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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
|
/* $OpenBSD: print-bgp.c,v 1.16 2014/01/12 11:26:48 deraadt Exp $ */
/*
* Copyright (C) 1999 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
#include "afnum.h"
struct bgp {
u_int8_t bgp_marker[16];
u_int16_t bgp_len;
u_int8_t bgp_type;
};
#define BGP_SIZE 19 /* unaligned */
#define BGP_OPEN 1
#define BGP_UPDATE 2
#define BGP_NOTIFICATION 3
#define BGP_KEEPALIVE 4
#define BGP_ROUTE_REFRESH 5
struct bgp_open {
u_int8_t bgpo_marker[16];
u_int16_t bgpo_len;
u_int8_t bgpo_type;
u_int8_t bgpo_version;
u_int16_t bgpo_myas;
u_int16_t bgpo_holdtime;
u_int32_t bgpo_id;
u_int8_t bgpo_optlen;
/* options should follow */
};
#define BGP_OPEN_SIZE 29 /* unaligned */
struct bgp_opt {
u_int8_t bgpopt_type;
u_int8_t bgpopt_len;
/* variable length */
};
#define BGP_OPT_CAP 2
#define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
#define BGP_UPDATE_MINSIZE 23
struct bgp_notification {
u_int8_t bgpn_marker[16];
u_int16_t bgpn_len;
u_int8_t bgpn_type;
u_int8_t bgpn_major;
u_int8_t bgpn_minor;
/* data should follow */
};
#define BGP_NOTIFICATION_SIZE 21 /* unaligned */
struct bgp_route_refresh {
u_int8_t bgp_marker[16];
u_int16_t len;
u_int8_t type;
u_int8_t afi[2]; /* unaligned; should be u_int16_t */
u_int8_t res;
u_int8_t safi;
};
#define BGP_ROUTE_REFRESH_SIZE 23
struct bgp_attr {
u_int8_t bgpa_flags;
u_int8_t bgpa_type;
union {
u_int8_t len;
u_int16_t elen;
} bgpa_len;
#define bgp_attr_len(p) \
(((p)->bgpa_flags & 0x10) ? \
ntohs((p)->bgpa_len.elen) : (p)->bgpa_len.len)
#define bgp_attr_off(p) \
(((p)->bgpa_flags & 0x10) ? 4 : 3)
};
#define BGPTYPE_ORIGIN 1
#define BGPTYPE_AS_PATH 2
#define BGPTYPE_NEXT_HOP 3
#define BGPTYPE_MULTI_EXIT_DISC 4
#define BGPTYPE_LOCAL_PREF 5
#define BGPTYPE_ATOMIC_AGGREGATE 6
#define BGPTYPE_AGGREGATOR 7
#define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
#define BGPTYPE_ORIGINATOR_ID 9 /* RFC1998 */
#define BGPTYPE_CLUSTER_LIST 10 /* RFC1998 */
#define BGPTYPE_DPA 11 /* draft-ietf-idr-bgp-dpa */
#define BGPTYPE_ADVERTISERS 12 /* RFC1863 */
#define BGPTYPE_RCID_PATH 13 /* RFC1863 */
#define BGPTYPE_MP_REACH_NLRI 14 /* RFC2283 */
#define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC2283 */
#define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */
#define BGPTYPE_AS4_PATH 17 /* RFC4893 */
#define BGPTYPE_AGGREGATOR4 18 /* RFC4893 */
#define BGP_AS_SET 1
#define BGP_AS_SEQUENCE 2
#define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
#define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
static struct tok bgp_as_path_segment_open_values[] = {
{ BGP_AS_SET, " {" },
{ BGP_AS_SEQUENCE, " " },
{ BGP_CONFED_AS_SEQUENCE, " (" },
{ BGP_CONFED_AS_SET, " ({" },
{ 0, NULL},
};
static struct tok bgp_as_path_segment_close_values[] = {
{ BGP_AS_SET, "}" },
{ BGP_AS_SEQUENCE, "" },
