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Clean up types to squelch narrowing warnings.
[tcpdump] / print-bgp.c
1 /*
2 * Copyright (C) 1999 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * Extensively modified by Hannes Gredler (hannes@gredler.at) for more
30 * complete BGP support.
31 */
32
33 /* \summary: Border Gateway Protocol (BGP) printer */
34
35 /* specification: RFC 4271 */
36
37 #ifdef HAVE_CONFIG_H
38 #include <config.h>
39 #endif
40
41 #include "netdissect-stdinc.h"
42
43 #include <stdio.h>
44 #include <string.h>
45
46 #include "netdissect.h"
47 #include "addrtoname.h"
48 #include "extract.h"
49 #include "af.h"
50 #include "l2vpn.h"
51
52 struct bgp {
53 nd_byte bgp_marker[16];
54 nd_uint16_t bgp_len;
55 nd_uint8_t bgp_type;
56 };
57 #define BGP_SIZE 19 /* unaligned */
58
59 #define BGP_OPEN 1
60 #define BGP_UPDATE 2
61 #define BGP_NOTIFICATION 3
62 #define BGP_KEEPALIVE 4
63 #define BGP_ROUTE_REFRESH 5
64
65 static const struct tok bgp_msg_values[] = {
66 { BGP_OPEN, "Open"},
67 { BGP_UPDATE, "Update"},
68 { BGP_NOTIFICATION, "Notification"},
69 { BGP_KEEPALIVE, "Keepalive"},
70 { BGP_ROUTE_REFRESH, "Route Refresh"},
71 { 0, NULL}
72 };
73
74 struct bgp_open {
75 nd_byte bgpo_marker[16];
76 nd_uint16_t bgpo_len;
77 nd_uint8_t bgpo_type;
78 nd_uint8_t bgpo_version;
79 nd_uint16_t bgpo_myas;
80 nd_uint16_t bgpo_holdtime;
81 nd_uint32_t bgpo_id;
82 nd_uint8_t bgpo_optlen;
83 /* options should follow */
84 };
85 #define BGP_OPEN_SIZE 29 /* unaligned */
86
87 struct bgp_opt {
88 nd_uint8_t bgpopt_type;
89 nd_uint8_t bgpopt_len;
90 /* variable length */
91 };
92 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
93 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
94
95 struct bgp_notification {
96 nd_byte bgpn_marker[16];
97 nd_uint16_t bgpn_len;
98 nd_uint8_t bgpn_type;
99 nd_uint8_t bgpn_major;
100 nd_uint8_t bgpn_minor;
101 };
102 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
103
104 struct bgp_route_refresh {
105 nd_byte bgp_marker[16];
106 nd_uint16_t len;
107 nd_uint8_t type; /* No padding after this; afi is, in fact, not aligned */
108 nd_uint16_t afi;
109 nd_uint8_t res;
110 nd_uint8_t safi;
111 };
112 #define BGP_ROUTE_REFRESH_SIZE 23
113
114 #define bgp_attr_lenlen(flags, p) \
115 (((flags) & 0x10) ? 2U : 1U)
116 #define bgp_attr_len(flags, p) \
117 (((flags) & 0x10) ? GET_BE_U_2(p) : GET_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 - RFC 4360 */
414 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
415 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
416 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
417 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
418 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
419 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
420 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
421 /* rfc2547 bgp-mpls-vpns */
422 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
423 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatibility */
424 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatibility */
425 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatibility */
426
427 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
428 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatibility */
429
430 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
431 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatibility */
432
433 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
434
435 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
436 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
437 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
438 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */
439
440 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */
441 #define BGP_EXT_COM_EIGRP_GEN 0x8800
442 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801
443 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
444 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803
445 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804
446 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
447
448 static const struct tok bgp_extd_comm_flag_values[] = {
449 { 0x8000, "vendor-specific"},
450 { 0x4000, "non-transitive"},
451 { 0, NULL},
452 };
453
454 static const struct tok bgp_extd_comm_subtype_values[] = {
455 { BGP_EXT_COM_RT_0, "target"},
456 { BGP_EXT_COM_RT_1, "target"},
457 { BGP_EXT_COM_RT_2, "target"},
458 { BGP_EXT_COM_RO_0, "origin"},
459 { BGP_EXT_COM_RO_1, "origin"},
460 { BGP_EXT_COM_RO_2, "origin"},
461 { BGP_EXT_COM_LINKBAND, "link-BW"},
462 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
463 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
464 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
465 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
466 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
467 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
468 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
469 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
470 { BGP_EXT_COM_L2INFO, "layer2-info"},
471 { BGP_EXT_COM_EIGRP_GEN, "eigrp-general-route (flag, tag)" },
472 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY, "eigrp-route-metric (AS, delay)" },
473 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW, "eigrp-route-metric (reliability, nexthop, bandwidth)" },
474 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU, "eigrp-route-metric (load, MTU)" },
475 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID, "eigrp-external-route (remote-AS, remote-ID)" },
476 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC, "eigrp-external-route (remote-proto, remote-metric)" },
477 { BGP_EXT_COM_SOURCE_AS, "source-AS" },
478 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
479 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
480 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
481 { 0, NULL},
482 };
483
484 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
485 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
486 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
487 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
488 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
489 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
490 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
491 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
492
493 static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
494 { BGP_OSPF_RTYPE_RTR, "Router" },
495 { BGP_OSPF_RTYPE_NET, "Network" },
496 { BGP_OSPF_RTYPE_SUM, "Summary" },
497 { BGP_OSPF_RTYPE_EXT, "External" },
498 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
499 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
500 { 0, NULL },
501 };
502
503 /* ADD-PATH Send/Receive field values */
504 static const struct tok bgp_add_path_recvsend[] = {
505 { 1, "Receive" },
506 { 2, "Send" },
507 { 3, "Both" },
508 { 0, NULL },
509 };
510
511 static char astostr[20];
512
513 /*
514 * as_printf
515 *
516 * Convert an AS number into a string and return string pointer.
517 *
518 * Depending on bflag is set or not, AS number is converted into ASDOT notation
519 * or plain number notation.
520 *
521 */
522 static char *
523 as_printf(netdissect_options *ndo,
524 char *str, size_t size, u_int asnum)
525 {
526 if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
527 nd_snprintf(str, size, "%u", asnum);
528 } else {
529 nd_snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
530 }
531 return str;
532 }
533
534 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
535
536 int
537 decode_prefix4(netdissect_options *ndo,
538 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
539 {
540 struct in_addr addr;
541 u_int plen, plenbytes;
542
543 ND_TCHECK_1(pptr);
544 ITEMCHECK(1);
545 plen = GET_U_1(pptr);
546 if (32 < plen)
547 return -1;
548 itemlen -= 1;
549
550 memset(&addr, 0, sizeof(addr));
551 plenbytes = (plen + 7) / 8;
552 ND_TCHECK_LEN(pptr + 1, plenbytes);
553 ITEMCHECK(plenbytes);
554 memcpy(&addr, pptr + 1, plenbytes);
555 if (plen % 8) {
556 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
557 }
558 nd_snprintf(buf, buflen, "%s/%u", ipaddr_string(ndo, (const u_char *)&addr), plen);
559 return 1 + plenbytes;
560
561 trunc:
562 return -2;
563
564 badtlv:
565 return -3;
566 }
567
568 static int
569 decode_labeled_prefix4(netdissect_options *ndo,
570 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
571 {
572 struct in_addr addr;
573 u_int plen, plenbytes;
574
575 /* prefix length and label = 4 bytes */
576 ND_TCHECK_4(pptr);
577 ITEMCHECK(4);
578 plen = GET_U_1(pptr); /* get prefix length */
579
580 /* this is one of the weirdnesses of rfc3107
581 the label length (actually the label + COS bits)
582 is added to the prefix length;
583 we also do only read out just one label -
584 there is no real application for advertisement of
585 stacked labels in a single BGP message
586 */
587
588 if (24 > plen)
589 return -1;
590
591 plen-=24; /* adjust prefixlen - labellength */
592
593 if (32 < plen)
594 return -1;
595 itemlen -= 4;
596
597 memset(&addr, 0, sizeof(addr));
598 plenbytes = (plen + 7) / 8;
599 ND_TCHECK_LEN(pptr + 4, plenbytes);
600 ITEMCHECK(plenbytes);
601 memcpy(&addr, pptr + 4, plenbytes);
602 if (plen % 8) {
603 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
604 }
605 /* the label may get offsetted by 4 bits so lets shift it right */
606 nd_snprintf(buf, buflen, "%s/%u, label:%u %s",
607 ipaddr_string(ndo, (const u_char *)&addr),
608 plen,
609 GET_BE_U_3(pptr + 1)>>4,
610 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
611
612 return 4 + plenbytes;
613
614 trunc:
615 return -2;
616
617 badtlv:
618 return -3;
619 }
620
621 /*
622 * bgp_vpn_ip_print
623 *
624 * print an ipv4 or ipv6 address into a buffer dependend on address length.
625 */
626 static char *
627 bgp_vpn_ip_print(netdissect_options *ndo,
628 const u_char *pptr, u_int addr_length)
629 {
630
631 /* worst case string is s fully formatted v6 address */
632 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
633 char *pos = addr;
634
635 switch(addr_length) {
636 case (sizeof(nd_ipv4) << 3): /* 32 */
637 ND_TCHECK_LEN(pptr, sizeof(nd_ipv4));
638 nd_snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
639 break;
640 case (sizeof(nd_ipv6) << 3): /* 128 */
641 ND_TCHECK_LEN(pptr, sizeof(nd_ipv6));
642 nd_snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
643 break;
644 default:
645 nd_snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
646 break;
647 }
648 pos += strlen(pos);
649
650 trunc:
651 *(pos) = '\0';
652 return (addr);
653 }
654
655 /*
656 * bgp_vpn_sg_print
657 *
658 * print an multicast s,g entry into a buffer.
659 * the s,g entry is encoded like this.
660 *
661 * +-----------------------------------+
662 * | Multicast Source Length (1 octet) |
663 * +-----------------------------------+
664 * | Multicast Source (Variable) |
665 * +-----------------------------------+
666 * | Multicast Group Length (1 octet) |
667 * +-----------------------------------+
668 * | Multicast Group (Variable) |
669 * +-----------------------------------+
670 *
671 * return the number of bytes read from the wire.
