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Merge pull request #435 from wolfgangkarall/sigusr1-man
[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 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 snprintf(buf, buflen, "default route target");
721 return 1;
722 }
723
724 if (32 > plen)
725 return -1;
726
727 plen-=32; /* adjust prefix length */
728
729 if (64 < plen)
730 return -1;
731
732 memset(&route_target, 0, sizeof(route_target));
733 ND_TCHECK2(pptr[1], (plen + 7) / 8);
734 memcpy(&route_target, &pptr[1], (plen + 7) / 8);
735 if (plen % 8) {
736 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
737 ((0xff00 >> (plen % 8)) & 0xff);
738 }
739 snprintf(buf, buflen, "origin AS: %s, route target %s",
740 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+1)),
741 bgp_vpn_rd_print(ndo, (u_char *)&route_target));
742
743 return 5 + (plen + 7) / 8;
744
745 trunc:
746 return -2;
747 }
748
749 static int
750 decode_labeled_vpn_prefix4(netdissect_options *ndo,
751 const u_char *pptr, char *buf, u_int buflen)
752 {
753 struct in_addr addr;
754 u_int plen;
755
756 ND_TCHECK(pptr[0]);
757 plen = pptr[0]; /* get prefix length */
758
759 if ((24+64) > plen)
760 return -1;
761
762 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
763
764 if (32 < plen)
765 return -1;
766
767 memset(&addr, 0, sizeof(addr));
768 ND_TCHECK2(pptr[12], (plen + 7) / 8);
769 memcpy(&addr, &pptr[12], (plen + 7) / 8);
770 if (plen % 8) {
771 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
772 ((0xff00 >> (plen % 8)) & 0xff);
773 }
774 /* the label may get offsetted by 4 bits so lets shift it right */
775 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
776 bgp_vpn_rd_print(ndo, pptr+4),
777 getname(ndo, (u_char *)&addr),
778 plen,
779 EXTRACT_24BITS(pptr+1)>>4,
780 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
781
782 return 12 + (plen + 7) / 8;
783
784 trunc:
785 return -2;
786 }
787
788 /*
789 * +-------------------------------+
790 * | |
791 * | RD:IPv4-address (12 octets) |
792 * | |
793 * +-------------------------------+
794 * | MDT Group-address (4 octets) |
795 * +-------------------------------+
796 */
797
798 #define MDT_VPN_NLRI_LEN 16
799
800 static int
801 decode_mdt_vpn_nlri(netdissect_options *ndo,
802 const u_char *pptr, char *buf, u_int buflen)
803 {
804
805 const u_char *rd;
806 const u_char *vpn_ip;
807
808 ND_TCHECK(pptr[0]);
809
810 /* if the NLRI is not predefined length, quit.*/
811 if (*pptr != MDT_VPN_NLRI_LEN * 8)
812 return -1;
813 pptr++;
814
815 /* RD */
816 ND_TCHECK2(pptr[0], 8);
817 rd = pptr;
818 pptr+=8;
819
820 /* IPv4 address */
821 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
822 vpn_ip = pptr;
823 pptr+=sizeof(struct in_addr);
824
825 /* MDT Group Address */
826 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
827
828 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
829 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
830
831 return MDT_VPN_NLRI_LEN + 1;
832
833 trunc:
834
835 return -2;
836 }
837
838 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
839 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
840 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
841 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
842 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
843 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
844 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
845
846 static const struct tok bgp_multicast_vpn_route_type_values[] = {
847 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
848 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
849 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
850 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
851 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
852 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
853 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
854 };
855
856 static int
857 decode_multicast_vpn(netdissect_options *ndo,
858 const u_char *pptr, char *buf, u_int buflen)
859 {
860 uint8_t route_type, route_length, addr_length, sg_length;
861 u_int offset;
862
863 ND_TCHECK2(pptr[0], 2);
864 route_type = *pptr++;
865 route_length = *pptr++;
866
867 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
868 tok2str(bgp_multicast_vpn_route_type_values,
869 "Unknown", route_type),
870 route_type, route_length);
871
872 switch(route_type) {
873 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
874 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
875 offset = strlen(buf);
876 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
877 bgp_vpn_rd_print(ndo, pptr),
878 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
879 (route_length - BGP_VPN_RD_LEN) << 3));
880 break;
881 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
882 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4);
883 offset = strlen(buf);
884 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
885 bgp_vpn_rd_print(ndo, pptr),
886 as_printf(ndo, astostr, sizeof(astostr),
887 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
888 break;
889
890 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
891 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
892 offset = strlen(buf);
893 snprintf(buf + offset, buflen - offset, ", RD: %s",
894 bgp_vpn_rd_print(ndo, pptr));
895 pptr += BGP_VPN_RD_LEN;
896
897 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
898 addr_length = route_length - sg_length;
899
900 ND_TCHECK2(pptr[0], addr_length);
901 offset = strlen(buf);
902 snprintf(buf + offset, buflen - offset, ", Originator %s",
903 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
904 break;
905
906 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
907 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
908 offset = strlen(buf);
909 snprintf(buf + offset, buflen - offset, ", RD: %s",
910 bgp_vpn_rd_print(ndo, pptr));
911 pptr += BGP_VPN_RD_LEN;
912
913 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
914 break;
915
916 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
917 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
918 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
919 offset = strlen(buf);
920 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
921 bgp_vpn_rd_print(ndo, pptr),
922 as_printf(ndo, astostr, sizeof(astostr),
923 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
924 pptr += BGP_VPN_RD_LEN;
925
926 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
927 break;
928
929 /*
930 * no per route-type printing yet.
931 */
932 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
933 default:
934 break;
935 }
936
937 return route_length + 2;
938
939 trunc:
940 return -2;
941 }
942
943 /*
944 * As I remember, some versions of systems have an snprintf() that
945 * returns -1 if the buffer would have overflowed. If the return
946 * value is negative, set buflen to 0, to indicate that we've filled
947 * the buffer up.
948 *
949 * If the return value is greater than buflen, that means that
950 * the buffer would have overflowed; again, set buflen to 0 in
951 * that case.
