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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 #ifdef HAVE_CONFIG_H
38 #include <config.h>
39 #endif
40
41 #include "netdissect-stdinc.h"
42
43 #include <stdio.h>
44 #include <string.h>
45
46 #include "netdissect.h"
47 #include "addrtoname.h"
48 #include "extract.h"
49 #include "af.h"
50 #include "l2vpn.h"
51
52 struct bgp {
53 nd_byte bgp_marker[16];
54 nd_uint16_t bgp_len;
55 nd_uint8_t bgp_type;
56 };
57 #define BGP_SIZE 19 /* unaligned */
58
59 #define BGP_OPEN 1
60 #define BGP_UPDATE 2
61 #define BGP_NOTIFICATION 3
62 #define BGP_KEEPALIVE 4
63 #define BGP_ROUTE_REFRESH 5
64
65 static const struct tok bgp_msg_values[] = {
66 { BGP_OPEN, "Open"},
67 { BGP_UPDATE, "Update"},
68 { BGP_NOTIFICATION, "Notification"},
69 { BGP_KEEPALIVE, "Keepalive"},
70 { BGP_ROUTE_REFRESH, "Route Refresh"},
71 { 0, NULL}
72 };
73
74 struct bgp_open {
75 nd_byte bgpo_marker[16];
76 nd_uint16_t bgpo_len;
77 nd_uint8_t bgpo_type;
78 nd_uint8_t bgpo_version;
79 nd_uint16_t bgpo_myas;
80 nd_uint16_t bgpo_holdtime;
81 nd_uint32_t bgpo_id;
82 nd_uint8_t bgpo_optlen;
83 nd_uint8_t bgpo_opttype; /* RFC9072 */
84 nd_uint16_t bgpo_optlen_extended; /* RFC9072 */
85 /* options should follow */
86 };
87 #define BGP_OPEN_SIZE 29 /* unaligned */
88
89 struct bgp_opt {
90 nd_uint8_t bgpopt_type;
91 nd_uint16_t bgpopt_len; /* Can be one or two bytes, depending on RFC9072 */
92 /* variable length */
93 };
94 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
95 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
96
97 struct bgp_notification {
98 nd_byte bgpn_marker[16];
99 nd_uint16_t bgpn_len;
100 nd_uint8_t bgpn_type;
101 nd_uint8_t bgpn_major;
102 nd_uint8_t bgpn_minor;
103 };
104 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
105
106 struct bgp_route_refresh_orf {
107 nd_uint8_t refresh;
108 nd_uint8_t type;
109 nd_uint16_t len;
110 };
111
112 struct bgp_route_refresh {
113 nd_byte bgp_marker[16];
114 nd_uint16_t len;
115 nd_uint8_t type; /* No padding after this; afi is, in fact, not aligned */
116 nd_uint16_t afi;
117 nd_uint8_t subtype;
118 nd_uint8_t safi;
119 };
120
121 static const struct tok bgp_orf_refresh_type[] = {
122 { 1, "Immediate"},
123 { 2, "Defer"},
124 { 0, NULL }
125 };
126
127 static const struct tok bgp_orf_type[] = {
128 { 64, "Address Prefix ORF"},
129 { 65, "CP-ORF"},
130 { 0, NULL }
131 };
132
133 #define BGP_ROUTE_REFRESH_SIZE 23
134 #define BGP_ROUTE_REFRESH_SIZE_ORF BGP_ROUTE_REFRESH_SIZE + 5
135 #define BGP_ROUTE_REFRESH_SUBTYPE_NORMAL 0
136 #define BGP_ROUTE_REFRESH_SUBTYPE_BORR 1
137 #define BGP_ROUTE_REFRESH_SUBTYPE_EORR 2
138 #define BGP_ROUTE_REFRESH_SUBTYPE_RESERVED 255
139
140 static const struct tok bgp_route_refresh_subtype_values[] = {
141 {BGP_ROUTE_REFRESH_SUBTYPE_NORMAL, "Normal route refresh request"},
142 {BGP_ROUTE_REFRESH_SUBTYPE_BORR,
143 "Demarcation of the beginning of a route refresh"},
144 {BGP_ROUTE_REFRESH_SUBTYPE_EORR,
145 "Demarcation of the ending of a route refresh"},
146 {0, NULL}};
147
148 #define bgp_attr_lenlen(flags, p) \
149 (((flags) & 0x10) ? 2U : 1U)
150 #define bgp_attr_len(flags, p) \
151 (((flags) & 0x10) ? GET_BE_U_2(p) : GET_U_1(p))
152
153 #define BGPTYPE_ORIGIN 1
154 #define BGPTYPE_AS_PATH 2
155 #define BGPTYPE_NEXT_HOP 3
156 #define BGPTYPE_MULTI_EXIT_DISC 4
157 #define BGPTYPE_LOCAL_PREF 5
158 #define BGPTYPE_ATOMIC_AGGREGATE 6
159 #define BGPTYPE_AGGREGATOR 7
160 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
161 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */
162 #define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */
163 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */
164 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */
165 #define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */
166 #define BGPTYPE_AS4_PATH 17 /* RFC6793 */
167 #define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */
168 #define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */
169 #define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */
170 #define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */
171 #define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */
172 #define BGPTYPE_AIGP 26 /* RFC7311 */
173 #define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */
174 #define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */
175 #define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */
176 #define BGPTYPE_BGPSEC_PATH 33 /* RFC8205 */
177 #define BGPTYPE_OTC 35 /* RFC9234 */
178 #define BGPTYPE_ATTR_SET 128 /* RFC6368 */
179
180 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
181
182 static const struct tok bgp_attr_values[] = {
183 { BGPTYPE_ORIGIN, "Origin"},
184 { BGPTYPE_AS_PATH, "AS Path"},
185 { BGPTYPE_AS4_PATH, "AS4 Path"},
186 { BGPTYPE_NEXT_HOP, "Next Hop"},
187 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
188 { BGPTYPE_LOCAL_PREF, "Local Preference"},
189 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
190 { BGPTYPE_AGGREGATOR, "Aggregator"},
191 { BGPTYPE_AGGREGATOR4, "Aggregator4"},
192 { BGPTYPE_COMMUNITIES, "Community"},
193 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
194 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
195 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
196 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
197 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
198 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
199 { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"},
200 { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"},
201 { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
202 { BGPTYPE_AIGP, "Accumulated IGP Metric"},
203 { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
204 { BGPTYPE_ENTROPY_LABEL, "Entropy Label"},
205 { BGPTYPE_LARGE_COMMUNITY, "Large Community"},
206 { BGPTYPE_BGPSEC_PATH, "BGPsec Path"},
207 { BGPTYPE_OTC, "Only to Customer (OTC)"},
208 { BGPTYPE_ATTR_SET, "Attribute Set"},
209 { 255, "Reserved for development"},
210 { 0, NULL}
211 };
212
213 #define BGP_AS_SET 1
214 #define BGP_AS_SEQUENCE 2
215 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
216 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
217
218 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
219 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
220
221 static const struct tok bgp_as_path_segment_open_values[] = {
222 { BGP_AS_SEQUENCE, ""},
223 { BGP_AS_SET, "{ "},
224 { BGP_CONFED_AS_SEQUENCE, "( "},
225 { BGP_CONFED_AS_SET, "({ "},
226 { 0, NULL}
227 };
228
229 static const struct tok bgp_as_path_segment_close_values[] = {
230 { BGP_AS_SEQUENCE, ""},
231 { BGP_AS_SET, "}"},
232 { BGP_CONFED_AS_SEQUENCE, ")"},
233 { BGP_CONFED_AS_SET, "})"},
234 { 0, NULL}
235 };
236
237 #define BGP_OPT_AUTH 1
238 #define BGP_OPT_CAP 2
239
240 static const struct tok bgp_opt_values[] = {
241 { BGP_OPT_AUTH, "Authentication Information"},
242 { BGP_OPT_CAP, "Capabilities Advertisement"},
243 { 0, NULL}
244 };
245
246 #define BGP_CAPCODE_MP 1 /* RFC2858 */
247 #define BGP_CAPCODE_RR 2 /* RFC2918 */
248 #define BGP_CAPCODE_ORF 3 /* RFC5291 */
249 #define BGP_CAPCODE_MR 4 /* RFC3107 */
250 #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */
251 #define BGP_CAPCODE_EXT_MSG 6 /* RFC8654 */
252 #define BGP_CAPCODE_BGPSEC 7 /* RFC8205 */
253 #define BGP_CAPCODE_ML 8 /* RFC8277 */
254 #define BGP_CAPCODE_ROLE 9 /* RFC9234 */
255 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */
256 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
257 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
258 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
259 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
260 #define BGP_CAPCODE_ENH_RR 70 /* RFC7313 */
261 #define BGP_CAPCODE_LLGR 71 /* draft-uttaro-idr-bgp-persistence-05 */
262 #define BGP_CAPCODE_RR_CISCO 128
263
264 static const struct tok bgp_capcode_values[] = {
265 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
266 { BGP_CAPCODE_RR, "Route Refresh"},
267 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
268 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
269 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
270 { BGP_CAPCODE_EXT_MSG, "BGP Extended Message"},
271 { BGP_CAPCODE_BGPSEC, "BGPsec"},
272 { BGP_CAPCODE_ML, "Multiple Labels"},
273 { BGP_CAPCODE_RESTART, "Graceful Restart"},
274 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
275 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
276 { BGP_CAPCODE_MULTISESS, "Multisession BGP"},
277 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
278 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
279 { BGP_CAPCODE_LLGR, "Long-lived Graceful Restart"},
280 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
281 { BGP_CAPCODE_ROLE, "Role Capability"},
282 { 0, NULL}
283 };
284
285 #define BGP_NOTIFY_MAJOR_MSG 1
286 #define BGP_NOTIFY_MAJOR_OPEN 2
287 #define BGP_NOTIFY_MAJOR_UPDATE 3
288 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
289 #define BGP_NOTIFY_MAJOR_FSM 5
290 #define BGP_NOTIFY_MAJOR_CEASE 6
291 #define BGP_NOTIFY_MAJOR_ROUTEREFRESH 7
292 #define BGP_NOTIFY_MAJOR_SENDHOLDTIME 8
293
294 static const struct tok bgp_notify_major_values[] = {
295 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
296 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
297 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
298 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
299 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
300 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
301 { BGP_NOTIFY_MAJOR_ROUTEREFRESH, "ROUTE-REFRESH Message Error"},
302 { BGP_NOTIFY_MAJOR_SENDHOLDTIME, "Send Hold Timer Expired"},
303 { 0, NULL}
304 };
305
306 /* RFC 4486 */
307 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
308 /* RFC 9003 */
309 #define BGP_NOTIFY_MINOR_CEASE_SHUT 2
310 #define BGP_NOTIFY_MINOR_CEASE_RESET 4
311 /* RFC 8538 */
312 #define BGP_NOTIFY_MINOR_CEASE_HARDRESET 9
313 static const struct tok bgp_notify_minor_cease_values[] = {
314 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
315 { BGP_NOTIFY_MINOR_CEASE_SHUT, "Administrative Shutdown"},
316 { 3, "Peer Unconfigured"},
317 { BGP_NOTIFY_MINOR_CEASE_RESET, "Administrative Reset"},
318 { 5, "Connection Rejected"},
319 { 6, "Other Configuration Change"},
320 { 7, "Connection Collision Resolution"},
321 { 8, "Out of Resources"},
322 { BGP_NOTIFY_MINOR_CEASE_HARDRESET, "Hard Reset"},
323 { 10, "BFD Down"},
324 { 0, NULL}
325 };
326
327 static const struct tok bgp_notify_minor_msg_values[] = {
328 { 1, "Connection Not Synchronized"},
329 { 2, "Bad Message Length"},
330 { 3, "Bad Message Type"},
331 { 0, NULL}
332 };
333
334 static const struct tok bgp_notify_minor_open_values[] = {
335 { 1, "Unsupported Version Number"},
336 { 2, "Bad Peer AS"},
337 { 3, "Bad BGP Identifier"},
338 { 4, "Unsupported Optional Parameter"},
339 { 5, "Authentication Failure"},
340 { 6, "Unacceptable Hold Time"},
341 { 7, "Capability Message Error"},
342 { 0, NULL}
343 };
344
345 static const struct tok bgp_notify_minor_update_values[] = {
346 { 1, "Malformed Attribute List"},
347 { 2, "Unrecognized Well-known Attribute"},
348 { 3, "Missing Well-known Attribute"},
349 { 4, "Attribute Flags Error"},
350 { 5, "Attribute Length Error"},
351 { 6, "Invalid ORIGIN Attribute"},
352 { 7, "AS Routing Loop"},
353 { 8, "Invalid NEXT_HOP Attribute"},
354 { 9, "Optional Attribute Error"},
355 { 10, "Invalid Network Field"},
356 { 11, "Malformed AS_PATH"},
357 { 0, NULL}
358 };
359
360 static const struct tok bgp_notify_minor_fsm_values[] = {
361 { 0, "Unspecified Error"},
362 { 1, "In OpenSent State"},
363 { 2, "In OpenConfirm State"},
364 { 3, "In Established State"},
365 { 0, NULL }
366 };
367
368 static const struct tok bgp_notify_minor_routerefresh_values[] = {
369 { 1, "Invalid Message Length" },
370 { 0, NULL }
371 };
372
373 static const struct tok bgp_origin_values[] = {
374 { 0, "IGP"},
375 { 1, "EGP"},
376 { 2, "Incomplete"},
377 { 0, NULL}
378 };
379
380 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1
381 #define BGP_PMSI_TUNNEL_LDP_P2MP 2
382 #define BGP_PMSI_TUNNEL_PIM_SSM 3
383 #define BGP_PMSI_TUNNEL_PIM_SM 4
384 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5
385 #define BGP_PMSI_TUNNEL_INGRESS 6
386 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7
387
388 static const struct tok bgp_pmsi_tunnel_values[] = {
389 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
390 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
391 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
392 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
393 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
394 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
395 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
396 { 0, NULL}
397 };
398
399 static const struct tok bgp_pmsi_flag_values[] = {
400 { 0x01, "Leaf Information required"},
401 { 0, NULL}
402 };
403
404 #define BGP_AIGP_TLV 1
405
406 static const struct tok bgp_aigp_values[] = {
407 { BGP_AIGP_TLV, "AIGP"},
408 { 0, NULL}
409 };
410
411 #define BGP_ROLE_PROVIDER 0
412 #define BGP_ROLE_RS 1
413 #define BGP_ROLE_RS_CLIENT 2
414 #define BGP_ROLE_CUSTOMER 3
415 #define BGP_ROLE_PEER 4
416
417 static const struct tok bgp_role_values[] = {
418 { BGP_ROLE_PROVIDER, "Provider"},
419 { BGP_ROLE_RS, "RS"},
420 { BGP_ROLE_RS_CLIENT, "RS-Client"},
421 { BGP_ROLE_CUSTOMER, "Customer"},
422 { BGP_ROLE_PEER, "Peer"},
423 { 0, NULL}
424 };
425
426 /* Subsequent address family identifier, RFC2283 section 7 */
427 #define SAFNUM_RES 0
428 #define SAFNUM_UNICAST 1
429 #define SAFNUM_MULTICAST 2
430 #define SAFNUM_UNIMULTICAST 3 /* deprecated now */
431 /* labeled BGP RFC3107 */
432 #define SAFNUM_LABUNICAST 4
433 /* RFC6514 */
434 #define SAFNUM_MULTICAST_VPN 5
435 /* draft-nalawade-kapoor-tunnel-safi */
436 #define SAFNUM_TUNNEL 64
437 /* RFC4761 */
438 #define SAFNUM_VPLS 65
439 /* RFC6037 */
440 #define SAFNUM_MDT 66
441 /* RFC7432 */
442 #define SAFNUM_EVPN 70
443 /* RFC4364 */
444 #define SAFNUM_VPNUNICAST 128
445 /* RFC6513 */
446 #define SAFNUM_VPNMULTICAST 129
447 #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */
448 /* RFC4684 */
449 #define SAFNUM_RT_ROUTING_INFO 132
450
451 #define BGP_VPN_RD_LEN 8
452
453 static const struct tok bgp_safi_values[] = {
454 { SAFNUM_RES, "Reserved"},
