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CVE-2017-12900/Properly terminate all struct tok arrays.
[tcpdump] / print-bgp.c
1 /*
2 * Copyright (C) 1999 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * Extensively modified by Hannes Gredler (hannes@gredler.at) for more
30 * complete BGP support.
31 */
32
33 /* \summary: Border Gateway Protocol (BGP) printer */
34
35 #ifdef HAVE_CONFIG_H
36 #include "config.h"
37 #endif
38
39 #include <netdissect-stdinc.h>
40
41 #include <stdio.h>
42 #include <string.h>
43
44 #include "netdissect.h"
45 #include "addrtoname.h"
46 #include "extract.h"
47 #include "af.h"
48 #include "l2vpn.h"
49
50 struct bgp {
51 uint8_t bgp_marker[16];
52 uint16_t bgp_len;
53 uint8_t bgp_type;
54 };
55 #define BGP_SIZE 19 /* unaligned */
56
57 #define BGP_OPEN 1
58 #define BGP_UPDATE 2
59 #define BGP_NOTIFICATION 3
60 #define BGP_KEEPALIVE 4
61 #define BGP_ROUTE_REFRESH 5
62
63 static const struct tok bgp_msg_values[] = {
64 { BGP_OPEN, "Open"},
65 { BGP_UPDATE, "Update"},
66 { BGP_NOTIFICATION, "Notification"},
67 { BGP_KEEPALIVE, "Keepalive"},
68 { BGP_ROUTE_REFRESH, "Route Refresh"},
69 { 0, NULL}
70 };
71
72 struct bgp_open {
73 uint8_t bgpo_marker[16];
74 uint16_t bgpo_len;
75 uint8_t bgpo_type;
76 uint8_t bgpo_version;
77 uint16_t bgpo_myas;
78 uint16_t bgpo_holdtime;
79 uint32_t bgpo_id;
80 uint8_t bgpo_optlen;
81 /* options should follow */
82 };
83 #define BGP_OPEN_SIZE 29 /* unaligned */
84
85 struct bgp_opt {
86 uint8_t bgpopt_type;
87 uint8_t bgpopt_len;
88 /* variable length */
89 };
90 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
91 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
92
93 struct bgp_notification {
94 uint8_t bgpn_marker[16];
95 uint16_t bgpn_len;
96 uint8_t bgpn_type;
97 uint8_t bgpn_major;
98 uint8_t bgpn_minor;
99 };
100 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
101
102 struct bgp_route_refresh {
103 uint8_t bgp_marker[16];
104 uint16_t len;
105 uint8_t type;
106 uint8_t afi[2]; /* the compiler messes this structure up */
107 uint8_t res; /* when doing misaligned sequences of int8 and int16 */
108 uint8_t safi; /* afi should be int16 - so we have to access it using */
109 }; /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh) */
110 #define BGP_ROUTE_REFRESH_SIZE 23
111
112 #define bgp_attr_lenlen(flags, p) \
113 (((flags) & 0x10) ? 2 : 1)
114 #define bgp_attr_len(flags, p) \
115 (((flags) & 0x10) ? EXTRACT_16BITS(p) : *(p))
116
117 #define BGPTYPE_ORIGIN 1
118 #define BGPTYPE_AS_PATH 2
119 #define BGPTYPE_NEXT_HOP 3
120 #define BGPTYPE_MULTI_EXIT_DISC 4
121 #define BGPTYPE_LOCAL_PREF 5
122 #define BGPTYPE_ATOMIC_AGGREGATE 6
123 #define BGPTYPE_AGGREGATOR 7
124 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
125 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */
126 #define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */
127 #define BGPTYPE_DPA 11 /* deprecated, draft-ietf-idr-bgp-dpa */
128 #define BGPTYPE_ADVERTISERS 12 /* deprecated RFC1863 */
129 #define BGPTYPE_RCID_PATH 13 /* deprecated RFC1863 */
130 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */
131 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */
132 #define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */
133 #define BGPTYPE_AS4_PATH 17 /* RFC6793 */
134 #define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */
135 #define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */
136 #define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */
137 #define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */
138 #define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */
139 #define BGPTYPE_AIGP 26 /* RFC7311 */
140 #define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */
141 #define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */
142 #define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */
143 #define BGPTYPE_ATTR_SET 128 /* RFC6368 */
144
145 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
146
147 static const struct tok bgp_attr_values[] = {
148 { BGPTYPE_ORIGIN, "Origin"},
149 { BGPTYPE_AS_PATH, "AS Path"},
150 { BGPTYPE_AS4_PATH, "AS4 Path"},
151 { BGPTYPE_NEXT_HOP, "Next Hop"},
152 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
153 { BGPTYPE_LOCAL_PREF, "Local Preference"},
154 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
155 { BGPTYPE_AGGREGATOR, "Aggregator"},
156 { BGPTYPE_AGGREGATOR4, "Aggregator4"},
157 { BGPTYPE_COMMUNITIES, "Community"},
158 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
159 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
160 { BGPTYPE_DPA, "DPA"},
161 { BGPTYPE_ADVERTISERS, "Advertisers"},
162 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"},
163 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
164 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
165 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
166 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
167 { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"},
168 { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"},
169 { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
170 { BGPTYPE_AIGP, "Accumulated IGP Metric"},
171 { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
172 { BGPTYPE_ENTROPY_LABEL, "Entropy Label"},
173 { BGPTYPE_LARGE_COMMUNITY, "Large Community"},
174 { BGPTYPE_ATTR_SET, "Attribute Set"},
175 { 255, "Reserved for development"},
176 { 0, NULL}
177 };
178
179 #define BGP_AS_SET 1
180 #define BGP_AS_SEQUENCE 2
181 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
182 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
183
184 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
185 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
186
187 static const struct tok bgp_as_path_segment_open_values[] = {
188 { BGP_AS_SEQUENCE, ""},
189 { BGP_AS_SET, "{ "},
190 { BGP_CONFED_AS_SEQUENCE, "( "},
191 { BGP_CONFED_AS_SET, "({ "},
192 { 0, NULL}
193 };
194
195 static const struct tok bgp_as_path_segment_close_values[] = {
196 { BGP_AS_SEQUENCE, ""},
197 { BGP_AS_SET, "}"},
198 { BGP_CONFED_AS_SEQUENCE, ")"},
199 { BGP_CONFED_AS_SET, "})"},
200 { 0, NULL}
201 };
202
203 #define BGP_OPT_AUTH 1
204 #define BGP_OPT_CAP 2
205
206 static const struct tok bgp_opt_values[] = {
207 { BGP_OPT_AUTH, "Authentication Information"},
208 { BGP_OPT_CAP, "Capabilities Advertisement"},
209 { 0, NULL}
210 };
211
212 #define BGP_CAPCODE_MP 1 /* RFC2858 */
213 #define BGP_CAPCODE_RR 2 /* RFC2918 */
214 #define BGP_CAPCODE_ORF 3 /* RFC5291 */
215 #define BGP_CAPCODE_MR 4 /* RFC3107 */
216 #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */
217 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */
218 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
219 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
220 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
221 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
222 #define BGP_CAPCODE_ENH_RR 70 /* draft-keyur-bgp-enhanced-route-refresh */
223 #define BGP_CAPCODE_RR_CISCO 128
224
225 static const struct tok bgp_capcode_values[] = {
226 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
227 { BGP_CAPCODE_RR, "Route Refresh"},
228 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
229 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
230 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
231 { BGP_CAPCODE_RESTART, "Graceful Restart"},
232 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
233 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
234 { BGP_CAPCODE_MULTISESS, "Multisession BGP"},
235 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
236 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
237 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
238 { 0, NULL}
239 };
240
241 #define BGP_NOTIFY_MAJOR_MSG 1
242 #define BGP_NOTIFY_MAJOR_OPEN 2
243 #define BGP_NOTIFY_MAJOR_UPDATE 3
244 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
245 #define BGP_NOTIFY_MAJOR_FSM 5
246 #define BGP_NOTIFY_MAJOR_CEASE 6
247 #define BGP_NOTIFY_MAJOR_CAP 7
248
249 static const struct tok bgp_notify_major_values[] = {
250 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
251 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
252 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
253 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
254 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
255 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
256 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"},
257 { 0, NULL}
258 };
259
260 /* draft-ietf-idr-cease-subcode-02 */
261 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
262 static const struct tok bgp_notify_minor_cease_values[] = {
263 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
264 { 2, "Administratively Shutdown"},
265 { 3, "Peer Unconfigured"},
266 { 4, "Administratively Reset"},
267 { 5, "Connection Rejected"},
268 { 6, "Other Configuration Change"},
269 { 7, "Connection Collision Resolution"},
270 { 0, NULL}
271 };
272
273 static const struct tok bgp_notify_minor_msg_values[] = {
274 { 1, "Connection Not Synchronized"},
275 { 2, "Bad Message Length"},
276 { 3, "Bad Message Type"},
277 { 0, NULL}
278 };
279
280 static const struct tok bgp_notify_minor_open_values[] = {
281 { 1, "Unsupported Version Number"},
282 { 2, "Bad Peer AS"},
283 { 3, "Bad BGP Identifier"},
284 { 4, "Unsupported Optional Parameter"},
285 { 5, "Authentication Failure"},
286 { 6, "Unacceptable Hold Time"},
287 { 7, "Capability Message Error"},
288 { 0, NULL}
289 };
290
291 static const struct tok bgp_notify_minor_update_values[] = {
292 { 1, "Malformed Attribute List"},
293 { 2, "Unrecognized Well-known Attribute"},
294 { 3, "Missing Well-known Attribute"},
295 { 4, "Attribute Flags Error"},
296 { 5, "Attribute Length Error"},
297 { 6, "Invalid ORIGIN Attribute"},
298 { 7, "AS Routing Loop"},
299 { 8, "Invalid NEXT_HOP Attribute"},
300 { 9, "Optional Attribute Error"},
301 { 10, "Invalid Network Field"},
302 { 11, "Malformed AS_PATH"},
303 { 0, NULL}
304 };
305
306 static const struct tok bgp_notify_minor_fsm_values[] = {
307 { 1, "In OpenSent State"},
308 { 2, "In OpenConfirm State"},
309 { 3, "In Established State"},
310 { 0, NULL }
311 };
312
313 static const struct tok bgp_notify_minor_cap_values[] = {
314 { 1, "Invalid Action Value" },
315 { 2, "Invalid Capability Length" },
316 { 3, "Malformed Capability Value" },
317 { 4, "Unsupported Capability Code" },
318 { 0, NULL }
319 };
320
321 static const struct tok bgp_origin_values[] = {
322 { 0, "IGP"},
323 { 1, "EGP"},
324 { 2, "Incomplete"},
325 { 0, NULL}
326 };
327
328 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1
329 #define BGP_PMSI_TUNNEL_LDP_P2MP 2
330 #define BGP_PMSI_TUNNEL_PIM_SSM 3
331 #define BGP_PMSI_TUNNEL_PIM_SM 4
332 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5
333 #define BGP_PMSI_TUNNEL_INGRESS 6
334 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7
335
336 static const struct tok bgp_pmsi_tunnel_values[] = {
337 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
