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Use more the EXTRACT_U_1() macro (52/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 uint8_t bgp_marker[16];
52 uint16_t bgp_len;
53 uint8_t bgp_type;
54 };
55 #define BGP_SIZE 19 /* unaligned */
56
57 #define BGP_OPEN 1
58 #define BGP_UPDATE 2
59 #define BGP_NOTIFICATION 3
60 #define BGP_KEEPALIVE 4
61 #define BGP_ROUTE_REFRESH 5
62
63 static const struct tok bgp_msg_values[] = {
64 { BGP_OPEN, "Open"},
65 { BGP_UPDATE, "Update"},
66 { BGP_NOTIFICATION, "Notification"},
67 { BGP_KEEPALIVE, "Keepalive"},
68 { BGP_ROUTE_REFRESH, "Route Refresh"},
69 { 0, NULL}
70 };
71
72 struct bgp_open {
73 uint8_t bgpo_marker[16];
74 uint16_t bgpo_len;
75 uint8_t bgpo_type;
76 uint8_t bgpo_version;
77 uint16_t bgpo_myas;
78 uint16_t bgpo_holdtime;
79 uint32_t bgpo_id;
80 uint8_t bgpo_optlen;
81 /* options should follow */
82 };
83 #define BGP_OPEN_SIZE 29 /* unaligned */
84
85 struct bgp_opt {
86 uint8_t bgpopt_type;
87 uint8_t bgpopt_len;
88 /* variable length */
89 };
90 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
91 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
92
93 struct bgp_notification {
94 uint8_t bgpn_marker[16];
95 uint16_t bgpn_len;
96 uint8_t bgpn_type;
97 uint8_t bgpn_major;
98 uint8_t bgpn_minor;
99 };
100 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
101
102 struct bgp_route_refresh {
103 uint8_t bgp_marker[16];
104 uint16_t len;
105 uint8_t type;
106 uint8_t afi[2]; /* the compiler messes this structure up */
107 uint8_t res; /* when doing misaligned sequences of int8 and int16 */
108 uint8_t safi; /* afi should be int16 - so we have to access it using */
109 }; /* EXTRACT_BE_U_2(&bgp_route_refresh->afi) (sigh) */
110 #define BGP_ROUTE_REFRESH_SIZE 23
111
112 #define bgp_attr_lenlen(flags, p) \
113 (((flags) & 0x10) ? 2 : 1)
114 #define bgp_attr_len(flags, p) \
115 (((flags) & 0x10) ? EXTRACT_BE_U_2(p) : *(p))
116
117 #define BGPTYPE_ORIGIN 1
118 #define BGPTYPE_AS_PATH 2
119 #define BGPTYPE_NEXT_HOP 3
120 #define BGPTYPE_MULTI_EXIT_DISC 4
121 #define BGPTYPE_LOCAL_PREF 5
122 #define BGPTYPE_ATOMIC_AGGREGATE 6
123 #define BGPTYPE_AGGREGATOR 7
124 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
125 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */
126 #define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */
127 #define BGPTYPE_DPA 11 /* deprecated, draft-ietf-idr-bgp-dpa */
128 #define BGPTYPE_ADVERTISERS 12 /* deprecated RFC1863 */
129 #define BGPTYPE_RCID_PATH 13 /* deprecated RFC1863 */
130 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */
131 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */
132 #define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */
133 #define BGPTYPE_AS4_PATH 17 /* RFC6793 */
134 #define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */
135 #define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */
136 #define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */
137 #define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */
138 #define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */
139 #define BGPTYPE_AIGP 26 /* RFC7311 */
140 #define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */
141 #define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */
142 #define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */
143 #define BGPTYPE_ATTR_SET 128 /* RFC6368 */
144
145 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
146
147 static const struct tok bgp_attr_values[] = {
148 { BGPTYPE_ORIGIN, "Origin"},
149 { BGPTYPE_AS_PATH, "AS Path"},
150 { BGPTYPE_AS4_PATH, "AS4 Path"},
151 { BGPTYPE_NEXT_HOP, "Next Hop"},
152 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
153 { BGPTYPE_LOCAL_PREF, "Local Preference"},
154 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
155 { BGPTYPE_AGGREGATOR, "Aggregator"},
156 { BGPTYPE_AGGREGATOR4, "Aggregator4"},
157 { BGPTYPE_COMMUNITIES, "Community"},
158 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
159 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
160 { BGPTYPE_DPA, "DPA"},
161 { BGPTYPE_ADVERTISERS, "Advertisers"},
162 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"},
163 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
164 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
165 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
166 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
167 { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"},
168 { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"},
169 { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
170 { BGPTYPE_AIGP, "Accumulated IGP Metric"},
171 { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
172 { BGPTYPE_ENTROPY_LABEL, "Entropy Label"},
173 { BGPTYPE_LARGE_COMMUNITY, "Large Community"},
174 { BGPTYPE_ATTR_SET, "Attribute Set"},
175 { 255, "Reserved for development"},
176 { 0, NULL}
177 };
178
179 #define BGP_AS_SET 1
180 #define BGP_AS_SEQUENCE 2
181 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
182 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
183
184 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
185 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
186
187 static const struct tok bgp_as_path_segment_open_values[] = {
188 { BGP_AS_SEQUENCE, ""},
189 { BGP_AS_SET, "{ "},
190 { BGP_CONFED_AS_SEQUENCE, "( "},
191 { BGP_CONFED_AS_SET, "({ "},
192 { 0, NULL}
193 };
194
195 static const struct tok bgp_as_path_segment_close_values[] = {
196 { BGP_AS_SEQUENCE, ""},
197 { BGP_AS_SET, "}"},
198 { BGP_CONFED_AS_SEQUENCE, ")"},
199 { BGP_CONFED_AS_SET, "})"},
200 { 0, NULL}
201 };
202
203 #define BGP_OPT_AUTH 1
204 #define BGP_OPT_CAP 2
205
206 static const struct tok bgp_opt_values[] = {
207 { BGP_OPT_AUTH, "Authentication Information"},
208 { BGP_OPT_CAP, "Capabilities Advertisement"},
209 { 0, NULL}
210 };
211
212 #define BGP_CAPCODE_MP 1 /* RFC2858 */
213 #define BGP_CAPCODE_RR 2 /* RFC2918 */
214 #define BGP_CAPCODE_ORF 3 /* RFC5291 */
215 #define BGP_CAPCODE_MR 4 /* RFC3107 */
216 #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */
217 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */
218 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
219 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
220 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
221 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
222 #define BGP_CAPCODE_ENH_RR 70 /* draft-keyur-bgp-enhanced-route-refresh */
223 #define BGP_CAPCODE_RR_CISCO 128
224
225 static const struct tok bgp_capcode_values[] = {
226 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
227 { BGP_CAPCODE_RR, "Route Refresh"},
228 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
229 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
230 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
231 { BGP_CAPCODE_RESTART, "Graceful Restart"},
232 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
233 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
234 { BGP_CAPCODE_MULTISESS, "Multisession BGP"},
235 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
236 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
237 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
238 { 0, NULL}
239 };
240
241 #define BGP_NOTIFY_MAJOR_MSG 1
242 #define BGP_NOTIFY_MAJOR_OPEN 2
243 #define BGP_NOTIFY_MAJOR_UPDATE 3
244 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
245 #define BGP_NOTIFY_MAJOR_FSM 5
246 #define BGP_NOTIFY_MAJOR_CEASE 6
247 #define BGP_NOTIFY_MAJOR_CAP 7
248
249 static const struct tok bgp_notify_major_values[] = {
250 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
251 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
252 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
253 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
254 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
255 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
256 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"},
257 { 0, NULL}
258 };
259
260 /* draft-ietf-idr-cease-subcode-02 */
261 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
262 /* draft-ietf-idr-shutdown-07 */
263 #define BGP_NOTIFY_MINOR_CEASE_SHUT 2
264 #define BGP_NOTIFY_MINOR_CEASE_RESET 4
265 #define BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN 128
266 static const struct tok bgp_notify_minor_cease_values[] = {
267 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
268 { BGP_NOTIFY_MINOR_CEASE_SHUT, "Administrative Shutdown"},
269 { 3, "Peer Unconfigured"},
270 { BGP_NOTIFY_MINOR_CEASE_RESET, "Administrative Reset"},
271 { 5, "Connection Rejected"},
272 { 6, "Other Configuration Change"},
273 { 7, "Connection Collision Resolution"},
274 { 0, NULL}
275 };
276
277 static const struct tok bgp_notify_minor_msg_values[] = {
278 { 1, "Connection Not Synchronized"},
279 { 2, "Bad Message Length"},
280 { 3, "Bad Message Type"},
281 { 0, NULL}
282 };
283
284 static const struct tok bgp_notify_minor_open_values[] = {
285 { 1, "Unsupported Version Number"},
286 { 2, "Bad Peer AS"},
287 { 3, "Bad BGP Identifier"},
288 { 4, "Unsupported Optional Parameter"},
289 { 5, "Authentication Failure"},
290 { 6, "Unacceptable Hold Time"},
291 { 7, "Capability Message Error"},
292 { 0, NULL}
293 };
294
295 static const struct tok bgp_notify_minor_update_values[] = {
296 { 1, "Malformed Attribute List"},
297 { 2, "Unrecognized Well-known Attribute"},
298 { 3, "Missing Well-known Attribute"},
299 { 4, "Attribute Flags Error"},
300 { 5, "Attribute Length Error"},
301 { 6, "Invalid ORIGIN Attribute"},
302 { 7, "AS Routing Loop"},
303 { 8, "Invalid NEXT_HOP Attribute"},
304 { 9, "Optional Attribute Error"},
305 { 10, "Invalid Network Field"},
306 { 11, "Malformed AS_PATH"},
307 { 0, NULL}
308 };
309
310 static const struct tok bgp_notify_minor_fsm_values[] = {
311 { 0, "Unspecified Error"},
312 { 1, "In OpenSent State"},
313 { 2, "In OpenConfirm State"},
314 { 3, "In Established State"},
315 { 0, NULL }
316 };
317
318 static const struct tok bgp_notify_minor_cap_values[] = {
319 { 1, "Invalid Action Value" },
320 { 2, "Invalid Capability Length" },
321 { 3, "Malformed Capability Value" },
322 { 4, "Unsupported Capability Code" },
323 { 0, NULL }
324 };
325
326 static const struct tok bgp_origin_values[] = {
327 { 0, "IGP"},
328 { 1, "EGP"},
329 { 2, "Incomplete"},
330 { 0, NULL}
331 };
332
333 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1
334 #define BGP_PMSI_TUNNEL_LDP_P2MP 2
335 #define BGP_PMSI_TUNNEL_PIM_SSM 3
336 #define BGP_PMSI_TUNNEL_PIM_SM 4
337 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5
338 #define BGP_PMSI_TUNNEL_INGRESS 6
339 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7
340
341 static const struct tok bgp_pmsi_tunnel_values[] = {
342 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
343 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
344 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
345 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
346 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
347 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
348 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
349 { 0, NULL}
350 };
351
352 static const struct tok bgp_pmsi_flag_values[] = {
353 { 0x01, "Leaf Information required"},
354 { 0, NULL}
355 };
356
357 #define BGP_AIGP_TLV 1
358
359 static const struct tok bgp_aigp_values[] = {
360 { BGP_AIGP_TLV, "AIGP"},
361 { 0, NULL}
362 };
363
364 /* Subsequent address family identifier, RFC2283 section 7 */
365 #define SAFNUM_RES 0
366 #define SAFNUM_UNICAST 1
367 #define SAFNUM_MULTICAST 2
368 #define SAFNUM_UNIMULTICAST 3 /* deprecated now */
369 /* labeled BGP RFC3107 */
370 #define SAFNUM_LABUNICAST 4
371 /* RFC6514 */
372 #define SAFNUM_MULTICAST_VPN 5
373 /* draft-nalawade-kapoor-tunnel-safi */
374 #define SAFNUM_TUNNEL 64
375 /* RFC4761 */
376 #define SAFNUM_VPLS 65
377 /* RFC6037 */
378 #define SAFNUM_MDT 66
379 /* RFC4364 */
380 #define SAFNUM_VPNUNICAST 128
381 /* RFC6513 */
382 #define SAFNUM_VPNMULTICAST 129
383 #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */
384 /* RFC4684 */
385 #define SAFNUM_RT_ROUTING_INFO 132
386
387 #define BGP_VPN_RD_LEN 8
388
389 static const struct tok bgp_safi_values[] = {
390 { SAFNUM_RES, "Reserved"},
391 { SAFNUM_UNICAST, "Unicast"},
392 { SAFNUM_MULTICAST, "Multicast"},
393 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
394 { SAFNUM_LABUNICAST, "labeled Unicast"},
395 { SAFNUM_TUNNEL, "Tunnel"},
396 { SAFNUM_VPLS, "VPLS"},