455 { SAFNUM_UNICAST, "Unicast"},
456 { SAFNUM_MULTICAST, "Multicast"},
457 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
458 { SAFNUM_LABUNICAST, "labeled Unicast"},
459 { SAFNUM_TUNNEL, "Tunnel"},
460 { SAFNUM_VPLS, "VPLS"},
461 { SAFNUM_MDT, "MDT"},
462 { SAFNUM_EVPN, "EVPN"},
463 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
464 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
465 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
466 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
467 { SAFNUM_MULTICAST_VPN, "Multicast VPN"},
468 { 0, NULL }
469 };
470
471 static const struct tok bgp_graceful_restart_comm_flag_values[] = {
472 { 0x8, "R" },
473 { 0x4, "N" },
474 { 0, NULL }
475 };
476
477 /* well-known community */
478 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
479 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
480 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
481
482 /* Extended community type - RFC 4360 */
483 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
484 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
485 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
486 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
487 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
488 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
489 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
490 #define BGP_EXT_COM_OVS 0x4300 /* BGP Prefix Origin Validation State Extended Community */
491 /* rfc2547 bgp-mpls-vpns */
492 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
493 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatibility */
494 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatibility */
495 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatibility */
496
497 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
498 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatibility */
499 #define BGP_EXT_COM_ENCAP 0x030c /* rfc5512 */
500
501 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
502 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatibility */
503
504 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
505
506 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
507 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
508 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
509 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */
510
511 /* https://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */
512 #define BGP_EXT_COM_EIGRP_GEN 0x8800
513 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801
514 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
515 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803
516 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804
517 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
518
519 /* Optional Parameters */
520 #define BGP_OPEN_NON_EXT_OPT_TYPE_EXTENDED_LENGTH 255 /* Non-Ext OP Type */
521
522 static const struct tok bgp_extd_comm_flag_values[] = {
523 { 0x8000, "vendor-specific"},
524 { 0x4000, "non-transitive"},
525 { 0, NULL},
526 };
527
528 /* rfc8097 */
529 static const struct tok bgp_prefix_origin_validation_state[] = {
530 { 0, "valid" },
531 { 1, "not found" },
532 { 2, "invalid" },
533 { 0, NULL },
534 };
535
536 static const struct tok bgp_extd_comm_subtype_values[] = {
537 { BGP_EXT_COM_RT_0, "target"},
538 { BGP_EXT_COM_RT_1, "target"},
539 { BGP_EXT_COM_RT_2, "target"},
540 { BGP_EXT_COM_RO_0, "origin"},
541 { BGP_EXT_COM_RO_1, "origin"},
542 { BGP_EXT_COM_RO_2, "origin"},
543 { BGP_EXT_COM_LINKBAND, "link-BW"},
544 { BGP_EXT_COM_OVS, "origin-validation-state"},
545 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
546 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
547 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
548 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
549 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
550 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
551 { BGP_EXT_COM_ENCAP, "encapsulation"},
552 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
553 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
554 { BGP_EXT_COM_L2INFO, "layer2-info"},
555 { BGP_EXT_COM_EIGRP_GEN, "eigrp-general-route (flag, tag)" },
556 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY, "eigrp-route-metric (AS, delay)" },
557 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW, "eigrp-route-metric (reliability, nexthop, bandwidth)" },
558 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU, "eigrp-route-metric (load, MTU)" },
559 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID, "eigrp-external-route (remote-AS, remote-ID)" },
560 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC, "eigrp-external-route (remote-proto, remote-metric)" },
561 { BGP_EXT_COM_SOURCE_AS, "source-AS" },
562 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
563 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
564 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
565 { 0, NULL},
566 };
567
568 /* RFC RFC5512 BGP Tunnel Encapsulation Attribute Tunnel Types */
569 #define BGP_ENCAP_TUNNEL_L2TPV3_IP 1
570 #define BGP_ENCAP_TUNNEL_GRE 2
571 #define BGP_ENCAP_TUNNEL_TRANSMIT 3
572 #define BGP_ENCAP_TUNNEL_IPSEC 4
573 #define BGP_ENCAP_TUNNEL_IP_IPSEC 5
574 #define BGP_ENCAP_TUNNEL_MPLS_IP 6
575 #define BGP_ENCAP_TUNNEL_IP_IP 7
576 #define BGP_ENCAP_TUNNEL_VXLAN 8
577 #define BGP_ENCAP_TUNNEL_NVGRE 9
578 #define BGP_ENCAP_TUNNEL_MPLS 10
579 #define BGP_ENCAP_TUNNEL_MPLS_GRE 11
580 #define BGP_ENCAP_TUNNEL_VXLAN_GPE 12
581 #define BGP_ENCAP_TUNNEL_MPLS_UDP 13
582 #define BGP_ENCAP_TUNNEL_IPV6 14
583 #define BGP_ENCAP_TUNNEL_SR_TE 15
584 #define BGP_ENCAP_TUNNEL_BARE 16
585 #define BGP_ENCAP_TUNNEL_SR 17
586
587 static const struct tok bgp_extd_comm_encap_tunnel_values[] = {
588 { BGP_ENCAP_TUNNEL_L2TPV3_IP, "L2TPv3 over IP"},
589 { BGP_ENCAP_TUNNEL_GRE, "GRE"},
590 { BGP_ENCAP_TUNNEL_TRANSMIT, "Transmit Tunnel"},
591 { BGP_ENCAP_TUNNEL_IPSEC, "IPsec"},
592 { BGP_ENCAP_TUNNEL_IP_IPSEC, "IP in IP with IPsec"},
593 { BGP_ENCAP_TUNNEL_MPLS_IP, "MPLS in IP with IPsec"},
594 { BGP_ENCAP_TUNNEL_IP_IP, "IP in IP"},
595 { BGP_ENCAP_TUNNEL_VXLAN, "VXLAN"},
596 { BGP_ENCAP_TUNNEL_NVGRE, "NVGRE"},
597 { BGP_ENCAP_TUNNEL_MPLS, "MPLS"},
598 { BGP_ENCAP_TUNNEL_MPLS_GRE, "MPLS in GRE"},
599 { BGP_ENCAP_TUNNEL_VXLAN_GPE, "VXLAN GPE"},
600 { BGP_ENCAP_TUNNEL_MPLS_UDP, "MPLS in UDP"},
601 { BGP_ENCAP_TUNNEL_IPV6, "IPv6"},
602 { BGP_ENCAP_TUNNEL_SR_TE, "SR TE"},
603 { BGP_ENCAP_TUNNEL_BARE, "Bare"},
604 { BGP_ENCAP_TUNNEL_SR, "SR"},
605 { 0, NULL},
606 };
607
608 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
609 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
610 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
611 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
612 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
613 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
614 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
615 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
616
617 static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
618 { BGP_OSPF_RTYPE_RTR, "Router" },
619 { BGP_OSPF_RTYPE_NET, "Network" },
620 { BGP_OSPF_RTYPE_SUM, "Summary" },
621 { BGP_OSPF_RTYPE_EXT, "External" },
622 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
623 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
624 { 0, NULL },
625 };
626
627 /* ADD-PATH Send/Receive field values */
628 static const struct tok bgp_add_path_recvsend[] = {
629 { 1, "Receive" },
630 { 2, "Send" },
631 { 3, "Both" },
632 { 0, NULL },
633 };
634
635 static const struct tok bgp_bgpsec_bitmap_str[] = {
636 { 1U << 0, "MBZ-0" },
637 { 1U << 1, "MBZ-1" },
638 { 1U << 2, "MBZ-2" },
639 { 1U << 3, "MBZ-3" },
640 { 1U << 4, "MBZ-4" },
641 { 1U << 5, "MBZ-5" },
642 { 1U << 6, "MBZ-6" },
643 { 1U << 7, "C" },
644 { 0, NULL}
645 };
646
647 #define AS_STR_SIZE sizeof("xxxxx.xxxxx")
648
649 /*
650 * as_printf
651 *
652 * Convert an AS number into a string and return string pointer.
653 *
654 * Depending on bflag is set or not, AS number is converted into ASDOT notation
655 * or plain number notation.
656 *
657 */
658 static char *
659 as_printf(netdissect_options *ndo,
660 char *str, size_t size, u_int asnum)
661 {
662 if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
663 snprintf(str, size, "%u", asnum);
664 } else {
665 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
666 }
667 return str;
668 }
669
670 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
671
672 int
673 decode_prefix4(netdissect_options *ndo,
674 const u_char *pptr, u_int itemlen, char *buf, size_t buflen)
675 {
676 nd_ipv4 addr;
677 u_int plen, plenbytes;
678
679 ITEMCHECK(1);
680 plen = GET_U_1(pptr);
681 if (32 < plen)
682 return -1;
683 itemlen -= 1;
684
685 memset(&addr, 0, sizeof(addr));
686 plenbytes = (plen + 7) / 8;
687 ITEMCHECK(plenbytes);
688 GET_CPY_BYTES(&addr, pptr + 1, plenbytes);
689 if (plen % 8) {
690 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
691 }
692 snprintf(buf, buflen, "%s/%u", ipaddr_string(ndo, (const u_char *)&addr), plen);
693 return 1 + plenbytes;
694
695 badtlv:
696 return -2;
697 }
698
699 static int
700 print_labeled_prefix4(netdissect_options *ndo,
701 const u_char *pptr, u_int itemlen)
702 {
703 nd_ipv4 addr;
704 u_int plen, plenbytes;
705
706 /* prefix length and label = 4 bytes */
707 ND_TCHECK_4(pptr);
708 ITEMCHECK(4);
709 plen = GET_U_1(pptr); /* get prefix length */
710
711 /* this is one of the weirdnesses of rfc3107
712 the label length (actually the label + COS bits)
713 is added to the prefix length;
714 we also do only read out just one label -
715 there is no real application for advertisement of
716 stacked labels in a single BGP message
717 */
718
719 if (24 > plen)
720 goto badplen;
721
722 plen-=24; /* adjust prefixlen - labellength */
723
724 if (32 < plen)
725 goto badplen;
726 itemlen -= 4;
727
728 memset(&addr, 0, sizeof(addr));
729 plenbytes = (plen + 7) / 8;
730 ITEMCHECK(plenbytes);
731 GET_CPY_BYTES(&addr, pptr + 4, plenbytes);
732 if (plen % 8) {
733 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
734 }
735 /* the label may get offsetted by 4 bits so lets shift it right */
736 ND_PRINT("\n\t %s/%u, label:%u %s",
737 ipaddr_string(ndo, (const u_char *)&addr),
738 plen,
739 GET_BE_U_3(pptr + 1)>>4,
740 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
741
742 return 4 + plenbytes;
743
744 badplen:
745 ND_PRINT("\n\t (illegal prefix length)");
746 return -1;
747
748 trunc:
749 return -2;
750
751 badtlv:
752 return -3;
753 }
754
755 /*
756 * bgp_vpn_ip_print
757 *
758 * print an ipv4 or ipv6 address into a buffer dependent on address length.
759 */
760 static char *
761 bgp_vpn_ip_print(netdissect_options *ndo,
762 const u_char *pptr, u_int addr_length)
763 {
764
765 /* worst case string is s fully formatted v6 address */
766 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
767 char *pos = addr;
768
769 switch(addr_length) {
770 case (sizeof(nd_ipv4) << 3): /* 32 */
771 snprintf(pos, sizeof(addr), "%s", GET_IPADDR_STRING(pptr));
772 break;
773 case (sizeof(nd_ipv6) << 3): /* 128 */
774 snprintf(pos, sizeof(addr), "%s", GET_IP6ADDR_STRING(pptr));
775 break;
776 default:
777 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
778 break;
779 }
780 pos += strlen(pos);
781
782 *(pos) = '\0';
783 return (addr);
784 }
785
786 /*
787 * bgp_vpn_sg_print
788 *
789 * print an multicast s,g entry into a buffer.
790 * the s,g entry is encoded like this.
791 *
792 * +-----------------------------------+
793 * | Multicast Source Length (1 octet) |
794 * +-----------------------------------+
795 * | Multicast Source (Variable) |
796 * +-----------------------------------+
797 * | Multicast Group Length (1 octet) |
798 * +-----------------------------------+
799 * | Multicast Group (Variable) |
800 * +-----------------------------------+
801 *
802 * return the number of bytes read from the wire.
803 */
804 static u_int
805 bgp_vpn_sg_print(netdissect_options *ndo, const u_char *pptr)
806 {
807 uint8_t addr_length;
808 u_int total_length;
809
810 total_length = 0;
811
812 /* Source address length, encoded in bits */
813 addr_length = GET_U_1(pptr);
814 pptr++;
815
816 /* Source address */
817 ND_TCHECK_LEN(pptr, (addr_length >> 3));
818 total_length += (addr_length >> 3) + 1;
819 if (addr_length) {
820 ND_PRINT(", Source %s",
821 bgp_vpn_ip_print(ndo, pptr, addr_length));
822 pptr += (addr_length >> 3);
823 }
824
825 /* Group address length, encoded in bits */
826 addr_length = GET_U_1(pptr);
827 pptr++;
828
829 /* Group address */
830 ND_TCHECK_LEN(pptr, (addr_length >> 3));
831 total_length += (addr_length >> 3) + 1;
832 if (addr_length) {
833 ND_PRINT(", Group %s",
834 bgp_vpn_ip_print(ndo, pptr, addr_length));
835 pptr += (addr_length >> 3);
836 }
837
838 trunc:
839 return (total_length);
840 }
841
842 /* Print an RFC 4364 Route Distinguisher */
843 const char *
844 bgp_vpn_rd_print(netdissect_options *ndo, const u_char *pptr)
845 {
846 /* allocate space for the largest possible string */
847 static char rd[sizeof("xxxxx.xxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
848 char *pos = rd;
849 /* allocate space for the largest possible string */
850 char astostr[AS_STR_SIZE];
851
852 /* ok lets load the RD format */
853 switch (GET_BE_U_2(pptr)) {
854
855 case 0:
856 /* 2-byte-AS:number fmt */
857 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
858 GET_BE_U_2(pptr + 2),
859 GET_BE_U_4(pptr + 4),
860 GET_U_1(pptr + 4), GET_U_1(pptr + 5),
861 GET_U_1(pptr + 6), GET_U_1(pptr + 7));
862 break;
863
864 case 1:
865 /* IP-address:AS fmt */
866 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
867 GET_U_1(pptr + 2), GET_U_1(pptr + 3),
868 GET_U_1(pptr + 4), GET_U_1(pptr + 5),
869 GET_BE_U_2(pptr + 6));
870 break;
871
872 case 2:
873 /* 4-byte-AS:number fmt */
874 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
875 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 2)),
876 GET_BE_U_2(pptr + 6), GET_U_1(pptr + 2),
877 GET_U_1(pptr + 3), GET_U_1(pptr + 4),
878 GET_U_1(pptr + 5), GET_BE_U_2(pptr + 6));
879 break;
880 default:
881 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
882 break;
883 }
884 pos += strlen(pos);
885 *(pos) = '\0';
886 return (rd);
887 }
888
889 /*
890 * Print an RFC 4360 Extended Community.
