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Clean up signed vs. unsigned, add initializations to squelch complaints.
[tcpdump] / print-bgp.c
1 /*
2 * Copyright (C) 1999 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * Extensively modified by Hannes Gredler (hannes@gredler.at) for more
30 * complete BGP support.
31 */
32
33 /* \summary: Border Gateway Protocol (BGP) printer */
34
35 /* specification: RFC 4771 */
36
37 #ifdef HAVE_CONFIG_H
38 #include "config.h"
39 #endif
40
41 #include <netdissect-stdinc.h>
42
43 #include <stdio.h>
44 #include <string.h>
45
46 #include "netdissect.h"
47 #include "addrtoname.h"
48 #include "extract.h"
49 #include "af.h"
50 #include "l2vpn.h"
51
52 struct bgp {
53 nd_byte bgp_marker[16];
54 nd_uint16_t bgp_len;
55 nd_uint8_t bgp_type;
56 };
57 #define BGP_SIZE 19 /* unaligned */
58
59 #define BGP_OPEN 1
60 #define BGP_UPDATE 2
61 #define BGP_NOTIFICATION 3
62 #define BGP_KEEPALIVE 4
63 #define BGP_ROUTE_REFRESH 5
64
65 static const struct tok bgp_msg_values[] = {
66 { BGP_OPEN, "Open"},
67 { BGP_UPDATE, "Update"},
68 { BGP_NOTIFICATION, "Notification"},
69 { BGP_KEEPALIVE, "Keepalive"},
70 { BGP_ROUTE_REFRESH, "Route Refresh"},
71 { 0, NULL}
72 };
73
74 struct bgp_open {
75 nd_byte bgpo_marker[16];
76 nd_uint16_t bgpo_len;
77 nd_uint8_t bgpo_type;
78 nd_uint8_t bgpo_version;
79 nd_uint16_t bgpo_myas;
80 nd_uint16_t bgpo_holdtime;
81 nd_uint32_t bgpo_id;
82 nd_uint8_t bgpo_optlen;
83 /* options should follow */
84 };
85 #define BGP_OPEN_SIZE 29 /* unaligned */
86
87 struct bgp_opt {
88 nd_uint8_t bgpopt_type;
89 nd_uint8_t bgpopt_len;
90 /* variable length */
91 };
92 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
93 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
94
95 struct bgp_notification {
96 nd_byte bgpn_marker[16];
97 nd_uint16_t bgpn_len;
98 nd_uint8_t bgpn_type;
99 nd_uint8_t bgpn_major;
100 nd_uint8_t bgpn_minor;
101 };
102 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
103
104 struct bgp_route_refresh {
105 nd_byte bgp_marker[16];
106 nd_uint16_t len;
107 nd_uint8_t type; /* No padding after this; afi is, in fact, not aligned */
108 nd_uint16_t afi;
109 nd_uint8_t res;
110 nd_uint8_t safi;
111 };
112 #define BGP_ROUTE_REFRESH_SIZE 23
113
114 #define bgp_attr_lenlen(flags, p) \
115 (((flags) & 0x10) ? 2U : 1U)
116 #define bgp_attr_len(flags, p) \
117 (((flags) & 0x10) ? EXTRACT_BE_U_2(p) : EXTRACT_U_1(p))
118
119 #define BGPTYPE_ORIGIN 1
120 #define BGPTYPE_AS_PATH 2
121 #define BGPTYPE_NEXT_HOP 3
122 #define BGPTYPE_MULTI_EXIT_DISC 4
123 #define BGPTYPE_LOCAL_PREF 5
124 #define BGPTYPE_ATOMIC_AGGREGATE 6
125 #define BGPTYPE_AGGREGATOR 7
126 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
127 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */
128 #define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */
129 #define BGPTYPE_DPA 11 /* deprecated, draft-ietf-idr-bgp-dpa */
130 #define BGPTYPE_ADVERTISERS 12 /* deprecated RFC1863 */
131 #define BGPTYPE_RCID_PATH 13 /* deprecated RFC1863 */
132 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */
133 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */
134 #define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */
135 #define BGPTYPE_AS4_PATH 17 /* RFC6793 */
136 #define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */
137 #define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */
138 #define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */
139 #define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */
140 #define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */
141 #define BGPTYPE_AIGP 26 /* RFC7311 */
142 #define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */
143 #define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */
144 #define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */
145 #define BGPTYPE_ATTR_SET 128 /* RFC6368 */
146
147 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
148
149 static const struct tok bgp_attr_values[] = {
150 { BGPTYPE_ORIGIN, "Origin"},
151 { BGPTYPE_AS_PATH, "AS Path"},
152 { BGPTYPE_AS4_PATH, "AS4 Path"},
153 { BGPTYPE_NEXT_HOP, "Next Hop"},
154 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
155 { BGPTYPE_LOCAL_PREF, "Local Preference"},
156 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
157 { BGPTYPE_AGGREGATOR, "Aggregator"},
158 { BGPTYPE_AGGREGATOR4, "Aggregator4"},
159 { BGPTYPE_COMMUNITIES, "Community"},
160 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
161 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
162 { BGPTYPE_DPA, "DPA"},
163 { BGPTYPE_ADVERTISERS, "Advertisers"},
164 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"},
165 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
166 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
167 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
168 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
169 { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"},
170 { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"},
171 { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
172 { BGPTYPE_AIGP, "Accumulated IGP Metric"},
173 { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
174 { BGPTYPE_ENTROPY_LABEL, "Entropy Label"},
175 { BGPTYPE_LARGE_COMMUNITY, "Large Community"},
176 { BGPTYPE_ATTR_SET, "Attribute Set"},
177 { 255, "Reserved for development"},
178 { 0, NULL}
179 };
180
181 #define BGP_AS_SET 1
182 #define BGP_AS_SEQUENCE 2
183 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
184 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
185
186 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
187 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
188
189 static const struct tok bgp_as_path_segment_open_values[] = {
190 { BGP_AS_SEQUENCE, ""},
191 { BGP_AS_SET, "{ "},
192 { BGP_CONFED_AS_SEQUENCE, "( "},
193 { BGP_CONFED_AS_SET, "({ "},
194 { 0, NULL}
195 };
196
197 static const struct tok bgp_as_path_segment_close_values[] = {
198 { BGP_AS_SEQUENCE, ""},
199 { BGP_AS_SET, "}"},
200 { BGP_CONFED_AS_SEQUENCE, ")"},
201 { BGP_CONFED_AS_SET, "})"},
202 { 0, NULL}
203 };
204
205 #define BGP_OPT_AUTH 1
206 #define BGP_OPT_CAP 2
207
208 static const struct tok bgp_opt_values[] = {
209 { BGP_OPT_AUTH, "Authentication Information"},
210 { BGP_OPT_CAP, "Capabilities Advertisement"},
211 { 0, NULL}
212 };
213
214 #define BGP_CAPCODE_MP 1 /* RFC2858 */
215 #define BGP_CAPCODE_RR 2 /* RFC2918 */
216 #define BGP_CAPCODE_ORF 3 /* RFC5291 */
217 #define BGP_CAPCODE_MR 4 /* RFC3107 */
218 #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */
219 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */
220 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
221 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
222 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
223 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
224 #define BGP_CAPCODE_ENH_RR 70 /* draft-keyur-bgp-enhanced-route-refresh */
225 #define BGP_CAPCODE_RR_CISCO 128
226
227 static const struct tok bgp_capcode_values[] = {
228 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
229 { BGP_CAPCODE_RR, "Route Refresh"},
230 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
231 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
232 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
233 { BGP_CAPCODE_RESTART, "Graceful Restart"},
234 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
235 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
236 { BGP_CAPCODE_MULTISESS, "Multisession BGP"},
237 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
238 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
239 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
240 { 0, NULL}
241 };
242
243 #define BGP_NOTIFY_MAJOR_MSG 1
244 #define BGP_NOTIFY_MAJOR_OPEN 2
245 #define BGP_NOTIFY_MAJOR_UPDATE 3
246 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
247 #define BGP_NOTIFY_MAJOR_FSM 5
248 #define BGP_NOTIFY_MAJOR_CEASE 6
249 #define BGP_NOTIFY_MAJOR_CAP 7
250
251 static const struct tok bgp_notify_major_values[] = {
252 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
253 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
254 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
255 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
256 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
257 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
258 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"},
259 { 0, NULL}
260 };
261
262 /* draft-ietf-idr-cease-subcode-02 */
263 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
264 /* draft-ietf-idr-shutdown-07 */
265 #define BGP_NOTIFY_MINOR_CEASE_SHUT 2
266 #define BGP_NOTIFY_MINOR_CEASE_RESET 4
267 #define BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN 128
268 static const struct tok bgp_notify_minor_cease_values[] = {
269 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
270 { BGP_NOTIFY_MINOR_CEASE_SHUT, "Administrative Shutdown"},
271 { 3, "Peer Unconfigured"},
272 { BGP_NOTIFY_MINOR_CEASE_RESET, "Administrative Reset"},
273 { 5, "Connection Rejected"},
274 { 6, "Other Configuration Change"},
275 { 7, "Connection Collision Resolution"},
276 { 0, NULL}
277 };
278
279 static const struct tok bgp_notify_minor_msg_values[] = {
280 { 1, "Connection Not Synchronized"},
281 { 2, "Bad Message Length"},
282 { 3, "Bad Message Type"},
283 { 0, NULL}
284 };
285
286 static const struct tok bgp_notify_minor_open_values[] = {
287 { 1, "Unsupported Version Number"},
288 { 2, "Bad Peer AS"},
289 { 3, "Bad BGP Identifier"},
290 { 4, "Unsupported Optional Parameter"},
291 { 5, "Authentication Failure"},
292 { 6, "Unacceptable Hold Time"},
293 { 7, "Capability Message Error"},
294 { 0, NULL}
295 };
296
297 static const struct tok bgp_notify_minor_update_values[] = {
298 { 1, "Malformed Attribute List"},
299 { 2, "Unrecognized Well-known Attribute"},
300 { 3, "Missing Well-known Attribute"},
301 { 4, "Attribute Flags Error"},
302 { 5, "Attribute Length Error"},
303 { 6, "Invalid ORIGIN Attribute"},
304 { 7, "AS Routing Loop"},
305 { 8, "Invalid NEXT_HOP Attribute"},
306 { 9, "Optional Attribute Error"},
307 { 10, "Invalid Network Field"},
308 { 11, "Malformed AS_PATH"},
309 { 0, NULL}
310 };
311
312 static const struct tok bgp_notify_minor_fsm_values[] = {
313 { 0, "Unspecified Error"},
314 { 1, "In OpenSent State"},
315 { 2, "In OpenConfirm State"},
316 { 3, "In Established State"},
317 { 0, NULL }
318 };
319
320 static const struct tok bgp_notify_minor_cap_values[] = {
321 { 1, "Invalid Action Value" },
322 { 2, "Invalid Capability Length" },
323 { 3, "Malformed Capability Value" },
324 { 4, "Unsupported Capability Code" },
325 { 0, NULL }
326 };
327
328 static const struct tok bgp_origin_values[] = {
329 { 0, "IGP"},
330 { 1, "EGP"},
331 { 2, "Incomplete"},
332 { 0, NULL}
333 };
334
335 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1
336 #define BGP_PMSI_TUNNEL_LDP_P2MP 2
337 #define BGP_PMSI_TUNNEL_PIM_SSM 3
338 #define BGP_PMSI_TUNNEL_PIM_SM 4
339 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5
340 #define BGP_PMSI_TUNNEL_INGRESS 6
341 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7
342
343 static const struct tok bgp_pmsi_tunnel_values[] = {
344 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
345 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
346 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
347 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
348 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
349 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
350 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
351 { 0, NULL}
352 };
353
354 static const struct tok bgp_pmsi_flag_values[] = {
355 { 0x01, "Leaf Information required"},
356 { 0, NULL}
357 };
358
359 #define BGP_AIGP_TLV 1
360
361 static const struct tok bgp_aigp_values[] = {
362 { BGP_AIGP_TLV, "AIGP"},
363 { 0, NULL}
364 };
365
366 /* Subsequent address family identifier, RFC2283 section 7 */
367 #define SAFNUM_RES 0
368 #define SAFNUM_UNICAST 1
369 #define SAFNUM_MULTICAST 2
370 #define SAFNUM_UNIMULTICAST 3 /* deprecated now */
371 /* labeled BGP RFC3107 */
372 #define SAFNUM_LABUNICAST 4
373 /* RFC6514 */
374 #define SAFNUM_MULTICAST_VPN 5
375 /* draft-nalawade-kapoor-tunnel-safi */
376 #define SAFNUM_TUNNEL 64
377 /* RFC4761 */
378 #define SAFNUM_VPLS 65
379 /* RFC6037 */
380 #define SAFNUM_MDT 66
381 /* RFC4364 */
382 #define SAFNUM_VPNUNICAST 128
383 /* RFC6513 */
384 #define SAFNUM_VPNMULTICAST 129
385 #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */
386 /* RFC4684 */
387 #define SAFNUM_RT_ROUTING_INFO 132
388
389 #define BGP_VPN_RD_LEN 8
390
391 static const struct tok bgp_safi_values[] = {
