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1 /*
2 * Copyright (C) 1999 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * Extensively modified by Hannes Gredler (hannes@gredler.at) for more
30 * complete BGP support.
31 */
32
33 /* \summary: Border Gateway Protocol (BGP) printer */
34
35 #ifdef HAVE_CONFIG_H
36 #include "config.h"
37 #endif
38
39 #include <netdissect-stdinc.h>
40
41 #include <stdio.h>
42 #include <string.h>
43
44 #include "netdissect.h"
45 #include "addrtoname.h"
46 #include "extract.h"
47 #include "af.h"
48 #include "l2vpn.h"
49
50 struct bgp {
51 uint8_t bgp_marker[16];
52 uint16_t bgp_len;
53 uint8_t bgp_type;
54 };
55 #define BGP_SIZE 19 /* unaligned */
56
57 #define BGP_OPEN 1
58 #define BGP_UPDATE 2
59 #define BGP_NOTIFICATION 3
60 #define BGP_KEEPALIVE 4
61 #define BGP_ROUTE_REFRESH 5
62
63 static const struct tok bgp_msg_values[] = {
64 { BGP_OPEN, "Open"},
65 { BGP_UPDATE, "Update"},
66 { BGP_NOTIFICATION, "Notification"},
67 { BGP_KEEPALIVE, "Keepalive"},
68 { BGP_ROUTE_REFRESH, "Route Refresh"},
69 { 0, NULL}
70 };
71
72 struct bgp_open {
73 uint8_t bgpo_marker[16];
74 uint16_t bgpo_len;
75 uint8_t bgpo_type;
76 uint8_t bgpo_version;
77 uint16_t bgpo_myas;
78 uint16_t bgpo_holdtime;
79 uint32_t bgpo_id;
80 uint8_t bgpo_optlen;
81 /* options should follow */
82 };
83 #define BGP_OPEN_SIZE 29 /* unaligned */
84
85 struct bgp_opt {
86 uint8_t bgpopt_type;
87 uint8_t bgpopt_len;
88 /* variable length */
89 };
90 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
91 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
92
93 struct bgp_notification {
94 uint8_t bgpn_marker[16];
95 uint16_t bgpn_len;
96 uint8_t bgpn_type;
97 uint8_t bgpn_major;
98 uint8_t bgpn_minor;
99 };
100 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
101
102 struct bgp_route_refresh {
103 uint8_t bgp_marker[16];
104 uint16_t len;
105 uint8_t type;
106 uint8_t afi[2]; /* the compiler messes this structure up */
107 uint8_t res; /* when doing misaligned sequences of int8 and int16 */
108 uint8_t safi; /* afi should be int16 - so we have to access it using */
109 }; /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh) */
110 #define BGP_ROUTE_REFRESH_SIZE 23
111
112 #define bgp_attr_lenlen(flags, p) \
113 (((flags) & 0x10) ? 2 : 1)
114 #define bgp_attr_len(flags, p) \
115 (((flags) & 0x10) ? EXTRACT_16BITS(p) : *(p))
116
117 #define BGPTYPE_ORIGIN 1
118 #define BGPTYPE_AS_PATH 2
119 #define BGPTYPE_NEXT_HOP 3
120 #define BGPTYPE_MULTI_EXIT_DISC 4
121 #define BGPTYPE_LOCAL_PREF 5
122 #define BGPTYPE_ATOMIC_AGGREGATE 6
123 #define BGPTYPE_AGGREGATOR 7
124 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
125 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */
126 #define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */
127 #define BGPTYPE_DPA 11 /* deprecated, draft-ietf-idr-bgp-dpa */
128 #define BGPTYPE_ADVERTISERS 12 /* deprecated RFC1863 */
129 #define BGPTYPE_RCID_PATH 13 /* deprecated RFC1863 */
130 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */
131 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */
132 #define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */
133 #define BGPTYPE_AS4_PATH 17 /* RFC6793 */
134 #define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */
135 #define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */
136 #define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */
137 #define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */
138 #define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */
139 #define BGPTYPE_AIGP 26 /* RFC7311 */
140 #define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */
141 #define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */
142 #define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */
143 #define BGPTYPE_ATTR_SET 128 /* RFC6368 */
144
145 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
146
147 static const struct tok bgp_attr_values[] = {
148 { BGPTYPE_ORIGIN, "Origin"},
149 { BGPTYPE_AS_PATH, "AS Path"},
150 { BGPTYPE_AS4_PATH, "AS4 Path"},
151 { BGPTYPE_NEXT_HOP, "Next Hop"},
152 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
153 { BGPTYPE_LOCAL_PREF, "Local Preference"},
154 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
155 { BGPTYPE_AGGREGATOR, "Aggregator"},
156 { BGPTYPE_AGGREGATOR4, "Aggregator4"},
157 { BGPTYPE_COMMUNITIES, "Community"},
158 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
159 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
160 { BGPTYPE_DPA, "DPA"},
161 { BGPTYPE_ADVERTISERS, "Advertisers"},
162 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"},
163 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
164 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
165 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
166 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
167 { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"},
168 { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"},
169 { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
170 { BGPTYPE_AIGP, "Accumulated IGP Metric"},
171 { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
172 { BGPTYPE_ENTROPY_LABEL, "Entropy Label"},
173 { BGPTYPE_LARGE_COMMUNITY, "Large Community"},
174 { BGPTYPE_ATTR_SET, "Attribute Set"},
175 { 255, "Reserved for development"},
176 { 0, NULL}
177 };
178
179 #define BGP_AS_SET 1
180 #define BGP_AS_SEQUENCE 2
181 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
182 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
183
184 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
185 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
186
187 static const struct tok bgp_as_path_segment_open_values[] = {
188 { BGP_AS_SEQUENCE, ""},
189 { BGP_AS_SET, "{ "},
190 { BGP_CONFED_AS_SEQUENCE, "( "},
191 { BGP_CONFED_AS_SET, "({ "},
192 { 0, NULL}
193 };
194
195 static const struct tok bgp_as_path_segment_close_values[] = {
196 { BGP_AS_SEQUENCE, ""},
197 { BGP_AS_SET, "}"},
198 { BGP_CONFED_AS_SEQUENCE, ")"},
199 { BGP_CONFED_AS_SET, "})"},
200 { 0, NULL}
201 };
202
203 #define BGP_OPT_AUTH 1
204 #define BGP_OPT_CAP 2
205
206 static const struct tok bgp_opt_values[] = {
207 { BGP_OPT_AUTH, "Authentication Information"},
208 { BGP_OPT_CAP, "Capabilities Advertisement"},
209 { 0, NULL}
210 };
211
212 #define BGP_CAPCODE_MP 1 /* RFC2858 */
213 #define BGP_CAPCODE_RR 2 /* RFC2918 */
214 #define BGP_CAPCODE_ORF 3 /* RFC5291 */
215 #define BGP_CAPCODE_MR 4 /* RFC3107 */
216 #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */
217 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */
218 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
219 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
220 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
221 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
222 #define BGP_CAPCODE_ENH_RR 70 /* draft-keyur-bgp-enhanced-route-refresh */
223 #define BGP_CAPCODE_RR_CISCO 128
224
225 static const struct tok bgp_capcode_values[] = {
226 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
227 { BGP_CAPCODE_RR, "Route Refresh"},
228 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
229 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
230 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
231 { BGP_CAPCODE_RESTART, "Graceful Restart"},
232 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
233 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
234 { BGP_CAPCODE_MULTISESS, "Multisession BGP"},
235 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
236 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
237 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
238 { 0, NULL}
239 };
240
241 #define BGP_NOTIFY_MAJOR_MSG 1
242 #define BGP_NOTIFY_MAJOR_OPEN 2
243 #define BGP_NOTIFY_MAJOR_UPDATE 3
244 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
245 #define BGP_NOTIFY_MAJOR_FSM 5
246 #define BGP_NOTIFY_MAJOR_CEASE 6
247 #define BGP_NOTIFY_MAJOR_CAP 7
248
249 static const struct tok bgp_notify_major_values[] = {
250 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
251 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
252 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
253 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
254 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
255 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
256 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"},
257 { 0, NULL}
258 };
259
260 /* draft-ietf-idr-cease-subcode-02 */
261 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
262 /* draft-ietf-idr-shutdown-07 */
263 #define BGP_NOTIFY_MINOR_CEASE_SHUT 2
264 #define BGP_NOTIFY_MINOR_CEASE_RESET 4
265 #define BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN 128
266 static const struct tok bgp_notify_minor_cease_values[] = {
267 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
268 { BGP_NOTIFY_MINOR_CEASE_SHUT, "Administrative Shutdown"},
269 { 3, "Peer Unconfigured"},
270 { BGP_NOTIFY_MINOR_CEASE_RESET, "Administrative Reset"},
271 { 5, "Connection Rejected"},
272 { 6, "Other Configuration Change"},
273 { 7, "Connection Collision Resolution"},
274 { 0, NULL}
275 };
276
277 static const struct tok bgp_notify_minor_msg_values[] = {
278 { 1, "Connection Not Synchronized"},
279 { 2, "Bad Message Length"},
280 { 3, "Bad Message Type"},
281 { 0, NULL}
282 };
283
284 static const struct tok bgp_notify_minor_open_values[] = {
285 { 1, "Unsupported Version Number"},
286 { 2, "Bad Peer AS"},
287 { 3, "Bad BGP Identifier"},
288 { 4, "Unsupported Optional Parameter"},
289 { 5, "Authentication Failure"},
290 { 6, "Unacceptable Hold Time"},
291 { 7, "Capability Message Error"},
292 { 0, NULL}
293 };
294
295 static const struct tok bgp_notify_minor_update_values[] = {
296 { 1, "Malformed Attribute List"},
297 { 2, "Unrecognized Well-known Attribute"},
298 { 3, "Missing Well-known Attribute"},
299 { 4, "Attribute Flags Error"},
300 { 5, "Attribute Length Error"},
301 { 6, "Invalid ORIGIN Attribute"},
302 { 7, "AS Routing Loop"},
303 { 8, "Invalid NEXT_HOP Attribute"},
304 { 9, "Optional Attribute Error"},
305 { 10, "Invalid Network Field"},
306 { 11, "Malformed AS_PATH"},
307 { 0, NULL}
308 };
309
310 static const struct tok bgp_notify_minor_fsm_values[] = {
