forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
af_x25.c
1825 lines (1566 loc) · 39.8 KB
/
af_x25.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* X.25 Packet Layer release 002
*
* This is ALPHA test software. This code may break your machine,
* randomly fail to work with new releases, misbehave and/or generally
* screw up. It might even work.
*
* This code REQUIRES 2.1.15 or higher
*
* This module:
* This module is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* History
* X.25 001 Jonathan Naylor Started coding.
* X.25 002 Jonathan Naylor Centralised disconnect handling.
* New timer architecture.
* 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant.
* 2000-03-22 Daniela Squassoni Allowed disabling/enabling of
* facilities negotiation and increased
* the throughput upper limit.
* 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups
* 2000-09-04 Henner Eisen Set sock->state in x25_accept().
* Fixed x25_output() related skb leakage.
* 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket.
* 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation.
* 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN
* 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
* x25_proc.c, using seq_file
* 2005-04-02 Shaun Pereira Selective sub address matching
* with call user data
* 2005-04-15 Shaun Pereira Fast select with no restriction on
* response
*/
#include <linux/module.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <asm/uaccess.h>
#include <linux/fcntl.h>
#include <linux/termios.h> /* For TIOCINQ/OUTQ */
#include <linux/notifier.h>
#include <linux/init.h>
#include <linux/compat.h>
#include <linux/ctype.h>
#include <net/x25.h>
#include <net/compat.h>
int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
int sysctl_x25_forward = 0;
HLIST_HEAD(x25_list);
DEFINE_RWLOCK(x25_list_lock);
static const struct proto_ops x25_proto_ops;
static struct x25_address null_x25_address = {" "};
#ifdef CONFIG_COMPAT
struct compat_x25_subscrip_struct {
char device[200-sizeof(compat_ulong_t)];
compat_ulong_t global_facil_mask;
compat_uint_t extended;
};
#endif
int x25_parse_address_block(struct sk_buff *skb,
struct x25_address *called_addr,
struct x25_address *calling_addr)
{
unsigned char len;
int needed;
int rc;
if (skb->len < 1) {
/* packet has no address block */
rc = 0;
goto empty;
}
len = *skb->data;
needed = 1 + (len >> 4) + (len & 0x0f);
if (skb->len < needed) {
/* packet is too short to hold the addresses it claims
to hold */
rc = -1;
goto empty;
}
return x25_addr_ntoa(skb->data, called_addr, calling_addr);
empty:
*called_addr->x25_addr = 0;
*calling_addr->x25_addr = 0;
return rc;
}
int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
struct x25_address *calling_addr)
{
unsigned int called_len, calling_len;
char *called, *calling;
unsigned int i;
called_len = (*p >> 0) & 0x0F;
calling_len = (*p >> 4) & 0x0F;
called = called_addr->x25_addr;
calling = calling_addr->x25_addr;
p++;
for (i = 0; i < (called_len + calling_len); i++) {
if (i < called_len) {
if (i % 2 != 0) {
*called++ = ((*p >> 0) & 0x0F) + '0';
p++;
} else {
*called++ = ((*p >> 4) & 0x0F) + '0';
}
} else {
if (i % 2 != 0) {
*calling++ = ((*p >> 0) & 0x0F) + '0';
p++;
} else {
*calling++ = ((*p >> 4) & 0x0F) + '0';
}
}
}
*called = *calling = '\0';
return 1 + (called_len + calling_len + 1) / 2;
}
int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
struct x25_address *calling_addr)
{
unsigned int called_len, calling_len;
char *called, *calling;
int i;
called = called_addr->x25_addr;
calling = calling_addr->x25_addr;
called_len = strlen(called);
calling_len = strlen(calling);
*p++ = (calling_len << 4) | (called_len << 0);
for (i = 0; i < (called_len + calling_len); i++) {
if (i < called_len) {
if (i % 2 != 0) {
*p |= (*called++ - '0') << 0;
p++;
} else {
*p = 0x00;
*p |= (*called++ - '0') << 4;
}
} else {
if (i % 2 != 0) {
*p |= (*calling++ - '0') << 0;
p++;
} else {
*p = 0x00;
*p |= (*calling++ - '0') << 4;
}
}
}
return 1 + (called_len + calling_len + 1) / 2;
}
/*
* Socket removal during an interrupt is now safe.