392 { SAFNUM_RES, "Reserved"},
393 { SAFNUM_UNICAST, "Unicast"},
394 { SAFNUM_MULTICAST, "Multicast"},
395 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
396 { SAFNUM_LABUNICAST, "labeled Unicast"},
397 { SAFNUM_TUNNEL, "Tunnel"},
398 { SAFNUM_VPLS, "VPLS"},
399 { SAFNUM_MDT, "MDT"},
400 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
401 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
402 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
403 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
404 { SAFNUM_MULTICAST_VPN, "Multicast VPN"},
405 { 0, NULL }
406 };
407
408 /* well-known community */
409 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
410 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
411 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
412
413 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */
414 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
415 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
416 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
417 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
418 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
419 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
420 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
421 /* rfc2547 bgp-mpls-vpns */
422 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
423 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatibility */
424 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatibility */
425 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatibility */
426
427 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
428 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatibility */
429
430 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
431 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatibility */
432
433 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
434
435 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
436 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
437 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
438 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */
439
440 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */
441 #define BGP_EXT_COM_EIGRP_GEN 0x8800
442 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801
443 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
444 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803
445 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804
446 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
447
448 static const struct tok bgp_extd_comm_flag_values[] = {
449 { 0x8000, "vendor-specific"},
450 { 0x4000, "non-transitive"},
451 { 0, NULL},
452 };
453
454 static const struct tok bgp_extd_comm_subtype_values[] = {
455 { BGP_EXT_COM_RT_0, "target"},
456 { BGP_EXT_COM_RT_1, "target"},
457 { BGP_EXT_COM_RT_2, "target"},
458 { BGP_EXT_COM_RO_0, "origin"},
459 { BGP_EXT_COM_RO_1, "origin"},
460 { BGP_EXT_COM_RO_2, "origin"},
461 { BGP_EXT_COM_LINKBAND, "link-BW"},
462 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
463 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
464 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
465 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
466 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
467 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
468 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
469 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
470 { BGP_EXT_COM_L2INFO, "layer2-info"},
471 { BGP_EXT_COM_EIGRP_GEN , "eigrp-general-route (flag, tag)" },
472 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY , "eigrp-route-metric (AS, delay)" },
473 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW , "eigrp-route-metric (reliability, nexthop, bandwidth)" },
474 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU , "eigrp-route-metric (load, MTU)" },
475 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID , "eigrp-external-route (remote-AS, remote-ID)" },
476 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC , "eigrp-external-route (remote-proto, remote-metric)" },
477 { BGP_EXT_COM_SOURCE_AS, "source-AS" },
478 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
479 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
480 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
481 { 0, NULL},
482 };
483
484 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
485 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
486 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
487 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
488 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
489 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
490 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
491 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
492
493 static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
494 { BGP_OSPF_RTYPE_RTR, "Router" },
495 { BGP_OSPF_RTYPE_NET, "Network" },
496 { BGP_OSPF_RTYPE_SUM, "Summary" },
497 { BGP_OSPF_RTYPE_EXT, "External" },
498 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
499 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
500 { 0, NULL },
501 };
502
503 /* ADD-PATH Send/Receive field values */
504 static const struct tok bgp_add_path_recvsend[] = {
505 { 1, "Receive" },
506 { 2, "Send" },
507 { 3, "Both" },
508 { 0, NULL },
509 };
510
511 static char astostr[20];
512
513 /*
514 * as_printf
515 *
516 * Convert an AS number into a string and return string pointer.
517 *
518 * Depending on bflag is set or not, AS number is converted into ASDOT notation
519 * or plain number notation.
520 *
521 */
522 static char *
523 as_printf(netdissect_options *ndo,
524 char *str, size_t size, u_int asnum)
525 {
526 if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
527 snprintf(str, size, "%u", asnum);
528 } else {
529 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
530 }
531 return str;
532 }
533
534 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
535
536 int
537 decode_prefix4(netdissect_options *ndo,
538 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
539 {
540 struct in_addr addr;
541 u_int plen, plenbytes;
542
543 ND_TCHECK_1(pptr);
544 ITEMCHECK(1);
545 plen = EXTRACT_U_1(pptr);
546 if (32 < plen)
547 return -1;
548 itemlen -= 1;
549
550 memset(&addr, 0, sizeof(addr));
551 plenbytes = (plen + 7) / 8;
552 ND_TCHECK_LEN(pptr + 1, plenbytes);
553 ITEMCHECK(plenbytes);
554 memcpy(&addr, pptr + 1, plenbytes);
555 if (plen % 8) {
556 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
557 }
558 snprintf(buf, buflen, "%s/%u", ipaddr_string(ndo, &addr), plen);
559 return 1 + plenbytes;
560
561 trunc:
562 return -2;
563
564 badtlv:
565 return -3;
566 }
567
568 static int
569 decode_labeled_prefix4(netdissect_options *ndo,
570 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
571 {
572 struct in_addr addr;
573 u_int plen, plenbytes;
574
575 /* prefix length and label = 4 bytes */
576 ND_TCHECK_4(pptr);
577 ITEMCHECK(4);
578 plen = EXTRACT_U_1(pptr); /* get prefix length */
579
580 /* this is one of the weirdnesses of rfc3107
581 the label length (actually the label + COS bits)
582 is added to the prefix length;
583 we also do only read out just one label -
584 there is no real application for advertisement of
585 stacked labels in a single BGP message
586 */
587
588 if (24 > plen)
589 return -1;
590
591 plen-=24; /* adjust prefixlen - labellength */
592
593 if (32 < plen)
594 return -1;
595 itemlen -= 4;
596
597 memset(&addr, 0, sizeof(addr));
598 plenbytes = (plen + 7) / 8;
599 ND_TCHECK_LEN(pptr + 4, plenbytes);
600 ITEMCHECK(plenbytes);
601 memcpy(&addr, pptr + 4, plenbytes);
602 if (plen % 8) {
603 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
604 }
605 /* the label may get offsetted by 4 bits so lets shift it right */
606 snprintf(buf, buflen, "%s/%u, label:%u %s",
607 ipaddr_string(ndo, &addr),
608 plen,
609 EXTRACT_BE_U_3(pptr + 1)>>4,
610 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
611
612 return 4 + plenbytes;
613
614 trunc:
615 return -2;
616
617 badtlv:
618 return -3;
619 }
620
621 /*
622 * bgp_vpn_ip_print
623 *
624 * print an ipv4 or ipv6 address into a buffer dependend on address length.
625 */
626 static char *
627 bgp_vpn_ip_print(netdissect_options *ndo,
628 const u_char *pptr, u_int addr_length)
629 {
630
631 /* worst case string is s fully formatted v6 address */
632 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
633 char *pos = addr;
634
635 switch(addr_length) {
636 case (sizeof(struct in_addr) << 3): /* 32 */
637 ND_TCHECK_LEN(pptr, sizeof(struct in_addr));
638 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
639 break;
640 case (sizeof(struct in6_addr) << 3): /* 128 */
641 ND_TCHECK_LEN(pptr, sizeof(struct in6_addr));
642 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
643 break;
644 default:
645 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
646 break;
647 }
648 pos += strlen(pos);
649
650 trunc:
651 *(pos) = '\0';
652 return (addr);
653 }
654
655 /*
656 * bgp_vpn_sg_print
657 *
658 * print an multicast s,g entry into a buffer.
659 * the s,g entry is encoded like this.
660 *
661 * +-----------------------------------+
662 * | Multicast Source Length (1 octet) |
663 * +-----------------------------------+
664 * | Multicast Source (Variable) |
665 * +-----------------------------------+
666 * | Multicast Group Length (1 octet) |
667 * +-----------------------------------+
668 * | Multicast Group (Variable) |
669 * +-----------------------------------+
670 *
671 * return the number of bytes read from the wire.
672 */
673 static u_int
674 bgp_vpn_sg_print(netdissect_options *ndo,
675 const u_char *pptr, char *buf, u_int buflen)
676 {
677 uint8_t addr_length;
678 u_int total_length, offset;
679
680 total_length = 0;
681
682 /* Source address length, encoded in bits */
683 ND_TCHECK_1(pptr);
684 addr_length = EXTRACT_U_1(pptr);
685 pptr++;
686
687 /* Source address */
688 ND_TCHECK_LEN(pptr, (addr_length >> 3));
689 total_length += (addr_length >> 3) + 1;
690 offset = strlen(buf);
691 if (addr_length) {
692 snprintf(buf + offset, buflen - offset, ", Source %s",
693 bgp_vpn_ip_print(ndo, pptr, addr_length));
694 pptr += (addr_length >> 3);
695 }
696
697 /* Group address length, encoded in bits */
698 ND_TCHECK_1(pptr);
699 addr_length = EXTRACT_U_1(pptr);
700 pptr++;
701
702 /* Group address */
703 ND_TCHECK_LEN(pptr, (addr_length >> 3));
704 total_length += (addr_length >> 3) + 1;
705 offset = strlen(buf);
706 if (addr_length) {
707 snprintf(buf + offset, buflen - offset, ", Group %s",
708 bgp_vpn_ip_print(ndo, pptr, addr_length));
709 pptr += (addr_length >> 3);
710 }
711
712 trunc:
713 return (total_length);
714 }
715
716 /* RDs and RTs share the same semantics
717 * we use bgp_vpn_rd_print for
718 * printing route targets inside a NLRI */
719 char *
720 bgp_vpn_rd_print(netdissect_options *ndo,
721 const u_char *pptr)
722 {
723 /* allocate space for the largest possible string */
724 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
725 char *pos = rd;
726
727 /* ok lets load the RD format */
728 switch (EXTRACT_BE_U_2(pptr)) {
729
730 /* 2-byte-AS:number fmt*/
731 case 0:
732 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
733 EXTRACT_BE_U_2(pptr + 2),
734 EXTRACT_BE_U_4(pptr + 4),
735 EXTRACT_U_1(pptr + 4), EXTRACT_U_1(pptr + 5),
736 EXTRACT_U_1(pptr + 6), EXTRACT_U_1(pptr + 7));
737 break;
738 /* IP-address:AS fmt*/
739
740 case 1:
741 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
742 EXTRACT_U_1(pptr + 2), EXTRACT_U_1(pptr + 3),
743 EXTRACT_U_1(pptr + 4), EXTRACT_U_1(pptr + 5),
744 EXTRACT_BE_U_2(pptr + 6));
745 break;
746
747 /* 4-byte-AS:number fmt*/
748 case 2:
749 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
750 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(pptr + 2)),
751 EXTRACT_BE_U_2(pptr + 6), EXTRACT_U_1(pptr + 2),
752 EXTRACT_U_1(pptr + 3), EXTRACT_U_1(pptr + 4),
753 EXTRACT_U_1(pptr + 5), EXTRACT_BE_U_2(pptr + 6));
754 break;
755 default:
756 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
757 break;
758 }
759 pos += strlen(pos);
760 *(pos) = '\0';
761 return (rd);
762 }
763
764 static int
765 decode_rt_routing_info(netdissect_options *ndo,
766 const u_char *pptr, char *buf, u_int buflen)
767 {
768 uint8_t route_target[8];
769 u_int plen;
770 char asbuf[sizeof(astostr)]; /* bgp_vpn_rd_print() overwrites astostr */
771
772 /* NLRI "prefix length" from RFC 2858 Section 4. */
773 ND_TCHECK_1(pptr);
774 plen = EXTRACT_U_1(pptr); /* get prefix length */
775
776 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
777 * RFC 4684 Section 4 defines the layout of "origin AS" and "route
778 * target" fields inside the "prefix" depending on its length.
