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add recent IANA SAFI and CAP codepoints - FIXME: add decoder
[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@juniper.net) for more
30 * complete BGP support.
31 */
32
33 #ifdef HAVE_CONFIG_H
34 #include "config.h"
35 #endif
36
37 #ifndef lint
38 static const char rcsid[] _U_ =
39 "@(#) $Header: /tcpdump/master/tcpdump/print-bgp.c,v 1.80 2004-03-18 11:14:45 hannes Exp $";
40 #endif
41
42 #include <tcpdump-stdinc.h>
43
44 #include <stdio.h>
45 #include <string.h>
46
47 #include "interface.h"
48 #include "addrtoname.h"
49 #include "extract.h"
50
51 struct bgp {
52 u_int8_t bgp_marker[16];
53 u_int16_t bgp_len;
54 u_int8_t bgp_type;
55 };
56 #define BGP_SIZE 19 /* unaligned */
57
58 #define BGP_OPEN 1
59 #define BGP_UPDATE 2
60 #define BGP_NOTIFICATION 3
61 #define BGP_KEEPALIVE 4
62 #define BGP_ROUTE_REFRESH 5
63
64 static struct tok bgp_msg_values[] = {
65 { BGP_OPEN, "Open"},
66 { BGP_UPDATE, "Update"},
67 { BGP_NOTIFICATION, "Notification"},
68 { BGP_KEEPALIVE, "Keepalive"},
69 { BGP_ROUTE_REFRESH, "Route Refresh"},
70 { 0, NULL}
71 };
72
73 struct bgp_open {
74 u_int8_t bgpo_marker[16];
75 u_int16_t bgpo_len;
76 u_int8_t bgpo_type;
77 u_int8_t bgpo_version;
78 u_int16_t bgpo_myas;
79 u_int16_t bgpo_holdtime;
80 u_int32_t bgpo_id;
81 u_int8_t bgpo_optlen;
82 /* options should follow */
83 };
84 #define BGP_OPEN_SIZE 29 /* unaligned */
85
86 struct bgp_opt {
87 u_int8_t bgpopt_type;
88 u_int8_t bgpopt_len;
89 /* variable length */
90 };
91 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
92
93 struct bgp_notification {
94 u_int8_t bgpn_marker[16];
95 u_int16_t bgpn_len;
96 u_int8_t bgpn_type;
97 u_int8_t bgpn_major;
98 u_int8_t bgpn_minor;
99 };
100 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */
101
102 struct bgp_route_refresh {
103 u_int8_t bgp_marker[16];
104 u_int16_t len;
105 u_int8_t type;
106 u_int8_t afi[2]; /* the compiler messes this structure up */
107 u_int8_t res; /* when doing misaligned sequences of int8 and int16 */
108 u_int8_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 struct bgp_attr {
113 u_int8_t bgpa_flags;
114 u_int8_t bgpa_type;
115 union {
116 u_int8_t len;
117 u_int16_t elen;
118 } bgpa_len;
119 #define bgp_attr_len(p) \
120 (((p)->bgpa_flags & 0x10) ? \
121 EXTRACT_16BITS(&(p)->bgpa_len.elen) : (p)->bgpa_len.len)
122 #define bgp_attr_off(p) \
123 (((p)->bgpa_flags & 0x10) ? 4 : 3)
124 };
125
126 #define BGPTYPE_ORIGIN 1
127 #define BGPTYPE_AS_PATH 2
128 #define BGPTYPE_NEXT_HOP 3
129 #define BGPTYPE_MULTI_EXIT_DISC 4
130 #define BGPTYPE_LOCAL_PREF 5
131 #define BGPTYPE_ATOMIC_AGGREGATE 6
132 #define BGPTYPE_AGGREGATOR 7
133 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
134 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC1998 */
135 #define BGPTYPE_CLUSTER_LIST 10 /* RFC1998 */
136 #define BGPTYPE_DPA 11 /* draft-ietf-idr-bgp-dpa */
137 #define BGPTYPE_ADVERTISERS 12 /* RFC1863 */
138 #define BGPTYPE_RCID_PATH 13 /* RFC1863 */
139 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC2283 */
140 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC2283 */
141 #define BGPTYPE_EXTD_COMMUNITIES 16 /* draft-ietf-idr-bgp-ext-communities */
142 #define BGPTYPE_ATTR_SET 128 /* draft-marques-ppvpn-ibgp */
143
144 static struct tok bgp_attr_values[] = {
145 { BGPTYPE_ORIGIN, "Origin"},
146 { BGPTYPE_AS_PATH, "AS Path"},
147 { BGPTYPE_NEXT_HOP, "Next Hop"},
148 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
149 { BGPTYPE_LOCAL_PREF, "Local Preference"},
150 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
151 { BGPTYPE_AGGREGATOR, "Aggregator"},
152 { BGPTYPE_COMMUNITIES, "Community"},
153 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
154 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
155 { BGPTYPE_DPA, "DPA"},
156 { BGPTYPE_ADVERTISERS, "Advertisers"},
157 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"},
158 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
159 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
160 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
161 { BGPTYPE_ATTR_SET, "Attribute Set"},
162 { 255, "Reserved for development"},
163 { 0, NULL}
164 };
165
166 #define BGP_AS_SET 1
167 #define BGP_AS_SEQUENCE 2
168 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
169 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
170
171 static struct tok bgp_as_path_segment_open_values[] = {
172 { BGP_AS_SEQUENCE, ""},
173 { BGP_AS_SET, "{ "},
174 { BGP_CONFED_AS_SEQUENCE, "( "},
175 { BGP_CONFED_AS_SET, "({ "},
176 { 0, NULL}
177 };
178
179 static struct tok bgp_as_path_segment_close_values[] = {
180 { BGP_AS_SEQUENCE, ""},
181 { BGP_AS_SET, "}"},
182 { BGP_CONFED_AS_SEQUENCE, ")"},
183 { BGP_CONFED_AS_SET, "})"},
184 { 0, NULL}
185 };
186
187 #define BGP_OPT_AUTH 1
188 #define BGP_OPT_CAP 2
189
190
191 static struct tok bgp_opt_values[] = {
192 { BGP_OPT_AUTH, "Authentication Information"},
193 { BGP_OPT_CAP, "Capabilities Advertisement"},
194 { 0, NULL}
195 };
196
197 #define BGP_CAPCODE_MP 1
198 #define BGP_CAPCODE_RR 2
199 #define BGP_CAPCODE_ORF 3 /* XXX */
200 #define BGP_CAPCODE_RESTART 64 /* draft-ietf-idr-restart-05 */
201 #define BGP_CAPCODE_AS_NEW 65 /* XXX */
202 #define BGP_CAPCODE_DYN_CAP 67 /* XXX */
203 #define BGP_CAPCODE_RR_CISCO 128
204
205 static struct tok bgp_capcode_values[] = {
206 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
207 { BGP_CAPCODE_RR, "Route Refresh"},
208 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
209 { BGP_CAPCODE_RESTART, "Graceful Restart"},
210 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
211 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
212 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
