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[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 #include <config.h>
38
39 #include "netdissect-stdinc.h"
40
41 #include <stdio.h>
42 #include <string.h>
43
44 #include "netdissect.h"
45 #include "addrtoname.h"
46 #include "extract.h"
47 #include "af.h"
48 #include "l2vpn.h"
49
50 struct bgp {
51 nd_byte bgp_marker[16];
52 nd_uint16_t bgp_len;
53 nd_uint8_t bgp_type;
54 };
55 #define BGP_SIZE 19 /* unaligned */
56
57 #define BGP_OPEN 1
58 #define BGP_UPDATE 2
59 #define BGP_NOTIFICATION 3
60 #define BGP_KEEPALIVE 4
61 #define BGP_ROUTE_REFRESH 5
62
63 static const struct tok bgp_msg_values[] = {
64 { BGP_OPEN, "Open"},
65 { BGP_UPDATE, "Update"},
66 { BGP_NOTIFICATION, "Notification"},
67 { BGP_KEEPALIVE, "Keepalive"},
68 { BGP_ROUTE_REFRESH, "Route Refresh"},
69 { 0, NULL}
70 };
71
72 struct bgp_open {
73 nd_byte bgpo_marker[16];
74 nd_uint16_t bgpo_len;
75 nd_uint8_t bgpo_type;
76 nd_uint8_t bgpo_version;
77 nd_uint16_t bgpo_myas;
78 nd_uint16_t bgpo_holdtime;
79 nd_uint32_t bgpo_id;
80 nd_uint8_t bgpo_optlen;
81 nd_uint8_t bgpo_opttype; /* RFC9072 */
82 nd_uint16_t bgpo_optlen_extended; /* RFC9072 */
83 /* options should follow */
84 };
85 #define BGP_OPEN_SIZE 29 /* unaligned */
86
87 struct bgp_opt {
88 nd_uint8_t bgpopt_type;
89 nd_uint16_t bgpopt_len; /* Can be one or two bytes, depending on RFC9072 */
90 /* variable length */
91 };
92 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
93 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
94
95 struct bgp_notification {
96 nd_byte bgpn_marker[16];
97 nd_uint16_t bgpn_len;
98 nd_uint8_t bgpn_type;
99 nd_uint8_t bgpn_major;
100 nd_uint8_t bgpn_minor;
101 };
102 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
103
104 struct bgp_route_refresh_orf {
105 nd_uint8_t refresh;
106 nd_uint8_t type;
107 nd_uint16_t len;
108 };
109
110 struct bgp_route_refresh {
111 nd_byte bgp_marker[16];
112 nd_uint16_t len;
113 nd_uint8_t type; /* No padding after this; afi is, in fact, not aligned */
114 nd_uint16_t afi;
115 nd_uint8_t subtype;
116 nd_uint8_t safi;
117 };
118
119 static const struct tok bgp_orf_refresh_type[] = {
120 { 1, "Immediate"},
121 { 2, "Defer"},
122 { 0, NULL }
123 };
124
125 static const struct tok bgp_orf_type[] = {
126 { 64, "Address Prefix ORF"},
127 { 65, "CP-ORF"},
128 { 0, NULL }
129 };
130
131 #define BGP_ROUTE_REFRESH_SIZE 23
132 #define BGP_ROUTE_REFRESH_SIZE_ORF BGP_ROUTE_REFRESH_SIZE + 5
133 #define BGP_ROUTE_REFRESH_SUBTYPE_NORMAL 0
134 #define BGP_ROUTE_REFRESH_SUBTYPE_BORR 1
135 #define BGP_ROUTE_REFRESH_SUBTYPE_EORR 2
136 #define BGP_ROUTE_REFRESH_SUBTYPE_RESERVED 255
137
138 static const struct tok bgp_route_refresh_subtype_values[] = {
139 {BGP_ROUTE_REFRESH_SUBTYPE_NORMAL, "Normal route refresh request"},
140 {BGP_ROUTE_REFRESH_SUBTYPE_BORR,
141 "Demarcation of the beginning of a route refresh"},
142 {BGP_ROUTE_REFRESH_SUBTYPE_EORR,
143 "Demarcation of the ending of a route refresh"},
144 {0, NULL}};
145
146 #define bgp_attr_lenlen(flags, p) \
147 (((flags) & 0x10) ? 2U : 1U)
148 #define bgp_attr_len(flags, p) \
149 (((flags) & 0x10) ? GET_BE_U_2(p) : GET_U_1(p))
150
151 #define BGPTYPE_ORIGIN 1
152 #define BGPTYPE_AS_PATH 2
153 #define BGPTYPE_NEXT_HOP 3
154 #define BGPTYPE_MULTI_EXIT_DISC 4
155 #define BGPTYPE_LOCAL_PREF 5
156 #define BGPTYPE_ATOMIC_AGGREGATE 6
157 #define BGPTYPE_AGGREGATOR 7
158 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
159 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */
160 #define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */
161 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */
162 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */
163 #define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */
164 #define BGPTYPE_AS4_PATH 17 /* RFC6793 */
165 #define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */
166 #define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */
167 #define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */
168 #define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */
169 #define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */
170 #define BGPTYPE_AIGP 26 /* RFC7311 */
171 #define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */
172 #define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */
173 #define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */
174 #define BGPTYPE_BGPSEC_PATH 33 /* RFC8205 */
175 #define BGPTYPE_OTC 35 /* RFC9234 */
176 #define BGPTYPE_ATTR_SET 128 /* RFC6368 */
177
178 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
179
180 static const struct tok bgp_attr_values[] = {
181 { BGPTYPE_ORIGIN, "Origin"},
182 { BGPTYPE_AS_PATH, "AS Path"},
183 { BGPTYPE_AS4_PATH, "AS4 Path"},
184 { BGPTYPE_NEXT_HOP, "Next Hop"},
185 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
186 { BGPTYPE_LOCAL_PREF, "Local Preference"},
187 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
188 { BGPTYPE_AGGREGATOR, "Aggregator"},
189 { BGPTYPE_AGGREGATOR4, "Aggregator4"},
190 { BGPTYPE_COMMUNITIES, "Community"},
191 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
192 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
193 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
194 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
195 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
196 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
197 { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"},
198 { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"},
199 { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
200 { BGPTYPE_AIGP, "Accumulated IGP Metric"},
201 { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
202 { BGPTYPE_ENTROPY_LABEL, "Entropy Label"},
203 { BGPTYPE_LARGE_COMMUNITY, "Large Community"},
204 { BGPTYPE_BGPSEC_PATH, "BGPsec Path"},
205 { BGPTYPE_OTC, "Only to Customer (OTC)"},
206 { BGPTYPE_ATTR_SET, "Attribute Set"},
207 { 255, "Reserved for development"},
208 { 0, NULL}
209 };
210
211 #define BGP_AS_SET 1
212 #define BGP_AS_SEQUENCE 2
213 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
214 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
215
216 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
217 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
218
219 static const struct tok bgp_as_path_segment_open_values[] = {
220 { BGP_AS_SEQUENCE, ""},
221 { BGP_AS_SET, "{ "},
222 { BGP_CONFED_AS_SEQUENCE, "( "},
223 { BGP_CONFED_AS_SET, "({ "},
224 { 0, NULL}
225 };
226
227 static const struct tok bgp_as_path_segment_close_values[] = {
228 { BGP_AS_SEQUENCE, ""},
229 { BGP_AS_SET, "}"},
230 { BGP_CONFED_AS_SEQUENCE, ")"},
231 { BGP_CONFED_AS_SET, "})"},
232 { 0, NULL}
233 };
234
235 #define BGP_OPT_AUTH 1
236 #define BGP_OPT_CAP 2
237
238 static const struct tok bgp_opt_values[] = {
239 { BGP_OPT_AUTH, "Authentication Information"},
240 { BGP_OPT_CAP, "Capabilities Advertisement"},
241 { 0, NULL}
242 };
243
244 #define BGP_CAPCODE_MP 1 /* RFC2858 */
245 #define BGP_CAPCODE_RR 2 /* RFC2918 */
246 #define BGP_CAPCODE_ORF 3 /* RFC5291 */
247 #define BGP_CAPCODE_MR 4 /* RFC3107 */
248 #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */
249 #define BGP_CAPCODE_EXT_MSG 6 /* RFC8654 */
250 #define BGP_CAPCODE_BGPSEC 7 /* RFC8205 */
251 #define BGP_CAPCODE_ML 8 /* RFC8277 */
252 #define BGP_CAPCODE_ROLE 9 /* RFC9234 */
253 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */
254 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
255 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
256 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
257 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
258 #define BGP_CAPCODE_ENH_RR 70 /* RFC7313 */
259 #define BGP_CAPCODE_LLGR 71 /* draft-uttaro-idr-bgp-persistence-05 */
260 #define BGP_CAPCODE_RR_CISCO 128
261
262 static const struct tok bgp_capcode_values[] = {
263 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
264 { BGP_CAPCODE_RR, "Route Refresh"},
265 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
266 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
267 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
268 { BGP_CAPCODE_EXT_MSG, "BGP Extended Message"},
269 { BGP_CAPCODE_BGPSEC, "BGPsec"},
270 { BGP_CAPCODE_ML, "Multiple Labels"},
271 { BGP_CAPCODE_RESTART, "Graceful Restart"},
272 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
273 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
274 { BGP_CAPCODE_MULTISESS, "Multisession BGP"},
275 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
276 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
277 { BGP_CAPCODE_LLGR, "Long-lived Graceful Restart"},
278 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
279 { BGP_CAPCODE_ROLE, "Role Capability"},
280 { 0, NULL}
281 };
282
283 #define BGP_NOTIFY_MAJOR_MSG 1
284 #define BGP_NOTIFY_MAJOR_OPEN 2
285 #define BGP_NOTIFY_MAJOR_UPDATE 3
286 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
287 #define BGP_NOTIFY_MAJOR_FSM 5
288 #define BGP_NOTIFY_MAJOR_CEASE 6
289 #define BGP_NOTIFY_MAJOR_ROUTEREFRESH 7
290 #define BGP_NOTIFY_MAJOR_SENDHOLDTIME 8
291
292 static const struct tok bgp_notify_major_values[] = {
293 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
294 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
295 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
296 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
297 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
298 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
299 { BGP_NOTIFY_MAJOR_ROUTEREFRESH, "ROUTE-REFRESH Message Error"},
300 { BGP_NOTIFY_MAJOR_SENDHOLDTIME, "Send Hold Timer Expired"},
301 { 0, NULL}
302 };
303
304 /* RFC 4486 */
305 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
306 /* RFC 9003 */
307 #define BGP_NOTIFY_MINOR_CEASE_SHUT 2
308 #define BGP_NOTIFY_MINOR_CEASE_RESET 4
309 /* RFC 8538 */
310 #define BGP_NOTIFY_MINOR_CEASE_HARDRESET 9
311 static const struct tok bgp_notify_minor_cease_values[] = {
312 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
313 { BGP_NOTIFY_MINOR_CEASE_SHUT, "Administrative Shutdown"},
314 { 3, "Peer Unconfigured"},
315 { BGP_NOTIFY_MINOR_CEASE_RESET, "Administrative Reset"},
316 { 5, "Connection Rejected"},
317 { 6, "Other Configuration Change"},
318 { 7, "Connection Collision Resolution"},
319 { 8, "Out of Resources"},
320 { BGP_NOTIFY_MINOR_CEASE_HARDRESET, "Hard Reset"},
321 { 10, "BFD Down"},
322 { 0, NULL}
323 };
324
325 static const struct tok bgp_notify_minor_msg_values[] = {
326 { 1, "Connection Not Synchronized"},
327 { 2, "Bad Message Length"},
328 { 3, "Bad Message Type"},
329 { 0, NULL}
330 };
331
332 static const struct tok bgp_notify_minor_open_values[] = {
333 { 1, "Unsupported Version Number"},
334 { 2, "Bad Peer AS"},
335 { 3, "Bad BGP Identifier"},
336 { 4, "Unsupported Optional Parameter"},
337 { 5, "Authentication Failure"},
338 { 6, "Unacceptable Hold Time"},
339 { 7, "Capability Message Error"},
340 { 0, NULL}
341 };
342
343 static const struct tok bgp_notify_minor_update_values[] = {
344 { 1, "Malformed Attribute List"},
345 { 2, "Unrecognized Well-known Attribute"},
346 { 3, "Missing Well-known Attribute"},
347 { 4, "Attribute Flags Error"},
348 { 5, "Attribute Length Error"},
349 { 6, "Invalid ORIGIN Attribute"},
350 { 7, "AS Routing Loop"},
351 { 8, "Invalid NEXT_HOP Attribute"},
352 { 9, "Optional Attribute Error"},
353 { 10, "Invalid Network Field"},
354 { 11, "Malformed AS_PATH"},
355 { 0, NULL}
356 };
357
358 static const struct tok bgp_notify_minor_fsm_values[] = {
359 { 0, "Unspecified Error"},
360 { 1, "In OpenSent State"},
361 { 2, "In OpenConfirm State"},
362 { 3, "In Established State"},
363 { 0, NULL }
364 };
365
366 static const struct tok bgp_notify_minor_routerefresh_values[] = {
367 { 1, "Invalid Message Length" },
368 { 0, NULL }
369 };
370
371 static const struct tok bgp_origin_values[] = {
372 { 0, "IGP"},
373 { 1, "EGP"},
374 { 2, "Incomplete"},
375 { 0, NULL}
376 };
377
378 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1
379 #define BGP_PMSI_TUNNEL_LDP_P2MP 2
380 #define BGP_PMSI_TUNNEL_PIM_SSM 3
381 #define BGP_PMSI_TUNNEL_PIM_SM 4
382 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5
383 #define BGP_PMSI_TUNNEL_INGRESS 6
384 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7
385
386 static const struct tok bgp_pmsi_tunnel_values[] = {
387 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
388 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
389 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
390 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
391 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
392 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
393 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
394 { 0, NULL}
395 };
396
397 static const struct tok bgp_pmsi_flag_values[] = {
398 { 0x01, "Leaf Information required"},
399 { 0, NULL}
400 };
401
402 #define BGP_AIGP_TLV 1
403
404 static const struct tok bgp_aigp_values[] = {
405 { BGP_AIGP_TLV, "AIGP"},
406 { 0, NULL}
407 };
408
409 #define BGP_ROLE_PROVIDER 0
410 #define BGP_ROLE_RS 1
411 #define BGP_ROLE_RS_CLIENT 2
412 #define BGP_ROLE_CUSTOMER 3
413 #define BGP_ROLE_PEER 4
414
415 static const struct tok bgp_role_values[] = {
416 { BGP_ROLE_PROVIDER, "Provider"},
417 { BGP_ROLE_RS, "RS"},
418 { BGP_ROLE_RS_CLIENT, "RS-Client"},
419 { BGP_ROLE_CUSTOMER, "Customer"},
420 { BGP_ROLE_PEER, "Peer"},
421 { 0, NULL}
422 };
423
424 /* Subsequent address family identifier, RFC2283 section 7 */
425 #define SAFNUM_RES 0
426 #define SAFNUM_UNICAST 1
427 #define SAFNUM_MULTICAST 2
