]> The Tcpdump Group git mirrors - tcpdump/blob - print-bgp.c
projects / tcpdump / blob
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
Merge branch 'master' into master
[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 #ifdef HAVE_CONFIG_H
36 #include "config.h"
37 #endif
38
39 #include <netdissect-stdinc.h>
40
41 #include <stdio.h>
42 #include <string.h>
43
44 #include "netdissect.h"
45 #include "addrtoname.h"
46 #include "extract.h"
47 #include "af.h"
48 #include "l2vpn.h"
49
50 struct bgp {
51 nd_byte bgp_marker[16];
52 nd_uint16_t bgp_len;
53 nd_uint8_t bgp_type;
54 };
55 #define BGP_SIZE 19 /* unaligned */
56
57 #define BGP_OPEN 1
58 #define BGP_UPDATE 2
59 #define BGP_NOTIFICATION 3
60 #define BGP_KEEPALIVE 4
61 #define BGP_ROUTE_REFRESH 5
62
63 static const struct tok bgp_msg_values[] = {
64 { BGP_OPEN, "Open"},
65 { BGP_UPDATE, "Update"},
66 { BGP_NOTIFICATION, "Notification"},
67 { BGP_KEEPALIVE, "Keepalive"},
68 { BGP_ROUTE_REFRESH, "Route Refresh"},
69 { 0, NULL}
70 };
71
72 struct bgp_open {
73 nd_byte bgpo_marker[16];
74 nd_uint16_t bgpo_len;
75 nd_uint8_t bgpo_type;
76 nd_uint8_t bgpo_version;
77 nd_uint16_t bgpo_myas;
78 nd_uint16_t bgpo_holdtime;
79 nd_uint32_t bgpo_id;
80 nd_uint8_t bgpo_optlen;
81 /* options should follow */
82 };
83 #define BGP_OPEN_SIZE 29 /* unaligned */
84
85 struct bgp_opt {
86 nd_uint8_t bgpopt_type;
87 nd_uint8_t bgpopt_len;
88 /* variable length */
89 };
90 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
91 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
92
93 struct bgp_notification {
94 nd_byte bgpn_marker[16];
95 nd_uint16_t bgpn_len;
96 nd_uint8_t bgpn_type;
97 nd_uint8_t bgpn_major;
98 nd_uint8_t bgpn_minor;
99 };
100 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
101
102 struct bgp_route_refresh {
103 nd_byte bgp_marker[16];
104 nd_uint16_t len;
105 nd_uint8_t type; /* No padding after this; afi is, in fact, not aligned */
106 nd_uint16_t afi;
107 nd_uint8_t res;
108 nd_uint8_t safi;
109 };
110 #define BGP_ROUTE_REFRESH_SIZE 23
111
112 #define bgp_attr_lenlen(flags, p) \
113 (((flags) & 0x10) ? 2 : 1)
114 #define bgp_attr_len(flags, p) \
115 (((flags) & 0x10) ? EXTRACT_BE_U_2(p) : EXTRACT_U_1(p))
116
117 #define BGPTYPE_ORIGIN 1
118 #define BGPTYPE_AS_PATH 2
119 #define BGPTYPE_NEXT_HOP 3
120 #define BGPTYPE_MULTI_EXIT_DISC 4
121 #define BGPTYPE_LOCAL_PREF 5
122 #define BGPTYPE_ATOMIC_AGGREGATE 6
123 #define BGPTYPE_AGGREGATOR 7
124 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
125 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */
126 #define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */
127 #define BGPTYPE_DPA 11 /* deprecated, draft-ietf-idr-bgp-dpa */
128 #define BGPTYPE_ADVERTISERS 12 /* deprecated RFC1863 */
129 #define BGPTYPE_RCID_PATH 13 /* deprecated RFC1863 */
130 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */
131 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */
132 #define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */
133 #define BGPTYPE_AS4_PATH 17 /* RFC6793 */
134 #define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */
135 #define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */
136 #define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */
137 #define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */
138 #define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */
139 #define BGPTYPE_AIGP 26 /* RFC7311 */
140 #define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */
141 #define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */
142 #define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */
143 #define BGPTYPE_ATTR_SET 128 /* RFC6368 */
144
145 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
146
147 static const struct tok bgp_attr_values[] = {
148 { BGPTYPE_ORIGIN, "Origin"},
149 { BGPTYPE_AS_PATH, "AS Path"},
150 { BGPTYPE_AS4_PATH, "AS4 Path"},
151 { BGPTYPE_NEXT_HOP, "Next Hop"},
152 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
153 { BGPTYPE_LOCAL_PREF, "Local Preference"},
154 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
155 { BGPTYPE_AGGREGATOR, "Aggregator"},
156 { BGPTYPE_AGGREGATOR4, "Aggregator4"},
157 { BGPTYPE_COMMUNITIES, "Community"},
158 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
159 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
160 { BGPTYPE_DPA, "DPA"},
161 { BGPTYPE_ADVERTISERS, "Advertisers"},
162 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"},
163 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
164 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
165 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
166 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
167 { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"},
168 { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"},
169 { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
170 { BGPTYPE_AIGP, "Accumulated IGP Metric"},
171 { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
172 { BGPTYPE_ENTROPY_LABEL, "Entropy Label"},
173 { BGPTYPE_LARGE_COMMUNITY, "Large Community"},
174 { BGPTYPE_ATTR_SET, "Attribute Set"},
175 { 255, "Reserved for development"},
176 { 0, NULL}
177 };
178
179 #define BGP_AS_SET 1
180 #define BGP_AS_SEQUENCE 2
181 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
182 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
183
184 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
185 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
186
187 static const struct tok bgp_as_path_segment_open_values[] = {
188 { BGP_AS_SEQUENCE, ""},
189 { BGP_AS_SET, "{ "},
190 { BGP_CONFED_AS_SEQUENCE, "( "},
191 { BGP_CONFED_AS_SET, "({ "},
192 { 0, NULL}
193 };
194
195 static const struct tok bgp_as_path_segment_close_values[] = {
196 { BGP_AS_SEQUENCE, ""},
197 { BGP_AS_SET, "}"},
198 { BGP_CONFED_AS_SEQUENCE, ")"},
199 { BGP_CONFED_AS_SET, "})"},
200 { 0, NULL}
201 };
202
203 #define BGP_OPT_AUTH 1
204 #define BGP_OPT_CAP 2
205
206 static const struct tok bgp_opt_values[] = {
207 { BGP_OPT_AUTH, "Authentication Information"},
208 { BGP_OPT_CAP, "Capabilities Advertisement"},
209 { 0, NULL}
210 };
211
212 #define BGP_CAPCODE_MP 1 /* RFC2858 */
213 #define BGP_CAPCODE_RR 2 /* RFC2918 */
214 #define BGP_CAPCODE_ORF 3 /* RFC5291 */
215 #define BGP_CAPCODE_MR 4 /* RFC3107 */
216 #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */
217 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */
218 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
219 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
220 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
221 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
222 #define BGP_CAPCODE_ENH_RR 70 /* draft-keyur-bgp-enhanced-route-refresh */
223 #define BGP_CAPCODE_RR_CISCO 128
224
225 static const struct tok bgp_capcode_values[] = {
226 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
227 { BGP_CAPCODE_RR, "Route Refresh"},
228 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
229 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
230 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
231 { BGP_CAPCODE_RESTART, "Graceful Restart"},
232 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
233 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
234 { BGP_CAPCODE_MULTISESS, "Multisession BGP"},
235 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
236 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
237 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
238 { 0, NULL}
239 };
240
241 #define BGP_NOTIFY_MAJOR_MSG 1
242 #define BGP_NOTIFY_MAJOR_OPEN 2
243 #define BGP_NOTIFY_MAJOR_UPDATE 3
244 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
245 #define BGP_NOTIFY_MAJOR_FSM 5
246 #define BGP_NOTIFY_MAJOR_CEASE 6
247 #define BGP_NOTIFY_MAJOR_CAP 7
248
249 static const struct tok bgp_notify_major_values[] = {
250 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
251 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
252 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
253 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
254 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
255 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
256 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"},
257 { 0, NULL}
258 };
259
260 /* draft-ietf-idr-cease-subcode-02 */
261 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
262 /* draft-ietf-idr-shutdown-07 */
263 #define BGP_NOTIFY_MINOR_CEASE_SHUT 2
264 #define BGP_NOTIFY_MINOR_CEASE_RESET 4
265 #define BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN 128
266 static const struct tok bgp_notify_minor_cease_values[] = {
267 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
268 { BGP_NOTIFY_MINOR_CEASE_SHUT, "Administrative Shutdown"},
269 { 3, "Peer Unconfigured"},
270 { BGP_NOTIFY_MINOR_CEASE_RESET, "Administrative Reset"},
271 { 5, "Connection Rejected"},
272 { 6, "Other Configuration Change"},
273 { 7, "Connection Collision Resolution"},
274 { 0, NULL}
275 };
276
277 static const struct tok bgp_notify_minor_msg_values[] = {
278 { 1, "Connection Not Synchronized"},
279 { 2, "Bad Message Length"},
280 { 3, "Bad Message Type"},
281 { 0, NULL}
282 };
283
284 static const struct tok bgp_notify_minor_open_values[] = {
285 { 1, "Unsupported Version Number"},
286 { 2, "Bad Peer AS"},
287 { 3, "Bad BGP Identifier"},
288 { 4, "Unsupported Optional Parameter"},
289 { 5, "Authentication Failure"},
290 { 6, "Unacceptable Hold Time"},
291 { 7, "Capability Message Error"},
292 { 0, NULL}
293 };
294
295 static const struct tok bgp_notify_minor_update_values[] = {
296 { 1, "Malformed Attribute List"},
297 { 2, "Unrecognized Well-known Attribute"},
298 { 3, "Missing Well-known Attribute"},
299 { 4, "Attribute Flags Error"},
300 { 5, "Attribute Length Error"},
301 { 6, "Invalid ORIGIN Attribute"},
302 { 7, "AS Routing Loop"},
303 { 8, "Invalid NEXT_HOP Attribute"},
304 { 9, "Optional Attribute Error"},
305 { 10, "Invalid Network Field"},
306 { 11, "Malformed AS_PATH"},
307 { 0, NULL}
308 };
309
310 static const struct tok bgp_notify_minor_fsm_values[] = {
311 { 0, "Unspecified Error"},
312 { 1, "In OpenSent State"},
313 { 2, "In OpenConfirm State"},
314 { 3, "In Established State"},
315 { 0, NULL }
316 };
317
318 static const struct tok bgp_notify_minor_cap_values[] = {
319 { 1, "Invalid Action Value" },
320 { 2, "Invalid Capability Length" },
321 { 3, "Malformed Capability Value" },
322 { 4, "Unsupported Capability Code" },
323 { 0, NULL }
324 };
325
326 static const struct tok bgp_origin_values[] = {
327 { 0, "IGP"},
328 { 1, "EGP"},
329 { 2, "Incomplete"},
330 { 0, NULL}
331 };
332
333 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1
334 #define BGP_PMSI_TUNNEL_LDP_P2MP 2
335 #define BGP_PMSI_TUNNEL_PIM_SSM 3
336 #define BGP_PMSI_TUNNEL_PIM_SM 4
337 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5
338 #define BGP_PMSI_TUNNEL_INGRESS 6
339 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7
340
341 static const struct tok bgp_pmsi_tunnel_values[] = {
342 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
343 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
344 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
345 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
346 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
347 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
348 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
349 { 0, NULL}
350 };
351
352 static const struct tok bgp_pmsi_flag_values[] = {
353 { 0x01, "Leaf Information required"},
354 { 0, NULL}
355 };
356
357 #define BGP_AIGP_TLV 1
358
359 static const struct tok bgp_aigp_values[] = {
360 { BGP_AIGP_TLV, "AIGP"},
361 { 0, NULL}
362 };
363
364 /* Subsequent address family identifier, RFC2283 section 7 */
365 #define SAFNUM_RES 0
366 #define SAFNUM_UNICAST 1
367 #define SAFNUM_MULTICAST 2
368 #define SAFNUM_UNIMULTICAST 3 /* deprecated now */
369 /* labeled BGP RFC3107 */
370 #define SAFNUM_LABUNICAST 4
371 /* RFC6514 */
372 #define SAFNUM_MULTICAST_VPN 5
373 /* draft-nalawade-kapoor-tunnel-safi */
374 #define SAFNUM_TUNNEL 64
375 /* RFC4761 */
376 #define SAFNUM_VPLS 65
377 /* RFC6037 */
378 #define SAFNUM_MDT 66
379 /* RFC4364 */
380 #define SAFNUM_VPNUNICAST 128
381 /* RFC6513 */
382 #define SAFNUM_VPNMULTICAST 129
383 #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */
384 /* RFC4684 */
385 #define SAFNUM_RT_ROUTING_INFO 132
386
387 #define BGP_VPN_RD_LEN 8
388
389 static const struct tok bgp_safi_values[] = {
390 { SAFNUM_RES, "Reserved"},
391 { SAFNUM_UNICAST, "Unicast"},
392 { SAFNUM_MULTICAST, "Multicast"},
393 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
