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Get rid of an unused variable.
[tcpdump] / print-bgp.c
1 /*
2 * Copyright (C) 1999 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * Extensively modified by Hannes Gredler (hannes@gredler.at) for more
30 * complete BGP support.
31 */
32
33 /* \summary: Border Gateway Protocol (BGP) printer */
34
35 /* specification: RFC 4771 */
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 snprintf(str, size, "%u", asnum);
528 } else {
529 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 snprintf(buf, buflen, "%s/%d", ipaddr_string(ndo, &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 snprintf(buf, buflen, "%s/%d, label:%u %s",
607 ipaddr_string(ndo, &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(struct in_addr) << 3): /* 32 */
637 ND_TCHECK_LEN(pptr, sizeof(struct in_addr));
638 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
639 break;
640 case (sizeof(struct in6_addr) << 3): /* 128 */
641 ND_TCHECK_LEN(pptr, sizeof(struct in6_addr));
642 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
643 break;
644 default:
645 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 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 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 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 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 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 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 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 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 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 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
847 bgp_vpn_rd_print(ndo, pptr+4),
848 ipaddr_string(ndo, &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(struct in_addr));
892 vpn_ip = pptr;
893 pptr += sizeof(struct in_addr);
894
895 /* MDT Group Address */
896 ND_TCHECK_LEN(pptr, sizeof(struct in_addr));
897
898 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 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 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 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 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 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 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 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 int plen, tlen, stringlen, tlv_type, tlv_len, ttlv_len;
1041
1042 ND_TCHECK_2(pptr);
1043 plen = EXTRACT_BE_U_2(pptr);
1044 tlen = plen;
1045 pptr += 2;
1046 /* Old and new L2VPN NLRI share AFI/SAFI
1047 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1048 * and > 17 as old format. Complain for the middle case
1049 */
1050 if (plen == 12) {
1051 /* assume AD-only with RD, BGPNH */
1052 ND_TCHECK_LEN(pptr, 12);
1053 buf[0] = '\0';
1054 stringlen = snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1055 bgp_vpn_rd_print(ndo, pptr),
1056 ipaddr_string(ndo, pptr+8));
1057 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1058 pptr += 12;
1059 tlen -= 12;
1060 return plen;
1061 } else if (plen > 17) {
1062 /* assume old format */
1063 /* RD, ID, LBLKOFF, LBLBASE */
1064
1065 ND_TCHECK_LEN(pptr, 15);
1066 buf[0] = '\0';
1067 stringlen = snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1068 bgp_vpn_rd_print(ndo, pptr),
1069 EXTRACT_BE_U_2(pptr + 8),
1070 EXTRACT_BE_U_2(pptr + 10),
1071 EXTRACT_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1072 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1073 pptr += 15;
1074 tlen -= 15;
1075
1076 /* ok now the variable part - lets read out TLVs*/
1077 while (tlen>0) {
1078 if (tlen < 3)
1079 return -1;
1080 ND_TCHECK_3(pptr);
1081 tlv_type = EXTRACT_U_1(pptr);
1082 pptr++;
1083 tlv_len = EXTRACT_BE_U_2(pptr);
1084 ttlv_len = tlv_len;
1085 pptr += 2;
1086
1087 switch(tlv_type) {
1088 case 1:
1089 if (buflen != 0) {
1090 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1091 tlv_type,
1092 tlv_len);
1093 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1094 }
1095 ttlv_len = ttlv_len/8+1; /* how many bytes do we need to read ? */
1096 while (ttlv_len > 0) {
1097 ND_TCHECK_1(pptr);
1098 if (buflen != 0) {
1099 stringlen=snprintf(buf,buflen, "%02x",
1100 EXTRACT_U_1(pptr));
1101 pptr++;
1102 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1103 }
1104 ttlv_len--;
1105 }
1106 break;
1107 default:
1108 if (buflen != 0) {
1109 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1110 tlv_type,
1111 tlv_len);
1112 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1113 }
1114 break;
1115 }
1116 tlen -= (tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
1117 }
1118 return plen + 2;
1119 } else {
1120 /* complain bitterly ? */
1121 /* fall through */
1122 goto trunc;
1123 }
1124
1125 trunc:
1126 return -2;
1127 }
1128
1129 int
1130 decode_prefix6(netdissect_options *ndo,
1131 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1132 {
1133 struct in6_addr addr;
1134 u_int plen, plenbytes;
1135
1136 ND_TCHECK_1(pd);
1137 ITEMCHECK(1);
1138 plen = EXTRACT_U_1(pd);
1139 if (128 < plen)
1140 return -1;
1141 itemlen -= 1;
1142
1143 memset(&addr, 0, sizeof(addr));
1144 plenbytes = (plen + 7) / 8;
1145 ND_TCHECK_LEN(pd + 1, plenbytes);
1146 ITEMCHECK(plenbytes);
1147 memcpy(&addr, pd + 1, plenbytes);
1148 if (plen % 8) {
1149 addr.s6_addr[plenbytes - 1] &=
1150 ((0xff00 >> (plen % 8)) & 0xff);
1151 }
1152 snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen);
1153 return 1 + plenbytes;
1154
1155 trunc:
1156 return -2;
1157
1158 badtlv:
1159 return -3;
1160 }
1161
1162 static int
1163 decode_labeled_prefix6(netdissect_options *ndo,
1164 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1165 {
1166 struct in6_addr addr;
1167 u_int plen, plenbytes;
1168
1169 /* prefix length and label = 4 bytes */
1170 ND_TCHECK_4(pptr);
1171 ITEMCHECK(4);
1172 plen = EXTRACT_U_1(pptr); /* get prefix length */
1173
1174 if (24 > plen)
1175 return -1;
1176
1177 plen -= 24; /* adjust prefixlen - labellength */
1178
1179 if (128 < plen)
1180 return -1;
1181 itemlen -= 4;
1182
1183 memset(&addr, 0, sizeof(addr));
1184 plenbytes = (plen + 7) / 8;
1185 ND_TCHECK_LEN(pptr + 4, plenbytes);
1186 memcpy(&addr, pptr + 4, plenbytes);
1187 if (plen % 8) {
1188 addr.s6_addr[plenbytes - 1] &=
1189 ((0xff00 >> (plen % 8)) & 0xff);
1190 }
1191 /* the label may get offsetted by 4 bits so lets shift it right */
1192 snprintf(buf, buflen, "%s/%d, label:%u %s",
1193 ip6addr_string(ndo, &addr),
1194 plen,
1195 EXTRACT_BE_U_3(pptr + 1)>>4,
1196 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1197
1198 return 4 + plenbytes;
1199
1200 trunc:
1201 return -2;
1202
1203 badtlv:
1204 return -3;
1205 }
1206
1207 static int
1208 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1209 const u_char *pptr, char *buf, u_int buflen)
1210 {
1211 struct in6_addr addr;
1212 u_int plen;
1213
1214 ND_TCHECK_1(pptr);
1215 plen = EXTRACT_U_1(pptr); /* get prefix length */
1216
1217 if ((24+64) > plen)
1218 return -1;
1219
1220 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1221
1222 if (128 < plen)
1223 return -1;
1224
1225 memset(&addr, 0, sizeof(addr));
1226 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1227 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1228 if (plen % 8) {
1229 addr.s6_addr[(plen + 7) / 8 - 1] &=
1230 ((0xff00 >> (plen % 8)) & 0xff);
1231 }
1232 /* the label may get offsetted by 4 bits so lets shift it right */
1233 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1234 bgp_vpn_rd_print(ndo, pptr+4),
1235 ip6addr_string(ndo, &addr),
1236 plen,
1237 EXTRACT_BE_U_3(pptr + 1)>>4,
1238 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1239
1240 return 12 + (plen + 7) / 8;
1241
1242 trunc:
1243 return -2;
1244 }
1245
1246 static int
1247 decode_clnp_prefix(netdissect_options *ndo,
1248 const u_char *pptr, char *buf, u_int buflen)
1249 {
1250 uint8_t addr[19];
1251 u_int plen;
1252
1253 ND_TCHECK_1(pptr);
1254 plen = EXTRACT_U_1(pptr); /* get prefix length */
1255
1256 if (152 < plen)
1257 return -1;
1258
1259 memset(&addr, 0, sizeof(addr));
1260 ND_TCHECK_LEN(pptr + 4, (plen + 7) / 8);
1261 memcpy(&addr, pptr + 4, (plen + 7) / 8);
1262 if (plen % 8) {
1263 addr[(plen + 7) / 8 - 1] &=
1264 ((0xff00 >> (plen % 8)) & 0xff);
1265 }
1266 snprintf(buf, buflen, "%s/%d",
1267 isonsap_string(ndo, addr,(plen + 7) / 8),
1268 plen);
1269
1270 return 1 + (plen + 7) / 8;
1271
1272 trunc:
1273 return -2;
1274 }
1275
1276 static int
1277 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1278 const u_char *pptr, char *buf, u_int buflen)
1279 {
1280 uint8_t addr[19];
1281 u_int plen;
1282
1283 ND_TCHECK_1(pptr);
1284 plen = EXTRACT_U_1(pptr); /* get prefix length */
1285
1286 if ((24+64) > plen)
1287 return -1;
1288
1289 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1290
1291 if (152 < plen)
1292 return -1;
1293
1294 memset(&addr, 0, sizeof(addr));
1295 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1296 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1297 if (plen % 8) {
1298 addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
1299 }
1300 /* the label may get offsetted by 4 bits so lets shift it right */
1301 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1302 bgp_vpn_rd_print(ndo, pptr+4),
1303 isonsap_string(ndo, addr,(plen + 7) / 8),
1304 plen,
1305 EXTRACT_BE_U_3(pptr + 1)>>4,
1306 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1307
1308 return 12 + (plen + 7) / 8;
1309
1310 trunc:
1311 return -2;
1312 }
1313
1314 /*
1315 * bgp_attr_get_as_size
1316 *
1317 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1318 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1319 * support, exchange AS-Path with the same path-attribute type value 0x02.
