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Handle very large -f files by rejecting them.
[tcpdump] / print-bgp.c
1 /*
2 * Copyright (C) 1999 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * Extensively modified by Hannes Gredler (hannes@gredler.at) for more
30 * complete BGP support.
31 */
32
33 /* \summary: Border Gateway Protocol (BGP) printer */
34
35 #ifdef HAVE_CONFIG_H
36 #include "config.h"
37 #endif
38
39 #include <netdissect-stdinc.h>
40
41 #include <stdio.h>
42 #include <string.h>
43
44 #include "netdissect.h"
45 #include "addrtoname.h"
46 #include "extract.h"
47 #include "af.h"
48 #include "l2vpn.h"
49
50 static const char tstr[] = "[|BGP]";
51
52 struct bgp {
53 uint8_t bgp_marker[16];
54 uint16_t bgp_len;
55 uint8_t bgp_type;
56 };
57 #define BGP_SIZE 19 /* unaligned */
58
59 #define BGP_OPEN 1
60 #define BGP_UPDATE 2
61 #define BGP_NOTIFICATION 3
62 #define BGP_KEEPALIVE 4
63 #define BGP_ROUTE_REFRESH 5
64
65 static const struct tok bgp_msg_values[] = {
66 { BGP_OPEN, "Open"},
67 { BGP_UPDATE, "Update"},
68 { BGP_NOTIFICATION, "Notification"},
69 { BGP_KEEPALIVE, "Keepalive"},
70 { BGP_ROUTE_REFRESH, "Route Refresh"},
71 { 0, NULL}
72 };
73
74 struct bgp_open {
75 uint8_t bgpo_marker[16];
76 uint16_t bgpo_len;
77 uint8_t bgpo_type;
78 uint8_t bgpo_version;
79 uint16_t bgpo_myas;
80 uint16_t bgpo_holdtime;
81 uint32_t bgpo_id;
82 uint8_t bgpo_optlen;
83 /* options should follow */
84 };
85 #define BGP_OPEN_SIZE 29 /* unaligned */
86
87 struct bgp_opt {
88 uint8_t bgpopt_type;
89 uint8_t bgpopt_len;
90 /* variable length */
91 };
92 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
93 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
94
95 struct bgp_notification {
96 uint8_t bgpn_marker[16];
97 uint16_t bgpn_len;
98 uint8_t bgpn_type;
99 uint8_t bgpn_major;
100 uint8_t bgpn_minor;
101 };
102 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
103
104 struct bgp_route_refresh {
105 uint8_t bgp_marker[16];
106 uint16_t len;
107 uint8_t type;
108 uint8_t afi[2]; /* the compiler messes this structure up */
109 uint8_t res; /* when doing misaligned sequences of int8 and int16 */
110 uint8_t safi; /* afi should be int16 - so we have to access it using */
111 }; /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh) */
112 #define BGP_ROUTE_REFRESH_SIZE 23
113
114 #define bgp_attr_lenlen(flags, p) \
115 (((flags) & 0x10) ? 2 : 1)
116 #define bgp_attr_len(flags, p) \
117 (((flags) & 0x10) ? EXTRACT_16BITS(p) : *(p))
118
119 #define BGPTYPE_ORIGIN 1
120 #define BGPTYPE_AS_PATH 2
121 #define BGPTYPE_NEXT_HOP 3
122 #define BGPTYPE_MULTI_EXIT_DISC 4
123 #define BGPTYPE_LOCAL_PREF 5
124 #define BGPTYPE_ATOMIC_AGGREGATE 6
125 #define BGPTYPE_AGGREGATOR 7
126 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
127 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */
128 #define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */
129 #define BGPTYPE_DPA 11 /* deprecated, draft-ietf-idr-bgp-dpa */
130 #define BGPTYPE_ADVERTISERS 12 /* deprecated RFC1863 */
131 #define BGPTYPE_RCID_PATH 13 /* deprecated RFC1863 */
132 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */
133 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */
134 #define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */
135 #define BGPTYPE_AS4_PATH 17 /* RFC6793 */
136 #define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */
137 #define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */
138 #define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */
139 #define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */
140 #define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */
141 #define BGPTYPE_AIGP 26 /* RFC7311 */
142 #define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */
143 #define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */
144 #define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */
145 #define BGPTYPE_ATTR_SET 128 /* RFC6368 */
146
147 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
148
149 static const struct tok bgp_attr_values[] = {
150 { BGPTYPE_ORIGIN, "Origin"},
151 { BGPTYPE_AS_PATH, "AS Path"},
152 { BGPTYPE_AS4_PATH, "AS4 Path"},
153 { BGPTYPE_NEXT_HOP, "Next Hop"},
154 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
155 { BGPTYPE_LOCAL_PREF, "Local Preference"},
156 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
157 { BGPTYPE_AGGREGATOR, "Aggregator"},
158 { BGPTYPE_AGGREGATOR4, "Aggregator4"},
159 { BGPTYPE_COMMUNITIES, "Community"},
160 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
161 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
162 { BGPTYPE_DPA, "DPA"},
163 { BGPTYPE_ADVERTISERS, "Advertisers"},
164 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"},
165 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
166 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
167 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
168 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
169 { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"},
170 { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"},
171 { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
172 { BGPTYPE_AIGP, "Accumulated IGP Metric"},
173 { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
174 { BGPTYPE_ENTROPY_LABEL, "Entropy Label"},
175 { BGPTYPE_LARGE_COMMUNITY, "Large Community"},
176 { BGPTYPE_ATTR_SET, "Attribute Set"},
177 { 255, "Reserved for development"},
178 { 0, NULL}
179 };
180
181 #define BGP_AS_SET 1
182 #define BGP_AS_SEQUENCE 2
183 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
184 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
185
186 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
187 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
188
189 static const struct tok bgp_as_path_segment_open_values[] = {
190 { BGP_AS_SEQUENCE, ""},
191 { BGP_AS_SET, "{ "},
192 { BGP_CONFED_AS_SEQUENCE, "( "},
193 { BGP_CONFED_AS_SET, "({ "},
194 { 0, NULL}
195 };
196
197 static const struct tok bgp_as_path_segment_close_values[] = {
198 { BGP_AS_SEQUENCE, ""},
199 { BGP_AS_SET, "}"},
200 { BGP_CONFED_AS_SEQUENCE, ")"},
201 { BGP_CONFED_AS_SET, "})"},
202 { 0, NULL}
203 };
204
205 #define BGP_OPT_AUTH 1
206 #define BGP_OPT_CAP 2
207
208 static const struct tok bgp_opt_values[] = {
209 { BGP_OPT_AUTH, "Authentication Information"},
210 { BGP_OPT_CAP, "Capabilities Advertisement"},
211 { 0, NULL}
212 };
213
214 #define BGP_CAPCODE_MP 1 /* RFC2858 */
215 #define BGP_CAPCODE_RR 2 /* RFC2918 */
216 #define BGP_CAPCODE_ORF 3 /* RFC5291 */
217 #define BGP_CAPCODE_MR 4 /* RFC3107 */
218 #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */
219 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */
220 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
221 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
222 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
223 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
224 #define BGP_CAPCODE_ENH_RR 70 /* draft-keyur-bgp-enhanced-route-refresh */
225 #define BGP_CAPCODE_RR_CISCO 128
226
227 static const struct tok bgp_capcode_values[] = {
228 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
229 { BGP_CAPCODE_RR, "Route Refresh"},
230 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
231 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
232 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
233 { BGP_CAPCODE_RESTART, "Graceful Restart"},
234 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
235 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
236 { BGP_CAPCODE_MULTISESS, "Multisession BGP"},
237 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
238 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
239 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
240 { 0, NULL}
241 };
242
243 #define BGP_NOTIFY_MAJOR_MSG 1
244 #define BGP_NOTIFY_MAJOR_OPEN 2
245 #define BGP_NOTIFY_MAJOR_UPDATE 3
246 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
247 #define BGP_NOTIFY_MAJOR_FSM 5
248 #define BGP_NOTIFY_MAJOR_CEASE 6
249 #define BGP_NOTIFY_MAJOR_CAP 7
250
251 static const struct tok bgp_notify_major_values[] = {
252 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
253 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
254 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
255 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
256 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
257 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
258 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"},
259 { 0, NULL}
260 };
261
262 /* draft-ietf-idr-cease-subcode-02 */
263 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
264 static const struct tok bgp_notify_minor_cease_values[] = {
265 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
266 { 2, "Administratively Shutdown"},
267 { 3, "Peer Unconfigured"},
268 { 4, "Administratively Reset"},
269 { 5, "Connection Rejected"},
270 { 6, "Other Configuration Change"},
271 { 7, "Connection Collision Resolution"},
272 { 0, NULL}
273 };
274
275 static const struct tok bgp_notify_minor_msg_values[] = {
276 { 1, "Connection Not Synchronized"},
277 { 2, "Bad Message Length"},
278 { 3, "Bad Message Type"},
279 { 0, NULL}
280 };
281
282 static const struct tok bgp_notify_minor_open_values[] = {
283 { 1, "Unsupported Version Number"},
284 { 2, "Bad Peer AS"},
285 { 3, "Bad BGP Identifier"},
286 { 4, "Unsupported Optional Parameter"},
287 { 5, "Authentication Failure"},
288 { 6, "Unacceptable Hold Time"},
289 { 7, "Capability Message Error"},
290 { 0, NULL}
291 };
292
293 static const struct tok bgp_notify_minor_update_values[] = {
294 { 1, "Malformed Attribute List"},
295 { 2, "Unrecognized Well-known Attribute"},
296 { 3, "Missing Well-known Attribute"},
297 { 4, "Attribute Flags Error"},
298 { 5, "Attribute Length Error"},
299 { 6, "Invalid ORIGIN Attribute"},
300 { 7, "AS Routing Loop"},
301 { 8, "Invalid NEXT_HOP Attribute"},
302 { 9, "Optional Attribute Error"},
303 { 10, "Invalid Network Field"},
304 { 11, "Malformed AS_PATH"},
305 { 0, NULL}
306 };
307
308 static const struct tok bgp_notify_minor_fsm_values[] = {
309 { 1, "In OpenSent State"},
310 { 2, "In OpenConfirm State"},
311 { 3, "In Established State"},
312 { 0, NULL }
313 };
314
315 static const struct tok bgp_notify_minor_cap_values[] = {
316 { 1, "Invalid Action Value" },
317 { 2, "Invalid Capability Length" },
318 { 3, "Malformed Capability Value" },
319 { 4, "Unsupported Capability Code" },
320 { 0, NULL }
321 };
322
323 static const struct tok bgp_origin_values[] = {
324 { 0, "IGP"},
325 { 1, "EGP"},
326 { 2, "Incomplete"},
327 { 0, NULL}
328 };
329
330 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1
331 #define BGP_PMSI_TUNNEL_LDP_P2MP 2
332 #define BGP_PMSI_TUNNEL_PIM_SSM 3
333 #define BGP_PMSI_TUNNEL_PIM_SM 4
334 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5
335 #define BGP_PMSI_TUNNEL_INGRESS 6
336 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7
337
338 static const struct tok bgp_pmsi_tunnel_values[] = {
339 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