672 */
673 static u_int
674 bgp_vpn_sg_print(netdissect_options *ndo,
675 const u_char *pptr, char *buf, u_int buflen)
676 {
677 uint8_t addr_length;
678 u_int total_length, offset;
679
680 total_length = 0;
681
682 /* Source address length, encoded in bits */
683 ND_TCHECK_1(pptr);
684 addr_length = GET_U_1(pptr);
685 pptr++;
686
687 /* Source address */
688 ND_TCHECK_LEN(pptr, (addr_length >> 3));
689 total_length += (addr_length >> 3) + 1;
690 offset = strlen(buf);
691 if (addr_length) {
692 nd_snprintf(buf + offset, buflen - offset, ", Source %s",
693 bgp_vpn_ip_print(ndo, pptr, addr_length));
694 pptr += (addr_length >> 3);
695 }
696
697 /* Group address length, encoded in bits */
698 ND_TCHECK_1(pptr);
699 addr_length = GET_U_1(pptr);
700 pptr++;
701
702 /* Group address */
703 ND_TCHECK_LEN(pptr, (addr_length >> 3));
704 total_length += (addr_length >> 3) + 1;
705 offset = strlen(buf);
706 if (addr_length) {
707 nd_snprintf(buf + offset, buflen - offset, ", Group %s",
708 bgp_vpn_ip_print(ndo, pptr, addr_length));
709 pptr += (addr_length >> 3);
710 }
711
712 trunc:
713 return (total_length);
714 }
715
716 /* Print an RFC 4364 Route Distinguisher */
717 const char *
718 bgp_vpn_rd_print(netdissect_options *ndo,
719 const u_char *pptr)
720 {
721 /* allocate space for the largest possible string */
722 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
723 char *pos = rd;
724
725 /* ok lets load the RD format */
726 switch (GET_BE_U_2(pptr)) {
727
728 case 0:
729 /* 2-byte-AS:number fmt */
730 nd_snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
731 GET_BE_U_2(pptr + 2),
732 GET_BE_U_4(pptr + 4),
733 GET_U_1(pptr + 4), GET_U_1(pptr + 5),
734 GET_U_1(pptr + 6), GET_U_1(pptr + 7));
735 break;
736
737 case 1:
738 /* IP-address:AS fmt */
739 nd_snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
740 GET_U_1(pptr + 2), GET_U_1(pptr + 3),
741 GET_U_1(pptr + 4), GET_U_1(pptr + 5),
742 GET_BE_U_2(pptr + 6));
743 break;
744
745 case 2:
746 /* 4-byte-AS:number fmt */
747 nd_snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
748 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 2)),
749 GET_BE_U_2(pptr + 6), GET_U_1(pptr + 2),
750 GET_U_1(pptr + 3), GET_U_1(pptr + 4),
751 GET_U_1(pptr + 5), GET_BE_U_2(pptr + 6));
752 break;
753 default:
754 nd_snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
755 break;
756 }
757 pos += strlen(pos);
758 *(pos) = '\0';
759 return (rd);
760 }
761
762 /*
763 * Print an RFC 4360 Extended Community.
764 */
765 static void
766 bgp_extended_community_print(netdissect_options *ndo,
767 const u_char *pptr)
768 {
769 union { /* copy buffer for bandwidth values */
770 float f;
771 uint32_t i;
772 } bw;
773
774 switch (GET_BE_U_2(pptr)) {
775
776 case BGP_EXT_COM_RT_0:
777 case BGP_EXT_COM_RO_0:
778 case BGP_EXT_COM_L2VPN_RT_0:
779 ND_PRINT("%u:%u (= %s)",
780 GET_BE_U_2(pptr + 2),
781 GET_BE_U_4(pptr + 4),
782 ipaddr_string(ndo, pptr+4));
783 break;
784
785 case BGP_EXT_COM_RT_1:
786 case BGP_EXT_COM_RO_1:
787 case BGP_EXT_COM_L2VPN_RT_1:
788 case BGP_EXT_COM_VRF_RT_IMP:
789 ND_PRINT("%s:%u",
790 ipaddr_string(ndo, pptr+2),
791 GET_BE_U_2(pptr + 6));
792 break;
793
794 case BGP_EXT_COM_RT_2:
795 case BGP_EXT_COM_RO_2:
796 ND_PRINT("%s:%u",
797 as_printf(ndo, astostr, sizeof(astostr),
798 GET_BE_U_4(pptr + 2)), GET_BE_U_2(pptr + 6));
799 break;
800
801 case BGP_EXT_COM_LINKBAND:
802 bw.i = GET_BE_U_4(pptr + 2);
803 ND_PRINT("bandwidth: %.3f Mbps",
804 bw.f*8/1000000);
805 break;
806
807 case BGP_EXT_COM_VPN_ORIGIN:
808 case BGP_EXT_COM_VPN_ORIGIN2:
809 case BGP_EXT_COM_VPN_ORIGIN3:
810 case BGP_EXT_COM_VPN_ORIGIN4:
811 case BGP_EXT_COM_OSPF_RID:
812 case BGP_EXT_COM_OSPF_RID2:
813 ND_PRINT("%s", ipaddr_string(ndo, pptr+2));
814 break;
815
816 case BGP_EXT_COM_OSPF_RTYPE:
817 case BGP_EXT_COM_OSPF_RTYPE2:
818 ND_PRINT("area:%s, router-type:%s, metric-type:%s%s",
819 ipaddr_string(ndo, pptr+2),
820 tok2str(bgp_extd_comm_ospf_rtype_values,
821 "unknown (0x%02x)",
822 GET_U_1((pptr + 6))),
823 (GET_U_1(pptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
824 ((GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_EXT) || (GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "");
825 break;
826
827 case BGP_EXT_COM_L2INFO:
828 ND_PRINT("%s Control Flags [0x%02x]:MTU %u",
829 tok2str(l2vpn_encaps_values,
830 "unknown encaps",
831 GET_U_1((pptr + 2))),
832 GET_U_1((pptr + 3)),
833 GET_BE_U_2(pptr + 4));
834 break;
835
836 case BGP_EXT_COM_SOURCE_AS:
837 ND_PRINT("AS %u", GET_BE_U_2(pptr + 2));
838 break;
839
840 default:
841 ND_PRINT("%02x%02x%02x%02x%02x%02x",
842 GET_U_1(pptr + 2),
843 GET_U_1(pptr + 3),
844 GET_U_1(pptr + 4),
845 GET_U_1(pptr + 5),
846 GET_U_1(pptr + 6),
847 GET_U_1(pptr + 7));
848 break;
849 }
850 }
851
852 /* RFC 4684 */
853 static int
854 decode_rt_routing_info(netdissect_options *ndo,
855 const u_char *pptr)
856 {
857 u_int plen;
858 char asbuf[sizeof(astostr)]; /* bgp_vpn_rd_print() overwrites astostr */
859
860 /* NLRI "prefix length" from RFC 2858 Section 4. */
861 ND_TCHECK_1(pptr);
862 plen = GET_U_1(pptr); /* get prefix length */
863
864 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
865 * RFC 4684 Section 4 defines the layout of "origin AS" and "route
866 * target" fields inside the "prefix" depending on its length.
867 */
868 if (0 == plen) {
869 /* Without "origin AS", without "route target". */
870 ND_PRINT("\n\t default route target");
871 return 1;
872 }
873
874 if (32 > plen) {
875 ND_PRINT("\n\t (illegal prefix length)");
876 return -1;
877 }
878
879 /* With at least "origin AS", possibly with "route target". */
880 ND_TCHECK_4(pptr + 1);
881 as_printf(ndo, asbuf, sizeof(asbuf), GET_BE_U_4(pptr + 1));
882
883 plen -= 32; /* adjust prefix length */
884
885 /* An extended community is 8 octets, so the remaining prefix
886 * length must be 64.
887 */
888 if (64 != plen) {
889 ND_PRINT("\n\t (illegal prefix length)");
890 return -1;
891 }
892 ND_TCHECK_LEN(pptr + 5, 8);
893 ND_PRINT("\n\t origin AS: %s, route target ", asbuf);
894 bgp_extended_community_print(ndo, pptr + 5);
895
896 return 5 + 8;
897
898 trunc:
899 return -2;
900 }
901
902 static int
903 decode_labeled_vpn_prefix4(netdissect_options *ndo,
904 const u_char *pptr, char *buf, u_int buflen)
905 {
906 struct in_addr addr;
907 u_int plen;
908
909 ND_TCHECK_1(pptr);
910 plen = GET_U_1(pptr); /* get prefix length */
911
912 if ((24+64) > plen)
913 return -1;
914
915 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
916
917 if (32 < plen)
918 return -1;
919
920 memset(&addr, 0, sizeof(addr));
921 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
922 memcpy(&addr, pptr + 12, (plen + 7) / 8);
923 if (plen % 8) {
924 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
925 ((0xff00 >> (plen % 8)) & 0xff);
926 }
927 /* the label may get offsetted by 4 bits so lets shift it right */
928 nd_snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
929 bgp_vpn_rd_print(ndo, pptr+4),
930 ipaddr_string(ndo, (const u_char *)&addr),
931 plen,
932 GET_BE_U_3(pptr + 1)>>4,
933 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
934
935 return 12 + (plen + 7) / 8;
936
937 trunc:
938 return -2;
939 }
940
941 /*
942 * +-------------------------------+
943 * | |
944 * | RD:IPv4-address (12 octets) |
945 * | |
946 * +-------------------------------+
947 * | MDT Group-address (4 octets) |
948 * +-------------------------------+
949 */
950
951 #define MDT_VPN_NLRI_LEN 16
952
953 static int
954 decode_mdt_vpn_nlri(netdissect_options *ndo,
955 const u_char *pptr, char *buf, u_int buflen)
956 {
957 const u_char *rd;
958 const u_char *vpn_ip;
959
960 ND_TCHECK_1(pptr);
961
962 /* if the NLRI is not predefined length, quit.*/
963 if (GET_U_1(pptr) != MDT_VPN_NLRI_LEN * 8)
964 return -1;
965 pptr++;
966
967 /* RD */
968 ND_TCHECK_8(pptr);
969 rd = pptr;
970 pptr += 8;
971
972 /* IPv4 address */
973 ND_TCHECK_LEN(pptr, sizeof(nd_ipv4));
974 vpn_ip = pptr;
975 pptr += sizeof(nd_ipv4);
976
977 /* MDT Group Address */
978 ND_TCHECK_LEN(pptr, sizeof(nd_ipv4));
979
980 nd_snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
981 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
982
983 return MDT_VPN_NLRI_LEN + 1;
984
985 trunc:
986 return -2;
987 }
988
989 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
990 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
991 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
992 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
993 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
994 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
995 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
996
997 static const struct tok bgp_multicast_vpn_route_type_values[] = {
998 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
999 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
1000 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
1001 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
1002 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
1003 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
1004 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
1005 { 0, NULL}
1006 };
1007
1008 static int
1009 decode_multicast_vpn(netdissect_options *ndo,
1010 const u_char *pptr, char *buf, size_t buflen)
1011 {
1012 uint8_t route_type, route_length, addr_length;
1013 u_int sg_length;
1014 u_int offset;
1015
1016 ND_TCHECK_2(pptr);
1017 route_type = GET_U_1(pptr);
1018 pptr++;
1019 route_length = GET_U_1(pptr);
1020 pptr++;
1021
1022 nd_snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
1023 tok2str(bgp_multicast_vpn_route_type_values,
1024 "Unknown", route_type),
1025 route_type, route_length);
1026
1027 switch(route_type) {
1028 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
1029 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1030 offset = strlen(buf);
1031 nd_snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
1032 bgp_vpn_rd_print(ndo, pptr),
1033 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
1034 (route_length - BGP_VPN_RD_LEN) << 3));
1035 break;
1036 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
1037 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1038 offset = strlen(buf);
1039 nd_snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
1040 bgp_vpn_rd_print(ndo, pptr),
1041 as_printf(ndo, astostr, sizeof(astostr),
1042 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1043 break;
1044
1045 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
1046 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1047 offset = strlen(buf);
1048 nd_snprintf(buf + offset, buflen - offset, ", RD: %s",
1049 bgp_vpn_rd_print(ndo, pptr));
1050 pptr += BGP_VPN_RD_LEN;
1051
1052 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1053 addr_length = route_length - sg_length;
1054
1055 ND_TCHECK_LEN(pptr, addr_length);
1056 offset = strlen(buf);
1057 nd_snprintf(buf + offset, buflen - offset, ", Originator %s",
1058 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
1059 break;
1060
1061 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
1062 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1063 offset = strlen(buf);
1064 nd_snprintf(buf + offset, buflen - offset, ", RD: %s",
1065 bgp_vpn_rd_print(ndo, pptr));
1066 pptr += BGP_VPN_RD_LEN;
1067
1068 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1069 break;
1070
1071 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
1072 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
1073 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1074 offset = strlen(buf);
1075 nd_snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
1076 bgp_vpn_rd_print(ndo, pptr),
1077 as_printf(ndo, astostr, sizeof(astostr),
1078 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1079 pptr += BGP_VPN_RD_LEN + 4;
1080
1081 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1082 break;
1083
1084 /*
1085 * no per route-type printing yet.