213 { 0, NULL}
214 };
215
216 #define BGP_NOTIFY_MAJOR_MSG 1
217 #define BGP_NOTIFY_MAJOR_OPEN 2
218 #define BGP_NOTIFY_MAJOR_UPDATE 3
219 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
220 #define BGP_NOTIFY_MAJOR_FSM 5
221 #define BGP_NOTIFY_MAJOR_CEASE 6
222 #define BGP_NOTIFY_MAJOR_CAP 7
223
224 static struct tok bgp_notify_major_values[] = {
225 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
226 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
227 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
228 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
229 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
230 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
231 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"},
232 { 0, NULL}
233 };
234
235 /* draft-ietf-idr-cease-subcode-02 */
236 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
237 static struct tok bgp_notify_minor_cease_values[] = {
238 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
239 { 2, "Administratively Shutdown"},
240 { 3, "Peer Unconfigured"},
241 { 4, "Administratively Reset"},
242 { 5, "Connection Rejected"},
243 { 6, "Other Configuration Change"},
244 { 7, "Connection Collision Resolution"},
245 { 0, NULL}
246 };
247
248 static struct tok bgp_notify_minor_msg_values[] = {
249 { 1, "Connection Not Synchronized"},
250 { 2, "Bad Message Length"},
251 { 3, "Bad Message Type"},
252 { 0, NULL}
253 };
254
255 static struct tok bgp_notify_minor_open_values[] = {
256 { 1, "Unsupported Version Number"},
257 { 2, "Bad Peer AS"},
258 { 3, "Bad BGP Identifier"},
259 { 4, "Unsupported Optional Parameter"},
260 { 5, "Authentication Failure"},
261 { 6, "Unacceptable Hold Time"},
262 { 0, NULL}
263 };
264
265 static struct tok bgp_notify_minor_update_values[] = {
266 { 1, "Malformed Attribute List"},
267 { 2, "Unrecognized Well-known Attribute"},
268 { 3, "Missing Well-known Attribute"},
269 { 4, "Attribute Flags Error"},
270 { 5, "Attribute Length Error"},
271 { 6, "Invalid ORIGIN Attribute"},
272 { 7, "AS Routing Loop"},
273 { 8, "Invalid NEXT_HOP Attribute"},
274 { 9, "Optional Attribute Error"},
275 { 10, "Invalid Network Field"},
276 { 11, "Malformed AS_PATH"},
277 { 0, NULL}
278 };
279
280 static struct tok bgp_notify_minor_cap_values[] = {
281 { 1, "Invalid Action Value" },
282 { 2, "Invalid Capability Length" },
283 { 3, "Malformed Capability Value" },
284 { 4, "Unsupported Capability Code" },
285 { 0, NULL }
286 };
287
288 static struct tok bgp_origin_values[] = {
289 { 0, "IGP"},
290 { 1, "EGP"},
291 { 2, "Incomplete"},
292 { 0, NULL}
293 };
294
295 /* Subsequent address family identifier, RFC2283 section 7 */
296 #define SAFNUM_RES 0
297 #define SAFNUM_UNICAST 1
298 #define SAFNUM_MULTICAST 2
299 #define SAFNUM_UNIMULTICAST 3
300 /* labeled BGP RFC3107 */
301 #define SAFNUM_LABUNICAST 4
302 #define SAFNUM_TUNNEL 64 /* XXX */
303 #define SAFNUM_VPLS 65 /* XXX */
304 #define SAFNUM_MDT 66 /* XXX */
305 /* Section 4.3.4 of draft-rosen-rfc2547bis-03.txt */
306 #define SAFNUM_VPNUNICAST 128
307 #define SAFNUM_VPNMULTICAST 129
308 #define SAFNUM_VPNUNIMULTICAST 130
309 /* draft-marques-ppvpn-rt-constrain-01.txt */
310 #define SAFNUM_RT_ROUTING_INFO 132
311
312 #define BGP_VPN_RD_LEN 8
313
314 static struct tok bgp_safi_values[] = {
315 { SAFNUM_RES, "Reserved"},
316 { SAFNUM_UNICAST, "Unicast"},
317 { SAFNUM_MULTICAST, "Multicast"},
318 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
319 { SAFNUM_LABUNICAST, "labeled Unicast"},
320 { SAFNUM_TUNNEL, "Tunnel"},
321 { SAFNUM_VPLS, "VPLS"},
322 { SAFNUM_MDT, "MDT"},
323 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
324 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
325 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
326 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"}, /* draft-marques-ppvpn-rt-constrain-01.txt */
327 { 0, NULL }
328 };
329
330 /* well-known community */
331 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
332 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
333 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
334
335 /* RFC1700 address family numbers */
336 #define AFNUM_INET 1
337 #define AFNUM_INET6 2
338 #define AFNUM_NSAP 3
339 #define AFNUM_HDLC 4
340 #define AFNUM_BBN1822 5
341 #define AFNUM_802 6
342 #define AFNUM_E163 7
343 #define AFNUM_E164 8
344 #define AFNUM_F69 9
345 #define AFNUM_X121 10
346 #define AFNUM_IPX 11
347 #define AFNUM_ATALK 12
348 #define AFNUM_DECNET 13
349 #define AFNUM_BANYAN 14
350 #define AFNUM_E164NSAP 15
351 /* draft-kompella-ppvpn-l2vpn */
352 #define AFNUM_L2VPN 196 /* still to be approved by IANA */
353
354 static struct tok bgp_afi_values[] = {
355 { 0, "Reserved"},
356 { AFNUM_INET, "IPv4"},
357 { AFNUM_INET6, "IPv6"},
358 { AFNUM_NSAP, "NSAP"},
359 { AFNUM_HDLC, "HDLC"},
360 { AFNUM_BBN1822, "BBN 1822"},
361 { AFNUM_802, "802"},
362 { AFNUM_E163, "E.163"},
363 { AFNUM_E164, "E.164"},
364 { AFNUM_F69, "F.69"},
365 { AFNUM_X121, "X.121"},
366 { AFNUM_IPX, "Novell IPX"},
367 { AFNUM_ATALK, "Appletalk"},
368 { AFNUM_DECNET, "Decnet IV"},
369 { AFNUM_BANYAN, "Banyan Vines"},
370 { AFNUM_E164NSAP, "E.164 with NSAP subaddress"},
371 { AFNUM_L2VPN, "Layer-2 VPN"},
372 { 0, NULL},
373 };
374
375 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */
376 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
377 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
378 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
379 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
380 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
381 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
382 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
383 /* rfc2547 bgp-mpls-vpns */
