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c8cf0f94 PA |
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 | * | |
411677ae | 29 | * Extensively modified by Hannes Gredler (hannes@gredler.at) for more |
c8cf0f94 PA |
30 | * complete BGP support. |
31 | */ | |
32 | ||
411677ae AL |
33 | /* \summary: Border Gateway Protocol (BGP) printer */ |
34 | ||
ed775ee7 AHJ |
35 | /* specification: RFC 4271 */ |
36 | ||
c8cf0f94 | 37 | #ifdef HAVE_CONFIG_H |
ed775ee7 | 38 | #include <config.h> |
c8cf0f94 PA |
39 | #endif |
40 | ||
ed775ee7 | 41 | #include "netdissect-stdinc.h" |
c8cf0f94 PA |
42 | |
43 | #include <stdio.h> | |
44 | #include <string.h> | |
45 | ||
411677ae | 46 | #include "netdissect.h" |
c8cf0f94 PA |
47 | #include "addrtoname.h" |
48 | #include "extract.h" | |
66170f0a | 49 | #include "af.h" |
ea7b4bf5 | 50 | #include "l2vpn.h" |
c8cf0f94 PA |
51 | |
52 | struct bgp { | |
ed775ee7 AHJ |
53 | nd_byte bgp_marker[16]; |
54 | nd_uint16_t bgp_len; | |
55 | nd_uint8_t bgp_type; | |
c8cf0f94 | 56 | }; |
ed775ee7 | 57 | #define BGP_SIZE 19 /* unaligned */ |
c8cf0f94 | 58 | |
ed775ee7 AHJ |
59 | #define BGP_OPEN 1 |
60 | #define BGP_UPDATE 2 | |
61 | #define BGP_NOTIFICATION 3 | |
62 | #define BGP_KEEPALIVE 4 | |
c8cf0f94 PA |
63 | #define BGP_ROUTE_REFRESH 5 |
64 | ||
411677ae | 65 | static const struct tok bgp_msg_values[] = { |
c8cf0f94 PA |
66 | { BGP_OPEN, "Open"}, |
67 | { BGP_UPDATE, "Update"}, | |
68 | { BGP_NOTIFICATION, "Notification"}, | |
69 | { BGP_KEEPALIVE, "Keepalive"}, | |
70 | { BGP_ROUTE_REFRESH, "Route Refresh"}, | |
71 | { 0, NULL} | |
72 | }; | |
73 | ||
74 | struct bgp_open { | |
ed775ee7 AHJ |
75 | nd_byte bgpo_marker[16]; |
76 | nd_uint16_t bgpo_len; | |
77 | nd_uint8_t bgpo_type; | |
78 | nd_uint8_t bgpo_version; | |
79 | nd_uint16_t bgpo_myas; | |
80 | nd_uint16_t bgpo_holdtime; | |
81 | nd_uint32_t bgpo_id; | |
82 | nd_uint8_t bgpo_optlen; | |
83 | /* options should follow */ | |
c8cf0f94 | 84 | }; |
ed775ee7 | 85 | #define BGP_OPEN_SIZE 29 /* unaligned */ |
c8cf0f94 PA |
86 | |
87 | struct bgp_opt { | |
ed775ee7 AHJ |
88 | nd_uint8_t bgpopt_type; |
89 | nd_uint8_t bgpopt_len; | |
90 | /* variable length */ | |
c8cf0f94 | 91 | }; |
ed775ee7 AHJ |
92 | #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */ |
93 | #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */ | |
c8cf0f94 PA |
94 | |
95 | struct bgp_notification { | |
ed775ee7 AHJ |
96 | nd_byte bgpn_marker[16]; |
97 | nd_uint16_t bgpn_len; | |
98 | nd_uint8_t bgpn_type; | |
99 | nd_uint8_t bgpn_major; | |
100 | nd_uint8_t bgpn_minor; | |
c8cf0f94 | 101 | }; |
ed775ee7 | 102 | #define BGP_NOTIFICATION_SIZE 21 /* unaligned */ |
c8cf0f94 PA |
103 | |
104 | struct bgp_route_refresh { | |
ed775ee7 AHJ |
105 | nd_byte bgp_marker[16]; |
106 | nd_uint16_t len; | |
107 | nd_uint8_t type; /* No padding after this; afi is, in fact, not aligned */ | |
108 | nd_uint16_t afi; | |
109 | nd_uint8_t res; | |
110 | nd_uint8_t safi; | |
111 | }; | |
c8cf0f94 PA |
112 | #define BGP_ROUTE_REFRESH_SIZE 23 |
113 | ||
6263709f | 114 | #define bgp_attr_lenlen(flags, p) \ |
ed775ee7 | 115 | (((flags) & 0x10) ? 2U : 1U) |
6263709f | 116 | #define bgp_attr_len(flags, p) \ |
ed775ee7 AHJ |
117 | (((flags) & 0x10) ? GET_BE_U_2(p) : GET_U_1(p)) |
118 | ||
119 | #define BGPTYPE_ORIGIN 1 | |
120 | #define BGPTYPE_AS_PATH 2 | |
121 | #define BGPTYPE_NEXT_HOP 3 | |
122 | #define BGPTYPE_MULTI_EXIT_DISC 4 | |
123 | #define BGPTYPE_LOCAL_PREF 5 | |
124 | #define BGPTYPE_ATOMIC_AGGREGATE 6 | |
125 | #define BGPTYPE_AGGREGATOR 7 | |
126 | #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */ | |
127 | #define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */ | |
128 | #define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */ | |
129 | #define BGPTYPE_DPA 11 /* deprecated, draft-ietf-idr-bgp-dpa */ | |
130 | #define BGPTYPE_ADVERTISERS 12 /* deprecated RFC1863 */ | |
131 | #define BGPTYPE_RCID_PATH 13 /* deprecated RFC1863 */ | |
132 | #define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */ | |
133 | #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */ | |
134 | #define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */ | |
135 | #define BGPTYPE_AS4_PATH 17 /* RFC6793 */ | |
136 | #define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */ | |
137 | #define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */ | |
138 | #define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */ | |
139 | #define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */ | |
140 | #define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */ | |
141 | #define BGPTYPE_AIGP 26 /* RFC7311 */ | |
142 | #define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */ | |
143 | #define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */ | |
144 | #define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */ | |
145 | #define BGPTYPE_ATTR_SET 128 /* RFC6368 */ | |
146 | ||
147 | #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */ | |
c8cf0f94 | 148 | |
411677ae | 149 | static const struct tok bgp_attr_values[] = { |
c8cf0f94 PA |
150 | { BGPTYPE_ORIGIN, "Origin"}, |
151 | { BGPTYPE_AS_PATH, "AS Path"}, | |
ea7b4bf5 | 152 | { BGPTYPE_AS4_PATH, "AS4 Path"}, |
c8cf0f94 PA |
153 | { BGPTYPE_NEXT_HOP, "Next Hop"}, |
154 | { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"}, | |
155 | { BGPTYPE_LOCAL_PREF, "Local Preference"}, | |
156 | { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"}, | |
157 | { BGPTYPE_AGGREGATOR, "Aggregator"}, | |
ea7b4bf5 | 158 | { BGPTYPE_AGGREGATOR4, "Aggregator4"}, |
c8cf0f94 PA |
159 | { BGPTYPE_COMMUNITIES, "Community"}, |
160 | { BGPTYPE_ORIGINATOR_ID, "Originator ID"}, | |
161 | { BGPTYPE_CLUSTER_LIST, "Cluster List"}, | |
162 | { BGPTYPE_DPA, "DPA"}, | |
163 | { BGPTYPE_ADVERTISERS, "Advertisers"}, | |
164 | { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"}, | |
165 | { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"}, | |
166 | { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"}, | |
167 | { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"}, | |
ea7b4bf5 | 168 | { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"}, |
411677ae AL |
169 | { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"}, |
170 | { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"}, | |
171 | { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"}, | |
172 | { BGPTYPE_AIGP, "Accumulated IGP Metric"}, | |
173 | { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"}, | |
174 | { BGPTYPE_ENTROPY_LABEL, "Entropy Label"}, | |
175 | { BGPTYPE_LARGE_COMMUNITY, "Large Community"}, | |
c8cf0f94 PA |
176 | { BGPTYPE_ATTR_SET, "Attribute Set"}, |
177 | { 255, "Reserved for development"}, | |
178 | { 0, NULL} | |
179 | }; | |
180 | ||
181 | #define BGP_AS_SET 1 | |
182 | #define BGP_AS_SEQUENCE 2 | |
183 | #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */ | |
184 | #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */ | |
185 | ||
ea7b4bf5 PA |
186 | #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET |
187 | #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET | |
188 | ||
411677ae | 189 | static const struct tok bgp_as_path_segment_open_values[] = { |
c8cf0f94 PA |
190 | { BGP_AS_SEQUENCE, ""}, |
191 | { BGP_AS_SET, "{ "}, | |
192 | { BGP_CONFED_AS_SEQUENCE, "( "}, | |
193 | { BGP_CONFED_AS_SET, "({ "}, | |
194 | { 0, NULL} | |
195 | }; | |
196 | ||
411677ae | 197 | static const struct tok bgp_as_path_segment_close_values[] = { |
c8cf0f94 PA |
198 | { BGP_AS_SEQUENCE, ""}, |
199 | { BGP_AS_SET, "}"}, | |
200 | { BGP_CONFED_AS_SEQUENCE, ")"}, | |
201 | { BGP_CONFED_AS_SET, "})"}, | |
202 | { 0, NULL} | |
203 | }; | |
204 | ||
205 | #define BGP_OPT_AUTH 1 | |
206 | #define BGP_OPT_CAP 2 | |
207 | ||
411677ae | 208 | static const struct tok bgp_opt_values[] = { |
c8cf0f94 PA |
209 | { BGP_OPT_AUTH, "Authentication Information"}, |
210 | { BGP_OPT_CAP, "Capabilities Advertisement"}, | |
211 | { 0, NULL} | |
212 | }; | |
213 | ||
411677ae AL |
214 | #define BGP_CAPCODE_MP 1 /* RFC2858 */ |
215 | #define BGP_CAPCODE_RR 2 /* RFC2918 */ | |
216 | #define BGP_CAPCODE_ORF 3 /* RFC5291 */ | |
217 | #define BGP_CAPCODE_MR 4 /* RFC3107 */ | |
218 | #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */ | |
ed775ee7 | 219 | #define BGP_CAPCODE_ML 8 /* RFC8277 */ |
411677ae AL |
220 | #define BGP_CAPCODE_RESTART 64 /* RFC4724 */ |
221 | #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */ | |
222 | #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */ | |
223 | #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */ | |
224 | #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */ | |
225 | #define BGP_CAPCODE_ENH_RR 70 /* draft-keyur-bgp-enhanced-route-refresh */ | |
ed775ee7 | 226 | #define BGP_CAPCODE_LLGR 71 /* draft-uttaro-idr-bgp-persistence-05 */ |
c8cf0f94 PA |
227 | #define BGP_CAPCODE_RR_CISCO 128 |
228 | ||
411677ae | 229 | static const struct tok bgp_capcode_values[] = { |
c8cf0f94 PA |
230 | { BGP_CAPCODE_MP, "Multiprotocol Extensions"}, |
231 | { BGP_CAPCODE_RR, "Route Refresh"}, | |
232 | { BGP_CAPCODE_ORF, "Cooperative Route Filtering"}, | |
411677ae AL |
233 | { BGP_CAPCODE_MR, "Multiple Routes to a Destination"}, |
234 | { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"}, | |
ed775ee7 | 235 | { BGP_CAPCODE_ML, "Multiple Labels"}, |
c8cf0f94 PA |
236 | { BGP_CAPCODE_RESTART, "Graceful Restart"}, |
237 | { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"}, | |
238 | { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"}, | |
411677ae AL |
239 | { BGP_CAPCODE_MULTISESS, "Multisession BGP"}, |
240 | { BGP_CAPCODE_ADD_PATH, "Multiple Paths"}, | |
241 | { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"}, | |
ed775ee7 | 242 | { BGP_CAPCODE_LLGR, "Long-lived Graceful Restart"}, |
c8cf0f94 PA |
243 | { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"}, |
244 | { 0, NULL} | |
245 | }; | |
246 | ||
247 | #define BGP_NOTIFY_MAJOR_MSG 1 | |
248 | #define BGP_NOTIFY_MAJOR_OPEN 2 | |
249 | #define BGP_NOTIFY_MAJOR_UPDATE 3 | |
250 | #define BGP_NOTIFY_MAJOR_HOLDTIME 4 | |
251 | #define BGP_NOTIFY_MAJOR_FSM 5 | |
252 | #define BGP_NOTIFY_MAJOR_CEASE 6 | |
253 | #define BGP_NOTIFY_MAJOR_CAP 7 | |
254 | ||
411677ae | 255 | static const struct tok bgp_notify_major_values[] = { |
c8cf0f94 PA |
256 | { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"}, |
257 | { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"}, | |
258 | { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"}, | |
259 | { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"}, | |
260 | { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"}, | |
261 | { BGP_NOTIFY_MAJOR_CEASE, "Cease"}, | |
262 | { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"}, | |
263 | { 0, NULL} | |
264 | }; | |
265 | ||
266 | /* draft-ietf-idr-cease-subcode-02 */ | |
267 | #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1 | |
ed775ee7 AHJ |
268 | /* draft-ietf-idr-shutdown-07 */ |
269 | #define BGP_NOTIFY_MINOR_CEASE_SHUT 2 | |
270 | #define BGP_NOTIFY_MINOR_CEASE_RESET 4 | |
271 | #define BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN 128 | |
411677ae | 272 | static const struct tok bgp_notify_minor_cease_values[] = { |
c8cf0f94 | 273 | { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"}, |
ed775ee7 | 274 | { BGP_NOTIFY_MINOR_CEASE_SHUT, "Administrative Shutdown"}, |
c8cf0f94 | 275 | { 3, "Peer Unconfigured"}, |
ed775ee7 | 276 | { BGP_NOTIFY_MINOR_CEASE_RESET, "Administrative Reset"}, |
c8cf0f94 PA |
277 | { 5, "Connection Rejected"}, |
278 | { 6, "Other Configuration Change"}, | |
279 | { 7, "Connection Collision Resolution"}, | |
280 | { 0, NULL} | |
281 | }; | |
282 | ||
411677ae | 283 | static const struct tok bgp_notify_minor_msg_values[] = { |
c8cf0f94 PA |
284 | { 1, "Connection Not Synchronized"}, |
285 | { 2, "Bad Message Length"}, | |
286 | { 3, "Bad Message Type"}, | |
287 | { 0, NULL} | |
288 | }; | |
289 | ||
411677ae | 290 | static const struct tok bgp_notify_minor_open_values[] = { |
c8cf0f94 PA |
291 | { 1, "Unsupported Version Number"}, |
292 | { 2, "Bad Peer AS"}, | |
293 | { 3, "Bad BGP Identifier"}, | |
294 | { 4, "Unsupported Optional Parameter"}, | |
295 | { 5, "Authentication Failure"}, | |
296 | { 6, "Unacceptable Hold Time"}, | |
ea7b4bf5 | 297 | { 7, "Capability Message Error"}, |
c8cf0f94 PA |
298 | { 0, NULL} |
299 | }; | |
300 | ||
411677ae | 301 | static const struct tok bgp_notify_minor_update_values[] = { |
c8cf0f94 PA |
302 | { 1, "Malformed Attribute List"}, |
303 | { 2, "Unrecognized Well-known Attribute"}, | |
304 | { 3, "Missing Well-known Attribute"}, | |
305 | { 4, "Attribute Flags Error"}, | |
306 | { 5, "Attribute Length Error"}, | |
307 | { 6, "Invalid ORIGIN Attribute"}, | |
308 | { 7, "AS Routing Loop"}, | |
309 | { 8, "Invalid NEXT_HOP Attribute"}, | |
310 | { 9, "Optional Attribute Error"}, | |
311 | { 10, "Invalid Network Field"}, | |
312 | { 11, "Malformed AS_PATH"}, | |
313 | { 0, NULL} | |
314 | }; | |
315 | ||
411677ae | 316 | static const struct tok bgp_notify_minor_fsm_values[] = { |
ed775ee7 | 317 | { 0, "Unspecified Error"}, |
411677ae AL |
318 | { 1, "In OpenSent State"}, |
319 | { 2, "In OpenConfirm State"}, | |
320 | { 3, "In Established State"}, | |
321 | { 0, NULL } | |
322 | }; | |
323 | ||
324 | static const struct tok bgp_notify_minor_cap_values[] = { | |
c8cf0f94 PA |
325 | { 1, "Invalid Action Value" }, |
326 | { 2, "Invalid Capability Length" }, | |
327 | { 3, "Malformed Capability Value" }, | |
328 | { 4, "Unsupported Capability Code" }, | |
329 | { 0, NULL } | |
330 | }; | |
331 | ||
411677ae | 332 | static const struct tok bgp_origin_values[] = { |
c8cf0f94 PA |
333 | { 0, "IGP"}, |
334 | { 1, "EGP"}, | |
335 | { 2, "Incomplete"}, | |
336 | { 0, NULL} | |
337 | }; | |
338 | ||
ea7b4bf5 PA |
339 | #define BGP_PMSI_TUNNEL_RSVP_P2MP 1 |
340 | #define BGP_PMSI_TUNNEL_LDP_P2MP 2 | |
341 | #define BGP_PMSI_TUNNEL_PIM_SSM 3 | |
342 | #define BGP_PMSI_TUNNEL_PIM_SM 4 | |
343 | #define BGP_PMSI_TUNNEL_PIM_BIDIR 5 | |
344 | #define BGP_PMSI_TUNNEL_INGRESS 6 | |
345 | #define BGP_PMSI_TUNNEL_LDP_MP2MP 7 | |
346 | ||
411677ae | 347 | static const struct tok bgp_pmsi_tunnel_values[] = { |
ea7b4bf5 PA |
348 | { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"}, |
349 | { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"}, | |
350 | { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"}, | |
351 | { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"}, | |
352 | { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"}, | |
353 | { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"}, | |
354 | { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"}, | |
355 | { 0, NULL} | |
356 | }; | |
357 | ||
411677ae | 358 | static const struct tok bgp_pmsi_flag_values[] = { |
ea7b4bf5 PA |
359 | { 0x01, "Leaf Information required"}, |
360 | { 0, NULL} | |
361 | }; | |
