Local changes: - Update some local modifications to fix build - Synch config.h with upstream as much as possible Changelog: https://git.tcpdump.org/tcpdump/blob/55bc126b0216cfe409b8d6bd378f65679d136ddf:/CHANGES Reviewed by: emaste Obtained from: https://www.tcpdump.org/release/tcpdump-4.99.4.tar.gz Sponsored by: The FreeBSD Foundation
3163 lines
106 KiB
C
3163 lines
106 KiB
C
/*
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* Copyright (C) 1999 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Extensively modified by Hannes Gredler (hannes@gredler.at) for more
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* complete BGP support.
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*/
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/* \summary: Border Gateway Protocol (BGP) printer */
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/* specification: RFC 4271 */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "netdissect-stdinc.h"
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#include <stdio.h>
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#include <string.h>
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#include "netdissect.h"
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#include "addrtoname.h"
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#include "extract.h"
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#include "af.h"
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#include "l2vpn.h"
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struct bgp {
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nd_byte bgp_marker[16];
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nd_uint16_t bgp_len;
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nd_uint8_t bgp_type;
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};
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#define BGP_SIZE 19 /* unaligned */
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#define BGP_OPEN 1
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#define BGP_UPDATE 2
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#define BGP_NOTIFICATION 3
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#define BGP_KEEPALIVE 4
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#define BGP_ROUTE_REFRESH 5
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static const struct tok bgp_msg_values[] = {
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{ BGP_OPEN, "Open"},
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{ BGP_UPDATE, "Update"},
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{ BGP_NOTIFICATION, "Notification"},
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{ BGP_KEEPALIVE, "Keepalive"},
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{ BGP_ROUTE_REFRESH, "Route Refresh"},
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{ 0, NULL}
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};
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struct bgp_open {
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nd_byte bgpo_marker[16];
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nd_uint16_t bgpo_len;
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nd_uint8_t bgpo_type;
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nd_uint8_t bgpo_version;
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nd_uint16_t bgpo_myas;
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nd_uint16_t bgpo_holdtime;
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nd_uint32_t bgpo_id;
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nd_uint8_t bgpo_optlen;
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/* options should follow */
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};
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#define BGP_OPEN_SIZE 29 /* unaligned */
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struct bgp_opt {
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nd_uint8_t bgpopt_type;
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nd_uint8_t bgpopt_len;
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/* variable length */
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};
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#define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
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#define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
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struct bgp_notification {
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nd_byte bgpn_marker[16];
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nd_uint16_t bgpn_len;
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nd_uint8_t bgpn_type;
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nd_uint8_t bgpn_major;
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nd_uint8_t bgpn_minor;
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};
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#define BGP_NOTIFICATION_SIZE 21 /* unaligned */
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struct bgp_route_refresh {
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nd_byte bgp_marker[16];
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nd_uint16_t len;
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nd_uint8_t type; /* No padding after this; afi is, in fact, not aligned */
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nd_uint16_t afi;
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nd_uint8_t res;
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nd_uint8_t safi;
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};
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#define BGP_ROUTE_REFRESH_SIZE 23
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#define bgp_attr_lenlen(flags, p) \
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(((flags) & 0x10) ? 2U : 1U)
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#define bgp_attr_len(flags, p) \
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(((flags) & 0x10) ? GET_BE_U_2(p) : GET_U_1(p))
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#define BGPTYPE_ORIGIN 1
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#define BGPTYPE_AS_PATH 2
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#define BGPTYPE_NEXT_HOP 3
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#define BGPTYPE_MULTI_EXIT_DISC 4
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#define BGPTYPE_LOCAL_PREF 5
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#define BGPTYPE_ATOMIC_AGGREGATE 6
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#define BGPTYPE_AGGREGATOR 7
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#define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
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#define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */
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#define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */
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#define BGPTYPE_DPA 11 /* deprecated, draft-ietf-idr-bgp-dpa */
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#define BGPTYPE_ADVERTISERS 12 /* deprecated RFC1863 */
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#define BGPTYPE_RCID_PATH 13 /* deprecated RFC1863 */
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#define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */
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#define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */
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#define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */
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#define BGPTYPE_AS4_PATH 17 /* RFC6793 */
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#define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */
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#define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */
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#define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */
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#define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */
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#define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */
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#define BGPTYPE_AIGP 26 /* RFC7311 */
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#define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */
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#define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */
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#define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */
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#define BGPTYPE_ATTR_SET 128 /* RFC6368 */
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#define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
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static const struct tok bgp_attr_values[] = {
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{ BGPTYPE_ORIGIN, "Origin"},
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{ BGPTYPE_AS_PATH, "AS Path"},
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{ BGPTYPE_AS4_PATH, "AS4 Path"},
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{ BGPTYPE_NEXT_HOP, "Next Hop"},
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{ BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
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{ BGPTYPE_LOCAL_PREF, "Local Preference"},
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{ BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
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{ BGPTYPE_AGGREGATOR, "Aggregator"},
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{ BGPTYPE_AGGREGATOR4, "Aggregator4"},
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{ BGPTYPE_COMMUNITIES, "Community"},
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{ BGPTYPE_ORIGINATOR_ID, "Originator ID"},
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{ BGPTYPE_CLUSTER_LIST, "Cluster List"},
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{ BGPTYPE_DPA, "DPA"},
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{ BGPTYPE_ADVERTISERS, "Advertisers"},
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{ BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"},
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{ BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
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{ BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
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{ BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
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{ BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
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{ BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"},
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{ BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"},
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{ BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
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{ BGPTYPE_AIGP, "Accumulated IGP Metric"},
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{ BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
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{ BGPTYPE_ENTROPY_LABEL, "Entropy Label"},
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{ BGPTYPE_LARGE_COMMUNITY, "Large Community"},
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{ BGPTYPE_ATTR_SET, "Attribute Set"},
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{ 255, "Reserved for development"},
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{ 0, NULL}
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};
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#define BGP_AS_SET 1
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#define BGP_AS_SEQUENCE 2
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#define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
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#define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
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#define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
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#define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
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static const struct tok bgp_as_path_segment_open_values[] = {
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{ BGP_AS_SEQUENCE, ""},
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{ BGP_AS_SET, "{ "},
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{ BGP_CONFED_AS_SEQUENCE, "( "},
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{ BGP_CONFED_AS_SET, "({ "},
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{ 0, NULL}
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};
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static const struct tok bgp_as_path_segment_close_values[] = {
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{ BGP_AS_SEQUENCE, ""},
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{ BGP_AS_SET, "}"},
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{ BGP_CONFED_AS_SEQUENCE, ")"},
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{ BGP_CONFED_AS_SET, "})"},
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{ 0, NULL}
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};
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#define BGP_OPT_AUTH 1
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#define BGP_OPT_CAP 2
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static const struct tok bgp_opt_values[] = {
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{ BGP_OPT_AUTH, "Authentication Information"},
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{ BGP_OPT_CAP, "Capabilities Advertisement"},
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{ 0, NULL}
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};
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#define BGP_CAPCODE_MP 1 /* RFC2858 */
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#define BGP_CAPCODE_RR 2 /* RFC2918 */
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#define BGP_CAPCODE_ORF 3 /* RFC5291 */
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#define BGP_CAPCODE_MR 4 /* RFC3107 */
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#define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */
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#define BGP_CAPCODE_ML 8 /* RFC8277 */
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#define BGP_CAPCODE_RESTART 64 /* RFC4724 */
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#define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
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#define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
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#define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
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#define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
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#define BGP_CAPCODE_ENH_RR 70 /* draft-keyur-bgp-enhanced-route-refresh */
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#define BGP_CAPCODE_LLGR 71 /* draft-uttaro-idr-bgp-persistence-05 */
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#define BGP_CAPCODE_RR_CISCO 128
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static const struct tok bgp_capcode_values[] = {
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{ BGP_CAPCODE_MP, "Multiprotocol Extensions"},
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{ BGP_CAPCODE_RR, "Route Refresh"},
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{ BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
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{ BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
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{ BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
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{ BGP_CAPCODE_ML, "Multiple Labels"},
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{ BGP_CAPCODE_RESTART, "Graceful Restart"},
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{ BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
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{ BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
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{ BGP_CAPCODE_MULTISESS, "Multisession BGP"},
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{ BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
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{ BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
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{ BGP_CAPCODE_LLGR, "Long-lived Graceful Restart"},
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{ BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
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{ 0, NULL}
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};
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#define BGP_NOTIFY_MAJOR_MSG 1
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#define BGP_NOTIFY_MAJOR_OPEN 2
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#define BGP_NOTIFY_MAJOR_UPDATE 3
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#define BGP_NOTIFY_MAJOR_HOLDTIME 4
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#define BGP_NOTIFY_MAJOR_FSM 5
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#define BGP_NOTIFY_MAJOR_CEASE 6
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#define BGP_NOTIFY_MAJOR_CAP 7
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static const struct tok bgp_notify_major_values[] = {
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{ BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
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{ BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
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{ BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
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{ BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
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{ BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
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{ BGP_NOTIFY_MAJOR_CEASE, "Cease"},
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{ BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"},
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{ 0, NULL}
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};
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/* RFC 4486 */
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#define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
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#define BGP_NOTIFY_MINOR_CEASE_SHUT 2
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#define BGP_NOTIFY_MINOR_CEASE_RESET 4
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static const struct tok bgp_notify_minor_cease_values[] = {
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{ BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
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{ BGP_NOTIFY_MINOR_CEASE_SHUT, "Administrative Shutdown"},
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{ 3, "Peer Unconfigured"},
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{ BGP_NOTIFY_MINOR_CEASE_RESET, "Administrative Reset"},
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{ 5, "Connection Rejected"},
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{ 6, "Other Configuration Change"},
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{ 7, "Connection Collision Resolution"},
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{ 0, NULL}
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};
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static const struct tok bgp_notify_minor_msg_values[] = {
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{ 1, "Connection Not Synchronized"},
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{ 2, "Bad Message Length"},
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{ 3, "Bad Message Type"},
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{ 0, NULL}
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};
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static const struct tok bgp_notify_minor_open_values[] = {
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{ 1, "Unsupported Version Number"},
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{ 2, "Bad Peer AS"},
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{ 3, "Bad BGP Identifier"},
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{ 4, "Unsupported Optional Parameter"},
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{ 5, "Authentication Failure"},
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{ 6, "Unacceptable Hold Time"},
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{ 7, "Capability Message Error"},
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{ 0, NULL}
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};
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static const struct tok bgp_notify_minor_update_values[] = {
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{ 1, "Malformed Attribute List"},
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{ 2, "Unrecognized Well-known Attribute"},
