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Use nd_ types in AppleTalk structures, and add EXTRACT_ calls.
[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_BE_U_2(&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_BE_U_2(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 compatibility */
422 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatibility */
423 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatibility */
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 compatibility */
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 compatibility */
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_1(pptr);
542 ITEMCHECK(1);
543 plen = EXTRACT_U_1(pptr);
544 if (32 < plen)
545 return -1;
546 itemlen -= 1;
547
548 memset(&addr, 0, sizeof(addr));
549 plenbytes = (plen + 7) / 8;
550 ND_TCHECK_LEN(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_TCHECK_4(pptr);
576 ITEMCHECK(4);
577 plen = EXTRACT_U_1(pptr); /* 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_TCHECK_LEN(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_BE_U_3(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_TCHECK_LEN(pptr, 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_TCHECK_LEN(pptr, 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_TCHECK_1(pptr);
684 addr_length = EXTRACT_U_1(pptr);
685 pptr++;
686
687 /* Source address */
688 ND_TCHECK_LEN(pptr, (addr_length >> 3));
689 total_length += (addr_length >> 3) + 1;
690 offset = strlen(buf);
691 if (addr_length) {
692 snprintf(buf + offset, buflen - offset, ", Source %s",
693 bgp_vpn_ip_print(ndo, pptr, addr_length));
694 pptr += (addr_length >> 3);
695 }
696
697 /* Group address length, encoded in bits */
698 ND_TCHECK_1(pptr);
699 addr_length = EXTRACT_U_1(pptr);
700 pptr++;
701
702 /* Group address */
703 ND_TCHECK_LEN(pptr, (addr_length >> 3));
704 total_length += (addr_length >> 3) + 1;
705 offset = strlen(buf);
706 if (addr_length) {
707 snprintf(buf + offset, buflen - offset, ", Group %s",
708 bgp_vpn_ip_print(ndo, pptr, addr_length));
709 pptr += (addr_length >> 3);
710 }
711
712 trunc:
713 return (total_length);
714 }
715
716 /* RDs and RTs share the same semantics
717 * we use bgp_vpn_rd_print for
718 * printing route targets inside a NLRI */
719 char *
720 bgp_vpn_rd_print(netdissect_options *ndo,
721 const u_char *pptr)
722 {
723 /* allocate space for the largest possible string */
724 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
725 char *pos = rd;
726
727 /* ok lets load the RD format */
728 switch (EXTRACT_BE_U_2(pptr)) {
729
730 /* 2-byte-AS:number fmt*/
731 case 0:
732 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
733 EXTRACT_BE_U_2(pptr + 2),
734 EXTRACT_BE_U_4(pptr + 4),
735 EXTRACT_U_1(pptr + 4), EXTRACT_U_1(pptr + 5),
736 EXTRACT_U_1(pptr + 6), EXTRACT_U_1(pptr + 7));
737 break;
738 /* IP-address:AS fmt*/
739
740 case 1:
741 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
742 EXTRACT_U_1(pptr + 2), EXTRACT_U_1(pptr + 3),
743 EXTRACT_U_1(pptr + 4), EXTRACT_U_1(pptr + 5),
744 EXTRACT_BE_U_2(pptr + 6));
745 break;
746
747 /* 4-byte-AS:number fmt*/
748 case 2:
749 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
750 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(pptr + 2)),
751 EXTRACT_BE_U_2(pptr + 6), EXTRACT_U_1(pptr + 2),
752 EXTRACT_U_1(pptr + 3), EXTRACT_U_1(pptr + 4),
753 EXTRACT_U_1(pptr + 5), EXTRACT_BE_U_2(pptr + 6));
754 break;
755 default:
756 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
757 break;
758 }
759 pos += strlen(pos);
760 *(pos) = '\0';
761 return (rd);
762 }
763
764 static int
765 decode_rt_routing_info(netdissect_options *ndo,
766 const u_char *pptr, char *buf, u_int buflen)
767 {
768 uint8_t route_target[8];
769 u_int plen;
770 char asbuf[sizeof(astostr)]; /* bgp_vpn_rd_print() overwrites astostr */
771
772 /* NLRI "prefix length" from RFC 2858 Section 4. */
773 ND_TCHECK_1(pptr);
774 plen = EXTRACT_U_1(pptr); /* get prefix length */
775
776 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
777 * RFC 4684 Section 4 defines the layout of "origin AS" and "route
778 * target" fields inside the "prefix" depending on its length.
779 */
780 if (0 == plen) {
781 /* Without "origin AS", without "route target". */
782 snprintf(buf, buflen, "default route target");
783 return 1;
784 }
785
786 if (32 > plen)
787 return -1;
788
789 /* With at least "origin AS", possibly with "route target". */
790 ND_TCHECK_4(pptr + 1);
791 as_printf(ndo, asbuf, sizeof(asbuf), EXTRACT_BE_U_4(pptr + 1));
792
793 plen-=32; /* adjust prefix length */
794
795 if (64 < plen)
796 return -1;
797
798 /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 }
799 * and gives the number of octets in the variable-length "route
800 * target" field inside this NLRI "prefix". Look for it.
801 */
802 memset(&route_target, 0, sizeof(route_target));
803 ND_TCHECK_LEN(pptr + 5, (plen + 7) / 8);
804 memcpy(&route_target, pptr + 5, (plen + 7) / 8);
805 /* Which specification says to do this? */
806 if (plen % 8) {
807 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
808 ((0xff00 >> (plen % 8)) & 0xff);
809 }
810 snprintf(buf, buflen, "origin AS: %s, route target %s",
811 asbuf,
812 bgp_vpn_rd_print(ndo, (u_char *)&route_target));
813
814 return 5 + (plen + 7) / 8;
815
816 trunc:
817 return -2;
818 }
819
820 static int
821 decode_labeled_vpn_prefix4(netdissect_options *ndo,
822 const u_char *pptr, char *buf, u_int buflen)
823 {
824 struct in_addr addr;
825 u_int plen;
826
827 ND_TCHECK_1(pptr);
828 plen = EXTRACT_U_1(pptr); /* get prefix length */
829
830 if ((24+64) > plen)
831 return -1;
832
833 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
834
835 if (32 < plen)
836 return -1;
837
838 memset(&addr, 0, sizeof(addr));
839 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
840 memcpy(&addr, pptr + 12, (plen + 7) / 8);
841 if (plen % 8) {
842 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
843 ((0xff00 >> (plen % 8)) & 0xff);
844 }
845 /* the label may get offsetted by 4 bits so lets shift it right */
846 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
847 bgp_vpn_rd_print(ndo, pptr+4),
848 ipaddr_string(ndo, &addr),
849 plen,
850 EXTRACT_BE_U_3(pptr + 1)>>4,
851 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
852
853 return 12 + (plen + 7) / 8;
854
855 trunc:
856 return -2;
857 }
858
859 /*
860 * +-------------------------------+
861 * | |
862 * | RD:IPv4-address (12 octets) |
863 * | |
864 * +-------------------------------+
865 * | MDT Group-address (4 octets) |
866 * +-------------------------------+
867 */
868
869 #define MDT_VPN_NLRI_LEN 16
870
871 static int
872 decode_mdt_vpn_nlri(netdissect_options *ndo,
873 const u_char *pptr, char *buf, u_int buflen)
874 {
875
876 const u_char *rd;
877 const u_char *vpn_ip;
878
879 ND_TCHECK_1(pptr);
880
881 /* if the NLRI is not predefined length, quit.*/
882 if (EXTRACT_U_1(pptr) != MDT_VPN_NLRI_LEN * 8)
883 return -1;
884 pptr++;
885
886 /* RD */
887 ND_TCHECK_8(pptr);
888 rd = pptr;
889 pptr+=8;
890
891 /* IPv4 address */
892 ND_TCHECK_LEN(pptr, sizeof(struct in_addr));
893 vpn_ip = pptr;
894 pptr+=sizeof(struct in_addr);
895
896 /* MDT Group Address */
897 ND_TCHECK_LEN(pptr, sizeof(struct in_addr));
898
899 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
900 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
901
902 return MDT_VPN_NLRI_LEN + 1;
903
904 trunc:
905
906 return -2;
907 }
908
909 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
910 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
911 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
912 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
913 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
914 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
915 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
916
917 static const struct tok bgp_multicast_vpn_route_type_values[] = {
918 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
919 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
920 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
921 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
922 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
923 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
924 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
925 { 0, NULL}
926 };
927
928 static int
929 decode_multicast_vpn(netdissect_options *ndo,
930 const u_char *pptr, char *buf, u_int buflen)
931 {
932 uint8_t route_type, route_length, addr_length, sg_length;
933 u_int offset;
934
935 ND_TCHECK_2(pptr);
936 route_type = EXTRACT_U_1(pptr);
937 pptr++;
938 route_length = EXTRACT_U_1(pptr);
939 pptr++;
940
941 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
942 tok2str(bgp_multicast_vpn_route_type_values,
943 "Unknown", route_type),
944 route_type, route_length);
945
946 switch(route_type) {
947 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
948 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
949 offset = strlen(buf);
950 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
951 bgp_vpn_rd_print(ndo, pptr),
952 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
953 (route_length - BGP_VPN_RD_LEN) << 3));
954 break;
955 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
956 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
957 offset = strlen(buf);
958 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
959 bgp_vpn_rd_print(ndo, pptr),
960 as_printf(ndo, astostr, sizeof(astostr),
961 EXTRACT_BE_U_4(pptr + BGP_VPN_RD_LEN)));
962 break;
963
964 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
965 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
966 offset = strlen(buf);
967 snprintf(buf + offset, buflen - offset, ", RD: %s",
968 bgp_vpn_rd_print(ndo, pptr));
969 pptr += BGP_VPN_RD_LEN;
970
971 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
972 addr_length = route_length - sg_length;
973
974 ND_TCHECK_LEN(pptr, addr_length);
975 offset = strlen(buf);
976 snprintf(buf + offset, buflen - offset, ", Originator %s",
977 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
978 break;
979
980 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
981 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
982 offset = strlen(buf);
983 snprintf(buf + offset, buflen - offset, ", RD: %s",
984 bgp_vpn_rd_print(ndo, pptr));
985 pptr += BGP_VPN_RD_LEN;
986
987 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
988 break;
989
990 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
991 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
992 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
993 offset = strlen(buf);
994 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
995 bgp_vpn_rd_print(ndo, pptr),
996 as_printf(ndo, astostr, sizeof(astostr),
997 EXTRACT_BE_U_4(pptr + BGP_VPN_RD_LEN)));
998 pptr += BGP_VPN_RD_LEN + 4;
999
1000 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1001 break;
1002
1003 /*
1004 * no per route-type printing yet.
