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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) ? EXTRACT_BE_U_2(p) : EXTRACT_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 - draft-ietf-idr-bgp-ext-communities-05 */
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, u_int buflen)
539 {
540 struct in_addr addr;
541 u_int plen, plenbytes;
542
543 ND_TCHECK_1(pptr);
544 ITEMCHECK(1);
545 plen = EXTRACT_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, u_int buflen)
571 {
572 struct in_addr addr;
573 u_int plen, plenbytes;
574
575 /* prefix length and label = 4 bytes */
576 ND_TCHECK_4(pptr);
577 ITEMCHECK(4);
578 plen = EXTRACT_U_1(pptr); /* get prefix length */
579
580 /* this is one of the weirdnesses of rfc3107
581 the label length (actually the label + COS bits)
582 is added to the prefix length;
583 we also do only read out just one label -
584 there is no real application for advertisement of
585 stacked labels in a single BGP message
586 */
587
588 if (24 > plen)
589 return -1;
590
591 plen-=24; /* adjust prefixlen - labellength */
592
593 if (32 < plen)
594 return -1;
595 itemlen -= 4;
596
597 memset(&addr, 0, sizeof(addr));
598 plenbytes = (plen + 7) / 8;
599 ND_TCHECK_LEN(pptr + 4, plenbytes);
600 ITEMCHECK(plenbytes);
601 memcpy(&addr, pptr + 4, plenbytes);
602 if (plen % 8) {
603 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
604 }
605 /* the label may get offsetted by 4 bits so lets shift it right */
606 nd_snprintf(buf, buflen, "%s/%u, label:%u %s",
607 ipaddr_string(ndo, (const u_char *)&addr),
608 plen,
609 EXTRACT_BE_U_3(pptr + 1)>>4,
610 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
611
612 return 4 + plenbytes;
613
614 trunc:
615 return -2;
616
617 badtlv:
618 return -3;
619 }
620
621 /*
622 * bgp_vpn_ip_print
623 *
624 * print an ipv4 or ipv6 address into a buffer dependend on address length.
625 */
626 static char *
627 bgp_vpn_ip_print(netdissect_options *ndo,
628 const u_char *pptr, u_int addr_length)
629 {
630
631 /* worst case string is s fully formatted v6 address */
632 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
633 char *pos = addr;
634
635 switch(addr_length) {
636 case (sizeof(nd_ipv4) << 3): /* 32 */
637 ND_TCHECK_LEN(pptr, sizeof(nd_ipv4));
638 nd_snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
639 break;
640 case (sizeof(nd_ipv6) << 3): /* 128 */
641 ND_TCHECK_LEN(pptr, sizeof(nd_ipv6));
642 nd_snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
643 break;
644 default:
645 nd_snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
646 break;
647 }
648 pos += strlen(pos);
649
650 trunc:
651 *(pos) = '\0';
652 return (addr);
653 }
654
655 /*
656 * bgp_vpn_sg_print
657 *
658 * print an multicast s,g entry into a buffer.
659 * the s,g entry is encoded like this.
660 *
661 * +-----------------------------------+
662 * | Multicast Source Length (1 octet) |
663 * +-----------------------------------+
664 * | Multicast Source (Variable) |
665 * +-----------------------------------+
666 * | Multicast Group Length (1 octet) |
667 * +-----------------------------------+
668 * | Multicast Group (Variable) |
669 * +-----------------------------------+
670 *
671 * return the number of bytes read from the wire.
672 */
673 static u_int
674 bgp_vpn_sg_print(netdissect_options *ndo,
675 const u_char *pptr, char *buf, u_int buflen)
676 {
677 uint8_t addr_length;
678 u_int total_length, offset;
679
680 total_length = 0;
681
682 /* Source address length, encoded in bits */
683 ND_TCHECK_1(pptr);
684 addr_length = EXTRACT_U_1(pptr);
685 pptr++;
686
687 /* Source address */
688 ND_TCHECK_LEN(pptr, (addr_length >> 3));
689 total_length += (addr_length >> 3) + 1;
690 offset = strlen(buf);
691 if (addr_length) {
692 nd_snprintf(buf + offset, buflen - offset, ", Source %s",
693 bgp_vpn_ip_print(ndo, pptr, addr_length));
694 pptr += (addr_length >> 3);
695 }
696
697 /* Group address length, encoded in bits */
698 ND_TCHECK_1(pptr);
699 addr_length = EXTRACT_U_1(pptr);
700 pptr++;
701
702 /* Group address */
703 ND_TCHECK_LEN(pptr, (addr_length >> 3));
704 total_length += (addr_length >> 3) + 1;
705 offset = strlen(buf);
706 if (addr_length) {
707 nd_snprintf(buf + offset, buflen - offset, ", Group %s",
708 bgp_vpn_ip_print(ndo, pptr, addr_length));
709 pptr += (addr_length >> 3);
710 }
711
712 trunc:
713 return (total_length);
714 }
715
716 /* RDs and RTs share the same semantics
717 * we use bgp_vpn_rd_print for
718 * printing route targets inside a NLRI */
719 const char *
720 bgp_vpn_rd_print(netdissect_options *ndo,
721 const u_char *pptr)
722 {
723 /* allocate space for the largest possible string */
724 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
725 char *pos = rd;
726
727 /* ok lets load the RD format */
728 switch (EXTRACT_BE_U_2(pptr)) {
729
730 /* 2-byte-AS:number fmt*/
731 case 0:
732 nd_snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
733 EXTRACT_BE_U_2(pptr + 2),
734 EXTRACT_BE_U_4(pptr + 4),
735 EXTRACT_U_1(pptr + 4), EXTRACT_U_1(pptr + 5),
736 EXTRACT_U_1(pptr + 6), EXTRACT_U_1(pptr + 7));
737 break;
738 /* IP-address:AS fmt*/
739
740 case 1:
741 nd_snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
742 EXTRACT_U_1(pptr + 2), EXTRACT_U_1(pptr + 3),
743 EXTRACT_U_1(pptr + 4), EXTRACT_U_1(pptr + 5),
744 EXTRACT_BE_U_2(pptr + 6));
745 break;
746
747 /* 4-byte-AS:number fmt*/
748 case 2:
749 nd_snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
750 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(pptr + 2)),
751 EXTRACT_BE_U_2(pptr + 6), EXTRACT_U_1(pptr + 2),
752 EXTRACT_U_1(pptr + 3), EXTRACT_U_1(pptr + 4),
753 EXTRACT_U_1(pptr + 5), EXTRACT_BE_U_2(pptr + 6));
754 break;
755 default:
756 nd_snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
757 break;
758 }
759 pos += strlen(pos);
760 *(pos) = '\0';
761 return (rd);
762 }
763
764 static int
765 decode_rt_routing_info(netdissect_options *ndo,
766 const u_char *pptr, char *buf, u_int buflen)
767 {
768 uint8_t route_target[8];
769 u_int plen;
770 char asbuf[sizeof(astostr)]; /* bgp_vpn_rd_print() overwrites astostr */
771
772 /* NLRI "prefix length" from RFC 2858 Section 4. */
773 ND_TCHECK_1(pptr);
774 plen = EXTRACT_U_1(pptr); /* get prefix length */
775
776 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
777 * RFC 4684 Section 4 defines the layout of "origin AS" and "route
778 * target" fields inside the "prefix" depending on its length.
779 */
780 if (0 == plen) {
781 /* Without "origin AS", without "route target". */
782 nd_snprintf(buf, buflen, "default route target");
783 return 1;
784 }
785
786 if (32 > plen)
787 return -1;
788
789 /* With at least "origin AS", possibly with "route target". */
790 ND_TCHECK_4(pptr + 1);
791 as_printf(ndo, asbuf, sizeof(asbuf), EXTRACT_BE_U_4(pptr + 1));
792
793 plen -= 32; /* adjust prefix length */
794
795 if (64 < plen)
796 return -1;
797
798 /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 }
799 * and gives the number of octets in the variable-length "route
800 * target" field inside this NLRI "prefix". Look for it.