340 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
341 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
342 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
343 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
344 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
345 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
346 { 0, NULL}
347 };
348
349 static const struct tok bgp_pmsi_flag_values[] = {
350 { 0x01, "Leaf Information required"},
351 { 0, NULL}
352 };
353
354 #define BGP_AIGP_TLV 1
355
356 static const struct tok bgp_aigp_values[] = {
357 { BGP_AIGP_TLV, "AIGP"},
358 { 0, NULL}
359 };
360
361 /* Subsequent address family identifier, RFC2283 section 7 */
362 #define SAFNUM_RES 0
363 #define SAFNUM_UNICAST 1
364 #define SAFNUM_MULTICAST 2
365 #define SAFNUM_UNIMULTICAST 3 /* deprecated now */
366 /* labeled BGP RFC3107 */
367 #define SAFNUM_LABUNICAST 4
368 /* RFC6514 */
369 #define SAFNUM_MULTICAST_VPN 5
370 /* draft-nalawade-kapoor-tunnel-safi */
371 #define SAFNUM_TUNNEL 64
372 /* RFC4761 */
373 #define SAFNUM_VPLS 65
374 /* RFC6037 */
375 #define SAFNUM_MDT 66
376 /* RFC4364 */
377 #define SAFNUM_VPNUNICAST 128
378 /* RFC6513 */
379 #define SAFNUM_VPNMULTICAST 129
380 #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */
381 /* RFC4684 */
382 #define SAFNUM_RT_ROUTING_INFO 132
383
384 #define BGP_VPN_RD_LEN 8
385
386 static const struct tok bgp_safi_values[] = {
387 { SAFNUM_RES, "Reserved"},
388 { SAFNUM_UNICAST, "Unicast"},
389 { SAFNUM_MULTICAST, "Multicast"},
390 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
391 { SAFNUM_LABUNICAST, "labeled Unicast"},
392 { SAFNUM_TUNNEL, "Tunnel"},
393 { SAFNUM_VPLS, "VPLS"},
394 { SAFNUM_MDT, "MDT"},
395 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
396 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
397 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
398 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
399 { SAFNUM_MULTICAST_VPN, "Multicast VPN"},
400 { 0, NULL }
401 };
402
403 /* well-known community */
404 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
405 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
406 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
407
408 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */
409 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
410 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
411 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
412 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
413 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
414 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
415 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
416 /* rfc2547 bgp-mpls-vpns */
417 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
418 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatability */
419 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatability */
420 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatability */
421
422 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
423 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatability */
424
425 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
426 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatability */
427
428 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
429
430 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
431 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
432 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
433 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */
434
435 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */
436 #define BGP_EXT_COM_EIGRP_GEN 0x8800
437 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801
438 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
439 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803
440 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804
441 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
442
443 static const struct tok bgp_extd_comm_flag_values[] = {
444 { 0x8000, "vendor-specific"},
445 { 0x4000, "non-transitive"},
446 { 0, NULL},
447 };
448
449 static const struct tok bgp_extd_comm_subtype_values[] = {
450 { BGP_EXT_COM_RT_0, "target"},
451 { BGP_EXT_COM_RT_1, "target"},
452 { BGP_EXT_COM_RT_2, "target"},
453 { BGP_EXT_COM_RO_0, "origin"},
454 { BGP_EXT_COM_RO_1, "origin"},
455 { BGP_EXT_COM_RO_2, "origin"},
456 { BGP_EXT_COM_LINKBAND, "link-BW"},
457 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
458 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
459 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
460 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
461 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
462 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
463 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
464 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
465 { BGP_EXT_COM_L2INFO, "layer2-info"},
466 { BGP_EXT_COM_EIGRP_GEN , "eigrp-general-route (flag, tag)" },
467 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY , "eigrp-route-metric (AS, delay)" },
468 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW , "eigrp-route-metric (reliability, nexthop, bandwidth)" },
469 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU , "eigrp-route-metric (load, MTU)" },
470 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID , "eigrp-external-route (remote-AS, remote-ID)" },
471 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC , "eigrp-external-route (remote-proto, remote-metric)" },
472 { BGP_EXT_COM_SOURCE_AS, "source-AS" },
473 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
474 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
475 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
476 { 0, NULL},
477 };
478
479 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
480 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
481 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
482 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
483 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
484 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
485 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
486 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
487
488 static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
489 { BGP_OSPF_RTYPE_RTR, "Router" },
490 { BGP_OSPF_RTYPE_NET, "Network" },
491 { BGP_OSPF_RTYPE_SUM, "Summary" },
492 { BGP_OSPF_RTYPE_EXT, "External" },
493 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
494 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
495 { 0, NULL },
496 };
497
498 /* ADD-PATH Send/Receive field values */
499 static const struct tok bgp_add_path_recvsend[] = {
500 { 1, "Receive" },
501 { 2, "Send" },
502 { 3, "Both" },
503 { 0, NULL },
504 };
505
506 static char astostr[20];
507
508 /*
509 * as_printf
510 *
511 * Convert an AS number into a string and return string pointer.
512 *
513 * Depending on bflag is set or not, AS number is converted into ASDOT notation
514 * or plain number notation.
515 *
516 */
517 static char *
518 as_printf(netdissect_options *ndo,
519 char *str, int size, u_int asnum)
520 {
521 if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
522 snprintf(str, size, "%u", asnum);
523 } else {
524 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
525 }
526 return str;
527 }
528
529 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
530
531 int
532 decode_prefix4(netdissect_options *ndo,
533 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
534 {
535 struct in_addr addr;
536 u_int plen, plenbytes;
537
538 ND_TCHECK(pptr[0]);
539 ITEMCHECK(1);
540 plen = pptr[0];
541 if (32 < plen)
542 return -1;
543 itemlen -= 1;
544
545 memset(&addr, 0, sizeof(addr));
546 plenbytes = (plen + 7) / 8;
547 ND_TCHECK2(pptr[1], plenbytes);
548 ITEMCHECK(plenbytes);
549 memcpy(&addr, &pptr[1], plenbytes);
550 if (plen % 8) {
551 ((u_char *)&addr)[plenbytes - 1] &=
552 ((0xff00 >> (plen % 8)) & 0xff);
553 }
554 snprintf(buf, buflen, "%s/%d", ipaddr_string(ndo, &addr), plen);
555 return 1 + plenbytes;
556
557 trunc:
558 return -2;
559
560 badtlv:
561 return -3;
562 }
563
564 static int
565 decode_labeled_prefix4(netdissect_options *ndo,
566 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
567 {
568 struct in_addr addr;
569 u_int plen, plenbytes;
570
571 /* prefix length and label = 4 bytes */
572 ND_TCHECK2(pptr[0], 4);
573 ITEMCHECK(4);
574 plen = pptr[0]; /* get prefix length */
575
576 /* this is one of the weirdnesses of rfc3107
577 the label length (actually the label + COS bits)
578 is added to the prefix length;
579 we also do only read out just one label -
580 there is no real application for advertisement of
581 stacked labels in a single BGP message
582 */
583
584 if (24 > plen)
585 return -1;
586
587 plen-=24; /* adjust prefixlen - labellength */
588
589 if (32 < plen)
590 return -1;
591 itemlen -= 4;
592
593 memset(&addr, 0, sizeof(addr));
594 plenbytes = (plen + 7) / 8;
595 ND_TCHECK2(pptr[4], plenbytes);
596 ITEMCHECK(plenbytes);
597 memcpy(&addr, &pptr[4], plenbytes);
598 if (plen % 8) {
599 ((u_char *)&addr)[plenbytes - 1] &=
600 ((0xff00 >> (plen % 8)) & 0xff);
601 }
602 /* the label may get offsetted by 4 bits so lets shift it right */
603 snprintf(buf, buflen, "%s/%d, label:%u %s",
604 ipaddr_string(ndo, &addr),
605 plen,
606 EXTRACT_24BITS(pptr+1)>>4,
607 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
608
609 return 4 + plenbytes;
610
611 trunc:
612 return -2;
613
614 badtlv:
615 return -3;
616 }
617
618 /*
619 * bgp_vpn_ip_print
620 *
621 * print an ipv4 or ipv6 address into a buffer dependend on address length.
622 */
623 static char *
624 bgp_vpn_ip_print(netdissect_options *ndo,
625 const u_char *pptr, u_int addr_length)
626 {
627
628 /* worst case string is s fully formatted v6 address */
629 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
630 char *pos = addr;
631
632 switch(addr_length) {
633 case (sizeof(struct in_addr) << 3): /* 32 */
634 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
635 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
636 break;
637 case (sizeof(struct in6_addr) << 3): /* 128 */
638 ND_TCHECK2(pptr[0], sizeof(struct in6_addr));
639 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
640 break;
641 default:
642 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
643 break;
644 }
645 pos += strlen(pos);
646
647 trunc:
648 *(pos) = '\0';
649 return (addr);
650 }
651
652 /*
653 * bgp_vpn_sg_print
654 *
655 * print an multicast s,g entry into a buffer.
656 * the s,g entry is encoded like this.
657 *
658 * +-----------------------------------+
659 * | Multicast Source Length (1 octet) |
660 * +-----------------------------------+
661 * | Multicast Source (Variable) |
662 * +-----------------------------------+
663 * | Multicast Group Length (1 octet) |
664 * +-----------------------------------+
665 * | Multicast Group (Variable) |
666 * +-----------------------------------+
667 *
668 * return the number of bytes read from the wire.