1005 */
1006 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
1007 default:
1008 break;
1009 }
1010
1011 return route_length + 2;
1012
1013 trunc:
1014 return -2;
1015 }
1016
1017 /*
1018 * As I remember, some versions of systems have an snprintf() that
1019 * returns -1 if the buffer would have overflowed. If the return
1020 * value is negative, set buflen to 0, to indicate that we've filled
1021 * the buffer up.
1022 *
1023 * If the return value is greater than buflen, that means that
1024 * the buffer would have overflowed; again, set buflen to 0 in
1025 * that case.
1026 */
1027 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1028 if (stringlen<0) \
1029 buflen=0; \
1030 else if ((u_int)stringlen>buflen) \
1031 buflen=0; \
1032 else { \
1033 buflen-=stringlen; \
1034 buf+=stringlen; \
1035 }
1036
1037 static int
1038 decode_labeled_vpn_l2(netdissect_options *ndo,
1039 const u_char *pptr, char *buf, u_int buflen)
1040 {
1041 int plen,tlen,stringlen,tlv_type,tlv_len,ttlv_len;
1042
1043 ND_TCHECK_2(pptr);
1044 plen=EXTRACT_BE_U_2(pptr);
1045 tlen=plen;
1046 pptr+=2;
1047 /* Old and new L2VPN NLRI share AFI/SAFI
1048 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1049 * and > 17 as old format. Complain for the middle case
1050 */
1051 if (plen==12) {
1052 /* assume AD-only with RD, BGPNH */
1053 ND_TCHECK_LEN(pptr, 12);
1054 buf[0]='\0';
1055 stringlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1056 bgp_vpn_rd_print(ndo, pptr),
1057 ipaddr_string(ndo, pptr+8)
1058 );
1059 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1060 pptr+=12;
1061 tlen-=12;
1062 return plen;
1063 } else if (plen>17) {
1064 /* assume old format */
1065 /* RD, ID, LBLKOFF, LBLBASE */
1066
1067 ND_TCHECK_LEN(pptr, 15);
1068 buf[0]='\0';
1069 stringlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1070 bgp_vpn_rd_print(ndo, pptr),
1071 EXTRACT_BE_U_2(pptr + 8),
1072 EXTRACT_BE_U_2(pptr + 10),
1073 EXTRACT_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1074 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1075 pptr+=15;
1076 tlen-=15;
1077
1078 /* ok now the variable part - lets read out TLVs*/
1079 while (tlen>0) {
1080 if (tlen < 3)
1081 return -1;
1082 ND_TCHECK_3(pptr);
1083 tlv_type=EXTRACT_U_1(pptr);
1084 pptr++;
1085 tlv_len=EXTRACT_BE_U_2(pptr);
1086 ttlv_len=tlv_len;
1087 pptr+=2;
1088
1089 switch(tlv_type) {
1090 case 1:
1091 if (buflen!=0) {
1092 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1093 tlv_type,
1094 tlv_len);
1095 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1096 }
1097 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
1098 while (ttlv_len>0) {
1099 ND_TCHECK_1(pptr);
1100 if (buflen!=0) {
1101 stringlen=snprintf(buf,buflen, "%02x",
1102 EXTRACT_U_1(pptr));
1103 pptr++;
1104 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1105 }
1106 ttlv_len--;
1107 }
1108 break;
1109 default:
1110 if (buflen!=0) {
1111 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1112 tlv_type,
1113 tlv_len);
1114 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1115 }
1116 break;
1117 }
1118 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
1119 }
1120 return plen+2;
1121
1122 } else {
1123 /* complain bitterly ? */
1124 /* fall through */
1125 goto trunc;
1126 }
1127
1128 trunc:
1129 return -2;
1130 }
1131
1132 int
1133 decode_prefix6(netdissect_options *ndo,
1134 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1135 {
1136 struct in6_addr addr;
1137 u_int plen, plenbytes;
1138
1139 ND_TCHECK_1(pd);
1140 ITEMCHECK(1);
1141 plen = EXTRACT_U_1(pd);
1142 if (128 < plen)
1143 return -1;
1144 itemlen -= 1;
1145
1146 memset(&addr, 0, sizeof(addr));
1147 plenbytes = (plen + 7) / 8;
1148 ND_TCHECK_LEN(pd + 1, plenbytes);
1149 ITEMCHECK(plenbytes);
1150 memcpy(&addr, pd + 1, plenbytes);
1151 if (plen % 8) {
1152 addr.s6_addr[plenbytes - 1] &=
1153 ((0xff00 >> (plen % 8)) & 0xff);
1154 }
1155 snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen);
1156 return 1 + plenbytes;
1157
1158 trunc:
1159 return -2;
1160
1161 badtlv:
1162 return -3;
1163 }
1164
1165 static int
1166 decode_labeled_prefix6(netdissect_options *ndo,
1167 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1168 {
1169 struct in6_addr addr;
1170 u_int plen, plenbytes;
1171
1172 /* prefix length and label = 4 bytes */
1173 ND_TCHECK_4(pptr);
1174 ITEMCHECK(4);
1175 plen = EXTRACT_U_1(pptr); /* get prefix length */
1176
1177 if (24 > plen)
1178 return -1;
1179
1180 plen-=24; /* adjust prefixlen - labellength */
1181
1182 if (128 < plen)
1183 return -1;
1184 itemlen -= 4;
1185
1186 memset(&addr, 0, sizeof(addr));
1187 plenbytes = (plen + 7) / 8;
1188 ND_TCHECK_LEN(pptr + 4, plenbytes);
1189 memcpy(&addr, pptr + 4, plenbytes);
1190 if (plen % 8) {
1191 addr.s6_addr[plenbytes - 1] &=
1192 ((0xff00 >> (plen % 8)) & 0xff);
1193 }
1194 /* the label may get offsetted by 4 bits so lets shift it right */
1195 snprintf(buf, buflen, "%s/%d, label:%u %s",
1196 ip6addr_string(ndo, &addr),
1197 plen,
1198 EXTRACT_BE_U_3(pptr + 1)>>4,
1199 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1200
1201 return 4 + plenbytes;
1202
1203 trunc:
1204 return -2;
1205
1206 badtlv:
1207 return -3;
1208 }
1209
1210 static int
1211 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1212 const u_char *pptr, char *buf, u_int buflen)
1213 {
1214 struct in6_addr addr;
1215 u_int plen;
1216
1217 ND_TCHECK_1(pptr);
1218 plen = EXTRACT_U_1(pptr); /* get prefix length */
1219
1220 if ((24+64) > plen)
1221 return -1;
1222
1223 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1224
1225 if (128 < plen)
1226 return -1;
1227
1228 memset(&addr, 0, sizeof(addr));
1229 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1230 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1231 if (plen % 8) {
1232 addr.s6_addr[(plen + 7) / 8 - 1] &=
1233 ((0xff00 >> (plen % 8)) & 0xff);
1234 }
1235 /* the label may get offsetted by 4 bits so lets shift it right */
1236 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1237 bgp_vpn_rd_print(ndo, pptr+4),
1238 ip6addr_string(ndo, &addr),
1239 plen,
1240 EXTRACT_BE_U_3(pptr + 1)>>4,
1241 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1242
1243 return 12 + (plen + 7) / 8;
1244
1245 trunc:
1246 return -2;
1247 }
1248
1249 static int
1250 decode_clnp_prefix(netdissect_options *ndo,
1251 const u_char *pptr, char *buf, u_int buflen)
1252 {
1253 uint8_t addr[19];
1254 u_int plen;
1255
1256 ND_TCHECK_1(pptr);
1257 plen = EXTRACT_U_1(pptr); /* get prefix length */
1258
1259 if (152 < plen)
1260 return -1;
1261
1262 memset(&addr, 0, sizeof(addr));
1263 ND_TCHECK_LEN(pptr + 4, (plen + 7) / 8);
1264 memcpy(&addr, pptr + 4, (plen + 7) / 8);
1265 if (plen % 8) {
1266 addr[(plen + 7) / 8 - 1] &=
1267 ((0xff00 >> (plen % 8)) & 0xff);
1268 }
1269 snprintf(buf, buflen, "%s/%d",
1270 isonsap_string(ndo, addr,(plen + 7) / 8),
1271 plen);
1272
1273 return 1 + (plen + 7) / 8;
1274
1275 trunc:
1276 return -2;
1277 }
1278
1279 static int
1280 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1281 const u_char *pptr, char *buf, u_int buflen)
1282 {
1283 uint8_t addr[19];
1284 u_int plen;
1285
1286 ND_TCHECK_1(pptr);
1287 plen = EXTRACT_U_1(pptr); /* get prefix length */
1288
1289 if ((24+64) > plen)
1290 return -1;
1291
1292 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1293
1294 if (152 < plen)
1295 return -1;
1296
1297 memset(&addr, 0, sizeof(addr));
1298 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1299 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1300 if (plen % 8) {
1301 addr[(plen + 7) / 8 - 1] &=
1302 ((0xff00 >> (plen % 8)) & 0xff);
1303 }
1304 /* the label may get offsetted by 4 bits so lets shift it right */
1305 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1306 bgp_vpn_rd_print(ndo, pptr+4),
1307 isonsap_string(ndo, addr,(plen + 7) / 8),
1308 plen,
1309 EXTRACT_BE_U_3(pptr + 1)>>4,
1310 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1311
1312 return 12 + (plen + 7) / 8;
1313
1314 trunc:
1315 return -2;
1316 }
1317
1318 /*
1319 * bgp_attr_get_as_size
1320 *
1321 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1322 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1323 * support, exchange AS-Path with the same path-attribute type value 0x02.
