X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/ff8464bffd24a451a5a4c08c6c6ab7d0a2c88785..a8c33a5850cd9d2f39e56c06b645c283225d78c4:/print-bgp.c diff --git a/print-bgp.c b/print-bgp.c index 553b66b4..4d8254f0 100644 --- a/print-bgp.c +++ b/print-bgp.c @@ -32,11 +32,13 @@ /* \summary: Border Gateway Protocol (BGP) printer */ +/* specification: RFC 4271 */ + #ifdef HAVE_CONFIG_H -#include "config.h" +#include #endif -#include +#include "netdissect-stdinc.h" #include #include @@ -48,16 +50,16 @@ #include "l2vpn.h" struct bgp { - uint8_t bgp_marker[16]; - uint16_t bgp_len; - uint8_t bgp_type; + nd_byte bgp_marker[16]; + nd_uint16_t bgp_len; + nd_uint8_t bgp_type; }; -#define BGP_SIZE 19 /* unaligned */ +#define BGP_SIZE 19 /* unaligned */ -#define BGP_OPEN 1 -#define BGP_UPDATE 2 -#define BGP_NOTIFICATION 3 -#define BGP_KEEPALIVE 4 +#define BGP_OPEN 1 +#define BGP_UPDATE 2 +#define BGP_NOTIFICATION 3 +#define BGP_KEEPALIVE 4 #define BGP_ROUTE_REFRESH 5 static const struct tok bgp_msg_values[] = { @@ -70,79 +72,79 @@ static const struct tok bgp_msg_values[] = { }; struct bgp_open { - uint8_t bgpo_marker[16]; - uint16_t bgpo_len; - uint8_t bgpo_type; - uint8_t bgpo_version; - uint16_t bgpo_myas; - uint16_t bgpo_holdtime; - uint32_t bgpo_id; - uint8_t bgpo_optlen; - /* options should follow */ + nd_byte bgpo_marker[16]; + nd_uint16_t bgpo_len; + nd_uint8_t bgpo_type; + nd_uint8_t bgpo_version; + nd_uint16_t bgpo_myas; + nd_uint16_t bgpo_holdtime; + nd_uint32_t bgpo_id; + nd_uint8_t bgpo_optlen; + /* options should follow */ }; -#define BGP_OPEN_SIZE 29 /* unaligned */ +#define BGP_OPEN_SIZE 29 /* unaligned */ struct bgp_opt { - uint8_t bgpopt_type; - uint8_t bgpopt_len; - /* variable length */ + nd_uint8_t bgpopt_type; + nd_uint8_t bgpopt_len; + /* variable length */ }; -#define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */ -#define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */ +#define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */ +#define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */ struct bgp_notification { - uint8_t bgpn_marker[16]; - uint16_t bgpn_len; - uint8_t bgpn_type; - uint8_t bgpn_major; - uint8_t bgpn_minor; + nd_byte bgpn_marker[16]; + nd_uint16_t bgpn_len; + nd_uint8_t bgpn_type; + nd_uint8_t bgpn_major; + nd_uint8_t bgpn_minor; }; -#define BGP_NOTIFICATION_SIZE 21 /* unaligned */ +#define BGP_NOTIFICATION_SIZE 21 /* unaligned */ struct bgp_route_refresh { - uint8_t bgp_marker[16]; - uint16_t len; - uint8_t type; - uint8_t afi[2]; /* the compiler messes this structure up */ - uint8_t res; /* when doing misaligned sequences of int8 and int16 */ - uint8_t safi; /* afi should be int16 - so we have to access it using */ -}; /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh) */ + nd_byte bgp_marker[16]; + nd_uint16_t len; + nd_uint8_t type; /* No padding after this; afi is, in fact, not aligned */ + nd_uint16_t afi; + nd_uint8_t res; + nd_uint8_t safi; +}; #define BGP_ROUTE_REFRESH_SIZE 23 #define bgp_attr_lenlen(flags, p) \ - (((flags) & 0x10) ? 2 : 1) + (((flags) & 0x10) ? 2U : 1U) #define bgp_attr_len(flags, p) \ - (((flags) & 0x10) ? EXTRACT_16BITS(p) : *(p)) - -#define BGPTYPE_ORIGIN 1 -#define BGPTYPE_AS_PATH 2 -#define BGPTYPE_NEXT_HOP 3 -#define BGPTYPE_MULTI_EXIT_DISC 4 -#define BGPTYPE_LOCAL_PREF 5 -#define BGPTYPE_ATOMIC_AGGREGATE 6 -#define BGPTYPE_AGGREGATOR 7 -#define BGPTYPE_COMMUNITIES 8 /* RFC1997 */ -#define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */ -#define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */ -#define BGPTYPE_DPA 11 /* deprecated, draft-ietf-idr-bgp-dpa */ -#define BGPTYPE_ADVERTISERS 12 /* deprecated RFC1863 */ -#define BGPTYPE_RCID_PATH 13 /* deprecated RFC1863 */ -#define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */ -#define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */ -#define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */ -#define BGPTYPE_AS4_PATH 17 /* RFC6793 */ -#define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */ -#define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */ -#define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */ -#define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */ -#define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */ -#define BGPTYPE_AIGP 26 /* RFC7311 */ -#define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */ -#define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */ -#define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */ -#define BGPTYPE_ATTR_SET 128 /* RFC6368 */ - -#define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */ + (((flags) & 0x10) ? GET_BE_U_2(p) : GET_U_1(p)) + +#define BGPTYPE_ORIGIN 1 +#define BGPTYPE_AS_PATH 2 +#define BGPTYPE_NEXT_HOP 3 +#define BGPTYPE_MULTI_EXIT_DISC 4 +#define BGPTYPE_LOCAL_PREF 5 +#define BGPTYPE_ATOMIC_AGGREGATE 6 +#define BGPTYPE_AGGREGATOR 7 +#define BGPTYPE_COMMUNITIES 8 /* RFC1997 */ +#define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */ +#define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */ +#define BGPTYPE_DPA 11 /* deprecated, draft-ietf-idr-bgp-dpa */ +#define BGPTYPE_ADVERTISERS 12 /* deprecated RFC1863 */ +#define BGPTYPE_RCID_PATH 13 /* deprecated RFC1863 */ +#define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */ +#define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */ +#define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */ +#define BGPTYPE_AS4_PATH 17 /* RFC6793 */ +#define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */ +#define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */ +#define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */ +#define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */ +#define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */ +#define BGPTYPE_AIGP 26 /* RFC7311 */ +#define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */ +#define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */ +#define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */ +#define BGPTYPE_ATTR_SET 128 /* RFC6368 */ + +#define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */ static const struct tok bgp_attr_values[] = { { BGPTYPE_ORIGIN, "Origin"}, @@ -214,12 +216,14 @@ static const struct tok bgp_opt_values[] = { #define BGP_CAPCODE_ORF 3 /* RFC5291 */ #define BGP_CAPCODE_MR 4 /* RFC3107 */ #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */ +#define BGP_CAPCODE_ML 8 /* RFC8277 */ #define BGP_CAPCODE_RESTART 64 /* RFC4724 */ #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */ #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */ #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */ #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */ #define BGP_CAPCODE_ENH_RR 70 /* draft-keyur-bgp-enhanced-route-refresh */ +#define BGP_CAPCODE_LLGR 71 /* draft-uttaro-idr-bgp-persistence-05 */ #define BGP_CAPCODE_RR_CISCO 128 static const struct tok bgp_capcode_values[] = { @@ -228,12 +232,14 @@ static const struct tok bgp_capcode_values[] = { { BGP_CAPCODE_ORF, "Cooperative Route Filtering"}, { BGP_CAPCODE_MR, "Multiple Routes to a Destination"}, { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"}, + { BGP_CAPCODE_ML, "Multiple Labels"}, { BGP_CAPCODE_RESTART, "Graceful Restart"}, { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"}, { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"}, { BGP_CAPCODE_MULTISESS, "Multisession BGP"}, { BGP_CAPCODE_ADD_PATH, "Multiple Paths"}, { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"}, + { BGP_CAPCODE_LLGR, "Long-lived