1320 */
1321 static u_int
1322 bgp_attr_get_as_size(netdissect_options *ndo,
1323 uint8_t bgpa_type, const u_char *pptr, u_int len)
1324 {
1325 const u_char *tptr = pptr;
1326
1327 /*
1328 * If the path attribute is the optional AS4 path type, then we already
1329 * know, that ASs must be encoded in 4 byte format.
1330 */
1331 if (bgpa_type == BGPTYPE_AS4_PATH) {
1332 return 4;
1333 }
1334
1335 /*
1336 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1337 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1338 * each.
1339 */
1340 while (tptr < pptr + len) {
1341 ND_TCHECK_1(tptr);
1342
1343 /*
1344 * If we do not find a valid segment type, our guess might be wrong.
1345 */
1346 if (EXTRACT_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || EXTRACT_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
1347 goto trunc;
1348 }
1349 ND_TCHECK_1(tptr + 1);
1350 tptr += 2 + EXTRACT_U_1(tptr + 1) * 2;
1351 }
1352
1353 /*
1354 * If we correctly reached end of the AS path attribute data content,
1355 * then most likely ASs were indeed encoded as 2 bytes.
1356 */
1357 if (tptr == pptr + len) {
1358 return 2;
1359 }
1360
1361 trunc:
1362
1363 /*
1364 * We can come here, either we did not have enough data, or if we
1365 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1366 * so that calller can try to decode each AS as of 4 bytes. If indeed
1367 * there was not enough data, it will crib and end the parse anyways.
1368 */
1369 return 4;
1370 }
1371
1372 /*
1373 * The only way to know that a BGP UPDATE message is using add path is
1374 * by checking if the capability is in the OPEN message which we may have missed.
1375 * So this function checks if it is possible that the update could contain add path
1376 * and if so it checks that standard BGP doesn't make sense.
1377 */
1378 static int
1379 check_add_path(const u_char *pptr, u_int length, u_int max_prefix_length)
1380 {
1381 u_int offset, prefix_length;
1382
1383 if (length < 5) {
1384 return 0;
1385 }
1386
1387 /* check if it could be add path */
1388 for (offset = 0; offset < length;) {
1389 offset += 4;
1390 prefix_length = EXTRACT_U_1(pptr + offset);
1391 /*
1392 * Add 4 to cover the path id
1393 * and check the prefix length isn't greater than 32/128.
1394 */
1395 if (prefix_length > max_prefix_length) {
1396 return 0;
1397 }
1398 /* Add 1 for the prefix_length byte and prefix_length to cover the address */
1399 offset += 1 + ((prefix_length + 7) / 8);
1400 }
1401 /* check we haven't gone past the end of the section */
1402 if (offset > length) {
1403 return 0;
1404 }
1405
1406 /* check it's not standard BGP */
1407 for (offset = 0; offset < length; ) {
1408 prefix_length = EXTRACT_U_1(pptr + offset);
1409 /*
1410 * If the prefix_length is zero (0.0.0.0/0)
1411 * and since it's not the only address (length >= 5)
1412 * then it is add-path
1413 */
1414 if (prefix_length < 1 || prefix_length > max_prefix_length) {
1415 return 1;
1416 }
1417 offset += 1 + ((prefix_length + 7) / 8);
1418 }
1419 if (offset > length) {
1420 return 1;
1421 }
1422
1423 /* assume not add-path by default */
1424 return 0;
1425 }
1426
1427 static int
1428 bgp_attr_print(netdissect_options *ndo,
1429 u_int atype, const u_char *pptr, u_int len)
1430 {
1431 u_int i;
1432 uint16_t af;
1433 uint8_t safi, snpa, nhlen;
1434 union { /* copy buffer for bandwidth values */
1435 float f;
1436 uint32_t i;
1437 } bw;
1438 int advance;
1439 u_int tlen;
1440 const u_char *tptr;
1441 char buf[MAXHOSTNAMELEN + 100];
1442 u_int as_size;
1443 int add_path4, add_path6;
1444 u_int path_id;
1445
1446 tptr = pptr;
1447 tlen = len;
1448
1449 switch (atype) {
1450 case BGPTYPE_ORIGIN:
1451 if (len != 1)
1452 ND_PRINT((ndo, "invalid len"));
1453 else {
1454 ND_TCHECK_1(tptr);
1455 ND_PRINT((ndo, "%s", tok2str(bgp_origin_values,
1456 "Unknown Origin Typecode",
1457 EXTRACT_U_1(tptr))));
1458 }
1459 break;
1460
1461 /*
1462 * Process AS4 byte path and AS2 byte path attributes here.
1463 */
1464 case BGPTYPE_AS4_PATH:
1465 case BGPTYPE_AS_PATH:
1466 if (len % 2) {
1467 ND_PRINT((ndo, "invalid len"));
1468 break;
1469 }
1470 if (!len) {
1471 ND_PRINT((ndo, "empty"));
1472 break;
1473 }
1474
1475 /*
1476 * BGP updates exchanged between New speakers that support 4
1477 * byte AS, ASs are always encoded in 4 bytes. There is no
1478 * definitive way to find this, just by the packet's
1479 * contents. So, check for packet's TLV's sanity assuming
1480 * 2 bytes first, and it does not pass, assume that ASs are
1481 * encoded in 4 bytes format and move on.
1482 */
1483 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1484
1485 while (tptr < pptr + len) {
1486 ND_TCHECK_1(tptr);
1487 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values,
1488 "?", EXTRACT_U_1(tptr))));
1489 ND_TCHECK_1(tptr + 1);
1490 for (i = 0; i < EXTRACT_U_1(tptr + 1) * as_size; i += as_size) {
1491 ND_TCHECK_LEN(tptr + 2 + i, as_size);
1492 ND_PRINT((ndo, "%s ",
1493 as_printf(ndo, astostr, sizeof(astostr),
1494 as_size == 2 ?
