/*
* 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@juniper.net) for more
* complete BGP support.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-bgp.c,v 1.118 2007-12-07 15:54:52 hannes Exp $";
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "decode_prefix.h"
#include "addrtoname.h"
#include "extract.h"
#include "bgp.h"
#include "af.h"
#include "l2vpn.h"
struct bgp {
u_int8_t bgp_marker[16];
u_int16_t bgp_len;
u_int8_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 {
u_int8_t bgpo_marker[16];
u_int16_t bgpo_len;
u_int8_t bgpo_type;
u_int8_t bgpo_version;
u_int16_t bgpo_myas;
u_int16_t bgpo_holdtime;
u_int32_t bgpo_id;
u_int8_t bgpo_optlen;
/* options should follow */
};
#define BGP_OPEN_SIZE 29 /* unaligned */
struct bgp_opt {
u_int8_t bgpopt_type;
u_int8_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 {
u_int8_t bgpn_marker[16];
u_int16_t bgpn_len;
u_int8_t bgpn_type;
u_int8_t bgpn_major;
u_int8_t bgpn_minor;
};
#define BGP_NOTIFICATION_SIZE 21 /* unaligned */
struct bgp_route_refresh {
u_int8_t bgp_marker[16];
u_int16_t len;
u_int8_t type;
u_int8_t afi[2]; /* the compiler messes this structure up */
u_int8_t res; /* when doing misaligned sequences of int8 and int16 */
u_int8_t safi; /* afi should be int16 - so we have to access it using */
}; /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh) */
#define BGP_ROUTE_REFRESH_SIZE 23
#define bgp_attr_lenlen(flags, p) \
(((flags) & 0x10) ? 2 : 1)
#define bgp_attr_len(flags, p) \
(((flags) & 0x10) ? EXTRACT_16BITS(p) : *(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 /* RFC1998 */
#define BGPTYPE_CLUSTER_LIST 10 /* RFC1998 */
#define BGPTYPE_DPA 11 /* draft-ietf-idr-bgp-dpa */
#define BGPTYPE_ADVERTISERS 12 /* RFC1863 */
#define BGPTYPE_RCID_PATH 13 /* RFC1863 */
#define BGPTYPE_MP_REACH_NLRI 14 /* RFC2283 */
#define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC2283 */
#define BGPTYPE_EXTD_COMMUNITIES 16 /* draft-ietf-idr-bgp-ext-communities */
#define BGPTYPE_AS4_PATH 17 /* RFC4893 */
#define BGPTYPE_AGGREGATOR4 18 /* RFC4893 */
#define BGPTYPE_PMSI_TUNNEL 22 /* draft-ietf-l3vpn-2547bis-mcast-bgp-02.txt */
#define BGPTYPE_ATTR_SET 128 /* draft-marques-ppvpn-ibgp */
#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_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
#define BGP_CAPCODE_RR 2
#define BGP_CAPCODE_ORF 3 /* XXX */
#define BGP_CAPCODE_RESTART 64 /* draft-ietf-idr-restart-05 */
#define BGP_CAPCODE_AS_NEW 65 /* XXX */
#define BGP_CAPCODE_DYN_CAP 67 /* XXX */
#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_RESTART, "Graceful Restart"},
{ BGP_CAPCODE_AS_NEW, "32-Bit AS Number"},
{ BGP_CAPCODE_DYN_CAP, "Dynamic Capability"},
{ 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}
};
/* draft-ietf-idr-cease-subcode-02 */
#define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1
static const struct tok bgp_notify_minor_cease_values[] = {
{ BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
{ 2, "Administratively Shutdown"},
{ 3, "Peer Unconfigured"},
{ 4, "Administratively 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_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}
};
/* Subsequent address family identifier, RFC2283 section 7 */
#define SAFNUM_RES 0
#define SAFNUM_UNICAST 1
#define SAFNUM_MULTICAST 2
#define SAFNUM_UNIMULTICAST 3
/* labeled BGP RFC3107 */
#define SAFNUM_LABUNICAST 4
/* draft-ietf-l3vpn-2547bis-mcast-bgp-02.txt */
#define SAFNUM_MULTICAST_VPN 5
#define SAFNUM_TUNNEL 64 /* XXX */
#define SAFNUM_VPLS 65 /* XXX */
/* draft-nalawade-idr-mdt-safi-03 */
#define SAFNUM_MDT 66
/* Section 4.3.4 of draft-rosen-rfc2547bis-03.txt */
#define SAFNUM_VPNUNICAST 128
#define SAFNUM_VPNMULTICAST 129
#define SAFNUM_VPNUNIMULTICAST 130
/* draft-marques-ppvpn-rt-constrain-01.txt */
#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_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 - draft-ietf-idr-bgp-ext-communities-05 */
#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 compatability */
#define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatability */
#define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatability */
#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 compatability */
#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 compatability */
#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) */
/* http://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_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},
};
/* 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 },
};
#define TOKBUFSIZE 128
static char astostr[20];
/*
* as_printf
*
* Convert an AS number into a string and return string pointer.
*
* Bepending on bflag is set or not, AS number is converted into ASDOT notation
* or plain number notation.
*
*/
static char *
as_printf (char *str, int size, u_int asnum)
{
if (!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(const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
{
struct in_addr addr;
u_int plen, plenbytes;
TCHECK(pptr[0]);
ITEMCHECK(1);
plen = pptr[0];
if (32 < plen)
return -1;
itemlen -= 1;
memset(&addr, 0, sizeof(addr));
plenbytes = (plen + 7) / 8;
TCHECK2(pptr[1], plenbytes);
ITEMCHECK(plenbytes);
memcpy(&addr, &pptr[1], plenbytes);
if (plen % 8) {
((u_char *)&addr)[plenbytes - 1] &=
((0xff00 >> (plen % 8)) & 0xff);
}
snprintf(buf, buflen, "%s/%d", getname((u_char *)&addr), plen);
return 1 + plenbytes;
trunc:
return -2;
badtlv:
return -3;
}
static int
decode_labeled_prefix4(const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
{
struct in_addr addr;
u_int plen, plenbytes;
/* prefix length and label = 4 bytes */
TCHECK2(pptr[0], 4);
ITEMCHECK(4);
plen = pptr[0]; /* 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 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;
TCHECK2(pptr[4], plenbytes);
ITEMCHECK(plenbytes);
memcpy(&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/%d, label:%u %s",
getname((u_char *)&addr),
plen,
EXTRACT_24BITS(pptr+1)>>4,
((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 dependend on address length.
