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NTP: Use tstr for truncation indicator.
[tcpdump] / print-bgp.c
1 /*
2 * Copyright (C) 1999 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * Extensively modified by Hannes Gredler (hannes@gredler.at) for more
30 * complete BGP support.
31 */
32
33 /* \summary: Border Gateway Protocol (BGP) printer */
34
35 #ifdef HAVE_CONFIG_H
36 #include "config.h"
37 #endif
38
39 #include <netdissect-stdinc.h>
40
41 #include <stdio.h>
42 #include <string.h>
43
44 #include "netdissect.h"
45 #include "addrtoname.h"
46 #include "extract.h"
47 #include "af.h"
48 #include "l2vpn.h"
49
50 struct bgp {
51 uint8_t bgp_marker[16];
52 uint16_t bgp_len;
53 uint8_t bgp_type;
54 };
55 #define BGP_SIZE 19 /* unaligned */
56
57 #define BGP_OPEN 1
58 #define BGP_UPDATE 2
59 #define BGP_NOTIFICATION 3
60 #define BGP_KEEPALIVE 4
61 #define BGP_ROUTE_REFRESH 5
62
63 static const struct tok bgp_msg_values[] = {
64 { BGP_OPEN, "Open"},
65 { BGP_UPDATE, "Update"},
66 { BGP_NOTIFICATION, "Notification"},
67 { BGP_KEEPALIVE, "Keepalive"},
68 { BGP_ROUTE_REFRESH, "Route Refresh"},
69 { 0, NULL}
70 };
71
72 struct bgp_open {
73 uint8_t bgpo_marker[16];
74 uint16_t bgpo_len;
75 uint8_t bgpo_type;
76 uint8_t bgpo_version;
77 uint16_t bgpo_myas;
78 uint16_t bgpo_holdtime;
79 uint32_t bgpo_id;
80 uint8_t bgpo_optlen;
81 /* options should follow */
82 };
83 #define BGP_OPEN_SIZE 29 /* unaligned */
84
85 struct bgp_opt {
86 uint8_t bgpopt_type;
87 uint8_t bgpopt_len;
88 /* variable length */
89 };
90 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
91 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
92
93 struct bgp_notification {
94 uint8_t bgpn_marker[16];
95 uint16_t bgpn_len;
96 uint8_t bgpn_type;
97 uint8_t bgpn_major;
98 uint8_t bgpn_minor;
99 };
100 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
101
102 struct bgp_route_refresh {
103 uint8_t bgp_marker[16];
104 uint16_t len;
105 uint8_t type;
106 uint8_t afi[2]; /* the compiler messes this structure up */
107 uint8_t res; /* when doing misaligned sequences of int8 and int16 */
108 uint8_t safi; /* afi should be int16 - so we have to access it using */
109 }; /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh) */
110 #define BGP_ROUTE_REFRESH_SIZE 23
111
112 #define bgp_attr_lenlen(flags, p) \
113 (((flags) & 0x10) ? 2 : 1)
114 #define bgp_attr_len(flags, p) \
115 (((flags) & 0x10) ? EXTRACT_16BITS(p) : *(p))
116
117 #define BGPTYPE_ORIGIN 1
118 #define BGPTYPE_AS_PATH 2
119 #define BGPTYPE_NEXT_HOP 3
120 #define BGPTYPE_MULTI_EXIT_DISC 4
121 #define BGPTYPE_LOCAL_PREF 5
122 #define BGPTYPE_ATOMIC_AGGREGATE 6
123 #define BGPTYPE_AGGREGATOR 7
124 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
125 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */
126 #define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */
127 #define BGPTYPE_DPA 11 /* deprecated, draft-ietf-idr-bgp-dpa */
128 #define BGPTYPE_ADVERTISERS 12 /* deprecated RFC1863 */
129 #define BGPTYPE_RCID_PATH 13 /* deprecated RFC1863 */
130 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */
131 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */
132 #define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */
133 #define BGPTYPE_AS4_PATH 17 /* RFC6793 */
134 #define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */
135 #define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */
136 #define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */
137 #define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */
138 #define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */
139 #define BGPTYPE_AIGP 26 /* RFC7311 */
140 #define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */
141 #define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */
142 #define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */
143 #define BGPTYPE_ATTR_SET 128 /* RFC6368 */
144
145 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
146
147 static const struct tok bgp_attr_values[] = {
148 { BGPTYPE_ORIGIN, "Origin"},
149 { BGPTYPE_AS_PATH, "AS Path"},
150 { BGPTYPE_AS4_PATH, "AS4 Path"},
151 { BGPTYPE_NEXT_HOP, "Next Hop"},
152 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
153 { BGPTYPE_LOCAL_PREF, "Local Preference"},
154 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
155 { BGPTYPE_AGGREGATOR, "Aggregator"},
156 { BGPTYPE_AGGREGATOR4, "Aggregator4"},
157 { BGPTYPE_COMMUNITIES, "Community"},
158 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
159 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
160 { BGPTYPE_DPA, "DPA"},
161 { BGPTYPE_ADVERTISERS, "Advertisers"},
162 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"},
163 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
164 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
165 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
166 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
167 { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"},
168 { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"},
169 { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
170 { BGPTYPE_AIGP, "Accumulated IGP Metric"},
171 { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
172 { BGPTYPE_ENTROPY_LABEL, "Entropy Label"},
173 { BGPTYPE_LARGE_COMMUNITY, "Large Community"},
174 { BGPTYPE_ATTR_SET, "Attribute Set"},
175 { 255, "Reserved for development"},
176 { 0, NULL}
177 };
178
179 #define BGP_AS_SET 1
180 #define BGP_AS_SEQUENCE 2
181 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
182 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
183
184 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
185 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
186
187 static const struct tok bgp_as_path_segment_open_values[] = {
188 { BGP_AS_SEQUENCE, ""},
189 { BGP_AS_SET, "{ "},
190 { BGP_CONFED_AS_SEQUENCE, "( "},
191 { BGP_CONFED_AS_SET, "({ "},
192 { 0, NULL}
193 };
194
195 static const struct tok bgp_as_path_segment_close_values[] = {
196 { BGP_AS_SEQUENCE, ""},
197 { BGP_AS_SET, "}"},
198 { BGP_CONFED_AS_SEQUENCE, ")"},
199 { BGP_CONFED_AS_SET, "})"},
200 { 0, NULL}
201 };
202
203 #define BGP_OPT_AUTH 1
204 #define BGP_OPT_CAP 2
205
206 static const struct tok bgp_opt_values[] = {
207 { BGP_OPT_AUTH, "Authentication Information"},
208 { BGP_OPT_CAP, "Capabilities Advertisement"},
209 { 0, NULL}
210 };
211
212 #define BGP_CAPCODE_MP 1 /* RFC2858 */
213 #define BGP_CAPCODE_RR 2 /* RFC2918 */
214 #define BGP_CAPCODE_ORF 3 /* RFC5291 */
215 #define BGP_CAPCODE_MR 4 /* RFC3107 */
216 #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */
217 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */
218 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
219 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
220 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
221 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
222 #define BGP_CAPCODE_ENH_RR 70 /* draft-keyur-bgp-enhanced-route-refresh */
223 #define BGP_CAPCODE_RR_CISCO 128
224
225 static const struct tok bgp_capcode_values[] = {
226 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
227 { BGP_CAPCODE_RR, "Route Refresh"},
228 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
229 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
230 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
231 { BGP_CAPCODE_RESTART, "Graceful Restart"},
232 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
233 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
234 { BGP_CAPCODE_MULTISESS, "Multisession BGP"},
235 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
236 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
237 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
238 { 0, NULL}
239 };
240
241 #define BGP_NOTIFY_MAJOR_MSG 1
242 #define BGP_NOTIFY_MAJOR_OPEN 2
243 #define BGP_NOTIFY_MAJOR_UPDATE 3
244 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
245 #define BGP_NOTIFY_MAJOR_FSM 5
246 #define BGP_NOTIFY_MAJOR_CEASE 6
247 #define BGP_NOTIFY_MAJOR_CAP 7
248
249 static const struct tok bgp_notify_major_values[] = {
250 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
251 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
252 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
253 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
254 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
255 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
256 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"},
257 { 0, NULL}
258 };
259
260 /* draft-ietf-idr-cease-subcode-02 */
261 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
262 /* draft-ietf-idr-shutdown-07 */
263 #define BGP_NOTIFY_MINOR_CEASE_SHUT 2
264 #define BGP_NOTIFY_MINOR_CEASE_RESET 4
265 #define BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN 128
266 static const struct tok bgp_notify_minor_cease_values[] = {
267 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
268 { BGP_NOTIFY_MINOR_CEASE_SHUT, "Administrative Shutdown"},
269 { 3, "Peer Unconfigured"},
270 { BGP_NOTIFY_MINOR_CEASE_RESET, "Administrative Reset"},
271 { 5, "Connection Rejected"},
272 { 6, "Other Configuration Change"},
273 { 7, "Connection Collision Resolution"},
274 { 0, NULL}
275 };
276
277 static const struct tok bgp_notify_minor_msg_values[] = {
278 { 1, "Connection Not Synchronized"},
279 { 2, "Bad Message Length"},
280 { 3, "Bad Message Type"},
281 { 0, NULL}
282 };
283
284 static const struct tok bgp_notify_minor_open_values[] = {
285 { 1, "Unsupported Version Number"},
286 { 2, "Bad Peer AS"},
287 { 3, "Bad BGP Identifier"},
288 { 4, "Unsupported Optional Parameter"},
289 { 5, "Authentication Failure"},
290 { 6, "Unacceptable Hold Time"},
291 { 7, "Capability Message Error"},
292 { 0, NULL}
293 };
294
295 static const struct tok bgp_notify_minor_update_values[] = {
296 { 1, "Malformed Attribute List"},
297 { 2, "Unrecognized Well-known Attribute"},
298 { 3, "Missing Well-known Attribute"},
299 { 4, "Attribute Flags Error"},
300 { 5, "Attribute Length Error"},
301 { 6, "Invalid ORIGIN Attribute"},
302 { 7, "AS Routing Loop"},
303 { 8, "Invalid NEXT_HOP Attribute"},
304 { 9, "Optional Attribute Error"},
305 { 10, "Invalid Network Field"},
306 { 11, "Malformed AS_PATH"},
307 { 0, NULL}
308 };
309
310 static const struct tok bgp_notify_minor_fsm_values[] = {
311 { 0, "Unspecified Error"},
312 { 1, "In OpenSent State"},
313 { 2, "In OpenConfirm State"},
314 { 3, "In Established State"},
315 { 0, NULL }
316 };
317
318 static const struct tok bgp_notify_minor_cap_values[] = {
319 { 1, "Invalid Action Value" },
320 { 2, "Invalid Capability Length" },
321 { 3, "Malformed Capability Value" },
322 { 4, "Unsupported Capability Code" },
323 { 0, NULL }
324 };
325
326 static const struct tok bgp_origin_values[] = {
327 { 0, "IGP"},
328 { 1, "EGP"},
329 { 2, "Incomplete"},
330 { 0, NULL}
331 };
332
333 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1
334 #define BGP_PMSI_TUNNEL_LDP_P2MP 2
335 #define BGP_PMSI_TUNNEL_PIM_SSM 3
336 #define BGP_PMSI_TUNNEL_PIM_SM 4
337 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5
338 #define BGP_PMSI_TUNNEL_INGRESS 6
339 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7