384 #define BGP_EXT_COM_CISCO_MCAST 0x0009 /* cisco proprietary */
385
386 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
387 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatability */
388 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatability */
389 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatability */
390
391 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
392 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatability */
393
394 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
395 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatability */
396
397 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
398
399 static struct tok bgp_extd_comm_flag_values[] = {
400 { 0x8000, "vendor-specific"},
401 { 0x4000, "non-transitive"},
402 { 0, NULL},
403 };
404
405 static struct tok bgp_extd_comm_subtype_values[] = {
406 { BGP_EXT_COM_RT_0, "target"},
407 { BGP_EXT_COM_RT_1, "target"},
408 { BGP_EXT_COM_RT_2, "target"},
409 { BGP_EXT_COM_RO_0, "origin"},
410 { BGP_EXT_COM_RO_1, "origin"},
411 { BGP_EXT_COM_RO_2, "origin"},
412 { BGP_EXT_COM_LINKBAND, "link-BW"},
413 { BGP_EXT_COM_CISCO_MCAST, "mdt-group"},
414 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
415 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
416 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
417 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
418 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
419 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
420 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
421 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
422 { BGP_EXT_COM_L2INFO, "layer2-info"},
423 { 0, NULL},
424 };
425
426 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
427 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
428 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
429 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
430 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
431 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
432 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
433 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
434
435 static struct tok bgp_extd_comm_ospf_rtype_values[] = {
436 { BGP_OSPF_RTYPE_RTR, "Router" },
437 { BGP_OSPF_RTYPE_NET, "Network" },
438 { BGP_OSPF_RTYPE_SUM, "Summary" },
439 { BGP_OSPF_RTYPE_EXT, "External" },
440 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
441 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
442 { 0, NULL },
443 };
444
445 static struct tok bgp_l2vpn_encaps_values[] = {
446 { 0, "Reserved"},
447 { 1, "Frame Relay"},
448 { 2, "ATM AAL5 VCC transport"},
449 { 3, "ATM transparent cell transport"},
450 { 4, "Ethernet VLAN"},
451 { 5, "Ethernet"},
452 { 6, "Cisco-HDLC"},
453 { 7, "PPP"},
454 { 8, "CEM"},
455 { 9, "ATM VCC cell transport"},
456 { 10, "ATM VPC cell transport"},
457 { 11, "MPLS"},
458 { 12, "VPLS"},
459 { 64, "IP-interworking"},
460 { 0, NULL},
461 };
462
463 static int
464 decode_prefix4(const u_char *pptr, char *buf, u_int buflen)
465 {
466 struct in_addr addr;
467 u_int plen;
468
469 plen = pptr[0];
470 if (32 < plen)
471 return -1;
472
473 memset(&addr, 0, sizeof(addr));
474 memcpy(&addr, &pptr[1], (plen + 7) / 8);
475 if (plen % 8) {
476 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
477 ((0xff00 >> (plen % 8)) & 0xff);
478 }
479 snprintf(buf, buflen, "%s/%d", getname((u_char *)&addr), plen);
480 return 1 + (plen + 7) / 8;
481 }
482
483 static int
484 decode_labeled_prefix4(const u_char *pptr, char *buf, u_int buflen)
485 {
486 struct in_addr addr;
487 u_int plen;
488
489 plen = pptr[0]; /* get prefix length */
490
491 /* this is one of the weirdnesses of rfc3107
492 the label length (actually the label + COS bits)
493 is added to the prefix length;
494 we also do only read out just one label -
495 there is no real application for advertisement of
496 stacked labels in a a single BGP message
497 */
498
499 plen-=24; /* adjust prefixlen - labellength */
500
501 if (32 < plen)
502 return -1;
503
504 memset(&addr, 0, sizeof(addr));
505 memcpy(&addr, &pptr[4], (plen + 7) / 8);
506 if (plen % 8) {
507 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
508 ((0xff00 >> (plen % 8)) & 0xff);
509 }
510 /* the label may get offsetted by 4 bits so lets shift it right */
511 snprintf(buf, buflen, "%s/%d, label:%u %s",
512 getname((u_char *)&addr),
513 plen,
514 EXTRACT_24BITS(pptr+1)>>4,
515 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
516
517 return 4 + (plen + 7) / 8;
518 }
519
520 /* RDs and RTs share the same semantics
521 * we use bgp_vpn_rd_print for
522 * printing route targets inside a NLRI */
523 static char *
524 bgp_vpn_rd_print (const u_char *pptr) {
525
526 /* allocate space for the largest possible string */
527 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
528 char *pos = rd;
529
530 /* ok lets load the RD format */
531 switch (EXTRACT_16BITS(pptr)) {
532
533 /* AS:IP-address fmt*/
534 case 0:
535 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u.%u.%u.%u",
536 EXTRACT_16BITS(pptr+2), *(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7));
537 break;
538 /* IP-address:AS fmt*/
539
540 case 1:
541 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
542 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6));
543 break;
544
545 /* 4-byte-AS:number fmt*/
546 case 2:
547 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (%u.%u.%u.%u:%u)",
548 EXTRACT_32BITS(pptr+2), EXTRACT_16BITS(pptr+6),
549 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6));
550 break;
551 default:
552 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
553 break;
554 }
555 pos += strlen(pos);
556 *(pos) = '\0';
557 return (rd);
558 }
559
560 static int
