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1 office 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@juniper.net) for more
30 * complete BGP support.
31 */
32  
33 #define NETDISSECT_REWORKED
34 #ifdef HAVE_CONFIG_H
35 #include "config.h"
36 #endif
37  
38 #include <tcpdump-stdinc.h>
39  
40 #include <stdio.h>
41 #include <string.h>
42  
43 #include "interface.h"
44 #include "addrtoname.h"
45 #include "extract.h"
46 #include "af.h"
47 #include "l2vpn.h"
48  
49 struct bgp {
50 uint8_t bgp_marker[16];
51 uint16_t bgp_len;
52 uint8_t bgp_type;
53 };
54 #define BGP_SIZE 19 /* unaligned */
55  
56 #define BGP_OPEN 1
57 #define BGP_UPDATE 2
58 #define BGP_NOTIFICATION 3
59 #define BGP_KEEPALIVE 4
60 #define BGP_ROUTE_REFRESH 5
61  
62 static const struct tok bgp_msg_values[] = {
63 { BGP_OPEN, "Open"},
64 { BGP_UPDATE, "Update"},
65 { BGP_NOTIFICATION, "Notification"},
66 { BGP_KEEPALIVE, "Keepalive"},
67 { BGP_ROUTE_REFRESH, "Route Refresh"},
68 { 0, NULL}
69 };
70  
71 struct bgp_open {
72 uint8_t bgpo_marker[16];
73 uint16_t bgpo_len;
74 uint8_t bgpo_type;
75 uint8_t bgpo_version;
76 uint16_t bgpo_myas;
77 uint16_t bgpo_holdtime;
78 uint32_t bgpo_id;
79 uint8_t bgpo_optlen;
80 /* options should follow */
81 };
82 #define BGP_OPEN_SIZE 29 /* unaligned */
83  
84 struct bgp_opt {
85 uint8_t bgpopt_type;
86 uint8_t bgpopt_len;
87 /* variable length */
88 };
89 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
90 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
91  
92 struct bgp_notification {
93 uint8_t bgpn_marker[16];
94 uint16_t bgpn_len;
95 uint8_t bgpn_type;
96 uint8_t bgpn_major;
97 uint8_t bgpn_minor;
98 };
99 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
100  
101 struct bgp_route_refresh {
102 uint8_t bgp_marker[16];
103 uint16_t len;
104 uint8_t type;
105 uint8_t afi[2]; /* the compiler messes this structure up */
106 uint8_t res; /* when doing misaligned sequences of int8 and int16 */
107 uint8_t safi; /* afi should be int16 - so we have to access it using */
108 }; /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh) */
109 #define BGP_ROUTE_REFRESH_SIZE 23
110  
111 #define bgp_attr_lenlen(flags, p) \
112 (((flags) & 0x10) ? 2 : 1)
113 #define bgp_attr_len(flags, p) \
114 (((flags) & 0x10) ? EXTRACT_16BITS(p) : *(p))
115  
116 #define BGPTYPE_ORIGIN 1
117 #define BGPTYPE_AS_PATH 2
118 #define BGPTYPE_NEXT_HOP 3
119 #define BGPTYPE_MULTI_EXIT_DISC 4
120 #define BGPTYPE_LOCAL_PREF 5
121 #define BGPTYPE_ATOMIC_AGGREGATE 6
122 #define BGPTYPE_AGGREGATOR 7
123 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
124 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC1998 */
125 #define BGPTYPE_CLUSTER_LIST 10 /* RFC1998 */
126 #define BGPTYPE_DPA 11 /* draft-ietf-idr-bgp-dpa */
127 #define BGPTYPE_ADVERTISERS 12 /* RFC1863 */
128 #define BGPTYPE_RCID_PATH 13 /* RFC1863 */
129 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC2283 */
130 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC2283 */
131 #define BGPTYPE_EXTD_COMMUNITIES 16 /* draft-ietf-idr-bgp-ext-communities */
132 #define BGPTYPE_AS4_PATH 17 /* RFC4893 */
133 #define BGPTYPE_AGGREGATOR4 18 /* RFC4893 */
134 #define BGPTYPE_PMSI_TUNNEL 22 /* draft-ietf-l3vpn-2547bis-mcast-bgp-02.txt */
135 #define BGPTYPE_ATTR_SET 128 /* draft-marques-ppvpn-ibgp */
136  
137 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
138  
139 static const struct tok bgp_attr_values[] = {
140 { BGPTYPE_ORIGIN, "Origin"},
141 { BGPTYPE_AS_PATH, "AS Path"},
142 { BGPTYPE_AS4_PATH, "AS4 Path"},
143 { BGPTYPE_NEXT_HOP, "Next Hop"},
144 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
145 { BGPTYPE_LOCAL_PREF, "Local Preference"},
146 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
147 { BGPTYPE_AGGREGATOR, "Aggregator"},
148 { BGPTYPE_AGGREGATOR4, "Aggregator4"},
149 { BGPTYPE_COMMUNITIES, "Community"},
150 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
151 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
152 { BGPTYPE_DPA, "DPA"},
153 { BGPTYPE_ADVERTISERS, "Advertisers"},
154 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"},
155 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
156 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
157 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
158 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
159 { BGPTYPE_ATTR_SET, "Attribute Set"},
160 { 255, "Reserved for development"},
161 { 0, NULL}
162 };
163  
164 #define BGP_AS_SET 1
165 #define BGP_AS_SEQUENCE 2
166 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
167 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
168  
169 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
170 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
171  
172 static const struct tok bgp_as_path_segment_open_values[] = {
173 { BGP_AS_SEQUENCE, ""},
174 { BGP_AS_SET, "{ "},
175 { BGP_CONFED_AS_SEQUENCE, "( "},
176 { BGP_CONFED_AS_SET, "({ "},
177 { 0, NULL}
178 };
179  
180 static const struct tok bgp_as_path_segment_close_values[] = {
181 { BGP_AS_SEQUENCE, ""},
182 { BGP_AS_SET, "}"},
183 { BGP_CONFED_AS_SEQUENCE, ")"},
184 { BGP_CONFED_AS_SET, "})"},
185 { 0, NULL}
186 };
187  
188 #define BGP_OPT_AUTH 1
189 #define BGP_OPT_CAP 2
190  
191  
192 static const struct tok bgp_opt_values[] = {
193 { BGP_OPT_AUTH, "Authentication Information"},
194 { BGP_OPT_CAP, "Capabilities Advertisement"},
195 { 0, NULL}
196 };
197  
198 #define BGP_CAPCODE_MP 1
199 #define BGP_CAPCODE_RR 2
200 #define BGP_CAPCODE_ORF 3 /* XXX */
201 #define BGP_CAPCODE_RESTART 64 /* draft-ietf-idr-restart-05 */
202 #define BGP_CAPCODE_AS_NEW 65 /* XXX */
203 #define BGP_CAPCODE_DYN_CAP 67 /* XXX */
204 #define BGP_CAPCODE_RR_CISCO 128
205  
206 static const struct tok bgp_capcode_values[] = {
207 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
208 { BGP_CAPCODE_RR, "Route Refresh"},
209 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
210 { BGP_CAPCODE_RESTART, "Graceful Restart"},
211 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
212 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
213 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
214 { 0, NULL}
215 };
216  
217 #define BGP_NOTIFY_MAJOR_MSG 1
218 #define BGP_NOTIFY_MAJOR_OPEN 2
219 #define BGP_NOTIFY_MAJOR_UPDATE 3
220 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
221 #define BGP_NOTIFY_MAJOR_FSM 5
222 #define BGP_NOTIFY_MAJOR_CEASE 6
223 #define BGP_NOTIFY_MAJOR_CAP 7
224  
225 static const struct tok bgp_notify_major_values[] = {
226 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
227 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
228 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
229 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
230 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
231 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
232 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"},
233 { 0, NULL}
234 };
235  
236 /* draft-ietf-idr-cease-subcode-02 */
237 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
238 static const struct tok bgp_notify_minor_cease_values[] = {
239 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
240 { 2, "Administratively Shutdown"},
241 { 3, "Peer Unconfigured"},
242 { 4, "Administratively Reset"},
243 { 5, "Connection Rejected"},
244 { 6, "Other Configuration Change"},
245 { 7, "Connection Collision Resolution"},
246 { 0, NULL}
247 };
248  
249 static const struct tok bgp_notify_minor_msg_values[] = {
250 { 1, "Connection Not Synchronized"},
251 { 2, "Bad Message Length"},
252 { 3, "Bad Message Type"},
253 { 0, NULL}
254 };
255  
256 static const struct tok bgp_notify_minor_open_values[] = {
257 { 1, "Unsupported Version Number"},
258 { 2, "Bad Peer AS"},
259 { 3, "Bad BGP Identifier"},
260 { 4, "Unsupported Optional Parameter"},
261 { 5, "Authentication Failure"},
262 { 6, "Unacceptable Hold Time"},
263 { 7, "Capability Message Error"},
264 { 0, NULL}
265 };
266  
267 static const struct tok bgp_notify_minor_update_values[] = {
268 { 1, "Malformed Attribute List"},
269 { 2, "Unrecognized Well-known Attribute"},
270 { 3, "Missing Well-known Attribute"},
271 { 4, "Attribute Flags Error"},
272 { 5, "Attribute Length Error"},
273 { 6, "Invalid ORIGIN Attribute"},
274 { 7, "AS Routing Loop"},
275 { 8, "Invalid NEXT_HOP Attribute"},
276 { 9, "Optional Attribute Error"},
277 { 10, "Invalid Network Field"},
278 { 11, "Malformed AS_PATH"},
279 { 0, NULL}
280 };
281  
282 static const struct tok bgp_notify_minor_cap_values[] = {
283 { 1, "Invalid Action Value" },
284 { 2, "Invalid Capability Length" },
285 { 3, "Malformed Capability Value" },
286 { 4, "Unsupported Capability Code" },
287 { 0, NULL }
288 };
289  
290 static const struct tok bgp_origin_values[] = {
291 { 0, "IGP"},
292 { 1, "EGP"},
293 { 2, "Incomplete"},
294 { 0, NULL}
295 };
296  
297 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1
298 #define BGP_PMSI_TUNNEL_LDP_P2MP 2
299 #define BGP_PMSI_TUNNEL_PIM_SSM 3
300 #define BGP_PMSI_TUNNEL_PIM_SM 4
301 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5
302 #define BGP_PMSI_TUNNEL_INGRESS 6
303 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7
304  
305 static const struct tok bgp_pmsi_tunnel_values[] = {
306 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
307 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
308 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
309 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
310 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
311 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
312 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
313 { 0, NULL}
314 };
315  
316 static const struct tok bgp_pmsi_flag_values[] = {
317 { 0x01, "Leaf Information required"},
318 { 0, NULL}
319 };
320  
321  
322 /* Subsequent address family identifier, RFC2283 section 7 */
323 #define SAFNUM_RES 0
324 #define SAFNUM_UNICAST 1
325 #define SAFNUM_MULTICAST 2
326 #define SAFNUM_UNIMULTICAST 3
327 /* labeled BGP RFC3107 */
328 #define SAFNUM_LABUNICAST 4
329 /* draft-ietf-l3vpn-2547bis-mcast-bgp-02.txt */