394 { SAFNUM_LABUNICAST, "labeled Unicast"},
395 { SAFNUM_TUNNEL, "Tunnel"},
396 { SAFNUM_VPLS, "VPLS"},
397 { SAFNUM_MDT, "MDT"},
398 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
399 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
400 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
401 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
402 { SAFNUM_MULTICAST_VPN, "Multicast VPN"},
403 { 0, NULL }
404 };
405
406 /* well-known community */
407 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
408 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
409 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
410
411 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */
412 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
413 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
414 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
415 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
416 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
417 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
418 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
419 /* rfc2547 bgp-mpls-vpns */
420 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
421 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatibility */
422 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatibility */
423 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatibility */
424
425 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
426 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatibility */
427
428 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
429 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatibility */
430
431 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
432
433 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
434 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
435 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
436 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */
437
438 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */
439 #define BGP_EXT_COM_EIGRP_GEN 0x8800
440 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801
441 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
442 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803
443 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804
444 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
445
446 static const struct tok bgp_extd_comm_flag_values[] = {
447 { 0x8000, "vendor-specific"},
448 { 0x4000, "non-transitive"},
449 { 0, NULL},
450 };
451
452 static const struct tok bgp_extd_comm_subtype_values[] = {
453 { BGP_EXT_COM_RT_0, "target"},
454 { BGP_EXT_COM_RT_1, "target"},
455 { BGP_EXT_COM_RT_2, "target"},
456 { BGP_EXT_COM_RO_0, "origin"},
457 { BGP_EXT_COM_RO_1, "origin"},
458 { BGP_EXT_COM_RO_2, "origin"},
459 { BGP_EXT_COM_LINKBAND, "link-BW"},
460 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
461 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
462 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
463 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
464 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
465 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
466 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
467 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
468 { BGP_EXT_COM_L2INFO, "layer2-info"},
469 { BGP_EXT_COM_EIGRP_GEN , "eigrp-general-route (flag, tag)" },
470 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY , "eigrp-route-metric (AS, delay)" },
471 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW , "eigrp-route-metric (reliability, nexthop, bandwidth)" },
472 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU , "eigrp-route-metric (load, MTU)" },
473 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID , "eigrp-external-route (remote-AS, remote-ID)" },
474 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC , "eigrp-external-route (remote-proto, remote-metric)" },
475 { BGP_EXT_COM_SOURCE_AS, "source-AS" },
476 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
477 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
478 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
479 { 0, NULL},
480 };
481
482 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
483 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
484 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
485 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
486 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
487 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
488 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
489 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
490
491 static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
492 { BGP_OSPF_RTYPE_RTR, "Router" },
493 { BGP_OSPF_RTYPE_NET, "Network" },
494 { BGP_OSPF_RTYPE_SUM, "Summary" },
495 { BGP_OSPF_RTYPE_EXT, "External" },
496 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
497 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
498 { 0, NULL },
499 };
500
501 /* ADD-PATH Send/Receive field values */
502 static const struct tok bgp_add_path_recvsend[] = {
503 { 1, "Receive" },
504 { 2, "Send" },
505 { 3, "Both" },
506 { 0, NULL },
507 };
508
509 static char astostr[20];
510
511 /*
512 * as_printf
513 *
514 * Convert an AS number into a string and return string pointer.
515 *
516 * Depending on bflag is set or not, AS number is converted into ASDOT notation
517 * or plain number notation.
518 *
519 */
520 static char *
521 as_printf(netdissect_options *ndo,
522 char *str, int size, u_int asnum)
523 {
524 if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
525 snprintf(str, size, "%u", asnum);
526 } else {
527 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
528 }
529 return str;
530 }
531
532 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
533
534 int
535 decode_prefix4(netdissect_options *ndo,
536 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
537 {
538 struct in_addr addr;
539 u_int plen, plenbytes;
540
541 ND_TCHECK_1(pptr);
542 ITEMCHECK(1);
543 plen = EXTRACT_U_1(pptr);
544 if (32 < plen)
545 return -1;
546 itemlen -= 1;
547
548 memset(&addr, 0, sizeof(addr));
549 plenbytes = (plen + 7) / 8;
550 ND_TCHECK_LEN(pptr + 1, plenbytes);
551 ITEMCHECK(plenbytes);
552 memcpy(&addr, pptr + 1, plenbytes);
553 if (plen % 8) {
554 ((u_char *)&addr)[plenbytes - 1] &=
555 ((0xff00 >> (plen % 8)) & 0xff);
556 }
557 snprintf(buf, buflen, "%s/%d", ipaddr_string(ndo, &addr), plen);
558 return 1 + plenbytes;
559
560 trunc:
561 return -2;
562
563 badtlv:
564 return -3;
565 }
566
567 static int
568 decode_labeled_prefix4(netdissect_options *ndo,
569 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
570 {
571 struct in_addr addr;
572 u_int plen, plenbytes;
573
574 /* prefix length and label = 4 bytes */
575 ND_TCHECK_4(pptr);
576 ITEMCHECK(4);
577 plen = EXTRACT_U_1(pptr); /* get prefix length */
578
579 /* this is one of the weirdnesses of rfc3107
580 the label length (actually the label + COS bits)
581 is added to the prefix length;
582 we also do only read out just one label -
583 there is no real application for advertisement of
584 stacked labels in a single BGP message
585 */
586
587 if (24 > plen)
588 return -1;
589
590 plen-=24; /* adjust prefixlen - labellength */
591
592 if (32 < plen)
593 return -1;
594 itemlen -= 4;
595
596 memset(&addr, 0, sizeof(addr));
597 plenbytes = (plen + 7) / 8;
598 ND_TCHECK_LEN(pptr + 4, plenbytes);
599 ITEMCHECK(plenbytes);
600 memcpy(&addr, pptr + 4, plenbytes);
601 if (plen % 8) {
602 ((u_char *)&addr)[plenbytes - 1] &=
603 ((0xff00 >> (plen % 8)) & 0xff);
604 }
605 /* the label may get offsetted by 4 bits so lets shift it right */
606 snprintf(buf, buflen, "%s/%d, label:%u %s",
607 ipaddr_string(ndo, &addr),
608 plen,
609 EXTRACT_BE_U_3(pptr + 1)>>4,
610 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
611
612 return 4 + plenbytes;
613
614 trunc:
615 return -2;
616
617 badtlv:
618 return -3;
619 }
620
621 /*
622 * bgp_vpn_ip_print
623 *
624 * print an ipv4 or ipv6 address into a buffer dependend on address length.
625 */
626 static char *
627 bgp_vpn_ip_print(netdissect_options *ndo,
628 const u_char *pptr, u_int addr_length)
629 {
630
631 /* worst case string is s fully formatted v6 address */
632 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
633 char *pos = addr;
634
635 switch(addr_length) {
636 case (sizeof(struct in_addr) << 3): /* 32 */
637 ND_TCHECK_LEN(pptr, sizeof(struct in_addr));
638 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
639 break;
640 case (sizeof(struct in6_addr) << 3): /* 128 */
641 ND_TCHECK_LEN(pptr, sizeof(struct in6_addr));
642 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
643 break;
644 default:
645 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
646 break;
647 }
648 pos += strlen(pos);
649
650 trunc:
651 *(pos) = '\0';
652 return (addr);
653 }
654
655 /*
656 * bgp_vpn_sg_print
657 *
658 * print an multicast s,g entry into a buffer.
659 * the s,g entry is encoded like this.
660 *
661 * +-----------------------------------+
662 * | Multicast Source Length (1 octet) |
663 * +-----------------------------------+
664 * | Multicast Source (Variable) |
665 * +-----------------------------------+
666 * | Multicast Group Length (1 octet) |
667 * +-----------------------------------+
668 * | Multicast Group (Variable) |
669 * +-----------------------------------+
670 *
671 * return the number of bytes read from the wire.
672 */
673 static int
674 bgp_vpn_sg_print(netdissect_options *ndo,
675 const u_char *pptr, char *buf, u_int buflen)
676 {
677 uint8_t addr_length;
678 u_int total_length, offset;
679
680 total_length = 0;
681
682 /* Source address length, encoded in bits */
683 ND_TCHECK_1(pptr);
684 addr_length = EXTRACT_U_1(pptr);
685 pptr++;
686
687 /* Source address */
688 ND_TCHECK_LEN(pptr, (addr_length >> 3));
689 total_length += (addr_length >> 3) + 1;
690 offset = strlen(buf);
691 if (addr_length) {
692 snprintf(buf + offset, buflen - offset, ", Source %s",
693 bgp_vpn_ip_print(ndo, pptr, addr_length));
694 pptr += (addr_length >> 3);
695 }
696
697 /* Group address length, encoded in bits */
698 ND_TCHECK_1(pptr);
699 addr_length = EXTRACT_U_1(pptr);
700 pptr++;
701
702 /* Group address */
703 ND_TCHECK_LEN(pptr, (addr_length >> 3));
704 total_length += (addr_length >> 3) + 1;
705 offset = strlen(buf);
706 if (addr_length) {
707 snprintf(buf + offset, buflen - offset, ", Group %s",
708 bgp_vpn_ip_print(ndo, pptr, addr_length));
709 pptr += (addr_length >> 3);
710 }
711
712 trunc:
713 return (total_length);
714 }
715
716 /* RDs and RTs share the same semantics
717 * we use bgp_vpn_rd_print for
718 * printing route targets inside a NLRI */
719 char *
720 bgp_vpn_rd_print(netdissect_options *ndo,
721 const u_char *pptr)
722 {
723 /* allocate space for the largest possible string */
724 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
725 char *pos = rd;
726
727 /* ok lets load the RD format */
728 switch (EXTRACT_BE_U_2(pptr)) {
729
730 /* 2-byte-AS:number fmt*/
731 case 0:
732 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
733 EXTRACT_BE_U_2(pptr + 2),
734 EXTRACT_BE_U_4(pptr + 4),
735 EXTRACT_U_1(pptr + 4), EXTRACT_U_1(pptr + 5),
736 EXTRACT_U_1(pptr + 6), EXTRACT_U_1(pptr + 7));
737 break;
738 /* IP-address:AS fmt*/
739
740 case 1:
741 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
742 EXTRACT_U_1(pptr + 2), EXTRACT_U_1(pptr + 3),
743 EXTRACT_U_1(pptr + 4), EXTRACT_U_1(pptr + 5),
744 EXTRACT_BE_U_2(pptr + 6));
745 break;
746
747 /* 4-byte-AS:number fmt*/
748 case 2:
749 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
750 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(pptr + 2)),
751 EXTRACT_BE_U_2(pptr + 6), EXTRACT_U_1(pptr + 2),
752 EXTRACT_U_1(pptr + 3), EXTRACT_U_1(pptr + 4),
753 EXTRACT_U_1(pptr + 5), EXTRACT_BE_U_2(pptr + 6));
754 break;
755 default:
756 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
757 break;
758 }
759 pos += strlen(pos);
760 *(pos) = '\0';
761 return (rd);
762 }
763
764 static int
765 decode_rt_routing_info(netdissect_options *ndo,
766 const u_char *pptr, char *buf, u_int buflen)
767 {
768 uint8_t route_target[8];
769 u_int plen;
770 char asbuf[sizeof(astostr)]; /* bgp_vpn_rd_print() overwrites astostr */
771
772 /* NLRI "prefix length" from RFC 2858 Section 4. */
773 ND_TCHECK_1(pptr);
774 plen = EXTRACT_U_1(pptr); /* get prefix length */
775
776 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
777 * RFC 4684 Section 4 defines the layout of "origin AS" and "route
778 * target" fields inside the "prefix" depending on its length.
