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Use more the EXTRACT_U_1() macro (56/n)
[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 nd_byte bgp_marker[16];
52 nd_uint16_t bgp_len;
53 nd_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 nd_byte bgpo_marker[16];
74 nd_uint16_t bgpo_len;
75 nd_uint8_t bgpo_type;
76 nd_uint8_t bgpo_version;
77 nd_uint16_t bgpo_myas;
78 nd_uint16_t bgpo_holdtime;
79 nd_uint32_t bgpo_id;
80 nd_uint8_t bgpo_optlen;
81 /* options should follow */
82 };
83 #define BGP_OPEN_SIZE 29 /* unaligned */
84
85 struct bgp_opt {
86 nd_uint8_t bgpopt_type;
87 nd_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 nd_byte bgpn_marker[16];
95 nd_uint16_t bgpn_len;
96 nd_uint8_t bgpn_type;
97 nd_uint8_t bgpn_major;
98 nd_uint8_t bgpn_minor;
99 };
100 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
101
102 struct bgp_route_refresh {
103 nd_byte bgp_marker[16];
104 nd_uint16_t len;
105 nd_uint8_t type; /* No padding after this; afi is, in fact, not aligned */
106 nd_uint16_t afi;
107 nd_uint8_t res;
108 nd_uint8_t safi;
109 };
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) : EXTRACT_U_1(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] &= ((0xff00 >> (plen % 8)) & 0xff);
555 }
556 snprintf(buf, buflen, "%s/%d", ipaddr_string(ndo, &addr), plen);
557 return 1 + plenbytes;
558
559 trunc:
560 return -2;
561
562 badtlv:
563 return -3;
564 }
565
566 static int
567 decode_labeled_prefix4(netdissect_options *ndo,
568 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
569 {
570 struct in_addr addr;
571 u_int plen, plenbytes;
572
573 /* prefix length and label = 4 bytes */
574 ND_TCHECK_4(pptr);
575 ITEMCHECK(4);
576 plen = EXTRACT_U_1(pptr); /* get prefix length */
577
578 /* this is one of the weirdnesses of rfc3107
579 the label length (actually the label + COS bits)
580 is added to the prefix length;
581 we also do only read out just one label -
582 there is no real application for advertisement of
583 stacked labels in a single BGP message
584 */
585
586 if (24 > plen)
587 return -1;
588
589 plen-=24; /* adjust prefixlen - labellength */
590
591 if (32 < plen)
592 return -1;
593 itemlen -= 4;
594
595 memset(&addr, 0, sizeof(addr));
596 plenbytes = (plen + 7) / 8;
597 ND_TCHECK_LEN(pptr + 4, plenbytes);
598 ITEMCHECK(plenbytes);
599 memcpy(&addr, pptr + 4, plenbytes);
600 if (plen % 8) {
601 ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
602 }
603 /* the label may get offsetted by 4 bits so lets shift it right */
604 snprintf(buf, buflen, "%s/%d, label:%u %s",
605 ipaddr_string(ndo, &addr),
606 plen,
607 EXTRACT_BE_U_3(pptr + 1)>>4,
608 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
609
610 return 4 + plenbytes;
611
612 trunc:
613 return -2;
614
615 badtlv:
616 return -3;
617 }
618
619 /*
620 * bgp_vpn_ip_print
621 *
622 * print an ipv4 or ipv6 address into a buffer dependend on address length.
623 */
624 static char *
625 bgp_vpn_ip_print(netdissect_options *ndo,
626 const u_char *pptr, u_int addr_length)
627 {
628
629 /* worst case string is s fully formatted v6 address */
630 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
631 char *pos = addr;
632
633 switch(addr_length) {
634 case (sizeof(struct in_addr) << 3): /* 32 */
635 ND_TCHECK_LEN(pptr, sizeof(struct in_addr));
636 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
637 break;
638 case (sizeof(struct in6_addr) << 3): /* 128 */
639 ND_TCHECK_LEN(pptr, sizeof(struct in6_addr));
640 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
641 break;
642 default:
643 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
644 break;
645 }
646 pos += strlen(pos);
647
648 trunc:
649 *(pos) = '\0';
650 return (addr);
651 }
652
653 /*
654 * bgp_vpn_sg_print
655 *
656 * print an multicast s,g entry into a buffer.
657 * the s,g entry is encoded like this.
658 *
659 * +-----------------------------------+
660 * | Multicast Source Length (1 octet) |
661 * +-----------------------------------+
662 * | Multicast Source (Variable) |
663 * +-----------------------------------+
664 * | Multicast Group Length (1 octet) |
665 * +-----------------------------------+
666 * | Multicast Group (Variable) |
667 * +-----------------------------------+
668 *
669 * return the number of bytes read from the wire.
670 */
671 static int
672 bgp_vpn_sg_print(netdissect_options *ndo,
673 const u_char *pptr, char *buf, u_int buflen)
674 {
675 uint8_t addr_length;
676 u_int total_length, offset;
677
678 total_length = 0;
679
680 /* Source address length, encoded in bits */
681 ND_TCHECK_1(pptr);
682 addr_length = EXTRACT_U_1(pptr);
683 pptr++;
684
685 /* Source address */
686 ND_TCHECK_LEN(pptr, (addr_length >> 3));
687 total_length += (addr_length >> 3) + 1;
688 offset = strlen(buf);
689 if (addr_length) {
690 snprintf(buf + offset, buflen - offset, ", Source %s",
691 bgp_vpn_ip_print(ndo, pptr, addr_length));
692 pptr += (addr_length >> 3);
693 }
694
695 /* Group address length, encoded in bits */
696 ND_TCHECK_1(pptr);
697 addr_length = EXTRACT_U_1(pptr);
698 pptr++;
699
700 /* Group address */
701 ND_TCHECK_LEN(pptr, (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_BE_U_2(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_BE_U_2(pptr + 2),
732 EXTRACT_BE_U_4(pptr + 4),
733 EXTRACT_U_1(pptr + 4), EXTRACT_U_1(pptr + 5),
734 EXTRACT_U_1(pptr + 6), EXTRACT_U_1(pptr + 7));
735 break;
736 /* IP-address:AS fmt*/
737
738 case 1:
739 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
740 EXTRACT_U_1(pptr + 2), EXTRACT_U_1(pptr + 3),
741 EXTRACT_U_1(pptr + 4), EXTRACT_U_1(pptr + 5),
742 EXTRACT_BE_U_2(pptr + 6));
743 break;
744
745 /* 4-byte-AS:number fmt*/
746 case 2:
747 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
748 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(pptr + 2)),
749 EXTRACT_BE_U_2(pptr + 6), EXTRACT_U_1(pptr + 2),
750 EXTRACT_U_1(pptr + 3), EXTRACT_U_1(pptr + 4),
751 EXTRACT_U_1(pptr + 5), EXTRACT_BE_U_2(pptr + 6));
752 break;
753 default:
754 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
755 break;
756 }
757 pos += strlen(pos);
758 *(pos) = '\0';
759 return (rd);
760 }
761
762 static int
763 decode_rt_routing_info(netdissect_options *ndo,
764 const u_char *pptr, char *buf, u_int buflen)
765 {
766 uint8_t route_target[8];
767 u_int plen;
768 char asbuf[sizeof(astostr)]; /* bgp_vpn_rd_print() overwrites astostr */
769
770 /* NLRI "prefix length" from RFC 2858 Section 4. */
771 ND_TCHECK_1(pptr);
772 plen = EXTRACT_U_1(pptr); /* get prefix length */
773
774 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
775 * RFC 4684 Section 4 defines the layout of "origin AS" and "route
776 * target" fields inside the "prefix" depending on its length.
777 */
778 if (0 == plen) {
779 /* Without "origin AS", without "route target". */
780 snprintf(buf, buflen, "default route target");
781 return 1;
782 }
783
784 if (32 > plen)
785 return -1;
786
787 /* With at least "origin AS", possibly with "route target". */
788 ND_TCHECK_4(pptr + 1);
789 as_printf(ndo, asbuf, sizeof(asbuf), EXTRACT_BE_U_4(pptr + 1));
790
791 plen -= 32; /* adjust prefix length */
792
793 if (64 < plen)
794 return -1;
795
796 /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 }
797 * and gives the number of octets in the variable-length "route
798 * target" field inside this NLRI "prefix". Look for it.
