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Fix compiling on GNU/Hurd. [skip appveyor]
[tcpdump] / print-bgp.c
1 /*
2 * Copyright (C) 1999 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * Extensively modified by Hannes Gredler (hannes@gredler.at) for more
30 * complete BGP support.
31 */
32
33 /* \summary: Border Gateway Protocol (BGP) printer */
34
35 /* specification: RFC 4271 */
36
37 #ifdef HAVE_CONFIG_H
38 #include <config.h>
39 #endif
40
41 #include "netdissect-stdinc.h"
42
43 #include <stdio.h>
44 #include <string.h>
45
46 #include "netdissect.h"
47 #include "addrtoname.h"
48 #include "extract.h"
49 #include "af.h"
50 #include "l2vpn.h"
51
52 struct bgp {
53 nd_byte bgp_marker[16];
54 nd_uint16_t bgp_len;
55 nd_uint8_t bgp_type;
56 };
57 #define BGP_SIZE 19 /* unaligned */
58
59 #define BGP_OPEN 1
60 #define BGP_UPDATE 2
61 #define BGP_NOTIFICATION 3
62 #define BGP_KEEPALIVE 4
63 #define BGP_ROUTE_REFRESH 5
64
65 static const struct tok bgp_msg_values[] = {
66 { BGP_OPEN, "Open"},
67 { BGP_UPDATE, "Update"},
68 { BGP_NOTIFICATION, "Notification"},
69 { BGP_KEEPALIVE, "Keepalive"},
70 { BGP_ROUTE_REFRESH, "Route Refresh"},
71 { 0, NULL}
72 };
73
74 struct bgp_open {
75 nd_byte bgpo_marker[16];
76 nd_uint16_t bgpo_len;
77 nd_uint8_t bgpo_type;
78 nd_uint8_t bgpo_version;
79 nd_uint16_t bgpo_myas;
80 nd_uint16_t bgpo_holdtime;
81 nd_uint32_t bgpo_id;
82 nd_uint8_t bgpo_optlen;
83 nd_uint8_t bgpo_opttype; /* RFC9072 */
84 nd_uint16_t bgpo_optlen_extended; /* RFC9072 */
85 /* options should follow */
86 };
87 #define BGP_OPEN_SIZE 29 /* unaligned */
88
89 struct bgp_opt {
90 nd_uint8_t bgpopt_type;
91 nd_uint16_t bgpopt_len; /* Can be one or two bytes, depending on RFC9072 */
92 /* variable length */
93 };
94 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
95 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
96
97 struct bgp_notification {
98 nd_byte bgpn_marker[16];
99 nd_uint16_t bgpn_len;
100 nd_uint8_t bgpn_type;
101 nd_uint8_t bgpn_major;
102 nd_uint8_t bgpn_minor;
103 };
104 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
105
106 struct bgp_route_refresh_orf {
107 nd_uint8_t refresh;
108 nd_uint8_t type;
109 nd_uint16_t len;
110 };
111
112 struct bgp_route_refresh {
113 nd_byte bgp_marker[16];
114 nd_uint16_t len;
115 nd_uint8_t type; /* No padding after this; afi is, in fact, not aligned */
116 nd_uint16_t afi;
117 nd_uint8_t subtype;
118 nd_uint8_t safi;
119 };
120
121 static const struct tok bgp_orf_refresh_type[] = {
122 { 1, "Immediate"},
123 { 2, "Defer"},
124 { 0, NULL }
125 };
126
127 static const struct tok bgp_orf_type[] = {
128 { 64, "Address Prefix ORF"},
129 { 65, "CP-ORF"},
130 { 0, NULL }
131 };
132
133 #define BGP_ROUTE_REFRESH_SIZE 23
134 #define BGP_ROUTE_REFRESH_SIZE_ORF BGP_ROUTE_REFRESH_SIZE + 5
135 #define BGP_ROUTE_REFRESH_SUBTYPE_NORMAL 0
136 #define BGP_ROUTE_REFRESH_SUBTYPE_BORR 1
137 #define BGP_ROUTE_REFRESH_SUBTYPE_EORR 2
138 #define BGP_ROUTE_REFRESH_SUBTYPE_RESERVED 255
139
140 static const struct tok bgp_route_refresh_subtype_values[] = {
141 {BGP_ROUTE_REFRESH_SUBTYPE_NORMAL, "Normal route refresh request"},
142 {BGP_ROUTE_REFRESH_SUBTYPE_BORR,
143 "Demarcation of the beginning of a route refresh"},
144 {BGP_ROUTE_REFRESH_SUBTYPE_EORR,
145 "Demarcation of the ending of a route refresh"},
146 {0, NULL}};
147
148 #define bgp_attr_lenlen(flags, p) \
149 (((flags) & 0x10) ? 2U : 1U)
150 #define bgp_attr_len(flags, p) \
151 (((flags) & 0x10) ? GET_BE_U_2(p) : GET_U_1(p))
152
153 #define BGPTYPE_ORIGIN 1
154 #define BGPTYPE_AS_PATH 2
155 #define BGPTYPE_NEXT_HOP 3
156 #define BGPTYPE_MULTI_EXIT_DISC 4
157 #define BGPTYPE_LOCAL_PREF 5
158 #define BGPTYPE_ATOMIC_AGGREGATE 6
159 #define BGPTYPE_AGGREGATOR 7
160 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
161 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */
162 #define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */
163 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */
164 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */
165 #define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */
166 #define BGPTYPE_AS4_PATH 17 /* RFC6793 */
167 #define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */
168 #define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */
169 #define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */
170 #define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */
171 #define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */
172 #define BGPTYPE_AIGP 26 /* RFC7311 */
173 #define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */
174 #define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */
175 #define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */
176 #define BGPTYPE_BGPSEC_PATH 33 /* RFC8205 */
177 #define BGPTYPE_OTC 35 /* RFC9234 */
178 #define BGPTYPE_ATTR_SET 128 /* RFC6368 */
179
180 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
181
182 static const struct tok bgp_attr_values[] = {
183 { BGPTYPE_ORIGIN, "Origin"},
184 { BGPTYPE_AS_PATH, "AS Path"},
185 { BGPTYPE_AS4_PATH, "AS4 Path"},
186 { BGPTYPE_NEXT_HOP, "Next Hop"},
187 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
188 { BGPTYPE_LOCAL_PREF, "Local Preference"},
189 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
190 { BGPTYPE_AGGREGATOR, "Aggregator"},
191 { BGPTYPE_AGGREGATOR4, "Aggregator4"},
192 { BGPTYPE_COMMUNITIES, "Community"},
193 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
194 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
195 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
196 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
197 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
198 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
199 { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"},
200 { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"},
201 { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
202 { BGPTYPE_AIGP, "Accumulated IGP Metric"},
203 { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
204 { BGPTYPE_ENTROPY_LABEL, "Entropy Label"},
205 { BGPTYPE_LARGE_COMMUNITY, "Large Community"},
206 { BGPTYPE_BGPSEC_PATH, "BGPsec Path"},
207 { BGPTYPE_OTC, "Only to Customer (OTC)"},
208 { BGPTYPE_ATTR_SET, "Attribute Set"},
209 { 255, "Reserved for development"},
210 { 0, NULL}
211 };
212
213 #define BGP_AS_SET 1
214 #define BGP_AS_SEQUENCE 2
215 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
216 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
217
218 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
219 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
220
221 static const struct tok bgp_as_path_segment_open_values[] = {
222 { BGP_AS_SEQUENCE, ""},
223 { BGP_AS_SET, "{ "},
224 { BGP_CONFED_AS_SEQUENCE, "( "},
225 { BGP_CONFED_AS_SET, "({ "},
226 { 0, NULL}
227 };
228
229 static const struct tok bgp_as_path_segment_close_values[] = {
230 { BGP_AS_SEQUENCE, ""},
231 { BGP_AS_SET, "}"},
232 { BGP_CONFED_AS_SEQUENCE, ")"},
233 { BGP_CONFED_AS_SET, "})"},
234 { 0, NULL}
235 };
236
237 #define BGP_OPT_AUTH 1
238 #define BGP_OPT_CAP 2
239
240 static const struct tok bgp_opt_values[] = {
241 { BGP_OPT_AUTH, "Authentication Information"},
242 { BGP_OPT_CAP, "Capabilities Advertisement"},
243 { 0, NULL}
244 };
245
246 #define BGP_CAPCODE_MP 1 /* RFC2858 */
247 #define BGP_CAPCODE_RR 2 /* RFC2918 */
248 #define BGP_CAPCODE_ORF 3 /* RFC5291 */
249 #define BGP_CAPCODE_MR 4 /* RFC3107 */
250 #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */
251 #define BGP_CAPCODE_EXT_MSG 6 /* RFC8654 */
252 #define BGP_CAPCODE_BGPSEC 7 /* RFC8205 */
253 #define BGP_CAPCODE_ML 8 /* RFC8277 */
254 #define BGP_CAPCODE_ROLE 9 /* RFC9234 */
255 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */
256 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
257 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
258 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
259 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
260 #define BGP_CAPCODE_ENH_RR 70 /* RFC7313 */
261 #define BGP_CAPCODE_LLGR 71 /* draft-uttaro-idr-bgp-persistence-05 */
262 #define BGP_CAPCODE_RR_CISCO 128
263
264 static const struct tok bgp_capcode_values[] = {
265 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
266 { BGP_CAPCODE_RR, "Route Refresh"},
267 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
268 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
269 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
270 { BGP_CAPCODE_EXT_MSG, "BGP Extended Message"},
271 { BGP_CAPCODE_BGPSEC, "BGPsec"},
272 { BGP_CAPCODE_ML, "Multiple Labels"},
273 { BGP_CAPCODE_RESTART, "Graceful Restart"},
274 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
275 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
276 { BGP_CAPCODE_MULTISESS, "Multisession BGP"},
277 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
278 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
279 { BGP_CAPCODE_LLGR, "Long-lived Graceful Restart"},
280 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
281 { BGP_CAPCODE_ROLE, "Role Capability"},
282 { 0, NULL}
283 };
284
285 #define BGP_NOTIFY_MAJOR_MSG 1
286 #define BGP_NOTIFY_MAJOR_OPEN 2
287 #define BGP_NOTIFY_MAJOR_UPDATE 3
288 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
289 #define BGP_NOTIFY_MAJOR_FSM 5
290 #define BGP_NOTIFY_MAJOR_CEASE 6
291 #define BGP_NOTIFY_MAJOR_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 if (route_length < BGP_VPN_RD_LEN)
1272 goto trunc;
1273 offset = (u_int)strlen(buf);
1274 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
1275 bgp_vpn_rd_print(ndo, pptr),
1276 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
1277 (route_length - BGP_VPN_RD_LEN) << 3));
1278 break;
1279 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
1280 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1281 offset = (u_int)strlen(buf);
1282 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
1283 bgp_vpn_rd_print(ndo, pptr),
1284 as_printf(ndo, astostr, sizeof(astostr),
1285 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1286 break;
1287
1288 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
1289 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1290 offset = (u_int)strlen(buf);
1291 snprintf(buf + offset, buflen - offset, ", RD: %s",
1292 bgp_vpn_rd_print(ndo, pptr));
1293 pptr += BGP_VPN_RD_LEN;
1294
1295 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1296 addr_length = route_length - sg_length;
1297
1298 ND_TCHECK_LEN(pptr, addr_length);
1299 offset = (u_int)strlen(buf);
1300 snprintf(buf + offset, buflen - offset, ", Originator %s",
1301 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
1302 break;
1303
1304 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
1305 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1306 offset = (u_int)strlen(buf);
1307 snprintf(buf + offset, buflen - offset, ", RD: %s",
1308 bgp_vpn_rd_print(ndo, pptr));
1309 pptr += BGP_VPN_RD_LEN;
1310
1311 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1312 break;
1313
1314 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
1315 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
1316 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1317 offset = (u_int)strlen(buf);
1318 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
1319 bgp_vpn_rd_print(ndo, pptr),
1320 as_printf(ndo, astostr, sizeof(astostr),
1321 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1322 pptr += BGP_VPN_RD_LEN + 4;
1323
1324 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1325 break;
1326
1327 /*
1328 * no per route-type printing yet.
