-
Notifications
You must be signed in to change notification settings - Fork 22
/
pcap-dag.c
1217 lines (1050 loc) · 31.9 KB
/
pcap-dag.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
/*
* pcap-dag.c: Packet capture interface for Endace DAG card.
*
* The functionality of this code attempts to mimic that of pcap-linux as much
* as possible. This code is compiled in several different ways depending on
* whether DAG_ONLY and HAVE_DAG_API are defined. If HAVE_DAG_API is not
* defined it should not get compiled in, otherwise if DAG_ONLY is defined then
* the 'dag_' function calls are renamed to 'pcap_' equivalents. If DAG_ONLY
* is not defined then nothing is altered - the dag_ functions will be
* called as required from their pcap-linux/bpf equivalents.
*
* Authors: Richard Littin, Sean Irvine ({richard,sean}@reeltwo.com)
* Modifications: Jesper Peterson <support@endace.com>
* Koryn Grant <support@endace.com>
* Stephen Donnelly <support@endace.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h> /* optionally get BSD define */
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "pcap-int.h"
#include <ctype.h>
#include <netinet/in.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
struct mbuf; /* Squelch compiler warnings on some platforms for */
struct rtentry; /* declarations in <net/if.h> */
#include <net/if.h>
#include "dagnew.h"
#include "dagapi.h"
#include "pcap-dag.h"
/*
* DAG devices have names beginning with "dag", followed by a number
* from 0 to DAG_MAX_BOARDS, then optionally a colon and a stream number
* from 0 to DAG_STREAM_MAX.
*/
#ifndef DAG_MAX_BOARDS
#define DAG_MAX_BOARDS 32
#endif
#define ATM_CELL_SIZE 52
#define ATM_HDR_SIZE 4
/*
* A header containing additional MTP information.
*/
#define MTP2_SENT_OFFSET 0 /* 1 byte */
#define MTP2_ANNEX_A_USED_OFFSET 1 /* 1 byte */
#define MTP2_LINK_NUMBER_OFFSET 2 /* 2 bytes */
#define MTP2_HDR_LEN 4 /* length of the header */
#define MTP2_ANNEX_A_NOT_USED 0
#define MTP2_ANNEX_A_USED 1
#define MTP2_ANNEX_A_USED_UNKNOWN 2
/* SunATM pseudo header */
struct sunatm_hdr {
unsigned char flags; /* destination and traffic type */
unsigned char vpi; /* VPI */
unsigned short vci; /* VCI */
};
/*
* Private data for capturing on DAG devices.
*/
struct pcap_dag {
struct pcap_stat stat;
#ifdef HAVE_DAG_STREAMS_API
u_char *dag_mem_bottom; /* DAG card current memory bottom pointer */
u_char *dag_mem_top; /* DAG card current memory top pointer */
#else /* HAVE_DAG_STREAMS_API */
void *dag_mem_base; /* DAG card memory base address */
u_int dag_mem_bottom; /* DAG card current memory bottom offset */
u_int dag_mem_top; /* DAG card current memory top offset */
#endif /* HAVE_DAG_STREAMS_API */
int dag_fcs_bits; /* Number of checksum bits from link layer */
int dag_offset_flags; /* Flags to pass to dag_offset(). */
int dag_stream; /* DAG stream number */
int dag_timeout; /* timeout specified to pcap_open_live.
