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Fix the pointer tests in the non-ndoified TTEST2() macro as well.
[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@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 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 /* worst case string is s fully formatted v6 address */
580 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
581 char *pos = addr;
582
583 switch(addr_length) {
584 case (sizeof(struct in_addr) << 3): /* 32 */
585 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
586 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
587 break;
588 #ifdef INET6
589 case (sizeof(struct in6_addr) << 3): /* 128 */
590 ND_TCHECK2(pptr[0], sizeof(struct in6_addr));
591 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
592 break;
593 #endif
594 default:
595 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
596 break;
597 }
598 pos += strlen(pos);
599
600 trunc:
601 *(pos) = '\0';
602 return (addr);
603 }
604
605 /*
606 * bgp_vpn_sg_print
607 *
608 * print an multicast s,g entry into a buffer.
609 * the s,g entry is encoded like this.
610 *
611 * +-----------------------------------+
612 * | Multicast Source Length (1 octet) |
613 * +-----------------------------------+
614 * | Multicast Source (Variable) |
615 * +-----------------------------------+
616 * | Multicast Group Length (1 octet) |
617 * +-----------------------------------+
618 * | Multicast Group (Variable) |
619 * +-----------------------------------+
620 *
621 * return the number of bytes read from the wire.
622 */
623 static int
624 bgp_vpn_sg_print(netdissect_options *ndo,
625 const u_char *pptr, char *buf, u_int buflen) {
626
627 uint8_t addr_length;
628 u_int total_length, offset;
629
630 total_length = 0;
631
632 /* Source address length, encoded in bits */
633 ND_TCHECK2(pptr[0], 1);
634 addr_length = *pptr++;
635
636 /* Source address */
637 ND_TCHECK2(pptr[0], (addr_length >> 3));
638 total_length += (addr_length >> 3) + 1;
639 offset = strlen(buf);
640 if (addr_length) {
641 snprintf(buf + offset, buflen - offset, ", Source %s",
642 bgp_vpn_ip_print(ndo, pptr, addr_length));
643 pptr += (addr_length >> 3);
644 }
645
646 /* Group address length, encoded in bits */
647 ND_TCHECK2(pptr[0], 1);
648 addr_length = *pptr++;
649
650 /* Group address */
651 ND_TCHECK2(pptr[0], (addr_length >> 3));
652 total_length += (addr_length >> 3) + 1;
653 offset = strlen(buf);
654 if (addr_length) {
655 snprintf(buf + offset, buflen - offset, ", Group %s",
656 bgp_vpn_ip_print(ndo, pptr, addr_length));
657 pptr += (addr_length >> 3);
658 }
659
660 trunc:
661 return (total_length);
662 }
663
664
665 /* RDs and RTs share the same semantics
666 * we use bgp_vpn_rd_print for
667 * printing route targets inside a NLRI */
668 char *
669 bgp_vpn_rd_print(netdissect_options *ndo,
670 const u_char *pptr) {
671
672 /* allocate space for the largest possible string */
673 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
674 char *pos = rd;
675
676 /* ok lets load the RD format */
677 switch (EXTRACT_16BITS(pptr)) {
678
679 /* 2-byte-AS:number fmt*/
680 case 0:
681 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
682 EXTRACT_16BITS(pptr+2),
683 EXTRACT_32BITS(pptr+4),
684 *(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7));
685 break;
686 /* IP-address:AS fmt*/
687
688 case 1:
689 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
690 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6));
691 break;
692
693 /* 4-byte-AS:number fmt*/
694 case 2:
695 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
696 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+2)),
697 EXTRACT_16BITS(pptr+6), *(pptr+2), *(pptr+3), *(pptr+4),
698 *(pptr+5), EXTRACT_16BITS(pptr+6));
699 break;
700 default:
701 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
702 break;
703 }
704 pos += strlen(pos);
705 *(pos) = '\0';
706 return (rd);
707 }
708
709 static int
710 decode_rt_routing_info(netdissect_options *ndo,
711 const u_char *pptr, char *buf, u_int buflen)
712 {
713 uint8_t route_target[8];
714 u_int plen;
715
716 ND_TCHECK(pptr[0]);
717 plen = pptr[0]; /* get prefix length */
718
719 if (0 == plen)
720 return 1; /* default route target */
721
722 if (32 > plen)
723 return -1;
724
725 plen-=32; /* adjust prefix length */
726
727 if (64 < plen)
728 return -1;
729
730 memset(&route_target, 0, sizeof(route_target));
731 ND_TCHECK2(pptr[1], (plen + 7) / 8);
732 memcpy(&route_target, &pptr[1], (plen + 7) / 8);
733 if (plen % 8) {
734 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
735 ((0xff00 >> (plen % 8)) & 0xff);
736 }
737 snprintf(buf, buflen, "origin AS: %s, route target %s",
738 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+1)),
739 bgp_vpn_rd_print(ndo, (u_char *)&route_target));
740
741 return 5 + (plen + 7) / 8;
742
743 trunc:
744 return -2;
745 }
746
747 static int
748 decode_labeled_vpn_prefix4(netdissect_options *ndo,
749 const u_char *pptr, char *buf, u_int buflen)
750 {
751 struct in_addr addr;
752 u_int plen;
753
754 ND_TCHECK(pptr[0]);
755 plen = pptr[0]; /* get prefix length */
756
757 if ((24+64) > plen)
758 return -1;
759
760 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
761
762 if (32 < plen)
763 return -1;
764
765 memset(&addr, 0, sizeof(addr));
766 ND_TCHECK2(pptr[12], (plen + 7) / 8);
767 memcpy(&addr, &pptr[12], (plen + 7) / 8);
768 if (plen % 8) {
769 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
770 ((0xff00 >> (plen % 8)) & 0xff);
771 }
772 /* the label may get offsetted by 4 bits so lets shift it right */
773 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
774 bgp_vpn_rd_print(ndo, pptr+4),
775 getname(ndo, (u_char *)&addr),
776 plen,
777 EXTRACT_24BITS(pptr+1)>>4,
778 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
779
780 return 12 + (plen + 7) / 8;
781
782 trunc:
783 return -2;
784 }
785
786 /*
787 * +-------------------------------+
788 * | |
789 * | RD:IPv4-address (12 octets) |
790 * | |
791 * +-------------------------------+
792 * | MDT Group-address (4 octets) |
793 * +-------------------------------+
794 */
795
796 #define MDT_VPN_NLRI_LEN 16
797
798 static int
799 decode_mdt_vpn_nlri(netdissect_options *ndo,
800 const u_char *pptr, char *buf, u_int buflen)
801 {
802
803 const u_char *rd;
804 const u_char *vpn_ip;
805
806 ND_TCHECK(pptr[0]);
807
808 /* if the NLRI is not predefined length, quit.*/
809 if (*pptr != MDT_VPN_NLRI_LEN * 8)
810 return -1;
811 pptr++;
812
813 /* RD */
814 ND_TCHECK2(pptr[0], 8);
815 rd = pptr;
816 pptr+=8;
817
818 /* IPv4 address */
819 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
820 vpn_ip = pptr;
821 pptr+=sizeof(struct in_addr);
822
823 /* MDT Group Address */
824 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
825
826 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
827 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
828
829 return MDT_VPN_NLRI_LEN + 1;
830
831 trunc:
832
833 return -2;
834 }
835
836 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
837 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
838 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
839 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
840 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
841 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
842 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
843
844 static const struct tok bgp_multicast_vpn_route_type_values[] = {
845 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
846 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
847 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
848 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
849 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
850 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
851 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
852 };
853
854 static int
855 decode_multicast_vpn(netdissect_options *ndo,
856 const u_char *pptr, char *buf, u_int buflen)
857 {
858 uint8_t route_type, route_length, addr_length, sg_length;
859 u_int offset;
860
861 ND_TCHECK2(pptr[0], 2);
862 route_type = *pptr++;
863 route_length = *pptr++;
864
865 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
866 tok2str(bgp_multicast_vpn_route_type_values,
867 "Unknown", route_type),
868 route_type, route_length);
869
870 switch(route_type) {
871 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
872 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
873 offset = strlen(buf);
874 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
875 bgp_vpn_rd_print(ndo, pptr),
876 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
877 (route_length - BGP_VPN_RD_LEN) << 3));
878 break;
879 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
880 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4);
881 offset = strlen(buf);
882 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
883 bgp_vpn_rd_print(ndo, pptr),
884 as_printf(ndo, astostr, sizeof(astostr),
885 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
886 break;
887
888 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
889 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
890 offset = strlen(buf);
891 snprintf(buf + offset, buflen - offset, ", RD: %s",
892 bgp_vpn_rd_print(ndo, pptr));
893 pptr += BGP_VPN_RD_LEN;
894
895 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
896 addr_length = route_length - sg_length;
897
898 ND_TCHECK2(pptr[0], addr_length);
899 offset = strlen(buf);
900 snprintf(buf + offset, buflen - offset, ", Originator %s",
901 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
902 break;
903
904 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
905 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
906 offset = strlen(buf);
907 snprintf(buf + offset, buflen - offset, ", RD: %s",
908 bgp_vpn_rd_print(ndo, pptr));
909 pptr += BGP_VPN_RD_LEN;
910
911 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
912 break;
913
914 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
915 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
916 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
917 offset = strlen(buf);
918 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
919 bgp_vpn_rd_print(ndo, pptr),
920 as_printf(ndo, astostr, sizeof(astostr),
921 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
922 pptr += BGP_VPN_RD_LEN;
923
924 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
925 break;
926
927 /*
928 * no per route-type printing yet.