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{ 3, "Missing Well-known Attribute"},
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{ 4, "Attribute Flags Error"},
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{ 5, "Attribute Length Error"},
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{ 6, "Invalid ORIGIN Attribute"},
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{ 7, "AS Routing Loop"},
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{ 8, "Invalid NEXT_HOP Attribute"},
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{ 9, "Optional Attribute Error"},
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{ 10, "Invalid Network Field"},
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{ 11, "Malformed AS_PATH"},
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{ 0, NULL}
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};
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static const struct tok bgp_notify_minor_fsm_values[] = {
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{ 0, "Unspecified Error"},
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{ 1, "In OpenSent State"},
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{ 2, "In OpenConfirm State"},
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{ 3, "In Established State"},
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{ 0, NULL }
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};
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static const struct tok bgp_notify_minor_cap_values[] = {
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{ 1, "Invalid Action Value" },
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{ 2, "Invalid Capability Length" },
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{ 3, "Malformed Capability Value" },
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{ 4, "Unsupported Capability Code" },
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{ 0, NULL }
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};
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static const struct tok bgp_origin_values[] = {
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{ 0, "IGP"},
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{ 1, "EGP"},
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{ 2, "Incomplete"},
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{ 0, NULL}
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};
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#define BGP_PMSI_TUNNEL_RSVP_P2MP 1
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#define BGP_PMSI_TUNNEL_LDP_P2MP 2
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#define BGP_PMSI_TUNNEL_PIM_SSM 3
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#define BGP_PMSI_TUNNEL_PIM_SM 4
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#define BGP_PMSI_TUNNEL_PIM_BIDIR 5
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#define BGP_PMSI_TUNNEL_INGRESS 6
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#define BGP_PMSI_TUNNEL_LDP_MP2MP 7
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static const struct tok bgp_pmsi_tunnel_values[] = {
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{ BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
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{ BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
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{ BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
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{ BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
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{ BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
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{ BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
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{ BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
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{ 0, NULL}
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};
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static const struct tok bgp_pmsi_flag_values[] = {
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{ 0x01, "Leaf Information required"},
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{ 0, NULL}
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};
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#define BGP_AIGP_TLV 1
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static const struct tok bgp_aigp_values[] = {
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{ BGP_AIGP_TLV, "AIGP"},
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{ 0, NULL}
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};
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/* Subsequent address family identifier, RFC2283 section 7 */
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#define SAFNUM_RES 0
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#define SAFNUM_UNICAST 1
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#define SAFNUM_MULTICAST 2
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#define SAFNUM_UNIMULTICAST 3 /* deprecated now */
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/* labeled BGP RFC3107 */
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#define SAFNUM_LABUNICAST 4
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/* RFC6514 */
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#define SAFNUM_MULTICAST_VPN 5
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/* draft-nalawade-kapoor-tunnel-safi */
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#define SAFNUM_TUNNEL 64
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/* RFC4761 */
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#define SAFNUM_VPLS 65
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/* RFC6037 */
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#define SAFNUM_MDT 66
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/* RFC7432 */
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#define SAFNUM_EVPN 70
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/* RFC4364 */
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#define SAFNUM_VPNUNICAST 128
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/* RFC6513 */
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#define SAFNUM_VPNMULTICAST 129
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#define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */
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/* RFC4684 */
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#define SAFNUM_RT_ROUTING_INFO 132
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#define BGP_VPN_RD_LEN 8
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static const struct tok bgp_safi_values[] = {
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{ SAFNUM_RES, "Reserved"},
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{ SAFNUM_UNICAST, "Unicast"},
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{ SAFNUM_MULTICAST, "Multicast"},
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{ SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
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{ SAFNUM_LABUNICAST, "labeled Unicast"},
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{ SAFNUM_TUNNEL, "Tunnel"},
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{ SAFNUM_VPLS, "VPLS"},
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{ SAFNUM_MDT, "MDT"},
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{ SAFNUM_EVPN, "EVPN"},
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{ SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
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{ SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
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{ SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
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{ SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
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{ SAFNUM_MULTICAST_VPN, "Multicast VPN"},
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{ 0, NULL }
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};
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/* well-known community */
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#define BGP_COMMUNITY_NO_EXPORT 0xffffff01
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#define BGP_COMMUNITY_NO_ADVERT 0xffffff02
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#define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
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/* Extended community type - RFC 4360 */
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#define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
|
|
#define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
|
|
#define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */
|
|
#define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */
|
|
#define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */
|
|
#define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */
|
|
#define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
|
|
/* rfc2547 bgp-mpls-vpns */
|
|
#define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */
|
|
#define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatibility */
|
|
#define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatibility */
|
|
#define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatibility */
|
|
|
|
#define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
|
|
#define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatibility */
|
|
#define BGP_EXT_COM_ENCAP 0x030c /* rfc5512 */
|
|
|
|
#define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
|
|
#define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatibility */
|
|
|
|
#define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */
|
|
|
|
#define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
|
|
#define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
|
|
#define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
|
|
#define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */
|
|
|
|
/* https://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */
|
|
#define BGP_EXT_COM_EIGRP_GEN 0x8800
|
|
#define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801
|
|
#define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
|
|
#define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803
|
|
#define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804
|
|
#define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
|
|
|
|
static const struct tok bgp_extd_comm_flag_values[] = {
|
|
{ 0x8000, "vendor-specific"},
|
|
{ 0x4000, "non-transitive"},
|
|
{ 0, NULL},
|
|
};
|
|
|
|
static const struct tok bgp_extd_comm_subtype_values[] = {
|
|
{ BGP_EXT_COM_RT_0, "target"},
|
|
{ BGP_EXT_COM_RT_1, "target"},
|
|
{ BGP_EXT_COM_RT_2, "target"},
|
|
{ BGP_EXT_COM_RO_0, "origin"},
|
|
{ BGP_EXT_COM_RO_1, "origin"},
|
|
{ BGP_EXT_COM_RO_2, "origin"},
|
|
{ BGP_EXT_COM_LINKBAND, "link-BW"},
|
|
{ BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"},
|
|
{ BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
|
|
{ BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
|
|
{ BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
|
|
{ BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"},
|
|
{ BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
|
|
{ BGP_EXT_COM_ENCAP, "encapsulation"},
|
|
{ BGP_EXT_COM_OSPF_RID, "ospf-router-id"},
|
|
{ BGP_EXT_COM_OSPF_RID2, "ospf-router-id"},
|
|
{ BGP_EXT_COM_L2INFO, "layer2-info"},
|
|
{ BGP_EXT_COM_EIGRP_GEN, "eigrp-general-route (flag, tag)" },
|
|
{ BGP_EXT_COM_EIGRP_METRIC_AS_DELAY, "eigrp-route-metric (AS, delay)" },
|
|
{ BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW, "eigrp-route-metric (reliability, nexthop, bandwidth)" },
|
|
{ BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU, "eigrp-route-metric (load, MTU)" },
|
|
{ BGP_EXT_COM_EIGRP_EXT_REMAS_REMID, "eigrp-external-route (remote-AS, remote-ID)" },
|
|
{ BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC, "eigrp-external-route (remote-proto, remote-metric)" },
|
|
{ BGP_EXT_COM_SOURCE_AS, "source-AS" },
|
|
{ BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
|
|
{ BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
|
|
{ BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
|
|
{ 0, NULL},
|
|
};
|
|
|
|
/* RFC RFC5512 BGP Tunnel Encapsulation Attribute Tunnel Types */
|
|
#define BGP_ENCAP_TUNNEL_L2TPV3_IP 1
|
|
#define BGP_ENCAP_TUNNEL_GRE 2
|
|
#define BGP_ENCAP_TUNNEL_TRANSMIT 3
|
|
#define BGP_ENCAP_TUNNEL_IPSEC 4
|
|
#define BGP_ENCAP_TUNNEL_IP_IPSEC 5
|
|
#define BGP_ENCAP_TUNNEL_MPLS_IP 6
|
|
#define BGP_ENCAP_TUNNEL_IP_IP 7
|
|
#define BGP_ENCAP_TUNNEL_VXLAN 8
|
|
#define BGP_ENCAP_TUNNEL_NVGRE 9
|
|
#define BGP_ENCAP_TUNNEL_MPLS 10
|
|
#define BGP_ENCAP_TUNNEL_MPLS_GRE 11
|
|
#define BGP_ENCAP_TUNNEL_VXLAN_GPE 12
|
|
#define BGP_ENCAP_TUNNEL_MPLS_UDP 13
|
|
#define BGP_ENCAP_TUNNEL_IPV6 14
|
|
#define BGP_ENCAP_TUNNEL_SR_TE 15
|
|
#define BGP_ENCAP_TUNNEL_BARE 16
|
|
#define BGP_ENCAP_TUNNEL_SR 17
|
|
|
|
static const struct tok bgp_extd_comm_encap_tunnel_values[] = {
|
|
{ BGP_ENCAP_TUNNEL_L2TPV3_IP, "L2TPv3 over IP"},
|
|
{ BGP_ENCAP_TUNNEL_GRE, "GRE"},
|
|
{ BGP_ENCAP_TUNNEL_TRANSMIT, "Transmit Tunnel"},
|
|
{ BGP_ENCAP_TUNNEL_IPSEC, "IPsec"},
|
|
{ BGP_ENCAP_TUNNEL_IP_IPSEC, "IP in IP with IPsec"},
|
|
{ BGP_ENCAP_TUNNEL_MPLS_IP, "MPLS in IP with IPsec"},
|
|
{ BGP_ENCAP_TUNNEL_IP_IP, "IP in IP"},
|
|
{ BGP_ENCAP_TUNNEL_VXLAN, "VXLAN"},
|
|
{ BGP_ENCAP_TUNNEL_NVGRE, "NVGRE"},
|
|
{ BGP_ENCAP_TUNNEL_MPLS, "MPLS"},
|
|
{ BGP_ENCAP_TUNNEL_MPLS_GRE, "MPLS in GRE"},
|
|
{ BGP_ENCAP_TUNNEL_VXLAN_GPE, "VXLAN GPE"},
|
|
{ BGP_ENCAP_TUNNEL_MPLS_UDP, "MPLS in UDP"},
|
|
{ BGP_ENCAP_TUNNEL_IPV6, "IPv6"},
|
|
{ BGP_ENCAP_TUNNEL_SR_TE, "SR TE"},
|
|
{ BGP_ENCAP_TUNNEL_BARE, "Bare"},
|
|
{ BGP_ENCAP_TUNNEL_SR, "SR"},
|
|
{ 0, NULL},
|
|
};
|
|
|
|
/* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */
|
|
#define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */
|
|
#define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */
|
|
#define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */
|
|
#define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
|
|
#define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/
|
|
#define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */
|
|
#define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
|
|
|
|
static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
|
|
{ BGP_OSPF_RTYPE_RTR, "Router" },
|
|
{ BGP_OSPF_RTYPE_NET, "Network" },
|
|
{ BGP_OSPF_RTYPE_SUM, "Summary" },
|
|
{ BGP_OSPF_RTYPE_EXT, "External" },
|
|
{ BGP_OSPF_RTYPE_NSSA,"NSSA External" },
|
|
{ BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
|
|
{ 0, NULL },
|
|
};
|
|
|
|
/* ADD-PATH Send/Receive field values */
|
|
static const struct tok bgp_add_path_recvsend[] = {
|
|
{ 1, "Receive" },
|
|
{ 2, "Send" },
|
|
{ 3, "Both" },
|
|
{ 0, NULL },
|
|
};
|
|
|
|
#define AS_STR_SIZE sizeof("xxxxx.xxxxx")
|
|
|
|
/*
|
|
* as_printf
|
|
*
|
|
* Convert an AS number into a string and return string pointer.
|
|
*
|
|
* Depending on bflag is set or not, AS number is converted into ASDOT notation
|
|
* or plain number notation.
|
|
*
|
|
*/
|
|
static char *
|
|
as_printf(netdissect_options *ndo,
|
|
char *str, size_t size, u_int asnum)
|
|
{
|
|
if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
|
|
snprintf(str, size, "%u", asnum);
|
|
} else {
|
|
snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
|
|
}
|
|
return str;
|
|
}
|
|
|
|
#define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
|
|
|
|
int
|
|
decode_prefix4(netdissect_options *ndo,
|
|
const u_char *pptr, u_int itemlen, char *buf, size_t buflen)
|
|
{
|
|
nd_ipv4 addr;
|
|
u_int plen, plenbytes;
|
|
|
|
ITEMCHECK(1);
|
|
plen = GET_U_1(pptr);
|
|
if (32 < plen)
|
|
return -1;
|
|
itemlen -= 1;
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
plenbytes = (plen + 7) / 8;
|
|
ITEMCHECK(plenbytes);
|
|
GET_CPY_BYTES(&addr, pptr + 1, plenbytes);
|
|
if (plen % 8) {
|
|
((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
|
|
}
|
|
snprintf(buf, buflen, "%s/%u", ipaddr_string(ndo, (const u_char *)&addr), plen);
|
|
return 1 + plenbytes;
|
|
|
|
badtlv:
|
|
return -2;
|
|
}
|
|
|
|
static int
|
|
decode_labeled_prefix4(netdissect_options *ndo,
|
|
const u_char *pptr, u_int itemlen, char *buf,
|
|
size_t buflen)
|
|
{
|
|
nd_ipv4 addr;
|
|
u_int plen, plenbytes;
|
|
|
|
/* prefix length and label = 4 bytes */
|
|
ND_TCHECK_4(pptr);
|
|
ITEMCHECK(4);
|
|
plen = GET_U_1(pptr); /* get prefix length */
|
|
|
|
/* this is one of the weirdnesses of rfc3107
|
|
the label length (actually the label + COS bits)
|
|
is added to the prefix length;
|
|
we also do only read out just one label -
|
|
there is no real application for advertisement of
|
|
stacked labels in a single BGP message
|
|
*/
|
|
|
|
if (24 > plen)
|
|
return -1;
|
|
|
|
plen-=24; /* adjust prefixlen - labellength */
|
|
|
|
if (32 < plen)
|
|
return -1;
|
|
itemlen -= 4;
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
plenbytes = (plen + 7) / 8;
|
|
ITEMCHECK(plenbytes);
|
|
GET_CPY_BYTES(&addr, pptr + 4, plenbytes);
|
|
if (plen % 8) {
|
|
((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
|
|
}
|
|
/* the label may get offsetted by 4 bits so lets shift it right */
|
|
snprintf(buf, buflen, "%s/%u, label:%u %s",
|
|
ipaddr_string(ndo, (const u_char *)&addr),
|
|
plen,
|
|
GET_BE_U_3(pptr + 1)>>4,
|
|
((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
|
|
|
|
return 4 + plenbytes;
|
|
|
|
trunc:
|
|
return -2;
|
|
|
|
badtlv:
|
|
return -3;
|
|
}
|
|
|
|
/*
|
|
* bgp_vpn_ip_print
|
|
*
|
|
* print an ipv4 or ipv6 address into a buffer dependent on address length.
|
|
*/
|
|
static char *
|
|
bgp_vpn_ip_print(netdissect_options *ndo,
|
|
const u_char *pptr, u_int addr_length)
|
|
{
|
|
|
|
/* worst case string is s fully formatted v6 address */
|
|
static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
|
|
char *pos = addr;
|
|
|
|
switch(addr_length) {
|
|
case (sizeof(nd_ipv4) << 3): /* 32 */
|
|
snprintf(pos, sizeof(addr), "%s", GET_IPADDR_STRING(pptr));
|
|
break;
|
|
case (sizeof(nd_ipv6) << 3): /* 128 */
|
|
snprintf(pos, sizeof(addr), "%s", GET_IP6ADDR_STRING(pptr));
|
|
break;
|
|
default:
|
|
snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
|
|
break;
|
|
}
|
|
pos += strlen(pos);
|
|
|
|
*(pos) = '\0';
|
|
return (addr);
|
|
}
|
|
|
|
/*
|
|
* bgp_vpn_sg_print
|
|
*
|
|
* print an multicast s,g entry into a buffer.
|
|
* the s,g entry is encoded like this.
|
|
*
|
|
* +-----------------------------------+
|
|
* | Multicast Source Length (1 octet) |
|
|
* +-----------------------------------+
|
|
* | Multicast Source (Variable) |
|
|
* +-----------------------------------+
|
|
* | Multicast Group Length (1 octet) |
|
|
* +-----------------------------------+
|
|
* | Multicast Group (Variable) |
|
|
* +-----------------------------------+
|
|
*
|
|
* return the number of bytes read from the wire.
|
|
*/
|
|
static u_int
|
|
bgp_vpn_sg_print(netdissect_options *ndo,
|
|
const u_char *pptr, char *buf, size_t buflen)
|
|
{
|
|
uint8_t addr_length;
|
|
u_int total_length, offset;
|
|
|
|
total_length = 0;
|
|
|
|
/* Source address length, encoded in bits */
|
|
addr_length = GET_U_1(pptr);
|
|
pptr++;
|
|
|
|
/* Source address */
|
|
ND_TCHECK_LEN(pptr, (addr_length >> 3));
|
|
total_length += (addr_length >> 3) + 1;
|
|
offset = (u_int)strlen(buf);
|
|
if (addr_length) {
|
|
snprintf(buf + offset, buflen - offset, ", Source %s",
|
|
bgp_vpn_ip_print(ndo, pptr, addr_length));
|
|
pptr += (addr_length >> 3);
|
|
}
|
|
|
|
/* Group address length, encoded in bits */
|
|
addr_length = GET_U_1(pptr);
|
|
pptr++;
|
|
|
|
/* Group address */
|
|
ND_TCHECK_LEN(pptr, (addr_length >> 3));
|
|
total_length += (addr_length >> 3) + 1;
|
|
offset = (u_int)strlen(buf);
|
|
if (addr_length) {
|
|
snprintf(buf + offset, buflen - offset, ", Group %s",
|
|
bgp_vpn_ip_print(ndo, pptr, addr_length));
|
|
pptr += (addr_length >> 3);
|
|
}
|
|
|
|
trunc:
|
|
return (total_length);
|
|
}
|
|
|
|
/* Print an RFC 4364 Route Distinguisher */
|
|
const char *
|
|
bgp_vpn_rd_print(netdissect_options *ndo,
|
|
const u_char *pptr)
|
|
{
|
|
/* allocate space for the largest possible string */
|
|
static char rd[sizeof("xxxxx.xxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
|
|
char *pos = rd;
|
|
/* allocate space for the largest possible string */
|
|
char astostr[AS_STR_SIZE];
|
|
|
|
/* ok lets load the RD format */
|
|
switch (GET_BE_U_2(pptr)) {
|
|
|
|
case 0:
|
|
/* 2-byte-AS:number fmt */
|
|
snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
|
|
GET_BE_U_2(pptr + 2),
|
|
GET_BE_U_4(pptr + 4),
|
|
GET_U_1(pptr + 4), GET_U_1(pptr + 5),
|
|
GET_U_1(pptr + 6), GET_U_1(pptr + 7));
|
|
break;
|
|
|
|
case 1:
|
|
/* IP-address:AS fmt */
|
|
snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
|
|
GET_U_1(pptr + 2), GET_U_1(pptr + 3),
|
|
GET_U_1(pptr + 4), GET_U_1(pptr + 5),
|
|
GET_BE_U_2(pptr + 6));
|
|
break;
|
|
|
|
case 2:
|
|
/* 4-byte-AS:number fmt */
|
|
snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
|
|
as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 2)),
|
|
GET_BE_U_2(pptr + 6), GET_U_1(pptr + 2),
|
|
GET_U_1(pptr + 3), GET_U_1(pptr + 4),
|
|
GET_U_1(pptr + 5), GET_BE_U_2(pptr + 6));
|
|
break;
|
|
default:
|
|
snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
|
|
break;
|
|
}
|
|
pos += strlen(pos);
|
|
*(pos) = '\0';
|
|
return (rd);
|
|
}
|
|
|
|
/*
|
|
* Print an RFC 4360 Extended Community.