397 { SAFNUM_MDT, "MDT"},
398 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
399 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
400 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
401 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
402 { SAFNUM_MULTICAST_VPN, "Multicast VPN"},
403 { 0, NULL }
404 };
405
406 /* well-known community */
407 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
408 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
409 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
410
411 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */
412 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
413 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
414 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
415 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
416 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
417 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
418 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
419 /* rfc2547 bgp-mpls-vpns */
420 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
421 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatibility */
422 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatibility */
423 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatibility */
424
425 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
426 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatibility */
427
428 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
429 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatibility */
430
431 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
432
433 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
434 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
435 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
436 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */
437
438 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */
439 #define BGP_EXT_COM_EIGRP_GEN 0x8800
440 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801
441 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
442 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803
443 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804
444 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
445
446 static const struct tok bgp_extd_comm_flag_values[] = {
447 { 0x8000, "vendor-specific"},
448 { 0x4000, "non-transitive"},
449 { 0, NULL},
450 };
451
452 static const struct tok bgp_extd_comm_subtype_values[] = {
453 { BGP_EXT_COM_RT_0, "target"},
454 { BGP_EXT_COM_RT_1, "target"},
455 { BGP_EXT_COM_RT_2, "target"},
456 { BGP_EXT_COM_RO_0, "origin"},
457 { BGP_EXT_COM_RO_1, "origin"},
458 { BGP_EXT_COM_RO_2, "origin"},
459 { BGP_EXT_COM_LINKBAND, "link-BW"},
460 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
461 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
462 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
463 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
464 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
465 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
466 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
467 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
468 { BGP_EXT_COM_L2INFO, "layer2-info"},
469 { BGP_EXT_COM_EIGRP_GEN , "eigrp-general-route (flag, tag)" },
470 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY , "eigrp-route-metric (AS, delay)" },
471 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW , "eigrp-route-metric (reliability, nexthop, bandwidth)" },
472 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU , "eigrp-route-metric (load, MTU)" },
473 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID , "eigrp-external-route (remote-AS, remote-ID)" },
474 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC , "eigrp-external-route (remote-proto, remote-metric)" },
475 { BGP_EXT_COM_SOURCE_AS, "source-AS" },
476 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
477 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
478 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
479 { 0, NULL},
480 };
481
482 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
483 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
484 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
485 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
486 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
487 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
488 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
489 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
490
491 static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
492 { BGP_OSPF_RTYPE_RTR, "Router" },
493 { BGP_OSPF_RTYPE_NET, "Network" },
494 { BGP_OSPF_RTYPE_SUM, "Summary" },
495 { BGP_OSPF_RTYPE_EXT, "External" },
496 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
497 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
498 { 0, NULL },
499 };
500
501 /* ADD-PATH Send/Receive field values */
502 static const struct tok bgp_add_path_recvsend[] = {
503 { 1, "Receive" },
504 { 2, "Send" },
505 { 3, "Both" },
506 { 0, NULL },
507 };
508
509 static char astostr[20];
510
511 /*
512 * as_printf
513 *
514 * Convert an AS number into a string and return string pointer.
515 *
516 * Depending on bflag is set or not, AS number is converted into ASDOT notation
517 * or plain number notation.
518 *
519 */
520 static char *
521 as_printf(netdissect_options *ndo,
522 char *str, int size, u_int asnum)
523 {
524 if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
525 snprintf(str, size, "%u", asnum);
526 } else {
527 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
528 }
529 return str;
530 }
531
532 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
533
534 int
535 decode_prefix4(netdissect_options *ndo,
536 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
537 {
538 struct in_addr addr;
539 u_int plen, plenbytes;
540
541 ND_TCHECK_1(pptr);
542 ITEMCHECK(1);
543 plen = EXTRACT_U_1(pptr);
544 if (32 < plen)
545 return -1;
546 itemlen -= 1;
547
548 memset(&addr, 0, sizeof(addr));
549 plenbytes = (plen + 7) / 8;
550 ND_TCHECK2(pptr[1], plenbytes);
551 ITEMCHECK(plenbytes);
552 memcpy(&addr, pptr + 1, plenbytes);
553 if (plen % 8) {
554 ((u_char *)&addr)[plenbytes - 1] &=
555 ((0xff00 >> (plen % 8)) & 0xff);
556 }
557 snprintf(buf, buflen, "%s/%d", ipaddr_string(ndo, &addr), plen);
558 return 1 + plenbytes;
559
560 trunc:
561 return -2;
562
563 badtlv:
564 return -3;
565 }
566
567 static int
568 decode_labeled_prefix4(netdissect_options *ndo,
569 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
570 {
571 struct in_addr addr;
572 u_int plen, plenbytes;
573
574 /* prefix length and label = 4 bytes */
575 ND_TCHECK_4(pptr);
576 ITEMCHECK(4);
577 plen = EXTRACT_U_1(pptr); /* get prefix length */
578
579 /* this is one of the weirdnesses of rfc3107
580 the label length (actually the label + COS bits)
581 is added to the prefix length;
582 we also do only read out just one label -
583 there is no real application for advertisement of
584 stacked labels in a single BGP message
585 */
586
587 if (24 > plen)
588 return -1;
589
590 plen-=24; /* adjust prefixlen - labellength */
591
592 if (32 < plen)
593 return -1;
594 itemlen -= 4;
595
596 memset(&addr, 0, sizeof(addr));
597 plenbytes = (plen + 7) / 8;
598 ND_TCHECK2(pptr[4], plenbytes);
599 ITEMCHECK(plenbytes);
600 memcpy(&addr, pptr + 4, plenbytes);
601 if (plen % 8) {
602 ((u_char *)&addr)[plenbytes - 1] &=
603 ((0xff00 >> (plen % 8)) & 0xff);
604 }
605 /* the label may get offsetted by 4 bits so lets shift it right */
606 snprintf(buf, buflen, "%s/%d, label:%u %s",
607 ipaddr_string(ndo, &addr),
608 plen,
609 EXTRACT_BE_U_3(pptr + 1)>>4,
610 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
611
612 return 4 + plenbytes;
613
614 trunc:
615 return -2;
616
617 badtlv:
618 return -3;
619 }
620
621 /*
622 * bgp_vpn_ip_print
623 *
624 * print an ipv4 or ipv6 address into a buffer dependend on address length.
625 */
626 static char *
627 bgp_vpn_ip_print(netdissect_options *ndo,
628 const u_char *pptr, u_int addr_length)
629 {
630
631 /* worst case string is s fully formatted v6 address */
632 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
633 char *pos = addr;
634
635 switch(addr_length) {
636 case (sizeof(struct in_addr) << 3): /* 32 */
637 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
638 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
639 break;
640 case (sizeof(struct in6_addr) << 3): /* 128 */
641 ND_TCHECK2(pptr[0], sizeof(struct in6_addr));
642 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
643 break;
644 default:
645 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
646 break;
647 }
648 pos += strlen(pos);
649
650 trunc:
651 *(pos) = '\0';
652 return (addr);
653 }
654
655 /*
656 * bgp_vpn_sg_print
657 *
658 * print an multicast s,g entry into a buffer.
659 * the s,g entry is encoded like this.
660 *
661 * +-----------------------------------+
662 * | Multicast Source Length (1 octet) |
663 * +-----------------------------------+
664 * | Multicast Source (Variable) |
665 * +-----------------------------------+
666 * | Multicast Group Length (1 octet) |
667 * +-----------------------------------+
668 * | Multicast Group (Variable) |
669 * +-----------------------------------+
670 *
671 * return the number of bytes read from the wire.
672 */
673 static int
674 bgp_vpn_sg_print(netdissect_options *ndo,
675 const u_char *pptr, char *buf, u_int buflen)
676 {
677 uint8_t addr_length;
678 u_int total_length, offset;
679
680 total_length = 0;
681
682 /* Source address length, encoded in bits */
683 ND_TCHECK_1(pptr);
684 addr_length = EXTRACT_U_1(pptr);
685 pptr++;
686
687 /* Source address */
688 ND_TCHECK2(pptr[0], (addr_length >> 3));
689 total_length += (addr_length >> 3) + 1;
690 offset = strlen(buf);
691 if (addr_length) {
692 snprintf(buf + offset, buflen - offset, ", Source %s",
693 bgp_vpn_ip_print(ndo, pptr, addr_length));
694 pptr += (addr_length >> 3);
695 }
696
697 /* Group address length, encoded in bits */
698 ND_TCHECK_1(pptr);
699 addr_length = EXTRACT_U_1(pptr);
700 pptr++;
701
702 /* Group address */
703 ND_TCHECK2(pptr[0], (addr_length >> 3));
704 total_length += (addr_length >> 3) + 1;
705 offset = strlen(buf);
706 if (addr_length) {
707 snprintf(buf + offset, buflen - offset, ", Group %s",
708 bgp_vpn_ip_print(ndo, pptr, addr_length));
709 pptr += (addr_length >> 3);
710 }
711
712 trunc:
713 return (total_length);
714 }
715
716 /* RDs and RTs share the same semantics
717 * we use bgp_vpn_rd_print for
718 * printing route targets inside a NLRI */
719 char *
720 bgp_vpn_rd_print(netdissect_options *ndo,
721 const u_char *pptr)
722 {
723 /* allocate space for the largest possible string */
724 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
725 char *pos = rd;
726
727 /* ok lets load the RD format */
728 switch (EXTRACT_BE_U_2(pptr)) {
729
730 /* 2-byte-AS:number fmt*/
731 case 0:
732 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
733 EXTRACT_BE_U_2(pptr + 2),
734 EXTRACT_BE_U_4(pptr + 4),
735 EXTRACT_U_1(pptr + 4), EXTRACT_U_1(pptr + 5),
736 EXTRACT_U_1(pptr + 6), EXTRACT_U_1(pptr + 7));
737 break;
738 /* IP-address:AS fmt*/
739
740 case 1:
741 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
742 EXTRACT_U_1(pptr + 2), EXTRACT_U_1(pptr + 3),
743 EXTRACT_U_1(pptr + 4), EXTRACT_U_1(pptr + 5),
744 EXTRACT_BE_U_2(pptr + 6));
745 break;
746
747 /* 4-byte-AS:number fmt*/
748 case 2:
749 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
750 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(pptr + 2)),
751 EXTRACT_BE_U_2(pptr + 6), EXTRACT_U_1(pptr + 2),
752 EXTRACT_U_1(pptr + 3), EXTRACT_U_1(pptr + 4),
753 EXTRACT_U_1(pptr + 5), EXTRACT_BE_U_2(pptr + 6));
754 break;
755 default:
756 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
757 break;
758 }
759 pos += strlen(pos);
760 *(pos) = '\0';
761 return (rd);
762 }
763
764 static int
765 decode_rt_routing_info(netdissect_options *ndo,
766 const u_char *pptr, char *buf, u_int buflen)
767 {
768 uint8_t route_target[8];
769 u_int plen;
770 char asbuf[sizeof(astostr)]; /* bgp_vpn_rd_print() overwrites astostr */
771
772 /* NLRI "prefix length" from RFC 2858 Section 4. */
773 ND_TCHECK_1(pptr);
774 plen = EXTRACT_U_1(pptr); /* get prefix length */
775
776 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
777 * RFC 4684 Section 4 defines the layout of "origin AS" and "route
778 * target" fields inside the "prefix" depending on its length.
