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@juniper.net) 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 *
as_printf(netdissect_options * ndo,char * str,int size,u_int asnum)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
decode_prefix4(netdissect_options * ndo,const u_char * pptr,u_int itemlen,char * buf,u_int buflen)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
decode_labeled_prefix4(netdissect_options * ndo,const u_char * pptr,u_int itemlen,char * buf,u_int buflen)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 *
bgp_vpn_ip_print(netdissect_options * ndo,const u_char * pptr,u_int addr_length)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
bgp_vpn_sg_print(netdissect_options * ndo,const u_char * pptr,char * buf,u_int buflen)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 *
bgp_vpn_rd_print(netdissect_options * ndo,const u_char * pptr)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
decode_rt_routing_info(netdissect_options * ndo,const u_char * pptr,char * buf,u_int buflen)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
decode_labeled_vpn_prefix4(netdissect_options * ndo,const u_char * pptr,char * buf,u_int buflen)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
decode_mdt_vpn_nlri(netdissect_options * ndo,const u_char * pptr,char * buf,u_int buflen)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 };
899
900 static int
decode_multicast_vpn(netdissect_options * ndo,const u_char * pptr,char * buf,u_int buflen)901 decode_multicast_vpn(netdissect_options *ndo,
902 const u_char *pptr, char *buf, u_int buflen)
903 {
904 uint8_t route_type, route_length, addr_length, sg_length;
905 u_int offset;
906
907 ND_TCHECK2(pptr[0], 2);
908 route_type = *pptr++;
909 route_length = *pptr++;
910
911 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
912 tok2str(bgp_multicast_vpn_route_type_values,
913 "Unknown", route_type),
914 route_type, route_length);
915
916 switch(route_type) {
917 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
918 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
919 offset = strlen(buf);
920 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
921 bgp_vpn_rd_print(ndo, pptr),
922 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
923 (route_length - BGP_VPN_RD_LEN) << 3));
924 break;
925 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
926 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4);
927 offset = strlen(buf);
928 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
929 bgp_vpn_rd_print(ndo, pptr),
930 as_printf(ndo, astostr, sizeof(astostr),
931 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
932 break;
933
934 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
935 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
936 offset = strlen(buf);
937 snprintf(buf + offset, buflen - offset, ", RD: %s",
938 bgp_vpn_rd_print(ndo, pptr));
939 pptr += BGP_VPN_RD_LEN;
940
941 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
942 addr_length = route_length - sg_length;
943
944 ND_TCHECK2(pptr[0], addr_length);
945 offset = strlen(buf);
946 snprintf(buf + offset, buflen - offset, ", Originator %s",
947 bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
948 break;
949
950 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
951 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
952 offset = strlen(buf);
953 snprintf(buf + offset, buflen - offset, ", RD: %s",
954 bgp_vpn_rd_print(ndo, pptr));
955 pptr += BGP_VPN_RD_LEN;
956
957 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
958 break;
959
960 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
961 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
962 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
963 offset = strlen(buf);
964 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
965 bgp_vpn_rd_print(ndo, pptr),
966 as_printf(ndo, astostr, sizeof(astostr),
967 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
968 pptr += BGP_VPN_RD_LEN;
969
970 bgp_vpn_sg_print(ndo, pptr, buf, buflen);
971 break;
972
973 /*
974 * no per route-type printing yet.
975 */
976 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
977 default:
978 break;
979 }
980
981 return route_length + 2;
982
983 trunc:
984 return -2;
985 }
986
987 /*
988 * As I remember, some versions of systems have an snprintf() that
989 * returns -1 if the buffer would have overflowed. If the return
990 * value is negative, set buflen to 0, to indicate that we've filled
991 * the buffer up.
992 *
993 * If the return value is greater than buflen, that means that
994 * the buffer would have overflowed; again, set buflen to 0 in
995 * that case.
996 */
997 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
998 if (stringlen<0) \
999 buflen=0; \
1000 else if ((u_int)stringlen>buflen) \
1001 buflen=0; \
1002 else { \
1003 buflen-=stringlen; \
1004 buf+=stringlen; \
1005 }
1006
1007 static int
decode_labeled_vpn_l2(netdissect_options * ndo,const u_char * pptr,char * buf,u_int buflen)1008 decode_labeled_vpn_l2(netdissect_options *ndo,
1009 const u_char *pptr, char *buf, u_int buflen)
1010 {
1011 int plen,tlen,stringlen,tlv_type,tlv_len,ttlv_len;
1012
1013 ND_TCHECK2(pptr[0], 2);
1014 plen=EXTRACT_16BITS(pptr);
1015 tlen=plen;
1016 pptr+=2;
1017 /* Old and new L2VPN NLRI share AFI/SAFI
1018 * -> Assume a 12 Byte-length NLRI is auto-discovery-only
1019 * and > 17 as old format. Complain for the middle case
1020 */
1021 if (plen==12) {
1022 /* assume AD-only with RD, BGPNH */
1023 ND_TCHECK2(pptr[0],12);
1024 buf[0]='\0';
1025 stringlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1026 bgp_vpn_rd_print(ndo, pptr),
1027 ipaddr_string(ndo, pptr+8)
1028 );
1029 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1030 pptr+=12;
1031 tlen-=12;
1032 return plen;
1033 } else if (plen>17) {
1034 /* assume old format */
1035 /* RD, ID, LBLKOFF, LBLBASE */
1036
1037 ND_TCHECK2(pptr[0],15);
1038 buf[0]='\0';
1039 stringlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1040 bgp_vpn_rd_print(ndo, pptr),
1041 EXTRACT_16BITS(pptr+8),
1042 EXTRACT_16BITS(pptr+10),
1043 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1044 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1045 pptr+=15;
1046 tlen-=15;
1047
1048 /* ok now the variable part - lets read out TLVs*/
1049 while (tlen>0) {
1050 if (tlen < 3)
1051 return -1;
1052 ND_TCHECK2(pptr[0], 3);
1053 tlv_type=*pptr++;
1054 tlv_len=EXTRACT_16BITS(pptr);
1055 ttlv_len=tlv_len;
1056 pptr+=2;
1057
1058 switch(tlv_type) {
1059 case 1:
1060 if (buflen!=0) {
1061 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1062 tlv_type,
1063 tlv_len);
1064 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1065 }
1066 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
1067 while (ttlv_len>0) {
1068 ND_TCHECK(pptr[0]);
1069 if (buflen!=0) {
1070 stringlen=snprintf(buf,buflen, "%02x",*pptr++);
1071 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1072 }
1073 ttlv_len--;
1074 }
1075 break;
1076 default:
1077 if (buflen!=0) {
1078 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1079 tlv_type,
1080 tlv_len);
