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Makefile.in: Add the releasecheck target
[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_ATTR_SET 128 /* RFC6368 */
178
179 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
180
181 static const struct tok bgp_attr_values[] = {
182 { BGPTYPE_ORIGIN, "Origin"},
183 { BGPTYPE_AS_PATH, "AS Path"},
184 { BGPTYPE_AS4_PATH, "AS4 Path"},
185 { BGPTYPE_NEXT_HOP, "Next Hop"},
186 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
187 { BGPTYPE_LOCAL_PREF, "Local Preference"},
188 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
189 { BGPTYPE_AGGREGATOR, "Aggregator"},
190 { BGPTYPE_AGGREGATOR4, "Aggregator4"},
191 { BGPTYPE_COMMUNITIES, "Community"},
192 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
193 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
194 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
195 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
196 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
197 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
198 { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"},
199 { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"},
200 { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
201 { BGPTYPE_AIGP, "Accumulated IGP Metric"},
202 { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
203 { BGPTYPE_ENTROPY_LABEL, "Entropy Label"},
204 { BGPTYPE_LARGE_COMMUNITY, "Large Community"},
205 { BGPTYPE_BGPSEC_PATH, "BGPsec Path"},
206 { BGPTYPE_ATTR_SET, "Attribute Set"},
207 { 255, "Reserved for development"},
208 { 0, NULL}
209 };
210
211 #define BGP_AS_SET 1
212 #define BGP_AS_SEQUENCE 2
213 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
214 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
215
216 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
217 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
218
219 static const struct tok bgp_as_path_segment_open_values[] = {
220 { BGP_AS_SEQUENCE, ""},
221 { BGP_AS_SET, "{ "},
222 { BGP_CONFED_AS_SEQUENCE, "( "},
223 { BGP_CONFED_AS_SET, "({ "},
224 { 0, NULL}
225 };
226
227 static const struct tok bgp_as_path_segment_close_values[] = {
228 { BGP_AS_SEQUENCE, ""},
229 { BGP_AS_SET, "}"},
230 { BGP_CONFED_AS_SEQUENCE, ")"},
231 { BGP_CONFED_AS_SET, "})"},
232 { 0, NULL}
233 };
234
235 #define BGP_OPT_AUTH 1
236 #define BGP_OPT_CAP 2
237
238 static const struct tok bgp_opt_values[] = {
239 { BGP_OPT_AUTH, "Authentication Information"},
240 { BGP_OPT_CAP, "Capabilities Advertisement"},
241 { 0, NULL}
242 };
243
244 #define BGP_CAPCODE_MP 1 /* RFC2858 */
245 #define BGP_CAPCODE_RR 2 /* RFC2918 */
246 #define BGP_CAPCODE_ORF 3 /* RFC5291 */
247 #define BGP_CAPCODE_MR 4 /* RFC3107 */
248 #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */
249 #define BGP_CAPCODE_EXT_MSG 6 /* RFC8654 */
250 #define BGP_CAPCODE_BGPSEC 7 /* RFC8205 */
251 #define BGP_CAPCODE_ML 8 /* RFC8277 */
252 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */
253 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
254 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
255 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
256 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
257 #define BGP_CAPCODE_ENH_RR 70 /* RFC7313 */
258 #define BGP_CAPCODE_LLGR 71 /* draft-uttaro-idr-bgp-persistence-05 */
259 #define BGP_CAPCODE_RR_CISCO 128
260
261 static const struct tok bgp_capcode_values[] = {
262 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
263 { BGP_CAPCODE_RR, "Route Refresh"},
264 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
265 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
266 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
267 { BGP_CAPCODE_EXT_MSG, "BGP Extended Message"},
268 { BGP_CAPCODE_BGPSEC, "BGPsec"},
269 { BGP_CAPCODE_ML, "Multiple Labels"},
270 { BGP_CAPCODE_RESTART, "Graceful Restart"},
271 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
272 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
273 { BGP_CAPCODE_MULTISESS, "Multisession BGP"},
274 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
275 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
276 { BGP_CAPCODE_LLGR, "Long-lived Graceful Restart"},
277 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
278 { 0, NULL}
279 };
280
281 #define BGP_NOTIFY_MAJOR_MSG 1
282 #define BGP_NOTIFY_MAJOR_OPEN 2
283 #define BGP_NOTIFY_MAJOR_UPDATE 3
284 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
285 #define BGP_NOTIFY_MAJOR_FSM 5
286 #define BGP_NOTIFY_MAJOR_CEASE 6
287 #define BGP_NOTIFY_MAJOR_CAP 7
288
289 static const struct tok bgp_notify_major_values[] = {
290 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
291 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
292 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
293 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
294 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
295 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
296 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"},
297 { 0, NULL}
298 };
299
300 /* RFC 4486 */
301 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
302 /* RFC 9003 */
303 #define BGP_NOTIFY_MINOR_CEASE_SHUT 2
304 #define BGP_NOTIFY_MINOR_CEASE_RESET 4
305 /* RFC 8538 */
306 #define BGP_NOTIFY_MINOR_CEASE_HARDRESET 9
307 static const struct tok bgp_notify_minor_cease_values[] = {
308 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
309 { BGP_NOTIFY_MINOR_CEASE_SHUT, "Administrative Shutdown"},
310 { 3, "Peer Unconfigured"},
311 { BGP_NOTIFY_MINOR_CEASE_RESET, "Administrative Reset"},
312 { 5, "Connection Rejected"},
313 { 6, "Other Configuration Change"},
314 { 7, "Connection Collision Resolution"},
315 { 8, "Out of Resources"},
316 { BGP_NOTIFY_MINOR_CEASE_HARDRESET, "Hard Reset"},
317 { 10, "BFD Down"},
318 { 0, NULL}
319 };
320
321 static const struct tok bgp_notify_minor_msg_values[] = {
322 { 1, "Connection Not Synchronized"},
323 { 2, "Bad Message Length"},
324 { 3, "Bad Message Type"},
325 { 0, NULL}
326 };
327
328 static const struct tok bgp_notify_minor_open_values[] = {
329 { 1, "Unsupported Version Number"},
330 { 2, "Bad Peer AS"},
331 { 3, "Bad BGP Identifier"},
332 { 4, "Unsupported Optional Parameter"},
333 { 5, "Authentication Failure"},
334 { 6, "Unacceptable Hold Time"},
335 { 7, "Capability Message Error"},
336 { 0, NULL}
337 };
338
339 static const struct tok bgp_notify_minor_update_values[] = {
340 { 1, "Malformed Attribute List"},
341 { 2, "Unrecognized Well-known Attribute"},
342 { 3, "Missing Well-known Attribute"},
343 { 4, "Attribute Flags Error"},
344 { 5, "Attribute Length Error"},
345 { 6, "Invalid ORIGIN Attribute"},
346 { 7, "AS Routing Loop"},
347 { 8, "Invalid NEXT_HOP Attribute"},
348 { 9, "Optional Attribute Error"},
349 { 10, "Invalid Network Field"},
350 { 11, "Malformed AS_PATH"},
351 { 0, NULL}
352 };
353
354 static const struct tok bgp_notify_minor_fsm_values[] = {
355 { 0, "Unspecified Error"},
356 { 1, "In OpenSent State"},
357 { 2, "In OpenConfirm State"},
358 { 3, "In Established State"},
359 { 0, NULL }
360 };
361
362 static const struct tok bgp_notify_minor_cap_values[] = {
363 { 1, "Invalid Action Value" },
364 { 2, "Invalid Capability Length" },
365 { 3, "Malformed Capability Value" },
366 { 4, "Unsupported Capability Code" },
367 { 0, NULL }
368 };
369
370 static const struct tok bgp_origin_values[] = {
371 { 0, "IGP"},
372 { 1, "EGP"},
373 { 2, "Incomplete"},
374 { 0, NULL}
375 };
376
377 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1
378 #define BGP_PMSI_TUNNEL_LDP_P2MP 2
379 #define BGP_PMSI_TUNNEL_PIM_SSM 3
380 #define BGP_PMSI_TUNNEL_PIM_SM 4
381 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5
382 #define BGP_PMSI_TUNNEL_INGRESS 6
383 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7
384
385 static const struct tok bgp_pmsi_tunnel_values[] = {
386 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
387 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
388 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
389 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
390 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
391 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
392 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
393 { 0, NULL}
394 };
395
396 static const struct tok bgp_pmsi_flag_values[] = {
397 { 0x01, "Leaf Information required"},
398 { 0, NULL}
399 };
400
401 #define BGP_AIGP_TLV 1
402
403 static const struct tok bgp_aigp_values[] = {
404 { BGP_AIGP_TLV, "AIGP"},
405 { 0, NULL}
406 };
407
408 /* Subsequent address family identifier, RFC2283 section 7 */
409 #define SAFNUM_RES 0
410 #define SAFNUM_UNICAST 1
411 #define SAFNUM_MULTICAST 2
412 #define SAFNUM_UNIMULTICAST 3 /* deprecated now */
413 /* labeled BGP RFC3107 */
414 #define SAFNUM_LABUNICAST 4
415 /* RFC6514 */
416 #define SAFNUM_MULTICAST_VPN 5
417 /* draft-nalawade-kapoor-tunnel-safi */
418 #define SAFNUM_TUNNEL 64
419 /* RFC4761 */
420 #define SAFNUM_VPLS 65
421 /* RFC6037 */
422 #define SAFNUM_MDT 66
423 /* RFC7432 */
424 #define SAFNUM_EVPN 70
425 /* RFC4364 */
426 #define SAFNUM_VPNUNICAST 128
427 /* RFC6513 */
428 #define SAFNUM_VPNMULTICAST 129
429 #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */
430 /* RFC4684 */
431 #define SAFNUM_RT_ROUTING_INFO 132
432
433 #define BGP_VPN_RD_LEN 8
434
435 static const struct tok bgp_safi_values[] = {
436 { SAFNUM_RES, "Reserved"},
437 { SAFNUM_UNICAST, "Unicast"},
438 { SAFNUM_MULTICAST, "Multicast"},
439 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
440 { SAFNUM_LABUNICAST, "labeled Unicast"},
441 { SAFNUM_TUNNEL, "Tunnel"},
442 { SAFNUM_VPLS, "VPLS"},
443 { SAFNUM_MDT, "MDT"},
444 { SAFNUM_EVPN, "EVPN"},
445 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
446 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
447 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
448 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
449 { SAFNUM_MULTICAST_VPN, "Multicast VPN"},
450 { 0, NULL }
451 };
452
453 static const struct tok bgp_graceful_restart_comm_flag_values[] = {
454 { 0x8, "R" },
455 { 0x4, "N" },
456 { 0, NULL }
457 };
458
459 /* well-known community */
460 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
461 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
462 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
463
464 /* Extended community type - RFC 4360 */
465 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
466 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
467 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
468 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
469 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
470 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
471 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
472 #define BGP_EXT_COM_OVS 0x4300 /* BGP Prefix Origin Validation State Extended Community */
473 /* rfc2547 bgp-mpls-vpns */
474 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
475 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatibility */
476 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatibility */
477 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatibility */
478
479 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
480 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatibility */
481 #define BGP_EXT_COM_ENCAP 0x030c /* rfc5512 */
482
483 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
484 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatibility */
485
486 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
487
488 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
489 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
490 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
491 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */
492
493 /* https://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */
494 #define BGP_EXT_COM_EIGRP_GEN 0x8800
495 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801
496 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
497 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803
498 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804
499 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
500
501 /* Optional Parameters */
502 #define BGP_OPEN_NON_EXT_OPT_TYPE_EXTENDED_LENGTH 255 /* Non-Ext OP Type */
503
504 static const struct tok bgp_extd_comm_flag_values[] = {
505 { 0x8000, "vendor-specific"},
506 { 0x4000, "non-transitive"},
507 { 0, NULL},
508 };
509
510 /* rfc8097 */
511 static const struct tok bgp_prefix_origin_validation_state[] = {
512 { 0, "valid" },
513 { 1, "not found" },
514 { 2, "invalid" },
515 { 0, NULL },
516 };
517
518 static const struct tok bgp_extd_comm_subtype_values[] = {
519 { BGP_EXT_COM_RT_0, "target"},
520 { BGP_EXT_COM_RT_1, "target"},
521 { BGP_EXT_COM_RT_2, "target"},
522 { BGP_EXT_COM_RO_0, "origin"},
523 { BGP_EXT_COM_RO_1, "origin"},
524 { BGP_EXT_COM_RO_2, "origin"},
525 { BGP_EXT_COM_LINKBAND, "link-BW"},
526 { BGP_EXT_COM_OVS, "origin-validation-state"},
527 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
528 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
529 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
530 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
531 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
532 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
533 { BGP_EXT_COM_ENCAP, "encapsulation"},
534 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
535 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
536 { BGP_EXT_COM_L2INFO, "layer2-info"},
537 { BGP_EXT_COM_EIGRP_GEN, "eigrp-general-route (flag, tag)" },
538 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY, "eigrp-route-metric (AS, delay)" },
539 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW, "eigrp-route-metric (reliability, nexthop, bandwidth)" },
540 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU, "eigrp-route-metric (load, MTU)" },
541 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID, "eigrp-external-route (remote-AS, remote-ID)" },
542 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC, "eigrp-external-route (remote-proto, remote-metric)" },
543 { BGP_EXT_COM_SOURCE_AS, "source-AS" },
544 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
545 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
546 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
547 { 0, NULL},
548 };
549
550 /* RFC RFC5512 BGP Tunnel Encapsulation Attribute Tunnel Types */
551 #define BGP_ENCAP_TUNNEL_L2TPV3_IP 1
552 #define BGP_ENCAP_TUNNEL_GRE 2
553 #define BGP_ENCAP_TUNNEL_TRANSMIT 3
554 #define BGP_ENCAP_TUNNEL_IPSEC 4
555 #define BGP_ENCAP_TUNNEL_IP_IPSEC 5
556 #define BGP_ENCAP_TUNNEL_MPLS_IP 6
557 #define BGP_ENCAP_TUNNEL_IP_IP 7
558 #define BGP_ENCAP_TUNNEL_VXLAN 8
559 #define BGP_ENCAP_TUNNEL_NVGRE 9
560 #define BGP_ENCAP_TUNNEL_MPLS 10
561 #define BGP_ENCAP_TUNNEL_MPLS_GRE 11
562 #define BGP_ENCAP_TUNNEL_VXLAN_GPE 12
563 #define BGP_ENCAP_TUNNEL_MPLS_UDP 13
564 #define BGP_ENCAP_TUNNEL_IPV6 14
565 #define BGP_ENCAP_TUNNEL_SR_TE 15
566 #define BGP_ENCAP_TUNNEL_BARE 16
567 #define BGP_ENCAP_TUNNEL_SR 17
568
569 static const struct tok bgp_extd_comm_encap_tunnel_values[] = {
570 { BGP_ENCAP_TUNNEL_L2TPV3_IP, "L2TPv3 over IP"},
571 { BGP_ENCAP_TUNNEL_GRE, "GRE"},
572 { BGP_ENCAP_TUNNEL_TRANSMIT, "Transmit Tunnel"},
573 { BGP_ENCAP_TUNNEL_IPSEC, "IPsec"},
574 { BGP_ENCAP_TUNNEL_IP_IPSEC, "IP in IP with IPsec"},
575 { BGP_ENCAP_TUNNEL_MPLS_IP, "MPLS in IP with IPsec"},
576 { BGP_ENCAP_TUNNEL_IP_IP, "IP in IP"},
577 { BGP_ENCAP_TUNNEL_VXLAN, "VXLAN"},
578 { BGP_ENCAP_TUNNEL_NVGRE, "NVGRE"},
579 { BGP_ENCAP_TUNNEL_MPLS, "MPLS"},
580 { BGP_ENCAP_TUNNEL_MPLS_GRE, "MPLS in GRE"},
581 { BGP_ENCAP_TUNNEL_VXLAN_GPE, "VXLAN GPE"},
582 { BGP_ENCAP_TUNNEL_MPLS_UDP, "MPLS in UDP"},
583 { BGP_ENCAP_TUNNEL_IPV6, "IPv6"},
584 { BGP_ENCAP_TUNNEL_SR_TE, "SR TE"},
585 { BGP_ENCAP_TUNNEL_BARE, "Bare"},
586 { BGP_ENCAP_TUNNEL_SR, "SR"},
587 { 0, NULL},
588 };
589
590 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
591 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
592 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
593 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
594 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
595 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
596 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
597 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
598
599 static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
600 { BGP_OSPF_RTYPE_RTR, "Router" },
601 { BGP_OSPF_RTYPE_NET, "Network" },
602 { BGP_OSPF_RTYPE_SUM, "Summary" },
603 { BGP_OSPF_RTYPE_EXT, "External" },
604 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
605 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
606 { 0, NULL },
607 };
608
609 /* ADD-PATH Send/Receive field values */
610 static const struct tok bgp_add_path_recvsend[] = {
611 { 1, "Receive" },
612 { 2, "Send" },
613 { 3, "Both" },
614 { 0, NULL },
615 };
616
617 static const struct tok bgp_bgpsec_bitmap_str[] = {
618 { 1U << 0, "MBZ-0" },
619 { 1U << 1, "MBZ-1" },
620 { 1U << 2, "MBZ-2" },
621 { 1U << 3, "MBZ-3" },
622 { 1U << 4, "MBZ-4" },
623 { 1U << 5, "MBZ-5" },
624 { 1U << 6, "MBZ-6" },
625 { 1U << 7, "C" },
626 { 0, NULL}
627 };
628
629 #define AS_STR_SIZE sizeof("xxxxx.xxxxx")
630
631 /*
632 * as_printf
633 *
634 * Convert an AS number into a string and return string pointer.