{ BGP_CONFED_AS_SEQUENCE, ")" },
{ BGP_CONFED_AS_SET, "})" },
{ 0, NULL},
};
#define BGP_MP_NLRI_MINSIZE 3
static const char *bgptype[] = {
NULL, "OPEN", "UPDATE", "NOTIFICATION", "KEEPALIVE", "ROUTE-REFRESH",
};
#define bgp_type(x) num_or_str(bgptype, sizeof(bgptype)/sizeof(bgptype[0]), (x))
static const char *bgpopt_type[] = {
NULL, "Authentication Information", "Capabilities Advertisement",
};
#define bgp_opttype(x) \
num_or_str(bgpopt_type, sizeof(bgpopt_type)/sizeof(bgpopt_type[0]), (x))
#define BGP_CAPCODE_MP 1
#define BGP_CAPCODE_REFRESH 2
#define BGP_CAPCODE_RESTART 64 /* draft-ietf-idr-restart-05 */
#define BGP_CAPCODE_AS4 65 /* RFC4893 */
static const char *bgp_capcode[] = {
NULL, "MULTI_PROTOCOL", "ROUTE_REFRESH",
/* 3: RFC5291 */ "OUTBOUND_ROUTE_FILTERING",
/* 4: RFC3107 */ "MULTIPLE_ROUTES",
/* 5: RFC5549 */ "EXTENDED_NEXTHOP_ENCODING",
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 64: RFC4724 */ "GRACEFUL_RESTART",
/* 65: RFC4893 */ "AS4", 0,
/* 67: [Chen] */ "DYNAMIC_CAPABILITY",
/* 68: [Appanna] */ "MULTISESSION",
/* 69: [draft-ietf-idr-add-paths] */ "ADD-PATH",
};
#define bgp_capcode(x) \
num_or_str(bgp_capcode, sizeof(bgp_capcode)/sizeof(bgp_capcode[0]), (x))
#define BGP_NOTIFY_MAJOR_CEASE 6
static const char *bgpnotify_major[] = {
NULL, "Message Header Error",
"OPEN Message Error", "UPDATE Message Error",
"Hold Timer Expired", "Finite State Machine Error",
"Cease", "Capability Message Error",
};
#define bgp_notify_major(x) \
num_or_str(bgpnotify_major, \
sizeof(bgpnotify_major)/sizeof(bgpnotify_major[0]), (x))
static const char *bgpnotify_minor_msg[] = {
NULL, "Connection Not Synchronized",
"Bad Message Length", "Bad Message Type",
};
static const char *bgpnotify_minor_open[] = {
NULL, "Unsupported Version Number",
"Bad Peer AS", "Bad BGP Identifier",
"Unsupported Optional Parameter", "Authentication Failure",
"Unacceptable Hold Time", "Unsupported Capability",
};
static const char *bgpnotify_minor_update[] = {
NULL, "Malformed Attribute List",
"Unrecognized Well-known Attribute", "Missing Well-known Attribute",
"Attribute Flags Error", "Attribute Length Error",
"Invalid ORIGIN Attribute", "AS Routing Loop",
"Invalid NEXT_HOP Attribute", "Optional Attribute Error",
"Invalid Network Field", "Malformed AS_PATH",
};
/* RFC 4486 */
#define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
static const char *bgpnotify_minor_cease[] = {
NULL, "Maximum Number of Prefixes Reached", "Administratively Shutdown",
"Peer De-configured", "Administratively Reset", "Connection Rejected",
"Other Configuration Change", "Connection Collision Resolution",
"Out of Resources",
};
static const char *bgpnotify_minor_cap[] = {
NULL, "Invalid Action Value", "Invalid Capability Length",
"Malformed Capability Value", "Unsupported Capability Code",
};
static const char **bgpnotify_minor[] = {