338 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
339 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
340 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
341 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
342 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
343 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
344 { 0, NULL}
345 };
346
347 static const struct tok bgp_pmsi_flag_values[] = {
348 { 0x01, "Leaf Information required"},
349 { 0, NULL}
350 };
351
352 #define BGP_AIGP_TLV 1
353
354 static const struct tok bgp_aigp_values[] = {
355 { BGP_AIGP_TLV, "AIGP"},
356 { 0, NULL}
357 };
358
359 /* Subsequent address family identifier, RFC2283 section 7 */
360 #define SAFNUM_RES 0
361 #define SAFNUM_UNICAST 1
362 #define SAFNUM_MULTICAST 2
363 #define SAFNUM_UNIMULTICAST 3 /* deprecated now */
364 /* labeled BGP RFC3107 */
365 #define SAFNUM_LABUNICAST 4
366 /* RFC6514 */
367 #define SAFNUM_MULTICAST_VPN 5
368 /* draft-nalawade-kapoor-tunnel-safi */
369 #define SAFNUM_TUNNEL 64
370 /* RFC4761 */
371 #define SAFNUM_VPLS 65
372 /* RFC6037 */
373 #define SAFNUM_MDT 66
374 /* RFC4364 */
375 #define SAFNUM_VPNUNICAST 128
376 /* RFC6513 */
377 #define SAFNUM_VPNMULTICAST 129
378 #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */
379 /* RFC4684 */
380 #define SAFNUM_RT_ROUTING_INFO 132
381
382 #define BGP_VPN_RD_LEN 8
383
384 static const struct tok bgp_safi_values[] = {
385 { SAFNUM_RES, "Reserved"},
386 { SAFNUM_UNICAST, "Unicast"},
387 { SAFNUM_MULTICAST, "Multicast"},
388 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
389 { SAFNUM_LABUNICAST, "labeled Unicast"},
390 { SAFNUM_TUNNEL, "Tunnel"},
391 { SAFNUM_VPLS, "VPLS"},
392 { SAFNUM_MDT, "MDT"},
393 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
394 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
395 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
396 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
397 { SAFNUM_MULTICAST_VPN, "Multicast VPN"},
398 { 0, NULL }
399 };
400
401 /* well-known community */
402 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
403 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
404 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
405
406 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */
407 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
408 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
409 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
410 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
411 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
412 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
413 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
414 /* rfc2547 bgp-mpls-vpns */
415 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
416 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatability */
417 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatability */
418 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatability */
419
420 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
421 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatability */
422
423 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
424 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatability */
425
426 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
427
428 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
429 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
430 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
431 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */
432
433 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */
434 #define BGP_EXT_COM_EIGRP_GEN 0x8800
435 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801
436 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
437 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803
438 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804
439 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
440
441 static const struct tok bgp_extd_comm_flag_values[] = {
442 { 0x8000, "vendor-specific"},
443 { 0x4000, "non-transitive"},
444 { 0, NULL},
445 };
446
447 static const struct tok bgp_extd_comm_subtype_values[] = {
448 { BGP_EXT_COM_RT_0, "target"},
449 { BGP_EXT_COM_RT_1, "target"},
450 { BGP_EXT_COM_RT_2, "target"},
451 { BGP_EXT_COM_RO_0, "origin"},
452 { BGP_EXT_COM_RO_1, "origin"},
453 { BGP_EXT_COM_RO_2, "origin"},
454 { BGP_EXT_COM_LINKBAND, "link-BW"},
455 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
456 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
457 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
458 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
459 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
460 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
461 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
462 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
463 { BGP_EXT_COM_L2INFO, "layer2-info"},
464 { BGP_EXT_COM_EIGRP_GEN , "eigrp-general-route (flag, tag)" },
465 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY , "eigrp-route-metric (AS, delay)" },
466 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW , "eigrp-route-metric (reliability, nexthop, bandwidth)" },
467 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU , "eigrp-route-metric (load, MTU)" },
468 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID , "eigrp-external-route (remote-AS, remote-ID)" },
469 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC , "eigrp-external-route (remote-proto, remote-metric)" },
470 { BGP_EXT_COM_SOURCE_AS, "source-AS" },
471 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
472 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
473 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
474 { 0, NULL},
475 };
476
477 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
478 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
479 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
480 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
481 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
482 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
483 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
484 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
485
486 static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
487 { BGP_OSPF_RTYPE_RTR, "Router" },
488 { BGP_OSPF_RTYPE_NET, "Network" },
489 { BGP_OSPF_RTYPE_SUM, "Summary" },
490 { BGP_OSPF_RTYPE_EXT, "External" },
491 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
492 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
493 { 0, NULL },
494 };
495
496 /* ADD-PATH Send/Receive field values */
497 static const struct tok bgp_add_path_recvsend[] = {
498 { 1, "Receive" },
499 { 2, "Send" },
500 { 3, "Both" },
501 { 0, NULL },
502 };
503
504 static char astostr[20];
505
506 /*
507 * as_printf
508 *
509 * Convert an AS number into a string and return string pointer.
510 *
511 * Depending on bflag is set or not, AS number is converted into ASDOT notation
512 * or plain number notation.
513 *
514 */
515 static char *
516 as_printf(netdissect_options *ndo,
517 char *str, int size, u_int asnum)
518 {
519 if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
520 snprintf(str, size, "%u", asnum);
521 } else {
522 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
523 }
524 return str;
525 }
526
527 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
528
529 int
530 decode_prefix4(netdissect_options *ndo,
531 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
532 {
533 struct in_addr addr;
534 u_int plen, plenbytes;
535
536 ND_TCHECK(pptr[0]);
537 ITEMCHECK(1);
538 plen = pptr[0];
539 if (32 < plen)
540 return -1;
541 itemlen -= 1;
542
543 memset(&addr, 0, sizeof(addr));
544 plenbytes = (plen + 7) / 8;
545 ND_TCHECK2(pptr[1], plenbytes);
546 ITEMCHECK(plenbytes);
547 memcpy(&addr, &pptr[1], plenbytes);
548 if (plen % 8) {
549 ((u_char *)&addr)[plenbytes - 1] &=
550 ((0xff00 >> (plen % 8)) & 0xff);
551 }
552 snprintf(buf, buflen, "%s/%d", ipaddr_string(ndo, &addr), plen);
553 return 1 + plenbytes;
554
555 trunc:
556 return -2;
557
558 badtlv:
559 return -3;
560 }
561
562 static int
563 decode_labeled_prefix4(netdissect_options *ndo,
564 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
565 {
566 struct in_addr addr;
567 u_int plen, plenbytes;
568
569 /* prefix length and label = 4 bytes */
570 ND_TCHECK2(pptr[0], 4);
571 ITEMCHECK(4);
572 plen = pptr[0]; /* get prefix length */
573
574 /* this is one of the weirdnesses of rfc3107
575 the label length (actually the label + COS bits)
576 is added to the prefix length;
577 we also do only read out just one label -
578 there is no real application for advertisement of
579 stacked labels in a single BGP message
580 */
581
582 if (24 > plen)
583 return -1;
584
585 plen-=24; /* adjust prefixlen - labellength */
586
587 if (32 < plen)
588 return -1;
589 itemlen -= 4;
590
591 memset(&addr, 0, sizeof(addr));
592 plenbytes = (plen + 7) / 8;
593 ND_TCHECK2(pptr[4], plenbytes);
594 ITEMCHECK(plenbytes);
595 memcpy(&addr, &pptr[4], plenbytes);
596 if (plen % 8) {
597 ((u_char *)&addr)[plenbytes - 1] &=
598 ((0xff00 >> (plen % 8)) & 0xff);
599 }
600 /* the label may get offsetted by 4 bits so lets shift it right */
601 snprintf(buf, buflen, "%s/%d, label:%u %s",
602 ipaddr_string(ndo, &addr),
603 plen,
604 EXTRACT_24BITS(pptr+1)>>4,
605 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
606
607 return 4 + plenbytes;
608
609 trunc:
610 return -2;
611
612 badtlv:
613 return -3;
614 }
615
616 /*
617 * bgp_vpn_ip_print
618 *
619 * print an ipv4 or ipv6 address into a buffer dependend on address length.
620 */
621 static char *
622 bgp_vpn_ip_print(netdissect_options *ndo,
623 const u_char *pptr, u_int addr_length)
624 {
625
626 /* worst case string is s fully formatted v6 address */
627 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
628 char *pos = addr;
629
630 switch(addr_length) {
631 case (sizeof(struct in_addr) << 3): /* 32 */
632 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
633 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
634 break;
635 case (sizeof(struct in6_addr) << 3): /* 128 */
636 ND_TCHECK2(pptr[0], sizeof(struct in6_addr));
637 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
638 break;
639 default:
640 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
641 break;
642 }
643 pos += strlen(pos);
644
645 trunc:
646 *(pos) = '\0';
647 return (addr);
648 }
649
650 /*
651 * bgp_vpn_sg_print
652 *
653 * print an multicast s,g entry into a buffer.
654 * the s,g entry is encoded like this.
655 *
656 * +-----------------------------------+
657 * | Multicast Source Length (1 octet) |
658 * +-----------------------------------+
659 * | Multicast Source (Variable) |
660 * +-----------------------------------+
661 * | Multicast Group Length (1 octet) |
662 * +-----------------------------------+
663 * | Multicast Group (Variable) |
664 * +-----------------------------------+
665 *
666 * return the number of bytes read from the wire.
