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BGP: Align printing for error 7 with RFC 7313 / IANA Error codes registry
[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@gredler.at) for more
30 * complete BGP support.
31 */
32
33 /* \summary: Border Gateway Protocol (BGP) printer */
34
35 /* specification: RFC 4271 */
36
37 #ifdef HAVE_CONFIG_H
38 #include <config.h>
39 #endif
40
41 #include "netdissect-stdinc.h"
42
43 #include <stdio.h>
44 #include <string.h>
45
46 #include "netdissect.h"
47 #include "addrtoname.h"
48 #include "extract.h"
49 #include "af.h"
50 #include "l2vpn.h"
51
52 struct bgp {
53 nd_byte bgp_marker[16];
54 nd_uint16_t bgp_len;
55 nd_uint8_t bgp_type;
56 };
57 #define BGP_SIZE 19 /* unaligned */
58
59 #define BGP_OPEN 1
60 #define BGP_UPDATE 2
61 #define BGP_NOTIFICATION 3
62 #define BGP_KEEPALIVE 4
63 #define BGP_ROUTE_REFRESH 5
64
65 static const struct tok bgp_msg_values[] = {
66 { BGP_OPEN, "Open"},
67 { BGP_UPDATE, "Update"},
68 { BGP_NOTIFICATION, "Notification"},
69 { BGP_KEEPALIVE, "Keepalive"},
70 { BGP_ROUTE_REFRESH, "Route Refresh"},
71 { 0, NULL}
72 };
73
74 struct bgp_open {
75 nd_byte bgpo_marker[16];
76 nd_uint16_t bgpo_len;
77 nd_uint8_t bgpo_type;
78 nd_uint8_t bgpo_version;
79 nd_uint16_t bgpo_myas;
80 nd_uint16_t bgpo_holdtime;
81 nd_uint32_t bgpo_id;
82 nd_uint8_t bgpo_optlen;
83 nd_uint8_t bgpo_opttype; /* RFC9072 */
84 nd_uint16_t bgpo_optlen_extended; /* RFC9072 */
85 /* options should follow */
86 };
87 #define BGP_OPEN_SIZE 29 /* unaligned */
88
89 struct bgp_opt {
90 nd_uint8_t bgpopt_type;
91 nd_uint16_t bgpopt_len; /* Can be one or two bytes, depending on RFC9072 */
92 /* variable length */
93 };
94 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
95 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
96
97 struct bgp_notification {
98 nd_byte bgpn_marker[16];
99 nd_uint16_t bgpn_len;
100 nd_uint8_t bgpn_type;
101 nd_uint8_t bgpn_major;
102 nd_uint8_t bgpn_minor;
103 };
104 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
105
106 struct bgp_route_refresh_orf {
107 nd_uint8_t refresh;
108 nd_uint8_t type;
109 nd_uint16_t len;
110 };
111
112 struct bgp_route_refresh {
113 nd_byte bgp_marker[16];
114 nd_uint16_t len;
115 nd_uint8_t type; /* No padding after this; afi is, in fact, not aligned */
116 nd_uint16_t afi;
117 nd_uint8_t subtype;
118 nd_uint8_t safi;
119 };
120
121 static const struct tok bgp_orf_refresh_type[] = {
122 { 1, "Immediate"},
123 { 2, "Defer"},
124 { 0, NULL }
125 };
126
127 static const struct tok bgp_orf_type[] = {
128 { 64, "Address Prefix ORF"},
129 { 65, "CP-ORF"},
130 { 0, NULL }
131 };
132
133 #define BGP_ROUTE_REFRESH_SIZE 23
134 #define BGP_ROUTE_REFRESH_SIZE_ORF BGP_ROUTE_REFRESH_SIZE + 5
135 #define BGP_ROUTE_REFRESH_SUBTYPE_NORMAL 0
136 #define BGP_ROUTE_REFRESH_SUBTYPE_BORR 1
137 #define BGP_ROUTE_REFRESH_SUBTYPE_EORR 2
138 #define BGP_ROUTE_REFRESH_SUBTYPE_RESERVED 255
139
140 static const struct tok bgp_route_refresh_subtype_values[] = {
141 {BGP_ROUTE_REFRESH_SUBTYPE_NORMAL, "Normal route refresh request"},
142 {BGP_ROUTE_REFRESH_SUBTYPE_BORR,
143 "Demarcation of the beginning of a route refresh"},
144 {BGP_ROUTE_REFRESH_SUBTYPE_EORR,
145 "Demarcation of the ending of a route refresh"},
146 {0, NULL}};
147
148 #define bgp_attr_lenlen(flags, p) \
149 (((flags) & 0x10) ? 2U : 1U)
150 #define bgp_attr_len(flags, p) \
151 (((flags) & 0x10) ? GET_BE_U_2(p) : GET_U_1(p))
152
153 #define BGPTYPE_ORIGIN 1
154 #define BGPTYPE_AS_PATH 2
155 #define BGPTYPE_NEXT_HOP 3
156 #define BGPTYPE_MULTI_EXIT_DISC 4
157 #define BGPTYPE_LOCAL_PREF 5
158 #define BGPTYPE_ATOMIC_AGGREGATE 6
159 #define BGPTYPE_AGGREGATOR 7
160 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
161 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */
162 #define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */
163 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */
164 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */
165 #define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */
166 #define BGPTYPE_AS4_PATH 17 /* RFC6793 */
167 #define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */
168 #define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */
169 #define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */
170 #define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */
171 #define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */
172 #define BGPTYPE_AIGP 26 /* RFC7311 */
173 #define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */
174 #define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */
175 #define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */
176 #define BGPTYPE_BGPSEC_PATH 33 /* RFC8205 */
177 #define BGPTYPE_OTC 35 /* RFC9234 */
178 #define BGPTYPE_ATTR_SET 128 /* RFC6368 */
179
180 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
181
182 static const struct tok bgp_attr_values[] = {
183 { BGPTYPE_ORIGIN, "Origin"},
184 { BGPTYPE_AS_PATH, "AS Path"},
185 { BGPTYPE_AS4_PATH, "AS4 Path"},
186 { BGPTYPE_NEXT_HOP, "Next Hop"},
187 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
188 { BGPTYPE_LOCAL_PREF, "Local Preference"},
189 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
190 { BGPTYPE_AGGREGATOR, "Aggregator"},
191 { BGPTYPE_AGGREGATOR4, "Aggregator4"},
192 { BGPTYPE_COMMUNITIES, "Community"},
193 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
194 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
195 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
196 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
197 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
198 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
199 { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"},
200 { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"},
201 { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
202 { BGPTYPE_AIGP, "Accumulated IGP Metric"},
203 { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
204 { BGPTYPE_ENTROPY_LABEL, "Entropy Label"},
205 { BGPTYPE_LARGE_COMMUNITY, "Large Community"},
206 { BGPTYPE_BGPSEC_PATH, "BGPsec Path"},
207 { BGPTYPE_OTC, "Only to Customer (OTC)"},
208 { BGPTYPE_ATTR_SET, "Attribute Set"},
209 { 255, "Reserved for development"},
210 { 0, NULL}
211 };
212
213 #define BGP_AS_SET 1
214 #define BGP_AS_SEQUENCE 2
215 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
216 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
217
218 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
219 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
220
221 static const struct tok bgp_as_path_segment_open_values[] = {
222 { BGP_AS_SEQUENCE, ""},
223 { BGP_AS_SET, "{ "},
224 { BGP_CONFED_AS_SEQUENCE, "( "},
225 { BGP_CONFED_AS_SET, "({ "},
226 { 0, NULL}
227 };
228
229 static const struct tok bgp_as_path_segment_close_values[] = {
230 { BGP_AS_SEQUENCE, ""},
231 { BGP_AS_SET, "}"},
232 { BGP_CONFED_AS_SEQUENCE, ")"},
233 { BGP_CONFED_AS_SET, "})"},
234 { 0, NULL}
235 };
236
237 #define BGP_OPT_AUTH 1
238 #define BGP_OPT_CAP 2
239
240 static const struct tok bgp_opt_values[] = {
241 { BGP_OPT_AUTH, "Authentication Information"},
242 { BGP_OPT_CAP, "Capabilities Advertisement"},
243 { 0, NULL}
244 };
245
246 #define BGP_CAPCODE_MP 1 /* RFC2858 */
247 #define BGP_CAPCODE_RR 2 /* RFC2918 */
248 #define BGP_CAPCODE_ORF 3 /* RFC5291 */
249 #define BGP_CAPCODE_MR 4 /* RFC3107 */
250 #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */
251 #define BGP_CAPCODE_EXT_MSG 6 /* RFC8654 */
252 #define BGP_CAPCODE_BGPSEC 7 /* RFC8205 */
253 #define BGP_CAPCODE_ML 8 /* RFC8277 */
254 #define BGP_CAPCODE_ROLE 9 /* RFC9234 */
255 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */
256 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
257 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
258 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
259 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
260 #define BGP_CAPCODE_ENH_RR 70 /* RFC7313 */
261 #define BGP_CAPCODE_LLGR 71 /* draft-uttaro-idr-bgp-persistence-05 */
262 #define BGP_CAPCODE_RR_CISCO 128
263
264 static const struct tok bgp_capcode_values[] = {
265 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
266 { BGP_CAPCODE_RR, "Route Refresh"},
267 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
268 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
269 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
270 { BGP_CAPCODE_EXT_MSG, "BGP Extended Message"},
271 { BGP_CAPCODE_BGPSEC, "BGPsec"},
272 { BGP_CAPCODE_ML, "Multiple Labels"},
273 { BGP_CAPCODE_RESTART, "Graceful Restart"},
274 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
275 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
276 { BGP_CAPCODE_MULTISESS, "Multisession BGP"},
277 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
278 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
279 { BGP_CAPCODE_LLGR, "Long-lived Graceful Restart"},
280 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
281 { BGP_CAPCODE_ROLE, "Role Capability"},
282 { 0, NULL}
283 };
284
285 #define BGP_NOTIFY_MAJOR_MSG 1
286 #define BGP_NOTIFY_MAJOR_OPEN 2
287 #define BGP_NOTIFY_MAJOR_UPDATE 3
288 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
289 #define BGP_NOTIFY_MAJOR_FSM 5
290 #define BGP_NOTIFY_MAJOR_CEASE 6
291 #define BGP_NOTIFY_MAJOR_ROUTEREFRESH 7
292
293 static const struct tok bgp_notify_major_values[] = {
294 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
295 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
296 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
297 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
298 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
299 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
300 { BGP_NOTIFY_MAJOR_ROUTEREFRESH, "ROUTE-REFRESH Message Error"},
301 { 0, NULL}
302 };
303
304 /* RFC 4486 */
305 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
306 /* RFC 9003 */
307 #define BGP_NOTIFY_MINOR_CEASE_SHUT 2
308 #define BGP_NOTIFY_MINOR_CEASE_RESET 4
309 /* RFC 8538 */
310 #define BGP_NOTIFY_MINOR_CEASE_HARDRESET 9
311 static const struct tok bgp_notify_minor_cease_values[] = {
312 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
313 { BGP_NOTIFY_MINOR_CEASE_SHUT, "Administrative Shutdown"},
314 { 3, "Peer Unconfigured"},
315 { BGP_NOTIFY_MINOR_CEASE_RESET, "Administrative Reset"},
316 { 5, "Connection Rejected"},
317 { 6, "Other Configuration Change"},
318 { 7, "Connection Collision Resolution"},
319 { 8, "Out of Resources"},
320 { BGP_NOTIFY_MINOR_CEASE_HARDRESET, "Hard Reset"},
321 { 10, "BFD Down"},
322 { 0, NULL}
323 };
324
325 static const struct tok bgp_notify_minor_msg_values[] = {
326 { 1, "Connection Not Synchronized"},
327 { 2, "Bad Message Length"},
328 { 3, "Bad Message Type"},
329 { 0, NULL}
330 };
331
332 static const struct tok bgp_notify_minor_open_values[] = {
333 { 1, "Unsupported Version Number"},
334 { 2, "Bad Peer AS"},
335 { 3, "Bad BGP Identifier"},
336 { 4, "Unsupported Optional Parameter"},
337 { 5, "Authentication Failure"},
338 { 6, "Unacceptable Hold Time"},
339 { 7, "Capability Message Error"},
340 { 0, NULL}
341 };
342
343 static const struct tok bgp_notify_minor_update_values[] = {
344 { 1, "Malformed Attribute List"},
345 { 2, "Unrecognized Well-known Attribute"},
346 { 3, "Missing Well-known Attribute"},
347 { 4, "Attribute Flags Error"},
348 { 5, "Attribute Length Error"},
349 { 6, "Invalid ORIGIN Attribute"},
350 { 7, "AS Routing Loop"},
351 { 8, "Invalid NEXT_HOP Attribute"},
352 { 9, "Optional Attribute Error"},
353 { 10, "Invalid Network Field"},
354 { 11, "Malformed AS_PATH"},
355 { 0, NULL}
356 };
357
358 static const struct tok bgp_notify_minor_fsm_values[] = {
359 { 0, "Unspecified Error"},
360 { 1, "In OpenSent State"},
361 { 2, "In OpenConfirm State"},
362 { 3, "In Established State"},
363 { 0, NULL }
364 };
365
366 static const struct tok bgp_notify_minor_routerefresh_values[] = {
367 { 1, "Invalid Message Length" },
368 { 0, NULL }
369 };
370
371 static const struct tok bgp_origin_values[] = {
372 { 0, "IGP"},
373 { 1, "EGP"},
374 { 2, "Incomplete"},
375 { 0, NULL}
376 };
377
378 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1
379 #define BGP_PMSI_TUNNEL_LDP_P2MP 2
380 #define BGP_PMSI_TUNNEL_PIM_SSM 3
381 #define BGP_PMSI_TUNNEL_PIM_SM 4
382 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5
383 #define BGP_PMSI_TUNNEL_INGRESS 6
384 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7
385
386 static const struct tok bgp_pmsi_tunnel_values[] = {
387 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
388 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
389 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
390 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
391 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
392 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
393 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
394 { 0, NULL}
395 };
396
397 static const struct tok bgp_pmsi_flag_values[] = {
398 { 0x01, "Leaf Information required"},
399 { 0, NULL}
400 };
401
402 #define BGP_AIGP_TLV 1
403
404 static const struct tok bgp_aigp_values[] = {
405 { BGP_AIGP_TLV, "AIGP"},
406 { 0, NULL}
407 };
408
409 #define BGP_ROLE_PROVIDER 0
410 #define BGP_ROLE_RS 1
411 #define BGP_ROLE_RS_CLIENT 2
412 #define BGP_ROLE_CUSTOMER 3
413 #define BGP_ROLE_PEER 4
414
415 static const struct tok bgp_role_values[] = {
416 { BGP_ROLE_PROVIDER, "Provider"},
417 { BGP_ROLE_RS, "RS"},
418 { BGP_ROLE_RS_CLIENT, "RS-Client"},
419 { BGP_ROLE_CUSTOMER, "Customer"},
420 { BGP_ROLE_PEER, "Peer"},
421 { 0, NULL}
422 };
423
424 /* Subsequent address family identifier, RFC2283 section 7 */
425 #define SAFNUM_RES 0
426 #define SAFNUM_UNICAST 1
427 #define SAFNUM_MULTICAST 2
428 #define SAFNUM_UNIMULTICAST 3 /* deprecated now */
429 /* labeled BGP RFC3107 */
430 #define SAFNUM_LABUNICAST 4
431 /* RFC6514 */
432 #define SAFNUM_MULTICAST_VPN 5
433 /* draft-nalawade-kapoor-tunnel-safi */
434 #define SAFNUM_TUNNEL 64
435 /* RFC4761 */
436 #define SAFNUM_VPLS 65
437 /* RFC6037 */
438 #define SAFNUM_MDT 66
439 /* RFC7432 */
440 #define SAFNUM_EVPN 70
441 /* RFC4364 */
442 #define SAFNUM_VPNUNICAST 128
443 /* RFC6513 */
444 #define SAFNUM_VPNMULTICAST 129
445 #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */
446 /* RFC4684 */
447 #define SAFNUM_RT_ROUTING_INFO 132
448
449 #define BGP_VPN_RD_LEN 8
450
451 static const struct tok bgp_safi_values[] = {
452 { SAFNUM_RES, "Reserved"},