1495 EXTRACT_BE_U_2(tptr + i + 2) :
1496 EXTRACT_BE_U_4(tptr + i + 2))));
1497 }
1498 ND_TCHECK_1(tptr);
1499 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values,
1500 "?", EXTRACT_U_1(tptr))));
1501 ND_TCHECK_1(tptr + 1);
1502 tptr += 2 + EXTRACT_U_1(tptr + 1) * as_size;
1503 }
1504 break;
1505 case BGPTYPE_NEXT_HOP:
1506 if (len != 4)
1507 ND_PRINT((ndo, "invalid len"));
1508 else {
1509 ND_TCHECK_4(tptr);
1510 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1511 }
1512 break;
1513 case BGPTYPE_MULTI_EXIT_DISC:
1514 case BGPTYPE_LOCAL_PREF:
1515 if (len != 4)
1516 ND_PRINT((ndo, "invalid len"));
1517 else {
1518 ND_TCHECK_4(tptr);
1519 ND_PRINT((ndo, "%u", EXTRACT_BE_U_4(tptr)));
1520 }
1521 break;
1522 case BGPTYPE_ATOMIC_AGGREGATE:
1523 if (len != 0)
1524 ND_PRINT((ndo, "invalid len"));
1525 break;
1526 case BGPTYPE_AGGREGATOR:
1527
1528 /*
1529 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1530 * the length of this PA can be either 6 bytes or 8 bytes.
1531 */
1532 if (len != 6 && len != 8) {
1533 ND_PRINT((ndo, "invalid len"));
1534 break;
1535 }
1536 ND_TCHECK_LEN(tptr, len);
1537 if (len == 6) {
1538 ND_PRINT((ndo, " AS #%s, origin %s",
1539 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(tptr)),
1540 ipaddr_string(ndo, tptr + 2)));
1541 } else {
1542 ND_PRINT((ndo, " AS #%s, origin %s",
1543 as_printf(ndo, astostr, sizeof(astostr),
1544 EXTRACT_BE_U_4(tptr)), ipaddr_string(ndo, tptr + 4)));
1545 }
1546 break;
1547 case BGPTYPE_AGGREGATOR4:
1548 if (len != 8) {
1549 ND_PRINT((ndo, "invalid len"));
1550 break;
1551 }
1552 ND_TCHECK_8(tptr);
1553 ND_PRINT((ndo, " AS #%s, origin %s",
1554 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr)),
1555 ipaddr_string(ndo, tptr + 4)));
1556 break;
1557 case BGPTYPE_COMMUNITIES:
1558 if (len % 4) {
1559 ND_PRINT((ndo, "invalid len"));
1560 break;
1561 }
1562 while (tlen>0) {
1563 uint32_t comm;
1564 ND_TCHECK_4(tptr);
1565 comm = EXTRACT_BE_U_4(tptr);
1566 switch (comm) {
1567 case BGP_COMMUNITY_NO_EXPORT:
1568 ND_PRINT((ndo, " NO_EXPORT"));
1569 break;
1570 case BGP_COMMUNITY_NO_ADVERT:
1571 ND_PRINT((ndo, " NO_ADVERTISE"));
1572 break;
1573 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1574 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1575 break;
1576 default:
1577 ND_PRINT((ndo, "%u:%u%s",
1578 (comm >> 16) & 0xffff,
1579 comm & 0xffff,
1580 (tlen>4) ? ", " : ""));
1581 break;
1582 }
1583 tlen -=4;
1584 tptr +=4;
1585 }
1586 break;
1587 case BGPTYPE_ORIGINATOR_ID:
1588 if (len != 4) {
1589 ND_PRINT((ndo, "invalid len"));
1590 break;
1591 }
1592 ND_TCHECK_4(tptr);
1593 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1594 break;
1595 case BGPTYPE_CLUSTER_LIST:
1596 if (len % 4) {
1597 ND_PRINT((ndo, "invalid len"));
1598 break;
1599 }
1600 while (tlen>0) {
1601 ND_TCHECK_4(tptr);
1602 ND_PRINT((ndo, "%s%s",
1603 ipaddr_string(ndo, tptr),
1604 (tlen>4) ? ", " : ""));
1605 tlen -=4;
1606 tptr +=4;
1607 }
1608 break;
1609 case BGPTYPE_MP_REACH_NLRI:
1610 ND_TCHECK_3(tptr);
1611 af = EXTRACT_BE_U_2(tptr);
1612 safi = EXTRACT_U_1(tptr + 2);
1613
1614 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1615 tok2str(af_values, "Unknown AFI", af),
1616 af,
1617 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1618 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1619 safi));
1620
1621 switch(af<<8 | safi) {
1622 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1623 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1624 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1625 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1626 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1627 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1628 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1629 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1630 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1631 case (AFNUM_INET<<8 | SAFNUM_MDT):
1632 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1633 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1634 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1635 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1636 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1637 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1638 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1639 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1640 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1641 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1642 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1643 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1644 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1645 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1646 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1647 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1648 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1649 break;
1650 default:
1651 ND_TCHECK_LEN(tptr, tlen);
1652 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1653 if (ndo->ndo_vflag <= 1)
1654 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1655 goto done;
1656 break;
1657 }
1658
1659 tptr +=3;
1660
1661 ND_TCHECK_1(tptr);
1662 nhlen = EXTRACT_U_1(tptr);
1663 tlen = nhlen;
1664 tptr++;
1665
1666 if (tlen) {
1667 int nnh = 0;
1668 ND_PRINT((ndo, "\n\t nexthop: "));
1669 while (tlen > 0) {
1670 if (nnh++ > 0) {
1671 ND_PRINT((ndo, ", " ));
1672 }
1673 switch(af<<8 | safi) {
1674 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1675 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1676 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1677 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1678 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1679 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1680 case (AFNUM_INET<<8 | SAFNUM_MDT):
1681 if (tlen < sizeof(struct in_addr)) {
1682 ND_PRINT((ndo, "invalid len"));
1683 tlen = 0;
1684 } else {
1685 ND_TCHECK_LEN(tptr, sizeof(struct in_addr));
1686 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1687 tlen -= sizeof(struct in_addr);
1688 tptr += sizeof(struct in_addr);
1689 }
1690 break;
1691 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1692 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1693 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1694 if (tlen < sizeof(struct in_addr)+BGP_VPN_RD_LEN) {
1695 ND_PRINT((ndo, "invalid len"));
1696 tlen = 0;
1697 } else {
1698 ND_TCHECK_LEN(tptr,
1699 sizeof(struct in_addr) + BGP_VPN_RD_LEN);
1700 ND_PRINT((ndo, "RD: %s, %s",
1701 bgp_vpn_rd_print(ndo, tptr),
1702 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1703 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1704 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1705 }
1706 break;
1707 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1708 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1709 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1710 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1711 if (tlen < sizeof(struct in6_addr)) {
1712 ND_PRINT((ndo, "invalid len"));
1713 tlen = 0;
1714 } else {
1715 ND_TCHECK_LEN(tptr, sizeof(struct in6_addr));
1716 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr)));
1717 tlen -= sizeof(struct in6_addr);
1718 tptr += sizeof(struct in6_addr);
1719 }
1720 break;
1721 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1722 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1723 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1724 if (tlen < sizeof(struct in6_addr)+BGP_VPN_RD_LEN) {
1725 ND_PRINT((ndo, "invalid len"));
1726 tlen = 0;
1727 } else {
1728 ND_TCHECK_LEN(tptr,
1729 sizeof(struct in6_addr) + BGP_VPN_RD_LEN);
1730 ND_PRINT((ndo, "RD: %s, %s",
1731 bgp_vpn_rd_print(ndo, tptr),
1732 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1733 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1734 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1735 }
1736 break;
1737 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1738 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1739 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1740 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1741 if (tlen < sizeof(struct in_addr)) {
1742 ND_PRINT((ndo, "invalid len"));
1743 tlen = 0;
1744 } else {
1745 ND_TCHECK_LEN(tptr, sizeof(struct in_addr));
1746 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1747 tlen -= (sizeof(struct in_addr));
1748 tptr += (sizeof(struct in_addr));
1749 }
1750 break;
1751 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1752 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1753 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1754 ND_TCHECK_LEN(tptr, tlen);
1755 ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen)));
1756 tptr += tlen;
1757 tlen = 0;
1758 break;
1759
1760 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1761 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1762 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1763 if (tlen < BGP_VPN_RD_LEN+1) {
