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print-bgp.c
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print-bgp.c
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/*
* Copyright (C) 1999 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Extensively modified by Hannes Gredler (hannes@gredler.at) for more
* complete BGP support.
*/
/* \summary: Border Gateway Protocol (BGP) printer */
/* specification: RFC 4271 */
#include <config.h>
#include "netdissect-stdinc.h"
#include <stdio.h>
#include <string.h>
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#include "af.h"
#include "l2vpn.h"
struct bgp {
nd_byte bgp_marker[16];
nd_uint16_t bgp_len;
nd_uint8_t bgp_type;
};
#define BGP_SIZE 19 /* unaligned */
#define BGP_OPEN 1
#define BGP_UPDATE 2
#define BGP_NOTIFICATION 3
#define BGP_KEEPALIVE 4
#define BGP_ROUTE_REFRESH 5
static const struct tok bgp_msg_values[] = {
{ BGP_OPEN, "Open"},
{ BGP_UPDATE, "Update"},
{ BGP_NOTIFICATION, "Notification"},
{ BGP_KEEPALIVE, "Keepalive"},
{ BGP_ROUTE_REFRESH, "Route Refresh"},
{ 0, NULL}
};
struct bgp_open {
nd_byte bgpo_marker[16];
nd_uint16_t bgpo_len;
nd_uint8_t bgpo_type;
nd_uint8_t bgpo_version;
nd_uint16_t bgpo_myas;
nd_uint16_t bgpo_holdtime;
nd_uint32_t bgpo_id;
nd_uint8_t bgpo_optlen;
nd_uint8_t bgpo_opttype; /* RFC9072 */
nd_uint16_t bgpo_optlen_extended; /* RFC9072 */
/* options should follow */
};
#define BGP_OPEN_SIZE 29 /* unaligned */
struct bgp_opt {
nd_uint8_t bgpopt_type;
nd_uint16_t bgpopt_len; /* Can be one or two bytes, depending on RFC9072 */
/* variable length */
};
#define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
#define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
struct bgp_notification {
nd_byte bgpn_marker[16];
nd_uint16_t bgpn_len;
nd_uint8_t bgpn_type;
nd_uint8_t bgpn_major;
nd_uint8_t bgpn_minor;
};
#define BGP_NOTIFICATION_SIZE 21 /* unaligned */
struct bgp_route_refresh_orf {
nd_uint8_t refresh;
nd_uint8_t type;
nd_uint16_t len;
};
struct bgp_route_refresh {
nd_byte bgp_marker[16];
nd_uint16_t len;
nd_uint8_t type; /* No padding after this; afi is, in fact, not aligned */
nd_uint16_t afi;
nd_uint8_t subtype;
nd_uint8_t safi;
};
static const struct tok bgp_orf_refresh_type[] = {
{ 1, "Immediate"},
{ 2, "Defer"},
{ 0, NULL }
};
static const struct tok bgp_orf_type[] = {
{ 64, "Address Prefix ORF"},
{ 65, "CP-ORF"},
{ 0, NULL }
};
#define BGP_ROUTE_REFRESH_SIZE 23
#define BGP_ROUTE_REFRESH_SIZE_ORF BGP_ROUTE_REFRESH_SIZE + 5
#define BGP_ROUTE_REFRESH_SUBTYPE_NORMAL 0
#define BGP_ROUTE_REFRESH_SUBTYPE_BORR 1
#define BGP_ROUTE_REFRESH_SUBTYPE_EORR 2
#define BGP_ROUTE_REFRESH_SUBTYPE_RESERVED 255
static const struct tok bgp_route_refresh_subtype_values[] = {
{BGP_ROUTE_REFRESH_SUBTYPE_NORMAL, "Normal route refresh request"},
{BGP_ROUTE_REFRESH_SUBTYPE_BORR,
"Demarcation of the beginning of a route refresh"},
{BGP_ROUTE_REFRESH_SUBTYPE_EORR,
"Demarcation of the ending of a route refresh"},
{0, NULL}};
#define bgp_attr_lenlen(flags, p) \
(((flags) & 0x10) ? 2U : 1U)
#define bgp_attr_len(flags, p) \
(((flags) & 0x10) ? GET_BE_U_2(p) : GET_U_1(p))
#define BGPTYPE_ORIGIN 1
#define BGPTYPE_AS_PATH 2
#define BGPTYPE_NEXT_HOP 3
#define BGPTYPE_MULTI_EXIT_DISC 4
#define BGPTYPE_LOCAL_PREF 5