779 */
780 if (0 == plen) {
781 /* Without "origin AS", without "route target". */
782 snprintf(buf, buflen, "default route target");
783 return 1;
784 }
785
786 if (32 > plen)
787 return -1;
788
789 /* With at least "origin AS", possibly with "route target". */
790 ND_TCHECK_4(pptr + 1);
791 as_printf(ndo, asbuf, sizeof(asbuf), EXTRACT_BE_U_4(pptr + 1));
792
793 plen -= 32; /* adjust prefix length */
794
795 if (64 < plen)
796 return -1;
797
798 /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 }
799 * and gives the number of octets in the variable-length "route
800 * target" field inside this NLRI "prefix". Look for it.
801 */
802 memset(&route_target, 0, sizeof(route_target));
803 ND_TCHECK_LEN(pptr + 5, (plen + 7) / 8);
804 memcpy(&route_target, pptr + 5, (plen + 7) / 8);
805 /* Which specification says to do this? */
806 if (plen % 8) {
807 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
808 ((0xff00 >> (plen % 8)) & 0xff);
809 }
810 snprintf(buf, buflen, "origin AS: %s, route target %s",
811 asbuf,
812 bgp_vpn_rd_print(ndo, (u_char *)&route_target));
813
814 return 5 + (plen + 7) / 8;
815
816 trunc:
817 return -2;
818 }
819
820 static int
821 decode_labeled_vpn_prefix4(netdissect_options *ndo,
822 const u_char *pptr, char *buf, u_int buflen)
823 {
824 struct in_addr addr;
825 u_int plen;
826
827 ND_TCHECK_1(pptr);
828 plen = EXTRACT_U_1(pptr); /* get prefix length */
829
830 if ((24+64) > plen)
831 return -1;
832
833 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
834
835 if (32 < plen)
836 return -1;
837
838 memset(&addr, 0, sizeof(addr));
839 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
840 memcpy(&addr, pptr + 12, (plen + 7) / 8);
841 if (plen % 8) {
842 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
843 ((0xff00 >> (plen % 8)) & 0xff);
844 }
845 /* the label may get offsetted by 4 bits so lets shift it right */
846 snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
847 bgp_vpn_rd_print(ndo, pptr+4),
848 ipaddr_string(ndo, &addr),
849 plen,
850 EXTRACT_BE_U_3(pptr + 1)>>4,
851 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
852
853 return 12 + (plen + 7) / 8;
854
855 trunc:
856 return -2;
857 }
858
859 /*
860 * +-------------------------------+
861 * | |
862 * | RD:IPv4-address (12 octets) |
863 * | |
864 * +-------------------------------+
865 * | MDT Group-address (4 octets) |
866 * +-------------------------------+
867 */
868
869 #define MDT_VPN_NLRI_LEN 16
870
871 static int
872 decode_mdt_vpn_nlri(netdissect_options *ndo,
873 const u_char *pptr, char *buf, u_int buflen)
874 {
875 const u_char *rd;
876 const u_char *vpn_ip;
877
878 ND_TCHECK_1(pptr);
879
880 /* if the NLRI is not predefined length, quit.*/
881 if (EXTRACT_U_1(pptr) != MDT_VPN_NLRI_LEN * 8)
882 return -1;
883 pptr++;
884
885 /* RD */
886 ND_TCHECK_8(pptr);
887 rd = pptr;
888 pptr += 8;
889
890 /* IPv4 address */
891 ND_TCHECK_LEN(pptr, sizeof(struct in_addr));
892 vpn_ip = pptr;
893 pptr += sizeof(struct in_addr);
894
895 /* MDT Group Address */
896 ND_TCHECK_LEN(pptr, sizeof(struct in_addr));
897
898 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
899 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
900
901 return MDT_VPN_NLRI_LEN + 1;
902
903 trunc:
904 return -2;
905 }
906
907 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
908 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
909 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
910 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
911 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
912 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
913 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
914
915 static const struct tok bgp_multicast_vpn_route_type_values[] = {
916 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
917 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
918 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
919 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
920 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
921 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
922 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
923 { 0, NULL}
924 };
925
926 static int
927 decode_multicast_vpn(netdissect_options *ndo,
928 const u_char *pptr, char *buf, size_t buflen)
929 {
930 uint8_t route_type, route_length, addr_length;
931 u_int sg_length;
932 u_int offset;
933
934 ND_TCHECK_2(pptr);
935 route_type = EXTRACT_U_1(pptr);
936 pptr++;
937 route_length = EXTRACT_U_1(pptr);
938 pptr++;
939
940 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
941 tok2str(bgp_multicast_vpn_route_type_values,
942 "Unknown", route_type),
943 route_type, route_length);
944
945 switch(route_type) {
946 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
947 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
948 offset = strlen(buf);
949 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
950 bgp_vpn_rd_print(ndo, pptr),
951 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
952 (route_length - BGP_VPN_RD_LEN) << 3));
953 break;
954 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
955 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
956 offset = strlen(buf);
957 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
958 bgp_vpn_rd_print(ndo, pptr),
959 as_printf(ndo, astostr, sizeof(astostr),
960 EXTRACT_BE_U_4(pptr + BGP_VPN_RD_LEN)));
961 break;
962
963 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
964 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
965 offset = strlen(buf);
966 snprintf(buf + offset, buflen - offset, ", RD: %s",
967 bgp_vpn_rd_print(ndo, pptr));
968 pptr += BGP_VPN_RD_LEN;
969
970 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
971 addr_length = route_length - sg_length;
972
973 ND_TCHECK_LEN(pptr, addr_length);
974 offset = strlen(buf);
975 snprintf(buf + offset, buflen - offset, ", Originator %s",
976 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
977 break;
978
979 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
980 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
981 offset = strlen(buf);
982 snprintf(buf + offset, buflen - offset, ", RD: %s",
983 bgp_vpn_rd_print(ndo, pptr));
984 pptr += BGP_VPN_RD_LEN;
985
986 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
987 break;
988
989 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
990 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
991 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
992 offset = strlen(buf);
993 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
994 bgp_vpn_rd_print(ndo, pptr),
995 as_printf(ndo, astostr, sizeof(astostr),
996 EXTRACT_BE_U_4(pptr + BGP_VPN_RD_LEN)));
997 pptr += BGP_VPN_RD_LEN + 4;
998
999 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1000 break;
1001
1002 /*
1003 * no per route-type printing yet.
1004 */
1005 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
1006 default:
1007 break;
1008 }
1009
1010 return route_length + 2;
1011
1012 trunc:
1013 return -2;
1014 }
1015
1016 /*
1017 * As I remember, some versions of systems have an snprintf() that
1018 * returns -1 if the buffer would have overflowed. If the return
1019 * value is negative, set buflen to 0, to indicate that we've filled
1020 * the buffer up.
1021 *
1022 * If the return value is greater than buflen, that means that
1023 * the buffer would have overflowed; again, set buflen to 0 in
1024 * that case.
1025 */
1026 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1027 if (stringlen<0) \
1028 buflen=0; \
1029 else if ((u_int)stringlen>buflen) \
1030 buflen=0; \
1031 else { \
1032 buflen-=stringlen; \
1033 buf+=stringlen; \
1034 }
1035
1036 static int
1037 decode_labeled_vpn_l2(netdissect_options *ndo,
1038 const u_char *pptr, char *buf, u_int buflen)
1039 {
1040 u_int plen, tlen, tlv_type, tlv_len, ttlv_len;
1041 int stringlen;
1042
1043 ND_TCHECK_2(pptr);
1044 plen = EXTRACT_BE_U_2(pptr);
1045 tlen = plen;
1046 pptr += 2;
1047 /* Old and new L2VPN NLRI share AFI/SAFI
1048 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1049 * and > 17 as old format. Complain for the middle case
1050 */
1051 if (plen == 12) {
1052 /* assume AD-only with RD, BGPNH */
1053 ND_TCHECK_LEN(pptr, 12);
1054 buf[0] = '\0';
1055 stringlen = snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1056 bgp_vpn_rd_print(ndo, pptr),
1057 ipaddr_string(ndo, pptr+8));
1058 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1059 pptr += 12;
1060 tlen -= 12;
1061 return plen;
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 != 00) {
1079 if (tlen < 3)
1080 return -1;
1081 ND_TCHECK_3(pptr);
1082 tlv_type = EXTRACT_U_1(pptr);
1083 pptr++;
1084 tlv_len = EXTRACT_BE_U_2(pptr);
1085 ttlv_len = tlv_len;
1086 pptr += 2;
1087
1088 switch(tlv_type) {
1089 case 1:
1090 if (buflen != 0) {
1091 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1092 tlv_type,
1093 tlv_len);
1094 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1095 }
1096 ttlv_len = ttlv_len/8+1; /* how many bytes do we need to read ? */
1097 while (ttlv_len > 0) {
1098 ND_TCHECK_1(pptr);
1099 if (buflen != 0) {
1100 stringlen=snprintf(buf,buflen, "%02x",
1101 EXTRACT_U_1(pptr));
1102 pptr++;
1103 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1104 }
1105 ttlv_len--;
1106 }
1107 break;
1108 default:
1109 if (buflen != 0) {
1110 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1111 tlv_type,
1112 tlv_len);
1113 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1114 }
1115 break;
1116 }
1117 tlen -= (tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
1118 }
1119 return plen + 2;
1120 } else {
1121 /* complain bitterly ? */
1122 /* fall through */
1123 goto trunc;
1124 }
1125
1126 trunc:
1127 return -2;
1128 }
1129
1130 int
1131 decode_prefix6(netdissect_options *ndo,
1132 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1133 {
1134 struct in6_addr addr;
1135 u_int plen, plenbytes;
1136
1137 ND_TCHECK_1(pd);
1138 ITEMCHECK(1);
1139 plen = EXTRACT_U_1(pd);
1140 if (128 < plen)
1141 return -1;
1142 itemlen -= 1;
1143
1144 memset(&addr, 0, sizeof(addr));
1145 plenbytes = (plen + 7) / 8;
1146 ND_TCHECK_LEN(pd + 1, plenbytes);
1147 ITEMCHECK(plenbytes);
1148 memcpy(&addr, pd + 1, plenbytes);
1149 if (plen % 8) {
1150 addr.s6_addr[plenbytes - 1] &=
1151 ((0xff00 >> (plen % 8)) & 0xff);
1152 }