362 | ||
411677ae AL |
363 | #define BGP_AIGP_TLV 1 |
364 | ||
365 | static const struct tok bgp_aigp_values[] = { | |
366 | { BGP_AIGP_TLV, "AIGP"}, | |
367 | { 0, NULL} | |
368 | }; | |
ea7b4bf5 | 369 | |
c8cf0f94 PA |
370 | /* Subsequent address family identifier, RFC2283 section 7 */ |
371 | #define SAFNUM_RES 0 | |
372 | #define SAFNUM_UNICAST 1 | |
373 | #define SAFNUM_MULTICAST 2 | |
411677ae | 374 | #define SAFNUM_UNIMULTICAST 3 /* deprecated now */ |
c8cf0f94 PA |
375 | /* labeled BGP RFC3107 */ |
376 | #define SAFNUM_LABUNICAST 4 | |
411677ae | 377 | /* RFC6514 */ |
ea7b4bf5 | 378 | #define SAFNUM_MULTICAST_VPN 5 |
411677ae AL |
379 | /* draft-nalawade-kapoor-tunnel-safi */ |
380 | #define SAFNUM_TUNNEL 64 | |
381 | /* RFC4761 */ | |
382 | #define SAFNUM_VPLS 65 | |
383 | /* RFC6037 */ | |
27bfbee1 | 384 | #define SAFNUM_MDT 66 |
ed775ee7 AHJ |
385 | /* RFC7432 */ |
386 | #define SAFNUM_EVPN 70 | |
411677ae | 387 | /* RFC4364 */ |
c8cf0f94 | 388 | #define SAFNUM_VPNUNICAST 128 |
411677ae | 389 | /* RFC6513 */ |
c8cf0f94 | 390 | #define SAFNUM_VPNMULTICAST 129 |
411677ae AL |
391 | #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */ |
392 | /* RFC4684 */ | |
c8cf0f94 PA |
393 | #define SAFNUM_RT_ROUTING_INFO 132 |
394 | ||
395 | #define BGP_VPN_RD_LEN 8 | |
396 | ||
411677ae | 397 | static const struct tok bgp_safi_values[] = { |
c8cf0f94 PA |
398 | { SAFNUM_RES, "Reserved"}, |
399 | { SAFNUM_UNICAST, "Unicast"}, | |
400 | { SAFNUM_MULTICAST, "Multicast"}, | |
401 | { SAFNUM_UNIMULTICAST, "Unicast+Multicast"}, | |
402 | { SAFNUM_LABUNICAST, "labeled Unicast"}, | |
403 | { SAFNUM_TUNNEL, "Tunnel"}, | |
404 | { SAFNUM_VPLS, "VPLS"}, | |
405 | { SAFNUM_MDT, "MDT"}, | |
ed775ee7 | 406 | { SAFNUM_EVPN, "EVPN"}, |
c8cf0f94 PA |
407 | { SAFNUM_VPNUNICAST, "labeled VPN Unicast"}, |
408 | { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"}, | |
409 | { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"}, | |
ea7b4bf5 PA |
410 | { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"}, |
411 | { SAFNUM_MULTICAST_VPN, "Multicast VPN"}, | |
c8cf0f94 PA |
412 | { 0, NULL } |
413 | }; | |
414 | ||
415 | /* well-known community */ | |
ed775ee7 AHJ |
416 | #define BGP_COMMUNITY_NO_EXPORT 0xffffff01 |
417 | #define BGP_COMMUNITY_NO_ADVERT 0xffffff02 | |
418 | #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03 | |
c8cf0f94 | 419 | |
ed775ee7 | 420 | /* Extended community type - RFC 4360 */ |
c8cf0f94 PA |
421 | #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */ |
422 | #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */ | |
423 | #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */ | |
424 | #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */ | |
425 | #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */ | |
426 | #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */ | |
427 | #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */ | |
428 | /* rfc2547 bgp-mpls-vpns */ | |
c8cf0f94 | 429 | #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */ |
ed775ee7 AHJ |
430 | #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatibility */ |
431 | #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatibility */ | |
432 | #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatibility */ | |
c8cf0f94 PA |
433 | |
434 | #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */ | |
ed775ee7 AHJ |
435 | #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatibility */ |
436 | #define BGP_EXT_COM_ENCAP 0x030c /* rfc5512 */ | |
c8cf0f94 PA |
437 | |
438 | #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */ | |
ed775ee7 | 439 | #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatibility */ |
c8cf0f94 PA |
440 | |
441 | #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */ | |
442 | ||
27bfbee1 PA |
443 | #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */ |
444 | #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */ | |
445 | #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */ | |
446 | #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */ | |
447 | ||
ed775ee7 AHJ |
448 | /* https://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */ |
449 | #define BGP_EXT_COM_EIGRP_GEN 0x8800 | |
450 | #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801 | |
451 | #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802 | |
452 | #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803 | |
453 | #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804 | |
c8cf0f94 PA |
454 | #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805 |
455 | ||
411677ae | 456 | static const struct tok bgp_extd_comm_flag_values[] = { |
c8cf0f94 PA |
457 | { 0x8000, "vendor-specific"}, |
458 | { 0x4000, "non-transitive"}, | |
459 | { 0, NULL}, | |
460 | }; | |
461 | ||
411677ae | 462 | static const struct tok bgp_extd_comm_subtype_values[] = { |
c8cf0f94 PA |
463 | { BGP_EXT_COM_RT_0, "target"}, |
464 | { BGP_EXT_COM_RT_1, "target"}, | |
465 | { BGP_EXT_COM_RT_2, "target"}, | |
466 | { BGP_EXT_COM_RO_0, "origin"}, | |
467 | { BGP_EXT_COM_RO_1, "origin"}, | |
468 | { BGP_EXT_COM_RO_2, "origin"}, | |
469 | { BGP_EXT_COM_LINKBAND, "link-BW"}, | |
c8cf0f94 PA |
470 | { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"}, |
471 | { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"}, | |
472 | { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"}, | |
473 | { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"}, | |
474 | { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"}, | |
475 | { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"}, | |
ed775ee7 | 476 | { BGP_EXT_COM_ENCAP, "encapsulation"}, |
c8cf0f94 PA |
477 | { BGP_EXT_COM_OSPF_RID, "ospf-router-id"}, |
478 | { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"}, | |
411677ae | 479 | { BGP_EXT_COM_L2INFO, "layer2-info"}, |
ed775ee7 AHJ |
480 | { BGP_EXT_COM_EIGRP_GEN, "eigrp-general-route (flag, tag)" }, |
481 | { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY, "eigrp-route-metric (AS, delay)" }, | |
482 | { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW, "eigrp-route-metric (reliability, nexthop, bandwidth)" }, | |
483 | { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU, "eigrp-route-metric (load, MTU)" }, | |
484 | { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID, "eigrp-external-route (remote-AS, remote-ID)" }, | |
485 | { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC, "eigrp-external-route (remote-proto, remote-metric)" }, | |
ea7b4bf5 PA |
486 | { BGP_EXT_COM_SOURCE_AS, "source-AS" }, |
487 | { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"}, | |
27bfbee1 PA |
488 | { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"}, |
489 | { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"}, | |
c8cf0f94 PA |
490 | { 0, NULL}, |
491 | }; | |
492 | ||
ed775ee7 AHJ |
493 | /* RFC RFC5512 BGP Tunnel Encapsulation Attribute Tunnel Types */ |
494 | #define BGP_ENCAP_TUNNEL_L2TPV3_IP 1 | |
495 | #define BGP_ENCAP_TUNNEL_GRE 2 | |
496 | #define BGP_ENCAP_TUNNEL_TRANSMIT 3 | |
497 | #define BGP_ENCAP_TUNNEL_IPSEC 4 | |
498 | #define BGP_ENCAP_TUNNEL_IP_IPSEC 5 | |
499 | #define BGP_ENCAP_TUNNEL_MPLS_IP 6 | |
500 | #define BGP_ENCAP_TUNNEL_IP_IP 7 | |
501 | #define BGP_ENCAP_TUNNEL_VXLAN 8 | |
502 | #define BGP_ENCAP_TUNNEL_NVGRE 9 | |
503 | #define BGP_ENCAP_TUNNEL_MPLS 10 | |
504 | #define BGP_ENCAP_TUNNEL_MPLS_GRE 11 | |
505 | #define BGP_ENCAP_TUNNEL_VXLAN_GPE 12 | |
506 | #define BGP_ENCAP_TUNNEL_MPLS_UDP 13 | |
507 | #define BGP_ENCAP_TUNNEL_IPV6 14 | |
508 | #define BGP_ENCAP_TUNNEL_SR_TE 15 | |
509 | #define BGP_ENCAP_TUNNEL_BARE 16 | |
510 | #define BGP_ENCAP_TUNNEL_SR 17 | |
511 | ||
512 | static const struct tok bgp_extd_comm_encap_tunnel_values[] = { | |
513 | { BGP_ENCAP_TUNNEL_L2TPV3_IP, "L2TPv3 over IP"}, | |
514 | { BGP_ENCAP_TUNNEL_GRE, "GRE"}, | |
515 | { BGP_ENCAP_TUNNEL_TRANSMIT, "Transmit Tunnel"}, | |
516 | { BGP_ENCAP_TUNNEL_IPSEC, "IPsec"}, | |
517 | { BGP_ENCAP_TUNNEL_IP_IPSEC, "IP in IP with IPsec"}, | |
518 | { BGP_ENCAP_TUNNEL_MPLS_IP, "MPLS in IP with IPsec"}, | |
519 | { BGP_ENCAP_TUNNEL_IP_IP, "IP in IP"}, | |
520 | { BGP_ENCAP_TUNNEL_VXLAN, "VXLAN"}, | |
521 | { BGP_ENCAP_TUNNEL_NVGRE, "NVGRE"}, | |
522 | { BGP_ENCAP_TUNNEL_MPLS, "MPLS"}, | |
523 | { BGP_ENCAP_TUNNEL_MPLS_GRE, "MPLS in GRE"}, | |
524 | { BGP_ENCAP_TUNNEL_VXLAN_GPE, "VXLAN GPE"}, | |
525 | { BGP_ENCAP_TUNNEL_MPLS_UDP, "MPLS in UDP"}, | |
526 | { BGP_ENCAP_TUNNEL_IPV6, "IPv6"}, | |
527 | { BGP_ENCAP_TUNNEL_SR_TE, "SR TE"}, | |
528 | { BGP_ENCAP_TUNNEL_BARE, "Bare"}, | |
529 | { BGP_ENCAP_TUNNEL_SR, "SR"}, | |
530 | { 0, NULL}, | |
531 | }; | |
532 | ||
c8cf0f94 PA |
533 | /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */ |
534 | #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */ | |
535 | #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */ | |
536 | #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */ | |
537 | #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */ | |
538 | #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/ | |
539 | #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */ | |
540 | #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */ | |
541 | ||
411677ae AL |
542 | static const struct tok bgp_extd_comm_ospf_rtype_values[] = { |
543 | { BGP_OSPF_RTYPE_RTR, "Router" }, | |
544 | { BGP_OSPF_RTYPE_NET, "Network" }, | |
545 | { BGP_OSPF_RTYPE_SUM, "Summary" }, | |
546 | { BGP_OSPF_RTYPE_EXT, "External" }, | |
c8cf0f94 | 547 | { BGP_OSPF_RTYPE_NSSA,"NSSA External" }, |
411677ae AL |
548 | { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" }, |
549 | { 0, NULL }, | |
550 | }; | |
551 | ||
552 | /* ADD-PATH Send/Receive field values */ | |
553 | static const struct tok bgp_add_path_recvsend[] = { | |
ed775ee7 AHJ |
554 | { 1, "Receive" }, |
555 | { 2, "Send" }, | |
556 | { 3, "Both" }, | |
557 | { 0, NULL }, | |
c8cf0f94 PA |
558 | }; |
559 | ||
ed775ee7 | 560 | #define AS_STR_SIZE sizeof("xxxxx.xxxxx") |
27bfbee1 PA |
561 | |
562 | /* | |
563 | * as_printf | |
564 | * | |
565 | * Convert an AS number into a string and return string pointer. | |
566 | * | |
411677ae | 567 | * Depending on bflag is set or not, AS number is converted into ASDOT notation |
27bfbee1 PA |
568 | * or plain number notation. |
569 | * | |
570 | */ | |
571 | static char * | |
411677ae | 572 | as_printf(netdissect_options *ndo, |
ed775ee7 | 573 | char *str, size_t size, u_int asnum) |
27bfbee1 | 574 | { |
ed775ee7 AHJ |
575 | if (!ndo->ndo_bflag || asnum <= 0xFFFF) { |
576 | snprintf(str, size, "%u", asnum); | |
577 | } else { | |
578 | snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF); | |
579 | } | |
580 | return str; | |
27bfbee1 PA |
581 | } |
582 | ||
6263709f PA |
583 | #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv; |
584 | ||
c8cf0f94 | 585 | int |
411677ae | 586 | decode_prefix4(netdissect_options *ndo, |
ed775ee7 | 587 | const u_char *pptr, u_int itemlen, char *buf, size_t buflen) |
c8cf0f94 | 588 | { |
ed775ee7 AHJ |
589 | nd_ipv4 addr; |
590 | u_int plen, plenbytes; | |
591 | ||
592 | ITEMCHECK(1); | |
593 | plen = GET_U_1(pptr); | |
594 | if (32 < plen) | |
595 | return -1; | |
596 | itemlen -= 1; | |
597 | ||
598 | memset(&addr, 0, sizeof(addr)); | |
599 | plenbytes = (plen + 7) / 8; | |
600 | ITEMCHECK(plenbytes); | |
601 | GET_CPY_BYTES(&addr, pptr + 1, plenbytes); | |
602 | if (plen % 8) { | |
603 | ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff); | |
604 | } | |
605 | snprintf(buf, buflen, "%s/%u", ipaddr_string(ndo, (const u_char *)&addr), plen); | |
606 | return 1 + plenbytes; | |
6263709f PA |
607 | |
608 | badtlv: | |
ed775ee7 | 609 | return -2; |
c8cf0f94 PA |
610 | } |
611 | ||
612 | static int | |
411677ae | 613 | decode_labeled_prefix4(netdissect_options *ndo, |
ed775ee7 AHJ |
614 | const u_char *pptr, u_int itemlen, char *buf, |
615 | size_t buflen) | |
c8cf0f94 | 616 | { |
ed775ee7 AHJ |
617 | nd_ipv4 addr; |
618 | u_int plen, plenbytes; | |
619 | ||
620 | /* prefix length and label = 4 bytes */ | |
621 | ND_TCHECK_4(pptr); | |
622 | ITEMCHECK(4); | |
623 | plen = GET_U_1(pptr); /* get prefix length */ | |
624 | ||
625 | /* this is one of the weirdnesses of rfc3107 | |
626 | the label length (actually the label + COS bits) | |
627 | is added to the prefix length; | |
628 | we also do only read out just one label - | |
629 | there is no real application for advertisement of | |
630 | stacked labels in a single BGP message | |
631 | */ | |
632 | ||
633 | if (24 > plen) | |
634 | return -1; | |
635 | ||
636 | plen-=24; /* adjust prefixlen - labellength */ | |
637 | ||
638 | if (32 < plen) | |
639 | return -1; | |
640 | itemlen -= 4; | |
641 | ||
642 | memset(&addr, 0, sizeof(addr)); | |
643 | plenbytes = (plen + 7) / 8; | |
644 | ITEMCHECK(plenbytes); | |
645 | GET_CPY_BYTES(&addr, pptr + 4, plenbytes); | |
646 | if (plen % 8) { | |
647 | ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff); | |
648 | } | |
649 | /* the label may get offsetted by 4 bits so lets shift it right */ | |
650 | snprintf(buf, buflen, "%s/%u, label:%u %s", | |
651 | ipaddr_string(ndo, (const u_char *)&addr), | |
652 | plen, | |
653 | GET_BE_U_3(pptr + 1)>>4, | |
654 | ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); | |
c8cf0f94 | 655 | |
ed775ee7 | 656 | return 4 + plenbytes; |
c8cf0f94 PA |
657 | |
658 | trunc: | |
ed775ee7 | 659 | return -2; |
6263709f PA |
660 | |
661 | badtlv: | |
ed775ee7 | 662 | return -3; |
c8cf0f94 PA |
663 | } |
664 | ||
ea7b4bf5 PA |
665 | /* |
666 | * bgp_vpn_ip_print | |
667 | * | |
ed775ee7 | 668 | * print an ipv4 or ipv6 address into a buffer dependent on address length. |
ea7b4bf5 PA |
669 | */ |
670 | static char * | |
411677ae AL |
671 | bgp_vpn_ip_print(netdissect_options *ndo, |
672 | const u_char *pptr, u_int addr_length) | |
673 | { | |
ea7b4bf5 PA |
674 | |
675 | /* worst case string is s fully formatted v6 address */ | |
676 | static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")]; | |
677 | char *pos = addr; | |
678 | ||
679 | switch(addr_length) { | |
ed775ee7 AHJ |
680 | case (sizeof(nd_ipv4) << 3): /* 32 */ |
681 | snprintf(pos, sizeof(addr), "%s", GET_IPADDR_STRING(pptr)); | |
ea7b4bf5 | 682 | break; |
ed775ee7 AHJ |
683 | case (sizeof(nd_ipv6) << 3): /* 128 */ |
684 | snprintf(pos, sizeof(addr), "%s", GET_IP6ADDR_STRING(pptr)); | |
ea7b4bf5 | 685 | break; |
ea7b4bf5 PA |
686 | default: |
687 | snprintf(pos, sizeof(addr), "bogus address length %u", addr_length); | |
688 | break; | |
689 | } | |
690 | pos += strlen(pos); | |
691 | ||
ea7b4bf5 PA |
692 | *(pos) = '\0'; |
693 | return (addr); | |
694 | } | |
695 | ||
696 | /* | |
697 | * bgp_vpn_sg_print | |
698 | * | |
699 | * print an multicast s,g entry into a buffer. | |
700 | * the s,g entry is encoded like this. | |
701 | * | |
702 | * +-----------------------------------+ | |
703 | * | Multicast Source Length (1 octet) | | |
