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[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[] =
39 "@(#) $Header: /tcpdump/master/tcpdump/print-bgp.c,v 1.69 2003-07-01 08:33:43 guy 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
143 static struct tok bgp_attr_values[] = {
144 { BGPTYPE_ORIGIN, "Origin"},
145 { BGPTYPE_AS_PATH, "AS Path"},
146 { BGPTYPE_NEXT_HOP, "Next Hop"},
147 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
148 { BGPTYPE_LOCAL_PREF, "Local Preference"},
149 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
150 { BGPTYPE_AGGREGATOR, "Aggregator"},
151 { BGPTYPE_COMMUNITIES, "Community"},
152 { BGPTYPE_ORIGINATOR_ID, "Originator ID"},
153 { BGPTYPE_CLUSTER_LIST, "Cluster List"},
154 { BGPTYPE_DPA, "DPA"},
155 { BGPTYPE_ADVERTISERS, "Advertisers"},
156 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"},
157 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
158 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
159 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
160 { 255, "Reserved for development"},
161 { 0, NULL}
162 };
163
164 #define BGP_OPT_AUTH 1
165 #define BGP_OPT_CAP 2
166
167
168 static struct tok bgp_opt_values[] = {
169 { BGP_OPT_AUTH, "Authentication Information"},
170 { BGP_OPT_CAP, "Capabilities Advertisement"},
171 { 0, NULL}
172 };
173
174 #define BGP_CAPCODE_MP 1
175 #define BGP_CAPCODE_RR 2
176 #define BGP_CAPCODE_RESTART 64 /* draft-ietf-idr-restart-05 */
177 #define BGP_CAPCODE_RR_CISCO 128
178
179 static struct tok bgp_capcode_values[] = {
180 { BGP_CAPCODE_MP, "Multiprotocol Extensions"},
181 { BGP_CAPCODE_RR, "Route Refresh"},
182 { BGP_CAPCODE_RESTART, "Graceful Restart"},
183 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
184 { 0, NULL}
185 };
186
187 #define BGP_NOTIFY_MAJOR_MSG 1
188 #define BGP_NOTIFY_MAJOR_OPEN 2
189 #define BGP_NOTIFY_MAJOR_UPDATE 3
190 #define BGP_NOTIFY_MAJOR_HOLDTIME 4
191 #define BGP_NOTIFY_MAJOR_FSM 5
192 #define BGP_NOTIFY_MAJOR_CEASE 6
193 #define BGP_NOTIFY_MAJOR_CAP 7
194
195 static struct tok bgp_notify_major_values[] = {
196 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
197 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
198 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
199 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
200 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
201 { BGP_NOTIFY_MAJOR_CEASE, "Cease"},
202 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"},
203 { 0, NULL}
204 };
205
206 /* draft-ietf-idr-cease-subcode-02 */
207 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
208 static struct tok bgp_notify_minor_cease_values[] = {
209 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
210 { 2, "Administratively Shutdown"},
211 { 3, "Peer Unconfigured"},
212 { 4, "Administratively Reset"},
213 { 5, "Connection Rejected"},
214 { 6, "Other Configuration Change"},
215 { 7, "Connection Collision Resolution"},
216 { 0, NULL}
217 };
218
219 static struct tok bgp_notify_minor_msg_values[] = {
220 { 1, "Connection Not Synchronized"},
221 { 2, "Bad Message Length"},
222 { 3, "Bad Message Type"},
223 { 0, NULL}
224 };
225
226 static struct tok bgp_notify_minor_open_values[] = {
227 { 1, "Unsupported Version Number"},
228 { 2, "Bad Peer AS"},
229 { 3, "Bad BGP Identifier"},
230 { 4, "Unsupported Optional Parameter"},
231 { 5, "Authentication Failure"},
232 { 6, "Unacceptable Hold Time"},
233 { 0, NULL}
234 };
235
236 static struct tok bgp_notify_minor_update_values[] = {
237 { 1, "Malformed Attribute List"},
238 { 2, "Unrecognized Well-known Attribute"},
239 { 3, "Missing Well-known Attribute"},
240 { 4, "Attribute Flags Error"},
241 { 5, "Attribute Length Error"},
242 { 6, "Invalid ORIGIN Attribute"},
243 { 7, "AS Routing Loop"},
244 { 8, "Invalid NEXT_HOP Attribute"},
245 { 9, "Optional Attribute Error"},
246 { 10, "Invalid Network Field"},
247 { 11, "Malformed AS_PATH"},
248 { 0, NULL}
249 };
250
251 static struct tok bgp_notify_minor_cap_values[] = {
252 { 1, "Invalid Action Value" },
253 { 2, "Invalid Capability Length" },
254 { 3, "Malformed Capability Value" },
255 { 4, "Unsupported Capability Code" },
256 { 0, NULL }
257 };
258
259 static struct tok bgp_origin_values[] = {
260 { 0, "IGP"},
261 { 1, "EGP"},
262 { 2, "Incomplete"},
263 { 0, NULL}
264 };
265
266 /* Subsequent address family identifier, RFC2283 section 7 */
267 #define SAFNUM_RES 0
268 #define SAFNUM_UNICAST 1
269 #define SAFNUM_MULTICAST 2
270 #define SAFNUM_UNIMULTICAST 3
271 /* labeled BGP RFC3107 */
272 #define SAFNUM_LABUNICAST 4
273 /* Section 4.3.4 of draft-rosen-rfc2547bis-03.txt */
274 #define SAFNUM_VPNUNICAST 128
275 #define SAFNUM_VPNMULTICAST 129
276 #define SAFNUM_VPNUNIMULTICAST 130
277
278 #define BGP_VPN_RD_LEN 8
279
280 static struct tok bgp_safi_values[] = {
281 { SAFNUM_RES, "Reserved"},
282 { SAFNUM_UNICAST, "Unicast"},
283 { SAFNUM_MULTICAST, "Multicast"},
284 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
285 { SAFNUM_LABUNICAST, "labeled Unicast"},