891 */
892 static void
893 bgp_extended_community_print(netdissect_options *ndo,
894 const u_char *pptr)
895 {
896 float bw;
897 /* allocate space for the largest possible string */
898 char astostr[AS_STR_SIZE];
899
900 switch (GET_BE_U_2(pptr)) {
901
902 case BGP_EXT_COM_RT_0:
903 case BGP_EXT_COM_RO_0:
904 case BGP_EXT_COM_L2VPN_RT_0:
905 ND_PRINT("%u:%u (= %s)",
906 GET_BE_U_2(pptr + 2),
907 GET_BE_U_4(pptr + 4),
908 GET_IPADDR_STRING(pptr+4));
909 break;
910
911 case BGP_EXT_COM_RT_1:
912 case BGP_EXT_COM_RO_1:
913 case BGP_EXT_COM_L2VPN_RT_1:
914 case BGP_EXT_COM_VRF_RT_IMP:
915 ND_PRINT("%s:%u",
916 GET_IPADDR_STRING(pptr+2),
917 GET_BE_U_2(pptr + 6));
918 break;
919
920 case BGP_EXT_COM_RT_2:
921 case BGP_EXT_COM_RO_2:
922 ND_PRINT("%s:%u",
923 as_printf(ndo, astostr, sizeof(astostr),
924 GET_BE_U_4(pptr + 2)), GET_BE_U_2(pptr + 6));
925 break;
926
927 case BGP_EXT_COM_LINKBAND:
928 bw = GET_BE_F_4(pptr + 4);
929 ND_PRINT("bandwidth: %.3f Mbps",
930 bw*8/1000000);
931 break;
932
933 case BGP_EXT_COM_OVS:
934 /* The Reserved field MUST be set to 0 and ignored upon the
935 * receipt of this community.
936 */
937 {
938 uint64_t reserved = GET_BE_U_5(pptr + 2);
939
940 if (reserved)
941 ND_PRINT("[the reserved field 0x%" PRIx64 " MUST be 0] ",
942 reserved);
943 ND_PRINT("ovs: %s",
944 tok2str(bgp_prefix_origin_validation_state,
945 "unknown origin validation state",
946 GET_U_1(pptr + 7)));
947 }
948 break;
949
950 case BGP_EXT_COM_VPN_ORIGIN:
951 case BGP_EXT_COM_VPN_ORIGIN2:
952 case BGP_EXT_COM_VPN_ORIGIN3:
953 case BGP_EXT_COM_VPN_ORIGIN4:
954 case BGP_EXT_COM_OSPF_RID:
955 case BGP_EXT_COM_OSPF_RID2:
956 ND_PRINT("%s", GET_IPADDR_STRING(pptr+2));
957 break;
958
959 case BGP_EXT_COM_OSPF_RTYPE:
960 case BGP_EXT_COM_OSPF_RTYPE2:
961 ND_PRINT("area:%s, router-type:%s, metric-type:%s%s",
962 GET_IPADDR_STRING(pptr+2),
963 tok2str(bgp_extd_comm_ospf_rtype_values,
964 "unknown (0x%02x)",
965 GET_U_1((pptr + 6))),
966 (GET_U_1(pptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
967 ((GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_EXT) || (GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "");
968 break;
969
970 case BGP_EXT_COM_L2INFO:
971 ND_PRINT("%s Control Flags [0x%02x]:MTU %u",
972 tok2str(l2vpn_encaps_values,
973 "unknown encaps",
974 GET_U_1((pptr + 2))),
975 GET_U_1((pptr + 3)),
976 GET_BE_U_2(pptr + 4));
977 break;
978
979 case BGP_EXT_COM_SOURCE_AS:
980 ND_PRINT("AS %u", GET_BE_U_2(pptr + 2));
981 break;
982
983 case BGP_EXT_COM_ENCAP:
984 ND_PRINT("Tunnel type: %s", tok2str(bgp_extd_comm_encap_tunnel_values,
985 "unknown encaps",
986 GET_BE_U_2(pptr + 6)));
987 break;
988
989 default:
990 ND_PRINT("%02x%02x%02x%02x%02x%02x",
991 GET_U_1(pptr + 2),
992 GET_U_1(pptr + 3),
993 GET_U_1(pptr + 4),
994 GET_U_1(pptr + 5),
995 GET_U_1(pptr + 6),
996 GET_U_1(pptr + 7));
997 break;
998 }
999 }
1000
1001 /*
1002 * RFC4684 (Section 4)/RFC2858 (Section 4).
1003 * RTC membership prefix is structured as follows
1004 * [prefix-len] [origin-as] [route-target]
1005 * The route-target is encoded as RT ext-comms.
1006 * Prefix-len may be 0, 32..96
1007 *
1008 * Note that pptr is not packet data - it is
1009 * a buffer owned by our caller - therefore GET_*
1010 * macros can not be used.
1011 */
1012 static char *
1013 bgp_rt_prefix_print(netdissect_options *ndo,
1014 const u_char *pptr,
1015 u_int plen)
1016 {
1017 /* allocate space for the largest possible string */
1018 char rtc_prefix_in_hex[sizeof("0000 0000 0000 0000")] = "";
1019 u_int rtc_prefix_in_hex_len = 0;
1020 static char output[61]; /* max response string */
1021 /* allocate space for the largest possible string */
1022 char astostr[AS_STR_SIZE];
1023 uint16_t ec_type = 0;
1024 u_int octet_count;
1025 u_int i;
1026
1027 if (plen == 0) {
1028 snprintf(output, sizeof(output), "route-target: 0:0/0");
1029 return (output);
1030 }
1031
1032 /* hex representation of the prefix */
1033 octet_count = (plen+7)/8;
1034 for (i=0; i<octet_count; i++) {
1035 rtc_prefix_in_hex_len += snprintf(rtc_prefix_in_hex+rtc_prefix_in_hex_len,
1036 sizeof(rtc_prefix_in_hex)-rtc_prefix_in_hex_len,
1037 "%02x%s", *(pptr+i),
1038 ((i%2 == 1) && (i<octet_count-1)) ? " " : "");
1039 }
1040
1041 if (plen < 16) {
1042 /*
1043 * The prefix is too short to include the full ext-comm type,
1044 * so we have no way to parse it further.
1045 */
1046 snprintf(output, sizeof(output), "route-target: partial-type: (%s/%d)",
1047 rtc_prefix_in_hex, plen);
1048 return (output);
1049 }
1050
1051 /*
1052 * get the ext-comm type
1053 * Note: pptr references a static 8 octet buffer with unused bits set to 0,
1054 * hence EXTRACT_*() macros are safe.
1055 */
1056 ec_type = EXTRACT_BE_U_2(pptr);
1057 switch (ec_type) {
1058 case BGP_EXT_COM_RT_0:
1059 /* 2-byte-AS:number fmt */
1060 snprintf(output, sizeof(output), "route-target: %u:%u/%d (%s)",
1061 EXTRACT_BE_U_2(pptr+2),
1062 EXTRACT_BE_U_4(pptr+4),
1063 plen, rtc_prefix_in_hex);
1064 break;
1065
1066 case BGP_EXT_COM_RT_1:
1067 /* IP-address:AS fmt */
1068 snprintf(output, sizeof(output), "route-target: %u.%u.%u.%u:%u/%d (%s)",
1069 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5),
1070 EXTRACT_BE_U_2(pptr+6), plen, rtc_prefix_in_hex);
1071 break;
1072
1073 case BGP_EXT_COM_RT_2:
1074 /* 4-byte-AS:number fmt */
1075 snprintf(output, sizeof(output), "route-target: %s:%u/%d (%s)",
1076 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(pptr+2)),
1077 EXTRACT_BE_U_2(pptr+6), plen, rtc_prefix_in_hex);
1078 break;
1079
1080 default:
1081 snprintf(output, sizeof(output), "route target: unknown-type(%04x) (%s/%d)",
1082 ec_type,
1083 rtc_prefix_in_hex, plen);
1084 break;
1085 }
1086 return (output);
1087 }
1088
1089 /* RFC 4684 */
1090 static int
1091 print_rt_routing_info(netdissect_options *ndo, const u_char *pptr)
1092 {
1093 uint8_t route_target[8];
1094 u_int plen;
1095 /* allocate space for the largest possible string */
1096 char astostr[AS_STR_SIZE];
1097 u_int num_octets;
1098
1099 /* NLRI "prefix length" from RFC 2858 Section 4. */
1100 plen = GET_U_1(pptr); /* get prefix length */
1101
1102 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
1103 * RFC 4684 Section 4 defines the layout of "origin AS" and "route
1104 * target" fields inside the "prefix" depending on its length.
1105 */
1106 if (0 == plen) {
1107 /* Without "origin AS", without "route target". */
1108 ND_PRINT("\n\t default route target");
1109 return 1;
1110 }
1111
1112 if (32 > plen) {
1113 ND_PRINT("\n\t (illegal prefix length)");
1114 return -1;
1115 }
1116
1117 /* With at least "origin AS", possibly with "route target". */
1118 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 1));
1119
1120 plen -= 32; /* adjust prefix length */
1121
1122 if (64 < plen) {
1123 ND_PRINT("\n\t (illegal prefix length)");
1124 return -1;
1125 }
1126
1127 /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 }
1128 * and gives the number of octets in the variable-length "route
1129 * target" field inside this NLRI "prefix". Look for it.
1130 */
1131 memset(&route_target, 0, sizeof(route_target));
1132 num_octets = (plen + 7) / 8;
1133 GET_CPY_BYTES(&route_target, pptr + 5, num_octets);
1134 /* If mask-len is not on octet boundary, ensure all extra bits are 0 */
1135 if (plen % 8) {
1136 ((u_char *)&route_target)[num_octets - 1] &=
1137 ((0xff00 >> (plen % 8)) & 0xff);
1138 }
1139 ND_PRINT("\n\t origin AS: %s, %s",
1140 astostr,
1141 bgp_rt_prefix_print(ndo, (u_char *)&route_target, plen));
1142
1143 return 5 + num_octets;
1144 }
1145
1146 static int
1147 print_labeled_vpn_prefix4(netdissect_options *ndo, const u_char *pptr)
1148 {
1149 nd_ipv4 addr;
1150 u_int plen;
1151
1152 plen = GET_U_1(pptr); /* get prefix length */
1153
1154 if ((24+64) > plen)
1155 goto badplen;
1156
1157 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1158
1159 if (32 < plen)
1160 goto badplen;
1161
1162 memset(&addr, 0, sizeof(addr));
1163 GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
1164 if (plen % 8) {
1165 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
1166 ((0xff00 >> (plen % 8)) & 0xff);
1167 }
1168 /* the label may get offsetted by 4 bits so lets shift it right */
1169 ND_PRINT("\n\t RD: %s, %s/%u, label:%u %s",
1170 bgp_vpn_rd_print(ndo, pptr+4),
1171 ipaddr_string(ndo, (const u_char *)&addr),
1172 plen,
1173 GET_BE_U_3(pptr + 1)>>4,
1174 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1175
1176 return 12 + (plen + 7) / 8;
1177
1178 badplen:
1179 ND_PRINT("\n\t (illegal prefix length)");
1180 return -1;
1181 }
1182
1183 /*
1184 * +-------------------------------+
1185 * | |
1186 * | RD:IPv4-address (12 octets) |
1187 * | |
1188 * +-------------------------------+
1189 * | MDT Group-address (4 octets) |
1190 * +-------------------------------+
1191 */
1192
1193 #define MDT_VPN_NLRI_LEN 16
1194
1195 static int
1196 print_mdt_vpn_nlri(netdissect_options *ndo, const u_char *pptr)
1197 {
1198 const u_char *rd;
1199 const u_char *vpn_ip;
1200
1201 /* if the NLRI is not predefined length, quit.*/
1202 if (GET_U_1(pptr) != MDT_VPN_NLRI_LEN * 8) {
1203 ND_PRINT("\n\t (illegal prefix length)");
1204 return -1;
1205 }
1206 pptr++;
1207
1208 /* RD */
1209 ND_TCHECK_8(pptr);
1210 rd = pptr;
1211 pptr += 8;
1212
1213 /* IPv4 address */
1214 vpn_ip = pptr;
1215 pptr += sizeof(nd_ipv4);
1216
1217 /* MDT Group Address */
1218 ND_PRINT("\n\t RD: %s, VPN IP Address: %s, MC Group Address: %s",
1219 bgp_vpn_rd_print(ndo, rd),
1220 GET_IPADDR_STRING(vpn_ip),
1221 GET_IPADDR_STRING(pptr));
1222
1223 return MDT_VPN_NLRI_LEN + 1;
1224
1225 trunc:
1226 return -2;
1227 }
1228
1229 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
1230 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
1231 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
1232 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
1233 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
1234 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
1235 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
1236
1237 static const struct tok bgp_multicast_vpn_route_type_values[] = {
1238 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
1239 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
1240 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
1241 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
1242 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
1243 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
1244 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
1245 { 0, NULL}
1246 };
1247
1248 static int
1249 print_multicast_vpn(netdissect_options *ndo, const u_char *pptr)
1250 {
1251 /* allocate space for the largest possible string */
1252 char astostr[AS_STR_SIZE];
1253 uint8_t route_type, route_length;
1254 u_int addr_length, sg_length;
1255
1256 route_type = GET_U_1(pptr);
1257 pptr++;
1258 route_length = GET_U_1(pptr);
1259 pptr++;
1260
1261 ND_PRINT("\n\t Route-Type: %s (%u), length: %u",
1262 tok2str(bgp_multicast_vpn_route_type_values,
1263 "Unknown", route_type),
1264 route_type, route_length);
1265
1266 switch(route_type) {
1267 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
1268 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1269 if (route_length < BGP_VPN_RD_LEN)
1270 goto trunc;
1271 ND_PRINT(", RD: %s, Originator %s",
1272 bgp_vpn_rd_print(ndo, pptr),
1273 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
1274 (route_length - BGP_VPN_RD_LEN) << 3));
1275 break;
1276 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
1277 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1278 ND_PRINT(", RD: %s, Source-AS %s",
1279 bgp_vpn_rd_print(ndo, pptr),
1280 as_printf(ndo, astostr, sizeof(astostr),
1281 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1282 break;
1283
1284 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
1285 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1286 ND_PRINT(", RD: %s", bgp_vpn_rd_print(ndo, pptr));
1287 pptr += BGP_VPN_RD_LEN;
1288
1289 sg_length = bgp_vpn_sg_print(ndo, pptr);
1290 addr_length = route_length - sg_length;
1291
1292 ND_TCHECK_LEN(pptr, addr_length);
1293 ND_PRINT(", Originator %s",
1294 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
1295 break;
1296
1297 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
1298 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1299 ND_PRINT(", RD: %s", bgp_vpn_rd_print(ndo, pptr));
1300 pptr += BGP_VPN_RD_LEN;
1301
1302 bgp_vpn_sg_print(ndo, pptr);
1303 break;
1304
1305 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
1306 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
1307 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1308 ND_PRINT(", RD: %s, Source-AS %s",
1309 bgp_vpn_rd_print(ndo, pptr),
1310 as_printf(ndo, astostr, sizeof(astostr),
1311 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1312 pptr += BGP_VPN_RD_LEN + 4;
1313
1314 bgp_vpn_sg_print(ndo, pptr);
1315 break;
1316
1317 /*
1318 * no per route-type printing yet.