667 */
668 static int
669 bgp_vpn_sg_print(netdissect_options *ndo,
670 const u_char *pptr, char *buf, u_int buflen)
671 {
672 uint8_t addr_length;
673 u_int total_length, offset;
674
675 total_length = 0;
676
677 /* Source address length, encoded in bits */
678 ND_TCHECK2(pptr[0], 1);
679 addr_length = *pptr++;
680
681 /* Source address */
682 ND_TCHECK2(pptr[0], (addr_length >> 3));
683 total_length += (addr_length >> 3) + 1;
684 offset = strlen(buf);
685 if (addr_length) {
686 snprintf(buf + offset, buflen - offset, ", Source %s",
687 bgp_vpn_ip_print(ndo, pptr, addr_length));
688 pptr += (addr_length >> 3);
689 }
690
691 /* Group address length, encoded in bits */
692 ND_TCHECK2(pptr[0], 1);
693 addr_length = *pptr++;
694
695 /* Group address */
696 ND_TCHECK2(pptr[0], (addr_length >> 3));
697 total_length += (addr_length >> 3) + 1;
698 offset = strlen(buf);
699 if (addr_length) {
700 snprintf(buf + offset, buflen - offset, ", Group %s",
701 bgp_vpn_ip_print(ndo, pptr, addr_length));
702 pptr += (addr_length >> 3);
703 }
704
705 trunc:
706 return (total_length);
707 }
708
709 /* RDs and RTs share the same semantics
710 * we use bgp_vpn_rd_print for
711 * printing route targets inside a NLRI */
712 char *
713 bgp_vpn_rd_print(netdissect_options *ndo,
714 const u_char *pptr)
715 {
716 /* allocate space for the largest possible string */
717 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
718 char *pos = rd;
719
720 /* ok lets load the RD format */
721 switch (EXTRACT_16BITS(pptr)) {
722
723 /* 2-byte-AS:number fmt*/
724 case 0:
725 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
726 EXTRACT_16BITS(pptr+2),
727 EXTRACT_32BITS(pptr+4),
728 *(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7));
729 break;
730 /* IP-address:AS fmt*/
731
732 case 1:
733 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
734 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6));
735 break;
736
737 /* 4-byte-AS:number fmt*/
738 case 2:
739 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
740 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+2)),
741 EXTRACT_16BITS(pptr+6), *(pptr+2), *(pptr+3), *(pptr+4),
742 *(pptr+5), EXTRACT_16BITS(pptr+6));
743 break;
744 default:
745 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
746 break;
747 }
748 pos += strlen(pos);
749 *(pos) = '\0';
750 return (rd);
751 }
752
753 static int
754 decode_rt_routing_info(netdissect_options *ndo,
755 const u_char *pptr, char *buf, u_int buflen)
756 {
757 uint8_t route_target[8];
758 u_int plen;
759
760 ND_TCHECK(pptr[0]);
761 plen = pptr[0]; /* get prefix length */
762
763 if (0 == plen) {
764 snprintf(buf, buflen, "default route target");
765 return 1;
766 }
767
768 if (32 > plen)
769 return -1;
770
771 plen-=32; /* adjust prefix length */
772
773 if (64 < plen)
774 return -1;
775
776 memset(&route_target, 0, sizeof(route_target));
777 ND_TCHECK2(pptr[1], (plen + 7) / 8);
778 memcpy(&route_target, &pptr[1], (plen + 7) / 8);
779 if (plen % 8) {
780 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
781 ((0xff00 >> (plen % 8)) & 0xff);
782 }
783 snprintf(buf, buflen, "origin AS: %s, route target %s",
784 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+1)),
785 bgp_vpn_rd_print(ndo, (u_char *)&route_target));
786
787 return 5 + (plen + 7) / 8;
788
789 trunc:
790 return -2;
791 }
792
793 static int
794 decode_labeled_vpn_prefix4(netdissect_options *ndo,
795 const u_char *pptr, char *buf, u_int buflen)
796 {
797 struct in_addr addr;
798 u_int plen;
799
800 ND_TCHECK(pptr[0]);
801 plen = pptr[0]; /* get prefix length */
802
803 if ((24+64) > plen)
804 return -1;
805
806 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
807
808 if (32 < plen)
809 return -1;
810
811 memset(&addr, 0, sizeof(addr));
812 ND_TCHECK2(pptr[12], (plen + 7) / 8);
813 memcpy(&addr, &pptr[12], (plen + 7) / 8);
814 if (plen % 8) {
815 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
816 ((0xff00 >> (plen % 8)) & 0xff);
817 }
818 /* the label may get offsetted by 4 bits so lets shift it right */
819 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
820 bgp_vpn_rd_print(ndo, pptr+4),
821 ipaddr_string(ndo, &addr),
822 plen,
823 EXTRACT_24BITS(pptr+1)>>4,
824 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
825
826 return 12 + (plen + 7) / 8;
827
828 trunc:
829 return -2;
830 }
831
832 /*
833 * +-------------------------------+
834 * | |
835 * | RD:IPv4-address (12 octets) |
836 * | |
837 * +-------------------------------+
838 * | MDT Group-address (4 octets) |
839 * +-------------------------------+
840 */
841
842 #define MDT_VPN_NLRI_LEN 16
843
844 static int
845 decode_mdt_vpn_nlri(netdissect_options *ndo,
846 const u_char *pptr, char *buf, u_int buflen)
847 {
848
849 const u_char *rd;
850 const u_char *vpn_ip;
851
852 ND_TCHECK(pptr[0]);
853
854 /* if the NLRI is not predefined length, quit.*/
855 if (*pptr != MDT_VPN_NLRI_LEN * 8)
856 return -1;
857 pptr++;
858
859 /* RD */
860 ND_TCHECK2(pptr[0], 8);
861 rd = pptr;
862 pptr+=8;
863
864 /* IPv4 address */
865 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
866 vpn_ip = pptr;
867 pptr+=sizeof(struct in_addr);
868
869 /* MDT Group Address */
870 ND_TCHECK2(pptr[0], sizeof(struct in_addr));
871
872 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
873 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
874
875 return MDT_VPN_NLRI_LEN + 1;
876
877 trunc:
878
879 return -2;
880 }
881
882 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
883 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
884 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
885 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
886 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
887 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
888 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
889
890 static const struct tok bgp_multicast_vpn_route_type_values[] = {
891 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
892 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
893 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
894 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
895 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
896 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
897 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
898 { 0, NULL}
899 };
900
901 static int
902 decode_multicast_vpn(netdissect_options *ndo,
903 const u_char *pptr, char *buf, u_int buflen)
904 {
905 uint8_t route_type, route_length, addr_length, sg_length;
906 u_int offset;
907
908 ND_TCHECK2(pptr[0], 2);
909 route_type = *pptr++;
910 route_length = *pptr++;
911
912 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
913 tok2str(bgp_multicast_vpn_route_type_values,
914 "Unknown", route_type),
915 route_type, route_length);
916
917 switch(route_type) {
918 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
919 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
920 offset = strlen(buf);
921 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
922 bgp_vpn_rd_print(ndo, pptr),
923 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
924 (route_length - BGP_VPN_RD_LEN) << 3));
925 break;
926 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
927 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4);
928 offset = strlen(buf);
929 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
930 bgp_vpn_rd_print(ndo, pptr),
931 as_printf(ndo, astostr, sizeof(astostr),
932 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
933 break;
934
935 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
936 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
937 offset = strlen(buf);
938 snprintf(buf + offset, buflen - offset, ", RD: %s",
939 bgp_vpn_rd_print(ndo, pptr));
940 pptr += BGP_VPN_RD_LEN;
941
942 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
943 addr_length = route_length - sg_length;
944
945 ND_TCHECK2(pptr[0], addr_length);
946 offset = strlen(buf);
947 snprintf(buf + offset, buflen - offset, ", Originator %s",
948 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
949 break;
950
951 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
952 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
953 offset = strlen(buf);
954 snprintf(buf + offset, buflen - offset, ", RD: %s",
955 bgp_vpn_rd_print(ndo, pptr));
956 pptr += BGP_VPN_RD_LEN;
957
958 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
959 break;
960
961 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
962 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
963 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
964 offset = strlen(buf);
965 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
966 bgp_vpn_rd_print(ndo, pptr),
967 as_printf(ndo, astostr, sizeof(astostr),
968 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
969 pptr += BGP_VPN_RD_LEN;
970
971 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
972 break;
973
974 /*
975 * no per route-type printing yet.
976 */
977 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
978 default:
979 break;
980 }
981
982 return route_length + 2;
983
984 trunc:
985 return -2;
986 }
987
988 /*
989 * As I remember, some versions of systems have an snprintf() that
990 * returns -1 if the buffer would have overflowed. If the return
991 * value is negative, set buflen to 0, to indicate that we've filled
992 * the buffer up.
993 *
994 * If the return value is greater than buflen, that means that
995 * the buffer would have overflowed; again, set buflen to 0 in
996 * that case.