799 */
800 memset(&route_target, 0, sizeof(route_target));
801 ND_TCHECK_LEN(pptr + 5, (plen + 7) / 8);
802 memcpy(&route_target, pptr + 5, (plen + 7) / 8);
803 /* Which specification says to do this? */
804 if (plen % 8) {
805 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
806 ((0xff00 >> (plen % 8)) & 0xff);
807 }
808 snprintf(buf, buflen, "origin AS: %s, route target %s",
809 asbuf,
810 bgp_vpn_rd_print(ndo, (u_char *)&route_target));
811
812 return 5 + (plen + 7) / 8;
813
814 trunc:
815 return -2;
816 }
817
818 static int
819 decode_labeled_vpn_prefix4(netdissect_options *ndo,
820 const u_char *pptr, char *buf, u_int buflen)
821 {
822 struct in_addr addr;
823 u_int plen;
824
825 ND_TCHECK_1(pptr);
826 plen = EXTRACT_U_1(pptr); /* get prefix length */
827
828 if ((24+64) > plen)
829 return -1;
830
831 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
832
833 if (32 < plen)
834 return -1;
835
836 memset(&addr, 0, sizeof(addr));
837 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
838 memcpy(&addr, pptr + 12, (plen + 7) / 8);
839 if (plen % 8) {
840 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
841 ((0xff00 >> (plen % 8)) & 0xff);
842 }
843 /* the label may get offsetted by 4 bits so lets shift it right */
844 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
845 bgp_vpn_rd_print(ndo, pptr+4),
846 ipaddr_string(ndo, &addr),
847 plen,
848 EXTRACT_BE_U_3(pptr + 1)>>4,
849 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
850
851 return 12 + (plen + 7) / 8;
852
853 trunc:
854 return -2;
855 }
856
857 /*
858 * +-------------------------------+
859 * | |
860 * | RD:IPv4-address (12 octets) |
861 * | |
862 * +-------------------------------+
863 * | MDT Group-address (4 octets) |
864 * +-------------------------------+
865 */
866
867 #define MDT_VPN_NLRI_LEN 16
868
869 static int
870 decode_mdt_vpn_nlri(netdissect_options *ndo,
871 const u_char *pptr, char *buf, u_int buflen)
872 {
873 const u_char *rd;
874 const u_char *vpn_ip;
875
876 ND_TCHECK_1(pptr);
877
878 /* if the NLRI is not predefined length, quit.*/
879 if (EXTRACT_U_1(pptr) != MDT_VPN_NLRI_LEN * 8)
880 return -1;
881 pptr++;
882
883 /* RD */
884 ND_TCHECK_8(pptr);
885 rd = pptr;
886 pptr += 8;
887
888 /* IPv4 address */
889 ND_TCHECK_LEN(pptr, sizeof(struct in_addr));
890 vpn_ip = pptr;
891 pptr += sizeof(struct in_addr);
892
893 /* MDT Group Address */
894 ND_TCHECK_LEN(pptr, sizeof(struct in_addr));
895
896 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
897 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
898
899 return MDT_VPN_NLRI_LEN + 1;
900
901 trunc:
902 return -2;
903 }
904
905 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
906 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
907 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
908 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
909 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
910 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
911 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
912
913 static const struct tok bgp_multicast_vpn_route_type_values[] = {
914 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
915 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
916 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
917 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
918 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
919 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
920 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
921 { 0, NULL}
922 };
923
924 static int
925 decode_multicast_vpn(netdissect_options *ndo,
926 const u_char *pptr, char *buf, u_int buflen)
927 {
928 uint8_t route_type, route_length, addr_length, sg_length;
929 u_int offset;
930
931 ND_TCHECK_2(pptr);
932 route_type = EXTRACT_U_1(pptr);
933 pptr++;
934 route_length = EXTRACT_U_1(pptr);
935 pptr++;
936
937 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
938 tok2str(bgp_multicast_vpn_route_type_values,
939 "Unknown", route_type),
940 route_type, route_length);
941
942 switch(route_type) {
943 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
944 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
945 offset = strlen(buf);
946 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
947 bgp_vpn_rd_print(ndo, pptr),
948 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
949 (route_length - BGP_VPN_RD_LEN) << 3));
950 break;
951 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
952 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
953 offset = strlen(buf);
954 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
955 bgp_vpn_rd_print(ndo, pptr),
956 as_printf(ndo, astostr, sizeof(astostr),
957 EXTRACT_BE_U_4(pptr + BGP_VPN_RD_LEN)));
958 break;
959
960 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
961 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
962 offset = strlen(buf);
963 snprintf(buf + offset, buflen - offset, ", RD: %s",
964 bgp_vpn_rd_print(ndo, pptr));
965 pptr += BGP_VPN_RD_LEN;
966
967 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
968 addr_length = route_length - sg_length;
969
970 ND_TCHECK_LEN(pptr, addr_length);
971 offset = strlen(buf);
972 snprintf(buf + offset, buflen - offset, ", Originator %s",
973 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
974 break;
975
976 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
977 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
978 offset = strlen(buf);
979 snprintf(buf + offset, buflen - offset, ", RD: %s",
980 bgp_vpn_rd_print(ndo, pptr));
981 pptr += BGP_VPN_RD_LEN;
982
983 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
984 break;
985
986 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
987 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
988 ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
989 offset = strlen(buf);
990 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
991 bgp_vpn_rd_print(ndo, pptr),
992 as_printf(ndo, astostr, sizeof(astostr),
993 EXTRACT_BE_U_4(pptr + BGP_VPN_RD_LEN)));
994 pptr += BGP_VPN_RD_LEN + 4;
995
996 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
997 break;
998
999 /*
1000 * no per route-type printing yet.
1001 */
1002 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
1003 default:
1004 break;
1005 }
1006
1007 return route_length + 2;
1008
1009 trunc:
1010 return -2;
1011 }
1012
1013 /*
1014 * As I remember, some versions of systems have an snprintf() that
1015 * returns -1 if the buffer would have overflowed. If the return
1016 * value is negative, set buflen to 0, to indicate that we've filled
1017 * the buffer up.
1018 *
1019 * If the return value is greater than buflen, that means that
1020 * the buffer would have overflowed; again, set buflen to 0 in
1021 * that case.
1022 */
1023 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1024 if (stringlen<0) \
1025 buflen=0; \
1026 else if ((u_int)stringlen>buflen) \
1027 buflen=0; \
1028 else { \
1029 buflen-=stringlen; \
1030 buf+=stringlen; \
1031 }
1032
1033 static int
1034 decode_labeled_vpn_l2(netdissect_options *ndo,
1035 const u_char *pptr, char *buf, u_int buflen)
1036 {
1037 int plen,tlen,stringlen,tlv_type,tlv_len,ttlv_len;
1038
1039 ND_TCHECK_2(pptr);
1040 plen=EXTRACT_BE_U_2(pptr);
1041 tlen=plen;
1042 pptr += 2;
1043 /* Old and new L2VPN NLRI share AFI/SAFI
1044 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1045 * and > 17 as old format. Complain for the middle case
1046 */
1047 if (plen==12) {
1048 /* assume AD-only with RD, BGPNH */
1049 ND_TCHECK_LEN(pptr, 12);
1050 buf[0]='\0';
1051 stringlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1052 bgp_vpn_rd_print(ndo, pptr),
1053 ipaddr_string(ndo, pptr+8)
1054 );
1055 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1056 pptr+=12;
1057 tlen-=12;
1058 return plen;
1059 } else if (plen>17) {
1060 /* assume old format */
1061 /* RD, ID, LBLKOFF, LBLBASE */
1062
1063 ND_TCHECK_LEN(pptr, 15);
1064 buf[0]='\0';
1065 stringlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1066 bgp_vpn_rd_print(ndo, pptr),
1067 EXTRACT_BE_U_2(pptr + 8),
1068 EXTRACT_BE_U_2(pptr + 10),
1069 EXTRACT_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1070 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1071 pptr+=15;
1072 tlen-=15;
1073
1074 /* ok now the variable part - lets read out TLVs*/
1075 while (tlen>0) {
1076 if (tlen < 3)
1077 return -1;
1078 ND_TCHECK_3(pptr);
1079 tlv_type=EXTRACT_U_1(pptr);
1080 pptr++;
1081 tlv_len=EXTRACT_BE_U_2(pptr);
1082 ttlv_len=tlv_len;
1083 pptr+=2;
1084
1085 switch(tlv_type) {
1086 case 1:
1087 if (buflen!=0) {
1088 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1089 tlv_type,
1090 tlv_len);
1091 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1092 }
1093 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
1094 while (ttlv_len>0) {
1095 ND_TCHECK_1(pptr);
1096 if (buflen!=0) {
1097 stringlen=snprintf(buf,buflen, "%02x",
1098 EXTRACT_U_1(pptr));
1099 pptr++;
1100 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1101 }
1102 ttlv_len--;
1103 }
1104 break;
1105 default:
1106 if (buflen!=0) {
1107 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1108 tlv_type,
1109 tlv_len);
1110 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1111 }
1112 break;
1113 }
1114 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
1115 }
1116 return plen+2;
1117
1118 } else {
1119 /* complain bitterly ? */
1120 /* fall through */
1121 goto trunc;
1122 }
1123
1124 trunc:
1125 return -2;
1126 }
1127
1128 int
1129 decode_prefix6(netdissect_options *ndo,
1130 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1131 {
1132 struct in6_addr addr;
1133 u_int plen, plenbytes;
1134
1135 ND_TCHECK_1(pd);