779 */
780 if (0 == plen) {
781 /* Without "origin AS", without "route target". */
782 snprintf(buf, buflen, "default route target");
783 return 1;
784 }
785
786 if (32 > plen)
787 return -1;
788
789 /* With at least "origin AS", possibly with "route target". */
790 ND_TCHECK_4(pptr + 1);
791 as_printf(ndo, asbuf, sizeof(asbuf), EXTRACT_BE_U_4(pptr + 1));
792
793 plen-=32; /* adjust prefix length */
794
795 if (64 < plen)
796 return -1;
797
798 /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 }
799 * and gives the number of octets in the variable-length "route
800 * target" field inside this NLRI "prefix". Look for it.
801 */
802 memset(&route_target, 0, sizeof(route_target));
803 ND_TCHECK_LEN(pptr + 5, (plen + 7) / 8);
804 memcpy(&route_target, pptr + 5, (plen + 7) / 8);
805 /* Which specification says to do this? */
806 if (plen % 8) {
807 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
808 ((0xff00 >> (plen % 8)) & 0xff);
809 }
810 snprintf(buf, buflen, "origin AS: %s, route target %s",
811 asbuf,
812 bgp_vpn_rd_print(ndo, (u_char *)&route_target));
813
814 return 5 + (plen + 7) / 8;
815
816 trunc:
817 return -2;
818 }
819
820 static int
821 decode_labeled_vpn_prefix4(netdissect_options *ndo,
822 const u_char *pptr, char *buf, u_int buflen)
823 {
824 struct in_addr addr;
825 u_int plen;
826
827 ND_TCHECK_1(pptr);
828 plen = EXTRACT_U_1(pptr); /* get prefix length */
829
830 if ((24+64) > plen)
831 return -1;
832
833 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
834
835 if (32 < plen)
836 return -1;
837
838 memset(&addr, 0, sizeof(addr));
839 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
840 memcpy(&addr, pptr + 12, (plen + 7) / 8);
841 if (plen % 8) {
842 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
843 ((0xff00 >> (plen % 8)) & 0xff);
844 }
845 /* the label may get offsetted by 4 bits so lets shift it right */
846 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
847 bgp_vpn_rd_print(ndo, pptr+4),
848 ipaddr_string(ndo, &addr),
849 plen,
850 EXTRACT_BE_U_3(pptr + 1)>>4,
851 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
852
853 return 12 + (plen + 7) / 8;
854
855 trunc:
856 return -2;
857 }
858
859 /*
860 * +-------------------------------+
861 * | |
862 * | RD:IPv4-address (12 octets) |
863 * | |
864 * +-------------------------------+
865 * | MDT Group-address (4 octets) |
866 * +-------------------------------+
867 */
868
869 #define MDT_VPN_NLRI_LEN 16
870
871 static int
872 decode_mdt_vpn_nlri(netdissect_options *ndo,
873 const u_char *pptr, char *buf, u_int buflen)
874 {
875
876 const u_char *rd;
877 const u_char *vpn_ip;
878
879 ND_TCHECK_1(pptr);
880
881 /* if the NLRI is not predefined length, quit.*/
882 if (EXTRACT_U_1(pptr) != MDT_VPN_NLRI_LEN * 8)
883 return -1;
884 pptr++;
885
886 /* RD */
887 ND_TCHECK_8(pptr);
888 rd = pptr;
889 pptr+=8;
890
891 /* IPv4 address */
892 ND_TCHECK_LEN(pptr, sizeof(struct in_addr));
893 vpn_ip = pptr;
894 pptr+=sizeof(struct in_addr);
895
896 /* MDT Group Address */
897 ND_TCHECK_LEN(pptr, sizeof(struct in_addr));
898
899 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
900 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
901
902 return MDT_VPN_NLRI_LEN + 1;
903
904 trunc:
905
906 return -2;
907 }
908
909 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
910 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
911 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
912 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
913 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
914 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
915 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
916
917 static const struct tok bgp_multicast_vpn_route_type_values[] = {
918 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
919 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
920 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
921 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
922 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
923 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
924 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
925 { 0, NULL}
926 };
927
928 static int
929 decode_multicast_vpn(netdissect_options *ndo,
930 const u_char *pptr, char *buf, u_int buflen)
931 {
932 uint8_t route_type, route_length, addr_length, sg_length;
933 u_int offset;
934
935 ND_TCHECK_2(pptr);
936 route_type = EXTRACT_U_1(pptr);
937 pptr++;
938 route_length = EXTRACT_U_1(pptr);
939 pptr++;
940
941 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
942 tok2str(bgp_multicast_vpn_route_type_values,
943 "Unknown", route_type),
944 route_type, route_length);
945
946 switch(route_type) {
947 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
948 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
949 offset = strlen(buf);
950 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
951 bgp_vpn_rd_print(ndo, pptr),
952 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
953 (route_length - BGP_VPN_RD_LEN) << 3));
954 break;
955 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
956 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
957 offset = strlen(buf);
958 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
959 bgp_vpn_rd_print(ndo, pptr),
960 as_printf(ndo, astostr, sizeof(astostr),
961 EXTRACT_BE_U_4(pptr + BGP_VPN_RD_LEN)));
962 break;
963
964 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
965 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
966 offset = strlen(buf);
967 snprintf(buf + offset, buflen - offset, ", RD: %s",
968 bgp_vpn_rd_print(ndo, pptr));
969 pptr += BGP_VPN_RD_LEN;
970
971 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
972 addr_length = route_length - sg_length;
973
974 ND_TCHECK_LEN(pptr, addr_length);
975 offset = strlen(buf);
976 snprintf(buf + offset, buflen - offset, ", Originator %s",
977 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
978 break;
979
980 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
981 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
982 offset = strlen(buf);
983 snprintf(buf + offset, buflen - offset, ", RD: %s",
984 bgp_vpn_rd_print(ndo, pptr));
985 pptr += BGP_VPN_RD_LEN;
986
987 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
988 break;
989
990 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
991 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
992 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
993 offset = strlen(buf);
994 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
995 bgp_vpn_rd_print(ndo, pptr),
996 as_printf(ndo, astostr, sizeof(astostr),
997 EXTRACT_BE_U_4(pptr + BGP_VPN_RD_LEN)));
998 pptr += BGP_VPN_RD_LEN + 4;
999
1000 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1001 break;
1002
1003 /*
1004 * no per route-type printing yet.
1005 */
1006 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
1007 default:
1008 break;
1009 }
1010
1011 return route_length + 2;
1012
1013 trunc:
1014 return -2;
1015 }
1016
1017 /*
1018 * As I remember, some versions of systems have an snprintf() that
1019 * returns -1 if the buffer would have overflowed. If the return
1020 * value is negative, set buflen to 0, to indicate that we've filled
1021 * the buffer up.
1022 *
1023 * If the return value is greater than buflen, that means that
1024 * the buffer would have overflowed; again, set buflen to 0 in
1025 * that case.
1026 */
1027 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1028 if (stringlen<0) \
1029 buflen=0; \
1030 else if ((u_int)stringlen>buflen) \
1031 buflen=0; \
1032 else { \
1033 buflen-=stringlen; \
1034 buf+=stringlen; \
1035 }
1036
1037 static int
1038 decode_labeled_vpn_l2(netdissect_options *ndo,
1039 const u_char *pptr, char *buf, u_int buflen)
1040 {
1041 int plen,tlen,stringlen,tlv_type,tlv_len,ttlv_len;
1042
1043 ND_TCHECK_2(pptr);
1044 plen=EXTRACT_BE_U_2(pptr);
1045 tlen=plen;
1046 pptr+=2;
1047 /* Old and new L2VPN NLRI share AFI/SAFI
1048 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1049 * and > 17 as old format. Complain for the middle case
1050 */
1051 if (plen==12) {
1052 /* assume AD-only with RD, BGPNH */
1053 ND_TCHECK_LEN(pptr, 12);
1054 buf[0]='\0';
1055 stringlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1056 bgp_vpn_rd_print(ndo, pptr),
1057 ipaddr_string(ndo, pptr+8)
1058 );
1059 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1060 pptr+=12;
1061 tlen-=12;
1062 return plen;
1063 } else if (plen>17) {
1064 /* assume old format */
1065 /* RD, ID, LBLKOFF, LBLBASE */
1066
1067 ND_TCHECK_LEN(pptr, 15);
1068 buf[0]='\0';
1069 stringlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1070 bgp_vpn_rd_print(ndo, pptr),
1071 EXTRACT_BE_U_2(pptr + 8),
1072 EXTRACT_BE_U_2(pptr + 10),
1073 EXTRACT_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1074 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1075 pptr+=15;
1076 tlen-=15;
1077
1078 /* ok now the variable part - lets read out TLVs*/
1079 while (tlen>0) {
1080 if (tlen < 3)
1081 return -1;
1082 ND_TCHECK_3(pptr);
1083 tlv_type=EXTRACT_U_1(pptr);
1084 pptr++;
1085 tlv_len=EXTRACT_BE_U_2(pptr);
1086 ttlv_len=tlv_len;
1087 pptr+=2;
1088
1089 switch(tlv_type) {
1090 case 1:
1091 if (buflen!=0) {
1092 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1093 tlv_type,
1094 tlv_len);
1095 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1096 }
1097 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
1098 while (ttlv_len>0) {
1099 ND_TCHECK_1(pptr);
1100 if (buflen!=0) {
1101 stringlen=snprintf(buf,buflen, "%02x",
1102 EXTRACT_U_1(pptr));
1103 pptr++;
1104 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1105 }
1106 ttlv_len--;
1107 }
1108 break;
1109 default:
1110 if (buflen!=0) {
1111 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1112 tlv_type,
1113 tlv_len);
1114 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1115 }
1116 break;
1117 }
1118 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
1119 }
1120 return plen+2;
1121
1122 } else {
1123 /* complain bitterly ? */
1124 /* fall through */
1125 goto trunc;
1126 }
1127
1128 trunc:
1129 return -2;
1130 }
1131
1132 int
1133 decode_prefix6(netdissect_options *ndo,
1134 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1135 {
1136 struct in6_addr addr;
1137 u_int plen, plenbytes;
1138
1139 ND_TCHECK_1(pd);
1140 ITEMCHECK(1);
1141 plen = EXTRACT_U_1(pd);
1142 if (128 < plen)
1143 return -1;
1144 itemlen -= 1;
1145
1146 memset(&addr, 0, sizeof(addr));