1153 snprintf(buf, buflen, "%s/%u", ip6addr_string(ndo, &addr), plen);
1154 return 1 + plenbytes;
1155
1156 trunc:
1157 return -2;
1158
1159 badtlv:
1160 return -3;
1161 }
1162
1163 static int
1164 decode_labeled_prefix6(netdissect_options *ndo,
1165 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1166 {
1167 struct in6_addr addr;
1168 u_int plen, plenbytes;
1169
1170 /* prefix length and label = 4 bytes */
1171 ND_TCHECK_4(pptr);
1172 ITEMCHECK(4);
1173 plen = EXTRACT_U_1(pptr); /* get prefix length */
1174
1175 if (24 > plen)
1176 return -1;
1177
1178 plen -= 24; /* adjust prefixlen - labellength */
1179
1180 if (128 < plen)
1181 return -1;
1182 itemlen -= 4;
1183
1184 memset(&addr, 0, sizeof(addr));
1185 plenbytes = (plen + 7) / 8;
1186 ND_TCHECK_LEN(pptr + 4, plenbytes);
1187 memcpy(&addr, pptr + 4, plenbytes);
1188 if (plen % 8) {
1189 addr.s6_addr[plenbytes - 1] &=
1190 ((0xff00 >> (plen % 8)) & 0xff);
1191 }
1192 /* the label may get offsetted by 4 bits so lets shift it right */
1193 snprintf(buf, buflen, "%s/%u, label:%u %s",
1194 ip6addr_string(ndo, &addr),
1195 plen,
1196 EXTRACT_BE_U_3(pptr + 1)>>4,
1197 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1198
1199 return 4 + plenbytes;
1200
1201 trunc:
1202 return -2;
1203
1204 badtlv:
1205 return -3;
1206 }
1207
1208 static int
1209 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1210 const u_char *pptr, char *buf, u_int buflen)
1211 {
1212 struct in6_addr addr;
1213 u_int plen;
1214
1215 ND_TCHECK_1(pptr);
1216 plen = EXTRACT_U_1(pptr); /* get prefix length */
1217
1218 if ((24+64) > plen)
1219 return -1;
1220
1221 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1222
1223 if (128 < plen)
1224 return -1;
1225
1226 memset(&addr, 0, sizeof(addr));
1227 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1228 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1229 if (plen % 8) {
1230 addr.s6_addr[(plen + 7) / 8 - 1] &=
1231 ((0xff00 >> (plen % 8)) & 0xff);
1232 }
1233 /* the label may get offsetted by 4 bits so lets shift it right */
1234 snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1235 bgp_vpn_rd_print(ndo, pptr+4),
1236 ip6addr_string(ndo, &addr),
1237 plen,
1238 EXTRACT_BE_U_3(pptr + 1)>>4,
1239 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1240
1241 return 12 + (plen + 7) / 8;
1242
1243 trunc:
1244 return -2;
1245 }
1246
1247 static int
1248 decode_clnp_prefix(netdissect_options *ndo,
1249 const u_char *pptr, char *buf, u_int buflen)
1250 {
1251 uint8_t addr[19];
1252 u_int plen;
1253
1254 ND_TCHECK_1(pptr);
1255 plen = EXTRACT_U_1(pptr); /* get prefix length */
1256
1257 if (152 < plen)
1258 return -1;
1259
1260 memset(&addr, 0, sizeof(addr));
1261 ND_TCHECK_LEN(pptr + 4, (plen + 7) / 8);
1262 memcpy(&addr, pptr + 4, (plen + 7) / 8);
1263 if (plen % 8) {
1264 addr[(plen + 7) / 8 - 1] &=
1265 ((0xff00 >> (plen % 8)) & 0xff);
1266 }
1267 snprintf(buf, buflen, "%s/%u",
1268 isonsap_string(ndo, addr,(plen + 7) / 8),
1269 plen);
1270
1271 return 1 + (plen + 7) / 8;
1272
1273 trunc:
1274 return -2;
1275 }
1276
1277 static int
1278 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1279 const u_char *pptr, char *buf, u_int buflen)
1280 {
1281 uint8_t addr[19];
1282 u_int plen;
1283
1284 ND_TCHECK_1(pptr);
1285 plen = EXTRACT_U_1(pptr); /* get prefix length */
1286
1287 if ((24+64) > plen)
1288 return -1;
1289
1290 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1291
1292 if (152 < plen)
1293 return -1;
1294
1295 memset(&addr, 0, sizeof(addr));
1296 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1297 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1298 if (plen % 8) {
1299 addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
1300 }
1301 /* the label may get offsetted by 4 bits so lets shift it right */
1302 snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1303 bgp_vpn_rd_print(ndo, pptr+4),
1304 isonsap_string(ndo, addr,(plen + 7) / 8),
1305 plen,
1306 EXTRACT_BE_U_3(pptr + 1)>>4,
1307 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1308
1309 return 12 + (plen + 7) / 8;
1310
1311 trunc:
1312 return -2;
1313 }
1314
1315 /*
1316 * bgp_attr_get_as_size
1317 *
1318 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1319 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1320 * support, exchange AS-Path with the same path-attribute type value 0x02.
1321 */
1322 static u_int
1323 bgp_attr_get_as_size(netdissect_options *ndo,
1324 uint8_t bgpa_type, const u_char *pptr, u_int len)
1325 {
1326 const u_char *tptr = pptr;
1327
1328 /*
1329 * If the path attribute is the optional AS4 path type, then we already
1330 * know, that ASs must be encoded in 4 byte format.
1331 */
1332 if (bgpa_type == BGPTYPE_AS4_PATH) {
1333 return 4;
1334 }
1335
1336 /*
1337 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1338 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1339 * each.
1340 */
1341 while (tptr < pptr + len) {
1342 ND_TCHECK_1(tptr);
1343
1344 /*
1345 * If we do not find a valid segment type, our guess might be wrong.
1346 */
1347 if (EXTRACT_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || EXTRACT_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
1348 goto trunc;
1349 }
1350 ND_TCHECK_1(tptr + 1);
1351 tptr += 2 + EXTRACT_U_1(tptr + 1) * 2;
1352 }
1353
1354 /*
1355 * If we correctly reached end of the AS path attribute data content,
1356 * then most likely ASs were indeed encoded as 2 bytes.
1357 */
1358 if (tptr == pptr + len) {
1359 return 2;
1360 }
1361
1362 trunc:
1363
1364 /*
1365 * We can come here, either we did not have enough data, or if we
1366 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1367 * so that calller can try to decode each AS as of 4 bytes. If indeed
1368 * there was not enough data, it will crib and end the parse anyways.
1369 */
1370 return 4;
1371 }
1372
1373 /*
1374 * The only way to know that a BGP UPDATE message is using add path is
1375 * by checking if the capability is in the OPEN message which we may have missed.
1376 * So this function checks if it is possible that the update could contain add path
1377 * and if so it checks that standard BGP doesn't make sense.
1378 */
1379 static int
1380 check_add_path(const u_char *pptr, u_int length, u_int max_prefix_length)
1381 {
1382 u_int offset, prefix_length;
1383
1384 if (length < 5) {
1385 return 0;
1386 }
1387
1388 /* check if it could be add path */
1389 for (offset = 0; offset < length;) {
1390 offset += 4;
1391 prefix_length = EXTRACT_U_1(pptr + offset);
1392 /*
1393 * Add 4 to cover the path id
1394 * and check the prefix length isn't greater than 32/128.
1395 */
1396 if (prefix_length > max_prefix_length) {
1397 return 0;
1398 }
1399 /* Add 1 for the prefix_length byte and prefix_length to cover the address */
1400 offset += 1 + ((prefix_length + 7) / 8);
1401 }
1402 /* check we haven't gone past the end of the section */
1403 if (offset > length) {
1404 return 0;
1405 }
1406
1407 /* check it's not standard BGP */
1408 for (offset = 0; offset < length; ) {
1409 prefix_length = EXTRACT_U_1(pptr + offset);
1410 /*
1411 * If the prefix_length is zero (0.0.0.0/0)
1412 * and since it's not the only address (length >= 5)
1413 * then it is add-path
1414 */
1415 if (prefix_length < 1 || prefix_length > max_prefix_length) {
1416 return 1;
1417 }
1418 offset += 1 + ((prefix_length + 7) / 8);
1419 }
1420 if (offset > length) {
1421 return 1;
1422 }
1423
1424 /* assume not add-path by default */
1425 return 0;
1426 }
1427
1428 static int
1429 bgp_attr_print(netdissect_options *ndo,
1430 u_int atype, const u_char *pptr, u_int len)
1431 {
1432 u_int i;
1433 uint16_t af;
1434 uint8_t safi, snpa, nhlen;
1435 union { /* copy buffer for bandwidth values */
1436 float f;
1437 uint32_t i;
1438 } bw;
1439 int advance;
1440 u_int tlen;
1441 const u_char *tptr;
1442 char buf[MAXHOSTNAMELEN + 100];
1443 u_int as_size;
1444 int add_path4, add_path6;
1445 u_int path_id = 0;
1446
1447 tptr = pptr;
1448 tlen = len;
1449
1450 switch (atype) {
1451 case BGPTYPE_ORIGIN:
1452 if (len != 1)
1453 ND_PRINT((ndo, "invalid len"));
1454 else {
1455 ND_TCHECK_1(tptr);
1456 ND_PRINT((ndo, "%s", tok2str(bgp_origin_values,
1457 "Unknown Origin Typecode",
1458 EXTRACT_U_1(tptr))));
1459 }
1460 break;
1461
1462 /*
1463 * Process AS4 byte path and AS2 byte path attributes here.
1464 */
1465 case BGPTYPE_AS4_PATH:
1466 case BGPTYPE_AS_PATH:
1467 if (len % 2) {
1468 ND_PRINT((ndo, "invalid len"));
1469 break;
1470 }
1471 if (!len) {
1472 ND_PRINT((ndo, "empty"));
1473 break;
1474 }
1475
1476 /*
1477 * BGP updates exchanged between New speakers that support 4
1478 * byte AS, ASs are always encoded in 4 bytes. There is no
1479 * definitive way to find this, just by the packet's
1480 * contents. So, check for packet's TLV's sanity assuming
1481 * 2 bytes first, and it does not pass, assume that ASs are
1482 * encoded in 4 bytes format and move on.
1483 */
1484 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1485
1486 while (tptr < pptr + len) {
1487 ND_TCHECK_1(tptr);
1488 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values,
1489 "?", EXTRACT_U_1(tptr))));
1490 ND_TCHECK_1(tptr + 1);
1491 for (i = 0; i < EXTRACT_U_1(tptr + 1) * as_size; i += as_size) {
1492 ND_TCHECK_LEN(tptr + 2 + i, as_size);
1493 ND_PRINT((ndo, "%s ",
1494 as_printf(ndo, astostr, sizeof(astostr),
1495 as_size == 2 ?
1496 EXTRACT_BE_U_2(tptr + i + 2) :
1497 EXTRACT_BE_U_4(tptr + i + 2))));
1498 }
1499 ND_TCHECK_1(tptr);
1500 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values,
1501 "?", EXTRACT_U_1(tptr))));
1502 ND_TCHECK_1(tptr + 1);
1503 tptr += 2 + EXTRACT_U_1(tptr + 1) * as_size;
1504 }
1505 break;
1506 case BGPTYPE_NEXT_HOP:
1507 if (len != 4)
1508 ND_PRINT((ndo, "invalid len"));
1509 else {
1510 ND_TCHECK_4(tptr);
1511 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1512 }
1513 break;
1514 case BGPTYPE_MULTI_EXIT_DISC:
1515 case BGPTYPE_LOCAL_PREF:
1516 if (len != 4)
1517 ND_PRINT((ndo, "invalid len"));
1518 else {
1519 ND_TCHECK_4(tptr);
1520 ND_PRINT((ndo, "%u", EXTRACT_BE_U_4(tptr)));
1521 }
1522 break;
1523 case BGPTYPE_ATOMIC_AGGREGATE:
1524 if (len != 0)
1525 ND_PRINT((ndo, "invalid len"));
1526 break;
1527 case BGPTYPE_AGGREGATOR:
1528
1529 /*
1530 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1531 * the length of this PA can be either 6 bytes or 8 bytes.