1319 */
1320 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
1321 default:
1322 break;
1323 }
1324
1325 return route_length + 2;
1326
1327 trunc:
1328 return -2;
1329 }
1330
1331 /*
1332 * As I remember, some versions of systems have an snprintf() that
1333 * returns -1 if the buffer would have overflowed. If the return
1334 * value is negative, set buflen to 0, to indicate that we've filled
1335 * the buffer up.
1336 *
1337 * If the return value is greater than buflen, that means that
1338 * the buffer would have overflowed; again, set buflen to 0 in
1339 * that case.
1340 */
1341 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1342 if (stringlen<0) \
1343 buflen=0; \
1344 else if ((u_int)stringlen>buflen) \
1345 buflen=0; \
1346 else { \
1347 buflen-=stringlen; \
1348 buf+=stringlen; \
1349 }
1350
1351 static int
1352 print_labeled_vpn_l2(netdissect_options *ndo, const u_char *pptr)
1353 {
1354 u_int plen, tlen, tlv_type, tlv_len, ttlv_len;
1355
1356 plen = GET_BE_U_2(pptr);
1357 tlen = plen;
1358 pptr += 2;
1359 /* Old and new L2VPN NLRI share AFI/SAFI
1360 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1361 * and > 17 as old format. Complain for the middle case
1362 */
1363 if (plen == 12) {
1364 /* assume AD-only with RD, BGPNH */
1365 ND_TCHECK_LEN(pptr, 12);
1366 ND_PRINT("\n\t RD: %s, BGPNH: %s",
1367 bgp_vpn_rd_print(ndo, pptr),
1368 GET_IPADDR_STRING(pptr+8));
1369 return plen + 2;
1370 } else if (plen > 17) {
1371 /* assume old format */
1372 /* RD, ID, LBLKOFF, LBLBASE */
1373
1374 ND_TCHECK_LEN(pptr, 15);
1375 ND_PRINT("\n\t RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1376 bgp_vpn_rd_print(ndo, pptr),
1377 GET_BE_U_2(pptr + 8),
1378 GET_BE_U_2(pptr + 10),
1379 GET_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1380 pptr += 15;
1381 tlen -= 15;
1382
1383 /* ok now the variable part - lets read out TLVs*/
1384 while (tlen != 0) {
1385 if (tlen < 3) {
1386 ND_PRINT("\n\t\tran past the end");
1387 return plen + 2;
1388 }
1389 tlv_type = GET_U_1(pptr);
1390 pptr++;
1391 tlv_len = GET_BE_U_2(pptr); /* length, in *bits* */
1392 ttlv_len = (tlv_len + 7)/8; /* length, in *bytes* */
1393 pptr += 2;
1394
1395 switch(tlv_type) {
1396 case 1:
1397 ND_PRINT("\n\t\tcircuit status vector (%u) length: %u: 0x",
1398 tlv_type,
1399 tlv_len);
1400 while (ttlv_len != 0) {
1401 if (tlen < 1) {
1402 ND_PRINT(" (ran past the end)");
1403 return plen + 2;
1404 }
1405 ND_TCHECK_1(pptr);
1406 ND_PRINT("%02x", GET_U_1(pptr));
1407 pptr++;
1408 ttlv_len--;
1409 tlen--;
1410 }
1411 break;
1412 default:
1413 ND_PRINT("\n\t\tunknown TLV #%u, length: %u",
1414 tlv_type,
1415 tlv_len);
1416 if (tlen < ttlv_len) {
1417 ND_PRINT(" (ran past the end)");
1418 return plen + 2;
1419 }
1420 tlen -= ttlv_len;
1421 break;
1422 }
1423 }
1424 return plen + 2;
1425 } else {
1426 /* complain bitterly ? */
1427 /* fall through */
1428 goto trunc;
1429 }
1430
1431 trunc:
1432 return -2;
1433 }
1434
1435 int
1436 decode_prefix6(netdissect_options *ndo,
1437 const u_char *pd, u_int itemlen, char *buf, size_t buflen)
1438 {
1439 nd_ipv6 addr;
1440 u_int plen, plenbytes;
1441
1442 ITEMCHECK(1);
1443 plen = GET_U_1(pd);
1444 if (128 < plen)
1445 return -1;
1446 itemlen -= 1;
1447
1448 memset(&addr, 0, sizeof(addr));
1449 plenbytes = (plen + 7) / 8;
1450 ITEMCHECK(plenbytes);
1451 GET_CPY_BYTES(&addr, pd + 1, plenbytes);
1452 if (plen % 8) {
1453 addr[plenbytes - 1] &=
1454 ((0xff00 >> (plen % 8)) & 0xff);
1455 }
1456 snprintf(buf, buflen, "%s/%u", ip6addr_string(ndo, (const u_char *)&addr), plen);
1457 return 1 + plenbytes;
1458
1459 badtlv:
1460 return -2;
1461 }
1462
1463 static int
1464 print_labeled_prefix6(netdissect_options *ndo,
1465 const u_char *pptr, u_int itemlen)
1466 {
1467 nd_ipv6 addr;
1468 u_int plen, plenbytes;
1469
1470 /* prefix length and label = 4 bytes */
1471 ND_TCHECK_4(pptr);
1472 ITEMCHECK(4);
1473 plen = GET_U_1(pptr); /* get prefix length */
1474
1475 if (24 > plen)
1476 goto badplen;
1477
1478 plen -= 24; /* adjust prefixlen - labellength */
1479
1480 if (128 < plen)
1481 goto badplen;
1482 itemlen -= 4;
1483
1484 memset(&addr, 0, sizeof(addr));
1485 plenbytes = (plen + 7) / 8;
1486 GET_CPY_BYTES(&addr, pptr + 4, plenbytes);
1487 if (plen % 8) {
1488 addr[plenbytes - 1] &=
1489 ((0xff00 >> (plen % 8)) & 0xff);
1490 }
1491 /* the label may get offsetted by 4 bits so lets shift it right */
1492 ND_PRINT("\n\t %s/%u, label:%u %s",
1493 ip6addr_string(ndo, (const u_char *)&addr),
1494 plen,
1495 GET_BE_U_3(pptr + 1)>>4,
1496 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1497
1498 return 4 + plenbytes;
1499
1500 badplen:
1501 ND_PRINT("\n\t (illegal prefix length)");
1502 return -1;
1503
1504 trunc:
1505 return -2;
1506
1507 badtlv:
1508 return -3;
1509 }
1510
1511 static int
1512 print_labeled_vpn_prefix6(netdissect_options *ndo, const u_char *pptr)
1513 {
1514 nd_ipv6 addr;
1515 u_int plen;
1516
1517 plen = GET_U_1(pptr); /* get prefix length */
1518
1519 if ((24+64) > plen)
1520 goto badplen;
1521
1522 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1523
1524 if (128 < plen)
1525 goto badplen;
1526
1527 memset(&addr, 0, sizeof(addr));
1528 GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
1529 if (plen % 8) {
1530 addr[(plen + 7) / 8 - 1] &=
1531 ((0xff00 >> (plen % 8)) & 0xff);
1532 }
1533 /* the label may get offsetted by 4 bits so lets shift it right */
1534 ND_PRINT("\n\t RD: %s, %s/%u, label:%u %s",
1535 bgp_vpn_rd_print(ndo, pptr+4),
1536 ip6addr_string(ndo, (const u_char *)&addr),
1537 plen,
1538 GET_BE_U_3(pptr + 1)>>4,
1539 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1540
1541 return 12 + (plen + 7) / 8;
1542
1543 badplen:
1544 ND_PRINT("\n\t (illegal prefix length)");
1545 return -1;
1546 }
1547
1548 static int
1549 print_clnp_prefix(netdissect_options *ndo, const u_char *pptr)
1550 {
1551 uint8_t addr[19];
1552 u_int plen;
1553
1554 plen = GET_U_1(pptr); /* get prefix length */
1555
1556 if (152 < plen)
1557 goto badplen;
1558
1559 memset(&addr, 0, sizeof(addr));
1560 GET_CPY_BYTES(&addr, pptr + 4, (plen + 7) / 8);
1561 if (plen % 8) {
1562 addr[(plen + 7) / 8 - 1] &=
1563 ((0xff00 >> (plen % 8)) & 0xff);
1564 }
1565 /* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */
1566 ND_PRINT("\n\t %s/%u",
1567 isonsap_string(ndo, addr,(plen + 7) / 8),
1568 plen);
1569
1570 return 1 + (plen + 7) / 8;
1571
1572 badplen:
1573 ND_PRINT("\n\t (illegal prefix length)");
1574 return -1;
1575 }
1576
1577 static int
1578 print_labeled_vpn_clnp_prefix(netdissect_options *ndo, const u_char *pptr)
1579 {
1580 uint8_t addr[19];
1581 u_int plen;
1582
1583 plen = GET_U_1(pptr); /* get prefix length */
1584
1585 if ((24+64) > plen)
1586 goto badplen;
1587
1588 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1589
1590 if (152 < plen)
1591 goto badplen;
1592
1593 memset(&addr, 0, sizeof(addr));
1594 GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
1595 if (plen % 8) {
1596 addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
1597 }
1598 /* the label may get offsetted by 4 bits so lets shift it right */
1599 /* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */
1600 ND_PRINT("\n\t RD: %s, %s/%u, label:%u %s",
1601 bgp_vpn_rd_print(ndo, pptr+4),
1602 isonsap_string(ndo, addr,(plen + 7) / 8),
1603 plen,
1604 GET_BE_U_3(pptr + 1)>>4,
1605 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1606
1607 return 12 + (plen + 7) / 8;
1608
1609 badplen:
1610 ND_PRINT("\n\t (illegal prefix length)");
1611 return -1;
1612 }
1613
1614 /*
1615 * bgp_attr_get_as_size
1616 *
1617 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1618 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1619 * support, exchange AS-Path with the same path-attribute type value 0x02.
1620 */
1621 static u_int
1622 bgp_attr_get_as_size(netdissect_options *ndo,
1623 uint8_t bgpa_type, const u_char *pptr, u_int len)
1624 {
1625 const u_char *tptr = pptr;
1626
1627 /*
1628 * If the path attribute is the optional AS4 path type, then we already
1629 * know, that ASs must be encoded in 4 byte format.
1630 */
1631 if (bgpa_type == BGPTYPE_AS4_PATH) {
1632 return 4;
1633 }
1634
1635 /*
1636 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1637 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1638 * each.
1639 */
1640 while (tptr < pptr + len) {
1641 /*
1642 * If we do not find a valid segment type, our guess might be wrong.
1643 */
1644 if (GET_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || GET_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
1645 goto trunc;
1646 }
1647 tptr += 2 + GET_U_1(tptr + 1) * 2;
1648 }
1649
1650 /*
1651 * If we correctly reached end of the AS path attribute data content,
1652 * then most likely ASs were indeed encoded as 2 bytes.
1653 */
1654 if (tptr == pptr + len) {
1655 return 2;
1656 }
1657
1658 trunc:
1659
1660 /*
1661 * We can come here, either we did not have enough data, or if we
1662 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1663 * so that caller can try to decode each AS as of 4 bytes. If indeed
1664 * there was not enough data, it will crib and end the parse anyways.
1665 */
1666 return 4;
1667 }
1668
1669 /*
1670 * The only way to know that a BGP UPDATE message is using add path is
1671 * by checking if the capability is in the OPEN message which we may have missed.
1672 * So this function checks if it is possible that the update could contain add path
1673 * and if so it checks that standard BGP doesn't make sense.
1674 */
1675 static int
1676 check_add_path(netdissect_options *ndo, const u_char *pptr, u_int length,
1677 u_int max_prefix_length)
1678 {
1679 u_int offset, prefix_length;
1680
1681 if (length < 5) {
1682 return 0;
1683 }
1684
1685 /*
1686 * Scan through the NLRI information under the assumption that
1687 * it doesn't have path IDs.
1688 */
1689 for (offset = 0; offset < length;) {
1690 offset += 4;
1691 if (!ND_TTEST_1(pptr + offset)) {
1692 /* We ran out of captured data; quit scanning. */
1693 break;
1694 }
1695 prefix_length = GET_U_1(pptr + offset);
1696 /*
1697 * Add 4 to cover the path id
1698 * and check the prefix length isn't greater than 32/128.