1764 ND_PRINT((ndo, "invalid len"));
1765 tlen = 0;
1766 } else {
1767 ND_TCHECK_LEN(tptr, tlen);
1768 ND_PRINT((ndo, "RD: %s, %s",
1769 bgp_vpn_rd_print(ndo, tptr),
1770 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1771 /* rfc986 mapped IPv4 address ? */
1772 if (EXTRACT_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
1773 ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4)));
1774 /* rfc1888 mapped IPv6 address ? */
1775 else if (EXTRACT_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
1776 ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3)));
1777 tptr += tlen;
1778 tlen = 0;
1779 }
1780 break;
1781 default:
1782 ND_TCHECK_LEN(tptr, tlen);
1783 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1784 if (ndo->ndo_vflag <= 1)
1785 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1786 tptr += tlen;
1787 tlen = 0;
1788 goto done;
1789 break;
1790 }
1791 }
1792 }
1793 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1794 tptr += tlen;
1795
1796 ND_TCHECK_1(tptr);
1797 snpa = EXTRACT_U_1(tptr);
1798 tptr++;
1799
1800 if (snpa) {
1801 ND_PRINT((ndo, "\n\t %u SNPA", snpa));
1802 for (/*nothing*/; snpa > 0; snpa--) {
1803 ND_TCHECK_1(tptr);
1804 ND_PRINT((ndo, "\n\t %d bytes", EXTRACT_U_1(tptr)));
1805 tptr += EXTRACT_U_1(tptr) + 1;
1806 }
1807 } else {
1808 ND_PRINT((ndo, ", no SNPA"));
1809 }
1810
1811 add_path4 = check_add_path(tptr, (len-(tptr - pptr)), 32);
1812 add_path6 = check_add_path(tptr, (len-(tptr - pptr)), 128);
1813
1814 while (tptr < pptr + len) {
1815 switch (af<<8 | safi) {
1816 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1817 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1818 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1819 if (add_path4) {
1820 path_id = EXTRACT_BE_U_4(tptr);
1821 tptr += 4;
1822 }
1823 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1824 if (advance == -1)
1825 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1826 else if (advance == -2)
1827 goto trunc;
1828 else if (advance == -3)
1829 break; /* bytes left, but not enough */
1830 else
1831 ND_PRINT((ndo, "\n\t %s", buf));
1832 if (add_path4) {
1833 ND_PRINT((ndo, " Path Id: %d", path_id));
1834 }
1835 break;
1836 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1837 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1838 if (advance == -1)
1839 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1840 else if (advance == -2)
1841 goto trunc;
1842 else if (advance == -3)
1843 break; /* bytes left, but not enough */
1844 else
1845 ND_PRINT((ndo, "\n\t %s", buf));
1846 break;
1847 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1848 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1849 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1850 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1851 if (advance == -1)
1852 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1853 else if (advance == -2)
1854 goto trunc;
1855 else
1856 ND_PRINT((ndo, "\n\t %s", buf));
1857 break;
1858 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1859 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf));
1860 if (advance == -1)
1861 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1862 else if (advance == -2)
1863 goto trunc;
1864 else
1865 ND_PRINT((ndo, "\n\t %s", buf));
1866 break;
1867 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1868 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1869 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1870 if (advance == -1)
1871 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1872 else if (advance == -2)
1873 goto trunc;
1874 else
1875 ND_PRINT((ndo, "\n\t %s", buf));
1876 break;
1877
1878 case (AFNUM_INET<<8 | SAFNUM_MDT):
1879 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1880 if (advance == -1)
1881 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1882 else if (advance == -2)
1883 goto trunc;
1884 else
1885 ND_PRINT((ndo, "\n\t %s", buf));
1886 break;
1887 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1888 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1889 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1890 if (add_path6) {
1891 path_id = EXTRACT_BE_U_4(tptr);
1892 tptr += 4;
1893 }
1894 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1895 if (advance == -1)
1896 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1897 else if (advance == -2)
1898 goto trunc;
1899 else if (advance == -3)
1900 break; /* bytes left, but not enough */
1901 else
1902 ND_PRINT((ndo, "\n\t %s", buf));
1903 if (add_path6) {
1904 ND_PRINT((ndo, " Path Id: %d", path_id));
1905 }
1906 break;
1907 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1908 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1909 if (advance == -1)
1910 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1911 else if (advance == -2)
1912 goto trunc;
1913 else if (advance == -3)
1914 break; /* bytes left, but not enough */
1915 else
1916 ND_PRINT((ndo, "\n\t %s", buf));
1917 break;
1918 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1919 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1920 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1921 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1922 if (advance == -1)
1923 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1924 else if (advance == -2)
1925 goto trunc;
1926 else
1927 ND_PRINT((ndo, "\n\t %s", buf));
1928 break;
1929 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1930 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1931 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1932 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1933 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1934 if (advance == -1)
1935 ND_PRINT((ndo, "\n\t (illegal length)"));
1936 else if (advance == -2)
1937 goto trunc;
1938 else
1939 ND_PRINT((ndo, "\n\t %s", buf));
1940 break;
1941 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1942 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1943 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1944 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1945 if (advance == -1)
1946 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1947 else if (advance == -2)
1948 goto trunc;
1949 else
1950 ND_PRINT((ndo, "\n\t %s", buf));
1951 break;
1952 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1953 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1954 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1955 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1956 if (advance == -1)
1957 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1958 else if (advance == -2)
1959 goto trunc;
1960 else
1961 ND_PRINT((ndo, "\n\t %s", buf));
1962 break;
1963 default:
1964 ND_TCHECK_LEN(tptr, tlen);
1965 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1966 if (ndo->ndo_vflag <= 1)
1967 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1968 advance = 0;
1969 tptr = pptr + len;
1970 break;
1971 }
1972 if (advance < 0)
1973 break;
1974 tptr += advance;
1975 }
1976 done:
1977 break;
1978
1979 case BGPTYPE_MP_UNREACH_NLRI:
1980 ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
1981 af = EXTRACT_BE_U_2(tptr);
1982 safi = EXTRACT_U_1(tptr + 2);
1983
1984 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1985 tok2str(af_values, "Unknown AFI", af),
1986 af,
1987 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1988 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1989 safi));
1990
1991 if (len == BGP_MP_NLRI_MINSIZE)
1992 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
1993
1994 tptr += 3;
1995
1996 add_path4 = check_add_path(tptr, (len-(tptr - pptr)), 32);
1997 add_path6 = check_add_path(tptr, (len-(tptr - pptr)), 128);
1998
1999 while (tptr < pptr + len) {
2000 switch (af<<8 | safi) {
2001 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
2002 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
2003 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
2004 if (add_path4) {
2005 path_id = EXTRACT_BE_U_4(tptr);
2006 tptr += 4;
2007 }
2008 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
2009 if (advance == -1)
2010 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2011 else if (advance == -2)
2012 goto trunc;
2013 else if (advance == -3)
2014 break; /* bytes left, but not enough */
2015 else
2016 ND_PRINT((ndo, "\n\t %s", buf));
2017 if (add_path4) {
2018 ND_PRINT((ndo, " Path Id: %d", path_id));
2019 }
2020 break;
2021 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
2022 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
2023 if (advance == -1)
2024 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2025 else if (advance == -2)
2026 goto trunc;
2027 else if (advance == -3)
2028 break; /* bytes left, but not enough */
2029 else
2030 ND_PRINT((ndo, "\n\t %s", buf));
2031 break;
2032 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
2033 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