*/
static void x25_remove_socket(struct sock *sk)
{
write_lock_bh(&x25_list_lock);
sk_del_node_init(sk);
write_unlock_bh(&x25_list_lock);
}
/*
* Kill all bound sockets on a dropped device.
*/
static void x25_kill_by_device(struct net_device *dev)
{
struct sock *s;
struct hlist_node *node;
write_lock_bh(&x25_list_lock);
sk_for_each(s, node, &x25_list)
if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
x25_disconnect(s, ENETUNREACH, 0, 0);
write_unlock_bh(&x25_list_lock);
}
/*
* Handle device status changes.
*/
static int x25_device_event(struct notifier_block *this, unsigned long event,
void *ptr)
{
struct net_device *dev = ptr;
struct x25_neigh *nb;
if (!net_eq(dev_net(dev), &init_net))
return NOTIFY_DONE;
if (dev->type == ARPHRD_X25
#if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
|| dev->type == ARPHRD_ETHER
#endif
) {
switch (event) {
case NETDEV_UP:
x25_link_device_up(dev);
break;
case NETDEV_GOING_DOWN:
nb = x25_get_neigh(dev);
if (nb) {
x25_terminate_link(nb);
x25_neigh_put(nb);
}
break;
case NETDEV_DOWN:
x25_kill_by_device(dev);
x25_route_device_down(dev);
x25_link_device_down(dev);
break;
}
}
return NOTIFY_DONE;
}
/*
* Add a socket to the bound sockets list.
*/
static void x25_insert_socket(struct sock *sk)
{
write_lock_bh(&x25_list_lock);
sk_add_node(sk, &x25_list);
write_unlock_bh(&x25_list_lock);
}
/*
* Find a socket that wants to accept the Call Request we just
* received. Check the full list for an address/cud match.
* If no cuds match return the next_best thing, an address match.
* Note: if a listening socket has cud set it must only get calls
* with matching cud.
*/
static struct sock *x25_find_listener(struct x25_address *addr,
struct sk_buff *skb)
{
struct sock *s;
struct sock *next_best;
struct hlist_node *node;
read_lock_bh(&x25_list_lock);
next_best = NULL;
sk_for_each(s, node, &x25_list)
if ((!strcmp(addr->x25_addr,
x25_sk(s)->source_addr.x25_addr) ||
!strcmp(addr->x25_addr,
null_x25_address.x25_addr)) &&
s->sk_state == TCP_LISTEN) {
/*
* Found a listening socket, now check the incoming
* call user data vs this sockets call user data
*/
if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
if((memcmp(x25_sk(s)->calluserdata.cuddata,
skb->data,
x25_sk(s)->cudmatchlength)) == 0) {
sock_hold(s);
goto found;
}
} else
next_best = s;
}
if (next_best) {
s = next_best;
sock_hold(s);
goto found;
}
s = NULL;
found:
read_unlock_bh(&x25_list_lock);
return s;
}
/*
* Find a connected X.25 socket given my LCI and neighbour.
*/
static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
{
struct sock *s;
struct hlist_node *node;
sk_for_each(s, node, &x25_list)
if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
sock_hold(s);
goto found;
}
s = NULL;
found:
return s;
}
struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
{
struct sock *s;
read_lock_bh(&x25_list_lock);
s = __x25_find_socket(lci, nb);
read_unlock_bh(&x25_list_lock);
return s;
}
/*
* Find a unique LCI for a given device.