286 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
287 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
288 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
289 { 0, NULL }
290 };
291
292 /* well-known community */
293 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01
294 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02
295 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
296
297 /* RFC1700 address family numbers */
298 #define AFNUM_INET 1
299 #define AFNUM_INET6 2
300 #define AFNUM_NSAP 3
301 #define AFNUM_HDLC 4
302 #define AFNUM_BBN1822 5
303 #define AFNUM_802 6
304 #define AFNUM_E163 7
305 #define AFNUM_E164 8
306 #define AFNUM_F69 9
307 #define AFNUM_X121 10
308 #define AFNUM_IPX 11
309 #define AFNUM_ATALK 12
310 #define AFNUM_DECNET 13
311 #define AFNUM_BANYAN 14
312 #define AFNUM_E164NSAP 15
313 /* draft-kompella-ppvpn-l2vpn */
314 #define AFNUM_L2VPN 196 /* still to be approved by IANA */
315
316 static struct tok bgp_afi_values[] = {
317 { 0, "Reserved"},
318 { AFNUM_INET, "IPv4"},
319 { AFNUM_INET6, "IPv6"},
320 { AFNUM_NSAP, "NSAP"},
321 { AFNUM_HDLC, "HDLC"},
322 { AFNUM_BBN1822, "BBN 1822"},
323 { AFNUM_802, "802"},
324 { AFNUM_E163, "E.163"},
325 { AFNUM_E164, "E.164"},
326 { AFNUM_F69, "F.69"},
327 { AFNUM_X121, "X.121"},
328 { AFNUM_IPX, "Novell IPX"},
329 { AFNUM_ATALK, "Appletalk"},
330 { AFNUM_DECNET, "Decnet IV"},
331 { AFNUM_BANYAN, "Banyan Vines"},
332 { AFNUM_E164NSAP, "E.164 with NSAP subaddress"},
333 { AFNUM_L2VPN, "Layer-2 VPN"},
334 { 0, NULL},
335 };
336
337 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */
338 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
339 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
340 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
341 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
342 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
343 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
344 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
345 /* rfc2547 bgp-mpls-vpns */
346
347 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
348 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatability */
349 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatability */
350 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatability */
351
352 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
353 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatability */
354
355 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
356 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatability */
357
358 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
359
360 static struct tok bgp_extd_comm_flag_values[] = {
361 { 0x8000, "vendor-specific"},
362 { 0x4000, "non-transitive"},
363 { 0, NULL},
364 };
365
366 static struct tok bgp_extd_comm_subtype_values[] = {
367 { BGP_EXT_COM_RT_0, "target"},
368 { BGP_EXT_COM_RT_1, "target"},
369 { BGP_EXT_COM_RT_2, "target"},
370 { BGP_EXT_COM_RO_0, "origin"},
371 { BGP_EXT_COM_RO_1, "origin"},
372 { BGP_EXT_COM_RO_2, "origin"},
373 { BGP_EXT_COM_LINKBAND, "link-BW"},
374 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
375 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
376 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
377 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
378 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
379 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
380 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
381 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
382 { BGP_EXT_COM_L2INFO, "layer2-info"},
383 { 0, NULL},
384 };
385
386 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
387 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
388 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
389 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
390 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
391 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
392 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
393 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
394
395 static struct tok bgp_extd_comm_ospf_rtype_values[] = {
396 { BGP_OSPF_RTYPE_RTR, "Router" },
397 { BGP_OSPF_RTYPE_NET, "Network" },
398 { BGP_OSPF_RTYPE_SUM, "Summary" },
399 { BGP_OSPF_RTYPE_EXT, "External" },
400 { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
401 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
402 { 0, NULL },
403 };
404
405 static struct tok bgp_l2vpn_encaps_values[] = {
406 { 0, "Reserved"},
407 { 1, "Frame Relay"},
408 { 2, "ATM AAL5 VCC transport"},
409 { 3, "ATM transparent cell transport"},
410 { 4, "Ethernet VLAN"},
411 { 5, "Ethernet"},
412 { 6, "Cisco-HDLC"},
413 { 7, "PPP"},
414 { 8, "CEM"},
415 { 9, "ATM VCC cell transport"},
416 { 10, "ATM VPC cell transport"},
417 { 11, "MPLS"},
418 { 12, "VPLS"},
419 { 64, "IP-interworking"},
420 { 0, NULL},
421 };
422
423 static int
424 decode_prefix4(const u_char *pptr, char *buf, u_int buflen)
425 {
426 struct in_addr addr;
427 u_int plen;
