forked from analogdevicesinc/linux
-
Notifications
You must be signed in to change notification settings - Fork 3
/
l1oip_core.c
1529 lines (1343 loc) · 39.6 KB
/
l1oip_core.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
/*
* l1oip.c low level driver for tunneling layer 1 over IP
*
* NOTE: It is not compatible with TDMoIP nor "ISDN over IP".
*
* Author Andreas Eversberg ([email protected])
*
* This program 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, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/* module parameters:
* type:
Value 1 = BRI
Value 2 = PRI
Value 3 = BRI (multi channel frame, not supported yet)
Value 4 = PRI (multi channel frame, not supported yet)
A multi channel frame reduces overhead to a single frame for all
b-channels, but increases delay.
(NOTE: Multi channel frames are not implemented yet.)
* codec:
Value 0 = transparent (default)
Value 1 = transfer ALAW
Value 2 = transfer ULAW
Value 3 = transfer generic 4 bit compression.
* ulaw:
0 = we use a-Law (default)
1 = we use u-Law
* limit:
limitation of B-channels to control bandwidth (1...126)
BRI: 1 or 2
PRI: 1-30, 31-126 (126, because dchannel ist not counted here)
Also limited ressources are used for stack, resulting in less channels.
It is possible to have more channels than 30 in PRI mode, this must
be supported by the application.
* ip:
byte representation of remote ip address (127.0.0.1 -> 127,0,0,1)
If not given or four 0, no remote address is set.
For multiple interfaces, concat ip addresses. (127,0,0,1,127,0,0,1)
* port:
port number (local interface)
If not given or 0, port 931 is used for fist instance, 932 for next...
For multiple interfaces, different ports must be given.
* remoteport:
port number (remote interface)
If not given or 0, remote port equals local port
For multiple interfaces on equal sites, different ports must be given.
* ondemand:
0 = fixed (always transmit packets, even when remote side timed out)
1 = on demand (only transmit packets, when remote side is detected)
the default is 0
NOTE: ID must also be set for on demand.
* id:
optional value to identify frames. This value must be equal on both
peers and should be random. If omitted or 0, no ID is transmitted.
* debug:
NOTE: only one debug value must be given for all cards
enable debugging (see l1oip.h for debug options)
Special mISDN controls:
op = MISDN_CTRL_SETPEER*
p1 = bytes 0-3 : remote IP address in network order (left element first)
p2 = bytes 1-2 : remote port in network order (high byte first)
optional:
p2 = bytes 3-4 : local port in network order (high byte first)
op = MISDN_CTRL_UNSETPEER*
* Use l1oipctrl for comfortable setting or removing ip address.
(Layer 1 Over IP CTRL)
L1oIP-Protocol
--------------
Frame Header:
7 6 5 4 3 2 1 0
+---------------+
|Ver|T|I|Coding |
+---------------+
| ID byte 3 * |
+---------------+
| ID byte 2 * |
+---------------+
| ID byte 1 * |
+---------------+
| ID byte 0 * |
+---------------+
|M| Channel |
+---------------+
| Length * |
+---------------+
| Time Base MSB |
+---------------+
| Time Base LSB |
+---------------+
| Data.... |
...
| |
+---------------+
|M| Channel |
+---------------+
| Length * |
+---------------+
| Time Base MSB |
+---------------+
| Time Base LSB |
+---------------+
| Data.... |
...
* Only included in some cases.
- Ver = Version
If version is missmatch, the frame must be ignored.
- T = Type of interface
Must be 0 for S0 or 1 for E1.
- I = Id present
If bit is set, four ID bytes are included in frame.
- ID = Connection ID
Additional ID to prevent Denial of Service attacs. Also it prevents hijacking
connections with dynamic IP. The ID should be random and must not be 0.
- Coding = Type of codec
Must be 0 for no transcoding. Also for D-channel and other HDLC frames.
1 and 2 are reserved for explicitly use of a-LAW or u-LAW codec.
3 is used for generic table compressor.