#define BGPTYPE_ATOMIC_AGGREGATE 6
#define BGPTYPE_AGGREGATOR 7
#define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
#define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */
#define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */
#define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */
#define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */
#define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */
#define BGPTYPE_AS4_PATH 17 /* RFC6793 */
#define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */
#define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */
#define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */
#define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */
#define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */
#define BGPTYPE_AIGP 26 /* RFC7311 */
#define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */
#define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */
#define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */
#define BGPTYPE_BGPSEC_PATH 33 /* RFC8205 */
#define BGPTYPE_OTC 35 /* RFC9234 */
#define BGPTYPE_ATTR_SET 128 /* RFC6368 */
#define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */
static const struct tok bgp_attr_values[] = {
{ BGPTYPE_ORIGIN, "Origin"},
{ BGPTYPE_AS_PATH, "AS Path"},
{ BGPTYPE_AS4_PATH, "AS4 Path"},
{ BGPTYPE_NEXT_HOP, "Next Hop"},
{ BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"},
{ BGPTYPE_LOCAL_PREF, "Local Preference"},
{ BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
{ BGPTYPE_AGGREGATOR, "Aggregator"},
{ BGPTYPE_AGGREGATOR4, "Aggregator4"},
{ BGPTYPE_COMMUNITIES, "Community"},
{ BGPTYPE_ORIGINATOR_ID, "Originator ID"},
{ BGPTYPE_CLUSTER_LIST, "Cluster List"},
{ BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"},
{ BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"},
{ BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
{ BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"},
{ BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"},
{ BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"},
{ BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
{ BGPTYPE_AIGP, "Accumulated IGP Metric"},
{ BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
{ BGPTYPE_ENTROPY_LABEL, "Entropy Label"},
{ BGPTYPE_LARGE_COMMUNITY, "Large Community"},
{ BGPTYPE_BGPSEC_PATH, "BGPsec Path"},
{ BGPTYPE_OTC, "Only to Customer (OTC)"},
{ BGPTYPE_ATTR_SET, "Attribute Set"},
{ 255, "Reserved for development"},
{ 0, NULL}
};
#define BGP_AS_SET 1
#define BGP_AS_SEQUENCE 2
#define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
#define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */
#define BGP_AS_SEG_TYPE_MIN BGP_AS_SET
#define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET
static const struct tok bgp_as_path_segment_open_values[] = {
{ BGP_AS_SEQUENCE, ""},
{ BGP_AS_SET, "{ "},
{ BGP_CONFED_AS_SEQUENCE, "( "},
{ BGP_CONFED_AS_SET, "({ "},
{ 0, NULL}
};
static const struct tok bgp_as_path_segment_close_values[] = {
{ BGP_AS_SEQUENCE, ""},
{ BGP_AS_SET, "}"},
{ BGP_CONFED_AS_SEQUENCE, ")"},
{ BGP_CONFED_AS_SET, "})"},
{ 0, NULL}
};
#define BGP_OPT_AUTH 1
#define BGP_OPT_CAP 2
static const struct tok bgp_opt_values[] = {
{ BGP_OPT_AUTH, "Authentication Information"},
