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Use nd_ipv6 rather than struct in6_addr
[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 /* options should follow */
84 };
85 #define BGP_OPEN_SIZE 29 /* unaligned */
86
87 struct bgp_opt {
88 nd_uint8_t bgpopt_type;
89 nd_uint8_t bgpopt_len;
90 /* variable length */
91 };
92 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
93 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
94
95 struct bgp_notification {
96 nd_byte bgpn_marker[16];
97 nd_uint16_t bgpn_len;
98 nd_uint8_t bgpn_type;
99 nd_uint8_t bgpn_major;
100 nd_uint8_t bgpn_minor;
101 };
102 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
103
104 struct bgp_route_refresh {
105 nd_byte bgp_marker[16];
106 nd_uint16_t len;
107 nd_uint8_t type; /* No padding after this; afi is, in fact, not aligned */
108 nd_uint16_t afi;
109 nd_uint8_t res;
110 nd_uint8_t safi;
111 };
112 #define BGP_ROUTE_REFRESH_SIZE 23
113
114 #define bgp_attr_lenlen(flags, p) \
115 (((flags) & 0x10) ? 2U : 1U)
116 #define bgp_attr_len(flags, p) \
117 (((flags) & 0x10) ? GET_BE_U_2(p) : GET_U_1(p))
118
119 #define BGPTYPE_ORIGIN 1
120 #define BGPTYPE_AS_PATH 2
121 #define BGPTYPE_NEXT_HOP 3
122 #define BGPTYPE_MULTI_EXIT_DISC 4
123 #define BGPTYPE_LOCAL_PREF 5
124 #define BGPTYPE_ATOMIC_AGGREGATE 6
125 #define BGPTYPE_AGGREGATOR 7
126 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
127 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */
128 #define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */
129 #define BGPTYPE_DPA 11 /* deprecated, draft-ietf-idr-bgp-dpa */
130 #define BGPTYPE_ADVERTISERS 12 /* deprecated RFC1863 */
131 #define BGPTYPE_RCID_PATH 13 /* deprecated RFC1863 */
132 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */
133 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */
134 #define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */
135 #define BGPTYPE_AS4_PATH 17 /* RFC6793 */
136 #define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */
137 #define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */
138 #define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */
139 #define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */
140 #define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */
141 #define BGPTYPE_AIGP 26 /* RFC7311 */
142 #define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */
143 #define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */
144 #define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */
145 #define BGPTYPE_ATTR_SET 128 /* RFC6368 */
146
147 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
148
149 static const struct tok bgp_attr_values[] = {
150 { BGPTYPE_ORIGIN, "Origin"},
151 { BGPTYPE_AS_PATH, "AS Path"},
152 { BGPTYPE_AS4_PATH, "AS4 Path"},
153 { BGPTYPE_NEXT_HOP, "Next Hop"},
154 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
155 { BGPTYPE_LOCAL_PREF, "Local Preference"},
156 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
157 { BGPTYPE_AGGREGATOR, "Aggregator"},
158 { BGPTYPE_AGGREGATOR4, "Aggregator4"},
159 { BGPTYPE_COMMUNITIES, "Community"},
160 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
161 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
162 { BGPTYPE_DPA, "DPA"},
163 { BGPTYPE_ADVERTISERS, "Advertisers"},
164 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"},
165 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
166 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
167 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
168 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
169 { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"},
170 { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"},
171 { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
172 { BGPTYPE_AIGP, "Accumulated IGP Metric"},
173 { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
174 { BGPTYPE_ENTROPY_LABEL, "Entropy Label"},
175 { BGPTYPE_LARGE_COMMUNITY, "Large Community"},
176 { BGPTYPE_ATTR_SET, "Attribute Set"},
177 { 255, "Reserved for development"},
178 { 0, NULL}
179 };
180
181 #define BGP_AS_SET 1
182 #define BGP_AS_SEQUENCE 2
183 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
184 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
185
186 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
187 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
188
189 static const struct tok bgp_as_path_segment_open_values[] = {
190 { BGP_AS_SEQUENCE, ""},
191 { BGP_AS_SET, "{ "},
192 { BGP_CONFED_AS_SEQUENCE, "( "},
193 { BGP_CONFED_AS_SET, "({ "},
194 { 0, NULL}
195 };
196
197 static const struct tok bgp_as_path_segment_close_values[] = {
198 { BGP_AS_SEQUENCE, ""},
199 { BGP_AS_SET, "}"},
200 { BGP_CONFED_AS_SEQUENCE, ")"},
201 { BGP_CONFED_AS_SET, "})"},
202 { 0, NULL}
203 };
204
205 #define BGP_OPT_AUTH 1
206 #define BGP_OPT_CAP 2
207
208 static const struct tok bgp_opt_values[] = {
209 { BGP_OPT_AUTH, "Authentication Information"},
210 { BGP_OPT_CAP, "Capabilities Advertisement"},
211 { 0, NULL}
212 };
213
214 #define BGP_CAPCODE_MP 1 /* RFC2858 */
215 #define BGP_CAPCODE_RR 2 /* RFC2918 */
216 #define BGP_CAPCODE_ORF 3 /* RFC5291 */
217 #define BGP_CAPCODE_MR 4 /* RFC3107 */
218 #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */
219 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */
220 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
221 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
222 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
223 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
224 #define BGP_CAPCODE_ENH_RR 70 /* draft-keyur-bgp-enhanced-route-refresh */
225 #define BGP_CAPCODE_RR_CISCO 128
226
227 static const struct tok bgp_capcode_values[] = {
228 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
229 { BGP_CAPCODE_RR, "Route Refresh"},
230 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
231 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
232 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
233 { BGP_CAPCODE_RESTART, "Graceful Restart"},
234 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
235 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
236 { BGP_CAPCODE_MULTISESS, "Multisession BGP"},
237 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
238 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
239 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
240 { 0, NULL}
241 };
242
243 #define BGP_NOTIFY_MAJOR_MSG 1
244 #define BGP_NOTIFY_MAJOR_OPEN 2
245 #define BGP_NOTIFY_MAJOR_UPDATE 3
246 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
247 #define BGP_NOTIFY_MAJOR_FSM 5
248 #define BGP_NOTIFY_MAJOR_CEASE 6
249 #define BGP_NOTIFY_MAJOR_CAP 7
250
251 static const struct tok bgp_notify_major_values[] = {
252 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
253 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
254 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
255 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
256 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
257 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
258 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"},
259 { 0, NULL}
260 };
261
262 /* draft-ietf-idr-cease-subcode-02 */
263 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
264 /* draft-ietf-idr-shutdown-07 */
265 #define BGP_NOTIFY_MINOR_CEASE_SHUT 2
266 #define BGP_NOTIFY_MINOR_CEASE_RESET 4
267 #define BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN 128
268 static const struct tok bgp_notify_minor_cease_values[] = {
269 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
270 { BGP_NOTIFY_MINOR_CEASE_SHUT, "Administrative Shutdown"},
271 { 3, "Peer Unconfigured"},
272 { BGP_NOTIFY_MINOR_CEASE_RESET, "Administrative Reset"},
273 { 5, "Connection Rejected"},
274 { 6, "Other Configuration Change"},
275 { 7, "Connection Collision Resolution"},
276 { 0, NULL}
277 };
278
279 static const struct tok bgp_notify_minor_msg_values[] = {
280 { 1, "Connection Not Synchronized"},
281 { 2, "Bad Message Length"},
282 { 3, "Bad Message Type"},
283 { 0, NULL}
284 };
285
286 static const struct tok bgp_notify_minor_open_values[] = {
287 { 1, "Unsupported Version Number"},
288 { 2, "Bad Peer AS"},
289 { 3, "Bad BGP Identifier"},
290 { 4, "Unsupported Optional Parameter"},
291 { 5, "Authentication Failure"},
292 { 6, "Unacceptable Hold Time"},
293 { 7, "Capability Message Error"},
294 { 0, NULL}
295 };
296
297 static const struct tok bgp_notify_minor_update_values[] = {
298 { 1, "Malformed Attribute List"},
299 { 2, "Unrecognized Well-known Attribute"},
300 { 3, "Missing Well-known Attribute"},
301 { 4, "Attribute Flags Error"},
302 { 5, "Attribute Length Error"},
303 { 6, "Invalid ORIGIN Attribute"},
304 { 7, "AS Routing Loop"},
305 { 8, "Invalid NEXT_HOP Attribute"},
306 { 9, "Optional Attribute Error"},
307 { 10, "Invalid Network Field"},
308 { 11, "Malformed AS_PATH"},
309 { 0, NULL}
310 };
311
312 static const struct tok bgp_notify_minor_fsm_values[] = {
313 { 0, "Unspecified Error"},
314 { 1, "In OpenSent State"},
315 { 2, "In OpenConfirm State"},
316 { 3, "In Established State"},
317 { 0, NULL }
318 };
319
320 static const struct tok bgp_notify_minor_cap_values[] = {
321 { 1, "Invalid Action Value" },
322 { 2, "Invalid Capability Length" },
323 { 3, "Malformed Capability Value" },
324 { 4, "Unsupported Capability Code" },
325 { 0, NULL }
326 };
327
328 static const struct tok bgp_origin_values[] = {
329 { 0, "IGP"},
330 { 1, "EGP"},
331 { 2, "Incomplete"},
332 { 0, NULL}
333 };
334
335 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1
336 #define BGP_PMSI_TUNNEL_LDP_P2MP 2
337 #define BGP_PMSI_TUNNEL_PIM_SSM 3
338 #define BGP_PMSI_TUNNEL_PIM_SM 4
339 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5
340 #define BGP_PMSI_TUNNEL_INGRESS 6
341 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7
342
343 static const struct tok bgp_pmsi_tunnel_values[] = {
344 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
345 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
346 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
347 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
348 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
349 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
350 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
351 { 0, NULL}
352 };
353
354 static const struct tok bgp_pmsi_flag_values[] = {
355 { 0x01, "Leaf Information required"},
356 { 0, NULL}
357 };
358
359 #define BGP_AIGP_TLV 1
360
361 static const struct tok bgp_aigp_values[] = {
362 { BGP_AIGP_TLV, "AIGP"},
363 { 0, NULL}
364 };
365
366 /* Subsequent address family identifier, RFC2283 section 7 */
367 #define SAFNUM_RES 0
368 #define SAFNUM_UNICAST 1
369 #define SAFNUM_MULTICAST 2
370 #define SAFNUM_UNIMULTICAST 3 /* deprecated now */
371 /* labeled BGP RFC3107 */
372 #define SAFNUM_LABUNICAST 4
373 /* RFC6514 */
374 #define SAFNUM_MULTICAST_VPN 5
375 /* draft-nalawade-kapoor-tunnel-safi */
376 #define SAFNUM_TUNNEL 64
377 /* RFC4761 */
378 #define SAFNUM_VPLS 65
379 /* RFC6037 */
380 #define SAFNUM_MDT 66
381 /* RFC4364 */
382 #define SAFNUM_VPNUNICAST 128
383 /* RFC6513 */
384 #define SAFNUM_VPNMULTICAST 129
385 #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */
386 /* RFC4684 */
387 #define SAFNUM_RT_ROUTING_INFO 132
388
389 #define BGP_VPN_RD_LEN 8
390
391 static const struct tok bgp_safi_values[] = {
392 { SAFNUM_RES, "Reserved"},
393 { SAFNUM_UNICAST, "Unicast"},
394 { SAFNUM_MULTICAST, "Multicast"},
395 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
396 { SAFNUM_LABUNICAST, "labeled Unicast"},
397 { SAFNUM_TUNNEL, "Tunnel"},
398 { SAFNUM_VPLS, "VPLS"},
399 { SAFNUM_MDT, "MDT"},
400 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
401 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
402 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
403 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
404 { SAFNUM_MULTICAST_VPN, "Multicast VPN"},
405 { 0, NULL }
406 };
407
408 /* well-known community */
409 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
410 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
411 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
412
413 /* Extended community type - RFC 4360 */
414 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
415 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
416 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
417 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
418 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
419 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
420 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
421 /* rfc2547 bgp-mpls-vpns */
422 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
423 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatibility */
424 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatibility */
425 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatibility */
426
427 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
428 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatibility */
429
430 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
431 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatibility */
432
433 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
434
435 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
436 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
437 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
438 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */
439
440 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */
441 #define BGP_EXT_COM_EIGRP_GEN 0x8800
442 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801
443 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
444 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803
445 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804
446 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
447
448 static const struct tok bgp_extd_comm_flag_values[] = {
449 { 0x8000, "vendor-specific"},
450 { 0x4000, "non-transitive"},
451 { 0, NULL},
452 };
453
454 static const struct tok bgp_extd_comm_subtype_values[] = {
455 { BGP_EXT_COM_RT_0, "target"},
456 { BGP_EXT_COM_RT_1, "target"},
457 { BGP_EXT_COM_RT_2, "target"},
458 { BGP_EXT_COM_RO_0, "origin"},
459 { BGP_EXT_COM_RO_1, "origin"},
460 { BGP_EXT_COM_RO_2, "origin"},
461 { BGP_EXT_COM_LINKBAND, "link-BW"},
462 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
463 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
464 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
465 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
466 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
467 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
468 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
469 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
470 { BGP_EXT_COM_L2INFO, "layer2-info"},
471 { BGP_EXT_COM_EIGRP_GEN, "eigrp-general-route (flag, tag)" },
472 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY, "eigrp-route-metric (AS, delay)" },
473 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW, "eigrp-route-metric (reliability, nexthop, bandwidth)" },
474 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU, "eigrp-route-metric (load, MTU)" },
475 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID, "eigrp-external-route (remote-AS, remote-ID)" },
476 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC, "eigrp-external-route (remote-proto, remote-metric)" },
477 { BGP_EXT_COM_SOURCE_AS, "source-AS" },
478 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
479 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
480 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
481 { 0, NULL},
482 };
483
484 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
485 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
486 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
487 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
488 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
489 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
490 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
491 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
492
493 static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
494 { BGP_OSPF_RTYPE_RTR, "Router" },
495 { BGP_OSPF_RTYPE_NET, "Network" },
496 { BGP_OSPF_RTYPE_SUM, "Summary" },
497 { BGP_OSPF_RTYPE_EXT, "External" },
498 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
499 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
500 { 0, NULL },
501 };
502
503 /* ADD-PATH Send/Receive field values */
504 static const struct tok bgp_add_path_recvsend[] = {
505 { 1, "Receive" },
506 { 2, "Send" },
507 { 3, "Both" },
508 { 0, NULL },
509 };
510
511 static char astostr[20];
512
513 /*
514 * as_printf
515 *
516 * Convert an AS number into a string and return string pointer.