311 { 0, "Unspecified Error"},
312 { 1, "In OpenSent State"},
313 { 2, "In OpenConfirm State"},
314 { 3, "In Established State"},
315 { 0, NULL }
316 };
317
318 static const struct tok bgp_notify_minor_cap_values[] = {
319 { 1, "Invalid Action Value" },
320 { 2, "Invalid Capability Length" },
321 { 3, "Malformed Capability Value" },
322 { 4, "Unsupported Capability Code" },
323 { 0, NULL }
324 };
325
326 static const struct tok bgp_origin_values[] = {
327 { 0, "IGP"},
328 { 1, "EGP"},
329 { 2, "Incomplete"},
330 { 0, NULL}
331 };
332
333 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1
334 #define BGP_PMSI_TUNNEL_LDP_P2MP 2
335 #define BGP_PMSI_TUNNEL_PIM_SSM 3
336 #define BGP_PMSI_TUNNEL_PIM_SM 4
337 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5
338 #define BGP_PMSI_TUNNEL_INGRESS 6
339 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7
340
341 static const struct tok bgp_pmsi_tunnel_values[] = {
342 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
343 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
344 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
345 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
346 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
347 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
348 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
349 { 0, NULL}
350 };
351
352 static const struct tok bgp_pmsi_flag_values[] = {
353 { 0x01, "Leaf Information required"},
354 { 0, NULL}
355 };
356
357 #define BGP_AIGP_TLV 1
358
359 static const struct tok bgp_aigp_values[] = {
360 { BGP_AIGP_TLV, "AIGP"},
361 { 0, NULL}
362 };
363
364 /* Subsequent address family identifier, RFC2283 section 7 */
365 #define SAFNUM_RES 0
366 #define SAFNUM_UNICAST 1
367 #define SAFNUM_MULTICAST 2
368 #define SAFNUM_UNIMULTICAST 3 /* deprecated now */
369 /* labeled BGP RFC3107 */
370 #define SAFNUM_LABUNICAST 4
371 /* RFC6514 */
372 #define SAFNUM_MULTICAST_VPN 5
373 /* draft-nalawade-kapoor-tunnel-safi */
374 #define SAFNUM_TUNNEL 64
375 /* RFC4761 */
376 #define SAFNUM_VPLS 65
377 /* RFC6037 */
378 #define SAFNUM_MDT 66
379 /* RFC4364 */
380 #define SAFNUM_VPNUNICAST 128
381 /* RFC6513 */
382 #define SAFNUM_VPNMULTICAST 129
383 #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */
384 /* RFC4684 */
385 #define SAFNUM_RT_ROUTING_INFO 132
386
387 #define BGP_VPN_RD_LEN 8
388
389 static const struct tok bgp_safi_values[] = {
390 { SAFNUM_RES, "Reserved"},
391 { SAFNUM_UNICAST, "Unicast"},
392 { SAFNUM_MULTICAST, "Multicast"},
393 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
394 { SAFNUM_LABUNICAST, "labeled Unicast"},
395 { SAFNUM_TUNNEL, "Tunnel"},
396 { SAFNUM_VPLS, "VPLS"},
397 { SAFNUM_MDT, "MDT"},
398 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
399 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
400 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
401 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
402 { SAFNUM_MULTICAST_VPN, "Multicast VPN"},
403 { 0, NULL }
404 };
405
406 /* well-known community */
407 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
408 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
409 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
410
411 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */
412 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
413 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
414 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
415 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
416 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
417 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
418 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
419 /* rfc2547 bgp-mpls-vpns */
420 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
421 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards 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(pptr[0]);
542 ITEMCHECK(1);
543 plen = pptr[0];
544 if (32 < plen)
545 return -1;
546 itemlen -= 1;
547
548 memset(&addr, 0, sizeof(addr));
549 plenbytes = (plen + 7) / 8;
550 ND_TCHECK2(pptr[1], plenbytes);
551 ITEMCHECK(plenbytes);
552 memcpy(&addr, &pptr[1], plenbytes);
553 if (plen % 8) {
554 ((u_char *)&addr)[plenbytes - 1] &=
555 ((0xff00 >> (plen % 8)) & 0xff);
556 }
557 snprintf(buf, buflen, "%s/%d", ipaddr_string(ndo, &addr), plen);
558 return 1 + plenbytes;
559
560 trunc:
561 return -2;
562
563 badtlv:
564 return -3;
565 }
566
567 static int
568 decode_labeled_prefix4(netdissect_options *ndo,
569 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
570 {
571 struct in_addr addr;
572 u_int plen, plenbytes;
573
574 /* prefix length and label = 4 bytes */
575 ND_TCHECK2(pptr[0], 4);
576 ITEMCHECK(4);
577 plen = pptr[0]; /* get prefix length */
578
579 /* this is one of the weirdnesses of rfc3107
580 the label length (actually the label + COS bits)
581 is added to the prefix length;
582 we also do only read out just one label -
583 there is no real application for advertisement of
584 stacked labels in a single BGP message
585 */
586
587 if (24 > plen)
588 return -1;
589
590 plen-=24; /* adjust prefixlen - labellength */
591
592 if (32 < plen)
593 return -1;
594 itemlen -= 4;
595
596 memset(&addr, 0, sizeof(addr));
597 plenbytes = (plen + 7) / 8;
598 ND_TCHECK2(pptr[4], plenbytes);
599 ITEMCHECK(plenbytes);
600 memcpy(&addr, &pptr[4], plenbytes);
601 if (plen % 8) {
602 ((u_char *)&addr)[plenbytes - 1] &=
603 ((0xff00 >> (plen % 8)) & 0xff);
604 }
605 /* the label may get offsetted by 4 bits so lets shift it right */
606 snprintf(buf, buflen, "%s/%d, label:%u %s",
607 ipaddr_string(ndo, &addr),
608 plen,
609 EXTRACT_24BITS(pptr+1)>>4,
610 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
611
612 return 4 + plenbytes;
613
614 trunc:
615 return -2;
616
617 badtlv:
618 return -3;
619 }
620
621 /*
622 * bgp_vpn_ip_print
623 *
624 * print an ipv4 or ipv6 address into a buffer dependend on address length.
625 */
626 static char *
627 bgp_vpn_ip_print(netdissect_options *ndo,
628 const u_char *pptr, u_int addr_length)
629 {
630
631 /* worst case string is s fully formatted v6 address */
632 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
633 char *pos = addr;
634
635 switch(addr_length) {
636 case (sizeof(struct in_addr) << 3): /* 32 */
637 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
638 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
639 break;
640 case (sizeof(struct in6_addr) << 3): /* 128 */
641 ND_TCHECK2(pptr[0], sizeof(struct in6_addr));
642 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
643 break;
644 default:
645 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
646 break;
647 }
648 pos += strlen(pos);
649
650 trunc:
651 *(pos) = '\0';
652 return (addr);
653 }
654
655 /*
656 * bgp_vpn_sg_print
657 *
658 * print an multicast s,g entry into a buffer.
659 * the s,g entry is encoded like this.
660 *
661 * +-----------------------------------+
662 * | Multicast Source Length (1 octet) |
663 * +-----------------------------------+
664 * | Multicast Source (Variable) |
665 * +-----------------------------------+
666 * | Multicast Group Length (1 octet) |
667 * +-----------------------------------+
668 * | Multicast Group (Variable) |
669 * +-----------------------------------+
670 *
671 * return the number of bytes read from the wire.
672 */
673 static int
674 bgp_vpn_sg_print(netdissect_options *ndo,
675 const u_char *pptr, char *buf, u_int buflen)
676 {
677 uint8_t addr_length;
678 u_int total_length, offset;
679
680 total_length = 0;
681
682 /* Source address length, encoded in bits */
683 ND_TCHECK2(pptr[0], 1);
684 addr_length = *pptr++;
685
686 /* Source address */
687 ND_TCHECK2(pptr[0], (addr_length >> 3));
688 total_length += (addr_length >> 3) + 1;
689 offset = strlen(buf);
690 if (addr_length) {
691 snprintf(buf + offset, buflen - offset, ", Source %s",
692 bgp_vpn_ip_print(ndo, pptr, addr_length));
693 pptr += (addr_length >> 3);
694 }
695
696 /* Group address length, encoded in bits */
697 ND_TCHECK2(pptr[0], 1);
698 addr_length = *pptr++;
699
700 /* Group address */
701 ND_TCHECK2(pptr[0], (addr_length >> 3));
702 total_length += (addr_length >> 3) + 1;
703 offset = strlen(buf);
704 if (addr_length) {
705 snprintf(buf + offset, buflen - offset, ", Group %s",
706 bgp_vpn_ip_print(ndo, pptr, addr_length));
707 pptr += (addr_length >> 3);
708 }
709
710 trunc:
711 return (total_length);
712 }
713
714 /* RDs and RTs share the same semantics
715 * we use bgp_vpn_rd_print for
716 * printing route targets inside a NLRI */
717 char *
718 bgp_vpn_rd_print(netdissect_options *ndo,
719 const u_char *pptr)
720 {
721 /* allocate space for the largest possible string */
722 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
723 char *pos = rd;
724
725 /* ok lets load the RD format */
726 switch (EXTRACT_16BITS(pptr)) {
727
728 /* 2-byte-AS:number fmt*/
729 case 0:
730 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
731 EXTRACT_16BITS(pptr+2),
732 EXTRACT_32BITS(pptr+4),
733 *(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7));
734 break;
735 /* IP-address:AS fmt*/
736
737 case 1:
738 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
739 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6));
740 break;
741
742 /* 4-byte-AS:number fmt*/
743 case 2:
744 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
745 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+2)),
746 EXTRACT_16BITS(pptr+6), *(pptr+2), *(pptr+3), *(pptr+4),
747 *(pptr+5), EXTRACT_16BITS(pptr+6));
748 break;
749 default:
750 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
751 break;
752 }
753 pos += strlen(pos);
754 *(pos) = '\0';
755 return (rd);
756 }
757
758 static int
759 decode_rt_routing_info(netdissect_options *ndo,
760 const u_char *pptr, char *buf, u_int buflen)
761 {
762 uint8_t route_target[8];
763 u_int plen;
764 char asbuf[sizeof(astostr)]; /* bgp_vpn_rd_print() overwrites astostr */
765
766 /* NLRI "prefix length" from RFC 2858 Section 4. */
767 ND_TCHECK(pptr[0]);
768 plen = pptr[0]; /* get prefix length */
769
770 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
771 * RFC 4684 Section 4 defines the layout of "origin AS" and "route
772 * target" fields inside the "prefix" depending on its length.
