| /* |
| * Copyright (C) 1999 WIDE Project. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the project nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * Extensively modified by Hannes Gredler (hannes@juniper.net) for more |
| * complete BGP support. |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #ifndef lint |
| static const char rcsid[] _U_ = |
| "@(#) $Header: /tcpdump/master/tcpdump/print-bgp.c,v 1.74 2003-11-16 09:36:15 guy Exp $"; |
| #endif |
| |
| #include <tcpdump-stdinc.h> |
| |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include "interface.h" |
| #include "addrtoname.h" |
| #include "extract.h" |
| |
| struct bgp { |
| u_int8_t bgp_marker[16]; |
| u_int16_t bgp_len; |
| u_int8_t bgp_type; |
| }; |
| #define BGP_SIZE 19 /* unaligned */ |
| |
| #define BGP_OPEN 1 |
| #define BGP_UPDATE 2 |
| #define BGP_NOTIFICATION 3 |
| #define BGP_KEEPALIVE 4 |
| #define BGP_ROUTE_REFRESH 5 |
| |
| static struct tok bgp_msg_values[] = { |
| { BGP_OPEN, "Open"}, |
| { BGP_UPDATE, "Update"}, |
| { BGP_NOTIFICATION, "Notification"}, |
| { BGP_KEEPALIVE, "Keepalive"}, |
| { BGP_ROUTE_REFRESH, "Route Refresh"}, |
| { 0, NULL} |
| }; |
| |
| struct bgp_open { |
| u_int8_t bgpo_marker[16]; |
| u_int16_t bgpo_len; |
| u_int8_t bgpo_type; |
| u_int8_t bgpo_version; |
| u_int16_t bgpo_myas; |
| u_int16_t bgpo_holdtime; |
| u_int32_t bgpo_id; |
| u_int8_t bgpo_optlen; |
| /* options should follow */ |
| }; |
| #define BGP_OPEN_SIZE 29 /* unaligned */ |
| |
| struct bgp_opt { |
| u_int8_t bgpopt_type; |
| u_int8_t bgpopt_len; |
| /* variable length */ |
| }; |
| #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */ |
| |
| struct bgp_notification { |
| u_int8_t bgpn_marker[16]; |
| u_int16_t bgpn_len; |
| u_int8_t bgpn_type; |
| u_int8_t bgpn_major; |
| u_int8_t bgpn_minor; |
| }; |
| #define BGP_NOTIFICATION_SIZE 21 /* unaligned */ |
| |
| struct bgp_route_refresh { |
| u_int8_t bgp_marker[16]; |
| u_int16_t len; |
| u_int8_t type; |
| u_int8_t afi[2]; /* the compiler messes this structure up */ |
| u_int8_t res; /* when doing misaligned sequences of int8 and int16 */ |
| u_int8_t safi; /* afi should be int16 - so we have to access it using */ |
| }; /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh) */ |
| #define BGP_ROUTE_REFRESH_SIZE 23 |
| |
| struct bgp_attr { |
| u_int8_t bgpa_flags; |
| u_int8_t bgpa_type; |
| union { |
| u_int8_t len; |
| u_int16_t elen; |
| } bgpa_len; |
| #define bgp_attr_len(p) \ |
| (((p)->bgpa_flags & 0x10) ? \ |
| EXTRACT_16BITS(&(p)->bgpa_len.elen) : (p)->bgpa_len.len) |
| #define bgp_attr_off(p) \ |
| (((p)->bgpa_flags & 0x10) ? 4 : 3) |
| }; |
| |
| #define BGPTYPE_ORIGIN 1 |
| #define BGPTYPE_AS_PATH 2 |
| #define BGPTYPE_NEXT_HOP 3 |
| #define BGPTYPE_MULTI_EXIT_DISC 4 |
| #define BGPTYPE_LOCAL_PREF 5 |
| #define BGPTYPE_ATOMIC_AGGREGATE 6 |
| #define BGPTYPE_AGGREGATOR 7 |
| #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */ |
| #define BGPTYPE_ORIGINATOR_ID 9 /* RFC1998 */ |
| #define BGPTYPE_CLUSTER_LIST 10 /* RFC1998 */ |
| #define BGPTYPE_DPA 11 /* draft-ietf-idr-bgp-dpa */ |
| #define BGPTYPE_ADVERTISERS 12 /* RFC1863 */ |
| #define BGPTYPE_RCID_PATH 13 /* RFC1863 */ |
| #define BGPTYPE_MP_REACH_NLRI 14 /* RFC2283 */ |
| #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC2283 */ |
| #define BGPTYPE_EXTD_COMMUNITIES 16 /* draft-ietf-idr-bgp-ext-communities */ |
| |
| 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_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; |
| |
| plen = pptr[0]; |
| if (32 < plen) |
| return -1; |
| |
| memset(&addr, 0, sizeof(addr)); |
| memcpy(&addr, &pptr[1], (plen + 7) / 8); |
| if (plen % 8) { |
| ((u_char *)&addr)[(plen + 7) / 8 - 1] &= |
| ((0xff00 >> (plen % 8)) & 0xff); |
| } |