1324 */
1325 static int
1326 bgp_attr_get_as_size(netdissect_options *ndo,
1327 uint8_t bgpa_type, const u_char *pptr, int len)
1328 {
1329 const u_char *tptr = pptr;
1330
1331 /*
1332 * If the path attribute is the optional AS4 path type, then we already
1333 * know, that ASs must be encoded in 4 byte format.
1334 */
1335 if (bgpa_type == BGPTYPE_AS4_PATH) {
1336 return 4;
1337 }
1338
1339 /*
1340 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1341 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1342 * each.
1343 */
1344 while (tptr < pptr + len) {
1345 ND_TCHECK_1(tptr);
1346
1347 /*
1348 * If we do not find a valid segment type, our guess might be wrong.
1349 */
1350 if (EXTRACT_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || EXTRACT_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
1351 goto trunc;
1352 }
1353 ND_TCHECK_1(tptr + 1);
1354 tptr += 2 + EXTRACT_U_1(tptr + 1) * 2;
1355 }
1356
1357 /*
1358 * If we correctly reached end of the AS path attribute data content,
1359 * then most likely ASs were indeed encoded as 2 bytes.
1360 */
1361 if (tptr == pptr + len) {
1362 return 2;
1363 }
1364
1365 trunc:
1366
1367 /*
1368 * We can come here, either we did not have enough data, or if we
1369 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1370 * so that calller can try to decode each AS as of 4 bytes. If indeed
1371 * there was not enough data, it will crib and end the parse anyways.
1372 */
1373 return 4;
1374 }
1375
1376 static int
1377 bgp_attr_print(netdissect_options *ndo,
1378 u_int atype, const u_char *pptr, u_int len)
1379 {
1380 int i;
1381 uint16_t af;
1382 uint8_t safi, snpa, nhlen;
1383 union { /* copy buffer for bandwidth values */
1384 float f;
1385 uint32_t i;
1386 } bw;
1387 int advance;
1388 u_int tlen;
1389 const u_char *tptr;
1390 char buf[MAXHOSTNAMELEN + 100];
1391 int as_size;
1392
1393 tptr = pptr;
1394 tlen=len;
1395
1396 switch (atype) {
1397 case BGPTYPE_ORIGIN:
1398 if (len != 1)
1399 ND_PRINT((ndo, "invalid len"));
1400 else {
1401 ND_TCHECK_1(tptr);
1402 ND_PRINT((ndo, "%s", tok2str(bgp_origin_values,
1403 "Unknown Origin Typecode",
1404 EXTRACT_U_1(tptr))));
1405 }
1406 break;
1407
1408 /*
1409 * Process AS4 byte path and AS2 byte path attributes here.
1410 */
1411 case BGPTYPE_AS4_PATH:
1412 case BGPTYPE_AS_PATH:
1413 if (len % 2) {
1414 ND_PRINT((ndo, "invalid len"));
1415 break;
1416 }
1417 if (!len) {
1418 ND_PRINT((ndo, "empty"));
1419 break;
1420 }
1421
1422 /*
1423 * BGP updates exchanged between New speakers that support 4
1424 * byte AS, ASs are always encoded in 4 bytes. There is no
1425 * definitive way to find this, just by the packet's
1426 * contents. So, check for packet's TLV's sanity assuming
1427 * 2 bytes first, and it does not pass, assume that ASs are
1428 * encoded in 4 bytes format and move on.
1429 */
1430 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1431
1432 while (tptr < pptr + len) {
1433 ND_TCHECK_1(tptr);
1434 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values,
1435 "?", EXTRACT_U_1(tptr))));
1436 ND_TCHECK_1(tptr + 1);
1437 for (i = 0; i < tptr[1] * as_size; i += as_size) {
1438 ND_TCHECK_LEN(tptr + 2 + i, as_size);
1439 ND_PRINT((ndo, "%s ",
1440 as_printf(ndo, astostr, sizeof(astostr),
1441 as_size == 2 ?
1442 EXTRACT_BE_U_2(tptr + i + 2) :
1443 EXTRACT_BE_U_4(tptr + i + 2))));
1444 }
1445 ND_TCHECK_1(tptr);
1446 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values,
1447 "?", EXTRACT_U_1(tptr))));
1448 ND_TCHECK_1(tptr + 1);
1449 tptr += 2 + EXTRACT_U_1(tptr + 1) * as_size;
1450 }
1451 break;
1452 case BGPTYPE_NEXT_HOP:
1453 if (len != 4)
1454 ND_PRINT((ndo, "invalid len"));
1455 else {
1456 ND_TCHECK_4(tptr);
1457 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1458 }
1459 break;
1460 case BGPTYPE_MULTI_EXIT_DISC:
1461 case BGPTYPE_LOCAL_PREF:
1462 if (len != 4)
1463 ND_PRINT((ndo, "invalid len"));
1464 else {
1465 ND_TCHECK_4(tptr);
1466 ND_PRINT((ndo, "%u", EXTRACT_BE_U_4(tptr)));
1467 }
1468 break;
1469 case BGPTYPE_ATOMIC_AGGREGATE:
1470 if (len != 0)
1471 ND_PRINT((ndo, "invalid len"));
1472 break;
1473 case BGPTYPE_AGGREGATOR:
1474
1475 /*
1476 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1477 * the length of this PA can be either 6 bytes or 8 bytes.