517 *
518 * Depending on bflag is set or not, AS number is converted into ASDOT notation
519 * or plain number notation.
520 *
521 */
522 static char *
523 as_printf(netdissect_options *ndo,
524 char *str, size_t size, u_int asnum)
525 {
526 if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
527 nd_snprintf(str, size, "%u", asnum);
528 } else {
529 nd_snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
530 }
531 return str;
532 }
533
534 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
535
536 int
537 decode_prefix4(netdissect_options *ndo,
538 const u_char *pptr, u_int itemlen, char *buf, size_t buflen)
539 {
540 nd_ipv4 addr;
541 u_int plen, plenbytes;
542
543 ND_TCHECK_1(pptr);
544 ITEMCHECK(1);
545 plen = GET_U_1(pptr);
546 if (32 < plen)
547 return -1;
548 itemlen -= 1;
549
550 memset(&addr, 0, sizeof(addr));
551 plenbytes = (plen + 7) / 8;
552 ND_TCHECK_LEN(pptr + 1, plenbytes);
553 ITEMCHECK(plenbytes);
554 memcpy(&addr, pptr + 1, plenbytes);
555 if (plen % 8) {
556 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
557 }
558 nd_snprintf(buf, buflen, "%s/%u", ipaddr_string(ndo, (const u_char *)&addr), plen);
559 return 1 + plenbytes;
560
561 trunc:
562 return -2;
563
564 badtlv:
565 return -3;
566 }
567
568 static int
569 decode_labeled_prefix4(netdissect_options *ndo,
570 const u_char *pptr, u_int itemlen, char *buf,
571 size_t buflen)
572 {
573 nd_ipv4 addr;
574 u_int plen, plenbytes;
575
576 /* prefix length and label = 4 bytes */
577 ND_TCHECK_4(pptr);
578 ITEMCHECK(4);
579 plen = GET_U_1(pptr); /* get prefix length */
580
581 /* this is one of the weirdnesses of rfc3107
582 the label length (actually the label + COS bits)
583 is added to the prefix length;
584 we also do only read out just one label -
585 there is no real application for advertisement of
586 stacked labels in a single BGP message
587 */
588
589 if (24 > plen)
590 return -1;
591
592 plen-=24; /* adjust prefixlen - labellength */
593
594 if (32 < plen)
595 return -1;
596 itemlen -= 4;
597
598 memset(&addr, 0, sizeof(addr));
599 plenbytes = (plen + 7) / 8;
600 ND_TCHECK_LEN(pptr + 4, plenbytes);
601 ITEMCHECK(plenbytes);
602 memcpy(&addr, pptr + 4, plenbytes);
603 if (plen % 8) {
604 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
605 }
606 /* the label may get offsetted by 4 bits so lets shift it right */
607 nd_snprintf(buf, buflen, "%s/%u, label:%u %s",
608 ipaddr_string(ndo, (const u_char *)&addr),
609 plen,
610 GET_BE_U_3(pptr + 1)>>4,
611 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
612
613 return 4 + plenbytes;
614
615 trunc:
616 return -2;
617
618 badtlv:
619 return -3;
620 }
621
622 /*
623 * bgp_vpn_ip_print
624 *
625 * print an ipv4 or ipv6 address into a buffer dependend on address length.
626 */
627 static char *
628 bgp_vpn_ip_print(netdissect_options *ndo,
629 const u_char *pptr, u_int addr_length)
630 {
631
632 /* worst case string is s fully formatted v6 address */
633 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
634 char *pos = addr;
635
636 switch(addr_length) {
637 case (sizeof(nd_ipv4) << 3): /* 32 */
638 ND_TCHECK_LEN(pptr, sizeof(nd_ipv4));
639 nd_snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
640 break;
641 case (sizeof(nd_ipv6) << 3): /* 128 */
642 ND_TCHECK_LEN(pptr, sizeof(nd_ipv6));
643 nd_snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
644 break;
645 default:
646 nd_snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
647 break;
648 }
649 pos += strlen(pos);
650
651 trunc:
652 *(pos) = '\0';
653 return (addr);
654 }
655
656 /*
657 * bgp_vpn_sg_print
658 *
659 * print an multicast s,g entry into a buffer.
660 * the s,g entry is encoded like this.
661 *
662 * +-----------------------------------+
663 * | Multicast Source Length (1 octet) |
664 * +-----------------------------------+
665 * | Multicast Source (Variable) |
666 * +-----------------------------------+
667 * | Multicast Group Length (1 octet) |
668 * +-----------------------------------+
669 * | Multicast Group (Variable) |
670 * +-----------------------------------+
671 *
672 * return the number of bytes read from the wire.
673 */
674 static u_int
675 bgp_vpn_sg_print(netdissect_options *ndo,
676 const u_char *pptr, char *buf, size_t buflen)
677 {
678 uint8_t addr_length;
679 u_int total_length, offset;
680
681 total_length = 0;
682
683 /* Source address length, encoded in bits */
684 ND_TCHECK_1(pptr);
685 addr_length = GET_U_1(pptr);
686 pptr++;
687
688 /* Source address */
689 ND_TCHECK_LEN(pptr, (addr_length >> 3));
690 total_length += (addr_length >> 3) + 1;
691 offset = (u_int)strlen(buf);
692 if (addr_length) {
693 nd_snprintf(buf + offset, buflen - offset, ", Source %s",
694 bgp_vpn_ip_print(ndo, pptr, addr_length));
695 pptr += (addr_length >> 3);
696 }
697
698 /* Group address length, encoded in bits */
699 ND_TCHECK_1(pptr);
700 addr_length = GET_U_1(pptr);
701 pptr++;
702
703 /* Group address */
704 ND_TCHECK_LEN(pptr, (addr_length >> 3));
705 total_length += (addr_length >> 3) + 1;
706 offset = (u_int)strlen(buf);
707 if (addr_length) {
708 nd_snprintf(buf + offset, buflen - offset, ", Group %s",
709 bgp_vpn_ip_print(ndo, pptr, addr_length));
710 pptr += (addr_length >> 3);
711 }
712
713 trunc:
714 return (total_length);
715 }
716
717 /* Print an RFC 4364 Route Distinguisher */
718 const char *
719 bgp_vpn_rd_print(netdissect_options *ndo,
720 const u_char *pptr)
721 {
722 /* allocate space for the largest possible string */
723 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
724 char *pos = rd;
725
726 /* ok lets load the RD format */
727 switch (GET_BE_U_2(pptr)) {
728
729 case 0:
730 /* 2-byte-AS:number fmt */
731 nd_snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
732 GET_BE_U_2(pptr + 2),
733 GET_BE_U_4(pptr + 4),
734 GET_U_1(pptr + 4), GET_U_1(pptr + 5),
735 GET_U_1(pptr + 6), GET_U_1(pptr + 7));
736 break;
737
738 case 1:
739 /* IP-address:AS fmt */
740 nd_snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
741 GET_U_1(pptr + 2), GET_U_1(pptr + 3),
742 GET_U_1(pptr + 4), GET_U_1(pptr + 5),
743 GET_BE_U_2(pptr + 6));
744 break;
745
746 case 2:
747 /* 4-byte-AS:number fmt */
748 nd_snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
749 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 2)),
750 GET_BE_U_2(pptr + 6), GET_U_1(pptr + 2),
751 GET_U_1(pptr + 3), GET_U_1(pptr + 4),
752 GET_U_1(pptr + 5), GET_BE_U_2(pptr + 6));
753 break;
754 default:
755 nd_snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
756 break;
757 }
758 pos += strlen(pos);
759 *(pos) = '\0';
760 return (rd);
761 }
762
763 /*
764 * Print an RFC 4360 Extended Community.