1081 UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1082 }
1083 break;
1084 }
1085 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
1086 }
1087 return plen+2;
1088
1089 } else {
1090 /* complain bitterly ? */
1091 /* fall through */
1092 goto trunc;
1093 }
1094
1095 trunc:
1096 return -2;
1097 }
1098
1099 int
decode_prefix6(netdissect_options * ndo,const u_char * pd,u_int itemlen,char * buf,u_int buflen)1100 decode_prefix6(netdissect_options *ndo,
1101 const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1102 {
1103 struct in6_addr addr;
1104 u_int plen, plenbytes;
1105
1106 ND_TCHECK(pd[0]);
1107 ITEMCHECK(1);
1108 plen = pd[0];
1109 if (128 < plen)
1110 return -1;
1111 itemlen -= 1;
1112
1113 memset(&addr, 0, sizeof(addr));
1114 plenbytes = (plen + 7) / 8;
1115 ND_TCHECK2(pd[1], plenbytes);
1116 ITEMCHECK(plenbytes);
1117 memcpy(&addr, &pd[1], plenbytes);
1118 if (plen % 8) {
1119 addr.s6_addr[plenbytes - 1] &=
1120 ((0xff00 >> (plen % 8)) & 0xff);
1121 }
1122 snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen);
1123 return 1 + plenbytes;
1124
1125 trunc:
1126 return -2;
1127
1128 badtlv:
1129 return -3;
1130 }
1131
1132 static int
decode_labeled_prefix6(netdissect_options * ndo,const u_char * pptr,u_int itemlen,char * buf,u_int buflen)1133 decode_labeled_prefix6(netdissect_options *ndo,
1134 const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1135 {
1136 struct in6_addr addr;
1137 u_int plen, plenbytes;
1138
1139 /* prefix length and label = 4 bytes */
1140 ND_TCHECK2(pptr[0], 4);
1141 ITEMCHECK(4);
1142 plen = pptr[0]; /* get prefix length */
1143
1144 if (24 > plen)
1145 return -1;
1146
1147 plen-=24; /* adjust prefixlen - labellength */
1148
1149 if (128 < plen)
1150 return -1;
1151 itemlen -= 4;
1152
1153 memset(&addr, 0, sizeof(addr));
1154 plenbytes = (plen + 7) / 8;
1155 ND_TCHECK2(pptr[4], plenbytes);
1156 memcpy(&addr, &pptr[4], plenbytes);
1157 if (plen % 8) {
1158 addr.s6_addr[plenbytes - 1] &=
1159 ((0xff00 >> (plen % 8)) & 0xff);
1160 }
1161 /* the label may get offsetted by 4 bits so lets shift it right */
1162 snprintf(buf, buflen, "%s/%d, label:%u %s",
1163 ip6addr_string(ndo, &addr),
1164 plen,
1165 EXTRACT_24BITS(pptr+1)>>4,
1166 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1167
1168 return 4 + plenbytes;
1169
1170 trunc:
1171 return -2;
1172
1173 badtlv:
1174 return -3;
1175 }
1176
1177 static int
decode_labeled_vpn_prefix6(netdissect_options * ndo,const u_char * pptr,char * buf,u_int buflen)1178 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1179 const u_char *pptr, char *buf, u_int buflen)
1180 {
1181 struct in6_addr addr;
1182 u_int plen;
1183
1184 ND_TCHECK(pptr[0]);
1185 plen = pptr[0]; /* get prefix length */
1186
1187 if ((24+64) > plen)
1188 return -1;
1189
1190 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1191
1192 if (128 < plen)
1193 return -1;
1194
1195 memset(&addr, 0, sizeof(addr));
1196 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1197 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1198 if (plen % 8) {
1199 addr.s6_addr[(plen + 7) / 8 - 1] &=
1200 ((0xff00 >> (plen % 8)) & 0xff);
1201 }
1202 /* the label may get offsetted by 4 bits so lets shift it right */
1203 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1204 bgp_vpn_rd_print(ndo, pptr+4),
1205 ip6addr_string(ndo, &addr),
1206 plen,
1207 EXTRACT_24BITS(pptr+1)>>4,
1208 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1209
1210 return 12 + (plen + 7) / 8;
1211
1212 trunc:
1213 return -2;
1214 }
1215
1216 static int
decode_clnp_prefix(netdissect_options * ndo,const u_char * pptr,char * buf,u_int buflen)1217 decode_clnp_prefix(netdissect_options *ndo,
1218 const u_char *pptr, char *buf, u_int buflen)
1219 {
1220 uint8_t addr[19];
1221 u_int plen;
1222
1223 ND_TCHECK(pptr[0]);
1224 plen = pptr[0]; /* get prefix length */
1225
1226 if (152 < plen)
1227 return -1;
1228
1229 memset(&addr, 0, sizeof(addr));
1230 ND_TCHECK2(pptr[4], (plen + 7) / 8);
1231 memcpy(&addr, &pptr[4], (plen + 7) / 8);
1232 if (plen % 8) {
1233 addr[(plen + 7) / 8 - 1] &=
1234 ((0xff00 >> (plen % 8)) & 0xff);
1235 }
1236 snprintf(buf, buflen, "%s/%d",
1237 isonsap_string(ndo, addr,(plen + 7) / 8),
1238 plen);
1239
1240 return 1 + (plen + 7) / 8;
1241
1242 trunc:
1243 return -2;
1244 }
1245
1246 static int
decode_labeled_vpn_clnp_prefix(netdissect_options * ndo,const u_char * pptr,char * buf,u_int buflen)1247 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1248 const u_char *pptr, char *buf, u_int buflen)
1249 {
1250 uint8_t addr[19];
1251 u_int plen;
1252
1253 ND_TCHECK(pptr[0]);
1254 plen = pptr[0]; /* get prefix length */
1255
1256 if ((24+64) > plen)
1257 return -1;
1258
1259 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1260
1261 if (152 < plen)
1262 return -1;
1263
1264 memset(&addr, 0, sizeof(addr));
1265 ND_TCHECK2(pptr[12], (plen + 7) / 8);
1266 memcpy(&addr, &pptr[12], (plen + 7) / 8);
1267 if (plen % 8) {
1268 addr[(plen + 7) / 8 - 1] &=
1269 ((0xff00 >> (plen % 8)) & 0xff);
1270 }
1271 /* the label may get offsetted by 4 bits so lets shift it right */
1272 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1273 bgp_vpn_rd_print(ndo, pptr+4),
1274 isonsap_string(ndo, addr,(plen + 7) / 8),
1275 plen,
1276 EXTRACT_24BITS(pptr+1)>>4,
1277 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1278
1279 return 12 + (plen + 7) / 8;
1280
1281 trunc:
1282 return -2;
1283 }
1284
1285 /*
1286 * bgp_attr_get_as_size
1287 *
1288 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1289 * both Old speakers that do not support 4 byte AS, and the new speakers that do
1290 * support, exchange AS-Path with the same path-attribute type value 0x02.
1291 */
1292 static int
bgp_attr_get_as_size(netdissect_options * ndo,uint8_t bgpa_type,const u_char * pptr,int len)1293 bgp_attr_get_as_size(netdissect_options *ndo,
1294 uint8_t bgpa_type, const u_char *pptr, int len)
1295 {
1296 const u_char *tptr = pptr;
1297
1298 /*
1299 * If the path attribute is the optional AS4 path type, then we already
1300 * know, that ASs must be encoded in 4 byte format.
1301 */
1302 if (bgpa_type == BGPTYPE_AS4_PATH) {
1303 return 4;
1304 }
1305
1306 /*
1307 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1308 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1309 * each.
1310 */
1311 while (tptr < pptr + len) {
1312 ND_TCHECK(tptr[0]);
1313
1314 /*
1315 * If we do not find a valid segment type, our guess might be wrong.
1316 */
1317 if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) {
1318 goto trunc;
1319 }
1320 ND_TCHECK(tptr[1]);
1321 tptr += 2 + tptr[1] * 2;
1322 }
1323
1324 /*
1325 * If we correctly reached end of the AS path attribute data content,
1326 * then most likely ASs were indeed encoded as 2 bytes.
1327 */
1328 if (tptr == pptr + len) {
1329 return 2;
1330 }
1331
1332 trunc:
1333
1334 /*
1335 * We can come here, either we did not have enough data, or if we
1336 * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1337 * so that calller can try to decode each AS as of 4 bytes. If indeed
1338 * there was not enough data, it will crib and end the parse anyways.