1329 */
1330 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
1331 default:
1332 break;
1333 }
1334
1335 return route_length + 2;
1336
1337 trunc:
1338 return -2;
1339 }
1340
1341 /*
1342 * As I remember, some versions of systems have an snprintf() that
1343 * returns -1 if the buffer would have overflowed. If the return
1344 * value is negative, set buflen to 0, to indicate that we've filled
1345 * the buffer up.
1346 *
1347 * If the return value is greater than buflen, that means that
1348 * the buffer would have overflowed; again, set buflen to 0 in
1349 * that case.
1350 */
1351 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1352 if (stringlen<0) \
1353 buflen=0; \
1354 else if ((u_int)stringlen>buflen) \
1355 buflen=0; \
1356 else { \
1357 buflen-=stringlen; \
1358 buf+=stringlen; \
1359 }
1360
1361 static int
1362 decode_labeled_vpn_l2(netdissect_options *ndo,
1363 const u_char *pptr, char *buf, size_t buflen)
1364 {
1365 u_int plen, tlen, tlv_type, tlv_len, ttlv_len;
1366 int stringlen;
1367
1368 plen = GET_BE_U_2(pptr);
1369 tlen = plen;
1370 pptr += 2;
1371 /* Old and new L2VPN NLRI share AFI/SAFI
1372 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1373 * and > 17 as old format. Complain for the middle case
1374 */
1375 if (plen == 12) {
1376 /* assume AD-only with RD, BGPNH */
1377 ND_TCHECK_LEN(pptr, 12);
1378 buf[0] = '\0';
1379 stringlen = snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1380 bgp_vpn_rd_print(ndo, pptr),
1381 GET_IPADDR_STRING(pptr+8));
1382 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1383 pptr += 12;
1384 tlen -= 12;
1385 return plen + 2;
1386 } else if (plen > 17) {
1387 /* assume old format */
1388 /* RD, ID, LBLKOFF, LBLBASE */
1389
1390 ND_TCHECK_LEN(pptr, 15);
1391 buf[0] = '\0';
1392 stringlen = snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1393 bgp_vpn_rd_print(ndo, pptr),
1394 GET_BE_U_2(pptr + 8),
1395 GET_BE_U_2(pptr + 10),
1396 GET_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1397 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1398 pptr += 15;
1399 tlen -= 15;
1400
1401 /* ok now the variable part - lets read out TLVs*/
1402 while (tlen != 0) {
1403 if (tlen < 3) {
1404 if (buflen != 0) {
1405 stringlen=snprintf(buf,buflen, "\n\t\tran past the end");
1406 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1407 }
1408 return plen + 2;
1409 }
1410 tlv_type = GET_U_1(pptr);
1411 pptr++;
1412 tlv_len = GET_BE_U_2(pptr); /* length, in *bits* */
1413 ttlv_len = (tlv_len + 7)/8; /* length, in *bytes* */
1414 pptr += 2;
1415
1416 switch(tlv_type) {
1417 case 1:
1418 if (buflen != 0) {
1419 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1420 tlv_type,
1421 tlv_len);
1422 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1423 }
1424 while (ttlv_len != 0) {
1425 if (tlen < 1) {
1426 if (buflen != 0) {
1427 stringlen=snprintf(buf,buflen, " (ran past the end)");
1428 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1429 }
1430 return plen + 2;
1431 }
1432 ND_TCHECK_1(pptr);
1433 if (buflen != 0) {
1434 stringlen=snprintf(buf,buflen, "%02x",
1435 GET_U_1(pptr));
1436 pptr++;
1437 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1438 }
1439 ttlv_len--;
1440 tlen--;
1441 }
1442 break;
1443 default:
1444 if (buflen != 0) {
1445 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1446 tlv_type,
1447 tlv_len);
1448 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1449 }
1450 if (tlen < ttlv_len) {
1451 if (buflen != 0) {
1452 stringlen=snprintf(buf,buflen, " (ran past the end)");
1453 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1454 }
1455 return plen + 2;
1456 }
1457 tlen -= ttlv_len;
1458 break;
1459 }
1460 }
1461 return plen + 2;
1462 } else {
1463 /* complain bitterly ? */
1464 /* fall through */
1465 goto trunc;
1466 }
1467
1468 trunc:
1469 return -2;
1470 }
1471
1472 int
1473 decode_prefix6(netdissect_options *ndo,
1474 const u_char *pd, u_int itemlen, char *buf, size_t buflen)
1475 {
1476 nd_ipv6 addr;
1477 u_int plen, plenbytes;
1478
1479 ITEMCHECK(1);
1480 plen = GET_U_1(pd);
1481 if (128 < plen)
1482 return -1;
1483 itemlen -= 1;
1484
1485 memset(&addr, 0, sizeof(addr));
1486 plenbytes = (plen + 7) / 8;
1487 ITEMCHECK(plenbytes);
1488 GET_CPY_BYTES(&addr, pd + 1, plenbytes);
1489 if (plen % 8) {
1490 addr[plenbytes - 1] &=
1491 ((0xff00 >> (plen % 8)) & 0xff);
1492 }
1493 snprintf(buf, buflen, "%s/%u", ip6addr_string(ndo, (const u_char *)&addr), plen);
1494 return 1 + plenbytes;
1495
1496 badtlv:
1497 return -2;
1498 }
1499
1500 static int
1501 decode_labeled_prefix6(netdissect_options *ndo,
1502 const u_char *pptr, u_int itemlen, char *buf, size_t buflen)
1503 {
1504 nd_ipv6 addr;
1505 u_int plen, plenbytes;
1506
1507 /* prefix length and label = 4 bytes */
1508 ND_TCHECK_4(pptr);
1509 ITEMCHECK(4);
1510 plen = GET_U_1(pptr); /* get prefix length */
1511
1512 if (24 > plen)
1513 return -1;
1514
1515 plen -= 24; /* adjust prefixlen - labellength */
1516
1517 if (128 < plen)
1518 return -1;
1519 itemlen -= 4;
1520
1521 memset(&addr, 0, sizeof(addr));
1522 plenbytes = (plen + 7) / 8;
1523 GET_CPY_BYTES(&addr, pptr + 4, plenbytes);
1524 if (plen % 8) {
1525 addr[plenbytes - 1] &=
1526 ((0xff00 >> (plen % 8)) & 0xff);
1527 }
1528 /* the label may get offsetted by 4 bits so lets shift it right */
1529 snprintf(buf, buflen, "%s/%u, label:%u %s",
1530 ip6addr_string(ndo, (const u_char *)&addr),
1531 plen,
1532 GET_BE_U_3(pptr + 1)>>4,
1533 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1534
1535 return 4 + plenbytes;
1536
1537 trunc:
1538 return -2;
1539
1540 badtlv:
1541 return -3;
1542 }
1543
1544 static int
1545 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1546 const u_char *pptr, char *buf, size_t buflen)
1547 {
1548 nd_ipv6 addr;
1549 u_int plen;
1550
1551 plen = GET_U_1(pptr); /* get prefix length */
1552
1553 if ((24+64) > plen)
1554 return -1;
1555
1556 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1557
1558 if (128 < plen)
1559 return -1;
1560
1561 memset(&addr, 0, sizeof(addr));
1562 GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
1563 if (plen % 8) {
1564 addr[(plen + 7) / 8 - 1] &=
1565 ((0xff00 >> (plen % 8)) & 0xff);
1566 }
1567 /* the label may get offsetted by 4 bits so lets shift it right */
1568 snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1569 bgp_vpn_rd_print(ndo, pptr+4),
1570 ip6addr_string(ndo, (const u_char *)&addr),
1571 plen,
1572 GET_BE_U_3(pptr + 1)>>4,
1573 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1574
1575 return 12 + (plen + 7) / 8;
1576 }
1577
1578 static int
1579 decode_clnp_prefix(netdissect_options *ndo,
1580 const u_char *pptr, char *buf, size_t buflen)
1581 {
1582 uint8_t addr[19];
1583 u_int plen;
1584
1585 plen = GET_U_1(pptr); /* get prefix length */
1586
1587 if (152 < plen)
1588 return -1;
1589
1590 memset(&addr, 0, sizeof(addr));
1591 GET_CPY_BYTES(&addr, pptr + 4, (plen + 7) / 8);
1592 if (plen % 8) {
1593 addr[(plen + 7) / 8 - 1] &=
1594 ((0xff00 >> (plen % 8)) & 0xff);
1595 }
1596 /* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */
1597 snprintf(buf, buflen, "%s/%u",
1598 isonsap_string(ndo, addr,(plen + 7) / 8),
1599 plen);
1600
1601 return 1 + (plen + 7) / 8;
1602 }
1603
1604 static int
1605 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1606 const u_char *pptr, char *buf, size_t buflen)
1607 {
1608 uint8_t addr[19];
1609 u_int plen;
1610
1611 plen = GET_U_1(pptr); /* get prefix length */
1612
1613 if ((24+64) > plen)
1614 return -1;
1615
1616 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1617
1618 if (152 < plen)
1619 return -1;
1620
1621 memset(&addr, 0, sizeof(addr));
1622 GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
1623 if (plen % 8) {
1624 addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
1625 }
1626 /* the label may get offsetted by 4 bits so lets shift it right */
1627 /* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */
1628 snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1629 bgp_vpn_rd_print(ndo, pptr+4),
1630 isonsap_string(ndo, addr,(plen + 7) / 8),
1631 plen,
1632 GET_BE_U_3(pptr + 1)>>4,
1633 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1634
1635 return 12 + (plen + 7) / 8;
1636 }
1637
1638 /*
1639 * bgp_attr_get_as_size
1640 *
1641 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1642 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1643 * support, exchange AS-Path with the same path-attribute type value 0x02.