| snprintf(buf, buflen, "%s/%d", getname((u_char *)&addr), plen); |
| return 1 + (plen + 7) / 8; |
| } |
| |
| static int |
| decode_labeled_prefix4(const u_char *pptr, char *buf, u_int buflen) |
| { |
| struct in_addr addr; |
| u_int plen; |
| |
| plen = pptr[0]; /* get prefix length */ |
| |
| /* this is one of the weirdnesses of rfc3107 |
| the label length (actually the label + COS bits) |
| is added to the prefix length; |
| we also do only read out just one label - |
| there is no real application for advertisement of |
| stacked labels in a a single BGP message |
| */ |
| |
| plen-=24; /* adjust prefixlen - labellength */ |
| |
| if (32 < plen) |
| return -1; |
| |
| memset(&addr, 0, sizeof(addr)); |
| memcpy(&addr, &pptr[4], (plen + 7) / 8); |
| if (plen % 8) { |
| ((u_char *)&addr)[(plen + 7) / 8 - 1] &= |
| ((0xff00 >> (plen % 8)) & 0xff); |
| } |
| /* the label may get offsetted by 4 bits so lets shift it right */ |
| snprintf(buf, buflen, "%s/%d, label:%u %s", |
| getname((u_char *)&addr), |
| plen, |
| EXTRACT_24BITS(pptr+1)>>4, |
| ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); |
| |
| return 4 + (plen + 7) / 8; |
| } |
| |
| /* RDs and RTs share the same semantics |
| * we use bgp_vpn_rd_print for |
| * printing route targets inside a NLRI */ |
| static char * |
| bgp_vpn_rd_print (const u_char *pptr) { |
| |
| /* allocate space for the 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; |
| |
| plen = pptr[0]; /* get prefix length */ |
| |
| plen-=32; /* adjust prefix length */ |
| |
| if (0 < plen) |
| return -1; |
| |
| memset(&route_target, 0, sizeof(route_target)); |
| memcpy(&route_target, &pptr[1], (plen + 7) / 8); |
| if (plen % 8) { |
| ((u_char *)&route_target)[(plen + 7) / 8 - 1] &= |
| ((0xff00 >> (plen % 8)) & 0xff); |
| } |
| snprintf(buf, buflen, "origin AS: %u, route target %s", |
| EXTRACT_32BITS(pptr+1), |
| bgp_vpn_rd_print((u_char *)&route_target)); |
| |
| return 5 + (plen + 7) / 8; |
| } |
| |
| static int |
| decode_labeled_vpn_prefix4(const u_char *pptr, char *buf, u_int buflen) |
| { |
| struct in_addr addr; |
| u_int plen; |
| |
| plen = pptr[0]; /* get prefix length */ |
| |
| plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ |
| |
| if (32 < plen) |
| return -1; |
| |
| memset(&addr, 0, sizeof(addr)); |
| memcpy(&addr, &pptr[12], (plen + 7) / 8); |
| if (plen % 8) { |
| ((u_char *)&addr)[(plen + 7) / 8 - 1] &= |
| ((0xff00 >> (plen % 8)) & 0xff); |
| } |
| /* the label may get offsetted by 4 bits so lets shift it right */ |
| snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", |
| bgp_vpn_rd_print(pptr+4), |
| getname((u_char *)&addr), |
| plen, |
| EXTRACT_24BITS(pptr+1)>>4, |
| ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); |
| |
| return 12 + (plen + 7) / 8; |
| } |
| |
| static int |
| decode_labeled_vpn_l2(const u_char *pptr, char *buf, u_int buflen) |
| { |
| int plen,tlen,strlen,tlv_type,tlv_len,ttlv_len; |
| plen=EXTRACT_16BITS(pptr); |
| tlen=plen; |
| pptr+=2; |
| strlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u", |
| bgp_vpn_rd_print(pptr), |
| EXTRACT_16BITS(pptr+8), |
| EXTRACT_16BITS(pptr+10), |
| EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */ |
| pptr+=15; |
| tlen-=15; |
| |
| /* ok now the variable part - lets read out TLVs*/ |
| while (tlen>0) { |
| tlv_type=*pptr++; |
| tlv_len=EXTRACT_16BITS(pptr); |
| ttlv_len=tlv_len; |
| pptr+=2; |
| |
| switch(tlv_type) { |
| case 1: |
| strlen+=snprintf(buf+strlen,buflen-strlen, "\n\t\tcircuit status vector (%u) length: %u: 0x", |
| tlv_type, |
| tlv_len); |
| ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */ |
| while (ttlv_len>0) { |
| strlen+=snprintf(buf+strlen,buflen-strlen, "%02x",*pptr++); |
| ttlv_len--; |
| } |
| break; |