330 #define SAFNUM_MULTICAST_VPN 5
331 #define SAFNUM_TUNNEL 64 /* XXX */
332 #define SAFNUM_VPLS 65 /* XXX */
333 /* draft-nalawade-idr-mdt-safi-03 */
334 #define SAFNUM_MDT 66
335 /* Section 4.3.4 of draft-rosen-rfc2547bis-03.txt */
336 #define SAFNUM_VPNUNICAST 128
337 #define SAFNUM_VPNMULTICAST 129
338 #define SAFNUM_VPNUNIMULTICAST 130
339 /* draft-marques-ppvpn-rt-constrain-01.txt */
340 #define SAFNUM_RT_ROUTING_INFO 132
341  
342 #define BGP_VPN_RD_LEN 8
343  
344 static const struct tok bgp_safi_values[] = {
345 { SAFNUM_RES, "Reserved"},
346 { SAFNUM_UNICAST, "Unicast"},
347 { SAFNUM_MULTICAST, "Multicast"},
348 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
349 { SAFNUM_LABUNICAST, "labeled Unicast"},
350 { SAFNUM_TUNNEL, "Tunnel"},
351 { SAFNUM_VPLS, "VPLS"},
352 { SAFNUM_MDT, "MDT"},
353 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
354 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
355 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
356 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
357 { SAFNUM_MULTICAST_VPN, "Multicast VPN"},
358 { 0, NULL }
359 };
360  
361 /* well-known community */
362 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
363 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
364 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
365  
366 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */
367 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
368 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
369 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
370 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
371 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
372 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
373 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
374 /* rfc2547 bgp-mpls-vpns */
375 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
376 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatability */
377 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatability */
378 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatability */
379  
380 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
381 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatability */
382  
383 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
384 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatability */
385  
386 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
387  
388 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
389 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
390 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
391 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */
392  
393  
394 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */
395 #define BGP_EXT_COM_EIGRP_GEN 0x8800
396 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801
397 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
398 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803
399 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804
400 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
401  
402 static const struct tok bgp_extd_comm_flag_values[] = {
403 { 0x8000, "vendor-specific"},
404 { 0x4000, "non-transitive"},
405 { 0, NULL},
406 };
407  
408 static const struct tok bgp_extd_comm_subtype_values[] = {
409 { BGP_EXT_COM_RT_0, "target"},
410 { BGP_EXT_COM_RT_1, "target"},
411 { BGP_EXT_COM_RT_2, "target"},
412 { BGP_EXT_COM_RO_0, "origin"},
413 { BGP_EXT_COM_RO_1, "origin"},
414 { BGP_EXT_COM_RO_2, "origin"},
415 { BGP_EXT_COM_LINKBAND, "link-BW"},
416 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
417 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
418 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
419 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
420 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
421 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
422 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
423 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
424 { BGP_EXT_COM_L2INFO, "layer2-info"},
425 { BGP_EXT_COM_EIGRP_GEN , "eigrp-general-route (flag, tag)" },
426 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY , "eigrp-route-metric (AS, delay)" },
427 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW , "eigrp-route-metric (reliability, nexthop, bandwidth)" },
428 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU , "eigrp-route-metric (load, MTU)" },
429 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID , "eigrp-external-route (remote-AS, remote-ID)" },
430 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC , "eigrp-external-route (remote-proto, remote-metric)" },
431 { BGP_EXT_COM_SOURCE_AS, "source-AS" },
432 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
433 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
434 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
435 { 0, NULL},
436 };
437  
438 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
439 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
440 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
441 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
442 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
443 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
444 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
445 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
446  
447 static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
448 { BGP_OSPF_RTYPE_RTR, "Router" },
449 { BGP_OSPF_RTYPE_NET, "Network" },
450 { BGP_OSPF_RTYPE_SUM, "Summary" },
451 { BGP_OSPF_RTYPE_EXT, "External" },
452 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
453 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
454 { 0, NULL },
455 };
456  
457 #define TOKBUFSIZE 128
458 static char astostr[20];
459  
460 /*
461 * as_printf
462 *
463 * Convert an AS number into a string and return string pointer.
464 *
465 * Depending on bflag is set or not, AS number is converted into ASDOT notation
466 * or plain number notation.
467 *
468 */
469 static char *
470 as_printf(netdissect_options *ndo,
471 char *str, int size, u_int asnum)
472 {
473 if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
474 snprintf(str, size, "%u", asnum);
475 } else {
476 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
477 }
478 return str;
479 }
480  
481 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
482  
483 int
484 decode_prefix4(netdissect_options *ndo,
485 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
486 {
487 struct in_addr addr;
488 u_int plen, plenbytes;
489  
490 ND_TCHECK(pptr[0]);
491 ITEMCHECK(1);
492 plen = pptr[0];
493 if (32 < plen)
494 return -1;
495 itemlen -= 1;
496  
497 memset(&addr, 0, sizeof(addr));
498 plenbytes = (plen + 7) / 8;
499 ND_TCHECK2(pptr[1], plenbytes);
500 ITEMCHECK(plenbytes);
501 memcpy(&addr, &pptr[1], plenbytes);
502 if (plen % 8) {
503 ((u_char *)&addr)[plenbytes - 1] &=
504 ((0xff00 >> (plen % 8)) & 0xff);
505 }
506 snprintf(buf, buflen, "%s/%d", getname(ndo, (u_char *)&addr), plen);
507 return 1 + plenbytes;
508  
509 trunc:
510 return -2;
511  
512 badtlv:
513 return -3;
514 }
515  
516 static int
517 decode_labeled_prefix4(netdissect_options *ndo,
518 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
519 {
520 struct in_addr addr;
521 u_int plen, plenbytes;
522  
523 /* prefix length and label = 4 bytes */
524 ND_TCHECK2(pptr[0], 4);
525 ITEMCHECK(4);
526 plen = pptr[0]; /* get prefix length */
527  
528 /* this is one of the weirdnesses of rfc3107
529 the label length (actually the label + COS bits)
530 is added to the prefix length;
531 we also do only read out just one label -
532 there is no real application for advertisement of
533 stacked labels in a single BGP message
534 */
535  
536 if (24 > plen)
537 return -1;
538  
539 plen-=24; /* adjust prefixlen - labellength */
540  
541 if (32 < plen)
542 return -1;
543 itemlen -= 4;
544  
545 memset(&addr, 0, sizeof(addr));
546 plenbytes = (plen + 7) / 8;
547 ND_TCHECK2(pptr[4], plenbytes);
548 ITEMCHECK(plenbytes);
549 memcpy(&addr, &pptr[4], plenbytes);
550 if (plen % 8) {
551 ((u_char *)&addr)[plenbytes - 1] &=
552 ((0xff00 >> (plen % 8)) & 0xff);
553 }
554 /* the label may get offsetted by 4 bits so lets shift it right */
555 snprintf(buf, buflen, "%s/%d, label:%u %s",
556 getname(ndo, (u_char *)&addr),
557 plen,
558 EXTRACT_24BITS(pptr+1)>>4,
559 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
560  
561 return 4 + plenbytes;
562  
563 trunc:
564 return -2;
565  
566 badtlv:
567 return -3;
568 }
569  
570 /*
571 * bgp_vpn_ip_print
572 *
573 * print an ipv4 or ipv6 address into a buffer dependend on address length.
574 */
575 static char *
576 bgp_vpn_ip_print(netdissect_options *ndo,
577 const u_char *pptr, u_int addr_length)
578 {
579  
580 /* worst case string is s fully formatted v6 address */
581 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
582 char *pos = addr;
583  
584 switch(addr_length) {
585 case (sizeof(struct in_addr) << 3): /* 32 */
586 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
587 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
588 break;
589 #ifdef INET6
590 case (sizeof(struct in6_addr) << 3): /* 128 */
591 ND_TCHECK2(pptr[0], sizeof(struct in6_addr));
592 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
593 break;
594 #endif
595 default:
596 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
597 break;
598 }
599 pos += strlen(pos);
600  
601 trunc:
602 *(pos) = '\0';
603 return (addr);
604 }
605  
606 /*
607 * bgp_vpn_sg_print
608 *
609 * print an multicast s,g entry into a buffer.
610 * the s,g entry is encoded like this.
611 *
612 * +-----------------------------------+
613 * | Multicast Source Length (1 octet) |
614 * +-----------------------------------+
615 * | Multicast Source (Variable) |
616 * +-----------------------------------+
617 * | Multicast Group Length (1 octet) |
618 * +-----------------------------------+
619 * | Multicast Group (Variable) |
620 * +-----------------------------------+
621 *
622 * return the number of bytes read from the wire.