1644 */
1645 static u_int
1646 bgp_attr_get_as_size(netdissect_options *ndo,
1647 uint8_t bgpa_type, const u_char *pptr, u_int len)
1648 {
1649 const u_char *tptr = pptr;
1650
1651 /*
1652 * If the path attribute is the optional AS4 path type, then we already
1653 * know, that ASs must be encoded in 4 byte format.
1654 */
1655 if (bgpa_type == BGPTYPE_AS4_PATH) {
1656 return 4;
1657 }
1658
1659 /*
1660 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1661 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1662 * each.
1663 */
1664 while (tptr < pptr + len) {
1665 /*
1666 * If we do not find a valid segment type, our guess might be wrong.
1667 */
1668 if (GET_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || GET_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
1669 goto trunc;
1670 }
1671 tptr += 2 + GET_U_1(tptr + 1) * 2;
1672 }
1673
1674 /*
1675 * If we correctly reached end of the AS path attribute data content,
1676 * then most likely ASs were indeed encoded as 2 bytes.
1677 */
1678 if (tptr == pptr + len) {
1679 return 2;
1680 }
1681
1682 trunc:
1683
1684 /*
1685 * We can come here, either we did not have enough data, or if we
1686 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1687 * so that caller can try to decode each AS as of 4 bytes. If indeed
1688 * there was not enough data, it will crib and end the parse anyways.
1689 */
1690 return 4;
1691 }
1692
1693 /*
1694 * The only way to know that a BGP UPDATE message is using add path is
1695 * by checking if the capability is in the OPEN message which we may have missed.
1696 * So this function checks if it is possible that the update could contain add path
1697 * and if so it checks that standard BGP doesn't make sense.
1698 */
1699 static int
1700 check_add_path(netdissect_options *ndo, const u_char *pptr, u_int length,
1701 u_int max_prefix_length)
1702 {
1703 u_int offset, prefix_length;
1704
1705 if (length < 5) {
1706 return 0;
1707 }
1708
1709 /*
1710 * Scan through the NLRI information under the assumption that
1711 * it doesn't have path IDs.
1712 */
1713 for (offset = 0; offset < length;) {
1714 offset += 4;
1715 if (!ND_TTEST_1(pptr + offset)) {
1716 /* We ran out of captured data; quit scanning. */
1717 break;
1718 }
1719 prefix_length = GET_U_1(pptr + offset);
1720 /*
1721 * Add 4 to cover the path id
1722 * and check the prefix length isn't greater than 32/128.
1723 */
1724 if (prefix_length > max_prefix_length) {
1725 return 0;
1726 }
1727 /* Add 1 for the prefix_length byte and prefix_length to cover the address */
1728 offset += 1 + ((prefix_length + 7) / 8);
1729 }
1730 /* check we haven't gone past the end of the section */
1731 if (offset > length) {
1732 return 0;
1733 }
1734
1735 /* check it's not standard BGP */
1736 for (offset = 0; offset < length; ) {
1737 if (!ND_TTEST_1(pptr + offset)) {
1738 /* We ran out of captured data; quit scanning. */
1739 break;
1740 }
1741 prefix_length = GET_U_1(pptr + offset);
1742 /*
1743 * If the prefix_length is zero (0.0.0.0/0)
1744 * and since it's not the only address (length >= 5)
1745 * then it is add-path
1746 */
1747 if (prefix_length < 1 || prefix_length > max_prefix_length) {
1748 return 1;
1749 }
1750 offset += 1 + ((prefix_length + 7) / 8);
1751 }
1752 if (offset > length) {
1753 return 1;
1754 }
1755
1756 /* assume not add-path by default */
1757 return 0;
1758 }
1759
1760 static int
1761 bgp_mp_af_print(netdissect_options *ndo,
1762 const u_char *tptr, u_int tlen,
1763 uint16_t *afp, uint8_t *safip)
1764 {
1765 uint16_t af;
1766 uint8_t safi;
1767
1768 af = GET_BE_U_2(tptr);
1769 *afp = af;
1770 safi = GET_U_1(tptr + 2);
1771 *safip = safi;
1772
1773 ND_PRINT("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1774 tok2str(af_values, "Unknown AFI", af),
1775 af,
1776 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1777 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1778 safi);
1779
1780 switch(af<<8 | safi) {
1781 case (AFNUM_IP<<8 | SAFNUM_UNICAST):
1782 case (AFNUM_IP<<8 | SAFNUM_MULTICAST):
1783 case (AFNUM_IP<<8 | SAFNUM_UNIMULTICAST):
1784 case (AFNUM_IP<<8 | SAFNUM_LABUNICAST):
1785 case (AFNUM_IP<<8 | SAFNUM_RT_ROUTING_INFO):
1786 case (AFNUM_IP<<8 | SAFNUM_VPNUNICAST):
1787 case (AFNUM_IP<<8 | SAFNUM_VPNMULTICAST):
1788 case (AFNUM_IP<<8 | SAFNUM_VPNUNIMULTICAST):
1789 case (AFNUM_IP<<8 | SAFNUM_MULTICAST_VPN):
1790 case (AFNUM_IP<<8 | SAFNUM_MDT):
1791 case (AFNUM_IP6<<8 | SAFNUM_UNICAST):
1792 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST):
1793 case (AFNUM_IP6<<8 | SAFNUM_UNIMULTICAST):
1794 case (AFNUM_IP6<<8 | SAFNUM_LABUNICAST):
1795 case (AFNUM_IP6<<8 | SAFNUM_VPNUNICAST):
1796 case (AFNUM_IP6<<8 | SAFNUM_VPNMULTICAST):
1797 case (AFNUM_IP6<<8 | SAFNUM_VPNUNIMULTICAST):
1798 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1799 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1800 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1801 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1802 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1803 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1804 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1805 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1806 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1807 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1808 break;
1809 default:
1810 ND_TCHECK_LEN(tptr, tlen);
1811 ND_PRINT("\n\t no AFI %u / SAFI %u decoder", af, safi);
1812 if (ndo->ndo_vflag <= 1)
1813 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1814 return -1;
1815 }
1816 return 0;
1817 trunc:
1818 return -2;
1819 }
1820
1821 static int
1822 bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi,
1823 const u_char *tptr, u_int len,
1824 char *buf, size_t buflen,
1825 int add_path4, int add_path6)
1826 {
1827 int advance;
1828 u_int path_id = 0;
1829
1830 switch (af<<8 | safi) {
1831 case (AFNUM_IP<<8 | SAFNUM_UNICAST):
1832 case (AFNUM_IP<<8 | SAFNUM_MULTICAST):
1833 case (AFNUM_IP<<8 | SAFNUM_UNIMULTICAST):
1834 if (add_path4) {
1835 path_id = GET_BE_U_4(tptr);
1836 tptr += 4;
1837 }
1838 advance = decode_prefix4(ndo, tptr, len, buf, buflen);
1839 if (advance == -1)
1840 ND_PRINT("\n\t (illegal prefix length)");
1841 else if (advance == -2)
1842 break; /* bytes left, but not enough */
1843 else
1844 ND_PRINT("\n\t %s", buf);
1845 if (add_path4) {
1846 ND_PRINT(" Path Id: %u", path_id);
1847 advance += 4;
1848 }
1849 break;
1850 case (AFNUM_IP<<8 | SAFNUM_LABUNICAST):
1851 advance = decode_labeled_prefix4(ndo, tptr, len, buf, buflen);
1852 if (advance == -1)
1853 ND_PRINT("\n\t (illegal prefix length)");
1854 else if (advance == -2)
1855 goto trunc;
1856 else if (advance == -3)
1857 break; /* bytes left, but not enough */
1858 else
1859 ND_PRINT("\n\t %s", buf);
1860 break;
1861 case (AFNUM_IP<<8 | SAFNUM_VPNUNICAST):
1862 case (AFNUM_IP<<8 | SAFNUM_VPNMULTICAST):
1863 case (AFNUM_IP<<8 | SAFNUM_VPNUNIMULTICAST):
1864 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, buflen);
1865 if (advance == -1)
1866 ND_PRINT("\n\t (illegal prefix length)");
1867 else
1868 ND_PRINT("\n\t %s", buf);
1869 break;
1870 case (AFNUM_IP<<8 | SAFNUM_RT_ROUTING_INFO):
1871 advance = decode_rt_routing_info(ndo, tptr);
1872 break;
1873 case (AFNUM_IP<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1874 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST_VPN):
1875 advance = decode_multicast_vpn(ndo, tptr, buf, buflen);
1876 if (advance == -1)
1877 ND_PRINT("\n\t (illegal prefix length)");
1878 else if (advance == -2)
1879 goto trunc;
1880 else
1881 ND_PRINT("\n\t %s", buf);
1882 break;
1883
1884 case (AFNUM_IP<<8 | SAFNUM_MDT):
1885 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, buflen);
1886 if (advance == -1)
1887 ND_PRINT("\n\t (illegal prefix length)");
1888 else if (advance == -2)
1889 goto trunc;
1890 else
1891 ND_PRINT("\n\t %s", buf);
1892 break;
1893 case (AFNUM_IP6<<8 | SAFNUM_UNICAST):
1894 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST):
1895 case (AFNUM_IP6<<8 | SAFNUM_UNIMULTICAST):
1896 if (add_path6) {
1897 path_id = GET_BE_U_4(tptr);
1898 tptr += 4;
1899 }
1900 advance = decode_prefix6(ndo, tptr, len, buf, buflen);
1901 if (advance == -1)
1902 ND_PRINT("\n\t (illegal prefix length)");
1903 else if (advance == -2)
1904 break; /* bytes left, but not enough */
1905 else
1906 ND_PRINT("\n\t %s", buf);
1907 if (add_path6) {
1908 ND_PRINT(" Path Id: %u", path_id);
1909 advance += 4;
1910 }
1911 break;
1912 case (AFNUM_IP6<<8 | SAFNUM_LABUNICAST):
1913 advance = decode_labeled_prefix6(ndo, tptr, len, buf, buflen);
1914 if (advance == -1)
1915 ND_PRINT("\n\t (illegal prefix length)");
1916 else if (advance == -2)
1917 goto trunc;
1918 else if (advance == -3)
1919 break; /* bytes left, but not enough */
1920 else
1921 ND_PRINT("\n\t %s", buf);
1922 break;
1923 case (AFNUM_IP6<<8 | SAFNUM_VPNUNICAST):
1924 case (AFNUM_IP6<<8 | SAFNUM_VPNMULTICAST):
1925 case (AFNUM_IP6<<8 | SAFNUM_VPNUNIMULTICAST):
1926 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, buflen);
1927 if (advance == -1)
1928 ND_PRINT("\n\t (illegal prefix length)");
1929 else
1930 ND_PRINT("\n\t %s", buf);
1931 break;
1932 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1933 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1934 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1935 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1936 advance = decode_labeled_vpn_l2(ndo, tptr, buf, buflen);
1937 if (advance == -1)
1938 ND_PRINT("\n\t (illegal length)");
1939 else if (advance == -2)
1940 goto trunc;
1941 else
1942 ND_PRINT("\n\t %s", buf);
1943 break;
1944 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1945 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1946 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1947 advance = decode_clnp_prefix(ndo, tptr, buf, buflen);
1948 if (advance == -1)
1949 ND_PRINT("\n\t (illegal prefix length)");
1950 else
1951 ND_PRINT("\n\t %s", buf);
1952 break;
1953 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1954 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1955 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1956 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, buflen);
1957 if (advance == -1)
1958 ND_PRINT("\n\t (illegal prefix length)");
1959 else
1960 ND_PRINT("\n\t %s", buf);
1961 break;
1962 default:
1963 /*
1964 * This should not happen, we should have been protected
1965 * by bgp_mp_af_print()'s return value.