1136 ITEMCHECK(1);
1137 plen = EXTRACT_U_1(pd);
1138 if (128 < plen)
1139 return -1;
1140 itemlen -= 1;
1141
1142 memset(&addr, 0, sizeof(addr));
1143 plenbytes = (plen + 7) / 8;
1144 ND_TCHECK_LEN(pd + 1, plenbytes);
1145 ITEMCHECK(plenbytes);
1146 memcpy(&addr, pd + 1, plenbytes);
1147 if (plen % 8) {
1148 addr.s6_addr[plenbytes - 1] &=
1149 ((0xff00 >> (plen % 8)) & 0xff);
1150 }
1151 snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen);
1152 return 1 + plenbytes;
1153
1154 trunc:
1155 return -2;
1156
1157 badtlv:
1158 return -3;
1159 }
1160
1161 static int
1162 decode_labeled_prefix6(netdissect_options *ndo,
1163 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1164 {
1165 struct in6_addr addr;
1166 u_int plen, plenbytes;
1167
1168 /* prefix length and label = 4 bytes */
1169 ND_TCHECK_4(pptr);
1170 ITEMCHECK(4);
1171 plen = EXTRACT_U_1(pptr); /* get prefix length */
1172
1173 if (24 > plen)
1174 return -1;
1175
1176 plen -= 24; /* adjust prefixlen - labellength */
1177
1178 if (128 < plen)
1179 return -1;
1180 itemlen -= 4;
1181
1182 memset(&addr, 0, sizeof(addr));
1183 plenbytes = (plen + 7) / 8;
1184 ND_TCHECK_LEN(pptr + 4, plenbytes);
1185 memcpy(&addr, pptr + 4, plenbytes);
1186 if (plen % 8) {
1187 addr.s6_addr[plenbytes - 1] &=
1188 ((0xff00 >> (plen % 8)) & 0xff);
1189 }
1190 /* the label may get offsetted by 4 bits so lets shift it right */
1191 snprintf(buf, buflen, "%s/%d, label:%u %s",
1192 ip6addr_string(ndo, &addr),
1193 plen,
1194 EXTRACT_BE_U_3(pptr + 1)>>4,
1195 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1196
1197 return 4 + plenbytes;
1198
1199 trunc:
1200 return -2;
1201
1202 badtlv:
1203 return -3;
1204 }
1205
1206 static int
1207 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1208 const u_char *pptr, char *buf, u_int buflen)
1209 {
1210 struct in6_addr addr;
1211 u_int plen;
1212
1213 ND_TCHECK_1(pptr);
1214 plen = EXTRACT_U_1(pptr); /* get prefix length */
1215
1216 if ((24+64) > plen)
1217 return -1;
1218
1219 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1220
1221 if (128 < plen)
1222 return -1;
1223
1224 memset(&addr, 0, sizeof(addr));
1225 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1226 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1227 if (plen % 8) {
1228 addr.s6_addr[(plen + 7) / 8 - 1] &=
1229 ((0xff00 >> (plen % 8)) & 0xff);
1230 }
1231 /* the label may get offsetted by 4 bits so lets shift it right */
1232 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1233 bgp_vpn_rd_print(ndo, pptr+4),
1234 ip6addr_string(ndo, &addr),
1235 plen,
1236 EXTRACT_BE_U_3(pptr + 1)>>4,
1237 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1238
1239 return 12 + (plen + 7) / 8;
1240
1241 trunc:
1242 return -2;
1243 }
1244
1245 static int
1246 decode_clnp_prefix(netdissect_options *ndo,
1247 const u_char *pptr, char *buf, u_int buflen)
1248 {
1249 uint8_t addr[19];
1250 u_int plen;
1251
1252 ND_TCHECK_1(pptr);
1253 plen = EXTRACT_U_1(pptr); /* get prefix length */
1254
1255 if (152 < plen)
1256 return -1;
1257
1258 memset(&addr, 0, sizeof(addr));
1259 ND_TCHECK_LEN(pptr + 4, (plen + 7) / 8);
1260 memcpy(&addr, pptr + 4, (plen + 7) / 8);
1261 if (plen % 8) {
1262 addr[(plen + 7) / 8 - 1] &=
1263 ((0xff00 >> (plen % 8)) & 0xff);
1264 }
1265 snprintf(buf, buflen, "%s/%d",
1266 isonsap_string(ndo, addr,(plen + 7) / 8),
1267 plen);
1268
1269 return 1 + (plen + 7) / 8;
1270
1271 trunc:
1272 return -2;
1273 }
1274
1275 static int
1276 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1277 const u_char *pptr, char *buf, u_int buflen)
1278 {
1279 uint8_t addr[19];
1280 u_int plen;
1281
1282 ND_TCHECK_1(pptr);
1283 plen = EXTRACT_U_1(pptr); /* get prefix length */
1284
1285 if ((24+64) > plen)
1286 return -1;
1287
1288 plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
1289
1290 if (152 < plen)
1291 return -1;
1292
1293 memset(&addr, 0, sizeof(addr));
1294 ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
1295 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1296 if (plen % 8) {
1297 addr[(plen + 7) / 8 - 1] &=
1298 ((0xff00 >> (plen % 8)) & 0xff);
1299 }
1300 /* the label may get offsetted by 4 bits so lets shift it right */
1301 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1302 bgp_vpn_rd_print(ndo, pptr+4),
1303 isonsap_string(ndo, addr,(plen + 7) / 8),
1304 plen,
1305 EXTRACT_BE_U_3(pptr + 1)>>4,
1306 ((EXTRACT_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1307
1308 return 12 + (plen + 7) / 8;
1309
1310 trunc:
1311 return -2;
1312 }
1313
1314 /*
1315 * bgp_attr_get_as_size
1316 *
1317 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1318 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1319 * support, exchange AS-Path with the same path-attribute type value 0x02.
1320 */
1321 static int
1322 bgp_attr_get_as_size(netdissect_options *ndo,
1323 uint8_t bgpa_type, const u_char *pptr, int len)
1324 {
1325 const u_char *tptr = pptr;
1326
1327 /*
1328 * If the path attribute is the optional AS4 path type, then we already
1329 * know, that ASs must be encoded in 4 byte format.
1330 */
1331 if (bgpa_type == BGPTYPE_AS4_PATH) {
1332 return 4;
1333 }
1334
1335 /*
1336 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1337 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1338 * each.
1339 */
1340 while (tptr < pptr + len) {
1341 ND_TCHECK_1(tptr);
1342
1343 /*
1344 * If we do not find a valid segment type, our guess might be wrong.
1345 */
1346 if (EXTRACT_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || EXTRACT_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
1347 goto trunc;
1348 }
1349 ND_TCHECK_1(tptr + 1);
1350 tptr += 2 + EXTRACT_U_1(tptr + 1) * 2;
1351 }
1352
1353 /*
1354 * If we correctly reached end of the AS path attribute data content,
1355 * then most likely ASs were indeed encoded as 2 bytes.
1356 */
1357 if (tptr == pptr + len) {
1358 return 2;
1359 }
1360
1361 trunc:
1362
1363 /*
1364 * We can come here, either we did not have enough data, or if we
1365 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1366 * so that calller can try to decode each AS as of 4 bytes. If indeed
1367 * there was not enough data, it will crib and end the parse anyways.
1368 */
1369 return 4;
1370 }
1371
1372 /*
1373 * The only way to know that a BGP UPDATE message is using add path is
1374 * by checking if the capability is in the OPEN message which we may have missed.
1375 * So this function checks if it is possible that the update could contain add path
1376 * and if so it checks that standard BGP doesn't make sense.
1377 */
1378 static int
1379 check_add_path(const u_char *pptr, u_int length, u_int max_prefix_length)
1380 {
1381 u_int offset, prefix_length;
1382 if (length < 5) {
1383 return 0;
1384 }
1385
1386 /* check if it could be add path */
1387 for (offset = 0; offset < length;) {
1388 offset += 4;
1389 prefix_length = EXTRACT_U_1(pptr + offset);
1390 /*
1391 * Add 4 to cover the path id
1392 * and check the prefix length isn't greater than 32/128.
1393 */
1394 if (prefix_length > max_prefix_length) {
1395 return 0;
1396 }
1397 /* Add 1 for the prefix_length byte and prefix_length to cover the address */
1398 offset += 1 + ((prefix_length + 7) / 8);
1399 }
1400 /* check we haven't gone past the end of the section */
1401 if (offset > length) {
1402 return 0;
1403 }
1404
1405 /* check it's not standard BGP */
1406 for (offset = 0; offset < length; ) {
1407 prefix_length = EXTRACT_U_1(pptr + offset);
1408 /*
1409 * If the prefix_length is zero (0.0.0.0/0)
1410 * and since it's not the only address (length >= 5)
1411 * then it is add-path
1412 */
1413 if (prefix_length < 1 || prefix_length > max_prefix_length) {
1414 return 1;
1415 }
1416 offset += 1 + ((prefix_length + 7) / 8);
1417 }
1418 if (offset > length) {
1419 return 1;
1420 }
1421
1422 /* assume not add-path by default */
1423 return 0;
1424 }
1425
1426 static int
1427 bgp_attr_print(netdissect_options *ndo,
1428 u_int atype, const u_char *pptr, u_int len)
1429 {
1430 int i;
1431 uint16_t af;
1432 uint8_t safi, snpa, nhlen;
1433 union { /* copy buffer for bandwidth values */
1434 float f;
1435 uint32_t i;
1436 } bw;
1437 int advance;
1438 u_int tlen;
1439 const u_char *tptr;
1440 char buf[MAXHOSTNAMELEN + 100];
1441 int as_size;
1442 int add_path4, add_path6, path_id;
1443
1444 tptr = pptr;
1445 tlen = len;
1446
1447 switch (atype) {
1448 case BGPTYPE_ORIGIN:
1449 if (len != 1)
1450 ND_PRINT((ndo, "invalid len"));
1451 else {
1452 ND_TCHECK_1(tptr);
1453 ND_PRINT((ndo, "%s", tok2str(bgp_origin_values,
1454 "Unknown Origin Typecode",
1455 EXTRACT_U_1(tptr))));
1456 }
1457 break;
1458
1459 /*
1460 * Process AS4 byte path and AS2 byte path attributes here.
1461 */
1462 case BGPTYPE_AS4_PATH:
1463 case BGPTYPE_AS_PATH:
1464 if (len % 2) {
1465 ND_PRINT((ndo, "invalid len"));
1466 break;
1467 }
1468 if (!len) {
1469 ND_PRINT((ndo, "empty"));
1470 break;
1471 }
1472
1473 /*
1474 * BGP updates exchanged between New speakers that support 4
1475 * byte AS, ASs are always encoded in 4 bytes. There is no
1476 * definitive way to find this, just by the packet's
1477 * contents. So, check for packet's TLV's sanity assuming
1478 * 2 bytes first, and it does not pass, assume that ASs are
1479 * encoded in 4 bytes format and move on.
1480 */
1481 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1482
1483 while (tptr < pptr + len) {
1484 ND_TCHECK_1(tptr);
1485 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values,
1486 "?", EXTRACT_U_1(tptr))));
1487 ND_TCHECK_1(tptr + 1);
1488 for (i = 0; i < EXTRACT_U_1(tptr + 1) * as_size; i += as_size) {
1489 ND_TCHECK_LEN(tptr + 2 + i, as_size);
1490 ND_PRINT((ndo, "%s ",
1491 as_printf(ndo, astostr, sizeof(astostr),
1492 as_size == 2 ?