779 */
780 if (0 == plen) {
781 /* Without "origin AS", without "route target". */
782 snprintf(buf, buflen, "default route target");
783 return 1;
784 }
785
786 if (32 > plen)
787 return -1;
788
789 /* With at least "origin AS", possibly with "route target". */
790 ND_TCHECK_4(pptr + 1);
791 as_printf(ndo, asbuf, sizeof(asbuf), EXTRACT_BE_U_4(pptr + 1));
792
793 plen-=32; /* adjust prefix length */
794
795 if (64 < plen)
796 return -1;
797
798 /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 }
799 * and gives the number of octets in the variable-length "route
800 * target" field inside this NLRI "prefix". Look for it.
801 */
802 memset(&route_target, 0, sizeof(route_target));
803 ND_TCHECK2(pptr[5], (plen + 7) / 8);
804 memcpy(&route_target, pptr + 5, (plen + 7) / 8);
805 /* Which specification says to do this? */
806 if (plen % 8) {
807 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
808 ((0xff00 >> (plen % 8)) & 0xff);
809 }
810 snprintf(buf, buflen, "origin AS: %s, route target %s",
811 asbuf,
812 bgp_vpn_rd_print(ndo, (u_char *)&route_target));
813
814 return 5 + (plen + 7) / 8;
815
816 trunc:
817 return -2;
818 }
819
820 static int
821 decode_labeled_vpn_prefix4(netdissect_options *ndo,
822 const u_char *pptr, char *buf, u_int buflen)
823 {
824 struct in_addr addr;
825 u_int plen;
826
827 ND_TCHECK_1(pptr);
828 plen = EXTRACT_U_1(pptr); /* get prefix length */
829
830 if ((24+64) > plen)
831 return -1;
832
833 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
834
835 if (32 < plen)
836 return -1;
837
838 memset(&addr, 0, sizeof(addr));
839 ND_TCHECK2(pptr[12], (plen + 7) / 8);
840 memcpy(&addr, pptr + 12, (plen + 7) / 8);
841 if (plen % 8) {
842 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
843 ((0xff00 >> (plen % 8)) & 0xff);
844 }
845 /* the label may get offsetted by 4 bits so lets shift it right */
846 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
847 bgp_vpn_rd_print(ndo, pptr+4),
848 ipaddr_string(ndo, &addr),
849 plen,
850 EXTRACT_BE_U_3(pptr + 1)>>4,
851 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
852
853 return 12 + (plen + 7) / 8;
854
855 trunc:
856 return -2;
857 }
858
859 /*
860 * +-------------------------------+
861 * | |
862 * | RD:IPv4-address (12 octets) |
863 * | |
864 * +-------------------------------+
865 * | MDT Group-address (4 octets) |
866 * +-------------------------------+
867 */
868
869 #define MDT_VPN_NLRI_LEN 16
870
871 static int
872 decode_mdt_vpn_nlri(netdissect_options *ndo,
873 const u_char *pptr, char *buf, u_int buflen)
874 {
875
876 const u_char *rd;
877 const u_char *vpn_ip;
878
879 ND_TCHECK_1(pptr);
880
881 /* if the NLRI is not predefined length, quit.*/
882 if (EXTRACT_U_1(pptr) != MDT_VPN_NLRI_LEN * 8)
883 return -1;
884 pptr++;
885
886 /* RD */
887 ND_TCHECK_8(pptr);
888 rd = pptr;
889 pptr+=8;
890
891 /* IPv4 address */
892 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
893 vpn_ip = pptr;
894 pptr+=sizeof(struct in_addr);
895
896 /* MDT Group Address */
897 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
898
899 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
900 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
901
902 return MDT_VPN_NLRI_LEN + 1;
903
904 trunc:
905
906 return -2;
907 }
908
909 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
910 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
911 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
912 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
913 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
914 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
915 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
916
917 static const struct tok bgp_multicast_vpn_route_type_values[] = {
918 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
919 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
920 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
921 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
922 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
923 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
924 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
925 { 0, NULL}
926 };
927
928 static int
929 decode_multicast_vpn(netdissect_options *ndo,
930 const u_char *pptr, char *buf, u_int buflen)
931 {
932 uint8_t route_type, route_length, addr_length, sg_length;
933 u_int offset;
934
935 ND_TCHECK_2(pptr);
936 route_type = EXTRACT_U_1(pptr);
937 pptr++;
938 route_length = EXTRACT_U_1(pptr);
939 pptr++;
940
941 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
942 tok2str(bgp_multicast_vpn_route_type_values,
943 "Unknown", route_type),
944 route_type, route_length);
945
946 switch(route_type) {
947 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
948 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
949 offset = strlen(buf);
950 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
951 bgp_vpn_rd_print(ndo, pptr),
952 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
953 (route_length - BGP_VPN_RD_LEN) << 3));
954 break;
955 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
956 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4);
957 offset = strlen(buf);
958 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
959 bgp_vpn_rd_print(ndo, pptr),
960 as_printf(ndo, astostr, sizeof(astostr),
961 EXTRACT_BE_U_4(pptr + BGP_VPN_RD_LEN)));
962 break;
963
964 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
965 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
966 offset = strlen(buf);
967 snprintf(buf + offset, buflen - offset, ", RD: %s",
968 bgp_vpn_rd_print(ndo, pptr));
969 pptr += BGP_VPN_RD_LEN;
970
971 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
972 addr_length = route_length - sg_length;
973
974 ND_TCHECK2(pptr[0], addr_length);
975 offset = strlen(buf);
976 snprintf(buf + offset, buflen - offset, ", Originator %s",
977 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
978 break;
979
980 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
981 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
982 offset = strlen(buf);
983 snprintf(buf + offset, buflen - offset, ", RD: %s",
984 bgp_vpn_rd_print(ndo, pptr));
985 pptr += BGP_VPN_RD_LEN;
986
987 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
988 break;
989
990 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
991 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
992 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4);
993 offset = strlen(buf);
994 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
995 bgp_vpn_rd_print(ndo, pptr),
996 as_printf(ndo, astostr, sizeof(astostr),
997 EXTRACT_BE_U_4(pptr + BGP_VPN_RD_LEN)));
998 pptr += BGP_VPN_RD_LEN + 4;
999
1000 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
1001 break;
1002
1003 /*
1004 * no per route-type printing yet.
1005 */
1006 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
1007 default:
1008 break;
1009 }
1010
1011 return route_length + 2;
1012
1013 trunc:
1014 return -2;
1015 }
1016
1017 /*
1018 * As I remember, some versions of systems have an snprintf() that
1019 * returns -1 if the buffer would have overflowed. If the return
1020 * value is negative, set buflen to 0, to indicate that we've filled
1021 * the buffer up.
1022 *
1023 * If the return value is greater than buflen, that means that
1024 * the buffer would have overflowed; again, set buflen to 0 in
1025 * that case.