|
|
*/
|
|
static void
|
|
bgp_extended_community_print(netdissect_options *ndo,
|
|
const u_char *pptr)
|
|
{
|
|
union { /* copy buffer for bandwidth values */
|
|
float f;
|
|
uint32_t i;
|
|
} bw;
|
|
/* allocate space for the largest possible string */
|
|
char astostr[AS_STR_SIZE];
|
|
|
|
switch (GET_BE_U_2(pptr)) {
|
|
|
|
case BGP_EXT_COM_RT_0:
|
|
case BGP_EXT_COM_RO_0:
|
|
case BGP_EXT_COM_L2VPN_RT_0:
|
|
ND_PRINT("%u:%u (= %s)",
|
|
GET_BE_U_2(pptr + 2),
|
|
GET_BE_U_4(pptr + 4),
|
|
GET_IPADDR_STRING(pptr+4));
|
|
break;
|
|
|
|
case BGP_EXT_COM_RT_1:
|
|
case BGP_EXT_COM_RO_1:
|
|
case BGP_EXT_COM_L2VPN_RT_1:
|
|
case BGP_EXT_COM_VRF_RT_IMP:
|
|
ND_PRINT("%s:%u",
|
|
GET_IPADDR_STRING(pptr+2),
|
|
GET_BE_U_2(pptr + 6));
|
|
break;
|
|
|
|
case BGP_EXT_COM_RT_2:
|
|
case BGP_EXT_COM_RO_2:
|
|
ND_PRINT("%s:%u",
|
|
as_printf(ndo, astostr, sizeof(astostr),
|
|
GET_BE_U_4(pptr + 2)), GET_BE_U_2(pptr + 6));
|
|
break;
|
|
|
|
case BGP_EXT_COM_LINKBAND:
|
|
bw.i = GET_BE_U_4(pptr + 4);
|
|
ND_PRINT("bandwidth: %.3f Mbps",
|
|
bw.f*8/1000000);
|
|
break;
|
|
|
|
case BGP_EXT_COM_VPN_ORIGIN:
|
|
case BGP_EXT_COM_VPN_ORIGIN2:
|
|
case BGP_EXT_COM_VPN_ORIGIN3:
|
|
case BGP_EXT_COM_VPN_ORIGIN4:
|
|
case BGP_EXT_COM_OSPF_RID:
|
|
case BGP_EXT_COM_OSPF_RID2:
|
|
ND_PRINT("%s", GET_IPADDR_STRING(pptr+2));
|
|
break;
|
|
|
|
case BGP_EXT_COM_OSPF_RTYPE:
|
|
case BGP_EXT_COM_OSPF_RTYPE2:
|
|
ND_PRINT("area:%s, router-type:%s, metric-type:%s%s",
|
|
GET_IPADDR_STRING(pptr+2),
|
|
tok2str(bgp_extd_comm_ospf_rtype_values,
|
|
"unknown (0x%02x)",
|
|
GET_U_1((pptr + 6))),
|
|
(GET_U_1(pptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
|
|
((GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_EXT) || (GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "");
|
|
break;
|
|
|
|
case BGP_EXT_COM_L2INFO:
|
|
ND_PRINT("%s Control Flags [0x%02x]:MTU %u",
|
|
tok2str(l2vpn_encaps_values,
|
|
"unknown encaps",
|
|
GET_U_1((pptr + 2))),
|
|
GET_U_1((pptr + 3)),
|
|
GET_BE_U_2(pptr + 4));
|
|
break;
|
|
|
|
case BGP_EXT_COM_SOURCE_AS:
|
|
ND_PRINT("AS %u", GET_BE_U_2(pptr + 2));
|
|
break;
|
|
|
|
case BGP_EXT_COM_ENCAP:
|
|
ND_PRINT("Tunnel type: %s", tok2str(bgp_extd_comm_encap_tunnel_values,
|
|
"unknown encaps",
|
|
GET_BE_U_2(pptr + 6)));
|
|
break;
|
|
|
|
default:
|
|
ND_PRINT("%02x%02x%02x%02x%02x%02x",
|
|
GET_U_1(pptr + 2),
|
|
GET_U_1(pptr + 3),
|
|
GET_U_1(pptr + 4),
|
|
GET_U_1(pptr + 5),
|
|
GET_U_1(pptr + 6),
|
|
GET_U_1(pptr + 7));
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* RFC4684 (Section 4)/RFC2858 (Section 4).
|
|
* RTC membership prefix is structured as follows
|
|
* [prefix-len] [origin-as] [route-target]
|
|
* The route-target is encoded as RT ext-comms.
|
|
* Prefix-len may be 0, 32..96
|
|
*
|
|
* Note that pptr is not packet data - it is
|
|
* a buffer owned by our caller - therefore GET_*
|
|
* macros can not be used.
|
|
*/
|
|
static char *
|
|
bgp_rt_prefix_print(netdissect_options *ndo,
|
|
const u_char *pptr,
|
|
u_int plen)
|
|
{
|
|
/* allocate space for the largest possible string */
|
|
char rtc_prefix_in_hex[sizeof("0000 0000 0000 0000")] = "";
|
|
u_int rtc_prefix_in_hex_len = 0;
|
|
static char output[61]; /* max response string */
|
|
/* allocate space for the largest possible string */
|
|
char astostr[AS_STR_SIZE];
|
|
uint16_t ec_type = 0;
|
|
u_int octet_count;
|
|
u_int i;
|
|
|
|
if (plen == 0) {
|
|
snprintf(output, sizeof(output), "route-target: 0:0/0");
|
|
return (output);
|
|
}
|
|
|
|
/* hex representation of the prefix */
|
|
octet_count = (plen+7)/8;
|
|
for (i=0; i<octet_count; i++) {
|
|
rtc_prefix_in_hex_len += snprintf(rtc_prefix_in_hex+rtc_prefix_in_hex_len,
|
|
sizeof(rtc_prefix_in_hex)-rtc_prefix_in_hex_len,
|
|
"%02x%s", *(pptr+i),
|
|
((i%2 == 1) && (i<octet_count-1)) ? " " : "");
|
|
}
|
|
|
|
if (plen < 16) {
|
|
/*
|
|
* The prefix is too short to include the full ext-comm type,
|
|
* so we have no way to parse it further.
|
|
*/
|
|
snprintf(output, sizeof(output), "route-target: partial-type: (%s/%d)",
|
|
rtc_prefix_in_hex, plen);
|
|
return (output);
|
|
}
|
|
|
|
/*
|
|
* get the ext-comm type
|
|
* Note: pptr references a static 8 octet buffer with unused bits set to 0,
|
|
* hence EXTRACT_*() macros are safe.
|
|
*/
|
|
ec_type = EXTRACT_BE_U_2(pptr);
|
|
switch (ec_type) {
|
|
case BGP_EXT_COM_RT_0:
|
|
/* 2-byte-AS:number fmt */
|
|
snprintf(output, sizeof(output), "route-target: %u:%u/%d (%s)",
|
|
EXTRACT_BE_U_2(pptr+2),
|
|
EXTRACT_BE_U_4(pptr+4),
|
|
plen, rtc_prefix_in_hex);
|
|
break;
|
|
|
|
case BGP_EXT_COM_RT_1:
|
|
/* IP-address:AS fmt */
|
|
snprintf(output, sizeof(output), "route-target: %u.%u.%u.%u:%u/%d (%s)",
|
|
*(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5),
|
|
EXTRACT_BE_U_2(pptr+6), plen, rtc_prefix_in_hex);
|
|
break;
|
|
|
|
case BGP_EXT_COM_RT_2:
|
|
/* 4-byte-AS:number fmt */
|
|
snprintf(output, sizeof(output), "route-target: %s:%u/%d (%s)",
|
|
as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(pptr+2)),
|
|
EXTRACT_BE_U_2(pptr+6), plen, rtc_prefix_in_hex);
|
|
break;
|
|
|
|
default:
|
|
snprintf(output, sizeof(output), "route target: unknown-type(%04x) (%s/%d)",
|
|
ec_type,
|
|
rtc_prefix_in_hex, plen);
|
|
break;
|
|
}
|
|
return (output);
|
|
}
|
|
|
|
/* RFC 4684 */
|
|
static int
|
|
decode_rt_routing_info(netdissect_options *ndo,
|
|
const u_char *pptr)
|
|
{
|
|
uint8_t route_target[8];
|
|
u_int plen;
|
|
/* allocate space for the largest possible string */
|
|
char astostr[AS_STR_SIZE];
|
|
u_int num_octets;
|
|
|
|
/* NLRI "prefix length" from RFC 2858 Section 4. */
|
|
plen = GET_U_1(pptr); /* get prefix length */
|
|
|
|
/* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
|
|
* RFC 4684 Section 4 defines the layout of "origin AS" and "route
|
|
* target" fields inside the "prefix" depending on its length.
|
|
*/
|
|
if (0 == plen) {
|
|
/* Without "origin AS", without "route target". */
|
|
ND_PRINT("\n\t default route target");
|
|
return 1;
|
|
}
|
|
|
|
if (32 > plen) {
|
|
ND_PRINT("\n\t (illegal prefix length)");
|
|
return -1;
|
|
}
|
|
|
|
/* With at least "origin AS", possibly with "route target". */
|
|
as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 1));
|
|
|
|
plen -= 32; /* adjust prefix length */
|
|
|
|
if (64 < plen) {
|
|
ND_PRINT("\n\t (illegal prefix length)");
|
|
return -1;
|
|
}
|
|
|
|
/* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 }
|
|
* and gives the number of octets in the variable-length "route
|
|
* target" field inside this NLRI "prefix". Look for it.
|
|
*/
|
|
memset(&route_target, 0, sizeof(route_target));
|
|
num_octets = (plen + 7) / 8;
|
|
GET_CPY_BYTES(&route_target, pptr + 5, num_octets);
|
|
/* If mask-len is not on octet boundary, ensure all extra bits are 0 */
|
|
if (plen % 8) {
|
|
((u_char *)&route_target)[num_octets - 1] &=
|
|
((0xff00 >> (plen % 8)) & 0xff);
|
|
}
|
|
ND_PRINT("\n\t origin AS: %s, %s",
|
|
astostr,
|
|
bgp_rt_prefix_print(ndo, (u_char *)&route_target, plen));
|
|
|
|
return 5 + num_octets;
|
|
}
|
|
|
|
static int
|
|
decode_labeled_vpn_prefix4(netdissect_options *ndo,
|
|
const u_char *pptr, char *buf, size_t buflen)
|
|
{
|
|
nd_ipv4 addr;
|
|
u_int plen;
|
|
|
|
plen = GET_U_1(pptr); /* get prefix length */
|
|
|
|
if ((24+64) > plen)
|
|
return -1;
|
|
|
|
plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
|
|
|
|
if (32 < plen)
|
|
return -1;
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
|
|
if (plen % 8) {
|
|
((u_char *)&addr)[(plen + 7) / 8 - 1] &=
|
|
((0xff00 >> (plen % 8)) & 0xff);
|
|
}
|
|
/* the label may get offsetted by 4 bits so lets shift it right */
|
|
snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
|
|
bgp_vpn_rd_print(ndo, pptr+4),
|
|
ipaddr_string(ndo, (const u_char *)&addr),
|
|
plen,
|
|
GET_BE_U_3(pptr + 1)>>4,
|
|
((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
|
|
|
|
return 12 + (plen + 7) / 8;
|
|
}
|
|
|
|
/*
|
|
* +-------------------------------+
|
|
* | |
|
|
* | RD:IPv4-address (12 octets) |
|
|
* | |
|
|
* +-------------------------------+
|
|
* | MDT Group-address (4 octets) |
|
|
* +-------------------------------+
|
|
*/
|
|
|
|
#define MDT_VPN_NLRI_LEN 16
|
|
|
|
static int
|
|
decode_mdt_vpn_nlri(netdissect_options *ndo,
|
|
const u_char *pptr, char *buf, size_t buflen)
|
|
{
|
|
const u_char *rd;
|
|
const u_char *vpn_ip;
|
|
|
|
/* if the NLRI is not predefined length, quit.*/
|
|
if (GET_U_1(pptr) != MDT_VPN_NLRI_LEN * 8)
|
|
return -1;
|
|
pptr++;
|
|
|
|
/* RD */
|
|
ND_TCHECK_8(pptr);
|
|
rd = pptr;
|
|
pptr += 8;
|
|
|
|
/* IPv4 address */
|
|
vpn_ip = pptr;
|
|
pptr += sizeof(nd_ipv4);
|
|
|
|
/* MDT Group Address */
|
|
snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
|
|
bgp_vpn_rd_print(ndo, rd), GET_IPADDR_STRING(vpn_ip), GET_IPADDR_STRING(pptr));
|
|
|
|
return MDT_VPN_NLRI_LEN + 1;
|
|
|
|
trunc:
|
|
return -2;
|
|
}
|
|
|
|
#define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1
|
|
#define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2
|
|
#define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3
|
|
#define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
|
|
#define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5
|
|
#define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6
|
|
#define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7
|
|
|
|
static const struct tok bgp_multicast_vpn_route_type_values[] = {
|
|
{ BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
|
|
{ BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
|
|
{ BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
|
|
{ BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
|
|
{ BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
|
|
{ BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
|
|
{ BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
|
|
{ 0, NULL}
|
|
};
|
|
|
|
static int
|
|
decode_multicast_vpn(netdissect_options *ndo,
|
|
const u_char *pptr, char *buf, size_t buflen)
|
|
{
|
|
/* allocate space for the largest possible string */
|
|
char astostr[AS_STR_SIZE];
|
|
uint8_t route_type, route_length;
|
|
u_int addr_length, sg_length;
|
|
u_int offset;
|
|
|
|
route_type = GET_U_1(pptr);
|
|
pptr++;
|
|
route_length = GET_U_1(pptr);
|
|
pptr++;
|
|
|
|
snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
|
|
tok2str(bgp_multicast_vpn_route_type_values,
|
|
"Unknown", route_type),
|
|
route_type, route_length);
|
|
|
|
switch(route_type) {
|
|
case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
|
|
ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
|
|
offset = (u_int)strlen(buf);
|
|
snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
|
|
bgp_vpn_rd_print(ndo, pptr),
|
|
bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
|
|
(route_length - BGP_VPN_RD_LEN) << 3));
|
|
break;
|
|
case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
|
|
ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
|
|
offset = (u_int)strlen(buf);
|
|
snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
|
|
bgp_vpn_rd_print(ndo, pptr),
|
|
as_printf(ndo, astostr, sizeof(astostr),
|
|
GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
|
|
break;
|
|
|
|
case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
|
|
ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
|
|
offset = (u_int)strlen(buf);
|
|
snprintf(buf + offset, buflen - offset, ", RD: %s",
|
|
bgp_vpn_rd_print(ndo, pptr));
|
|
pptr += BGP_VPN_RD_LEN;
|
|
|
|
sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
|
|
addr_length = route_length - sg_length;
|
|
|
|
ND_TCHECK_LEN(pptr, addr_length);
|
|
offset = (u_int)strlen(buf);
|
|
snprintf(buf + offset, buflen - offset, ", Originator %s",
|
|
bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
|
|
break;
|
|
|
|
case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
|
|
ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN);
|
|
offset = (u_int)strlen(buf);
|
|
snprintf(buf + offset, buflen - offset, ", RD: %s",
|
|
bgp_vpn_rd_print(ndo, pptr));
|
|
pptr += BGP_VPN_RD_LEN;
|
|
|
|
bgp_vpn_sg_print(ndo, pptr, buf, buflen);
|
|
break;
|
|
|
|
case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
|
|
case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
|
|
ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4);
|
|
offset = (u_int)strlen(buf);
|
|
snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
|
|
bgp_vpn_rd_print(ndo, pptr),
|
|
as_printf(ndo, astostr, sizeof(astostr),
|
|
GET_BE_U_4(pptr + BGP_VPN_RD_LEN)));
|
|
pptr += BGP_VPN_RD_LEN + 4;
|
|
|
|
bgp_vpn_sg_print(ndo, pptr, buf, buflen);
|
|
break;
|
|
|
|
/*
|
|
* no per route-type printing yet.