1532 */
1533 if (len != 6 && len != 8) {
1534 ND_PRINT((ndo, "invalid len"));
1535 break;
1536 }
1537 ND_TCHECK_LEN(tptr, len);
1538 if (len == 6) {
1539 ND_PRINT((ndo, " AS #%s, origin %s",
1540 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(tptr)),
1541 ipaddr_string(ndo, tptr + 2)));
1542 } else {
1543 ND_PRINT((ndo, " AS #%s, origin %s",
1544 as_printf(ndo, astostr, sizeof(astostr),
1545 EXTRACT_BE_U_4(tptr)), ipaddr_string(ndo, tptr + 4)));
1546 }
1547 break;
1548 case BGPTYPE_AGGREGATOR4:
1549 if (len != 8) {
1550 ND_PRINT((ndo, "invalid len"));
1551 break;
1552 }
1553 ND_TCHECK_8(tptr);
1554 ND_PRINT((ndo, " AS #%s, origin %s",
1555 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr)),
1556 ipaddr_string(ndo, tptr + 4)));
1557 break;
1558 case BGPTYPE_COMMUNITIES:
1559 if (len % 4) {
1560 ND_PRINT((ndo, "invalid len"));
1561 break;
1562 }
1563 while (tlen>0) {
1564 uint32_t comm;
1565 ND_TCHECK_4(tptr);
1566 comm = EXTRACT_BE_U_4(tptr);
1567 switch (comm) {
1568 case BGP_COMMUNITY_NO_EXPORT:
1569 ND_PRINT((ndo, " NO_EXPORT"));
1570 break;
1571 case BGP_COMMUNITY_NO_ADVERT:
1572 ND_PRINT((ndo, " NO_ADVERTISE"));
1573 break;
1574 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1575 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1576 break;
1577 default:
1578 ND_PRINT((ndo, "%u:%u%s",
1579 (comm >> 16) & 0xffff,
1580 comm & 0xffff,
1581 (tlen>4) ? ", " : ""));
1582 break;
1583 }
1584 tlen -=4;
1585 tptr +=4;
1586 }
1587 break;
1588 case BGPTYPE_ORIGINATOR_ID:
1589 if (len != 4) {
1590 ND_PRINT((ndo, "invalid len"));
1591 break;
1592 }
1593 ND_TCHECK_4(tptr);
1594 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1595 break;
1596 case BGPTYPE_CLUSTER_LIST:
1597 if (len % 4) {
1598 ND_PRINT((ndo, "invalid len"));
1599 break;
1600 }
1601 while (tlen>0) {
1602 ND_TCHECK_4(tptr);
1603 ND_PRINT((ndo, "%s%s",
1604 ipaddr_string(ndo, tptr),
1605 (tlen>4) ? ", " : ""));
1606 tlen -=4;
1607 tptr +=4;
1608 }
1609 break;
1610 case BGPTYPE_MP_REACH_NLRI:
1611 ND_TCHECK_3(tptr);
1612 af = EXTRACT_BE_U_2(tptr);
1613 safi = EXTRACT_U_1(tptr + 2);
1614
1615 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1616 tok2str(af_values, "Unknown AFI", af),
1617 af,
1618 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1619 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1620 safi));
1621
1622 switch(af<<8 | safi) {
1623 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1624 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1625 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1626 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1627 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1628 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1629 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1630 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1631 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1632 case (AFNUM_INET<<8 | SAFNUM_MDT):
1633 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1634 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1635 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1636 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1637 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1638 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1639 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1640 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1641 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1642 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1643 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1644 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1645 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1646 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1647 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1648 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1649 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1650 break;
1651 default:
1652 ND_TCHECK_LEN(tptr, tlen);
1653 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1654 if (ndo->ndo_vflag <= 1)
1655 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1656 goto done;
1657 break;
1658 }
1659
1660 tptr +=3;
1661
1662 ND_TCHECK_1(tptr);
1663 nhlen = EXTRACT_U_1(tptr);
1664 tlen = nhlen;
1665 tptr++;
1666
1667 if (tlen) {
1668 u_int nnh = 0;
1669 ND_PRINT((ndo, "\n\t nexthop: "));
1670 while (tlen != 0) {
1671 if (nnh++ > 0) {
1672 ND_PRINT((ndo, ", " ));
1673 }
1674 switch(af<<8 | safi) {
1675 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1676 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1677 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1678 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1679 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1680 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1681 case (AFNUM_INET<<8 | SAFNUM_MDT):
1682 if (tlen < sizeof(struct in_addr)) {
1683 ND_PRINT((ndo, "invalid len"));
1684 tlen = 0;
1685 } else {
1686 ND_TCHECK_LEN(tptr, sizeof(struct in_addr));
1687 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1688 tlen -= sizeof(struct in_addr);
1689 tptr += sizeof(struct in_addr);
1690 }
1691 break;
1692 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1693 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1694 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1695 if (tlen < sizeof(struct in_addr)+BGP_VPN_RD_LEN) {
1696 ND_PRINT((ndo, "invalid len"));
1697 tlen = 0;
1698 } else {
1699 ND_TCHECK_LEN(tptr,
1700 sizeof(struct in_addr) + BGP_VPN_RD_LEN);
1701 ND_PRINT((ndo, "RD: %s, %s",
1702 bgp_vpn_rd_print(ndo, tptr),
1703 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1704 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1705 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1706 }
1707 break;
1708 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1709 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1710 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1711 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1712 if (tlen < sizeof(struct in6_addr)) {
1713 ND_PRINT((ndo, "invalid len"));
1714 tlen = 0;
1715 } else {
1716 ND_TCHECK_LEN(tptr, sizeof(struct in6_addr));
1717 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr)));
1718 tlen -= sizeof(struct in6_addr);
1719 tptr += sizeof(struct in6_addr);
1720 }
1721 break;
1722 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1723 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1724 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1725 if (tlen < sizeof(struct in6_addr)+BGP_VPN_RD_LEN) {
1726 ND_PRINT((ndo, "invalid len"));
1727 tlen = 0;
1728 } else {
1729 ND_TCHECK_LEN(tptr,
1730 sizeof(struct in6_addr) + BGP_VPN_RD_LEN);
1731 ND_PRINT((ndo, "RD: %s, %s",
1732 bgp_vpn_rd_print(ndo, tptr),
1733 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1734 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1735 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1736 }
1737 break;
1738 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1739 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1740 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1741 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1742 if (tlen < sizeof(struct in_addr)) {
1743 ND_PRINT((ndo, "invalid len"));
1744 tlen = 0;
1745 } else {
1746 ND_TCHECK_LEN(tptr, sizeof(struct in_addr));
1747 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1748 tlen -= (sizeof(struct in_addr));
1749 tptr += (sizeof(struct in_addr));
1750 }
1751 break;
1752 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1753 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1754 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1755 ND_TCHECK_LEN(tptr, tlen);
1756 ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen)));
1757 tptr += tlen;
1758 tlen = 0;
1759 break;
1760
1761 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1762 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1763 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1764 if (tlen < BGP_VPN_RD_LEN+1) {
1765 ND_PRINT((ndo, "invalid len"));
1766 tlen = 0;
1767 } else {
1768 ND_TCHECK_LEN(tptr, tlen);
1769 ND_PRINT((ndo, "RD: %s, %s",
1770 bgp_vpn_rd_print(ndo, tptr),
1771 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1772 /* rfc986 mapped IPv4 address ? */
1773 if (EXTRACT_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
1774 ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4)));
1775 /* rfc1888 mapped IPv6 address ? */
1776 else if (EXTRACT_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
1777 ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3)));
1778 tptr += tlen;
1779 tlen = 0;
1780 }
1781 break;
1782 default:
1783 ND_TCHECK_LEN(tptr, tlen);
1784 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1785 if (ndo->ndo_vflag <= 1)
1786 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1787 tptr += tlen;
1788 tlen = 0;
1789 goto done;
1790 break;
1791 }
1792 }
1793 }
1794 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1795 tptr += tlen;
1796
1797 ND_TCHECK_1(tptr);
1798 snpa = EXTRACT_U_1(tptr);
1799 tptr++;
1800
1801 if (snpa) {
1802 ND_PRINT((ndo, "\n\t %u SNPA", snpa));
1803 for (/*nothing*/; snpa > 0; snpa--) {
1804 ND_TCHECK_1(tptr);
1805 ND_PRINT((ndo, "\n\t %u bytes", EXTRACT_U_1(tptr)));
1806 tptr += EXTRACT_U_1(tptr) + 1;
1807 }
1808 } else {
1809 ND_PRINT((ndo, ", no SNPA"));
1810 }
1811
1812 add_path4 = check_add_path(tptr, (len-(tptr - pptr)), 32);
1813 add_path6 = check_add_path(tptr, (len-(tptr - pptr)), 128);
1814
1815 while (tptr < pptr + len) {
1816 switch (af<<8 | safi) {
1817 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1818 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1819 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1820 if (add_path4) {
1821 path_id = EXTRACT_BE_U_4(tptr);
1822 tptr += 4;
1823 }
1824 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1825 if (advance == -1)
1826 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1827 else if (advance == -2)
1828 goto trunc;
1829 else if (advance == -3)
1830 break; /* bytes left, but not enough */
1831 else
1832 ND_PRINT((ndo, "\n\t %s", buf));
1833 if (add_path4) {
1834 ND_PRINT((ndo, " Path Id: %u", path_id));
1835 }
1836 break;
1837 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1838 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1839 if (advance == -1)
1840 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1841 else if (advance == -2)
1842 goto trunc;
1843 else if (advance == -3)
1844 break; /* bytes left, but not enough */
1845 else
1846 ND_PRINT((ndo, "\n\t %s", buf));
1847 break;
1848 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1849 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1850 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1851 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1852 if (advance == -1)
1853 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1854 else if (advance == -2)
1855 goto trunc;
1856 else
1857 ND_PRINT((ndo, "\n\t %s", buf));
1858 break;
1859 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1860 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf));
1861 if (advance == -1)
1862 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1863 else if (advance == -2)
1864 goto trunc;
1865 else
1866 ND_PRINT((ndo, "\n\t %s", buf));
1867 break;
1868 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1869 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1870 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1871 if (advance == -1)
1872 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1873 else if (advance == -2)
1874 goto trunc;
1875 else
1876 ND_PRINT((ndo, "\n\t %s", buf));
1877 break;
1878
1879 case (AFNUM_INET<<8 | SAFNUM_MDT):
1880 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1881 if (advance == -1)
1882 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1883 else if (advance == -2)
1884 goto trunc;
1885 else
1886 ND_PRINT((ndo, "\n\t %s", buf));
1887 break;
1888 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1889 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1890 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1891 if (add_path6) {
1892 path_id = EXTRACT_BE_U_4(tptr);
1893 tptr += 4;
1894 }
1895 advance = decode_prefix6(ndo, tptr, len, 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 if (advance == -3)
1901 break; /* bytes left, but not enough */
1902 else
1903 ND_PRINT((ndo, "\n\t %s", buf));
1904 if (add_path6) {
1905 ND_PRINT((ndo, " Path Id: %u", path_id));
1906 }
1907 break;
1908 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1909 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1910 if (advance == -1)
1911 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1912 else if (advance == -2)
1913 goto trunc;
1914 else if (advance == -3)
1915 break; /* bytes left, but not enough */
1916 else
1917 ND_PRINT((ndo, "\n\t %s", buf));