Graceful Restart"}, { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"}, { 0, NULL} }; @@ -376,6 +382,8 @@ static const struct tok bgp_aigp_values[] = { #define SAFNUM_VPLS 65 /* RFC6037 */ #define SAFNUM_MDT 66 +/* RFC7432 */ +#define SAFNUM_EVPN 70 /* RFC4364 */ #define SAFNUM_VPNUNICAST 128 /* RFC6513 */ @@ -395,6 +403,7 @@ static const struct tok bgp_safi_values[] = { { SAFNUM_TUNNEL, "Tunnel"}, { SAFNUM_VPLS, "VPLS"}, { SAFNUM_MDT, "MDT"}, + { SAFNUM_EVPN, "EVPN"}, { SAFNUM_VPNUNICAST, "labeled VPN Unicast"}, { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"}, { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"}, @@ -404,11 +413,11 @@ static const struct tok bgp_safi_values[] = { }; /* well-known community */ -#define BGP_COMMUNITY_NO_EXPORT 0xffffff01 -#define BGP_COMMUNITY_NO_ADVERT 0xffffff02 -#define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03 +#define BGP_COMMUNITY_NO_EXPORT 0xffffff01 +#define BGP_COMMUNITY_NO_ADVERT 0xffffff02 +#define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03 -/* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */ +/* Extended community type - RFC 4360 */ #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) */ @@ -418,15 +427,16 @@ static const struct tok bgp_safi_values[] = { #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_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatibility */ +#define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatibility */ +#define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatibility */ #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_RTYPE2 0x8000 /* duplicate - keep for backwards compatibility */ +#define BGP_EXT_COM_ENCAP 0x030c /* rfc5512 */ #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_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatibility */ #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */ @@ -435,12 +445,12 @@ static const struct tok bgp_safi_values[] = { #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */ #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */ -/* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */ -#define BGP_EXT_COM_EIGRP_GEN 0x8800 -#define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801 -#define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802 -#define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803 -#define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804 +/* https://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */ +#define BGP_EXT_COM_EIGRP_GEN 0x8800 +#define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801 +#define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802 +#define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803 +#define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805 static const struct tok bgp_extd_comm_flag_values[] = { @@ -463,15 +473,16 @@ static const struct tok bgp_extd_comm_subtype_values[] = { { 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_ENCAP, "encapsulation"}, { BGP_EXT_COM_OSPF_RID, "ospf-router-id"}, { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"}, { BGP_EXT_COM_L2INFO, "layer2-info"}, - { BGP_EXT_COM_EIGRP_GEN , "eigrp-general-route (flag, tag)" }, - { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY , "eigrp-route-metric (AS, delay)" }, - { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW , "eigrp-route-metric (reliability, nexthop, bandwidth)" }, - { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU , "eigrp-route-metric (load, MTU)" }, - { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID , "eigrp-external-route (remote-AS, remote-ID)" }, - { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC , "eigrp-external-route (remote-proto, remote-metric)" }, + { BGP_EXT_COM_EIGRP_GEN, "eigrp-general-route (flag, tag)" }, + { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY, "eigrp-route-metric (AS, delay)" }, + { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW, "eigrp-route-metric (reliability, nexthop, bandwidth)" }, + { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU, "eigrp-route-metric (load, MTU)" }, + { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID, "eigrp-external-route (remote-AS, remote-ID)" }, + { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC, "eigrp-external-route (remote-proto, remote-metric)" }, { BGP_EXT_COM_SOURCE_AS, "source-AS" }, { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"}, { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"}, @@ -479,6 +490,46 @@ static const struct tok bgp_extd_comm_subtype_values[] = { { 0, NULL}, }; +/* RFC RFC5512 BGP Tunnel Encapsulation Attribute Tunnel Types */ +#define BGP_ENCAP_TUNNEL_L2TPV3_IP 1 +#define BGP_ENCAP_TUNNEL_GRE 2 +#define BGP_ENCAP_TUNNEL_TRANSMIT 3 +#define BGP_ENCAP_TUNNEL_IPSEC 4 +#define BGP_ENCAP_TUNNEL_IP_IPSEC 5 +#define BGP_ENCAP_TUNNEL_MPLS_IP 6 +#define BGP_ENCAP_TUNNEL_IP_IP 7 +#define BGP_ENCAP_TUNNEL_VXLAN 8 +#define BGP_ENCAP_TUNNEL_NVGRE 9 +#define BGP_ENCAP_TUNNEL_MPLS 10 +#define BGP_ENCAP_TUNNEL_MPLS_GRE 11 +#define BGP_ENCAP_TUNNEL_VXLAN_GPE 12 +#define BGP_ENCAP_TUNNEL_MPLS_UDP 13 +#define BGP_ENCAP_TUNNEL_IPV6 14 +#define BGP_ENCAP_TUNNEL_SR_TE 15 +#define BGP_ENCAP_TUNNEL_BARE 16 +#define BGP_ENCAP_TUNNEL_SR 17 + +static const struct tok bgp_extd_comm_encap_tunnel_values[] = { + { BGP_ENCAP_TUNNEL_L2TPV3_IP, "L2TPv3 over IP"}, + { BGP_ENCAP_TUNNEL_GRE, "GRE"}, + { BGP_ENCAP_TUNNEL_TRANSMIT, "Transmit Tunnel"}, + { BGP_ENCAP_TUNNEL_IPSEC, "IPsec"}, + { BGP_ENCAP_TUNNEL_IP_IPSEC, "IP in IP with IPsec"}, + { BGP_ENCAP_TUNNEL_MPLS_IP, "MPLS in IP with IPsec"}, + { BGP_ENCAP_TUNNEL_IP_IP, "IP in IP"}, + { BGP_ENCAP_TUNNEL_VXLAN, "VXLAN"}, + { BGP_ENCAP_TUNNEL_NVGRE, "NVGRE"}, + { BGP_ENCAP_TUNNEL_MPLS, "MPLS"}, + { BGP_ENCAP_TUNNEL_MPLS_GRE, "MPLS in GRE"}, + { BGP_ENCAP_TUNNEL_VXLAN_GPE, "VXLAN GPE"}, + { BGP_ENCAP_TUNNEL_MPLS_UDP, "MPLS in UDP"}, + { BGP_ENCAP_TUNNEL_IPV6, "IPv6"}, + { BGP_ENCAP_TUNNEL_SR_TE, "SR TE"}, + { BGP_ENCAP_TUNNEL_BARE, "Bare"}, + { BGP_ENCAP_TUNNEL_SR, "SR"}, + { 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 */ @@ -500,10 +551,10 @@ static const struct tok bgp_extd_comm_ospf_rtype_values[] = { /* ADD-PATH Send/Receive field values */ static const struct tok bgp_add_path_recvsend[] = { - { 1, "Receive" }, - { 2, "Send" }, - { 3, "Both" }, - { 0, NULL }, + { 1, "Receive" }, + { 2, "Send" }, + { 3, "Both" }, + { 0, NULL }, }; static char astostr[20]; @@ -519,103 +570,102 @@ static char astostr[20]; */ static char * as_printf(netdissect_options *ndo, - char *str, int size, u_int asnum) + char *str, size_t size, u_int asnum) { - if (!ndo->ndo_bflag || asnum <= 0xFFFF) { - snprintf(str, size, "%u", asnum); - } else { - snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF); - } - return str; + if (!ndo->ndo_bflag || asnum <= 0xFFFF) { + snprintf(str, size, "%u", asnum); + } else { + snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF); + } + return str; } #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv; int decode_prefix4(netdissect_options *ndo, - const u_char *pptr, u_int itemlen, char *buf, u_int buflen) + const u_char *pptr, u_int itemlen, char *buf, size_t buflen) { - struct in_addr addr; - u_int plen, plenbytes; - - ND_TCHECK(pptr[0]); - ITEMCHECK(1); - plen = pptr[0]; - if (32 < plen) - return -1; - itemlen -= 1; - - memset(&addr, 0, sizeof(addr)); - plenbytes = (plen + 7) / 8; - ND_TCHECK2(pptr[1], plenbytes); - ITEMCHECK(plenbytes); - memcpy(&addr, &pptr[1], plenbytes); - if (plen % 8) { - ((u_char *)&addr)[plenbytes - 1] &= - ((0xff00 >> (plen % 8)) & 0xff); - } - snprintf(buf, buflen, "%s/%d", ipaddr_string(ndo, &addr), plen); - return 1 + plenbytes; + nd_ipv4 addr; + u_int plen, plenbytes; + + ND_TCHECK_1(pptr); + ITEMCHECK(1); + plen = GET_U_1(pptr); + if (32 < plen) + return -1; + itemlen -= 1; + + memset(&addr, 0, sizeof(addr)); + plenbytes = (plen + 7) / 8; + ND_TCHECK_LEN(pptr + 1, plenbytes); + ITEMCHECK(plenbytes); + memcpy(&addr, pptr + 1, plenbytes); + if (plen % 8) { + ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff); + } + snprintf(buf, buflen, "%s/%u", ipaddr_string(ndo, (const u_char *)&addr), plen); + return 1 + plenbytes; trunc: - return -2; + return -2; badtlv: - return -3; + return -3; } static int decode_labeled_prefix4(netdissect_options *ndo, - const u_char *pptr, u_int itemlen, char *buf, u_int buflen) + const u_char *pptr, u_int itemlen, char *buf, + size_t buflen) { - struct in_addr addr; - u_int plen, plenbytes; - - /* prefix length and label = 4 bytes */ - ND_TCHECK2(pptr[0], 4); - ITEMCHECK(4); - plen = pptr[0]; /* get prefix length */ - - /* this is one of the weirdnesses of rfc3107 - the label length (actually the label + COS bits) - is added to the prefix length; - we also do only read out just one label - - there is no real application for advertisement of - stacked labels in a single BGP message - */ - - if (24 > plen) - return -1; - - plen-=24; /* adjust prefixlen - labellength */ - - if (32 < plen) - return -1; - itemlen -= 4; - - memset(&addr, 0, sizeof(addr)); - plenbytes = (plen + 7) / 8; - ND_TCHECK2(pptr[4], plenbytes); - ITEMCHECK(plenbytes); - memcpy(&addr, &pptr[4], plenbytes); - if (plen % 8) { - ((u_char *)&addr)[plenbytes - 1] &= - ((0xff00 >> (plen % 8)) & 0xff); - } - /* the label may get offsetted by 4 bits so lets shift it right */ - snprintf(buf, buflen, "%s/%d, label:%u %s", - ipaddr_string(ndo, &addr), - plen, - EXTRACT_24BITS(pptr+1)>>4, - ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); + nd_ipv4 addr; + u_int plen, plenbytes; + + /* prefix length and label = 4 bytes */ + ND_TCHECK_4(pptr); + ITEMCHECK(4); + plen = GET_U_1(pptr); /* get prefix length */ + + /* this is one of the weirdnesses of rfc3107 + the label length (actually the label + COS bits) + is added to the prefix length; + we also do only read out just one label - + there is no real application for advertisement of + stacked labels in a single BGP message + */ + + if (24 > plen) + return -1; + + plen-=24; /* adjust prefixlen - labellength */ + + if (32 < plen) + return -1; + itemlen -= 4; + + memset(&addr, 0, sizeof(addr)); + plenbytes = (plen + 7) / 8; + ND_TCHECK_LEN(pptr + 4, plenbytes); + ITEMCHECK(plenbytes); + memcpy(&addr, pptr + 4, plenbytes); + if (plen % 8) { + ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff); + } + /* the label may get offsetted by 4 bits so lets shift it right */ + snprintf(buf, buflen, "%s/%u, label:%u %s", + ipaddr_string(ndo, (const u_char *)&addr), + plen, + GET_BE_U_3(pptr + 1)>>4, + ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); - return 4 + plenbytes; + return 4 + plenbytes; trunc: - return -2; + return -2; badtlv: - return -3; + return -3; } /* @@ -633,12 +683,12 @@ bgp_vpn_ip_print(netdissect_options *ndo, char *pos = addr; switch(addr_length) { - case (sizeof(struct in_addr) << 3): /* 32 */ - ND_TCHECK2(pptr[0], sizeof(struct in_addr)); + case (sizeof(nd_ipv4) << 3): /* 32 */ + ND_TCHECK_LEN(pptr, sizeof(nd_ipv4)); snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr)); break; - case (sizeof(struct in6_addr) << 3): /* 128 */ - ND_TCHECK2(pptr[0], sizeof(struct in6_addr)); + case (sizeof(nd_ipv6) << 3): /* 128 */ + ND_TCHECK_LEN(pptr, sizeof(nd_ipv6)); snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr)); break; default: @@ -670,9 +720,9 @@ trunc: * * return the number of bytes read from the wire. */ -static int +static u_int bgp_vpn_sg_print(netdissect_options *ndo, - const u_char *pptr, char *buf, u_int buflen) + const u_char *pptr, char *buf, size_t buflen) { uint8_t addr_length; u_int total_length, offset; @@ -680,30 +730,32 @@ bgp_vpn_sg_print(netdissect_options *ndo, total_length = 0; /* Source address length, encoded in bits */ - ND_TCHECK2(pptr[0], 1); - addr_length = *pptr++; + ND_TCHECK_1(pptr); + addr_length = GET_U_1(pptr); + pptr++; /* Source address */ - ND_TCHECK2(pptr[0], (addr_length >> 3)); + ND_TCHECK_LEN(pptr, (addr_length >> 3)); total_length += (addr_length >> 3) + 1; - offset = strlen(buf); + offset = (u_int)strlen(buf); if (addr_length) { snprintf(buf + offset, buflen - offset, ", Source %s", - bgp_vpn_ip_print(ndo, pptr, addr_length)); + bgp_vpn_ip_print(ndo, pptr, addr_length)); pptr += (addr_length >> 3); } /* Group address length, encoded in bits */ - ND_TCHECK2(pptr[0], 1); - addr_length = *pptr++; + ND_TCHECK_1(pptr); + addr_length = GET_U_1(pptr); + pptr++; /* Group address */ - ND_TCHECK2(pptr[0], (addr_length >> 3)); + ND_TCHECK_LEN(pptr, (addr_length >> 3)); total_length += (addr_length >> 3) + 1; - offset = strlen(buf); + offset = (u_int)strlen(buf); if (addr_length) { snprintf(buf + offset, buflen - offset, ", Group %s", - bgp_vpn_ip_print(ndo, pptr, addr_length)); + bgp_vpn_ip_print(ndo, pptr, addr_length)); pptr += (addr_length >> 3); } @@ -711,40 +763,42 @@ trunc: return (total_length); } -/* RDs and RTs share the same semantics - * we use bgp_vpn_rd_print for - * printing route targets inside a NLRI */ -char * +/* Print an RFC 4364 Route Distinguisher */ +const char * bgp_vpn_rd_print(netdissect_options *ndo, const u_char *pptr) { - /* allocate space for the largest possible string */ + /* allocate space for the largest possible string */ static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")]; char *pos = rd; /* ok lets load the RD format */ - switch (EXTRACT_16BITS(pptr)) { + switch (GET_BE_U_2(pptr)) { - /* 2-byte-AS:number fmt*/ case 0: + /* 2-byte-AS:number fmt */ snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)", - EXTRACT_16BITS(pptr+2), - EXTRACT_32BITS(pptr+4), - *(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7)); + GET_BE_U_2(pptr + 2), + GET_BE_U_4(pptr + 4), + GET_U_1(pptr + 4), GET_U_1(pptr + 5), + GET_U_1(pptr + 6), GET_U_1(pptr + 7)); break; - /* IP-address:AS fmt*/ case 1: + /* IP-address:AS fmt */ snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u", - *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6)); + GET_U_1(pptr + 2), GET_U_1(pptr + 3), + GET_U_1(pptr + 4), GET_U_1(pptr + 5), + GET_BE_U_2(pptr + 6)); break; - /* 4-byte-AS:number fmt*/ case 2: - snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)", - as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+2)), - EXTRACT_16BITS(pptr+6), *(pptr+2), *(pptr+3), *(pptr+4), - *(pptr+5), EXTRACT_16BITS(pptr+6)); + /* 4-byte-AS:number fmt */ + snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)", + as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 2)), + GET_BE_U_2(pptr + 6), GET_U_1(pptr + 2), + GET_U_1(pptr + 3), GET_U_1(pptr + 4), + GET_U_1(pptr + 5), GET_BE_U_2(pptr + 6)); break; default: snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format"); @@ -755,83 +809,189 @@ bgp_vpn_rd_print(netdissect_options *ndo, return (rd); } +/* + * Print an RFC 4360 Extended Community. + */ +static void +bgp_extended_community_print(netdissect_options *ndo, + const u_char *pptr) +{ + union { /* copy buffer for bandwidth values */ + float f; + uint32_t i; + } bw; + + switch (GET_BE_U_2(pptr)) { + + case BGP_EXT_COM_RT_0: + case BGP_EXT_COM_RO_0: + case BGP_EXT_COM_L2VPN_RT_0: + ND_PRINT("%u:%u (= %s)", + GET_BE_U_2(pptr + 2), + GET_BE_U_4(pptr + 4), + ipaddr_string(ndo, pptr+4)); + break; + + case BGP_EXT_COM_RT_1: + case BGP_EXT_COM_RO_1: + case BGP_EXT_COM_L2VPN_RT_1: + case BGP_EXT_COM_VRF_RT_IMP: + ND_PRINT("%s:%u", + ipaddr_string(ndo, pptr+2), + GET_BE_U_2(pptr + 6)); + break; + + case BGP_EXT_COM_RT_2: + case BGP_EXT_COM_RO_2: + ND_PRINT("%s:%u", + as_printf(ndo, astostr, sizeof(astostr), + GET_BE_U_4(pptr + 2)), GET_BE_U_2(pptr + 6)); + break; + + case BGP_EXT_COM_LINKBAND: + bw.i = GET_BE_U_4(pptr + 2); + ND_PRINT("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: + ND_PRINT("%s", ipaddr_string(ndo, pptr+2)); + break; + + case BGP_EXT_COM_OSPF_RTYPE: + case BGP_EXT_COM_OSPF_RTYPE2: + ND_PRINT("area:%s, router-type:%s, metric-type:%s%s", + ipaddr_string(ndo, pptr+2), + tok2str(bgp_extd_comm_ospf_rtype_values, + "unknown (0x%02x)", + GET_U_1((pptr + 6))), + (GET_U_1(pptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "", + ((GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_EXT) || (GET_U_1(pptr + 6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""); + break; + + case BGP_EXT_COM_L2INFO: + ND_PRINT("%s Control Flags [0x%02x]:MTU %u", + tok2str(l2vpn_encaps_values, + "unknown encaps", + GET_U_1((pptr + 2))), + GET_U_1((pptr + 3)), + GET_BE_U_2(pptr + 4)); + break; + + case BGP_EXT_COM_SOURCE_AS: + ND_PRINT("AS %u", GET_BE_U_2(pptr + 2)); + break; + + case BGP_EXT_COM_ENCAP: + ND_PRINT("Tunnel type: %s", tok2str(bgp_extd_comm_encap_tunnel_values, + "unknown encaps", + GET_BE_U_2(pptr + 6))); + break; + + default: + ND_PRINT("%02x%02x%02x%02x%02x%02x", + GET_U_1(pptr + 2), + GET_U_1(pptr + 3), + GET_U_1(pptr + 4), + GET_U_1(pptr + 5), + GET_U_1(pptr + 6), + GET_U_1(pptr + 7)); + break; + } +} + +/* RFC 4684 */ static int decode_rt_routing_info(netdissect_options *ndo, - const u_char *pptr, char *buf, u_int buflen) + const u_char *pptr) { - uint8_t route_target[8]; - u_int plen; + u_int plen; + char asbuf[sizeof(astostr)]; /* bgp_vpn_rd_print() overwrites astostr */ - ND_TCHECK(pptr[0]); - plen = pptr[0]; /* get prefix length */ + /* NLRI "prefix length" from RFC 2858 Section 4. */ + ND_TCHECK_1(pptr); + plen = GET_U_1(pptr); /* get prefix length */ - if (0 == plen) { - snprintf(buf, buflen, "default route target"); - return 1; - } + /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits. + * RFC 4684 Section 4 defines the layout of "origin AS" and "route + * target" fields inside the "prefix" depending on its length. + */ + if (0 == plen) { + /* Without "origin AS", without "route target". */ + ND_PRINT("\n\t default route target"); + return 1; + } - if (32 > plen) - return -1; + if (32 > plen) { + ND_PRINT("\n\t (illegal prefix length)"); + return -1; + } - plen-=32; /* adjust prefix length */ + /* With at least "origin AS", possibly with "route target". */ + ND_TCHECK_4(pptr + 1); + as_printf(ndo, asbuf, sizeof(asbuf), GET_BE_U_4(pptr + 1)); - if (64 < plen) - return -1; + plen -= 32; /* adjust prefix length */ - memset(&route_target, 0, sizeof(route_target)); - ND_TCHECK2(pptr[1], (plen + 7) / 8); - memcpy(&route_target, &pptr[1], (plen + 7) / 8); - if (plen % 8) { - ((u_char *)&route_target)[(plen + 7) / 8 - 1] &= - ((0xff00 >> (plen % 8)) & 0xff); - } - snprintf(buf, buflen, "origin AS: %s, route target %s", - as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+1)), - bgp_vpn_rd_print(ndo, (u_char *)&route_target)); + /* An extended community is 8 octets, so the remaining prefix + * length must be 64. + */ + if (64 != plen) { + ND_PRINT("\n\t (illegal prefix length)"); + return -1; + } + ND_TCHECK_LEN(pptr + 5, 8); + ND_PRINT("\n\t origin AS: %s, route target ", asbuf); + bgp_extended_community_print(ndo, pptr + 5); - return 5 + (plen + 7) / 8; + return 5 + 8; trunc: - return -2; + return -2; } static int decode_labeled_vpn_prefix4(netdissect_options *ndo, - const u_char *pptr, char *buf, u_int buflen) + const u_char *pptr, char *buf, size_t buflen) { - struct in_addr addr; - u_int plen; + nd_ipv4 addr; + u_int plen; - ND_TCHECK(pptr[0]); - plen = pptr[0]; /* get prefix length */ + ND_TCHECK_1(pptr); + plen = GET_U_1(pptr); /* get prefix length */ - if ((24+64) > plen) - return -1; + if ((24+64) > plen) + return -1; - plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ + plen -= (24+64); /* adjust prefixlen - labellength - RD len*/ - if (32 < plen) - return -1; + if (32 < plen) + return -1; - memset(&addr, 0, sizeof(addr)); - ND_TCHECK2(pptr[12], (plen + 7) / 8); - memcpy(&addr, &pptr[12], (plen + 7) / 8); - if (plen % 8) { - ((u_char *)&addr)[(plen + 7) / 8 - 1] &= - ((0xff00 >> (plen % 8)) & 0xff); - } - /* the label may get offsetted by 4 bits so lets shift it right */ - snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", - bgp_vpn_rd_print(ndo, pptr+4), - ipaddr_string(ndo, &addr), - plen, - EXTRACT_24BITS(pptr+1)>>4, - ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); + memset(&addr, 0, sizeof(addr)); + ND_TCHECK_LEN(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/%u, label:%u %s", + bgp_vpn_rd_print(ndo, pptr+4), + ipaddr_string(ndo, (const u_char *)&addr), + plen, + GET_BE_U_3(pptr + 1)>>4, + ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); - return 12 + (plen + 7) / 8; + return 12 + (plen + 7) / 8; trunc: - return -2; + return -2; } /* @@ -848,40 +1008,38 @@ trunc: static int decode_mdt_vpn_nlri(netdissect_options *ndo, - const u_char *pptr, char *buf, u_int buflen) + const u_char *pptr, char *buf, size_t buflen) { - const u_char *rd; const u_char *vpn_ip; - ND_TCHECK(pptr[0]); + ND_TCHECK_1(pptr); /* if the NLRI is not predefined length, quit.*/ - if (*pptr != MDT_VPN_NLRI_LEN * 8) - return -1; + if (GET_U_1(pptr) != MDT_VPN_NLRI_LEN * 8) + return -1; pptr++; /* RD */ - ND_TCHECK2(pptr[0], 8); + ND_TCHECK_8(pptr); rd = pptr; - pptr+=8; + pptr += 8; /* IPv4 address */ - ND_TCHECK2(pptr[0], sizeof(struct in_addr)); + ND_TCHECK_LEN(pptr, sizeof(nd_ipv4)); vpn_ip = pptr; - pptr+=sizeof(struct in_addr); + pptr += sizeof(nd_ipv4); /* MDT Group Address */ - ND_TCHECK2(pptr[0], sizeof(struct in_addr)); + ND_TCHECK_LEN(pptr, sizeof(nd_ipv4)); snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s", - bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr)); + bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr)); return MDT_VPN_NLRI_LEN + 1; trunc: - -return -2; + return -2; } #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1 @@ -900,93 +1058,97 @@ static const struct tok bgp_multicast_vpn_route_type_values[] = { { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"}, { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"}, { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"}, + { 0, NULL} }; static int decode_multicast_vpn(netdissect_options *ndo, - const u_char *pptr, char *buf, u_int buflen) + const u_char *pptr, char *buf, size_t buflen) { - uint8_t route_type, route_length, addr_length, sg_length; - u_int offset; - - ND_TCHECK2(pptr[0], 2); - route_type = *pptr++; - route_length = *pptr++; - - snprintf(buf, buflen, "Route-Type: %s (%u), length: %u", - tok2str(bgp_multicast_vpn_route_type_values, - "Unknown", route_type), - route_type, route_length); - - switch(route_type) { - case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI: - ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); - offset = strlen(buf); - snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s", - bgp_vpn_rd_print(ndo, pptr), - bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN, - (route_length - BGP_VPN_RD_LEN) << 