1699 */
1700 if (prefix_length > max_prefix_length) {
1701 return 0;
1702 }
1703 /* Add 1 for the prefix_length byte and prefix_length to cover the address */
1704 offset += 1 + ((prefix_length + 7) / 8);
1705 }
1706 /* check we haven't gone past the end of the section */
1707 if (offset > length) {
1708 return 0;
1709 }
1710
1711 /* check it's not standard BGP */
1712 for (offset = 0; offset < length; ) {
1713 if (!ND_TTEST_1(pptr + offset)) {
1714 /* We ran out of captured data; quit scanning. */
1715 break;
1716 }
1717 prefix_length = GET_U_1(pptr + offset);
1718 /*
1719 * If the prefix_length is zero (0.0.0.0/0)
1720 * and since it's not the only address (length >= 5)
1721 * then it is add-path
1722 */
1723 if (prefix_length < 1 || prefix_length > max_prefix_length) {
1724 return 1;
1725 }
1726 offset += 1 + ((prefix_length + 7) / 8);
1727 }
1728 if (offset > length) {
1729 return 1;
1730 }
1731
1732 /* assume not add-path by default */
1733 return 0;
1734 }
1735
1736 static int
1737 bgp_mp_af_print(netdissect_options *ndo,
1738 const u_char *tptr, u_int tlen,
1739 uint16_t *afp, uint8_t *safip)
1740 {
1741 uint16_t af;
1742 uint8_t safi;
1743
1744 af = GET_BE_U_2(tptr);
1745 *afp = af;
1746 safi = GET_U_1(tptr + 2);
1747 *safip = safi;
1748
1749 ND_PRINT("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1750 tok2str(af_values, "Unknown AFI", af),
1751 af,
1752 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1753 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1754 safi);
1755
1756 switch(af<<8 | safi) {
1757 case (AFNUM_IP<<8 | SAFNUM_UNICAST):
1758 case (AFNUM_IP<<8 | SAFNUM_MULTICAST):
1759 case (AFNUM_IP<<8 | SAFNUM_UNIMULTICAST):
1760 case (AFNUM_IP<<8 | SAFNUM_LABUNICAST):
1761 case (AFNUM_IP<<8 | SAFNUM_RT_ROUTING_INFO):
1762 case (AFNUM_IP<<8 | SAFNUM_VPNUNICAST):
1763 case (AFNUM_IP<<8 | SAFNUM_VPNMULTICAST):
1764 case (AFNUM_IP<<8 | SAFNUM_VPNUNIMULTICAST):
1765 case (AFNUM_IP<<8 | SAFNUM_MULTICAST_VPN):
1766 case (AFNUM_IP<<8 | SAFNUM_MDT):
1767 case (AFNUM_IP6<<8 | SAFNUM_UNICAST):
1768 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST):
1769 case (AFNUM_IP6<<8 | SAFNUM_UNIMULTICAST):
1770 case (AFNUM_IP6<<8 | SAFNUM_LABUNICAST):
1771 case (AFNUM_IP6<<8 | SAFNUM_VPNUNICAST):
1772 case (AFNUM_IP6<<8 | SAFNUM_VPNMULTICAST):
1773 case (AFNUM_IP6<<8 | SAFNUM_VPNUNIMULTICAST):
1774 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1775 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1776 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1777 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1778 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1779 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1780 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1781 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1782 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1783 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1784 break;
1785 default:
1786 ND_TCHECK_LEN(tptr, tlen);
1787 ND_PRINT("\n\t no AFI %u / SAFI %u decoder", af, safi);
1788 if (ndo->ndo_vflag <= 1)
1789 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1790 return -1;
1791 }
1792 return 0;
1793 trunc:
1794 return -2;
1795 }
1796
1797 static int
1798 bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi,
1799 const u_char *tptr, u_int len,
1800 int add_path4, int add_path6)
1801 {
1802 int advance;
1803 u_int path_id = 0;
1804 char buf[512];
1805
1806 switch (af<<8 | safi) {
1807 case (AFNUM_IP<<8 | SAFNUM_UNICAST):
1808 case (AFNUM_IP<<8 | SAFNUM_MULTICAST):
1809 case (AFNUM_IP<<8 | SAFNUM_UNIMULTICAST):
1810 if (add_path4) {
1811 path_id = GET_BE_U_4(tptr);
1812 tptr += 4;
1813 }
1814 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1815 if (advance == -1)
1816 ND_PRINT("\n\t (illegal prefix length)");
1817 else if (advance == -2)
1818 break; /* bytes left, but not enough */
1819 else
1820 ND_PRINT("\n\t %s", buf);
1821 if (add_path4) {
1822 ND_PRINT(" Path Id: %u", path_id);
1823 advance += 4;
1824 }
1825 break;
1826 case (AFNUM_IP<<8 | SAFNUM_LABUNICAST):
1827 advance = print_labeled_prefix4(ndo, tptr, len);
1828 if (advance == -2)
1829 goto trunc;
1830 break;
1831 case (AFNUM_IP<<8 | SAFNUM_VPNUNICAST):
1832 case (AFNUM_IP<<8 | SAFNUM_VPNMULTICAST):
1833 case (AFNUM_IP<<8 | SAFNUM_VPNUNIMULTICAST):
1834 advance = print_labeled_vpn_prefix4(ndo, tptr);
1835 break;
1836 case (AFNUM_IP<<8 | SAFNUM_RT_ROUTING_INFO):
1837 advance = print_rt_routing_info(ndo, tptr);
1838 break;
1839 case (AFNUM_IP<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1840 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST_VPN):
1841 advance = print_multicast_vpn(ndo, tptr);
1842 if (advance == -2)
1843 goto trunc;
1844 break;
1845
1846 case (AFNUM_IP<<8 | SAFNUM_MDT):
1847 advance = print_mdt_vpn_nlri(ndo, tptr);
1848 if (advance == -2)
1849 goto trunc;
1850 break;
1851 case (AFNUM_IP6<<8 | SAFNUM_UNICAST):
1852 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST):
1853 case (AFNUM_IP6<<8 | SAFNUM_UNIMULTICAST):
1854 if (add_path6) {
1855 path_id = GET_BE_U_4(tptr);
1856 tptr += 4;
1857 }
1858 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1859 if (advance == -1)
1860 ND_PRINT("\n\t (illegal prefix length)");
1861 else if (advance == -2)
1862 break; /* bytes left, but not enough */
1863 else
1864 ND_PRINT("\n\t %s", buf);
1865 if (add_path6) {
1866 ND_PRINT(" Path Id: %u", path_id);
1867 advance += 4;
1868 }
1869 break;
1870 case (AFNUM_IP6<<8 | SAFNUM_LABUNICAST):
1871 advance = print_labeled_prefix6(ndo, tptr, len);
1872 if (advance == -2)
1873 goto trunc;
1874 break;
1875 case (AFNUM_IP6<<8 | SAFNUM_VPNUNICAST):
1876 case (AFNUM_IP6<<8 | SAFNUM_VPNMULTICAST):
1877 case (AFNUM_IP6<<8 | SAFNUM_VPNUNIMULTICAST):
1878 advance = print_labeled_vpn_prefix6(ndo, tptr);
1879 break;
1880 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1881 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1882 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1883 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1884 advance = print_labeled_vpn_l2(ndo, tptr);
1885 if (advance == -2)
1886 goto trunc;
1887 break;
1888 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1889 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1890 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1891 advance = print_clnp_prefix(ndo, tptr);
1892 break;
1893 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1894 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1895 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1896 advance = print_labeled_vpn_clnp_prefix(ndo, tptr);
1897 break;
1898 default:
1899 /*
1900 * This should not happen, we should have been protected
1901 * by bgp_mp_af_print()'s return value.
1902 */
1903 ND_PRINT("\n\t ERROR: no AFI %u / SAFI %u decoder", af, safi);
1904 advance = -4;
1905 break;
1906 }
1907 return advance;
1908 trunc: /* we rely on the caller to recognize -2 return value */
1909 return -2;
1910 }
1911
1912 static const struct tok bgp_flags[] = {
1913 { 0x80, "O"},
1914 { 0x40, "T"},
1915 { 0x20, "P"},
1916 { 0x10, "E"},
1917 { 0, NULL }
1918 };
1919
1920 static int
1921 bgp_attr_print(netdissect_options *ndo,
1922 uint8_t atype, const u_char *pptr, u_int len,
1923 const unsigned attr_set_level)
1924 {
1925 /* allocate space for the largest possible string */
1926 char astostr[AS_STR_SIZE];
1927 u_int i;
1928 uint16_t af;
1929 uint8_t safi, snpa, nhlen;
1930 int advance;
1931 u_int tlen;
1932 const u_char *tptr;
1933 u_int as_size;
1934 int add_path4, add_path6;
1935 int ret;
1936
1937 tptr = pptr;
1938 tlen = len;
1939
1940 switch (atype) {
1941 case BGPTYPE_ORIGIN:
1942 if (len != 1)
1943 ND_PRINT("invalid len");
1944 else {
1945 ND_PRINT("%s", tok2str(bgp_origin_values,
1946 "Unknown Origin Typecode",
1947 GET_U_1(tptr)));
1948 }
1949 break;
1950
1951 /*
1952 * Process AS4 byte path and AS2 byte path attributes here.
1953 */
1954 case BGPTYPE_AS4_PATH:
1955 case BGPTYPE_AS_PATH:
1956 if (len % 2) {
1957 ND_PRINT("invalid len");
1958 break;
1959 }
1960 if (!len) {
1961 ND_PRINT("empty");
1962 break;
1963 }
1964
1965 /*
1966 * BGP updates exchanged between New speakers that support 4
1967 * byte AS, ASs are always encoded in 4 bytes. There is no
1968 * definitive way to find this, just by the packet's
1969 * contents. So, check for packet's TLV's sanity assuming
1970 * 2 bytes first, and it does not pass, assume that ASs are
1971 * encoded in 4 bytes format and move on.
1972 */
1973 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1974
1975 while (tptr < pptr + len) {
1976 ND_PRINT("%s", tok2str(bgp_as_path_segment_open_values,
1977 "?", GET_U_1(tptr)));
1978 for (i = 0; i < GET_U_1(tptr + 1) * as_size; i += as_size) {
1979 ND_TCHECK_LEN(tptr + 2 + i, as_size);
1980 ND_PRINT("%s ",
1981 as_printf(ndo, astostr, sizeof(astostr),
1982 as_size == 2 ?
1983 GET_BE_U_2(tptr + i + 2) :
1984 GET_BE_U_4(tptr + i + 2)));
1985 }
1986 ND_PRINT("%s", tok2str(bgp_as_path_segment_close_values,
1987 "?", GET_U_1(tptr)));
1988 tptr += 2 + GET_U_1(tptr + 1) * as_size;
1989 }
1990 break;
1991 case BGPTYPE_NEXT_HOP:
1992 if (len != 4)
1993 ND_PRINT("invalid len");
1994 else {
1995 ND_PRINT("%s", GET_IPADDR_STRING(tptr));
1996 }
1997 break;
1998 case BGPTYPE_MULTI_EXIT_DISC:
1999 case BGPTYPE_LOCAL_PREF:
2000 if (len != 4)
2001 ND_PRINT("invalid len");
2002 else {
2003 ND_PRINT("%u", GET_BE_U_4(tptr));
2004 }
2005 break;
2006 case BGPTYPE_ATOMIC_AGGREGATE:
2007 if (len != 0)
2008 ND_PRINT("invalid len");
2009 break;
2010 case BGPTYPE_AGGREGATOR:
2011
2012 /*
2013 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
2014 * the length of this PA can be either 6 bytes or 8 bytes.
2015 */
2016 if (len != 6 && len != 8) {
2017 ND_PRINT("invalid len");
2018 break;
2019 }
2020 ND_TCHECK_LEN(tptr, len);
2021 if (len == 6) {
2022 ND_PRINT(" AS #%s, origin %s",
2023 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(tptr)),
2024 GET_IPADDR_STRING(tptr + 2));
2025 } else {
2026 ND_PRINT(" AS #%s, origin %s",
2027 as_printf(ndo, astostr, sizeof(astostr),
2028 GET_BE_U_4(tptr)), GET_IPADDR_STRING(tptr + 4));
2029 }
2030 break;
2031 case BGPTYPE_AGGREGATOR4:
2032 if (len != 8) {
2033 ND_PRINT("invalid len");
2034 break;
2035 }
2036 ND_PRINT(" AS #%s, origin %s",
2037 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)),
2038 GET_IPADDR_STRING(tptr + 4));
2039 break;
2040 case BGPTYPE_COMMUNITIES:
2041 if (len % 4) {
2042 ND_PRINT("invalid len");
2043 break;
2044 }
2045 while (tlen != 0) {
2046 uint32_t comm;
2047 ND_TCHECK_4(tptr);
2048 if (tlen < 4)
2049 goto trunc;
2050 comm = GET_BE_U_4(tptr);
2051 switch (comm) {
2052 case BGP_COMMUNITY_NO_EXPORT:
2053 ND_PRINT(" NO_EXPORT");
2054 break;
2055 case BGP_COMMUNITY_NO_ADVERT:
2056 ND_PRINT(" NO_ADVERTISE");
2057 break;
2058 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
2059 ND_PRINT(" NO_EXPORT_SUBCONFED");
2060 break;
2061 default:
2062 ND_PRINT("%u:%u%s",
2063 (comm >> 16) & 0xffff,
2064 comm & 0xffff,
2065 (tlen>4) ? ", " : "");
2066 break;
2067 }
2068 tlen -=4;
2069 tptr +=4;
2070 }
2071 break;
2072 case BGPTYPE_ORIGINATOR_ID:
2073 if (len != 4) {
2074 ND_PRINT("invalid len");
2075 break;
2076 }
2077 ND_PRINT("%s",GET_IPADDR_STRING(tptr));
2078 break;
2079 case BGPTYPE_CLUSTER_LIST:
2080 if (len % 4) {
2081 ND_PRINT("invalid len");
2082 break;
2083 }
2084 while (tlen != 0) {
2085 if (tlen < 4)
2086 goto trunc;
2087 ND_PRINT("%s%s",
2088 GET_IPADDR_STRING(tptr),
2089 (tlen>4) ? ", " : "");
2090 tlen -=4;
2091 tptr +=4;
2092 }
2093 break;
2094 case BGPTYPE_MP_REACH_NLRI:
2095 ND_TCHECK_3(tptr);
2096 if (tlen < 3)
2097 goto trunc;
2098 ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
2099 if (ret == -2)
2100 goto trunc;
2101 if (ret < 0)
2102 break;
2103
2104 tptr += 3;
2105 tlen -= 3;
2106
2107 ND_TCHECK_1(tptr);
2108 if (tlen < 1)
2109 goto trunc;
2110 nhlen = GET_U_1(tptr);
2111 tptr++;
2112 tlen--;
2113
2114 if (nhlen) {
2115 u_int nnh = 0;
2116 uint8_t tnhlen = nhlen;
2117 if (tlen < tnhlen)
2118 goto trunc;
2119 ND_PRINT("\n\t nexthop: ");
2120 while (tnhlen != 0) {
2121 if (nnh++ > 0) {
2122 ND_PRINT(", " );
2123 }
2124 switch(af<<8 | safi) {
2125 case (AFNUM_IP<<8 | SAFNUM_UNICAST):
2126 case (AFNUM_IP<<8 | SAFNUM_MULTICAST):
2127 case (AFNUM_IP<<8 | SAFNUM_UNIMULTICAST):
2128 case (AFNUM_IP<<8 | SAFNUM_LABUNICAST):
2129 case (AFNUM_IP<<8 | SAFNUM_RT_ROUTING_INFO):
2130 case (AFNUM_IP<<8 | SAFNUM_MULTICAST_VPN):
2131 case (AFNUM_IP<<8 | SAFNUM_MDT):
2132 if (tnhlen < sizeof(nd_ipv4)) {
2133 ND_PRINT("invalid len");
2134 tptr += tnhlen;
2135 tlen -= tnhlen;
2136 tnhlen = 0;
2137 } else {
2138 ND_PRINT("%s",GET_IPADDR_STRING(tptr));
2139 tptr += sizeof(nd_ipv4);
2140 tnhlen -= sizeof(nd_ipv4);
2141 tlen -= sizeof(nd_ipv4);
2142 }
2143 break;
2144 case (AFNUM_IP<<8 | SAFNUM_VPNUNICAST):
2145 case (AFNUM_IP<<8 | SAFNUM_VPNMULTICAST):
2146 case (AFNUM_IP<<8 | SAFNUM_VPNUNIMULTICAST):
2147 if (tnhlen < sizeof(nd_ipv4)+BGP_VPN_RD_LEN) {
2148 ND_PRINT("invalid len");
2149 tptr += tnhlen;
2150 tlen -= tnhlen;
2151 tnhlen = 0;
2152 } else {
2153 ND_PRINT("RD: %s, %s",
2154 bgp_vpn_rd_print(ndo, tptr),
2155 GET_IPADDR_STRING(tptr+BGP_VPN_RD_LEN));
2156 tptr += (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2157 tlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2158 tnhlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2159 }
2160 break;
2161 case (AFNUM_IP6<<8 | SAFNUM_UNICAST):
2162 case (AFNUM_IP6<<8 | SAFNUM_MULTICAST):
2163 case (AFNUM_IP6<<8 | SAFNUM_UNIMULTICAST):
2164 case (AFNUM_IP6<<8 | SAFNUM_LABUNICAST):
2165 if (tnhlen < sizeof(nd_ipv6)) {
2166 ND_PRINT("invalid len");
2167 tptr += tnhlen;
2168 tlen -= tnhlen;
2169 tnhlen = 0;
2170 } else {
2171 ND_PRINT("%s", GET_IP6ADDR_STRING(tptr));
2172 tptr += sizeof(nd_ipv6);
2173 tlen -= sizeof(nd_ipv6);
2174 tnhlen -= sizeof(nd_ipv6);
2175 }
2176 break;
2177 case (AFNUM_IP6<<8 | SAFNUM_VPNUNICAST):
2178 case (AFNUM_IP6<<8 | SAFNUM_VPNMULTICAST):
2179 case (AFNUM_IP6<<8 | SAFNUM_VPNUNIMULTICAST):
2180 if (tnhlen < sizeof(nd_ipv6)+BGP_VPN_RD_LEN) {
2181 ND_PRINT("invalid len");
2182 tptr += tnhlen;
2183 tlen -= tnhlen;
2184 tnhlen = 0;
2185 } else {
2186 ND_PRINT("RD: %s, %s",
2187 bgp_vpn_rd_print(ndo, tptr),
2188 GET_IP6ADDR_STRING(tptr+BGP_VPN_RD_LEN));
2189 tptr += (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2190 tlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2191 tnhlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2192 }
2193 break;
2194 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
2195 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2196 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2197 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2198 if (tnhlen < sizeof(nd_ipv4)) {
2199 ND_PRINT("invalid len");
2200 tptr += tnhlen;
2201 tlen -= tnhlen;
2202 tnhlen = 0;
2203 } else {
2204 ND_PRINT("%s", GET_IPADDR_STRING(tptr));
2205 tptr += (sizeof(nd_ipv4));
2206 tlen -= (sizeof(nd_ipv4));
2207 tnhlen -= (sizeof(nd_ipv4));
2208 }
2209 break;
2210 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2211 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2212 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2213 ND_PRINT("%s", GET_ISONSAP_STRING(tptr, tnhlen));
2214 tptr += tnhlen;
2215 tlen -= tnhlen;
2216 tnhlen = 0;
2217 break;
2218
2219 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2220 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2221 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2222 if (tnhlen < BGP_VPN_RD_LEN+1) {
2223 ND_PRINT("invalid len");
2224 tptr += tnhlen;
2225 tlen -= tnhlen;
2226 tnhlen = 0;
2227 } else {
2228 ND_TCHECK_LEN(tptr, tnhlen);
2229 ND_PRINT("RD: %s, %s",
2230 bgp_vpn_rd_print(ndo, tptr),
2231 GET_ISONSAP_STRING(tptr+BGP_VPN_RD_LEN,tnhlen-BGP_VPN_RD_LEN));
2232 /* rfc986 mapped IPv4 address ? */
2233 if (GET_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
2234 ND_PRINT(" = %s", GET_IPADDR_STRING(tptr+BGP_VPN_RD_LEN+4));
2235 /* rfc1888 mapped IPv6 address ? */
2236 else if (GET_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
2237 ND_PRINT(" = %s", GET_IP6ADDR_STRING(tptr+BGP_VPN_RD_LEN+3));
2238 tptr += tnhlen;
2239 tlen -= tnhlen;
2240 tnhlen = 0;
2241 }
2242 break;
2243 default:
2244 /*
2245 * bgp_mp_af_print() should have saved us from
2246 * an unsupported AFI/SAFI.