*/
static unsigned int x25_new_lci(struct x25_neigh *nb)
{
unsigned int lci = 1;
struct sock *sk;
read_lock_bh(&x25_list_lock);
while ((sk = __x25_find_socket(lci, nb)) != NULL) {
sock_put(sk);
if (++lci == 4096) {
lci = 0;
break;
}
}
read_unlock_bh(&x25_list_lock);
return lci;
}
/*
* Deferred destroy.
*/
static void __x25_destroy_socket(struct sock *);
/*
* handler for deferred kills.
*/
static void x25_destroy_timer(unsigned long data)
{
x25_destroy_socket_from_timer((struct sock *)data);
}
/*
* This is called from user mode and the timers. Thus it protects itself
* against interrupt users but doesn't worry about being called during
* work. Once it is removed from the queue no interrupt or bottom half
* will touch it and we are (fairly 8-) ) safe.
* Not static as it's used by the timer
*/
static void __x25_destroy_socket(struct sock *sk)
{
struct sk_buff *skb;
x25_stop_heartbeat(sk);
x25_stop_timer(sk);
x25_remove_socket(sk);
x25_clear_queues(sk); /* Flush the queues */
while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
if (skb->sk != sk) { /* A pending connection */
/*
* Queue the unaccepted socket for death
*/
skb->sk->sk_state = TCP_LISTEN;
sock_set_flag(skb->sk, SOCK_DEAD);
x25_start_heartbeat(skb->sk);
x25_sk(skb->sk)->state = X25_STATE_0;
}
kfree_skb(skb);
}
if (sk_has_allocations(sk)) {
/* Defer: outstanding buffers */
sk->sk_timer.expires = jiffies + 10 * HZ;
sk->sk_timer.function = x25_destroy_timer;
sk->sk_timer.data = (unsigned long)sk;
add_timer(&sk->sk_timer);
} else {
/* drop last reference so sock_put will free */
__sock_put(sk);
}
}
void x25_destroy_socket_from_timer(struct sock *sk)
{
sock_hold(sk);
bh_lock_sock(sk);
__x25_destroy_socket(sk);
bh_unlock_sock(sk);
sock_put(sk);
}
/*
* Handling for system calls applied via the various interfaces to a
* X.25 socket object.
*/
static int x25_setsockopt(struct socket *sock, int level, int optname,
char __user *optval, unsigned int optlen)
{
int opt;
struct sock *sk = sock->sk;
int rc = -ENOPROTOOPT;
if (level != SOL_X25 || optname != X25_QBITINCL)
goto out;
rc = -EINVAL;
if (optlen < sizeof(int))
goto out;
rc = -EFAULT;
if (get_user(opt, (int __user *)optval))
goto out;
if (opt)
set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
else
clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
rc = 0;
out:
return rc;
}
static int x25_getsockopt(struct socket *sock, int level, int optname,
char __user *optval, int __user *optlen)
{
struct sock *sk = sock->sk;
int val, len, rc = -ENOPROTOOPT;
if (level != SOL_X25 || optname != X25_QBITINCL)
goto out;
rc = -EFAULT;
if (get_user(len, optlen))
goto out;
len = min_t(unsigned int, len, sizeof(int));
rc = -EINVAL;
if (len < 0)
goto out;
rc = -EFAULT;
if (put_user(len, optlen))
goto out;
val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
out:
return rc;
}
static int x25_listen(struct socket *sock, int backlog)
{
struct sock *sk = sock->sk;
int rc = -EOPNOTSUPP;
lock_sock(sk);
if (sk->sk_state != TCP_LISTEN) {
memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
sk->sk_max_ack_backlog = backlog;
sk->sk_state = TCP_LISTEN;
rc = 0;
}
release_sock(sk);
return rc;
}
static struct proto x25_proto = {
.name = "X25",
.owner = THIS_MODULE,
.obj_size = sizeof(struct x25_sock),
