/* $NetBSD: print-bgp.c,v 1.5 2004/09/27 23:04:24 dyoung Exp $ */ /* * 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 #ifndef lint #if 0 static const char rcsid[] _U_ = "@(#) Header: /tcpdump/master/tcpdump/print-bgp.c,v 1.72.2.4 2004/03/24 00:04:04 guy Exp"; #else __RCSID("$NetBSD: print-bgp.c,v 1.5 2004/09/27 23:04:24 dyoung Exp $"); #endif #endif #include #include #include #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 */ 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_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"}, { 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_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_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; TCHECK(pptr[0]); plen = pptr[0]; if (32 < plen) return -1; memset(&addr, 0, sizeof(addr)); TCHECK2(pptr[1], (plen + 7) / 8); 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; trunc: return -2; } static int decode_labeled_prefix4(const u_char *pptr, char *buf, u_int buflen) { struct in_addr addr; u_int plen; TCHECK(pptr[0]); plen = pptr[0]; /* get prefix length */ /* 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)); TCHECK2(pptr[4], (plen + 7) / 8); 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; trunc: return -2; } /* 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 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: 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", EXTRACT_32BITS(pptr+2), EXTRACT_16BITS(pptr+6)); break; default: snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format"); break; } pos += strlen(pos); *(pos) = '\0'; return (rd); } static int decode_rt_routing_info(const u_char *pptr, char *buf, u_int buflen) { u_int8_t route_target[8]; u_int plen; TCHECK(pptr[0]); plen = pptr[0]; /* get prefix length */ plen-=32; /* adjust prefix length */ if (0 < plen) return -1; memset(&route_target, 0, sizeof(route_target)); TCHECK2(pptr[1], (plen + 7) / 8); memcpy(&route_target, &pptr[1], (plen + 7) / 8); if (plen % 8) { ((u_char *)&route_target)[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff); } snprintf(buf, buflen, "origin AS: %u, route target %s", EXTRACT_32BITS(pptr+1), bgp_vpn_rd_print((u_char *)&route_target)); return 5 + (plen + 7) / 8; trunc: return -2; } static int decode_labeled_vpn_prefix4(const u_char *pptr, char *buf, u_int buflen) { struct in_addr addr; u_int plen; TCHECK(pptr[0]); plen = pptr[0]; /* get prefix length */ plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ if (32 < plen) return -1; memset(&addr, 0, sizeof(addr)); TCHECK2(pptr[12], (plen + 7) / 8); memcpy(&addr, &pptr[12], (plen + 7) / 8); if (plen % 8) { ((u_char *)&addr)[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff); } /* the label may get offsetted by 4 bits so lets shift it right */ snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", bgp_vpn_rd_print(pptr+4), getname((u_char *)&addr), plen, EXTRACT_24BITS(pptr+1)>>4, ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); return 12 + (plen + 7) / 8; trunc: return -2; } static int decode_labeled_vpn_l2(const u_char *pptr, char *buf, u_int buflen) { int plen,tlen,strlen,tlv_type,tlv_len,ttlv_len; TCHECK2(pptr[0], 2); plen=EXTRACT_16BITS(pptr); tlen=plen; pptr+=2; TCHECK2(pptr[0],15); 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) { if (tlen < 3) return -1; TCHECK2(pptr[0], 3); tlv_type=*pptr++; tlv_len=EXTRACT_16BITS(pptr); ttlv_len=tlv_len; pptr+=2; switch(tlv_type) { case 1: 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) { TCHECK(pptr[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; trunc: return -2; } #ifdef INET6 static int decode_prefix6(const u_char *pd, char *buf, u_int buflen) { struct in6_addr addr; u_int plen; TCHECK(pd[0]); plen = pd[0]; if (128 < plen) return -1; memset(&addr, 0, sizeof(addr)); TCHECK2(pd[1], (plen + 7) / 8); 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; trunc: return -2; } static int decode_labeled_prefix6(const u_char *pptr, char *buf, u_int buflen) { struct in6_addr addr; u_int plen; TCHECK(pptr[0]); plen = pptr[0]; /* get prefix length */ plen-=24; /* adjust prefixlen - labellength */ if (128 < plen) return -1; memset(&addr, 0, sizeof(addr)); TCHECK2(pptr[4], (plen + 7) / 8); memcpy(&addr, &pptr[4], (plen + 7) / 8); if (plen % 8) { addr.