801 */
802 memset(&route_target, 0, sizeof(route_target));
803 ND_TCHECK_LEN(pptr + 5, (plen + 7) / 8);
804 memcpy(&route_target, pptr + 5, (plen + 7) / 8);
805 /* Which specification says to do this? */
806 if (plen % 8) {
807 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
808 ((0xff00 >> (plen % 8)) & 0xff);
809 }
810 nd_snprintf(buf, buflen, "origin AS: %s, route target %s",
811 asbuf,
812 bgp_vpn_rd_print(ndo, (u_char *)&route_target));
813
814 return 5 + (plen + 7) / 8;
815
816 trunc:
817 return -2;
818 }
819
820 static int
821 decode_labeled_vpn_prefix4(netdissect_options *ndo,
822 const u_char *pptr, char *buf, u_int buflen)
823 {
824 struct in_addr addr;
825 u_int plen;
826
827 ND_TCHECK_1(pptr);
828 plen = EXTRACT_U_1(pptr); /* get prefix length */
829
830 if ((24+64) > plen)
831 return -1;
832
833 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
834
835 if (32 < plen)
836 return -1;
837
838 memset(&addr, 0, sizeof(addr));
839 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
840 memcpy(&addr, pptr + 12, (plen + 7) / 8);
841 if (plen % 8) {
842 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
843 ((0xff00 >> (plen % 8)) & 0xff);
844 }
845 /* the label may get offsetted by 4 bits so lets shift it right */
846 nd_snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
847 bgp_vpn_rd_print(ndo, pptr+4),
848 ipaddr_string(ndo, (const u_char *)&addr),
849 plen,
850 EXTRACT_BE_U_3(pptr + 1)>>4,
851 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
852
853 return 12 + (plen + 7) / 8;
854
855 trunc:
856 return -2;
857 }
858
859 /*
860 * +-------------------------------+
861 * | |
862 * | RD:IPv4-address (12 octets) |
863 * | |
864 * +-------------------------------+
865 * | MDT Group-address (4 octets) |
866 * +-------------------------------+
867 */
868
869 #define MDT_VPN_NLRI_LEN 16
870
871 static int
872 decode_mdt_vpn_nlri(netdissect_options *ndo,
873 const u_char *pptr, char *buf, u_int buflen)
874 {
875 const u_char *rd;
876 const u_char *vpn_ip;
877
878 ND_TCHECK_1(pptr);
879
880 /* if the NLRI is not predefined length, quit.*/
881 if (EXTRACT_U_1(pptr) != MDT_VPN_NLRI_LEN * 8)
882 return -1;
883 pptr++;
884
885 /* RD */
886 ND_TCHECK_8(pptr);
887 rd = pptr;
888 pptr += 8;
889
890 /* IPv4 address */
891 ND_TCHECK_LEN(pptr, sizeof(nd_ipv4));
892 vpn_ip = pptr;
893 pptr += sizeof(nd_ipv4);
894
895 /* MDT Group Address */
896 ND_TCHECK_LEN(pptr, sizeof(nd_ipv4));
897
898 nd_snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
899 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
900
901 return MDT_VPN_NLRI_LEN + 1;
902
903 trunc:
904 return -2;
905 }
906
907 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
908 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
909 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
910 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
911 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
912 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
913 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
914
915 static const struct tok bgp_multicast_vpn_route_type_values[] = {
916 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
917 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
918 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
919 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
920 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
921 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
922 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
923 { 0, NULL}
924 };
925
926 static int
927 decode_multicast_vpn(netdissect_options *ndo,
928 const u_char *pptr, char *buf, size_t buflen)
929 {
930 uint8_t route_type, route_length, addr_length;
931 u_int sg_length;
932 u_int offset;
933
934 ND_TCHECK_2(pptr);
935 route_type = EXTRACT_U_1(pptr);
936 pptr++;
937 route_length = EXTRACT_U_1(pptr);
938 pptr++;
939
940 nd_snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
941 tok2str(bgp_multicast_vpn_route_type_values,
942 "Unknown", route_type),
943 route_type, route_length);
944
945 switch(route_type) {
946 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
947 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
948 offset = strlen(buf);
949 nd_snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
950 bgp_vpn_rd_print(ndo, pptr),
951 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
952 (route_length - BGP_VPN_RD_LEN) << 3));
953 break;
954 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
955 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
956 offset = strlen(buf);
957 nd_snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
958 bgp_vpn_rd_print(ndo, pptr),
959 as_printf(ndo, astostr, sizeof(astostr),
960 EXTRACT_BE_U_4(pptr + BGP_VPN_RD_LEN)));
961 break;
962
963 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
964 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
965 offset = strlen(buf);
966 nd_snprintf(buf + offset, buflen - offset, ", RD: %s",
967 bgp_vpn_rd_print(ndo, pptr));
968 pptr += BGP_VPN_RD_LEN;
969
970 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
971 addr_length = route_length - sg_length;
972
973 ND_TCHECK_LEN(pptr, addr_length);
974 offset = strlen(buf);
975 nd_snprintf(buf + offset, buflen - offset, ", Originator %s",
976 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
977 break;
978
979 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
980 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
981 offset = strlen(buf);
982 nd_snprintf(buf + offset, buflen - offset, ", RD: %s",
983 bgp_vpn_rd_print(ndo, pptr));
984 pptr += BGP_VPN_RD_LEN;
985
986 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
987 break;
988
989 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
990 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
991 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
992 offset = strlen(buf);
993 nd_snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
994 bgp_vpn_rd_print(ndo, pptr),
995 as_printf(ndo, astostr, sizeof(astostr),
996 EXTRACT_BE_U_4(pptr + BGP_VPN_RD_LEN)));
997 pptr += BGP_VPN_RD_LEN + 4;
998
999 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1000 break;
1001
1002 /*
1003 * no per route-type printing yet.
1004 */
1005 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
1006 default:
1007 break;
1008 }
1009
1010 return route_length + 2;
1011
1012 trunc:
1013 return -2;
1014 }
1015
1016 /*
1017 * As I remember, some versions of systems have an snprintf() that
1018 * returns -1 if the buffer would have overflowed. If the return
1019 * value is negative, set buflen to 0, to indicate that we've filled
1020 * the buffer up.
1021 *
1022 * If the return value is greater than buflen, that means that
1023 * the buffer would have overflowed; again, set buflen to 0 in
1024 * that case.
1025 */
1026 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1027 if (stringlen<0) \
1028 buflen=0; \
1029 else if ((u_int)stringlen>buflen) \
1030 buflen=0; \
1031 else { \
1032 buflen-=stringlen; \
1033 buf+=stringlen; \
1034 }
1035
1036 static int
1037 decode_labeled_vpn_l2(netdissect_options *ndo,
1038 const u_char *pptr, char *buf, u_int buflen)
1039 {
1040 u_int plen, tlen, tlv_type, tlv_len, ttlv_len;
1041 int stringlen;
1042
1043 ND_TCHECK_2(pptr);
1044 plen = EXTRACT_BE_U_2(pptr);
1045 tlen = plen;
1046 pptr += 2;
1047 /* Old and new L2VPN NLRI share AFI/SAFI
1048 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1049 * and > 17 as old format. Complain for the middle case
1050 */
1051 if (plen == 12) {
1052 /* assume AD-only with RD, BGPNH */
1053 ND_TCHECK_LEN(pptr, 12);
1054 buf[0] = '\0';
1055 stringlen = nd_snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1056 bgp_vpn_rd_print(ndo, pptr),
1057 ipaddr_string(ndo, pptr+8));
1058 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1059 pptr += 12;
1060 tlen -= 12;
1061 return plen + 2;
1062 } else if (plen > 17) {
1063 /* assume old format */
1064 /* RD, ID, LBLKOFF, LBLBASE */
1065
1066 ND_TCHECK_LEN(pptr, 15);
1067 buf[0] = '\0';
1068 stringlen = nd_snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1069 bgp_vpn_rd_print(ndo, pptr),
1070 EXTRACT_BE_U_2(pptr + 8),
1071 EXTRACT_BE_U_2(pptr + 10),
1072 EXTRACT_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1073 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1074 pptr += 15;
1075 tlen -= 15;
1076
1077 /* ok now the variable part - lets read out TLVs*/
1078 while (tlen != 0) {
1079 if (tlen < 3) {
1080 if (buflen != 0) {
1081 stringlen=nd_snprintf(buf,buflen, "\n\t\tran past the end");
1082 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1083 }
1084 return plen + 2;
1085 }
1086 ND_TCHECK_3(pptr);
1087 tlv_type = EXTRACT_U_1(pptr);
1088 pptr++;
1089 tlv_len = EXTRACT_BE_U_2(pptr); /* length, in *bits* */
1090 ttlv_len = (tlv_len + 7)/8; /* length, in *bytes* */
1091 pptr += 2;
1092
1093 switch(tlv_type) {
1094 case 1:
1095 if (buflen != 0) {
1096 stringlen=nd_snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1097 tlv_type,
1098 tlv_len);
1099 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1100 }
1101 while (ttlv_len != 0) {
1102 if (tlen < 1) {
1103 if (buflen != 0) {
1104 stringlen=nd_snprintf(buf,buflen, " (ran past the end)");
1105 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1106 }
1107 return plen + 2;
1108 }
1109 ND_TCHECK_1(pptr);
1110 if (buflen != 0) {
1111 stringlen=nd_snprintf(buf,buflen, "%02x",
1112 EXTRACT_U_1(pptr));
1113 pptr++;
1114 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1115 }
1116 ttlv_len--;
1117 tlen--;
1118 }
1119 break;
1120 default:
1121 if (buflen != 0) {
1122 stringlen=nd_snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1123 tlv_type,
1124 tlv_len);
1125 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1126 }
1127 if (tlen < ttlv_len) {
1128 if (buflen != 0) {
1129 stringlen=nd_snprintf(buf,buflen, " (ran past the end)");
1130 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1131 }
1132 return plen + 2;
1133 }
1134 tlen -= ttlv_len;
1135 break;
1136 }
1137 }
1138 return plen + 2;
1139 } else {
1140 /* complain bitterly ? */
1141 /* fall through */
1142 goto trunc;
1143 }
1144
1145 trunc:
1146 return -2;
1147 }
1148
1149 int
1150 decode_prefix6(netdissect_options *ndo,
1151 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1152 {
1153 struct in6_addr addr;
1154 u_int plen, plenbytes;
1155
1156 ND_TCHECK_1(pd);
1157 ITEMCHECK(1);
1158 plen = EXTRACT_U_1(pd);
1159 if (128 < plen)
1160 return -1;
1161 itemlen -= 1;
1162
1163 memset(&addr, 0, sizeof(addr));
1164 plenbytes = (plen + 7) / 8;
1165 ND_TCHECK_LEN(pd + 1, plenbytes);
1166 ITEMCHECK(plenbytes);
1167 memcpy(&addr, pd + 1, plenbytes);
1168 if (plen % 8) {
1169 addr.s6_addr[plenbytes - 1] &=
1170 ((0xff00 >> (plen % 8)) & 0xff);
1171 }
1172 nd_snprintf(buf, buflen, "%s/%u", ip6addr_string(ndo, (const u_char *)&addr), plen);
1173 return 1 + plenbytes;
1174
1175 trunc:
1176 return -2;
1177
1178 badtlv:
1179 return -3;
1180 }
1181
1182 static int
1183 decode_labeled_prefix6(netdissect_options *ndo,
1184 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1185 {
1186 struct in6_addr addr;
1187 u_int plen, plenbytes;
1188
1189 /* prefix length and label = 4 bytes */
1190 ND_TCHECK_4(pptr);
1191 ITEMCHECK(4);
1192 plen = EXTRACT_U_1(pptr); /* get prefix length */
1193
1194 if (24 > plen)
1195 return -1;
1196
1197 plen -= 24; /* adjust prefixlen - labellength */
1198
1199 if (128 < plen)
1200 return -1;
1201 itemlen -= 4;
1202
1203 memset(&addr, 0, sizeof(addr));
1204 plenbytes = (plen + 7) / 8;
1205 ND_TCHECK_LEN(pptr + 4, plenbytes);
1206 memcpy(&addr, pptr + 4, plenbytes);
1207 if (plen % 8) {
1208 addr.s6_addr[plenbytes - 1] &=
1209 ((0xff00 >> (plen % 8)) & 0xff);
1210 }
1211 /* the label may get offsetted by 4 bits so lets shift it right */
1212 nd_snprintf(buf, buflen, "%s/%u, label:%u %s",
1213 ip6addr_string(ndo, (const u_char *)&addr),
1214 plen,
1215 EXTRACT_BE_U_3(pptr + 1)>>4,
1216 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1217
1218 return 4 + plenbytes;
1219
1220 trunc:
1221 return -2;
1222
1223 badtlv:
1224 return -3;
1225 }
1226
1227 static int
1228 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1229 const u_char *pptr, char *buf, u_int buflen)
1230 {
1231 struct in6_addr addr;
1232 u_int plen;
1233
1234 ND_TCHECK_1(pptr);
1235 plen = EXTRACT_U_1(pptr); /* get prefix length */
1236
1237 if ((24+64) > plen)
1238 return -1;
1239
1240 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1241
1242 if (128 < plen)
1243 return -1;
1244
1245 memset(&addr, 0, sizeof(addr));
1246 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1247 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1248 if (plen % 8) {
1249 addr.s6_addr[(plen + 7) / 8 - 1] &=
1250 ((0xff00 >> (plen % 8)) & 0xff);
1251 }
1252 /* the label may get offsetted by 4 bits so lets shift it right */
1253 nd_snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1254 bgp_vpn_rd_print(ndo, pptr+4),
1255 ip6addr_string(ndo, (const u_char *)&addr),
1256 plen,
1257 EXTRACT_BE_U_3(pptr + 1)>>4,
1258 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1259
1260 return 12 + (plen + 7) / 8;
1261
1262 trunc:
1263 return -2;
1264 }
1265
1266 static int
1267 decode_clnp_prefix(netdissect_options *ndo,
1268 const u_char *pptr, char *buf, u_int buflen)
1269 {
1270 uint8_t addr[19];
1271 u_int plen;
1272
1273 ND_TCHECK_1(pptr);
1274 plen = EXTRACT_U_1(pptr); /* get prefix length */
1275
1276 if (152 < plen)
1277 return -1;
1278
1279 memset(&addr, 0, sizeof(addr));
1280 ND_TCHECK_LEN(pptr + 4, (plen + 7) / 8);
1281 memcpy(&addr, pptr + 4, (plen + 7) / 8);
1282 if (plen % 8) {
1283 addr[(plen + 7) / 8 - 1] &=
1284 ((0xff00 >> (plen % 8)) & 0xff);
1285 }
1286 nd_snprintf(buf, buflen, "%s/%u",
1287 isonsap_string(ndo, addr,(plen + 7) / 8),
1288 plen);
1289
1290 return 1 + (plen + 7) / 8;
1291
1292 trunc:
1293 return -2;
1294 }
1295
1296 static int
1297 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1298 const u_char *pptr, char *buf, u_int buflen)
1299 {
1300 uint8_t addr[19];
1301 u_int plen;
1302
1303 ND_TCHECK_1(pptr);
1304 plen = EXTRACT_U_1(pptr); /* get prefix length */
1305
1306 if ((24+64) > plen)
1307 return -1;
1308
1309 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1310
1311 if (152 < plen)
1312 return -1;
1313
1314 memset(&addr, 0, sizeof(addr));
1315 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1316 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1317 if (plen % 8) {
1318 addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
1319 }
1320 /* the label may get offsetted by 4 bits so lets shift it right */
1321 nd_snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1322 bgp_vpn_rd_print(ndo, pptr+4),
1323 isonsap_string(ndo, addr,(plen + 7) / 8),
1324 plen,
1325 EXTRACT_BE_U_3(pptr + 1)>>4,
1326 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1327
1328 return 12 + (plen + 7) / 8;
1329
1330 trunc:
1331 return -2;
1332 }
1333
1334 /*
1335 * bgp_attr_get_as_size
1336 *
1337 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1338 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1339 * support, exchange AS-Path with the same path-attribute type value 0x02.