773 */
774 if (0 == plen) {
775 /* Without "origin AS", without "route target". */
776 snprintf(buf, buflen, "default route target");
777 return 1;
778 }
779
780 if (32 > plen)
781 return -1;
782
783 /* With at least "origin AS", possibly with "route target". */
784 ND_TCHECK_32BITS(pptr + 1);
785 as_printf(ndo, asbuf, sizeof(asbuf), EXTRACT_32BITS(pptr + 1));
786
787 plen-=32; /* adjust prefix length */
788
789 if (64 < plen)
790 return -1;
791
792 /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 }
793 * and gives the number of octets in the variable-length "route
794 * target" field inside this NLRI "prefix". Look for it.
795 */
796 memset(&route_target, 0, sizeof(route_target));
797 ND_TCHECK2(pptr[5], (plen + 7) / 8);
798 memcpy(&route_target, &pptr[5], (plen + 7) / 8);
799 /* Which specification says to do this? */
800 if (plen % 8) {
801 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
802 ((0xff00 >> (plen % 8)) & 0xff);
803 }
804 snprintf(buf, buflen, "origin AS: %s, route target %s",
805 asbuf,
806 bgp_vpn_rd_print(ndo, (u_char *)&route_target));
807
808 return 5 + (plen + 7) / 8;
809
810 trunc:
811 return -2;
812 }
813
814 static int
815 decode_labeled_vpn_prefix4(netdissect_options *ndo,
816 const u_char *pptr, char *buf, u_int buflen)
817 {
818 struct in_addr addr;
819 u_int plen;
820
821 ND_TCHECK(pptr[0]);
822 plen = pptr[0]; /* get prefix length */
823
824 if ((24+64) > plen)
825 return -1;
826
827 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
828
829 if (32 < plen)
830 return -1;
831
832 memset(&addr, 0, sizeof(addr));
833 ND_TCHECK2(pptr[12], (plen + 7) / 8);
834 memcpy(&addr, &pptr[12], (plen + 7) / 8);
835 if (plen % 8) {
836 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
837 ((0xff00 >> (plen % 8)) & 0xff);
838 }
839 /* the label may get offsetted by 4 bits so lets shift it right */
840 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
841 bgp_vpn_rd_print(ndo, pptr+4),
842 ipaddr_string(ndo, &addr),
843 plen,
844 EXTRACT_24BITS(pptr+1)>>4,
845 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
846
847 return 12 + (plen + 7) / 8;
848
849 trunc:
850 return -2;
851 }
852
853 /*
854 * +-------------------------------+
855 * | |
856 * | RD:IPv4-address (12 octets) |
857 * | |
858 * +-------------------------------+
859 * | MDT Group-address (4 octets) |
860 * +-------------------------------+
861 */
862
863 #define MDT_VPN_NLRI_LEN 16
864
865 static int
866 decode_mdt_vpn_nlri(netdissect_options *ndo,
867 const u_char *pptr, char *buf, u_int buflen)
868 {
869
870 const u_char *rd;
871 const u_char *vpn_ip;
872
873 ND_TCHECK(pptr[0]);
874
875 /* if the NLRI is not predefined length, quit.*/
876 if (*pptr != MDT_VPN_NLRI_LEN * 8)
877 return -1;
878 pptr++;
879
880 /* RD */
881 ND_TCHECK2(pptr[0], 8);
882 rd = pptr;
883 pptr+=8;
884
885 /* IPv4 address */
886 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
887 vpn_ip = pptr;
888 pptr+=sizeof(struct in_addr);
889
890 /* MDT Group Address */
891 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
892
893 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
894 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
895
896 return MDT_VPN_NLRI_LEN + 1;
897
898 trunc:
899
900 return -2;
901 }
902
903 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
904 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
905 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
906 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
907 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
908 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
909 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
910
911 static const struct tok bgp_multicast_vpn_route_type_values[] = {
912 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
913 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
914 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
915 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
916 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
917 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
918 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
919 { 0, NULL}
920 };
921
922 static int
923 decode_multicast_vpn(netdissect_options *ndo,
924 const u_char *pptr, char *buf, u_int buflen)
925 {
926 uint8_t route_type, route_length, addr_length, sg_length;
927 u_int offset;
928
929 ND_TCHECK2(pptr[0], 2);
930 route_type = *pptr++;
931 route_length = *pptr++;
932
933 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
934 tok2str(bgp_multicast_vpn_route_type_values,
935 "Unknown", route_type),
936 route_type, route_length);
937
938 switch(route_type) {
939 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
940 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
941 offset = strlen(buf);
942 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
943 bgp_vpn_rd_print(ndo, pptr),
944 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
945 (route_length - BGP_VPN_RD_LEN) << 3));
946 break;
947 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
948 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4);
949 offset = strlen(buf);
950 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
951 bgp_vpn_rd_print(ndo, pptr),
952 as_printf(ndo, astostr, sizeof(astostr),
953 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
954 break;
955
956 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
957 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
958 offset = strlen(buf);
959 snprintf(buf + offset, buflen - offset, ", RD: %s",
960 bgp_vpn_rd_print(ndo, pptr));
961 pptr += BGP_VPN_RD_LEN;
962
963 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
964 addr_length = route_length - sg_length;
965
966 ND_TCHECK2(pptr[0], addr_length);
967 offset = strlen(buf);
968 snprintf(buf + offset, buflen - offset, ", Originator %s",
969 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
970 break;
971
972 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
973 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
974 offset = strlen(buf);
975 snprintf(buf + offset, buflen - offset, ", RD: %s",
976 bgp_vpn_rd_print(ndo, pptr));
977 pptr += BGP_VPN_RD_LEN;
978
979 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
980 break;
981
982 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
983 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
984 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4);
985 offset = strlen(buf);
986 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
987 bgp_vpn_rd_print(ndo, pptr),
988 as_printf(ndo, astostr, sizeof(astostr),
989 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
990 pptr += BGP_VPN_RD_LEN + 4;
991
992 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
993 break;
994
995 /*
996 * no per route-type printing yet.
997 */
998 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
999 default:
1000 break;
1001 }
1002
1003 return route_length + 2;
1004
1005 trunc:
1006 return -2;
1007 }
1008
1009 /*
1010 * As I remember, some versions of systems have an snprintf() that
1011 * returns -1 if the buffer would have overflowed. If the return
1012 * value is negative, set buflen to 0, to indicate that we've filled
1013 * the buffer up.
1014 *
1015 * If the return value is greater than buflen, that means that
1016 * the buffer would have overflowed; again, set buflen to 0 in
1017 * that case.
1018 */
1019 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1020 if (stringlen<0) \
1021 buflen=0; \
1022 else if ((u_int)stringlen>buflen) \
1023 buflen=0; \
1024 else { \
1025 buflen-=stringlen; \
1026 buf+=stringlen; \
1027 }
1028
1029 static int
1030 decode_labeled_vpn_l2(netdissect_options *ndo,
1031 const u_char *pptr, char *buf, u_int buflen)
1032 {
1033 int plen,tlen,stringlen,tlv_type,tlv_len,ttlv_len;
1034
1035 ND_TCHECK2(pptr[0], 2);
1036 plen=EXTRACT_16BITS(pptr);
1037 tlen=plen;
1038 pptr+=2;
1039 /* Old and new L2VPN NLRI share AFI/SAFI
1040 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1041 * and > 17 as old format. Complain for the middle case
1042 */
1043 if (plen==12) {
1044 /* assume AD-only with RD, BGPNH */
1045 ND_TCHECK2(pptr[0],12);
1046 buf[0]='\0';
1047 stringlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1048 bgp_vpn_rd_print(ndo, pptr),
1049 ipaddr_string(ndo, pptr+8)
1050 );
1051 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1052 pptr+=12;
1053 tlen-=12;
1054 return plen;
1055 } else if (plen>17) {
1056 /* assume old format */
1057 /* RD, ID, LBLKOFF, LBLBASE */
1058
1059 ND_TCHECK2(pptr[0],15);
1060 buf[0]='\0';
1061 stringlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1062 bgp_vpn_rd_print(ndo, pptr),
1063 EXTRACT_16BITS(pptr+8),
1064 EXTRACT_16BITS(pptr+10),
1065 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1066 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1067 pptr+=15;
1068 tlen-=15;
1069
1070 /* ok now the variable part - lets read out TLVs*/
1071 while (tlen>0) {
1072 if (tlen < 3)
1073 return -1;
1074 ND_TCHECK2(pptr[0], 3);
1075 tlv_type=*pptr++;
1076 tlv_len=EXTRACT_16BITS(pptr);
1077 ttlv_len=tlv_len;
1078 pptr+=2;
1079
1080 switch(tlv_type) {
1081 case 1:
1082 if (buflen!=0) {
1083 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1084 tlv_type,
1085 tlv_len);
1086 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1087 }
1088 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
1089 while (ttlv_len>0) {
1090 ND_TCHECK(pptr[0]);
1091 if (buflen!=0) {
1092 stringlen=snprintf(buf,buflen, "%02x",*pptr++);
