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android / platform / external / tcpdump / 8633096f / . / print-bgp.c
blob: 1905bdb9ec0f53f6adccec9e71939e727948df38 [file] [log] [blame]
/*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-bgp.c,v 1.43 2002-07-24 21:07:20 hannes Exp $";
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <netdb.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;
/* data should follow */
};
#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) ? \
ntohs((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 */
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"},
{ 255, "Reserved for development"},
{ 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_RR_CISCO 128
static struct tok bgp_capcode_values[] = {
{ BGP_CAPCODE_MP, "Multiprotocol Extensions"},
{ BGP_CAPCODE_RR, "Route Refresh"},
{ 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
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"},
{ 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_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
#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"},
{ 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},
};
static struct tok bgp_extd_comm_subtype_values[] = {
{ 2, "target"},
{ 3, "origin"},
{ 4, "link-BW"},
{ 10, "layer2-info"},
{ 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 (plen < 0 || 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 (plen < 0 || 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;
}
static u_char *
bgp_vpn_rd_print (const u_char *pptr) {
/* allocate space for the following string
* xxx.xxx.xxx.xxx:xxxxx
* 21 bytes plus one termination byte */
static char rd[22];
char *pos = rd;
/* ok lets load the RD format */
switch (EXTRACT_16BITS(pptr)) {
/* AS:IP-address fmt*/
case 0:
pos+=sprintf(pos, "%u:%u.%u.%u.%u",
EXTRACT_16BITS(pptr+2),
*(pptr+4),
*(pptr+5),
*(pptr+6),
*(pptr+7));
break;
/* IP-address:AS fmt*/
case 1:
pos+=sprintf(pos, "%u.%u.%u.%u:%u",
*(pptr+2),
*(pptr+3),
*(pptr+4),
*(pptr+5),
EXTRACT_16BITS(pptr+6));
break;
default:
pos+=sprintf(pos, "unknown RD format");
break;
}
*(pos) = '\0';
return (rd);
}
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 (plen < 0 || 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 (plen < 0 || 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;
}
#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;
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) {
/*
* under RFC1965, p[0] means:
* 1: AS_SET 2: AS_SEQUENCE
* 3: AS_CONFED_SET 4: AS_CONFED_SEQUENCE
*/
if (tptr[0] == 3 || tptr[0] == 4)
printf("confed");
printf("%s", (tptr[0] & 1) ? "{" : "");
for (i = 0; i < tptr[1] * 2; i += 2) {
printf("%s%u", i == 0 ? "" : " ",
EXTRACT_16BITS(&tptr[2 + i]));
}
printf("%s", (tptr[0] & 1) ? "}" : "");
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)
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:
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)
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:
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)
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)
print_unknown_data(tptr,"\n\t ",tlen);
break;
}
break;
default:
printf("no AFI %u decoder",af);
if (!vflag)
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));
printf("\n\t %s", buf);
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)
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;
default:
printf("\n\t no SAFI %u decoder ",safi);
if (!vflag)
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)
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)
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));
printf("\n\t %s", buf);
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)
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;
default:
printf("\n\t no SAFI %u decoder",safi);
if (!vflag)
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)
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)
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_int8_t extd_comm,extd_comm_type,extd_comm_subtype;
extd_comm=*tptr;
extd_comm_type=extd_comm&0x3f;
extd_comm_subtype=*(tptr+1);
switch(extd_comm_type) {
case 0:
switch (extd_comm_subtype) {
case 2:
case 3:
case 4:
printf("\n\t %s%s%s:%u:%s",
(extd_comm&0x80) ? "vendor-specific: " : "",
(extd_comm&0x40) ? "non-transitive: " : "",
tok2str(bgp_extd_comm_subtype_values,
"unknown",
extd_comm_subtype&0x3f),
EXTRACT_16BITS(tptr+2),
getname(tptr+4));
break;
/* juniper has allocated typecode 10 to convey l2 information */
case 10:
printf("\n\t %s%s:%s:Control Flags [0x%02x]:MTU %u",
(extd_comm&0x40) ? "non-transitive: " : "",
tok2str(bgp_extd_comm_subtype_values,
"unknown",
extd_comm_subtype&0x3f),
tok2str(bgp_l2vpn_encaps_values,
"unknown encaps",
*(tptr+2)),
*(tptr+3),
EXTRACT_16BITS(tptr+4));
break;
}
break;
case 1:
printf("\n\t %s%s%s:%s:%u",
(extd_comm&0x80) ? "vendor-specific: " : "",
(extd_comm&0x40) ? "non-transitive: " : "",
tok2str(bgp_extd_comm_subtype_values,
"unknown",
extd_comm_subtype&0x3f),
getname(tptr+2),
EXTRACT_16BITS(tptr+6));
break;
case 2:
printf("\n\t %s%s%s:%u:%u",
(extd_comm&0x80) ? "vendor-specific: " : "",
(extd_comm&0x40) ? "non-transitive: " : "",
tok2str(bgp_extd_comm_subtype_values,
"unknown",
extd_comm_subtype&0x3f),
EXTRACT_32BITS(tptr+2),
EXTRACT_16BITS(tptr+6));
break;
default:
printf("\n\t no typecode %u decoder",
extd_comm_type);
print_unknown_data(tptr,"\n\t ",8);
break;
}
tlen -=8;
tptr +=8;
}
break;
default:
printf("\n\t no Attribute %u decoder",attr->bgpa_type); /* we have no decoder for the attribute */
if (!vflag)
print_unknown_data(pptr,"\n\t ",len);
break;
}
if (vflag&&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;
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);
/* 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];
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_RR:
case BGP_CAPCODE_RR_CISCO:
break;
default:
printf("\n\t\tno decoder for Capability %u",
cap_type);
break;
}
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];
TCHECK2(p[2], len);
i = 2;
printf("\n\t Withdrawn routes:");
while(i < 2 + len) {
i += decode_prefix4(&p[i], buf, sizeof(buf));
printf("\n\t %s", buf);
}
#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));
printf("\n\t %s", buf);
if (i < 0)
break;
p += i;
}
}
return;
trunc:
printf("[|BGP]");
}
static void
bgp_notification_print(const u_char *dat, int length)
{
struct bgp_notification bgpn;
int hlen;
TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
hlen = ntohs(bgpn.bgpn_len);
printf(", Error - %s", tok2str(bgp_notify_major_values, "Unknown", bgpn.bgpn_major));
switch (bgpn.bgpn_major) {
case BGP_NOTIFY_MAJOR_MSG:
printf(" subcode %s", tok2str(bgp_notify_minor_msg_values, "Unknown", bgpn.bgpn_minor));
break;
case BGP_NOTIFY_MAJOR_OPEN:
printf(" subcode %s", tok2str(bgp_notify_minor_open_values, "Unknown", bgpn.bgpn_minor));
break;
case BGP_NOTIFY_MAJOR_UPDATE:
printf(" subcode %s", tok2str(bgp_notify_minor_update_values, "Unknown", bgpn.bgpn_minor));
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)
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");
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 (TTEST2(p[0], hlen)) {
bgp_header_print(p, hlen);
p += hlen;
start = p;
} else {
printf("[|BGP %s]", tok2str(bgp_msg_values, "Unknown Message Type",bgp.bgp_type));
break;
}
}
return;
trunc:
printf(" [|BGP]");
}