1340 */
1341 static u_int
1342 bgp_attr_get_as_size(netdissect_options *ndo,
1343 uint8_t bgpa_type, const u_char *pptr, u_int len)
1344 {
1345 const u_char *tptr = pptr;
1346
1347 /*
1348 * If the path attribute is the optional AS4 path type, then we already
1349 * know, that ASs must be encoded in 4 byte format.
1350 */
1351 if (bgpa_type == BGPTYPE_AS4_PATH) {
1352 return 4;
1353 }
1354
1355 /*
1356 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1357 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1358 * each.
1359 */
1360 while (tptr < pptr + len) {
1361 ND_TCHECK_1(tptr);
1362
1363 /*
1364 * If we do not find a valid segment type, our guess might be wrong.
1365 */
1366 if (EXTRACT_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || EXTRACT_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
1367 goto trunc;
1368 }
1369 ND_TCHECK_1(tptr + 1);
1370 tptr += 2 + EXTRACT_U_1(tptr + 1) * 2;
1371 }
1372
1373 /*
1374 * If we correctly reached end of the AS path attribute data content,
1375 * then most likely ASs were indeed encoded as 2 bytes.
1376 */
1377 if (tptr == pptr + len) {
1378 return 2;
1379 }
1380
1381 trunc:
1382
1383 /*
1384 * We can come here, either we did not have enough data, or if we
1385 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1386 * so that calller can try to decode each AS as of 4 bytes. If indeed
1387 * there was not enough data, it will crib and end the parse anyways.
1388 */
1389 return 4;
1390 }
1391
1392 /*
1393 * The only way to know that a BGP UPDATE message is using add path is
1394 * by checking if the capability is in the OPEN message which we may have missed.
1395 * So this function checks if it is possible that the update could contain add path
1396 * and if so it checks that standard BGP doesn't make sense.
1397 */
1398 static int
1399 check_add_path(netdissect_options *ndo, const u_char *pptr, u_int length,
1400 u_int max_prefix_length)
1401 {
1402 u_int offset, prefix_length;
1403
1404 if (length < 5) {
1405 return 0;
1406 }
1407
1408 /*
1409 * Scan through the NLRI information under the assumpetion that
1410 * it doesn't have path IDs.
1411 */
1412 for (offset = 0; offset < length;) {
1413 offset += 4;
1414 if (!ND_TTEST_1(pptr + offset)) {
1415 /* We ran out of captured data; quit scanning. */
1416 break;
1417 }
1418 prefix_length = EXTRACT_U_1(pptr + offset);
1419 /*
1420 * Add 4 to cover the path id
1421 * and check the prefix length isn't greater than 32/128.
1422 */
1423 if (prefix_length > max_prefix_length) {
1424 return 0;
1425 }
1426 /* Add 1 for the prefix_length byte and prefix_length to cover the address */
1427 offset += 1 + ((prefix_length + 7) / 8);
1428 }
1429 /* check we haven't gone past the end of the section */
1430 if (offset > length) {
1431 return 0;
1432 }
1433
1434 /* check it's not standard BGP */
1435 for (offset = 0; offset < length; ) {
1436 if (!ND_TTEST_1(pptr + offset)) {
1437 /* We ran out of captured data; quit scanning. */
1438 break;
1439 }
1440 prefix_length = EXTRACT_U_1(pptr + offset);
1441 /*
1442 * If the prefix_length is zero (0.0.0.0/0)
1443 * and since it's not the only address (length >= 5)
1444 * then it is add-path
1445 */
1446 if (prefix_length < 1 || prefix_length > max_prefix_length) {
1447 return 1;
1448 }
1449 offset += 1 + ((prefix_length + 7) / 8);
1450 }
1451 if (offset > length) {
1452 return 1;
1453 }
1454
1455 /* assume not add-path by default */
1456 return 0;
1457 }
1458
1459 static int
1460 bgp_attr_print(netdissect_options *ndo,
1461 u_int atype, const u_char *pptr, u_int len)
1462 {
1463 u_int i;
1464 uint16_t af;
1465 uint8_t safi, snpa, nhlen;
1466 union { /* copy buffer for bandwidth values */
1467 float f;
1468 uint32_t i;
1469 } bw;
1470 int advance;
1471 u_int tlen;
1472 const u_char *tptr;
1473 char buf[MAXHOSTNAMELEN + 100];
1474 u_int as_size;
1475 int add_path4, add_path6;
1476 u_int path_id = 0;
1477
1478 tptr = pptr;
1479 tlen = len;
1480
1481 switch (atype) {
1482 case BGPTYPE_ORIGIN:
1483 if (len != 1)
1484 ND_PRINT("invalid len");
1485 else {
1486 ND_TCHECK_1(tptr);
1487 ND_PRINT("%s", tok2str(bgp_origin_values,
1488 "Unknown Origin Typecode",
1489 EXTRACT_U_1(tptr)));
1490 }
1491 break;
1492
1493 /*
1494 * Process AS4 byte path and AS2 byte path attributes here.
1495 */
1496 case BGPTYPE_AS4_PATH:
1497 case BGPTYPE_AS_PATH:
1498 if (len % 2) {
1499 ND_PRINT("invalid len");
1500 break;
1501 }
1502 if (!len) {
1503 ND_PRINT("empty");
1504 break;
1505 }
1506
1507 /*
1508 * BGP updates exchanged between New speakers that support 4
1509 * byte AS, ASs are always encoded in 4 bytes. There is no
1510 * definitive way to find this, just by the packet's
1511 * contents. So, check for packet's TLV's sanity assuming
1512 * 2 bytes first, and it does not pass, assume that ASs are
1513 * encoded in 4 bytes format and move on.
1514 */
1515 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1516
1517 while (tptr < pptr + len) {
1518 ND_TCHECK_1(tptr);
1519 ND_PRINT("%s", tok2str(bgp_as_path_segment_open_values,
1520 "?", EXTRACT_U_1(tptr)));
1521 ND_TCHECK_1(tptr + 1);
1522 for (i = 0; i < EXTRACT_U_1(tptr + 1) * as_size; i += as_size) {
1523 ND_TCHECK_LEN(tptr + 2 + i, as_size);
1524 ND_PRINT("%s ",
1525 as_printf(ndo, astostr, sizeof(astostr),
1526 as_size == 2 ?
1527 EXTRACT_BE_U_2(tptr + i + 2) :
1528 EXTRACT_BE_U_4(tptr + i + 2)));
1529 }
1530 ND_TCHECK_1(tptr);
1531 ND_PRINT("%s", tok2str(bgp_as_path_segment_close_values,
1532 "?", EXTRACT_U_1(tptr)));
1533 ND_TCHECK_1(tptr + 1);
1534 tptr += 2 + EXTRACT_U_1(tptr + 1) * as_size;
1535 }
1536 break;
1537 case BGPTYPE_NEXT_HOP:
1538 if (len != 4)
1539 ND_PRINT("invalid len");
1540 else {
1541 ND_TCHECK_4(tptr);
1542 ND_PRINT("%s", ipaddr_string(ndo, tptr));
1543 }
1544 break;
1545 case BGPTYPE_MULTI_EXIT_DISC:
1546 case BGPTYPE_LOCAL_PREF:
1547 if (len != 4)
1548 ND_PRINT("invalid len");
1549 else {
1550 ND_TCHECK_4(tptr);
1551 ND_PRINT("%u", EXTRACT_BE_U_4(tptr));
1552 }
1553 break;
1554 case BGPTYPE_ATOMIC_AGGREGATE:
1555 if (len != 0)
1556 ND_PRINT("invalid len");
1557 break;
1558 case BGPTYPE_AGGREGATOR:
1559
1560 /*
1561 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1562 * the length of this PA can be either 6 bytes or 8 bytes.