453 { SAFNUM_UNICAST, "Unicast"},
454 { SAFNUM_MULTICAST, "Multicast"},
455 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
456 { SAFNUM_LABUNICAST, "labeled Unicast"},
457 { SAFNUM_TUNNEL, "Tunnel"},
458 { SAFNUM_VPLS, "VPLS"},
459 { SAFNUM_MDT, "MDT"},
460 { SAFNUM_EVPN, "EVPN"},
461 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
462 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
463 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
464 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
465 { SAFNUM_MULTICAST_VPN, "Multicast VPN"},
466 { 0, NULL }
467 };
468
469 static const struct tok bgp_graceful_restart_comm_flag_values[] = {
470 { 0x8, "R" },
471 { 0x4, "N" },
472 { 0, NULL }
473 };
474
475 /* well-known community */
476 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
477 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
478 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
479
480 /* Extended community type - RFC 4360 */
481 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
482 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
483 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
484 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
485 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
486 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
487 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
488 #define BGP_EXT_COM_OVS 0x4300 /* BGP Prefix Origin Validation State Extended Community */
489 /* rfc2547 bgp-mpls-vpns */
490 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
491 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatibility */
492 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatibility */
493 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatibility */
494
495 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
496 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatibility */
497 #define BGP_EXT_COM_ENCAP 0x030c /* rfc5512 */
498
499 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
500 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatibility */
501
502 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
503
504 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
505 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
506 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
507 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */
508
509 /* https://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */
510 #define BGP_EXT_COM_EIGRP_GEN 0x8800
511 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801
512 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
513 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803
514 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804
515 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
516
517 /* Optional Parameters */
518 #define BGP_OPEN_NON_EXT_OPT_TYPE_EXTENDED_LENGTH 255 /* Non-Ext OP Type */
519
520 static const struct tok bgp_extd_comm_flag_values[] = {
521 { 0x8000, "vendor-specific"},
522 { 0x4000, "non-transitive"},
523 { 0, NULL},
524 };
525
526 /* rfc8097 */
527 static const struct tok bgp_prefix_origin_validation_state[] = {
528 { 0, "valid" },
529 { 1, "not found" },
530 { 2, "invalid" },
531 { 0, NULL },
532 };
533
534 static const struct tok bgp_extd_comm_subtype_values[] = {
535 { BGP_EXT_COM_RT_0, "target"},
536 { BGP_EXT_COM_RT_1, "target"},
537 { BGP_EXT_COM_RT_2, "target"},
538 { BGP_EXT_COM_RO_0, "origin"},
539 { BGP_EXT_COM_RO_1, "origin"},
540 { BGP_EXT_COM_RO_2, "origin"},
541 { BGP_EXT_COM_LINKBAND, "link-BW"},
542 { BGP_EXT_COM_OVS, "origin-validation-state"},
543 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
544 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
545 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
546 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
547 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
548 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
549 { BGP_EXT_COM_ENCAP, "encapsulation"},
550 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
551 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
552 { BGP_EXT_COM_L2INFO, "layer2-info"},
553 { BGP_EXT_COM_EIGRP_GEN, "eigrp-general-route (flag, tag)" },
554 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY, "eigrp-route-metric (AS, delay)" },
555 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW, "eigrp-route-metric (reliability, nexthop, bandwidth)" },
556 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU, "eigrp-route-metric (load, MTU)" },
557 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID, "eigrp-external-route (remote-AS, remote-ID)" },
558 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC, "eigrp-external-route (remote-proto, remote-metric)" },
559 { BGP_EXT_COM_SOURCE_AS, "source-AS" },
560 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
561 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
562 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
563 { 0, NULL},
564 };
565
566 /* RFC RFC5512 BGP Tunnel Encapsulation Attribute Tunnel Types */
567 #define BGP_ENCAP_TUNNEL_L2TPV3_IP 1
568 #define BGP_ENCAP_TUNNEL_GRE 2
569 #define BGP_ENCAP_TUNNEL_TRANSMIT 3
570 #define BGP_ENCAP_TUNNEL_IPSEC 4
571 #define BGP_ENCAP_TUNNEL_IP_IPSEC 5
572 #define BGP_ENCAP_TUNNEL_MPLS_IP 6
573 #define BGP_ENCAP_TUNNEL_IP_IP 7
574 #define BGP_ENCAP_TUNNEL_VXLAN 8
575 #define BGP_ENCAP_TUNNEL_NVGRE 9
576 #define BGP_ENCAP_TUNNEL_MPLS 10
577 #define BGP_ENCAP_TUNNEL_MPLS_GRE 11
578 #define BGP_ENCAP_TUNNEL_VXLAN_GPE 12
579 #define BGP_ENCAP_TUNNEL_MPLS_UDP 13
580 #define BGP_ENCAP_TUNNEL_IPV6 14
581 #define BGP_ENCAP_TUNNEL_SR_TE 15
582 #define BGP_ENCAP_TUNNEL_BARE 16
583 #define BGP_ENCAP_TUNNEL_SR 17
584
585 static const struct tok bgp_extd_comm_encap_tunnel_values[] = {
586 { BGP_ENCAP_TUNNEL_L2TPV3_IP, "L2TPv3 over IP"},
587 { BGP_ENCAP_TUNNEL_GRE, "GRE"},
588 { BGP_ENCAP_TUNNEL_TRANSMIT, "Transmit Tunnel"},
589 { BGP_ENCAP_TUNNEL_IPSEC, "IPsec"},
590 { BGP_ENCAP_TUNNEL_IP_IPSEC, "IP in IP with IPsec"},
591 { BGP_ENCAP_TUNNEL_MPLS_IP, "MPLS in IP with IPsec"},
592 { BGP_ENCAP_TUNNEL_IP_IP, "IP in IP"},
593 { BGP_ENCAP_TUNNEL_VXLAN, "VXLAN"},
594 { BGP_ENCAP_TUNNEL_NVGRE, "NVGRE"},
595 { BGP_ENCAP_TUNNEL_MPLS, "MPLS"},
596 { BGP_ENCAP_TUNNEL_MPLS_GRE, "MPLS in GRE"},
597 { BGP_ENCAP_TUNNEL_VXLAN_GPE, "VXLAN GPE"},
598 { BGP_ENCAP_TUNNEL_MPLS_UDP, "MPLS in UDP"},
599 { BGP_ENCAP_TUNNEL_IPV6, "IPv6"},
600 { BGP_ENCAP_TUNNEL_SR_TE, "SR TE"},
601 { BGP_ENCAP_TUNNEL_BARE, "Bare"},
602 { BGP_ENCAP_TUNNEL_SR, "SR"},
603 { 0, NULL},
604 };
605
606 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
607 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
608 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
609 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
610 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
611 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
612 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
613 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
614
615 static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
616 { BGP_OSPF_RTYPE_RTR, "Router" },
617 { BGP_OSPF_RTYPE_NET, "Network" },
618 { BGP_OSPF_RTYPE_SUM, "Summary" },
619 { BGP_OSPF_RTYPE_EXT, "External" },
620 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
621 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
622 { 0, NULL },
623 };
624
625 /* ADD-PATH Send/Receive field values */
626 static const struct tok bgp_add_path_recvsend[] = {
627 { 1, "Receive" },
628 { 2, "Send" },
629 { 3, "Both" },
630 { 0, NULL },
631 };
632
633 static const struct tok bgp_bgpsec_bitmap_str[] = {
634 { 1U << 0, "MBZ-0" },
635 { 1U << 1, "MBZ-1" },
636 { 1U << 2, "MBZ-2" },
637 { 1U << 3, "MBZ-3" },
638 { 1U << 4, "MBZ-4" },
639 { 1U << 5, "MBZ-5" },
640 { 1U << 6, "MBZ-6" },
641 { 1U << 7, "C" },
642 { 0, NULL}
643 };
644
645 #define AS_STR_SIZE sizeof("xxxxx.xxxxx")
646
647 /*
648 * as_printf
649 *
650 * Convert an AS number into a string and return string pointer.
651 *
652 * Depending on bflag is set or not, AS number is converted into ASDOT notation
653 * or plain number notation.
654 *
655 */
656 static char *
657 as_printf(netdissect_options *ndo,
658 char *str, size_t size, u_int asnum)
659 {
660 if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
661 snprintf(str, size, "%u", asnum);
662 } else {
663 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
664 }
665 return str;
666 }
667
668 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
669
670 int
671 decode_prefix4(netdissect_options *ndo,
672 const u_char *pptr, u_int itemlen, char *buf, size_t buflen)
673 {
674 nd_ipv4 addr;
675 u_int plen, plenbytes;
676
677 ITEMCHECK(1);
678 plen = GET_U_1(pptr);
679 if (32 < plen)
680 return -1;
681 itemlen -= 1;
682
683 memset(&addr, 0, sizeof(addr));
684 plenbytes = (plen + 7) / 8;
685 ITEMCHECK(plenbytes);
686 GET_CPY_BYTES(&addr, pptr + 1, plenbytes);
687 if (plen % 8) {
688 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
689 }
690 snprintf(buf, buflen, "%s/%u", ipaddr_string(ndo, (const u_char *)&addr), plen);
691 return 1 + plenbytes;
692
693 badtlv:
694 return -2;
695 }
696
697 static int
698 decode_labeled_prefix4(netdissect_options *ndo,
699 const u_char *pptr, u_int itemlen, char *buf,
700 size_t buflen)
701 {
702 nd_ipv4 addr;
703 u_int plen, plenbytes;
704
705 /* prefix length and label = 4 bytes */
706 ND_TCHECK_4(pptr);
707 ITEMCHECK(4);
708 plen = GET_U_1(pptr); /* get prefix length */
709
710 /* this is one of the weirdnesses of rfc3107
711 the label length (actually the label + COS bits)
712 is added to the prefix length;
713 we also do only read out just one label -
714 there is no real application for advertisement of
715 stacked labels in a single BGP message
716 */
717
718 if (24 > plen)
719 return -1;
720
721 plen-=24; /* adjust prefixlen - labellength */
722
723 if (32 < plen)
724 return -1;
725 itemlen -= 4;
726
727 memset(&addr, 0, sizeof(addr));
728 plenbytes = (plen + 7) / 8;
729 ITEMCHECK(plenbytes);
730 GET_CPY_BYTES(&addr, pptr + 4, plenbytes);
731 if (plen % 8) {
732 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
733 }
734 /* the label may get offsetted by 4 bits so lets shift it right */
735 snprintf(buf, buflen, "%s/%u, label:%u %s",
736 ipaddr_string(ndo, (const u_char *)&addr),
737 plen,
738 GET_BE_U_3(pptr + 1)>>4,
739 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
740
741 return 4 + plenbytes;
742
743 trunc:
744 return -2;
745
746 badtlv:
747 return -3;
748 }
749
750 /*
751 * bgp_vpn_ip_print
752 *
753 * print an ipv4 or ipv6 address into a buffer dependent on address length.
754 */
755 static char *
756 bgp_vpn_ip_print(netdissect_options *ndo,
757 const u_char *pptr, u_int addr_length)
758 {
759
760 /* worst case string is s fully formatted v6 address */
761 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
762 char *pos = addr;
763
764 switch(addr_length) {
765 case (sizeof(nd_ipv4) << 3): /* 32 */
766 snprintf(pos, sizeof(addr), "%s", GET_IPADDR_STRING(pptr));
767 break;
768 case (sizeof(nd_ipv6) << 3): /* 128 */
769 snprintf(pos, sizeof(addr), "%s", GET_IP6ADDR_STRING(pptr));
770 break;
771 default:
772 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
773 break;
774 }
775 pos += strlen(pos);
776
777 *(pos) = '\0';
778 return (addr);
779 }
780
781 /*
782 * bgp_vpn_sg_print
783 *
784 * print an multicast s,g entry into a buffer.
785 * the s,g entry is encoded like this.
786 *
787 * +-----------------------------------+
788 * | Multicast Source Length (1 octet) |
789 * +-----------------------------------+
790 * | Multicast Source (Variable) |
791 * +-----------------------------------+
792 * | Multicast Group Length (1 octet) |
793 * +-----------------------------------+
794 * | Multicast Group (Variable) |
795 * +-----------------------------------+
796 *
797 * return the number of bytes read from the wire.
798 */
799 static u_int
800 bgp_vpn_sg_print(netdissect_options *ndo,
801 const u_char *pptr, char *buf, size_t buflen)
802 {
803 uint8_t addr_length;
804 u_int total_length, offset;
805
806 total_length = 0;
807
808 /* Source address length, encoded in bits */
809 addr_length = GET_U_1(pptr);
810 pptr++;
811
812 /* Source address */
813 ND_TCHECK_LEN(pptr, (addr_length >> 3));
814 total_length += (addr_length >> 3) + 1;
815 offset = (u_int)strlen(buf);
816 if (addr_length) {
817 snprintf(buf + offset, buflen - offset, ", Source %s",
818 bgp_vpn_ip_print(ndo, pptr, addr_length));
819 pptr += (addr_length >> 3);
820 }
821
822 /* Group address length, encoded in bits */
823 addr_length = GET_U_1(pptr);
824 pptr++;
825
826 /* Group address */
827 ND_TCHECK_LEN(pptr, (addr_length >> 3));
828 total_length += (addr_length >> 3) + 1;
829 offset = (u_int)strlen(buf);
830 if (addr_length) {
831 snprintf(buf + offset, buflen - offset, ", Group %s",
832 bgp_vpn_ip_print(ndo, pptr, addr_length));
833 pptr += (addr_length >> 3);
834 }
835
836 trunc:
837 return (total_length);
838 }
839
840 /* Print an RFC 4364 Route Distinguisher */
841 const char *
842 bgp_vpn_rd_print(netdissect_options *ndo,
843 const u_char *pptr)
844 {
845 /* allocate space for the largest possible string */
846 static char rd[sizeof("xxxxx.xxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
847 char *pos = rd;
848 /* allocate space for the largest possible string */
849 char astostr[AS_STR_SIZE];
850
851 /* ok lets load the RD format */
852 switch (GET_BE_U_2(pptr)) {
853
854 case 0:
855 /* 2-byte-AS:number fmt */
856 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
857 GET_BE_U_2(pptr + 2),
858 GET_BE_U_4(pptr + 4),
859 GET_U_1(pptr + 4), GET_U_1(pptr + 5),
860 GET_U_1(pptr + 6), GET_U_1(pptr + 7));
861 break;
862
863 case 1:
864 /* IP-address:AS fmt */
865 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
866 GET_U_1(pptr + 2), GET_U_1(pptr + 3),
867 GET_U_1(pptr + 4), GET_U_1(pptr + 5),
868 GET_BE_U_2(pptr + 6));
869 break;
870
871 case 2:
872 /* 4-byte-AS:number fmt */
873 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
874 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 2)),
875 GET_BE_U_2(pptr + 6), GET_U_1(pptr + 2),
876 GET_U_1(pptr + 3), GET_U_1(pptr + 4),
877 GET_U_1(pptr + 5), GET_BE_U_2(pptr + 6));
878 break;
879 default:
880 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
881 break;
882 }
883 pos += strlen(pos);
884 *(pos) = '\0';
885 return (rd);
886 }
887
888 /*
889 * Print an RFC 4360 Extended Community.