952 */
953 #define UPDATE_BUF_BUFLEN(buf, buflen, strlen) \
954 if (strlen<0) \
955 buflen=0; \
956 else if ((u_int)strlen>buflen) \
957 buflen=0; \
958 else { \
959 buflen-=strlen; \
960 buf+=strlen; \
961 }
962
963 static int
964 decode_labeled_vpn_l2(netdissect_options *ndo,
965 const u_char *pptr, char *buf, u_int buflen)
966 {
967 int plen,tlen,strlen,tlv_type,tlv_len,ttlv_len;
968
969 ND_TCHECK2(pptr[0], 2);
970 plen=EXTRACT_16BITS(pptr);
971 tlen=plen;
972 pptr+=2;
973 /* Old and new L2VPN NLRI share AFI/SAFI
974 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
975 * and > 17 as old format. Complain for the middle case
976 */
977 if (plen==12) {
978 /* assume AD-only with RD, BGPNH */
979 ND_TCHECK2(pptr[0],12);
980 buf[0]='\0';
981 strlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s",
982 bgp_vpn_rd_print(ndo, pptr),
983 /* need something like getname(ndo, ) here */
984 getname(ndo, pptr+8)
985 );
986 UPDATE_BUF_BUFLEN(buf, buflen, strlen);
987 pptr+=12;
988 tlen-=12;
989 return plen;
990 } else if (plen>17) {
991 /* assume old format */
992 /* RD, ID, LBLKOFF, LBLBASE */
993
994 ND_TCHECK2(pptr[0],15);
995 buf[0]='\0';
996 strlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
997 bgp_vpn_rd_print(ndo, pptr),
998 EXTRACT_16BITS(pptr+8),
999 EXTRACT_16BITS(pptr+10),
1000 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1001 UPDATE_BUF_BUFLEN(buf, buflen, strlen);
1002 pptr+=15;
1003 tlen-=15;
1004
1005 /* ok now the variable part - lets read out TLVs*/
1006 while (tlen>0) {
1007 if (tlen < 3)
1008 return -1;
1009 ND_TCHECK2(pptr[0], 3);
1010 tlv_type=*pptr++;
1011 tlv_len=EXTRACT_16BITS(pptr);
1012 ttlv_len=tlv_len;
1013 pptr+=2;
1014
1015 switch(tlv_type) {
1016 case 1:
1017 if (buflen!=0) {
1018 strlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1019 tlv_type,
1020 tlv_len);
1021 UPDATE_BUF_BUFLEN(buf, buflen, strlen);
1022 }
1023 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
1024 while (ttlv_len>0) {
1025 ND_TCHECK(pptr[0]);
1026 if (buflen!=0) {
1027 strlen=snprintf(buf,buflen, "%02x",*pptr++);
1028 UPDATE_BUF_BUFLEN(buf, buflen, strlen);
1029 }
1030 ttlv_len--;
1031 }
1032 break;
1033 default:
1034 if (buflen!=0) {
1035 strlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1036 tlv_type,
1037 tlv_len);
1038 UPDATE_BUF_BUFLEN(buf, buflen, strlen);
1039 }
1040 break;
1041 }
1042 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
1043 }
1044 return plen+2;
1045
1046 } else {
1047 /* complain bitterly ? */
1048 /* fall through */
1049 goto trunc;
1050 }
1051
1052 trunc:
1053 return -2;
1054 }
1055
1056 #ifdef INET6
1057 int
1058 decode_prefix6(netdissect_options *ndo,
1059 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1060 {
1061 struct in6_addr addr;
1062 u_int plen, plenbytes;
1063
1064 ND_TCHECK(pd[0]);
1065 ITEMCHECK(1);
1066 plen = pd[0];
1067 if (128 < plen)
1068 return -1;
1069 itemlen -= 1;
1070
1071 memset(&addr, 0, sizeof(addr));
1072 plenbytes = (plen + 7) / 8;
1073 ND_TCHECK2(pd[1], plenbytes);
1074 ITEMCHECK(plenbytes);
1075 memcpy(&addr, &pd[1], plenbytes);
1076 if (plen % 8) {
1077 addr.s6_addr[plenbytes - 1] &=
1078 ((0xff00 >> (plen % 8)) & 0xff);
1079 }
1080 snprintf(buf, buflen, "%s/%d", getname6(ndo, (u_char *)&addr), plen);
1081 return 1 + plenbytes;
1082
1083 trunc:
1084 return -2;
1085
1086 badtlv:
1087 return -3;
1088 }
1089
1090 static int
1091 decode_labeled_prefix6(netdissect_options *ndo,
1092 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1093 {
1094 struct in6_addr addr;
1095 u_int plen, plenbytes;
1096
1097 /* prefix length and label = 4 bytes */
1098 ND_TCHECK2(pptr[0], 4);
1099 ITEMCHECK(4);
1100 plen = pptr[0]; /* get prefix length */
1101
1102 if (24 > plen)
1103 return -1;
1104
1105 plen-=24; /* adjust prefixlen - labellength */
1106
1107 if (128 < plen)
1108 return -1;
1109 itemlen -= 4;
1110
1111 memset(&addr, 0, sizeof(addr));
1112 plenbytes = (plen + 7) / 8;
1113 ND_TCHECK2(pptr[4], plenbytes);
1114 memcpy(&addr, &pptr[4], plenbytes);
1115 if (plen % 8) {
1116 addr.s6_addr[plenbytes - 1] &=
1117 ((0xff00 >> (plen % 8)) & 0xff);
1118 }
1119 /* the label may get offsetted by 4 bits so lets shift it right */
1120 snprintf(buf, buflen, "%s/%d, label:%u %s",
1121 getname6(ndo, (u_char *)&addr),
1122 plen,
1123 EXTRACT_24BITS(pptr+1)>>4,
1124 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1125
1126 return 4 + plenbytes;
1127
1128 trunc:
1129 return -2;
1130
1131 badtlv:
1132 return -3;
1133 }
1134
1135 static int
1136 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1137 const u_char *pptr, char *buf, u_int buflen)
1138 {
1139 struct in6_addr addr;
1140 u_int plen;
1141
1142 ND_TCHECK(pptr[0]);
1143 plen = pptr[0]; /* get prefix length */
1144
1145 if ((24+64) > plen)
1146 return -1;
1147
1148 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1149
1150 if (128 < plen)
1151 return -1;
1152
1153 memset(&addr, 0, sizeof(addr));
1154 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1155 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1156 if (plen % 8) {
1157 addr.s6_addr[(plen + 7) / 8 - 1] &=
1158 ((0xff00 >> (plen % 8)) & 0xff);
1159 }
1160 /* the label may get offsetted by 4 bits so lets shift it right */
1161 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1162 bgp_vpn_rd_print(ndo, pptr+4),
1163 getname6(ndo, (u_char *)&addr),
1164 plen,
1165 EXTRACT_24BITS(pptr+1)>>4,
1166 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1167
1168 return 12 + (plen + 7) / 8;
1169
1170 trunc:
1171 return -2;
1172 }
1173 #endif
1174
1175 static int
1176 decode_clnp_prefix(netdissect_options *ndo,
1177 const u_char *pptr, char *buf, u_int buflen)
1178 {
1179 uint8_t addr[19];
1180 u_int plen;
1181
1182 ND_TCHECK(pptr[0]);
1183 plen = pptr[0]; /* get prefix length */
1184
1185 if (152 < plen)
1186 return -1;
1187
1188 memset(&addr, 0, sizeof(addr));
1189 ND_TCHECK2(pptr[4], (plen + 7) / 8);
1190 memcpy(&addr, &pptr[4], (plen + 7) / 8);
1191 if (plen % 8) {
1192 addr[(plen + 7) / 8 - 1] &=
1193 ((0xff00 >> (plen % 8)) & 0xff);
1194 }
1195 snprintf(buf, buflen, "%s/%d",
1196 isonsap_string(addr,(plen + 7) / 8),
1197 plen);
1198
1199 return 1 + (plen + 7) / 8;
1200
1201 trunc:
1202 return -2;
1203 }
1204
1205 static int
1206 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1207 const u_char *pptr, char *buf, u_int buflen)
1208 {
1209 uint8_t addr[19];
1210 u_int plen;
1211
1212 ND_TCHECK(pptr[0]);
1213 plen = pptr[0]; /* get prefix length */
1214
1215 if ((24+64) > plen)
1216 return -1;
1217
1218 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1219
1220 if (152 < plen)
1221 return -1;
1222
1223 memset(&addr, 0, sizeof(addr));
1224 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1225 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1226 if (plen % 8) {
1227 addr[(plen + 7) / 8 - 1] &=
1228 ((0xff00 >> (plen % 8)) & 0xff);
1229 }
1230 /* the label may get offsetted by 4 bits so lets shift it right */
1231 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1232 bgp_vpn_rd_print(ndo, pptr+4),
1233 isonsap_string(addr,(plen + 7) / 8),
1234 plen,
1235 EXTRACT_24BITS(pptr+1)>>4,
1236 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1237
1238 return 12 + (plen + 7) / 8;
1239
1240 trunc:
1241 return -2;
1242 }
1243
1244 /*
1245 * bgp_attr_get_as_size
1246 *
1247 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1248 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1249 * support, exchange AS-Path with the same path-attribute type value 0x02.
1250 */
1251 static int
1252 bgp_attr_get_as_size(netdissect_options *ndo,
1253 uint8_t bgpa_type, const u_char *pptr, int len)
1254 {
1255 const u_char *tptr = pptr;
1256
1257 /*
1258 * If the path attribute is the optional AS4 path type, then we already
1259 * know, that ASs must be encoded in 4 byte format.
1260 */
1261 if (bgpa_type == BGPTYPE_AS4_PATH) {
1262 return 4;
1263 }
1264
1265 /*
1266 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1267 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1268 * each.