1086 */
1087 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
1088 default:
1089 break;
1090 }
1091
1092 return route_length + 2;
1093
1094 trunc:
1095 return -2;
1096 }
1097
1098 /*
1099 * As I remember, some versions of systems have an snprintf() that
1100 * returns -1 if the buffer would have overflowed. If the return
1101 * value is negative, set buflen to 0, to indicate that we've filled
1102 * the buffer up.
1103 *
1104 * If the return value is greater than buflen, that means that
1105 * the buffer would have overflowed; again, set buflen to 0 in
1106 * that case.
1107 */
1108 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1109 if (stringlen<0) \
1110 buflen=0; \
1111 else if ((u_int)stringlen>buflen) \
1112 buflen=0; \
1113 else { \
1114 buflen-=stringlen; \
1115 buf+=stringlen; \
1116 }
1117
1118 static int
1119 decode_labeled_vpn_l2(netdissect_options *ndo,
1120 const u_char *pptr, char *buf, u_int buflen)
1121 {
1122 u_int plen, tlen, tlv_type, tlv_len, ttlv_len;
1123 int stringlen;
1124
1125 ND_TCHECK_2(pptr);
1126 plen = GET_BE_U_2(pptr);
1127 tlen = plen;
1128 pptr += 2;
1129 /* Old and new L2VPN NLRI share AFI/SAFI
1130 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1131 * and > 17 as old format. Complain for the middle case
1132 */
1133 if (plen == 12) {
1134 /* assume AD-only with RD, BGPNH */
1135 ND_TCHECK_LEN(pptr, 12);
1136 buf[0] = '\0';
1137 stringlen = nd_snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1138 bgp_vpn_rd_print(ndo, pptr),
1139 ipaddr_string(ndo, pptr+8));
1140 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1141 pptr += 12;
1142 tlen -= 12;
1143 return plen + 2;
1144 } else if (plen > 17) {
1145 /* assume old format */
1146 /* RD, ID, LBLKOFF, LBLBASE */
1147
1148 ND_TCHECK_LEN(pptr, 15);
1149 buf[0] = '\0';
1150 stringlen = nd_snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1151 bgp_vpn_rd_print(ndo, pptr),
1152 GET_BE_U_2(pptr + 8),
1153 GET_BE_U_2(pptr + 10),
1154 GET_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1155 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1156 pptr += 15;
1157 tlen -= 15;
1158
1159 /* ok now the variable part - lets read out TLVs*/
1160 while (tlen != 0) {
1161 if (tlen < 3) {
1162 if (buflen != 0) {
1163 stringlen=nd_snprintf(buf,buflen, "\n\t\tran past the end");
1164 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1165 }
1166 return plen + 2;
1167 }
1168 ND_TCHECK_3(pptr);
1169 tlv_type = GET_U_1(pptr);
1170 pptr++;
1171 tlv_len = GET_BE_U_2(pptr); /* length, in *bits* */
1172 ttlv_len = (tlv_len + 7)/8; /* length, in *bytes* */
1173 pptr += 2;
1174
1175 switch(tlv_type) {
1176 case 1:
1177 if (buflen != 0) {
1178 stringlen=nd_snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1179 tlv_type,
1180 tlv_len);
1181 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1182 }
1183 while (ttlv_len != 0) {
1184 if (tlen < 1) {
1185 if (buflen != 0) {
1186 stringlen=nd_snprintf(buf,buflen, " (ran past the end)");
1187 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1188 }
1189 return plen + 2;
1190 }
1191 ND_TCHECK_1(pptr);
1192 if (buflen != 0) {
1193 stringlen=nd_snprintf(buf,buflen, "%02x",
1194 GET_U_1(pptr));
1195 pptr++;
1196 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1197 }
1198 ttlv_len--;
1199 tlen--;
1200 }
1201 break;
1202 default:
1203 if (buflen != 0) {
1204 stringlen=nd_snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1205 tlv_type,
1206 tlv_len);
1207 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1208 }
1209 if (tlen < ttlv_len) {
1210 if (buflen != 0) {
1211 stringlen=nd_snprintf(buf,buflen, " (ran past the end)");
1212 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1213 }
1214 return plen + 2;
1215 }
1216 tlen -= ttlv_len;
1217 break;
1218 }
1219 }
1220 return plen + 2;
1221 } else {
1222 /* complain bitterly ? */
1223 /* fall through */
1224 goto trunc;
1225 }
1226
1227 trunc:
1228 return -2;
1229 }
1230
1231 int
1232 decode_prefix6(netdissect_options *ndo,
1233 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1234 {
1235 struct in6_addr addr;
1236 u_int plen, plenbytes;
1237
1238 ND_TCHECK_1(pd);
1239 ITEMCHECK(1);
1240 plen = GET_U_1(pd);
1241 if (128 < plen)
1242 return -1;
1243 itemlen -= 1;
1244
1245 memset(&addr, 0, sizeof(addr));
1246 plenbytes = (plen + 7) / 8;
1247 ND_TCHECK_LEN(pd + 1, plenbytes);
1248 ITEMCHECK(plenbytes);
1249 memcpy(&addr, pd + 1, plenbytes);
1250 if (plen % 8) {
1251 addr.s6_addr[plenbytes - 1] &=
1252 ((0xff00 >> (plen % 8)) & 0xff);
1253 }
1254 nd_snprintf(buf, buflen, "%s/%u", ip6addr_string(ndo, (const u_char *)&addr), plen);
1255 return 1 + plenbytes;
1256
1257 trunc:
1258 return -2;
1259
1260 badtlv:
1261 return -3;
1262 }
1263
1264 static int
1265 decode_labeled_prefix6(netdissect_options *ndo,
1266 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1267 {
1268 struct in6_addr addr;
1269 u_int plen, plenbytes;
1270
1271 /* prefix length and label = 4 bytes */
1272 ND_TCHECK_4(pptr);
1273 ITEMCHECK(4);
1274 plen = GET_U_1(pptr); /* get prefix length */
1275
1276 if (24 > plen)
1277 return -1;
1278
1279 plen -= 24; /* adjust prefixlen - labellength */
1280
1281 if (128 < plen)
1282 return -1;
1283 itemlen -= 4;
1284
1285 memset(&addr, 0, sizeof(addr));
1286 plenbytes = (plen + 7) / 8;
1287 ND_TCHECK_LEN(pptr + 4, plenbytes);
1288 memcpy(&addr, pptr + 4, plenbytes);
1289 if (plen % 8) {
1290 addr.s6_addr[plenbytes - 1] &=
1291 ((0xff00 >> (plen % 8)) & 0xff);
1292 }
1293 /* the label may get offsetted by 4 bits so lets shift it right */
1294 nd_snprintf(buf, buflen, "%s/%u, label:%u %s",
1295 ip6addr_string(ndo, (const u_char *)&addr),
1296 plen,
1297 GET_BE_U_3(pptr + 1)>>4,
1298 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1299
1300 return 4 + plenbytes;
1301
1302 trunc:
1303 return -2;
1304
1305 badtlv:
1306 return -3;
1307 }
1308
1309 static int
1310 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1311 const u_char *pptr, char *buf, u_int buflen)
1312 {
1313 struct in6_addr addr;
1314 u_int plen;
1315
1316 ND_TCHECK_1(pptr);
1317 plen = GET_U_1(pptr); /* get prefix length */
1318
1319 if ((24+64) > plen)
1320 return -1;
1321
1322 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1323
1324 if (128 < plen)
1325 return -1;
1326
1327 memset(&addr, 0, sizeof(addr));
1328 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1329 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1330 if (plen % 8) {
1331 addr.s6_addr[(plen + 7) / 8 - 1] &=
1332 ((0xff00 >> (plen % 8)) & 0xff);
1333 }
1334 /* the label may get offsetted by 4 bits so lets shift it right */
1335 nd_snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1336 bgp_vpn_rd_print(ndo, pptr+4),
1337 ip6addr_string(ndo, (const u_char *)&addr),
1338 plen,
1339 GET_BE_U_3(pptr + 1)>>4,
1340 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1341
1342 return 12 + (plen + 7) / 8;
1343
1344 trunc:
1345 return -2;
1346 }
1347
1348 static int
1349 decode_clnp_prefix(netdissect_options *ndo,
1350 const u_char *pptr, char *buf, u_int buflen)
1351 {
1352 uint8_t addr[19];
1353 u_int plen;
1354
1355 ND_TCHECK_1(pptr);
1356 plen = GET_U_1(pptr); /* get prefix length */
1357
1358 if (152 < plen)
1359 return -1;
1360
1361 memset(&addr, 0, sizeof(addr));
1362 ND_TCHECK_LEN(pptr + 4, (plen + 7) / 8);
1363 memcpy(&addr, pptr + 4, (plen + 7) / 8);
1364 if (plen % 8) {
1365 addr[(plen + 7) / 8 - 1] &=
1366 ((0xff00 >> (plen % 8)) & 0xff);
1367 }
1368 nd_snprintf(buf, buflen, "%s/%u",
1369 isonsap_string(ndo, addr,(plen + 7) / 8),
1370 plen);
1371
1372 return 1 + (plen + 7) / 8;
1373
1374 trunc:
1375 return -2;
1376 }
1377
1378 static int
1379 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1380 const u_char *pptr, char *buf, u_int buflen)
1381 {
1382 uint8_t addr[19];
1383 u_int plen;
1384
1385 ND_TCHECK_1(pptr);
1386 plen = GET_U_1(pptr); /* get prefix length */
1387
1388 if ((24+64) > plen)
1389 return -1;
1390
1391 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1392
1393 if (152 < plen)
1394 return -1;
1395
1396 memset(&addr, 0, sizeof(addr));
1397 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1398 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1399 if (plen % 8) {
1400 addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
1401 }
1402 /* the label may get offsetted by 4 bits so lets shift it right */
1403 nd_snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1404 bgp_vpn_rd_print(ndo, pptr+4),
1405 isonsap_string(ndo, addr,(plen + 7) / 8),
1406 plen,
1407 GET_BE_U_3(pptr + 1)>>4,
1408 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1409
1410 return 12 + (plen + 7) / 8;
1411
1412 trunc:
1413 return -2;
1414 }
1415
1416 /*
1417 * bgp_attr_get_as_size
1418 *
1419 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1420 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1421 * support, exchange AS-Path with the same path-attribute type value 0x02.
