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More use of %zu to print sizeof values.
[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_ML 8 /* RFC8277 */
220 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */
221 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
222 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
223 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
224 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
225 #define BGP_CAPCODE_ENH_RR 70 /* draft-keyur-bgp-enhanced-route-refresh */
226 #define BGP_CAPCODE_RR_CISCO 128
227
228 static const struct tok bgp_capcode_values[] = {
229 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
230 { BGP_CAPCODE_RR, "Route Refresh"},
231 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
232 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
233 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
234 { BGP_CAPCODE_ML, "Multiple Labels"},
235 { BGP_CAPCODE_RESTART, "Graceful Restart"},
236 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
237 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
238 { BGP_CAPCODE_MULTISESS, "Multisession BGP"},
239 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
240 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
241 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
242 { 0, NULL}
243 };
244
245 #define BGP_NOTIFY_MAJOR_MSG 1
246 #define BGP_NOTIFY_MAJOR_OPEN 2
247 #define BGP_NOTIFY_MAJOR_UPDATE 3
248 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
249 #define BGP_NOTIFY_MAJOR_FSM 5
250 #define BGP_NOTIFY_MAJOR_CEASE 6
251 #define BGP_NOTIFY_MAJOR_CAP 7
252
253 static const struct tok bgp_notify_major_values[] = {
254 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
255 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
256 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
257 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
258 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
259 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
260 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"},
261 { 0, NULL}
262 };
263
264 /* draft-ietf-idr-cease-subcode-02 */
265 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
266 /* draft-ietf-idr-shutdown-07 */
267 #define BGP_NOTIFY_MINOR_CEASE_SHUT 2
268 #define BGP_NOTIFY_MINOR_CEASE_RESET 4
269 #define BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN 128
270 static const struct tok bgp_notify_minor_cease_values[] = {
271 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
272 { BGP_NOTIFY_MINOR_CEASE_SHUT, "Administrative Shutdown"},
273 { 3, "Peer Unconfigured"},
274 { BGP_NOTIFY_MINOR_CEASE_RESET, "Administrative Reset"},
275 { 5, "Connection Rejected"},
276 { 6, "Other Configuration Change"},
277 { 7, "Connection Collision Resolution"},
278 { 0, NULL}
279 };
280
281 static const struct tok bgp_notify_minor_msg_values[] = {
282 { 1, "Connection Not Synchronized"},
283 { 2, "Bad Message Length"},
284 { 3, "Bad Message Type"},
285 { 0, NULL}
286 };
287
288 static const struct tok bgp_notify_minor_open_values[] = {
289 { 1, "Unsupported Version Number"},
290 { 2, "Bad Peer AS"},
291 { 3, "Bad BGP Identifier"},
292 { 4, "Unsupported Optional Parameter"},
293 { 5, "Authentication Failure"},
294 { 6, "Unacceptable Hold Time"},
295 { 7, "Capability Message Error"},
296 { 0, NULL}
297 };
298
299 static const struct tok bgp_notify_minor_update_values[] = {
300 { 1, "Malformed Attribute List"},
301 { 2, "Unrecognized Well-known Attribute"},
302 { 3, "Missing Well-known Attribute"},
303 { 4, "Attribute Flags Error"},
304 { 5, "Attribute Length Error"},
305 { 6, "Invalid ORIGIN Attribute"},
306 { 7, "AS Routing Loop"},
307 { 8, "Invalid NEXT_HOP Attribute"},
308 { 9, "Optional Attribute Error"},
309 { 10, "Invalid Network Field"},
310 { 11, "Malformed AS_PATH"},
311 { 0, NULL}
312 };
313
314 static const struct tok bgp_notify_minor_fsm_values[] = {
315 { 0, "Unspecified Error"},
316 { 1, "In OpenSent State"},
317 { 2, "In OpenConfirm State"},
318 { 3, "In Established State"},
319 { 0, NULL }
320 };
321
322 static const struct tok bgp_notify_minor_cap_values[] = {
323 { 1, "Invalid Action Value" },
324 { 2, "Invalid Capability Length" },
325 { 3, "Malformed Capability Value" },
326 { 4, "Unsupported Capability Code" },
327 { 0, NULL }
328 };
329
330 static const struct tok bgp_origin_values[] = {
331 { 0, "IGP"},
332 { 1, "EGP"},
333 { 2, "Incomplete"},
334 { 0, NULL}
335 };
336
337 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1
338 #define BGP_PMSI_TUNNEL_LDP_P2MP 2
339 #define BGP_PMSI_TUNNEL_PIM_SSM 3
340 #define BGP_PMSI_TUNNEL_PIM_SM 4
341 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5
342 #define BGP_PMSI_TUNNEL_INGRESS 6
343 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7
344
345 static const struct tok bgp_pmsi_tunnel_values[] = {
346 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
347 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
348 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
349 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
350 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
351 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
352 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
353 { 0, NULL}
354 };
355
356 static const struct tok bgp_pmsi_flag_values[] = {
357 { 0x01, "Leaf Information required"},
358 { 0, NULL}
359 };
360
361 #define BGP_AIGP_TLV 1
362
363 static const struct tok bgp_aigp_values[] = {
364 { BGP_AIGP_TLV, "AIGP"},
365 { 0, NULL}
366 };
367
368 /* Subsequent address family identifier, RFC2283 section 7 */
369 #define SAFNUM_RES 0
370 #define SAFNUM_UNICAST 1
371 #define SAFNUM_MULTICAST 2
372 #define SAFNUM_UNIMULTICAST 3 /* deprecated now */
373 /* labeled BGP RFC3107 */
374 #define SAFNUM_LABUNICAST 4
375 /* RFC6514 */
376 #define SAFNUM_MULTICAST_VPN 5
377 /* draft-nalawade-kapoor-tunnel-safi */
378 #define SAFNUM_TUNNEL 64
379 /* RFC4761 */
380 #define SAFNUM_VPLS 65
381 /* RFC6037 */
382 #define SAFNUM_MDT 66
383 /* RFC4364 */
384 #define SAFNUM_VPNUNICAST 128
385 /* RFC6513 */
386 #define SAFNUM_VPNMULTICAST 129
387 #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */
388 /* RFC4684 */
389 #define SAFNUM_RT_ROUTING_INFO 132
390
391 #define BGP_VPN_RD_LEN 8
392
393 static const struct tok bgp_safi_values[] = {
394 { SAFNUM_RES, "Reserved"},
395 { SAFNUM_UNICAST, "Unicast"},
396 { SAFNUM_MULTICAST, "Multicast"},
397 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
398 { SAFNUM_LABUNICAST, "labeled Unicast"},
399 { SAFNUM_TUNNEL, "Tunnel"},
400 { SAFNUM_VPLS, "VPLS"},
401 { SAFNUM_MDT, "MDT"},
402 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
403 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
404 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
405 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
406 { SAFNUM_MULTICAST_VPN, "Multicast VPN"},
407 { 0, NULL }
408 };
409
410 /* well-known community */
411 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
412 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
413 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
414
415 /* Extended community type - RFC 4360 */
416 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
417 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
418 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
419 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
420 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
421 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
422 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
423 /* rfc2547 bgp-mpls-vpns */
424 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
425 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatibility */
426 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatibility */
427 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatibility */
428
429 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
430 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatibility */
431
432 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
433 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatibility */
434
435 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
436
437 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
438 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
439 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
440 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */
441
442 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */
443 #define BGP_EXT_COM_EIGRP_GEN 0x8800
444 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801
445 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
446 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803
447 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804
448 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
449
450 static const struct tok bgp_extd_comm_flag_values[] = {
451 { 0x8000, "vendor-specific"},
452 { 0x4000, "non-transitive"},
453 { 0, NULL},
454 };
455
456 static const struct tok bgp_extd_comm_subtype_values[] = {
457 { BGP_EXT_COM_RT_0, "target"},
458 { BGP_EXT_COM_RT_1, "target"},
459 { BGP_EXT_COM_RT_2, "target"},
460 { BGP_EXT_COM_RO_0, "origin"},
461 { BGP_EXT_COM_RO_1, "origin"},
462 { BGP_EXT_COM_RO_2, "origin"},
463 { BGP_EXT_COM_LINKBAND, "link-BW"},
464 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
465 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
466 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
467 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
468 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
469 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
470 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
471 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
472 { BGP_EXT_COM_L2INFO, "layer2-info"},
473 { BGP_EXT_COM_EIGRP_GEN, "eigrp-general-route (flag, tag)" },
474 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY, "eigrp-route-metric (AS, delay)" },
475 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW, "eigrp-route-metric (reliability, nexthop, bandwidth)" },
476 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU, "eigrp-route-metric (load, MTU)" },
477 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID, "eigrp-external-route (remote-AS, remote-ID)" },
478 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC, "eigrp-external-route (remote-proto, remote-metric)" },
479 { BGP_EXT_COM_SOURCE_AS, "source-AS" },
480 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
481 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
482 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
483 { 0, NULL},
484 };
485
486 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
487 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
488 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
489 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
490 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
491 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
492 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
493 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
494
495 static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
496 { BGP_OSPF_RTYPE_RTR, "Router" },
497 { BGP_OSPF_RTYPE_NET, "Network" },
498 { BGP_OSPF_RTYPE_SUM, "Summary" },
499 { BGP_OSPF_RTYPE_EXT, "External" },
500 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
501 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
502 { 0, NULL },
503 };
504
505 /* ADD-PATH Send/Receive field values */
506 static const struct tok bgp_add_path_recvsend[] = {
507 { 1, "Receive" },
508 { 2, "Send" },
509 { 3, "Both" },
510 { 0, NULL },
511 };
512
513 static char astostr[20];
514
515 /*
516 * as_printf
517 *
518 * Convert an AS number into a string and return string pointer.
519 *
520 * Depending on bflag is set or not, AS number is converted into ASDOT notation
521 * or plain number notation.
522 *
523 */
524 static char *
525 as_printf(netdissect_options *ndo,
526 char *str, size_t size, u_int asnum)
527 {
528 if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
529 snprintf(str, size, "%u", asnum);
530 } else {
531 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
532 }
533 return str;
534 }
535
536 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
537
538 int
539 decode_prefix4(netdissect_options *ndo,
540 const u_char *pptr, u_int itemlen, char *buf, size_t buflen)
541 {
542 nd_ipv4 addr;
543 u_int plen, plenbytes;
544
545 ND_TCHECK_1(pptr);
546 ITEMCHECK(1);
547 plen = GET_U_1(pptr);
548 if (32 < plen)
549 return -1;
550 itemlen -= 1;
551
552 memset(&addr, 0, sizeof(addr));
553 plenbytes = (plen + 7) / 8;
554 ND_TCHECK_LEN(pptr + 1, plenbytes);
555 ITEMCHECK(plenbytes);
556 memcpy(&addr, pptr + 1, plenbytes);
557 if (plen % 8) {
558 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
559 }
560 snprintf(buf, buflen, "%s/%u", ipaddr_string(ndo, (const u_char *)&addr), plen);
561 return 1 + plenbytes;
562
563 trunc:
564 return -2;
565
566 badtlv:
567 return -3;
568 }
569
570 static int
571 decode_labeled_prefix4(netdissect_options *ndo,
572 const u_char *pptr, u_int itemlen, char *buf,
573 size_t buflen)
574 {
575 nd_ipv4 addr;
576 u_int plen, plenbytes;
577
578 /* prefix length and label = 4 bytes */
579 ND_TCHECK_4(pptr);
580 ITEMCHECK(4);
581 plen = GET_U_1(pptr); /* get prefix length */
582
583 /* this is one of the weirdnesses of rfc3107
584 the label length (actually the label + COS bits)
585 is added to the prefix length;
586 we also do only read out just one label -
587 there is no real application for advertisement of
588 stacked labels in a single BGP message
589 */
590
591 if (24 > plen)
592 return -1;
593
594 plen-=24; /* adjust prefixlen - labellength */
595
596 if (32 < plen)
597 return -1;
598 itemlen -= 4;
599
600 memset(&addr, 0, sizeof(addr));
601 plenbytes = (plen + 7) / 8;
602 ND_TCHECK_LEN(pptr + 4, plenbytes);
603 ITEMCHECK(plenbytes);
604 memcpy(&addr, pptr + 4, plenbytes);
605 if (plen % 8) {
606 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
607 }
608 /* the label may get offsetted by 4 bits so lets shift it right */
609 snprintf(buf, buflen, "%s/%u, label:%u %s",
610 ipaddr_string(ndo, (const u_char *)&addr),
611 plen,
612 GET_BE_U_3(pptr + 1)>>4,
613 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
614
615 return 4 + plenbytes;
616
617 trunc:
618 return -2;
619
620 badtlv:
621 return -3;
622 }
623
624 /*
625 * bgp_vpn_ip_print
626 *
627 * print an ipv4 or ipv6 address into a buffer dependend on address length.
