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add support for graceful-restart end-of-rib marker
[tcpdump] / print-bgp.c
1 /*
2 * Copyright (C) 1999 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * Extensively modified by Hannes Gredler (hannes@juniper.net) for more
30 * complete BGP support.
31 */
32
33 #ifdef HAVE_CONFIG_H
34 #include "config.h"
35 #endif
36
37 #ifndef lint
38 static const char rcsid[] _U_ =
39 "@(#) $Header: /tcpdump/master/tcpdump/print-bgp.c,v 1.88 2004-06-22 15:04:51 hannes Exp $";
40 #endif
41
42 #include <tcpdump-stdinc.h>
43
44 #include <stdio.h>
45 #include <string.h>
46
47 #include "interface.h"
48 #include "decode_prefix.h"
49 #include "addrtoname.h"
50 #include "extract.h"
51 #include "bgp.h"
52 #include "l2vpn.h"
53
54 struct bgp {
55 u_int8_t bgp_marker[16];
56 u_int16_t bgp_len;
57 u_int8_t bgp_type;
58 };
59 #define BGP_SIZE 19 /* unaligned */
60
61 #define BGP_OPEN 1
62 #define BGP_UPDATE 2
63 #define BGP_NOTIFICATION 3
64 #define BGP_KEEPALIVE 4
65 #define BGP_ROUTE_REFRESH 5
66
67 static struct tok bgp_msg_values[] = {
68 { BGP_OPEN, "Open"},
69 { BGP_UPDATE, "Update"},
70 { BGP_NOTIFICATION, "Notification"},
71 { BGP_KEEPALIVE, "Keepalive"},
72 { BGP_ROUTE_REFRESH, "Route Refresh"},
73 { 0, NULL}
74 };
75
76 struct bgp_open {
77 u_int8_t bgpo_marker[16];
78 u_int16_t bgpo_len;
79 u_int8_t bgpo_type;
80 u_int8_t bgpo_version;
81 u_int16_t bgpo_myas;
82 u_int16_t bgpo_holdtime;
83 u_int32_t bgpo_id;
84 u_int8_t bgpo_optlen;
85 /* options should follow */
86 };
87 #define BGP_OPEN_SIZE 29 /* unaligned */
88
89 struct bgp_opt {
90 u_int8_t bgpopt_type;
91 u_int8_t bgpopt_len;
92 /* variable length */
93 };
94 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
95
96 #define BGP_UPDATE_MINSIZE 23
97
98 struct bgp_notification {
99 u_int8_t bgpn_marker[16];
100 u_int16_t bgpn_len;
101 u_int8_t bgpn_type;
102 u_int8_t bgpn_major;
103 u_int8_t bgpn_minor;
104 };
105 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
106
107 struct bgp_route_refresh {
108 u_int8_t bgp_marker[16];
109 u_int16_t len;
110 u_int8_t type;
111 u_int8_t afi[2]; /* the compiler messes this structure up */
112 u_int8_t res; /* when doing misaligned sequences of int8 and int16 */
113 u_int8_t safi; /* afi should be int16 - so we have to access it using */
114 }; /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh) */
115 #define BGP_ROUTE_REFRESH_SIZE 23
116
117 struct bgp_attr {
118 u_int8_t bgpa_flags;
119 u_int8_t bgpa_type;
120 union {
121 u_int8_t len;
122 u_int16_t elen;
123 } bgpa_len;
124 #define bgp_attr_len(p) \
125 (((p)->bgpa_flags & 0x10) ? \
126 EXTRACT_16BITS(&(p)->bgpa_len.elen) : (p)->bgpa_len.len)
127 #define bgp_attr_off(p) \
128 (((p)->bgpa_flags & 0x10) ? 4 : 3)
129 };
130
131 #define BGPTYPE_ORIGIN 1
132 #define BGPTYPE_AS_PATH 2
133 #define BGPTYPE_NEXT_HOP 3
134 #define BGPTYPE_MULTI_EXIT_DISC 4
135 #define BGPTYPE_LOCAL_PREF 5
136 #define BGPTYPE_ATOMIC_AGGREGATE 6
137 #define BGPTYPE_AGGREGATOR 7
138 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
139 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC1998 */
140 #define BGPTYPE_CLUSTER_LIST 10 /* RFC1998 */
141 #define BGPTYPE_DPA 11 /* draft-ietf-idr-bgp-dpa */
142 #define BGPTYPE_ADVERTISERS 12 /* RFC1863 */
143 #define BGPTYPE_RCID_PATH 13 /* RFC1863 */
144 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC2283 */
145 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC2283 */
146 #define BGPTYPE_EXTD_COMMUNITIES 16 /* draft-ietf-idr-bgp-ext-communities */
147 #define BGPTYPE_ATTR_SET 128 /* draft-marques-ppvpn-ibgp */
148
149 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
150
151 static struct tok bgp_attr_values[] = {
152 { BGPTYPE_ORIGIN, "Origin"},
153 { BGPTYPE_AS_PATH, "AS Path"},
154 { BGPTYPE_NEXT_HOP, "Next Hop"},
155 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
156 { BGPTYPE_LOCAL_PREF, "Local Preference"},
157 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
158 { BGPTYPE_AGGREGATOR, "Aggregator"},
159 { BGPTYPE_COMMUNITIES, "Community"},
160 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
161 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
162 { BGPTYPE_DPA, "DPA"},
163 { BGPTYPE_ADVERTISERS, "Advertisers"},
164 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"},
165 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
166 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
167 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
168 { BGPTYPE_ATTR_SET, "Attribute Set"},
169 { 255, "Reserved for development"},
170 { 0, NULL}
171 };
172
173 #define BGP_AS_SET 1
174 #define BGP_AS_SEQUENCE 2
175 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
176 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
177
178 static struct tok bgp_as_path_segment_open_values[] = {
179 { BGP_AS_SEQUENCE, ""},
180 { BGP_AS_SET, "{ "},
181 { BGP_CONFED_AS_SEQUENCE, "( "},
182 { BGP_CONFED_AS_SET, "({ "},
183 { 0, NULL}
184 };
185
186 static struct tok bgp_as_path_segment_close_values[] = {
187 { BGP_AS_SEQUENCE, ""},
188 { BGP_AS_SET, "}"},
189 { BGP_CONFED_AS_SEQUENCE, ")"},
190 { BGP_CONFED_AS_SET, "})"},
191 { 0, NULL}
192 };
193
194 #define BGP_OPT_AUTH 1
195 #define BGP_OPT_CAP 2
196
197
198 static struct tok bgp_opt_values[] = {
199 { BGP_OPT_AUTH, "Authentication Information"},
200 { BGP_OPT_CAP, "Capabilities Advertisement"},
201 { 0, NULL}
202 };
203
204 #define BGP_CAPCODE_MP 1
205 #define BGP_CAPCODE_RR 2
206 #define BGP_CAPCODE_ORF 3 /* XXX */
207 #define BGP_CAPCODE_RESTART 64 /* draft-ietf-idr-restart-05 */
208 #define BGP_CAPCODE_AS_NEW 65 /* XXX */
209 #define BGP_CAPCODE_DYN_CAP 67 /* XXX */
210 #define BGP_CAPCODE_RR_CISCO 128
211
212 static struct tok bgp_capcode_values[] = {
213 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
214 { BGP_CAPCODE_RR, "Route Refresh"},
215 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
216 { BGP_CAPCODE_RESTART, "Graceful Restart"},
217 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
218 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
219 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
220 { 0, NULL}
221 };
222
223 #define BGP_NOTIFY_MAJOR_MSG 1
224 #define BGP_NOTIFY_MAJOR_OPEN 2
225 #define BGP_NOTIFY_MAJOR_UPDATE 3
226 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
227 #define BGP_NOTIFY_MAJOR_FSM 5
228 #define BGP_NOTIFY_MAJOR_CEASE 6
229 #define BGP_NOTIFY_MAJOR_CAP 7
230
231 static struct tok bgp_notify_major_values[] = {
232 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