635 *
636 * Depending on bflag is set or not, AS number is converted into ASDOT notation
637 * or plain number notation.
638 *
639 */
640 static char *
641 as_printf(netdissect_options *ndo,
642 char *str, size_t size, u_int asnum)
643 {
644 if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
645 snprintf(str, size, "%u", asnum);
646 } else {
647 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
648 }
649 return str;
650 }
651
652 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
653
654 int
655 decode_prefix4(netdissect_options *ndo,
656 const u_char *pptr, u_int itemlen, char *buf, size_t buflen)
657 {
658 nd_ipv4 addr;
659 u_int plen, plenbytes;
660
661 ITEMCHECK(1);
662 plen = GET_U_1(pptr);
663 if (32 < plen)
664 return -1;
665 itemlen -= 1;
666
667 memset(&addr, 0, sizeof(addr));
668 plenbytes = (plen + 7) / 8;
669 ITEMCHECK(plenbytes);
670 GET_CPY_BYTES(&addr, pptr + 1, plenbytes);
671 if (plen % 8) {
672 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
673 }
674 snprintf(buf, buflen, "%s/%u", ipaddr_string(ndo, (const u_char *)&addr), plen);
675 return 1 + plenbytes;
676
677 badtlv:
678 return -2;
679 }
680
681 static int
682 decode_labeled_prefix4(netdissect_options *ndo,
683 const u_char *pptr, u_int itemlen, char *buf,
684 size_t buflen)
685 {
686 nd_ipv4 addr;
687 u_int plen, plenbytes;
688
689 /* prefix length and label = 4 bytes */
690 ND_TCHECK_4(pptr);
691 ITEMCHECK(4);
692 plen = GET_U_1(pptr); /* get prefix length */
693
694 /* this is one of the weirdnesses of rfc3107
695 the label length (actually the label + COS bits)
696 is added to the prefix length;
697 we also do only read out just one label -
698 there is no real application for advertisement of
699 stacked labels in a single BGP message
700 */
701
702 if (24 > plen)
703 return -1;
704
705 plen-=24; /* adjust prefixlen - labellength */
706
707 if (32 < plen)
708 return -1;
709 itemlen -= 4;
710
711 memset(&addr, 0, sizeof(addr));
712 plenbytes = (plen + 7) / 8;
713 ITEMCHECK(plenbytes);
714 GET_CPY_BYTES(&addr, pptr + 4, plenbytes);
715 if (plen % 8) {
716 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
717 }
718 /* the label may get offsetted by 4 bits so lets shift it right */
719 snprintf(buf, buflen, "%s/%u, label:%u %s",
720 ipaddr_string(ndo, (const u_char *)&addr),
721 plen,
722 GET_BE_U_3(pptr + 1)>>4,
723 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
724
725 return 4 + plenbytes;
726
727 trunc:
728 return -2;
729
730 badtlv:
731 return -3;
732 }
733
734 /*
735 * bgp_vpn_ip_print
736 *
737 * print an ipv4 or ipv6 address into a buffer dependent on address length.
738 */
739 static char *
740 bgp_vpn_ip_print(netdissect_options *ndo,
741 const u_char *pptr, u_int addr_length)
742 {
743
744 /* worst case string is s fully formatted v6 address */
745 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
746 char *pos = addr;
747
748 switch(addr_length) {
749 case (sizeof(nd_ipv4) << 3): /* 32 */
750 snprintf(pos, sizeof(addr), "%s", GET_IPADDR_STRING(pptr));
751 break;
752 case (sizeof(nd_ipv6) << 3): /* 128 */
753 snprintf(pos, sizeof(addr), "%s", GET_IP6ADDR_STRING(pptr));
754 break;
755 default:
756 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
757 break;
758 }
759 pos += strlen(pos);
760
761 *(pos) = '\0';
762 return (addr);
763 }
764
765 /*
766 * bgp_vpn_sg_print
767 *
768 * print an multicast s,g entry into a buffer.
769 * the s,g entry is encoded like this.
770 *
771 * +-----------------------------------+
772 * | Multicast Source Length (1 octet) |
773 * +-----------------------------------+
774 * | Multicast Source (Variable) |
775 * +-----------------------------------+
776 * | Multicast Group Length (1 octet) |
777 * +-----------------------------------+
778 * | Multicast Group (Variable) |
779 * +-----------------------------------+
780 *
781 * return the number of bytes read from the wire.
782 */
783 static u_int
784 bgp_vpn_sg_print(netdissect_options *ndo,
785 const u_char *pptr, char *buf, size_t buflen)
786 {
787 uint8_t addr_length;
788 u_int total_length, offset;
789
790 total_length = 0;
791
792 /* Source address length, encoded in bits */
793 addr_length = GET_U_1(pptr);
794 pptr++;
795
796 /* Source address */
797 ND_TCHECK_LEN(pptr, (addr_length >> 3));
798 total_length += (addr_length >> 3) + 1;
799 offset = (u_int)strlen(buf);
800 if (addr_length) {
801 snprintf(buf + offset, buflen - offset, ", Source %s",
802 bgp_vpn_ip_print(ndo, pptr, addr_length));
803 pptr += (addr_length >> 3);
804 }
805
806 /* Group address length, encoded in bits */
807 addr_length = GET_U_1(pptr);
808 pptr++;
809
810 /* Group address */
811 ND_TCHECK_LEN(pptr, (addr_length >> 3));
812 total_length += (addr_length >> 3) + 1;
813 offset = (u_int)strlen(buf);
814 if (addr_length) {
815 snprintf(buf + offset, buflen - offset, ", Group %s",
816 bgp_vpn_ip_print(ndo, pptr, addr_length));
817 pptr += (addr_length >> 3);
818 }
819
820 trunc:
821 return (total_length);
822 }
823
824 /* Print an RFC 4364 Route Distinguisher */
825 const char *
826 bgp_vpn_rd_print(netdissect_options *ndo,
827 const u_char *pptr)
828 {
829 /* allocate space for the largest possible string */
830 static char rd[sizeof("xxxxx.xxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
831 char *pos = rd;
832 /* allocate space for the largest possible string */
833 char astostr[AS_STR_SIZE];
834
835 /* ok lets load the RD format */
836 switch (GET_BE_U_2(pptr)) {
837
838 case 0:
839 /* 2-byte-AS:number fmt */
840 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
841 GET_BE_U_2(pptr + 2),
842 GET_BE_U_4(pptr + 4),
843 GET_U_1(pptr + 4), GET_U_1(pptr + 5),
844 GET_U_1(pptr + 6), GET_U_1(pptr + 7));
845 break;
846
847 case 1:
848 /* IP-address:AS fmt */
849 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
850 GET_U_1(pptr + 2), GET_U_1(pptr + 3),
851 GET_U_1(pptr + 4), GET_U_1(pptr + 5),
852 GET_BE_U_2(pptr + 6));
853 break;
854
855 case 2:
856 /* 4-byte-AS:number fmt */
857 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
858 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 2)),
859 GET_BE_U_2(pptr + 6), GET_U_1(pptr + 2),
860 GET_U_1(pptr + 3), GET_U_1(pptr + 4),
861 GET_U_1(pptr + 5), GET_BE_U_2(pptr + 6));
862 break;
863 default:
864 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
865 break;
866 }
867 pos += strlen(pos);
868 *(pos) = '\0';
869 return (rd);
870 }
871
872 /*
873 * Print an RFC 4360 Extended Community.
874 */
875 static void
876 bgp_extended_community_print(netdissect_options *ndo,
877 const u_char *pptr)
878 {
879 union { /* copy buffer for bandwidth values */
880 float f;
881 uint32_t i;
882 } bw;
883 /* allocate space for the largest possible string */
884 char astostr[AS_STR_SIZE];
885
886 switch (GET_BE_U_2(pptr)) {
887
888 case BGP_EXT_COM_RT_0:
889 case BGP_EXT_COM_RO_0:
890 case BGP_EXT_COM_L2VPN_RT_0:
891 ND_PRINT("%u:%u (= %s)",
892 GET_BE_U_2(pptr + 2),
893 GET_BE_U_4(pptr + 4),
894 GET_IPADDR_STRING(pptr+4));
895 break;
896
897 case BGP_EXT_COM_RT_1:
898 case BGP_EXT_COM_RO_1:
899 case BGP_EXT_COM_L2VPN_RT_1:
900 case BGP_EXT_COM_VRF_RT_IMP:
901 ND_PRINT("%s:%u",
902 GET_IPADDR_STRING(pptr+2),
903 GET_BE_U_2(pptr + 6));
904 break;
905
906 case BGP_EXT_COM_RT_2:
907 case BGP_EXT_COM_RO_2:
908 ND_PRINT("%s:%u",
909 as_printf(ndo, astostr, sizeof(astostr),
910 GET_BE_U_4(pptr + 2)), GET_BE_U_2(pptr + 6));
911 break;
912
913 case BGP_EXT_COM_LINKBAND:
914 bw.i = GET_BE_U_4(pptr + 4);
915 ND_PRINT("bandwidth: %.3f Mbps",
916 bw.f*8/1000000);
917 break;
918
919 case BGP_EXT_COM_OVS:
920 /* The Reserved field MUST be set to 0 and ignored upon the
921 * receipt of this community.