1093 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1094 }
1095 ttlv_len--;
1096 }
1097 break;
1098 default:
1099 if (buflen!=0) {
1100 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1101 tlv_type,
1102 tlv_len);
1103 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1104 }
1105 break;
1106 }
1107 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
1108 }
1109 return plen+2;
1110
1111 } else {
1112 /* complain bitterly ? */
1113 /* fall through */
1114 goto trunc;
1115 }
1116
1117 trunc:
1118 return -2;
1119 }
1120
1121 int
1122 decode_prefix6(netdissect_options *ndo,
1123 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1124 {
1125 struct in6_addr addr;
1126 u_int plen, plenbytes;
1127
1128 ND_TCHECK(pd[0]);
1129 ITEMCHECK(1);
1130 plen = pd[0];
1131 if (128 < plen)
1132 return -1;
1133 itemlen -= 1;
1134
1135 memset(&addr, 0, sizeof(addr));
1136 plenbytes = (plen + 7) / 8;
1137 ND_TCHECK2(pd[1], plenbytes);
1138 ITEMCHECK(plenbytes);
1139 memcpy(&addr, &pd[1], plenbytes);
1140 if (plen % 8) {
1141 addr.s6_addr[plenbytes - 1] &=
1142 ((0xff00 >> (plen % 8)) & 0xff);
1143 }
1144 snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen);
1145 return 1 + plenbytes;
1146
1147 trunc:
1148 return -2;
1149
1150 badtlv:
1151 return -3;
1152 }
1153
1154 static int
1155 decode_labeled_prefix6(netdissect_options *ndo,
1156 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1157 {
1158 struct in6_addr addr;
1159 u_int plen, plenbytes;
1160
1161 /* prefix length and label = 4 bytes */
1162 ND_TCHECK2(pptr[0], 4);
1163 ITEMCHECK(4);
1164 plen = pptr[0]; /* get prefix length */
1165
1166 if (24 > plen)
1167 return -1;
1168
1169 plen-=24; /* adjust prefixlen - labellength */
1170
1171 if (128 < plen)
1172 return -1;
1173 itemlen -= 4;
1174
1175 memset(&addr, 0, sizeof(addr));
1176 plenbytes = (plen + 7) / 8;
1177 ND_TCHECK2(pptr[4], plenbytes);
1178 memcpy(&addr, &pptr[4], plenbytes);
1179 if (plen % 8) {
1180 addr.s6_addr[plenbytes - 1] &=
1181 ((0xff00 >> (plen % 8)) & 0xff);
1182 }
1183 /* the label may get offsetted by 4 bits so lets shift it right */
1184 snprintf(buf, buflen, "%s/%d, label:%u %s",
1185 ip6addr_string(ndo, &addr),
1186 plen,
1187 EXTRACT_24BITS(pptr+1)>>4,
1188 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1189
1190 return 4 + plenbytes;
1191
1192 trunc:
1193 return -2;
1194
1195 badtlv:
1196 return -3;
1197 }
1198
1199 static int
1200 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1201 const u_char *pptr, char *buf, u_int buflen)
1202 {
1203 struct in6_addr addr;
1204 u_int plen;
1205
1206 ND_TCHECK(pptr[0]);
1207 plen = pptr[0]; /* get prefix length */
1208
1209 if ((24+64) > plen)
1210 return -1;
1211
1212 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1213
1214 if (128 < plen)
1215 return -1;
1216
1217 memset(&addr, 0, sizeof(addr));
1218 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1219 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1220 if (plen % 8) {
1221 addr.s6_addr[(plen + 7) / 8 - 1] &=
1222 ((0xff00 >> (plen % 8)) & 0xff);
1223 }
1224 /* the label may get offsetted by 4 bits so lets shift it right */
1225 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1226 bgp_vpn_rd_print(ndo, pptr+4),
1227 ip6addr_string(ndo, &addr),
1228 plen,
1229 EXTRACT_24BITS(pptr+1)>>4,
1230 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1231
1232 return 12 + (plen + 7) / 8;
1233
1234 trunc:
1235 return -2;
1236 }
1237
1238 static int
1239 decode_clnp_prefix(netdissect_options *ndo,
1240 const u_char *pptr, char *buf, u_int buflen)
1241 {
1242 uint8_t addr[19];
1243 u_int plen;
1244
1245 ND_TCHECK(pptr[0]);
1246 plen = pptr[0]; /* get prefix length */
1247
1248 if (152 < plen)
1249 return -1;
1250
1251 memset(&addr, 0, sizeof(addr));
1252 ND_TCHECK2(pptr[4], (plen + 7) / 8);
1253 memcpy(&addr, &pptr[4], (plen + 7) / 8);
1254 if (plen % 8) {
1255 addr[(plen + 7) / 8 - 1] &=
1256 ((0xff00 >> (plen % 8)) & 0xff);
1257 }
1258 snprintf(buf, buflen, "%s/%d",
1259 isonsap_string(ndo, addr,(plen + 7) / 8),
1260 plen);
1261
1262 return 1 + (plen + 7) / 8;
1263
1264 trunc:
1265 return -2;
1266 }
1267
1268 static int
1269 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1270 const u_char *pptr, char *buf, u_int buflen)
1271 {
1272 uint8_t addr[19];
1273 u_int plen;
1274
1275 ND_TCHECK(pptr[0]);
1276 plen = pptr[0]; /* get prefix length */
1277
1278 if ((24+64) > plen)
1279 return -1;
1280
1281 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1282
1283 if (152 < plen)
1284 return -1;
1285
1286 memset(&addr, 0, sizeof(addr));
1287 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1288 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1289 if (plen % 8) {
1290 addr[(plen + 7) / 8 - 1] &=
1291 ((0xff00 >> (plen % 8)) & 0xff);
1292 }
1293 /* the label may get offsetted by 4 bits so lets shift it right */
1294 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1295 bgp_vpn_rd_print(ndo, pptr+4),
1296 isonsap_string(ndo, addr,(plen + 7) / 8),
1297 plen,
1298 EXTRACT_24BITS(pptr+1)>>4,
1299 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1300
1301 return 12 + (plen + 7) / 8;
1302
1303 trunc:
1304 return -2;
1305 }
1306
1307 /*
1308 * bgp_attr_get_as_size
1309 *
1310 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1311 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1312 * support, exchange AS-Path with the same path-attribute type value 0x02.
1313 */
1314 static int
1315 bgp_attr_get_as_size(netdissect_options *ndo,
1316 uint8_t bgpa_type, const u_char *pptr, int len)
1317 {
1318 const u_char *tptr = pptr;
1319
1320 /*
1321 * If the path attribute is the optional AS4 path type, then we already
1322 * know, that ASs must be encoded in 4 byte format.
1323 */
1324 if (bgpa_type == BGPTYPE_AS4_PATH) {
1325 return 4;
1326 }
1327
1328 /*
1329 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1330 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1331 * each.
1332 */
1333 while (tptr < pptr + len) {
1334 ND_TCHECK(tptr[0]);
1335
1336 /*
1337 * If we do not find a valid segment type, our guess might be wrong.
1338 */
1339 if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) {
1340 goto trunc;
1341 }
1342 ND_TCHECK(tptr[1]);
1343 tptr += 2 + tptr[1] * 2;
1344 }
1345
1346 /*
1347 * If we correctly reached end of the AS path attribute data content,
1348 * then most likely ASs were indeed encoded as 2 bytes.
1349 */
1350 if (tptr == pptr + len) {
1351 return 2;
1352 }
1353
1354 trunc:
1355
1356 /*
1357 * We can come here, either we did not have enough data, or if we
1358 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1359 * so that calller can try to decode each AS as of 4 bytes. If indeed
1360 * there was not enough data, it will crib and end the parse anyways.
1361 */
1362 return 4;
1363 }
1364
1365 static int
1366 bgp_attr_print(netdissect_options *ndo,
1367 u_int atype, const u_char *pptr, u_int len)
1368 {
1369 int i;
1370 uint16_t af;
1371 uint8_t safi, snpa, nhlen;
1372 union { /* copy buffer for bandwidth values */
1373 float f;
1374 uint32_t i;
1375 } bw;
1376 int advance;
1377 u_int tlen;
1378 const u_char *tptr;
1379 char buf[MAXHOSTNAMELEN + 100];
1380 int as_size;
1381
1382 tptr = pptr;
1383 tlen=len;
1384
1385 switch (atype) {
1386 case BGPTYPE_ORIGIN:
1387 if (len != 1)
1388 ND_PRINT((ndo, "invalid len"));
1389 else {
1390 ND_TCHECK(*tptr);
1391 ND_PRINT((ndo, "%s", tok2str(bgp_origin_values,
1392 "Unknown Origin Typecode",
1393 tptr[0])));
1394 }
1395 break;
1396
1397 /*
1398 * Process AS4 byte path and AS2 byte path attributes here.
1399 */
1400 case BGPTYPE_AS4_PATH:
1401 case BGPTYPE_AS_PATH:
1402 if (len % 2) {
1403 ND_PRINT((ndo, "invalid len"));
1404 break;
1405 }
1406 if (!len) {
1407 ND_PRINT((ndo, "empty"));
1408 break;
1409 }
1410
1411 /*
1412 * BGP updates exchanged between New speakers that support 4
1413 * byte AS, ASs are always encoded in 4 bytes. There is no
1414 * definitive way to find this, just by the packet's
1415 * contents. So, check for packet's TLV's sanity assuming
1416 * 2 bytes first, and it does not pass, assume that ASs are
1417 * encoded in 4 bytes format and move on.
1418 */
1419 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1420
1421 while (tptr < pptr + len) {
1422 ND_TCHECK(tptr[0]);
1423 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values,
1424 "?", tptr[0])));
1425 ND_TCHECK(tptr[1]);
1426 for (i = 0; i < tptr[1] * as_size; i += as_size) {
1427 ND_TCHECK2(tptr[2 + i], as_size);
1428 ND_PRINT((ndo, "%s ",
1429 as_printf(ndo, astostr, sizeof(astostr),
1430 as_size == 2 ?
1431 EXTRACT_16BITS(&tptr[2 + i]) :
1432 EXTRACT_32BITS(&tptr[2 + i]))));
1433 }
1434 ND_TCHECK(tptr[0]);
1435 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values,
1436 "?", tptr[0])));
1437 ND_TCHECK(tptr[1]);
1438 tptr += 2 + tptr[1] * as_size;
1439 }
1440 break;
1441 case BGPTYPE_NEXT_HOP:
1442 if (len != 4)
1443 ND_PRINT((ndo, "invalid len"));
1444 else {
1445 ND_TCHECK2(tptr[0], 4);
1446 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1447 }
1448 break;
1449 case BGPTYPE_MULTI_EXIT_DISC:
1450 case BGPTYPE_LOCAL_PREF:
1451 if (len != 4)
1452 ND_PRINT((ndo, "invalid len"));
1453 else {
1454 ND_TCHECK2(tptr[0], 4);
1455 ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr)));
1456 }
1457 break;
1458 case BGPTYPE_ATOMIC_AGGREGATE:
1459 if (len != 0)
1460 ND_PRINT((ndo, "invalid len"));
1461 break;
1462 case BGPTYPE_AGGREGATOR:
1463
1464 /*
1465 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1466 * the length of this PA can be either 6 bytes or 8 bytes.