1147 plenbytes = (plen + 7) / 8;
1148 ND_TCHECK_LEN(pd + 1, plenbytes);
1149 ITEMCHECK(plenbytes);
1150 memcpy(&addr, pd + 1, plenbytes);
1151 if (plen % 8) {
1152 addr.s6_addr[plenbytes - 1] &=
1153 ((0xff00 >> (plen % 8)) & 0xff);
1154 }
1155 snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen);
1156 return 1 + plenbytes;
1157
1158 trunc:
1159 return -2;
1160
1161 badtlv:
1162 return -3;
1163 }
1164
1165 static int
1166 decode_labeled_prefix6(netdissect_options *ndo,
1167 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1168 {
1169 struct in6_addr addr;
1170 u_int plen, plenbytes;
1171
1172 /* prefix length and label = 4 bytes */
1173 ND_TCHECK_4(pptr);
1174 ITEMCHECK(4);
1175 plen = EXTRACT_U_1(pptr); /* get prefix length */
1176
1177 if (24 > plen)
1178 return -1;
1179
1180 plen-=24; /* adjust prefixlen - labellength */
1181
1182 if (128 < plen)
1183 return -1;
1184 itemlen -= 4;
1185
1186 memset(&addr, 0, sizeof(addr));
1187 plenbytes = (plen + 7) / 8;
1188 ND_TCHECK_LEN(pptr + 4, plenbytes);
1189 memcpy(&addr, pptr + 4, plenbytes);
1190 if (plen % 8) {
1191 addr.s6_addr[plenbytes - 1] &=
1192 ((0xff00 >> (plen % 8)) & 0xff);
1193 }
1194 /* the label may get offsetted by 4 bits so lets shift it right */
1195 snprintf(buf, buflen, "%s/%d, label:%u %s",
1196 ip6addr_string(ndo, &addr),
1197 plen,
1198 EXTRACT_BE_U_3(pptr + 1)>>4,
1199 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1200
1201 return 4 + plenbytes;
1202
1203 trunc:
1204 return -2;
1205
1206 badtlv:
1207 return -3;
1208 }
1209
1210 static int
1211 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1212 const u_char *pptr, char *buf, u_int buflen)
1213 {
1214 struct in6_addr addr;
1215 u_int plen;
1216
1217 ND_TCHECK_1(pptr);
1218 plen = EXTRACT_U_1(pptr); /* get prefix length */
1219
1220 if ((24+64) > plen)
1221 return -1;
1222
1223 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1224
1225 if (128 < plen)
1226 return -1;
1227
1228 memset(&addr, 0, sizeof(addr));
1229 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1230 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1231 if (plen % 8) {
1232 addr.s6_addr[(plen + 7) / 8 - 1] &=
1233 ((0xff00 >> (plen % 8)) & 0xff);
1234 }
1235 /* the label may get offsetted by 4 bits so lets shift it right */
1236 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1237 bgp_vpn_rd_print(ndo, pptr+4),
1238 ip6addr_string(ndo, &addr),
1239 plen,
1240 EXTRACT_BE_U_3(pptr + 1)>>4,
1241 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1242
1243 return 12 + (plen + 7) / 8;
1244
1245 trunc:
1246 return -2;
1247 }
1248
1249 static int
1250 decode_clnp_prefix(netdissect_options *ndo,
1251 const u_char *pptr, char *buf, u_int buflen)
1252 {
1253 uint8_t addr[19];
1254 u_int plen;
1255
1256 ND_TCHECK_1(pptr);
1257 plen = EXTRACT_U_1(pptr); /* get prefix length */
1258
1259 if (152 < plen)
1260 return -1;
1261
1262 memset(&addr, 0, sizeof(addr));
1263 ND_TCHECK_LEN(pptr + 4, (plen + 7) / 8);
1264 memcpy(&addr, pptr + 4, (plen + 7) / 8);
1265 if (plen % 8) {
1266 addr[(plen + 7) / 8 - 1] &=
1267 ((0xff00 >> (plen % 8)) & 0xff);
1268 }
1269 snprintf(buf, buflen, "%s/%d",
1270 isonsap_string(ndo, addr,(plen + 7) / 8),
1271 plen);
1272
1273 return 1 + (plen + 7) / 8;
1274
1275 trunc:
1276 return -2;
1277 }
1278
1279 static int
1280 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1281 const u_char *pptr, char *buf, u_int buflen)
1282 {
1283 uint8_t addr[19];
1284 u_int plen;
1285
1286 ND_TCHECK_1(pptr);
1287 plen = EXTRACT_U_1(pptr); /* get prefix length */
1288
1289 if ((24+64) > plen)
1290 return -1;
1291
1292 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1293
1294 if (152 < plen)
1295 return -1;
1296
1297 memset(&addr, 0, sizeof(addr));
1298 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1299 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1300 if (plen % 8) {
1301 addr[(plen + 7) / 8 - 1] &=
1302 ((0xff00 >> (plen % 8)) & 0xff);
1303 }
1304 /* the label may get offsetted by 4 bits so lets shift it right */
1305 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1306 bgp_vpn_rd_print(ndo, pptr+4),
1307 isonsap_string(ndo, addr,(plen + 7) / 8),
1308 plen,
1309 EXTRACT_BE_U_3(pptr + 1)>>4,
1310 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1311
1312 return 12 + (plen + 7) / 8;
1313
1314 trunc:
1315 return -2;
1316 }
1317
1318 /*
1319 * bgp_attr_get_as_size
1320 *
1321 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1322 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1323 * support, exchange AS-Path with the same path-attribute type value 0x02.
1324 */
1325 static int
1326 bgp_attr_get_as_size(netdissect_options *ndo,
1327 uint8_t bgpa_type, const u_char *pptr, int len)
1328 {
1329 const u_char *tptr = pptr;
1330
1331 /*
1332 * If the path attribute is the optional AS4 path type, then we already
1333 * know, that ASs must be encoded in 4 byte format.
1334 */
1335 if (bgpa_type == BGPTYPE_AS4_PATH) {
1336 return 4;
1337 }
1338
1339 /*
1340 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1341 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1342 * each.
1343 */
1344 while (tptr < pptr + len) {
1345 ND_TCHECK_1(tptr);
1346
1347 /*
1348 * If we do not find a valid segment type, our guess might be wrong.
1349 */
1350 if (EXTRACT_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || EXTRACT_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
1351 goto trunc;
1352 }
1353 ND_TCHECK_1(tptr + 1);
1354 tptr += 2 + EXTRACT_U_1(tptr + 1) * 2;
1355 }
1356
1357 /*
1358 * If we correctly reached end of the AS path attribute data content,
1359 * then most likely ASs were indeed encoded as 2 bytes.
1360 */
1361 if (tptr == pptr + len) {
1362 return 2;
1363 }
1364
1365 trunc:
1366
1367 /*
1368 * We can come here, either we did not have enough data, or if we
1369 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1370 * so that calller can try to decode each AS as of 4 bytes. If indeed
1371 * there was not enough data, it will crib and end the parse anyways.
1372 */
1373 return 4;
1374 }
1375
1376 /*
1377 * The only way to know that a BGP UPDATE message is using add path is
1378 * by checking if the capability is in the OPEN message which we may have missed.
1379 * So this function checks if it is possible that the update could contain add path
1380 * and if so it checks that standard BGP doesn't make sense.
1381 */
1382
1383 static int
1384 check_add_path(const u_char *pptr, u_int length, u_int max_prefix_length) {
1385
1386 u_int offset, prefix_length;
1387 if (length < 5) {
1388 return 0;
1389 }
1390
1391 /* check if it could be add path */
1392 for(offset = 0; offset < length;) {
1393 offset += 4;
1394 prefix_length = pptr[offset];
1395 /*
1396 * Add 4 to cover the path id
1397 * and check the prefix length isn't greater than 32/128.
1398 */
1399 if (prefix_length > max_prefix_length) {
1400 return 0;
1401 }
1402 /* Add 1 for the prefix_length byte and prefix_length to cover the address */
1403 offset += 1 + ((prefix_length + 7) / 8);
1404 }
1405 /* check we haven't gone past the end of the section */
1406 if (offset > length) {
1407 return 0;
1408 }
1409
1410 /* check it's not standard BGP */
1411 for(offset = 0; offset < length; ) {
1412 prefix_length = pptr[offset];
1413 /*
1414 * If the prefix_length is zero (0.0.0.0/0)
1415 * and since it's not the only address (length >= 5)
1416 * then it is add-path
1417 */
1418 if (prefix_length < 1 || prefix_length > max_prefix_length) {
1419 return 1;
1420 }
1421 offset += 1 + ((prefix_length + 7) / 8);
1422 }
1423 if (offset > length) {
1424 return 1;
1425 }
1426
1427 /* assume not add-path by default */
1428 return 0;
1429 }
1430
1431
1432 static int
1433 bgp_attr_print(netdissect_options *ndo,
1434 u_int atype, const u_char *pptr, u_int len)
1435 {
1436 int i;
1437 uint16_t af;
1438 uint8_t safi, snpa, nhlen;
1439 union { /* copy buffer for bandwidth values */
1440 float f;
1441 uint32_t i;
1442 } bw;
1443 int advance;
1444 u_int tlen;
1445 const u_char *tptr;
1446 char buf[MAXHOSTNAMELEN + 100];
1447 int as_size;
1448 int add_path4, add_path6, path_id;
1449
1450 tptr = pptr;
1451 tlen=len;
1452
1453 switch (atype) {
1454 case BGPTYPE_ORIGIN:
1455 if (len != 1)
1456 ND_PRINT((ndo, "invalid len"));
1457 else {
1458 ND_TCHECK_1(tptr);
1459 ND_PRINT((ndo, "%s", tok2str(bgp_origin_values,
1460 "Unknown Origin Typecode",
1461 EXTRACT_U_1(tptr))));
1462 }
1463 break;
1464
1465 /*
1466 * Process AS4 byte path and AS2 byte path attributes here.
1467 */
1468 case BGPTYPE_AS4_PATH:
1469 case BGPTYPE_AS_PATH:
1470 if (len % 2) {
1471 ND_PRINT((ndo, "invalid len"));
1472 break;
1473 }
1474 if (!len) {
1475 ND_PRINT((ndo, "empty"));
1476 break;
1477 }
1478
1479 /*
1480 * BGP updates exchanged between New speakers that support 4
1481 * byte AS, ASs are always encoded in 4 bytes. There is no
1482 * definitive way to find this, just by the packet's
1483 * contents. So, check for packet's TLV's sanity assuming
1484 * 2 bytes first, and it does not pass, assume that ASs are
1485 * encoded in 4 bytes format and move on.
1486 */
1487 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1488
1489 while (tptr < pptr + len) {
1490 ND_TCHECK_1(tptr);
1491 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values,
1492 "?", EXTRACT_U_1(tptr))));
1493 ND_TCHECK_1(tptr + 1);
1494 for (i = 0; i < tptr[1] * as_size; i += as_size) {
1495 ND_TCHECK_LEN(tptr + 2 + i, as_size);
1496 ND_PRINT((ndo, "%s ",
1497 as_printf(ndo, astostr, sizeof(astostr),
1498 as_size == 2 ?
1499 EXTRACT_BE_U_2(tptr + i + 2) :
1500 EXTRACT_BE_U_4(tptr + i + 2))));
1501 }
1502 ND_TCHECK_1(tptr);
1503 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values,
1504 "?", EXTRACT_U_1(tptr))));
1505 ND_TCHECK_1(tptr + 1);
1506 tptr += 2 + EXTRACT_U_1(tptr + 1) * as_size;
1507 }
1508 break;
1509 case BGPTYPE_NEXT_HOP:
1510 if (len != 4)
1511 ND_PRINT((ndo, "invalid len"));
1512 else {
1513 ND_TCHECK_4(tptr);
1514 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1515 }
1516 break;
1517 case BGPTYPE_MULTI_EXIT_DISC:
1518 case BGPTYPE_LOCAL_PREF:
1519 if (len != 4)
1520 ND_PRINT((ndo, "invalid len"));
1521 else {
1522 ND_TCHECK_4(tptr);
1523 ND_PRINT((ndo, "%u", EXTRACT_BE_U_4(tptr)));
1524 }
1525 break;
1526 case BGPTYPE_ATOMIC_AGGREGATE:
1527 if (len != 0)
1528 ND_PRINT((ndo, "invalid len"));
1529 break;
1530 case BGPTYPE_AGGREGATOR:
1531
1532 /*
1533 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1534 * the length of this PA can be either 6 bytes or 8 bytes.