233 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
234 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
235 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
236 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
237 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
238 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"},
239 { 0, NULL}
240 };
241
242 /* draft-ietf-idr-cease-subcode-02 */
243 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
244 static struct tok bgp_notify_minor_cease_values[] = {
245 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
246 { 2, "Administratively Shutdown"},
247 { 3, "Peer Unconfigured"},
248 { 4, "Administratively Reset"},
249 { 5, "Connection Rejected"},
250 { 6, "Other Configuration Change"},
251 { 7, "Connection Collision Resolution"},
252 { 0, NULL}
253 };
254
255 static struct tok bgp_notify_minor_msg_values[] = {
256 { 1, "Connection Not Synchronized"},
257 { 2, "Bad Message Length"},
258 { 3, "Bad Message Type"},
259 { 0, NULL}
260 };
261
262 static struct tok bgp_notify_minor_open_values[] = {
263 { 1, "Unsupported Version Number"},
264 { 2, "Bad Peer AS"},
265 { 3, "Bad BGP Identifier"},
266 { 4, "Unsupported Optional Parameter"},
267 { 5, "Authentication Failure"},
268 { 6, "Unacceptable Hold Time"},
269 { 0, NULL}
270 };
271
272 static struct tok bgp_notify_minor_update_values[] = {
273 { 1, "Malformed Attribute List"},
274 { 2, "Unrecognized Well-known Attribute"},
275 { 3, "Missing Well-known Attribute"},
276 { 4, "Attribute Flags Error"},
277 { 5, "Attribute Length Error"},
278 { 6, "Invalid ORIGIN Attribute"},
279 { 7, "AS Routing Loop"},
280 { 8, "Invalid NEXT_HOP Attribute"},
281 { 9, "Optional Attribute Error"},
282 { 10, "Invalid Network Field"},
283 { 11, "Malformed AS_PATH"},
284 { 0, NULL}
285 };
286
287 static struct tok bgp_notify_minor_cap_values[] = {
288 { 1, "Invalid Action Value" },
289 { 2, "Invalid Capability Length" },
290 { 3, "Malformed Capability Value" },
291 { 4, "Unsupported Capability Code" },
292 { 0, NULL }
293 };
294
295 static struct tok bgp_origin_values[] = {
296 { 0, "IGP"},
297 { 1, "EGP"},
298 { 2, "Incomplete"},
299 { 0, NULL}
300 };
301
302 /* Subsequent address family identifier, RFC2283 section 7 */
303 #define SAFNUM_RES 0
304 #define SAFNUM_UNICAST 1
305 #define SAFNUM_MULTICAST 2
306 #define SAFNUM_UNIMULTICAST 3
307 /* labeled BGP RFC3107 */
308 #define SAFNUM_LABUNICAST 4
309 #define SAFNUM_TUNNEL 64 /* XXX */
310 #define SAFNUM_VPLS 65 /* XXX */
311 #define SAFNUM_MDT 66 /* XXX */
312 /* Section 4.3.4 of draft-rosen-rfc2547bis-03.txt */
313 #define SAFNUM_VPNUNICAST 128
314 #define SAFNUM_VPNMULTICAST 129
315 #define SAFNUM_VPNUNIMULTICAST 130
316 /* draft-marques-ppvpn-rt-constrain-01.txt */
317 #define SAFNUM_RT_ROUTING_INFO 132
318
319 #define BGP_VPN_RD_LEN 8
320
321 static struct tok bgp_safi_values[] = {
322 { SAFNUM_RES, "Reserved"},
323 { SAFNUM_UNICAST, "Unicast"},
324 { SAFNUM_MULTICAST, "Multicast"},
325 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
326 { SAFNUM_LABUNICAST, "labeled Unicast"},
327 { SAFNUM_TUNNEL, "Tunnel"},
328 { SAFNUM_VPLS, "VPLS"},
329 { SAFNUM_MDT, "MDT"},
330 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
331 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
332 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
333 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"}, /* draft-marques-ppvpn-rt-constrain-01.txt */
334 { 0, NULL }
335 };
336
337 /* well-known community */
338 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
339 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
340 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
341
342 /* RFC1700 address family numbers */
343 #define AFNUM_INET 1
344 #define AFNUM_INET6 2
345 #define AFNUM_NSAP 3
346 #define AFNUM_HDLC 4
347 #define AFNUM_BBN1822 5
348 #define AFNUM_802 6
349 #define AFNUM_E163 7
350 #define AFNUM_E164 8
351 #define AFNUM_F69 9
352 #define AFNUM_X121 10
353 #define AFNUM_IPX 11
354 #define AFNUM_ATALK 12
355 #define AFNUM_DECNET 13
356 #define AFNUM_BANYAN 14
357 #define AFNUM_E164NSAP 15
358 /* draft-kompella-ppvpn-l2vpn */
359 #define AFNUM_L2VPN 196 /* still to be approved by IANA */
360
361 static struct tok bgp_afi_values[] = {
362 { 0, "Reserved"},
363 { AFNUM_INET, "IPv4"},
364 { AFNUM_INET6, "IPv6"},
365 { AFNUM_NSAP, "NSAP"},
366 { AFNUM_HDLC, "HDLC"},
367 { AFNUM_BBN1822, "BBN 1822"},
368 { AFNUM_802, "802"},
369 { AFNUM_E163, "E.163"},
370 { AFNUM_E164, "E.164"},
371 { AFNUM_F69, "F.69"},
372 { AFNUM_X121, "X.121"},
373 { AFNUM_IPX, "Novell IPX"},
374 { AFNUM_ATALK, "Appletalk"},
375 { AFNUM_DECNET, "Decnet IV"},
376 { AFNUM_BANYAN, "Banyan Vines"},
377 { AFNUM_E164NSAP, "E.164 with NSAP subaddress"},
378 { AFNUM_L2VPN, "Layer-2 VPN"},
379 { 0, NULL},
380 };
381
382 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */
383 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
384 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
385 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
386 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
387 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
388 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
389 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
390 /* rfc2547 bgp-mpls-vpns */
391 #define BGP_EXT_COM_CISCO_MCAST 0x0009 /* cisco proprietary */
392
393 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
394 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatability */
395 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatability */
396 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatability */
397
398 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
399 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatability */
400
401 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
402 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatability */
403
404 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
405
406 static struct tok bgp_extd_comm_flag_values[] = {
407 { 0x8000, "vendor-specific"},
408 { 0x4000, "non-transitive"},
409 { 0, NULL},
410 };
411
412 static struct tok bgp_extd_comm_subtype_values[] = {
413 { BGP_EXT_COM_RT_0, "target"},
414 { BGP_EXT_COM_RT_1, "target"},
415 { BGP_EXT_COM_RT_2, "target"},
416 { BGP_EXT_COM_RO_0, "origin"},
417 { BGP_EXT_COM_RO_1, "origin"},
418 { BGP_EXT_COM_RO_2, "origin"},
419 { BGP_EXT_COM_LINKBAND, "link-BW"},
420 { BGP_EXT_COM_CISCO_MCAST, "mdt-group"},