{ BGP_OPT_CAP, "Capabilities Advertisement"},
{ 0, NULL}
};
#define BGP_CAPCODE_MP 1 /* RFC2858 */
#define BGP_CAPCODE_RR 2 /* RFC2918 */
#define BGP_CAPCODE_ORF 3 /* RFC5291 */
#define BGP_CAPCODE_MR 4 /* RFC3107 */
#define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */
#define BGP_CAPCODE_EXT_MSG 6 /* RFC8654 */
#define BGP_CAPCODE_BGPSEC 7 /* RFC8205 */
#define BGP_CAPCODE_ML 8 /* RFC8277 */
#define BGP_CAPCODE_ROLE 9 /* RFC9234 */
#define BGP_CAPCODE_RESTART 64 /* RFC4724 */
#define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */
#define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */
#define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */
#define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */
#define BGP_CAPCODE_ENH_RR 70 /* RFC7313 */
#define BGP_CAPCODE_LLGR 71 /* draft-uttaro-idr-bgp-persistence-05 */
#define BGP_CAPCODE_RR_CISCO 128
static const struct tok bgp_capcode_values[] = {
{ BGP_CAPCODE_MP, "Multiprotocol Extensions"},
{ BGP_CAPCODE_RR, "Route Refresh"},
{ BGP_CAPCODE_ORF, "Cooperative Route Filtering"},
{ BGP_CAPCODE_MR, "Multiple Routes to a Destination"},
{ BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"},
{ BGP_CAPCODE_EXT_MSG, "BGP Extended Message"},
{ BGP_CAPCODE_BGPSEC, "BGPsec"},
{ BGP_CAPCODE_ML, "Multiple Labels"},
{ BGP_CAPCODE_RESTART, "Graceful Restart"},
{ BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
{ BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
{ BGP_CAPCODE_MULTISESS, "Multisession BGP"},
{ BGP_CAPCODE_ADD_PATH, "Multiple Paths"},
{ BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"},
{ BGP_CAPCODE_LLGR, "Long-lived Graceful Restart"},
{ BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"},
{ BGP_CAPCODE_ROLE, "Role Capability"},
{ 0, NULL}
};
#define BGP_NOTIFY_MAJOR_MSG 1
#define BGP_NOTIFY_MAJOR_OPEN 2
#define BGP_NOTIFY_MAJOR_UPDATE 3
#define BGP_NOTIFY_MAJOR_HOLDTIME 4
#define BGP_NOTIFY_MAJOR_FSM 5
#define BGP_NOTIFY_MAJOR_CEASE 6
#define BGP_NOTIFY_MAJOR_ROUTEREFRESH 7
#define BGP_NOTIFY_MAJOR_SENDHOLDTIME 8
static const struct tok bgp_notify_major_values[] = {
{ BGP_NOTIFY_MAJOR_MSG, "Message Header Error"},
{ BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"},
{ BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"},
{ BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
{ BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"},
{ BGP_NOTIFY_MAJOR_CEASE, "Cease"},
{ BGP_NOTIFY_MAJOR_ROUTEREFRESH, "ROUTE-REFRESH Message Error"},
{ BGP_NOTIFY_MAJOR_SENDHOLDTIME, "Send Hold Timer Expired"},
{ 0, NULL}
};
/* RFC 4486 */
#define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
/* RFC 9003 */
#define BGP_NOTIFY_MINOR_CEASE_SHUT 2
#define BGP_NOTIFY_MINOR_CEASE_RESET 4
/* RFC 8538 */
#define BGP_NOTIFY_MINOR_CEASE_HARDRESET 9
static const struct tok bgp_notify_minor_cease_values[] = {
{ BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
{ BGP_NOTIFY_MINOR_CEASE_SHUT, "Administrative Shutdown"},
{ 3, "Peer Unconfigured"},
{ BGP_NOTIFY_MINOR_CEASE_RESET, "Administrative Reset"},
{ 5, "Connection Rejected"},
{ 6, "Other Configuration Change"},
{ 7, "Connection Collision Resolution"},
{ 8, "Out of Resources"},
{ BGP_NOTIFY_MINOR_CEASE_HARDRESET, "Hard Reset"},
{ 10, "BFD Down"},