628 */
629 static char *
630 bgp_vpn_ip_print(netdissect_options *ndo,
631 const u_char *pptr, u_int addr_length)
632 {
633
634 /* worst case string is s fully formatted v6 address */
635 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
636 char *pos = addr;
637
638 switch(addr_length) {
639 case (sizeof(nd_ipv4) << 3): /* 32 */
640 ND_TCHECK_LEN(pptr, sizeof(nd_ipv4));
641 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
642 break;
643 case (sizeof(nd_ipv6) << 3): /* 128 */
644 ND_TCHECK_LEN(pptr, sizeof(nd_ipv6));
645 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
646 break;
647 default:
648 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
649 break;
650 }
651 pos += strlen(pos);
652
653 trunc:
654 *(pos) = '\0';
655 return (addr);
656 }
657
658 /*
659 * bgp_vpn_sg_print
660 *
661 * print an multicast s,g entry into a buffer.
662 * the s,g entry is encoded like this.
663 *
664 * +-----------------------------------+
665 * | Multicast Source Length (1 octet) |
666 * +-----------------------------------+
667 * | Multicast Source (Variable) |
668 * +-----------------------------------+
669 * | Multicast Group Length (1 octet) |
670 * +-----------------------------------+
671 * | Multicast Group (Variable) |
672 * +-----------------------------------+
673 *
674 * return the number of bytes read from the wire.
675 */
676 static u_int
677 bgp_vpn_sg_print(netdissect_options *ndo,
678 const u_char *pptr, char *buf, size_t buflen)
679 {
680 uint8_t addr_length;
681 u_int total_length, offset;
682
683 total_length = 0;
684
685 /* Source address length, encoded in bits */
686 ND_TCHECK_1(pptr);
687 addr_length = GET_U_1(pptr);
688 pptr++;
689
690 /* Source address */
691 ND_TCHECK_LEN(pptr, (addr_length >> 3));
692 total_length += (addr_length >> 3) + 1;
693 offset = (u_int)strlen(buf);
694 if (addr_length) {
695 snprintf(buf + offset, buflen - offset, ", Source %s",
696 bgp_vpn_ip_print(ndo, pptr, addr_length));
697 pptr += (addr_length >> 3);
698 }
699
700 /* Group address length, encoded in bits */
701 ND_TCHECK_1(pptr);
702 addr_length = GET_U_1(pptr);
703 pptr++;
704
705 /* Group address */
706 ND_TCHECK_LEN(pptr, (addr_length >> 3));
707 total_length += (addr_length >> 3) + 1;
708 offset = (u_int)strlen(buf);
709 if (addr_length) {
710 snprintf(buf + offset, buflen - offset, ", Group %s",
711 bgp_vpn_ip_print(ndo, pptr, addr_length));
712 pptr += (addr_length >> 3);
713 }
714
715 trunc:
716 return (total_length);
717 }
718
719 /* Print an RFC 4364 Route Distinguisher */
720 const char *
721 bgp_vpn_rd_print(netdissect_options *ndo,
722 const u_char *pptr)
723 {
724 /* allocate space for the largest possible string */
725 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
726 char *pos = rd;
727
728 /* ok lets load the RD format */
729 switch (GET_BE_U_2(pptr)) {
730
731 case 0:
732 /* 2-byte-AS:number fmt */
733 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
734 GET_BE_U_2(pptr + 2),
735 GET_BE_U_4(pptr + 4),
736 GET_U_1(pptr + 4), GET_U_1(pptr + 5),
737 GET_U_1(pptr + 6), GET_U_1(pptr + 7));
738 break;
739
740 case 1:
741 /* IP-address:AS fmt */
742 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
743 GET_U_1(pptr + 2), GET_U_1(pptr + 3),
744 GET_U_1(pptr + 4), GET_U_1(pptr + 5),
745 GET_BE_U_2(pptr + 6));
746 break;
747
748 case 2:
749 /* 4-byte-AS:number fmt */
750 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
751 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 2)),
752 GET_BE_U_2(pptr + 6), GET_U_1(pptr + 2),
753 GET_U_1(pptr + 3), GET_U_1(pptr + 4),
754 GET_U_1(pptr + 5), GET_BE_U_2(pptr + 6));
755 break;
756 default:
757 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
758 break;
759 }
760 pos += strlen(pos);
761 *(pos) = '\0';
762 return (rd);
763 }
764
765 /*
766 * Print an RFC 4360 Extended Community.
767 */
768 static void
769 bgp_extended_community_print(netdissect_options *ndo,
770 const u_char *pptr)
771 {
772 union { /* copy buffer for bandwidth values */
773 float f;
774 uint32_t i;
775 } bw;
776
777 switch (GET_BE_U_2(pptr)) {
778
779 case BGP_EXT_COM_RT_0:
780 case BGP_EXT_COM_RO_0:
781 case BGP_EXT_COM_L2VPN_RT_0:
782 ND_PRINT("%u:%u (= %s)",
783 GET_BE_U_2(pptr + 2),
784 GET_BE_U_4(pptr + 4),
785 ipaddr_string(ndo, pptr+4));
786 break;
787
788 case BGP_EXT_COM_RT_1:
789 case BGP_EXT_COM_RO_1:
790 case BGP_EXT_COM_L2VPN_RT_1:
791 case BGP_EXT_COM_VRF_RT_IMP:
792 ND_PRINT("%s:%u",
793 ipaddr_string(ndo, pptr+2),
794 GET_BE_U_2(pptr + 6));
795 break;
796
797 case BGP_EXT_COM_RT_2:
798 case BGP_EXT_COM_RO_2:
799 ND_PRINT("%s:%u",
800 as_printf(ndo, astostr, sizeof(astostr),
801 GET_BE_U_4(pptr + 2)), GET_BE_U_2(pptr + 6));
802 break;
803
804 case BGP_EXT_COM_LINKBAND:
805 bw.i = GET_BE_U_4(pptr + 2);
806 ND_PRINT("bandwidth: %.3f Mbps",
807 bw.f*8/1000000);
808 break;
809
810 case BGP_EXT_COM_VPN_ORIGIN:
811 case BGP_EXT_COM_VPN_ORIGIN2:
812 case BGP_EXT_COM_VPN_ORIGIN3:
813 case BGP_EXT_COM_VPN_ORIGIN4:
814 case BGP_EXT_COM_OSPF_RID:
815 case BGP_EXT_COM_OSPF_RID2:
816 ND_PRINT("%s", ipaddr_string(ndo, pptr+2));
817 break;
818
819 case BGP_EXT_COM_OSPF_RTYPE:
820 case BGP_EXT_COM_OSPF_RTYPE2:
821 ND_PRINT("area:%s, router-type:%s, metric-type:%s%s",
822 ipaddr_string(ndo, pptr+2),
823 tok2str(bgp_extd_comm_ospf_rtype_values,
824 "unknown (0x%02x)",
825 GET_U_1((pptr + 6))),
826 (GET_U_1(pptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
827 ((GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_EXT) || (GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "");
828 break;
829
830 case BGP_EXT_COM_L2INFO:
831 ND_PRINT("%s Control Flags [0x%02x]:MTU %u",
832 tok2str(l2vpn_encaps_values,
833 "unknown encaps",
834 GET_U_1((pptr + 2))),
835 GET_U_1((pptr + 3)),
836 GET_BE_U_2(pptr + 4));
837 break;
838
839 case BGP_EXT_COM_SOURCE_AS:
840 ND_PRINT("AS %u", GET_BE_U_2(pptr + 2));
841 break;
842
843 default:
844 ND_PRINT("%02x%02x%02x%02x%02x%02x",
845 GET_U_1(pptr + 2),
846 GET_U_1(pptr + 3),
847 GET_U_1(pptr + 4),
848 GET_U_1(pptr + 5),
849 GET_U_1(pptr + 6),
850 GET_U_1(pptr + 7));
851 break;
852 }
853 }
854
855 /* RFC 4684 */
856 static int
857 decode_rt_routing_info(netdissect_options *ndo,
858 const u_char *pptr)
859 {
860 u_int plen;
861 char asbuf[sizeof(astostr)]; /* bgp_vpn_rd_print() overwrites astostr */
862
863 /* NLRI "prefix length" from RFC 2858 Section 4. */
864 ND_TCHECK_1(pptr);
865 plen = GET_U_1(pptr); /* get prefix length */
866
867 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
868 * RFC 4684 Section 4 defines the layout of "origin AS" and "route
869 * target" fields inside the "prefix" depending on its length.
870 */
871 if (0 == plen) {
872 /* Without "origin AS", without "route target". */
873 ND_PRINT("\n\t default route target");
874 return 1;
875 }
876
877 if (32 > plen) {
878 ND_PRINT("\n\t (illegal prefix length)");
879 return -1;
880 }
881
882 /* With at least "origin AS", possibly with "route target". */
883 ND_TCHECK_4(pptr + 1);
884 as_printf(ndo, asbuf, sizeof(asbuf), GET_BE_U_4(pptr + 1));
885
886 plen -= 32; /* adjust prefix length */
887
888 /* An extended community is 8 octets, so the remaining prefix
889 * length must be 64.