};
static struct sock *x25_alloc_socket(struct net *net)
{
struct x25_sock *x25;
struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
if (!sk)
goto out;
sock_init_data(NULL, sk);
x25 = x25_sk(sk);
skb_queue_head_init(&x25->ack_queue);
skb_queue_head_init(&x25->fragment_queue);
skb_queue_head_init(&x25->interrupt_in_queue);
skb_queue_head_init(&x25->interrupt_out_queue);
out:
return sk;
}
static int x25_create(struct net *net, struct socket *sock, int protocol,
int kern)
{
struct sock *sk;
struct x25_sock *x25;
int rc = -EAFNOSUPPORT;
if (!net_eq(net, &init_net))
goto out;
rc = -ESOCKTNOSUPPORT;
if (sock->type != SOCK_SEQPACKET)
goto out;
rc = -EINVAL;
if (protocol)
goto out;
rc = -ENOBUFS;
if ((sk = x25_alloc_socket(net)) == NULL)
goto out;
x25 = x25_sk(sk);
sock_init_data(sock, sk);
x25_init_timers(sk);
sock->ops = &x25_proto_ops;
sk->sk_protocol = protocol;
sk->sk_backlog_rcv = x25_backlog_rcv;
x25->t21 = sysctl_x25_call_request_timeout;
x25->t22 = sysctl_x25_reset_request_timeout;
x25->t23 = sysctl_x25_clear_request_timeout;
x25->t2 = sysctl_x25_ack_holdback_timeout;
x25->state = X25_STATE_0;
x25->cudmatchlength = 0;
set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
/* on call accept */
x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
x25->facilities.throughput = 0; /* by default don't negotiate
throughput */
x25->facilities.reverse = X25_DEFAULT_REVERSE;
x25->dte_facilities.calling_len = 0;
x25->dte_facilities.called_len = 0;
memset(x25->dte_facilities.called_ae, '\0',
sizeof(x25->dte_facilities.called_ae));
memset(x25->dte_facilities.calling_ae, '\0',
sizeof(x25->dte_facilities.calling_ae));
rc = 0;
out:
return rc;
}
static struct sock *x25_make_new(struct sock *osk)
{
struct sock *sk = NULL;
struct x25_sock *x25, *ox25;
if (osk->sk_type != SOCK_SEQPACKET)
goto out;
if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
goto out;
x25 = x25_sk(sk);
sk->sk_type = osk->sk_type;
sk->sk_priority = osk->sk_priority;
sk->sk_protocol = osk->sk_protocol;
sk->sk_rcvbuf = osk->sk_rcvbuf;
sk->sk_sndbuf = osk->sk_sndbuf;
sk->sk_state = TCP_ESTABLISHED;
sk->sk_backlog_rcv = osk->sk_backlog_rcv;
sock_copy_flags(sk, osk);
ox25 = x25_sk(osk);
x25->t21 = ox25->t21;
x25->t22 = ox25->t22;
x25->t23 = ox25->t23;
x25->t2 = ox25->t2;
x25->flags = ox25->flags;
x25->facilities = ox25->facilities;
x25->dte_facilities = ox25->dte_facilities;
x25->cudmatchlength = ox25->cudmatchlength;
clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
x25_init_timers(sk);
out:
return sk;
}
static int x25_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct x25_sock *x25;
if (!sk)
return 0;
x25 = x25_sk(sk);
sock_hold(sk);
lock_sock(sk);
switch (x25->state) {
case X25_STATE_0:
case X25_STATE_2:
x25_disconnect(sk, 0, 0, 0);
__x25_destroy_socket(sk);
goto out;
case X25_STATE_1:
case X25_STATE_3:
case X25_STATE_4:
x25_clear_queues(sk);
x25_write_internal(sk, X25_CLEAR_REQUEST);
x25_start_t23timer(sk);
x25->state = X25_STATE_2;
sk->sk_state = TCP_CLOSE;
sk->sk_shutdown |= SEND_SHUTDOWN;
sk->sk_state_change(sk);
sock_set_flag(sk, SOCK_DEAD);
sock_set_flag(sk, SOCK_DESTROY);
break;
}
sock_orphan(sk);
out:
release_sock(sk);
sock_put(sk);
return 0;
}
static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