* Same as in linux above, introduce
* generally? */
};
typedef struct pcap_dag_node {
struct pcap_dag_node *next;
pcap_t *p;
pid_t pid;
} pcap_dag_node_t;
static pcap_dag_node_t *pcap_dags = NULL;
static int atexit_handler_installed = 0;
static const unsigned short endian_test_word = 0x0100;
#define IS_BIGENDIAN() (*((unsigned char *)&endian_test_word))
#define MAX_DAG_PACKET 65536
static unsigned char TempPkt[MAX_DAG_PACKET];
static int dag_setfilter(pcap_t *p, struct bpf_program *fp);
static int dag_stats(pcap_t *p, struct pcap_stat *ps);
static int dag_set_datalink(pcap_t *p, int dlt);
static int dag_get_datalink(pcap_t *p);
static int dag_setnonblock(pcap_t *p, int nonblock, char *errbuf);
static void
delete_pcap_dag(pcap_t *p)
{
pcap_dag_node_t *curr = NULL, *prev = NULL;
for (prev = NULL, curr = pcap_dags; curr != NULL && curr->p != p; prev = curr, curr = curr->next) {
/* empty */
}
if (curr != NULL && curr->p == p) {
if (prev != NULL) {
prev->next = curr->next;
} else {
pcap_dags = curr->next;
}
}
}
/*
* Performs a graceful shutdown of the DAG card, frees dynamic memory held
* in the pcap_t structure, and closes the file descriptor for the DAG card.
*/
static void
dag_platform_cleanup(pcap_t *p)
{
struct pcap_dag *pd;
if (p != NULL) {
pd = p->priv;
#ifdef HAVE_DAG_STREAMS_API
if(dag_stop_stream(p->fd, pd->dag_stream) < 0)
fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno));
if(dag_detach_stream(p->fd, pd->dag_stream) < 0)
fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno));
#else
if(dag_stop(p->fd) < 0)
fprintf(stderr,"dag_stop: %s\n", strerror(errno));
#endif /* HAVE_DAG_STREAMS_API */
if(p->fd != -1) {
if(dag_close(p->fd) < 0)
fprintf(stderr,"dag_close: %s\n", strerror(errno));
p->fd = -1;
}
delete_pcap_dag(p);
pcap_cleanup_live_common(p);
}
/* Note: don't need to call close(p->fd) here as dag_close(p->fd) does this. */
}
static void
atexit_handler(void)
{
while (pcap_dags != NULL) {
if (pcap_dags->pid == getpid()) {
dag_platform_cleanup(pcap_dags->p);
} else {
delete_pcap_dag(pcap_dags->p);
}
}
}
static int
new_pcap_dag(pcap_t *p)
{
pcap_dag_node_t *node = NULL;
if ((node = malloc(sizeof(pcap_dag_node_t))) == NULL) {
return -1;
}
if (!atexit_handler_installed) {
atexit(atexit_handler);
atexit_handler_installed = 1;
}
node->next = pcap_dags;
node->p = p;
node->pid = getpid();
pcap_dags = node;
return 0;
}
static unsigned int
dag_erf_ext_header_count(uint8_t * erf, size_t len)
{
uint32_t hdr_num = 0;
uint8_t hdr_type;
/* basic sanity checks */
if ( erf == NULL )
return 0;
if ( len < 16 )
return 0;
/* check if we have any extension headers */
if ( (erf[8] & 0x80) == 0x00 )
return 0;
/* loop over the extension headers */
do {
/* sanity check we have enough bytes */
if ( len < (24 + (hdr_num * 8)) )
return hdr_num;
/* get the header type */
hdr_type = erf[(16 + (hdr_num * 8))];
hdr_num++;
} while ( hdr_type & 0x80 );
return hdr_num;
}
/*
* Read at most max_packets from the capture stream and call the callback
* for each of them. Returns the number of packets handled, -1 if an
* error occured, or -2 if we were told to break out of the loop.
*/
static int
dag_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{
struct pcap_dag *pd = p->priv;
unsigned int processed = 0;
int flags = pd->dag_offset_flags;
unsigned int nonblocking = flags & DAGF_NONBLOCK;
unsigned int num_ext_hdr = 0;
/* Get the next bufferful of packets (if necessary). */
while (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size) {
/*
* Has "pcap_breakloop()" been called?
*/
if (p->break_loop) {
/*
* Yes - clear the flag that indicates that
* it has, and return -2 to indicate that
* we were told to break out of the loop.