1339 */
1340 return 4;
1341 }
1342
1343 static int
bgp_attr_print(netdissect_options * ndo,u_int atype,const u_char * pptr,u_int len)1344 bgp_attr_print(netdissect_options *ndo,
1345 u_int atype, const u_char *pptr, u_int len)
1346 {
1347 int i;
1348 uint16_t af;
1349 uint8_t safi, snpa, nhlen;
1350 union { /* copy buffer for bandwidth values */
1351 float f;
1352 uint32_t i;
1353 } bw;
1354 int advance;
1355 u_int tlen;
1356 const u_char *tptr;
1357 char buf[MAXHOSTNAMELEN + 100];
1358 int as_size;
1359
1360 tptr = pptr;
1361 tlen=len;
1362
1363 switch (atype) {
1364 case BGPTYPE_ORIGIN:
1365 if (len != 1)
1366 ND_PRINT((ndo, "invalid len"));
1367 else {
1368 ND_TCHECK(*tptr);
1369 ND_PRINT((ndo, "%s", tok2str(bgp_origin_values,
1370 "Unknown Origin Typecode",
1371 tptr[0])));
1372 }
1373 break;
1374
1375 /*
1376 * Process AS4 byte path and AS2 byte path attributes here.
1377 */
1378 case BGPTYPE_AS4_PATH:
1379 case BGPTYPE_AS_PATH:
1380 if (len % 2) {
1381 ND_PRINT((ndo, "invalid len"));
1382 break;
1383 }
1384 if (!len) {
1385 ND_PRINT((ndo, "empty"));
1386 break;
1387 }
1388
1389 /*
1390 * BGP updates exchanged between New speakers that support 4
1391 * byte AS, ASs are always encoded in 4 bytes. There is no
1392 * definitive way to find this, just by the packet's
1393 * contents. So, check for packet's TLV's sanity assuming
1394 * 2 bytes first, and it does not pass, assume that ASs are
1395 * encoded in 4 bytes format and move on.
1396 */
1397 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1398
1399 while (tptr < pptr + len) {
1400 ND_TCHECK(tptr[0]);
1401 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values,
1402 "?", tptr[0])));
1403 for (i = 0; i < tptr[1] * as_size; i += as_size) {
1404 ND_TCHECK2(tptr[2 + i], as_size);
1405 ND_PRINT((ndo, "%s ",
1406 as_printf(ndo, astostr, sizeof(astostr),
1407 as_size == 2 ?
1408 EXTRACT_16BITS(&tptr[2 + i]) :
1409 EXTRACT_32BITS(&tptr[2 + i]))));
1410 }
1411 ND_TCHECK(tptr[0]);
1412 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values,
1413 "?", tptr[0])));
1414 ND_TCHECK(tptr[1]);
1415 tptr += 2 + tptr[1] * as_size;
1416 }
1417 break;
1418 case BGPTYPE_NEXT_HOP:
1419 if (len != 4)
1420 ND_PRINT((ndo, "invalid len"));
1421 else {
1422 ND_TCHECK2(tptr[0], 4);
1423 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1424 }
1425 break;
1426 case BGPTYPE_MULTI_EXIT_DISC:
1427 case BGPTYPE_LOCAL_PREF:
1428 if (len != 4)
1429 ND_PRINT((ndo, "invalid len"));
1430 else {
1431 ND_TCHECK2(tptr[0], 4);
1432 ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr)));
1433 }
1434 break;
1435 case BGPTYPE_ATOMIC_AGGREGATE:
1436 if (len != 0)
1437 ND_PRINT((ndo, "invalid len"));
1438 break;
1439 case BGPTYPE_AGGREGATOR:
1440
1441 /*
1442 * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1443 * the length of this PA can be either 6 bytes or 8 bytes.
1444 */
1445 if (len != 6 && len != 8) {
1446 ND_PRINT((ndo, "invalid len"));
1447 break;
1448 }
1449 ND_TCHECK2(tptr[0], len);
1450 if (len == 6) {
1451 ND_PRINT((ndo, " AS #%s, origin %s",
1452 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)),
1453 ipaddr_string(ndo, tptr + 2)));
1454 } else {
1455 ND_PRINT((ndo, " AS #%s, origin %s",
1456 as_printf(ndo, astostr, sizeof(astostr),
1457 EXTRACT_32BITS(tptr)), ipaddr_string(ndo, tptr + 4)));
1458 }
1459 break;
1460 case BGPTYPE_AGGREGATOR4:
1461 if (len != 8) {
1462 ND_PRINT((ndo, "invalid len"));
1463 break;
1464 }
1465 ND_TCHECK2(tptr[0], 8);
1466 ND_PRINT((ndo, " AS #%s, origin %s",
1467 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)),
1468 ipaddr_string(ndo, tptr + 4)));
1469 break;
1470 case BGPTYPE_COMMUNITIES:
1471 if (len % 4) {
1472 ND_PRINT((ndo, "invalid len"));
1473 break;
1474 }
1475 while (tlen>0) {
1476 uint32_t comm;
1477 ND_TCHECK2(tptr[0], 4);
1478 comm = EXTRACT_32BITS(tptr);
1479 switch (comm) {
1480 case BGP_COMMUNITY_NO_EXPORT:
1481 ND_PRINT((ndo, " NO_EXPORT"));
1482 break;
1483 case BGP_COMMUNITY_NO_ADVERT:
1484 ND_PRINT((ndo, " NO_ADVERTISE"));
1485 break;
1486 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1487 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1488 break;
1489 default:
1490 ND_PRINT((ndo, "%u:%u%s",
1491 (comm >> 16) & 0xffff,
1492 comm & 0xffff,
1493 (tlen>4) ? ", " : ""));
1494 break;
1495 }
1496 tlen -=4;
1497 tptr +=4;
1498 }
1499 break;
1500 case BGPTYPE_ORIGINATOR_ID:
1501 if (len != 4) {
1502 ND_PRINT((ndo, "invalid len"));
1503 break;
1504 }
1505 ND_TCHECK2(tptr[0], 4);
1506 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1507 break;
1508 case BGPTYPE_CLUSTER_LIST:
1509 if (len % 4) {
1510 ND_PRINT((ndo, "invalid len"));
1511 break;
1512 }
1513 while (tlen>0) {
1514 ND_TCHECK2(tptr[0], 4);
1515 ND_PRINT((ndo, "%s%s",
1516 ipaddr_string(ndo, tptr),
1517 (tlen>4) ? ", " : ""));
1518 tlen -=4;
1519 tptr +=4;
1520 }
1521 break;
1522 case BGPTYPE_MP_REACH_NLRI:
1523 ND_TCHECK2(tptr[0], 3);
1524 af = EXTRACT_16BITS(tptr);
1525 safi = tptr[2];
1526
1527 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1528 tok2str(af_values, "Unknown AFI", af),
1529 af,
1530 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1531 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1532 safi));
1533
1534 switch(af<<8 | safi) {
1535 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1536 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1537 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1538 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1539 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1540 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1541 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1542 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1543 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1544 case (AFNUM_INET<<8 | SAFNUM_MDT):
1545 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1546 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1547 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1548 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1549 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1550 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1551 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1552 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1553 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1554 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1555 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1556 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1557 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1558 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1559 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1560 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1561 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1562 break;
1563 default:
1564 ND_TCHECK2(tptr[0], tlen);
1565 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1566 if (ndo->ndo_vflag <= 1)
1567 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1568 goto done;
1569 break;
1570 }
1571
1572 tptr +=3;
1573
1574 ND_TCHECK(tptr[0]);
1575 nhlen = tptr[0];
1576 tlen = nhlen;
1577 tptr++;
1578
1579 if (tlen) {
1580 int nnh = 0;
1581 ND_PRINT((ndo, "\n\t nexthop: "));
1582 while (tlen > 0) {
1583 if ( nnh++ > 0 ) {
1584 ND_PRINT((ndo, ", " ));
1585 }
1586 switch(af<<8 | safi) {
1587 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1588 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1589 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1590 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1591 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1592 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1593 case (AFNUM_INET<<8 | SAFNUM_MDT):
1594 if (tlen < (int)sizeof(struct in_addr)) {
1595 ND_PRINT((ndo, "invalid len"));
1596 tlen = 0;
1597 } else {
1598 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1599 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1600 tlen -= sizeof(struct in_addr);
1601 tptr += sizeof(struct in_addr);
1602 }
1603 break;
1604 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1605 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1606 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1607 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) {
1608 ND_PRINT((ndo, "invalid len"));
1609 tlen = 0;
1610 } else {
1611 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1612 ND_PRINT((ndo, "RD: %s, %s",
1613 bgp_vpn_rd_print(ndo, tptr),
1614 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1615 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1616 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1617 }
1618 break;
1619 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1620 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1621 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1622 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1623 if (tlen < (int)sizeof(struct in6_addr)) {
1624 ND_PRINT((ndo, "invalid len"));
1625 tlen = 0;
1626 } else {
1627 ND_TCHECK2(tptr[0], sizeof(struct in6_addr));
1628 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr)));