997 */
998 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
999 if (stringlen<0) \
1000 buflen=0; \
1001 else if ((u_int)stringlen>buflen) \
1002 buflen=0; \
1003 else { \
1004 buflen-=stringlen; \
1005 buf+=stringlen; \
1006 }
1007
1008 static int
1009 decode_labeled_vpn_l2(netdissect_options *ndo,
1010 const u_char *pptr, char *buf, u_int buflen)
1011 {
1012 int plen,tlen,stringlen,tlv_type,tlv_len,ttlv_len;
1013
1014 ND_TCHECK2(pptr[0], 2);
1015 plen=EXTRACT_16BITS(pptr);
1016 tlen=plen;
1017 pptr+=2;
1018 /* Old and new L2VPN NLRI share AFI/SAFI
1019 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1020 * and > 17 as old format. Complain for the middle case
1021 */
1022 if (plen==12) {
1023 /* assume AD-only with RD, BGPNH */
1024 ND_TCHECK2(pptr[0],12);
1025 buf[0]='\0';
1026 stringlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1027 bgp_vpn_rd_print(ndo, pptr),
1028 ipaddr_string(ndo, pptr+8)
1029 );
1030 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1031 pptr+=12;
1032 tlen-=12;
1033 return plen;
1034 } else if (plen>17) {
1035 /* assume old format */
1036 /* RD, ID, LBLKOFF, LBLBASE */
1037
1038 ND_TCHECK2(pptr[0],15);
1039 buf[0]='\0';
1040 stringlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1041 bgp_vpn_rd_print(ndo, pptr),
1042 EXTRACT_16BITS(pptr+8),
1043 EXTRACT_16BITS(pptr+10),
1044 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1045 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1046 pptr+=15;
1047 tlen-=15;
1048
1049 /* ok now the variable part - lets read out TLVs*/
1050 while (tlen>0) {
1051 if (tlen < 3)
1052 return -1;
1053 ND_TCHECK2(pptr[0], 3);
1054 tlv_type=*pptr++;
1055 tlv_len=EXTRACT_16BITS(pptr);
1056 ttlv_len=tlv_len;
1057 pptr+=2;
1058
1059 switch(tlv_type) {
1060 case 1:
1061 if (buflen!=0) {
1062 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1063 tlv_type,
1064 tlv_len);
1065 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1066 }
1067 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
1068 while (ttlv_len>0) {
1069 ND_TCHECK(pptr[0]);
1070 if (buflen!=0) {
1071 stringlen=snprintf(buf,buflen, "%02x",*pptr++);
1072 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1073 }
1074 ttlv_len--;
1075 }
1076 break;
1077 default:
1078 if (buflen!=0) {
1079 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1080 tlv_type,
1081 tlv_len);
1082 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1083 }
1084 break;
1085 }
1086 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
1087 }
1088 return plen+2;
1089
1090 } else {
1091 /* complain bitterly ? */
1092 /* fall through */
1093 goto trunc;
1094 }
1095
1096 trunc:
1097 return -2;
1098 }
1099
1100 int
1101 decode_prefix6(netdissect_options *ndo,
1102 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1103 {
1104 struct in6_addr addr;
1105 u_int plen, plenbytes;
1106
1107 ND_TCHECK(pd[0]);
1108 ITEMCHECK(1);
1109 plen = pd[0];
1110 if (128 < plen)
1111 return -1;
1112 itemlen -= 1;
1113
1114 memset(&addr, 0, sizeof(addr));
1115 plenbytes = (plen + 7) / 8;
1116 ND_TCHECK2(pd[1], plenbytes);
1117 ITEMCHECK(plenbytes);
1118 memcpy(&addr, &pd[1], plenbytes);
1119 if (plen % 8) {
1120 addr.s6_addr[plenbytes - 1] &=
1121 ((0xff00 >> (plen % 8)) & 0xff);
1122 }
1123 snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen);
1124 return 1 + plenbytes;
1125
1126 trunc:
1127 return -2;
1128
1129 badtlv:
1130 return -3;
1131 }
1132
1133 static int
1134 decode_labeled_prefix6(netdissect_options *ndo,
1135 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1136 {
1137 struct in6_addr addr;
1138 u_int plen, plenbytes;
1139
1140 /* prefix length and label = 4 bytes */
1141 ND_TCHECK2(pptr[0], 4);
1142 ITEMCHECK(4);
1143 plen = pptr[0]; /* get prefix length */
1144
1145 if (24 > plen)
1146 return -1;
1147
1148 plen-=24; /* adjust prefixlen - labellength */
1149
1150 if (128 < plen)
1151 return -1;
1152 itemlen -= 4;
1153
1154 memset(&addr, 0, sizeof(addr));
1155 plenbytes = (plen + 7) / 8;
1156 ND_TCHECK2(pptr[4], plenbytes);
1157 memcpy(&addr, &pptr[4], plenbytes);
1158 if (plen % 8) {
1159 addr.s6_addr[plenbytes - 1] &=
1160 ((0xff00 >> (plen % 8)) & 0xff);
1161 }
1162 /* the label may get offsetted by 4 bits so lets shift it right */
1163 snprintf(buf, buflen, "%s/%d, label:%u %s",
1164 ip6addr_string(ndo, &addr),
1165 plen,
1166 EXTRACT_24BITS(pptr+1)>>4,
1167 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1168
1169 return 4 + plenbytes;
1170
1171 trunc:
1172 return -2;
1173
1174 badtlv:
1175 return -3;
1176 }
1177
1178 static int
1179 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1180 const u_char *pptr, char *buf, u_int buflen)
1181 {
1182 struct in6_addr addr;
1183 u_int plen;
1184
1185 ND_TCHECK(pptr[0]);
1186 plen = pptr[0]; /* get prefix length */
1187
1188 if ((24+64) > plen)
1189 return -1;
1190
1191 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1192
1193 if (128 < plen)
1194 return -1;
1195
1196 memset(&addr, 0, sizeof(addr));
1197 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1198 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1199 if (plen % 8) {
1200 addr.s6_addr[(plen + 7) / 8 - 1] &=
1201 ((0xff00 >> (plen % 8)) & 0xff);
1202 }
1203 /* the label may get offsetted by 4 bits so lets shift it right */
1204 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1205 bgp_vpn_rd_print(ndo, pptr+4),
1206 ip6addr_string(ndo, &addr),
1207 plen,
1208 EXTRACT_24BITS(pptr+1)>>4,
1209 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1210
1211 return 12 + (plen + 7) / 8;
1212
1213 trunc:
1214 return -2;
1215 }
1216
1217 static int
1218 decode_clnp_prefix(netdissect_options *ndo,
1219 const u_char *pptr, char *buf, u_int buflen)
1220 {
1221 uint8_t addr[19];
1222 u_int plen;
1223
1224 ND_TCHECK(pptr[0]);
1225 plen = pptr[0]; /* get prefix length */
1226
1227 if (152 < plen)
1228 return -1;
1229
1230 memset(&addr, 0, sizeof(addr));
1231 ND_TCHECK2(pptr[4], (plen + 7) / 8);
1232 memcpy(&addr, &pptr[4], (plen + 7) / 8);
1233 if (plen % 8) {
1234 addr[(plen + 7) / 8 - 1] &=
1235 ((0xff00 >> (plen % 8)) & 0xff);
1236 }
1237 snprintf(buf, buflen, "%s/%d",
1238 isonsap_string(ndo, addr,(plen + 7) / 8),
1239 plen);
1240
1241 return 1 + (plen + 7) / 8;
1242
1243 trunc:
1244 return -2;
1245 }
1246
1247 static int
1248 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1249 const u_char *pptr, char *buf, u_int buflen)
1250 {
1251 uint8_t addr[19];
1252 u_int plen;
1253
1254 ND_TCHECK(pptr[0]);
1255 plen = pptr[0]; /* get prefix length */
1256
1257 if ((24+64) > plen)
1258 return -1;
1259
1260 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1261
1262 if (152 < plen)
1263 return -1;
1264
1265 memset(&addr, 0, sizeof(addr));
1266 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1267 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1268 if (plen % 8) {
1269 addr[(plen + 7) / 8 - 1] &=
1270 ((0xff00 >> (plen % 8)) & 0xff);
1271 }
1272 /* the label may get offsetted by 4 bits so lets shift it right */
1273 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1274 bgp_vpn_rd_print(ndo, pptr+4),
1275 isonsap_string(ndo, addr,(plen + 7) / 8),
1276 plen,
1277 EXTRACT_24BITS(pptr+1)>>4,
1278 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1279
1280 return 12 + (plen + 7) / 8;
1281
1282 trunc:
1283 return -2;
1284 }
1285
1286 /*
1287 * bgp_attr_get_as_size
1288 *
1289 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1290 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1291 * support, exchange AS-Path with the same path-attribute type value 0x02.
1292 */
1293 static int
1294 bgp_attr_get_as_size(netdissect_options *ndo,
1295 uint8_t bgpa_type, const u_char *pptr, int len)
1296 {
1297 const u_char *tptr = pptr;
1298
1299 /*
1300 * If the path attribute is the optional AS4 path type, then we already
1301 * know, that ASs must be encoded in 4 byte format.
1302 */
1303 if (bgpa_type == BGPTYPE_AS4_PATH) {
1304 return 4;
1305 }
1306
1307 /*
1308 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1309 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1310 * each.
1311 */
1312 while (tptr < pptr + len) {
1313 ND_TCHECK(tptr[0]);
1314
1315 /*
1316 * If we do not find a valid segment type, our guess might be wrong.
1317 */
1318 if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) {
1319 goto trunc;
1320 }
1321 ND_TCHECK(tptr[1]);
1322 tptr += 2 + tptr[1] * 2;
1323 }
1324
1325 /*
1326 * If we correctly reached end of the AS path attribute data content,
1327 * then most likely ASs were indeed encoded as 2 bytes.
1328 */
1329 if (tptr == pptr + len) {
1330 return 2;
1331 }
1332
1333 trunc:
1334
1335 /*
1336 * We can come here, either we did not have enough data, or if we
1337 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1338 * so that calller can try to decode each AS as of 4 bytes. If indeed
1339 * there was not enough data, it will crib and end the parse anyways.
1340 */
1341 return 4;
1342 }
1343
1344 static int
1345 bgp_attr_print(netdissect_options *ndo,
1346 u_int atype, const u_char *pptr, u_int len)
1347 {
1348 int i;
1349 uint16_t af;
1350 uint8_t safi, snpa, nhlen;
1351 union { /* copy buffer for bandwidth values */
1352 float f;
1353 uint32_t i;
1354 } bw;
1355 int advance;
1356 u_int tlen;
1357 const u_char *tptr;
1358 char buf[MAXHOSTNAMELEN + 100];
1359 int as_size;
1360
1361 tptr = pptr;
1362 tlen=len;
1363
1364 switch (atype) {
1365 case BGPTYPE_ORIGIN:
1366 if (len != 1)
1367 ND_PRINT((ndo, "invalid len"));
1368 else {
1369 ND_TCHECK(*tptr);
1370 ND_PRINT((ndo, "%s", tok2str(bgp_origin_values,
1371 "Unknown Origin Typecode",
1372 tptr[0])));
1373 }
1374 break;
1375
1376 /*
1377 * Process AS4 byte path and AS2 byte path attributes here.
1378 */
1379 case BGPTYPE_AS4_PATH:
1380 case BGPTYPE_AS_PATH:
1381 if (len % 2) {
1382 ND_PRINT((ndo, "invalid len"));
1383 break;
1384 }
1385 if (!len) {
1386 ND_PRINT((ndo, "empty"));
1387 break;
1388 }
1389
1390 /*
1391 * BGP updates exchanged between New speakers that support 4
1392 * byte AS, ASs are always encoded in 4 bytes. There is no
1393 * definitive way to find this, just by the packet's
1394 * contents. So, check for packet's TLV's sanity assuming
1395 * 2 bytes first, and it does not pass, assume that ASs are
1396 * encoded in 4 bytes format and move on.
1397 */
1398 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1399
1400 while (tptr < pptr + len) {
1401 ND_TCHECK(tptr[0]);
1402 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values,
1403 "?", tptr[0])));
1404 for (i = 0; i < tptr[1] * as_size; i += as_size) {
1405 ND_TCHECK2(tptr[2 + i], as_size);
1406 ND_PRINT((ndo, "%s ",
1407 as_printf(ndo, astostr, sizeof(astostr),
1408 as_size == 2 ?