428 #define SAFNUM_UNIMULTICAST 3 /* deprecated now */
429 /* labeled BGP RFC3107 */
430 #define SAFNUM_LABUNICAST 4
431 /* RFC6514 */
432 #define SAFNUM_MULTICAST_VPN 5
433 /* draft-nalawade-kapoor-tunnel-safi */
434 #define SAFNUM_TUNNEL 64
435 /* RFC4761 */
436 #define SAFNUM_VPLS 65
437 /* RFC6037 */
438 #define SAFNUM_MDT 66
439 /* RFC7432 */
440 #define SAFNUM_EVPN 70
441 /* RFC4364 */
442 #define SAFNUM_VPNUNICAST 128
443 /* RFC6513 */
444 #define SAFNUM_VPNMULTICAST 129
445 #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */
446 /* RFC4684 */
447 #define SAFNUM_RT_ROUTING_INFO 132
448
449 #define BGP_VPN_RD_LEN 8
450
451 static const struct tok bgp_safi_values[] = {
452 { SAFNUM_RES, "Reserved"},
453 { SAFNUM_UNICAST, "Unicast"},
454 { SAFNUM_MULTICAST, "Multicast"},
455 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
456 { SAFNUM_LABUNICAST, "labeled Unicast"},
457 { SAFNUM_TUNNEL, "Tunnel"},
458 { SAFNUM_VPLS, "VPLS"},
459 { SAFNUM_MDT, "MDT"},
460 { SAFNUM_EVPN, "EVPN"},
461 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
462 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
463 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
464 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
465 { SAFNUM_MULTICAST_VPN, "Multicast VPN"},
466 { 0, NULL }
467 };
468
469 static const struct tok bgp_graceful_restart_comm_flag_values[] = {
470 { 0x8, "R" },
471 { 0x4, "N" },
472 { 0, NULL }
473 };
474
475 /* well-known community */
476 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
477 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
478 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
479
480 /* Extended community type - RFC 4360 */
481 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
482 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
483 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
484 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
485 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
486 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
487 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
488 #define BGP_EXT_COM_OVS 0x4300 /* BGP Prefix Origin Validation State Extended Community */
489 /* rfc2547 bgp-mpls-vpns */
490 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
491 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatibility */
492 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatibility */
493 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatibility */
494
495 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
496 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatibility */
497 #define BGP_EXT_COM_ENCAP 0x030c /* rfc5512 */
498
499 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
500 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatibility */
501
502 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
503
504 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
505 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
506 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
507 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */
508
509 /* https://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */
510 #define BGP_EXT_COM_EIGRP_GEN 0x8800
511 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801
512 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
513 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803
514 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804
515 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
516
517 /* Optional Parameters */
518 #define BGP_OPEN_NON_EXT_OPT_TYPE_EXTENDED_LENGTH 255 /* Non-Ext OP Type */
519
520 static const struct tok bgp_extd_comm_flag_values[] = {
521 { 0x8000, "vendor-specific"},
522 { 0x4000, "non-transitive"},
523 { 0, NULL},
524 };
525
526 /* rfc8097 */
527 static const struct tok bgp_prefix_origin_validation_state[] = {
528 { 0, "valid" },
529 { 1, "not found" },
530 { 2, "invalid" },
531 { 0, NULL },
532 };
533
534 static const struct tok bgp_extd_comm_subtype_values[] = {
535 { BGP_EXT_COM_RT_0, "target"},
536 { BGP_EXT_COM_RT_1, "target"},
537 { BGP_EXT_COM_RT_2, "target"},
538 { BGP_EXT_COM_RO_0, "origin"},
539 { BGP_EXT_COM_RO_1, "origin"},
540 { BGP_EXT_COM_RO_2, "origin"},
541 { BGP_EXT_COM_LINKBAND, "link-BW"},
542 { BGP_EXT_COM_OVS, "origin-validation-state"},
543 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
544 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
545 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
546 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
547 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
548 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
549 { BGP_EXT_COM_ENCAP, "encapsulation"},
550 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
551 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
552 { BGP_EXT_COM_L2INFO, "layer2-info"},
553 { BGP_EXT_COM_EIGRP_GEN, "eigrp-general-route (flag, tag)" },
554 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY, "eigrp-route-metric (AS, delay)" },
555 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW, "eigrp-route-metric (reliability, nexthop, bandwidth)" },
556 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU, "eigrp-route-metric (load, MTU)" },
557 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID, "eigrp-external-route (remote-AS, remote-ID)" },
558 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC, "eigrp-external-route (remote-proto, remote-metric)" },
559 { BGP_EXT_COM_SOURCE_AS, "source-AS" },
560 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
561 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
562 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
563 { 0, NULL},
564 };
565
566 /* RFC RFC5512 BGP Tunnel Encapsulation Attribute Tunnel Types */
567 #define BGP_ENCAP_TUNNEL_L2TPV3_IP 1
568 #define BGP_ENCAP_TUNNEL_GRE 2
569 #define BGP_ENCAP_TUNNEL_TRANSMIT 3
570 #define BGP_ENCAP_TUNNEL_IPSEC 4
571 #define BGP_ENCAP_TUNNEL_IP_IPSEC 5
572 #define BGP_ENCAP_TUNNEL_MPLS_IP 6
573 #define BGP_ENCAP_TUNNEL_IP_IP 7
574 #define BGP_ENCAP_TUNNEL_VXLAN 8
575 #define BGP_ENCAP_TUNNEL_NVGRE 9
576 #define BGP_ENCAP_TUNNEL_MPLS 10
577 #define BGP_ENCAP_TUNNEL_MPLS_GRE 11
578 #define BGP_ENCAP_TUNNEL_VXLAN_GPE 12
579 #define BGP_ENCAP_TUNNEL_MPLS_UDP 13
580 #define BGP_ENCAP_TUNNEL_IPV6 14
581 #define BGP_ENCAP_TUNNEL_SR_TE 15
582 #define BGP_ENCAP_TUNNEL_BARE 16
583 #define BGP_ENCAP_TUNNEL_SR 17
584
585 static const struct tok bgp_extd_comm_encap_tunnel_values[] = {
586 { BGP_ENCAP_TUNNEL_L2TPV3_IP, "L2TPv3 over IP"},
587 { BGP_ENCAP_TUNNEL_GRE, "GRE"},
588 { BGP_ENCAP_TUNNEL_TRANSMIT, "Transmit Tunnel"},
589 { BGP_ENCAP_TUNNEL_IPSEC, "IPsec"},
590 { BGP_ENCAP_TUNNEL_IP_IPSEC, "IP in IP with IPsec"},
591 { BGP_ENCAP_TUNNEL_MPLS_IP, "MPLS in IP with IPsec"},
592 { BGP_ENCAP_TUNNEL_IP_IP, "IP in IP"},
593 { BGP_ENCAP_TUNNEL_VXLAN, "VXLAN"},
594 { BGP_ENCAP_TUNNEL_NVGRE, "NVGRE"},
595 { BGP_ENCAP_TUNNEL_MPLS, "MPLS"},
596 { BGP_ENCAP_TUNNEL_MPLS_GRE, "MPLS in GRE"},
597 { BGP_ENCAP_TUNNEL_VXLAN_GPE, "VXLAN GPE"},
598 { BGP_ENCAP_TUNNEL_MPLS_UDP, "MPLS in UDP"},
599 { BGP_ENCAP_TUNNEL_IPV6, "IPv6"},
600 { BGP_ENCAP_TUNNEL_SR_TE, "SR TE"},
601 { BGP_ENCAP_TUNNEL_BARE, "Bare"},
602 { BGP_ENCAP_TUNNEL_SR, "SR"},
603 { 0, NULL},
604 };
605
606 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
607 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
608 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
609 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
610 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
611 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
612 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
613 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
614
615 static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
616 { BGP_OSPF_RTYPE_RTR, "Router" },
617 { BGP_OSPF_RTYPE_NET, "Network" },
618 { BGP_OSPF_RTYPE_SUM, "Summary" },
619 { BGP_OSPF_RTYPE_EXT, "External" },
620 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
621 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
622 { 0, NULL },
623 };
624
625 /* ADD-PATH Send/Receive field values */
626 static const struct tok bgp_add_path_recvsend[] = {
627 { 1, "Receive" },
628 { 2, "Send" },
629 { 3, "Both" },
630 { 0, NULL },
631 };
632
633 static const struct tok bgp_bgpsec_bitmap_str[] = {
634 { 1U << 0, "MBZ-0" },
635 { 1U << 1, "MBZ-1" },
636 { 1U << 2, "MBZ-2" },
637 { 1U << 3, "MBZ-3" },
638 { 1U << 4, "MBZ-4" },
639 { 1U << 5, "MBZ-5" },
640 { 1U << 6, "MBZ-6" },
641 { 1U << 7, "C" },
642 { 0, NULL}
643 };
644
645 #define AS_STR_SIZE sizeof("xxxxx.xxxxx")
646
647 /*
648 * as_printf
649 *
650 * Convert an AS number into a string and return string pointer.
651 *
652 * Depending on bflag is set or not, AS number is converted into ASDOT notation
653 * or plain number notation.
654 *
655 */
656 static char *
657 as_printf(netdissect_options *ndo,
658 char *str, size_t size, u_int asnum)
659 {
660 if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
661 snprintf(str, size, "%u", asnum);
662 } else {
663 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
664 }
665 return str;
666 }
667
668 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
669
670 int
671 decode_prefix4(netdissect_options *ndo,
672 const u_char *pptr, u_int itemlen, char *buf, size_t buflen)
673 {
674 nd_ipv4 addr;
675 u_int plen, plenbytes;
676
677 ITEMCHECK(1);
678 plen = GET_U_1(pptr);
679 if (32 < plen)
680 return -1;
681 itemlen -= 1;
682
683 memset(&addr, 0, sizeof(addr));
684 plenbytes = (plen + 7) / 8;
685 ITEMCHECK(plenbytes);
686 GET_CPY_BYTES(&addr, pptr + 1, plenbytes);
687 if (plen % 8) {
688 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
689 }
690 snprintf(buf, buflen, "%s/%u", ipaddr_string(ndo, (const u_char *)&addr), plen);
691 return 1 + plenbytes;
692
693 badtlv:
694 return -2;
695 }
696
697 static int
698 print_labeled_prefix4(netdissect_options *ndo,
699 const u_char *pptr, u_int itemlen)
700 {
701 nd_ipv4 addr;
702 u_int plen, plenbytes;
703
704 /* prefix length and label = 4 bytes */
705 ND_TCHECK_4(pptr);
706 ITEMCHECK(4);
707 plen = GET_U_1(pptr); /* get prefix length */
708
709 /* this is one of the weirdnesses of rfc3107
710 the label length (actually the label + COS bits)
711 is added to the prefix length;
712 we also do only read out just one label -
713 there is no real application for advertisement of
714 stacked labels in a single BGP message
715 */
716
717 if (24 > plen)
718 goto badplen;
719
720 plen-=24; /* adjust prefixlen - labellength */
721
722 if (32 < plen)
723 goto badplen;
724 itemlen -= 4;
725
726 memset(&addr, 0, sizeof(addr));
727 plenbytes = (plen + 7) / 8;
728 ITEMCHECK(plenbytes);
729 GET_CPY_BYTES(&addr, pptr + 4, plenbytes);
730 if (plen % 8) {
731 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
732 }
733 /* the label may get offsetted by 4 bits so lets shift it right */
734 ND_PRINT("\n\t %s/%u, label:%u %s",
735 ipaddr_string(ndo, (const u_char *)&addr),
736 plen,
737 GET_BE_U_3(pptr + 1)>>4,
738 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
739
740 return 4 + plenbytes;
741
742 badplen:
743 ND_PRINT("\n\t (illegal prefix length)");
744 return -1;
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, const u_char *pptr)
804 {
805 uint8_t addr_length;
806 u_int total_length;
807
808 total_length = 0;
809
810 /* Source address length, encoded in bits */
811 addr_length = GET_U_1(pptr);
812 pptr++;
813
814 /* Source address */
815 ND_TCHECK_LEN(pptr, (addr_length >> 3));
816 total_length += (addr_length >> 3) + 1;
817 if (addr_length) {
818 ND_PRINT(", Source %s",
819 bgp_vpn_ip_print(ndo, pptr, addr_length));
820 pptr += (addr_length >> 3);
821 }
822
823 /* Group address length, encoded in bits */
824 addr_length = GET_U_1(pptr);
825 pptr++;
826
827 /* Group address */
828 ND_TCHECK_LEN(pptr, (addr_length >> 3));
829 total_length += (addr_length >> 3) + 1;
830 if (addr_length) {
831 ND_PRINT(", Group %s",
832 bgp_vpn_ip_print(ndo, pptr, addr_length));
833 pptr += (addr_length >> 3);
834 }
835
836 trunc:
837 return (total_length);
838 }
839
840 /* Print an RFC 4364 Route Distinguisher */
841 const char *
842 bgp_vpn_rd_print(netdissect_options *ndo, const u_char *pptr)
843 {
844 /* allocate space for the largest possible string */
845 static char rd[sizeof("xxxxx.xxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
846 char *pos = rd;
847 /* allocate space for the largest possible string */
848 char astostr[AS_STR_SIZE];
849
850 /* ok lets load the RD format */
851 switch (GET_BE_U_2(pptr)) {
852
853 case 0:
854 /* 2-byte-AS:number fmt */
855 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
856 GET_BE_U_2(pptr + 2),
857 GET_BE_U_4(pptr + 4),
858 GET_U_1(pptr + 4), GET_U_1(pptr + 5),
859 GET_U_1(pptr + 6), GET_U_1(pptr + 7));
860 break;
861
862 case 1:
863 /* IP-address:AS fmt */
864 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
865 GET_U_1(pptr + 2), GET_U_1(pptr + 3),
866 GET_U_1(pptr + 4), GET_U_1(pptr + 5),
867 GET_BE_U_2(pptr + 6));
868 break;
869
870 case 2:
871 /* 4-byte-AS:number fmt */
872 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
873 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 2)),
874 GET_BE_U_2(pptr + 6), GET_U_1(pptr + 2),
875 GET_U_1(pptr + 3), GET_U_1(pptr + 4),
876 GET_U_1(pptr + 5), GET_BE_U_2(pptr + 6));
877 break;
878 default:
879 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
880 break;
881 }
882 pos += strlen(pos);
883 *(pos) = '\0';
884 return (rd);
885 }
886
887 /*
888 * Print an RFC 4360 Extended Community.