1422 */
1423 static u_int
1424 bgp_attr_get_as_size(netdissect_options *ndo,
1425 uint8_t bgpa_type, const u_char *pptr, u_int len)
1426 {
1427 const u_char *tptr = pptr;
1428
1429 /*
1430 * If the path attribute is the optional AS4 path type, then we already
1431 * know, that ASs must be encoded in 4 byte format.
1432 */
1433 if (bgpa_type == BGPTYPE_AS4_PATH) {
1434 return 4;
1435 }
1436
1437 /*
1438 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1439 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1440 * each.
1441 */
1442 while (tptr < pptr + len) {
1443 ND_TCHECK_1(tptr);
1444
1445 /*
1446 * If we do not find a valid segment type, our guess might be wrong.
1447 */
1448 if (GET_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || GET_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
1449 goto trunc;
1450 }
1451 ND_TCHECK_1(tptr + 1);
1452 tptr += 2 + GET_U_1(tptr + 1) * 2;
1453 }
1454
1455 /*
1456 * If we correctly reached end of the AS path attribute data content,
1457 * then most likely ASs were indeed encoded as 2 bytes.
1458 */
1459 if (tptr == pptr + len) {
1460 return 2;
1461 }
1462
1463 trunc:
1464
1465 /*
1466 * We can come here, either we did not have enough data, or if we
1467 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1468 * so that calller can try to decode each AS as of 4 bytes. If indeed
1469 * there was not enough data, it will crib and end the parse anyways.
1470 */
1471 return 4;
1472 }
1473
1474 /*
1475 * The only way to know that a BGP UPDATE message is using add path is
1476 * by checking if the capability is in the OPEN message which we may have missed.
1477 * So this function checks if it is possible that the update could contain add path
1478 * and if so it checks that standard BGP doesn't make sense.
1479 */
1480 static int
1481 check_add_path(netdissect_options *ndo, const u_char *pptr, u_int length,
1482 u_int max_prefix_length)
1483 {
1484 u_int offset, prefix_length;
1485
1486 if (length < 5) {
1487 return 0;
1488 }
1489
1490 /*
1491 * Scan through the NLRI information under the assumpetion that
1492 * it doesn't have path IDs.
1493 */
1494 for (offset = 0; offset < length;) {
1495 offset += 4;
1496 if (!ND_TTEST_1(pptr + offset)) {
1497 /* We ran out of captured data; quit scanning. */
1498 break;
1499 }
1500 prefix_length = GET_U_1(pptr + offset);
1501 /*
1502 * Add 4 to cover the path id
1503 * and check the prefix length isn't greater than 32/128.
1504 */
1505 if (prefix_length > max_prefix_length) {
1506 return 0;
1507 }
1508 /* Add 1 for the prefix_length byte and prefix_length to cover the address */
1509 offset += 1 + ((prefix_length + 7) / 8);
1510 }
1511 /* check we haven't gone past the end of the section */
1512 if (offset > length) {
1513 return 0;
1514 }
1515
1516 /* check it's not standard BGP */
1517 for (offset = 0; offset < length; ) {
1518 if (!ND_TTEST_1(pptr + offset)) {
1519 /* We ran out of captured data; quit scanning. */
1520 break;
1521 }
1522 prefix_length = GET_U_1(pptr + offset);
1523 /*
1524 * If the prefix_length is zero (0.0.0.0/0)
1525 * and since it's not the only address (length >= 5)
1526 * then it is add-path
1527 */
1528 if (prefix_length < 1 || prefix_length > max_prefix_length) {
1529 return 1;
1530 }
1531 offset += 1 + ((prefix_length + 7) / 8);
1532 }
1533 if (offset > length) {
1534 return 1;
1535 }
1536
1537 /* assume not add-path by default */
1538 return 0;
1539 }
1540
1541 static int
1542 bgp_attr_print(netdissect_options *ndo,
1543 uint8_t atype, const u_char *pptr, u_int len)
1544 {
1545 u_int i;
1546 uint16_t af;
1547 uint8_t safi, snpa, nhlen;
1548 int advance;
1549 u_int tlen;
1550 const u_char *tptr;
1551 char buf[MAXHOSTNAMELEN + 100];
1552 u_int as_size;
1553 int add_path4, add_path6;
1554 u_int path_id = 0;
1555
1556 tptr = pptr;
1557 tlen = len;
1558
1559 switch (atype) {
1560 case BGPTYPE_ORIGIN:
1561 if (len != 1)
1562 ND_PRINT("invalid len");
1563 else {
1564 ND_TCHECK_1(tptr);
1565 ND_PRINT("%s", tok2str(bgp_origin_values,
1566 "Unknown Origin Typecode",
1567 GET_U_1(tptr)));
1568 }
1569 break;
1570
1571 /*
1572 * Process AS4 byte path and AS2 byte path attributes here.
1573 */
1574 case BGPTYPE_AS4_PATH:
1575 case BGPTYPE_AS_PATH:
1576 if (len % 2) {
1577 ND_PRINT("invalid len");
1578 break;
1579 }
1580 if (!len) {
1581 ND_PRINT("empty");
1582 break;
1583 }
1584
1585 /*
1586 * BGP updates exchanged between New speakers that support 4
1587 * byte AS, ASs are always encoded in 4 bytes. There is no
1588 * definitive way to find this, just by the packet's
1589 * contents. So, check for packet's TLV's sanity assuming
1590 * 2 bytes first, and it does not pass, assume that ASs are
1591 * encoded in 4 bytes format and move on.
1592 */
1593 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1594
1595 while (tptr < pptr + len) {
1596 ND_TCHECK_1(tptr);
1597 ND_PRINT("%s", tok2str(bgp_as_path_segment_open_values,
1598 "?", GET_U_1(tptr)));
1599 ND_TCHECK_1(tptr + 1);
1600 for (i = 0; i < GET_U_1(tptr + 1) * as_size; i += as_size) {
1601 ND_TCHECK_LEN(tptr + 2 + i, as_size);
1602 ND_PRINT("%s ",
1603 as_printf(ndo, astostr, sizeof(astostr),
1604 as_size == 2 ?
1605 GET_BE_U_2(tptr + i + 2) :
1606 GET_BE_U_4(tptr + i + 2)));
1607 }
1608 ND_TCHECK_1(tptr);
1609 ND_PRINT("%s", tok2str(bgp_as_path_segment_close_values,
1610 "?", GET_U_1(tptr)));
1611 ND_TCHECK_1(tptr + 1);
1612 tptr += 2 + GET_U_1(tptr + 1) * as_size;
1613 }
1614 break;
1615 case BGPTYPE_NEXT_HOP:
1616 if (len != 4)
1617 ND_PRINT("invalid len");
1618 else {
1619 ND_TCHECK_4(tptr);
1620 ND_PRINT("%s", ipaddr_string(ndo, tptr));
1621 }
1622 break;
1623 case BGPTYPE_MULTI_EXIT_DISC:
1624 case BGPTYPE_LOCAL_PREF:
1625 if (len != 4)
1626 ND_PRINT("invalid len");
1627 else {
1628 ND_TCHECK_4(tptr);
1629 ND_PRINT("%u", GET_BE_U_4(tptr));
1630 }
1631 break;
1632 case BGPTYPE_ATOMIC_AGGREGATE:
1633 if (len != 0)
1634 ND_PRINT("invalid len");
1635 break;
1636 case BGPTYPE_AGGREGATOR:
1637
1638 /*
1639 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1640 * the length of this PA can be either 6 bytes or 8 bytes.
1641 */
1642 if (len != 6 && len != 8) {
1643 ND_PRINT("invalid len");
1644 break;
1645 }
1646 ND_TCHECK_LEN(tptr, len);
1647 if (len == 6) {
1648 ND_PRINT(" AS #%s, origin %s",
1649 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(tptr)),
1650 ipaddr_string(ndo, tptr + 2));
1651 } else {
1652 ND_PRINT(" AS #%s, origin %s",
1653 as_printf(ndo, astostr, sizeof(astostr),
1654 GET_BE_U_4(tptr)), ipaddr_string(ndo, tptr + 4));
1655 }
1656 break;
1657 case BGPTYPE_AGGREGATOR4:
1658 if (len != 8) {
1659 ND_PRINT("invalid len");
1660 break;
1661 }
1662 ND_TCHECK_8(tptr);
1663 ND_PRINT(" AS #%s, origin %s",
1664 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)),
1665 ipaddr_string(ndo, tptr + 4));
1666 break;
1667 case BGPTYPE_COMMUNITIES:
1668 if (len % 4) {
1669 ND_PRINT("invalid len");
1670 break;
1671 }
1672 while (tlen != 0) {
1673 uint32_t comm;
1674 ND_TCHECK_4(tptr);
1675 if (tlen < 4)
1676 goto trunc;
1677 comm = GET_BE_U_4(tptr);
1678 switch (comm) {
1679 case BGP_COMMUNITY_NO_EXPORT:
1680 ND_PRINT(" NO_EXPORT");
1681 break;
1682 case BGP_COMMUNITY_NO_ADVERT:
1683 ND_PRINT(" NO_ADVERTISE");
1684 break;
1685 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1686 ND_PRINT(" NO_EXPORT_SUBCONFED");
1687 break;
1688 default:
1689 ND_PRINT("%u:%u%s",
1690 (comm >> 16) & 0xffff,
1691 comm & 0xffff,
1692 (tlen>4) ? ", " : "");
1693 break;
1694 }
1695 tlen -=4;
1696 tptr +=4;
1697 }
1698 break;
1699 case BGPTYPE_ORIGINATOR_ID:
1700 if (len != 4) {
1701 ND_PRINT("invalid len");
1702 break;
1703 }
1704 ND_TCHECK_4(tptr);
1705 ND_PRINT("%s",ipaddr_string(ndo, tptr));
1706 break;
1707 case BGPTYPE_CLUSTER_LIST:
1708 if (len % 4) {
1709 ND_PRINT("invalid len");
1710 break;
1711 }
1712 while (tlen != 0) {
1713 ND_TCHECK_4(tptr);
1714 if (tlen < 4)
1715 goto trunc;
1716 ND_PRINT("%s%s",
1717 ipaddr_string(ndo, tptr),
1718 (tlen>4) ? ", " : "");
1719 tlen -=4;
1720 tptr +=4;
1721 }
1722 break;
1723 case BGPTYPE_MP_REACH_NLRI:
1724 ND_TCHECK_3(tptr);
1725 if (tlen < 3)
1726 goto trunc;
1727 af = GET_BE_U_2(tptr);
1728 safi = GET_U_1(tptr + 2);
1729
1730 ND_PRINT("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1731 tok2str(af_values, "Unknown AFI", af),
1732 af,
1733 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1734 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1735 safi);
1736
1737 switch(af<<8 | safi) {
1738 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1739 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1740 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1741 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1742 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1743 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1744 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1745 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1746 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1747 case (AFNUM_INET<<8 | SAFNUM_MDT):
1748 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1749 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1750 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1751 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1752 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1753 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1754 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1755 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1756 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1757 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1758 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1759 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1760 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1761 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1762 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1763 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1764 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1765 break;
1766 default:
1767 ND_TCHECK_LEN(tptr, tlen);
1768 ND_PRINT("\n\t no AFI %u / SAFI %u decoder", af, safi);
1769 if (ndo->ndo_vflag <= 1)
1770 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1771 goto done;
1772 break;
1773 }
1774
1775 tptr +=3;
1776
1777 ND_TCHECK_1(tptr);
1778 nhlen = GET_U_1(tptr);
1779 tlen = nhlen;
1780 tptr++;
1781
1782 if (tlen) {
1783 u_int nnh = 0;
1784 ND_PRINT("\n\t nexthop: ");
1785 while (tlen != 0) {
1786 if (nnh++ > 0) {
1787 ND_PRINT(", " );
1788 }
1789 switch(af<<8 | safi) {