| default: |
| snprintf(buf+strlen,buflen-strlen, "\n\t\tunknown TLV #%u, length: %u", |
| tlv_type, |
| tlv_len); |
| break; |
| } |
| tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it tright */ |
| } |
| return plen+2; |
| } |
| |
| #ifdef INET6 |
| static int |
| decode_prefix6(const u_char *pd, char *buf, u_int buflen) |
| { |
| struct in6_addr addr; |
| u_int plen; |
| |
| plen = pd[0]; |
| if (128 < plen) |
| return -1; |
| |
| memset(&addr, 0, sizeof(addr)); |
| memcpy(&addr, &pd[1], (plen + 7) / 8); |
| if (plen % 8) { |
| addr.s6_addr[(plen + 7) / 8 - 1] &= |
| ((0xff00 >> (plen % 8)) & 0xff); |
| } |
| snprintf(buf, buflen, "%s/%d", getname6((u_char *)&addr), plen); |
| return 1 + (plen + 7) / 8; |
| } |
| |
| static int |
| decode_labeled_prefix6(const u_char *pptr, char *buf, u_int buflen) |
| { |
| struct in6_addr addr; |
| u_int plen; |
| |
| plen = pptr[0]; /* get prefix length */ |
| plen-=24; /* adjust prefixlen - labellength */ |
| |
| if (128 < plen) |
| return -1; |
| |
| memset(&addr, 0, sizeof(addr)); |
| memcpy(&addr, &pptr[4], (plen + 7) / 8); |
| if (plen % 8) { |
| addr.s6_addr[(plen + 7) / 8 - 1] &= |
| ((0xff00 >> (plen % 8)) & 0xff); |
| } |
| /* the label may get offsetted by 4 bits so lets shift it right */ |
| snprintf(buf, buflen, "%s/%d, label:%u %s", |
| getname6((u_char *)&addr), |
| plen, |
| EXTRACT_24BITS(pptr+1)>>4, |
| ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); |
| |
| return 4 + (plen + 7) / 8; |
| } |
| |
| static int |
| decode_labeled_vpn_prefix6(const u_char *pptr, char *buf, u_int buflen) |
| { |
| struct in6_addr addr; |
| u_int plen; |
| |
| plen = pptr[0]; /* get prefix length */ |
| |
| plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ |
| |
| if (128 < plen) |
| return -1; |
| |
| memset(&addr, 0, sizeof(addr)); |
| memcpy(&addr, &pptr[12], (plen + 7) / 8); |
| if (plen % 8) { |
| addr.s6_addr[(plen + 7) / 8 - 1] &= |
| ((0xff00 >> (plen % 8)) & 0xff); |
| } |
| /* the label may get offsetted by 4 bits so lets shift it right */ |
| snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", |
| bgp_vpn_rd_print(pptr+4), |
| getname6((u_char *)&addr), |
| plen, |
| EXTRACT_24BITS(pptr+1)>>4, |
| ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); |
| |
| return 12 + (plen + 7) / 8; |
| } |
| #endif |
| |
| static void |
| bgp_attr_print(const struct bgp_attr *attr, const u_char *pptr, int len) |
| { |
| int i; |
| u_int16_t af; |
| u_int8_t safi, snpa; |
| union { /* copy buffer for bandwidth values */ |
| float f; |
| u_int32_t i; |
| } bw; |
| int advance; |
| int tlen; |
| const u_char *tptr; |
| char buf[MAXHOSTNAMELEN + 100]; |
| |
| tptr = pptr; |
| tlen=len; |
| |
| switch (attr->bgpa_type) { |
| case BGPTYPE_ORIGIN: |
| if (len != 1) |
| printf("invalid len"); |
| else |
| printf("%s", tok2str(bgp_origin_values, "Unknown Origin Typecode", tptr[0])); |
| break; |
| case BGPTYPE_AS_PATH: |
| if (len % 2) { |
| printf("invalid len"); |
| break; |
| } |
| if (!len) { |
| printf("empty"); |
| break; |
| } |
| while (tptr < pptr + len) { |
| /* |
| * 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 <= 1) |
| print_unknown_data(tptr,"\n\t ",tlen); |
| break; |
| } |
| |
| tptr +=3; |
| |
| tlen = tptr[0]; |
| tptr++; |
| |
| if (tlen) { |
| printf("\n\t nexthop: "); |
| while (tlen > 0) { |
| switch (af) { |
| case AFNUM_INET: |
| switch(safi) { |
| case SAFNUM_UNICAST: |
| case SAFNUM_MULTICAST: |
| case SAFNUM_UNIMULTICAST: |
| case SAFNUM_LABUNICAST: |
| case SAFNUM_RT_ROUTING_INFO: |
| printf("%s",getname(tptr)); |
| tlen -= sizeof(struct in_addr); |
| tptr += sizeof(struct in_addr); |
| break; |
| case SAFNUM_VPNUNICAST: |
| case SAFNUM_VPNMULTICAST: |
| case SAFNUM_VPNUNIMULTICAST: |
| printf("RD: %s, %s", |