340
341 static const struct tok bgp_pmsi_tunnel_values[] = {
342 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
343 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
344 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
345 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
346 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
347 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
348 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
349 { 0, NULL}
350 };
351
352 static const struct tok bgp_pmsi_flag_values[] = {
353 { 0x01, "Leaf Information required"},
354 { 0, NULL}
355 };
356
357 #define BGP_AIGP_TLV 1
358
359 static const struct tok bgp_aigp_values[] = {
360 { BGP_AIGP_TLV, "AIGP"},
361 { 0, NULL}
362 };
363
364 /* Subsequent address family identifier, RFC2283 section 7 */
365 #define SAFNUM_RES 0
366 #define SAFNUM_UNICAST 1
367 #define SAFNUM_MULTICAST 2
368 #define SAFNUM_UNIMULTICAST 3 /* deprecated now */
369 /* labeled BGP RFC3107 */
370 #define SAFNUM_LABUNICAST 4
371 /* RFC6514 */
372 #define SAFNUM_MULTICAST_VPN 5
373 /* draft-nalawade-kapoor-tunnel-safi */
374 #define SAFNUM_TUNNEL 64
375 /* RFC4761 */
376 #define SAFNUM_VPLS 65
377 /* RFC6037 */
378 #define SAFNUM_MDT 66
379 /* RFC4364 */
380 #define SAFNUM_VPNUNICAST 128
381 /* RFC6513 */
382 #define SAFNUM_VPNMULTICAST 129
383 #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */
384 /* RFC4684 */
385 #define SAFNUM_RT_ROUTING_INFO 132
386
387 #define BGP_VPN_RD_LEN 8
388
389 static const struct tok bgp_safi_values[] = {
390 { SAFNUM_RES, "Reserved"},
391 { SAFNUM_UNICAST, "Unicast"},
392 { SAFNUM_MULTICAST, "Multicast"},
393 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
394 { SAFNUM_LABUNICAST, "labeled Unicast"},
395 { SAFNUM_TUNNEL, "Tunnel"},
396 { SAFNUM_VPLS, "VPLS"},
397 { SAFNUM_MDT, "MDT"},
398 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
399 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
400 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
401 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
402 { SAFNUM_MULTICAST_VPN, "Multicast VPN"},
403 { 0, NULL }
404 };
405
406 /* well-known community */
407 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
408 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
409 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
410
411 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */
412 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
413 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
414 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
415 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
416 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
417 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
418 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
419 /* rfc2547 bgp-mpls-vpns */
420 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
421 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatability */
422 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatability */
423 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatability */
424
425 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
426 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatability */
427
428 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
429 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatability */
430
431 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
432
433 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
434 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
435 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
436 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */
437
438 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */
439 #define BGP_EXT_COM_EIGRP_GEN 0x8800
440 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801
441 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
442 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803
443 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804
444 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
445
446 static const struct tok bgp_extd_comm_flag_values[] = {
447 { 0x8000, "vendor-specific"},
448 { 0x4000, "non-transitive"},
449 { 0, NULL},
450 };
451
452 static const struct tok bgp_extd_comm_subtype_values[] = {
453 { BGP_EXT_COM_RT_0, "target"},
454 { BGP_EXT_COM_RT_1, "target"},
455 { BGP_EXT_COM_RT_2, "target"},
456 { BGP_EXT_COM_RO_0, "origin"},
457 { BGP_EXT_COM_RO_1, "origin"},
458 { BGP_EXT_COM_RO_2, "origin"},
459 { BGP_EXT_COM_LINKBAND, "link-BW"},
460 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
461 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
462 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
463 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
464 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
465 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
466 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
467 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
468 { BGP_EXT_COM_L2INFO, "layer2-info"},
469 { BGP_EXT_COM_EIGRP_GEN , "eigrp-general-route (flag, tag)" },
470 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY , "eigrp-route-metric (AS, delay)" },
471 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW , "eigrp-route-metric (reliability, nexthop, bandwidth)" },
472 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU , "eigrp-route-metric (load, MTU)" },
473 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID , "eigrp-external-route (remote-AS, remote-ID)" },
474 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC , "eigrp-external-route (remote-proto, remote-metric)" },
475 { BGP_EXT_COM_SOURCE_AS, "source-AS" },
476 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
477 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
478 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
479 { 0, NULL},
480 };
481
482 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
483 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
484 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
485 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
486 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
487 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
488 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
489 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
490
491 static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
492 { BGP_OSPF_RTYPE_RTR, "Router" },
493 { BGP_OSPF_RTYPE_NET, "Network" },
494 { BGP_OSPF_RTYPE_SUM, "Summary" },
495 { BGP_OSPF_RTYPE_EXT, "External" },
496 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
497 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
498 { 0, NULL },
499 };
500
501 /* ADD-PATH Send/Receive field values */
502 static const struct tok bgp_add_path_recvsend[] = {
503 { 1, "Receive" },
504 { 2, "Send" },
505 { 3, "Both" },
506 { 0, NULL },
507 };
508
509 static char astostr[20];
510
511 /*
512 * as_printf
513 *
514 * Convert an AS number into a string and return string pointer.
515 *
516 * Depending on bflag is set or not, AS number is converted into ASDOT notation
517 * or plain number notation.
518 *
519 */
520 static char *
521 as_printf(netdissect_options *ndo,
522 char *str, int size, u_int asnum)
523 {
524 if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
525 snprintf(str, size, "%u", asnum);
526 } else {
527 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
528 }
529 return str;
530 }
531
532 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
533
534 int
535 decode_prefix4(netdissect_options *ndo,
536 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
537 {
538 struct in_addr addr;
539 u_int plen, plenbytes;
540
541 ND_TCHECK(pptr[0]);
542 ITEMCHECK(1);
543 plen = pptr[0];
544 if (32 < plen)
545 return -1;
546 itemlen -= 1;
547
548 memset(&addr, 0, sizeof(addr));
549 plenbytes = (plen + 7) / 8;
550 ND_TCHECK2(pptr[1], plenbytes);
551 ITEMCHECK(plenbytes);
552 memcpy(&addr, &pptr[1], plenbytes);
553 if (plen % 8) {
554 ((u_char *)&addr)[plenbytes - 1] &=
555 ((0xff00 >> (plen % 8)) & 0xff);
556 }
557 snprintf(buf, buflen, "%s/%d", ipaddr_string(ndo, &addr), plen);
558 return 1 + plenbytes;
559
560 trunc:
561 return -2;
562
563 badtlv:
564 return -3;
565 }
566
567 static int
568 decode_labeled_prefix4(netdissect_options *ndo,
569 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
570 {
571 struct in_addr addr;
572 u_int plen, plenbytes;
573
574 /* prefix length and label = 4 bytes */
575 ND_TCHECK2(pptr[0], 4);
576 ITEMCHECK(4);
577 plen = pptr[0]; /* get prefix length */
578
579 /* this is one of the weirdnesses of rfc3107
580 the label length (actually the label + COS bits)
581 is added to the prefix length;
582 we also do only read out just one label -
583 there is no real application for advertisement of
584 stacked labels in a single BGP message
585 */
586
587 if (24 > plen)
588 return -1;
589
590 plen-=24; /* adjust prefixlen - labellength */
591
592 if (32 < plen)
593 return -1;
594 itemlen -= 4;
595
596 memset(&addr, 0, sizeof(addr));
597 plenbytes = (plen + 7) / 8;
598 ND_TCHECK2(pptr[4], plenbytes);
599 ITEMCHECK(plenbytes);
600 memcpy(&addr, &pptr[4], plenbytes);
601 if (plen % 8) {
602 ((u_char *)&addr)[plenbytes - 1] &=
603 ((0xff00 >> (plen % 8)) & 0xff);
604 }
605 /* the label may get offsetted by 4 bits so lets shift it right */
606 snprintf(buf, buflen, "%s/%d, label:%u %s",
607 ipaddr_string(ndo, &addr),
608 plen,
609 EXTRACT_24BITS(pptr+1)>>4,
610 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
611
612 return 4 + plenbytes;
613
614 trunc:
615 return -2;
616
617 badtlv:
618 return -3;
619 }
620
621 /*
622 * bgp_vpn_ip_print
623 *
624 * print an ipv4 or ipv6 address into a buffer dependend on address length.
625 */
626 static char *
627 bgp_vpn_ip_print(netdissect_options *ndo,
628 const u_char *pptr, u_int addr_length)
629 {
630
631 /* worst case string is s fully formatted v6 address */
632 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
633 char *pos = addr;
634
635 switch(addr_length) {
636 case (sizeof(struct in_addr) << 3): /* 32 */
637 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
638 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
639 break;
640 case (sizeof(struct in6_addr) << 3): /* 128 */
641 ND_TCHECK2(pptr[0], sizeof(struct in6_addr));
642 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
643 break;
644 default:
645 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
646 break;
647 }
648 pos += strlen(pos);
649
650 trunc:
651 *(pos) = '\0';
652 return (addr);
653 }
654
655 /*
656 * bgp_vpn_sg_print
657 *
658 * print an multicast s,g entry into a buffer.
659 * the s,g entry is encoded like this.
660 *
661 * +-----------------------------------+
662 * | Multicast Source Length (1 octet) |
663 * +-----------------------------------+
664 * | Multicast Source (Variable) |
665 * +-----------------------------------+
666 * | Multicast Group Length (1 octet) |
667 * +-----------------------------------+
668 * | Multicast Group (Variable) |
669 * +-----------------------------------+
670 *
671 * return the number of bytes read from the wire.