1269 */
1270 while (tptr < pptr + len) {
1271 ND_TCHECK(tptr[0]);
1272
1273 /*
1274 * If we do not find a valid segment type, our guess might be wrong.
1275 */
1276 if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) {
1277 goto trunc;
1278 }
1279 ND_TCHECK(tptr[1]);
1280 tptr += 2 + tptr[1] * 2;
1281 }
1282
1283 /*
1284 * If we correctly reached end of the AS path attribute data content,
1285 * then most likely ASs were indeed encoded as 2 bytes.
1286 */
1287 if (tptr == pptr + len) {
1288 return 2;
1289 }
1290
1291 trunc:
1292
1293 /*
1294 * We can come here, either we did not have enough data, or if we
1295 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1296 * so that calller can try to decode each AS as of 4 bytes. If indeed
1297 * there was not enough data, it will crib and end the parse anyways.
1298 */
1299 return 4;
1300 }
1301
1302 static int
1303 bgp_attr_print(netdissect_options *ndo,
1304 u_int atype, const u_char *pptr, u_int len)
1305 {
1306 int i;
1307 uint16_t af;
1308 uint8_t safi, snpa, nhlen;
1309 union { /* copy buffer for bandwidth values */
1310 float f;
1311 uint32_t i;
1312 } bw;
1313 int advance;
1314 u_int tlen;
1315 const u_char *tptr;
1316 char buf[MAXHOSTNAMELEN + 100];
1317 char tokbuf[TOKBUFSIZE];
1318 int as_size;
1319
1320 tptr = pptr;
1321 tlen=len;
1322
1323 switch (atype) {
1324 case BGPTYPE_ORIGIN:
1325 if (len != 1)
1326 ND_PRINT((ndo, "invalid len"));
1327 else {
1328 ND_TCHECK(*tptr);
1329 ND_PRINT((ndo, "%s", tok2strbuf(bgp_origin_values,
1330 "Unknown Origin Typecode",
1331 tptr[0],
1332 tokbuf, sizeof(tokbuf))));
1333 }
1334 break;
1335
1336
1337 /*
1338 * Process AS4 byte path and AS2 byte path attributes here.
1339 */
1340 case BGPTYPE_AS4_PATH:
1341 case BGPTYPE_AS_PATH:
1342 if (len % 2) {
1343 ND_PRINT((ndo, "invalid len"));
1344 break;
1345 }
1346 if (!len) {
1347 ND_PRINT((ndo, "empty"));
1348 break;
1349 }
1350
1351 /*
1352 * BGP updates exchanged between New speakers that support 4
1353 * byte AS, ASs are always encoded in 4 bytes. There is no
1354 * definitive way to find this, just by the packet's
1355 * contents. So, check for packet's TLV's sanity assuming
1356 * 2 bytes first, and it does not pass, assume that ASs are
1357 * encoded in 4 bytes format and move on.
1358 */
1359 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1360
1361 while (tptr < pptr + len) {
1362 ND_TCHECK(tptr[0]);
1363 ND_PRINT((ndo, "%s", tok2strbuf(bgp_as_path_segment_open_values,
1364 "?", tptr[0],
1365 tokbuf, sizeof(tokbuf))));
1366 for (i = 0; i < tptr[1] * as_size; i += as_size) {
1367 ND_TCHECK2(tptr[2 + i], as_size);
1368 ND_PRINT((ndo, "%s ",
1369 as_printf(ndo, astostr, sizeof(astostr),
1370 as_size == 2 ?
1371 EXTRACT_16BITS(&tptr[2 + i]) :
1372 EXTRACT_32BITS(&tptr[2 + i]))));
1373 }
1374 ND_TCHECK(tptr[0]);
1375 ND_PRINT((ndo, "%s", tok2strbuf(bgp_as_path_segment_close_values,
1376 "?", tptr[0],
1377 tokbuf, sizeof(tokbuf))));
1378 ND_TCHECK(tptr[1]);
1379 tptr += 2 + tptr[1] * as_size;
1380 }
1381 break;
1382 case BGPTYPE_NEXT_HOP:
1383 if (len != 4)
1384 ND_PRINT((ndo, "invalid len"));
1385 else {
1386 ND_TCHECK2(tptr[0], 4);
1387 ND_PRINT((ndo, "%s", getname(ndo, tptr)));
1388 }
1389 break;
1390 case BGPTYPE_MULTI_EXIT_DISC:
1391 case BGPTYPE_LOCAL_PREF:
1392 if (len != 4)
1393 ND_PRINT((ndo, "invalid len"));
1394 else {
1395 ND_TCHECK2(tptr[0], 4);
1396 ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr)));
1397 }
1398 break;
1399 case BGPTYPE_ATOMIC_AGGREGATE:
1400 if (len != 0)
1401 ND_PRINT((ndo, "invalid len"));
1402 break;
1403 case BGPTYPE_AGGREGATOR:
1404
1405 /*
1406 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1407 * the length of this PA can be either 6 bytes or 8 bytes.
1408 */
1409 if (len != 6 && len != 8) {
1410 ND_PRINT((ndo, "invalid len"));
1411 break;
1412 }
1413 ND_TCHECK2(tptr[0], len);
1414 if (len == 6) {
1415 ND_PRINT((ndo, " AS #%s, origin %s",
1416 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)),
1417 getname(ndo, tptr + 2)));
1418 } else {
1419 ND_PRINT((ndo, " AS #%s, origin %s",
1420 as_printf(ndo, astostr, sizeof(astostr),
1421 EXTRACT_32BITS(tptr)), getname(ndo, tptr + 4)));
1422 }
1423 break;
1424 case BGPTYPE_AGGREGATOR4:
1425 if (len != 8) {
1426 ND_PRINT((ndo, "invalid len"));
1427 break;
1428 }
1429 ND_TCHECK2(tptr[0], 8);
1430 ND_PRINT((ndo, " AS #%s, origin %s",
1431 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)),
1432 getname(ndo, tptr + 4)));
1433 break;
1434 case BGPTYPE_COMMUNITIES:
1435 if (len % 4) {
1436 ND_PRINT((ndo, "invalid len"));
1437 break;
1438 }
1439 while (tlen>0) {
1440 uint32_t comm;
1441 ND_TCHECK2(tptr[0], 4);
1442 comm = EXTRACT_32BITS(tptr);
1443 switch (comm) {
1444 case BGP_COMMUNITY_NO_EXPORT:
1445 ND_PRINT((ndo, " NO_EXPORT"));
1446 break;
1447 case BGP_COMMUNITY_NO_ADVERT:
1448 ND_PRINT((ndo, " NO_ADVERTISE"));
1449 break;
1450 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1451 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1452 break;
1453 default:
1454 ND_PRINT((ndo, "%u:%u%s",
1455 (comm >> 16) & 0xffff,
1456 comm & 0xffff,
1457 (tlen>4) ? ", " : ""));
1458 break;
1459 }
1460 tlen -=4;
1461 tptr +=4;
1462 }
1463 break;
1464 case BGPTYPE_ORIGINATOR_ID:
1465 if (len != 4) {
1466 ND_PRINT((ndo, "invalid len"));
1467 break;
1468 }
1469 ND_TCHECK2(tptr[0], 4);
1470 ND_PRINT((ndo, "%s",getname(ndo, tptr)));
1471 break;
1472 case BGPTYPE_CLUSTER_LIST:
1473 if (len % 4) {
1474 ND_PRINT((ndo, "invalid len"));
1475 break;
1476 }
1477 while (tlen>0) {
1478 ND_TCHECK2(tptr[0], 4);
1479 ND_PRINT((ndo, "%s%s",
1480 getname(ndo, tptr),
1481 (tlen>4) ? ", " : ""));
1482 tlen -=4;
1483 tptr +=4;
1484 }
1485 break;
1486 case BGPTYPE_MP_REACH_NLRI:
1487 ND_TCHECK2(tptr[0], 3);
1488 af = EXTRACT_16BITS(tptr);
1489 safi = tptr[2];
1490
1491 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1492 tok2strbuf(af_values, "Unknown AFI", af,
1493 tokbuf, sizeof(tokbuf)),
1494 af,
1495 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1496 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi,
1497 tokbuf, sizeof(tokbuf)),
1498 safi));
1499
1500 switch(af<<8 | safi) {
1501 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1502 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1503 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1504 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1505 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1506 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1507 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1508 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1509 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1510 case (AFNUM_INET<<8 | SAFNUM_MDT):
1511 #ifdef INET6
1512 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1513 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1514 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1515 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1516 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1517 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1518 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1519 #endif
1520 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1521 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1522 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1523 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1524 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1525 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1526 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1527 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1528 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1529 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1530 break;
1531 default:
1532 ND_TCHECK2(tptr[0], tlen);
1533 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1534 if (ndo->ndo_vflag <= 1)
1535 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1536 goto done;
1537 break;
1538 }
1539
1540 tptr +=3;