623 */
624 static int
625 bgp_vpn_sg_print(netdissect_options *ndo,
626 const u_char *pptr, char *buf, u_int buflen)
627 {
628 uint8_t addr_length;
629 u_int total_length, offset;
630  
631 total_length = 0;
632  
633 /* Source address length, encoded in bits */
634 ND_TCHECK2(pptr[0], 1);
635 addr_length = *pptr++;
636  
637 /* Source address */
638 ND_TCHECK2(pptr[0], (addr_length >> 3));
639 total_length += (addr_length >> 3) + 1;
640 offset = strlen(buf);
641 if (addr_length) {
642 snprintf(buf + offset, buflen - offset, ", Source %s",
643 bgp_vpn_ip_print(ndo, pptr, addr_length));
644 pptr += (addr_length >> 3);
645 }
646  
647 /* Group address length, encoded in bits */
648 ND_TCHECK2(pptr[0], 1);
649 addr_length = *pptr++;
650  
651 /* Group address */
652 ND_TCHECK2(pptr[0], (addr_length >> 3));
653 total_length += (addr_length >> 3) + 1;
654 offset = strlen(buf);
655 if (addr_length) {
656 snprintf(buf + offset, buflen - offset, ", Group %s",
657 bgp_vpn_ip_print(ndo, pptr, addr_length));
658 pptr += (addr_length >> 3);
659 }
660  
661 trunc:
662 return (total_length);
663 }
664  
665  
666 /* RDs and RTs share the same semantics
667 * we use bgp_vpn_rd_print for
668 * printing route targets inside a NLRI */
669 char *
670 bgp_vpn_rd_print(netdissect_options *ndo,
671 const u_char *pptr)
672 {
673 /* allocate space for the largest possible string */
674 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
675 char *pos = rd;
676  
677 /* ok lets load the RD format */
678 switch (EXTRACT_16BITS(pptr)) {
679  
680 /* 2-byte-AS:number fmt*/
681 case 0:
682 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
683 EXTRACT_16BITS(pptr+2),
684 EXTRACT_32BITS(pptr+4),
685 *(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7));
686 break;
687 /* IP-address:AS fmt*/
688  
689 case 1:
690 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
691 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6));
692 break;
693  
694 /* 4-byte-AS:number fmt*/
695 case 2:
696 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
697 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+2)),
698 EXTRACT_16BITS(pptr+6), *(pptr+2), *(pptr+3), *(pptr+4),
699 *(pptr+5), EXTRACT_16BITS(pptr+6));
700 break;
701 default:
702 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
703 break;
704 }
705 pos += strlen(pos);
706 *(pos) = '\0';
707 return (rd);
708 }
709  
710 static int
711 decode_rt_routing_info(netdissect_options *ndo,
712 const u_char *pptr, char *buf, u_int buflen)
713 {
714 uint8_t route_target[8];
715 u_int plen;
716  
717 ND_TCHECK(pptr[0]);
718 plen = pptr[0]; /* get prefix length */
719  
720 if (0 == plen) {
721 snprintf(buf, buflen, "default route target");
722 return 1;
723 }
724  
725 if (32 > plen)
726 return -1;
727  
728 plen-=32; /* adjust prefix length */
729  
730 if (64 < plen)
731 return -1;
732  
733 memset(&route_target, 0, sizeof(route_target));
734 ND_TCHECK2(pptr[1], (plen + 7) / 8);
735 memcpy(&route_target, &pptr[1], (plen + 7) / 8);
736 if (plen % 8) {
737 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
738 ((0xff00 >> (plen % 8)) & 0xff);
739 }
740 snprintf(buf, buflen, "origin AS: %s, route target %s",
741 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+1)),
742 bgp_vpn_rd_print(ndo, (u_char *)&route_target));
743  
744 return 5 + (plen + 7) / 8;
745  
746 trunc:
747 return -2;
748 }
749  
750 static int
751 decode_labeled_vpn_prefix4(netdissect_options *ndo,
752 const u_char *pptr, char *buf, u_int buflen)
753 {
754 struct in_addr addr;
755 u_int plen;
756  
757 ND_TCHECK(pptr[0]);
758 plen = pptr[0]; /* get prefix length */
759  
760 if ((24+64) > plen)
761 return -1;
762  
763 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
764  
765 if (32 < plen)
766 return -1;
767  
768 memset(&addr, 0, sizeof(addr));
769 ND_TCHECK2(pptr[12], (plen + 7) / 8);
770 memcpy(&addr, &pptr[12], (plen + 7) / 8);
771 if (plen % 8) {
772 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
773 ((0xff00 >> (plen % 8)) & 0xff);
774 }
775 /* the label may get offsetted by 4 bits so lets shift it right */
776 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
777 bgp_vpn_rd_print(ndo, pptr+4),
778 getname(ndo, (u_char *)&addr),
779 plen,
780 EXTRACT_24BITS(pptr+1)>>4,
781 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
782  
783 return 12 + (plen + 7) / 8;
784  
785 trunc:
786 return -2;
787 }
788  
789 /*
790 * +-------------------------------+
791 * | |
792 * | RD:IPv4-address (12 octets) |
793 * | |
794 * +-------------------------------+
795 * | MDT Group-address (4 octets) |
796 * +-------------------------------+
797 */
798  
799 #define MDT_VPN_NLRI_LEN 16
800  
801 static int
802 decode_mdt_vpn_nlri(netdissect_options *ndo,
803 const u_char *pptr, char *buf, u_int buflen)
804 {
805  
806 const u_char *rd;
807 const u_char *vpn_ip;
808  
809 ND_TCHECK(pptr[0]);
810  
811 /* if the NLRI is not predefined length, quit.*/
812 if (*pptr != MDT_VPN_NLRI_LEN * 8)
813 return -1;
814 pptr++;
815  
816 /* RD */
817 ND_TCHECK2(pptr[0], 8);
818 rd = pptr;
819 pptr+=8;
820  
821 /* IPv4 address */
822 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
823 vpn_ip = pptr;
824 pptr+=sizeof(struct in_addr);
825  
826 /* MDT Group Address */
827 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
828  
829 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
830 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
831  
832 return MDT_VPN_NLRI_LEN + 1;
833  
834 trunc:
835  
836 return -2;
837 }
838  
839 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
840 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
841 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
842 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
843 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
844 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
845 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
846  
847 static const struct tok bgp_multicast_vpn_route_type_values[] = {
848 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
849 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
850 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
851 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
852 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
853 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
854 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
855 };
856  
857 static int
858 decode_multicast_vpn(netdissect_options *ndo,
859 const u_char *pptr, char *buf, u_int buflen)
860 {
861 uint8_t route_type, route_length, addr_length, sg_length;
862 u_int offset;
863  
864 ND_TCHECK2(pptr[0], 2);
865 route_type = *pptr++;
866 route_length = *pptr++;
867  
868 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
869 tok2str(bgp_multicast_vpn_route_type_values,
870 "Unknown", route_type),
871 route_type, route_length);
872  
873 switch(route_type) {
874 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
875 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
876 offset = strlen(buf);
877 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
878 bgp_vpn_rd_print(ndo, pptr),
879 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
880 (route_length - BGP_VPN_RD_LEN) << 3));
881 break;
882 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
883 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4);
884 offset = strlen(buf);
885 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
886 bgp_vpn_rd_print(ndo, pptr),
887 as_printf(ndo, astostr, sizeof(astostr),
888 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
889 break;
890  
891 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
892 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
893 offset = strlen(buf);
894 snprintf(buf + offset, buflen - offset, ", RD: %s",
895 bgp_vpn_rd_print(ndo, pptr));
896 pptr += BGP_VPN_RD_LEN;
897  
898 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
899 addr_length = route_length - sg_length;
900  
901 ND_TCHECK2(pptr[0], addr_length);
902 offset = strlen(buf);
903 snprintf(buf + offset, buflen - offset, ", Originator %s",
904 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
905 break;
906  
907 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
908 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
909 offset = strlen(buf);
910 snprintf(buf + offset, buflen - offset, ", RD: %s",
911 bgp_vpn_rd_print(ndo, pptr));
912 pptr += BGP_VPN_RD_LEN;
913  
914 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
915 break;
916  
917 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
918 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
919 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
920 offset = strlen(buf);
921 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
922 bgp_vpn_rd_print(ndo, pptr),
923 as_printf(ndo, astostr, sizeof(astostr),
924 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
925 pptr += BGP_VPN_RD_LEN;
926  
927 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
928 break;
929  
930 /*
931 * no per route-type printing yet.
932 */
933 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
934 default:
935 break;
936 }
937  
938 return route_length + 2;
939  
940 trunc:
941 return -2;
942 }
943  
944 /*
945 * As I remember, some versions of systems have an snprintf() that
946 * returns -1 if the buffer would have overflowed. If the return
947 * value is negative, set buflen to 0, to indicate that we've filled
948 * the buffer up.
949 *
950 * If the return value is greater than buflen, that means that
951 * the buffer would have overflowed; again, set buflen to 0 in
952 * that case.
953 */
954 #define UPDATE_BUF_BUFLEN(buf, buflen, strlen) \
955 if (strlen<0) \
956 buflen=0; \
957 else if ((u_int)strlen>buflen) \
958 buflen=0; \
959 else { \
960 buflen-=strlen; \
961 buf+=strlen; \
962 }
963  
964 static int
965 decode_labeled_vpn_l2(netdissect_options *ndo,
966 const u_char *pptr, char *buf, u_int buflen)
967 {
968 int plen,tlen,strlen,tlv_type,tlv_len,ttlv_len;
969  
970 ND_TCHECK2(pptr[0], 2);
971 plen=EXTRACT_16BITS(pptr);
972 tlen=plen;
973 pptr+=2;
974 /* Old and new L2VPN NLRI share AFI/SAFI
975 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
976 * and > 17 as old format. Complain for the middle case
977 */
978 if (plen==12) {
979 /* assume AD-only with RD, BGPNH */
980 ND_TCHECK2(pptr[0],12);
981 buf[0]='\0';
982 strlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s",
983 bgp_vpn_rd_print(ndo, pptr),
984 /* need something like getname(ndo, ) here */
985 getname(ndo, pptr+8)
986 );
987 UPDATE_BUF_BUFLEN(buf, buflen, strlen);
988 pptr+=12;
989 tlen-=12;
990 return plen;
991 } else if (plen>17) {
992 /* assume old format */
993 /* RD, ID, LBLKOFF, LBLBASE */