1467 */
1468 if (len != 6 && len != 8) {
1469 ND_PRINT((ndo, "invalid len"));
1470 break;
1471 }
1472 ND_TCHECK2(tptr[0], len);
1473 if (len == 6) {
1474 ND_PRINT((ndo, " AS #%s, origin %s",
1475 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)),
1476 ipaddr_string(ndo, tptr + 2)));
1477 } else {
1478 ND_PRINT((ndo, " AS #%s, origin %s",
1479 as_printf(ndo, astostr, sizeof(astostr),
1480 EXTRACT_32BITS(tptr)), ipaddr_string(ndo, tptr + 4)));
1481 }
1482 break;
1483 case BGPTYPE_AGGREGATOR4:
1484 if (len != 8) {
1485 ND_PRINT((ndo, "invalid len"));
1486 break;
1487 }
1488 ND_TCHECK2(tptr[0], 8);
1489 ND_PRINT((ndo, " AS #%s, origin %s",
1490 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)),
1491 ipaddr_string(ndo, tptr + 4)));
1492 break;
1493 case BGPTYPE_COMMUNITIES:
1494 if (len % 4) {
1495 ND_PRINT((ndo, "invalid len"));
1496 break;
1497 }
1498 while (tlen>0) {
1499 uint32_t comm;
1500 ND_TCHECK2(tptr[0], 4);
1501 comm = EXTRACT_32BITS(tptr);
1502 switch (comm) {
1503 case BGP_COMMUNITY_NO_EXPORT:
1504 ND_PRINT((ndo, " NO_EXPORT"));
1505 break;
1506 case BGP_COMMUNITY_NO_ADVERT:
1507 ND_PRINT((ndo, " NO_ADVERTISE"));
1508 break;
1509 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1510 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1511 break;
1512 default:
1513 ND_PRINT((ndo, "%u:%u%s",
1514 (comm >> 16) & 0xffff,
1515 comm & 0xffff,
1516 (tlen>4) ? ", " : ""));
1517 break;
1518 }
1519 tlen -=4;
1520 tptr +=4;
1521 }
1522 break;
1523 case BGPTYPE_ORIGINATOR_ID:
1524 if (len != 4) {
1525 ND_PRINT((ndo, "invalid len"));
1526 break;
1527 }
1528 ND_TCHECK2(tptr[0], 4);
1529 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1530 break;
1531 case BGPTYPE_CLUSTER_LIST:
1532 if (len % 4) {
1533 ND_PRINT((ndo, "invalid len"));
1534 break;
1535 }
1536 while (tlen>0) {
1537 ND_TCHECK2(tptr[0], 4);
1538 ND_PRINT((ndo, "%s%s",
1539 ipaddr_string(ndo, tptr),
1540 (tlen>4) ? ", " : ""));
1541 tlen -=4;
1542 tptr +=4;
1543 }
1544 break;
1545 case BGPTYPE_MP_REACH_NLRI:
1546 ND_TCHECK2(tptr[0], 3);
1547 af = EXTRACT_16BITS(tptr);
1548 safi = tptr[2];
1549
1550 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1551 tok2str(af_values, "Unknown AFI", af),
1552 af,
1553 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1554 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1555 safi));
1556
1557 switch(af<<8 | safi) {
1558 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1559 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1560 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1561 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1562 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1563 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1564 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1565 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1566 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1567 case (AFNUM_INET<<8 | SAFNUM_MDT):
1568 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1569 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1570 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1571 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1572 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1573 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1574 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1575 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1576 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1577 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1578 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1579 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1580 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1581 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1582 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1583 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1584 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1585 break;
1586 default:
1587 ND_TCHECK2(tptr[0], tlen);
1588 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1589 if (ndo->ndo_vflag <= 1)
1590 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1591 goto done;
1592 break;
1593 }
1594
1595 tptr +=3;
1596
1597 ND_TCHECK(tptr[0]);
1598 nhlen = tptr[0];
1599 tlen = nhlen;
1600 tptr++;
1601
1602 if (tlen) {
1603 int nnh = 0;
1604 ND_PRINT((ndo, "\n\t nexthop: "));
1605 while (tlen > 0) {
1606 if ( nnh++ > 0 ) {
1607 ND_PRINT((ndo, ", " ));
1608 }
1609 switch(af<<8 | safi) {
1610 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1611 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1612 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1613 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1614 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1615 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1616 case (AFNUM_INET<<8 | SAFNUM_MDT):
1617 if (tlen < (int)sizeof(struct in_addr)) {
1618 ND_PRINT((ndo, "invalid len"));
1619 tlen = 0;
1620 } else {
1621 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1622 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1623 tlen -= sizeof(struct in_addr);
1624 tptr += sizeof(struct in_addr);
1625 }
1626 break;
1627 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1628 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1629 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1630 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) {
1631 ND_PRINT((ndo, "invalid len"));
1632 tlen = 0;
1633 } else {
1634 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1635 ND_PRINT((ndo, "RD: %s, %s",
1636 bgp_vpn_rd_print(ndo, tptr),
1637 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1638 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1639 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1640 }
1641 break;
1642 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1643 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1644 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1645 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1646 if (tlen < (int)sizeof(struct in6_addr)) {
1647 ND_PRINT((ndo, "invalid len"));
1648 tlen = 0;
1649 } else {
1650 ND_TCHECK2(tptr[0], sizeof(struct in6_addr));
1651 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr)));
1652 tlen -= sizeof(struct in6_addr);
1653 tptr += sizeof(struct in6_addr);
1654 }
1655 break;
1656 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1657 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1658 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1659 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) {
1660 ND_PRINT((ndo, "invalid len"));
1661 tlen = 0;
1662 } else {
1663 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1664 ND_PRINT((ndo, "RD: %s, %s",
1665 bgp_vpn_rd_print(ndo, tptr),
1666 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1667 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1668 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1669 }
1670 break;
1671 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1672 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1673 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1674 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1675 if (tlen < (int)sizeof(struct in_addr)) {
1676 ND_PRINT((ndo, "invalid len"));
1677 tlen = 0;
1678 } else {
1679 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1680 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1681 tlen -= (sizeof(struct in_addr));
1682 tptr += (sizeof(struct in_addr));
1683 }
1684 break;
1685 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1686 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1687 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1688 ND_TCHECK2(tptr[0], tlen);
1689 ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen)));
1690 tptr += tlen;
1691 tlen = 0;
1692 break;
1693
1694 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1695 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1696 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1697 if (tlen < BGP_VPN_RD_LEN+1) {
1698 ND_PRINT((ndo, "invalid len"));
1699 tlen = 0;
1700 } else {
1701 ND_TCHECK2(tptr[0], tlen);
1702 ND_PRINT((ndo, "RD: %s, %s",
1703 bgp_vpn_rd_print(ndo, tptr),
1704 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1705 /* rfc986 mapped IPv4 address ? */
1706 if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601)
1707 ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4)));
1708 /* rfc1888 mapped IPv6 address ? */
1709 else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000)
1710 ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3)));
1711 tptr += tlen;
1712 tlen = 0;
1713 }
1714 break;
1715 default:
1716 ND_TCHECK2(tptr[0], tlen);
1717 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1718 if (ndo->ndo_vflag <= 1)
1719 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1720 tptr += tlen;
1721 tlen = 0;
1722 goto done;
1723 break;
1724 }
1725 }
1726 }
1727 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1728 tptr += tlen;
1729
1730 ND_TCHECK(tptr[0]);
1731 snpa = tptr[0];
1732 tptr++;
1733
1734 if (snpa) {
1735 ND_PRINT((ndo, "\n\t %u SNPA", snpa));
1736 for (/*nothing*/; snpa > 0; snpa--) {
1737 ND_TCHECK(tptr[0]);
1738 ND_PRINT((ndo, "\n\t %d bytes", tptr[0]));
1739 tptr += tptr[0] + 1;
1740 }
1741 } else {
1742 ND_PRINT((ndo, ", no SNPA"));
1743 }
1744
1745 while (tptr < pptr + len) {
1746 switch (af<<8 | safi) {
1747 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1748 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1749 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1750 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1751 if (advance == -1)
1752 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1753 else if (advance == -2)
1754 goto trunc;
1755 else if (advance == -3)
1756 break; /* bytes left, but not enough */
1757 else
1758 ND_PRINT((ndo, "\n\t %s", buf));
1759 break;
1760 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1761 advance = decode_labeled_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_VPNUNICAST):
1772 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1773 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1774 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1775 if (advance == -1)
1776 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1777 else if (advance == -2)
1778 goto trunc;
1779 else
1780 ND_PRINT((ndo, "\n\t %s", buf));
1781 break;
1782 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1783 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf));
1784 if (advance == -1)
1785 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1786 else if (advance == -2)
1787 goto trunc;
1788 else
1789 ND_PRINT((ndo, "\n\t %s", buf));
1790 break;
1791 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1792 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1793 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1794 if (advance == -1)
1795 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1796 else if (advance == -2)
1797 goto trunc;
1798 else
1799 ND_PRINT((ndo, "\n\t %s", buf));
1800 break;
1801
1802 case (AFNUM_INET<<8 | SAFNUM_MDT):
1803 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1804 if (advance == -1)
1805 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1806 else if (advance == -2)
1807 goto trunc;
1808 else