890 */
891 static void
892 bgp_extended_community_print(netdissect_options *ndo,
893 const u_char *pptr)
894 {
895 union { /* copy buffer for bandwidth values */
896 float f;
897 uint32_t i;
898 } bw;
899 /* allocate space for the largest possible string */
900 char astostr[AS_STR_SIZE];
901
902 switch (GET_BE_U_2(pptr)) {
903
904 case BGP_EXT_COM_RT_0:
905 case BGP_EXT_COM_RO_0:
906 case BGP_EXT_COM_L2VPN_RT_0:
907 ND_PRINT("%u:%u (= %s)",
908 GET_BE_U_2(pptr + 2),
909 GET_BE_U_4(pptr + 4),
910 GET_IPADDR_STRING(pptr+4));
911 break;
912
913 case BGP_EXT_COM_RT_1:
914 case BGP_EXT_COM_RO_1:
915 case BGP_EXT_COM_L2VPN_RT_1:
916 case BGP_EXT_COM_VRF_RT_IMP:
917 ND_PRINT("%s:%u",
918 GET_IPADDR_STRING(pptr+2),
919 GET_BE_U_2(pptr + 6));
920 break;
921
922 case BGP_EXT_COM_RT_2:
923 case BGP_EXT_COM_RO_2:
924 ND_PRINT("%s:%u",
925 as_printf(ndo, astostr, sizeof(astostr),
926 GET_BE_U_4(pptr + 2)), GET_BE_U_2(pptr + 6));
927 break;
928
929 case BGP_EXT_COM_LINKBAND:
930 bw.i = GET_BE_U_4(pptr + 4);
931 ND_PRINT("bandwidth: %.3f Mbps",
932 bw.f*8/1000000);
933 break;
934
935 case BGP_EXT_COM_OVS:
936 /* The Reserved field MUST be set to 0 and ignored upon the
937 * receipt of this community.
938 */
939 {
940 uint64_t reserved = GET_BE_U_5(pptr + 2);
941
942 if (reserved)
943 ND_PRINT("[the reserved field 0x%" PRIx64 " MUST be 0] ",
944 reserved);
945 ND_PRINT("ovs: %s",
946 tok2str(bgp_prefix_origin_validation_state,
947 "unknown origin validation state",
948 GET_U_1(pptr + 7)));
949 }
950 break;
951
952 case BGP_EXT_COM_VPN_ORIGIN:
953 case BGP_EXT_COM_VPN_ORIGIN2:
954 case BGP_EXT_COM_VPN_ORIGIN3:
955 case BGP_EXT_COM_VPN_ORIGIN4:
956 case BGP_EXT_COM_OSPF_RID:
957 case BGP_EXT_COM_OSPF_RID2:
958 ND_PRINT("%s", GET_IPADDR_STRING(pptr+2));
959 break;
960
961 case BGP_EXT_COM_OSPF_RTYPE:
962 case BGP_EXT_COM_OSPF_RTYPE2:
963 ND_PRINT("area:%s, router-type:%s, metric-type:%s%s",
964 GET_IPADDR_STRING(pptr+2),
965 tok2str(bgp_extd_comm_ospf_rtype_values,
966 "unknown (0x%02x)",
967 GET_U_1((pptr + 6))),
968 (GET_U_1(pptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
969 ((GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_EXT) || (GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "");
970 break;
971
972 case BGP_EXT_COM_L2INFO:
973 ND_PRINT("%s Control Flags [0x%02x]:MTU %u",
974 tok2str(l2vpn_encaps_values,
975 "unknown encaps",
976 GET_U_1((pptr + 2))),
977 GET_U_1((pptr + 3)),
978 GET_BE_U_2(pptr + 4));
979 break;
980
981 case BGP_EXT_COM_SOURCE_AS:
982 ND_PRINT("AS %u", GET_BE_U_2(pptr + 2));
983 break;
984
985 case BGP_EXT_COM_ENCAP:
986 ND_PRINT("Tunnel type: %s", tok2str(bgp_extd_comm_encap_tunnel_values,
987 "unknown encaps",
988 GET_BE_U_2(pptr + 6)));
989 break;
990
991 default:
992 ND_PRINT("%02x%02x%02x%02x%02x%02x",
993 GET_U_1(pptr + 2),
994 GET_U_1(pptr + 3),
995 GET_U_1(pptr + 4),
996 GET_U_1(pptr + 5),
997 GET_U_1(pptr + 6),
998 GET_U_1(pptr + 7));
999 break;
1000 }
1001 }
1002
1003 /*
1004 * RFC4684 (Section 4)/RFC2858 (Section 4).
1005 * RTC membership prefix is structured as follows
1006 * [prefix-len] [origin-as] [route-target]
1007 * The route-target is encoded as RT ext-comms.
1008 * Prefix-len may be 0, 32..96
1009 *
1010 * Note that pptr is not packet data - it is
1011 * a buffer owned by our caller - therefore GET_*
1012 * macros can not be used.
1013 */
1014 static char *
1015 bgp_rt_prefix_print(netdissect_options *ndo,
1016 const u_char *pptr,
1017 u_int plen)
1018 {
1019 /* allocate space for the largest possible string */
1020 char rtc_prefix_in_hex[sizeof("0000 0000 0000 0000")] = "";
1021 u_int rtc_prefix_in_hex_len = 0;
1022 static char output[61]; /* max response string */
1023 /* allocate space for the largest possible string */
1024 char astostr[AS_STR_SIZE];
1025 uint16_t ec_type = 0;
1026 u_int octet_count;
1027 u_int i;
1028
1029 if (plen == 0) {
1030 snprintf(output, sizeof(output), "route-target: 0:0/0");
1031 return (output);
1032 }
1033
1034 /* hex representation of the prefix */
1035 octet_count = (plen+7)/8;
1036 for (i=0; i<octet_count; i++) {
1037 rtc_prefix_in_hex_len += snprintf(rtc_prefix_in_hex+rtc_prefix_in_hex_len,
1038 sizeof(rtc_prefix_in_hex)-rtc_prefix_in_hex_len,
1039 "%02x%s", *(pptr+i),
1040 ((i%2 == 1) && (i<octet_count-1)) ? " " : "");
1041 }
1042
1043 if (plen < 16) {
1044 /*
1045 * The prefix is too short to include the full ext-comm type,
1046 * so we have no way to parse it further.
1047 */
1048 snprintf(output, sizeof(output), "route-target: partial-type: (%s/%d)",
1049 rtc_prefix_in_hex, plen);
1050 return (output);
1051 }
1052
1053 /*
1054 * get the ext-comm type
1055 * Note: pptr references a static 8 octet buffer with unused bits set to 0,
1056 * hence EXTRACT_*() macros are safe.
1057 */
1058 ec_type = EXTRACT_BE_U_2(pptr);
1059 switch (ec_type) {
1060 case BGP_EXT_COM_RT_0:
1061 /* 2-byte-AS:number fmt */
1062 snprintf(output, sizeof(output), "route-target: %u:%u/%d (%s)",
1063 EXTRACT_BE_U_2(pptr+2),
1064 EXTRACT_BE_U_4(pptr+4),
1065 plen, rtc_prefix_in_hex);
1066 break;
1067
1068 case BGP_EXT_COM_RT_1:
1069 /* IP-address:AS fmt */
1070 snprintf(output, sizeof(output), "route-target: %u.%u.%u.%u:%u/%d (%s)",
1071 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5),
1072 EXTRACT_BE_U_2(pptr+6), plen, rtc_prefix_in_hex);
1073 break;
1074
1075 case BGP_EXT_COM_RT_2:
1076 /* 4-byte-AS:number fmt */
1077 snprintf(output, sizeof(output), "route-target: %s:%u/%d (%s)",
1078 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(pptr+2)),
1079 EXTRACT_BE_U_2(pptr+6), plen, rtc_prefix_in_hex);
1080 break;
1081
1082 default:
1083 snprintf(output, sizeof(output), "route target: unknown-type(%04x) (%s/%d)",
1084 ec_type,
1085 rtc_prefix_in_hex, plen);
1086 break;
1087 }
1088 return (output);
1089 }
1090
1091 /* RFC 4684 */
1092 static int
1093 decode_rt_routing_info(netdissect_options *ndo,
1094 const u_char *pptr)
1095 {
1096 uint8_t route_target[8];
1097 u_int plen;
1098 /* allocate space for the largest possible string */
1099 char astostr[AS_STR_SIZE];
1100 u_int num_octets;
1101
1102 /* NLRI "prefix length" from RFC 2858 Section 4. */
1103 plen = GET_U_1(pptr); /* get prefix length */
1104
1105 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
1106 * RFC 4684 Section 4 defines the layout of "origin AS" and "route
1107 * target" fields inside the "prefix" depending on its length.
1108 */
1109 if (0 == plen) {
1110 /* Without "origin AS", without "route target". */
1111 ND_PRINT("\n\t default route target");
1112 return 1;
1113 }
1114
1115 if (32 > plen) {
1116 ND_PRINT("\n\t (illegal prefix length)");
1117 return -1;
1118 }
1119
1120 /* With at least "origin AS", possibly with "route target". */
1121 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 1));
1122
1123 plen -= 32; /* adjust prefix length */
1124
1125 if (64 < plen) {
1126 ND_PRINT("\n\t (illegal prefix length)");
1127 return -1;
1128 }
1129
1130 /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 }
1131 * and gives the number of octets in the variable-length "route
1132 * target" field inside this NLRI "prefix". Look for it.
1133 */
1134 memset(&route_target, 0, sizeof(route_target));
1135 num_octets = (plen + 7) / 8;
1136 GET_CPY_BYTES(&route_target, pptr + 5, num_octets);
1137 /* If mask-len is not on octet boundary, ensure all extra bits are 0 */
1138 if (plen % 8) {
1139 ((u_char *)&route_target)[num_octets - 1] &=
1140 ((0xff00 >> (plen % 8)) & 0xff);
1141 }
1142 ND_PRINT("\n\t origin AS: %s, %s",
1143 astostr,
1144 bgp_rt_prefix_print(ndo, (u_char *)&route_target, plen));
1145
1146 return 5 + num_octets;
1147 }
1148
1149 static int
1150 decode_labeled_vpn_prefix4(netdissect_options *ndo,
1151 const u_char *pptr, char *buf, size_t buflen)
1152 {
1153 nd_ipv4 addr;
1154 u_int plen;
1155
1156 plen = GET_U_1(pptr); /* get prefix length */
1157
1158 if ((24+64) > plen)
1159 return -1;
1160
1161 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1162
1163 if (32 < plen)
1164 return -1;
1165
1166 memset(&addr, 0, sizeof(addr));
1167 GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
1168 if (plen % 8) {
1169 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
1170 ((0xff00 >> (plen % 8)) & 0xff);
1171 }
1172 /* the label may get offsetted by 4 bits so lets shift it right */
1173 snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1174 bgp_vpn_rd_print(ndo, pptr+4),
1175 ipaddr_string(ndo, (const u_char *)&addr),
1176 plen,
1177 GET_BE_U_3(pptr + 1)>>4,
1178 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1179
1180 return 12 + (plen + 7) / 8;
1181 }
1182
1183 /*
1184 * +-------------------------------+
1185 * | |
1186 * | RD:IPv4-address (12 octets) |
1187 * | |
1188 * +-------------------------------+
1189 * | MDT Group-address (4 octets) |
1190 * +-------------------------------+
1191 */
1192
1193 #define MDT_VPN_NLRI_LEN 16
1194
1195 static int
1196 decode_mdt_vpn_nlri(netdissect_options *ndo,
1197 const u_char *pptr, char *buf, size_t buflen)
1198 {
1199 const u_char *rd;
1200 const u_char *vpn_ip;
1201
1202 /* if the NLRI is not predefined length, quit.*/
1203 if (GET_U_1(pptr) != MDT_VPN_NLRI_LEN * 8)
1204 return -1;
1205 pptr++;
1206
1207 /* RD */
1208 ND_TCHECK_8(pptr);
1209 rd = pptr;
1210 pptr += 8;
1211
1212 /* IPv4 address */
1213 vpn_ip = pptr;
1214 pptr += sizeof(nd_ipv4);
1215
1216 /* MDT Group Address */
1217 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
1218 bgp_vpn_rd_print(ndo, rd), GET_IPADDR_STRING(vpn_ip), GET_IPADDR_STRING(pptr));
1219
1220 return MDT_VPN_NLRI_LEN + 1;
1221
1222 trunc:
1223 return -2;
1224 }
1225
1226 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
1227 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
1228 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
1229 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
1230 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
1231 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
1232 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
1233
1234 static const struct tok bgp_multicast_vpn_route_type_values[] = {
1235 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
1236 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
1237 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
1238 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
1239 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
1240 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
1241 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
1242 { 0, NULL}
1243 };
1244
1245 static int
1246 decode_multicast_vpn(netdissect_options *ndo,
1247 const u_char *pptr, char *buf, size_t buflen)
1248 {
1249 /* allocate space for the largest possible string */
1250 char astostr[AS_STR_SIZE];
1251 uint8_t route_type, route_length;
1252 u_int addr_length, sg_length;
1253 u_int offset;
1254
1255 route_type = GET_U_1(pptr);
1256 pptr++;
1257 route_length = GET_U_1(pptr);
1258 pptr++;
1259
1260 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
1261 tok2str(bgp_multicast_vpn_route_type_values,
1262 "Unknown", route_type),
1263 route_type, route_length);
1264
1265 switch(route_type) {
1266 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
1267 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1268 if (route_length < BGP_VPN_RD_LEN)
1269 goto trunc;
1270 offset = (u_int)strlen(buf);
1271 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
1272 bgp_vpn_rd_print(ndo, pptr),
1273 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
1274 (route_length - BGP_VPN_RD_LEN) << 3));
1275 break;
1276 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
1277 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1278 offset = (u_int)strlen(buf);
1279 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
1280 bgp_vpn_rd_print(ndo, pptr),
1281 as_printf(ndo, astostr, sizeof(astostr),
1282 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1283 break;
1284
1285 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
1286 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1287 offset = (u_int)strlen(buf);
1288 snprintf(buf + offset, buflen - offset, ", RD: %s",
1289 bgp_vpn_rd_print(ndo, pptr));
1290 pptr += BGP_VPN_RD_LEN;
1291
1292 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1293 addr_length = route_length - sg_length;
1294
1295 ND_TCHECK_LEN(pptr, addr_length);
1296 offset = (u_int)strlen(buf);
1297 snprintf(buf + offset, buflen - offset, ", Originator %s",
1298 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
1299 break;
1300
1301 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
1302 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1303 offset = (u_int)strlen(buf);
1304 snprintf(buf + offset, buflen - offset, ", RD: %s",
1305 bgp_vpn_rd_print(ndo, pptr));
1306 pptr += BGP_VPN_RD_LEN;
1307
1308 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1309 break;
1310
1311 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
1312 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
1313 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1314 offset = (u_int)strlen(buf);
1315 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
1316 bgp_vpn_rd_print(ndo, pptr),
1317 as_printf(ndo, astostr, sizeof(astostr),
1318 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1319 pptr += BGP_VPN_RD_LEN + 4;
1320
1321 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1322 break;
1323
1324 /*
1325 * no per route-type printing yet.
