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tcpdump/print-bgp.c

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/*
* Copyright (C) 1999 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Extensively modified by Hannes Gredler (hannes@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 1.79 2004-03-16 11:39:59 hannes Exp $";
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.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 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 */
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
struct bgp_attr {
u_int8_t bgpa_flags;
u_int8_t bgpa_type;
union {
u_int8_t len;
u_int16_t elen;
} bgpa_len;
#define bgp_attr_len(p) \
(((p)->bgpa_flags & 0x10) ? \
EXTRACT_16BITS(&(p)->bgpa_len.elen) : (p)->bgpa_len.len)
#define bgp_attr_off(p) \
(((p)->bgpa_flags & 0x10) ? 4 : 3)
};
#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_ATTR_SET 128 /* draft-marques-ppvpn-ibgp */
static struct tok bgp_attr_values[] = {
{ BGPTYPE_ORIGIN, "Origin"},
{ BGPTYPE_AS_PATH, "AS 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_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_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 */
static 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 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 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_RESTART 64 /* draft-ietf-idr-restart-05 */
#define BGP_CAPCODE_RR_CISCO 128
static struct tok bgp_capcode_values[] = {
{ BGP_CAPCODE_MP, "Multiprotocol Extensions"},
{ BGP_CAPCODE_RR, "Route Refresh"},
{ BGP_CAPCODE_RESTART, "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 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 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 struct tok bgp_notify_minor_msg_values[] = {
{ 1, "Connection Not Synchronized"},
{ 2, "Bad Message Length"},
{ 3, "Bad Message Type"},
{ 0, NULL}
};
static 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"},
{ 0, NULL}
};
static 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 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 struct tok bgp_origin_values[] = {
{ 0, "IGP"},
{ 1, "EGP"},
{ 2, "Incomplete"},
{ 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
/* 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 struct tok bgp_safi_values[] = {
{ SAFNUM_RES, "Reserved"},
{ SAFNUM_UNICAST, "Unicast"},
{ SAFNUM_MULTICAST, "Multicast"},
{ SAFNUM_UNIMULTICAST, "Unicast+Multicast"},
{ SAFNUM_LABUNICAST, "labeled Unicast"},
{ SAFNUM_VPNUNICAST, "labeled VPN Unicast"},
{ SAFNUM_VPNMULTICAST, "labeled VPN Multicast"},
{ SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"},
{ SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"}, /* draft-marques-ppvpn-rt-constrain-01.txt */
{ 0, NULL }
};
/* well-known community */
#define BGP_COMMUNITY_NO_EXPORT 0xffffff01
#define BGP_COMMUNITY_NO_ADVERT 0xffffff02
#define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
/* RFC1700 address family numbers */
#define AFNUM_INET 1
#define AFNUM_INET6 2
#define AFNUM_NSAP 3
#define AFNUM_HDLC 4
#define AFNUM_BBN1822 5
#define AFNUM_802 6
#define AFNUM_E163 7
#define AFNUM_E164 8
#define AFNUM_F69 9