1026 */
1027 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1028 if (stringlen<0) \
1029 buflen=0; \
1030 else if ((u_int)stringlen>buflen) \
1031 buflen=0; \
1032 else { \
1033 buflen-=stringlen; \
1034 buf+=stringlen; \
1035 }
1036
1037 static int
1038 decode_labeled_vpn_l2(netdissect_options *ndo,
1039 const u_char *pptr, char *buf, u_int buflen)
1040 {
1041 int plen,tlen,stringlen,tlv_type,tlv_len,ttlv_len;
1042
1043 ND_TCHECK_2(pptr);
1044 plen=EXTRACT_BE_U_2(pptr);
1045 tlen=plen;
1046 pptr+=2;
1047 /* Old and new L2VPN NLRI share AFI/SAFI
1048 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1049 * and > 17 as old format. Complain for the middle case
1050 */
1051 if (plen==12) {
1052 /* assume AD-only with RD, BGPNH */
1053 ND_TCHECK2(pptr[0],12);
1054 buf[0]='\0';
1055 stringlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1056 bgp_vpn_rd_print(ndo, pptr),
1057 ipaddr_string(ndo, pptr+8)
1058 );
1059 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1060 pptr+=12;
1061 tlen-=12;
1062 return plen;
1063 } else if (plen>17) {
1064 /* assume old format */
1065 /* RD, ID, LBLKOFF, LBLBASE */
1066
1067 ND_TCHECK2(pptr[0],15);
1068 buf[0]='\0';
1069 stringlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1070 bgp_vpn_rd_print(ndo, pptr),
1071 EXTRACT_BE_U_2(pptr + 8),
1072 EXTRACT_BE_U_2(pptr + 10),
1073 EXTRACT_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1074 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1075 pptr+=15;
1076 tlen-=15;
1077
1078 /* ok now the variable part - lets read out TLVs*/
1079 while (tlen>0) {
1080 if (tlen < 3)
1081 return -1;
1082 ND_TCHECK_3(pptr);
1083 tlv_type=EXTRACT_U_1(pptr);
1084 pptr++;
1085 tlv_len=EXTRACT_BE_U_2(pptr);
1086 ttlv_len=tlv_len;
1087 pptr+=2;
1088
1089 switch(tlv_type) {
1090 case 1:
1091 if (buflen!=0) {
1092 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1093 tlv_type,
1094 tlv_len);
1095 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1096 }
1097 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
1098 while (ttlv_len>0) {
1099 ND_TCHECK_1(pptr);
1100 if (buflen!=0) {
1101 stringlen=snprintf(buf,buflen, "%02x",
1102 EXTRACT_U_1(pptr));
1103 pptr++;
1104 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1105 }
1106 ttlv_len--;
1107 }
1108 break;
1109 default:
1110 if (buflen!=0) {
1111 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1112 tlv_type,
1113 tlv_len);
1114 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1115 }
1116 break;
1117 }
1118 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
1119 }
1120 return plen+2;
1121
1122 } else {
1123 /* complain bitterly ? */
1124 /* fall through */
1125 goto trunc;
1126 }
1127
1128 trunc:
1129 return -2;
1130 }
1131
1132 int
1133 decode_prefix6(netdissect_options *ndo,
1134 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1135 {
1136 struct in6_addr addr;
1137 u_int plen, plenbytes;
1138
1139 ND_TCHECK_1(pd);
1140 ITEMCHECK(1);
1141 plen = EXTRACT_U_1(pd);
1142 if (128 < plen)
1143 return -1;
1144 itemlen -= 1;
1145
1146 memset(&addr, 0, sizeof(addr));
1147 plenbytes = (plen + 7) / 8;
1148 ND_TCHECK2(pd[1], plenbytes);
1149 ITEMCHECK(plenbytes);
1150 memcpy(&addr, pd + 1, plenbytes);
1151 if (plen % 8) {
1152 addr.s6_addr[plenbytes - 1] &=
1153 ((0xff00 >> (plen % 8)) & 0xff);
1154 }
1155 snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen);
1156 return 1 + plenbytes;
1157
1158 trunc:
1159 return -2;
1160
1161 badtlv:
1162 return -3;
1163 }
1164
1165 static int
1166 decode_labeled_prefix6(netdissect_options *ndo,
1167 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1168 {
1169 struct in6_addr addr;
1170 u_int plen, plenbytes;
1171
1172 /* prefix length and label = 4 bytes */
1173 ND_TCHECK_4(pptr);
1174 ITEMCHECK(4);
1175 plen = EXTRACT_U_1(pptr); /* get prefix length */
1176
1177 if (24 > plen)
1178 return -1;
1179
1180 plen-=24; /* adjust prefixlen - labellength */
1181
1182 if (128 < plen)
1183 return -1;
1184 itemlen -= 4;
1185
1186 memset(&addr, 0, sizeof(addr));
1187 plenbytes = (plen + 7) / 8;
1188 ND_TCHECK2(pptr[4], plenbytes);
1189 memcpy(&addr, pptr + 4, plenbytes);
1190 if (plen % 8) {
1191 addr.s6_addr[plenbytes - 1] &=
1192 ((0xff00 >> (plen % 8)) & 0xff);
1193 }
1194 /* the label may get offsetted by 4 bits so lets shift it right */
1195 snprintf(buf, buflen, "%s/%d, label:%u %s",
1196 ip6addr_string(ndo, &addr),
1197 plen,
1198 EXTRACT_BE_U_3(pptr + 1)>>4,
1199 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1200
1201 return 4 + plenbytes;
1202
1203 trunc:
1204 return -2;
1205
1206 badtlv:
1207 return -3;
1208 }
1209
1210 static int
1211 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1212 const u_char *pptr, char *buf, u_int buflen)
1213 {
1214 struct in6_addr addr;
1215 u_int plen;
1216
1217 ND_TCHECK_1(pptr);
1218 plen = EXTRACT_U_1(pptr); /* get prefix length */
1219
1220 if ((24+64) > plen)
1221 return -1;
1222
1223 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1224
1225 if (128 < plen)
1226 return -1;
1227
1228 memset(&addr, 0, sizeof(addr));
1229 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1230 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1231 if (plen % 8) {
1232 addr.s6_addr[(plen + 7) / 8 - 1] &=
1233 ((0xff00 >> (plen % 8)) & 0xff);
1234 }
1235 /* the label may get offsetted by 4 bits so lets shift it right */
1236 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1237 bgp_vpn_rd_print(ndo, pptr+4),
1238 ip6addr_string(ndo, &addr),
1239 plen,
1240 EXTRACT_BE_U_3(pptr + 1)>>4,
1241 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1242
1243 return 12 + (plen + 7) / 8;
1244
1245 trunc:
1246 return -2;
1247 }
1248
1249 static int
1250 decode_clnp_prefix(netdissect_options *ndo,
1251 const u_char *pptr, char *buf, u_int buflen)
1252 {
1253 uint8_t addr[19];
1254 u_int plen;
1255
1256 ND_TCHECK_1(pptr);
1257 plen = EXTRACT_U_1(pptr); /* get prefix length */
1258
1259 if (152 < plen)
1260 return -1;
1261
1262 memset(&addr, 0, sizeof(addr));
1263 ND_TCHECK2(pptr[4], (plen + 7) / 8);
1264 memcpy(&addr, pptr + 4, (plen + 7) / 8);
1265 if (plen % 8) {
1266 addr[(plen + 7) / 8 - 1] &=
1267 ((0xff00 >> (plen % 8)) & 0xff);
1268 }
1269 snprintf(buf, buflen, "%s/%d",
1270 isonsap_string(ndo, addr,(plen + 7) / 8),
1271 plen);
1272
1273 return 1 + (plen + 7) / 8;
1274
1275 trunc:
1276 return -2;
1277 }
1278
1279 static int
1280 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1281 const u_char *pptr, char *buf, u_int buflen)
1282 {
1283 uint8_t addr[19];
1284 u_int plen;
1285
1286 ND_TCHECK_1(pptr);
1287 plen = EXTRACT_U_1(pptr); /* get prefix length */
1288
1289 if ((24+64) > plen)
1290 return -1;
1291
1292 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1293
1294 if (152 < plen)
1295 return -1;
1296
1297 memset(&addr, 0, sizeof(addr));
1298 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1299 memcpy(&addr, pptr + 12, (plen + 7) / 8);
1300 if (plen % 8) {
1301 addr[(plen + 7) / 8 - 1] &=
1302 ((0xff00 >> (plen % 8)) & 0xff);
1303 }
1304 /* the label may get offsetted by 4 bits so lets shift it right */
1305 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1306 bgp_vpn_rd_print(ndo, pptr+4),
1307 isonsap_string(ndo, addr,(plen + 7) / 8),
1308 plen,
1309 EXTRACT_BE_U_3(pptr + 1)>>4,
1310 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1311
1312 return 12 + (plen + 7) / 8;
1313
1314 trunc:
1315 return -2;
1316 }
1317
1318 /*
1319 * bgp_attr_get_as_size
1320 *
1321 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1322 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1323 * support, exchange AS-Path with the same path-attribute type value 0x02.
1324 */
1325 static int
1326 bgp_attr_get_as_size(netdissect_options *ndo,
1327 uint8_t bgpa_type, const u_char *pptr, int len)
1328 {
1329 const u_char *tptr = pptr;
1330
1331 /*
1332 * If the path attribute is the optional AS4 path type, then we already
1333 * know, that ASs must be encoded in 4 byte format.
1334 */
1335 if (bgpa_type == BGPTYPE_AS4_PATH) {
1336 return 4;
1337 }
1338
1339 /*
1340 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1341 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1342 * each.
1343 */
1344 while (tptr < pptr + len) {
1345 ND_TCHECK_1(tptr);
1346
1347 /*
1348 * If we do not find a valid segment type, our guess might be wrong.
1349 */
1350 if (EXTRACT_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || EXTRACT_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
1351 goto trunc;
1352 }
1353 ND_TCHECK_1(tptr + 1);
1354 tptr += 2 + tptr[1] * 2;
1355 }
1356
1357 /*
1358 * If we correctly reached end of the AS path attribute data content,
1359 * then most likely ASs were indeed encoded as 2 bytes.
1360 */
1361 if (tptr == pptr + len) {
1362 return 2;
1363 }
1364
1365 trunc:
1366
1367 /*
1368 * We can come here, either we did not have enough data, or if we
1369 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1370 * so that calller can try to decode each AS as of 4 bytes. If indeed
1371 * there was not enough data, it will crib and end the parse anyways.
1372 */
1373 return 4;
1374 }
1375
1376 static int
1377 bgp_attr_print(netdissect_options *ndo,
1378 u_int atype, const u_char *pptr, u_int len)
1379 {
1380 int i;
1381 uint16_t af;
1382 uint8_t safi, snpa, nhlen;
1383 union { /* copy buffer for bandwidth values */
1384 float f;
1385 uint32_t i;
1386 } bw;
1387 int advance;
1388 u_int tlen;
1389 const u_char *tptr;
1390 char buf[MAXHOSTNAMELEN + 100];
1391 int as_size;
1392
1393 tptr = pptr;
1394 tlen=len;
1395
1396 switch (atype) {
1397 case BGPTYPE_ORIGIN:
1398 if (len != 1)
1399 ND_PRINT((ndo, "invalid len"));
1400 else {
1401 ND_TCHECK_1(tptr);
1402 ND_PRINT((ndo, "%s", tok2str(bgp_origin_values,
1403 "Unknown Origin Typecode",
1404 EXTRACT_U_1(tptr))));
1405 }
1406 break;
1407
1408 /*
1409 * Process AS4 byte path and AS2 byte path attributes here.
1410 */
1411 case BGPTYPE_AS4_PATH:
1412 case BGPTYPE_AS_PATH:
1413 if (len % 2) {
1414 ND_PRINT((ndo, "invalid len"));
1415 break;
1416 }
1417 if (!len) {
1418 ND_PRINT((ndo, "empty"));
1419 break;
1420 }
1421
1422 /*
1423 * BGP updates exchanged between New speakers that support 4
1424 * byte AS, ASs are always encoded in 4 bytes. There is no
1425 * definitive way to find this, just by the packet's
1426 * contents. So, check for packet's TLV's sanity assuming
1427 * 2 bytes first, and it does not pass, assume that ASs are
1428 * encoded in 4 bytes format and move on.
1429 */
1430 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1431
1432 while (tptr < pptr + len) {
1433 ND_TCHECK_1(tptr);
1434 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values,
1435 "?", EXTRACT_U_1(tptr))));
1436 ND_TCHECK_1(tptr + 1);
1437 for (i = 0; i < tptr[1] * as_size; i += as_size) {
1438 ND_TCHECK2(tptr[2 + i], as_size);
1439 ND_PRINT((ndo, "%s ",
1440 as_printf(ndo, astostr, sizeof(astostr),
1441 as_size == 2 ?
1442 EXTRACT_BE_U_2(tptr + i + 2) :
1443 EXTRACT_BE_U_4(tptr + i + 2))));
1444 }
1445 ND_TCHECK_1(tptr);
1446 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values,
1447 "?", EXTRACT_U_1(tptr))));
1448 ND_TCHECK_1(tptr + 1);
1449 tptr += 2 + tptr[1] * as_size;
1450 }
1451 break;
1452 case BGPTYPE_NEXT_HOP:
1453 if (len != 4)
1454 ND_PRINT((ndo, "invalid len"));
1455 else {
1456 ND_TCHECK_4(tptr);
1457 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1458 }
1459 break;
1460 case BGPTYPE_MULTI_EXIT_DISC:
1461 case BGPTYPE_LOCAL_PREF:
1462 if (len != 4)
1463 ND_PRINT((ndo, "invalid len"));
1464 else {
1465 ND_TCHECK_4(tptr);
1466 ND_PRINT((ndo, "%u", EXTRACT_BE_U_4(tptr)));
1467 }
1468 break;
1469 case BGPTYPE_ATOMIC_AGGREGATE:
1470 if (len != 0)
1471 ND_PRINT((ndo, "invalid len"));
1472 break;
1473 case BGPTYPE_AGGREGATOR:
1474
1475 /*
1476 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1477 * the length of this PA can be either 6 bytes or 8 bytes.