NULL, bgpnotify_minor_msg, bgpnotify_minor_open, bgpnotify_minor_update,
};
static const int bgpnotify_minor_siz[] = {
0,
sizeof(bgpnotify_minor_msg)/sizeof(bgpnotify_minor_msg[0]),
sizeof(bgpnotify_minor_open)/sizeof(bgpnotify_minor_open[0]),
sizeof(bgpnotify_minor_update)/sizeof(bgpnotify_minor_update[0]),
0,
0,
sizeof(bgpnotify_minor_cease)/sizeof(bgpnotify_minor_cease[0]),
sizeof(bgpnotify_minor_cap)/sizeof(bgpnotify_minor_cap[0]),
};
static const char *bgpattr_origin[] = {
"IGP", "EGP", "INCOMPLETE",
};
#define bgp_attr_origin(x) \
num_or_str(bgpattr_origin, \
sizeof(bgpattr_origin)/sizeof(bgpattr_origin[0]), (x))
static const char *bgpattr_type[] = {
NULL, "ORIGIN", "AS_PATH", "NEXT_HOP",
"MULTI_EXIT_DISC", "LOCAL_PREF", "ATOMIC_AGGREGATE", "AGGREGATOR",
"COMMUNITIES", "ORIGINATOR_ID", "CLUSTER_LIST", "DPA",
"ADVERTISERS", "RCID_PATH", "MP_REACH_NLRI", "MP_UNREACH_NLRI",
"EXTD_COMMUNITIES", "AS4_PATH", "AGGREGATOR4",
};
#define bgp_attr_type(x) \
num_or_str(bgpattr_type, \
sizeof(bgpattr_type)/sizeof(bgpattr_type[0]), (x))
/* Subsequent address family identifier, RFC2283 section 7 */
static const char *bgpattr_nlri_safi[] = {
"Reserved", "Unicast", "Multicast", "Unicast+Multicast",
"labeled Unicast", /* MPLS BGP RFC3107 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 64-66: MPLS BGP RFC3107 */
"Tunnel", "VPLS", "MDT",
};
#define bgp_attr_nlri_safi(x) \
num_or_str(bgpattr_nlri_safi, \
sizeof(bgpattr_nlri_safi)/sizeof(bgpattr_nlri_safi[0]), (x))
/* well-known community */
#define BGP_COMMUNITY_NO_EXPORT 0xffffff01
#define BGP_COMMUNITY_NO_ADVERT 0xffffff02
#define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
#define BGP_COMMUNITY_NO_PEER 0xffffff04
static const char *afnumber[] = AFNUM_NAME_STR;
#define af_name(x) \
(((x) == 65535) ? afnumber[0] : \
num_or_str(afnumber, \
sizeof(afnumber)/sizeof(afnumber[0]), (x)))
static const char *
num_or_str(const char **table, size_t siz, int value)
{
static char buf[20];
if (value < 0 || siz <= value || table[value] == NULL) {
snprintf(buf, sizeof(buf), "#%d", value);
return buf;
} else
return table[value];
}
static const char *
bgp_notify_minor(int major, int minor)
{
static const char **table;
int siz;
static char buf[20];
const char *p;
if (0 <= major
&& major < sizeof(bgpnotify_minor)/sizeof(bgpnotify_minor[0])
&& bgpnotify_minor[major]) {
table = bgpnotify_minor[major];
siz = bgpnotify_minor_siz[major];
if (0 <= minor && minor < siz && table[minor])
p = table[minor];
else
p = NULL;
} else
p = NULL;
if (p == NULL) {
snprintf(buf, sizeof(buf), "#%d", minor);
return buf;
} else
return p;
}
static int
decode_prefix4(const u_char *pd, char *buf, u_int buflen)
{
struct in_addr addr;
u_int plen;
int n;
TCHECK(pd[0]);
plen = pd[0]; /*
* prefix length is in bits; packet only contains
* enough bytes of address to contain this many bits
*/
plen = pd[0];
if (plen < 0 || 32 < plen)
return -1;