- M = More channels to come. If this flag is 1, the following byte contains
the length of the channel data. After the data block, the next channel will
be defined. The flag for the last channel block (or if only one channel is
transmitted), must be 0 and no length is given.
- Channel = Channel number
0 reserved
1-3 channel data for S0 (3 is D-channel)
1-31 channel data for E1 (16 is D-channel)
32-127 channel data for extended E1 (16 is D-channel)
- The length is used if the M-flag is 1. It is used to find the next channel
inside frame.
NOTE: A value of 0 equals 256 bytes of data.
-> For larger data blocks, a single frame must be used.
-> For larger streams, a single frame or multiple blocks with same channel ID
must be used.
- Time Base = Timestamp of first sample in frame
The "Time Base" is used to rearange packets and to detect packet loss.
The 16 bits are sent in network order (MSB first) and count 1/8000 th of a
second. This causes a wrap around each 8,192 seconds. There is no requirement
for the initial "Time Base", but 0 should be used for the first packet.
In case of HDLC data, this timestamp counts the packet or byte number.
Two Timers:
After initialisation, a timer of 15 seconds is started. Whenever a packet is
transmitted, the timer is reset to 15 seconds again. If the timer expires, an
empty packet is transmitted. This keep the connection alive.
When a valid packet is received, a timer 65 seconds is started. The interface
become ACTIVE. If the timer expires, the interface becomes INACTIVE.
Dynamic IP handling:
To allow dynamic IP, the ID must be non 0. In this case, any packet with the
correct port number and ID will be accepted. If the remote side changes its IP
the new IP is used for all transmitted packets until it changes again.
On Demand:
If the ondemand parameter is given, the remote IP is set to 0 on timeout.
This will stop keepalive traffic to remote. If the remote is online again,
traffic will continue to the remote address. This is useful for road warriors.
This feature only works with ID set, otherwhise it is highly unsecure.
Socket and Thread
-----------------
The complete socket opening and closing is done by a thread.
When the thread opened a socket, the hc->socket descriptor is set. Whenever a
packet shall be sent to the socket, the hc->socket must be checked wheter not
NULL. To prevent change in socket descriptor, the hc->socket_lock must be used.
To change the socket, a recall of l1oip_socket_open() will safely kill the
socket process and create a new one.
*/
#define L1OIP_VERSION 0 /* 0...3 */
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/mISDNif.h>
#include <linux/mISDNhw.h>
#include <linux/mISDNdsp.h>
#include <linux/init.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/workqueue.h>
#include <linux/kthread.h>
#include <linux/slab.h>
#include <net/sock.h>
#include "core.h"
#include "l1oip.h"
static const char *l1oip_revision = "2.00";
static int l1oip_cnt;
static spinlock_t l1oip_lock;
static struct list_head l1oip_ilist;
#define MAX_CARDS 16