1629 tlen -= sizeof(struct in6_addr);
1630 tptr += sizeof(struct in6_addr);
1631 }
1632 break;
1633 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1634 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1635 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1636 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) {
1637 ND_PRINT((ndo, "invalid len"));
1638 tlen = 0;
1639 } else {
1640 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1641 ND_PRINT((ndo, "RD: %s, %s",
1642 bgp_vpn_rd_print(ndo, tptr),
1643 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1644 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1645 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1646 }
1647 break;
1648 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1649 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1650 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1651 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1652 if (tlen < (int)sizeof(struct in_addr)) {
1653 ND_PRINT((ndo, "invalid len"));
1654 tlen = 0;
1655 } else {
1656 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1657 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1658 tlen -= (sizeof(struct in_addr));
1659 tptr += (sizeof(struct in_addr));
1660 }
1661 break;
1662 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1663 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1664 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1665 ND_TCHECK2(tptr[0], tlen);
1666 ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen)));
1667 tptr += tlen;
1668 tlen = 0;
1669 break;
1670
1671 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1672 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1673 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1674 if (tlen < BGP_VPN_RD_LEN+1) {
1675 ND_PRINT((ndo, "invalid len"));
1676 tlen = 0;
1677 } else {
1678 ND_TCHECK2(tptr[0], tlen);
1679 ND_PRINT((ndo, "RD: %s, %s",
1680 bgp_vpn_rd_print(ndo, tptr),
1681 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1682 /* rfc986 mapped IPv4 address ? */
1683 if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601)
1684 ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4)));
1685 /* rfc1888 mapped IPv6 address ? */
1686 else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000)
1687 ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3)));
1688 tptr += tlen;
1689 tlen = 0;
1690 }
1691 break;
1692 default:
1693 ND_TCHECK2(tptr[0], tlen);
1694 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1695 if (ndo->ndo_vflag <= 1)
1696 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1697 tptr += tlen;
1698 tlen = 0;
1699 goto done;
1700 break;
1701 }
1702 }
1703 }
1704 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1705 tptr += tlen;
1706
1707 ND_TCHECK(tptr[0]);
1708 snpa = tptr[0];
1709 tptr++;
1710
1711 if (snpa) {
1712 ND_PRINT((ndo, "\n\t %u SNPA", snpa));
1713 for (/*nothing*/; snpa > 0; snpa--) {
1714 ND_TCHECK(tptr[0]);
1715 ND_PRINT((ndo, "\n\t %d bytes", tptr[0]));
1716 tptr += tptr[0] + 1;
1717 }
1718 } else {
1719 ND_PRINT((ndo, ", no SNPA"));
1720 }
1721
1722 while (len - (tptr - pptr) > 0) {
1723 switch (af<<8 | safi) {
1724 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1725 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1726 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1727 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1728 if (advance == -1)
1729 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1730 else if (advance == -2)
1731 goto trunc;
1732 else if (advance == -3)
1733 break; /* bytes left, but not enough */
1734 else
1735 ND_PRINT((ndo, "\n\t %s", buf));
1736 break;
1737 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1738 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1739 if (advance == -1)
1740 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1741 else if (advance == -2)
1742 goto trunc;
1743 else if (advance == -3)
1744 break; /* bytes left, but not enough */
1745 else
1746 ND_PRINT((ndo, "\n\t %s", buf));
1747 break;
1748 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1749 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1750 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1751 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1752 if (advance == -1)
1753 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1754 else if (advance == -2)
1755 goto trunc;
1756 else
1757 ND_PRINT((ndo, "\n\t %s", buf));
1758 break;
1759 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1760 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf));
1761 if (advance == -1)
1762 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1763 else if (advance == -2)
1764 goto trunc;
1765 else
1766 ND_PRINT((ndo, "\n\t %s", buf));
1767 break;
1768 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1769 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1770 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1771 if (advance == -1)
1772 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1773 else if (advance == -2)
1774 goto trunc;
1775 else
1776 ND_PRINT((ndo, "\n\t %s", buf));
1777 break;
1778
1779 case (AFNUM_INET<<8 | SAFNUM_MDT):
1780 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1781 if (advance == -1)
1782 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1783 else if (advance == -2)
1784 goto trunc;
1785 else
1786 ND_PRINT((ndo, "\n\t %s", buf));
1787 break;
1788 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1789 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1790 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1791 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1792 if (advance == -1)
1793 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1794 else if (advance == -2)
1795 goto trunc;
1796 else if (advance == -3)
1797 break; /* bytes left, but not enough */
1798 else
1799 ND_PRINT((ndo, "\n\t %s", buf));
1800 break;
1801 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1802 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1803 if (advance == -1)
1804 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1805 else if (advance == -2)
1806 goto trunc;
1807 else if (advance == -3)
1808 break; /* bytes left, but not enough */
1809 else
1810 ND_PRINT((ndo, "\n\t %s", buf));
1811 break;
1812 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1813 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1814 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1815 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1816 if (advance == -1)
1817 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1818 else if (advance == -2)
1819 goto trunc;
1820 else
1821 ND_PRINT((ndo, "\n\t %s", buf));
1822 break;
1823 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1824 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1825 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1826 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1827 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1828 if (advance == -1)
1829 ND_PRINT((ndo, "\n\t (illegal length)"));
1830 else if (advance == -2)
1831 goto trunc;
1832 else
1833 ND_PRINT((ndo, "\n\t %s", buf));
1834 break;
1835 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1836 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1837 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1838 advance = decode_clnp_prefix(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_NSAP<<8 | SAFNUM_VPNUNICAST):
1847 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1848 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1849 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1850 if (advance == -1)
1851 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1852 else if (advance == -2)
1853 goto trunc;
1854 else
1855 ND_PRINT((ndo, "\n\t %s", buf));
1856 break;
1857 default:
1858 ND_TCHECK2(*tptr,tlen);
1859 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi));
1860 if (ndo->ndo_vflag <= 1)
1861 print_unknown_data(ndo, tptr, "\n\t ", tlen);
1862 advance = 0;
1863 tptr = pptr + len;
1864 break;
1865 }
1866 if (advance < 0)
1867 break;
1868 tptr += advance;
1869 }
1870 done:
1871 break;
1872
1873 case BGPTYPE_MP_UNREACH_NLRI:
1874 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE);
1875 af = EXTRACT_16BITS(tptr);
1876 safi = tptr[2];
1877
1878 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1879 tok2str(af_values, "Unknown AFI", af),
1880 af,
1881 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1882 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1883 safi));
1884
1885 if (len == BGP_MP_NLRI_MINSIZE)
1886 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
1887
1888 tptr += 3;
1889
1890 while (len - (tptr - pptr) > 0) {
1891 switch (af<<8 | safi) {
1892 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1893 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1894 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1895 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1896 if (advance == -1)