672 */
673 static int
674 bgp_vpn_sg_print(netdissect_options *ndo,
675 const u_char *pptr, char *buf, u_int buflen)
676 {
677 uint8_t addr_length;
678 u_int total_length, offset;
679
680 total_length = 0;
681
682 /* Source address length, encoded in bits */
683 ND_TCHECK2(pptr[0], 1);
684 addr_length = *pptr++;
685
686 /* Source address */
687 ND_TCHECK2(pptr[0], (addr_length >> 3));
688 total_length += (addr_length >> 3) + 1;
689 offset = strlen(buf);
690 if (addr_length) {
691 snprintf(buf + offset, buflen - offset, ", Source %s",
692 bgp_vpn_ip_print(ndo, pptr, addr_length));
693 pptr += (addr_length >> 3);
694 }
695
696 /* Group address length, encoded in bits */
697 ND_TCHECK2(pptr[0], 1);
698 addr_length = *pptr++;
699
700 /* Group address */
701 ND_TCHECK2(pptr[0], (addr_length >> 3));
702 total_length += (addr_length >> 3) + 1;
703 offset = strlen(buf);
704 if (addr_length) {
705 snprintf(buf + offset, buflen - offset, ", Group %s",
706 bgp_vpn_ip_print(ndo, pptr, addr_length));
707 pptr += (addr_length >> 3);
708 }
709
710 trunc:
711 return (total_length);
712 }
713
714 /* RDs and RTs share the same semantics
715 * we use bgp_vpn_rd_print for
716 * printing route targets inside a NLRI */
717 char *
718 bgp_vpn_rd_print(netdissect_options *ndo,
719 const u_char *pptr)
720 {
721 /* allocate space for the largest possible string */
722 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
723 char *pos = rd;
724
725 /* ok lets load the RD format */
726 switch (EXTRACT_16BITS(pptr)) {
727
728 /* 2-byte-AS:number fmt*/
729 case 0:
730 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
731 EXTRACT_16BITS(pptr+2),
732 EXTRACT_32BITS(pptr+4),
733 *(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7));
734 break;
735 /* IP-address:AS fmt*/
736
737 case 1:
738 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
739 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6));
740 break;
741
742 /* 4-byte-AS:number fmt*/
743 case 2:
744 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
745 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+2)),
746 EXTRACT_16BITS(pptr+6), *(pptr+2), *(pptr+3), *(pptr+4),
747 *(pptr+5), EXTRACT_16BITS(pptr+6));
748 break;
749 default:
750 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
751 break;
752 }
753 pos += strlen(pos);
754 *(pos) = '\0';
755 return (rd);
756 }
757
758 static int
759 decode_rt_routing_info(netdissect_options *ndo,
760 const u_char *pptr, char *buf, u_int buflen)
761 {
762 uint8_t route_target[8];
763 u_int plen;
764
765 ND_TCHECK(pptr[0]);
766 plen = pptr[0]; /* get prefix length */
767
768 if (0 == plen) {
769 snprintf(buf, buflen, "default route target");
770 return 1;
771 }
772
773 if (32 > plen)
774 return -1;
775
776 plen-=32; /* adjust prefix length */
777
778 if (64 < plen)
779 return -1;
780
781 memset(&route_target, 0, sizeof(route_target));
782 ND_TCHECK2(pptr[1], (plen + 7) / 8);
783 memcpy(&route_target, &pptr[1], (plen + 7) / 8);
784 if (plen % 8) {
785 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
786 ((0xff00 >> (plen % 8)) & 0xff);
787 }
788 snprintf(buf, buflen, "origin AS: %s, route target %s",
789 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+1)),
790 bgp_vpn_rd_print(ndo, (u_char *)&route_target));
791
792 return 5 + (plen + 7) / 8;
793
794 trunc:
795 return -2;
796 }
797
798 static int
799 decode_labeled_vpn_prefix4(netdissect_options *ndo,
800 const u_char *pptr, char *buf, u_int buflen)
801 {
802 struct in_addr addr;
803 u_int plen;
804
805 ND_TCHECK(pptr[0]);
806 plen = pptr[0]; /* get prefix length */
807
808 if ((24+64) > plen)
809 return -1;
810
811 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
812
813 if (32 < plen)
814 return -1;
815
816 memset(&addr, 0, sizeof(addr));
817 ND_TCHECK2(pptr[12], (plen + 7) / 8);
818 memcpy(&addr, &pptr[12], (plen + 7) / 8);
819 if (plen % 8) {
820 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
821 ((0xff00 >> (plen % 8)) & 0xff);
822 }
823 /* the label may get offsetted by 4 bits so lets shift it right */
824 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
825 bgp_vpn_rd_print(ndo, pptr+4),
826 ipaddr_string(ndo, &addr),
827 plen,
828 EXTRACT_24BITS(pptr+1)>>4,
829 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
830
831 return 12 + (plen + 7) / 8;
832
833 trunc:
834 return -2;
835 }
836
837 /*
838 * +-------------------------------+
839 * | |
840 * | RD:IPv4-address (12 octets) |
841 * | |
842 * +-------------------------------+
843 * | MDT Group-address (4 octets) |
844 * +-------------------------------+
845 */
846
847 #define MDT_VPN_NLRI_LEN 16
848
849 static int
850 decode_mdt_vpn_nlri(netdissect_options *ndo,
851 const u_char *pptr, char *buf, u_int buflen)
852 {
853
854 const u_char *rd;
855 const u_char *vpn_ip;
856
857 ND_TCHECK(pptr[0]);
858
859 /* if the NLRI is not predefined length, quit.*/
860 if (*pptr != MDT_VPN_NLRI_LEN * 8)
861 return -1;
862 pptr++;
863
864 /* RD */
865 ND_TCHECK2(pptr[0], 8);
866 rd = pptr;
867 pptr+=8;
868
869 /* IPv4 address */
870 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
871 vpn_ip = pptr;
872 pptr+=sizeof(struct in_addr);
873
874 /* MDT Group Address */
875 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
876
877 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
878 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
879
880 return MDT_VPN_NLRI_LEN + 1;
881
882 trunc:
883
884 return -2;
885 }
886
887 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
888 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
889 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
890 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
891 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
892 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
893 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
894
895 static const struct tok bgp_multicast_vpn_route_type_values[] = {
896 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
897 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
898 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
899 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
900 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
901 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
902 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
903 };
904
905 static int
906 decode_multicast_vpn(netdissect_options *ndo,
907 const u_char *pptr, char *buf, u_int buflen)
908 {
909 uint8_t route_type, route_length, addr_length, sg_length;
910 u_int offset;
911
912 ND_TCHECK2(pptr[0], 2);
913 route_type = *pptr++;
914 route_length = *pptr++;
915
916 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
917 tok2str(bgp_multicast_vpn_route_type_values,
918 "Unknown", route_type),
919 route_type, route_length);
920
921 switch(route_type) {
922 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
923 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
924 offset = strlen(buf);
925 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
926 bgp_vpn_rd_print(ndo, pptr),
927 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
928 (route_length - BGP_VPN_RD_LEN) << 3));
929 break;
930 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
931 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4);
932 offset = strlen(buf);
933 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
934 bgp_vpn_rd_print(ndo, pptr),
935 as_printf(ndo, astostr, sizeof(astostr),
936 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
937 break;
938
939 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
940 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
941 offset = strlen(buf);
942 snprintf(buf + offset, buflen - offset, ", RD: %s",
943 bgp_vpn_rd_print(ndo, pptr));
944 pptr += BGP_VPN_RD_LEN;
945
946 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
947 addr_length = route_length - sg_length;
948
949 ND_TCHECK2(pptr[0], addr_length);
950 offset = strlen(buf);
951 snprintf(buf + offset, buflen - offset, ", Originator %s",
952 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
953 break;
954
955 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
956 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
957 offset = strlen(buf);
958 snprintf(buf + offset, buflen - offset, ", RD: %s",
959 bgp_vpn_rd_print(ndo, pptr));
960 pptr += BGP_VPN_RD_LEN;
961
962 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
963 break;
964
965 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
966 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
967 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
968 offset = strlen(buf);
969 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
970 bgp_vpn_rd_print(ndo, pptr),
971 as_printf(ndo, astostr, sizeof(astostr),
972 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
973 pptr += BGP_VPN_RD_LEN;
974
975 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
976 break;
977
978 /*
979 * no per route-type printing yet.
980 */
981 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
982 default:
983 break;
984 }
985
986 return route_length + 2;
987
988 trunc:
989 return -2;
990 }
991
992 /*
993 * As I remember, some versions of systems have an snprintf() that
994 * returns -1 if the buffer would have overflowed. If the return
995 * value is negative, set buflen to 0, to indicate that we've filled
996 * the buffer up.
997 *
998 * If the return value is greater than buflen, that means that
999 * the buffer would have overflowed; again, set buflen to 0 in
1000 * that case.