1493 EXTRACT_BE_U_2(tptr + i + 2) :
1494 EXTRACT_BE_U_4(tptr + i + 2))));
1495 }
1496 ND_TCHECK_1(tptr);
1497 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values,
1498 "?", EXTRACT_U_1(tptr))));
1499 ND_TCHECK_1(tptr + 1);
1500 tptr += 2 + EXTRACT_U_1(tptr + 1) * as_size;
1501 }
1502 break;
1503 case BGPTYPE_NEXT_HOP:
1504 if (len != 4)
1505 ND_PRINT((ndo, "invalid len"));
1506 else {
1507 ND_TCHECK_4(tptr);
1508 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1509 }
1510 break;
1511 case BGPTYPE_MULTI_EXIT_DISC:
1512 case BGPTYPE_LOCAL_PREF:
1513 if (len != 4)
1514 ND_PRINT((ndo, "invalid len"));
1515 else {
1516 ND_TCHECK_4(tptr);
1517 ND_PRINT((ndo, "%u", EXTRACT_BE_U_4(tptr)));
1518 }
1519 break;
1520 case BGPTYPE_ATOMIC_AGGREGATE:
1521 if (len != 0)
1522 ND_PRINT((ndo, "invalid len"));
1523 break;
1524 case BGPTYPE_AGGREGATOR:
1525
1526 /*
1527 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1528 * the length of this PA can be either 6 bytes or 8 bytes.
1529 */
1530 if (len != 6 && len != 8) {
1531 ND_PRINT((ndo, "invalid len"));
1532 break;
1533 }
1534 ND_TCHECK_LEN(tptr, len);
1535 if (len == 6) {
1536 ND_PRINT((ndo, " AS #%s, origin %s",
1537 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(tptr)),
1538 ipaddr_string(ndo, tptr + 2)));
1539 } else {
1540 ND_PRINT((ndo, " AS #%s, origin %s",
1541 as_printf(ndo, astostr, sizeof(astostr),
1542 EXTRACT_BE_U_4(tptr)), ipaddr_string(ndo, tptr + 4)));
1543 }
1544 break;
1545 case BGPTYPE_AGGREGATOR4:
1546 if (len != 8) {
1547 ND_PRINT((ndo, "invalid len"));
1548 break;
1549 }
1550 ND_TCHECK_8(tptr);
1551 ND_PRINT((ndo, " AS #%s, origin %s",
1552 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr)),
1553 ipaddr_string(ndo, tptr + 4)));
1554 break;
1555 case BGPTYPE_COMMUNITIES:
1556 if (len % 4) {
1557 ND_PRINT((ndo, "invalid len"));
1558 break;
1559 }
1560 while (tlen>0) {
1561 uint32_t comm;
1562 ND_TCHECK_4(tptr);
1563 comm = EXTRACT_BE_U_4(tptr);
1564 switch (comm) {
1565 case BGP_COMMUNITY_NO_EXPORT:
1566 ND_PRINT((ndo, " NO_EXPORT"));
1567 break;
1568 case BGP_COMMUNITY_NO_ADVERT:
1569 ND_PRINT((ndo, " NO_ADVERTISE"));
1570 break;
1571 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1572 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1573 break;
1574 default:
1575 ND_PRINT((ndo, "%u:%u%s",
1576 (comm >> 16) & 0xffff,
1577 comm & 0xffff,
1578 (tlen>4) ? ", " : ""));
1579 break;
1580 }
1581 tlen -=4;
1582 tptr +=4;
1583 }
1584 break;
1585 case BGPTYPE_ORIGINATOR_ID:
1586 if (len != 4) {
1587 ND_PRINT((ndo, "invalid len"));
1588 break;
1589 }
1590 ND_TCHECK_4(tptr);
1591 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1592 break;
1593 case BGPTYPE_CLUSTER_LIST:
1594 if (len % 4) {
1595 ND_PRINT((ndo, "invalid len"));
1596 break;
1597 }
1598 while (tlen>0) {
1599 ND_TCHECK_4(tptr);
1600 ND_PRINT((ndo, "%s%s",
1601 ipaddr_string(ndo, tptr),
1602 (tlen>4) ? ", " : ""));
1603 tlen -=4;
1604 tptr +=4;
1605 }
1606 break;
1607 case BGPTYPE_MP_REACH_NLRI:
1608 ND_TCHECK_3(tptr);
1609 af = EXTRACT_BE_U_2(tptr);
1610 safi = EXTRACT_U_1(tptr + 2);
1611
1612 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1613 tok2str(af_values, "Unknown AFI", af),
1614 af,
1615 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1616 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1617 safi));
1618
1619 switch(af<<8 | safi) {
1620 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1621 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1622 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1623 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1624 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1625 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1626 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1627 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1628 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1629 case (AFNUM_INET<<8 | SAFNUM_MDT):
1630 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1631 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1632 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1633 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1634 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1635 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1636 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1637 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1638 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1639 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1640 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1641 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1642 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1643 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1644 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1645 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1646 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1647 break;
1648 default:
1649 ND_TCHECK_LEN(tptr, tlen);
1650 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1651 if (ndo->ndo_vflag <= 1)
1652 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1653 goto done;
1654 break;
1655 }
1656
1657 tptr +=3;
1658
1659 ND_TCHECK_1(tptr);
1660 nhlen = EXTRACT_U_1(tptr);
1661 tlen = nhlen;
1662 tptr++;
1663
1664 if (tlen) {
1665 int nnh = 0;
1666 ND_PRINT((ndo, "\n\t nexthop: "));
1667 while (tlen > 0) {
1668 if (nnh++ > 0) {
1669 ND_PRINT((ndo, ", " ));
1670 }
1671 switch(af<<8 | safi) {
1672 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1673 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1674 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1675 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1676 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1677 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1678 case (AFNUM_INET<<8 | SAFNUM_MDT):
1679 if (tlen < sizeof(struct in_addr)) {
1680 ND_PRINT((ndo, "invalid len"));
1681 tlen = 0;
1682 } else {
1683 ND_TCHECK_LEN(tptr, sizeof(struct in_addr));
1684 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1685 tlen -= sizeof(struct in_addr);
1686 tptr += sizeof(struct in_addr);
1687 }
1688 break;
1689 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1690 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1691 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1692 if (tlen < sizeof(struct in_addr)+BGP_VPN_RD_LEN) {
1693 ND_PRINT((ndo, "invalid len"));
1694 tlen = 0;
1695 } else {
1696 ND_TCHECK_LEN(tptr,
1697 sizeof(struct in_addr) + BGP_VPN_RD_LEN);
1698 ND_PRINT((ndo, "RD: %s, %s",
1699 bgp_vpn_rd_print(ndo, tptr),
1700 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1701 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1702 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1703 }
1704 break;
1705 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1706 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1707 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1708 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1709 if (tlen < sizeof(struct in6_addr)) {
1710 ND_PRINT((ndo, "invalid len"));
1711 tlen = 0;
1712 } else {
1713 ND_TCHECK_LEN(tptr, sizeof(struct in6_addr));
1714 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr)));
1715 tlen -= sizeof(struct in6_addr);
1716 tptr += sizeof(struct in6_addr);
1717 }
1718 break;
1719 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1720 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1721 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1722 if (tlen < sizeof(struct in6_addr)+BGP_VPN_RD_LEN) {
1723 ND_PRINT((ndo, "invalid len"));
1724 tlen = 0;
1725 } else {
1726 ND_TCHECK_LEN(tptr,
1727 sizeof(struct in6_addr) + BGP_VPN_RD_LEN);
1728 ND_PRINT((ndo, "RD: %s, %s",
1729 bgp_vpn_rd_print(ndo, tptr),
1730 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1731 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1732 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1733 }
1734 break;
1735 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1736 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1737 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1738 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1739 if (tlen < sizeof(struct in_addr)) {
1740 ND_PRINT((ndo, "invalid len"));
1741 tlen = 0;
1742 } else {
1743 ND_TCHECK_LEN(tptr, sizeof(struct in_addr));
1744 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1745 tlen -= (sizeof(struct in_addr));
1746 tptr += (sizeof(struct in_addr));
1747 }
1748 break;
1749 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1750 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1751 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1752 ND_TCHECK_LEN(tptr, tlen);
1753 ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen)));
1754 tptr += tlen;
1755 tlen = 0;
1756 break;
1757
1758 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1759 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1760 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1761 if (tlen < BGP_VPN_RD_LEN+1) {
1762 ND_PRINT((ndo, "invalid len"));
1763 tlen = 0;
1764 } else {
1765 ND_TCHECK_LEN(tptr, tlen);
1766 ND_PRINT((ndo, "RD: %s, %s",
1767 bgp_vpn_rd_print(ndo, tptr),
1768 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1769 /* rfc986 mapped IPv4 address ? */
1770 if (EXTRACT_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
1771 ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4)));
1772 /* rfc1888 mapped IPv6 address ? */
1773 else if (EXTRACT_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
1774 ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3)));
1775 tptr += tlen;
1776 tlen = 0;
1777 }
1778 break;
1779 default:
1780 ND_TCHECK_LEN(tptr, tlen);
1781 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1782 if (ndo->ndo_vflag <= 1)
1783 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1784 tptr += tlen;
1785 tlen = 0;
1786 goto done;
1787 break;
1788 }
1789 }
1790 }
1791 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1792 tptr += tlen;
1793
1794 ND_TCHECK_1(tptr);
1795 snpa = EXTRACT_U_1(tptr);
1796 tptr++;
1797
1798 if (snpa) {
1799 ND_PRINT((ndo, "\n\t %u SNPA", snpa));
1800 for (/*nothing*/; snpa > 0; snpa--) {
1801 ND_TCHECK_1(tptr);
1802 ND_PRINT((ndo, "\n\t %d bytes", EXTRACT_U_1(tptr)));
1803 tptr += EXTRACT_U_1(tptr) + 1;