{ 0, NULL}
};
static const struct tok bgp_notify_minor_msg_values[] = {
{ 1, "Connection Not Synchronized"},
{ 2, "Bad Message Length"},
{ 3, "Bad Message Type"},
{ 0, NULL}
};
static const struct tok bgp_notify_minor_open_values[] = {
{ 1, "Unsupported Version Number"},
{ 2, "Bad Peer AS"},
{ 3, "Bad BGP Identifier"},
{ 4, "Unsupported Optional Parameter"},
{ 5, "Authentication Failure"},
{ 6, "Unacceptable Hold Time"},
{ 7, "Capability Message Error"},
{ 0, NULL}
};
static const struct tok bgp_notify_minor_update_values[] = {
{ 1, "Malformed Attribute List"},
{ 2, "Unrecognized Well-known Attribute"},
{ 3, "Missing Well-known Attribute"},
{ 4, "Attribute Flags Error"},
{ 5, "Attribute Length Error"},
{ 6, "Invalid ORIGIN Attribute"},
{ 7, "AS Routing Loop"},
{ 8, "Invalid NEXT_HOP Attribute"},
{ 9, "Optional Attribute Error"},
{ 10, "Invalid Network Field"},
{ 11, "Malformed AS_PATH"},
{ 0, NULL}
};
static const struct tok bgp_notify_minor_fsm_values[] = {
{ 0, "Unspecified Error"},
{ 1, "In OpenSent State"},
{ 2, "In OpenConfirm State"},
{ 3, "In Established State"},
{ 0, NULL }
};
static const struct tok bgp_notify_minor_routerefresh_values[] = {
{ 1, "Invalid Message Length" },
{ 0, NULL }
};
static const struct tok bgp_origin_values[] = {
{ 0, "IGP"},
{ 1, "EGP"},
{ 2, "Incomplete"},
{ 0, NULL}
};
#define BGP_PMSI_TUNNEL_RSVP_P2MP 1
#define BGP_PMSI_TUNNEL_LDP_P2MP 2
#define BGP_PMSI_TUNNEL_PIM_SSM 3
#define BGP_PMSI_TUNNEL_PIM_SM 4
#define BGP_PMSI_TUNNEL_PIM_BIDIR 5
#define BGP_PMSI_TUNNEL_INGRESS 6
#define BGP_PMSI_TUNNEL_LDP_MP2MP 7
static const struct tok bgp_pmsi_tunnel_values[] = {
{ BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
{ BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
{ BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
{ BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
{ BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
{ BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
{ BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
{ 0, NULL}
};
static const struct tok bgp_pmsi_flag_values[] = {
{ 0x01, "Leaf Information required"},
{ 0, NULL}
};
#define BGP_AIGP_TLV 1
static const struct tok bgp_aigp_values[] = {
{ BGP_AIGP_TLV, "AIGP"},
{ 0, NULL}
};
#define BGP_ROLE_PROVIDER 0
#define BGP_ROLE_RS 1
#define BGP_ROLE_RS_CLIENT 2
#define BGP_ROLE_CUSTOMER 3
#define BGP_ROLE_PEER 4
static const struct tok bgp_role_values[] = {
{ BGP_ROLE_PROVIDER, "Provider"},
{ BGP_ROLE_RS, "RS"},
{ BGP_ROLE_RS_CLIENT, "RS-Client"},
{ BGP_ROLE_CUSTOMER, "Customer"},
{ BGP_ROLE_PEER, "Peer"},
{ 0, NULL}
};
/* Subsequent address family identifier, RFC2283 section 7 */
#define SAFNUM_RES 0
#define SAFNUM_UNICAST 1
#define SAFNUM_MULTICAST 2
#define SAFNUM_UNIMULTICAST 3 /* deprecated now */
/* labeled BGP RFC3107 */
#define SAFNUM_LABUNICAST 4
/* RFC6514 */
#define SAFNUM_MULTICAST_VPN 5
/* draft-nalawade-kapoor-tunnel-safi */
#define SAFNUM_TUNNEL 64
/* RFC4761 */
#define SAFNUM_VPLS 65
/* RFC6037 */
#define SAFNUM_MDT 66
/* RFC7432 */
#define SAFNUM_EVPN 70
/* RFC4364 */
#define SAFNUM_VPNUNICAST 128
/* RFC6513 */
#define SAFNUM_VPNMULTICAST 129
#define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */
/* RFC4684 */
#define SAFNUM_RT_ROUTING_INFO 132