1563 */
1564 if (len != 6 && len != 8) {
1565 ND_PRINT("invalid len");
1566 break;
1567 }
1568 ND_TCHECK_LEN(tptr, len);
1569 if (len == 6) {
1570 ND_PRINT(" AS #%s, origin %s",
1571 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(tptr)),
1572 ipaddr_string(ndo, tptr + 2));
1573 } else {
1574 ND_PRINT(" AS #%s, origin %s",
1575 as_printf(ndo, astostr, sizeof(astostr),
1576 EXTRACT_BE_U_4(tptr)), ipaddr_string(ndo, tptr + 4));
1577 }
1578 break;
1579 case BGPTYPE_AGGREGATOR4:
1580 if (len != 8) {
1581 ND_PRINT("invalid len");
1582 break;
1583 }
1584 ND_TCHECK_8(tptr);
1585 ND_PRINT(" AS #%s, origin %s",
1586 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr)),
1587 ipaddr_string(ndo, tptr + 4));
1588 break;
1589 case BGPTYPE_COMMUNITIES:
1590 if (len % 4) {
1591 ND_PRINT("invalid len");
1592 break;
1593 }
1594 while (tlen != 0) {
1595 uint32_t comm;
1596 ND_TCHECK_4(tptr);
1597 if (tlen < 4)
1598 goto trunc;
1599 comm = EXTRACT_BE_U_4(tptr);
1600 switch (comm) {
1601 case BGP_COMMUNITY_NO_EXPORT:
1602 ND_PRINT(" NO_EXPORT");
1603 break;
1604 case BGP_COMMUNITY_NO_ADVERT:
1605 ND_PRINT(" NO_ADVERTISE");
1606 break;
1607 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1608 ND_PRINT(" NO_EXPORT_SUBCONFED");
1609 break;
1610 default:
1611 ND_PRINT("%u:%u%s",
1612 (comm >> 16) & 0xffff,
1613 comm & 0xffff,
1614 (tlen>4) ? ", " : "");
1615 break;
1616 }
1617 tlen -=4;
1618 tptr +=4;
1619 }
1620 break;
1621 case BGPTYPE_ORIGINATOR_ID:
1622 if (len != 4) {
1623 ND_PRINT("invalid len");
1624 break;
1625 }
1626 ND_TCHECK_4(tptr);
1627 ND_PRINT("%s",ipaddr_string(ndo, tptr));
1628 break;
1629 case BGPTYPE_CLUSTER_LIST:
1630 if (len % 4) {
1631 ND_PRINT("invalid len");
1632 break;
1633 }
1634 while (tlen != 0) {
1635 ND_TCHECK_4(tptr);
1636 if (tlen < 4)
1637 goto trunc;
1638 ND_PRINT("%s%s",
1639 ipaddr_string(ndo, tptr),
1640 (tlen>4) ? ", " : "");
1641 tlen -=4;
1642 tptr +=4;
1643 }
1644 break;
1645 case BGPTYPE_MP_REACH_NLRI:
1646 ND_TCHECK_3(tptr);
1647 if (tlen < 3)
1648 goto trunc;
1649 af = EXTRACT_BE_U_2(tptr);
1650 safi = EXTRACT_U_1(tptr + 2);
1651
1652 ND_PRINT("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1653 tok2str(af_values, "Unknown AFI", af),
1654 af,
1655 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1656 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1657 safi);
1658
1659 switch(af<<8 | safi) {
1660 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1661 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1662 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1663 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1664 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1665 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1666 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1667 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1668 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1669 case (AFNUM_INET<<8 | SAFNUM_MDT):
1670 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1671 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1672 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1673 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1674 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1675 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1676 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1677 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1678 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1679 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1680 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1681 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1682 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1683 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1684 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1685 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1686 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1687 break;
1688 default:
1689 ND_TCHECK_LEN(tptr, tlen);
1690 ND_PRINT("\n\t no AFI %u / SAFI %u decoder", af, safi);
1691 if (ndo->ndo_vflag <= 1)
1692 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1693 goto done;
1694 break;
1695 }
1696
1697 tptr +=3;
1698
1699 ND_TCHECK_1(tptr);
1700 nhlen = EXTRACT_U_1(tptr);
1701 tlen = nhlen;
1702 tptr++;
1703
1704 if (tlen) {
1705 u_int nnh = 0;
1706 ND_PRINT("\n\t nexthop: ");
1707 while (tlen != 0) {
1708 if (nnh++ > 0) {
1709 ND_PRINT(", " );
1710 }
1711 switch(af<<8 | safi) {
1712 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1713 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1714 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1715 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1716 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1717 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1718 case (AFNUM_INET<<8 | SAFNUM_MDT):
1719 if (tlen < sizeof(nd_ipv4)) {
1720 ND_PRINT("invalid len");
1721 tlen = 0;
1722 } else {
1723 ND_TCHECK_LEN(tptr, sizeof(nd_ipv4));
1724 ND_PRINT("%s",ipaddr_string(ndo, tptr));
1725 tlen -= sizeof(nd_ipv4);
1726 tptr += sizeof(nd_ipv4);
1727 }
1728 break;
1729 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1730 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1731 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1732 if (tlen < sizeof(nd_ipv4)+BGP_VPN_RD_LEN) {
1733 ND_PRINT("invalid len");
1734 tlen = 0;
1735 } else {
1736 ND_TCHECK_LEN(tptr,
1737 sizeof(nd_ipv4) + BGP_VPN_RD_LEN);
1738 ND_PRINT("RD: %s, %s",
1739 bgp_vpn_rd_print(ndo, tptr),
1740 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN));
1741 tlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
1742 tptr += (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
1743 }
1744 break;
1745 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1746 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1747 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1748 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1749 if (tlen < sizeof(nd_ipv6)) {
1750 ND_PRINT("invalid len");
1751 tlen = 0;
1752 } else {
1753 ND_TCHECK_LEN(tptr, sizeof(nd_ipv6));
1754 ND_PRINT("%s", ip6addr_string(ndo, tptr));
1755 tlen -= sizeof(nd_ipv6);
1756 tptr += sizeof(nd_ipv6);
1757 }
1758 break;
1759 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1760 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1761 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1762 if (tlen < sizeof(nd_ipv6)+BGP_VPN_RD_LEN) {
1763 ND_PRINT("invalid len");
1764 tlen = 0;
1765 } else {
1766 ND_TCHECK_LEN(tptr,
1767 sizeof(nd_ipv6) + BGP_VPN_RD_LEN);
1768 ND_PRINT("RD: %s, %s",
1769 bgp_vpn_rd_print(ndo, tptr),
1770 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN));
1771 tlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
1772 tptr += (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
1773 }
1774 break;
1775 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1776 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1777 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1778 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1779 if (tlen < sizeof(nd_ipv4)) {
1780 ND_PRINT("invalid len");
1781 tlen = 0;
1782 } else {
1783 ND_TCHECK_LEN(tptr, sizeof(nd_ipv4));
1784 ND_PRINT("%s", ipaddr_string(ndo, tptr));
1785 tlen -= (sizeof(nd_ipv4));
1786 tptr += (sizeof(nd_ipv4));
1787 }
1788 break;
1789 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1790 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1791 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1792 ND_TCHECK_LEN(tptr, tlen);
1793 ND_PRINT("%s", isonsap_string(ndo, tptr, tlen));
1794 tptr += tlen;
1795 tlen = 0;
1796 break;
1797
1798 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1799 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1800 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1801 if (tlen < BGP_VPN_RD_LEN+1) {
1802 ND_PRINT("invalid len");
1803 tlen = 0;
1804 } else {
1805 ND_TCHECK_LEN(tptr, tlen);
1806 ND_PRINT("RD: %s, %s",
1807 bgp_vpn_rd_print(ndo, tptr),
1808 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN));
1809 /* rfc986 mapped IPv4 address ? */
1810 if (EXTRACT_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
1811 ND_PRINT(" = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4));
1812 /* rfc1888 mapped IPv6 address ? */
1813 else if (EXTRACT_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
1814 ND_PRINT(" = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3));
1815 tptr += tlen;
1816 tlen = 0;
1817 }
1818 break;
1819 default:
1820 ND_TCHECK_LEN(tptr, tlen);
1821 ND_PRINT("no AFI %u/SAFI %u decoder", af, safi);
1822 if (ndo->ndo_vflag <= 1)
1823 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1824 tptr += tlen;
1825 tlen = 0;
1826 goto done;
1827 break;
1828 }
1829 }
1830 }
1831 ND_PRINT(", nh-length: %u", nhlen);
1832 tptr += tlen;
1833
1834 ND_TCHECK_1(tptr);
1835 snpa = EXTRACT_U_1(tptr);
1836 tptr++;
1837
1838 if (snpa) {
1839 ND_PRINT("\n\t %u SNPA", snpa);
1840 for (/*nothing*/; snpa != 0; snpa--) {
1841 ND_TCHECK_1(tptr);
1842 ND_PRINT("\n\t %u bytes", EXTRACT_U_1(tptr));
1843 tptr += EXTRACT_U_1(tptr) + 1;
1844 }
1845 } else {
1846 ND_PRINT(", no SNPA");
1847 }
1848
1849 add_path4 = check_add_path(ndo, tptr, (len-(tptr - pptr)), 32);
1850 add_path6 = check_add_path(ndo, tptr, (len-(tptr - pptr)), 128);
1851
1852 while (tptr < pptr + len) {
1853 switch (af<<8 | safi) {
1854 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1855 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1856 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1857 if (add_path4) {
1858 path_id = EXTRACT_BE_U_4(tptr);
1859 tptr += 4;
1860 }
1861 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1862 if (advance == -1)
1863 ND_PRINT("\n\t (illegal prefix length)");
1864 else if (advance == -2)
1865 goto trunc;
1866 else if (advance == -3)
1867 break; /* bytes left, but not enough */
1868 else
1869 ND_PRINT("\n\t %s", buf);
1870 if (add_path4) {
1871 ND_PRINT(" Path Id: %u", path_id);
1872 }
1873 break;