1804 }
1805 } else {
1806 ND_PRINT((ndo, ", no SNPA"));
1807 }
1808
1809 add_path4 = check_add_path(tptr, (len-(tptr - pptr)), 32);
1810 add_path6 = check_add_path(tptr, (len-(tptr - pptr)), 128);
1811
1812 while (tptr < pptr + len) {
1813 switch (af<<8 | safi) {
1814 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1815 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1816 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1817 if (add_path4) {
1818 path_id = EXTRACT_BE_U_4(tptr);
1819 tptr += 4;
1820 }
1821 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1822 if (advance == -1)
1823 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1824 else if (advance == -2)
1825 goto trunc;
1826 else if (advance == -3)
1827 break; /* bytes left, but not enough */
1828 else
1829 ND_PRINT((ndo, "\n\t %s", buf));
1830 if (add_path4) {
1831 ND_PRINT((ndo, " Path Id: %d", path_id));
1832 }
1833 break;
1834 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1835 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1836 if (advance == -1)
1837 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1838 else if (advance == -2)
1839 goto trunc;
1840 else if (advance == -3)
1841 break; /* bytes left, but not enough */
1842 else
1843 ND_PRINT((ndo, "\n\t %s", buf));
1844 break;
1845 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1846 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1847 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1848 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1849 if (advance == -1)
1850 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1851 else if (advance == -2)
1852 goto trunc;
1853 else
1854 ND_PRINT((ndo, "\n\t %s", buf));
1855 break;
1856 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1857 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf));
1858 if (advance == -1)
1859 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1860 else if (advance == -2)
1861 goto trunc;
1862 else
1863 ND_PRINT((ndo, "\n\t %s", buf));
1864 break;
1865 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1866 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1867 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1868 if (advance == -1)
1869 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1870 else if (advance == -2)
1871 goto trunc;
1872 else
1873 ND_PRINT((ndo, "\n\t %s", buf));
1874 break;
1875
1876 case (AFNUM_INET<<8 | SAFNUM_MDT):
1877 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1878 if (advance == -1)
1879 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1880 else if (advance == -2)
1881 goto trunc;
1882 else
1883 ND_PRINT((ndo, "\n\t %s", buf));
1884 break;
1885 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1886 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1887 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1888 if (add_path6) {
1889 path_id = EXTRACT_BE_U_4(tptr);
1890 tptr += 4;
1891 }
1892 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1893 if (advance == -1)
1894 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1895 else if (advance == -2)
1896 goto trunc;
1897 else if (advance == -3)
1898 break; /* bytes left, but not enough */
1899 else
1900 ND_PRINT((ndo, "\n\t %s", buf));
1901 if (add_path6) {
1902 ND_PRINT((ndo, " Path Id: %d", path_id));
1903 }
1904 break;
1905 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1906 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1907 if (advance == -1)
1908 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1909 else if (advance == -2)
1910 goto trunc;
1911 else if (advance == -3)
1912 break; /* bytes left, but not enough */
1913 else
1914 ND_PRINT((ndo, "\n\t %s", buf));
1915 break;
1916 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1917 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1918 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1919 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1920 if (advance == -1)
1921 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1922 else if (advance == -2)
1923 goto trunc;
1924 else
1925 ND_PRINT((ndo, "\n\t %s", buf));
1926 break;
1927 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1928 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1929 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1930 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1931 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1932 if (advance == -1)
1933 ND_PRINT((ndo, "\n\t (illegal length)"));
1934 else if (advance == -2)
1935 goto trunc;
1936 else
1937 ND_PRINT((ndo, "\n\t %s", buf));
1938 break;
1939 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1940 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1941 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1942 advance = decode_clnp_prefix(ndo, tptr, 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
1948 ND_PRINT((ndo, "\n\t %s", buf));
1949 break;
1950 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1951 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1952 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1953 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1954 if (advance == -1)
1955 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1956 else if (advance == -2)
1957 goto trunc;
1958 else
1959 ND_PRINT((ndo, "\n\t %s", buf));
1960 break;
1961 default:
1962 ND_TCHECK_LEN(tptr, tlen);
1963 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1964 if (ndo->ndo_vflag <= 1)
1965 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1966 advance = 0;
1967 tptr = pptr + len;
1968 break;
1969 }
1970 if (advance < 0)
1971 break;
1972 tptr += advance;
1973 }
1974 done:
1975 break;
1976
1977 case BGPTYPE_MP_UNREACH_NLRI:
1978 ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
1979 af = EXTRACT_BE_U_2(tptr);
1980 safi = EXTRACT_U_1(tptr + 2);
1981
1982 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1983 tok2str(af_values, "Unknown AFI", af),
1984 af,
1985 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1986 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1987 safi));
1988
1989 if (len == BGP_MP_NLRI_MINSIZE)
1990 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
1991
1992 tptr += 3;
1993
1994 add_path4 = check_add_path(tptr, (len-(tptr - pptr)), 32);
1995 add_path6 = check_add_path(tptr, (len-(tptr - pptr)), 128);
1996
1997 while (tptr < pptr + len) {
1998 switch (af<<8 | safi) {
1999 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
2000 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
2001 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
2002 if (add_path4) {
2003 path_id = EXTRACT_BE_U_4(tptr);
2004 tptr += 4;
2005 }
2006 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
2007 if (advance == -1)
2008 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2009 else if (advance == -2)
2010 goto trunc;
2011 else if (advance == -3)
2012 break; /* bytes left, but not enough */
2013 else
2014 ND_PRINT((ndo, "\n\t %s", buf));
2015 if (add_path4) {
2016 ND_PRINT((ndo, " Path Id: %d", path_id));
2017 }
2018 break;
2019 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
2020 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
2021 if (advance == -1)
2022 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2023 else if (advance == -2)
2024 goto trunc;
2025 else if (advance == -3)
2026 break; /* bytes left, but not enough */
2027 else
2028 ND_PRINT((ndo, "\n\t %s", buf));
2029 break;
2030 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
2031 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
2032 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
2033 advance = decode_labeled_vpn_prefix4(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_INET6<<8 | SAFNUM_UNICAST):
2042 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
2043 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
2044 if (add_path6) {
2045 path_id = EXTRACT_BE_U_4(tptr);
2046 tptr += 4;
2047 }
2048 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
2049 if (advance == -1)
2050 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2051 else if (advance == -2)
2052 goto trunc;
2053 else if (advance == -3)
2054 break; /* bytes left, but not enough */
2055 else
2056 ND_PRINT((ndo, "\n\t %s", buf));
2057 if (add_path6) {
2058 ND_PRINT((ndo, " Path Id: %d", path_id));
2059 }
2060 break;
2061 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
2062 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
2063 if (advance == -1)
2064 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2065 else if (advance == -2)
2066 goto trunc;
2067 else if (advance == -3)
2068 break; /* bytes left, but not enough */
2069 else
2070 ND_PRINT((ndo, "\n\t %s", buf));
2071 break;
2072 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
2073 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
2074 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
2075 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
2076 if (advance == -1)
2077 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2078 else if (advance == -2)
2079 goto trunc;
2080 else
2081 ND_PRINT((ndo, "\n\t %s", buf));
2082 break;
2083 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
2084 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
2085 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
2086 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2087 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
2088 if (advance == -1)
2089 ND_PRINT((ndo, "\n\t (illegal length)"));
2090 else if (advance == -2)
2091 goto trunc;
2092 else
2093 ND_PRINT((ndo, "\n\t %s", buf));
2094 break;
2095 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2096 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2097 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2098 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2099 if (advance == -1)
2100 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2101 else if (advance == -2)
2102 goto trunc;
2103 else
2104 ND_PRINT((ndo, "\n\t %s", buf));
2105 break;
2106 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2107 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2108 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2109 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2110 if (advance == -1)