922 */
923 {
924 uint64_t reserved = GET_BE_U_5(pptr + 2);
925
926 if (reserved)
927 ND_PRINT("[the reserved field 0x%" PRIx64 " MUST be 0] ",
928 reserved);
929 ND_PRINT("ovs: %s",
930 tok2str(bgp_prefix_origin_validation_state,
931 "unknown origin validation state",
932 GET_U_1(pptr + 7)));
933 }
934 break;
935
936 case BGP_EXT_COM_VPN_ORIGIN:
937 case BGP_EXT_COM_VPN_ORIGIN2:
938 case BGP_EXT_COM_VPN_ORIGIN3:
939 case BGP_EXT_COM_VPN_ORIGIN4:
940 case BGP_EXT_COM_OSPF_RID:
941 case BGP_EXT_COM_OSPF_RID2:
942 ND_PRINT("%s", GET_IPADDR_STRING(pptr+2));
943 break;
944
945 case BGP_EXT_COM_OSPF_RTYPE:
946 case BGP_EXT_COM_OSPF_RTYPE2:
947 ND_PRINT("area:%s, router-type:%s, metric-type:%s%s",
948 GET_IPADDR_STRING(pptr+2),
949 tok2str(bgp_extd_comm_ospf_rtype_values,
950 "unknown (0x%02x)",
951 GET_U_1((pptr + 6))),
952 (GET_U_1(pptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
953 ((GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_EXT) || (GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "");
954 break;
955
956 case BGP_EXT_COM_L2INFO:
957 ND_PRINT("%s Control Flags [0x%02x]:MTU %u",
958 tok2str(l2vpn_encaps_values,
959 "unknown encaps",
960 GET_U_1((pptr + 2))),
961 GET_U_1((pptr + 3)),
962 GET_BE_U_2(pptr + 4));
963 break;
964
965 case BGP_EXT_COM_SOURCE_AS:
966 ND_PRINT("AS %u", GET_BE_U_2(pptr + 2));
967 break;
968
969 case BGP_EXT_COM_ENCAP:
970 ND_PRINT("Tunnel type: %s", tok2str(bgp_extd_comm_encap_tunnel_values,
971 "unknown encaps",
972 GET_BE_U_2(pptr + 6)));
973 break;
974
975 default:
976 ND_PRINT("%02x%02x%02x%02x%02x%02x",
977 GET_U_1(pptr + 2),
978 GET_U_1(pptr + 3),
979 GET_U_1(pptr + 4),
980 GET_U_1(pptr + 5),
981 GET_U_1(pptr + 6),
982 GET_U_1(pptr + 7));
983 break;
984 }
985 }
986
987 /*
988 * RFC4684 (Section 4)/RFC2858 (Section 4).
989 * RTC membership prefix is structured as follows
990 * [prefix-len] [origin-as] [route-target]
991 * The route-target is encoded as RT ext-comms.
992 * Prefix-len may be 0, 32..96
993 *
994 * Note that pptr is not packet data - it is
995 * a buffer owned by our caller - therefore GET_*
996 * macros can not be used.
997 */
998 static char *
999 bgp_rt_prefix_print(netdissect_options *ndo,
1000 const u_char *pptr,
1001 u_int plen)
1002 {
1003 /* allocate space for the largest possible string */
1004 char rtc_prefix_in_hex[sizeof("0000 0000 0000 0000")] = "";
1005 u_int rtc_prefix_in_hex_len = 0;
1006 static char output[61]; /* max response string */
1007 /* allocate space for the largest possible string */
1008 char astostr[AS_STR_SIZE];
1009 uint16_t ec_type = 0;
1010 u_int octet_count;
1011 u_int i;
1012
1013 if (plen == 0) {
1014 snprintf(output, sizeof(output), "route-target: 0:0/0");
1015 return (output);
1016 }
1017
1018 /* hex representation of the prefix */
1019 octet_count = (plen+7)/8;
1020 for (i=0; i<octet_count; i++) {
1021 rtc_prefix_in_hex_len += snprintf(rtc_prefix_in_hex+rtc_prefix_in_hex_len,
1022 sizeof(rtc_prefix_in_hex)-rtc_prefix_in_hex_len,
1023 "%02x%s", *(pptr+i),
1024 ((i%2 == 1) && (i<octet_count-1)) ? " " : "");
1025 }
1026
1027 if (plen < 16) {
1028 /*
1029 * The prefix is too short to include the full ext-comm type,
1030 * so we have no way to parse it further.
1031 */
1032 snprintf(output, sizeof(output), "route-target: partial-type: (%s/%d)",
1033 rtc_prefix_in_hex, plen);
1034 return (output);
1035 }
1036
1037 /*
1038 * get the ext-comm type
1039 * Note: pptr references a static 8 octet buffer with unused bits set to 0,
1040 * hence EXTRACT_*() macros are safe.
1041 */
1042 ec_type = EXTRACT_BE_U_2(pptr);
1043 switch (ec_type) {
1044 case BGP_EXT_COM_RT_0:
1045 /* 2-byte-AS:number fmt */
1046 snprintf(output, sizeof(output), "route-target: %u:%u/%d (%s)",
1047 EXTRACT_BE_U_2(pptr+2),
1048 EXTRACT_BE_U_4(pptr+4),
1049 plen, rtc_prefix_in_hex);
1050 break;
1051
1052 case BGP_EXT_COM_RT_1:
1053 /* IP-address:AS fmt */
1054 snprintf(output, sizeof(output), "route-target: %u.%u.%u.%u:%u/%d (%s)",
1055 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5),
1056 EXTRACT_BE_U_2(pptr+6), plen, rtc_prefix_in_hex);
1057 break;
1058
1059 case BGP_EXT_COM_RT_2:
1060 /* 4-byte-AS:number fmt */
1061 snprintf(output, sizeof(output), "route-target: %s:%u/%d (%s)",
1062 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(pptr+2)),
1063 EXTRACT_BE_U_2(pptr+6), plen, rtc_prefix_in_hex);
1064 break;
1065
1066 default:
1067 snprintf(output, sizeof(output), "route target: unknown-type(%04x) (%s/%d)",
1068 ec_type,
1069 rtc_prefix_in_hex, plen);
1070 break;
1071 }
1072 return (output);
1073 }
1074
1075 /* RFC 4684 */
1076 static int
1077 decode_rt_routing_info(netdissect_options *ndo,
1078 const u_char *pptr)
1079 {
1080 uint8_t route_target[8];
1081 u_int plen;
1082 /* allocate space for the largest possible string */
1083 char astostr[AS_STR_SIZE];
1084 u_int num_octets;
1085
1086 /* NLRI "prefix length" from RFC 2858 Section 4. */
1087 plen = GET_U_1(pptr); /* get prefix length */
1088
1089 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
1090 * RFC 4684 Section 4 defines the layout of "origin AS" and "route
1091 * target" fields inside the "prefix" depending on its length.
1092 */
1093 if (0 == plen) {
1094 /* Without "origin AS", without "route target". */
1095 ND_PRINT("\n\t default route target");
1096 return 1;
1097 }
1098
1099 if (32 > plen) {
1100 ND_PRINT("\n\t (illegal prefix length)");
1101 return -1;
1102 }
1103
1104 /* With at least "origin AS", possibly with "route target". */
1105 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 1));
1106
1107 plen -= 32; /* adjust prefix length */
1108
1109 if (64 < plen) {
1110 ND_PRINT("\n\t (illegal prefix length)");
1111 return -1;
1112 }
1113
1114 /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 }
1115 * and gives the number of octets in the variable-length "route
1116 * target" field inside this NLRI "prefix". Look for it.
1117 */
1118 memset(&route_target, 0, sizeof(route_target));
1119 num_octets = (plen + 7) / 8;
1120 GET_CPY_BYTES(&route_target, pptr + 5, num_octets);
1121 /* If mask-len is not on octet boundary, ensure all extra bits are 0 */
1122 if (plen % 8) {
1123 ((u_char *)&route_target)[num_octets - 1] &=
1124 ((0xff00 >> (plen % 8)) & 0xff);
1125 }
1126 ND_PRINT("\n\t origin AS: %s, %s",
1127 astostr,
1128 bgp_rt_prefix_print(ndo, (u_char *)&route_target, plen));
1129
1130 return 5 + num_octets;
1131 }
1132
1133 static int
1134 decode_labeled_vpn_prefix4(netdissect_options *ndo,
1135 const u_char *pptr, char *buf, size_t buflen)
1136 {
1137 nd_ipv4 addr;
1138 u_int plen;
1139
1140 plen = GET_U_1(pptr); /* get prefix length */
1141
1142 if ((24+64) > plen)
1143 return -1;
1144
1145 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1146
1147 if (32 < plen)
1148 return -1;
1149
1150 memset(&addr, 0, sizeof(addr));
1151 GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
1152 if (plen % 8) {
1153 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
1154 ((0xff00 >> (plen % 8)) & 0xff);
1155 }
1156 /* the label may get offsetted by 4 bits so lets shift it right */
1157 snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1158 bgp_vpn_rd_print(ndo, pptr+4),
1159 ipaddr_string(ndo, (const u_char *)&addr),
1160 plen,
1161 GET_BE_U_3(pptr + 1)>>4,
1162 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1163
1164 return 12 + (plen + 7) / 8;
1165 }
1166
1167 /*
1168 * +-------------------------------+
1169 * | |
1170 * | RD:IPv4-address (12 octets) |
1171 * | |
1172 * +-------------------------------+
1173 * | MDT Group-address (4 octets) |
1174 * +-------------------------------+
1175 */
1176
1177 #define MDT_VPN_NLRI_LEN 16
1178
1179 static int
1180 decode_mdt_vpn_nlri(netdissect_options *ndo,
1181 const u_char *pptr, char *buf, size_t buflen)
1182 {
1183 const u_char *rd;
1184 const u_char *vpn_ip;
1185
1186 /* if the NLRI is not predefined length, quit.*/
1187 if (GET_U_1(pptr) != MDT_VPN_NLRI_LEN * 8)
1188 return -1;
1189 pptr++;
1190
1191 /* RD */
1192 ND_TCHECK_8(pptr);
1193 rd = pptr;
1194 pptr += 8;
1195
1196 /* IPv4 address */
1197 vpn_ip = pptr;
1198 pptr += sizeof(nd_ipv4);
1199
1200 /* MDT Group Address */
1201 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
1202 bgp_vpn_rd_print(ndo, rd), GET_IPADDR_STRING(vpn_ip), GET_IPADDR_STRING(pptr));
1203
1204 return MDT_VPN_NLRI_LEN + 1;
1205
1206 trunc:
1207 return -2;
1208 }
1209
1210 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
1211 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
1212 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
1213 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
1214 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
1215 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
1216 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
1217
1218 static const struct tok bgp_multicast_vpn_route_type_values[] = {
1219 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
1220 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
1221 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
1222 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
1223 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
1224 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
1225 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
1226 { 0, NULL}
1227 };
1228
1229 static int
1230 decode_multicast_vpn(netdissect_options *ndo,
1231 const u_char *pptr, char *buf, size_t buflen)
1232 {
1233 /* allocate space for the largest possible string */
1234 char astostr[AS_STR_SIZE];
1235 uint8_t route_type, route_length;
1236 u_int addr_length, sg_length;
1237 u_int offset;
1238
1239 route_type = GET_U_1(pptr);
1240 pptr++;
1241 route_length = GET_U_1(pptr);
1242 pptr++;
1243
1244 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
1245 tok2str(bgp_multicast_vpn_route_type_values,
1246 "Unknown", route_type),
1247 route_type, route_length);
1248
1249 switch(route_type) {
1250 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
1251 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1252 offset = (u_int)strlen(buf);
1253 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
1254 bgp_vpn_rd_print(ndo, pptr),
1255 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
1256 (route_length - BGP_VPN_RD_LEN) << 3));
1257 break;
1258 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
1259 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1260 offset = (u_int)strlen(buf);
1261 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
1262 bgp_vpn_rd_print(ndo, pptr),
1263 as_printf(ndo, astostr, sizeof(astostr),
1264 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1265 break;
1266
1267 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
1268 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1269 offset = (u_int)strlen(buf);
1270 snprintf(buf + offset, buflen - offset, ", RD: %s",
1271 bgp_vpn_rd_print(ndo, pptr));
1272 pptr += BGP_VPN_RD_LEN;
1273
1274 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1275 addr_length = route_length - sg_length;
1276
1277 ND_TCHECK_LEN(pptr, addr_length);
1278 offset = (u_int)strlen(buf);
1279 snprintf(buf + offset, buflen - offset, ", Originator %s",
1280 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
1281 break;
1282
1283 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
1284 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1285 offset = (u_int)strlen(buf);
1286 snprintf(buf + offset, buflen - offset, ", RD: %s",
1287 bgp_vpn_rd_print(ndo, pptr));
1288 pptr += BGP_VPN_RD_LEN;
1289
1290 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1291 break;
1292
1293 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
1294 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
1295 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1296 offset = (u_int)strlen(buf);
1297 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
1298 bgp_vpn_rd_print(ndo, pptr),
1299 as_printf(ndo, astostr, sizeof(astostr),
1300 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1301 pptr += BGP_VPN_RD_LEN + 4;
1302
1303 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1304 break;
1305
1306 /*
1307 * no per route-type printing yet.
1308 */
1309 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
1310 default:
1311 break;
1312 }
1313
1314 return route_length + 2;
1315
1316 trunc:
1317 return -2;
1318 }
1319
1320 /*
1321 * As I remember, some versions of systems have an snprintf() that
1322 * returns -1 if the buffer would have overflowed. If the return
1323 * value is negative, set buflen to 0, to indicate that we've filled
1324 * the buffer up.
1325 *
1326 * If the return value is greater than buflen, that means that
1327 * the buffer would have overflowed; again, set buflen to 0 in
1328 * that case.