static u_int type[MAX_CARDS];
static u_int codec[MAX_CARDS];
static u_int ip[MAX_CARDS * 4];
static u_int port[MAX_CARDS];
static u_int remoteport[MAX_CARDS];
static u_int ondemand[MAX_CARDS];
static u_int limit[MAX_CARDS];
static u_int id[MAX_CARDS];
static int debug;
static int ulaw;
MODULE_AUTHOR("Andreas Eversberg");
MODULE_LICENSE("GPL");
module_param_array(type, uint, NULL, S_IRUGO | S_IWUSR);
module_param_array(codec, uint, NULL, S_IRUGO | S_IWUSR);
module_param_array(ip, uint, NULL, S_IRUGO | S_IWUSR);
module_param_array(port, uint, NULL, S_IRUGO | S_IWUSR);
module_param_array(remoteport, uint, NULL, S_IRUGO | S_IWUSR);
module_param_array(ondemand, uint, NULL, S_IRUGO | S_IWUSR);
module_param_array(limit, uint, NULL, S_IRUGO | S_IWUSR);
module_param_array(id, uint, NULL, S_IRUGO | S_IWUSR);
module_param(ulaw, uint, S_IRUGO | S_IWUSR);
module_param(debug, uint, S_IRUGO | S_IWUSR);
/*
* send a frame via socket, if open and restart timer
*/
static int
l1oip_socket_send(struct l1oip *hc, u8 localcodec, u8 channel, u32 chanmask,
u16 timebase, u8 *buf, int len)
{
u8 *p;
u8 frame[len + 32];
struct socket *socket = NULL;
if (debug & DEBUG_L1OIP_MSG)
printk(KERN_DEBUG "%s: sending data to socket (len = %d)\n",
__func__, len);
p = frame;
/* restart timer */
if ((int)(hc->keep_tl.expires-jiffies) < 5 * HZ) {
del_timer(&hc->keep_tl);
hc->keep_tl.expires = jiffies + L1OIP_KEEPALIVE * HZ;
add_timer(&hc->keep_tl);
} else
hc->keep_tl.expires = jiffies + L1OIP_KEEPALIVE * HZ;
if (debug & DEBUG_L1OIP_MSG)
printk(KERN_DEBUG "%s: resetting timer\n", __func__);
/* drop if we have no remote ip or port */
if (!hc->sin_remote.sin_addr.s_addr || !hc->sin_remote.sin_port) {
if (debug & DEBUG_L1OIP_MSG)
printk(KERN_DEBUG "%s: dropping frame, because remote "
"IP is not set.\n", __func__);
return len;
}
/* assemble frame */
*p++ = (L1OIP_VERSION << 6) /* version and coding */
| (hc->pri ? 0x20 : 0x00) /* type */
| (hc->id ? 0x10 : 0x00) /* id */
| localcodec;
if (hc->id) {
*p++ = hc->id >> 24; /* id */
*p++ = hc->id >> 16;
*p++ = hc->id >> 8;
*p++ = hc->id;
}
*p++ = 0x00 + channel; /* m-flag, channel */
*p++ = timebase >> 8; /* time base */
*p++ = timebase;
if (buf && len) { /* add data to frame */
if (localcodec == 1 && ulaw)
l1oip_ulaw_to_alaw(buf, len, p);
else if (localcodec == 2 && !ulaw)
l1oip_alaw_to_ulaw(buf, len, p);
else if (localcodec == 3)
len = l1oip_law_to_4bit(buf, len, p,
&hc->chan[channel].codecstate);
else
memcpy(p, buf, len);
}
len += p - frame;
/* check for socket in safe condition */
spin_lock(&hc->socket_lock);
if (!hc->socket) {
spin_unlock(&hc->socket_lock);
return 0;
}
/* seize socket */
socket = hc->socket;
hc->socket = NULL;
spin_unlock(&hc->socket_lock);
/* send packet */
if (debug & DEBUG_L1OIP_MSG)
printk(KERN_DEBUG "%s: sending packet to socket (len "
"= %d)\n", __func__, len);
hc->sendiov.iov_base = frame;
hc->sendiov.iov_len = len;
len = kernel_sendmsg(socket, &hc->sendmsg, &hc->sendiov, 1, len);
/* give socket back */
hc->socket = socket; /* no locking required */
return len;