1478 */
1479 if (len != 6 && len != 8) {
1480 ND_PRINT((ndo, "invalid len"));
1481 break;
1482 }
1483 ND_TCHECK_LEN(tptr, len);
1484 if (len == 6) {
1485 ND_PRINT((ndo, " AS #%s, origin %s",
1486 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(tptr)),
1487 ipaddr_string(ndo, tptr + 2)));
1488 } else {
1489 ND_PRINT((ndo, " AS #%s, origin %s",
1490 as_printf(ndo, astostr, sizeof(astostr),
1491 EXTRACT_BE_U_4(tptr)), ipaddr_string(ndo, tptr + 4)));
1492 }
1493 break;
1494 case BGPTYPE_AGGREGATOR4:
1495 if (len != 8) {
1496 ND_PRINT((ndo, "invalid len"));
1497 break;
1498 }
1499 ND_TCHECK_8(tptr);
1500 ND_PRINT((ndo, " AS #%s, origin %s",
1501 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr)),
1502 ipaddr_string(ndo, tptr + 4)));
1503 break;
1504 case BGPTYPE_COMMUNITIES:
1505 if (len % 4) {
1506 ND_PRINT((ndo, "invalid len"));
1507 break;
1508 }
1509 while (tlen>0) {
1510 uint32_t comm;
1511 ND_TCHECK_4(tptr);
1512 comm = EXTRACT_BE_U_4(tptr);
1513 switch (comm) {
1514 case BGP_COMMUNITY_NO_EXPORT:
1515 ND_PRINT((ndo, " NO_EXPORT"));
1516 break;
1517 case BGP_COMMUNITY_NO_ADVERT:
1518 ND_PRINT((ndo, " NO_ADVERTISE"));
1519 break;
1520 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1521 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1522 break;
1523 default:
1524 ND_PRINT((ndo, "%u:%u%s",
1525 (comm >> 16) & 0xffff,
1526 comm & 0xffff,
1527 (tlen>4) ? ", " : ""));
1528 break;
1529 }
1530 tlen -=4;
1531 tptr +=4;
1532 }
1533 break;
1534 case BGPTYPE_ORIGINATOR_ID:
1535 if (len != 4) {
1536 ND_PRINT((ndo, "invalid len"));
1537 break;
1538 }
1539 ND_TCHECK_4(tptr);
1540 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1541 break;
1542 case BGPTYPE_CLUSTER_LIST:
1543 if (len % 4) {
1544 ND_PRINT((ndo, "invalid len"));
1545 break;
1546 }
1547 while (tlen>0) {
1548 ND_TCHECK_4(tptr);
1549 ND_PRINT((ndo, "%s%s",
1550 ipaddr_string(ndo, tptr),
1551 (tlen>4) ? ", " : ""));
1552 tlen -=4;
1553 tptr +=4;
1554 }
1555 break;
1556 case BGPTYPE_MP_REACH_NLRI:
1557 ND_TCHECK_3(tptr);
1558 af = EXTRACT_BE_U_2(tptr);
1559 safi = EXTRACT_U_1(tptr + 2);
1560
1561 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1562 tok2str(af_values, "Unknown AFI", af),
1563 af,
1564 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1565 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1566 safi));
1567
1568 switch(af<<8 | safi) {
1569 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1570 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1571 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1572 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1573 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1574 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1575 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1576 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1577 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1578 case (AFNUM_INET<<8 | SAFNUM_MDT):
1579 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1580 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1581 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1582 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1583 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1584 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1585 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1586 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1587 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1588 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1589 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1590 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1591 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1592 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1593 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1594 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1595 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1596 break;
1597 default:
1598 ND_TCHECK_LEN(tptr, tlen);
1599 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1600 if (ndo->ndo_vflag <= 1)
1601 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1602 goto done;
1603 break;
1604 }
1605
1606 tptr +=3;
1607
1608 ND_TCHECK_1(tptr);
1609 nhlen = EXTRACT_U_1(tptr);
1610 tlen = nhlen;
1611 tptr++;
1612
1613 if (tlen) {
1614 int nnh = 0;
1615 ND_PRINT((ndo, "\n\t nexthop: "));
1616 while (tlen > 0) {
1617 if ( nnh++ > 0 ) {
1618 ND_PRINT((ndo, ", " ));
1619 }
1620 switch(af<<8 | safi) {
1621 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1622 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1623 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1624 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1625 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1626 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1627 case (AFNUM_INET<<8 | SAFNUM_MDT):
1628 if (tlen < sizeof(struct in_addr)) {
1629 ND_PRINT((ndo, "invalid len"));
1630 tlen = 0;
1631 } else {
1632 ND_TCHECK_LEN(tptr, sizeof(struct in_addr));
1633 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1634 tlen -= sizeof(struct in_addr);
1635 tptr += sizeof(struct in_addr);
1636 }
1637 break;
1638 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1639 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1640 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1641 if (tlen < sizeof(struct in_addr)+BGP_VPN_RD_LEN) {
1642 ND_PRINT((ndo, "invalid len"));
1643 tlen = 0;
1644 } else {
1645 ND_TCHECK_LEN(tptr,
1646 sizeof(struct in_addr) + BGP_VPN_RD_LEN);
1647 ND_PRINT((ndo, "RD: %s, %s",
1648 bgp_vpn_rd_print(ndo, tptr),
1649 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1650 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1651 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1652 }
1653 break;
1654 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1655 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1656 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1657 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1658 if (tlen < sizeof(struct in6_addr)) {
1659 ND_PRINT((ndo, "invalid len"));
1660 tlen = 0;
1661 } else {
1662 ND_TCHECK_LEN(tptr, sizeof(struct in6_addr));
1663 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr)));
1664 tlen -= sizeof(struct in6_addr);
1665 tptr += sizeof(struct in6_addr);
1666 }
1667 break;
1668 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1669 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1670 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1671 if (tlen < sizeof(struct in6_addr)+BGP_VPN_RD_LEN) {
1672 ND_PRINT((ndo, "invalid len"));
1673 tlen = 0;
1674 } else {
1675 ND_TCHECK_LEN(tptr,
1676 sizeof(struct in6_addr) + BGP_VPN_RD_LEN);
1677 ND_PRINT((ndo, "RD: %s, %s",
1678 bgp_vpn_rd_print(ndo, tptr),
1679 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1680 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1681 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1682 }
1683 break;
1684 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1685 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1686 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1687 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1688 if (tlen < sizeof(struct in_addr)) {
1689 ND_PRINT((ndo, "invalid len"));
1690 tlen = 0;
1691 } else {
1692 ND_TCHECK_LEN(tptr, sizeof(struct in_addr));
1693 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1694 tlen -= (sizeof(struct in_addr));
1695 tptr += (sizeof(struct in_addr));
1696 }
1697 break;
1698 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1699 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1700 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1701 ND_TCHECK_LEN(tptr, tlen);
1702 ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen)));
1703 tptr += tlen;
1704 tlen = 0;
1705 break;
1706
1707 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1708 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1709 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1710 if (tlen < BGP_VPN_RD_LEN+1) {
1711 ND_PRINT((ndo, "invalid len"));
1712 tlen = 0;
1713 } else {
1714 ND_TCHECK_LEN(tptr, tlen);
1715 ND_PRINT((ndo, "RD: %s, %s",
1716 bgp_vpn_rd_print(ndo, tptr),
1717 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1718 /* rfc986 mapped IPv4 address ? */
1719 if (EXTRACT_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
1720 ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4)));
1721 /* rfc1888 mapped IPv6 address ? */
1722 else if (EXTRACT_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
1723 ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3)));
1724 tptr += tlen;
1725 tlen = 0;
1726 }
1727 break;
1728 default:
1729 ND_TCHECK_LEN(tptr, tlen);
1730 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1731 if (ndo->ndo_vflag <= 1)
1732 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1733 tptr += tlen;
1734 tlen = 0;
1735 goto done;
1736 break;
1737 }
1738 }
1739 }
1740 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1741 tptr += tlen;
1742
1743 ND_TCHECK_1(tptr);
1744 snpa = EXTRACT_U_1(tptr);
1745 tptr++;
1746
1747 if (snpa) {
1748 ND_PRINT((ndo, "\n\t %u SNPA", snpa));
1749 for (/*nothing*/; snpa > 0; snpa--) {
1750 ND_TCHECK_1(tptr);
1751 ND_PRINT((ndo, "\n\t %d bytes", EXTRACT_U_1(tptr)));
1752 tptr += EXTRACT_U_1(tptr) + 1;
1753 }
1754 } else {
1755 ND_PRINT((ndo, ", no SNPA"));
1756 }
1757
1758 while (tptr < pptr + len) {
1759 switch (af<<8 | safi) {
1760 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1761 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1762 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1763 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1764 if (advance == -1)