765 */
766 static void
767 bgp_extended_community_print(netdissect_options *ndo,
768 const u_char *pptr)
769 {
770 union { /* copy buffer for bandwidth values */
771 float f;
772 uint32_t i;
773 } bw;
774
775 switch (GET_BE_U_2(pptr)) {
776
777 case BGP_EXT_COM_RT_0:
778 case BGP_EXT_COM_RO_0:
779 case BGP_EXT_COM_L2VPN_RT_0:
780 ND_PRINT("%u:%u (= %s)",
781 GET_BE_U_2(pptr + 2),
782 GET_BE_U_4(pptr + 4),
783 ipaddr_string(ndo, pptr+4));
784 break;
785
786 case BGP_EXT_COM_RT_1:
787 case BGP_EXT_COM_RO_1:
788 case BGP_EXT_COM_L2VPN_RT_1:
789 case BGP_EXT_COM_VRF_RT_IMP:
790 ND_PRINT("%s:%u",
791 ipaddr_string(ndo, pptr+2),
792 GET_BE_U_2(pptr + 6));
793 break;
794
795 case BGP_EXT_COM_RT_2:
796 case BGP_EXT_COM_RO_2:
797 ND_PRINT("%s:%u",
798 as_printf(ndo, astostr, sizeof(astostr),
799 GET_BE_U_4(pptr + 2)), GET_BE_U_2(pptr + 6));
800 break;
801
802 case BGP_EXT_COM_LINKBAND:
803 bw.i = GET_BE_U_4(pptr + 2);
804 ND_PRINT("bandwidth: %.3f Mbps",
805 bw.f*8/1000000);
806 break;
807
808 case BGP_EXT_COM_VPN_ORIGIN:
809 case BGP_EXT_COM_VPN_ORIGIN2:
810 case BGP_EXT_COM_VPN_ORIGIN3:
811 case BGP_EXT_COM_VPN_ORIGIN4:
812 case BGP_EXT_COM_OSPF_RID:
813 case BGP_EXT_COM_OSPF_RID2:
814 ND_PRINT("%s", ipaddr_string(ndo, pptr+2));
815 break;
816
817 case BGP_EXT_COM_OSPF_RTYPE:
818 case BGP_EXT_COM_OSPF_RTYPE2:
819 ND_PRINT("area:%s, router-type:%s, metric-type:%s%s",
820 ipaddr_string(ndo, pptr+2),
821 tok2str(bgp_extd_comm_ospf_rtype_values,
822 "unknown (0x%02x)",
823 GET_U_1((pptr + 6))),
824 (GET_U_1(pptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
825 ((GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_EXT) || (GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "");
826 break;
827
828 case BGP_EXT_COM_L2INFO:
829 ND_PRINT("%s Control Flags [0x%02x]:MTU %u",
830 tok2str(l2vpn_encaps_values,
831 "unknown encaps",
832 GET_U_1((pptr + 2))),
833 GET_U_1((pptr + 3)),
834 GET_BE_U_2(pptr + 4));
835 break;
836
837 case BGP_EXT_COM_SOURCE_AS:
838 ND_PRINT("AS %u", GET_BE_U_2(pptr + 2));
839 break;
840
841 default:
842 ND_PRINT("%02x%02x%02x%02x%02x%02x",
843 GET_U_1(pptr + 2),
844 GET_U_1(pptr + 3),
845 GET_U_1(pptr + 4),
846 GET_U_1(pptr + 5),
847 GET_U_1(pptr + 6),
848 GET_U_1(pptr + 7));
849 break;
850 }
851 }
852
853 /* RFC 4684 */
854 static int
855 decode_rt_routing_info(netdissect_options *ndo,
856 const u_char *pptr)
857 {
858 u_int plen;
859 char asbuf[sizeof(astostr)]; /* bgp_vpn_rd_print() overwrites astostr */
860
861 /* NLRI "prefix length" from RFC 2858 Section 4. */
862 ND_TCHECK_1(pptr);
863 plen = GET_U_1(pptr); /* get prefix length */
864
865 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
866 * RFC 4684 Section 4 defines the layout of "origin AS" and "route
867 * target" fields inside the "prefix" depending on its length.
868 */
869 if (0 == plen) {
870 /* Without "origin AS", without "route target". */
871 ND_PRINT("\n\t default route target");
872 return 1;
873 }
874
875 if (32 > plen) {
876 ND_PRINT("\n\t (illegal prefix length)");
877 return -1;
878 }
879
880 /* With at least "origin AS", possibly with "route target". */
881 ND_TCHECK_4(pptr + 1);
882 as_printf(ndo, asbuf, sizeof(asbuf), GET_BE_U_4(pptr + 1));
883
884 plen -= 32; /* adjust prefix length */
885
886 /* An extended community is 8 octets, so the remaining prefix
887 * length must be 64.
888 */
889 if (64 != plen) {
890 ND_PRINT("\n\t (illegal prefix length)");
891 return -1;
892 }
893 ND_TCHECK_LEN(pptr + 5, 8);
894 ND_PRINT("\n\t origin AS: %s, route target ", asbuf);
895 bgp_extended_community_print(ndo, pptr + 5);
896
897 return 5 + 8;
898
899 trunc:
900 return -2;
901 }
902
903 static int
904 decode_labeled_vpn_prefix4(netdissect_options *ndo,
905 const u_char *pptr, char *buf, size_t buflen)
906 {
907 nd_ipv4 addr;
908 u_int plen;
909
910 ND_TCHECK_1(pptr);
911 plen = GET_U_1(pptr); /* get prefix length */
912
913 if ((24+64) > plen)
914 return -1;
915
916 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
917
918 if (32 < plen)
919 return -1;
920
921 memset(&addr, 0, sizeof(addr));
922 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
923 memcpy(&addr, pptr + 12, (plen + 7) / 8);
924 if (plen % 8) {
925 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
926 ((0xff00 >> (plen % 8)) & 0xff);
927 }
928 /* the label may get offsetted by 4 bits so lets shift it right */
929 nd_snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
930 bgp_vpn_rd_print(ndo, pptr+4),
931 ipaddr_string(ndo, (const u_char *)&addr),
932 plen,
933 GET_BE_U_3(pptr + 1)>>4,
934 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
935
936 return 12 + (plen + 7) / 8;
937
938 trunc:
939 return -2;
940 }
941
942 /*
943 * +-------------------------------+
944 * | |
945 * | RD:IPv4-address (12 octets) |
946 * | |
947 * +-------------------------------+
948 * | MDT Group-address (4 octets) |
949 * +-------------------------------+
950 */
951
952 #define MDT_VPN_NLRI_LEN 16
953
954 static int
955 decode_mdt_vpn_nlri(netdissect_options *ndo,
956 const u_char *pptr, char *buf, size_t buflen)
957 {
958 const u_char *rd;
959 const u_char *vpn_ip;
960
961 ND_TCHECK_1(pptr);
962
963 /* if the NLRI is not predefined length, quit.*/
964 if (GET_U_1(pptr) != MDT_VPN_NLRI_LEN * 8)
965 return -1;
966 pptr++;
967
968 /* RD */
969 ND_TCHECK_8(pptr);
970 rd = pptr;
971 pptr += 8;
972
973 /* IPv4 address */
974 ND_TCHECK_LEN(pptr, sizeof(nd_ipv4));
975 vpn_ip = pptr;
976 pptr += sizeof(nd_ipv4);
977
978 /* MDT Group Address */
979 ND_TCHECK_LEN(pptr, sizeof(nd_ipv4));
980
981 nd_snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
982 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
983
984 return MDT_VPN_NLRI_LEN + 1;
985
986 trunc:
987 return -2;
988 }
989
990 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
991 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
992 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
993 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
994 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
995 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
996 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
997
998 static const struct tok bgp_multicast_vpn_route_type_values[] = {
999 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
1000 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
1001 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
1002 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
1003 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
1004 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
1005 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
1006 { 0, NULL}
1007 };
1008
1009 static int
1010 decode_multicast_vpn(netdissect_options *ndo,
1011 const u_char *pptr, char *buf, size_t buflen)
1012 {
1013 uint8_t route_type, route_length;
1014 u_int addr_length, sg_length;
1015 u_int offset;
1016
1017 ND_TCHECK_2(pptr);
1018 route_type = GET_U_1(pptr);
1019 pptr++;
1020 route_length = GET_U_1(pptr);
1021 pptr++;
1022
1023 nd_snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
1024 tok2str(bgp_multicast_vpn_route_type_values,
1025 "Unknown", route_type),
1026 route_type, route_length);
1027
1028 switch(route_type) {
1029 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
1030 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1031 offset = (u_int)strlen(buf);
1032 nd_snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
1033 bgp_vpn_rd_print(ndo, pptr),
1034 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
1035 (route_length - BGP_VPN_RD_LEN) << 3));
1036 break;
1037 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
1038 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1039 offset = (u_int)strlen(buf);
1040 nd_snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
1041 bgp_vpn_rd_print(ndo, pptr),
1042 as_printf(ndo, astostr, sizeof(astostr),
1043 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1044 break;
1045
1046 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
1047 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1048 offset = (u_int)strlen(buf);
1049 nd_snprintf(buf + offset, buflen - offset, ", RD: %s",
1050 bgp_vpn_rd_print(ndo, pptr));
1051 pptr += BGP_VPN_RD_LEN;
1052
1053 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1054 addr_length = route_length - sg_length;
1055
1056 ND_TCHECK_LEN(pptr, addr_length);
1057 offset = (u_int)strlen(buf);
1058 nd_snprintf(buf + offset, buflen - offset, ", Originator %s",
1059 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
1060 break;
1061
1062 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
1063 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1064 offset = (u_int)strlen(buf);
1065 nd_snprintf(buf + offset, buflen - offset, ", RD: %s",
1066 bgp_vpn_rd_print(ndo, pptr));
1067 pptr += BGP_VPN_RD_LEN;
1068
1069 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1070 break;
1071
1072 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
1073 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
1074 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1075 offset = (u_int)strlen(buf);
1076 nd_snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
1077 bgp_vpn_rd_print(ndo, pptr),
1078 as_printf(ndo, astostr, sizeof(astostr),
1079 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1080 pptr += BGP_VPN_RD_LEN + 4;
1081
1082 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1083 break;
1084
1085 /*
1086 * no per route-type printing yet.
1087 */
1088 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
1089 default:
1090 break;
1091 }
1092
1093 return route_length + 2;
1094
1095 trunc:
1096 return -2;
1097 }
1098
1099 /*
1100 * As I remember, some versions of systems have an snprintf() that
1101 * returns -1 if the buffer would have overflowed. If the return
1102 * value is negative, set buflen to 0, to indicate that we've filled
1103 * the buffer up.
1104 *
1105 * If the return value is greater than buflen, that means that
1106 * the buffer would have overflowed; again, set buflen to 0 in
1107 * that case.