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; trunc: return -2; } static int decode_labeled_vpn_prefix6(const u_char *pptr, char *buf, u_int buflen) { struct in6_addr addr; u_int plen; TCHECK(pptr[0]); plen = pptr[0]; /* get prefix length */ plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ if (128 < plen) return -1; memset(&addr, 0, sizeof(addr)); TCHECK2(pptr[12], (plen + 7) / 8); memcpy(&addr, &pptr[12], (plen + 7) / 8); if (plen % 8) { addr.s6_addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff); } /* the label may get offsetted by 4 bits so lets shift it right */ snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", bgp_vpn_rd_print(pptr+4), getname6((u_char *)&addr), plen, EXTRACT_24BITS(pptr+1)>>4, ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); return 12 + (plen + 7) / 8; trunc: return -2; } #endif static int 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 { TCHECK(*tptr); 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) { TCHECK(tptr[0]); printf("%s", tok2str(bgp_as_path_segment_open_values, "?", tptr[0])); for (i = 0; i < tptr[1] * 2; i += 2) { TCHECK2(tptr[2 + i], 2); printf("%u ", EXTRACT_16BITS(&tptr[2 + i])); } TCHECK(tptr[0]); printf("%s", tok2str(bgp_as_path_segment_close_values, "?", tptr[0])); TCHECK(tptr[1]); tptr += 2 + tptr[1] * 2; } break; case BGPTYPE_NEXT_HOP: if (len != 4) printf("invalid len"); else { TCHECK2(tptr[0], 4); printf("%s", getname(tptr)); } break; case BGPTYPE_MULTI_EXIT_DISC: case BGPTYPE_LOCAL_PREF: if (len != 4) printf("invalid len"); else { TCHECK2(tptr[0], 4); printf("%u", EXTRACT_32BITS(tptr)); } break; case BGPTYPE_ATOMIC_AGGREGATE: if (len != 0) printf("invalid len"); break; case BGPTYPE_AGGREGATOR: if (len != 6) { printf("invalid len"); break; } TCHECK2(tptr[0], 6); 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; TCHECK2(tptr[0], 4); comm = EXTRACT_32BITS(tptr); switch (comm) { case BGP_COMMUNITY_NO_EXPORT: printf(" NO_EXPORT"); break; case BGP_COMMUNITY_NO_ADVERT: printf(" NO_ADVERTISE"); break; case BGP_COMMUNITY_NO_EXPORT_SUBCONFED: printf(" NO_EXPORT_SUBCONFED"); break; default: printf("%u:%u%s", (comm >> 16) & 0xffff, comm & 0xffff, (tlen>4) ? ", " : ""); break; } tlen -=4; tptr +=4; } break; case BGPTYPE_ORIGINATOR_ID: if (len != 4) { printf("invalid len"); break; } TCHECK2(tptr[0], 4); printf("%s",getname(tptr)); break; case BGPTYPE_CLUSTER_LIST: if (len % 4) { printf("invalid len"); break; } while (tlen>0) { TCHECK2(tptr[0], 4); printf("%s%s", getname(tptr), (tlen>4) ? ", " : ""); tlen -=4; tptr +=4; } break; case BGPTYPE_MP_REACH_NLRI: TCHECK2(tptr[0], 3); af = EXTRACT_16BITS(tptr); safi = tptr[2]; printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)", 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; TCHECK(tptr[0]); 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: if (tlen < (int)sizeof(struct in_addr)) { printf("invalid len"); tlen = 0; } else { TCHECK2(tptr[0], sizeof(struct in_addr)); printf("%s",getname(tptr)); tlen -= sizeof(struct in_addr); tptr += sizeof(struct in_addr); } break; case SAFNUM_VPNUNICAST: case SAFNUM_VPNMULTICAST: case SAFNUM_VPNUNIMULTICAST: if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) { printf("invalid len"); tlen = 0; } else { TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN); printf("RD: %s, %s", bgp_vpn_rd_print(tptr), getname(tptr+BGP_VPN_RD_LEN)); tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN); tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN); } break; default: TCHECK2(tptr[0], tlen); printf("no SAFI %u decoder",safi); if (vflag <= 1) print_unknown_data(tptr,"\n\t ",tlen); tptr += tlen; tlen = 0; 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: if (tlen < (int)sizeof(struct in6_addr)) { printf("invalid len"); tlen = 0; } else { TCHECK2(tptr[0], sizeof(struct in6_addr)); printf("%s", getname6(tptr)); tlen -= sizeof(struct in6_addr); tptr += sizeof(struct in6_addr); } break; case SAFNUM_VPNUNICAST: case SAFNUM_VPNMULTICAST: case SAFNUM_VPNUNIMULTICAST: if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) { printf("invalid len"); tlen = 0; } else { TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN); printf("RD: %s, %s", bgp_vpn_rd_print(tptr), getname6(tptr+BGP_VPN_RD_LEN)); tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); } break; default: TCHECK2(tptr[0], tlen); printf("no SAFI %u decoder",safi); if (vflag <= 1) print_unknown_data(tptr,"\n\t ",tlen); tptr += tlen; tlen = 0; break; } break; #endif case AFNUM_L2VPN: switch(safi) { case SAFNUM_VPNUNICAST: case SAFNUM_VPNMULTICAST: case SAFNUM_VPNUNIMULTICAST: if (tlen < (int)sizeof(struct in_addr)) { printf("invalid len"); tlen = 0; } else { TCHECK2(tptr[0], sizeof(struct in_addr)); printf("%s", getname(tptr)); tlen -= (sizeof(struct in_addr)); tptr += (sizeof(struct in_addr)); } break; default: TCHECK2(tptr[0], tlen); printf("no SAFI %u decoder",safi); if (vflag <= 1) print_unknown_data(tptr,"\n\t ",tlen); tptr += tlen; tlen = 0; break; } break; default: TCHECK2(tptr[0], tlen); printf("no AFI %u decoder",af); if (vflag <= 1) print_unknown_data(tptr,"\n\t ",tlen); tptr += tlen; tlen = 0; break; } } } tptr += tlen; TCHECK(tptr[0]); snpa = tptr[0]; tptr++; if (snpa) { printf("\n\t %u SNPA", snpa); for (/*nothing*/; snpa > 0; snpa--) { TCHECK(tptr[0]); printf("\n\t %d bytes", tptr[0]); tptr += tptr[0] + 1; } } else { printf(", no SNPA"); } while (len - (tptr - pptr) > 0) { switch (af) { case AFNUM_INET: switch (safi) { case SAFNUM_UNICAST: case SAFNUM_MULTICAST: case SAFNUM_UNIMULTICAST: advance = decode_prefix4(tptr, buf, sizeof(buf)); if (advance == -1) printf("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; case SAFNUM_LABUNICAST: advance = decode_labeled_prefix4(tptr, buf, sizeof(buf)); if (advance == -1) printf("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; case SAFNUM_VPNUNICAST: case SAFNUM_VPNMULTICAST: case SAFNUM_VPNUNIMULTICAST: advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf)); if (advance == -1) printf("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; case SAFNUM_RT_ROUTING_INFO: advance = decode_rt_routing_info(tptr, buf, sizeof(buf)); if (advance == -1) printf("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; default: TCHECK2(*(tptr-3),tlen); 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)); if (advance == -1) printf("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; case SAFNUM_LABUNICAST: advance = decode_labeled_prefix6(tptr, buf, sizeof(buf)); if (advance == -1) printf("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; case SAFNUM_VPNUNICAST: case SAFNUM_VPNMULTICAST: case SAFNUM_VPNUNIMULTICAST: advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf)); if (advance == -1) printf("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; case SAFNUM_RT_ROUTING_INFO: advance = decode_rt_routing_info(tptr, buf, sizeof(buf)); if (advance == -1) printf("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; default: TCHECK2(*(tptr-3),tlen); 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)); if (advance == -1) printf("\n\t (illegal length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; default: TCHECK2(*tptr,tlen); printf("no SAFI %u decoder",safi); if (vflag <= 1) print_unknown_data(tptr,"\n\t ",tlen); advance = 0; tptr = pptr + len; break; } break; default: TCHECK2(*(tptr-3),tlen); 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: TCHECK2(tptr[0], 3); 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 == -1) printf("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; case SAFNUM_LABUNICAST: advance = decode_labeled_prefix4(tptr, buf, sizeof(buf)); if (advance == -1) printf("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; case SAFNUM_VPNUNICAST: case SAFNUM_VPNMULTICAST: case SAFNUM_VPNUNIMULTICAST: advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf)); if (advance == -1) printf("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; default: TCHECK2(*(tptr-3),tlen); 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)); if (advance == -1) printf("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; case SAFNUM_LABUNICAST: advance = decode_labeled_prefix6(tptr, buf, sizeof(buf)); if (advance == -1) printf("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; case SAFNUM_VPNUNICAST: case SAFNUM_VPNMULTICAST: case SAFNUM_VPNUNIMULTICAST: advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf)); if (advance == -1) printf("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; default: TCHECK2(*(tptr-3),tlen); 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)); if (advance == -1) printf("\n\t (illegal length)"); else if (advance == -2) goto trunc; else printf("\n\t %s", buf); break; default: TCHECK2(*(tptr-3),tlen); 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: TCHECK2(*(tptr-3),tlen); 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; TCHECK2(tptr[0], 2); 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)); TCHECK2(*(tptr+2), 6); 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_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; default: TCHECK2(*pptr,len); 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); return 1; trunc: return 0; } 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 == -1) { printf("\n\t (illegal prefix length)"); break; } else if (wpfx == -2) goto trunc; else { i += wpfx; 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("]: "); } if (!bgp_attr_print(&bgpa, &p[i + aoff], alen)) goto trunc; 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 == -1) printf("\n\t (illegal prefix length)"); else if (i == -2) goto trunc; else { printf("\n\t %s", buf); p += i; } } } 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 + 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 int 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 1; trunc: printf("[|BGP]"); return 0; } void bgp_print(const u_char *dat, int length) { const u_char *p; const u_char *ep; const u_char *start; const u_char marker[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, }; struct bgp bgp; u_int16_t hlen; 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)) { if (!bgp_header_print(p, hlen)) return; p += hlen; start = p; } else { printf("\n[|BGP %s]", tok2str(bgp_msg_values, "Unknown Message Type",bgp.bgp_type)); break; } } return; trunc: printf(" [|BGP]"); }