1918 break;
1919 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1920 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1921 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1922 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1923 if (advance == -1)
1924 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1925 else if (advance == -2)
1926 goto trunc;
1927 else
1928 ND_PRINT((ndo, "\n\t %s", buf));
1929 break;
1930 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1931 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1932 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1933 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1934 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1935 if (advance == -1)
1936 ND_PRINT((ndo, "\n\t (illegal length)"));
1937 else if (advance == -2)
1938 goto trunc;
1939 else
1940 ND_PRINT((ndo, "\n\t %s", buf));
1941 break;
1942 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1943 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1944 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1945 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1946 if (advance == -1)
1947 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1948 else if (advance == -2)
1949 goto trunc;
1950 else
1951 ND_PRINT((ndo, "\n\t %s", buf));
1952 break;
1953 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1954 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1955 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1956 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1957 if (advance == -1)
1958 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1959 else if (advance == -2)
1960 goto trunc;
1961 else
1962 ND_PRINT((ndo, "\n\t %s", buf));
1963 break;
1964 default:
1965 ND_TCHECK_LEN(tptr, tlen);
1966 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1967 if (ndo->ndo_vflag <= 1)
1968 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1969 advance = 0;
1970 tptr = pptr + len;
1971 break;
1972 }
1973 if (advance < 0)
1974 break;
1975 tptr += advance;
1976 }
1977 done:
1978 break;
1979
1980 case BGPTYPE_MP_UNREACH_NLRI:
1981 ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
1982 af = EXTRACT_BE_U_2(tptr);
1983 safi = EXTRACT_U_1(tptr + 2);
1984
1985 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1986 tok2str(af_values, "Unknown AFI", af),
1987 af,
1988 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1989 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1990 safi));
1991
1992 if (len == BGP_MP_NLRI_MINSIZE)
1993 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
1994
1995 tptr += 3;
1996
1997 add_path4 = check_add_path(tptr, (len-(tptr - pptr)), 32);
1998 add_path6 = check_add_path(tptr, (len-(tptr - pptr)), 128);
1999
2000 while (tptr < pptr + len) {
2001 switch (af<<8 | safi) {
2002 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
2003 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
2004 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
2005 if (add_path4) {
2006 path_id = EXTRACT_BE_U_4(tptr);
2007 tptr += 4;
2008 }
2009 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
2010 if (advance == -1)
2011 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2012 else if (advance == -2)
2013 goto trunc;
2014 else if (advance == -3)
2015 break; /* bytes left, but not enough */
2016 else
2017 ND_PRINT((ndo, "\n\t %s", buf));
2018 if (add_path4) {
2019 ND_PRINT((ndo, " Path Id: %u", path_id));
2020 }
2021 break;
2022 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
2023 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
2024 if (advance == -1)
2025 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2026 else if (advance == -2)
2027 goto trunc;
2028 else if (advance == -3)
2029 break; /* bytes left, but not enough */
2030 else
2031 ND_PRINT((ndo, "\n\t %s", buf));
2032 break;
2033 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
2034 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
2035 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
2036 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
2037 if (advance == -1)
2038 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2039 else if (advance == -2)
2040 goto trunc;
2041 else
2042 ND_PRINT((ndo, "\n\t %s", buf));
2043 break;
2044 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
2045 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
2046 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
2047 if (add_path6) {
2048 path_id = EXTRACT_BE_U_4(tptr);
2049 tptr += 4;
2050 }
2051 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
2052 if (advance == -1)
2053 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2054 else if (advance == -2)
2055 goto trunc;
2056 else if (advance == -3)
2057 break; /* bytes left, but not enough */
2058 else
2059 ND_PRINT((ndo, "\n\t %s", buf));
2060 if (add_path6) {
2061 ND_PRINT((ndo, " Path Id: %u", path_id));
2062 }
2063 break;
2064 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
2065 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
2066 if (advance == -1)
2067 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2068 else if (advance == -2)
2069 goto trunc;
2070 else if (advance == -3)
2071 break; /* bytes left, but not enough */
2072 else
2073 ND_PRINT((ndo, "\n\t %s", buf));
2074 break;
2075 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
2076 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
2077 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
2078 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
2079 if (advance == -1)
2080 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2081 else if (advance == -2)
2082 goto trunc;
2083 else
2084 ND_PRINT((ndo, "\n\t %s", buf));
2085 break;
2086 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
2087 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2088 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2089 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2090 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
2091 if (advance == -1)
2092 ND_PRINT((ndo, "\n\t (illegal length)"));
2093 else if (advance == -2)
2094 goto trunc;
2095 else
2096 ND_PRINT((ndo, "\n\t %s", buf));
2097 break;
2098 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2099 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2100 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2101 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2102 if (advance == -1)
2103 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2104 else if (advance == -2)
2105 goto trunc;
2106 else
2107 ND_PRINT((ndo, "\n\t %s", buf));
2108 break;
2109 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2110 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2111 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2112 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2113 if (advance == -1)
2114 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2115 else if (advance == -2)
2116 goto trunc;
2117 else
2118 ND_PRINT((ndo, "\n\t %s", buf));
2119 break;
2120 case (AFNUM_INET<<8 | SAFNUM_MDT):
2121 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
2122 if (advance == -1)
2123 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2124 else if (advance == -2)
2125 goto trunc;
2126 else
2127 ND_PRINT((ndo, "\n\t %s", buf));
2128 break;
2129 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
2130 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
2131 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
2132 if (advance == -1)
2133 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2134 else if (advance == -2)
2135 goto trunc;
2136 else
2137 ND_PRINT((ndo, "\n\t %s", buf));
2138 break;
2139 default:
2140 ND_TCHECK_LEN(tptr - 3, tlen);
2141 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
2142 if (ndo->ndo_vflag <= 1)
2143 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
2144 advance = 0;
2145 tptr = pptr + len;
2146 break;
2147 }
2148 if (advance < 0)
2149 break;
2150 tptr += advance;
2151 }
2152 break;
2153 case BGPTYPE_EXTD_COMMUNITIES:
2154 if (len % 8) {
2155 ND_PRINT((ndo, "invalid len"));
2156 break;
2157 }
2158 while (tlen>0) {
2159 uint16_t extd_comm;
2160
2161 ND_TCHECK_2(tptr);
2162 extd_comm=EXTRACT_BE_U_2(tptr);
2163
2164 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]",
2165 tok2str(bgp_extd_comm_subtype_values,
2166 "unknown extd community typecode",
2167 extd_comm),
2168 extd_comm,
2169 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2170
2171 ND_TCHECK_6(tptr + 2);
2172 switch(extd_comm) {
2173 case BGP_EXT_COM_RT_0:
2174 case BGP_EXT_COM_RO_0:
2175 case BGP_EXT_COM_L2VPN_RT_0:
2176 ND_PRINT((ndo, ": %u:%u (= %s)",
2177 EXTRACT_BE_U_2(tptr + 2),
2178 EXTRACT_BE_U_4(tptr + 4),
2179 ipaddr_string(ndo, tptr+4)));
2180 break;
2181 case BGP_EXT_COM_RT_1:
2182 case BGP_EXT_COM_RO_1:
2183 case BGP_EXT_COM_L2VPN_RT_1:
2184 case BGP_EXT_COM_VRF_RT_IMP:
2185 ND_PRINT((ndo, ": %s:%u",
2186 ipaddr_string(ndo, tptr+2),
2187 EXTRACT_BE_U_2(tptr + 6)));
2188 break;
2189 case BGP_EXT_COM_RT_2:
2190 case BGP_EXT_COM_RO_2:
2191 ND_PRINT((ndo, ": %s:%u",
2192 as_printf(ndo, astostr, sizeof(astostr),
2193 EXTRACT_BE_U_4(tptr + 2)), EXTRACT_BE_U_2(tptr + 6)));
2194 break;
2195 case BGP_EXT_COM_LINKBAND:
2196 bw.i = EXTRACT_BE_U_4(tptr + 2);
2197 ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2198 bw.f*8/1000000));
2199 break;
2200 case BGP_EXT_COM_VPN_ORIGIN:
2201 case BGP_EXT_COM_VPN_ORIGIN2:
2202 case BGP_EXT_COM_VPN_ORIGIN3:
2203 case BGP_EXT_COM_VPN_ORIGIN4:
2204 case BGP_EXT_COM_OSPF_RID:
2205 case BGP_EXT_COM_OSPF_RID2:
2206 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2)));
2207 break;
2208 case BGP_EXT_COM_OSPF_RTYPE:
2209 case BGP_EXT_COM_OSPF_RTYPE2:
2210 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2211 ipaddr_string(ndo, tptr+2),
2212 tok2str(bgp_extd_comm_ospf_rtype_values,
2213 "unknown (0x%02x)",
2214 EXTRACT_U_1((tptr + 6))),
2215 (EXTRACT_U_1(tptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2216 ((EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_EXT) || (EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2217 break;
2218 case BGP_EXT_COM_L2INFO:
2219 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2220 tok2str(l2vpn_encaps_values,
2221 "unknown encaps",
2222 EXTRACT_U_1((tptr + 2))),
2223 EXTRACT_U_1((tptr + 3)),
2224 EXTRACT_BE_U_2(tptr + 4)));
2225 break;
2226 case BGP_EXT_COM_SOURCE_AS:
2227 ND_PRINT((ndo, ": AS %u", EXTRACT_BE_U_2(tptr + 2)));
2228 break;
2229 default:
2230 ND_TCHECK_8(tptr);
2231 print_unknown_data(ndo, tptr, "\n\t ", 8);
2232 break;
2233 }
2234 tlen -= 8;
2235 tptr += 8;
2236 }
2237 break;
2238
2239 case BGPTYPE_PMSI_TUNNEL:
2240 {
2241 uint8_t tunnel_type, flags;
2242
2243 ND_TCHECK_5(tptr);
2244 flags = EXTRACT_U_1(tptr);
2245 tunnel_type = EXTRACT_U_1(tptr + 1);
2246 tlen = len;
2247
2248 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2249 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2250 tunnel_type,
2251 bittok2str(bgp_pmsi_flag_values, "none", flags),
2252 EXTRACT_BE_U_3(tptr + 2)>>4));
2253
2254 tptr +=5;
2255 tlen -= 5;
2256
2257 switch (tunnel_type) {
2258 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2259 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2260 ND_TCHECK_8(tptr);
2261 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s",
2262 ipaddr_string(ndo, tptr),
2263 ipaddr_string(ndo, tptr+4)));
2264 break;
2265
2266 case BGP_PMSI_TUNNEL_PIM_SSM:
2267 ND_TCHECK_8(tptr);
2268 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s",
2269 ipaddr_string(ndo, tptr),
2270 ipaddr_string(ndo, tptr+4)));
2271 break;
2272 case BGP_PMSI_TUNNEL_INGRESS:
2273 ND_TCHECK_4(tptr);
2274 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s",
2275 ipaddr_string(ndo, tptr)));
2276 break;
2277 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2278 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2279 ND_TCHECK_8(tptr);
2280 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x",
2281 ipaddr_string(ndo, tptr),
2282 EXTRACT_BE_U_4(tptr + 4)));
2283 break;
2284 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2285 ND_TCHECK_8(tptr);
2286 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2287 ipaddr_string(ndo, tptr),
2288 EXTRACT_BE_U_4(tptr + 4)));
2289 break;
2290 default:
2291 if (ndo->ndo_vflag <= 1) {
2292 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2293 }
2294 }
2295 break;
2296 }
2297 case BGPTYPE_AIGP:
2298 {
2299 uint8_t type;
2300 uint16_t length;
2301
2302 tlen = len;
2303
2304 while (tlen >= 3) {
2305
2306 ND_TCHECK_3(tptr);
2307
2308 type = EXTRACT_U_1(tptr);
2309 length = EXTRACT_BE_U_2(tptr + 1);
2310 tptr += 3;
2311 tlen -= 3;
2312
2313 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u",
2314 tok2str(bgp_aigp_values, "Unknown", type),
2315 type, length));
2316
2317 if (length < 3)
2318 goto trunc;
2319 length -= 3;
2320
2321 /*
2322 * Check if we can read the TLV data.