704 | * +-----------------------------------+ | |
705 | * | Multicast Source (Variable) | | |
706 | * +-----------------------------------+ | |
707 | * | Multicast Group Length (1 octet) | | |
708 | * +-----------------------------------+ | |
709 | * | Multicast Group (Variable) | | |
710 | * +-----------------------------------+ | |
711 | * | |
712 | * return the number of bytes read from the wire. | |
713 | */ | |
ed775ee7 | 714 | static u_int |
411677ae | 715 | bgp_vpn_sg_print(netdissect_options *ndo, |
ed775ee7 | 716 | const u_char *pptr, char *buf, size_t buflen) |
411677ae AL |
717 | { |
718 | uint8_t addr_length; | |
ea7b4bf5 PA |
719 | u_int total_length, offset; |
720 | ||
721 | total_length = 0; | |
722 | ||
723 | /* Source address length, encoded in bits */ | |
ed775ee7 AHJ |
724 | addr_length = GET_U_1(pptr); |
725 | pptr++; | |
ea7b4bf5 PA |
726 | |
727 | /* Source address */ | |
ed775ee7 | 728 | ND_TCHECK_LEN(pptr, (addr_length >> 3)); |
ea7b4bf5 | 729 | total_length += (addr_length >> 3) + 1; |
ed775ee7 | 730 | offset = (u_int)strlen(buf); |
ea7b4bf5 PA |
731 | if (addr_length) { |
732 | snprintf(buf + offset, buflen - offset, ", Source %s", | |
ed775ee7 | 733 | bgp_vpn_ip_print(ndo, pptr, addr_length)); |
ea7b4bf5 PA |
734 | pptr += (addr_length >> 3); |
735 | } | |
411677ae | 736 | |
ea7b4bf5 | 737 | /* Group address length, encoded in bits */ |
ed775ee7 AHJ |
738 | addr_length = GET_U_1(pptr); |
739 | pptr++; | |
ea7b4bf5 PA |
740 | |
741 | /* Group address */ | |
ed775ee7 | 742 | ND_TCHECK_LEN(pptr, (addr_length >> 3)); |
ea7b4bf5 | 743 | total_length += (addr_length >> 3) + 1; |
ed775ee7 | 744 | offset = (u_int)strlen(buf); |
ea7b4bf5 PA |
745 | if (addr_length) { |
746 | snprintf(buf + offset, buflen - offset, ", Group %s", | |
ed775ee7 | 747 | bgp_vpn_ip_print(ndo, pptr, addr_length)); |
ea7b4bf5 PA |
748 | pptr += (addr_length >> 3); |
749 | } | |
750 | ||
751 | trunc: | |
752 | return (total_length); | |
753 | } | |
754 | ||
ed775ee7 AHJ |
755 | /* Print an RFC 4364 Route Distinguisher */ |
756 | const char * | |
411677ae AL |
757 | bgp_vpn_rd_print(netdissect_options *ndo, |
758 | const u_char *pptr) | |
759 | { | |
ed775ee7 AHJ |
760 | /* allocate space for the largest possible string */ |
761 | static char rd[sizeof("xxxxx.xxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")]; | |
c8cf0f94 | 762 | char *pos = rd; |
ed775ee7 AHJ |
763 | /* allocate space for the largest possible string */ |
764 | char astostr[AS_STR_SIZE]; | |
c8cf0f94 PA |
765 | |
766 | /* ok lets load the RD format */ | |
ed775ee7 | 767 | switch (GET_BE_U_2(pptr)) { |
c8cf0f94 | 768 | |
c8cf0f94 | 769 | case 0: |
ed775ee7 | 770 | /* 2-byte-AS:number fmt */ |
ea7b4bf5 | 771 | snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)", |
ed775ee7 AHJ |
772 | GET_BE_U_2(pptr + 2), |
773 | GET_BE_U_4(pptr + 4), | |
774 | GET_U_1(pptr + 4), GET_U_1(pptr + 5), | |
775 | GET_U_1(pptr + 6), GET_U_1(pptr + 7)); | |
c8cf0f94 | 776 | break; |
c8cf0f94 PA |
777 | |
778 | case 1: | |
ed775ee7 | 779 | /* IP-address:AS fmt */ |
c8cf0f94 | 780 | snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u", |
ed775ee7 AHJ |
781 | GET_U_1(pptr + 2), GET_U_1(pptr + 3), |
782 | GET_U_1(pptr + 4), GET_U_1(pptr + 5), | |
783 | GET_BE_U_2(pptr + 6)); | |
c8cf0f94 PA |
784 | break; |
785 | ||
c8cf0f94 | 786 | case 2: |
ed775ee7 AHJ |
787 | /* 4-byte-AS:number fmt */ |
788 | snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)", | |
789 | as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 2)), | |
790 | GET_BE_U_2(pptr + 6), GET_U_1(pptr + 2), | |
791 | GET_U_1(pptr + 3), GET_U_1(pptr + 4), | |
792 | GET_U_1(pptr + 5), GET_BE_U_2(pptr + 6)); | |
c8cf0f94 PA |
793 | break; |
794 | default: | |
795 | snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format"); | |
796 | break; | |
797 | } | |
798 | pos += strlen(pos); | |
799 | *(pos) = '\0'; | |
800 | return (rd); | |
801 | } | |
802 | ||
ed775ee7 AHJ |
803 | /* |
804 | * Print an RFC 4360 Extended Community. | |
805 | */ | |
806 | static void | |
807 | bgp_extended_community_print(netdissect_options *ndo, | |
808 | const u_char *pptr) | |
c8cf0f94 | 809 | { |
ed775ee7 AHJ |
810 | union { /* copy buffer for bandwidth values */ |
811 | float f; | |
812 | uint32_t i; | |
813 | } bw; | |
814 | /* allocate space for the largest possible string */ | |
815 | char astostr[AS_STR_SIZE]; | |
816 | ||
817 | switch (GET_BE_U_2(pptr)) { | |
818 | ||
819 | case BGP_EXT_COM_RT_0: | |
820 | case BGP_EXT_COM_RO_0: | |
821 | case BGP_EXT_COM_L2VPN_RT_0: | |
822 | ND_PRINT("%u:%u (= %s)", | |
823 | GET_BE_U_2(pptr + 2), | |
824 | GET_BE_U_4(pptr + 4), | |
825 | GET_IPADDR_STRING(pptr+4)); | |
826 | break; | |
827 | ||
828 | case BGP_EXT_COM_RT_1: | |
829 | case BGP_EXT_COM_RO_1: | |
830 | case BGP_EXT_COM_L2VPN_RT_1: | |
831 | case BGP_EXT_COM_VRF_RT_IMP: | |
832 | ND_PRINT("%s:%u", | |
833 | GET_IPADDR_STRING(pptr+2), | |
834 | GET_BE_U_2(pptr + 6)); | |
835 | break; | |
c8cf0f94 | 836 | |
ed775ee7 AHJ |
837 | case BGP_EXT_COM_RT_2: |
838 | case BGP_EXT_COM_RO_2: | |
839 | ND_PRINT("%s:%u", | |
840 | as_printf(ndo, astostr, sizeof(astostr), | |
841 | GET_BE_U_4(pptr + 2)), GET_BE_U_2(pptr + 6)); | |
842 | break; | |
c8cf0f94 | 843 | |
ed775ee7 AHJ |
844 | case BGP_EXT_COM_LINKBAND: |
845 | bw.i = GET_BE_U_4(pptr + 2); | |
846 | ND_PRINT("bandwidth: %.3f Mbps", | |
847 | bw.f*8/1000000); | |
848 | break; | |
849 | ||
850 | case BGP_EXT_COM_VPN_ORIGIN: | |
851 | case BGP_EXT_COM_VPN_ORIGIN2: | |
852 | case BGP_EXT_COM_VPN_ORIGIN3: | |
853 | case BGP_EXT_COM_VPN_ORIGIN4: | |
854 | case BGP_EXT_COM_OSPF_RID: | |
855 | case BGP_EXT_COM_OSPF_RID2: | |
856 | ND_PRINT("%s", GET_IPADDR_STRING(pptr+2)); | |
857 | break; | |
858 | ||
859 | case BGP_EXT_COM_OSPF_RTYPE: | |
860 | case BGP_EXT_COM_OSPF_RTYPE2: | |
861 | ND_PRINT("area:%s, router-type:%s, metric-type:%s%s", | |
862 | GET_IPADDR_STRING(pptr+2), | |
863 | tok2str(bgp_extd_comm_ospf_rtype_values, | |
864 | "unknown (0x%02x)", | |
865 | GET_U_1((pptr + 6))), | |
866 | (GET_U_1(pptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "", | |
867 | ((GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_EXT) || (GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""); | |
868 | break; | |
869 | ||
870 | case BGP_EXT_COM_L2INFO: | |
871 | ND_PRINT("%s Control Flags [0x%02x]:MTU %u", | |
872 | tok2str(l2vpn_encaps_values, | |
873 | "unknown encaps", | |
874 | GET_U_1((pptr + 2))), | |
875 | GET_U_1((pptr + 3)), | |
876 | GET_BE_U_2(pptr + 4)); | |
877 | break; | |
c8cf0f94 | 878 | |
ed775ee7 AHJ |
879 | case BGP_EXT_COM_SOURCE_AS: |
880 | ND_PRINT("AS %u", GET_BE_U_2(pptr + 2)); | |
881 | break; | |
c8cf0f94 | 882 | |
ed775ee7 AHJ |
883 | case BGP_EXT_COM_ENCAP: |
884 | ND_PRINT("Tunnel type: %s", tok2str(bgp_extd_comm_encap_tunnel_values, | |
885 | "unknown encaps", | |
886 | GET_BE_U_2(pptr + 6))); | |
887 | break; | |
411677ae | 888 | |
ed775ee7 AHJ |
889 | default: |
890 | ND_PRINT("%02x%02x%02x%02x%02x%02x", | |
891 | GET_U_1(pptr + 2), | |
892 | GET_U_1(pptr + 3), | |
893 | GET_U_1(pptr + 4), | |
894 | GET_U_1(pptr + 5), | |
895 | GET_U_1(pptr + 6), | |
896 | GET_U_1(pptr + 7)); | |
897 | break; | |
898 | } | |
899 | } | |
c8cf0f94 | 900 | |
ed775ee7 AHJ |
901 | /* |
902 | * RFC4684 (Section 4)/RFC2858 (Section 4). | |
903 | * RTC membership prefix is structured as follows | |
904 | * [prefix-len] [origin-as] [route-target] | |
905 | * The route-target is encoded as RT ext-comms. | |
906 | * Prefix-len may be 0, 32..96 | |
907 | * | |
908 | * Note that pptr is not packet data - it is | |
909 | * a buffer owned by our caller - therefore GET_* | |
910 | * macros can not be used. | |
911 | */ | |
912 | static char * | |
913 | bgp_rt_prefix_print(netdissect_options *ndo, | |
914 | const u_char *pptr, | |
915 | u_int plen) | |
916 | { | |
917 | /* allocate space for the largest possible string */ | |
918 | char rtc_prefix_in_hex[20] = ""; | |
919 | u_int rtc_prefix_in_hex_len = 0; | |
920 | static char output[61]; /* max response string */ | |
921 | /* allocate space for the largest possible string */ | |
922 | char astostr[AS_STR_SIZE]; | |
923 | uint16_t ec_type = 0; | |
924 | u_int octet_count; | |
925 | u_int i; | |
926 | ||
927 | if (plen == 0) { | |
928 | snprintf(output, sizeof(output), "route-target: 0:0/0"); | |
929 | return (output); | |
930 | } | |
c8cf0f94 | 931 | |
ed775ee7 AHJ |
932 | /* hex representation of the prefix */ |
933 | octet_count = (plen+7)/8; | |
934 | for (i=0; i<octet_count; i++) { | |
935 | rtc_prefix_in_hex_len += snprintf(rtc_prefix_in_hex+rtc_prefix_in_hex_len, | |
936 | sizeof(rtc_prefix_in_hex)-rtc_prefix_in_hex_len, | |
937 | "%02x%s", *(pptr+i), | |
938 | ((i%2 == 1) && (i<octet_count-1)) ? " " : ""); | |
939 | } | |
940 | ||
941 | if (plen < 16) { | |
942 | /* | |
943 | * The prefix is too short to include the full ext-comm type, | |
944 | * so we have no way to parse it further. | |
411677ae | 945 | */ |
ed775ee7 AHJ |
946 | snprintf(output, sizeof(output), "route-target: partial-type: (%s/%d)", |
947 | rtc_prefix_in_hex, plen); | |
948 | return (output); | |
949 | } | |
950 | ||
951 | /* | |
952 | * get the ext-comm type | |
953 | * Note: pptr references a static 8 octet buffer with unused bits set to 0, | |
954 | * hense EXTRACT_*() macros are safe. | |
955 | */ | |
956 | ec_type = EXTRACT_BE_U_2(pptr); | |
957 | switch (ec_type) { | |
958 | case BGP_EXT_COM_RT_0: | |
959 | /* 2-byte-AS:number fmt */ | |
960 | snprintf(output, sizeof(output), "route-target: %u:%u/%d (%s)", | |
961 | EXTRACT_BE_U_2(pptr+2), | |
962 | EXTRACT_BE_U_4(pptr+4), | |
963 | plen, rtc_prefix_in_hex); | |
964 | break; | |
c8cf0f94 | 965 | |
ed775ee7 AHJ |
966 | case BGP_EXT_COM_RT_1: |
967 | /* IP-address:AS fmt */ | |
968 | snprintf(output, sizeof(output), "route-target: %u.%u.%u.%u:%u/%d (%s)", | |
969 | *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), | |
970 | EXTRACT_BE_U_2(pptr+6), plen, rtc_prefix_in_hex); | |
971 | break; | |
c8cf0f94 | 972 | |
ed775ee7 AHJ |
973 | case BGP_EXT_COM_RT_2: |
974 | /* 4-byte-AS:number fmt */ | |
975 | snprintf(output, sizeof(output), "route-target: %s:%u/%d (%s)", | |
976 | as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(pptr+2)), | |
977 | EXTRACT_BE_U_2(pptr+6), plen, rtc_prefix_in_hex); | |
978 | break; | |
979 | ||
980 | default: | |
981 | snprintf(output, sizeof(output), "route target: unknown-type(%04x) (%s/%d)", | |
982 | ec_type, | |
983 | rtc_prefix_in_hex, plen); | |
984 | break; | |
985 | } | |
986 | return (output); | |
c8cf0f94 PA |
987 | } |
988 | ||
ed775ee7 | 989 | /* RFC 4684 */ |
c8cf0f94 | 990 | static int |
ed775ee7 AHJ |
991 | decode_rt_routing_info(netdissect_options *ndo, |
992 | const u_char *pptr) | |
c8cf0f94 | 993 | { |
ed775ee7 AHJ |
994 | uint8_t route_target[8]; |
995 | u_int plen; | |
996 | /* allocate space for the largest possible string */ | |
997 | char astostr[AS_STR_SIZE]; | |
998 | u_int num_octets; | |
999 | ||
1000 | /* NLRI "prefix length" from RFC 2858 Section 4. */ | |
1001 | plen = GET_U_1(pptr); /* get prefix length */ | |
1002 | ||
1003 | /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits. | |
1004 | * RFC 4684 Section 4 defines the layout of "origin AS" and "route | |
1005 | * target" fields inside the "prefix" depending on its length. | |
1006 | */ | |
1007 | if (0 == plen) { | |
1008 | /* Without "origin AS", without "route target". */ | |
1009 | ND_PRINT("\n\t default route target"); | |
1010 | return 1; | |
1011 | } | |
c8cf0f94 | 1012 | |
ed775ee7 AHJ |
1013 | if (32 > plen) { |
1014 | ND_PRINT("\n\t (illegal prefix length)"); | |
1015 | return -1; | |
1016 | } | |
c8cf0f94 | 1017 | |
ed775ee7 AHJ |
1018 | /* With at least "origin AS", possibly with "route target". */ |
1019 | as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 1)); | |
c8cf0f94 | 1020 | |
ed775ee7 | 1021 | plen -= 32; /* adjust prefix length */ |
c8cf0f94 | 1022 | |
ed775ee7 AHJ |
1023 | if (64 < plen) { |
1024 | ND_PRINT("\n\t (illegal prefix length)"); | |
1025 | return -1; | |
1026 | } | |
c8cf0f94 | 1027 | |
ed775ee7 AHJ |
1028 | /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 } |
1029 | * and gives the number of octets in the variable-length "route | |
1030 | * target" field inside this NLRI "prefix". Look for it. | |
1031 | */ | |
1032 | memset(&route_target, 0, sizeof(route_target)); | |
1033 | num_octets = (plen + 7) / 8; | |
1034 | GET_CPY_BYTES(&route_target, pptr + 5, num_octets); | |
1035 | /* If mask-len is not on octet boundary, ensure all extra bits are 0 */ | |
1036 | if (plen % 8) { | |
1037 | ((u_char *)&route_target)[num_octets - 1] &= | |
1038 | ((0xff00 >> (plen % 8)) & 0xff); | |
1039 | } | |
1040 | ND_PRINT("\n\t origin AS: %s, %s", | |
1041 | astostr, | |
1042 | bgp_rt_prefix_print(ndo, (u_char *)&route_target, plen)); | |
c8cf0f94 | 1043 | |
ed775ee7 AHJ |
1044 | return 5 + num_octets; |
1045 | } | |
c8cf0f94 | 1046 | |
ed775ee7 AHJ |
1047 | static int |
1048 | decode_labeled_vpn_prefix4(netdissect_options *ndo, | |
1049 | const u_char *pptr, char *buf, size_t buflen) | |
1050 | { | |
1051 | nd_ipv4 addr; | |
1052 | u_int plen; | |
1053 | ||
1054 | plen = GET_U_1(pptr); /* get prefix length */ | |
1055 | ||
1056 | if ((24+64) > plen) | |
1057 | return -1; | |
1058 | ||
1059 | plen -= (24+64); /* adjust prefixlen - labellength - RD len*/ | |
1060 | ||
1061 | if (32 < plen) | |
1062 | return -1; | |
1063 | ||
1064 | memset(&addr, 0, sizeof(addr)); | |
1065 | GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8); | |
1066 | if (plen % 8) { | |
1067 | ((u_char *)&addr)[(plen + 7) / 8 - 1] &= | |
1068 | ((0xff00 >> (plen % 8)) & 0xff); | |
1069 | } | |
1070 | /* the label may get offsetted by 4 bits so lets shift it right */ | |
1071 | snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s", | |
1072 | bgp_vpn_rd_print(ndo, pptr+4), | |
1073 | ipaddr_string(ndo, (const u_char *)&addr), | |
1074 | plen, | |
1075 | GET_BE_U_3(pptr + 1)>>4, | |
1076 | ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); | |
1077 | ||
1078 | return 12 + (plen + 7) / 8; | |
c8cf0f94 PA |
1079 | } |
1080 | ||
27bfbee1 PA |
1081 | /* |
1082 | * +-------------------------------+ | |
1083 | * | | | |
1084 | * | RD:IPv4-address (12 octets) | | |
1085 | * | | | |
1086 | * +-------------------------------+ | |
1087 | * | MDT Group-address (4 octets) | | |
1088 | * +-------------------------------+ | |
1089 | */ | |
1090 | ||
1091 | #define MDT_VPN_NLRI_LEN 16 | |
1092 | ||
1093 | static int | |
411677ae | 1094 | decode_mdt_vpn_nlri(netdissect_options *ndo, |
ed775ee7 | 1095 | const u_char *pptr, char *buf, size_t buflen) |
27bfbee1 | 1096 | { |
27bfbee1 PA |
1097 | const u_char *rd; |
1098 | const u_char *vpn_ip; | |
411677ae | 1099 | |
27bfbee1 | 1100 | /* if the NLRI is not predefined length, quit.*/ |
ed775ee7 AHJ |
1101 | if (GET_U_1(pptr) != MDT_VPN_NLRI_LEN * 8) |
1102 | return -1; | |