428
429 plen = pptr[0];
430 if (32 < plen)
431 return -1;
432
433 memset(&addr, 0, sizeof(addr));
434 memcpy(&addr, &pptr[1], (plen + 7) / 8);
435 if (plen % 8) {
436 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
437 ((0xff00 >> (plen % 8)) & 0xff);
438 }
439 snprintf(buf, buflen, "%s/%d", getname((u_char *)&addr), plen);
440 return 1 + (plen + 7) / 8;
441 }
442
443 static int
444 decode_labeled_prefix4(const u_char *pptr, char *buf, u_int buflen)
445 {
446 struct in_addr addr;
447 u_int plen;
448
449 plen = pptr[0]; /* get prefix length */
450
451 /* this is one of the weirdnesses of rfc3107
452 the label length (actually the label + COS bits)
453 is added to the prefix length;
454 we also do only read out just one label -
455 there is no real application for advertisement of
456 stacked labels in a a single BGP message
457 */
458
459 plen-=24; /* adjust prefixlen - labellength */
460
461 if (32 < plen)
462 return -1;
463
464 memset(&addr, 0, sizeof(addr));
465 memcpy(&addr, &pptr[4], (plen + 7) / 8);
466 if (plen % 8) {
467 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
468 ((0xff00 >> (plen % 8)) & 0xff);
469 }
470 /* the label may get offsetted by 4 bits so lets shift it right */
471 snprintf(buf, buflen, "%s/%d, label:%u %s",
472 getname((u_char *)&addr),
473 plen,
474 EXTRACT_24BITS(pptr+1)>>4,
475 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
476
477 return 4 + (plen + 7) / 8;
478 }
479
480 static char *
481 bgp_vpn_rd_print (const u_char *pptr) {
482
483 /* allocate space for the following string
484 * xxx.xxx.xxx.xxx:xxxxx
485 * 21 bytes plus one termination byte */
486 static char rd[22];
487 char *pos = rd;
488
489 /* ok lets load the RD format */
490 switch (EXTRACT_16BITS(pptr)) {
491 /* AS:IP-address fmt*/
492 case 0:
493 sprintf(pos, "%u:%u.%u.%u.%u",
494 EXTRACT_16BITS(pptr+2),
495 *(pptr+4),
496 *(pptr+5),
497 *(pptr+6),
498 *(pptr+7));
499 break;
500 /* IP-address:AS fmt*/
501 case 1:
502 sprintf(pos, "%u.%u.%u.%u:%u",
503 *(pptr+2),
504 *(pptr+3),
505 *(pptr+4),
506 *(pptr+5),
507 EXTRACT_16BITS(pptr+6));
508 break;
509 default:
510 sprintf(pos, "unknown RD format");
511 break;
512 }
513 pos+=strlen(pos);
514 *(pos) = '\0';
515 return (rd);
516 }
517
518 static int
519 decode_labeled_vpn_prefix4(const u_char *pptr, char *buf, u_int buflen)
520 {
521 struct in_addr addr;
522 u_int plen;
523
524 plen = pptr[0]; /* get prefix length */
525
526 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
527
528 if (32 < plen)
529 return -1;
530
531 memset(&addr, 0, sizeof(addr));
532 memcpy(&addr, &pptr[12], (plen + 7) / 8);
533 if (plen % 8) {
534 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
535 ((0xff00 >> (plen % 8)) & 0xff);
536 }
537 /* the label may get offsetted by 4 bits so lets shift it right */
538 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
539 bgp_vpn_rd_print(pptr+4),
540 getname((u_char *)&addr),
541 plen,
542 EXTRACT_24BITS(pptr+1)>>4,
543 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
544
545 return 12 + (plen + 7) / 8;
546 }
547
548 static int
549 decode_labeled_vpn_l2(const u_char *pptr, char *buf, u_int buflen)
550 {
551 int plen,tlen,strlen,tlv_type,tlv_len,ttlv_len;
552 plen=EXTRACT_16BITS(pptr);
553 tlen=plen;
554 pptr+=2;
555 strlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
556 bgp_vpn_rd_print(pptr),
557 EXTRACT_16BITS(pptr+8),
558 EXTRACT_16BITS(pptr+10),
559 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
560 pptr+=15;
561 tlen-=15;
562
563 /* ok now the variable part - lets read out TLVs*/
564 while (tlen>0) {
565 tlv_type=*pptr++;
566 tlv_len=EXTRACT_16BITS(pptr);
567 ttlv_len=tlv_len;
568 pptr+=2;
569
570 switch(tlv_type) {
571 case 1:
572 strlen+=snprintf(buf+strlen,buflen-strlen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
573 tlv_type,
574 tlv_len);
575 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
576 while (ttlv_len>0) {
577 strlen+=snprintf(buf+strlen,buflen-strlen, "%02x",*pptr++);
578 ttlv_len--;
579 }
580 break;
581 default:
582 snprintf(buf+strlen,buflen-strlen, "\n\t\tunknown TLV #%u, length: %u",
583 tlv_type,
584 tlv_len);
585 break;
586 }
587 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it tright */
588 }
589 return plen+2;
590 }
591
592 #ifdef INET6
593 static int
594 decode_prefix6(const u_char *pd, char *buf, u_int buflen)
595 {
596 struct in6_addr addr;
597 u_int plen;
598
599 plen = pd[0];
600 if (128 < plen)
601 return -1;
602
603 memset(&addr, 0, sizeof(addr));
604 memcpy(&addr, &pd[1], (plen + 7) / 8);
605 if (plen % 8) {
606 addr.s6_addr[(plen + 7) / 8 - 1] &=
607 ((0xff00 >> (plen % 8)) & 0xff);
608 }
609 snprintf(buf, buflen, "%s/%d", getname6((u_char *)&addr), plen);
610 return 1 + (plen + 7) / 8;
611 }
612
613 static int
614 decode_labeled_prefix6(const u_char *pptr, char *buf, u_int buflen)
615 {
616 struct in6_addr addr;
617 u_int plen;
618
619 plen = pptr[0]; /* get prefix length */
620 plen-=24; /* adjust prefixlen - labellength */
621
622 if (128 < plen)
623 return -1;