1326 */
1327 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
1328 default:
1329 break;
1330 }
1331
1332 return route_length + 2;
1333
1334 trunc:
1335 return -2;
1336 }
1337
1338 /*
1339 * As I remember, some versions of systems have an snprintf() that
1340 * returns -1 if the buffer would have overflowed. If the return
1341 * value is negative, set buflen to 0, to indicate that we've filled
1342 * the buffer up.
1343 *
1344 * If the return value is greater than buflen, that means that
1345 * the buffer would have overflowed; again, set buflen to 0 in
1346 * that case.
1347 */
1348 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1349 if (stringlen<0) \
1350 buflen=0; \
1351 else if ((u_int)stringlen>buflen) \
1352 buflen=0; \
1353 else { \
1354 buflen-=stringlen; \
1355 buf+=stringlen; \
1356 }
1357
1358 static int
1359 decode_labeled_vpn_l2(netdissect_options *ndo,
1360 const u_char *pptr, char *buf, size_t buflen)
1361 {
1362 u_int plen, tlen, tlv_type, tlv_len, ttlv_len;
1363 int stringlen;
1364
1365 plen = GET_BE_U_2(pptr);
1366 tlen = plen;
1367 pptr += 2;
1368 /* Old and new L2VPN NLRI share AFI/SAFI
1369 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1370 * and > 17 as old format. Complain for the middle case
1371 */
1372 if (plen == 12) {
1373 /* assume AD-only with RD, BGPNH */
1374 ND_TCHECK_LEN(pptr, 12);
1375 buf[0] = '\0';
1376 stringlen = snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1377 bgp_vpn_rd_print(ndo, pptr),
1378 GET_IPADDR_STRING(pptr+8));
1379 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1380 pptr += 12;
1381 tlen -= 12;
1382 return plen + 2;
1383 } else if (plen > 17) {
1384 /* assume old format */
1385 /* RD, ID, LBLKOFF, LBLBASE */
1386
1387 ND_TCHECK_LEN(pptr, 15);
1388 buf[0] = '\0';
1389 stringlen = snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1390 bgp_vpn_rd_print(ndo, pptr),
1391 GET_BE_U_2(pptr + 8),
1392 GET_BE_U_2(pptr + 10),
1393 GET_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1394 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1395 pptr += 15;
1396 tlen -= 15;
1397
1398 /* ok now the variable part - lets read out TLVs*/
1399 while (tlen != 0) {
1400 if (tlen < 3) {
1401 if (buflen != 0) {
1402 stringlen=snprintf(buf,buflen, "\n\t\tran past the end");
1403 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1404 }
1405 return plen + 2;
1406 }
1407 tlv_type = GET_U_1(pptr);
1408 pptr++;
1409 tlv_len = GET_BE_U_2(pptr); /* length, in *bits* */
1410 ttlv_len = (tlv_len + 7)/8; /* length, in *bytes* */
1411 pptr += 2;
1412
1413 switch(tlv_type) {
1414 case 1:
1415 if (buflen != 0) {
1416 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1417 tlv_type,
1418 tlv_len);
1419 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1420 }
1421 while (ttlv_len != 0) {
1422 if (tlen < 1) {
1423 if (buflen != 0) {
1424 stringlen=snprintf(buf,buflen, " (ran past the end)");
1425 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1426 }
1427 return plen + 2;
1428 }
1429 ND_TCHECK_1(pptr);
1430 if (buflen != 0) {
1431 stringlen=snprintf(buf,buflen, "%02x",
1432 GET_U_1(pptr));
1433 pptr++;
1434 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1435 }
1436 ttlv_len--;
1437 tlen--;
1438 }
1439 break;
1440 default:
1441 if (buflen != 0) {
1442 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1443 tlv_type,
1444 tlv_len);
1445 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1446 }
1447 if (tlen < ttlv_len) {
1448 if (buflen != 0) {
1449 stringlen=snprintf(buf,buflen, " (ran past the end)");
1450 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1451 }
1452 return plen + 2;
1453 }
1454 tlen -= ttlv_len;
1455 break;
1456 }
1457 }
1458 return plen + 2;
1459 } else {
1460 /* complain bitterly ? */
1461 /* fall through */
1462 goto trunc;
1463 }
1464
1465 trunc:
1466 return -2;
1467 }
1468
1469 int
1470 decode_prefix6(netdissect_options *ndo,
1471 const u_char *pd, u_int itemlen, char *buf, size_t buflen)
1472 {
1473 nd_ipv6 addr;
1474 u_int plen, plenbytes;
1475
1476 ITEMCHECK(1);
1477 plen = GET_U_1(pd);
1478 if (128 < plen)
1479 return -1;
1480 itemlen -= 1;
1481
1482 memset(&addr, 0, sizeof(addr));
1483 plenbytes = (plen + 7) / 8;
1484 ITEMCHECK(plenbytes);
1485 GET_CPY_BYTES(&addr, pd + 1, plenbytes);
1486 if (plen % 8) {
1487 addr[plenbytes - 1] &=
1488 ((0xff00 >> (plen % 8)) & 0xff);
1489 }
1490 snprintf(buf, buflen, "%s/%u", ip6addr_string(ndo, (const u_char *)&addr), plen);
1491 return 1 + plenbytes;
1492
1493 badtlv:
1494 return -2;
1495 }
1496
1497 static int
1498 decode_labeled_prefix6(netdissect_options *ndo,
1499 const u_char *pptr, u_int itemlen, char *buf, size_t buflen)
1500 {
1501 nd_ipv6 addr;
1502 u_int plen, plenbytes;
1503
1504 /* prefix length and label = 4 bytes */
1505 ND_TCHECK_4(pptr);
1506 ITEMCHECK(4);
1507 plen = GET_U_1(pptr); /* get prefix length */
1508
1509 if (24 > plen)
1510 return -1;
1511
1512 plen -= 24; /* adjust prefixlen - labellength */
1513
1514 if (128 < plen)
1515 return -1;
1516 itemlen -= 4;
1517
1518 memset(&addr, 0, sizeof(addr));
1519 plenbytes = (plen + 7) / 8;
1520 GET_CPY_BYTES(&addr, pptr + 4, plenbytes);
1521 if (plen % 8) {
1522 addr[plenbytes - 1] &=
1523 ((0xff00 >> (plen % 8)) & 0xff);
1524 }
1525 /* the label may get offsetted by 4 bits so lets shift it right */
1526 snprintf(buf, buflen, "%s/%u, label:%u %s",
1527 ip6addr_string(ndo, (const u_char *)&addr),
1528 plen,
1529 GET_BE_U_3(pptr + 1)>>4,
1530 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1531
1532 return 4 + plenbytes;
1533
1534 trunc:
1535 return -2;
1536
1537 badtlv:
1538 return -3;
1539 }
1540
1541 static int
1542 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1543 const u_char *pptr, char *buf, size_t buflen)
1544 {
1545 nd_ipv6 addr;
1546 u_int plen;
1547
1548 plen = GET_U_1(pptr); /* get prefix length */
1549
1550 if ((24+64) > plen)
1551 return -1;
1552
1553 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1554
1555 if (128 < plen)
1556 return -1;
1557
1558 memset(&addr, 0, sizeof(addr));
1559 GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
1560 if (plen % 8) {
1561 addr[(plen + 7) / 8 - 1] &=
1562 ((0xff00 >> (plen % 8)) & 0xff);
1563 }
1564 /* the label may get offsetted by 4 bits so lets shift it right */
1565 snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1566 bgp_vpn_rd_print(ndo, pptr+4),
1567 ip6addr_string(ndo, (const u_char *)&addr),
1568 plen,
1569 GET_BE_U_3(pptr + 1)>>4,
1570 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1571
1572 return 12 + (plen + 7) / 8;
1573 }
1574
1575 static int
1576 decode_clnp_prefix(netdissect_options *ndo,
1577 const u_char *pptr, char *buf, size_t buflen)
1578 {
1579 uint8_t addr[19];
1580 u_int plen;
1581
1582 plen = GET_U_1(pptr); /* get prefix length */
1583
1584 if (152 < plen)
1585 return -1;
1586
1587 memset(&addr, 0, sizeof(addr));
1588 GET_CPY_BYTES(&addr, pptr + 4, (plen + 7) / 8);
1589 if (plen % 8) {
1590 addr[(plen + 7) / 8 - 1] &=
1591 ((0xff00 >> (plen % 8)) & 0xff);
1592 }
1593 /* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */
1594 snprintf(buf, buflen, "%s/%u",
1595 isonsap_string(ndo, addr,(plen + 7) / 8),
1596 plen);
1597
1598 return 1 + (plen + 7) / 8;
1599 }
1600
1601 static int
1602 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1603 const u_char *pptr, char *buf, size_t buflen)
1604 {
1605 uint8_t addr[19];
1606 u_int plen;
1607
1608 plen = GET_U_1(pptr); /* get prefix length */
1609
1610 if ((24+64) > plen)
1611 return -1;
1612
1613 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1614
1615 if (152 < plen)
1616 return -1;
1617
1618 memset(&addr, 0, sizeof(addr));
1619 GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
1620 if (plen % 8) {
1621 addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
1622 }
1623 /* the label may get offsetted by 4 bits so lets shift it right */
1624 /* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */
1625 snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1626 bgp_vpn_rd_print(ndo, pptr+4),
1627 isonsap_string(ndo, addr,(plen + 7) / 8),
1628 plen,
1629 GET_BE_U_3(pptr + 1)>>4,
1630 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1631
1632 return 12 + (plen + 7) / 8;
1633 }
1634
1635 /*
1636 * bgp_attr_get_as_size
1637 *
1638 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1639 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1640 * support, exchange AS-Path with the same path-attribute type value 0x02.
1641 */
1642 static u_int
1643 bgp_attr_get_as_size(netdissect_options *ndo,
1644 uint8_t bgpa_type, const u_char *pptr, u_int len)
1645 {
1646 const u_char *tptr = pptr;
1647
1648 /*
1649 * If the path attribute is the optional AS4 path type, then we already
1650 * know, that ASs must be encoded in 4 byte format.
1651 */
1652 if (bgpa_type == BGPTYPE_AS4_PATH) {
1653 return 4;
1654 }
1655
1656 /*
1657 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1658 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1659 * each.
1660 */
1661 while (tptr < pptr + len) {
1662 /*
1663 * If we do not find a valid segment type, our guess might be wrong.
1664 */
1665 if (GET_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || GET_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
1666 goto trunc;
1667 }
1668 tptr += 2 + GET_U_1(tptr + 1) * 2;
1669 }
1670
1671 /*
1672 * If we correctly reached end of the AS path attribute data content,
1673 * then most likely ASs were indeed encoded as 2 bytes.
1674 */
1675 if (tptr == pptr + len) {
1676 return 2;
1677 }
1678
1679 trunc:
1680
1681 /*
1682 * We can come here, either we did not have enough data, or if we
1683 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1684 * so that caller can try to decode each AS as of 4 bytes. If indeed
1685 * there was not enough data, it will crib and end the parse anyways.
1686 */
1687 return 4;
1688 }
1689
1690 /*
1691 * The only way to know that a BGP UPDATE message is using add path is
1692 * by checking if the capability is in the OPEN message which we may have missed.
1693 * So this function checks if it is possible that the update could contain add path
1694 * and if so it checks that standard BGP doesn't make sense.
1695 */
1696 static int
1697 check_add_path(netdissect_options *ndo, const u_char *pptr, u_int length,
1698 u_int max_prefix_length)
1699 {
1700 u_int offset, prefix_length;
1701
1702 if (length < 5) {
1703 return 0;
1704 }
1705
1706 /*
1707 * Scan through the NLRI information under the assumption that
1708 * it doesn't have path IDs.
1709 */
1710 for (offset = 0; offset < length;) {
1711 offset += 4;
1712 if (!ND_TTEST_1(pptr + offset)) {
1713 /* We ran out of captured data; quit scanning. */
1714 break;
1715 }
1716 prefix_length = GET_U_1(pptr + offset);
1717 /*
1718 * Add 4 to cover the path id
1719 * and check the prefix length isn't greater than 32/128.