|
|
*/
|
|
case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return route_length + 2;
|
|
|
|
trunc:
|
|
return -2;
|
|
}
|
|
|
|
/*
|
|
* As I remember, some versions of systems have an snprintf() that
|
|
* returns -1 if the buffer would have overflowed. If the return
|
|
* value is negative, set buflen to 0, to indicate that we've filled
|
|
* the buffer up.
|
|
*
|
|
* If the return value is greater than buflen, that means that
|
|
* the buffer would have overflowed; again, set buflen to 0 in
|
|
* that case.
|
|
*/
|
|
#define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
|
|
if (stringlen<0) \
|
|
buflen=0; \
|
|
else if ((u_int)stringlen>buflen) \
|
|
buflen=0; \
|
|
else { \
|
|
buflen-=stringlen; \
|
|
buf+=stringlen; \
|
|
}
|
|
|
|
static int
|
|
decode_labeled_vpn_l2(netdissect_options *ndo,
|
|
const u_char *pptr, char *buf, size_t buflen)
|
|
{
|
|
u_int plen, tlen, tlv_type, tlv_len, ttlv_len;
|
|
int stringlen;
|
|
|
|
plen = GET_BE_U_2(pptr);
|
|
tlen = plen;
|
|
pptr += 2;
|
|
/* Old and new L2VPN NLRI share AFI/SAFI
|
|
* -> Assume a 12 Byte-length NLRI is auto-discovery-only
|
|
* and > 17 as old format. Complain for the middle case
|
|
*/
|
|
if (plen == 12) {
|
|
/* assume AD-only with RD, BGPNH */
|
|
ND_TCHECK_LEN(pptr, 12);
|
|
buf[0] = '\0';
|
|
stringlen = snprintf(buf, buflen, "RD: %s, BGPNH: %s",
|
|
bgp_vpn_rd_print(ndo, pptr),
|
|
GET_IPADDR_STRING(pptr+8));
|
|
UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
|
|
pptr += 12;
|
|
tlen -= 12;
|
|
return plen + 2;
|
|
} else if (plen > 17) {
|
|
/* assume old format */
|
|
/* RD, ID, LBLKOFF, LBLBASE */
|
|
|
|
ND_TCHECK_LEN(pptr, 15);
|
|
buf[0] = '\0';
|
|
stringlen = snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
|
|
bgp_vpn_rd_print(ndo, pptr),
|
|
GET_BE_U_2(pptr + 8),
|
|
GET_BE_U_2(pptr + 10),
|
|
GET_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
|
|
UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
|
|
pptr += 15;
|
|
tlen -= 15;
|
|
|
|
/* ok now the variable part - lets read out TLVs*/
|
|
while (tlen != 0) {
|
|
if (tlen < 3) {
|
|
if (buflen != 0) {
|
|
stringlen=snprintf(buf,buflen, "\n\t\tran past the end");
|
|
UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
|
|
}
|
|
return plen + 2;
|
|
}
|
|
tlv_type = GET_U_1(pptr);
|
|
pptr++;
|
|
tlv_len = GET_BE_U_2(pptr); /* length, in *bits* */
|
|
ttlv_len = (tlv_len + 7)/8; /* length, in *bytes* */
|
|
pptr += 2;
|
|
|
|
switch(tlv_type) {
|
|
case 1:
|
|
if (buflen != 0) {
|
|
stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
|
|
tlv_type,
|
|
tlv_len);
|
|
UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
|
|
}
|
|
while (ttlv_len != 0) {
|
|
if (tlen < 1) {
|
|
if (buflen != 0) {
|
|
stringlen=snprintf(buf,buflen, " (ran past the end)");
|
|
UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
|
|
}
|
|
return plen + 2;
|
|
}
|
|
ND_TCHECK_1(pptr);
|
|
if (buflen != 0) {
|
|
stringlen=snprintf(buf,buflen, "%02x",
|
|
GET_U_1(pptr));
|
|
pptr++;
|
|
UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
|
|
}
|
|
ttlv_len--;
|
|
tlen--;
|
|
}
|
|
break;
|
|
default:
|
|
if (buflen != 0) {
|
|
stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
|
|
tlv_type,
|
|
tlv_len);
|
|
UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
|
|
}
|
|
if (tlen < ttlv_len) {
|
|
if (buflen != 0) {
|
|
stringlen=snprintf(buf,buflen, " (ran past the end)");
|
|
UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
|
|
}
|
|
return plen + 2;
|
|
}
|
|
tlen -= ttlv_len;
|
|
break;
|
|
}
|
|
}
|
|
return plen + 2;
|
|
} else {
|
|
/* complain bitterly ? */
|
|
/* fall through */
|
|
goto trunc;
|
|
}
|
|
|
|
trunc:
|
|
return -2;
|
|
}
|
|
|
|
int
|
|
decode_prefix6(netdissect_options *ndo,
|
|
const u_char *pd, u_int itemlen, char *buf, size_t buflen)
|
|
{
|
|
nd_ipv6 addr;
|
|
u_int plen, plenbytes;
|
|
|
|
ITEMCHECK(1);
|
|
plen = GET_U_1(pd);
|
|
if (128 < plen)
|
|
return -1;
|
|
itemlen -= 1;
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
plenbytes = (plen + 7) / 8;
|
|
ITEMCHECK(plenbytes);
|
|
GET_CPY_BYTES(&addr, pd + 1, plenbytes);
|
|
if (plen % 8) {
|
|
addr[plenbytes - 1] &=
|
|
((0xff00 >> (plen % 8)) & 0xff);
|
|
}
|
|
snprintf(buf, buflen, "%s/%u", ip6addr_string(ndo, (const u_char *)&addr), plen);
|
|
return 1 + plenbytes;
|
|
|
|
badtlv:
|
|
return -2;
|
|
}
|
|
|
|
static int
|
|
decode_labeled_prefix6(netdissect_options *ndo,
|
|
const u_char *pptr, u_int itemlen, char *buf, size_t buflen)
|
|
{
|
|
nd_ipv6 addr;
|
|
u_int plen, plenbytes;
|
|
|
|
/* prefix length and label = 4 bytes */
|
|
ND_TCHECK_4(pptr);
|
|
ITEMCHECK(4);
|
|
plen = GET_U_1(pptr); /* get prefix length */
|
|
|
|
if (24 > plen)
|
|
return -1;
|
|
|
|
plen -= 24; /* adjust prefixlen - labellength */
|
|
|
|
if (128 < plen)
|
|
return -1;
|
|
itemlen -= 4;
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
plenbytes = (plen + 7) / 8;
|
|
GET_CPY_BYTES(&addr, pptr + 4, plenbytes);
|
|
if (plen % 8) {
|
|
addr[plenbytes - 1] &=
|
|
((0xff00 >> (plen % 8)) & 0xff);
|
|
}
|
|
/* the label may get offsetted by 4 bits so lets shift it right */
|
|
snprintf(buf, buflen, "%s/%u, label:%u %s",
|
|
ip6addr_string(ndo, (const u_char *)&addr),
|
|
plen,
|
|
GET_BE_U_3(pptr + 1)>>4,
|
|
((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
|
|
|
|
return 4 + plenbytes;
|
|
|
|
trunc:
|
|
return -2;
|
|
|
|
badtlv:
|
|
return -3;
|
|
}
|
|
|
|
static int
|
|
decode_labeled_vpn_prefix6(netdissect_options *ndo,
|
|
const u_char *pptr, char *buf, size_t buflen)
|
|
{
|
|
nd_ipv6 addr;
|
|
u_int plen;
|
|
|
|
plen = GET_U_1(pptr); /* get prefix length */
|
|
|
|
if ((24+64) > plen)
|
|
return -1;
|
|
|
|
plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
|
|
|
|
if (128 < plen)
|
|
return -1;
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
|
|
if (plen % 8) {
|
|
addr[(plen + 7) / 8 - 1] &=
|
|
((0xff00 >> (plen % 8)) & 0xff);
|
|
}
|
|
/* the label may get offsetted by 4 bits so lets shift it right */
|
|
snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
|
|
bgp_vpn_rd_print(ndo, pptr+4),
|
|
ip6addr_string(ndo, (const u_char *)&addr),
|
|
plen,
|
|
GET_BE_U_3(pptr + 1)>>4,
|
|
((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
|
|
|
|
return 12 + (plen + 7) / 8;
|
|
}
|
|
|
|
static int
|
|
decode_clnp_prefix(netdissect_options *ndo,
|
|
const u_char *pptr, char *buf, size_t buflen)
|
|
{
|
|
uint8_t addr[19];
|
|
u_int plen;
|
|
|
|
plen = GET_U_1(pptr); /* get prefix length */
|
|
|
|
if (152 < plen)
|
|
return -1;
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
GET_CPY_BYTES(&addr, pptr + 4, (plen + 7) / 8);
|
|
if (plen % 8) {
|
|
addr[(plen + 7) / 8 - 1] &=
|
|
((0xff00 >> (plen % 8)) & 0xff);
|
|
}
|
|
/* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */
|
|
snprintf(buf, buflen, "%s/%u",
|
|
isonsap_string(ndo, addr,(plen + 7) / 8),
|
|
plen);
|
|
|
|
return 1 + (plen + 7) / 8;
|
|
}
|
|
|
|
static int
|
|
decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
|
|
const u_char *pptr, char *buf, size_t buflen)
|
|
{
|
|
uint8_t addr[19];
|
|
u_int plen;
|
|
|
|
plen = GET_U_1(pptr); /* get prefix length */
|
|
|
|
if ((24+64) > plen)
|
|
return -1;
|
|
|
|
plen -= (24+64); /* adjust prefixlen - labellength - RD len*/
|
|
|
|
if (152 < plen)
|
|
return -1;
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
|
|
if (plen % 8) {
|
|
addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
|
|
}
|
|
/* the label may get offsetted by 4 bits so lets shift it right */
|
|
/* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */
|
|
snprintf(buf, buflen, "RD: %s, %s/%u, label:%u %s",
|
|
bgp_vpn_rd_print(ndo, pptr+4),
|
|
isonsap_string(ndo, addr,(plen + 7) / 8),
|
|
plen,
|
|
GET_BE_U_3(pptr + 1)>>4,
|
|
((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
|
|
|
|
return 12 + (plen + 7) / 8;
|
|
}
|
|
|
|
/*
|
|
* bgp_attr_get_as_size
|
|
*
|
|
* Try to find the size of the ASs encoded in an as-path. It is not obvious, as
|
|
* both Old speakers that do not support 4 byte AS, and the new speakers that do
|
|
* support, exchange AS-Path with the same path-attribute type value 0x02.
|
|
*/
|
|
static u_int
|
|
bgp_attr_get_as_size(netdissect_options *ndo,
|
|
uint8_t bgpa_type, const u_char *pptr, u_int len)
|
|
{
|
|
const u_char *tptr = pptr;
|
|
|
|
/*
|
|
* If the path attribute is the optional AS4 path type, then we already
|
|
* know, that ASs must be encoded in 4 byte format.
|
|
*/
|
|
if (bgpa_type == BGPTYPE_AS4_PATH) {
|
|
return 4;
|
|
}
|
|
|
|
/*
|
|
* Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
|
|
* TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
|
|
* each.
|
|
*/
|
|
while (tptr < pptr + len) {
|
|
/*
|
|
* If we do not find a valid segment type, our guess might be wrong.
|
|
*/
|
|
if (GET_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || GET_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) {
|
|
goto trunc;
|
|
}
|
|
tptr += 2 + GET_U_1(tptr + 1) * 2;
|
|
}
|
|
|
|
/*
|
|
* If we correctly reached end of the AS path attribute data content,
|
|
* then most likely ASs were indeed encoded as 2 bytes.
