]> The Tcpdump Group git mirrors - tcpdump/blob - print-bgp.c
projects / tcpdump / blob
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
Use ND_TTEST_SIZE()/ND_TCHECK_SIZE() macros (2/n)
[tcpdump] / print-bgp.c
1 /*
2 * Copyright (C) 1999 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * Extensively modified by Hannes Gredler (hannes@gredler.at) for more
30 * complete BGP support.
31 */
32
33 /* \summary: Border Gateway Protocol (BGP) printer */
34
35 /* specification: RFC 4271 */
36
37 #ifdef HAVE_CONFIG_H
38 #include "config.h"
39 #endif
40
41 #include <netdissect-stdinc.h>
42
43 #include <stdio.h>
44 #include <string.h>
45
46 #include "netdissect.h"
47 #include "addrtoname.h"
48 #include "extract.h"
49 #include "af.h"
50 #include "l2vpn.h"
51
52 struct bgp {
53 nd_byte bgp_marker[16];
54 nd_uint16_t bgp_len;
55 nd_uint8_t bgp_type;
56 };
57 #define BGP_SIZE 19 /* unaligned */
58
59 #define BGP_OPEN 1
60 #define BGP_UPDATE 2
61 #define BGP_NOTIFICATION 3
62 #define BGP_KEEPALIVE 4
63 #define BGP_ROUTE_REFRESH 5
64
65 static const struct tok bgp_msg_values[] = {
66 { BGP_OPEN, "Open"},
67 { BGP_UPDATE, "Update"},
68 { BGP_NOTIFICATION, "Notification"},
69 { BGP_KEEPALIVE, "Keepalive"},
70 { BGP_ROUTE_REFRESH, "Route Refresh"},
71 { 0, NULL}
72 };
73
74 struct bgp_open {
75 nd_byte bgpo_marker[16];
76 nd_uint16_t bgpo_len;
77 nd_uint8_t bgpo_type;
78 nd_uint8_t bgpo_version;
79 nd_uint16_t bgpo_myas;
80 nd_uint16_t bgpo_holdtime;
81 nd_uint32_t bgpo_id;
82 nd_uint8_t bgpo_optlen;
83 /* options should follow */
84 };
85 #define BGP_OPEN_SIZE 29 /* unaligned */
86
87 struct bgp_opt {
88 nd_uint8_t bgpopt_type;
89 nd_uint8_t bgpopt_len;
90 /* variable length */
91 };
92 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
93 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
94
95 struct bgp_notification {
96 nd_byte bgpn_marker[16];
97 nd_uint16_t bgpn_len;
98 nd_uint8_t bgpn_type;
99 nd_uint8_t bgpn_major;
100 nd_uint8_t bgpn_minor;
101 };
102 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
103
104 struct bgp_route_refresh {
105 nd_byte bgp_marker[16];
106 nd_uint16_t len;
107 nd_uint8_t type; /* No padding after this; afi is, in fact, not aligned */
108 nd_uint16_t afi;
109 nd_uint8_t res;
110 nd_uint8_t safi;
111 };
112 #define BGP_ROUTE_REFRESH_SIZE 23
113
114 #define bgp_attr_lenlen(flags, p) \
115 (((flags) & 0x10) ? 2U : 1U)
116 #define bgp_attr_len(flags, p) \
117 (((flags) & 0x10) ? 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 /*
1409 * Scan through the NLRI information under the assumpetion that
1410 * it doesn't have path IDs.
1411 */
1412 for (offset = 0; offset < length;) {
1413 offset += 4;
1414 if (!ND_TTEST_1(pptr + offset)) {
1415 /* We ran out of captured data; quit scanning. */
1416 break;
1417 }
1418 prefix_length = EXTRACT_U_1(pptr + offset);
1419 /*
1420 * Add 4 to cover the path id
1421 * and check the prefix length isn't greater than 32/128.
1422 */
1423 if (prefix_length > max_prefix_length) {
1424 return 0;
1425 }
1426 /* Add 1 for the prefix_length byte and prefix_length to cover the address */
1427 offset += 1 + ((prefix_length + 7) / 8);
1428 }
1429 /* check we haven't gone past the end of the section */
1430 if (offset > length) {
1431 return 0;
1432 }
1433
1434 /* check it's not standard BGP */
1435 for (offset = 0; offset < length; ) {
1436 if (!ND_TTEST_1(pptr + offset)) {
1437 /* We ran out of captured data; quit scanning. */
1438 break;
1439 }
1440 prefix_length = EXTRACT_U_1(pptr + offset);
1441 /*
1442 * If the prefix_length is zero (0.0.0.0/0)
1443 * and since it's not the only address (length >= 5)
1444 * then it is add-path
1445 */
1446 if (prefix_length < 1 || prefix_length > max_prefix_length) {
1447 return 1;
1448 }
1449 offset += 1 + ((prefix_length + 7) / 8);
1450 }
1451 if (offset > length) {
1452 return 1;
1453 }
1454
1455 /* assume not add-path by default */
1456 return 0;
1457 }
1458
1459 static int
1460 bgp_attr_print(netdissect_options *ndo,
1461 u_int atype, const u_char *pptr, u_int len)
1462 {
1463 u_int i;
1464 uint16_t af;
1465 uint8_t safi, snpa, nhlen;
1466 union { /* copy buffer for bandwidth values */
1467 float f;
1468 uint32_t i;
1469 } bw;
1470 int advance;
1471 u_int tlen;
1472 const u_char *tptr;
1473 char buf[MAXHOSTNAMELEN + 100];
1474 u_int as_size;
1475 int add_path4, add_path6;
1476 u_int path_id = 0;
1477
1478 tptr = pptr;
1479 tlen = len;
1480
1481 switch (atype) {
1482 case BGPTYPE_ORIGIN:
1483 if (len != 1)
1484 ND_PRINT((ndo, "invalid len"));
1485 else {
1486 ND_TCHECK_1(tptr);
1487 ND_PRINT((ndo, "%s", tok2str(bgp_origin_values,
1488 "Unknown Origin Typecode",
1489 EXTRACT_U_1(tptr))));
1490 }
1491 break;
1492
1493 /*
1494 * Process AS4 byte path and AS2 byte path attributes here.
1495 */
1496 case BGPTYPE_AS4_PATH:
1497 case BGPTYPE_AS_PATH:
1498 if (len % 2) {
1499 ND_PRINT((ndo, "invalid len"));
1500 break;
1501 }
1502 if (!len) {
1503 ND_PRINT((ndo, "empty"));
1504 break;
1505 }
1506
1507 /*
1508 * BGP updates exchanged between New speakers that support 4
1509 * byte AS, ASs are always encoded in 4 bytes. There is no
1510 * definitive way to find this, just by the packet's
1511 * contents. So, check for packet's TLV's sanity assuming
1512 * 2 bytes first, and it does not pass, assume that ASs are
1513 * encoded in 4 bytes format and move on.
1514 */
1515 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1516
1517 while (tptr < pptr + len) {
1518 ND_TCHECK_1(tptr);
1519 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values,
1520 "?", EXTRACT_U_1(tptr))));
1521 ND_TCHECK_1(tptr + 1);
1522 for (i = 0; i < EXTRACT_U_1(tptr + 1) * as_size; i += as_size) {
1523 ND_TCHECK_LEN(tptr + 2 + i, as_size);
1524 ND_PRINT((ndo, "%s ",
1525 as_printf(ndo, astostr, sizeof(astostr),
1526 as_size == 2 ?