1874 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1875 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1876 if (advance == -1)
1877 ND_PRINT("\n\t (illegal prefix length)");
1878 else if (advance == -2)
1879 goto trunc;
1880 else if (advance == -3)
1881 break; /* bytes left, but not enough */
1882 else
1883 ND_PRINT("\n\t %s", buf);
1884 break;
1885 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1886 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1887 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1888 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1889 if (advance == -1)
1890 ND_PRINT("\n\t (illegal prefix length)");
1891 else if (advance == -2)
1892 goto trunc;
1893 else
1894 ND_PRINT("\n\t %s", buf);
1895 break;
1896 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1897 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf));
1898 if (advance == -1)
1899 ND_PRINT("\n\t (illegal prefix length)");
1900 else if (advance == -2)
1901 goto trunc;
1902 else
1903 ND_PRINT("\n\t %s", buf);
1904 break;
1905 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1906 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1907 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1908 if (advance == -1)
1909 ND_PRINT("\n\t (illegal prefix length)");
1910 else if (advance == -2)
1911 goto trunc;
1912 else
1913 ND_PRINT("\n\t %s", buf);
1914 break;
1915
1916 case (AFNUM_INET<<8 | SAFNUM_MDT):
1917 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1918 if (advance == -1)
1919 ND_PRINT("\n\t (illegal prefix length)");
1920 else if (advance == -2)
1921 goto trunc;
1922 else
1923 ND_PRINT("\n\t %s", buf);
1924 break;
1925 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1926 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1927 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1928 if (add_path6) {
1929 path_id = EXTRACT_BE_U_4(tptr);
1930 tptr += 4;
1931 }
1932 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1933 if (advance == -1)
1934 ND_PRINT("\n\t (illegal prefix length)");
1935 else if (advance == -2)
1936 goto trunc;
1937 else if (advance == -3)
1938 break; /* bytes left, but not enough */
1939 else
1940 ND_PRINT("\n\t %s", buf);
1941 if (add_path6) {
1942 ND_PRINT(" Path Id: %u", path_id);
1943 }
1944 break;
1945 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1946 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1947 if (advance == -1)
1948 ND_PRINT("\n\t (illegal prefix length)");
1949 else if (advance == -2)
1950 goto trunc;
1951 else if (advance == -3)
1952 break; /* bytes left, but not enough */
1953 else
1954 ND_PRINT("\n\t %s", buf);
1955 break;
1956 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1957 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1958 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1959 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1960 if (advance == -1)
1961 ND_PRINT("\n\t (illegal prefix length)");
1962 else if (advance == -2)
1963 goto trunc;
1964 else
1965 ND_PRINT("\n\t %s", buf);
1966 break;
1967 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1968 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1969 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1970 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1971 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1972 if (advance == -1)
1973 ND_PRINT("\n\t (illegal length)");
1974 else if (advance == -2)
1975 goto trunc;
1976 else
1977 ND_PRINT("\n\t %s", buf);
1978 break;
1979 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1980 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1981 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1982 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1983 if (advance == -1)
1984 ND_PRINT("\n\t (illegal prefix length)");
1985 else if (advance == -2)
1986 goto trunc;
1987 else
1988 ND_PRINT("\n\t %s", buf);
1989 break;
1990 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1991 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1992 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1993 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1994 if (advance == -1)
1995 ND_PRINT("\n\t (illegal prefix length)");
1996 else if (advance == -2)
1997 goto trunc;
1998 else
1999 ND_PRINT("\n\t %s", buf);
2000 break;
2001 default:
2002 ND_TCHECK_LEN(tptr, tlen);
2003 ND_PRINT("\n\t no AFI %u / SAFI %u decoder", af, safi);
2004 if (ndo->ndo_vflag <= 1)
2005 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2006 advance = 0;
2007 tptr = pptr + len;
2008 break;
2009 }
2010 if (advance < 0)
2011 break;
2012 tptr += advance;
2013 }
2014 done:
2015 break;
2016
2017 case BGPTYPE_MP_UNREACH_NLRI:
2018 ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
2019 af = EXTRACT_BE_U_2(tptr);
2020 safi = EXTRACT_U_1(tptr + 2);
2021
2022 ND_PRINT("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
2023 tok2str(af_values, "Unknown AFI", af),
2024 af,
2025 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
2026 tok2str(bgp_safi_values, "Unknown SAFI", safi),
2027 safi);
2028
2029 if (len == BGP_MP_NLRI_MINSIZE)
2030 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2031
2032 tptr += 3;
2033
2034 add_path4 = check_add_path(ndo, tptr, (len-(tptr - pptr)), 32);
2035 add_path6 = check_add_path(ndo, tptr, (len-(tptr - pptr)), 128);
2036
2037 while (tptr < pptr + len) {
2038 switch (af<<8 | safi) {
2039 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
2040 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
2041 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
2042 if (add_path4) {
2043 path_id = EXTRACT_BE_U_4(tptr);
2044 tptr += 4;
2045 }
2046 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
2047 if (advance == -1)
2048 ND_PRINT("\n\t (illegal prefix length)");
2049 else if (advance == -2)
2050 goto trunc;
2051 else if (advance == -3)
2052 break; /* bytes left, but not enough */
2053 else
2054 ND_PRINT("\n\t %s", buf);
2055 if (add_path4) {
2056 ND_PRINT(" Path Id: %u", path_id);
2057 }
2058 break;
2059 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
2060 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
2061 if (advance == -1)
2062 ND_PRINT("\n\t (illegal prefix length)");
2063 else if (advance == -2)
2064 goto trunc;
2065 else if (advance == -3)
2066 break; /* bytes left, but not enough */
2067 else
2068 ND_PRINT("\n\t %s", buf);
2069 break;
2070 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
2071 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
2072 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
2073 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
2074 if (advance == -1)
2075 ND_PRINT("\n\t (illegal prefix length)");
2076 else if (advance == -2)
2077 goto trunc;
2078 else
2079 ND_PRINT("\n\t %s", buf);
2080 break;
2081 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
2082 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
2083 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
2084 if (add_path6) {
2085 path_id = EXTRACT_BE_U_4(tptr);
2086 tptr += 4;
2087 }
2088 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
2089 if (advance == -1)
2090 ND_PRINT("\n\t (illegal prefix length)");
2091 else if (advance == -2)
2092 goto trunc;
2093 else if (advance == -3)
2094 break; /* bytes left, but not enough */
2095 else
2096 ND_PRINT("\n\t %s", buf);
2097 if (add_path6) {
2098 ND_PRINT(" Path Id: %u", path_id);
2099 }
2100 break;
2101 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
2102 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
2103 if (advance == -1)
2104 ND_PRINT("\n\t (illegal prefix length)");
2105 else if (advance == -2)
2106 goto trunc;
2107 else if (advance == -3)
2108 break; /* bytes left, but not enough */
2109 else
2110 ND_PRINT("\n\t %s", buf);
2111 break;
2112 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
2113 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
2114 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
2115 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
2116 if (advance == -1)
2117 ND_PRINT("\n\t (illegal prefix length)");
2118 else if (advance == -2)
2119 goto trunc;
2120 else
2121 ND_PRINT("\n\t %s", buf);
2122 break;
2123 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
2124 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2125 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2126 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2127 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
2128 if (advance == -1)
2129 ND_PRINT("\n\t (illegal length)");
2130 else if (advance == -2)
2131 goto trunc;
2132 else
2133 ND_PRINT("\n\t %s", buf);
2134 break;
2135 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2136 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2137 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2138 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2139 if (advance == -1)
2140 ND_PRINT("\n\t (illegal prefix length)");
2141 else if (advance == -2)
2142 goto trunc;
2143 else
2144 ND_PRINT("\n\t %s", buf);
2145 break;
2146 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2147 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2148 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2149 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2150 if (advance == -1)
2151 ND_PRINT("\n\t (illegal prefix length)");
2152 else if (advance == -2)
2153 goto trunc;
2154 else
2155 ND_PRINT("\n\t %s", buf);
2156 break;
2157 case (AFNUM_INET<<8 | SAFNUM_MDT):
2158 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
2159 if (advance == -1)
2160 ND_PRINT("\n\t (illegal prefix length)");
2161 else if (advance == -2)
2162 goto trunc;
2163 else
2164 ND_PRINT("\n\t %s", buf);
2165 break;
2166 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
2167 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
2168 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
2169 if (advance == -1)
2170 ND_PRINT("\n\t (illegal prefix length)");
2171 else if (advance == -2)
2172 goto trunc;