27bfbee1 PA |
1103 | pptr++; |
1104 | ||
1105 | /* RD */ | |
ed775ee7 | 1106 | ND_TCHECK_8(pptr); |
27bfbee1 | 1107 | rd = pptr; |
ed775ee7 | 1108 | pptr += 8; |
27bfbee1 PA |
1109 | |
1110 | /* IPv4 address */ | |
27bfbee1 | 1111 | vpn_ip = pptr; |
ed775ee7 | 1112 | pptr += sizeof(nd_ipv4); |
27bfbee1 PA |
1113 | |
1114 | /* MDT Group Address */ | |
27bfbee1 | 1115 | snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s", |
ed775ee7 | 1116 | bgp_vpn_rd_print(ndo, rd), GET_IPADDR_STRING(vpn_ip), GET_IPADDR_STRING(pptr)); |
411677ae | 1117 | |
27bfbee1 PA |
1118 | return MDT_VPN_NLRI_LEN + 1; |
1119 | ||
1120 | trunc: | |
ed775ee7 | 1121 | return -2; |
27bfbee1 PA |
1122 | } |
1123 | ||
ea7b4bf5 PA |
1124 | #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1 |
1125 | #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2 | |
1126 | #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3 | |
1127 | #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4 | |
1128 | #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5 | |
1129 | #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6 | |
1130 | #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7 | |
1131 | ||
411677ae | 1132 | static const struct tok bgp_multicast_vpn_route_type_values[] = { |
ea7b4bf5 PA |
1133 | { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"}, |
1134 | { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"}, | |
1135 | { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"}, | |
1136 | { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"}, | |
1137 | { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"}, | |
1138 | { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"}, | |
1139 | { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"}, | |
411677ae | 1140 | { 0, NULL} |
ea7b4bf5 PA |
1141 | }; |
1142 | ||
1143 | static int | |
411677ae | 1144 | decode_multicast_vpn(netdissect_options *ndo, |
ed775ee7 | 1145 | const u_char *pptr, char *buf, size_t buflen) |
ea7b4bf5 | 1146 | { |
ed775ee7 AHJ |
1147 | /* allocate space for the largest possible string */ |
1148 | char astostr[AS_STR_SIZE]; | |
1149 | uint8_t route_type, route_length; | |
1150 | u_int addr_length, sg_length; | |
1151 | u_int offset; | |
1152 | ||
1153 | route_type = GET_U_1(pptr); | |
1154 | pptr++; | |
1155 | route_length = GET_U_1(pptr); | |
1156 | pptr++; | |
ea7b4bf5 | 1157 | |
ed775ee7 AHJ |
1158 | snprintf(buf, buflen, "Route-Type: %s (%u), length: %u", |
1159 | tok2str(bgp_multicast_vpn_route_type_values, | |
1160 | "Unknown", route_type), | |
1161 | route_type, route_length); | |
1162 | ||
1163 | switch(route_type) { | |
1164 | case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI: | |
1165 | ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN); | |
1166 | offset = (u_int)strlen(buf); | |
1167 | snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s", | |
1168 | bgp_vpn_rd_print(ndo, pptr), | |
1169 | bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN, | |
1170 | (route_length - BGP_VPN_RD_LEN) << 3)); | |
1171 | break; | |
1172 | case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI: | |
1173 | ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4); | |
1174 | offset = (u_int)strlen(buf); | |
1175 | snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", | |
1176 | bgp_vpn_rd_print(ndo, pptr), | |
1177 | as_printf(ndo, astostr, sizeof(astostr), | |
1178 | GET_BE_U_4(pptr + BGP_VPN_RD_LEN))); | |
1179 | break; | |
ea7b4bf5 | 1180 | |
ed775ee7 AHJ |
1181 | case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI: |
1182 | ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN); | |
1183 | offset = (u_int)strlen(buf); | |
1184 | snprintf(buf + offset, buflen - offset, ", RD: %s", | |
1185 | bgp_vpn_rd_print(ndo, pptr)); | |
1186 | pptr += BGP_VPN_RD_LEN; | |
ea7b4bf5 | 1187 | |
ed775ee7 AHJ |
1188 | sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen); |
1189 | addr_length = route_length - sg_length; | |
ea7b4bf5 | 1190 | |
ed775ee7 AHJ |
1191 | ND_TCHECK_LEN(pptr, addr_length); |
1192 | offset = (u_int)strlen(buf); | |
1193 | snprintf(buf + offset, buflen - offset, ", Originator %s", | |
1194 | bgp_vpn_ip_print(ndo, pptr, addr_length << 3)); | |
1195 | break; | |
ea7b4bf5 | 1196 | |
ed775ee7 AHJ |
1197 | case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE: |
1198 | ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN); | |
1199 | offset = (u_int)strlen(buf); | |
1200 | snprintf(buf + offset, buflen - offset, ", RD: %s", | |
1201 | bgp_vpn_rd_print(ndo, pptr)); | |
1202 | pptr += BGP_VPN_RD_LEN; | |
ea7b4bf5 | 1203 | |
ed775ee7 AHJ |
1204 | bgp_vpn_sg_print(ndo, pptr, buf, buflen); |
1205 | break; | |
ea7b4bf5 | 1206 | |
ed775ee7 AHJ |
1207 | case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */ |
1208 | case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN: | |
1209 | ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4); | |
1210 | offset = (u_int)strlen(buf); | |
1211 | snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", | |
1212 | bgp_vpn_rd_print(ndo, pptr), | |
1213 | as_printf(ndo, astostr, sizeof(astostr), | |
1214 | GET_BE_U_4(pptr + BGP_VPN_RD_LEN))); | |
1215 | pptr += BGP_VPN_RD_LEN + 4; | |
1216 | ||
1217 | bgp_vpn_sg_print(ndo, pptr, buf, buflen); | |
1218 | break; | |
1219 | ||
1220 | /* | |
1221 | * no per route-type printing yet. | |
1222 | */ | |
1223 | case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF: | |
1224 | default: | |
1225 | break; | |
1226 | } | |
ea7b4bf5 | 1227 | |
ed775ee7 | 1228 | return route_length + 2; |
ea7b4bf5 PA |
1229 | |
1230 | trunc: | |
ed775ee7 | 1231 | return -2; |
ea7b4bf5 PA |
1232 | } |
1233 | ||
66170f0a PA |
1234 | /* |
1235 | * As I remember, some versions of systems have an snprintf() that | |
1236 | * returns -1 if the buffer would have overflowed. If the return | |
1237 | * value is negative, set buflen to 0, to indicate that we've filled | |
1238 | * the buffer up. | |
1239 | * | |
1240 | * If the return value is greater than buflen, that means that | |
1241 | * the buffer would have overflowed; again, set buflen to 0 in | |
1242 | * that case. | |
1243 | */ | |
411677ae AL |
1244 | #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \ |
1245 | if (stringlen<0) \ | |
1246 | buflen=0; \ | |
1247 | else if ((u_int)stringlen>buflen) \ | |
66170f0a PA |
1248 | buflen=0; \ |
1249 | else { \ | |
411677ae | 1250 | buflen-=stringlen; \ |
ed775ee7 | 1251 | buf+=stringlen; \ |
66170f0a PA |
1252 | } |
1253 | ||
c8cf0f94 | 1254 | static int |
411677ae | 1255 | decode_labeled_vpn_l2(netdissect_options *ndo, |
ed775ee7 | 1256 | const u_char *pptr, char *buf, size_t buflen) |
c8cf0f94 | 1257 | { |
ed775ee7 AHJ |
1258 | u_int plen, tlen, tlv_type, tlv_len, ttlv_len; |
1259 | int stringlen; | |
1260 | ||
1261 | plen = GET_BE_U_2(pptr); | |
1262 | tlen = plen; | |
1263 | pptr += 2; | |
1264 | /* Old and new L2VPN NLRI share AFI/SAFI | |
1265 | * -> Assume a 12 Byte-length NLRI is auto-discovery-only | |
1266 | * and > 17 as old format. Complain for the middle case | |
1267 | */ | |
1268 | if (plen == 12) { | |
1269 | /* assume AD-only with RD, BGPNH */ | |
1270 | ND_TCHECK_LEN(pptr, 12); | |
1271 | buf[0] = '\0'; | |
1272 | stringlen = snprintf(buf, buflen, "RD: %s, BGPNH: %s", | |
1273 | bgp_vpn_rd_print(ndo, pptr), | |
1274 | GET_IPADDR_STRING(pptr+8)); | |
1275 | UPDATE_BUF_BUFLEN(buf, buflen, stringlen); | |
1276 | pptr += 12; | |
1277 | tlen -= 12; | |
1278 | return plen + 2; | |
1279 | } else if (plen > 17) { | |
1280 | /* assume old format */ | |
1281 | /* RD, ID, LBLKOFF, LBLBASE */ | |
1282 | ||
1283 | ND_TCHECK_LEN(pptr, 15); | |
1284 | buf[0] = '\0'; | |
1285 | stringlen = snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u", | |
1286 | bgp_vpn_rd_print(ndo, pptr), | |
1287 | GET_BE_U_2(pptr + 8), | |
1288 | GET_BE_U_2(pptr + 10), | |
1289 | GET_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */ | |
1290 | UPDATE_BUF_BUFLEN(buf, buflen, stringlen); | |
1291 | pptr += 15; | |
1292 | tlen -= 15; | |
1293 | ||
1294 | /* ok now the variable part - lets read out TLVs*/ | |
1295 | while (tlen != 0) { | |
1296 | if (tlen < 3) { | |
1297 | if (buflen != 0) { | |
1298 | stringlen=snprintf(buf,buflen, "\n\t\tran past the end"); | |
1299 | UPDATE_BUF_BUFLEN(buf, buflen, stringlen); | |
1300 | } | |
1301 | return plen + 2; | |
1302 | } | |
1303 | tlv_type = GET_U_1(pptr); | |
1304 | pptr++; | |
1305 | tlv_len = GET_BE_U_2(pptr); /* length, in *bits* */ | |
1306 | ttlv_len = (tlv_len + 7)/8; /* length, in *bytes* */ | |
1307 | pptr += 2; | |
1308 | ||
1309 | switch(tlv_type) { | |
1310 | case 1: | |
1311 | if (buflen != 0) { | |
1312 | stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x", | |
1313 | tlv_type, | |
1314 | tlv_len); | |
1315 | UPDATE_BUF_BUFLEN(buf, buflen, stringlen); | |
1316 | } | |
1317 | while (ttlv_len != 0) { | |
1318 | if (tlen < 1) { | |
1319 | if (buflen != 0) { | |
1320 | stringlen=snprintf(buf,buflen, " (ran past the end)"); | |
1321 | UPDATE_BUF_BUFLEN(buf, buflen, stringlen); | |
1322 | } | |
1323 | return plen + 2; | |
1324 | } | |
1325 | ND_TCHECK_1(pptr); | |
1326 | if (buflen != 0) { | |
1327 | stringlen=snprintf(buf,buflen, "%02x", | |
1328 | GET_U_1(pptr)); | |
1329 | pptr++; | |
1330 | UPDATE_BUF_BUFLEN(buf, buflen, stringlen); | |
1331 | } | |
1332 | ttlv_len--; | |
1333 | tlen--; | |
1334 | } | |
1335 | break; | |
1336 | default: | |
1337 | if (buflen != 0) { | |
1338 | stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u", | |
1339 | tlv_type, | |
1340 | tlv_len); | |
1341 | UPDATE_BUF_BUFLEN(buf, buflen, stringlen); | |
1342 | } | |
1343 | if (tlen < ttlv_len) { | |
1344 | if (buflen != 0) { | |
1345 | stringlen=snprintf(buf,buflen, " (ran past the end)"); | |
1346 | UPDATE_BUF_BUFLEN(buf, buflen, stringlen); | |
1347 | } | |
1348 | return plen + 2; | |
1349 | } | |
1350 | tlen -= ttlv_len; | |
1351 | break; | |
1352 | } | |
c8cf0f94 | 1353 | } |
ed775ee7 AHJ |
1354 | return plen + 2; |
1355 | } else { | |
1356 | /* complain bitterly ? */ | |
1357 | /* fall through */ | |
1358 | goto trunc; | |
1359 | } | |
c8cf0f94 PA |
1360 | |
1361 | trunc: | |
ed775ee7 | 1362 | return -2; |
c8cf0f94 PA |
1363 | } |
1364 | ||
c8cf0f94 | 1365 | int |
411677ae | 1366 | decode_prefix6(netdissect_options *ndo, |
ed775ee7 | 1367 | const u_char *pd, u_int itemlen, char *buf, size_t buflen) |
c8cf0f94 | 1368 | { |
ed775ee7 AHJ |
1369 | nd_ipv6 addr; |
1370 | u_int plen, plenbytes; | |
1371 | ||
1372 | ITEMCHECK(1); | |
1373 | plen = GET_U_1(pd); | |
1374 | if (128 < plen) | |
1375 | return -1; | |
1376 | itemlen -= 1; | |
1377 | ||
1378 | memset(&addr, 0, sizeof(addr)); | |
1379 | plenbytes = (plen + 7) / 8; | |
1380 | ITEMCHECK(plenbytes); | |
1381 | GET_CPY_BYTES(&addr, pd + 1, plenbytes); | |
1382 | if (plen % 8) { | |
1383 | addr[plenbytes - 1] &= | |
1384 | ((0xff00 >> (plen % 8)) & 0xff); | |
1385 | } | |
1386 | snprintf(buf, buflen, "%s/%u", ip6addr_string(ndo, (const u_char *)&addr), plen); | |
1387 | return 1 + plenbytes; | |
6263709f PA |
1388 | |
1389 | badtlv: | |
ed775ee7 | 1390 | return -2; |
c8cf0f94 PA |
1391 | } |
1392 | ||
1393 | static int | |
411677ae | 1394 | decode_labeled_prefix6(netdissect_options *ndo, |
ed775ee7 | 1395 | const u_char *pptr, u_int itemlen, char *buf, size_t buflen) |
c8cf0f94 | 1396 | { |
ed775ee7 AHJ |
1397 | nd_ipv6 addr; |
1398 | u_int plen, plenbytes; | |
1399 | ||
1400 | /* prefix length and label = 4 bytes */ | |
1401 | ND_TCHECK_4(pptr); | |
1402 | ITEMCHECK(4); | |
1403 | plen = GET_U_1(pptr); /* get prefix length */ | |
1404 | ||
1405 | if (24 > plen) | |
1406 | return -1; | |
1407 | ||
1408 | plen -= 24; /* adjust prefixlen - labellength */ | |
1409 | ||
1410 | if (128 < plen) | |
1411 | return -1; | |
1412 | itemlen -= 4; | |
1413 | ||
1414 | memset(&addr, 0, sizeof(addr)); | |
1415 | plenbytes = (plen + 7) / 8; | |
1416 | GET_CPY_BYTES(&addr, pptr + 4, plenbytes); | |
1417 | if (plen % 8) { | |
1418 | addr[plenbytes - 1] &= | |
1419 | ((0xff00 >> (plen % 8)) & 0xff); | |
1420 | } | |
1421 | /* the label may get offsetted by 4 bits so lets shift it right */ | |
1422 | snprintf(buf, buflen, "%s/%u, label:%u %s", | |
1423 | ip6addr_string(ndo, (const u_char *)&addr), | |
1424 | plen, | |
1425 | GET_BE_U_3(pptr + 1)>>4, | |
1426 | ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); | |
c8cf0f94 | 1427 | |
ed775ee7 | 1428 | return 4 + plenbytes; |
c8cf0f94 PA |
1429 | |
1430 | trunc: | |
ed775ee7 | 1431 | return -2; |
6263709f PA |
1432 | |
1433 | badtlv: | |
ed775ee7 | 1434 | return -3; |
c8cf0f94 PA |
1435 | } |
1436 | ||
1437 | static int | |
411677ae | 1438 | decode_labeled_vpn_prefix6(netdissect_options *ndo, |
ed775ee7 | 1439 | const u_char *pptr, char *buf, size_t buflen) |
c8cf0f94 | 1440 | { |
ed775ee7 AHJ |
1441 | nd_ipv6 addr; |
1442 | u_int plen; | |
c8cf0f94 | 1443 | |
ed775ee7 | 1444 | plen = GET_U_1(pptr); /* get prefix length */ |
c8cf0f94 | 1445 | |
ed775ee7 AHJ |
1446 | if ((24+64) > plen) |
1447 | return -1; | |
c8cf0f94 | 1448 | |
ed775ee7 | 1449 | plen -= (24+64); /* adjust prefixlen - labellength - RD len*/ |
c8cf0f94 | 1450 | |
ed775ee7 AHJ |
1451 | if (128 < plen) |
1452 | return -1; | |
c8cf0f94 | 1453 | |
ed775ee7 AHJ |
1454 | memset(&addr, 0, sizeof(addr)); |
1455 | GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8); | |
1456 | if (plen % 8) { | |
1457 | addr[(plen + 7) / 8 - 1] &= | |
1458 | ((0xff00 >> (plen % 8)) & 0xff); | |
1459 | } | |
1460 | /* the label may get offsetted by 4 bits so lets shift it right */ | |
1461 | snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s", | |
1462 | bgp_vpn_rd_print(ndo, pptr+4), | |
1463 | ip6addr_string(ndo, (const u_char *)&addr), | |
1464 | plen, | |
1465 | GET_BE_U_3(pptr + 1)>>4, | |
1466 | ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); | |
1467 | ||
1468 | return 12 + (plen + 7) / 8; | |
c8cf0f94 | 1469 | } |
c8cf0f94 PA |
1470 | |
1471 | static int | |
411677ae | 1472 | decode_clnp_prefix(netdissect_options *ndo, |
ed775ee7 | 1473 | const u_char *pptr, char *buf, size_t buflen) |
c8cf0f94 | 1474 | { |
ed775ee7 AHJ |
1475 | uint8_t addr[19]; |
1476 | u_int plen; | |
c8cf0f94 | 1477 | |
ed775ee7 | 1478 | plen = GET_U_1(pptr); /* get prefix length */ |
c8cf0f94 | 1479 | |
ed775ee7 AHJ |
1480 | if (152 < plen) |
1481 | return -1; | |
c8cf0f94 | 1482 | |
ed775ee7 AHJ |
1483 | memset(&addr, 0, sizeof(addr)); |
1484 | GET_CPY_BYTES(&addr, pptr + 4, (plen + 7) / 8); | |
1485 | if (plen % 8) { | |
1486 | addr[(plen + 7) / 8 - 1] &= | |
1487 | ((0xff00 >> (plen % 8)) & 0xff); | |
1488 | } | |
1489 | /* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */ | |
1490 | snprintf(buf, buflen, "%s/%u", | |
1491 | isonsap_string(ndo, addr,(plen + 7) / 8), | |
1492 | plen); | |
c8cf0f94 | 1493 | |
ed775ee7 | 1494 | return 1 + (plen + 7) / 8; |
c8cf0f94 PA |
1495 | } |
1496 | ||
1497 | static int | |