|
|
*/
|
|
if (tptr == pptr + len) {
|
|
return 2;
|
|
}
|
|
|
|
trunc:
|
|
|
|
/*
|
|
* We can come here, either we did not have enough data, or if we
|
|
* try to decode 4 byte ASs in 2 byte format. Either way, return 4,
|
|
* so that calller can try to decode each AS as of 4 bytes. If indeed
|
|
* there was not enough data, it will crib and end the parse anyways.
|
|
*/
|
|
return 4;
|
|
}
|
|
|
|
/*
|
|
* The only way to know that a BGP UPDATE message is using add path is
|
|
* by checking if the capability is in the OPEN message which we may have missed.
|
|
* So this function checks if it is possible that the update could contain add path
|
|
* and if so it checks that standard BGP doesn't make sense.
|
|
*/
|
|
static int
|
|
check_add_path(netdissect_options *ndo, const u_char *pptr, u_int length,
|
|
u_int max_prefix_length)
|
|
{
|
|
u_int offset, prefix_length;
|
|
|
|
if (length < 5) {
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Scan through the NLRI information under the assumpetion that
|
|
* it doesn't have path IDs.
|
|
*/
|
|
for (offset = 0; offset < length;) {
|
|
offset += 4;
|
|
if (!ND_TTEST_1(pptr + offset)) {
|
|
/* We ran out of captured data; quit scanning. */
|
|
break;
|
|
}
|
|
prefix_length = GET_U_1(pptr + offset);
|
|
/*
|
|
* Add 4 to cover the path id
|
|
* and check the prefix length isn't greater than 32/128.
|
|
*/
|
|
if (prefix_length > max_prefix_length) {
|
|
return 0;
|
|
}
|
|
/* Add 1 for the prefix_length byte and prefix_length to cover the address */
|
|
offset += 1 + ((prefix_length + 7) / 8);
|
|
}
|
|
/* check we haven't gone past the end of the section */
|
|
if (offset > length) {
|
|
return 0;
|
|
}
|
|
|
|
/* check it's not standard BGP */
|
|
for (offset = 0; offset < length; ) {
|
|
if (!ND_TTEST_1(pptr + offset)) {
|
|
/* We ran out of captured data; quit scanning. */
|
|
break;
|
|
}
|
|
prefix_length = GET_U_1(pptr + offset);
|
|
/*
|
|
* If the prefix_length is zero (0.0.0.0/0)
|
|
* and since it's not the only address (length >= 5)
|
|
* then it is add-path
|
|
*/
|
|
if (prefix_length < 1 || prefix_length > max_prefix_length) {
|
|
return 1;
|
|
}
|
|
offset += 1 + ((prefix_length + 7) / 8);
|
|
}
|
|
if (offset > length) {
|
|
return 1;
|
|
}
|
|
|
|
/* assume not add-path by default */
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
bgp_mp_af_print(netdissect_options *ndo,
|
|
const u_char *tptr, u_int tlen,
|
|
uint16_t *afp, uint8_t *safip)
|
|
{
|
|
uint16_t af;
|
|
uint8_t safi;
|
|
|
|
af = GET_BE_U_2(tptr);
|
|
*afp = af;
|
|
safi = GET_U_1(tptr + 2);
|
|
*safip = safi;
|
|
|
|
ND_PRINT("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
|
|
tok2str(af_values, "Unknown AFI", af),
|
|
af,
|
|
(safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
|
|
tok2str(bgp_safi_values, "Unknown SAFI", safi),
|
|
safi);
|
|
|
|
switch(af<<8 | safi) {
|
|
case (AFNUM_INET<<8 | SAFNUM_UNICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
|
|
case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
|
|
case (AFNUM_INET<<8 | SAFNUM_MDT):
|
|
case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
|
|
case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
|
|
case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
|
|
case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
|
|
case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
|
|
case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
|
|
case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
|
|
case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
|
|
case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
|
|
case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
|
|
case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
|
|
case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
|
|
case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
|
|
case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
|
|
case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
|
|
case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
|
|
case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
|
|
break;
|
|
default:
|
|
ND_TCHECK_LEN(tptr, tlen);
|
|
ND_PRINT("\n\t no AFI %u / SAFI %u decoder", af, safi);
|
|
if (ndo->ndo_vflag <= 1)
|
|
print_unknown_data(ndo, tptr, "\n\t ", tlen);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
trunc:
|
|
return -2;
|
|
}
|
|
|
|
static int
|
|
bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi,
|
|
const u_char *tptr, u_int len,
|
|
char *buf, size_t buflen,
|
|
int add_path4, int add_path6)
|
|
{
|
|
int advance;
|
|
u_int path_id = 0;
|
|
|
|
switch (af<<8 | safi) {
|
|
case (AFNUM_INET<<8 | SAFNUM_UNICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
|
|
if (add_path4) {
|
|
path_id = GET_BE_U_4(tptr);
|
|
tptr += 4;
|
|
}
|
|
advance = decode_prefix4(ndo, tptr, len, buf, buflen);
|
|
if (advance == -1)
|
|
ND_PRINT("\n\t (illegal prefix length)");
|
|
else if (advance == -2)
|
|
break; /* bytes left, but not enough */
|
|
else
|
|
ND_PRINT("\n\t %s", buf);
|
|
if (add_path4) {
|
|
ND_PRINT(" Path Id: %u", path_id);
|
|
advance += 4;
|
|
}
|
|
break;
|
|
case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
|
|
advance = decode_labeled_prefix4(ndo, tptr, len, buf, buflen);
|
|
if (advance == -1)
|
|
ND_PRINT("\n\t (illegal prefix length)");
|
|
else if (advance == -2)
|
|
goto trunc;
|
|
else if (advance == -3)
|
|
break; /* bytes left, but not enough */
|
|
else
|
|
ND_PRINT("\n\t %s", buf);
|
|
break;
|
|
case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
|
|
advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, buflen);
|
|
if (advance == -1)
|
|
ND_PRINT("\n\t (illegal prefix length)");
|
|
else
|
|
ND_PRINT("\n\t %s", buf);
|
|
break;
|
|
case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
|
|
advance = decode_rt_routing_info(ndo, tptr);
|
|
break;
|
|
case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
|
|
case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
|
|
advance = decode_multicast_vpn(ndo, tptr, buf, buflen);
|
|
if (advance == -1)
|
|
ND_PRINT("\n\t (illegal prefix length)");
|
|
else if (advance == -2)
|
|
goto trunc;
|
|
else
|
|
ND_PRINT("\n\t %s", buf);
|
|
break;
|
|
|
|
case (AFNUM_INET<<8 | SAFNUM_MDT):
|
|
advance = decode_mdt_vpn_nlri(ndo, tptr, buf, buflen);
|
|
if (advance == -1)
|
|
ND_PRINT("\n\t (illegal prefix length)");
|
|
else if (advance == -2)
|
|
goto trunc;
|
|
else
|
|
ND_PRINT("\n\t %s", buf);
|
|
break;
|
|
case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
|
|
case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
|
|
case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
|
|
if (add_path6) {
|
|
path_id = GET_BE_U_4(tptr);
|
|
tptr += 4;
|
|
}
|
|
advance = decode_prefix6(ndo, tptr, len, buf, buflen);
|
|
if (advance == -1)
|
|
ND_PRINT("\n\t (illegal prefix length)");
|
|
else if (advance == -2)
|
|
break; /* bytes left, but not enough */
|
|
else
|
|
ND_PRINT("\n\t %s", buf);
|
|
if (add_path6) {
|
|
ND_PRINT(" Path Id: %u", path_id);
|
|
advance += 4;
|
|
}
|
|
break;
|
|
case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
|
|
advance = decode_labeled_prefix6(ndo, tptr, len, buf, buflen);
|
|
if (advance == -1)
|
|
ND_PRINT("\n\t (illegal prefix length)");
|
|
else if (advance == -2)
|
|
goto trunc;
|
|
else if (advance == -3)
|
|
break; /* bytes left, but not enough */
|
|
else
|
|
ND_PRINT("\n\t %s", buf);
|
|
break;
|
|
case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
|
|
case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
|
|
case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
|
|
advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, buflen);
|
|
if (advance == -1)
|
|
ND_PRINT("\n\t (illegal prefix length)");
|
|
else
|
|
ND_PRINT("\n\t %s", buf);
|
|
break;
|
|
case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
|
|
case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
|
|
case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
|
|
case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
|
|
advance = decode_labeled_vpn_l2(ndo, tptr, buf, buflen);
|
|
if (advance == -1)
|
|
ND_PRINT("\n\t (illegal length)");
|
|
else if (advance == -2)
|
|
goto trunc;
|
|
else
|
|
ND_PRINT("\n\t %s", buf);
|
|
break;
|
|
case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
|
|
case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
|
|
case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
|
|
advance = decode_clnp_prefix(ndo, tptr, buf, buflen);
|
|
if (advance == -1)
|
|
ND_PRINT("\n\t (illegal prefix length)");
|
|
else
|
|
ND_PRINT("\n\t %s", buf);
|
|
break;
|
|
case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
|
|
case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
|
|
case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
|
|
advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, buflen);
|
|
if (advance == -1)
|
|
ND_PRINT("\n\t (illegal prefix length)");
|
|
else
|
|
ND_PRINT("\n\t %s", buf);
|
|
break;
|
|
default:
|
|
/*
|
|
* This should not happen, we should have been protected
|
|
* by bgp_mp_af_print()'s return value.
|
|
*/
|
|
ND_PRINT("\n\t ERROR: no AFI %u / SAFI %u decoder", af, safi);
|
|
advance = -4;
|
|
break;
|
|
}
|
|
return advance;
|
|
trunc: /* we rely on the caller to recognize -2 return value */
|
|
return -2;
|
|
}
|
|
|
|
static int
|
|
bgp_attr_print(netdissect_options *ndo,
|
|
uint8_t atype, const u_char *pptr, u_int len,
|
|
const unsigned attr_set_level)
|
|
{
|
|
/* allocate space for the largest possible string */
|
|
char astostr[AS_STR_SIZE];
|
|
u_int i;
|
|
uint16_t af;
|
|
uint8_t safi, snpa, nhlen;
|
|
int advance;
|
|
u_int tlen;
|
|
const u_char *tptr;
|
|
char buf[MAXHOSTNAMELEN + 100];
|
|
u_int as_size;
|
|
int add_path4, add_path6;
|
|
int ret;
|
|
|
|
tptr = pptr;
|
|
tlen = len;
|
|
|
|
switch (atype) {
|
|
case BGPTYPE_ORIGIN:
|
|
if (len != 1)
|
|
ND_PRINT("invalid len");
|
|
else {
|
|
ND_PRINT("%s", tok2str(bgp_origin_values,
|
|
"Unknown Origin Typecode",
|
|
GET_U_1(tptr)));
|
|
}
|
|
break;
|
|
|
|
/*
|
|
* Process AS4 byte path and AS2 byte path attributes here.
|
|
*/
|
|
case BGPTYPE_AS4_PATH:
|
|
case BGPTYPE_AS_PATH:
|
|
if (len % 2) {
|
|
ND_PRINT("invalid len");
|
|
break;
|
|
}
|
|
if (!len) {
|
|
ND_PRINT("empty");
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* BGP updates exchanged between New speakers that support 4
|
|
* byte AS, ASs are always encoded in 4 bytes. There is no
|
|
* definitive way to find this, just by the packet's
|
|
* contents. So, check for packet's TLV's sanity assuming
|
|
* 2 bytes first, and it does not pass, assume that ASs are
|
|
* encoded in 4 bytes format and move on.
|
|
*/
|
|
as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
|
|
|
|
while (tptr < pptr + len) {
|
|
ND_PRINT("%s", tok2str(bgp_as_path_segment_open_values,
|
|
"?", GET_U_1(tptr)));
|
|
for (i = 0; i < GET_U_1(tptr + 1) * as_size; i += as_size) {
|
|
ND_TCHECK_LEN(tptr + 2 + i, as_size);
|
|
ND_PRINT("%s ",
|
|
as_printf(ndo, astostr, sizeof(astostr),
|
|
as_size == 2 ?
|
|
GET_BE_U_2(tptr + i + 2) :
|
|
GET_BE_U_4(tptr + i + 2)));
|
|
}
|
|
ND_PRINT("%s", tok2str(bgp_as_path_segment_close_values,
|
|
"?", GET_U_1(tptr)));
|
|
tptr += 2 + GET_U_1(tptr + 1) * as_size;
|
|
}
|
|
break;
|
|
case BGPTYPE_NEXT_HOP:
|
|
if (len != 4)
|
|
ND_PRINT("invalid len");
|
|
else {
|
|
ND_PRINT("%s", GET_IPADDR_STRING(tptr));
|
|
}
|
|
break;
|
|
case BGPTYPE_MULTI_EXIT_DISC:
|
|
case BGPTYPE_LOCAL_PREF:
|
|
if (len != 4)
|
|
ND_PRINT("invalid len");
|
|
else {
|
|
ND_PRINT("%u", GET_BE_U_4(tptr));
|
|
}
|
|
break;
|
|
case BGPTYPE_ATOMIC_AGGREGATE:
|
|
if (len != 0)
|
|
ND_PRINT("invalid len");
|
|
break;
|
|
case BGPTYPE_AGGREGATOR:
|
|
|
|
/*
|
|
* Depending on the AS encoded is of 2 bytes or of 4 bytes,
|
|
* the length of this PA can be either 6 bytes or 8 bytes.