2247 */
2248 ND_PRINT("ERROR: no AFI %u/SAFI %u nexthop decoder", af, safi);
2249 tptr += tnhlen;
2250 tlen -= tnhlen;
2251 tnhlen = 0;
2252 goto done;
2253 }
2254 }
2255 }
2256 ND_PRINT(", nh-length: %u", nhlen);
2257
2258 /* As per RFC 2858; this is reserved in RFC 4760 */
2259 if (tlen < 1)
2260 goto trunc;
2261 snpa = GET_U_1(tptr);
2262 tptr++;
2263 tlen--;
2264
2265 if (snpa) {
2266 ND_PRINT("\n\t %u SNPA", snpa);
2267 for (/*nothing*/; snpa != 0; snpa--) {
2268 uint8_t snpalen;
2269 if (tlen < 1)
2270 goto trunc;
2271 snpalen = GET_U_1(tptr);
2272 ND_PRINT("\n\t %u bytes", snpalen);
2273 tptr++;
2274 tlen--;
2275 if (tlen < snpalen)
2276 goto trunc;
2277 ND_TCHECK_LEN(tptr, snpalen);
2278 tptr += snpalen;
2279 tlen -= snpalen;
2280 }
2281 } else {
2282 ND_PRINT(", no SNPA");
2283 }
2284
2285 add_path4 = check_add_path(ndo, tptr,
2286 (len-ND_BYTES_BETWEEN(pptr, tptr)), 32);
2287 add_path6 = check_add_path(ndo, tptr,
2288 (len-ND_BYTES_BETWEEN(pptr, tptr)), 128);
2289
2290 while (tptr < pptr + len) {
2291 advance = bgp_nlri_print(ndo, af, safi, tptr, len,
2292 add_path4, add_path6);
2293 if (advance == -2)
2294 goto trunc;
2295 if (advance < 0)
2296 break;
2297 tptr += advance;
2298 }
2299 break;
2300
2301 case BGPTYPE_MP_UNREACH_NLRI:
2302 ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
2303 ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
2304 if (ret == -2)
2305 goto trunc;
2306 if (ret < 0)
2307 break;
2308
2309 if (len == BGP_MP_NLRI_MINSIZE)
2310 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2311
2312 tptr += 3;
2313
2314 add_path4 = check_add_path(ndo, tptr,
2315 (len-ND_BYTES_BETWEEN(pptr, tptr)), 32);
2316 add_path6 = check_add_path(ndo, tptr,
2317 (len-ND_BYTES_BETWEEN(pptr, tptr)), 128);
2318
2319 while (tptr < pptr + len) {
2320 advance = bgp_nlri_print(ndo, af, safi, tptr, len,
2321 add_path4, add_path6);
2322 if (advance == -2)
2323 goto trunc;
2324 if (advance < 0)
2325 break;
2326 tptr += advance;
2327 }
2328 break;
2329 case BGPTYPE_EXTD_COMMUNITIES:
2330 if (len % 8) {
2331 ND_PRINT("invalid len");
2332 break;
2333 }
2334 while (tlen != 0) {
2335 uint16_t extd_comm;
2336
2337 ND_TCHECK_2(tptr);
2338 if (tlen < 2)
2339 goto trunc;
2340 extd_comm=GET_BE_U_2(tptr);
2341
2342 ND_PRINT("\n\t %s (0x%04x), Flags [%s]",
2343 tok2str(bgp_extd_comm_subtype_values,
2344 "unknown extd community typecode",
2345 extd_comm),
2346 extd_comm,
2347 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm));
2348
2349 ND_TCHECK_8(tptr);
2350 if (tlen < 8)
2351 goto trunc;
2352 ND_PRINT(": ");
2353 bgp_extended_community_print(ndo, tptr);
2354 tlen -= 8;
2355 tptr += 8;
2356 }
2357 break;
2358
2359 case BGPTYPE_PMSI_TUNNEL:
2360 {
2361 uint8_t tunnel_type, flags;
2362
2363 ND_TCHECK_5(tptr);
2364 if (tlen < 5)
2365 goto trunc;
2366 flags = GET_U_1(tptr);
2367 tunnel_type = GET_U_1(tptr + 1);
2368
2369 ND_PRINT("\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2370 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2371 tunnel_type,
2372 bittok2str(bgp_pmsi_flag_values, "none", flags),
2373 GET_BE_U_3(tptr + 2)>>4);
2374
2375 tptr +=5;
2376 tlen -= 5;
2377
2378 switch (tunnel_type) {
2379 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2380 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2381 ND_PRINT("\n\t Sender %s, P-Group %s",
2382 GET_IPADDR_STRING(tptr),
2383 GET_IPADDR_STRING(tptr+4));
2384 break;
2385
2386 case BGP_PMSI_TUNNEL_PIM_SSM:
2387 ND_PRINT("\n\t Root-Node %s, P-Group %s",
2388 GET_IPADDR_STRING(tptr),
2389 GET_IPADDR_STRING(tptr+4));
2390 break;
2391 case BGP_PMSI_TUNNEL_INGRESS:
2392 ND_PRINT("\n\t Tunnel-Endpoint %s",
2393 GET_IPADDR_STRING(tptr));
2394 break;
2395 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2396 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2397 ND_PRINT("\n\t Root-Node %s, LSP-ID 0x%08x",
2398 GET_IPADDR_STRING(tptr),
2399 GET_BE_U_4(tptr + 4));
2400 break;
2401 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2402 ND_PRINT("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2403 GET_IPADDR_STRING(tptr),
2404 GET_BE_U_4(tptr + 4));
2405 break;
2406 default:
2407 if (ndo->ndo_vflag <= 1) {
2408 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2409 }
2410 }
2411 break;
2412 }
2413 case BGPTYPE_AIGP:
2414 {
2415 uint8_t type;
2416 uint16_t length;
2417
2418 while (tlen >= 3) {
2419 type = GET_U_1(tptr);
2420 length = GET_BE_U_2(tptr + 1);
2421 tptr += 3;
2422 tlen -= 3;
2423
2424 ND_PRINT("\n\t %s TLV (%u), length %u",
2425 tok2str(bgp_aigp_values, "Unknown", type),
2426 type, length);
2427
2428 if (length < 3)
2429 goto trunc;
2430 length -= 3;
2431
2432 /*
2433 * Check if we can read the TLV data.
2434 */
2435 if (tlen < length)
2436 goto trunc;
2437
2438 switch (type) {
2439
2440 case BGP_AIGP_TLV:
2441 if (length < 8)
2442 goto trunc;
2443 ND_PRINT(", metric %" PRIu64,
2444 GET_BE_U_8(tptr));
2445 break;
2446
2447 default:
2448 if (ndo->ndo_vflag <= 1) {
2449 print_unknown_data(ndo, tptr,"\n\t ", length);
2450 }
2451 }
2452
2453 tptr += length;
2454 tlen -= length;
2455 }
2456 break;
2457 }
2458 case BGPTYPE_ATTR_SET:
2459 ND_TCHECK_4(tptr);
2460 if (len < 4)
2461 goto trunc;
2462 ND_PRINT("\n\t Origin AS: %s",
2463 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)));
2464 tptr += 4;
2465 len -= 4;
2466
2467 while (len) {
2468 u_int aflags, alenlen, alen;
2469
2470 ND_TCHECK_2(tptr);
2471 if (len < 2) {
2472 ND_PRINT(" [path attr too short]");
2473 tptr += len;
2474 break;
2475 }
2476 aflags = GET_U_1(tptr);
2477 atype = GET_U_1(tptr + 1);
2478 tptr += 2;
2479 len -= 2;
2480 alenlen = bgp_attr_lenlen(aflags, tptr);
2481 ND_TCHECK_LEN(tptr, alenlen);
2482 if (len < alenlen) {
2483 ND_PRINT(" [path attr too short]");
2484 tptr += len;
2485 break;
2486 }
2487 alen = bgp_attr_len(aflags, tptr);
2488 tptr += alenlen;
2489 len -= alenlen;
2490
2491 ND_PRINT("\n\t %s (%u), length: %u",
2492 tok2str(bgp_attr_values,
2493 "Unknown Attribute", atype),
2494 atype,
2495 alen);
2496
2497 if (aflags) {
2498 ND_PRINT(", Flags [%s",
2499 bittok2str_nosep(bgp_flags, "", aflags));
2500 if (aflags & 0xf)
2501 ND_PRINT("+%x", aflags & 0xf);
2502 ND_PRINT("]");
2503 }
2504 ND_PRINT(": ");
2505 if (len < alen) {
2506 ND_PRINT(" [path attr too short]");
2507 tptr += len;
2508 break;
2509 }
2510 /*
2511 * The protocol encoding per se allows ATTR_SET to be nested
2512 * as many times as the message can accommodate. This printer
2513 * used to be able to recurse into ATTR_SET contents until the
2514 * stack exhaustion, but now there is a limit on that (if live
2515 * protocol exchange goes that many levels deep, something is
2516 * probably wrong anyway). Feel free to refine this value if
2517 * you can find the spec with respective normative text.
2518 */
2519 if (attr_set_level == 10)
2520 ND_PRINT("(too many nested levels, not recursing)");
2521 else if (!bgp_attr_print(ndo, atype, tptr, alen, attr_set_level + 1))
2522 return 0;
2523 tptr += alen;
2524 len -= alen;
2525 }
2526 break;
2527
2528 case BGPTYPE_LARGE_COMMUNITY:
2529 if (len == 0 || len % 12) {
2530 ND_PRINT("invalid len");
2531 break;
2532 }
2533 ND_PRINT("\n\t ");
2534 while (len != 0) {
2535 ND_PRINT("%u:%u:%u%s",
2536 GET_BE_U_4(tptr),
2537 GET_BE_U_4(tptr + 4),
2538 GET_BE_U_4(tptr + 8),
2539 (len > 12) ? ", " : "");
2540 tptr += 12;
2541 /*
2542 * len will always be a multiple of 12, as per the above,
2543 * so this will never underflow.