669 */
670 static int
671 bgp_vpn_sg_print(netdissect_options *ndo,
672 const u_char *pptr, char *buf, u_int buflen)
673 {
674 uint8_t addr_length;
675 u_int total_length, offset;
676
677 total_length = 0;
678
679 /* Source address length, encoded in bits */
680 ND_TCHECK2(pptr[0], 1);
681 addr_length = *pptr++;
682
683 /* Source address */
684 ND_TCHECK2(pptr[0], (addr_length >> 3));
685 total_length += (addr_length >> 3) + 1;
686 offset = strlen(buf);
687 if (addr_length) {
688 snprintf(buf + offset, buflen - offset, ", Source %s",
689 bgp_vpn_ip_print(ndo, pptr, addr_length));
690 pptr += (addr_length >> 3);
691 }
692
693 /* Group address length, encoded in bits */
694 ND_TCHECK2(pptr[0], 1);
695 addr_length = *pptr++;
696
697 /* Group address */
698 ND_TCHECK2(pptr[0], (addr_length >> 3));
699 total_length += (addr_length >> 3) + 1;
700 offset = strlen(buf);
701 if (addr_length) {
702 snprintf(buf + offset, buflen - offset, ", Group %s",
703 bgp_vpn_ip_print(ndo, pptr, addr_length));
704 pptr += (addr_length >> 3);
705 }
706
707 trunc:
708 return (total_length);
709 }
710
711 /* RDs and RTs share the same semantics
712 * we use bgp_vpn_rd_print for
713 * printing route targets inside a NLRI */
714 char *
715 bgp_vpn_rd_print(netdissect_options *ndo,
716 const u_char *pptr)
717 {
718 /* allocate space for the largest possible string */
719 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
720 char *pos = rd;
721
722 /* ok lets load the RD format */
723 switch (EXTRACT_16BITS(pptr)) {
724
725 /* 2-byte-AS:number fmt*/
726 case 0:
727 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
728 EXTRACT_16BITS(pptr+2),
729 EXTRACT_32BITS(pptr+4),
730 *(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7));
731 break;
732 /* IP-address:AS fmt*/
733
734 case 1:
735 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
736 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6));
737 break;
738
739 /* 4-byte-AS:number fmt*/
740 case 2:
741 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
742 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+2)),
743 EXTRACT_16BITS(pptr+6), *(pptr+2), *(pptr+3), *(pptr+4),
744 *(pptr+5), EXTRACT_16BITS(pptr+6));
745 break;
746 default:
747 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
748 break;
749 }
750 pos += strlen(pos);
751 *(pos) = '\0';
752 return (rd);
753 }
754
755 static int
756 decode_rt_routing_info(netdissect_options *ndo,
757 const u_char *pptr, char *buf, u_int buflen)
758 {
759 uint8_t route_target[8];
760 u_int plen;
761 char asbuf[sizeof(astostr)]; /* bgp_vpn_rd_print() overwrites astostr */
762
763 /* NLRI "prefix length" from RFC 2858 Section 4. */
764 ND_TCHECK(pptr[0]);
765 plen = pptr[0]; /* get prefix length */
766
767 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
768 * RFC 4684 Section 4 defines the layout of "origin AS" and "route
769 * target" fields inside the "prefix" depending on its length.
770 */
771 if (0 == plen) {
772 /* Without "origin AS", without "route target". */
773 snprintf(buf, buflen, "default route target");
774 return 1;
775 }
776
777 if (32 > plen)
778 return -1;
779
780 /* With at least "origin AS", possibly with "route target". */
781 ND_TCHECK_32BITS(pptr + 1);
782 as_printf(ndo, asbuf, sizeof(asbuf), EXTRACT_32BITS(pptr + 1));
783
784 plen-=32; /* adjust prefix length */
785
786 if (64 < plen)
787 return -1;
788
789 /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 }
790 * and gives the number of octets in the variable-length "route
791 * target" field inside this NLRI "prefix". Look for it.
792 */
793 memset(&route_target, 0, sizeof(route_target));
794 ND_TCHECK2(pptr[5], (plen + 7) / 8);
795 memcpy(&route_target, &pptr[5], (plen + 7) / 8);
796 /* Which specification says to do this? */
797 if (plen % 8) {
798 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
799 ((0xff00 >> (plen % 8)) & 0xff);
800 }
801 snprintf(buf, buflen, "origin AS: %s, route target %s",
802 asbuf,
803 bgp_vpn_rd_print(ndo, (u_char *)&route_target));
804
805 return 5 + (plen + 7) / 8;
806
807 trunc:
808 return -2;
809 }
810
811 static int
812 decode_labeled_vpn_prefix4(netdissect_options *ndo,
813 const u_char *pptr, char *buf, u_int buflen)
814 {
815 struct in_addr addr;
816 u_int plen;
817
818 ND_TCHECK(pptr[0]);
819 plen = pptr[0]; /* get prefix length */
820
821 if ((24+64) > plen)
822 return -1;
823
824 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
825
826 if (32 < plen)
827 return -1;
828
829 memset(&addr, 0, sizeof(addr));
830 ND_TCHECK2(pptr[12], (plen + 7) / 8);
831 memcpy(&addr, &pptr[12], (plen + 7) / 8);
832 if (plen % 8) {
833 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
834 ((0xff00 >> (plen % 8)) & 0xff);
835 }
836 /* the label may get offsetted by 4 bits so lets shift it right */
837 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
838 bgp_vpn_rd_print(ndo, pptr+4),
839 ipaddr_string(ndo, &addr),
840 plen,
841 EXTRACT_24BITS(pptr+1)>>4,
842 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
843
844 return 12 + (plen + 7) / 8;
845
846 trunc:
847 return -2;
848 }
849
850 /*
851 * +-------------------------------+
852 * | |
853 * | RD:IPv4-address (12 octets) |
854 * | |
855 * +-------------------------------+
856 * | MDT Group-address (4 octets) |
857 * +-------------------------------+
858 */
859
860 #define MDT_VPN_NLRI_LEN 16
861
862 static int
863 decode_mdt_vpn_nlri(netdissect_options *ndo,
864 const u_char *pptr, char *buf, u_int buflen)
865 {
866
867 const u_char *rd;
868 const u_char *vpn_ip;
869
870 ND_TCHECK(pptr[0]);
871
872 /* if the NLRI is not predefined length, quit.*/
873 if (*pptr != MDT_VPN_NLRI_LEN * 8)
874 return -1;
875 pptr++;
876
877 /* RD */
878 ND_TCHECK2(pptr[0], 8);
879 rd = pptr;
880 pptr+=8;
881
882 /* IPv4 address */
883 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
884 vpn_ip = pptr;
885 pptr+=sizeof(struct in_addr);
886
887 /* MDT Group Address */
888 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
889
890 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
891 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
892
893 return MDT_VPN_NLRI_LEN + 1;
894
895 trunc:
896
897 return -2;
898 }
899
900 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
901 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
902 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
903 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
904 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
905 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
906 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
907
908 static const struct tok bgp_multicast_vpn_route_type_values[] = {
909 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
910 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
911 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
912 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
913 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
914 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
915 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
916 { 0, NULL}
917 };
918
919 static int
920 decode_multicast_vpn(netdissect_options *ndo,
921 const u_char *pptr, char *buf, u_int buflen)
922 {
923 uint8_t route_type, route_length, addr_length, sg_length;
924 u_int offset;
925
926 ND_TCHECK2(pptr[0], 2);
927 route_type = *pptr++;
928 route_length = *pptr++;
929
930 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
931 tok2str(bgp_multicast_vpn_route_type_values,
932 "Unknown", route_type),
933 route_type, route_length);
934
935 switch(route_type) {
936 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
937 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
938 offset = strlen(buf);
939 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
940 bgp_vpn_rd_print(ndo, pptr),
941 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
942 (route_length - BGP_VPN_RD_LEN) << 3));
943 break;
944 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
945 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4);
946 offset = strlen(buf);
947 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
948 bgp_vpn_rd_print(ndo, pptr),
949 as_printf(ndo, astostr, sizeof(astostr),
950 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
951 break;
952
953 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
954 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
955 offset = strlen(buf);
956 snprintf(buf + offset, buflen - offset, ", RD: %s",
957 bgp_vpn_rd_print(ndo, pptr));
958 pptr += BGP_VPN_RD_LEN;
959
960 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
961 addr_length = route_length - sg_length;
962
963 ND_TCHECK2(pptr[0], addr_length);
964 offset = strlen(buf);
965 snprintf(buf + offset, buflen - offset, ", Originator %s",
966 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
967 break;
968
969 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
970 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
971 offset = strlen(buf);
972 snprintf(buf + offset, buflen - offset, ", RD: %s",
973 bgp_vpn_rd_print(ndo, pptr));
974 pptr += BGP_VPN_RD_LEN;
975
976 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
977 break;
978
979 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
980 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
981 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4);
982 offset = strlen(buf);
983 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
984 bgp_vpn_rd_print(ndo, pptr),
985 as_printf(ndo, astostr, sizeof(astostr),
986 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
987 pptr += BGP_VPN_RD_LEN + 4;
988
989 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
990 break;
991
992 /*
993 * no per route-type printing yet.
994 */
995 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
996 default:
997 break;
998 }
999
1000 return route_length + 2;
1001
1002 trunc:
1003 return -2;
1004 }
1005
1006 /*
1007 * As I remember, some versions of systems have an snprintf() that
1008 * returns -1 if the buffer would have overflowed. If the return
1009 * value is negative, set buflen to 0, to indicate that we've filled
1010 * the buffer up.
1011 *
1012 * If the return value is greater than buflen, that means that
1013 * the buffer would have overflowed; again, set buflen to 0 in
1014 * that case.