memset(&addr, 0, sizeof(addr));
TCHECK2(pd[1], (plen + 7) / 8);
memcpy(&addr, &pd[1], (plen + 7) / 8);
if (plen % 8) {
((u_char *)&addr)[(plen + 7) / 8 - 1] &=
((0xff00 >> (plen % 8)) & 0xff);
}
n = snprintf(buf, buflen, "%s/%u", getname((u_char *)&addr), plen);
if (n == -1 || n >= buflen)
return -1;
return 1 + (plen + 7) / 8;
trunc:
return -2;
}
#ifdef INET6
static int
decode_prefix6(const u_char *pd, char *buf, u_int buflen)
{
struct in6_addr addr;
u_int plen;
int n;
TCHECK(pd[0]);
plen = pd[0];
if (plen < 0 || 128 < plen)
return -1;
memset(&addr, 0, sizeof(addr));
TCHECK2(pd[1], (plen + 7) / 8);
memcpy(&addr, &pd[1], (plen + 7) / 8);
if (plen % 8) {
addr.s6_addr[(plen + 7) / 8 - 1] &=
((0xff00 >> (plen % 8)) & 0xff);
}
n = snprintf(buf, buflen, "%s/%u", getname6((u_char *)&addr), plen);
if (n == -1 || n >= buflen)
return -1;
return 1 + (plen + 7) / 8;
trunc:
return -2;
}
#endif
static int
bgp_attr_print(const struct bgp_attr *attr, const u_char *dat, int len)
{
int i;
u_int16_t af;
u_int8_t safi, snpa;
int advance;
int tlen, asn_bytes;
const u_char *p;
char buf[MAXHOSTNAMELEN + 100];
p = dat;
tlen = len;
asn_bytes = 0;
switch (attr->bgpa_type) {
case BGPTYPE_ORIGIN:
if (len != 1)
printf(" invalid len");
else {
TCHECK(p[0]);
printf(" %s", bgp_attr_origin(p[0]));
}
break;
case BGPTYPE_AS4_PATH:
asn_bytes = 4;
/* FALLTHROUGH */
case BGPTYPE_AS_PATH:
/*
* 2-byte speakers will receive AS4_PATH as well AS_PATH (2-byte).
* 4-byte speakers will only receive AS_PATH but it will be 4-byte.
* To identify which is the case, compare the length of the path
* segment value in bytes, with the path segment length from the
* message (counted in # of AS)
*/
if (len % 2) {
printf(" invalid len");
break;
}
if (!len) {
printf(" empty");
break;
}
while (p < dat + len) {
TCHECK(p[0]);
if (asn_bytes == 0) {
asn_bytes = (len-2)/p[1];
}
printf("%s",
tok2str(bgp_as_path_segment_open_values,
"?", p[0]));
for (i = 0; i < p[1] * asn_bytes; i += asn_bytes) {
TCHECK2(p[2 + i], asn_bytes);
printf("%s", i == 0 ? "" : " ");
if (asn_bytes == 2 || EXTRACT_16BITS(&p[2 + i]))
printf("%u%s",
EXTRACT_16BITS(&p[2 + i]),
asn_bytes == 4 ? "." : "");
if (asn_bytes == 4)
printf("%u",
EXTRACT_16BITS(&p[2 + i + 2]));
}
TCHECK(p[0]);
printf("%s",
tok2str(bgp_as_path_segment_close_values,
"?", p[0]));
TCHECK(p[1]);
p += 2 + p[1] * asn_bytes;
}
break;
case BGPTYPE_NEXT_HOP:
if (len != 4)
printf(" invalid len");
else {
TCHECK2(p[0], 4);
printf(" %s", getname(p));
}
break;
case BGPTYPE_MULTI_EXIT_DISC:
case BGPTYPE_LOCAL_PREF:
if (len != 4)
printf(" invalid len");
else {
TCHECK2(p[0], 4);
printf(" %u", EXTRACT_32BITS(p));
}
break;
case BGPTYPE_ATOMIC_AGGREGATE:
if (len != 0)
printf(" invalid len");
break;
case BGPTYPE_AGGREGATOR4:
case BGPTYPE_AGGREGATOR:
/*
* like AS_PATH/AS4_PATH, AGGREGATOR can contain
* either 2-byte or 4-byte ASN, and AGGREGATOR4
* always contains 4-byte ASN.