1765 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1766 else if (advance == -2)
1767 goto trunc;
1768 else if (advance == -3)
1769 break; /* bytes left, but not enough */
1770 else
1771 ND_PRINT((ndo, "\n\t %s", buf));
1772 break;
1773 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1774 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1775 if (advance == -1)
1776 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1777 else if (advance == -2)
1778 goto trunc;
1779 else if (advance == -3)
1780 break; /* bytes left, but not enough */
1781 else
1782 ND_PRINT((ndo, "\n\t %s", buf));
1783 break;
1784 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1785 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1786 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1787 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1788 if (advance == -1)
1789 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1790 else if (advance == -2)
1791 goto trunc;
1792 else
1793 ND_PRINT((ndo, "\n\t %s", buf));
1794 break;
1795 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1796 advance = decode_rt_routing_info(ndo, tptr, 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
1802 ND_PRINT((ndo, "\n\t %s", buf));
1803 break;
1804 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1805 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1806 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1807 if (advance == -1)
1808 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1809 else if (advance == -2)
1810 goto trunc;
1811 else
1812 ND_PRINT((ndo, "\n\t %s", buf));
1813 break;
1814
1815 case (AFNUM_INET<<8 | SAFNUM_MDT):
1816 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1817 if (advance == -1)
1818 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1819 else if (advance == -2)
1820 goto trunc;
1821 else
1822 ND_PRINT((ndo, "\n\t %s", buf));
1823 break;
1824 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1825 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1826 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1827 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1828 if (advance == -1)
1829 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1830 else if (advance == -2)
1831 goto trunc;
1832 else if (advance == -3)
1833 break; /* bytes left, but not enough */
1834 else
1835 ND_PRINT((ndo, "\n\t %s", buf));
1836 break;
1837 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1838 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1839 if (advance == -1)
1840 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1841 else if (advance == -2)
1842 goto trunc;
1843 else if (advance == -3)
1844 break; /* bytes left, but not enough */
1845 else
1846 ND_PRINT((ndo, "\n\t %s", buf));
1847 break;
1848 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1849 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1850 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1851 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1852 if (advance == -1)
1853 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1854 else if (advance == -2)
1855 goto trunc;
1856 else
1857 ND_PRINT((ndo, "\n\t %s", buf));
1858 break;
1859 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1860 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1861 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1862 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1863 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1864 if (advance == -1)
1865 ND_PRINT((ndo, "\n\t (illegal length)"));
1866 else if (advance == -2)
1867 goto trunc;
1868 else
1869 ND_PRINT((ndo, "\n\t %s", buf));
1870 break;
1871 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1872 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1873 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1874 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1875 if (advance == -1)
1876 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1877 else if (advance == -2)
1878 goto trunc;
1879 else
1880 ND_PRINT((ndo, "\n\t %s", buf));
1881 break;
1882 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1883 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1884 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1885 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1886 if (advance == -1)
1887 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1888 else if (advance == -2)
1889 goto trunc;
1890 else
1891 ND_PRINT((ndo, "\n\t %s", buf));
1892 break;
1893 default:
1894 ND_TCHECK_LEN(tptr, tlen);
1895 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1896 if (ndo->ndo_vflag <= 1)
1897 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1898 advance = 0;
1899 tptr = pptr + len;
1900 break;
1901 }
1902 if (advance < 0)
1903 break;
1904 tptr += advance;
1905 }
1906 done:
1907 break;
1908
1909 case BGPTYPE_MP_UNREACH_NLRI:
1910 ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
1911 af = EXTRACT_BE_U_2(tptr);
1912 safi = EXTRACT_U_1(tptr + 2);
1913
1914 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1915 tok2str(af_values, "Unknown AFI", af),
1916 af,
1917 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1918 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1919 safi));
1920
1921 if (len == BGP_MP_NLRI_MINSIZE)
1922 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
1923
1924 tptr += 3;
1925
1926 while (tptr < pptr + len) {
1927 switch (af<<8 | safi) {
1928 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1929 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1930 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1931 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1932 if (advance == -1)
1933 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1934 else if (advance == -2)
1935 goto trunc;
1936 else if (advance == -3)
1937 break; /* bytes left, but not enough */
1938 else
1939 ND_PRINT((ndo, "\n\t %s", buf));
1940 break;
1941 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1942 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1943 if (advance == -1)
1944 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1945 else if (advance == -2)
1946 goto trunc;
1947 else if (advance == -3)
1948 break; /* bytes left, but not enough */
1949 else
1950 ND_PRINT((ndo, "\n\t %s", buf));
1951 break;
1952 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1953 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1954 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1955 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1956 if (advance == -1)
1957 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1958 else if (advance == -2)
1959 goto trunc;
1960 else
1961 ND_PRINT((ndo, "\n\t %s", buf));
1962 break;
1963 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1964 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1965 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1966 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1967 if (advance == -1)
1968 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1969 else if (advance == -2)
1970 goto trunc;
1971 else if (advance == -3)
1972 break; /* bytes left, but not enough */
1973 else
1974 ND_PRINT((ndo, "\n\t %s", buf));
1975 break;
1976 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1977 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1978 if (advance == -1)
1979 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1980 else if (advance == -2)
1981 goto trunc;
1982 else if (advance == -3)
1983 break; /* bytes left, but not enough */
1984 else
1985 ND_PRINT((ndo, "\n\t %s", buf));
1986 break;
1987 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1988 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1989 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1990 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1991 if (advance == -1)
1992 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1993 else if (advance == -2)
1994 goto trunc;
1995 else
1996 ND_PRINT((ndo, "\n\t %s", buf));
1997 break;
1998 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1999 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2000 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2001 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2002 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
2003 if (advance == -1)
2004 ND_PRINT((ndo, "\n\t (illegal length)"));
2005 else if (advance == -2)
2006 goto trunc;
2007 else
2008 ND_PRINT((ndo, "\n\t %s", buf));
2009 break;
2010 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2011 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2012 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2013 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2014 if (advance == -1)
2015 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2016 else if (advance == -2)
2017 goto trunc;
2018 else
2019 ND_PRINT((ndo, "\n\t %s", buf));
2020 break;
2021 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2022 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2023 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2024 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2025 if (advance == -1)
2026 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2027 else if (advance == -2)
2028 goto trunc;
2029 else
2030 ND_PRINT((ndo, "\n\t %s", buf));
2031 break;
2032 case (AFNUM_INET<<8 | SAFNUM_MDT):
2033 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
2034 if (advance == -1)
2035 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2036 else if (advance == -2)
2037 goto trunc;
2038 else
2039 ND_PRINT((ndo, "\n\t %s", buf));
2040 break;
2041 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
2042 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