*/
p->break_loop = 0;
return -2;
}
#ifdef HAVE_DAG_STREAMS_API
/* dag_advance_stream() will block (unless nonblock is called)
* until 64kB of data has accumulated.
* If to_ms is set, it will timeout before 64kB has accumulated.
* We wait for 64kB because processing a few packets at a time
* can cause problems at high packet rates (>200kpps) due
* to inefficiencies.
* This does mean if to_ms is not specified the capture may 'hang'
* for long periods if the data rate is extremely slow (<64kB/sec)
* If non-block is specified it will return immediately. The user
* is then responsible for efficiency.
*/
if ( NULL == (pd->dag_mem_top = dag_advance_stream(p->fd, pd->dag_stream, &(pd->dag_mem_bottom))) ) {
return -1;
}
#else
/* dag_offset does not support timeouts */
pd->dag_mem_top = dag_offset(p->fd, &(pd->dag_mem_bottom), flags);
#endif /* HAVE_DAG_STREAMS_API */
if (nonblocking && (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size))
{
/* Pcap is configured to process only available packets, and there aren't any, return immediately. */
return 0;
}
if(!nonblocking &&
pd->dag_timeout &&
(pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size))
{
/* Blocking mode, but timeout set and no data has arrived, return anyway.*/
return 0;
}
}
/* Process the packets. */
while (pd->dag_mem_top - pd->dag_mem_bottom >= dag_record_size) {
unsigned short packet_len = 0;
int caplen = 0;
struct pcap_pkthdr pcap_header;
#ifdef HAVE_DAG_STREAMS_API
dag_record_t *header = (dag_record_t *)(pd->dag_mem_bottom);
#else
dag_record_t *header = (dag_record_t *)(pd->dag_mem_base + pd->dag_mem_bottom);
#endif /* HAVE_DAG_STREAMS_API */
u_char *dp = ((u_char *)header); /* + dag_record_size; */
unsigned short rlen;
/*
* Has "pcap_breakloop()" been called?
*/
if (p->break_loop) {
/*
* Yes - clear the flag that indicates that
* it has, and return -2 to indicate that
* we were told to break out of the loop.
*/
p->break_loop = 0;
return -2;
}
rlen = ntohs(header->rlen);
if (rlen < dag_record_size)
{
strncpy(p->errbuf, "dag_read: record too small", PCAP_ERRBUF_SIZE);
return -1;
}
pd->dag_mem_bottom += rlen;
/* Count lost packets. */
switch((header->type & 0x7f)) {
/* in these types the color value overwrites the lctr */
case TYPE_COLOR_HDLC_POS:
case TYPE_COLOR_ETH:
case TYPE_DSM_COLOR_HDLC_POS:
case TYPE_DSM_COLOR_ETH:
case TYPE_COLOR_MC_HDLC_POS:
case TYPE_COLOR_HASH_ETH:
case TYPE_COLOR_HASH_POS:
break;
default:
if (header->lctr) {
if (pd->stat.ps_drop > (UINT_MAX - ntohs(header->lctr))) {
pd->stat.ps_drop = UINT_MAX;
} else {
pd->stat.ps_drop += ntohs(header->lctr);
}
}
}
if ((header->type & 0x7f) == TYPE_PAD) {
continue;
}
num_ext_hdr = dag_erf_ext_header_count(dp, rlen);
/* ERF encapsulation */
/* The Extensible Record Format is not dropped for this kind of encapsulation,
* and will be handled as a pseudo header by the decoding application.
* The information carried in the ERF header and in the optional subheader (if present)
* could be merged with the libpcap information, to offer a better decoding.
* The packet length is
* o the length of the packet on the link (header->wlen),
* o plus the length of the ERF header (dag_record_size), as the length of the
* pseudo header will be adjusted during the decoding,
* o plus the length of the optional subheader (if present).
*
* The capture length is header.rlen and the byte stuffing for alignment will be dropped
* if the capture length is greater than the packet length.