*/
if (len != 6 && len != 8) {
printf(" invalid len");
break;
}
TCHECK2(p[0], len);
printf(" AS #");
if (len == 6 || EXTRACT_16BITS(p))
printf("%u%s", EXTRACT_16BITS(p), len == 8 ? "." : "");
if (len == 8)
printf("%u", EXTRACT_16BITS(p+2));
printf(", origin %s", getname(p+len-4));
break;
case BGPTYPE_COMMUNITIES:
if (len % 4) {
printf(" invalid len");
break;
}
while (tlen>0) {
u_int32_t comm;
TCHECK2(p[0], 4);
comm = EXTRACT_32BITS(p);
switch (comm) {
case BGP_COMMUNITY_NO_EXPORT:
printf(" NO_EXPORT");
break;
case BGP_COMMUNITY_NO_ADVERT:
printf(" NO_ADVERTISE");
break;
case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
printf(" NO_EXPORT_SUBCONFED");
break;
case BGP_COMMUNITY_NO_PEER:
printf(" NO_PEER");
break;
default:
printf(" %d:%d",
(comm >> 16) & 0xffff, comm & 0xffff);
break;
}
tlen -= 4;
p += 4;
}
break;
case BGPTYPE_ORIGINATOR_ID:
if (len != 4) {
printf(" invalid len");
break;
}
TCHECK2(p[0], 4);
printf("%s",getname(p));
break;
case BGPTYPE_CLUSTER_LIST:
if (len % 4) {
printf(" invalid len");
break;
}
while (tlen>0) {
TCHECK2(p[0], 4);
printf(" %s%s",
getname(p),
(tlen>4) ? ", " : "");
tlen -=4;
p +=4;
}
break;
case BGPTYPE_MP_REACH_NLRI:
TCHECK2(p[0], BGP_MP_NLRI_MINSIZE);
af = EXTRACT_16BITS(p);
safi = p[2];
if (safi >= 128)
printf(" %s vendor specific %u,", af_name(af), safi);
else {
printf(" %s %s,", af_name(af),
bgp_attr_nlri_safi(safi));
}
p += 3;
if (af == AFNUM_INET)
;
#ifdef INET6
else if (af == AFNUM_INET6)
;
#endif
else
break;
TCHECK(p[0]);
tlen = p[0];
if (tlen) {
printf(" nexthop");
i = 0;
while (i < tlen) {
switch (af) {
case AFNUM_INET:
TCHECK2(p[1+i], sizeof(struct in_addr));
printf(" %s", getname(p + 1 + i));
i += sizeof(struct in_addr);
break;
#ifdef INET6
case AFNUM_INET6:
TCHECK2(p[1+i], sizeof(struct in6_addr));
printf(" %s", getname6(p + 1 + i));
i += sizeof(struct in6_addr);
break;
#endif
default:
printf(" (unknown af)");
i = tlen; /*exit loop*/
break;
}
}
printf(",");
}
p += 1 + tlen;
TCHECK(p[0]);
snpa = p[0];
p++;
if (snpa) {
printf(" %u snpa", snpa);
for (/*nothing*/; snpa > 0; snpa--) {
TCHECK(p[0]);
printf("(%d bytes)", p[0]);
p += p[0] + 1;
}
printf(",");
}
printf(" NLRI");
while (len - (p - dat) > 0) {
switch (af) {
case AFNUM_INET:
advance = decode_prefix4(p, buf, sizeof(buf));
break;
#ifdef INET6
case AFNUM_INET6:
advance = decode_prefix6(p, buf, sizeof(buf));
break;
#endif
default:
printf(" (unknown af)");
advance = 0;
p = dat + len;
break;
}
if (advance <= 0)
break;
printf(" %s", buf);
p += advance;
}
break;
case BGPTYPE_MP_UNREACH_NLRI:
TCHECK2(p[0], BGP_MP_NLRI_MINSIZE);
af = EXTRACT_16BITS(p);
safi = p[2];
if (safi >= 128)
printf(" %s vendor specific %u,", af_name(af), safi);
else {
printf(" %s %s,", af_name(af),
bgp_attr_nlri_safi(safi));