2034 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
2035 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
2036 if (advance == -1)
2037 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2038 else if (advance == -2)
2039 goto trunc;
2040 else
2041 ND_PRINT((ndo, "\n\t %s", buf));
2042 break;
2043 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
2044 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
2045 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
2046 if (add_path6) {
2047 path_id = EXTRACT_BE_U_4(tptr);
2048 tptr += 4;
2049 }
2050 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
2051 if (advance == -1)
2052 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2053 else if (advance == -2)
2054 goto trunc;
2055 else if (advance == -3)
2056 break; /* bytes left, but not enough */
2057 else
2058 ND_PRINT((ndo, "\n\t %s", buf));
2059 if (add_path6) {
2060 ND_PRINT((ndo, " Path Id: %d", path_id));
2061 }
2062 break;
2063 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
2064 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
2065 if (advance == -1)
2066 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2067 else if (advance == -2)
2068 goto trunc;
2069 else if (advance == -3)
2070 break; /* bytes left, but not enough */
2071 else
2072 ND_PRINT((ndo, "\n\t %s", buf));
2073 break;
2074 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
2075 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
2076 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
2077 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
2078 if (advance == -1)
2079 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2080 else if (advance == -2)
2081 goto trunc;
2082 else
2083 ND_PRINT((ndo, "\n\t %s", buf));
2084 break;
2085 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
2086 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2087 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2088 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2089 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
2090 if (advance == -1)
2091 ND_PRINT((ndo, "\n\t (illegal length)"));
2092 else if (advance == -2)
2093 goto trunc;
2094 else
2095 ND_PRINT((ndo, "\n\t %s", buf));
2096 break;
2097 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2098 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2099 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2100 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2101 if (advance == -1)
2102 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2103 else if (advance == -2)
2104 goto trunc;
2105 else
2106 ND_PRINT((ndo, "\n\t %s", buf));
2107 break;
2108 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2109 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2110 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2111 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2112 if (advance == -1)
2113 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2114 else if (advance == -2)
2115 goto trunc;
2116 else
2117 ND_PRINT((ndo, "\n\t %s", buf));
2118 break;
2119 case (AFNUM_INET<<8 | SAFNUM_MDT):
2120 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
2121 if (advance == -1)
2122 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2123 else if (advance == -2)
2124 goto trunc;
2125 else
2126 ND_PRINT((ndo, "\n\t %s", buf));
2127 break;
2128 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
2129 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
2130 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
2131 if (advance == -1)
2132 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2133 else if (advance == -2)
2134 goto trunc;
2135 else
2136 ND_PRINT((ndo, "\n\t %s", buf));
2137 break;
2138 default:
2139 ND_TCHECK_LEN(tptr - 3, tlen);
2140 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
2141 if (ndo->ndo_vflag <= 1)
2142 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
2143 advance = 0;
2144 tptr = pptr + len;
2145 break;
2146 }
2147 if (advance < 0)
2148 break;
2149 tptr += advance;
2150 }
2151 break;
2152 case BGPTYPE_EXTD_COMMUNITIES:
2153 if (len % 8) {
2154 ND_PRINT((ndo, "invalid len"));
2155 break;
2156 }
2157 while (tlen>0) {
2158 uint16_t extd_comm;
2159
2160 ND_TCHECK_2(tptr);
2161 extd_comm=EXTRACT_BE_U_2(tptr);
2162
2163 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]",
2164 tok2str(bgp_extd_comm_subtype_values,
2165 "unknown extd community typecode",
2166 extd_comm),
2167 extd_comm,
2168 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2169
2170 ND_TCHECK_6(tptr + 2);
2171 switch(extd_comm) {
2172 case BGP_EXT_COM_RT_0:
2173 case BGP_EXT_COM_RO_0:
2174 case BGP_EXT_COM_L2VPN_RT_0:
2175 ND_PRINT((ndo, ": %u:%u (= %s)",
2176 EXTRACT_BE_U_2(tptr + 2),
2177 EXTRACT_BE_U_4(tptr + 4),
2178 ipaddr_string(ndo, tptr+4)));
2179 break;
2180 case BGP_EXT_COM_RT_1:
2181 case BGP_EXT_COM_RO_1:
2182 case BGP_EXT_COM_L2VPN_RT_1:
2183 case BGP_EXT_COM_VRF_RT_IMP:
2184 ND_PRINT((ndo, ": %s:%u",
2185 ipaddr_string(ndo, tptr+2),
2186 EXTRACT_BE_U_2(tptr + 6)));
2187 break;
2188 case BGP_EXT_COM_RT_2:
2189 case BGP_EXT_COM_RO_2:
2190 ND_PRINT((ndo, ": %s:%u",
2191 as_printf(ndo, astostr, sizeof(astostr),
2192 EXTRACT_BE_U_4(tptr + 2)), EXTRACT_BE_U_2(tptr + 6)));
2193 break;
2194 case BGP_EXT_COM_LINKBAND:
2195 bw.i = EXTRACT_BE_U_4(tptr + 2);
2196 ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2197 bw.f*8/1000000));
2198 break;
2199 case BGP_EXT_COM_VPN_ORIGIN:
2200 case BGP_EXT_COM_VPN_ORIGIN2:
2201 case BGP_EXT_COM_VPN_ORIGIN3:
2202 case BGP_EXT_COM_VPN_ORIGIN4:
2203 case BGP_EXT_COM_OSPF_RID:
2204 case BGP_EXT_COM_OSPF_RID2:
2205 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2)));
2206 break;
2207 case BGP_EXT_COM_OSPF_RTYPE:
2208 case BGP_EXT_COM_OSPF_RTYPE2:
2209 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2210 ipaddr_string(ndo, tptr+2),
2211 tok2str(bgp_extd_comm_ospf_rtype_values,
2212 "unknown (0x%02x)",
2213 EXTRACT_U_1((tptr + 6))),
2214 (EXTRACT_U_1(tptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2215 ((EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_EXT) || (EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2216 break;
2217 case BGP_EXT_COM_L2INFO:
2218 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2219 tok2str(l2vpn_encaps_values,
2220 "unknown encaps",
2221 EXTRACT_U_1((tptr + 2))),
2222 EXTRACT_U_1((tptr + 3)),
2223 EXTRACT_BE_U_2(tptr + 4)));
2224 break;
2225 case BGP_EXT_COM_SOURCE_AS:
2226 ND_PRINT((ndo, ": AS %u", EXTRACT_BE_U_2(tptr + 2)));
2227 break;
2228 default:
2229 ND_TCHECK_8(tptr);
2230 print_unknown_data(ndo, tptr, "\n\t ", 8);
2231 break;
2232 }
2233 tlen -= 8;
2234 tptr += 8;
2235 }
2236 break;
2237
2238 case BGPTYPE_PMSI_TUNNEL:
2239 {
2240 uint8_t tunnel_type, flags;
2241
2242 ND_TCHECK_5(tptr);
2243 flags = EXTRACT_U_1(tptr);
2244 tunnel_type = EXTRACT_U_1(tptr + 1);
2245 tlen = len;
2246
2247 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2248 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2249 tunnel_type,
2250 bittok2str(bgp_pmsi_flag_values, "none", flags),
2251 EXTRACT_BE_U_3(tptr + 2)>>4));
2252
2253 tptr +=5;
2254 tlen -= 5;
2255
2256 switch (tunnel_type) {
2257 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2258 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2259 ND_TCHECK_8(tptr);
2260 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s",
2261 ipaddr_string(ndo, tptr),
2262 ipaddr_string(ndo, tptr+4)));
2263 break;
2264
2265 case BGP_PMSI_TUNNEL_PIM_SSM:
2266 ND_TCHECK_8(tptr);
2267 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s",
2268 ipaddr_string(ndo, tptr),
2269 ipaddr_string(ndo, tptr+4)));
2270 break;
2271 case BGP_PMSI_TUNNEL_INGRESS:
2272 ND_TCHECK_4(tptr);
2273 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s",
2274 ipaddr_string(ndo, tptr)));
2275 break;
2276 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2277 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2278 ND_TCHECK_8(tptr);
2279 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x",
2280 ipaddr_string(ndo, tptr),
2281 EXTRACT_BE_U_4(tptr + 4)));
2282 break;
2283 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2284 ND_TCHECK_8(tptr);
2285 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2286 ipaddr_string(ndo, tptr),
2287 EXTRACT_BE_U_4(tptr + 4)));
2288 break;
2289 default:
2290 if (ndo->ndo_vflag <= 1) {
2291 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2292 }
2293 }
2294 break;
2295 }
2296 case BGPTYPE_AIGP:
2297 {
2298 uint8_t type;
2299 uint16_t length;
2300
2301 tlen = len;
2302
2303 while (tlen >= 3) {
2304
2305 ND_TCHECK_3(tptr);
2306
2307 type = EXTRACT_U_1(tptr);
2308 length = EXTRACT_BE_U_2(tptr + 1);
2309 tptr += 3;
2310 tlen -= 3;
2311
2312 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u",
2313 tok2str(bgp_aigp_values, "Unknown", type),
2314 type, length));
2315
2316 if (length < 3)
2317 goto trunc;
2318 length -= 3;
2319
2320 /*
2321 * Check if we can read the TLV data.