1001 */
1002 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1003 if (stringlen<0) \
1004 buflen=0; \
1005 else if ((u_int)stringlen>buflen) \
1006 buflen=0; \
1007 else { \
1008 buflen-=stringlen; \
1009 buf+=stringlen; \
1010 }
1011
1012 static int
1013 decode_labeled_vpn_l2(netdissect_options *ndo,
1014 const u_char *pptr, char *buf, u_int buflen)
1015 {
1016 int plen,tlen,stringlen,tlv_type,tlv_len,ttlv_len;
1017
1018 ND_TCHECK2(pptr[0], 2);
1019 plen=EXTRACT_16BITS(pptr);
1020 tlen=plen;
1021 pptr+=2;
1022 /* Old and new L2VPN NLRI share AFI/SAFI
1023 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1024 * and > 17 as old format. Complain for the middle case
1025 */
1026 if (plen==12) {
1027 /* assume AD-only with RD, BGPNH */
1028 ND_TCHECK2(pptr[0],12);
1029 buf[0]='\0';
1030 stringlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1031 bgp_vpn_rd_print(ndo, pptr),
1032 ipaddr_string(ndo, pptr+8)
1033 );
1034 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1035 pptr+=12;
1036 tlen-=12;
1037 return plen;
1038 } else if (plen>17) {
1039 /* assume old format */
1040 /* RD, ID, LBLKOFF, LBLBASE */
1041
1042 ND_TCHECK2(pptr[0],15);
1043 buf[0]='\0';
1044 stringlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1045 bgp_vpn_rd_print(ndo, pptr),
1046 EXTRACT_16BITS(pptr+8),
1047 EXTRACT_16BITS(pptr+10),
1048 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1049 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1050 pptr+=15;
1051 tlen-=15;
1052
1053 /* ok now the variable part - lets read out TLVs*/
1054 while (tlen>0) {
1055 if (tlen < 3)
1056 return -1;
1057 ND_TCHECK2(pptr[0], 3);
1058 tlv_type=*pptr++;
1059 tlv_len=EXTRACT_16BITS(pptr);
1060 ttlv_len=tlv_len;
1061 pptr+=2;
1062
1063 switch(tlv_type) {
1064 case 1:
1065 if (buflen!=0) {
1066 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1067 tlv_type,
1068 tlv_len);
1069 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1070 }
1071 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
1072 while (ttlv_len>0) {
1073 ND_TCHECK(pptr[0]);
1074 if (buflen!=0) {
1075 stringlen=snprintf(buf,buflen, "%02x",*pptr++);
1076 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1077 }
1078 ttlv_len--;
1079 }
1080 break;
1081 default:
1082 if (buflen!=0) {
1083 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1084 tlv_type,
1085 tlv_len);
1086 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1087 }
1088 break;
1089 }
1090 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
1091 }
1092 return plen+2;
1093
1094 } else {
1095 /* complain bitterly ? */
1096 /* fall through */
1097 goto trunc;
1098 }
1099
1100 trunc:
1101 return -2;
1102 }
1103
1104 int
1105 decode_prefix6(netdissect_options *ndo,
1106 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1107 {
1108 struct in6_addr addr;
1109 u_int plen, plenbytes;
1110
1111 ND_TCHECK(pd[0]);
1112 ITEMCHECK(1);
1113 plen = pd[0];
1114 if (128 < plen)
1115 return -1;
1116 itemlen -= 1;
1117
1118 memset(&addr, 0, sizeof(addr));
1119 plenbytes = (plen + 7) / 8;
1120 ND_TCHECK2(pd[1], plenbytes);
1121 ITEMCHECK(plenbytes);
1122 memcpy(&addr, &pd[1], plenbytes);
1123 if (plen % 8) {
1124 addr.s6_addr[plenbytes - 1] &=
1125 ((0xff00 >> (plen % 8)) & 0xff);
1126 }
1127 snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen);
1128 return 1 + plenbytes;
1129
1130 trunc:
1131 return -2;
1132
1133 badtlv:
1134 return -3;
1135 }
1136
1137 static int
1138 decode_labeled_prefix6(netdissect_options *ndo,
1139 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1140 {
1141 struct in6_addr addr;
1142 u_int plen, plenbytes;
1143
1144 /* prefix length and label = 4 bytes */
1145 ND_TCHECK2(pptr[0], 4);
1146 ITEMCHECK(4);
1147 plen = pptr[0]; /* get prefix length */
1148
1149 if (24 > plen)
1150 return -1;
1151
1152 plen-=24; /* adjust prefixlen - labellength */
1153
1154 if (128 < plen)
1155 return -1;
1156 itemlen -= 4;
1157
1158 memset(&addr, 0, sizeof(addr));
1159 plenbytes = (plen + 7) / 8;
1160 ND_TCHECK2(pptr[4], plenbytes);
1161 memcpy(&addr, &pptr[4], plenbytes);
1162 if (plen % 8) {
1163 addr.s6_addr[plenbytes - 1] &=
1164 ((0xff00 >> (plen % 8)) & 0xff);
1165 }
1166 /* the label may get offsetted by 4 bits so lets shift it right */
1167 snprintf(buf, buflen, "%s/%d, label:%u %s",
1168 ip6addr_string(ndo, &addr),
1169 plen,
1170 EXTRACT_24BITS(pptr+1)>>4,
1171 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1172
1173 return 4 + plenbytes;
1174
1175 trunc:
1176 return -2;
1177
1178 badtlv:
1179 return -3;
1180 }
1181
1182 static int
1183 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1184 const u_char *pptr, char *buf, u_int buflen)
1185 {
1186 struct in6_addr addr;
1187 u_int plen;
1188
1189 ND_TCHECK(pptr[0]);
1190 plen = pptr[0]; /* get prefix length */
1191
1192 if ((24+64) > plen)
1193 return -1;
1194
1195 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1196
1197 if (128 < plen)
1198 return -1;
1199
1200 memset(&addr, 0, sizeof(addr));
1201 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1202 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1203 if (plen % 8) {
1204 addr.s6_addr[(plen + 7) / 8 - 1] &=
1205 ((0xff00 >> (plen % 8)) & 0xff);
1206 }
1207 /* the label may get offsetted by 4 bits so lets shift it right */
1208 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1209 bgp_vpn_rd_print(ndo, pptr+4),
1210 ip6addr_string(ndo, &addr),
1211 plen,
1212 EXTRACT_24BITS(pptr+1)>>4,
1213 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1214
1215 return 12 + (plen + 7) / 8;
1216
1217 trunc:
1218 return -2;
1219 }
1220
1221 static int
1222 decode_clnp_prefix(netdissect_options *ndo,
1223 const u_char *pptr, char *buf, u_int buflen)
1224 {
1225 uint8_t addr[19];
1226 u_int plen;
1227
1228 ND_TCHECK(pptr[0]);
1229 plen = pptr[0]; /* get prefix length */
1230
1231 if (152 < plen)
1232 return -1;
1233
1234 memset(&addr, 0, sizeof(addr));
1235 ND_TCHECK2(pptr[4], (plen + 7) / 8);
1236 memcpy(&addr, &pptr[4], (plen + 7) / 8);
1237 if (plen % 8) {
1238 addr[(plen + 7) / 8 - 1] &=
1239 ((0xff00 >> (plen % 8)) & 0xff);
1240 }
1241 snprintf(buf, buflen, "%s/%d",
1242 isonsap_string(ndo, addr,(plen + 7) / 8),
1243 plen);
1244
1245 return 1 + (plen + 7) / 8;
1246
1247 trunc:
1248 return -2;
1249 }
1250
1251 static int
1252 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1253 const u_char *pptr, char *buf, u_int buflen)
1254 {
1255 uint8_t addr[19];
1256 u_int plen;
1257
1258 ND_TCHECK(pptr[0]);
1259 plen = pptr[0]; /* get prefix length */
1260
1261 if ((24+64) > plen)
1262 return -1;
1263
1264 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1265
1266 if (152 < plen)
1267 return -1;
1268
1269 memset(&addr, 0, sizeof(addr));
1270 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1271 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1272 if (plen % 8) {
1273 addr[(plen + 7) / 8 - 1] &=
1274 ((0xff00 >> (plen % 8)) & 0xff);
1275 }
1276 /* the label may get offsetted by 4 bits so lets shift it right */
1277 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1278 bgp_vpn_rd_print(ndo, pptr+4),
1279 isonsap_string(ndo, addr,(plen + 7) / 8),
1280 plen,
1281 EXTRACT_24BITS(pptr+1)>>4,
1282 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1283
1284 return 12 + (plen + 7) / 8;
1285
1286 trunc:
1287 return -2;
1288 }
1289
1290 /*
1291 * bgp_attr_get_as_size
1292 *
1293 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1294 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1295 * support, exchange AS-Path with the same path-attribute type value 0x02.
1296 */
1297 static int
1298 bgp_attr_get_as_size(netdissect_options *ndo,
1299 uint8_t bgpa_type, const u_char *pptr, int len)
1300 {
1301 const u_char *tptr = pptr;
1302
1303 /*
1304 * If the path attribute is the optional AS4 path type, then we already
1305 * know, that ASs must be encoded in 4 byte format.
1306 */
1307 if (bgpa_type == BGPTYPE_AS4_PATH) {
1308 return 4;
1309 }
1310
1311 /*
1312 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1313 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1314 * each.
1315 */
1316 while (tptr < pptr + len) {
1317 ND_TCHECK(tptr[0]);
1318
1319 /*
1320 * If we do not find a valid segment type, our guess might be wrong.
1321 */
1322 if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) {
1323 goto trunc;
1324 }
1325 ND_TCHECK(tptr[1]);
1326 tptr += 2 + tptr[1] * 2;
1327 }
1328
1329 /*
1330 * If we correctly reached end of the AS path attribute data content,
1331 * then most likely ASs were indeed encoded as 2 bytes.
1332 */
1333 if (tptr == pptr + len) {
1334 return 2;
1335 }
1336
1337 trunc:
1338
1339 /*
1340 * We can come here, either we did not have enough data, or if we
1341 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1342 * so that calller can try to decode each AS as of 4 bytes. If indeed
1343 * there was not enough data, it will crib and end the parse anyways.
1344 */
1345 return 4;
1346 }
1347
1348 static int
1349 bgp_attr_print(netdissect_options *ndo,
1350 u_int atype, const u_char *pptr, u_int len)
1351 {
1352 int i;
1353 uint16_t af;
1354 uint8_t safi, snpa, nhlen;
1355 union { /* copy buffer for bandwidth values */
1356 float f;
1357 uint32_t i;
1358 } bw;
1359 int advance;
1360 u_int tlen;
1361 const u_char *tptr;
1362 char buf[MAXHOSTNAMELEN + 100];
1363 int as_size;
1364
1365 tptr = pptr;
1366 tlen=len;
1367
1368 switch (atype) {
1369 case BGPTYPE_ORIGIN:
1370 if (len != 1)
1371 ND_PRINT((ndo, "invalid len"));
1372 else {
1373 ND_TCHECK(*tptr);
1374 ND_PRINT((ndo, "%s", tok2str(bgp_origin_values,
1375 "Unknown Origin Typecode",
1376 tptr[0])));
1377 }
1378 break;
1379
1380 /*
1381 * Process AS4 byte path and AS2 byte path attributes here.
1382 */
1383 case BGPTYPE_AS4_PATH:
1384 case BGPTYPE_AS_PATH:
1385 if (len % 2) {
1386 ND_PRINT((ndo, "invalid len"));
1387 break;
1388 }
1389 if (!len) {
1390 ND_PRINT((ndo, "empty"));
1391 break;
1392 }
1393
1394 /*
1395 * BGP updates exchanged between New speakers that support 4
1396 * byte AS, ASs are always encoded in 4 bytes. There is no
1397 * definitive way to find this, just by the packet's
1398 * contents. So, check for packet's TLV's sanity assuming
1399 * 2 bytes first, and it does not pass, assume that ASs are
1400 * encoded in 4 bytes format and move on.
1401 */
1402 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1403
1404 while (tptr < pptr + len) {
1405 ND_TCHECK(tptr[0]);
1406 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values,
1407 "?", tptr[0])));
1408 for (i = 0; i < tptr[1] * as_size; i += as_size) {
1409 ND_TCHECK2(tptr[2 + i], as_size);
1410 ND_PRINT((ndo, "%s ",
1411 as_printf(ndo, astostr, sizeof(astostr),
1412 as_size == 2 ?
1413 EXTRACT_16BITS(&tptr[2 + i]) :
1414 EXTRACT_32BITS(&tptr[2 + i]))));
1415 }
1416 ND_TCHECK(tptr[0]);
1417 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values,
1418 "?", tptr[0])));
1419 ND_TCHECK(tptr[1]);
1420 tptr += 2 + tptr[1] * as_size;
1421 }
1422 break;
1423 case BGPTYPE_NEXT_HOP:
1424 if (len != 4)
1425 ND_PRINT((ndo, "invalid len"));
1426 else {
1427 ND_TCHECK2(tptr[0], 4);
1428 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1429 }
1430 break;
1431 case BGPTYPE_MULTI_EXIT_DISC:
1432 case BGPTYPE_LOCAL_PREF:
1433 if (len != 4)
1434 ND_PRINT((ndo, "invalid len"));
1435 else {
1436 ND_TCHECK2(tptr[0], 4);
1437 ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr)));
1438 }
1439 break;
1440 case BGPTYPE_ATOMIC_AGGREGATE:
1441 if (len != 0)
1442 ND_PRINT((ndo, "invalid len"));
1443 break;
1444 case BGPTYPE_AGGREGATOR:
1445
1446 /*
1447 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1448 * the length of this PA can be either 6 bytes or 8 bytes.