}
p += 3;
printf(" Withdraw");
while (len - (p - dat) > 0) {
switch (af) {
case AFNUM_INET:
advance = decode_prefix4(p, buf, sizeof(buf));
break;
#ifdef INET6
case AFNUM_INET6:
advance = decode_prefix6(p, buf, sizeof(buf));
break;
#endif
default:
printf(" (unknown af)");
advance = 0;
p = dat + len;
break;
}
if (advance <= 0)
break;
printf(" %s", buf);
p += advance;
}
break;
default:
break;
}
return 1;
trunc:
return 0;
}
static void
bgp_open_capa_print(const u_char *opt, int length)
{
int i,cap_type,cap_len,tcap_len,cap_offset;
i = 0;
while (i < length) {
TCHECK2(opt[i], 2);
cap_type=opt[i];
cap_len=opt[i+1];
printf("%sCAP %s", i == 0 ? "(" : " ", /* ) */
bgp_capcode(cap_type));
/* can we print the capability? */
TCHECK2(opt[i+2],cap_len);
i += 2;
switch(cap_type) {
case BGP_CAPCODE_MP:
if (cap_len != 4) {
printf(" BAD ENCODING");
break;
}
printf(" [%s %s]",
af_name(EXTRACT_16BITS(opt+i)),
bgp_attr_nlri_safi(opt[i+3]));
break;
case BGP_CAPCODE_REFRESH:
if (cap_len != 0) {
printf(" BAD ENCODING");
break;
}
break;
case BGP_CAPCODE_RESTART:
if (cap_len < 2 || (cap_len - 2) % 4) {
printf(" BAD ENCODING");
break;
}
printf(" [%s], Time %us",
((opt[i])&0x80) ? "R" : "none",
EXTRACT_16BITS(opt+i)&0xfff);
tcap_len=cap_len - 2;
cap_offset=2;
while(tcap_len>=4) {
printf(" (%s %s)%s",
af_name(EXTRACT_16BITS(opt+i+cap_offset)),
bgp_attr_nlri_safi(opt[i+cap_offset+2]),
((opt[i+cap_offset+3])&0x80) ?
" forwarding state preserved" : "" );
tcap_len-=4;
cap_offset+=4;
}
break;
case BGP_CAPCODE_AS4:
if (cap_len != 4) {
printf(" BAD ENCODING");
break;
}
printf(" #");
if (EXTRACT_16BITS(opt+i))
printf("%u.",
EXTRACT_16BITS(opt+i));
printf("%u",
EXTRACT_16BITS(opt+i+2));
break;
default:
printf(" len %d", cap_len);
break;
}
i += cap_len;
if (i + cap_len < length)
printf(",");
}
/* ( */
printf(")");
return;
trunc:
printf("[|BGP]");
}
static void
bgp_open_print(const u_char *dat, int length)
{
struct bgp_open bgpo;
struct bgp_opt bgpopt;
const u_char *opt;
int i;
TCHECK2(dat[0], BGP_OPEN_SIZE);
memcpy(&bgpo, dat, BGP_OPEN_SIZE);
printf(": Version %d,", bgpo.bgpo_version);
printf(" AS #%u,", ntohs(bgpo.bgpo_myas));
printf(" Holdtime %u,", ntohs(bgpo.bgpo_holdtime));
printf(" ID %s,", getname((u_char *)&bgpo.bgpo_id));
printf(" Option length %u", bgpo.bgpo_optlen);
/* sanity checking */
if ((length < bgpo.bgpo_optlen+BGP_OPEN_SIZE) || (!bgpo.bgpo_optlen))
return;
/* ugly! */
opt = &((const struct bgp_open *)dat)->bgpo_optlen;
opt++;
i = 0;
while (i < bgpo.bgpo_optlen) {
TCHECK2(opt[i], BGP_OPT_SIZE);
memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE);
if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
printf(" [|opt %d %d]", bgpopt.bgpopt_len, bgpopt.bgpopt_type);
break;
}
if (i == 0)
printf(" ("); /* ) */