2322 */
2323 ND_TCHECK_LEN(tptr + 3, length);
2324
2325 switch (type) {
2326
2327 case BGP_AIGP_TLV:
2328 if (length < 8)
2329 goto trunc;
2330 ND_PRINT((ndo, ", metric %" PRIu64,
2331 EXTRACT_BE_U_8(tptr)));
2332 break;
2333
2334 default:
2335 if (ndo->ndo_vflag <= 1) {
2336 print_unknown_data(ndo, tptr,"\n\t ", length);
2337 }
2338 }
2339
2340 tptr += length;
2341 tlen -= length;
2342 }
2343 break;
2344 }
2345 case BGPTYPE_ATTR_SET:
2346 ND_TCHECK_4(tptr);
2347 if (len < 4)
2348 goto trunc;
2349 ND_PRINT((ndo, "\n\t Origin AS: %s",
2350 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr))));
2351 tptr += 4;
2352 len -= 4;
2353
2354 while (len) {
2355 u_int aflags, alenlen, alen;
2356
2357 ND_TCHECK_2(tptr);
2358 if (len < 2)
2359 goto trunc;
2360 aflags = EXTRACT_U_1(tptr);
2361 atype = EXTRACT_U_1(tptr + 1);
2362 tptr += 2;
2363 len -= 2;
2364 alenlen = bgp_attr_lenlen(aflags, tptr);
2365 ND_TCHECK_LEN(tptr, alenlen);
2366 if (len < alenlen)
2367 goto trunc;
2368 alen = bgp_attr_len(aflags, tptr);
2369 tptr += alenlen;
2370 len -= alenlen;
2371
2372 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2373 tok2str(bgp_attr_values,
2374 "Unknown Attribute", atype),
2375 atype,
2376 alen));
2377
2378 if (aflags) {
2379 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2380 aflags & 0x80 ? "O" : "",
2381 aflags & 0x40 ? "T" : "",
2382 aflags & 0x20 ? "P" : "",
2383 aflags & 0x10 ? "E" : ""));
2384 if (aflags & 0xf)
2385 ND_PRINT((ndo, "+%x", aflags & 0xf));
2386 ND_PRINT((ndo, "]: "));
2387 }
2388 /* FIXME check for recursion */
2389 if (!bgp_attr_print(ndo, atype, tptr, alen))
2390 return 0;
2391 tptr += alen;
2392 len -= alen;
2393 }
2394 break;
2395
2396 case BGPTYPE_LARGE_COMMUNITY:
2397 if (len == 0 || len % 12) {
2398 ND_PRINT((ndo, "invalid len"));
2399 break;
2400 }
2401 ND_PRINT((ndo, "\n\t "));
2402 while (len > 0) {
2403 ND_TCHECK_LEN(tptr, 12);
2404 ND_PRINT((ndo, "%u:%u:%u%s",
2405 EXTRACT_BE_U_4(tptr),
2406 EXTRACT_BE_U_4(tptr + 4),
2407 EXTRACT_BE_U_4(tptr + 8),
2408 (len > 12) ? ", " : ""));
2409 tptr += 12;
2410 len -= 12;
2411 }
2412 break;
2413 default:
2414 ND_TCHECK_LEN(pptr, len);
2415 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2416 if (ndo->ndo_vflag <= 1)
2417 print_unknown_data(ndo, pptr, "\n\t ", len);
2418 break;
2419 }
2420 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2421 ND_TCHECK_LEN(pptr, len);
2422 print_unknown_data(ndo, pptr, "\n\t ", len);
2423 }
2424 return 1;
2425
2426 trunc:
2427 return 0;
2428 }
2429
2430 static void
2431 bgp_capabilities_print(netdissect_options *ndo,
2432 const u_char *opt, u_int caps_len)
2433 {
2434 u_int cap_type, cap_len, tcap_len, cap_offset;
2435 u_int i = 0;
2436
2437 while (i < caps_len) {
2438 ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
2439 cap_type=EXTRACT_U_1(opt + i);
2440 cap_len=EXTRACT_U_1(opt + i + 1);
2441 tcap_len=cap_len;
2442 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2443 tok2str(bgp_capcode_values, "Unknown", cap_type),
2444 cap_type,
2445 cap_len));
2446 ND_TCHECK_LEN(opt + 2 + i, cap_len);
2447 switch (cap_type) {
2448 case BGP_CAPCODE_MP:
2449 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2450 tok2str(af_values, "Unknown", EXTRACT_BE_U_2(opt + i + 2)),
2451 EXTRACT_BE_U_2(opt + i + 2),
2452 tok2str(bgp_safi_values, "Unknown", EXTRACT_U_1(opt + i + 5)),
2453 EXTRACT_U_1(opt + i + 5)));
2454 break;
2455 case BGP_CAPCODE_RESTART:
2456 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2457 ((EXTRACT_U_1(opt + i + 2))&0x80) ? "R" : "none",
2458 EXTRACT_BE_U_2(opt + i + 2)&0xfff));
2459 tcap_len-=2;
2460 cap_offset=4;
2461 while(tcap_len>=4) {
2462 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2463 tok2str(af_values,"Unknown",
2464 EXTRACT_BE_U_2(opt + i + cap_offset)),
2465 EXTRACT_BE_U_2(opt + i + cap_offset),
2466 tok2str(bgp_safi_values,"Unknown",
2467 EXTRACT_U_1(opt + i + cap_offset + 2)),
2468 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2469 ((EXTRACT_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" ));
2470 tcap_len -= 4;
2471 cap_offset += 4;
2472 }
2473 break;
2474 case BGP_CAPCODE_RR:
2475 case BGP_CAPCODE_RR_CISCO:
2476 break;
2477 case BGP_CAPCODE_AS_NEW:
2478
2479 /*
2480 * Extract the 4 byte AS number encoded.
2481 */
2482 if (cap_len == 4) {
2483 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2484 as_printf(ndo, astostr, sizeof(astostr),
2485 EXTRACT_BE_U_4(opt + i + 2))));
2486 }
2487 break;
2488 case BGP_CAPCODE_ADD_PATH:
2489 cap_offset=2;
2490 if (tcap_len == 0) {
2491 ND_PRINT((ndo, " (bogus)")); /* length */
2492 break;
2493 }
2494 while (tcap_len > 0) {
2495 if (tcap_len < 4) {
2496 ND_PRINT((ndo, "\n\t\t(invalid)"));
2497 break;
2498 }
2499 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2500 tok2str(af_values,"Unknown",EXTRACT_BE_U_2(opt + i + cap_offset)),
2501 EXTRACT_BE_U_2(opt + i + cap_offset),
2502 tok2str(bgp_safi_values,"Unknown",EXTRACT_U_1(opt + i + cap_offset + 2)),
2503 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2504 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",EXTRACT_U_1(opt + i + cap_offset + 3))
2505 ));
2506 tcap_len -= 4;
2507 cap_offset += 4;
2508 }
2509 break;
2510 default:
2511 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2512 cap_type));
2513 if (ndo->ndo_vflag <= 1)
2514 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2515 cap_len);
2516 break;
2517 }
2518 if (ndo->ndo_vflag > 1 && cap_len > 0) {
2519 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2520 }
2521 i += BGP_CAP_HEADER_SIZE + cap_len;
2522 }
2523 return;
2524
2525 trunc:
2526 ND_PRINT((ndo, "[|BGP]"));
2527 }
2528
2529 static void
2530 bgp_open_print(netdissect_options *ndo,
2531 const u_char *dat, u_int length)
2532 {
2533 const struct bgp_open *bgp_open_header;
2534 u_int optslen;
2535 const struct bgp_opt *bgpopt;
2536 const u_char *opt;
2537 u_int i;
2538
2539 ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
2540 if (length < BGP_OPEN_SIZE)
2541 goto trunc;
2542
2543 bgp_open_header = (const struct bgp_open *)dat;
2544
2545 ND_PRINT((ndo, "\n\t Version %u, ",
2546 EXTRACT_U_1(bgp_open_header->bgpo_version)));
2547 ND_PRINT((ndo, "my AS %s, ",
2548 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(bgp_open_header->bgpo_myas))));
2549 ND_PRINT((ndo, "Holdtime %us, ",
2550 EXTRACT_BE_U_2(bgp_open_header->bgpo_holdtime)));
2551 ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgp_open_header->bgpo_id)));
2552 optslen = EXTRACT_U_1(bgp_open_header->bgpo_optlen);
2553 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", optslen));
2554
2555 opt = dat + BGP_OPEN_SIZE;
2556 length -= BGP_OPEN_SIZE;
2557
2558 i = 0;
2559 while (i < optslen) {
2560 uint8_t opt_type, opt_len;
2561
2562 ND_TCHECK_LEN(opt + i, BGP_OPT_SIZE);
2563 if (length < BGP_OPT_SIZE + i)
2564 goto trunc;
2565 bgpopt = (const struct bgp_opt *)(opt + i);
2566 opt_type = EXTRACT_U_1(bgpopt->bgpopt_type);
2567 opt_len = EXTRACT_U_1(bgpopt->bgpopt_len);
2568 if (BGP_OPT_SIZE + i + opt_len > optslen) {
2569 ND_PRINT((ndo, "\n\t Option %u, length: %u, goes past the end of the options",
2570 opt_type, opt_len));
2571 break;
2572 }
2573
2574 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u",
2575 tok2str(bgp_opt_values,"Unknown",opt_type),
2576 opt_type,
2577 opt_len));
2578
2579 /* now let's decode the options we know*/
2580 switch(opt_type) {
2581
2582 case BGP_OPT_CAP:
2583 bgp_capabilities_print(ndo, opt + BGP_OPT_SIZE + i,
2584 opt_len);
2585 break;
2586
2587 case BGP_OPT_AUTH:
2588 default:
2589 ND_PRINT((ndo, "\n\t no decoder for option %u",
2590 opt_type));
2591 break;
2592 }
2593 i += BGP_OPT_SIZE + opt_len;
2594 }
2595 return;
2596 trunc:
2597 ND_PRINT((ndo, "[|BGP]"));
2598 }
2599
2600 static void
2601 bgp_update_print(netdissect_options *ndo,
2602 const u_char *dat, u_int length)
2603 {
2604 const u_char *p;
2605 u_int withdrawn_routes_len;
2606 char buf[MAXHOSTNAMELEN + 100];
2607 int wpfx;
2608 u_int len;
2609 int i;
2610 int add_path;
2611 int path_id;
2612
2613 ND_TCHECK_LEN(dat, BGP_SIZE);
2614 if (length < BGP_SIZE)
2615 goto trunc;
2616 p = dat + BGP_SIZE;
2617 length -= BGP_SIZE;
2618
2619 /* Unfeasible routes */
2620 ND_TCHECK_2(p);
2621 if (length < 2)
2622 goto trunc;
2623 withdrawn_routes_len = EXTRACT_BE_U_2(p);
2624 p += 2;
2625 length -= 2;
2626 if (withdrawn_routes_len > 1) {
2627 /*
2628 * Without keeping state from the original NLRI message,
2629 * it's not possible to tell if this a v4 or v6 route,
2630 * so only try to decode it if we're not v6 enabled.