889 */
890 static void
891 bgp_extended_community_print(netdissect_options *ndo,
892 const u_char *pptr)
893 {
894 /* allocate space for the largest possible string */
895 char astostr[AS_STR_SIZE];
896
897 switch (GET_BE_U_2(pptr)) {
898
899 case BGP_EXT_COM_RT_0:
900 case BGP_EXT_COM_RO_0:
901 case BGP_EXT_COM_L2VPN_RT_0:
902 ND_PRINT("%u:%u (= %s)",
903 GET_BE_U_2(pptr + 2),
904 GET_BE_U_4(pptr + 4),
905 GET_IPADDR_STRING(pptr+4));
906 break;
907
908 case BGP_EXT_COM_RT_1:
909 case BGP_EXT_COM_RO_1:
910 case BGP_EXT_COM_L2VPN_RT_1:
911 case BGP_EXT_COM_VRF_RT_IMP:
912 ND_PRINT("%s:%u",
913 GET_IPADDR_STRING(pptr+2),
914 GET_BE_U_2(pptr + 6));
915 break;
916
917 case BGP_EXT_COM_RT_2:
918 case BGP_EXT_COM_RO_2:
919 ND_PRINT("%s:%u",
920 as_printf(ndo, astostr, sizeof(astostr),
921 GET_BE_U_4(pptr + 2)), GET_BE_U_2(pptr + 6));
922 break;
923
924 case BGP_EXT_COM_LINKBAND:
925 ND_PRINT("bandwidth: %.3f Mbps",
926 GET_BE_F_4(pptr + 4)*8/1000000);
927 break;
928
929 case BGP_EXT_COM_OVS:
930 /* The Reserved field MUST be set to 0 and ignored upon the
931 * receipt of this community.
932 */
933 {
934 uint64_t reserved = GET_BE_U_5(pptr + 2);
935
936 if (reserved)
937 ND_PRINT("[the reserved field 0x%" PRIx64 " MUST be 0] ",
938 reserved);
939 ND_PRINT("ovs: %s",
940 tok2str(bgp_prefix_origin_validation_state,
941 "unknown origin validation state",
942 GET_U_1(pptr + 7)));
943 }
944 break;
945
946 case BGP_EXT_COM_VPN_ORIGIN:
947 case BGP_EXT_COM_VPN_ORIGIN2:
948 case BGP_EXT_COM_VPN_ORIGIN3:
949 case BGP_EXT_COM_VPN_ORIGIN4:
950 case BGP_EXT_COM_OSPF_RID:
951 case BGP_EXT_COM_OSPF_RID2:
952 ND_PRINT("%s", GET_IPADDR_STRING(pptr+2));
953 break;
954
955 case BGP_EXT_COM_OSPF_RTYPE:
956 case BGP_EXT_COM_OSPF_RTYPE2:
957 ND_PRINT("area:%s, router-type:%s, metric-type:%s%s",
958 GET_IPADDR_STRING(pptr+2),
959 tok2str(bgp_extd_comm_ospf_rtype_values,
960 "unknown (0x%02x)",
961 GET_U_1((pptr + 6))),
962 (GET_U_1(pptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
963 ((GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_EXT) || (GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "");
964 break;
965
966 case BGP_EXT_COM_L2INFO:
967 ND_PRINT("%s Control Flags [0x%02x]:MTU %u",
968 tok2str(l2vpn_encaps_values,
969 "unknown encaps",
970 GET_U_1((pptr + 2))),
971 GET_U_1((pptr + 3)),
972 GET_BE_U_2(pptr + 4));
973 break;
974
975 case BGP_EXT_COM_SOURCE_AS:
976 ND_PRINT("AS %u", GET_BE_U_2(pptr + 2));
977 break;
978
979 case BGP_EXT_COM_ENCAP:
980 ND_PRINT("Tunnel type: %s", tok2str(bgp_extd_comm_encap_tunnel_values,
981 "unknown encaps",
982 GET_BE_U_2(pptr + 6)));
983 break;
984
985 default:
986 ND_PRINT("%02x%02x%02x%02x%02x%02x",
987 GET_U_1(pptr + 2),
988 GET_U_1(pptr + 3),
989 GET_U_1(pptr + 4),
990 GET_U_1(pptr + 5),
991 GET_U_1(pptr + 6),
992 GET_U_1(pptr + 7));
993 break;
994 }
995 }
996
997 /*
998 * RFC4684 (Section 4)/RFC2858 (Section 4).
999 * RTC membership prefix is structured as follows
1000 * [prefix-len] [origin-as] [route-target]
1001 * The route-target is encoded as RT ext-comms.
1002 * Prefix-len may be 0, 32..96
1003 *
1004 * Note that pptr is not packet data - it is
1005 * a buffer owned by our caller - therefore GET_*
1006 * macros can not be used.
1007 */
1008 static char *
1009 bgp_rt_prefix_print(netdissect_options *ndo,
1010 const u_char *pptr,
1011 u_int plen)
1012 {
1013 /* allocate space for the largest possible string */
1014 char rtc_prefix_in_hex[sizeof("0000 0000 0000 0000")] = "";
1015 u_int rtc_prefix_in_hex_len = 0;
1016 static char output[61]; /* max response string */
1017 /* allocate space for the largest possible string */
1018 char astostr[AS_STR_SIZE];
1019 uint16_t ec_type = 0;
1020 u_int octet_count;
1021 u_int i;
1022
1023 if (plen == 0) {
1024 snprintf(output, sizeof(output), "route-target: 0:0/0");
1025 return (output);
1026 }
1027
1028 /* hex representation of the prefix */
1029 octet_count = (plen+7)/8;
1030 for (i=0; i<octet_count; i++) {
1031 rtc_prefix_in_hex_len += snprintf(rtc_prefix_in_hex+rtc_prefix_in_hex_len,
1032 sizeof(rtc_prefix_in_hex)-rtc_prefix_in_hex_len,
1033 "%02x%s", *(pptr+i),
1034 ((i%2 == 1) && (i<octet_count-1)) ? " " : "");
1035 }
1036
1037 if (plen < 16) {
1038 /*
1039 * The prefix is too short to include the full ext-comm type,
1040 * so we have no way to parse it further.
1041 */
1042 snprintf(output, sizeof(output), "route-target: partial-type: (%s/%d)",
1043 rtc_prefix_in_hex, plen);
1044 return (output);
1045 }
1046
1047 /*
1048 * get the ext-comm type
1049 * Note: pptr references a static 8 octet buffer with unused bits set to 0,
1050 * hence EXTRACT_*() macros are safe.
1051 */
1052 ec_type = EXTRACT_BE_U_2(pptr);
1053 switch (ec_type) {
1054 case BGP_EXT_COM_RT_0:
1055 /* 2-byte-AS:number fmt */
1056 snprintf(output, sizeof(output), "route-target: %u:%u/%d (%s)",
1057 EXTRACT_BE_U_2(pptr+2),
1058 EXTRACT_BE_U_4(pptr+4),
1059 plen, rtc_prefix_in_hex);
1060 break;
1061
1062 case BGP_EXT_COM_RT_1:
1063 /* IP-address:AS fmt */
1064 snprintf(output, sizeof(output), "route-target: %u.%u.%u.%u:%u/%d (%s)",
1065 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5),
1066 EXTRACT_BE_U_2(pptr+6), plen, rtc_prefix_in_hex);
1067 break;
1068
1069 case BGP_EXT_COM_RT_2:
1070 /* 4-byte-AS:number fmt */
1071 snprintf(output, sizeof(output), "route-target: %s:%u/%d (%s)",
1072 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(pptr+2)),
1073 EXTRACT_BE_U_2(pptr+6), plen, rtc_prefix_in_hex);
1074 break;
1075
1076 default:
1077 snprintf(output, sizeof(output), "route target: unknown-type(%04x) (%s/%d)",
1078 ec_type,
1079 rtc_prefix_in_hex, plen);
1080 break;
1081 }
1082 return (output);
1083 }
1084
1085 /* RFC 4684 */
1086 static int
1087 print_rt_routing_info(netdissect_options *ndo, const u_char *pptr)
1088 {
1089 uint8_t route_target[8];
1090 u_int plen;
1091 /* allocate space for the largest possible string */
1092 char astostr[AS_STR_SIZE];
1093 u_int num_octets;
1094
1095 /* NLRI "prefix length" from RFC 2858 Section 4. */
1096 plen = GET_U_1(pptr); /* get prefix length */
1097
1098 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
1099 * RFC 4684 Section 4 defines the layout of "origin AS" and "route
1100 * target" fields inside the "prefix" depending on its length.
1101 */
1102 if (0 == plen) {
1103 /* Without "origin AS", without "route target". */
1104 ND_PRINT("\n\t default route target");
1105 return 1;
1106 }
1107
1108 if (32 > plen) {
1109 ND_PRINT("\n\t (illegal prefix length)");
1110 return -1;
1111 }
1112
1113 /* With at least "origin AS", possibly with "route target". */
1114 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 1));
1115
1116 plen -= 32; /* adjust prefix length */
1117
1118 if (64 < plen) {
1119 ND_PRINT("\n\t (illegal prefix length)");
1120 return -1;
1121 }
1122
1123 /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 }
1124 * and gives the number of octets in the variable-length "route
1125 * target" field inside this NLRI "prefix". Look for it.
1126 */
1127 memset(&route_target, 0, sizeof(route_target));
1128 num_octets = (plen + 7) / 8;
1129 GET_CPY_BYTES(&route_target, pptr + 5, num_octets);
1130 /* If mask-len is not on octet boundary, ensure all extra bits are 0 */
1131 if (plen % 8) {
1132 ((u_char *)&route_target)[num_octets - 1] &=
1133 ((0xff00 >> (plen % 8)) & 0xff);
1134 }
1135 ND_PRINT("\n\t origin AS: %s, %s",
1136 astostr,
1137 bgp_rt_prefix_print(ndo, (u_char *)&route_target, plen));
1138
1139 return 5 + num_octets;
1140 }
1141
1142 static int
1143 print_labeled_vpn_prefix4(netdissect_options *ndo, const u_char *pptr)
1144 {
1145 nd_ipv4 addr;
1146 u_int plen;
1147
1148 plen = GET_U_1(pptr); /* get prefix length */
1149
1150 if ((24+64) > plen)
1151 goto badplen;
1152
1153 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1154
1155 if (32 < plen)
1156 goto badplen;
1157
1158 memset(&addr, 0, sizeof(addr));
1159 GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
1160 if (plen % 8) {
1161 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
1162 ((0xff00 >> (plen % 8)) & 0xff);
1163 }
1164 /* the label may get offsetted by 4 bits so lets shift it right */
1165 ND_PRINT("\n\t RD: %s, %s/%u, label:%u %s",
1166 bgp_vpn_rd_print(ndo, pptr+4),
1167 ipaddr_string(ndo, (const u_char *)&addr),
1168 plen,
1169 GET_BE_U_3(pptr + 1)>>4,
1170 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1171
1172 return 12 + (plen + 7) / 8;
1173
1174 badplen:
1175 ND_PRINT("\n\t (illegal prefix length)");
1176 return -1;
1177 }
1178
1179 /*
1180 * +-------------------------------+
1181 * | |
1182 * | RD:IPv4-address (12 octets) |
1183 * | |
1184 * +-------------------------------+
1185 * | MDT Group-address (4 octets) |
1186 * +-------------------------------+
1187 */
1188
1189 #define MDT_VPN_NLRI_LEN 16
1190
1191 static int
1192 print_mdt_vpn_nlri(netdissect_options *ndo, const u_char *pptr)
1193 {
1194 const u_char *rd;
1195 const u_char *vpn_ip;
1196
1197 /* if the NLRI is not predefined length, quit.*/
1198 if (GET_U_1(pptr) != MDT_VPN_NLRI_LEN * 8) {
1199 ND_PRINT("\n\t (illegal prefix length)");
1200 return -1;
1201 }
1202 pptr++;
1203
1204 /* RD */
1205 ND_TCHECK_8(pptr);
1206 rd = pptr;
1207 pptr += 8;
1208
1209 /* IPv4 address */
1210 vpn_ip = pptr;
1211 pptr += sizeof(nd_ipv4);
1212
1213 /* MDT Group Address */
1214 ND_PRINT("\n\t RD: %s, VPN IP Address: %s, MC Group Address: %s",
1215 bgp_vpn_rd_print(ndo, rd),
1216 GET_IPADDR_STRING(vpn_ip),
1217 GET_IPADDR_STRING(pptr));
1218
1219 return MDT_VPN_NLRI_LEN + 1;
1220
1221 trunc:
1222 return -2;
1223 }
1224
1225 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
1226 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
1227 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
1228 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
1229 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
1230 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
1231 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
1232
1233 static const struct tok bgp_multicast_vpn_route_type_values[] = {
1234 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
1235 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
1236 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
1237 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
1238 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
1239 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
1240 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
1241 { 0, NULL}
1242 };
1243
1244 static int
1245 print_multicast_vpn(netdissect_options *ndo, const u_char *pptr)
1246 {
1247 /* allocate space for the largest possible string */
1248 char astostr[AS_STR_SIZE];
1249 uint8_t route_type, route_length;
1250 u_int addr_length, sg_length;
1251
1252 route_type = GET_U_1(pptr);
1253 pptr++;
1254 route_length = GET_U_1(pptr);
1255 pptr++;
1256
1257 ND_PRINT("\n\t Route-Type: %s (%u), length: %u",
1258 tok2str(bgp_multicast_vpn_route_type_values,
1259 "Unknown", route_type),
1260 route_type, route_length);
1261
1262 switch(route_type) {
1263 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
1264 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1265 if (route_length < BGP_VPN_RD_LEN)
1266 goto trunc;
1267 ND_PRINT(", RD: %s, Originator %s",
1268 bgp_vpn_rd_print(ndo, pptr),
1269 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
1270 (route_length - BGP_VPN_RD_LEN) << 3));
1271 break;
1272 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
1273 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1274 ND_PRINT(", RD: %s, Source-AS %s",
1275 bgp_vpn_rd_print(ndo, pptr),
1276 as_printf(ndo, astostr, sizeof(astostr),
1277 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1278 break;
1279
1280 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
1281 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1282 ND_PRINT(", RD: %s", bgp_vpn_rd_print(ndo, pptr));
1283 pptr += BGP_VPN_RD_LEN;
1284
1285 sg_length = bgp_vpn_sg_print(ndo, pptr);
1286 addr_length = route_length - sg_length;
1287
1288 ND_TCHECK_LEN(pptr, addr_length);
1289 ND_PRINT(", Originator %s",
1290 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
1291 break;
1292
1293 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
1294 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1295 ND_PRINT(", RD: %s", bgp_vpn_rd_print(ndo, pptr));
1296 pptr += BGP_VPN_RD_LEN;
1297
1298 bgp_vpn_sg_print(ndo, pptr);
1299 break;
1300
1301 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
1302 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
1303 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1304 ND_PRINT(", RD: %s, Source-AS %s",
1305 bgp_vpn_rd_print(ndo, pptr),
1306 as_printf(ndo, astostr, sizeof(astostr),
1307 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1308 pptr += BGP_VPN_RD_LEN + 4;
1309
1310 bgp_vpn_sg_print(ndo, pptr);
1311 break;
1312
1313 /*
1314 * no per route-type printing yet.