624
625 memset(&addr, 0, sizeof(addr));
626 memcpy(&addr, &pptr[4], (plen + 7) / 8);
627 if (plen % 8) {
628 addr.s6_addr[(plen + 7) / 8 - 1] &=
629 ((0xff00 >> (plen % 8)) & 0xff);
630 }
631 /* the label may get offsetted by 4 bits so lets shift it right */
632 snprintf(buf, buflen, "%s/%d, label:%u %s",
633 getname6((u_char *)&addr),
634 plen,
635 EXTRACT_24BITS(pptr+1)>>4,
636 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
637
638 return 4 + (plen + 7) / 8;
639 }
640
641 static int
642 decode_labeled_vpn_prefix6(const u_char *pptr, char *buf, u_int buflen)
643 {
644 struct in6_addr addr;
645 u_int plen;
646
647 plen = pptr[0]; /* get prefix length */
648
649 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
650
651 if (128 < plen)
652 return -1;
653
654 memset(&addr, 0, sizeof(addr));
655 memcpy(&addr, &pptr[12], (plen + 7) / 8);
656 if (plen % 8) {
657 addr.s6_addr[(plen + 7) / 8 - 1] &=
658 ((0xff00 >> (plen % 8)) & 0xff);
659 }
660 /* the label may get offsetted by 4 bits so lets shift it right */
661 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
662 bgp_vpn_rd_print(pptr+4),
663 getname6((u_char *)&addr),
664 plen,
665 EXTRACT_24BITS(pptr+1)>>4,
666 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
667
668 return 12 + (plen + 7) / 8;
669 }
670 #endif
671
672 static void
673 bgp_attr_print(const struct bgp_attr *attr, const u_char *pptr, int len)
674 {
675 int i;
676 u_int16_t af;
677 u_int8_t safi, snpa;
678 union { /* copy buffer for bandwidth values */
679 float f;
680 u_int32_t i;
681 } bw;
682 int advance;
683 int tlen;
684 const u_char *tptr;
685 char buf[MAXHOSTNAMELEN + 100];
686
687 tptr = pptr;
688 tlen=len;
689
690 switch (attr->bgpa_type) {
691 case BGPTYPE_ORIGIN:
692 if (len != 1)
693 printf("invalid len");
694 else
695 printf("%s", tok2str(bgp_origin_values, "Unknown Origin Typecode", tptr[0]));
696 break;
697 case BGPTYPE_AS_PATH:
698 if (len % 2) {
699 printf("invalid len");
700 break;
701 }
702 if (!len) {
703 printf("empty");
704 break;
705 }
706 while (tptr < pptr + len) {
707 /*
708 * under RFC1965, p[0] means:
709 * 1: AS_SET 2: AS_SEQUENCE
710 * 3: AS_CONFED_SET 4: AS_CONFED_SEQUENCE
711 */
712 if (tptr[0] == 3 || tptr[0] == 4)
713 printf("confed");
714 printf("%s", (tptr[0] & 1) ? "{" : "");
715 for (i = 0; i < tptr[1] * 2; i += 2) {
716 printf("%s%u", i == 0 ? "" : " ",
717 EXTRACT_16BITS(&tptr[2 + i]));
718 }
719 printf("%s", (tptr[0] & 1) ? "}" : "");
720 tptr += 2 + tptr[1] * 2;
721 }
722 break;
723 case BGPTYPE_NEXT_HOP:
724 if (len != 4)
725 printf("invalid len");
726 else
727 printf("%s", getname(tptr));
728 break;
729 case BGPTYPE_MULTI_EXIT_DISC:
730 case BGPTYPE_LOCAL_PREF:
731 if (len != 4)
732 printf("invalid len");
733 else
734 printf("%u", EXTRACT_32BITS(tptr));
735 break;
736 case BGPTYPE_ATOMIC_AGGREGATE:
737 if (len != 0)
738 printf("invalid len");
739 break;
740 case BGPTYPE_AGGREGATOR:
741 if (len != 6) {
742 printf("invalid len");
743 break;
744 }
745 printf(" AS #%u, origin %s", EXTRACT_16BITS(tptr),
746 getname(tptr + 2));
747 break;
748 case BGPTYPE_COMMUNITIES:
749 if (len % 4) {
750 printf("invalid len");
751 break;
752 }
753 while (tlen>0) {
754 u_int32_t comm;
755 comm = EXTRACT_32BITS(tptr);
756 switch (comm) {
757 case BGP_COMMUNITY_NO_EXPORT:
758 printf(" NO_EXPORT");
759 break;
760 case BGP_COMMUNITY_NO_ADVERT:
761 printf(" NO_ADVERTISE");
762 break;
763 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
764 printf(" NO_EXPORT_SUBCONFED");
765 break;
766 default:
767 printf("%u:%u%s",
768 (comm >> 16) & 0xffff,
769 comm & 0xffff,
770 (tlen>4) ? ", " : "");
771 break;
772 }
773 tlen -=4;
774 tptr +=4;
775 }
776 break;
777 case BGPTYPE_ORIGINATOR_ID:
778 if (len != 4) {
779 printf("invalid len");
780 break;
781 }
782 printf("%s",getname(tptr));
783 break;
784 case BGPTYPE_CLUSTER_LIST:
785 while (tlen>0) {
786 printf("%s%s",
787 getname(tptr),
788 (tlen>4) ? ", " : "");
789 tlen -=4;
790 tptr +=4;
791 }
792 break;
793 case BGPTYPE_MP_REACH_NLRI:
794 af = EXTRACT_16BITS(tptr);
795 safi = tptr[2];
796
797 printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
798 tok2str(bgp_afi_values, "Unknown AFI", af),
799 af,
800 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
801 tok2str(bgp_safi_values, "Unknown SAFI", safi),
802 safi);
803
804 if (af == AFNUM_INET || af==AFNUM_L2VPN)
805 ;
806 #ifdef INET6
807 else if (af == AFNUM_INET6)
808 ;
809 #endif
810 else {
811 printf("\n\t no AFI %u decoder",af);
812 if (vflag <= 1)
813 print_unknown_data(tptr,"\n\t ",tlen);
814 break;
815 }
816
817 tptr +=3;
818
819 tlen = tptr[0];
820 tptr++;
821
822 if (tlen) {
823 printf("\n\t nexthop: ");
824 while (tlen > 0) {
825 switch (af) {
826 case AFNUM_INET:
827 switch(safi) {
828 case SAFNUM_UNICAST:
829 case SAFNUM_MULTICAST:
830 case SAFNUM_UNIMULTICAST:
831 case SAFNUM_LABUNICAST:
832 printf("%s",getname(tptr));
833 tlen -= sizeof(struct in_addr);
834 tptr += sizeof(struct in_addr);
835 break;
836 case SAFNUM_VPNUNICAST:
837 case SAFNUM_VPNMULTICAST:
838 case SAFNUM_VPNUNIMULTICAST:
839 printf("RD: %s, %s",
840 bgp_vpn_rd_print(tptr),
841 getname(tptr+BGP_VPN_RD_LEN));
842 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
843 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
844 break;
845 default:
846 printf("no SAFI %u decoder",safi);
847 if (vflag <= 1)
848 print_unknown_data(tptr,"\n\t ",tlen);
849 break;
850 }
851 break;
852 #ifdef INET6
853 case AFNUM_INET6:
854 switch(safi) {
855 case SAFNUM_UNICAST:
856 case SAFNUM_MULTICAST:
857 case SAFNUM_UNIMULTICAST:
858 case SAFNUM_LABUNICAST:
859 printf("%s", getname6(tptr));
860 tlen -= sizeof(struct in6_addr);
861 tptr += sizeof(struct in6_addr);
862 break;
863 case SAFNUM_VPNUNICAST:
864 case SAFNUM_VPNMULTICAST:
865 case SAFNUM_VPNUNIMULTICAST:
866 printf("RD: %s, %s",
867 bgp_vpn_rd_print(tptr),
868 getname6(tptr+BGP_VPN_RD_LEN));
869 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
870 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
871 break;
872 default:
873 printf("no SAFI %u decoder",safi);
874 if (vflag <= 1)
875 print_unknown_data(tptr,"\n\t ",tlen);
876 break;
877 }
878 break;
879 #endif
880 case AFNUM_L2VPN:
881 switch(safi) {
882 case SAFNUM_VPNUNICAST:
883 case SAFNUM_VPNMULTICAST:
884 case SAFNUM_VPNUNIMULTICAST:
885 printf("%s", getname(tptr));
886 tlen -= (sizeof(struct in_addr));
887 tptr += (sizeof(struct in_addr));
888 break;
889 default:
890 printf("no SAFI %u decoder",safi);
891 if (vflag <= 1)
892 print_unknown_data(tptr,"\n\t ",tlen);
893 break;
894 }
895 break;
896
897 default:
898 printf("no AFI %u decoder",af);
899 if (vflag <= 1)
900 print_unknown_data(tptr,"\n\t ",tlen);
901 break;
902 }
903 }
904 }
905 tptr += tlen;
906
907 snpa = tptr[0];
908 tptr++;
909
910 if (snpa) {
911 printf("\n\t %u SNPA", snpa);
912 for (/*nothing*/; snpa > 0; snpa--) {
913 printf("\n\t %d bytes", tptr[0]);
914 tptr += tptr[0] + 1;
915 }
916 } else {
917 printf(", no SNPA");
918 }
919
920 while (len - (tptr - pptr) > 0) {
921 switch (af) {
922 case AFNUM_INET:
923 switch (safi) {
924 case SAFNUM_UNICAST:
925 case SAFNUM_MULTICAST:
926 case SAFNUM_UNIMULTICAST:
927 advance = decode_prefix4(tptr, buf, sizeof(buf));
928 if (advance >= 0)
929 printf("\n\t %s", buf);
930 else
931 printf("\n\t (illegal prefix length)");
932 break;
933 case SAFNUM_LABUNICAST:
934 advance = decode_labeled_prefix4(tptr, buf, sizeof(buf));
935 printf("\n\t %s", buf);
936 break;
937 case SAFNUM_VPNUNICAST:
938 case SAFNUM_VPNMULTICAST:
939 case SAFNUM_VPNUNIMULTICAST:
940 advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf));
941 printf("\n\t %s", buf);
942 break;
943 default:
944 printf("\n\t no SAFI %u decoder",safi);
945 if (vflag <= 1)
946 print_unknown_data(tptr-3,"\n\t ",tlen);
947 advance = 0;
948 tptr = pptr + len;
949 break;
950 }
951 break;
952 #ifdef INET6
953 case AFNUM_INET6:
954 switch (safi) {
955 case SAFNUM_UNICAST:
956 case SAFNUM_MULTICAST:
957 case SAFNUM_UNIMULTICAST:
958 advance = decode_prefix6(tptr, buf, sizeof(buf));
959 printf("\n\t %s", buf);
960 break;
961 case SAFNUM_LABUNICAST:
962 advance = decode_labeled_prefix6(tptr, buf, sizeof(buf));
963 printf("\n\t %s", buf);
964 break;
965 case SAFNUM_VPNUNICAST:
966 case SAFNUM_VPNMULTICAST:
967 case SAFNUM_VPNUNIMULTICAST:
968 advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf));
969 printf("\n\t %s", buf);
970 break;
971 default:
972 printf("\n\t no SAFI %u decoder ",safi);
973 if (vflag <= 1)
974 print_unknown_data(tptr-3,"\n\t ",tlen);
975 advance = 0;
976 tptr = pptr + len;
977 break;
978 }
979 break;
980 #endif
981 case AFNUM_L2VPN:
982 switch(safi) {
983 case SAFNUM_VPNUNICAST:
984 case SAFNUM_VPNMULTICAST:
985 case SAFNUM_VPNUNIMULTICAST:
986 advance = decode_labeled_vpn_l2(tptr, buf, sizeof(buf));
987 printf("\n\t %s", buf);
988 break;
989 default:
990 printf("no SAFI %u decoder",safi);
991 if (vflag <= 1)
992 print_unknown_data(tptr,"\n\t ",tlen);
993 advance = 0;
994 tptr = pptr + len;
995 break;
996 }
997 break;
998
999
1000 default:
1001 printf("\n\t no AFI %u decoder ",af);
1002 if (vflag <= 1)
1003 print_unknown_data(tptr-3,"\n\t ",tlen);
1004 advance = 0;
1005 tptr = pptr + len;
1006 break;
1007 }
1008 tptr += advance;
1009 }
1010 break;
1011
1012 case BGPTYPE_MP_UNREACH_NLRI:
1013 af = EXTRACT_16BITS(tptr);
1014 safi = tptr[2];
1015
1016 printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
1017 tok2str(bgp_afi_values, "Unknown AFI", af),
1018 af,
1019 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1020 tok2str(bgp_safi_values, "Unknown SAFI", safi),
1021 safi);
1022
1023 tptr += 3;
1024
1025 while (len - (tptr - pptr) > 0) {
1026 switch (af) {
1027 case AFNUM_INET:
1028 switch (safi) {
1029 case SAFNUM_UNICAST:
1030 case SAFNUM_MULTICAST:
1031 case SAFNUM_UNIMULTICAST:
1032 advance = decode_prefix4(tptr, buf, sizeof(buf));
1033 if (advance >= 0)
1034 printf("\n\t %s", buf);
1035 else
1036 printf("\n\t (illegal prefix length)");
1037 break;
1038 case SAFNUM_LABUNICAST:
1039 advance = decode_labeled_prefix4(tptr, buf, sizeof(buf));