421 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
422 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
423 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
424 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
425 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
426 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
427 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
428 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
429 { BGP_EXT_COM_L2INFO, "layer2-info"},
430 { 0, NULL},
431 };
432
433 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
434 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
435 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
436 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
437 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
438 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
439 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
440 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
441
442 static struct tok bgp_extd_comm_ospf_rtype_values[] = {
443 { BGP_OSPF_RTYPE_RTR, "Router" },
444 { BGP_OSPF_RTYPE_NET, "Network" },
445 { BGP_OSPF_RTYPE_SUM, "Summary" },
446 { BGP_OSPF_RTYPE_EXT, "External" },
447 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
448 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
449 { 0, NULL },
450 };
451
452 int
453 decode_prefix4(const u_char *pptr, char *buf, u_int buflen)
454 {
455 struct in_addr addr;
456 u_int plen;
457
458 TCHECK(pptr[0]);
459 plen = pptr[0];
460 if (32 < plen)
461 return -1;
462
463 memset(&addr, 0, sizeof(addr));
464 TCHECK2(pptr[1], (plen + 7) / 8);
465 memcpy(&addr, &pptr[1], (plen + 7) / 8);
466 if (plen % 8) {
467 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
468 ((0xff00 >> (plen % 8)) & 0xff);
469 }
470 snprintf(buf, buflen, "%s/%d", getname((u_char *)&addr), plen);
471 return 1 + (plen + 7) / 8;
472
473 trunc:
474 return -2;
475 }
476
477 static int
478 decode_labeled_prefix4(const u_char *pptr, char *buf, u_int buflen)
479 {
480 struct in_addr addr;
481 u_int plen;
482
483 TCHECK(pptr[0]);
484 plen = pptr[0]; /* get prefix length */
485
486 /* this is one of the weirdnesses of rfc3107
487 the label length (actually the label + COS bits)
488 is added to the prefix length;
489 we also do only read out just one label -
490 there is no real application for advertisement of
491 stacked labels in a a single BGP message
492 */
493
494 plen-=24; /* adjust prefixlen - labellength */
495
496 if (32 < plen)
497 return -1;
498
499 memset(&addr, 0, sizeof(addr));
500 TCHECK2(pptr[4], (plen + 7) / 8);
501 memcpy(&addr, &pptr[4], (plen + 7) / 8);
502 if (plen % 8) {
503 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
504 ((0xff00 >> (plen % 8)) & 0xff);
505 }
506 /* the label may get offsetted by 4 bits so lets shift it right */
507 snprintf(buf, buflen, "%s/%d, label:%u %s",
508 getname((u_char *)&addr),
509 plen,
510 EXTRACT_24BITS(pptr+1)>>4,
511 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
512
513 return 4 + (plen + 7) / 8;
514
515 trunc:
516 return -2;
517 }
518
519 /* RDs and RTs share the same semantics
520 * we use bgp_vpn_rd_print for
521 * printing route targets inside a NLRI */
522 char *
523 bgp_vpn_rd_print (const u_char *pptr) {
524
525 /* allocate space for the largest possible string */
526 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
527 char *pos = rd;
528
529 /* ok lets load the RD format */
530 switch (EXTRACT_16BITS(pptr)) {
531
532 /* AS:IP-address fmt*/
533 case 0:
534 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u.%u.%u.%u",
535 EXTRACT_16BITS(pptr+2), *(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7));
536 break;
537 /* IP-address:AS fmt*/
538
539 case 1:
540 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
541 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6));
542 break;
543
544 /* 4-byte-AS:number fmt*/
545 case 2:
546 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (%u.%u.%u.%u:%u)",
547 EXTRACT_32BITS(pptr+2), EXTRACT_16BITS(pptr+6),
548 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6));
549 break;
550 default:
551 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
552 break;
553 }
554 pos += strlen(pos);
555 *(pos) = '\0';
556 return (rd);
557 }
558
559 static int
560 decode_rt_routing_info(const u_char *pptr, char *buf, u_int buflen)
561 {
562 u_int8_t route_target[8];
563 u_int plen;
564
565 TCHECK(pptr[0]);
566 plen = pptr[0]; /* get prefix length */
567
568 plen-=32; /* adjust prefix length */
569
570 if (0 < plen)
571 return -1;
572
573 memset(&route_target, 0, sizeof(route_target));
574 TCHECK2(pptr[1], (plen + 7) / 8);
575 memcpy(&route_target, &pptr[1], (plen + 7) / 8);
576 if (plen % 8) {
577 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
578 ((0xff00 >> (plen % 8)) & 0xff);
579 }
580 snprintf(buf, buflen, "origin AS: %u, route target %s",
581 EXTRACT_32BITS(pptr+1),
582 bgp_vpn_rd_print((u_char *)&route_target));
583
584 return 5 + (plen + 7) / 8;
585
586 trunc:
587 return -2;
588 }
589
590 static int
591 decode_labeled_vpn_prefix4(const u_char *pptr, char *buf, u_int buflen)
592 {
593 struct in_addr addr;
594 u_int plen;
595
596 TCHECK(pptr[0]);
597 plen = pptr[0]; /* get prefix length */
598
599 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
600
601 if (32 < plen)
602 return -1;
603
604 memset(&addr, 0, sizeof(addr));
605 TCHECK2(pptr[12], (plen + 7) / 8);
606 memcpy(&addr, &pptr[12], (plen + 7) / 8);
607 if (plen % 8) {
608 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
609 ((0xff00 >> (plen % 8)) & 0xff);
610 }
611 /* the label may get offsetted by 4 bits so lets shift it right */
612 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
613 bgp_vpn_rd_print(pptr+4),
614 getname((u_char *)&addr),
615 plen,
616 EXTRACT_24BITS(pptr+1)>>4,
617 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
618
619 return 12 + (plen + 7) / 8;
620
621 trunc:
622 return -2;
623 }
624
625 static int
626 decode_labeled_vpn_l2(const u_char *pptr, char *buf, u_int buflen)
627 {
628 int plen,tlen,strlen,tlv_type,tlv_len,ttlv_len;
629
630 TCHECK2(pptr[0], 2);
631 plen=EXTRACT_16BITS(pptr);
632 tlen=plen;
633 pptr+=2;
634 TCHECK2(pptr[0],15);
635 strlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
636 bgp_vpn_rd_print(pptr),
637 EXTRACT_16BITS(pptr+8),
638 EXTRACT_16BITS(pptr+10),
639 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
640 pptr+=15;
641 tlen-=15;
642
643 /* ok now the variable part - lets read out TLVs*/
644 while (tlen>0) {
645 if (tlen < 3)