1720 */
1721 if (prefix_length > max_prefix_length) {
1722 return 0;
1723 }
1724 /* Add 1 for the prefix_length byte and prefix_length to cover the address */
1725 offset += 1 + ((prefix_length + 7) / 8);
1726 }
1727 /* check we haven't gone past the end of the section */
1728 if (offset > length) {
1729 return 0;
1730 }
1731
1732 /* check it's not standard BGP */
1733 for (offset = 0; offset < length; ) {
1734 if (!ND_TTEST_1(pptr + offset)) {
1735 /* We ran out of captured data; quit scanning. */
1736 break;
1737 }
1738 prefix_length = GET_U_1(pptr + offset);
1739 /*
1740 * If the prefix_length is zero (0.0.0.0/0)
1741 * and since it's not the only address (length >= 5)
1742 * then it is add-path
1743 */
1744 if (prefix_length < 1 || prefix_length > max_prefix_length) {
1745 return 1;
1746 }
1747 offset += 1 + ((prefix_length + 7) / 8);
1748 }
1749 if (offset > length) {
1750 return 1;
1751 }
1752
1753 /* assume not add-path by default */
1754 return 0;
1755 }
1756
1757 static int
1758 bgp_mp_af_print(netdissect_options *ndo,
1759 const u_char *tptr, u_int tlen,
1760 uint16_t *afp, uint8_t *safip)
1761 {
1762 uint16_t af;
1763 uint8_t safi;
1764
1765 af = GET_BE_U_2(tptr);
1766 *afp = af;
1767 safi = GET_U_1(tptr + 2);
1768 *safip = safi;
1769
1770 ND_PRINT("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1771 tok2str(af_values, "Unknown AFI", af),
1772 af,
1773 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1774 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1775 safi);
1776
1777 switch(af<<8 | safi) {
1778 case (AFNUM_IP<<8 | SAFNUM_UNICAST):
1779 case (AFNUM_IP<<8 | SAFNUM_MULTICAST):
1780 case (AFNUM_IP<<8 | SAFNUM_UNIMULTICAST):
1781 case (AFNUM_IP<<8 | SAFNUM_LABUNICAST):
1782 case (AFNUM_IP<<8 | SAFNUM_RT_ROUTING_INFO):
1783 case (AFNUM_IP<<8 | SAFNUM_VPNUNICAST):
1784 case (AFNUM_IP<<8 | SAFNUM_VPNMULTICAST):
1785 case (AFNUM_IP<<8 | SAFNUM_VPNUNIMULTICAST):
1786 case (AFNUM_IP<<8 | SAFNUM_MULTICAST_VPN):
1787 case (AFNUM_IP<<8 | SAFNUM_MDT):
1788 case (AFNUM_IP6<<8 | SAFNUM_UNICAST):
1789 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST):
1790 case (AFNUM_IP6<<8 | SAFNUM_UNIMULTICAST):
1791 case (AFNUM_IP6<<8 | SAFNUM_LABUNICAST):
1792 case (AFNUM_IP6<<8 | SAFNUM_VPNUNICAST):
1793 case (AFNUM_IP6<<8 | SAFNUM_VPNMULTICAST):
1794 case (AFNUM_IP6<<8 | SAFNUM_VPNUNIMULTICAST):
1795 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1796 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1797 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1798 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1799 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1800 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1801 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1802 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1803 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1804 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1805 break;
1806 default:
1807 ND_TCHECK_LEN(tptr, tlen);
1808 ND_PRINT("\n\t no AFI %u / SAFI %u decoder", af, safi);
1809 if (ndo->ndo_vflag <= 1)
1810 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1811 return -1;
1812 }
1813 return 0;
1814 trunc:
1815 return -2;
1816 }
1817
1818 static int
1819 bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi,
1820 const u_char *tptr, u_int len,
1821 char *buf, size_t buflen,
1822 int add_path4, int add_path6)
1823 {
1824 int advance;
1825 u_int path_id = 0;
1826
1827 switch (af<<8 | safi) {
1828 case (AFNUM_IP<<8 | SAFNUM_UNICAST):
1829 case (AFNUM_IP<<8 | SAFNUM_MULTICAST):
1830 case (AFNUM_IP<<8 | SAFNUM_UNIMULTICAST):
1831 if (add_path4) {
1832 path_id = GET_BE_U_4(tptr);
1833 tptr += 4;
1834 }
1835 advance = decode_prefix4(ndo, tptr, len, buf, buflen);
1836 if (advance == -1)
1837 ND_PRINT("\n\t (illegal prefix length)");
1838 else if (advance == -2)
1839 break; /* bytes left, but not enough */
1840 else
1841 ND_PRINT("\n\t %s", buf);
1842 if (add_path4) {
1843 ND_PRINT(" Path Id: %u", path_id);
1844 advance += 4;
1845 }
1846 break;
1847 case (AFNUM_IP<<8 | SAFNUM_LABUNICAST):
1848 advance = decode_labeled_prefix4(ndo, tptr, len, buf, buflen);
1849 if (advance == -1)
1850 ND_PRINT("\n\t (illegal prefix length)");
1851 else if (advance == -2)
1852 goto trunc;
1853 else if (advance == -3)
1854 break; /* bytes left, but not enough */
1855 else
1856 ND_PRINT("\n\t %s", buf);
1857 break;
1858 case (AFNUM_IP<<8 | SAFNUM_VPNUNICAST):
1859 case (AFNUM_IP<<8 | SAFNUM_VPNMULTICAST):
1860 case (AFNUM_IP<<8 | SAFNUM_VPNUNIMULTICAST):
1861 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, buflen);
1862 if (advance == -1)
1863 ND_PRINT("\n\t (illegal prefix length)");
1864 else
1865 ND_PRINT("\n\t %s", buf);
1866 break;
1867 case (AFNUM_IP<<8 | SAFNUM_RT_ROUTING_INFO):
1868 advance = decode_rt_routing_info(ndo, tptr);
1869 break;
1870 case (AFNUM_IP<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1871 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST_VPN):
1872 advance = decode_multicast_vpn(ndo, tptr, buf, buflen);
1873 if (advance == -1)
1874 ND_PRINT("\n\t (illegal prefix length)");
1875 else if (advance == -2)
1876 goto trunc;
1877 else
1878 ND_PRINT("\n\t %s", buf);
1879 break;
1880
1881 case (AFNUM_IP<<8 | SAFNUM_MDT):
1882 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, buflen);
1883 if (advance == -1)
1884 ND_PRINT("\n\t (illegal prefix length)");
1885 else if (advance == -2)
1886 goto trunc;
1887 else
1888 ND_PRINT("\n\t %s", buf);
1889 break;
1890 case (AFNUM_IP6<<8 | SAFNUM_UNICAST):
1891 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST):
1892 case (AFNUM_IP6<<8 | SAFNUM_UNIMULTICAST):
1893 if (add_path6) {
1894 path_id = GET_BE_U_4(tptr);
1895 tptr += 4;
1896 }
1897 advance = decode_prefix6(ndo, tptr, len, buf, buflen);
1898 if (advance == -1)
1899 ND_PRINT("\n\t (illegal prefix length)");
1900 else if (advance == -2)
1901 break; /* bytes left, but not enough */
1902 else
1903 ND_PRINT("\n\t %s", buf);
1904 if (add_path6) {
1905 ND_PRINT(" Path Id: %u", path_id);
1906 advance += 4;
1907 }
1908 break;
1909 case (AFNUM_IP6<<8 | SAFNUM_LABUNICAST):
1910 advance = decode_labeled_prefix6(ndo, tptr, len, buf, buflen);
1911 if (advance == -1)
1912 ND_PRINT("\n\t (illegal prefix length)");
1913 else if (advance == -2)
1914 goto trunc;
1915 else if (advance == -3)
1916 break; /* bytes left, but not enough */
1917 else
1918 ND_PRINT("\n\t %s", buf);
1919 break;
1920 case (AFNUM_IP6<<8 | SAFNUM_VPNUNICAST):
1921 case (AFNUM_IP6<<8 | SAFNUM_VPNMULTICAST):
1922 case (AFNUM_IP6<<8 | SAFNUM_VPNUNIMULTICAST):
1923 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, buflen);
1924 if (advance == -1)
1925 ND_PRINT("\n\t (illegal prefix length)");
1926 else
1927 ND_PRINT("\n\t %s", buf);
1928 break;
1929 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1930 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1931 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1932 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1933 advance = decode_labeled_vpn_l2(ndo, tptr, buf, buflen);
1934 if (advance == -1)
1935 ND_PRINT("\n\t (illegal length)");
1936 else if (advance == -2)
1937 goto trunc;
1938 else
1939 ND_PRINT("\n\t %s", buf);
1940 break;
1941 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1942 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1943 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1944 advance = decode_clnp_prefix(ndo, tptr, buf, buflen);
1945 if (advance == -1)
1946 ND_PRINT("\n\t (illegal prefix length)");
1947 else
1948 ND_PRINT("\n\t %s", buf);
1949 break;
1950 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1951 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1952 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1953 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, buflen);
1954 if (advance == -1)
1955 ND_PRINT("\n\t (illegal prefix length)");
1956 else
1957 ND_PRINT("\n\t %s", buf);
1958 break;
1959 default:
1960 /*
1961 * This should not happen, we should have been protected
1962 * by bgp_mp_af_print()'s return value.
1963 */
1964 ND_PRINT("\n\t ERROR: no AFI %u / SAFI %u decoder", af, safi);
1965 advance = -4;
1966 break;
1967 }
1968 return advance;
1969 trunc: /* we rely on the caller to recognize -2 return value */
1970 return -2;
1971 }
1972
1973 static const struct tok bgp_flags[] = {
1974 { 0x80, "O"},
1975 { 0x40, "T"},
1976 { 0x20, "P"},
1977 { 0x10, "E"},
1978 { 0, NULL }
1979 };
1980
1981 static int
1982 bgp_attr_print(netdissect_options *ndo,
1983 uint8_t atype, const u_char *pptr, u_int len,
1984 const unsigned attr_set_level)
1985 {
1986 /* allocate space for the largest possible string */
1987 char astostr[AS_STR_SIZE];
1988 u_int i;
1989 uint16_t af;
1990 uint8_t safi, snpa, nhlen;
1991 int advance;
1992 u_int tlen;
1993 const u_char *tptr;
1994 char buf[512];
1995 u_int as_size;
1996 int add_path4, add_path6;
1997 int ret;
1998
1999 tptr = pptr;
2000 tlen = len;
2001
2002 switch (atype) {
2003 case BGPTYPE_ORIGIN:
2004 if (len != 1)
2005 ND_PRINT("invalid len");
2006 else {
2007 ND_PRINT("%s", tok2str(bgp_origin_values,
2008 "Unknown Origin Typecode",
2009 GET_U_1(tptr)));
2010 }
2011 break;
2012
2013 /*
2014 * Process AS4 byte path and AS2 byte path attributes here.
2015 */
2016 case BGPTYPE_AS4_PATH:
2017 case BGPTYPE_AS_PATH:
2018 if (len % 2) {
2019 ND_PRINT("invalid len");
2020 break;
2021 }
2022 if (!len) {
2023 ND_PRINT("empty");
2024 break;
2025 }
2026
2027 /*
2028 * BGP updates exchanged between New speakers that support 4
2029 * byte AS, ASs are always encoded in 4 bytes. There is no
2030 * definitive way to find this, just by the packet's
2031 * contents. So, check for packet's TLV's sanity assuming
2032 * 2 bytes first, and it does not pass, assume that ASs are
2033 * encoded in 4 bytes format and move on.
2034 */
2035 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
2036
2037 while (tptr < pptr + len) {
2038 ND_PRINT("%s", tok2str(bgp_as_path_segment_open_values,
2039 "?", GET_U_1(tptr)));
2040 for (i = 0; i < GET_U_1(tptr + 1) * as_size; i += as_size) {
2041 ND_TCHECK_LEN(tptr + 2 + i, as_size);
2042 ND_PRINT("%s ",
2043 as_printf(ndo, astostr, sizeof(astostr),
2044 as_size == 2 ?
2045 GET_BE_U_2(tptr + i + 2) :
2046 GET_BE_U_4(tptr + i + 2)));
2047 }
2048 ND_PRINT("%s", tok2str(bgp_as_path_segment_close_values,
2049 "?", GET_U_1(tptr)));
2050 tptr += 2 + GET_U_1(tptr + 1) * as_size;
2051 }
2052 break;
2053 case BGPTYPE_NEXT_HOP:
2054 if (len != 4)
2055 ND_PRINT("invalid len");
2056 else {
2057 ND_PRINT("%s", GET_IPADDR_STRING(tptr));
2058 }
2059 break;
2060 case BGPTYPE_MULTI_EXIT_DISC:
2061 case BGPTYPE_LOCAL_PREF:
2062 if (len != 4)
2063 ND_PRINT("invalid len");
2064 else {
2065 ND_PRINT("%u", GET_BE_U_4(tptr));
2066 }
2067 break;
2068 case BGPTYPE_ATOMIC_AGGREGATE:
2069 if (len != 0)
2070 ND_PRINT("invalid len");
2071 break;
2072 case BGPTYPE_AGGREGATOR:
2073
2074 /*
2075 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
2076 * the length of this PA can be either 6 bytes or 8 bytes.