|
|
*/
|
|
if (len != 6 && len != 8) {
|
|
ND_PRINT("invalid len");
|
|
break;
|
|
}
|
|
ND_TCHECK_LEN(tptr, len);
|
|
if (len == 6) {
|
|
ND_PRINT(" AS #%s, origin %s",
|
|
as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(tptr)),
|
|
GET_IPADDR_STRING(tptr + 2));
|
|
} else {
|
|
ND_PRINT(" AS #%s, origin %s",
|
|
as_printf(ndo, astostr, sizeof(astostr),
|
|
GET_BE_U_4(tptr)), GET_IPADDR_STRING(tptr + 4));
|
|
}
|
|
break;
|
|
case BGPTYPE_AGGREGATOR4:
|
|
if (len != 8) {
|
|
ND_PRINT("invalid len");
|
|
break;
|
|
}
|
|
ND_PRINT(" AS #%s, origin %s",
|
|
as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)),
|
|
GET_IPADDR_STRING(tptr + 4));
|
|
break;
|
|
case BGPTYPE_COMMUNITIES:
|
|
if (len % 4) {
|
|
ND_PRINT("invalid len");
|
|
break;
|
|
}
|
|
while (tlen != 0) {
|
|
uint32_t comm;
|
|
ND_TCHECK_4(tptr);
|
|
if (tlen < 4)
|
|
goto trunc;
|
|
comm = GET_BE_U_4(tptr);
|
|
switch (comm) {
|
|
case BGP_COMMUNITY_NO_EXPORT:
|
|
ND_PRINT(" NO_EXPORT");
|
|
break;
|
|
case BGP_COMMUNITY_NO_ADVERT:
|
|
ND_PRINT(" NO_ADVERTISE");
|
|
break;
|
|
case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
|
|
ND_PRINT(" NO_EXPORT_SUBCONFED");
|
|
break;
|
|
default:
|
|
ND_PRINT("%u:%u%s",
|
|
(comm >> 16) & 0xffff,
|
|
comm & 0xffff,
|
|
(tlen>4) ? ", " : "");
|
|
break;
|
|
}
|
|
tlen -=4;
|
|
tptr +=4;
|
|
}
|
|
break;
|
|
case BGPTYPE_ORIGINATOR_ID:
|
|
if (len != 4) {
|
|
ND_PRINT("invalid len");
|
|
break;
|
|
}
|
|
ND_PRINT("%s",GET_IPADDR_STRING(tptr));
|
|
break;
|
|
case BGPTYPE_CLUSTER_LIST:
|
|
if (len % 4) {
|
|
ND_PRINT("invalid len");
|
|
break;
|
|
}
|
|
while (tlen != 0) {
|
|
if (tlen < 4)
|
|
goto trunc;
|
|
ND_PRINT("%s%s",
|
|
GET_IPADDR_STRING(tptr),
|
|
(tlen>4) ? ", " : "");
|
|
tlen -=4;
|
|
tptr +=4;
|
|
}
|
|
break;
|
|
case BGPTYPE_MP_REACH_NLRI:
|
|
ND_TCHECK_3(tptr);
|
|
if (tlen < 3)
|
|
goto trunc;
|
|
ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
|
|
if (ret == -2)
|
|
goto trunc;
|
|
if (ret < 0)
|
|
break;
|
|
|
|
tptr += 3;
|
|
tlen -= 3;
|
|
|
|
ND_TCHECK_1(tptr);
|
|
if (tlen < 1)
|
|
goto trunc;
|
|
nhlen = GET_U_1(tptr);
|
|
tptr++;
|
|
tlen--;
|
|
|
|
if (nhlen) {
|
|
u_int nnh = 0;
|
|
uint8_t tnhlen = nhlen;
|
|
if (tlen < tnhlen)
|
|
goto trunc;
|
|
ND_PRINT("\n\t nexthop: ");
|
|
while (tnhlen != 0) {
|
|
if (nnh++ > 0) {
|
|
ND_PRINT(", " );
|
|
}
|
|
switch(af<<8 | safi) {
|
|
case (AFNUM_INET<<8 | SAFNUM_UNICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
|
|
case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
|
|
case (AFNUM_INET<<8 | SAFNUM_MDT):
|
|
if (tnhlen < sizeof(nd_ipv4)) {
|
|
ND_PRINT("invalid len");
|
|
tptr += tnhlen;
|
|
tlen -= tnhlen;
|
|
tnhlen = 0;
|
|
} else {
|
|
ND_PRINT("%s",GET_IPADDR_STRING(tptr));
|
|
tptr += sizeof(nd_ipv4);
|
|
tnhlen -= sizeof(nd_ipv4);
|
|
tlen -= sizeof(nd_ipv4);
|
|
}
|
|
break;
|
|
case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
|
|
case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
|
|
if (tnhlen < sizeof(nd_ipv4)+BGP_VPN_RD_LEN) {
|
|
ND_PRINT("invalid len");
|
|
tptr += tnhlen;
|
|
tlen -= tnhlen;
|
|
tnhlen = 0;
|
|
} else {
|
|
ND_PRINT("RD: %s, %s",
|
|
bgp_vpn_rd_print(ndo, tptr),
|
|
GET_IPADDR_STRING(tptr+BGP_VPN_RD_LEN));
|
|
tptr += (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
|
|
tlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
|
|
tnhlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN);
|
|
}
|
|
break;
|
|
case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
|
|
case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
|
|
case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
|
|
case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
|
|
if (tnhlen < sizeof(nd_ipv6)) {
|
|
ND_PRINT("invalid len");
|
|
tptr += tnhlen;
|
|
tlen -= tnhlen;
|
|
tnhlen = 0;
|
|
} else {
|
|
ND_PRINT("%s", GET_IP6ADDR_STRING(tptr));
|
|
tptr += sizeof(nd_ipv6);
|
|
tlen -= sizeof(nd_ipv6);
|
|
tnhlen -= sizeof(nd_ipv6);
|
|
}
|
|
break;
|
|
case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
|
|
case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
|
|
case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
|
|
if (tnhlen < sizeof(nd_ipv6)+BGP_VPN_RD_LEN) {
|
|
ND_PRINT("invalid len");
|
|
tptr += tnhlen;
|
|
tlen -= tnhlen;
|
|
tnhlen = 0;
|
|
} else {
|
|
ND_PRINT("RD: %s, %s",
|
|
bgp_vpn_rd_print(ndo, tptr),
|
|
GET_IP6ADDR_STRING(tptr+BGP_VPN_RD_LEN));
|
|
tptr += (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
|
|
tlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
|
|
tnhlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN);
|
|
}
|
|
break;
|
|
case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
|
|
case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
|
|
case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
|
|
case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
|
|
if (tnhlen < sizeof(nd_ipv4)) {
|
|
ND_PRINT("invalid len");
|
|
tptr += tnhlen;
|
|
tlen -= tnhlen;
|
|
tnhlen = 0;
|
|
} else {
|
|
ND_PRINT("%s", GET_IPADDR_STRING(tptr));
|
|
tptr += (sizeof(nd_ipv4));
|
|
tlen -= (sizeof(nd_ipv4));
|
|
tnhlen -= (sizeof(nd_ipv4));
|
|
}
|
|
break;
|
|
case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
|
|
case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
|
|
case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
|
|
ND_PRINT("%s", GET_ISONSAP_STRING(tptr, tnhlen));
|
|
tptr += tnhlen;
|
|
tlen -= tnhlen;
|
|
tnhlen = 0;
|
|
break;
|
|
|
|
case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
|
|
case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
|
|
case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
|
|
if (tnhlen < BGP_VPN_RD_LEN+1) {
|
|
ND_PRINT("invalid len");
|
|
tptr += tnhlen;
|
|
tlen -= tnhlen;
|
|
tnhlen = 0;
|
|
} else {
|
|
ND_TCHECK_LEN(tptr, tnhlen);
|
|
ND_PRINT("RD: %s, %s",
|
|
bgp_vpn_rd_print(ndo, tptr),
|
|
GET_ISONSAP_STRING(tptr+BGP_VPN_RD_LEN,tnhlen-BGP_VPN_RD_LEN));
|
|
/* rfc986 mapped IPv4 address ? */
|
|
if (GET_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601)
|
|
ND_PRINT(" = %s", GET_IPADDR_STRING(tptr+BGP_VPN_RD_LEN+4));
|
|
/* rfc1888 mapped IPv6 address ? */
|
|
else if (GET_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000)
|
|
ND_PRINT(" = %s", GET_IP6ADDR_STRING(tptr+BGP_VPN_RD_LEN+3));
|
|
tptr += tnhlen;
|
|
tlen -= tnhlen;
|
|
tnhlen = 0;
|
|
}
|
|
break;
|
|
default:
|
|
/*
|
|
* bgp_mp_af_print() should have saved us from
|
|
* an unsupported AFI/SAFI.
|
|
*/
|
|
ND_PRINT("ERROR: no AFI %u/SAFI %u nexthop decoder", af, safi);
|
|
tptr += tnhlen;
|
|
tlen -= tnhlen;
|
|
tnhlen = 0;
|
|
goto done;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
ND_PRINT(", nh-length: %u", nhlen);
|
|
|
|
/* As per RFC 2858; this is reserved in RFC 4760 */
|
|
if (tlen < 1)
|
|
goto trunc;
|
|
snpa = GET_U_1(tptr);
|
|
tptr++;
|
|
tlen--;
|
|
|
|
if (snpa) {
|
|
ND_PRINT("\n\t %u SNPA", snpa);
|
|
for (/*nothing*/; snpa != 0; snpa--) {
|
|
uint8_t snpalen;
|
|
if (tlen < 1)
|
|
goto trunc;
|
|
snpalen = GET_U_1(tptr);
|
|
ND_PRINT("\n\t %u bytes", snpalen);
|
|
tptr++;
|
|
tlen--;
|
|
if (tlen < snpalen)
|
|
goto trunc;
|
|
ND_TCHECK_LEN(tptr, snpalen);
|
|
tptr += snpalen;
|
|
tlen -= snpalen;
|
|
}
|
|
} else {
|
|
ND_PRINT(", no SNPA");
|
|
}
|
|
|
|
add_path4 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 32);
|
|
add_path6 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 128);
|
|
|
|
while (tptr < pptr + len) {
|
|
advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf),
|
|
add_path4, add_path6);
|
|
if (advance == -2)
|
|
goto trunc;
|
|
if (advance < 0)
|
|
break;
|
|
tptr += advance;
|
|
}
|
|
break;
|
|
|
|
case BGPTYPE_MP_UNREACH_NLRI:
|
|
ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE);
|
|
ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi);
|
|
if (ret == -2)
|
|
goto trunc;
|
|
if (ret < 0)
|
|
break;
|
|
|
|
if (len == BGP_MP_NLRI_MINSIZE)
|
|
ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
|
|
|
|
tptr += 3;
|
|
|
|
add_path4 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 32);
|
|
add_path6 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 128);
|
|
|
|
while (tptr < pptr + len) {
|
|
advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf),
|
|
add_path4, add_path6);
|
|
if (advance == -2)
|
|
goto trunc;
|
|
if (advance < 0)
|
|
break;
|
|
tptr += advance;
|
|
}
|
|
break;
|
|
case BGPTYPE_EXTD_COMMUNITIES:
|
|
if (len % 8) {
|
|
ND_PRINT("invalid len");
|
|
break;
|
|
}
|
|
while (tlen != 0) {
|
|
uint16_t extd_comm;
|
|
|
|
ND_TCHECK_2(tptr);
|
|
if (tlen < 2)
|
|
goto trunc;
|
|
extd_comm=GET_BE_U_2(tptr);
|
|
|
|
ND_PRINT("\n\t %s (0x%04x), Flags [%s]",
|
|
tok2str(bgp_extd_comm_subtype_values,
|
|
"unknown extd community typecode",
|
|
extd_comm),
|
|
extd_comm,
|
|
bittok2str(bgp_extd_comm_flag_values, "none", extd_comm));
|
|
|
|
ND_TCHECK_8(tptr);
|
|
if (tlen < 8)
|
|
goto trunc;
|
|
ND_PRINT(": ");
|
|
bgp_extended_community_print(ndo, tptr);
|
|
tlen -= 8;
|
|
tptr += 8;
|
|
}
|
|
break;
|
|
|
|
case BGPTYPE_PMSI_TUNNEL:
|
|
{
|
|
uint8_t tunnel_type, flags;
|
|
|
|
ND_TCHECK_5(tptr);
|
|
if (tlen < 5)
|
|
goto trunc;
|
|
flags = GET_U_1(tptr);
|
|
tunnel_type = GET_U_1(tptr + 1);
|
|
|
|
ND_PRINT("\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
|
|
tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
|
|
tunnel_type,
|
|
bittok2str(bgp_pmsi_flag_values, "none", flags),
|
|
GET_BE_U_3(tptr + 2)>>4);
|
|
|
|
tptr +=5;
|
|
tlen -= 5;
|
|
|
|
switch (tunnel_type) {
|
|
case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
|
|
case BGP_PMSI_TUNNEL_PIM_BIDIR:
|
|
ND_PRINT("\n\t Sender %s, P-Group %s",
|
|
GET_IPADDR_STRING(tptr),
|
|
GET_IPADDR_STRING(tptr+4));
|
|
break;
|
|
|
|
case BGP_PMSI_TUNNEL_PIM_SSM:
|
|
ND_PRINT("\n\t Root-Node %s, P-Group %s",
|
|
GET_IPADDR_STRING(tptr),
|
|
GET_IPADDR_STRING(tptr+4));
|
|
break;
|
|
case BGP_PMSI_TUNNEL_INGRESS:
|
|
ND_PRINT("\n\t Tunnel-Endpoint %s",
|
|
GET_IPADDR_STRING(tptr));
|
|
break;
|
|
case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
|
|
case BGP_PMSI_TUNNEL_LDP_MP2MP:
|
|
ND_PRINT("\n\t Root-Node %s, LSP-ID 0x%08x",
|
|
GET_IPADDR_STRING(tptr),
|
|
GET_BE_U_4(tptr + 4));
|
|
break;
|
|
case BGP_PMSI_TUNNEL_RSVP_P2MP:
|
|
ND_PRINT("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
|
|
GET_IPADDR_STRING(tptr),
|
|
GET_BE_U_4(tptr + 4));
|
|
break;
|
|
default:
|
|
if (ndo->ndo_vflag <= 1) {
|
|
print_unknown_data(ndo, tptr, "\n\t ", tlen);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case BGPTYPE_AIGP:
|
|
{
|
|
uint8_t type;
|
|
uint16_t length;
|
|
|
|
while (tlen >= 3) {
|
|
type = GET_U_1(tptr);
|
|
length = GET_BE_U_2(tptr + 1);
|
|
tptr += 3;
|
|
tlen -= 3;
|
|
|
|
ND_PRINT("\n\t %s TLV (%u), length %u",
|
|
tok2str(bgp_aigp_values, "Unknown", type),
|
|
type, length);
|
|
|
|
if (length < 3)
|
|
goto trunc;
|
|
length -= 3;
|
|
|
|
/*
|
|
* Check if we can read the TLV data.