646 return -1;
647 TCHECK2(pptr[0], 3);
648 tlv_type=*pptr++;
649 tlv_len=EXTRACT_16BITS(pptr);
650 ttlv_len=tlv_len;
651 pptr+=2;
652
653 switch(tlv_type) {
654 case 1:
655 strlen+=snprintf(buf+strlen,buflen-strlen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
656 tlv_type,
657 tlv_len);
658 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
659 while (ttlv_len>0) {
660 TCHECK(pptr[0]);
661 strlen+=snprintf(buf+strlen,buflen-strlen, "%02x",*pptr++);
662 ttlv_len--;
663 }
664 break;
665 default:
666 snprintf(buf+strlen,buflen-strlen, "\n\t\tunknown TLV #%u, length: %u",
667 tlv_type,
668 tlv_len);
669 break;
670 }
671 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it tright */
672 }
673 return plen+2;
674
675 trunc:
676 return -2;
677 }
678
679 #ifdef INET6
680 int
681 decode_prefix6(const u_char *pd, char *buf, u_int buflen)
682 {
683 struct in6_addr addr;
684 u_int plen;
685
686 TCHECK(pd[0]);
687 plen = pd[0];
688 if (128 < plen)
689 return -1;
690
691 memset(&addr, 0, sizeof(addr));
692 TCHECK2(pd[1], (plen + 7) / 8);
693 memcpy(&addr, &pd[1], (plen + 7) / 8);
694 if (plen % 8) {
695 addr.s6_addr[(plen + 7) / 8 - 1] &=
696 ((0xff00 >> (plen % 8)) & 0xff);
697 }
698 snprintf(buf, buflen, "%s/%d", getname6((u_char *)&addr), plen);
699 return 1 + (plen + 7) / 8;
700
701 trunc:
702 return -2;
703 }
704
705 static int
706 decode_labeled_prefix6(const u_char *pptr, char *buf, u_int buflen)
707 {
708 struct in6_addr addr;
709 u_int plen;
710
711 TCHECK(pptr[0]);
712 plen = pptr[0]; /* get prefix length */
713 plen-=24; /* adjust prefixlen - labellength */
714
715 if (128 < plen)
716 return -1;
717
718 memset(&addr, 0, sizeof(addr));
719 TCHECK2(pptr[4], (plen + 7) / 8);
720 memcpy(&addr, &pptr[4], (plen + 7) / 8);
721 if (plen % 8) {
722 addr.s6_addr[(plen + 7) / 8 - 1] &=
723 ((0xff00 >> (plen % 8)) & 0xff);
724 }
725 /* the label may get offsetted by 4 bits so lets shift it right */
726 snprintf(buf, buflen, "%s/%d, label:%u %s",
727 getname6((u_char *)&addr),
728 plen,
729 EXTRACT_24BITS(pptr+1)>>4,
730 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
731
732 return 4 + (plen + 7) / 8;
733
734 trunc:
735 return -2;
736 }
737
738 static int
739 decode_labeled_vpn_prefix6(const u_char *pptr, char *buf, u_int buflen)
740 {
741 struct in6_addr addr;
742 u_int plen;
743
744 TCHECK(pptr[0]);
745 plen = pptr[0]; /* get prefix length */
746
747 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
748
749 if (128 < plen)
750 return -1;
751
752 memset(&addr, 0, sizeof(addr));
753 TCHECK2(pptr[12], (plen + 7) / 8);
754 memcpy(&addr, &pptr[12], (plen + 7) / 8);
755 if (plen % 8) {
756 addr.s6_addr[(plen + 7) / 8 - 1] &=
757 ((0xff00 >> (plen % 8)) & 0xff);
758 }
759 /* the label may get offsetted by 4 bits so lets shift it right */
760 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
761 bgp_vpn_rd_print(pptr+4),
762 getname6((u_char *)&addr),
763 plen,
764 EXTRACT_24BITS(pptr+1)>>4,
765 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
766
767 return 12 + (plen + 7) / 8;
768
769 trunc:
770 return -2;
771 }
772 #endif
773
774 static int
775 bgp_attr_print(const struct bgp_attr *attr, const u_char *pptr, int len)
776 {
777 int i;
778 u_int16_t af;
779 u_int8_t safi, snpa;
780 union { /* copy buffer for bandwidth values */
781 float f;
782 u_int32_t i;
783 } bw;
784 int advance;
785 int tlen;
786 const u_char *tptr;
787 char buf[MAXHOSTNAMELEN + 100];
788 char tokbuf[TOKBUFSIZE];
789
790 tptr = pptr;
791 tlen=len;
792
793 switch (attr->bgpa_type) {
794 case BGPTYPE_ORIGIN:
795 if (len != 1)
796 printf("invalid len");
797 else {
798 TCHECK(*tptr);
799 printf("%s", tok2strbuf(bgp_origin_values,
800 "Unknown Origin Typecode",
801 tptr[0],
802 tokbuf, sizeof(tokbuf)));
803 }
804 break;
805
806 case BGPTYPE_AS_PATH:
807 if (len % 2) {
808 printf("invalid len");
809 break;
810 }
811 if (!len) {
812 printf("empty");
813 break;
814 }
815
816 while (tptr < pptr + len) {
817 TCHECK(tptr[0]);
818 printf("%s", tok2strbuf(bgp_as_path_segment_open_values,
819 "?", tptr[0],
820 tokbuf, sizeof(tokbuf)));
821 for (i = 0; i < tptr[1] * 2; i += 2) {
822 TCHECK2(tptr[2 + i], 2);
823 printf("%u ", EXTRACT_16BITS(&tptr[2 + i]));
824 }
825 TCHECK(tptr[0]);
826 printf("%s", tok2strbuf(bgp_as_path_segment_close_values,
827 "?", tptr[0],
828 tokbuf, sizeof(tokbuf)));
829 TCHECK(tptr[1]);
830 tptr += 2 + tptr[1] * 2;
831 }
832 break;
833 case BGPTYPE_NEXT_HOP:
834 if (len != 4)
835 printf("invalid len");
836 else {
837 TCHECK2(tptr[0], 4);
838 printf("%s", getname(tptr));
839 }
840 break;
841 case BGPTYPE_MULTI_EXIT_DISC:
842 case BGPTYPE_LOCAL_PREF:
843 if (len != 4)
844 printf("invalid len");
845 else {
846 TCHECK2(tptr[0], 4);
847 printf("%u", EXTRACT_32BITS(tptr));
848 }
849 break;
850 case BGPTYPE_ATOMIC_AGGREGATE:
851 if (len != 0)
852 printf("invalid len");
853 break;
854 case BGPTYPE_AGGREGATOR:
855 if (len != 6) {
856 printf("invalid len");
857 break;
858 }
859 TCHECK2(tptr[0], 6);
860 printf(" AS #%u, origin %s", EXTRACT_16BITS(tptr),
861 getname(tptr + 2));
862 break;
863 case BGPTYPE_COMMUNITIES:
864 if (len % 4) {
865 printf("invalid len");
866 break;
867 }
868 while (tlen>0) {
869 u_int32_t comm;
870 TCHECK2(tptr[0], 4);
871 comm = EXTRACT_32BITS(tptr);
872 switch (comm) {
873 case BGP_COMMUNITY_NO_EXPORT:
874 printf(" NO_EXPORT");
875 break;
876 case BGP_COMMUNITY_NO_ADVERT:
877 printf(" NO_ADVERTISE");
878 break;
879 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
880 printf(" NO_EXPORT_SUBCONFED");
881 break;
882 default:
883 printf("%u:%u%s",
884 (comm >> 16) & 0xffff,
885 comm & 0xffff,
886 (tlen>4) ? ", " : "");
887 break;
888 }
889 tlen -=4;
890 tptr +=4;
891 }
892 break;
893 case BGPTYPE_ORIGINATOR_ID:
894 if (len != 4) {
895 printf("invalid len");
896 break;
897 }
898 TCHECK2(tptr[0], 4);
899 printf("%s",getname(tptr));
900 break;
901 case BGPTYPE_CLUSTER_LIST:
902 if (len % 4) {
903 printf("invalid len");
904 break;
905 }
906 while (tlen>0) {
907 TCHECK2(tptr[0], 4);
908 printf("%s%s",
909 getname(tptr),
910 (tlen>4) ? ", " : "");
911 tlen -=4;
912 tptr +=4;
913 }
914 break;
915 case BGPTYPE_MP_REACH_NLRI:
916 TCHECK2(tptr[0], 3);
917 af = EXTRACT_16BITS(tptr);
918 safi = tptr[2];
919
920 printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
921 tok2strbuf(bgp_afi_values, "Unknown AFI", af,
922 tokbuf, sizeof(tokbuf)),
923 af,
924 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
925 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi,
926 tokbuf, sizeof(tokbuf)),
927 safi);