1329 */
1330 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1331 if (stringlen<0) \
1332 buflen=0; \
1333 else if ((u_int)stringlen>buflen) \
1334 buflen=0; \
1335 else { \
1336 buflen-=stringlen; \
1337 buf+=stringlen; \
1338 }
1339
1340 static int
1341 decode_labeled_vpn_l2(netdissect_options *ndo,
1342 const u_char *pptr, char *buf, size_t buflen)
1343 {
1344 u_int plen, tlen, tlv_type, tlv_len, ttlv_len;
1345 int stringlen;
1346
1347 plen = GET_BE_U_2(pptr);
1348 tlen = plen;
1349 pptr += 2;
1350 /* Old and new L2VPN NLRI share AFI/SAFI
1351 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1352 * and > 17 as old format. Complain for the middle case
1353 */
1354 if (plen == 12) {
1355 /* assume AD-only with RD, BGPNH */
1356 ND_TCHECK_LEN(pptr, 12);
1357 buf[0] = '\0';
1358 stringlen = snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1359 bgp_vpn_rd_print(ndo, pptr),
1360 GET_IPADDR_STRING(pptr+8));
1361 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1362 pptr += 12;
1363 tlen -= 12;
1364 return plen + 2;
1365 } else if (plen > 17) {
1366 /* assume old format */
1367 /* RD, ID, LBLKOFF, LBLBASE */
1368
1369 ND_TCHECK_LEN(pptr, 15);
1370 buf[0] = '\0';
1371 stringlen = snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1372 bgp_vpn_rd_print(ndo, pptr),
1373 GET_BE_U_2(pptr + 8),
1374 GET_BE_U_2(pptr + 10),
1375 GET_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1376 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1377 pptr += 15;
1378 tlen -= 15;
1379
1380 /* ok now the variable part - lets read out TLVs*/
1381 while (tlen != 0) {
1382 if (tlen < 3) {
1383 if (buflen != 0) {
1384 stringlen=snprintf(buf,buflen, "\n\t\tran past the end");
1385 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1386 }
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 if (buflen != 0) {
1398 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1399 tlv_type,
1400 tlv_len);
1401 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1402 }
1403 while (ttlv_len != 0) {
1404 if (tlen < 1) {
1405 if (buflen != 0) {
1406 stringlen=snprintf(buf,buflen, " (ran past the end)");
1407 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1408 }
1409 return plen + 2;
1410 }
1411 ND_TCHECK_1(pptr);
1412 if (buflen != 0) {
1413 stringlen=snprintf(buf,buflen, "%02x",
1414 GET_U_1(pptr));
1415 pptr++;
1416 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1417 }
1418 ttlv_len--;
1419 tlen--;
1420 }
1421 break;
1422 default:
1423 if (buflen != 0) {
1424 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1425 tlv_type,
1426 tlv_len);
1427 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1428 }
1429 if (tlen < ttlv_len) {
1430 if (buflen != 0) {
1431 stringlen=snprintf(buf,buflen, " (ran past the end)");
1432 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1433 }
1434 return plen + 2;
1435 }
1436 tlen -= ttlv_len;
1437 break;
1438 }
1439 }
1440 return plen + 2;
1441 } else {
1442 /* complain bitterly ? */
1443 /* fall through */
1444 goto trunc;
1445 }
1446
1447 trunc:
1448 return -2;
1449 }
1450
1451 int
1452 decode_prefix6(netdissect_options *ndo,
1453 const u_char *pd, u_int itemlen, char *buf, size_t buflen)
1454 {
1455 nd_ipv6 addr;
1456 u_int plen, plenbytes;
1457
1458 ITEMCHECK(1);
1459 plen = GET_U_1(pd);
1460 if (128 < plen)
1461 return -1;
1462 itemlen -= 1;
1463
1464 memset(&addr, 0, sizeof(addr));
1465 plenbytes = (plen + 7) / 8;
1466 ITEMCHECK(plenbytes);
1467 GET_CPY_BYTES(&addr, pd + 1, plenbytes);
1468 if (plen % 8) {
1469 addr[plenbytes - 1] &=
1470 ((0xff00 >> (plen % 8)) & 0xff);
1471 }
1472 snprintf(buf, buflen, "%s/%u", ip6addr_string(ndo, (const u_char *)&addr), plen);
1473 return 1 + plenbytes;
1474
1475 badtlv:
1476 return -2;
1477 }
1478
1479 static int
1480 decode_labeled_prefix6(netdissect_options *ndo,
1481 const u_char *pptr, u_int itemlen, char *buf, size_t buflen)
1482 {
1483 nd_ipv6 addr;
1484 u_int plen, plenbytes;
1485
1486 /* prefix length and label = 4 bytes */
1487 ND_TCHECK_4(pptr);
1488 ITEMCHECK(4);
1489 plen = GET_U_1(pptr); /* get prefix length */
1490
1491 if (24 > plen)
1492 return -1;
1493
1494 plen -= 24; /* adjust prefixlen - labellength */
1495
1496 if (128 < plen)
1497 return -1;
1498 itemlen -= 4;
1499
1500 memset(&addr, 0, sizeof(addr));
1501 plenbytes = (plen + 7) / 8;
1502 GET_CPY_BYTES(&addr, pptr + 4, plenbytes);
1503 if (plen % 8) {
1504 addr[plenbytes - 1] &=
1505 ((0xff00 >> (plen % 8)) & 0xff);
1506 }
1507 /* the label may get offsetted by 4 bits so lets shift it right */
1508 snprintf(buf, buflen, "%s/%u, label:%u %s",
1509 ip6addr_string(ndo, (const u_char *)&addr),
1510 plen,
1511 GET_BE_U_3(pptr + 1)>>4,
1512 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1513
1514 return 4 + plenbytes;
1515
1516 trunc:
1517 return -2;
1518
1519 badtlv:
1520 return -3;
1521 }
1522
1523 static int
1524 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1525 const u_char *pptr, char *buf, size_t buflen)
1526 {
1527 nd_ipv6 addr;
1528 u_int plen;
1529
1530 plen = GET_U_1(pptr); /* get prefix length */
1531
1532 if ((24+64) > plen)
1533 return -1;
1534
1535 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1536
1537 if (128 < plen)
1538 return -1;
1539
1540 memset(&addr, 0, sizeof(addr));
1541 GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
1542 if (plen % 8) {
1543 addr[(plen + 7) / 8 - 1] &=
1544 ((0xff00 >> (plen % 8)) & 0xff);
1545 }
1546 /* the label may get offsetted by 4 bits so lets shift it right */
1547 snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1548 bgp_vpn_rd_print(ndo, pptr+4),
1549 ip6addr_string(ndo, (const u_char *)&addr),
1550 plen,
1551 GET_BE_U_3(pptr + 1)>>4,
1552 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1553
1554 return 12 + (plen + 7) / 8;
1555 }
1556
1557 static int
1558 decode_clnp_prefix(netdissect_options *ndo,
1559 const u_char *pptr, char *buf, size_t buflen)
1560 {
1561 uint8_t addr[19];
1562 u_int plen;
1563
1564 plen = GET_U_1(pptr); /* get prefix length */
1565
1566 if (152 < plen)
1567 return -1;
1568
1569 memset(&addr, 0, sizeof(addr));
1570 GET_CPY_BYTES(&addr, pptr + 4, (plen + 7) / 8);
1571 if (plen % 8) {
1572 addr[(plen + 7) / 8 - 1] &=
1573 ((0xff00 >> (plen % 8)) & 0xff);
1574 }
1575 /* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */
1576 snprintf(buf, buflen, "%s/%u",
1577 isonsap_string(ndo, addr,(plen + 7) / 8),
1578 plen);
1579
1580 return 1 + (plen + 7) / 8;
1581 }
1582
1583 static int
1584 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1585 const u_char *pptr, char *buf, size_t buflen)
1586 {
1587 uint8_t addr[19];
1588 u_int plen;
1589
1590 plen = GET_U_1(pptr); /* get prefix length */
1591
1592 if ((24+64) > plen)
1593 return -1;
1594
1595 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1596
1597 if (152 < plen)
1598 return -1;
1599
1600 memset(&addr, 0, sizeof(addr));
1601 GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
1602 if (plen % 8) {
1603 addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
1604 }
1605 /* the label may get offsetted by 4 bits so lets shift it right */
1606 /* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */
1607 snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1608 bgp_vpn_rd_print(ndo, pptr+4),
1609 isonsap_string(ndo, addr,(plen + 7) / 8),
1610 plen,
1611 GET_BE_U_3(pptr + 1)>>4,
1612 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1613
1614 return 12 + (plen + 7) / 8;
1615 }
1616
1617 /*
1618 * bgp_attr_get_as_size
1619 *
1620 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1621 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1622 * support, exchange AS-Path with the same path-attribute type value 0x02.
1623 */
1624 static u_int
1625 bgp_attr_get_as_size(netdissect_options *ndo,
1626 uint8_t bgpa_type, const u_char *pptr, u_int len)
1627 {
1628 const u_char *tptr = pptr;
1629
1630 /*
1631 * If the path attribute is the optional AS4 path type, then we already
1632 * know, that ASs must be encoded in 4 byte format.
1633 */
1634 if (bgpa_type == BGPTYPE_AS4_PATH) {
1635 return 4;
1636 }
1637
1638 /*
1639 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1640 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1641 * each.
1642 */
1643 while (tptr < pptr + len) {
1644 /*
1645 * If we do not find a valid segment type, our guess might be wrong.
1646 */
1647 if (GET_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || GET_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
1648 goto trunc;
1649 }
1650 tptr += 2 + GET_U_1(tptr + 1) * 2;
1651 }
1652
1653 /*
1654 * If we correctly reached end of the AS path attribute data content,
1655 * then most likely ASs were indeed encoded as 2 bytes.
1656 */
1657 if (tptr == pptr + len) {
1658 return 2;
1659 }
1660
1661 trunc:
1662
1663 /*
1664 * We can come here, either we did not have enough data, or if we
1665 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1666 * so that calller can try to decode each AS as of 4 bytes. If indeed
1667 * there was not enough data, it will crib and end the parse anyways.
1668 */
1669 return 4;
1670 }
1671
1672 /*
1673 * The only way to know that a BGP UPDATE message is using add path is
1674 * by checking if the capability is in the OPEN message which we may have missed.
1675 * So this function checks if it is possible that the update could contain add path
1676 * and if so it checks that standard BGP doesn't make sense.
1677 */
1678 static int
1679 check_add_path(netdissect_options *ndo, const u_char *pptr, u_int length,
1680 u_int max_prefix_length)
1681 {
1682 u_int offset, prefix_length;
1683
1684 if (length < 5) {
1685 return 0;
1686 }
1687
1688 /*
1689 * Scan through the NLRI information under the assumpetion that
1690 * it doesn't have path IDs.
1691 */
1692 for (offset = 0; offset < length;) {
1693 offset += 4;
1694 if (!ND_TTEST_1(pptr + offset)) {
1695 /* We ran out of captured data; quit scanning. */
1696 break;
1697 }
1698 prefix_length = GET_U_1(pptr + offset);
1699 /*
1700 * Add 4 to cover the path id
1701 * and check the prefix length isn't greater than 32/128.