1449 */
1450 if (len != 6 && len != 8) {
1451 ND_PRINT((ndo, "invalid len"));
1452 break;
1453 }
1454 ND_TCHECK2(tptr[0], len);
1455 if (len == 6) {
1456 ND_PRINT((ndo, " AS #%s, origin %s",
1457 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)),
1458 ipaddr_string(ndo, tptr + 2)));
1459 } else {
1460 ND_PRINT((ndo, " AS #%s, origin %s",
1461 as_printf(ndo, astostr, sizeof(astostr),
1462 EXTRACT_32BITS(tptr)), ipaddr_string(ndo, tptr + 4)));
1463 }
1464 break;
1465 case BGPTYPE_AGGREGATOR4:
1466 if (len != 8) {
1467 ND_PRINT((ndo, "invalid len"));
1468 break;
1469 }
1470 ND_TCHECK2(tptr[0], 8);
1471 ND_PRINT((ndo, " AS #%s, origin %s",
1472 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)),
1473 ipaddr_string(ndo, tptr + 4)));
1474 break;
1475 case BGPTYPE_COMMUNITIES:
1476 if (len % 4) {
1477 ND_PRINT((ndo, "invalid len"));
1478 break;
1479 }
1480 while (tlen>0) {
1481 uint32_t comm;
1482 ND_TCHECK2(tptr[0], 4);
1483 comm = EXTRACT_32BITS(tptr);
1484 switch (comm) {
1485 case BGP_COMMUNITY_NO_EXPORT:
1486 ND_PRINT((ndo, " NO_EXPORT"));
1487 break;
1488 case BGP_COMMUNITY_NO_ADVERT:
1489 ND_PRINT((ndo, " NO_ADVERTISE"));
1490 break;
1491 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1492 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1493 break;
1494 default:
1495 ND_PRINT((ndo, "%u:%u%s",
1496 (comm >> 16) & 0xffff,
1497 comm & 0xffff,
1498 (tlen>4) ? ", " : ""));
1499 break;
1500 }
1501 tlen -=4;
1502 tptr +=4;
1503 }
1504 break;
1505 case BGPTYPE_ORIGINATOR_ID:
1506 if (len != 4) {
1507 ND_PRINT((ndo, "invalid len"));
1508 break;
1509 }
1510 ND_TCHECK2(tptr[0], 4);
1511 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1512 break;
1513 case BGPTYPE_CLUSTER_LIST:
1514 if (len % 4) {
1515 ND_PRINT((ndo, "invalid len"));
1516 break;
1517 }
1518 while (tlen>0) {
1519 ND_TCHECK2(tptr[0], 4);
1520 ND_PRINT((ndo, "%s%s",
1521 ipaddr_string(ndo, tptr),
1522 (tlen>4) ? ", " : ""));
1523 tlen -=4;
1524 tptr +=4;
1525 }
1526 break;
1527 case BGPTYPE_MP_REACH_NLRI:
1528 ND_TCHECK2(tptr[0], 3);
1529 af = EXTRACT_16BITS(tptr);
1530 safi = tptr[2];
1531
1532 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1533 tok2str(af_values, "Unknown AFI", af),
1534 af,
1535 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1536 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1537 safi));
1538
1539 switch(af<<8 | safi) {
1540 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1541 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1542 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1543 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1544 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1545 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1546 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1547 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1548 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1549 case (AFNUM_INET<<8 | SAFNUM_MDT):
1550 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1551 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1552 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1553 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1554 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1555 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1556 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1557 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1558 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1559 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1560 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1561 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1562 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1563 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1564 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1565 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1566 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1567 break;
1568 default:
1569 ND_TCHECK2(tptr[0], tlen);
1570 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1571 if (ndo->ndo_vflag <= 1)
1572 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1573 goto done;
1574 break;
1575 }
1576
1577 tptr +=3;
1578
1579 ND_TCHECK(tptr[0]);
1580 nhlen = tptr[0];
1581 tlen = nhlen;
1582 tptr++;
1583
1584 if (tlen) {
1585 int nnh = 0;
1586 ND_PRINT((ndo, "\n\t nexthop: "));
1587 while (tlen > 0) {
1588 if ( nnh++ > 0 ) {
1589 ND_PRINT((ndo, ", " ));
1590 }
1591 switch(af<<8 | safi) {
1592 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1593 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1594 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1595 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1596 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1597 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1598 case (AFNUM_INET<<8 | SAFNUM_MDT):
1599 if (tlen < (int)sizeof(struct in_addr)) {
1600 ND_PRINT((ndo, "invalid len"));
1601 tlen = 0;
1602 } else {
1603 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1604 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1605 tlen -= sizeof(struct in_addr);
1606 tptr += sizeof(struct in_addr);
1607 }
1608 break;
1609 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1610 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1611 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1612 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) {
1613 ND_PRINT((ndo, "invalid len"));
1614 tlen = 0;
1615 } else {
1616 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1617 ND_PRINT((ndo, "RD: %s, %s",
1618 bgp_vpn_rd_print(ndo, tptr),
1619 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1620 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1621 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1622 }
1623 break;
1624 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1625 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1626 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1627 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1628 if (tlen < (int)sizeof(struct in6_addr)) {
1629 ND_PRINT((ndo, "invalid len"));
1630 tlen = 0;
1631 } else {
1632 ND_TCHECK2(tptr[0], sizeof(struct in6_addr));
1633 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr)));
1634 tlen -= sizeof(struct in6_addr);
1635 tptr += sizeof(struct in6_addr);
1636 }
1637 break;
1638 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1639 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1640 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1641 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) {
1642 ND_PRINT((ndo, "invalid len"));
1643 tlen = 0;
1644 } else {
1645 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1646 ND_PRINT((ndo, "RD: %s, %s",
1647 bgp_vpn_rd_print(ndo, tptr),
1648 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1649 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1650 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1651 }
1652 break;
1653 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1654 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1655 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1656 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1657 if (tlen < (int)sizeof(struct in_addr)) {
1658 ND_PRINT((ndo, "invalid len"));
1659 tlen = 0;
1660 } else {
1661 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1662 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1663 tlen -= (sizeof(struct in_addr));
1664 tptr += (sizeof(struct in_addr));
1665 }
1666 break;
1667 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1668 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1669 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1670 ND_TCHECK2(tptr[0], tlen);
1671 ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen)));
1672 tptr += tlen;
1673 tlen = 0;
1674 break;
1675
1676 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1677 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1678 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1679 if (tlen < BGP_VPN_RD_LEN+1) {
1680 ND_PRINT((ndo, "invalid len"));
1681 tlen = 0;
1682 } else {
1683 ND_TCHECK2(tptr[0], tlen);
1684 ND_PRINT((ndo, "RD: %s, %s",
1685 bgp_vpn_rd_print(ndo, tptr),
1686 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1687 /* rfc986 mapped IPv4 address ? */
1688 if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601)
1689 ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4)));
1690 /* rfc1888 mapped IPv6 address ? */
1691 else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000)
1692 ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3)));
1693 tptr += tlen;
1694 tlen = 0;
1695 }
1696 break;
1697 default:
1698 ND_TCHECK2(tptr[0], tlen);
1699 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1700 if (ndo->ndo_vflag <= 1)
1701 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1702 tptr += tlen;
1703 tlen = 0;
1704 goto done;
1705 break;
1706 }
1707 }
1708 }
1709 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1710 tptr += tlen;
1711
1712 ND_TCHECK(tptr[0]);
1713 snpa = tptr[0];
1714 tptr++;
1715
1716 if (snpa) {
1717 ND_PRINT((ndo, "\n\t %u SNPA", snpa));
1718 for (/*nothing*/; snpa > 0; snpa--) {
1719 ND_TCHECK(tptr[0]);
1720 ND_PRINT((ndo, "\n\t %d bytes", tptr[0]));
1721 tptr += tptr[0] + 1;
1722 }
1723 } else {
1724 ND_PRINT((ndo, ", no SNPA"));
1725 }
1726
1727 while (len - (tptr - pptr) > 0) {
1728 switch (af<<8 | safi) {
1729 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1730 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1731 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1732 advance = decode_prefix4(ndo, tptr, len, 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 if (advance == -3)
1738 break; /* bytes left, but not enough */
1739 else
1740 ND_PRINT((ndo, "\n\t %s", buf));
1741 break;
1742 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1743 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1744 if (advance == -1)
1745 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1746 else if (advance == -2)
1747 goto trunc;
1748 else if (advance == -3)
1749 break; /* bytes left, but not enough */
1750 else
1751 ND_PRINT((ndo, "\n\t %s", buf));
1752 break;
1753 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1754 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1755 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1756 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1757 if (advance == -1)
1758 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1759 else if (advance == -2)
1760 goto trunc;
1761 else
1762 ND_PRINT((ndo, "\n\t %s", buf));
1763 break;
1764 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1765 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf));
1766 if (advance == -1)
1767 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1768 else if (advance == -2)
1769 goto trunc;
1770 else
1771 ND_PRINT((ndo, "\n\t %s", buf));
1772 break;
1773 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1774 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1775 advance = decode_multicast_vpn(ndo, tptr, 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
1781 ND_PRINT((ndo, "\n\t %s", buf));
1782 break;
1783
1784 case (AFNUM_INET<<8 | SAFNUM_MDT):
1785 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1786 if (advance == -1)
1787 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1788 else if (advance == -2)
1789 goto trunc;
1790 else
1791 ND_PRINT((ndo, "\n\t %s", buf));
1792 break;
1793 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1794 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1795 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1796 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1797 if (advance == -1)
1798 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1799 else if (advance == -2)
1800 goto trunc;
1801 else if (advance == -3)
1802 break; /* bytes left, but not enough */
1803 else
1804 ND_PRINT((ndo, "\n\t %s", buf));
1805 break;
1806 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1807 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1808 if (advance == -1)
1809 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1810 else if (advance == -2)
1811 goto trunc;
1812 else if (advance == -3)
1813 break; /* bytes left, but not enough */