994  
995 ND_TCHECK2(pptr[0],15);
996 buf[0]='\0';
997 strlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
998 bgp_vpn_rd_print(ndo, pptr),
999 EXTRACT_16BITS(pptr+8),
1000 EXTRACT_16BITS(pptr+10),
1001 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1002 UPDATE_BUF_BUFLEN(buf, buflen, strlen);
1003 pptr+=15;
1004 tlen-=15;
1005  
1006 /* ok now the variable part - lets read out TLVs*/
1007 while (tlen>0) {
1008 if (tlen < 3)
1009 return -1;
1010 ND_TCHECK2(pptr[0], 3);
1011 tlv_type=*pptr++;
1012 tlv_len=EXTRACT_16BITS(pptr);
1013 ttlv_len=tlv_len;
1014 pptr+=2;
1015  
1016 switch(tlv_type) {
1017 case 1:
1018 if (buflen!=0) {
1019 strlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1020 tlv_type,
1021 tlv_len);
1022 UPDATE_BUF_BUFLEN(buf, buflen, strlen);
1023 }
1024 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
1025 while (ttlv_len>0) {
1026 ND_TCHECK(pptr[0]);
1027 if (buflen!=0) {
1028 strlen=snprintf(buf,buflen, "%02x",*pptr++);
1029 UPDATE_BUF_BUFLEN(buf, buflen, strlen);
1030 }
1031 ttlv_len--;
1032 }
1033 break;
1034 default:
1035 if (buflen!=0) {
1036 strlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1037 tlv_type,
1038 tlv_len);
1039 UPDATE_BUF_BUFLEN(buf, buflen, strlen);
1040 }
1041 break;
1042 }
1043 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
1044 }
1045 return plen+2;
1046  
1047 } else {
1048 /* complain bitterly ? */
1049 /* fall through */
1050 goto trunc;
1051 }
1052  
1053 trunc:
1054 return -2;
1055 }
1056  
1057 #ifdef INET6
1058 int
1059 decode_prefix6(netdissect_options *ndo,
1060 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1061 {
1062 struct in6_addr addr;
1063 u_int plen, plenbytes;
1064  
1065 ND_TCHECK(pd[0]);
1066 ITEMCHECK(1);
1067 plen = pd[0];
1068 if (128 < plen)
1069 return -1;
1070 itemlen -= 1;
1071  
1072 memset(&addr, 0, sizeof(addr));
1073 plenbytes = (plen + 7) / 8;
1074 ND_TCHECK2(pd[1], plenbytes);
1075 ITEMCHECK(plenbytes);
1076 memcpy(&addr, &pd[1], plenbytes);
1077 if (plen % 8) {
1078 addr.s6_addr[plenbytes - 1] &=
1079 ((0xff00 >> (plen % 8)) & 0xff);
1080 }
1081 snprintf(buf, buflen, "%s/%d", getname6(ndo, (u_char *)&addr), plen);
1082 return 1 + plenbytes;
1083  
1084 trunc:
1085 return -2;
1086  
1087 badtlv:
1088 return -3;
1089 }
1090  
1091 static int
1092 decode_labeled_prefix6(netdissect_options *ndo,
1093 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1094 {
1095 struct in6_addr addr;
1096 u_int plen, plenbytes;
1097  
1098 /* prefix length and label = 4 bytes */
1099 ND_TCHECK2(pptr[0], 4);
1100 ITEMCHECK(4);
1101 plen = pptr[0]; /* get prefix length */
1102  
1103 if (24 > plen)
1104 return -1;
1105  
1106 plen-=24; /* adjust prefixlen - labellength */
1107  
1108 if (128 < plen)
1109 return -1;
1110 itemlen -= 4;
1111  
1112 memset(&addr, 0, sizeof(addr));
1113 plenbytes = (plen + 7) / 8;
1114 ND_TCHECK2(pptr[4], plenbytes);
1115 memcpy(&addr, &pptr[4], plenbytes);
1116 if (plen % 8) {
1117 addr.s6_addr[plenbytes - 1] &=
1118 ((0xff00 >> (plen % 8)) & 0xff);
1119 }
1120 /* the label may get offsetted by 4 bits so lets shift it right */
1121 snprintf(buf, buflen, "%s/%d, label:%u %s",
1122 getname6(ndo, (u_char *)&addr),
1123 plen,
1124 EXTRACT_24BITS(pptr+1)>>4,
1125 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1126  
1127 return 4 + plenbytes;
1128  
1129 trunc:
1130 return -2;
1131  
1132 badtlv:
1133 return -3;
1134 }
1135  
1136 static int
1137 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1138 const u_char *pptr, char *buf, u_int buflen)
1139 {
1140 struct in6_addr addr;
1141 u_int plen;
1142  
1143 ND_TCHECK(pptr[0]);
1144 plen = pptr[0]; /* get prefix length */
1145  
1146 if ((24+64) > plen)
1147 return -1;
1148  
1149 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1150  
1151 if (128 < plen)
1152 return -1;
1153  
1154 memset(&addr, 0, sizeof(addr));
1155 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1156 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1157 if (plen % 8) {
1158 addr.s6_addr[(plen + 7) / 8 - 1] &=
1159 ((0xff00 >> (plen % 8)) & 0xff);
1160 }
1161 /* the label may get offsetted by 4 bits so lets shift it right */
1162 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1163 bgp_vpn_rd_print(ndo, pptr+4),
1164 getname6(ndo, (u_char *)&addr),
1165 plen,
1166 EXTRACT_24BITS(pptr+1)>>4,
1167 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1168  
1169 return 12 + (plen + 7) / 8;
1170  
1171 trunc:
1172 return -2;
1173 }
1174 #endif
1175  
1176 static int
1177 decode_clnp_prefix(netdissect_options *ndo,
1178 const u_char *pptr, char *buf, u_int buflen)
1179 {
1180 uint8_t addr[19];
1181 u_int plen;
1182  
1183 ND_TCHECK(pptr[0]);
1184 plen = pptr[0]; /* get prefix length */
1185  
1186 if (152 < plen)
1187 return -1;
1188  
1189 memset(&addr, 0, sizeof(addr));
1190 ND_TCHECK2(pptr[4], (plen + 7) / 8);
1191 memcpy(&addr, &pptr[4], (plen + 7) / 8);
1192 if (plen % 8) {
1193 addr[(plen + 7) / 8 - 1] &=
1194 ((0xff00 >> (plen % 8)) & 0xff);
1195 }
1196 snprintf(buf, buflen, "%s/%d",
1197 isonsap_string(addr,(plen + 7) / 8),
1198 plen);
1199  
1200 return 1 + (plen + 7) / 8;
1201  
1202 trunc:
1203 return -2;
1204 }
1205  
1206 static int
1207 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1208 const u_char *pptr, char *buf, u_int buflen)
1209 {
1210 uint8_t addr[19];
1211 u_int plen;
1212  
1213 ND_TCHECK(pptr[0]);
1214 plen = pptr[0]; /* get prefix length */
1215  
1216 if ((24+64) > plen)
1217 return -1;
1218  
1219 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1220  
1221 if (152 < plen)
1222 return -1;
1223  
1224 memset(&addr, 0, sizeof(addr));
1225 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1226 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1227 if (plen % 8) {
1228 addr[(plen + 7) / 8 - 1] &=
1229 ((0xff00 >> (plen % 8)) & 0xff);
1230 }
1231 /* the label may get offsetted by 4 bits so lets shift it right */
1232 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1233 bgp_vpn_rd_print(ndo, pptr+4),
1234 isonsap_string(addr,(plen + 7) / 8),
1235 plen,
1236 EXTRACT_24BITS(pptr+1)>>4,
1237 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1238  
1239 return 12 + (plen + 7) / 8;
1240  
1241 trunc:
1242 return -2;
1243 }
1244  
1245 /*
1246 * bgp_attr_get_as_size
1247 *
1248 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1249 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1250 * support, exchange AS-Path with the same path-attribute type value 0x02.
1251 */
1252 static int
1253 bgp_attr_get_as_size(netdissect_options *ndo,
1254 uint8_t bgpa_type, const u_char *pptr, int len)
1255 {
1256 const u_char *tptr = pptr;
1257  
1258 /*
1259 * If the path attribute is the optional AS4 path type, then we already
1260 * know, that ASs must be encoded in 4 byte format.
1261 */
1262 if (bgpa_type == BGPTYPE_AS4_PATH) {
1263 return 4;
1264 }
1265  
1266 /*
1267 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1268 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1269 * each.
1270 */
1271 while (tptr < pptr + len) {
1272 ND_TCHECK(tptr[0]);
1273  
1274 /*
1275 * If we do not find a valid segment type, our guess might be wrong.
1276 */
1277 if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) {
1278 goto trunc;
1279 }
1280 ND_TCHECK(tptr[1]);
1281 tptr += 2 + tptr[1] * 2;
1282 }
1283  
1284 /*
1285 * If we correctly reached end of the AS path attribute data content,
1286 * then most likely ASs were indeed encoded as 2 bytes.
1287 */
1288 if (tptr == pptr + len) {
1289 return 2;
1290 }
1291  
1292 trunc:
1293  
1294 /*
1295 * We can come here, either we did not have enough data, or if we
1296 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1297 * so that calller can try to decode each AS as of 4 bytes. If indeed
1298 * there was not enough data, it will crib and end the parse anyways.
1299 */
1300 return 4;
1301 }
1302  
1303 static int
1304 bgp_attr_print(netdissect_options *ndo,
1305 u_int atype, const u_char *pptr, u_int len)
1306 {
1307 int i;
1308 uint16_t af;
1309 uint8_t safi, snpa, nhlen;
1310 union { /* copy buffer for bandwidth values */
1311 float f;
1312 uint32_t i;
1313 } bw;
1314 int advance;
1315 u_int tlen;
1316 const u_char *tptr;
1317 char buf[MAXHOSTNAMELEN + 100];
1318 char tokbuf[TOKBUFSIZE];
1319 int as_size;
1320  
1321 tptr = pptr;
1322 tlen=len;
1323  
1324 switch (atype) {
1325 case BGPTYPE_ORIGIN:
1326 if (len != 1)
1327 ND_PRINT((ndo, "invalid len"));
1328 else {
1329 ND_TCHECK(*tptr);
1330 ND_PRINT((ndo, "%s", tok2strbuf(bgp_origin_values,
1331 "Unknown Origin Typecode",
1332 tptr[0],
1333 tokbuf, sizeof(tokbuf))));
1334 }
1335 break;
1336  
1337  
1338 /*
1339 * Process AS4 byte path and AS2 byte path attributes here.
1340 */
1341 case BGPTYPE_AS4_PATH:
1342 case BGPTYPE_AS_PATH:
1343 if (len % 2) {
1344 ND_PRINT((ndo, "invalid len"));
1345 break;
1346 }
1347 if (!len) {
1348 ND_PRINT((ndo, "empty"));
1349 break;
1350 }
1351  
1352 /*
1353 * BGP updates exchanged between New speakers that support 4
1354 * byte AS, ASs are always encoded in 4 bytes. There is no
1355 * definitive way to find this, just by the packet's
1356 * contents. So, check for packet's TLV's sanity assuming
1357 * 2 bytes first, and it does not pass, assume that ASs are
1358 * encoded in 4 bytes format and move on.
1359 */
1360 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1361  
1362 while (tptr < pptr + len) {
1363 ND_TCHECK(tptr[0]);
1364 ND_PRINT((ndo, "%s", tok2strbuf(bgp_as_path_segment_open_values,
1365 "?", tptr[0],
1366 tokbuf, sizeof(tokbuf))));
1367 for (i = 0; i < tptr[1] * as_size; i += as_size) {
1368 ND_TCHECK2(tptr[2 + i], as_size);
1369 ND_PRINT((ndo, "%s ",
1370 as_printf(ndo, astostr, sizeof(astostr),
1371 as_size == 2 ?
1372 EXTRACT_16BITS(&tptr[2 + i]) :
1373 EXTRACT_32BITS(&tptr[2 + i]))));
1374 }
1375 ND_TCHECK(tptr[0]);
1376 ND_PRINT((ndo, "%s", tok2strbuf(bgp_as_path_segment_close_values,
1377 "?", tptr[0],
1378 tokbuf, sizeof(tokbuf))));
1379 ND_TCHECK(tptr[1]);
1380 tptr += 2 + tptr[1] * as_size;
1381 }
1382 break;
1383 case BGPTYPE_NEXT_HOP:
1384 if (len != 4)
1385 ND_PRINT((ndo, "invalid len"));
1386 else {
1387 ND_TCHECK2(tptr[0], 4);
1388 ND_PRINT((ndo, "%s", getname(ndo, tptr)));
1389 }
1390 break;
1391 case BGPTYPE_MULTI_EXIT_DISC:
1392 case BGPTYPE_LOCAL_PREF:
1393 if (len != 4)
1394 ND_PRINT((ndo, "invalid len"));
1395 else {
1396 ND_TCHECK2(tptr[0], 4);
1397 ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr)));
1398 }
1399 break;
1400 case BGPTYPE_ATOMIC_AGGREGATE:
1401 if (len != 0)
1402 ND_PRINT((ndo, "invalid len"));
1403 break;
1404 case BGPTYPE_AGGREGATOR:
1405  
1406 /*
1407 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1408 * the length of this PA can be either 6 bytes or 8 bytes.