1541
1542 ND_TCHECK(tptr[0]);
1543 nhlen = tptr[0];
1544 tlen = nhlen;
1545 tptr++;
1546
1547 if (tlen) {
1548 int nnh = 0;
1549 ND_PRINT((ndo, "\n\t nexthop: "));
1550 while (tlen > 0) {
1551 if ( nnh++ > 0 ) {
1552 ND_PRINT((ndo, ", " ));
1553 }
1554 switch(af<<8 | safi) {
1555 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1556 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1557 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1558 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1559 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1560 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1561 case (AFNUM_INET<<8 | SAFNUM_MDT):
1562 if (tlen < (int)sizeof(struct in_addr)) {
1563 ND_PRINT((ndo, "invalid len"));
1564 tlen = 0;
1565 } else {
1566 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1567 ND_PRINT((ndo, "%s",getname(ndo, tptr)));
1568 tlen -= sizeof(struct in_addr);
1569 tptr += sizeof(struct in_addr);
1570 }
1571 break;
1572 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1573 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1574 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1575 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) {
1576 ND_PRINT((ndo, "invalid len"));
1577 tlen = 0;
1578 } else {
1579 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1580 ND_PRINT((ndo, "RD: %s, %s",
1581 bgp_vpn_rd_print(ndo, tptr),
1582 getname(ndo, tptr+BGP_VPN_RD_LEN)));
1583 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1584 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1585 }
1586 break;
1587 #ifdef INET6
1588 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1589 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1590 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1591 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1592 if (tlen < (int)sizeof(struct in6_addr)) {
1593 ND_PRINT((ndo, "invalid len"));
1594 tlen = 0;
1595 } else {
1596 ND_TCHECK2(tptr[0], sizeof(struct in6_addr));
1597 ND_PRINT((ndo, "%s", getname6(ndo, tptr)));
1598 tlen -= sizeof(struct in6_addr);
1599 tptr += sizeof(struct in6_addr);
1600 }
1601 break;
1602 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1603 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1604 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1605 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) {
1606 ND_PRINT((ndo, "invalid len"));
1607 tlen = 0;
1608 } else {
1609 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1610 ND_PRINT((ndo, "RD: %s, %s",
1611 bgp_vpn_rd_print(ndo, tptr),
1612 getname6(ndo, tptr+BGP_VPN_RD_LEN)));
1613 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1614 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1615 }
1616 break;
1617 #endif
1618 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1619 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1620 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1621 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1622 if (tlen < (int)sizeof(struct in_addr)) {
1623 ND_PRINT((ndo, "invalid len"));
1624 tlen = 0;
1625 } else {
1626 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1627 ND_PRINT((ndo, "%s", getname(ndo, tptr)));
1628 tlen -= (sizeof(struct in_addr));
1629 tptr += (sizeof(struct in_addr));
1630 }
1631 break;
1632 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1633 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1634 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1635 ND_TCHECK2(tptr[0], tlen);
1636 ND_PRINT((ndo, "%s", isonsap_string(tptr, tlen)));
1637 tptr += tlen;
1638 tlen = 0;
1639 break;
1640
1641 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1642 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1643 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1644 if (tlen < BGP_VPN_RD_LEN+1) {
1645 ND_PRINT((ndo, "invalid len"));
1646 tlen = 0;
1647 } else {
1648 ND_TCHECK2(tptr[0], tlen);
1649 ND_PRINT((ndo, "RD: %s, %s",
1650 bgp_vpn_rd_print(ndo, tptr),
1651 isonsap_string(tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1652 /* rfc986 mapped IPv4 address ? */
1653 if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601)
1654 ND_PRINT((ndo, " = %s", getname(ndo, tptr+BGP_VPN_RD_LEN+4)));
1655 #ifdef INET6
1656 /* rfc1888 mapped IPv6 address ? */
1657 else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000)
1658 ND_PRINT((ndo, " = %s", getname6(ndo, tptr+BGP_VPN_RD_LEN+3)));
1659 #endif
1660 tptr += tlen;
1661 tlen = 0;
1662 }
1663 break;
1664 default:
1665 ND_TCHECK2(tptr[0], tlen);
1666 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1667 if (ndo->ndo_vflag <= 1)
1668 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1669 tptr += tlen;
1670 tlen = 0;
1671 goto done;
1672 break;
1673 }
1674 }
1675 }
1676 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1677 tptr += tlen;
1678
1679 ND_TCHECK(tptr[0]);
1680 snpa = tptr[0];
1681 tptr++;
1682
1683 if (snpa) {
1684 ND_PRINT((ndo, "\n\t %u SNPA", snpa));
1685 for (/*nothing*/; snpa > 0; snpa--) {
1686 ND_TCHECK(tptr[0]);
1687 ND_PRINT((ndo, "\n\t %d bytes", tptr[0]));
1688 tptr += tptr[0] + 1;
1689 }
1690 } else {
1691 ND_PRINT((ndo, ", no SNPA"));
1692 }
1693
1694 while (len - (tptr - pptr) > 0) {
1695 switch (af<<8 | safi) {
1696 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1697 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1698 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1699 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1700 if (advance == -1)
1701 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1702 else if (advance == -2)
1703 goto trunc;
1704 else if (advance == -3)
1705 break; /* bytes left, but not enough */
1706 else
1707 ND_PRINT((ndo, "\n\t %s", buf));
1708 break;
1709 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1710 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1711 if (advance == -1)
1712 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1713 else if (advance == -2)
1714 goto trunc;
1715 else if (advance == -3)
1716 break; /* bytes left, but not enough */
1717 else
1718 ND_PRINT((ndo, "\n\t %s", buf));
1719 break;
1720 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1721 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1722 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1723 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1724 if (advance == -1)
1725 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1726 else if (advance == -2)
1727 goto trunc;
1728 else
1729 ND_PRINT((ndo, "\n\t %s", buf));
1730 break;
1731 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1732 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf));
1733 if (advance == -1)
1734 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1735 else if (advance == -2)
1736 goto trunc;
1737 else
1738 ND_PRINT((ndo, "\n\t %s", buf));
1739 break;
1740 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1741 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1742 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1743 if (advance == -1)
1744 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1745 else if (advance == -2)
1746 goto trunc;
1747 else
1748 ND_PRINT((ndo, "\n\t %s", buf));
1749 break;
1750
1751 case (AFNUM_INET<<8 | SAFNUM_MDT):
1752 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1753 if (advance == -1)
1754 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1755 else if (advance == -2)
1756 goto trunc;
1757 else
1758 ND_PRINT((ndo, "\n\t %s", buf));
1759 break;
1760 #ifdef INET6
1761 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1762 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1763 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1764 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1765 if (advance == -1)
1766 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1767 else if (advance == -2)
1768 goto trunc;
1769 else if (advance == -3)
1770 break; /* bytes left, but not enough */