2111 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2112 else if (advance == -2)
2113 goto trunc;
2114 else
2115 ND_PRINT((ndo, "\n\t %s", buf));
2116 break;
2117 case (AFNUM_INET<<8 | SAFNUM_MDT):
2118 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
2119 if (advance == -1)
2120 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2121 else if (advance == -2)
2122 goto trunc;
2123 else
2124 ND_PRINT((ndo, "\n\t %s", buf));
2125 break;
2126 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
2127 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
2128 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
2129 if (advance == -1)
2130 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2131 else if (advance == -2)
2132 goto trunc;
2133 else
2134 ND_PRINT((ndo, "\n\t %s", buf));
2135 break;
2136 default:
2137 ND_TCHECK_LEN(tptr - 3, tlen);
2138 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
2139 if (ndo->ndo_vflag <= 1)
2140 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
2141 advance = 0;
2142 tptr = pptr + len;
2143 break;
2144 }
2145 if (advance < 0)
2146 break;
2147 tptr += advance;
2148 }
2149 break;
2150 case BGPTYPE_EXTD_COMMUNITIES:
2151 if (len % 8) {
2152 ND_PRINT((ndo, "invalid len"));
2153 break;
2154 }
2155 while (tlen>0) {
2156 uint16_t extd_comm;
2157
2158 ND_TCHECK_2(tptr);
2159 extd_comm=EXTRACT_BE_U_2(tptr);
2160
2161 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]",
2162 tok2str(bgp_extd_comm_subtype_values,
2163 "unknown extd community typecode",
2164 extd_comm),
2165 extd_comm,
2166 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2167
2168 ND_TCHECK_6(tptr + 2);
2169 switch(extd_comm) {
2170 case BGP_EXT_COM_RT_0:
2171 case BGP_EXT_COM_RO_0:
2172 case BGP_EXT_COM_L2VPN_RT_0:
2173 ND_PRINT((ndo, ": %u:%u (= %s)",
2174 EXTRACT_BE_U_2(tptr + 2),
2175 EXTRACT_BE_U_4(tptr + 4),
2176 ipaddr_string(ndo, tptr+4)));
2177 break;
2178 case BGP_EXT_COM_RT_1:
2179 case BGP_EXT_COM_RO_1:
2180 case BGP_EXT_COM_L2VPN_RT_1:
2181 case BGP_EXT_COM_VRF_RT_IMP:
2182 ND_PRINT((ndo, ": %s:%u",
2183 ipaddr_string(ndo, tptr+2),
2184 EXTRACT_BE_U_2(tptr + 6)));
2185 break;
2186 case BGP_EXT_COM_RT_2:
2187 case BGP_EXT_COM_RO_2:
2188 ND_PRINT((ndo, ": %s:%u",
2189 as_printf(ndo, astostr, sizeof(astostr),
2190 EXTRACT_BE_U_4(tptr + 2)), EXTRACT_BE_U_2(tptr + 6)));
2191 break;
2192 case BGP_EXT_COM_LINKBAND:
2193 bw.i = EXTRACT_BE_U_4(tptr + 2);
2194 ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2195 bw.f*8/1000000));
2196 break;
2197 case BGP_EXT_COM_VPN_ORIGIN:
2198 case BGP_EXT_COM_VPN_ORIGIN2:
2199 case BGP_EXT_COM_VPN_ORIGIN3:
2200 case BGP_EXT_COM_VPN_ORIGIN4:
2201 case BGP_EXT_COM_OSPF_RID:
2202 case BGP_EXT_COM_OSPF_RID2:
2203 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2)));
2204 break;
2205 case BGP_EXT_COM_OSPF_RTYPE:
2206 case BGP_EXT_COM_OSPF_RTYPE2:
2207 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2208 ipaddr_string(ndo, tptr+2),
2209 tok2str(bgp_extd_comm_ospf_rtype_values,
2210 "unknown (0x%02x)",
2211 EXTRACT_U_1((tptr + 6))),
2212 (EXTRACT_U_1(tptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2213 ((EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_EXT) || (EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2214 break;
2215 case BGP_EXT_COM_L2INFO:
2216 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2217 tok2str(l2vpn_encaps_values,
2218 "unknown encaps",
2219 EXTRACT_U_1((tptr + 2))),
2220 EXTRACT_U_1((tptr + 3)),
2221 EXTRACT_BE_U_2(tptr + 4)));
2222 break;
2223 case BGP_EXT_COM_SOURCE_AS:
2224 ND_PRINT((ndo, ": AS %u", EXTRACT_BE_U_2(tptr + 2)));
2225 break;
2226 default:
2227 ND_TCHECK_8(tptr);
2228 print_unknown_data(ndo, tptr, "\n\t ", 8);
2229 break;
2230 }
2231 tlen -= 8;
2232 tptr += 8;
2233 }
2234 break;
2235
2236 case BGPTYPE_PMSI_TUNNEL:
2237 {
2238 uint8_t tunnel_type, flags;
2239
2240 ND_TCHECK_5(tptr);
2241 flags = EXTRACT_U_1(tptr);
2242 tunnel_type = EXTRACT_U_1(tptr + 1);
2243 tlen = len;
2244
2245 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2246 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2247 tunnel_type,
2248 bittok2str(bgp_pmsi_flag_values, "none", flags),
2249 EXTRACT_BE_U_3(tptr + 2)>>4));
2250
2251 tptr +=5;
2252 tlen -= 5;
2253
2254 switch (tunnel_type) {
2255 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2256 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2257 ND_TCHECK_8(tptr);
2258 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s",
2259 ipaddr_string(ndo, tptr),
2260 ipaddr_string(ndo, tptr+4)));
2261 break;
2262
2263 case BGP_PMSI_TUNNEL_PIM_SSM:
2264 ND_TCHECK_8(tptr);
2265 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s",
2266 ipaddr_string(ndo, tptr),
2267 ipaddr_string(ndo, tptr+4)));
2268 break;
2269 case BGP_PMSI_TUNNEL_INGRESS:
2270 ND_TCHECK_4(tptr);
2271 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s",
2272 ipaddr_string(ndo, tptr)));
2273 break;
2274 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2275 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2276 ND_TCHECK_8(tptr);
2277 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x",
2278 ipaddr_string(ndo, tptr),
2279 EXTRACT_BE_U_4(tptr + 4)));
2280 break;
2281 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2282 ND_TCHECK_8(tptr);
2283 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2284 ipaddr_string(ndo, tptr),
2285 EXTRACT_BE_U_4(tptr + 4)));
2286 break;
2287 default:
2288 if (ndo->ndo_vflag <= 1) {
2289 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2290 }
2291 }
2292 break;
2293 }
2294 case BGPTYPE_AIGP:
2295 {
2296 uint8_t type;
2297 uint16_t length;
2298
2299 tlen = len;
2300
2301 while (tlen >= 3) {
2302
2303 ND_TCHECK_3(tptr);
2304
2305 type = EXTRACT_U_1(tptr);
2306 length = EXTRACT_BE_U_2(tptr + 1);
2307 tptr += 3;
2308 tlen -= 3;
2309
2310 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u",
2311 tok2str(bgp_aigp_values, "Unknown", type),
2312 type, length));
2313
2314 if (length < 3)
2315 goto trunc;
2316 length -= 3;
2317
2318 /*
2319 * Check if we can read the TLV data.
2320 */
2321 ND_TCHECK_LEN(tptr + 3, length);
2322
2323 switch (type) {
2324
2325 case BGP_AIGP_TLV:
2326 if (length < 8)
2327 goto trunc;
2328 ND_PRINT((ndo, ", metric %" PRIu64,
2329 EXTRACT_BE_U_8(tptr)));
2330 break;
2331
2332 default:
2333 if (ndo->ndo_vflag <= 1) {
2334 print_unknown_data(ndo, tptr,"\n\t ", length);
2335 }
2336 }
2337
2338 tptr += length;
2339 tlen -= length;
2340 }
2341 break;
2342 }
2343 case BGPTYPE_ATTR_SET:
2344 ND_TCHECK_4(tptr);
2345 if (len < 4)
2346 goto trunc;
2347 ND_PRINT((ndo, "\n\t Origin AS: %s",
2348 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr))));
2349 tptr += 4;
2350 len -= 4;
2351
2352 while (len) {
2353 u_int aflags, alenlen, alen;
2354
2355 ND_TCHECK_2(tptr);
2356 if (len < 2)
2357 goto trunc;
2358 aflags = EXTRACT_U_1(tptr);
2359 atype = EXTRACT_U_1(tptr + 1);
2360 tptr += 2;
2361 len -= 2;
2362 alenlen = bgp_attr_lenlen(aflags, tptr);
2363 ND_TCHECK_LEN(tptr, alenlen);
2364 if (len < alenlen)
2365 goto trunc;
2366 alen = bgp_attr_len(aflags, tptr);
2367 tptr += alenlen;
2368 len -= alenlen;
2369
2370 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2371 tok2str(bgp_attr_values,
2372 "Unknown Attribute", atype),
2373 atype,
2374 alen));
2375
2376 if (aflags) {
2377 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2378 aflags & 0x80 ? "O" : "",
2379 aflags & 0x40 ? "T" : "",
2380 aflags & 0x20 ? "P" : "",
2381 aflags & 0x10 ? "E" : ""));
2382 if (aflags & 0xf)
2383 ND_PRINT((ndo, "+%x", aflags & 0xf));
2384 ND_PRINT((ndo, "]: "));
2385 }
2386 /* FIXME check for recursion */
2387 if (!bgp_attr_print(ndo, atype, tptr, alen))
2388 return 0;
2389 tptr += alen;
2390 len -= alen;
2391 }
2392 break;
2393
2394 case BGPTYPE_LARGE_COMMUNITY:
2395 if (len == 0 || len % 12) {
2396 ND_PRINT((ndo, "invalid len"));
2397 break;
2398 }
2399 ND_PRINT((ndo, "\n\t "));
2400 while (len > 0) {
2401 ND_TCHECK_LEN(tptr, 12);
2402 ND_PRINT((ndo, "%u:%u:%u%s",
2403 EXTRACT_BE_U_4(tptr),
2404 EXTRACT_BE_U_4(tptr + 4),
2405 EXTRACT_BE_U_4(tptr + 8),
2406 (len > 12) ? ", " : ""));
2407 tptr += 12;
2408 len -= 12;
2409 }
2410 break;
2411 default:
2412 ND_TCHECK_LEN(pptr, len);
2413 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2414 if (ndo->ndo_vflag <= 1)
2415 print_unknown_data(ndo, pptr, "\n\t ", len);
2416 break;
2417 }
2418 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2419 ND_TCHECK_LEN(pptr, len);
2420 print_unknown_data(ndo, pptr, "\n\t ", len);
2421 }
2422 return 1;
2423
2424 trunc:
2425 return 0;
2426 }
2427
2428 static void
2429 bgp_capabilities_print(netdissect_options *ndo,
2430 const u_char *opt, u_int caps_len)
2431 {
2432 u_int cap_type, cap_len, tcap_len, cap_offset;
2433 u_int i = 0;
2434
2435 while (i < caps_len) {
2436 ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
2437 cap_type=EXTRACT_U_1(opt + i);
2438 cap_len=EXTRACT_U_1(opt + i + 1);
2439 tcap_len=cap_len;
2440 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2441 tok2str(bgp_capcode_values, "Unknown", cap_type),
2442 cap_type,
2443 cap_len));
2444 ND_TCHECK_LEN(opt + 2 + i, cap_len);
2445 switch (cap_type) {
2446 case BGP_CAPCODE_MP:
2447 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2448 tok2str(af_values, "Unknown", EXTRACT_BE_U_2(opt + i + 2)),
2449 EXTRACT_BE_U_2(opt + i + 2),
2450 tok2str(bgp_safi_values, "Unknown", EXTRACT_U_1(opt + i + 5)),
2451 EXTRACT_U_1(opt + i + 5)));
2452 break;
2453 case BGP_CAPCODE_RESTART:
2454 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2455 ((EXTRACT_U_1(opt + i + 2))&0x80) ? "R" : "none",
2456 EXTRACT_BE_U_2(opt + i + 2)&0xfff));
2457 tcap_len-=2;
2458 cap_offset=4;
2459 while(tcap_len>=4) {
2460 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2461 tok2str(af_values,"Unknown",
2462 EXTRACT_BE_U_2(opt + i + cap_offset)),
2463 EXTRACT_BE_U_2(opt + i + cap_offset),
2464 tok2str(bgp_safi_values,"Unknown",
2465 EXTRACT_U_1(opt + i + cap_offset + 2)),
2466 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2467 ((EXTRACT_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" ));
2468 tcap_len -= 4;
2469 cap_offset += 4;
2470 }
2471 break;
2472 case BGP_CAPCODE_RR:
2473 case BGP_CAPCODE_RR_CISCO:
2474 break;
2475 case BGP_CAPCODE_AS_NEW:
2476
2477 /*
2478 * Extract the 4 byte AS number encoded.