890 */
891 if (64 != plen) {
892 ND_PRINT("\n\t (illegal prefix length)");
893 return -1;
894 }
895 ND_TCHECK_LEN(pptr + 5, 8);
896 ND_PRINT("\n\t origin AS: %s, route target ", asbuf);
897 bgp_extended_community_print(ndo, pptr + 5);
898
899 return 5 + 8;
900
901 trunc:
902 return -2;
903 }
904
905 static int
906 decode_labeled_vpn_prefix4(netdissect_options *ndo,
907 const u_char *pptr, char *buf, size_t buflen)
908 {
909 nd_ipv4 addr;
910 u_int plen;
911
912 ND_TCHECK_1(pptr);
913 plen = GET_U_1(pptr); /* get prefix length */
914
915 if ((24+64) > plen)
916 return -1;
917
918 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
919
920 if (32 < plen)
921 return -1;
922
923 memset(&addr, 0, sizeof(addr));
924 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
925 memcpy(&addr, pptr + 12, (plen + 7) / 8);
926 if (plen % 8) {
927 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
928 ((0xff00 >> (plen % 8)) & 0xff);
929 }
930 /* the label may get offsetted by 4 bits so lets shift it right */
931 snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
932 bgp_vpn_rd_print(ndo, pptr+4),
933 ipaddr_string(ndo, (const u_char *)&addr),
934 plen,
935 GET_BE_U_3(pptr + 1)>>4,
936 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
937
938 return 12 + (plen + 7) / 8;
939
940 trunc:
941 return -2;
942 }
943
944 /*
945 * +-------------------------------+
946 * | |
947 * | RD:IPv4-address (12 octets) |
948 * | |
949 * +-------------------------------+
950 * | MDT Group-address (4 octets) |
951 * +-------------------------------+
952 */
953
954 #define MDT_VPN_NLRI_LEN 16
955
956 static int
957 decode_mdt_vpn_nlri(netdissect_options *ndo,
958 const u_char *pptr, char *buf, size_t buflen)
959 {
960 const u_char *rd;
961 const u_char *vpn_ip;
962
963 ND_TCHECK_1(pptr);
964
965 /* if the NLRI is not predefined length, quit.*/
966 if (GET_U_1(pptr) != MDT_VPN_NLRI_LEN * 8)
967 return -1;
968 pptr++;
969
970 /* RD */
971 ND_TCHECK_8(pptr);
972 rd = pptr;
973 pptr += 8;
974
975 /* IPv4 address */
976 ND_TCHECK_LEN(pptr, sizeof(nd_ipv4));
977 vpn_ip = pptr;
978 pptr += sizeof(nd_ipv4);
979
980 /* MDT Group Address */
981 ND_TCHECK_LEN(pptr, sizeof(nd_ipv4));
982
983 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
984 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
985
986 return MDT_VPN_NLRI_LEN + 1;
987
988 trunc:
989 return -2;
990 }
991
992 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
993 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
994 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
995 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
996 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
997 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
998 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
999
1000 static const struct tok bgp_multicast_vpn_route_type_values[] = {
1001 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
1002 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
1003 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
1004 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
1005 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
1006 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
1007 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
1008 { 0, NULL}
1009 };
1010
1011 static int
1012 decode_multicast_vpn(netdissect_options *ndo,
1013 const u_char *pptr, char *buf, size_t buflen)
1014 {
1015 uint8_t route_type, route_length;
1016 u_int addr_length, sg_length;
1017 u_int offset;
1018
1019 ND_TCHECK_2(pptr);
1020 route_type = GET_U_1(pptr);
1021 pptr++;
1022 route_length = GET_U_1(pptr);
1023 pptr++;
1024
1025 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
1026 tok2str(bgp_multicast_vpn_route_type_values,
1027 "Unknown", route_type),
1028 route_type, route_length);
1029
1030 switch(route_type) {
1031 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
1032 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1033 offset = (u_int)strlen(buf);
1034 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
1035 bgp_vpn_rd_print(ndo, pptr),
1036 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
1037 (route_length - BGP_VPN_RD_LEN) << 3));
1038 break;
1039 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
1040 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1041 offset = (u_int)strlen(buf);
1042 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
1043 bgp_vpn_rd_print(ndo, pptr),
1044 as_printf(ndo, astostr, sizeof(astostr),
1045 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1046 break;
1047
1048 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
1049 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1050 offset = (u_int)strlen(buf);
1051 snprintf(buf + offset, buflen - offset, ", RD: %s",
1052 bgp_vpn_rd_print(ndo, pptr));
1053 pptr += BGP_VPN_RD_LEN;
1054
1055 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1056 addr_length = route_length - sg_length;
1057
1058 ND_TCHECK_LEN(pptr, addr_length);
1059 offset = (u_int)strlen(buf);
1060 snprintf(buf + offset, buflen - offset, ", Originator %s",
1061 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
1062 break;
1063
1064 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
1065 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
1066 offset = (u_int)strlen(buf);
1067 snprintf(buf + offset, buflen - offset, ", RD: %s",
1068 bgp_vpn_rd_print(ndo, pptr));
1069 pptr += BGP_VPN_RD_LEN;
1070
1071 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1072 break;
1073
1074 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
1075 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
1076 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
1077 offset = (u_int)strlen(buf);
1078 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
1079 bgp_vpn_rd_print(ndo, pptr),
1080 as_printf(ndo, astostr, sizeof(astostr),
1081 GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
1082 pptr += BGP_VPN_RD_LEN + 4;
1083
1084 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1085 break;
1086
1087 /*
1088 * no per route-type printing yet.
1089 */
1090 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
1091 default:
1092 break;
1093 }
1094
1095 return route_length + 2;
1096
1097 trunc:
1098 return -2;
1099 }
1100
1101 /*
1102 * As I remember, some versions of systems have an snprintf() that
1103 * returns -1 if the buffer would have overflowed. If the return
1104 * value is negative, set buflen to 0, to indicate that we've filled
1105 * the buffer up.
1106 *
1107 * If the return value is greater than buflen, that means that
1108 * the buffer would have overflowed; again, set buflen to 0 in
1109 * that case.
1110 */
1111 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1112 if (stringlen<0) \
1113 buflen=0; \
1114 else if ((u_int)stringlen>buflen) \
1115 buflen=0; \
1116 else { \
1117 buflen-=stringlen; \
1118 buf+=stringlen; \
1119 }
1120
1121 static int
1122 decode_labeled_vpn_l2(netdissect_options *ndo,
1123 const u_char *pptr, char *buf, size_t buflen)
1124 {
1125 u_int plen, tlen, tlv_type, tlv_len, ttlv_len;
1126 int stringlen;
1127
1128 ND_TCHECK_2(pptr);
1129 plen = GET_BE_U_2(pptr);
1130 tlen = plen;
1131 pptr += 2;
1132 /* Old and new L2VPN NLRI share AFI/SAFI
1133 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1134 * and > 17 as old format. Complain for the middle case
1135 */
1136 if (plen == 12) {
1137 /* assume AD-only with RD, BGPNH */
1138 ND_TCHECK_LEN(pptr, 12);
1139 buf[0] = '\0';
1140 stringlen = snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1141 bgp_vpn_rd_print(ndo, pptr),
1142 ipaddr_string(ndo, pptr+8));
1143 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1144 pptr += 12;
1145 tlen -= 12;
1146 return plen + 2;
1147 } else if (plen > 17) {
1148 /* assume old format */
1149 /* RD, ID, LBLKOFF, LBLBASE */
1150
1151 ND_TCHECK_LEN(pptr, 15);
1152 buf[0] = '\0';
1153 stringlen = snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1154 bgp_vpn_rd_print(ndo, pptr),
1155 GET_BE_U_2(pptr + 8),
1156 GET_BE_U_2(pptr + 10),
1157 GET_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1158 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1159 pptr += 15;
1160 tlen -= 15;
1161
1162 /* ok now the variable part - lets read out TLVs*/
1163 while (tlen != 0) {
1164 if (tlen < 3) {
1165 if (buflen != 0) {
1166 stringlen=snprintf(buf,buflen, "\n\t\tran past the end");
1167 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1168 }
1169 return plen + 2;
1170 }
1171 ND_TCHECK_3(pptr);
1172 tlv_type = GET_U_1(pptr);
1173 pptr++;
1174 tlv_len = GET_BE_U_2(pptr); /* length, in *bits* */
1175 ttlv_len = (tlv_len + 7)/8; /* length, in *bytes* */
1176 pptr += 2;
1177
1178 switch(tlv_type) {
1179 case 1:
1180 if (buflen != 0) {
1181 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1182 tlv_type,
1183 tlv_len);
1184 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1185 }
1186 while (ttlv_len != 0) {
1187 if (tlen < 1) {
1188 if (buflen != 0) {
1189 stringlen=snprintf(buf,buflen, " (ran past the end)");
1190 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1191 }
1192 return plen + 2;
1193 }
1194 ND_TCHECK_1(pptr);
1195 if (buflen != 0) {
1196 stringlen=snprintf(buf,buflen, "%02x",
1197 GET_U_1(pptr));
1198 pptr++;
1199 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1200 }
1201 ttlv_len--;
1202 tlen--;
1203 }
1204 break;
1205 default:
1206 if (buflen != 0) {
1207 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1208 tlv_type,
1209 tlv_len);
1210 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1211 }
1212 if (tlen < ttlv_len) {
1213 if (buflen != 0) {
1214 stringlen=snprintf(buf,buflen, " (ran past the end)");
1215 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1216 }
1217 return plen + 2;
1218 }
1219 tlen -= ttlv_len;
1220 break;
1221 }
1222 }
1223 return plen + 2;
1224 } else {
1225 /* complain bitterly ? */
1226 /* fall through */
1227 goto trunc;
1228 }
1229
1230 trunc:
1231 return -2;
1232 }
1233
1234 int
1235 decode_prefix6(netdissect_options *ndo,
1236 const u_char *pd, u_int itemlen, char *buf, size_t buflen)
1237 {
1238 nd_ipv6 addr;
1239 u_int plen, plenbytes;
1240
1241 ND_TCHECK_1(pd);
1242 ITEMCHECK(1);
1243 plen = GET_U_1(pd);
1244 if (128 < plen)
1245 return -1;
1246 itemlen -= 1;
1247
1248 memset(&addr, 0, sizeof(addr));
1249 plenbytes = (plen + 7) / 8;
1250 ND_TCHECK_LEN(pd + 1, plenbytes);
1251 ITEMCHECK(plenbytes);
1252 memcpy(&addr, pd + 1, plenbytes);
1253 if (plen % 8) {
1254 addr[plenbytes - 1] &=
1255 ((0xff00 >> (plen % 8)) & 0xff);
1256 }
1257 snprintf(buf, buflen, "%s/%u", ip6addr_string(ndo, (const u_char *)&addr), plen);
1258 return 1 + plenbytes;
1259
1260 trunc:
1261 return -2;
1262
1263 badtlv:
1264 return -3;
1265 }
1266
1267 static int
1268 decode_labeled_prefix6(netdissect_options *ndo,
1269 const u_char *pptr, u_int itemlen, char *buf, size_t buflen)
1270 {
1271 nd_ipv6 addr;
1272 u_int plen, plenbytes;
1273
1274 /* prefix length and label = 4 bytes */
1275 ND_TCHECK_4(pptr);
1276 ITEMCHECK(4);
1277 plen = GET_U_1(pptr); /* get prefix length */
1278
1279 if (24 > plen)
1280 return -1;
1281
1282 plen -= 24; /* adjust prefixlen - labellength */
1283
1284 if (128 < plen)
1285 return -1;
1286 itemlen -= 4;
1287
1288 memset(&addr, 0, sizeof(addr));
1289 plenbytes = (plen + 7) / 8;
1290 ND_TCHECK_LEN(pptr + 4, plenbytes);
1291 memcpy(&addr, pptr + 4, plenbytes);
1292 if (plen % 8) {
1293 addr[plenbytes - 1] &=
1294 ((0xff00 >> (plen % 8)) & 0xff);
1295 }
1296 /* the label may get offsetted by 4 bits so lets shift it right */
1297 snprintf(buf, buflen, "%s/%u, label:%u %s",
1298 ip6addr_string(ndo, (const u_char *)&addr),
1299 plen,
1300 GET_BE_U_3(pptr + 1)>>4,
1301 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1302
1303 return 4 + plenbytes;
1304
1305 trunc:
1306 return -2;
1307
1308 badtlv:
1309 return -3;
1310 }
1311
1312 static int
1313 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1314 const u_char *pptr, char *buf, size_t buflen)
1315 {
1316 nd_ipv6 addr;
1317 u_int plen;
1318
1319 ND_TCHECK_1(pptr);
1320 plen = GET_U_1(pptr); /* get prefix length */
1321
1322 if ((24+64) > plen)
1323 return -1;
1324
1325 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1326
1327 if (128 < plen)
1328 return -1;
1329
1330 memset(&addr, 0, sizeof(addr));
1331 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1332 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1333 if (plen % 8) {
1334 addr[(plen + 7) / 8 - 1] &=
1335 ((0xff00 >> (plen % 8)) & 0xff);
1336 }
1337 /* the label may get offsetted by 4 bits so lets shift it right */
1338 snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1339 bgp_vpn_rd_print(ndo, pptr+4),
1340 ip6addr_string(ndo, (const u_char *)&addr),
1341 plen,
1342 GET_BE_U_3(pptr + 1)>>4,
1343 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1344
1345 return 12 + (plen + 7) / 8;
1346
1347 trunc:
1348 return -2;
1349 }
1350
1351 static int
1352 decode_clnp_prefix(netdissect_options *ndo,
1353 const u_char *pptr, char *buf, size_t buflen)
1354 {
1355 uint8_t addr[19];
1356 u_int plen;
1357
1358 ND_TCHECK_1(pptr);
1359 plen = GET_U_1(pptr); /* get prefix length */
1360
1361 if (152 < plen)
1362 return -1;
1363
1364 memset(&addr, 0, sizeof(addr));
1365 ND_TCHECK_LEN(pptr + 4, (plen + 7) / 8);
1366 memcpy(&addr, pptr + 4, (plen + 7) / 8);
1367 if (plen % 8) {
1368 addr[(plen + 7) / 8 - 1] &=
1369 ((0xff00 >> (plen % 8)) & 0xff);
1370 }
1371 snprintf(buf, buflen, "%s/%u",
1372 isonsap_string(ndo, addr,(plen + 7) / 8),
1373 plen);
1374
1375 return 1 + (plen + 7) / 8;
1376
1377 trunc:
1378 return -2;
1379 }
1380
1381 static int
1382 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1383 const u_char *pptr, char *buf, size_t buflen)
1384 {
1385 uint8_t addr[19];
1386 u_int plen;
1387
1388 ND_TCHECK_1(pptr);
1389 plen = GET_U_1(pptr); /* get prefix length */
1390
1391 if ((24+64) > plen)
1392 return -1;
1393
1394 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1395
1396 if (152 < plen)
1397 return -1;
1398
1399 memset(&addr, 0, sizeof(addr));
1400 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1401 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1402 if (plen % 8) {
1403 addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
1404 }
1405 /* the label may get offsetted by 4 bits so lets shift it right */
1406 snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
1407 bgp_vpn_rd_print(ndo, pptr+4),
1408 isonsap_string(ndo, addr,(plen + 7) / 8),
1409 plen,
1410 GET_BE_U_3(pptr + 1)>>4,
1411 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1412
1413 return 12 + (plen + 7) / 8;
1414
1415 trunc:
1416 return -2;
1417 }
1418
1419 /*
1420 * bgp_attr_get_as_size
1421 *
1422 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1423 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1424 * support, exchange AS-Path with the same path-attribute type value 0x02.