1527 EXTRACT_BE_U_2(tptr + i + 2) :
1528 EXTRACT_BE_U_4(tptr + i + 2))));
1529 }
1530 ND_TCHECK_1(tptr);
1531 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values,
1532 "?", EXTRACT_U_1(tptr))));
1533 ND_TCHECK_1(tptr + 1);
1534 tptr += 2 + EXTRACT_U_1(tptr + 1) * as_size;
1535 }
1536 break;
1537 case BGPTYPE_NEXT_HOP:
1538 if (len != 4)
1539 ND_PRINT((ndo, "invalid len"));
1540 else {
1541 ND_TCHECK_4(tptr);
1542 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1543 }
1544 break;
1545 case BGPTYPE_MULTI_EXIT_DISC:
1546 case BGPTYPE_LOCAL_PREF:
1547 if (len != 4)
1548 ND_PRINT((ndo, "invalid len"));
1549 else {
1550 ND_TCHECK_4(tptr);
1551 ND_PRINT((ndo, "%u", EXTRACT_BE_U_4(tptr)));
1552 }
1553 break;
1554 case BGPTYPE_ATOMIC_AGGREGATE:
1555 if (len != 0)
1556 ND_PRINT((ndo, "invalid len"));
1557 break;
1558 case BGPTYPE_AGGREGATOR:
1559
1560 /*
1561 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1562 * the length of this PA can be either 6 bytes or 8 bytes.
1563 */
1564 if (len != 6 && len != 8) {
1565 ND_PRINT((ndo, "invalid len"));
1566 break;
1567 }
1568 ND_TCHECK_LEN(tptr, len);
1569 if (len == 6) {
1570 ND_PRINT((ndo, " AS #%s, origin %s",
1571 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(tptr)),
1572 ipaddr_string(ndo, tptr + 2)));
1573 } else {
1574 ND_PRINT((ndo, " AS #%s, origin %s",
1575 as_printf(ndo, astostr, sizeof(astostr),
1576 EXTRACT_BE_U_4(tptr)), ipaddr_string(ndo, tptr + 4)));
1577 }
1578 break;
1579 case BGPTYPE_AGGREGATOR4:
1580 if (len != 8) {
1581 ND_PRINT((ndo, "invalid len"));
1582 break;
1583 }
1584 ND_TCHECK_8(tptr);
1585 ND_PRINT((ndo, " AS #%s, origin %s",
1586 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr)),
1587 ipaddr_string(ndo, tptr + 4)));
1588 break;
1589 case BGPTYPE_COMMUNITIES:
1590 if (len % 4) {
1591 ND_PRINT((ndo, "invalid len"));
1592 break;
1593 }
1594 while (tlen != 0) {
1595 uint32_t comm;
1596 ND_TCHECK_4(tptr);
1597 if (tlen < 4)
1598 goto trunc;
1599 comm = EXTRACT_BE_U_4(tptr);
1600 switch (comm) {
1601 case BGP_COMMUNITY_NO_EXPORT:
1602 ND_PRINT((ndo, " NO_EXPORT"));
1603 break;
1604 case BGP_COMMUNITY_NO_ADVERT:
1605 ND_PRINT((ndo, " NO_ADVERTISE"));
1606 break;
1607 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1608 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1609 break;
1610 default:
1611 ND_PRINT((ndo, "%u:%u%s",
1612 (comm >> 16) & 0xffff,
1613 comm & 0xffff,
1614 (tlen>4) ? ", " : ""));
1615 break;
1616 }
1617 tlen -=4;
1618 tptr +=4;
1619 }
1620 break;
1621 case BGPTYPE_ORIGINATOR_ID:
1622 if (len != 4) {
1623 ND_PRINT((ndo, "invalid len"));
1624 break;
1625 }
1626 ND_TCHECK_4(tptr);
1627 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1628 break;
1629 case BGPTYPE_CLUSTER_LIST:
1630 if (len % 4) {
1631 ND_PRINT((ndo, "invalid len"));
1632 break;
1633 }
1634 while (tlen != 0) {
1635 ND_TCHECK_4(tptr);
1636 if (tlen < 4)
1637 goto trunc;
1638 ND_PRINT((ndo, "%s%s",
1639 ipaddr_string(ndo, tptr),
1640 (tlen>4) ? ", " : ""));
1641 tlen -=4;
1642 tptr +=4;
1643 }
1644 break;
1645 case BGPTYPE_MP_REACH_NLRI:
1646 ND_TCHECK_3(tptr);
1647 af = EXTRACT_BE_U_2(tptr);
1648 safi = EXTRACT_U_1(tptr + 2);
1649
1650 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1651 tok2str(af_values, "Unknown AFI", af),
1652 af,
1653 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1654 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1655 safi));
1656
1657 switch(af<<8 | safi) {
1658 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1659 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1660 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1661 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1662 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1663 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1664 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1665 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1666 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1667 case (AFNUM_INET<<8 | SAFNUM_MDT):
1668 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1669 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1670 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1671 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1672 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1673 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1674 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1675 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1676 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1677 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1678 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1679 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1680 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1681 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1682 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1683 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1684 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1685 break;
1686 default:
1687 ND_TCHECK_LEN(tptr, tlen);
1688 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1689 if (ndo->ndo_vflag <= 1)
1690 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1691 goto done;
1692 break;
1693 }
1694
1695 tptr +=3;
1696
1697 ND_TCHECK_1(tptr);
1698 nhlen = EXTRACT_U_1(tptr);
1699 tlen = nhlen;
1700 tptr++;
1701
1702 if (tlen) {
1703 u_int nnh = 0;
1704 ND_PRINT((ndo, "\n\t nexthop: "));
1705 while (tlen != 0) {
1706 if (nnh++ > 0) {
1707 ND_PRINT((ndo, ", " ));
1708 }
1709 switch(af<<8 | safi) {
1710 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1711 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1712 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1713 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1714 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1715 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1716 case (AFNUM_INET<<8 | SAFNUM_MDT):
1717 if (tlen < sizeof(struct in_addr)) {
1718 ND_PRINT((ndo, "invalid len"));
1719 tlen = 0;
1720 } else {
1721 ND_TCHECK_LEN(tptr, sizeof(struct in_addr));
1722 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1723 tlen -= sizeof(struct in_addr);
1724 tptr += sizeof(struct in_addr);
1725 }
1726 break;
1727 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1728 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1729 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1730 if (tlen < sizeof(struct in_addr)+BGP_VPN_RD_LEN) {
1731 ND_PRINT((ndo, "invalid len"));
1732 tlen = 0;
1733 } else {
1734 ND_TCHECK_LEN(tptr,
1735 sizeof(struct in_addr) + BGP_VPN_RD_LEN);
1736 ND_PRINT((ndo, "RD: %s, %s",
1737 bgp_vpn_rd_print(ndo, tptr),
1738 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1739 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1740 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1741 }
1742 break;
1743 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1744 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1745 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1746 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1747 if (tlen < sizeof(struct in6_addr)) {
1748 ND_PRINT((ndo, "invalid len"));
1749 tlen = 0;
1750 } else {
1751 ND_TCHECK_LEN(tptr, sizeof(struct in6_addr));
1752 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr)));