|
|
*/
|
|
if (tlen < length)
|
|
goto trunc;
|
|
|
|
switch (type) {
|
|
|
|
case BGP_AIGP_TLV:
|
|
if (length < 8)
|
|
goto trunc;
|
|
ND_PRINT(", metric %" PRIu64,
|
|
GET_BE_U_8(tptr));
|
|
break;
|
|
|
|
default:
|
|
if (ndo->ndo_vflag <= 1) {
|
|
print_unknown_data(ndo, tptr,"\n\t ", length);
|
|
}
|
|
}
|
|
|
|
tptr += length;
|
|
tlen -= length;
|
|
}
|
|
break;
|
|
}
|
|
case BGPTYPE_ATTR_SET:
|
|
ND_TCHECK_4(tptr);
|
|
if (len < 4)
|
|
goto trunc;
|
|
ND_PRINT("\n\t Origin AS: %s",
|
|
as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)));
|
|
tptr += 4;
|
|
len -= 4;
|
|
|
|
while (len) {
|
|
u_int aflags, alenlen, alen;
|
|
|
|
ND_TCHECK_2(tptr);
|
|
if (len < 2) {
|
|
ND_PRINT(" [path attr too short]");
|
|
tptr += len;
|
|
break;
|
|
}
|
|
aflags = GET_U_1(tptr);
|
|
atype = GET_U_1(tptr + 1);
|
|
tptr += 2;
|
|
len -= 2;
|
|
alenlen = bgp_attr_lenlen(aflags, tptr);
|
|
ND_TCHECK_LEN(tptr, alenlen);
|
|
if (len < alenlen) {
|
|
ND_PRINT(" [path attr too short]");
|
|
tptr += len;
|
|
break;
|
|
}
|
|
alen = bgp_attr_len(aflags, tptr);
|
|
tptr += alenlen;
|
|
len -= alenlen;
|
|
|
|
ND_PRINT("\n\t %s (%u), length: %u",
|
|
tok2str(bgp_attr_values,
|
|
"Unknown Attribute", atype),
|
|
atype,
|
|
alen);
|
|
|
|
if (aflags) {
|
|
ND_PRINT(", Flags [%s%s%s%s",
|
|
aflags & 0x80 ? "O" : "",
|
|
aflags & 0x40 ? "T" : "",
|
|
aflags & 0x20 ? "P" : "",
|
|
aflags & 0x10 ? "E" : "");
|
|
if (aflags & 0xf)
|
|
ND_PRINT("+%x", aflags & 0xf);
|
|
ND_PRINT("]");
|
|
}
|
|
ND_PRINT(": ");
|
|
if (len < alen) {
|
|
ND_PRINT(" [path attr too short]");
|
|
tptr += len;
|
|
break;
|
|
}
|
|
/*
|
|
* The protocol encoding per se allows ATTR_SET to be nested
|
|
* as many times as the message can accommodate. This printer
|
|
* used to be able to recurse into ATTR_SET contents until the
|
|
* stack exhaustion, but now there is a limit on that (if live
|
|
* protocol exchange goes that many levels deep, something is
|
|
* probably wrong anyway). Feel free to refine this value if
|
|
* you can find the spec with respective normative text.
|
|
*/
|
|
if (attr_set_level == 10)
|
|
ND_PRINT("(too many nested levels, not recursing)");
|
|
else if (!bgp_attr_print(ndo, atype, tptr, alen, attr_set_level + 1))
|
|
return 0;
|
|
tptr += alen;
|
|
len -= alen;
|
|
}
|
|
break;
|
|
|
|
case BGPTYPE_LARGE_COMMUNITY:
|
|
if (len == 0 || len % 12) {
|
|
ND_PRINT("invalid len");
|
|
break;
|
|
}
|
|
ND_PRINT("\n\t ");
|
|
while (len != 0) {
|
|
ND_PRINT("%u:%u:%u%s",
|
|
GET_BE_U_4(tptr),
|
|
GET_BE_U_4(tptr + 4),
|
|
GET_BE_U_4(tptr + 8),
|
|
(len > 12) ? ", " : "");
|
|
tptr += 12;
|
|
/*
|
|
* len will always be a multiple of 12, as per the above,
|
|
* so this will never underflow.
|
|
*/
|
|
len -= 12;
|
|
}
|
|
break;
|
|
default:
|
|
ND_TCHECK_LEN(pptr, len);
|
|
ND_PRINT("\n\t no Attribute %u decoder", atype); /* we have no decoder for the attribute */
|
|
if (ndo->ndo_vflag <= 1)
|
|
print_unknown_data(ndo, pptr, "\n\t ", len);
|
|
break;
|
|
}
|
|
done:
|
|
if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
|
|
ND_TCHECK_LEN(pptr, len);
|
|
print_unknown_data(ndo, pptr, "\n\t ", len);
|
|
}
|
|
return 1;
|
|
|
|
trunc:
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
bgp_capabilities_print(netdissect_options *ndo,
|
|
const u_char *opt, u_int caps_len)
|
|
{
|
|
/* allocate space for the largest possible string */
|
|
char astostr[AS_STR_SIZE];
|
|
u_int cap_type, cap_len, tcap_len, cap_offset;
|
|
u_int i = 0;
|
|
|
|
while (i < caps_len) {
|
|
ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE);
|
|
cap_type=GET_U_1(opt + i);
|
|
cap_len=GET_U_1(opt + i + 1);
|
|
ND_PRINT("\n\t %s (%u), length: %u",
|
|
tok2str(bgp_capcode_values, "Unknown", cap_type),
|
|
cap_type,
|
|
cap_len);
|
|
ND_TCHECK_LEN(opt + 2 + i, cap_len);
|
|
switch (cap_type) {
|
|
case BGP_CAPCODE_MP:
|
|
/* AFI (16 bits), Reserved (8 bits), SAFI (8 bits) */
|
|
if (cap_len < 4) {
|
|
ND_PRINT(" (too short, < 4)");
|
|
return;
|
|
}
|
|
ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u)",
|
|
tok2str(af_values, "Unknown", GET_BE_U_2(opt + i + 2)),
|
|
GET_BE_U_2(opt + i + 2),
|
|
tok2str(bgp_safi_values, "Unknown", GET_U_1(opt + i + 5)),
|
|
GET_U_1(opt + i + 5));
|
|
break;
|
|
case BGP_CAPCODE_ML:
|
|
cap_offset = 2;
|
|
tcap_len = cap_len;
|
|
while (tcap_len >= 4) {
|
|
ND_PRINT( "\n\t\tAFI %s (%u), SAFI %s (%u), Count: %u",
|
|
tok2str(af_values, "Unknown",
|
|
GET_BE_U_2(opt + i + cap_offset)),
|
|
GET_BE_U_2(opt + i + cap_offset),
|
|
tok2str(bgp_safi_values, "Unknown",
|
|
GET_U_1(opt + i + cap_offset + 2)),
|
|
GET_U_1(opt + i + cap_offset + 2),
|
|
GET_U_1(opt + i + cap_offset + 3));
|
|
tcap_len -= 4;
|
|
cap_offset += 4;
|
|
}
|
|
break;
|
|
case BGP_CAPCODE_RESTART:
|
|
/* Restart Flags (4 bits), Restart Time in seconds (12 bits) */
|
|
if (cap_len < 2) {
|
|
ND_PRINT(" (too short, < 2)");
|
|
return;
|
|
}
|
|
tcap_len=cap_len;
|
|
ND_PRINT("\n\t\tRestart Flags: [%s], Restart Time %us",
|
|
((GET_U_1(opt + i + 2))&0x80) ? "R" : "none",
|
|
GET_BE_U_2(opt + i + 2)&0xfff);
|
|
tcap_len-=2;
|
|
cap_offset=4;
|
|
while(tcap_len>=4) {
|
|
ND_PRINT("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
|
|
tok2str(af_values,"Unknown",
|
|
GET_BE_U_2(opt + i + cap_offset)),
|
|
GET_BE_U_2(opt + i + cap_offset),
|
|
tok2str(bgp_safi_values,"Unknown",
|
|
GET_U_1(opt + i + cap_offset + 2)),
|
|
GET_U_1(opt + (i + cap_offset + 2)),
|
|
((GET_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" );
|
|
tcap_len -= 4;
|
|
cap_offset += 4;
|
|
}
|
|
break;
|
|
case BGP_CAPCODE_RR:
|
|
case BGP_CAPCODE_LLGR:
|
|
case BGP_CAPCODE_RR_CISCO:
|
|
break;
|
|
case BGP_CAPCODE_AS_NEW:
|
|
/*
|
|
* Extract the 4 byte AS number encoded.
|
|
*/
|
|
if (cap_len < 4) {
|
|
ND_PRINT(" (too short, < 4)");
|
|
return;
|
|
}
|
|
ND_PRINT("\n\t\t 4 Byte AS %s",
|
|
as_printf(ndo, astostr, sizeof(astostr),
|
|
GET_BE_U_4(opt + i + 2)));
|
|
break;
|
|
case BGP_CAPCODE_ADD_PATH:
|
|
if (cap_len == 0) {
|
|
ND_PRINT(" (bogus)"); /* length */
|
|
break;
|
|
}
|
|
tcap_len=cap_len;
|
|
cap_offset=2;
|
|
while (tcap_len != 0) {
|
|
if (tcap_len < 4) {
|
|
nd_print_invalid(ndo);
|
|
break;
|
|
}
|
|
ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
|
|
tok2str(af_values,"Unknown",GET_BE_U_2(opt + i + cap_offset)),
|
|
GET_BE_U_2(opt + i + cap_offset),
|
|
tok2str(bgp_safi_values,"Unknown",GET_U_1(opt + i + cap_offset + 2)),
|
|
GET_U_1(opt + (i + cap_offset + 2)),
|
|
tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",GET_U_1(opt + i + cap_offset + 3))
|
|
);
|
|
tcap_len -= 4;
|
|
cap_offset += 4;
|
|
}
|
|
break;
|
|
default:
|
|
ND_PRINT("\n\t\tno decoder for Capability %u",
|
|
cap_type);
|
|
if (ndo->ndo_vflag <= 1)
|
|
print_unknown_data(ndo, opt + i + 2, "\n\t\t",
|
|
cap_len);
|
|
break;
|
|
}
|
|
if (ndo->ndo_vflag > 1 && cap_len != 0) {
|
|
print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len);
|
|
}
|
|
i += BGP_CAP_HEADER_SIZE + cap_len;
|
|
}
|
|
return;
|
|
|
|
trunc:
|
|
nd_print_trunc(ndo);
|
|
}
|
|
|
|
static void
|
|
bgp_open_print(netdissect_options *ndo,
|
|
const u_char *dat, u_int length)
|
|
{
|
|
/* allocate space for the largest possible string */
|
|
char astostr[AS_STR_SIZE];
|
|
const struct bgp_open *bgp_open_header;
|
|
u_int optslen;
|
|
const struct bgp_opt *bgpopt;
|
|
const u_char *opt;
|
|
u_int i;
|
|
|
|
ND_TCHECK_LEN(dat, BGP_OPEN_SIZE);
|
|
if (length < BGP_OPEN_SIZE)
|
|
goto trunc;
|
|
|
|
bgp_open_header = (const struct bgp_open *)dat;
|
|
|
|
ND_PRINT("\n\t Version %u, ",
|
|
GET_U_1(bgp_open_header->bgpo_version));
|
|
ND_PRINT("my AS %s, ",
|
|
as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(bgp_open_header->bgpo_myas)));
|
|
ND_PRINT("Holdtime %us, ",
|
|
GET_BE_U_2(bgp_open_header->bgpo_holdtime));
|
|
ND_PRINT("ID %s", GET_IPADDR_STRING(bgp_open_header->bgpo_id));
|
|
optslen = GET_U_1(bgp_open_header->bgpo_optlen);
|
|
ND_PRINT("\n\t Optional parameters, length: %u", optslen);
|
|
|
|
opt = dat + BGP_OPEN_SIZE;
|
|
length -= BGP_OPEN_SIZE;
|
|
|
|
i = 0;
|
|
while (i < optslen) {
|
|
uint8_t opt_type, opt_len;
|
|
|
|
ND_TCHECK_LEN(opt + i, BGP_OPT_SIZE);
|
|
if (length < BGP_OPT_SIZE + i)
|
|
goto trunc;
|
|
bgpopt = (const struct bgp_opt *)(opt + i);
|
|
opt_type = GET_U_1(bgpopt->bgpopt_type);
|
|
opt_len = GET_U_1(bgpopt->bgpopt_len);
|
|
if (BGP_OPT_SIZE + i + opt_len > optslen) {
|
|
ND_PRINT("\n\t Option %u, length: %u, goes past the end of the options",
|
|
opt_type, opt_len);
|
|
break;
|
|
}
|
|
|
|
ND_PRINT("\n\t Option %s (%u), length: %u",
|
|
tok2str(bgp_opt_values,"Unknown",opt_type),
|
|
opt_type,
|
|
opt_len);
|
|
|
|
/* now let's decode the options we know*/
|
|
switch(opt_type) {
|
|
|
|
case BGP_OPT_CAP:
|
|
bgp_capabilities_print(ndo, opt + BGP_OPT_SIZE + i,
|
|
opt_len);
|
|
break;
|
|
|
|
case BGP_OPT_AUTH:
|
|
default:
|
|
ND_PRINT("\n\t no decoder for option %u",
|
|
opt_type);
|
|
break;
|
|
}
|
|
i += BGP_OPT_SIZE + opt_len;
|
|
}
|
|
return;
|
|
trunc:
|
|
nd_print_trunc(ndo);
|
|
}
|
|
|
|
static void
|
|
bgp_update_print(netdissect_options *ndo,
|
|
const u_char *dat, u_int length)
|
|
{
|
|
const u_char *p;
|
|
u_int withdrawn_routes_len;
|
|
char buf[MAXHOSTNAMELEN + 100];
|
|
int wpfx;
|
|
u_int len;
|
|
int i;
|
|
int add_path;
|
|
u_int path_id = 0;
|
|
|
|
ND_TCHECK_LEN(dat, BGP_SIZE);
|
|
if (length < BGP_SIZE)
|
|
goto trunc;
|
|
p = dat + BGP_SIZE;
|
|
length -= BGP_SIZE;
|
|
|
|
/* Unfeasible routes */
|
|
ND_TCHECK_2(p);
|
|
if (length < 2)
|
|
goto trunc;
|
|
withdrawn_routes_len = GET_BE_U_2(p);
|
|
p += 2;
|
|
length -= 2;
|
|
if (withdrawn_routes_len > 1) {
|
|
/*
|
|
* Without keeping state from the original NLRI message,
|
|
* it's not possible to tell if this a v4 or v6 route,
|
|
* so only try to decode it if we're not v6 enabled.