3)); - break; - case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI: - ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4); - offset = strlen(buf); - snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", - bgp_vpn_rd_print(ndo, pptr), - as_printf(ndo, astostr, sizeof(astostr), - EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); - break; + uint8_t route_type, route_length; + u_int addr_length, sg_length; + u_int offset; - case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI: - ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); - offset = strlen(buf); - snprintf(buf + offset, buflen - offset, ", RD: %s", - bgp_vpn_rd_print(ndo, pptr)); - pptr += BGP_VPN_RD_LEN; + ND_TCHECK_2(pptr); + route_type = GET_U_1(pptr); + pptr++; + route_length = GET_U_1(pptr); + pptr++; - sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen); - addr_length = route_length - sg_length; + snprintf(buf, buflen, "Route-Type: %s (%u), length: %u", + tok2str(bgp_multicast_vpn_route_type_values, + "Unknown", route_type), + route_type, route_length); + + switch(route_type) { + case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI: + ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN); + offset = (u_int)strlen(buf); + snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s", + bgp_vpn_rd_print(ndo, pptr), + bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN, + (route_length - BGP_VPN_RD_LEN) << 3)); + break; + case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI: + ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4); + offset = (u_int)strlen(buf); + snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", + bgp_vpn_rd_print(ndo, pptr), + as_printf(ndo, astostr, sizeof(astostr), + GET_BE_U_4(pptr + BGP_VPN_RD_LEN))); + break; - ND_TCHECK2(pptr[0], addr_length); - offset = strlen(buf); - snprintf(buf + offset, buflen - offset, ", Originator %s", - bgp_vpn_ip_print(ndo, pptr, addr_length << 3)); - break; + case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI: + ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN); + offset = (u_int)strlen(buf); + snprintf(buf + offset, buflen - offset, ", RD: %s", + bgp_vpn_rd_print(ndo, pptr)); + pptr += BGP_VPN_RD_LEN; - case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE: - ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); - offset = strlen(buf); - snprintf(buf + offset, buflen - offset, ", RD: %s", - bgp_vpn_rd_print(ndo, pptr)); - pptr += BGP_VPN_RD_LEN; + sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen); + addr_length = route_length - sg_length; - bgp_vpn_sg_print(ndo, pptr, buf, buflen); - break; + ND_TCHECK_LEN(pptr, addr_length); + offset = (u_int)strlen(buf); + snprintf(buf + offset, buflen - offset, ", Originator %s", + bgp_vpn_ip_print(ndo, pptr, addr_length << 3)); + break; - case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */ - case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN: - ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); - offset = strlen(buf); - snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", - bgp_vpn_rd_print(ndo, pptr), - as_printf(ndo, astostr, sizeof(astostr), - EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); - pptr += BGP_VPN_RD_LEN; - - bgp_vpn_sg_print(ndo, pptr, buf, buflen); - break; + case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE: + ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN); + offset = (u_int)strlen(buf); + snprintf(buf + offset, buflen - offset, ", RD: %s", + bgp_vpn_rd_print(ndo, pptr)); + pptr += BGP_VPN_RD_LEN; - /* - * no per route-type printing yet. - */ - case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF: - default: - break; - } + bgp_vpn_sg_print(ndo, pptr, buf, buflen); + break; - return route_length + 2; + case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */ + case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN: + ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN + 4); + offset = (u_int)strlen(buf); + snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", + bgp_vpn_rd_print(ndo, pptr), + as_printf(ndo, astostr, sizeof(astostr), + GET_BE_U_4(pptr + BGP_VPN_RD_LEN))); + pptr += BGP_VPN_RD_LEN + 4; + + bgp_vpn_sg_print(ndo, pptr, buf, buflen); + break; + + /* + * no per route-type printing yet. + */ + case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF: + default: + break; + } + + return route_length + 2; trunc: - return -2; + return -2; } /* @@ -1001,290 +1163,310 @@ trunc: */ #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \ if (stringlen<0) \ - buflen=0; \ + buflen=0; \ else if ((u_int)stringlen>buflen) \ buflen=0; \ else { \ buflen-=stringlen; \ - buf+=stringlen; \ + buf+=stringlen; \ } static int decode_labeled_vpn_l2(netdissect_options *ndo, - const u_char *pptr, char *buf, u_int buflen) + const u_char *pptr, char *buf, size_t buflen) { - int plen,tlen,stringlen,tlv_type,tlv_len,ttlv_len; - - ND_TCHECK2(pptr[0], 2); - plen=EXTRACT_16BITS(pptr); - tlen=plen; - pptr+=2; - /* Old and new L2VPN NLRI share AFI/SAFI - * -> Assume a 12 Byte-length NLRI is auto-discovery-only - * and > 17 as old format. Complain for the middle case - */ - if (plen==12) { - /* assume AD-only with RD, BGPNH */ - ND_TCHECK2(pptr[0],12); - buf[0]='\0'; - stringlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s", - bgp_vpn_rd_print(ndo, pptr), - ipaddr_string(ndo, pptr+8) - ); - UPDATE_BUF_BUFLEN(buf, buflen, stringlen); - pptr+=12; - tlen-=12; - return plen; - } else if (plen>17) { - /* assume old format */ - /* RD, ID, LBLKOFF, LBLBASE */ - - ND_TCHECK2(pptr[0],15); - buf[0]='\0'; - stringlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u", - bgp_vpn_rd_print(ndo, pptr), - EXTRACT_16BITS(pptr+8), - EXTRACT_16BITS(pptr+10), - EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */ - UPDATE_BUF_BUFLEN(buf, buflen, stringlen); - pptr+=15; - tlen-=15; - - /* ok now the variable part - lets read out TLVs*/ - while (tlen>0) { - if (tlen < 3) - return -1; - ND_TCHECK2(pptr[0], 3); - tlv_type=*pptr++; - tlv_len=EXTRACT_16BITS(pptr); - ttlv_len=tlv_len; - pptr+=2; - - switch(tlv_type) { - case 1: - if (buflen!=0) { - stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x", - tlv_type, - tlv_len); - UPDATE_BUF_BUFLEN(buf, buflen, stringlen); - } - ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */ - while (ttlv_len>0) { - ND_TCHECK(pptr[0]); - if (buflen!=0) { - stringlen=snprintf(buf,buflen, "%02x",*pptr++); - UPDATE_BUF_BUFLEN(buf, buflen, stringlen); - } - ttlv_len--; - } - break; - default: - if (buflen!