1771 else
1772 ND_PRINT((ndo, "\n\t %s", buf));
1773 break;
1774 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1775 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1776 if (advance == -1)
1777 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1778 else if (advance == -2)
1779 goto trunc;
1780 else if (advance == -3)
1781 break; /* bytes left, but not enough */
1782 else
1783 ND_PRINT((ndo, "\n\t %s", buf));
1784 break;
1785 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1786 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1787 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1788 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1789 if (advance == -1)
1790 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1791 else if (advance == -2)
1792 goto trunc;
1793 else
1794 ND_PRINT((ndo, "\n\t %s", buf));
1795 break;
1796 #endif
1797 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1798 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1799 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1800 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1801 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1802 if (advance == -1)
1803 ND_PRINT((ndo, "\n\t (illegal length)"));
1804 else if (advance == -2)
1805 goto trunc;
1806 else
1807 ND_PRINT((ndo, "\n\t %s", buf));
1808 break;
1809 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1810 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1811 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1812 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1813 if (advance == -1)
1814 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1815 else if (advance == -2)
1816 goto trunc;
1817 else
1818 ND_PRINT((ndo, "\n\t %s", buf));
1819 break;
1820 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1821 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1822 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1823 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1824 if (advance == -1)
1825 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1826 else if (advance == -2)
1827 goto trunc;
1828 else
1829 ND_PRINT((ndo, "\n\t %s", buf));
1830 break;
1831 default:
1832 ND_TCHECK2(*tptr,tlen);
1833 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1834 if (ndo->ndo_vflag <= 1)
1835 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1836 advance = 0;
1837 tptr = pptr + len;
1838 break;
1839 }
1840 if (advance < 0)
1841 break;
1842 tptr += advance;
1843 }
1844 done:
1845 break;
1846
1847 case BGPTYPE_MP_UNREACH_NLRI:
1848 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE);
1849 af = EXTRACT_16BITS(tptr);
1850 safi = tptr[2];
1851
1852 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1853 tok2strbuf(af_values, "Unknown AFI", af,
1854 tokbuf, sizeof(tokbuf)),
1855 af,
1856 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1857 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi,
1858 tokbuf, sizeof(tokbuf)),
1859 safi));
1860
1861 if (len == BGP_MP_NLRI_MINSIZE)
1862 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
1863
1864 tptr += 3;
1865
1866 while (len - (tptr - pptr) > 0) {
1867 switch (af<<8 | safi) {
1868 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1869 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1870 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1871 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1872 if (advance == -1)
1873 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1874 else if (advance == -2)
1875 goto trunc;
1876 else if (advance == -3)
1877 break; /* bytes left, but not enough */
1878 else
1879 ND_PRINT((ndo, "\n\t %s", buf));
1880 break;
1881 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1882 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1883 if (advance == -1)
1884 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1885 else if (advance == -2)
1886 goto trunc;
1887 else if (advance == -3)
1888 break; /* bytes left, but not enough */
1889 else
1890 ND_PRINT((ndo, "\n\t %s", buf));
1891 break;
1892 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1893 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1894 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1895 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1896 if (advance == -1)
1897 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1898 else if (advance == -2)
1899 goto trunc;
1900 else
1901 ND_PRINT((ndo, "\n\t %s", buf));
1902 break;
1903 #ifdef INET6
1904 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1905 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1906 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1907 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1908 if (advance == -1)
1909 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1910 else if (advance == -2)
1911 goto trunc;
1912 else if (advance == -3)
1913 break; /* bytes left, but not enough */
1914 else
1915 ND_PRINT((ndo, "\n\t %s", buf));
1916 break;
1917 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1918 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1919 if (advance == -1)
1920 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1921 else if (advance == -2)
1922 goto trunc;
1923 else if (advance == -3)
1924 break; /* bytes left, but not enough */
1925 else
1926 ND_PRINT((ndo, "\n\t %s", buf));
1927 break;
1928 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1929 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1930 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1931 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1932 if (advance == -1)
1933 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1934 else if (advance == -2)
1935 goto trunc;
1936 else
1937 ND_PRINT((ndo, "\n\t %s", buf));
1938 break;
1939 #endif
1940 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1941 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1942 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1943 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1944 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1945 if (advance == -1)
1946 ND_PRINT((ndo, "\n\t (illegal length)"));
1947 else if (advance == -2)
1948 goto trunc;
1949 else
1950 ND_PRINT((ndo, "\n\t %s", buf));
1951 break;
1952 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1953 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1954 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1955 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1956 if (advance == -1)
1957 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1958 else if (advance == -2)
1959 goto trunc;
1960 else
1961 ND_PRINT((ndo, "\n\t %s", buf));
1962 break;
1963 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1964 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1965 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1966 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1967 if (advance == -1)
1968 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1969 else if (advance == -2)
1970 goto trunc;
1971 else
1972 ND_PRINT((ndo, "\n\t %s", buf));
1973 break;
1974 case (AFNUM_INET<<8 | SAFNUM_MDT):
1975 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1976 if (advance == -1)
1977 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1978 else if (advance == -2)
1979 goto trunc;
1980 else
1981 ND_PRINT((ndo, "\n\t %s", buf));
1982 break;
1983 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1984 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1985 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1986 if (advance == -1)
1987 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1988 else if (advance == -2)
1989 goto trunc;
1990 else
1991 ND_PRINT((ndo, "\n\t %s", buf));
1992 break;
1993 default:
1994 ND_TCHECK2(*(tptr-3),tlen);
1995 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
1996 if (ndo->ndo_vflag <= 1)
1997 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
1998 advance = 0;