1753 tlen -= sizeof(struct in6_addr);
1754 tptr += sizeof(struct in6_addr);
1755 }
1756 break;
1757 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1758 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1759 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1760 if (tlen < sizeof(struct in6_addr)+BGP_VPN_RD_LEN) {
1761 ND_PRINT((ndo, "invalid len"));
1762 tlen = 0;
1763 } else {
1764 ND_TCHECK_LEN(tptr,
1765 sizeof(struct in6_addr) + BGP_VPN_RD_LEN);
1766 ND_PRINT((ndo, "RD: %s, %s",
1767 bgp_vpn_rd_print(ndo, tptr),
1768 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1769 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1770 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1771 }
1772 break;
1773 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1774 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1775 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1776 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1777 if (tlen < sizeof(struct in_addr)) {
1778 ND_PRINT((ndo, "invalid len"));
1779 tlen = 0;
1780 } else {
1781 ND_TCHECK_LEN(tptr, sizeof(struct in_addr));
1782 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1783 tlen -= (sizeof(struct in_addr));
1784 tptr += (sizeof(struct in_addr));
1785 }
1786 break;
1787 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1788 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1789 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1790 ND_TCHECK_LEN(tptr, tlen);
1791 ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen)));
1792 tptr += tlen;
1793 tlen = 0;
1794 break;
1795
1796 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1797 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1798 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1799 if (tlen < BGP_VPN_RD_LEN+1) {
1800 ND_PRINT((ndo, "invalid len"));
1801 tlen = 0;
1802 } else {
1803 ND_TCHECK_LEN(tptr, tlen);
1804 ND_PRINT((ndo, "RD: %s, %s",
1805 bgp_vpn_rd_print(ndo, tptr),
1806 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1807 /* rfc986 mapped IPv4 address ? */
1808 if (EXTRACT_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
1809 ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4)));
1810 /* rfc1888 mapped IPv6 address ? */
1811 else if (EXTRACT_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
1812 ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3)));
1813 tptr += tlen;
1814 tlen = 0;
1815 }
1816 break;
1817 default:
1818 ND_TCHECK_LEN(tptr, tlen);
1819 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1820 if (ndo->ndo_vflag <= 1)
1821 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1822 tptr += tlen;
1823 tlen = 0;
1824 goto done;
1825 break;
1826 }
1827 }
1828 }
1829 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1830 tptr += tlen;
1831
1832 ND_TCHECK_1(tptr);
1833 snpa = EXTRACT_U_1(tptr);
1834 tptr++;
1835
1836 if (snpa) {
1837 ND_PRINT((ndo, "\n\t %u SNPA", snpa));
1838 for (/*nothing*/; snpa != 0; snpa--) {
1839 ND_TCHECK_1(tptr);
1840 ND_PRINT((ndo, "\n\t %u bytes", EXTRACT_U_1(tptr)));
1841 tptr += EXTRACT_U_1(tptr) + 1;
1842 }
1843 } else {
1844 ND_PRINT((ndo, ", no SNPA"));
1845 }
1846
1847 add_path4 = check_add_path(ndo, tptr, (len-(tptr - pptr)), 32);
1848 add_path6 = check_add_path(ndo, tptr, (len-(tptr - pptr)), 128);
1849
1850 while (tptr < pptr + len) {
1851 switch (af<<8 | safi) {
1852 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1853 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1854 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1855 if (add_path4) {
1856 path_id = EXTRACT_BE_U_4(tptr);
1857 tptr += 4;
1858 }
1859 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1860 if (advance == -1)
1861 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1862 else if (advance == -2)
1863 goto trunc;
1864 else if (advance == -3)
1865 break; /* bytes left, but not enough */
1866 else
1867 ND_PRINT((ndo, "\n\t %s", buf));
1868 if (add_path4) {
1869 ND_PRINT((ndo, " Path Id: %u", path_id));
1870 }
1871 break;
1872 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1873 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1874 if (advance == -1)
1875 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1876 else if (advance == -2)
1877 goto trunc;
1878 else if (advance == -3)
1879 break; /* bytes left, but not enough */
1880 else
1881 ND_PRINT((ndo, "\n\t %s", buf));
1882 break;
1883 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1884 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1885 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1886 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1887 if (advance == -1)
1888 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1889 else if (advance == -2)
1890 goto trunc;
1891 else
1892 ND_PRINT((ndo, "\n\t %s", buf));
1893 break;
1894 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1895 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf));
1896 if (advance == -1)
1897 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1898 else if (advance == -2)
1899 goto trunc;
1900 else
1901 ND_PRINT((ndo, "\n\t %s", buf));
1902 break;
1903 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1904 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1905 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1906 if (advance == -1)
1907 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1908 else if (advance == -2)
1909 goto trunc;
1910 else
1911 ND_PRINT((ndo, "\n\t %s", buf));
1912 break;
1913
1914 case (AFNUM_INET<<8 | SAFNUM_MDT):
1915 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1916 if (advance == -1)
1917 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1918 else if (advance == -2)
1919 goto trunc;
1920 else
1921 ND_PRINT((ndo, "\n\t %s", buf));
1922 break;
1923 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1924 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1925 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1926 if (add_path6) {
1927 path_id = EXTRACT_BE_U_4(tptr);
1928 tptr += 4;
1929 }
1930 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1931 if (advance == -1)
1932 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1933 else if (advance == -2)
1934 goto trunc;
1935 else if (advance == -3)
1936 break; /* bytes left, but not enough */
1937 else
1938 ND_PRINT((ndo, "\n\t %s", buf));
1939 if (add_path6) {
1940 ND_PRINT((ndo, " Path Id: %u", path_id));
1941 }
1942 break;
1943 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1944 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1945 if (advance == -1)
1946 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1947 else if (advance == -2)
1948 goto trunc;
1949 else if (advance == -3)
1950 break; /* bytes left, but not enough */
1951 else
1952 ND_PRINT((ndo, "\n\t %s", buf));
1953 break;
1954 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1955 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1956 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1957 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1958 if (advance == -1)
1959 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1960 else if (advance == -2)
1961 goto trunc;
1962 else
1963 ND_PRINT((ndo, "\n\t %s", buf));
1964 break;