1040 printf("\n\t %s", buf);
1041 break;
1042 case SAFNUM_VPNUNICAST:
1043 case SAFNUM_VPNMULTICAST:
1044 case SAFNUM_VPNUNIMULTICAST:
1045 advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf));
1046 printf("\n\t %s", buf);
1047 break;
1048 default:
1049 printf("\n\t no SAFI %u decoder",safi);
1050 if (vflag <= 1)
1051 print_unknown_data(tptr-3,"\n\t ",tlen);
1052 advance = 0;
1053 tptr = pptr + len;
1054 break;
1055 }
1056 break;
1057
1058 #ifdef INET6
1059 case AFNUM_INET6:
1060 switch (safi) {
1061 case SAFNUM_UNICAST:
1062 case SAFNUM_MULTICAST:
1063 case SAFNUM_UNIMULTICAST:
1064 advance = decode_prefix6(tptr, buf, sizeof(buf));
1065 printf("\n\t %s", buf);
1066 break;
1067 case SAFNUM_LABUNICAST:
1068 advance = decode_labeled_prefix6(tptr, buf, sizeof(buf));
1069 printf("\n\t %s", buf);
1070 break;
1071 case SAFNUM_VPNUNICAST:
1072 case SAFNUM_VPNMULTICAST:
1073 case SAFNUM_VPNUNIMULTICAST:
1074 advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf));
1075 printf("\n\t %s", buf);
1076 break;
1077 default:
1078 printf("\n\t no SAFI %u decoder",safi);
1079 if (vflag <= 1)
1080 print_unknown_data(tptr-3,"\n\t ",tlen);
1081 advance = 0;
1082 tptr = pptr + len;
1083 break;
1084 }
1085 break;
1086 #endif
1087
1088 case AFNUM_L2VPN:
1089 switch(safi) {
1090 case SAFNUM_VPNUNICAST:
1091 case SAFNUM_VPNMULTICAST:
1092 case SAFNUM_VPNUNIMULTICAST:
1093 advance = decode_labeled_vpn_l2(tptr, buf, sizeof(buf));
1094 printf("\n\t %s", buf);
1095 break;
1096 default:
1097 printf("no SAFI %u decoder",safi);
1098 if (vflag <= 1)
1099 print_unknown_data(tptr-3,"\n\t ",tlen);
1100 advance = 0;
1101 tptr = pptr + len;
1102 break;
1103 }
1104 break;
1105
1106 default:
1107 printf("\n\t no AFI %u decoder",af);
1108 if (vflag <= 1)
1109 print_unknown_data(tptr-3,"\n\t ",tlen);
1110 advance = 0;
1111 tptr = pptr + len;
1112 break;
1113 }
1114
1115 tptr += advance;
1116 }
1117 break;
1118 case BGPTYPE_EXTD_COMMUNITIES:
1119 if (len % 8) {
1120 printf("invalid len");
1121 break;
1122 }
1123 while (tlen>0) {
1124 u_int16_t extd_comm;
1125 extd_comm=EXTRACT_16BITS(tptr);
1126
1127 printf("\n\t %s (0x%04x), Flags [%s]",
1128 tok2str(bgp_extd_comm_subtype_values, "unknown extd community typecode", extd_comm),
1129 extd_comm,
1130 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm));
1131
1132 switch(extd_comm) {
1133 case BGP_EXT_COM_RT_0:
1134 case BGP_EXT_COM_RO_0:
1135 printf(": %u:%s",
1136 EXTRACT_16BITS(tptr+2),
1137 getname(tptr+4));
1138 break;
1139 case BGP_EXT_COM_RT_1:
1140 case BGP_EXT_COM_RO_1:
1141 printf(": %s:%u",
1142 getname(tptr+2),
1143 EXTRACT_16BITS(tptr+6));
1144 break;
1145 case BGP_EXT_COM_RT_2:
1146 case BGP_EXT_COM_RO_2:
1147 printf(": %u:%u",
1148 EXTRACT_32BITS(tptr+2),
1149 EXTRACT_16BITS(tptr+6));
1150 break;
1151 case BGP_EXT_COM_LINKBAND:
1152 bw.i = EXTRACT_32BITS(tptr+2);
1153 printf(": bandwidth: %.3f Mbps",
1154 bw.f*8/1000000);
1155 break;
1156 case BGP_EXT_COM_VPN_ORIGIN:
1157 case BGP_EXT_COM_VPN_ORIGIN2:
1158 case BGP_EXT_COM_VPN_ORIGIN3:
1159 case BGP_EXT_COM_VPN_ORIGIN4:
1160 case BGP_EXT_COM_OSPF_RID:
1161 case BGP_EXT_COM_OSPF_RID2:
1162 printf("%s", getname(tptr+2));
1163 break;
1164 case BGP_EXT_COM_OSPF_RTYPE:
1165 case BGP_EXT_COM_OSPF_RTYPE2:
1166 printf(": area:%s, router-type:%s, metric-type:%s%s",
1167 getname(tptr+2),
1168 tok2str(bgp_extd_comm_ospf_rtype_values,
1169 "unknown (0x%02x)",
1170 *(tptr+6)),
1171 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
1172 (*(tptr+6) == (BGP_OSPF_RTYPE_EXT ||BGP_OSPF_RTYPE_NSSA )) ? "E1" : "");
1173 break;
1174 case BGP_EXT_COM_L2INFO:
1175 printf(": %s Control Flags [0x%02x]:MTU %u",
1176 tok2str(bgp_l2vpn_encaps_values,
1177 "unknown encaps",
1178 *(tptr+2)),
1179 *(tptr+3),
1180 EXTRACT_16BITS(tptr+4));
1181 break;
1182 default:
1183 print_unknown_data(tptr,"\n\t ",8);
1184 break;
1185 }
1186 tlen -=8;
1187 tptr +=8;
1188 }
1189 break;
1190
1191 default:
1192 printf("\n\t no Attribute %u decoder",attr->bgpa_type); /* we have no decoder for the attribute */
1193 if (vflag <= 1)
1194 print_unknown_data(pptr,"\n\t ",len);
1195 break;
1196 }
1197 if (vflag > 1 && len) /* omit zero length attributes*/
1198 print_unknown_data(pptr,"\n\t ",len);
1199 }
1200
1201 static void
1202 bgp_open_print(const u_char *dat, int length)
1203 {
1204 struct bgp_open bgpo;
1205 struct bgp_opt bgpopt;
1206 int hlen;
1207 const u_char *opt;
1208 int i,cap_type,cap_len,tcap_len,cap_offset;
1209
1210 TCHECK2(dat[0], BGP_OPEN_SIZE);
1211 memcpy(&bgpo, dat, BGP_OPEN_SIZE);
1212 hlen = ntohs(bgpo.bgpo_len);
1213
1214 printf("\n\t Version %d, ", bgpo.bgpo_version);
1215 printf("my AS %u, ", ntohs(bgpo.bgpo_myas));
1216 printf("Holdtime %us, ", ntohs(bgpo.bgpo_holdtime));
1217 printf("ID %s", getname((u_char *)&bgpo.bgpo_id));
1218 printf("\n\t Optional parameters, length: %u", bgpo.bgpo_optlen);
1219
1220 /* some little sanity checking */
1221 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE)
1222 return;
1223
1224 /* ugly! */
1225 opt = &((const struct bgp_open *)dat)->bgpo_optlen;