1425 */
1426 static u_int
1427 bgp_attr_get_as_size(netdissect_options *ndo,
1428 uint8_t bgpa_type, const u_char *pptr, u_int len)
1429 {
1430 const u_char *tptr = pptr;
1431
1432 /*
1433 * If the path attribute is the optional AS4 path type, then we already
1434 * know, that ASs must be encoded in 4 byte format.
1435 */
1436 if (bgpa_type == BGPTYPE_AS4_PATH) {
1437 return 4;
1438 }
1439
1440 /*
1441 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1442 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1443 * each.
1444 */
1445 while (tptr < pptr + len) {
1446 ND_TCHECK_1(tptr);
1447
1448 /*
1449 * If we do not find a valid segment type, our guess might be wrong.
1450 */
1451 if (GET_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || GET_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
1452 goto trunc;
1453 }
1454 ND_TCHECK_1(tptr + 1);
1455 tptr += 2 + GET_U_1(tptr + 1) * 2;
1456 }
1457
1458 /*
1459 * If we correctly reached end of the AS path attribute data content,
1460 * then most likely ASs were indeed encoded as 2 bytes.
1461 */
1462 if (tptr == pptr + len) {
1463 return 2;
1464 }
1465
1466 trunc:
1467
1468 /*
1469 * We can come here, either we did not have enough data, or if we
1470 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1471 * so that calller can try to decode each AS as of 4 bytes. If indeed
1472 * there was not enough data, it will crib and end the parse anyways.
1473 */
1474 return 4;
1475 }
1476
1477 /*
1478 * The only way to know that a BGP UPDATE message is using add path is
1479 * by checking if the capability is in the OPEN message which we may have missed.
1480 * So this function checks if it is possible that the update could contain add path
1481 * and if so it checks that standard BGP doesn't make sense.
1482 */
1483 static int
1484 check_add_path(netdissect_options *ndo, const u_char *pptr, u_int length,
1485 u_int max_prefix_length)
1486 {
1487 u_int offset, prefix_length;
1488
1489 if (length < 5) {
1490 return 0;
1491 }
1492
1493 /*
1494 * Scan through the NLRI information under the assumpetion that
1495 * it doesn't have path IDs.
1496 */
1497 for (offset = 0; offset < length;) {
1498 offset += 4;
1499 if (!ND_TTEST_1(pptr + offset)) {
1500 /* We ran out of captured data; quit scanning. */
1501 break;
1502 }
1503 prefix_length = GET_U_1(pptr + offset);
1504 /*
1505 * Add 4 to cover the path id
1506 * and check the prefix length isn't greater than 32/128.
1507 */
1508 if (prefix_length > max_prefix_length) {
1509 return 0;
1510 }
1511 /* Add 1 for the prefix_length byte and prefix_length to cover the address */
1512 offset += 1 + ((prefix_length + 7) / 8);
1513 }
1514 /* check we haven't gone past the end of the section */
1515 if (offset > length) {
1516 return 0;
1517 }
1518
1519 /* check it's not standard BGP */
1520 for (offset = 0; offset < length; ) {
1521 if (!ND_TTEST_1(pptr + offset)) {
1522 /* We ran out of captured data; quit scanning. */
1523 break;
1524 }
1525 prefix_length = GET_U_1(pptr + offset);
1526 /*
1527 * If the prefix_length is zero (0.0.0.0/0)
1528 * and since it's not the only address (length >= 5)
1529 * then it is add-path
1530 */
1531 if (prefix_length < 1 || prefix_length > max_prefix_length) {
1532 return 1;
1533 }
1534 offset += 1 + ((prefix_length + 7) / 8);
1535 }
1536 if (offset > length) {
1537 return 1;
1538 }
1539
1540 /* assume not add-path by default */
1541 return 0;
1542 }
1543
1544 static int
1545 bgp_mp_af_print(netdissect_options *ndo,
1546 const u_char *tptr, u_int tlen,
1547 uint16_t *afp, uint8_t *safip)
1548 {
1549 uint16_t af;
1550 uint8_t safi;
1551
1552 af = GET_BE_U_2(tptr);
1553 *afp = af;
1554 safi = GET_U_1(tptr + 2);
1555 *safip = safi;
1556
1557 ND_PRINT("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1558 tok2str(af_values, "Unknown AFI", af),
1559 af,
1560 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1561 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1562 safi);
1563
1564 switch(af<<8 | safi) {
1565 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1566 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1567 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1568 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1569 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1570 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1571 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1572 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1573 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1574 case (AFNUM_INET<<8 | SAFNUM_MDT):
1575 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1576 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1577 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1578 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1579 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1580 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1581 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1582 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1583 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1584 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1585 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1586 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1587 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1588 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1589 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1590 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1591 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1592 break;
1593 default:
1594 ND_TCHECK_LEN(tptr, tlen);
1595 ND_PRINT("\n\t no AFI %u / SAFI %u decoder", af, safi);
1596 if (ndo->ndo_vflag <= 1)
1597 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1598 return -1;
1599 }
1600 return 0;
1601 trunc:
1602 return -2;
1603 }
1604
1605 static int
1606 bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi,
1607 const u_char *tptr, u_int len,
1608 char *buf, size_t buflen,
1609 int add_path4, int add_path6)
1610 {
1611 int advance;
1612 u_int path_id = 0;
1613
1614 switch (af<<8 | safi) {
1615 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1616 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1617 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1618 if (add_path4) {
1619 path_id = GET_BE_U_4(tptr);
1620 tptr += 4;
1621 }
1622 advance = decode_prefix4(ndo, tptr, len, buf, buflen);
1623 if (advance == -1)
1624 ND_PRINT("\n\t (illegal prefix length)");
1625 else if (advance == -2)
1626 goto trunc;
1627 else if (advance == -3)
1628 break; /* bytes left, but not enough */
1629 else
1630 ND_PRINT("\n\t %s", buf);
1631 if (add_path4) {
1632 ND_PRINT(" Path Id: %u", path_id);
1633 advance += 4;
1634 }
1635 break;
1636 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1637 advance = decode_labeled_prefix4(ndo, tptr, len, buf, buflen);
1638 if (advance == -1)
1639 ND_PRINT("\n\t (illegal prefix length)");
1640 else if (advance == -2)
1641 goto trunc;
1642 else if (advance == -3)
1643 break; /* bytes left, but not enough */
1644 else
1645 ND_PRINT("\n\t %s", buf);
1646 break;
1647 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1648 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1649 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1650 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, buflen);
1651 if (advance == -1)
1652 ND_PRINT("\n\t (illegal prefix length)");
1653 else if (advance == -2)
1654 goto trunc;
1655 else
1656 ND_PRINT("\n\t %s", buf);
1657 break;
1658 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1659 advance = decode_rt_routing_info(ndo, tptr);
1660 if (advance == -2)
1661 goto trunc;
1662 break;
1663 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1664 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1665 advance = decode_multicast_vpn(ndo, tptr, buf, buflen);
1666 if (advance == -1)
1667 ND_PRINT("\n\t (illegal prefix length)");
1668 else if (advance == -2)
1669 goto trunc;
1670 else
1671 ND_PRINT("\n\t %s", buf);
1672 break;
1673
1674 case (AFNUM_INET<<8 | SAFNUM_MDT):
1675 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, buflen);
1676 if (advance == -1)
1677 ND_PRINT("\n\t (illegal prefix length)");
1678 else if (advance == -2)
1679 goto trunc;
1680 else
1681 ND_PRINT("\n\t %s", buf);
1682 break;
1683 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1684 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1685 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1686 if (add_path6) {
1687 path_id = GET_BE_U_4(tptr);
1688 tptr += 4;
1689 }
1690 advance = decode_prefix6(ndo, tptr, len, buf, buflen);
1691 if (advance == -1)
1692 ND_PRINT("\n\t (illegal prefix length)");
1693 else if (advance == -2)
1694 goto trunc;
1695 else if (advance == -3)
1696 break; /* bytes left, but not enough */
1697 else
1698 ND_PRINT("\n\t %s", buf);
1699 if (add_path6) {
1700 ND_PRINT(" Path Id: %u", path_id);
1701 advance += 4;
1702 }
1703 break;
1704 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1705 advance = decode_labeled_prefix6(ndo, tptr, len, buf, buflen);
1706 if (advance == -1)
1707 ND_PRINT("\n\t (illegal prefix length)");
1708 else if (advance == -2)
1709 goto trunc;
1710 else if (advance == -3)
1711 break; /* bytes left, but not enough */
1712 else
1713 ND_PRINT("\n\t %s", buf);
1714 break;
1715 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1716 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1717 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1718 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, buflen);
1719 if (advance == -1)
1720 ND_PRINT("\n\t (illegal prefix length)");
1721 else if (advance == -2)
1722 goto trunc;
1723 else
1724 ND_PRINT("\n\t %s", buf);
1725 break;
1726 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1727 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1728 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1729 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1730 advance = decode_labeled_vpn_l2(ndo, tptr, buf, buflen);
1731 if (advance == -1)
1732 ND_PRINT("\n\t (illegal length)");
1733 else if (advance == -2)
1734 goto trunc;
1735 else
1736 ND_PRINT("\n\t %s", buf);
1737 break;
1738 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1739 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1740 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1741 advance = decode_clnp_prefix(ndo, tptr, buf, buflen);
1742 if (advance == -1)
1743 ND_PRINT("\n\t (illegal prefix length)");
1744 else if (advance == -2)
1745 goto trunc;
1746 else
1747 ND_PRINT("\n\t %s", buf);
1748 break;
1749 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1750 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1751 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1752 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, buflen);
1753 if (advance == -1)
1754 ND_PRINT("\n\t (illegal prefix length)");
1755 else if (advance == -2)
1756 goto trunc;
1757 else
1758 ND_PRINT("\n\t %s", buf);
1759 break;
1760 default:
1761 /*
1762 * This should not happen, we should have been protected
1763 * by bgp_mp_af_print()'s return value.