*/
static char *
bgp_vpn_ip_print (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(struct in_addr) << 3): /* 32 */
TCHECK2(pptr[0], sizeof(struct in_addr));
snprintf(pos, sizeof(addr), "%s", ipaddr_string(pptr));
break;
#ifdef INET6
case (sizeof(struct in6_addr) << 3): /* 128 */
TCHECK2(pptr[0], sizeof(struct in6_addr));
snprintf(pos, sizeof(addr), "%s", ip6addr_string(pptr));
break;
#endif
default:
snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
break;
}
pos += strlen(pos);
trunc:
*(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 int
bgp_vpn_sg_print (const u_char *pptr, char *buf, u_int buflen) {
u_int8_t addr_length;
u_int total_length, offset;
total_length = 0;
/* Source address length, encoded in bits */
TCHECK2(pptr[0], 1);
addr_length = *pptr++;
/* Source address */
TCHECK2(pptr[0], (addr_length >> 3));
total_length += (addr_length >> 3) + 1;
offset = strlen(buf);
if (addr_length) {
snprintf(buf + offset, buflen - offset, ", Source %s",
bgp_vpn_ip_print(pptr, addr_length));
pptr += (addr_length >> 3);
}
/* Group address length, encoded in bits */
TCHECK2(pptr[0], 1);
addr_length = *pptr++;
/* Group address */
TCHECK2(pptr[0], (addr_length >> 3));
total_length += (addr_length >> 3) + 1;
offset = strlen(buf);
if (addr_length) {
snprintf(buf + offset, buflen - offset, ", Group %s",
bgp_vpn_ip_print(pptr, addr_length));
pptr += (addr_length >> 3);
}
trunc:
return (total_length);
}
/* RDs and RTs share the same semantics
* we use bgp_vpn_rd_print for
* printing route targets inside a NLRI */
char *
bgp_vpn_rd_print (const u_char *pptr) {
/* allocate space for the largest possible string */
static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
char *pos = rd;
/* ok lets load the RD format */
switch (EXTRACT_16BITS(pptr)) {
/* 2-byte-AS:number fmt*/
case 0:
snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
EXTRACT_16BITS(pptr+2),
EXTRACT_32BITS(pptr+4),
*(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7));
break;
/* IP-address:AS fmt*/
case 1:
snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
*(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6));
break;
/* 4-byte-AS:number fmt*/
case 2:
snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
as_printf(astostr, sizeof(astostr), EXTRACT_32BITS(pptr+2)),
EXTRACT_16BITS(pptr+6), *(pptr+2), *(pptr+3), *(pptr+4),
*(pptr+5), EXTRACT_16BITS(pptr+6));
break;
default:
snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
break;
}
pos += strlen(pos);
*(pos) = '\0';
return (rd);
}
static int
decode_rt_routing_info(const u_char *pptr, char *buf, u_int buflen)
{
u_int8_t route_target[8];
u_int plen;
TCHECK(pptr[0]);
plen = pptr[0]; /* get prefix length */
if (0 == plen)
return 1; /* default route target */
if (32 > plen)
return -1;
plen-=32; /* adjust prefix length */
if (64 < plen)
return -1;
memset(&route_target, 0, sizeof(route_target));
TCHECK2(pptr[1], (plen + 7) / 8);
memcpy(&route_target, &pptr[1], (plen + 7) / 8);
if (plen % 8) {
((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
((0xff00 >> (plen % 8)) & 0xff);
}
snprintf(buf, buflen, "origin AS: %s, route target %s",
as_printf(astostr, sizeof(astostr), EXTRACT_32BITS(pptr+1)),
bgp_vpn_rd_print((u_char *)&route_target));
return 5 + (plen + 7) / 8;
trunc:
return -2;
}
static int
decode_labeled_vpn_prefix4(const u_char *pptr, char *buf, u_int buflen)
{
struct in_addr addr;
u_int plen;
TCHECK(pptr[0]);
plen = pptr[0]; /* 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));
TCHECK2(pptr[12], (plen + 7) / 8);
memcpy(&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/%d, label:%u %s",
bgp_vpn_rd_print(pptr+4),
getname((u_char *)&addr),
plen,
EXTRACT_24BITS(pptr+1)>>4,
((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
return 12 + (plen + 7) / 8;
trunc:
return -2;
}
/*
* +-------------------------------+
* | |
* | RD:IPv4-address (12 octets) |
* | |
* +-------------------------------+
* | MDT Group-address (4 octets) |
* +-------------------------------+
*/
#define MDT_VPN_NLRI_LEN 16
static int
decode_mdt_vpn_nlri(const u_char *pptr, char *buf, u_int buflen)
{
const u_char *rd;
const u_char *vpn_ip;
TCHECK(pptr[0]);
/* if the NLRI is not predefined length, quit.*/
if (*pptr != MDT_VPN_NLRI_LEN * NBBY)
return -1;
pptr++;
/* RD */
TCHECK2(pptr[0], 8);
rd = pptr;
pptr+=8;
/* IPv4 address */
TCHECK2(pptr[0], sizeof(struct in_addr));
vpn_ip = pptr;
pptr+=sizeof(struct in_addr);
/* MDT Group Address */
TCHECK2(pptr[0], sizeof(struct in_addr));
snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
bgp_vpn_rd_print(rd), ipaddr_string(vpn_ip), 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"},
};
static int
decode_multicast_vpn(const u_char *pptr, char *buf, u_int buflen)
{
u_int8_t route_type, route_length, addr_length, sg_length;
u_int offset;
TCHECK2(pptr[0], 2);
route_type = *pptr++;
route_length = *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:
TCHECK2(pptr[0], BGP_VPN_RD_LEN);
offset = strlen(buf);
snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
bgp_vpn_rd_print(pptr),
bgp_vpn_ip_print(pptr + BGP_VPN_RD_LEN,
(route_length - BGP_VPN_RD_LEN) << 3));
break;
case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4);
offset = strlen(buf);
snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
bgp_vpn_rd_print(pptr),
as_printf(astostr, sizeof(astostr),
EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
break;
case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
TCHECK2(pptr[0], BGP_VPN_RD_LEN);
offset = strlen(buf);
snprintf(buf + offset, buflen - offset, ", RD: %s",
bgp_vpn_rd_print(pptr));
pptr += BGP_VPN_RD_LEN;
sg_length = bgp_vpn_sg_print(pptr, buf, buflen);
addr_length = route_length - sg_length;
TCHECK2(pptr[0], addr_length);