2043 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
2044 if (advance == -1)
2045 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2046 else if (advance == -2)
2047 goto trunc;
2048 else
2049 ND_PRINT((ndo, "\n\t %s", buf));
2050 break;
2051 default:
2052 ND_TCHECK_LEN(tptr - 3, tlen);
2053 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
2054 if (ndo->ndo_vflag <= 1)
2055 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
2056 advance = 0;
2057 tptr = pptr + len;
2058 break;
2059 }
2060 if (advance < 0)
2061 break;
2062 tptr += advance;
2063 }
2064 break;
2065 case BGPTYPE_EXTD_COMMUNITIES:
2066 if (len % 8) {
2067 ND_PRINT((ndo, "invalid len"));
2068 break;
2069 }
2070 while (tlen>0) {
2071 uint16_t extd_comm;
2072
2073 ND_TCHECK_2(tptr);
2074 extd_comm=EXTRACT_BE_U_2(tptr);
2075
2076 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]",
2077 tok2str(bgp_extd_comm_subtype_values,
2078 "unknown extd community typecode",
2079 extd_comm),
2080 extd_comm,
2081 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2082
2083 ND_TCHECK_6(tptr + 2);
2084 switch(extd_comm) {
2085 case BGP_EXT_COM_RT_0:
2086 case BGP_EXT_COM_RO_0:
2087 case BGP_EXT_COM_L2VPN_RT_0:
2088 ND_PRINT((ndo, ": %u:%u (= %s)",
2089 EXTRACT_BE_U_2(tptr + 2),
2090 EXTRACT_BE_U_4(tptr + 4),
2091 ipaddr_string(ndo, tptr+4)));
2092 break;
2093 case BGP_EXT_COM_RT_1:
2094 case BGP_EXT_COM_RO_1:
2095 case BGP_EXT_COM_L2VPN_RT_1:
2096 case BGP_EXT_COM_VRF_RT_IMP:
2097 ND_PRINT((ndo, ": %s:%u",
2098 ipaddr_string(ndo, tptr+2),
2099 EXTRACT_BE_U_2(tptr + 6)));
2100 break;
2101 case BGP_EXT_COM_RT_2:
2102 case BGP_EXT_COM_RO_2:
2103 ND_PRINT((ndo, ": %s:%u",
2104 as_printf(ndo, astostr, sizeof(astostr),
2105 EXTRACT_BE_U_4(tptr + 2)), EXTRACT_BE_U_2(tptr + 6)));
2106 break;
2107 case BGP_EXT_COM_LINKBAND:
2108 bw.i = EXTRACT_BE_U_4(tptr + 2);
2109 ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2110 bw.f*8/1000000));
2111 break;
2112 case BGP_EXT_COM_VPN_ORIGIN:
2113 case BGP_EXT_COM_VPN_ORIGIN2:
2114 case BGP_EXT_COM_VPN_ORIGIN3:
2115 case BGP_EXT_COM_VPN_ORIGIN4:
2116 case BGP_EXT_COM_OSPF_RID:
2117 case BGP_EXT_COM_OSPF_RID2:
2118 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2)));
2119 break;
2120 case BGP_EXT_COM_OSPF_RTYPE:
2121 case BGP_EXT_COM_OSPF_RTYPE2:
2122 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2123 ipaddr_string(ndo, tptr+2),
2124 tok2str(bgp_extd_comm_ospf_rtype_values,
2125 "unknown (0x%02x)",
2126 EXTRACT_U_1((tptr + 6))),
2127 (EXTRACT_U_1(tptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2128 ((EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_EXT) || (EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2129 break;
2130 case BGP_EXT_COM_L2INFO:
2131 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2132 tok2str(l2vpn_encaps_values,
2133 "unknown encaps",
2134 EXTRACT_U_1((tptr + 2))),
2135 EXTRACT_U_1((tptr + 3)),
2136 EXTRACT_BE_U_2(tptr + 4)));
2137 break;
2138 case BGP_EXT_COM_SOURCE_AS:
2139 ND_PRINT((ndo, ": AS %u", EXTRACT_BE_U_2(tptr + 2)));
2140 break;
2141 default:
2142 ND_TCHECK_8(tptr);
2143 print_unknown_data(ndo, tptr, "\n\t ", 8);
2144 break;
2145 }
2146 tlen -=8;
2147 tptr +=8;
2148 }
2149 break;
2150
2151 case BGPTYPE_PMSI_TUNNEL:
2152 {
2153 uint8_t tunnel_type, flags;
2154
2155 ND_TCHECK_5(tptr);
2156 flags = EXTRACT_U_1(tptr);
2157 tunnel_type = EXTRACT_U_1(tptr + 1);
2158 tlen = len;
2159
2160 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2161 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2162 tunnel_type,
2163 bittok2str(bgp_pmsi_flag_values, "none", flags),
2164 EXTRACT_BE_U_3(tptr + 2)>>4));
2165
2166 tptr +=5;
2167 tlen -= 5;
2168
2169 switch (tunnel_type) {
2170 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2171 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2172 ND_TCHECK_8(tptr);
2173 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s",
2174 ipaddr_string(ndo, tptr),
2175 ipaddr_string(ndo, tptr+4)));
2176 break;
2177
2178 case BGP_PMSI_TUNNEL_PIM_SSM:
2179 ND_TCHECK_8(tptr);
2180 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s",
2181 ipaddr_string(ndo, tptr),
2182 ipaddr_string(ndo, tptr+4)));
2183 break;
2184 case BGP_PMSI_TUNNEL_INGRESS:
2185 ND_TCHECK_4(tptr);
2186 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s",
2187 ipaddr_string(ndo, tptr)));
2188 break;
2189 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2190 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2191 ND_TCHECK_8(tptr);
2192 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x",
2193 ipaddr_string(ndo, tptr),
2194 EXTRACT_BE_U_4(tptr + 4)));
2195 break;
2196 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2197 ND_TCHECK_8(tptr);
2198 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2199 ipaddr_string(ndo, tptr),
2200 EXTRACT_BE_U_4(tptr + 4)));
2201 break;
2202 default:
2203 if (ndo->ndo_vflag <= 1) {
2204 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2205 }
2206 }
2207 break;
2208 }
2209 case BGPTYPE_AIGP:
2210 {
2211 uint8_t type;
2212 uint16_t length;
2213
2214 tlen = len;
2215
2216 while (tlen >= 3) {
2217
2218 ND_TCHECK_3(tptr);
2219
2220 type = EXTRACT_U_1(tptr);
2221 length = EXTRACT_BE_U_2(tptr + 1);
2222 tptr += 3;
2223 tlen -= 3;
2224
2225 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u",
2226 tok2str(bgp_aigp_values, "Unknown", type),
2227 type, length));
2228
2229 if (length < 3)
2230 goto trunc;
2231 length -= 3;
2232
2233 /*
2234 * Check if we can read the TLV data.
2235 */
2236 ND_TCHECK_LEN(tptr + 3, length);
2237
2238 switch (type) {
2239
2240 case BGP_AIGP_TLV:
2241 if (length < 8)
2242 goto trunc;
2243 ND_PRINT((ndo, ", metric %" PRIu64,
2244 EXTRACT_BE_U_8(tptr)));
2245 break;
2246
2247 default:
2248 if (ndo->ndo_vflag <= 1) {
2249 print_unknown_data(ndo, tptr,"\n\t ", length);
2250 }
2251 }
2252
2253 tptr += length;
2254 tlen -= length;
2255 }
2256 break;
2257 }
2258 case BGPTYPE_ATTR_SET:
2259 ND_TCHECK_4(tptr);
2260 if (len < 4)
2261 goto trunc;
2262 ND_PRINT((ndo, "\n\t Origin AS: %s",
2263 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr))));
2264 tptr+=4;
2265 len -=4;
2266
2267 while (len) {
2268 u_int aflags, alenlen, alen;
2269
2270 ND_TCHECK_2(tptr);
2271 if (len < 2)
2272 goto trunc;
2273 aflags = EXTRACT_U_1(tptr);
2274 atype = EXTRACT_U_1(tptr + 1);
2275 tptr += 2;
2276 len -= 2;
2277 alenlen = bgp_attr_lenlen(aflags, tptr);
2278 ND_TCHECK_LEN(tptr, alenlen);
2279 if (len < alenlen)
2280 goto trunc;
2281 alen = bgp_attr_len(aflags, tptr);
2282 tptr += alenlen;
2283 len -= alenlen;
2284
2285 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2286 tok2str(bgp_attr_values,
2287 "Unknown Attribute", atype),
2288 atype,
2289 alen));
2290
2291 if (aflags) {
2292 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2293 aflags & 0x80 ? "O" : "",
2294 aflags & 0x40 ? "T" : "",
2295 aflags & 0x20 ? "P" : "",
2296 aflags & 0x10 ? "E" : ""));
2297 if (aflags & 0xf)
2298 ND_PRINT((ndo, "+%x", aflags & 0xf));
2299 ND_PRINT((ndo, "]: "));
2300 }
2301 /* FIXME check for recursion */
2302 if (!bgp_attr_print(ndo, atype, tptr, alen))
2303 return 0;
2304 tptr += alen;
2305 len -= alen;
2306 }
2307 break;
2308
2309 case BGPTYPE_LARGE_COMMUNITY:
2310 if (len == 0 || len % 12) {
2311 ND_PRINT((ndo, "invalid len"));
2312 break;
2313 }
2314 ND_PRINT((ndo, "\n\t "));
2315 while (len > 0) {
2316 ND_TCHECK_LEN(tptr, 12);
2317 ND_PRINT((ndo, "%u:%u:%u%s",
2318 EXTRACT_BE_U_4(tptr),
2319 EXTRACT_BE_U_4(tptr + 4),
2320 EXTRACT_BE_U_4(tptr + 8),
2321 (len > 12) ? ", " : ""));
2322 tptr += 12;
2323 len -= 12;
2324 }
2325 break;
2326 default:
2327 ND_TCHECK_LEN(pptr, len);
2328 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2329 if (ndo->ndo_vflag <= 1)
2330 print_unknown_data(ndo, pptr, "\n\t ", len);
2331 break;
2332 }
2333 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2334 ND_TCHECK_LEN(pptr, len);
2335 print_unknown_data(ndo, pptr, "\n\t ", len);
2336 }
2337 return 1;
2338
2339 trunc:
2340 return 0;
2341 }
2342
2343 static void
2344 bgp_capabilities_print(netdissect_options *ndo,
2345 const u_char *opt, int caps_len)
2346 {
2347 int cap_type, cap_len, tcap_len, cap_offset;
2348 int i = 0;
2349
2350 while (i < caps_len) {
2351 ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
2352 cap_type=EXTRACT_U_1(opt + i);
2353 cap_len=EXTRACT_U_1(opt + i + 1);
2354 tcap_len=cap_len;
2355 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2356 tok2str(bgp_capcode_values, "Unknown",
2357 cap_type),
2358 cap_type,
2359 cap_len));
2360 ND_TCHECK_LEN(opt + 2 + i, cap_len);
2361 switch (cap_type) {
2362 case BGP_CAPCODE_MP:
2363 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2364 tok2str(af_values, "Unknown",
2365 EXTRACT_BE_U_2(opt + i + 2)),
2366 EXTRACT_BE_U_2(opt + i + 2),
2367 tok2str(bgp_safi_values, "Unknown",
2368 EXTRACT_U_1(opt + i + 5)),
2369 EXTRACT_U_1(opt + i + 5)));
2370 break;
2371 case BGP_CAPCODE_RESTART:
2372 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2373 ((EXTRACT_U_1(opt + i + 2))&0x80) ? "R" : "none",
2374 EXTRACT_BE_U_2(opt + i + 2)&0xfff));
2375 tcap_len-=2;
2376 cap_offset=4;
2377 while(tcap_len>=4) {
2378 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2379 tok2str(af_values,"Unknown",
2380 EXTRACT_BE_U_2(opt + i + cap_offset)),
2381 EXTRACT_BE_U_2(opt + i + cap_offset),
2382 tok2str(bgp_safi_values,"Unknown",
2383 EXTRACT_U_1(opt + i + cap_offset + 2)),
2384 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2385 ((EXTRACT_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" ));
2386 tcap_len-=4;
2387 cap_offset+=4;
2388 }
2389 break;
2390 case BGP_CAPCODE_RR:
2391 case BGP_CAPCODE_RR_CISCO:
2392 break;
2393 case BGP_CAPCODE_AS_NEW:
2394
2395 /*
2396 * Extract the 4 byte AS number encoded.