struct sock *sk = sock->sk;
struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
int len, i, rc = 0;
if (!sock_flag(sk, SOCK_ZAPPED) ||
addr_len != sizeof(struct sockaddr_x25) ||
addr->sx25_family != AF_X25) {
rc = -EINVAL;
goto out;
}
len = strlen(addr->sx25_addr.x25_addr);
for (i = 0; i < len; i++) {
if (!isdigit(addr->sx25_addr.x25_addr[i])) {
rc = -EINVAL;
goto out;
}
}
lock_sock(sk);
x25_sk(sk)->source_addr = addr->sx25_addr;
x25_insert_socket(sk);
sock_reset_flag(sk, SOCK_ZAPPED);
release_sock(sk);
SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
out:
return rc;
}
static int x25_wait_for_connection_establishment(struct sock *sk)
{
DECLARE_WAITQUEUE(wait, current);
int rc;
add_wait_queue_exclusive(sk_sleep(sk), &wait);
for (;;) {
__set_current_state(TASK_INTERRUPTIBLE);
rc = -ERESTARTSYS;
if (signal_pending(current))
break;
rc = sock_error(sk);
if (rc) {
sk->sk_socket->state = SS_UNCONNECTED;
break;
}
rc = 0;
if (sk->sk_state != TCP_ESTABLISHED) {
release_sock(sk);
schedule();
lock_sock(sk);
} else
break;
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(sk_sleep(sk), &wait);
return rc;
}
static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
int addr_len, int flags)
{
struct sock *sk = sock->sk;
struct x25_sock *x25 = x25_sk(sk);
struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
struct x25_route *rt;
int rc = 0;
lock_sock(sk);
if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
sock->state = SS_CONNECTED;
goto out; /* Connect completed during a ERESTARTSYS event */
}
rc = -ECONNREFUSED;
if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
sock->state = SS_UNCONNECTED;
goto out;
}
rc = -EISCONN; /* No reconnect on a seqpacket socket */
if (sk->sk_state == TCP_ESTABLISHED)
goto out;
sk->sk_state = TCP_CLOSE;
sock->state = SS_UNCONNECTED;
rc = -EINVAL;
if (addr_len != sizeof(struct sockaddr_x25) ||
addr->sx25_family != AF_X25)
goto out;
rc = -ENETUNREACH;
rt = x25_get_route(&addr->sx25_addr);
if (!rt)
goto out;
x25->neighbour = x25_get_neigh(rt->dev);
if (!x25->neighbour)
goto out_put_route;
x25_limit_facilities(&x25->facilities, x25->neighbour);
x25->lci = x25_new_lci(x25->neighbour);
if (!x25->lci)
goto out_put_neigh;
rc = -EINVAL;
if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
goto out_put_neigh;
if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
memset(&x25->source_addr, '\0', X25_ADDR_LEN);
x25->dest_addr = addr->sx25_addr;
/* Move to connecting socket, start sending Connect Requests */
sock->state = SS_CONNECTING;
sk->sk_state = TCP_SYN_SENT;
x25->state = X25_STATE_1;
x25_write_internal(sk, X25_CALL_REQUEST);
x25_start_heartbeat(sk);
x25_start_t21timer(sk);
/* Now the loop */
rc = -EINPROGRESS;
if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
goto out_put_neigh;
rc = x25_wait_for_connection_establishment(sk);
if (rc)
goto out_put_neigh;
sock->state = SS_CONNECTED;
rc = 0;
out_put_neigh:
if (rc)
x25_neigh_put(x25->neighbour);
out_put_route:
x25_route_put(rt);
out:
release_sock(sk);
return rc;
}
static int x25_wait_for_data(struct sock *sk, long timeout)
{
DECLARE_WAITQUEUE(wait, current);
int rc = 0;
add_wait_queue_exclusive(sk_sleep(sk), &wait);
for (;;) {
__set_current_state(TASK_INTERRUPTIBLE);
if (sk->sk_shutdown & RCV_SHUTDOWN)