1966 */
1967 ND_PRINT("\n\t ERROR: no AFI %u / SAFI %u decoder", af, safi);
1968 advance = -4;
1969 break;
1970 }
1971 return advance;
1972 trunc: /* we rely on the caller to recognize -2 return value */
1973 return -2;
1974 }
1975
1976 static const struct tok bgp_flags[] = {
1977 { 0x80, "O"},
1978 { 0x40, "T"},
1979 { 0x20, "P"},
1980 { 0x10, "E"},
1981 { 0, NULL }
1982 };
1983
1984 static int
1985 bgp_attr_print(netdissect_options *ndo,
1986 uint8_t atype, const u_char *pptr, u_int len,
1987 const unsigned attr_set_level)
1988 {
1989 /* allocate space for the largest possible string */
1990 char astostr[AS_STR_SIZE];
1991 u_int i;
1992 uint16_t af;
1993 uint8_t safi, snpa, nhlen;
1994 int advance;
1995 u_int tlen;
1996 const u_char *tptr;
1997 char buf[512];
1998 u_int as_size;
1999 int add_path4, add_path6;
2000 int ret;
2001
2002 tptr = pptr;
2003 tlen = len;
2004
2005 switch (atype) {
2006 case BGPTYPE_ORIGIN:
2007 if (len != 1)
2008 ND_PRINT("invalid len");
2009 else {
2010 ND_PRINT("%s", tok2str(bgp_origin_values,
2011 "Unknown Origin Typecode",
2012 GET_U_1(tptr)));
2013 }
2014 break;
2015
2016 /*
2017 * Process AS4 byte path and AS2 byte path attributes here.
2018 */
2019 case BGPTYPE_AS4_PATH:
2020 case BGPTYPE_AS_PATH:
2021 if (len % 2) {
2022 ND_PRINT("invalid len");
2023 break;
2024 }
2025 if (!len) {
2026 ND_PRINT("empty");
2027 break;
2028 }
2029
2030 /*
2031 * BGP updates exchanged between New speakers that support 4
2032 * byte AS, ASs are always encoded in 4 bytes. There is no
2033 * definitive way to find this, just by the packet's
2034 * contents. So, check for packet's TLV's sanity assuming
2035 * 2 bytes first, and it does not pass, assume that ASs are
2036 * encoded in 4 bytes format and move on.
2037 */
2038 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
2039
2040 while (tptr < pptr + len) {
2041 ND_PRINT("%s", tok2str(bgp_as_path_segment_open_values,
2042 "?", GET_U_1(tptr)));
2043 for (i = 0; i < GET_U_1(tptr + 1) * as_size; i += as_size) {
2044 ND_TCHECK_LEN(tptr + 2 + i, as_size);
2045 ND_PRINT("%s ",
2046 as_printf(ndo, astostr, sizeof(astostr),
2047 as_size == 2 ?
2048 GET_BE_U_2(tptr + i + 2) :
2049 GET_BE_U_4(tptr + i + 2)));
2050 }
2051 ND_PRINT("%s", tok2str(bgp_as_path_segment_close_values,
2052 "?", GET_U_1(tptr)));
2053 tptr += 2 + GET_U_1(tptr + 1) * as_size;
2054 }
2055 break;
2056 case BGPTYPE_NEXT_HOP:
2057 if (len != 4)
2058 ND_PRINT("invalid len");
2059 else {
2060 ND_PRINT("%s", GET_IPADDR_STRING(tptr));
2061 }
2062 break;
2063 case BGPTYPE_MULTI_EXIT_DISC:
2064 case BGPTYPE_LOCAL_PREF:
2065 if (len != 4)
2066 ND_PRINT("invalid len");
2067 else {
2068 ND_PRINT("%u", GET_BE_U_4(tptr));
2069 }
2070 break;
2071 case BGPTYPE_ATOMIC_AGGREGATE:
2072 if (len != 0)
2073 ND_PRINT("invalid len");
2074 break;
2075 case BGPTYPE_AGGREGATOR:
2076
2077 /*
2078 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
2079 * the length of this PA can be either 6 bytes or 8 bytes.
2080 */
2081 if (len != 6 && len != 8) {
2082 ND_PRINT("invalid len");
2083 break;
2084 }
2085 ND_TCHECK_LEN(tptr, len);
2086 if (len == 6) {
2087 ND_PRINT(" AS #%s, origin %s",
2088 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(tptr)),
2089 GET_IPADDR_STRING(tptr + 2));
2090 } else {
2091 ND_PRINT(" AS #%s, origin %s",
2092 as_printf(ndo, astostr, sizeof(astostr),
2093 GET_BE_U_4(tptr)), GET_IPADDR_STRING(tptr + 4));
2094 }
2095 break;
2096 case BGPTYPE_AGGREGATOR4:
2097 if (len != 8) {
2098 ND_PRINT("invalid len");
2099 break;
2100 }
2101 ND_PRINT(" AS #%s, origin %s",
2102 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)),
2103 GET_IPADDR_STRING(tptr + 4));
2104 break;
2105 case BGPTYPE_COMMUNITIES:
2106 if (len % 4) {
2107 ND_PRINT("invalid len");
2108 break;
2109 }
2110 while (tlen != 0) {
2111 uint32_t comm;
2112 ND_TCHECK_4(tptr);
2113 if (tlen < 4)
2114 goto trunc;
2115 comm = GET_BE_U_4(tptr);
2116 switch (comm) {
2117 case BGP_COMMUNITY_NO_EXPORT:
2118 ND_PRINT(" NO_EXPORT");
2119 break;
2120 case BGP_COMMUNITY_NO_ADVERT:
2121 ND_PRINT(" NO_ADVERTISE");
2122 break;
2123 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
2124 ND_PRINT(" NO_EXPORT_SUBCONFED");
2125 break;
2126 default:
2127 ND_PRINT("%u:%u%s",
2128 (comm >> 16) & 0xffff,
2129 comm & 0xffff,
2130 (tlen>4) ? ", " : "");
2131 break;
2132 }
2133 tlen -=4;
2134 tptr +=4;
2135 }
2136 break;
2137 case BGPTYPE_ORIGINATOR_ID:
2138 if (len != 4) {
2139 ND_PRINT("invalid len");
2140 break;
2141 }
2142 ND_PRINT("%s",GET_IPADDR_STRING(tptr));
2143 break;
2144 case BGPTYPE_CLUSTER_LIST:
2145 if (len % 4) {
2146 ND_PRINT("invalid len");
2147 break;
2148 }
2149 while (tlen != 0) {
2150 if (tlen < 4)
2151 goto trunc;
2152 ND_PRINT("%s%s",
2153 GET_IPADDR_STRING(tptr),
2154 (tlen>4) ? ", " : "");
2155 tlen -=4;
2156 tptr +=4;
2157 }
2158 break;
2159 case BGPTYPE_MP_REACH_NLRI:
2160 ND_TCHECK_3(tptr);
2161 if (tlen < 3)
2162 goto trunc;
2163 ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
2164 if (ret == -2)
2165 goto trunc;
2166 if (ret < 0)
2167 break;
2168
2169 tptr += 3;
2170 tlen -= 3;
2171
2172 ND_TCHECK_1(tptr);
2173 if (tlen < 1)
2174 goto trunc;
2175 nhlen = GET_U_1(tptr);
2176 tptr++;
2177 tlen--;
2178
2179 if (nhlen) {
2180 u_int nnh = 0;
2181 uint8_t tnhlen = nhlen;
2182 if (tlen < tnhlen)
2183 goto trunc;
2184 ND_PRINT("\n\t nexthop: ");
2185 while (tnhlen != 0) {
2186 if (nnh++ > 0) {
2187 ND_PRINT(", " );
2188 }
2189 switch(af<<8 | safi) {
2190 case (AFNUM_IP<<8 | SAFNUM_UNICAST):
2191 case (AFNUM_IP<<8 | SAFNUM_MULTICAST):
2192 case (AFNUM_IP<<8 | SAFNUM_UNIMULTICAST):
2193 case (AFNUM_IP<<8 | SAFNUM_LABUNICAST):
2194 case (AFNUM_IP<<8 | SAFNUM_RT_ROUTING_INFO):
2195 case (AFNUM_IP<<8 | SAFNUM_MULTICAST_VPN):
2196 case (AFNUM_IP<<8 | SAFNUM_MDT):
2197 if (tnhlen < sizeof(nd_ipv4)) {
2198 ND_PRINT("invalid len");
2199 tptr += tnhlen;
2200 tlen -= tnhlen;
2201 tnhlen = 0;
2202 } else {
2203 ND_PRINT("%s",GET_IPADDR_STRING(tptr));
2204 tptr += sizeof(nd_ipv4);
2205 tnhlen -= sizeof(nd_ipv4);
2206 tlen -= sizeof(nd_ipv4);
2207 }
2208 break;
2209 case (AFNUM_IP<<8 | SAFNUM_VPNUNICAST):
2210 case (AFNUM_IP<<8 | SAFNUM_VPNMULTICAST):
2211 case (AFNUM_IP<<8 | SAFNUM_VPNUNIMULTICAST):
2212 if (tnhlen < sizeof(nd_ipv4)+BGP_VPN_RD_LEN) {
2213 ND_PRINT("invalid len");
2214 tptr += tnhlen;
2215 tlen -= tnhlen;
2216 tnhlen = 0;
2217 } else {
2218 ND_PRINT("RD: %s, %s",
2219 bgp_vpn_rd_print(ndo, tptr),
2220 GET_IPADDR_STRING(tptr+BGP_VPN_RD_LEN));
2221 tptr += (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2222 tlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2223 tnhlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2224 }
2225 break;
2226 case (AFNUM_IP6<<8 | SAFNUM_UNICAST):
2227 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST):
2228 case (AFNUM_IP6<<8 | SAFNUM_UNIMULTICAST):
2229 case (AFNUM_IP6<<8 | SAFNUM_LABUNICAST):
2230 if (tnhlen < sizeof(nd_ipv6)) {
2231 ND_PRINT("invalid len");
2232 tptr += tnhlen;
2233 tlen -= tnhlen;
2234 tnhlen = 0;
2235 } else {
2236 ND_PRINT("%s", GET_IP6ADDR_STRING(tptr));
2237 tptr += sizeof(nd_ipv6);
2238 tlen -= sizeof(nd_ipv6);
2239 tnhlen -= sizeof(nd_ipv6);
2240 }
2241 break;
2242 case (AFNUM_IP6<<8 | SAFNUM_VPNUNICAST):
2243 case (AFNUM_IP6<<8 | SAFNUM_VPNMULTICAST):
2244 case (AFNUM_IP6<<8 | SAFNUM_VPNUNIMULTICAST):
2245 if (tnhlen < sizeof(nd_ipv6)+BGP_VPN_RD_LEN) {
2246 ND_PRINT("invalid len");
2247 tptr += tnhlen;
2248 tlen -= tnhlen;
2249 tnhlen = 0;
2250 } else {
2251 ND_PRINT("RD: %s, %s",
2252 bgp_vpn_rd_print(ndo, tptr),
2253 GET_IP6ADDR_STRING(tptr+BGP_VPN_RD_LEN));
2254 tptr += (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2255 tlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2256 tnhlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2257 }
2258 break;
2259 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
2260 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2261 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2262 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2263 if (tnhlen < sizeof(nd_ipv4)) {
2264 ND_PRINT("invalid len");
2265 tptr += tnhlen;
2266 tlen -= tnhlen;
2267 tnhlen = 0;
2268 } else {
2269 ND_PRINT("%s", GET_IPADDR_STRING(tptr));
2270 tptr += (sizeof(nd_ipv4));
2271 tlen -= (sizeof(nd_ipv4));
2272 tnhlen -= (sizeof(nd_ipv4));
2273 }
2274 break;
2275 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2276 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2277 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2278 ND_PRINT("%s", GET_ISONSAP_STRING(tptr, tnhlen));
2279 tptr += tnhlen;
2280 tlen -= tnhlen;
2281 tnhlen = 0;
2282 break;
2283
2284 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2285 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2286 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2287 if (tnhlen < BGP_VPN_RD_LEN+1) {
2288 ND_PRINT("invalid len");
2289 tptr += tnhlen;
2290 tlen -= tnhlen;
2291 tnhlen = 0;
2292 } else {
2293 ND_TCHECK_LEN(tptr, tnhlen);
2294 ND_PRINT("RD: %s, %s",
2295 bgp_vpn_rd_print(ndo, tptr),
2296 GET_ISONSAP_STRING(tptr+BGP_VPN_RD_LEN,tnhlen-BGP_VPN_RD_LEN));
2297 /* rfc986 mapped IPv4 address ? */
2298 if (GET_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
2299 ND_PRINT(" = %s", GET_IPADDR_STRING(tptr+BGP_VPN_RD_LEN+4));
2300 /* rfc1888 mapped IPv6 address ? */
2301 else if (GET_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
2302 ND_PRINT(" = %s", GET_IP6ADDR_STRING(tptr+BGP_VPN_RD_LEN+3));
2303 tptr += tnhlen;
2304 tlen -= tnhlen;
2305 tnhlen = 0;
2306 }
2307 break;
2308 default:
2309 /*
2310 * bgp_mp_af_print() should have saved us from
2311 * an unsupported AFI/SAFI.