| bgp_vpn_rd_print(tptr), |
| getname(tptr+BGP_VPN_RD_LEN)); |
| tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN); |
| tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN); |
| break; |
| default: |
| printf("no SAFI %u decoder",safi); |
| if (vflag <= 1) |
| print_unknown_data(tptr,"\n\t ",tlen); |
| break; |
| } |
| break; |
| #ifdef INET6 |
| case AFNUM_INET6: |
| switch(safi) { |
| case SAFNUM_UNICAST: |
| case SAFNUM_MULTICAST: |
| case SAFNUM_UNIMULTICAST: |
| case SAFNUM_LABUNICAST: |
| case SAFNUM_RT_ROUTING_INFO: |
| printf("%s", getname6(tptr)); |
| tlen -= sizeof(struct in6_addr); |
| tptr += sizeof(struct in6_addr); |
| break; |
| case SAFNUM_VPNUNICAST: |
| case SAFNUM_VPNMULTICAST: |
| case SAFNUM_VPNUNIMULTICAST: |
| printf("RD: %s, %s", |
| bgp_vpn_rd_print(tptr), |
| getname6(tptr+BGP_VPN_RD_LEN)); |
| tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); |
| tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); |
| break; |
| default: |
| printf("no SAFI %u decoder",safi); |
| if (vflag <= 1) |
| print_unknown_data(tptr,"\n\t ",tlen); |
| break; |
| } |
| break; |
| #endif |
| case AFNUM_L2VPN: |
| switch(safi) { |
| case SAFNUM_VPNUNICAST: |
| case SAFNUM_VPNMULTICAST: |
| case SAFNUM_VPNUNIMULTICAST: |
| printf("%s", getname(tptr)); |
| tlen -= (sizeof(struct in_addr)); |
| tptr += (sizeof(struct in_addr)); |
| break; |
| default: |
| printf("no SAFI %u decoder",safi); |
| if (vflag <= 1) |
| print_unknown_data(tptr,"\n\t ",tlen); |
| break; |
| } |
| break; |
| |
| default: |
| printf("no AFI %u decoder",af); |
| if (vflag <= 1) |
| print_unknown_data(tptr,"\n\t ",tlen); |
| break; |
| } |
| } |
| } |
| tptr += tlen; |
| |
| snpa = tptr[0]; |
| tptr++; |
| |
| if (snpa) { |
| printf("\n\t %u SNPA", snpa); |
| for (/*nothing*/; snpa > 0; snpa--) { |
| printf("\n\t %d bytes", tptr[0]); |
| tptr += tptr[0] + 1; |
| } |
| } else { |
| printf(", no SNPA"); |
| } |
| |
| while (len - (tptr - pptr) > 0) { |
| switch (af) { |
| case AFNUM_INET: |
| switch (safi) { |
| case SAFNUM_UNICAST: |
| case SAFNUM_MULTICAST: |
| case SAFNUM_UNIMULTICAST: |
| advance = decode_prefix4(tptr, buf, sizeof(buf)); |
| if (advance >= 0) |
| printf("\n\t %s", buf); |
| else |
| printf("\n\t (illegal prefix length)"); |
| break; |
| case SAFNUM_LABUNICAST: |
| advance = decode_labeled_prefix4(tptr, buf, sizeof(buf)); |
| printf("\n\t %s", buf); |
| break; |
| case SAFNUM_VPNUNICAST: |
| case SAFNUM_VPNMULTICAST: |
| case SAFNUM_VPNUNIMULTICAST: |
| advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf)); |
| printf("\n\t %s", buf); |
| break; |
| case SAFNUM_RT_ROUTING_INFO: |
| advance = decode_rt_routing_info(tptr, buf, sizeof(buf)); |
| printf("\n\t %s", buf); |
| break; |
| default: |
| printf("\n\t no SAFI %u decoder",safi); |
| if (vflag <= 1) |
| print_unknown_data(tptr-3,"\n\t ",tlen); |
| advance = 0; |
| tptr = pptr + len; |
| break; |
| } |
| break; |
| #ifdef INET6 |
| case AFNUM_INET6: |
| switch (safi) { |
| case SAFNUM_UNICAST: |
| case SAFNUM_MULTICAST: |
| case SAFNUM_UNIMULTICAST: |
| advance = decode_prefix6(tptr, buf, sizeof(buf)); |
| printf("\n\t %s", buf); |
| break; |
| case SAFNUM_LABUNICAST: |
| advance = decode_labeled_prefix6(tptr, buf, sizeof(buf)); |
| printf("\n\t %s", buf); |
| break; |
| case SAFNUM_VPNUNICAST: |
| case SAFNUM_VPNMULTICAST: |
| case SAFNUM_VPNUNIMULTICAST: |
| advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf)); |
| printf("\n\t %s", buf); |
| break; |
| case SAFNUM_RT_ROUTING_INFO: |
| advance = decode_rt_routing_info(tptr, buf, sizeof(buf)); |
| printf("\n\t %s", buf); |
| break; |
| default: |
| printf("\n\t no SAFI %u decoder ",safi); |
| if (vflag <= 1) |
| print_unknown_data(tptr-3,"\n\t ",tlen); |