1999 tptr = pptr + len;
2000 break;
2001 }
2002 if (advance < 0)
2003 break;
2004 tptr += advance;
2005 }
2006 break;
2007 case BGPTYPE_EXTD_COMMUNITIES:
2008 if (len % 8) {
2009 ND_PRINT((ndo, "invalid len"));
2010 break;
2011 }
2012 while (tlen>0) {
2013 uint16_t extd_comm;
2014
2015 ND_TCHECK2(tptr[0], 2);
2016 extd_comm=EXTRACT_16BITS(tptr);
2017
2018 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]",
2019 tok2strbuf(bgp_extd_comm_subtype_values,
2020 "unknown extd community typecode",
2021 extd_comm, tokbuf, sizeof(tokbuf)),
2022 extd_comm,
2023 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2024
2025 ND_TCHECK2(*(tptr+2), 6);
2026 switch(extd_comm) {
2027 case BGP_EXT_COM_RT_0:
2028 case BGP_EXT_COM_RO_0:
2029 case BGP_EXT_COM_L2VPN_RT_0:
2030 ND_PRINT((ndo, ": %u:%u (= %s)",
2031 EXTRACT_16BITS(tptr+2),
2032 EXTRACT_32BITS(tptr+4),
2033 getname(ndo, tptr+4)));
2034 break;
2035 case BGP_EXT_COM_RT_1:
2036 case BGP_EXT_COM_RO_1:
2037 case BGP_EXT_COM_L2VPN_RT_1:
2038 case BGP_EXT_COM_VRF_RT_IMP:
2039 ND_PRINT((ndo, ": %s:%u",
2040 getname(ndo, tptr+2),
2041 EXTRACT_16BITS(tptr+6)));
2042 break;
2043 case BGP_EXT_COM_RT_2:
2044 case BGP_EXT_COM_RO_2:
2045 ND_PRINT((ndo, ": %s:%u",
2046 as_printf(ndo, astostr, sizeof(astostr),
2047 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6)));
2048 break;
2049 case BGP_EXT_COM_LINKBAND:
2050 bw.i = EXTRACT_32BITS(tptr+2);
2051 ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2052 bw.f*8/1000000));
2053 break;
2054 case BGP_EXT_COM_VPN_ORIGIN:
2055 case BGP_EXT_COM_VPN_ORIGIN2:
2056 case BGP_EXT_COM_VPN_ORIGIN3:
2057 case BGP_EXT_COM_VPN_ORIGIN4:
2058 case BGP_EXT_COM_OSPF_RID:
2059 case BGP_EXT_COM_OSPF_RID2:
2060 ND_PRINT((ndo, "%s", getname(ndo, tptr+2)));
2061 break;
2062 case BGP_EXT_COM_OSPF_RTYPE:
2063 case BGP_EXT_COM_OSPF_RTYPE2:
2064 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2065 getname(ndo, tptr+2),
2066 tok2strbuf(bgp_extd_comm_ospf_rtype_values,
2067 "unknown (0x%02x)",
2068 *(tptr+6),
2069 tokbuf, sizeof(tokbuf)),
2070 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2071 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2072 break;
2073 case BGP_EXT_COM_L2INFO:
2074 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2075 tok2strbuf(l2vpn_encaps_values,
2076 "unknown encaps",
2077 *(tptr+2),
2078 tokbuf, sizeof(tokbuf)),
2079 *(tptr+3),
2080 EXTRACT_16BITS(tptr+4)));
2081 break;
2082 case BGP_EXT_COM_SOURCE_AS:
2083 ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2)));
2084 break;
2085 default:
2086 ND_TCHECK2(*tptr,8);
2087 print_unknown_data(ndo, tptr, "\n\t ", 8);
2088 break;
2089 }
2090 tlen -=8;
2091 tptr +=8;
2092 }
2093 break;
2094
2095 case BGPTYPE_PMSI_TUNNEL:
2096 {
2097 uint8_t tunnel_type, flags;
2098
2099 tunnel_type = *(tptr+1);
2100 flags = *tptr;
2101 tlen = len;
2102
2103 ND_TCHECK2(tptr[0], 5);
2104 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2105 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2106 tunnel_type,
2107 bittok2str(bgp_pmsi_flag_values, "none", flags),
2108 EXTRACT_24BITS(tptr+2)>>4));
2109
2110 tptr +=5;
2111 tlen -= 5;
2112
2113 switch (tunnel_type) {
2114 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2115 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2116 ND_TCHECK2(tptr[0], 8);
2117 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s",
2118 ipaddr_string(ndo, tptr),
2119 ipaddr_string(ndo, tptr+4)));
2120 break;
2121
2122 case BGP_PMSI_TUNNEL_PIM_SSM:
2123 ND_TCHECK2(tptr[0], 8);
2124 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s",
2125 ipaddr_string(ndo, tptr),
2126 ipaddr_string(ndo, tptr+4)));
2127 break;
2128 case BGP_PMSI_TUNNEL_INGRESS:
2129 ND_TCHECK2(tptr[0], 4);
2130 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s",
2131 ipaddr_string(ndo, tptr)));
2132 break;
2133 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2134 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2135 ND_TCHECK2(tptr[0], 8);
2136 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x",
2137 ipaddr_string(ndo, tptr),
2138 EXTRACT_32BITS(tptr+4)));
2139 break;
2140 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2141 ND_TCHECK2(tptr[0], 8);
2142 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2143 ipaddr_string(ndo, tptr),
2144 EXTRACT_32BITS(tptr+4)));
2145 break;
2146 default:
2147 if (ndo->ndo_vflag <= 1) {
2148 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2149 }
2150 }
2151 break;
2152 }
2153 case BGPTYPE_ATTR_SET:
2154 ND_TCHECK2(tptr[0], 4);
2155 if (len < 4)
2156 goto trunc;
2157 ND_PRINT((ndo, "\n\t Origin AS: %s",
2158 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr))));
2159 tptr+=4;
2160 len -=4;
2161
2162 while (len) {
2163 u_int aflags, atype, alenlen, alen;
2164
2165 ND_TCHECK2(tptr[0], 2);
2166 if (len < 2)
2167 goto trunc;
2168 aflags = *tptr;
2169 atype = *(tptr + 1);
2170 tptr += 2;
2171 len -= 2;
2172 alenlen = bgp_attr_lenlen(aflags, tptr);
2173 ND_TCHECK2(tptr[0], alenlen);
2174 if (len < alenlen)
2175 goto trunc;
2176 alen = bgp_attr_len(aflags, tptr);
2177 tptr += alenlen;
2178 len -= alenlen;
2179
2180 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2181 tok2strbuf(bgp_attr_values,
2182 "Unknown Attribute", atype,
2183 tokbuf, sizeof(tokbuf)),
2184 atype,
2185 alen));
2186
2187 if (aflags) {
2188 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2189 aflags & 0x80 ? "O" : "",
2190 aflags & 0x40 ? "T" : "",
2191 aflags & 0x20 ? "P" : "",
2192 aflags & 0x10 ? "E" : ""));
2193 if (aflags & 0xf)
2194 ND_PRINT((ndo, "+%x", aflags & 0xf));
2195 ND_PRINT((ndo, "]: "));
2196 }
2197 /* FIXME check for recursion */
2198 if (!bgp_attr_print(ndo, atype, tptr, alen))
2199 return 0;
2200 tptr += alen;
2201 len -= alen;
2202 }
2203 break;
2204
2205
2206 default:
2207 ND_TCHECK2(*pptr,len);
2208 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2209 if (ndo->ndo_vflag <= 1)
2210 print_unknown_data(ndo, pptr, "\n\t ", len);
2211 break;
2212 }
2213 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2214 ND_TCHECK2(*pptr,len);
2215 print_unknown_data(ndo, pptr, "\n\t ", len);
2216 }
2217 return 1;
2218
2219 trunc:
2220 return 0;
2221 }
2222
2223 static void
2224 bgp_capabilities_print(netdissect_options *ndo,
2225 const u_char *opt, int caps_len)
2226 {
2227 char tokbuf[TOKBUFSIZE];
2228 char tokbuf2[TOKBUFSIZE];
2229 int cap_type, cap_len, tcap_len, cap_offset;
2230 int i = 0;
2231
2232 while (i < caps_len) {
2233 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE);
2234 cap_type=opt[i];
2235 cap_len=opt[i+1];
2236 tcap_len=cap_len;
2237 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2238 tok2strbuf(bgp_capcode_values, "Unknown",
2239 cap_type, tokbuf, sizeof(tokbuf)),
2240 cap_type,
2241 cap_len));
2242 ND_TCHECK2(opt[i+2], cap_len);
2243 switch (cap_type) {
2244 case BGP_CAPCODE_MP:
2245 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2246 tok2strbuf(af_values, "Unknown",
2247 EXTRACT_16BITS(opt+i+2),
2248 tokbuf, sizeof(tokbuf)),
2249 EXTRACT_16BITS(opt+i+2),
2250 tok2strbuf(bgp_safi_values, "Unknown",
2251 opt[i+5],
2252 tokbuf, sizeof(tokbuf)),
2253 opt[i+5]));
2254 break;
2255 case BGP_CAPCODE_RESTART:
2256 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2257 ((opt[i+2])&0x80) ? "R" : "none",
2258 EXTRACT_16BITS(opt+i+2)&0xfff));
2259 tcap_len-=2;
2260 cap_offset=4;
2261 while(tcap_len>=4) {
2262 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2263 tok2strbuf(af_values,"Unknown",
2264 EXTRACT_16BITS(opt+i+cap_offset),
2265 tokbuf, sizeof(tokbuf)),
2266 EXTRACT_16BITS(opt+i+cap_offset),
2267 tok2strbuf(bgp_safi_values,"Unknown",
2268 opt[i+cap_offset+2],
2269 tokbuf2, sizeof(tokbuf2)),
2270 opt[i+cap_offset+2],
2271 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" ));
2272 tcap_len-=4;
2273 cap_offset+=4;
2274 }
2275 break;
2276 case BGP_CAPCODE_RR:
2277 case BGP_CAPCODE_RR_CISCO:
2278 break;
2279 case BGP_CAPCODE_AS_NEW:
2280
2281 /*
2282 * Extract the 4 byte AS number encoded.