#define AFNUM_X121 10
#define AFNUM_IPX 11
#define AFNUM_ATALK 12
#define AFNUM_DECNET 13
#define AFNUM_BANYAN 14
#define AFNUM_E164NSAP 15
/* draft-kompella-ppvpn-l2vpn */
#define AFNUM_L2VPN 196 /* still to be approved by IANA */
static struct tok bgp_afi_values[] = {
{ 0, "Reserved"},
{ AFNUM_INET, "IPv4"},
{ AFNUM_INET6, "IPv6"},
{ AFNUM_NSAP, "NSAP"},
{ AFNUM_HDLC, "HDLC"},
{ AFNUM_BBN1822, "BBN 1822"},
{ AFNUM_802, "802"},
{ AFNUM_E163, "E.163"},
{ AFNUM_E164, "E.164"},
{ AFNUM_F69, "F.69"},
{ AFNUM_X121, "X.121"},
{ AFNUM_IPX, "Novell IPX"},
{ AFNUM_ATALK, "Appletalk"},
{ AFNUM_DECNET, "Decnet IV"},
{ AFNUM_BANYAN, "Banyan Vines"},
{ AFNUM_E164NSAP, "E.164 with NSAP subaddress"},
{ AFNUM_L2VPN, "Layer-2 VPN"},
{ 0, NULL},
};
/* 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_CISCO_MCAST 0x0009 /* cisco proprietary */
#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 */
static struct tok bgp_extd_comm_flag_values[] = {
{ 0x8000, "vendor-specific"},
{ 0x4000, "non-transitive"},
{ 0, NULL},
};
static 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_CISCO_MCAST, "mdt-group"},
{ 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"},
{ 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 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 },
};
static struct tok bgp_l2vpn_encaps_values[] = {
{ 0, "Reserved"},
{ 1, "Frame Relay"},
{ 2, "ATM AAL5 VCC transport"},
{ 3, "ATM transparent cell transport"},
{ 4, "Ethernet VLAN"},
{ 5, "Ethernet"},
{ 6, "Cisco-HDLC"},
{ 7, "PPP"},
{ 8, "CEM"},
{ 9, "ATM VCC cell transport"},
{ 10, "ATM VPC cell transport"},
{ 11, "MPLS"},
{ 12, "VPLS"},
{ 64, "IP-interworking"},
{ 0, NULL},
};
static int
decode_prefix4(const u_char *pptr, char *buf, u_int buflen)
{
struct in_addr addr;
u_int plen;
plen = pptr[0];
if (32 < plen)
return -1;
memset(&addr, 0, sizeof(addr));
memcpy(&addr, &pptr[1], (plen + 7) / 8);
if (plen % 8) {
((u_char *)&addr)[(plen + 7) / 8 - 1] &=
((0xff00 >> (plen % 8)) & 0xff);
}
snprintf(buf, buflen, "%s/%d", getname((u_char *)&addr), plen);
return 1 + (plen + 7) / 8;
}
static int
decode_labeled_prefix4(const u_char *pptr, char *buf, u_int buflen)
{
struct in_addr addr;
u_int plen;
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
*/
plen-=24; /* adjust prefixlen - labellength */
if (32 < plen)
return -1;
memset(&addr, 0, sizeof(addr));
memcpy(&addr, &pptr[4], (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, "%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 + (plen + 7) / 8;
}
/* RDs and RTs share the same semantics
* we use bgp_vpn_rd_print for
* printing route targets inside a NLRI */
static 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)) {
/* AS:IP-address fmt*/
case 0:
snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u.%u.%u.%u",
EXTRACT_16BITS(pptr+2), *(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), "%u:%u (%u.%u.%u.%u:%u)",
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;
plen = pptr[0]; /* get prefix length */
plen-=32; /* adjust prefix length */
if (0 < plen)
return -1;
memset(&route_target, 0, sizeof(route_target));
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: %u, route target %s",
EXTRACT_32BITS(pptr+1),