561 decode_rt_routing_info(const u_char *pptr, char *buf, u_int buflen)
562 {
563 u_int8_t route_target[8];
564 u_int plen;
565
566 plen = pptr[0]; /* get prefix length */
567
568 plen-=32; /* adjust prefix length */
569
570 if (0 < plen)
571 return -1;
572
573 memset(&route_target, 0, sizeof(route_target));
574 memcpy(&route_target, &pptr[1], (plen + 7) / 8);
575 if (plen % 8) {
576 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
577 ((0xff00 >> (plen % 8)) & 0xff);
578 }
579 snprintf(buf, buflen, "origin AS: %u, route target %s",
580 EXTRACT_32BITS(pptr+1),
581 bgp_vpn_rd_print((u_char *)&route_target));
582
583 return 5 + (plen + 7) / 8;
584 }
585
586 static int
587 decode_labeled_vpn_prefix4(const u_char *pptr, char *buf, u_int buflen)
588 {
589 struct in_addr addr;
590 u_int plen;
591
592 plen = pptr[0]; /* get prefix length */
593
594 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
595
596 if (32 < plen)
597 return -1;
598
599 memset(&addr, 0, sizeof(addr));
600 memcpy(&addr, &pptr[12], (plen + 7) / 8);
601 if (plen % 8) {
602 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
603 ((0xff00 >> (plen % 8)) & 0xff);
604 }
605 /* the label may get offsetted by 4 bits so lets shift it right */
606 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
607 bgp_vpn_rd_print(pptr+4),
608 getname((u_char *)&addr),
609 plen,
610 EXTRACT_24BITS(pptr+1)>>4,
611 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
612
613 return 12 + (plen + 7) / 8;
614 }
615
616 static int
617 decode_labeled_vpn_l2(const u_char *pptr, char *buf, u_int buflen)
618 {
619 int plen,tlen,strlen,tlv_type,tlv_len,ttlv_len;
620 plen=EXTRACT_16BITS(pptr);
621 tlen=plen;
622 pptr+=2;
623 strlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
624 bgp_vpn_rd_print(pptr),
625 EXTRACT_16BITS(pptr+8),
626 EXTRACT_16BITS(pptr+10),
627 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
628 pptr+=15;
629 tlen-=15;
630
631 /* ok now the variable part - lets read out TLVs*/
632 while (tlen>0) {
633 tlv_type=*pptr++;
634 tlv_len=EXTRACT_16BITS(pptr);
635 ttlv_len=tlv_len;
636 pptr+=2;
637
638 switch(tlv_type) {
639 case 1:
640 strlen+=snprintf(buf+strlen,buflen-strlen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
641 tlv_type,
642 tlv_len);
643 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
644 while (ttlv_len>0) {
645 strlen+=snprintf(buf+strlen,buflen-strlen, "%02x",*pptr++);
646 ttlv_len--;
647 }
648 break;
649 default:
650 snprintf(buf+strlen,buflen-strlen, "\n\t\tunknown TLV #%u, length: %u",
651 tlv_type,
652 tlv_len);
653 break;
654 }
655 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it tright */
656 }
657 return plen+2;
658 }
659
660 #ifdef INET6
661 static int
662 decode_prefix6(const u_char *pd, char *buf, u_int buflen)
663 {
664 struct in6_addr addr;
665 u_int plen;
666
667 plen = pd[0];
668 if (128 < plen)
669 return -1;
670
671 memset(&addr, 0, sizeof(addr));
672 memcpy(&addr, &pd[1], (plen + 7) / 8);
673 if (plen % 8) {
674 addr.s6_addr[(plen + 7) / 8 - 1] &=
675 ((0xff00 >> (plen % 8)) & 0xff);
676 }
677 snprintf(buf, buflen, "%s/%d", getname6((u_char *)&addr), plen);
678 return 1 + (plen + 7) / 8;
679 }
680
681 static int
682 decode_labeled_prefix6(const u_char *pptr, char *buf, u_int buflen)
683 {
684 struct in6_addr addr;
685 u_int plen;
686
687 plen = pptr[0]; /* get prefix length */
688 plen-=24; /* adjust prefixlen - labellength */
689
690 if (128 < plen)
691 return -1;
692
693 memset(&addr, 0, sizeof(addr));
694 memcpy(&addr, &pptr[4], (plen + 7) / 8);
695 if (plen % 8) {
696 addr.s6_addr[(plen + 7) / 8 - 1] &=
697 ((0xff00 >> (plen % 8)) & 0xff);
698 }
699 /* the label may get offsetted by 4 bits so lets shift it right */
700 snprintf(buf, buflen, "%s/%d, label:%u %s",
701 getname6((u_char *)&addr),
702 plen,
703 EXTRACT_24BITS(pptr+1)>>4,
704 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
705
706 return 4 + (plen + 7) / 8;
707 }
708
709 static int
710 decode_labeled_vpn_prefix6(const u_char *pptr, char *buf, u_int buflen)
711 {
712 struct in6_addr addr;
713 u_int plen;
714
715 plen = pptr[0]; /* get prefix length */
716
717 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
718
719 if (128 < plen)
720 return -1;
721
722 memset(&addr, 0, sizeof(addr));
723 memcpy(&addr, &pptr[12], (plen + 7) / 8);
724 if (plen % 8) {
725 addr.s6_addr[(plen + 7) / 8 - 1] &=
726 ((0xff00 >> (plen % 8)) & 0xff);
727 }
728 /* the label may get offsetted by 4 bits so lets shift it right */
729 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
730 bgp_vpn_rd_print(pptr+4),
731 getname6((u_char *)&addr),
732 plen,
733 EXTRACT_24BITS(pptr+1)>>4,
734 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
735
736 return 12 + (plen + 7) / 8;
737 }
738 #endif
739
740 static void
741 bgp_attr_print(const struct bgp_attr *attr, const u_char *pptr, int len)
742 {
743 int i;
744 u_int16_t af;
745 u_int8_t safi, snpa;
746 union { /* copy buffer for bandwidth values */
747 float f;
748 u_int32_t i;
749 } bw;
750 int advance;
751 int tlen;
752 const u_char *tptr;
753 char buf[MAXHOSTNAMELEN + 100];
754
755 tptr = pptr;
756 tlen=len;
757
758 switch (attr->bgpa_type) {
759 case BGPTYPE_ORIGIN:
760 if (len != 1)
761 printf("invalid len");
762 else
763 printf("%s", tok2str(bgp_origin_values, "Unknown Origin Typecode", tptr[0]));
764 break;
765 case BGPTYPE_AS_PATH:
766 if (len % 2) {
767 printf("invalid len");
768 break;
769 }
770 if (!len) {
771 printf("empty");
772 break;
773 }
774
775 while (tptr < pptr + len) {
776 printf("%s", tok2str(bgp_as_path_segment_open_values, "?", tptr[0]));
777 for (i = 0; i < tptr[1] * 2; i += 2) {
778 printf("%u ", EXTRACT_16BITS(&tptr[2 + i]));
779 }
780 printf("%s", tok2str(bgp_as_path_segment_close_values, "?", tptr[0]));