411677ae | 1498 | decode_labeled_vpn_clnp_prefix(netdissect_options *ndo, |
ed775ee7 | 1499 | const u_char *pptr, char *buf, size_t buflen) |
c8cf0f94 | 1500 | { |
ed775ee7 AHJ |
1501 | uint8_t addr[19]; |
1502 | u_int plen; | |
c8cf0f94 | 1503 | |
ed775ee7 | 1504 | plen = GET_U_1(pptr); /* get prefix length */ |
c8cf0f94 | 1505 | |
ed775ee7 AHJ |
1506 | if ((24+64) > plen) |
1507 | return -1; | |
c8cf0f94 | 1508 | |
ed775ee7 | 1509 | plen -= (24+64); /* adjust prefixlen - labellength - RD len*/ |
c8cf0f94 | 1510 | |
ed775ee7 AHJ |
1511 | if (152 < plen) |
1512 | return -1; | |
c8cf0f94 | 1513 | |
ed775ee7 AHJ |
1514 | memset(&addr, 0, sizeof(addr)); |
1515 | GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8); | |
1516 | if (plen % 8) { | |
1517 | addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff); | |
1518 | } | |
1519 | /* the label may get offsetted by 4 bits so lets shift it right */ | |
1520 | /* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */ | |
1521 | snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s", | |
1522 | bgp_vpn_rd_print(ndo, pptr+4), | |
1523 | isonsap_string(ndo, addr,(plen + 7) / 8), | |
1524 | plen, | |
1525 | GET_BE_U_3(pptr + 1)>>4, | |
1526 | ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); | |
1527 | ||
1528 | return 12 + (plen + 7) / 8; | |
c8cf0f94 PA |
1529 | } |
1530 | ||
ea7b4bf5 PA |
1531 | /* |
1532 | * bgp_attr_get_as_size | |
1533 | * | |
1534 | * Try to find the size of the ASs encoded in an as-path. It is not obvious, as | |
1535 | * both Old speakers that do not support 4 byte AS, and the new speakers that do | |
1536 | * support, exchange AS-Path with the same path-attribute type value 0x02. | |
1537 | */ | |
ed775ee7 | 1538 | static u_int |
411677ae | 1539 | bgp_attr_get_as_size(netdissect_options *ndo, |
ed775ee7 | 1540 | uint8_t bgpa_type, const u_char *pptr, u_int len) |
ea7b4bf5 PA |
1541 | { |
1542 | const u_char *tptr = pptr; | |
1543 | ||
1544 | /* | |
1545 | * If the path attribute is the optional AS4 path type, then we already | |
1546 | * know, that ASs must be encoded in 4 byte format. | |
1547 | */ | |
1548 | if (bgpa_type == BGPTYPE_AS4_PATH) { | |
1549 | return 4; | |
1550 | } | |
1551 | ||
1552 | /* | |
1553 | * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path | |
1554 | * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes | |
1555 | * each. | |
1556 | */ | |
1557 | while (tptr < pptr + len) { | |
ea7b4bf5 PA |
1558 | /* |
1559 | * If we do not find a valid segment type, our guess might be wrong. | |
1560 | */ | |
ed775ee7 | 1561 | if (GET_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || GET_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) { |
ea7b4bf5 PA |
1562 | goto trunc; |
1563 | } | |
ed775ee7 | 1564 | tptr += 2 + GET_U_1(tptr + 1) * 2; |
ea7b4bf5 PA |
1565 | } |
1566 | ||
1567 | /* | |
1568 | * If we correctly reached end of the AS path attribute data content, | |
1569 | * then most likely ASs were indeed encoded as 2 bytes. | |
1570 | */ | |
1571 | if (tptr == pptr + len) { | |
1572 | return 2; | |
1573 | } | |
1574 | ||
1575 | trunc: | |
1576 | ||
1577 | /* | |
1578 | * We can come here, either we did not have enough data, or if we | |
1579 | * try to decode 4 byte ASs in 2 byte format. Either way, return 4, | |
1580 | * so that calller can try to decode each AS as of 4 bytes. If indeed | |
1581 | * there was not enough data, it will crib and end the parse anyways. | |
1582 | */ | |
ed775ee7 | 1583 | return 4; |
ea7b4bf5 PA |
1584 | } |
1585 | ||
ed775ee7 AHJ |
1586 | /* |
1587 | * The only way to know that a BGP UPDATE message is using add path is | |
1588 | * by checking if the capability is in the OPEN message which we may have missed. | |
1589 | * So this function checks if it is possible that the update could contain add path | |
1590 | * and if so it checks that standard BGP doesn't make sense. | |
1591 | */ | |
c8cf0f94 | 1592 | static int |
ed775ee7 AHJ |
1593 | check_add_path(netdissect_options *ndo, const u_char *pptr, u_int length, |
1594 | u_int max_prefix_length) | |
c8cf0f94 | 1595 | { |
ed775ee7 AHJ |
1596 | u_int offset, prefix_length; |
1597 | ||
1598 | if (length < 5) { | |
1599 | return 0; | |
1600 | } | |
c8cf0f94 | 1601 | |
ed775ee7 AHJ |
1602 | /* |
1603 | * Scan through the NLRI information under the assumpetion that | |
1604 | * it doesn't have path IDs. | |
1605 | */ | |
1606 | for (offset = 0; offset < length;) { | |
1607 | offset += 4; | |
1608 | if (!ND_TTEST_1(pptr + offset)) { | |
1609 | /* We ran out of captured data; quit scanning. */ | |
1610 | break; | |
1611 | } | |
1612 | prefix_length = GET_U_1(pptr + offset); | |
ea7b4bf5 | 1613 | /* |
ed775ee7 AHJ |
1614 | * Add 4 to cover the path id |
1615 | * and check the prefix length isn't greater than 32/128. | |
ea7b4bf5 | 1616 | */ |
ed775ee7 AHJ |
1617 | if (prefix_length > max_prefix_length) { |
1618 | return 0; | |
1619 | } | |
1620 | /* Add 1 for the prefix_length byte and prefix_length to cover the address */ | |
1621 | offset += 1 + ((prefix_length + 7) / 8); | |
1622 | } | |
1623 | /* check we haven't gone past the end of the section */ | |
1624 | if (offset > length) { | |
1625 | return 0; | |
1626 | } | |
c8cf0f94 | 1627 | |
ed775ee7 AHJ |
1628 | /* check it's not standard BGP */ |
1629 | for (offset = 0; offset < length; ) { | |
1630 | if (!ND_TTEST_1(pptr + offset)) { | |
1631 | /* We ran out of captured data; quit scanning. */ | |
1632 | break; | |
1633 | } | |
1634 | prefix_length = GET_U_1(pptr + offset); | |
1635 | /* | |
1636 | * If the prefix_length is zero (0.0.0.0/0) | |
1637 | * and since it's not the only address (length >= 5) | |
1638 | * then it is add-path | |
1639 | */ | |
1640 | if (prefix_length < 1 || prefix_length > max_prefix_length) { | |
1641 | return 1; | |
1642 | } | |
1643 | offset += 1 + ((prefix_length + 7) / 8); | |
1644 | } | |
1645 | if (offset > length) { | |
1646 | return 1; | |
1647 | } | |
1648 | ||
1649 | /* assume not add-path by default */ | |
1650 | return 0; | |
1651 | } | |
1652 | ||
1653 | static int | |
1654 | bgp_mp_af_print(netdissect_options *ndo, | |
1655 | const u_char *tptr, u_int tlen, | |
1656 | uint16_t *afp, uint8_t *safip) | |
1657 | { | |
1658 | uint16_t af; | |
1659 | uint8_t safi; | |
1660 | ||
1661 | af = GET_BE_U_2(tptr); | |
1662 | *afp = af; | |
1663 | safi = GET_U_1(tptr + 2); | |
1664 | *safip = safi; | |
1665 | ||
1666 | ND_PRINT("\n\t AFI: %s (%u), %sSAFI: %s (%u)", | |
1667 | tok2str(af_values, "Unknown AFI", af), | |
1668 | af, | |
1669 | (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ | |
1670 | tok2str(bgp_safi_values, "Unknown SAFI", safi), | |
1671 | safi); | |
1672 | ||
1673 | switch(af<<8 | safi) { | |
1674 | case (AFNUM_INET<<8 | SAFNUM_UNICAST): | |
1675 | case (AFNUM_INET<<8 | SAFNUM_MULTICAST): | |
1676 | case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): | |
1677 | case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): | |
1678 | case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): | |
1679 | case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): | |
1680 | case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): | |
1681 | case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): | |
1682 | case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): | |
1683 | case (AFNUM_INET<<8 | SAFNUM_MDT): | |
1684 | case (AFNUM_INET6<<8 | SAFNUM_UNICAST): | |
1685 | case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): | |
1686 | case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): | |
1687 | case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): | |
1688 | case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): | |
1689 | case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): | |
1690 | case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): | |
1691 | case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): | |
1692 | case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): | |
1693 | case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): | |
1694 | case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): | |
1695 | case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): | |
1696 | case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): | |
1697 | case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): | |
1698 | case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): | |
1699 | case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): | |
1700 | case (AFNUM_VPLS<<8 | SAFNUM_VPLS): | |
1701 | break; | |
1702 | default: | |
1703 | ND_TCHECK_LEN(tptr, tlen); | |
1704 | ND_PRINT("\n\t no AFI %u / SAFI %u decoder", af, safi); | |
1705 | if (ndo->ndo_vflag <= 1) | |
1706 | print_unknown_data(ndo, tptr, "\n\t ", tlen); | |
1707 | return -1; | |
1708 | } | |
1709 | return 0; | |
1710 | trunc: | |
1711 | return -2; | |
1712 | } | |
1713 | ||
1714 | static int | |
1715 | bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi, | |
1716 | const u_char *tptr, u_int len, | |
1717 | char *buf, size_t buflen, | |
1718 | int add_path4, int add_path6) | |
1719 | { | |
1720 | int advance; | |
1721 | u_int path_id = 0; | |
1722 | ||
1723 | switch (af<<8 | safi) { | |
1724 | case (AFNUM_INET<<8 | SAFNUM_UNICAST): | |
1725 | case (AFNUM_INET<<8 | SAFNUM_MULTICAST): | |
1726 | case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): | |
1727 | if (add_path4) { | |
1728 | path_id = GET_BE_U_4(tptr); | |
1729 | tptr += 4; | |
27bfbee1 | 1730 | } |
ed775ee7 AHJ |
1731 | advance = decode_prefix4(ndo, tptr, len, buf, buflen); |
1732 | if (advance == -1) | |
1733 | ND_PRINT("\n\t (illegal prefix length)"); | |
1734 | else if (advance == -2) | |
1735 | break; /* bytes left, but not enough */ | |
1736 | else | |
1737 | ND_PRINT("\n\t %s", buf); | |
1738 | if (add_path4) { | |
1739 | ND_PRINT(" Path Id: %u", path_id); | |
1740 | advance += 4; | |
27bfbee1 PA |
1741 | } |
1742 | break; | |
ed775ee7 AHJ |
1743 | case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): |
1744 | advance = decode_labeled_prefix4(ndo, tptr, len, buf, buflen); | |
1745 | if (advance == -1) | |
1746 | ND_PRINT("\n\t (illegal prefix length)"); | |
1747 | else if (advance == -2) | |
1748 | goto trunc; | |
1749 | else if (advance == -3) | |
1750 | break; /* bytes left, but not enough */ | |
1751 | else | |
1752 | ND_PRINT("\n\t %s", buf); | |
c8cf0f94 | 1753 | break; |
ed775ee7 AHJ |
1754 | case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): |
1755 | case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): | |
1756 | case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): | |
1757 | advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, buflen); | |
1758 | if (advance == -1) | |
1759 | ND_PRINT("\n\t (illegal prefix length)"); | |
1760 | else | |
1761 | ND_PRINT("\n\t %s", buf); | |
1762 | break; | |
1763 | case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): | |
1764 | advance = decode_rt_routing_info(ndo, tptr); | |
1765 | break; | |
1766 | case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ | |
1767 | case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): | |
1768 | advance = decode_multicast_vpn(ndo, tptr, buf, buflen); | |
1769 | if (advance == -1) | |
1770 | ND_PRINT("\n\t (illegal prefix length)"); | |
1771 | else if (advance == -2) | |
1772 | goto trunc; | |
1773 | else | |
1774 | ND_PRINT("\n\t %s", buf); | |
c8cf0f94 | 1775 | break; |
c8cf0f94 | 1776 | |
ed775ee7 AHJ |
1777 | case (AFNUM_INET<<8 | SAFNUM_MDT): |
1778 | advance = decode_mdt_vpn_nlri(ndo, tptr, buf, buflen); | |
1779 | if (advance == -1) | |
1780 | ND_PRINT("\n\t (illegal prefix length)"); | |
1781 | else if (advance == -2) | |
1782 | goto trunc; | |
1783 | else | |
1784 | ND_PRINT("\n\t %s", buf); | |
1785 | break; | |
1786 | case (AFNUM_INET6<<8 | SAFNUM_UNICAST): | |
1787 | case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): | |
1788 | case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): | |
1789 | if (add_path6) { | |
1790 | path_id = GET_BE_U_4(tptr); | |
1791 | tptr += 4; | |
c8cf0f94 | 1792 | } |
ed775ee7 AHJ |
1793 | advance = decode_prefix6(ndo, tptr, len, buf, buflen); |
1794 | if (advance == -1) | |
1795 | ND_PRINT("\n\t (illegal prefix length)"); | |
1796 | else if (advance == -2) | |
1797 | break; /* bytes left, but not enough */ | |
1798 | else | |
1799 | ND_PRINT("\n\t %s", buf); | |
1800 | if (add_path6) { | |
1801 | ND_PRINT(" Path Id: %u", path_id); | |
1802 | advance += 4; | |
c8cf0f94 PA |
1803 | } |
1804 | break; | |
ed775ee7 AHJ |
1805 | case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): |
1806 | advance = decode_labeled_prefix6(ndo, tptr, len, buf, buflen); | |
1807 | if (advance == -1) | |
1808 | ND_PRINT("\n\t (illegal prefix length)"); | |
1809 | else if (advance == -2) | |
1810 | goto trunc; | |
1811 | else if (advance == -3) | |
1812 | break; /* bytes left, but not enough */ | |
1813 | else | |
1814 | ND_PRINT("\n\t %s", buf); | |
1815 | break; | |
1816 | case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): | |
1817 | case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): | |
1818 | case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): | |
1819 | advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, buflen); | |
1820 | if (advance == -1) | |
1821 | ND_PRINT("\n\t (illegal prefix length)"); | |
1822 | else | |
1823 | ND_PRINT("\n\t %s", buf); | |
1824 | break; | |
1825 | case (AFNUM_VPLS<<8 | SAFNUM_VPLS): | |
1826 | case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): | |
1827 | case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): | |
1828 | case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): | |
1829 | advance = decode_labeled_vpn_l2(ndo, tptr, buf, buflen); | |
1830 | if (advance == -1) | |
1831 | ND_PRINT("\n\t (illegal length)"); | |
1832 | else if (advance == -2) | |
1833 | goto trunc; | |
1834 | else | |
1835 | ND_PRINT("\n\t %s", buf); | |
1836 | break; | |
1837 | case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): | |
1838 | case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): | |
1839 | case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): | |
1840 | advance = decode_clnp_prefix(ndo, tptr, buf, buflen); | |
1841 | if (advance == -1) | |
1842 | ND_PRINT("\n\t (illegal prefix length)"); | |
1843 | else | |
1844 | ND_PRINT("\n\t %s", buf); | |
1845 | break; | |
1846 | case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): | |
1847 | case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): | |
1848 | case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): | |
1849 | advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, buflen); | |
1850 | if (advance == -1) | |
1851 | ND_PRINT("\n\t (illegal prefix length)"); | |
1852 | else | |
1853 | ND_PRINT("\n\t %s", buf); | |
1854 | break; | |
1855 | default: | |
1856 | /* | |
1857 | * This should not happen, we should have been protected | |