1965 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1966 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1967 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1968 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1969 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1970 if (advance == -1)
1971 ND_PRINT((ndo, "\n\t (illegal length)"));
1972 else if (advance == -2)
1973 goto trunc;
1974 else
1975 ND_PRINT((ndo, "\n\t %s", buf));
1976 break;
1977 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1978 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1979 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1980 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1981 if (advance == -1)
1982 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1983 else if (advance == -2)
1984 goto trunc;
1985 else
1986 ND_PRINT((ndo, "\n\t %s", buf));
1987 break;
1988 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1989 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1990 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1991 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1992 if (advance == -1)
1993 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1994 else if (advance == -2)
1995 goto trunc;
1996 else
1997 ND_PRINT((ndo, "\n\t %s", buf));
1998 break;
1999 default:
2000 ND_TCHECK_LEN(tptr, tlen);
2001 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
2002 if (ndo->ndo_vflag <= 1)
2003 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2004 advance = 0;
2005 tptr = pptr + len;
2006 break;
2007 }
2008 if (advance < 0)
2009 break;
2010 tptr += advance;
2011 }
2012 done:
2013 break;
2014
2015 case BGPTYPE_MP_UNREACH_NLRI:
2016 ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
2017 af = EXTRACT_BE_U_2(tptr);
2018 safi = EXTRACT_U_1(tptr + 2);
2019
2020 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
2021 tok2str(af_values, "Unknown AFI", af),
2022 af,
2023 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
2024 tok2str(bgp_safi_values, "Unknown SAFI", safi),
2025 safi));
2026
2027 if (len == BGP_MP_NLRI_MINSIZE)
2028 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2029
2030 tptr += 3;
2031
2032 add_path4 = check_add_path(ndo, tptr, (len-(tptr - pptr)), 32);
2033 add_path6 = check_add_path(ndo, tptr, (len-(tptr - pptr)), 128);
2034
2035 while (tptr < pptr + len) {
2036 switch (af<<8 | safi) {
2037 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
2038 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
2039 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
2040 if (add_path4) {
2041 path_id = EXTRACT_BE_U_4(tptr);
2042 tptr += 4;
2043 }
2044 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
2045 if (advance == -1)
2046 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2047 else if (advance == -2)
2048 goto trunc;
2049 else if (advance == -3)
2050 break; /* bytes left, but not enough */
2051 else
2052 ND_PRINT((ndo, "\n\t %s", buf));
2053 if (add_path4) {
2054 ND_PRINT((ndo, " Path Id: %u", path_id));
2055 }
2056 break;
2057 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
2058 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
2059 if (advance == -1)
2060 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2061 else if (advance == -2)
2062 goto trunc;
2063 else if (advance == -3)
2064 break; /* bytes left, but not enough */
2065 else
2066 ND_PRINT((ndo, "\n\t %s", buf));
2067 break;
2068 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
2069 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
2070 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
2071 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
2072 if (advance == -1)
2073 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2074 else if (advance == -2)
2075 goto trunc;
2076 else
2077 ND_PRINT((ndo, "\n\t %s", buf));
2078 break;
2079 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
2080 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
2081 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
2082 if (add_path6) {
2083 path_id = EXTRACT_BE_U_4(tptr);
2084 tptr += 4;
2085 }
2086 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
2087 if (advance == -1)
2088 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2089 else if (advance == -2)
2090 goto trunc;
2091 else if (advance == -3)
2092 break; /* bytes left, but not enough */
2093 else
2094 ND_PRINT((ndo, "\n\t %s", buf));
2095 if (add_path6) {
2096 ND_PRINT((ndo, " Path Id: %u", path_id));
2097 }
2098 break;
2099 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
2100 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
2101 if (advance == -1)
2102 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2103 else if (advance == -2)
2104 goto trunc;
2105 else if (advance == -3)
2106 break; /* bytes left, but not enough */
2107 else
2108 ND_PRINT((ndo, "\n\t %s", buf));
2109 break;
2110 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
2111 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
2112 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
2113 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
2114 if (advance == -1)
2115 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2116 else if (advance == -2)
2117 goto trunc;
2118 else
2119 ND_PRINT((ndo, "\n\t %s", buf));
2120 break;
2121 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
2122 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2123 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2124 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2125 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
2126 if (advance == -1)
2127 ND_PRINT((ndo, "\n\t (illegal length)"));
2128 else if (advance == -2)
2129 goto trunc;
2130 else
2131 ND_PRINT((ndo, "\n\t %s", buf));
2132 break;
2133 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2134 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2135 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2136 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2137 if (advance == -1)
2138 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2139 else if (advance == -2)
2140 goto trunc;
2141 else
2142 ND_PRINT((ndo, "\n\t %s", buf));
2143 break;
2144 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2145 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2146 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2147 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2148 if (advance == -1)
2149 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2150 else if (advance == -2)
2151 goto trunc;
2152 else
2153 ND_PRINT((ndo, "\n\t %s", buf));
2154 break;
2155 case (AFNUM_INET<<8 | SAFNUM_MDT):
2156 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
2157 if (advance == -1)
2158 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2159 else if (advance == -2)
2160 goto trunc;
2161 else
2162 ND_PRINT((ndo, "\n\t %s", buf));
2163 break;
2164 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
2165 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
2166 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
2167 if (advance == -1)
2168 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2169 else if (advance == -2)
2170 goto trunc;
2171 else
2172 ND_PRINT((ndo, "\n\t %s", buf));
2173 break;
2174 default:
2175 ND_TCHECK_LEN(tptr - 3, tlen);
2176 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
2177 if (ndo->ndo_vflag <= 1)
2178 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