#define BGP_VPN_RD_LEN 8
static const struct tok bgp_safi_values[] = {
{ SAFNUM_RES, "Reserved"},
{ SAFNUM_UNICAST, "Unicast"},
{ SAFNUM_MULTICAST, "Multicast"},
{ SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
{ SAFNUM_LABUNICAST, "labeled Unicast"},
{ SAFNUM_TUNNEL, "Tunnel"},
{ SAFNUM_VPLS, "VPLS"},
{ SAFNUM_MDT, "MDT"},
{ SAFNUM_EVPN, "EVPN"},
{ SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
{ SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
{ SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
{ SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"},
{ SAFNUM_MULTICAST_VPN, "Multicast VPN"},
{ 0, NULL }
};
static const struct tok bgp_graceful_restart_comm_flag_values[] = {
{ 0x8, "R" },
{ 0x4, "N" },
{ 0, NULL }
};
/* well-known community */
#define BGP_COMMUNITY_NO_EXPORT 0xffffff01
#define BGP_COMMUNITY_NO_ADVERT 0xffffff02
#define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
/* Extended community type - RFC 4360 */
#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) */
#define BGP_EXT_COM_OVS 0x4300 /* BGP Prefix Origin Validation State Extended Community */
/* 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
/* Optional Parameters */
#define BGP_OPEN_NON_EXT_OPT_TYPE_EXTENDED_LENGTH 255 /* Non-Ext OP Type */
static const struct tok bgp_extd_comm_flag_values[] = {
{ 0x8000, "vendor-specific"},
{ 0x4000, "non-transitive"},
{ 0, NULL},
};
/* rfc8097 */
static const struct tok bgp_prefix_origin_validation_state[] = {
{ 0, "valid" },
{ 1, "not found" },
{ 2, "invalid" },
{ 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_OVS, "origin-validation-state"},
{ 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 },
};
static const struct tok bgp_bgpsec_bitmap_str[] = {
{ 1U << 0, "MBZ-0" },
{ 1U << 1, "MBZ-1" },
{ 1U << 2, "MBZ-2" },
{ 1U << 3, "MBZ-3" },
{ 1U << 4, "MBZ-4" },
{ 1U << 5, "MBZ-5" },
{ 1U << 6, "MBZ-6" },
{ 1U << 7, "C" },
{ 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
print_labeled_prefix4(netdissect_options *ndo,
const u_char *pptr, u_int itemlen)
{
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)
goto badplen;
plen-=24; /* adjust prefixlen - labellength */
if (32 < plen)
goto badplen;
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 */
ND_PRINT("\n\t %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;
badplen:
ND_PRINT("\n\t (illegal prefix length)");
return -1;
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)
{
uint8_t addr_length;
u_int total_length;
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;
if (addr_length) {
ND_PRINT(", 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;
if (addr_length) {
ND_PRINT(", 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)
{
/* 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:
ND_PRINT("bandwidth: %.3f Mbps",
GET_BE_F_4(pptr + 4)*8/1000000);
break;
case BGP_EXT_COM_OVS:
/* The Reserved field MUST be set to 0 and ignored upon the
* receipt of this community.
*/
{
uint64_t reserved = GET_BE_U_5(pptr + 2);
if (reserved)
ND_PRINT("[the reserved field 0x%" PRIx64 " MUST be 0] ",
reserved);
ND_PRINT("ovs: %s",
tok2str(bgp_prefix_origin_validation_state,
"unknown origin validation state",
GET_U_1(pptr + 7)));
}
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]