1409 EXTRACT_16BITS(&tptr[2 + i]) :
1410 EXTRACT_32BITS(&tptr[2 + i]))));
1411 }
1412 ND_TCHECK(tptr[0]);
1413 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values,
1414 "?", tptr[0])));
1415 ND_TCHECK(tptr[1]);
1416 tptr += 2 + tptr[1] * as_size;
1417 }
1418 break;
1419 case BGPTYPE_NEXT_HOP:
1420 if (len != 4)
1421 ND_PRINT((ndo, "invalid len"));
1422 else {
1423 ND_TCHECK2(tptr[0], 4);
1424 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1425 }
1426 break;
1427 case BGPTYPE_MULTI_EXIT_DISC:
1428 case BGPTYPE_LOCAL_PREF:
1429 if (len != 4)
1430 ND_PRINT((ndo, "invalid len"));
1431 else {
1432 ND_TCHECK2(tptr[0], 4);
1433 ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr)));
1434 }
1435 break;
1436 case BGPTYPE_ATOMIC_AGGREGATE:
1437 if (len != 0)
1438 ND_PRINT((ndo, "invalid len"));
1439 break;
1440 case BGPTYPE_AGGREGATOR:
1441
1442 /*
1443 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1444 * the length of this PA can be either 6 bytes or 8 bytes.
1445 */
1446 if (len != 6 && len != 8) {
1447 ND_PRINT((ndo, "invalid len"));
1448 break;
1449 }
1450 ND_TCHECK2(tptr[0], len);
1451 if (len == 6) {
1452 ND_PRINT((ndo, " AS #%s, origin %s",
1453 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)),
1454 ipaddr_string(ndo, tptr + 2)));
1455 } else {
1456 ND_PRINT((ndo, " AS #%s, origin %s",
1457 as_printf(ndo, astostr, sizeof(astostr),
1458 EXTRACT_32BITS(tptr)), ipaddr_string(ndo, tptr + 4)));
1459 }
1460 break;
1461 case BGPTYPE_AGGREGATOR4:
1462 if (len != 8) {
1463 ND_PRINT((ndo, "invalid len"));
1464 break;
1465 }
1466 ND_TCHECK2(tptr[0], 8);
1467 ND_PRINT((ndo, " AS #%s, origin %s",
1468 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)),
1469 ipaddr_string(ndo, tptr + 4)));
1470 break;
1471 case BGPTYPE_COMMUNITIES:
1472 if (len % 4) {
1473 ND_PRINT((ndo, "invalid len"));
1474 break;
1475 }
1476 while (tlen>0) {
1477 uint32_t comm;
1478 ND_TCHECK2(tptr[0], 4);
1479 comm = EXTRACT_32BITS(tptr);
1480 switch (comm) {
1481 case BGP_COMMUNITY_NO_EXPORT:
1482 ND_PRINT((ndo, " NO_EXPORT"));
1483 break;
1484 case BGP_COMMUNITY_NO_ADVERT:
1485 ND_PRINT((ndo, " NO_ADVERTISE"));
1486 break;
1487 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1488 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1489 break;
1490 default:
1491 ND_PRINT((ndo, "%u:%u%s",
1492 (comm >> 16) & 0xffff,
1493 comm & 0xffff,
1494 (tlen>4) ? ", " : ""));
1495 break;
1496 }
1497 tlen -=4;
1498 tptr +=4;
1499 }
1500 break;
1501 case BGPTYPE_ORIGINATOR_ID:
1502 if (len != 4) {
1503 ND_PRINT((ndo, "invalid len"));
1504 break;
1505 }
1506 ND_TCHECK2(tptr[0], 4);
1507 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1508 break;
1509 case BGPTYPE_CLUSTER_LIST:
1510 if (len % 4) {
1511 ND_PRINT((ndo, "invalid len"));
1512 break;
1513 }
1514 while (tlen>0) {
1515 ND_TCHECK2(tptr[0], 4);
1516 ND_PRINT((ndo, "%s%s",
1517 ipaddr_string(ndo, tptr),
1518 (tlen>4) ? ", " : ""));
1519 tlen -=4;
1520 tptr +=4;
1521 }
1522 break;
1523 case BGPTYPE_MP_REACH_NLRI:
1524 ND_TCHECK2(tptr[0], 3);
1525 af = EXTRACT_16BITS(tptr);
1526 safi = tptr[2];
1527
1528 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1529 tok2str(af_values, "Unknown AFI", af),
1530 af,
1531 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1532 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1533 safi));
1534
1535 switch(af<<8 | safi) {
1536 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1537 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1538 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1539 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1540 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1541 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1542 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1543 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1544 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1545 case (AFNUM_INET<<8 | SAFNUM_MDT):
1546 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1547 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1548 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1549 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1550 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1551 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1552 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1553 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1554 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1555 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1556 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1557 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1558 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1559 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1560 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1561 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1562 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1563 break;
1564 default:
1565 ND_TCHECK2(tptr[0], tlen);
1566 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1567 if (ndo->ndo_vflag <= 1)
1568 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1569 goto done;
1570 break;
1571 }
1572
1573 tptr +=3;
1574
1575 ND_TCHECK(tptr[0]);
1576 nhlen = tptr[0];
1577 tlen = nhlen;
1578 tptr++;
1579
1580 if (tlen) {
1581 int nnh = 0;
1582 ND_PRINT((ndo, "\n\t nexthop: "));
1583 while (tlen > 0) {
1584 if ( nnh++ > 0 ) {
1585 ND_PRINT((ndo, ", " ));
1586 }
1587 switch(af<<8 | safi) {
1588 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1589 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1590 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1591 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1592 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1593 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1594 case (AFNUM_INET<<8 | SAFNUM_MDT):
1595 if (tlen < (int)sizeof(struct in_addr)) {
1596 ND_PRINT((ndo, "invalid len"));
1597 tlen = 0;
1598 } else {
1599 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1600 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1601 tlen -= sizeof(struct in_addr);
1602 tptr += sizeof(struct in_addr);
1603 }
1604 break;
1605 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1606 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1607 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1608 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) {
1609 ND_PRINT((ndo, "invalid len"));
1610 tlen = 0;
1611 } else {
1612 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1613 ND_PRINT((ndo, "RD: %s, %s",
1614 bgp_vpn_rd_print(ndo, tptr),
1615 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1616 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1617 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1618 }
1619 break;
1620 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1621 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1622 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1623 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1624 if (tlen < (int)sizeof(struct in6_addr)) {
1625 ND_PRINT((ndo, "invalid len"));
1626 tlen = 0;
1627 } else {
1628 ND_TCHECK2(tptr[0], sizeof(struct in6_addr));
1629 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr)));
1630 tlen -= sizeof(struct in6_addr);
1631 tptr += sizeof(struct in6_addr);
1632 }
1633 break;
1634 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1635 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1636 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1637 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) {
1638 ND_PRINT((ndo, "invalid len"));
1639 tlen = 0;
1640 } else {
1641 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1642 ND_PRINT((ndo, "RD: %s, %s",
1643 bgp_vpn_rd_print(ndo, tptr),
1644 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1645 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1646 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1647 }
1648 break;
1649 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1650 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1651 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1652 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1653 if (tlen < (int)sizeof(struct in_addr)) {
1654 ND_PRINT((ndo, "invalid len"));
1655 tlen = 0;
1656 } else {
1657 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1658 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1659 tlen -= (sizeof(struct in_addr));
1660 tptr += (sizeof(struct in_addr));
1661 }
1662 break;
1663 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1664 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1665 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1666 ND_TCHECK2(tptr[0], tlen);
1667 ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen)));
1668 tptr += tlen;
1669 tlen = 0;
1670 break;
1671
1672 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1673 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1674 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1675 if (tlen < BGP_VPN_RD_LEN+1) {
1676 ND_PRINT((ndo, "invalid len"));
1677 tlen = 0;
1678 } else {
1679 ND_TCHECK2(tptr[0], tlen);
1680 ND_PRINT((ndo, "RD: %s, %s",
1681 bgp_vpn_rd_print(ndo, tptr),
1682 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1683 /* rfc986 mapped IPv4 address ? */
1684 if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601)
1685 ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4)));
1686 /* rfc1888 mapped IPv6 address ? */
1687 else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000)
1688 ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3)));
1689 tptr += tlen;
1690 tlen = 0;
1691 }
1692 break;
1693 default:
1694 ND_TCHECK2(tptr[0], tlen);
1695 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1696 if (ndo->ndo_vflag <= 1)
1697 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1698 tptr += tlen;
1699 tlen = 0;
1700 goto done;
1701 break;
1702 }
1703 }
1704 }
1705 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1706 tptr += tlen;
1707
1708 ND_TCHECK(tptr[0]);
1709 snpa = tptr[0];
1710 tptr++;
1711
1712 if (snpa) {
1713 ND_PRINT((ndo, "\n\t %u SNPA", snpa));
1714 for (/*nothing*/; snpa > 0; snpa--) {
1715 ND_TCHECK(tptr[0]);
1716 ND_PRINT((ndo, "\n\t %d bytes", tptr[0]));
1717 tptr += tptr[0] + 1;
1718 }
1719 } else {
1720 ND_PRINT((ndo, ", no SNPA"));
1721 }
1722
1723 while (len - (tptr - pptr) > 0) {
1724 switch (af<<8 | safi) {
1725 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1726 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1727 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1728 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1729 if (advance == -1)
1730 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1731 else if (advance == -2)
1732 goto trunc;
1733 else if (advance == -3)
1734 break; /* bytes left, but not enough */
1735 else
1736 ND_PRINT((ndo, "\n\t %s", buf));
1737 break;
1738 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1739 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1740 if (advance == -1)
1741 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1742 else if (advance == -2)
1743 goto trunc;
1744 else if (advance == -3)
1745 break; /* bytes left, but not enough */
1746 else
1747 ND_PRINT((ndo, "\n\t %s", buf));
1748 break;
1749 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1750 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1751 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1752 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1753 if (advance == -1)
1754 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1755 else if (advance == -2)
1756 goto trunc;
1757 else
1758 ND_PRINT((ndo, "\n\t %s", buf));
1759 break;
1760 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1761 advance = decode_rt_routing_info(ndo, tptr, 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
1767 ND_PRINT((ndo, "\n\t %s", buf));
1768 break;
1769 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1770 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1771 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1772 if (advance == -1)
1773 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1774 else if (advance == -2)
1775 goto trunc;
1776 else
1777 ND_PRINT((ndo, "\n\t %s", buf));
1778 break;
1779
1780 case (AFNUM_INET<<8 | SAFNUM_MDT):
1781 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1782 if (advance == -1)
1783 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1784 else if (advance == -2)
1785 goto trunc;
1786 else
1787 ND_PRINT((ndo, "\n\t %s", buf));
1788 break;
1789 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1790 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1791 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1792 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1793 if (advance == -1)
