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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 */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#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;
+ /* options should follow */
+};
+#define BGP_OPEN_SIZE 29 /* unaligned */
+
+struct bgp_opt {
+ nd_uint8_t bgpopt_type;
+ nd_uint8_t bgpopt_len;
+ /* 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 {
+ 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 res;
+ nd_uint8_t safi;
+};
+#define BGP_ROUTE_REFRESH_SIZE 23
+
+#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_DPA 11 /* deprecated, draft-ietf-idr-bgp-dpa */
+#define BGPTYPE_ADVERTISERS 12 /* deprecated RFC1863 */
+#define BGPTYPE_RCID_PATH 13 /* deprecated RFC1863 */
+#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_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_DPA, "DPA"},
+ { BGPTYPE_ADVERTISERS, "Advertisers"},
+ { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"},
+ { 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_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_ML 8 /* RFC8277 */
+#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 /* draft-keyur-bgp-enhanced-route-refresh */
+#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_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)"},
+ { 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_CAP 7
+
+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_CAP, "Capability Message Error"},
+ { 0, NULL}
+};
+
+/* RFC 4486 */
+#define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
+#define BGP_NOTIFY_MINOR_CEASE_SHUT 2
+#define BGP_NOTIFY_MINOR_CEASE_RESET 4
+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"},
+ { 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_cap_values[] = {
+ { 1, "Invalid Action Value" },
+ { 2, "Invalid Capability Length" },
+ { 3, "Malformed Capability Value" },
+ { 4, "Unsupported Capability Code" },
+ { 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}
+};
+
+/* 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 }
+};
+
+/* 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) */
+ /* 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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 09:47:47 +0000