2312 */
2313 ND_PRINT("ERROR: no AFI %u/SAFI %u nexthop decoder", af, safi);
2314 tptr += tnhlen;
2315 tlen -= tnhlen;
2316 tnhlen = 0;
2317 goto done;
2318 break;
2319 }
2320 }
2321 }
2322 ND_PRINT(", nh-length: %u", nhlen);
2323
2324 /* As per RFC 2858; this is reserved in RFC 4760 */
2325 if (tlen < 1)
2326 goto trunc;
2327 snpa = GET_U_1(tptr);
2328 tptr++;
2329 tlen--;
2330
2331 if (snpa) {
2332 ND_PRINT("\n\t %u SNPA", snpa);
2333 for (/*nothing*/; snpa != 0; snpa--) {
2334 uint8_t snpalen;
2335 if (tlen < 1)
2336 goto trunc;
2337 snpalen = GET_U_1(tptr);
2338 ND_PRINT("\n\t %u bytes", snpalen);
2339 tptr++;
2340 tlen--;
2341 if (tlen < snpalen)
2342 goto trunc;
2343 ND_TCHECK_LEN(tptr, snpalen);
2344 tptr += snpalen;
2345 tlen -= snpalen;
2346 }
2347 } else {
2348 ND_PRINT(", no SNPA");
2349 }
2350
2351 add_path4 = check_add_path(ndo, tptr,
2352 (len-ND_BYTES_BETWEEN(pptr, tptr)), 32);
2353 add_path6 = check_add_path(ndo, tptr,
2354 (len-ND_BYTES_BETWEEN(pptr, tptr)), 128);
2355
2356 while (tptr < pptr + len) {
2357 advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf),
2358 add_path4, add_path6);
2359 if (advance == -2)
2360 goto trunc;
2361 if (advance < 0)
2362 break;
2363 tptr += advance;
2364 }
2365 break;
2366
2367 case BGPTYPE_MP_UNREACH_NLRI:
2368 ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
2369 ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
2370 if (ret == -2)
2371 goto trunc;
2372 if (ret < 0)
2373 break;
2374
2375 if (len == BGP_MP_NLRI_MINSIZE)
2376 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2377
2378 tptr += 3;
2379
2380 add_path4 = check_add_path(ndo, tptr,
2381 (len-ND_BYTES_BETWEEN(pptr, tptr)), 32);
2382 add_path6 = check_add_path(ndo, tptr,
2383 (len-ND_BYTES_BETWEEN(pptr, tptr)), 128);
2384
2385 while (tptr < pptr + len) {
2386 advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf),
2387 add_path4, add_path6);
2388 if (advance == -2)
2389 goto trunc;
2390 if (advance < 0)
2391 break;
2392 tptr += advance;
2393 }
2394 break;
2395 case BGPTYPE_EXTD_COMMUNITIES:
2396 if (len % 8) {
2397 ND_PRINT("invalid len");
2398 break;
2399 }
2400 while (tlen != 0) {
2401 uint16_t extd_comm;
2402
2403 ND_TCHECK_2(tptr);
2404 if (tlen < 2)
2405 goto trunc;
2406 extd_comm=GET_BE_U_2(tptr);
2407
2408 ND_PRINT("\n\t %s (0x%04x), Flags [%s]",
2409 tok2str(bgp_extd_comm_subtype_values,
2410 "unknown extd community typecode",
2411 extd_comm),
2412 extd_comm,
2413 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm));
2414
2415 ND_TCHECK_8(tptr);
2416 if (tlen < 8)
2417 goto trunc;
2418 ND_PRINT(": ");
2419 bgp_extended_community_print(ndo, tptr);
2420 tlen -= 8;
2421 tptr += 8;
2422 }
2423 break;
2424
2425 case BGPTYPE_PMSI_TUNNEL:
2426 {
2427 uint8_t tunnel_type, flags;
2428
2429 ND_TCHECK_5(tptr);
2430 if (tlen < 5)
2431 goto trunc;
2432 flags = GET_U_1(tptr);
2433 tunnel_type = GET_U_1(tptr + 1);
2434
2435 ND_PRINT("\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2436 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2437 tunnel_type,
2438 bittok2str(bgp_pmsi_flag_values, "none", flags),
2439 GET_BE_U_3(tptr + 2)>>4);
2440
2441 tptr +=5;
2442 tlen -= 5;
2443
2444 switch (tunnel_type) {
2445 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2446 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2447 ND_PRINT("\n\t Sender %s, P-Group %s",
2448 GET_IPADDR_STRING(tptr),
2449 GET_IPADDR_STRING(tptr+4));
2450 break;
2451
2452 case BGP_PMSI_TUNNEL_PIM_SSM:
2453 ND_PRINT("\n\t Root-Node %s, P-Group %s",
2454 GET_IPADDR_STRING(tptr),
2455 GET_IPADDR_STRING(tptr+4));
2456 break;
2457 case BGP_PMSI_TUNNEL_INGRESS:
2458 ND_PRINT("\n\t Tunnel-Endpoint %s",
2459 GET_IPADDR_STRING(tptr));
2460 break;
2461 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2462 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2463 ND_PRINT("\n\t Root-Node %s, LSP-ID 0x%08x",
2464 GET_IPADDR_STRING(tptr),
2465 GET_BE_U_4(tptr + 4));
2466 break;
2467 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2468 ND_PRINT("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2469 GET_IPADDR_STRING(tptr),
2470 GET_BE_U_4(tptr + 4));
2471 break;
2472 default:
2473 if (ndo->ndo_vflag <= 1) {
2474 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2475 }
2476 }
2477 break;
2478 }
2479 case BGPTYPE_AIGP:
2480 {
2481 uint8_t type;
2482 uint16_t length;
2483
2484 while (tlen >= 3) {
2485 type = GET_U_1(tptr);
2486 length = GET_BE_U_2(tptr + 1);
2487 tptr += 3;
2488 tlen -= 3;
2489
2490 ND_PRINT("\n\t %s TLV (%u), length %u",
2491 tok2str(bgp_aigp_values, "Unknown", type),
2492 type, length);
2493
2494 if (length < 3)
2495 goto trunc;
2496 length -= 3;
2497
2498 /*
2499 * Check if we can read the TLV data.
2500 */
2501 if (tlen < length)
2502 goto trunc;
2503
2504 switch (type) {
2505
2506 case BGP_AIGP_TLV:
2507 if (length < 8)
2508 goto trunc;
2509 ND_PRINT(", metric %" PRIu64,
2510 GET_BE_U_8(tptr));
2511 break;
2512
2513 default:
2514 if (ndo->ndo_vflag <= 1) {
2515 print_unknown_data(ndo, tptr,"\n\t ", length);
2516 }
2517 }
2518
2519 tptr += length;
2520 tlen -= length;
2521 }
2522 break;
2523 }
2524 case BGPTYPE_ATTR_SET:
2525 ND_TCHECK_4(tptr);
2526 if (len < 4)
2527 goto trunc;
2528 ND_PRINT("\n\t Origin AS: %s",
2529 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)));
2530 tptr += 4;
2531 len -= 4;
2532
2533 while (len) {
2534 u_int aflags, alenlen, alen;
2535
2536 ND_TCHECK_2(tptr);
2537 if (len < 2) {
2538 ND_PRINT(" [path attr too short]");
2539 tptr += len;
2540 break;
2541 }
2542 aflags = GET_U_1(tptr);
2543 atype = GET_U_1(tptr + 1);
2544 tptr += 2;
2545 len -= 2;
2546 alenlen = bgp_attr_lenlen(aflags, tptr);
2547 ND_TCHECK_LEN(tptr, alenlen);
2548 if (len < alenlen) {
2549 ND_PRINT(" [path attr too short]");
2550 tptr += len;
2551 break;
2552 }
2553 alen = bgp_attr_len(aflags, tptr);
2554 tptr += alenlen;
2555 len -= alenlen;
2556
2557 ND_PRINT("\n\t %s (%u), length: %u",
2558 tok2str(bgp_attr_values,
2559 "Unknown Attribute", atype),
2560 atype,
2561 alen);
2562
2563 if (aflags) {
2564 ND_PRINT(", Flags [%s",
2565 bittok2str_nosep(bgp_flags, "", aflags));
2566 if (aflags & 0xf)
2567 ND_PRINT("+%x", aflags & 0xf);
2568 ND_PRINT("]");
2569 }
2570 ND_PRINT(": ");
2571 if (len < alen) {
2572 ND_PRINT(" [path attr too short]");
2573 tptr += len;
2574 break;
2575 }
2576 /*
2577 * The protocol encoding per se allows ATTR_SET to be nested
2578 * as many times as the message can accommodate. This printer
2579 * used to be able to recurse into ATTR_SET contents until the
2580 * stack exhaustion, but now there is a limit on that (if live
2581 * protocol exchange goes that many levels deep, something is
2582 * probably wrong anyway). Feel free to refine this value if
2583 * you can find the spec with respective normative text.