*/
if (p->linktype == DLT_ERF) {
packet_len = ntohs(header->wlen) + dag_record_size;
caplen = rlen;
switch ((header->type & 0x7f)) {
case TYPE_MC_AAL5:
case TYPE_MC_ATM:
case TYPE_MC_HDLC:
case TYPE_MC_RAW_CHANNEL:
case TYPE_MC_RAW:
case TYPE_MC_AAL2:
case TYPE_COLOR_MC_HDLC_POS:
packet_len += 4; /* MC header */
break;
case TYPE_COLOR_HASH_ETH:
case TYPE_DSM_COLOR_ETH:
case TYPE_COLOR_ETH:
case TYPE_ETH:
packet_len += 2; /* ETH header */
break;
} /* switch type */
/* Include ERF extension headers */
packet_len += (8 * num_ext_hdr);
if (caplen > packet_len) {
caplen = packet_len;
}
} else {
/* Other kind of encapsulation according to the header Type */
/* Skip over generic ERF header */
dp += dag_record_size;
/* Skip over extension headers */
dp += 8 * num_ext_hdr;
switch((header->type & 0x7f)) {
case TYPE_ATM:
case TYPE_AAL5:
if (header->type == TYPE_AAL5) {
packet_len = ntohs(header->wlen);
caplen = rlen - dag_record_size;
}
case TYPE_MC_ATM:
if (header->type == TYPE_MC_ATM) {
caplen = packet_len = ATM_CELL_SIZE;
dp+=4;
}
case TYPE_MC_AAL5:
if (header->type == TYPE_MC_AAL5) {
packet_len = ntohs(header->wlen);
caplen = rlen - dag_record_size - 4;
dp+=4;
}
if (header->type == TYPE_ATM) {
caplen = packet_len = ATM_CELL_SIZE;
}
if (p->linktype == DLT_SUNATM) {
struct sunatm_hdr *sunatm = (struct sunatm_hdr *)dp;
unsigned long rawatm;
rawatm = ntohl(*((unsigned long *)dp));
sunatm->vci = htons((rawatm >> 4) & 0xffff);
sunatm->vpi = (rawatm >> 20) & 0x00ff;
sunatm->flags = ((header->flags.iface & 1) ? 0x80 : 0x00) |
((sunatm->vpi == 0 && sunatm->vci == htons(5)) ? 6 :
((sunatm->vpi == 0 && sunatm->vci == htons(16)) ? 5 :
((dp[ATM_HDR_SIZE] == 0xaa &&
dp[ATM_HDR_SIZE+1] == 0xaa &&
dp[ATM_HDR_SIZE+2] == 0x03) ? 2 : 1)));
} else {
packet_len -= ATM_HDR_SIZE;
caplen -= ATM_HDR_SIZE;
dp += ATM_HDR_SIZE;
}
break;
case TYPE_COLOR_HASH_ETH:
case TYPE_DSM_COLOR_ETH:
case TYPE_COLOR_ETH:
case TYPE_ETH:
packet_len = ntohs(header->wlen);
packet_len -= (pd->dag_fcs_bits >> 3);
caplen = rlen - dag_record_size - 2;
if (caplen > packet_len) {
caplen = packet_len;
}
dp += 2;
break;
case TYPE_COLOR_HASH_POS:
case TYPE_DSM_COLOR_HDLC_POS:
case TYPE_COLOR_HDLC_POS:
case TYPE_HDLC_POS:
packet_len = ntohs(header->wlen);
packet_len -= (pd->dag_fcs_bits >> 3);
caplen = rlen - dag_record_size;
if (caplen > packet_len) {
caplen = packet_len;
}
break;
case TYPE_COLOR_MC_HDLC_POS:
case TYPE_MC_HDLC:
packet_len = ntohs(header->wlen);
packet_len -= (pd->dag_fcs_bits >> 3);
caplen = rlen - dag_record_size - 4;
if (caplen > packet_len) {
caplen = packet_len;
}
/* jump the MC_HDLC_HEADER */
dp += 4;
#ifdef DLT_MTP2_WITH_PHDR