929 */
930 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
931 default:
932 break;
933 }
934
935 return route_length + 2;
936
937 trunc:
938 return -2;
939 }
940
941 /*
942 * As I remember, some versions of systems have an snprintf() that
943 * returns -1 if the buffer would have overflowed. If the return
944 * value is negative, set buflen to 0, to indicate that we've filled
945 * the buffer up.
946 *
947 * If the return value is greater than buflen, that means that
948 * the buffer would have overflowed; again, set buflen to 0 in
949 * that case.
950 */
951 #define UPDATE_BUF_BUFLEN(buf, buflen, strlen) \
952 if (strlen<0) \
953 buflen=0; \
954 else if ((u_int)strlen>buflen) \
955 buflen=0; \
956 else { \
957 buflen-=strlen; \
958 buf+=strlen; \
959 }
960
961 static int
962 decode_labeled_vpn_l2(netdissect_options *ndo,
963 const u_char *pptr, char *buf, u_int buflen)
964 {
965 int plen,tlen,strlen,tlv_type,tlv_len,ttlv_len;
966
967 ND_TCHECK2(pptr[0], 2);
968 plen=EXTRACT_16BITS(pptr);
969 tlen=plen;
970 pptr+=2;
971 /* Old and new L2VPN NLRI share AFI/SAFI
972 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
973 * and > 17 as old format. Complain for the middle case
974 */
975 if (plen==12) {
976 /* assume AD-only with RD, BGPNH */
977 ND_TCHECK2(pptr[0],12);
978 buf[0]='\0';
979 strlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s",
980 bgp_vpn_rd_print(ndo, pptr),
981 /* need something like getname(ndo, ) here */
982 getname(ndo, pptr+8)
983 );
984 UPDATE_BUF_BUFLEN(buf, buflen, strlen);
985 pptr+=12;
986 tlen-=12;
987 return plen;
988 } else if (plen>17) {
989 /* assume old format */
990 /* RD, ID, LBLKOFF, LBLBASE */
991
992 ND_TCHECK2(pptr[0],15);
993 buf[0]='\0';
994 strlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
995 bgp_vpn_rd_print(ndo, pptr),
996 EXTRACT_16BITS(pptr+8),
997 EXTRACT_16BITS(pptr+10),
998 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
999 UPDATE_BUF_BUFLEN(buf, buflen, strlen);
1000 pptr+=15;
1001 tlen-=15;
1002
1003 /* ok now the variable part - lets read out TLVs*/
1004 while (tlen>0) {
1005 if (tlen < 3)
1006 return -1;
1007 ND_TCHECK2(pptr[0], 3);
1008 tlv_type=*pptr++;
1009 tlv_len=EXTRACT_16BITS(pptr);
1010 ttlv_len=tlv_len;
1011 pptr+=2;
1012
1013 switch(tlv_type) {
1014 case 1:
1015 if (buflen!=0) {
1016 strlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1017 tlv_type,
1018 tlv_len);
1019 UPDATE_BUF_BUFLEN(buf, buflen, strlen);
1020 }
1021 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
1022 while (ttlv_len>0) {
1023 ND_TCHECK(pptr[0]);
1024 if (buflen!=0) {
1025 strlen=snprintf(buf,buflen, "%02x",*pptr++);
1026 UPDATE_BUF_BUFLEN(buf, buflen, strlen);
1027 }
1028 ttlv_len--;
1029 }
1030 break;
1031 default:
1032 if (buflen!=0) {
1033 strlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1034 tlv_type,
1035 tlv_len);
1036 UPDATE_BUF_BUFLEN(buf, buflen, strlen);
1037 }
1038 break;
1039 }
1040 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
1041 }
1042 return plen+2;
1043
1044 } else {
1045 /* complain bitterly ? */
1046 /* fall through */
1047 goto trunc;
1048 }
1049
1050 trunc:
1051 return -2;
1052 }
1053
1054 #ifdef INET6
1055 int
1056 decode_prefix6(netdissect_options *ndo,
1057 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1058 {
1059 struct in6_addr addr;
1060 u_int plen, plenbytes;
1061
1062 ND_TCHECK(pd[0]);
1063 ITEMCHECK(1);
1064 plen = pd[0];
1065 if (128 < plen)
1066 return -1;
1067 itemlen -= 1;
1068
1069 memset(&addr, 0, sizeof(addr));
1070 plenbytes = (plen + 7) / 8;
1071 ND_TCHECK2(pd[1], plenbytes);
1072 ITEMCHECK(plenbytes);
1073 memcpy(&addr, &pd[1], plenbytes);
1074 if (plen % 8) {
1075 addr.s6_addr[plenbytes - 1] &=
1076 ((0xff00 >> (plen % 8)) & 0xff);
1077 }
1078 snprintf(buf, buflen, "%s/%d", getname6(ndo, (u_char *)&addr), plen);
1079 return 1 + plenbytes;
1080
1081 trunc:
1082 return -2;
1083
1084 badtlv:
1085 return -3;
1086 }
1087
1088 static int
1089 decode_labeled_prefix6(netdissect_options *ndo,
1090 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1091 {
1092 struct in6_addr addr;
1093 u_int plen, plenbytes;
1094
1095 /* prefix length and label = 4 bytes */
1096 ND_TCHECK2(pptr[0], 4);
1097 ITEMCHECK(4);
1098 plen = pptr[0]; /* get prefix length */
1099
1100 if (24 > plen)
1101 return -1;
1102
1103 plen-=24; /* adjust prefixlen - labellength */
1104
1105 if (128 < plen)
1106 return -1;
1107 itemlen -= 4;
1108
1109 memset(&addr, 0, sizeof(addr));
1110 plenbytes = (plen + 7) / 8;
1111 ND_TCHECK2(pptr[4], plenbytes);
1112 memcpy(&addr, &pptr[4], plenbytes);
1113 if (plen % 8) {
1114 addr.s6_addr[plenbytes - 1] &=
1115 ((0xff00 >> (plen % 8)) & 0xff);
1116 }
1117 /* the label may get offsetted by 4 bits so lets shift it right */
1118 snprintf(buf, buflen, "%s/%d, label:%u %s",
1119 getname6(ndo, (u_char *)&addr),
1120 plen,
1121 EXTRACT_24BITS(pptr+1)>>4,
1122 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1123
1124 return 4 + plenbytes;
1125
1126 trunc:
1127 return -2;
1128
1129 badtlv:
1130 return -3;
1131 }
1132
1133 static int
1134 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1135 const u_char *pptr, char *buf, u_int buflen)
1136 {
1137 struct in6_addr addr;
1138 u_int plen;
1139
1140 ND_TCHECK(pptr[0]);
1141 plen = pptr[0]; /* get prefix length */
1142
1143 if ((24+64) > plen)
1144 return -1;
1145
1146 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1147
1148 if (128 < plen)
1149 return -1;
1150
1151 memset(&addr, 0, sizeof(addr));
1152 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1153 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1154 if (plen % 8) {
1155 addr.s6_addr[(plen + 7) / 8 - 1] &=
1156 ((0xff00 >> (plen % 8)) & 0xff);
1157 }
1158 /* the label may get offsetted by 4 bits so lets shift it right */
1159 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1160 bgp_vpn_rd_print(ndo, pptr+4),
1161 getname6(ndo, (u_char *)&addr),
1162 plen,
1163 EXTRACT_24BITS(pptr+1)>>4,
1164 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1165
1166 return 12 + (plen + 7) / 8;
1167
1168 trunc:
1169 return -2;
1170 }
1171 #endif
1172
1173 static int
1174 decode_clnp_prefix(netdissect_options *ndo,
1175 const u_char *pptr, char *buf, u_int buflen)
1176 {
1177 uint8_t addr[19];
1178 u_int plen;
1179
1180 ND_TCHECK(pptr[0]);
1181 plen = pptr[0]; /* get prefix length */
1182
1183 if (152 < plen)
1184 return -1;
1185
1186 memset(&addr, 0, sizeof(addr));
1187 ND_TCHECK2(pptr[4], (plen + 7) / 8);
1188 memcpy(&addr, &pptr[4], (plen + 7) / 8);
1189 if (plen % 8) {
1190 addr[(plen + 7) / 8 - 1] &=
1191 ((0xff00 >> (plen % 8)) & 0xff);
1192 }
1193 snprintf(buf, buflen, "%s/%d",
1194 isonsap_string(addr,(plen + 7) / 8),
1195 plen);
1196
1197 return 1 + (plen + 7) / 8;
1198
1199 trunc:
1200 return -2;
1201 }
1202
1203 static int
1204 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1205 const u_char *pptr, char *buf, u_int buflen)
1206 {
1207 uint8_t addr[19];
1208 u_int plen;
1209
1210 ND_TCHECK(pptr[0]);
1211 plen = pptr[0]; /* get prefix length */
1212
1213 if ((24+64) > plen)
1214 return -1;
1215
1216 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1217
1218 if (152 < plen)
1219 return -1;
1220
1221 memset(&addr, 0, sizeof(addr));
1222 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1223 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1224 if (plen % 8) {
1225 addr[(plen + 7) / 8 - 1] &=
1226 ((0xff00 >> (plen % 8)) & 0xff);
1227 }
1228 /* the label may get offsetted by 4 bits so lets shift it right */
1229 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1230 bgp_vpn_rd_print(ndo, pptr+4),
1231 isonsap_string(addr,(plen + 7) / 8),
1232 plen,
1233 EXTRACT_24BITS(pptr+1)>>4,
1234 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1235
1236 return 12 + (plen + 7) / 8;
1237
1238 trunc:
1239 return -2;
1240 }
1241
1242 /*
1243 * bgp_attr_get_as_size
1244 *
1245 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1246 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1247 * support, exchange AS-Path with the same path-attribute type value 0x02.