1794 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1795 else if (advance == -2)
1796 goto trunc;
1797 else if (advance == -3)
1798 break; /* bytes left, but not enough */
1799 else
1800 ND_PRINT((ndo, "\n\t %s", buf));
1801 break;
1802 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1803 advance = decode_labeled_prefix6(ndo, tptr, len, 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 if (advance == -3)
1809 break; /* bytes left, but not enough */
1810 else
1811 ND_PRINT((ndo, "\n\t %s", buf));
1812 break;
1813 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1814 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1815 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1816 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1817 if (advance == -1)
1818 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1819 else if (advance == -2)
1820 goto trunc;
1821 else
1822 ND_PRINT((ndo, "\n\t %s", buf));
1823 break;
1824 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1825 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1826 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1827 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1828 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1829 if (advance == -1)
1830 ND_PRINT((ndo, "\n\t (illegal length)"));
1831 else if (advance == -2)
1832 goto trunc;
1833 else
1834 ND_PRINT((ndo, "\n\t %s", buf));
1835 break;
1836 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1837 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1838 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1839 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1840 if (advance == -1)
1841 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1842 else if (advance == -2)
1843 goto trunc;
1844 else
1845 ND_PRINT((ndo, "\n\t %s", buf));
1846 break;
1847 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1848 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1849 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1850 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1851 if (advance == -1)
1852 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1853 else if (advance == -2)
1854 goto trunc;
1855 else
1856 ND_PRINT((ndo, "\n\t %s", buf));
1857 break;
1858 default:
1859 ND_TCHECK2(*tptr,tlen);
1860 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1861 if (ndo->ndo_vflag <= 1)
1862 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1863 advance = 0;
1864 tptr = pptr + len;
1865 break;
1866 }
1867 if (advance < 0)
1868 break;
1869 tptr += advance;
1870 }
1871 done:
1872 break;
1873
1874 case BGPTYPE_MP_UNREACH_NLRI:
1875 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE);
1876 af = EXTRACT_16BITS(tptr);
1877 safi = tptr[2];
1878
1879 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1880 tok2str(af_values, "Unknown AFI", af),
1881 af,
1882 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1883 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1884 safi));
1885
1886 if (len == BGP_MP_NLRI_MINSIZE)
1887 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
1888
1889 tptr += 3;
1890
1891 while (len - (tptr - pptr) > 0) {
1892 switch (af<<8 | safi) {
1893 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1894 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1895 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1896 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1897 if (advance == -1)
1898 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1899 else if (advance == -2)
1900 goto trunc;
1901 else if (advance == -3)
1902 break; /* bytes left, but not enough */
1903 else
1904 ND_PRINT((ndo, "\n\t %s", buf));
1905 break;
1906 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1907 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1908 if (advance == -1)
1909 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1910 else if (advance == -2)
1911 goto trunc;
1912 else if (advance == -3)
1913 break; /* bytes left, but not enough */
1914 else
1915 ND_PRINT((ndo, "\n\t %s", buf));
1916 break;
1917 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1918 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1919 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1920 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1921 if (advance == -1)
1922 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1923 else if (advance == -2)
1924 goto trunc;
1925 else
1926 ND_PRINT((ndo, "\n\t %s", buf));
1927 break;
1928 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1929 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1930 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1931 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1932 if (advance == -1)
1933 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1934 else if (advance == -2)
1935 goto trunc;
1936 else if (advance == -3)
1937 break; /* bytes left, but not enough */
1938 else
1939 ND_PRINT((ndo, "\n\t %s", buf));
1940 break;
1941 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1942 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1943 if (advance == -1)
1944 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1945 else if (advance == -2)
1946 goto trunc;
1947 else if (advance == -3)
1948 break; /* bytes left, but not enough */
1949 else
1950 ND_PRINT((ndo, "\n\t %s", buf));
1951 break;
1952 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1953 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1954 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1955 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1956 if (advance == -1)
1957 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1958 else if (advance == -2)
1959 goto trunc;
1960 else
1961 ND_PRINT((ndo, "\n\t %s", buf));
1962 break;
1963 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1964 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1965 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1966 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1967 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1968 if (advance == -1)
1969 ND_PRINT((ndo, "\n\t (illegal length)"));
1970 else if (advance == -2)
1971 goto trunc;
1972 else
1973 ND_PRINT((ndo, "\n\t %s", buf));
1974 break;
1975 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1976 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1977 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1978 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1979 if (advance == -1)
1980 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1981 else if (advance == -2)
1982 goto trunc;
1983 else
1984 ND_PRINT((ndo, "\n\t %s", buf));
1985 break;
1986 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1987 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1988 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1989 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1990 if (advance == -1)
1991 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1992 else if (advance == -2)
1993 goto trunc;
1994 else
1995 ND_PRINT((ndo, "\n\t %s", buf));
1996 break;
1997 case (AFNUM_INET<<8 | SAFNUM_MDT):
1998 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1999 if (advance == -1)
2000 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2001 else if (advance == -2)
2002 goto trunc;
2003 else
2004 ND_PRINT((ndo, "\n\t %s", buf));
2005 break;
2006 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
2007 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
2008 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
2009 if (advance == -1)
2010 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2011 else if (advance == -2)
2012 goto trunc;
2013 else
2014 ND_PRINT((ndo, "\n\t %s", buf));
2015 break;
2016 default:
2017 ND_TCHECK2(*(tptr-3),tlen);
2018 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
2019 if (ndo->ndo_vflag <= 1)
2020 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
2021 advance = 0;
2022 tptr = pptr + len;
2023 break;
2024 }
2025 if (advance < 0)
2026 break;
2027 tptr += advance;
2028 }
2029 break;
2030 case BGPTYPE_EXTD_COMMUNITIES:
2031 if (len % 8) {
2032 ND_PRINT((ndo, "invalid len"));
2033 break;
2034 }
2035 while (tlen>0) {
2036 uint16_t extd_comm;
2037
2038 ND_TCHECK2(tptr[0], 2);
2039 extd_comm=EXTRACT_16BITS(tptr);
2040
2041 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]",
2042 tok2str(bgp_extd_comm_subtype_values,
2043 "unknown extd community typecode",
2044 extd_comm),
2045 extd_comm,
2046 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2047
2048 ND_TCHECK2(*(tptr+2), 6);
2049 switch(extd_comm) {
2050 case BGP_EXT_COM_RT_0:
2051 case BGP_EXT_COM_RO_0:
2052 case BGP_EXT_COM_L2VPN_RT_0:
2053 ND_PRINT((ndo, ": %u:%u (= %s)",
2054 EXTRACT_16BITS(tptr+2),
2055 EXTRACT_32BITS(tptr+4),
2056 ipaddr_string(ndo, tptr+4)));
2057 break;
2058 case BGP_EXT_COM_RT_1:
2059 case BGP_EXT_COM_RO_1:
2060 case BGP_EXT_COM_L2VPN_RT_1:
2061 case BGP_EXT_COM_VRF_RT_IMP:
2062 ND_PRINT((ndo, ": %s:%u",
2063 ipaddr_string(ndo, tptr+2),
2064 EXTRACT_16BITS(tptr+6)));
2065 break;
2066 case BGP_EXT_COM_RT_2:
2067 case BGP_EXT_COM_RO_2:
2068 ND_PRINT((ndo, ": %s:%u",
2069 as_printf(ndo, astostr, sizeof(astostr),
2070 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6)));
2071 break;
2072 case BGP_EXT_COM_LINKBAND:
2073 bw.i = EXTRACT_32BITS(tptr+2);
2074 ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2075 bw.f*8/1000000));
2076 break;
2077 case BGP_EXT_COM_VPN_ORIGIN:
2078 case BGP_EXT_COM_VPN_ORIGIN2:
2079 case BGP_EXT_COM_VPN_ORIGIN3:
2080 case BGP_EXT_COM_VPN_ORIGIN4:
2081 case BGP_EXT_COM_OSPF_RID:
2082 case BGP_EXT_COM_OSPF_RID2:
2083 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2)));
2084 break;
2085 case BGP_EXT_COM_OSPF_RTYPE:
2086 case BGP_EXT_COM_OSPF_RTYPE2:
2087 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2088 ipaddr_string(ndo, tptr+2),
2089 tok2str(bgp_extd_comm_ospf_rtype_values,
2090 "unknown (0x%02x)",
2091 *(tptr+6)),
2092 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2093 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2094 break;
2095 case BGP_EXT_COM_L2INFO:
2096 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2097 tok2str(l2vpn_encaps_values,
2098 "unknown encaps",
2099 *(tptr+2)),
2100 *(tptr+3),
2101 EXTRACT_16BITS(tptr+4)));
2102 break;
2103 case BGP_EXT_COM_SOURCE_AS:
2104 ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2)));
2105 break;
2106 default:
2107 ND_TCHECK2(*tptr,8);
2108 print_unknown_data(ndo, tptr, "\n\t ", 8);
2109 break;
2110 }
2111 tlen -=8;
2112 tptr +=8;
2113 }
2114 break;
2115
2116 case BGPTYPE_PMSI_TUNNEL:
2117 {
2118 uint8_t tunnel_type, flags;
2119
2120 tunnel_type = *(tptr+1);
2121 flags = *tptr;
2122 tlen = len;
2123
2124 ND_TCHECK2(tptr[0], 5);
2125 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2126 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2127 tunnel_type,
2128 bittok2str(bgp_pmsi_flag_values, "none", flags),
2129 EXTRACT_24BITS(tptr+2)>>4));
2130
2131 tptr +=5;
2132 tlen -= 5;
2133
2134 switch (tunnel_type) {
2135 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2136 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2137 ND_TCHECK2(tptr[0], 8);
2138 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s",
2139 ipaddr_string(ndo, tptr),
2140 ipaddr_string(ndo, tptr+4)));
2141 break;
2142
2143 case BGP_PMSI_TUNNEL_PIM_SSM:
2144 ND_TCHECK2(tptr[0], 8);
2145 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s",
2146 ipaddr_string(ndo, tptr),
2147 ipaddr_string(ndo, tptr+4)));
2148 break;
2149 case BGP_PMSI_TUNNEL_INGRESS:
2150 ND_TCHECK2(tptr[0], 4);
2151 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s",
2152 ipaddr_string(ndo, tptr)));
2153 break;
2154 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2155 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2156 ND_TCHECK2(tptr[0], 8);
2157 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x",
2158 ipaddr_string(ndo, tptr),
2159 EXTRACT_32BITS(tptr+4)));
2160 break;
2161 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2162 ND_TCHECK2(tptr[0], 8);
2163 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2164 ipaddr_string(ndo, tptr),
2165 EXTRACT_32BITS(tptr+4)));
2166 break;
2167 default:
2168 if (ndo->ndo_vflag <= 1) {
2169 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2170 }
2171 }
2172 break;
2173 }
2174 case BGPTYPE_AIGP:
2175 {
2176 uint8_t type;
2177 uint16_t length;
2178
2179 ND_TCHECK2(tptr[0], 3);
2180
2181 tlen = len;
2182
2183 while (tlen >= 3) {
2184
2185 type = *tptr;
2186 length = EXTRACT_16BITS(tptr+1);
2187
2188 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u",
2189 tok2str(bgp_aigp_values, "Unknown", type),
2190 type, length));
2191
2192 /*
2193 * Check if we can read the TLV data.