offset = strlen(buf);
snprintf(buf + offset, buflen - offset, ", Originator %s",
bgp_vpn_ip_print(pptr, addr_length << 3));
break;
case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
TCHECK2(pptr[0], BGP_VPN_RD_LEN);
offset = strlen(buf);
snprintf(buf + offset, buflen - offset, ", RD: %s",
bgp_vpn_rd_print(pptr));
pptr += BGP_VPN_RD_LEN;
bgp_vpn_sg_print(pptr, buf, buflen);
break;
case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
TCHECK2(pptr[0], BGP_VPN_RD_LEN);
offset = strlen(buf);
snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
bgp_vpn_rd_print(pptr),
as_printf(astostr, sizeof(astostr),
EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
pptr += BGP_VPN_RD_LEN;
bgp_vpn_sg_print(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, strlen) \
if (strlen<0) \
buflen=0; \
else if ((u_int)strlen>buflen) \
buflen=0; \
else { \
buflen-=strlen; \
buf+=strlen; \
}
static int
decode_labeled_vpn_l2(const u_char *pptr, char *buf, u_int buflen)
{
int plen,tlen,strlen,tlv_type,tlv_len,ttlv_len;
TCHECK2(pptr[0], 2);
plen=EXTRACT_16BITS(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 */
TCHECK2(pptr[0],12);
buf[0]='\0';
strlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s",
bgp_vpn_rd_print(pptr),
/* need something like getname() here */
getname(pptr+8)
);
UPDATE_BUF_BUFLEN(buf, buflen, strlen);
pptr+=12;
tlen-=12;
return plen;
} else if (plen>17) {
/* assume old format */
/* RD, ID, LBLKOFF, LBLBASE */
TCHECK2(pptr[0],15);
buf[0]='\0';
strlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
bgp_vpn_rd_print(pptr),
EXTRACT_16BITS(pptr+8),
EXTRACT_16BITS(pptr+10),
EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
UPDATE_BUF_BUFLEN(buf, buflen, strlen);
pptr+=15;
tlen-=15;
/* ok now the variable part - lets read out TLVs*/
while (tlen>0) {
if (tlen < 3)
return -1;
TCHECK2(pptr[0], 3);
tlv_type=*pptr++;
tlv_len=EXTRACT_16BITS(pptr);
ttlv_len=tlv_len;
pptr+=2;
switch(tlv_type) {
case 1:
if (buflen!=0) {
strlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
tlv_type,
tlv_len);
UPDATE_BUF_BUFLEN(buf, buflen, strlen);
}
ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
while (ttlv_len>0) {
TCHECK(pptr[0]);
if (buflen!=0) {
strlen=snprintf(buf,buflen, "%02x",*pptr++);
UPDATE_BUF_BUFLEN(buf, buflen, strlen);
}
ttlv_len--;
}
break;
default:
if (buflen!=0) {
strlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
tlv_type,
tlv_len);
UPDATE_BUF_BUFLEN(buf, buflen, strlen);
}
break;
}
tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
}
return plen+2;
} else {
/* complain bitterly ? */
/* fall through */
goto trunc;
}
trunc:
return -2;
}
#ifdef INET6
int
decode_prefix6(const u_char *pd, u_int itemlen, char *buf, u_int buflen)
{
struct in6_addr addr;
u_int plen, plenbytes;
TCHECK(pd[0]);
ITEMCHECK(1);
plen = pd[0];
if (128 < plen)
return -1;
itemlen -= 1;
memset(&addr, 0, sizeof(addr));
plenbytes = (plen + 7) / 8;
TCHECK2(pd[1], plenbytes);
ITEMCHECK(plenbytes);
memcpy(&addr, &pd[1], plenbytes);
if (plen % 8) {
addr.s6_addr[plenbytes - 1] &=
((0xff00 >> (plen % 8)) & 0xff);
}
snprintf(buf, buflen, "%s/%d", getname6((u_char *)&addr), plen);
return 1 + plenbytes;
trunc:
return -2;
badtlv:
return -3;
}
static int
decode_labeled_prefix6(const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
{
struct in6_addr addr;
u_int plen, plenbytes;
/* prefix length and label = 4 bytes */
TCHECK2(pptr[0], 4);
ITEMCHECK(4);
plen = pptr[0]; /* 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;
TCHECK2(pptr[4], plenbytes);
memcpy(&addr, &pptr[4], plenbytes);
if (plen % 8) {
addr.s6_addr[plenbytes - 1] &=
((0xff00 >> (plen % 8)) & 0xff);
}
/* the label may get offsetted by 4 bits so lets shift it right */
snprintf(buf, buflen, "%s/%d, label:%u %s",
getname6((u_char *)&addr),
plen,
EXTRACT_24BITS(pptr+1)>>4,
((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(const u_char *pptr, char *buf, u_int buflen)
{
struct in6_addr addr;
u_int plen;
TCHECK(pptr[0]);
plen = pptr[0]; /* 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));
TCHECK2(pptr[12], (plen + 7) / 8);
memcpy(&addr, &pptr[12], (plen + 7) / 8);
if (plen % 8) {
addr.s6_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/%d, label:%u %s",
bgp_vpn_rd_print(pptr+4),
getname6((u_char *)&addr),
plen,
EXTRACT_24BITS(pptr+1)>>4,
((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
return 12 + (plen + 7) / 8;
trunc:
return -2;
}
#endif
static int
decode_clnp_prefix(const u_char *pptr, char *buf, u_int buflen)
{
u_int8_t addr[19];
u_int plen;
TCHECK(pptr[0]);
plen = pptr[0]; /* get prefix length */
if (152 < plen)
return -1;
memset(&addr, 0, sizeof(addr));
TCHECK2(pptr[4], (plen + 7) / 8);
memcpy(&addr, &pptr[4], (plen + 7) / 8);
if (plen % 8) {
addr[(plen + 7) / 8 - 1] &=
((0xff00 >> (plen % 8)) & 0xff);
}
snprintf(buf, buflen, "%s/%d",
isonsap_string(addr,(plen + 7) / 8),
plen);
return 1 + (plen + 7) / 8;
trunc:
return -2;
}
static int
decode_labeled_vpn_clnp_prefix(const u_char *pptr, char *buf, u_int buflen)
{
u_int8_t addr[19];
u_int plen;
TCHECK(pptr[0]);
plen = pptr[0]; /* 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));
TCHECK2(pptr[12], (plen + 7) / 8);
memcpy(&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/%d, label:%u %s",
bgp_vpn_rd_print(pptr+4),
isonsap_string(addr,(plen + 7) / 8),
plen,
EXTRACT_24BITS(pptr+1)>>4,
((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
return 12 + (plen + 7) / 8;
trunc:
return -2;
}
/*
* 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 int
bgp_attr_get_as_size (u_int8_t bgpa_type, const u_char *pptr, 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) {
TCHECK(tptr[0]);
/*
* If we do not find a valid segment type, our guess might be wrong.