1535 */
1536 if (len != 6 && len != 8) {
1537 ND_PRINT((ndo, "invalid len"));
1538 break;
1539 }
1540 ND_TCHECK_LEN(tptr, len);
1541 if (len == 6) {
1542 ND_PRINT((ndo, " AS #%s, origin %s",
1543 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(tptr)),
1544 ipaddr_string(ndo, tptr + 2)));
1545 } else {
1546 ND_PRINT((ndo, " AS #%s, origin %s",
1547 as_printf(ndo, astostr, sizeof(astostr),
1548 EXTRACT_BE_U_4(tptr)), ipaddr_string(ndo, tptr + 4)));
1549 }
1550 break;
1551 case BGPTYPE_AGGREGATOR4:
1552 if (len != 8) {
1553 ND_PRINT((ndo, "invalid len"));
1554 break;
1555 }
1556 ND_TCHECK_8(tptr);
1557 ND_PRINT((ndo, " AS #%s, origin %s",
1558 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr)),
1559 ipaddr_string(ndo, tptr + 4)));
1560 break;
1561 case BGPTYPE_COMMUNITIES:
1562 if (len % 4) {
1563 ND_PRINT((ndo, "invalid len"));
1564 break;
1565 }
1566 while (tlen>0) {
1567 uint32_t comm;
1568 ND_TCHECK_4(tptr);
1569 comm = EXTRACT_BE_U_4(tptr);
1570 switch (comm) {
1571 case BGP_COMMUNITY_NO_EXPORT:
1572 ND_PRINT((ndo, " NO_EXPORT"));
1573 break;
1574 case BGP_COMMUNITY_NO_ADVERT:
1575 ND_PRINT((ndo, " NO_ADVERTISE"));
1576 break;
1577 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1578 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1579 break;
1580 default:
1581 ND_PRINT((ndo, "%u:%u%s",
1582 (comm >> 16) & 0xffff,
1583 comm & 0xffff,
1584 (tlen>4) ? ", " : ""));
1585 break;
1586 }
1587 tlen -=4;
1588 tptr +=4;
1589 }
1590 break;
1591 case BGPTYPE_ORIGINATOR_ID:
1592 if (len != 4) {
1593 ND_PRINT((ndo, "invalid len"));
1594 break;
1595 }
1596 ND_TCHECK_4(tptr);
1597 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1598 break;
1599 case BGPTYPE_CLUSTER_LIST:
1600 if (len % 4) {
1601 ND_PRINT((ndo, "invalid len"));
1602 break;
1603 }
1604 while (tlen>0) {
1605 ND_TCHECK_4(tptr);
1606 ND_PRINT((ndo, "%s%s",
1607 ipaddr_string(ndo, tptr),
1608 (tlen>4) ? ", " : ""));
1609 tlen -=4;
1610 tptr +=4;
1611 }
1612 break;
1613 case BGPTYPE_MP_REACH_NLRI:
1614 ND_TCHECK_3(tptr);
1615 af = EXTRACT_BE_U_2(tptr);
1616 safi = EXTRACT_U_1(tptr + 2);
1617
1618 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1619 tok2str(af_values, "Unknown AFI", af),
1620 af,
1621 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1622 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1623 safi));
1624
1625 switch(af<<8 | safi) {
1626 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1627 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1628 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1629 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1630 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1631 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1632 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1633 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1634 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1635 case (AFNUM_INET<<8 | SAFNUM_MDT):
1636 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1637 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1638 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1639 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1640 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1641 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1642 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1643 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1644 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1645 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1646 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1647 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1648 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1649 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1650 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1651 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1652 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1653 break;
1654 default:
1655 ND_TCHECK_LEN(tptr, tlen);
1656 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1657 if (ndo->ndo_vflag <= 1)
1658 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1659 goto done;
1660 break;
1661 }
1662
1663 tptr +=3;
1664
1665 ND_TCHECK_1(tptr);
1666 nhlen = EXTRACT_U_1(tptr);
1667 tlen = nhlen;
1668 tptr++;
1669
1670 if (tlen) {
1671 int nnh = 0;
1672 ND_PRINT((ndo, "\n\t nexthop: "));
1673 while (tlen > 0) {
1674 if ( nnh++ > 0 ) {
1675 ND_PRINT((ndo, ", " ));
1676 }
1677 switch(af<<8 | safi) {
1678 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1679 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1680 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1681 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1682 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1683 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1684 case (AFNUM_INET<<8 | SAFNUM_MDT):
1685 if (tlen < sizeof(struct in_addr)) {
1686 ND_PRINT((ndo, "invalid len"));
1687 tlen = 0;
1688 } else {
1689 ND_TCHECK_LEN(tptr, sizeof(struct in_addr));
1690 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1691 tlen -= sizeof(struct in_addr);
1692 tptr += sizeof(struct in_addr);
1693 }
1694 break;
1695 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1696 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1697 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1698 if (tlen < sizeof(struct in_addr)+BGP_VPN_RD_LEN) {
1699 ND_PRINT((ndo, "invalid len"));
1700 tlen = 0;
1701 } else {
1702 ND_TCHECK_LEN(tptr,
1703 sizeof(struct in_addr) + BGP_VPN_RD_LEN);
1704 ND_PRINT((ndo, "RD: %s, %s",
1705 bgp_vpn_rd_print(ndo, tptr),
1706 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1707 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1708 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1709 }
1710 break;
1711 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1712 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1713 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1714 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1715 if (tlen < sizeof(struct in6_addr)) {
1716 ND_PRINT((ndo, "invalid len"));
1717 tlen = 0;
1718 } else {
1719 ND_TCHECK_LEN(tptr, sizeof(struct in6_addr));
1720 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr)));
1721 tlen -= sizeof(struct in6_addr);
1722 tptr += sizeof(struct in6_addr);
1723 }
1724 break;
1725 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1726 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1727 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1728 if (tlen < sizeof(struct in6_addr)+BGP_VPN_RD_LEN) {
1729 ND_PRINT((ndo, "invalid len"));
1730 tlen = 0;
1731 } else {
1732 ND_TCHECK_LEN(tptr,
1733 sizeof(struct in6_addr) + BGP_VPN_RD_LEN);
1734 ND_PRINT((ndo, "RD: %s, %s",
1735 bgp_vpn_rd_print(ndo, tptr),
1736 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1737 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1738 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1739 }
1740 break;
1741 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1742 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1743 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1744 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1745 if (tlen < sizeof(struct in_addr)) {
1746 ND_PRINT((ndo, "invalid len"));
1747 tlen = 0;
1748 } else {
1749 ND_TCHECK_LEN(tptr, sizeof(struct in_addr));
1750 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1751 tlen -= (sizeof(struct in_addr));
1752 tptr += (sizeof(struct in_addr));
1753 }
1754 break;
1755 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1756 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1757 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1758 ND_TCHECK_LEN(tptr, tlen);
1759 ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen)));
1760 tptr += tlen;
1761 tlen = 0;
1762 break;
1763
1764 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1765 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1766 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1767 if (tlen < BGP_VPN_RD_LEN+1) {
1768 ND_PRINT((ndo, "invalid len"));
1769 tlen = 0;
1770 } else {
1771 ND_TCHECK_LEN(tptr, tlen);
1772 ND_PRINT((ndo, "RD: %s, %s",
1773 bgp_vpn_rd_print(ndo, tptr),
1774 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1775 /* rfc986 mapped IPv4 address ? */
1776 if (EXTRACT_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
1777 ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4)));
1778 /* rfc1888 mapped IPv6 address ? */
1779 else if (EXTRACT_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
1780 ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3)));
1781 tptr += tlen;
1782 tlen = 0;
1783 }
1784 break;
1785 default:
1786 ND_TCHECK_LEN(tptr, tlen);
1787 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1788 if (ndo->ndo_vflag <= 1)
1789 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1790 tptr += tlen;
1791 tlen = 0;
1792 goto done;
1793 break;
1794 }
1795 }
1796 }
1797 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1798 tptr += tlen;
1799
1800 ND_TCHECK_1(tptr);
1801 snpa = EXTRACT_U_1(tptr);
1802 tptr++;
1803
1804 if (snpa) {
1805 ND_PRINT((ndo, "\n\t %u SNPA", snpa));
1806 for (/*nothing*/; snpa > 0; snpa--) {
1807 ND_TCHECK_1(tptr);
1808 ND_PRINT((ndo, "\n\t %d bytes", EXTRACT_U_1(tptr)));
1809 tptr += EXTRACT_U_1(tptr) + 1;
1810 }
1811 } else {
1812 ND_PRINT((ndo, ", no SNPA"));
1813 }
1814
1815 add_path4 = check_add_path(tptr, (len-(tptr - pptr)), 32);
1816 add_path6 = check_add_path(tptr, (len-(tptr - pptr)), 128);
1817
1818 while (tptr < pptr + len) {
1819 switch (af<<8 | safi) {
1820 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1821 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1822 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1823 if (add_path4) {
1824 path_id = EXTRACT_32BITS(tptr);
1825 tptr += 4;
1826 }
1827 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1828 if (advance == -1)
1829 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1830 else if (advance == -2)
1831 goto trunc;
1832 else if (advance == -3)
1833 break; /* bytes left, but not enough */
1834 else
1835 ND_PRINT((ndo, "\n\t %s", buf));
1836 if (add_path4) {
1837 ND_PRINT((ndo, " Path Id: %d", path_id));
1838 }
1839 break;
1840 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1841 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1842 if (advance == -1)
1843 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1844 else if (advance == -2)
1845 goto trunc;
1846 else if (advance == -3)
1847 break; /* bytes left, but not enough */
1848 else
1849 ND_PRINT((ndo, "\n\t %s", buf));
1850 break;
1851 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1852 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1853 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1854 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1855 if (advance == -1)
1856 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1857 else if (advance == -2)
1858 goto trunc;
1859 else
1860 ND_PRINT((ndo, "\n\t %s", buf));
1861 break;
1862 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1863 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf));
1864 if (advance == -1)
1865 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1866 else if (advance == -2)
1867 goto trunc;
1868 else
1869 ND_PRINT((ndo, "\n\t %s", buf));
1870 break;
1871 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1872 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1873 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1874 if (advance == -1)
1875 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1876 else if (advance == -2)
1877 goto trunc;
1878 else
1879 ND_PRINT((ndo, "\n\t %s", buf));
1880 break;
1881
1882 case (AFNUM_INET<<8 | SAFNUM_MDT):
1883 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1884 if (advance == -1)
1885 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1886 else if (advance == -2)
1887 goto trunc;
1888 else
1889 ND_PRINT((ndo, "\n\t %s", buf));
1890 break;
1891 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1892 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1893 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1894 if (add_path6) {
1895 path_id = EXTRACT_32BITS(tptr);
1896 tptr += 4;
1897 }
1898 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1899 if (advance == -1)
1900 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1901 else if (advance == -2)
1902 goto trunc;
1903 else if (advance == -3)
1904 break; /* bytes left, but not enough */
1905 else
1906 ND_PRINT((ndo, "\n\t %s", buf));
1907 if (add_path6) {
1908 ND_PRINT((ndo, " Path Id: %d", path_id));
1909 }
1910 break;
1911 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1912 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1913 if (advance == -1)
1914 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1915 else if (advance == -2)
1916 goto trunc;
1917 else if (advance == -3)
1918 break; /* bytes left, but not enough */