1790 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1791 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1792 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1793 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1794 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1795 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1796 case (AFNUM_INET<<8 | SAFNUM_MDT):
1797 if (tlen < sizeof(nd_ipv4)) {
1798 ND_PRINT("invalid len");
1799 tlen = 0;
1800 } else {
1801 ND_TCHECK_LEN(tptr, sizeof(nd_ipv4));
1802 ND_PRINT("%s",ipaddr_string(ndo, tptr));
1803 tlen -= sizeof(nd_ipv4);
1804 tptr += sizeof(nd_ipv4);
1805 }
1806 break;
1807 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1808 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1809 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1810 if (tlen < sizeof(nd_ipv4)+BGP_VPN_RD_LEN) {
1811 ND_PRINT("invalid len");
1812 tlen = 0;
1813 } else {
1814 ND_TCHECK_LEN(tptr,
1815 sizeof(nd_ipv4) + BGP_VPN_RD_LEN);
1816 ND_PRINT("RD: %s, %s",
1817 bgp_vpn_rd_print(ndo, tptr),
1818 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN));
1819 tlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
1820 tptr += (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
1821 }
1822 break;
1823 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1824 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1825 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1826 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1827 if (tlen < sizeof(nd_ipv6)) {
1828 ND_PRINT("invalid len");
1829 tlen = 0;
1830 } else {
1831 ND_TCHECK_LEN(tptr, sizeof(nd_ipv6));
1832 ND_PRINT("%s", ip6addr_string(ndo, tptr));
1833 tlen -= sizeof(nd_ipv6);
1834 tptr += sizeof(nd_ipv6);
1835 }
1836 break;
1837 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1838 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1839 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1840 if (tlen < sizeof(nd_ipv6)+BGP_VPN_RD_LEN) {
1841 ND_PRINT("invalid len");
1842 tlen = 0;
1843 } else {
1844 ND_TCHECK_LEN(tptr,
1845 sizeof(nd_ipv6) + BGP_VPN_RD_LEN);
1846 ND_PRINT("RD: %s, %s",
1847 bgp_vpn_rd_print(ndo, tptr),
1848 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN));
1849 tlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
1850 tptr += (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
1851 }
1852 break;
1853 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1854 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1855 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1856 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1857 if (tlen < sizeof(nd_ipv4)) {
1858 ND_PRINT("invalid len");
1859 tlen = 0;
1860 } else {
1861 ND_TCHECK_LEN(tptr, sizeof(nd_ipv4));
1862 ND_PRINT("%s", ipaddr_string(ndo, tptr));
1863 tlen -= (sizeof(nd_ipv4));
1864 tptr += (sizeof(nd_ipv4));
1865 }
1866 break;
1867 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1868 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1869 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1870 ND_TCHECK_LEN(tptr, tlen);
1871 ND_PRINT("%s", isonsap_string(ndo, tptr, tlen));
1872 tptr += tlen;
1873 tlen = 0;
1874 break;
1875
1876 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1877 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1878 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1879 if (tlen < BGP_VPN_RD_LEN+1) {
1880 ND_PRINT("invalid len");
1881 tlen = 0;
1882 } else {
1883 ND_TCHECK_LEN(tptr, tlen);
1884 ND_PRINT("RD: %s, %s",
1885 bgp_vpn_rd_print(ndo, tptr),
1886 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN));
1887 /* rfc986 mapped IPv4 address ? */
1888 if (GET_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
1889 ND_PRINT(" = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4));
1890 /* rfc1888 mapped IPv6 address ? */
1891 else if (GET_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
1892 ND_PRINT(" = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3));
1893 tptr += tlen;
1894 tlen = 0;
1895 }
1896 break;
1897 default:
1898 ND_TCHECK_LEN(tptr, tlen);
1899 ND_PRINT("no AFI %u/SAFI %u decoder", af, safi);
1900 if (ndo->ndo_vflag <= 1)
1901 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1902 tptr += tlen;
1903 tlen = 0;
1904 goto done;
1905 break;
1906 }
1907 }
1908 }
1909 ND_PRINT(", nh-length: %u", nhlen);
1910 tptr += tlen;
1911
1912 ND_TCHECK_1(tptr);
1913 snpa = GET_U_1(tptr);
1914 tptr++;
1915
1916 if (snpa) {
1917 ND_PRINT("\n\t %u SNPA", snpa);
1918 for (/*nothing*/; snpa != 0; snpa--) {
1919 ND_TCHECK_1(tptr);
1920 ND_PRINT("\n\t %u bytes", GET_U_1(tptr));
1921 tptr += GET_U_1(tptr) + 1;
1922 }
1923 } else {
1924 ND_PRINT(", no SNPA");
1925 }
1926
1927 add_path4 = check_add_path(ndo, tptr, (len-(tptr - pptr)), 32);
1928 add_path6 = check_add_path(ndo, tptr, (len-(tptr - pptr)), 128);
1929
1930 while (tptr < pptr + len) {
1931 switch (af<<8 | safi) {
1932 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1933 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1934 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1935 if (add_path4) {
1936 path_id = GET_BE_U_4(tptr);
1937 tptr += 4;
1938 }
1939 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1940 if (advance == -1)
1941 ND_PRINT("\n\t (illegal prefix length)");
1942 else if (advance == -2)
1943 goto trunc;
1944 else if (advance == -3)
1945 break; /* bytes left, but not enough */
1946 else
1947 ND_PRINT("\n\t %s", buf);
1948 if (add_path4) {
1949 ND_PRINT(" Path Id: %u", path_id);
1950 }
1951 break;
1952 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1953 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1954 if (advance == -1)
1955 ND_PRINT("\n\t (illegal prefix length)");
1956 else if (advance == -2)
1957 goto trunc;
1958 else if (advance == -3)
1959 break; /* bytes left, but not enough */
1960 else
1961 ND_PRINT("\n\t %s", buf);
1962 break;
1963 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1964 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1965 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1966 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1967 if (advance == -1)
1968 ND_PRINT("\n\t (illegal prefix length)");
1969 else if (advance == -2)
1970 goto trunc;
1971 else
1972 ND_PRINT("\n\t %s", buf);
1973 break;
1974 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1975 advance = decode_rt_routing_info(ndo, tptr);
1976 if (advance == -2)
1977 goto trunc;
1978 break;
1979 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1980 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1981 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1982 if (advance == -1)
1983 ND_PRINT("\n\t (illegal prefix length)");
1984 else if (advance == -2)
1985 goto trunc;
1986 else
1987 ND_PRINT("\n\t %s", buf);
1988 break;
1989
1990 case (AFNUM_INET<<8 | SAFNUM_MDT):
1991 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1992 if (advance == -1)
1993 ND_PRINT("\n\t (illegal prefix length)");
1994 else if (advance == -2)
1995 goto trunc;
1996 else
1997 ND_PRINT("\n\t %s", buf);
1998 break;
1999 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
2000 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
2001 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
2002 if (add_path6) {
2003 path_id = GET_BE_U_4(tptr);
2004 tptr += 4;
2005 }
2006 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
2007 if (advance == -1)
2008 ND_PRINT("\n\t (illegal prefix length)");
2009 else if (advance == -2)
2010 goto trunc;
2011 else if (advance == -3)
2012 break; /* bytes left, but not enough */
2013 else
2014 ND_PRINT("\n\t %s", buf);
2015 if (add_path6) {
2016 ND_PRINT(" Path Id: %u", path_id);
2017 }
2018 break;
2019 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
2020 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
2021 if (advance == -1)
2022 ND_PRINT("\n\t (illegal prefix length)");
2023 else if (advance == -2)
2024 goto trunc;
2025 else if (advance == -3)
2026 break; /* bytes left, but not enough */
2027 else
2028 ND_PRINT("\n\t %s", buf);
2029 break;
2030 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
2031 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
2032 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
2033 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
2034 if (advance == -1)
2035 ND_PRINT("\n\t (illegal prefix length)");
2036 else if (advance == -2)
2037 goto trunc;
2038 else
2039 ND_PRINT("\n\t %s", buf);
2040 break;
2041 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
2042 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2043 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2044 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2045 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
2046 if (advance == -1)
2047 ND_PRINT("\n\t (illegal length)");
2048 else if (advance == -2)
2049 goto trunc;
2050 else
2051 ND_PRINT("\n\t %s", buf);
2052 break;
2053 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2054 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2055 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2056 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2057 if (advance == -1)
2058 ND_PRINT("\n\t (illegal prefix length)");
2059 else if (advance == -2)
2060 goto trunc;
2061 else
2062 ND_PRINT("\n\t %s", buf);
2063 break;
2064 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2065 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2066 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2067 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2068 if (advance == -1)
2069 ND_PRINT("\n\t (illegal prefix length)");
2070 else if (advance == -2)
2071 goto trunc;
2072 else
2073 ND_PRINT("\n\t %s", buf);
2074 break;
2075 default:
2076 ND_TCHECK_LEN(tptr, tlen);
2077 ND_PRINT("\n\t no AFI %u / SAFI %u decoder", af, safi);
2078 if (ndo->ndo_vflag <= 1)
2079 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2080 advance = 0;
2081 tptr = pptr + len;
2082 break;
2083 }
2084 if (advance < 0)
2085 break;
2086 tptr += advance;
2087 }
2088 done:
2089 break;
2090
2091 case BGPTYPE_MP_UNREACH_NLRI:
2092 ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
2093 af = GET_BE_U_2(tptr);
2094 safi = GET_U_1(tptr + 2);
2095
2096 ND_PRINT("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
2097 tok2str(af_values, "Unknown AFI", af),
2098 af,
2099 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
2100 tok2str(bgp_safi_values, "Unknown SAFI", safi),
2101 safi);
2102
2103 if (len == BGP_MP_NLRI_MINSIZE)