1409 */
1410 if (len != 6 && len != 8) {
1411 ND_PRINT((ndo, "invalid len"));
1412 break;
1413 }
1414 ND_TCHECK2(tptr[0], len);
1415 if (len == 6) {
1416 ND_PRINT((ndo, " AS #%s, origin %s",
1417 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)),
1418 getname(ndo, tptr + 2)));
1419 } else {
1420 ND_PRINT((ndo, " AS #%s, origin %s",
1421 as_printf(ndo, astostr, sizeof(astostr),
1422 EXTRACT_32BITS(tptr)), getname(ndo, tptr + 4)));
1423 }
1424 break;
1425 case BGPTYPE_AGGREGATOR4:
1426 if (len != 8) {
1427 ND_PRINT((ndo, "invalid len"));
1428 break;
1429 }
1430 ND_TCHECK2(tptr[0], 8);
1431 ND_PRINT((ndo, " AS #%s, origin %s",
1432 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)),
1433 getname(ndo, tptr + 4)));
1434 break;
1435 case BGPTYPE_COMMUNITIES:
1436 if (len % 4) {
1437 ND_PRINT((ndo, "invalid len"));
1438 break;
1439 }
1440 while (tlen>0) {
1441 uint32_t comm;
1442 ND_TCHECK2(tptr[0], 4);
1443 comm = EXTRACT_32BITS(tptr);
1444 switch (comm) {
1445 case BGP_COMMUNITY_NO_EXPORT:
1446 ND_PRINT((ndo, " NO_EXPORT"));
1447 break;
1448 case BGP_COMMUNITY_NO_ADVERT:
1449 ND_PRINT((ndo, " NO_ADVERTISE"));
1450 break;
1451 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1452 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1453 break;
1454 default:
1455 ND_PRINT((ndo, "%u:%u%s",
1456 (comm >> 16) & 0xffff,
1457 comm & 0xffff,
1458 (tlen>4) ? ", " : ""));
1459 break;
1460 }
1461 tlen -=4;
1462 tptr +=4;
1463 }
1464 break;
1465 case BGPTYPE_ORIGINATOR_ID:
1466 if (len != 4) {
1467 ND_PRINT((ndo, "invalid len"));
1468 break;
1469 }
1470 ND_TCHECK2(tptr[0], 4);
1471 ND_PRINT((ndo, "%s",getname(ndo, tptr)));
1472 break;
1473 case BGPTYPE_CLUSTER_LIST:
1474 if (len % 4) {
1475 ND_PRINT((ndo, "invalid len"));
1476 break;
1477 }
1478 while (tlen>0) {
1479 ND_TCHECK2(tptr[0], 4);
1480 ND_PRINT((ndo, "%s%s",
1481 getname(ndo, tptr),
1482 (tlen>4) ? ", " : ""));
1483 tlen -=4;
1484 tptr +=4;
1485 }
1486 break;
1487 case BGPTYPE_MP_REACH_NLRI:
1488 ND_TCHECK2(tptr[0], 3);
1489 af = EXTRACT_16BITS(tptr);
1490 safi = tptr[2];
1491  
1492 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1493 tok2strbuf(af_values, "Unknown AFI", af,
1494 tokbuf, sizeof(tokbuf)),
1495 af,
1496 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1497 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi,
1498 tokbuf, sizeof(tokbuf)),
1499 safi));
1500  
1501 switch(af<<8 | safi) {
1502 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1503 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1504 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1505 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1506 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1507 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1508 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1509 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1510 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1511 case (AFNUM_INET<<8 | SAFNUM_MDT):
1512 #ifdef INET6
1513 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1514 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1515 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1516 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1517 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1518 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1519 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1520 #endif
1521 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1522 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1523 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1524 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1525 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1526 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1527 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1528 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1529 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1530 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1531 break;
1532 default:
1533 ND_TCHECK2(tptr[0], tlen);
1534 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1535 if (ndo->ndo_vflag <= 1)
1536 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1537 goto done;
1538 break;
1539 }
1540  
1541 tptr +=3;
1542  
1543 ND_TCHECK(tptr[0]);
1544 nhlen = tptr[0];
1545 tlen = nhlen;
1546 tptr++;
1547  
1548 if (tlen) {
1549 int nnh = 0;
1550 ND_PRINT((ndo, "\n\t nexthop: "));
1551 while (tlen > 0) {
1552 if ( nnh++ > 0 ) {
1553 ND_PRINT((ndo, ", " ));
1554 }
1555 switch(af<<8 | safi) {
1556 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1557 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1558 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1559 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1560 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1561 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1562 case (AFNUM_INET<<8 | SAFNUM_MDT):
1563 if (tlen < (int)sizeof(struct in_addr)) {
1564 ND_PRINT((ndo, "invalid len"));
1565 tlen = 0;
1566 } else {
1567 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1568 ND_PRINT((ndo, "%s",getname(ndo, tptr)));
1569 tlen -= sizeof(struct in_addr);
1570 tptr += sizeof(struct in_addr);
1571 }
1572 break;
1573 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1574 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1575 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1576 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) {
1577 ND_PRINT((ndo, "invalid len"));
1578 tlen = 0;
1579 } else {
1580 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1581 ND_PRINT((ndo, "RD: %s, %s",
1582 bgp_vpn_rd_print(ndo, tptr),
1583 getname(ndo, tptr+BGP_VPN_RD_LEN)));
1584 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1585 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1586 }
1587 break;
1588 #ifdef INET6
1589 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1590 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1591 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1592 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1593 if (tlen < (int)sizeof(struct in6_addr)) {
1594 ND_PRINT((ndo, "invalid len"));
1595 tlen = 0;
1596 } else {
1597 ND_TCHECK2(tptr[0], sizeof(struct in6_addr));
1598 ND_PRINT((ndo, "%s", getname6(ndo, tptr)));
1599 tlen -= sizeof(struct in6_addr);
1600 tptr += sizeof(struct in6_addr);
1601 }
1602 break;
1603 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1604 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1605 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1606 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) {
1607 ND_PRINT((ndo, "invalid len"));
1608 tlen = 0;
1609 } else {
1610 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1611 ND_PRINT((ndo, "RD: %s, %s",
1612 bgp_vpn_rd_print(ndo, tptr),
1613 getname6(ndo, tptr+BGP_VPN_RD_LEN)));
1614 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1615 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1616 }
1617 break;
1618 #endif
1619 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1620 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1621 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1622 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1623 if (tlen < (int)sizeof(struct in_addr)) {
1624 ND_PRINT((ndo, "invalid len"));
1625 tlen = 0;
1626 } else {
1627 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1628 ND_PRINT((ndo, "%s", getname(ndo, tptr)));
1629 tlen -= (sizeof(struct in_addr));
1630 tptr += (sizeof(struct in_addr));
1631 }
1632 break;
1633 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1634 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1635 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1636 ND_TCHECK2(tptr[0], tlen);
1637 ND_PRINT((ndo, "%s", isonsap_string(tptr, tlen)));
1638 tptr += tlen;
1639 tlen = 0;
1640 break;
1641  
1642 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1643 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1644 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1645 if (tlen < BGP_VPN_RD_LEN+1) {
1646 ND_PRINT((ndo, "invalid len"));
1647 tlen = 0;
1648 } else {
1649 ND_TCHECK2(tptr[0], tlen);
1650 ND_PRINT((ndo, "RD: %s, %s",
1651 bgp_vpn_rd_print(ndo, tptr),
1652 isonsap_string(tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1653 /* rfc986 mapped IPv4 address ? */
1654 if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601)
1655 ND_PRINT((ndo, " = %s", getname(ndo, tptr+BGP_VPN_RD_LEN+4)));
1656 #ifdef INET6
1657 /* rfc1888 mapped IPv6 address ? */
1658 else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000)
1659 ND_PRINT((ndo, " = %s", getname6(ndo, tptr+BGP_VPN_RD_LEN+3)));
1660 #endif
1661 tptr += tlen;
1662 tlen = 0;
1663 }
1664 break;
1665 default:
1666 ND_TCHECK2(tptr[0], tlen);
1667 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1668 if (ndo->ndo_vflag <= 1)
1669 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1670 tptr += tlen;
1671 tlen = 0;
1672 goto done;
1673 break;
1674 }
1675 }
1676 }
1677 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1678 tptr += tlen;
1679  
1680 ND_TCHECK(tptr[0]);
1681 snpa = tptr[0];
1682 tptr++;
1683  
1684 if (snpa) {
1685 ND_PRINT((ndo, "\n\t %u SNPA", snpa));
1686 for (/*nothing*/; snpa > 0; snpa--) {
1687 ND_TCHECK(tptr[0]);
1688 ND_PRINT((ndo, "\n\t %d bytes", tptr[0]));
1689 tptr += tptr[0] + 1;
1690 }
1691 } else {
1692 ND_PRINT((ndo, ", no SNPA"));
1693 }
1694  
1695 while (len - (tptr - pptr) > 0) {
1696 switch (af<<8 | safi) {
1697 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1698 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1699 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1700 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1701 if (advance == -1)
1702 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1703 else if (advance == -2)
1704 goto trunc;
1705 else if (advance == -3)
1706 break; /* bytes left, but not enough */
1707 else
1708 ND_PRINT((ndo, "\n\t %s", buf));
1709 break;
1710 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1711 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1712 if (advance == -1)
1713 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1714 else if (advance == -2)
1715 goto trunc;
1716 else if (advance == -3)
1717 break; /* bytes left, but not enough */
1718 else
1719 ND_PRINT((ndo, "\n\t %s", buf));
1720 break;