1814 else
1815 ND_PRINT((ndo, "\n\t %s", buf));
1816 break;
1817 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1818 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1819 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1820 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1821 if (advance == -1)
1822 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1823 else if (advance == -2)
1824 goto trunc;
1825 else
1826 ND_PRINT((ndo, "\n\t %s", buf));
1827 break;
1828 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1829 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1830 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1831 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1832 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1833 if (advance == -1)
1834 ND_PRINT((ndo, "\n\t (illegal length)"));
1835 else if (advance == -2)
1836 goto trunc;
1837 else
1838 ND_PRINT((ndo, "\n\t %s", buf));
1839 break;
1840 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1841 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1842 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1843 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1844 if (advance == -1)
1845 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1846 else if (advance == -2)
1847 goto trunc;
1848 else
1849 ND_PRINT((ndo, "\n\t %s", buf));
1850 break;
1851 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1852 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1853 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1854 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1855 if (advance == -1)
1856 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1857 else if (advance == -2)
1858 goto trunc;
1859 else
1860 ND_PRINT((ndo, "\n\t %s", buf));
1861 break;
1862 default:
1863 ND_TCHECK2(*tptr,tlen);
1864 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1865 if (ndo->ndo_vflag <= 1)
1866 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1867 advance = 0;
1868 tptr = pptr + len;
1869 break;
1870 }
1871 if (advance < 0)
1872 break;
1873 tptr += advance;
1874 }
1875 done:
1876 break;
1877
1878 case BGPTYPE_MP_UNREACH_NLRI:
1879 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE);
1880 af = EXTRACT_16BITS(tptr);
1881 safi = tptr[2];
1882
1883 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1884 tok2str(af_values, "Unknown AFI", af),
1885 af,
1886 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1887 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1888 safi));
1889
1890 if (len == BGP_MP_NLRI_MINSIZE)
1891 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
1892
1893 tptr += 3;
1894
1895 while (len - (tptr - pptr) > 0) {
1896 switch (af<<8 | safi) {
1897 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1898 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1899 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1900 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1901 if (advance == -1)
1902 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1903 else if (advance == -2)
1904 goto trunc;
1905 else if (advance == -3)
1906 break; /* bytes left, but not enough */
1907 else
1908 ND_PRINT((ndo, "\n\t %s", buf));
1909 break;
1910 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1911 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1912 if (advance == -1)
1913 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1914 else if (advance == -2)
1915 goto trunc;
1916 else if (advance == -3)
1917 break; /* bytes left, but not enough */
1918 else
1919 ND_PRINT((ndo, "\n\t %s", buf));
1920 break;
1921 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1922 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1923 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1924 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1925 if (advance == -1)
1926 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1927 else if (advance == -2)
1928 goto trunc;
1929 else
1930 ND_PRINT((ndo, "\n\t %s", buf));
1931 break;
1932 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1933 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1934 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1935 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1936 if (advance == -1)
1937 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1938 else if (advance == -2)
1939 goto trunc;
1940 else if (advance == -3)
1941 break; /* bytes left, but not enough */
1942 else
1943 ND_PRINT((ndo, "\n\t %s", buf));
1944 break;
1945 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1946 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1947 if (advance == -1)
1948 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1949 else if (advance == -2)
1950 goto trunc;
1951 else if (advance == -3)
1952 break; /* bytes left, but not enough */
1953 else
1954 ND_PRINT((ndo, "\n\t %s", buf));
1955 break;
1956 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1957 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1958 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1959 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1960 if (advance == -1)
1961 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1962 else if (advance == -2)
1963 goto trunc;
1964 else
1965 ND_PRINT((ndo, "\n\t %s", buf));
1966 break;
1967 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1968 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1969 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1970 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1971 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1972 if (advance == -1)
1973 ND_PRINT((ndo, "\n\t (illegal length)"));
1974 else if (advance == -2)
1975 goto trunc;
1976 else
1977 ND_PRINT((ndo, "\n\t %s", buf));
1978 break;
1979 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1980 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1981 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1982 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1983 if (advance == -1)
1984 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1985 else if (advance == -2)
1986 goto trunc;
1987 else
1988 ND_PRINT((ndo, "\n\t %s", buf));
1989 break;
1990 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1991 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1992 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1993 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1994 if (advance == -1)
1995 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1996 else if (advance == -2)
1997 goto trunc;
1998 else
1999 ND_PRINT((ndo, "\n\t %s", buf));
2000 break;
2001 case (AFNUM_INET<<8 | SAFNUM_MDT):
2002 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
2003 if (advance == -1)
2004 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2005 else if (advance == -2)
2006 goto trunc;
2007 else
2008 ND_PRINT((ndo, "\n\t %s", buf));
2009 break;
2010 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
2011 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
2012 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
2013 if (advance == -1)
2014 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2015 else if (advance == -2)
2016 goto trunc;
2017 else
2018 ND_PRINT((ndo, "\n\t %s", buf));
2019 break;
2020 default:
2021 ND_TCHECK2(*(tptr-3),tlen);
2022 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
2023 if (ndo->ndo_vflag <= 1)
2024 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
2025 advance = 0;
2026 tptr = pptr + len;
2027 break;
2028 }
2029 if (advance < 0)
2030 break;
2031 tptr += advance;
2032 }
2033 break;
2034 case BGPTYPE_EXTD_COMMUNITIES:
2035 if (len % 8) {
2036 ND_PRINT((ndo, "invalid len"));
2037 break;
2038 }
2039 while (tlen>0) {
2040 uint16_t extd_comm;
2041
2042 ND_TCHECK2(tptr[0], 2);
2043 extd_comm=EXTRACT_16BITS(tptr);
2044
2045 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]",
2046 tok2str(bgp_extd_comm_subtype_values,
2047 "unknown extd community typecode",
2048 extd_comm),
2049 extd_comm,
2050 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2051
2052 ND_TCHECK2(*(tptr+2), 6);
2053 switch(extd_comm) {
2054 case BGP_EXT_COM_RT_0:
2055 case BGP_EXT_COM_RO_0:
2056 case BGP_EXT_COM_L2VPN_RT_0:
2057 ND_PRINT((ndo, ": %u:%u (= %s)",
2058 EXTRACT_16BITS(tptr+2),
2059 EXTRACT_32BITS(tptr+4),
2060 ipaddr_string(ndo, tptr+4)));
2061 break;
2062 case BGP_EXT_COM_RT_1:
2063 case BGP_EXT_COM_RO_1:
2064 case BGP_EXT_COM_L2VPN_RT_1:
2065 case BGP_EXT_COM_VRF_RT_IMP:
2066 ND_PRINT((ndo, ": %s:%u",
2067 ipaddr_string(ndo, tptr+2),
2068 EXTRACT_16BITS(tptr+6)));
2069 break;
2070 case BGP_EXT_COM_RT_2:
2071 case BGP_EXT_COM_RO_2:
2072 ND_PRINT((ndo, ": %s:%u",
2073 as_printf(ndo, astostr, sizeof(astostr),
2074 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6)));
2075 break;
2076 case BGP_EXT_COM_LINKBAND:
2077 bw.i = EXTRACT_32BITS(tptr+2);
2078 ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2079 bw.f*8/1000000));
2080 break;
2081 case BGP_EXT_COM_VPN_ORIGIN:
2082 case BGP_EXT_COM_VPN_ORIGIN2:
2083 case BGP_EXT_COM_VPN_ORIGIN3:
2084 case BGP_EXT_COM_VPN_ORIGIN4:
2085 case BGP_EXT_COM_OSPF_RID:
2086 case BGP_EXT_COM_OSPF_RID2:
2087 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2)));
2088 break;
2089 case BGP_EXT_COM_OSPF_RTYPE:
2090 case BGP_EXT_COM_OSPF_RTYPE2:
2091 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2092 ipaddr_string(ndo, tptr+2),
2093 tok2str(bgp_extd_comm_ospf_rtype_values,
2094 "unknown (0x%02x)",
2095 *(tptr+6)),
2096 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2097 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2098 break;
2099 case BGP_EXT_COM_L2INFO:
2100 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2101 tok2str(l2vpn_encaps_values,
2102 "unknown encaps",
2103 *(tptr+2)),
2104 *(tptr+3),
2105 EXTRACT_16BITS(tptr+4)));
2106 break;
2107 case BGP_EXT_COM_SOURCE_AS:
2108 ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2)));
2109 break;
2110 default:
2111 ND_TCHECK2(*tptr,8);
2112 print_unknown_data(ndo, tptr, "\n\t ", 8);
2113 break;
2114 }
2115 tlen -=8;
2116 tptr +=8;
2117 }
2118 break;
2119
2120 case BGPTYPE_PMSI_TUNNEL:
2121 {
2122 uint8_t tunnel_type, flags;
2123
2124 tunnel_type = *(tptr+1);
2125 flags = *tptr;
2126 tlen = len;
2127
2128 ND_TCHECK2(tptr[0], 5);
2129 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2130 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2131 tunnel_type,
2132 bittok2str(bgp_pmsi_flag_values, "none", flags),
2133 EXTRACT_24BITS(tptr+2)>>4));
2134
2135 tptr +=5;
2136 tlen -= 5;
2137
2138 switch (tunnel_type) {
2139 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2140 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2141 ND_TCHECK2(tptr[0], 8);
2142 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s",
2143 ipaddr_string(ndo, tptr),
2144 ipaddr_string(ndo, tptr+4)));
2145 break;
2146
2147 case BGP_PMSI_TUNNEL_PIM_SSM:
2148 ND_TCHECK2(tptr[0], 8);
2149 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s",
2150 ipaddr_string(ndo, tptr),
2151 ipaddr_string(ndo, tptr+4)));
2152 break;
2153 case BGP_PMSI_TUNNEL_INGRESS:
2154 ND_TCHECK2(tptr[0], 4);
2155 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s",
2156 ipaddr_string(ndo, tptr)));
2157 break;
2158 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2159 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2160 ND_TCHECK2(tptr[0], 8);
2161 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x",
2162 ipaddr_string(ndo, tptr),
2163 EXTRACT_32BITS(tptr+4)));
2164 break;
2165 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2166 ND_TCHECK2(tptr[0], 8);
2167 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2168 ipaddr_string(ndo, tptr),
2169 EXTRACT_32BITS(tptr+4)));
2170 break;
2171 default:
2172 if (ndo->ndo_vflag <= 1) {
2173 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2174 }
2175 }
2176 break;
2177 }
2178 case BGPTYPE_AIGP:
2179 {
2180 uint8_t type;
2181 uint16_t length;
2182
2183 ND_TCHECK2(tptr[0], 3);
2184
2185 tlen = len;
2186
2187 while (tlen >= 3) {
2188
2189 type = *tptr;
2190 length = EXTRACT_16BITS(tptr+1);
2191
2192 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u",
2193 tok2str(bgp_aigp_values, "Unknown", type),
2194 type, length));
2195
2196 /*
2197 * Check if we can read the TLV data.