2179 advance = 0;
2180 tptr = pptr + len;
2181 break;
2182 }
2183 if (advance < 0)
2184 break;
2185 tptr += advance;
2186 }
2187 break;
2188 case BGPTYPE_EXTD_COMMUNITIES:
2189 if (len % 8) {
2190 ND_PRINT((ndo, "invalid len"));
2191 break;
2192 }
2193 while (tlen != 0) {
2194 uint16_t extd_comm;
2195
2196 ND_TCHECK_2(tptr);
2197 if (tlen < 2)
2198 goto trunc;
2199 extd_comm=EXTRACT_BE_U_2(tptr);
2200
2201 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]",
2202 tok2str(bgp_extd_comm_subtype_values,
2203 "unknown extd community typecode",
2204 extd_comm),
2205 extd_comm,
2206 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2207
2208 ND_TCHECK_6(tptr + 2);
2209 if (tlen < 8)
2210 goto trunc;
2211 switch(extd_comm) {
2212 case BGP_EXT_COM_RT_0:
2213 case BGP_EXT_COM_RO_0:
2214 case BGP_EXT_COM_L2VPN_RT_0:
2215 ND_PRINT((ndo, ": %u:%u (= %s)",
2216 EXTRACT_BE_U_2(tptr + 2),
2217 EXTRACT_BE_U_4(tptr + 4),
2218 ipaddr_string(ndo, tptr+4)));
2219 break;
2220 case BGP_EXT_COM_RT_1:
2221 case BGP_EXT_COM_RO_1:
2222 case BGP_EXT_COM_L2VPN_RT_1:
2223 case BGP_EXT_COM_VRF_RT_IMP:
2224 ND_PRINT((ndo, ": %s:%u",
2225 ipaddr_string(ndo, tptr+2),
2226 EXTRACT_BE_U_2(tptr + 6)));
2227 break;
2228 case BGP_EXT_COM_RT_2:
2229 case BGP_EXT_COM_RO_2:
2230 ND_PRINT((ndo, ": %s:%u",
2231 as_printf(ndo, astostr, sizeof(astostr),
2232 EXTRACT_BE_U_4(tptr + 2)), EXTRACT_BE_U_2(tptr + 6)));
2233 break;
2234 case BGP_EXT_COM_LINKBAND:
2235 bw.i = EXTRACT_BE_U_4(tptr + 2);
2236 ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2237 bw.f*8/1000000));
2238 break;
2239 case BGP_EXT_COM_VPN_ORIGIN:
2240 case BGP_EXT_COM_VPN_ORIGIN2:
2241 case BGP_EXT_COM_VPN_ORIGIN3:
2242 case BGP_EXT_COM_VPN_ORIGIN4:
2243 case BGP_EXT_COM_OSPF_RID:
2244 case BGP_EXT_COM_OSPF_RID2:
2245 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2)));
2246 break;
2247 case BGP_EXT_COM_OSPF_RTYPE:
2248 case BGP_EXT_COM_OSPF_RTYPE2:
2249 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2250 ipaddr_string(ndo, tptr+2),
2251 tok2str(bgp_extd_comm_ospf_rtype_values,
2252 "unknown (0x%02x)",
2253 EXTRACT_U_1((tptr + 6))),
2254 (EXTRACT_U_1(tptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2255 ((EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_EXT) || (EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2256 break;
2257 case BGP_EXT_COM_L2INFO:
2258 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2259 tok2str(l2vpn_encaps_values,
2260 "unknown encaps",
2261 EXTRACT_U_1((tptr + 2))),
2262 EXTRACT_U_1((tptr + 3)),
2263 EXTRACT_BE_U_2(tptr + 4)));
2264 break;
2265 case BGP_EXT_COM_SOURCE_AS:
2266 ND_PRINT((ndo, ": AS %u", EXTRACT_BE_U_2(tptr + 2)));
2267 break;
2268 default:
2269 ND_TCHECK_8(tptr);
2270 print_unknown_data(ndo, tptr, "\n\t ", 8);
2271 break;
2272 }
2273 tlen -= 8;
2274 tptr += 8;
2275 }
2276 break;
2277
2278 case BGPTYPE_PMSI_TUNNEL:
2279 {
2280 uint8_t tunnel_type, flags;
2281
2282 ND_TCHECK_5(tptr);
2283 flags = EXTRACT_U_1(tptr);
2284 tunnel_type = EXTRACT_U_1(tptr + 1);
2285 tlen = len;
2286
2287 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2288 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2289 tunnel_type,
2290 bittok2str(bgp_pmsi_flag_values, "none", flags),
2291 EXTRACT_BE_U_3(tptr + 2)>>4));
2292
2293 tptr +=5;
2294 tlen -= 5;
2295
2296 switch (tunnel_type) {
2297 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2298 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2299 ND_TCHECK_8(tptr);
2300 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s",
2301 ipaddr_string(ndo, tptr),
2302 ipaddr_string(ndo, tptr+4)));
2303 break;
2304
2305 case BGP_PMSI_TUNNEL_PIM_SSM:
2306 ND_TCHECK_8(tptr);
2307 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s",
2308 ipaddr_string(ndo, tptr),
2309 ipaddr_string(ndo, tptr+4)));
2310 break;
2311 case BGP_PMSI_TUNNEL_INGRESS:
2312 ND_TCHECK_4(tptr);
2313 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s",
2314 ipaddr_string(ndo, tptr)));
2315 break;
2316 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2317 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2318 ND_TCHECK_8(tptr);
2319 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x",
2320 ipaddr_string(ndo, tptr),
2321 EXTRACT_BE_U_4(tptr + 4)));
2322 break;
2323 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2324 ND_TCHECK_8(tptr);
2325 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2326 ipaddr_string(ndo, tptr),
2327 EXTRACT_BE_U_4(tptr + 4)));
2328 break;
2329 default:
2330 if (ndo->ndo_vflag <= 1) {
2331 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2332 }
2333 }
2334 break;
2335 }
2336 case BGPTYPE_AIGP:
2337 {
2338 uint8_t type;
2339 uint16_t length;
2340
2341 tlen = len;
2342
2343 while (tlen >= 3) {
2344
2345 ND_TCHECK_3(tptr);
2346
2347 type = EXTRACT_U_1(tptr);
2348 length = EXTRACT_BE_U_2(tptr + 1);
2349 tptr += 3;
2350 tlen -= 3;
2351
2352 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u",
2353 tok2str(bgp_aigp_values, "Unknown", type),
2354 type, length));
2355
2356 if (length < 3)
2357 goto trunc;
2358 length -= 3;
2359
2360 /*
2361 * Check if we can read the TLV data.
2362 */
2363 ND_TCHECK_LEN(tptr + 3, length);
2364
2365 switch (type) {
2366
2367 case BGP_AIGP_TLV:
2368 if (length < 8)
2369 goto trunc;
2370 ND_PRINT((ndo, ", metric %" PRIu64,
2371 EXTRACT_BE_U_8(tptr)));
2372 break;
2373
2374 default:
2375 if (ndo->ndo_vflag <= 1) {
2376 print_unknown_data(ndo, tptr,"\n\t ", length);
2377 }
2378 }
2379
2380 tptr += length;
2381 tlen -= length;
2382 }
2383 break;
2384 }
2385 case BGPTYPE_ATTR_SET:
2386 ND_TCHECK_4(tptr);
2387 if (len < 4)
2388 goto trunc;
2389 ND_PRINT((ndo, "\n\t Origin AS: %s",
2390 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr))));
2391 tptr += 4;
2392 len -= 4;
2393
2394 while (len) {
2395 u_int aflags, alenlen, alen;
2396
2397 ND_TCHECK_2(tptr);
2398 if (len < 2)
2399 goto trunc;
2400 aflags = EXTRACT_U_1(tptr);
2401 atype = EXTRACT_U_1(tptr + 1);
2402 tptr += 2;
2403 len -= 2;
2404 alenlen = bgp_attr_lenlen(aflags, tptr);
2405 ND_TCHECK_LEN(tptr, alenlen);
2406 if (len < alenlen)
2407 goto trunc;
2408 alen = bgp_attr_len(aflags, tptr);
2409 tptr += alenlen;
2410 len -= alenlen;
2411
2412 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2413 tok2str(bgp_attr_values,
2414 "Unknown Attribute", atype),
2415 atype,
2416 alen));
2417
2418 if (aflags) {
2419 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2420 aflags & 0x80 ? "O" : "",
2421 aflags & 0x40 ? "T" : "",
2422 aflags & 0x20 ? "P" : "",
2423 aflags & 0x10 ? "E" : ""));
2424 if (aflags & 0xf)
2425 ND_PRINT((ndo, "+%x", aflags & 0xf));
2426 ND_PRINT((ndo, "]: "));
2427 }
2428 /* FIXME check for recursion */
2429 if (!bgp_attr_print(ndo, atype, tptr, alen))
2430 return 0;
2431 tptr += alen;
2432 len -= alen;
2433 }
2434 break;
2435
2436 case BGPTYPE_LARGE_COMMUNITY:
2437 if (len == 0 || len % 12) {
2438 ND_PRINT((ndo, "invalid len"));
2439 break;
2440 }
2441 ND_PRINT((ndo, "\n\t "));
2442 while (len != 0) {
2443 ND_TCHECK_LEN(tptr, 12);
2444 ND_PRINT((ndo, "%u:%u:%u%s",
2445 EXTRACT_BE_U_4(tptr),
2446 EXTRACT_BE_U_4(tptr + 4),
2447 EXTRACT_BE_U_4(tptr + 8),
2448 (len > 12) ? ", " : ""));
2449 tptr += 12;
2450 /*
2451 * len will always be a multiple of 12, as per the above,
2452 * so this will never underflow.