if (p->linktype == DLT_MTP2_WITH_PHDR) {
/* Add the MTP2 Pseudo Header */
caplen += MTP2_HDR_LEN;
packet_len += MTP2_HDR_LEN;
TempPkt[MTP2_SENT_OFFSET] = 0;
TempPkt[MTP2_ANNEX_A_USED_OFFSET] = MTP2_ANNEX_A_USED_UNKNOWN;
*(TempPkt+MTP2_LINK_NUMBER_OFFSET) = ((header->rec.mc_hdlc.mc_header>>16)&0x01);
*(TempPkt+MTP2_LINK_NUMBER_OFFSET+1) = ((header->rec.mc_hdlc.mc_header>>24)&0xff);
memcpy(TempPkt+MTP2_HDR_LEN, dp, caplen);
dp = TempPkt;
}
#endif
break;
case TYPE_IPV4:
case TYPE_IPV6:
packet_len = ntohs(header->wlen);
caplen = rlen - dag_record_size;
if (caplen > packet_len) {
caplen = packet_len;
}
break;
/* These types have no matching 'native' DLT, but can be used with DLT_ERF above */
case TYPE_MC_RAW:
case TYPE_MC_RAW_CHANNEL:
case TYPE_IP_COUNTER:
case TYPE_TCP_FLOW_COUNTER:
case TYPE_INFINIBAND:
case TYPE_RAW_LINK:
case TYPE_INFINIBAND_LINK:
default:
/* Unhandled ERF type.
* Ignore rather than generating error
*/
continue;
} /* switch type */
/* Skip over extension headers */
caplen -= (8 * num_ext_hdr);
} /* ERF encapsulation */
if (caplen > p->snapshot)
caplen = p->snapshot;
/* Run the packet filter if there is one. */
if ((p->fcode.bf_insns == NULL) || bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen)) {
/* convert between timestamp formats */
register unsigned long long ts;
if (IS_BIGENDIAN()) {
ts = SWAPLL(header->ts);
} else {
ts = header->ts;
}
pcap_header.ts.tv_sec = ts >> 32;
ts = (ts & 0xffffffffULL) * 1000000;
ts += 0x80000000; /* rounding */
pcap_header.ts.tv_usec = ts >> 32;
if (pcap_header.ts.tv_usec >= 1000000) {
pcap_header.ts.tv_usec -= 1000000;
pcap_header.ts.tv_sec++;
}
/* Fill in our own header data */
pcap_header.caplen = caplen;
pcap_header.len = packet_len;
/* Count the packet. */
pd->stat.ps_recv++;
/* Call the user supplied callback function */
callback(user, &pcap_header, dp);
/* Only count packets that pass the filter, for consistency with standard Linux behaviour. */
processed++;
if (processed == cnt && !PACKET_COUNT_IS_UNLIMITED(cnt))
{
/* Reached the user-specified limit. */
return cnt;
}
}
}
return processed;
}
static int
dag_inject(pcap_t *p, const void *buf _U_, size_t size _U_)
{
strlcpy(p->errbuf, "Sending packets isn't supported on DAG cards",
PCAP_ERRBUF_SIZE);
return (-1);
}
/*
* Get a handle for a live capture from the given DAG device. Passing a NULL
* device will result in a failure. The promisc flag is ignored because DAG
* cards are always promiscuous. The to_ms parameter is used in setting the
* API polling parameters.
*
* snaplen is now also ignored, until we get per-stream slen support. Set
* slen with approprite DAG tool BEFORE pcap_activate().
*
* See also pcap(3).