}
/*
* receive channel data from socket
*/
static void
l1oip_socket_recv(struct l1oip *hc, u8 remotecodec, u8 channel, u16 timebase,
u8 *buf, int len)
{
struct sk_buff *nskb;
struct bchannel *bch;
struct dchannel *dch;
u8 *p;
u32 rx_counter;
if (len == 0) {
if (debug & DEBUG_L1OIP_MSG)
printk(KERN_DEBUG "%s: received empty keepalive data, "
"ignoring\n", __func__);
return;
}
if (debug & DEBUG_L1OIP_MSG)
printk(KERN_DEBUG "%s: received data, sending to mISDN (%d)\n",
__func__, len);
if (channel < 1 || channel > 127) {
printk(KERN_WARNING "%s: packet error - channel %d out of "
"range\n", __func__, channel);
return;
}
dch = hc->chan[channel].dch;
bch = hc->chan[channel].bch;
if (!dch && !bch) {
printk(KERN_WARNING "%s: packet error - channel %d not in "
"stack\n", __func__, channel);
return;
}
/* prepare message */
nskb = mI_alloc_skb((remotecodec == 3) ? (len << 1) : len, GFP_ATOMIC);
if (!nskb) {
printk(KERN_ERR "%s: No mem for skb.\n", __func__);
return;
}
p = skb_put(nskb, (remotecodec == 3) ? (len << 1) : len);
if (remotecodec == 1 && ulaw)
l1oip_alaw_to_ulaw(buf, len, p);
else if (remotecodec == 2 && !ulaw)
l1oip_ulaw_to_alaw(buf, len, p);
else if (remotecodec == 3)
len = l1oip_4bit_to_law(buf, len, p);
else
memcpy(p, buf, len);
/* send message up */
if (dch && len >= 2) {
dch->rx_skb = nskb;
recv_Dchannel(dch);
}
if (bch) {
/* expand 16 bit sequence number to 32 bit sequence number */
rx_counter = hc->chan[channel].rx_counter;
if (((s16)(timebase - rx_counter)) >= 0) {
/* time has changed forward */
if (timebase >= (rx_counter & 0xffff))
rx_counter =
(rx_counter & 0xffff0000) | timebase;
else
rx_counter = ((rx_counter & 0xffff0000) + 0x10000)
| timebase;
} else {
/* time has changed backwards */
if (timebase < (rx_counter & 0xffff))
rx_counter =
(rx_counter & 0xffff0000) | timebase;
else
rx_counter = ((rx_counter & 0xffff0000) - 0x10000)
| timebase;
}
hc->chan[channel].rx_counter = rx_counter;
#ifdef REORDER_DEBUG
if (hc->chan[channel].disorder_flag) {
struct sk_buff *skb;
int cnt;
skb = hc->chan[channel].disorder_skb;
hc->chan[channel].disorder_skb = nskb;
nskb = skb;
cnt = hc->chan[channel].disorder_cnt;
hc->chan[channel].disorder_cnt = rx_counter;
rx_counter = cnt;
}
hc->chan[channel].disorder_flag ^= 1;
if (nskb)
#endif
queue_ch_frame(&bch->ch, PH_DATA_IND, rx_counter, nskb);
}
}
/*
* parse frame and extract channel data
*/
static void
l1oip_socket_parse(struct l1oip *hc, struct sockaddr_in *sin, u8 *buf, int len)
{
u32 packet_id;
u8 channel;
u8 remotecodec;
u16 timebase;
int m, mlen;
int len_start = len; /* initial frame length */
struct dchannel *dch = hc->chan[hc->d_idx].dch;
if (debug & DEBUG_L1OIP_MSG)
printk(KERN_DEBUG "%s: received frame, parsing... (%d)\n",
__func__, len);
/* check length */
if (len < 1 + 1 + 2) {
printk(KERN_WARNING "%s: packet error - length %d below "
"4 bytes\n", __func__, len);
return;
}
/* check version */
if (((*buf) >> 6) != L1OIP_VERSION) {
printk(KERN_WARNING "%s: packet error - unknown version %d\n",
__func__, buf[0]>>6);
return;
}