2077 */
2078 if (len != 6 && len != 8) {
2079 ND_PRINT("invalid len");
2080 break;
2081 }
2082 ND_TCHECK_LEN(tptr, len);
2083 if (len == 6) {
2084 ND_PRINT(" AS #%s, origin %s",
2085 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(tptr)),
2086 GET_IPADDR_STRING(tptr + 2));
2087 } else {
2088 ND_PRINT(" AS #%s, origin %s",
2089 as_printf(ndo, astostr, sizeof(astostr),
2090 GET_BE_U_4(tptr)), GET_IPADDR_STRING(tptr + 4));
2091 }
2092 break;
2093 case BGPTYPE_AGGREGATOR4:
2094 if (len != 8) {
2095 ND_PRINT("invalid len");
2096 break;
2097 }
2098 ND_PRINT(" AS #%s, origin %s",
2099 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)),
2100 GET_IPADDR_STRING(tptr + 4));
2101 break;
2102 case BGPTYPE_COMMUNITIES:
2103 if (len % 4) {
2104 ND_PRINT("invalid len");
2105 break;
2106 }
2107 while (tlen != 0) {
2108 uint32_t comm;
2109 ND_TCHECK_4(tptr);
2110 if (tlen < 4)
2111 goto trunc;
2112 comm = GET_BE_U_4(tptr);
2113 switch (comm) {
2114 case BGP_COMMUNITY_NO_EXPORT:
2115 ND_PRINT(" NO_EXPORT");
2116 break;
2117 case BGP_COMMUNITY_NO_ADVERT:
2118 ND_PRINT(" NO_ADVERTISE");
2119 break;
2120 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
2121 ND_PRINT(" NO_EXPORT_SUBCONFED");
2122 break;
2123 default:
2124 ND_PRINT("%u:%u%s",
2125 (comm >> 16) & 0xffff,
2126 comm & 0xffff,
2127 (tlen>4) ? ", " : "");
2128 break;
2129 }
2130 tlen -=4;
2131 tptr +=4;
2132 }
2133 break;
2134 case BGPTYPE_ORIGINATOR_ID:
2135 if (len != 4) {
2136 ND_PRINT("invalid len");
2137 break;
2138 }
2139 ND_PRINT("%s",GET_IPADDR_STRING(tptr));
2140 break;
2141 case BGPTYPE_CLUSTER_LIST:
2142 if (len % 4) {
2143 ND_PRINT("invalid len");
2144 break;
2145 }
2146 while (tlen != 0) {
2147 if (tlen < 4)
2148 goto trunc;
2149 ND_PRINT("%s%s",
2150 GET_IPADDR_STRING(tptr),
2151 (tlen>4) ? ", " : "");
2152 tlen -=4;
2153 tptr +=4;
2154 }
2155 break;
2156 case BGPTYPE_MP_REACH_NLRI:
2157 ND_TCHECK_3(tptr);
2158 if (tlen < 3)
2159 goto trunc;
2160 ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
2161 if (ret == -2)
2162 goto trunc;
2163 if (ret < 0)
2164 break;
2165
2166 tptr += 3;
2167 tlen -= 3;
2168
2169 ND_TCHECK_1(tptr);
2170 if (tlen < 1)
2171 goto trunc;
2172 nhlen = GET_U_1(tptr);
2173 tptr++;
2174 tlen--;
2175
2176 if (nhlen) {
2177 u_int nnh = 0;
2178 uint8_t tnhlen = nhlen;
2179 if (tlen < tnhlen)
2180 goto trunc;
2181 ND_PRINT("\n\t nexthop: ");
2182 while (tnhlen != 0) {
2183 if (nnh++ > 0) {
2184 ND_PRINT(", " );
2185 }
2186 switch(af<<8 | safi) {
2187 case (AFNUM_IP<<8 | SAFNUM_UNICAST):
2188 case (AFNUM_IP<<8 | SAFNUM_MULTICAST):
2189 case (AFNUM_IP<<8 | SAFNUM_UNIMULTICAST):
2190 case (AFNUM_IP<<8 | SAFNUM_LABUNICAST):
2191 case (AFNUM_IP<<8 | SAFNUM_RT_ROUTING_INFO):
2192 case (AFNUM_IP<<8 | SAFNUM_MULTICAST_VPN):
2193 case (AFNUM_IP<<8 | SAFNUM_MDT):
2194 if (tnhlen < sizeof(nd_ipv4)) {
2195 ND_PRINT("invalid len");
2196 tptr += tnhlen;
2197 tlen -= tnhlen;
2198 tnhlen = 0;
2199 } else {
2200 ND_PRINT("%s",GET_IPADDR_STRING(tptr));
2201 tptr += sizeof(nd_ipv4);
2202 tnhlen -= sizeof(nd_ipv4);
2203 tlen -= sizeof(nd_ipv4);
2204 }
2205 break;
2206 case (AFNUM_IP<<8 | SAFNUM_VPNUNICAST):
2207 case (AFNUM_IP<<8 | SAFNUM_VPNMULTICAST):
2208 case (AFNUM_IP<<8 | SAFNUM_VPNUNIMULTICAST):
2209 if (tnhlen < sizeof(nd_ipv4)+BGP_VPN_RD_LEN) {
2210 ND_PRINT("invalid len");
2211 tptr += tnhlen;
2212 tlen -= tnhlen;
2213 tnhlen = 0;
2214 } else {
2215 ND_PRINT("RD: %s, %s",
2216 bgp_vpn_rd_print(ndo, tptr),
2217 GET_IPADDR_STRING(tptr+BGP_VPN_RD_LEN));
2218 tptr += (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2219 tlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2220 tnhlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2221 }
2222 break;
2223 case (AFNUM_IP6<<8 | SAFNUM_UNICAST):
2224 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST):
2225 case (AFNUM_IP6<<8 | SAFNUM_UNIMULTICAST):
2226 case (AFNUM_IP6<<8 | SAFNUM_LABUNICAST):
2227 if (tnhlen < sizeof(nd_ipv6)) {
2228 ND_PRINT("invalid len");
2229 tptr += tnhlen;
2230 tlen -= tnhlen;
2231 tnhlen = 0;
2232 } else {
2233 ND_PRINT("%s", GET_IP6ADDR_STRING(tptr));
2234 tptr += sizeof(nd_ipv6);
2235 tlen -= sizeof(nd_ipv6);
2236 tnhlen -= sizeof(nd_ipv6);
2237 }
2238 break;
2239 case (AFNUM_IP6<<8 | SAFNUM_VPNUNICAST):
2240 case (AFNUM_IP6<<8 | SAFNUM_VPNMULTICAST):
2241 case (AFNUM_IP6<<8 | SAFNUM_VPNUNIMULTICAST):
2242 if (tnhlen < sizeof(nd_ipv6)+BGP_VPN_RD_LEN) {
2243 ND_PRINT("invalid len");
2244 tptr += tnhlen;
2245 tlen -= tnhlen;
2246 tnhlen = 0;
2247 } else {
2248 ND_PRINT("RD: %s, %s",
2249 bgp_vpn_rd_print(ndo, tptr),
2250 GET_IP6ADDR_STRING(tptr+BGP_VPN_RD_LEN));
2251 tptr += (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2252 tlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2253 tnhlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2254 }
2255 break;
2256 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
2257 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2258 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2259 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2260 if (tnhlen < sizeof(nd_ipv4)) {
2261 ND_PRINT("invalid len");
2262 tptr += tnhlen;
2263 tlen -= tnhlen;
2264 tnhlen = 0;
2265 } else {
2266 ND_PRINT("%s", GET_IPADDR_STRING(tptr));
2267 tptr += (sizeof(nd_ipv4));
2268 tlen -= (sizeof(nd_ipv4));
2269 tnhlen -= (sizeof(nd_ipv4));
2270 }
2271 break;
2272 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2273 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2274 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2275 ND_PRINT("%s", GET_ISONSAP_STRING(tptr, tnhlen));
2276 tptr += tnhlen;
2277 tlen -= tnhlen;
2278 tnhlen = 0;
2279 break;
2280
2281 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2282 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2283 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2284 if (tnhlen < BGP_VPN_RD_LEN+1) {
2285 ND_PRINT("invalid len");
2286 tptr += tnhlen;
2287 tlen -= tnhlen;
2288 tnhlen = 0;
2289 } else {
2290 ND_TCHECK_LEN(tptr, tnhlen);
2291 ND_PRINT("RD: %s, %s",
2292 bgp_vpn_rd_print(ndo, tptr),
2293 GET_ISONSAP_STRING(tptr+BGP_VPN_RD_LEN,tnhlen-BGP_VPN_RD_LEN));
2294 /* rfc986 mapped IPv4 address ? */
2295 if (GET_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
2296 ND_PRINT(" = %s", GET_IPADDR_STRING(tptr+BGP_VPN_RD_LEN+4));
2297 /* rfc1888 mapped IPv6 address ? */
2298 else if (GET_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
2299 ND_PRINT(" = %s", GET_IP6ADDR_STRING(tptr+BGP_VPN_RD_LEN+3));
2300 tptr += tnhlen;
2301 tlen -= tnhlen;
2302 tnhlen = 0;
2303 }
2304 break;
2305 default:
2306 /*
2307 * bgp_mp_af_print() should have saved us from
2308 * an unsupported AFI/SAFI.
2309 */
2310 ND_PRINT("ERROR: no AFI %u/SAFI %u nexthop decoder", af, safi);
2311 tptr += tnhlen;
2312 tlen -= tnhlen;
2313 tnhlen = 0;
2314 goto done;
2315 break;
2316 }
2317 }
2318 }
2319 ND_PRINT(", nh-length: %u", nhlen);
2320
2321 /* As per RFC 2858; this is reserved in RFC 4760 */
2322 if (tlen < 1)
2323 goto trunc;
2324 snpa = GET_U_1(tptr);
2325 tptr++;
2326 tlen--;
2327
2328 if (snpa) {
2329 ND_PRINT("\n\t %u SNPA", snpa);
2330 for (/*nothing*/; snpa != 0; snpa--) {
2331 uint8_t snpalen;
2332 if (tlen < 1)
2333 goto trunc;
2334 snpalen = GET_U_1(tptr);
2335 ND_PRINT("\n\t %u bytes", snpalen);
2336 tptr++;
2337 tlen--;
2338 if (tlen < snpalen)
2339 goto trunc;
2340 ND_TCHECK_LEN(tptr, snpalen);
2341 tptr += snpalen;
2342 tlen -= snpalen;
2343 }
2344 } else {
2345 ND_PRINT(", no SNPA");
2346 }
2347
2348 add_path4 = check_add_path(ndo, tptr,
2349 (len-ND_BYTES_BETWEEN(pptr, tptr)), 32);
2350 add_path6 = check_add_path(ndo, tptr,
2351 (len-ND_BYTES_BETWEEN(pptr, tptr)), 128);
2352
2353 while (tptr < pptr + len) {
2354 advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf),
2355 add_path4, add_path6);
2356 if (advance == -2)
2357 goto trunc;
2358 if (advance < 0)
2359 break;
2360 tptr += advance;
2361 }
2362 break;
2363
2364 case BGPTYPE_MP_UNREACH_NLRI:
2365 ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
2366 ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
2367 if (ret == -2)
2368 goto trunc;
2369 if (ret < 0)
2370 break;
2371
2372 if (len == BGP_MP_NLRI_MINSIZE)
2373 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2374
2375 tptr += 3;
2376
2377 add_path4 = check_add_path(ndo, tptr,
2378 (len-ND_BYTES_BETWEEN(pptr, tptr)), 32);
2379 add_path6 = check_add_path(ndo, tptr,
2380 (len-ND_BYTES_BETWEEN(pptr, tptr)), 128);
2381
2382 while (tptr < pptr + len) {
2383 advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf),
2384 add_path4, add_path6);
2385 if (advance == -2)
2386 goto trunc;
2387 if (advance < 0)
2388 break;
2389 tptr += advance;
2390 }
2391 break;
2392 case BGPTYPE_EXTD_COMMUNITIES:
2393 if (len % 8) {
2394 ND_PRINT("invalid len");
2395 break;
2396 }
2397 while (tlen != 0) {
2398 uint16_t extd_comm;
2399
2400 ND_TCHECK_2(tptr);
2401 if (tlen < 2)
2402 goto trunc;
2403 extd_comm=GET_BE_U_2(tptr);
2404
2405 ND_PRINT("\n\t %s (0x%04x), Flags [%s]",
2406 tok2str(bgp_extd_comm_subtype_values,
2407 "unknown extd community typecode",
2408 extd_comm),
2409 extd_comm,
2410 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm));
2411
2412 ND_TCHECK_8(tptr);
2413 if (tlen < 8)
2414 goto trunc;
2415 ND_PRINT(": ");
2416 bgp_extended_community_print(ndo, tptr);
2417 tlen -= 8;
2418 tptr += 8;
2419 }
2420 break;
2421
2422 case BGPTYPE_PMSI_TUNNEL:
2423 {
2424 uint8_t tunnel_type, flags;
2425
2426 ND_TCHECK_5(tptr);
2427 if (tlen < 5)
2428 goto trunc;
2429 flags = GET_U_1(tptr);
2430 tunnel_type = GET_U_1(tptr + 1);
2431
2432 ND_PRINT("\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2433 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2434 tunnel_type,
2435 bittok2str(bgp_pmsi_flag_values, "none", flags),
2436 GET_BE_U_3(tptr + 2)>>4);
2437
2438 tptr +=5;
2439 tlen -= 5;
2440
2441 switch (tunnel_type) {
2442 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2443 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2444 ND_PRINT("\n\t Sender %s, P-Group %s",
2445 GET_IPADDR_STRING(tptr),
2446 GET_IPADDR_STRING(tptr+4));
2447 break;
2448
2449 case BGP_PMSI_TUNNEL_PIM_SSM:
2450 ND_PRINT("\n\t Root-Node %s, P-Group %s",
2451 GET_IPADDR_STRING(tptr),
2452 GET_IPADDR_STRING(tptr+4));
2453 break;
2454 case BGP_PMSI_TUNNEL_INGRESS:
2455 ND_PRINT("\n\t Tunnel-Endpoint %s",
2456 GET_IPADDR_STRING(tptr));
2457 break;
2458 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2459 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2460 ND_PRINT("\n\t Root-Node %s, LSP-ID 0x%08x",
2461 GET_IPADDR_STRING(tptr),
2462 GET_BE_U_4(tptr + 4));
2463 break;
2464 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2465 ND_PRINT("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2466 GET_IPADDR_STRING(tptr),
2467 GET_BE_U_4(tptr + 4));
2468 break;
2469 default:
2470 if (ndo->ndo_vflag <= 1) {
2471 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2472 }
2473 }
2474 break;
2475 }
2476 case BGPTYPE_AIGP:
2477 {
2478 uint8_t type;
2479 uint16_t length;
2480
2481 while (tlen >= 3) {
2482 type = GET_U_1(tptr);
2483 length = GET_BE_U_2(tptr + 1);
2484 tptr += 3;
2485 tlen -= 3;
2486
2487 ND_PRINT("\n\t %s TLV (%u), length %u",
2488 tok2str(bgp_aigp_values, "Unknown", type),
2489 type, length);
2490
2491 if (length < 3)
2492 goto trunc;
2493 length -= 3;
2494
2495 /*
2496 * Check if we can read the TLV data.
2497 */
2498 if (tlen < length)
2499 goto trunc;
2500
2501 switch (type) {
2502
2503 case BGP_AIGP_TLV:
2504 if (length < 8)
2505 goto trunc;
2506 ND_PRINT(", metric %" PRIu64,
2507 GET_BE_U_8(tptr));
2508 break;
2509
2510 default:
2511 if (ndo->ndo_vflag <= 1) {
2512 print_unknown_data(ndo, tptr,"\n\t ", length);
2513 }
2514 }
2515
2516 tptr += length;
2517 tlen -= length;
2518 }
2519 break;
2520 }
2521 case BGPTYPE_ATTR_SET:
2522 ND_TCHECK_4(tptr);
2523 if (len < 4)
2524 goto trunc;
2525 ND_PRINT("\n\t Origin AS: %s",
2526 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)));
2527 tptr += 4;
2528 len -= 4;
2529
2530 while (len) {
2531 u_int aflags, alenlen, alen;
2532
2533 ND_TCHECK_2(tptr);
2534 if (len < 2) {
2535 ND_PRINT(" [path attr too short]");
2536 tptr += len;
2537 break;
2538 }
2539 aflags = GET_U_1(tptr);
2540 atype = GET_U_1(tptr + 1);
2541 tptr += 2;
2542 len -= 2;
2543 alenlen = bgp_attr_lenlen(aflags, tptr);
2544 ND_TCHECK_LEN(tptr, alenlen);
2545 if (len < alenlen) {
2546 ND_PRINT(" [path attr too short]");
2547 tptr += len;
2548 break;
2549 }
2550 alen = bgp_attr_len(aflags, tptr);
2551 tptr += alenlen;
2552 len -= alenlen;
2553
2554 ND_PRINT("\n\t %s (%u), length: %u",
2555 tok2str(bgp_attr_values,
2556 "Unknown Attribute", atype),
2557 atype,
2558 alen);
2559
2560 if (aflags) {
2561 ND_PRINT(", Flags [%s",
2562 bittok2str_nosep(bgp_flags, "", aflags));
2563 if (aflags & 0xf)
2564 ND_PRINT("+%x", aflags & 0xf);
2565 ND_PRINT("]");
2566 }
2567 ND_PRINT(": ");
2568 if (len < alen) {
2569 ND_PRINT(" [path attr too short]");
2570 tptr += len;
2571 break;
2572 }
2573 /*
2574 * The protocol encoding per se allows ATTR_SET to be nested
2575 * as many times as the message can accommodate. This printer
2576 * used to be able to recurse into ATTR_SET contents until the
2577 * stack exhaustion, but now there is a limit on that (if live
2578 * protocol exchange goes that many levels deep, something is
2579 * probably wrong anyway). Feel free to refine this value if
2580 * you can find the spec with respective normative text.
2581 */
2582 if (attr_set_level == 10)
2583 ND_PRINT("(too many nested levels, not recursing)");
2584 else if (!bgp_attr_print(ndo, atype, tptr, alen, attr_set_level + 1))
2585 return 0;
2586 tptr += alen;
2587 len -= alen;
2588 }
2589 break;
2590
2591 case BGPTYPE_LARGE_COMMUNITY:
2592 if (len == 0 || len % 12) {
2593 ND_PRINT("invalid len");
2594 break;
2595 }
2596 ND_PRINT("\n\t ");
2597 while (len != 0) {
2598 ND_PRINT("%u:%u:%u%s",
2599 GET_BE_U_4(tptr),
2600 GET_BE_U_4(tptr + 4),
2601 GET_BE_U_4(tptr + 8),
2602 (len > 12) ? ", " : "");
2603 tptr += 12;
2604 /*
2605 * len will always be a multiple of 12, as per the above,
2606 * so this will never underflow.