2323 */
2324 ND_TCHECK_LEN(tptr + 3, length);
2325
2326 switch (type) {
2327
2328 case BGP_AIGP_TLV:
2329 if (length < 8)
2330 goto trunc;
2331 ND_PRINT((ndo, ", metric %" PRIu64,
2332 EXTRACT_BE_U_8(tptr)));
2333 break;
2334
2335 default:
2336 if (ndo->ndo_vflag <= 1) {
2337 print_unknown_data(ndo, tptr,"\n\t ", length);
2338 }
2339 }
2340
2341 tptr += length;
2342 tlen -= length;
2343 }
2344 break;
2345 }
2346 case BGPTYPE_ATTR_SET:
2347 ND_TCHECK_4(tptr);
2348 if (len < 4)
2349 goto trunc;
2350 ND_PRINT((ndo, "\n\t Origin AS: %s",
2351 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr))));
2352 tptr += 4;
2353 len -= 4;
2354
2355 while (len) {
2356 u_int aflags, alenlen, alen;
2357
2358 ND_TCHECK_2(tptr);
2359 if (len < 2)
2360 goto trunc;
2361 aflags = EXTRACT_U_1(tptr);
2362 atype = EXTRACT_U_1(tptr + 1);
2363 tptr += 2;
2364 len -= 2;
2365 alenlen = bgp_attr_lenlen(aflags, tptr);
2366 ND_TCHECK_LEN(tptr, alenlen);
2367 if (len < alenlen)
2368 goto trunc;
2369 alen = bgp_attr_len(aflags, tptr);
2370 tptr += alenlen;
2371 len -= alenlen;
2372
2373 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2374 tok2str(bgp_attr_values,
2375 "Unknown Attribute", atype),
2376 atype,
2377 alen));
2378
2379 if (aflags) {
2380 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2381 aflags & 0x80 ? "O" : "",
2382 aflags & 0x40 ? "T" : "",
2383 aflags & 0x20 ? "P" : "",
2384 aflags & 0x10 ? "E" : ""));
2385 if (aflags & 0xf)
2386 ND_PRINT((ndo, "+%x", aflags & 0xf));
2387 ND_PRINT((ndo, "]: "));
2388 }
2389 /* FIXME check for recursion */
2390 if (!bgp_attr_print(ndo, atype, tptr, alen))
2391 return 0;
2392 tptr += alen;
2393 len -= alen;
2394 }
2395 break;
2396
2397 case BGPTYPE_LARGE_COMMUNITY:
2398 if (len == 0 || len % 12) {
2399 ND_PRINT((ndo, "invalid len"));
2400 break;
2401 }
2402 ND_PRINT((ndo, "\n\t "));
2403 while (len > 0) {
2404 ND_TCHECK_LEN(tptr, 12);
2405 ND_PRINT((ndo, "%u:%u:%u%s",
2406 EXTRACT_BE_U_4(tptr),
2407 EXTRACT_BE_U_4(tptr + 4),
2408 EXTRACT_BE_U_4(tptr + 8),
2409 (len > 12) ? ", " : ""));
2410 tptr += 12;
2411 len -= 12;
2412 }
2413 break;
2414 default:
2415 ND_TCHECK_LEN(pptr, len);
2416 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2417 if (ndo->ndo_vflag <= 1)
2418 print_unknown_data(ndo, pptr, "\n\t ", len);
2419 break;
2420 }
2421 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2422 ND_TCHECK_LEN(pptr, len);
2423 print_unknown_data(ndo, pptr, "\n\t ", len);
2424 }
2425 return 1;
2426
2427 trunc:
2428 return 0;
2429 }
2430
2431 static void
2432 bgp_capabilities_print(netdissect_options *ndo,
2433 const u_char *opt, u_int caps_len)
2434 {
2435 u_int cap_type, cap_len, tcap_len, cap_offset;
2436 u_int i = 0;
2437
2438 while (i < caps_len) {
2439 ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
2440 cap_type=EXTRACT_U_1(opt + i);
2441 cap_len=EXTRACT_U_1(opt + i + 1);
2442 tcap_len=cap_len;
2443 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2444 tok2str(bgp_capcode_values, "Unknown", cap_type),
2445 cap_type,
2446 cap_len));
2447 ND_TCHECK_LEN(opt + 2 + i, cap_len);
2448 switch (cap_type) {
2449 case BGP_CAPCODE_MP:
2450 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2451 tok2str(af_values, "Unknown", EXTRACT_BE_U_2(opt + i + 2)),
2452 EXTRACT_BE_U_2(opt + i + 2),
2453 tok2str(bgp_safi_values, "Unknown", EXTRACT_U_1(opt + i + 5)),
2454 EXTRACT_U_1(opt + i + 5)));
2455 break;
2456 case BGP_CAPCODE_RESTART:
2457 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2458 ((EXTRACT_U_1(opt + i + 2))&0x80) ? "R" : "none",
2459 EXTRACT_BE_U_2(opt + i + 2)&0xfff));
2460 tcap_len-=2;
2461 cap_offset=4;
2462 while(tcap_len>=4) {
2463 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2464 tok2str(af_values,"Unknown",
2465 EXTRACT_BE_U_2(opt + i + cap_offset)),
2466 EXTRACT_BE_U_2(opt + i + cap_offset),
2467 tok2str(bgp_safi_values,"Unknown",
2468 EXTRACT_U_1(opt + i + cap_offset + 2)),
2469 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2470 ((EXTRACT_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" ));
2471 tcap_len -= 4;
2472 cap_offset += 4;
2473 }
2474 break;
2475 case BGP_CAPCODE_RR:
2476 case BGP_CAPCODE_RR_CISCO:
2477 break;
2478 case BGP_CAPCODE_AS_NEW:
2479
2480 /*
2481 * Extract the 4 byte AS number encoded.
2482 */
2483 if (cap_len == 4) {
2484 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2485 as_printf(ndo, astostr, sizeof(astostr),
2486 EXTRACT_BE_U_4(opt + i + 2))));
2487 }
2488 break;
2489 case BGP_CAPCODE_ADD_PATH:
2490 cap_offset=2;
2491 if (tcap_len == 0) {
2492 ND_PRINT((ndo, " (bogus)")); /* length */
2493 break;
2494 }
2495 while (tcap_len > 0) {
2496 if (tcap_len < 4) {
2497 ND_PRINT((ndo, "\n\t\t(invalid)"));
2498 break;
2499 }
2500 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2501 tok2str(af_values,"Unknown",EXTRACT_BE_U_2(opt + i + cap_offset)),
2502 EXTRACT_BE_U_2(opt + i + cap_offset),
2503 tok2str(bgp_safi_values,"Unknown",EXTRACT_U_1(opt + i + cap_offset + 2)),
2504 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2505 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",EXTRACT_U_1(opt + i + cap_offset + 3))
2506 ));
2507 tcap_len -= 4;
2508 cap_offset += 4;
2509 }
2510 break;
2511 default:
2512 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2513 cap_type));
2514 if (ndo->ndo_vflag <= 1)
2515 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2516 cap_len);
2517 break;
2518 }
2519 if (ndo->ndo_vflag > 1 && cap_len > 0) {
2520 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2521 }
2522 i += BGP_CAP_HEADER_SIZE + cap_len;
2523 }
2524 return;
2525
2526 trunc:
2527 ND_PRINT((ndo, "[|BGP]"));
2528 }
2529
2530 static void
2531 bgp_open_print(netdissect_options *ndo,
2532 const u_char *dat, u_int length)
2533 {
2534 const struct bgp_open *bgp_open_header;
2535 u_int optslen;
2536 const struct bgp_opt *bgpopt;
2537 const u_char *opt;
2538 u_int i;
2539
2540 ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
2541 if (length < BGP_OPEN_SIZE)
2542 goto trunc;
2543
2544 bgp_open_header = (const struct bgp_open *)dat;
2545
2546 ND_PRINT((ndo, "\n\t Version %u, ",
2547 EXTRACT_U_1(bgp_open_header->bgpo_version)));
2548 ND_PRINT((ndo, "my AS %s, ",
2549 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(bgp_open_header->bgpo_myas))));
2550 ND_PRINT((ndo, "Holdtime %us, ",
2551 EXTRACT_BE_U_2(bgp_open_header->bgpo_holdtime)));
2552 ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgp_open_header->bgpo_id)));
2553 optslen = EXTRACT_U_1(bgp_open_header->bgpo_optlen);
2554 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", optslen));
2555
2556 opt = dat + BGP_OPEN_SIZE;
2557 length -= BGP_OPEN_SIZE;
2558
2559 i = 0;
2560 while (i < optslen) {
2561 uint8_t opt_type, opt_len;
2562
2563 ND_TCHECK_LEN(opt + i, BGP_OPT_SIZE);
2564 if (length < BGP_OPT_SIZE + i)
2565 goto trunc;
2566 bgpopt = (const struct bgp_opt *)(opt + i);
2567 opt_type = EXTRACT_U_1(bgpopt->bgpopt_type);
2568 opt_len = EXTRACT_U_1(bgpopt->bgpopt_len);
2569 if (BGP_OPT_SIZE + i + opt_len > optslen) {
2570 ND_PRINT((ndo, "\n\t Option %u, length: %u, goes past the end of the options",
2571 opt_type, opt_len));
2572 break;
2573 }
2574
2575 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u",
2576 tok2str(bgp_opt_values,"Unknown",opt_type),
2577 opt_type,
2578 opt_len));
2579
2580 /* now let's decode the options we know*/
2581 switch(opt_type) {
2582
2583 case BGP_OPT_CAP:
2584 bgp_capabilities_print(ndo, opt + BGP_OPT_SIZE + i,
2585 opt_len);
2586 break;
2587
2588 case BGP_OPT_AUTH:
2589 default:
2590 ND_PRINT((ndo, "\n\t no decoder for option %u",
2591 opt_type));
2592 break;
2593 }
2594 i += BGP_OPT_SIZE + opt_len;
2595 }
2596 return;
2597 trunc:
2598 ND_PRINT((ndo, "[|BGP]"));
2599 }
2600
2601 static void
2602 bgp_update_print(netdissect_options *ndo,
2603 const u_char *dat, u_int length)
2604 {
2605 const u_char *p;
2606 u_int withdrawn_routes_len;
2607 char buf[MAXHOSTNAMELEN + 100];
2608 int wpfx;
2609 u_int len;
2610 int i;
2611 int add_path;
2612 u_int path_id = 0;
2613
2614 ND_TCHECK_LEN(dat, BGP_SIZE);
2615 if (length < BGP_SIZE)
2616 goto trunc;
2617 p = dat + BGP_SIZE;
2618 length -= BGP_SIZE;
2619
2620 /* Unfeasible routes */
2621 ND_TCHECK_2(p);
2622 if (length < 2)
2623 goto trunc;
2624 withdrawn_routes_len = EXTRACT_BE_U_2(p);
2625 p += 2;
2626 length -= 2;
2627 if (withdrawn_routes_len > 1) {
2628 /*
2629 * Without keeping state from the original NLRI message,
2630 * it's not possible to tell if this a v4 or v6 route,
2631 * so only try to decode it if we're not v6 enabled.