928
929 if (af == AFNUM_INET || af==AFNUM_L2VPN)
930 ;
931 #ifdef INET6
932 else if (af == AFNUM_INET6)
933 ;
934 #endif
935 else {
936 printf("\n\t no AFI %u decoder",af);
937 if (vflag <= 1)
938 print_unknown_data(tptr,"\n\t ",tlen);
939 break;
940 }
941
942 tptr +=3;
943
944 TCHECK(tptr[0]);
945 tlen = tptr[0];
946 tptr++;
947
948 if (tlen) {
949 printf("\n\t nexthop: ");
950 while (tlen > 0) {
951 switch (af) {
952 case AFNUM_INET:
953 switch(safi) {
954 case SAFNUM_UNICAST:
955 case SAFNUM_MULTICAST:
956 case SAFNUM_UNIMULTICAST:
957 case SAFNUM_LABUNICAST:
958 case SAFNUM_RT_ROUTING_INFO:
959 if (tlen < (int)sizeof(struct in_addr)) {
960 printf("invalid len");
961 tlen = 0;
962 } else {
963 TCHECK2(tptr[0], sizeof(struct in_addr));
964 printf("%s",getname(tptr));
965 tlen -= sizeof(struct in_addr);
966 tptr += sizeof(struct in_addr);
967 }
968 break;
969 case SAFNUM_VPNUNICAST:
970 case SAFNUM_VPNMULTICAST:
971 case SAFNUM_VPNUNIMULTICAST:
972 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) {
973 printf("invalid len");
974 tlen = 0;
975 } else {
976 TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN);
977 printf("RD: %s, %s",
978 bgp_vpn_rd_print(tptr),
979 getname(tptr+BGP_VPN_RD_LEN));
980 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
981 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
982 }
983 break;
984 default:
985 TCHECK2(tptr[0], tlen);
986 printf("no SAFI %u decoder",safi);
987 if (vflag <= 1)
988 print_unknown_data(tptr,"\n\t ",tlen);
989 tptr += tlen;
990 tlen = 0;
991 break;
992 }
993 break;
994 #ifdef INET6
995 case AFNUM_INET6:
996 switch(safi) {
997 case SAFNUM_UNICAST:
998 case SAFNUM_MULTICAST:
999 case SAFNUM_UNIMULTICAST:
1000 case SAFNUM_LABUNICAST:
1001 case SAFNUM_RT_ROUTING_INFO:
1002 if (tlen < (int)sizeof(struct in6_addr)) {
1003 printf("invalid len");
1004 tlen = 0;
1005 } else {
1006 TCHECK2(tptr[0], sizeof(struct in6_addr));
1007 printf("%s", getname6(tptr));
1008 tlen -= sizeof(struct in6_addr);
1009 tptr += sizeof(struct in6_addr);
1010 }
1011 break;
1012 case SAFNUM_VPNUNICAST:
1013 case SAFNUM_VPNMULTICAST:
1014 case SAFNUM_VPNUNIMULTICAST:
1015 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) {
1016 printf("invalid len");
1017 tlen = 0;
1018 } else {
1019 TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1020 printf("RD: %s, %s",
1021 bgp_vpn_rd_print(tptr),
1022 getname6(tptr+BGP_VPN_RD_LEN));
1023 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1024 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1025 }
1026 break;
1027 default:
1028 TCHECK2(tptr[0], tlen);
1029 printf("no SAFI %u decoder",safi);
1030 if (vflag <= 1)
1031 print_unknown_data(tptr,"\n\t ",tlen);
1032 tptr += tlen;
1033 tlen = 0;
1034 break;
1035 }
1036 break;
1037 #endif
1038 case AFNUM_L2VPN:
1039 switch(safi) {
1040 case SAFNUM_VPNUNICAST:
1041 case SAFNUM_VPNMULTICAST:
1042 case SAFNUM_VPNUNIMULTICAST:
1043 if (tlen < (int)sizeof(struct in_addr)) {
1044 printf("invalid len");
1045 tlen = 0;
1046 } else {
1047 TCHECK2(tptr[0], sizeof(struct in_addr));
1048 printf("%s", getname(tptr));
1049 tlen -= (sizeof(struct in_addr));
1050 tptr += (sizeof(struct in_addr));
1051 }
1052 break;
1053 default:
1054 TCHECK2(tptr[0], tlen);
1055 printf("no SAFI %u decoder",safi);
1056 if (vflag <= 1)
1057 print_unknown_data(tptr,"\n\t ",tlen);
1058 tptr += tlen;
1059 tlen = 0;
1060 break;
1061 }
1062 break;
1063
1064 default:
1065 TCHECK2(tptr[0], tlen);
1066 printf("no AFI %u decoder",af);
1067 if (vflag <= 1)
1068 print_unknown_data(tptr,"\n\t ",tlen);
1069 tptr += tlen;
1070 tlen = 0;
1071 break;
1072 }
1073 }
1074 }
1075 tptr += tlen;
1076
1077 TCHECK(tptr[0]);
1078 snpa = tptr[0];
1079 tptr++;
1080
1081 if (snpa) {
1082 printf("\n\t %u SNPA", snpa);
1083 for (/*nothing*/; snpa > 0; snpa--) {
1084 TCHECK(tptr[0]);
1085 printf("\n\t %d bytes", tptr[0]);
1086 tptr += tptr[0] + 1;
1087 }
1088 } else {
1089 printf(", no SNPA");
1090 }
1091
1092 while (len - (tptr - pptr) > 0) {
1093 switch (af) {
1094 case AFNUM_INET:
1095 switch (safi) {
1096 case SAFNUM_UNICAST:
1097 case SAFNUM_MULTICAST:
1098 case SAFNUM_UNIMULTICAST:
1099 advance = decode_prefix4(tptr, buf, sizeof(buf));
1100 if (advance == -1)
1101 printf("\n\t (illegal prefix length)");
1102 else if (advance == -2)
1103 goto trunc;
1104 else
1105 printf("\n\t %s", buf);
1106 break;
1107 case SAFNUM_LABUNICAST:
1108 advance = decode_labeled_prefix4(tptr, buf, sizeof(buf));
1109 if (advance == -1)
1110 printf("\n\t (illegal prefix length)");
1111 else if (advance == -2)
1112 goto trunc;
1113 else
1114 printf("\n\t %s", buf);
1115 break;
1116 case SAFNUM_VPNUNICAST:
1117 case SAFNUM_VPNMULTICAST:
1118 case SAFNUM_VPNUNIMULTICAST:
1119 advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf));
1120 if (advance == -1)
1121 printf("\n\t (illegal prefix length)");
1122 else if (advance == -2)
1123 goto trunc;
1124 else
1125 printf("\n\t %s", buf);
1126 break;
1127 case SAFNUM_RT_ROUTING_INFO:
1128 advance = decode_rt_routing_info(tptr, buf, sizeof(buf));
1129 if (advance == -1)
1130 printf("\n\t (illegal prefix length)");
1131 else if (advance == -2)
1132 goto trunc;
1133 else
1134 printf("\n\t %s", buf);
1135 break;
1136 default:
1137 TCHECK2(*(tptr-3),tlen);
1138 printf("\n\t no SAFI %u decoder",safi);
1139 if (vflag <= 1)
1140 print_unknown_data(tptr-3,"\n\t ",tlen);
1141 advance = 0;
1142 tptr = pptr + len;
1143 break;
1144 }
1145 break;
1146 #ifdef INET6
1147 case AFNUM_INET6:
1148 switch (safi) {
1149 case SAFNUM_UNICAST:
1150 case SAFNUM_MULTICAST:
1151 case SAFNUM_UNIMULTICAST:
1152 advance = decode_prefix6(tptr, buf, sizeof(buf));
1153 if (advance == -1)
1154 printf("\n\t (illegal prefix length)");
1155 else if (advance == -2)
1156 goto trunc;
1157 else
1158 printf("\n\t %s", buf);
1159 break;
1160 case SAFNUM_LABUNICAST:
1161 advance = decode_labeled_prefix6(tptr, buf, sizeof(buf));
1162 if (advance == -1)
1163 printf("\n\t (illegal prefix length)");
1164 else if (advance == -2)
1165 goto trunc;
1166 else
1167 printf("\n\t %s", buf);
1168 break;
1169 case SAFNUM_VPNUNICAST:
1170 case SAFNUM_VPNMULTICAST:
1171 case SAFNUM_VPNUNIMULTICAST:
1172 advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf));
1173 if (advance == -1)
1174 printf("\n\t (illegal prefix length)");
1175 else if (advance == -2)
1176 goto trunc;
1177 else
1178 printf("\n\t %s", buf);
1179 break;
1180 case SAFNUM_RT_ROUTING_INFO:
1181 advance = decode_rt_routing_info(tptr, buf, sizeof(buf));
1182 if (advance == -1)
1183 printf("\n\t (illegal prefix length)");