2283 */
2284 if (cap_len == 4) {
2285 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2286 as_printf(ndo, astostr, sizeof(astostr),
2287 EXTRACT_32BITS(opt + i + 2))));
2288 }
2289 break;
2290 default:
2291 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2292 cap_type));
2293 if (ndo->ndo_vflag <= 1)
2294 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2295 break;
2296 }
2297 if (ndo->ndo_vflag > 1 && cap_len > 0) {
2298 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2299 }
2300 i += BGP_CAP_HEADER_SIZE + cap_len;
2301 }
2302 return;
2303
2304 trunc:
2305 ND_PRINT((ndo, "[|BGP]"));
2306 }
2307
2308 static void
2309 bgp_open_print(netdissect_options *ndo,
2310 const u_char *dat, int length)
2311 {
2312 struct bgp_open bgpo;
2313 struct bgp_opt bgpopt;
2314 const u_char *opt;
2315 int i;
2316 char tokbuf[TOKBUFSIZE];
2317
2318 ND_TCHECK2(dat[0], BGP_OPEN_SIZE);
2319 memcpy(&bgpo, dat, BGP_OPEN_SIZE);
2320
2321 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version));
2322 ND_PRINT((ndo, "my AS %s, ",
2323 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas))));
2324 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime)));
2325 ND_PRINT((ndo, "ID %s", getname(ndo, (u_char *)&bgpo.bgpo_id)));
2326 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen));
2327
2328 /* some little sanity checking */
2329 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE)
2330 return;
2331
2332 /* ugly! */
2333 opt = &((const struct bgp_open *)dat)->bgpo_optlen;
2334 opt++;
2335
2336 i = 0;
2337 while (i < bgpo.bgpo_optlen) {
2338 ND_TCHECK2(opt[i], BGP_OPT_SIZE);
2339 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE);
2340 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
2341 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len));
2342 break;
2343 }
2344
2345 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u",
2346 tok2strbuf(bgp_opt_values,"Unknown",
2347 bgpopt.bgpopt_type,
2348 tokbuf, sizeof(tokbuf)),
2349 bgpopt.bgpopt_type,
2350 bgpopt.bgpopt_len));
2351
2352 /* now let's decode the options we know*/
2353 switch(bgpopt.bgpopt_type) {
2354
2355 case BGP_OPT_CAP:
2356 bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE],
2357 bgpopt.bgpopt_len);
2358 break;
2359
2360 case BGP_OPT_AUTH:
2361 default:
2362 ND_PRINT((ndo, "\n\t no decoder for option %u",
2363 bgpopt.bgpopt_type));
2364 break;
2365 }
2366 i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
2367 }
2368 return;
2369 trunc:
2370 ND_PRINT((ndo, "[|BGP]"));
2371 }
2372
2373 static void
2374 bgp_update_print(netdissect_options *ndo,
2375 const u_char *dat, int length)
2376 {
2377 struct bgp bgp;
2378 const u_char *p;
2379 int withdrawn_routes_len;
2380 int len;
2381 int i;
2382 char tokbuf[TOKBUFSIZE];
2383 #ifndef INET6
2384 char buf[MAXHOSTNAMELEN + 100];
2385 int wpfx;
2386 #endif
2387
2388 ND_TCHECK2(dat[0], BGP_SIZE);
2389 if (length < BGP_SIZE)
2390 goto trunc;
2391 memcpy(&bgp, dat, BGP_SIZE);
2392 p = dat + BGP_SIZE; /*XXX*/
2393 length -= BGP_SIZE;
2394
2395 /* Unfeasible routes */
2396 ND_TCHECK2(p[0], 2);
2397 if (length < 2)
2398 goto trunc;
2399 withdrawn_routes_len = EXTRACT_16BITS(p);
2400 p += 2;
2401 length -= 2;
2402 if (withdrawn_routes_len) {
2403 /*
2404 * Without keeping state from the original NLRI message,
2405 * it's not possible to tell if this a v4 or v6 route,
2406 * so only try to decode it if we're not v6 enabled.
2407 */
2408 ND_TCHECK2(p[0], withdrawn_routes_len);
2409 if (length < withdrawn_routes_len)
2410 goto trunc;
2411 #ifdef INET6
2412 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len));
2413 p += withdrawn_routes_len;
2414 length -= withdrawn_routes_len;
2415 #else
2416 if (withdrawn_routes_len < 2)
2417 goto trunc;
2418 length -= 2;
2419 withdrawn_routes_len -= 2;
2420
2421
2422 ND_PRINT((ndo, "\n\t Withdrawn routes:"));
2423
2424 while(withdrawn_routes_len > 0) {
2425 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
2426 if (wpfx == -1) {
2427 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2428 break;
2429 } else if (wpfx == -2)
2430 goto trunc;
2431 else if (wpfx == -3)
2432 goto trunc; /* bytes left, but not enough */
2433 else {
2434 ND_PRINT((ndo, "\n\t %s", buf));
2435 p += wpfx;
2436 length -= wpfx;
2437 withdrawn_routes_len -= wpfx;
2438 }
2439 }
2440 #endif
2441 }
2442
2443 ND_TCHECK2(p[0], 2);
2444 if (length < 2)
2445 goto trunc;
2446 len = EXTRACT_16BITS(p);
2447 p += 2;
2448 length -= 2;
2449
2450 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2451 /* No withdrawn routes, no path attributes, no NLRI */
2452 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2453 return;
2454 }
2455
2456 if (len) {
2457 /* do something more useful!*/
2458 while (len) {
2459 int aflags, atype, alenlen, alen;
2460
2461 ND_TCHECK2(p[0], 2);
2462 if (len < 2)
2463 goto trunc;
2464 if (length < 2)
2465 goto trunc;
2466 aflags = *p;
2467 atype = *(p + 1);
2468 p += 2;
2469 len -= 2;
2470 length -= 2;
2471 alenlen = bgp_attr_lenlen(aflags, p);
2472 ND_TCHECK2(p[0], alenlen);
2473 if (len < alenlen)
2474 goto trunc;
2475 if (length < alenlen)
2476 goto trunc;
2477 alen = bgp_attr_len(aflags, p);
2478 p += alenlen;
2479 len -= alenlen;
2480 length -= alenlen;
2481
2482 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2483 tok2strbuf(bgp_attr_values, "Unknown Attribute",
2484 atype,
2485 tokbuf, sizeof(tokbuf)),
2486 atype,
2487 alen));
2488
2489 if (aflags) {
2490 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2491 aflags & 0x80 ? "O" : "",
2492 aflags & 0x40 ? "T" : "",
2493 aflags & 0x20 ? "P" : "",
2494 aflags & 0x10 ? "E" : ""));
2495 if (aflags & 0xf)
2496 ND_PRINT((ndo, "+%x", aflags & 0xf));
2497 ND_PRINT((ndo, "]: "));
2498 }
2499 if (len < alen)
2500 goto trunc;
2501 if (length < alen)
2502 goto trunc;
2503 if (!bgp_attr_print(ndo, atype, p, alen))
2504 goto trunc;
2505 p += alen;
2506 len -= alen;
2507 length -= alen;
2508 }
2509 }
2510
2511 if (length) {
2512 /*
2513 * XXX - what if they're using the "Advertisement of
2514 * Multiple Paths in BGP" feature:
2515 *
2516 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/
2517 *
2518 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06
2519 */
2520 ND_PRINT((ndo, "\n\t Updated routes:"));
2521 while (length) {
2522 char buf[MAXHOSTNAMELEN + 100];
2523 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2524 if (i == -1) {
2525 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2526 break;
2527 } else if (i == -2)
2528 goto trunc;
2529 else if (i == -3)
2530 goto trunc; /* bytes left, but not enough */
2531 else {
2532 ND_PRINT((ndo, "\n\t %s", buf));