1764 */
1765 ND_PRINT("\n\t ERROR: no AFI %u / SAFI %u decoder", af, safi);
1766 advance = -4;
1767 break;
1768 }
1769 return advance;
1770 trunc: /* we rely on the caller to recognize -2 return value */
1771 return -2;
1772 }
1773
1774 static int
1775 bgp_attr_print(netdissect_options *ndo,
1776 uint8_t atype, const u_char *pptr, u_int len)
1777 {
1778 u_int i;
1779 uint16_t af;
1780 uint8_t safi, snpa, nhlen;
1781 int advance;
1782 u_int tlen;
1783 const u_char *tptr;
1784 char buf[MAXHOSTNAMELEN + 100];
1785 u_int as_size;
1786 int add_path4, add_path6;
1787 int ret;
1788
1789 tptr = pptr;
1790 tlen = len;
1791
1792 switch (atype) {
1793 case BGPTYPE_ORIGIN:
1794 if (len != 1)
1795 ND_PRINT("invalid len");
1796 else {
1797 ND_TCHECK_1(tptr);
1798 ND_PRINT("%s", tok2str(bgp_origin_values,
1799 "Unknown Origin Typecode",
1800 GET_U_1(tptr)));
1801 }
1802 break;
1803
1804 /*
1805 * Process AS4 byte path and AS2 byte path attributes here.
1806 */
1807 case BGPTYPE_AS4_PATH:
1808 case BGPTYPE_AS_PATH:
1809 if (len % 2) {
1810 ND_PRINT("invalid len");
1811 break;
1812 }
1813 if (!len) {
1814 ND_PRINT("empty");
1815 break;
1816 }
1817
1818 /*
1819 * BGP updates exchanged between New speakers that support 4
1820 * byte AS, ASs are always encoded in 4 bytes. There is no
1821 * definitive way to find this, just by the packet's
1822 * contents. So, check for packet's TLV's sanity assuming
1823 * 2 bytes first, and it does not pass, assume that ASs are
1824 * encoded in 4 bytes format and move on.
1825 */
1826 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1827
1828 while (tptr < pptr + len) {
1829 ND_TCHECK_1(tptr);
1830 ND_PRINT("%s", tok2str(bgp_as_path_segment_open_values,
1831 "?", GET_U_1(tptr)));
1832 ND_TCHECK_1(tptr + 1);
1833 for (i = 0; i < GET_U_1(tptr + 1) * as_size; i += as_size) {
1834 ND_TCHECK_LEN(tptr + 2 + i, as_size);
1835 ND_PRINT("%s ",
1836 as_printf(ndo, astostr, sizeof(astostr),
1837 as_size == 2 ?
1838 GET_BE_U_2(tptr + i + 2) :
1839 GET_BE_U_4(tptr + i + 2)));
1840 }
1841 ND_TCHECK_1(tptr);
1842 ND_PRINT("%s", tok2str(bgp_as_path_segment_close_values,
1843 "?", GET_U_1(tptr)));
1844 ND_TCHECK_1(tptr + 1);
1845 tptr += 2 + GET_U_1(tptr + 1) * as_size;
1846 }
1847 break;
1848 case BGPTYPE_NEXT_HOP:
1849 if (len != 4)
1850 ND_PRINT("invalid len");
1851 else {
1852 ND_TCHECK_4(tptr);
1853 ND_PRINT("%s", ipaddr_string(ndo, tptr));
1854 }
1855 break;
1856 case BGPTYPE_MULTI_EXIT_DISC:
1857 case BGPTYPE_LOCAL_PREF:
1858 if (len != 4)
1859 ND_PRINT("invalid len");
1860 else {
1861 ND_TCHECK_4(tptr);
1862 ND_PRINT("%u", GET_BE_U_4(tptr));
1863 }
1864 break;
1865 case BGPTYPE_ATOMIC_AGGREGATE:
1866 if (len != 0)
1867 ND_PRINT("invalid len");
1868 break;
1869 case BGPTYPE_AGGREGATOR:
1870
1871 /*
1872 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1873 * the length of this PA can be either 6 bytes or 8 bytes.
1874 */
1875 if (len != 6 && len != 8) {
1876 ND_PRINT("invalid len");
1877 break;
1878 }
1879 ND_TCHECK_LEN(tptr, len);
1880 if (len == 6) {
1881 ND_PRINT(" AS #%s, origin %s",
1882 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(tptr)),
1883 ipaddr_string(ndo, tptr + 2));
1884 } else {
1885 ND_PRINT(" AS #%s, origin %s",
1886 as_printf(ndo, astostr, sizeof(astostr),
1887 GET_BE_U_4(tptr)), ipaddr_string(ndo, tptr + 4));
1888 }
1889 break;
1890 case BGPTYPE_AGGREGATOR4:
1891 if (len != 8) {
1892 ND_PRINT("invalid len");
1893 break;
1894 }
1895 ND_TCHECK_8(tptr);
1896 ND_PRINT(" AS #%s, origin %s",
1897 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)),
1898 ipaddr_string(ndo, tptr + 4));
1899 break;
1900 case BGPTYPE_COMMUNITIES:
1901 if (len % 4) {
1902 ND_PRINT("invalid len");
1903 break;
1904 }
1905 while (tlen != 0) {
1906 uint32_t comm;
1907 ND_TCHECK_4(tptr);
1908 if (tlen < 4)
1909 goto trunc;
1910 comm = GET_BE_U_4(tptr);
1911 switch (comm) {
1912 case BGP_COMMUNITY_NO_EXPORT:
1913 ND_PRINT(" NO_EXPORT");
1914 break;
1915 case BGP_COMMUNITY_NO_ADVERT:
1916 ND_PRINT(" NO_ADVERTISE");
1917 break;
1918 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1919 ND_PRINT(" NO_EXPORT_SUBCONFED");
1920 break;
1921 default:
1922 ND_PRINT("%u:%u%s",
1923 (comm >> 16) & 0xffff,
1924 comm & 0xffff,
1925 (tlen>4) ? ", " : "");
1926 break;
1927 }
1928 tlen -=4;
1929 tptr +=4;
1930 }
1931 break;
1932 case BGPTYPE_ORIGINATOR_ID:
1933 if (len != 4) {
1934 ND_PRINT("invalid len");
1935 break;
1936 }
1937 ND_TCHECK_4(tptr);
1938 ND_PRINT("%s",ipaddr_string(ndo, tptr));
1939 break;
1940 case BGPTYPE_CLUSTER_LIST:
1941 if (len % 4) {
1942 ND_PRINT("invalid len");
1943 break;
1944 }
1945 while (tlen != 0) {
1946 ND_TCHECK_4(tptr);
1947 if (tlen < 4)
1948 goto trunc;
1949 ND_PRINT("%s%s",
1950 ipaddr_string(ndo, tptr),
1951 (tlen>4) ? ", " : "");
1952 tlen -=4;
1953 tptr +=4;
1954 }
1955 break;
1956 case BGPTYPE_MP_REACH_NLRI:
1957 ND_TCHECK_3(tptr);
1958 if (tlen < 3)
1959 goto trunc;
1960 ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
1961 if (ret == -2)
1962 goto trunc;
1963 if (ret < 0)
1964 break;
1965
1966 tptr +=3;
1967
1968 ND_TCHECK_1(tptr);
1969 nhlen = GET_U_1(tptr);
1970 tlen = nhlen;
1971 tptr++;
1972
1973 if (tlen) {
1974 u_int nnh = 0;
1975 ND_PRINT("\n\t nexthop: ");
1976 while (tlen != 0) {
1977 if (nnh++ > 0) {
1978 ND_PRINT(", " );
1979 }
1980 switch(af<<8 | safi) {
1981 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1982 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1983 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1984 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1985 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1986 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1987 case (AFNUM_INET<<8 | SAFNUM_MDT):
1988 if (tlen < sizeof(nd_ipv4)) {
1989 ND_PRINT("invalid len");
1990 tlen = 0;
1991 } else {
1992 ND_TCHECK_LEN(tptr, sizeof(nd_ipv4));
1993 ND_PRINT("%s",ipaddr_string(ndo, tptr));
1994 tlen -= sizeof(nd_ipv4);
1995 tptr += sizeof(nd_ipv4);
1996 }
1997 break;
1998 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1999 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
2000 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
2001 if (tlen < sizeof(nd_ipv4)+BGP_VPN_RD_LEN) {
2002 ND_PRINT("invalid len");
2003 tlen = 0;
2004 } else {
2005 ND_TCHECK_LEN(tptr,
2006 sizeof(nd_ipv4) + BGP_VPN_RD_LEN);
2007 ND_PRINT("RD: %s, %s",
2008 bgp_vpn_rd_print(ndo, tptr),
2009 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN));
2010 tlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2011 tptr += (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
2012 }
2013 break;
2014 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
2015 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
2016 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
2017 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
2018 if (tlen < sizeof(nd_ipv6)) {
2019 ND_PRINT("invalid len");
2020 tlen = 0;
2021 } else {
2022 ND_TCHECK_LEN(tptr, sizeof(nd_ipv6));
2023 ND_PRINT("%s", ip6addr_string(ndo, tptr));
2024 tlen -= sizeof(nd_ipv6);
2025 tptr += sizeof(nd_ipv6);
2026 }
2027 break;
2028 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
2029 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
2030 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
2031 if (tlen < sizeof(nd_ipv6)+BGP_VPN_RD_LEN) {
2032 ND_PRINT("invalid len");
2033 tlen = 0;
2034 } else {
2035 ND_TCHECK_LEN(tptr,
2036 sizeof(nd_ipv6) + BGP_VPN_RD_LEN);
2037 ND_PRINT("RD: %s, %s",
2038 bgp_vpn_rd_print(ndo, tptr),
2039 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN));
2040 tlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2041 tptr += (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
2042 }
2043 break;
2044 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
2045 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2046 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2047 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2048 if (tlen < sizeof(nd_ipv4)) {
2049 ND_PRINT("invalid len");
2050 tlen = 0;
2051 } else {
2052 ND_TCHECK_LEN(tptr, sizeof(nd_ipv4));
2053 ND_PRINT("%s", ipaddr_string(ndo, tptr));
2054 tlen -= (sizeof(nd_ipv4));
2055 tptr += (sizeof(nd_ipv4));
2056 }
2057 break;
2058 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2059 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2060 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2061 ND_TCHECK_LEN(tptr, tlen);
2062 ND_PRINT("%s", isonsap_string(ndo, tptr, tlen));
2063 tptr += tlen;
2064 tlen = 0;
2065 break;
2066
2067 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2068 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2069 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2070 if (tlen < BGP_VPN_RD_LEN+1) {
2071 ND_PRINT("invalid len");
2072 tlen = 0;
2073 } else {
2074 ND_TCHECK_LEN(tptr, tlen);
2075 ND_PRINT("RD: %s, %s",
2076 bgp_vpn_rd_print(ndo, tptr),
2077 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN));
2078 /* rfc986 mapped IPv4 address ? */
2079 if (GET_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
2080 ND_PRINT(" = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4));
2081 /* rfc1888 mapped IPv6 address ? */
2082 else if (GET_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
2083 ND_PRINT(" = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3));
2084 tptr += tlen;
2085 tlen = 0;
2086 }
2087 break;
2088 default:
2089 /*
2090 * bgp_mp_af_print() should have saved us from
2091 * an unsupported AFI/SAFI.