1897 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1898 else if (advance == -2)
1899 goto trunc;
1900 else if (advance == -3)
1901 break; /* bytes left, but not enough */
1902 else
1903 ND_PRINT((ndo, "\n\t %s", buf));
1904 break;
1905 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1906 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1907 if (advance == -1)
1908 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1909 else if (advance == -2)
1910 goto trunc;
1911 else if (advance == -3)
1912 break; /* bytes left, but not enough */
1913 else
1914 ND_PRINT((ndo, "\n\t %s", buf));
1915 break;
1916 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1917 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1918 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1919 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1920 if (advance == -1)
1921 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1922 else if (advance == -2)
1923 goto trunc;
1924 else
1925 ND_PRINT((ndo, "\n\t %s", buf));
1926 break;
1927 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1928 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1929 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1930 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1931 if (advance == -1)
1932 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1933 else if (advance == -2)
1934 goto trunc;
1935 else if (advance == -3)
1936 break; /* bytes left, but not enough */
1937 else
1938 ND_PRINT((ndo, "\n\t %s", buf));
1939 break;
1940 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1941 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1942 if (advance == -1)
1943 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1944 else if (advance == -2)
1945 goto trunc;
1946 else if (advance == -3)
1947 break; /* bytes left, but not enough */
1948 else
1949 ND_PRINT((ndo, "\n\t %s", buf));
1950 break;
1951 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1952 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1953 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1954 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1955 if (advance == -1)
1956 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1957 else if (advance == -2)
1958 goto trunc;
1959 else
1960 ND_PRINT((ndo, "\n\t %s", buf));
1961 break;
1962 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1963 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1964 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1965 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1966 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1967 if (advance == -1)
1968 ND_PRINT((ndo, "\n\t (illegal length)"));
1969 else if (advance == -2)
1970 goto trunc;
1971 else
1972 ND_PRINT((ndo, "\n\t %s", buf));
1973 break;
1974 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1975 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1976 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1977 advance = decode_clnp_prefix(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_NSAP<<8 | SAFNUM_VPNUNICAST):
1986 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1987 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1988 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1989 if (advance == -1)
1990 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
1991 else if (advance == -2)
1992 goto trunc;
1993 else
1994 ND_PRINT((ndo, "\n\t %s", buf));
1995 break;
1996 case (AFNUM_INET<<8 | SAFNUM_MDT):
1997 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1998 if (advance == -1)
1999 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2000 else if (advance == -2)
2001 goto trunc;
2002 else
2003 ND_PRINT((ndo, "\n\t %s", buf));
2004 break;
2005 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
2006 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
2007 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
2008 if (advance == -1)
2009 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2010 else if (advance == -2)
2011 goto trunc;
2012 else
2013 ND_PRINT((ndo, "\n\t %s", buf));
2014 break;
2015 default:
2016 ND_TCHECK2(*(tptr-3),tlen);
2017 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
2018 if (ndo->ndo_vflag <= 1)
2019 print_unknown_data(ndo, tptr-3, "\n\t ", tlen);
2020 advance = 0;
2021 tptr = pptr + len;
2022 break;
2023 }
2024 if (advance < 0)
2025 break;
2026 tptr += advance;
2027 }
2028 break;
2029 case BGPTYPE_EXTD_COMMUNITIES:
2030 if (len % 8) {
2031 ND_PRINT((ndo, "invalid len"));
2032 break;
2033 }
2034 while (tlen>0) {
2035 uint16_t extd_comm;
2036
2037 ND_TCHECK2(tptr[0], 2);
2038 extd_comm=EXTRACT_16BITS(tptr);
2039
2040 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]",
2041 tok2str(bgp_extd_comm_subtype_values,
2042 "unknown extd community typecode",
2043 extd_comm),
2044 extd_comm,
2045 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2046
2047 ND_TCHECK2(*(tptr+2), 6);
2048 switch(extd_comm) {
2049 case BGP_EXT_COM_RT_0:
2050 case BGP_EXT_COM_RO_0:
2051 case BGP_EXT_COM_L2VPN_RT_0:
2052 ND_PRINT((ndo, ": %u:%u (= %s)",
2053 EXTRACT_16BITS(tptr+2),
2054 EXTRACT_32BITS(tptr+4),
2055 ipaddr_string(ndo, tptr+4)));
2056 break;
2057 case BGP_EXT_COM_RT_1:
2058 case BGP_EXT_COM_RO_1:
2059 case BGP_EXT_COM_L2VPN_RT_1:
2060 case BGP_EXT_COM_VRF_RT_IMP:
2061 ND_PRINT((ndo, ": %s:%u",
2062 ipaddr_string(ndo, tptr+2),
2063 EXTRACT_16BITS(tptr+6)));
2064 break;
2065 case BGP_EXT_COM_RT_2:
2066 case BGP_EXT_COM_RO_2:
2067 ND_PRINT((ndo, ": %s:%u",
2068 as_printf(ndo, astostr, sizeof(astostr),
2069 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6)));
2070 break;
2071 case BGP_EXT_COM_LINKBAND:
2072 bw.i = EXTRACT_32BITS(tptr+2);
2073 ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2074 bw.f*8/1000000));
2075 break;
2076 case BGP_EXT_COM_VPN_ORIGIN:
2077 case BGP_EXT_COM_VPN_ORIGIN2:
2078 case BGP_EXT_COM_VPN_ORIGIN3:
2079 case BGP_EXT_COM_VPN_ORIGIN4:
2080 case BGP_EXT_COM_OSPF_RID:
2081 case BGP_EXT_COM_OSPF_RID2:
2082 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2)));
2083 break;
2084 case BGP_EXT_COM_OSPF_RTYPE:
2085 case BGP_EXT_COM_OSPF_RTYPE2:
2086 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2087 ipaddr_string(ndo, tptr+2),
2088 tok2str(bgp_extd_comm_ospf_rtype_values,
2089 "unknown (0x%02x)",
2090 *(tptr+6)),
2091 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2092 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2093 break;
2094 case BGP_EXT_COM_L2INFO:
2095 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2096 tok2str(l2vpn_encaps_values,
2097 "unknown encaps",
2098 *(tptr+2)),
2099 *(tptr+3),
2100 EXTRACT_16BITS(tptr+4)));
2101 break;
2102 case BGP_EXT_COM_SOURCE_AS:
2103 ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2)));
2104 break;
2105 default:
2106 ND_TCHECK2(*tptr,8);
2107 print_unknown_data(ndo, tptr, "\n\t ", 8);
2108 break;
2109 }
2110 tlen -=8;
2111 tptr +=8;
2112 }
2113 break;
2114
2115 case BGPTYPE_PMSI_TUNNEL:
2116 {
2117 uint8_t tunnel_type, flags;
2118
2119 tunnel_type = *(tptr+1);
2120 flags = *tptr;
2121 tlen = len;
2122
2123 ND_TCHECK2(tptr[0], 5);
2124 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2125 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2126 tunnel_type,
2127 bittok2str(bgp_pmsi_flag_values, "none", flags),
2128 EXTRACT_24BITS(tptr+2)>>4));
2129
2130 tptr +=5;
2131 tlen -= 5;
2132
2133 switch (tunnel_type) {
2134 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2135 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2136 ND_TCHECK2(tptr[0], 8);
2137 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s",
2138 ipaddr_string(ndo, tptr),
2139 ipaddr_string(ndo, tptr+4)));
2140 break;
2141
2142 case BGP_PMSI_TUNNEL_PIM_SSM:
2143 ND_TCHECK2(tptr[0], 8);
2144 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s",
2145 ipaddr_string(ndo, tptr),
2146 ipaddr_string(ndo, tptr+4)));
2147 break;
2148 case BGP_PMSI_TUNNEL_INGRESS:
2149 ND_TCHECK2(tptr[0], 4);
2150 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s",
2151 ipaddr_string(ndo, tptr)));
2152 break;
2153 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2154 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2155 ND_TCHECK2(tptr[0], 8);
2156 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x",
2157 ipaddr_string(ndo, tptr),
2158 EXTRACT_32BITS(tptr+4)));
2159 break;
2160 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2161 ND_TCHECK2(tptr[0], 8);
2162 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2163 ipaddr_string(ndo, tptr),
2164 EXTRACT_32BITS(tptr+4)));
2165 break;
2166 default:
2167 if (ndo->ndo_vflag <= 1) {
2168 print_unknown_data(ndo, tptr, "\n\t ", tlen);
2169 }
2170 }
2171 break;
2172 }
2173 case BGPTYPE_AIGP:
2174 {
2175 uint8_t type;
2176 uint16_t length;
2177
2178 ND_TCHECK2(tptr[0], 3);
2179
2180 tlen = len;
2181
2182 while (tlen >= 3) {
2183
2184 type = *tptr;
2185 length = EXTRACT_16BITS(tptr+1);
2186
2187 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u",
2188 tok2str(bgp_aigp_values, "Unknown", type),
2189 type, length));
2190
2191 /*
2192 * Check if we can read the TLV data.