1809 ND_PRINT((ndo, "\n\t %s", buf));
1810 break;
1811 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1812 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1813 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1814 advance = decode_prefix6(ndo, tptr, len, 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 if (advance == -3)
1820 break; /* bytes left, but not enough */
1821 else
1822 ND_PRINT((ndo, "\n\t %s", buf));
1823 break;
1824 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1825 advance = decode_labeled_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_VPNUNICAST):
1836 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1837 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1838 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1839 if (advance == -1)
1840 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1841 else if (advance == -2)
1842 goto trunc;
1843 else
1844 ND_PRINT((ndo, "\n\t %s", buf));
1845 break;
1846 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1847 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1848 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1849 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1850 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1851 if (advance == -1)
1852 ND_PRINT((ndo, "\n\t (illegal length)"));
1853 else if (advance == -2)
1854 goto trunc;
1855 else
1856 ND_PRINT((ndo, "\n\t %s", buf));
1857 break;
1858 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1859 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1860 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1861 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1862 if (advance == -1)
1863 ND_PRINT((ndo, "\n\t (illegal prefix 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_VPNUNICAST):
1870 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1871 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1872 advance = decode_labeled_vpn_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 default:
1881 ND_TCHECK2(*tptr,tlen);
1882 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1883 if (ndo->ndo_vflag <= 1)
1884 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1885 advance = 0;
1886 tptr = pptr + len;
1887 break;
1888 }
1889 if (advance < 0)
1890 break;
1891 tptr += advance;
1892 }
1893 done:
1894 break;
1895
1896 case BGPTYPE_MP_UNREACH_NLRI:
1897 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE);
1898 af = EXTRACT_16BITS(tptr);
1899 safi = tptr[2];
1900
1901 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1902 tok2str(af_values, "Unknown AFI", af),
1903 af,
1904 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1905 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1906 safi));
1907
1908 if (len == BGP_MP_NLRI_MINSIZE)
1909 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
1910
1911 tptr += 3;
1912
1913 while (tptr < pptr + len) {
1914 switch (af<<8 | safi) {
1915 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1916 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1917 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1918 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1919 if (advance == -1)
1920 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1921 else if (advance == -2)
1922 goto trunc;
1923 else if (advance == -3)
1924 break; /* bytes left, but not enough */
1925 else
1926 ND_PRINT((ndo, "\n\t %s", buf));
1927 break;
1928 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1929 advance = decode_labeled_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_VPNUNICAST):
1940 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1941 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1942 advance = decode_labeled_vpn_prefix4(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_INET6<<8 | SAFNUM_UNICAST):
1951 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1952 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1953 advance = decode_prefix6(ndo, tptr, len, 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 if (advance == -3)
1959 break; /* bytes left, but not enough */
1960 else
1961 ND_PRINT((ndo, "\n\t %s", buf));
1962 break;
1963 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1964 advance = decode_labeled_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_VPNUNICAST):
1975 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1976 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1977 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1978 if (advance == -1)
1979 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1980 else if (advance == -2)
1981 goto trunc;
1982 else
1983 ND_PRINT((ndo, "\n\t %s", buf));
1984 break;
1985 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1986 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1987 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1988 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1989 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1990 if (advance == -1)
1991 ND_PRINT((ndo, "\n\t (illegal length)"));
1992 else if (advance == -2)
1993 goto trunc;
1994 else
1995 ND_PRINT((ndo, "\n\t %s", buf));
1996 break;
1997 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1998 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1999 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
2000 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2001 if (advance == -1)
2002 ND_PRINT((ndo, "\n\t (illegal prefix 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_VPNUNICAST):
2009 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2010 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2011 advance = decode_labeled_vpn_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_INET<<8 | SAFNUM_MDT):
2020 advance = decode_mdt_vpn_nlri(ndo, tptr, 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
2026 ND_PRINT((ndo, "\n\t %s", buf));
2027 break;
2028 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
2029 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
2030 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
2031 if (advance == -1)
2032 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2033 else if (advance == -2)
2034 goto trunc;
2035 else
2036 ND_PRINT((ndo, "\n\t %s", buf));
2037 break;
2038 default:
2039 ND_TCHECK2(*(tptr-3),tlen);
2040 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
2041 if (ndo->ndo_vflag <= 1)
2042 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
2043 advance = 0;
2044 tptr = pptr + len;
2045 break;
2046 }
2047 if (advance < 0)
2048 break;
2049 tptr += advance;
2050 }
2051 break;
2052 case BGPTYPE_EXTD_COMMUNITIES:
2053 if (len % 8) {
2054 ND_PRINT((ndo, "invalid len"));
2055 break;
2056 }
2057 while (tlen>0) {
2058 uint16_t extd_comm;
2059
2060 ND_TCHECK2(tptr[0], 2);
2061 extd_comm=EXTRACT_16BITS(tptr);
2062
2063 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]",
2064 tok2str(bgp_extd_comm_subtype_values,
2065 "unknown extd community typecode",
2066 extd_comm),
2067 extd_comm,
2068 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2069
2070 ND_TCHECK2(*(tptr+2), 6);
2071 switch(extd_comm) {
2072 case BGP_EXT_COM_RT_0:
2073 case BGP_EXT_COM_RO_0:
2074 case BGP_EXT_COM_L2VPN_RT_0:
2075 ND_PRINT((ndo, ": %u:%u (= %s)",
2076 EXTRACT_16BITS(tptr+2),
2077 EXTRACT_32BITS(tptr+4),
2078 ipaddr_string(ndo, tptr+4)));
2079 break;
2080 case BGP_EXT_COM_RT_1:
2081 case BGP_EXT_COM_RO_1:
2082 case BGP_EXT_COM_L2VPN_RT_1:
2083 case BGP_EXT_COM_VRF_RT_IMP:
2084 ND_PRINT((ndo, ": %s:%u",
2085 ipaddr_string(ndo, tptr+2),
2086 EXTRACT_16BITS(tptr+6)));
2087 break;
2088 case BGP_EXT_COM_RT_2:
2089 case BGP_EXT_COM_RO_2:
2090 ND_PRINT((ndo, ": %s:%u",
2091 as_printf(ndo, astostr, sizeof(astostr),
2092 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6)));
2093 break;
2094 case BGP_EXT_COM_LINKBAND:
2095 bw.i = EXTRACT_32BITS(tptr+2);
2096 ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2097 bw.f*8/1000000));
2098 break;
2099 case BGP_EXT_COM_VPN_ORIGIN:
2100 case BGP_EXT_COM_VPN_ORIGIN2:
2101 case BGP_EXT_COM_VPN_ORIGIN3:
2102 case BGP_EXT_COM_VPN_ORIGIN4:
2103 case BGP_EXT_COM_OSPF_RID:
2104 case BGP_EXT_COM_OSPF_RID2:
2105 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2)));
2106 break;
2107 case BGP_EXT_COM_OSPF_RTYPE:
2108 case BGP_EXT_COM_OSPF_RTYPE2:
2109 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2110 ipaddr_string(ndo, tptr+2),
2111 tok2str(bgp_extd_comm_ospf_rtype_values,
2112 "unknown (0x%02x)",
2113 *(tptr+6)),
2114 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2115 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2116 break;
2117 case BGP_EXT_COM_L2INFO:
2118 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2119 tok2str(l2vpn_encaps_values,
2120 "unknown encaps",
2121 *(tptr+2)),
2122 *(tptr+3),
2123 EXTRACT_16BITS(tptr+4)));
2124 break;
2125 case BGP_EXT_COM_SOURCE_AS:
2126 ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2)));
2127 break;
2128 default:
2129 ND_TCHECK2(*tptr,8);
2130 print_unknown_data(ndo, tptr, "\n\t ", 8);
2131 break;
2132 }
2133 tlen -=8;
2134 tptr +=8;
2135 }
2136 break;
2137
2138 case BGPTYPE_PMSI_TUNNEL:
2139 {
2140 uint8_t tunnel_type, flags;
2141
2142 ND_TCHECK2(tptr[0], 5);
2143 tunnel_type = *(tptr+1);
2144 flags = *tptr;
2145 tlen = len;
2146
2147 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2148 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2149 tunnel_type,
2150 bittok2str(bgp_pmsi_flag_values, "none", flags),
2151 EXTRACT_24BITS(tptr+2)>>4));
2152
2153 tptr +=5;
2154 tlen -= 5;
2155
2156 switch (tunnel_type) {
2157 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2158 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2159 ND_TCHECK2(tptr[0], 8);
2160 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s",
2161 ipaddr_string(ndo, tptr),
2162 ipaddr_string(ndo, tptr+4)));
2163 break;
2164
2165 case BGP_PMSI_TUNNEL_PIM_SSM:
2166 ND_TCHECK2(tptr[0], 8);
2167 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s",
2168 ipaddr_string(ndo, tptr),
2169 ipaddr_string(ndo, tptr+4)));
2170 break;
2171 case BGP_PMSI_TUNNEL_INGRESS:
2172 ND_TCHECK2(tptr[0], 4);
2173 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s",
2174 ipaddr_string(ndo, tptr)));
2175 break;
2176 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2177 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2178 ND_TCHECK2(tptr[0], 8);
2179 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x",
2180 ipaddr_string(ndo, tptr),
2181 EXTRACT_32BITS(tptr+4)));
2182 break;
2183 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2184 ND_TCHECK2(tptr[0], 8);
2185 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2186 ipaddr_string(ndo, tptr),
2187 EXTRACT_32BITS(tptr+4)));
2188 break;
2189 default:
2190 if (ndo->ndo_vflag <= 1) {
2191 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2192 }
2193 }
2194 break;
2195 }
2196 case BGPTYPE_AIGP:
2197 {
2198 uint8_t type;
2199 uint16_t length;
2200
2201 tlen = len;
2202
2203 while (tlen >= 3) {
2204
2205 ND_TCHECK2(tptr[0], 3);
2206
2207 type = *tptr;
2208 length = EXTRACT_16BITS(tptr+1);
2209 tptr += 3;
2210 tlen -= 3;
2211
2212 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u",
2213 tok2str(bgp_aigp_values, "Unknown", type),
2214 type, length));
2215
2216 if (length < 3)
2217 goto trunc;
2218 length -= 3;
2219
2220 /*
2221 * Check if we can read the TLV data.