1721 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1722 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1723 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1724 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1725 if (advance == -1)
1726 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1727 else if (advance == -2)
1728 goto trunc;
1729 else
1730 ND_PRINT((ndo, "\n\t %s", buf));
1731 break;
1732 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1733 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf));
1734 if (advance == -1)
1735 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1736 else if (advance == -2)
1737 goto trunc;
1738 else
1739 ND_PRINT((ndo, "\n\t %s", buf));
1740 break;
1741 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1742 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1743 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1744 if (advance == -1)
1745 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1746 else if (advance == -2)
1747 goto trunc;
1748 else
1749 ND_PRINT((ndo, "\n\t %s", buf));
1750 break;
1751  
1752 case (AFNUM_INET<<8 | SAFNUM_MDT):
1753 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1754 if (advance == -1)
1755 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1756 else if (advance == -2)
1757 goto trunc;
1758 else
1759 ND_PRINT((ndo, "\n\t %s", buf));
1760 break;
1761 #ifdef INET6
1762 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1763 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1764 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1765 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1766 if (advance == -1)
1767 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1768 else if (advance == -2)
1769 goto trunc;
1770 else if (advance == -3)
1771 break; /* bytes left, but not enough */
1772 else
1773 ND_PRINT((ndo, "\n\t %s", buf));
1774 break;
1775 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1776 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1777 if (advance == -1)
1778 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1779 else if (advance == -2)
1780 goto trunc;
1781 else if (advance == -3)
1782 break; /* bytes left, but not enough */
1783 else
1784 ND_PRINT((ndo, "\n\t %s", buf));
1785 break;
1786 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1787 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1788 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1789 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1790 if (advance == -1)
1791 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1792 else if (advance == -2)
1793 goto trunc;
1794 else
1795 ND_PRINT((ndo, "\n\t %s", buf));
1796 break;
1797 #endif
1798 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1799 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1800 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1801 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1802 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1803 if (advance == -1)
1804 ND_PRINT((ndo, "\n\t (illegal length)"));
1805 else if (advance == -2)
1806 goto trunc;
1807 else
1808 ND_PRINT((ndo, "\n\t %s", buf));
1809 break;
1810 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1811 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1812 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1813 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1814 if (advance == -1)
1815 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1816 else if (advance == -2)
1817 goto trunc;
1818 else
1819 ND_PRINT((ndo, "\n\t %s", buf));
1820 break;
1821 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1822 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1823 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1824 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1825 if (advance == -1)
1826 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1827 else if (advance == -2)
1828 goto trunc;
1829 else
1830 ND_PRINT((ndo, "\n\t %s", buf));
1831 break;
1832 default:
1833 ND_TCHECK2(*tptr,tlen);
1834 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1835 if (ndo->ndo_vflag <= 1)
1836 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1837 advance = 0;
1838 tptr = pptr + len;
1839 break;
1840 }
1841 if (advance < 0)
1842 break;
1843 tptr += advance;
1844 }
1845 done:
1846 break;
1847  
1848 case BGPTYPE_MP_UNREACH_NLRI:
1849 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE);
1850 af = EXTRACT_16BITS(tptr);
1851 safi = tptr[2];
1852  
1853 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1854 tok2strbuf(af_values, "Unknown AFI", af,
1855 tokbuf, sizeof(tokbuf)),
1856 af,
1857 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1858 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi,
1859 tokbuf, sizeof(tokbuf)),
1860 safi));
1861  
1862 if (len == BGP_MP_NLRI_MINSIZE)
1863 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
1864  
1865 tptr += 3;
1866  
1867 while (len - (tptr - pptr) > 0) {
1868 switch (af<<8 | safi) {
1869 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1870 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1871 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1872 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1873 if (advance == -1)
1874 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1875 else if (advance == -2)
1876 goto trunc;
1877 else if (advance == -3)
1878 break; /* bytes left, but not enough */
1879 else
1880 ND_PRINT((ndo, "\n\t %s", buf));
1881 break;
1882 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1883 advance = decode_labeled_prefix4(ndo, tptr, len, 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 if (advance == -3)
1889 break; /* bytes left, but not enough */
1890 else
1891 ND_PRINT((ndo, "\n\t %s", buf));
1892 break;
1893 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1894 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1895 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1896 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1897 if (advance == -1)
1898 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1899 else if (advance == -2)
1900 goto trunc;
1901 else
1902 ND_PRINT((ndo, "\n\t %s", buf));
1903 break;
1904 #ifdef INET6
1905 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1906 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1907 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1908 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1909 if (advance == -1)
1910 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1911 else if (advance == -2)
1912 goto trunc;
1913 else if (advance == -3)
1914 break; /* bytes left, but not enough */
1915 else
1916 ND_PRINT((ndo, "\n\t %s", buf));
1917 break;
1918 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1919 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1920 if (advance == -1)
1921 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1922 else if (advance == -2)
1923 goto trunc;
1924 else if (advance == -3)
1925 break; /* bytes left, but not enough */
1926 else
1927 ND_PRINT((ndo, "\n\t %s", buf));
1928 break;
1929 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1930 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1931 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1932 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1933 if (advance == -1)
1934 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1935 else if (advance == -2)
1936 goto trunc;
1937 else
1938 ND_PRINT((ndo, "\n\t %s", buf));
1939 break;
1940 #endif
1941 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1942 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1943 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1944 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1945 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1946 if (advance == -1)
1947 ND_PRINT((ndo, "\n\t (illegal length)"));
1948 else if (advance == -2)
1949 goto trunc;
1950 else
1951 ND_PRINT((ndo, "\n\t %s", buf));
1952 break;
1953 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1954 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1955 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1956 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1957 if (advance == -1)
1958 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1959 else if (advance == -2)
1960 goto trunc;
1961 else
1962 ND_PRINT((ndo, "\n\t %s", buf));
1963 break;
1964 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1965 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1966 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1967 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1968 if (advance == -1)
1969 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1970 else if (advance == -2)
1971 goto trunc;
1972 else
1973 ND_PRINT((ndo, "\n\t %s", buf));
1974 break;
1975 case (AFNUM_INET<<8 | SAFNUM_MDT):
1976 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1977 if (advance == -1)
1978 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1979 else if (advance == -2)
1980 goto trunc;
1981 else
1982 ND_PRINT((ndo, "\n\t %s", buf));
1983 break;
1984 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1985 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1986 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1987 if (advance == -1)
1988 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1989 else if (advance == -2)
1990 goto trunc;
1991 else
1992 ND_PRINT((ndo, "\n\t %s", buf));
1993 break;
1994 default:
1995 ND_TCHECK2(*(tptr-3),tlen);
1996 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
1997 if (ndo->ndo_vflag <= 1)
1998 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
1999 advance = 0;
2000 tptr = pptr + len;
2001 break;
2002 }
2003 if (advance < 0)
2004 break;
2005 tptr += advance;
2006 }
2007 break;
2008 case BGPTYPE_EXTD_COMMUNITIES:
2009 if (len % 8) {
2010 ND_PRINT((ndo, "invalid len"));
2011 break;
2012 }
2013 while (tlen>0) {
2014 uint16_t extd_comm;
2015  
2016 ND_TCHECK2(tptr[0], 2);
2017 extd_comm=EXTRACT_16BITS(tptr);
2018  
2019 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]",
2020 tok2strbuf(bgp_extd_comm_subtype_values,
2021 "unknown extd community typecode",
2022 extd_comm, tokbuf, sizeof(tokbuf)),
2023 extd_comm,
2024 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2025  
2026 ND_TCHECK2(*(tptr+2), 6);
2027 switch(extd_comm) {
2028 case BGP_EXT_COM_RT_0:
2029 case BGP_EXT_COM_RO_0:
2030 case BGP_EXT_COM_L2VPN_RT_0:
2031 ND_PRINT((ndo, ": %u:%u (= %s)",
2032 EXTRACT_16BITS(tptr+2),
2033 EXTRACT_32BITS(tptr+4),
2034 getname(ndo, tptr+4)));
2035 break;
2036 case BGP_EXT_COM_RT_1:
2037 case BGP_EXT_COM_RO_1:
2038 case BGP_EXT_COM_L2VPN_RT_1:
2039 case BGP_EXT_COM_VRF_RT_IMP:
2040 ND_PRINT((ndo, ": %s:%u",
2041 getname(ndo, tptr+2),
2042 EXTRACT_16BITS(tptr+6)));
2043 break;
2044 case BGP_EXT_COM_RT_2:
2045 case BGP_EXT_COM_RO_2:
2046 ND_PRINT((ndo, ": %s:%u",
2047 as_printf(ndo, astostr, sizeof(astostr),
2048 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6)));
2049 break;
2050 case BGP_EXT_COM_LINKBAND:
2051 bw.i = EXTRACT_32BITS(tptr+2);
2052 ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2053 bw.f*8/1000000));
2054 break;
2055 case BGP_EXT_COM_VPN_ORIGIN:
2056 case BGP_EXT_COM_VPN_ORIGIN2:
2057 case BGP_EXT_COM_VPN_ORIGIN3:
2058 case BGP_EXT_COM_VPN_ORIGIN4:
2059 case BGP_EXT_COM_OSPF_RID:
2060 case BGP_EXT_COM_OSPF_RID2:
2061 ND_PRINT((ndo, "%s", getname(ndo, tptr+2)));
2062 break;
2063 case BGP_EXT_COM_OSPF_RTYPE:
2064 case BGP_EXT_COM_OSPF_RTYPE2:
2065 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2066 getname(ndo, tptr+2),
2067 tok2strbuf(bgp_extd_comm_ospf_rtype_values,
2068 "unknown (0x%02x)",
2069 *(tptr+6),
2070 tokbuf, sizeof(tokbuf)),
2071 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2072 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2073 break;
2074 case BGP_EXT_COM_L2INFO:
2075 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2076 tok2strbuf(l2vpn_encaps_values,
2077 "unknown encaps",
2078 *(tptr+2),
2079 tokbuf, sizeof(tokbuf)),
2080 *(tptr+3),
2081 EXTRACT_16BITS(tptr+4)));
2082 break;
2083 case BGP_EXT_COM_SOURCE_AS:
2084 ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2)));
2085 break;
2086 default:
2087 ND_TCHECK2(*tptr,8);
2088 print_unknown_data(ndo, tptr, "\n\t ", 8);
2089 break;
2090 }
2091 tlen -=8;
2092 tptr +=8;
2093 }
2094 break;
2095  
2096 case BGPTYPE_PMSI_TUNNEL:
2097 {
2098 uint8_t tunnel_type, flags;
2099  
2100 tunnel_type = *(tptr+1);
2101 flags = *tptr;
2102 tlen = len;
2103  
2104 ND_TCHECK2(tptr[0], 5);
2105 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2106 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2107 tunnel_type,
2108 bittok2str(bgp_pmsi_flag_values, "none", flags),
2109 EXTRACT_24BITS(tptr+2)>>4));
2110  
2111 tptr +=5;
2112 tlen -= 5;
2113  
2114 switch (tunnel_type) {
2115 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2116 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2117 ND_TCHECK2(tptr[0], 8);
2118 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s",
2119 ipaddr_string(ndo, tptr),
2120 ipaddr_string(ndo, tptr+4)));
2121 break;
2122  
2123 case BGP_PMSI_TUNNEL_PIM_SSM:
2124 ND_TCHECK2(tptr[0], 8);
2125 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s",
2126 ipaddr_string(ndo, tptr),
2127 ipaddr_string(ndo, tptr+4)));
2128 break;
2129 case BGP_PMSI_TUNNEL_INGRESS:
2130 ND_TCHECK2(tptr[0], 4);
2131 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s",
2132 ipaddr_string(ndo, tptr)));
2133 break;
2134 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2135 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2136 ND_TCHECK2(tptr[0], 8);
2137 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x",
2138 ipaddr_string(ndo, tptr),
2139 EXTRACT_32BITS(tptr+4)));
2140 break;
2141 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2142 ND_TCHECK2(tptr[0], 8);
2143 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2144 ipaddr_string(ndo, tptr),
2145 EXTRACT_32BITS(tptr+4)));
2146 break;
2147 default:
2148 if (ndo->ndo_vflag <= 1) {
2149 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2150 }
2151 }
2152 break;
2153 }
2154 case BGPTYPE_ATTR_SET:
2155 ND_TCHECK2(tptr[0], 4);
2156 if (len < 4)
2157 goto trunc;
2158 ND_PRINT((ndo, "\n\t Origin AS: %s",
2159 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr))));
2160 tptr+=4;
2161 len -=4;
2162  
2163 while (len) {
2164 u_int aflags, atype, alenlen, alen;
2165  
2166 ND_TCHECK2(tptr[0], 2);
2167 if (len < 2)
2168 goto trunc;
2169 aflags = *tptr;
2170 atype = *(tptr + 1);
2171 tptr += 2;
2172 len -= 2;
2173 alenlen = bgp_attr_lenlen(aflags, tptr);
2174 ND_TCHECK2(tptr[0], alenlen);
2175 if (len < alenlen)
2176 goto trunc;
2177 alen = bgp_attr_len(aflags, tptr);
2178 tptr += alenlen;
2179 len -= alenlen;
2180  
2181 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2182 tok2strbuf(bgp_attr_values,
2183 "Unknown Attribute", atype,
2184 tokbuf, sizeof(tokbuf)),
2185 atype,
2186 alen));
2187  
2188 if (aflags) {
2189 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2190 aflags & 0x80 ? "O" : "",
2191 aflags & 0x40 ? "T" : "",
2192 aflags & 0x20 ? "P" : "",
2193 aflags & 0x10 ? "E" : ""));
2194 if (aflags & 0xf)
2195 ND_PRINT((ndo, "+%x", aflags & 0xf));
2196 ND_PRINT((ndo, "]: "));
2197 }
2198 /* FIXME check for recursion */
2199 if (!bgp_attr_print(ndo, atype, tptr, alen))
2200 return 0;
2201 tptr += alen;
2202 len -= alen;
2203 }
2204 break;
2205  
2206  
2207 default:
2208 ND_TCHECK2(*pptr,len);
2209 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2210 if (ndo->ndo_vflag <= 1)
2211 print_unknown_data(ndo, pptr, "\n\t ", len);
2212 break;
2213 }
2214 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2215 ND_TCHECK2(*pptr,len);
2216 print_unknown_data(ndo, pptr, "\n\t ", len);
2217 }
2218 return 1;
2219  
2220 trunc:
2221 return 0;
2222 }
2223  
2224 static void
2225 bgp_capabilities_print(netdissect_options *ndo,
2226 const u_char *opt, int caps_len)
2227 {
2228 char tokbuf[TOKBUFSIZE];
2229 char tokbuf2[TOKBUFSIZE];
2230 int cap_type, cap_len, tcap_len, cap_offset;
2231 int i = 0;
2232  
2233 while (i < caps_len) {
2234 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE);
2235 cap_type=opt[i];
2236 cap_len=opt[i+1];
2237 tcap_len=cap_len;
2238 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2239 tok2strbuf(bgp_capcode_values, "Unknown",
2240 cap_type, tokbuf, sizeof(tokbuf)),
2241 cap_type,
2242 cap_len));
2243 ND_TCHECK2(opt[i+2], cap_len);
2244 switch (cap_type) {
2245 case BGP_CAPCODE_MP:
2246 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2247 tok2strbuf(af_values, "Unknown",
2248 EXTRACT_16BITS(opt+i+2),
2249 tokbuf, sizeof(tokbuf)),
2250 EXTRACT_16BITS(opt+i+2),
2251 tok2strbuf(bgp_safi_values, "Unknown",
2252 opt[i+5],
2253 tokbuf, sizeof(tokbuf)),
2254 opt[i+5]));
2255 break;
2256 case BGP_CAPCODE_RESTART:
2257 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2258 ((opt[i+2])&0x80) ? "R" : "none",
2259 EXTRACT_16BITS(opt+i+2)&0xfff));
2260 tcap_len-=2;
2261 cap_offset=4;
2262 while(tcap_len>=4) {
2263 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2264 tok2strbuf(af_values,"Unknown",
2265 EXTRACT_16BITS(opt+i+cap_offset),
2266 tokbuf, sizeof(tokbuf)),
2267 EXTRACT_16BITS(opt+i+cap_offset),
2268 tok2strbuf(bgp_safi_values,"Unknown",
2269 opt[i+cap_offset+2],
2270 tokbuf2, sizeof(tokbuf2)),
2271 opt[i+cap_offset+2],
2272 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" ));
2273 tcap_len-=4;
2274 cap_offset+=4;
2275 }
2276 break;
2277 case BGP_CAPCODE_RR:
2278 case BGP_CAPCODE_RR_CISCO:
2279 break;
2280 case BGP_CAPCODE_AS_NEW:
2281  
2282 /*
2283 * Extract the 4 byte AS number encoded.
2284 */
2285 if (cap_len == 4) {
2286 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2287 as_printf(ndo, astostr, sizeof(astostr),
2288 EXTRACT_32BITS(opt + i + 2))));
2289 }
2290 break;
2291 default:
2292 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2293 cap_type));
2294 if (ndo->ndo_vflag <= 1)
2295 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2296 break;
2297 }
2298 if (ndo->ndo_vflag > 1 && cap_len > 0) {
2299 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2300 }
2301 i += BGP_CAP_HEADER_SIZE + cap_len;
2302 }
2303 return;
2304  
2305 trunc:
2306 ND_PRINT((ndo, "[|BGP]"));
2307 }
2308  
2309 static void
2310 bgp_open_print(netdissect_options *ndo,
2311 const u_char *dat, int length)
2312 {
2313 struct bgp_open bgpo;
2314 struct bgp_opt bgpopt;
2315 const u_char *opt;
2316 int i;
2317 char tokbuf[TOKBUFSIZE];
2318  
2319 ND_TCHECK2(dat[0], BGP_OPEN_SIZE);
2320 memcpy(&bgpo, dat, BGP_OPEN_SIZE);
2321  
2322 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version));
2323 ND_PRINT((ndo, "my AS %s, ",
2324 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas))));
2325 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime)));
2326 ND_PRINT((ndo, "ID %s", getname(ndo, (u_char *)&bgpo.bgpo_id)));
2327 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen));
2328  
2329 /* some little sanity checking */
2330 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE)
2331 return;
2332  
2333 /* ugly! */
2334 opt = &((const struct bgp_open *)dat)->bgpo_optlen;
2335 opt++;
2336  
2337 i = 0;
2338 while (i < bgpo.bgpo_optlen) {
2339 ND_TCHECK2(opt[i], BGP_OPT_SIZE);
2340 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE);
2341 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
2342 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len));
2343 break;
2344 }
2345  
2346 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u",
2347 tok2strbuf(bgp_opt_values,"Unknown",
2348 bgpopt.bgpopt_type,
2349 tokbuf, sizeof(tokbuf)),
2350 bgpopt.bgpopt_type,
2351 bgpopt.bgpopt_len));
2352  
2353 /* now let's decode the options we know*/
2354 switch(bgpopt.bgpopt_type) {
2355  
2356 case BGP_OPT_CAP:
2357 bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE],
2358 bgpopt.bgpopt_len);
2359 break;
2360  
2361 case BGP_OPT_AUTH:
2362 default:
2363 ND_PRINT((ndo, "\n\t no decoder for option %u",
2364 bgpopt.bgpopt_type));
2365 break;
2366 }
2367 i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
2368 }
2369 return;
2370 trunc:
2371 ND_PRINT((ndo, "[|BGP]"));
2372 }
2373  
2374 static void
2375 bgp_update_print(netdissect_options *ndo,
2376 const u_char *dat, int length)
2377 {
2378 struct bgp bgp;
2379 const u_char *p;
2380 int withdrawn_routes_len;
2381 int len;
2382 int i;
2383 char tokbuf[TOKBUFSIZE];
2384 #ifndef INET6
2385 char buf[MAXHOSTNAMELEN + 100];
2386 int wpfx;
2387 #endif
2388  
2389 ND_TCHECK2(dat[0], BGP_SIZE);
2390 if (length < BGP_SIZE)
2391 goto trunc;
2392 memcpy(&bgp, dat, BGP_SIZE);
2393 p = dat + BGP_SIZE; /*XXX*/
2394 length -= BGP_SIZE;
2395  
2396 /* Unfeasible routes */
2397 ND_TCHECK2(p[0], 2);
2398 if (length < 2)
2399 goto trunc;
2400 withdrawn_routes_len = EXTRACT_16BITS(p);
2401 p += 2;
2402 length -= 2;
2403 if (withdrawn_routes_len) {
2404 /*
2405 * Without keeping state from the original NLRI message,
2406 * it's not possible to tell if this a v4 or v6 route,
2407 * so only try to decode it if we're not v6 enabled.
