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