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print-bgp.c
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print-bgp.c
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/*
* Copyright (C) 1999 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Extensively modified by Hannes Gredler (hannes@juniper.net) for more
* complete BGP support.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
#include "af.h"
#include "l2vpn.h"
struct bgp {
uint8_t bgp_marker[16];
uint16_t bgp_len;
uint8_t bgp_type;
};
#define BGP_SIZE 19 /* unaligned */
#define BGP_OPEN 1
#define BGP_UPDATE 2
#define BGP_NOTIFICATION 3
#define BGP_KEEPALIVE 4
#define BGP_ROUTE_REFRESH 5
static const struct tok bgp_msg_values[] = {
{ BGP_OPEN, "Open"},
{ BGP_UPDATE, "Update"},
{ BGP_NOTIFICATION, "Notification"},
{ BGP_KEEPALIVE, "Keepalive"},
{ BGP_ROUTE_REFRESH, "Route Refresh"},
{ 0, NULL}
};
struct bgp_open {
uint8_t bgpo_marker[16];
uint16_t bgpo_len;
uint8_t bgpo_type;
uint8_t bgpo_version;
uint16_t bgpo_myas;
uint16_t bgpo_holdtime;
uint32_t bgpo_id;
uint8_t bgpo_optlen;
/* options should follow */
};
#define BGP_OPEN_SIZE 29 /* unaligned */
struct bgp_opt {
uint8_t bgpopt_type;
uint8_t bgpopt_len;
/* variable length */
};
#define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
#define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
struct bgp_notification {
uint8_t bgpn_marker[16];
uint16_t bgpn_len;
uint8_t bgpn_type;
uint8_t bgpn_major;
uint8_t bgpn_minor;
};
#define BGP_NOTIFICATION_SIZE 21 /* unaligned */
struct bgp_route_refresh {
uint8_t bgp_marker[16];
uint16_t len;
uint8_t type;
uint8_t afi[2]; /* the compiler messes this structure up */
uint8_t res; /* when doing misaligned sequences of int8 and int16 */
uint8_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.
*
* Depending on bflag is set or not, AS number is converted into ASDOT notation
* or plain number notation.
*
*/
static char *
as_printf(netdissect_options *ndo,
char *str, int size, u_int asnum)
{
if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
snprintf(str, size, "%u", asnum);
} else {
snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
}
return str;
}
#define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
int
decode_prefix4(netdissect_options *ndo,
const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
{
struct in_addr addr;
u_int plen, plenbytes;
ND_TCHECK(pptr[0]);
ITEMCHECK(1);
plen = pptr[0];
if (32 < plen)
return -1;
itemlen -= 1;
memset(&addr, 0, sizeof(addr));
plenbytes = (plen + 7) / 8;
ND_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(ndo, (u_char *)&addr), plen);
return 1 + plenbytes;
trunc:
return -2;
badtlv:
return -3;
}
static int
decode_labeled_prefix4(netdissect_options *ndo,
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 */
ND_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 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;
ND_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(ndo, (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(netdissect_options *ndo,
const u_char *pptr, u_int addr_length)
{
/* worst case string is s fully formatted v6 address */
static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
char *pos = addr;
switch(addr_length) {
case (sizeof(struct in_addr) << 3): /* 32 */
ND_TCHECK2(pptr[0], sizeof(struct in_addr));
snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
break;
#ifdef INET6
case (sizeof(struct in6_addr) << 3): /* 128 */
ND_TCHECK2(pptr[0], sizeof(struct in6_addr));
snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, 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(netdissect_options *ndo,
const u_char *pptr, char *buf, u_int buflen)
{
uint8_t addr_length;
u_int total_length, offset;
total_length = 0;
/* Source address length, encoded in bits */
ND_TCHECK2(pptr[0], 1);
addr_length = *pptr++;
/* Source address */
ND_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(ndo, pptr, addr_length));
pptr += (addr_length >> 3);
}
/* Group address length, encoded in bits */
ND_TCHECK2(pptr[0], 1);
addr_length = *pptr++;
/* Group address */
ND_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(ndo, 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(netdissect_options *ndo,
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(ndo, 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(netdissect_options *ndo,