1015 */
1016 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1017 if (stringlen<0) \
1018 buflen=0; \
1019 else if ((u_int)stringlen>buflen) \
1020 buflen=0; \
1021 else { \
1022 buflen-=stringlen; \
1023 buf+=stringlen; \
1024 }
1025
1026 static int
1027 decode_labeled_vpn_l2(netdissect_options *ndo,
1028 const u_char *pptr, char *buf, u_int buflen)
1029 {
1030 int plen,tlen,stringlen,tlv_type,tlv_len,ttlv_len;
1031
1032 ND_TCHECK2(pptr[0], 2);
1033 plen=EXTRACT_16BITS(pptr);
1034 tlen=plen;
1035 pptr+=2;
1036 /* Old and new L2VPN NLRI share AFI/SAFI
1037 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1038 * and > 17 as old format. Complain for the middle case
1039 */
1040 if (plen==12) {
1041 /* assume AD-only with RD, BGPNH */
1042 ND_TCHECK2(pptr[0],12);
1043 buf[0]='\0';
1044 stringlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1045 bgp_vpn_rd_print(ndo, pptr),
1046 ipaddr_string(ndo, pptr+8)
1047 );
1048 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1049 pptr+=12;
1050 tlen-=12;
1051 return plen;
1052 } else if (plen>17) {
1053 /* assume old format */
1054 /* RD, ID, LBLKOFF, LBLBASE */
1055
1056 ND_TCHECK2(pptr[0],15);
1057 buf[0]='\0';
1058 stringlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1059 bgp_vpn_rd_print(ndo, pptr),
1060 EXTRACT_16BITS(pptr+8),
1061 EXTRACT_16BITS(pptr+10),
1062 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1063 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1064 pptr+=15;
1065 tlen-=15;
1066
1067 /* ok now the variable part - lets read out TLVs*/
1068 while (tlen>0) {
1069 if (tlen < 3)
1070 return -1;
1071 ND_TCHECK2(pptr[0], 3);
1072 tlv_type=*pptr++;
1073 tlv_len=EXTRACT_16BITS(pptr);
1074 ttlv_len=tlv_len;
1075 pptr+=2;
1076
1077 switch(tlv_type) {
1078 case 1:
1079 if (buflen!=0) {
1080 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1081 tlv_type,
1082 tlv_len);
1083 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1084 }
1085 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
1086 while (ttlv_len>0) {
1087 ND_TCHECK(pptr[0]);
1088 if (buflen!=0) {
1089 stringlen=snprintf(buf,buflen, "%02x",*pptr++);
1090 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1091 }
1092 ttlv_len--;
1093 }
1094 break;
1095 default:
1096 if (buflen!=0) {
1097 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1098 tlv_type,
1099 tlv_len);
1100 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1101 }
1102 break;
1103 }
1104 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
1105 }
1106 return plen+2;
1107
1108 } else {
1109 /* complain bitterly ? */
1110 /* fall through */
1111 goto trunc;
1112 }
1113
1114 trunc:
1115 return -2;
1116 }
1117
1118 int
1119 decode_prefix6(netdissect_options *ndo,
1120 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1121 {
1122 struct in6_addr addr;
1123 u_int plen, plenbytes;
1124
1125 ND_TCHECK(pd[0]);
1126 ITEMCHECK(1);
1127 plen = pd[0];
1128 if (128 < plen)
1129 return -1;
1130 itemlen -= 1;
1131
1132 memset(&addr, 0, sizeof(addr));
1133 plenbytes = (plen + 7) / 8;
1134 ND_TCHECK2(pd[1], plenbytes);
1135 ITEMCHECK(plenbytes);
1136 memcpy(&addr, &pd[1], plenbytes);
1137 if (plen % 8) {
1138 addr.s6_addr[plenbytes - 1] &=
1139 ((0xff00 >> (plen % 8)) & 0xff);
1140 }
1141 snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen);
1142 return 1 + plenbytes;
1143
1144 trunc:
1145 return -2;
1146
1147 badtlv:
1148 return -3;
1149 }
1150
1151 static int
1152 decode_labeled_prefix6(netdissect_options *ndo,
1153 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1154 {
1155 struct in6_addr addr;
1156 u_int plen, plenbytes;
1157
1158 /* prefix length and label = 4 bytes */
1159 ND_TCHECK2(pptr[0], 4);
1160 ITEMCHECK(4);
1161 plen = pptr[0]; /* get prefix length */
1162
1163 if (24 > plen)
1164 return -1;
1165
1166 plen-=24; /* adjust prefixlen - labellength */
1167
1168 if (128 < plen)
1169 return -1;
1170 itemlen -= 4;
1171
1172 memset(&addr, 0, sizeof(addr));
1173 plenbytes = (plen + 7) / 8;
1174 ND_TCHECK2(pptr[4], plenbytes);
1175 memcpy(&addr, &pptr[4], plenbytes);
1176 if (plen % 8) {
1177 addr.s6_addr[plenbytes - 1] &=
1178 ((0xff00 >> (plen % 8)) & 0xff);
1179 }
1180 /* the label may get offsetted by 4 bits so lets shift it right */
1181 snprintf(buf, buflen, "%s/%d, label:%u %s",
1182 ip6addr_string(ndo, &addr),
1183 plen,
1184 EXTRACT_24BITS(pptr+1)>>4,
1185 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1186
1187 return 4 + plenbytes;
1188
1189 trunc:
1190 return -2;
1191
1192 badtlv:
1193 return -3;
1194 }
1195
1196 static int
1197 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1198 const u_char *pptr, char *buf, u_int buflen)
1199 {
1200 struct in6_addr addr;
1201 u_int plen;
1202
1203 ND_TCHECK(pptr[0]);
1204 plen = pptr[0]; /* get prefix length */
1205
1206 if ((24+64) > plen)
1207 return -1;
1208
1209 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1210
1211 if (128 < plen)
1212 return -1;
1213
1214 memset(&addr, 0, sizeof(addr));
1215 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1216 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1217 if (plen % 8) {
1218 addr.s6_addr[(plen + 7) / 8 - 1] &=
1219 ((0xff00 >> (plen % 8)) & 0xff);
1220 }
1221 /* the label may get offsetted by 4 bits so lets shift it right */
1222 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1223 bgp_vpn_rd_print(ndo, pptr+4),
1224 ip6addr_string(ndo, &addr),
1225 plen,
1226 EXTRACT_24BITS(pptr+1)>>4,
1227 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1228
1229 return 12 + (plen + 7) / 8;
1230
1231 trunc:
1232 return -2;
1233 }
1234
1235 static int
1236 decode_clnp_prefix(netdissect_options *ndo,
1237 const u_char *pptr, char *buf, u_int buflen)
1238 {
1239 uint8_t addr[19];
1240 u_int plen;
1241
1242 ND_TCHECK(pptr[0]);
1243 plen = pptr[0]; /* get prefix length */
1244
1245 if (152 < plen)
1246 return -1;
1247
1248 memset(&addr, 0, sizeof(addr));
1249 ND_TCHECK2(pptr[4], (plen + 7) / 8);
1250 memcpy(&addr, &pptr[4], (plen + 7) / 8);
1251 if (plen % 8) {
1252 addr[(plen + 7) / 8 - 1] &=
1253 ((0xff00 >> (plen % 8)) & 0xff);
1254 }
1255 snprintf(buf, buflen, "%s/%d",
1256 isonsap_string(ndo, addr,(plen + 7) / 8),
1257 plen);
1258
1259 return 1 + (plen + 7) / 8;
1260
1261 trunc:
1262 return -2;
1263 }
1264
1265 static int
1266 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1267 const u_char *pptr, char *buf, u_int buflen)
1268 {
1269 uint8_t addr[19];
1270 u_int plen;
1271
1272 ND_TCHECK(pptr[0]);
1273 plen = pptr[0]; /* get prefix length */
1274
1275 if ((24+64) > plen)
1276 return -1;
1277
1278 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1279
1280 if (152 < plen)
1281 return -1;
1282
1283 memset(&addr, 0, sizeof(addr));
1284 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1285 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1286 if (plen % 8) {
1287 addr[(plen + 7) / 8 - 1] &=
1288 ((0xff00 >> (plen % 8)) & 0xff);
1289 }
1290 /* the label may get offsetted by 4 bits so lets shift it right */
1291 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1292 bgp_vpn_rd_print(ndo, pptr+4),
1293 isonsap_string(ndo, addr,(plen + 7) / 8),
1294 plen,
1295 EXTRACT_24BITS(pptr+1)>>4,
1296 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1297
1298 return 12 + (plen + 7) / 8;
1299
1300 trunc:
1301 return -2;
1302 }
1303
1304 /*
1305 * bgp_attr_get_as_size
1306 *
1307 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1308 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1309 * support, exchange AS-Path with the same path-attribute type value 0x02.
1310 */
1311 static int
1312 bgp_attr_get_as_size(netdissect_options *ndo,
1313 uint8_t bgpa_type, const u_char *pptr, int len)
1314 {
1315 const u_char *tptr = pptr;
1316
1317 /*
1318 * If the path attribute is the optional AS4 path type, then we already
1319 * know, that ASs must be encoded in 4 byte format.
1320 */
1321 if (bgpa_type == BGPTYPE_AS4_PATH) {
1322 return 4;
1323 }
1324
1325 /*
1326 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1327 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1328 * each.
1329 */
1330 while (tptr < pptr + len) {
1331 ND_TCHECK(tptr[0]);
1332
1333 /*
1334 * If we do not find a valid segment type, our guess might be wrong.
1335 */
1336 if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) {
1337 goto trunc;
1338 }
1339 ND_TCHECK(tptr[1]);
1340 tptr += 2 + tptr[1] * 2;
1341 }
1342
1343 /*
1344 * If we correctly reached end of the AS path attribute data content,
1345 * then most likely ASs were indeed encoded as 2 bytes.
1346 */
1347 if (tptr == pptr + len) {
1348 return 2;
1349 }
1350
1351 trunc:
1352
1353 /*
1354 * We can come here, either we did not have enough data, or if we
1355 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1356 * so that calller can try to decode each AS as of 4 bytes. If indeed
1357 * there was not enough data, it will crib and end the parse anyways.
1358 */
1359 return 4;
1360 }
1361
1362 static int
1363 bgp_attr_print(netdissect_options *ndo,
1364 u_int atype, const u_char *pptr, u_int len, const unsigned attr_set_level)
1365 {
1366 int i;
1367 uint16_t af;
1368 uint8_t safi, snpa, nhlen;
1369 union { /* copy buffer for bandwidth values */
1370 float f;
1371 uint32_t i;
1372 } bw;
1373 int advance;
1374 u_int tlen;
1375 const u_char *tptr;
1376 char buf[MAXHOSTNAMELEN + 100];
1377 int as_size;
1378
1379 tptr = pptr;
1380 tlen=len;
1381
1382 switch (atype) {
1383 case BGPTYPE_ORIGIN:
1384 if (len != 1)
1385 ND_PRINT((ndo, "invalid len"));
1386 else {
1387 ND_TCHECK(*tptr);
1388 ND_PRINT((ndo, "%s", tok2str(bgp_origin_values,
1389 "Unknown Origin Typecode",
1390 tptr[0])));
1391 }
1392 break;
1393
1394 /*
1395 * Process AS4 byte path and AS2 byte path attributes here.
1396 */
1397 case BGPTYPE_AS4_PATH:
1398 case BGPTYPE_AS_PATH:
1399 if (len % 2) {
1400 ND_PRINT((ndo, "invalid len"));
1401 break;
1402 }
1403 if (!len) {
1404 ND_PRINT((ndo, "empty"));
1405 break;
1406 }
1407
1408 /*
1409 * BGP updates exchanged between New speakers that support 4
1410 * byte AS, ASs are always encoded in 4 bytes. There is no
1411 * definitive way to find this, just by the packet's
1412 * contents. So, check for packet's TLV's sanity assuming
1413 * 2 bytes first, and it does not pass, assume that ASs are
1414 * encoded in 4 bytes format and move on.
1415 */
1416 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1417
1418 while (tptr < pptr + len) {
1419 ND_TCHECK(tptr[0]);
1420 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values,
1421 "?", tptr[0])));
1422 ND_TCHECK(tptr[1]);
1423 for (i = 0; i < tptr[1] * as_size; i += as_size) {
1424 ND_TCHECK2(tptr[2 + i], as_size);
1425 ND_PRINT((ndo, "%s ",
1426 as_printf(ndo, astostr, sizeof(astostr),
1427 as_size == 2 ?