781 tptr += 2 + tptr[1] * 2;
782 }
783 break;
784 case BGPTYPE_NEXT_HOP:
785 if (len != 4)
786 printf("invalid len");
787 else
788 printf("%s", getname(tptr));
789 break;
790 case BGPTYPE_MULTI_EXIT_DISC:
791 case BGPTYPE_LOCAL_PREF:
792 if (len != 4)
793 printf("invalid len");
794 else
795 printf("%u", EXTRACT_32BITS(tptr));
796 break;
797 case BGPTYPE_ATOMIC_AGGREGATE:
798 if (len != 0)
799 printf("invalid len");
800 break;
801 case BGPTYPE_AGGREGATOR:
802 if (len != 6) {
803 printf("invalid len");
804 break;
805 }
806 printf(" AS #%u, origin %s", EXTRACT_16BITS(tptr),
807 getname(tptr + 2));
808 break;
809 case BGPTYPE_COMMUNITIES:
810 if (len % 4) {
811 printf("invalid len");
812 break;
813 }
814 while (tlen>0) {
815 u_int32_t comm;
816 comm = EXTRACT_32BITS(tptr);
817 switch (comm) {
818 case BGP_COMMUNITY_NO_EXPORT:
819 printf(" NO_EXPORT");
820 break;
821 case BGP_COMMUNITY_NO_ADVERT:
822 printf(" NO_ADVERTISE");
823 break;
824 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
825 printf(" NO_EXPORT_SUBCONFED");
826 break;
827 default:
828 printf("%u:%u%s",
829 (comm >> 16) & 0xffff,
830 comm & 0xffff,
831 (tlen>4) ? ", " : "");
832 break;
833 }
834 tlen -=4;
835 tptr +=4;
836 }
837 break;
838 case BGPTYPE_ORIGINATOR_ID:
839 if (len != 4) {
840 printf("invalid len");
841 break;
842 }
843 printf("%s",getname(tptr));
844 break;
845 case BGPTYPE_CLUSTER_LIST:
846 while (tlen>0) {
847 printf("%s%s",
848 getname(tptr),
849 (tlen>4) ? ", " : "");
850 tlen -=4;
851 tptr +=4;
852 }
853 break;
854 case BGPTYPE_MP_REACH_NLRI:
855 af = EXTRACT_16BITS(tptr);
856 safi = tptr[2];
857
858 printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
859 tok2str(bgp_afi_values, "Unknown AFI", af),
860 af,
861 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
862 tok2str(bgp_safi_values, "Unknown SAFI", safi),
863 safi);
864
865 if (af == AFNUM_INET || af==AFNUM_L2VPN)
866 ;
867 #ifdef INET6
868 else if (af == AFNUM_INET6)
869 ;
870 #endif
871 else {
872 printf("\n\t no AFI %u decoder",af);
873 if (vflag <= 1)
874 print_unknown_data(tptr,"\n\t ",tlen);
875 break;
876 }
877
878 tptr +=3;
879
880 tlen = tptr[0];
881 tptr++;
882
883 if (tlen) {
884 printf("\n\t nexthop: ");
885 while (tlen > 0) {
886 switch (af) {
887 case AFNUM_INET:
888 switch(safi) {
889 case SAFNUM_UNICAST:
890 case SAFNUM_MULTICAST:
891 case SAFNUM_UNIMULTICAST:
892 case SAFNUM_LABUNICAST:
893 case SAFNUM_RT_ROUTING_INFO:
894 printf("%s",getname(tptr));
895 tlen -= sizeof(struct in_addr);
896 tptr += sizeof(struct in_addr);
897 break;
898 case SAFNUM_VPNUNICAST:
899 case SAFNUM_VPNMULTICAST:
900 case SAFNUM_VPNUNIMULTICAST:
901 printf("RD: %s, %s",
902 bgp_vpn_rd_print(tptr),
903 getname(tptr+BGP_VPN_RD_LEN));
904 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
905 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
906 break;
907 default:
908 printf("no SAFI %u decoder",safi);
909 if (vflag <= 1)
910 print_unknown_data(tptr,"\n\t ",tlen);
911 break;
912 }
913 break;
914 #ifdef INET6
915 case AFNUM_INET6:
916 switch(safi) {
917 case SAFNUM_UNICAST:
918 case SAFNUM_MULTICAST:
919 case SAFNUM_UNIMULTICAST:
920 case SAFNUM_LABUNICAST:
921 case SAFNUM_RT_ROUTING_INFO:
922 printf("%s", getname6(tptr));
923 tlen -= sizeof(struct in6_addr);
924 tptr += sizeof(struct in6_addr);
925 break;
926 case SAFNUM_VPNUNICAST:
927 case SAFNUM_VPNMULTICAST:
928 case SAFNUM_VPNUNIMULTICAST:
929 printf("RD: %s, %s",
930 bgp_vpn_rd_print(tptr),
931 getname6(tptr+BGP_VPN_RD_LEN));
932 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
933 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
934 break;
935 default:
936 printf("no SAFI %u decoder",safi);
937 if (vflag <= 1)
938 print_unknown_data(tptr,"\n\t ",tlen);
939 break;
940 }
941 break;
942 #endif
943 case AFNUM_L2VPN:
944 switch(safi) {
945 case SAFNUM_VPNUNICAST:
946 case SAFNUM_VPNMULTICAST:
947 case SAFNUM_VPNUNIMULTICAST:
948 printf("%s", getname(tptr));
949 tlen -= (sizeof(struct in_addr));
950 tptr += (sizeof(struct in_addr));
951 break;
952 default:
953 printf("no SAFI %u decoder",safi);
954 if (vflag <= 1)
955 print_unknown_data(tptr,"\n\t ",tlen);
956 break;
957 }
958 break;
959
960 default:
961 printf("no AFI %u decoder",af);
962 if (vflag <= 1)
963 print_unknown_data(tptr,"\n\t ",tlen);
964 break;
965 }
966 }
967 }
968 tptr += tlen;
969
970 snpa = tptr[0];
971 tptr++;
972
973 if (snpa) {
974 printf("\n\t %u SNPA", snpa);
975 for (/*nothing*/; snpa > 0; snpa--) {
976 printf("\n\t %d bytes", tptr[0]);
977 tptr += tptr[0] + 1;
978 }
979 } else {
980 printf(", no SNPA");
981 }
982
983 while (len - (tptr - pptr) > 0) {
984 switch (af) {
985 case AFNUM_INET:
986 switch (safi) {
987 case SAFNUM_UNICAST:
988 case SAFNUM_MULTICAST:
989 case SAFNUM_UNIMULTICAST:
990 advance = decode_prefix4(tptr, buf, sizeof(buf));
991 if (advance >= 0)
992 printf("\n\t %s", buf);
993 else
994 printf("\n\t (illegal prefix length)");
995 break;
996 case SAFNUM_LABUNICAST:
997 advance = decode_labeled_prefix4(tptr, buf, sizeof(buf));
998 printf("\n\t %s", buf);
999 break;
1000 case SAFNUM_VPNUNICAST:
1001 case SAFNUM_VPNMULTICAST:
1002 case SAFNUM_VPNUNIMULTICAST:
1003 advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf));
1004 printf("\n\t %s", buf);
1005 break;
1006 case SAFNUM_RT_ROUTING_INFO:
1007 advance = decode_rt_routing_info(tptr, buf, sizeof(buf));
1008 printf("\n\t %s", buf);
1009 break;
1010 default:
1011 printf("\n\t no SAFI %u decoder",safi);
1012 if (vflag <= 1)
1013 print_unknown_data(tptr-3,"\n\t ",tlen);
1014 advance = 0;
1015 tptr = pptr + len;
1016 break;
1017 }
1018 break;
1019 #ifdef INET6
1020 case AFNUM_INET6:
1021 switch (safi) {
1022 case SAFNUM_UNICAST:
1023 case SAFNUM_MULTICAST:
1024 case SAFNUM_UNIMULTICAST:
1025 advance = decode_prefix6(tptr, buf, sizeof(buf));
1026 printf("\n\t %s", buf);
1027 break;
1028 case SAFNUM_LABUNICAST:
1029 advance = decode_labeled_prefix6(tptr, buf, sizeof(buf));
1030 printf("\n\t %s", buf);
1031 break;
1032 case SAFNUM_VPNUNICAST:
1033 case SAFNUM_VPNMULTICAST:
1034 case SAFNUM_VPNUNIMULTICAST:
1035 advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf));
1036 printf("\n\t %s", buf);
1037 break;
1038 case SAFNUM_RT_ROUTING_INFO:
1039 advance = decode_rt_routing_info(tptr, buf, sizeof(buf));
1040 printf("\n\t %s", buf);
1041 break;
1042 default:
1043 printf("\n\t no SAFI %u decoder ",safi);
1044 if (vflag <= 1)
1045 print_unknown_data(tptr-3,"\n\t ",tlen);
1046 advance = 0;
1047 tptr = pptr + len;
1048 break;
1049 }
1050 break;
1051 #endif
1052 case AFNUM_L2VPN:
1053 switch(safi) {
1054 case SAFNUM_VPNUNICAST:
1055 case SAFNUM_VPNMULTICAST:
1056 case SAFNUM_VPNUNIMULTICAST:
1057 advance = decode_labeled_vpn_l2(tptr, buf, sizeof(buf));
1058 printf("\n\t %s", buf);
1059 break;
1060 default:
1061 printf("no SAFI %u decoder",safi);
1062 if (vflag <= 1)
1063 print_unknown_data(tptr,"\n\t ",tlen);
1064 advance = 0;
1065 tptr = pptr + len;
1066 break;
1067 }
1068 break;
1069
1070
1071 default:
1072 printf("\n\t no AFI %u decoder ",af);
1073 if (vflag <= 1)
1074 print_unknown_data(tptr-3,"\n\t ",tlen);
1075 advance = 0;
1076 tptr = pptr + len;
1077 break;
1078 }
1079 tptr += advance;
1080 }
1081 break;
1082
1083 case BGPTYPE_MP_UNREACH_NLRI:
1084 af = EXTRACT_16BITS(tptr);
1085 safi = tptr[2];
1086
1087 printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1088 tok2str(bgp_afi_values, "Unknown AFI", af),
1089 af,
1090 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1091 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1092 safi);
1093
1094 tptr += 3;
1095
1096 while (len - (tptr - pptr) > 0) {
1097 switch (af) {
1098 case AFNUM_INET:
1099 switch (safi) {
1100 case SAFNUM_UNICAST:
1101 case SAFNUM_MULTICAST:
1102 case SAFNUM_UNIMULTICAST:
1103 advance = decode_prefix4(tptr, buf, sizeof(buf));
1104 if (advance >= 0)
1105 printf("\n\t %s", buf);
1106 else
1107 printf("\n\t (illegal prefix length)");
1108 break;
1109 case SAFNUM_LABUNICAST:
1110 advance = decode_labeled_prefix4(tptr, buf, sizeof(buf));
1111 printf("\n\t %s", buf);
1112 break;
1113 case SAFNUM_VPNUNICAST:
1114 case SAFNUM_VPNMULTICAST:
1115 case SAFNUM_VPNUNIMULTICAST:
1116 advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf));
1117 printf("\n\t %s", buf);
1118 break;
1119 default:
1120 printf("\n\t no SAFI %u decoder",safi);
1121 if (vflag <= 1)
1122 print_unknown_data(tptr-3,"\n\t ",tlen);
1123 advance = 0;
1124 tptr = pptr + len;
1125 break;
1126 }
1127 break;
1128
1129 #ifdef INET6
1130 case AFNUM_INET6:
1131 switch (safi) {
1132 case SAFNUM_UNICAST:
1133 case SAFNUM_MULTICAST:
1134 case SAFNUM_UNIMULTICAST:
1135 advance = decode_prefix6(tptr, buf, sizeof(buf));
1136 printf("\n\t %s", buf);
1137 break;
1138 case SAFNUM_LABUNICAST:
1139 advance = decode_labeled_prefix6(tptr, buf, sizeof(buf));
1140 printf("\n\t %s", buf);
1141 break;
1142 case SAFNUM_VPNUNICAST:
1143 case SAFNUM_VPNMULTICAST:
1144 case SAFNUM_VPNUNIMULTICAST:
1145 advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf));
1146 printf("\n\t %s", buf);
1147 break;
1148 default:
1149 printf("\n\t no SAFI %u decoder",safi);
1150 if (vflag <= 1)
1151 print_unknown_data(tptr-3,"\n\t ",tlen);
1152 advance = 0;
1153 tptr = pptr + len;
1154 break;
1155 }
1156 break;
1157 #endif
1158
1159 case AFNUM_L2VPN:
1160 switch(safi) {
1161 case SAFNUM_VPNUNICAST:
1162 case SAFNUM_VPNMULTICAST:
1163 case SAFNUM_VPNUNIMULTICAST:
1164 advance = decode_labeled_vpn_l2(tptr, buf, sizeof(buf));
1165 printf("\n\t %s", buf);
1166 break;
1167 default:
1168 printf("no SAFI %u decoder",safi);
1169 if (vflag <= 1)
1170 print_unknown_data(tptr-3,"\n\t ",tlen);
1171 advance = 0;
1172 tptr = pptr + len;
1173 break;
1174 }
1175 break;
1176
1177 default:
1178 printf("\n\t no AFI %u decoder",af);
1179 if (vflag <= 1)
1180 print_unknown_data(tptr-3,"\n\t ",tlen);
1181 advance = 0;
1182 tptr = pptr + len;
1183 break;
1184 }
1185
1186 tptr += advance;
1187 }
1188 break;
1189 case BGPTYPE_EXTD_COMMUNITIES:
1190 if (len % 8) {
1191 printf("invalid len");
1192 break;
1193 }
1194 while (tlen>0) {
1195 u_int16_t extd_comm;
1196 extd_comm=EXTRACT_16BITS(tptr);
1197
1198 printf("\n\t %s (0x%04x), Flags [%s]",
1199 tok2str(bgp_extd_comm_subtype_values, "unknown extd community typecode", extd_comm),
1200 extd_comm,
1201 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm));
1202
1203 switch(extd_comm) {
1204 case BGP_EXT_COM_RT_0:
1205 case BGP_EXT_COM_RO_0:
1206 printf(": %u:%s",
1207 EXTRACT_16BITS(tptr+2),
1208 getname(tptr+4));
1209 break;
1210 case BGP_EXT_COM_RT_1:
1211 case BGP_EXT_COM_RO_1:
1212 printf(": %s:%u",
1213 getname(tptr+2),
1214 EXTRACT_16BITS(tptr+6));
1215 break;
1216 case BGP_EXT_COM_RT_2:
1217 case BGP_EXT_COM_RO_2:
1218 printf(": %u:%u",
1219 EXTRACT_32BITS(tptr+2),
1220 EXTRACT_16BITS(tptr+6));
1221 break;
1222 case BGP_EXT_COM_LINKBAND:
1223 bw.i = EXTRACT_32BITS(tptr+2);
1224 printf(": bandwidth: %.3f Mbps",
1225 bw.f*8/1000000);
1226 break;
1227 case BGP_EXT_COM_CISCO_MCAST:
1228 printf(": AS %u, group %s",
1229 EXTRACT_16BITS(tptr+2),
1230 getname(tptr+4));
1231 break;
1232 case BGP_EXT_COM_VPN_ORIGIN:
1233 case BGP_EXT_COM_VPN_ORIGIN2:
1234 case BGP_EXT_COM_VPN_ORIGIN3:
1235 case BGP_EXT_COM_VPN_ORIGIN4:
1236 case BGP_EXT_COM_OSPF_RID:
1237 case BGP_EXT_COM_OSPF_RID2:
1238 printf("%s", getname(tptr+2));
1239 break;
1240 case BGP_EXT_COM_OSPF_RTYPE:
1241 case BGP_EXT_COM_OSPF_RTYPE2:
1242 printf(": area:%s, router-type:%s, metric-type:%s%s",
1243 getname(tptr+2),