bgp_vpn_rd_print((u_char *)&route_target));
return 5 + (plen + 7) / 8;
}
static int
decode_labeled_vpn_prefix4(const u_char *pptr, char *buf, u_int buflen)
{
struct in_addr addr;
u_int plen;
plen = pptr[0]; /* get prefix length */
plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
if (32 < plen)
return -1;
memset(&addr, 0, sizeof(addr));
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;
}
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;
plen=EXTRACT_16BITS(pptr);
tlen=plen;
pptr+=2;
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 */
pptr+=15;
tlen-=15;
/* ok now the variable part - lets read out TLVs*/
while (tlen>0) {
tlv_type=*pptr++;
tlv_len=EXTRACT_16BITS(pptr);
ttlv_len=tlv_len;
pptr+=2;
switch(tlv_type) {
case 1:
strlen+=snprintf(buf+strlen,buflen-strlen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
tlv_type,
tlv_len);
ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
while (ttlv_len>0) {
strlen+=snprintf(buf+strlen,buflen-strlen, "%02x",*pptr++);
ttlv_len--;
}
break;
default:
snprintf(buf+strlen,buflen-strlen, "\n\t\tunknown TLV #%u, length: %u",
tlv_type,
tlv_len);
break;
}
tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it tright */
}
return plen+2;
}
#ifdef INET6
static int
decode_prefix6(const u_char *pd, char *buf, u_int buflen)
{
struct in6_addr addr;
u_int plen;
plen = pd[0];
if (128 < plen)
return -1;
memset(&addr, 0, sizeof(addr));
memcpy(&addr, &pd[1], (plen + 7) / 8);
if (plen % 8) {
addr.s6_addr[(plen + 7) / 8 - 1] &=
((0xff00 >> (plen % 8)) & 0xff);
}
snprintf(buf, buflen, "%s/%d", getname6((u_char *)&addr), plen);
return 1 + (plen + 7) / 8;
}
static int
decode_labeled_prefix6(const u_char *pptr, char *buf, u_int buflen)
{
struct in6_addr addr;
u_int plen;
plen = pptr[0]; /* get prefix length */
plen-=24; /* adjust prefixlen - labellength */
if (128 < plen)
return -1;
memset(&addr, 0, sizeof(addr));
memcpy(&addr, &pptr[4], (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, "%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 + (plen + 7) / 8;
}
static int
decode_labeled_vpn_prefix6(const u_char *pptr, char *buf, u_int buflen)
{
struct in6_addr addr;
u_int plen;
plen = pptr[0]; /* get prefix length */
plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
if (128 < plen)
return -1;
memset(&addr, 0, sizeof(addr));
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;
}
#endif
static void
bgp_attr_print(const struct bgp_attr *attr, const u_char *pptr, int len)
{
int i;
u_int16_t af;
u_int8_t safi, snpa;
union { /* copy buffer for bandwidth values */
float f;
u_int32_t i;
} bw;
int advance;
int tlen;
const u_char *tptr;
char buf[MAXHOSTNAMELEN + 100];
tptr = pptr;
tlen=len;
switch (attr->bgpa_type) {
case BGPTYPE_ORIGIN:
if (len != 1)
printf("invalid len");
else
printf("%s", tok2str(bgp_origin_values, "Unknown Origin Typecode", tptr[0]));
break;
case BGPTYPE_AS_PATH:
if (len % 2) {
printf("invalid len");
break;
}
if (!len) {
printf("empty");
break;
}
while (tptr < pptr + len) {
printf("%s", tok2str(bgp_as_path_segment_open_values, "?", tptr[0]));
for (i = 0; i < tptr[1] * 2; i += 2) {
printf("%u ", EXTRACT_16BITS(&tptr[2 + i]));
}