1248 */
1249 static int
1250 bgp_attr_get_as_size(netdissect_options *ndo,
1251 uint8_t bgpa_type, const u_char *pptr, int len)
1252 {
1253 const u_char *tptr = pptr;
1254
1255 /*
1256 * If the path attribute is the optional AS4 path type, then we already
1257 * know, that ASs must be encoded in 4 byte format.
1258 */
1259 if (bgpa_type == BGPTYPE_AS4_PATH) {
1260 return 4;
1261 }
1262
1263 /*
1264 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1265 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1266 * each.
1267 */
1268 while (tptr < pptr + len) {
1269 ND_TCHECK(tptr[0]);
1270
1271 /*
1272 * If we do not find a valid segment type, our guess might be wrong.
1273 */
1274 if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) {
1275 goto trunc;
1276 }
1277 ND_TCHECK(tptr[1]);
1278 tptr += 2 + tptr[1] * 2;
1279 }
1280
1281 /*
1282 * If we correctly reached end of the AS path attribute data content,
1283 * then most likely ASs were indeed encoded as 2 bytes.
1284 */
1285 if (tptr == pptr + len) {
1286 return 2;
1287 }
1288
1289 trunc:
1290
1291 /*
1292 * We can come here, either we did not have enough data, or if we
1293 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1294 * so that calller can try to decode each AS as of 4 bytes. If indeed
1295 * there was not enough data, it will crib and end the parse anyways.
1296 */
1297 return 4;
1298 }
1299
1300 static int
1301 bgp_attr_print(netdissect_options *ndo,
1302 u_int atype, const u_char *pptr, u_int len)
1303 {
1304 int i;
1305 uint16_t af;
1306 uint8_t safi, snpa, nhlen;
1307 union { /* copy buffer for bandwidth values */
1308 float f;
1309 uint32_t i;
1310 } bw;
1311 int advance;
1312 u_int tlen;
1313 const u_char *tptr;
1314 char buf[MAXHOSTNAMELEN + 100];
1315 char tokbuf[TOKBUFSIZE];
1316 int as_size;
1317
1318 tptr = pptr;
1319 tlen=len;
1320
1321 switch (atype) {
1322 case BGPTYPE_ORIGIN:
1323 if (len != 1)
1324 ND_PRINT((ndo, "invalid len"));
1325 else {
1326 ND_TCHECK(*tptr);
1327 ND_PRINT((ndo, "%s", tok2strbuf(bgp_origin_values,
1328 "Unknown Origin Typecode",
1329 tptr[0],
1330 tokbuf, sizeof(tokbuf))));
1331 }
1332 break;
1333
1334
1335 /*
1336 * Process AS4 byte path and AS2 byte path attributes here.
1337 */
1338 case BGPTYPE_AS4_PATH:
1339 case BGPTYPE_AS_PATH:
1340 if (len % 2) {
1341 ND_PRINT((ndo, "invalid len"));
1342 break;
1343 }
1344 if (!len) {
1345 ND_PRINT((ndo, "empty"));
1346 break;
1347 }
1348
1349 /*
1350 * BGP updates exchanged between New speakers that support 4
1351 * byte AS, ASs are always encoded in 4 bytes. There is no
1352 * definitive way to find this, just by the packet's
1353 * contents. So, check for packet's TLV's sanity assuming
1354 * 2 bytes first, and it does not pass, assume that ASs are
1355 * encoded in 4 bytes format and move on.
1356 */
1357 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1358
1359 while (tptr < pptr + len) {
1360 ND_TCHECK(tptr[0]);
1361 ND_PRINT((ndo, "%s", tok2strbuf(bgp_as_path_segment_open_values,
1362 "?", tptr[0],
1363 tokbuf, sizeof(tokbuf))));
1364 for (i = 0; i < tptr[1] * as_size; i += as_size) {
1365 ND_TCHECK2(tptr[2 + i], as_size);
1366 ND_PRINT((ndo, "%s ",
1367 as_printf(ndo, astostr, sizeof(astostr),
1368 as_size == 2 ?
1369 EXTRACT_16BITS(&tptr[2 + i]) :
1370 EXTRACT_32BITS(&tptr[2 + i]))));
1371 }
1372 ND_TCHECK(tptr[0]);
1373 ND_PRINT((ndo, "%s", tok2strbuf(bgp_as_path_segment_close_values,
1374 "?", tptr[0],
1375 tokbuf, sizeof(tokbuf))));
1376 ND_TCHECK(tptr[1]);
1377 tptr += 2 + tptr[1] * as_size;
1378 }
1379 break;
1380 case BGPTYPE_NEXT_HOP:
1381 if (len != 4)
1382 ND_PRINT((ndo, "invalid len"));
1383 else {
1384 ND_TCHECK2(tptr[0], 4);
1385 ND_PRINT((ndo, "%s", getname(ndo, tptr)));
1386 }
1387 break;
1388 case BGPTYPE_MULTI_EXIT_DISC:
1389 case BGPTYPE_LOCAL_PREF:
1390 if (len != 4)
1391 ND_PRINT((ndo, "invalid len"));
1392 else {
1393 ND_TCHECK2(tptr[0], 4);
1394 ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr)));
1395 }
1396 break;
1397 case BGPTYPE_ATOMIC_AGGREGATE:
1398 if (len != 0)
1399 ND_PRINT((ndo, "invalid len"));
1400 break;
1401 case BGPTYPE_AGGREGATOR:
1402
1403 /*
1404 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1405 * the length of this PA can be either 6 bytes or 8 bytes.