1108 */
1109 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1110 if (stringlen<0) \
1111 buflen=0; \
1112 else if ((u_int)stringlen>buflen) \
1113 buflen=0; \
1114 else { \
1115 buflen-=stringlen; \
1116 buf+=stringlen; \
1117 }
1118
1119 static int
1120 decode_labeled_vpn_l2(netdissect_options *ndo,
1121 const u_char *pptr, char *buf, size_t buflen)
1122 {
1123 u_int plen, tlen, tlv_type, tlv_len, ttlv_len;
1124 int stringlen;
1125
1126 ND_TCHECK_2(pptr);
1127 plen = GET_BE_U_2(pptr);
1128 tlen = plen;
1129 pptr += 2;
1130 /* Old and new L2VPN NLRI share AFI/SAFI
1131 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1132 * and > 17 as old format. Complain for the middle case
1133 */
1134 if (plen == 12) {
1135 /* assume AD-only with RD, BGPNH */
1136 ND_TCHECK_LEN(pptr, 12);
1137 buf[0] = '\0';
1138 stringlen = nd_snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1139 bgp_vpn_rd_print(ndo, pptr),
1140 ipaddr_string(ndo, pptr+8));
1141 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1142 pptr += 12;
1143 tlen -= 12;
1144 return plen + 2;
1145 } else if (plen > 17) {
1146 /* assume old format */
1147 /* RD, ID, LBLKOFF, LBLBASE */
1148
1149 ND_TCHECK_LEN(pptr, 15);
1150 buf[0] = '\0';
1151 stringlen = nd_snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1152 bgp_vpn_rd_print(ndo, pptr),
1153 GET_BE_U_2(pptr + 8),
1154 GET_BE_U_2(pptr + 10),
1155 GET_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1156 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1157 pptr += 15;
1158 tlen -= 15;
1159
1160 /* ok now the variable part - lets read out TLVs*/
1161 while (tlen != 0) {
1162 if (tlen < 3) {
1163 if (buflen != 0) {
1164 stringlen=nd_snprintf(buf,buflen, "\n\t\tran past the end");
1165 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1166 }
1167 return plen + 2;
1168 }
1169 ND_TCHECK_3(pptr);
1170 tlv_type = GET_U_1(pptr);
1171 pptr++;
1172 tlv_len = GET_BE_U_2(pptr); /* length, in *bits* */
1173 ttlv_len = (tlv_len + 7)/8; /* length, in *bytes* */
1174 pptr += 2;
1175
1176 switch(tlv_type) {
1177 case 1:
1178 if (buflen != 0) {
1179 stringlen=nd_snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1180 tlv_type,
1181 tlv_len);
1182 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1183 }
1184 while (ttlv_len != 0) {
1185 if (tlen < 1) {
1186 if (buflen != 0) {
1187 stringlen=nd_snprintf(buf,buflen, " (ran past the end)");
1188 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1189 }
1190 return plen + 2;
1191 }
1192 ND_TCHECK_1(pptr);
1193 if (buflen != 0) {
1194 stringlen=nd_snprintf(buf,buflen, "%02x",
1195 GET_U_1(pptr));
1196 pptr++;
1197 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1198 }
1199 ttlv_len--;
1200 tlen--;
1201 }
1202 break;
1203 default:
1204 if (buflen != 0) {
1205 stringlen=nd_snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1206 tlv_type,
1207 tlv_len);
1208 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1209 }
1210 if (tlen < ttlv_len) {
1211 if (buflen != 0) {
1212 stringlen=nd_snprintf(buf,buflen, " (ran past the end)");
1213 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1214 }
1215 return plen + 2;
1216 }
1217 tlen -= ttlv_len;
1218 break;
1219 }
1220 }
1221 return plen + 2;
1222 } else {
1223 /* complain bitterly ? */
1224 /* fall through */
1225 goto trunc;
1226 }
1227
1228 trunc:
1229 return -2;
1230 }
1231
1232 int
1233 decode_prefix6(netdissect_options *ndo,
1234 const u_char *pd, u_int itemlen, char *buf, size_t buflen)
1235 {
1236 nd_ipv6 addr;
1237 u_int plen, plenbytes;
1238
1239 ND_TCHECK_1(pd);
1240 ITEMCHECK(1);
1241 plen = GET_U_1(pd);
1242 if (128 < plen)
1243 return -1;
1244 itemlen -= 1;
1245
1246 memset(&addr, 0, sizeof(addr));
1247 plenbytes = (plen + 7) / 8;
1248 ND_TCHECK_LEN(pd + 1, plenbytes);
1249 ITEMCHECK(plenbytes);
1250 memcpy(&addr, pd + 1, plenbytes);
1251 if (plen % 8) {
1252 addr[plenbytes - 1] &=
1253 ((0xff00 >> (plen % 8)) & 0xff);
1254 }
1255 nd_snprintf(buf, buflen, "%s/%u", ip6addr_string(ndo, (const u_char *)&addr), plen);
1256 return 1 + plenbytes;
1257
1258 trunc:
1259 return -2;
1260
1261 badtlv:
1262 return -3;
1263 }
1264
1265 static int
1266 decode_labeled_prefix6(netdissect_options *ndo,
1267 const u_char *pptr, u_int itemlen, char *buf, size_t buflen)
1268 {
1269 nd_ipv6 addr;
1270 u_int plen, plenbytes;
1271
1272 /* prefix length and label = 4 bytes */
1273 ND_TCHECK_4(pptr);
1274 ITEMCHECK(4);
1275 plen = GET_U_1(pptr); /* get prefix length */
1276
1277 if (24 > plen)
1278 return -1;
1279
1280 plen -= 24; /* adjust prefixlen - labellength */
1281
1282 if (128 < plen)
1283 return -1;
1284 itemlen -= 4;
1285
1286 memset(&addr, 0, sizeof(addr));
1287 plenbytes = (plen + 7) / 8;
1288 ND_TCHECK_LEN(pptr + 4, plenbytes);
1289 memcpy(&addr, pptr + 4, plenbytes);
1290 if (plen % 8) {
1291 addr[plenbytes - 1] &=
1292 ((0xff00 >> (plen % 8)) & 0xff);
1293 }
1294 /* the label may get offsetted by 4 bits so lets shift it right */
1295 nd_snprintf(buf, buflen, "%s/%u, label:%u %s",
1296 ip6addr_string(ndo, (const u_char *)&addr),
1297 plen,
1298 GET_BE_U_3(pptr + 1)>>4,
1299 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1300
1301 return 4 + plenbytes;
1302
1303 trunc:
1304 return -2;
1305
1306 badtlv:
1307 return -3;
1308 }
1309
1310 static int
1311 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1312 const u_char *pptr, char *buf, size_t buflen)
1313 {
1314 nd_ipv6 addr;
1315 u_int plen;
1316
1317 ND_TCHECK_1(pptr);
1318 plen = GET_U_1(pptr); /* get prefix length */
1319
1320 if ((24+64) > plen)
1321 return -1;
1322
1323 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1324
1325 if (128 < plen)
1326 return -1;
1327
1328 memset(&addr, 0, sizeof(addr));
1329 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1330 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1331 if (plen % 8) {
1332 addr[(plen + 7) / 8 - 1] &=
1333 ((0xff00 >> (plen % 8)) & 0xff);
1334 }
1335 /* the label may get offsetted by 4 bits so lets shift it right */
1336 nd_snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1337 bgp_vpn_rd_print(ndo, pptr+4),
1338 ip6addr_string(ndo, (const u_char *)&addr),
1339 plen,
1340 GET_BE_U_3(pptr + 1)>>4,
1341 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1342
1343 return 12 + (plen + 7) / 8;
1344
1345 trunc:
1346 return -2;
1347 }
1348
1349 static int
1350 decode_clnp_prefix(netdissect_options *ndo,
1351 const u_char *pptr, char *buf, size_t buflen)
1352 {
1353 uint8_t addr[19];
1354 u_int plen;
1355
1356 ND_TCHECK_1(pptr);
1357 plen = GET_U_1(pptr); /* get prefix length */
1358
1359 if (152 < plen)
1360 return -1;
1361
1362 memset(&addr, 0, sizeof(addr));
1363 ND_TCHECK_LEN(pptr + 4, (plen + 7) / 8);
1364 memcpy(&addr, pptr + 4, (plen + 7) / 8);
1365 if (plen % 8) {
1366 addr[(plen + 7) / 8 - 1] &=
1367 ((0xff00 >> (plen % 8)) & 0xff);
1368 }
1369 nd_snprintf(buf, buflen, "%s/%u",
1370 isonsap_string(ndo, addr,(plen + 7) / 8),
1371 plen);
1372
1373 return 1 + (plen + 7) / 8;
1374
1375 trunc:
1376 return -2;
1377 }
1378
1379 static int
1380 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1381 const u_char *pptr, char *buf, size_t buflen)
1382 {
1383 uint8_t addr[19];
1384 u_int plen;
1385
1386 ND_TCHECK_1(pptr);
1387 plen = GET_U_1(pptr); /* get prefix length */
1388
1389 if ((24+64) > plen)
1390 return -1;
1391
1392 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1393
1394 if (152 < plen)
1395 return -1;
1396
1397 memset(&addr, 0, sizeof(addr));
1398 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1399 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1400 if (plen % 8) {
1401 addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
1402 }
1403 /* the label may get offsetted by 4 bits so lets shift it right */
1404 nd_snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1405 bgp_vpn_rd_print(ndo, pptr+4),
1406 isonsap_string(ndo, addr,(plen + 7) / 8),
1407 plen,
1408 GET_BE_U_3(pptr + 1)>>4,
1409 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1410
1411 return 12 + (plen + 7) / 8;
1412
1413 trunc:
1414 return -2;
1415 }
1416
1417 /*
1418 * bgp_attr_get_as_size
1419 *
1420 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1421 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1422 * support, exchange AS-Path with the same path-attribute type value 0x02.
1423 */
1424 static u_int
1425 bgp_attr_get_as_size(netdissect_options *ndo,
1426 uint8_t bgpa_type, const u_char *pptr, u_int len)
1427 {
1428 const u_char *tptr = pptr;
1429
1430 /*
1431 * If the path attribute is the optional AS4 path type, then we already
1432 * know, that ASs must be encoded in 4 byte format.
1433 */
1434 if (bgpa_type == BGPTYPE_AS4_PATH) {
1435 return 4;
1436 }
1437
1438 /*
1439 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1440 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1441 * each.
1442 */
1443 while (tptr < pptr + len) {
1444 ND_TCHECK_1(tptr);
1445
1446 /*
1447 * If we do not find a valid segment type, our guess might be wrong.
1448 */
1449 if (GET_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || GET_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
1450 goto trunc;
1451 }
1452 ND_TCHECK_1(tptr + 1);
1453 tptr += 2 + GET_U_1(tptr + 1) * 2;
1454 }
1455
1456 /*
1457 * If we correctly reached end of the AS path attribute data content,
1458 * then most likely ASs were indeed encoded as 2 bytes.
1459 */
1460 if (tptr == pptr + len) {
1461 return 2;
1462 }
1463
1464 trunc:
1465
1466 /*
1467 * We can come here, either we did not have enough data, or if we
1468 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1469 * so that calller can try to decode each AS as of 4 bytes. If indeed
1470 * there was not enough data, it will crib and end the parse anyways.
1471 */
1472 return 4;
1473 }
1474
1475 /*
1476 * The only way to know that a BGP UPDATE message is using add path is
1477 * by checking if the capability is in the OPEN message which we may have missed.
1478 * So this function checks if it is possible that the update could contain add path
1479 * and if so it checks that standard BGP doesn't make sense.
1480 */
1481 static int
1482 check_add_path(netdissect_options *ndo, const u_char *pptr, u_int length,
1483 u_int max_prefix_length)
1484 {
1485 u_int offset, prefix_length;
1486
1487 if (length < 5) {
1488 return 0;
1489 }
1490
1491 /*
1492 * Scan through the NLRI information under the assumpetion that
1493 * it doesn't have path IDs.
1494 */
1495 for (offset = 0; offset < length;) {
1496 offset += 4;
1497 if (!ND_TTEST_1(pptr + offset)) {
1498 /* We ran out of captured data; quit scanning. */
1499 break;
1500 }
1501 prefix_length = GET_U_1(pptr + offset);
1502 /*
1503 * Add 4 to cover the path id
1504 * and check the prefix length isn't greater than 32/128.