1315 */
1316 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
1317 default:
1318 break;
1319 }
1320
1321 return route_length + 2;
1322
1323 trunc:
1324 return -2;
1325 }
1326
1327 static int
1328 print_labeled_vpn_l2(netdissect_options *ndo, const u_char *pptr)
1329 {
1330 u_int plen, tlen, tlv_type, tlv_len, ttlv_len;
1331
1332 plen = GET_BE_U_2(pptr);
1333 tlen = plen;
1334 pptr += 2;
1335 /* Old and new L2VPN NLRI share AFI/SAFI
1336 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1337 * and > 17 as old format. Complain for the middle case
1338 */
1339 if (plen == 12) {
1340 /* assume AD-only with RD, BGPNH */
1341 ND_TCHECK_LEN(pptr, 12);
1342 ND_PRINT("\n\t RD: %s, BGPNH: %s",
1343 bgp_vpn_rd_print(ndo, pptr),
1344 GET_IPADDR_STRING(pptr+8));
1345 return plen + 2;
1346 } else if (plen > 17) {
1347 /* assume old format */
1348 /* RD, ID, LBLKOFF, LBLBASE */
1349
1350 ND_TCHECK_LEN(pptr, 15);
1351 ND_PRINT("\n\t RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1352 bgp_vpn_rd_print(ndo, pptr),
1353 GET_BE_U_2(pptr + 8),
1354 GET_BE_U_2(pptr + 10),
1355 GET_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1356 pptr += 15;
1357 tlen -= 15;
1358
1359 /* ok now the variable part - lets read out TLVs*/
1360 while (tlen != 0) {
1361 if (tlen < 3) {
1362 ND_PRINT("\n\t\tran past the end");
1363 return plen + 2;
1364 }
1365 tlv_type = GET_U_1(pptr);
1366 pptr++;
1367 tlv_len = GET_BE_U_2(pptr); /* length, in *bits* */
1368 ttlv_len = (tlv_len + 7)/8; /* length, in *bytes* */
1369 pptr += 2;
1370
1371 switch(tlv_type) {
1372 case 1:
1373 ND_PRINT("\n\t\tcircuit status vector (%u) length: %u: 0x",
1374 tlv_type,
1375 tlv_len);
1376 while (ttlv_len != 0) {
1377 if (tlen < 1) {
1378 ND_PRINT(" (ran past the end)");
1379 return plen + 2;
1380 }
1381 ND_TCHECK_1(pptr);
1382 ND_PRINT("%02x", GET_U_1(pptr));
1383 pptr++;
1384 ttlv_len--;
1385 tlen--;
1386 }
1387 break;
1388 default:
1389 ND_PRINT("\n\t\tunknown TLV #%u, length: %u",
1390 tlv_type,
1391 tlv_len);
1392 if (tlen < ttlv_len) {
1393 ND_PRINT(" (ran past the end)");
1394 return plen + 2;
1395 }
1396 tlen -= ttlv_len;
1397 break;
1398 }
1399 }
1400 return plen + 2;
1401 } else {
1402 /* complain bitterly ? */
1403 /* fall through */
1404 goto trunc;
1405 }
1406
1407 trunc:
1408 return -2;
1409 }
1410
1411 int
1412 decode_prefix6(netdissect_options *ndo,
1413 const u_char *pd, u_int itemlen, char *buf, size_t buflen)
1414 {
1415 nd_ipv6 addr;
1416 u_int plen, plenbytes;
1417
1418 ITEMCHECK(1);
1419 plen = GET_U_1(pd);
1420 if (128 < plen)
1421 return -1;
1422 itemlen -= 1;
1423
1424 memset(&addr, 0, sizeof(addr));
1425 plenbytes = (plen + 7) / 8;
1426 ITEMCHECK(plenbytes);
1427 GET_CPY_BYTES(&addr, pd + 1, plenbytes);
1428 if (plen % 8) {
1429 addr[plenbytes - 1] &=
1430 ((0xff00 >> (plen % 8)) & 0xff);
1431 }
1432 snprintf(buf, buflen, "%s/%u", ip6addr_string(ndo, (const u_char *)&addr), plen);
1433 return 1 + plenbytes;
1434
1435 badtlv:
1436 return -2;
1437 }
1438
1439 static int
1440 print_labeled_prefix6(netdissect_options *ndo,
1441 const u_char *pptr, u_int itemlen)
1442 {
1443 nd_ipv6 addr;
1444 u_int plen, plenbytes;
1445
1446 /* prefix length and label = 4 bytes */
1447 ND_TCHECK_4(pptr);
1448 ITEMCHECK(4);
1449 plen = GET_U_1(pptr); /* get prefix length */
1450
1451 if (24 > plen)
1452 goto badplen;
1453
1454 plen -= 24; /* adjust prefixlen - labellength */
1455
1456 if (128 < plen)
1457 goto badplen;
1458 itemlen -= 4;
1459
1460 memset(&addr, 0, sizeof(addr));
1461 plenbytes = (plen + 7) / 8;
1462 GET_CPY_BYTES(&addr, pptr + 4, plenbytes);
1463 if (plen % 8) {
1464 addr[plenbytes - 1] &=
1465 ((0xff00 >> (plen % 8)) & 0xff);
1466 }
1467 /* the label may get offsetted by 4 bits so lets shift it right */
1468 ND_PRINT("\n\t %s/%u, label:%u %s",
1469 ip6addr_string(ndo, (const u_char *)&addr),
1470 plen,
1471 GET_BE_U_3(pptr + 1)>>4,
1472 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1473
1474 return 4 + plenbytes;
1475
1476 badplen:
1477 ND_PRINT("\n\t (illegal prefix length)");
1478 return -1;
1479
1480 trunc:
1481 return -2;
1482
1483 badtlv:
1484 return -3;
1485 }
1486
1487 static int
1488 print_labeled_vpn_prefix6(netdissect_options *ndo, const u_char *pptr)
1489 {
1490 nd_ipv6 addr;
1491 u_int plen;
1492
1493 plen = GET_U_1(pptr); /* get prefix length */
1494
1495 if ((24+64) > plen)
1496 goto badplen;
1497
1498 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1499
1500 if (128 < plen)
1501 goto badplen;
1502
1503 memset(&addr, 0, sizeof(addr));
1504 GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
1505 if (plen % 8) {
1506 addr[(plen + 7) / 8 - 1] &=
1507 ((0xff00 >> (plen % 8)) & 0xff);
1508 }
1509 /* the label may get offsetted by 4 bits so lets shift it right */
1510 ND_PRINT("\n\t RD: %s, %s/%u, label:%u %s",
1511 bgp_vpn_rd_print(ndo, pptr+4),
1512 ip6addr_string(ndo, (const u_char *)&addr),
1513 plen,
1514 GET_BE_U_3(pptr + 1)>>4,
1515 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1516
1517 return 12 + (plen + 7) / 8;
1518
1519 badplen:
1520 ND_PRINT("\n\t (illegal prefix length)");
1521 return -1;
1522 }
1523
1524 static int
1525 print_clnp_prefix(netdissect_options *ndo, const u_char *pptr)
1526 {
1527 uint8_t addr[19];
1528 u_int plen;
1529
1530 plen = GET_U_1(pptr); /* get prefix length */
1531
1532 if (152 < plen)
1533 goto badplen;
1534
1535 memset(&addr, 0, sizeof(addr));
1536 GET_CPY_BYTES(&addr, pptr + 4, (plen + 7) / 8);
1537 if (plen % 8) {
1538 addr[(plen + 7) / 8 - 1] &=
1539 ((0xff00 >> (plen % 8)) & 0xff);
1540 }
1541 /* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */
1542 ND_PRINT("\n\t %s/%u",
1543 isonsap_string(ndo, addr,(plen + 7) / 8),
1544 plen);
1545
1546 return 1 + (plen + 7) / 8;
1547
1548 badplen:
1549 ND_PRINT("\n\t (illegal prefix length)");
1550 return -1;
1551 }
1552
1553 static int
1554 print_labeled_vpn_clnp_prefix(netdissect_options *ndo, const u_char *pptr)
1555 {
1556 uint8_t addr[19];
1557 u_int plen;
1558
1559 plen = GET_U_1(pptr); /* get prefix length */
1560
1561 if ((24+64) > plen)
1562 goto badplen;
1563
1564 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1565
1566 if (152 < plen)
1567 goto badplen;
1568
1569 memset(&addr, 0, sizeof(addr));
1570 GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
1571 if (plen % 8) {
1572 addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
1573 }
1574 /* the label may get offsetted by 4 bits so lets shift it right */
1575 /* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */
1576 ND_PRINT("\n\t RD: %s, %s/%u, label:%u %s",
1577 bgp_vpn_rd_print(ndo, pptr+4),
1578 isonsap_string(ndo, addr,(plen + 7) / 8),
1579 plen,
1580 GET_BE_U_3(pptr + 1)>>4,
1581 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1582
1583 return 12 + (plen + 7) / 8;
1584
1585 badplen:
1586 ND_PRINT("\n\t (illegal prefix length)");
1587 return -1;
1588 }
1589
1590 /*
1591 * bgp_attr_get_as_size
1592 *
1593 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1594 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1595 * support, exchange AS-Path with the same path-attribute type value 0x02.
1596 */
1597 static u_int
1598 bgp_attr_get_as_size(netdissect_options *ndo,
1599 uint8_t bgpa_type, const u_char *pptr, u_int len)
1600 {
1601 const u_char *tptr = pptr;
1602
1603 /*
1604 * If the path attribute is the optional AS4 path type, then we already
1605 * know, that ASs must be encoded in 4 byte format.
1606 */
1607 if (bgpa_type == BGPTYPE_AS4_PATH) {
1608 return 4;
1609 }
1610
1611 /*
1612 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1613 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1614 * each.
1615 */
1616 while (tptr < pptr + len) {
1617 /*
1618 * If we do not find a valid segment type, our guess might be wrong.
1619 */
1620 if (GET_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || GET_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
1621 goto trunc;
1622 }
1623 tptr += 2 + GET_U_1(tptr + 1) * 2;
1624 }
1625
1626 /*
1627 * If we correctly reached end of the AS path attribute data content,
1628 * then most likely ASs were indeed encoded as 2 bytes.
1629 */
1630 if (tptr == pptr + len) {
1631 return 2;
1632 }
1633
1634 trunc:
1635
1636 /*
1637 * We can come here, either we did not have enough data, or if we
1638 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1639 * so that caller can try to decode each AS as of 4 bytes. If indeed
1640 * there was not enough data, it will crib and end the parse anyways.
1641 */
1642 return 4;
1643 }
1644
1645 /*
1646 * The only way to know that a BGP UPDATE message is using add path is
1647 * by checking if the capability is in the OPEN message which we may have missed.
1648 * So this function checks if it is possible that the update could contain add path
1649 * and if so it checks that standard BGP doesn't make sense.
1650 */
1651 static int
1652 check_add_path(netdissect_options *ndo, const u_char *pptr, u_int length,
1653 u_int max_prefix_length)
1654 {
1655 u_int offset, prefix_length;
1656
1657 if (length < 5) {
1658 return 0;
1659 }
1660
1661 /*
1662 * Scan through the NLRI information under the assumption that
1663 * it doesn't have path IDs.
1664 */
1665 for (offset = 0; offset < length;) {
1666 offset += 4;
1667 if (!ND_TTEST_1(pptr + offset)) {
1668 /* We ran out of captured data; quit scanning. */
1669 break;
1670 }
1671 prefix_length = GET_U_1(pptr + offset);
1672 /*
1673 * Add 4 to cover the path id
1674 * and check the prefix length isn't greater than 32/128.