*/
if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) {
goto trunc;
}
TCHECK(tptr[1]);
tptr += 2 + 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;
}
static int
bgp_attr_print(u_int atype, const u_char *pptr, u_int len)
{
int i;
u_int16_t af;
u_int8_t safi, snpa, nhlen;
union { /* copy buffer for bandwidth values */
float f;
u_int32_t i;
} bw;
int advance;
u_int tlen;
const u_char *tptr;
char buf[MAXHOSTNAMELEN + 100];
char tokbuf[TOKBUFSIZE];
int as_size;
tptr = pptr;
tlen=len;
switch (atype) {
case BGPTYPE_ORIGIN:
if (len != 1)
printf("invalid len");
else {
TCHECK(*tptr);
printf("%s", tok2strbuf(bgp_origin_values,
"Unknown Origin Typecode",
tptr[0],
tokbuf, sizeof(tokbuf)));
}
break;
/*
* Process AS4 byte path and AS2 byte path attributes here.
*/
case BGPTYPE_AS4_PATH:
case BGPTYPE_AS_PATH:
if (len % 2) {
printf("invalid len");
break;
}
if (!len) {
printf("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(atype, pptr, len);
while (tptr < pptr + len) {
TCHECK(tptr[0]);
printf("%s", tok2strbuf(bgp_as_path_segment_open_values,
"?", tptr[0],
tokbuf, sizeof(tokbuf)));
for (i = 0; i < tptr[1] * as_size; i += as_size) {
TCHECK2(tptr[2 + i], as_size);
printf("%s ",
as_printf(astostr, sizeof(astostr),
as_size == 2 ?
EXTRACT_16BITS(&tptr[2 + i]) :
EXTRACT_32BITS(&tptr[2 + i])));
}
TCHECK(tptr[0]);
printf("%s", tok2strbuf(bgp_as_path_segment_close_values,
"?", tptr[0],
tokbuf, sizeof(tokbuf)));
TCHECK(tptr[1]);
tptr += 2 + tptr[1] * as_size;
}
break;
case BGPTYPE_NEXT_HOP:
if (len != 4)
printf("invalid len");
else {
TCHECK2(tptr[0], 4);
printf("%s", getname(tptr));
}
break;
case BGPTYPE_MULTI_EXIT_DISC:
case BGPTYPE_LOCAL_PREF:
if (len != 4)
printf("invalid len");
else {
TCHECK2(tptr[0], 4);
printf("%u", EXTRACT_32BITS(tptr));
}
break;
case BGPTYPE_ATOMIC_AGGREGATE:
if (len != 0)
printf("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) {
printf("invalid len");
break;
}
TCHECK2(tptr[0], len);
if (len == 6) {
printf(" AS #%s, origin %s",
as_printf(astostr, sizeof(astostr), EXTRACT_16BITS(tptr)),
getname(tptr + 2));
} else {
printf(" AS #%s, origin %s",
as_printf(astostr, sizeof(astostr),
EXTRACT_32BITS(tptr)), getname(tptr + 4));
}
break;
case BGPTYPE_AGGREGATOR4:
if (len != 8) {
printf("invalid len");
break;
}
TCHECK2(tptr[0], 8);
printf(" AS #%s, origin %s",
as_printf(astostr, sizeof(astostr), EXTRACT_32BITS(tptr)),
getname(tptr + 4));
break;
case BGPTYPE_COMMUNITIES:
if (len % 4) {
printf("invalid len");
break;
}
while (tlen>0) {
u_int32_t comm;
TCHECK2(tptr[0], 4);
comm = EXTRACT_32BITS(tptr);
switch (comm) {
case BGP_COMMUNITY_NO_EXPORT:
printf(" NO_EXPORT");
break;
case BGP_COMMUNITY_NO_ADVERT:
printf(" NO_ADVERTISE");
break;
case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
printf(" NO_EXPORT_SUBCONFED");
break;
default:
printf("%u:%u%s",
(comm >> 16) & 0xffff,
comm & 0xffff,
(tlen>4) ? ", " : "");
break;
}
tlen -=4;
tptr +=4;
}
break;
case BGPTYPE_ORIGINATOR_ID:
if (len != 4) {
printf("invalid len");
break;
}
TCHECK2(tptr[0], 4);
printf("%s",getname(tptr));
break;
case BGPTYPE_CLUSTER_LIST:
if (len % 4) {
printf("invalid len");
break;
}
while (tlen>0) {
TCHECK2(tptr[0], 4);
printf("%s%s",
getname(tptr),
(tlen>4) ? ", " : "");
tlen -=4;
tptr +=4;
}
break;
case BGPTYPE_MP_REACH_NLRI:
TCHECK2(tptr[0], 3);
af = EXTRACT_16BITS(tptr);
safi = tptr[2];
printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
tok2strbuf(af_values, "Unknown AFI", af,
tokbuf, sizeof(tokbuf)),
af,
(safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
tok2strbuf(bgp_safi_values, "Unknown SAFI", safi,
tokbuf, sizeof(tokbuf)),
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):
#ifdef INET6
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):
#endif
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:
TCHECK2(tptr[0], tlen);
printf("\n\t no AFI %u / SAFI %u decoder",af,safi);
if (vflag <= 1)
print_unknown_data(tptr,"\n\t ",tlen);
goto done;
break;
}
tptr +=3;
TCHECK(tptr[0]);
nhlen = tptr[0];
tlen = nhlen;
tptr++;
if (tlen) {
int nnh = 0;
printf("\n\t nexthop: ");
while (tlen > 0) {
if ( nnh++ > 0 ) {
printf( ", " );
}
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 (tlen < (int)sizeof(struct in_addr)) {
printf("invalid len");
tlen = 0;
} else {
TCHECK2(tptr[0], sizeof(struct in_addr));
printf("%s",getname(tptr));
tlen -= sizeof(struct in_addr);
tptr += sizeof(struct in_addr);
}
break;
case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) {
printf("invalid len");
tlen = 0;
} else {
TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN);
printf("RD: %s, %s",
bgp_vpn_rd_print(tptr),
getname(tptr+BGP_VPN_RD_LEN));
tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
}
break;
#ifdef INET6
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 (tlen < (int)sizeof(struct in6_addr)) {
printf("invalid len");
tlen = 0;
} else {
TCHECK2(tptr[0], sizeof(struct in6_addr));
printf("%s", getname6(tptr));
tlen -= sizeof(struct in6_addr);
tptr += sizeof(struct in6_addr);
}
break;
case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) {
printf("invalid len");
tlen = 0;
} else {
TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
printf("RD: %s, %s",
bgp_vpn_rd_print(tptr),
getname6(tptr+BGP_VPN_RD_LEN));
tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
}
break;
#endif
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 (tlen < (int)sizeof(struct in_addr)) {
printf("invalid len");
tlen = 0;
} else {
TCHECK2(tptr[0], sizeof(struct in_addr));
printf("%s", getname(tptr));
tlen -= (sizeof(struct in_addr));
tptr += (sizeof(struct in_addr));
}
break;
case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
TCHECK2(tptr[0], tlen);
printf("%s",isonsap_string(tptr,tlen));
tptr += tlen;
tlen = 0;
break;
case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
if (tlen < BGP_VPN_RD_LEN+1) {
printf("invalid len");
tlen = 0;
} else {
TCHECK2(tptr[0], tlen);
printf("RD: %s, %s",
bgp_vpn_rd_print(tptr),