1858 | * by bgp_mp_af_print()'s return value. | |
1859 | */ | |
1860 | ND_PRINT("\n\t ERROR: no AFI %u / SAFI %u decoder", af, safi); | |
1861 | advance = -4; | |
1862 | break; | |
1863 | } | |
1864 | return advance; | |
1865 | trunc: /* we rely on the caller to recognize -2 return value */ | |
1866 | return -2; | |
1867 | } | |
c8cf0f94 | 1868 | |
ed775ee7 AHJ |
1869 | static int |
1870 | bgp_attr_print(netdissect_options *ndo, | |
1871 | uint8_t atype, const u_char *pptr, u_int len, | |
1872 | const unsigned attr_set_level) | |
1873 | { | |
1874 | /* allocate space for the largest possible string */ | |
1875 | char astostr[AS_STR_SIZE]; | |
1876 | u_int i; | |
1877 | uint16_t af; | |
1878 | uint8_t safi, snpa, nhlen; | |
1879 | int advance; | |
1880 | u_int tlen; | |
1881 | const u_char *tptr; | |
1882 | char buf[MAXHOSTNAMELEN + 100]; | |
1883 | u_int as_size; | |
1884 | int add_path4, add_path6; | |
1885 | int ret; | |
1886 | ||
1887 | tptr = pptr; | |
1888 | tlen = len; | |
1889 | ||
1890 | switch (atype) { | |
1891 | case BGPTYPE_ORIGIN: | |
1892 | if (len != 1) | |
1893 | ND_PRINT("invalid len"); | |
1894 | else { | |
1895 | ND_PRINT("%s", tok2str(bgp_origin_values, | |
1896 | "Unknown Origin Typecode", | |
1897 | GET_U_1(tptr))); | |
1898 | } | |
1899 | break; | |
1900 | ||
1901 | /* | |
1902 | * Process AS4 byte path and AS2 byte path attributes here. | |
1903 | */ | |
1904 | case BGPTYPE_AS4_PATH: | |
1905 | case BGPTYPE_AS_PATH: | |
1906 | if (len % 2) { | |
1907 | ND_PRINT("invalid len"); | |
1908 | break; | |
1909 | } | |
1910 | if (!len) { | |
1911 | ND_PRINT("empty"); | |
1912 | break; | |
1913 | } | |
1914 | ||
1915 | /* | |
1916 | * BGP updates exchanged between New speakers that support 4 | |
1917 | * byte AS, ASs are always encoded in 4 bytes. There is no | |
1918 | * definitive way to find this, just by the packet's | |
1919 | * contents. So, check for packet's TLV's sanity assuming | |
1920 | * 2 bytes first, and it does not pass, assume that ASs are | |
1921 | * encoded in 4 bytes format and move on. | |
1922 | */ | |
1923 | as_size = bgp_attr_get_as_size(ndo, atype, pptr, len); | |
1924 | ||
1925 | while (tptr < pptr + len) { | |
1926 | ND_PRINT("%s", tok2str(bgp_as_path_segment_open_values, | |
1927 | "?", GET_U_1(tptr))); | |
1928 | for (i = 0; i < GET_U_1(tptr + 1) * as_size; i += as_size) { | |
1929 | ND_TCHECK_LEN(tptr + 2 + i, as_size); | |
1930 | ND_PRINT("%s ", | |
1931 | as_printf(ndo, astostr, sizeof(astostr), | |
1932 | as_size == 2 ? | |
1933 | GET_BE_U_2(tptr + i + 2) : | |
1934 | GET_BE_U_4(tptr + i + 2))); | |
1935 | } | |
1936 | ND_PRINT("%s", tok2str(bgp_as_path_segment_close_values, | |
1937 | "?", GET_U_1(tptr))); | |
1938 | tptr += 2 + GET_U_1(tptr + 1) * as_size; | |
1939 | } | |
1940 | break; | |
1941 | case BGPTYPE_NEXT_HOP: | |
1942 | if (len != 4) | |
1943 | ND_PRINT("invalid len"); | |
1944 | else { | |
1945 | ND_PRINT("%s", GET_IPADDR_STRING(tptr)); | |
1946 | } | |
1947 | break; | |
1948 | case BGPTYPE_MULTI_EXIT_DISC: | |
1949 | case BGPTYPE_LOCAL_PREF: | |
1950 | if (len != 4) | |
1951 | ND_PRINT("invalid len"); | |
1952 | else { | |
1953 | ND_PRINT("%u", GET_BE_U_4(tptr)); | |
1954 | } | |
1955 | break; | |
1956 | case BGPTYPE_ATOMIC_AGGREGATE: | |
1957 | if (len != 0) | |
1958 | ND_PRINT("invalid len"); | |
1959 | break; | |
1960 | case BGPTYPE_AGGREGATOR: | |
1961 | ||
1962 | /* | |
1963 | * Depending on the AS encoded is of 2 bytes or of 4 bytes, | |
1964 | * the length of this PA can be either 6 bytes or 8 bytes. | |
1965 | */ | |
1966 | if (len != 6 && len != 8) { | |
1967 | ND_PRINT("invalid len"); | |
1968 | break; | |
1969 | } | |
1970 | ND_TCHECK_LEN(tptr, len); | |
1971 | if (len == 6) { | |
1972 | ND_PRINT(" AS #%s, origin %s", | |
1973 | as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(tptr)), | |
1974 | GET_IPADDR_STRING(tptr + 2)); | |
1975 | } else { | |
1976 | ND_PRINT(" AS #%s, origin %s", | |
1977 | as_printf(ndo, astostr, sizeof(astostr), | |
1978 | GET_BE_U_4(tptr)), GET_IPADDR_STRING(tptr + 4)); | |
1979 | } | |
1980 | break; | |
1981 | case BGPTYPE_AGGREGATOR4: | |
1982 | if (len != 8) { | |
1983 | ND_PRINT("invalid len"); | |
1984 | break; | |
1985 | } | |
1986 | ND_PRINT(" AS #%s, origin %s", | |
1987 | as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)), | |
1988 | GET_IPADDR_STRING(tptr + 4)); | |
1989 | break; | |
1990 | case BGPTYPE_COMMUNITIES: | |
1991 | if (len % 4) { | |
1992 | ND_PRINT("invalid len"); | |
1993 | break; | |
1994 | } | |
1995 | while (tlen != 0) { | |
1996 | uint32_t comm; | |
1997 | ND_TCHECK_4(tptr); | |
1998 | if (tlen < 4) | |
1999 | goto trunc; | |
2000 | comm = GET_BE_U_4(tptr); | |
2001 | switch (comm) { | |
2002 | case BGP_COMMUNITY_NO_EXPORT: | |
2003 | ND_PRINT(" NO_EXPORT"); | |
2004 | break; | |
2005 | case BGP_COMMUNITY_NO_ADVERT: | |
2006 | ND_PRINT(" NO_ADVERTISE"); | |
2007 | break; | |
2008 | case BGP_COMMUNITY_NO_EXPORT_SUBCONFED: | |
2009 | ND_PRINT(" NO_EXPORT_SUBCONFED"); | |
2010 | break; | |
2011 | default: | |
2012 | ND_PRINT("%u:%u%s", | |
2013 | (comm >> 16) & 0xffff, | |
2014 | comm & 0xffff, | |
2015 | (tlen>4) ? ", " : ""); | |
2016 | break; | |
2017 | } | |
2018 | tlen -=4; | |
2019 | tptr +=4; | |
2020 | } | |
2021 | break; | |
2022 | case BGPTYPE_ORIGINATOR_ID: | |
2023 | if (len != 4) { | |
2024 | ND_PRINT("invalid len"); | |
2025 | break; | |
2026 | } | |
2027 | ND_PRINT("%s",GET_IPADDR_STRING(tptr)); | |
2028 | break; | |
2029 | case BGPTYPE_CLUSTER_LIST: | |
2030 | if (len % 4) { | |
2031 | ND_PRINT("invalid len"); | |
2032 | break; | |
2033 | } | |
2034 | while (tlen != 0) { | |
2035 | if (tlen < 4) | |
2036 | goto trunc; | |
2037 | ND_PRINT("%s%s", | |
2038 | GET_IPADDR_STRING(tptr), | |
2039 | (tlen>4) ? ", " : ""); | |
2040 | tlen -=4; | |
2041 | tptr +=4; | |
2042 | } | |
2043 | break; | |
2044 | case BGPTYPE_MP_REACH_NLRI: | |
2045 | ND_TCHECK_3(tptr); | |
2046 | if (tlen < 3) | |
2047 | goto trunc; | |
2048 | ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi); | |
2049 | if (ret == -2) | |
2050 | goto trunc; | |
2051 | if (ret < 0) | |
2052 | break; | |
ea7b4bf5 | 2053 | |
ed775ee7 AHJ |
2054 | tptr += 3; |
2055 | tlen -= 3; | |
2056 | ||
2057 | ND_TCHECK_1(tptr); | |
2058 | if (tlen < 1) | |
2059 | goto trunc; | |
2060 | nhlen = GET_U_1(tptr); | |
2061 | tptr++; | |
2062 | tlen--; | |
2063 | ||
2064 | if (nhlen) { | |
2065 | u_int nnh = 0; | |
2066 | uint8_t tnhlen = nhlen; | |
2067 | if (tlen < tnhlen) | |
2068 | goto trunc; | |
2069 | ND_PRINT("\n\t nexthop: "); | |
2070 | while (tnhlen != 0) { | |
2071 | if (nnh++ > 0) { | |
2072 | ND_PRINT(", " ); | |
2073 | } | |
2074 | switch(af<<8 | safi) { | |
2075 | case (AFNUM_INET<<8 | SAFNUM_UNICAST): | |
2076 | case (AFNUM_INET<<8 | SAFNUM_MULTICAST): | |
2077 | case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): | |
2078 | case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): | |
2079 | case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): | |
2080 | case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): | |
2081 | case (AFNUM_INET<<8 | SAFNUM_MDT): | |
2082 | if (tnhlen < sizeof(nd_ipv4)) { | |
2083 | ND_PRINT("invalid len"); | |
2084 | tptr += tnhlen; | |
2085 | tlen -= tnhlen; | |
2086 | tnhlen = 0; | |
2087 | } else { | |
2088 | ND_PRINT("%s",GET_IPADDR_STRING(tptr)); | |
2089 | tptr += sizeof(nd_ipv4); | |
2090 | tnhlen -= sizeof(nd_ipv4); | |
2091 | tlen -= sizeof(nd_ipv4); | |
2092 | } | |
2093 | break; | |
2094 | case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): | |
2095 | case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): | |
2096 | case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): | |
2097 | if (tnhlen < sizeof(nd_ipv4)+BGP_VPN_RD_LEN) { | |
2098 | ND_PRINT("invalid len"); | |
2099 | tptr += tnhlen; | |
2100 | tlen -= tnhlen; | |
2101 | tnhlen = 0; | |
2102 | } else { | |
2103 | ND_PRINT("RD: %s, %s", | |
2104 | bgp_vpn_rd_print(ndo, tptr), | |
2105 | GET_IPADDR_STRING(tptr+BGP_VPN_RD_LEN)); | |
2106 | tptr += (sizeof(nd_ipv4)+BGP_VPN_RD_LEN); | |
2107 | tlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN); | |
2108 | tnhlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN); | |
2109 | } | |
ea7b4bf5 | 2110 | break; |
ed775ee7 AHJ |
2111 | case (AFNUM_INET6<<8 | SAFNUM_UNICAST): |
2112 | case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): | |
2113 | case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): | |
2114 | case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): | |
2115 | if (tnhlen < sizeof(nd_ipv6)) { | |
2116 | ND_PRINT("invalid len"); | |
2117 | tptr += tnhlen; | |
2118 | tlen -= tnhlen; | |
2119 | tnhlen = 0; | |
2120 | } else { | |
2121 | ND_PRINT("%s", GET_IP6ADDR_STRING(tptr)); | |
2122 | tptr += sizeof(nd_ipv6); | |
2123 | tlen -= sizeof(nd_ipv6); | |
2124 | tnhlen -= sizeof(nd_ipv6); | |
2125 | } | |
2126 | break; | |
2127 | case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): | |
2128 | case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): | |
2129 | case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): | |
2130 | if (tnhlen < sizeof(nd_ipv6)+BGP_VPN_RD_LEN) { | |
2131 | ND_PRINT("invalid len"); | |
2132 | tptr += tnhlen; | |
2133 | tlen -= tnhlen; | |
2134 | tnhlen = 0; | |
2135 | } else { | |
2136 | ND_PRINT("RD: %s, %s", | |
2137 | bgp_vpn_rd_print(ndo, tptr), | |
2138 | GET_IP6ADDR_STRING(tptr+BGP_VPN_RD_LEN)); | |
2139 | tptr += (sizeof(nd_ipv6)+BGP_VPN_RD_LEN); | |
2140 | tlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN); | |
2141 | tnhlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN); | |
2142 | } | |
ea7b4bf5 | 2143 | break; |
ed775ee7 AHJ |
2144 | case (AFNUM_VPLS<<8 | SAFNUM_VPLS): |
2145 | case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): | |
2146 | case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): | |
2147 | case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): | |
2148 | if (tnhlen < sizeof(nd_ipv4)) { | |
2149 | ND_PRINT("invalid len"); | |
2150 | tptr += tnhlen; | |
2151 | tlen -= tnhlen; | |
2152 | tnhlen = 0; | |
2153 | } else { | |
2154 | ND_PRINT("%s", GET_IPADDR_STRING(tptr)); | |
2155 | tptr += (sizeof(nd_ipv4)); | |
2156 | tlen -= (sizeof(nd_ipv4)); | |
2157 | tnhlen -= (sizeof(nd_ipv4)); | |
2158 | } | |
ea7b4bf5 | 2159 | break; |
ed775ee7 AHJ |
2160 | case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): |
2161 | case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): | |
2162 | case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): | |
2163 | ND_PRINT("%s", GET_ISONSAP_STRING(tptr, tnhlen)); | |
2164 | tptr += tnhlen; | |
2165 | tlen -= tnhlen; | |
2166 | tnhlen = 0; | |
ea7b4bf5 | 2167 | break; |
ed775ee7 AHJ |
2168 | |
2169 | case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): | |
2170 | case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): | |
2171 | case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): | |
2172 | if (tnhlen < BGP_VPN_RD_LEN+1) { | |
2173 | ND_PRINT("invalid len"); | |
2174 | tptr += tnhlen; | |
2175 | tlen -= tnhlen; | |
2176 | tnhlen = 0; | |
2177 | } else { | |
2178 | ND_TCHECK_LEN(tptr, tnhlen); | |
2179 | ND_PRINT("RD: %s, %s", | |
2180 | bgp_vpn_rd_print(ndo, tptr), | |
2181 | GET_ISONSAP_STRING(tptr+BGP_VPN_RD_LEN,tnhlen-BGP_VPN_RD_LEN)); | |
2182 | /* rfc986 mapped IPv4 address ? */ | |
2183 | if (GET_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601) | |
2184 | ND_PRINT(" = %s", GET_IPADDR_STRING(tptr+BGP_VPN_RD_LEN+4)); | |
2185 | /* rfc1888 mapped IPv6 address ? */ | |
2186 | else if (GET_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000) | |
2187 | ND_PRINT(" = %s", GET_IP6ADDR_STRING(tptr+BGP_VPN_RD_LEN+3)); | |
2188 | tptr += tnhlen; | |
2189 | tlen -= tnhlen; | |
2190 | tnhlen = 0; | |
ea7b4bf5 | 2191 | } |
ed775ee7 AHJ |
2192 | break; |
2193 | default: | |
2194 | /* | |
2195 | * bgp_mp_af_print() should have saved us from | |
2196 | * an unsupported AFI/SAFI. | |
2197 | */ | |
2198 | ND_PRINT("ERROR: no AFI %u/SAFI %u nexthop decoder", af, safi); | |
2199 | tptr += tnhlen; | |
2200 | tlen -= tnhlen; | |
2201 | tnhlen = 0; | |
2202 | goto done; | |
2203 | break; | |
ea7b4bf5 | 2204 | } |
ed775ee7 AHJ |
2205 | } |
2206 | } | |
2207 | ND_PRINT(", nh-length: %u", nhlen); | |
2208 | ||
2209 | /* As per RFC 2858; this is reserved in RFC 4760 */ | |
2210 | if (tlen < 1) | |
2211 | goto trunc; | |
2212 | snpa = GET_U_1(tptr); | |
2213 | tptr++; | |
2214 | tlen--; | |
2215 | ||
2216 | if (snpa) { | |
2217 | ND_PRINT("\n\t %u SNPA", snpa); | |
2218 | for (/*nothing*/; snpa != 0; snpa--) { | |
2219 | uint8_t snpalen; | |
2220 | if (tlen < 1) | |
2221 | goto trunc; | |
2222 | snpalen = GET_U_1(tptr); | |
2223 | ND_PRINT("\n\t %u bytes", snpalen); | |
2224 | tptr++; | |
2225 | tlen--; | |
2226 | if (tlen < snpalen) | |
2227 | goto trunc; | |
2228 | ND_TCHECK_LEN(tptr, snpalen); | |
2229 | tptr += snpalen; | |
2230 | tlen -= snpalen; | |
2231 | } | |
2232 | } else { | |
2233 | ND_PRINT(", no SNPA"); | |
2234 | } | |
2235 | ||
2236 | add_path4 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 32); | |
2237 | add_path6 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 128); | |
2238 | ||
2239 | while (tptr < pptr + len) { | |
2240 | advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf), | |
2241 | add_path4, add_path6); | |
2242 | if (advance == -2) | |
2243 | goto trunc; | |
2244 | if (advance < 0) | |
2245 | break; | |
2246 | tptr += advance; | |
2247 | } | |
2248 | break; | |
2249 | ||
2250 | case BGPTYPE_MP_UNREACH_NLRI: | |
2251 | ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE); | |
2252 | ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi); | |
2253 | if (ret == -2) | |
2254 | goto trunc; | |
2255 | if (ret < 0) | |
2256 | break; | |
2257 | ||
2258 | if (len == BGP_MP_NLRI_MINSIZE) | |
2259 | ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)"); | |
2260 | ||
2261 | tptr += 3; | |
2262 | ||
2263 | add_path4 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 32); | |
2264 | add_path6 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 128); | |
2265 | ||
2266 | while (tptr < pptr + len) { | |
2267 | advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf), | |
2268 | add_path4, add_path6); | |
2269 | if (advance == -2) | |
2270 | goto trunc; | |
2271 | if (advance < 0) | |
ea7b4bf5 | 2272 | break; |
ed775ee7 AHJ |
2273 | tptr += advance; |
2274 | } | |
2275 | break; | |
2276 | case BGPTYPE_EXTD_COMMUNITIES: | |
2277 | if (len % 8) { | |
2278 | ND_PRINT("invalid len"); | |
2279 | break; | |
2280 | } | |
2281 | while (tlen != 0) { | |
2282 | uint16_t extd_comm; | |
2283 | ||
2284 | ND_TCHECK_2(tptr); | |
2285 | if (tlen < 2) | |
2286 | goto trunc; | |
2287 | extd_comm=GET_BE_U_2(tptr); | |
2288 | ||
2289 | ND_PRINT("\n\t %s (0x%04x), Flags [%s]", | |
2290 | tok2str(bgp_extd_comm_subtype_values, | |
2291 | "unknown extd community typecode", | |