1226 opt++;
1227
1228 i = 0;
1229 while (i < bgpo.bgpo_optlen) {
1230 TCHECK2(opt[i], BGP_OPT_SIZE);
1231 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE);
1232 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
1233 printf("\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len);
1234 break;
1235 }
1236
1237 printf("\n\t Option %s (%u), length: %u",
1238 tok2str(bgp_opt_values,"Unknown", bgpopt.bgpopt_type),
1239 bgpopt.bgpopt_type,
1240 bgpopt.bgpopt_len);
1241
1242 /* now lets decode the options we know*/
1243 switch(bgpopt.bgpopt_type) {
1244 case BGP_OPT_CAP:
1245 cap_type=opt[i+BGP_OPT_SIZE];
1246 cap_len=opt[i+BGP_OPT_SIZE+1];
1247 tcap_len=cap_len;
1248 printf("\n\t %s, length: %u",
1249 tok2str(bgp_capcode_values,"Unknown", cap_type),
1250 cap_len);
1251 switch(cap_type) {
1252 case BGP_CAPCODE_MP:
1253 printf("\n\t\tAFI %s (%u), SAFI %s (%u)",
1254 tok2str(bgp_afi_values,"Unknown", EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2)),
1255 EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2),
1256 tok2str(bgp_safi_values,"Unknown", opt[i+BGP_OPT_SIZE+5]),
1257 opt[i+BGP_OPT_SIZE+5]);
1258 break;
1259 case BGP_CAPCODE_RESTART:
1260 printf("\n\t\tRestart Flags: [%s], Restart Time %us",
1261 ((opt[i+BGP_OPT_SIZE+2])&0x80) ? "R" : "none",
1262 EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2)&0xfff);
1263 tcap_len-=2;
1264 cap_offset=4;
1265 while(tcap_len>=4) {
1266 printf("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
1267 tok2str(bgp_afi_values,"Unknown", EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+cap_offset)),
1268 EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+cap_offset),
1269 tok2str(bgp_safi_values,"Unknown", opt[i+BGP_OPT_SIZE+cap_offset+2]),
1270 opt[i+BGP_OPT_SIZE+cap_offset+2],
1271 ((opt[i+BGP_OPT_SIZE+cap_offset+3])&0x80) ? "yes" : "no" );
1272 tcap_len-=4;
1273 cap_offset+=4;
1274 }
1275 break;
1276 case BGP_CAPCODE_RR:
1277 case BGP_CAPCODE_RR_CISCO:
1278 break;
1279 default:
1280 printf("\n\t\tno decoder for Capability %u",
1281 cap_type);
1282 if (vflag <= 1)
1283 print_unknown_data(&opt[i+BGP_OPT_SIZE+2],"\n\t\t",cap_len);
1284 break;
1285 }
1286 if (vflag > 1)
1287 print_unknown_data(&opt[i+BGP_OPT_SIZE+2],"\n\t\t",cap_len);
1288 break;
1289 case BGP_OPT_AUTH:
1290 default:
1291 printf("\n\t no decoder for option %u",
1292 bgpopt.bgpopt_type);
1293 break;
1294 }
1295
1296 i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
1297 }
1298 return;
1299 trunc:
1300 printf("[|BGP]");
1301 }
1302
1303 static void
1304 bgp_update_print(const u_char *dat, int length)
1305 {
1306 struct bgp bgp;
1307 struct bgp_attr bgpa;
1308 int hlen;
1309 const u_char *p;
1310 int len;
1311 int i;
1312
1313 TCHECK2(dat[0], BGP_SIZE);
1314 memcpy(&bgp, dat, BGP_SIZE);
1315 hlen = ntohs(bgp.bgp_len);
1316 p = dat + BGP_SIZE; /*XXX*/
1317
1318 /* Unfeasible routes */
1319 len = EXTRACT_16BITS(p);
1320 if (len) {
1321 /*
1322 * Without keeping state from the original NLRI message,
1323 * it's not possible to tell if this a v4 or v6 route,
1324 * so only try to decode it if we're not v6 enabled.
1325 */
1326 #ifdef INET6
1327 printf("\n\t Withdrawn routes: %d bytes", len);
1328 #else
1329 char buf[MAXHOSTNAMELEN + 100];
1330 int wpfx;
1331
1332 TCHECK2(p[2], len);
1333 i = 2;
1334
1335 printf("\n\t Withdrawn routes:");
1336
1337 while(i < 2 + len) {
1338 wpfx = decode_prefix4(&p[i], buf, sizeof(buf));
1339 if (wpfx >= 0) {
1340 i += wpfx;
1341 printf("\n\t %s", buf);
1342 } else {
1343 printf("\n\t (illegal prefix length)");
1344 break;
1345 }
1346 }
1347 #endif
1348 }
1349 p += 2 + len;
1350
1351 TCHECK2(p[0], 2);
1352 len = EXTRACT_16BITS(p);
1353 if (len) {
1354 /* do something more useful!*/
1355 i = 2;
1356 while (i < 2 + len) {
1357 int alen, aoff;
1358
1359 TCHECK2(p[i], sizeof(bgpa));
1360 memcpy(&bgpa, &p[i], sizeof(bgpa));
1361 alen = bgp_attr_len(&bgpa);
1362 aoff = bgp_attr_off(&bgpa);
1363
1364 printf("\n\t %s (%u), length: %u",
1365 tok2str(bgp_attr_values, "Unknown Attribute", bgpa.bgpa_type),
1366 bgpa.bgpa_type,
1367 alen);
1368
1369 if (bgpa.bgpa_flags) {
1370 printf(", Flags [%s%s%s%s",
1371 bgpa.bgpa_flags & 0x80 ? "O" : "",
1372 bgpa.bgpa_flags & 0x40 ? "T" : "",
1373 bgpa.bgpa_flags & 0x20 ? "P" : "",
1374 bgpa.bgpa_flags & 0x10 ? "E" : "");
1375 if (bgpa.bgpa_flags & 0xf)
1376 printf("+%x", bgpa.bgpa_flags & 0xf);
1377 printf("]: ");
1378 }
1379 bgp_attr_print(&bgpa, &p[i + aoff], alen);
1380 i += aoff + alen;
1381 }
1382 }
1383 p += 2 + len;
1384
1385 if (dat + length > p) {
1386 printf("\n\t Updated routes:");
1387 while (dat + length > p) {
1388 char buf[MAXHOSTNAMELEN + 100];
1389 i = decode_prefix4(p, buf, sizeof(buf));
1390 if (i >= 0) {
1391 printf("\n\t %s", buf);
1392 p += i;
1393 } else {
1394 printf("\n\t (illegal prefix length)");
1395 break;
1396 }
1397 }
1398 }
1399 return;
1400 trunc:
1401 printf("[|BGP]");
1402 }
1403
1404 static void
1405 bgp_notification_print(const u_char *dat, int length)
1406 {
1407 struct bgp_notification bgpn;