2173 else
2174 ND_PRINT("\n\t %s", buf);
2175 break;
2176 default:
2177 ND_TCHECK_LEN(tptr - 3, tlen);
2178 ND_PRINT("no AFI %u / SAFI %u decoder", af, safi);
2179 if (ndo->ndo_vflag <= 1)
2180 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
2181 advance = 0;
2182 tptr = pptr + len;
2183 break;
2184 }
2185 if (advance < 0)
2186 break;
2187 tptr += advance;
2188 }
2189 break;
2190 case BGPTYPE_EXTD_COMMUNITIES:
2191 if (len % 8) {
2192 ND_PRINT("invalid len");
2193 break;
2194 }
2195 while (tlen != 0) {
2196 uint16_t extd_comm;
2197
2198 ND_TCHECK_2(tptr);
2199 if (tlen < 2)
2200 goto trunc;
2201 extd_comm=EXTRACT_BE_U_2(tptr);
2202
2203 ND_PRINT("\n\t %s (0x%04x), Flags [%s]",
2204 tok2str(bgp_extd_comm_subtype_values,
2205 "unknown extd community typecode",
2206 extd_comm),
2207 extd_comm,
2208 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm));
2209
2210 ND_TCHECK_6(tptr + 2);
2211 if (tlen < 8)
2212 goto trunc;
2213 switch(extd_comm) {
2214 case BGP_EXT_COM_RT_0:
2215 case BGP_EXT_COM_RO_0:
2216 case BGP_EXT_COM_L2VPN_RT_0:
2217 ND_PRINT(": %u:%u (= %s)",
2218 EXTRACT_BE_U_2(tptr + 2),
2219 EXTRACT_BE_U_4(tptr + 4),
2220 ipaddr_string(ndo, tptr+4));
2221 break;
2222 case BGP_EXT_COM_RT_1:
2223 case BGP_EXT_COM_RO_1:
2224 case BGP_EXT_COM_L2VPN_RT_1:
2225 case BGP_EXT_COM_VRF_RT_IMP:
2226 ND_PRINT(": %s:%u",
2227 ipaddr_string(ndo, tptr+2),
2228 EXTRACT_BE_U_2(tptr + 6));
2229 break;
2230 case BGP_EXT_COM_RT_2:
2231 case BGP_EXT_COM_RO_2:
2232 ND_PRINT(": %s:%u",
2233 as_printf(ndo, astostr, sizeof(astostr),
2234 EXTRACT_BE_U_4(tptr + 2)), EXTRACT_BE_U_2(tptr + 6));
2235 break;
2236 case BGP_EXT_COM_LINKBAND:
2237 bw.i = EXTRACT_BE_U_4(tptr + 2);
2238 ND_PRINT(": bandwidth: %.3f Mbps",
2239 bw.f*8/1000000);
2240 break;
2241 case BGP_EXT_COM_VPN_ORIGIN:
2242 case BGP_EXT_COM_VPN_ORIGIN2:
2243 case BGP_EXT_COM_VPN_ORIGIN3:
2244 case BGP_EXT_COM_VPN_ORIGIN4:
2245 case BGP_EXT_COM_OSPF_RID:
2246 case BGP_EXT_COM_OSPF_RID2:
2247 ND_PRINT("%s", ipaddr_string(ndo, tptr+2));
2248 break;
2249 case BGP_EXT_COM_OSPF_RTYPE:
2250 case BGP_EXT_COM_OSPF_RTYPE2:
2251 ND_PRINT(": area:%s, router-type:%s, metric-type:%s%s",
2252 ipaddr_string(ndo, tptr+2),
2253 tok2str(bgp_extd_comm_ospf_rtype_values,
2254 "unknown (0x%02x)",
2255 EXTRACT_U_1((tptr + 6))),
2256 (EXTRACT_U_1(tptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2257 ((EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_EXT) || (EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "");
2258 break;
2259 case BGP_EXT_COM_L2INFO:
2260 ND_PRINT(": %s Control Flags [0x%02x]:MTU %u",
2261 tok2str(l2vpn_encaps_values,
2262 "unknown encaps",
2263 EXTRACT_U_1((tptr + 2))),
2264 EXTRACT_U_1((tptr + 3)),
2265 EXTRACT_BE_U_2(tptr + 4));
2266 break;
2267 case BGP_EXT_COM_SOURCE_AS:
2268 ND_PRINT(": AS %u", EXTRACT_BE_U_2(tptr + 2));
2269 break;
2270 default:
2271 ND_TCHECK_8(tptr);
2272 print_unknown_data(ndo, tptr, "\n\t ", 8);
2273 break;
2274 }
2275 tlen -= 8;
2276 tptr += 8;
2277 }
2278 break;
2279
2280 case BGPTYPE_PMSI_TUNNEL:
2281 {
2282 uint8_t tunnel_type, flags;
2283
2284 ND_TCHECK_5(tptr);
2285 if (tlen < 5)
2286 goto trunc;
2287 flags = EXTRACT_U_1(tptr);
2288 tunnel_type = EXTRACT_U_1(tptr + 1);
2289 tlen = len;
2290
2291 ND_PRINT("\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2292 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2293 tunnel_type,
2294 bittok2str(bgp_pmsi_flag_values, "none", flags),
2295 EXTRACT_BE_U_3(tptr + 2)>>4);
2296
2297 tptr +=5;
2298 tlen -= 5;
2299
2300 switch (tunnel_type) {
2301 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2302 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2303 ND_TCHECK_8(tptr);
2304 ND_PRINT("\n\t Sender %s, P-Group %s",
2305 ipaddr_string(ndo, tptr),
2306 ipaddr_string(ndo, tptr+4));
2307 break;
2308
2309 case BGP_PMSI_TUNNEL_PIM_SSM:
2310 ND_TCHECK_8(tptr);
2311 ND_PRINT("\n\t Root-Node %s, P-Group %s",
2312 ipaddr_string(ndo, tptr),
2313 ipaddr_string(ndo, tptr+4));
2314 break;
2315 case BGP_PMSI_TUNNEL_INGRESS:
2316 ND_TCHECK_4(tptr);
2317 ND_PRINT("\n\t Tunnel-Endpoint %s",
2318 ipaddr_string(ndo, tptr));
2319 break;
2320 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2321 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2322 ND_TCHECK_8(tptr);
2323 ND_PRINT("\n\t Root-Node %s, LSP-ID 0x%08x",
2324 ipaddr_string(ndo, tptr),
2325 EXTRACT_BE_U_4(tptr + 4));
2326 break;
2327 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2328 ND_TCHECK_8(tptr);
2329 ND_PRINT("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2330 ipaddr_string(ndo, tptr),
2331 EXTRACT_BE_U_4(tptr + 4));
2332 break;
2333 default:
2334 if (ndo->ndo_vflag <= 1) {
2335 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2336 }
2337 }
2338 break;
2339 }
2340 case BGPTYPE_AIGP:
2341 {
2342 uint8_t type;
2343 uint16_t length;
2344
2345 tlen = len;
2346
2347 while (tlen >= 3) {
2348
2349 ND_TCHECK_3(tptr);
2350
2351 type = EXTRACT_U_1(tptr);
2352 length = EXTRACT_BE_U_2(tptr + 1);
2353 tptr += 3;
2354 tlen -= 3;
2355
2356 ND_PRINT("\n\t %s TLV (%u), length %u",
2357 tok2str(bgp_aigp_values, "Unknown", type),
2358 type, length);
2359
2360 if (length < 3)
2361 goto trunc;
2362 length -= 3;
2363
2364 /*
2365 * Check if we can read the TLV data.
2366 */
2367 ND_TCHECK_LEN(tptr + 3, length);
2368 if (tlen < length)
2369 goto trunc;
2370
2371 switch (type) {
2372
2373 case BGP_AIGP_TLV:
2374 if (length < 8)
2375 goto trunc;
2376 ND_PRINT(", metric %" PRIu64,
2377 EXTRACT_BE_U_8(tptr));
2378 break;
2379
2380 default:
2381 if (ndo->ndo_vflag <= 1) {
2382 print_unknown_data(ndo, tptr,"\n\t ", length);
2383 }
2384 }
2385
2386 tptr += length;
2387 tlen -= length;
2388 }
2389 break;
2390 }
2391 case BGPTYPE_ATTR_SET:
2392 ND_TCHECK_4(tptr);
2393 if (len < 4)
2394 goto trunc;
2395 ND_PRINT("\n\t Origin AS: %s",
2396 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr)));
2397 tptr += 4;
2398 len -= 4;
2399
2400 while (len) {
2401 u_int aflags, alenlen, alen;
2402
2403 ND_TCHECK_2(tptr);
2404 if (len < 2) {
2405 ND_PRINT(" [path attr too short]");
2406 tptr += len;
2407 break;
2408 }
2409 aflags = EXTRACT_U_1(tptr);
2410 atype = EXTRACT_U_1(tptr + 1);
2411 tptr += 2;
2412 len -= 2;
2413 alenlen = bgp_attr_lenlen(aflags, tptr);
2414 ND_TCHECK_LEN(tptr, alenlen);
2415 if (len < alenlen) {
2416 ND_PRINT(" [path attr too short]");
2417 tptr += len;
2418 break;
2419 }
2420 alen = bgp_attr_len(aflags, tptr);
2421 tptr += alenlen;
2422 len -= alenlen;
2423
2424 ND_PRINT("\n\t %s (%u), length: %u",
2425 tok2str(bgp_attr_values,
2426 "Unknown Attribute", atype),
2427 atype,
2428 alen);
2429
2430 if (aflags) {
2431 ND_PRINT(", Flags [%s%s%s%s",
2432 aflags & 0x80 ? "O" : "",
2433 aflags & 0x40 ? "T" : "",
2434 aflags & 0x20 ? "P" : "",
2435 aflags & 0x10 ? "E" : "");
2436 if (aflags & 0xf)
2437 ND_PRINT("+%x", aflags & 0xf);
2438 ND_PRINT("]");
2439 }
2440 ND_PRINT(": ");
2441 if (len < alen) {
2442 ND_PRINT(" [path attr too short]");
2443 tptr += len;
2444 break;
2445 }
2446 /* FIXME check for recursion */
2447 if (!bgp_attr_print(ndo, atype, tptr, alen))
2448 return 0;
2449 tptr += alen;
2450 len -= alen;
2451 }
2452 break;
2453
2454 case BGPTYPE_LARGE_COMMUNITY:
2455 if (len == 0 || len % 12) {
2456 ND_PRINT("invalid len");
2457 break;
2458 }
2459 ND_PRINT("\n\t ");
2460 while (len != 0) {
2461 ND_TCHECK_LEN(tptr, 12);
2462 ND_PRINT("%u:%u:%u%s",
2463 EXTRACT_BE_U_4(tptr),
2464 EXTRACT_BE_U_4(tptr + 4),
2465 EXTRACT_BE_U_4(tptr + 8),
2466 (len > 12) ? ", " : "");
2467 tptr += 12;
2468 /*
2469 * len will always be a multiple of 12, as per the above,
2470 * so this will never underflow.
2471 */
2472 len -= 12;
2473 }
2474 break;
2475 default:
2476 ND_TCHECK_LEN(pptr, len);
2477 ND_PRINT("\n\t no Attribute %u decoder", atype); /* we have no decoder for the attribute */
2478 if (ndo->ndo_vflag <= 1)
2479 print_unknown_data(ndo, pptr, "\n\t ", len);
2480 break;
2481 }
2482 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2483 ND_TCHECK_LEN(pptr, len);
2484 print_unknown_data(ndo, pptr, "\n\t ", len);
2485 }
2486 return 1;
2487
2488 trunc:
2489 return 0;
2490 }
2491
2492 static void
2493 bgp_capabilities_print(netdissect_options *ndo,
2494 const u_char *opt, u_int caps_len)
2495 {
2496 u_int cap_type, cap_len, tcap_len, cap_offset;
2497 u_int i = 0;
2498
2499 while (i < caps_len) {
2500 ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
2501 cap_type=EXTRACT_U_1(opt + i);
2502 cap_len=EXTRACT_U_1(opt + i + 1);
2503 ND_PRINT("\n\t %s (%u), length: %u",
2504 tok2str(bgp_capcode_values, "Unknown", cap_type),
2505 cap_type,
2506 cap_len);
2507 ND_TCHECK_LEN(opt + 2 + i, cap_len);
2508 switch (cap_type) {
2509 case BGP_CAPCODE_MP:
2510 if (cap_len < 4) {
2511 ND_PRINT(" (too short, < 4)");
2512 return;
2513 }
2514 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u)",
2515 tok2str(af_values, "Unknown", EXTRACT_BE_U_2(opt + i + 2)),
2516 EXTRACT_BE_U_2(opt + i + 2),
2517 tok2str(bgp_safi_values, "Unknown", EXTRACT_U_1(opt + i + 5)),
2518 EXTRACT_U_1(opt + i + 5));
2519 break;
2520 case BGP_CAPCODE_RESTART:
2521 if (cap_len < 2) {
2522 ND_PRINT(" (too short, < 2)");
2523 return;
2524 }
2525 tcap_len=cap_len;
2526 ND_PRINT("\n\t\tRestart Flags: [%s], Restart Time %us",
2527 ((EXTRACT_U_1(opt + i + 2))&0x80) ? "R" : "none",
2528 EXTRACT_BE_U_2(opt + i + 2)&0xfff);
2529 tcap_len-=2;
2530 cap_offset=4;
2531 while(tcap_len>=4) {
2532 ND_PRINT("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2533 tok2str(af_values,"Unknown",
2534 EXTRACT_BE_U_2(opt + i + cap_offset)),
2535 EXTRACT_BE_U_2(opt + i + cap_offset),
2536 tok2str(bgp_safi_values,"Unknown",
2537 EXTRACT_U_1(opt + i + cap_offset + 2)),
2538 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2539 ((EXTRACT_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" );
2540 tcap_len -= 4;
2541 cap_offset += 4;
2542 }
2543 break;
2544 case BGP_CAPCODE_RR:
2545 case BGP_CAPCODE_RR_CISCO:
2546 break;
2547 case BGP_CAPCODE_AS_NEW:
2548 /*
2549 * Extract the 4 byte AS number encoded.