2092 */
2093 ND_PRINT("ERROR: no AFI %u/SAFI %u nexthop decoder", af, safi);
2094 tptr += tlen;
2095 tlen = 0;
2096 goto done;
2097 break;
2098 }
2099 }
2100 }
2101 ND_PRINT(", nh-length: %u", nhlen);
2102 tptr += tlen;
2103
2104 ND_TCHECK_1(tptr);
2105 snpa = GET_U_1(tptr);
2106 tptr++;
2107
2108 if (snpa) {
2109 ND_PRINT("\n\t %u SNPA", snpa);
2110 for (/*nothing*/; snpa != 0; snpa--) {
2111 ND_TCHECK_1(tptr);
2112 ND_PRINT("\n\t %u bytes", GET_U_1(tptr));
2113 tptr += GET_U_1(tptr) + 1;
2114 }
2115 } else {
2116 ND_PRINT(", no SNPA");
2117 }
2118
2119 add_path4 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 32);
2120 add_path6 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 128);
2121
2122 while (tptr < pptr + len) {
2123 advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf),
2124 add_path4, add_path6);
2125 if (advance == -2)
2126 goto trunc;
2127 if (advance < 0)
2128 break;
2129 tptr += advance;
2130 }
2131 break;
2132
2133 case BGPTYPE_MP_UNREACH_NLRI:
2134 ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
2135 ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
2136 if (ret == -2)
2137 goto trunc;
2138 if (ret < 0)
2139 break;
2140
2141 if (len == BGP_MP_NLRI_MINSIZE)
2142 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2143
2144 tptr += 3;
2145
2146 add_path4 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 32);
2147 add_path6 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 128);
2148
2149 while (tptr < pptr + len) {
2150 advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf),
2151 add_path4, add_path6);
2152 if (advance == -2)
2153 goto trunc;
2154 if (advance < 0)
2155 break;
2156 tptr += advance;
2157 }
2158 break;
2159 case BGPTYPE_EXTD_COMMUNITIES:
2160 if (len % 8) {
2161 ND_PRINT("invalid len");
2162 break;
2163 }
2164 while (tlen != 0) {
2165 uint16_t extd_comm;
2166
2167 ND_TCHECK_2(tptr);
2168 if (tlen < 2)
2169 goto trunc;
2170 extd_comm=GET_BE_U_2(tptr);
2171
2172 ND_PRINT("\n\t %s (0x%04x), Flags [%s]",
2173 tok2str(bgp_extd_comm_subtype_values,
2174 "unknown extd community typecode",
2175 extd_comm),
2176 extd_comm,
2177 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm));
2178
2179 ND_TCHECK_8(tptr);
2180 if (tlen < 8)
2181 goto trunc;
2182 ND_PRINT(": ");
2183 bgp_extended_community_print(ndo, tptr);
2184 tlen -= 8;
2185 tptr += 8;
2186 }
2187 break;
2188
2189 case BGPTYPE_PMSI_TUNNEL:
2190 {
2191 uint8_t tunnel_type, flags;
2192
2193 ND_TCHECK_5(tptr);
2194 if (tlen < 5)
2195 goto trunc;
2196 flags = GET_U_1(tptr);
2197 tunnel_type = GET_U_1(tptr + 1);
2198 tlen = len;
2199
2200 ND_PRINT("\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2201 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2202 tunnel_type,
2203 bittok2str(bgp_pmsi_flag_values, "none", flags),
2204 GET_BE_U_3(tptr + 2)>>4);
2205
2206 tptr +=5;
2207 tlen -= 5;
2208
2209 switch (tunnel_type) {
2210 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2211 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2212 ND_TCHECK_8(tptr);
2213 ND_PRINT("\n\t Sender %s, P-Group %s",
2214 ipaddr_string(ndo, tptr),
2215 ipaddr_string(ndo, tptr+4));
2216 break;
2217
2218 case BGP_PMSI_TUNNEL_PIM_SSM:
2219 ND_TCHECK_8(tptr);
2220 ND_PRINT("\n\t Root-Node %s, P-Group %s",
2221 ipaddr_string(ndo, tptr),
2222 ipaddr_string(ndo, tptr+4));
2223 break;
2224 case BGP_PMSI_TUNNEL_INGRESS:
2225 ND_TCHECK_4(tptr);
2226 ND_PRINT("\n\t Tunnel-Endpoint %s",
2227 ipaddr_string(ndo, tptr));
2228 break;
2229 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2230 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2231 ND_TCHECK_8(tptr);
2232 ND_PRINT("\n\t Root-Node %s, LSP-ID 0x%08x",
2233 ipaddr_string(ndo, tptr),
2234 GET_BE_U_4(tptr + 4));
2235 break;
2236 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2237 ND_TCHECK_8(tptr);
2238 ND_PRINT("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2239 ipaddr_string(ndo, tptr),
2240 GET_BE_U_4(tptr + 4));
2241 break;
2242 default:
2243 if (ndo->ndo_vflag <= 1) {
2244 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2245 }
2246 }
2247 break;
2248 }
2249 case BGPTYPE_AIGP:
2250 {
2251 uint8_t type;
2252 uint16_t length;
2253
2254 tlen = len;
2255
2256 while (tlen >= 3) {
2257
2258 ND_TCHECK_3(tptr);
2259
2260 type = GET_U_1(tptr);
2261 length = GET_BE_U_2(tptr + 1);
2262 tptr += 3;
2263 tlen -= 3;
2264
2265 ND_PRINT("\n\t %s TLV (%u), length %u",
2266 tok2str(bgp_aigp_values, "Unknown", type),
2267 type, length);
2268
2269 if (length < 3)
2270 goto trunc;
2271 length -= 3;
2272
2273 /*
2274 * Check if we can read the TLV data.
2275 */
2276 ND_TCHECK_LEN(tptr + 3, length);
2277 if (tlen < length)
2278 goto trunc;
2279
2280 switch (type) {
2281
2282 case BGP_AIGP_TLV:
2283 if (length < 8)
2284 goto trunc;
2285 ND_PRINT(", metric %" PRIu64,
2286 GET_BE_U_8(tptr));
2287 break;
2288
2289 default:
2290 if (ndo->ndo_vflag <= 1) {
2291 print_unknown_data(ndo, tptr,"\n\t ", length);
2292 }
2293 }
2294
2295 tptr += length;
2296 tlen -= length;
2297 }
2298 break;
2299 }
2300 case BGPTYPE_ATTR_SET:
2301 ND_TCHECK_4(tptr);
2302 if (len < 4)
2303 goto trunc;
2304 ND_PRINT("\n\t Origin AS: %s",
2305 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)));
2306 tptr += 4;
2307 len -= 4;
2308
2309 while (len) {
2310 u_int aflags, alenlen, alen;
2311
2312 ND_TCHECK_2(tptr);
2313 if (len < 2) {
2314 ND_PRINT(" [path attr too short]");
2315 tptr += len;
2316 break;
2317 }
2318 aflags = GET_U_1(tptr);
2319 atype = GET_U_1(tptr + 1);
2320 tptr += 2;
2321 len -= 2;
2322 alenlen = bgp_attr_lenlen(aflags, tptr);
2323 ND_TCHECK_LEN(tptr, alenlen);
2324 if (len < alenlen) {
2325 ND_PRINT(" [path attr too short]");
2326 tptr += len;
2327 break;
2328 }
2329 alen = bgp_attr_len(aflags, tptr);
2330 tptr += alenlen;
2331 len -= alenlen;
2332
2333 ND_PRINT("\n\t %s (%u), length: %u",
2334 tok2str(bgp_attr_values,
2335 "Unknown Attribute", atype),
2336 atype,
2337 alen);
2338
2339 if (aflags) {
2340 ND_PRINT(", Flags [%s%s%s%s",
2341 aflags & 0x80 ? "O" : "",
2342 aflags & 0x40 ? "T" : "",
2343 aflags & 0x20 ? "P" : "",
2344 aflags & 0x10 ? "E" : "");
2345 if (aflags & 0xf)
2346 ND_PRINT("+%x", aflags & 0xf);
2347 ND_PRINT("]");
2348 }
2349 ND_PRINT(": ");
2350 if (len < alen) {
2351 ND_PRINT(" [path attr too short]");
2352 tptr += len;
2353 break;
2354 }
2355 /* FIXME check for recursion */
2356 if (!bgp_attr_print(ndo, atype, tptr, alen))
2357 return 0;
2358 tptr += alen;
2359 len -= alen;
2360 }
2361 break;
2362
2363 case BGPTYPE_LARGE_COMMUNITY:
2364 if (len == 0 || len % 12) {
2365 ND_PRINT("invalid len");
2366 break;
2367 }
2368 ND_PRINT("\n\t ");
2369 while (len != 0) {
2370 ND_TCHECK_LEN(tptr, 12);
2371 ND_PRINT("%u:%u:%u%s",
2372 GET_BE_U_4(tptr),
2373 GET_BE_U_4(tptr + 4),
2374 GET_BE_U_4(tptr + 8),
2375 (len > 12) ? ", " : "");
2376 tptr += 12;
2377 /*
2378 * len will always be a multiple of 12, as per the above,
2379 * so this will never underflow.