| advance = 0; |
| tptr = pptr + len; |
| break; |
| } |
| break; |
| #endif |
| case AFNUM_L2VPN: |
| switch(safi) { |
| case SAFNUM_VPNUNICAST: |
| case SAFNUM_VPNMULTICAST: |
| case SAFNUM_VPNUNIMULTICAST: |
| advance = decode_labeled_vpn_l2(tptr, buf, sizeof(buf)); |
| printf("\n\t %s", buf); |
| break; |
| default: |
| printf("no SAFI %u decoder",safi); |
| if (vflag <= 1) |
| print_unknown_data(tptr,"\n\t ",tlen); |
| advance = 0; |
| tptr = pptr + len; |
| break; |
| } |
| break; |
| |
| |
| default: |
| printf("\n\t no AFI %u decoder ",af); |
| if (vflag <= 1) |
| print_unknown_data(tptr-3,"\n\t ",tlen); |
| advance = 0; |
| tptr = pptr + len; |
| break; |
| } |
| tptr += advance; |
| } |
| break; |
| |
| case BGPTYPE_MP_UNREACH_NLRI: |
| af = EXTRACT_16BITS(tptr); |
| safi = tptr[2]; |
| |
| printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)", |
| tok2str(bgp_afi_values, "Unknown AFI", af), |
| af, |
| (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ |
| tok2str(bgp_safi_values, "Unknown SAFI", safi), |
| safi); |
| |
| tptr += 3; |
| |
| while (len - (tptr - pptr) > 0) { |
| switch (af) { |
| case AFNUM_INET: |
| switch (safi) { |
| case SAFNUM_UNICAST: |
| case SAFNUM_MULTICAST: |
| case SAFNUM_UNIMULTICAST: |
| advance = decode_prefix4(tptr, buf, sizeof(buf)); |
| if (advance >= 0) |
| printf("\n\t %s", buf); |
| else |
| printf("\n\t (illegal prefix length)"); |
| break; |
| case SAFNUM_LABUNICAST: |
| advance = decode_labeled_prefix4(tptr, buf, sizeof(buf)); |
| printf("\n\t %s", buf); |
| break; |
| case SAFNUM_VPNUNICAST: |
| case SAFNUM_VPNMULTICAST: |
| case SAFNUM_VPNUNIMULTICAST: |
| advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf)); |
| printf("\n\t %s", buf); |
| break; |
| default: |
| printf("\n\t no SAFI %u decoder",safi); |
| if (vflag <= 1) |
| print_unknown_data(tptr-3,"\n\t ",tlen); |
| advance = 0; |
| tptr = pptr + len; |
| break; |
| } |
| break; |
| |
| #ifdef INET6 |
| case AFNUM_INET6: |
| switch (safi) { |
| case SAFNUM_UNICAST: |
| case SAFNUM_MULTICAST: |
| case SAFNUM_UNIMULTICAST: |
| advance = decode_prefix6(tptr, buf, sizeof(buf)); |
| printf("\n\t %s", buf); |
| break; |
| case SAFNUM_LABUNICAST: |
| advance = decode_labeled_prefix6(tptr, buf, sizeof(buf)); |
| printf("\n\t %s", buf); |
| break; |
| case SAFNUM_VPNUNICAST: |
| case SAFNUM_VPNMULTICAST: |
| case SAFNUM_VPNUNIMULTICAST: |
| advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf)); |
| printf("\n\t %s", buf); |
| break; |
| default: |
| printf("\n\t no SAFI %u decoder",safi); |
| if (vflag <= 1) |
| print_unknown_data(tptr-3,"\n\t ",tlen); |
| advance = 0; |
| tptr = pptr + len; |
| break; |
| } |
| break; |
| #endif |
| |
| case AFNUM_L2VPN: |
| switch(safi) { |
| case SAFNUM_VPNUNICAST: |
| case SAFNUM_VPNMULTICAST: |
| case SAFNUM_VPNUNIMULTICAST: |
| advance = decode_labeled_vpn_l2(tptr, buf, sizeof(buf)); |
| printf("\n\t %s", buf); |
| break; |
| default: |
| printf("no SAFI %u decoder",safi); |
| if (vflag <= 1) |
| print_unknown_data(tptr-3,"\n\t ",tlen); |
| advance = 0; |
| tptr = pptr + len; |
| break; |
| } |
| break; |
| |
| default: |
| printf("\n\t no AFI %u decoder",af); |
| if (vflag <= 1) |
| print_unknown_data(tptr-3,"\n\t ",tlen); |
| advance = 0; |
| tptr = pptr + len; |
| break; |
| } |
| |
| tptr += advance; |
| } |
| break; |
| case BGPTYPE_EXTD_COMMUNITIES: |
| if (len % 8) { |
| printf("invalid len"); |
| break; |
| } |
| while (tlen>0) { |
| u_int16_t extd_comm; |
| extd_comm=EXTRACT_16BITS(tptr); |
| |
| printf("\n\t %s (0x%04x), Flags [%s]", |
| tok2str(bgp_extd_comm_subtype_values, "unknown extd community typecode", extd_comm), |
| extd_comm, |
| bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)); |
| |
| switch(extd_comm) { |