2194 */
2195 ND_TCHECK2(tptr[3], length - 3);
2196
2197 switch (type) {
2198
2199 case BGP_AIGP_TLV:
2200 ND_TCHECK2(tptr[3], 8);
2201 ND_PRINT((ndo, ", metric %" PRIu64,
2202 EXTRACT_64BITS(tptr+3)));
2203 break;
2204
2205 default:
2206 if (ndo->ndo_vflag <= 1) {
2207 print_unknown_data(ndo, tptr+3,"\n\t ", length-3);
2208 }
2209 }
2210
2211 tptr += length;
2212 tlen -= length;
2213 }
2214 break;
2215 }
2216 case BGPTYPE_ATTR_SET:
2217 ND_TCHECK2(tptr[0], 4);
2218 if (len < 4)
2219 goto trunc;
2220 ND_PRINT((ndo, "\n\t Origin AS: %s",
2221 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr))));
2222 tptr+=4;
2223 len -=4;
2224
2225 while (len) {
2226 u_int aflags, alenlen, alen;
2227
2228 ND_TCHECK2(tptr[0], 2);
2229 if (len < 2)
2230 goto trunc;
2231 aflags = *tptr;
2232 atype = *(tptr + 1);
2233 tptr += 2;
2234 len -= 2;
2235 alenlen = bgp_attr_lenlen(aflags, tptr);
2236 ND_TCHECK2(tptr[0], alenlen);
2237 if (len < alenlen)
2238 goto trunc;
2239 alen = bgp_attr_len(aflags, tptr);
2240 tptr += alenlen;
2241 len -= alenlen;
2242
2243 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2244 tok2str(bgp_attr_values,
2245 "Unknown Attribute", atype),
2246 atype,
2247 alen));
2248
2249 if (aflags) {
2250 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2251 aflags & 0x80 ? "O" : "",
2252 aflags & 0x40 ? "T" : "",
2253 aflags & 0x20 ? "P" : "",
2254 aflags & 0x10 ? "E" : ""));
2255 if (aflags & 0xf)
2256 ND_PRINT((ndo, "+%x", aflags & 0xf));
2257 ND_PRINT((ndo, "]: "));
2258 }
2259 /* FIXME check for recursion */
2260 if (!bgp_attr_print(ndo, atype, tptr, alen))
2261 return 0;
2262 tptr += alen;
2263 len -= alen;
2264 }
2265 break;
2266
2267 case BGPTYPE_LARGE_COMMUNITY:
2268 if (len == 0 || len % 12) {
2269 ND_PRINT((ndo, "invalid len"));
2270 break;
2271 }
2272 ND_PRINT((ndo, "\n\t "));
2273 while (len > 0) {
2274 ND_TCHECK2(*tptr, 12);
2275 ND_PRINT((ndo, "%u:%u:%u%s",
2276 EXTRACT_32BITS(tptr),
2277 EXTRACT_32BITS(tptr + 4),
2278 EXTRACT_32BITS(tptr + 8),
2279 (len > 12) ? ", " : ""));
2280 tptr += 12;
2281 len -= 12;
2282 }
2283 break;
2284 default:
2285 ND_TCHECK2(*pptr,len);
2286 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2287 if (ndo->ndo_vflag <= 1)
2288 print_unknown_data(ndo, pptr, "\n\t ", len);
2289 break;
2290 }
2291 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2292 ND_TCHECK2(*pptr,len);
2293 print_unknown_data(ndo, pptr, "\n\t ", len);
2294 }
2295 return 1;
2296
2297 trunc:
2298 return 0;
2299 }
2300
2301 static void
2302 bgp_capabilities_print(netdissect_options *ndo,
2303 const u_char *opt, int caps_len)
2304 {
2305 int cap_type, cap_len, tcap_len, cap_offset;
2306 int i = 0;
2307
2308 while (i < caps_len) {
2309 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE);
2310 cap_type=opt[i];
2311 cap_len=opt[i+1];
2312 tcap_len=cap_len;
2313 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2314 tok2str(bgp_capcode_values, "Unknown",
2315 cap_type),
2316 cap_type,
2317 cap_len));
2318 ND_TCHECK2(opt[i+2], cap_len);
2319 switch (cap_type) {
2320 case BGP_CAPCODE_MP:
2321 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2322 tok2str(af_values, "Unknown",
2323 EXTRACT_16BITS(opt+i+2)),
2324 EXTRACT_16BITS(opt+i+2),
2325 tok2str(bgp_safi_values, "Unknown",
2326 opt[i+5]),
2327 opt[i+5]));
2328 break;
2329 case BGP_CAPCODE_RESTART:
2330 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2331 ((opt[i+2])&0x80) ? "R" : "none",
2332 EXTRACT_16BITS(opt+i+2)&0xfff));
2333 tcap_len-=2;
2334 cap_offset=4;
2335 while(tcap_len>=4) {
2336 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2337 tok2str(af_values,"Unknown",
2338 EXTRACT_16BITS(opt+i+cap_offset)),
2339 EXTRACT_16BITS(opt+i+cap_offset),
2340 tok2str(bgp_safi_values,"Unknown",
2341 opt[i+cap_offset+2]),
2342 opt[i+cap_offset+2],
2343 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" ));
2344 tcap_len-=4;
2345 cap_offset+=4;
2346 }
2347 break;
2348 case BGP_CAPCODE_RR:
2349 case BGP_CAPCODE_RR_CISCO:
2350 break;
2351 case BGP_CAPCODE_AS_NEW:
2352
2353 /*
2354 * Extract the 4 byte AS number encoded.
2355 */
2356 if (cap_len == 4) {
2357 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2358 as_printf(ndo, astostr, sizeof(astostr),
2359 EXTRACT_32BITS(opt + i + 2))));
2360 }
2361 break;
2362 case BGP_CAPCODE_ADD_PATH:
2363 cap_offset=2;
2364 if (tcap_len == 0) {
2365 ND_PRINT((ndo, " (bogus)")); /* length */
2366 break;
2367 }
2368 while (tcap_len > 0) {
2369 if (tcap_len < 4) {
2370 ND_PRINT((ndo, "\n\t\t(invalid)"));
2371 break;
2372 }
2373 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2374 tok2str(af_values,"Unknown",EXTRACT_16BITS(opt+i+cap_offset)),
2375 EXTRACT_16BITS(opt+i+cap_offset),
2376 tok2str(bgp_safi_values,"Unknown",opt[i+cap_offset+2]),
2377 opt[i+cap_offset+2],
2378 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",opt[i+cap_offset+3])
2379 ));
2380 tcap_len-=4;
2381 cap_offset+=4;
2382 }
2383 break;
2384 default:
2385 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2386 cap_type));
2387 if (ndo->ndo_vflag <= 1)
2388 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2389 break;
2390 }
2391 if (ndo->ndo_vflag > 1 && cap_len > 0) {
2392 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2393 }
2394 i += BGP_CAP_HEADER_SIZE + cap_len;
2395 }
2396 return;
2397
2398 trunc:
2399 ND_PRINT((ndo, "[|BGP]"));
2400 }
2401
2402 static void
2403 bgp_open_print(netdissect_options *ndo,
2404 const u_char *dat, int length)
2405 {
2406 struct bgp_open bgpo;
2407 struct bgp_opt bgpopt;
2408 const u_char *opt;
2409 int i;
2410
2411 ND_TCHECK2(dat[0], BGP_OPEN_SIZE);
2412 memcpy(&bgpo, dat, BGP_OPEN_SIZE);
2413
2414 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version));
2415 ND_PRINT((ndo, "my AS %s, ",
2416 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas))));
2417 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime)));
2418 ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgpo.bgpo_id)));
2419 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen));
2420
2421 /* some little sanity checking */
2422 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE)
2423 return;
2424
2425 /* ugly! */
2426 opt = &((const struct bgp_open *)dat)->bgpo_optlen;
2427 opt++;
2428
2429 i = 0;
2430 while (i < bgpo.bgpo_optlen) {
2431 ND_TCHECK2(opt[i], BGP_OPT_SIZE);
2432 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE);
2433 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
2434 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len));
2435 break;
2436 }
2437
2438 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u",
2439 tok2str(bgp_opt_values,"Unknown",
2440 bgpopt.bgpopt_type),
2441 bgpopt.bgpopt_type,
2442 bgpopt.bgpopt_len));
2443
2444 /* now let's decode the options we know*/
2445 switch(bgpopt.bgpopt_type) {
2446
2447 case BGP_OPT_CAP:
2448 bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE],
2449 bgpopt.bgpopt_len);
2450 break;
2451
2452 case BGP_OPT_AUTH:
2453 default:
2454 ND_PRINT((ndo, "\n\t no decoder for option %u",
2455 bgpopt.bgpopt_type));
2456 break;
2457 }
2458 i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
2459 }
2460 return;
2461 trunc:
2462 ND_PRINT((ndo, "[|BGP]"));
2463 }
2464
2465 static void
2466 bgp_update_print(netdissect_options *ndo,
2467 const u_char *dat, int length)
2468 {
2469 struct bgp bgp;
2470 const u_char *p;
2471 int withdrawn_routes_len;
2472 int len;
2473 int i;
2474
2475 ND_TCHECK2(dat[0], BGP_SIZE);
2476 if (length < BGP_SIZE)
2477 goto trunc;
2478 memcpy(&bgp, dat, BGP_SIZE);
2479 p = dat + BGP_SIZE; /*XXX*/
2480 length -= BGP_SIZE;
2481
2482 /* Unfeasible routes */
2483 ND_TCHECK2(p[0], 2);
2484 if (length < 2)
2485 goto trunc;
2486 withdrawn_routes_len = EXTRACT_16BITS(p);
2487 p += 2;
2488 length -= 2;
2489 if (withdrawn_routes_len) {
2490 /*
2491 * Without keeping state from the original NLRI message,
2492 * it's not possible to tell if this a v4 or v6 route,
2493 * so only try to decode it if we're not v6 enabled.