2479 */
2480 if (cap_len == 4) {
2481 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2482 as_printf(ndo, astostr, sizeof(astostr),
2483 EXTRACT_BE_U_4(opt + i + 2))));
2484 }
2485 break;
2486 case BGP_CAPCODE_ADD_PATH:
2487 cap_offset=2;
2488 if (tcap_len == 0) {
2489 ND_PRINT((ndo, " (bogus)")); /* length */
2490 break;
2491 }
2492 while (tcap_len > 0) {
2493 if (tcap_len < 4) {
2494 ND_PRINT((ndo, "\n\t\t(invalid)"));
2495 break;
2496 }
2497 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2498 tok2str(af_values,"Unknown",EXTRACT_BE_U_2(opt + i + cap_offset)),
2499 EXTRACT_BE_U_2(opt + i + cap_offset),
2500 tok2str(bgp_safi_values,"Unknown",EXTRACT_U_1(opt + i + cap_offset + 2)),
2501 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2502 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",EXTRACT_U_1(opt + i + cap_offset + 3))
2503 ));
2504 tcap_len -= 4;
2505 cap_offset += 4;
2506 }
2507 break;
2508 default:
2509 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2510 cap_type));
2511 if (ndo->ndo_vflag <= 1)
2512 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2513 cap_len);
2514 break;
2515 }
2516 if (ndo->ndo_vflag > 1 && cap_len > 0) {
2517 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2518 }
2519 i += BGP_CAP_HEADER_SIZE + cap_len;
2520 }
2521 return;
2522
2523 trunc:
2524 ND_PRINT((ndo, "[|BGP]"));
2525 }
2526
2527 static void
2528 bgp_open_print(netdissect_options *ndo,
2529 const u_char *dat, u_int length)
2530 {
2531 const struct bgp_open *bgp_open_header;
2532 u_int optslen;
2533 const struct bgp_opt *bgpopt;
2534 const u_char *opt;
2535 u_int i;
2536
2537 ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
2538 if (length < BGP_OPEN_SIZE)
2539 goto trunc;
2540
2541 bgp_open_header = (const struct bgp_open *)dat;
2542
2543 ND_PRINT((ndo, "\n\t Version %u, ",
2544 EXTRACT_U_1(bgp_open_header->bgpo_version)));
2545 ND_PRINT((ndo, "my AS %s, ",
2546 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(bgp_open_header->bgpo_myas))));
2547 ND_PRINT((ndo, "Holdtime %us, ",
2548 EXTRACT_BE_U_2(bgp_open_header->bgpo_holdtime)));
2549 ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgp_open_header->bgpo_id)));
2550 optslen = EXTRACT_U_1(bgp_open_header->bgpo_optlen);
2551 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", optslen));
2552
2553 opt = dat + BGP_OPEN_SIZE;
2554 length -= BGP_OPEN_SIZE;
2555
2556 i = 0;
2557 while (i < optslen) {
2558 uint8_t opt_type, opt_len;
2559
2560 ND_TCHECK_LEN(opt + i, BGP_OPT_SIZE);
2561 if (length < BGP_OPT_SIZE + i)
2562 goto trunc;
2563 bgpopt = (const struct bgp_opt *)(opt + i);
2564 opt_type = EXTRACT_U_1(bgpopt->bgpopt_type);
2565 opt_len = EXTRACT_U_1(bgpopt->bgpopt_len);
2566 if (BGP_OPT_SIZE + i + opt_len > optslen) {
2567 ND_PRINT((ndo, "\n\t Option %u, length: %u, goes past the end of the options",
2568 opt_type, opt_len));
2569 break;
2570 }
2571
2572 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u",
2573 tok2str(bgp_opt_values,"Unknown",opt_type),
2574 opt_type,
2575 opt_len));
2576
2577 /* now let's decode the options we know*/
2578 switch(opt_type) {
2579
2580 case BGP_OPT_CAP:
2581 bgp_capabilities_print(ndo, opt + BGP_OPT_SIZE + i,
2582 opt_len);
2583 break;
2584
2585 case BGP_OPT_AUTH:
2586 default:
2587 ND_PRINT((ndo, "\n\t no decoder for option %u",
2588 opt_type));
2589 break;
2590 }
2591 i += BGP_OPT_SIZE + opt_len;
2592 }
2593 return;
2594 trunc:
2595 ND_PRINT((ndo, "[|BGP]"));
2596 }
2597
2598 static void
2599 bgp_update_print(netdissect_options *ndo,
2600 const u_char *dat, int length)
2601 {
2602 const struct bgp *bgp_header;
2603 const u_char *p;
2604 int withdrawn_routes_len;
2605 char buf[MAXHOSTNAMELEN + 100];
2606 int wpfx;
2607 int len;
2608 int i;
2609 int add_path;
2610 int path_id;
2611
2612 ND_TCHECK_LEN(dat, BGP_SIZE);
2613 if (length < BGP_SIZE)
2614 goto trunc;
2615 bgp_header = (const struct bgp *)dat;
2616 p = dat + BGP_SIZE;
2617 length -= BGP_SIZE;
2618
2619 /* Unfeasible routes */
2620 ND_TCHECK_2(p);
2621 if (length < 2)
2622 goto trunc;
2623 withdrawn_routes_len = EXTRACT_BE_U_2(p);
2624 p += 2;
2625 length -= 2;
2626 if (withdrawn_routes_len > 1) {
2627 /*
2628 * Without keeping state from the original NLRI message,
2629 * it's not possible to tell if this a v4 or v6 route,
2630 * so only try to decode it if we're not v6 enabled.
2631 */
2632 ND_TCHECK_LEN(p, withdrawn_routes_len);
2633 if (length < withdrawn_routes_len)
2634 goto trunc;
2635 ND_PRINT((ndo, "\n\t Withdrawn routes:"));
2636 add_path = check_add_path(p, withdrawn_routes_len, 32);
2637 while (withdrawn_routes_len > 0) {
2638 if (add_path) {
2639 path_id = EXTRACT_BE_U_4(p);
2640 p += 4;
2641 length -= 4;
2642 withdrawn_routes_len -= 4;
2643 }
2644 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
2645 if (wpfx == -1) {
2646 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2647 break;
2648 } else if (wpfx == -2)
2649 goto trunc;
2650 else if (wpfx == -3)
2651 goto trunc; /* bytes left, but not enough */
2652 else {
2653 ND_PRINT((ndo, "\n\t %s", buf));
2654 if (add_path) {
2655 ND_PRINT((ndo, " Path Id: %d", path_id));
2656 }
2657 p += wpfx;
2658 length -= wpfx;
2659 withdrawn_routes_len -= wpfx;
2660 }
2661 }
2662 } else {
2663 p += withdrawn_routes_len;
2664 length -= withdrawn_routes_len;
2665 }
2666
2667 ND_TCHECK_2(p);
2668 if (length < 2)
2669 goto trunc;
2670 len = EXTRACT_BE_U_2(p);
2671 p += 2;
2672 length -= 2;
2673
2674 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2675 /* No withdrawn routes, no path attributes, no NLRI */
2676 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2677 return;
2678 }
2679
2680 if (len) {
2681 /* do something more useful!*/
2682 while (len) {
2683 int aflags, atype, alenlen, alen;
2684
2685 ND_TCHECK_2(p);
2686 if (len < 2)
2687 goto trunc;
2688 if (length < 2)
2689 goto trunc;
2690 aflags = EXTRACT_U_1(p);
2691 atype = EXTRACT_U_1(p + 1);
2692 p += 2;
2693 len -= 2;
2694 length -= 2;
2695 alenlen = bgp_attr_lenlen(aflags, p);
2696 ND_TCHECK_LEN(p, alenlen);
2697 if (len < alenlen)
2698 goto trunc;
2699 if (length < alenlen)
2700 goto trunc;
2701 alen = bgp_attr_len(aflags, p);
2702 p += alenlen;
2703 len -= alenlen;
2704 length -= alenlen;
2705
2706 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2707 tok2str(bgp_attr_values, "Unknown Attribute", atype),
2708 atype,
2709 alen));
2710
2711 if (aflags) {
2712 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2713 aflags & 0x80 ? "O" : "",
2714 aflags & 0x40 ? "T" : "",
2715 aflags & 0x20 ? "P" : "",
2716 aflags & 0x10 ? "E" : ""));
2717 if (aflags & 0xf)
2718 ND_PRINT((ndo, "+%x", aflags & 0xf));
2719 ND_PRINT((ndo, "]: "));
2720 }
2721 if (len < alen)
2722 goto trunc;
2723 if (length < alen)
2724 goto trunc;
2725 if (!bgp_attr_print(ndo, atype, p, alen))
2726 goto trunc;
2727 p += alen;
2728 len -= alen;
2729 length -= alen;
2730 }
2731 }
2732
2733 if (length) {
2734 add_path = check_add_path(p, length, 32);
2735 ND_PRINT((ndo, "\n\t Updated routes:"));
2736 while (length > 0) {
2737 if (add_path) {
2738 path_id = EXTRACT_BE_U_4(p);
2739 p += 4;
2740 length -= 4;
2741 }
2742 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2743 if (i == -1) {
2744 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2745 break;
2746 } else if (i == -2)
2747 goto trunc;
2748 else if (i == -3)
2749 goto trunc; /* bytes left, but not enough */
2750 else {
2751 ND_PRINT((ndo, "\n\t %s", buf));
2752 if (add_path) {
2753 ND_PRINT((ndo, " Path Id: %d", path_id));
2754 }
2755 p += i;
2756 length -= i;
2757 }
2758 }
2759 }
2760 return;
2761 trunc:
2762 ND_PRINT((ndo, "[|BGP]"));
2763 }
2764
2765 static void
2766 bgp_notification_print(netdissect_options *ndo,