| case BGP_EXT_COM_RT_0: |
| case BGP_EXT_COM_RO_0: |
| printf(": %u:%s", |
| EXTRACT_16BITS(tptr+2), |
| getname(tptr+4)); |
| break; |
| case BGP_EXT_COM_RT_1: |
| case BGP_EXT_COM_RO_1: |
| printf(": %s:%u", |
| getname(tptr+2), |
| EXTRACT_16BITS(tptr+6)); |
| break; |
| case BGP_EXT_COM_RT_2: |
| case BGP_EXT_COM_RO_2: |
| printf(": %u:%u", |
| EXTRACT_32BITS(tptr+2), |
| EXTRACT_16BITS(tptr+6)); |
| break; |
| case BGP_EXT_COM_LINKBAND: |
| bw.i = EXTRACT_32BITS(tptr+2); |
| printf(": bandwidth: %.3f Mbps", |
| bw.f*8/1000000); |
| break; |
| case BGP_EXT_COM_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: |
| printf("\n\t no Attribute %u decoder",attr->bgpa_type); /* we have no decoder for the attribute */ |
| if (vflag <= 1) |
| print_unknown_data(pptr,"\n\t ",len); |
| break; |
| } |
| if (vflag > 1 && len) /* omit zero length attributes*/ |
| print_unknown_data(pptr,"\n\t ",len); |
| } |
| |
| static void |
| bgp_open_print(const u_char *dat, int length) |
| { |
| struct bgp_open bgpo; |
| struct bgp_opt bgpopt; |
| int hlen; |
| const u_char *opt; |
| int i,cap_type,cap_len,tcap_len,cap_offset; |
| |
| TCHECK2(dat[0], BGP_OPEN_SIZE); |
| memcpy(&bgpo, dat, BGP_OPEN_SIZE); |
| hlen = ntohs(bgpo.bgpo_len); |
| |
| printf("\n\t Version %d, ", bgpo.bgpo_version); |
| printf("my AS %u, ", ntohs(bgpo.bgpo_myas)); |
| printf("Holdtime %us, ", ntohs(bgpo.bgpo_holdtime)); |
| printf("ID %s", getname((u_char *)&bgpo.bgpo_id)); |
| printf("\n\t Optional parameters, length: %u", bgpo.bgpo_optlen); |
| |
| /* some little sanity checking */ |
| if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE) |
| return; |
| |
| /* ugly! */ |
| opt = &((const struct bgp_open *)dat)->bgpo_optlen; |
| opt++; |
| |
| i = 0; |
| while (i < bgpo.bgpo_optlen) { |
| TCHECK2(opt[i], BGP_OPT_SIZE); |
| memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE); |
| if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) { |
| printf("\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len); |
| break; |
| } |
| |
| printf("\n\t Option %s (%u), length: %u", |
| tok2str(bgp_opt_values,"Unknown", bgpopt.bgpopt_type), |
| bgpopt.bgpopt_type, |
| bgpopt.bgpopt_len); |
| |
| /* now lets decode the options we know*/ |
| switch(bgpopt.bgpopt_type) { |
| case BGP_OPT_CAP: |
| cap_type=opt[i+BGP_OPT_SIZE]; |
| cap_len=opt[i+BGP_OPT_SIZE+1]; |
| tcap_len=cap_len; |
| printf("\n\t %s, length: %u", |
| tok2str(bgp_capcode_values,"Unknown", cap_type), |
| cap_len); |
| switch(cap_type) { |
| case BGP_CAPCODE_MP: |
| printf("\n\t\tAFI %s (%u), SAFI %s (%u)", |
| tok2str(bgp_afi_values,"Unknown", EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2)), |
| EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2), |
| tok2str(bgp_safi_values,"Unknown", opt[i+BGP_OPT_SIZE+5]), |
| opt[i+BGP_OPT_SIZE+5]); |
| break; |
| case BGP_CAPCODE_RESTART: |
| printf("\n\t\tRestart Flags: [%s], Restart Time %us", |
| ((opt[i+BGP_OPT_SIZE+2])&0x80) ? "R" : "none", |
| EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2)&0xfff); |
| tcap_len-=2; |
| cap_offset=4; |
| while(tcap_len>=4) { |
| printf("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s", |
| tok2str(bgp_afi_values,"Unknown", EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+cap_offset)), |
| EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+cap_offset), |
| tok2str(bgp_safi_values,"Unknown", opt[i+BGP_OPT_SIZE+cap_offset+2]), |
| opt[i+BGP_OPT_SIZE+cap_offset+2], |
| ((opt[i+BGP_OPT_SIZE+cap_offset+3])&0x80) ? "yes" : "no" ); |
| tcap_len-=4; |
| cap_offset+=4; |
| } |
| break; |
| case BGP_CAPCODE_RR: |
| case BGP_CAPCODE_RR_CISCO: |
| break; |
| default: |
| printf("\n\t\tno decoder for Capability %u", |
| cap_type); |
| if (vflag <= 1) |