1428 EXTRACT_16BITS(&tptr[2 + i]) :
1429 EXTRACT_32BITS(&tptr[2 + i]))));
1430 }
1431 ND_TCHECK(tptr[0]);
1432 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values,
1433 "?", tptr[0])));
1434 ND_TCHECK(tptr[1]);
1435 tptr += 2 + tptr[1] * as_size;
1436 }
1437 break;
1438 case BGPTYPE_NEXT_HOP:
1439 if (len != 4)
1440 ND_PRINT((ndo, "invalid len"));
1441 else {
1442 ND_TCHECK2(tptr[0], 4);
1443 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1444 }
1445 break;
1446 case BGPTYPE_MULTI_EXIT_DISC:
1447 case BGPTYPE_LOCAL_PREF:
1448 if (len != 4)
1449 ND_PRINT((ndo, "invalid len"));
1450 else {
1451 ND_TCHECK2(tptr[0], 4);
1452 ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr)));
1453 }
1454 break;
1455 case BGPTYPE_ATOMIC_AGGREGATE:
1456 if (len != 0)
1457 ND_PRINT((ndo, "invalid len"));
1458 break;
1459 case BGPTYPE_AGGREGATOR:
1460
1461 /*
1462 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1463 * the length of this PA can be either 6 bytes or 8 bytes.
1464 */
1465 if (len != 6 && len != 8) {
1466 ND_PRINT((ndo, "invalid len"));
1467 break;
1468 }
1469 ND_TCHECK2(tptr[0], len);
1470 if (len == 6) {
1471 ND_PRINT((ndo, " AS #%s, origin %s",
1472 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)),
1473 ipaddr_string(ndo, tptr + 2)));
1474 } else {
1475 ND_PRINT((ndo, " AS #%s, origin %s",
1476 as_printf(ndo, astostr, sizeof(astostr),
1477 EXTRACT_32BITS(tptr)), ipaddr_string(ndo, tptr + 4)));
1478 }
1479 break;
1480 case BGPTYPE_AGGREGATOR4:
1481 if (len != 8) {
1482 ND_PRINT((ndo, "invalid len"));
1483 break;
1484 }
1485 ND_TCHECK2(tptr[0], 8);
1486 ND_PRINT((ndo, " AS #%s, origin %s",
1487 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)),
1488 ipaddr_string(ndo, tptr + 4)));
1489 break;
1490 case BGPTYPE_COMMUNITIES:
1491 if (len % 4) {
1492 ND_PRINT((ndo, "invalid len"));
1493 break;
1494 }
1495 while (tlen>0) {
1496 uint32_t comm;
1497 ND_TCHECK2(tptr[0], 4);
1498 comm = EXTRACT_32BITS(tptr);
1499 switch (comm) {
1500 case BGP_COMMUNITY_NO_EXPORT:
1501 ND_PRINT((ndo, " NO_EXPORT"));
1502 break;
1503 case BGP_COMMUNITY_NO_ADVERT:
1504 ND_PRINT((ndo, " NO_ADVERTISE"));
1505 break;
1506 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1507 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1508 break;
1509 default:
1510 ND_PRINT((ndo, "%u:%u%s",
1511 (comm >> 16) & 0xffff,
1512 comm & 0xffff,
1513 (tlen>4) ? ", " : ""));
1514 break;
1515 }
1516 tlen -=4;
1517 tptr +=4;
1518 }
1519 break;
1520 case BGPTYPE_ORIGINATOR_ID:
1521 if (len != 4) {
1522 ND_PRINT((ndo, "invalid len"));
1523 break;
1524 }
1525 ND_TCHECK2(tptr[0], 4);
1526 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1527 break;
1528 case BGPTYPE_CLUSTER_LIST:
1529 if (len % 4) {
1530 ND_PRINT((ndo, "invalid len"));
1531 break;
1532 }
1533 while (tlen>0) {
1534 ND_TCHECK2(tptr[0], 4);
1535 ND_PRINT((ndo, "%s%s",
1536 ipaddr_string(ndo, tptr),
1537 (tlen>4) ? ", " : ""));
1538 tlen -=4;
1539 tptr +=4;
1540 }
1541 break;
1542 case BGPTYPE_MP_REACH_NLRI:
1543 ND_TCHECK2(tptr[0], 3);
1544 af = EXTRACT_16BITS(tptr);
1545 safi = tptr[2];
1546
1547 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1548 tok2str(af_values, "Unknown AFI", af),
1549 af,
1550 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1551 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1552 safi));
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_VPNUNICAST):
1561 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1562 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1563 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1564 case (AFNUM_INET<<8 | SAFNUM_MDT):
1565 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1566 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1567 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1568 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1569 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1570 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1571 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1572 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1573 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1574 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1575 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1576 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1577 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1578 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1579 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1580 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1581 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1582 break;
1583 default:
1584 ND_TCHECK2(tptr[0], tlen);
1585 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1586 if (ndo->ndo_vflag <= 1)
1587 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1588 goto done;
1589 break;
1590 }
1591
1592 tptr +=3;
1593
1594 ND_TCHECK(tptr[0]);
1595 nhlen = tptr[0];
1596 tlen = nhlen;
1597 tptr++;
1598
1599 if (tlen) {
1600 int nnh = 0;
1601 ND_PRINT((ndo, "\n\t nexthop: "));
1602 while (tlen > 0) {
1603 if ( nnh++ > 0 ) {
1604 ND_PRINT((ndo, ", " ));
1605 }
1606 switch(af<<8 | safi) {
1607 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1608 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1609 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1610 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1611 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1612 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1613 case (AFNUM_INET<<8 | SAFNUM_MDT):
1614 if (tlen < (int)sizeof(struct in_addr)) {
1615 ND_PRINT((ndo, "invalid len"));
1616 tlen = 0;
1617 } else {
1618 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1619 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1620 tlen -= sizeof(struct in_addr);
1621 tptr += sizeof(struct in_addr);
1622 }
1623 break;
1624 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1625 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1626 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1627 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) {
1628 ND_PRINT((ndo, "invalid len"));
1629 tlen = 0;
1630 } else {
1631 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1632 ND_PRINT((ndo, "RD: %s, %s",
1633 bgp_vpn_rd_print(ndo, tptr),
1634 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1635 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1636 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1637 }
1638 break;
1639 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1640 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1641 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1642 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1643 if (tlen < (int)sizeof(struct in6_addr)) {
1644 ND_PRINT((ndo, "invalid len"));
1645 tlen = 0;
1646 } else {
1647 ND_TCHECK2(tptr[0], sizeof(struct in6_addr));
1648 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr)));
1649 tlen -= sizeof(struct in6_addr);
1650 tptr += sizeof(struct in6_addr);
1651 }
1652 break;
1653 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1654 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1655 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1656 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) {
1657 ND_PRINT((ndo, "invalid len"));
1658 tlen = 0;
1659 } else {
1660 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1661 ND_PRINT((ndo, "RD: %s, %s",
1662 bgp_vpn_rd_print(ndo, tptr),
1663 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1664 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1665 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1666 }
1667 break;
1668 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1669 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1670 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1671 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1672 if (tlen < (int)sizeof(struct in_addr)) {
1673 ND_PRINT((ndo, "invalid len"));
1674 tlen = 0;
1675 } else {
1676 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1677 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1678 tlen -= (sizeof(struct in_addr));
1679 tptr += (sizeof(struct in_addr));
1680 }
1681 break;
1682 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1683 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1684 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1685 ND_TCHECK2(tptr[0], tlen);
1686 ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen)));
1687 tptr += tlen;
1688 tlen = 0;
1689 break;
1690
1691 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1692 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1693 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1694 if (tlen < BGP_VPN_RD_LEN+1) {
1695 ND_PRINT((ndo, "invalid len"));
1696 tlen = 0;
1697 } else {
1698 ND_TCHECK2(tptr[0], tlen);
1699 ND_PRINT((ndo, "RD: %s, %s",
1700 bgp_vpn_rd_print(ndo, tptr),
1701 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1702 /* rfc986 mapped IPv4 address ? */
1703 if (tlen == BGP_VPN_RD_LEN + 4 + sizeof(struct in_addr)
1704 && EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601)
1705 ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4)));
1706 /* rfc1888 mapped IPv6 address ? */
1707 else if (tlen == BGP_VPN_RD_LEN + 3 + sizeof(struct in6_addr)
1708 && EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000)
1709 ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3)));
1710 tptr += tlen;
1711 tlen = 0;
1712 }
1713 break;
1714 default:
1715 ND_TCHECK2(tptr[0], tlen);
1716 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1717 if (ndo->ndo_vflag <= 1)
1718 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1719 tptr += tlen;
1720 tlen = 0;
1721 goto done;
1722 break;
1723 }
1724 }
1725 }
1726 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1727 tptr += tlen;
1728
1729 ND_TCHECK(tptr[0]);
1730 snpa = tptr[0];
1731 tptr++;
1732
1733 if (snpa) {
1734 ND_PRINT((ndo, "\n\t %u SNPA", snpa));
1735 for (/*nothing*/; snpa > 0; snpa--) {
1736 ND_TCHECK(tptr[0]);
1737 ND_PRINT((ndo, "\n\t %d bytes", tptr[0]));
1738 tptr += tptr[0] + 1;
1739 }
1740 } else {
1741 ND_PRINT((ndo, ", no SNPA"));
1742 }
1743
1744 while (tptr < pptr + len) {
1745 switch (af<<8 | safi) {
1746 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1747 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1748 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1749 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1750 if (advance == -1)
1751 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1752 else if (advance == -2)
1753 goto trunc;
1754 else if (advance == -3)
1755 break; /* bytes left, but not enough */
1756 else
1757 ND_PRINT((ndo, "\n\t %s", buf));
1758 break;
1759 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1760 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1761 if (advance == -1)
1762 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1763 else if (advance == -2)
1764 goto trunc;
1765 else if (advance == -3)
1766 break; /* bytes left, but not enough */
1767 else
1768 ND_PRINT((ndo, "\n\t %s", buf));
1769 break;
1770 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1771 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1772 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1773 advance = decode_labeled_vpn_prefix4(ndo, tptr, 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
1779 ND_PRINT((ndo, "\n\t %s", buf));
1780 break;
1781 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1782 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf));
1783 if (advance == -1)
1784 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1785 else if (advance == -2)
1786 goto trunc;
1787 else
1788 ND_PRINT((ndo, "\n\t %s", buf));
1789 break;
1790 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1791 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1792 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1793 if (advance == -1)
1794 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1795 else if (advance == -2)
1796 goto trunc;
1797 else
1798 ND_PRINT((ndo, "\n\t %s", buf));
1799 break;
1800
1801 case (AFNUM_INET<<8 | SAFNUM_MDT):
1802 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1803 if (advance == -1)
1804 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1805 else if (advance == -2)
1806 goto trunc;
1807 else
1808 ND_PRINT((ndo, "\n\t %s", buf));
1809 break;
1810 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1811 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1812 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1813 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1814 if (advance == -1)
1815 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1816 else if (advance == -2)