1675 */
1676 if (prefix_length > max_prefix_length) {
1677 return 0;
1678 }
1679 /* Add 1 for the prefix_length byte and prefix_length to cover the address */
1680 offset += 1 + ((prefix_length + 7) / 8);
1681 }
1682 /* check we haven't gone past the end of the section */
1683 if (offset > length) {
1684 return 0;
1685 }
1686
1687 /* check it's not standard BGP */
1688 for (offset = 0; offset < length; ) {
1689 if (!ND_TTEST_1(pptr + offset)) {
1690 /* We ran out of captured data; quit scanning. */
1691 break;
1692 }
1693 prefix_length = GET_U_1(pptr + offset);
1694 /*
1695 * If the prefix_length is zero (0.0.0.0/0)
1696 * and since it's not the only address (length >= 5)
1697 * then it is add-path
1698 */
1699 if (prefix_length < 1 || prefix_length > max_prefix_length) {
1700 return 1;
1701 }
1702 offset += 1 + ((prefix_length + 7) / 8);
1703 }
1704 if (offset > length) {
1705 return 1;
1706 }
1707
1708 /* assume not add-path by default */
1709 return 0;
1710 }
1711
1712 static int
1713 bgp_mp_af_print(netdissect_options *ndo,
1714 const u_char *tptr, u_int tlen,
1715 uint16_t *afp, uint8_t *safip)
1716 {
1717 uint16_t af;
1718 uint8_t safi;
1719
1720 af = GET_BE_U_2(tptr);
1721 *afp = af;
1722 safi = GET_U_1(tptr + 2);
1723 *safip = safi;
1724
1725 ND_PRINT("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1726 tok2str(af_values, "Unknown AFI", af),
1727 af,
1728 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1729 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1730 safi);
1731
1732 switch(af<<8 | safi) {
1733 case (AFNUM_IP<<8 | SAFNUM_UNICAST):
1734 case (AFNUM_IP<<8 | SAFNUM_MULTICAST):
1735 case (AFNUM_IP<<8 | SAFNUM_UNIMULTICAST):
1736 case (AFNUM_IP<<8 | SAFNUM_LABUNICAST):
1737 case (AFNUM_IP<<8 | SAFNUM_RT_ROUTING_INFO):
1738 case (AFNUM_IP<<8 | SAFNUM_VPNUNICAST):
1739 case (AFNUM_IP<<8 | SAFNUM_VPNMULTICAST):
1740 case (AFNUM_IP<<8 | SAFNUM_VPNUNIMULTICAST):
1741 case (AFNUM_IP<<8 | SAFNUM_MULTICAST_VPN):
1742 case (AFNUM_IP<<8 | SAFNUM_MDT):
1743 case (AFNUM_IP6<<8 | SAFNUM_UNICAST):
1744 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST):
1745 case (AFNUM_IP6<<8 | SAFNUM_UNIMULTICAST):
1746 case (AFNUM_IP6<<8 | SAFNUM_LABUNICAST):
1747 case (AFNUM_IP6<<8 | SAFNUM_VPNUNICAST):
1748 case (AFNUM_IP6<<8 | SAFNUM_VPNMULTICAST):
1749 case (AFNUM_IP6<<8 | SAFNUM_VPNUNIMULTICAST):
1750 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1751 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1752 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1753 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1754 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1755 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1756 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1757 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1758 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1759 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1760 break;
1761 default:
1762 ND_TCHECK_LEN(tptr, tlen);
1763 ND_PRINT("\n\t no AFI %u / SAFI %u decoder", af, safi);
1764 if (ndo->ndo_vflag <= 1)
1765 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1766 return -1;
1767 }
1768 return 0;
1769 trunc:
1770 return -2;
1771 }
1772
1773 static int
1774 bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi,
1775 const u_char *tptr, u_int len,
1776 int add_path4, int add_path6)
1777 {
1778 int advance;
1779 u_int path_id = 0;
1780 char buf[512];
1781
1782 switch (af<<8 | safi) {
1783 case (AFNUM_IP<<8 | SAFNUM_UNICAST):
1784 case (AFNUM_IP<<8 | SAFNUM_MULTICAST):
1785 case (AFNUM_IP<<8 | SAFNUM_UNIMULTICAST):
1786 if (add_path4) {
1787 path_id = GET_BE_U_4(tptr);
1788 tptr += 4;
1789 }
1790 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1791 if (advance == -1)
1792 ND_PRINT("\n\t (illegal prefix length)");
1793 else if (advance == -2)
1794 break; /* bytes left, but not enough */
1795 else
1796 ND_PRINT("\n\t %s", buf);
1797 if (add_path4) {
1798 ND_PRINT(" Path Id: %u", path_id);
1799 advance += 4;
1800 }
1801 break;
1802 case (AFNUM_IP<<8 | SAFNUM_LABUNICAST):
1803 advance = print_labeled_prefix4(ndo, tptr, len);
1804 if (advance == -2)
1805 goto trunc;
1806 break;
1807 case (AFNUM_IP<<8 | SAFNUM_VPNUNICAST):
1808 case (AFNUM_IP<<8 | SAFNUM_VPNMULTICAST):
1809 case (AFNUM_IP<<8 | SAFNUM_VPNUNIMULTICAST):
1810 advance = print_labeled_vpn_prefix4(ndo, tptr);
1811 break;
1812 case (AFNUM_IP<<8 | SAFNUM_RT_ROUTING_INFO):
1813 advance = print_rt_routing_info(ndo, tptr);
1814 break;
1815 case (AFNUM_IP<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1816 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST_VPN):
1817 advance = print_multicast_vpn(ndo, tptr);
1818 if (advance == -2)
1819 goto trunc;
1820 break;
1821
1822 case (AFNUM_IP<<8 | SAFNUM_MDT):
1823 advance = print_mdt_vpn_nlri(ndo, tptr);
1824 if (advance == -2)
1825 goto trunc;
1826 break;
1827 case (AFNUM_IP6<<8 | SAFNUM_UNICAST):
1828 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST):
1829 case (AFNUM_IP6<<8 | SAFNUM_UNIMULTICAST):
1830 if (add_path6) {
1831 path_id = GET_BE_U_4(tptr);
1832 tptr += 4;
1833 }
1834 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1835 if (advance == -1)
1836 ND_PRINT("\n\t (illegal prefix length)");
1837 else if (advance == -2)
1838 break; /* bytes left, but not enough */
1839 else
1840 ND_PRINT("\n\t %s", buf);
1841 if (add_path6) {
1842 ND_PRINT(" Path Id: %u", path_id);
1843 advance += 4;
1844 }
1845 break;
1846 case (AFNUM_IP6<<8 | SAFNUM_LABUNICAST):
1847 advance = print_labeled_prefix6(ndo, tptr, len);
1848 if (advance == -2)
1849 goto trunc;
1850 break;
1851 case (AFNUM_IP6<<8 | SAFNUM_VPNUNICAST):
1852 case (AFNUM_IP6<<8 | SAFNUM_VPNMULTICAST):
1853 case (AFNUM_IP6<<8 | SAFNUM_VPNUNIMULTICAST):
1854 advance = print_labeled_vpn_prefix6(ndo, tptr);
1855 break;
1856 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1857 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1858 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1859 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1860 advance = print_labeled_vpn_l2(ndo, tptr);
1861 if (advance == -2)
1862 goto trunc;
1863 break;
1864 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1865 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1866 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1867 advance = print_clnp_prefix(ndo, tptr);
1868 break;
1869 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1870 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1871 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1872 advance = print_labeled_vpn_clnp_prefix(ndo, tptr);
1873 break;
1874 default:
1875 /*
1876 * This should not happen, we should have been protected
1877 * by bgp_mp_af_print()'s return value.
1878 */
1879 ND_PRINT("\n\t ERROR: no AFI %u / SAFI %u decoder", af, safi);
1880 advance = -4;
1881 break;
1882 }
1883 return advance;
1884 trunc: /* we rely on the caller to recognize -2 return value */
1885 return -2;
1886 }
1887
1888 static const struct tok bgp_flags[] = {
1889 { 0x80, "O"},
1890 { 0x40, "T"},
1891 { 0x20, "P"},
1892 { 0x10, "E"},
1893 { 0, NULL }
1894 };
1895
1896 static int
1897 bgp_attr_print(netdissect_options *ndo,
1898 uint8_t atype, const u_char *pptr, u_int len,
1899 const unsigned attr_set_level)
1900 {
1901 /* allocate space for the largest possible string */
1902 char astostr[AS_STR_SIZE];
1903 u_int i;
1904 uint16_t af;
1905 uint8_t safi, snpa, nhlen;
1906 int advance;
1907 u_int tlen;
1908 const u_char *tptr;
1909 u_int as_size;
1910 int add_path4, add_path6;
1911 int ret;
1912
1913 tptr = pptr;
1914 tlen = len;
1915
1916 switch (atype) {
1917 case BGPTYPE_ORIGIN:
1918 if (len != 1)
1919 ND_PRINT("invalid len");
1920 else {
1921 ND_PRINT("%s", tok2str(bgp_origin_values,
1922 "Unknown Origin Typecode",
1923 GET_U_1(tptr)));
1924 }
1925 break;
1926
1927 /*
1928 * Process AS4 byte path and AS2 byte path attributes here.
1929 */
1930 case BGPTYPE_AS4_PATH:
1931 case BGPTYPE_AS_PATH:
1932 if (len % 2) {
1933 ND_PRINT("invalid len");
1934 break;
1935 }
1936 if (!len) {
1937 ND_PRINT("empty");
1938 break;
1939 }
1940
1941 /*
1942 * BGP updates exchanged between New speakers that support 4
1943 * byte AS, ASs are always encoded in 4 bytes. There is no
1944 * definitive way to find this, just by the packet's
1945 * contents. So, check for packet's TLV's sanity assuming
1946 * 2 bytes first, and it does not pass, assume that ASs are
1947 * encoded in 4 bytes format and move on.
1948 */
1949 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1950
1951 while (tptr < pptr + len) {
1952 ND_PRINT("%s", tok2str(bgp_as_path_segment_open_values,
1953 "?", GET_U_1(tptr)));
1954 for (i = 0; i < GET_U_1(tptr + 1) * as_size; i += as_size) {
1955 ND_TCHECK_LEN(tptr + 2 + i, as_size);
1956 ND_PRINT("%s ",
1957 as_printf(ndo, astostr, sizeof(astostr),
1958 as_size == 2 ?
1959 GET_BE_U_2(tptr + i + 2) :
1960 GET_BE_U_4(tptr + i + 2)));
1961 }
1962 ND_PRINT("%s", tok2str(bgp_as_path_segment_close_values,
1963 "?", GET_U_1(tptr)));
1964 tptr += 2 + GET_U_1(tptr + 1) * as_size;
1965 }
1966 break;
1967 case BGPTYPE_NEXT_HOP:
1968 if (len != 4)
1969 ND_PRINT("invalid len");
1970 else {
1971 ND_PRINT("%s", GET_IPADDR_STRING(tptr));
1972 }
1973 break;
1974 case BGPTYPE_MULTI_EXIT_DISC:
1975 case BGPTYPE_LOCAL_PREF:
1976 if (len != 4)
1977 ND_PRINT("invalid len");
1978 else {
1979 ND_PRINT("%u", GET_BE_U_4(tptr));
1980 }
1981 break;
1982 case BGPTYPE_ATOMIC_AGGREGATE:
1983 if (len != 0)
1984 ND_PRINT("invalid len");
1985 break;
1986 case BGPTYPE_AGGREGATOR:
1987
1988 /*
1989 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1990 * the length of this PA can be either 6 bytes or 8 bytes.
1991 */
1992 if (len != 6 && len != 8) {
1993 ND_PRINT("invalid len");
1994 break;
1995 }
1996 ND_TCHECK_LEN(tptr, len);
1997 if (len == 6) {
1998 ND_PRINT(" AS #%s, origin %s",
1999 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(tptr)),
2000 GET_IPADDR_STRING(tptr + 2));
2001 } else {
2002 ND_PRINT(" AS #%s, origin %s",
2003 as_printf(ndo, astostr, sizeof(astostr),
2004 GET_BE_U_4(tptr)), GET_IPADDR_STRING(tptr + 4));
2005 }
2006 break;
2007 case BGPTYPE_AGGREGATOR4:
2008 if (len != 8) {
2009 ND_PRINT("invalid len");
2010 break;
2011 }
2012 ND_PRINT(" AS #%s, origin %s",
2013 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)),
2014 GET_IPADDR_STRING(tptr + 4));
2015 break;
2016 case BGPTYPE_COMMUNITIES:
2017 if (len % 4) {
2018 ND_PRINT("invalid len");
2019 break;
2020 }
2021 while (tlen != 0) {
2022 uint32_t comm;
2023 ND_TCHECK_4(tptr);
2024 if (tlen < 4)
2025 goto trunc;
2026 comm = GET_BE_U_4(tptr);
2027 switch (comm) {
2028 case BGP_COMMUNITY_NO_EXPORT:
2029 ND_PRINT(" NO_EXPORT");
2030 break;
2031 case BGP_COMMUNITY_NO_ADVERT:
2032 ND_PRINT(" NO_ADVERTISE");
2033 break;
2034 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
2035 ND_PRINT(" NO_EXPORT_SUBCONFED");
2036 break;
2037 default:
2038 ND_PRINT("%u:%u%s",
2039 (comm >> 16) & 0xffff,
2040 comm & 0xffff,
2041 (tlen>4) ? ", " : "");
2042 break;
2043 }
2044 tlen -=4;
2045 tptr +=4;
2046 }
2047 break;
2048 case BGPTYPE_ORIGINATOR_ID:
2049 if (len != 4) {
2050 ND_PRINT("invalid len");
2051 break;
2052 }
2053 ND_PRINT("%s",GET_IPADDR_STRING(tptr));
2054 break;
2055 case BGPTYPE_CLUSTER_LIST:
2056 if (len % 4) {
2057 ND_PRINT("invalid len");
2058 break;
2059 }
2060 while (tlen != 0) {
2061 if (tlen < 4)
2062 goto trunc;
2063 ND_PRINT("%s%s",
2064 GET_IPADDR_STRING(tptr),
2065 (tlen>4) ? ", " : "");
2066 tlen -=4;
2067 tptr +=4;
2068 }
2069 break;
2070 case BGPTYPE_MP_REACH_NLRI:
2071 ND_TCHECK_3(tptr);
2072 if (tlen < 3)
2073 goto trunc;
2074 ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
2075 if (ret == -2)
2076 goto trunc;
2077 if (ret < 0)
2078 break;
2079
2080 tptr += 3;
2081 tlen -= 3;
2082
2083 ND_TCHECK_1(tptr);
2084 if (tlen < 1)
2085 goto trunc;
2086 nhlen = GET_U_1(tptr);
2087 tptr++;
2088 tlen--;
2089
2090 if (nhlen) {
2091 u_int nnh = 0;
2092 uint8_t tnhlen = nhlen;
2093 if (tlen < tnhlen)
2094 goto trunc;
2095 ND_PRINT("\n\t nexthop: ");
2096 while (tnhlen != 0) {
2097 if (nnh++ > 0) {
2098 ND_PRINT(", " );
2099 }
2100 switch(af<<8 | safi) {
2101 case (AFNUM_IP<<8 | SAFNUM_UNICAST):
2102 case (AFNUM_IP<<8 | SAFNUM_MULTICAST):
2103 case (AFNUM_IP<<8 | SAFNUM_UNIMULTICAST):
2104 case (AFNUM_IP<<8 | SAFNUM_LABUNICAST):
2105 case (AFNUM_IP<<8 | SAFNUM_RT_ROUTING_INFO):
2106 case (AFNUM_IP<<8 | SAFNUM_MULTICAST_VPN):
2107 case (AFNUM_IP<<8 | SAFNUM_MDT):
2108 if (tnhlen < sizeof(nd_ipv4)) {
2109 ND_PRINT("invalid len");
2110 tptr += tnhlen;
2111 tlen -= tnhlen;
2112 tnhlen = 0;
2113 } else {
2114 ND_PRINT("%s",GET_IPADDR_STRING(tptr));
2115 tptr += sizeof(nd_ipv4);
2116 tnhlen -= sizeof(nd_ipv4);
2117 tlen -= sizeof(nd_ipv4);
2118 }
2119 break;
2120 case (AFNUM_IP<<8 | SAFNUM_VPNUNICAST):
2121 case (AFNUM_IP<<8 | SAFNUM_VPNMULTICAST):
2122 case (AFNUM_IP<<8 | SAFNUM_VPNUNIMULTICAST):
2123 if (tnhlen < sizeof(nd_ipv4)+BGP_VPN_RD_LEN) {
2124 ND_PRINT("invalid len");
2125 tptr += tnhlen;
2126 tlen -= tnhlen;
2127 tnhlen = 0;
2128 } else {
2129 ND_PRINT("RD: %s, %s",
2130 bgp_vpn_rd_print(ndo, tptr),
2131 GET_IPADDR_STRING(tptr+BGP_VPN_RD_LEN));
2132 tptr += (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2133 tlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2134 tnhlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2135 }
2136 break;
2137 case (AFNUM_IP6<<8 | SAFNUM_UNICAST):
2138 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST):
2139 case (AFNUM_IP6<<8 | SAFNUM_UNIMULTICAST):
2140 case (AFNUM_IP6<<8 | SAFNUM_LABUNICAST):
2141 if (tnhlen < sizeof(nd_ipv6)) {
2142 ND_PRINT("invalid len");
2143 tptr += tnhlen;
2144 tlen -= tnhlen;
2145 tnhlen = 0;
2146 } else {
2147 ND_PRINT("%s", GET_IP6ADDR_STRING(tptr));
2148 tptr += sizeof(nd_ipv6);
2149 tlen -= sizeof(nd_ipv6);
2150 tnhlen -= sizeof(nd_ipv6);
2151 }
2152 break;
2153 case (AFNUM_IP6<<8 | SAFNUM_VPNUNICAST):
2154 case (AFNUM_IP6<<8 | SAFNUM_VPNMULTICAST):
2155 case (AFNUM_IP6<<8 | SAFNUM_VPNUNIMULTICAST):
2156 if (tnhlen < sizeof(nd_ipv6)+BGP_VPN_RD_LEN) {
2157 ND_PRINT("invalid len");
2158 tptr += tnhlen;
2159 tlen -= tnhlen;
2160 tnhlen = 0;
2161 } else {
2162 ND_PRINT("RD: %s, %s",
2163 bgp_vpn_rd_print(ndo, tptr),
2164 GET_IP6ADDR_STRING(tptr+BGP_VPN_RD_LEN));
2165 tptr += (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2166 tlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2167 tnhlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2168 }
2169 break;
2170 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
2171 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2172 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2173 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2174 if (tnhlen < sizeof(nd_ipv4)) {
2175 ND_PRINT("invalid len");
2176 tptr += tnhlen;
2177 tlen -= tnhlen;
2178 tnhlen = 0;
2179 } else {
2180 ND_PRINT("%s", GET_IPADDR_STRING(tptr));
2181 tptr += (sizeof(nd_ipv4));
2182 tlen -= (sizeof(nd_ipv4));
2183 tnhlen -= (sizeof(nd_ipv4));
2184 }
2185 break;
2186 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2187 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2188 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2189 ND_PRINT("%s", GET_ISONSAP_STRING(tptr, tnhlen));
2190 tptr += tnhlen;
2191 tlen -= tnhlen;
2192 tnhlen = 0;
2193 break;
2194
2195 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2196 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2197 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2198 if (tnhlen < BGP_VPN_RD_LEN+1) {
2199 ND_PRINT("invalid len");
2200 tptr += tnhlen;
2201 tlen -= tnhlen;
2202 tnhlen = 0;
2203 } else {
2204 ND_TCHECK_LEN(tptr, tnhlen);
2205 ND_PRINT("RD: %s, %s",
2206 bgp_vpn_rd_print(ndo, tptr),
2207 GET_ISONSAP_STRING(tptr+BGP_VPN_RD_LEN,tnhlen-BGP_VPN_RD_LEN));
2208 /* rfc986 mapped IPv4 address ? */
2209 if (GET_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
2210 ND_PRINT(" = %s", GET_IPADDR_STRING(tptr+BGP_VPN_RD_LEN+4));
2211 /* rfc1888 mapped IPv6 address ? */
2212 else if (GET_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
2213 ND_PRINT(" = %s", GET_IP6ADDR_STRING(tptr+BGP_VPN_RD_LEN+3));
2214 tptr += tnhlen;
2215 tlen -= tnhlen;
2216 tnhlen = 0;
2217 }
2218 break;
2219 default:
2220 /*
2221 * bgp_mp_af_print() should have saved us from
2222 * an unsupported AFI/SAFI.