1406 */
1407 if (len != 6 && len != 8) {
1408 ND_PRINT((ndo, "invalid len"));
1409 break;
1410 }
1411 ND_TCHECK2(tptr[0], len);
1412 if (len == 6) {
1413 ND_PRINT((ndo, " AS #%s, origin %s",
1414 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)),
1415 getname(ndo, tptr + 2)));
1416 } else {
1417 ND_PRINT((ndo, " AS #%s, origin %s",
1418 as_printf(ndo, astostr, sizeof(astostr),
1419 EXTRACT_32BITS(tptr)), getname(ndo, tptr + 4)));
1420 }
1421 break;
1422 case BGPTYPE_AGGREGATOR4:
1423 if (len != 8) {
1424 ND_PRINT((ndo, "invalid len"));
1425 break;
1426 }
1427 ND_TCHECK2(tptr[0], 8);
1428 ND_PRINT((ndo, " AS #%s, origin %s",
1429 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)),
1430 getname(ndo, tptr + 4)));
1431 break;
1432 case BGPTYPE_COMMUNITIES:
1433 if (len % 4) {
1434 ND_PRINT((ndo, "invalid len"));
1435 break;
1436 }
1437 while (tlen>0) {
1438 uint32_t comm;
1439 ND_TCHECK2(tptr[0], 4);
1440 comm = EXTRACT_32BITS(tptr);
1441 switch (comm) {
1442 case BGP_COMMUNITY_NO_EXPORT:
1443 ND_PRINT((ndo, " NO_EXPORT"));
1444 break;
1445 case BGP_COMMUNITY_NO_ADVERT:
1446 ND_PRINT((ndo, " NO_ADVERTISE"));
1447 break;
1448 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1449 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1450 break;
1451 default:
1452 ND_PRINT((ndo, "%u:%u%s",
1453 (comm >> 16) & 0xffff,
1454 comm & 0xffff,
1455 (tlen>4) ? ", " : ""));
1456 break;
1457 }
1458 tlen -=4;
1459 tptr +=4;
1460 }
1461 break;
1462 case BGPTYPE_ORIGINATOR_ID:
1463 if (len != 4) {
1464 ND_PRINT((ndo, "invalid len"));
1465 break;
1466 }
1467 ND_TCHECK2(tptr[0], 4);
1468 ND_PRINT((ndo, "%s",getname(ndo, tptr)));
1469 break;
1470 case BGPTYPE_CLUSTER_LIST:
1471 if (len % 4) {
1472 ND_PRINT((ndo, "invalid len"));
1473 break;
1474 }
1475 while (tlen>0) {
1476 ND_TCHECK2(tptr[0], 4);
1477 ND_PRINT((ndo, "%s%s",
1478 getname(ndo, tptr),
1479 (tlen>4) ? ", " : ""));
1480 tlen -=4;
1481 tptr +=4;
1482 }
1483 break;
1484 case BGPTYPE_MP_REACH_NLRI:
1485 ND_TCHECK2(tptr[0], 3);
1486 af = EXTRACT_16BITS(tptr);
1487 safi = tptr[2];
1488
1489 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1490 tok2strbuf(af_values, "Unknown AFI", af,
1491 tokbuf, sizeof(tokbuf)),
1492 af,
1493 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1494 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi,
1495 tokbuf, sizeof(tokbuf)),
1496 safi));
1497
1498 switch(af<<8 | safi) {
1499 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1500 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1501 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1502 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1503 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1504 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1505 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1506 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1507 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1508 case (AFNUM_INET<<8 | SAFNUM_MDT):
1509 #ifdef INET6
1510 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1511 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1512 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1513 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1514 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1515 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1516 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1517 #endif
1518 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1519 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1520 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1521 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1522 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1523 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1524 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1525 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1526 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1527 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1528 break;
1529 default:
1530 ND_TCHECK2(tptr[0], tlen);
1531 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1532 if (ndo->ndo_vflag <= 1)
1533 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1534 goto done;
1535 break;
1536 }
1537
1538 tptr +=3;
1539
1540 ND_TCHECK(tptr[0]);
1541 nhlen = tptr[0];
1542 tlen = nhlen;
1543 tptr++;
1544
1545 if (tlen) {
1546 int nnh = 0;
1547 ND_PRINT((ndo, "\n\t nexthop: "));
1548 while (tlen > 0) {
1549 if ( nnh++ > 0 ) {
1550 ND_PRINT((ndo, ", " ));
1551 }
1552 switch(af<<8 | safi) {
1553 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1554 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1555 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1556 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1557 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1558 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1559 case (AFNUM_INET<<8 | SAFNUM_MDT):
1560 if (tlen < (int)sizeof(struct in_addr)) {
1561 ND_PRINT((ndo, "invalid len"));
1562 tlen = 0;
1563 } else {
1564 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1565 ND_PRINT((ndo, "%s",getname(ndo, tptr)));
1566 tlen -= sizeof(struct in_addr);
1567 tptr += sizeof(struct in_addr);
1568 }
1569 break;
1570 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1571 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1572 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1573 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) {
1574 ND_PRINT((ndo, "invalid len"));
1575 tlen = 0;
1576 } else {
1577 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1578 ND_PRINT((ndo, "RD: %s, %s",
1579 bgp_vpn_rd_print(ndo, tptr),
1580 getname(ndo, tptr+BGP_VPN_RD_LEN)));
1581 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1582 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1583 }
1584 break;
1585 #ifdef INET6
1586 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1587 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1588 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1589 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1590 if (tlen < (int)sizeof(struct in6_addr)) {
1591 ND_PRINT((ndo, "invalid len"));
1592 tlen = 0;
1593 } else {
1594 ND_TCHECK2(tptr[0], sizeof(struct in6_addr));
1595 ND_PRINT((ndo, "%s", getname6(ndo, tptr)));
1596 tlen -= sizeof(struct in6_addr);
1597 tptr += sizeof(struct in6_addr);
1598 }
1599 break;
1600 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1601 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1602 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1603 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) {
1604 ND_PRINT((ndo, "invalid len"));
1605 tlen = 0;
1606 } else {
1607 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1608 ND_PRINT((ndo, "RD: %s, %s",
1609 bgp_vpn_rd_print(ndo, tptr),
1610 getname6(ndo, tptr+BGP_VPN_RD_LEN)));
1611 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1612 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1613 }
1614 break;
1615 #endif
1616 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1617 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1618 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1619 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1620 if (tlen < (int)sizeof(struct in_addr)) {
1621 ND_PRINT((ndo, "invalid len"));
1622 tlen = 0;
1623 } else {
1624 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1625 ND_PRINT((ndo, "%s", getname(ndo, tptr)));
1626 tlen -= (sizeof(struct in_addr));
1627 tptr += (sizeof(struct in_addr));
1628 }
1629 break;
1630 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1631 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1632 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1633 ND_TCHECK2(tptr[0], tlen);
1634 ND_PRINT((ndo, "%s", isonsap_string(tptr, tlen)));
1635 tptr += tlen;
1636 tlen = 0;
1637 break;
1638
1639 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1640 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1641 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1642 if (tlen < BGP_VPN_RD_LEN+1) {
1643 ND_PRINT((ndo, "invalid len"));
1644 tlen = 0;
1645 } else {
1646 ND_TCHECK2(tptr[0], tlen);
1647 ND_PRINT((ndo, "RD: %s, %s",
1648 bgp_vpn_rd_print(ndo, tptr),
1649 isonsap_string(tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1650 /* rfc986 mapped IPv4 address ? */
1651 if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601)
1652 ND_PRINT((ndo, " = %s", getname(ndo, tptr+BGP_VPN_RD_LEN+4)));
1653 #ifdef INET6
1654 /* rfc1888 mapped IPv6 address ? */
1655 else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000)
1656 ND_PRINT((ndo, " = %s", getname6(ndo, tptr+BGP_VPN_RD_LEN+3)));
1657 #endif
1658 tptr += tlen;
1659 tlen = 0;
1660 }
1661 break;
1662 default:
1663 ND_TCHECK2(tptr[0], tlen);
1664 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1665 if (ndo->ndo_vflag <= 1)
1666 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1667 tptr += tlen;
1668 tlen = 0;
1669 goto done;
1670 break;
1671 }
1672 }
1673 }
1674 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1675 tptr += tlen;
1676
1677 ND_TCHECK(tptr[0]);
1678 snpa = tptr[0];
1679 tptr++;
1680
1681 if (snpa) {
1682 ND_PRINT((ndo, "\n\t %u SNPA", snpa));
1683 for (/*nothing*/; snpa > 0; snpa--) {
1684 ND_TCHECK(tptr[0]);
1685 ND_PRINT((ndo, "\n\t %d bytes", tptr[0]));
1686 tptr += tptr[0] + 1;
1687 }