2397 */
2398 if (cap_len == 4) {
2399 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2400 as_printf(ndo, astostr, sizeof(astostr),
2401 EXTRACT_BE_U_4(opt + i + 2))));
2402 }
2403 break;
2404 case BGP_CAPCODE_ADD_PATH:
2405 cap_offset=2;
2406 if (tcap_len == 0) {
2407 ND_PRINT((ndo, " (bogus)")); /* length */
2408 break;
2409 }
2410 while (tcap_len > 0) {
2411 if (tcap_len < 4) {
2412 ND_PRINT((ndo, "\n\t\t(invalid)"));
2413 break;
2414 }
2415 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2416 tok2str(af_values,"Unknown",EXTRACT_BE_U_2(opt + i + cap_offset)),
2417 EXTRACT_BE_U_2(opt + i + cap_offset),
2418 tok2str(bgp_safi_values,"Unknown",EXTRACT_U_1(opt + i + cap_offset + 2)),
2419 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2420 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",EXTRACT_U_1(opt + i + cap_offset + 3))
2421 ));
2422 tcap_len-=4;
2423 cap_offset+=4;
2424 }
2425 break;
2426 default:
2427 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2428 cap_type));
2429 if (ndo->ndo_vflag <= 1)
2430 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2431 cap_len);
2432 break;
2433 }
2434 if (ndo->ndo_vflag > 1 && cap_len > 0) {
2435 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2436 }
2437 i += BGP_CAP_HEADER_SIZE + cap_len;
2438 }
2439 return;
2440
2441 trunc:
2442 ND_PRINT((ndo, "[|BGP]"));
2443 }
2444
2445 static void
2446 bgp_open_print(netdissect_options *ndo,
2447 const u_char *dat, int length)
2448 {
2449 struct bgp_open bgpo;
2450 struct bgp_opt bgpopt;
2451 const u_char *opt;
2452 int i;
2453
2454 ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
2455 memcpy(&bgpo, dat, BGP_OPEN_SIZE);
2456
2457 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version));
2458 ND_PRINT((ndo, "my AS %s, ",
2459 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas))));
2460 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime)));
2461 ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgpo.bgpo_id)));
2462 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen));
2463
2464 /* some little sanity checking */
2465 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE)
2466 return;
2467
2468 /* ugly! */
2469 opt = &((const struct bgp_open *)dat)->bgpo_optlen;
2470 opt++;
2471
2472 i = 0;
2473 while (i < bgpo.bgpo_optlen) {
2474 ND_TCHECK_LEN(opt + i, BGP_OPT_SIZE);
2475 memcpy(&bgpopt, opt + i, BGP_OPT_SIZE);
2476 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
2477 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len));
2478 break;
2479 }
2480
2481 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u",
2482 tok2str(bgp_opt_values,"Unknown",
2483 bgpopt.bgpopt_type),
2484 bgpopt.bgpopt_type,
2485 bgpopt.bgpopt_len));
2486
2487 /* now let's decode the options we know*/
2488 switch(bgpopt.bgpopt_type) {
2489
2490 case BGP_OPT_CAP:
2491 bgp_capabilities_print(ndo, opt + i + BGP_OPT_SIZE,
2492 bgpopt.bgpopt_len);
2493 break;
2494
2495 case BGP_OPT_AUTH:
2496 default:
2497 ND_PRINT((ndo, "\n\t no decoder for option %u",
2498 bgpopt.bgpopt_type));
2499 break;
2500 }
2501 i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
2502 }
2503 return;
2504 trunc:
2505 ND_PRINT((ndo, "[|BGP]"));
2506 }
2507
2508 static void
2509 bgp_update_print(netdissect_options *ndo,
2510 const u_char *dat, int length)
2511 {
2512 struct bgp bgp;
2513 const u_char *p;
2514 int withdrawn_routes_len;
2515 int len;
2516 int i;
2517
2518 ND_TCHECK_LEN(dat, BGP_SIZE);
2519 if (length < BGP_SIZE)
2520 goto trunc;
2521 memcpy(&bgp, dat, BGP_SIZE);
2522 p = dat + BGP_SIZE; /*XXX*/
2523 length -= BGP_SIZE;
2524
2525 /* Unfeasible routes */
2526 ND_TCHECK_2(p);
2527 if (length < 2)
2528 goto trunc;
2529 withdrawn_routes_len = EXTRACT_BE_U_2(p);
2530 p += 2;
2531 length -= 2;
2532 if (withdrawn_routes_len) {
2533 /*
2534 * Without keeping state from the original NLRI message,
2535 * it's not possible to tell if this a v4 or v6 route,
2536 * so only try to decode it if we're not v6 enabled.
2537 */
2538 ND_TCHECK_LEN(p, withdrawn_routes_len);
2539 if (length < withdrawn_routes_len)
2540 goto trunc;
2541 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len));
2542 p += withdrawn_routes_len;
2543 length -= withdrawn_routes_len;
2544 }
2545
2546 ND_TCHECK_2(p);
2547 if (length < 2)
2548 goto trunc;
2549 len = EXTRACT_BE_U_2(p);
2550 p += 2;
2551 length -= 2;
2552
2553 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2554 /* No withdrawn routes, no path attributes, no NLRI */
2555 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2556 return;
2557 }
2558
2559 if (len) {
2560 /* do something more useful!*/
2561 while (len) {
2562 int aflags, atype, alenlen, alen;
2563
2564 ND_TCHECK_2(p);
2565 if (len < 2)
2566 goto trunc;
2567 if (length < 2)
2568 goto trunc;
2569 aflags = EXTRACT_U_1(p);
2570 atype = EXTRACT_U_1(p + 1);
2571 p += 2;
2572 len -= 2;
2573 length -= 2;
2574 alenlen = bgp_attr_lenlen(aflags, p);
2575 ND_TCHECK_LEN(p, alenlen);
2576 if (len < alenlen)
2577 goto trunc;
2578 if (length < alenlen)
2579 goto trunc;
2580 alen = bgp_attr_len(aflags, p);
2581 p += alenlen;
2582 len -= alenlen;
2583 length -= alenlen;
2584
2585 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2586 tok2str(bgp_attr_values, "Unknown Attribute",
2587 atype),
2588 atype,
2589 alen));
2590
2591 if (aflags) {
2592 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2593 aflags & 0x80 ? "O" : "",
2594 aflags & 0x40 ? "T" : "",
2595 aflags & 0x20 ? "P" : "",
2596 aflags & 0x10 ? "E" : ""));
2597 if (aflags & 0xf)
2598 ND_PRINT((ndo, "+%x", aflags & 0xf));
2599 ND_PRINT((ndo, "]: "));
2600 }
2601 if (len < alen)
2602 goto trunc;
2603 if (length < alen)
2604 goto trunc;
2605 if (!bgp_attr_print(ndo, atype, p, alen))
2606 goto trunc;
2607 p += alen;
2608 len -= alen;
2609 length -= alen;
2610 }
2611 }
2612
2613 if (length) {
2614 /*
2615 * XXX - what if they're using the "Advertisement of
2616 * Multiple Paths in BGP" feature:
2617 *
2618 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/
2619 *
2620 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06
2621 */
2622 ND_PRINT((ndo, "\n\t Updated routes:"));
2623 while (length) {
2624 char buf[MAXHOSTNAMELEN + 100];
2625 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2626 if (i == -1) {
2627 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2628 break;
2629 } else if (i == -2)
2630 goto trunc;
2631 else if (i == -3)
2632 goto trunc; /* bytes left, but not enough */
2633 else {
2634 ND_PRINT((ndo, "\n\t %s", buf));
2635 p += i;
2636 length -= i;
2637 }
2638 }
2639 }
2640 return;
2641 trunc:
2642 ND_PRINT((ndo, "[|BGP]"));
2643 }
2644
2645 static void
2646 bgp_notification_print(netdissect_options *ndo,
2647 const u_char *dat, int length)
2648 {
2649 struct bgp_notification bgpn;
2650 const u_char *tptr;
2651 uint8_t shutdown_comm_length;
2652 uint8_t remainder_offset;
2653
2654 ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
2655 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
2656
2657 /* some little sanity checking */
2658 if (length<BGP_NOTIFICATION_SIZE)
2659 return;
2660
2661 ND_PRINT((ndo, ", %s (%u)",