1184 else if (advance == -2)
1185 goto trunc;
1186 else
1187 printf("\n\t %s", buf);
1188 break;
1189 default:
1190 TCHECK2(*(tptr-3),tlen);
1191 printf("\n\t no SAFI %u decoder ",safi);
1192 if (vflag <= 1)
1193 print_unknown_data(tptr-3,"\n\t ",tlen);
1194 advance = 0;
1195 tptr = pptr + len;
1196 break;
1197 }
1198 break;
1199 #endif
1200 case AFNUM_L2VPN:
1201 switch(safi) {
1202 case SAFNUM_VPNUNICAST:
1203 case SAFNUM_VPNMULTICAST:
1204 case SAFNUM_VPNUNIMULTICAST:
1205 advance = decode_labeled_vpn_l2(tptr, buf, sizeof(buf));
1206 if (advance == -1)
1207 printf("\n\t (illegal length)");
1208 else if (advance == -2)
1209 goto trunc;
1210 else
1211 printf("\n\t %s", buf);
1212 break;
1213 default:
1214 TCHECK2(*tptr,tlen);
1215 printf("no SAFI %u decoder",safi);
1216 if (vflag <= 1)
1217 print_unknown_data(tptr,"\n\t ",tlen);
1218 advance = 0;
1219 tptr = pptr + len;
1220 break;
1221 }
1222 break;
1223
1224
1225 default:
1226 TCHECK2(*(tptr-3),tlen);
1227 printf("\n\t no AFI %u decoder ",af);
1228 if (vflag <= 1)
1229 print_unknown_data(tptr-3,"\n\t ",tlen);
1230 advance = 0;
1231 tptr = pptr + len;
1232 break;
1233 }
1234 tptr += advance;
1235 }
1236 break;
1237
1238 case BGPTYPE_MP_UNREACH_NLRI:
1239 TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE);
1240 af = EXTRACT_16BITS(tptr);
1241 safi = tptr[2];
1242
1243 printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1244 tok2strbuf(bgp_afi_values, "Unknown AFI", af,
1245 tokbuf, sizeof(tokbuf)),
1246 af,
1247 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1248 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi,
1249 tokbuf, sizeof(tokbuf)),
1250 safi);
1251
1252 if (len == BGP_MP_NLRI_MINSIZE)
1253 printf("\n\t End-of-Rib Marker (empty NLRI)");
1254
1255 tptr += 3;
1256
1257 while (len - (tptr - pptr) > 0) {
1258 switch (af) {
1259 case AFNUM_INET:
1260 switch (safi) {
1261 case SAFNUM_UNICAST:
1262 case SAFNUM_MULTICAST:
1263 case SAFNUM_UNIMULTICAST:
1264 advance = decode_prefix4(tptr, buf, sizeof(buf));
1265 if (advance == -1)
1266 printf("\n\t (illegal prefix length)");
1267 else if (advance == -2)
1268 goto trunc;
1269 else
1270 printf("\n\t %s", buf);
1271 break;
1272 case SAFNUM_LABUNICAST:
1273 advance = decode_labeled_prefix4(tptr, buf, sizeof(buf));
1274 if (advance == -1)
1275 printf("\n\t (illegal prefix length)");
1276 else if (advance == -2)
1277 goto trunc;
1278 else
1279 printf("\n\t %s", buf);
1280 break;
1281 case SAFNUM_VPNUNICAST:
1282 case SAFNUM_VPNMULTICAST:
1283 case SAFNUM_VPNUNIMULTICAST:
1284 advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf));
1285 if (advance == -1)
1286 printf("\n\t (illegal prefix length)");
1287 else if (advance == -2)
1288 goto trunc;
1289 else
1290 printf("\n\t %s", buf);
1291 break;
1292 default:
1293 TCHECK2(*(tptr-3),tlen);
1294 printf("\n\t no SAFI %u decoder",safi);
1295 if (vflag <= 1)
1296 print_unknown_data(tptr-3,"\n\t ",tlen);
1297 advance = 0;
1298 tptr = pptr + len;
1299 break;
1300 }
1301 break;
1302
1303 #ifdef INET6
1304 case AFNUM_INET6:
1305 switch (safi) {
1306 case SAFNUM_UNICAST:
1307 case SAFNUM_MULTICAST:
1308 case SAFNUM_UNIMULTICAST:
1309 advance = decode_prefix6(tptr, buf, sizeof(buf));
1310 if (advance == -1)
1311 printf("\n\t (illegal prefix length)");
1312 else if (advance == -2)
1313 goto trunc;
1314 else
1315 printf("\n\t %s", buf);
1316 break;
1317 case SAFNUM_LABUNICAST:
1318 advance = decode_labeled_prefix6(tptr, buf, sizeof(buf));
1319 if (advance == -1)
1320 printf("\n\t (illegal prefix length)");
1321 else if (advance == -2)
1322 goto trunc;
1323 else
1324 printf("\n\t %s", buf);
1325 break;
1326 case SAFNUM_VPNUNICAST:
1327 case SAFNUM_VPNMULTICAST:
1328 case SAFNUM_VPNUNIMULTICAST:
1329 advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf));
1330 if (advance == -1)
1331 printf("\n\t (illegal prefix length)");
1332 else if (advance == -2)
1333 goto trunc;
1334 else
1335 printf("\n\t %s", buf);
1336 break;
1337 default:
1338 TCHECK2(*(tptr-3),tlen);
1339 printf("\n\t no SAFI %u decoder",safi);
1340 if (vflag <= 1)
1341 print_unknown_data(tptr-3,"\n\t ",tlen);
1342 advance = 0;
1343 tptr = pptr + len;
1344 break;
1345 }
1346 break;
1347 #endif
1348
1349 case AFNUM_L2VPN:
1350 switch(safi) {
1351 case SAFNUM_VPNUNICAST:
1352 case SAFNUM_VPNMULTICAST:
1353 case SAFNUM_VPNUNIMULTICAST:
1354 advance = decode_labeled_vpn_l2(tptr, buf, sizeof(buf));
1355 if (advance == -1)
1356 printf("\n\t (illegal length)");
1357 else if (advance == -2)
1358 goto trunc;
1359 else
1360 printf("\n\t %s", buf);
1361 break;
1362 default:
1363 TCHECK2(*(tptr-3),tlen);
1364 printf("no SAFI %u decoder",safi);
1365 if (vflag <= 1)
1366 print_unknown_data(tptr-3,"\n\t ",tlen);
1367 advance = 0;
1368 tptr = pptr + len;
1369 break;
1370 }
1371 break;
1372
1373 default:
1374 TCHECK2(*(tptr-3),tlen);
1375 printf("\n\t no AFI %u decoder",af);
1376 if (vflag <= 1)
1377 print_unknown_data(tptr-3,"\n\t ",tlen);
1378 advance = 0;
1379 tptr = pptr + len;
1380 break;
1381 }
1382
1383 tptr += advance;
1384 }
1385 break;
1386 case BGPTYPE_EXTD_COMMUNITIES:
1387 if (len % 8) {
1388 printf("invalid len");
1389 break;
1390 }
1391 while (tlen>0) {
1392 u_int16_t extd_comm;
1393
1394 TCHECK2(tptr[0], 2);
1395 extd_comm=EXTRACT_16BITS(tptr);
1396
1397 printf("\n\t %s (0x%04x), Flags [%s]",
1398 tok2strbuf(bgp_extd_comm_subtype_values,
1399 "unknown extd community typecode",
1400 extd_comm, tokbuf, sizeof(tokbuf)),
1401 extd_comm,
1402 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm));
1403
1404 TCHECK2(*(tptr+2), 6);
1405 switch(extd_comm) {
1406 case BGP_EXT_COM_RT_0:
1407 case BGP_EXT_COM_RO_0:
1408 printf(": %u:%s",
1409 EXTRACT_16BITS(tptr+2),
1410 getname(tptr+4));
1411 break;
1412 case BGP_EXT_COM_RT_1:
1413 case BGP_EXT_COM_RO_1:
1414 printf(": %s:%u",
1415 getname(tptr+2),
1416 EXTRACT_16BITS(tptr+6));
1417 break;
1418 case BGP_EXT_COM_RT_2:
1419 case BGP_EXT_COM_RO_2:
1420 printf(": %u:%u",
1421 EXTRACT_32BITS(tptr+2),
1422 EXTRACT_16BITS(tptr+6));
1423 break;
1424 case BGP_EXT_COM_LINKBAND:
1425 bw.i = EXTRACT_32BITS(tptr+2);
1426 printf(": bandwidth: %.3f Mbps",
1427 bw.f*8/1000000);
1428 break;
1429 case BGP_EXT_COM_CISCO_MCAST:
1430 printf(": AS %u, group %s",
1431 EXTRACT_16BITS(tptr+2),
1432 getname(tptr+4));
1433 break;
1434 case BGP_EXT_COM_VPN_ORIGIN:
1435 case BGP_EXT_COM_VPN_ORIGIN2:
1436 case BGP_EXT_COM_VPN_ORIGIN3:
1437 case BGP_EXT_COM_VPN_ORIGIN4:
1438 case BGP_EXT_COM_OSPF_RID:
1439 case BGP_EXT_COM_OSPF_RID2:
1440 printf("%s", getname(tptr+2));