2223 */
2224 ND_PRINT("ERROR: no AFI %u/SAFI %u nexthop decoder", af, safi);
2225 tptr += tnhlen;
2226 tlen -= tnhlen;
2227 tnhlen = 0;
2228 goto done;
2229 }
2230 }
2231 }
2232 ND_PRINT(", nh-length: %u", nhlen);
2233
2234 /* As per RFC 2858; this is reserved in RFC 4760 */
2235 if (tlen < 1)
2236 goto trunc;
2237 snpa = GET_U_1(tptr);
2238 tptr++;
2239 tlen--;
2240
2241 if (snpa) {
2242 ND_PRINT("\n\t %u SNPA", snpa);
2243 for (/*nothing*/; snpa != 0; snpa--) {
2244 uint8_t snpalen;
2245 if (tlen < 1)
2246 goto trunc;
2247 snpalen = GET_U_1(tptr);
2248 ND_PRINT("\n\t %u bytes", snpalen);
2249 tptr++;
2250 tlen--;
2251 if (tlen < snpalen)
2252 goto trunc;
2253 ND_TCHECK_LEN(tptr, snpalen);
2254 tptr += snpalen;
2255 tlen -= snpalen;
2256 }
2257 } else {
2258 ND_PRINT(", no SNPA");
2259 }
2260
2261 add_path4 = check_add_path(ndo, tptr,
2262 (len-ND_BYTES_BETWEEN(pptr, tptr)), 32);
2263 add_path6 = check_add_path(ndo, tptr,
2264 (len-ND_BYTES_BETWEEN(pptr, tptr)), 128);
2265
2266 while (tptr < pptr + len) {
2267 advance = bgp_nlri_print(ndo, af, safi, tptr, len,
2268 add_path4, add_path6);
2269 if (advance == -2)
2270 goto trunc;
2271 if (advance < 0)
2272 break;
2273 tptr += advance;
2274 }
2275 break;
2276
2277 case BGPTYPE_MP_UNREACH_NLRI:
2278 ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
2279 ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
2280 if (ret == -2)
2281 goto trunc;
2282 if (ret < 0)
2283 break;
2284
2285 if (len == BGP_MP_NLRI_MINSIZE)
2286 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2287
2288 tptr += 3;
2289
2290 add_path4 = check_add_path(ndo, tptr,
2291 (len-ND_BYTES_BETWEEN(pptr, tptr)), 32);
2292 add_path6 = check_add_path(ndo, tptr,
2293 (len-ND_BYTES_BETWEEN(pptr, tptr)), 128);
2294
2295 while (tptr < pptr + len) {
2296 advance = bgp_nlri_print(ndo, af, safi, tptr, len,
2297 add_path4, add_path6);
2298 if (advance == -2)
2299 goto trunc;
2300 if (advance < 0)
2301 break;
2302 tptr += advance;
2303 }
2304 break;
2305 case BGPTYPE_EXTD_COMMUNITIES:
2306 if (len % 8) {
2307 ND_PRINT("invalid len");
2308 break;
2309 }
2310 while (tlen != 0) {
2311 uint16_t extd_comm;
2312
2313 ND_TCHECK_2(tptr);
2314 if (tlen < 2)
2315 goto trunc;
2316 extd_comm=GET_BE_U_2(tptr);
2317
2318 ND_PRINT("\n\t %s (0x%04x), Flags [%s]",
2319 tok2str(bgp_extd_comm_subtype_values,
2320 "unknown extd community typecode",
2321 extd_comm),
2322 extd_comm,
2323 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm));
2324
2325 ND_TCHECK_8(tptr);
2326 if (tlen < 8)
2327 goto trunc;
2328 ND_PRINT(": ");
2329 bgp_extended_community_print(ndo, tptr);
2330 tlen -= 8;
2331 tptr += 8;
2332 }
2333 break;
2334
2335 case BGPTYPE_PMSI_TUNNEL:
2336 {
2337 uint8_t tunnel_type, flags;
2338
2339 ND_TCHECK_5(tptr);
2340 if (tlen < 5)
2341 goto trunc;
2342 flags = GET_U_1(tptr);
2343 tunnel_type = GET_U_1(tptr + 1);
2344
2345 ND_PRINT("\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2346 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2347 tunnel_type,
2348 bittok2str(bgp_pmsi_flag_values, "none", flags),
2349 GET_BE_U_3(tptr + 2)>>4);
2350
2351 tptr +=5;
2352 tlen -= 5;
2353
2354 switch (tunnel_type) {
2355 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2356 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2357 ND_PRINT("\n\t Sender %s, P-Group %s",
2358 GET_IPADDR_STRING(tptr),
2359 GET_IPADDR_STRING(tptr+4));
2360 break;
2361
2362 case BGP_PMSI_TUNNEL_PIM_SSM:
2363 ND_PRINT("\n\t Root-Node %s, P-Group %s",
2364 GET_IPADDR_STRING(tptr),
2365 GET_IPADDR_STRING(tptr+4));
2366 break;
2367 case BGP_PMSI_TUNNEL_INGRESS:
2368 ND_PRINT("\n\t Tunnel-Endpoint %s",
2369 GET_IPADDR_STRING(tptr));
2370 break;
2371 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2372 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2373 ND_PRINT("\n\t Root-Node %s, LSP-ID 0x%08x",
2374 GET_IPADDR_STRING(tptr),
2375 GET_BE_U_4(tptr + 4));
2376 break;
2377 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2378 ND_PRINT("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2379 GET_IPADDR_STRING(tptr),
2380 GET_BE_U_4(tptr + 4));
2381 break;
2382 default:
2383 if (ndo->ndo_vflag <= 1) {
2384 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2385 }
2386 }
2387 break;
2388 }
2389 case BGPTYPE_AIGP:
2390 {
2391 uint8_t type;
2392 uint16_t length;
2393
2394 while (tlen >= 3) {
2395 type = GET_U_1(tptr);
2396 length = GET_BE_U_2(tptr + 1);
2397 tptr += 3;
2398 tlen -= 3;
2399
2400 ND_PRINT("\n\t %s TLV (%u), length %u",
2401 tok2str(bgp_aigp_values, "Unknown", type),
2402 type, length);
2403
2404 if (length < 3)
2405 goto trunc;
2406 length -= 3;
2407
2408 /*
2409 * Check if we can read the TLV data.
2410 */
2411 if (tlen < length)
2412 goto trunc;
2413
2414 switch (type) {
2415
2416 case BGP_AIGP_TLV:
2417 if (length < 8)
2418 goto trunc;
2419 ND_PRINT(", metric %" PRIu64,
2420 GET_BE_U_8(tptr));
2421 break;
2422
2423 default:
2424 if (ndo->ndo_vflag <= 1) {
2425 print_unknown_data(ndo, tptr,"\n\t ", length);
2426 }
2427 }
2428
2429 tptr += length;
2430 tlen -= length;
2431 }
2432 break;
2433 }
2434 case BGPTYPE_ATTR_SET:
2435 ND_TCHECK_4(tptr);
2436 if (len < 4)
2437 goto trunc;
2438 ND_PRINT("\n\t Origin AS: %s",
2439 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)));
2440 tptr += 4;
2441 len -= 4;
2442
2443 while (len) {
2444 u_int aflags, alenlen, alen;
2445
2446 ND_TCHECK_2(tptr);
2447 if (len < 2) {
2448 ND_PRINT(" [path attr too short]");
2449 tptr += len;
2450 break;
2451 }
2452 aflags = GET_U_1(tptr);
2453 atype = GET_U_1(tptr + 1);
2454 tptr += 2;
2455 len -= 2;
2456 alenlen = bgp_attr_lenlen(aflags, tptr);
2457 ND_TCHECK_LEN(tptr, alenlen);
2458 if (len < alenlen) {
2459 ND_PRINT(" [path attr too short]");
2460 tptr += len;
2461 break;
2462 }
2463 alen = bgp_attr_len(aflags, tptr);
2464 tptr += alenlen;
2465 len -= alenlen;
2466
2467 ND_PRINT("\n\t %s (%u), length: %u",
2468 tok2str(bgp_attr_values,
2469 "Unknown Attribute", atype),
2470 atype,
2471 alen);
2472
2473 if (aflags) {
2474 ND_PRINT(", Flags [%s",
2475 bittok2str_nosep(bgp_flags, "", aflags));
2476 if (aflags & 0xf)
2477 ND_PRINT("+%x", aflags & 0xf);
2478 ND_PRINT("]");
2479 }
2480 ND_PRINT(": ");
2481 if (len < alen) {
2482 ND_PRINT(" [path attr too short]");
2483 tptr += len;
2484 break;
2485 }
2486 /*
2487 * The protocol encoding per se allows ATTR_SET to be nested
2488 * as many times as the message can accommodate. This printer
2489 * used to be able to recurse into ATTR_SET contents until the
2490 * stack exhaustion, but now there is a limit on that (if live
2491 * protocol exchange goes that many levels deep, something is
2492 * probably wrong anyway). Feel free to refine this value if
2493 * you can find the spec with respective normative text.
2494 */
2495 if (attr_set_level == 10)
2496 ND_PRINT("(too many nested levels, not recursing)");
2497 else if (!bgp_attr_print(ndo, atype, tptr, alen, attr_set_level + 1))
2498 return 0;
2499 tptr += alen;
2500 len -= alen;
2501 }
2502 break;
2503
2504 case BGPTYPE_LARGE_COMMUNITY:
2505 if (len == 0 || len % 12) {
2506 ND_PRINT("invalid len");
2507 break;
2508 }
2509 ND_PRINT("\n\t ");
2510 while (len != 0) {
2511 ND_PRINT("%u:%u:%u%s",
2512 GET_BE_U_4(tptr),
2513 GET_BE_U_4(tptr + 4),
2514 GET_BE_U_4(tptr + 8),
2515 (len > 12) ? ", " : "");
2516 tptr += 12;
2517 /*
2518 * len will always be a multiple of 12, as per the above,
2519 * so this will never underflow.