1478 */
1479 if (len != 6 && len != 8) {
1480 ND_PRINT((ndo, "invalid len"));
1481 break;
1482 }
1483 ND_TCHECK2(tptr[0], len);
1484 if (len == 6) {
1485 ND_PRINT((ndo, " AS #%s, origin %s",
1486 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(tptr)),
1487 ipaddr_string(ndo, tptr + 2)));
1488 } else {
1489 ND_PRINT((ndo, " AS #%s, origin %s",
1490 as_printf(ndo, astostr, sizeof(astostr),
1491 EXTRACT_BE_U_4(tptr)), ipaddr_string(ndo, tptr + 4)));
1492 }
1493 break;
1494 case BGPTYPE_AGGREGATOR4:
1495 if (len != 8) {
1496 ND_PRINT((ndo, "invalid len"));
1497 break;
1498 }
1499 ND_TCHECK_8(tptr);
1500 ND_PRINT((ndo, " AS #%s, origin %s",
1501 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr)),
1502 ipaddr_string(ndo, tptr + 4)));
1503 break;
1504 case BGPTYPE_COMMUNITIES:
1505 if (len % 4) {
1506 ND_PRINT((ndo, "invalid len"));
1507 break;
1508 }
1509 while (tlen>0) {
1510 uint32_t comm;
1511 ND_TCHECK_4(tptr);
1512 comm = EXTRACT_BE_U_4(tptr);
1513 switch (comm) {
1514 case BGP_COMMUNITY_NO_EXPORT:
1515 ND_PRINT((ndo, " NO_EXPORT"));
1516 break;
1517 case BGP_COMMUNITY_NO_ADVERT:
1518 ND_PRINT((ndo, " NO_ADVERTISE"));
1519 break;
1520 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1521 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1522 break;
1523 default:
1524 ND_PRINT((ndo, "%u:%u%s",
1525 (comm >> 16) & 0xffff,
1526 comm & 0xffff,
1527 (tlen>4) ? ", " : ""));
1528 break;
1529 }
1530 tlen -=4;
1531 tptr +=4;
1532 }
1533 break;
1534 case BGPTYPE_ORIGINATOR_ID:
1535 if (len != 4) {
1536 ND_PRINT((ndo, "invalid len"));
1537 break;
1538 }
1539 ND_TCHECK_4(tptr);
1540 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1541 break;
1542 case BGPTYPE_CLUSTER_LIST:
1543 if (len % 4) {
1544 ND_PRINT((ndo, "invalid len"));
1545 break;
1546 }
1547 while (tlen>0) {
1548 ND_TCHECK_4(tptr);
1549 ND_PRINT((ndo, "%s%s",
1550 ipaddr_string(ndo, tptr),
1551 (tlen>4) ? ", " : ""));
1552 tlen -=4;
1553 tptr +=4;
1554 }
1555 break;
1556 case BGPTYPE_MP_REACH_NLRI:
1557 ND_TCHECK_3(tptr);
1558 af = EXTRACT_BE_U_2(tptr);
1559 safi = EXTRACT_U_1(tptr + 2);
1560
1561 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1562 tok2str(af_values, "Unknown AFI", af),
1563 af,
1564 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1565 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1566 safi));
1567
1568 switch(af<<8 | safi) {
1569 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1570 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1571 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1572 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1573 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1574 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1575 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1576 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1577 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1578 case (AFNUM_INET<<8 | SAFNUM_MDT):
1579 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1580 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1581 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1582 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1583 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1584 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1585 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1586 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1587 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1588 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1589 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1590 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1591 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1592 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1593 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1594 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1595 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1596 break;
1597 default:
1598 ND_TCHECK2(tptr[0], tlen);
1599 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1600 if (ndo->ndo_vflag <= 1)
1601 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1602 goto done;
1603 break;
1604 }
1605
1606 tptr +=3;
1607
1608 ND_TCHECK_1(tptr);
1609 nhlen = EXTRACT_U_1(tptr);
1610 tlen = nhlen;
1611 tptr++;
1612
1613 if (tlen) {
1614 int nnh = 0;
1615 ND_PRINT((ndo, "\n\t nexthop: "));
1616 while (tlen > 0) {
1617 if ( nnh++ > 0 ) {
1618 ND_PRINT((ndo, ", " ));
1619 }
1620 switch(af<<8 | safi) {
1621 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1622 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1623 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1624 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1625 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1626 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1627 case (AFNUM_INET<<8 | SAFNUM_MDT):
1628 if (tlen < sizeof(struct in_addr)) {
1629 ND_PRINT((ndo, "invalid len"));
1630 tlen = 0;
1631 } else {
1632 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1633 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1634 tlen -= sizeof(struct in_addr);
1635 tptr += sizeof(struct in_addr);
1636 }
1637 break;
1638 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1639 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1640 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1641 if (tlen < sizeof(struct in_addr)+BGP_VPN_RD_LEN) {
1642 ND_PRINT((ndo, "invalid len"));
1643 tlen = 0;
1644 } else {
1645 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1646 ND_PRINT((ndo, "RD: %s, %s",
1647 bgp_vpn_rd_print(ndo, tptr),
1648 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1649 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1650 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1651 }
1652 break;
1653 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1654 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1655 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1656 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1657 if (tlen < sizeof(struct in6_addr)) {
1658 ND_PRINT((ndo, "invalid len"));
1659 tlen = 0;
1660 } else {
1661 ND_TCHECK2(tptr[0], sizeof(struct in6_addr));
1662 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr)));
1663 tlen -= sizeof(struct in6_addr);
1664 tptr += sizeof(struct in6_addr);
1665 }
1666 break;
1667 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1668 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1669 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1670 if (tlen < sizeof(struct in6_addr)+BGP_VPN_RD_LEN) {
1671 ND_PRINT((ndo, "invalid len"));
1672 tlen = 0;
1673 } else {
1674 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1675 ND_PRINT((ndo, "RD: %s, %s",
1676 bgp_vpn_rd_print(ndo, tptr),
1677 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1678 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1679 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1680 }
1681 break;
1682 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1683 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1684 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1685 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1686 if (tlen < sizeof(struct in_addr)) {
1687 ND_PRINT((ndo, "invalid len"));
1688 tlen = 0;
1689 } else {
1690 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1691 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1692 tlen -= (sizeof(struct in_addr));
1693 tptr += (sizeof(struct in_addr));
1694 }
1695 break;
1696 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1697 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1698 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1699 ND_TCHECK2(tptr[0], tlen);
1700 ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen)));
1701 tptr += tlen;
1702 tlen = 0;
1703 break;
1704
1705 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1706 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1707 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1708 if (tlen < BGP_VPN_RD_LEN+1) {
1709 ND_PRINT((ndo, "invalid len"));
1710 tlen = 0;
1711 } else {
1712 ND_TCHECK2(tptr[0], tlen);
1713 ND_PRINT((ndo, "RD: %s, %s",
1714 bgp_vpn_rd_print(ndo, tptr),
1715 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1716 /* rfc986 mapped IPv4 address ? */
1717 if (EXTRACT_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
1718 ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4)));
1719 /* rfc1888 mapped IPv6 address ? */
1720 else if (EXTRACT_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
1721 ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3)));
1722 tptr += tlen;
1723 tlen = 0;
1724 }
1725 break;
1726 default:
1727 ND_TCHECK2(tptr[0], tlen);
1728 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1729 if (ndo->ndo_vflag <= 1)
1730 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1731 tptr += tlen;
1732 tlen = 0;
1733 goto done;
1734 break;
1735 }
1736 }
1737 }
1738 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1739 tptr += tlen;
1740
1741 ND_TCHECK_1(tptr);
1742 snpa = EXTRACT_U_1(tptr);
1743 tptr++;
1744
1745 if (snpa) {
1746 ND_PRINT((ndo, "\n\t %u SNPA", snpa));
1747 for (/*nothing*/; snpa > 0; snpa--) {
1748 ND_TCHECK_1(tptr);
1749 ND_PRINT((ndo, "\n\t %d bytes", EXTRACT_U_1(tptr)));
1750 tptr += tptr[0] + 1;
1751 }
1752 } else {
1753 ND_PRINT((ndo, ", no SNPA"));
1754 }
1755
1756 while (tptr < pptr + len) {
1757 switch (af<<8 | safi) {
1758 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1759 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1760 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1761 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1762 if (advance == -1)
1763 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1764 else if (advance == -2)
1765 goto trunc;
1766 else if (advance == -3)
1767 break; /* bytes left, but not enough */
1768 else
1769 ND_PRINT((ndo, "\n\t %s", buf));
1770 break;
1771 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1772 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1773 if (advance == -1)
1774 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1775 else if (advance == -2)
1776 goto trunc;
1777 else if (advance == -3)
1778 break; /* bytes left, but not enough */
1779 else
1780 ND_PRINT((ndo, "\n\t %s", buf));
1781 break;
1782 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1783 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1784 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1785 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1786 if (advance == -1)
1787 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1788 else if (advance == -2)
1789 goto trunc;
1790 else
1791 ND_PRINT((ndo, "\n\t %s", buf));
1792 break;
1793 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1794 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf));
1795 if (advance == -1)
1796 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1797 else if (advance == -2)
1798 goto trunc;
1799 else
1800 ND_PRINT((ndo, "\n\t %s", buf));
1801 break;
1802 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1803 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1804 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1805 if (advance == -1)
1806 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1807 else if (advance == -2)
1808 goto trunc;
1809 else
1810 ND_PRINT((ndo, "\n\t %s", buf));
1811 break;
1812
1813 case (AFNUM_INET<<8 | SAFNUM_MDT):
1814 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1815 if (advance == -1)
1816 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1817 else if (advance == -2)
1818 goto trunc;
1819 else
1820 ND_PRINT((ndo, "\n\t %s", buf));
1821 break;
1822 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1823 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1824 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1825 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1826 if (advance == -1)
1827 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1828 else if (advance == -2)
1829 goto trunc;
1830 else if (advance == -3)
1831 break; /* bytes left, but not enough */
1832 else
1833 ND_PRINT((ndo, "\n\t %s", buf));
1834 break;
1835 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1836 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1837 if (advance == -1)
1838 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1839 else if (advance == -2)
1840 goto trunc;