2607 */
2608 len -= 12;
2609 }
2610 break;
2611 case BGPTYPE_BGPSEC_PATH:
2612 {
2613 uint16_t sblen, splen;
2614
2615 splen = GET_BE_U_2(tptr);
2616
2617 /*
2618 * A secure path has a minimum length of 8 bytes:
2619 * 2 bytes length field
2620 * 6 bytes per secure path segment
2621 */
2622 ND_ICHECKMSG_U("secure path length", splen, <, 8);
2623
2624 ND_PRINT("\n\t Secure Path Length: %u", splen);
2625
2626 tptr += 2;
2627 splen -= 2;
2628 /* Make sure the secure path length does not signal trailing bytes */
2629 if (splen % 6) {
2630 ND_PRINT(" [total segments length %u != N x 6]", splen);
2631 goto invalid;
2632 }
2633
2634 /* Parse secure path segments */
2635 while (splen != 0) {
2636 uint8_t pcount = GET_U_1(tptr);
2637 uint8_t flags = GET_U_1(tptr + 1);
2638 uint32_t asn = GET_BE_U_4(tptr + 2);
2639 ND_PRINT("\n\t Secure Path Segment: pCount: %u, Flags: [%s] (0x%02x), AS: %u",
2640 pcount,
2641 bittok2str(bgp_bgpsec_bitmap_str, "none", flags),
2642 flags,
2643 asn);
2644 tptr += 6;
2645 splen -= 6;
2646 }
2647
2648 sblen = GET_BE_U_2(tptr);
2649
2650 ND_PRINT("\n\t Signature Block: Length: %u, Algo ID: %u",
2651 sblen,
2652 GET_U_1(tptr + 2));
2653
2654 tptr += 3;
2655 sblen -= 3;
2656 /* Parse signature segments */
2657 while (sblen > 0) {
2658 uint16_t siglen;
2659
2660 ND_PRINT("\n\t Signature Segment:\n\t SKI: ");
2661 ND_ICHECKMSG_U("remaining length", sblen, <, 20);
2662 hex_print(ndo, "\n\t ", tptr, 20);
2663 tptr += 20;
2664 sblen -= 20;
2665 ND_ICHECKMSG_U("remaining length", sblen, <, 2);
2666 siglen = GET_BE_U_2(tptr);
2667 tptr += 2;
2668 sblen -= 2;
2669
2670 ND_PRINT("\n\t Length: %u", siglen);
2671 ND_ICHECKMSG_U("remaining length", sblen, <, siglen);
2672 ND_PRINT("\n\t Signature:");
2673 hex_print(ndo, "\n\t ", tptr, siglen);
2674 tptr += siglen;
2675 sblen -= siglen;
2676 }
2677 break;
2678 }
2679 case BGPTYPE_OTC:
2680 {
2681 if (len < 4) {
2682 ND_PRINT("invalid len");
2683 break;
2684 }
2685 ND_PRINT("\n\t OTC %u", GET_BE_U_4(pptr));
2686 break;
2687 }
2688 default:
2689 ND_TCHECK_LEN(pptr, len);
2690 ND_PRINT("\n\t no Attribute %u decoder", atype); /* we have no decoder for the attribute */
2691 if (ndo->ndo_vflag <= 1)
2692 print_unknown_data(ndo, pptr, "\n\t ", len);
2693 break;
2694 }
2695 done:
2696 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2697 ND_TCHECK_LEN(pptr, len);
2698 print_unknown_data(ndo, pptr, "\n\t ", len);
2699 }
2700 return 1;
2701
2702 invalid:
2703 nd_print_invalid(ndo);
2704 return 1;
2705
2706 trunc:
2707 return 0;
2708 }
2709
2710 static void
2711 bgp_capabilities_print(netdissect_options *ndo,
2712 const u_char *opt, u_int caps_len)
2713 {
2714 /* allocate space for the largest possible string */
2715 char astostr[AS_STR_SIZE];
2716 u_int cap_type, cap_len, tcap_len, cap_offset;
2717 u_int i = 0;
2718
2719 while (i < caps_len) {
2720 ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
2721 cap_type=GET_U_1(opt + i);
2722 cap_len=GET_U_1(opt + i + 1);
2723 ND_PRINT("\n\t %s (%u), length: %u",
2724 tok2str(bgp_capcode_values, "Unknown", cap_type),
2725 cap_type,
2726 cap_len);
2727 ND_TCHECK_LEN(opt + 2 + i, cap_len);
2728 switch (cap_type) {
2729 case BGP_CAPCODE_MP:
2730 /* AFI (16 bits), Reserved (8 bits), SAFI (8 bits) */
2731 if (cap_len < 4) {
2732 ND_PRINT(" (too short, < 4)");
2733 return;
2734 }
2735 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u)",
2736 tok2str(af_values, "Unknown", GET_BE_U_2(opt + i + 2)),
2737 GET_BE_U_2(opt + i + 2),
2738 tok2str(bgp_safi_values, "Unknown", GET_U_1(opt + i + 5)),
2739 GET_U_1(opt + i + 5));
2740 break;
2741 case BGP_CAPCODE_BGPSEC:
2742 /* Version (4 bits), Direction (1 bit), Flags (3 bits), AFI (16 bits) */
2743 cap_offset = 1;
2744 /* The capability length [...] MUST be set to 3. */
2745 if (cap_len != 3) {
2746 ND_PRINT(" [%u != 3]", cap_len);
2747 return;
2748 }
2749
2750 ND_PRINT("\n\t\tVersion %u, Direction %s (%u), AFI %s (%u)",
2751 GET_U_1(opt + i + 2)&0xf0,
2752 (GET_U_1(opt + i + 2)&0x08) ? "Send" : "Receive",
2753 (GET_U_1(opt + i + 2)&0x08)>>3,
2754 bittok2str(af_values, "Unknown",
2755 GET_BE_U_2(opt + i + cap_offset + 2)),
2756 GET_BE_U_2(opt + i + cap_offset + 2));
2757 break;
2758 case BGP_CAPCODE_ML:
2759 cap_offset = 2;
2760 tcap_len = cap_len;
2761 while (tcap_len >= 4) {
2762 ND_PRINT( "\n\t\tAFI %s (%u), SAFI %s (%u), Count: %u",
2763 tok2str(af_values, "Unknown",
2764 GET_BE_U_2(opt + i + cap_offset)),
2765 GET_BE_U_2(opt + i + cap_offset),
2766 tok2str(bgp_safi_values, "Unknown",
2767 GET_U_1(opt + i + cap_offset + 2)),
2768 GET_U_1(opt + i + cap_offset + 2),
2769 GET_U_1(opt + i + cap_offset + 3));
2770 tcap_len -= 4;
2771 cap_offset += 4;
2772 }
2773 break;
2774 case BGP_CAPCODE_RESTART:
2775 /* Restart Flags (4 bits), Restart Time in seconds (12 bits) */
2776 if (cap_len < 2) {
2777 ND_PRINT(" (too short, < 2)");
2778 return;
2779 }
2780 tcap_len=cap_len;
2781 ND_PRINT("\n\t\tRestart Flags: [%s], Restart Time %us",
2782 bittok2str(bgp_graceful_restart_comm_flag_values,
2783 "none", GET_U_1(opt + i + 2) >> 4),
2784 GET_BE_U_2(opt + i + 2)&0xfff);
2785 tcap_len-=2;
2786 cap_offset=4;
2787 while(tcap_len>=4) {
2788 ND_PRINT("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2789 tok2str(af_values,"Unknown",
2790 GET_BE_U_2(opt + i + cap_offset)),
2791 GET_BE_U_2(opt + i + cap_offset),
2792 tok2str(bgp_safi_values,"Unknown",
2793 GET_U_1(opt + i + cap_offset + 2)),
2794 GET_U_1(opt + (i + cap_offset + 2)),
2795 ((GET_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" );
2796 tcap_len -= 4;
2797 cap_offset += 4;
2798 }
2799 break;
2800 case BGP_CAPCODE_ROLE:
2801 if (cap_len < 1) {
2802 ND_PRINT(" (too short, < 1)");
2803 return;
2804 }
2805 ND_PRINT("\n\t\tRole name %s (%u)",
2806 tok2str(bgp_role_values, "Unassigned",
2807 GET_U_1(opt + i + 2)), GET_U_1(opt + i + 2));
2808 break;
2809 case BGP_CAPCODE_RR:
2810 case BGP_CAPCODE_LLGR:
2811 case BGP_CAPCODE_RR_CISCO:
2812 case BGP_CAPCODE_EXT_MSG:
2813 case BGP_CAPCODE_ENH_RR:
2814 break;
2815 case BGP_CAPCODE_AS_NEW:
2816 /*
2817 * Extract the 4 byte AS number encoded.
2818 */
2819 if (cap_len < 4) {
2820 ND_PRINT(" (too short, < 4)");
2821 return;
2822 }
2823 ND_PRINT("\n\t\t 4 Byte AS %s",
2824 as_printf(ndo, astostr, sizeof(astostr),
2825 GET_BE_U_4(opt + i + 2)));
2826 break;
2827 case BGP_CAPCODE_ADD_PATH:
2828 if (cap_len == 0) {
2829 ND_PRINT(" (bogus)"); /* length */
2830 break;
2831 }
2832 tcap_len=cap_len;
2833 cap_offset=2;
2834 while (tcap_len != 0) {
2835 if (tcap_len < 4) {
2836 nd_print_invalid(ndo);
2837 break;
2838 }
2839 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2840 tok2str(af_values,"Unknown",GET_BE_U_2(opt + i + cap_offset)),
2841 GET_BE_U_2(opt + i + cap_offset),
2842 tok2str(bgp_safi_values,"Unknown",GET_U_1(opt + i + cap_offset + 2)),
2843 GET_U_1(opt + (i + cap_offset + 2)),
2844 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",GET_U_1(opt + i + cap_offset + 3))
2845 );
2846 tcap_len -= 4;
2847 cap_offset += 4;
2848 }
2849 break;
2850 default:
2851 ND_PRINT("\n\t\tno decoder for Capability %u",
2852 cap_type);
2853 if (ndo->ndo_vflag <= 1)
2854 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2855 cap_len);
2856 break;
2857 }
2858 if (ndo->ndo_vflag > 1 && cap_len != 0) {
2859 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2860 }
2861 i += BGP_CAP_HEADER_SIZE + cap_len;
2862 }
2863 return;
2864
2865 trunc:
2866 nd_print_trunc(ndo);
2867 }
2868
2869 static void
2870 bgp_open_print(netdissect_options *ndo,
2871 const u_char *dat, u_int length)
2872 {
2873 /* allocate space for the largest possible string */
2874 char astostr[AS_STR_SIZE];
2875 const struct bgp_open *bgp_open_header;
2876 u_int optslen;
2877 uint8_t opsttype;
2878 const struct bgp_opt *bgpopt;
2879 const u_char *opt;
2880 u_int i;
2881 uint8_t extended_opt_params = 0;
2882 u_int open_size = BGP_OPEN_SIZE;
2883 u_int opt_size = BGP_OPT_SIZE;
2884
2885 ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
2886 if (length < BGP_OPEN_SIZE)
2887 goto trunc;
2888
2889 bgp_open_header = (const struct bgp_open *)dat;
2890
2891 ND_PRINT("\n\t Version %u, ",
2892 GET_U_1(bgp_open_header->bgpo_version));
2893 ND_PRINT("my AS %s, ",
2894 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(bgp_open_header->bgpo_myas)));
2895 ND_PRINT("Holdtime %us, ",
2896 GET_BE_U_2(bgp_open_header->bgpo_holdtime));
2897 ND_PRINT("ID %s", GET_IPADDR_STRING(bgp_open_header->bgpo_id));
2898 optslen = GET_U_1(bgp_open_header->bgpo_optlen);
2899 opsttype = GET_U_1(bgp_open_header->bgpo_opttype);
2900 if (opsttype == BGP_OPEN_NON_EXT_OPT_TYPE_EXTENDED_LENGTH) {
2901 optslen = GET_BE_U_2(bgp_open_header->bgpo_optlen_extended);
2902 extended_opt_params = 1;
2903 open_size += 3;
2904 opt_size += 1;
2905 }
2906 ND_PRINT("\n\t Optional parameters%s, length: %u",
2907 extended_opt_params ? " (Extended)" : "", optslen);
2908
2909 opt = dat + open_size;
2910 length -= open_size;
2911
2912 i = 0;
2913 while (i < optslen) {
2914 uint8_t opt_type;
2915 uint16_t opt_len;
2916
2917 ND_TCHECK_LEN(opt + i, opt_size);
2918 if (length < opt_size + i)
2919 goto trunc;
2920 bgpopt = (const struct bgp_opt *)(opt + i);
2921 opt_type = GET_U_1(bgpopt->bgpopt_type);
2922 opt_len = extended_opt_params ? GET_BE_U_2(bgpopt->bgpopt_len)
2923 : GET_U_1(bgpopt->bgpopt_len);
2924 if (opt_size + i + opt_len > optslen) {
2925 ND_PRINT("\n\t Option %u, length: %u, goes past the end of the options",
2926 opt_type, opt_len);
2927 break;
2928 }
2929
2930 ND_PRINT("\n\t Option %s (%u), length: %u",
2931 tok2str(bgp_opt_values,"Unknown",opt_type),
2932 opt_type,
2933 opt_len);
2934
2935 /* now let's decode the options we know*/
2936 switch(opt_type) {
2937
2938 case BGP_OPT_CAP:
2939 bgp_capabilities_print(ndo, opt + opt_size + i,
2940 opt_len);
2941 break;
2942
2943 case BGP_OPT_AUTH:
2944 default:
2945 ND_PRINT("\n\t no decoder for option %u",
2946 opt_type);
2947 break;
2948 }
2949 i += opt_size + opt_len;
2950 }
2951 return;
2952 trunc:
2953 nd_print_trunc(ndo);
2954 }
2955
2956 static void
2957 bgp_update_print(netdissect_options *ndo,
2958 const u_char *dat, u_int length)
2959 {
2960 const u_char *p;
2961 u_int withdrawn_routes_len;
2962 char buf[512];
2963 int wpfx;
2964 u_int len;
2965 int i;
2966 int add_path;
2967 u_int path_id = 0;
2968
2969 ND_TCHECK_LEN(dat, BGP_SIZE);
2970 if (length < BGP_SIZE)
2971 goto trunc;
2972 p = dat + BGP_SIZE;
2973 length -= BGP_SIZE;
2974
2975 /* Unfeasible routes */
2976 ND_TCHECK_2(p);
2977 if (length < 2)
2978 goto trunc;
2979 withdrawn_routes_len = GET_BE_U_2(p);
2980 p += 2;
2981 length -= 2;
2982 if (withdrawn_routes_len > 1) {
2983 /*
2984 * Without keeping state from the original NLRI message,
2985 * it's not possible to tell if this a v4 or v6 route,
2986 * so only try to decode it if we're not v6 enabled.