isonsap_string(tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN));
/* rfc986 mapped IPv4 address ? */
if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601)
printf(" = %s", getname(tptr+BGP_VPN_RD_LEN+4));
#ifdef INET6
/* rfc1888 mapped IPv6 address ? */
else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000)
printf(" = %s", getname6(tptr+BGP_VPN_RD_LEN+3));
#endif
tptr += tlen;
tlen = 0;
}
break;
default:
TCHECK2(tptr[0], tlen);
printf("no AFI %u/SAFI %u decoder",af,safi);
if (vflag <= 1)
print_unknown_data(tptr,"\n\t ",tlen);
tptr += tlen;
tlen = 0;
goto done;
break;
}
}
}
printf(", nh-length: %u", nhlen);
tptr += tlen;
TCHECK(tptr[0]);
snpa = tptr[0];
tptr++;
if (snpa) {
printf("\n\t %u SNPA", snpa);
for (/*nothing*/; snpa > 0; snpa--) {
TCHECK(tptr[0]);
printf("\n\t %d bytes", tptr[0]);
tptr += tptr[0] + 1;
}
} else {
printf(", no SNPA");
}
while (len - (tptr - pptr) > 0) {
switch (af<<8 | safi) {
case (AFNUM_INET<<8 | SAFNUM_UNICAST):
case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
advance = decode_prefix4(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else if (advance == -3)
break; /* bytes left, but not enough */
else
printf("\n\t %s", buf);
break;
case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
advance = decode_labeled_prefix4(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else if (advance == -3)
break; /* bytes left, but not enough */
else
printf("\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(tptr, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else
printf("\n\t %s", buf);
break;
case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
advance = decode_rt_routing_info(tptr, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else
printf("\n\t %s", buf);
break;
case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
advance = decode_multicast_vpn(tptr, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else
printf("\n\t %s", buf);
break;
case (AFNUM_INET<<8 | SAFNUM_MDT):
advance = decode_mdt_vpn_nlri(tptr, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else
printf("\n\t %s", buf);
break;
#ifdef INET6
case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
advance = decode_prefix6(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else if (advance == -3)
break; /* bytes left, but not enough */
else
printf("\n\t %s", buf);
break;
case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
advance = decode_labeled_prefix6(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else if (advance == -3)
break; /* bytes left, but not enough */
else
printf("\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(tptr, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else
printf("\n\t %s", buf);
break;
#endif
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(tptr, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal length)");
else if (advance == -2)
goto trunc;
else
printf("\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(tptr, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else
printf("\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(tptr, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else
printf("\n\t %s", buf);
break;
default:
TCHECK2(*tptr,tlen);
printf("\n\t no AFI %u / SAFI %u decoder",af,safi);
if (vflag <= 1)
print_unknown_data(tptr,"\n\t ",tlen);
advance = 0;
tptr = pptr + len;
break;
}
if (advance < 0)
break;
tptr += advance;
}
done:
break;
case BGPTYPE_MP_UNREACH_NLRI:
TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE);
af = EXTRACT_16BITS(tptr);
safi = tptr[2];
printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
tok2strbuf(af_values, "Unknown AFI", af,
tokbuf, sizeof(tokbuf)),
af,
(safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
tok2strbuf(bgp_safi_values, "Unknown SAFI", safi,
tokbuf, sizeof(tokbuf)),
safi);
if (len == BGP_MP_NLRI_MINSIZE)
printf("\n\t End-of-Rib Marker (empty NLRI)");
tptr += 3;
while (len - (tptr - pptr) > 0) {
switch (af<<8 | safi) {
case (AFNUM_INET<<8 | SAFNUM_UNICAST):
case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
advance = decode_prefix4(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else if (advance == -3)
break; /* bytes left, but not enough */
else
printf("\n\t %s", buf);
break;
case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
advance = decode_labeled_prefix4(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else if (advance == -3)
break; /* bytes left, but not enough */
else
printf("\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(tptr, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else
printf("\n\t %s", buf);
break;
#ifdef INET6
case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
advance = decode_prefix6(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else if (advance == -3)
break; /* bytes left, but not enough */
else
printf("\n\t %s", buf);
break;
case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
advance = decode_labeled_prefix6(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else if (advance == -3)
break; /* bytes left, but not enough */
else
printf("\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(tptr, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else
printf("\n\t %s", buf);
break;
#endif
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(tptr, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal length)");
else if (advance == -2)
goto trunc;
else
printf("\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(tptr, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else
printf("\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(tptr, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else
printf("\n\t %s", buf);
break;
case (AFNUM_INET<<8 | SAFNUM_MDT):
advance = decode_mdt_vpn_nlri(tptr, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else
printf("\n\t %s", buf);
break;
case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