1841 else if (advance == -3)
1842 break; /* bytes left, but not enough */
1843 else
1844 ND_PRINT((ndo, "\n\t %s", buf));
1845 break;
1846 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1847 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1848 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1849 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1850 if (advance == -1)
1851 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1852 else if (advance == -2)
1853 goto trunc;
1854 else
1855 ND_PRINT((ndo, "\n\t %s", buf));
1856 break;
1857 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1858 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1859 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1860 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1861 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1862 if (advance == -1)
1863 ND_PRINT((ndo, "\n\t (illegal length)"));
1864 else if (advance == -2)
1865 goto trunc;
1866 else
1867 ND_PRINT((ndo, "\n\t %s", buf));
1868 break;
1869 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1870 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1871 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1872 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1873 if (advance == -1)
1874 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1875 else if (advance == -2)
1876 goto trunc;
1877 else
1878 ND_PRINT((ndo, "\n\t %s", buf));
1879 break;
1880 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1881 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1882 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1883 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1884 if (advance == -1)
1885 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1886 else if (advance == -2)
1887 goto trunc;
1888 else
1889 ND_PRINT((ndo, "\n\t %s", buf));
1890 break;
1891 default:
1892 ND_TCHECK2(*tptr,tlen);
1893 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1894 if (ndo->ndo_vflag <= 1)
1895 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1896 advance = 0;
1897 tptr = pptr + len;
1898 break;
1899 }
1900 if (advance < 0)
1901 break;
1902 tptr += advance;
1903 }
1904 done:
1905 break;
1906
1907 case BGPTYPE_MP_UNREACH_NLRI:
1908 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE);
1909 af = EXTRACT_BE_U_2(tptr);
1910 safi = EXTRACT_U_1(tptr + 2);
1911
1912 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1913 tok2str(af_values, "Unknown AFI", af),
1914 af,
1915 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1916 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1917 safi));
1918
1919 if (len == BGP_MP_NLRI_MINSIZE)
1920 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
1921
1922 tptr += 3;
1923
1924 while (tptr < pptr + len) {
1925 switch (af<<8 | safi) {
1926 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1927 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1928 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1929 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1930 if (advance == -1)
1931 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1932 else if (advance == -2)
1933 goto trunc;
1934 else if (advance == -3)
1935 break; /* bytes left, but not enough */
1936 else
1937 ND_PRINT((ndo, "\n\t %s", buf));
1938 break;
1939 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1940 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1941 if (advance == -1)
1942 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1943 else if (advance == -2)
1944 goto trunc;
1945 else if (advance == -3)
1946 break; /* bytes left, but not enough */
1947 else
1948 ND_PRINT((ndo, "\n\t %s", buf));
1949 break;
1950 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1951 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1952 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1953 advance = decode_labeled_vpn_prefix4(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 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1962 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1963 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1964 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1965 if (advance == -1)
1966 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1967 else if (advance == -2)
1968 goto trunc;
1969 else if (advance == -3)
1970 break; /* bytes left, but not enough */
1971 else
1972 ND_PRINT((ndo, "\n\t %s", buf));
1973 break;
1974 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1975 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1976 if (advance == -1)
1977 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1978 else if (advance == -2)
1979 goto trunc;
1980 else if (advance == -3)
1981 break; /* bytes left, but not enough */
1982 else
1983 ND_PRINT((ndo, "\n\t %s", buf));
1984 break;
1985 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1986 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1987 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1988 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1989 if (advance == -1)
1990 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1991 else if (advance == -2)
1992 goto trunc;
1993 else
1994 ND_PRINT((ndo, "\n\t %s", buf));
1995 break;
1996 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1997 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1998 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1999 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
2000 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
2001 if (advance == -1)
2002 ND_PRINT((ndo, "\n\t (illegal length)"));
2003 else if (advance == -2)
2004 goto trunc;
2005 else
2006 ND_PRINT((ndo, "\n\t %s", buf));
2007 break;
2008 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
2009 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
2010 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2011 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2012 if (advance == -1)
2013 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2014 else if (advance == -2)
2015 goto trunc;
2016 else
2017 ND_PRINT((ndo, "\n\t %s", buf));
2018 break;
2019 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2020 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2021 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2022 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2023 if (advance == -1)
2024 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2025 else if (advance == -2)
2026 goto trunc;
2027 else
2028 ND_PRINT((ndo, "\n\t %s", buf));
2029 break;
2030 case (AFNUM_INET<<8 | SAFNUM_MDT):
2031 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
2032 if (advance == -1)
2033 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2034 else if (advance == -2)
2035 goto trunc;
2036 else
2037 ND_PRINT((ndo, "\n\t %s", buf));
2038 break;
2039 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
2040 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
2041 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
2042 if (advance == -1)
2043 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2044 else if (advance == -2)
2045 goto trunc;
2046 else
2047 ND_PRINT((ndo, "\n\t %s", buf));
2048 break;
2049 default:
2050 ND_TCHECK2(*(tptr-3),tlen);
2051 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
2052 if (ndo->ndo_vflag <= 1)
2053 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
2054 advance = 0;
2055 tptr = pptr + len;
2056 break;
2057 }
2058 if (advance < 0)
2059 break;
2060 tptr += advance;
2061 }
2062 break;
2063 case BGPTYPE_EXTD_COMMUNITIES:
2064 if (len % 8) {
2065 ND_PRINT((ndo, "invalid len"));
2066 break;
2067 }
2068 while (tlen>0) {
2069 uint16_t extd_comm;
2070
2071 ND_TCHECK_2(tptr);
2072 extd_comm=EXTRACT_BE_U_2(tptr);
2073
2074 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]",
2075 tok2str(bgp_extd_comm_subtype_values,
2076 "unknown extd community typecode",
2077 extd_comm),
2078 extd_comm,
2079 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2080
2081 ND_TCHECK_6(tptr + 2);
2082 switch(extd_comm) {
2083 case BGP_EXT_COM_RT_0:
2084 case BGP_EXT_COM_RO_0:
2085 case BGP_EXT_COM_L2VPN_RT_0:
2086 ND_PRINT((ndo, ": %u:%u (= %s)",
2087 EXTRACT_BE_U_2(tptr + 2),
2088 EXTRACT_BE_U_4(tptr + 4),
2089 ipaddr_string(ndo, tptr+4)));
2090 break;
2091 case BGP_EXT_COM_RT_1:
2092 case BGP_EXT_COM_RO_1:
2093 case BGP_EXT_COM_L2VPN_RT_1:
2094 case BGP_EXT_COM_VRF_RT_IMP:
2095 ND_PRINT((ndo, ": %s:%u",
2096 ipaddr_string(ndo, tptr+2),
2097 EXTRACT_BE_U_2(tptr + 6)));
2098 break;
2099 case BGP_EXT_COM_RT_2:
2100 case BGP_EXT_COM_RO_2:
2101 ND_PRINT((ndo, ": %s:%u",
2102 as_printf(ndo, astostr, sizeof(astostr),
2103 EXTRACT_BE_U_4(tptr + 2)), EXTRACT_BE_U_2(tptr + 6)));
2104 break;
2105 case BGP_EXT_COM_LINKBAND:
2106 bw.i = EXTRACT_BE_U_4(tptr + 2);
2107 ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2108 bw.f*8/1000000));
2109 break;
2110 case BGP_EXT_COM_VPN_ORIGIN:
2111 case BGP_EXT_COM_VPN_ORIGIN2:
2112 case BGP_EXT_COM_VPN_ORIGIN3:
2113 case BGP_EXT_COM_VPN_ORIGIN4:
2114 case BGP_EXT_COM_OSPF_RID:
2115 case BGP_EXT_COM_OSPF_RID2:
2116 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2)));
2117 break;
2118 case BGP_EXT_COM_OSPF_RTYPE:
2119 case BGP_EXT_COM_OSPF_RTYPE2:
2120 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2121 ipaddr_string(ndo, tptr+2),
2122 tok2str(bgp_extd_comm_ospf_rtype_values,
2123 "unknown (0x%02x)",
2124 EXTRACT_U_1((tptr + 6))),
2125 (EXTRACT_U_1(tptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2126 ((EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_EXT) || (EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2127 break;
2128 case BGP_EXT_COM_L2INFO:
2129 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2130 tok2str(l2vpn_encaps_values,
2131 "unknown encaps",
2132 EXTRACT_U_1((tptr + 2))),
2133 EXTRACT_U_1((tptr + 3)),
2134 EXTRACT_BE_U_2(tptr + 4)));
2135 break;
2136 case BGP_EXT_COM_SOURCE_AS:
2137 ND_PRINT((ndo, ": AS %u", EXTRACT_BE_U_2(tptr + 2)));
2138 break;
2139 default:
2140 ND_TCHECK_8(tptr);
2141 print_unknown_data(ndo, tptr, "\n\t ", 8);
2142 break;
2143 }
2144 tlen -=8;
2145 tptr +=8;
2146 }
2147 break;
2148
2149 case BGPTYPE_PMSI_TUNNEL:
2150 {
2151 uint8_t tunnel_type, flags;
2152
2153 ND_TCHECK_5(tptr);
2154 flags = EXTRACT_U_1(tptr);
2155 tunnel_type = EXTRACT_U_1(tptr + 1);
2156 tlen = len;
2157
2158 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2159 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2160 tunnel_type,
2161 bittok2str(bgp_pmsi_flag_values, "none", flags),
2162 EXTRACT_BE_U_3(tptr + 2)>>4));
2163
2164 tptr +=5;
2165 tlen -= 5;
2166
2167 switch (tunnel_type) {
2168 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2169 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2170 ND_TCHECK_8(tptr);
2171 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s",
2172 ipaddr_string(ndo, tptr),
2173 ipaddr_string(ndo, tptr+4)));
2174 break;
2175
2176 case BGP_PMSI_TUNNEL_PIM_SSM:
2177 ND_TCHECK_8(tptr);
2178 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s",
2179 ipaddr_string(ndo, tptr),
2180 ipaddr_string(ndo, tptr+4)));
2181 break;
2182 case BGP_PMSI_TUNNEL_INGRESS:
2183 ND_TCHECK_4(tptr);
2184 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s",
2185 ipaddr_string(ndo, tptr)));
2186 break;
2187 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2188 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2189 ND_TCHECK_8(tptr);
2190 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x",
2191 ipaddr_string(ndo, tptr),
2192 EXTRACT_BE_U_4(tptr + 4)));
2193 break;
2194 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2195 ND_TCHECK_8(tptr);
2196 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2197 ipaddr_string(ndo, tptr),
2198 EXTRACT_BE_U_4(tptr + 4)));
2199 break;
2200 default:
2201 if (ndo->ndo_vflag <= 1) {
2202 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2203 }
2204 }
2205 break;
2206 }
2207 case BGPTYPE_AIGP:
2208 {
2209 uint8_t type;
2210 uint16_t length;
2211
2212 tlen = len;
2213
2214 while (tlen >= 3) {
2215
2216 ND_TCHECK_3(tptr);
2217
2218 type = EXTRACT_U_1(tptr);
2219 length = EXTRACT_BE_U_2(tptr + 1);
2220 tptr += 3;
2221 tlen -= 3;
2222
2223 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u",
2224 tok2str(bgp_aigp_values, "Unknown", type),
2225 type, length));
2226
2227 if (length < 3)
2228 goto trunc;
2229 length -= 3;
2230
2231 /*
2232 * Check if we can read the TLV data.