1817 goto trunc;
1818 else if (advance == -3)
1819 break; /* bytes left, but not enough */
1820 else
1821 ND_PRINT((ndo, "\n\t %s", buf));
1822 break;
1823 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1824 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1825 if (advance == -1)
1826 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1827 else if (advance == -2)
1828 goto trunc;
1829 else if (advance == -3)
1830 break; /* bytes left, but not enough */
1831 else
1832 ND_PRINT((ndo, "\n\t %s", buf));
1833 break;
1834 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1835 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1836 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1837 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1838 if (advance == -1)
1839 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1840 else if (advance == -2)
1841 goto trunc;
1842 else
1843 ND_PRINT((ndo, "\n\t %s", buf));
1844 break;
1845 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1846 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1847 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1848 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1849 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1850 if (advance == -1)
1851 ND_PRINT((ndo, "\n\t (illegal length)"));
1852 else if (advance == -2)
1853 goto trunc;
1854 else
1855 ND_PRINT((ndo, "\n\t %s", buf));
1856 break;
1857 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1858 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1859 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1860 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1861 if (advance == -1)
1862 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1863 else if (advance == -2)
1864 goto trunc;
1865 else
1866 ND_PRINT((ndo, "\n\t %s", buf));
1867 break;
1868 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1869 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1870 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1871 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, 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
1877 ND_PRINT((ndo, "\n\t %s", buf));
1878 break;
1879 default:
1880 ND_TCHECK2(*tptr,tlen);
1881 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1882 if (ndo->ndo_vflag <= 1)
1883 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1884 advance = 0;
1885 tptr = pptr + len;
1886 break;
1887 }
1888 if (advance < 0)
1889 break;
1890 tptr += advance;
1891 }
1892 done:
1893 break;
1894
1895 case BGPTYPE_MP_UNREACH_NLRI:
1896 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE);
1897 af = EXTRACT_16BITS(tptr);
1898 safi = tptr[2];
1899
1900 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1901 tok2str(af_values, "Unknown AFI", af),
1902 af,
1903 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1904 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1905 safi));
1906
1907 if (len == BGP_MP_NLRI_MINSIZE)
1908 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
1909
1910 tptr += 3;
1911
1912 while (tptr < pptr + len) {
1913 switch (af<<8 | safi) {
1914 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1915 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1916 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1917 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1918 if (advance == -1)
1919 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1920 else if (advance == -2)
1921 goto trunc;
1922 else if (advance == -3)
1923 break; /* bytes left, but not enough */
1924 else
1925 ND_PRINT((ndo, "\n\t %s", buf));
1926 break;
1927 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1928 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1929 if (advance == -1)
1930 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1931 else if (advance == -2)
1932 goto trunc;
1933 else if (advance == -3)
1934 break; /* bytes left, but not enough */
1935 else
1936 ND_PRINT((ndo, "\n\t %s", buf));
1937 break;
1938 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1939 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1940 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1941 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1942 if (advance == -1)
1943 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1944 else if (advance == -2)
1945 goto trunc;
1946 else
1947 ND_PRINT((ndo, "\n\t %s", buf));
1948 break;
1949 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1950 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1951 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1952 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1953 if (advance == -1)
1954 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1955 else if (advance == -2)
1956 goto trunc;
1957 else if (advance == -3)
1958 break; /* bytes left, but not enough */
1959 else
1960 ND_PRINT((ndo, "\n\t %s", buf));
1961 break;
1962 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1963 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1964 if (advance == -1)
1965 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1966 else if (advance == -2)
1967 goto trunc;
1968 else if (advance == -3)
1969 break; /* bytes left, but not enough */
1970 else
1971 ND_PRINT((ndo, "\n\t %s", buf));
1972 break;
1973 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1974 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1975 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1976 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1977 if (advance == -1)
1978 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1979 else if (advance == -2)
1980 goto trunc;
1981 else
1982 ND_PRINT((ndo, "\n\t %s", buf));
1983 break;
1984 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1985 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1986 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1987 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1988 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1989 if (advance == -1)
1990 ND_PRINT((ndo, "\n\t (illegal length)"));
1991 else if (advance == -2)
1992 goto trunc;
1993 else
1994 ND_PRINT((ndo, "\n\t %s", buf));
1995 break;
1996 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1997 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1998 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1999 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2000 if (advance == -1)
2001 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2002 else if (advance == -2)
2003 goto trunc;
2004 else
2005 ND_PRINT((ndo, "\n\t %s", buf));
2006 break;
2007 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2008 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2009 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2010 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2011 if (advance == -1)
2012 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2013 else if (advance == -2)
2014 goto trunc;
2015 else
2016 ND_PRINT((ndo, "\n\t %s", buf));
2017 break;
2018 case (AFNUM_INET<<8 | SAFNUM_MDT):
2019 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
2020 if (advance == -1)
2021 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2022 else if (advance == -2)
2023 goto trunc;
2024 else
2025 ND_PRINT((ndo, "\n\t %s", buf));
2026 break;
2027 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
2028 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
2029 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
2030 if (advance == -1)
2031 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2032 else if (advance == -2)
2033 goto trunc;
2034 else
2035 ND_PRINT((ndo, "\n\t %s", buf));
2036 break;
2037 default:
2038 ND_TCHECK2(*(tptr-3),tlen);
2039 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
2040 if (ndo->ndo_vflag <= 1)
2041 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
2042 advance = 0;
2043 tptr = pptr + len;
2044 break;
2045 }
2046 if (advance < 0)
2047 break;
2048 tptr += advance;
2049 }
2050 break;
2051 case BGPTYPE_EXTD_COMMUNITIES:
2052 if (len % 8) {
2053 ND_PRINT((ndo, "invalid len"));
2054 break;
2055 }
2056 while (tlen>0) {
2057 uint16_t extd_comm;
2058
2059 ND_TCHECK2(tptr[0], 2);
2060 extd_comm=EXTRACT_16BITS(tptr);
2061
2062 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]",
2063 tok2str(bgp_extd_comm_subtype_values,
2064 "unknown extd community typecode",
2065 extd_comm),
2066 extd_comm,
2067 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2068
2069 ND_TCHECK2(*(tptr+2), 6);
2070 switch(extd_comm) {
2071 case BGP_EXT_COM_RT_0:
2072 case BGP_EXT_COM_RO_0:
2073 case BGP_EXT_COM_L2VPN_RT_0:
2074 ND_PRINT((ndo, ": %u:%u (= %s)",
2075 EXTRACT_16BITS(tptr+2),
2076 EXTRACT_32BITS(tptr+4),
2077 ipaddr_string(ndo, tptr+4)));
2078 break;
2079 case BGP_EXT_COM_RT_1:
2080 case BGP_EXT_COM_RO_1:
2081 case BGP_EXT_COM_L2VPN_RT_1:
2082 case BGP_EXT_COM_VRF_RT_IMP:
2083 ND_PRINT((ndo, ": %s:%u",
2084 ipaddr_string(ndo, tptr+2),
2085 EXTRACT_16BITS(tptr+6)));
2086 break;
2087 case BGP_EXT_COM_RT_2:
2088 case BGP_EXT_COM_RO_2:
2089 ND_PRINT((ndo, ": %s:%u",
2090 as_printf(ndo, astostr, sizeof(astostr),
2091 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6)));
2092 break;
2093 case BGP_EXT_COM_LINKBAND:
2094 bw.i = EXTRACT_32BITS(tptr+2);
2095 ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2096 bw.f*8/1000000));
2097 break;
2098 case BGP_EXT_COM_VPN_ORIGIN:
2099 case BGP_EXT_COM_VPN_ORIGIN2:
2100 case BGP_EXT_COM_VPN_ORIGIN3:
2101 case BGP_EXT_COM_VPN_ORIGIN4:
2102 case BGP_EXT_COM_OSPF_RID:
2103 case BGP_EXT_COM_OSPF_RID2:
2104 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2)));
2105 break;
2106 case BGP_EXT_COM_OSPF_RTYPE:
2107 case BGP_EXT_COM_OSPF_RTYPE2:
2108 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2109 ipaddr_string(ndo, tptr+2),
2110 tok2str(bgp_extd_comm_ospf_rtype_values,
2111 "unknown (0x%02x)",
2112 *(tptr+6)),
2113 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2114 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2115 break;
2116 case BGP_EXT_COM_L2INFO:
2117 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2118 tok2str(l2vpn_encaps_values,
2119 "unknown encaps",
2120 *(tptr+2)),
2121 *(tptr+3),
2122 EXTRACT_16BITS(tptr+4)));
2123 break;
2124 case BGP_EXT_COM_SOURCE_AS:
2125 ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2)));
2126 break;
2127 default:
2128 ND_TCHECK2(*tptr,8);
2129 print_unknown_data(ndo, tptr, "\n\t ", 8);
2130 break;
2131 }
2132 tlen -=8;
2133 tptr +=8;
2134 }
2135 break;
2136
2137 case BGPTYPE_PMSI_TUNNEL:
2138 {
2139 uint8_t tunnel_type, flags;
2140
2141 ND_TCHECK2(tptr[0], 5);
2142 tunnel_type = *(tptr+1);
2143 flags = *tptr;
2144 tlen = len;
2145
2146 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2147 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2148 tunnel_type,
2149 bittok2str(bgp_pmsi_flag_values, "none", flags),
2150 EXTRACT_24BITS(tptr+2)>>4));
2151
2152 tptr +=5;
2153 tlen -= 5;
2154
2155 switch (tunnel_type) {
2156 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2157 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2158 ND_TCHECK2(tptr[0], 8);
2159 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s",
2160 ipaddr_string(ndo, tptr),
2161 ipaddr_string(ndo, tptr+4)));
2162 break;
2163
2164 case BGP_PMSI_TUNNEL_PIM_SSM:
2165 ND_TCHECK2(tptr[0], 8);
2166 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s",
2167 ipaddr_string(ndo, tptr),
2168 ipaddr_string(ndo, tptr+4)));
2169 break;
2170 case BGP_PMSI_TUNNEL_INGRESS:
2171 ND_TCHECK2(tptr[0], 4);
2172 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s",
2173 ipaddr_string(ndo, tptr)));
2174 break;
2175 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2176 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2177 ND_TCHECK2(tptr[0], 8);
2178 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x",
2179 ipaddr_string(ndo, tptr),
2180 EXTRACT_32BITS(tptr+4)));
2181 break;
2182 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2183 ND_TCHECK2(tptr[0], 8);
2184 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2185 ipaddr_string(ndo, tptr),
2186 EXTRACT_32BITS(tptr+4)));
2187 break;
2188 default:
2189 if (ndo->ndo_vflag <= 1) {
2190 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2191 }
2192 }
2193 break;
2194 }
2195 case BGPTYPE_AIGP:
2196 {
2197 uint8_t type;
2198 uint16_t length;
2199
2200 tlen = len;
2201
2202 while (tlen >= 3) {
2203
2204 ND_TCHECK2(tptr[0], 3);
2205
2206 type = *tptr;
2207 length = EXTRACT_16BITS(tptr+1);
2208 tptr += 3;
2209 tlen -= 3;
2210
2211 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u",
2212 tok2str(bgp_aigp_values, "Unknown", type),
2213 type, length));
2214
2215 if (length < 3)
2216 goto trunc;
2217 length -= 3;
2218
2219 /*
2220 * Check if we can read the TLV data.