printf("%s", tok2str(bgp_as_path_segment_close_values, "?", tptr[0]));
tptr += 2 + tptr[1] * 2;
}
break;
case BGPTYPE_NEXT_HOP:
if (len != 4)
printf("invalid len");
else
printf("%s", getname(tptr));
break;
case BGPTYPE_MULTI_EXIT_DISC:
case BGPTYPE_LOCAL_PREF:
if (len != 4)
printf("invalid len");
else
printf("%u", EXTRACT_32BITS(tptr));
break;
case BGPTYPE_ATOMIC_AGGREGATE:
if (len != 0)
printf("invalid len");
break;
case BGPTYPE_AGGREGATOR:
if (len != 6) {
printf("invalid len");
break;
}
printf(" AS #%u, origin %s", EXTRACT_16BITS(tptr),
getname(tptr + 2));
break;
case BGPTYPE_COMMUNITIES:
if (len % 4) {
printf("invalid len");
break;
}
while (tlen>0) {
u_int32_t comm;
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;
}
printf("%s",getname(tptr));
break;
case BGPTYPE_CLUSTER_LIST:
while (tlen>0) {
printf("%s%s",
getname(tptr),
(tlen>4) ? ", " : "");
tlen -=4;
tptr +=4;
}
break;
case BGPTYPE_MP_REACH_NLRI:
af = EXTRACT_16BITS(tptr);
safi = tptr[2];
printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
tok2str(bgp_afi_values, "Unknown AFI", af),
af,
(safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
tok2str(bgp_safi_values, "Unknown SAFI", safi),
safi);
if (af == AFNUM_INET || af==AFNUM_L2VPN)
;
#ifdef INET6
else if (af == AFNUM_INET6)
;
#endif
else {
printf("\n\t no AFI %u decoder",af);
if (vflag <= 1)
print_unknown_data(tptr,"\n\t ",tlen);
break;
}
tptr +=3;
tlen = tptr[0];
tptr++;
if (tlen) {
printf("\n\t nexthop: ");
while (tlen > 0) {
switch (af) {
case AFNUM_INET:
switch(safi) {
case SAFNUM_UNICAST:
case SAFNUM_MULTICAST:
case SAFNUM_UNIMULTICAST:
case SAFNUM_LABUNICAST:
case SAFNUM_RT_ROUTING_INFO:
printf("%s",getname(tptr));
tlen -= sizeof(struct in_addr);
tptr += sizeof(struct in_addr);
break;
case SAFNUM_VPNUNICAST:
case SAFNUM_VPNMULTICAST:
case SAFNUM_VPNUNIMULTICAST:
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;
default:
printf("no SAFI %u decoder",safi);
if (vflag <= 1)
print_unknown_data(tptr,"\n\t ",tlen);
break;
}
break;
#ifdef INET6
case AFNUM_INET6:
switch(safi) {
case SAFNUM_UNICAST:
case SAFNUM_MULTICAST:
case SAFNUM_UNIMULTICAST:
case SAFNUM_LABUNICAST:
case SAFNUM_RT_ROUTING_INFO:
printf("%s", getname6(tptr));
tlen -= sizeof(struct in6_addr);
tptr += sizeof(struct in6_addr);
break;
case SAFNUM_VPNUNICAST:
case SAFNUM_VPNMULTICAST:
case SAFNUM_VPNUNIMULTICAST:
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;
default:
printf("no SAFI %u decoder",safi);
if (vflag <= 1)
print_unknown_data(tptr,"\n\t ",tlen);
break;
}
break;
#endif
case AFNUM_L2VPN:
switch(safi) {
case SAFNUM_VPNUNICAST:
case SAFNUM_VPNMULTICAST:
case SAFNUM_VPNUNIMULTICAST:
printf("%s", getname(tptr));
tlen -= (sizeof(struct in_addr));
tptr += (sizeof(struct in_addr));
break;
default:
printf("no SAFI %u decoder",safi);
if (vflag <= 1)
print_unknown_data(tptr,"\n\t ",tlen);
break;
}
break;
default:
printf("no AFI %u decoder",af);
if (vflag <= 1)
print_unknown_data(tptr,"\n\t ",tlen);
break;
}
}
}
tptr += tlen;
snpa = tptr[0];
tptr++;
if (snpa) {
printf("\n\t %u SNPA", snpa);
for (/*nothing*/; snpa > 0; snpa--) {
printf("\n\t %d bytes", tptr[0]);
tptr += tptr[0] + 1;
}
} else {
printf(", no SNPA");
}
while (len - (tptr - pptr) > 0) {
switch (af) {