1919 else
1920 ND_PRINT((ndo, "\n\t %s", buf));
1921 break;
1922 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1923 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1924 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1925 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1926 if (advance == -1)
1927 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1928 else if (advance == -2)
1929 goto trunc;
1930 else
1931 ND_PRINT((ndo, "\n\t %s", buf));
1932 break;
1933 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1934 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1935 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1936 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1937 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1938 if (advance == -1)
1939 ND_PRINT((ndo, "\n\t (illegal length)"));
1940 else if (advance == -2)
1941 goto trunc;
1942 else
1943 ND_PRINT((ndo, "\n\t %s", buf));
1944 break;
1945 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1946 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1947 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1948 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1949 if (advance == -1)
1950 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1951 else if (advance == -2)
1952 goto trunc;
1953 else
1954 ND_PRINT((ndo, "\n\t %s", buf));
1955 break;
1956 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1957 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1958 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1959 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1960 if (advance == -1)
1961 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1962 else if (advance == -2)
1963 goto trunc;
1964 else
1965 ND_PRINT((ndo, "\n\t %s", buf));
1966 break;
1967 default:
1968 ND_TCHECK_LEN(tptr, tlen);
1969 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1970 if (ndo->ndo_vflag <= 1)
1971 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1972 advance = 0;
1973 tptr = pptr + len;
1974 break;
1975 }
1976 if (advance < 0)
1977 break;
1978 tptr += advance;
1979 }
1980 done:
1981 break;
1982
1983 case BGPTYPE_MP_UNREACH_NLRI:
1984 ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
1985 af = EXTRACT_BE_U_2(tptr);
1986 safi = EXTRACT_U_1(tptr + 2);
1987
1988 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1989 tok2str(af_values, "Unknown AFI", af),
1990 af,
1991 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1992 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1993 safi));
1994
1995 if (len == BGP_MP_NLRI_MINSIZE)
1996 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
1997
1998 tptr += 3;
1999
2000 add_path4 = check_add_path(tptr, (len-(tptr - pptr)), 32);
2001 add_path6 = check_add_path(tptr, (len-(tptr - pptr)), 128);
2002
2003 while (tptr < pptr + len) {
2004 switch (af<<8 | safi) {
2005 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
2006 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
2007 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
2008 if (add_path4) {
2009 path_id = EXTRACT_32BITS(tptr);
2010 tptr += 4;
2011 }
2012 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
2013 if (advance == -1)
2014 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2015 else if (advance == -2)
2016 goto trunc;
2017 else if (advance == -3)
2018 break; /* bytes left, but not enough */
2019 else
2020 ND_PRINT((ndo, "\n\t %s", buf));
2021 if (add_path4) {
2022 ND_PRINT((ndo, " Path Id: %d", path_id));
2023 }
2024 break;
2025 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
2026 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
2027 if (advance == -1)
2028 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2029 else if (advance == -2)
2030 goto trunc;
2031 else if (advance == -3)
2032 break; /* bytes left, but not enough */
2033 else
2034 ND_PRINT((ndo, "\n\t %s", buf));
2035 break;
2036 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
2037 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
2038 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
2039 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
2040 if (advance == -1)
2041 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2042 else if (advance == -2)
2043 goto trunc;
2044 else
2045 ND_PRINT((ndo, "\n\t %s", buf));
2046 break;
2047 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
2048 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
2049 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
2050 if (add_path6) {
2051 path_id = EXTRACT_32BITS(tptr);
2052 tptr += 4;
2053 }
2054 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
2055 if (advance == -1)
2056 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2057 else if (advance == -2)
2058 goto trunc;
2059 else if (advance == -3)
2060 break; /* bytes left, but not enough */
2061 else
2062 ND_PRINT((ndo, "\n\t %s", buf));
2063 if (add_path6) {
2064 ND_PRINT((ndo, " Path Id: %d", path_id));
2065 }
2066 break;
2067 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
2068 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
2069 if (advance == -1)
2070 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2071 else if (advance == -2)
2072 goto trunc;
2073 else if (advance == -3)
2074 break; /* bytes left, but not enough */
2075 else
2076 ND_PRINT((ndo, "\n\t %s", buf));
2077 break;
2078 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
2079 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
2080 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
2081 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
2082 if (advance == -1)
2083 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2084 else if (advance == -2)
2085 goto trunc;
2086 else
2087 ND_PRINT((ndo, "\n\t %s", buf));
2088 break;
2089 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
2090 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2091 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2092 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2093 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
2094 if (advance == -1)
2095 ND_PRINT((ndo, "\n\t (illegal length)"));
2096 else if (advance == -2)
2097 goto trunc;
2098 else
2099 ND_PRINT((ndo, "\n\t %s", buf));
2100 break;
2101 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2102 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2103 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2104 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2105 if (advance == -1)
2106 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2107 else if (advance == -2)
2108 goto trunc;
2109 else
2110 ND_PRINT((ndo, "\n\t %s", buf));
2111 break;
2112 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2113 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2114 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2115 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2116 if (advance == -1)
2117 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2118 else if (advance == -2)
2119 goto trunc;
2120 else
2121 ND_PRINT((ndo, "\n\t %s", buf));
2122 break;
2123 case (AFNUM_INET<<8 | SAFNUM_MDT):
2124 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
2125 if (advance == -1)
2126 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2127 else if (advance == -2)
2128 goto trunc;
2129 else
2130 ND_PRINT((ndo, "\n\t %s", buf));
2131 break;
2132 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
2133 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
2134 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
2135 if (advance == -1)
2136 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2137 else if (advance == -2)
2138 goto trunc;
2139 else
2140 ND_PRINT((ndo, "\n\t %s", buf));
2141 break;
2142 default:
2143 ND_TCHECK_LEN(tptr - 3, tlen);
2144 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
2145 if (ndo->ndo_vflag <= 1)
2146 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
2147 advance = 0;
2148 tptr = pptr + len;
2149 break;
2150 }
2151 if (advance < 0)
2152 break;
2153 tptr += advance;
2154 }
2155 break;
2156 case BGPTYPE_EXTD_COMMUNITIES:
2157 if (len % 8) {
2158 ND_PRINT((ndo, "invalid len"));
2159 break;
2160 }
2161 while (tlen>0) {
2162 uint16_t extd_comm;
2163
2164 ND_TCHECK_2(tptr);
2165 extd_comm=EXTRACT_BE_U_2(tptr);
2166
2167 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]",
2168 tok2str(bgp_extd_comm_subtype_values,
2169 "unknown extd community typecode",
2170 extd_comm),
2171 extd_comm,
2172 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2173
2174 ND_TCHECK_6(tptr + 2);
2175 switch(extd_comm) {
2176 case BGP_EXT_COM_RT_0:
2177 case BGP_EXT_COM_RO_0:
2178 case BGP_EXT_COM_L2VPN_RT_0:
2179 ND_PRINT((ndo, ": %u:%u (= %s)",
2180 EXTRACT_BE_U_2(tptr + 2),
2181 EXTRACT_BE_U_4(tptr + 4),
2182 ipaddr_string(ndo, tptr+4)));
2183 break;
2184 case BGP_EXT_COM_RT_1:
2185 case BGP_EXT_COM_RO_1:
2186 case BGP_EXT_COM_L2VPN_RT_1:
2187 case BGP_EXT_COM_VRF_RT_IMP:
2188 ND_PRINT((ndo, ": %s:%u",
2189 ipaddr_string(ndo, tptr+2),
2190 EXTRACT_BE_U_2(tptr + 6)));
2191 break;
2192 case BGP_EXT_COM_RT_2:
2193 case BGP_EXT_COM_RO_2:
2194 ND_PRINT((ndo, ": %s:%u",
2195 as_printf(ndo, astostr, sizeof(astostr),
2196 EXTRACT_BE_U_4(tptr + 2)), EXTRACT_BE_U_2(tptr + 6)));
2197 break;
2198 case BGP_EXT_COM_LINKBAND:
2199 bw.i = EXTRACT_BE_U_4(tptr + 2);
2200 ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2201 bw.f*8/1000000));
2202 break;
2203 case BGP_EXT_COM_VPN_ORIGIN:
2204 case BGP_EXT_COM_VPN_ORIGIN2:
2205 case BGP_EXT_COM_VPN_ORIGIN3:
2206 case BGP_EXT_COM_VPN_ORIGIN4:
2207 case BGP_EXT_COM_OSPF_RID:
2208 case BGP_EXT_COM_OSPF_RID2:
2209 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2)));
2210 break;
2211 case BGP_EXT_COM_OSPF_RTYPE:
2212 case BGP_EXT_COM_OSPF_RTYPE2:
2213 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2214 ipaddr_string(ndo, tptr+2),
2215 tok2str(bgp_extd_comm_ospf_rtype_values,
2216 "unknown (0x%02x)",
2217 EXTRACT_U_1((tptr + 6))),
2218 (EXTRACT_U_1(tptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2219 ((EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_EXT) || (EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2220 break;
2221 case BGP_EXT_COM_L2INFO:
2222 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2223 tok2str(l2vpn_encaps_values,
2224 "unknown encaps",
2225 EXTRACT_U_1((tptr + 2))),
2226 EXTRACT_U_1((tptr + 3)),
2227 EXTRACT_BE_U_2(tptr + 4)));
2228 break;
2229 case BGP_EXT_COM_SOURCE_AS:
2230 ND_PRINT((ndo, ": AS %u", EXTRACT_BE_U_2(tptr + 2)));
2231 break;
2232 default:
2233 ND_TCHECK_8(tptr);
2234 print_unknown_data(ndo, tptr, "\n\t ", 8);
2235 break;
2236 }
2237 tlen -=8;
2238 tptr +=8;
2239 }
2240 break;
2241
2242 case BGPTYPE_PMSI_TUNNEL:
2243 {
2244 uint8_t tunnel_type, flags;
2245
2246 ND_TCHECK_5(tptr);
2247 flags = EXTRACT_U_1(tptr);
2248 tunnel_type = EXTRACT_U_1(tptr + 1);
2249 tlen = len;
2250
2251 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2252 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2253 tunnel_type,
2254 bittok2str(bgp_pmsi_flag_values, "none", flags),
2255 EXTRACT_BE_U_3(tptr + 2)>>4));
2256
2257 tptr +=5;
2258 tlen -= 5;
2259
2260 switch (tunnel_type) {
2261 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2262 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2263 ND_TCHECK_8(tptr);
2264 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s",
2265 ipaddr_string(ndo, tptr),
2266 ipaddr_string(ndo, tptr+4)));
2267 break;
2268
2269 case BGP_PMSI_TUNNEL_PIM_SSM:
2270 ND_TCHECK_8(tptr);
2271 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s",
2272 ipaddr_string(ndo, tptr),
2273 ipaddr_string(ndo, tptr+4)));
2274 break;
2275 case BGP_PMSI_TUNNEL_INGRESS:
2276 ND_TCHECK_4(tptr);
2277 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s",
2278 ipaddr_string(ndo, tptr)));
2279 break;
2280 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2281 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2282 ND_TCHECK_8(tptr);
2283 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x",
2284 ipaddr_string(ndo, tptr),
2285 EXTRACT_BE_U_4(tptr + 4)));
2286 break;
2287 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2288 ND_TCHECK_8(tptr);
2289 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2290 ipaddr_string(ndo, tptr),
2291 EXTRACT_BE_U_4(tptr + 4)));
2292 break;
2293 default:
2294 if (ndo->ndo_vflag <= 1) {
2295 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2296 }
2297 }
2298 break;
2299 }
2300 case BGPTYPE_AIGP:
2301 {
2302 uint8_t type;
2303 uint16_t length;
2304
2305 tlen = len;
2306
2307 while (tlen >= 3) {
2308
2309 ND_TCHECK_3(tptr);
2310
2311 type = EXTRACT_U_1(tptr);
2312 length = EXTRACT_BE_U_2(tptr + 1);
2313 tptr += 3;
2314 tlen -= 3;
2315
2316 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u",
2317 tok2str(bgp_aigp_values, "Unknown", type),
2318 type, length));
2319
2320 if (length < 3)
2321 goto trunc;
2322 length -= 3;
2323
2324 /*
2325 * Check if we can read the TLV data.