1505 */
1506 if (prefix_length > max_prefix_length) {
1507 return 0;
1508 }
1509 /* Add 1 for the prefix_length byte and prefix_length to cover the address */
1510 offset += 1 + ((prefix_length + 7) / 8);
1511 }
1512 /* check we haven't gone past the end of the section */
1513 if (offset > length) {
1514 return 0;
1515 }
1516
1517 /* check it's not standard BGP */
1518 for (offset = 0; offset < length; ) {
1519 if (!ND_TTEST_1(pptr + offset)) {
1520 /* We ran out of captured data; quit scanning. */
1521 break;
1522 }
1523 prefix_length = GET_U_1(pptr + offset);
1524 /*
1525 * If the prefix_length is zero (0.0.0.0/0)
1526 * and since it's not the only address (length >= 5)
1527 * then it is add-path
1528 */
1529 if (prefix_length < 1 || prefix_length > max_prefix_length) {
1530 return 1;
1531 }
1532 offset += 1 + ((prefix_length + 7) / 8);
1533 }
1534 if (offset > length) {
1535 return 1;
1536 }
1537
1538 /* assume not add-path by default */
1539 return 0;
1540 }
1541
1542 static int
1543 bgp_mp_af_print(netdissect_options *ndo,
1544 const u_char *tptr, u_int tlen,
1545 uint16_t *afp, uint8_t *safip)
1546 {
1547 uint16_t af;
1548 uint8_t safi;
1549
1550 af = GET_BE_U_2(tptr);
1551 *afp = af;
1552 safi = GET_U_1(tptr + 2);
1553 *safip = safi;
1554
1555 ND_PRINT("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1556 tok2str(af_values, "Unknown AFI", af),
1557 af,
1558 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1559 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1560 safi);
1561
1562 switch(af<<8 | safi) {
1563 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1564 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1565 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1566 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1567 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1568 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1569 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1570 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1571 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1572 case (AFNUM_INET<<8 | SAFNUM_MDT):
1573 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1574 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1575 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1576 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1577 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1578 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1579 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1580 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1581 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1582 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1583 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1584 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1585 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1586 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1587 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1588 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1589 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1590 break;
1591 default:
1592 ND_TCHECK_LEN(tptr, tlen);
1593 ND_PRINT("\n\t no AFI %u / SAFI %u decoder", af, safi);
1594 if (ndo->ndo_vflag <= 1)
1595 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1596 return -1;
1597 }
1598 return 0;
1599 trunc:
1600 return -2;
1601 }
1602
1603 static int
1604 bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi,
1605 const u_char *tptr, u_int len,
1606 char *buf, size_t buflen,
1607 int add_path4, int add_path6)
1608 {
1609 int advance;
1610 u_int path_id = 0;
1611
1612 switch (af<<8 | safi) {
1613 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1614 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1615 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1616 if (add_path4) {
1617 path_id = GET_BE_U_4(tptr);
1618 tptr += 4;
1619 }
1620 advance = decode_prefix4(ndo, tptr, len, buf, buflen);
1621 if (advance == -1)
1622 ND_PRINT("\n\t (illegal prefix length)");
1623 else if (advance == -2)
1624 goto trunc;
1625 else if (advance == -3)
1626 break; /* bytes left, but not enough */
1627 else
1628 ND_PRINT("\n\t %s", buf);
1629 if (add_path4) {
1630 ND_PRINT(" Path Id: %u", path_id);
1631 advance += 4;
1632 }
1633 break;
1634 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1635 advance = decode_labeled_prefix4(ndo, tptr, len, buf, buflen);
1636 if (advance == -1)
1637 ND_PRINT("\n\t (illegal prefix length)");
1638 else if (advance == -2)
1639 goto trunc;
1640 else if (advance == -3)
1641 break; /* bytes left, but not enough */
1642 else
1643 ND_PRINT("\n\t %s", buf);
1644 break;
1645 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1646 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1647 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1648 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, buflen);
1649 if (advance == -1)
1650 ND_PRINT("\n\t (illegal prefix length)");
1651 else if (advance == -2)
1652 goto trunc;
1653 else
1654 ND_PRINT("\n\t %s", buf);
1655 break;
1656 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1657 advance = decode_rt_routing_info(ndo, tptr);
1658 if (advance == -2)
1659 goto trunc;
1660 break;
1661 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1662 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1663 advance = decode_multicast_vpn(ndo, tptr, buf, buflen);
1664 if (advance == -1)
1665 ND_PRINT("\n\t (illegal prefix length)");
1666 else if (advance == -2)
1667 goto trunc;
1668 else
1669 ND_PRINT("\n\t %s", buf);
1670 break;
1671
1672 case (AFNUM_INET<<8 | SAFNUM_MDT):
1673 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, buflen);
1674 if (advance == -1)
1675 ND_PRINT("\n\t (illegal prefix length)");
1676 else if (advance == -2)
1677 goto trunc;
1678 else
1679 ND_PRINT("\n\t %s", buf);
1680 break;
1681 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1682 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1683 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1684 if (add_path6) {
1685 path_id = GET_BE_U_4(tptr);
1686 tptr += 4;
1687 }
1688 advance = decode_prefix6(ndo, tptr, len, buf, buflen);
1689 if (advance == -1)
1690 ND_PRINT("\n\t (illegal prefix length)");
1691 else if (advance == -2)
1692 goto trunc;
1693 else if (advance == -3)
1694 break; /* bytes left, but not enough */
1695 else
1696 ND_PRINT("\n\t %s", buf);
1697 if (add_path6) {
1698 ND_PRINT(" Path Id: %u", path_id);
1699 advance += 4;
1700 }
1701 break;
1702 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1703 advance = decode_labeled_prefix6(ndo, tptr, len, buf, buflen);
1704 if (advance == -1)
1705 ND_PRINT("\n\t (illegal prefix length)");
1706 else if (advance == -2)
1707 goto trunc;
1708 else if (advance == -3)
1709 break; /* bytes left, but not enough */
1710 else
1711 ND_PRINT("\n\t %s", buf);
1712 break;
1713 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1714 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1715 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1716 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, buflen);
1717 if (advance == -1)
1718 ND_PRINT("\n\t (illegal prefix length)");
1719 else if (advance == -2)
1720 goto trunc;
1721 else
1722 ND_PRINT("\n\t %s", buf);
1723 break;
1724 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1725 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1726 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1727 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1728 advance = decode_labeled_vpn_l2(ndo, tptr, buf, buflen);
1729 if (advance == -1)
1730 ND_PRINT("\n\t (illegal length)");
1731 else if (advance == -2)
1732 goto trunc;
1733 else
1734 ND_PRINT("\n\t %s", buf);
1735 break;
1736 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1737 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1738 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1739 advance = decode_clnp_prefix(ndo, tptr, buf, buflen);
1740 if (advance == -1)
1741 ND_PRINT("\n\t (illegal prefix length)");
1742 else if (advance == -2)
1743 goto trunc;
1744 else
1745 ND_PRINT("\n\t %s", buf);
1746 break;
1747 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1748 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1749 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1750 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, buflen);
1751 if (advance == -1)
1752 ND_PRINT("\n\t (illegal prefix length)");
1753 else if (advance == -2)
1754 goto trunc;
1755 else
1756 ND_PRINT("\n\t %s", buf);
1757 break;
1758 default:
1759 /*
1760 * This should not happen, we should have been protected
1761 * by bgp_mp_af_print()'s return value.
1762 */
1763 ND_PRINT("\n\t ERROR: no AFI %u / SAFI %u decoder", af, safi);
1764 advance = -4;
1765 break;
1766 }
1767 return advance;
1768 trunc: /* we rely on the caller to recognize -2 return value */
1769 return -2;
1770 }
1771
1772 static int
1773 bgp_attr_print(netdissect_options *ndo,
1774 uint8_t atype, const u_char *pptr, u_int len)
1775 {
1776 u_int i;
1777 uint16_t af;
1778 uint8_t safi, snpa, nhlen;
1779 int advance;
1780 u_int tlen;
1781 const u_char *tptr;
1782 char buf[MAXHOSTNAMELEN + 100];
1783 u_int as_size;
1784 int add_path4, add_path6;
1785 int ret;
1786
1787 tptr = pptr;
1788 tlen = len;
1789
1790 switch (atype) {
1791 case BGPTYPE_ORIGIN:
1792 if (len != 1)
1793 ND_PRINT("invalid len");
1794 else {
1795 ND_TCHECK_1(tptr);
1796 ND_PRINT("%s", tok2str(bgp_origin_values,
1797 "Unknown Origin Typecode",
1798 GET_U_1(tptr)));
1799 }
1800 break;
1801
1802 /*
1803 * Process AS4 byte path and AS2 byte path attributes here.
1804 */
1805 case BGPTYPE_AS4_PATH:
1806 case BGPTYPE_AS_PATH:
1807 if (len % 2) {
1808 ND_PRINT("invalid len");
1809 break;
1810 }
1811 if (!len) {
1812 ND_PRINT("empty");
1813 break;
1814 }
1815
1816 /*
1817 * BGP updates exchanged between New speakers that support 4
1818 * byte AS, ASs are always encoded in 4 bytes. There is no
1819 * definitive way to find this, just by the packet's
1820 * contents. So, check for packet's TLV's sanity assuming
1821 * 2 bytes first, and it does not pass, assume that ASs are
1822 * encoded in 4 bytes format and move on.
1823 */
1824 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1825
1826 while (tptr < pptr + len) {
1827 ND_TCHECK_1(tptr);
1828 ND_PRINT("%s", tok2str(bgp_as_path_segment_open_values,
1829 "?", GET_U_1(tptr)));
1830 ND_TCHECK_1(tptr + 1);
1831 for (i = 0; i < GET_U_1(tptr + 1) * as_size; i += as_size) {
1832 ND_TCHECK_LEN(tptr + 2 + i, as_size);
1833 ND_PRINT("%s ",
1834 as_printf(ndo, astostr, sizeof(astostr),
1835 as_size == 2 ?
1836 GET_BE_U_2(tptr + i + 2) :
1837 GET_BE_U_4(tptr + i + 2)));
1838 }
1839 ND_TCHECK_1(tptr);
1840 ND_PRINT("%s", tok2str(bgp_as_path_segment_close_values,
1841 "?", GET_U_1(tptr)));
1842 ND_TCHECK_1(tptr + 1);
1843 tptr += 2 + GET_U_1(tptr + 1) * as_size;
1844 }
1845 break;
1846 case BGPTYPE_NEXT_HOP:
1847 if (len != 4)
1848 ND_PRINT("invalid len");
1849 else {
1850 ND_TCHECK_4(tptr);
1851 ND_PRINT("%s", ipaddr_string(ndo, tptr));
1852 }
1853 break;
1854 case BGPTYPE_MULTI_EXIT_DISC:
1855 case BGPTYPE_LOCAL_PREF:
1856 if (len != 4)
1857 ND_PRINT("invalid len");
1858 else {
1859 ND_TCHECK_4(tptr);
1860 ND_PRINT("%u", GET_BE_U_4(tptr));
1861 }
1862 break;
1863 case BGPTYPE_ATOMIC_AGGREGATE:
1864 if (len != 0)
1865 ND_PRINT("invalid len");
1866 break;
1867 case BGPTYPE_AGGREGATOR:
1868
1869 /*
1870 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1871 * the length of this PA can be either 6 bytes or 8 bytes.