case AFNUM_INET:
switch (safi) {
case SAFNUM_UNICAST:
case SAFNUM_MULTICAST:
case SAFNUM_UNIMULTICAST:
advance = decode_prefix4(tptr, buf, sizeof(buf));
if (advance >= 0)
printf("\n\t %s", buf);
else
printf("\n\t (illegal prefix length)");
break;
case SAFNUM_LABUNICAST:
advance = decode_labeled_prefix4(tptr, buf, sizeof(buf));
printf("\n\t %s", buf);
break;
case SAFNUM_VPNUNICAST:
case SAFNUM_VPNMULTICAST:
case SAFNUM_VPNUNIMULTICAST:
advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf));
printf("\n\t %s", buf);
break;
case SAFNUM_RT_ROUTING_INFO:
advance = decode_rt_routing_info(tptr, buf, sizeof(buf));
printf("\n\t %s", buf);
break;
default:
printf("\n\t no SAFI %u decoder",safi);
if (vflag <= 1)
print_unknown_data(tptr-3,"\n\t ",tlen);
advance = 0;
tptr = pptr + len;
break;
}
break;
#ifdef INET6
case AFNUM_INET6:
switch (safi) {
case SAFNUM_UNICAST:
case SAFNUM_MULTICAST:
case SAFNUM_UNIMULTICAST:
advance = decode_prefix6(tptr, buf, sizeof(buf));
printf("\n\t %s", buf);
break;
case SAFNUM_LABUNICAST:
advance = decode_labeled_prefix6(tptr, buf, sizeof(buf));
printf("\n\t %s", buf);
break;
case SAFNUM_VPNUNICAST:
case SAFNUM_VPNMULTICAST:
case SAFNUM_VPNUNIMULTICAST:
advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf));
printf("\n\t %s", buf);
break;
case SAFNUM_RT_ROUTING_INFO:
advance = decode_rt_routing_info(tptr, buf, sizeof(buf));
printf("\n\t %s", buf);
break;
default:
printf("\n\t no SAFI %u decoder ",safi);
if (vflag <= 1)
print_unknown_data(tptr-3,"\n\t ",tlen);
advance = 0;
tptr = pptr + len;
break;
}
break;
#endif
case AFNUM_L2VPN:
switch(safi) {
case SAFNUM_VPNUNICAST:
case SAFNUM_VPNMULTICAST:
case SAFNUM_VPNUNIMULTICAST:
advance = decode_labeled_vpn_l2(tptr, buf, sizeof(buf));
printf("\n\t %s", buf);
break;
default:
printf("no SAFI %u decoder",safi);
if (vflag <= 1)
print_unknown_data(tptr,"\n\t ",tlen);
advance = 0;
tptr = pptr + len;
break;
}
break;
default:
printf("\n\t no AFI %u decoder ",af);
if (vflag <= 1)
print_unknown_data(tptr-3,"\n\t ",tlen);
advance = 0;
tptr = pptr + len;
break;
}
tptr += advance;
}
break;
case BGPTYPE_MP_UNREACH_NLRI:
af = EXTRACT_16BITS(tptr);
safi = tptr[2];
printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
tok2str(bgp_afi_values, "Unknown AFI", af),
af,
(safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
tok2str(bgp_safi_values, "Unknown SAFI", safi),
safi);
tptr += 3;
while (len - (tptr - pptr) > 0) {
switch (af) {
case AFNUM_INET:
switch (safi) {
case SAFNUM_UNICAST:
case SAFNUM_MULTICAST:
case SAFNUM_UNIMULTICAST:
advance = decode_prefix4(tptr, buf, sizeof(buf));
if (advance >= 0)
printf("\n\t %s", buf);
else
printf("\n\t (illegal prefix length)");
break;
case SAFNUM_LABUNICAST:
advance = decode_labeled_prefix4(tptr, buf, sizeof(buf));
printf("\n\t %s", buf);
break;
case SAFNUM_VPNUNICAST:
case SAFNUM_VPNMULTICAST:
case SAFNUM_VPNUNIMULTICAST:
advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf));
printf("\n\t %s", buf);
break;
default:
printf("\n\t no SAFI %u decoder",safi);
if (vflag <= 1)
print_unknown_data(tptr-3,"\n\t ",tlen);
advance = 0;
tptr = pptr + len;
break;
}
break;
#ifdef INET6
case AFNUM_INET6:
switch (safi) {
case SAFNUM_UNICAST:
case SAFNUM_MULTICAST:
case SAFNUM_UNIMULTICAST:
advance = decode_prefix6(tptr, buf, sizeof(buf));
printf("\n\t %s", buf);
break;
case SAFNUM_LABUNICAST:
advance = decode_labeled_prefix6(tptr, buf, sizeof(buf));
printf("\n\t %s", buf);
break;
case SAFNUM_VPNUNICAST:
case SAFNUM_VPNMULTICAST:
case SAFNUM_VPNUNIMULTICAST:
advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf));
printf("\n\t %s", buf);
break;
default:
printf("\n\t no SAFI %u decoder",safi);
if (vflag <= 1)
print_unknown_data(tptr-3,"\n\t ",tlen);
advance = 0;
tptr = pptr + len;
break;
}
break;
#endif
case AFNUM_L2VPN:
switch(safi) {
case SAFNUM_VPNUNICAST:
case SAFNUM_VPNMULTICAST:
case SAFNUM_VPNUNIMULTICAST:
advance = decode_labeled_vpn_l2(tptr, buf, sizeof(buf));
printf("\n\t %s", buf);
break;
default:
printf("no SAFI %u decoder",safi);
if (vflag <= 1)
print_unknown_data(tptr-3,"\n\t ",tlen);
advance = 0;
tptr = pptr + len;
break;
}
break;
default:
printf("\n\t no AFI %u decoder",af);
if (vflag <= 1)
print_unknown_data(tptr-3,"\n\t ",tlen);
advance = 0;
tptr = pptr + len;
break;
}
tptr += advance;
}
break;
case BGPTYPE_EXTD_COMMUNITIES:
if (len % 8) {
printf("invalid len");
break;
}
while (tlen>0) {
u_int16_t extd_comm;
extd_comm=EXTRACT_16BITS(tptr);
printf("\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));
switch(extd_comm) {
case BGP_EXT_COM_RT_0:
case BGP_EXT_COM_RO_0:
printf(": %u:%s",
EXTRACT_16BITS(tptr+2),
getname(tptr+4));
break;
case BGP_EXT_COM_RT_1:
case BGP_EXT_COM_RO_1:
printf(": %s:%u",
getname(tptr+2),
EXTRACT_16BITS(tptr+6));
break;
case BGP_EXT_COM_RT_2:
case BGP_EXT_COM_RO_2:
printf(": %u:%u",
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_CISCO_MCAST:
printf(": AS %u, group %s",
EXTRACT_16BITS(tptr+2),
getname(tptr+4));
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),
tok2str(bgp_extd_comm_ospf_rtype_values,
"unknown (0x%02x)",
*(tptr+6)),
(*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
(*(tptr+6) == (BGP_OSPF_RTYPE_EXT ||BGP_OSPF_RTYPE_NSSA )) ? "E1" : "");
break;
case BGP_EXT_COM_L2INFO:
printf(": %s Control Flags [0x%02x]:MTU %u",
tok2str(bgp_l2vpn_encaps_values,
"unknown encaps",
*(tptr+2)),
*(tptr+3),
EXTRACT_16BITS(tptr+4));
break;
default:
print_unknown_data(tptr,"\n\t ",8);
break;
}
tlen -=8;
tptr +=8;
}
break;
case BGPTYPE_ATTR_SET:
printf("\n\t Origin AS: %u", EXTRACT_32BITS(tptr));
tptr+=4;
len -=4;
while (len >= 2 ) {
int alen;
struct bgp_attr bgpa;
memcpy(&bgpa, tptr, sizeof(bgpa));
alen = bgp_attr_len(&bgpa);
tptr += bgp_attr_off(&bgpa);
len -= bgp_attr_off(&bgpa);
printf("\n\t %s (%u), length: %u",
tok2str(bgp_attr_values, "Unknown Attribute", bgpa.bgpa_type),
bgpa.bgpa_type,
alen);
if (bgpa.bgpa_flags) {
printf(", Flags [%s%s%s%s",
bgpa.bgpa_flags & 0x80 ? "O" : "",
bgpa.bgpa_flags & 0x40 ? "T" : "",
bgpa.bgpa_flags & 0x20 ? "P" : "",
bgpa.bgpa_flags & 0x10 ? "E" : "");
if (bgpa.bgpa_flags & 0xf)
printf("+%x", bgpa.bgpa_flags & 0xf);
printf("]: ");
}
bgp_attr_print(&bgpa, tptr, alen); /* FIXME check for recursion */
tptr += alen;
len -= alen;
}
break;
default:
printf("\n\t no Attribute %u decoder",attr->bgpa_type); /* 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*/
print_unknown_data(pptr,"\n\t ",len);