1688 } else {
1689 ND_PRINT((ndo, ", no SNPA"));
1690 }
1691
1692 while (len - (tptr - pptr) > 0) {
1693 switch (af<<8 | safi) {
1694 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1695 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1696 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1697 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1698 if (advance == -1)
1699 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1700 else if (advance == -2)
1701 goto trunc;
1702 else if (advance == -3)
1703 break; /* bytes left, but not enough */
1704 else
1705 ND_PRINT((ndo, "\n\t %s", buf));
1706 break;
1707 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1708 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1709 if (advance == -1)
1710 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1711 else if (advance == -2)
1712 goto trunc;
1713 else if (advance == -3)
1714 break; /* bytes left, but not enough */
1715 else
1716 ND_PRINT((ndo, "\n\t %s", buf));
1717 break;
1718 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1719 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1720 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1721 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1722 if (advance == -1)
1723 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1724 else if (advance == -2)
1725 goto trunc;
1726 else
1727 ND_PRINT((ndo, "\n\t %s", buf));
1728 break;
1729 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1730 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf));
1731 if (advance == -1)
1732 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1733 else if (advance == -2)
1734 goto trunc;
1735 else
1736 ND_PRINT((ndo, "\n\t %s", buf));
1737 break;
1738 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1739 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1740 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1741 if (advance == -1)
1742 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1743 else if (advance == -2)
1744 goto trunc;
1745 else
1746 ND_PRINT((ndo, "\n\t %s", buf));
1747 break;
1748
1749 case (AFNUM_INET<<8 | SAFNUM_MDT):
1750 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1751 if (advance == -1)
1752 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1753 else if (advance == -2)
1754 goto trunc;
1755 else
1756 ND_PRINT((ndo, "\n\t %s", buf));
1757 break;
1758 #ifdef INET6
1759 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1760 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1761 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1762 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1763 if (advance == -1)
1764 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1765 else if (advance == -2)
1766 goto trunc;
1767 else if (advance == -3)
1768 break; /* bytes left, but not enough */
1769 else
1770 ND_PRINT((ndo, "\n\t %s", buf));
1771 break;
1772 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1773 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1774 if (advance == -1)
1775 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1776 else if (advance == -2)
1777 goto trunc;
1778 else if (advance == -3)
1779 break; /* bytes left, but not enough */
1780 else
1781 ND_PRINT((ndo, "\n\t %s", buf));
1782 break;
1783 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1784 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1785 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1786 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1787 if (advance == -1)
1788 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1789 else if (advance == -2)
1790 goto trunc;
1791 else
1792 ND_PRINT((ndo, "\n\t %s", buf));
1793 break;
1794 #endif
1795 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1796 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1797 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1798 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1799 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1800 if (advance == -1)
1801 ND_PRINT((ndo, "\n\t (illegal length)"));
1802 else if (advance == -2)
1803 goto trunc;
1804 else
1805 ND_PRINT((ndo, "\n\t %s", buf));
1806 break;
1807 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1808 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1809 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1810 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1811 if (advance == -1)
1812 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1813 else if (advance == -2)
1814 goto trunc;
1815 else
1816 ND_PRINT((ndo, "\n\t %s", buf));
1817 break;
1818 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1819 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1820 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1821 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1822 if (advance == -1)
1823 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1824 else if (advance == -2)
1825 goto trunc;
1826 else
1827 ND_PRINT((ndo, "\n\t %s", buf));
1828 break;
1829 default:
1830 ND_TCHECK2(*tptr,tlen);
1831 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1832 if (ndo->ndo_vflag <= 1)
1833 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1834 advance = 0;
1835 tptr = pptr + len;
1836 break;
1837 }
1838 if (advance < 0)
1839 break;
1840 tptr += advance;
1841 }
1842 done:
1843 break;
1844
1845 case BGPTYPE_MP_UNREACH_NLRI:
1846 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE);
1847 af = EXTRACT_16BITS(tptr);
1848 safi = tptr[2];
1849
1850 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1851 tok2strbuf(af_values, "Unknown AFI", af,
1852 tokbuf, sizeof(tokbuf)),
1853 af,
1854 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1855 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi,
1856 tokbuf, sizeof(tokbuf)),
1857 safi));
1858
1859 if (len == BGP_MP_NLRI_MINSIZE)
1860 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
1861
1862 tptr += 3;
1863
1864 while (len - (tptr - pptr) > 0) {
1865 switch (af<<8 | safi) {
1866 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1867 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1868 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1869 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1870 if (advance == -1)
1871 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1872 else if (advance == -2)
1873 goto trunc;
1874 else if (advance == -3)
1875 break; /* bytes left, but not enough */
1876 else
1877 ND_PRINT((ndo, "\n\t %s", buf));
1878 break;
1879 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1880 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1881 if (advance == -1)
1882 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1883 else if (advance == -2)
1884 goto trunc;
1885 else if (advance == -3)
1886 break; /* bytes left, but not enough */
1887 else
1888 ND_PRINT((ndo, "\n\t %s", buf));
1889 break;
1890 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1891 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1892 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1893 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1894 if (advance == -1)
1895 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1896 else if (advance == -2)
1897 goto trunc;
1898 else
1899 ND_PRINT((ndo, "\n\t %s", buf));
1900 break;
1901 #ifdef INET6
1902 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1903 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1904 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1905 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1906 if (advance == -1)
1907 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1908 else if (advance == -2)
1909 goto trunc;
1910 else if (advance == -3)
1911 break; /* bytes left, but not enough */
1912 else
1913 ND_PRINT((ndo, "\n\t %s", buf));
1914 break;
1915 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1916 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1917 if (advance == -1)
1918 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1919 else if (advance == -2)
1920 goto trunc;
1921 else if (advance == -3)
1922 break; /* bytes left, but not enough */
1923 else
1924 ND_PRINT((ndo, "\n\t %s", buf));
1925 break;
1926 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1927 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1928 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1929 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1930 if (advance == -1)
1931 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1932 else if (advance == -2)
1933 goto trunc;
1934 else
1935 ND_PRINT((ndo, "\n\t %s", buf));
1936 break;
1937 #endif
1938 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1939 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1940 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1941 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1942 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1943 if (advance == -1)
1944 ND_PRINT((ndo, "\n\t (illegal length)"));
1945 else if (advance == -2)
1946 goto trunc;
1947 else
1948 ND_PRINT((ndo, "\n\t %s", buf));
1949 break;
1950 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1951 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1952 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1953 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1954 if (advance == -1)