*/
static int dag_activate(pcap_t* handle)
{
struct pcap_dag *handlep = handle->priv;
#if 0
char conf[30]; /* dag configure string */
#endif
char *s;
int n;
daginf_t* daginf;
char * newDev = NULL;
char * device = handle->opt.source;
#ifdef HAVE_DAG_STREAMS_API
uint32_t mindata;
struct timeval maxwait;
struct timeval poll;
#endif
if (device == NULL) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "device is NULL: %s", pcap_strerror(errno));
return -1;
}
/* Initialize some components of the pcap structure. */
#ifdef HAVE_DAG_STREAMS_API
newDev = (char *)malloc(strlen(device) + 16);
if (newDev == NULL) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate string for device name: %s\n", pcap_strerror(errno));
goto fail;
}
/* Parse input name to get dag device and stream number if provided */
if (dag_parse_name(device, newDev, strlen(device) + 16, &handlep->dag_stream) < 0) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_parse_name: %s\n", pcap_strerror(errno));
goto fail;
}
device = newDev;
if (handlep->dag_stream%2) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_parse_name: tx (even numbered) streams not supported for capture\n");
goto fail;
}
#else
if (strncmp(device, "/dev/", 5) != 0) {
newDev = (char *)malloc(strlen(device) + 5);
if (newDev == NULL) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate string for device name: %s\n", pcap_strerror(errno));
goto fail;
}
strcpy(newDev, "/dev/");
strcat(newDev, device);
device = newDev;
}
#endif /* HAVE_DAG_STREAMS_API */
/* setup device parameters */
if((handle->fd = dag_open((char *)device)) < 0) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_open %s: %s", device, pcap_strerror(errno));
goto fail;
}
#ifdef HAVE_DAG_STREAMS_API
/* Open requested stream. Can fail if already locked or on error */
if (dag_attach_stream(handle->fd, handlep->dag_stream, 0, 0) < 0) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_attach_stream: %s\n", pcap_strerror(errno));
goto failclose;
}
/* Set up default poll parameters for stream
* Can be overridden by pcap_set_nonblock()
*/
if (dag_get_stream_poll(handle->fd, handlep->dag_stream,
&mindata, &maxwait, &poll) < 0) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_get_stream_poll: %s\n", pcap_strerror(errno));
goto faildetach;
}
if (handle->opt.immediate) {
/* Call callback immediately.
* XXX - is this the right way to handle this?
*/
mindata = 0;
} else {
/* Amount of data to collect in Bytes before calling callbacks.
* Important for efficiency, but can introduce latency
* at low packet rates if to_ms not set!
*/
mindata = 65536;
}
/* Obey opt.timeout (was to_ms) if supplied. This is a good idea!
* Recommend 10-100ms. Calls will time out even if no data arrived.
*/
maxwait.tv_sec = handle->opt.timeout/1000;
maxwait.tv_usec = (handle->opt.timeout%1000) * 1000;
if (dag_set_stream_poll(handle->fd, handlep->dag_stream,
mindata, &maxwait, &poll) < 0) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_set_stream_poll: %s\n", pcap_strerror(errno));
goto faildetach;
}
#else
if((handlep->dag_mem_base = dag_mmap(handle->fd)) == MAP_FAILED) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,"dag_mmap %s: %s\n", device, pcap_strerror(errno));
goto failclose;
}
#endif /* HAVE_DAG_STREAMS_API */
/* XXX Not calling dag_configure() to set slen; this is unsafe in
* multi-stream environments as the gpp config is global.
* Once the firmware provides 'per-stream slen' this can be supported
* again via the Config API without side-effects */
#if 0
/* set the card snap length to the specified snaplen parameter */
/* This is a really bad idea, as different cards have different
* valid slen ranges. Should fix in Config API. */
if (handle->snapshot == 0 || handle->snapshot > MAX_DAG_SNAPLEN) {
handle->snapshot = MAX_DAG_SNAPLEN;
} else if (snaplen < MIN_DAG_SNAPLEN) {
handle->snapshot = MIN_DAG_SNAPLEN;
}
/* snap len has to be a multiple of 4 */
snprintf(conf, 30, "varlen slen=%d", (snaplen + 3) & ~3);
if(dag_configure(handle->fd, conf) < 0) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,"dag_configure %s: %s\n", device, pcap_strerror(errno));
goto faildetach;
}
#endif
#ifdef HAVE_DAG_STREAMS_API
if(dag_start_stream(handle->fd, handlep->dag_stream) < 0) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_start_stream %s: %s\n", device, pcap_strerror(errno));
goto faildetach;
}
#else
if(dag_start(handle->fd) < 0) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_start %s: %s\n", device, pcap_strerror(errno));
goto failclose;
}
#endif /* HAVE_DAG_STREAMS_API */
/*
* Important! You have to ensure bottom is properly
* initialized to zero on startup, it won't give you
* a compiler warning if you make this mistake!