2222 */
2223 ND_TCHECK2(tptr[3], length);
2224
2225 switch (type) {
2226
2227 case BGP_AIGP_TLV:
2228 if (length < 8)
2229 goto trunc;
2230 ND_PRINT((ndo, ", metric %" PRIu64,
2231 EXTRACT_64BITS(tptr)));
2232 break;
2233
2234 default:
2235 if (ndo->ndo_vflag <= 1) {
2236 print_unknown_data(ndo, tptr,"\n\t ", length);
2237 }
2238 }
2239
2240 tptr += length;
2241 tlen -= length;
2242 }
2243 break;
2244 }
2245 case BGPTYPE_ATTR_SET:
2246 ND_TCHECK2(tptr[0], 4);
2247 if (len < 4)
2248 goto trunc;
2249 ND_PRINT((ndo, "\n\t Origin AS: %s",
2250 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr))));
2251 tptr+=4;
2252 len -=4;
2253
2254 while (len) {
2255 u_int aflags, alenlen, alen;
2256
2257 ND_TCHECK2(tptr[0], 2);
2258 if (len < 2)
2259 goto trunc;
2260 aflags = *tptr;
2261 atype = *(tptr + 1);
2262 tptr += 2;
2263 len -= 2;
2264 alenlen = bgp_attr_lenlen(aflags, tptr);
2265 ND_TCHECK2(tptr[0], alenlen);
2266 if (len < alenlen)
2267 goto trunc;
2268 alen = bgp_attr_len(aflags, tptr);
2269 tptr += alenlen;
2270 len -= alenlen;
2271
2272 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2273 tok2str(bgp_attr_values,
2274 "Unknown Attribute", atype),
2275 atype,
2276 alen));
2277
2278 if (aflags) {
2279 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2280 aflags & 0x80 ? "O" : "",
2281 aflags & 0x40 ? "T" : "",
2282 aflags & 0x20 ? "P" : "",
2283 aflags & 0x10 ? "E" : ""));
2284 if (aflags & 0xf)
2285 ND_PRINT((ndo, "+%x", aflags & 0xf));
2286 ND_PRINT((ndo, "]: "));
2287 }
2288 /* FIXME check for recursion */
2289 if (!bgp_attr_print(ndo, atype, tptr, alen))
2290 return 0;
2291 tptr += alen;
2292 len -= alen;
2293 }
2294 break;
2295
2296 case BGPTYPE_LARGE_COMMUNITY:
2297 if (len == 0 || len % 12) {
2298 ND_PRINT((ndo, "invalid len"));
2299 break;
2300 }
2301 ND_PRINT((ndo, "\n\t "));
2302 while (len > 0) {
2303 ND_TCHECK2(*tptr, 12);
2304 ND_PRINT((ndo, "%u:%u:%u%s",
2305 EXTRACT_32BITS(tptr),
2306 EXTRACT_32BITS(tptr + 4),
2307 EXTRACT_32BITS(tptr + 8),
2308 (len > 12) ? ", " : ""));
2309 tptr += 12;
2310 len -= 12;
2311 }
2312 break;
2313 default:
2314 ND_TCHECK2(*pptr,len);
2315 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2316 if (ndo->ndo_vflag <= 1)
2317 print_unknown_data(ndo, pptr, "\n\t ", len);
2318 break;
2319 }
2320 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2321 ND_TCHECK2(*pptr,len);
2322 print_unknown_data(ndo, pptr, "\n\t ", len);
2323 }
2324 return 1;
2325
2326 trunc:
2327 return 0;
2328 }
2329
2330 static void
2331 bgp_capabilities_print(netdissect_options *ndo,
2332 const u_char *opt, int caps_len)
2333 {
2334 int cap_type, cap_len, tcap_len, cap_offset;
2335 int i = 0;
2336
2337 while (i < caps_len) {
2338 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE);
2339 cap_type=opt[i];
2340 cap_len=opt[i+1];
2341 tcap_len=cap_len;
2342 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2343 tok2str(bgp_capcode_values, "Unknown",
2344 cap_type),
2345 cap_type,
2346 cap_len));
2347 ND_TCHECK2(opt[i+2], cap_len);
2348 switch (cap_type) {
2349 case BGP_CAPCODE_MP:
2350 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2351 tok2str(af_values, "Unknown",
2352 EXTRACT_16BITS(opt+i+2)),
2353 EXTRACT_16BITS(opt+i+2),
2354 tok2str(bgp_safi_values, "Unknown",
2355 opt[i+5]),
2356 opt[i+5]));
2357 break;
2358 case BGP_CAPCODE_RESTART:
2359 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2360 ((opt[i+2])&0x80) ? "R" : "none",
2361 EXTRACT_16BITS(opt+i+2)&0xfff));
2362 tcap_len-=2;
2363 cap_offset=4;
2364 while(tcap_len>=4) {
2365 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2366 tok2str(af_values,"Unknown",
2367 EXTRACT_16BITS(opt+i+cap_offset)),
2368 EXTRACT_16BITS(opt+i+cap_offset),
2369 tok2str(bgp_safi_values,"Unknown",
2370 opt[i+cap_offset+2]),
2371 opt[i+cap_offset+2],
2372 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" ));
2373 tcap_len-=4;
2374 cap_offset+=4;
2375 }
2376 break;
2377 case BGP_CAPCODE_RR:
2378 case BGP_CAPCODE_RR_CISCO:
2379 break;
2380 case BGP_CAPCODE_AS_NEW:
2381
2382 /*
2383 * Extract the 4 byte AS number encoded.
2384 */
2385 if (cap_len == 4) {
2386 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2387 as_printf(ndo, astostr, sizeof(astostr),
2388 EXTRACT_32BITS(opt + i + 2))));
2389 }
2390 break;
2391 case BGP_CAPCODE_ADD_PATH:
2392 cap_offset=2;
2393 if (tcap_len == 0) {
2394 ND_PRINT((ndo, " (bogus)")); /* length */
2395 break;
2396 }
2397 while (tcap_len > 0) {
2398 if (tcap_len < 4) {
2399 ND_PRINT((ndo, "\n\t\t(invalid)"));
2400 break;
2401 }
2402 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2403 tok2str(af_values,"Unknown",EXTRACT_16BITS(opt+i+cap_offset)),
2404 EXTRACT_16BITS(opt+i+cap_offset),
2405 tok2str(bgp_safi_values,"Unknown",opt[i+cap_offset+2]),
2406 opt[i+cap_offset+2],
2407 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",opt[i+cap_offset+3])
2408 ));
2409 tcap_len-=4;
2410 cap_offset+=4;
2411 }
2412 break;
2413 default:
2414 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2415 cap_type));
2416 if (ndo->ndo_vflag <= 1)
2417 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2418 break;
2419 }
2420 if (ndo->ndo_vflag > 1 && cap_len > 0) {
2421 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2422 }
2423 i += BGP_CAP_HEADER_SIZE + cap_len;
2424 }
2425 return;
2426
2427 trunc:
2428 ND_PRINT((ndo, "[|BGP]"));
2429 }
2430
2431 static void
2432 bgp_open_print(netdissect_options *ndo,
2433 const u_char *dat, int length)
2434 {
2435 struct bgp_open bgpo;
2436 struct bgp_opt bgpopt;
2437 const u_char *opt;
2438 int i;
2439
2440 ND_TCHECK2(dat[0], BGP_OPEN_SIZE);
2441 memcpy(&bgpo, dat, BGP_OPEN_SIZE);
2442
2443 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version));
2444 ND_PRINT((ndo, "my AS %s, ",
2445 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas))));
2446 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime)));
2447 ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgpo.bgpo_id)));
2448 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen));
2449
2450 /* some little sanity checking */
2451 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE)
2452 return;
2453
2454 /* ugly! */
2455 opt = &((const struct bgp_open *)dat)->bgpo_optlen;
2456 opt++;
2457
2458 i = 0;
2459 while (i < bgpo.bgpo_optlen) {
2460 ND_TCHECK2(opt[i], BGP_OPT_SIZE);
2461 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE);
2462 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
2463 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len));
2464 break;
2465 }
2466
2467 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u",
2468 tok2str(bgp_opt_values,"Unknown",
2469 bgpopt.bgpopt_type),
2470 bgpopt.bgpopt_type,
2471 bgpopt.bgpopt_len));
2472
2473 /* now let's decode the options we know*/
2474 switch(bgpopt.bgpopt_type) {
2475
2476 case BGP_OPT_CAP:
2477 bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE],
2478 bgpopt.bgpopt_len);
2479 break;
2480
2481 case BGP_OPT_AUTH:
2482 default:
2483 ND_PRINT((ndo, "\n\t no decoder for option %u",
2484 bgpopt.bgpopt_type));
2485 break;
2486 }
2487 i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
2488 }
2489 return;
2490 trunc:
2491 ND_PRINT((ndo, "[|BGP]"));
2492 }
2493
2494 static void
2495 bgp_update_print(netdissect_options *ndo,
2496 const u_char *dat, int length)
2497 {
2498 struct bgp bgp;
2499 const u_char *p;
2500 int withdrawn_routes_len;
2501 int len;
2502 int i;
2503
2504 ND_TCHECK2(dat[0], BGP_SIZE);
2505 if (length < BGP_SIZE)
2506 goto trunc;
2507 memcpy(&bgp, dat, BGP_SIZE);
2508 p = dat + BGP_SIZE; /*XXX*/
2509 length -= BGP_SIZE;
2510
2511 /* Unfeasible routes */
2512 ND_TCHECK2(p[0], 2);
2513 if (length < 2)
2514 goto trunc;
2515 withdrawn_routes_len = EXTRACT_16BITS(p);
2516 p += 2;
2517 length -= 2;
2518 if (withdrawn_routes_len) {
2519 /*
2520 * Without keeping state from the original NLRI message,
2521 * it's not possible to tell if this a v4 or v6 route,
2522 * so only try to decode it if we're not v6 enabled.