else
printf(" ");
switch(bgpopt.bgpopt_type) {
case BGP_OPT_CAP:
bgp_open_capa_print(opt + i + BGP_OPT_SIZE,
bgpopt.bgpopt_len);
break;
default:
printf(" (option %s, len=%u)",
bgp_opttype(bgpopt.bgpopt_type),
bgpopt.bgpopt_len);
break;
}
i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
}
/* ( */
printf(")");
return;
trunc:
printf("[|BGP]");
}
static void
bgp_update_print(const u_char *dat, int length)
{
struct bgp bgp;
struct bgp_attr bgpa;
const u_char *p;
int len;
int i;
int newline;
TCHECK2(dat[0], BGP_SIZE);
memcpy(&bgp, dat, BGP_SIZE);
p = dat + BGP_SIZE; /*XXX*/
printf(":");
/* Unfeasible routes */
len = EXTRACT_16BITS(p);
if (len) {
/*
* Without keeping state from the original NLRI message,
* it's not possible to tell if this a v4 or v6 route,
* so only try to decode it if we're not v6 enabled.
*/
#ifdef INET6
printf(" (Withdrawn routes: %d bytes)", len);
#else
char buf[MAXHOSTNAMELEN + 100];
int wpfx;
TCHECK2(p[2], len);
i = 2;
printf(" (Withdrawn routes:");
while(i < 2 + len) {
wpfx = decode_prefix4(&p[i], buf, sizeof(buf));
if (wpfx == -1) {
printf(" (illegal prefix length)");
break;
} else if (wpfx == -2)
goto trunc;
i += wpfx;
printf(" %s", buf);
}
printf(")");
#endif
}
p += 2 + len;
TCHECK2(p[0], 2);
len = EXTRACT_16BITS(p);
if (len == 0 && length == BGP_UPDATE_MINSIZE) {
printf(" End-of-Rib Marker (empty NLRI)");
return;
}
if (len) {
/* do something more useful!*/
i = 2;
printf(" (Path attributes:"); /* ) */
newline = 0;
while (i < 2 + len) {
int alen, aoff;
TCHECK2(p[i], sizeof(bgpa));
memcpy(&bgpa, &p[i], sizeof(bgpa));
alen = bgp_attr_len(&bgpa);
aoff = bgp_attr_off(&bgpa);
if (vflag && newline)
printf("\n\t\t");
else
printf(" ");
printf("("); /* ) */
printf("%s", bgp_attr_type(bgpa.bgpa_type));
if (bgpa.bgpa_flags) {
printf("[%s%s%s%s",
bgpa.bgpa_flags & 0x80 ? "O" : "",
bgpa.bgpa_flags & 0x40 ? "T" : "",
bgpa.bgpa_flags & 0x20 ? "P" : "",
bgpa.bgpa_flags & 0x10 ? "E" : "");
if (bgpa.bgpa_flags & 0xf)
printf("+%x", bgpa.bgpa_flags & 0xf);
printf("]");
}
if (!bgp_attr_print(&bgpa, &p[i + aoff], alen))
goto trunc;
newline = 1;
/* ( */
printf(")");
i += aoff + alen;
}
/* ( */
printf(")");
}
p += 2 + len;
if (len && dat + length > p)
printf("\n\t\t");
if (dat + length > p) {
printf("(NLRI:"); /* ) */
while (dat + length > p) {
char buf[MAXHOSTNAMELEN + 100];
i = decode_prefix4(p, buf, sizeof(buf));
if (i == -1) {
printf(" (illegal prefix length)");
break;
} else if (i == -2)
goto trunc;
printf(" %s", buf);
p += i;
}
/* ( */
printf(")");
}
return;
trunc:
printf("[|BGP]");
}
static void
bgp_notification_print(const u_char *dat, int length)
{
struct bgp_notification bgpn;
u_int16_t af;
u_int8_t safi;
const u_char *p;
TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