/* check type */
if (((*buf) & 0x20) && !hc->pri) {
printk(KERN_WARNING "%s: packet error - received E1 packet "
"on S0 interface\n", __func__);
return;
}
if (!((*buf) & 0x20) && hc->pri) {
printk(KERN_WARNING "%s: packet error - received S0 packet "
"on E1 interface\n", __func__);
return;
}
/* get id flag */
packet_id = (*buf >> 4) & 1;
/* check coding */
remotecodec = (*buf) & 0x0f;
if (remotecodec > 3) {
printk(KERN_WARNING "%s: packet error - remotecodec %d "
"unsupported\n", __func__, remotecodec);
return;
}
buf++;
len--;
/* check packet_id */
if (packet_id) {
if (!hc->id) {
printk(KERN_WARNING "%s: packet error - packet has id "
"0x%x, but we have not\n", __func__, packet_id);
return;
}
if (len < 4) {
printk(KERN_WARNING "%s: packet error - packet too "
"short for ID value\n", __func__);
return;
}
packet_id = (*buf++) << 24;
packet_id += (*buf++) << 16;
packet_id += (*buf++) << 8;
packet_id += (*buf++);
len -= 4;
if (packet_id != hc->id) {
printk(KERN_WARNING "%s: packet error - ID mismatch, "
"got 0x%x, we 0x%x\n",
__func__, packet_id, hc->id);
return;
}
} else {
if (hc->id) {
printk(KERN_WARNING "%s: packet error - packet has no "
"ID, but we have\n", __func__);
return;
}
}
multiframe:
if (len < 1) {
printk(KERN_WARNING "%s: packet error - packet too short, "
"channel expected at position %d.\n",
__func__, len-len_start + 1);
return;
}
/* get channel and multiframe flag */
channel = *buf & 0x7f;
m = *buf >> 7;
buf++;
len--;
/* check length on multiframe */
if (m) {
if (len < 1) {
printk(KERN_WARNING "%s: packet error - packet too "
"short, length expected at position %d.\n",
__func__, len_start - len - 1);
return;
}
mlen = *buf++;
len--;
if (mlen == 0)
mlen = 256;
if (len < mlen + 3) {
printk(KERN_WARNING "%s: packet error - length %d at "
"position %d exceeds total length %d.\n",
__func__, mlen, len_start-len - 1, len_start);
return;
}
if (len == mlen + 3) {
printk(KERN_WARNING "%s: packet error - length %d at "
"position %d will not allow additional "
"packet.\n",
__func__, mlen, len_start-len + 1);
return;
}
} else
mlen = len - 2; /* single frame, subtract timebase */
if (len < 2) {
printk(KERN_WARNING "%s: packet error - packet too short, time "
"base expected at position %d.\n",
__func__, len-len_start + 1);
return;
}
/* get time base */
timebase = (*buf++) << 8;
timebase |= (*buf++);
len -= 2;
/* if inactive, we send up a PH_ACTIVATE and activate */
if (!test_bit(FLG_ACTIVE, &dch->Flags)) {
if (debug & (DEBUG_L1OIP_MSG | DEBUG_L1OIP_SOCKET))
printk(KERN_DEBUG "%s: interface become active due to "
"received packet\n", __func__);
test_and_set_bit(FLG_ACTIVE, &dch->Flags);
_queue_data(&dch->dev.D, PH_ACTIVATE_IND, MISDN_ID_ANY, 0,
NULL, GFP_ATOMIC);
}
/* distribute packet */
l1oip_socket_recv(hc, remotecodec, channel, timebase, buf, mlen);
buf += mlen;
len -= mlen;
/* multiframe */
if (m)
goto multiframe;
/* restart timer */
if ((int)(hc->timeout_tl.expires-jiffies) < 5 * HZ || !hc->timeout_on) {
hc->timeout_on = 1;
del_timer(&hc->timeout_tl);
hc->timeout_tl.expires = jiffies + L1OIP_TIMEOUT * HZ;