1872 */
1873 if (len != 6 && len != 8) {
1874 ND_PRINT("invalid len");
1875 break;
1876 }
1877 ND_TCHECK_LEN(tptr, len);
1878 if (len == 6) {
1879 ND_PRINT(" AS #%s, origin %s",
1880 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(tptr)),
1881 ipaddr_string(ndo, tptr + 2));
1882 } else {
1883 ND_PRINT(" AS #%s, origin %s",
1884 as_printf(ndo, astostr, sizeof(astostr),
1885 GET_BE_U_4(tptr)), ipaddr_string(ndo, tptr + 4));
1886 }
1887 break;
1888 case BGPTYPE_AGGREGATOR4:
1889 if (len != 8) {
1890 ND_PRINT("invalid len");
1891 break;
1892 }
1893 ND_TCHECK_8(tptr);
1894 ND_PRINT(" AS #%s, origin %s",
1895 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)),
1896 ipaddr_string(ndo, tptr + 4));
1897 break;
1898 case BGPTYPE_COMMUNITIES:
1899 if (len % 4) {
1900 ND_PRINT("invalid len");
1901 break;
1902 }
1903 while (tlen != 0) {
1904 uint32_t comm;
1905 ND_TCHECK_4(tptr);
1906 if (tlen < 4)
1907 goto trunc;
1908 comm = GET_BE_U_4(tptr);
1909 switch (comm) {
1910 case BGP_COMMUNITY_NO_EXPORT:
1911 ND_PRINT(" NO_EXPORT");
1912 break;
1913 case BGP_COMMUNITY_NO_ADVERT:
1914 ND_PRINT(" NO_ADVERTISE");
1915 break;
1916 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1917 ND_PRINT(" NO_EXPORT_SUBCONFED");
1918 break;
1919 default:
1920 ND_PRINT("%u:%u%s",
1921 (comm >> 16) & 0xffff,
1922 comm & 0xffff,
1923 (tlen>4) ? ", " : "");
1924 break;
1925 }
1926 tlen -=4;
1927 tptr +=4;
1928 }
1929 break;
1930 case BGPTYPE_ORIGINATOR_ID:
1931 if (len != 4) {
1932 ND_PRINT("invalid len");
1933 break;
1934 }
1935 ND_TCHECK_4(tptr);
1936 ND_PRINT("%s",ipaddr_string(ndo, tptr));
1937 break;
1938 case BGPTYPE_CLUSTER_LIST:
1939 if (len % 4) {
1940 ND_PRINT("invalid len");
1941 break;
1942 }
1943 while (tlen != 0) {
1944 ND_TCHECK_4(tptr);
1945 if (tlen < 4)
1946 goto trunc;
1947 ND_PRINT("%s%s",
1948 ipaddr_string(ndo, tptr),
1949 (tlen>4) ? ", " : "");
1950 tlen -=4;
1951 tptr +=4;
1952 }
1953 break;
1954 case BGPTYPE_MP_REACH_NLRI:
1955 ND_TCHECK_3(tptr);
1956 if (tlen < 3)
1957 goto trunc;
1958 ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
1959 if (ret == -2)
1960 goto trunc;
1961 if (ret < 0)
1962 break;
1963
1964 tptr +=3;
1965
1966 ND_TCHECK_1(tptr);
1967 nhlen = GET_U_1(tptr);
1968 tlen = nhlen;
1969 tptr++;
1970
1971 if (tlen) {
1972 u_int nnh = 0;
1973 ND_PRINT("\n\t nexthop: ");
1974 while (tlen != 0) {
1975 if (nnh++ > 0) {
1976 ND_PRINT(", " );
1977 }
1978 switch(af<<8 | safi) {
1979 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1980 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1981 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1982 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1983 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1984 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1985 case (AFNUM_INET<<8 | SAFNUM_MDT):
1986 if (tlen < sizeof(nd_ipv4)) {
1987 ND_PRINT("invalid len");
1988 tlen = 0;
1989 } else {
1990 ND_TCHECK_LEN(tptr, sizeof(nd_ipv4));
1991 ND_PRINT("%s",ipaddr_string(ndo, tptr));
1992 tlen -= sizeof(nd_ipv4);
1993 tptr += sizeof(nd_ipv4);
1994 }
1995 break;
1996 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1997 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1998 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1999 if (tlen < sizeof(nd_ipv4)+BGP_VPN_RD_LEN) {
2000 ND_PRINT("invalid len");
2001 tlen = 0;
2002 } else {
2003 ND_TCHECK_LEN(tptr,
2004 sizeof(nd_ipv4) + BGP_VPN_RD_LEN);
2005 ND_PRINT("RD: %s, %s",
2006 bgp_vpn_rd_print(ndo, tptr),
2007 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN));
2008 tlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2009 tptr += (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2010 }
2011 break;
2012 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
2013 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
2014 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
2015 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
2016 if (tlen < sizeof(nd_ipv6)) {
2017 ND_PRINT("invalid len");
2018 tlen = 0;
2019 } else {
2020 ND_TCHECK_LEN(tptr, sizeof(nd_ipv6));
2021 ND_PRINT("%s", ip6addr_string(ndo, tptr));
2022 tlen -= sizeof(nd_ipv6);
2023 tptr += sizeof(nd_ipv6);
2024 }
2025 break;
2026 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
2027 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
2028 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
2029 if (tlen < sizeof(nd_ipv6)+BGP_VPN_RD_LEN) {
2030 ND_PRINT("invalid len");
2031 tlen = 0;
2032 } else {
2033 ND_TCHECK_LEN(tptr,
2034 sizeof(nd_ipv6) + BGP_VPN_RD_LEN);
2035 ND_PRINT("RD: %s, %s",
2036 bgp_vpn_rd_print(ndo, tptr),
2037 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN));
2038 tlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2039 tptr += (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2040 }
2041 break;
2042 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
2043 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2044 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2045 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2046 if (tlen < sizeof(nd_ipv4)) {
2047 ND_PRINT("invalid len");
2048 tlen = 0;
2049 } else {
2050 ND_TCHECK_LEN(tptr, sizeof(nd_ipv4));
2051 ND_PRINT("%s", ipaddr_string(ndo, tptr));
2052 tlen -= (sizeof(nd_ipv4));
2053 tptr += (sizeof(nd_ipv4));
2054 }
2055 break;
2056 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2057 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2058 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2059 ND_TCHECK_LEN(tptr, tlen);
2060 ND_PRINT("%s", isonsap_string(ndo, tptr, tlen));
2061 tptr += tlen;
2062 tlen = 0;
2063 break;
2064
2065 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2066 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2067 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2068 if (tlen < BGP_VPN_RD_LEN+1) {
2069 ND_PRINT("invalid len");
2070 tlen = 0;
2071 } else {
2072 ND_TCHECK_LEN(tptr, tlen);
2073 ND_PRINT("RD: %s, %s",
2074 bgp_vpn_rd_print(ndo, tptr),
2075 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN));
2076 /* rfc986 mapped IPv4 address ? */
2077 if (GET_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
2078 ND_PRINT(" = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4));
2079 /* rfc1888 mapped IPv6 address ? */
2080 else if (GET_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
2081 ND_PRINT(" = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3));
2082 tptr += tlen;
2083 tlen = 0;
2084 }
2085 break;
2086 default:
2087 /*
2088 * bgp_mp_af_print() should have saved us from
2089 * an unsupported AFI/SAFI.
2090 */
2091 ND_PRINT("ERROR: no AFI %u/SAFI %u nexthop decoder", af, safi);
2092 tptr += tlen;
2093 tlen = 0;
2094 goto done;
2095 break;
2096 }
2097 }
2098 }
2099 ND_PRINT(", nh-length: %u", nhlen);
2100 tptr += tlen;
2101
2102 ND_TCHECK_1(tptr);
2103 snpa = GET_U_1(tptr);
2104 tptr++;
2105
2106 if (snpa) {
2107 ND_PRINT("\n\t %u SNPA", snpa);
2108 for (/*nothing*/; snpa != 0; snpa--) {
2109 ND_TCHECK_1(tptr);
2110 ND_PRINT("\n\t %u bytes", GET_U_1(tptr));
2111 tptr += GET_U_1(tptr) + 1;
2112 }
2113 } else {
2114 ND_PRINT(", no SNPA");
2115 }
2116
2117 add_path4 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 32);
2118 add_path6 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 128);
2119
2120 while (tptr < pptr + len) {
2121 advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf),
2122 add_path4, add_path6);
2123 if (advance == -2)
2124 goto trunc;
2125 if (advance < 0)
2126 break;
2127 tptr += advance;
2128 }
2129 break;
2130
2131 case BGPTYPE_MP_UNREACH_NLRI:
2132 ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
2133 ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
2134 if (ret == -2)
2135 goto trunc;
2136 if (ret < 0)
2137 break;
2138
2139 if (len == BGP_MP_NLRI_MINSIZE)
2140 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2141
2142 tptr += 3;
2143
2144 add_path4 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 32);
2145 add_path6 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 128);
2146
2147 while (tptr < pptr + len) {
2148 advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf),
2149 add_path4, add_path6);
2150 if (advance == -2)
2151 goto trunc;
2152 if (advance < 0)
2153 break;
2154 tptr += advance;
2155 }
2156 break;
2157 case BGPTYPE_EXTD_COMMUNITIES:
2158 if (len % 8) {
2159 ND_PRINT("invalid len");
2160 break;
2161 }
2162 while (tlen != 0) {
2163 uint16_t extd_comm;
2164
2165 ND_TCHECK_2(tptr);
2166 if (tlen < 2)
2167 goto trunc;
2168 extd_comm=GET_BE_U_2(tptr);
2169
2170 ND_PRINT("\n\t %s (0x%04x), Flags [%s]",
2171 tok2str(bgp_extd_comm_subtype_values,
2172 "unknown extd community typecode",
2173 extd_comm),
2174 extd_comm,
2175 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm));
2176
2177 ND_TCHECK_8(tptr);
2178 if (tlen < 8)
2179 goto trunc;
2180 ND_PRINT(": ");
2181 bgp_extended_community_print(ndo, tptr);
2182 tlen -= 8;
2183 tptr += 8;
2184 }
2185 break;
2186
2187 case BGPTYPE_PMSI_TUNNEL:
2188 {
2189 uint8_t tunnel_type, flags;
2190
2191 ND_TCHECK_5(tptr);
2192 if (tlen < 5)
2193 goto trunc;
2194 flags = GET_U_1(tptr);
2195 tunnel_type = GET_U_1(tptr + 1);
2196 tlen = len;
2197
2198 ND_PRINT("\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2199 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2200 tunnel_type,
2201 bittok2str(bgp_pmsi_flag_values, "none", flags),
2202 GET_BE_U_3(tptr + 2)>>4);
2203
2204 tptr +=5;
2205 tlen -= 5;
2206
2207 switch (tunnel_type) {
2208 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2209 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2210 ND_TCHECK_8(tptr);
2211 ND_PRINT("\n\t Sender %s, P-Group %s",
2212 ipaddr_string(ndo, tptr),
2213 ipaddr_string(ndo, tptr+4));
2214 break;
2215
2216 case BGP_PMSI_TUNNEL_PIM_SSM:
2217 ND_TCHECK_8(tptr);
2218 ND_PRINT("\n\t Root-Node %s, P-Group %s",
2219 ipaddr_string(ndo, tptr),
2220 ipaddr_string(ndo, tptr+4));
2221 break;
2222 case BGP_PMSI_TUNNEL_INGRESS:
2223 ND_TCHECK_4(tptr);
2224 ND_PRINT("\n\t Tunnel-Endpoint %s",
2225 ipaddr_string(ndo, tptr));
2226 break;
2227 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2228 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2229 ND_TCHECK_8(tptr);
2230 ND_PRINT("\n\t Root-Node %s, LSP-ID 0x%08x",
2231 ipaddr_string(ndo, tptr),
2232 GET_BE_U_4(tptr + 4));
2233 break;
2234 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2235 ND_TCHECK_8(tptr);
2236 ND_PRINT("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2237 ipaddr_string(ndo, tptr),
2238 GET_BE_U_4(tptr + 4));
2239 break;
2240 default:
2241 if (ndo->ndo_vflag <= 1) {
2242 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2243 }
2244 }
2245 break;
2246 }
2247 case BGPTYPE_AIGP:
2248 {
2249 uint8_t type;
2250 uint16_t length;
2251
2252 tlen = len;
2253
2254 while (tlen >= 3) {
2255
2256 ND_TCHECK_3(tptr);
2257
2258 type = GET_U_1(tptr);
2259 length = GET_BE_U_2(tptr + 1);
2260 tptr += 3;
2261 tlen -= 3;
2262
2263 ND_PRINT("\n\t %s TLV (%u), length %u",
2264 tok2str(bgp_aigp_values, "Unknown", type),
2265 type, length);
2266
2267 if (length < 3)
2268 goto trunc;
2269 length -= 3;
2270
2271 /*
2272 * Check if we can read the TLV data.
2273 */
2274 ND_TCHECK_LEN(tptr + 3, length);
2275 if (tlen < length)
2276 goto trunc;
2277
2278 switch (type) {
2279
2280 case BGP_AIGP_TLV:
2281 if (length < 8)
2282 goto trunc;
2283 ND_PRINT(", metric %" PRIu64,
2284 GET_BE_U_8(tptr));
2285 break;
2286
2287 default:
2288 if (ndo->ndo_vflag <= 1) {
2289 print_unknown_data(ndo, tptr,"\n\t ", length);
2290 }
2291 }
2292
2293 tptr += length;
2294 tlen -= length;
2295 }
2296 break;
2297 }
2298 case BGPTYPE_ATTR_SET:
2299 ND_TCHECK_4(tptr);
2300 if (len < 4)
2301 goto trunc;
2302 ND_PRINT("\n\t Origin AS: %s",
2303 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)));
2304 tptr += 4;
2305 len -= 4;
2306
2307 while (len) {
2308 u_int aflags, alenlen, alen;
2309
2310 ND_TCHECK_2(tptr);
2311 if (len < 2) {
2312 ND_PRINT(" [path attr too short]");
2313 tptr += len;
2314 break;
2315 }
2316 aflags = GET_U_1(tptr);
2317 atype = GET_U_1(tptr + 1);
2318 tptr += 2;
2319 len -= 2;
2320 alenlen = bgp_attr_lenlen(aflags, tptr);
2321 ND_TCHECK_LEN(tptr, alenlen);
2322 if (len < alenlen) {
2323 ND_PRINT(" [path attr too short]");
2324 tptr += len;
2325 break;
2326 }
2327 alen = bgp_attr_len(aflags, tptr);
2328 tptr += alenlen;
2329 len -= alenlen;
2330
2331 ND_PRINT("\n\t %s (%u), length: %u",
2332 tok2str(bgp_attr_values,
2333 "Unknown Attribute", atype),
2334 atype,
2335 alen);
2336
2337 if (aflags) {
2338 ND_PRINT(", Flags [%s%s%s%s",
2339 aflags & 0x80 ? "O" : "",
2340 aflags & 0x40 ? "T" : "",
2341 aflags & 0x20 ? "P" : "",
2342 aflags & 0x10 ? "E" : "");
2343 if (aflags & 0xf)
2344 ND_PRINT("+%x", aflags & 0xf);
2345 ND_PRINT("]");
2346 }
2347 ND_PRINT(": ");
2348 if (len < alen) {
2349 ND_PRINT(" [path attr too short]");
2350 tptr += len;
2351 break;
2352 }
2353 /* FIXME check for recursion */
2354 if (!bgp_attr_print(ndo, atype, tptr, alen))
2355 return 0;
2356 tptr += alen;
2357 len -= alen;
2358 }
2359 break;
2360
2361 case BGPTYPE_LARGE_COMMUNITY:
2362 if (len == 0 || len % 12) {
2363 ND_PRINT("invalid len");
2364 break;
2365 }
2366 ND_PRINT("\n\t ");
2367 while (len != 0) {
2368 ND_TCHECK_LEN(tptr, 12);
2369 ND_PRINT("%u:%u:%u%s",
2370 GET_BE_U_4(tptr),
2371 GET_BE_U_4(tptr + 4),
2372 GET_BE_U_4(tptr + 8),
2373 (len > 12) ? ", " : "");
2374 tptr += 12;
2375 /*
2376 * len will always be a multiple of 12, as per the above,
2377 * so this will never underflow.