2326 */
2327 ND_TCHECK_LEN(tptr + 3, length);
2328
2329 switch (type) {
2330
2331 case BGP_AIGP_TLV:
2332 if (length < 8)
2333 goto trunc;
2334 ND_PRINT((ndo, ", metric %" PRIu64,
2335 EXTRACT_BE_U_8(tptr)));
2336 break;
2337
2338 default:
2339 if (ndo->ndo_vflag <= 1) {
2340 print_unknown_data(ndo, tptr,"\n\t ", length);
2341 }
2342 }
2343
2344 tptr += length;
2345 tlen -= length;
2346 }
2347 break;
2348 }
2349 case BGPTYPE_ATTR_SET:
2350 ND_TCHECK_4(tptr);
2351 if (len < 4)
2352 goto trunc;
2353 ND_PRINT((ndo, "\n\t Origin AS: %s",
2354 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr))));
2355 tptr+=4;
2356 len -=4;
2357
2358 while (len) {
2359 u_int aflags, alenlen, alen;
2360
2361 ND_TCHECK_2(tptr);
2362 if (len < 2)
2363 goto trunc;
2364 aflags = EXTRACT_U_1(tptr);
2365 atype = EXTRACT_U_1(tptr + 1);
2366 tptr += 2;
2367 len -= 2;
2368 alenlen = bgp_attr_lenlen(aflags, tptr);
2369 ND_TCHECK_LEN(tptr, alenlen);
2370 if (len < alenlen)
2371 goto trunc;
2372 alen = bgp_attr_len(aflags, tptr);
2373 tptr += alenlen;
2374 len -= alenlen;
2375
2376 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2377 tok2str(bgp_attr_values,
2378 "Unknown Attribute", atype),
2379 atype,
2380 alen));
2381
2382 if (aflags) {
2383 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2384 aflags & 0x80 ? "O" : "",
2385 aflags & 0x40 ? "T" : "",
2386 aflags & 0x20 ? "P" : "",
2387 aflags & 0x10 ? "E" : ""));
2388 if (aflags & 0xf)
2389 ND_PRINT((ndo, "+%x", aflags & 0xf));
2390 ND_PRINT((ndo, "]: "));
2391 }
2392 /* FIXME check for recursion */
2393 if (!bgp_attr_print(ndo, atype, tptr, alen))
2394 return 0;
2395 tptr += alen;
2396 len -= alen;
2397 }
2398 break;
2399
2400 case BGPTYPE_LARGE_COMMUNITY:
2401 if (len == 0 || len % 12) {
2402 ND_PRINT((ndo, "invalid len"));
2403 break;
2404 }
2405 ND_PRINT((ndo, "\n\t "));
2406 while (len > 0) {
2407 ND_TCHECK_LEN(tptr, 12);
2408 ND_PRINT((ndo, "%u:%u:%u%s",
2409 EXTRACT_BE_U_4(tptr),
2410 EXTRACT_BE_U_4(tptr + 4),
2411 EXTRACT_BE_U_4(tptr + 8),
2412 (len > 12) ? ", " : ""));
2413 tptr += 12;
2414 len -= 12;
2415 }
2416 break;
2417 default:
2418 ND_TCHECK_LEN(pptr, len);
2419 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2420 if (ndo->ndo_vflag <= 1)
2421 print_unknown_data(ndo, pptr, "\n\t ", len);
2422 break;
2423 }
2424 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2425 ND_TCHECK_LEN(pptr, len);
2426 print_unknown_data(ndo, pptr, "\n\t ", len);
2427 }
2428 return 1;
2429
2430 trunc:
2431 return 0;
2432 }
2433
2434 static void
2435 bgp_capabilities_print(netdissect_options *ndo,
2436 const u_char *opt, u_int caps_len)
2437 {
2438 u_int cap_type, cap_len, tcap_len, cap_offset;
2439 u_int i = 0;
2440
2441 while (i < caps_len) {
2442 ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
2443 cap_type=EXTRACT_U_1(opt + i);
2444 cap_len=EXTRACT_U_1(opt + i + 1);
2445 tcap_len=cap_len;
2446 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2447 tok2str(bgp_capcode_values, "Unknown",
2448 cap_type),
2449 cap_type,
2450 cap_len));
2451 ND_TCHECK_LEN(opt + 2 + i, cap_len);
2452 switch (cap_type) {
2453 case BGP_CAPCODE_MP:
2454 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2455 tok2str(af_values, "Unknown",
2456 EXTRACT_BE_U_2(opt + i + 2)),
2457 EXTRACT_BE_U_2(opt + i + 2),
2458 tok2str(bgp_safi_values, "Unknown",
2459 EXTRACT_U_1(opt + i + 5)),
2460 EXTRACT_U_1(opt + i + 5)));
2461 break;
2462 case BGP_CAPCODE_RESTART:
2463 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2464 ((EXTRACT_U_1(opt + i + 2))&0x80) ? "R" : "none",
2465 EXTRACT_BE_U_2(opt + i + 2)&0xfff));
2466 tcap_len-=2;
2467 cap_offset=4;
2468 while(tcap_len>=4) {
2469 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2470 tok2str(af_values,"Unknown",
2471 EXTRACT_BE_U_2(opt + i + cap_offset)),
2472 EXTRACT_BE_U_2(opt + i + cap_offset),
2473 tok2str(bgp_safi_values,"Unknown",
2474 EXTRACT_U_1(opt + i + cap_offset + 2)),
2475 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2476 ((EXTRACT_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" ));
2477 tcap_len-=4;
2478 cap_offset+=4;
2479 }
2480 break;
2481 case BGP_CAPCODE_RR:
2482 case BGP_CAPCODE_RR_CISCO:
2483 break;
2484 case BGP_CAPCODE_AS_NEW:
2485
2486 /*
2487 * Extract the 4 byte AS number encoded.
2488 */
2489 if (cap_len == 4) {
2490 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2491 as_printf(ndo, astostr, sizeof(astostr),
2492 EXTRACT_BE_U_4(opt + i + 2))));
2493 }
2494 break;
2495 case BGP_CAPCODE_ADD_PATH:
2496 cap_offset=2;
2497 if (tcap_len == 0) {
2498 ND_PRINT((ndo, " (bogus)")); /* length */
2499 break;
2500 }
2501 while (tcap_len > 0) {
2502 if (tcap_len < 4) {
2503 ND_PRINT((ndo, "\n\t\t(invalid)"));
2504 break;
2505 }
2506 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2507 tok2str(af_values,"Unknown",EXTRACT_BE_U_2(opt + i + cap_offset)),
2508 EXTRACT_BE_U_2(opt + i + cap_offset),
2509 tok2str(bgp_safi_values,"Unknown",EXTRACT_U_1(opt + i + cap_offset + 2)),
2510 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2511 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",EXTRACT_U_1(opt + i + cap_offset + 3))
2512 ));
2513 tcap_len-=4;
2514 cap_offset+=4;
2515 }
2516 break;
2517 default:
2518 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2519 cap_type));
2520 if (ndo->ndo_vflag <= 1)
2521 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2522 cap_len);
2523 break;
2524 }
2525 if (ndo->ndo_vflag > 1 && cap_len > 0) {
2526 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2527 }
2528 i += BGP_CAP_HEADER_SIZE + cap_len;
2529 }
2530 return;
2531
2532 trunc:
2533 ND_PRINT((ndo, "[|BGP]"));
2534 }
2535
2536 static void
2537 bgp_open_print(netdissect_options *ndo,
2538 const u_char *dat, u_int length)
2539 {
2540 const struct bgp_open *bgp_open_header;
2541 u_int optslen;
2542 const struct bgp_opt *bgpopt;
2543 const u_char *opt;
2544 u_int i;
2545
2546 ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
2547 if (length < BGP_OPEN_SIZE)
2548 goto trunc;
2549
2550 bgp_open_header = (const struct bgp_open *)dat;
2551
2552 ND_PRINT((ndo, "\n\t Version %u, ",
2553 EXTRACT_U_1(bgp_open_header->bgpo_version)));
2554 ND_PRINT((ndo, "my AS %s, ",
2555 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(bgp_open_header->bgpo_myas))));
2556 ND_PRINT((ndo, "Holdtime %us, ",
2557 EXTRACT_BE_U_2(bgp_open_header->bgpo_holdtime)));
2558 ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgp_open_header->bgpo_id)));
2559 optslen = EXTRACT_U_1(bgp_open_header->bgpo_optlen);
2560 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", optslen));
2561
2562 opt = dat + BGP_OPEN_SIZE;
2563 length -= BGP_OPEN_SIZE;
2564
2565 i = 0;
2566 while (i < optslen) {
2567 uint8_t opt_type, opt_len;
2568
2569 ND_TCHECK_LEN(opt + i, BGP_OPT_SIZE);
2570 if (length < BGP_OPT_SIZE + i)
2571 goto trunc;
2572 bgpopt = (const struct bgp_opt *)(opt + i);
2573 opt_type = EXTRACT_U_1(bgpopt->bgpopt_type);
2574 opt_len = EXTRACT_U_1(bgpopt->bgpopt_len);
2575 if (BGP_OPT_SIZE + i + opt_len > optslen) {
2576 ND_PRINT((ndo, "\n\t Option %u, length: %u, goes past the end of the options",
2577 opt_type, opt_len));
2578 break;
2579 }
2580
2581 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u",
2582 tok2str(bgp_opt_values,"Unknown",opt_type),
2583 opt_type,
2584 opt_len));
2585
2586 /* now let's decode the options we know*/
2587 switch(opt_type) {
2588
2589 case BGP_OPT_CAP:
2590 bgp_capabilities_print(ndo, opt + BGP_OPT_SIZE + i,
2591 opt_len);
2592 break;
2593
2594 case BGP_OPT_AUTH:
2595 default:
2596 ND_PRINT((ndo, "\n\t no decoder for option %u",
2597 opt_type));
2598 break;
2599 }
2600 i += BGP_OPT_SIZE + opt_len;
2601 }
2602 return;
2603 trunc:
2604 ND_PRINT((ndo, "[|BGP]"));
2605 }
2606
2607 static void
2608 bgp_update_print(netdissect_options *ndo,
2609 const u_char *dat, int length)
2610 {
2611 const struct bgp *bgp_header;
2612 const u_char *p;
2613 int withdrawn_routes_len;
2614 char buf[MAXHOSTNAMELEN + 100];
2615 int wpfx;
2616 int len;
2617 int i;
2618 int add_path;
2619 int path_id;
2620
2621 ND_TCHECK_LEN(dat, BGP_SIZE);
2622 if (length < BGP_SIZE)
2623 goto trunc;
2624 bgp_header = (const struct bgp *)dat;
2625 p = dat + BGP_SIZE;
2626 length -= BGP_SIZE;
2627
2628 /* Unfeasible routes */
2629 ND_TCHECK_2(p);
2630 if (length < 2)
2631 goto trunc;
2632 withdrawn_routes_len = EXTRACT_BE_U_2(p);
2633 p += 2;
2634 length -= 2;
2635 if (withdrawn_routes_len > 1) {
2636 /*
2637 * Without keeping state from the original NLRI message,
2638 * it's not possible to tell if this a v4 or v6 route,
2639 * so only try to decode it if we're not v6 enabled.