2584 */
2585 if (attr_set_level == 10)
2586 ND_PRINT("(too many nested levels, not recursing)");
2587 else if (!bgp_attr_print(ndo, atype, tptr, alen, attr_set_level + 1))
2588 return 0;
2589 tptr += alen;
2590 len -= alen;
2591 }
2592 break;
2593
2594 case BGPTYPE_LARGE_COMMUNITY:
2595 if (len == 0 || len % 12) {
2596 ND_PRINT("invalid len");
2597 break;
2598 }
2599 ND_PRINT("\n\t ");
2600 while (len != 0) {
2601 ND_PRINT("%u:%u:%u%s",
2602 GET_BE_U_4(tptr),
2603 GET_BE_U_4(tptr + 4),
2604 GET_BE_U_4(tptr + 8),
2605 (len > 12) ? ", " : "");
2606 tptr += 12;
2607 /*
2608 * len will always be a multiple of 12, as per the above,
2609 * so this will never underflow.
2610 */
2611 len -= 12;
2612 }
2613 break;
2614 case BGPTYPE_BGPSEC_PATH:
2615 {
2616 uint16_t sblen, splen;
2617
2618 splen = GET_BE_U_2(tptr);
2619
2620 /*
2621 * A secure path has a minimum length of 8 bytes:
2622 * 2 bytes length field
2623 * 6 bytes per secure path segment
2624 */
2625 ND_ICHECKMSG_U("secure path length", splen, <, 8);
2626
2627 ND_PRINT("\n\t Secure Path Length: %u", splen);
2628
2629 tptr += 2;
2630 splen -= 2;
2631 /* Make sure the secure path length does not signal trailing bytes */
2632 if (splen % 6) {
2633 ND_PRINT(" [total segments length %u != N x 6]", splen);
2634 goto invalid;
2635 }
2636
2637 /* Parse secure path segments */
2638 while (splen != 0) {
2639 uint8_t pcount = GET_U_1(tptr);
2640 uint8_t flags = GET_U_1(tptr + 1);
2641 uint32_t asn = GET_BE_U_4(tptr + 2);
2642 ND_PRINT("\n\t Secure Path Segment: pCount: %u, Flags: [%s] (0x%02x), AS: %u",
2643 pcount,
2644 bittok2str(bgp_bgpsec_bitmap_str, "none", flags),
2645 flags,
2646 asn);
2647 tptr += 6;
2648 splen -= 6;
2649 }
2650
2651 sblen = GET_BE_U_2(tptr);
2652
2653 ND_PRINT("\n\t Signature Block: Length: %u, Algo ID: %u",
2654 sblen,
2655 GET_U_1(tptr + 2));
2656
2657 tptr += 3;
2658 sblen -= 3;
2659 /* Parse signature segments */
2660 while (sblen > 0) {
2661 uint16_t siglen;
2662
2663 ND_PRINT("\n\t Signature Segment:\n\t SKI: ");
2664 ND_ICHECKMSG_U("remaining length", sblen, <, 20);
2665 hex_print(ndo, "\n\t ", tptr, 20);
2666 tptr += 20;
2667 sblen -= 20;
2668 ND_ICHECKMSG_U("remaining length", sblen, <, 2);
2669 siglen = GET_BE_U_2(tptr);
2670 tptr += 2;
2671 sblen -= 2;
2672
2673 ND_PRINT("\n\t Length: %u", siglen);
2674 ND_ICHECKMSG_U("remaining length", sblen, <, siglen);
2675 ND_PRINT("\n\t Signature:");
2676 hex_print(ndo, "\n\t ", tptr, siglen);
2677 tptr += siglen;
2678 sblen -= siglen;
2679 }
2680 break;
2681 }
2682 case BGPTYPE_OTC:
2683 {
2684 if (len < 4) {
2685 ND_PRINT("invalid len");
2686 break;
2687 }
2688 ND_PRINT("\n\t OTC %u", GET_BE_U_4(pptr));
2689 break;
2690 }
2691 default:
2692 ND_TCHECK_LEN(pptr, len);
2693 ND_PRINT("\n\t no Attribute %u decoder", atype); /* we have no decoder for the attribute */
2694 if (ndo->ndo_vflag <= 1)
2695 print_unknown_data(ndo, pptr, "\n\t ", len);
2696 break;
2697 }
2698 done:
2699 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2700 ND_TCHECK_LEN(pptr, len);
2701 print_unknown_data(ndo, pptr, "\n\t ", len);
2702 }
2703 return 1;
2704
2705 invalid:
2706 nd_print_invalid(ndo);
2707 return 1;
2708
2709 trunc:
2710 return 0;
2711 }
2712
2713 static void
2714 bgp_capabilities_print(netdissect_options *ndo,
2715 const u_char *opt, u_int caps_len)
2716 {
2717 /* allocate space for the largest possible string */
2718 char astostr[AS_STR_SIZE];
2719 u_int cap_type, cap_len, tcap_len, cap_offset;
2720 u_int i = 0;
2721
2722 while (i < caps_len) {
2723 ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
2724 cap_type=GET_U_1(opt + i);
2725 cap_len=GET_U_1(opt + i + 1);
2726 ND_PRINT("\n\t %s (%u), length: %u",
2727 tok2str(bgp_capcode_values, "Unknown", cap_type),
2728 cap_type,
2729 cap_len);
2730 ND_TCHECK_LEN(opt + 2 + i, cap_len);
2731 switch (cap_type) {
2732 case BGP_CAPCODE_MP:
2733 /* AFI (16 bits), Reserved (8 bits), SAFI (8 bits) */
2734 if (cap_len < 4) {
2735 ND_PRINT(" (too short, < 4)");
2736 return;
2737 }
2738 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u)",
2739 tok2str(af_values, "Unknown", GET_BE_U_2(opt + i + 2)),
2740 GET_BE_U_2(opt + i + 2),
2741 tok2str(bgp_safi_values, "Unknown", GET_U_1(opt + i + 5)),
2742 GET_U_1(opt + i + 5));
2743 break;
2744 case BGP_CAPCODE_BGPSEC:
2745 /* Version (4 bits), Direction (1 bit), Flags (3 bits), AFI (16 bits) */
2746 cap_offset = 1;
2747 /* The capability length [...] MUST be set to 3. */
2748 if (cap_len != 3) {
2749 ND_PRINT(" [%u != 3]", cap_len);
2750 return;
2751 }
2752
2753 ND_PRINT("\n\t\tVersion %u, Direction %s (%u), AFI %s (%u)",
2754 GET_U_1(opt + i + 2)&0xf0,
2755 (GET_U_1(opt + i + 2)&0x08) ? "Send" : "Receive",
2756 (GET_U_1(opt + i + 2)&0x08)>>3,
2757 bittok2str(af_values, "Unknown",
2758 GET_BE_U_2(opt + i + cap_offset + 2)),
2759 GET_BE_U_2(opt + i + cap_offset + 2));
2760 break;
2761 case BGP_CAPCODE_ML:
2762 cap_offset = 2;
2763 tcap_len = cap_len;
2764 while (tcap_len >= 4) {
2765 ND_PRINT( "\n\t\tAFI %s (%u), SAFI %s (%u), Count: %u",
2766 tok2str(af_values, "Unknown",
2767 GET_BE_U_2(opt + i + cap_offset)),
2768 GET_BE_U_2(opt + i + cap_offset),
2769 tok2str(bgp_safi_values, "Unknown",
2770 GET_U_1(opt + i + cap_offset + 2)),
2771 GET_U_1(opt + i + cap_offset + 2),
2772 GET_U_1(opt + i + cap_offset + 3));
2773 tcap_len -= 4;
2774 cap_offset += 4;
2775 }
2776 break;
2777 case BGP_CAPCODE_RESTART:
2778 /* Restart Flags (4 bits), Restart Time in seconds (12 bits) */
2779 if (cap_len < 2) {
2780 ND_PRINT(" (too short, < 2)");
2781 return;
2782 }
2783 tcap_len=cap_len;
2784 ND_PRINT("\n\t\tRestart Flags: [%s], Restart Time %us",
2785 bittok2str(bgp_graceful_restart_comm_flag_values,
2786 "none", GET_U_1(opt + i + 2) >> 4),
2787 GET_BE_U_2(opt + i + 2)&0xfff);
2788 tcap_len-=2;
2789 cap_offset=4;
2790 while(tcap_len>=4) {
2791 ND_PRINT("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2792 tok2str(af_values,"Unknown",
2793 GET_BE_U_2(opt + i + cap_offset)),
2794 GET_BE_U_2(opt + i + cap_offset),
2795 tok2str(bgp_safi_values,"Unknown",
2796 GET_U_1(opt + i + cap_offset + 2)),
2797 GET_U_1(opt + (i + cap_offset + 2)),
2798 ((GET_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" );
2799 tcap_len -= 4;
2800 cap_offset += 4;
2801 }
2802 break;
2803 case BGP_CAPCODE_ROLE:
2804 if (cap_len < 1) {
2805 ND_PRINT(" (too short, < 1)");
2806 return;
2807 }
2808 ND_PRINT("\n\t\tRole name %s (%u)",
2809 tok2str(bgp_role_values, "Unassigned",
2810 GET_U_1(opt + i + 2)), GET_U_1(opt + i + 2));
2811 break;
2812 case BGP_CAPCODE_RR:
2813 case BGP_CAPCODE_LLGR:
2814 case BGP_CAPCODE_RR_CISCO:
2815 case BGP_CAPCODE_EXT_MSG:
2816 case BGP_CAPCODE_ENH_RR:
2817 break;
2818 case BGP_CAPCODE_AS_NEW:
2819 /*
2820 * Extract the 4 byte AS number encoded.