1244 tok2str(bgp_extd_comm_ospf_rtype_values,
1245 "unknown (0x%02x)",
1246 *(tptr+6)),
1247 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
1248 (*(tptr+6) == (BGP_OSPF_RTYPE_EXT ||BGP_OSPF_RTYPE_NSSA )) ? "E1" : "");
1249 break;
1250 case BGP_EXT_COM_L2INFO:
1251 printf(": %s Control Flags [0x%02x]:MTU %u",
1252 tok2str(bgp_l2vpn_encaps_values,
1253 "unknown encaps",
1254 *(tptr+2)),
1255 *(tptr+3),
1256 EXTRACT_16BITS(tptr+4));
1257 break;
1258 default:
1259 print_unknown_data(tptr,"\n\t ",8);
1260 break;
1261 }
1262 tlen -=8;
1263 tptr +=8;
1264 }
1265 break;
1266
1267 case BGPTYPE_ATTR_SET:
1268 printf("\n\t Origin AS: %u", EXTRACT_32BITS(tptr));
1269 tptr+=4;
1270 len -=4;
1271
1272 while (len >= 2 ) {
1273 int alen;
1274 struct bgp_attr bgpa;
1275
1276 memcpy(&bgpa, tptr, sizeof(bgpa));
1277 alen = bgp_attr_len(&bgpa);
1278 tptr += bgp_attr_off(&bgpa);
1279 len -= bgp_attr_off(&bgpa);
1280
1281 printf("\n\t %s (%u), length: %u",
1282 tok2str(bgp_attr_values, "Unknown Attribute", bgpa.bgpa_type),
1283 bgpa.bgpa_type,
1284 alen);
1285
1286 if (bgpa.bgpa_flags) {
1287 printf(", Flags [%s%s%s%s",
1288 bgpa.bgpa_flags & 0x80 ? "O" : "",
1289 bgpa.bgpa_flags & 0x40 ? "T" : "",
1290 bgpa.bgpa_flags & 0x20 ? "P" : "",
1291 bgpa.bgpa_flags & 0x10 ? "E" : "");
1292 if (bgpa.bgpa_flags & 0xf)
1293 printf("+%x", bgpa.bgpa_flags & 0xf);
1294 printf("]: ");
1295 }
1296 bgp_attr_print(&bgpa, tptr, alen); /* FIXME check for recursion */
1297 tptr += alen;
1298 len -= alen;
1299 }
1300 break;
1301
1302
1303 default:
1304 printf("\n\t no Attribute %u decoder",attr->bgpa_type); /* we have no decoder for the attribute */
1305 if (vflag <= 1)
1306 print_unknown_data(pptr,"\n\t ",len);
1307 break;
1308 }
1309 if (vflag > 1 && len) /* omit zero length attributes*/
1310 print_unknown_data(pptr,"\n\t ",len);
1311 }
1312
1313 static void
1314 bgp_open_print(const u_char *dat, int length)
1315 {
1316 struct bgp_open bgpo;
1317 struct bgp_opt bgpopt;
1318 int hlen;
1319 const u_char *opt;
1320 int i,cap_type,cap_len,tcap_len,cap_offset;
1321
1322 TCHECK2(dat[0], BGP_OPEN_SIZE);
1323 memcpy(&bgpo, dat, BGP_OPEN_SIZE);
1324 hlen = ntohs(bgpo.bgpo_len);
1325
1326 printf("\n\t Version %d, ", bgpo.bgpo_version);
1327 printf("my AS %u, ", ntohs(bgpo.bgpo_myas));
1328 printf("Holdtime %us, ", ntohs(bgpo.bgpo_holdtime));
1329 printf("ID %s", getname((u_char *)&bgpo.bgpo_id));
1330 printf("\n\t Optional parameters, length: %u", bgpo.bgpo_optlen);
1331
1332 /* some little sanity checking */
1333 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE)
1334 return;
1335
1336 /* ugly! */
1337 opt = &((const struct bgp_open *)dat)->bgpo_optlen;
1338 opt++;
1339
1340 i = 0;
1341 while (i < bgpo.bgpo_optlen) {
1342 TCHECK2(opt[i], BGP_OPT_SIZE);
1343 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE);
1344 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
1345 printf("\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len);
1346 break;
1347 }
1348
1349 printf("\n\t Option %s (%u), length: %u",
1350 tok2str(bgp_opt_values,"Unknown", bgpopt.bgpopt_type),
1351 bgpopt.bgpopt_type,
1352 bgpopt.bgpopt_len);
1353
1354 /* now lets decode the options we know*/
1355 switch(bgpopt.bgpopt_type) {
1356 case BGP_OPT_CAP:
1357 cap_type=opt[i+BGP_OPT_SIZE];
1358 cap_len=opt[i+BGP_OPT_SIZE+1];
1359 tcap_len=cap_len;
1360 printf("\n\t %s, length: %u",
1361 tok2str(bgp_capcode_values,"Unknown", cap_type),
1362 cap_len);
1363 switch(cap_type) {
1364 case BGP_CAPCODE_MP:
1365 printf("\n\t\tAFI %s (%u), SAFI %s (%u)",
1366 tok2str(bgp_afi_values,"Unknown", EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2)),
1367 EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2),
1368 tok2str(bgp_safi_values,"Unknown", opt[i+BGP_OPT_SIZE+5]),
1369 opt[i+BGP_OPT_SIZE+5]);
1370 break;
1371 case BGP_CAPCODE_RESTART:
1372 printf("\n\t\tRestart Flags: [%s], Restart Time %us",
1373 ((opt[i+BGP_OPT_SIZE+2])&0x80) ? "R" : "none",
1374 EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2)&0xfff);
1375 tcap_len-=2;
1376 cap_offset=4;
1377 while(tcap_len>=4) {
1378 printf("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
1379 tok2str(bgp_afi_values,"Unknown", EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+cap_offset)),
1380 EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+cap_offset),
1381 tok2str(bgp_safi_values,"Unknown", opt[i+BGP_OPT_SIZE+cap_offset+2]),
1382 opt[i+BGP_OPT_SIZE+cap_offset+2],
1383 ((opt[i+BGP_OPT_SIZE+cap_offset+3])&0x80) ? "yes" : "no" );
1384 tcap_len-=4;
1385 cap_offset+=4;
1386 }
1387 break;
1388 case BGP_CAPCODE_RR:
1389 case BGP_CAPCODE_RR_CISCO:
1390 break;
1391 default:
1392 printf("\n\t\tno decoder for Capability %u",
1393 cap_type);
1394 if (vflag <= 1)
1395 print_unknown_data(&opt[i+BGP_OPT_SIZE+2],"\n\t\t",cap_len);
1396 break;
1397 }
1398 if (vflag > 1)
1399 print_unknown_data(&opt[i+BGP_OPT_SIZE+2],"\n\t\t",cap_len);
1400 break;
1401 case BGP_OPT_AUTH:
1402 default:
1403 printf("\n\t no decoder for option %u",
1404 bgpopt.bgpopt_type);
1405 break;
1406 }
1407
1408 i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
1409 }
1410 return;
1411 trunc:
1412 printf("[|BGP]");
1413 }
1414
1415 static void
1416 bgp_update_print(const u_char *dat, int length)
1417 {
1418 struct bgp bgp;
1419 struct bgp_attr bgpa;
1420 int hlen;
1421 const u_char *p;
1422 int len;
1423 int i;
1424
1425 TCHECK2(dat[0], BGP_SIZE);
1426 memcpy(&bgp, dat, BGP_SIZE);
1427 hlen = ntohs(bgp.bgp_len);
1428 p = dat + BGP_SIZE; /*XXX*/
1429
1430 /* Unfeasible routes */
1431 len = EXTRACT_16BITS(p);
1432 if (len) {
1433 /*
1434 * Without keeping state from the original NLRI message,
1435 * it's not possible to tell if this a v4 or v6 route,
1436 * so only try to decode it if we're not v6 enabled.