break;
rc = -ERESTARTSYS;
if (signal_pending(current))
break;
rc = -EAGAIN;
if (!timeout)
break;
rc = 0;
if (skb_queue_empty(&sk->sk_receive_queue)) {
release_sock(sk);
timeout = schedule_timeout(timeout);
lock_sock(sk);
} else
break;
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(sk_sleep(sk), &wait);
return rc;
}
static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
{
struct sock *sk = sock->sk;
struct sock *newsk;
struct sk_buff *skb;
int rc = -EINVAL;
if (!sk)
goto out;
rc = -EOPNOTSUPP;
if (sk->sk_type != SOCK_SEQPACKET)
goto out;
lock_sock(sk);
rc = -EINVAL;
if (sk->sk_state != TCP_LISTEN)
goto out2;
rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
if (rc)
goto out2;
skb = skb_dequeue(&sk->sk_receive_queue);
rc = -EINVAL;
if (!skb->sk)
goto out2;
newsk = skb->sk;
sock_graft(newsk, newsock);
/* Now attach up the new socket */
skb->sk = NULL;
kfree_skb(skb);
sk->sk_ack_backlog--;
newsock->state = SS_CONNECTED;
rc = 0;
out2:
release_sock(sk);
out:
return rc;
}
static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
int *uaddr_len, int peer)
{
struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
struct sock *sk = sock->sk;
struct x25_sock *x25 = x25_sk(sk);
int rc = 0;
if (peer) {
if (sk->sk_state != TCP_ESTABLISHED) {
rc = -ENOTCONN;
goto out;
}
sx25->sx25_addr = x25->dest_addr;
} else
sx25->sx25_addr = x25->source_addr;
sx25->sx25_family = AF_X25;
*uaddr_len = sizeof(*sx25);
out:
return rc;
}
int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
unsigned int lci)
{
struct sock *sk;
struct sock *make;
struct x25_sock *makex25;
struct x25_address source_addr, dest_addr;
struct x25_facilities facilities;
struct x25_dte_facilities dte_facilities;
int len, addr_len, rc;
/*
* Remove the LCI and frame type.
*/
skb_pull(skb, X25_STD_MIN_LEN);
/*
* Extract the X.25 addresses and convert them to ASCII strings,
* and remove them.
*
* Address block is mandatory in call request packets
*/
addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
if (addr_len <= 0)
goto out_clear_request;
skb_pull(skb, addr_len);
/*
* Get the length of the facilities, skip past them for the moment
* get the call user data because this is needed to determine
* the correct listener
*
* Facilities length is mandatory in call request packets
*/
if (skb->len < 1)
goto out_clear_request;
len = skb->data[0] + 1;
if (skb->len < len)
goto out_clear_request;
skb_pull(skb,len);
/*
* Find a listener for the particular address/cud pair.
*/
sk = x25_find_listener(&source_addr,skb);
skb_push(skb,len);
if (sk != NULL && sk_acceptq_is_full(sk)) {
goto out_sock_put;
}
/*
* We dont have any listeners for this incoming call.
* Try forwarding it.
*/
if (sk == NULL) {
skb_push(skb, addr_len + X25_STD_MIN_LEN);
if (sysctl_x25_forward &&
x25_forward_call(&dest_addr, nb, skb, lci) > 0)
{
/* Call was forwarded, dont process it any more */
kfree_skb(skb);
rc = 1;
goto out;
} else {
/* No listeners, can't forward, clear the call */
goto out_clear_request;
}
}
/*
* Try to reach a compromise on the requested facilities.
*/
len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
if (len == -1)
goto out_sock_put;
/*
* current neighbour/link might impose additional limits
* on certain facilties
*/