1408 int hlen;
1409 const u_char *tptr;
1410
1411 TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
1412 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
1413 hlen = ntohs(bgpn.bgpn_len);
1414
1415 /* some little sanity checking */
1416 if (length<BGP_NOTIFICATION_SIZE)
1417 return;
1418
1419 printf(", %s (%u)",
1420 tok2str(bgp_notify_major_values, "Unknown Error", bgpn.bgpn_major),
1421 bgpn.bgpn_major);
1422
1423 switch (bgpn.bgpn_major) {
1424
1425 case BGP_NOTIFY_MAJOR_MSG:
1426 printf(", subcode %s (%u)",
1427 tok2str(bgp_notify_minor_msg_values, "Unknown", bgpn.bgpn_minor),
1428 bgpn.bgpn_minor);
1429 break;
1430 case BGP_NOTIFY_MAJOR_OPEN:
1431 printf(", subcode %s (%u)",
1432 tok2str(bgp_notify_minor_open_values, "Unknown", bgpn.bgpn_minor),
1433 bgpn.bgpn_minor);
1434 break;
1435 case BGP_NOTIFY_MAJOR_UPDATE:
1436 printf(", subcode %s (%u)",
1437 tok2str(bgp_notify_minor_update_values, "Unknown", bgpn.bgpn_minor),
1438 bgpn.bgpn_minor);
1439 break;
1440 case BGP_NOTIFY_MAJOR_CAP:
1441 printf(" subcode %s (%u)",
1442 tok2str(bgp_notify_minor_cap_values, "Unknown", bgpn.bgpn_minor),
1443 bgpn.bgpn_minor);
1444 case BGP_NOTIFY_MAJOR_CEASE:
1445 printf(", subcode %s (%u)",
1446 tok2str(bgp_notify_minor_cease_values, "Unknown", bgpn.bgpn_minor),
1447 bgpn.bgpn_minor);
1448
1449 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
1450 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
1451 */
1452 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
1453 tptr = dat + BGP_NOTIFICATION_SIZE;
1454 TCHECK2(*tptr, 7);
1455 printf(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
1456 tok2str(bgp_afi_values, "Unknown", EXTRACT_16BITS(tptr)),
1457 EXTRACT_16BITS(tptr),
1458 tok2str(bgp_safi_values, "Unknown", *(tptr+2)),
1459 *(tptr+2),
1460 EXTRACT_32BITS(tptr+3));
1461 }
1462 break;
1463 default:
1464 break;
1465 }
1466
1467 return;
1468 trunc:
1469 printf("[|BGP]");
1470 }
1471
1472 static void
1473 bgp_route_refresh_print(const u_char *pptr, int len) {
1474
1475 const struct bgp_route_refresh *bgp_route_refresh_header;
1476 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
1477
1478 printf("\n\t AFI %s (%u), SAFI %s (%u)",
1479 tok2str(bgp_afi_values,"Unknown",
1480 EXTRACT_16BITS(&bgp_route_refresh_header->afi)), /* this stinks but the compiler pads the structure weird */
1481 EXTRACT_16BITS(&bgp_route_refresh_header->afi),
1482 tok2str(bgp_safi_values,"Unknown",
1483 bgp_route_refresh_header->safi),
1484 bgp_route_refresh_header->safi);
1485
1486 if (vflag > 1)
1487 print_unknown_data(pptr,"\n\t ", len);
1488
1489 return;
1490 }
1491
1492 static void
1493 bgp_header_print(const u_char *dat, int length)
1494 {
1495 struct bgp bgp;
1496
1497 TCHECK2(dat[0], BGP_SIZE);
1498 memcpy(&bgp, dat, BGP_SIZE);
1499 printf("\n\t%s Message (%u), length: %u",
1500 tok2str(bgp_msg_values, "Unknown", bgp.bgp_type),
1501 bgp.bgp_type,
1502 length);
1503
1504 switch (bgp.bgp_type) {
1505 case BGP_OPEN:
1506 bgp_open_print(dat, length);
1507 break;
1508 case BGP_UPDATE:
1509 bgp_update_print(dat, length);
1510 break;
1511 case BGP_NOTIFICATION:
1512 bgp_notification_print(dat, length);
1513 break;
1514 case BGP_KEEPALIVE:
1515 break;
1516 case BGP_ROUTE_REFRESH:
1517 bgp_route_refresh_print(dat, length);
1518 break;
1519 default:
1520 /* we have no decoder for the BGP message */
1521 printf("\n\t no Message %u decoder",bgp.bgp_type);
1522 print_unknown_data(dat,"\n\t ",length);
1523 break;
1524 }
1525 return;
1526 trunc:
1527 printf("[|BGP]");
1528 }
1529
1530 void
1531 bgp_print(const u_char *dat, int length)
1532 {
1533 const u_char *p;
1534 const u_char *ep;
1535 const u_char *start;
1536 const u_char marker[] = {
1537 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
1538 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
1539 };
1540 struct bgp bgp;
1541 u_int16_t hlen;
1542
1543 ep = dat + length;
1544 if (snapend < dat + length)
1545 ep = snapend;
1546
1547 printf(": BGP, length: %u",length);
1548
1549 if (vflag < 1) /* lets be less chatty */
1550 return;
1551
1552 p = dat;
1553 start = p;
1554 while (p < snapend) {
1555 if (!TTEST2(p[0], 1))
1556 break;
1557 if (p[0] != 0xff) {
1558 p++;
1559 continue;
1560 }
1561
1562 if (!TTEST2(p[0], sizeof(marker)))
1563 break;
1564 if (memcmp(p, marker, sizeof(marker)) != 0) {
1565 p++;
1566 continue;
1567 }
1568
1569 /* found BGP header */
1570 TCHECK2(p[0], BGP_SIZE); /*XXX*/
1571 memcpy(&bgp, p, BGP_SIZE);
1572
1573 if (start != p)
1574 printf(" [|BGP]");
1575
1576 hlen = ntohs(bgp.bgp_len);
1577 if (hlen < BGP_SIZE) {
1578 printf("\n[|BGP Bogus header length %u < %u]", hlen,
1579 BGP_SIZE);
1580 break;
1581 }
1582
1583 if (TTEST2(p[0], hlen)) {
1584 bgp_header_print(p, hlen);
1585 p += hlen;
1586 start = p;
1587 } else {
1588 printf("\n[|BGP %s]", tok2str(bgp_msg_values, "Unknown Message Type",bgp.bgp_type));
1589 break;
1590 }
1591 }
1592
1593 return;
1594
1595 trunc:
1596 printf(" [|BGP]");
1597 }
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