2408 */
2409 ND_TCHECK2(p[0], withdrawn_routes_len);
2410 if (length < withdrawn_routes_len)
2411 goto trunc;
2412 #ifdef INET6
2413 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len));
2414 p += withdrawn_routes_len;
2415 length -= withdrawn_routes_len;
2416 #else
2417 if (withdrawn_routes_len < 2)
2418 goto trunc;
2419 length -= 2;
2420 withdrawn_routes_len -= 2;
2421  
2422  
2423 ND_PRINT((ndo, "\n\t Withdrawn routes:"));
2424  
2425 while(withdrawn_routes_len > 0) {
2426 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
2427 if (wpfx == -1) {
2428 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2429 break;
2430 } else if (wpfx == -2)
2431 goto trunc;
2432 else if (wpfx == -3)
2433 goto trunc; /* bytes left, but not enough */
2434 else {
2435 ND_PRINT((ndo, "\n\t %s", buf));
2436 p += wpfx;
2437 length -= wpfx;
2438 withdrawn_routes_len -= wpfx;
2439 }
2440 }
2441 #endif
2442 }
2443  
2444 ND_TCHECK2(p[0], 2);
2445 if (length < 2)
2446 goto trunc;
2447 len = EXTRACT_16BITS(p);
2448 p += 2;
2449 length -= 2;
2450  
2451 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2452 /* No withdrawn routes, no path attributes, no NLRI */
2453 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2454 return;
2455 }
2456  
2457 if (len) {
2458 /* do something more useful!*/
2459 while (len) {
2460 int aflags, atype, alenlen, alen;
2461  
2462 ND_TCHECK2(p[0], 2);
2463 if (len < 2)
2464 goto trunc;
2465 if (length < 2)
2466 goto trunc;
2467 aflags = *p;
2468 atype = *(p + 1);
2469 p += 2;
2470 len -= 2;
2471 length -= 2;
2472 alenlen = bgp_attr_lenlen(aflags, p);
2473 ND_TCHECK2(p[0], alenlen);
2474 if (len < alenlen)
2475 goto trunc;
2476 if (length < alenlen)
2477 goto trunc;
2478 alen = bgp_attr_len(aflags, p);
2479 p += alenlen;
2480 len -= alenlen;
2481 length -= alenlen;
2482  
2483 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2484 tok2strbuf(bgp_attr_values, "Unknown Attribute",
2485 atype,
2486 tokbuf, sizeof(tokbuf)),
2487 atype,
2488 alen));
2489  
2490 if (aflags) {
2491 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2492 aflags & 0x80 ? "O" : "",
2493 aflags & 0x40 ? "T" : "",
2494 aflags & 0x20 ? "P" : "",
2495 aflags & 0x10 ? "E" : ""));
2496 if (aflags & 0xf)
2497 ND_PRINT((ndo, "+%x", aflags & 0xf));
2498 ND_PRINT((ndo, "]: "));
2499 }
2500 if (len < alen)
2501 goto trunc;
2502 if (length < alen)
2503 goto trunc;
2504 if (!bgp_attr_print(ndo, atype, p, alen))
2505 goto trunc;
2506 p += alen;
2507 len -= alen;
2508 length -= alen;
2509 }
2510 }
2511  
2512 if (length) {
2513 /*
2514 * XXX - what if they're using the "Advertisement of
2515 * Multiple Paths in BGP" feature:
2516 *
2517 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/
2518 *
2519 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06
2520 */
2521 ND_PRINT((ndo, "\n\t Updated routes:"));
2522 while (length) {
2523 char buf[MAXHOSTNAMELEN + 100];
2524 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2525 if (i == -1) {
2526 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2527 break;
2528 } else if (i == -2)
2529 goto trunc;
2530 else if (i == -3)
2531 goto trunc; /* bytes left, but not enough */
2532 else {
2533 ND_PRINT((ndo, "\n\t %s", buf));
2534 p += i;
2535 length -= i;
2536 }
2537 }
2538 }
2539 return;
2540 trunc:
2541 ND_PRINT((ndo, "[|BGP]"));
2542 }
2543  
2544 static void
2545 bgp_notification_print(netdissect_options *ndo,
2546 const u_char *dat, int length)
2547 {
2548 struct bgp_notification bgpn;
2549 const u_char *tptr;
2550 char tokbuf[TOKBUFSIZE];
2551 char tokbuf2[TOKBUFSIZE];
2552  
2553 ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
2554 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
2555  
2556 /* some little sanity checking */
2557 if (length<BGP_NOTIFICATION_SIZE)
2558 return;
2559  
2560 ND_PRINT((ndo, ", %s (%u)",
2561 tok2strbuf(bgp_notify_major_values, "Unknown Error",
2562 bgpn.bgpn_major, tokbuf, sizeof(tokbuf)),
2563 bgpn.bgpn_major));
2564  
2565 switch (bgpn.bgpn_major) {
2566  
2567 case BGP_NOTIFY_MAJOR_MSG:
2568 ND_PRINT((ndo, ", subcode %s (%u)",
2569 tok2strbuf(bgp_notify_minor_msg_values, "Unknown",
2570 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
2571 bgpn.bgpn_minor));
2572 break;
2573 case BGP_NOTIFY_MAJOR_OPEN:
2574 ND_PRINT((ndo, ", subcode %s (%u)",
2575 tok2strbuf(bgp_notify_minor_open_values, "Unknown",
2576 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
2577 bgpn.bgpn_minor));
2578 break;
2579 case BGP_NOTIFY_MAJOR_UPDATE:
2580 ND_PRINT((ndo, ", subcode %s (%u)",
2581 tok2strbuf(bgp_notify_minor_update_values, "Unknown",
2582 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
2583 bgpn.bgpn_minor));
2584 break;
2585 case BGP_NOTIFY_MAJOR_CAP:
2586 ND_PRINT((ndo, " subcode %s (%u)",
2587 tok2strbuf(bgp_notify_minor_cap_values, "Unknown",
2588 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
2589 bgpn.bgpn_minor));
2590 case BGP_NOTIFY_MAJOR_CEASE:
2591 ND_PRINT((ndo, ", subcode %s (%u)",
2592 tok2strbuf(bgp_notify_minor_cease_values, "Unknown",
2593 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
2594 bgpn.bgpn_minor));
2595  
2596 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2597 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2598 */
2599 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2600 tptr = dat + BGP_NOTIFICATION_SIZE;
2601 ND_TCHECK2(*tptr, 7);
2602 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2603 tok2strbuf(af_values, "Unknown",
2604 EXTRACT_16BITS(tptr), tokbuf, sizeof(tokbuf)),
2605 EXTRACT_16BITS(tptr),
2606 tok2strbuf(bgp_safi_values, "Unknown", *(tptr+2),
2607 tokbuf2, sizeof(tokbuf)),
2608 *(tptr+2),
2609 EXTRACT_32BITS(tptr+3)));
2610 }
2611 break;
2612 default:
2613 break;
2614 }
2615  
2616 return;
2617 trunc:
2618 ND_PRINT((ndo, "[|BGP]"));
2619 }
2620  
2621 static void
2622 bgp_route_refresh_print(netdissect_options *ndo,
2623 const u_char *pptr, int len)
2624 {
2625 const struct bgp_route_refresh *bgp_route_refresh_header;
2626 char tokbuf[TOKBUFSIZE];
2627 char tokbuf2[TOKBUFSIZE];
2628  
2629 ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE);
2630  
2631 /* some little sanity checking */
2632 if (len<BGP_ROUTE_REFRESH_SIZE)
2633 return;
2634  
2635 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2636  
2637 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)",
2638 tok2strbuf(af_values,"Unknown",
2639 /* this stinks but the compiler pads the structure
2640 * weird */
2641 EXTRACT_16BITS(&bgp_route_refresh_header->afi),
2642 tokbuf, sizeof(tokbuf)),
2643 EXTRACT_16BITS(&bgp_route_refresh_header->afi),
2644 tok2strbuf(bgp_safi_values,"Unknown",
2645 bgp_route_refresh_header->safi,
2646 tokbuf2, sizeof(tokbuf2)),
2647 bgp_route_refresh_header->safi));
2648  
2649 if (ndo->ndo_vflag > 1) {
2650 ND_TCHECK2(*pptr, len);
2651 print_unknown_data(ndo, pptr, "\n\t ", len);
2652 }
2653  
2654 return;
2655 trunc:
2656 ND_PRINT((ndo, "[|BGP]"));
2657 }
2658  
2659 static int
2660 bgp_header_print(netdissect_options *ndo,
2661 const u_char *dat, int length)
2662 {
2663 struct bgp bgp;
2664 char tokbuf[TOKBUFSIZE];
2665  
2666 ND_TCHECK2(dat[0], BGP_SIZE);
2667 memcpy(&bgp, dat, BGP_SIZE);
2668 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2669 tok2strbuf(bgp_msg_values, "Unknown", bgp.bgp_type,
2670 tokbuf, sizeof(tokbuf)),
2671 bgp.bgp_type,
2672 length));
2673  
2674 switch (bgp.bgp_type) {
2675 case BGP_OPEN:
2676 bgp_open_print(ndo, dat, length);
2677 break;
2678 case BGP_UPDATE:
2679 bgp_update_print(ndo, dat, length);
2680 break;
2681 case BGP_NOTIFICATION:
2682 bgp_notification_print(ndo, dat, length);
2683 break;
2684 case BGP_KEEPALIVE:
2685 break;
2686 case BGP_ROUTE_REFRESH:
2687 bgp_route_refresh_print(ndo, dat, length);
2688 break;
2689 default:
2690 /* we have no decoder for the BGP message */
2691 ND_TCHECK2(*dat, length);
2692 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type));
2693 print_unknown_data(ndo, dat, "\n\t ", length);
2694 break;
2695 }
2696 return 1;
2697 trunc:
2698 ND_PRINT((ndo, "[|BGP]"));
2699 return 0;
2700 }
2701  
2702 void
2703 bgp_print(netdissect_options *ndo,
2704 const u_char *dat, int length)
2705 {
2706 const u_char *p;
2707 const u_char *ep;
2708 const u_char *start;
2709 const u_char marker[] = {
2710 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2711 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2712 };
2713 struct bgp bgp;
2714 uint16_t hlen;
2715 char tokbuf[TOKBUFSIZE];
2716  
2717 ep = dat + length;
2718 if (ndo->ndo_snapend < dat + length)
2719 ep = ndo->ndo_snapend;
2720  
2721 ND_PRINT((ndo, ": BGP"));
2722  
2723 if (ndo->ndo_vflag < 1) /* lets be less chatty */
2724 return;
2725  
2726 p = dat;
2727 start = p;
2728 while (p < ep) {
2729 if (!ND_TTEST2(p[0], 1))
2730 break;
2731 if (p[0] != 0xff) {
2732 p++;
2733 continue;
2734 }
2735  
2736 if (!ND_TTEST2(p[0], sizeof(marker)))
2737 break;
2738 if (memcmp(p, marker, sizeof(marker)) != 0) {
2739 p++;
2740 continue;
2741 }
2742  
2743 /* found BGP header */
2744 ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/
2745 memcpy(&bgp, p, BGP_SIZE);
2746  
2747 if (start != p)
2748 ND_PRINT((ndo, " [|BGP]"));
2749  
2750 hlen = ntohs(bgp.bgp_len);
2751 if (hlen < BGP_SIZE) {
2752 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
2753 BGP_SIZE));
2754 break;
2755 }
2756  
2757 if (ND_TTEST2(p[0], hlen)) {
2758 if (!bgp_header_print(ndo, p, hlen))
2759 return;
2760 p += hlen;
2761 start = p;
2762 } else {
2763 ND_PRINT((ndo, "\n[|BGP %s]",
2764 tok2strbuf(bgp_msg_values,
2765 "Unknown Message Type",
2766 bgp.bgp_type,
2767 tokbuf, sizeof(tokbuf))));
2768 break;
2769 }
2770 }
2771  
2772 return;
2773  
2774 trunc:
2775 ND_PRINT((ndo, " [|BGP]"));
2776 }
2777  
2778 /*
2779 * Local Variables:
2780 * c-style: whitesmith
2781 * c-basic-offset: 4
2782 * End:
2783 */