2380 */
2381 len -= 12;
2382 }
2383 break;
2384 default:
2385 ND_TCHECK_LEN(pptr, len);
2386 ND_PRINT("\n\t no Attribute %u decoder", atype); /* we have no decoder for the attribute */
2387 if (ndo->ndo_vflag <= 1)
2388 print_unknown_data(ndo, pptr, "\n\t ", len);
2389 break;
2390 }
2391 done:
2392 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2393 ND_TCHECK_LEN(pptr, len);
2394 print_unknown_data(ndo, pptr, "\n\t ", len);
2395 }
2396 return 1;
2397
2398 trunc:
2399 return 0;
2400 }
2401
2402 static void
2403 bgp_capabilities_print(netdissect_options *ndo,
2404 const u_char *opt, u_int caps_len)
2405 {
2406 u_int cap_type, cap_len, tcap_len, cap_offset;
2407 u_int i = 0;
2408
2409 while (i < caps_len) {
2410 ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
2411 cap_type=GET_U_1(opt + i);
2412 cap_len=GET_U_1(opt + i + 1);
2413 ND_PRINT("\n\t %s (%u), length: %u",
2414 tok2str(bgp_capcode_values, "Unknown", cap_type),
2415 cap_type,
2416 cap_len);
2417 ND_TCHECK_LEN(opt + 2 + i, cap_len);
2418 switch (cap_type) {
2419 case BGP_CAPCODE_MP:
2420 /* AFI (16 bits), Reserved (8 bits), SAFI (8 bits) */
2421 if (cap_len < 4) {
2422 ND_PRINT(" (too short, < 4)");
2423 return;
2424 }
2425 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u)",
2426 tok2str(af_values, "Unknown", GET_BE_U_2(opt + i + 2)),
2427 GET_BE_U_2(opt + i + 2),
2428 tok2str(bgp_safi_values, "Unknown", GET_U_1(opt + i + 5)),
2429 GET_U_1(opt + i + 5));
2430 break;
2431 case BGP_CAPCODE_ML:
2432 cap_offset = 2;
2433 tcap_len = cap_len;
2434 while (tcap_len >= 4) {
2435 ND_PRINT( "\n\t\tAFI %s (%u), SAFI %s (%u), Count: %u",
2436 tok2str(af_values, "Unknown",
2437 GET_BE_U_2(opt + i + cap_offset)),
2438 GET_BE_U_2(opt + i + cap_offset),
2439 tok2str(bgp_safi_values, "Unknown",
2440 GET_U_1(opt + i + cap_offset + 2)),
2441 GET_U_1(opt + i + cap_offset + 2),
2442 GET_U_1(opt + i + cap_offset + 3));
2443 tcap_len -= 4;
2444 cap_offset += 4;
2445 }
2446 break;
2447 case BGP_CAPCODE_RESTART:
2448 /* Restart Flags (4 bits), Restart Time in seconds (12 bits) */
2449 if (cap_len < 2) {
2450 ND_PRINT(" (too short, < 2)");
2451 return;
2452 }
2453 tcap_len=cap_len;
2454 ND_PRINT("\n\t\tRestart Flags: [%s], Restart Time %us",
2455 ((GET_U_1(opt + i + 2))&0x80) ? "R" : "none",
2456 GET_BE_U_2(opt + i + 2)&0xfff);
2457 tcap_len-=2;
2458 cap_offset=4;
2459 while(tcap_len>=4) {
2460 ND_PRINT("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2461 tok2str(af_values,"Unknown",
2462 GET_BE_U_2(opt + i + cap_offset)),
2463 GET_BE_U_2(opt + i + cap_offset),
2464 tok2str(bgp_safi_values,"Unknown",
2465 GET_U_1(opt + i + cap_offset + 2)),
2466 GET_U_1(opt + (i + cap_offset + 2)),
2467 ((GET_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" );
2468 tcap_len -= 4;
2469 cap_offset += 4;
2470 }
2471 break;
2472 case BGP_CAPCODE_RR:
2473 case BGP_CAPCODE_RR_CISCO:
2474 break;
2475 case BGP_CAPCODE_AS_NEW:
2476 /*
2477 * Extract the 4 byte AS number encoded.
2478 */
2479 if (cap_len < 4) {
2480 ND_PRINT(" (too short, < 4)");
2481 return;
2482 }
2483 ND_PRINT("\n\t\t 4 Byte AS %s",
2484 as_printf(ndo, astostr, sizeof(astostr),
2485 GET_BE_U_4(opt + i + 2)));
2486 break;
2487 case BGP_CAPCODE_ADD_PATH:
2488 if (cap_len == 0) {
2489 ND_PRINT(" (bogus)"); /* length */
2490 break;
2491 }
2492 tcap_len=cap_len;
2493 cap_offset=2;
2494 while (tcap_len != 0) {
2495 if (tcap_len < 4) {
2496 nd_print_invalid(ndo);
2497 break;
2498 }
2499 ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2500 tok2str(af_values,"Unknown",GET_BE_U_2(opt + i + cap_offset)),
2501 GET_BE_U_2(opt + i + cap_offset),
2502 tok2str(bgp_safi_values,"Unknown",GET_U_1(opt + i + cap_offset + 2)),
2503 GET_U_1(opt + (i + cap_offset + 2)),
2504 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",GET_U_1(opt + i + cap_offset + 3))
2505 );
2506 tcap_len -= 4;
2507 cap_offset += 4;
2508 }
2509 break;
2510 default:
2511 ND_PRINT("\n\t\tno decoder for Capability %u",
2512 cap_type);
2513 if (ndo->ndo_vflag <= 1)
2514 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2515 cap_len);
2516 break;
2517 }
2518 if (ndo->ndo_vflag > 1 && cap_len != 0) {
2519 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2520 }
2521 i += BGP_CAP_HEADER_SIZE + cap_len;
2522 }
2523 return;
2524
2525 trunc:
2526 nd_print_trunc(ndo);
2527 }
2528
2529 static void
2530 bgp_open_print(netdissect_options *ndo,
2531 const u_char *dat, u_int length)
2532 {
2533 const struct bgp_open *bgp_open_header;
2534 u_int optslen;
2535 const struct bgp_opt *bgpopt;
2536 const u_char *opt;
2537 u_int i;
2538
2539 ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
2540 if (length < BGP_OPEN_SIZE)
2541 goto trunc;
2542
2543 bgp_open_header = (const struct bgp_open *)dat;
2544
2545 ND_PRINT("\n\t Version %u, ",
2546 GET_U_1(bgp_open_header->bgpo_version));
2547 ND_PRINT("my AS %s, ",
2548 as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(bgp_open_header->bgpo_myas)));
2549 ND_PRINT("Holdtime %us, ",
2550 GET_BE_U_2(bgp_open_header->bgpo_holdtime));
2551 ND_PRINT("ID %s", ipaddr_string(ndo, bgp_open_header->bgpo_id));
2552 optslen = GET_U_1(bgp_open_header->bgpo_optlen);
2553 ND_PRINT("\n\t Optional parameters, length: %u", optslen);
2554
2555 opt = dat + BGP_OPEN_SIZE;
2556 length -= BGP_OPEN_SIZE;
2557
2558 i = 0;
2559 while (i < optslen) {
2560 uint8_t opt_type, opt_len;
2561
2562 ND_TCHECK_LEN(opt + i, BGP_OPT_SIZE);
2563 if (length < BGP_OPT_SIZE + i)
2564 goto trunc;
2565 bgpopt = (const struct bgp_opt *)(opt + i);
2566 opt_type = GET_U_1(bgpopt->bgpopt_type);
2567 opt_len = GET_U_1(bgpopt->bgpopt_len);
2568 if (BGP_OPT_SIZE + i + opt_len > optslen) {
2569 ND_PRINT("\n\t Option %u, length: %u, goes past the end of the options",
2570 opt_type, opt_len);
2571 break;
2572 }
2573
2574 ND_PRINT("\n\t Option %s (%u), length: %u",
2575 tok2str(bgp_opt_values,"Unknown",opt_type),
2576 opt_type,
2577 opt_len);
2578
2579 /* now let's decode the options we know*/
2580 switch(opt_type) {
2581
2582 case BGP_OPT_CAP:
2583 bgp_capabilities_print(ndo, opt + BGP_OPT_SIZE + i,
2584 opt_len);
2585 break;
2586
2587 case BGP_OPT_AUTH:
2588 default:
2589 ND_PRINT("\n\t no decoder for option %u",
2590 opt_type);
2591 break;
2592 }
2593 i += BGP_OPT_SIZE + opt_len;
2594 }
2595 return;
2596 trunc:
2597 nd_print_trunc(ndo);
2598 }
2599
2600 static void
2601 bgp_update_print(netdissect_options *ndo,
2602 const u_char *dat, u_int length)
2603 {
2604 const u_char *p;
2605 u_int withdrawn_routes_len;
2606 char buf[MAXHOSTNAMELEN + 100];
2607 int wpfx;
2608 u_int len;
2609 int i;
2610 int add_path;
2611 u_int path_id = 0;
2612
2613 ND_TCHECK_LEN(dat, BGP_SIZE);
2614 if (length < BGP_SIZE)
2615 goto trunc;
2616 p = dat + BGP_SIZE;
2617 length -= BGP_SIZE;
2618
2619 /* Unfeasible routes */
2620 ND_TCHECK_2(p);
2621 if (length < 2)
2622 goto trunc;
2623 withdrawn_routes_len = GET_BE_U_2(p);
2624 p += 2;
2625 length -= 2;
2626 if (withdrawn_routes_len > 1) {
2627 /*
2628 * Without keeping state from the original NLRI message,
2629 * it's not possible to tell if this a v4 or v6 route,
2630 * so only try to decode it if we're not v6 enabled.