const u_char *pptr, char *buf, u_int buflen)
{
uint8_t route_target[8];
u_int plen;
ND_TCHECK(pptr[0]);
plen = pptr[0]; /* get prefix length */
if (0 == plen) {
snprintf(buf, buflen, "default route target");
return 1;
}
if (32 > plen)
return -1;
plen-=32; /* adjust prefix length */
if (64 < plen)
return -1;
memset(&route_target, 0, sizeof(route_target));
ND_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(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+1)),
bgp_vpn_rd_print(ndo, (u_char *)&route_target));
return 5 + (plen + 7) / 8;
trunc:
return -2;
}
static int
decode_labeled_vpn_prefix4(netdissect_options *ndo,
const u_char *pptr, char *buf, u_int buflen)
{
struct in_addr addr;
u_int plen;
ND_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));
ND_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(ndo, pptr+4),
getname(ndo, (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(netdissect_options *ndo,
const u_char *pptr, char *buf, u_int buflen)
{
const u_char *rd;
const u_char *vpn_ip;
ND_TCHECK(pptr[0]);
/* if the NLRI is not predefined length, quit.*/
if (*pptr != MDT_VPN_NLRI_LEN * 8)
return -1;
pptr++;
/* RD */
ND_TCHECK2(pptr[0], 8);
rd = pptr;
pptr+=8;
/* IPv4 address */
ND_TCHECK2(pptr[0], sizeof(struct in_addr));
vpn_ip = pptr;
pptr+=sizeof(struct in_addr);
/* MDT Group Address */
ND_TCHECK2(pptr[0], sizeof(struct in_addr));
snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, 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(netdissect_options *ndo,
const u_char *pptr, char *buf, u_int buflen)
{
uint8_t route_type, route_length, addr_length, sg_length;
u_int offset;
ND_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:
ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
offset = strlen(buf);
snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
bgp_vpn_rd_print(ndo, pptr),
bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
(route_length - BGP_VPN_RD_LEN) << 3));
break;
case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
ND_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(ndo, pptr),
as_printf(ndo, astostr, sizeof(astostr),
EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
break;
case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
offset = strlen(buf);
snprintf(buf + offset, buflen - offset, ", RD: %s",
bgp_vpn_rd_print(ndo, pptr));
pptr += BGP_VPN_RD_LEN;
sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
addr_length = route_length - sg_length;
ND_TCHECK2(pptr[0], addr_length);
offset = strlen(buf);
snprintf(buf + offset, buflen - offset, ", Originator %s",
bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
break;
case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
offset = strlen(buf);
snprintf(buf + offset, buflen - offset, ", RD: %s",
bgp_vpn_rd_print(ndo, pptr));
pptr += BGP_VPN_RD_LEN;
bgp_vpn_sg_print(ndo, pptr, buf, buflen);
break;
case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
offset = strlen(buf);
snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
bgp_vpn_rd_print(ndo, pptr),
as_printf(ndo, astostr, sizeof(astostr),
EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
pptr += BGP_VPN_RD_LEN;
bgp_vpn_sg_print(ndo, pptr, buf, buflen);
break;
/*
* no per route-type printing yet.
*/
case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
default:
break;
}
return route_length + 2;
trunc:
return -2;
}
/*
* As I remember, some versions of systems have an snprintf() that
* returns -1 if the buffer would have overflowed. If the return
* value is negative, set buflen to 0, to indicate that we've filled
* the buffer up.
*
* If the return value is greater than buflen, that means that
* the buffer would have overflowed; again, set buflen to 0 in
* that case.
*/
#define UPDATE_BUF_BUFLEN(buf, buflen, 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(netdissect_options *ndo,
const u_char *pptr, char *buf, u_int buflen)
{
int plen,tlen,strlen,tlv_type,tlv_len,ttlv_len;
ND_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 */
ND_TCHECK2(pptr[0],12);
buf[0]='\0';
strlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s",
bgp_vpn_rd_print(ndo, pptr),
/* need something like getname(ndo, ) here */
getname(ndo, 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 */
ND_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(ndo, 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 */