1955 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1956 else if (advance == -2)
1957 goto trunc;
1958 else
1959 ND_PRINT((ndo, "\n\t %s", buf));
1960 break;
1961 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1962 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1963 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1964 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1965 if (advance == -1)
1966 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1967 else if (advance == -2)
1968 goto trunc;
1969 else
1970 ND_PRINT((ndo, "\n\t %s", buf));
1971 break;
1972 case (AFNUM_INET<<8 | SAFNUM_MDT):
1973 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1974 if (advance == -1)
1975 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1976 else if (advance == -2)
1977 goto trunc;
1978 else
1979 ND_PRINT((ndo, "\n\t %s", buf));
1980 break;
1981 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1982 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1983 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1984 if (advance == -1)
1985 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1986 else if (advance == -2)
1987 goto trunc;
1988 else
1989 ND_PRINT((ndo, "\n\t %s", buf));
1990 break;
1991 default:
1992 ND_TCHECK2(*(tptr-3),tlen);
1993 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
1994 if (ndo->ndo_vflag <= 1)
1995 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
1996 advance = 0;
1997 tptr = pptr + len;
1998 break;
1999 }
2000 if (advance < 0)
2001 break;
2002 tptr += advance;
2003 }
2004 break;
2005 case BGPTYPE_EXTD_COMMUNITIES:
2006 if (len % 8) {
2007 ND_PRINT((ndo, "invalid len"));
2008 break;
2009 }
2010 while (tlen>0) {
2011 uint16_t extd_comm;
2012
2013 ND_TCHECK2(tptr[0], 2);
2014 extd_comm=EXTRACT_16BITS(tptr);
2015
2016 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]",
2017 tok2strbuf(bgp_extd_comm_subtype_values,
2018 "unknown extd community typecode",
2019 extd_comm, tokbuf, sizeof(tokbuf)),
2020 extd_comm,
2021 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2022
2023 ND_TCHECK2(*(tptr+2), 6);
2024 switch(extd_comm) {
2025 case BGP_EXT_COM_RT_0:
2026 case BGP_EXT_COM_RO_0:
2027 case BGP_EXT_COM_L2VPN_RT_0:
2028 ND_PRINT((ndo, ": %u:%u (= %s)",
2029 EXTRACT_16BITS(tptr+2),
2030 EXTRACT_32BITS(tptr+4),
2031 getname(ndo, tptr+4)));
2032 break;
2033 case BGP_EXT_COM_RT_1:
2034 case BGP_EXT_COM_RO_1:
2035 case BGP_EXT_COM_L2VPN_RT_1:
2036 case BGP_EXT_COM_VRF_RT_IMP:
2037 ND_PRINT((ndo, ": %s:%u",
2038 getname(ndo, tptr+2),
2039 EXTRACT_16BITS(tptr+6)));
2040 break;
2041 case BGP_EXT_COM_RT_2:
2042 case BGP_EXT_COM_RO_2:
2043 ND_PRINT((ndo, ": %s:%u",
2044 as_printf(ndo, astostr, sizeof(astostr),
2045 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6)));
2046 break;
2047 case BGP_EXT_COM_LINKBAND:
2048 bw.i = EXTRACT_32BITS(tptr+2);
2049 ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2050 bw.f*8/1000000));
2051 break;
2052 case BGP_EXT_COM_VPN_ORIGIN:
2053 case BGP_EXT_COM_VPN_ORIGIN2:
2054 case BGP_EXT_COM_VPN_ORIGIN3:
2055 case BGP_EXT_COM_VPN_ORIGIN4:
2056 case BGP_EXT_COM_OSPF_RID:
2057 case BGP_EXT_COM_OSPF_RID2:
2058 ND_PRINT((ndo, "%s", getname(ndo, tptr+2)));
2059 break;
2060 case BGP_EXT_COM_OSPF_RTYPE:
2061 case BGP_EXT_COM_OSPF_RTYPE2:
2062 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2063 getname(ndo, tptr+2),
2064 tok2strbuf(bgp_extd_comm_ospf_rtype_values,
2065 "unknown (0x%02x)",
2066 *(tptr+6),
2067 tokbuf, sizeof(tokbuf)),
2068 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2069 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2070 break;
2071 case BGP_EXT_COM_L2INFO:
2072 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2073 tok2strbuf(l2vpn_encaps_values,
2074 "unknown encaps",
2075 *(tptr+2),
2076 tokbuf, sizeof(tokbuf)),
2077 *(tptr+3),
2078 EXTRACT_16BITS(tptr+4)));
2079 break;
2080 case BGP_EXT_COM_SOURCE_AS:
2081 ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2)));
2082 break;
2083 default:
2084 ND_TCHECK2(*tptr,8);
2085 print_unknown_data(ndo, tptr, "\n\t ", 8);
2086 break;
2087 }
2088 tlen -=8;
2089 tptr +=8;
2090 }
2091 break;
2092
2093 case BGPTYPE_PMSI_TUNNEL:
2094 {
2095 uint8_t tunnel_type, flags;
2096
2097 tunnel_type = *(tptr+1);
2098 flags = *tptr;
2099 tlen = len;
2100
2101 ND_TCHECK2(tptr[0], 5);
2102 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2103 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2104 tunnel_type,
2105 bittok2str(bgp_pmsi_flag_values, "none", flags),
2106 EXTRACT_24BITS(tptr+2)>>4));
2107
2108 tptr +=5;
2109 tlen -= 5;
2110
2111 switch (tunnel_type) {
2112 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2113 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2114 ND_TCHECK2(tptr[0], 8);
2115 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s",
2116 ipaddr_string(ndo, tptr),
2117 ipaddr_string(ndo, tptr+4)));
2118 break;
2119
2120 case BGP_PMSI_TUNNEL_PIM_SSM:
2121 ND_TCHECK2(tptr[0], 8);
2122 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s",
2123 ipaddr_string(ndo, tptr),
2124 ipaddr_string(ndo, tptr+4)));
2125 break;
2126 case BGP_PMSI_TUNNEL_INGRESS:
2127 ND_TCHECK2(tptr[0], 4);
2128 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s",
2129 ipaddr_string(ndo, tptr)));
2130 break;
2131 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2132 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2133 ND_TCHECK2(tptr[0], 8);
2134 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x",
2135 ipaddr_string(ndo, tptr),
2136 EXTRACT_32BITS(tptr+4)));
2137 break;
2138 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2139 ND_TCHECK2(tptr[0], 8);
2140 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2141 ipaddr_string(ndo, tptr),
2142 EXTRACT_32BITS(tptr+4)));
2143 break;
2144 default:
2145 if (ndo->ndo_vflag <= 1) {
2146 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2147 }
2148 }
2149 break;
2150 }
2151 case BGPTYPE_ATTR_SET:
2152 ND_TCHECK2(tptr[0], 4);
2153 if (len < 4)
2154 goto trunc;
2155 ND_PRINT((ndo, "\n\t Origin AS: %s",
2156 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr))));
2157 tptr+=4;
2158 len -=4;
2159
2160 while (len) {
2161 u_int aflags, atype, alenlen, alen;
2162
2163 ND_TCHECK2(tptr[0], 2);
2164 if (len < 2)
2165 goto trunc;
2166 aflags = *tptr;
2167 atype = *(tptr + 1);
2168 tptr += 2;
2169 len -= 2;
2170 alenlen = bgp_attr_lenlen(aflags, tptr);
2171 ND_TCHECK2(tptr[0], alenlen);
2172 if (len < alenlen)
2173 goto trunc;
2174 alen = bgp_attr_len(aflags, tptr);
2175 tptr += alenlen;
2176 len -= alenlen;
2177
2178 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2179 tok2strbuf(bgp_attr_values,
2180 "Unknown Attribute", atype,
2181 tokbuf, sizeof(tokbuf)),
2182 atype,
2183 alen));
2184
2185 if (aflags) {
2186 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2187 aflags & 0x80 ? "O" : "",
2188 aflags & 0x40 ? "T" : "",
2189 aflags & 0x20 ? "P" : "",
2190 aflags & 0x10 ? "E" : ""));
2191 if (aflags & 0xf)
2192 ND_PRINT((ndo, "+%x", aflags & 0xf));
2193 ND_PRINT((ndo, "]: "));
2194 }
2195 /* FIXME check for recursion */
2196 if (!bgp_attr_print(ndo, atype, tptr, alen))
2197 return 0;
2198 tptr += alen;
2199 len -= alen;
2200 }
2201 break;
2202
2203
2204 default:
2205 ND_TCHECK2(*pptr,len);
2206 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2207 if (ndo->ndo_vflag <= 1)
2208 print_unknown_data(ndo, pptr, "\n\t ", len);
2209 break;
2210 }
2211 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2212 ND_TCHECK2(*pptr,len);
2213 print_unknown_data(ndo, pptr, "\n\t ", len);
2214 }
2215 return 1;
2216
2217 trunc:
2218 return 0;
2219 }
2220
2221 static void
2222 bgp_capabilities_print(netdissect_options *ndo,
2223 const u_char *opt, int caps_len)
2224 {
2225 char tokbuf[TOKBUFSIZE];
2226 char tokbuf2[TOKBUFSIZE];
2227 int cap_type, cap_len, tcap_len, cap_offset;
2228 int i = 0;
2229
2230 while (i < caps_len) {
2231 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE);
2232 cap_type=opt[i];
2233 cap_len=opt[i+1];
2234 tcap_len=cap_len;
2235 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2236 tok2strbuf(bgp_capcode_values, "Unknown",
2237 cap_type, tokbuf, sizeof(tokbuf)),
2238 cap_type,
2239 cap_len));
2240 ND_TCHECK2(opt[i+2], cap_len);
2241 switch (cap_type) {
2242 case BGP_CAPCODE_MP:
2243 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2244 tok2strbuf(af_values, "Unknown",
2245 EXTRACT_16BITS(opt+i+2),
2246 tokbuf, sizeof(tokbuf)),
2247 EXTRACT_16BITS(opt+i+2),
2248 tok2strbuf(bgp_safi_values, "Unknown",
2249 opt[i+5],
2250 tokbuf, sizeof(tokbuf)),
2251 opt[i+5]));
2252 break;
2253 case BGP_CAPCODE_RESTART:
2254 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2255 ((opt[i+2])&0x80) ? "R" : "none",
2256 EXTRACT_16BITS(opt+i+2)&0xfff));
2257 tcap_len-=2;
2258 cap_offset=4;
2259 while(tcap_len>=4) {
2260 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2261 tok2strbuf(af_values,"Unknown",
2262 EXTRACT_16BITS(opt+i+cap_offset),
2263 tokbuf, sizeof(tokbuf)),
2264 EXTRACT_16BITS(opt+i+cap_offset),
2265 tok2strbuf(bgp_safi_values,"Unknown",
2266 opt[i+cap_offset+2],
2267 tokbuf2, sizeof(tokbuf2)),
2268 opt[i+cap_offset+2],
2269 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" ));
2270 tcap_len-=4;
2271 cap_offset+=4;
2272 }
2273 break;
2274 case BGP_CAPCODE_RR:
2275 case BGP_CAPCODE_RR_CISCO:
2276 break;
2277 case BGP_CAPCODE_AS_NEW:
2278
2279 /*
2280 * Extract the 4 byte AS number encoded.