2640 */
2641 ND_TCHECK_LEN(p, withdrawn_routes_len);
2642 if (length < withdrawn_routes_len)
2643 goto trunc;
2644
2645 ND_PRINT((ndo, "\n\t Withdrawn routes:"));
2646 add_path = check_add_path(p, withdrawn_routes_len, 32);
2647 while(withdrawn_routes_len > 0) {
2648 if (add_path) {
2649 path_id = EXTRACT_32BITS(p);
2650 p += 4;
2651 length -= 4;
2652 withdrawn_routes_len -= 4;
2653 }
2654 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
2655 if (wpfx == -1) {
2656 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2657 break;
2658 } else if (wpfx == -2)
2659 goto trunc;
2660 else if (wpfx == -3)
2661 goto trunc; /* bytes left, but not enough */
2662 else {
2663 ND_PRINT((ndo, "\n\t %s", buf));
2664 if (add_path) {
2665 ND_PRINT((ndo, " Path Id: %d", path_id));
2666 }
2667 p += wpfx;
2668 length -= wpfx;
2669 withdrawn_routes_len -= wpfx;
2670 }
2671 }
2672 } else {
2673 p += withdrawn_routes_len;
2674 length -= withdrawn_routes_len;
2675 }
2676
2677 ND_TCHECK_2(p);
2678 if (length < 2)
2679 goto trunc;
2680 len = EXTRACT_BE_U_2(p);
2681 p += 2;
2682 length -= 2;
2683
2684 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2685 /* No withdrawn routes, no path attributes, no NLRI */
2686 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2687 return;
2688 }
2689
2690 if (len) {
2691 /* do something more useful!*/
2692 while (len) {
2693 int aflags, atype, alenlen, alen;
2694
2695 ND_TCHECK_2(p);
2696 if (len < 2)
2697 goto trunc;
2698 if (length < 2)
2699 goto trunc;
2700 aflags = EXTRACT_U_1(p);
2701 atype = EXTRACT_U_1(p + 1);
2702 p += 2;
2703 len -= 2;
2704 length -= 2;
2705 alenlen = bgp_attr_lenlen(aflags, p);
2706 ND_TCHECK_LEN(p, alenlen);
2707 if (len < alenlen)
2708 goto trunc;
2709 if (length < alenlen)
2710 goto trunc;
2711 alen = bgp_attr_len(aflags, p);
2712 p += alenlen;
2713 len -= alenlen;
2714 length -= alenlen;
2715
2716 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2717 tok2str(bgp_attr_values, "Unknown Attribute",
2718 atype),
2719 atype,
2720 alen));
2721
2722 if (aflags) {
2723 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2724 aflags & 0x80 ? "O" : "",
2725 aflags & 0x40 ? "T" : "",
2726 aflags & 0x20 ? "P" : "",
2727 aflags & 0x10 ? "E" : ""));
2728 if (aflags & 0xf)
2729 ND_PRINT((ndo, "+%x", aflags & 0xf));
2730 ND_PRINT((ndo, "]: "));
2731 }
2732 if (len < alen)
2733 goto trunc;
2734 if (length < alen)
2735 goto trunc;
2736 if (!bgp_attr_print(ndo, atype, p, alen))
2737 goto trunc;
2738 p += alen;
2739 len -= alen;
2740 length -= alen;
2741 }
2742 }
2743
2744 if (length) {
2745 add_path = check_add_path(p, length, 32);
2746 ND_PRINT((ndo, "\n\t Updated routes:"));
2747 while (length > 0) {
2748 if (add_path) {
2749 path_id = EXTRACT_32BITS(p);
2750 p += 4;
2751 length -= 4;
2752 }
2753 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2754 if (i == -1) {
2755 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2756 break;
2757 } else if (i == -2)
2758 goto trunc;
2759 else if (i == -3)
2760 goto trunc; /* bytes left, but not enough */
2761 else {
2762 ND_PRINT((ndo, "\n\t %s", buf));
2763 if (add_path) {
2764 ND_PRINT((ndo, " Path Id: %d", path_id));
2765 }
2766 p += i;
2767 length -= i;
2768 }
2769 }
2770 }
2771 return;
2772 trunc:
2773 ND_PRINT((ndo, "[|BGP]"));
2774 }
2775
2776 static void
2777 bgp_notification_print(netdissect_options *ndo,
2778 const u_char *dat, int length)
2779 {
2780 const struct bgp_notification *bgp_notification_header;
2781 const u_char *tptr;
2782 uint8_t bgpn_major, bgpn_minor;
2783 uint8_t shutdown_comm_length;
2784 uint8_t remainder_offset;
2785
2786 ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
2787 if (length<BGP_NOTIFICATION_SIZE)
2788 return;
2789
2790 bgp_notification_header = (const struct bgp_notification *)dat;
2791 bgpn_major = EXTRACT_U_1(bgp_notification_header->bgpn_major);
2792 bgpn_minor = EXTRACT_U_1(bgp_notification_header->bgpn_minor);
2793
2794 ND_PRINT((ndo, ", %s (%u)",
2795 tok2str(bgp_notify_major_values, "Unknown Error",
2796 bgpn_major),
2797 bgpn_major));
2798
2799 switch (bgpn_major) {
2800
2801 case BGP_NOTIFY_MAJOR_MSG:
2802 ND_PRINT((ndo, ", subcode %s (%u)",
2803 tok2str(bgp_notify_minor_msg_values, "Unknown",
2804 bgpn_minor),
2805 bgpn_minor));
2806 break;
2807 case BGP_NOTIFY_MAJOR_OPEN:
2808 ND_PRINT((ndo, ", subcode %s (%u)",
2809 tok2str(bgp_notify_minor_open_values, "Unknown",
2810 bgpn_minor),
2811 bgpn_minor));
2812 break;
2813 case BGP_NOTIFY_MAJOR_UPDATE:
2814 ND_PRINT((ndo, ", subcode %s (%u)",
2815 tok2str(bgp_notify_minor_update_values, "Unknown",
2816 bgpn_minor),
2817 bgpn_minor));
2818 break;
2819 case BGP_NOTIFY_MAJOR_FSM:
2820 ND_PRINT((ndo, " subcode %s (%u)",
2821 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2822 bgpn_minor),
2823 bgpn_minor));
2824 break;
2825 case BGP_NOTIFY_MAJOR_CAP:
2826 ND_PRINT((ndo, " subcode %s (%u)",
2827 tok2str(bgp_notify_minor_cap_values, "Unknown",
2828 bgpn_minor),
2829 bgpn_minor));
2830 break;
2831 case BGP_NOTIFY_MAJOR_CEASE:
2832 ND_PRINT((ndo, ", subcode %s (%u)",
2833 tok2str(bgp_notify_minor_cease_values, "Unknown",
2834 bgpn_minor),
2835 bgpn_minor));
2836
2837 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2838 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2839 */
2840 if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2841 tptr = dat + BGP_NOTIFICATION_SIZE;
2842 ND_TCHECK_7(tptr);
2843 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2844 tok2str(af_values, "Unknown",
2845 EXTRACT_BE_U_2(tptr)),
2846 EXTRACT_BE_U_2(tptr),
2847 tok2str(bgp_safi_values, "Unknown", EXTRACT_U_1((tptr + 2))),
2848 EXTRACT_U_1((tptr + 2)),
2849 EXTRACT_BE_U_4(tptr + 3)));
2850 }
2851 /*
2852 * draft-ietf-idr-shutdown describes a method to send a communication
2853 * intended for human consumption regarding the Administrative Shutdown
2854 */
2855 if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
2856 bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
2857 length >= BGP_NOTIFICATION_SIZE + 1) {
2858 tptr = dat + BGP_NOTIFICATION_SIZE;
2859 ND_TCHECK_1(tptr);
2860 shutdown_comm_length = EXTRACT_U_1(tptr);
2861 remainder_offset = 0;
2862 /* garbage, hexdump it all */
2863 if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN ||
2864 shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) {
2865 ND_PRINT((ndo, ", invalid Shutdown Communication length"));
2866 }
2867 else if (shutdown_comm_length == 0) {
2868 ND_PRINT((ndo, ", empty Shutdown Communication"));
2869 remainder_offset += 1;
2870 }
2871 /* a proper shutdown communication */
2872 else {
2873 ND_TCHECK_LEN(tptr + 1, shutdown_comm_length);
2874 ND_PRINT((ndo, ", Shutdown Communication (length: %u): \"", shutdown_comm_length));
2875 (void)fn_printn(ndo, tptr+1, shutdown_comm_length, NULL);
2876 ND_PRINT((ndo, "\""));
2877 remainder_offset += shutdown_comm_length + 1;
2878 }
2879 /* if there is trailing data, hexdump it */
2880 if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) {
2881 ND_PRINT((ndo, ", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE)));
2882 hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2883 }
2884 }
2885 break;
2886 default:
2887 break;
2888 }
2889
2890 return;
2891 trunc:
2892 ND_PRINT((ndo, "[|BGP]"));
2893 }
2894
2895 static void
2896 bgp_route_refresh_print(netdissect_options *ndo,
2897 const u_char *pptr, int len)
2898 {
2899 const struct bgp_route_refresh *bgp_route_refresh_header;
2900
2901 ND_TCHECK_LEN(pptr, BGP_ROUTE_REFRESH_SIZE);
2902
2903 /* some little sanity checking */
2904 if (len<BGP_ROUTE_REFRESH_SIZE)
2905 return;
2906
2907 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2908
2909 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)",
2910 tok2str(af_values,"Unknown",
2911 EXTRACT_BE_U_2(bgp_route_refresh_header->afi)),
2912 EXTRACT_BE_U_2(bgp_route_refresh_header->afi),
2913 tok2str(bgp_safi_values,"Unknown",
2914 EXTRACT_U_1(bgp_route_refresh_header->safi)),
2915 EXTRACT_U_1(bgp_route_refresh_header->safi)));
2916
2917 if (ndo->ndo_vflag > 1) {
2918 ND_TCHECK_LEN(pptr, len);
2919 print_unknown_data(ndo, pptr, "\n\t ", len);
2920 }
2921
2922 return;
2923 trunc:
2924 ND_PRINT((ndo, "[|BGP]"));
2925 }
2926
2927 static int
2928 bgp_pdu_print(netdissect_options *ndo,
2929 const u_char *dat, u_int length)
2930 {
2931 const struct bgp *bgp_header;
2932 uint8_t bgp_type;
2933
2934 ND_TCHECK_LEN(dat, BGP_SIZE);
2935 bgp_header = (const struct bgp *)dat;
2936 bgp_type = EXTRACT_U_1(bgp_header->bgp_type);
2937
2938 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2939 tok2str(bgp_msg_values, "Unknown", bgp_type),
2940 bgp_type,
2941 length));
2942
2943 switch (bgp_type) {
2944 case BGP_OPEN:
2945 bgp_open_print(ndo, dat, length);
2946 break;
2947 case BGP_UPDATE:
2948 bgp_update_print(ndo, dat, length);
2949 break;
2950 case BGP_NOTIFICATION:
2951 bgp_notification_print(ndo, dat, length);
2952 break;
2953 case BGP_KEEPALIVE:
2954 break;
2955 case BGP_ROUTE_REFRESH:
2956 bgp_route_refresh_print(ndo, dat, length);
2957 break;
2958 default:
2959 /* we have no decoder for the BGP message */
2960 ND_TCHECK_LEN(dat, length);
2961 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp_type));
2962 print_unknown_data(ndo, dat, "\n\t ", length);
2963 break;
2964 }
2965 return 1;
2966 trunc:
2967 ND_PRINT((ndo, "[|BGP]"));
2968 return 0;
2969 }
2970
2971 void
2972 bgp_print(netdissect_options *ndo,
2973 const u_char *dat, int length)
2974 {
2975 const u_char *p;
2976 const u_char *ep;
2977 const u_char *start;
2978 const u_char marker[] = {
2979 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2980 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2981 };
2982 const struct bgp *bgp_header;
2983 uint16_t hlen;
2984
2985 ep = dat + length;
2986 if (ndo->ndo_snapend < dat + length)
2987 ep = ndo->ndo_snapend;
2988
2989 ND_PRINT((ndo, ": BGP"));
2990
2991 if (ndo->ndo_vflag < 1) /* lets be less chatty */
2992 return;
2993
2994 p = dat;
2995 start = p;
2996 while (p < ep) {
2997 if (!ND_TTEST_1(p))
2998 break;
2999 if (EXTRACT_U_1(p) != 0xff) {
3000 p++;
3001 continue;
3002 }
3003
3004 if (!ND_TTEST_LEN(p, sizeof(marker)))
3005 break;
3006 if (memcmp(p, marker, sizeof(marker)) != 0) {
3007 p++;
3008 continue;
3009 }
3010
3011 /* found BGP header */
3012 ND_TCHECK_LEN(p, BGP_SIZE);
3013 bgp_header = (const struct bgp *)p;
3014
3015 if (start != p)
3016 ND_PRINT((ndo, " [|BGP]"));
3017
3018 hlen = EXTRACT_BE_U_2(bgp_header->bgp_len);
3019 if (hlen < BGP_SIZE) {
3020 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
3021 BGP_SIZE));
3022 break;
3023 }
3024
3025 if (ND_TTEST_LEN(p, hlen)) {
3026 if (!bgp_pdu_print(ndo, p, hlen))
3027 return;
3028 p += hlen;
3029 start = p;
3030 } else {
3031 ND_PRINT((ndo, "\n[|BGP %s]",
3032 tok2str(bgp_msg_values,
3033 "Unknown Message Type",
3034 EXTRACT_U_1(bgp_header->bgp_type))));
3035 break;
3036 }
3037 }
3038
3039 return;
3040
3041 trunc:
3042 ND_PRINT((ndo, " [|BGP]"));
3043 }
3044
3045 /*
3046 * Local Variables:
3047 * c-style: whitesmith
3048 * c-basic-offset: 4
3049 * End:
3050 */
[mirror] the TCPdump network dissector