2193 */
2194 ND_TCHECK2(tptr[3], length - 3);
2195
2196 switch (type) {
2197
2198 case BGP_AIGP_TLV:
2199 ND_TCHECK2(tptr[3], 8);
2200 ND_PRINT((ndo, ", metric %" PRIu64,
2201 EXTRACT_64BITS(tptr+3)));
2202 break;
2203
2204 default:
2205 if (ndo->ndo_vflag <= 1) {
2206 print_unknown_data(ndo, tptr+3,"\n\t ", length-3);
2207 }
2208 }
2209
2210 tptr += length;
2211 tlen -= length;
2212 }
2213 break;
2214 }
2215 case BGPTYPE_ATTR_SET:
2216 ND_TCHECK2(tptr[0], 4);
2217 if (len < 4)
2218 goto trunc;
2219 ND_PRINT((ndo, "\n\t Origin AS: %s",
2220 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr))));
2221 tptr+=4;
2222 len -=4;
2223
2224 while (len) {
2225 u_int aflags, alenlen, alen;
2226
2227 ND_TCHECK2(tptr[0], 2);
2228 if (len < 2)
2229 goto trunc;
2230 aflags = *tptr;
2231 atype = *(tptr + 1);
2232 tptr += 2;
2233 len -= 2;
2234 alenlen = bgp_attr_lenlen(aflags, tptr);
2235 ND_TCHECK2(tptr[0], alenlen);
2236 if (len < alenlen)
2237 goto trunc;
2238 alen = bgp_attr_len(aflags, tptr);
2239 tptr += alenlen;
2240 len -= alenlen;
2241
2242 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2243 tok2str(bgp_attr_values,
2244 "Unknown Attribute", atype),
2245 atype,
2246 alen));
2247
2248 if (aflags) {
2249 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2250 aflags & 0x80 ? "O" : "",
2251 aflags & 0x40 ? "T" : "",
2252 aflags & 0x20 ? "P" : "",
2253 aflags & 0x10 ? "E" : ""));
2254 if (aflags & 0xf)
2255 ND_PRINT((ndo, "+%x", aflags & 0xf));
2256 ND_PRINT((ndo, "]: "));
2257 }
2258 /* FIXME check for recursion */
2259 if (!bgp_attr_print(ndo, atype, tptr, alen))
2260 return 0;
2261 tptr += alen;
2262 len -= alen;
2263 }
2264 break;
2265
2266 case BGPTYPE_LARGE_COMMUNITY:
2267 if (len == 0 || len % 12) {
2268 ND_PRINT((ndo, "invalid len"));
2269 break;
2270 }
2271 ND_PRINT((ndo, "\n\t "));
2272 while (len > 0) {
2273 ND_TCHECK2(*tptr, 12);
2274 ND_PRINT((ndo, "%u:%u:%u%s",
2275 EXTRACT_32BITS(tptr),
2276 EXTRACT_32BITS(tptr + 4),
2277 EXTRACT_32BITS(tptr + 8),
2278 (len > 12) ? ", " : ""));
2279 tptr += 12;
2280 len -= 12;
2281 }
2282 break;
2283 default:
2284 ND_TCHECK2(*pptr,len);
2285 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2286 if (ndo->ndo_vflag <= 1)
2287 print_unknown_data(ndo, pptr, "\n\t ", len);
2288 break;
2289 }
2290 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2291 ND_TCHECK2(*pptr,len);
2292 print_unknown_data(ndo, pptr, "\n\t ", len);
2293 }
2294 return 1;
2295
2296 trunc:
2297 return 0;
2298 }
2299
2300 static void
bgp_capabilities_print(netdissect_options * ndo,const u_char * opt,int caps_len)2301 bgp_capabilities_print(netdissect_options *ndo,
2302 const u_char *opt, int caps_len)
2303 {
2304 int cap_type, cap_len, tcap_len, cap_offset;
2305 int i = 0;
2306
2307 while (i < caps_len) {
2308 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE);
2309 cap_type=opt[i];
2310 cap_len=opt[i+1];
2311 tcap_len=cap_len;
2312 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2313 tok2str(bgp_capcode_values, "Unknown",
2314 cap_type),
2315 cap_type,
2316 cap_len));
2317 ND_TCHECK2(opt[i+2], cap_len);
2318 switch (cap_type) {
2319 case BGP_CAPCODE_MP:
2320 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2321 tok2str(af_values, "Unknown",
2322 EXTRACT_16BITS(opt+i+2)),
2323 EXTRACT_16BITS(opt+i+2),
2324 tok2str(bgp_safi_values, "Unknown",
2325 opt[i+5]),
2326 opt[i+5]));
2327 break;
2328 case BGP_CAPCODE_RESTART:
2329 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2330 ((opt[i+2])&0x80) ? "R" : "none",
2331 EXTRACT_16BITS(opt+i+2)&0xfff));
2332 tcap_len-=2;
2333 cap_offset=4;
2334 while(tcap_len>=4) {
2335 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2336 tok2str(af_values,"Unknown",
2337 EXTRACT_16BITS(opt+i+cap_offset)),
2338 EXTRACT_16BITS(opt+i+cap_offset),
2339 tok2str(bgp_safi_values,"Unknown",
2340 opt[i+cap_offset+2]),
2341 opt[i+cap_offset+2],
2342 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" ));
2343 tcap_len-=4;
2344 cap_offset+=4;
2345 }
2346 break;
2347 case BGP_CAPCODE_RR:
2348 case BGP_CAPCODE_RR_CISCO:
2349 break;
2350 case BGP_CAPCODE_AS_NEW:
2351
2352 /*
2353 * Extract the 4 byte AS number encoded.