2533 p += i;
2534 length -= i;
2535 }
2536 }
2537 }
2538 return;
2539 trunc:
2540 ND_PRINT((ndo, "[|BGP]"));
2541 }
2542
2543 static void
2544 bgp_notification_print(netdissect_options *ndo,
2545 const u_char *dat, int length)
2546 {
2547 struct bgp_notification bgpn;
2548 const u_char *tptr;
2549 char tokbuf[TOKBUFSIZE];
2550 char tokbuf2[TOKBUFSIZE];
2551
2552 ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
2553 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
2554
2555 /* some little sanity checking */
2556 if (length<BGP_NOTIFICATION_SIZE)
2557 return;
2558
2559 ND_PRINT((ndo, ", %s (%u)",
2560 tok2strbuf(bgp_notify_major_values, "Unknown Error",
2561 bgpn.bgpn_major, tokbuf, sizeof(tokbuf)),
2562 bgpn.bgpn_major));
2563
2564 switch (bgpn.bgpn_major) {
2565
2566 case BGP_NOTIFY_MAJOR_MSG:
2567 ND_PRINT((ndo, ", subcode %s (%u)",
2568 tok2strbuf(bgp_notify_minor_msg_values, "Unknown",
2569 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
2570 bgpn.bgpn_minor));
2571 break;
2572 case BGP_NOTIFY_MAJOR_OPEN:
2573 ND_PRINT((ndo, ", subcode %s (%u)",
2574 tok2strbuf(bgp_notify_minor_open_values, "Unknown",
2575 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
2576 bgpn.bgpn_minor));
2577 break;
2578 case BGP_NOTIFY_MAJOR_UPDATE:
2579 ND_PRINT((ndo, ", subcode %s (%u)",
2580 tok2strbuf(bgp_notify_minor_update_values, "Unknown",
2581 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
2582 bgpn.bgpn_minor));
2583 break;
2584 case BGP_NOTIFY_MAJOR_CAP:
2585 ND_PRINT((ndo, " subcode %s (%u)",
2586 tok2strbuf(bgp_notify_minor_cap_values, "Unknown",
2587 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
2588 bgpn.bgpn_minor));
2589 case BGP_NOTIFY_MAJOR_CEASE:
2590 ND_PRINT((ndo, ", subcode %s (%u)",
2591 tok2strbuf(bgp_notify_minor_cease_values, "Unknown",
2592 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
2593 bgpn.bgpn_minor));
2594
2595 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2596 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2597 */
2598 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2599 tptr = dat + BGP_NOTIFICATION_SIZE;
2600 ND_TCHECK2(*tptr, 7);
2601 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2602 tok2strbuf(af_values, "Unknown",
2603 EXTRACT_16BITS(tptr), tokbuf, sizeof(tokbuf)),
2604 EXTRACT_16BITS(tptr),
2605 tok2strbuf(bgp_safi_values, "Unknown", *(tptr+2),
2606 tokbuf2, sizeof(tokbuf)),
2607 *(tptr+2),
2608 EXTRACT_32BITS(tptr+3)));
2609 }
2610 break;
2611 default:
2612 break;
2613 }
2614
2615 return;
2616 trunc:
2617 ND_PRINT((ndo, "[|BGP]"));
2618 }
2619
2620 static void
2621 bgp_route_refresh_print(netdissect_options *ndo,
2622 const u_char *pptr, int len) {
2623
2624 const struct bgp_route_refresh *bgp_route_refresh_header;
2625 char tokbuf[TOKBUFSIZE];
2626 char tokbuf2[TOKBUFSIZE];
2627
2628 ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE);
2629
2630 /* some little sanity checking */
2631 if (len<BGP_ROUTE_REFRESH_SIZE)
2632 return;
2633
2634 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2635
2636 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)",
2637 tok2strbuf(af_values,"Unknown",
2638 /* this stinks but the compiler pads the structure
2639 * weird */
2640 EXTRACT_16BITS(&bgp_route_refresh_header->afi),
2641 tokbuf, sizeof(tokbuf)),
2642 EXTRACT_16BITS(&bgp_route_refresh_header->afi),
2643 tok2strbuf(bgp_safi_values,"Unknown",
2644 bgp_route_refresh_header->safi,
2645 tokbuf2, sizeof(tokbuf2)),
2646 bgp_route_refresh_header->safi));
2647
2648 if (ndo->ndo_vflag > 1) {
2649 ND_TCHECK2(*pptr, len);
2650 print_unknown_data(ndo, pptr, "\n\t ", len);
2651 }
2652
2653 return;
2654 trunc:
2655 ND_PRINT((ndo, "[|BGP]"));
2656 }
2657
2658 static int
2659 bgp_header_print(netdissect_options *ndo,
2660 const u_char *dat, int length)
2661 {
2662 struct bgp bgp;
2663 char tokbuf[TOKBUFSIZE];
2664
2665 ND_TCHECK2(dat[0], BGP_SIZE);
2666 memcpy(&bgp, dat, BGP_SIZE);
2667 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2668 tok2strbuf(bgp_msg_values, "Unknown", bgp.bgp_type,
2669 tokbuf, sizeof(tokbuf)),
2670 bgp.bgp_type,
2671 length));
2672
2673 switch (bgp.bgp_type) {
2674 case BGP_OPEN:
2675 bgp_open_print(ndo, dat, length);
2676 break;
2677 case BGP_UPDATE:
2678 bgp_update_print(ndo, dat, length);
2679 break;
2680 case BGP_NOTIFICATION:
2681 bgp_notification_print(ndo, dat, length);
2682 break;
2683 case BGP_KEEPALIVE:
2684 break;
2685 case BGP_ROUTE_REFRESH:
2686 bgp_route_refresh_print(ndo, dat, length);
2687 break;
2688 default:
2689 /* we have no decoder for the BGP message */
2690 ND_TCHECK2(*dat, length);
2691 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type));
2692 print_unknown_data(ndo, dat, "\n\t ", length);
2693 break;
2694 }
2695 return 1;
2696 trunc:
2697 ND_PRINT((ndo, "[|BGP]"));
2698 return 0;
2699 }
2700
2701 void
2702 bgp_print(netdissect_options *ndo,
2703 const u_char *dat, int length)
2704 {
2705 const u_char *p;
2706 const u_char *ep;
2707 const u_char *start;
2708 const u_char marker[] = {
2709 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2710 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2711 };
2712 struct bgp bgp;
2713 uint16_t hlen;
2714 char tokbuf[TOKBUFSIZE];
2715
2716 ep = dat + length;
2717 if (ndo->ndo_snapend < dat + length)
2718 ep = ndo->ndo_snapend;
2719
2720 ND_PRINT((ndo, ": BGP"));
2721
2722 if (ndo->ndo_vflag < 1) /* lets be less chatty */
2723 return;
2724
2725 p = dat;
2726 start = p;
2727 while (p < ep) {
2728 if (!ND_TTEST2(p[0], 1))
2729 break;
2730 if (p[0] != 0xff) {
2731 p++;
2732 continue;
2733 }
2734
2735 if (!ND_TTEST2(p[0], sizeof(marker)))
2736 break;
2737 if (memcmp(p, marker, sizeof(marker)) != 0) {
2738 p++;
2739 continue;
2740 }
2741
2742 /* found BGP header */
2743 ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/
2744 memcpy(&bgp, p, BGP_SIZE);
2745
2746 if (start != p)
2747 ND_PRINT((ndo, " [|BGP]"));
2748
2749 hlen = ntohs(bgp.bgp_len);
2750 if (hlen < BGP_SIZE) {
2751 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
2752 BGP_SIZE));
2753 break;
2754 }
2755
2756 if (ND_TTEST2(p[0], hlen)) {
2757 if (!bgp_header_print(ndo, p, hlen))
2758 return;
2759 p += hlen;
2760 start = p;
2761 } else {
2762 ND_PRINT((ndo, "\n[|BGP %s]",
2763 tok2strbuf(bgp_msg_values,
2764 "Unknown Message Type",
2765 bgp.bgp_type,
2766 tokbuf, sizeof(tokbuf))));
2767 break;
2768 }
2769 }
2770
2771 return;
2772
2773 trunc:
2774 ND_PRINT((ndo, " [|BGP]"));
2775 }
2776
2777 /*
2778 * Local Variables:
2779 * c-style: whitesmith
2780 * c-basic-offset: 4
2781 * End:
2782 */
[mirror] the TCPdump network dissector