*/
handlep->dag_mem_bottom = 0;
handlep->dag_mem_top = 0;
/*
* Find out how many FCS bits we should strip.
* First, query the card to see if it strips the FCS.
*/
daginf = dag_info(handle->fd);
if ((0x4200 == daginf->device_code) || (0x4230 == daginf->device_code)) {
/* DAG 4.2S and 4.23S already strip the FCS. Stripping the final word again truncates the packet. */
handlep->dag_fcs_bits = 0;
/* Note that no FCS will be supplied. */
handle->linktype_ext = LT_FCS_DATALINK_EXT(0);
} else {
/*
* Start out assuming it's 32 bits.
*/
handlep->dag_fcs_bits = 32;
/* Allow an environment variable to override. */
if ((s = getenv("ERF_FCS_BITS")) != NULL) {
if ((n = atoi(s)) == 0 || n == 16 || n == 32) {
handlep->dag_fcs_bits = n;
} else {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
"pcap_activate %s: bad ERF_FCS_BITS value (%d) in environment\n", device, n);
goto failstop;
}
}
/*
* Did the user request that they not be stripped?
*/
if ((s = getenv("ERF_DONT_STRIP_FCS")) != NULL) {
/* Yes. Note the number of bytes that will be
supplied. */
handle->linktype_ext = LT_FCS_DATALINK_EXT(handlep->dag_fcs_bits/16);
/* And don't strip them. */
handlep->dag_fcs_bits = 0;
}
}
handlep->dag_timeout = handle->opt.timeout;
handle->linktype = -1;
if (dag_get_datalink(handle) < 0)
goto failstop;
handle->bufsize = 0;
if (new_pcap_dag(handle) < 0) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "new_pcap_dag %s: %s\n", device, pcap_strerror(errno));
goto failstop;
}
/*
* "select()" and "poll()" don't work on DAG device descriptors.
*/
handle->selectable_fd = -1;
if (newDev != NULL) {
free((char *)newDev);
}
handle->read_op = dag_read;
handle->inject_op = dag_inject;
handle->setfilter_op = dag_setfilter;
handle->setdirection_op = NULL; /* Not implemented.*/
handle->set_datalink_op = dag_set_datalink;
handle->getnonblock_op = pcap_getnonblock_fd;
handle->setnonblock_op = dag_setnonblock;
handle->stats_op = dag_stats;
handle->cleanup_op = dag_platform_cleanup;
handlep->stat.ps_drop = 0;
handlep->stat.ps_recv = 0;
handlep->stat.ps_ifdrop = 0;
return 0;
#ifdef HAVE_DAG_STREAMS_API
failstop:
if (dag_stop_stream(handle->fd, handlep->dag_stream) < 0) {
fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno));
}
faildetach:
if (dag_detach_stream(handle->fd, handlep->dag_stream) < 0)
fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno));
#else
failstop:
if (dag_stop(handle->fd) < 0)
fprintf(stderr,"dag_stop: %s\n", strerror(errno));
#endif /* HAVE_DAG_STREAMS_API */
failclose:
if (dag_close(handle->fd) < 0)
fprintf(stderr,"dag_close: %s\n", strerror(errno));
delete_pcap_dag(handle);
fail:
pcap_cleanup_live_common(handle);
if (newDev != NULL) {
free((char *)newDev);
}
return PCAP_ERROR;
}
pcap_t *dag_create(const char *device, char *ebuf, int *is_ours)