2354 */
2355 if (cap_len == 4) {
2356 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2357 as_printf(ndo, astostr, sizeof(astostr),
2358 EXTRACT_32BITS(opt + i + 2))));
2359 }
2360 break;
2361 case BGP_CAPCODE_ADD_PATH:
2362 cap_offset=2;
2363 if (tcap_len == 0) {
2364 ND_PRINT((ndo, " (bogus)")); /* length */
2365 break;
2366 }
2367 while (tcap_len > 0) {
2368 if (tcap_len < 4) {
2369 ND_PRINT((ndo, "\n\t\t(invalid)"));
2370 break;
2371 }
2372 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2373 tok2str(af_values,"Unknown",EXTRACT_16BITS(opt+i+cap_offset)),
2374 EXTRACT_16BITS(opt+i+cap_offset),
2375 tok2str(bgp_safi_values,"Unknown",opt[i+cap_offset+2]),
2376 opt[i+cap_offset+2],
2377 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",opt[i+cap_offset+3])
2378 ));
2379 tcap_len-=4;
2380 cap_offset+=4;
2381 }
2382 break;
2383 default:
2384 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2385 cap_type));
2386 if (ndo->ndo_vflag <= 1)
2387 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2388 break;
2389 }
2390 if (ndo->ndo_vflag > 1 && cap_len > 0) {
2391 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2392 }
2393 i += BGP_CAP_HEADER_SIZE + cap_len;
2394 }
2395 return;
2396
2397 trunc:
2398 ND_PRINT((ndo, "[|BGP]"));
2399 }
2400
2401 static void
bgp_open_print(netdissect_options * ndo,const u_char * dat,int length)2402 bgp_open_print(netdissect_options *ndo,
2403 const u_char *dat, int length)
2404 {
2405 struct bgp_open bgpo;
2406 struct bgp_opt bgpopt;
2407 const u_char *opt;
2408 int i;
2409
2410 ND_TCHECK2(dat[0], BGP_OPEN_SIZE);
2411 memcpy(&bgpo, dat, BGP_OPEN_SIZE);
2412
2413 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version));
2414 ND_PRINT((ndo, "my AS %s, ",
2415 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas))));
2416 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime)));
2417 ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgpo.bgpo_id)));
2418 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen));
2419
2420 /* some little sanity checking */
2421 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE)
2422 return;
2423
2424 /* ugly! */
2425 opt = &((const struct bgp_open *)dat)->bgpo_optlen;
2426 opt++;
2427
2428 i = 0;
2429 while (i < bgpo.bgpo_optlen) {
2430 ND_TCHECK2(opt[i], BGP_OPT_SIZE);
2431 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE);
2432 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
2433 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len));
2434 break;
2435 }
2436
2437 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u",
2438 tok2str(bgp_opt_values,"Unknown",
2439 bgpopt.bgpopt_type),
2440 bgpopt.bgpopt_type,
2441 bgpopt.bgpopt_len));
2442
2443 /* now let's decode the options we know*/
2444 switch(bgpopt.bgpopt_type) {
2445
2446 case BGP_OPT_CAP:
2447 bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE],
2448 bgpopt.bgpopt_len);
2449 break;
2450
2451 case BGP_OPT_AUTH:
2452 default:
2453 ND_PRINT((ndo, "\n\t no decoder for option %u",
2454 bgpopt.bgpopt_type));
2455 break;
2456 }
2457 i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
2458 }
2459 return;
2460 trunc:
2461 ND_PRINT((ndo, "[|BGP]"));
2462 }
2463
2464 static void
bgp_update_print(netdissect_options * ndo,const u_char * dat,int length)2465 bgp_update_print(netdissect_options *ndo,
2466 const u_char *dat, int length)
2467 {
2468 struct bgp bgp;
2469 const u_char *p;
2470 int withdrawn_routes_len;
2471 int len;
2472 int i;
2473
2474 ND_TCHECK2(dat[0], BGP_SIZE);
2475 if (length < BGP_SIZE)
2476 goto trunc;
2477 memcpy(&bgp, dat, BGP_SIZE);
2478 p = dat + BGP_SIZE; /*XXX*/
2479 length -= BGP_SIZE;
2480
2481 /* Unfeasible routes */
2482 ND_TCHECK2(p[0], 2);
2483 if (length < 2)
2484 goto trunc;
2485 withdrawn_routes_len = EXTRACT_16BITS(p);
2486 p += 2;
2487 length -= 2;
2488 if (withdrawn_routes_len) {
2489 /*
2490 * Without keeping state from the original NLRI message,
2491 * it's not possible to tell if this a v4 or v6 route,
2492 * so only try to decode it if we're not v6 enabled.
2493 */
2494 ND_TCHECK2(p[0], withdrawn_routes_len);
2495 if (length < withdrawn_routes_len)
2496 goto trunc;
2497 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len));
2498 p += withdrawn_routes_len;
2499 length -= withdrawn_routes_len;
2500 }
2501
2502 ND_TCHECK2(p[0], 2);
2503 if (length < 2)
2504 goto trunc;
2505 len = EXTRACT_16BITS(p);
2506 p += 2;
2507 length -= 2;
2508
2509 if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2510 /* No withdrawn routes, no path attributes, no NLRI */
2511 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)"));
2512 return;
2513 }
2514
2515 if (len) {
2516 /* do something more useful!*/
2517 while (len) {
2518 int aflags, atype, alenlen, alen;
2519
2520 ND_TCHECK2(p[0], 2);
2521 if (len < 2)
2522 goto trunc;
2523 if (length < 2)
2524 goto trunc;
2525 aflags = *p;
2526 atype = *(p + 1);
2527 p += 2;
2528 len -= 2;
2529 length -= 2;
2530 alenlen = bgp_attr_lenlen(aflags, p);
2531 ND_TCHECK2(p[0], alenlen);
2532 if (len < alenlen)
2533 goto trunc;
2534 if (length < alenlen)
2535 goto trunc;
2536 alen = bgp_attr_len(aflags, p);
2537 p += alenlen;
2538 len -= alenlen;
2539 length -= alenlen;
2540
2541 ND_PRINT((ndo, "\n\t %s (%u), length: %u",
2542 tok2str(bgp_attr_values, "Unknown Attribute",
2543 atype),
2544 atype,
2545 alen));
2546
2547 if (aflags) {
2548 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2549 aflags & 0x80 ? "O" : "",
2550 aflags & 0x40 ? "T" : "",
2551 aflags & 0x20 ? "P" : "",
2552 aflags & 0x10 ? "E" : ""));
2553 if (aflags & 0xf)
2554 ND_PRINT((ndo, "+%x", aflags & 0xf));
2555 ND_PRINT((ndo, "]: "));
2556 }
2557 if (len < alen)
2558 goto trunc;
2559 if (length < alen)
2560 goto trunc;
2561 if (!bgp_attr_print(ndo, atype, p, alen))
2562 goto trunc;
2563 p += alen;
2564 len -= alen;
2565 length -= alen;
2566 }
2567 }
2568
2569 if (length) {
2570 /*
2571 * XXX - what if they're using the "Advertisement of
2572 * Multiple Paths in BGP" feature:
2573 *
2574 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/
2575 *
2576 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06
2577 */
2578 ND_PRINT((ndo, "\n\t Updated routes:"));
2579 while (length) {
2580 char buf[MAXHOSTNAMELEN + 100];
2581 i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2582 if (i == -1) {
2583 ND_PRINT((ndo, "\n\t (illegal prefix length)"));
2584 break;
2585 } else if (i == -2)
2586 goto trunc;
2587 else if (i == -3)
2588 goto trunc; /* bytes left, but not enough */