2550 */
2551 if (cap_len < 4) {
2552 ND_PRINT(" (too short, < 4)");
2553 return;
2554 }
2555 ND_PRINT("\n\t\t 4 Byte AS %s",
2556 as_printf(ndo, astostr, sizeof(astostr),
2557 EXTRACT_BE_U_4(opt + i + 2)));
2558 break;
2559 case BGP_CAPCODE_ADD_PATH:
2560 if (cap_len == 0) {
2561 ND_PRINT(" (bogus)"); /* length */
2562 break;
2563 }
2564 tcap_len=cap_len;
2565 cap_offset=2;
2566 while (tcap_len != 0) {
2567 if (tcap_len < 4) {
2568 ND_PRINT("\n\t\t(invalid)");
2569 break;
2570 }
2571 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2572 tok2str(af_values,"Unknown",EXTRACT_BE_U_2(opt + i + cap_offset)),
2573 EXTRACT_BE_U_2(opt + i + cap_offset),
2574 tok2str(bgp_safi_values,"Unknown",EXTRACT_U_1(opt + i + cap_offset + 2)),
2575 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2576 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",EXTRACT_U_1(opt + i + cap_offset + 3))
2577 );
2578 tcap_len -= 4;
2579 cap_offset += 4;
2580 }
2581 break;
2582 default:
2583 ND_PRINT("\n\t\tno decoder for Capability %u",
2584 cap_type);
2585 if (ndo->ndo_vflag <= 1)
2586 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2587 cap_len);
2588 break;
2589 }
2590 if (ndo->ndo_vflag > 1 && cap_len != 0) {
2591 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2592 }
2593 i += BGP_CAP_HEADER_SIZE + cap_len;
2594 }
2595 return;
2596
2597 trunc:
2598 ND_PRINT("[|BGP]");
2599 }
2600
2601 static void
2602 bgp_open_print(netdissect_options *ndo,
2603 const u_char *dat, u_int length)
2604 {
2605 const struct bgp_open *bgp_open_header;
2606 u_int optslen;
2607 const struct bgp_opt *bgpopt;
2608 const u_char *opt;
2609 u_int i;
2610
2611 ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
2612 if (length < BGP_OPEN_SIZE)
2613 goto trunc;
2614
2615 bgp_open_header = (const struct bgp_open *)dat;
2616
2617 ND_PRINT("\n\t Version %u, ",
2618 EXTRACT_U_1(bgp_open_header->bgpo_version));
2619 ND_PRINT("my AS %s, ",
2620 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(bgp_open_header->bgpo_myas)));
2621 ND_PRINT("Holdtime %us, ",
2622 EXTRACT_BE_U_2(bgp_open_header->bgpo_holdtime));
2623 ND_PRINT("ID %s", ipaddr_string(ndo, bgp_open_header->bgpo_id));
2624 optslen = EXTRACT_U_1(bgp_open_header->bgpo_optlen);
2625 ND_PRINT("\n\t Optional parameters, length: %u", optslen);
2626
2627 opt = dat + BGP_OPEN_SIZE;
2628 length -= BGP_OPEN_SIZE;
2629
2630 i = 0;
2631 while (i < optslen) {
2632 uint8_t opt_type, opt_len;
2633
2634 ND_TCHECK_LEN(opt + i, BGP_OPT_SIZE);
2635 if (length < BGP_OPT_SIZE + i)
2636 goto trunc;
2637 bgpopt = (const struct bgp_opt *)(opt + i);
2638 opt_type = EXTRACT_U_1(bgpopt->bgpopt_type);
2639 opt_len = EXTRACT_U_1(bgpopt->bgpopt_len);
2640 if (BGP_OPT_SIZE + i + opt_len > optslen) {
2641 ND_PRINT("\n\t Option %u, length: %u, goes past the end of the options",
2642 opt_type, opt_len);
2643 break;
2644 }
2645
2646 ND_PRINT("\n\t Option %s (%u), length: %u",
2647 tok2str(bgp_opt_values,"Unknown",opt_type),
2648 opt_type,
2649 opt_len);
2650
2651 /* now let's decode the options we know*/
2652 switch(opt_type) {
2653
2654 case BGP_OPT_CAP:
2655 bgp_capabilities_print(ndo, opt + BGP_OPT_SIZE + i,
2656 opt_len);
2657 break;
2658
2659 case BGP_OPT_AUTH:
2660 default:
2661 ND_PRINT("\n\t no decoder for option %u",
2662 opt_type);
2663 break;
2664 }
2665 i += BGP_OPT_SIZE + opt_len;
2666 }
2667 return;
2668 trunc:
2669 ND_PRINT("[|BGP]");
2670 }
2671
2672 static void
2673 bgp_update_print(netdissect_options *ndo,
2674 const u_char *dat, u_int length)
2675 {
2676 const u_char *p;
2677 u_int withdrawn_routes_len;
2678 char buf[MAXHOSTNAMELEN + 100];
2679 int wpfx;
2680 u_int len;
2681 int i;
2682 int add_path;
2683 u_int path_id = 0;
2684
2685 ND_TCHECK_LEN(dat, BGP_SIZE);
2686 if (length < BGP_SIZE)
2687 goto trunc;
2688 p = dat + BGP_SIZE;
2689 length -= BGP_SIZE;
2690
2691 /* Unfeasible routes */
2692 ND_TCHECK_2(p);
2693 if (length < 2)
2694 goto trunc;
2695 withdrawn_routes_len = EXTRACT_BE_U_2(p);
2696 p += 2;
2697 length -= 2;
2698 if (withdrawn_routes_len > 1) {
2699 /*
2700 * Without keeping state from the original NLRI message,
2701 * it's not possible to tell if this a v4 or v6 route,
2702 * so only try to decode it if we're not v6 enabled.
2703 */
2704 ND_TCHECK_LEN(p, withdrawn_routes_len);
2705 if (length < withdrawn_routes_len)
2706 goto trunc;
2707 ND_PRINT("\n\t Withdrawn routes:");
2708 add_path = check_add_path(ndo, p, withdrawn_routes_len, 32);
2709 while (withdrawn_routes_len != 0) {
2710 if (add_path) {
2711 if (withdrawn_routes_len < 4) {
2712 p += withdrawn_routes_len;
2713 length -= withdrawn_routes_len;
2714 break;
2715 }
2716 path_id = EXTRACT_BE_U_4(p);
2717 p += 4;
2718 length -= 4;
2719 withdrawn_routes_len -= 4;
2720 }
2721 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
2722 if (wpfx == -1) {
2723 ND_PRINT("\n\t (illegal prefix length)");
2724 break;
2725 } else if (wpfx == -2)
2726 goto trunc;
2727 else if (wpfx == -3)
2728 goto trunc; /* bytes left, but not enough */
2729 else {
2730 ND_PRINT("\n\t %s", buf);
2731 if (add_path) {
2732 ND_PRINT(" Path Id: %u", path_id);
2733 }
2734 p += wpfx;
2735 length -= wpfx;
2736 withdrawn_routes_len -= wpfx;
2737 }
2738 }
2739 } else {
2740 ND_TCHECK_LEN(p, withdrawn_routes_len);
2741 if (length < withdrawn_routes_len)
2742 goto trunc;
2743 p += withdrawn_routes_len;
2744 length -= withdrawn_routes_len;
2745 }
2746
2747 ND_TCHECK_2(p);
2748 if (length < 2)
2749 goto trunc;
2750 len = EXTRACT_BE_U_2(p);
2751 p += 2;
2752 length -= 2;
2753
2754 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2755 /* No withdrawn routes, no path attributes, no NLRI */
2756 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2757 return;
2758 }
2759
2760 if (len) {
2761 /* do something more useful!*/
2762 while (len) {
2763 u_int aflags, atype, alenlen, alen;
2764
2765 ND_TCHECK_2(p);
2766 if (length < 2)
2767 goto trunc;
2768 if (len < 2) {
2769 ND_PRINT("\n\t [path attrs too short]");
2770 p += len;
2771 length -= len;
2772 break;
2773 }
2774 aflags = EXTRACT_U_1(p);
2775 atype = EXTRACT_U_1(p + 1);
2776 p += 2;
2777 len -= 2;
2778 length -= 2;
2779 alenlen = bgp_attr_lenlen(aflags, p);
2780 ND_TCHECK_LEN(p, alenlen);
2781 if (length < alenlen)
2782 goto trunc;
2783 if (len < alenlen) {
2784 ND_PRINT("\n\t [path attrs too short]");
2785 p += len;
2786 length -= len;
2787 break;
2788 }
2789 alen = bgp_attr_len(aflags, p);
2790 p += alenlen;
2791 len -= alenlen;
2792 length -= alenlen;
2793
2794 ND_PRINT("\n\t %s (%u), length: %u",
2795 tok2str(bgp_attr_values, "Unknown Attribute", atype),
2796 atype,
2797 alen);
2798
2799 if (aflags) {
2800 ND_PRINT(", Flags [%s%s%s%s",
2801 aflags & 0x80 ? "O" : "",
2802 aflags & 0x40 ? "T" : "",
2803 aflags & 0x20 ? "P" : "",
2804 aflags & 0x10 ? "E" : "");
2805 if (aflags & 0xf)
2806 ND_PRINT("+%x", aflags & 0xf);
2807 ND_PRINT("]: ");
2808 }
2809 if (len < alen) {
2810 ND_PRINT(" [path attrs too short]");
2811 p += len;
2812 length -= len;
2813 break;
2814 }
2815 if (length < alen)
2816 goto trunc;
2817 if (!bgp_attr_print(ndo, atype, p, alen))
2818 goto trunc;
2819 p += alen;
2820 len -= alen;
2821 length -= alen;
2822 }
2823 }
2824
2825 if (length) {
2826 add_path = check_add_path(ndo, p, length, 32);
2827 ND_PRINT("\n\t Updated routes:");
2828 while (length != 0) {
2829 if (add_path) {
2830 ND_TCHECK_4(p);
2831 if (length < 4)
2832 goto trunc;
2833 path_id = EXTRACT_BE_U_4(p);
2834 p += 4;
2835 length -= 4;
2836 }
2837 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2838 if (i == -1) {
2839 ND_PRINT("\n\t (illegal prefix length)");
2840 break;
2841 } else if (i == -2)
2842 goto trunc;
2843 else if (i == -3)
2844 goto trunc; /* bytes left, but not enough */