2104 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2105
2106 tptr += 3;
2107
2108 add_path4 = check_add_path(ndo, tptr, (len-(tptr - pptr)), 32);
2109 add_path6 = check_add_path(ndo, tptr, (len-(tptr - pptr)), 128);
2110
2111 while (tptr < pptr + len) {
2112 switch (af<<8 | safi) {
2113 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
2114 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
2115 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
2116 if (add_path4) {
2117 path_id = GET_BE_U_4(tptr);
2118 tptr += 4;
2119 }
2120 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
2121 if (advance == -1)
2122 ND_PRINT("\n\t (illegal prefix length)");
2123 else if (advance == -2)
2124 goto trunc;
2125 else if (advance == -3)
2126 break; /* bytes left, but not enough */
2127 else
2128 ND_PRINT("\n\t %s", buf);
2129 if (add_path4) {
2130 ND_PRINT(" Path Id: %u", path_id);
2131 }
2132 break;
2133 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
2134 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
2135 if (advance == -1)
2136 ND_PRINT("\n\t (illegal prefix length)");
2137 else if (advance == -2)
2138 goto trunc;
2139 else if (advance == -3)
2140 break; /* bytes left, but not enough */
2141 else
2142 ND_PRINT("\n\t %s", buf);
2143 break;
2144 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
2145 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
2146 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
2147 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
2148 if (advance == -1)
2149 ND_PRINT("\n\t (illegal prefix length)");
2150 else if (advance == -2)
2151 goto trunc;
2152 else
2153 ND_PRINT("\n\t %s", buf);
2154 break;
2155 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
2156 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
2157 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
2158 if (add_path6) {
2159 path_id = GET_BE_U_4(tptr);
2160 tptr += 4;
2161 }
2162 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
2163 if (advance == -1)
2164 ND_PRINT("\n\t (illegal prefix length)");
2165 else if (advance == -2)
2166 goto trunc;
2167 else if (advance == -3)
2168 break; /* bytes left, but not enough */
2169 else
2170 ND_PRINT("\n\t %s", buf);
2171 if (add_path6) {
2172 ND_PRINT(" Path Id: %u", path_id);
2173 }
2174 break;
2175 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
2176 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
2177 if (advance == -1)
2178 ND_PRINT("\n\t (illegal prefix length)");
2179 else if (advance == -2)
2180 goto trunc;
2181 else if (advance == -3)
2182 break; /* bytes left, but not enough */
2183 else
2184 ND_PRINT("\n\t %s", buf);
2185 break;
2186 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
2187 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
2188 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
2189 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
2190 if (advance == -1)
2191 ND_PRINT("\n\t (illegal prefix length)");
2192 else if (advance == -2)
2193 goto trunc;
2194 else
2195 ND_PRINT("\n\t %s", buf);
2196 break;
2197 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
2198 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2199 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2200 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2201 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
2202 if (advance == -1)
2203 ND_PRINT("\n\t (illegal length)");
2204 else if (advance == -2)
2205 goto trunc;
2206 else
2207 ND_PRINT("\n\t %s", buf);
2208 break;
2209 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2210 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2211 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2212 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2213 if (advance == -1)
2214 ND_PRINT("\n\t (illegal prefix length)");
2215 else if (advance == -2)
2216 goto trunc;
2217 else
2218 ND_PRINT("\n\t %s", buf);
2219 break;
2220 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2221 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2222 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2223 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2224 if (advance == -1)
2225 ND_PRINT("\n\t (illegal prefix length)");
2226 else if (advance == -2)
2227 goto trunc;
2228 else
2229 ND_PRINT("\n\t %s", buf);
2230 break;
2231 case (AFNUM_INET<<8 | SAFNUM_MDT):
2232 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
2233 if (advance == -1)
2234 ND_PRINT("\n\t (illegal prefix length)");
2235 else if (advance == -2)
2236 goto trunc;
2237 else
2238 ND_PRINT("\n\t %s", buf);
2239 break;
2240 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
2241 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
2242 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
2243 if (advance == -1)
2244 ND_PRINT("\n\t (illegal prefix length)");
2245 else if (advance == -2)
2246 goto trunc;
2247 else
2248 ND_PRINT("\n\t %s", buf);
2249 break;
2250 default:
2251 ND_TCHECK_LEN(tptr - 3, tlen);
2252 ND_PRINT("no AFI %u / SAFI %u decoder", af, safi);
2253 if (ndo->ndo_vflag <= 1)
2254 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
2255 advance = 0;
2256 tptr = pptr + len;
2257 break;
2258 }
2259 if (advance < 0)
2260 break;
2261 tptr += advance;
2262 }
2263 break;
2264 case BGPTYPE_EXTD_COMMUNITIES:
2265 if (len % 8) {
2266 ND_PRINT("invalid len");
2267 break;
2268 }
2269 while (tlen != 0) {
2270 uint16_t extd_comm;
2271
2272 ND_TCHECK_2(tptr);
2273 if (tlen < 2)
2274 goto trunc;
2275 extd_comm=GET_BE_U_2(tptr);
2276
2277 ND_PRINT("\n\t %s (0x%04x), Flags [%s]",
2278 tok2str(bgp_extd_comm_subtype_values,
2279 "unknown extd community typecode",
2280 extd_comm),
2281 extd_comm,
2282 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm));
2283
2284 ND_TCHECK_8(tptr);
2285 if (tlen < 8)
2286 goto trunc;
2287 ND_PRINT(": ");
2288 bgp_extended_community_print(ndo, tptr);
2289 tlen -= 8;
2290 tptr += 8;
2291 }
2292 break;
2293
2294 case BGPTYPE_PMSI_TUNNEL:
2295 {
2296 uint8_t tunnel_type, flags;
2297
2298 ND_TCHECK_5(tptr);
2299 if (tlen < 5)
2300 goto trunc;
2301 flags = GET_U_1(tptr);
2302 tunnel_type = GET_U_1(tptr + 1);
2303 tlen = len;
2304
2305 ND_PRINT("\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2306 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2307 tunnel_type,
2308 bittok2str(bgp_pmsi_flag_values, "none", flags),
2309 GET_BE_U_3(tptr + 2)>>4);
2310
2311 tptr +=5;
2312 tlen -= 5;
2313
2314 switch (tunnel_type) {
2315 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2316 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2317 ND_TCHECK_8(tptr);
2318 ND_PRINT("\n\t Sender %s, P-Group %s",
2319 ipaddr_string(ndo, tptr),
2320 ipaddr_string(ndo, tptr+4));
2321 break;
2322
2323 case BGP_PMSI_TUNNEL_PIM_SSM:
2324 ND_TCHECK_8(tptr);
2325 ND_PRINT("\n\t Root-Node %s, P-Group %s",
2326 ipaddr_string(ndo, tptr),
2327 ipaddr_string(ndo, tptr+4));
2328 break;
2329 case BGP_PMSI_TUNNEL_INGRESS:
2330 ND_TCHECK_4(tptr);
2331 ND_PRINT("\n\t Tunnel-Endpoint %s",
2332 ipaddr_string(ndo, tptr));
2333 break;
2334 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2335 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2336 ND_TCHECK_8(tptr);
2337 ND_PRINT("\n\t Root-Node %s, LSP-ID 0x%08x",
2338 ipaddr_string(ndo, tptr),
2339 GET_BE_U_4(tptr + 4));
2340 break;
2341 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2342 ND_TCHECK_8(tptr);
2343 ND_PRINT("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2344 ipaddr_string(ndo, tptr),
2345 GET_BE_U_4(tptr + 4));
2346 break;
2347 default:
2348 if (ndo->ndo_vflag <= 1) {
2349 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2350 }
2351 }
2352 break;
2353 }
2354 case BGPTYPE_AIGP:
2355 {
2356 uint8_t type;
2357 uint16_t length;
2358
2359 tlen = len;
2360
2361 while (tlen >= 3) {
2362
2363 ND_TCHECK_3(tptr);
2364
2365 type = GET_U_1(tptr);
2366 length = GET_BE_U_2(tptr + 1);
2367 tptr += 3;
2368 tlen -= 3;
2369
2370 ND_PRINT("\n\t %s TLV (%u), length %u",
2371 tok2str(bgp_aigp_values, "Unknown", type),
2372 type, length);
2373
2374 if (length < 3)
2375 goto trunc;
2376 length -= 3;
2377
2378 /*
2379 * Check if we can read the TLV data.
2380 */
2381 ND_TCHECK_LEN(tptr + 3, length);
2382 if (tlen < length)
2383 goto trunc;
2384
2385 switch (type) {
2386
2387 case BGP_AIGP_TLV:
2388 if (length < 8)
2389 goto trunc;
2390 ND_PRINT(", metric %" PRIu64,
2391 GET_BE_U_8(tptr));
2392 break;
2393
2394 default:
2395 if (ndo->ndo_vflag <= 1) {
2396 print_unknown_data(ndo, tptr,"\n\t ", length);
2397 }
2398 }
2399
2400 tptr += length;
2401 tlen -= length;
2402 }
2403 break;
2404 }
2405 case BGPTYPE_ATTR_SET:
2406 ND_TCHECK_4(tptr);
2407 if (len < 4)
2408 goto trunc;
2409 ND_PRINT("\n\t Origin AS: %s",
2410 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)));
2411 tptr += 4;
2412 len -= 4;
2413
2414 while (len) {
2415 u_int aflags, alenlen, alen;
2416
2417 ND_TCHECK_2(tptr);
2418 if (len < 2) {
2419 ND_PRINT(" [path attr too short]");
2420 tptr += len;
2421 break;
2422 }
2423 aflags = GET_U_1(tptr);
2424 atype = GET_U_1(tptr + 1);
2425 tptr += 2;
2426 len -= 2;
2427 alenlen = bgp_attr_lenlen(aflags, tptr);
2428 ND_TCHECK_LEN(tptr, alenlen);
2429 if (len < alenlen) {
2430 ND_PRINT(" [path attr too short]");
2431 tptr += len;
2432 break;
2433 }
2434 alen = bgp_attr_len(aflags, tptr);
2435 tptr += alenlen;
2436 len -= alenlen;
2437
2438 ND_PRINT("\n\t %s (%u), length: %u",
2439 tok2str(bgp_attr_values,
2440 "Unknown Attribute", atype),
2441 atype,
2442 alen);
2443
2444 if (aflags) {
2445 ND_PRINT(", Flags [%s%s%s%s",
2446 aflags & 0x80 ? "O" : "",
2447 aflags & 0x40 ? "T" : "",
2448 aflags & 0x20 ? "P" : "",
2449 aflags & 0x10 ? "E" : "");
2450 if (aflags & 0xf)
2451 ND_PRINT("+%x", aflags & 0xf);
2452 ND_PRINT("]");
2453 }
2454 ND_PRINT(": ");
2455 if (len < alen) {
2456 ND_PRINT(" [path attr too short]");
2457 tptr += len;
2458 break;
2459 }
2460 /* FIXME check for recursion */
2461 if (!bgp_attr_print(ndo, atype, tptr, alen))
2462 return 0;
2463 tptr += alen;
2464 len -= alen;
2465 }
2466 break;
2467
2468 case BGPTYPE_LARGE_COMMUNITY:
2469 if (len == 0 || len % 12) {
2470 ND_PRINT("invalid len");
2471 break;
2472 }
2473 ND_PRINT("\n\t ");
2474 while (len != 0) {
2475 ND_TCHECK_LEN(tptr, 12);
2476 ND_PRINT("%u:%u:%u%s",
2477 GET_BE_U_4(tptr),
2478 GET_BE_U_4(tptr + 4),
2479 GET_BE_U_4(tptr + 8),
2480 (len > 12) ? ", " : "");
2481 tptr += 12;
2482 /*
2483 * len will always be a multiple of 12, as per the above,
2484 * so this will never underflow.