2453 */
2454 len -= 12;
2455 }
2456 break;
2457 default:
2458 ND_TCHECK_LEN(pptr, len);
2459 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2460 if (ndo->ndo_vflag <= 1)
2461 print_unknown_data(ndo, pptr, "\n\t ", len);
2462 break;
2463 }
2464 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2465 ND_TCHECK_LEN(pptr, len);
2466 print_unknown_data(ndo, pptr, "\n\t ", len);
2467 }
2468 return 1;
2469
2470 trunc:
2471 return 0;
2472 }
2473
2474 static void
2475 bgp_capabilities_print(netdissect_options *ndo,
2476 const u_char *opt, u_int caps_len)
2477 {
2478 u_int cap_type, cap_len, tcap_len, cap_offset;
2479 u_int i = 0;
2480
2481 while (i < caps_len) {
2482 ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
2483 cap_type=EXTRACT_U_1(opt + i);
2484 cap_len=EXTRACT_U_1(opt + i + 1);
2485 tcap_len=cap_len;
2486 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2487 tok2str(bgp_capcode_values, "Unknown", cap_type),
2488 cap_type,
2489 cap_len));
2490 ND_TCHECK_LEN(opt + 2 + i, cap_len);
2491 switch (cap_type) {
2492 case BGP_CAPCODE_MP:
2493 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2494 tok2str(af_values, "Unknown", EXTRACT_BE_U_2(opt + i + 2)),
2495 EXTRACT_BE_U_2(opt + i + 2),
2496 tok2str(bgp_safi_values, "Unknown", EXTRACT_U_1(opt + i + 5)),
2497 EXTRACT_U_1(opt + i + 5)));
2498 break;
2499 case BGP_CAPCODE_RESTART:
2500 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2501 ((EXTRACT_U_1(opt + i + 2))&0x80) ? "R" : "none",
2502 EXTRACT_BE_U_2(opt + i + 2)&0xfff));
2503 tcap_len-=2;
2504 cap_offset=4;
2505 while(tcap_len>=4) {
2506 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2507 tok2str(af_values,"Unknown",
2508 EXTRACT_BE_U_2(opt + i + cap_offset)),
2509 EXTRACT_BE_U_2(opt + i + cap_offset),
2510 tok2str(bgp_safi_values,"Unknown",
2511 EXTRACT_U_1(opt + i + cap_offset + 2)),
2512 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2513 ((EXTRACT_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" ));
2514 tcap_len -= 4;
2515 cap_offset += 4;
2516 }
2517 break;
2518 case BGP_CAPCODE_RR:
2519 case BGP_CAPCODE_RR_CISCO:
2520 break;
2521 case BGP_CAPCODE_AS_NEW:
2522
2523 /*
2524 * Extract the 4 byte AS number encoded.
2525 */
2526 if (cap_len == 4) {
2527 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2528 as_printf(ndo, astostr, sizeof(astostr),
2529 EXTRACT_BE_U_4(opt + i + 2))));
2530 }
2531 break;
2532 case BGP_CAPCODE_ADD_PATH:
2533 cap_offset=2;
2534 if (tcap_len == 0) {
2535 ND_PRINT((ndo, " (bogus)")); /* length */
2536 break;
2537 }
2538 while (tcap_len != 0) {
2539 if (tcap_len < 4) {
2540 ND_PRINT((ndo, "\n\t\t(invalid)"));
2541 break;
2542 }
2543 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2544 tok2str(af_values,"Unknown",EXTRACT_BE_U_2(opt + i + cap_offset)),
2545 EXTRACT_BE_U_2(opt + i + cap_offset),
2546 tok2str(bgp_safi_values,"Unknown",EXTRACT_U_1(opt + i + cap_offset + 2)),
2547 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2548 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",EXTRACT_U_1(opt + i + cap_offset + 3))
2549 ));
2550 tcap_len -= 4;
2551 cap_offset += 4;
2552 }
2553 break;
2554 default:
2555 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2556 cap_type));
2557 if (ndo->ndo_vflag <= 1)
2558 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2559 cap_len);
2560 break;
2561 }
2562 if (ndo->ndo_vflag > 1 && cap_len != 0) {
2563 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2564 }
2565 i += BGP_CAP_HEADER_SIZE + cap_len;
2566 }
2567 return;
2568
2569 trunc:
2570 ND_PRINT((ndo, "[|BGP]"));
2571 }
2572
2573 static void
2574 bgp_open_print(netdissect_options *ndo,
2575 const u_char *dat, u_int length)
2576 {
2577 const struct bgp_open *bgp_open_header;
2578 u_int optslen;
2579 const struct bgp_opt *bgpopt;
2580 const u_char *opt;
2581 u_int i;
2582
2583 ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
2584 if (length < BGP_OPEN_SIZE)
2585 goto trunc;
2586
2587 bgp_open_header = (const struct bgp_open *)dat;
2588
2589 ND_PRINT((ndo, "\n\t Version %u, ",
2590 EXTRACT_U_1(bgp_open_header->bgpo_version)));
2591 ND_PRINT((ndo, "my AS %s, ",
2592 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(bgp_open_header->bgpo_myas))));
2593 ND_PRINT((ndo, "Holdtime %us, ",
2594 EXTRACT_BE_U_2(bgp_open_header->bgpo_holdtime)));
2595 ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgp_open_header->bgpo_id)));
2596 optslen = EXTRACT_U_1(bgp_open_header->bgpo_optlen);
2597 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", optslen));
2598
2599 opt = dat + BGP_OPEN_SIZE;
2600 length -= BGP_OPEN_SIZE;
2601
2602 i = 0;
2603 while (i < optslen) {
2604 uint8_t opt_type, opt_len;
2605
2606 ND_TCHECK_LEN(opt + i, BGP_OPT_SIZE);
2607 if (length < BGP_OPT_SIZE + i)
2608 goto trunc;
2609 bgpopt = (const struct bgp_opt *)(opt + i);
2610 opt_type = EXTRACT_U_1(bgpopt->bgpopt_type);
2611 opt_len = EXTRACT_U_1(bgpopt->bgpopt_len);
2612 if (BGP_OPT_SIZE + i + opt_len > optslen) {
2613 ND_PRINT((ndo, "\n\t Option %u, length: %u, goes past the end of the options",
2614 opt_type, opt_len));
2615 break;
2616 }
2617
2618 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u",
2619 tok2str(bgp_opt_values,"Unknown",opt_type),
2620 opt_type,
2621 opt_len));
2622
2623 /* now let's decode the options we know*/
2624 switch(opt_type) {
2625
2626 case BGP_OPT_CAP:
2627 bgp_capabilities_print(ndo, opt + BGP_OPT_SIZE + i,
2628 opt_len);
2629 break;
2630
2631 case BGP_OPT_AUTH:
2632 default:
2633 ND_PRINT((ndo, "\n\t no decoder for option %u",
2634 opt_type));
2635 break;
2636 }
2637 i += BGP_OPT_SIZE + opt_len;
2638 }
2639 return;
2640 trunc:
2641 ND_PRINT((ndo, "[|BGP]"));
2642 }
2643
2644 static void
2645 bgp_update_print(netdissect_options *ndo,
2646 const u_char *dat, u_int length)
2647 {
2648 const u_char *p;
2649 u_int withdrawn_routes_len;
2650 char buf[MAXHOSTNAMELEN + 100];
2651 int wpfx;
2652 u_int len;
2653 int i;
2654 int add_path;
2655 u_int path_id = 0;
2656
2657 ND_TCHECK_LEN(dat, BGP_SIZE);
2658 if (length < BGP_SIZE)
2659 goto trunc;
2660 p = dat + BGP_SIZE;
2661 length -= BGP_SIZE;
2662
2663 /* Unfeasible routes */
2664 ND_TCHECK_2(p);
2665 if (length < 2)
2666 goto trunc;
2667 withdrawn_routes_len = EXTRACT_BE_U_2(p);
2668 p += 2;
2669 length -= 2;
2670 if (withdrawn_routes_len > 1) {
2671 /*
2672 * Without keeping state from the original NLRI message,
2673 * it's not possible to tell if this a v4 or v6 route,
2674 * so only try to decode it if we're not v6 enabled.