2233 */
2234 ND_TCHECK2(tptr[3], length);
2235
2236 switch (type) {
2237
2238 case BGP_AIGP_TLV:
2239 if (length < 8)
2240 goto trunc;
2241 ND_PRINT((ndo, ", metric %" PRIu64,
2242 EXTRACT_BE_U_8(tptr)));
2243 break;
2244
2245 default:
2246 if (ndo->ndo_vflag <= 1) {
2247 print_unknown_data(ndo, tptr,"\n\t ", length);
2248 }
2249 }
2250
2251 tptr += length;
2252 tlen -= length;
2253 }
2254 break;
2255 }
2256 case BGPTYPE_ATTR_SET:
2257 ND_TCHECK_4(tptr);
2258 if (len < 4)
2259 goto trunc;
2260 ND_PRINT((ndo, "\n\t Origin AS: %s",
2261 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr))));
2262 tptr+=4;
2263 len -=4;
2264
2265 while (len) {
2266 u_int aflags, alenlen, alen;
2267
2268 ND_TCHECK_2(tptr);
2269 if (len < 2)
2270 goto trunc;
2271 aflags = EXTRACT_U_1(tptr);
2272 atype = EXTRACT_U_1(tptr + 1);
2273 tptr += 2;
2274 len -= 2;
2275 alenlen = bgp_attr_lenlen(aflags, tptr);
2276 ND_TCHECK2(tptr[0], alenlen);
2277 if (len < alenlen)
2278 goto trunc;
2279 alen = bgp_attr_len(aflags, tptr);
2280 tptr += alenlen;
2281 len -= alenlen;
2282
2283 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2284 tok2str(bgp_attr_values,
2285 "Unknown Attribute", atype),
2286 atype,
2287 alen));
2288
2289 if (aflags) {
2290 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2291 aflags & 0x80 ? "O" : "",
2292 aflags & 0x40 ? "T" : "",
2293 aflags & 0x20 ? "P" : "",
2294 aflags & 0x10 ? "E" : ""));
2295 if (aflags & 0xf)
2296 ND_PRINT((ndo, "+%x", aflags & 0xf));
2297 ND_PRINT((ndo, "]: "));
2298 }
2299 /* FIXME check for recursion */
2300 if (!bgp_attr_print(ndo, atype, tptr, alen))
2301 return 0;
2302 tptr += alen;
2303 len -= alen;
2304 }
2305 break;
2306
2307 case BGPTYPE_LARGE_COMMUNITY:
2308 if (len == 0 || len % 12) {
2309 ND_PRINT((ndo, "invalid len"));
2310 break;
2311 }
2312 ND_PRINT((ndo, "\n\t "));
2313 while (len > 0) {
2314 ND_TCHECK2(*tptr, 12);
2315 ND_PRINT((ndo, "%u:%u:%u%s",
2316 EXTRACT_BE_U_4(tptr),
2317 EXTRACT_BE_U_4(tptr + 4),
2318 EXTRACT_BE_U_4(tptr + 8),
2319 (len > 12) ? ", " : ""));
2320 tptr += 12;
2321 len -= 12;
2322 }
2323 break;
2324 default:
2325 ND_TCHECK2(*pptr,len);
2326 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2327 if (ndo->ndo_vflag <= 1)
2328 print_unknown_data(ndo, pptr, "\n\t ", len);
2329 break;
2330 }
2331 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2332 ND_TCHECK2(*pptr,len);
2333 print_unknown_data(ndo, pptr, "\n\t ", len);
2334 }
2335 return 1;
2336
2337 trunc:
2338 return 0;
2339 }
2340
2341 static void
2342 bgp_capabilities_print(netdissect_options *ndo,
2343 const u_char *opt, int caps_len)
2344 {
2345 int cap_type, cap_len, tcap_len, cap_offset;
2346 int i = 0;
2347
2348 while (i < caps_len) {
2349 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE);
2350 cap_type=EXTRACT_U_1(opt + i);
2351 cap_len=EXTRACT_U_1(opt + i + 1);
2352 tcap_len=cap_len;
2353 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2354 tok2str(bgp_capcode_values, "Unknown",
2355 cap_type),
2356 cap_type,
2357 cap_len));
2358 ND_TCHECK2(opt[i+2], cap_len);
2359 switch (cap_type) {
2360 case BGP_CAPCODE_MP:
2361 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2362 tok2str(af_values, "Unknown",
2363 EXTRACT_BE_U_2(opt + i + 2)),
2364 EXTRACT_BE_U_2(opt + i + 2),
2365 tok2str(bgp_safi_values, "Unknown",
2366 EXTRACT_U_1(opt + i + 5)),
2367 EXTRACT_U_1(opt + i + 5)));
2368 break;
2369 case BGP_CAPCODE_RESTART:
2370 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2371 ((EXTRACT_U_1(opt + i + 2))&0x80) ? "R" : "none",
2372 EXTRACT_BE_U_2(opt + i + 2)&0xfff));
2373 tcap_len-=2;
2374 cap_offset=4;
2375 while(tcap_len>=4) {
2376 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2377 tok2str(af_values,"Unknown",
2378 EXTRACT_BE_U_2(opt + i + cap_offset)),
2379 EXTRACT_BE_U_2(opt + i + cap_offset),
2380 tok2str(bgp_safi_values,"Unknown",
2381 EXTRACT_U_1(opt + i + cap_offset + 2)),
2382 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2383 ((EXTRACT_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" ));
2384 tcap_len-=4;
2385 cap_offset+=4;
2386 }
2387 break;
2388 case BGP_CAPCODE_RR:
2389 case BGP_CAPCODE_RR_CISCO:
2390 break;
2391 case BGP_CAPCODE_AS_NEW:
2392
2393 /*
2394 * Extract the 4 byte AS number encoded.
2395 */
2396 if (cap_len == 4) {
2397 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2398 as_printf(ndo, astostr, sizeof(astostr),
2399 EXTRACT_BE_U_4(opt + i + 2))));
2400 }
2401 break;
2402 case BGP_CAPCODE_ADD_PATH:
2403 cap_offset=2;
2404 if (tcap_len == 0) {
2405 ND_PRINT((ndo, " (bogus)")); /* length */
2406 break;
2407 }
2408 while (tcap_len > 0) {
2409 if (tcap_len < 4) {
2410 ND_PRINT((ndo, "\n\t\t(invalid)"));
2411 break;
2412 }
2413 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2414 tok2str(af_values,"Unknown",EXTRACT_BE_U_2(opt + i + cap_offset)),
2415 EXTRACT_BE_U_2(opt + i + cap_offset),
2416 tok2str(bgp_safi_values,"Unknown",EXTRACT_U_1(opt + i + cap_offset + 2)),
2417 EXTRACT_U_1(opt + (i + cap_offset + 2)),
2418 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",EXTRACT_U_1(opt + i + cap_offset + 3))
2419 ));
2420 tcap_len-=4;
2421 cap_offset+=4;
2422 }
2423 break;
2424 default:
2425 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2426 cap_type));
2427 if (ndo->ndo_vflag <= 1)
2428 print_unknown_data(ndo, opt + i + 2, "\n\t\t",
2429 cap_len);
2430 break;
2431 }
2432 if (ndo->ndo_vflag > 1 && cap_len > 0) {
2433 print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
2434 }
2435 i += BGP_CAP_HEADER_SIZE + cap_len;
2436 }
2437 return;
2438
2439 trunc:
2440 ND_PRINT((ndo, "[|BGP]"));
2441 }
2442
2443 static void
2444 bgp_open_print(netdissect_options *ndo,
2445 const u_char *dat, int length)
2446 {
2447 struct bgp_open bgpo;
2448 struct bgp_opt bgpopt;
2449 const u_char *opt;
2450 int i;
2451
2452 ND_TCHECK2(dat[0], BGP_OPEN_SIZE);
2453 memcpy(&bgpo, dat, BGP_OPEN_SIZE);
2454
2455 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version));
2456 ND_PRINT((ndo, "my AS %s, ",
2457 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas))));
2458 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime)));
2459 ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgpo.bgpo_id)));
2460 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen));
2461
2462 /* some little sanity checking */
2463 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE)
2464 return;
2465
2466 /* ugly! */
2467 opt = &((const struct bgp_open *)dat)->bgpo_optlen;
2468 opt++;
2469
2470 i = 0;
2471 while (i < bgpo.bgpo_optlen) {
2472 ND_TCHECK2(opt[i], BGP_OPT_SIZE);
2473 memcpy(&bgpopt, opt + i, BGP_OPT_SIZE);
2474 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
2475 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len));
2476 break;
2477 }
2478
2479 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u",
2480 tok2str(bgp_opt_values,"Unknown",
2481 bgpopt.bgpopt_type),
2482 bgpopt.bgpopt_type,
2483 bgpopt.bgpopt_len));
2484
2485 /* now let's decode the options we know*/
2486 switch(bgpopt.bgpopt_type) {
2487
2488 case BGP_OPT_CAP:
2489 bgp_capabilities_print(ndo, opt + i + BGP_OPT_SIZE,
2490 bgpopt.bgpopt_len);
2491 break;
2492
2493 case BGP_OPT_AUTH:
2494 default:
2495 ND_PRINT((ndo, "\n\t no decoder for option %u",
2496 bgpopt.bgpopt_type));
2497 break;
2498 }
2499 i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
2500 }
2501 return;
2502 trunc:
2503 ND_PRINT((ndo, "[|BGP]"));
2504 }
2505
2506 static void
2507 bgp_update_print(netdissect_options *ndo,
2508 const u_char *dat, int length)
2509 {
2510 struct bgp bgp;
2511 const u_char *p;
2512 int withdrawn_routes_len;
2513 int len;
2514 int i;
2515
2516 ND_TCHECK2(dat[0], BGP_SIZE);
2517 if (length < BGP_SIZE)
2518 goto trunc;
2519 memcpy(&bgp, dat, BGP_SIZE);
2520 p = dat + BGP_SIZE; /*XXX*/
2521 length -= BGP_SIZE;
2522
2523 /* Unfeasible routes */
2524 ND_TCHECK_2(p);
2525 if (length < 2)
2526 goto trunc;
2527 withdrawn_routes_len = EXTRACT_BE_U_2(p);
2528 p += 2;
2529 length -= 2;
2530 if (withdrawn_routes_len) {
2531 /*
2532 * Without keeping state from the original NLRI message,
2533 * it's not possible to tell if this a v4 or v6 route,
2534 * so only try to decode it if we're not v6 enabled.