2485 */
2486 len -= 12;
2487 }
2488 break;
2489 default:
2490 ND_TCHECK_LEN(pptr, len);
2491 ND_PRINT("\n\t no Attribute %u decoder", atype); /* we have no decoder for the attribute */
2492 if (ndo->ndo_vflag <= 1)
2493 print_unknown_data(ndo, pptr, "\n\t ", len);
2494 break;
2495 }
2496 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2497 ND_TCHECK_LEN(pptr, len);
2498 print_unknown_data(ndo, pptr, "\n\t ", len);
2499 }
2500 return 1;
2501
2502 trunc:
2503 return 0;
2504 }
2505
2506 static void
2507 bgp_capabilities_print(netdissect_options *ndo,
2508 const u_char *opt, u_int caps_len)
2509 {
2510 u_int cap_type, cap_len, tcap_len, cap_offset;
2511 u_int i = 0;
2512
2513 while (i < caps_len) {
2514 ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
2515 cap_type=GET_U_1(opt + i);
2516 cap_len=GET_U_1(opt + i + 1);
2517 ND_PRINT("\n\t %s (%u), length: %u",
2518 tok2str(bgp_capcode_values, "Unknown", cap_type),
2519 cap_type,
2520 cap_len);
2521 ND_TCHECK_LEN(opt + 2 + i, cap_len);
2522 switch (cap_type) {
2523 case BGP_CAPCODE_MP:
2524 /* AFI (16 bits), Reserved (8 bits), SAFI (8 bits) */
2525 if (cap_len < 4) {
2526 ND_PRINT(" (too short, < 4)");
2527 return;
2528 }
2529 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u)",
2530 tok2str(af_values, "Unknown", GET_BE_U_2(opt + i + 2)),
2531 GET_BE_U_2(opt + i + 2),
2532 tok2str(bgp_safi_values, "Unknown", GET_U_1(opt + i + 5)),
2533 GET_U_1(opt + i + 5));
2534 break;
2535 case BGP_CAPCODE_RESTART:
2536 /* Restart Flags (4 bits), Restart Time in seconds (12 bits) */
2537 if (cap_len < 2) {
2538 ND_PRINT(" (too short, < 2)");
2539 return;
2540 }
2541 tcap_len=cap_len;
2542 ND_PRINT("\n\t\tRestart Flags: [%s], Restart Time %us",
2543 ((GET_U_1(opt + i + 2))&0x80) ? "R" : "none",
2544 GET_BE_U_2(opt + i + 2)&0xfff);
2545 tcap_len-=2;
2546 cap_offset=4;
2547 while(tcap_len>=4) {
2548 ND_PRINT("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2549 tok2str(af_values,"Unknown",
2550 GET_BE_U_2(opt + i + cap_offset)),
2551 GET_BE_U_2(opt + i + cap_offset),
2552 tok2str(bgp_safi_values,"Unknown",
2553 GET_U_1(opt + i + cap_offset + 2)),
2554 GET_U_1(opt + (i + cap_offset + 2)),
2555 ((GET_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" );
2556 tcap_len -= 4;
2557 cap_offset += 4;
2558 }
2559 break;
2560 case BGP_CAPCODE_RR:
2561 case BGP_CAPCODE_RR_CISCO:
2562 break;
2563 case BGP_CAPCODE_AS_NEW:
2564 /*
2565 * Extract the 4 byte AS number encoded.
2566 */
2567 if (cap_len < 4) {
2568 ND_PRINT(" (too short, < 4)");
2569 return;
2570 }
2571 ND_PRINT("\n\t\t 4 Byte AS %s",
2572 as_printf(ndo, astostr, sizeof(astostr),
2573 GET_BE_U_4(opt + i + 2)));
2574 break;
2575 case BGP_CAPCODE_ADD_PATH:
2576 if (cap_len == 0) {
2577 ND_PRINT(" (bogus)"); /* length */
2578 break;
2579 }
2580 tcap_len=cap_len;
2581 cap_offset=2;
2582 while (tcap_len != 0) {
2583 if (tcap_len < 4) {
2584 nd_print_invalid(ndo);
2585 break;
2586 }
2587 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2588 tok2str(af_values,"Unknown",GET_BE_U_2(opt + i + cap_offset)),
2589 GET_BE_U_2(opt + i + cap_offset),
2590 tok2str(bgp_safi_values,"Unknown",GET_U_1(opt + i + cap_offset + 2)),
2591 GET_U_1(opt + (i + cap_offset + 2)),
2592 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",GET_U_1(opt + i + cap_offset + 3))
2593 );
2594 tcap_len -= 4;
2595 cap_offset += 4;
2596 }
2597 break;
2598 default:
2599 ND_PRINT("\n\t\tno decoder for Capability %u",
2600 cap_type);
2601 if (ndo->ndo_vflag <= 1)
2602 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2603 cap_len);
2604 break;
2605 }
2606 if (ndo->ndo_vflag > 1 && cap_len != 0) {
2607 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2608 }
2609 i += BGP_CAP_HEADER_SIZE + cap_len;
2610 }
2611 return;
2612
2613 trunc:
2614 nd_print_trunc(ndo);
2615 }
2616
2617 static void
2618 bgp_open_print(netdissect_options *ndo,
2619 const u_char *dat, u_int length)
2620 {
2621 const struct bgp_open *bgp_open_header;
2622 u_int optslen;
2623 const struct bgp_opt *bgpopt;
2624 const u_char *opt;
2625 u_int i;
2626
2627 ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
2628 if (length < BGP_OPEN_SIZE)
2629 goto trunc;
2630
2631 bgp_open_header = (const struct bgp_open *)dat;
2632
2633 ND_PRINT("\n\t Version %u, ",
2634 GET_U_1(bgp_open_header->bgpo_version));
2635 ND_PRINT("my AS %s, ",
2636 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(bgp_open_header->bgpo_myas)));
2637 ND_PRINT("Holdtime %us, ",
2638 GET_BE_U_2(bgp_open_header->bgpo_holdtime));
2639 ND_PRINT("ID %s", ipaddr_string(ndo, bgp_open_header->bgpo_id));
2640 optslen = GET_U_1(bgp_open_header->bgpo_optlen);
2641 ND_PRINT("\n\t Optional parameters, length: %u", optslen);
2642
2643 opt = dat + BGP_OPEN_SIZE;
2644 length -= BGP_OPEN_SIZE;
2645
2646 i = 0;
2647 while (i < optslen) {
2648 uint8_t opt_type, opt_len;
2649
2650 ND_TCHECK_LEN(opt + i, BGP_OPT_SIZE);
2651 if (length < BGP_OPT_SIZE + i)
2652 goto trunc;
2653 bgpopt = (const struct bgp_opt *)(opt + i);
2654 opt_type = GET_U_1(bgpopt->bgpopt_type);
2655 opt_len = GET_U_1(bgpopt->bgpopt_len);
2656 if (BGP_OPT_SIZE + i + opt_len > optslen) {
2657 ND_PRINT("\n\t Option %u, length: %u, goes past the end of the options",
2658 opt_type, opt_len);
2659 break;
2660 }
2661
2662 ND_PRINT("\n\t Option %s (%u), length: %u",
2663 tok2str(bgp_opt_values,"Unknown",opt_type),
2664 opt_type,
2665 opt_len);
2666
2667 /* now let's decode the options we know*/
2668 switch(opt_type) {
2669
2670 case BGP_OPT_CAP:
2671 bgp_capabilities_print(ndo, opt + BGP_OPT_SIZE + i,
2672 opt_len);
2673 break;
2674
2675 case BGP_OPT_AUTH:
2676 default:
2677 ND_PRINT("\n\t no decoder for option %u",
2678 opt_type);
2679 break;
2680 }
2681 i += BGP_OPT_SIZE + opt_len;
2682 }
2683 return;
2684 trunc:
2685 nd_print_trunc(ndo);
2686 }
2687
2688 static void
2689 bgp_update_print(netdissect_options *ndo,
2690 const u_char *dat, u_int length)
2691 {
2692 const u_char *p;
2693 u_int withdrawn_routes_len;
2694 char buf[MAXHOSTNAMELEN + 100];
2695 int wpfx;
2696 u_int len;
2697 int i;
2698 int add_path;
2699 u_int path_id = 0;
2700
2701 ND_TCHECK_LEN(dat, BGP_SIZE);
2702 if (length < BGP_SIZE)
2703 goto trunc;
2704 p = dat + BGP_SIZE;
2705 length -= BGP_SIZE;
2706
2707 /* Unfeasible routes */
2708 ND_TCHECK_2(p);
2709 if (length < 2)
2710 goto trunc;
2711 withdrawn_routes_len = GET_BE_U_2(p);
2712 p += 2;
2713 length -= 2;
2714 if (withdrawn_routes_len > 1) {
2715 /*
2716 * Without keeping state from the original NLRI message,
2717 * it's not possible to tell if this a v4 or v6 route,
2718 * so only try to decode it if we're not v6 enabled.