2631 */
2632 ND_TCHECK_LEN(p, withdrawn_routes_len);
2633 if (length < withdrawn_routes_len)
2634 goto trunc;
2635 ND_PRINT((ndo, "\n\t Withdrawn routes:"));
2636 add_path = check_add_path(p, withdrawn_routes_len, 32);
2637 while (withdrawn_routes_len > 0) {
2638 if (add_path) {
2639 path_id = EXTRACT_BE_U_4(p);
2640 p += 4;
2641 length -= 4;
2642 withdrawn_routes_len -= 4;
2643 }
2644 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
2645 if (wpfx == -1) {
2646 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2647 break;
2648 } else if (wpfx == -2)
2649 goto trunc;
2650 else if (wpfx == -3)
2651 goto trunc; /* bytes left, but not enough */
2652 else {
2653 ND_PRINT((ndo, "\n\t %s", buf));
2654 if (add_path) {
2655 ND_PRINT((ndo, " Path Id: %d", path_id));
2656 }
2657 p += wpfx;
2658 length -= wpfx;
2659 withdrawn_routes_len -= wpfx;
2660 }
2661 }
2662 } else {
2663 p += withdrawn_routes_len;
2664 length -= withdrawn_routes_len;
2665 }
2666
2667 ND_TCHECK_2(p);
2668 if (length < 2)
2669 goto trunc;
2670 len = EXTRACT_BE_U_2(p);
2671 p += 2;
2672 length -= 2;
2673
2674 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2675 /* No withdrawn routes, no path attributes, no NLRI */
2676 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2677 return;
2678 }
2679
2680 if (len) {
2681 /* do something more useful!*/
2682 while (len) {
2683 u_int aflags, atype, alenlen, alen;
2684
2685 ND_TCHECK_2(p);
2686 if (len < 2)
2687 goto trunc;
2688 if (length < 2)
2689 goto trunc;
2690 aflags = EXTRACT_U_1(p);
2691 atype = EXTRACT_U_1(p + 1);
2692 p += 2;
2693 len -= 2;
2694 length -= 2;
2695 alenlen = bgp_attr_lenlen(aflags, p);
2696 ND_TCHECK_LEN(p, alenlen);
2697 if (len < alenlen)
2698 goto trunc;
2699 if (length < alenlen)
2700 goto trunc;
2701 alen = bgp_attr_len(aflags, p);
2702 p += alenlen;
2703 len -= alenlen;
2704 length -= alenlen;
2705
2706 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2707 tok2str(bgp_attr_values, "Unknown Attribute", atype),
2708 atype,
2709 alen));
2710
2711 if (aflags) {
2712 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2713 aflags & 0x80 ? "O" : "",
2714 aflags & 0x40 ? "T" : "",
2715 aflags & 0x20 ? "P" : "",
2716 aflags & 0x10 ? "E" : ""));
2717 if (aflags & 0xf)
2718 ND_PRINT((ndo, "+%x", aflags & 0xf));
2719 ND_PRINT((ndo, "]: "));
2720 }
2721 if (len < alen)
2722 goto trunc;
2723 if (length < alen)
2724 goto trunc;
2725 if (!bgp_attr_print(ndo, atype, p, alen))
2726 goto trunc;
2727 p += alen;
2728 len -= alen;
2729 length -= alen;
2730 }
2731 }
2732
2733 if (length) {
2734 add_path = check_add_path(p, length, 32);
2735 ND_PRINT((ndo, "\n\t Updated routes:"));
2736 while (length > 0) {
2737 if (add_path) {
2738 path_id = EXTRACT_BE_U_4(p);
2739 p += 4;
2740 length -= 4;
2741 }
2742 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2743 if (i == -1) {
2744 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2745 break;
2746 } else if (i == -2)
2747 goto trunc;
2748 else if (i == -3)
2749 goto trunc; /* bytes left, but not enough */
2750 else {
2751 ND_PRINT((ndo, "\n\t %s", buf));
2752 if (add_path) {
2753 ND_PRINT((ndo, " Path Id: %d", path_id));
2754 }
2755 p += i;
2756 length -= i;
2757 }
2758 }
2759 }
2760 return;
2761 trunc:
2762 ND_PRINT((ndo, "[|BGP]"));
2763 }
2764
2765 static void
2766 bgp_notification_print(netdissect_options *ndo,
2767 const u_char *dat, u_int length)
2768 {
2769 const struct bgp_notification *bgp_notification_header;
2770 const u_char *tptr;
2771 uint8_t bgpn_major, bgpn_minor;
2772 uint8_t shutdown_comm_length;
2773 uint8_t remainder_offset;
2774
2775 ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
2776 if (length<BGP_NOTIFICATION_SIZE)
2777 return;
2778
2779 bgp_notification_header = (const struct bgp_notification *)dat;
2780 bgpn_major = EXTRACT_U_1(bgp_notification_header->bgpn_major);
2781 bgpn_minor = EXTRACT_U_1(bgp_notification_header->bgpn_minor);
2782
2783 ND_PRINT((ndo, ", %s (%u)",
2784 tok2str(bgp_notify_major_values, "Unknown Error",
2785 bgpn_major),
2786 bgpn_major));
2787
2788 switch (bgpn_major) {
2789
2790 case BGP_NOTIFY_MAJOR_MSG:
2791 ND_PRINT((ndo, ", subcode %s (%u)",
2792 tok2str(bgp_notify_minor_msg_values, "Unknown",
2793 bgpn_minor),
2794 bgpn_minor));
2795 break;
2796 case BGP_NOTIFY_MAJOR_OPEN:
2797 ND_PRINT((ndo, ", subcode %s (%u)",
2798 tok2str(bgp_notify_minor_open_values, "Unknown",
2799 bgpn_minor),
2800 bgpn_minor));
2801 break;
2802 case BGP_NOTIFY_MAJOR_UPDATE:
2803 ND_PRINT((ndo, ", subcode %s (%u)",
2804 tok2str(bgp_notify_minor_update_values, "Unknown",
2805 bgpn_minor),
2806 bgpn_minor));
2807 break;
2808 case BGP_NOTIFY_MAJOR_FSM:
2809 ND_PRINT((ndo, " subcode %s (%u)",
2810 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2811 bgpn_minor),
2812 bgpn_minor));
2813 break;
2814 case BGP_NOTIFY_MAJOR_CAP:
2815 ND_PRINT((ndo, " subcode %s (%u)",
2816 tok2str(bgp_notify_minor_cap_values, "Unknown",
2817 bgpn_minor),
2818 bgpn_minor));
2819 break;
2820 case BGP_NOTIFY_MAJOR_CEASE:
2821 ND_PRINT((ndo, ", subcode %s (%u)",
2822 tok2str(bgp_notify_minor_cease_values, "Unknown",
2823 bgpn_minor),
2824 bgpn_minor));
2825
2826 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2827 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2828 */
2829 if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2830 tptr = dat + BGP_NOTIFICATION_SIZE;
2831 ND_TCHECK_7(tptr);
2832 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2833 tok2str(af_values, "Unknown", EXTRACT_BE_U_2(tptr)),
2834 EXTRACT_BE_U_2(tptr),