advance = decode_multicast_vpn(tptr, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
else
printf("\n\t %s", buf);
break;
default:
TCHECK2(*(tptr-3),tlen);
printf("no AFI %u / SAFI %u decoder",af,safi);
if (vflag <= 1)
print_unknown_data(tptr-3,"\n\t ",tlen);
advance = 0;
tptr = pptr + len;
break;
}
if (advance < 0)
break;
tptr += advance;
}
break;
case BGPTYPE_EXTD_COMMUNITIES:
if (len % 8) {
printf("invalid len");
break;
}
while (tlen>0) {
u_int16_t extd_comm;
TCHECK2(tptr[0], 2);
extd_comm=EXTRACT_16BITS(tptr);
printf("\n\t %s (0x%04x), Flags [%s]",
tok2strbuf(bgp_extd_comm_subtype_values,
"unknown extd community typecode",
extd_comm, tokbuf, sizeof(tokbuf)),
extd_comm,
bittok2str(bgp_extd_comm_flag_values, "none", extd_comm));
TCHECK2(*(tptr+2), 6);
switch(extd_comm) {
case BGP_EXT_COM_RT_0:
case BGP_EXT_COM_RO_0:
case BGP_EXT_COM_L2VPN_RT_0:
printf(": %u:%u (= %s)",
EXTRACT_16BITS(tptr+2),
EXTRACT_32BITS(tptr+4),
getname(tptr+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:
printf(": %s:%u",
getname(tptr+2),
EXTRACT_16BITS(tptr+6));
break;
case BGP_EXT_COM_RT_2:
case BGP_EXT_COM_RO_2:
printf(": %s:%u",
as_printf(astostr, sizeof(astostr),
EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6));
break;
case BGP_EXT_COM_LINKBAND:
bw.i = EXTRACT_32BITS(tptr+2);
printf(": 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:
printf("%s", getname(tptr+2));
break;
case BGP_EXT_COM_OSPF_RTYPE:
case BGP_EXT_COM_OSPF_RTYPE2:
printf(": area:%s, router-type:%s, metric-type:%s%s",
getname(tptr+2),
tok2strbuf(bgp_extd_comm_ospf_rtype_values,
"unknown (0x%02x)",
*(tptr+6),
tokbuf, sizeof(tokbuf)),
(*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "");
break;
case BGP_EXT_COM_L2INFO:
printf(": %s Control Flags [0x%02x]:MTU %u",
tok2strbuf(l2vpn_encaps_values,
"unknown encaps",
*(tptr+2),
tokbuf, sizeof(tokbuf)),
*(tptr+3),
EXTRACT_16BITS(tptr+4));
break;
case BGP_EXT_COM_SOURCE_AS:
printf(": AS %u", EXTRACT_16BITS(tptr+2));
break;
default:
TCHECK2(*tptr,8);
print_unknown_data(tptr,"\n\t ",8);
break;
}
tlen -=8;
tptr +=8;
}
break;
case BGPTYPE_PMSI_TUNNEL:
{
u_int8_t tunnel_type, flags;
tunnel_type = *(tptr+1);
flags = *tptr;
tlen = len;
TCHECK2(tptr[0], 5);
printf("\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),
EXTRACT_24BITS(tptr+2)>>4);
tptr +=5;
tlen -= 5;
switch (tunnel_type) {
case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
case BGP_PMSI_TUNNEL_PIM_BIDIR:
TCHECK2(tptr[0], 8);
printf("\n\t Sender %s, P-Group %s",
ipaddr_string(tptr),
ipaddr_string(tptr+4));
break;
case BGP_PMSI_TUNNEL_PIM_SSM:
TCHECK2(tptr[0], 8);
printf("\n\t Root-Node %s, P-Group %s",
ipaddr_string(tptr),
ipaddr_string(tptr+4));
break;
case BGP_PMSI_TUNNEL_INGRESS:
TCHECK2(tptr[0], 4);
printf("\n\t Tunnel-Endpoint %s",
ipaddr_string(tptr));
break;
case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
case BGP_PMSI_TUNNEL_LDP_MP2MP:
TCHECK2(tptr[0], 8);
printf("\n\t Root-Node %s, LSP-ID 0x%08x",
ipaddr_string(tptr),
EXTRACT_32BITS(tptr+4));
break;
case BGP_PMSI_TUNNEL_RSVP_P2MP:
TCHECK2(tptr[0], 8);
printf("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
ipaddr_string(tptr),
EXTRACT_32BITS(tptr+4));
break;
default:
if (vflag <= 1) {
print_unknown_data(tptr,"\n\t ",tlen);
}
}
break;
}
case BGPTYPE_ATTR_SET:
TCHECK2(tptr[0], 4);
if (len < 4)
goto trunc;
printf("\n\t Origin AS: %s",
as_printf(astostr, sizeof(astostr), EXTRACT_32BITS(tptr)));
tptr+=4;
len -=4;
while (len) {
u_int aflags, atype, alenlen, alen;
TCHECK2(tptr[0], 2);
if (len < 2)
goto trunc;
aflags = *tptr;
atype = *(tptr + 1);
tptr += 2;
len -= 2;
alenlen = bgp_attr_lenlen(aflags, tptr);
TCHECK2(tptr[0], alenlen);
if (len < alenlen)
goto trunc;
alen = bgp_attr_len(aflags, tptr);
tptr += alenlen;
len -= alenlen;
printf("\n\t %s (%u), length: %u",
tok2strbuf(bgp_attr_values,
"Unknown Attribute", atype,
tokbuf, sizeof(tokbuf)),
atype,
alen);
if (aflags) {
printf(", Flags [%s%s%s%s",
aflags & 0x80 ? "O" : "",
aflags & 0x40 ? "T" : "",
aflags & 0x20 ? "P" : "",
aflags & 0x10 ? "E" : "");
if (aflags & 0xf)
printf("+%x", aflags & 0xf);
printf("]: ");
}
/* FIXME check for recursion */
if (!bgp_attr_print(atype, tptr, alen))
return 0;
tptr += alen;
len -= alen;
}
break;
default:
TCHECK2(*pptr,len);
printf("\n\t no Attribute %u decoder",atype); /* we have no decoder for the attribute */
if (vflag <= 1)
print_unknown_data(pptr,"\n\t ",len);
break;
}
if (vflag > 1 && len) { /* omit zero length attributes*/
TCHECK2(*pptr,len);
print_unknown_data(pptr,"\n\t ",len);
}
return 1;
trunc:
return 0;
}
static void
bgp_capabilities_print(const u_char *opt, int caps_len)
{
char tokbuf[TOKBUFSIZE];
char tokbuf2[TOKBUFSIZE];
int cap_type, cap_len, tcap_len, cap_offset;
int i = 0;
while (i < caps_len) {
TCHECK2(opt[i], BGP_CAP_HEADER_SIZE);
cap_type=opt[i];
cap_len=opt[i+1];
tcap_len=cap_len;
printf("\n\t %s (%u), length: %u",
tok2strbuf(bgp_capcode_values, "Unknown",
cap_type, tokbuf, sizeof(tokbuf)),
cap_type,
cap_len);
TCHECK2(opt[i+2], cap_len);
switch (cap_type) {
case BGP_CAPCODE_MP:
printf("\n\t\tAFI %s (%u), SAFI %s (%u)",
tok2strbuf(af_values, "Unknown",
EXTRACT_16BITS(opt+i+2),
tokbuf, sizeof(tokbuf)),
EXTRACT_16BITS(opt+i+2),
tok2strbuf(bgp_safi_values, "Unknown",
opt[i+5],
tokbuf, sizeof(tokbuf)),
opt[i+5]);
break;
case BGP_CAPCODE_RESTART:
printf("\n\t\tRestart Flags: [%s], Restart Time %us",
((opt[i+2])&0x80) ? "R" : "none",
EXTRACT_16BITS(opt+i+2)&0xfff);
tcap_len-=2;
cap_offset=4;
while(tcap_len>=4) {
printf("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
tok2strbuf(af_values,"Unknown",
EXTRACT_16BITS(opt+i+cap_offset),
tokbuf, sizeof(tokbuf)),
EXTRACT_16BITS(opt+i+cap_offset),
tok2strbuf(bgp_safi_values,"Unknown",
opt[i+cap_offset+2],
tokbuf2, sizeof(tokbuf2)),
opt[i+cap_offset+2],
((opt[i+cap_offset+3])&0x80) ? "yes" : "no" );
tcap_len-=4;
cap_offset+=4;
}
break;
case BGP_CAPCODE_RR:
case BGP_CAPCODE_RR_CISCO:
break;
case BGP_CAPCODE_AS_NEW:
/*
* Extract the 4 byte AS number encoded.