2523 */
2524 ND_TCHECK2(p[0], withdrawn_routes_len);
2525 if (length < withdrawn_routes_len)
2526 goto trunc;
2527 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len));
2528 p += withdrawn_routes_len;
2529 length -= withdrawn_routes_len;
2530 }
2531
2532 ND_TCHECK2(p[0], 2);
2533 if (length < 2)
2534 goto trunc;
2535 len = EXTRACT_16BITS(p);
2536 p += 2;
2537 length -= 2;
2538
2539 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2540 /* No withdrawn routes, no path attributes, no NLRI */
2541 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2542 return;
2543 }
2544
2545 if (len) {
2546 /* do something more useful!*/
2547 while (len) {
2548 int aflags, atype, alenlen, alen;
2549
2550 ND_TCHECK2(p[0], 2);
2551 if (len < 2)
2552 goto trunc;
2553 if (length < 2)
2554 goto trunc;
2555 aflags = *p;
2556 atype = *(p + 1);
2557 p += 2;
2558 len -= 2;
2559 length -= 2;
2560 alenlen = bgp_attr_lenlen(aflags, p);
2561 ND_TCHECK2(p[0], alenlen);
2562 if (len < alenlen)
2563 goto trunc;
2564 if (length < alenlen)
2565 goto trunc;
2566 alen = bgp_attr_len(aflags, p);
2567 p += alenlen;
2568 len -= alenlen;
2569 length -= alenlen;
2570
2571 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2572 tok2str(bgp_attr_values, "Unknown Attribute",
2573 atype),
2574 atype,
2575 alen));
2576
2577 if (aflags) {
2578 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2579 aflags & 0x80 ? "O" : "",
2580 aflags & 0x40 ? "T" : "",
2581 aflags & 0x20 ? "P" : "",
2582 aflags & 0x10 ? "E" : ""));
2583 if (aflags & 0xf)
2584 ND_PRINT((ndo, "+%x", aflags & 0xf));
2585 ND_PRINT((ndo, "]: "));
2586 }
2587 if (len < alen)
2588 goto trunc;
2589 if (length < alen)
2590 goto trunc;
2591 if (!bgp_attr_print(ndo, atype, p, alen))
2592 goto trunc;
2593 p += alen;
2594 len -= alen;
2595 length -= alen;
2596 }
2597 }
2598
2599 if (length) {
2600 /*
2601 * XXX - what if they're using the "Advertisement of
2602 * Multiple Paths in BGP" feature:
2603 *
2604 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/
2605 *
2606 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06
2607 */
2608 ND_PRINT((ndo, "\n\t Updated routes:"));
2609 while (length) {
2610 char buf[MAXHOSTNAMELEN + 100];
2611 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2612 if (i == -1) {
2613 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2614 break;
2615 } else if (i == -2)
2616 goto trunc;
2617 else if (i == -3)
2618 goto trunc; /* bytes left, but not enough */
2619 else {
2620 ND_PRINT((ndo, "\n\t %s", buf));
2621 p += i;
2622 length -= i;
2623 }
2624 }
2625 }
2626 return;
2627 trunc:
2628 ND_PRINT((ndo, "[|BGP]"));
2629 }
2630
2631 static void
2632 bgp_notification_print(netdissect_options *ndo,
2633 const u_char *dat, int length)
2634 {
2635 struct bgp_notification bgpn;
2636 const u_char *tptr;
2637 uint8_t shutdown_comm_length;
2638 uint8_t remainder_offset;
2639
2640 ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
2641 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
2642
2643 /* some little sanity checking */
2644 if (length<BGP_NOTIFICATION_SIZE)
2645 return;
2646
2647 ND_PRINT((ndo, ", %s (%u)",
2648 tok2str(bgp_notify_major_values, "Unknown Error",
2649 bgpn.bgpn_major),
2650 bgpn.bgpn_major));
2651
2652 switch (bgpn.bgpn_major) {
2653
2654 case BGP_NOTIFY_MAJOR_MSG:
2655 ND_PRINT((ndo, ", subcode %s (%u)",
2656 tok2str(bgp_notify_minor_msg_values, "Unknown",
2657 bgpn.bgpn_minor),
2658 bgpn.bgpn_minor));
2659 break;
2660 case BGP_NOTIFY_MAJOR_OPEN:
2661 ND_PRINT((ndo, ", subcode %s (%u)",
2662 tok2str(bgp_notify_minor_open_values, "Unknown",
2663 bgpn.bgpn_minor),
2664 bgpn.bgpn_minor));
2665 break;
2666 case BGP_NOTIFY_MAJOR_UPDATE:
2667 ND_PRINT((ndo, ", subcode %s (%u)",
2668 tok2str(bgp_notify_minor_update_values, "Unknown",
2669 bgpn.bgpn_minor),
2670 bgpn.bgpn_minor));
2671 break;
2672 case BGP_NOTIFY_MAJOR_FSM:
2673 ND_PRINT((ndo, " subcode %s (%u)",
2674 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2675 bgpn.bgpn_minor),
2676 bgpn.bgpn_minor));
2677 break;
2678 case BGP_NOTIFY_MAJOR_CAP:
2679 ND_PRINT((ndo, " subcode %s (%u)",
2680 tok2str(bgp_notify_minor_cap_values, "Unknown",
2681 bgpn.bgpn_minor),
2682 bgpn.bgpn_minor));
2683 break;
2684 case BGP_NOTIFY_MAJOR_CEASE:
2685 ND_PRINT((ndo, ", subcode %s (%u)",
2686 tok2str(bgp_notify_minor_cease_values, "Unknown",
2687 bgpn.bgpn_minor),
2688 bgpn.bgpn_minor));
2689
2690 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2691 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2692 */
2693 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2694 tptr = dat + BGP_NOTIFICATION_SIZE;
2695 ND_TCHECK2(*tptr, 7);
2696 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2697 tok2str(af_values, "Unknown",
2698 EXTRACT_16BITS(tptr)),
2699 EXTRACT_16BITS(tptr),
2700 tok2str(bgp_safi_values, "Unknown", *(tptr+2)),
2701 *(tptr+2),
2702 EXTRACT_32BITS(tptr+3)));
2703 }
2704 /*
2705 * draft-ietf-idr-shutdown describes a method to send a communication
2706 * intended for human consumption regarding the Administrative Shutdown
2707 */
2708 if ((bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
2709 bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
2710 length >= BGP_NOTIFICATION_SIZE + 1) {
2711 tptr = dat + BGP_NOTIFICATION_SIZE;
2712 ND_TCHECK2(*tptr, 1);
2713 shutdown_comm_length = *(tptr);
2714 remainder_offset = 0;
2715 /* garbage, hexdump it all */
2716 if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN ||
2717 shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) {
2718 ND_PRINT((ndo, ", invalid Shutdown Communication length"));
2719 }
2720 else if (shutdown_comm_length == 0) {
2721 ND_PRINT((ndo, ", empty Shutdown Communication"));
2722 remainder_offset += 1;
2723 }
2724 /* a proper shutdown communication */
2725 else {
2726 ND_TCHECK2(*(tptr+1), shutdown_comm_length);
2727 ND_PRINT((ndo, ", Shutdown Communication (length: %u): \"", shutdown_comm_length));
2728 (void)fn_printn(ndo, tptr+1, shutdown_comm_length, NULL);
2729 ND_PRINT((ndo, "\""));
2730 remainder_offset += shutdown_comm_length + 1;
2731 }
2732 /* if there is trailing data, hexdump it */
2733 if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) {
2734 ND_PRINT((ndo, ", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE)));
2735 hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE));
2736 }
2737 }
2738 break;
2739 default:
2740 break;
2741 }
2742
2743 return;
2744 trunc:
2745 ND_PRINT((ndo, "[|BGP]"));
2746 }
2747
2748 static void
2749 bgp_route_refresh_print(netdissect_options *ndo,
2750 const u_char *pptr, int len)
2751 {
2752 const struct bgp_route_refresh *bgp_route_refresh_header;
2753
2754 ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE);
2755
2756 /* some little sanity checking */
2757 if (len<BGP_ROUTE_REFRESH_SIZE)
2758 return;
2759
2760 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2761
2762 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)",
2763 tok2str(af_values,"Unknown",
2764 /* this stinks but the compiler pads the structure
2765 * weird */
2766 EXTRACT_16BITS(&bgp_route_refresh_header->afi)),
2767 EXTRACT_16BITS(&bgp_route_refresh_header->afi),
2768 tok2str(bgp_safi_values,"Unknown",
2769 bgp_route_refresh_header->safi),
2770 bgp_route_refresh_header->safi));
2771
2772 if (ndo->ndo_vflag > 1) {
2773 ND_TCHECK2(*pptr, len);
2774 print_unknown_data(ndo, pptr, "\n\t ", len);
2775 }
2776
2777 return;
2778 trunc:
2779 ND_PRINT((ndo, "[|BGP]"));
2780 }
2781
2782 static int
2783 bgp_header_print(netdissect_options *ndo,
2784 const u_char *dat, int length)
2785 {
2786 struct bgp bgp;
2787
2788 ND_TCHECK2(dat[0], BGP_SIZE);
2789 memcpy(&bgp, dat, BGP_SIZE);
2790 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2791 tok2str(bgp_msg_values, "Unknown", bgp.bgp_type),
2792 bgp.bgp_type,
2793 length));
2794
2795 switch (bgp.bgp_type) {
2796 case BGP_OPEN:
2797 bgp_open_print(ndo, dat, length);
2798 break;
2799 case BGP_UPDATE:
2800 bgp_update_print(ndo, dat, length);
2801 break;
2802 case BGP_NOTIFICATION:
2803 bgp_notification_print(ndo, dat, length);
2804 break;
2805 case BGP_KEEPALIVE:
2806 break;
2807 case BGP_ROUTE_REFRESH:
2808 bgp_route_refresh_print(ndo, dat, length);
2809 break;
2810 default:
2811 /* we have no decoder for the BGP message */
2812 ND_TCHECK2(*dat, length);
2813 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type));
2814 print_unknown_data(ndo, dat, "\n\t ", length);
2815 break;
2816 }
2817 return 1;
2818 trunc:
2819 ND_PRINT((ndo, "[|BGP]"));
2820 return 0;
2821 }
2822
2823 void
2824 bgp_print(netdissect_options *ndo,
2825 const u_char *dat, int length)
2826 {
2827 const u_char *p;
2828 const u_char *ep;
2829 const u_char *start;
2830 const u_char marker[] = {
2831 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2832 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2833 };
2834 struct bgp bgp;
2835 uint16_t hlen;
2836
2837 ep = dat + length;
2838 if (ndo->ndo_snapend < dat + length)
2839 ep = ndo->ndo_snapend;
2840
2841 ND_PRINT((ndo, ": BGP"));
2842
2843 if (ndo->ndo_vflag < 1) /* lets be less chatty */
2844 return;
2845
2846 p = dat;
2847 start = p;
2848 while (p < ep) {
2849 if (!ND_TTEST2(p[0], 1))
2850 break;
2851 if (p[0] != 0xff) {
2852 p++;
2853 continue;
2854 }
2855
2856 if (!ND_TTEST2(p[0], sizeof(marker)))
2857 break;
2858 if (memcmp(p, marker, sizeof(marker)) != 0) {
2859 p++;
2860 continue;
2861 }
2862
2863 /* found BGP header */
2864 ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/
2865 memcpy(&bgp, p, BGP_SIZE);
2866
2867 if (start != p)
2868 ND_PRINT((ndo, " [|BGP]"));
2869
2870 hlen = ntohs(bgp.bgp_len);
2871 if (hlen < BGP_SIZE) {
2872 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
2873 BGP_SIZE));
2874 break;
2875 }
2876
2877 if (ND_TTEST2(p[0], hlen)) {
2878 if (!bgp_header_print(ndo, p, hlen))
2879 return;
2880 p += hlen;
2881 start = p;
2882 } else {
2883 ND_PRINT((ndo, "\n[|BGP %s]",
2884 tok2str(bgp_msg_values,
2885 "Unknown Message Type",
2886 bgp.bgp_type)));
2887 break;
2888 }
2889 }
2890
2891 return;
2892
2893 trunc:
2894 ND_PRINT((ndo, " [|BGP]"));
2895 }
2896
2897 /*
2898 * Local Variables:
2899 * c-style: whitesmith
2900 * c-basic-offset: 4
2901 * End:
2902 */
[mirror] the TCPdump network dissector