2631 */
2632 ND_TCHECK_LEN(p, withdrawn_routes_len);
2633 if (length < withdrawn_routes_len)
2634 goto trunc;
2635 ND_PRINT("\n\t Withdrawn routes:");
2636 add_path = check_add_path(ndo, p, withdrawn_routes_len, 32);
2637 while (withdrawn_routes_len != 0) {
2638 if (add_path) {
2639 if (withdrawn_routes_len < 4) {
2640 p += withdrawn_routes_len;
2641 length -= withdrawn_routes_len;
2642 break;
2643 }
2644 path_id = GET_BE_U_4(p);
2645 p += 4;
2646 length -= 4;
2647 withdrawn_routes_len -= 4;
2648 }
2649 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
2650 if (wpfx == -1) {
2651 ND_PRINT("\n\t (illegal prefix length)");
2652 break;
2653 } else if (wpfx == -2)
2654 goto trunc;
2655 else if (wpfx == -3)
2656 goto trunc; /* bytes left, but not enough */
2657 else {
2658 ND_PRINT("\n\t %s", buf);
2659 if (add_path) {
2660 ND_PRINT(" Path Id: %u", path_id);
2661 }
2662 p += wpfx;
2663 length -= wpfx;
2664 withdrawn_routes_len -= wpfx;
2665 }
2666 }
2667 } else {
2668 ND_TCHECK_LEN(p, withdrawn_routes_len);
2669 if (length < withdrawn_routes_len)
2670 goto trunc;
2671 p += withdrawn_routes_len;
2672 length -= withdrawn_routes_len;
2673 }
2674
2675 ND_TCHECK_2(p);
2676 if (length < 2)
2677 goto trunc;
2678 len = GET_BE_U_2(p);
2679 p += 2;
2680 length -= 2;
2681
2682 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2683 /* No withdrawn routes, no path attributes, no NLRI */
2684 ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
2685 return;
2686 }
2687
2688 if (len) {
2689 /* do something more useful!*/
2690 while (len) {
2691 uint8_t aflags, atype, alenlen;
2692 uint16_t alen;
2693
2694 ND_TCHECK_2(p);
2695 if (length < 2)
2696 goto trunc;
2697 if (len < 2) {
2698 ND_PRINT("\n\t [path attrs too short]");
2699 p += len;
2700 length -= len;
2701 break;
2702 }
2703 aflags = GET_U_1(p);
2704 atype = GET_U_1(p + 1);
2705 p += 2;
2706 len -= 2;
2707 length -= 2;
2708 alenlen = bgp_attr_lenlen(aflags, p);
2709 ND_TCHECK_LEN(p, alenlen);
2710 if (length < alenlen)
2711 goto trunc;
2712 if (len < alenlen) {
2713 ND_PRINT("\n\t [path attrs too short]");
2714 p += len;
2715 length -= len;
2716 break;
2717 }
2718 alen = bgp_attr_len(aflags, p);
2719 p += alenlen;
2720 len -= alenlen;
2721 length -= alenlen;
2722
2723 ND_PRINT("\n\t %s (%u), length: %u",
2724 tok2str(bgp_attr_values, "Unknown Attribute", atype),
2725 atype,
2726 alen);
2727
2728 if (aflags) {
2729 ND_PRINT(", Flags [%s%s%s%s",
2730 aflags & 0x80 ? "O" : "",
2731 aflags & 0x40 ? "T" : "",
2732 aflags & 0x20 ? "P" : "",
2733 aflags & 0x10 ? "E" : "");
2734 if (aflags & 0xf)
2735 ND_PRINT("+%x", aflags & 0xf);
2736 ND_PRINT("]: ");
2737 }
2738 if (len < alen) {
2739 ND_PRINT(" [path attrs too short]");
2740 p += len;
2741 length -= len;
2742 break;
2743 }
2744 if (length < alen)
2745 goto trunc;
2746 if (!bgp_attr_print(ndo, atype, p, alen))
2747 goto trunc;
2748 p += alen;
2749 len -= alen;
2750 length -= alen;
2751 }
2752 }
2753
2754 if (length) {
2755 add_path = check_add_path(ndo, p, length, 32);
2756 ND_PRINT("\n\t Updated routes:");
2757 while (length != 0) {
2758 if (add_path) {
2759 ND_TCHECK_4(p);
2760 if (length < 4)
2761 goto trunc;
2762 path_id = GET_BE_U_4(p);
2763 p += 4;
2764 length -= 4;
2765 }
2766 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2767 if (i == -1) {
2768 ND_PRINT("\n\t (illegal prefix length)");
2769 break;
2770 } else if (i == -2)
2771 goto trunc;
2772 else if (i == -3)
2773 goto trunc; /* bytes left, but not enough */
2774 else {
2775 ND_PRINT("\n\t %s", buf);
2776 if (add_path) {
2777 ND_PRINT(" Path Id: %u", path_id);
2778 }
2779 p += i;
2780 length -= i;
2781 }
2782 }
2783 }
2784 return;
2785 trunc:
2786 nd_print_trunc(ndo);
2787 }
2788
2789 static void
2790 bgp_notification_print(netdissect_options *ndo,
2791 const u_char *dat, u_int length)
2792 {
2793 const struct bgp_notification *bgp_notification_header;
2794 const u_char *tptr;
2795 uint8_t bgpn_major, bgpn_minor;
2796 uint8_t shutdown_comm_length;
2797 uint8_t remainder_offset;
2798
2799 ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
2800 if (length<BGP_NOTIFICATION_SIZE)
2801 return;
2802
2803 bgp_notification_header = (const struct bgp_notification *)dat;
2804 bgpn_major = GET_U_1(bgp_notification_header->bgpn_major);
2805 bgpn_minor = GET_U_1(bgp_notification_header->bgpn_minor);
2806
2807 ND_PRINT(", %s (%u)",
2808 tok2str(bgp_notify_major_values, "Unknown Error",
2809 bgpn_major),
2810 bgpn_major);
2811
2812 switch (bgpn_major) {
2813
2814 case BGP_NOTIFY_MAJOR_MSG:
2815 ND_PRINT(", subcode %s (%u)",
2816 tok2str(bgp_notify_minor_msg_values, "Unknown",
2817 bgpn_minor),
2818 bgpn_minor);
2819 break;
2820 case BGP_NOTIFY_MAJOR_OPEN:
2821 ND_PRINT(", subcode %s (%u)",
2822 tok2str(bgp_notify_minor_open_values, "Unknown",
2823 bgpn_minor),
2824 bgpn_minor);
2825 break;
2826 case BGP_NOTIFY_MAJOR_UPDATE:
2827 ND_PRINT(", subcode %s (%u)",
2828 tok2str(bgp_notify_minor_update_values, "Unknown",
2829 bgpn_minor),
2830 bgpn_minor);
2831 break;
2832 case BGP_NOTIFY_MAJOR_FSM:
2833 ND_PRINT(" subcode %s (%u)",
2834 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2835 bgpn_minor),
2836 bgpn_minor);
2837 break;
2838 case BGP_NOTIFY_MAJOR_CAP:
2839 ND_PRINT(" subcode %s (%u)",
2840 tok2str(bgp_notify_minor_cap_values, "Unknown",
2841 bgpn_minor),
2842 bgpn_minor);
2843 break;
2844 case BGP_NOTIFY_MAJOR_CEASE:
2845 ND_PRINT(", subcode %s (%u)",
2846 tok2str(bgp_notify_minor_cease_values, "Unknown",
2847 bgpn_minor),
2848 bgpn_minor);
2849
2850 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2851 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2852 */
2853 if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2854 tptr = dat + BGP_NOTIFICATION_SIZE;
2855 ND_TCHECK_7(tptr);
2856 ND_PRINT(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2857 tok2str(af_values, "Unknown", GET_BE_U_2(tptr)),
2858 GET_BE_U_2(tptr),
2859 tok2str(bgp_safi_values, "Unknown", GET_U_1((tptr + 2))),
2860 GET_U_1((tptr + 2)),
2861 GET_BE_U_4(tptr + 3));
2862 }
2863 /*
2864 * draft-ietf-idr-shutdown describes a method to send a communication
2865 * intended for human consumption regarding the Administrative Shutdown
2866 */
2867 if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
2868 bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
2869 length >= BGP_NOTIFICATION_SIZE + 1) {
2870 tptr = dat + BGP_NOTIFICATION_SIZE;
2871 ND_TCHECK_1(tptr);
2872 shutdown_comm_length = GET_U_1(tptr);
2873 remainder_offset = 0;
2874 /* garbage, hexdump it all */
2875 if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN ||
2876 shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) {
2877 ND_PRINT(", invalid Shutdown Communication length");
2878 }
2879 else if (shutdown_comm_length == 0) {
2880 ND_PRINT(", empty Shutdown Communication");
2881 remainder_offset += 1;
2882 }
2883 /* a proper shutdown communication */
2884 else {
2885 ND_TCHECK_LEN(tptr + 1, shutdown_comm_length);
2886 ND_PRINT(", Shutdown Communication (length: %u): \"", shutdown_comm_length);
2887 (void)nd_printn(ndo, tptr+1, shutdown_comm_length, NULL);
2888 ND_PRINT("\"");
2889 remainder_offset += shutdown_comm_length + 1;
2890 }
2891 /* if there is trailing data, hexdump it */
2892 if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) {
2893 ND_PRINT(", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2894 hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2895 }
2896 }
2897 break;
2898 default:
2899 break;
2900 }
2901
2902 return;
2903 trunc:
2904 nd_print_trunc(ndo);
2905 }
2906
2907 static void
2908 bgp_route_refresh_print(netdissect_options *ndo,
2909 const u_char *pptr, u_int len)
2910 {
2911 const struct bgp_route_refresh *bgp_route_refresh_header;
2912
2913 ND_TCHECK_LEN(pptr, BGP_ROUTE_REFRESH_SIZE);
2914
2915 /* some little sanity checking */
2916 if (len<BGP_ROUTE_REFRESH_SIZE)
2917 return;
2918
2919 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2920
2921 ND_PRINT("\n\t AFI %s (%u), SAFI %s (%u)",
2922 tok2str(af_values,"Unknown",
2923 GET_BE_U_2(bgp_route_refresh_header->afi)),
2924 GET_BE_U_2(bgp_route_refresh_header->afi),
2925 tok2str(bgp_safi_values,"Unknown",
2926 GET_U_1(bgp_route_refresh_header->safi)),
2927 GET_U_1(bgp_route_refresh_header->safi));
2928
2929 if (ndo->ndo_vflag > 1) {
2930 ND_TCHECK_LEN(pptr, len);
2931 print_unknown_data(ndo, pptr, "\n\t ", len);
2932 }
2933
2934 return;
2935 trunc:
2936 nd_print_trunc(ndo);
2937 }
2938
2939 static int
2940 bgp_pdu_print(netdissect_options *ndo,
2941 const u_char *dat, u_int length)
2942 {
2943 const struct bgp *bgp_header;
2944 uint8_t bgp_type;
2945
2946 ND_TCHECK_LEN(dat, BGP_SIZE);
2947 bgp_header = (const struct bgp *)dat;
2948 bgp_type = GET_U_1(bgp_header->bgp_type);
2949
2950 ND_PRINT("\n\t%s Message (%u), length: %u",
2951 tok2str(bgp_msg_values, "Unknown", bgp_type),
2952 bgp_type,
2953 length);
2954
2955 switch (bgp_type) {
2956 case BGP_OPEN:
2957 bgp_open_print(ndo, dat, length);
2958 break;
2959 case BGP_UPDATE:
2960 bgp_update_print(ndo, dat, length);
2961 break;
2962 case BGP_NOTIFICATION:
2963 bgp_notification_print(ndo, dat, length);
2964 break;
2965 case BGP_KEEPALIVE:
2966 break;
2967 case BGP_ROUTE_REFRESH:
2968 bgp_route_refresh_print(ndo, dat, length);
2969 break;
2970 default:
2971 /* we have no decoder for the BGP message */
2972 ND_TCHECK_LEN(dat, length);
2973 ND_PRINT("\n\t no Message %u decoder", bgp_type);
2974 print_unknown_data(ndo, dat, "\n\t ", length);
2975 break;
2976 }
2977 return 1;
2978 trunc:
2979 nd_print_trunc(ndo);
2980 return 0;
2981 }
2982
2983 void
2984 bgp_print(netdissect_options *ndo,
2985 const u_char *dat, u_int length _U_)
2986 {
2987 const u_char *p;
2988 const u_char *ep = ndo->ndo_snapend;
2989 const u_char *start;
2990 const u_char marker[] = {
2991 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2992 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2993 };
2994 const struct bgp *bgp_header;
2995 uint16_t hlen;
2996
2997 ndo->ndo_protocol = "bgp";
2998 ND_PRINT(": BGP");
2999
3000 if (ndo->ndo_vflag < 1) /* lets be less chatty */
3001 return;
3002
3003 p = dat;
3004 start = p;
3005 while (p < ep) {
3006 if (!ND_TTEST_1(p))
3007 break;
3008 if (GET_U_1(p) != 0xff) {
3009 p++;
3010 continue;
3011 }
3012
3013 if (!ND_TTEST_LEN(p, sizeof(marker)))
3014 break;
3015 if (memcmp(p, marker, sizeof(marker)) != 0) {
3016 p++;
3017 continue;
3018 }
3019
3020 /* found BGP header */
3021 ND_TCHECK_LEN(p, BGP_SIZE);
3022 bgp_header = (const struct bgp *)p;
3023
3024 if (start != p)
3025 nd_print_trunc(ndo);
3026
3027 hlen = GET_BE_U_2(bgp_header->bgp_len);
3028 if (hlen < BGP_SIZE) {
3029 ND_PRINT("\nmessage length %u < %u", hlen, BGP_SIZE);
3030 nd_print_invalid(ndo);
3031 break;
3032 }
3033
3034 if (ND_TTEST_LEN(p, hlen)) {
3035 if (!bgp_pdu_print(ndo, p, hlen))
3036 return;
3037 p += hlen;
3038 start = p;
3039 } else {
3040 ND_PRINT("\n[|BGP %s]",
3041 tok2str(bgp_msg_values,
3042 "Unknown Message Type",
3043 GET_U_1(bgp_header->bgp_type)));
3044 break;
3045 }
3046 }
3047
3048 return;
3049
3050 trunc:
3051 nd_print_trunc(ndo);
3052 }
[mirror] the TCPdump network dissector