2589 else {
2590 ND_PRINT((ndo, "\n\t %s", buf));
2591 p += i;
2592 length -= i;
2593 }
2594 }
2595 }
2596 return;
2597 trunc:
2598 ND_PRINT((ndo, "[|BGP]"));
2599 }
2600
2601 static void
bgp_notification_print(netdissect_options * ndo,const u_char * dat,int length)2602 bgp_notification_print(netdissect_options *ndo,
2603 const u_char *dat, int length)
2604 {
2605 struct bgp_notification bgpn;
2606 const u_char *tptr;
2607
2608 ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
2609 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
2610
2611 /* some little sanity checking */
2612 if (length<BGP_NOTIFICATION_SIZE)
2613 return;
2614
2615 ND_PRINT((ndo, ", %s (%u)",
2616 tok2str(bgp_notify_major_values, "Unknown Error",
2617 bgpn.bgpn_major),
2618 bgpn.bgpn_major));
2619
2620 switch (bgpn.bgpn_major) {
2621
2622 case BGP_NOTIFY_MAJOR_MSG:
2623 ND_PRINT((ndo, ", subcode %s (%u)",
2624 tok2str(bgp_notify_minor_msg_values, "Unknown",
2625 bgpn.bgpn_minor),
2626 bgpn.bgpn_minor));
2627 break;
2628 case BGP_NOTIFY_MAJOR_OPEN:
2629 ND_PRINT((ndo, ", subcode %s (%u)",
2630 tok2str(bgp_notify_minor_open_values, "Unknown",
2631 bgpn.bgpn_minor),
2632 bgpn.bgpn_minor));
2633 break;
2634 case BGP_NOTIFY_MAJOR_UPDATE:
2635 ND_PRINT((ndo, ", subcode %s (%u)",
2636 tok2str(bgp_notify_minor_update_values, "Unknown",
2637 bgpn.bgpn_minor),
2638 bgpn.bgpn_minor));
2639 break;
2640 case BGP_NOTIFY_MAJOR_FSM:
2641 ND_PRINT((ndo, " subcode %s (%u)",
2642 tok2str(bgp_notify_minor_fsm_values, "Unknown",
2643 bgpn.bgpn_minor),
2644 bgpn.bgpn_minor));
2645 break;
2646 case BGP_NOTIFY_MAJOR_CAP:
2647 ND_PRINT((ndo, " subcode %s (%u)",
2648 tok2str(bgp_notify_minor_cap_values, "Unknown",
2649 bgpn.bgpn_minor),
2650 bgpn.bgpn_minor));
2651 break;
2652 case BGP_NOTIFY_MAJOR_CEASE:
2653 ND_PRINT((ndo, ", subcode %s (%u)",
2654 tok2str(bgp_notify_minor_cease_values, "Unknown",
2655 bgpn.bgpn_minor),
2656 bgpn.bgpn_minor));
2657
2658 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2659 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2660 */
2661 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2662 tptr = dat + BGP_NOTIFICATION_SIZE;
2663 ND_TCHECK2(*tptr, 7);
2664 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2665 tok2str(af_values, "Unknown",
2666 EXTRACT_16BITS(tptr)),
2667 EXTRACT_16BITS(tptr),
2668 tok2str(bgp_safi_values, "Unknown", *(tptr+2)),
2669 *(tptr+2),
2670 EXTRACT_32BITS(tptr+3)));
2671 }
2672 break;
2673 default:
2674 break;
2675 }
2676
2677 return;
2678 trunc:
2679 ND_PRINT((ndo, "[|BGP]"));
2680 }
2681
2682 static void
bgp_route_refresh_print(netdissect_options * ndo,const u_char * pptr,int len)2683 bgp_route_refresh_print(netdissect_options *ndo,
2684 const u_char *pptr, int len)
2685 {
2686 const struct bgp_route_refresh *bgp_route_refresh_header;
2687
2688 ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE);
2689
2690 /* some little sanity checking */
2691 if (len<BGP_ROUTE_REFRESH_SIZE)
2692 return;
2693
2694 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2695
2696 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)",
2697 tok2str(af_values,"Unknown",
2698 /* this stinks but the compiler pads the structure
2699 * weird */
2700 EXTRACT_16BITS(&bgp_route_refresh_header->afi)),
2701 EXTRACT_16BITS(&bgp_route_refresh_header->afi),
2702 tok2str(bgp_safi_values,"Unknown",
2703 bgp_route_refresh_header->safi),
2704 bgp_route_refresh_header->safi));
2705
2706 if (ndo->ndo_vflag > 1) {
2707 ND_TCHECK2(*pptr, len);
2708 print_unknown_data(ndo, pptr, "\n\t ", len);
2709 }
2710
2711 return;
2712 trunc:
2713 ND_PRINT((ndo, "[|BGP]"));
2714 }
2715
2716 static int
bgp_header_print(netdissect_options * ndo,const u_char * dat,int length)2717 bgp_header_print(netdissect_options *ndo,
2718 const u_char *dat, int length)
2719 {
2720 struct bgp bgp;
2721
2722 ND_TCHECK2(dat[0], BGP_SIZE);
2723 memcpy(&bgp, dat, BGP_SIZE);
2724 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2725 tok2str(bgp_msg_values, "Unknown", bgp.bgp_type),
2726 bgp.bgp_type,
2727 length));
2728
2729 switch (bgp.bgp_type) {
2730 case BGP_OPEN:
2731 bgp_open_print(ndo, dat, length);
2732 break;
2733 case BGP_UPDATE:
2734 bgp_update_print(ndo, dat, length);
2735 break;
2736 case BGP_NOTIFICATION:
2737 bgp_notification_print(ndo, dat, length);
2738 break;
2739 case BGP_KEEPALIVE:
2740 break;
2741 case BGP_ROUTE_REFRESH:
2742 bgp_route_refresh_print(ndo, dat, length);
2743 break;
2744 default:
2745 /* we have no decoder for the BGP message */
2746 ND_TCHECK2(*dat, length);
2747 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type));
2748 print_unknown_data(ndo, dat, "\n\t ", length);
2749 break;
2750 }
2751 return 1;
2752 trunc:
2753 ND_PRINT((ndo, "[|BGP]"));
2754 return 0;
2755 }
2756
2757 void
bgp_print(netdissect_options * ndo,const u_char * dat,int length)2758 bgp_print(netdissect_options *ndo,
2759 const u_char *dat, int length)
2760 {
2761 const u_char *p;
2762 const u_char *ep;
2763 const u_char *start;
2764 const u_char marker[] = {
2765 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2766 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2767 };
2768 struct bgp bgp;
2769 uint16_t hlen;
2770
2771 ep = dat + length;
2772 if (ndo->ndo_snapend < dat + length)
2773 ep = ndo->ndo_snapend;
2774
2775 ND_PRINT((ndo, ": BGP"));
2776
2777 if (ndo->ndo_vflag < 1) /* lets be less chatty */
2778 return;
2779
2780 p = dat;
2781 start = p;
2782 while (p < ep) {
2783 if (!ND_TTEST2(p[0], 1))
2784 break;
2785 if (p[0] != 0xff) {
2786 p++;
2787 continue;
2788 }
2789
2790 if (!ND_TTEST2(p[0], sizeof(marker)))
2791 break;
2792 if (memcmp(p, marker, sizeof(marker)) != 0) {
2793 p++;
2794 continue;
2795 }
2796
2797 /* found BGP header */
2798 ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/
2799 memcpy(&bgp, p, BGP_SIZE);
2800
2801 if (start != p)
2802 ND_PRINT((ndo, " [|BGP]"));
2803
2804 hlen = ntohs(bgp.bgp_len);
2805 if (hlen < BGP_SIZE) {
2806 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
2807 BGP_SIZE));
2808 break;
2809 }
2810
2811 if (ND_TTEST2(p[0], hlen)) {
2812 if (!bgp_header_print(ndo, p, hlen))
2813 return;
2814 p += hlen;
2815 start = p;
2816 } else {
2817 ND_PRINT((ndo, "\n[|BGP %s]",
2818 tok2str(bgp_msg_values,
2819 "Unknown Message Type",
2820 bgp.bgp_type)));
2821 break;
2822 }
2823 }
2824
2825 return;
2826
2827 trunc:
2828 ND_PRINT((ndo, " [|BGP]"));
2829 }
2830
2831 /*
2832 * Local Variables:
2833 * c-style: whitesmith
2834 * c-basic-offset: 4
2835 * End:
2836 */
2837