*/
if (cap_len == 4) {
printf("\n\t\t 4 Byte AS %s",
as_printf(astostr, sizeof(astostr),
EXTRACT_32BITS(opt + i + 2)));
}
break;
default:
printf("\n\t\tno decoder for Capability %u",
cap_type);
if (vflag <= 1)
print_unknown_data(&opt[i+2],"\n\t\t",cap_len);
break;
}
if (vflag > 1 && cap_len > 0) {
print_unknown_data(&opt[i+2],"\n\t\t",cap_len);
}
i += BGP_CAP_HEADER_SIZE + cap_len;
}
return;
trunc:
printf("[|BGP]");
}
static void
bgp_open_print(const u_char *dat, int length)
{
struct bgp_open bgpo;
struct bgp_opt bgpopt;
const u_char *opt;
int i;
char tokbuf[TOKBUFSIZE];
TCHECK2(dat[0], BGP_OPEN_SIZE);
memcpy(&bgpo, dat, BGP_OPEN_SIZE);
printf("\n\t Version %d, ", bgpo.bgpo_version);
printf("my AS %s, ",
as_printf(astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas)));
printf("Holdtime %us, ", ntohs(bgpo.bgpo_holdtime));
printf("ID %s", getname((u_char *)&bgpo.bgpo_id));
printf("\n\t Optional parameters, length: %u", bgpo.bgpo_optlen);
/* some little sanity checking */
if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE)
return;
/* ugly! */
opt = &((const struct bgp_open *)dat)->bgpo_optlen;
opt++;
i = 0;
while (i < bgpo.bgpo_optlen) {
TCHECK2(opt[i], BGP_OPT_SIZE);
memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE);
if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
printf("\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len);
break;
}
printf("\n\t Option %s (%u), length: %u",
tok2strbuf(bgp_opt_values,"Unknown",
bgpopt.bgpopt_type,
tokbuf, sizeof(tokbuf)),
bgpopt.bgpopt_type,
bgpopt.bgpopt_len);
/* now let's decode the options we know*/
switch(bgpopt.bgpopt_type) {
case BGP_OPT_CAP:
bgp_capabilities_print(&opt[i+BGP_OPT_SIZE],
bgpopt.bgpopt_len);
break;
case BGP_OPT_AUTH:
default:
printf("\n\t no decoder for option %u",
bgpopt.bgpopt_type);
break;
}
i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
}
return;
trunc:
printf("[|BGP]");
}
static void
bgp_update_print(const u_char *dat, int length)
{
struct bgp bgp;
const u_char *p;
int withdrawn_routes_len;
int len;
int i;
char tokbuf[TOKBUFSIZE];
#ifndef INET6
char buf[MAXHOSTNAMELEN + 100];
int wpfx;
#endif
TCHECK2(dat[0], BGP_SIZE);
if (length < BGP_SIZE)
goto trunc;
memcpy(&bgp, dat, BGP_SIZE);
p = dat + BGP_SIZE; /*XXX*/
length -= BGP_SIZE;
/* Unfeasible routes */
TCHECK2(p[0], 2);
if (length < 2)
goto trunc;
withdrawn_routes_len = EXTRACT_16BITS(p);
p += 2;
length -= 2;
if (withdrawn_routes_len) {
/*
* 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.
*/
TCHECK2(p[0], withdrawn_routes_len);
if (length < withdrawn_routes_len)
goto trunc;
#ifdef INET6
printf("\n\t Withdrawn routes: %d bytes", withdrawn_routes_len);
p += withdrawn_routes_len;
length -= withdrawn_routes_len;
#else
if (withdrawn_routes_len < 2)
goto trunc;
length -= 2;
withdrawn_routes_len -= 2;
printf("\n\t Withdrawn routes:");
while(withdrawn_routes_len > 0) {
wpfx = decode_prefix4(p, withdrawn_routes_len, buf, sizeof(buf));
if (wpfx == -1) {
printf("\n\t (illegal prefix length)");
break;
} else if (wpfx == -2)
goto trunc;
else if (wpfx == -3)
goto trunc; /* bytes left, but not enough */
else {
printf("\n\t %s", buf);
p += wpfx;
length -= wpfx;
withdrawn_routes_len -= wpfx;
}
}
#endif
}
TCHECK2(p[0], 2);
if (length < 2)
goto trunc;
len = EXTRACT_16BITS(p);
p += 2;
length -= 2;
if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
/* No withdrawn routes, no path attributes, no NLRI */
printf("\n\t End-of-Rib Marker (empty NLRI)");
return;
}
if (len) {
/* do something more useful!*/
while (len) {
int aflags, atype, alenlen, alen;
TCHECK2(p[0], 2);
if (len < 2)
goto trunc;
if (length < 2)
goto trunc;
aflags = *p;
atype = *(p + 1);
p += 2;
len -= 2;
length -= 2;
alenlen = bgp_attr_lenlen(aflags, p);
TCHECK2(p[0], alenlen);
if (len < alenlen)
goto trunc;
if (length < alenlen)
goto trunc;
alen = bgp_attr_len(aflags, p);
p += alenlen;
len -= alenlen;
length -= alenlen;
printf("\n\t %s (%u), length: %u",
tok2strbuf(bgp_attr_values, "Unknown Attribute",
atype,
tokbuf, sizeof(tokbuf)),
atype,
alen);
if (aflags) {
printf(", Flags [%s%s%s%s",
aflags & 0x80 ? "O" : "",
aflags & 0x40 ? "T" : "",
aflags & 0x20 ? "P" : "",
aflags & 0x10 ? "E" : "");
if (aflags & 0xf)
printf("+%x", aflags & 0xf);
printf("]: ");
}
if (len < alen)
goto trunc;
if (length < alen)
goto trunc;
if (!bgp_attr_print(atype, p, alen))
goto trunc;
p += alen;
len -= alen;
length -= alen;
}
}
if (length) {
/*
* XXX - what if they're using the "Advertisement of
* Multiple Paths in BGP" feature:
*
* https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/
*
* http://tools.ietf.org/html/draft-ietf-idr-add-paths-06
*/
printf("\n\t Updated routes:");
while (length) {
char buf[MAXHOSTNAMELEN + 100];
i = decode_prefix4(p, length, buf, sizeof(buf));
if (i == -1) {
printf("\n\t (illegal prefix length)");
break;
} else if (i == -2)
goto trunc;