| print_unknown_data(&opt[i+BGP_OPT_SIZE+2],"\n\t\t",cap_len); |
| break; |
| } |
| if (vflag > 1) |
| print_unknown_data(&opt[i+BGP_OPT_SIZE+2],"\n\t\t",cap_len); |
| break; |
| case BGP_OPT_AUTH: |
| default: |
| printf("\n\t no decoder for option %u", |
| bgpopt.bgpopt_type); |
| break; |
| } |
| |
| i += BGP_OPT_SIZE + bgpopt.bgpopt_len; |
| } |
| return; |
| trunc: |
| printf("[|BGP]"); |
| } |
| |
| static void |
| bgp_update_print(const u_char *dat, int length) |
| { |
| struct bgp bgp; |
| struct bgp_attr bgpa; |
| int hlen; |
| const u_char *p; |
| int len; |
| int i; |
| |
| TCHECK2(dat[0], BGP_SIZE); |
| memcpy(&bgp, dat, BGP_SIZE); |
| hlen = ntohs(bgp.bgp_len); |
| p = dat + BGP_SIZE; /*XXX*/ |
| |
| /* Unfeasible routes */ |
| len = EXTRACT_16BITS(p); |
| if (len) { |
| /* |
| * Without keeping state from the original NLRI message, |
| * it's not possible to tell if this a v4 or v6 route, |
| * so only try to decode it if we're not v6 enabled. |
| */ |
| #ifdef INET6 |
| printf("\n\t Withdrawn routes: %d bytes", len); |
| #else |
| char buf[MAXHOSTNAMELEN + 100]; |
| int wpfx; |
| |
| TCHECK2(p[2], len); |
| i = 2; |
| |
| printf("\n\t Withdrawn routes:"); |
| |
| while(i < 2 + len) { |
| wpfx = decode_prefix4(&p[i], buf, sizeof(buf)); |
| if (wpfx >= 0) { |
| i += wpfx; |
| printf("\n\t %s", buf); |
| } else { |
| printf("\n\t (illegal prefix length)"); |
| break; |
| } |
| } |
| #endif |
| } |
| p += 2 + len; |
| |
| TCHECK2(p[0], 2); |
| len = EXTRACT_16BITS(p); |
| if (len) { |
| /* do something more useful!*/ |
| i = 2; |
| while (i < 2 + len) { |
| int alen, aoff; |
| |
| TCHECK2(p[i], sizeof(bgpa)); |
| memcpy(&bgpa, &p[i], sizeof(bgpa)); |
| alen = bgp_attr_len(&bgpa); |
| aoff = bgp_attr_off(&bgpa); |
| |
| printf("\n\t %s (%u), length: %u", |
| tok2str(bgp_attr_values, "Unknown Attribute", bgpa.bgpa_type), |
| bgpa.bgpa_type, |
| alen); |
| |
| if (bgpa.bgpa_flags) { |
| printf(", Flags [%s%s%s%s", |
| bgpa.bgpa_flags & 0x80 ? "O" : "", |
| bgpa.bgpa_flags & 0x40 ? "T" : "", |
| bgpa.bgpa_flags & 0x20 ? "P" : "", |
| bgpa.bgpa_flags & 0x10 ? "E" : ""); |
| if (bgpa.bgpa_flags & 0xf) |
| printf("+%x", bgpa.bgpa_flags & 0xf); |
| printf("]: "); |
| } |
| bgp_attr_print(&bgpa, &p[i + aoff], alen); |
| i += aoff + alen; |
| } |
| } |
| p += 2 + len; |
| |
| if (dat + length > p) { |
| printf("\n\t Updated routes:"); |
| while (dat + length > p) { |
| char buf[MAXHOSTNAMELEN + 100]; |
| i = decode_prefix4(p, buf, sizeof(buf)); |
| if (i >= 0) { |
| printf("\n\t %s", buf); |
| p += i; |
| } else { |
| printf("\n\t (illegal prefix length)"); |
| break; |
| } |
| } |
| } |
| return; |
| trunc: |
| printf("[|BGP]"); |
| } |
| |
| static void |
| bgp_notification_print(const u_char *dat, int length) |
| { |
| struct bgp_notification bgpn; |
| int hlen; |
| const u_char *tptr; |
| |
| TCHECK2(dat[0], BGP_NOTIFICATION_SIZE); |
| memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE); |
| hlen = ntohs(bgpn.bgpn_len); |
| |
| /* some little sanity checking */ |
| if (length<BGP_NOTIFICATION_SIZE) |
| return; |
| |
| printf(", %s (%u)", |
| tok2str(bgp_notify_major_values, "Unknown Error", bgpn.bgpn_major), |
| bgpn.bgpn_major); |
| |
| switch (bgpn.bgpn_major) { |
| |
| case BGP_NOTIFY_MAJOR_MSG: |
| printf(", subcode %s (%u)", |
| tok2str(bgp_notify_minor_msg_values, "Unknown", bgpn.bgpn_minor), |
| bgpn.bgpn_minor); |
| break; |
| case BGP_NOTIFY_MAJOR_OPEN: |
| printf(", subcode %s (%u)", |
| tok2str(bgp_notify_minor_open_values, "Unknown", bgpn.bgpn_minor), |
| bgpn.bgpn_minor); |
| break; |
| case BGP_NOTIFY_MAJOR_UPDATE: |
| printf(", subcode %s (%u)", |
| tok2str(bgp_notify_minor_update_values, "Unknown", bgpn.bgpn_minor), |
| bgpn.bgpn_minor); |
| break; |