2535 */
2536 ND_TCHECK2(p[0], withdrawn_routes_len);
2537 if (length < withdrawn_routes_len)
2538 goto trunc;
2539 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len));
2540 p += withdrawn_routes_len;
2541 length -= withdrawn_routes_len;
2542 }
2543
2544 ND_TCHECK_2(p);
2545 if (length < 2)
2546 goto trunc;
2547 len = EXTRACT_BE_U_2(p);
2548 p += 2;
2549 length -= 2;
2550
2551 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2552 /* No withdrawn routes, no path attributes, no NLRI */
2553 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2554 return;
2555 }
2556
2557 if (len) {
2558 /* do something more useful!*/
2559 while (len) {
2560 int aflags, atype, alenlen, alen;
2561
2562 ND_TCHECK_2(p);
2563 if (len < 2)
2564 goto trunc;
2565 if (length < 2)
2566 goto trunc;
2567 aflags = EXTRACT_U_1(p);
2568 atype = EXTRACT_U_1(p + 1);
2569 p += 2;
2570 len -= 2;
2571 length -= 2;
2572 alenlen = bgp_attr_lenlen(aflags, p);
2573 ND_TCHECK2(p[0], alenlen);
2574 if (len < alenlen)
2575 goto trunc;
2576 if (length < alenlen)
2577 goto trunc;
2578 alen = bgp_attr_len(aflags, p);
2579 p += alenlen;
2580 len -= alenlen;
2581 length -= alenlen;
2582
2583 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2584 tok2str(bgp_attr_values, "Unknown Attribute",
2585 atype),
2586 atype,
2587 alen));
2588
2589 if (aflags) {
2590 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2591 aflags & 0x80 ? "O" : "",
2592 aflags & 0x40 ? "T" : "",
2593 aflags & 0x20 ? "P" : "",
2594 aflags & 0x10 ? "E" : ""));
2595 if (aflags & 0xf)
2596 ND_PRINT((ndo, "+%x", aflags & 0xf));
2597 ND_PRINT((ndo, "]: "));
2598 }
2599 if (len < alen)
2600 goto trunc;
2601 if (length < alen)
2602 goto trunc;
2603 if (!bgp_attr_print(ndo, atype, p, alen))
2604 goto trunc;
2605 p += alen;
2606 len -= alen;
2607 length -= alen;
2608 }
2609 }
2610
2611 if (length) {
2612 /*
2613 * XXX - what if they're using the "Advertisement of
2614 * Multiple Paths in BGP" feature:
2615 *
2616 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/
2617 *
2618 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06
2619 */
2620 ND_PRINT((ndo, "\n\t Updated routes:"));
2621 while (length) {
2622 char buf[MAXHOSTNAMELEN + 100];
2623 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2624 if (i == -1) {
2625 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2626 break;
2627 } else if (i == -2)
2628 goto trunc;
2629 else if (i == -3)
2630 goto trunc; /* bytes left, but not enough */
2631 else {
2632 ND_PRINT((ndo, "\n\t %s", buf));
2633 p += i;
2634 length -= i;
2635 }
2636 }
2637 }
2638 return;
2639 trunc:
2640 ND_PRINT((ndo, "[|BGP]"));
2641 }
2642
2643 static void
2644 bgp_notification_print(netdissect_options *ndo,
2645 const u_char *dat, int length)
2646 {
2647 struct bgp_notification bgpn;
2648 const u_char *tptr;
2649 uint8_t shutdown_comm_length;
2650 uint8_t remainder_offset;
2651
2652 ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
2653 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
2654
2655 /* some little sanity checking */
2656 if (length<BGP_NOTIFICATION_SIZE)
2657 return;
2658
2659 ND_PRINT((ndo, ", %s (%u)",
2660 tok2str(bgp_notify_major_values, "Unknown Error",
2661 bgpn.bgpn_major),
2662 bgpn.bgpn_major));
2663
2664 switch (bgpn.bgpn_major) {
2665
2666 case BGP_NOTIFY_MAJOR_MSG:
2667 ND_PRINT((ndo, ", subcode %s (%u)",
2668 tok2str(bgp_notify_minor_msg_values, "Unknown",
2669 bgpn.bgpn_minor),
2670 bgpn.bgpn_minor));
2671 break;
2672 case BGP_NOTIFY_MAJOR_OPEN:
2673 ND_PRINT((ndo, ", subcode %s (%u)",
2674 tok2str(bgp_notify_minor_open_values, "Unknown",
2675 bgpn.bgpn_minor),
2676 bgpn.bgpn_minor));
2677 break;
2678 case BGP_NOTIFY_MAJOR_UPDATE:
2679 ND_PRINT((ndo, ", subcode %s (%u)",
2680 tok2str(bgp_notify_minor_update_values, "Unknown",
2681 bgpn.bgpn_minor),
2682 bgpn.bgpn_minor));
2683 break;
2684 case BGP_NOTIFY_MAJOR_FSM:
2685 ND_PRINT((ndo, " subcode %s (%u)",
2686 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2687 bgpn.bgpn_minor),
2688 bgpn.bgpn_minor));
2689 break;
2690 case BGP_NOTIFY_MAJOR_CAP:
2691 ND_PRINT((ndo, " subcode %s (%u)",
2692 tok2str(bgp_notify_minor_cap_values, "Unknown",
2693 bgpn.bgpn_minor),
2694 bgpn.bgpn_minor));
2695 break;
2696 case BGP_NOTIFY_MAJOR_CEASE:
2697 ND_PRINT((ndo, ", subcode %s (%u)",
2698 tok2str(bgp_notify_minor_cease_values, "Unknown",
2699 bgpn.bgpn_minor),
2700 bgpn.bgpn_minor));
2701
2702 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2703 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2704 */
2705 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2706 tptr = dat + BGP_NOTIFICATION_SIZE;
2707 ND_TCHECK_7(tptr);
2708 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2709 tok2str(af_values, "Unknown",
2710 EXTRACT_BE_U_2(tptr)),
2711 EXTRACT_BE_U_2(tptr),
2712 tok2str(bgp_safi_values, "Unknown", EXTRACT_U_1((tptr + 2))),
2713 EXTRACT_U_1((tptr + 2)),
2714 EXTRACT_BE_U_4(tptr + 3)));
2715 }
2716 /*
2717 * draft-ietf-idr-shutdown describes a method to send a communication
2718 * intended for human consumption regarding the Administrative Shutdown
2719 */
2720 if ((bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
2721 bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
2722 length >= BGP_NOTIFICATION_SIZE + 1) {
2723 tptr = dat + BGP_NOTIFICATION_SIZE;
2724 ND_TCHECK_1(tptr);
2725 shutdown_comm_length = EXTRACT_U_1(tptr);
2726 remainder_offset = 0;
2727 /* garbage, hexdump it all */
2728 if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN ||
2729 shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) {
2730 ND_PRINT((ndo, ", invalid Shutdown Communication length"));
2731 }
2732 else if (shutdown_comm_length == 0) {
2733 ND_PRINT((ndo, ", empty Shutdown Communication"));
2734 remainder_offset += 1;
2735 }
2736 /* a proper shutdown communication */
2737 else {
2738 ND_TCHECK2(*(tptr+1), shutdown_comm_length);
2739 ND_PRINT((ndo, ", Shutdown Communication (length: %u): \"", shutdown_comm_length));
2740 (void)fn_printn(ndo, tptr+1, shutdown_comm_length, NULL);
2741 ND_PRINT((ndo, "\""));
2742 remainder_offset += shutdown_comm_length + 1;
2743 }
2744 /* if there is trailing data, hexdump it */
2745 if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) {
2746 ND_PRINT((ndo, ", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE)));
2747 hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2748 }
2749 }
2750 break;
2751 default:
2752 break;
2753 }
2754
2755 return;
2756 trunc:
2757 ND_PRINT((ndo, "[|BGP]"));
2758 }
2759
2760 static void
2761 bgp_route_refresh_print(netdissect_options *ndo,
2762 const u_char *pptr, int len)
2763 {
2764 const struct bgp_route_refresh *bgp_route_refresh_header;
2765
2766 ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE);
2767
2768 /* some little sanity checking */
2769 if (len<BGP_ROUTE_REFRESH_SIZE)
2770 return;
2771
2772 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2773
2774 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)",
2775 tok2str(af_values,"Unknown",
2776 /* this stinks but the compiler pads the structure
2777 * weird */
2778 EXTRACT_BE_U_2(&bgp_route_refresh_header->afi)),
2779 EXTRACT_BE_U_2(&bgp_route_refresh_header->afi),
2780 tok2str(bgp_safi_values,"Unknown",
2781 bgp_route_refresh_header->safi),
2782 bgp_route_refresh_header->safi));
2783
2784 if (ndo->ndo_vflag > 1) {
2785 ND_TCHECK2(*pptr, len);
2786 print_unknown_data(ndo, pptr, "\n\t ", len);
2787 }
2788
2789 return;
2790 trunc:
2791 ND_PRINT((ndo, "[|BGP]"));
2792 }
2793
2794 static int
2795 bgp_header_print(netdissect_options *ndo,
2796 const u_char *dat, int length)
2797 {
2798 struct bgp bgp;
2799
2800 ND_TCHECK2(dat[0], BGP_SIZE);
2801 memcpy(&bgp, dat, BGP_SIZE);
2802 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2803 tok2str(bgp_msg_values, "Unknown", bgp.bgp_type),
2804 bgp.bgp_type,
2805 length));
2806
2807 switch (bgp.bgp_type) {
2808 case BGP_OPEN:
2809 bgp_open_print(ndo, dat, length);
2810 break;
2811 case BGP_UPDATE:
2812 bgp_update_print(ndo, dat, length);
2813 break;
2814 case BGP_NOTIFICATION:
2815 bgp_notification_print(ndo, dat, length);
2816 break;
2817 case BGP_KEEPALIVE:
2818 break;
2819 case BGP_ROUTE_REFRESH:
2820 bgp_route_refresh_print(ndo, dat, length);
2821 break;
2822 default:
2823 /* we have no decoder for the BGP message */
2824 ND_TCHECK2(*dat, length);
2825 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type));
2826 print_unknown_data(ndo, dat, "\n\t ", length);
2827 break;
2828 }
2829 return 1;
2830 trunc:
2831 ND_PRINT((ndo, "[|BGP]"));
2832 return 0;
2833 }
2834
2835 void
2836 bgp_print(netdissect_options *ndo,
2837 const u_char *dat, int length)
2838 {
2839 const u_char *p;
2840 const u_char *ep;
2841 const u_char *start;
2842 const u_char marker[] = {
2843 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2844 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2845 };
2846 struct bgp bgp;
2847 uint16_t hlen;
2848
2849 ep = dat + length;
2850 if (ndo->ndo_snapend < dat + length)
2851 ep = ndo->ndo_snapend;
2852
2853 ND_PRINT((ndo, ": BGP"));
2854
2855 if (ndo->ndo_vflag < 1) /* lets be less chatty */
2856 return;
2857
2858 p = dat;
2859 start = p;
2860 while (p < ep) {
2861 if (!ND_TTEST_1(p))
2862 break;
2863 if (EXTRACT_U_1(p) != 0xff) {
2864 p++;
2865 continue;
2866 }
2867
2868 if (!ND_TTEST2(p[0], sizeof(marker)))
2869 break;
2870 if (memcmp(p, marker, sizeof(marker)) != 0) {
2871 p++;
2872 continue;
2873 }
2874
2875 /* found BGP header */
2876 ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/
2877 memcpy(&bgp, p, BGP_SIZE);
2878
2879 if (start != p)
2880 ND_PRINT((ndo, " [|BGP]"));
2881
2882 hlen = ntohs(bgp.bgp_len);
2883 if (hlen < BGP_SIZE) {
2884 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
2885 BGP_SIZE));
2886 break;
2887 }
2888
2889 if (ND_TTEST2(p[0], hlen)) {
2890 if (!bgp_header_print(ndo, p, hlen))
2891 return;
2892 p += hlen;
2893 start = p;
2894 } else {
2895 ND_PRINT((ndo, "\n[|BGP %s]",
2896 tok2str(bgp_msg_values,
2897 "Unknown Message Type",
2898 bgp.bgp_type)));
2899 break;
2900 }
2901 }
2902
2903 return;
2904
2905 trunc:
2906 ND_PRINT((ndo, " [|BGP]"));
2907 }
2908
2909 /*
2910 * Local Variables:
2911 * c-style: whitesmith
2912 * c-basic-offset: 4
2913 * End:
2914 */
[mirror] the TCPdump network dissector