2767 const u_char *dat, int length)
2768 {
2769 const struct bgp_notification *bgp_notification_header;
2770 const u_char *tptr;
2771 uint8_t bgpn_major, bgpn_minor;
2772 uint8_t shutdown_comm_length;
2773 uint8_t remainder_offset;
2774
2775 ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
2776 if (length<BGP_NOTIFICATION_SIZE)
2777 return;
2778
2779 bgp_notification_header = (const struct bgp_notification *)dat;
2780 bgpn_major = EXTRACT_U_1(bgp_notification_header->bgpn_major);
2781 bgpn_minor = EXTRACT_U_1(bgp_notification_header->bgpn_minor);
2782
2783 ND_PRINT((ndo, ", %s (%u)",
2784 tok2str(bgp_notify_major_values, "Unknown Error",
2785 bgpn_major),
2786 bgpn_major));
2787
2788 switch (bgpn_major) {
2789
2790 case BGP_NOTIFY_MAJOR_MSG:
2791 ND_PRINT((ndo, ", subcode %s (%u)",
2792 tok2str(bgp_notify_minor_msg_values, "Unknown",
2793 bgpn_minor),
2794 bgpn_minor));
2795 break;
2796 case BGP_NOTIFY_MAJOR_OPEN:
2797 ND_PRINT((ndo, ", subcode %s (%u)",
2798 tok2str(bgp_notify_minor_open_values, "Unknown",
2799 bgpn_minor),
2800 bgpn_minor));
2801 break;
2802 case BGP_NOTIFY_MAJOR_UPDATE:
2803 ND_PRINT((ndo, ", subcode %s (%u)",
2804 tok2str(bgp_notify_minor_update_values, "Unknown",
2805 bgpn_minor),
2806 bgpn_minor));
2807 break;
2808 case BGP_NOTIFY_MAJOR_FSM:
2809 ND_PRINT((ndo, " subcode %s (%u)",
2810 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2811 bgpn_minor),
2812 bgpn_minor));
2813 break;
2814 case BGP_NOTIFY_MAJOR_CAP:
2815 ND_PRINT((ndo, " subcode %s (%u)",
2816 tok2str(bgp_notify_minor_cap_values, "Unknown",
2817 bgpn_minor),
2818 bgpn_minor));
2819 break;
2820 case BGP_NOTIFY_MAJOR_CEASE:
2821 ND_PRINT((ndo, ", subcode %s (%u)",
2822 tok2str(bgp_notify_minor_cease_values, "Unknown",
2823 bgpn_minor),
2824 bgpn_minor));
2825
2826 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2827 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2828 */
2829 if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2830 tptr = dat + BGP_NOTIFICATION_SIZE;
2831 ND_TCHECK_7(tptr);
2832 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2833 tok2str(af_values, "Unknown", EXTRACT_BE_U_2(tptr)),
2834 EXTRACT_BE_U_2(tptr),
2835 tok2str(bgp_safi_values, "Unknown", EXTRACT_U_1((tptr + 2))),
2836 EXTRACT_U_1((tptr + 2)),
2837 EXTRACT_BE_U_4(tptr + 3)));
2838 }
2839 /*
2840 * draft-ietf-idr-shutdown describes a method to send a communication
2841 * intended for human consumption regarding the Administrative Shutdown
2842 */
2843 if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
2844 bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
2845 length >= BGP_NOTIFICATION_SIZE + 1) {
2846 tptr = dat + BGP_NOTIFICATION_SIZE;
2847 ND_TCHECK_1(tptr);
2848 shutdown_comm_length = EXTRACT_U_1(tptr);
2849 remainder_offset = 0;
2850 /* garbage, hexdump it all */
2851 if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN ||
2852 shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) {
2853 ND_PRINT((ndo, ", invalid Shutdown Communication length"));
2854 }
2855 else if (shutdown_comm_length == 0) {
2856 ND_PRINT((ndo, ", empty Shutdown Communication"));
2857 remainder_offset += 1;
2858 }
2859 /* a proper shutdown communication */
2860 else {
2861 ND_TCHECK_LEN(tptr + 1, shutdown_comm_length);
2862 ND_PRINT((ndo, ", Shutdown Communication (length: %u): \"", shutdown_comm_length));
2863 (void)fn_printn(ndo, tptr+1, shutdown_comm_length, NULL);
2864 ND_PRINT((ndo, "\""));
2865 remainder_offset += shutdown_comm_length + 1;
2866 }
2867 /* if there is trailing data, hexdump it */
2868 if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) {
2869 ND_PRINT((ndo, ", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE)));
2870 hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2871 }
2872 }
2873 break;
2874 default:
2875 break;
2876 }
2877
2878 return;
2879 trunc:
2880 ND_PRINT((ndo, "[|BGP]"));
2881 }
2882
2883 static void
2884 bgp_route_refresh_print(netdissect_options *ndo,
2885 const u_char *pptr, int len)
2886 {
2887 const struct bgp_route_refresh *bgp_route_refresh_header;
2888
2889 ND_TCHECK_LEN(pptr, BGP_ROUTE_REFRESH_SIZE);
2890
2891 /* some little sanity checking */
2892 if (len<BGP_ROUTE_REFRESH_SIZE)
2893 return;
2894
2895 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2896
2897 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)",
2898 tok2str(af_values,"Unknown",
2899 EXTRACT_BE_U_2(bgp_route_refresh_header->afi)),
2900 EXTRACT_BE_U_2(bgp_route_refresh_header->afi),
2901 tok2str(bgp_safi_values,"Unknown",
2902 EXTRACT_U_1(bgp_route_refresh_header->safi)),
2903 EXTRACT_U_1(bgp_route_refresh_header->safi)));
2904
2905 if (ndo->ndo_vflag > 1) {
2906 ND_TCHECK_LEN(pptr, len);
2907 print_unknown_data(ndo, pptr, "\n\t ", len);
2908 }
2909
2910 return;
2911 trunc:
2912 ND_PRINT((ndo, "[|BGP]"));
2913 }
2914
2915 static int
2916 bgp_pdu_print(netdissect_options *ndo,
2917 const u_char *dat, u_int length)
2918 {
2919 const struct bgp *bgp_header;
2920 uint8_t bgp_type;
2921
2922 ND_TCHECK_LEN(dat, BGP_SIZE);
2923 bgp_header = (const struct bgp *)dat;
2924 bgp_type = EXTRACT_U_1(bgp_header->bgp_type);
2925
2926 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2927 tok2str(bgp_msg_values, "Unknown", bgp_type),
2928 bgp_type,
2929 length));
2930
2931 switch (bgp_type) {
2932 case BGP_OPEN:
2933 bgp_open_print(ndo, dat, length);
2934 break;
2935 case BGP_UPDATE:
2936 bgp_update_print(ndo, dat, length);
2937 break;
2938 case BGP_NOTIFICATION:
2939 bgp_notification_print(ndo, dat, length);
2940 break;
2941 case BGP_KEEPALIVE:
2942 break;
2943 case BGP_ROUTE_REFRESH:
2944 bgp_route_refresh_print(ndo, dat, length);
2945 break;
2946 default:
2947 /* we have no decoder for the BGP message */
2948 ND_TCHECK_LEN(dat, length);
2949 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp_type));
2950 print_unknown_data(ndo, dat, "\n\t ", length);
2951 break;
2952 }
2953 return 1;
2954 trunc:
2955 ND_PRINT((ndo, "[|BGP]"));
2956 return 0;
2957 }
2958
2959 void
2960 bgp_print(netdissect_options *ndo,
2961 const u_char *dat, int length)
2962 {
2963 const u_char *p;
2964 const u_char *ep;
2965 const u_char *start;
2966 const u_char marker[] = {
2967 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2968 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2969 };
2970 const struct bgp *bgp_header;
2971 uint16_t hlen;
2972
2973 ep = dat + length;
2974 if (ndo->ndo_snapend < dat + length)
2975 ep = ndo->ndo_snapend;
2976
2977 ND_PRINT((ndo, ": BGP"));
2978
2979 if (ndo->ndo_vflag < 1) /* lets be less chatty */
2980 return;
2981
2982 p = dat;
2983 start = p;
2984 while (p < ep) {
2985 if (!ND_TTEST_1(p))
2986 break;
2987 if (EXTRACT_U_1(p) != 0xff) {
2988 p++;
2989 continue;
2990 }
2991
2992 if (!ND_TTEST_LEN(p, sizeof(marker)))
2993 break;
2994 if (memcmp(p, marker, sizeof(marker)) != 0) {
2995 p++;
2996 continue;
2997 }
2998
2999 /* found BGP header */
3000 ND_TCHECK_LEN(p, BGP_SIZE);
3001 bgp_header = (const struct bgp *)p;
3002
3003 if (start != p)
3004 ND_PRINT((ndo, " [|BGP]"));
3005
3006 hlen = EXTRACT_BE_U_2(bgp_header->bgp_len);
3007 if (hlen < BGP_SIZE) {
3008 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
3009 BGP_SIZE));
3010 break;
3011 }
3012
3013 if (ND_TTEST_LEN(p, hlen)) {
3014 if (!bgp_pdu_print(ndo, p, hlen))
3015 return;
3016 p += hlen;
3017 start = p;
3018 } else {
3019 ND_PRINT((ndo, "\n[|BGP %s]",
3020 tok2str(bgp_msg_values,
3021 "Unknown Message Type",
3022 EXTRACT_U_1(bgp_header->bgp_type))));
3023 break;
3024 }
3025 }
3026
3027 return;
3028
3029 trunc:
3030 ND_PRINT((ndo, " [|BGP]"));
3031 }
3032
3033 /*
3034 * Local Variables:
3035 * c-style: whitesmith
3036 * c-basic-offset: 4
3037 * End:
3038 */
[mirror] the TCPdump network dissector