1702 */
1703 if (prefix_length > max_prefix_length) {
1704 return 0;
1705 }
1706 /* Add 1 for the prefix_length byte and prefix_length to cover the address */
1707 offset += 1 + ((prefix_length + 7) / 8);
1708 }
1709 /* check we haven't gone past the end of the section */
1710 if (offset > length) {
1711 return 0;
1712 }
1713
1714 /* check it's not standard BGP */
1715 for (offset = 0; offset < length; ) {
1716 if (!ND_TTEST_1(pptr + offset)) {
1717 /* We ran out of captured data; quit scanning. */
1718 break;
1719 }
1720 prefix_length = GET_U_1(pptr + offset);
1721 /*
1722 * If the prefix_length is zero (0.0.0.0/0)
1723 * and since it's not the only address (length >= 5)
1724 * then it is add-path
1725 */
1726 if (prefix_length < 1 || prefix_length > max_prefix_length) {
1727 return 1;
1728 }
1729 offset += 1 + ((prefix_length + 7) / 8);
1730 }
1731 if (offset > length) {
1732 return 1;
1733 }
1734
1735 /* assume not add-path by default */
1736 return 0;
1737 }
1738
1739 static int
1740 bgp_mp_af_print(netdissect_options *ndo,
1741 const u_char *tptr, u_int tlen,
1742 uint16_t *afp, uint8_t *safip)
1743 {
1744 uint16_t af;
1745 uint8_t safi;
1746
1747 af = GET_BE_U_2(tptr);
1748 *afp = af;
1749 safi = GET_U_1(tptr + 2);
1750 *safip = safi;
1751
1752 ND_PRINT("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1753 tok2str(af_values, "Unknown AFI", af),
1754 af,
1755 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1756 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1757 safi);
1758
1759 switch(af<<8 | safi) {
1760 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1761 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1762 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1763 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1764 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1765 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1766 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1767 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1768 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1769 case (AFNUM_INET<<8 | SAFNUM_MDT):
1770 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1771 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1772 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1773 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1774 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1775 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1776 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1777 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1778 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1779 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1780 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1781 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1782 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1783 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1784 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1785 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1786 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1787 break;
1788 default:
1789 ND_TCHECK_LEN(tptr, tlen);
1790 ND_PRINT("\n\t no AFI %u / SAFI %u decoder", af, safi);
1791 if (ndo->ndo_vflag <= 1)
1792 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1793 return -1;
1794 }
1795 return 0;
1796 trunc:
1797 return -2;
1798 }
1799
1800 static int
1801 bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi,
1802 const u_char *tptr, u_int len,
1803 char *buf, size_t buflen,
1804 int add_path4, int add_path6)
1805 {
1806 int advance;
1807 u_int path_id = 0;
1808
1809 switch (af<<8 | safi) {
1810 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1811 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1812 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1813 if (add_path4) {
1814 path_id = GET_BE_U_4(tptr);
1815 tptr += 4;
1816 }
1817 advance = decode_prefix4(ndo, tptr, len, buf, buflen);
1818 if (advance == -1)
1819 ND_PRINT("\n\t (illegal prefix length)");
1820 else if (advance == -2)
1821 break; /* bytes left, but not enough */
1822 else
1823 ND_PRINT("\n\t %s", buf);
1824 if (add_path4) {
1825 ND_PRINT(" Path Id: %u", path_id);
1826 advance += 4;
1827 }
1828 break;
1829 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1830 advance = decode_labeled_prefix4(ndo, tptr, len, buf, buflen);
1831 if (advance == -1)
1832 ND_PRINT("\n\t (illegal prefix length)");
1833 else if (advance == -2)
1834 goto trunc;
1835 else if (advance == -3)
1836 break; /* bytes left, but not enough */
1837 else
1838 ND_PRINT("\n\t %s", buf);
1839 break;
1840 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1841 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1842 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1843 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, buflen);
1844 if (advance == -1)
1845 ND_PRINT("\n\t (illegal prefix length)");
1846 else
1847 ND_PRINT("\n\t %s", buf);
1848 break;
1849 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1850 advance = decode_rt_routing_info(ndo, tptr);
1851 break;
1852 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1853 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1854 advance = decode_multicast_vpn(ndo, tptr, buf, buflen);
1855 if (advance == -1)
1856 ND_PRINT("\n\t (illegal prefix length)");
1857 else if (advance == -2)
1858 goto trunc;
1859 else
1860 ND_PRINT("\n\t %s", buf);
1861 break;
1862
1863 case (AFNUM_INET<<8 | SAFNUM_MDT):
1864 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, buflen);
1865 if (advance == -1)
1866 ND_PRINT("\n\t (illegal prefix length)");
1867 else if (advance == -2)
1868 goto trunc;
1869 else
1870 ND_PRINT("\n\t %s", buf);
1871 break;
1872 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1873 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1874 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1875 if (add_path6) {
1876 path_id = GET_BE_U_4(tptr);
1877 tptr += 4;
1878 }
1879 advance = decode_prefix6(ndo, tptr, len, buf, buflen);
1880 if (advance == -1)
1881 ND_PRINT("\n\t (illegal prefix length)");
1882 else if (advance == -2)
1883 break; /* bytes left, but not enough */
1884 else
1885 ND_PRINT("\n\t %s", buf);
1886 if (add_path6) {
1887 ND_PRINT(" Path Id: %u", path_id);
1888 advance += 4;
1889 }
1890 break;
1891 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1892 advance = decode_labeled_prefix6(ndo, tptr, len, buf, buflen);
1893 if (advance == -1)
1894 ND_PRINT("\n\t (illegal prefix length)");
1895 else if (advance == -2)
1896 goto trunc;
1897 else if (advance == -3)
1898 break; /* bytes left, but not enough */
1899 else
1900 ND_PRINT("\n\t %s", buf);
1901 break;
1902 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1903 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1904 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1905 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, buflen);
1906 if (advance == -1)
1907 ND_PRINT("\n\t (illegal prefix length)");
1908 else
1909 ND_PRINT("\n\t %s", buf);
1910 break;
1911 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1912 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1913 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1914 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1915 advance = decode_labeled_vpn_l2(ndo, tptr, buf, buflen);
1916 if (advance == -1)
1917 ND_PRINT("\n\t (illegal length)");
1918 else if (advance == -2)
1919 goto trunc;
1920 else
1921 ND_PRINT("\n\t %s", buf);
1922 break;
1923 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1924 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1925 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1926 advance = decode_clnp_prefix(ndo, tptr, buf, buflen);
1927 if (advance == -1)
1928 ND_PRINT("\n\t (illegal prefix length)");
1929 else
1930 ND_PRINT("\n\t %s", buf);
1931 break;
1932 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1933 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1934 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1935 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, buflen);
1936 if (advance == -1)
1937 ND_PRINT("\n\t (illegal prefix length)");
1938 else
1939 ND_PRINT("\n\t %s", buf);
1940 break;
1941 default:
1942 /*
1943 * This should not happen, we should have been protected
1944 * by bgp_mp_af_print()'s return value.
1945 */
1946 ND_PRINT("\n\t ERROR: no AFI %u / SAFI %u decoder", af, safi);
1947 advance = -4;
1948 break;
1949 }
1950 return advance;
1951 trunc: /* we rely on the caller to recognize -2 return value */
1952 return -2;
1953 }
1954
1955 static const struct tok bgp_flags[] = {
1956 { 0x80, "O"},
1957 { 0x40, "T"},
1958 { 0x20, "P"},
1959 { 0x10, "E"},
1960 { 0, NULL }
1961 };
1962
1963 static int
1964 bgp_attr_print(netdissect_options *ndo,
1965 uint8_t atype, const u_char *pptr, u_int len,
1966 const unsigned attr_set_level)
1967 {
1968 /* allocate space for the largest possible string */
1969 char astostr[AS_STR_SIZE];
1970 u_int i;
1971 uint16_t af;
1972 uint8_t safi, snpa, nhlen;
1973 int advance;
1974 u_int tlen;
1975 const u_char *tptr;
1976 char buf[MAXHOSTNAMELEN + 100];
1977 u_int as_size;
1978 int add_path4, add_path6;
1979 int ret;
1980
1981 tptr = pptr;
1982 tlen = len;
1983
1984 switch (atype) {
1985 case BGPTYPE_ORIGIN:
1986 if (len != 1)
1987 ND_PRINT("invalid len");
1988 else {
1989 ND_PRINT("%s", tok2str(bgp_origin_values,
1990 "Unknown Origin Typecode",
1991 GET_U_1(tptr)));
1992 }
1993 break;
1994
1995 /*
1996 * Process AS4 byte path and AS2 byte path attributes here.
1997 */
1998 case BGPTYPE_AS4_PATH:
1999 case BGPTYPE_AS_PATH:
2000 if (len % 2) {
2001 ND_PRINT("invalid len");
2002 break;
2003 }
2004 if (!len) {
2005 ND_PRINT("empty");
2006 break;
2007 }
2008
2009 /*
2010 * BGP updates exchanged between New speakers that support 4
2011 * byte AS, ASs are always encoded in 4 bytes. There is no
2012 * definitive way to find this, just by the packet's
2013 * contents. So, check for packet's TLV's sanity assuming
2014 * 2 bytes first, and it does not pass, assume that ASs are
2015 * encoded in 4 bytes format and move on.
2016 */
2017 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
2018
2019 while (tptr < pptr + len) {
2020 ND_PRINT("%s", tok2str(bgp_as_path_segment_open_values,
2021 "?", GET_U_1(tptr)));
2022 for (i = 0; i < GET_U_1(tptr + 1) * as_size; i += as_size) {
2023 ND_TCHECK_LEN(tptr + 2 + i, as_size);
2024 ND_PRINT("%s ",
2025 as_printf(ndo, astostr, sizeof(astostr),
2026 as_size == 2 ?
2027 GET_BE_U_2(tptr + i + 2) :
2028 GET_BE_U_4(tptr + i + 2)));
2029 }
2030 ND_PRINT("%s", tok2str(bgp_as_path_segment_close_values,
2031 "?", GET_U_1(tptr)));
2032 tptr += 2 + GET_U_1(tptr + 1) * as_size;
2033 }
2034 break;
2035 case BGPTYPE_NEXT_HOP:
2036 if (len != 4)
2037 ND_PRINT("invalid len");
2038 else {
2039 ND_PRINT("%s", GET_IPADDR_STRING(tptr));
2040 }
2041 break;
2042 case BGPTYPE_MULTI_EXIT_DISC:
2043 case BGPTYPE_LOCAL_PREF:
2044 if (len != 4)
2045 ND_PRINT("invalid len");
2046 else {
2047 ND_PRINT("%u", GET_BE_U_4(tptr));
2048 }
2049 break;
2050 case BGPTYPE_ATOMIC_AGGREGATE:
2051 if (len != 0)
2052 ND_PRINT("invalid len");
2053 break;
2054 case BGPTYPE_AGGREGATOR:
2055
2056 /*
2057 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
2058 * the length of this PA can be either 6 bytes or 8 bytes.
2059 */
2060 if (len != 6 && len != 8) {
2061 ND_PRINT("invalid len");
2062 break;
2063 }
2064 ND_TCHECK_LEN(tptr, len);
2065 if (len == 6) {
2066 ND_PRINT(" AS #%s, origin %s",
2067 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(tptr)),
2068 GET_IPADDR_STRING(tptr + 2));
2069 } else {
2070 ND_PRINT(" AS #%s, origin %s",
2071 as_printf(ndo, astostr, sizeof(astostr),
2072 GET_BE_U_4(tptr)), GET_IPADDR_STRING(tptr + 4));
2073 }
2074 break;
2075 case BGPTYPE_AGGREGATOR4:
2076 if (len != 8) {
2077 ND_PRINT("invalid len");
2078 break;
2079 }
2080 ND_PRINT(" AS #%s, origin %s",
2081 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)),
2082 GET_IPADDR_STRING(tptr + 4));
2083 break;
2084 case BGPTYPE_COMMUNITIES:
2085 if (len % 4) {
2086 ND_PRINT("invalid len");
2087 break;
2088 }
2089 while (tlen != 0) {
2090 uint32_t comm;
2091 ND_TCHECK_4(tptr);
2092 if (tlen < 4)
2093 goto trunc;
2094 comm = GET_BE_U_4(tptr);
2095 switch (comm) {
2096 case BGP_COMMUNITY_NO_EXPORT:
2097 ND_PRINT(" NO_EXPORT");
2098 break;
2099 case BGP_COMMUNITY_NO_ADVERT:
2100 ND_PRINT(" NO_ADVERTISE");
2101 break;
2102 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
2103 ND_PRINT(" NO_EXPORT_SUBCONFED");
2104 break;
2105 default:
2106 ND_PRINT("%u:%u%s",
2107 (comm >> 16) & 0xffff,
2108 comm & 0xffff,
2109 (tlen>4) ? ", " : "");
2110 break;
2111 }
2112 tlen -=4;
2113 tptr +=4;
2114 }
2115 break;
2116 case BGPTYPE_ORIGINATOR_ID:
2117 if (len != 4) {
2118 ND_PRINT("invalid len");
2119 break;
2120 }
2121 ND_PRINT("%s",GET_IPADDR_STRING(tptr));
2122 break;
2123 case BGPTYPE_CLUSTER_LIST:
2124 if (len % 4) {
2125 ND_PRINT("invalid len");
2126 break;
2127 }
2128 while (tlen != 0) {
2129 if (tlen < 4)
2130 goto trunc;
2131 ND_PRINT("%s%s",
2132 GET_IPADDR_STRING(tptr),
2133 (tlen>4) ? ", " : "");
2134 tlen -=4;
2135 tptr +=4;
2136 }
2137 break;
2138 case BGPTYPE_MP_REACH_NLRI:
2139 ND_TCHECK_3(tptr);
2140 if (tlen < 3)
2141 goto trunc;
2142 ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
2143 if (ret == -2)
2144 goto trunc;
2145 if (ret < 0)
2146 break;
2147
2148 tptr += 3;
2149 tlen -= 3;
2150
2151 ND_TCHECK_1(tptr);
2152 if (tlen < 1)
2153 goto trunc;
2154 nhlen = GET_U_1(tptr);
2155 tptr++;
2156 tlen--;
2157
2158 if (nhlen) {
2159 u_int nnh = 0;
2160 uint8_t tnhlen = nhlen;
2161 if (tlen < tnhlen)
2162 goto trunc;
2163 ND_PRINT("\n\t nexthop: ");
2164 while (tnhlen != 0) {
2165 if (nnh++ > 0) {
2166 ND_PRINT(", " );
2167 }
2168 switch(af<<8 | safi) {
2169 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
2170 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
2171 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
2172 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
2173 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
2174 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
2175 case (AFNUM_INET<<8 | SAFNUM_MDT):
2176 if (tnhlen < sizeof(nd_ipv4)) {
2177 ND_PRINT("invalid len");
2178 tptr += tnhlen;
2179 tlen -= tnhlen;
2180 tnhlen = 0;
2181 } else {
2182 ND_PRINT("%s",GET_IPADDR_STRING(tptr));
2183 tptr += sizeof(nd_ipv4);
2184 tnhlen -= sizeof(nd_ipv4);
2185 tlen -= sizeof(nd_ipv4);
2186 }
2187 break;
2188 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
2189 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
2190 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
2191 if (tnhlen < sizeof(nd_ipv4)+BGP_VPN_RD_LEN) {
2192 ND_PRINT("invalid len");
2193 tptr += tnhlen;
2194 tlen -= tnhlen;
2195 tnhlen = 0;
2196 } else {
2197 ND_PRINT("RD: %s, %s",
2198 bgp_vpn_rd_print(ndo, tptr),
2199 GET_IPADDR_STRING(tptr+BGP_VPN_RD_LEN));
2200 tptr += (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2201 tlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2202 tnhlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2203 }
2204 break;
2205 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
2206 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
2207 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
2208 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
2209 if (tnhlen < sizeof(nd_ipv6)) {
2210 ND_PRINT("invalid len");
2211 tptr += tnhlen;
2212 tlen -= tnhlen;
2213 tnhlen = 0;
2214 } else {
2215 ND_PRINT("%s", GET_IP6ADDR_STRING(tptr));
2216 tptr += sizeof(nd_ipv6);
2217 tlen -= sizeof(nd_ipv6);
2218 tnhlen -= sizeof(nd_ipv6);
2219 }
2220 break;
2221 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
2222 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
2223 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
2224 if (tnhlen < sizeof(nd_ipv6)+BGP_VPN_RD_LEN) {
2225 ND_PRINT("invalid len");
2226 tptr += tnhlen;
2227 tlen -= tnhlen;
2228 tnhlen = 0;
2229 } else {
2230 ND_PRINT("RD: %s, %s",
2231 bgp_vpn_rd_print(ndo, tptr),
2232 GET_IP6ADDR_STRING(tptr+BGP_VPN_RD_LEN));
2233 tptr += (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2234 tlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2235 tnhlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2236 }
2237 break;
2238 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
2239 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2240 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2241 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2242 if (tnhlen < sizeof(nd_ipv4)) {
2243 ND_PRINT("invalid len");
2244 tptr += tnhlen;
2245 tlen -= tnhlen;
2246 tnhlen = 0;
2247 } else {
2248 ND_PRINT("%s", GET_IPADDR_STRING(tptr));
2249 tptr += (sizeof(nd_ipv4));
2250 tlen -= (sizeof(nd_ipv4));
2251 tnhlen -= (sizeof(nd_ipv4));
2252 }
2253 break;
2254 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2255 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2256 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2257 ND_PRINT("%s", GET_ISONSAP_STRING(tptr, tnhlen));
2258 tptr += tnhlen;
2259 tlen -= tnhlen;
2260 tnhlen = 0;
2261 break;
2262
2263 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2264 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2265 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2266 if (tnhlen < BGP_VPN_RD_LEN+1) {
2267 ND_PRINT("invalid len");
2268 tptr += tnhlen;
2269 tlen -= tnhlen;
2270 tnhlen = 0;
2271 } else {
2272 ND_TCHECK_LEN(tptr, tnhlen);
2273 ND_PRINT("RD: %s, %s",
2274 bgp_vpn_rd_print(ndo, tptr),
2275 GET_ISONSAP_STRING(tptr+BGP_VPN_RD_LEN,tnhlen-BGP_VPN_RD_LEN));
2276 /* rfc986 mapped IPv4 address ? */
2277 if (GET_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
2278 ND_PRINT(" = %s", GET_IPADDR_STRING(tptr+BGP_VPN_RD_LEN+4));
2279 /* rfc1888 mapped IPv6 address ? */
2280 else if (GET_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
2281 ND_PRINT(" = %s", GET_IP6ADDR_STRING(tptr+BGP_VPN_RD_LEN+3));
2282 tptr += tnhlen;
2283 tlen -= tnhlen;
2284 tnhlen = 0;
2285 }
2286 break;
2287 default:
2288 /*
2289 * bgp_mp_af_print() should have saved us from
2290 * an unsupported AFI/SAFI.