add_timer(&hc->timeout_tl);
} else /* only adjust timer */
hc->timeout_tl.expires = jiffies + L1OIP_TIMEOUT * HZ;
/* if ip or source port changes */
if ((hc->sin_remote.sin_addr.s_addr != sin->sin_addr.s_addr)
|| (hc->sin_remote.sin_port != sin->sin_port)) {
if (debug & DEBUG_L1OIP_SOCKET)
printk(KERN_DEBUG "%s: remote address changes from "
"0x%08x to 0x%08x (port %d to %d)\n", __func__,
ntohl(hc->sin_remote.sin_addr.s_addr),
ntohl(sin->sin_addr.s_addr),
ntohs(hc->sin_remote.sin_port),
ntohs(sin->sin_port));
hc->sin_remote.sin_addr.s_addr = sin->sin_addr.s_addr;
hc->sin_remote.sin_port = sin->sin_port;
}
}
/*
* socket stuff
*/
static int
l1oip_socket_thread(void *data)
{
struct l1oip *hc = (struct l1oip *)data;
int ret = 0;
struct msghdr msg;
struct sockaddr_in sin_rx;
unsigned char *recvbuf;
size_t recvbuf_size = 1500;
int recvlen;
struct socket *socket = NULL;
DECLARE_COMPLETION_ONSTACK(wait);
/* allocate buffer memory */
recvbuf = kmalloc(recvbuf_size, GFP_KERNEL);
if (!recvbuf) {
printk(KERN_ERR "%s: Failed to alloc recvbuf.\n", __func__);
ret = -ENOMEM;
goto fail;
}
/* make daemon */
allow_signal(SIGTERM);
/* create socket */
if (sock_create(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &socket)) {
printk(KERN_ERR "%s: Failed to create socket.\n", __func__);
ret = -EIO;
goto fail;
}
/* set incoming address */
hc->sin_local.sin_family = AF_INET;
hc->sin_local.sin_addr.s_addr = INADDR_ANY;
hc->sin_local.sin_port = htons((unsigned short)hc->localport);
/* set outgoing address */
hc->sin_remote.sin_family = AF_INET;
hc->sin_remote.sin_addr.s_addr = htonl(hc->remoteip);
hc->sin_remote.sin_port = htons((unsigned short)hc->remoteport);
/* bind to incoming port */
if (socket->ops->bind(socket, (struct sockaddr *)&hc->sin_local,
sizeof(hc->sin_local))) {
printk(KERN_ERR "%s: Failed to bind socket to port %d.\n",
__func__, hc->localport);
ret = -EINVAL;
goto fail;
}
/* check sk */
if (socket->sk == NULL) {
printk(KERN_ERR "%s: socket->sk == NULL\n", __func__);
ret = -EIO;
goto fail;
}
/* build receive message */
msg.msg_name = &sin_rx;
msg.msg_namelen = sizeof(sin_rx);
msg.msg_control = NULL;
msg.msg_controllen = 0;
/* build send message */
hc->sendmsg.msg_name = &hc->sin_remote;
hc->sendmsg.msg_namelen = sizeof(hc->sin_remote);
hc->sendmsg.msg_control = NULL;
hc->sendmsg.msg_controllen = 0;
/* give away socket */
spin_lock(&hc->socket_lock);
hc->socket = socket;
spin_unlock(&hc->socket_lock);
/* read loop */
if (debug & DEBUG_L1OIP_SOCKET)
printk(KERN_DEBUG "%s: socket created and open\n",
__func__);
while (!signal_pending(current)) {
struct kvec iov = {
.iov_base = recvbuf,
.iov_len = recvbuf_size,
};
recvlen = kernel_recvmsg(socket, &msg, &iov, 1,
recvbuf_size, 0);
if (recvlen > 0) {
l1oip_socket_parse(hc, &sin_rx, recvbuf, recvlen);
} else {
if (debug & DEBUG_L1OIP_SOCKET)
printk(KERN_WARNING
"%s: broken pipe on socket\n", __func__);
}
}
/* get socket back, check first if in use, maybe by send function */
spin_lock(&hc->socket_lock);
