/* * 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 1.35 2002-07-14 09:36:00 hannes Exp $"; #endif #include #include #include #include #include #include #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 static struct tok bgp_msg_values[] = { { BGP_OPEN, "Open"}, { BGP_UPDATE, "Update"}, { BGP_NOTIFICATION, "Notification"}, { BGP_KEEPALIVE, "Keepalive"}, { 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_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} }; static struct tok bgp_opt_values[] = { { 1, "Authentication Information"}, { 2, "Capabilities Advertisement"}, { 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[] = { { 1, "IGP"}, { 2, "EGP"}, { 3, "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 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 int decode_prefix4(const u_char *pd, char *buf, u_int buflen) { struct in_addr addr; u_int plen; plen = pd[0]; if (plen < 0 || 32 < plen) return -1; memset(&addr, 0, sizeof(addr)); memcpy(&addr, &pd[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 *pd, char *buf, u_int buflen) { struct in_addr addr; u_int plen; plen = pd[0]; /* get prefix length */ /* this is one of the weirdnesses of rfc3107 the label length (actually the label + COS bits) is added of the prefix length; we also do only read out just one label - there is no real application for advertisment 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, &pd[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(pd+1)>>4, ((pd[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); return 4 + (plen + 7) / 8; } #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 *dat, int len) { int i; u_int16_t af; u_int8_t safi, snpa; int advance; int tlen; const u_char *p; char buf[MAXHOSTNAMELEN + 100]; p = dat; switch (attr->bgpa_type) { case BGPTYPE_ORIGIN: if (len != 1) printf(" invalid len"); else printf(" %s", tok2str(bgp_origin_values, "Unknown Origin Typecode", p[0])); break; case BGPTYPE_AS_PATH: if (len % 2) { printf(" invalid len"); break; } while (p < dat + len) { /* * under RFC1965, p[0] means: * 1: AS_SET 2: AS_SEQUENCE * 3: AS_CONFED_SET 4: AS_CONFED_SEQUENCE */ printf(" "); if (p[0] == 3 || p[0] == 4) printf("confed"); printf("%s", (p[0] & 1) ? "{" : ""); for (i = 0; i < p[1] * 2; i += 2) { printf("%s%u", i == 0 ? "" : " ", EXTRACT_16BITS(&p[2 + i])); } printf("%s", (p[0] & 1) ? "}" : ""); p += 2 + p[1] * 2; } break; case BGPTYPE_NEXT_HOP: if (len != 4) printf(" invalid len"); else printf(" %s", getname(p)); break; case BGPTYPE_MULTI_EXIT_DISC: case BGPTYPE_LOCAL_PREF: if (len != 4) printf(" invalid len"); else printf(" %u", EXTRACT_32BITS(p)); 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(p), getname(p + 2)); break; case BGPTYPE_COMMUNITIES: if (len % 4) { printf(" invalid len"); break; } for (i = 0; i < len; i += 4) { u_int32_t comm; comm = EXTRACT_32BITS(&p[i]); 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(" (AS #%d value 0x%04x)", (comm >> 16) & 0xffff, comm & 0xffff); break; } } break; case BGPTYPE_MP_REACH_NLRI: af = EXTRACT_16BITS(p); safi = p[2]; printf(" AFI %s, %sSAFI %s,", tok2str(bgp_afi_values, "Unknown AFI", af), (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ tok2str(bgp_safi_values, "Unknown SAFI", safi)); p += 3; if (af == AFNUM_INET) ; #ifdef INET6 else if (af == AFNUM_INET6) ; #endif else break; tlen = p[0]; if (tlen) { printf(" nexthop"); i = 0; while (i < tlen) { switch (af) { case AFNUM_INET: printf(" %s", getname(p + 1 + i)); i += sizeof(struct in_addr); break; #ifdef INET6 case AFNUM_INET6: printf(" %s", getname6(p + 1 + i)); i += sizeof(struct in6_addr); break; #endif default: printf(" (unknown af)"); i = tlen; /*exit loop*/ break; } } printf(","); } p += 1 + tlen; snpa = p[0]; p++; if (snpa) { printf(" %u snpa", snpa); for (/*nothing*/; snpa > 0; snpa--) { printf("(%d bytes)", p[0]); p += p[0] + 1; } printf(","); } else { printf(" no spna,"); } printf(" NLRI"); while (len - (p - dat) > 0) { switch (af) { case AFNUM_INET: switch (safi) { case SAFNUM_UNICAST: case SAFNUM_MULTICAST: case SAFNUM_UNIMULTICAST: advance = decode_prefix4(p, buf, sizeof(buf)); printf(" %s", buf); break; case SAFNUM_LABUNICAST: advance = decode_labeled_prefix4(p, buf, sizeof(buf)); printf(" %s", buf); break; default: printf(" (no SAFI %u decoder)",safi); advance = 0; p = dat + len; break; } break; #ifdef INET6 case AFNUM_INET6: switch (safi) { case SAFNUM_UNICAST: case SAFNUM_MULTICAST: case SAFNUM_UNIMULTICAST: advance = decode_prefix6(p, buf, sizeof(buf)); printf(" %s", buf); break; default: printf(" (no SAFI %u decoder)",safi); advance = 0; p = dat + len; break; } break; #endif default: printf(" (unknown AF)"); advance = 0; p = dat + len; break; } p += advance; } break; case BGPTYPE_MP_UNREACH_NLRI: af = EXTRACT_16BITS(p); safi = p[2]; printf(" AFI %s, %sSAFI %s,", tok2str(bgp_afi_values, "Unknown AFI", af), (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ tok2str(bgp_safi_values, "Unknown SAFI", safi)); p += 3; printf(" Withdrawn routes"); while (len - (p - dat) > 0) { switch (af) { case AFNUM_INET: switch (safi) { case SAFNUM_UNICAST: case SAFNUM_MULTICAST: case SAFNUM_UNIMULTICAST: advance = decode_prefix4(p, buf, sizeof(buf)); printf(" %s", buf); break; case SAFNUM_LABUNICAST: advance = decode_labeled_prefix4(p, buf, sizeof(buf)); printf(" %s", buf); break; default: printf(" (no SAFI %u decoder)",safi); advance = 0; p = dat + len; break; } break; #ifdef INET6 case AFNUM_INET6: switch (safi) { case SAFNUM_UNICAST: case SAFNUM_MULTICAST: case SAFNUM_UNIMULTICAST: advance = decode_prefix6(p, buf, sizeof(buf)); printf(" %s", buf); break; default: printf(" (no SAFI %u decoder)",safi); advance = 0; p = dat + len; break; } break; #endif default: printf(" (unknown AF)"); advance = 0; p = dat + len; break; } p += advance; } break; default: break; } } 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; TCHECK2(dat[0], BGP_OPEN_SIZE); memcpy(&bgpo, dat, BGP_OPEN_SIZE); hlen = ntohs(bgpo.bgpo_len); printf(": Version %d,", bgpo.bgpo_version); printf(" AS #%u,", ntohs(bgpo.bgpo_myas)); printf(" Holdtime %u,", ntohs(bgpo.bgpo_holdtime)); printf(" ID %s,", getname((u_char *)&bgpo.bgpo_id)); printf(" Option 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(" [|opt %d %d]", bgpopt.bgpopt_len, bgpopt.bgpopt_type); break; } printf(" (option %s, len=%d)", tok2str(bgp_opt_values,"Unknown", bgpopt.bgpopt_type), bgpopt.bgpopt_len); 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; int newline; TCHECK2(dat[0], BGP_SIZE); memcpy(&bgp, dat, BGP_SIZE); hlen = ntohs(bgp.bgp_len); p = dat + BGP_SIZE; /*XXX*/ printf(":"); /* 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(" (Withdrawn routes: %d bytes)", len); #else char buf[MAXHOSTNAMELEN + 100]; TCHECK2(p[2], len); i = 2; printf(" (Withdrawn routes:"); while(i < 2 + len) { i += decode_prefix4(&p[i], buf, sizeof(buf)); printf(" %s", buf); } printf(")\n"); #endif } p += 2 + len; TCHECK2(p[0], 2); len = EXTRACT_16BITS(p); if (len) { /* do something more useful!*/ i = 2; printf(" (Path attributes:"); /* ) */ newline = 0; 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); if (vflag && newline) printf("\n\t\t"); else printf(" "); printf("(%s", tok2str(bgp_attr_values, "Unknown Attribute", bgpa.bgpa_type)); if (bgpa.bgpa_flags) { printf("[%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); newline = 1; /* ( */ printf(")"); i += aoff + alen; } /* ( */ printf(")"); } p += 2 + len; if (len && dat + length > p) printf("\n\t\t"); if (dat + length > p) { printf("(NLRI:"); /* ) */ while (dat + length > p) { char buf[MAXHOSTNAMELEN + 100]; i = decode_prefix4(p, buf, sizeof(buf)); printf(" %s", buf); if (i < 0) break; p += i; } /* ( */ printf(")"); } 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_header_print(const u_char *dat, int length) { struct bgp bgp; TCHECK2(dat[0], BGP_SIZE); memcpy(&bgp, dat, BGP_SIZE); printf("(%s", tok2str(bgp_msg_values, "Unknown Message Type", bgp.bgp_type)); 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; } /* ( */ printf(")"); 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; int newline; ep = dat + length; if (snapend < dat + length) ep = snapend; printf(": BGP"); p = dat; newline = 0; 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 (vflag && newline) printf("\n\t"); else printf(" "); if (TTEST2(p[0], hlen)) { bgp_header_print(p, hlen); newline = 1; p += hlen; start = p; } else { printf("[|BGP %s]", tok2str(bgp_msg_values, "Unknown Message Type",bgp.bgp_type)); break; } } return; trunc: printf(" [|BGP]"); }