2821 */
2822 if (cap_len < 4) {
2823 ND_PRINT(" (too short, < 4)");
2824 return;
2825 }
2826 ND_PRINT("\n\t\t 4 Byte AS %s",
2827 as_printf(ndo, astostr, sizeof(astostr),
2828 GET_BE_U_4(opt + i + 2)));
2829 break;
2830 case BGP_CAPCODE_ADD_PATH:
2831 if (cap_len == 0) {
2832 ND_PRINT(" (bogus)"); /* length */
2833 break;
2834 }
2835 tcap_len=cap_len;
2836 cap_offset=2;
2837 while (tcap_len != 0) {
2838 if (tcap_len < 4) {
2839 nd_print_invalid(ndo);
2840 break;
2841 }
2842 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2843 tok2str(af_values,"Unknown",GET_BE_U_2(opt + i + cap_offset)),
2844 GET_BE_U_2(opt + i + cap_offset),
2845 tok2str(bgp_safi_values,"Unknown",GET_U_1(opt + i + cap_offset + 2)),
2846 GET_U_1(opt + (i + cap_offset + 2)),
2847 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",GET_U_1(opt + i + cap_offset + 3))
2848 );
2849 tcap_len -= 4;
2850 cap_offset += 4;
2851 }
2852 break;
2853 default:
2854 ND_PRINT("\n\t\tno decoder for Capability %u",
2855 cap_type);
2856 if (ndo->ndo_vflag <= 1)
2857 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2858 cap_len);
2859 break;
2860 }
2861 if (ndo->ndo_vflag > 1 && cap_len != 0) {
2862 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2863 }
2864 i += BGP_CAP_HEADER_SIZE + cap_len;
2865 }
2866 return;
2867
2868 trunc:
2869 nd_print_trunc(ndo);
2870 }
2871
2872 static void
2873 bgp_open_print(netdissect_options *ndo,
2874 const u_char *dat, u_int length)
2875 {
2876 /* allocate space for the largest possible string */
2877 char astostr[AS_STR_SIZE];
2878 const struct bgp_open *bgp_open_header;
2879 u_int optslen;
2880 uint8_t opsttype;
2881 const struct bgp_opt *bgpopt;
2882 const u_char *opt;
2883 u_int i;
2884 uint8_t extended_opt_params = 0;
2885 u_int open_size = BGP_OPEN_SIZE;
2886 u_int opt_size = BGP_OPT_SIZE;
2887
2888 ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
2889 if (length < BGP_OPEN_SIZE)
2890 goto trunc;
2891
2892 bgp_open_header = (const struct bgp_open *)dat;
2893
2894 ND_PRINT("\n\t Version %u, ",
2895 GET_U_1(bgp_open_header->bgpo_version));
2896 ND_PRINT("my AS %s, ",
2897 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(bgp_open_header->bgpo_myas)));
2898 ND_PRINT("Holdtime %us, ",
2899 GET_BE_U_2(bgp_open_header->bgpo_holdtime));
2900 ND_PRINT("ID %s", GET_IPADDR_STRING(bgp_open_header->bgpo_id));
2901 optslen = GET_U_1(bgp_open_header->bgpo_optlen);
2902 opsttype = GET_U_1(bgp_open_header->bgpo_opttype);
2903 if (opsttype == BGP_OPEN_NON_EXT_OPT_TYPE_EXTENDED_LENGTH) {
2904 optslen = GET_BE_U_2(bgp_open_header->bgpo_optlen_extended);
2905 extended_opt_params = 1;
2906 open_size += 3;
2907 opt_size += 1;
2908 }
2909 ND_PRINT("\n\t Optional parameters%s, length: %u",
2910 extended_opt_params ? " (Extended)" : "", optslen);
2911
2912 opt = dat + open_size;
2913 length -= open_size;
2914
2915 i = 0;
2916 while (i < optslen) {
2917 uint8_t opt_type;
2918 uint16_t opt_len;
2919
2920 ND_TCHECK_LEN(opt + i, opt_size);
2921 if (length < opt_size + i)
2922 goto trunc;
2923 bgpopt = (const struct bgp_opt *)(opt + i);
2924 opt_type = GET_U_1(bgpopt->bgpopt_type);
2925 opt_len = extended_opt_params ? GET_BE_U_2(bgpopt->bgpopt_len)
2926 : GET_U_1(bgpopt->bgpopt_len);
2927 if (opt_size + i + opt_len > optslen) {
2928 ND_PRINT("\n\t Option %u, length: %u, goes past the end of the options",
2929 opt_type, opt_len);
2930 break;
2931 }
2932
2933 ND_PRINT("\n\t Option %s (%u), length: %u",
2934 tok2str(bgp_opt_values,"Unknown",opt_type),
2935 opt_type,
2936 opt_len);
2937
2938 /* now let's decode the options we know*/
2939 switch(opt_type) {
2940
2941 case BGP_OPT_CAP:
2942 bgp_capabilities_print(ndo, opt + opt_size + i,
2943 opt_len);
2944 break;
2945
2946 case BGP_OPT_AUTH:
2947 default:
2948 ND_PRINT("\n\t no decoder for option %u",
2949 opt_type);
2950 break;
2951 }
2952 i += opt_size + opt_len;
2953 }
2954 return;
2955 trunc:
2956 nd_print_trunc(ndo);
2957 }
2958
2959 static void
2960 bgp_update_print(netdissect_options *ndo,
2961 const u_char *dat, u_int length)
2962 {
2963 const u_char *p;
2964 u_int withdrawn_routes_len;
2965 char buf[512];
2966 int wpfx;
2967 u_int len;
2968 int i;
2969 int add_path;
2970 u_int path_id = 0;
2971
2972 ND_TCHECK_LEN(dat, BGP_SIZE);
2973 if (length < BGP_SIZE)
2974 goto trunc;
2975 p = dat + BGP_SIZE;
2976 length -= BGP_SIZE;
2977
2978 /* Unfeasible routes */
2979 ND_TCHECK_2(p);
2980 if (length < 2)
2981 goto trunc;
2982 withdrawn_routes_len = GET_BE_U_2(p);
2983 p += 2;
2984 length -= 2;
2985 if (withdrawn_routes_len > 1) {
2986 /*
2987 * Without keeping state from the original NLRI message,
2988 * it's not possible to tell if this a v4 or v6 route,
2989 * so only try to decode it if we're not v6 enabled.
2990 */
2991 ND_TCHECK_LEN(p, withdrawn_routes_len);
2992 if (length < withdrawn_routes_len)
2993 goto trunc;
2994 ND_PRINT("\n\t Withdrawn routes:");
2995 add_path = check_add_path(ndo, p, withdrawn_routes_len, 32);
2996 while (withdrawn_routes_len != 0) {
2997 if (add_path) {
2998 if (withdrawn_routes_len < 4) {
2999 p += withdrawn_routes_len;
3000 length -= withdrawn_routes_len;
3001 break;
3002 }
3003 path_id = GET_BE_U_4(p);
3004 p += 4;
3005 length -= 4;
3006 withdrawn_routes_len -= 4;
3007 }
3008 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
3009 if (wpfx == -1) {
3010 ND_PRINT("\n\t (illegal prefix length)");
3011 break;
3012 } else if (wpfx == -2)
3013 goto trunc; /* bytes left, but not enough */
3014 else {
3015 ND_PRINT("\n\t %s", buf);
3016 if (add_path) {
3017 ND_PRINT(" Path Id: %u", path_id);
3018 }
3019 p += wpfx;
3020 length -= wpfx;
3021 withdrawn_routes_len -= wpfx;
3022 }
3023 }
3024 } else {
3025 ND_TCHECK_LEN(p, withdrawn_routes_len);
3026 if (length < withdrawn_routes_len)
3027 goto trunc;
3028 p += withdrawn_routes_len;
3029 length -= withdrawn_routes_len;
3030 }
3031
3032 ND_TCHECK_2(p);
3033 if (length < 2)
3034 goto trunc;
3035 len = GET_BE_U_2(p);
3036 p += 2;
3037 length -= 2;
3038
3039 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
3040 /* No withdrawn routes, no path attributes, no NLRI */
3041 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
3042 return;
3043 }
3044
3045 if (len) {
3046 /* Make sure the path attributes don't go past the end of the packet */
3047 if (length < len)
3048 goto trunc;
3049 /* do something more useful!*/
3050 while (len) {
3051 uint8_t aflags, atype, alenlen;
3052 uint16_t alen;
3053
3054 ND_TCHECK_2(p);
3055 if (length < 2)
3056 goto trunc;
3057 if (len < 2) {
3058 ND_PRINT("\n\t [path attrs too short]");
3059 p += len;
3060 length -= len;
3061 break;
3062 }
3063 aflags = GET_U_1(p);
3064 atype = GET_U_1(p + 1);
3065 p += 2;
3066 len -= 2;
3067 length -= 2;
3068 alenlen = bgp_attr_lenlen(aflags, p);
3069 ND_TCHECK_LEN(p, alenlen);
3070 if (length < alenlen)
3071 goto trunc;
3072 if (len < alenlen) {
3073 ND_PRINT("\n\t [path attrs too short]");
3074 p += len;
3075 length -= len;
3076 break;
3077 }
3078 alen = bgp_attr_len(aflags, p);
3079 p += alenlen;
3080 len -= alenlen;
3081 length -= alenlen;
3082
3083 ND_PRINT("\n\t %s (%u), length: %u",
3084 tok2str(bgp_attr_values, "Unknown Attribute", atype),
3085 atype,
3086 alen);
3087
3088 if (aflags) {
3089 ND_PRINT(", Flags [%s",
3090 bittok2str_nosep(bgp_flags, "", aflags));
3091 if (aflags & 0xf)
3092 ND_PRINT("+%x", aflags & 0xf);
3093 ND_PRINT("]: ");
3094 }
3095 if (len < alen) {
3096 ND_PRINT(" [path attrs too short]");
3097 p += len;
3098 length -= len;
3099 break;
3100 }
3101 if (length < alen)
3102 goto trunc;
3103 if (!bgp_attr_print(ndo, atype, p, alen, 0))
3104 goto trunc;
3105 p += alen;
3106 len -= alen;
3107 length -= alen;
3108 }
3109 }
3110
3111 if (length) {
3112 add_path = check_add_path(ndo, p, length, 32);
3113 ND_PRINT("\n\t Updated routes:");
3114 while (length != 0) {
3115 if (add_path) {
3116 ND_TCHECK_4(p);
3117 if (length < 4)
3118 goto trunc;
3119 path_id = GET_BE_U_4(p);
3120 p += 4;
3121 length -= 4;
3122 }
3123 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
3124 if (i == -1) {
3125 ND_PRINT("\n\t (illegal prefix length)");
3126 break;
3127 } else if (i == -2)
3128 goto trunc; /* bytes left, but not enough */
3129 else {
3130 ND_PRINT("\n\t %s", buf);
3131 if (add_path) {
3132 ND_PRINT(" Path Id: %u", path_id);
3133 }
3134 p += i;
3135 length -= i;
3136 }
3137 }
3138 }
3139 return;
3140 trunc:
3141 nd_print_trunc(ndo);
3142 }
3143
3144 static void