2198 */
2199 ND_TCHECK2(tptr[3], length - 3);
2200
2201 switch (type) {
2202
2203 case BGP_AIGP_TLV:
2204 ND_TCHECK2(tptr[3], 8);
2205 ND_PRINT((ndo, ", metric %" PRIu64,
2206 EXTRACT_64BITS(tptr+3)));
2207 break;
2208
2209 default:
2210 if (ndo->ndo_vflag <= 1) {
2211 print_unknown_data(ndo, tptr+3,"\n\t ", length-3);
2212 }
2213 }
2214
2215 tptr += length;
2216 tlen -= length;
2217 }
2218 break;
2219 }
2220 case BGPTYPE_ATTR_SET:
2221 ND_TCHECK2(tptr[0], 4);
2222 if (len < 4)
2223 goto trunc;
2224 ND_PRINT((ndo, "\n\t Origin AS: %s",
2225 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr))));
2226 tptr+=4;
2227 len -=4;
2228
2229 while (len) {
2230 u_int aflags, alenlen, alen;
2231
2232 ND_TCHECK2(tptr[0], 2);
2233 if (len < 2)
2234 goto trunc;
2235 aflags = *tptr;
2236 atype = *(tptr + 1);
2237 tptr += 2;
2238 len -= 2;
2239 alenlen = bgp_attr_lenlen(aflags, tptr);
2240 ND_TCHECK2(tptr[0], alenlen);
2241 if (len < alenlen)
2242 goto trunc;
2243 alen = bgp_attr_len(aflags, tptr);
2244 tptr += alenlen;
2245 len -= alenlen;
2246
2247 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2248 tok2str(bgp_attr_values,
2249 "Unknown Attribute", atype),
2250 atype,
2251 alen));
2252
2253 if (aflags) {
2254 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2255 aflags & 0x80 ? "O" : "",
2256 aflags & 0x40 ? "T" : "",
2257 aflags & 0x20 ? "P" : "",
2258 aflags & 0x10 ? "E" : ""));
2259 if (aflags & 0xf)
2260 ND_PRINT((ndo, "+%x", aflags & 0xf));
2261 ND_PRINT((ndo, "]: "));
2262 }
2263 /* FIXME check for recursion */
2264 if (!bgp_attr_print(ndo, atype, tptr, alen))
2265 return 0;
2266 tptr += alen;
2267 len -= alen;
2268 }
2269 break;
2270
2271 case BGPTYPE_LARGE_COMMUNITY:
2272 if (len == 0 || len % 12) {
2273 ND_PRINT((ndo, "invalid len"));
2274 break;
2275 }
2276 ND_PRINT((ndo, "\n\t "));
2277 while (len > 0) {
2278 ND_TCHECK2(*tptr, 12);
2279 ND_PRINT((ndo, "%u:%u:%u%s",
2280 EXTRACT_32BITS(tptr),
2281 EXTRACT_32BITS(tptr + 4),
2282 EXTRACT_32BITS(tptr + 8),
2283 (len > 12) ? ", " : ""));
2284 tptr += 12;
2285 len -= 12;
2286 }
2287 break;
2288 default:
2289 ND_TCHECK2(*pptr,len);
2290 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2291 if (ndo->ndo_vflag <= 1)
2292 print_unknown_data(ndo, pptr, "\n\t ", len);
2293 break;
2294 }
2295 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2296 ND_TCHECK2(*pptr,len);
2297 print_unknown_data(ndo, pptr, "\n\t ", len);
2298 }
2299 return 1;
2300
2301 trunc:
2302 return 0;
2303 }
2304
2305 static void
2306 bgp_capabilities_print(netdissect_options *ndo,
2307 const u_char *opt, int caps_len)
2308 {
2309 int cap_type, cap_len, tcap_len, cap_offset;
2310 int i = 0;
2311
2312 while (i < caps_len) {
2313 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE);
2314 cap_type=opt[i];
2315 cap_len=opt[i+1];
2316 tcap_len=cap_len;
2317 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2318 tok2str(bgp_capcode_values, "Unknown",
2319 cap_type),
2320 cap_type,
2321 cap_len));
2322 ND_TCHECK2(opt[i+2], cap_len);
2323 switch (cap_type) {
2324 case BGP_CAPCODE_MP:
2325 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2326 tok2str(af_values, "Unknown",
2327 EXTRACT_16BITS(opt+i+2)),
2328 EXTRACT_16BITS(opt+i+2),
2329 tok2str(bgp_safi_values, "Unknown",
2330 opt[i+5]),
2331 opt[i+5]));
2332 break;
2333 case BGP_CAPCODE_RESTART:
2334 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2335 ((opt[i+2])&0x80) ? "R" : "none",
2336 EXTRACT_16BITS(opt+i+2)&0xfff));
2337 tcap_len-=2;
2338 cap_offset=4;
2339 while(tcap_len>=4) {
2340 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2341 tok2str(af_values,"Unknown",
2342 EXTRACT_16BITS(opt+i+cap_offset)),
2343 EXTRACT_16BITS(opt+i+cap_offset),
2344 tok2str(bgp_safi_values,"Unknown",
2345 opt[i+cap_offset+2]),
2346 opt[i+cap_offset+2],
2347 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" ));
2348 tcap_len-=4;
2349 cap_offset+=4;
2350 }
2351 break;
2352 case BGP_CAPCODE_RR:
2353 case BGP_CAPCODE_RR_CISCO:
2354 break;
2355 case BGP_CAPCODE_AS_NEW:
2356
2357 /*
2358 * Extract the 4 byte AS number encoded.
2359 */
2360 if (cap_len == 4) {
2361 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2362 as_printf(ndo, astostr, sizeof(astostr),
2363 EXTRACT_32BITS(opt + i + 2))));
2364 }
2365 break;
2366 case BGP_CAPCODE_ADD_PATH:
2367 cap_offset=2;
2368 if (tcap_len == 0) {
2369 ND_PRINT((ndo, " (bogus)")); /* length */
2370 break;
2371 }
2372 while (tcap_len > 0) {
2373 if (tcap_len < 4) {
2374 ND_PRINT((ndo, "\n\t\t(invalid)"));
2375 break;
2376 }
2377 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2378 tok2str(af_values,"Unknown",EXTRACT_16BITS(opt+i+cap_offset)),
2379 EXTRACT_16BITS(opt+i+cap_offset),
2380 tok2str(bgp_safi_values,"Unknown",opt[i+cap_offset+2]),
2381 opt[i+cap_offset+2],
2382 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",opt[i+cap_offset+3])
2383 ));
2384 tcap_len-=4;
2385 cap_offset+=4;
2386 }
2387 break;
2388 default:
2389 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2390 cap_type));
2391 if (ndo->ndo_vflag <= 1)
2392 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2393 break;
2394 }
2395 if (ndo->ndo_vflag > 1 && cap_len > 0) {
2396 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2397 }
2398 i += BGP_CAP_HEADER_SIZE + cap_len;
2399 }
2400 return;
2401
2402 trunc:
2403 ND_PRINT((ndo, "[|BGP]"));
2404 }
2405
2406 static void
2407 bgp_open_print(netdissect_options *ndo,
2408 const u_char *dat, int length)
2409 {
2410 struct bgp_open bgpo;
2411 struct bgp_opt bgpopt;
2412 const u_char *opt;
2413 int i;
2414
2415 ND_TCHECK2(dat[0], BGP_OPEN_SIZE);
2416 memcpy(&bgpo, dat, BGP_OPEN_SIZE);
2417
2418 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version));
2419 ND_PRINT((ndo, "my AS %s, ",
2420 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas))));
2421 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime)));
2422 ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgpo.bgpo_id)));
2423 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen));
2424
2425 /* some little sanity checking */
2426 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE)
2427 return;
2428
2429 /* ugly! */
2430 opt = &((const struct bgp_open *)dat)->bgpo_optlen;
2431 opt++;
2432
2433 i = 0;
2434 while (i < bgpo.bgpo_optlen) {
2435 ND_TCHECK2(opt[i], BGP_OPT_SIZE);
2436 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE);
2437 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
2438 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len));
2439 break;
2440 }
2441
2442 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u",
2443 tok2str(bgp_opt_values,"Unknown",
2444 bgpopt.bgpopt_type),
2445 bgpopt.bgpopt_type,
2446 bgpopt.bgpopt_len));
2447
2448 /* now let's decode the options we know*/
2449 switch(bgpopt.bgpopt_type) {
2450
2451 case BGP_OPT_CAP:
2452 bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE],
2453 bgpopt.bgpopt_len);
2454 break;
2455
2456 case BGP_OPT_AUTH:
2457 default:
2458 ND_PRINT((ndo, "\n\t no decoder for option %u",
2459 bgpopt.bgpopt_type));
2460 break;
2461 }
2462 i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
2463 }
2464 return;
2465 trunc:
2466 ND_PRINT((ndo, "[|BGP]"));
2467 }
2468
2469 static void
2470 bgp_update_print(netdissect_options *ndo,
2471 const u_char *dat, int length)
2472 {
2473 struct bgp bgp;
2474 const u_char *p;
2475 int withdrawn_routes_len;
2476 int len;
2477 int i;
2478
2479 ND_TCHECK2(dat[0], BGP_SIZE);
2480 if (length < BGP_SIZE)
2481 goto trunc;
2482 memcpy(&bgp, dat, BGP_SIZE);
2483 p = dat + BGP_SIZE; /*XXX*/
2484 length -= BGP_SIZE;
2485
2486 /* Unfeasible routes */
2487 ND_TCHECK2(p[0], 2);
2488 if (length < 2)
2489 goto trunc;
2490 withdrawn_routes_len = EXTRACT_16BITS(p);
2491 p += 2;
2492 length -= 2;
2493 if (withdrawn_routes_len) {
2494 /*
2495 * Without keeping state from the original NLRI message,
2496 * it's not possible to tell if this a v4 or v6 route,
2497 * so only try to decode it if we're not v6 enabled.