2520 */
2521 len -= 12;
2522 }
2523 break;
2524 case BGPTYPE_BGPSEC_PATH:
2525 {
2526 uint16_t sblen, splen;
2527
2528 splen = GET_BE_U_2(tptr);
2529
2530 /*
2531 * A secure path has a minimum length of 8 bytes:
2532 * 2 bytes length field
2533 * 6 bytes per secure path segment
2534 */
2535 ND_ICHECKMSG_U("secure path length", splen, <, 8);
2536
2537 ND_PRINT("\n\t Secure Path Length: %u", splen);
2538
2539 tptr += 2;
2540 splen -= 2;
2541 /* Make sure the secure path length does not signal trailing bytes */
2542 if (splen % 6) {
2543 ND_PRINT(" [total segments length %u != N x 6]", splen);
2544 goto invalid;
2545 }
2546
2547 /* Parse secure path segments */
2548 while (splen != 0) {
2549 uint8_t pcount = GET_U_1(tptr);
2550 uint8_t flags = GET_U_1(tptr + 1);
2551 uint32_t asn = GET_BE_U_4(tptr + 2);
2552 ND_PRINT("\n\t Secure Path Segment: pCount: %u, Flags: [%s] (0x%02x), AS: %u",
2553 pcount,
2554 bittok2str(bgp_bgpsec_bitmap_str, "none", flags),
2555 flags,
2556 asn);
2557 tptr += 6;
2558 splen -= 6;
2559 }
2560
2561 sblen = GET_BE_U_2(tptr);
2562
2563 ND_PRINT("\n\t Signature Block: Length: %u, Algo ID: %u",
2564 sblen,
2565 GET_U_1(tptr + 2));
2566
2567 tptr += 3;
2568 sblen -= 3;
2569 /* Parse signature segments */
2570 while (sblen != 0) {
2571 uint16_t siglen;
2572
2573 ND_PRINT("\n\t Signature Segment:\n\t SKI: ");
2574 ND_ICHECKMSG_U("remaining length", sblen, <, 20);
2575 hex_print(ndo, "\n\t ", tptr, 20);
2576 tptr += 20;
2577 sblen -= 20;
2578 ND_ICHECKMSG_U("remaining length", sblen, <, 2);
2579 siglen = GET_BE_U_2(tptr);
2580 tptr += 2;
2581 sblen -= 2;
2582
2583 ND_PRINT("\n\t Length: %u", siglen);
2584 ND_ICHECKMSG_U("remaining length", sblen, <, siglen);
2585 ND_PRINT("\n\t Signature:");
2586 hex_print(ndo, "\n\t ", tptr, siglen);
2587 tptr += siglen;
2588 sblen -= siglen;
2589 }
2590 break;
2591 }
2592 case BGPTYPE_OTC:
2593 {
2594 if (len < 4) {
2595 ND_PRINT("invalid len");
2596 break;
2597 }
2598 ND_PRINT("\n\t OTC %u", GET_BE_U_4(pptr));
2599 break;
2600 }
2601 default:
2602 ND_TCHECK_LEN(pptr, len);
2603 ND_PRINT("\n\t no Attribute %u decoder", atype); /* we have no decoder for the attribute */
2604 if (ndo->ndo_vflag <= 1)
2605 print_unknown_data(ndo, pptr, "\n\t ", len);
2606 break;
2607 }
2608 done:
2609 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2610 ND_TCHECK_LEN(pptr, len);
2611 print_unknown_data(ndo, pptr, "\n\t ", len);
2612 }
2613 return 1;
2614
2615 invalid:
2616 nd_print_invalid(ndo);
2617 return 1;
2618
2619 trunc:
2620 return 0;
2621 }
2622
2623 static void
2624 bgp_capabilities_print(netdissect_options *ndo,
2625 const u_char *opt, u_int caps_len)
2626 {
2627 /* allocate space for the largest possible string */
2628 char astostr[AS_STR_SIZE];
2629 u_int cap_type, cap_len, tcap_len, cap_offset;
2630 u_int i = 0;
2631
2632 while (i < caps_len) {
2633 ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
2634 cap_type=GET_U_1(opt + i);
2635 cap_len=GET_U_1(opt + i + 1);
2636 ND_PRINT("\n\t %s (%u), length: %u",
2637 tok2str(bgp_capcode_values, "Unknown", cap_type),
2638 cap_type,
2639 cap_len);
2640 ND_TCHECK_LEN(opt + 2 + i, cap_len);
2641 switch (cap_type) {
2642 case BGP_CAPCODE_MP:
2643 /* AFI (16 bits), Reserved (8 bits), SAFI (8 bits) */
2644 if (cap_len < 4) {
2645 ND_PRINT(" (too short, < 4)");
2646 return;
2647 }
2648 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u)",
2649 tok2str(af_values, "Unknown", GET_BE_U_2(opt + i + 2)),
2650 GET_BE_U_2(opt + i + 2),
2651 tok2str(bgp_safi_values, "Unknown", GET_U_1(opt + i + 5)),
2652 GET_U_1(opt + i + 5));
2653 break;
2654 case BGP_CAPCODE_BGPSEC:
2655 /* Version (4 bits), Direction (1 bit), Flags (3 bits), AFI (16 bits) */
2656 cap_offset = 1;
2657 /* The capability length [...] MUST be set to 3. */
2658 if (cap_len != 3) {
2659 ND_PRINT(" [%u != 3]", cap_len);
2660 return;
2661 }
2662
2663 ND_PRINT("\n\t\tVersion %u, Direction %s (%u), AFI %s (%u)",
2664 GET_U_1(opt + i + 2)&0xf0,
2665 (GET_U_1(opt + i + 2)&0x08) ? "Send" : "Receive",
2666 (GET_U_1(opt + i + 2)&0x08)>>3,
2667 bittok2str(af_values, "Unknown",
2668 GET_BE_U_2(opt + i + cap_offset + 2)),
2669 GET_BE_U_2(opt + i + cap_offset + 2));
2670 break;
2671 case BGP_CAPCODE_ML:
2672 cap_offset = 2;
2673 tcap_len = cap_len;
2674 while (tcap_len >= 4) {
2675 ND_PRINT( "\n\t\tAFI %s (%u), SAFI %s (%u), Count: %u",
2676 tok2str(af_values, "Unknown",
2677 GET_BE_U_2(opt + i + cap_offset)),
2678 GET_BE_U_2(opt + i + cap_offset),
2679 tok2str(bgp_safi_values, "Unknown",
2680 GET_U_1(opt + i + cap_offset + 2)),
2681 GET_U_1(opt + i + cap_offset + 2),
2682 GET_U_1(opt + i + cap_offset + 3));
2683 tcap_len -= 4;
2684 cap_offset += 4;
2685 }
2686 break;
2687 case BGP_CAPCODE_RESTART:
2688 /* Restart Flags (4 bits), Restart Time in seconds (12 bits) */
2689 if (cap_len < 2) {
2690 ND_PRINT(" (too short, < 2)");
2691 return;
2692 }
2693 tcap_len=cap_len;
2694 ND_PRINT("\n\t\tRestart Flags: [%s], Restart Time %us",
2695 bittok2str(bgp_graceful_restart_comm_flag_values,
2696 "none", GET_U_1(opt + i + 2) >> 4),
2697 GET_BE_U_2(opt + i + 2)&0xfff);
2698 tcap_len-=2;
2699 cap_offset=4;
2700 while(tcap_len>=4) {
2701 ND_PRINT("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2702 tok2str(af_values,"Unknown",
2703 GET_BE_U_2(opt + i + cap_offset)),
2704 GET_BE_U_2(opt + i + cap_offset),
2705 tok2str(bgp_safi_values,"Unknown",
2706 GET_U_1(opt + i + cap_offset + 2)),
2707 GET_U_1(opt + (i + cap_offset + 2)),
2708 ((GET_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" );
2709 tcap_len -= 4;
2710 cap_offset += 4;
2711 }
2712 break;
2713 case BGP_CAPCODE_ROLE:
2714 if (cap_len < 1) {
2715 ND_PRINT(" (too short, < 1)");
2716 return;
2717 }
2718 ND_PRINT("\n\t\tRole name %s (%u)",
2719 tok2str(bgp_role_values, "Unassigned",
2720 GET_U_1(opt + i + 2)), GET_U_1(opt + i + 2));
2721 break;
2722 case BGP_CAPCODE_RR:
2723 case BGP_CAPCODE_LLGR:
2724 case BGP_CAPCODE_RR_CISCO:
2725 case BGP_CAPCODE_EXT_MSG:
2726 case BGP_CAPCODE_ENH_RR:
2727 break;
2728 case BGP_CAPCODE_AS_NEW:
2729 /*
2730 * Extract the 4 byte AS number encoded.
2731 */
2732 if (cap_len < 4) {
2733 ND_PRINT(" (too short, < 4)");
2734 return;
2735 }
2736 ND_PRINT("\n\t\t 4 Byte AS %s",
2737 as_printf(ndo, astostr, sizeof(astostr),
2738 GET_BE_U_4(opt + i + 2)));
2739 break;
2740 case BGP_CAPCODE_ADD_PATH:
2741 if (cap_len == 0) {
2742 ND_PRINT(" (bogus)"); /* length */
2743 break;
2744 }
2745 tcap_len=cap_len;
2746 cap_offset=2;
2747 while (tcap_len != 0) {
2748 if (tcap_len < 4) {
2749 nd_print_invalid(ndo);
2750 break;
2751 }
2752 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2753 tok2str(af_values,"Unknown",GET_BE_U_2(opt + i + cap_offset)),
2754 GET_BE_U_2(opt + i + cap_offset),
2755 tok2str(bgp_safi_values,"Unknown",GET_U_1(opt + i + cap_offset + 2)),
2756 GET_U_1(opt + (i + cap_offset + 2)),
2757 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",GET_U_1(opt + i + cap_offset + 3))
2758 );
2759 tcap_len -= 4;
2760 cap_offset += 4;
2761 }
2762 break;
2763 default:
2764 ND_PRINT("\n\t\tno decoder for Capability %u",
2765 cap_type);
2766 if (ndo->ndo_vflag <= 1)
2767 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2768 cap_len);
2769 break;
2770 }
2771 if (ndo->ndo_vflag > 1 && cap_len != 0) {
2772 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2773 }
2774 i += BGP_CAP_HEADER_SIZE + cap_len;
2775 }
2776 return;
2777
2778 trunc:
2779 nd_print_trunc(ndo);
2780 }
2781
2782 static void
2783 bgp_open_print(netdissect_options *ndo,
2784 const u_char *dat, u_int length)
2785 {
2786 /* allocate space for the largest possible string */
2787 char astostr[AS_STR_SIZE];
2788 const struct bgp_open *bgp_open_header;
2789 u_int optslen;
2790 uint8_t opsttype;
2791 const struct bgp_opt *bgpopt;
2792 const u_char *opt;
2793 u_int i;
2794 uint8_t extended_opt_params = 0;
2795 u_int open_size = BGP_OPEN_SIZE;
2796 u_int opt_size = BGP_OPT_SIZE;
2797
2798 ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
2799 if (length < BGP_OPEN_SIZE)
2800 goto trunc;
2801
2802 bgp_open_header = (const struct bgp_open *)dat;
2803
2804 ND_PRINT("\n\t Version %u, ",
2805 GET_U_1(bgp_open_header->bgpo_version));
2806 ND_PRINT("my AS %s, ",
2807 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(bgp_open_header->bgpo_myas)));
2808 ND_PRINT("Holdtime %us, ",
2809 GET_BE_U_2(bgp_open_header->bgpo_holdtime));
2810 ND_PRINT("ID %s", GET_IPADDR_STRING(bgp_open_header->bgpo_id));
2811 optslen = GET_U_1(bgp_open_header->bgpo_optlen);
2812 opsttype = GET_U_1(bgp_open_header->bgpo_opttype);
2813 if (opsttype == BGP_OPEN_NON_EXT_OPT_TYPE_EXTENDED_LENGTH) {
2814 optslen = GET_BE_U_2(bgp_open_header->bgpo_optlen_extended);
2815 extended_opt_params = 1;
2816 open_size += 3;
2817 opt_size += 1;
2818 }
2819 ND_PRINT("\n\t Optional parameters%s, length: %u",
2820 extended_opt_params ? " (Extended)" : "", optslen);
2821
2822 opt = dat + open_size;
2823 length -= open_size;
2824
2825 i = 0;
2826 while (i < optslen) {
2827 uint8_t opt_type;
2828 uint16_t opt_len;
2829
2830 ND_TCHECK_LEN(opt + i, opt_size);
2831 if (length < opt_size + i)
2832 goto trunc;
2833 bgpopt = (const struct bgp_opt *)(opt + i);
2834 opt_type = GET_U_1(bgpopt->bgpopt_type);
2835 opt_len = extended_opt_params ? GET_BE_U_2(bgpopt->bgpopt_len)
2836 : GET_U_1(bgpopt->bgpopt_len);
2837 if (opt_size + i + opt_len > optslen) {
2838 ND_PRINT("\n\t Option %u, length: %u, goes past the end of the options",
2839 opt_type, opt_len);
2840 break;
2841 }
2842
2843 ND_PRINT("\n\t Option %s (%u), length: %u",
2844 tok2str(bgp_opt_values,"Unknown",opt_type),
2845 opt_type,
2846 opt_len);
2847
2848 /* now let's decode the options we know*/
2849 switch(opt_type) {
2850
2851 case BGP_OPT_CAP:
2852 bgp_capabilities_print(ndo, opt + opt_size + i,
2853 opt_len);
2854 break;
2855
2856 case BGP_OPT_AUTH:
2857 default:
2858 ND_PRINT("\n\t no decoder for option %u",
2859 opt_type);
2860 break;
2861 }
2862 i += opt_size + opt_len;
2863 }
2864 return;
2865 trunc:
2866 nd_print_trunc(ndo);
2867 }
2868
2869 static void
2870 bgp_update_print(netdissect_options *ndo,
2871 const u_char *dat, u_int length)
2872 {
2873 const u_char *p;
2874 u_int withdrawn_routes_len;
2875 char buf[512];
2876 int wpfx;
2877 u_int len;
2878 int i;
2879 int add_path;
2880 u_int path_id = 0;
2881
2882 ND_TCHECK_LEN(dat, BGP_SIZE);
2883 if (length < BGP_SIZE)
2884 goto trunc;
2885 p = dat + BGP_SIZE;
2886 length -= BGP_SIZE;
2887
2888 /* Unfeasible routes */
2889 ND_TCHECK_2(p);
2890 if (length < 2)
2891 goto trunc;
2892 withdrawn_routes_len = GET_BE_U_2(p);
2893 p += 2;
2894 length -= 2;
2895 if (withdrawn_routes_len > 1) {
2896 /*
2897 * Without keeping state from the original NLRI message,
2898 * it's not possible to tell if this a v4 or v6 route,
2899 * so only try to decode it if we're not v6 enabled.