/* if hc->socket is NULL, it is in use until it is given back */
while (!hc->socket) {
spin_unlock(&hc->socket_lock);
schedule_timeout(HZ / 10);
spin_lock(&hc->socket_lock);
}
hc->socket = NULL;
spin_unlock(&hc->socket_lock);
if (debug & DEBUG_L1OIP_SOCKET)
printk(KERN_DEBUG "%s: socket thread terminating\n",
__func__);
fail:
/* free recvbuf */
kfree(recvbuf);
/* close socket */
if (socket)
sock_release(socket);
/* if we got killed, signal completion */
complete(&hc->socket_complete);
hc->socket_thread = NULL; /* show termination of thread */
if (debug & DEBUG_L1OIP_SOCKET)
printk(KERN_DEBUG "%s: socket thread terminated\n",
__func__);
return ret;
}
static void
l1oip_socket_close(struct l1oip *hc)
{
struct dchannel *dch = hc->chan[hc->d_idx].dch;
/* kill thread */
if (hc->socket_thread) {
if (debug & DEBUG_L1OIP_SOCKET)
printk(KERN_DEBUG "%s: socket thread exists, "
"killing...\n", __func__);
send_sig(SIGTERM, hc->socket_thread, 0);
wait_for_completion(&hc->socket_complete);
}
/* if active, we send up a PH_DEACTIVATE and deactivate */
if (test_bit(FLG_ACTIVE, &dch->Flags)) {
if (debug & (DEBUG_L1OIP_MSG | DEBUG_L1OIP_SOCKET))
printk(KERN_DEBUG "%s: interface become deactivated "
"due to timeout\n", __func__);
test_and_clear_bit(FLG_ACTIVE, &dch->Flags);
_queue_data(&dch->dev.D, PH_DEACTIVATE_IND, MISDN_ID_ANY, 0,
NULL, GFP_ATOMIC);
}
}
static int
l1oip_socket_open(struct l1oip *hc)
{
/* in case of reopen, we need to close first */
l1oip_socket_close(hc);
init_completion(&hc->socket_complete);
/* create receive process */
hc->socket_thread = kthread_run(l1oip_socket_thread, hc, "l1oip_%s",
hc->name);
if (IS_ERR(hc->socket_thread)) {
int err = PTR_ERR(hc->socket_thread);
printk(KERN_ERR "%s: Failed (%d) to create socket process.\n",
__func__, err);
hc->socket_thread = NULL;
sock_release(hc->socket);
return err;
}
if (debug & DEBUG_L1OIP_SOCKET)
printk(KERN_DEBUG "%s: socket thread created\n", __func__);
return 0;
}
static void
l1oip_send_bh(struct work_struct *work)
{
struct l1oip *hc = container_of(work, struct l1oip, workq);
if (debug & (DEBUG_L1OIP_MSG | DEBUG_L1OIP_SOCKET))
printk(KERN_DEBUG "%s: keepalive timer expired, sending empty "
"frame on dchannel\n", __func__);
/* send an empty l1oip frame at D-channel */
l1oip_socket_send(hc, 0, hc->d_idx, 0, 0, NULL, 0);
}
/*
* timer stuff
*/
static void
l1oip_keepalive(void *data)
{
struct l1oip *hc = (struct l1oip *)data;
schedule_work(&hc->workq);
}
static void
l1oip_timeout(void *data)
{
struct l1oip *hc = (struct l1oip *)data;
struct dchannel *dch = hc->chan[hc->d_idx].dch;
if (debug & DEBUG_L1OIP_MSG)
printk(KERN_DEBUG "%s: timeout timer expired, turn layer one "
"down.\n", __func__);
hc->timeout_on = 0; /* state that timer must be initialized next time */
/* if timeout, we send up a PH_DEACTIVATE and deactivate */
if (test_bit(FLG_ACTIVE, &dch->Flags)) {
if (debug & (DEBUG_L1OIP_MSG | DEBUG_L1OIP_SOCKET))
printk(KERN_DEBUG "%s: interface become deactivated "
"due to timeout\n", __func__);
test_and_clear_bit(FLG_ACTIVE, &dch->Flags);