2292 | extd_comm), | |
2293 | extd_comm, | |
2294 | bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)); | |
2295 | ||
2296 | ND_TCHECK_8(tptr); | |
2297 | if (tlen < 8) | |
2298 | goto trunc; | |
2299 | ND_PRINT(": "); | |
2300 | bgp_extended_community_print(ndo, tptr); | |
2301 | tlen -= 8; | |
2302 | tptr += 8; | |
ea7b4bf5 | 2303 | } |
ed775ee7 | 2304 | break; |
411677ae | 2305 | |
ed775ee7 AHJ |
2306 | case BGPTYPE_PMSI_TUNNEL: |
2307 | { | |
2308 | uint8_t tunnel_type, flags; | |
411677ae | 2309 | |
ed775ee7 AHJ |
2310 | ND_TCHECK_5(tptr); |
2311 | if (tlen < 5) | |
2312 | goto trunc; | |
2313 | flags = GET_U_1(tptr); | |
2314 | tunnel_type = GET_U_1(tptr + 1); | |
2315 | ||
2316 | ND_PRINT("\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u", | |
2317 | tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type), | |
2318 | tunnel_type, | |
2319 | bittok2str(bgp_pmsi_flag_values, "none", flags), | |
2320 | GET_BE_U_3(tptr + 2)>>4); | |
2321 | ||
2322 | tptr +=5; | |
2323 | tlen -= 5; | |
2324 | ||
2325 | switch (tunnel_type) { | |
2326 | case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */ | |
2327 | case BGP_PMSI_TUNNEL_PIM_BIDIR: | |
2328 | ND_PRINT("\n\t Sender %s, P-Group %s", | |
2329 | GET_IPADDR_STRING(tptr), | |
2330 | GET_IPADDR_STRING(tptr+4)); | |
2331 | break; | |
411677ae | 2332 | |
ed775ee7 AHJ |
2333 | case BGP_PMSI_TUNNEL_PIM_SSM: |
2334 | ND_PRINT("\n\t Root-Node %s, P-Group %s", | |
2335 | GET_IPADDR_STRING(tptr), | |
2336 | GET_IPADDR_STRING(tptr+4)); | |
2337 | break; | |
2338 | case BGP_PMSI_TUNNEL_INGRESS: | |
2339 | ND_PRINT("\n\t Tunnel-Endpoint %s", | |
2340 | GET_IPADDR_STRING(tptr)); | |
2341 | break; | |
2342 | case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */ | |
2343 | case BGP_PMSI_TUNNEL_LDP_MP2MP: | |
2344 | ND_PRINT("\n\t Root-Node %s, LSP-ID 0x%08x", | |
2345 | GET_IPADDR_STRING(tptr), | |
2346 | GET_BE_U_4(tptr + 4)); | |
2347 | break; | |
2348 | case BGP_PMSI_TUNNEL_RSVP_P2MP: | |
2349 | ND_PRINT("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x", | |
2350 | GET_IPADDR_STRING(tptr), | |
2351 | GET_BE_U_4(tptr + 4)); | |
2352 | break; | |
2353 | default: | |
2354 | if (ndo->ndo_vflag <= 1) { | |
2355 | print_unknown_data(ndo, tptr, "\n\t ", tlen); | |
2356 | } | |
2357 | } | |
2358 | break; | |
2359 | } | |
2360 | case BGPTYPE_AIGP: | |
2361 | { | |
2362 | uint8_t type; | |
2363 | uint16_t length; | |
411677ae | 2364 | |
ed775ee7 AHJ |
2365 | while (tlen >= 3) { |
2366 | type = GET_U_1(tptr); | |
2367 | length = GET_BE_U_2(tptr + 1); | |
2368 | tptr += 3; | |
2369 | tlen -= 3; | |
411677ae | 2370 | |
ed775ee7 AHJ |
2371 | ND_PRINT("\n\t %s TLV (%u), length %u", |
2372 | tok2str(bgp_aigp_values, "Unknown", type), | |
2373 | type, length); | |
411677ae | 2374 | |
ed775ee7 AHJ |
2375 | if (length < 3) |
2376 | goto trunc; | |
2377 | length -= 3; | |
411677ae | 2378 | |
ed775ee7 AHJ |
2379 | /* |
2380 | * Check if we can read the TLV data. | |
2381 | */ | |
2382 | ND_TCHECK_LEN(tptr + 3, length); | |
2383 | if (tlen < length) | |
2384 | goto trunc; | |
2385 | ||
2386 | switch (type) { | |
2387 | ||
2388 | case BGP_AIGP_TLV: | |
2389 | if (length < 8) | |
2390 | goto trunc; | |
2391 | ND_PRINT(", metric %" PRIu64, | |
2392 | GET_BE_U_8(tptr)); | |
c8cf0f94 | 2393 | break; |
c8cf0f94 | 2394 | |
ed775ee7 AHJ |
2395 | default: |
2396 | if (ndo->ndo_vflag <= 1) { | |
2397 | print_unknown_data(ndo, tptr,"\n\t ", length); | |
2398 | } | |
2399 | } | |
2400 | ||
2401 | tptr += length; | |
2402 | tlen -= length; | |
2403 | } | |
2404 | break; | |
2405 | } | |
2406 | case BGPTYPE_ATTR_SET: | |
2407 | ND_TCHECK_4(tptr); | |
2408 | if (len < 4) | |
2409 | goto trunc; | |
2410 | ND_PRINT("\n\t Origin AS: %s", | |
2411 | as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr))); | |
2412 | tptr += 4; | |
2413 | len -= 4; | |
2414 | ||
2415 | while (len) { | |
2416 | u_int aflags, alenlen, alen; | |
2417 | ||
2418 | ND_TCHECK_2(tptr); | |
2419 | if (len < 2) { | |
2420 | ND_PRINT(" [path attr too short]"); | |
2421 | tptr += len; | |
2422 | break; | |
2423 | } | |
2424 | aflags = GET_U_1(tptr); | |
2425 | atype = GET_U_1(tptr + 1); | |
2426 | tptr += 2; | |
2427 | len -= 2; | |
2428 | alenlen = bgp_attr_lenlen(aflags, tptr); | |
2429 | ND_TCHECK_LEN(tptr, alenlen); | |
2430 | if (len < alenlen) { | |
2431 | ND_PRINT(" [path attr too short]"); | |
2432 | tptr += len; | |
2433 | break; | |
2434 | } | |
2435 | alen = bgp_attr_len(aflags, tptr); | |
2436 | tptr += alenlen; | |
2437 | len -= alenlen; | |
2438 | ||
2439 | ND_PRINT("\n\t %s (%u), length: %u", | |
2440 | tok2str(bgp_attr_values, | |
2441 | "Unknown Attribute", atype), | |
2442 | atype, | |
2443 | alen); | |
2444 | ||
2445 | if (aflags) { | |
2446 | ND_PRINT(", Flags [%s%s%s%s", | |
2447 | aflags & 0x80 ? "O" : "", | |
2448 | aflags & 0x40 ? "T" : "", | |
2449 | aflags & 0x20 ? "P" : "", | |
2450 | aflags & 0x10 ? "E" : ""); | |
2451 | if (aflags & 0xf) | |
2452 | ND_PRINT("+%x", aflags & 0xf); | |
2453 | ND_PRINT("]"); | |
2454 | } | |
2455 | ND_PRINT(": "); | |
2456 | if (len < alen) { | |
2457 | ND_PRINT(" [path attr too short]"); | |
2458 | tptr += len; | |
2459 | break; | |
2460 | } | |
2461 | /* | |
2462 | * The protocol encoding per se allows ATTR_SET to be nested | |
2463 | * as many times as the message can accommodate. This printer | |
2464 | * used to be able to recurse into ATTR_SET contents until the | |
2465 | * stack exhaustion, but now there is a limit on that (if live | |
2466 | * protocol exchange goes that many levels deep, something is | |
2467 | * probably wrong anyway). Feel free to refine this value if | |
2468 | * you can find the spec with respective normative text. | |
2469 | */ | |
2470 | if (attr_set_level == 10) | |
2471 | ND_PRINT("(too many nested levels, not recursing)"); | |
2472 | else if (!bgp_attr_print(ndo, atype, tptr, alen, attr_set_level + 1)) | |
2473 | return 0; | |
2474 | tptr += alen; | |
2475 | len -= alen; | |
2476 | } | |
2477 | break; | |
2478 | ||
2479 | case BGPTYPE_LARGE_COMMUNITY: | |
2480 | if (len == 0 || len % 12) { | |
2481 | ND_PRINT("invalid len"); | |
c8cf0f94 | 2482 | break; |
c8cf0f94 | 2483 | } |
ed775ee7 AHJ |
2484 | ND_PRINT("\n\t "); |
2485 | while (len != 0) { | |
2486 | ND_PRINT("%u:%u:%u%s", | |
2487 | GET_BE_U_4(tptr), | |
2488 | GET_BE_U_4(tptr + 4), | |
2489 | GET_BE_U_4(tptr + 8), | |
2490 | (len > 12) ? ", " : ""); | |
2491 | tptr += 12; | |
2492 | /* | |
2493 | * len will always be a multiple of 12, as per the above, | |
2494 | * so this will never underflow. | |
2495 | */ | |
2496 | len -= 12; | |
2497 | } | |
2498 | break; | |
2499 | default: | |
2500 | ND_TCHECK_LEN(pptr, len); | |
2501 | ND_PRINT("\n\t no Attribute %u decoder", atype); /* we have no decoder for the attribute */ | |
2502 | if (ndo->ndo_vflag <= 1) | |
2503 | print_unknown_data(ndo, pptr, "\n\t ", len); | |
2504 | break; | |
2505 | } | |
2506 | done: | |
2507 | if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/ | |
2508 | ND_TCHECK_LEN(pptr, len); | |
2509 | print_unknown_data(ndo, pptr, "\n\t ", len); | |
2510 | } | |
2511 | return 1; | |
c8cf0f94 PA |
2512 | |
2513 | trunc: | |
ed775ee7 | 2514 | return 0; |
c8cf0f94 PA |
2515 | } |
2516 | ||
6263709f | 2517 | static void |
411677ae | 2518 | bgp_capabilities_print(netdissect_options *ndo, |
ed775ee7 | 2519 | const u_char *opt, u_int caps_len) |
6263709f | 2520 | { |
ed775ee7 AHJ |
2521 | /* allocate space for the largest possible string */ |
2522 | char astostr[AS_STR_SIZE]; | |
2523 | u_int cap_type, cap_len, tcap_len, cap_offset; | |
2524 | u_int i = 0; | |
2525 | ||
2526 | while (i < caps_len) { | |
2527 | ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE); | |
2528 | cap_type=GET_U_1(opt + i); | |
2529 | cap_len=GET_U_1(opt + i + 1); | |
2530 | ND_PRINT("\n\t %s (%u), length: %u", | |
2531 | tok2str(bgp_capcode_values, "Unknown", cap_type), | |
2532 | cap_type, | |
2533 | cap_len); | |
2534 | ND_TCHECK_LEN(opt + 2 + i, cap_len); | |
2535 | switch (cap_type) { | |
2536 | case BGP_CAPCODE_MP: | |
2537 | /* AFI (16 bits), Reserved (8 bits), SAFI (8 bits) */ | |
2538 | if (cap_len < 4) { | |
2539 | ND_PRINT(" (too short, < 4)"); | |
2540 | return; | |
2541 | } | |
2542 | ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u)", | |
2543 | tok2str(af_values, "Unknown", GET_BE_U_2(opt + i + 2)), | |
2544 | GET_BE_U_2(opt + i + 2), | |
2545 | tok2str(bgp_safi_values, "Unknown", GET_U_1(opt + i + 5)), | |
2546 | GET_U_1(opt + i + 5)); | |
2547 | break; | |
2548 | case BGP_CAPCODE_ML: | |
2549 | cap_offset = 2; | |
2550 | tcap_len = cap_len; | |
2551 | while (tcap_len >= 4) { | |
2552 | ND_PRINT( "\n\t\tAFI %s (%u), SAFI %s (%u), Count: %u", | |
2553 | tok2str(af_values, "Unknown", | |
2554 | GET_BE_U_2(opt + i + cap_offset)), | |
2555 | GET_BE_U_2(opt + i + cap_offset), | |
2556 | tok2str(bgp_safi_values, "Unknown", | |
2557 | GET_U_1(opt + i + cap_offset + 2)), | |
2558 | GET_U_1(opt + i + cap_offset + 2), | |
2559 | GET_U_1(opt + i + cap_offset + 3)); | |
2560 | tcap_len -= 4; | |
2561 | cap_offset += 4; | |
2562 | } | |
2563 | break; | |
2564 | case BGP_CAPCODE_RESTART: | |
2565 | /* Restart Flags (4 bits), Restart Time in seconds (12 bits) */ | |
2566 | if (cap_len < 2) { | |
2567 | ND_PRINT(" (too short, < 2)"); | |
2568 | return; | |
2569 | } | |
2570 | tcap_len=cap_len; | |
2571 | ND_PRINT("\n\t\tRestart Flags: [%s], Restart Time %us", | |
2572 | ((GET_U_1(opt + i + 2))&0x80) ? "R" : "none", | |
2573 | GET_BE_U_2(opt + i + 2)&0xfff); | |
2574 | tcap_len-=2; | |
2575 | cap_offset=4; | |
2576 | while(tcap_len>=4) { | |
2577 | ND_PRINT("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s", | |
2578 | tok2str(af_values,"Unknown", | |
2579 | GET_BE_U_2(opt + i + cap_offset)), | |
2580 | GET_BE_U_2(opt + i + cap_offset), | |
2581 | tok2str(bgp_safi_values,"Unknown", | |
2582 | GET_U_1(opt + i + cap_offset + 2)), | |
2583 | GET_U_1(opt + (i + cap_offset + 2)), | |
2584 | ((GET_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" ); | |
2585 | tcap_len -= 4; | |
2586 | cap_offset += 4; | |
2587 | } | |
2588 | break; | |
2589 | case BGP_CAPCODE_RR: | |
2590 | case BGP_CAPCODE_LLGR: | |
2591 | case BGP_CAPCODE_RR_CISCO: | |
2592 | break; | |
2593 | case BGP_CAPCODE_AS_NEW: | |
2594 | /* | |
2595 | * Extract the 4 byte AS number encoded. | |
2596 | */ | |
2597 | if (cap_len < 4) { | |
2598 | ND_PRINT(" (too short, < 4)"); | |
2599 | return; | |
2600 | } | |
2601 | ND_PRINT("\n\t\t 4 Byte AS %s", | |
2602 | as_printf(ndo, astostr, sizeof(astostr), | |
2603 | GET_BE_U_4(opt + i + 2))); | |
2604 | break; | |
2605 | case BGP_CAPCODE_ADD_PATH: | |
2606 | if (cap_len == 0) { | |
2607 | ND_PRINT(" (bogus)"); /* length */ | |
2608 | break; | |
2609 | } | |
2610 | tcap_len=cap_len; | |
2611 | cap_offset=2; | |
2612 | while (tcap_len != 0) { | |
2613 | if (tcap_len < 4) { | |
2614 | nd_print_invalid(ndo); | |
6263709f PA |
2615 | break; |
2616 | } | |
ed775ee7 AHJ |
2617 | ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s", |
2618 | tok2str(af_values,"Unknown",GET_BE_U_2(opt + i + cap_offset)), | |
2619 | GET_BE_U_2(opt + i + cap_offset), | |
2620 | tok2str(bgp_safi_values,"Unknown",GET_U_1(opt + i + cap_offset + 2)), | |
2621 | GET_U_1(opt + (i + cap_offset + 2)), | |
2622 | tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",GET_U_1(opt + i + cap_offset + 3)) | |
2623 | ); | |
2624 | tcap_len -= 4; | |
2625 | cap_offset += 4; | |
2626 | } | |
2627 | break; | |
2628 | default: | |
2629 | ND_PRINT("\n\t\tno decoder for Capability %u", | |
2630 | cap_type); | |
2631 | if (ndo->ndo_vflag <= 1) | |
2632 | print_unknown_data(ndo, opt + i + 2, "\n\t\t", | |
2633 | cap_len); | |
2634 | break; | |
6263709f | 2635 | } |
ed775ee7 AHJ |
2636 | if (ndo->ndo_vflag > 1 && cap_len != 0) { |
2637 | print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len); | |
2638 | } | |
2639 | i += BGP_CAP_HEADER_SIZE + cap_len; | |
2640 | } | |
2641 | return; | |
6263709f PA |
2642 | |
2643 | trunc: | |
ed775ee7 | 2644 | nd_print_trunc(ndo); |
6263709f PA |
2645 | } |
2646 | ||
c8cf0f94 | 2647 | static void |
411677ae | 2648 | bgp_open_print(netdissect_options *ndo, |
ed775ee7 | 2649 | const u_char *dat, u_int length) |
c8cf0f94 | 2650 | { |
ed775ee7 AHJ |
2651 | /* allocate space for the largest possible string */ |
2652 | char astostr[AS_STR_SIZE]; | |
2653 | const struct bgp_open *bgp_open_header; | |
2654 | u_int optslen; | |
2655 | const struct bgp_opt *bgpopt; | |
2656 | const u_char *opt; | |
2657 | u_int i; | |
2658 | ||
2659 | ND_TCHECK_LEN(dat, BGP_OPEN_SIZE); | |
2660 | if (length < BGP_OPEN_SIZE) | |
2661 | goto trunc; | |
2662 | ||
2663 | bgp_open_header = (const struct bgp_open *)dat; | |
2664 | ||
2665 | ND_PRINT("\n\t Version %u, ", | |
2666 | GET_U_1(bgp_open_header->bgpo_version)); | |
2667 | ND_PRINT("my AS %s, ", | |
2668 | as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(bgp_open_header->bgpo_myas))); | |
2669 | ND_PRINT("Holdtime %us, ", | |
2670 | GET_BE_U_2(bgp_open_header->bgpo_holdtime)); | |
2671 | ND_PRINT("ID %s", GET_IPADDR_STRING(bgp_open_header->bgpo_id)); | |
2672 | optslen = GET_U_1(bgp_open_header->bgpo_optlen); | |
2673 | ND_PRINT("\n\t Optional parameters, length: %u", optslen); | |
2674 | ||
2675 | opt = dat + BGP_OPEN_SIZE; | |
2676 | length -= BGP_OPEN_SIZE; | |
2677 | ||
2678 | i = 0; | |
2679 | while (i < optslen) { | |
2680 | uint8_t opt_type, opt_len; | |
2681 | ||
2682 | ND_TCHECK_LEN(opt + i, BGP_OPT_SIZE); | |
2683 | if (length < BGP_OPT_SIZE + i) | |
2684 | goto trunc; | |
2685 | bgpopt = (const struct bgp_opt *)(opt + i); | |
2686 | opt_type = GET_U_1(bgpopt->bgpopt_type); | |
2687 | opt_len = GET_U_1(bgpopt->bgpopt_len); | |
2688 | if (BGP_OPT_SIZE + i + opt_len > optslen) { | |
2689 | ND_PRINT("\n\t Option %u, length: %u, goes past the end of the options", | |
2690 | opt_type, opt_len); | |
2691 | break; | |
2692 | } | |
2693 | ||
2694 | ND_PRINT("\n\t Option %s (%u), length: %u", | |
2695 | tok2str(bgp_opt_values,"Unknown",opt_type), | |
2696 | opt_type, | |
2697 | opt_len); | |
2698 | ||
2699 | /* now let's decode the options we know*/ | |
2700 | switch(opt_type) { | |
2701 | ||
2702 | case BGP_OPT_CAP: | |
2703 | bgp_capabilities_print(ndo, opt + BGP_OPT_SIZE + i, | |
2704 | opt_len); | |
2705 | break; | |
2706 | ||
2707 | case BGP_OPT_AUTH: | |
2708 | default: | |
2709 | ND_PRINT("\n\t no decoder for option %u", | |
2710 | opt_type); | |
2711 | break; | |
2712 | } | |
2713 | i += BGP_OPT_SIZE + opt_len; | |
2714 | } | |
2715 | return; | |
c8cf0f94 | 2716 | trunc: |
ed775ee7 | 2717 | nd_print_trunc(ndo); |
c8cf0f94 PA |
2718 | } |
2719 | ||
2720 | static void | |
411677ae | 2721 | bgp_update_print(netdissect_options *ndo, |
ed775ee7 | 2722 | const u_char *dat, u_int length) |
c8cf0f94 | 2723 | { |
ed775ee7 AHJ |
2724 | const u_char *p; |
2725 | u_int withdrawn_routes_len; | |