|
|
*/
|
|
ND_TCHECK_LEN(p, withdrawn_routes_len);
|
|
if (length < withdrawn_routes_len)
|
|
goto trunc;
|
|
ND_PRINT("\n\t Withdrawn routes:");
|
|
add_path = check_add_path(ndo, p, withdrawn_routes_len, 32);
|
|
while (withdrawn_routes_len != 0) {
|
|
if (add_path) {
|
|
if (withdrawn_routes_len < 4) {
|
|
p += withdrawn_routes_len;
|
|
length -= withdrawn_routes_len;
|
|
break;
|
|
}
|
|
path_id = GET_BE_U_4(p);
|
|
p += 4;
|
|
length -= 4;
|
|
withdrawn_routes_len -= 4;
|
|
}
|
|
wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf));
|
|
if (wpfx == -1) {
|
|
ND_PRINT("\n\t (illegal prefix length)");
|
|
break;
|
|
} else if (wpfx == -2)
|
|
goto trunc; /* bytes left, but not enough */
|
|
else {
|
|
ND_PRINT("\n\t %s", buf);
|
|
if (add_path) {
|
|
ND_PRINT(" Path Id: %u", path_id);
|
|
}
|
|
p += wpfx;
|
|
length -= wpfx;
|
|
withdrawn_routes_len -= wpfx;
|
|
}
|
|
}
|
|
} else {
|
|
ND_TCHECK_LEN(p, withdrawn_routes_len);
|
|
if (length < withdrawn_routes_len)
|
|
goto trunc;
|
|
p += withdrawn_routes_len;
|
|
length -= withdrawn_routes_len;
|
|
}
|
|
|
|
ND_TCHECK_2(p);
|
|
if (length < 2)
|
|
goto trunc;
|
|
len = GET_BE_U_2(p);
|
|
p += 2;
|
|
length -= 2;
|
|
|
|
if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
|
|
/* No withdrawn routes, no path attributes, no NLRI */
|
|
ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)");
|
|
return;
|
|
}
|
|
|
|
if (len) {
|
|
/* Make sure the path attributes don't go past the end of the packet */
|
|
if (length < len)
|
|
goto trunc;
|
|
/* do something more useful!*/
|
|
while (len) {
|
|
uint8_t aflags, atype, alenlen;
|
|
uint16_t alen;
|
|
|
|
ND_TCHECK_2(p);
|
|
if (length < 2)
|
|
goto trunc;
|
|
if (len < 2) {
|
|
ND_PRINT("\n\t [path attrs too short]");
|
|
p += len;
|
|
length -= len;
|
|
break;
|
|
}
|
|
aflags = GET_U_1(p);
|
|
atype = GET_U_1(p + 1);
|
|
p += 2;
|
|
len -= 2;
|
|
length -= 2;
|
|
alenlen = bgp_attr_lenlen(aflags, p);
|
|
ND_TCHECK_LEN(p, alenlen);
|
|
if (length < alenlen)
|
|
goto trunc;
|
|
if (len < alenlen) {
|
|
ND_PRINT("\n\t [path attrs too short]");
|
|
p += len;
|
|
length -= len;
|
|
break;
|
|
}
|
|
alen = bgp_attr_len(aflags, p);
|
|
p += alenlen;
|
|
len -= alenlen;
|
|
length -= alenlen;
|
|
|
|
ND_PRINT("\n\t %s (%u), length: %u",
|
|
tok2str(bgp_attr_values, "Unknown Attribute", atype),
|
|
atype,
|
|
alen);
|
|
|
|
if (aflags) {
|
|
ND_PRINT(", Flags [%s%s%s%s",
|
|
aflags & 0x80 ? "O" : "",
|
|
aflags & 0x40 ? "T" : "",
|
|
aflags & 0x20 ? "P" : "",
|
|
aflags & 0x10 ? "E" : "");
|
|
if (aflags & 0xf)
|
|
ND_PRINT("+%x", aflags & 0xf);
|
|
ND_PRINT("]: ");
|
|
}
|
|
if (len < alen) {
|
|
ND_PRINT(" [path attrs too short]");
|
|
p += len;
|
|
length -= len;
|
|
break;
|
|
}
|
|
if (length < alen)
|
|
goto trunc;
|
|
if (!bgp_attr_print(ndo, atype, p, alen, 0))
|
|
goto trunc;
|
|
p += alen;
|
|
len -= alen;
|
|
length -= alen;
|
|
}
|
|
}
|
|
|
|
if (length) {
|
|
add_path = check_add_path(ndo, p, length, 32);
|
|
ND_PRINT("\n\t Updated routes:");
|
|
while (length != 0) {
|
|
if (add_path) {
|
|
ND_TCHECK_4(p);
|
|
if (length < 4)
|
|
goto trunc;
|
|
path_id = GET_BE_U_4(p);
|
|
p += 4;
|
|
length -= 4;
|
|
}
|
|
i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
|
|
if (i == -1) {
|
|
ND_PRINT("\n\t (illegal prefix length)");
|
|
break;
|
|
} else if (i == -2)
|
|
goto trunc; /* bytes left, but not enough */
|
|
else {
|
|
ND_PRINT("\n\t %s", buf);
|
|
if (add_path) {
|
|
ND_PRINT(" Path Id: %u", path_id);
|
|
}
|
|
p += i;
|
|
length -= i;
|
|
}
|
|
}
|
|
}
|
|
return;
|
|
trunc:
|
|
nd_print_trunc(ndo);
|
|
}
|
|
|
|
static void
|
|
bgp_notification_print(netdissect_options *ndo,
|
|
const u_char *dat, u_int length)
|
|
{
|
|
const struct bgp_notification *bgp_notification_header;
|
|
const u_char *tptr;
|
|
uint8_t bgpn_major, bgpn_minor;
|
|
|
|
ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE);
|
|
if (length<BGP_NOTIFICATION_SIZE)
|
|
return;
|
|
|
|
bgp_notification_header = (const struct bgp_notification *)dat;
|
|
bgpn_major = GET_U_1(bgp_notification_header->bgpn_major);
|
|
bgpn_minor = GET_U_1(bgp_notification_header->bgpn_minor);
|
|
|
|
ND_PRINT(", %s (%u)",
|
|
tok2str(bgp_notify_major_values, "Unknown Error",
|
|
bgpn_major),
|
|
bgpn_major);
|
|
|
|
switch (bgpn_major) {
|
|
|
|
case BGP_NOTIFY_MAJOR_MSG:
|
|
ND_PRINT(", subcode %s (%u)",
|
|
tok2str(bgp_notify_minor_msg_values, "Unknown",
|
|
bgpn_minor),
|
|
bgpn_minor);
|
|
break;
|
|
case BGP_NOTIFY_MAJOR_OPEN:
|
|
ND_PRINT(", subcode %s (%u)",
|
|
tok2str(bgp_notify_minor_open_values, "Unknown",
|
|
bgpn_minor),
|
|
bgpn_minor);
|
|
break;
|
|
case BGP_NOTIFY_MAJOR_UPDATE:
|
|
ND_PRINT(", subcode %s (%u)",
|
|
tok2str(bgp_notify_minor_update_values, "Unknown",
|
|
bgpn_minor),
|
|
bgpn_minor);
|
|
break;
|
|
case BGP_NOTIFY_MAJOR_FSM:
|
|
ND_PRINT(" subcode %s (%u)",
|
|
tok2str(bgp_notify_minor_fsm_values, "Unknown",
|
|
bgpn_minor),
|
|
bgpn_minor);
|
|
break;
|
|
case BGP_NOTIFY_MAJOR_CAP:
|
|
ND_PRINT(" subcode %s (%u)",
|
|
tok2str(bgp_notify_minor_cap_values, "Unknown",
|
|
bgpn_minor),
|
|
bgpn_minor);
|
|
break;
|
|
case BGP_NOTIFY_MAJOR_CEASE:
|
|
ND_PRINT(", subcode %s (%u)",
|
|
tok2str(bgp_notify_minor_cease_values, "Unknown",
|
|
bgpn_minor),
|
|
bgpn_minor);
|
|
|
|
/* RFC 4486 mentions optionally 7 bytes
|
|
* for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
|
|
*/
|
|
if(bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
|
|
tptr = dat + BGP_NOTIFICATION_SIZE;
|
|
ND_PRINT(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
|
|
tok2str(af_values, "Unknown", GET_BE_U_2(tptr)),
|
|
GET_BE_U_2(tptr),
|
|
tok2str(bgp_safi_values, "Unknown", GET_U_1((tptr + 2))),
|
|
GET_U_1((tptr + 2)),
|
|
GET_BE_U_4(tptr + 3));
|
|
}
|
|
/*
|
|
* RFC 9003 describes a method to send a communication
|
|
* intended for human consumption regarding the Administrative Shutdown
|
|
*/
|
|
if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT ||
|
|
bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) &&
|
|
length >= BGP_NOTIFICATION_SIZE + 1) {
|
|
tptr = dat + BGP_NOTIFICATION_SIZE;
|
|
uint8_t shutdown_comm_length = GET_U_1(tptr);
|
|
uint8_t remainder_offset = 0;
|
|
/* garbage, hexdump it all */
|
|
if (shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) {
|
|
ND_PRINT(", invalid Shutdown Communication length");
|
|
}
|
|
else if (shutdown_comm_length == 0) {
|
|
ND_PRINT(", empty Shutdown Communication");
|
|
remainder_offset += 1;
|
|
}
|
|
/* a proper shutdown communication */
|
|
else {
|
|
ND_PRINT(", Shutdown Communication (length: %u): \"", shutdown_comm_length);
|
|
(void)nd_printn(ndo, tptr+1, shutdown_comm_length, NULL);
|
|
ND_PRINT("\"");
|
|
remainder_offset += shutdown_comm_length + 1;
|
|
}
|
|
/* if there is trailing data, hexdump it */
|
|
if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) {
|
|
ND_PRINT(", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE));
|
|
hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE));
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return;
|
|
trunc:
|
|
nd_print_trunc(ndo);
|
|
}
|
|
|
|
static void
|
|
bgp_route_refresh_print(netdissect_options *ndo,
|
|
const u_char *pptr, u_int len)
|
|
{
|
|
const struct bgp_route_refresh *bgp_route_refresh_header;
|
|
|
|
ND_TCHECK_LEN(pptr, BGP_ROUTE_REFRESH_SIZE);
|
|
|
|
/* some little sanity checking */
|
|
if (len<BGP_ROUTE_REFRESH_SIZE)
|
|
return;
|
|
|
|
bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
|
|
|
|
ND_PRINT("\n\t AFI %s (%u), SAFI %s (%u)",
|
|
tok2str(af_values,"Unknown",
|
|
GET_BE_U_2(bgp_route_refresh_header->afi)),
|
|
GET_BE_U_2(bgp_route_refresh_header->afi),
|
|
tok2str(bgp_safi_values,"Unknown",
|
|
GET_U_1(bgp_route_refresh_header->safi)),
|
|
GET_U_1(bgp_route_refresh_header->safi));
|
|
|
|
if (ndo->ndo_vflag > 1) {
|
|
ND_TCHECK_LEN(pptr, len);
|
|
print_unknown_data(ndo, pptr, "\n\t ", len);
|
|
}
|
|
|
|
return;
|
|
trunc:
|
|
nd_print_trunc(ndo);
|
|
}
|
|
|
|
static int
|
|
bgp_pdu_print(netdissect_options *ndo,
|
|
const u_char *dat, u_int length)
|
|
{
|
|
const struct bgp *bgp_header;
|
|
uint8_t bgp_type;
|
|
|
|
ND_TCHECK_LEN(dat, BGP_SIZE);
|
|
bgp_header = (const struct bgp *)dat;
|
|
bgp_type = GET_U_1(bgp_header->bgp_type);
|
|
|
|
ND_PRINT("\n\t%s Message (%u), length: %u",
|
|
tok2str(bgp_msg_values, "Unknown", bgp_type),
|
|
bgp_type,
|
|
length);
|
|
|
|
switch (bgp_type) {
|
|
case BGP_OPEN:
|
|
bgp_open_print(ndo, dat, length);
|
|
break;
|
|
case BGP_UPDATE:
|
|
bgp_update_print(ndo, dat, length);
|
|
break;
|
|
case BGP_NOTIFICATION:
|
|
bgp_notification_print(ndo, dat, length);
|
|
break;
|
|
case BGP_KEEPALIVE:
|
|
break;
|
|
case BGP_ROUTE_REFRESH:
|
|
bgp_route_refresh_print(ndo, dat, length);
|
|
break;
|
|
default:
|
|
/* we have no decoder for the BGP message */
|
|
ND_TCHECK_LEN(dat, length);
|
|
ND_PRINT("\n\t no Message %u decoder", bgp_type);
|
|
print_unknown_data(ndo, dat, "\n\t ", length);
|
|
break;
|
|
}
|
|
return 1;
|
|
trunc:
|
|
nd_print_trunc(ndo);
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
bgp_print(netdissect_options *ndo,
|
|
const u_char *dat, u_int length _U_)
|
|
{
|
|
const u_char *p;
|
|
const u_char *ep = ndo->ndo_snapend;
|
|
const u_char *start;
|
|
const u_char marker[] = {
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
};
|
|
const struct bgp *bgp_header;
|
|
uint16_t hlen;
|
|
|
|
ndo->ndo_protocol = "bgp";
|
|
ND_PRINT(": BGP");
|
|
|
|
if (ndo->ndo_vflag < 1) /* lets be less chatty */
|
|
return;
|
|
|
|
p = dat;
|
|
start = p;
|
|
while (p < ep) {
|
|
if (!ND_TTEST_1(p))
|
|
break;
|
|
if (GET_U_1(p) != 0xff) {
|
|
p++;
|
|
continue;
|
|
}
|
|
|
|
if (!ND_TTEST_LEN(p, sizeof(marker)))
|
|
break;
|
|
if (memcmp(p, marker, sizeof(marker)) != 0) {
|
|
p++;
|
|
continue;
|
|
}
|
|
|
|
/* found BGP header */
|
|
ND_TCHECK_LEN(p, BGP_SIZE);
|
|
bgp_header = (const struct bgp *)p;
|
|
|
|
if (start != p)
|
|
nd_print_trunc(ndo);
|
|
|
|
hlen = GET_BE_U_2(bgp_header->bgp_len);
|
|
if (hlen < BGP_SIZE) {
|
|
ND_PRINT("\nmessage length %u < %u", hlen, BGP_SIZE);
|
|
nd_print_invalid(ndo);
|
|
break;
|
|
}
|
|
|
|
if (ND_TTEST_LEN(p, hlen)) {
|
|
if (!bgp_pdu_print(ndo, p, hlen))
|
|
return;
|
|
p += hlen;
|
|
start = p;
|
|
} else {
|
|
ND_PRINT("\n[|BGP %s]",
|
|
tok2str(bgp_msg_values,
|
|
"Unknown Message Type",
|
|
GET_U_1(bgp_header->bgp_type)));
|
|
break;
|
|
}
|
|
}
|
|
|
|
return;
|
|
|
|
trunc:
|
|
nd_print_trunc(ndo);
|
|
}
|