{
const char *cp;
char *cpend;
long devnum;
pcap_t *p;
#ifdef HAVE_DAG_STREAMS_API
long stream = 0;
#endif
/* Does this look like a DAG device? */
cp = strrchr(device, '/');
if (cp == NULL)
cp = device;
/* Does it begin with "dag"? */
if (strncmp(cp, "dag", 3) != 0) {
/* Nope, doesn't begin with "dag" */
*is_ours = 0;
return NULL;
}
/* Yes - is "dag" followed by a number from 0 to DAG_MAX_BOARDS-1 */
cp += 3;
devnum = strtol(cp, &cpend, 10);
#ifdef HAVE_DAG_STREAMS_API
if (*cpend == ':') {
/* Followed by a stream number. */
stream = strtol(++cpend, &cpend, 10);
}
#endif
if (cpend == cp || *cpend != '\0') {
/* Not followed by a number. */
*is_ours = 0;
return NULL;
}
if (devnum < 0 || devnum >= DAG_MAX_BOARDS) {
/* Followed by a non-valid number. */
*is_ours = 0;
return NULL;
}
#ifdef HAVE_DAG_STREAMS_API
if (stream <0 || stream >= DAG_STREAM_MAX) {
/* Followed by a non-valid stream number. */
*is_ours = 0;
return NULL;
}
#endif
/* OK, it's probably ours. */
*is_ours = 1;
p = pcap_create_common(device, ebuf, sizeof (struct pcap_dag));
if (p == NULL)
return NULL;
p->activate_op = dag_activate;
return p;
}
static int
dag_stats(pcap_t *p, struct pcap_stat *ps) {
struct pcap_dag *pd = p->priv;
/* This needs to be filled out correctly. Hopefully a dagapi call will
provide all necessary information.
*/
/*pd->stat.ps_recv = 0;*/
/*pd->stat.ps_drop = 0;*/
*ps = pd->stat;
return 0;
}
/*
* Previously we just generated a list of all possible names and let
* pcap_add_if() attempt to open each one, but with streams this adds up
* to 81 possibilities which is inefficient.
*
* Since we know more about the devices we can prune the tree here.
* pcap_add_if() will still retest each device but the total number of
* open attempts will still be much less than the naive approach.
*/
int
dag_findalldevs(pcap_if_t **devlistp, char *errbuf)
{
char name[12]; /* XXX - pick a size */
int ret = 0;
int c;
char dagname[DAGNAME_BUFSIZE];
int dagstream;
int dagfd;
/* Try all the DAGs 0-DAG_MAX_BOARDS */
for (c = 0; c < DAG_MAX_BOARDS; c++) {
snprintf(name, 12, "dag%d", c);
if (-1 == dag_parse_name(name, dagname, DAGNAME_BUFSIZE, &dagstream))
{
return -1;
}
if ( (dagfd = dag_open(dagname)) >= 0 ) {
if (pcap_add_if(devlistp, name, 0, NULL, errbuf) == -1) {
/*
* Failure.
*/
ret = -1;
}
#ifdef HAVE_DAG_STREAMS_API
{
int stream, rxstreams;
rxstreams = dag_rx_get_stream_count(dagfd);
for(stream=0;stream<DAG_STREAM_MAX;stream+=2) {
if (0 == dag_attach_stream(dagfd, stream, 0, 0)) {
dag_detach_stream(dagfd, stream);
snprintf(name, 10, "dag%d:%d", c, stream);
if (pcap_add_if(devlistp, name, 0, NULL, errbuf) == -1) {
/*
* Failure.
*/
ret = -1;
}
rxstreams--;
if(rxstreams <= 0) {
break;
}
}
}
}
#endif /* HAVE_DAG_STREAMS_API */
dag_close(dagfd);
}
}
return (ret);
}