2494 */
2495 ND_TCHECK2(p[0], withdrawn_routes_len);
2496 if (length < withdrawn_routes_len)
2497 goto trunc;
2498 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len));
2499 p += withdrawn_routes_len;
2500 length -= withdrawn_routes_len;
2501 }
2502
2503 ND_TCHECK2(p[0], 2);
2504 if (length < 2)
2505 goto trunc;
2506 len = EXTRACT_16BITS(p);
2507 p += 2;
2508 length -= 2;
2509
2510 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2511 /* No withdrawn routes, no path attributes, no NLRI */
2512 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2513 return;
2514 }
2515
2516 if (len) {
2517 /* do something more useful!*/
2518 while (len) {
2519 int aflags, atype, alenlen, alen;
2520
2521 ND_TCHECK2(p[0], 2);
2522 if (len < 2)
2523 goto trunc;
2524 if (length < 2)
2525 goto trunc;
2526 aflags = *p;
2527 atype = *(p + 1);
2528 p += 2;
2529 len -= 2;
2530 length -= 2;
2531 alenlen = bgp_attr_lenlen(aflags, p);
2532 ND_TCHECK2(p[0], alenlen);
2533 if (len < alenlen)
2534 goto trunc;
2535 if (length < alenlen)
2536 goto trunc;
2537 alen = bgp_attr_len(aflags, p);
2538 p += alenlen;
2539 len -= alenlen;
2540 length -= alenlen;
2541
2542 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2543 tok2str(bgp_attr_values, "Unknown Attribute",
2544 atype),
2545 atype,
2546 alen));
2547
2548 if (aflags) {
2549 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2550 aflags & 0x80 ? "O" : "",
2551 aflags & 0x40 ? "T" : "",
2552 aflags & 0x20 ? "P" : "",
2553 aflags & 0x10 ? "E" : ""));
2554 if (aflags & 0xf)
2555 ND_PRINT((ndo, "+%x", aflags & 0xf));
2556 ND_PRINT((ndo, "]: "));
2557 }
2558 if (len < alen)
2559 goto trunc;
2560 if (length < alen)
2561 goto trunc;
2562 if (!bgp_attr_print(ndo, atype, p, alen))
2563 goto trunc;
2564 p += alen;
2565 len -= alen;
2566 length -= alen;
2567 }
2568 }
2569
2570 if (length) {
2571 /*
2572 * XXX - what if they're using the "Advertisement of
2573 * Multiple Paths in BGP" feature:
2574 *
2575 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/
2576 *
2577 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06
2578 */
2579 ND_PRINT((ndo, "\n\t Updated routes:"));
2580 while (length) {
2581 char buf[MAXHOSTNAMELEN + 100];
2582 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2583 if (i == -1) {
2584 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2585 break;
2586 } else if (i == -2)
2587 goto trunc;
2588 else if (i == -3)
2589 goto trunc; /* bytes left, but not enough */
2590 else {
2591 ND_PRINT((ndo, "\n\t %s", buf));
2592 p += i;
2593 length -= i;
2594 }
2595 }
2596 }
2597 return;
2598 trunc:
2599 ND_PRINT((ndo, "[|BGP]"));
2600 }
2601
2602 static void
2603 bgp_notification_print(netdissect_options *ndo,
2604 const u_char *dat, int length)
2605 {
2606 struct bgp_notification bgpn;
2607 const u_char *tptr;
2608
2609 ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
2610 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
2611
2612 /* some little sanity checking */
2613 if (length<BGP_NOTIFICATION_SIZE)
2614 return;
2615
2616 ND_PRINT((ndo, ", %s (%u)",
2617 tok2str(bgp_notify_major_values, "Unknown Error",
2618 bgpn.bgpn_major),
2619 bgpn.bgpn_major));
2620
2621 switch (bgpn.bgpn_major) {
2622
2623 case BGP_NOTIFY_MAJOR_MSG:
2624 ND_PRINT((ndo, ", subcode %s (%u)",
2625 tok2str(bgp_notify_minor_msg_values, "Unknown",
2626 bgpn.bgpn_minor),
2627 bgpn.bgpn_minor));
2628 break;
2629 case BGP_NOTIFY_MAJOR_OPEN:
2630 ND_PRINT((ndo, ", subcode %s (%u)",
2631 tok2str(bgp_notify_minor_open_values, "Unknown",
2632 bgpn.bgpn_minor),
2633 bgpn.bgpn_minor));
2634 break;
2635 case BGP_NOTIFY_MAJOR_UPDATE:
2636 ND_PRINT((ndo, ", subcode %s (%u)",
2637 tok2str(bgp_notify_minor_update_values, "Unknown",
2638 bgpn.bgpn_minor),
2639 bgpn.bgpn_minor));
2640 break;
2641 case BGP_NOTIFY_MAJOR_FSM:
2642 ND_PRINT((ndo, " subcode %s (%u)",
2643 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2644 bgpn.bgpn_minor),
2645 bgpn.bgpn_minor));
2646 break;
2647 case BGP_NOTIFY_MAJOR_CAP:
2648 ND_PRINT((ndo, " subcode %s (%u)",
2649 tok2str(bgp_notify_minor_cap_values, "Unknown",
2650 bgpn.bgpn_minor),
2651 bgpn.bgpn_minor));
2652 break;
2653 case BGP_NOTIFY_MAJOR_CEASE:
2654 ND_PRINT((ndo, ", subcode %s (%u)",
2655 tok2str(bgp_notify_minor_cease_values, "Unknown",
2656 bgpn.bgpn_minor),
2657 bgpn.bgpn_minor));
2658
2659 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2660 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2661 */
2662 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2663 tptr = dat + BGP_NOTIFICATION_SIZE;
2664 ND_TCHECK2(*tptr, 7);
2665 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2666 tok2str(af_values, "Unknown",
2667 EXTRACT_16BITS(tptr)),
2668 EXTRACT_16BITS(tptr),
2669 tok2str(bgp_safi_values, "Unknown", *(tptr+2)),
2670 *(tptr+2),
2671 EXTRACT_32BITS(tptr+3)));
2672 }
2673 break;
2674 default:
2675 break;
2676 }
2677
2678 return;
2679 trunc:
2680 ND_PRINT((ndo, "[|BGP]"));
2681 }
2682
2683 static void
2684 bgp_route_refresh_print(netdissect_options *ndo,
2685 const u_char *pptr, int len)
2686 {
2687 const struct bgp_route_refresh *bgp_route_refresh_header;
2688
2689 ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE);
2690
2691 /* some little sanity checking */
2692 if (len<BGP_ROUTE_REFRESH_SIZE)
2693 return;
2694
2695 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2696
2697 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)",
2698 tok2str(af_values,"Unknown",
2699 /* this stinks but the compiler pads the structure
2700 * weird */
2701 EXTRACT_16BITS(&bgp_route_refresh_header->afi)),
2702 EXTRACT_16BITS(&bgp_route_refresh_header->afi),
2703 tok2str(bgp_safi_values,"Unknown",
2704 bgp_route_refresh_header->safi),
2705 bgp_route_refresh_header->safi));
2706
2707 if (ndo->ndo_vflag > 1) {
2708 ND_TCHECK2(*pptr, len);
2709 print_unknown_data(ndo, pptr, "\n\t ", len);
2710 }
2711
2712 return;
2713 trunc:
2714 ND_PRINT((ndo, "[|BGP]"));
2715 }
2716
2717 static int
2718 bgp_header_print(netdissect_options *ndo,
2719 const u_char *dat, int length)
2720 {
2721 struct bgp bgp;
2722
2723 ND_TCHECK2(dat[0], BGP_SIZE);
2724 memcpy(&bgp, dat, BGP_SIZE);
2725 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2726 tok2str(bgp_msg_values, "Unknown", bgp.bgp_type),
2727 bgp.bgp_type,
2728 length));
2729
2730 switch (bgp.bgp_type) {
2731 case BGP_OPEN:
2732 bgp_open_print(ndo, dat, length);
2733 break;
2734 case BGP_UPDATE:
2735 bgp_update_print(ndo, dat, length);
2736 break;
2737 case BGP_NOTIFICATION:
2738 bgp_notification_print(ndo, dat, length);
2739 break;
2740 case BGP_KEEPALIVE:
2741 break;
2742 case BGP_ROUTE_REFRESH:
2743 bgp_route_refresh_print(ndo, dat, length);
2744 break;
2745 default:
2746 /* we have no decoder for the BGP message */
2747 ND_TCHECK2(*dat, length);
2748 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type));
2749 print_unknown_data(ndo, dat, "\n\t ", length);
2750 break;
2751 }
2752 return 1;
2753 trunc:
2754 ND_PRINT((ndo, "[|BGP]"));
2755 return 0;
2756 }
2757
2758 void
2759 bgp_print(netdissect_options *ndo,
2760 const u_char *dat, int length)
2761 {
2762 const u_char *p;
2763 const u_char *ep;
2764 const u_char *start;
2765 const u_char marker[] = {
2766 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2767 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2768 };
2769 struct bgp bgp;
2770 uint16_t hlen;
2771
2772 ep = dat + length;
2773 if (ndo->ndo_snapend < dat + length)
2774 ep = ndo->ndo_snapend;
2775
2776 ND_PRINT((ndo, ": BGP"));
2777
2778 if (ndo->ndo_vflag < 1) /* lets be less chatty */
2779 return;
2780
2781 p = dat;
2782 start = p;
2783 while (p < ep) {
2784 if (!ND_TTEST2(p[0], 1))
2785 break;
2786 if (p[0] != 0xff) {
2787 p++;
2788 continue;
2789 }
2790
2791 if (!ND_TTEST2(p[0], sizeof(marker)))
2792 break;
2793 if (memcmp(p, marker, sizeof(marker)) != 0) {
2794 p++;
2795 continue;
2796 }
2797
2798 /* found BGP header */
2799 ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/
2800 memcpy(&bgp, p, BGP_SIZE);
2801
2802 if (start != p)
2803 ND_PRINT((ndo, " [|BGP]"));
2804
2805 hlen = ntohs(bgp.bgp_len);
2806 if (hlen < BGP_SIZE) {
2807 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
2808 BGP_SIZE));
2809 break;
2810 }
2811
2812 if (ND_TTEST2(p[0], hlen)) {
2813 if (!bgp_header_print(ndo, p, hlen))
2814 return;
2815 p += hlen;
2816 start = p;
2817 } else {
2818 ND_PRINT((ndo, "\n[|BGP %s]",
2819 tok2str(bgp_msg_values,
2820 "Unknown Message Type",
2821 bgp.bgp_type)));
2822 break;
2823 }
2824 }
2825
2826 return;
2827
2828 trunc:
2829 ND_PRINT((ndo, " [|BGP]"));
2830 }
2831
2832 /*
2833 * Local Variables:
2834 * c-style: whitesmith
2835 * c-basic-offset: 4
2836 * End:
2837 */
[mirror] the TCPdump network dissector