2719 */
2720 ND_TCHECK_LEN(p, withdrawn_routes_len);
2721 if (length < withdrawn_routes_len)
2722 goto trunc;
2723 ND_PRINT("\n\t Withdrawn routes:");
2724 add_path = check_add_path(ndo, p, withdrawn_routes_len, 32);
2725 while (withdrawn_routes_len != 0) {
2726 if (add_path) {
2727 if (withdrawn_routes_len < 4) {
2728 p += withdrawn_routes_len;
2729 length -= withdrawn_routes_len;
2730 break;
2731 }
2732 path_id = GET_BE_U_4(p);
2733 p += 4;
2734 length -= 4;
2735 withdrawn_routes_len -= 4;
2736 }
2737 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
2738 if (wpfx == -1) {
2739 ND_PRINT("\n\t (illegal prefix length)");
2740 break;
2741 } else if (wpfx == -2)
2742 goto trunc;
2743 else if (wpfx == -3)
2744 goto trunc; /* bytes left, but not enough */
2745 else {
2746 ND_PRINT("\n\t %s", buf);
2747 if (add_path) {
2748 ND_PRINT(" Path Id: %u", path_id);
2749 }
2750 p += wpfx;
2751 length -= wpfx;
2752 withdrawn_routes_len -= wpfx;
2753 }
2754 }
2755 } else {
2756 ND_TCHECK_LEN(p, withdrawn_routes_len);
2757 if (length < withdrawn_routes_len)
2758 goto trunc;
2759 p += withdrawn_routes_len;
2760 length -= withdrawn_routes_len;
2761 }
2762
2763 ND_TCHECK_2(p);
2764 if (length < 2)
2765 goto trunc;
2766 len = GET_BE_U_2(p);
2767 p += 2;
2768 length -= 2;
2769
2770 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2771 /* No withdrawn routes, no path attributes, no NLRI */
2772 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2773 return;
2774 }
2775
2776 if (len) {
2777 /* do something more useful!*/
2778 while (len) {
2779 uint8_t aflags, atype, alenlen;
2780 uint16_t alen;
2781
2782 ND_TCHECK_2(p);
2783 if (length < 2)
2784 goto trunc;
2785 if (len < 2) {
2786 ND_PRINT("\n\t [path attrs too short]");
2787 p += len;
2788 length -= len;
2789 break;
2790 }
2791 aflags = GET_U_1(p);
2792 atype = GET_U_1(p + 1);
2793 p += 2;
2794 len -= 2;
2795 length -= 2;
2796 alenlen = bgp_attr_lenlen(aflags, p);
2797 ND_TCHECK_LEN(p, alenlen);
2798 if (length < alenlen)
2799 goto trunc;
2800 if (len < alenlen) {
2801 ND_PRINT("\n\t [path attrs too short]");
2802 p += len;
2803 length -= len;
2804 break;
2805 }
2806 alen = bgp_attr_len(aflags, p);
2807 p += alenlen;
2808 len -= alenlen;
2809 length -= alenlen;
2810
2811 ND_PRINT("\n\t %s (%u), length: %u",
2812 tok2str(bgp_attr_values, "Unknown Attribute", atype),
2813 atype,
2814 alen);
2815
2816 if (aflags) {
2817 ND_PRINT(", Flags [%s%s%s%s",
2818 aflags & 0x80 ? "O" : "",
2819 aflags & 0x40 ? "T" : "",
2820 aflags & 0x20 ? "P" : "",
2821 aflags & 0x10 ? "E" : "");
2822 if (aflags & 0xf)
2823 ND_PRINT("+%x", aflags & 0xf);
2824 ND_PRINT("]: ");
2825 }
2826 if (len < alen) {
2827 ND_PRINT(" [path attrs too short]");
2828 p += len;
2829 length -= len;
2830 break;
2831 }
2832 if (length < alen)
2833 goto trunc;
2834 if (!bgp_attr_print(ndo, atype, p, alen))
2835 goto trunc;
2836 p += alen;
2837 len -= alen;
2838 length -= alen;
2839 }
2840 }
2841
2842 if (length) {
2843 add_path = check_add_path(ndo, p, length, 32);
2844 ND_PRINT("\n\t Updated routes:");
2845 while (length != 0) {
2846 if (add_path) {
2847 ND_TCHECK_4(p);
2848 if (length < 4)
2849 goto trunc;
2850 path_id = GET_BE_U_4(p);
2851 p += 4;
2852 length -= 4;
2853 }
2854 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2855 if (i == -1) {
2856 ND_PRINT("\n\t (illegal prefix length)");
2857 break;
2858 } else if (i == -2)
2859 goto trunc;
2860 else if (i == -3)
2861 goto trunc; /* bytes left, but not enough */
2862 else {
2863 ND_PRINT("\n\t %s", buf);
2864 if (add_path) {
2865 ND_PRINT(" Path Id: %u", path_id);
2866 }
2867 p += i;
2868 length -= i;
2869 }
2870 }
2871 }
2872 return;
2873 trunc:
2874 nd_print_trunc(ndo);
2875 }
2876
2877 static void
2878 bgp_notification_print(netdissect_options *ndo,
2879 const u_char *dat, u_int length)
2880 {
2881 const struct bgp_notification *bgp_notification_header;
2882 const u_char *tptr;
2883 uint8_t bgpn_major, bgpn_minor;
2884 uint8_t shutdown_comm_length;
2885 uint8_t remainder_offset;
2886
2887 ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
2888 if (length<BGP_NOTIFICATION_SIZE)
2889 return;
2890
2891 bgp_notification_header = (const struct bgp_notification *)dat;
2892 bgpn_major = GET_U_1(bgp_notification_header->bgpn_major);
2893 bgpn_minor = GET_U_1(bgp_notification_header->bgpn_minor);
2894
2895 ND_PRINT(", %s (%u)",
2896 tok2str(bgp_notify_major_values, "Unknown Error",
2897 bgpn_major),
2898 bgpn_major);
2899
2900 switch (bgpn_major) {
2901
2902 case BGP_NOTIFY_MAJOR_MSG:
2903 ND_PRINT(", subcode %s (%u)",
2904 tok2str(bgp_notify_minor_msg_values, "Unknown",
2905 bgpn_minor),
2906 bgpn_minor);
2907 break;
2908 case BGP_NOTIFY_MAJOR_OPEN:
2909 ND_PRINT(", subcode %s (%u)",
2910 tok2str(bgp_notify_minor_open_values, "Unknown",
2911 bgpn_minor),
2912 bgpn_minor);
2913 break;
2914 case BGP_NOTIFY_MAJOR_UPDATE:
2915 ND_PRINT(", subcode %s (%u)",
2916 tok2str(bgp_notify_minor_update_values, "Unknown",
2917 bgpn_minor),
2918 bgpn_minor);
2919 break;
2920 case BGP_NOTIFY_MAJOR_FSM:
2921 ND_PRINT(" subcode %s (%u)",
2922 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2923 bgpn_minor),
2924 bgpn_minor);
2925 break;
2926 case BGP_NOTIFY_MAJOR_CAP:
2927 ND_PRINT(" subcode %s (%u)",
2928 tok2str(bgp_notify_minor_cap_values, "Unknown",
2929 bgpn_minor),
2930 bgpn_minor);
2931 break;
2932 case BGP_NOTIFY_MAJOR_CEASE:
2933 ND_PRINT(", subcode %s (%u)",
2934 tok2str(bgp_notify_minor_cease_values, "Unknown",
2935 bgpn_minor),
2936 bgpn_minor);
2937
2938 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2939 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2940 */
2941 if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2942 tptr = dat + BGP_NOTIFICATION_SIZE;
2943 ND_TCHECK_7(tptr);
2944 ND_PRINT(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2945 tok2str(af_values, "Unknown", GET_BE_U_2(tptr)),
2946 GET_BE_U_2(tptr),
2947 tok2str(bgp_safi_values, "Unknown", GET_U_1((tptr + 2))),
2948 GET_U_1((tptr + 2)),
2949 GET_BE_U_4(tptr + 3));
2950 }
2951 /*
2952 * draft-ietf-idr-shutdown describes a method to send a communication
2953 * intended for human consumption regarding the Administrative Shutdown
2954 */
2955 if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
2956 bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
2957 length >= BGP_NOTIFICATION_SIZE + 1) {
2958 tptr = dat + BGP_NOTIFICATION_SIZE;
2959 ND_TCHECK_1(tptr);
2960 shutdown_comm_length = GET_U_1(tptr);
2961 remainder_offset = 0;
2962 /* garbage, hexdump it all */
2963 if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN ||
2964 shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) {
2965 ND_PRINT(", invalid Shutdown Communication length");
2966 }
2967 else if (shutdown_comm_length == 0) {
2968 ND_PRINT(", empty Shutdown Communication");
2969 remainder_offset += 1;
2970 }
2971 /* a proper shutdown communication */
2972 else {
2973 ND_TCHECK_LEN(tptr + 1, shutdown_comm_length);
2974 ND_PRINT(", Shutdown Communication (length: %u): \"", shutdown_comm_length);
2975 (void)nd_printn(ndo, tptr+1, shutdown_comm_length, NULL);
2976 ND_PRINT("\"");
2977 remainder_offset += shutdown_comm_length + 1;
2978 }
2979 /* if there is trailing data, hexdump it */
2980 if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) {
2981 ND_PRINT(", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2982 hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2983 }
2984 }
2985 break;
2986 default:
2987 break;
2988 }
2989
2990 return;
2991 trunc:
2992 nd_print_trunc(ndo);
2993 }
2994
2995 static void
2996 bgp_route_refresh_print(netdissect_options *ndo,
2997 const u_char *pptr, u_int len)
2998 {
2999 const struct bgp_route_refresh *bgp_route_refresh_header;
3000
3001 ND_TCHECK_LEN(pptr, BGP_ROUTE_REFRESH_SIZE);
3002
3003 /* some little sanity checking */
3004 if (len<BGP_ROUTE_REFRESH_SIZE)
3005 return;
3006
3007 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
3008
3009 ND_PRINT("\n\t AFI %s (%u), SAFI %s (%u)",
3010 tok2str(af_values,"Unknown",
3011 GET_BE_U_2(bgp_route_refresh_header->afi)),
3012 GET_BE_U_2(bgp_route_refresh_header->afi),
3013 tok2str(bgp_safi_values,"Unknown",
3014 GET_U_1(bgp_route_refresh_header->safi)),
3015 GET_U_1(bgp_route_refresh_header->safi));
3016
3017 if (ndo->ndo_vflag > 1) {
3018 ND_TCHECK_LEN(pptr, len);
3019 print_unknown_data(ndo, pptr, "\n\t ", len);
3020 }
3021
3022 return;
3023 trunc:
3024 nd_print_trunc(ndo);
3025 }
3026
3027 static int
3028 bgp_pdu_print(netdissect_options *ndo,
3029 const u_char *dat, u_int length)
3030 {
3031 const struct bgp *bgp_header;
3032 uint8_t bgp_type;
3033
3034 ND_TCHECK_LEN(dat, BGP_SIZE);
3035 bgp_header = (const struct bgp *)dat;
3036 bgp_type = GET_U_1(bgp_header->bgp_type);
3037
3038 ND_PRINT("\n\t%s Message (%u), length: %u",
3039 tok2str(bgp_msg_values, "Unknown", bgp_type),
3040 bgp_type,
3041 length);
3042
3043 switch (bgp_type) {
3044 case BGP_OPEN:
3045 bgp_open_print(ndo, dat, length);
3046 break;
3047 case BGP_UPDATE:
3048 bgp_update_print(ndo, dat, length);
3049 break;
3050 case BGP_NOTIFICATION:
3051 bgp_notification_print(ndo, dat, length);
3052 break;
3053 case BGP_KEEPALIVE:
3054 break;
3055 case BGP_ROUTE_REFRESH:
3056 bgp_route_refresh_print(ndo, dat, length);
3057 break;
3058 default:
3059 /* we have no decoder for the BGP message */
3060 ND_TCHECK_LEN(dat, length);
3061 ND_PRINT("\n\t no Message %u decoder", bgp_type);
3062 print_unknown_data(ndo, dat, "\n\t ", length);
3063 break;
3064 }
3065 return 1;
3066 trunc:
3067 nd_print_trunc(ndo);
3068 return 0;
3069 }
3070
3071 void
3072 bgp_print(netdissect_options *ndo,
3073 const u_char *dat, u_int length _U_)
3074 {
3075 const u_char *p;
3076 const u_char *ep = ndo->ndo_snapend;
3077 const u_char *start;
3078 const u_char marker[] = {
3079 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3080 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
3081 };
3082 const struct bgp *bgp_header;
3083 uint16_t hlen;
3084
3085 ndo->ndo_protocol = "bgp";
3086 ND_PRINT(": BGP");
3087
3088 if (ndo->ndo_vflag < 1) /* lets be less chatty */
3089 return;
3090
3091 p = dat;
3092 start = p;
3093 while (p < ep) {
3094 if (!ND_TTEST_1(p))
3095 break;
3096 if (GET_U_1(p) != 0xff) {
3097 p++;
3098 continue;
3099 }
3100
3101 if (!ND_TTEST_LEN(p, sizeof(marker)))
3102 break;
3103 if (memcmp(p, marker, sizeof(marker)) != 0) {
3104 p++;
3105 continue;
3106 }
3107
3108 /* found BGP header */
3109 ND_TCHECK_LEN(p, BGP_SIZE);
3110 bgp_header = (const struct bgp *)p;
3111
3112 if (start != p)
3113 nd_print_trunc(ndo);
3114
3115 hlen = GET_BE_U_2(bgp_header->bgp_len);
3116 if (hlen < BGP_SIZE) {
3117 ND_PRINT("\nmessage length %u < %u", hlen, BGP_SIZE);
3118 nd_print_invalid(ndo);
3119 break;
3120 }
3121
3122 if (ND_TTEST_LEN(p, hlen)) {
3123 if (!bgp_pdu_print(ndo, p, hlen))
3124 return;
3125 p += hlen;
3126 start = p;
3127 } else {
3128 ND_PRINT("\n[|BGP %s]",
3129 tok2str(bgp_msg_values,
3130 "Unknown Message Type",
3131 GET_U_1(bgp_header->bgp_type)));
3132 break;
3133 }
3134 }
3135
3136 return;
3137
3138 trunc:
3139 nd_print_trunc(ndo);
3140 }
[mirror] the TCPdump network dissector