2662 tok2str(bgp_notify_major_values, "Unknown Error",
2663 bgpn.bgpn_major),
2664 bgpn.bgpn_major));
2665
2666 switch (bgpn.bgpn_major) {
2667
2668 case BGP_NOTIFY_MAJOR_MSG:
2669 ND_PRINT((ndo, ", subcode %s (%u)",
2670 tok2str(bgp_notify_minor_msg_values, "Unknown",
2671 bgpn.bgpn_minor),
2672 bgpn.bgpn_minor));
2673 break;
2674 case BGP_NOTIFY_MAJOR_OPEN:
2675 ND_PRINT((ndo, ", subcode %s (%u)",
2676 tok2str(bgp_notify_minor_open_values, "Unknown",
2677 bgpn.bgpn_minor),
2678 bgpn.bgpn_minor));
2679 break;
2680 case BGP_NOTIFY_MAJOR_UPDATE:
2681 ND_PRINT((ndo, ", subcode %s (%u)",
2682 tok2str(bgp_notify_minor_update_values, "Unknown",
2683 bgpn.bgpn_minor),
2684 bgpn.bgpn_minor));
2685 break;
2686 case BGP_NOTIFY_MAJOR_FSM:
2687 ND_PRINT((ndo, " subcode %s (%u)",
2688 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2689 bgpn.bgpn_minor),
2690 bgpn.bgpn_minor));
2691 break;
2692 case BGP_NOTIFY_MAJOR_CAP:
2693 ND_PRINT((ndo, " subcode %s (%u)",
2694 tok2str(bgp_notify_minor_cap_values, "Unknown",
2695 bgpn.bgpn_minor),
2696 bgpn.bgpn_minor));
2697 break;
2698 case BGP_NOTIFY_MAJOR_CEASE:
2699 ND_PRINT((ndo, ", subcode %s (%u)",
2700 tok2str(bgp_notify_minor_cease_values, "Unknown",
2701 bgpn.bgpn_minor),
2702 bgpn.bgpn_minor));
2703
2704 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2705 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2706 */
2707 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2708 tptr = dat + BGP_NOTIFICATION_SIZE;
2709 ND_TCHECK_7(tptr);
2710 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2711 tok2str(af_values, "Unknown",
2712 EXTRACT_BE_U_2(tptr)),
2713 EXTRACT_BE_U_2(tptr),
2714 tok2str(bgp_safi_values, "Unknown", EXTRACT_U_1((tptr + 2))),
2715 EXTRACT_U_1((tptr + 2)),
2716 EXTRACT_BE_U_4(tptr + 3)));
2717 }
2718 /*
2719 * draft-ietf-idr-shutdown describes a method to send a communication
2720 * intended for human consumption regarding the Administrative Shutdown
2721 */
2722 if ((bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
2723 bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
2724 length >= BGP_NOTIFICATION_SIZE + 1) {
2725 tptr = dat + BGP_NOTIFICATION_SIZE;
2726 ND_TCHECK_1(tptr);
2727 shutdown_comm_length = EXTRACT_U_1(tptr);
2728 remainder_offset = 0;
2729 /* garbage, hexdump it all */
2730 if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN ||
2731 shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) {
2732 ND_PRINT((ndo, ", invalid Shutdown Communication length"));
2733 }
2734 else if (shutdown_comm_length == 0) {
2735 ND_PRINT((ndo, ", empty Shutdown Communication"));
2736 remainder_offset += 1;
2737 }
2738 /* a proper shutdown communication */
2739 else {
2740 ND_TCHECK_LEN(tptr + 1, shutdown_comm_length);
2741 ND_PRINT((ndo, ", Shutdown Communication (length: %u): \"", shutdown_comm_length));
2742 (void)fn_printn(ndo, tptr+1, shutdown_comm_length, NULL);
2743 ND_PRINT((ndo, "\""));
2744 remainder_offset += shutdown_comm_length + 1;
2745 }
2746 /* if there is trailing data, hexdump it */
2747 if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) {
2748 ND_PRINT((ndo, ", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE)));
2749 hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2750 }
2751 }
2752 break;
2753 default:
2754 break;
2755 }
2756
2757 return;
2758 trunc:
2759 ND_PRINT((ndo, "[|BGP]"));
2760 }
2761
2762 static void
2763 bgp_route_refresh_print(netdissect_options *ndo,
2764 const u_char *pptr, int len)
2765 {
2766 const struct bgp_route_refresh *bgp_route_refresh_header;
2767
2768 ND_TCHECK_LEN(pptr, BGP_ROUTE_REFRESH_SIZE);
2769
2770 /* some little sanity checking */
2771 if (len<BGP_ROUTE_REFRESH_SIZE)
2772 return;
2773
2774 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2775
2776 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)",
2777 tok2str(af_values,"Unknown",
2778 /* this stinks but the compiler pads the structure
2779 * weird */
2780 EXTRACT_BE_U_2(&bgp_route_refresh_header->afi)),
2781 EXTRACT_BE_U_2(&bgp_route_refresh_header->afi),
2782 tok2str(bgp_safi_values,"Unknown",
2783 bgp_route_refresh_header->safi),
2784 bgp_route_refresh_header->safi));
2785
2786 if (ndo->ndo_vflag > 1) {
2787 ND_TCHECK_LEN(pptr, len);
2788 print_unknown_data(ndo, pptr, "\n\t ", len);
2789 }
2790
2791 return;
2792 trunc:
2793 ND_PRINT((ndo, "[|BGP]"));
2794 }
2795
2796 static int
2797 bgp_header_print(netdissect_options *ndo,
2798 const u_char *dat, int length)
2799 {
2800 struct bgp bgp;
2801
2802 ND_TCHECK_LEN(dat, BGP_SIZE);
2803 memcpy(&bgp, dat, BGP_SIZE);
2804 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2805 tok2str(bgp_msg_values, "Unknown", bgp.bgp_type),
2806 bgp.bgp_type,
2807 length));
2808
2809 switch (bgp.bgp_type) {
2810 case BGP_OPEN:
2811 bgp_open_print(ndo, dat, length);
2812 break;
2813 case BGP_UPDATE:
2814 bgp_update_print(ndo, dat, length);
2815 break;
2816 case BGP_NOTIFICATION:
2817 bgp_notification_print(ndo, dat, length);
2818 break;
2819 case BGP_KEEPALIVE:
2820 break;
2821 case BGP_ROUTE_REFRESH:
2822 bgp_route_refresh_print(ndo, dat, length);
2823 break;
2824 default:
2825 /* we have no decoder for the BGP message */
2826 ND_TCHECK_LEN(dat, length);
2827 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type));
2828 print_unknown_data(ndo, dat, "\n\t ", length);
2829 break;
2830 }
2831 return 1;
2832 trunc:
2833 ND_PRINT((ndo, "[|BGP]"));
2834 return 0;
2835 }
2836
2837 void
2838 bgp_print(netdissect_options *ndo,
2839 const u_char *dat, int length)
2840 {
2841 const u_char *p;
2842 const u_char *ep;
2843 const u_char *start;
2844 const u_char marker[] = {
2845 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2846 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2847 };
2848 struct bgp bgp;
2849 uint16_t hlen;
2850
2851 ep = dat + length;
2852 if (ndo->ndo_snapend < dat + length)
2853 ep = ndo->ndo_snapend;
2854
2855 ND_PRINT((ndo, ": BGP"));
2856
2857 if (ndo->ndo_vflag < 1) /* lets be less chatty */
2858 return;
2859
2860 p = dat;
2861 start = p;
2862 while (p < ep) {
2863 if (!ND_TTEST_1(p))
2864 break;
2865 if (EXTRACT_U_1(p) != 0xff) {
2866 p++;
2867 continue;
2868 }
2869
2870 if (!ND_TTEST_LEN(p, sizeof(marker)))
2871 break;
2872 if (memcmp(p, marker, sizeof(marker)) != 0) {
2873 p++;
2874 continue;
2875 }
2876
2877 /* found BGP header */
2878 ND_TCHECK_LEN(p, BGP_SIZE); /*XXX*/
2879 memcpy(&bgp, p, BGP_SIZE);
2880
2881 if (start != p)
2882 ND_PRINT((ndo, " [|BGP]"));
2883
2884 hlen = ntohs(bgp.bgp_len);
2885 if (hlen < BGP_SIZE) {
2886 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
2887 BGP_SIZE));
2888 break;
2889 }
2890
2891 if (ND_TTEST_LEN(p, hlen)) {
2892 if (!bgp_header_print(ndo, p, hlen))
2893 return;
2894 p += hlen;
2895 start = p;
2896 } else {
2897 ND_PRINT((ndo, "\n[|BGP %s]",
2898 tok2str(bgp_msg_values,
2899 "Unknown Message Type",
2900 bgp.bgp_type)));
2901 break;
2902 }
2903 }
2904
2905 return;
2906
2907 trunc:
2908 ND_PRINT((ndo, " [|BGP]"));
2909 }
2910
2911 /*
2912 * Local Variables:
2913 * c-style: whitesmith
2914 * c-basic-offset: 4
2915 * End:
2916 */
[mirror] the TCPdump network dissector