2378 */
2379 len -= 12;
2380 }
2381 break;
2382 default:
2383 ND_TCHECK_LEN(pptr, len);
2384 ND_PRINT("\n\t no Attribute %u decoder", atype); /* we have no decoder for the attribute */
2385 if (ndo->ndo_vflag <= 1)
2386 print_unknown_data(ndo, pptr, "\n\t ", len);
2387 break;
2388 }
2389 done:
2390 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2391 ND_TCHECK_LEN(pptr, len);
2392 print_unknown_data(ndo, pptr, "\n\t ", len);
2393 }
2394 return 1;
2395
2396 trunc:
2397 return 0;
2398 }
2399
2400 static void
2401 bgp_capabilities_print(netdissect_options *ndo,
2402 const u_char *opt, u_int caps_len)
2403 {
2404 u_int cap_type, cap_len, tcap_len, cap_offset;
2405 u_int i = 0;
2406
2407 while (i < caps_len) {
2408 ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
2409 cap_type=GET_U_1(opt + i);
2410 cap_len=GET_U_1(opt + i + 1);
2411 ND_PRINT("\n\t %s (%u), length: %u",
2412 tok2str(bgp_capcode_values, "Unknown", cap_type),
2413 cap_type,
2414 cap_len);
2415 ND_TCHECK_LEN(opt + 2 + i, cap_len);
2416 switch (cap_type) {
2417 case BGP_CAPCODE_MP:
2418 /* AFI (16 bits), Reserved (8 bits), SAFI (8 bits) */
2419 if (cap_len < 4) {
2420 ND_PRINT(" (too short, < 4)");
2421 return;
2422 }
2423 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u)",
2424 tok2str(af_values, "Unknown", GET_BE_U_2(opt + i + 2)),
2425 GET_BE_U_2(opt + i + 2),
2426 tok2str(bgp_safi_values, "Unknown", GET_U_1(opt + i + 5)),
2427 GET_U_1(opt + i + 5));
2428 break;
2429 case BGP_CAPCODE_RESTART:
2430 /* Restart Flags (4 bits), Restart Time in seconds (12 bits) */
2431 if (cap_len < 2) {
2432 ND_PRINT(" (too short, < 2)");
2433 return;
2434 }
2435 tcap_len=cap_len;
2436 ND_PRINT("\n\t\tRestart Flags: [%s], Restart Time %us",
2437 ((GET_U_1(opt + i + 2))&0x80) ? "R" : "none",
2438 GET_BE_U_2(opt + i + 2)&0xfff);
2439 tcap_len-=2;
2440 cap_offset=4;
2441 while(tcap_len>=4) {
2442 ND_PRINT("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2443 tok2str(af_values,"Unknown",
2444 GET_BE_U_2(opt + i + cap_offset)),
2445 GET_BE_U_2(opt + i + cap_offset),
2446 tok2str(bgp_safi_values,"Unknown",
2447 GET_U_1(opt + i + cap_offset + 2)),
2448 GET_U_1(opt + (i + cap_offset + 2)),
2449 ((GET_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" );
2450 tcap_len -= 4;
2451 cap_offset += 4;
2452 }
2453 break;
2454 case BGP_CAPCODE_RR:
2455 case BGP_CAPCODE_RR_CISCO:
2456 break;
2457 case BGP_CAPCODE_AS_NEW:
2458 /*
2459 * Extract the 4 byte AS number encoded.
2460 */
2461 if (cap_len < 4) {
2462 ND_PRINT(" (too short, < 4)");
2463 return;
2464 }
2465 ND_PRINT("\n\t\t 4 Byte AS %s",
2466 as_printf(ndo, astostr, sizeof(astostr),
2467 GET_BE_U_4(opt + i + 2)));
2468 break;
2469 case BGP_CAPCODE_ADD_PATH:
2470 if (cap_len == 0) {
2471 ND_PRINT(" (bogus)"); /* length */
2472 break;
2473 }
2474 tcap_len=cap_len;
2475 cap_offset=2;
2476 while (tcap_len != 0) {
2477 if (tcap_len < 4) {
2478 nd_print_invalid(ndo);
2479 break;
2480 }
2481 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2482 tok2str(af_values,"Unknown",GET_BE_U_2(opt + i + cap_offset)),
2483 GET_BE_U_2(opt + i + cap_offset),
2484 tok2str(bgp_safi_values,"Unknown",GET_U_1(opt + i + cap_offset + 2)),
2485 GET_U_1(opt + (i + cap_offset + 2)),
2486 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",GET_U_1(opt + i + cap_offset + 3))
2487 );
2488 tcap_len -= 4;
2489 cap_offset += 4;
2490 }
2491 break;
2492 default:
2493 ND_PRINT("\n\t\tno decoder for Capability %u",
2494 cap_type);
2495 if (ndo->ndo_vflag <= 1)
2496 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2497 cap_len);
2498 break;
2499 }
2500 if (ndo->ndo_vflag > 1 && cap_len != 0) {
2501 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2502 }
2503 i += BGP_CAP_HEADER_SIZE + cap_len;
2504 }
2505 return;
2506
2507 trunc:
2508 nd_print_trunc(ndo);
2509 }
2510
2511 static void
2512 bgp_open_print(netdissect_options *ndo,
2513 const u_char *dat, u_int length)
2514 {
2515 const struct bgp_open *bgp_open_header;
2516 u_int optslen;
2517 const struct bgp_opt *bgpopt;
2518 const u_char *opt;
2519 u_int i;
2520
2521 ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
2522 if (length < BGP_OPEN_SIZE)
2523 goto trunc;
2524
2525 bgp_open_header = (const struct bgp_open *)dat;
2526
2527 ND_PRINT("\n\t Version %u, ",
2528 GET_U_1(bgp_open_header->bgpo_version));
2529 ND_PRINT("my AS %s, ",
2530 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(bgp_open_header->bgpo_myas)));
2531 ND_PRINT("Holdtime %us, ",
2532 GET_BE_U_2(bgp_open_header->bgpo_holdtime));
2533 ND_PRINT("ID %s", ipaddr_string(ndo, bgp_open_header->bgpo_id));
2534 optslen = GET_U_1(bgp_open_header->bgpo_optlen);
2535 ND_PRINT("\n\t Optional parameters, length: %u", optslen);
2536
2537 opt = dat + BGP_OPEN_SIZE;
2538 length -= BGP_OPEN_SIZE;
2539
2540 i = 0;
2541 while (i < optslen) {
2542 uint8_t opt_type, opt_len;
2543
2544 ND_TCHECK_LEN(opt + i, BGP_OPT_SIZE);
2545 if (length < BGP_OPT_SIZE + i)
2546 goto trunc;
2547 bgpopt = (const struct bgp_opt *)(opt + i);
2548 opt_type = GET_U_1(bgpopt->bgpopt_type);
2549 opt_len = GET_U_1(bgpopt->bgpopt_len);
2550 if (BGP_OPT_SIZE + i + opt_len > optslen) {
2551 ND_PRINT("\n\t Option %u, length: %u, goes past the end of the options",
2552 opt_type, opt_len);
2553 break;
2554 }
2555
2556 ND_PRINT("\n\t Option %s (%u), length: %u",
2557 tok2str(bgp_opt_values,"Unknown",opt_type),
2558 opt_type,
2559 opt_len);
2560
2561 /* now let's decode the options we know*/
2562 switch(opt_type) {
2563
2564 case BGP_OPT_CAP:
2565 bgp_capabilities_print(ndo, opt + BGP_OPT_SIZE + i,
2566 opt_len);
2567 break;
2568
2569 case BGP_OPT_AUTH:
2570 default:
2571 ND_PRINT("\n\t no decoder for option %u",
2572 opt_type);
2573 break;
2574 }
2575 i += BGP_OPT_SIZE + opt_len;
2576 }
2577 return;
2578 trunc:
2579 nd_print_trunc(ndo);
2580 }
2581
2582 static void
2583 bgp_update_print(netdissect_options *ndo,
2584 const u_char *dat, u_int length)
2585 {
2586 const u_char *p;
2587 u_int withdrawn_routes_len;
2588 char buf[MAXHOSTNAMELEN + 100];
2589 int wpfx;
2590 u_int len;
2591 int i;
2592 int add_path;
2593 u_int path_id = 0;
2594
2595 ND_TCHECK_LEN(dat, BGP_SIZE);
2596 if (length < BGP_SIZE)
2597 goto trunc;
2598 p = dat + BGP_SIZE;
2599 length -= BGP_SIZE;
2600
2601 /* Unfeasible routes */
2602 ND_TCHECK_2(p);
2603 if (length < 2)
2604 goto trunc;
2605 withdrawn_routes_len = GET_BE_U_2(p);
2606 p += 2;
2607 length -= 2;
2608 if (withdrawn_routes_len > 1) {
2609 /*
2610 * Without keeping state from the original NLRI message,
2611 * it's not possible to tell if this a v4 or v6 route,
2612 * so only try to decode it if we're not v6 enabled.