2498 */
2499 ND_TCHECK2(p[0], withdrawn_routes_len);
2500 if (length < withdrawn_routes_len)
2501 goto trunc;
2502 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len));
2503 p += withdrawn_routes_len;
2504 length -= withdrawn_routes_len;
2505 }
2506
2507 ND_TCHECK2(p[0], 2);
2508 if (length < 2)
2509 goto trunc;
2510 len = EXTRACT_16BITS(p);
2511 p += 2;
2512 length -= 2;
2513
2514 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2515 /* No withdrawn routes, no path attributes, no NLRI */
2516 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2517 return;
2518 }
2519
2520 if (len) {
2521 /* do something more useful!*/
2522 while (len) {
2523 int aflags, atype, alenlen, alen;
2524
2525 ND_TCHECK2(p[0], 2);
2526 if (len < 2)
2527 goto trunc;
2528 if (length < 2)
2529 goto trunc;
2530 aflags = *p;
2531 atype = *(p + 1);
2532 p += 2;
2533 len -= 2;
2534 length -= 2;
2535 alenlen = bgp_attr_lenlen(aflags, p);
2536 ND_TCHECK2(p[0], alenlen);
2537 if (len < alenlen)
2538 goto trunc;
2539 if (length < alenlen)
2540 goto trunc;
2541 alen = bgp_attr_len(aflags, p);
2542 p += alenlen;
2543 len -= alenlen;
2544 length -= alenlen;
2545
2546 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2547 tok2str(bgp_attr_values, "Unknown Attribute",
2548 atype),
2549 atype,
2550 alen));
2551
2552 if (aflags) {
2553 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2554 aflags & 0x80 ? "O" : "",
2555 aflags & 0x40 ? "T" : "",
2556 aflags & 0x20 ? "P" : "",
2557 aflags & 0x10 ? "E" : ""));
2558 if (aflags & 0xf)
2559 ND_PRINT((ndo, "+%x", aflags & 0xf));
2560 ND_PRINT((ndo, "]: "));
2561 }
2562 if (len < alen)
2563 goto trunc;
2564 if (length < alen)
2565 goto trunc;
2566 if (!bgp_attr_print(ndo, atype, p, alen))
2567 goto trunc;
2568 p += alen;
2569 len -= alen;
2570 length -= alen;
2571 }
2572 }
2573
2574 if (length) {
2575 /*
2576 * XXX - what if they're using the "Advertisement of
2577 * Multiple Paths in BGP" feature:
2578 *
2579 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/
2580 *
2581 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06
2582 */
2583 ND_PRINT((ndo, "\n\t Updated routes:"));
2584 while (length) {
2585 char buf[MAXHOSTNAMELEN + 100];
2586 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2587 if (i == -1) {
2588 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2589 break;
2590 } else if (i == -2)
2591 goto trunc;
2592 else if (i == -3)
2593 goto trunc; /* bytes left, but not enough */
2594 else {
2595 ND_PRINT((ndo, "\n\t %s", buf));
2596 p += i;
2597 length -= i;
2598 }
2599 }
2600 }
2601 return;
2602 trunc:
2603 ND_PRINT((ndo, "[|BGP]"));
2604 }
2605
2606 static void
2607 bgp_notification_print(netdissect_options *ndo,
2608 const u_char *dat, int length)
2609 {
2610 struct bgp_notification bgpn;
2611 const u_char *tptr;
2612 uint8_t shutdown_comm_length;
2613 uint8_t remainder_offset;
2614
2615 ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
2616 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
2617
2618 /* some little sanity checking */
2619 if (length<BGP_NOTIFICATION_SIZE)
2620 return;
2621
2622 ND_PRINT((ndo, ", %s (%u)",
2623 tok2str(bgp_notify_major_values, "Unknown Error",
2624 bgpn.bgpn_major),
2625 bgpn.bgpn_major));
2626
2627 switch (bgpn.bgpn_major) {
2628
2629 case BGP_NOTIFY_MAJOR_MSG:
2630 ND_PRINT((ndo, ", subcode %s (%u)",
2631 tok2str(bgp_notify_minor_msg_values, "Unknown",
2632 bgpn.bgpn_minor),
2633 bgpn.bgpn_minor));
2634 break;
2635 case BGP_NOTIFY_MAJOR_OPEN:
2636 ND_PRINT((ndo, ", subcode %s (%u)",
2637 tok2str(bgp_notify_minor_open_values, "Unknown",
2638 bgpn.bgpn_minor),
2639 bgpn.bgpn_minor));
2640 break;
2641 case BGP_NOTIFY_MAJOR_UPDATE:
2642 ND_PRINT((ndo, ", subcode %s (%u)",
2643 tok2str(bgp_notify_minor_update_values, "Unknown",
2644 bgpn.bgpn_minor),
2645 bgpn.bgpn_minor));
2646 break;
2647 case BGP_NOTIFY_MAJOR_FSM:
2648 ND_PRINT((ndo, " subcode %s (%u)",
2649 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2650 bgpn.bgpn_minor),
2651 bgpn.bgpn_minor));
2652 break;
2653 case BGP_NOTIFY_MAJOR_CAP:
2654 ND_PRINT((ndo, " subcode %s (%u)",
2655 tok2str(bgp_notify_minor_cap_values, "Unknown",
2656 bgpn.bgpn_minor),
2657 bgpn.bgpn_minor));
2658 break;
2659 case BGP_NOTIFY_MAJOR_CEASE:
2660 ND_PRINT((ndo, ", subcode %s (%u)",
2661 tok2str(bgp_notify_minor_cease_values, "Unknown",
2662 bgpn.bgpn_minor),
2663 bgpn.bgpn_minor));
2664
2665 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2666 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2667 */
2668 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2669 tptr = dat + BGP_NOTIFICATION_SIZE;
2670 ND_TCHECK2(*tptr, 7);
2671 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2672 tok2str(af_values, "Unknown",
2673 EXTRACT_16BITS(tptr)),
2674 EXTRACT_16BITS(tptr),
2675 tok2str(bgp_safi_values, "Unknown", *(tptr+2)),
2676 *(tptr+2),
2677 EXTRACT_32BITS(tptr+3)));
2678 }
2679 /*
2680 * draft-ietf-idr-shutdown describes a method to send a communication
2681 * intended for human consumption regarding the Administrative Shutdown
2682 */
2683 if ((bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
2684 bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
2685 length >= BGP_NOTIFICATION_SIZE + 1) {
2686 tptr = dat + BGP_NOTIFICATION_SIZE;
2687 ND_TCHECK2(*tptr, 1);
2688 shutdown_comm_length = *(tptr);
2689 remainder_offset = 0;
2690 /* garbage, hexdump it all */
2691 if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN ||
2692 shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) {
2693 ND_PRINT((ndo, ", invalid Shutdown Communication length"));
2694 }
2695 else if (shutdown_comm_length == 0) {
2696 ND_PRINT((ndo, ", empty Shutdown Communication"));
2697 remainder_offset += 1;
2698 }
2699 /* a proper shutdown communication */
2700 else {
2701 ND_TCHECK2(*(tptr+1), shutdown_comm_length);
2702 ND_PRINT((ndo, ", Shutdown Communication (length: %u): \"", shutdown_comm_length));
2703 (void)fn_printn(ndo, tptr+1, shutdown_comm_length, NULL);
2704 ND_PRINT((ndo, "\""));
2705 remainder_offset += shutdown_comm_length + 1;
2706 }
2707 /* if there is trailing data, hexdump it */
2708 if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) {
2709 ND_PRINT((ndo, ", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE)));
2710 hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2711 }
2712 }
2713 break;
2714 default:
2715 break;
2716 }
2717
2718 return;
2719 trunc:
2720 ND_PRINT((ndo, "[|BGP]"));
2721 }
2722
2723 static void
2724 bgp_route_refresh_print(netdissect_options *ndo,
2725 const u_char *pptr, int len)
2726 {
2727 const struct bgp_route_refresh *bgp_route_refresh_header;
2728
2729 ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE);
2730
2731 /* some little sanity checking */
2732 if (len<BGP_ROUTE_REFRESH_SIZE)
2733 return;
2734
2735 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2736
2737 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)",
2738 tok2str(af_values,"Unknown",
2739 /* this stinks but the compiler pads the structure
2740 * weird */
2741 EXTRACT_16BITS(&bgp_route_refresh_header->afi)),
2742 EXTRACT_16BITS(&bgp_route_refresh_header->afi),
2743 tok2str(bgp_safi_values,"Unknown",
2744 bgp_route_refresh_header->safi),
2745 bgp_route_refresh_header->safi));
2746
2747 if (ndo->ndo_vflag > 1) {
2748 ND_TCHECK2(*pptr, len);
2749 print_unknown_data(ndo, pptr, "\n\t ", len);
2750 }
2751
2752 return;
2753 trunc:
2754 ND_PRINT((ndo, "[|BGP]"));
2755 }
2756
2757 static int
2758 bgp_header_print(netdissect_options *ndo,
2759 const u_char *dat, int length)
2760 {
2761 struct bgp bgp;
2762
2763 ND_TCHECK2(dat[0], BGP_SIZE);
2764 memcpy(&bgp, dat, BGP_SIZE);
2765 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2766 tok2str(bgp_msg_values, "Unknown", bgp.bgp_type),
2767 bgp.bgp_type,
2768 length));
2769
2770 switch (bgp.bgp_type) {
2771 case BGP_OPEN:
2772 bgp_open_print(ndo, dat, length);
2773 break;
2774 case BGP_UPDATE:
2775 bgp_update_print(ndo, dat, length);
2776 break;
2777 case BGP_NOTIFICATION:
2778 bgp_notification_print(ndo, dat, length);
2779 break;
2780 case BGP_KEEPALIVE:
2781 break;
2782 case BGP_ROUTE_REFRESH:
2783 bgp_route_refresh_print(ndo, dat, length);
2784 break;
2785 default:
2786 /* we have no decoder for the BGP message */
2787 ND_TCHECK2(*dat, length);
2788 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type));
2789 print_unknown_data(ndo, dat, "\n\t ", length);
2790 break;
2791 }
2792 return 1;
2793 trunc:
2794 ND_PRINT((ndo, "[|BGP]"));
2795 return 0;
2796 }
2797
2798 void
2799 bgp_print(netdissect_options *ndo,
2800 const u_char *dat, int length)
2801 {
2802 const u_char *p;
2803 const u_char *ep;
2804 const u_char *start;
2805 const u_char marker[] = {
2806 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2807 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2808 };
2809 struct bgp bgp;
2810 uint16_t hlen;
2811
2812 ep = dat + length;
2813 if (ndo->ndo_snapend < dat + length)
2814 ep = ndo->ndo_snapend;
2815
2816 ND_PRINT((ndo, ": BGP"));
2817
2818 if (ndo->ndo_vflag < 1) /* lets be less chatty */
2819 return;
2820
2821 p = dat;
2822 start = p;
2823 while (p < ep) {
2824 if (!ND_TTEST2(p[0], 1))
2825 break;
2826 if (p[0] != 0xff) {
2827 p++;
2828 continue;
2829 }
2830
2831 if (!ND_TTEST2(p[0], sizeof(marker)))
2832 break;
2833 if (memcmp(p, marker, sizeof(marker)) != 0) {
2834 p++;
2835 continue;
2836 }
2837
2838 /* found BGP header */
2839 ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/
2840 memcpy(&bgp, p, BGP_SIZE);
2841
2842 if (start != p)
2843 ND_PRINT((ndo, " [|BGP]"));
2844
2845 hlen = ntohs(bgp.bgp_len);
2846 if (hlen < BGP_SIZE) {
2847 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
2848 BGP_SIZE));
2849 break;
2850 }
2851
2852 if (ND_TTEST2(p[0], hlen)) {
2853 if (!bgp_header_print(ndo, p, hlen))
2854 return;
2855 p += hlen;
2856 start = p;
2857 } else {
2858 ND_PRINT((ndo, "\n[|BGP %s]",
2859 tok2str(bgp_msg_values,
2860 "Unknown Message Type",
2861 bgp.bgp_type)));
2862 break;
2863 }
2864 }
2865
2866 return;
2867
2868 trunc:
2869 ND_PRINT((ndo, " [|BGP]"));
2870 }
2871
2872 /*
2873 * Local Variables:
2874 * c-style: whitesmith
2875 * c-basic-offset: 4
2876 * End:
2877 */
[mirror] the TCPdump network dissector