2291 */
2292 ND_PRINT("ERROR: no AFI %u/SAFI %u nexthop decoder", af, safi);
2293 tptr += tnhlen;
2294 tlen -= tnhlen;
2295 tnhlen = 0;
2296 goto done;
2297 break;
2298 }
2299 }
2300 }
2301 ND_PRINT(", nh-length: %u", nhlen);
2302
2303 /* As per RFC 2858; this is reserved in RFC 4760 */
2304 if (tlen < 1)
2305 goto trunc;
2306 snpa = GET_U_1(tptr);
2307 tptr++;
2308 tlen--;
2309
2310 if (snpa) {
2311 ND_PRINT("\n\t %u SNPA", snpa);
2312 for (/*nothing*/; snpa != 0; snpa--) {
2313 uint8_t snpalen;
2314 if (tlen < 1)
2315 goto trunc;
2316 snpalen = GET_U_1(tptr);
2317 ND_PRINT("\n\t %u bytes", snpalen);
2318 tptr++;
2319 tlen--;
2320 if (tlen < snpalen)
2321 goto trunc;
2322 ND_TCHECK_LEN(tptr, snpalen);
2323 tptr += snpalen;
2324 tlen -= snpalen;
2325 }
2326 } else {
2327 ND_PRINT(", no SNPA");
2328 }
2329
2330 add_path4 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 32);
2331 add_path6 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 128);
2332
2333 while (tptr < pptr + len) {
2334 advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf),
2335 add_path4, add_path6);
2336 if (advance == -2)
2337 goto trunc;
2338 if (advance < 0)
2339 break;
2340 tptr += advance;
2341 }
2342 break;
2343
2344 case BGPTYPE_MP_UNREACH_NLRI:
2345 ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
2346 ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
2347 if (ret == -2)
2348 goto trunc;
2349 if (ret < 0)
2350 break;
2351
2352 if (len == BGP_MP_NLRI_MINSIZE)
2353 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2354
2355 tptr += 3;
2356
2357 add_path4 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 32);
2358 add_path6 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 128);
2359
2360 while (tptr < pptr + len) {
2361 advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf),
2362 add_path4, add_path6);
2363 if (advance == -2)
2364 goto trunc;
2365 if (advance < 0)
2366 break;
2367 tptr += advance;
2368 }
2369 break;
2370 case BGPTYPE_EXTD_COMMUNITIES:
2371 if (len % 8) {
2372 ND_PRINT("invalid len");
2373 break;
2374 }
2375 while (tlen != 0) {
2376 uint16_t extd_comm;
2377
2378 ND_TCHECK_2(tptr);
2379 if (tlen < 2)
2380 goto trunc;
2381 extd_comm=GET_BE_U_2(tptr);
2382
2383 ND_PRINT("\n\t %s (0x%04x), Flags [%s]",
2384 tok2str(bgp_extd_comm_subtype_values,
2385 "unknown extd community typecode",
2386 extd_comm),
2387 extd_comm,
2388 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm));
2389
2390 ND_TCHECK_8(tptr);
2391 if (tlen < 8)
2392 goto trunc;
2393 ND_PRINT(": ");
2394 bgp_extended_community_print(ndo, tptr);
2395 tlen -= 8;
2396 tptr += 8;
2397 }
2398 break;
2399
2400 case BGPTYPE_PMSI_TUNNEL:
2401 {
2402 uint8_t tunnel_type, flags;
2403
2404 ND_TCHECK_5(tptr);
2405 if (tlen < 5)
2406 goto trunc;
2407 flags = GET_U_1(tptr);
2408 tunnel_type = GET_U_1(tptr + 1);
2409
2410 ND_PRINT("\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2411 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2412 tunnel_type,
2413 bittok2str(bgp_pmsi_flag_values, "none", flags),
2414 GET_BE_U_3(tptr + 2)>>4);
2415
2416 tptr +=5;
2417 tlen -= 5;
2418
2419 switch (tunnel_type) {
2420 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2421 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2422 ND_PRINT("\n\t Sender %s, P-Group %s",
2423 GET_IPADDR_STRING(tptr),
2424 GET_IPADDR_STRING(tptr+4));
2425 break;
2426
2427 case BGP_PMSI_TUNNEL_PIM_SSM:
2428 ND_PRINT("\n\t Root-Node %s, P-Group %s",
2429 GET_IPADDR_STRING(tptr),
2430 GET_IPADDR_STRING(tptr+4));
2431 break;
2432 case BGP_PMSI_TUNNEL_INGRESS:
2433 ND_PRINT("\n\t Tunnel-Endpoint %s",
2434 GET_IPADDR_STRING(tptr));
2435 break;
2436 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2437 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2438 ND_PRINT("\n\t Root-Node %s, LSP-ID 0x%08x",
2439 GET_IPADDR_STRING(tptr),
2440 GET_BE_U_4(tptr + 4));
2441 break;
2442 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2443 ND_PRINT("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2444 GET_IPADDR_STRING(tptr),
2445 GET_BE_U_4(tptr + 4));
2446 break;
2447 default:
2448 if (ndo->ndo_vflag <= 1) {
2449 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2450 }
2451 }
2452 break;
2453 }
2454 case BGPTYPE_AIGP:
2455 {
2456 uint8_t type;
2457 uint16_t length;
2458
2459 while (tlen >= 3) {
2460 type = GET_U_1(tptr);
2461 length = GET_BE_U_2(tptr + 1);
2462 tptr += 3;
2463 tlen -= 3;
2464
2465 ND_PRINT("\n\t %s TLV (%u), length %u",
2466 tok2str(bgp_aigp_values, "Unknown", type),
2467 type, length);
2468
2469 if (length < 3)
2470 goto trunc;
2471 length -= 3;
2472
2473 /*
2474 * Check if we can read the TLV data.
2475 */
2476 if (tlen < length)
2477 goto trunc;
2478
2479 switch (type) {
2480
2481 case BGP_AIGP_TLV:
2482 if (length < 8)
2483 goto trunc;
2484 ND_PRINT(", metric %" PRIu64,
2485 GET_BE_U_8(tptr));
2486 break;
2487
2488 default:
2489 if (ndo->ndo_vflag <= 1) {
2490 print_unknown_data(ndo, tptr,"\n\t ", length);
2491 }
2492 }
2493
2494 tptr += length;
2495 tlen -= length;
2496 }
2497 break;
2498 }
2499 case BGPTYPE_ATTR_SET:
2500 ND_TCHECK_4(tptr);
2501 if (len < 4)
2502 goto trunc;
2503 ND_PRINT("\n\t Origin AS: %s",
2504 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)));
2505 tptr += 4;
2506 len -= 4;
2507
2508 while (len) {
2509 u_int aflags, alenlen, alen;
2510
2511 ND_TCHECK_2(tptr);
2512 if (len < 2) {
2513 ND_PRINT(" [path attr too short]");
2514 tptr += len;
2515 break;
2516 }
2517 aflags = GET_U_1(tptr);
2518 atype = GET_U_1(tptr + 1);
2519 tptr += 2;
2520 len -= 2;
2521 alenlen = bgp_attr_lenlen(aflags, tptr);
2522 ND_TCHECK_LEN(tptr, alenlen);
2523 if (len < alenlen) {
2524 ND_PRINT(" [path attr too short]");
2525 tptr += len;
2526 break;
2527 }
2528 alen = bgp_attr_len(aflags, tptr);
2529 tptr += alenlen;
2530 len -= alenlen;
2531
2532 ND_PRINT("\n\t %s (%u), length: %u",
2533 tok2str(bgp_attr_values,
2534 "Unknown Attribute", atype),
2535 atype,
2536 alen);
2537
2538 if (aflags) {
2539 ND_PRINT(", Flags [%s",
2540 bittok2str_nosep(bgp_flags, "", aflags));
2541 if (aflags & 0xf)
2542 ND_PRINT("+%x", aflags & 0xf);
2543 ND_PRINT("]");
2544 }
2545 ND_PRINT(": ");
2546 if (len < alen) {
2547 ND_PRINT(" [path attr too short]");
2548 tptr += len;
2549 break;
2550 }
2551 /*
2552 * The protocol encoding per se allows ATTR_SET to be nested
2553 * as many times as the message can accommodate. This printer
2554 * used to be able to recurse into ATTR_SET contents until the
2555 * stack exhaustion, but now there is a limit on that (if live
2556 * protocol exchange goes that many levels deep, something is
2557 * probably wrong anyway). Feel free to refine this value if
2558 * you can find the spec with respective normative text.
2559 */
2560 if (attr_set_level == 10)
2561 ND_PRINT("(too many nested levels, not recursing)");
2562 else if (!bgp_attr_print(ndo, atype, tptr, alen, attr_set_level + 1))
2563 return 0;
2564 tptr += alen;
2565 len -= alen;
2566 }
2567 break;
2568
2569 case BGPTYPE_LARGE_COMMUNITY:
2570 if (len == 0 || len % 12) {
2571 ND_PRINT("invalid len");
2572 break;
2573 }
2574 ND_PRINT("\n\t ");
2575 while (len != 0) {
2576 ND_PRINT("%u:%u:%u%s",
2577 GET_BE_U_4(tptr),
2578 GET_BE_U_4(tptr + 4),
2579 GET_BE_U_4(tptr + 8),
2580 (len > 12) ? ", " : "");
2581 tptr += 12;
2582 /*
2583 * len will always be a multiple of 12, as per the above,
2584 * so this will never underflow.