2613 */
2614 ND_TCHECK_LEN(p, withdrawn_routes_len);
2615 if (length < withdrawn_routes_len)
2616 goto trunc;
2617 ND_PRINT("\n\t Withdrawn routes:");
2618 add_path = check_add_path(ndo, p, withdrawn_routes_len, 32);
2619 while (withdrawn_routes_len != 0) {
2620 if (add_path) {
2621 if (withdrawn_routes_len < 4) {
2622 p += withdrawn_routes_len;
2623 length -= withdrawn_routes_len;
2624 break;
2625 }
2626 path_id = GET_BE_U_4(p);
2627 p += 4;
2628 length -= 4;
2629 withdrawn_routes_len -= 4;
2630 }
2631 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
2632 if (wpfx == -1) {
2633 ND_PRINT("\n\t (illegal prefix length)");
2634 break;
2635 } else if (wpfx == -2)
2636 goto trunc;
2637 else if (wpfx == -3)
2638 goto trunc; /* bytes left, but not enough */
2639 else {
2640 ND_PRINT("\n\t %s", buf);
2641 if (add_path) {
2642 ND_PRINT(" Path Id: %u", path_id);
2643 }
2644 p += wpfx;
2645 length -= wpfx;
2646 withdrawn_routes_len -= wpfx;
2647 }
2648 }
2649 } else {
2650 ND_TCHECK_LEN(p, withdrawn_routes_len);
2651 if (length < withdrawn_routes_len)
2652 goto trunc;
2653 p += withdrawn_routes_len;
2654 length -= withdrawn_routes_len;
2655 }
2656
2657 ND_TCHECK_2(p);
2658 if (length < 2)
2659 goto trunc;
2660 len = GET_BE_U_2(p);
2661 p += 2;
2662 length -= 2;
2663
2664 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2665 /* No withdrawn routes, no path attributes, no NLRI */
2666 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2667 return;
2668 }
2669
2670 if (len) {
2671 /* do something more useful!*/
2672 while (len) {
2673 uint8_t aflags, atype, alenlen;
2674 uint16_t alen;
2675
2676 ND_TCHECK_2(p);
2677 if (length < 2)
2678 goto trunc;
2679 if (len < 2) {
2680 ND_PRINT("\n\t [path attrs too short]");
2681 p += len;
2682 length -= len;
2683 break;
2684 }
2685 aflags = GET_U_1(p);
2686 atype = GET_U_1(p + 1);
2687 p += 2;
2688 len -= 2;
2689 length -= 2;
2690 alenlen = bgp_attr_lenlen(aflags, p);
2691 ND_TCHECK_LEN(p, alenlen);
2692 if (length < alenlen)
2693 goto trunc;
2694 if (len < alenlen) {
2695 ND_PRINT("\n\t [path attrs too short]");
2696 p += len;
2697 length -= len;
2698 break;
2699 }
2700 alen = bgp_attr_len(aflags, p);
2701 p += alenlen;
2702 len -= alenlen;
2703 length -= alenlen;
2704
2705 ND_PRINT("\n\t %s (%u), length: %u",
2706 tok2str(bgp_attr_values, "Unknown Attribute", atype),
2707 atype,
2708 alen);
2709
2710 if (aflags) {
2711 ND_PRINT(", Flags [%s%s%s%s",
2712 aflags & 0x80 ? "O" : "",
2713 aflags & 0x40 ? "T" : "",
2714 aflags & 0x20 ? "P" : "",
2715 aflags & 0x10 ? "E" : "");
2716 if (aflags & 0xf)
2717 ND_PRINT("+%x", aflags & 0xf);
2718 ND_PRINT("]: ");
2719 }
2720 if (len < alen) {
2721 ND_PRINT(" [path attrs too short]");
2722 p += len;
2723 length -= len;
2724 break;
2725 }
2726 if (length < alen)
2727 goto trunc;
2728 if (!bgp_attr_print(ndo, atype, p, alen))
2729 goto trunc;
2730 p += alen;
2731 len -= alen;
2732 length -= alen;
2733 }
2734 }
2735
2736 if (length) {
2737 add_path = check_add_path(ndo, p, length, 32);
2738 ND_PRINT("\n\t Updated routes:");
2739 while (length != 0) {
2740 if (add_path) {
2741 ND_TCHECK_4(p);
2742 if (length < 4)
2743 goto trunc;
2744 path_id = GET_BE_U_4(p);
2745 p += 4;
2746 length -= 4;
2747 }
2748 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2749 if (i == -1) {
2750 ND_PRINT("\n\t (illegal prefix length)");
2751 break;
2752 } else if (i == -2)
2753 goto trunc;
2754 else if (i == -3)
2755 goto trunc; /* bytes left, but not enough */
2756 else {
2757 ND_PRINT("\n\t %s", buf);
2758 if (add_path) {
2759 ND_PRINT(" Path Id: %u", path_id);
2760 }
2761 p += i;
2762 length -= i;
2763 }
2764 }
2765 }
2766 return;
2767 trunc:
2768 nd_print_trunc(ndo);
2769 }
2770
2771 static void
2772 bgp_notification_print(netdissect_options *ndo,
2773 const u_char *dat, u_int length)
2774 {
2775 const struct bgp_notification *bgp_notification_header;
2776 const u_char *tptr;
2777 uint8_t bgpn_major, bgpn_minor;
2778 uint8_t shutdown_comm_length;
2779 uint8_t remainder_offset;
2780
2781 ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
2782 if (length<BGP_NOTIFICATION_SIZE)
2783 return;
2784
2785 bgp_notification_header = (const struct bgp_notification *)dat;
2786 bgpn_major = GET_U_1(bgp_notification_header->bgpn_major);
2787 bgpn_minor = GET_U_1(bgp_notification_header->bgpn_minor);
2788
2789 ND_PRINT(", %s (%u)",
2790 tok2str(bgp_notify_major_values, "Unknown Error",
2791 bgpn_major),
2792 bgpn_major);
2793
2794 switch (bgpn_major) {
2795
2796 case BGP_NOTIFY_MAJOR_MSG:
2797 ND_PRINT(", subcode %s (%u)",
2798 tok2str(bgp_notify_minor_msg_values, "Unknown",
2799 bgpn_minor),
2800 bgpn_minor);
2801 break;
2802 case BGP_NOTIFY_MAJOR_OPEN:
2803 ND_PRINT(", subcode %s (%u)",
2804 tok2str(bgp_notify_minor_open_values, "Unknown",
2805 bgpn_minor),
2806 bgpn_minor);
2807 break;
2808 case BGP_NOTIFY_MAJOR_UPDATE:
2809 ND_PRINT(", subcode %s (%u)",
2810 tok2str(bgp_notify_minor_update_values, "Unknown",
2811 bgpn_minor),
2812 bgpn_minor);
2813 break;
2814 case BGP_NOTIFY_MAJOR_FSM:
2815 ND_PRINT(" subcode %s (%u)",
2816 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2817 bgpn_minor),
2818 bgpn_minor);
2819 break;
2820 case BGP_NOTIFY_MAJOR_CAP:
2821 ND_PRINT(" subcode %s (%u)",
2822 tok2str(bgp_notify_minor_cap_values, "Unknown",
2823 bgpn_minor),
2824 bgpn_minor);
2825 break;
2826 case BGP_NOTIFY_MAJOR_CEASE:
2827 ND_PRINT(", subcode %s (%u)",
2828 tok2str(bgp_notify_minor_cease_values, "Unknown",
2829 bgpn_minor),
2830 bgpn_minor);
2831
2832 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2833 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2834 */
2835 if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2836 tptr = dat + BGP_NOTIFICATION_SIZE;
2837 ND_TCHECK_7(tptr);
2838 ND_PRINT(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2839 tok2str(af_values, "Unknown", GET_BE_U_2(tptr)),
2840 GET_BE_U_2(tptr),
2841 tok2str(bgp_safi_values, "Unknown", GET_U_1((tptr + 2))),
2842 GET_U_1((tptr + 2)),
2843 GET_BE_U_4(tptr + 3));
2844 }
2845 /*
2846 * draft-ietf-idr-shutdown describes a method to send a communication
2847 * intended for human consumption regarding the Administrative Shutdown
2848 */
2849 if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
2850 bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
2851 length >= BGP_NOTIFICATION_SIZE + 1) {
2852 tptr = dat + BGP_NOTIFICATION_SIZE;
2853 ND_TCHECK_1(tptr);
2854 shutdown_comm_length = GET_U_1(tptr);
2855 remainder_offset = 0;
2856 /* garbage, hexdump it all */
2857 if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN ||
2858 shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) {
2859 ND_PRINT(", invalid Shutdown Communication length");
2860 }
2861 else if (shutdown_comm_length == 0) {
2862 ND_PRINT(", empty Shutdown Communication");
2863 remainder_offset += 1;
2864 }
2865 /* a proper shutdown communication */
2866 else {
2867 ND_TCHECK_LEN(tptr + 1, shutdown_comm_length);
2868 ND_PRINT(", Shutdown Communication (length: %u): \"", shutdown_comm_length);
2869 (void)nd_printn(ndo, tptr+1, shutdown_comm_length, NULL);
2870 ND_PRINT("\"");
2871 remainder_offset += shutdown_comm_length + 1;
2872 }
2873 /* if there is trailing data, hexdump it */
2874 if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) {
2875 ND_PRINT(", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2876 hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2877 }
2878 }
2879 break;
2880 default:
2881 break;
2882 }
2883
2884 return;
2885 trunc:
2886 nd_print_trunc(ndo);
2887 }
2888
2889 static void
2890 bgp_route_refresh_print(netdissect_options *ndo,
2891 const u_char *pptr, u_int len)
2892 {
2893 const struct bgp_route_refresh *bgp_route_refresh_header;
2894
2895 ND_TCHECK_LEN(pptr, BGP_ROUTE_REFRESH_SIZE);
2896
2897 /* some little sanity checking */
2898 if (len<BGP_ROUTE_REFRESH_SIZE)
2899 return;
2900
2901 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2902
2903 ND_PRINT("\n\t AFI %s (%u), SAFI %s (%u)",
2904 tok2str(af_values,"Unknown",
2905 GET_BE_U_2(bgp_route_refresh_header->afi)),
2906 GET_BE_U_2(bgp_route_refresh_header->afi),
2907 tok2str(bgp_safi_values,"Unknown",
2908 GET_U_1(bgp_route_refresh_header->safi)),
2909 GET_U_1(bgp_route_refresh_header->safi));
2910
2911 if (ndo->ndo_vflag > 1) {
2912 ND_TCHECK_LEN(pptr, len);
2913 print_unknown_data(ndo, pptr, "\n\t ", len);
2914 }
2915
2916 return;
2917 trunc:
2918 nd_print_trunc(ndo);
2919 }
2920
2921 static int
2922 bgp_pdu_print(netdissect_options *ndo,
2923 const u_char *dat, u_int length)
2924 {
2925 const struct bgp *bgp_header;
2926 uint8_t bgp_type;
2927
2928 ND_TCHECK_LEN(dat, BGP_SIZE);
2929 bgp_header = (const struct bgp *)dat;
2930 bgp_type = GET_U_1(bgp_header->bgp_type);
2931
2932 ND_PRINT("\n\t%s Message (%u), length: %u",
2933 tok2str(bgp_msg_values, "Unknown", bgp_type),
2934 bgp_type,
2935 length);
2936
2937 switch (bgp_type) {
2938 case BGP_OPEN:
2939 bgp_open_print(ndo, dat, length);
2940 break;
2941 case BGP_UPDATE:
2942 bgp_update_print(ndo, dat, length);
2943 break;
2944 case BGP_NOTIFICATION:
2945 bgp_notification_print(ndo, dat, length);
2946 break;
2947 case BGP_KEEPALIVE:
2948 break;
2949 case BGP_ROUTE_REFRESH:
2950 bgp_route_refresh_print(ndo, dat, length);
2951 break;
2952 default:
2953 /* we have no decoder for the BGP message */
2954 ND_TCHECK_LEN(dat, length);
2955 ND_PRINT("\n\t no Message %u decoder", bgp_type);
2956 print_unknown_data(ndo, dat, "\n\t ", length);
2957 break;
2958 }
2959 return 1;
2960 trunc:
2961 nd_print_trunc(ndo);
2962 return 0;
2963 }
2964
2965 void
2966 bgp_print(netdissect_options *ndo,
2967 const u_char *dat, u_int length _U_)
2968 {
2969 const u_char *p;
2970 const u_char *ep = ndo->ndo_snapend;
2971 const u_char *start;
2972 const u_char marker[] = {
2973 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2974 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2975 };
2976 const struct bgp *bgp_header;
2977 uint16_t hlen;
2978
2979 ndo->ndo_protocol = "bgp";
2980 ND_PRINT(": BGP");
2981
2982 if (ndo->ndo_vflag < 1) /* lets be less chatty */
2983 return;
2984
2985 p = dat;
2986 start = p;
2987 while (p < ep) {
2988 if (!ND_TTEST_1(p))
2989 break;
2990 if (GET_U_1(p) != 0xff) {
2991 p++;
2992 continue;
2993 }
2994
2995 if (!ND_TTEST_LEN(p, sizeof(marker)))
2996 break;
2997 if (memcmp(p, marker, sizeof(marker)) != 0) {
2998 p++;
2999 continue;
3000 }
3001
3002 /* found BGP header */
3003 ND_TCHECK_LEN(p, BGP_SIZE);
3004 bgp_header = (const struct bgp *)p;
3005
3006 if (start != p)
3007 nd_print_trunc(ndo);
3008
3009 hlen = GET_BE_U_2(bgp_header->bgp_len);
3010 if (hlen < BGP_SIZE) {
3011 ND_PRINT("\nmessage length %u < %u", hlen, BGP_SIZE);
3012 nd_print_invalid(ndo);
3013 break;
3014 }
3015
3016 if (ND_TTEST_LEN(p, hlen)) {
3017 if (!bgp_pdu_print(ndo, p, hlen))
3018 return;
3019 p += hlen;
3020 start = p;
3021 } else {
3022 ND_PRINT("\n[|BGP %s]",
3023 tok2str(bgp_msg_values,
3024 "Unknown Message Type",
3025 GET_U_1(bgp_header->bgp_type)));
3026 break;
3027 }
3028 }
3029
3030 return;
3031
3032 trunc:
3033 nd_print_trunc(ndo);
3034 }
[mirror] the TCPdump network dissector