}
static void
bgp_open_print(const u_char *dat, int length)
{
struct bgp_open bgpo;
struct bgp_opt bgpopt;
int hlen;
const u_char *opt;
int i,cap_type,cap_len,tcap_len,cap_offset;
TCHECK2(dat[0], BGP_OPEN_SIZE);
memcpy(&bgpo, dat, BGP_OPEN_SIZE);
hlen = ntohs(bgpo.bgpo_len);
printf("\n\t Version %d, ", bgpo.bgpo_version);
printf("my AS %u, ", 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",
tok2str(bgp_opt_values,"Unknown", bgpopt.bgpopt_type),
bgpopt.bgpopt_type,
bgpopt.bgpopt_len);
/* now lets decode the options we know*/
switch(bgpopt.bgpopt_type) {
case BGP_OPT_CAP:
cap_type=opt[i+BGP_OPT_SIZE];
cap_len=opt[i+BGP_OPT_SIZE+1];
tcap_len=cap_len;
printf("\n\t %s, length: %u",
tok2str(bgp_capcode_values,"Unknown", cap_type),
cap_len);
switch(cap_type) {
case BGP_CAPCODE_MP:
printf("\n\t\tAFI %s (%u), SAFI %s (%u)",
tok2str(bgp_afi_values,"Unknown", EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2)),
EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2),
tok2str(bgp_safi_values,"Unknown", opt[i+BGP_OPT_SIZE+5]),
opt[i+BGP_OPT_SIZE+5]);
break;
case BGP_CAPCODE_RESTART:
printf("\n\t\tRestart Flags: [%s], Restart Time %us",
((opt[i+BGP_OPT_SIZE+2])&0x80) ? "R" : "none",
EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+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",
tok2str(bgp_afi_values,"Unknown", EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+cap_offset)),
EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+cap_offset),
tok2str(bgp_safi_values,"Unknown", opt[i+BGP_OPT_SIZE+cap_offset+2]),
opt[i+BGP_OPT_SIZE+cap_offset+2],
((opt[i+BGP_OPT_SIZE+cap_offset+3])&0x80) ? "yes" : "no" );
tcap_len-=4;
cap_offset+=4;
}
break;
case BGP_CAPCODE_RR:
case BGP_CAPCODE_RR_CISCO:
break;
default:
printf("\n\t\tno decoder for Capability %u",
cap_type);
if (vflag <= 1)
print_unknown_data(&opt[i+BGP_OPT_SIZE+2],"\n\t\t",cap_len);
break;
}
if (vflag > 1)
print_unknown_data(&opt[i+BGP_OPT_SIZE+2],"\n\t\t",cap_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;
struct bgp_attr bgpa;
int hlen;
const u_char *p;
int len;
int i;
TCHECK2(dat[0], BGP_SIZE);
memcpy(&bgp, dat, BGP_SIZE);
hlen = ntohs(bgp.bgp_len);
p = dat + BGP_SIZE; /*XXX*/
/* Unfeasible routes */
len = EXTRACT_16BITS(p);
if (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.
*/
#ifdef INET6
printf("\n\t Withdrawn routes: %d bytes", len);
#else
char buf[MAXHOSTNAMELEN + 100];
int wpfx;
TCHECK2(p[2], len);
i = 2;
printf("\n\t Withdrawn routes:");
while(i < 2 + len) {
wpfx = decode_prefix4(&p[i], buf, sizeof(buf));
if (wpfx >= 0) {
i += wpfx;
printf("\n\t %s", buf);
} else {
printf("\n\t (illegal prefix length)");
break;
}
}
#endif
}
p += 2 + len;
TCHECK2(p[0], 2);
len = EXTRACT_16BITS(p);
if (len) {
/* do something more useful!*/
i = 2;
while (i < 2 + len) {
int alen, aoff;
TCHECK2(p[i], sizeof(bgpa));
memcpy(&bgpa, &p[i], sizeof(bgpa));
alen = bgp_attr_len(&bgpa);
aoff = bgp_attr_off(&bgpa);
printf("\n\t %s (%u), length: %u",
tok2str(bgp_attr_values, "Unknown Attribute", bgpa.bgpa_type),
bgpa.bgpa_type,
alen);
if (bgpa.bgpa_flags) {
printf(", Flags [%s%s%s%s",
bgpa.bgpa_flags & 0x80 ? "O" : "",
bgpa.bgpa_flags & 0x40 ? "T" : "",