2585 */
2586 len -= 12;
2587 }
2588 break;
2589 case BGPTYPE_BGPSEC_PATH:
2590 {
2591 uint16_t sblen, splen;
2592
2593 splen = GET_BE_U_2(tptr);
2594
2595 /*
2596 * A secure path has a minimum length of 8 bytes:
2597 * 2 bytes length field
2598 * 6 bytes per secure path segment
2599 */
2600 ND_ICHECKMSG_U("secure path length", splen, <, 8);
2601
2602 ND_PRINT("\n\t Secure Path Length: %u", splen);
2603
2604 tptr += 2;
2605 splen -= 2;
2606 /* Make sure the secure path length does not signal trailing bytes */
2607 if (splen % 6) {
2608 ND_PRINT(" [total segments length %u != N x 6]", splen);
2609 goto invalid;
2610 }
2611
2612 /* Parse secure path segments */
2613 while (splen != 0) {
2614 uint8_t pcount = GET_U_1(tptr);
2615 uint8_t flags = GET_U_1(tptr + 1);
2616 uint32_t asn = GET_BE_U_4(tptr + 2);
2617 ND_PRINT("\n\t Secure Path Segment: pCount: %u, Flags: [%s] (0x%02x), AS: %u",
2618 pcount,
2619 bittok2str(bgp_bgpsec_bitmap_str, "none", flags),
2620 flags,
2621 asn);
2622 tptr += 6;
2623 splen -= 6;
2624 }
2625
2626 sblen = GET_BE_U_2(tptr);
2627
2628 ND_PRINT("\n\t Signature Block: Length: %u, Algo ID: %u",
2629 sblen,
2630 GET_U_1(tptr + 2));
2631
2632 tptr += 3;
2633 sblen -= 3;
2634 /* Parse signature segments */
2635 while (sblen > 0) {
2636 uint16_t siglen;
2637
2638 ND_PRINT("\n\t Signature Segment:\n\t SKI: ");
2639 ND_ICHECKMSG_U("remaining length", sblen, <, 20);
2640 hex_print(ndo, "\n\t ", tptr, 20);
2641 tptr += 20;
2642 sblen -= 20;
2643 ND_ICHECKMSG_U("remaining length", sblen, <, 2);
2644 siglen = GET_BE_U_2(tptr);
2645 tptr += 2;
2646 sblen -= 2;
2647
2648 ND_PRINT("\n\t Length: %u", siglen);
2649 ND_ICHECKMSG_U("remaining length", sblen, <, siglen);
2650 ND_PRINT("\n\t Signature:");
2651 hex_print(ndo, "\n\t ", tptr, siglen);
2652 tptr += siglen;
2653 sblen -= siglen;
2654 }
2655 break;
2656 }
2657 default:
2658 ND_TCHECK_LEN(pptr, len);
2659 ND_PRINT("\n\t no Attribute %u decoder", atype); /* we have no decoder for the attribute */
2660 if (ndo->ndo_vflag <= 1)
2661 print_unknown_data(ndo, pptr, "\n\t ", len);
2662 break;
2663 }
2664 done:
2665 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2666 ND_TCHECK_LEN(pptr, len);
2667 print_unknown_data(ndo, pptr, "\n\t ", len);
2668 }
2669 return 1;
2670
2671 invalid:
2672 nd_print_invalid(ndo);
2673 return 1;
2674
2675 trunc:
2676 return 0;
2677 }
2678
2679 static void
2680 bgp_capabilities_print(netdissect_options *ndo,
2681 const u_char *opt, u_int caps_len)
2682 {
2683 /* allocate space for the largest possible string */
2684 char astostr[AS_STR_SIZE];
2685 u_int cap_type, cap_len, tcap_len, cap_offset;
2686 u_int i = 0;
2687
2688 while (i < caps_len) {
2689 ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
2690 cap_type=GET_U_1(opt + i);
2691 cap_len=GET_U_1(opt + i + 1);
2692 ND_PRINT("\n\t %s (%u), length: %u",
2693 tok2str(bgp_capcode_values, "Unknown", cap_type),
2694 cap_type,
2695 cap_len);
2696 ND_TCHECK_LEN(opt + 2 + i, cap_len);
2697 switch (cap_type) {
2698 case BGP_CAPCODE_MP:
2699 /* AFI (16 bits), Reserved (8 bits), SAFI (8 bits) */
2700 if (cap_len < 4) {
2701 ND_PRINT(" (too short, < 4)");
2702 return;
2703 }
2704 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u)",
2705 tok2str(af_values, "Unknown", GET_BE_U_2(opt + i + 2)),
2706 GET_BE_U_2(opt + i + 2),
2707 tok2str(bgp_safi_values, "Unknown", GET_U_1(opt + i + 5)),
2708 GET_U_1(opt + i + 5));
2709 break;
2710 case BGP_CAPCODE_BGPSEC:
2711 /* Version (4 bits), Direction (1 bit), Flags (3 bits), AFI (16 bits) */
2712 cap_offset = 1;
2713 /* The capability length [...] MUST be set to 3. */
2714 if (cap_len != 3) {
2715 ND_PRINT(" [%u != 3]", cap_len);
2716 return;
2717 }
2718
2719 ND_PRINT("\n\t\tVersion %u, Direction %s (%u), AFI %s (%u)",
2720 GET_U_1(opt + i + 2)&0xf0,
2721 (GET_U_1(opt + i + 2)&0x08) ? "Send" : "Receive",
2722 (GET_U_1(opt + i + 2)&0x08)>>3,
2723 bittok2str(af_values, "Unknown",
2724 GET_BE_U_2(opt + i + cap_offset + 2)),
2725 GET_BE_U_2(opt + i + cap_offset + 2));
2726 break;
2727 case BGP_CAPCODE_ML:
2728 cap_offset = 2;
2729 tcap_len = cap_len;
2730 while (tcap_len >= 4) {
2731 ND_PRINT( "\n\t\tAFI %s (%u), SAFI %s (%u), Count: %u",
2732 tok2str(af_values, "Unknown",
2733 GET_BE_U_2(opt + i + cap_offset)),
2734 GET_BE_U_2(opt + i + cap_offset),
2735 tok2str(bgp_safi_values, "Unknown",
2736 GET_U_1(opt + i + cap_offset + 2)),
2737 GET_U_1(opt + i + cap_offset + 2),
2738 GET_U_1(opt + i + cap_offset + 3));
2739 tcap_len -= 4;
2740 cap_offset += 4;
2741 }
2742 break;
2743 case BGP_CAPCODE_RESTART:
2744 /* Restart Flags (4 bits), Restart Time in seconds (12 bits) */
2745 if (cap_len < 2) {
2746 ND_PRINT(" (too short, < 2)");
2747 return;
2748 }
2749 tcap_len=cap_len;
2750 ND_PRINT("\n\t\tRestart Flags: [%s], Restart Time %us",
2751 bittok2str(bgp_graceful_restart_comm_flag_values,
2752 "none", GET_U_1(opt + i + 2) >> 4),
2753 GET_BE_U_2(opt + i + 2)&0xfff);
2754 tcap_len-=2;
2755 cap_offset=4;
2756 while(tcap_len>=4) {
2757 ND_PRINT("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2758 tok2str(af_values,"Unknown",
2759 GET_BE_U_2(opt + i + cap_offset)),
2760 GET_BE_U_2(opt + i + cap_offset),
2761 tok2str(bgp_safi_values,"Unknown",
2762 GET_U_1(opt + i + cap_offset + 2)),
2763 GET_U_1(opt + (i + cap_offset + 2)),
2764 ((GET_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" );
2765 tcap_len -= 4;
2766 cap_offset += 4;
2767 }
2768 break;
2769 case BGP_CAPCODE_RR:
2770 case BGP_CAPCODE_LLGR:
2771 case BGP_CAPCODE_RR_CISCO:
2772 case BGP_CAPCODE_EXT_MSG:
2773 case BGP_CAPCODE_ENH_RR:
2774 break;
2775 case BGP_CAPCODE_AS_NEW:
2776 /*
2777 * Extract the 4 byte AS number encoded.
2778 */
2779 if (cap_len < 4) {
2780 ND_PRINT(" (too short, < 4)");
2781 return;
2782 }
2783 ND_PRINT("\n\t\t 4 Byte AS %s",
2784 as_printf(ndo, astostr, sizeof(astostr),
2785 GET_BE_U_4(opt + i + 2)));
2786 break;
2787 case BGP_CAPCODE_ADD_PATH:
2788 if (cap_len == 0) {
2789 ND_PRINT(" (bogus)"); /* length */
2790 break;
2791 }
2792 tcap_len=cap_len;
2793 cap_offset=2;
2794 while (tcap_len != 0) {
2795 if (tcap_len < 4) {
2796 nd_print_invalid(ndo);
2797 break;
2798 }
2799 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2800 tok2str(af_values,"Unknown",GET_BE_U_2(opt + i + cap_offset)),
2801 GET_BE_U_2(opt + i + cap_offset),
2802 tok2str(bgp_safi_values,"Unknown",GET_U_1(opt + i + cap_offset + 2)),
2803 GET_U_1(opt + (i + cap_offset + 2)),
2804 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",GET_U_1(opt + i + cap_offset + 3))
2805 );
2806 tcap_len -= 4;
2807 cap_offset += 4;
2808 }
2809 break;
2810 default:
2811 ND_PRINT("\n\t\tno decoder for Capability %u",
2812 cap_type);
2813 if (ndo->ndo_vflag <= 1)
2814 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2815 cap_len);
2816 break;
2817 }
2818 if (ndo->ndo_vflag > 1 && cap_len != 0) {
2819 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2820 }
2821 i += BGP_CAP_HEADER_SIZE + cap_len;
2822 }
2823 return;
2824
2825 trunc:
2826 nd_print_trunc(ndo);
2827 }
2828
2829 static void
2830 bgp_open_print(netdissect_options *ndo,
2831 const u_char *dat, u_int length)
2832 {
2833 /* allocate space for the largest possible string */
2834 char astostr[AS_STR_SIZE];
2835 const struct bgp_open *bgp_open_header;
2836 u_int optslen;
2837 uint8_t opsttype;
2838 const struct bgp_opt *bgpopt;
2839 const u_char *opt;
2840 u_int i;
2841 uint8_t extended_opt_params = 0;
2842 u_int open_size = BGP_OPEN_SIZE;
2843 u_int opt_size = BGP_OPT_SIZE;
2844
2845 ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
2846 if (length < BGP_OPEN_SIZE)
2847 goto trunc;
2848
2849 bgp_open_header = (const struct bgp_open *)dat;
2850
2851 ND_PRINT("\n\t Version %u, ",
2852 GET_U_1(bgp_open_header->bgpo_version));
2853 ND_PRINT("my AS %s, ",
2854 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(bgp_open_header->bgpo_myas)));
2855 ND_PRINT("Holdtime %us, ",
2856 GET_BE_U_2(bgp_open_header->bgpo_holdtime));
2857 ND_PRINT("ID %s", GET_IPADDR_STRING(bgp_open_header->bgpo_id));
2858 optslen = GET_U_1(bgp_open_header->bgpo_optlen);
2859 opsttype = GET_U_1(bgp_open_header->bgpo_opttype);
2860 if (opsttype == BGP_OPEN_NON_EXT_OPT_TYPE_EXTENDED_LENGTH) {
2861 optslen = GET_BE_U_2(bgp_open_header->bgpo_optlen_extended);
2862 extended_opt_params = 1;
2863 open_size += 3;
2864 opt_size += 1;
2865 }
2866 ND_PRINT("\n\t Optional parameters%s, length: %u",
2867 extended_opt_params ? " (Extended)" : "", optslen);
2868
2869 opt = dat + open_size;
2870 length -= open_size;
2871
2872 i = 0;
2873 while (i < optslen) {
2874 uint8_t opt_type;
2875 uint16_t opt_len;
2876
2877 ND_TCHECK_LEN(opt + i, opt_size);
2878 if (length < opt_size + i)
2879 goto trunc;
2880 bgpopt = (const struct bgp_opt *)(opt + i);
2881 opt_type = GET_U_1(bgpopt->bgpopt_type);
2882 opt_len = extended_opt_params ? GET_BE_U_2(bgpopt->bgpopt_len)
2883 : GET_U_1(bgpopt->bgpopt_len);
2884 if (opt_size + i + opt_len > optslen) {
2885 ND_PRINT("\n\t Option %u, length: %u, goes past the end of the options",
2886 opt_type, opt_len);
2887 break;
2888 }
2889
2890 ND_PRINT("\n\t Option %s (%u), length: %u",
2891 tok2str(bgp_opt_values,"Unknown",opt_type),
2892 opt_type,
2893 opt_len);
2894
2895 /* now let's decode the options we know*/
2896 switch(opt_type) {
2897
2898 case BGP_OPT_CAP:
2899 bgp_capabilities_print(ndo, opt + opt_size + i,
2900 opt_len);
2901 break;
2902
2903 case BGP_OPT_AUTH:
2904 default:
2905 ND_PRINT("\n\t no decoder for option %u",
2906 opt_type);
2907 break;
2908 }
2909 i += opt_size + opt_len;
2910 }
2911 return;
2912 trunc:
2913 nd_print_trunc(ndo);
2914 }
2915
2916 static void
2917 bgp_update_print(netdissect_options *ndo,
2918 const u_char *dat, u_int length)
2919 {
2920 const u_char *p;
2921 u_int withdrawn_routes_len;
2922 char buf[MAXHOSTNAMELEN + 100];
2923 int wpfx;
2924 u_int len;
2925 int i;
2926 int add_path;
2927 u_int path_id = 0;
2928
2929 ND_TCHECK_LEN(dat, BGP_SIZE);
2930 if (length < BGP_SIZE)
2931 goto trunc;
2932 p = dat + BGP_SIZE;
2933 length -= BGP_SIZE;
2934
2935 /* Unfeasible routes */
2936 ND_TCHECK_2(p);
2937 if (length < 2)
2938 goto trunc;
2939 withdrawn_routes_len = GET_BE_U_2(p);
2940 p += 2;
2941 length -= 2;
2942 if (withdrawn_routes_len > 1) {
2943 /*
2944 * Without keeping state from the original NLRI message,
2945 * it's not possible to tell if this a v4 or v6 route,
2946 * so only try to decode it if we're not v6 enabled.
