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