2221 */
2222 ND_TCHECK2(tptr[3], length);
2223
2224 switch (type) {
2225
2226 case BGP_AIGP_TLV:
2227 if (length < 8)
2228 goto trunc;
2229 ND_PRINT((ndo, ", metric %" PRIu64,
2230 EXTRACT_64BITS(tptr)));
2231 break;
2232
2233 default:
2234 if (ndo->ndo_vflag <= 1) {
2235 print_unknown_data(ndo, tptr,"\n\t ", length);
2236 }
2237 }
2238
2239 tptr += length;
2240 tlen -= length;
2241 }
2242 break;
2243 }
2244 case BGPTYPE_ATTR_SET:
2245 ND_TCHECK2(tptr[0], 4);
2246 if (len < 4)
2247 goto trunc;
2248 ND_PRINT((ndo, "\n\t Origin AS: %s",
2249 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr))));
2250 tptr+=4;
2251 len -=4;
2252
2253 while (len) {
2254 u_int aflags, alenlen, alen;
2255
2256 ND_TCHECK2(tptr[0], 2);
2257 if (len < 2)
2258 goto trunc;
2259 aflags = *tptr;
2260 atype = *(tptr + 1);
2261 tptr += 2;
2262 len -= 2;
2263 alenlen = bgp_attr_lenlen(aflags, tptr);
2264 ND_TCHECK2(tptr[0], alenlen);
2265 if (len < alenlen)
2266 goto trunc;
2267 alen = bgp_attr_len(aflags, tptr);
2268 tptr += alenlen;
2269 len -= alenlen;
2270
2271 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2272 tok2str(bgp_attr_values,
2273 "Unknown Attribute", atype),
2274 atype,
2275 alen));
2276
2277 if (aflags) {
2278 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2279 aflags & 0x80 ? "O" : "",
2280 aflags & 0x40 ? "T" : "",
2281 aflags & 0x20 ? "P" : "",
2282 aflags & 0x10 ? "E" : ""));
2283 if (aflags & 0xf)
2284 ND_PRINT((ndo, "+%x", aflags & 0xf));
2285 ND_PRINT((ndo, "]: "));
2286 }
2287 /* The protocol encoding per se allows ATTR_SET to be nested as many times
2288 * as the message can accommodate. This printer used to be able to recurse
2289 * into ATTR_SET contents until the stack exhaustion, but now there is a
2290 * limit on that (if live protocol exchange goes that many levels deep,
2291 * something is probably wrong anyway). Feel free to refine this value if
2292 * you can find the spec with respective normative text.
2293 */
2294 if (attr_set_level == 10)
2295 ND_PRINT((ndo, "(too many nested levels, not recursing)"));
2296 else if (!bgp_attr_print(ndo, atype, tptr, alen, attr_set_level + 1))
2297 return 0;
2298 tptr += alen;
2299 len -= alen;
2300 }
2301 break;
2302
2303 case BGPTYPE_LARGE_COMMUNITY:
2304 if (len == 0 || len % 12) {
2305 ND_PRINT((ndo, "invalid len"));
2306 break;
2307 }
2308 ND_PRINT((ndo, "\n\t "));
2309 while (len > 0) {
2310 ND_TCHECK2(*tptr, 12);
2311 ND_PRINT((ndo, "%u:%u:%u%s",
2312 EXTRACT_32BITS(tptr),
2313 EXTRACT_32BITS(tptr + 4),
2314 EXTRACT_32BITS(tptr + 8),
2315 (len > 12) ? ", " : ""));
2316 tptr += 12;
2317 len -= 12;
2318 }
2319 break;
2320 default:
2321 ND_TCHECK2(*pptr,len);
2322 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2323 if (ndo->ndo_vflag <= 1)
2324 print_unknown_data(ndo, pptr, "\n\t ", len);
2325 break;
2326 }
2327 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2328 ND_TCHECK2(*pptr,len);
2329 print_unknown_data(ndo, pptr, "\n\t ", len);
2330 }
2331 return 1;
2332
2333 trunc:
2334 return 0;
2335 }
2336
2337 static void
2338 bgp_capabilities_print(netdissect_options *ndo,
2339 const u_char *opt, int caps_len)
2340 {
2341 int cap_type, cap_len, tcap_len, cap_offset;
2342 int i = 0;
2343
2344 while (i < caps_len) {
2345 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE);
2346 cap_type=opt[i];
2347 cap_len=opt[i+1];
2348 tcap_len=cap_len;
2349 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2350 tok2str(bgp_capcode_values, "Unknown",
2351 cap_type),
2352 cap_type,
2353 cap_len));
2354 ND_TCHECK2(opt[i+2], cap_len);
2355 switch (cap_type) {
2356 case BGP_CAPCODE_MP:
2357 /* AFI (16 bits), Reserved (8 bits), SAFI (8 bits) */
2358 ND_TCHECK_8BITS(opt + i + 5);
2359 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2360 tok2str(af_values, "Unknown",
2361 EXTRACT_16BITS(opt+i+2)),
2362 EXTRACT_16BITS(opt+i+2),
2363 tok2str(bgp_safi_values, "Unknown",
2364 opt[i+5]),
2365 opt[i+5]));
2366 break;
2367 case BGP_CAPCODE_RESTART:
2368 /* Restart Flags (4 bits), Restart Time in seconds (12 bits) */
2369 ND_TCHECK_16BITS(opt + i + 2);
2370 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2371 ((opt[i+2])&0x80) ? "R" : "none",
2372 EXTRACT_16BITS(opt+i+2)&0xfff));
2373 tcap_len-=2;
2374 cap_offset=4;
2375 while(tcap_len>=4) {
2376 ND_TCHECK_8BITS(opt + i + cap_offset + 3);
2377 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2378 tok2str(af_values,"Unknown",
2379 EXTRACT_16BITS(opt+i+cap_offset)),
2380 EXTRACT_16BITS(opt+i+cap_offset),
2381 tok2str(bgp_safi_values,"Unknown",
2382 opt[i+cap_offset+2]),
2383 opt[i+cap_offset+2],
2384 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" ));
2385 tcap_len-=4;
2386 cap_offset+=4;
2387 }
2388 break;
2389 case BGP_CAPCODE_RR:
2390 case BGP_CAPCODE_RR_CISCO:
2391 break;
2392 case BGP_CAPCODE_AS_NEW:
2393
2394 /*
2395 * Extract the 4 byte AS number encoded.
2396 */
2397 if (cap_len == 4) {
2398 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2399 as_printf(ndo, astostr, sizeof(astostr),
2400 EXTRACT_32BITS(opt + i + 2))));
2401 }
2402 break;
2403 case BGP_CAPCODE_ADD_PATH:
2404 cap_offset=2;
2405 if (tcap_len == 0) {
2406 ND_PRINT((ndo, " (bogus)")); /* length */
2407 break;
2408 }
2409 while (tcap_len > 0) {
2410 if (tcap_len < 4) {
2411 ND_PRINT((ndo, "\n\t\t(invalid)"));
2412 break;
2413 }
2414 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2415 tok2str(af_values,"Unknown",EXTRACT_16BITS(opt+i+cap_offset)),
2416 EXTRACT_16BITS(opt+i+cap_offset),
2417 tok2str(bgp_safi_values,"Unknown",opt[i+cap_offset+2]),
2418 opt[i+cap_offset+2],
2419 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",opt[i+cap_offset+3])
2420 ));
2421 tcap_len-=4;
2422 cap_offset+=4;
2423 }
2424 break;
2425 default:
2426 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2427 cap_type));
2428 if (ndo->ndo_vflag <= 1)
2429 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2430 break;
2431 }
2432 if (ndo->ndo_vflag > 1 && cap_len > 0) {
2433 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2434 }
2435 i += BGP_CAP_HEADER_SIZE + cap_len;
2436 }
2437 return;
2438
2439 trunc:
2440 ND_PRINT((ndo, "%s", tstr));
2441 }
2442
2443 static void
2444 bgp_open_print(netdissect_options *ndo,
2445 const u_char *dat, int length)
2446 {
2447 struct bgp_open bgpo;
2448 struct bgp_opt bgpopt;
2449 const u_char *opt;
2450 int i;
2451
2452 ND_TCHECK2(dat[0], BGP_OPEN_SIZE);
2453 memcpy(&bgpo, dat, BGP_OPEN_SIZE);
2454
2455 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version));
2456 ND_PRINT((ndo, "my AS %s, ",
2457 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas))));
2458 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime)));
2459 ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgpo.bgpo_id)));
2460 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen));
2461
2462 /* some little sanity checking */
2463 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE)
2464 return;
2465
2466 /* ugly! */
2467 opt = &((const struct bgp_open *)dat)->bgpo_optlen;
2468 opt++;
2469
2470 i = 0;
2471 while (i < bgpo.bgpo_optlen) {
2472 ND_TCHECK2(opt[i], BGP_OPT_SIZE);
2473 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE);
2474 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
2475 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len));
2476 break;
2477 }
2478
2479 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u",
2480 tok2str(bgp_opt_values,"Unknown",
2481 bgpopt.bgpopt_type),
2482 bgpopt.bgpopt_type,
2483 bgpopt.bgpopt_len));
2484
2485 /* now let's decode the options we know*/
2486 switch(bgpopt.bgpopt_type) {
2487
2488 case BGP_OPT_CAP:
2489 bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE],
2490 bgpopt.bgpopt_len);
2491 break;
2492
2493 case BGP_OPT_AUTH:
2494 default:
2495 ND_PRINT((ndo, "\n\t no decoder for option %u",
2496 bgpopt.bgpopt_type));
2497 break;
2498 }
2499 i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
2500 }
2501 return;
2502 trunc:
2503 ND_PRINT((ndo, "%s", tstr));
2504 }
2505
2506 static void
2507 bgp_update_print(netdissect_options *ndo,
2508 const u_char *dat, int length)
2509 {
2510 struct bgp bgp;
2511 const u_char *p;
2512 int withdrawn_routes_len;
2513 int len;
2514 int i;
2515
2516 ND_TCHECK2(dat[0], BGP_SIZE);
2517 if (length < BGP_SIZE)
2518 goto trunc;
2519 memcpy(&bgp, dat, BGP_SIZE);
2520 p = dat + BGP_SIZE; /*XXX*/
2521 length -= BGP_SIZE;
2522
2523 /* Unfeasible routes */
2524 ND_TCHECK2(p[0], 2);
2525 if (length < 2)
2526 goto trunc;
2527 withdrawn_routes_len = EXTRACT_16BITS(p);
2528 p += 2;
2529 length -= 2;
2530 if (withdrawn_routes_len) {
2531 /*
2532 * Without keeping state from the original NLRI message,
2533 * it's not possible to tell if this a v4 or v6 route,
2534 * so only try to decode it if we're not v6 enabled.