3145 bgp_notification_print_code(netdissect_options *ndo,
3146 const u_char *dat, u_int length,
3147 uint8_t bgpn_major, uint8_t bgpn_minor)
3148 {
3149 ND_PRINT(", %s (%u)",
3150 tok2str(bgp_notify_major_values, "Unknown Error",
3151 bgpn_major),
3152 bgpn_major);
3153
3154 switch (bgpn_major) {
3155
3156 case BGP_NOTIFY_MAJOR_MSG:
3157 ND_PRINT(", subcode %s (%u)",
3158 tok2str(bgp_notify_minor_msg_values, "Unknown",
3159 bgpn_minor),
3160 bgpn_minor);
3161 break;
3162 case BGP_NOTIFY_MAJOR_OPEN:
3163 ND_PRINT(", subcode %s (%u)",
3164 tok2str(bgp_notify_minor_open_values, "Unknown",
3165 bgpn_minor),
3166 bgpn_minor);
3167 break;
3168 case BGP_NOTIFY_MAJOR_UPDATE:
3169 ND_PRINT(", subcode %s (%u)",
3170 tok2str(bgp_notify_minor_update_values, "Unknown",
3171 bgpn_minor),
3172 bgpn_minor);
3173 break;
3174 case BGP_NOTIFY_MAJOR_FSM:
3175 ND_PRINT(" subcode %s (%u)",
3176 tok2str(bgp_notify_minor_fsm_values, "Unknown",
3177 bgpn_minor),
3178 bgpn_minor);
3179 break;
3180 case BGP_NOTIFY_MAJOR_CAP:
3181 ND_PRINT(" subcode %s (%u)",
3182 tok2str(bgp_notify_minor_cap_values, "Unknown",
3183 bgpn_minor),
3184 bgpn_minor);
3185 break;
3186 case BGP_NOTIFY_MAJOR_CEASE:
3187 ND_PRINT(", subcode %s (%u)",
3188 tok2str(bgp_notify_minor_cease_values, "Unknown",
3189 bgpn_minor),
3190 bgpn_minor);
3191
3192 /* RFC 4486 mentions optionally 7 bytes
3193 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
3194 */
3195 if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= 7) {
3196 ND_PRINT(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
3197 tok2str(af_values, "Unknown", GET_BE_U_2(dat)),
3198 GET_BE_U_2(dat),
3199 tok2str(bgp_safi_values, "Unknown", GET_U_1((dat + 2))),
3200 GET_U_1((dat + 2)),
3201 GET_BE_U_4(dat + 3));
3202 }
3203 /*
3204 * RFC 9003 describes a method to send a communication
3205 * intended for human consumption regarding the Administrative Shutdown
3206 */
3207 if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
3208 bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
3209 length >= 1) {
3210 uint8_t shutdown_comm_length = GET_U_1(dat);
3211 uint8_t remainder_offset = 0;
3212 /* garbage, hexdump it all */
3213 if (shutdown_comm_length > length - 1) {
3214 ND_PRINT(", invalid Shutdown Communication length");
3215 } else if (shutdown_comm_length == 0) {
3216 ND_PRINT(", empty Shutdown Communication");
3217 remainder_offset += 1;
3218 }
3219 /* a proper shutdown communication */
3220 else {
3221 ND_PRINT(", Shutdown Communication (length: %u): \"", shutdown_comm_length);
3222 nd_printjn(ndo, dat+1, shutdown_comm_length);
3223 ND_PRINT("\"");
3224 remainder_offset += shutdown_comm_length + 1;
3225 }
3226 /* if there is trailing data, hexdump it */
3227 if(length - remainder_offset > 0) {
3228 ND_PRINT(", Data: (length: %u)", length - remainder_offset);
3229 hex_print(ndo, "\n\t\t", dat + remainder_offset, length - remainder_offset);
3230 }
3231 }
3232 /*
3233 * RFC8538 describes the Hard Reset cease subcode, which contains another
3234 * notification code and subcode.
3235 */
3236 if (bgpn_minor == BGP_NOTIFY_MINOR_CEASE_HARDRESET && length >= 2) {
3237 bgpn_major = GET_U_1(dat++);
3238 bgpn_minor = GET_U_1(dat++);
3239 length -= 2;
3240 bgp_notification_print_code(ndo, dat, length, bgpn_major, bgpn_minor);
3241 }
3242 break;
3243 default:
3244 if (bgpn_minor != 0) {
3245 ND_PRINT(", subcode %u", bgpn_minor);
3246 }
3247 break;
3248 }
3249
3250 return;
3251 }
3252
3253 static void
3254 bgp_notification_print(netdissect_options *ndo,
3255 const u_char *dat, u_int length)
3256 {
3257 const struct bgp_notification *bgp_notification_header;
3258 uint8_t bgpn_major, bgpn_minor;
3259
3260 ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
3261 if (length<BGP_NOTIFICATION_SIZE)
3262 return;
3263
3264 bgp_notification_header = (const struct bgp_notification *)dat;
3265 bgpn_major = GET_U_1(bgp_notification_header->bgpn_major);
3266 bgpn_minor = GET_U_1(bgp_notification_header->bgpn_minor);
3267 bgp_notification_print_code(ndo, dat + BGP_NOTIFICATION_SIZE,
3268 length - BGP_NOTIFICATION_SIZE, bgpn_major, bgpn_minor);
3269 return;
3270 trunc:
3271 nd_print_trunc(ndo);
3272 }
3273
3274 static void
3275 bgp_route_refresh_print(netdissect_options *ndo,
3276 const u_char *pptr, u_int len)
3277 {
3278 const struct bgp_route_refresh *bgp_route_refresh_header;
3279
3280 /* some little sanity checking */
3281 if (len<BGP_ROUTE_REFRESH_SIZE)
3282 return;
3283
3284 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
3285
3286 ND_PRINT("\n\t AFI %s (%u), SAFI %s (%u), Subtype %s (%u)",
3287 tok2str(af_values, "Unknown",
3288 GET_BE_U_2(bgp_route_refresh_header->afi)),
3289 GET_BE_U_2(bgp_route_refresh_header->afi),
3290 tok2str(bgp_safi_values, "Unknown",
3291 GET_U_1(bgp_route_refresh_header->safi)),
3292 GET_U_1(bgp_route_refresh_header->safi),
3293 tok2str(bgp_route_refresh_subtype_values, "Unknown",
3294 GET_U_1(bgp_route_refresh_header->subtype)),
3295 GET_U_1(bgp_route_refresh_header->subtype));
3296
3297 /* ORF */
3298 if (len >= BGP_ROUTE_REFRESH_SIZE_ORF) {
3299 const struct bgp_route_refresh_orf *orf_header;
3300
3301 orf_header =
3302 (const struct bgp_route_refresh_orf *)(pptr + BGP_ROUTE_REFRESH_SIZE);
3303
3304 ND_PRINT("\n\t ORF refresh %s (%u), ORF type %s (%u), ORF length %u",
3305 tok2str(bgp_orf_refresh_type, "Unknown",
3306 GET_U_1(orf_header->refresh)),
3307 GET_U_1(orf_header->refresh),
3308 tok2str(bgp_orf_type, "Unknown", GET_U_1(orf_header->type)),
3309 GET_U_1(orf_header->type), GET_BE_U_2(orf_header->len));
3310 }
3311
3312 if (ndo->ndo_vflag > 1) {
3313 ND_TCHECK_LEN(pptr, len);
3314 print_unknown_data(ndo, pptr, "\n\t ", len);
3315 }
3316
3317 return;
3318 trunc:
3319 nd_print_trunc(ndo);
3320 }
3321
3322 static int
3323 bgp_pdu_print(netdissect_options *ndo,
3324 const u_char *dat, u_int length)
3325 {
3326 const struct bgp *bgp_header;
3327 uint8_t bgp_type;
3328
3329 ND_TCHECK_LEN(dat, BGP_SIZE);
3330 bgp_header = (const struct bgp *)dat;
3331 bgp_type = GET_U_1(bgp_header->bgp_type);
3332
3333 ND_PRINT("\n\t%s Message (%u), length: %u",
3334 tok2str(bgp_msg_values, "Unknown", bgp_type),
3335 bgp_type,
3336 length);
3337
3338 switch (bgp_type) {
3339 case BGP_OPEN:
3340 bgp_open_print(ndo, dat, length);
3341 break;
3342 case BGP_UPDATE:
3343 bgp_update_print(ndo, dat, length);
3344 break;
3345 case BGP_NOTIFICATION:
3346 bgp_notification_print(ndo, dat, length);
3347 break;
3348 case BGP_KEEPALIVE:
3349 break;
3350 case BGP_ROUTE_REFRESH:
3351 bgp_route_refresh_print(ndo, dat, length);
3352 break;
3353 default:
3354 /* we have no decoder for the BGP message */
3355 ND_TCHECK_LEN(dat, length);
3356 ND_PRINT("\n\t no Message %u decoder", bgp_type);
3357 print_unknown_data(ndo, dat, "\n\t ", length);
3358 break;
3359 }
3360 return 1;
3361 trunc:
3362 nd_print_trunc(ndo);
3363 return 0;
3364 }
3365
3366 void
3367 bgp_print(netdissect_options *ndo,
3368 const u_char *dat, u_int length _U_)
3369 {
3370 const u_char *p;
3371 const u_char *ep = ndo->ndo_snapend;
3372 const u_char *start;
3373 const u_char marker[] = {
3374 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3375 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3376 };
3377 const struct bgp *bgp_header;
3378 uint16_t hlen;
3379
3380 ndo->ndo_protocol = "bgp";
3381 ND_PRINT(": BGP");
3382
3383 if (ndo->ndo_vflag < 1) /* lets be less chatty */
3384 return;
3385
3386 p = dat;
3387 start = p;
3388 while (p < ep) {
3389 if (!ND_TTEST_1(p))
3390 break;
3391 if (GET_U_1(p) != 0xff) {
3392 p++;
3393 continue;
3394 }
3395
3396 if (!ND_TTEST_LEN(p, sizeof(marker)))
3397 break;
3398 if (memcmp(p, marker, sizeof(marker)) != 0) {
3399 p++;
3400 continue;
3401 }
3402
3403 /* found BGP header */
3404 ND_TCHECK_LEN(p, BGP_SIZE);
3405 bgp_header = (const struct bgp *)p;
3406
3407 if (start != p)
3408 nd_print_trunc(ndo);
3409
3410 hlen = GET_BE_U_2(bgp_header->bgp_len);
3411 if (hlen < BGP_SIZE) {
3412 ND_PRINT("\nmessage length %u < %u", hlen, BGP_SIZE);
3413 nd_print_invalid(ndo);
3414 break;
3415 }
3416
3417 if (ND_TTEST_LEN(p, hlen)) {
3418 if (!bgp_pdu_print(ndo, p, hlen))
3419 return;
3420 p += hlen;
3421 start = p;
3422 } else {
3423 ND_PRINT("\n[|BGP %s]",
3424 tok2str(bgp_msg_values,
3425 "Unknown Message Type",
3426 GET_U_1(bgp_header->bgp_type)));
3427 break;
3428 }
3429 }
3430
3431 return;
3432
3433 trunc:
3434 nd_print_trunc(ndo);
3435 }
[mirror] the TCPdump network dissector