bgpa.bgpa_flags & 0x20 ? "P" : "",
bgpa.bgpa_flags & 0x10 ? "E" : "");
if (bgpa.bgpa_flags & 0xf)
printf("+%x", bgpa.bgpa_flags & 0xf);
printf("]: ");
}
bgp_attr_print(&bgpa, &p[i + aoff], alen);
i += aoff + alen;
}
}
p += 2 + len;
if (dat + length > p) {
printf("\n\t Updated routes:");
while (dat + length > p) {
char buf[MAXHOSTNAMELEN + 100];
i = decode_prefix4(p, buf, sizeof(buf));
if (i >= 0) {
printf("\n\t %s", buf);
p += i;
} else {
printf("\n\t (illegal prefix length)");
break;
}
}
}
return;
trunc:
printf("[|BGP]");
}
static void
bgp_notification_print(const u_char *dat, int length)
{
struct bgp_notification bgpn;
int hlen;
const u_char *tptr;
TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
hlen = ntohs(bgpn.bgpn_len);
/* some little sanity checking */
if (length<BGP_NOTIFICATION_SIZE)
return;
printf(", %s (%u)",
tok2str(bgp_notify_major_values, "Unknown Error", bgpn.bgpn_major),
bgpn.bgpn_major);
switch (bgpn.bgpn_major) {
case BGP_NOTIFY_MAJOR_MSG:
printf(", subcode %s (%u)",
tok2str(bgp_notify_minor_msg_values, "Unknown", bgpn.bgpn_minor),
bgpn.bgpn_minor);
break;
case BGP_NOTIFY_MAJOR_OPEN:
printf(", subcode %s (%u)",
tok2str(bgp_notify_minor_open_values, "Unknown", bgpn.bgpn_minor),
bgpn.bgpn_minor);
break;
case BGP_NOTIFY_MAJOR_UPDATE:
printf(", subcode %s (%u)",
tok2str(bgp_notify_minor_update_values, "Unknown", bgpn.bgpn_minor),
bgpn.bgpn_minor);
break;
case BGP_NOTIFY_MAJOR_CAP:
printf(" subcode %s (%u)",
tok2str(bgp_notify_minor_cap_values, "Unknown", bgpn.bgpn_minor),
bgpn.bgpn_minor);
case BGP_NOTIFY_MAJOR_CEASE:
printf(", subcode %s (%u)",
tok2str(bgp_notify_minor_cease_values, "Unknown", bgpn.bgpn_minor),
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",
tok2str(bgp_afi_values, "Unknown", EXTRACT_16BITS(tptr)),
EXTRACT_16BITS(tptr),
tok2str(bgp_safi_values, "Unknown", *(tptr+2)),
*(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;
bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
printf("\n\t AFI %s (%u), SAFI %s (%u)",
tok2str(bgp_afi_values,"Unknown",
EXTRACT_16BITS(&bgp_route_refresh_header->afi)), /* this stinks but the compiler pads the structure weird */
EXTRACT_16BITS(&bgp_route_refresh_header->afi),
tok2str(bgp_safi_values,"Unknown",
bgp_route_refresh_header->safi),
bgp_route_refresh_header->safi);
if (vflag > 1)
print_unknown_data(pptr,"\n\t ", len);
return;
}
static void
bgp_header_print(const u_char *dat, int length)
{
struct bgp bgp;
TCHECK2(dat[0], BGP_SIZE);
memcpy(&bgp, dat, BGP_SIZE);
printf("\n\t%s Message (%u), length: %u",
tok2str(bgp_msg_values, "Unknown", bgp.bgp_type),
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 */
printf("\n\t no Message %u decoder",bgp.bgp_type);
print_unknown_data(dat,"\n\t ",length);
break;
}
return;
trunc:
printf("[|BGP]");
}
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;
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 < snapend) {
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)) {
bgp_header_print(p, hlen);
p += hlen;
start = p;
} else {
printf("\n[|BGP %s]", tok2str(bgp_msg_values, "Unknown Message Type",bgp.bgp_type));
break;
}
}
return;
trunc:
printf(" [|BGP]");
}
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