2535 */
2536 ND_TCHECK2(p[0], withdrawn_routes_len);
2537 if (length < withdrawn_routes_len)
2538 goto trunc;
2539 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len));
2540 p += withdrawn_routes_len;
2541 length -= withdrawn_routes_len;
2542 }
2543
2544 ND_TCHECK2(p[0], 2);
2545 if (length < 2)
2546 goto trunc;
2547 len = EXTRACT_16BITS(p);
2548 p += 2;
2549 length -= 2;
2550
2551 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2552 /* No withdrawn routes, no path attributes, no NLRI */
2553 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2554 return;
2555 }
2556
2557 if (len) {
2558 /* do something more useful!*/
2559 while (len) {
2560 int aflags, atype, alenlen, alen;
2561
2562 ND_TCHECK2(p[0], 2);
2563 if (len < 2)
2564 goto trunc;
2565 if (length < 2)
2566 goto trunc;
2567 aflags = *p;
2568 atype = *(p + 1);
2569 p += 2;
2570 len -= 2;
2571 length -= 2;
2572 alenlen = bgp_attr_lenlen(aflags, p);
2573 ND_TCHECK2(p[0], alenlen);
2574 if (len < alenlen)
2575 goto trunc;
2576 if (length < alenlen)
2577 goto trunc;
2578 alen = bgp_attr_len(aflags, p);
2579 p += alenlen;
2580 len -= alenlen;
2581 length -= alenlen;
2582
2583 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2584 tok2str(bgp_attr_values, "Unknown Attribute",
2585 atype),
2586 atype,
2587 alen));
2588
2589 if (aflags) {
2590 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2591 aflags & 0x80 ? "O" : "",
2592 aflags & 0x40 ? "T" : "",
2593 aflags & 0x20 ? "P" : "",
2594 aflags & 0x10 ? "E" : ""));
2595 if (aflags & 0xf)
2596 ND_PRINT((ndo, "+%x", aflags & 0xf));
2597 ND_PRINT((ndo, "]: "));
2598 }
2599 if (len < alen)
2600 goto trunc;
2601 if (length < alen)
2602 goto trunc;
2603 if (!bgp_attr_print(ndo, atype, p, alen, 0))
2604 goto trunc;
2605 p += alen;
2606 len -= alen;
2607 length -= alen;
2608 }
2609 }
2610
2611 if (length) {
2612 /*
2613 * XXX - what if they're using the "Advertisement of
2614 * Multiple Paths in BGP" feature:
2615 *
2616 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/
2617 *
2618 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06
2619 */
2620 ND_PRINT((ndo, "\n\t Updated routes:"));
2621 while (length) {
2622 char buf[MAXHOSTNAMELEN + 100];
2623 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2624 if (i == -1) {
2625 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2626 break;
2627 } else if (i == -2)
2628 goto trunc;
2629 else if (i == -3)
2630 goto trunc; /* bytes left, but not enough */
2631 else {
2632 ND_PRINT((ndo, "\n\t %s", buf));
2633 p += i;
2634 length -= i;
2635 }
2636 }
2637 }
2638 return;
2639 trunc:
2640 ND_PRINT((ndo, "%s", tstr));
2641 }
2642
2643 static void
2644 bgp_notification_print(netdissect_options *ndo,
2645 const u_char *dat, int length)
2646 {
2647 struct bgp_notification bgpn;
2648 const u_char *tptr;
2649
2650 ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
2651 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
2652
2653 /* some little sanity checking */
2654 if (length<BGP_NOTIFICATION_SIZE)
2655 return;
2656
2657 ND_PRINT((ndo, ", %s (%u)",
2658 tok2str(bgp_notify_major_values, "Unknown Error",
2659 bgpn.bgpn_major),
2660 bgpn.bgpn_major));
2661
2662 switch (bgpn.bgpn_major) {
2663
2664 case BGP_NOTIFY_MAJOR_MSG:
2665 ND_PRINT((ndo, ", subcode %s (%u)",
2666 tok2str(bgp_notify_minor_msg_values, "Unknown",
2667 bgpn.bgpn_minor),
2668 bgpn.bgpn_minor));
2669 break;
2670 case BGP_NOTIFY_MAJOR_OPEN:
2671 ND_PRINT((ndo, ", subcode %s (%u)",
2672 tok2str(bgp_notify_minor_open_values, "Unknown",
2673 bgpn.bgpn_minor),
2674 bgpn.bgpn_minor));
2675 break;
2676 case BGP_NOTIFY_MAJOR_UPDATE:
2677 ND_PRINT((ndo, ", subcode %s (%u)",
2678 tok2str(bgp_notify_minor_update_values, "Unknown",
2679 bgpn.bgpn_minor),
2680 bgpn.bgpn_minor));
2681 break;
2682 case BGP_NOTIFY_MAJOR_FSM:
2683 ND_PRINT((ndo, " subcode %s (%u)",
2684 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2685 bgpn.bgpn_minor),
2686 bgpn.bgpn_minor));
2687 break;
2688 case BGP_NOTIFY_MAJOR_CAP:
2689 ND_PRINT((ndo, " subcode %s (%u)",
2690 tok2str(bgp_notify_minor_cap_values, "Unknown",
2691 bgpn.bgpn_minor),
2692 bgpn.bgpn_minor));
2693 break;
2694 case BGP_NOTIFY_MAJOR_CEASE:
2695 ND_PRINT((ndo, ", subcode %s (%u)",
2696 tok2str(bgp_notify_minor_cease_values, "Unknown",
2697 bgpn.bgpn_minor),
2698 bgpn.bgpn_minor));
2699
2700 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2701 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2702 */
2703 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2704 tptr = dat + BGP_NOTIFICATION_SIZE;
2705 ND_TCHECK2(*tptr, 7);
2706 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2707 tok2str(af_values, "Unknown",
2708 EXTRACT_16BITS(tptr)),
2709 EXTRACT_16BITS(tptr),
2710 tok2str(bgp_safi_values, "Unknown", *(tptr+2)),
2711 *(tptr+2),
2712 EXTRACT_32BITS(tptr+3)));
2713 }
2714 break;
2715 default:
2716 break;
2717 }
2718
2719 return;
2720 trunc:
2721 ND_PRINT((ndo, "%s", tstr));
2722 }
2723
2724 static void
2725 bgp_route_refresh_print(netdissect_options *ndo,
2726 const u_char *pptr, int len)
2727 {
2728 const struct bgp_route_refresh *bgp_route_refresh_header;
2729
2730 ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE);
2731
2732 /* some little sanity checking */
2733 if (len<BGP_ROUTE_REFRESH_SIZE)
2734 return;
2735
2736 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2737
2738 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)",
2739 tok2str(af_values,"Unknown",
2740 /* this stinks but the compiler pads the structure
2741 * weird */
2742 EXTRACT_16BITS(&bgp_route_refresh_header->afi)),
2743 EXTRACT_16BITS(&bgp_route_refresh_header->afi),
2744 tok2str(bgp_safi_values,"Unknown",
2745 bgp_route_refresh_header->safi),
2746 bgp_route_refresh_header->safi));
2747
2748 if (ndo->ndo_vflag > 1) {
2749 ND_TCHECK2(*pptr, len);
2750 print_unknown_data(ndo, pptr, "\n\t ", len);
2751 }
2752
2753 return;
2754 trunc:
2755 ND_PRINT((ndo, "%s", tstr));
2756 }
2757
2758 static int
2759 bgp_header_print(netdissect_options *ndo,
2760 const u_char *dat, int length)
2761 {
2762 struct bgp bgp;
2763
2764 ND_TCHECK2(dat[0], BGP_SIZE);
2765 memcpy(&bgp, dat, BGP_SIZE);
2766 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2767 tok2str(bgp_msg_values, "Unknown", bgp.bgp_type),
2768 bgp.bgp_type,
2769 length));
2770
2771 switch (bgp.bgp_type) {
2772 case BGP_OPEN:
2773 bgp_open_print(ndo, dat, length);
2774 break;
2775 case BGP_UPDATE:
2776 bgp_update_print(ndo, dat, length);
2777 break;
2778 case BGP_NOTIFICATION:
2779 bgp_notification_print(ndo, dat, length);
2780 break;
2781 case BGP_KEEPALIVE:
2782 break;
2783 case BGP_ROUTE_REFRESH:
2784 bgp_route_refresh_print(ndo, dat, length);
2785 break;
2786 default:
2787 /* we have no decoder for the BGP message */
2788 ND_TCHECK2(*dat, length);
2789 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type));
2790 print_unknown_data(ndo, dat, "\n\t ", length);
2791 break;
2792 }
2793 return 1;
2794 trunc:
2795 ND_PRINT((ndo, "%s", tstr));
2796 return 0;
2797 }
2798
2799 void
2800 bgp_print(netdissect_options *ndo,
2801 const u_char *dat, int length)
2802 {
2803 const u_char *p;
2804 const u_char *ep;
2805 const u_char *start;
2806 const u_char marker[] = {
2807 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2808 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2809 };
2810 struct bgp bgp;
2811 uint16_t hlen;
2812
2813 ep = dat + length;
2814 if (ndo->ndo_snapend < dat + length)
2815 ep = ndo->ndo_snapend;
2816
2817 ND_PRINT((ndo, ": BGP"));
2818
2819 if (ndo->ndo_vflag < 1) /* lets be less chatty */
2820 return;
2821
2822 p = dat;
2823 start = p;
2824 while (p < ep) {
2825 if (!ND_TTEST2(p[0], 1))
2826 break;
2827 if (p[0] != 0xff) {
2828 p++;
2829 continue;
2830 }
2831
2832 if (!ND_TTEST2(p[0], sizeof(marker)))
2833 break;
2834 if (memcmp(p, marker, sizeof(marker)) != 0) {
2835 p++;
2836 continue;
2837 }
2838
2839 /* found BGP header */
2840 ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/
2841 memcpy(&bgp, p, BGP_SIZE);
2842
2843 if (start != p)
2844 ND_PRINT((ndo, " %s", tstr));
2845
2846 hlen = ntohs(bgp.bgp_len);
2847 if (hlen < BGP_SIZE) {
2848 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
2849 BGP_SIZE));
2850 break;
2851 }
2852
2853 if (ND_TTEST2(p[0], hlen)) {
2854 if (!bgp_header_print(ndo, p, hlen))
2855 return;
2856 p += hlen;
2857 start = p;
2858 } else {
2859 ND_PRINT((ndo, "\n[|BGP %s]",
2860 tok2str(bgp_msg_values,
2861 "Unknown Message Type",
2862 bgp.bgp_type)));
2863 break;
2864 }
2865 }
2866
2867 return;
2868
2869 trunc:
2870 ND_PRINT((ndo, "%s", tstr));
2871 }
2872
2873 /*
2874 * Local Variables:
2875 * c-style: whitesmith
2876 * c-basic-offset: 4
2877 * End:
2878 */
[mirror] the TCPdump network dissector