		 1611#ifdef CONFIG_COMPAT
1612static int compat_x25_subscr_ioctl(unsigned int cmd,
1613 struct compat_x25_subscrip_struct __user *x25_subscr32)
1614{
1615 struct compat_x25_subscrip_struct x25_subscr;
1616 struct x25_neigh *nb;
1617 struct net_device *dev;
1618 int rc = -EINVAL;
1619
1620 rc = -EFAULT;
1621 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1622 goto out;
1623
1624 rc = -EINVAL;
1625 dev = x25_dev_get(x25_subscr.device);
1626 if (dev == NULL)
1627 goto out;
1628
1629 nb = x25_get_neigh(dev);
1630 if (nb == NULL)
1631 goto out_dev_put;
1632
1633 dev_put(dev);
1634
1635 if (cmd == SIOCX25GSUBSCRIP) {
1636 x25_subscr.extended = nb->extended;
1637 x25_subscr.global_facil_mask = nb->global_facil_mask;
1638 rc = copy_to_user(x25_subscr32, &x25_subscr,
1639 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1640 } else {
1641 rc = -EINVAL;
1642 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1643 rc = 0;
1644 nb->extended = x25_subscr.extended;
1645 nb->global_facil_mask = x25_subscr.global_facil_mask;
1646 }
1647 }
1648 x25_neigh_put(nb);
1649out:
1650 return rc;
1651out_dev_put:
1652 dev_put(dev);
1653 goto out;
1654}
1655
1656static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1657 unsigned long arg)
1658{
1659 void __user *argp = compat_ptr(arg);
1660 struct sock *sk = sock->sk;
1661
1662 int rc = -ENOIOCTLCMD;
1663
1664 switch(cmd) {
1665 case TIOCOUTQ:
1666 case TIOCINQ:
1667 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1668 break;
1669 case SIOCGSTAMP:
1670 rc = -EINVAL;
91774904 1671 lock_kernel();
1b06e6ba
SP		 1672 if (sk)
1673 rc = compat_sock_get_timestamp(sk,
1674 (struct timeval __user*)argp);
91774904 1675 unlock_kernel();
1b06e6ba 1676 break;
ae40eb1e
ED		 1677 case SIOCGSTAMPNS:
1678 rc = -EINVAL;
91774904 1679 lock_kernel();
ae40eb1e
ED		 1680 if (sk)
1681 rc = compat_sock_get_timestampns(sk,
1682 (struct timespec __user*)argp);
91774904 1683 unlock_kernel();
ae40eb1e 1684 break;
1b06e6ba
SP		 1685 case SIOCGIFADDR:
1686 case SIOCSIFADDR:
1687 case SIOCGIFDSTADDR:
1688 case SIOCSIFDSTADDR:
1689 case SIOCGIFBRDADDR:
1690 case SIOCSIFBRDADDR:
1691 case SIOCGIFNETMASK:
1692 case SIOCSIFNETMASK:
1693 case SIOCGIFMETRIC:
1694 case SIOCSIFMETRIC:
1695 rc = -EINVAL;
1696 break;
1697 case SIOCADDRT:
1698 case SIOCDELRT:
1699 rc = -EPERM;
1700 if (!capable(CAP_NET_ADMIN))
1701 break;
91774904 1702 lock_kernel();
1b06e6ba 1703 rc = x25_route_ioctl(cmd, argp);
91774904 1704 unlock_kernel();
1b06e6ba
SP		 1705 break;
1706 case SIOCX25GSUBSCRIP:
91774904 1707 lock_kernel();
1b06e6ba 1708 rc = compat_x25_subscr_ioctl(cmd, argp);
91774904 1709 unlock_kernel();
1b06e6ba
SP		 1710 break;
1711 case SIOCX25SSUBSCRIP:
1712 rc = -EPERM;
1713 if (!capable(CAP_NET_ADMIN))
1714 break;
91774904 1715 lock_kernel();
1b06e6ba 1716 rc = compat_x25_subscr_ioctl(cmd, argp);
91774904 1717 unlock_kernel();
1b06e6ba
SP		 1718 break;
1719 case SIOCX25GFACILITIES:
1720 case SIOCX25SFACILITIES:
9a6b9f2e
SP		 1721 case SIOCX25GDTEFACILITIES:
1722 case SIOCX25SDTEFACILITIES:
1b06e6ba
SP		 1723 case SIOCX25GCALLUSERDATA:
1724 case SIOCX25SCALLUSERDATA:
1725 case SIOCX25GCAUSEDIAG:
386e50cc 1726 case SIOCX25SCAUSEDIAG:
1b06e6ba