2281 */
2282 if (cap_len == 4) {
2283 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2284 as_printf(ndo, astostr, sizeof(astostr),
2285 EXTRACT_32BITS(opt + i + 2))));
2286 }
2287 break;
2288 default:
2289 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2290 cap_type));
2291 if (ndo->ndo_vflag <= 1)
2292 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2293 break;
2294 }
2295 if (ndo->ndo_vflag > 1 && cap_len > 0) {
2296 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2297 }
2298 i += BGP_CAP_HEADER_SIZE + cap_len;
2299 }
2300 return;
2301
2302 trunc:
2303 ND_PRINT((ndo, "[|BGP]"));
2304 }
2305
2306 static void
2307 bgp_open_print(netdissect_options *ndo,
2308 const u_char *dat, int length)
2309 {
2310 struct bgp_open bgpo;
2311 struct bgp_opt bgpopt;
2312 const u_char *opt;
2313 int i;
2314 char tokbuf[TOKBUFSIZE];
2315
2316 ND_TCHECK2(dat[0], BGP_OPEN_SIZE);
2317 memcpy(&bgpo, dat, BGP_OPEN_SIZE);
2318
2319 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version));
2320 ND_PRINT((ndo, "my AS %s, ",
2321 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas))));
2322 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime)));
2323 ND_PRINT((ndo, "ID %s", getname(ndo, (u_char *)&bgpo.bgpo_id)));
2324 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen));
2325
2326 /* some little sanity checking */
2327 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE)
2328 return;
2329
2330 /* ugly! */
2331 opt = &((const struct bgp_open *)dat)->bgpo_optlen;
2332 opt++;
2333
2334 i = 0;
2335 while (i < bgpo.bgpo_optlen) {
2336 ND_TCHECK2(opt[i], BGP_OPT_SIZE);
2337 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE);
2338 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
2339 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len));
2340 break;
2341 }
2342
2343 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u",
2344 tok2strbuf(bgp_opt_values,"Unknown",
2345 bgpopt.bgpopt_type,
2346 tokbuf, sizeof(tokbuf)),
2347 bgpopt.bgpopt_type,
2348 bgpopt.bgpopt_len));
2349
2350 /* now let's decode the options we know*/
2351 switch(bgpopt.bgpopt_type) {
2352
2353 case BGP_OPT_CAP:
2354 bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE],
2355 bgpopt.bgpopt_len);
2356 break;
2357
2358 case BGP_OPT_AUTH:
2359 default:
2360 ND_PRINT((ndo, "\n\t no decoder for option %u",
2361 bgpopt.bgpopt_type));
2362 break;
2363 }
2364 i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
2365 }
2366 return;
2367 trunc:
2368 ND_PRINT((ndo, "[|BGP]"));
2369 }
2370
2371 static void
2372 bgp_update_print(netdissect_options *ndo,
2373 const u_char *dat, int length)
2374 {
2375 struct bgp bgp;
2376 const u_char *p;
2377 int withdrawn_routes_len;
2378 int len;
2379 int i;
2380 char tokbuf[TOKBUFSIZE];
2381 #ifndef INET6
2382 char buf[MAXHOSTNAMELEN + 100];
2383 int wpfx;
2384 #endif
2385
2386 ND_TCHECK2(dat[0], BGP_SIZE);
2387 if (length < BGP_SIZE)
2388 goto trunc;
2389 memcpy(&bgp, dat, BGP_SIZE);
2390 p = dat + BGP_SIZE; /*XXX*/
2391 length -= BGP_SIZE;
2392
2393 /* Unfeasible routes */
2394 ND_TCHECK2(p[0], 2);
2395 if (length < 2)
2396 goto trunc;
2397 withdrawn_routes_len = EXTRACT_16BITS(p);
2398 p += 2;
2399 length -= 2;
2400 if (withdrawn_routes_len) {
2401 /*
2402 * Without keeping state from the original NLRI message,
2403 * it's not possible to tell if this a v4 or v6 route,
2404 * so only try to decode it if we're not v6 enabled.
2405 */
2406 ND_TCHECK2(p[0], withdrawn_routes_len);
2407 if (length < withdrawn_routes_len)
2408 goto trunc;
2409 #ifdef INET6
2410 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len));
2411 p += withdrawn_routes_len;
2412 length -= withdrawn_routes_len;
2413 #else
2414 if (withdrawn_routes_len < 2)
2415 goto trunc;
2416 length -= 2;
2417 withdrawn_routes_len -= 2;
2418
2419
2420 ND_PRINT((ndo, "\n\t Withdrawn routes:"));
2421
2422 while(withdrawn_routes_len > 0) {
2423 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
2424 if (wpfx == -1) {
2425 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2426 break;
2427 } else if (wpfx == -2)
2428 goto trunc;
2429 else if (wpfx == -3)
2430 goto trunc; /* bytes left, but not enough */
2431 else {
2432 ND_PRINT((ndo, "\n\t %s", buf));
2433 p += wpfx;
2434 length -= wpfx;
2435 withdrawn_routes_len -= wpfx;
2436 }
2437 }
2438 #endif
2439 }
2440
2441 ND_TCHECK2(p[0], 2);
2442 if (length < 2)
2443 goto trunc;
2444 len = EXTRACT_16BITS(p);
2445 p += 2;
2446 length -= 2;
2447
2448 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2449 /* No withdrawn routes, no path attributes, no NLRI */
2450 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2451 return;
2452 }
2453
2454 if (len) {
2455 /* do something more useful!*/
2456 while (len) {
2457 int aflags, atype, alenlen, alen;
2458
2459 ND_TCHECK2(p[0], 2);
2460 if (len < 2)
2461 goto trunc;
2462 if (length < 2)
2463 goto trunc;
2464 aflags = *p;
2465 atype = *(p + 1);
2466 p += 2;
2467 len -= 2;
2468 length -= 2;
2469 alenlen = bgp_attr_lenlen(aflags, p);
2470 ND_TCHECK2(p[0], alenlen);
2471 if (len < alenlen)
2472 goto trunc;
2473 if (length < alenlen)
2474 goto trunc;
2475 alen = bgp_attr_len(aflags, p);
2476 p += alenlen;
2477 len -= alenlen;
2478 length -= alenlen;
2479
2480 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2481 tok2strbuf(bgp_attr_values, "Unknown Attribute",
2482 atype,
2483 tokbuf, sizeof(tokbuf)),
2484 atype,
2485 alen));
2486
2487 if (aflags) {
2488 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2489 aflags & 0x80 ? "O" : "",
2490 aflags & 0x40 ? "T" : "",
2491 aflags & 0x20 ? "P" : "",
2492 aflags & 0x10 ? "E" : ""));
2493 if (aflags & 0xf)
2494 ND_PRINT((ndo, "+%x", aflags & 0xf));
2495 ND_PRINT((ndo, "]: "));
2496 }
2497 if (len < alen)
2498 goto trunc;
2499 if (length < alen)
2500 goto trunc;
2501 if (!bgp_attr_print(ndo, atype, p, alen))
2502 goto trunc;
2503 p += alen;
2504 len -= alen;
2505 length -= alen;
2506 }
2507 }
2508
2509 if (length) {
2510 /*
2511 * XXX - what if they're using the "Advertisement of
2512 * Multiple Paths in BGP" feature:
2513 *
2514 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/
2515 *
2516 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06
2517 */
2518 ND_PRINT((ndo, "\n\t Updated routes:"));
2519 while (length) {
2520 char buf[MAXHOSTNAMELEN + 100];
2521 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2522 if (i == -1) {
2523 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2524 break;
2525 } else if (i == -2)
2526 goto trunc;
2527 else if (i == -3)
2528 goto trunc; /* bytes left, but not enough */
2529 else {
2530 ND_PRINT((ndo, "\n\t %s", buf));