2675 */
2676 ND_TCHECK_LEN(p, withdrawn_routes_len);
2677 if (length < withdrawn_routes_len)
2678 goto trunc;
2679 ND_PRINT((ndo, "\n\t Withdrawn routes:"));
2680 add_path = check_add_path(ndo, p, withdrawn_routes_len, 32);
2681 while (withdrawn_routes_len != 0) {
2682 if (add_path) {
2683 if (withdrawn_routes_len < 4) {
2684 p += withdrawn_routes_len;
2685 length -= withdrawn_routes_len;
2686 break;
2687 }
2688 path_id = EXTRACT_BE_U_4(p);
2689 p += 4;
2690 length -= 4;
2691 withdrawn_routes_len -= 4;
2692 }
2693 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
2694 if (wpfx == -1) {
2695 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2696 break;
2697 } else if (wpfx == -2)
2698 goto trunc;
2699 else if (wpfx == -3)
2700 goto trunc; /* bytes left, but not enough */
2701 else {
2702 ND_PRINT((ndo, "\n\t %s", buf));
2703 if (add_path) {
2704 ND_PRINT((ndo, " Path Id: %u", path_id));
2705 }
2706 p += wpfx;
2707 length -= wpfx;
2708 withdrawn_routes_len -= wpfx;
2709 }
2710 }
2711 } else {
2712 p += withdrawn_routes_len;
2713 length -= withdrawn_routes_len;
2714 }
2715
2716 ND_TCHECK_2(p);
2717 if (length < 2)
2718 goto trunc;
2719 len = EXTRACT_BE_U_2(p);
2720 p += 2;
2721 length -= 2;
2722
2723 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2724 /* No withdrawn routes, no path attributes, no NLRI */
2725 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2726 return;
2727 }
2728
2729 if (len) {
2730 /* do something more useful!*/
2731 while (len) {
2732 u_int aflags, atype, alenlen, alen;
2733
2734 ND_TCHECK_2(p);
2735 if (len < 2)
2736 goto trunc;
2737 if (length < 2)
2738 goto trunc;
2739 aflags = EXTRACT_U_1(p);
2740 atype = EXTRACT_U_1(p + 1);
2741 p += 2;
2742 len -= 2;
2743 length -= 2;
2744 alenlen = bgp_attr_lenlen(aflags, p);
2745 ND_TCHECK_LEN(p, alenlen);
2746 if (len < alenlen)
2747 goto trunc;
2748 if (length < alenlen)
2749 goto trunc;
2750 alen = bgp_attr_len(aflags, p);
2751 p += alenlen;
2752 len -= alenlen;
2753 length -= alenlen;
2754
2755 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2756 tok2str(bgp_attr_values, "Unknown Attribute", atype),
2757 atype,
2758 alen));
2759
2760 if (aflags) {
2761 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2762 aflags & 0x80 ? "O" : "",
2763 aflags & 0x40 ? "T" : "",
2764 aflags & 0x20 ? "P" : "",
2765 aflags & 0x10 ? "E" : ""));
2766 if (aflags & 0xf)
2767 ND_PRINT((ndo, "+%x", aflags & 0xf));
2768 ND_PRINT((ndo, "]: "));
2769 }
2770 if (len < alen)
2771 goto trunc;
2772 if (length < alen)
2773 goto trunc;
2774 if (!bgp_attr_print(ndo, atype, p, alen))
2775 goto trunc;
2776 p += alen;
2777 len -= alen;
2778 length -= alen;
2779 }
2780 }
2781
2782 if (length) {
2783 add_path = check_add_path(ndo, p, length, 32);
2784 ND_PRINT((ndo, "\n\t Updated routes:"));
2785 while (length != 0) {
2786 if (add_path) {
2787 path_id = EXTRACT_BE_U_4(p);
2788 p += 4;
2789 length -= 4;
2790 }
2791 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2792 if (i == -1) {
2793 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2794 break;
2795 } else if (i == -2)
2796 goto trunc;
2797 else if (i == -3)
2798 goto trunc; /* bytes left, but not enough */
2799 else {
2800 ND_PRINT((ndo, "\n\t %s", buf));
2801 if (add_path) {
2802 ND_PRINT((ndo, " Path Id: %u", path_id));
2803 }
2804 p += i;
2805 length -= i;
2806 }
2807 }
2808 }
2809 return;
2810 trunc:
2811 ND_PRINT((ndo, "[|BGP]"));
2812 }
2813
2814 static void
2815 bgp_notification_print(netdissect_options *ndo,
2816 const u_char *dat, u_int length)
2817 {
2818 const struct bgp_notification *bgp_notification_header;
2819 const u_char *tptr;
2820 uint8_t bgpn_major, bgpn_minor;
2821 uint8_t shutdown_comm_length;
2822 uint8_t remainder_offset;
2823
2824 ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
2825 if (length<BGP_NOTIFICATION_SIZE)
2826 return;
2827
2828 bgp_notification_header = (const struct bgp_notification *)dat;
2829 bgpn_major = EXTRACT_U_1(bgp_notification_header->bgpn_major);
2830 bgpn_minor = EXTRACT_U_1(bgp_notification_header->bgpn_minor);
2831
2832 ND_PRINT((ndo, ", %s (%u)",
2833 tok2str(bgp_notify_major_values, "Unknown Error",
2834 bgpn_major),
2835 bgpn_major));
2836
2837 switch (bgpn_major) {
2838
2839 case BGP_NOTIFY_MAJOR_MSG:
2840 ND_PRINT((ndo, ", subcode %s (%u)",
2841 tok2str(bgp_notify_minor_msg_values, "Unknown",
2842 bgpn_minor),
2843 bgpn_minor));
2844 break;
2845 case BGP_NOTIFY_MAJOR_OPEN:
2846 ND_PRINT((ndo, ", subcode %s (%u)",
2847 tok2str(bgp_notify_minor_open_values, "Unknown",
2848 bgpn_minor),
2849 bgpn_minor));
2850 break;
2851 case BGP_NOTIFY_MAJOR_UPDATE:
2852 ND_PRINT((ndo, ", subcode %s (%u)",
2853 tok2str(bgp_notify_minor_update_values, "Unknown",
2854 bgpn_minor),
2855 bgpn_minor));
2856 break;
2857 case BGP_NOTIFY_MAJOR_FSM:
2858 ND_PRINT((ndo, " subcode %s (%u)",
2859 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2860 bgpn_minor),
2861 bgpn_minor));
2862 break;
2863 case BGP_NOTIFY_MAJOR_CAP:
2864 ND_PRINT((ndo, " subcode %s (%u)",
2865 tok2str(bgp_notify_minor_cap_values, "Unknown",
2866 bgpn_minor),
2867 bgpn_minor));
2868 break;
2869 case BGP_NOTIFY_MAJOR_CEASE:
2870 ND_PRINT((ndo, ", subcode %s (%u)",
2871 tok2str(bgp_notify_minor_cease_values, "Unknown",
2872 bgpn_minor),
2873 bgpn_minor));
2874
2875 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2876 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2877 */
2878 if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2879 tptr = dat + BGP_NOTIFICATION_SIZE;
2880 ND_TCHECK_7(tptr);
2881 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2882 tok2str(af_values, "Unknown", EXTRACT_BE_U_2(tptr)),