2900 */
2901 ND_TCHECK_LEN(p, withdrawn_routes_len);
2902 if (length < withdrawn_routes_len)
2903 goto trunc;
2904 ND_PRINT("\n\t Withdrawn routes:");
2905 add_path = check_add_path(ndo, p, withdrawn_routes_len, 32);
2906 while (withdrawn_routes_len != 0) {
2907 if (add_path) {
2908 if (withdrawn_routes_len < 4) {
2909 p += withdrawn_routes_len;
2910 length -= withdrawn_routes_len;
2911 break;
2912 }
2913 path_id = GET_BE_U_4(p);
2914 p += 4;
2915 length -= 4;
2916 withdrawn_routes_len -= 4;
2917 }
2918 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
2919 if (wpfx == -1) {
2920 ND_PRINT("\n\t (illegal prefix length)");
2921 break;
2922 } else if (wpfx == -2)
2923 goto trunc; /* bytes left, but not enough */
2924 else {
2925 ND_PRINT("\n\t %s", buf);
2926 if (add_path) {
2927 ND_PRINT(" Path Id: %u", path_id);
2928 }
2929 p += wpfx;
2930 length -= wpfx;
2931 withdrawn_routes_len -= wpfx;
2932 }
2933 }
2934 } else {
2935 ND_TCHECK_LEN(p, withdrawn_routes_len);
2936 if (length < withdrawn_routes_len)
2937 goto trunc;
2938 p += withdrawn_routes_len;
2939 length -= withdrawn_routes_len;
2940 }
2941
2942 ND_TCHECK_2(p);
2943 if (length < 2)
2944 goto trunc;
2945 len = GET_BE_U_2(p);
2946 p += 2;
2947 length -= 2;
2948
2949 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2950 /* No withdrawn routes, no path attributes, no NLRI */
2951 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2952 return;
2953 }
2954
2955 if (len) {
2956 /* Make sure the path attributes don't go past the end of the packet */
2957 if (length < len)
2958 goto trunc;
2959 /* do something more useful!*/
2960 while (len) {
2961 uint8_t aflags, atype, alenlen;
2962 uint16_t alen;
2963
2964 ND_TCHECK_2(p);
2965 if (length < 2)
2966 goto trunc;
2967 if (len < 2) {
2968 ND_PRINT("\n\t [path attrs too short]");
2969 p += len;
2970 length -= len;
2971 break;
2972 }
2973 aflags = GET_U_1(p);
2974 atype = GET_U_1(p + 1);
2975 p += 2;
2976 len -= 2;
2977 length -= 2;
2978 alenlen = bgp_attr_lenlen(aflags, p);
2979 ND_TCHECK_LEN(p, alenlen);
2980 if (length < alenlen)
2981 goto trunc;
2982 if (len < alenlen) {
2983 ND_PRINT("\n\t [path attrs too short]");
2984 p += len;
2985 length -= len;
2986 break;
2987 }
2988 alen = bgp_attr_len(aflags, p);
2989 p += alenlen;
2990 len -= alenlen;
2991 length -= alenlen;
2992
2993 ND_PRINT("\n\t %s (%u), length: %u",
2994 tok2str(bgp_attr_values, "Unknown Attribute", atype),
2995 atype,
2996 alen);
2997
2998 if (aflags) {
2999 ND_PRINT(", Flags [%s",
3000 bittok2str_nosep(bgp_flags, "", aflags));
3001 if (aflags & 0xf)
3002 ND_PRINT("+%x", aflags & 0xf);
3003 ND_PRINT("]: ");
3004 }
3005 if (len < alen) {
3006 ND_PRINT(" [path attrs too short]");
3007 p += len;
3008 length -= len;
3009 break;
3010 }
3011 if (length < alen)
3012 goto trunc;
3013 if (!bgp_attr_print(ndo, atype, p, alen, 0))
3014 goto trunc;
3015 p += alen;
3016 len -= alen;
3017 length -= alen;
3018 }
3019 }
3020
3021 if (length) {
3022 add_path = check_add_path(ndo, p, length, 32);
3023 ND_PRINT("\n\t Updated routes:");
3024 while (length != 0) {
3025 if (add_path) {
3026 ND_TCHECK_4(p);
3027 if (length < 4)
3028 goto trunc;
3029 path_id = GET_BE_U_4(p);
3030 p += 4;
3031 length -= 4;
3032 }
3033 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
3034 if (i == -1) {
3035 ND_PRINT("\n\t (illegal prefix length)");
3036 break;
3037 } else if (i == -2)
3038 goto trunc; /* bytes left, but not enough */
3039 else {
3040 ND_PRINT("\n\t %s", buf);
3041 if (add_path) {
3042 ND_PRINT(" Path Id: %u", path_id);
3043 }
3044 p += i;
3045 length -= i;
3046 }
3047 }
3048 }
3049 return;
3050 trunc:
3051 nd_print_trunc(ndo);
3052 }
3053
3054 static void
3055 bgp_notification_print_code(netdissect_options *ndo,
3056 const u_char *dat, u_int length,
3057 uint8_t bgpn_major, uint8_t bgpn_minor)
3058 {
3059 ND_PRINT(", %s (%u)",
3060 tok2str(bgp_notify_major_values, "Unknown Error",
3061 bgpn_major),
3062 bgpn_major);
3063
3064 switch (bgpn_major) {
3065
3066 case BGP_NOTIFY_MAJOR_MSG:
3067 ND_PRINT(", subcode %s (%u)",
3068 tok2str(bgp_notify_minor_msg_values, "Unknown",
3069 bgpn_minor),
3070 bgpn_minor);
3071 break;
3072 case BGP_NOTIFY_MAJOR_OPEN:
3073 ND_PRINT(", subcode %s (%u)",
3074 tok2str(bgp_notify_minor_open_values, "Unknown",
3075 bgpn_minor),
3076 bgpn_minor);
3077 break;
3078 case BGP_NOTIFY_MAJOR_UPDATE:
3079 ND_PRINT(", subcode %s (%u)",
3080 tok2str(bgp_notify_minor_update_values, "Unknown",
3081 bgpn_minor),
3082 bgpn_minor);
3083 break;
3084 case BGP_NOTIFY_MAJOR_FSM:
3085 ND_PRINT(" subcode %s (%u)",
3086 tok2str(bgp_notify_minor_fsm_values, "Unknown",
3087 bgpn_minor),
3088 bgpn_minor);
3089 break;
3090 case BGP_NOTIFY_MAJOR_ROUTEREFRESH:
3091 ND_PRINT(" subcode %s (%u)",
3092 tok2str(bgp_notify_minor_routerefresh_values, "Unknown",
3093 bgpn_minor),
3094 bgpn_minor);
3095 break;
3096 case BGP_NOTIFY_MAJOR_CEASE:
3097 ND_PRINT(", subcode %s (%u)",
3098 tok2str(bgp_notify_minor_cease_values, "Unknown",
3099 bgpn_minor),
3100 bgpn_minor);
3101
3102 /* RFC 4486 mentions optionally 7 bytes
3103 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
3104 */
3105 if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= 7) {
3106 ND_PRINT(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
3107 tok2str(af_values, "Unknown", GET_BE_U_2(dat)),
3108 GET_BE_U_2(dat),
3109 tok2str(bgp_safi_values, "Unknown", GET_U_1((dat + 2))),
3110 GET_U_1((dat + 2)),
3111 GET_BE_U_4(dat + 3));
3112 }
3113 /*
3114 * RFC 9003 describes a method to send a communication
3115 * intended for human consumption regarding the Administrative Shutdown
3116 */
3117 if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
3118 bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
3119 length >= 1) {
3120 uint8_t shutdown_comm_length = GET_U_1(dat);
3121 uint8_t remainder_offset = 0;
3122 /* garbage, hexdump it all */
3123 if (shutdown_comm_length > length - 1) {
3124 ND_PRINT(", invalid Shutdown Communication length");
3125 } else if (shutdown_comm_length == 0) {
3126 ND_PRINT(", empty Shutdown Communication");
3127 remainder_offset += 1;
3128 }
3129 /* a proper shutdown communication */
3130 else {
3131 ND_PRINT(", Shutdown Communication (length: %u): \"", shutdown_comm_length);
3132 nd_printjn(ndo, dat+1, shutdown_comm_length);
3133 ND_PRINT("\"");
3134 remainder_offset += shutdown_comm_length + 1;
3135 }
3136 /* if there is trailing data, hexdump it */
3137 if(length - remainder_offset > 0) {
3138 ND_PRINT(", Data: (length: %u)", length - remainder_offset);
3139 hex_print(ndo, "\n\t\t", dat + remainder_offset, length - remainder_offset);
3140 }
3141 }
3142 /*
3143 * RFC8538 describes the Hard Reset cease subcode, which contains another
3144 * notification code and subcode.
3145 */
3146 if (bgpn_minor == BGP_NOTIFY_MINOR_CEASE_HARDRESET && length >= 2) {
3147 bgpn_major = GET_U_1(dat++);
3148 bgpn_minor = GET_U_1(dat++);
3149 length -= 2;
3150 bgp_notification_print_code(ndo, dat, length, bgpn_major, bgpn_minor);
3151 }
3152 break;
3153 default:
3154 if (bgpn_minor != 0) {
3155 ND_PRINT(", subcode %u", bgpn_minor);
3156 }
3157 break;
3158 }
3159
3160 return;
3161 }
3162
3163 static void
3164 bgp_notification_print(netdissect_options *ndo,
3165 const u_char *dat, u_int length)
3166 {
3167 const struct bgp_notification *bgp_notification_header;
3168 uint8_t bgpn_major, bgpn_minor;
3169
3170 ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
3171 if (length<BGP_NOTIFICATION_SIZE)
3172 return;
3173
3174 bgp_notification_header = (const struct bgp_notification *)dat;
3175 bgpn_major = GET_U_1(bgp_notification_header->bgpn_major);
3176 bgpn_minor = GET_U_1(bgp_notification_header->bgpn_minor);
3177 bgp_notification_print_code(ndo, dat + BGP_NOTIFICATION_SIZE,
3178 length - BGP_NOTIFICATION_SIZE, bgpn_major, bgpn_minor);
3179 return;
3180 trunc:
3181 nd_print_trunc(ndo);
3182 }
3183
3184 static void
3185 bgp_route_refresh_print(netdissect_options *ndo,
3186 const u_char *pptr, u_int len)
3187 {
3188 const struct bgp_route_refresh *bgp_route_refresh_header;
3189
3190 /* some little sanity checking */
3191 if (len<BGP_ROUTE_REFRESH_SIZE)
3192 return;
3193
3194 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
3195
3196 ND_PRINT("\n\t AFI %s (%u), SAFI %s (%u), Subtype %s (%u)",
3197 tok2str(af_values, "Unknown",
3198 GET_BE_U_2(bgp_route_refresh_header->afi)),
3199 GET_BE_U_2(bgp_route_refresh_header->afi),
3200 tok2str(bgp_safi_values, "Unknown",
3201 GET_U_1(bgp_route_refresh_header->safi)),
3202 GET_U_1(bgp_route_refresh_header->safi),
3203 tok2str(bgp_route_refresh_subtype_values, "Unknown",
3204 GET_U_1(bgp_route_refresh_header->subtype)),
3205 GET_U_1(bgp_route_refresh_header->subtype));
3206
3207 /* ORF */
3208 if (len >= BGP_ROUTE_REFRESH_SIZE_ORF) {
3209 const struct bgp_route_refresh_orf *orf_header;
3210
3211 orf_header =
3212 (const struct bgp_route_refresh_orf *)(pptr + BGP_ROUTE_REFRESH_SIZE);
3213
3214 ND_PRINT("\n\t ORF refresh %s (%u), ORF type %s (%u), ORF length %u",
3215 tok2str(bgp_orf_refresh_type, "Unknown",
3216 GET_U_1(orf_header->refresh)),
3217 GET_U_1(orf_header->refresh),
3218 tok2str(bgp_orf_type, "Unknown", GET_U_1(orf_header->type)),
3219 GET_U_1(orf_header->type), GET_BE_U_2(orf_header->len));
3220 }
3221
3222 if (ndo->ndo_vflag > 1) {
3223 ND_TCHECK_LEN(pptr, len);
3224 print_unknown_data(ndo, pptr, "\n\t ", len);
3225 }
3226
3227 return;
3228 trunc:
3229 nd_print_trunc(ndo);
3230 }
3231
3232 static int
3233 bgp_pdu_print(netdissect_options *ndo,
3234 const u_char *dat, u_int length)
3235 {
3236 const struct bgp *bgp_header;
3237 uint8_t bgp_type;
3238
3239 ND_TCHECK_LEN(dat, BGP_SIZE);
3240 bgp_header = (const struct bgp *)dat;
3241 bgp_type = GET_U_1(bgp_header->bgp_type);
3242
3243 ND_PRINT("\n\t%s Message (%u), length: %u",
3244 tok2str(bgp_msg_values, "Unknown", bgp_type),
3245 bgp_type,
3246 length);
3247
3248 switch (bgp_type) {
3249 case BGP_OPEN:
3250 bgp_open_print(ndo, dat, length);
3251 break;
3252 case BGP_UPDATE:
3253 bgp_update_print(ndo, dat, length);
3254 break;
3255 case BGP_NOTIFICATION:
3256 bgp_notification_print(ndo, dat, length);
3257 break;
3258 case BGP_KEEPALIVE:
3259 break;
3260 case BGP_ROUTE_REFRESH:
3261 bgp_route_refresh_print(ndo, dat, length);
3262 break;
3263 default:
3264 /* we have no decoder for the BGP message */
3265 ND_TCHECK_LEN(dat, length);
3266 ND_PRINT("\n\t no Message %u decoder", bgp_type);
3267 print_unknown_data(ndo, dat, "\n\t ", length);
3268 break;
3269 }
3270 return 1;
3271 trunc:
3272 nd_print_trunc(ndo);
3273 return 0;
3274 }
3275
3276 void
3277 bgp_print(netdissect_options *ndo,
3278 const u_char *dat, u_int length _U_)
3279 {
3280 const u_char *p;
3281 const u_char *ep = ndo->ndo_snapend;
3282 const u_char *start;
3283 const u_char marker[] = {
3284 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3285 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3286 };
3287 const struct bgp *bgp_header;
3288 uint16_t hlen;
3289
3290 ndo->ndo_protocol = "bgp";
3291 ND_PRINT(": BGP");
3292
3293 if (ndo->ndo_vflag < 1) /* lets be less chatty */
3294 return;
3295
3296 p = dat;
3297 start = p;
3298 while (p < ep) {
3299 if (!ND_TTEST_1(p))
3300 break;
3301 if (GET_U_1(p) != 0xff) {
3302 p++;
3303 continue;
3304 }
3305
3306 if (!ND_TTEST_LEN(p, sizeof(marker)))
3307 break;
3308 if (memcmp(p, marker, sizeof(marker)) != 0) {
3309 p++;
3310 continue;
3311 }
3312
3313 /* found BGP header */
3314 ND_TCHECK_LEN(p, BGP_SIZE);
3315 bgp_header = (const struct bgp *)p;
3316
3317 if (start != p)
3318 nd_print_trunc(ndo);
3319
3320 hlen = GET_BE_U_2(bgp_header->bgp_len);
3321 if (hlen < BGP_SIZE) {
3322 ND_PRINT("\nmessage length %u < %u", hlen, BGP_SIZE);
3323 nd_print_invalid(ndo);
3324 break;
3325 }
3326
3327 if (ND_TTEST_LEN(p, hlen)) {
3328 if (!bgp_pdu_print(ndo, p, hlen))
3329 return;
3330 p += hlen;
3331 start = p;
3332 } else {
3333 ND_PRINT("\n[|BGP %s]",
3334 tok2str(bgp_msg_values,
3335 "Unknown Message Type",
3336 GET_U_1(bgp_header->bgp_type)));
3337 break;
3338 }
3339 }
3340
3341 return;
3342
3343 trunc:
3344 nd_print_trunc(ndo);
3345 }
[mirror] the TCPdump network dissector