1437 */
1438 #ifdef INET6
1439 printf("\n\t Withdrawn routes: %d bytes", len);
1440 #else
1441 char buf[MAXHOSTNAMELEN + 100];
1442 int wpfx;
1443
1444 TCHECK2(p[2], len);
1445 i = 2;
1446
1447 printf("\n\t Withdrawn routes:");
1448
1449 while(i < 2 + len) {
1450 wpfx = decode_prefix4(&p[i], buf, sizeof(buf));
1451 if (wpfx >= 0) {
1452 i += wpfx;
1453 printf("\n\t %s", buf);
1454 } else {
1455 printf("\n\t (illegal prefix length)");
1456 break;
1457 }
1458 }
1459 #endif
1460 }
1461 p += 2 + len;
1462
1463 TCHECK2(p[0], 2);
1464 len = EXTRACT_16BITS(p);
1465 if (len) {
1466 /* do something more useful!*/
1467 i = 2;
1468 while (i < 2 + len) {
1469 int alen, aoff;
1470
1471 TCHECK2(p[i], sizeof(bgpa));
1472 memcpy(&bgpa, &p[i], sizeof(bgpa));
1473 alen = bgp_attr_len(&bgpa);
1474 aoff = bgp_attr_off(&bgpa);
1475
1476 printf("\n\t %s (%u), length: %u",
1477 tok2str(bgp_attr_values, "Unknown Attribute", bgpa.bgpa_type),
1478 bgpa.bgpa_type,
1479 alen);
1480
1481 if (bgpa.bgpa_flags) {
1482 printf(", Flags [%s%s%s%s",
1483 bgpa.bgpa_flags & 0x80 ? "O" : "",
1484 bgpa.bgpa_flags & 0x40 ? "T" : "",
1485 bgpa.bgpa_flags & 0x20 ? "P" : "",
1486 bgpa.bgpa_flags & 0x10 ? "E" : "");
1487 if (bgpa.bgpa_flags & 0xf)
1488 printf("+%x", bgpa.bgpa_flags & 0xf);
1489 printf("]: ");
1490 }
1491 bgp_attr_print(&bgpa, &p[i + aoff], alen);
1492 i += aoff + alen;
1493 }
1494 }
1495 p += 2 + len;
1496
1497 if (dat + length > p) {
1498 printf("\n\t Updated routes:");
1499 while (dat + length > p) {
1500 char buf[MAXHOSTNAMELEN + 100];
1501 i = decode_prefix4(p, buf, sizeof(buf));
1502 if (i >= 0) {
1503 printf("\n\t %s", buf);
1504 p += i;
1505 } else {
1506 printf("\n\t (illegal prefix length)");
1507 break;
1508 }
1509 }
1510 }
1511 return;
1512 trunc:
1513 printf("[|BGP]");
1514 }
1515
1516 static void
1517 bgp_notification_print(const u_char *dat, int length)
1518 {
1519 struct bgp_notification bgpn;
1520 int hlen;
1521 const u_char *tptr;
1522
1523 TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
1524 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
1525 hlen = ntohs(bgpn.bgpn_len);
1526
1527 /* some little sanity checking */
1528 if (length<BGP_NOTIFICATION_SIZE)
1529 return;
1530
1531 printf(", %s (%u)",
1532 tok2str(bgp_notify_major_values, "Unknown Error", bgpn.bgpn_major),
1533 bgpn.bgpn_major);
1534
1535 switch (bgpn.bgpn_major) {
1536
1537 case BGP_NOTIFY_MAJOR_MSG:
1538 printf(", subcode %s (%u)",
1539 tok2str(bgp_notify_minor_msg_values, "Unknown", bgpn.bgpn_minor),
1540 bgpn.bgpn_minor);
1541 break;
1542 case BGP_NOTIFY_MAJOR_OPEN:
1543 printf(", subcode %s (%u)",
1544 tok2str(bgp_notify_minor_open_values, "Unknown", bgpn.bgpn_minor),
1545 bgpn.bgpn_minor);
1546 break;
1547 case BGP_NOTIFY_MAJOR_UPDATE:
1548 printf(", subcode %s (%u)",
1549 tok2str(bgp_notify_minor_update_values, "Unknown", bgpn.bgpn_minor),
1550 bgpn.bgpn_minor);
1551 break;
1552 case BGP_NOTIFY_MAJOR_CAP:
1553 printf(" subcode %s (%u)",
1554 tok2str(bgp_notify_minor_cap_values, "Unknown", bgpn.bgpn_minor),
1555 bgpn.bgpn_minor);
1556 case BGP_NOTIFY_MAJOR_CEASE:
1557 printf(", subcode %s (%u)",
1558 tok2str(bgp_notify_minor_cease_values, "Unknown", bgpn.bgpn_minor),
1559 bgpn.bgpn_minor);
1560
1561 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
1562 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
1563 */
1564 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
1565 tptr = dat + BGP_NOTIFICATION_SIZE;
1566 TCHECK2(*tptr, 7);
1567 printf(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
1568 tok2str(bgp_afi_values, "Unknown", EXTRACT_16BITS(tptr)),
1569 EXTRACT_16BITS(tptr),
1570 tok2str(bgp_safi_values, "Unknown", *(tptr+2)),
1571 *(tptr+2),
1572 EXTRACT_32BITS(tptr+3));
1573 }
1574 break;
1575 default:
1576 break;
1577 }
1578
1579 return;
1580 trunc:
1581 printf("[|BGP]");
1582 }
1583
1584 static void
1585 bgp_route_refresh_print(const u_char *pptr, int len) {
1586
1587 const struct bgp_route_refresh *bgp_route_refresh_header;
1588 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
1589
1590 printf("\n\t AFI %s (%u), SAFI %s (%u)",
1591 tok2str(bgp_afi_values,"Unknown",
1592 EXTRACT_16BITS(&bgp_route_refresh_header->afi)), /* this stinks but the compiler pads the structure weird */
1593 EXTRACT_16BITS(&bgp_route_refresh_header->afi),
1594 tok2str(bgp_safi_values,"Unknown",
1595 bgp_route_refresh_header->safi),
1596 bgp_route_refresh_header->safi);
1597
1598 if (vflag > 1)
1599 print_unknown_data(pptr,"\n\t ", len);
1600
1601 return;
1602 }
1603
1604 static void
1605 bgp_header_print(const u_char *dat, int length)
1606 {
1607 struct bgp bgp;
1608
1609 TCHECK2(dat[0], BGP_SIZE);
1610 memcpy(&bgp, dat, BGP_SIZE);
1611 printf("\n\t%s Message (%u), length: %u",
1612 tok2str(bgp_msg_values, "Unknown", bgp.bgp_type),
1613 bgp.bgp_type,
1614 length);
1615
1616 switch (bgp.bgp_type) {
1617 case BGP_OPEN:
1618 bgp_open_print(dat, length);
1619 break;
1620 case BGP_UPDATE:
1621 bgp_update_print(dat, length);
1622 break;
1623 case BGP_NOTIFICATION:
1624 bgp_notification_print(dat, length);
1625 break;
1626 case BGP_KEEPALIVE:
1627 break;
1628 case BGP_ROUTE_REFRESH:
1629 bgp_route_refresh_print(dat, length);
1630 break;
1631 default:
1632 /* we have no decoder for the BGP message */
1633 printf("\n\t no Message %u decoder",bgp.bgp_type);
1634 print_unknown_data(dat,"\n\t ",length);
1635 break;
1636 }
1637 return;
1638 trunc:
1639 printf("[|BGP]");
1640 }
1641
1642 void
1643 bgp_print(const u_char *dat, int length)
1644 {
1645 const u_char *p;
1646 const u_char *ep;
1647 const u_char *start;
1648 const u_char marker[] = {
1649 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
1650 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
1651 };
1652 struct bgp bgp;
1653 u_int16_t hlen;
1654
1655 ep = dat + length;
1656 if (snapend < dat + length)
1657 ep = snapend;
1658
1659 printf(": BGP, length: %u",length);
1660
1661 if (vflag < 1) /* lets be less chatty */
1662 return;
1663
1664 p = dat;
1665 start = p;
1666 while (p < snapend) {
1667 if (!TTEST2(p[0], 1))
1668 break;
1669 if (p[0] != 0xff) {
1670 p++;
1671 continue;
1672 }
1673
1674 if (!TTEST2(p[0], sizeof(marker)))
1675 break;
1676 if (memcmp(p, marker, sizeof(marker)) != 0) {
1677 p++;
1678 continue;
1679 }
1680
1681 /* found BGP header */
1682 TCHECK2(p[0], BGP_SIZE); /*XXX*/
1683 memcpy(&bgp, p, BGP_SIZE);
1684
1685 if (start != p)
1686 printf(" [|BGP]");
1687
1688 hlen = ntohs(bgp.bgp_len);
1689 if (hlen < BGP_SIZE) {
1690 printf("\n[|BGP Bogus header length %u < %u]", hlen,
1691 BGP_SIZE);
1692 break;
1693 }
1694
1695 if (TTEST2(p[0], hlen)) {
1696 bgp_header_print(p, hlen);
1697 p += hlen;
1698 start = p;
1699 } else {
1700 printf("\n[|BGP %s]", tok2str(bgp_msg_values, "Unknown Message Type",bgp.bgp_type));
1701 break;
1702 }
1703 }
1704
1705 return;
1706
1707 trunc:
1708 printf(" [|BGP]");
1709 }
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