2632 */
2633 ND_TCHECK_LEN(p, withdrawn_routes_len);
2634 if (length < withdrawn_routes_len)
2635 goto trunc;
2636 ND_PRINT((ndo, "\n\t Withdrawn routes:"));
2637 add_path = check_add_path(p, withdrawn_routes_len, 32);
2638 while (withdrawn_routes_len > 0) {
2639 if (add_path) {
2640 path_id = EXTRACT_BE_U_4(p);
2641 p += 4;
2642 length -= 4;
2643 withdrawn_routes_len -= 4;
2644 }
2645 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
2646 if (wpfx == -1) {
2647 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2648 break;
2649 } else if (wpfx == -2)
2650 goto trunc;
2651 else if (wpfx == -3)
2652 goto trunc; /* bytes left, but not enough */
2653 else {
2654 ND_PRINT((ndo, "\n\t %s", buf));
2655 if (add_path) {
2656 ND_PRINT((ndo, " Path Id: %u", path_id));
2657 }
2658 p += wpfx;
2659 length -= wpfx;
2660 withdrawn_routes_len -= wpfx;
2661 }
2662 }
2663 } else {
2664 p += withdrawn_routes_len;
2665 length -= withdrawn_routes_len;
2666 }
2667
2668 ND_TCHECK_2(p);
2669 if (length < 2)
2670 goto trunc;
2671 len = EXTRACT_BE_U_2(p);
2672 p += 2;
2673 length -= 2;
2674
2675 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2676 /* No withdrawn routes, no path attributes, no NLRI */
2677 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2678 return;
2679 }
2680
2681 if (len) {
2682 /* do something more useful!*/
2683 while (len) {
2684 u_int aflags, atype, alenlen, alen;
2685
2686 ND_TCHECK_2(p);
2687 if (len < 2)
2688 goto trunc;
2689 if (length < 2)
2690 goto trunc;
2691 aflags = EXTRACT_U_1(p);
2692 atype = EXTRACT_U_1(p + 1);
2693 p += 2;
2694 len -= 2;
2695 length -= 2;
2696 alenlen = bgp_attr_lenlen(aflags, p);
2697 ND_TCHECK_LEN(p, alenlen);
2698 if (len < alenlen)
2699 goto trunc;
2700 if (length < alenlen)
2701 goto trunc;
2702 alen = bgp_attr_len(aflags, p);
2703 p += alenlen;
2704 len -= alenlen;
2705 length -= alenlen;
2706
2707 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2708 tok2str(bgp_attr_values, "Unknown Attribute", atype),
2709 atype,
2710 alen));
2711
2712 if (aflags) {
2713 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2714 aflags & 0x80 ? "O" : "",
2715 aflags & 0x40 ? "T" : "",
2716 aflags & 0x20 ? "P" : "",
2717 aflags & 0x10 ? "E" : ""));
2718 if (aflags & 0xf)
2719 ND_PRINT((ndo, "+%x", aflags & 0xf));
2720 ND_PRINT((ndo, "]: "));
2721 }
2722 if (len < alen)
2723 goto trunc;
2724 if (length < alen)
2725 goto trunc;
2726 if (!bgp_attr_print(ndo, atype, p, alen))
2727 goto trunc;
2728 p += alen;
2729 len -= alen;
2730 length -= alen;
2731 }
2732 }
2733
2734 if (length) {
2735 add_path = check_add_path(p, length, 32);
2736 ND_PRINT((ndo, "\n\t Updated routes:"));
2737 while (length > 0) {
2738 if (add_path) {
2739 path_id = EXTRACT_BE_U_4(p);
2740 p += 4;
2741 length -= 4;
2742 }
2743 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2744 if (i == -1) {
2745 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2746 break;
2747 } else if (i == -2)
2748 goto trunc;
2749 else if (i == -3)
2750 goto trunc; /* bytes left, but not enough */
2751 else {
2752 ND_PRINT((ndo, "\n\t %s", buf));
2753 if (add_path) {
2754 ND_PRINT((ndo, " Path Id: %u", path_id));
2755 }
2756 p += i;
2757 length -= i;
2758 }
2759 }
2760 }
2761 return;
2762 trunc:
2763 ND_PRINT((ndo, "[|BGP]"));
2764 }
2765
2766 static void
2767 bgp_notification_print(netdissect_options *ndo,
2768 const u_char *dat, u_int length)
2769 {
2770 const struct bgp_notification *bgp_notification_header;
2771 const u_char *tptr;
2772 uint8_t bgpn_major, bgpn_minor;
2773 uint8_t shutdown_comm_length;
2774 uint8_t remainder_offset;
2775
2776 ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
2777 if (length<BGP_NOTIFICATION_SIZE)
2778 return;
2779
2780 bgp_notification_header = (const struct bgp_notification *)dat;
2781 bgpn_major = EXTRACT_U_1(bgp_notification_header->bgpn_major);
2782 bgpn_minor = EXTRACT_U_1(bgp_notification_header->bgpn_minor);
2783
2784 ND_PRINT((ndo, ", %s (%u)",
2785 tok2str(bgp_notify_major_values, "Unknown Error",
2786 bgpn_major),
2787 bgpn_major));
2788
2789 switch (bgpn_major) {
2790
2791 case BGP_NOTIFY_MAJOR_MSG:
2792 ND_PRINT((ndo, ", subcode %s (%u)",
2793 tok2str(bgp_notify_minor_msg_values, "Unknown",
2794 bgpn_minor),
2795 bgpn_minor));
2796 break;
2797 case BGP_NOTIFY_MAJOR_OPEN:
2798 ND_PRINT((ndo, ", subcode %s (%u)",
2799 tok2str(bgp_notify_minor_open_values, "Unknown",
2800 bgpn_minor),
2801 bgpn_minor));
2802 break;
2803 case BGP_NOTIFY_MAJOR_UPDATE:
2804 ND_PRINT((ndo, ", subcode %s (%u)",
2805 tok2str(bgp_notify_minor_update_values, "Unknown",
2806 bgpn_minor),
2807 bgpn_minor));
2808 break;
2809 case BGP_NOTIFY_MAJOR_FSM:
2810 ND_PRINT((ndo, " subcode %s (%u)",
2811 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2812 bgpn_minor),
2813 bgpn_minor));
2814 break;
2815 case BGP_NOTIFY_MAJOR_CAP:
2816 ND_PRINT((ndo, " subcode %s (%u)",
2817 tok2str(bgp_notify_minor_cap_values, "Unknown",
2818 bgpn_minor),
2819 bgpn_minor));
2820 break;
2821 case BGP_NOTIFY_MAJOR_CEASE:
2822 ND_PRINT((ndo, ", subcode %s (%u)",
2823 tok2str(bgp_notify_minor_cease_values, "Unknown",
2824 bgpn_minor),
2825 bgpn_minor));
2826
2827 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2828 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2829 */
2830 if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2831 tptr = dat + BGP_NOTIFICATION_SIZE;
2832 ND_TCHECK_7(tptr);
2833 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2834 tok2str(af_values, "Unknown", EXTRACT_BE_U_2(tptr)),
2835 EXTRACT_BE_U_2(tptr),
2836 tok2str(bgp_safi_values, "Unknown", EXTRACT_U_1((tptr + 2))),
2837 EXTRACT_U_1((tptr + 2)),
2838 EXTRACT_BE_U_4(tptr + 3)));
2839 }
2840 /*
2841 * draft-ietf-idr-shutdown describes a method to send a communication
2842 * intended for human consumption regarding the Administrative Shutdown
2843 */
2844 if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
2845 bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
2846 length >= BGP_NOTIFICATION_SIZE + 1) {
2847 tptr = dat + BGP_NOTIFICATION_SIZE;
2848 ND_TCHECK_1(tptr);
2849 shutdown_comm_length = EXTRACT_U_1(tptr);
2850 remainder_offset = 0;
2851 /* garbage, hexdump it all */
2852 if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN ||
2853 shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) {
2854 ND_PRINT((ndo, ", invalid Shutdown Communication length"));
2855 }
2856 else if (shutdown_comm_length == 0) {
2857 ND_PRINT((ndo, ", empty Shutdown Communication"));
2858 remainder_offset += 1;
2859 }
2860 /* a proper shutdown communication */
2861 else {
2862 ND_TCHECK_LEN(tptr + 1, shutdown_comm_length);
2863 ND_PRINT((ndo, ", Shutdown Communication (length: %u): \"", shutdown_comm_length));
2864 (void)fn_printn(ndo, tptr+1, shutdown_comm_length, NULL);
2865 ND_PRINT((ndo, "\""));
2866 remainder_offset += shutdown_comm_length + 1;
2867 }
2868 /* if there is trailing data, hexdump it */
2869 if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) {
2870 ND_PRINT((ndo, ", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE)));
2871 hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2872 }
2873 }
2874 break;
2875 default:
2876 break;
2877 }
2878
2879 return;
2880 trunc:
2881 ND_PRINT((ndo, "[|BGP]"));
2882 }
2883
2884 static void
2885 bgp_route_refresh_print(netdissect_options *ndo,
2886 const u_char *pptr, u_int len)
2887 {
2888 const struct bgp_route_refresh *bgp_route_refresh_header;
2889
2890 ND_TCHECK_LEN(pptr, BGP_ROUTE_REFRESH_SIZE);
2891
2892 /* some little sanity checking */
2893 if (len<BGP_ROUTE_REFRESH_SIZE)
2894 return;
2895
2896 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2897
2898 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)",
2899 tok2str(af_values,"Unknown",
2900 EXTRACT_BE_U_2(bgp_route_refresh_header->afi)),
2901 EXTRACT_BE_U_2(bgp_route_refresh_header->afi),
2902 tok2str(bgp_safi_values,"Unknown",
2903 EXTRACT_U_1(bgp_route_refresh_header->safi)),
2904 EXTRACT_U_1(bgp_route_refresh_header->safi)));
2905
2906 if (ndo->ndo_vflag > 1) {
2907 ND_TCHECK_LEN(pptr, len);
2908 print_unknown_data(ndo, pptr, "\n\t ", len);
2909 }
2910
2911 return;
2912 trunc:
2913 ND_PRINT((ndo, "[|BGP]"));
2914 }
2915
2916 static int
2917 bgp_pdu_print(netdissect_options *ndo,
2918 const u_char *dat, u_int length)
2919 {
2920 const struct bgp *bgp_header;
2921 uint8_t bgp_type;
2922
2923 ND_TCHECK_LEN(dat, BGP_SIZE);
2924 bgp_header = (const struct bgp *)dat;
2925 bgp_type = EXTRACT_U_1(bgp_header->bgp_type);
2926
2927 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2928 tok2str(bgp_msg_values, "Unknown", bgp_type),
2929 bgp_type,
2930 length));
2931
2932 switch (bgp_type) {
2933 case BGP_OPEN:
2934 bgp_open_print(ndo, dat, length);
2935 break;
2936 case BGP_UPDATE:
2937 bgp_update_print(ndo, dat, length);
2938 break;
2939 case BGP_NOTIFICATION:
2940 bgp_notification_print(ndo, dat, length);
2941 break;
2942 case BGP_KEEPALIVE:
2943 break;
2944 case BGP_ROUTE_REFRESH:
2945 bgp_route_refresh_print(ndo, dat, length);
2946 break;
2947 default:
2948 /* we have no decoder for the BGP message */
2949 ND_TCHECK_LEN(dat, length);
2950 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp_type));
2951 print_unknown_data(ndo, dat, "\n\t ", length);
2952 break;
2953 }
2954 return 1;
2955 trunc:
2956 ND_PRINT((ndo, "[|BGP]"));
2957 return 0;
2958 }
2959
2960 void
2961 bgp_print(netdissect_options *ndo,
2962 const u_char *dat, u_int length)
2963 {
2964 const u_char *p;
2965 const u_char *ep;
2966 const u_char *start;
2967 const u_char marker[] = {
2968 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2969 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2970 };
2971 const struct bgp *bgp_header;
2972 uint16_t hlen;
2973
2974 ep = dat + length;
2975 if (ndo->ndo_snapend < dat + length)
2976 ep = ndo->ndo_snapend;
2977
2978 ND_PRINT((ndo, ": BGP"));
2979
2980 if (ndo->ndo_vflag < 1) /* lets be less chatty */
2981 return;
2982
2983 p = dat;
2984 start = p;
2985 while (p < ep) {
2986 if (!ND_TTEST_1(p))
2987 break;
2988 if (EXTRACT_U_1(p) != 0xff) {
2989 p++;
2990 continue;
2991 }
2992
2993 if (!ND_TTEST_LEN(p, sizeof(marker)))
2994 break;
2995 if (memcmp(p, marker, sizeof(marker)) != 0) {
2996 p++;
2997 continue;
2998 }
2999
3000 /* found BGP header */
3001 ND_TCHECK_LEN(p, BGP_SIZE);
3002 bgp_header = (const struct bgp *)p;
3003
3004 if (start != p)
3005 ND_PRINT((ndo, " [|BGP]"));
3006
3007 hlen = EXTRACT_BE_U_2(bgp_header->bgp_len);
3008 if (hlen < BGP_SIZE) {
3009 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
3010 BGP_SIZE));
3011 break;
3012 }
3013
3014 if (ND_TTEST_LEN(p, hlen)) {
3015 if (!bgp_pdu_print(ndo, p, hlen))
3016 return;
3017 p += hlen;
3018 start = p;
3019 } else {
3020 ND_PRINT((ndo, "\n[|BGP %s]",
3021 tok2str(bgp_msg_values,
3022 "Unknown Message Type",
3023 EXTRACT_U_1(bgp_header->bgp_type))));
3024 break;
3025 }
3026 }
3027
3028 return;
3029
3030 trunc:
3031 ND_PRINT((ndo, " [|BGP]"));
3032 }
3033
3034 /*
3035 * Local Variables:
3036 * c-style: whitesmith
3037 * c-basic-offset: 4
3038 * End:
3039 */
[mirror] the TCPdump network dissector