2544 */
2545 len -= 12;
2546 }
2547 break;
2548 case BGPTYPE_BGPSEC_PATH:
2549 {
2550 uint16_t sblen, splen;
2551
2552 splen = GET_BE_U_2(tptr);
2553
2554 /*
2555 * A secure path has a minimum length of 8 bytes:
2556 * 2 bytes length field
2557 * 6 bytes per secure path segment
2558 */
2559 ND_ICHECKMSG_U("secure path length", splen, <, 8);
2560
2561 ND_PRINT("\n\t Secure Path Length: %u", splen);
2562
2563 tptr += 2;
2564 splen -= 2;
2565 /* Make sure the secure path length does not signal trailing bytes */
2566 if (splen % 6) {
2567 ND_PRINT(" [total segments length %u != N x 6]", splen);
2568 goto invalid;
2569 }
2570
2571 /* Parse secure path segments */
2572 while (splen != 0) {
2573 uint8_t pcount = GET_U_1(tptr);
2574 uint8_t flags = GET_U_1(tptr + 1);
2575 uint32_t asn = GET_BE_U_4(tptr + 2);
2576 ND_PRINT("\n\t Secure Path Segment: pCount: %u, Flags: [%s] (0x%02x), AS: %u",
2577 pcount,
2578 bittok2str(bgp_bgpsec_bitmap_str, "none", flags),
2579 flags,
2580 asn);
2581 tptr += 6;
2582 splen -= 6;
2583 }
2584
2585 sblen = GET_BE_U_2(tptr);
2586
2587 ND_PRINT("\n\t Signature Block: Length: %u, Algo ID: %u",
2588 sblen,
2589 GET_U_1(tptr + 2));
2590
2591 tptr += 3;
2592 sblen -= 3;
2593 /* Parse signature segments */
2594 while (sblen != 0) {
2595 uint16_t siglen;
2596
2597 ND_PRINT("\n\t Signature Segment:\n\t SKI: ");
2598 ND_ICHECKMSG_U("remaining length", sblen, <, 20);
2599 hex_print(ndo, "\n\t ", tptr, 20);
2600 tptr += 20;
2601 sblen -= 20;
2602 ND_ICHECKMSG_U("remaining length", sblen, <, 2);
2603 siglen = GET_BE_U_2(tptr);
2604 tptr += 2;
2605 sblen -= 2;
2606
2607 ND_PRINT("\n\t Length: %u", siglen);
2608 ND_ICHECKMSG_U("remaining length", sblen, <, siglen);
2609 ND_PRINT("\n\t Signature:");
2610 hex_print(ndo, "\n\t ", tptr, siglen);
2611 tptr += siglen;
2612 sblen -= siglen;
2613 }
2614 break;
2615 }
2616 case BGPTYPE_OTC:
2617 {
2618 if (len < 4) {
2619 ND_PRINT("invalid len");
2620 break;
2621 }
2622 ND_PRINT("\n\t OTC %u", GET_BE_U_4(pptr));
2623 break;
2624 }
2625 default:
2626 ND_TCHECK_LEN(pptr, len);
2627 ND_PRINT("\n\t no Attribute %u decoder", atype); /* we have no decoder for the attribute */
2628 if (ndo->ndo_vflag <= 1)
2629 print_unknown_data(ndo, pptr, "\n\t ", len);
2630 break;
2631 }
2632 done:
2633 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2634 ND_TCHECK_LEN(pptr, len);
2635 print_unknown_data(ndo, pptr, "\n\t ", len);
2636 }
2637 return 1;
2638
2639 invalid:
2640 nd_print_invalid(ndo);
2641 return 1;
2642
2643 trunc:
2644 return 0;
2645 }
2646
2647 static void
2648 bgp_capabilities_print(netdissect_options *ndo,
2649 const u_char *opt, u_int caps_len)
2650 {
2651 /* allocate space for the largest possible string */
2652 char astostr[AS_STR_SIZE];
2653 u_int cap_type, cap_len, tcap_len, cap_offset;
2654 u_int i = 0;
2655
2656 while (i < caps_len) {
2657 ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
2658 cap_type=GET_U_1(opt + i);
2659 cap_len=GET_U_1(opt + i + 1);
2660 ND_PRINT("\n\t %s (%u), length: %u",
2661 tok2str(bgp_capcode_values, "Unknown", cap_type),
2662 cap_type,
2663 cap_len);
2664 ND_TCHECK_LEN(opt + 2 + i, cap_len);
2665 switch (cap_type) {
2666 case BGP_CAPCODE_MP:
2667 /* AFI (16 bits), Reserved (8 bits), SAFI (8 bits) */
2668 if (cap_len < 4) {
2669 ND_PRINT(" (too short, < 4)");
2670 return;
2671 }
2672 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u)",
2673 tok2str(af_values, "Unknown", GET_BE_U_2(opt + i + 2)),
2674 GET_BE_U_2(opt + i + 2),
2675 tok2str(bgp_safi_values, "Unknown", GET_U_1(opt + i + 5)),
2676 GET_U_1(opt + i + 5));
2677 break;
2678 case BGP_CAPCODE_BGPSEC:
2679 /* Version (4 bits), Direction (1 bit), Flags (3 bits), AFI (16 bits) */
2680 cap_offset = 1;
2681 /* The capability length [...] MUST be set to 3. */
2682 if (cap_len != 3) {
2683 ND_PRINT(" [%u != 3]", cap_len);
2684 return;
2685 }
2686
2687 ND_PRINT("\n\t\tVersion %u, Direction %s (%u), AFI %s (%u)",
2688 GET_U_1(opt + i + 2)&0xf0,
2689 (GET_U_1(opt + i + 2)&0x08) ? "Send" : "Receive",
2690 (GET_U_1(opt + i + 2)&0x08)>>3,
2691 bittok2str(af_values, "Unknown",
2692 GET_BE_U_2(opt + i + cap_offset + 2)),
2693 GET_BE_U_2(opt + i + cap_offset + 2));
2694 break;
2695 case BGP_CAPCODE_ML:
2696 cap_offset = 2;
2697 tcap_len = cap_len;
2698 while (tcap_len >= 4) {
2699 ND_PRINT( "\n\t\tAFI %s (%u), SAFI %s (%u), Count: %u",
2700 tok2str(af_values, "Unknown",
2701 GET_BE_U_2(opt + i + cap_offset)),
2702 GET_BE_U_2(opt + i + cap_offset),
2703 tok2str(bgp_safi_values, "Unknown",
2704 GET_U_1(opt + i + cap_offset + 2)),
2705 GET_U_1(opt + i + cap_offset + 2),
2706 GET_U_1(opt + i + cap_offset + 3));
2707 tcap_len -= 4;
2708 cap_offset += 4;
2709 }
2710 break;
2711 case BGP_CAPCODE_RESTART:
2712 /* Restart Flags (4 bits), Restart Time in seconds (12 bits) */
2713 if (cap_len < 2) {
2714 ND_PRINT(" (too short, < 2)");
2715 return;
2716 }
2717 tcap_len=cap_len;
2718 ND_PRINT("\n\t\tRestart Flags: [%s], Restart Time %us",
2719 bittok2str(bgp_graceful_restart_comm_flag_values,
2720 "none", GET_U_1(opt + i + 2) >> 4),
2721 GET_BE_U_2(opt + i + 2)&0xfff);
2722 tcap_len-=2;
2723 cap_offset=4;
2724 while(tcap_len>=4) {
2725 ND_PRINT("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2726 tok2str(af_values,"Unknown",
2727 GET_BE_U_2(opt + i + cap_offset)),
2728 GET_BE_U_2(opt + i + cap_offset),
2729 tok2str(bgp_safi_values,"Unknown",
2730 GET_U_1(opt + i + cap_offset + 2)),
2731 GET_U_1(opt + (i + cap_offset + 2)),
2732 ((GET_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" );
2733 tcap_len -= 4;
2734 cap_offset += 4;
2735 }
2736 break;
2737 case BGP_CAPCODE_ROLE:
2738 if (cap_len < 1) {
2739 ND_PRINT(" (too short, < 1)");
2740 return;
2741 }
2742 ND_PRINT("\n\t\tRole name %s (%u)",
2743 tok2str(bgp_role_values, "Unassigned",
2744 GET_U_1(opt + i + 2)), GET_U_1(opt + i + 2));
2745 break;
2746 case BGP_CAPCODE_RR:
2747 case BGP_CAPCODE_LLGR:
2748 case BGP_CAPCODE_RR_CISCO:
2749 case BGP_CAPCODE_EXT_MSG:
2750 case BGP_CAPCODE_ENH_RR:
2751 break;
2752 case BGP_CAPCODE_AS_NEW:
2753 /*
2754 * Extract the 4 byte AS number encoded.
2755 */
2756 if (cap_len < 4) {
2757 ND_PRINT(" (too short, < 4)");
2758 return;
2759 }
2760 ND_PRINT("\n\t\t 4 Byte AS %s",
2761 as_printf(ndo, astostr, sizeof(astostr),
2762 GET_BE_U_4(opt + i + 2)));
2763 break;
2764 case BGP_CAPCODE_ADD_PATH:
2765 if (cap_len == 0) {
2766 ND_PRINT(" (bogus)"); /* length */
2767 break;
2768 }
2769 tcap_len=cap_len;
2770 cap_offset=2;
2771 while (tcap_len != 0) {
2772 if (tcap_len < 4) {
2773 nd_print_invalid(ndo);
2774 break;
2775 }
2776 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2777 tok2str(af_values,"Unknown",GET_BE_U_2(opt + i + cap_offset)),
2778 GET_BE_U_2(opt + i + cap_offset),
2779 tok2str(bgp_safi_values,"Unknown",GET_U_1(opt + i + cap_offset + 2)),
2780 GET_U_1(opt + (i + cap_offset + 2)),
2781 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",GET_U_1(opt + i + cap_offset + 3))
2782 );
2783 tcap_len -= 4;
2784 cap_offset += 4;
2785 }
2786 break;
2787 default:
2788 ND_PRINT("\n\t\tno decoder for Capability %u",
2789 cap_type);
2790 if (ndo->ndo_vflag <= 1)
2791 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2792 cap_len);
2793 break;
2794 }
2795 if (ndo->ndo_vflag > 1 && cap_len != 0) {
2796 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2797 }
2798 i += BGP_CAP_HEADER_SIZE + cap_len;
2799 }
2800 return;
2801
2802 trunc:
2803 nd_print_trunc(ndo);
2804 }
2805
2806 static void
2807 bgp_open_print(netdissect_options *ndo,
2808 const u_char *dat, u_int length)
2809 {
2810 /* allocate space for the largest possible string */
2811 char astostr[AS_STR_SIZE];
2812 const struct bgp_open *bgp_open_header;
2813 u_int optslen;
2814 uint8_t opsttype;
2815 const struct bgp_opt *bgpopt;
2816 const u_char *opt;
2817 u_int i;
2818 uint8_t extended_opt_params = 0;
2819 u_int open_size = BGP_OPEN_SIZE;
2820 u_int opt_size = BGP_OPT_SIZE;
2821
2822 ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
2823 if (length < BGP_OPEN_SIZE)
2824 goto trunc;
2825
2826 bgp_open_header = (const struct bgp_open *)dat;
2827
2828 ND_PRINT("\n\t Version %u, ",
2829 GET_U_1(bgp_open_header->bgpo_version));
2830 ND_PRINT("my AS %s, ",
2831 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(bgp_open_header->bgpo_myas)));
2832 ND_PRINT("Holdtime %us, ",
2833 GET_BE_U_2(bgp_open_header->bgpo_holdtime));
2834 ND_PRINT("ID %s", GET_IPADDR_STRING(bgp_open_header->bgpo_id));
2835 optslen = GET_U_1(bgp_open_header->bgpo_optlen);
2836 opsttype = GET_U_1(bgp_open_header->bgpo_opttype);
2837 if (opsttype == BGP_OPEN_NON_EXT_OPT_TYPE_EXTENDED_LENGTH) {
2838 optslen = GET_BE_U_2(bgp_open_header->bgpo_optlen_extended);
2839 extended_opt_params = 1;
2840 open_size += 3;
2841 opt_size += 1;
2842 }
2843 ND_PRINT("\n\t Optional parameters%s, length: %u",
2844 extended_opt_params ? " (Extended)" : "", optslen);
2845
2846 opt = dat + open_size;
2847 length -= open_size;
2848
2849 i = 0;
2850 while (i < optslen) {
2851 uint8_t opt_type;
2852 uint16_t opt_len;
2853
2854 ND_TCHECK_LEN(opt + i, opt_size);
2855 if (length < opt_size + i)
2856 goto trunc;
2857 bgpopt = (const struct bgp_opt *)(opt + i);
2858 opt_type = GET_U_1(bgpopt->bgpopt_type);
2859 opt_len = extended_opt_params ? GET_BE_U_2(bgpopt->bgpopt_len)
2860 : GET_U_1(bgpopt->bgpopt_len);
2861 if (opt_size + i + opt_len > optslen) {
2862 ND_PRINT("\n\t Option %u, length: %u, goes past the end of the options",
2863 opt_type, opt_len);
2864 break;
2865 }
2866
2867 ND_PRINT("\n\t Option %s (%u), length: %u",
2868 tok2str(bgp_opt_values,"Unknown",opt_type),
2869 opt_type,
2870 opt_len);
2871
2872 /* now let's decode the options we know*/
2873 switch(opt_type) {
2874
2875 case BGP_OPT_CAP:
2876 bgp_capabilities_print(ndo, opt + opt_size + i,
2877 opt_len);
2878 break;
2879
2880 case BGP_OPT_AUTH:
2881 default:
2882 ND_PRINT("\n\t no decoder for option %u",
2883 opt_type);
2884 break;
2885 }
2886 i += opt_size + opt_len;
2887 }
2888 return;
2889 trunc:
2890 nd_print_trunc(ndo);
2891 }
2892
2893 static void
2894 bgp_update_print(netdissect_options *ndo,
2895 const u_char *dat, u_int length)
2896 {
2897 const u_char *p;
2898 u_int withdrawn_routes_len;
2899 char buf[512];
2900 int wpfx;
2901 u_int len;
2902 int i;
2903 int add_path;
2904 u_int path_id = 0;
2905
2906 ND_TCHECK_LEN(dat, BGP_SIZE);
2907 if (length < BGP_SIZE)
2908 goto trunc;
2909 p = dat + BGP_SIZE;
2910 length -= BGP_SIZE;
2911
2912 /* Unfeasible routes */
2913 ND_TCHECK_2(p);
2914 if (length < 2)
2915 goto trunc;
2916 withdrawn_routes_len = GET_BE_U_2(p);
2917 p += 2;
2918 length -= 2;
2919 if (withdrawn_routes_len > 1) {
2920 /*
2921 * Without keeping state from the original NLRI message,
2922 * it's not possible to tell if this a v4 or v6 route,
2923 * so only try to decode it if we're not v6 enabled.