| case BGP_NOTIFY_MAJOR_CAP: |
| printf(" subcode %s (%u)", |
| tok2str(bgp_notify_minor_cap_values, "Unknown", bgpn.bgpn_minor), |
| bgpn.bgpn_minor); |
| case BGP_NOTIFY_MAJOR_CEASE: |
| printf(", subcode %s (%u)", |
| tok2str(bgp_notify_minor_cease_values, "Unknown", bgpn.bgpn_minor), |
| bgpn.bgpn_minor); |
| |
| /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes |
| * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES |
| */ |
| if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) { |
| tptr = dat + BGP_NOTIFICATION_SIZE; |
| TCHECK2(*tptr, 7); |
| printf(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u", |
| tok2str(bgp_afi_values, "Unknown", EXTRACT_16BITS(tptr)), |
| EXTRACT_16BITS(tptr), |
| tok2str(bgp_safi_values, "Unknown", *(tptr+2)), |
| *(tptr+2), |
| EXTRACT_32BITS(tptr+3)); |
| } |
| break; |
| default: |
| break; |
| } |
| |
| return; |
| trunc: |
| printf("[|BGP]"); |
| } |
| |
| static void |
| bgp_route_refresh_print(const u_char *pptr, int len) { |
| |
| const struct bgp_route_refresh *bgp_route_refresh_header; |
| bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr; |
| |
| printf("\n\t AFI %s (%u), SAFI %s (%u)", |
| tok2str(bgp_afi_values,"Unknown", |
| EXTRACT_16BITS(&bgp_route_refresh_header->afi)), /* this stinks but the compiler pads the structure weird */ |
| EXTRACT_16BITS(&bgp_route_refresh_header->afi), |
| tok2str(bgp_safi_values,"Unknown", |
| bgp_route_refresh_header->safi), |
| bgp_route_refresh_header->safi); |
| |
| if (vflag > 1) |
| print_unknown_data(pptr,"\n\t ", len); |
| |
| return; |
| } |
| |
| static void |
| bgp_header_print(const u_char *dat, int length) |
| { |
| struct bgp bgp; |
| |
| TCHECK2(dat[0], BGP_SIZE); |
| memcpy(&bgp, dat, BGP_SIZE); |
| printf("\n\t%s Message (%u), length: %u", |
| tok2str(bgp_msg_values, "Unknown", bgp.bgp_type), |
| bgp.bgp_type, |
| length); |
| |
| switch (bgp.bgp_type) { |
| case BGP_OPEN: |
| bgp_open_print(dat, length); |
| break; |
| case BGP_UPDATE: |
| bgp_update_print(dat, length); |
| break; |
| case BGP_NOTIFICATION: |
| bgp_notification_print(dat, length); |
| break; |
| case BGP_KEEPALIVE: |
| break; |
| case BGP_ROUTE_REFRESH: |
| bgp_route_refresh_print(dat, length); |
| break; |
| default: |
| /* we have no decoder for the BGP message */ |
| printf("\n\t no Message %u decoder",bgp.bgp_type); |
| print_unknown_data(dat,"\n\t ",length); |
| break; |
| } |
| return; |
| trunc: |
| printf("[|BGP]"); |
| } |
| |
| void |
| bgp_print(const u_char *dat, int length) |
| { |
| const u_char *p; |
| const u_char *ep; |
| const u_char *start; |
| const u_char marker[] = { |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| }; |
| struct bgp bgp; |
| u_int16_t hlen; |
| |
| ep = dat + length; |
| if (snapend < dat + length) |
| ep = snapend; |
| |
| printf(": BGP, length: %u",length); |
| |
| if (vflag < 1) /* lets be less chatty */ |
| return; |
| |
| p = dat; |
| start = p; |
| while (p < snapend) { |
| if (!TTEST2(p[0], 1)) |
| break; |
| if (p[0] != 0xff) { |
| p++; |
| continue; |
| } |
| |
| if (!TTEST2(p[0], sizeof(marker))) |
| break; |
| if (memcmp(p, marker, sizeof(marker)) != 0) { |
| p++; |
| continue; |
| } |
| |
| /* found BGP header */ |
| TCHECK2(p[0], BGP_SIZE); /*XXX*/ |
| memcpy(&bgp, p, BGP_SIZE); |
| |
| if (start != p) |
| printf(" [|BGP]"); |
| |
| hlen = ntohs(bgp.bgp_len); |
| if (hlen < BGP_SIZE) { |
| printf("\n[|BGP Bogus header length %u < %u]", hlen, |
| BGP_SIZE); |
| break; |
| } |
| |
| if (TTEST2(p[0], hlen)) { |
| bgp_header_print(p, hlen); |
| p += hlen; |
| start = p; |
| } else { |
| printf("\n[|BGP %s]", tok2str(bgp_msg_values, "Unknown Message Type",bgp.bgp_type)); |
| break; |
| } |
| } |
| |
| return; |
| |
| trunc: |
| printf(" [|BGP]"); |
| } |