_queue_data(&dch->dev.D, PH_DEACTIVATE_IND, MISDN_ID_ANY, 0,
NULL, GFP_ATOMIC);
}
/* if we have ondemand set, we remove ip address */
if (hc->ondemand) {
if (debug & DEBUG_L1OIP_MSG)
printk(KERN_DEBUG "%s: on demand causes ip address to "
"be removed\n", __func__);
hc->sin_remote.sin_addr.s_addr = 0;
}
}
/*
* message handling
*/
static int
handle_dmsg(struct mISDNchannel *ch, struct sk_buff *skb)
{
struct mISDNdevice *dev = container_of(ch, struct mISDNdevice, D);
struct dchannel *dch = container_of(dev, struct dchannel, dev);
struct l1oip *hc = dch->hw;
struct mISDNhead *hh = mISDN_HEAD_P(skb);
int ret = -EINVAL;
int l, ll;
unsigned char *p;
switch (hh->prim) {
case PH_DATA_REQ:
if (skb->len < 1) {
printk(KERN_WARNING "%s: skb too small\n",
__func__);
break;
}
if (skb->len > MAX_DFRAME_LEN_L1 || skb->len > L1OIP_MAX_LEN) {
printk(KERN_WARNING "%s: skb too large\n",
__func__);
break;
}
/* send frame */
p = skb->data;
l = skb->len;
while (l) {
ll = (l < L1OIP_MAX_PERFRAME) ? l : L1OIP_MAX_PERFRAME;
l1oip_socket_send(hc, 0, dch->slot, 0,
hc->chan[dch->slot].tx_counter++, p, ll);
p += ll;
l -= ll;
}
skb_trim(skb, 0);
queue_ch_frame(ch, PH_DATA_CNF, hh->id, skb);
return 0;
case PH_ACTIVATE_REQ:
if (debug & (DEBUG_L1OIP_MSG | DEBUG_L1OIP_SOCKET))
printk(KERN_DEBUG "%s: PH_ACTIVATE channel %d (1..%d)\n"
, __func__, dch->slot, hc->b_num + 1);
skb_trim(skb, 0);
if (test_bit(FLG_ACTIVE, &dch->Flags))
queue_ch_frame(ch, PH_ACTIVATE_IND, hh->id, skb);
else
queue_ch_frame(ch, PH_DEACTIVATE_IND, hh->id, skb);
return 0;
case PH_DEACTIVATE_REQ:
if (debug & (DEBUG_L1OIP_MSG | DEBUG_L1OIP_SOCKET))
printk(KERN_DEBUG "%s: PH_DEACTIVATE channel %d "
"(1..%d)\n", __func__, dch->slot,
hc->b_num + 1);
skb_trim(skb, 0);
if (test_bit(FLG_ACTIVE, &dch->Flags))
queue_ch_frame(ch, PH_ACTIVATE_IND, hh->id, skb);
else
queue_ch_frame(ch, PH_DEACTIVATE_IND, hh->id, skb);
return 0;
}
if (!ret)
dev_kfree_skb(skb);
return ret;
}
static int
channel_dctrl(struct dchannel *dch, struct mISDN_ctrl_req *cq)
{
int ret = 0;
struct l1oip *hc = dch->hw;
switch (cq->op) {
case MISDN_CTRL_GETOP:
cq->op = MISDN_CTRL_SETPEER | MISDN_CTRL_UNSETPEER
| MISDN_CTRL_GETPEER;
break;
case MISDN_CTRL_SETPEER:
hc->remoteip = (u32)cq->p1;
hc->remoteport = cq->p2 & 0xffff;
hc->localport = cq->p2 >> 16;
if (!hc->remoteport)
hc->remoteport = hc->localport;
if (debug & DEBUG_L1OIP_SOCKET)
printk(KERN_DEBUG "%s: got new ip address from user "
"space.\n", __func__);
l1oip_socket_open(hc);
break;
case MISDN_CTRL_UNSETPEER:
if (debug & DEBUG_L1OIP_SOCKET)
printk(KERN_DEBUG "%s: removing ip address.\n",
__func__);
hc->remoteip = 0;
l1oip_socket_open(hc);
break;
case MISDN_CTRL_GETPEER:
if (debug & DEBUG_L1OIP_SOCKET)
printk(KERN_DEBUG "%s: getting ip address.\n",
__func__);
cq->p1 = hc->remoteip;
cq->p2 = hc->remoteport | (hc->localport << 16);
break;
default:
printk(KERN_WARNING "%s: unknown Op %x\n",
__func__, cq->op);
ret = -EINVAL;
break;
}
return ret;
}
static int
open_dchannel(struct l1oip *hc, struct dchannel *dch, struct channel_req *rq)
{
if (debug & DEBUG_HW_OPEN)