2531 p += i;
2532 length -= i;
2533 }
2534 }
2535 }
2536 return;
2537 trunc:
2538 ND_PRINT((ndo, "[|BGP]"));
2539 }
2540
2541 static void
2542 bgp_notification_print(netdissect_options *ndo,
2543 const u_char *dat, int length)
2544 {
2545 struct bgp_notification bgpn;
2546 const u_char *tptr;
2547 char tokbuf[TOKBUFSIZE];
2548 char tokbuf2[TOKBUFSIZE];
2549
2550 ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
2551 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
2552
2553 /* some little sanity checking */
2554 if (length<BGP_NOTIFICATION_SIZE)
2555 return;
2556
2557 ND_PRINT((ndo, ", %s (%u)",
2558 tok2strbuf(bgp_notify_major_values, "Unknown Error",
2559 bgpn.bgpn_major, tokbuf, sizeof(tokbuf)),
2560 bgpn.bgpn_major));
2561
2562 switch (bgpn.bgpn_major) {
2563
2564 case BGP_NOTIFY_MAJOR_MSG:
2565 ND_PRINT((ndo, ", subcode %s (%u)",
2566 tok2strbuf(bgp_notify_minor_msg_values, "Unknown",
2567 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
2568 bgpn.bgpn_minor));
2569 break;
2570 case BGP_NOTIFY_MAJOR_OPEN:
2571 ND_PRINT((ndo, ", subcode %s (%u)",
2572 tok2strbuf(bgp_notify_minor_open_values, "Unknown",
2573 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
2574 bgpn.bgpn_minor));
2575 break;
2576 case BGP_NOTIFY_MAJOR_UPDATE:
2577 ND_PRINT((ndo, ", subcode %s (%u)",
2578 tok2strbuf(bgp_notify_minor_update_values, "Unknown",
2579 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
2580 bgpn.bgpn_minor));
2581 break;
2582 case BGP_NOTIFY_MAJOR_CAP:
2583 ND_PRINT((ndo, " subcode %s (%u)",
2584 tok2strbuf(bgp_notify_minor_cap_values, "Unknown",
2585 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
2586 bgpn.bgpn_minor));
2587 case BGP_NOTIFY_MAJOR_CEASE:
2588 ND_PRINT((ndo, ", subcode %s (%u)",
2589 tok2strbuf(bgp_notify_minor_cease_values, "Unknown",
2590 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
2591 bgpn.bgpn_minor));
2592
2593 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2594 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2595 */
2596 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2597 tptr = dat + BGP_NOTIFICATION_SIZE;
2598 ND_TCHECK2(*tptr, 7);
2599 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2600 tok2strbuf(af_values, "Unknown",
2601 EXTRACT_16BITS(tptr), tokbuf, sizeof(tokbuf)),
2602 EXTRACT_16BITS(tptr),
2603 tok2strbuf(bgp_safi_values, "Unknown", *(tptr+2),
2604 tokbuf2, sizeof(tokbuf)),
2605 *(tptr+2),
2606 EXTRACT_32BITS(tptr+3)));
2607 }
2608 break;
2609 default:
2610 break;
2611 }
2612
2613 return;
2614 trunc:
2615 ND_PRINT((ndo, "[|BGP]"));
2616 }
2617
2618 static void
2619 bgp_route_refresh_print(netdissect_options *ndo,
2620 const u_char *pptr, int len) {
2621
2622 const struct bgp_route_refresh *bgp_route_refresh_header;
2623 char tokbuf[TOKBUFSIZE];
2624 char tokbuf2[TOKBUFSIZE];
2625
2626 ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE);
2627
2628 /* some little sanity checking */
2629 if (len<BGP_ROUTE_REFRESH_SIZE)
2630 return;
2631
2632 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2633
2634 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)",
2635 tok2strbuf(af_values,"Unknown",
2636 /* this stinks but the compiler pads the structure
2637 * weird */
2638 EXTRACT_16BITS(&bgp_route_refresh_header->afi),
2639 tokbuf, sizeof(tokbuf)),
2640 EXTRACT_16BITS(&bgp_route_refresh_header->afi),
2641 tok2strbuf(bgp_safi_values,"Unknown",
2642 bgp_route_refresh_header->safi,
2643 tokbuf2, sizeof(tokbuf2)),
2644 bgp_route_refresh_header->safi));
2645
2646 if (ndo->ndo_vflag > 1) {
2647 ND_TCHECK2(*pptr, len);
2648 print_unknown_data(ndo, pptr, "\n\t ", len);
2649 }
2650
2651 return;
2652 trunc:
2653 ND_PRINT((ndo, "[|BGP]"));
2654 }
2655
2656 static int
2657 bgp_header_print(netdissect_options *ndo,
2658 const u_char *dat, int length)
2659 {
2660 struct bgp bgp;
2661 char tokbuf[TOKBUFSIZE];
2662
2663 ND_TCHECK2(dat[0], BGP_SIZE);
2664 memcpy(&bgp, dat, BGP_SIZE);
2665 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2666 tok2strbuf(bgp_msg_values, "Unknown", bgp.bgp_type,
2667 tokbuf, sizeof(tokbuf)),
2668 bgp.bgp_type,
2669 length));
2670
2671 switch (bgp.bgp_type) {
2672 case BGP_OPEN:
2673 bgp_open_print(ndo, dat, length);
2674 break;
2675 case BGP_UPDATE:
2676 bgp_update_print(ndo, dat, length);
2677 break;
2678 case BGP_NOTIFICATION:
2679 bgp_notification_print(ndo, dat, length);
2680 break;
2681 case BGP_KEEPALIVE:
2682 break;
2683 case BGP_ROUTE_REFRESH:
2684 bgp_route_refresh_print(ndo, dat, length);
2685 break;
2686 default:
2687 /* we have no decoder for the BGP message */
2688 ND_TCHECK2(*dat, length);
2689 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type));
2690 print_unknown_data(ndo, dat, "\n\t ", length);
2691 break;
2692 }
2693 return 1;
2694 trunc:
2695 ND_PRINT((ndo, "[|BGP]"));
2696 return 0;
2697 }
2698
2699 void
2700 bgp_print(netdissect_options *ndo,
2701 const u_char *dat, int length)
2702 {
2703 const u_char *p;
2704 const u_char *ep;
2705 const u_char *start;
2706 const u_char marker[] = {
2707 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2708 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2709 };
2710 struct bgp bgp;
2711 uint16_t hlen;
2712 char tokbuf[TOKBUFSIZE];
2713
2714 ep = dat + length;
2715 if (ndo->ndo_snapend < dat + length)
2716 ep = ndo->ndo_snapend;
2717
2718 ND_PRINT((ndo, ": BGP, length: %u", length));
2719
2720 if (ndo->ndo_vflag < 1) /* lets be less chatty */
2721 return;
2722
2723 p = dat;
2724 start = p;
2725 while (p < ep) {
2726 if (!ND_TTEST2(p[0], 1))
2727 break;
2728 if (p[0] != 0xff) {
2729 p++;
2730 continue;
2731 }
2732
2733 if (!ND_TTEST2(p[0], sizeof(marker)))
2734 break;
2735 if (memcmp(p, marker, sizeof(marker)) != 0) {
2736 p++;
2737 continue;
2738 }
2739
2740 /* found BGP header */
2741 ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/
2742 memcpy(&bgp, p, BGP_SIZE);
2743
2744 if (start != p)
2745 ND_PRINT((ndo, " [|BGP]"));
2746
2747 hlen = ntohs(bgp.bgp_len);
2748 if (hlen < BGP_SIZE) {
2749 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
2750 BGP_SIZE));
2751 break;
2752 }
2753
2754 if (ND_TTEST2(p[0], hlen)) {
2755 if (!bgp_header_print(ndo, p, hlen))
2756 return;
2757 p += hlen;
2758 start = p;
2759 } else {
2760 ND_PRINT((ndo, "\n[|BGP %s]",
2761 tok2strbuf(bgp_msg_values,
2762 "Unknown Message Type",
2763 bgp.bgp_type,
2764 tokbuf, sizeof(tokbuf))));
2765 break;
2766 }
2767 }
2768
2769 return;
2770
2771 trunc:
2772 ND_PRINT((ndo, " [|BGP]"));
2773 }
2774
2775 /*
2776 * Local Variables:
2777 * c-style: whitesmith
2778 * c-basic-offset: 4
2779 * End:
2780 */
[mirror] the TCPdump network dissector