1441 break;
1442 case BGP_EXT_COM_OSPF_RTYPE:
1443 case BGP_EXT_COM_OSPF_RTYPE2:
1444 printf(": area:%s, router-type:%s, metric-type:%s%s",
1445 getname(tptr+2),
1446 tok2strbuf(bgp_extd_comm_ospf_rtype_values,
1447 "unknown (0x%02x)",
1448 *(tptr+6),
1449 tokbuf, sizeof(tokbuf)),
1450 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
1451 (*(tptr+6) == (BGP_OSPF_RTYPE_EXT ||BGP_OSPF_RTYPE_NSSA )) ? "E1" : "");
1452 break;
1453 case BGP_EXT_COM_L2INFO:
1454 printf(": %s Control Flags [0x%02x]:MTU %u",
1455 tok2strbuf(l2vpn_encaps_values,
1456 "unknown encaps",
1457 *(tptr+2),
1458 tokbuf, sizeof(tokbuf)),
1459 *(tptr+3),
1460 EXTRACT_16BITS(tptr+4));
1461 break;
1462 default:
1463 print_unknown_data(tptr,"\n\t ",8);
1464 break;
1465 }
1466 tlen -=8;
1467 tptr +=8;
1468 }
1469 break;
1470
1471 case BGPTYPE_ATTR_SET:
1472 TCHECK2(tptr[0], 4);
1473 printf("\n\t Origin AS: %u", EXTRACT_32BITS(tptr));
1474 tptr+=4;
1475 len -=4;
1476
1477 while (len >= 2 ) {
1478 int alen;
1479 struct bgp_attr bgpa;
1480
1481 TCHECK2(tptr[0], sizeof(bgpa));
1482 memcpy(&bgpa, tptr, sizeof(bgpa));
1483 alen = bgp_attr_len(&bgpa);
1484 tptr += bgp_attr_off(&bgpa);
1485 len -= bgp_attr_off(&bgpa);
1486
1487 printf("\n\t %s (%u), length: %u",
1488 tok2strbuf(bgp_attr_values,
1489 "Unknown Attribute", bgpa.bgpa_type,
1490 tokbuf, sizeof(tokbuf)),
1491 bgpa.bgpa_type,
1492 alen);
1493
1494 if (bgpa.bgpa_flags) {
1495 printf(", Flags [%s%s%s%s",
1496 bgpa.bgpa_flags & 0x80 ? "O" : "",
1497 bgpa.bgpa_flags & 0x40 ? "T" : "",
1498 bgpa.bgpa_flags & 0x20 ? "P" : "",
1499 bgpa.bgpa_flags & 0x10 ? "E" : "");
1500 if (bgpa.bgpa_flags & 0xf)
1501 printf("+%x", bgpa.bgpa_flags & 0xf);
1502 printf("]: ");
1503 }
1504 /* FIXME check for recursion */
1505 if (!bgp_attr_print(&bgpa, tptr, alen))
1506 return 0;
1507 tptr += alen;
1508 len -= alen;
1509 }
1510 break;
1511
1512
1513 default:
1514 TCHECK2(*pptr,len);
1515 printf("\n\t no Attribute %u decoder",attr->bgpa_type); /* we have no decoder for the attribute */
1516 if (vflag <= 1)
1517 print_unknown_data(pptr,"\n\t ",len);
1518 break;
1519 }
1520 if (vflag > 1 && len) /* omit zero length attributes*/
1521 print_unknown_data(pptr,"\n\t ",len);
1522 return 1;
1523
1524 trunc:
1525 return 0;
1526 }
1527
1528 static void
1529 bgp_open_print(const u_char *dat, int length)
1530 {
1531 struct bgp_open bgpo;
1532 struct bgp_opt bgpopt;
1533 int hlen;
1534 const u_char *opt;
1535 int i,cap_type,cap_len,tcap_len,cap_offset;
1536 char tokbuf[TOKBUFSIZE];
1537 char tokbuf2[TOKBUFSIZE];
1538
1539 TCHECK2(dat[0], BGP_OPEN_SIZE);
1540 memcpy(&bgpo, dat, BGP_OPEN_SIZE);
1541 hlen = ntohs(bgpo.bgpo_len);
1542
1543 printf("\n\t Version %d, ", bgpo.bgpo_version);
1544 printf("my AS %u, ", ntohs(bgpo.bgpo_myas));
1545 printf("Holdtime %us, ", ntohs(bgpo.bgpo_holdtime));
1546 printf("ID %s", getname((u_char *)&bgpo.bgpo_id));
1547 printf("\n\t Optional parameters, length: %u", bgpo.bgpo_optlen);
1548
1549 /* some little sanity checking */
1550 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE)
1551 return;
1552
1553 /* ugly! */
1554 opt = &((const struct bgp_open *)dat)->bgpo_optlen;
1555 opt++;
1556
1557 i = 0;
1558 while (i < bgpo.bgpo_optlen) {
1559 TCHECK2(opt[i], BGP_OPT_SIZE);
1560 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE);
1561 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
1562 printf("\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len);
1563 break;
1564 }
1565
1566 printf("\n\t Option %s (%u), length: %u",
1567 tok2strbuf(bgp_opt_values,"Unknown",
1568 bgpopt.bgpopt_type,
1569 tokbuf, sizeof(tokbuf)),
1570 bgpopt.bgpopt_type,
1571 bgpopt.bgpopt_len);
1572
1573 /* now lets decode the options we know*/
1574 switch(bgpopt.bgpopt_type) {
1575 case BGP_OPT_CAP:
1576 cap_type=opt[i+BGP_OPT_SIZE];
1577 cap_len=opt[i+BGP_OPT_SIZE+1];
1578 tcap_len=cap_len;
1579 printf("\n\t %s (%u), length: %u",
1580 tok2strbuf(bgp_capcode_values, "Unknown",
1581 cap_type, tokbuf, sizeof(tokbuf)),
1582 cap_type,
1583 cap_len);
1584 switch(cap_type) {
1585 case BGP_CAPCODE_MP:
1586 printf("\n\t\tAFI %s (%u), SAFI %s (%u)",
1587 tok2strbuf(bgp_afi_values, "Unknown",
1588 EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2),
1589 tokbuf, sizeof(tokbuf)),
1590 EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2),
1591 tok2strbuf(bgp_safi_values, "Unknown",
1592 opt[i+BGP_OPT_SIZE+5],
1593 tokbuf, sizeof(tokbuf)),
1594 opt[i+BGP_OPT_SIZE+5]);
1595 break;
1596 case BGP_CAPCODE_RESTART:
1597 printf("\n\t\tRestart Flags: [%s], Restart Time %us",
1598 ((opt[i+BGP_OPT_SIZE+2])&0x80) ? "R" : "none",
1599 EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2)&0xfff);
1600 tcap_len-=2;
1601 cap_offset=4;
1602 while(tcap_len>=4) {
1603 printf("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
1604 tok2strbuf(bgp_afi_values,"Unknown",
1605 EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+cap_offset),
1606 tokbuf, sizeof(tokbuf)),
1607 EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+cap_offset),
1608 tok2strbuf(bgp_safi_values,"Unknown",
1609 opt[i+BGP_OPT_SIZE+cap_offset+2],
1610 tokbuf2, sizeof(tokbuf2)),
1611 opt[i+BGP_OPT_SIZE+cap_offset+2],
1612 ((opt[i+BGP_OPT_SIZE+cap_offset+3])&0x80) ? "yes" : "no" );
1613 tcap_len-=4;
1614 cap_offset+=4;
1615 }
1616 break;
1617 case BGP_CAPCODE_RR:
1618 case BGP_CAPCODE_RR_CISCO:
1619 break;
1620 default:
1621 printf("\n\t\tno decoder for Capability %u",
1622 cap_type);
1623 if (vflag <= 1)
1624 print_unknown_data(&opt[i+BGP_OPT_SIZE+2],"\n\t\t",cap_len);
1625 break;
1626 }
1627 if (vflag > 1)
1628 print_unknown_data(&opt[i+BGP_OPT_SIZE+2],"\n\t\t",cap_len);
1629 break;
1630 case BGP_OPT_AUTH:
1631 default:
1632 printf("\n\t no decoder for option %u",
1633 bgpopt.bgpopt_type);
1634 break;
1635 }
1636
1637 i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
1638 }
1639 return;
1640 trunc:
1641 printf("[|BGP]");
1642 }
1643
1644 static void
1645 bgp_update_print(const u_char *dat, int length)
1646 {
1647 struct bgp bgp;
1648 struct bgp_attr bgpa;
1649 int hlen;
1650 const u_char *p;
1651 int len;
1652 int i;
1653 char tokbuf[TOKBUFSIZE];
1654
1655 TCHECK2(dat[0], BGP_SIZE);
1656 memcpy(&bgp, dat, BGP_SIZE);
1657 hlen = ntohs(bgp.bgp_len);
1658 p = dat + BGP_SIZE; /*XXX*/
1659
1660 /* Unfeasible routes */
1661 len = EXTRACT_16BITS(p);
1662 if (len) {
1663 /*
1664 * Without keeping state from the original NLRI message,
1665 * it's not possible to tell if this a v4 or v6 route,
1666 * so only try to decode it if we're not v6 enabled.