2835 tok2str(bgp_safi_values, "Unknown", EXTRACT_U_1((tptr + 2))),
2836 EXTRACT_U_1((tptr + 2)),
2837 EXTRACT_BE_U_4(tptr + 3)));
2838 }
2839 /*
2840 * draft-ietf-idr-shutdown describes a method to send a communication
2841 * intended for human consumption regarding the Administrative Shutdown
2842 */
2843 if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
2844 bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
2845 length >= BGP_NOTIFICATION_SIZE + 1) {
2846 tptr = dat + BGP_NOTIFICATION_SIZE;
2847 ND_TCHECK_1(tptr);
2848 shutdown_comm_length = EXTRACT_U_1(tptr);
2849 remainder_offset = 0;
2850 /* garbage, hexdump it all */
2851 if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN ||
2852 shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) {
2853 ND_PRINT((ndo, ", invalid Shutdown Communication length"));
2854 }
2855 else if (shutdown_comm_length == 0) {
2856 ND_PRINT((ndo, ", empty Shutdown Communication"));
2857 remainder_offset += 1;
2858 }
2859 /* a proper shutdown communication */
2860 else {
2861 ND_TCHECK_LEN(tptr + 1, shutdown_comm_length);
2862 ND_PRINT((ndo, ", Shutdown Communication (length: %u): \"", shutdown_comm_length));
2863 (void)fn_printn(ndo, tptr+1, shutdown_comm_length, NULL);
2864 ND_PRINT((ndo, "\""));
2865 remainder_offset += shutdown_comm_length + 1;
2866 }
2867 /* if there is trailing data, hexdump it */
2868 if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) {
2869 ND_PRINT((ndo, ", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE)));
2870 hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2871 }
2872 }
2873 break;
2874 default:
2875 break;
2876 }
2877
2878 return;
2879 trunc:
2880 ND_PRINT((ndo, "[|BGP]"));
2881 }
2882
2883 static void
2884 bgp_route_refresh_print(netdissect_options *ndo,
2885 const u_char *pptr, u_int len)
2886 {
2887 const struct bgp_route_refresh *bgp_route_refresh_header;
2888
2889 ND_TCHECK_LEN(pptr, BGP_ROUTE_REFRESH_SIZE);
2890
2891 /* some little sanity checking */
2892 if (len<BGP_ROUTE_REFRESH_SIZE)
2893 return;
2894
2895 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2896
2897 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)",
2898 tok2str(af_values,"Unknown",
2899 EXTRACT_BE_U_2(bgp_route_refresh_header->afi)),
2900 EXTRACT_BE_U_2(bgp_route_refresh_header->afi),
2901 tok2str(bgp_safi_values,"Unknown",
2902 EXTRACT_U_1(bgp_route_refresh_header->safi)),
2903 EXTRACT_U_1(bgp_route_refresh_header->safi)));
2904
2905 if (ndo->ndo_vflag > 1) {
2906 ND_TCHECK_LEN(pptr, len);
2907 print_unknown_data(ndo, pptr, "\n\t ", len);
2908 }
2909
2910 return;
2911 trunc:
2912 ND_PRINT((ndo, "[|BGP]"));
2913 }
2914
2915 static int
2916 bgp_pdu_print(netdissect_options *ndo,
2917 const u_char *dat, u_int length)
2918 {
2919 const struct bgp *bgp_header;
2920 uint8_t bgp_type;
2921
2922 ND_TCHECK_LEN(dat, BGP_SIZE);
2923 bgp_header = (const struct bgp *)dat;
2924 bgp_type = EXTRACT_U_1(bgp_header->bgp_type);
2925
2926 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2927 tok2str(bgp_msg_values, "Unknown", bgp_type),
2928 bgp_type,
2929 length));
2930
2931 switch (bgp_type) {
2932 case BGP_OPEN:
2933 bgp_open_print(ndo, dat, length);
2934 break;
2935 case BGP_UPDATE:
2936 bgp_update_print(ndo, dat, length);
2937 break;
2938 case BGP_NOTIFICATION:
2939 bgp_notification_print(ndo, dat, length);
2940 break;
2941 case BGP_KEEPALIVE:
2942 break;
2943 case BGP_ROUTE_REFRESH:
2944 bgp_route_refresh_print(ndo, dat, length);
2945 break;
2946 default:
2947 /* we have no decoder for the BGP message */
2948 ND_TCHECK_LEN(dat, length);
2949 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp_type));
2950 print_unknown_data(ndo, dat, "\n\t ", length);
2951 break;
2952 }
2953 return 1;
2954 trunc:
2955 ND_PRINT((ndo, "[|BGP]"));
2956 return 0;
2957 }
2958
2959 void
2960 bgp_print(netdissect_options *ndo,
2961 const u_char *dat, u_int length)
2962 {
2963 const u_char *p;
2964 const u_char *ep;
2965 const u_char *start;
2966 const u_char marker[] = {
2967 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2968 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2969 };
2970 const struct bgp *bgp_header;
2971 uint16_t hlen;
2972
2973 ep = dat + length;
2974 if (ndo->ndo_snapend < dat + length)
2975 ep = ndo->ndo_snapend;
2976
2977 ND_PRINT((ndo, ": BGP"));
2978
2979 if (ndo->ndo_vflag < 1) /* lets be less chatty */
2980 return;
2981
2982 p = dat;
2983 start = p;
2984 while (p < ep) {
2985 if (!ND_TTEST_1(p))
2986 break;
2987 if (EXTRACT_U_1(p) != 0xff) {
2988 p++;
2989 continue;
2990 }
2991
2992 if (!ND_TTEST_LEN(p, sizeof(marker)))
2993 break;
2994 if (memcmp(p, marker, sizeof(marker)) != 0) {
2995 p++;
2996 continue;
2997 }
2998
2999 /* found BGP header */
3000 ND_TCHECK_LEN(p, BGP_SIZE);
3001 bgp_header = (const struct bgp *)p;
3002
3003 if (start != p)
3004 ND_PRINT((ndo, " [|BGP]"));
3005
3006 hlen = EXTRACT_BE_U_2(bgp_header->bgp_len);
3007 if (hlen < BGP_SIZE) {
3008 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
3009 BGP_SIZE));
3010 break;
3011 }
3012
3013 if (ND_TTEST_LEN(p, hlen)) {
3014 if (!bgp_pdu_print(ndo, p, hlen))
3015 return;
3016 p += hlen;
3017 start = p;
3018 } else {
3019 ND_PRINT((ndo, "\n[|BGP %s]",
3020 tok2str(bgp_msg_values,
3021 "Unknown Message Type",
3022 EXTRACT_U_1(bgp_header->bgp_type))));
3023 break;
3024 }
3025 }
3026
3027 return;
3028
3029 trunc:
3030 ND_PRINT((ndo, " [|BGP]"));
3031 }
3032
3033 /*
3034 * Local Variables:
3035 * c-style: whitesmith
3036 * c-basic-offset: 4
3037 * End:
3038 */
[mirror] the TCPdump network dissector