SP		 1727 case SIOCX25SCUDMATCHLEN:
1728 case SIOCX25CALLACCPTAPPRV:
1729 case SIOCX25SENDCALLACCPT:
1730 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1731 break;
1732 default:
1733 rc = -ENOIOCTLCMD;
1734 break;
1735 }
1736 return rc;
1737}
1738#endif
1739
91774904 1740static const struct proto_ops x25_proto_ops = {
1da177e4
LT		 1741 .family = AF_X25,
1742 .owner = THIS_MODULE,
1743 .release = x25_release,
1744 .bind = x25_bind,
1745 .connect = x25_connect,
1746 .socketpair = sock_no_socketpair,
1747 .accept = x25_accept,
1748 .getname = x25_getname,
91774904 1749 .poll = x25_datagram_poll,
1da177e4 1750 .ioctl = x25_ioctl,
1b06e6ba
SP		 1751#ifdef CONFIG_COMPAT
1752 .compat_ioctl = compat_x25_ioctl,
1753#endif
1da177e4
LT		 1754 .listen = x25_listen,
1755 .shutdown = sock_no_shutdown,
1756 .setsockopt = x25_setsockopt,
1757 .getsockopt = x25_getsockopt,
1758 .sendmsg = x25_sendmsg,
1759 .recvmsg = x25_recvmsg,
1760 .mmap = sock_no_mmap,
1761 .sendpage = sock_no_sendpage,
1762};
1763
7546dd97 1764static struct packet_type x25_packet_type __read_mostly = {
09640e63 1765 .type = cpu_to_be16(ETH_P_X25),
1da177e4
LT		 1766 .func = x25_lapb_receive_frame,
1767};
1768
1769static struct notifier_block x25_dev_notifier = {
1770 .notifier_call = x25_device_event,
1771};
1772
1773void x25_kill_by_neigh(struct x25_neigh *nb)
1774{
1775 struct sock *s;
1776 struct hlist_node *node;
1777
1778 write_lock_bh(&x25_list_lock);
1779
1780 sk_for_each(s, node, &x25_list)
1781 if (x25_sk(s)->neighbour == nb)
1782 x25_disconnect(s, ENETUNREACH, 0, 0);
1783
1784 write_unlock_bh(&x25_list_lock);
95a9dc43
AH		 1785
1786 /* Remove any related forwards */
1787 x25_clear_forward_by_dev(nb->dev);
1da177e4
LT		 1788}
1789
1790static int __init x25_init(void)
1791{
1792 int rc = proto_register(&x25_proto, 0);
1793
1794 if (rc != 0)
1795 goto out;
1796
1fd975a0 1797 rc = sock_register(&x25_family_ops);
1798 if (rc != 0)
1799 goto out_proto;
1da177e4
LT		 1800
1801 dev_add_pack(&x25_packet_type);
1802
1fd975a0 1803 rc = register_netdevice_notifier(&x25_dev_notifier);
1804 if (rc != 0)
1805 goto out_sock;
1da177e4 1806
a44562e4 1807 printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1da177e4 1808
1da177e4 1809 x25_register_sysctl();
1fd975a0 1810 rc = x25_proc_init();
1811 if (rc != 0)
1812 goto out_dev;
1da177e4
LT		 1813out:
1814 return rc;
1fd975a0 1815out_dev:
1816 unregister_netdevice_notifier(&x25_dev_notifier);
1817out_sock:
1818 sock_unregister(AF_X25);
1819out_proto:
1820 proto_unregister(&x25_proto);
1821 goto out;
1da177e4
LT		 1822}
1823module_init(x25_init);
1824
1825static void __exit x25_exit(void)
1826{
1827 x25_proc_exit();
1828 x25_link_free();
1829 x25_route_free();
1830
1da177e4 1831 x25_unregister_sysctl();
1da177e4
LT		 1832
1833 unregister_netdevice_notifier(&x25_dev_notifier);
1834
1835 dev_remove_pack(&x25_packet_type);
1836
1837 sock_unregister(AF_X25);
1838 proto_unregister(&x25_proto);
1839}
1840module_exit(x25_exit);
1841
1842MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1843MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1844MODULE_LICENSE("GPL");
1845MODULE_ALIAS_NETPROTO(PF_X25);
Clone of davem's net-next-2.6 tree