2947 */
2948 ND_TCHECK_LEN(p, withdrawn_routes_len);
2949 if (length < withdrawn_routes_len)
2950 goto trunc;
2951 ND_PRINT("\n\t Withdrawn routes:");
2952 add_path = check_add_path(ndo, p, withdrawn_routes_len, 32);
2953 while (withdrawn_routes_len != 0) {
2954 if (add_path) {
2955 if (withdrawn_routes_len < 4) {
2956 p += withdrawn_routes_len;
2957 length -= withdrawn_routes_len;
2958 break;
2959 }
2960 path_id = GET_BE_U_4(p);
2961 p += 4;
2962 length -= 4;
2963 withdrawn_routes_len -= 4;
2964 }
2965 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
2966 if (wpfx == -1) {
2967 ND_PRINT("\n\t (illegal prefix length)");
2968 break;
2969 } else if (wpfx == -2)
2970 goto trunc; /* bytes left, but not enough */
2971 else {
2972 ND_PRINT("\n\t %s", buf);
2973 if (add_path) {
2974 ND_PRINT(" Path Id: %u", path_id);
2975 }
2976 p += wpfx;
2977 length -= wpfx;
2978 withdrawn_routes_len -= wpfx;
2979 }
2980 }
2981 } else {
2982 ND_TCHECK_LEN(p, withdrawn_routes_len);
2983 if (length < withdrawn_routes_len)
2984 goto trunc;
2985 p += withdrawn_routes_len;
2986 length -= withdrawn_routes_len;
2987 }
2988
2989 ND_TCHECK_2(p);
2990 if (length < 2)
2991 goto trunc;
2992 len = GET_BE_U_2(p);
2993 p += 2;
2994 length -= 2;
2995
2996 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2997 /* No withdrawn routes, no path attributes, no NLRI */
2998 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2999 return;
3000 }
3001
3002 if (len) {
3003 /* Make sure the path attributes don't go past the end of the packet */
3004 if (length < len)
3005 goto trunc;
3006 /* do something more useful!*/
3007 while (len) {
3008 uint8_t aflags, atype, alenlen;
3009 uint16_t alen;
3010
3011 ND_TCHECK_2(p);
3012 if (length < 2)
3013 goto trunc;
3014 if (len < 2) {
3015 ND_PRINT("\n\t [path attrs too short]");
3016 p += len;
3017 length -= len;
3018 break;
3019 }
3020 aflags = GET_U_1(p);
3021 atype = GET_U_1(p + 1);
3022 p += 2;
3023 len -= 2;
3024 length -= 2;
3025 alenlen = bgp_attr_lenlen(aflags, p);
3026 ND_TCHECK_LEN(p, alenlen);
3027 if (length < alenlen)
3028 goto trunc;
3029 if (len < alenlen) {
3030 ND_PRINT("\n\t [path attrs too short]");
3031 p += len;
3032 length -= len;
3033 break;
3034 }
3035 alen = bgp_attr_len(aflags, p);
3036 p += alenlen;
3037 len -= alenlen;
3038 length -= alenlen;
3039
3040 ND_PRINT("\n\t %s (%u), length: %u",
3041 tok2str(bgp_attr_values, "Unknown Attribute", atype),
3042 atype,
3043 alen);
3044
3045 if (aflags) {
3046 ND_PRINT(", Flags [%s",
3047 bittok2str_nosep(bgp_flags, "", aflags));
3048 if (aflags & 0xf)
3049 ND_PRINT("+%x", aflags & 0xf);
3050 ND_PRINT("]: ");
3051 }
3052 if (len < alen) {
3053 ND_PRINT(" [path attrs too short]");
3054 p += len;
3055 length -= len;
3056 break;
3057 }
3058 if (length < alen)
3059 goto trunc;
3060 if (!bgp_attr_print(ndo, atype, p, alen, 0))
3061 goto trunc;
3062 p += alen;
3063 len -= alen;
3064 length -= alen;
3065 }
3066 }
3067
3068 if (length) {
3069 add_path = check_add_path(ndo, p, length, 32);
3070 ND_PRINT("\n\t Updated routes:");
3071 while (length != 0) {
3072 if (add_path) {
3073 ND_TCHECK_4(p);
3074 if (length < 4)
3075 goto trunc;
3076 path_id = GET_BE_U_4(p);
3077 p += 4;
3078 length -= 4;
3079 }
3080 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
3081 if (i == -1) {
3082 ND_PRINT("\n\t (illegal prefix length)");
3083 break;
3084 } else if (i == -2)
3085 goto trunc; /* bytes left, but not enough */
3086 else {
3087 ND_PRINT("\n\t %s", buf);
3088 if (add_path) {
3089 ND_PRINT(" Path Id: %u", path_id);
3090 }
3091 p += i;
3092 length -= i;
3093 }
3094 }
3095 }
3096 return;
3097 trunc:
3098 nd_print_trunc(ndo);
3099 }
3100
3101 static void
3102 bgp_notification_print_code(netdissect_options *ndo,
3103 const u_char *dat, u_int length,
3104 uint8_t bgpn_major, uint8_t bgpn_minor)
3105 {
3106 ND_PRINT(", %s (%u)",
3107 tok2str(bgp_notify_major_values, "Unknown Error",
3108 bgpn_major),
3109 bgpn_major);
3110
3111 switch (bgpn_major) {
3112
3113 case BGP_NOTIFY_MAJOR_MSG:
3114 ND_PRINT(", subcode %s (%u)",
3115 tok2str(bgp_notify_minor_msg_values, "Unknown",
3116 bgpn_minor),
3117 bgpn_minor);
3118 break;
3119 case BGP_NOTIFY_MAJOR_OPEN:
3120 ND_PRINT(", subcode %s (%u)",
3121 tok2str(bgp_notify_minor_open_values, "Unknown",
3122 bgpn_minor),
3123 bgpn_minor);
3124 break;
3125 case BGP_NOTIFY_MAJOR_UPDATE:
3126 ND_PRINT(", subcode %s (%u)",
3127 tok2str(bgp_notify_minor_update_values, "Unknown",
3128 bgpn_minor),
3129 bgpn_minor);
3130 break;
3131 case BGP_NOTIFY_MAJOR_FSM:
3132 ND_PRINT(" subcode %s (%u)",
3133 tok2str(bgp_notify_minor_fsm_values, "Unknown",
3134 bgpn_minor),
3135 bgpn_minor);
3136 break;
3137 case BGP_NOTIFY_MAJOR_CAP:
3138 ND_PRINT(" subcode %s (%u)",
3139 tok2str(bgp_notify_minor_cap_values, "Unknown",
3140 bgpn_minor),
3141 bgpn_minor);
3142 break;
3143 case BGP_NOTIFY_MAJOR_CEASE:
3144 ND_PRINT(", subcode %s (%u)",
3145 tok2str(bgp_notify_minor_cease_values, "Unknown",
3146 bgpn_minor),
3147 bgpn_minor);
3148
3149 /* RFC 4486 mentions optionally 7 bytes
3150 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
3151 */
3152 if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= 7) {
3153 ND_PRINT(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
3154 tok2str(af_values, "Unknown", GET_BE_U_2(dat)),
3155 GET_BE_U_2(dat),
3156 tok2str(bgp_safi_values, "Unknown", GET_U_1((dat + 2))),
3157 GET_U_1((dat + 2)),
3158 GET_BE_U_4(dat + 3));
3159 }
3160 /*
3161 * RFC 9003 describes a method to send a communication
3162 * intended for human consumption regarding the Administrative Shutdown
3163 */
3164 if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
3165 bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
3166 length >= 1) {
3167 uint8_t shutdown_comm_length = GET_U_1(dat);
3168 uint8_t remainder_offset = 0;
3169 /* garbage, hexdump it all */
3170 if (shutdown_comm_length > length - 1) {
3171 ND_PRINT(", invalid Shutdown Communication length");
3172 }
3173 else if (shutdown_comm_length == 0) {
3174 ND_PRINT(", empty Shutdown Communication");
3175 remainder_offset += 1;
3176 }
3177 /* a proper shutdown communication */
3178 else {
3179 ND_PRINT(", Shutdown Communication (length: %u): \"", shutdown_comm_length);
3180 nd_printjn(ndo, dat+1, shutdown_comm_length);
3181 ND_PRINT("\"");
3182 remainder_offset += shutdown_comm_length + 1;
3183 }
3184 /* if there is trailing data, hexdump it */
3185 if(length - remainder_offset > 0) {
3186 ND_PRINT(", Data: (length: %u)", length - remainder_offset);
3187 hex_print(ndo, "\n\t\t", dat + remainder_offset, length - remainder_offset);
3188 }
3189 }
3190 /*
3191 * RFC8538 describes the Hard Reset cease subcode, which contains another
3192 * notification code and subcode.
3193 */
3194 if (bgpn_minor == BGP_NOTIFY_MINOR_CEASE_HARDRESET && length >= 2) {
3195 bgpn_major = GET_U_1(dat++);
3196 bgpn_minor = GET_U_1(dat++);
3197 length -= 2;
3198 bgp_notification_print_code(ndo, dat, length, bgpn_major, bgpn_minor);
3199 }
3200 break;
3201 default:
3202 if (bgpn_minor != 0) {
3203 ND_PRINT(", subcode %u", bgpn_minor);
3204 }
3205 break;
3206 }
3207
3208 return;
3209 }
3210
3211 static void
3212 bgp_notification_print(netdissect_options *ndo,
3213 const u_char *dat, u_int length)
3214 {
3215 const struct bgp_notification *bgp_notification_header;
3216 uint8_t bgpn_major, bgpn_minor;
3217
3218 ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
3219 if (length<BGP_NOTIFICATION_SIZE)
3220 return;
3221
3222 bgp_notification_header = (const struct bgp_notification *)dat;
3223 bgpn_major = GET_U_1(bgp_notification_header->bgpn_major);
3224 bgpn_minor = GET_U_1(bgp_notification_header->bgpn_minor);
3225 bgp_notification_print_code(ndo, dat + BGP_NOTIFICATION_SIZE,
3226 length - BGP_NOTIFICATION_SIZE, bgpn_major, bgpn_minor);
3227 return;
3228 trunc:
3229 nd_print_trunc(ndo);
3230 }
3231
3232 static void
3233 bgp_route_refresh_print(netdissect_options *ndo,
3234 const u_char *pptr, u_int len)
3235 {
3236 const struct bgp_route_refresh *bgp_route_refresh_header;
3237
3238 /* some little sanity checking */
3239 if (len<BGP_ROUTE_REFRESH_SIZE)
3240 return;
3241
3242 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
3243
3244 ND_PRINT("\n\t AFI %s (%u), SAFI %s (%u), Subtype %s (%u)",
3245 tok2str(af_values, "Unknown",
3246 GET_BE_U_2(bgp_route_refresh_header->afi)),
3247 GET_BE_U_2(bgp_route_refresh_header->afi),
3248 tok2str(bgp_safi_values, "Unknown",
3249 GET_U_1(bgp_route_refresh_header->safi)),
3250 GET_U_1(bgp_route_refresh_header->safi),
3251 tok2str(bgp_route_refresh_subtype_values, "Unknown",
3252 GET_U_1(bgp_route_refresh_header->subtype)),
3253 GET_U_1(bgp_route_refresh_header->subtype));
3254
3255 /* ORF */
3256 if (len >= BGP_ROUTE_REFRESH_SIZE_ORF) {
3257 const struct bgp_route_refresh_orf *orf_header;
3258
3259 orf_header =
3260 (const struct bgp_route_refresh_orf *)(pptr + BGP_ROUTE_REFRESH_SIZE);
3261
3262 ND_PRINT("\n\t ORF refresh %s (%u), ORF type %s (%u), ORF length %u",
3263 tok2str(bgp_orf_refresh_type, "Unknown",
3264 GET_U_1(orf_header->refresh)),
3265 GET_U_1(orf_header->refresh),
3266 tok2str(bgp_orf_type, "Unknown", GET_U_1(orf_header->type)),
3267 GET_U_1(orf_header->type), GET_BE_U_2(orf_header->len));
3268 }
3269
3270 if (ndo->ndo_vflag > 1) {
3271 ND_TCHECK_LEN(pptr, len);
3272 print_unknown_data(ndo, pptr, "\n\t ", len);
3273 }
3274
3275 return;
3276 trunc:
3277 nd_print_trunc(ndo);
3278 }
3279
3280 static int
3281 bgp_pdu_print(netdissect_options *ndo,
3282 const u_char *dat, u_int length)
3283 {
3284 const struct bgp *bgp_header;
3285 uint8_t bgp_type;
3286
3287 ND_TCHECK_LEN(dat, BGP_SIZE);
3288 bgp_header = (const struct bgp *)dat;
3289 bgp_type = GET_U_1(bgp_header->bgp_type);
3290
3291 ND_PRINT("\n\t%s Message (%u), length: %u",
3292 tok2str(bgp_msg_values, "Unknown", bgp_type),
3293 bgp_type,
3294 length);
3295
3296 switch (bgp_type) {
3297 case BGP_OPEN:
3298 bgp_open_print(ndo, dat, length);
3299 break;
3300 case BGP_UPDATE:
3301 bgp_update_print(ndo, dat, length);
3302 break;
3303 case BGP_NOTIFICATION:
3304 bgp_notification_print(ndo, dat, length);
3305 break;
3306 case BGP_KEEPALIVE:
3307 break;
3308 case BGP_ROUTE_REFRESH:
3309 bgp_route_refresh_print(ndo, dat, length);
3310 break;
3311 default:
3312 /* we have no decoder for the BGP message */
3313 ND_TCHECK_LEN(dat, length);
3314 ND_PRINT("\n\t no Message %u decoder", bgp_type);
3315 print_unknown_data(ndo, dat, "\n\t ", length);
3316 break;
3317 }
3318 return 1;
3319 trunc:
3320 nd_print_trunc(ndo);
3321 return 0;
3322 }
3323
3324 void
3325 bgp_print(netdissect_options *ndo,
3326 const u_char *dat, u_int length _U_)
3327 {
3328 const u_char *p;
3329 const u_char *ep = ndo->ndo_snapend;
3330 const u_char *start;
3331 const u_char marker[] = {
3332 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3333 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3334 };
3335 const struct bgp *bgp_header;
3336 uint16_t hlen;
3337
3338 ndo->ndo_protocol = "bgp";
3339 ND_PRINT(": BGP");
3340
3341 if (ndo->ndo_vflag < 1) /* lets be less chatty */
3342 return;
3343
3344 p = dat;
3345 start = p;
3346 while (p < ep) {
3347 if (!ND_TTEST_1(p))
3348 break;
3349 if (GET_U_1(p) != 0xff) {
3350 p++;
3351 continue;
3352 }
3353
3354 if (!ND_TTEST_LEN(p, sizeof(marker)))
3355 break;
3356 if (memcmp(p, marker, sizeof(marker)) != 0) {
3357 p++;
3358 continue;
3359 }
3360
3361 /* found BGP header */
3362 ND_TCHECK_LEN(p, BGP_SIZE);
3363 bgp_header = (const struct bgp *)p;
3364
3365 if (start != p)
3366 nd_print_trunc(ndo);
3367
3368 hlen = GET_BE_U_2(bgp_header->bgp_len);
3369 if (hlen < BGP_SIZE) {
3370 ND_PRINT("\nmessage length %u < %u", hlen, BGP_SIZE);
3371 nd_print_invalid(ndo);
3372 break;
3373 }
3374
3375 if (ND_TTEST_LEN(p, hlen)) {
3376 if (!bgp_pdu_print(ndo, p, hlen))
3377 return;
3378 p += hlen;
3379 start = p;
3380 } else {
3381 ND_PRINT("\n[|BGP %s]",
3382 tok2str(bgp_msg_values,
3383 "Unknown Message Type",
3384 GET_U_1(bgp_header->bgp_type)));
3385 break;
3386 }
3387 }
3388
3389 return;
3390
3391 trunc:
3392 nd_print_trunc(ndo);
3393 }
[mirror] the TCPdump network dissector