2987 */
2988 ND_TCHECK_LEN(p, withdrawn_routes_len);
2989 if (length < withdrawn_routes_len)
2990 goto trunc;
2991 ND_PRINT("\n\t Withdrawn routes:");
2992 add_path = check_add_path(ndo, p, withdrawn_routes_len, 32);
2993 while (withdrawn_routes_len != 0) {
2994 if (add_path) {
2995 if (withdrawn_routes_len < 4) {
2996 p += withdrawn_routes_len;
2997 length -= withdrawn_routes_len;
2998 break;
2999 }
3000 path_id = GET_BE_U_4(p);
3001 p += 4;
3002 length -= 4;
3003 withdrawn_routes_len -= 4;
3004 }
3005 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
3006 if (wpfx == -1) {
3007 ND_PRINT("\n\t (illegal prefix length)");
3008 break;
3009 } else if (wpfx == -2)
3010 goto trunc; /* bytes left, but not enough */
3011 else {
3012 ND_PRINT("\n\t %s", buf);
3013 if (add_path) {
3014 ND_PRINT(" Path Id: %u", path_id);
3015 }
3016 p += wpfx;
3017 length -= wpfx;
3018 withdrawn_routes_len -= wpfx;
3019 }
3020 }
3021 } else {
3022 ND_TCHECK_LEN(p, withdrawn_routes_len);
3023 if (length < withdrawn_routes_len)
3024 goto trunc;
3025 p += withdrawn_routes_len;
3026 length -= withdrawn_routes_len;
3027 }
3028
3029 ND_TCHECK_2(p);
3030 if (length < 2)
3031 goto trunc;
3032 len = GET_BE_U_2(p);
3033 p += 2;
3034 length -= 2;
3035
3036 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
3037 /* No withdrawn routes, no path attributes, no NLRI */
3038 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
3039 return;
3040 }
3041
3042 if (len) {
3043 /* Make sure the path attributes don't go past the end of the packet */
3044 if (length < len)
3045 goto trunc;
3046 /* do something more useful!*/
3047 while (len) {
3048 uint8_t aflags, atype, alenlen;
3049 uint16_t alen;
3050
3051 ND_TCHECK_2(p);
3052 if (length < 2)
3053 goto trunc;
3054 if (len < 2) {
3055 ND_PRINT("\n\t [path attrs too short]");
3056 p += len;
3057 length -= len;
3058 break;
3059 }
3060 aflags = GET_U_1(p);
3061 atype = GET_U_1(p + 1);
3062 p += 2;
3063 len -= 2;
3064 length -= 2;
3065 alenlen = bgp_attr_lenlen(aflags, p);
3066 ND_TCHECK_LEN(p, alenlen);
3067 if (length < alenlen)
3068 goto trunc;
3069 if (len < alenlen) {
3070 ND_PRINT("\n\t [path attrs too short]");
3071 p += len;
3072 length -= len;
3073 break;
3074 }
3075 alen = bgp_attr_len(aflags, p);
3076 p += alenlen;
3077 len -= alenlen;
3078 length -= alenlen;
3079
3080 ND_PRINT("\n\t %s (%u), length: %u",
3081 tok2str(bgp_attr_values, "Unknown Attribute", atype),
3082 atype,
3083 alen);
3084
3085 if (aflags) {
3086 ND_PRINT(", Flags [%s",
3087 bittok2str_nosep(bgp_flags, "", aflags));
3088 if (aflags & 0xf)
3089 ND_PRINT("+%x", aflags & 0xf);
3090 ND_PRINT("]: ");
3091 }
3092 if (len < alen) {
3093 ND_PRINT(" [path attrs too short]");
3094 p += len;
3095 length -= len;
3096 break;
3097 }
3098 if (length < alen)
3099 goto trunc;
3100 if (!bgp_attr_print(ndo, atype, p, alen, 0))
3101 goto trunc;
3102 p += alen;
3103 len -= alen;
3104 length -= alen;
3105 }
3106 }
3107
3108 if (length) {
3109 add_path = check_add_path(ndo, p, length, 32);
3110 ND_PRINT("\n\t Updated routes:");
3111 while (length != 0) {
3112 if (add_path) {
3113 ND_TCHECK_4(p);
3114 if (length < 4)
3115 goto trunc;
3116 path_id = GET_BE_U_4(p);
3117 p += 4;
3118 length -= 4;
3119 }
3120 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
3121 if (i == -1) {
3122 ND_PRINT("\n\t (illegal prefix length)");
3123 break;
3124 } else if (i == -2)
3125 goto trunc; /* bytes left, but not enough */
3126 else {
3127 ND_PRINT("\n\t %s", buf);
3128 if (add_path) {
3129 ND_PRINT(" Path Id: %u", path_id);
3130 }
3131 p += i;
3132 length -= i;
3133 }
3134 }
3135 }
3136 return;
3137 trunc:
3138 nd_print_trunc(ndo);
3139 }
3140
3141 static void
3142 bgp_notification_print_code(netdissect_options *ndo,
3143 const u_char *dat, u_int length,
3144 uint8_t bgpn_major, uint8_t bgpn_minor)
3145 {
3146 ND_PRINT(", %s (%u)",
3147 tok2str(bgp_notify_major_values, "Unknown Error",
3148 bgpn_major),
3149 bgpn_major);
3150
3151 switch (bgpn_major) {
3152
3153 case BGP_NOTIFY_MAJOR_MSG:
3154 ND_PRINT(", subcode %s (%u)",
3155 tok2str(bgp_notify_minor_msg_values, "Unknown",
3156 bgpn_minor),
3157 bgpn_minor);
3158 break;
3159 case BGP_NOTIFY_MAJOR_OPEN:
3160 ND_PRINT(", subcode %s (%u)",
3161 tok2str(bgp_notify_minor_open_values, "Unknown",
3162 bgpn_minor),
3163 bgpn_minor);
3164 break;
3165 case BGP_NOTIFY_MAJOR_UPDATE:
3166 ND_PRINT(", subcode %s (%u)",
3167 tok2str(bgp_notify_minor_update_values, "Unknown",
3168 bgpn_minor),
3169 bgpn_minor);
3170 break;
3171 case BGP_NOTIFY_MAJOR_FSM:
3172 ND_PRINT(" subcode %s (%u)",
3173 tok2str(bgp_notify_minor_fsm_values, "Unknown",
3174 bgpn_minor),
3175 bgpn_minor);
3176 break;
3177 case BGP_NOTIFY_MAJOR_ROUTEREFRESH:
3178 ND_PRINT(" subcode %s (%u)",
3179 tok2str(bgp_notify_minor_routerefresh_values, "Unknown",
3180 bgpn_minor),
3181 bgpn_minor);
3182 break;
3183 case BGP_NOTIFY_MAJOR_CEASE:
3184 ND_PRINT(", subcode %s (%u)",
3185 tok2str(bgp_notify_minor_cease_values, "Unknown",
3186 bgpn_minor),
3187 bgpn_minor);
3188
3189 /* RFC 4486 mentions optionally 7 bytes
3190 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
3191 */
3192 if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= 7) {
3193 ND_PRINT(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
3194 tok2str(af_values, "Unknown", GET_BE_U_2(dat)),
3195 GET_BE_U_2(dat),
3196 tok2str(bgp_safi_values, "Unknown", GET_U_1((dat + 2))),
3197 GET_U_1((dat + 2)),
3198 GET_BE_U_4(dat + 3));
3199 }
3200 /*
3201 * RFC 9003 describes a method to send a communication
3202 * intended for human consumption regarding the Administrative Shutdown
3203 */
3204 if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
3205 bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
3206 length >= 1) {
3207 uint8_t shutdown_comm_length = GET_U_1(dat);
3208 uint8_t remainder_offset = 0;
3209 /* garbage, hexdump it all */
3210 if (shutdown_comm_length > length - 1) {
3211 ND_PRINT(", invalid Shutdown Communication length");
3212 } else if (shutdown_comm_length == 0) {
3213 ND_PRINT(", empty Shutdown Communication");
3214 remainder_offset += 1;
3215 }
3216 /* a proper shutdown communication */
3217 else {
3218 ND_PRINT(", Shutdown Communication (length: %u): \"", shutdown_comm_length);
3219 nd_printjn(ndo, dat+1, shutdown_comm_length);
3220 ND_PRINT("\"");
3221 remainder_offset += shutdown_comm_length + 1;
3222 }
3223 /* if there is trailing data, hexdump it */
3224 if(length - remainder_offset > 0) {
3225 ND_PRINT(", Data: (length: %u)", length - remainder_offset);
3226 hex_print(ndo, "\n\t\t", dat + remainder_offset, length - remainder_offset);
3227 }
3228 }
3229 /*
3230 * RFC8538 describes the Hard Reset cease subcode, which contains another
3231 * notification code and subcode.
3232 */
3233 if (bgpn_minor == BGP_NOTIFY_MINOR_CEASE_HARDRESET && length >= 2) {
3234 bgpn_major = GET_U_1(dat++);
3235 bgpn_minor = GET_U_1(dat++);
3236 length -= 2;
3237 bgp_notification_print_code(ndo, dat, length, bgpn_major, bgpn_minor);
3238 }
3239 break;
3240 default:
3241 if (bgpn_minor != 0) {
3242 ND_PRINT(", subcode %u", bgpn_minor);
3243 }
3244 break;
3245 }
3246
3247 return;
3248 }
3249
3250 static void
3251 bgp_notification_print(netdissect_options *ndo,
3252 const u_char *dat, u_int length)
3253 {
3254 const struct bgp_notification *bgp_notification_header;
3255 uint8_t bgpn_major, bgpn_minor;
3256
3257 ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
3258 if (length<BGP_NOTIFICATION_SIZE)
3259 return;
3260
3261 bgp_notification_header = (const struct bgp_notification *)dat;
3262 bgpn_major = GET_U_1(bgp_notification_header->bgpn_major);
3263 bgpn_minor = GET_U_1(bgp_notification_header->bgpn_minor);
3264 bgp_notification_print_code(ndo, dat + BGP_NOTIFICATION_SIZE,
3265 length - BGP_NOTIFICATION_SIZE, bgpn_major, bgpn_minor);
3266 return;
3267 trunc:
3268 nd_print_trunc(ndo);
3269 }
3270
3271 static void
3272 bgp_route_refresh_print(netdissect_options *ndo,
3273 const u_char *pptr, u_int len)
3274 {
3275 const struct bgp_route_refresh *bgp_route_refresh_header;
3276
3277 /* some little sanity checking */
3278 if (len<BGP_ROUTE_REFRESH_SIZE)
3279 return;
3280
3281 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
3282
3283 ND_PRINT("\n\t AFI %s (%u), SAFI %s (%u), Subtype %s (%u)",
3284 tok2str(af_values, "Unknown",
3285 GET_BE_U_2(bgp_route_refresh_header->afi)),
3286 GET_BE_U_2(bgp_route_refresh_header->afi),
3287 tok2str(bgp_safi_values, "Unknown",
3288 GET_U_1(bgp_route_refresh_header->safi)),
3289 GET_U_1(bgp_route_refresh_header->safi),
3290 tok2str(bgp_route_refresh_subtype_values, "Unknown",
3291 GET_U_1(bgp_route_refresh_header->subtype)),
3292 GET_U_1(bgp_route_refresh_header->subtype));
3293
3294 /* ORF */
3295 if (len >= BGP_ROUTE_REFRESH_SIZE_ORF) {
3296 const struct bgp_route_refresh_orf *orf_header;
3297
3298 orf_header =
3299 (const struct bgp_route_refresh_orf *)(pptr + BGP_ROUTE_REFRESH_SIZE);
3300
3301 ND_PRINT("\n\t ORF refresh %s (%u), ORF type %s (%u), ORF length %u",
3302 tok2str(bgp_orf_refresh_type, "Unknown",
3303 GET_U_1(orf_header->refresh)),
3304 GET_U_1(orf_header->refresh),
3305 tok2str(bgp_orf_type, "Unknown", GET_U_1(orf_header->type)),
3306 GET_U_1(orf_header->type), GET_BE_U_2(orf_header->len));
3307 }
3308
3309 if (ndo->ndo_vflag > 1) {
3310 ND_TCHECK_LEN(pptr, len);
3311 print_unknown_data(ndo, pptr, "\n\t ", len);
3312 }
3313
3314 return;
3315 trunc:
3316 nd_print_trunc(ndo);
3317 }
3318
3319 static int
3320 bgp_pdu_print(netdissect_options *ndo,
3321 const u_char *dat, u_int length)
3322 {
3323 const struct bgp *bgp_header;
3324 uint8_t bgp_type;
3325
3326 ND_TCHECK_LEN(dat, BGP_SIZE);
3327 bgp_header = (const struct bgp *)dat;
3328 bgp_type = GET_U_1(bgp_header->bgp_type);
3329
3330 ND_PRINT("\n\t%s Message (%u), length: %u",
3331 tok2str(bgp_msg_values, "Unknown", bgp_type),
3332 bgp_type,
3333 length);
3334
3335 switch (bgp_type) {
3336 case BGP_OPEN:
3337 bgp_open_print(ndo, dat, length);
3338 break;
3339 case BGP_UPDATE:
3340 bgp_update_print(ndo, dat, length);
3341 break;
3342 case BGP_NOTIFICATION:
3343 bgp_notification_print(ndo, dat, length);
3344 break;
3345 case BGP_KEEPALIVE:
3346 break;
3347 case BGP_ROUTE_REFRESH:
3348 bgp_route_refresh_print(ndo, dat, length);
3349 break;
3350 default:
3351 /* we have no decoder for the BGP message */
3352 ND_TCHECK_LEN(dat, length);
3353 ND_PRINT("\n\t no Message %u decoder", bgp_type);
3354 print_unknown_data(ndo, dat, "\n\t ", length);
3355 break;
3356 }
3357 return 1;
3358 trunc:
3359 nd_print_trunc(ndo);
3360 return 0;
3361 }
3362
3363 void
3364 bgp_print(netdissect_options *ndo,
3365 const u_char *dat, u_int length _U_)
3366 {
3367 const u_char *p;
3368 const u_char *ep = ndo->ndo_snapend;
3369 const u_char *start;
3370 const u_char marker[] = {
3371 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3372 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3373 };
3374 const struct bgp *bgp_header;
3375 uint16_t hlen;
3376
3377 ndo->ndo_protocol = "bgp";
3378 ND_PRINT(": BGP");
3379
3380 if (ndo->ndo_vflag < 1) /* lets be less chatty */
3381 return;
3382
3383 p = dat;
3384 start = p;
3385 while (p < ep) {
3386 if (!ND_TTEST_1(p))
3387 break;
3388 if (GET_U_1(p) != 0xff) {
3389 p++;
3390 continue;
3391 }
3392
3393 if (!ND_TTEST_LEN(p, sizeof(marker)))
3394 break;
3395 if (memcmp(p, marker, sizeof(marker)) != 0) {
3396 p++;
3397 continue;
3398 }
3399
3400 /* found BGP header */
3401 ND_TCHECK_LEN(p, BGP_SIZE);
3402 bgp_header = (const struct bgp *)p;
3403
3404 if (start != p)
3405 nd_print_trunc(ndo);
3406
3407 hlen = GET_BE_U_2(bgp_header->bgp_len);
3408 if (hlen < BGP_SIZE) {
3409 ND_PRINT("\nmessage length %u < %u", hlen, BGP_SIZE);
3410 nd_print_invalid(ndo);
3411 break;
3412 }
3413
3414 if (ND_TTEST_LEN(p, hlen)) {
3415 if (!bgp_pdu_print(ndo, p, hlen))
3416 return;
3417 p += hlen;
3418 start = p;
3419 } else {
3420 ND_PRINT("\n[|BGP %s]",
3421 tok2str(bgp_msg_values,
3422 "Unknown Message Type",
3423 GET_U_1(bgp_header->bgp_type)));
3424 break;
3425 }
3426 }
3427
3428 return;
3429
3430 trunc:
3431 nd_print_trunc(ndo);
3432 }
[mirror] the TCPdump network dissector