2726 | char buf[MAXHOSTNAMELEN + 100]; | |
2727 | int wpfx; | |
2728 | u_int len; | |
2729 | int i; | |
2730 | int add_path; | |
2731 | u_int path_id = 0; | |
2732 | ||
2733 | ND_TCHECK_LEN(dat, BGP_SIZE); | |
2734 | if (length < BGP_SIZE) | |
2735 | goto trunc; | |
2736 | p = dat + BGP_SIZE; | |
2737 | length -= BGP_SIZE; | |
2738 | ||
2739 | /* Unfeasible routes */ | |
2740 | ND_TCHECK_2(p); | |
2741 | if (length < 2) | |
2742 | goto trunc; | |
2743 | withdrawn_routes_len = GET_BE_U_2(p); | |
2744 | p += 2; | |
2745 | length -= 2; | |
2746 | if (withdrawn_routes_len > 1) { | |
2747 | /* | |
2748 | * Without keeping state from the original NLRI message, | |
2749 | * it's not possible to tell if this a v4 or v6 route, | |
2750 | * so only try to decode it if we're not v6 enabled. | |
2751 | */ | |
2752 | ND_TCHECK_LEN(p, withdrawn_routes_len); | |
2753 | if (length < withdrawn_routes_len) | |
2754 | goto trunc; | |
2755 | ND_PRINT("\n\t Withdrawn routes:"); | |
2756 | add_path = check_add_path(ndo, p, withdrawn_routes_len, 32); | |
2757 | while (withdrawn_routes_len != 0) { | |
2758 | if (add_path) { | |
2759 | if (withdrawn_routes_len < 4) { | |
2760 | p += withdrawn_routes_len; | |
2761 | length -= withdrawn_routes_len; | |
2762 | break; | |
2763 | } | |
2764 | path_id = GET_BE_U_4(p); | |
2765 | p += 4; | |
2766 | length -= 4; | |
2767 | withdrawn_routes_len -= 4; | |
2768 | } | |
2769 | wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf)); | |
2770 | if (wpfx == -1) { | |
2771 | ND_PRINT("\n\t (illegal prefix length)"); | |
2772 | break; | |
2773 | } else if (wpfx == -2) | |
2774 | goto trunc; /* bytes left, but not enough */ | |
2775 | else { | |
2776 | ND_PRINT("\n\t %s", buf); | |
2777 | if (add_path) { | |
2778 | ND_PRINT(" Path Id: %u", path_id); | |
2779 | } | |
2780 | p += wpfx; | |
2781 | length -= wpfx; | |
2782 | withdrawn_routes_len -= wpfx; | |
2783 | } | |
c8cf0f94 | 2784 | } |
ed775ee7 AHJ |
2785 | } else { |
2786 | ND_TCHECK_LEN(p, withdrawn_routes_len); | |
2787 | if (length < withdrawn_routes_len) | |
2788 | goto trunc; | |
2789 | p += withdrawn_routes_len; | |
2790 | length -= withdrawn_routes_len; | |
2791 | } | |
c8cf0f94 | 2792 | |
ed775ee7 AHJ |
2793 | ND_TCHECK_2(p); |
2794 | if (length < 2) | |
2795 | goto trunc; | |
2796 | len = GET_BE_U_2(p); | |
2797 | p += 2; | |
2798 | length -= 2; | |
c8cf0f94 | 2799 | |
ed775ee7 AHJ |
2800 | if (withdrawn_routes_len == 0 && len == 0 && length == 0) { |
2801 | /* No withdrawn routes, no path attributes, no NLRI */ | |
2802 | ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)"); | |
2803 | return; | |
2804 | } | |
2805 | ||
2806 | if (len) { | |
2807 | /* do something more useful!*/ | |
2808 | while (len) { | |
2809 | uint8_t aflags, atype, alenlen; | |
2810 | uint16_t alen; | |
2811 | ||
2812 | ND_TCHECK_2(p); | |
2813 | if (length < 2) | |
2814 | goto trunc; | |
2815 | if (len < 2) { | |
2816 | ND_PRINT("\n\t [path attrs too short]"); | |
2817 | p += len; | |
2818 | length -= len; | |
2819 | break; | |
2820 | } | |
2821 | aflags = GET_U_1(p); | |
2822 | atype = GET_U_1(p + 1); | |
2823 | p += 2; | |
2824 | len -= 2; | |
2825 | length -= 2; | |
2826 | alenlen = bgp_attr_lenlen(aflags, p); | |
2827 | ND_TCHECK_LEN(p, alenlen); | |
2828 | if (length < alenlen) | |
2829 | goto trunc; | |
2830 | if (len < alenlen) { | |
2831 | ND_PRINT("\n\t [path attrs too short]"); | |
2832 | p += len; | |
2833 | length -= len; | |
2834 | break; | |
2835 | } | |
2836 | alen = bgp_attr_len(aflags, p); | |
2837 | p += alenlen; | |
2838 | len -= alenlen; | |
2839 | length -= alenlen; | |
2840 | ||
2841 | ND_PRINT("\n\t %s (%u), length: %u", | |
2842 | tok2str(bgp_attr_values, "Unknown Attribute", atype), | |
2843 | atype, | |
2844 | alen); | |
2845 | ||
2846 | if (aflags) { | |
2847 | ND_PRINT(", Flags [%s%s%s%s", | |
2848 | aflags & 0x80 ? "O" : "", | |
2849 | aflags & 0x40 ? "T" : "", | |
2850 | aflags & 0x20 ? "P" : "", | |
2851 | aflags & 0x10 ? "E" : ""); | |
2852 | if (aflags & 0xf) | |
2853 | ND_PRINT("+%x", aflags & 0xf); | |
2854 | ND_PRINT("]: "); | |
2855 | } | |
2856 | if (len < alen) { | |
2857 | ND_PRINT(" [path attrs too short]"); | |
2858 | p += len; | |
2859 | length -= len; | |
2860 | break; | |
2861 | } | |
2862 | if (length < alen) | |
2863 | goto trunc; | |
2864 | if (!bgp_attr_print(ndo, atype, p, alen, 0)) | |
2865 | goto trunc; | |
2866 | p += alen; | |
2867 | len -= alen; | |
2868 | length -= alen; | |
2869 | } | |
2870 | } | |
2871 | ||
2872 | if (length) { | |
2873 | add_path = check_add_path(ndo, p, length, 32); | |
2874 | ND_PRINT("\n\t Updated routes:"); | |
2875 | while (length != 0) { | |
2876 | if (add_path) { | |
2877 | ND_TCHECK_4(p); | |
2878 | if (length < 4) | |
2879 | goto trunc; | |
2880 | path_id = GET_BE_U_4(p); | |
2881 | p += 4; | |
2882 | length -= 4; | |
2883 | } | |
2884 | i = decode_prefix4(ndo, p, length, buf, sizeof(buf)); | |
2885 | if (i == -1) { | |
2886 | ND_PRINT("\n\t (illegal prefix length)"); | |
2887 | break; | |
2888 | } else if (i == -2) | |
2889 | goto trunc; /* bytes left, but not enough */ | |
2890 | else { | |
2891 | ND_PRINT("\n\t %s", buf); | |
2892 | if (add_path) { | |
2893 | ND_PRINT(" Path Id: %u", path_id); | |
2894 | } | |
2895 | p += i; | |
2896 | length -= i; | |
2897 | } | |
2898 | } | |
2899 | } | |
2900 | return; | |
c8cf0f94 | 2901 | trunc: |
ed775ee7 | 2902 | nd_print_trunc(ndo); |
c8cf0f94 PA |
2903 | } |
2904 | ||
2905 | static void | |
411677ae | 2906 | bgp_notification_print(netdissect_options *ndo, |
ed775ee7 | 2907 | const u_char *dat, u_int length) |
c8cf0f94 | 2908 | { |
ed775ee7 AHJ |
2909 | const struct bgp_notification *bgp_notification_header; |
2910 | const u_char *tptr; | |
2911 | uint8_t bgpn_major, bgpn_minor; | |
2912 | uint8_t shutdown_comm_length; | |
2913 | uint8_t remainder_offset; | |
2914 | ||
2915 | ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE); | |
2916 | if (length<BGP_NOTIFICATION_SIZE) | |
2917 | return; | |
c8cf0f94 | 2918 | |
ed775ee7 AHJ |
2919 | bgp_notification_header = (const struct bgp_notification *)dat; |
2920 | bgpn_major = GET_U_1(bgp_notification_header->bgpn_major); | |
2921 | bgpn_minor = GET_U_1(bgp_notification_header->bgpn_minor); | |
c8cf0f94 | 2922 | |
ed775ee7 AHJ |
2923 | ND_PRINT(", %s (%u)", |
2924 | tok2str(bgp_notify_major_values, "Unknown Error", | |
2925 | bgpn_major), | |
2926 | bgpn_major); | |
c8cf0f94 | 2927 | |
ed775ee7 | 2928 | switch (bgpn_major) { |
c8cf0f94 | 2929 | |
ed775ee7 AHJ |
2930 | case BGP_NOTIFY_MAJOR_MSG: |
2931 | ND_PRINT(", subcode %s (%u)", | |
2932 | tok2str(bgp_notify_minor_msg_values, "Unknown", | |
2933 | bgpn_minor), | |
2934 | bgpn_minor); | |
2935 | break; | |
2936 | case BGP_NOTIFY_MAJOR_OPEN: | |
2937 | ND_PRINT(", subcode %s (%u)", | |
2938 | tok2str(bgp_notify_minor_open_values, "Unknown", | |
2939 | bgpn_minor), | |
2940 | bgpn_minor); | |
2941 | break; | |
2942 | case BGP_NOTIFY_MAJOR_UPDATE: | |
2943 | ND_PRINT(", subcode %s (%u)", | |
2944 | tok2str(bgp_notify_minor_update_values, "Unknown", | |
2945 | bgpn_minor), | |
2946 | bgpn_minor); | |
2947 | break; | |
2948 | case BGP_NOTIFY_MAJOR_FSM: | |
2949 | ND_PRINT(" subcode %s (%u)", | |
2950 | tok2str(bgp_notify_minor_fsm_values, "Unknown", | |
2951 | bgpn_minor), | |
2952 | bgpn_minor); | |
2953 | break; | |
2954 | case BGP_NOTIFY_MAJOR_CAP: | |
2955 | ND_PRINT(" subcode %s (%u)", | |
2956 | tok2str(bgp_notify_minor_cap_values, "Unknown", | |
2957 | bgpn_minor), | |
2958 | bgpn_minor); | |
2959 | break; | |
2960 | case BGP_NOTIFY_MAJOR_CEASE: | |
2961 | ND_PRINT(", subcode %s (%u)", | |
2962 | tok2str(bgp_notify_minor_cease_values, "Unknown", | |
2963 | bgpn_minor), | |
2964 | bgpn_minor); | |
2965 | ||
2966 | /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes | |
2967 | * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES | |
2968 | */ | |
2969 | if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) { | |
2970 | tptr = dat + BGP_NOTIFICATION_SIZE; | |
2971 | ND_PRINT(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u", | |
2972 | tok2str(af_values, "Unknown", GET_BE_U_2(tptr)), | |
2973 | GET_BE_U_2(tptr), | |
2974 | tok2str(bgp_safi_values, "Unknown", GET_U_1((tptr + 2))), | |
2975 | GET_U_1((tptr + 2)), | |
2976 | GET_BE_U_4(tptr + 3)); | |
c8cf0f94 | 2977 | } |
ed775ee7 AHJ |
2978 | /* |
2979 | * draft-ietf-idr-shutdown describes a method to send a communication | |
2980 | * intended for human consumption regarding the Administrative Shutdown | |
2981 | */ | |
2982 | if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT || | |
2983 | bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) && | |
2984 | length >= BGP_NOTIFICATION_SIZE + 1) { | |
2985 | tptr = dat + BGP_NOTIFICATION_SIZE; | |
2986 | shutdown_comm_length = GET_U_1(tptr); | |
2987 | remainder_offset = 0; | |
2988 | /* garbage, hexdump it all */ | |
2989 | if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN || | |
2990 | shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) { | |
2991 | ND_PRINT(", invalid Shutdown Communication length"); | |
2992 | } | |
2993 | else if (shutdown_comm_length == 0) { | |
2994 | ND_PRINT(", empty Shutdown Communication"); | |
2995 | remainder_offset += 1; | |
2996 | } | |
2997 | /* a proper shutdown communication */ | |
2998 | else { | |
2999 | ND_TCHECK_LEN(tptr + 1, shutdown_comm_length); | |
3000 | ND_PRINT(", Shutdown Communication (length: %u): \"", shutdown_comm_length); | |
3001 | (void)nd_printn(ndo, tptr+1, shutdown_comm_length, NULL); | |
3002 | ND_PRINT("\""); | |
3003 | remainder_offset += shutdown_comm_length + 1; | |
3004 | } | |
3005 | /* if there is trailing data, hexdump it */ | |
3006 | if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) { | |
3007 | ND_PRINT(", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE)); | |
3008 | hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE)); | |
3009 | } | |
3010 | } | |
3011 | break; | |
3012 | default: | |
3013 | break; | |
3014 | } | |
c8cf0f94 | 3015 | |
ed775ee7 | 3016 | return; |
c8cf0f94 | 3017 | trunc: |
ed775ee7 | 3018 | nd_print_trunc(ndo); |
c8cf0f94 PA |
3019 | } |
3020 | ||
3021 | static void | |
411677ae | 3022 | bgp_route_refresh_print(netdissect_options *ndo, |
ed775ee7 | 3023 | const u_char *pptr, u_int len) |
411677ae | 3024 | { |
ed775ee7 | 3025 | const struct bgp_route_refresh *bgp_route_refresh_header; |
c8cf0f94 | 3026 | |
ed775ee7 | 3027 | ND_TCHECK_LEN(pptr, BGP_ROUTE_REFRESH_SIZE); |
c8cf0f94 | 3028 | |
ed775ee7 AHJ |
3029 | /* some little sanity checking */ |
3030 | if (len<BGP_ROUTE_REFRESH_SIZE) | |
3031 | return; | |
c8cf0f94 | 3032 | |
ed775ee7 | 3033 | bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr; |
c8cf0f94 | 3034 | |
ed775ee7 AHJ |
3035 | ND_PRINT("\n\t AFI %s (%u), SAFI %s (%u)", |
3036 | tok2str(af_values,"Unknown", | |
3037 | GET_BE_U_2(bgp_route_refresh_header->afi)), | |
3038 | GET_BE_U_2(bgp_route_refresh_header->afi), | |
3039 | tok2str(bgp_safi_values,"Unknown", | |
3040 | GET_U_1(bgp_route_refresh_header->safi)), | |
3041 | GET_U_1(bgp_route_refresh_header->safi)); | |
411677ae | 3042 | |
ed775ee7 AHJ |
3043 | if (ndo->ndo_vflag > 1) { |
3044 | ND_TCHECK_LEN(pptr, len); | |
3045 | print_unknown_data(ndo, pptr, "\n\t ", len); | |
3046 | } | |
411677ae | 3047 | |
ed775ee7 | 3048 | return; |
c8cf0f94 | 3049 | trunc: |
ed775ee7 | 3050 | nd_print_trunc(ndo); |
c8cf0f94 PA |
3051 | } |
3052 | ||
3053 | static int | |
ed775ee7 AHJ |
3054 | bgp_pdu_print(netdissect_options *ndo, |
3055 | const u_char *dat, u_int length) | |
c8cf0f94 | 3056 | { |
ed775ee7 AHJ |
3057 | const struct bgp *bgp_header; |
3058 | uint8_t bgp_type; | |
3059 | ||
3060 | ND_TCHECK_LEN(dat, BGP_SIZE); | |
3061 | bgp_header = (const struct bgp *)dat; | |
3062 | bgp_type = GET_U_1(bgp_header->bgp_type); | |
3063 | ||
3064 | ND_PRINT("\n\t%s Message (%u), length: %u", | |
3065 | tok2str(bgp_msg_values, "Unknown", bgp_type), | |
3066 | bgp_type, | |
3067 | length); | |
3068 | ||
3069 | switch (bgp_type) { | |
3070 | case BGP_OPEN: | |
3071 | bgp_open_print(ndo, dat, length); | |
3072 | break; | |
3073 | case BGP_UPDATE: | |
3074 | bgp_update_print(ndo, dat, length); | |
3075 | break; | |
3076 | case BGP_NOTIFICATION: | |
3077 | bgp_notification_print(ndo, dat, length); | |
3078 | break; | |
3079 | case BGP_KEEPALIVE: | |
3080 | break; | |
3081 | case BGP_ROUTE_REFRESH: | |
3082 | bgp_route_refresh_print(ndo, dat, length); | |
3083 | break; | |
3084 | default: | |
3085 | /* we have no decoder for the BGP message */ | |
3086 | ND_TCHECK_LEN(dat, length); | |
3087 | ND_PRINT("\n\t no Message %u decoder", bgp_type); | |
3088 | print_unknown_data(ndo, dat, "\n\t ", length); | |
3089 | break; | |
3090 | } | |
3091 | return 1; | |
c8cf0f94 | 3092 | trunc: |
ed775ee7 AHJ |
3093 | nd_print_trunc(ndo); |
3094 | return 0; | |
c8cf0f94 PA |
3095 | } |
3096 | ||
3097 | void | |
411677ae | 3098 | bgp_print(netdissect_options *ndo, |
ed775ee7 | 3099 | const u_char *dat, u_int length _U_) |
c8cf0f94 | 3100 | { |
ed775ee7 AHJ |
3101 | const u_char *p; |
3102 | const u_char *ep = ndo->ndo_snapend; | |
3103 | const u_char *start; | |
3104 | const u_char marker[] = { | |
3105 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
3106 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
3107 | }; | |
3108 | const struct bgp *bgp_header; | |
3109 | uint16_t hlen; | |
3110 | ||
3111 | ndo->ndo_protocol = "bgp"; | |
3112 | ND_PRINT(": BGP"); | |
3113 | ||
3114 | if (ndo->ndo_vflag < 1) /* lets be less chatty */ | |
3115 | return; | |
c8cf0f94 | 3116 | |
ed775ee7 AHJ |
3117 | p = dat; |
3118 | start = p; | |
3119 | while (p < ep) { | |
3120 | if (!ND_TTEST_1(p)) | |
3121 | break; | |
3122 | if (GET_U_1(p) != 0xff) { | |
3123 | p++; | |
3124 | continue; | |
3125 | } | |
3126 | ||
3127 | if (!ND_TTEST_LEN(p, sizeof(marker))) | |
3128 | break; | |
3129 | if (memcmp(p, marker, sizeof(marker)) != 0) { | |
3130 | p++; | |
3131 | continue; | |
3132 | } | |
c8cf0f94 | 3133 | |
ed775ee7 AHJ |
3134 | /* found BGP header */ |
3135 | ND_TCHECK_LEN(p, BGP_SIZE); | |
3136 | bgp_header = (const struct bgp *)p; | |
3137 | ||
3138 | if (start != p) | |
3139 | nd_print_trunc(ndo); | |
3140 | ||
3141 | hlen = GET_BE_U_2(bgp_header->bgp_len); | |
3142 | if (hlen < BGP_SIZE) { | |
3143 | ND_PRINT("\nmessage length %u < %u", hlen, BGP_SIZE); | |
3144 | nd_print_invalid(ndo); | |
3145 | break; | |
3146 | } | |
3147 | ||
3148 | if (ND_TTEST_LEN(p, hlen)) { | |
3149 | if (!bgp_pdu_print(ndo, p, hlen)) | |
3150 | return; | |
3151 | p += hlen; | |
3152 | start = p; | |
3153 | } else { | |
3154 | ND_PRINT("\n[|BGP %s]", | |
3155 | tok2str(bgp_msg_values, | |
3156 | "Unknown Message Type", | |
3157 | GET_U_1(bgp_header->bgp_type))); | |
3158 | break; | |
3159 | } | |
3160 | } | |
3161 | ||
3162 | return; | |
c8cf0f94 PA |
3163 | |
3164 | trunc: | |
ed775ee7 | 3165 | nd_print_trunc(ndo); |
c8cf0f94 | 3166 | } |