2883 EXTRACT_BE_U_2(tptr),
2884 tok2str(bgp_safi_values, "Unknown", EXTRACT_U_1((tptr + 2))),
2885 EXTRACT_U_1((tptr + 2)),
2886 EXTRACT_BE_U_4(tptr + 3)));
2887 }
2888 /*
2889 * draft-ietf-idr-shutdown describes a method to send a communication
2890 * intended for human consumption regarding the Administrative Shutdown
2891 */
2892 if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
2893 bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
2894 length >= BGP_NOTIFICATION_SIZE + 1) {
2895 tptr = dat + BGP_NOTIFICATION_SIZE;
2896 ND_TCHECK_1(tptr);
2897 shutdown_comm_length = EXTRACT_U_1(tptr);
2898 remainder_offset = 0;
2899 /* garbage, hexdump it all */
2900 if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN ||
2901 shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) {
2902 ND_PRINT((ndo, ", invalid Shutdown Communication length"));
2903 }
2904 else if (shutdown_comm_length == 0) {
2905 ND_PRINT((ndo, ", empty Shutdown Communication"));
2906 remainder_offset += 1;
2907 }
2908 /* a proper shutdown communication */
2909 else {
2910 ND_TCHECK_LEN(tptr + 1, shutdown_comm_length);
2911 ND_PRINT((ndo, ", Shutdown Communication (length: %u): \"", shutdown_comm_length));
2912 (void)fn_printn(ndo, tptr+1, shutdown_comm_length, NULL);
2913 ND_PRINT((ndo, "\""));
2914 remainder_offset += shutdown_comm_length + 1;
2915 }
2916 /* if there is trailing data, hexdump it */
2917 if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) {
2918 ND_PRINT((ndo, ", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE)));
2919 hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2920 }
2921 }
2922 break;
2923 default:
2924 break;
2925 }
2926
2927 return;
2928 trunc:
2929 ND_PRINT((ndo, "[|BGP]"));
2930 }
2931
2932 static void
2933 bgp_route_refresh_print(netdissect_options *ndo,
2934 const u_char *pptr, u_int len)
2935 {
2936 const struct bgp_route_refresh *bgp_route_refresh_header;
2937
2938 ND_TCHECK_LEN(pptr, BGP_ROUTE_REFRESH_SIZE);
2939
2940 /* some little sanity checking */
2941 if (len<BGP_ROUTE_REFRESH_SIZE)
2942 return;
2943
2944 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2945
2946 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)",
2947 tok2str(af_values,"Unknown",
2948 EXTRACT_BE_U_2(bgp_route_refresh_header->afi)),
2949 EXTRACT_BE_U_2(bgp_route_refresh_header->afi),
2950 tok2str(bgp_safi_values,"Unknown",
2951 EXTRACT_U_1(bgp_route_refresh_header->safi)),
2952 EXTRACT_U_1(bgp_route_refresh_header->safi)));
2953
2954 if (ndo->ndo_vflag > 1) {
2955 ND_TCHECK_LEN(pptr, len);
2956 print_unknown_data(ndo, pptr, "\n\t ", len);
2957 }
2958
2959 return;
2960 trunc:
2961 ND_PRINT((ndo, "[|BGP]"));
2962 }
2963
2964 static int
2965 bgp_pdu_print(netdissect_options *ndo,
2966 const u_char *dat, u_int length)
2967 {
2968 const struct bgp *bgp_header;
2969 uint8_t bgp_type;
2970
2971 ND_TCHECK_LEN(dat, BGP_SIZE);
2972 bgp_header = (const struct bgp *)dat;
2973 bgp_type = EXTRACT_U_1(bgp_header->bgp_type);
2974
2975 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2976 tok2str(bgp_msg_values, "Unknown", bgp_type),
2977 bgp_type,
2978 length));
2979
2980 switch (bgp_type) {
2981 case BGP_OPEN:
2982 bgp_open_print(ndo, dat, length);
2983 break;
2984 case BGP_UPDATE:
2985 bgp_update_print(ndo, dat, length);
2986 break;
2987 case BGP_NOTIFICATION:
2988 bgp_notification_print(ndo, dat, length);
2989 break;
2990 case BGP_KEEPALIVE:
2991 break;
2992 case BGP_ROUTE_REFRESH:
2993 bgp_route_refresh_print(ndo, dat, length);
2994 break;
2995 default:
2996 /* we have no decoder for the BGP message */
2997 ND_TCHECK_LEN(dat, length);
2998 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp_type));
2999 print_unknown_data(ndo, dat, "\n\t ", length);
3000 break;
3001 }
3002 return 1;
3003 trunc:
3004 ND_PRINT((ndo, "[|BGP]"));
3005 return 0;
3006 }
3007
3008 void
3009 bgp_print(netdissect_options *ndo,
3010 const u_char *dat, u_int length)
3011 {
3012 const u_char *p;
3013 const u_char *ep;
3014 const u_char *start;
3015 const u_char marker[] = {
3016 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3017 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3018 };
3019 const struct bgp *bgp_header;
3020 uint16_t hlen;
3021
3022 ep = dat + length;
3023 if (ndo->ndo_snapend < dat + length)
3024 ep = ndo->ndo_snapend;
3025
3026 ND_PRINT((ndo, ": BGP"));
3027
3028 if (ndo->ndo_vflag < 1) /* lets be less chatty */
3029 return;
3030
3031 p = dat;
3032 start = p;
3033 while (p < ep) {
3034 if (!ND_TTEST_1(p))
3035 break;
3036 if (EXTRACT_U_1(p) != 0xff) {
3037 p++;
3038 continue;
3039 }
3040
3041 if (!ND_TTEST_LEN(p, sizeof(marker)))
3042 break;
3043 if (memcmp(p, marker, sizeof(marker)) != 0) {
3044 p++;
3045 continue;
3046 }
3047
3048 /* found BGP header */
3049 ND_TCHECK_LEN(p, BGP_SIZE);
3050 bgp_header = (const struct bgp *)p;
3051
3052 if (start != p)
3053 ND_PRINT((ndo, " [|BGP]"));
3054
3055 hlen = EXTRACT_BE_U_2(bgp_header->bgp_len);
3056 if (hlen < BGP_SIZE) {
3057 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
3058 BGP_SIZE));
3059 break;
3060 }
3061
3062 if (ND_TTEST_LEN(p, hlen)) {
3063 if (!bgp_pdu_print(ndo, p, hlen))
3064 return;
3065 p += hlen;
3066 start = p;
3067 } else {
3068 ND_PRINT((ndo, "\n[|BGP %s]",
3069 tok2str(bgp_msg_values,
3070 "Unknown Message Type",
3071 EXTRACT_U_1(bgp_header->bgp_type))));
3072 break;
3073 }
3074 }
3075
3076 return;
3077
3078 trunc:
3079 ND_PRINT((ndo, " [|BGP]"));
3080 }
3081
3082 /*
3083 * Local Variables:
3084 * c-style: whitesmith
3085 * c-basic-offset: 4
3086 * End:
3087 */
[mirror] the TCPdump network dissector