/* sanity checking */
if (length<BGP_NOTIFICATION_SIZE)
return;
printf(": error %s,", bgp_notify_major(bgpn.bgpn_major));
printf(" subcode %s",
bgp_notify_minor(bgpn.bgpn_major, bgpn.bgpn_minor));
if (bgpn.bgpn_major == BGP_NOTIFY_MAJOR_CEASE) {
/*
* RFC 4486: optional maxprefix subtype of 7 bytes
* may contain AFI, SAFI and MAXPREFIXES
*/
if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX &&
length >= BGP_NOTIFICATION_SIZE + 7) {
p = dat + BGP_NOTIFICATION_SIZE;
TCHECK2(*p, 7);
af = EXTRACT_16BITS(p);
safi = p[2];
printf(" %s %s,", af_name(af),
bgp_attr_nlri_safi(safi));
printf(" Max Prefixes: %u", EXTRACT_32BITS(p+3));
}
}
return;
trunc:
printf("[|BGP]");
}
static void
bgp_route_refresh_print(const u_char *dat, int length)
{
const struct bgp_route_refresh *bgp_route_refresh_header;
TCHECK2(dat[0], BGP_ROUTE_REFRESH_SIZE);
/* sanity checking */
if (length<BGP_ROUTE_REFRESH_SIZE)
return;
bgp_route_refresh_header = (const struct bgp_route_refresh *)dat;
printf(" (%s %s)",
af_name(EXTRACT_16BITS(&bgp_route_refresh_header->afi)),
bgp_attr_nlri_safi(bgp_route_refresh_header->safi));
return;
trunc:
printf("[|BGP]");
}
static int
bgp_header_print(const u_char *dat, int length)
{
struct bgp bgp;
TCHECK2(dat[0], BGP_SIZE);
memcpy(&bgp, dat, BGP_SIZE);
printf("(%s", bgp_type(bgp.bgp_type)); /* ) */
switch (bgp.bgp_type) {
case BGP_OPEN:
bgp_open_print(dat, length);
break;
case BGP_UPDATE:
bgp_update_print(dat, length);
break;
case BGP_NOTIFICATION:
bgp_notification_print(dat, length);
break;
case BGP_KEEPALIVE:
break;
case BGP_ROUTE_REFRESH:
bgp_route_refresh_print(dat, length);
default:
TCHECK2(*dat, length);
break;
}
/* ( */
printf(")");
return 1;
trunc:
printf("[|BGP]");
return 0;
}
void
bgp_print(const u_char *dat, int length)
{
const u_char *p;
const u_char *ep;
const u_char *start;
const u_char marker[] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
};
struct bgp bgp;
u_int16_t hlen;
int newline;
ep = dat + length;
if (snapend < dat + length)
ep = snapend;
printf(": BGP");
p = dat;
newline = 0;
start = p;
while (p < ep) {
if (!TTEST2(p[0], 1))
break;
if (p[0] != 0xff) {
p++;
continue;
}
if (!TTEST2(p[0], sizeof(marker)))
break;
if (memcmp(p, marker, sizeof(marker)) != 0) {
p++;
continue;
}
/* found BGP header */
TCHECK2(p[0], BGP_SIZE); /*XXX*/
memcpy(&bgp, p, BGP_SIZE);
if (start != p)
printf(" [|BGP]");
hlen = ntohs(bgp.bgp_len);
if (vflag && newline)
printf("\n\t");
else
printf(" ");
if (hlen < BGP_SIZE) {
printf("\n[|BGP Bogus header length %u < %u]",
hlen, BGP_SIZE);
break;
}
if (TTEST2(p[0], hlen)) {
if (!bgp_header_print(p, hlen))
return;
newline = 1;
p += hlen;
start = p;
} else {
printf("[|BGP %s]", bgp_type(bgp.bgp_type));
break;
}
}
return;
trunc:
printf(" [|BGP]");
}
|