2924 */
2925 ND_TCHECK_LEN(p, withdrawn_routes_len);
2926 if (length < withdrawn_routes_len)
2927 goto trunc;
2928 ND_PRINT("\n\t Withdrawn routes:");
2929 add_path = check_add_path(ndo, p, withdrawn_routes_len, 32);
2930 while (withdrawn_routes_len != 0) {
2931 if (add_path) {
2932 if (withdrawn_routes_len < 4) {
2933 p += withdrawn_routes_len;
2934 length -= withdrawn_routes_len;
2935 break;
2936 }
2937 path_id = GET_BE_U_4(p);
2938 p += 4;
2939 length -= 4;
2940 withdrawn_routes_len -= 4;
2941 }
2942 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
2943 if (wpfx == -1) {
2944 ND_PRINT("\n\t (illegal prefix length)");
2945 break;
2946 } else if (wpfx == -2)
2947 goto trunc; /* bytes left, but not enough */
2948 else {
2949 ND_PRINT("\n\t %s", buf);
2950 if (add_path) {
2951 ND_PRINT(" Path Id: %u", path_id);
2952 }
2953 p += wpfx;
2954 length -= wpfx;
2955 withdrawn_routes_len -= wpfx;
2956 }
2957 }
2958 } else {
2959 ND_TCHECK_LEN(p, withdrawn_routes_len);
2960 if (length < withdrawn_routes_len)
2961 goto trunc;
2962 p += withdrawn_routes_len;
2963 length -= withdrawn_routes_len;
2964 }
2965
2966 ND_TCHECK_2(p);
2967 if (length < 2)
2968 goto trunc;
2969 len = GET_BE_U_2(p);
2970 p += 2;
2971 length -= 2;
2972
2973 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2974 /* No withdrawn routes, no path attributes, no NLRI */
2975 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2976 return;
2977 }
2978
2979 if (len) {
2980 /* Make sure the path attributes don't go past the end of the packet */
2981 if (length < len)
2982 goto trunc;
2983 /* do something more useful!*/
2984 while (len) {
2985 uint8_t aflags, atype, alenlen;
2986 uint16_t alen;
2987
2988 ND_TCHECK_2(p);
2989 if (length < 2)
2990 goto trunc;
2991 if (len < 2) {
2992 ND_PRINT("\n\t [path attrs too short]");
2993 p += len;
2994 length -= len;
2995 break;
2996 }
2997 aflags = GET_U_1(p);
2998 atype = GET_U_1(p + 1);
2999 p += 2;
3000 len -= 2;
3001 length -= 2;
3002 alenlen = bgp_attr_lenlen(aflags, p);
3003 ND_TCHECK_LEN(p, alenlen);
3004 if (length < alenlen)
3005 goto trunc;
3006 if (len < alenlen) {
3007 ND_PRINT("\n\t [path attrs too short]");
3008 p += len;
3009 length -= len;
3010 break;
3011 }
3012 alen = bgp_attr_len(aflags, p);
3013 p += alenlen;
3014 len -= alenlen;
3015 length -= alenlen;
3016
3017 ND_PRINT("\n\t %s (%u), length: %u",
3018 tok2str(bgp_attr_values, "Unknown Attribute", atype),
3019 atype,
3020 alen);
3021
3022 if (aflags) {
3023 ND_PRINT(", Flags [%s",
3024 bittok2str_nosep(bgp_flags, "", aflags));
3025 if (aflags & 0xf)
3026 ND_PRINT("+%x", aflags & 0xf);
3027 ND_PRINT("]: ");
3028 }
3029 if (len < alen) {
3030 ND_PRINT(" [path attrs too short]");
3031 p += len;
3032 length -= len;
3033 break;
3034 }
3035 if (length < alen)
3036 goto trunc;
3037 if (!bgp_attr_print(ndo, atype, p, alen, 0))
3038 goto trunc;
3039 p += alen;
3040 len -= alen;
3041 length -= alen;
3042 }
3043 }
3044
3045 if (length) {
3046 add_path = check_add_path(ndo, p, length, 32);
3047 ND_PRINT("\n\t Updated routes:");
3048 while (length != 0) {
3049 if (add_path) {
3050 ND_TCHECK_4(p);
3051 if (length < 4)
3052 goto trunc;
3053 path_id = GET_BE_U_4(p);
3054 p += 4;
3055 length -= 4;
3056 }
3057 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
3058 if (i == -1) {
3059 ND_PRINT("\n\t (illegal prefix length)");
3060 break;
3061 } else if (i == -2)
3062 goto trunc; /* bytes left, but not enough */
3063 else {
3064 ND_PRINT("\n\t %s", buf);
3065 if (add_path) {
3066 ND_PRINT(" Path Id: %u", path_id);
3067 }
3068 p += i;
3069 length -= i;
3070 }
3071 }
3072 }
3073 return;
3074 trunc:
3075 nd_print_trunc(ndo);
3076 }
3077
3078 static void
3079 bgp_notification_print_code(netdissect_options *ndo,
3080 const u_char *dat, u_int length,
3081 uint8_t bgpn_major, uint8_t bgpn_minor)
3082 {
3083 ND_PRINT(", %s (%u)",
3084 tok2str(bgp_notify_major_values, "Unknown Error",
3085 bgpn_major),
3086 bgpn_major);
3087
3088 switch (bgpn_major) {
3089
3090 case BGP_NOTIFY_MAJOR_MSG:
3091 ND_PRINT(", subcode %s (%u)",
3092 tok2str(bgp_notify_minor_msg_values, "Unknown",
3093 bgpn_minor),
3094 bgpn_minor);
3095 break;
3096 case BGP_NOTIFY_MAJOR_OPEN:
3097 ND_PRINT(", subcode %s (%u)",
3098 tok2str(bgp_notify_minor_open_values, "Unknown",
3099 bgpn_minor),
3100 bgpn_minor);
3101 break;
3102 case BGP_NOTIFY_MAJOR_UPDATE:
3103 ND_PRINT(", subcode %s (%u)",
3104 tok2str(bgp_notify_minor_update_values, "Unknown",
3105 bgpn_minor),
3106 bgpn_minor);
3107 break;
3108 case BGP_NOTIFY_MAJOR_FSM:
3109 ND_PRINT(" subcode %s (%u)",
3110 tok2str(bgp_notify_minor_fsm_values, "Unknown",
3111 bgpn_minor),
3112 bgpn_minor);
3113 break;
3114 case BGP_NOTIFY_MAJOR_ROUTEREFRESH:
3115 ND_PRINT(" subcode %s (%u)",
3116 tok2str(bgp_notify_minor_routerefresh_values, "Unknown",
3117 bgpn_minor),
3118 bgpn_minor);
3119 break;
3120 case BGP_NOTIFY_MAJOR_CEASE:
3121 ND_PRINT(", subcode %s (%u)",
3122 tok2str(bgp_notify_minor_cease_values, "Unknown",
3123 bgpn_minor),
3124 bgpn_minor);
3125
3126 /* RFC 4486 mentions optionally 7 bytes
3127 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
3128 */
3129 if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= 7) {
3130 ND_PRINT(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
3131 tok2str(af_values, "Unknown", GET_BE_U_2(dat)),
3132 GET_BE_U_2(dat),
3133 tok2str(bgp_safi_values, "Unknown", GET_U_1((dat + 2))),
3134 GET_U_1((dat + 2)),
3135 GET_BE_U_4(dat + 3));
3136 }
3137 /*
3138 * RFC 9003 describes a method to send a communication
3139 * intended for human consumption regarding the Administrative Shutdown
3140 */
3141 if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
3142 bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
3143 length >= 1) {
3144 uint8_t shutdown_comm_length = GET_U_1(dat);
3145 uint8_t remainder_offset = 0;
3146 /* garbage, hexdump it all */
3147 if (shutdown_comm_length > length - 1) {
3148 ND_PRINT(", invalid Shutdown Communication length");
3149 } else if (shutdown_comm_length == 0) {
3150 ND_PRINT(", empty Shutdown Communication");
3151 remainder_offset += 1;
3152 }
3153 /* a proper shutdown communication */
3154 else {
3155 ND_PRINT(", Shutdown Communication (length: %u): \"", shutdown_comm_length);
3156 nd_printjn(ndo, dat+1, shutdown_comm_length);
3157 ND_PRINT("\"");
3158 remainder_offset += shutdown_comm_length + 1;
3159 }
3160 /* if there is trailing data, hexdump it */
3161 if(length - remainder_offset > 0) {
3162 ND_PRINT(", Data: (length: %u)", length - remainder_offset);
3163 hex_print(ndo, "\n\t\t", dat + remainder_offset, length - remainder_offset);
3164 }
3165 }
3166 /*
3167 * RFC8538 describes the Hard Reset cease subcode, which contains another
3168 * notification code and subcode.
3169 */
3170 if (bgpn_minor == BGP_NOTIFY_MINOR_CEASE_HARDRESET && length >= 2) {
3171 bgpn_major = GET_U_1(dat++);
3172 bgpn_minor = GET_U_1(dat++);
3173 length -= 2;
3174 bgp_notification_print_code(ndo, dat, length, bgpn_major, bgpn_minor);
3175 }
3176 break;
3177 default:
3178 if (bgpn_minor != 0) {
3179 ND_PRINT(", subcode %u", bgpn_minor);
3180 }
3181 break;
3182 }
3183
3184 return;
3185 }
3186
3187 static void
3188 bgp_notification_print(netdissect_options *ndo,
3189 const u_char *dat, u_int length)
3190 {
3191 const struct bgp_notification *bgp_notification_header;
3192 uint8_t bgpn_major, bgpn_minor;
3193
3194 ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
3195 if (length<BGP_NOTIFICATION_SIZE)
3196 return;
3197
3198 bgp_notification_header = (const struct bgp_notification *)dat;
3199 bgpn_major = GET_U_1(bgp_notification_header->bgpn_major);
3200 bgpn_minor = GET_U_1(bgp_notification_header->bgpn_minor);
3201 bgp_notification_print_code(ndo, dat + BGP_NOTIFICATION_SIZE,
3202 length - BGP_NOTIFICATION_SIZE, bgpn_major, bgpn_minor);
3203 return;
3204 trunc:
3205 nd_print_trunc(ndo);
3206 }
3207
3208 static void
3209 bgp_route_refresh_print(netdissect_options *ndo,
3210 const u_char *pptr, u_int len)
3211 {
3212 const struct bgp_route_refresh *bgp_route_refresh_header;
3213
3214 /* some little sanity checking */
3215 if (len<BGP_ROUTE_REFRESH_SIZE)
3216 return;
3217
3218 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
3219
3220 ND_PRINT("\n\t AFI %s (%u), SAFI %s (%u), Subtype %s (%u)",
3221 tok2str(af_values, "Unknown",
3222 GET_BE_U_2(bgp_route_refresh_header->afi)),
3223 GET_BE_U_2(bgp_route_refresh_header->afi),
3224 tok2str(bgp_safi_values, "Unknown",
3225 GET_U_1(bgp_route_refresh_header->safi)),
3226 GET_U_1(bgp_route_refresh_header->safi),
3227 tok2str(bgp_route_refresh_subtype_values, "Unknown",
3228 GET_U_1(bgp_route_refresh_header->subtype)),
3229 GET_U_1(bgp_route_refresh_header->subtype));
3230
3231 /* ORF */
3232 if (len >= BGP_ROUTE_REFRESH_SIZE_ORF) {
3233 const struct bgp_route_refresh_orf *orf_header;
3234
3235 orf_header =
3236 (const struct bgp_route_refresh_orf *)(pptr + BGP_ROUTE_REFRESH_SIZE);
3237
3238 ND_PRINT("\n\t ORF refresh %s (%u), ORF type %s (%u), ORF length %u",
3239 tok2str(bgp_orf_refresh_type, "Unknown",
3240 GET_U_1(orf_header->refresh)),
3241 GET_U_1(orf_header->refresh),
3242 tok2str(bgp_orf_type, "Unknown", GET_U_1(orf_header->type)),
3243 GET_U_1(orf_header->type), GET_BE_U_2(orf_header->len));
3244 }
3245
3246 if (ndo->ndo_vflag > 1) {
3247 ND_TCHECK_LEN(pptr, len);
3248 print_unknown_data(ndo, pptr, "\n\t ", len);
3249 }
3250
3251 return;
3252 trunc:
3253 nd_print_trunc(ndo);
3254 }
3255
3256 static int
3257 bgp_pdu_print(netdissect_options *ndo,
3258 const u_char *dat, u_int length)
3259 {
3260 const struct bgp *bgp_header;
3261 uint8_t bgp_type;
3262
3263 ND_TCHECK_LEN(dat, BGP_SIZE);
3264 bgp_header = (const struct bgp *)dat;
3265 bgp_type = GET_U_1(bgp_header->bgp_type);
3266
3267 ND_PRINT("\n\t%s Message (%u), length: %u",
3268 tok2str(bgp_msg_values, "Unknown", bgp_type),
3269 bgp_type,
3270 length);
3271
3272 switch (bgp_type) {
3273 case BGP_OPEN:
3274 bgp_open_print(ndo, dat, length);
3275 break;
3276 case BGP_UPDATE:
3277 bgp_update_print(ndo, dat, length);
3278 break;
3279 case BGP_NOTIFICATION:
3280 bgp_notification_print(ndo, dat, length);
3281 break;
3282 case BGP_KEEPALIVE:
3283 break;
3284 case BGP_ROUTE_REFRESH:
3285 bgp_route_refresh_print(ndo, dat, length);
3286 break;
3287 default:
3288 /* we have no decoder for the BGP message */
3289 ND_TCHECK_LEN(dat, length);
3290 ND_PRINT("\n\t no Message %u decoder", bgp_type);
3291 print_unknown_data(ndo, dat, "\n\t ", length);
3292 break;
3293 }
3294 return 1;
3295 trunc:
3296 nd_print_trunc(ndo);
3297 return 0;
3298 }
3299
3300 void
3301 bgp_print(netdissect_options *ndo,
3302 const u_char *dat, u_int length _U_)
3303 {
3304 const u_char *p;
3305 const u_char *ep = ndo->ndo_snapend;
3306 const u_char *start;
3307 const u_char marker[] = {
3308 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3309 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3310 };
3311 const struct bgp *bgp_header;
3312 uint16_t hlen;
3313
3314 ndo->ndo_protocol = "bgp";
3315 ND_PRINT(": BGP");
3316
3317 if (ndo->ndo_vflag < 1) /* lets be less chatty */
3318 return;
3319
3320 p = dat;
3321 start = p;
3322 while (p < ep) {
3323 if (!ND_TTEST_1(p))
3324 break;
3325 if (GET_U_1(p) != 0xff) {
3326 p++;
3327 continue;
3328 }
3329
3330 if (!ND_TTEST_LEN(p, sizeof(marker)))
3331 break;
3332 if (memcmp(p, marker, sizeof(marker)) != 0) {
3333 p++;
3334 continue;
3335 }
3336
3337 /* found BGP header */
3338 ND_TCHECK_LEN(p, BGP_SIZE);
3339 bgp_header = (const struct bgp *)p;
3340
3341 if (start != p)
3342 nd_print_trunc(ndo);
3343
3344 hlen = GET_BE_U_2(bgp_header->bgp_len);
3345 if (hlen < BGP_SIZE) {
3346 ND_PRINT("\nmessage length %u < %u", hlen, BGP_SIZE);
3347 nd_print_invalid(ndo);
3348 break;
3349 }
3350
3351 if (ND_TTEST_LEN(p, hlen)) {
3352 if (!bgp_pdu_print(ndo, p, hlen))
3353 return;
3354 p += hlen;
3355 start = p;
3356 } else {
3357 ND_PRINT("\n[|BGP %s]",
3358 tok2str(bgp_msg_values,
3359 "Unknown Message Type",
3360 GET_U_1(bgp_header->bgp_type)));
3361 break;
3362 }
3363 }
3364
3365 return;
3366
3367 trunc:
3368 nd_print_trunc(ndo);
3369 }
[mirror] the TCPdump network dissector