else if (i == -3)
goto trunc; /* bytes left, but not enough */
else {
printf("\n\t %s", buf);
p += i;
length -= i;
}
}
}
return;
trunc:
printf("[|BGP]");
}
static void
bgp_notification_print(const u_char *dat, int length)
{
struct bgp_notification bgpn;
const u_char *tptr;
char tokbuf[TOKBUFSIZE];
char tokbuf2[TOKBUFSIZE];
TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
/* some little sanity checking */
if (length<BGP_NOTIFICATION_SIZE)
return;
printf(", %s (%u)",
tok2strbuf(bgp_notify_major_values, "Unknown Error",
bgpn.bgpn_major, tokbuf, sizeof(tokbuf)),
bgpn.bgpn_major);
switch (bgpn.bgpn_major) {
case BGP_NOTIFY_MAJOR_MSG:
printf(", subcode %s (%u)",
tok2strbuf(bgp_notify_minor_msg_values, "Unknown",
bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
bgpn.bgpn_minor);
break;
case BGP_NOTIFY_MAJOR_OPEN:
printf(", subcode %s (%u)",
tok2strbuf(bgp_notify_minor_open_values, "Unknown",
bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
bgpn.bgpn_minor);
break;
case BGP_NOTIFY_MAJOR_UPDATE:
printf(", subcode %s (%u)",
tok2strbuf(bgp_notify_minor_update_values, "Unknown",
bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
bgpn.bgpn_minor);
break;
case BGP_NOTIFY_MAJOR_CAP:
printf(" subcode %s (%u)",
tok2strbuf(bgp_notify_minor_cap_values, "Unknown",
bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
bgpn.bgpn_minor);
case BGP_NOTIFY_MAJOR_CEASE:
printf(", subcode %s (%u)",
tok2strbuf(bgp_notify_minor_cease_values, "Unknown",
bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)),
bgpn.bgpn_minor);
/* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
* for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
*/
if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
tptr = dat + BGP_NOTIFICATION_SIZE;
TCHECK2(*tptr, 7);
printf(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
tok2strbuf(af_values, "Unknown",
EXTRACT_16BITS(tptr), tokbuf, sizeof(tokbuf)),
EXTRACT_16BITS(tptr),
tok2strbuf(bgp_safi_values, "Unknown", *(tptr+2),
tokbuf2, sizeof(tokbuf)),
*(tptr+2),
EXTRACT_32BITS(tptr+3));
}
break;
default:
break;
}
return;
trunc:
printf("[|BGP]");
}
static void
bgp_route_refresh_print(const u_char *pptr, int len) {
const struct bgp_route_refresh *bgp_route_refresh_header;
char tokbuf[TOKBUFSIZE];
char tokbuf2[TOKBUFSIZE];
TCHECK2(pptr[0], 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;
printf("\n\t AFI %s (%u), SAFI %s (%u)",
tok2strbuf(af_values,"Unknown",
/* this stinks but the compiler pads the structure
* weird */
EXTRACT_16BITS(&bgp_route_refresh_header->afi),
tokbuf, sizeof(tokbuf)),
EXTRACT_16BITS(&bgp_route_refresh_header->afi),
tok2strbuf(bgp_safi_values,"Unknown",
bgp_route_refresh_header->safi,
tokbuf2, sizeof(tokbuf2)),
bgp_route_refresh_header->safi);
if (vflag > 1) {
TCHECK2(*pptr, len);
print_unknown_data(pptr,"\n\t ", len);
}
return;
trunc:
printf("[|BGP]");
}
static int
bgp_header_print(const u_char *dat, int length)
{
struct bgp bgp;
char tokbuf[TOKBUFSIZE];
TCHECK2(dat[0], BGP_SIZE);
memcpy(&bgp, dat, BGP_SIZE);
printf("\n\t%s Message (%u), length: %u",
tok2strbuf(bgp_msg_values, "Unknown", bgp.bgp_type,
tokbuf, sizeof(tokbuf)),
bgp.bgp_type,
length);
switch (bgp.bgp_type) {
case BGP_OPEN:
bgp_open_print(dat, length);
break;
case BGP_UPDATE:
bgp_update_print(dat, length);
break;
case BGP_NOTIFICATION:
bgp_notification_print(dat, length);
break;
case BGP_KEEPALIVE:
break;
case BGP_ROUTE_REFRESH:
bgp_route_refresh_print(dat, length);
break;
default:
/* we have no decoder for the BGP message */
TCHECK2(*dat, length);
printf("\n\t no Message %u decoder",bgp.bgp_type);
print_unknown_data(dat,"\n\t ",length);
break;
}
return 1;
trunc:
printf("[|BGP]");
return 0;
}
void
bgp_print(const u_char *dat, int length)
{
const u_char *p;
const u_char *ep;
const u_char *start;
const u_char marker[] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
};
struct bgp bgp;
u_int16_t hlen;
char tokbuf[TOKBUFSIZE];
ep = dat + length;
if (snapend < dat + length)
ep = snapend;
printf(": BGP, length: %u",length);
if (vflag < 1) /* lets be less chatty */
return;
p = dat;
start = p;
while (p < ep) {
if (!TTEST2(p[0], 1))
break;
if (p[0] != 0xff) {
p++;
continue;
}
if (!TTEST2(p[0], sizeof(marker)))
break;
if (memcmp(p, marker, sizeof(marker)) != 0) {
p++;
continue;
}
/* found BGP header */
TCHECK2(p[0], BGP_SIZE); /*XXX*/
memcpy(&bgp, p, BGP_SIZE);
if (start != p)
printf(" [|BGP]");
hlen = ntohs(bgp.bgp_len);
if (hlen < BGP_SIZE) {
printf("\n[|BGP Bogus header length %u < %u]", hlen,
BGP_SIZE);
break;
}
if (TTEST2(p[0], hlen)) {
if (!bgp_header_print(p, hlen))
return;
p += hlen;
start = p;
} else {
printf("\n[|BGP %s]",
tok2strbuf(bgp_msg_values,
"Unknown Message Type",
bgp.bgp_type,
tokbuf, sizeof(tokbuf)));
break;
}
}
return;
trunc:
printf(" [|BGP]");
}
/*
* Local Variables:
* c-style: whitesmith
* c-basic-offset: 4
* End:
*/