2845 else {
2846 ND_PRINT("\n\t %s", buf);
2847 if (add_path) {
2848 ND_PRINT(" Path Id: %u", path_id);
2849 }
2850 p += i;
2851 length -= i;
2852 }
2853 }
2854 }
2855 return;
2856 trunc:
2857 ND_PRINT("[|BGP]");
2858 }
2859
2860 static void
2861 bgp_notification_print(netdissect_options *ndo,
2862 const u_char *dat, u_int length)
2863 {
2864 const struct bgp_notification *bgp_notification_header;
2865 const u_char *tptr;
2866 uint8_t bgpn_major, bgpn_minor;
2867 uint8_t shutdown_comm_length;
2868 uint8_t remainder_offset;
2869
2870 ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
2871 if (length<BGP_NOTIFICATION_SIZE)
2872 return;
2873
2874 bgp_notification_header = (const struct bgp_notification *)dat;
2875 bgpn_major = EXTRACT_U_1(bgp_notification_header->bgpn_major);
2876 bgpn_minor = EXTRACT_U_1(bgp_notification_header->bgpn_minor);
2877
2878 ND_PRINT(", %s (%u)",
2879 tok2str(bgp_notify_major_values, "Unknown Error",
2880 bgpn_major),
2881 bgpn_major);
2882
2883 switch (bgpn_major) {
2884
2885 case BGP_NOTIFY_MAJOR_MSG:
2886 ND_PRINT(", subcode %s (%u)",
2887 tok2str(bgp_notify_minor_msg_values, "Unknown",
2888 bgpn_minor),
2889 bgpn_minor);
2890 break;
2891 case BGP_NOTIFY_MAJOR_OPEN:
2892 ND_PRINT(", subcode %s (%u)",
2893 tok2str(bgp_notify_minor_open_values, "Unknown",
2894 bgpn_minor),
2895 bgpn_minor);
2896 break;
2897 case BGP_NOTIFY_MAJOR_UPDATE:
2898 ND_PRINT(", subcode %s (%u)",
2899 tok2str(bgp_notify_minor_update_values, "Unknown",
2900 bgpn_minor),
2901 bgpn_minor);
2902 break;
2903 case BGP_NOTIFY_MAJOR_FSM:
2904 ND_PRINT(" subcode %s (%u)",
2905 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2906 bgpn_minor),
2907 bgpn_minor);
2908 break;
2909 case BGP_NOTIFY_MAJOR_CAP:
2910 ND_PRINT(" subcode %s (%u)",
2911 tok2str(bgp_notify_minor_cap_values, "Unknown",
2912 bgpn_minor),
2913 bgpn_minor);
2914 break;
2915 case BGP_NOTIFY_MAJOR_CEASE:
2916 ND_PRINT(", subcode %s (%u)",
2917 tok2str(bgp_notify_minor_cease_values, "Unknown",
2918 bgpn_minor),
2919 bgpn_minor);
2920
2921 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2922 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2923 */
2924 if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2925 tptr = dat + BGP_NOTIFICATION_SIZE;
2926 ND_TCHECK_7(tptr);
2927 ND_PRINT(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2928 tok2str(af_values, "Unknown", EXTRACT_BE_U_2(tptr)),
2929 EXTRACT_BE_U_2(tptr),
2930 tok2str(bgp_safi_values, "Unknown", EXTRACT_U_1((tptr + 2))),
2931 EXTRACT_U_1((tptr + 2)),
2932 EXTRACT_BE_U_4(tptr + 3));
2933 }
2934 /*
2935 * draft-ietf-idr-shutdown describes a method to send a communication
2936 * intended for human consumption regarding the Administrative Shutdown
2937 */
2938 if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
2939 bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
2940 length >= BGP_NOTIFICATION_SIZE + 1) {
2941 tptr = dat + BGP_NOTIFICATION_SIZE;
2942 ND_TCHECK_1(tptr);
2943 shutdown_comm_length = EXTRACT_U_1(tptr);
2944 remainder_offset = 0;
2945 /* garbage, hexdump it all */
2946 if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN ||
2947 shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) {
2948 ND_PRINT(", invalid Shutdown Communication length");
2949 }
2950 else if (shutdown_comm_length == 0) {
2951 ND_PRINT(", empty Shutdown Communication");
2952 remainder_offset += 1;
2953 }
2954 /* a proper shutdown communication */
2955 else {
2956 ND_TCHECK_LEN(tptr + 1, shutdown_comm_length);
2957 ND_PRINT(", Shutdown Communication (length: %u): \"", shutdown_comm_length);
2958 (void)fn_printn(ndo, tptr+1, shutdown_comm_length, NULL);
2959 ND_PRINT("\"");
2960 remainder_offset += shutdown_comm_length + 1;
2961 }
2962 /* if there is trailing data, hexdump it */
2963 if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) {
2964 ND_PRINT(", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2965 hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2966 }
2967 }
2968 break;
2969 default:
2970 break;
2971 }
2972
2973 return;
2974 trunc:
2975 ND_PRINT("[|BGP]");
2976 }
2977
2978 static void
2979 bgp_route_refresh_print(netdissect_options *ndo,
2980 const u_char *pptr, u_int len)
2981 {
2982 const struct bgp_route_refresh *bgp_route_refresh_header;
2983
2984 ND_TCHECK_LEN(pptr, BGP_ROUTE_REFRESH_SIZE);
2985
2986 /* some little sanity checking */
2987 if (len<BGP_ROUTE_REFRESH_SIZE)
2988 return;
2989
2990 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2991
2992 ND_PRINT("\n\t AFI %s (%u), SAFI %s (%u)",
2993 tok2str(af_values,"Unknown",
2994 EXTRACT_BE_U_2(bgp_route_refresh_header->afi)),
2995 EXTRACT_BE_U_2(bgp_route_refresh_header->afi),
2996 tok2str(bgp_safi_values,"Unknown",
2997 EXTRACT_U_1(bgp_route_refresh_header->safi)),
2998 EXTRACT_U_1(bgp_route_refresh_header->safi));
2999
3000 if (ndo->ndo_vflag > 1) {
3001 ND_TCHECK_LEN(pptr, len);
3002 print_unknown_data(ndo, pptr, "\n\t ", len);
3003 }
3004
3005 return;
3006 trunc:
3007 ND_PRINT("[|BGP]");
3008 }
3009
3010 static int
3011 bgp_pdu_print(netdissect_options *ndo,
3012 const u_char *dat, u_int length)
3013 {
3014 const struct bgp *bgp_header;
3015 uint8_t bgp_type;
3016
3017 ND_TCHECK_LEN(dat, BGP_SIZE);
3018 bgp_header = (const struct bgp *)dat;
3019 bgp_type = EXTRACT_U_1(bgp_header->bgp_type);
3020
3021 ND_PRINT("\n\t%s Message (%u), length: %u",
3022 tok2str(bgp_msg_values, "Unknown", bgp_type),
3023 bgp_type,
3024 length);
3025
3026 switch (bgp_type) {
3027 case BGP_OPEN:
3028 bgp_open_print(ndo, dat, length);
3029 break;
3030 case BGP_UPDATE:
3031 bgp_update_print(ndo, dat, length);
3032 break;
3033 case BGP_NOTIFICATION:
3034 bgp_notification_print(ndo, dat, length);
3035 break;
3036 case BGP_KEEPALIVE:
3037 break;
3038 case BGP_ROUTE_REFRESH:
3039 bgp_route_refresh_print(ndo, dat, length);
3040 break;
3041 default:
3042 /* we have no decoder for the BGP message */
3043 ND_TCHECK_LEN(dat, length);
3044 ND_PRINT("\n\t no Message %u decoder", bgp_type);
3045 print_unknown_data(ndo, dat, "\n\t ", length);
3046 break;
3047 }
3048 return 1;
3049 trunc:
3050 ND_PRINT("[|BGP]");
3051 return 0;
3052 }
3053
3054 void
3055 bgp_print(netdissect_options *ndo,
3056 const u_char *dat, u_int length _U_)
3057 {
3058 const u_char *p;
3059 const u_char *ep = ndo->ndo_snapend;
3060 const u_char *start;
3061 const u_char marker[] = {
3062 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3063 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3064 };
3065 const struct bgp *bgp_header;
3066 uint16_t hlen;
3067
3068 ndo->ndo_protocol = "bgp";
3069 ND_PRINT(": BGP");
3070
3071 if (ndo->ndo_vflag < 1) /* lets be less chatty */
3072 return;
3073
3074 p = dat;
3075 start = p;
3076 while (p < ep) {
3077 if (!ND_TTEST_1(p))
3078 break;
3079 if (EXTRACT_U_1(p) != 0xff) {
3080 p++;
3081 continue;
3082 }
3083
3084 if (!ND_TTEST_LEN(p, sizeof(marker)))
3085 break;
3086 if (memcmp(p, marker, sizeof(marker)) != 0) {
3087 p++;
3088 continue;
3089 }
3090
3091 /* found BGP header */
3092 ND_TCHECK_LEN(p, BGP_SIZE);
3093 bgp_header = (const struct bgp *)p;
3094
3095 if (start != p)
3096 ND_PRINT(" [|BGP]");
3097
3098 hlen = EXTRACT_BE_U_2(bgp_header->bgp_len);
3099 if (hlen < BGP_SIZE) {
3100 ND_PRINT("\n[|BGP Bogus header length %u < %u]", hlen,
3101 BGP_SIZE);
3102 break;
3103 }
3104
3105 if (ND_TTEST_LEN(p, hlen)) {
3106 if (!bgp_pdu_print(ndo, p, hlen))
3107 return;
3108 p += hlen;
3109 start = p;
3110 } else {
3111 ND_PRINT("\n[|BGP %s]",
3112 tok2str(bgp_msg_values,
3113 "Unknown Message Type",
3114 EXTRACT_U_1(bgp_header->bgp_type)));
3115 break;
3116 }
3117 }
3118
3119 return;
3120
3121 trunc:
3122 ND_PRINT(" [|BGP]");
3123 }
[mirror] the TCPdump network dissector