1667 */
1668 #ifdef INET6
1669 printf("\n\t Withdrawn routes: %d bytes", len);
1670 #else
1671 char buf[MAXHOSTNAMELEN + 100];
1672 int wpfx;
1673
1674 TCHECK2(p[2], len);
1675 i = 2;
1676
1677 printf("\n\t Withdrawn routes:");
1678
1679 while(i < 2 + len) {
1680 wpfx = decode_prefix4(&p[i], buf, sizeof(buf));
1681 if (wpfx == -1) {
1682 printf("\n\t (illegal prefix length)");
1683 break;
1684 } else if (wpfx == -2)
1685 goto trunc;
1686 else {
1687 i += wpfx;
1688 printf("\n\t %s", buf);
1689 }
1690 }
1691 #endif
1692 }
1693 p += 2 + len;
1694
1695 TCHECK2(p[0], 2);
1696 len = EXTRACT_16BITS(p);
1697
1698 if (len == 0 && length == BGP_UPDATE_MINSIZE) {
1699 printf("\n\t End-of-Rib Marker (empty NLRI)");
1700 return;
1701 }
1702
1703 if (len) {
1704 /* do something more useful!*/
1705 i = 2;
1706 while (i < 2 + len) {
1707 int alen, aoff;
1708
1709 TCHECK2(p[i], sizeof(bgpa));
1710 memcpy(&bgpa, &p[i], sizeof(bgpa));
1711 alen = bgp_attr_len(&bgpa);
1712 aoff = bgp_attr_off(&bgpa);
1713
1714 printf("\n\t %s (%u), length: %u",
1715 tok2strbuf(bgp_attr_values, "Unknown Attribute",
1716 bgpa.bgpa_type,
1717 tokbuf, sizeof(tokbuf)),
1718 bgpa.bgpa_type,
1719 alen);
1720
1721 if (bgpa.bgpa_flags) {
1722 printf(", Flags [%s%s%s%s",
1723 bgpa.bgpa_flags & 0x80 ? "O" : "",
1724 bgpa.bgpa_flags & 0x40 ? "T" : "",
1725 bgpa.bgpa_flags & 0x20 ? "P" : "",
1726 bgpa.bgpa_flags & 0x10 ? "E" : "");
1727 if (bgpa.bgpa_flags & 0xf)
1728 printf("+%x", bgpa.bgpa_flags & 0xf);
1729 printf("]: ");
1730 }
1731 if (!bgp_attr_print(&bgpa, &p[i + aoff], alen))
1732 goto trunc;
1733 i += aoff + alen;
1734 }
1735 }
1736 p += 2 + len;
1737
1738 if (dat + length > p) {
1739 printf("\n\t Updated routes:");
1740 while (dat + length > p) {
1741 char buf[MAXHOSTNAMELEN + 100];
1742 i = decode_prefix4(p, buf, sizeof(buf));
1743 if (i == -1)
1744 printf("\n\t (illegal prefix length)");
1745 else if (i == -2)
1746 goto trunc;
1747 else {
1748 printf("\n\t %s", buf);
1749 p += i;
1750 }
1751 }
1752 }
1753 return;
1754 trunc:
1755 printf("[|BGP]");
1756 }
1757
1758 static void
1759 bgp_notification_print(const u_char *dat, int length)
1760 {
1761 struct bgp_notification bgpn;
1762 int hlen;
1763 const u_char *tptr;
1764 char tokbuf[TOKBUFSIZE];
1765 char tokbuf2[TOKBUFSIZE];
1766
1767 TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
1768 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
1769 hlen = ntohs(bgpn.bgpn_len);
1770
1771 /* some little sanity checking */
1772 if (length<BGP_NOTIFICATION_SIZE)
1773 return;
1774
1775 printf(", %s (%u)",
1776 tok2strbuf(bgp_notify_major_values, "Unknown Error",
1777 bgpn.bgpn_major, tokbuf, sizeof(tokbuf)),
1778 bgpn.bgpn_major);
1779
1780 switch (bgpn.bgpn_major) {
1781
1782 case BGP_NOTIFY_MAJOR_MSG:
1783 printf(", subcode %s (%u)",
1784 tok2strbuf(bgp_notify_minor_msg_values, "Unknown",
1785 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
1786 bgpn.bgpn_minor);
1787 break;
1788 case BGP_NOTIFY_MAJOR_OPEN:
1789 printf(", subcode %s (%u)",
1790 tok2strbuf(bgp_notify_minor_open_values, "Unknown",
1791 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
1792 bgpn.bgpn_minor);
1793 break;
1794 case BGP_NOTIFY_MAJOR_UPDATE:
1795 printf(", subcode %s (%u)",
1796 tok2strbuf(bgp_notify_minor_update_values, "Unknown",
1797 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
1798 bgpn.bgpn_minor);
1799 break;
1800 case BGP_NOTIFY_MAJOR_CAP:
1801 printf(" subcode %s (%u)",
1802 tok2strbuf(bgp_notify_minor_cap_values, "Unknown",
1803 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
1804 bgpn.bgpn_minor);
1805 case BGP_NOTIFY_MAJOR_CEASE:
1806 printf(", subcode %s (%u)",
1807 tok2strbuf(bgp_notify_minor_cease_values, "Unknown",
1808 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
1809 bgpn.bgpn_minor);
1810
1811 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
1812 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
1813 */
1814 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
1815 tptr = dat + BGP_NOTIFICATION_SIZE;
1816 TCHECK2(*tptr, 7);
1817 printf(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
1818 tok2strbuf(bgp_afi_values, "Unknown",
1819 EXTRACT_16BITS(tptr), tokbuf, sizeof(tokbuf)),
1820 EXTRACT_16BITS(tptr),
1821 tok2strbuf(bgp_safi_values, "Unknown", *(tptr+2),
1822 tokbuf2, sizeof(tokbuf)),
1823 *(tptr+2),
1824 EXTRACT_32BITS(tptr+3));
1825 }
1826 break;
1827 default:
1828 break;
1829 }
1830
1831 return;
1832 trunc:
1833 printf("[|BGP]");
1834 }
1835
1836 static void
1837 bgp_route_refresh_print(const u_char *pptr, int len) {
1838
1839 const struct bgp_route_refresh *bgp_route_refresh_header;
1840 char tokbuf[TOKBUFSIZE];
1841 char tokbuf2[TOKBUFSIZE];
1842
1843 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
1844
1845 printf("\n\t AFI %s (%u), SAFI %s (%u)",
1846 tok2strbuf(bgp_afi_values,"Unknown",
1847 /* this stinks but the compiler pads the structure
1848 * weird */
1849 EXTRACT_16BITS(&bgp_route_refresh_header->afi),
1850 tokbuf, sizeof(tokbuf)),
1851 EXTRACT_16BITS(&bgp_route_refresh_header->afi),
1852 tok2strbuf(bgp_safi_values,"Unknown",
1853 bgp_route_refresh_header->safi,
1854 tokbuf2, sizeof(tokbuf2)),
1855 bgp_route_refresh_header->safi);
1856
1857 if (vflag > 1)
1858 print_unknown_data(pptr,"\n\t ", len);
1859
1860 return;
1861 }
1862
1863 static int
1864 bgp_header_print(const u_char *dat, int length)
1865 {
1866 struct bgp bgp;
1867 char tokbuf[TOKBUFSIZE];
1868
1869 TCHECK2(dat[0], BGP_SIZE);
1870 memcpy(&bgp, dat, BGP_SIZE);
1871 printf("\n\t%s Message (%u), length: %u",
1872 tok2strbuf(bgp_msg_values, "Unknown", bgp.bgp_type,
1873 tokbuf, sizeof(tokbuf)),
1874 bgp.bgp_type,
1875 length);
1876
1877 switch (bgp.bgp_type) {
1878 case BGP_OPEN:
1879 bgp_open_print(dat, length);
1880 break;
1881 case BGP_UPDATE:
1882 bgp_update_print(dat, length);
1883 break;
1884 case BGP_NOTIFICATION:
1885 bgp_notification_print(dat, length);
1886 break;
1887 case BGP_KEEPALIVE:
1888 break;
1889 case BGP_ROUTE_REFRESH:
1890 bgp_route_refresh_print(dat, length);
1891 break;
1892 default:
1893 /* we have no decoder for the BGP message */
1894 printf("\n\t no Message %u decoder",bgp.bgp_type);
1895 print_unknown_data(dat,"\n\t ",length);
1896 break;
1897 }
1898 return 1;
1899 trunc:
1900 printf("[|BGP]");
1901 return 0;
1902 }
1903
1904 void
1905 bgp_print(const u_char *dat, int length)
1906 {
1907 const u_char *p;
1908 const u_char *ep;
1909 const u_char *start;
1910 const u_char marker[] = {
1911 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
1912 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
1913 };
1914 struct bgp bgp;
1915 u_int16_t hlen;
1916 char tokbuf[TOKBUFSIZE];
1917
1918 ep = dat + length;
1919 if (snapend < dat + length)
1920 ep = snapend;
1921
1922 printf(": BGP, length: %u",length);
1923
1924 if (vflag < 1) /* lets be less chatty */
1925 return;
1926
1927 p = dat;
1928 start = p;
1929 while (p < snapend) {
1930 if (!TTEST2(p[0], 1))
1931 break;
1932 if (p[0] != 0xff) {
1933 p++;
1934 continue;
1935 }
1936
1937 if (!TTEST2(p[0], sizeof(marker)))
1938 break;
1939 if (memcmp(p, marker, sizeof(marker)) != 0) {
1940 p++;
1941 continue;
1942 }
1943
1944 /* found BGP header */
1945 TCHECK2(p[0], BGP_SIZE); /*XXX*/
1946 memcpy(&bgp, p, BGP_SIZE);
1947
1948 if (start != p)
1949 printf(" [|BGP]");
1950
1951 hlen = ntohs(bgp.bgp_len);
1952 if (hlen < BGP_SIZE) {
1953 printf("\n[|BGP Bogus header length %u < %u]", hlen,
1954 BGP_SIZE);
1955 break;
1956 }
1957
1958 if (TTEST2(p[0], hlen)) {
1959 if (!bgp_header_print(p, hlen))
1960 return;
1961 p += hlen;
1962 start = p;
1963 } else {
1964 printf("\n[|BGP %s]",
1965 tok2strbuf(bgp_msg_values,
1966 "Unknown Message Type",
1967 bgp.bgp_type,
1968 tokbuf, sizeof(tokbuf)));
1969 break;
1970 }
1971 }
1972
1973 return;
1974
1975 trunc:
1976 printf(" [|BGP]");
1977 }
[mirror] the TCPdump network dissector