=0) { - stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u", - tlv_type, - tlv_len); - UPDATE_BUF_BUFLEN(buf, buflen, stringlen); - } - break; - } - tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */ - } - return plen+2; - - } else { - /* complain bitterly ? */ - /* fall through */ - goto trunc; + u_int plen, tlen, tlv_type, tlv_len, ttlv_len; + int stringlen; + + ND_TCHECK_2(pptr); + plen = GET_BE_U_2(pptr); + tlen = plen; + pptr += 2; + /* Old and new L2VPN NLRI share AFI/SAFI + * -> Assume a 12 Byte-length NLRI is auto-discovery-only + * and > 17 as old format. Complain for the middle case + */ + if (plen == 12) { + /* assume AD-only with RD, BGPNH */ + ND_TCHECK_LEN(pptr, 12); + buf[0] = '\0'; + stringlen = snprintf(buf, buflen, "RD: %s, BGPNH: %s", + bgp_vpn_rd_print(ndo, pptr), + ipaddr_string(ndo, pptr+8)); + UPDATE_BUF_BUFLEN(buf, buflen, stringlen); + pptr += 12; + tlen -= 12; + return plen + 2; + } else if (plen > 17) { + /* assume old format */ + /* RD, ID, LBLKOFF, LBLBASE */ + + ND_TCHECK_LEN(pptr, 15); + buf[0] = '\0'; + stringlen = snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u", + bgp_vpn_rd_print(ndo, pptr), + GET_BE_U_2(pptr + 8), + GET_BE_U_2(pptr + 10), + GET_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */ + UPDATE_BUF_BUFLEN(buf, buflen, stringlen); + pptr += 15; + tlen -= 15; + + /* ok now the variable part - lets read out TLVs*/ + while (tlen != 0) { + if (tlen < 3) { + if (buflen != 0) { + stringlen=snprintf(buf,buflen, "\n\t\tran past the end"); + UPDATE_BUF_BUFLEN(buf, buflen, stringlen); + } + return plen + 2; + } + ND_TCHECK_3(pptr); + tlv_type = GET_U_1(pptr); + pptr++; + tlv_len = GET_BE_U_2(pptr); /* length, in *bits* */ + ttlv_len = (tlv_len + 7)/8; /* length, in *bytes* */ + pptr += 2; + + switch(tlv_type) { + case 1: + if (buflen != 0) { + stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x", + tlv_type, + tlv_len); + UPDATE_BUF_BUFLEN(buf, buflen, stringlen); + } + while (ttlv_len != 0) { + if (tlen < 1) { + if (buflen != 0) { + stringlen=snprintf(buf,buflen, " (ran past the end)"); + UPDATE_BUF_BUFLEN(buf, buflen, stringlen); + } + return plen + 2; + } + ND_TCHECK_1(pptr); + if (buflen != 0) { + stringlen=snprintf(buf,buflen, "%02x", + GET_U_1(pptr)); + pptr++; + UPDATE_BUF_BUFLEN(buf, buflen, stringlen); + } + ttlv_len--; + tlen--; + } + break; + default: + if (buflen != 0) { + stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u", + tlv_type, + tlv_len); + UPDATE_BUF_BUFLEN(buf, buflen, stringlen); + } + if (tlen < ttlv_len) { + if (buflen != 0) { + stringlen=snprintf(buf,buflen, " (ran past the end)"); + UPDATE_BUF_BUFLEN(buf, buflen, stringlen); + } + return plen + 2; + } + tlen -= ttlv_len; + break; + } } + return plen + 2; + } else { + /* complain bitterly ? */ + /* fall through */ + goto trunc; + } trunc: - return -2; + return -2; } int decode_prefix6(netdissect_options *ndo, - const u_char *pd, u_int itemlen, char *buf, u_int buflen) + const u_char *pd, u_int itemlen, char *buf, size_t buflen) { - struct in6_addr addr; - u_int plen, plenbytes; - - ND_TCHECK(pd[0]); - ITEMCHECK(1); - plen = pd[0]; - if (128 < plen) - return -1; - itemlen -= 1; - - memset(&addr, 0, sizeof(addr)); - plenbytes = (plen + 7) / 8; - ND_TCHECK2(pd[1], plenbytes); - ITEMCHECK(plenbytes); - memcpy(&addr, &pd[1], plenbytes); - if (plen % 8) { - addr.s6_addr[plenbytes - 1] &= - ((0xff00 >> (plen % 8)) & 0xff); - } - snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen); - return 1 + plenbytes; + nd_ipv6 addr; + u_int plen, plenbytes; + + ND_TCHECK_1(pd); + ITEMCHECK(1); + plen = GET_U_1(pd); + if (128 < plen) + return -1; + itemlen -= 1; + + memset(&addr, 0, sizeof(addr)); + plenbytes = (plen + 7) / 8; + ND_TCHECK_LEN(pd + 1, plenbytes); + ITEMCHECK(plenbytes); + memcpy(&addr, pd + 1, plenbytes); + if (plen % 8) { + addr[plenbytes - 1] &= + ((0xff00 >> (plen % 8)) & 0xff); + } + snprintf(buf, buflen, "%s/%u", ip6addr_string(ndo, (const u_char *)&addr), plen); + return 1 + plenbytes; trunc: - return -2; + return -2; badtlv: - return -3; + return -3; } static int decode_labeled_prefix6(netdissect_options *ndo, - const u_char *pptr, u_int itemlen, char *buf, u_int buflen) + const u_char *pptr, u_int itemlen, char *buf, size_t buflen) { - struct in6_addr addr; - u_int plen, plenbytes; - - /* prefix length and label = 4 bytes */ - ND_TCHECK2(pptr[0], 4); - ITEMCHECK(4); - plen = pptr[0]; /* get prefix length */ - - if (24 > plen) - return -1; - - plen-=24; /* adjust prefixlen - labellength */ - - if (128 < plen) - return -1; - itemlen -= 4; - - memset(&addr, 0, sizeof(addr)); - plenbytes = (plen + 7) / 8; - ND_TCHECK2(pptr[4], plenbytes); - memcpy(&addr, &pptr[4], plenbytes); - if (plen % 8) { - addr.s6_addr[plenbytes - 1] &= - ((0xff00 >> (plen % 8)) & 0xff); - } - /* the label may get offsetted by 4 bits so lets shift it right */ - snprintf(buf, buflen, "%s/%d, label:%u %s", - ip6addr_string(ndo, &addr), - plen, - EXTRACT_24BITS(pptr+1)>>4, - ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); + nd_ipv6 addr; + u_int plen, plenbytes; + + /* prefix length and label = 4 bytes */ + ND_TCHECK_4(pptr); + ITEMCHECK(4); + plen = GET_U_1(pptr); /* get prefix length */ + + if (24 > plen) + return -1; + + plen -= 24; /* adjust prefixlen - labellength */ + + if (128 < plen) + return -1; + itemlen -= 4; + + memset(&addr, 0, sizeof(addr)); + plenbytes = (plen + 7) / 8; + ND_TCHECK_LEN(pptr + 4, plenbytes); + memcpy(&addr, pptr + 4, plenbytes); + if (plen % 8) { + addr[plenbytes - 1] &= + ((0xff00 >> (plen % 8)) & 0xff); + } + /* the label may get offsetted by 4 bits so lets shift it right */ + snprintf(buf, buflen, "%s/%u, label:%u %s", + ip6addr_string(ndo, (const u_char *)&addr), + plen, + GET_BE_U_3(pptr + 1)>>4, + ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); - return 4 + plenbytes; + return 4 + plenbytes; trunc: - return -2; + return -2; badtlv: - return -3; + return -3; } static int decode_labeled_vpn_prefix6(netdissect_options *ndo, - const u_char *pptr, char *buf, u_int buflen) + const u_char *pptr, char *buf, size_t buflen) { - struct in6_addr addr; - u_int plen; + nd_ipv6 addr; + u_int plen; - ND_TCHECK(pptr[0]); - plen = pptr[0]; /* get prefix length */ + ND_TCHECK_1(pptr); + plen = GET_U_1(pptr); /* get prefix length */ - if ((24+64) > plen) - return -1; + if ((24+64) > plen) + return -1; - plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ + plen -= (24+64); /* adjust prefixlen - labellength - RD len*/ - if (128 < plen) - return -1; + if (128 < plen) + return -1; - memset(&addr, 0, sizeof(addr)); - ND_TCHECK2(pptr[12], (plen + 7) / 8); - memcpy(&addr, &pptr[12], (plen + 7) / 8); - if (plen % 8) { - 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(ndo, pptr+4), - ip6addr_string(ndo, &addr), - plen, - EXTRACT_24BITS(pptr+1)>>4, - ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); + memset(&addr, 0, sizeof(addr)); + ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8); + memcpy(&addr, pptr + 12, (plen + 7) / 8); + if (plen % 8) { + 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/%u, label:%u %s", + bgp_vpn_rd_print(ndo, pptr+4), + ip6addr_string(ndo, (const u_char *)&addr), + plen, + GET_BE_U_3(pptr + 1)>>4, + ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); - return 12 + (plen + 7) / 8; + return 12 + (plen + 7) / 8; trunc: - return -2; + return -2; } static int decode_clnp_prefix(netdissect_options *ndo, - const u_char *pptr, char *buf, u_int buflen) + const u_char *pptr, char *buf, size_t buflen) { - uint8_t addr[19]; - u_int plen; + uint8_t addr[19]; + u_int plen; - ND_TCHECK(pptr[0]); - plen = pptr[0]; /* get prefix length */ + ND_TCHECK_1(pptr); + plen = GET_U_1(pptr); /* get prefix length */ - if (152 < plen) - return -1; + if (152 < plen) + return -1; - memset(&addr, 0, sizeof(addr)); - ND_TCHECK2(pptr[4], (plen + 7) / 8); - memcpy(&addr, &pptr[4], (plen + 7) / 8); - if (plen % 8) { - addr[(plen + 7) / 8 - 1] &= - ((0xff00 >> (plen % 8)) & 0xff); - } - snprintf(buf, buflen, "%s/%d", - isonsap_string(ndo, addr,(plen + 7) / 8), - plen); + memset(&addr, 0, sizeof(addr)); + ND_TCHECK_LEN(pptr + 4, (plen + 7) / 8); + memcpy(&addr, pptr + 4, (plen + 7) / 8); + if (plen % 8) { + addr[(plen + 7) / 8 - 1] &= + ((0xff00 >> (plen % 8)) & 0xff); + } + snprintf(buf, buflen, "%s/%u", + isonsap_string(ndo, addr,(plen + 7) / 8), + plen); - return 1 + (plen + 7) / 8; + return 1 + (plen + 7) / 8; trunc: - return -2; + return -2; } static int decode_labeled_vpn_clnp_prefix(netdissect_options *ndo, - const u_char *pptr, char *buf, u_int buflen) + const u_char *pptr, char *buf, size_t buflen) { - uint8_t addr[19]; - u_int plen; + uint8_t addr[19]; + u_int plen; - ND_TCHECK(pptr[0]); - plen = pptr[0]; /* get prefix length */ + ND_TCHECK_1(pptr); + plen = GET_U_1(pptr); /* get prefix length */ - if ((24+64) > plen) - return -1; + if ((24+64) > plen) + return -1; - plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ + plen -= (24+64); /* adjust prefixlen - labellength - RD len*/ - if (152 < plen) - return -1; + if (152 < plen) + return -1; - memset(&addr, 0, sizeof(addr)); - ND_TCHECK2(pptr[12], (plen + 7) / 8); - memcpy(&addr, &pptr[12], (plen + 7) / 8); - if (plen % 8) { - addr[(plen + 7) / 8 - 1] &= - ((0xff00 >> (plen % 8)) & 0xff); - } - /* the label may get offsetted by 4 bits so lets shift it right */ - snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", - bgp_vpn_rd_print(ndo, pptr+4), - isonsap_string(ndo, addr,(plen + 7) / 8), - plen, - EXTRACT_24BITS(pptr+1)>>4, - ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); + memset(&addr, 0, sizeof(addr)); + ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8); + memcpy(&addr, pptr + 12, (plen + 7) / 8); + if (plen % 8) { + 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/%u, label:%u %s", + bgp_vpn_rd_print(ndo, pptr+4), + isonsap_string(ndo, addr,(plen + 7) / 8), + plen, + GET_BE_U_3(pptr + 1)>>4, + ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); - return 12 + (plen + 7) / 8; + return 12 + (plen + 7) / 8; trunc: - return -2; + return -2; } /* @@ -1294,9 +1476,9 @@ trunc: * both Old speakers that do not support 4 byte AS, and the new speakers that do * support, exchange AS-Path with the same path-attribute type value 0x02. */ -static int +static u_int bgp_attr_get_as_size(netdissect_options *ndo, - uint8_t bgpa_type, const u_char *pptr, int len) + uint8_t bgpa_type, const u_char *pptr, u_int len) { const u_char *tptr = pptr; @@ -1314,16 +1496,16 @@ bgp_attr_get_as_size(netdissect_options *ndo, * each. */ while (tptr < pptr + len) { - ND_TCHECK(tptr[0]); + ND_TCHECK_1(tptr); /* * If we do not find a valid segment type, our guess might be wrong. */ - if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) { + if (GET_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || GET_U_1(tptr) > BGP_AS_SEG_TYPE_MAX) { goto trunc; } - ND_TCHECK(tptr[1]); - tptr += 2 + tptr[1] * 2; + ND_TCHECK_1(tptr + 1); + tptr += 2 + GET_U_1(tptr + 1) * 2; } /* @@ -1342,1536 +1524,1630 @@ trunc: * so that calller can try to decode each AS as of 4 bytes. If indeed * there was not enough data, it will crib and end the parse anyways. */ - return 4; + return 4; } +/* + * The only way to know that a BGP UPDATE message is using add path is + * by checking if the capability is in the OPEN message which we may have missed. + * So this function checks if it is possible that the update could contain add path + * and if so it checks that standard BGP doesn't make sense. + */ static int -bgp_attr_print(netdissect_options *ndo, - u_int atype, const u_char *pptr, u_int len) +check_add_path(netdissect_options *ndo, const u_char *pptr, u_int length, + u_int max_prefix_length) { - int i; - uint16_t af; - uint8_t safi, snpa, nhlen; - union { /* copy buffer for bandwidth values */ - float f; - uint32_t i; - } bw; - int advance; - u_int tlen; - const u_char *tptr; - char buf[MAXHOSTNAMELEN + 100]; - int as_size; - - tptr = pptr; - tlen=len; - - switch (atype) { - case BGPTYPE_ORIGIN: - if (len != 1) - ND_PRINT((ndo, "invalid len")); - else { - ND_TCHECK(*tptr); - ND_PRINT((ndo, "%s", tok2str(bgp_origin_values, - "Unknown Origin Typecode", - tptr[0]))); - } - break; + u_int offset, prefix_length; + + if (length < 5) { + return 0; + } + /* + * Scan through the NLRI information under the assumpetion that + * it doesn't have path IDs. + */ + for (offset = 0; offset < length;) { + offset += 4; + if (!ND_TTEST_1(pptr + offset)) { + /* We ran out of captured data; quit scanning. */ + break; + } + prefix_length = GET_U_1(pptr + offset); /* - * Process AS4 byte path and AS2 byte path attributes here. + * Add 4 to cover the path id + * and check the prefix length isn't greater than 32/128. */ - case BGPTYPE_AS4_PATH: - case BGPTYPE_AS_PATH: - if (len % 2) { - ND_PRINT((ndo, "invalid len")); - break; - } - if (!len) { - ND_PRINT((ndo, "empty")); - break; - } + if (prefix_length > max_prefix_length) { + return 0; + } + /* Add 1 for the prefix_length byte and prefix_length to cover the address */ + offset += 1 + ((prefix_length + 7) / 8); + } + /* check we haven't gone past the end of the section */ + if (offset > length) { + return 0; + } - /* - * BGP updates exchanged between New speakers that support 4 - * byte AS, ASs are always encoded in 4 bytes. There is no - * definitive way to find this, just by the packet's - * contents. So, check for packet's TLV's sanity assuming - * 2 bytes first, and it does not pass, assume that ASs are - * encoded in 4 bytes format and move on. - */ - as_size = bgp_attr_get_as_size(ndo, atype, pptr, len); - - while (tptr < pptr + len) { - ND_TCHECK(tptr[0]); - ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values, - "?", tptr[0]))); - for (i = 0; i < tptr[1] * as_size; i += as_size) { - ND_TCHECK2(tptr[2 + i], as_size); - ND_PRINT((ndo, "%s ", - as_printf(ndo, astostr, sizeof(astostr), - as_size == 2 ? - EXTRACT_16BITS(&tptr[2 + i]) : - EXTRACT_32BITS(&tptr[2 + i])))); - } - ND_TCHECK(tptr[0]); - ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values, - "?", tptr[0]))); - ND_TCHECK(tptr[1]); - tptr += 2 + tptr[1] * as_size; - } - break; - case BGPTYPE_NEXT_HOP: - if (len != 4) - ND_PRINT((ndo, "invalid len")); - else { - ND_TCHECK2(tptr[0], 4); - ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr))); - } - break; - case BGPTYPE_MULTI_EXIT_DISC: - case BGPTYPE_LOCAL_PREF: - if (len != 4) - ND_PRINT((ndo, "invalid len")); - else { - ND_TCHECK2(tptr[0], 4); - ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr))); - } - break; - case BGPTYPE_ATOMIC_AGGREGATE: - if (len != 0) - ND_PRINT((ndo, "invalid len")); - break; - case BGPTYPE_AGGREGATOR: - - /* - * Depending on the AS encoded is of 2 bytes or of 4 bytes, - * the length of this PA can be either 6 bytes or 8 bytes. - */ - if (len != 6 && len != 8) { - ND_PRINT((ndo, "invalid len")); - break; + /* check it's not standard BGP */ + for (offset = 0; offset < length; ) { + if (!ND_TTEST_1(pptr + offset)) { + /* We ran out of captured data; quit scanning. */ + break; + } + prefix_length = GET_U_1(pptr + offset); + /* + * If the prefix_length is zero (0.0.0.0/0) + * and since it's not the only address (length >= 5) + * then it is add-path + */ + if (prefix_length < 1 || prefix_length > max_prefix_length) { + return 1; + } + offset += 1 + ((prefix_length + 7) / 8); + } + if (offset > length) { + return 1; + } + + /* assume not add-path by default */ + return 0; +} + +static int +bgp_mp_af_print(netdissect_options *ndo, + const u_char *tptr, u_int tlen, + uint16_t *afp, uint8_t *safip) +{ + uint16_t af; + uint8_t safi; + + af = GET_BE_U_2(tptr); + *afp = af; + safi = GET_U_1(tptr + 2); + *safip = safi; + + ND_PRINT("\n\t AFI: %s (%u), %sSAFI: %s (%u)", + tok2str(af_values, "Unknown AFI", af), + af, + (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ + tok2str(bgp_safi_values, "Unknown SAFI", safi), + safi); + + switch(af<<8 | safi) { + case (AFNUM_INET<<8 | SAFNUM_UNICAST): + case (AFNUM_INET<<8 | SAFNUM_MULTICAST): + case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): + case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): + case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): + case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): + case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): + case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): + case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): + case (AFNUM_INET<<8 | SAFNUM_MDT): + case (AFNUM_INET6<<8 | SAFNUM_UNICAST): + case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): + case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): + case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): + case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): + case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): + case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): + case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): + case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): + case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): + case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): + case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): + case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): + case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): + case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): + case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): + case (AFNUM_VPLS<<8 | SAFNUM_VPLS): + break; + default: + ND_TCHECK_LEN(tptr, tlen); + ND_PRINT("\n\t no AFI %u / SAFI %u decoder", af, safi); + if (ndo->ndo_vflag <= 1) + print_unknown_data(ndo, tptr, "\n\t ", tlen); + return -1; + } + return 0; +trunc: + return -2; +} + +static int +bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi, + const u_char *tptr, u_int len, + char *buf, size_t buflen, + int add_path4, int add_path6) +{ + int advance; + u_int path_id = 0; + + switch (af<<8 | safi) { + case (AFNUM_INET<<8 | SAFNUM_UNICAST): + case (AFNUM_INET<<8 | SAFNUM_MULTICAST): + case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): + if (add_path4) { + path_id = GET_BE_U_4(tptr); + tptr += 4; } - ND_TCHECK2(tptr[0], len); - if (len == 6) { - ND_PRINT((ndo, " AS #%s, origin %s", - as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)), - ipaddr_string(ndo, tptr + 2))); - } else { - ND_PRINT((ndo, " AS #%s, origin %s", - as_printf(ndo, astostr, sizeof(astostr), - EXTRACT_32BITS(tptr)), ipaddr_string(ndo, tptr + 4))); + advance = decode_prefix4(ndo, tptr, len, buf, buflen); + if (advance == -1) + ND_PRINT("\n\t (illegal prefix length)"); + else if (advance == -2) + goto trunc; + else if (advance == -3) + break; /* bytes left, but not enough */ + else + ND_PRINT("\n\t %s", buf); + if (add_path4) { + ND_PRINT(" Path Id: %u", path_id); + advance += 4; } break; - case BGPTYPE_AGGREGATOR4: - if (len != 8) { - ND_PRINT((ndo, "invalid len")); - break; - } - ND_TCHECK2(tptr[0], 8); - ND_PRINT((ndo, " AS #%s, origin %s", - as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)), - ipaddr_string(ndo, tptr + 4))); - break; - case BGPTYPE_COMMUNITIES: - if (len % 4) { - ND_PRINT((ndo, "invalid len")); - break; - } - while (tlen>0) { - uint32_t comm; - ND_TCHECK2(tptr[0], 4); - comm = EXTRACT_32BITS(tptr); - switch (comm) { - case BGP_COMMUNITY_NO_EXPORT: - ND_PRINT((ndo, " NO_EXPORT")); - break; - case BGP_COMMUNITY_NO_ADVERT: - ND_PRINT((ndo, " NO_ADVERTISE")); - break; - case BGP_COMMUNITY_NO_EXPORT_SUBCONFED: - ND_PRINT((ndo, " NO_EXPORT_SUBCONFED")); - break; - default: - ND_PRINT((ndo, "%u:%u%s", - (comm >> 16) & 0xffff, - comm & 0xffff, - (tlen>4) ? ", " : "")); - break; - } - tlen -=4; - tptr +=4; - } - break; - case BGPTYPE_ORIGINATOR_ID: - if (len != 4) { - ND_PRINT((ndo, "invalid len")); - break; - } - ND_TCHECK2(tptr[0], 4); - ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr))); + case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): + advance = decode_labeled_prefix4(ndo, tptr, len, buf, buflen); + if (advance == -1) + ND_PRINT("\n\t (illegal prefix length)"); + else if (advance == -2) + goto trunc; + else if (advance == -3) + break; /* bytes left, but not enough */ + else + ND_PRINT("\n\t %s", buf); + break; + case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): + case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): + case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): + advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, buflen); + if (advance == -1) + ND_PRINT("\n\t (illegal prefix length)"); + else if (advance == -2) + goto trunc; + else + ND_PRINT("\n\t %s", buf); + break; + case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): + advance = decode_rt_routing_info(ndo, tptr); + if (advance == -2) + goto trunc; break; - case BGPTYPE_CLUSTER_LIST: - if (len % 4) { - ND_PRINT((ndo, "invalid len")); - break; - } - while (tlen>0) { - ND_TCHECK2(tptr[0], 4); - ND_PRINT((ndo, "%s%s", - ipaddr_string(ndo, tptr), - (tlen>4) ? ", " : "")); - tlen -=4; - tptr +=4; + case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ + case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): + advance = decode_multicast_vpn(ndo, tptr, buf, buflen); + if (advance == -1) + ND_PRINT("\n\t (illegal prefix length)"); + else if (advance == -2) + goto trunc; + else + ND_PRINT("\n\t %s", buf); + break; + + case (AFNUM_INET<<8 | SAFNUM_MDT): + advance = decode_mdt_vpn_nlri(ndo, tptr, buf, buflen); + if (advance == -1) + ND_PRINT("\n\t (illegal prefix length)"); + else if (advance == -2) + goto trunc; + else + ND_PRINT("\n\t %s", buf); + break; + case (AFNUM_INET6<<8 | SAFNUM_UNICAST): + case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): + case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): + if (add_path6) { + path_id = GET_BE_U_4(tptr); + tptr += 4; + } + advance = decode_prefix6(ndo, tptr, len, buf, buflen); + if (advance == -1) + ND_PRINT("\n\t (illegal prefix length)"); + else if (advance == -2) + goto trunc; + else if (advance == -3) + break; /* bytes left, but not enough */ + else + ND_PRINT("\n\t %s", buf); + if (add_path6) { + ND_PRINT(" Path Id: %u", path_id); + advance += 4; } break; - case BGPTYPE_MP_REACH_NLRI: - ND_TCHECK2(tptr[0], 3); - af = EXTRACT_16BITS(tptr); - safi = tptr[2]; - - ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)", - tok2str(af_values, "Unknown AFI", af), - af, - (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ - tok2str(bgp_safi_values, "Unknown SAFI", safi), - safi)); + case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): + advance = decode_labeled_prefix6(ndo, tptr, len, buf, buflen); + if (advance == -1) + ND_PRINT("\n\t (illegal prefix length)"); + else if (advance == -2) + goto trunc; + else if (advance == -3) + break; /* bytes left, but not enough */ + else + ND_PRINT("\n\t %s", buf); + break; + case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): + case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): + case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): + advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, buflen); + if (advance == -1) + ND_PRINT("\n\t (illegal prefix length)"); + else if (advance == -2) + goto trunc; + else + ND_PRINT("\n\t %s", buf); + break; + case (AFNUM_VPLS<<8 | SAFNUM_VPLS): + case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): + case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): + case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): + advance = decode_labeled_vpn_l2(ndo, tptr, buf, buflen); + if (advance == -1) + ND_PRINT("\n\t (illegal length)"); + else if (advance == -2) + goto trunc; + else + ND_PRINT("\n\t %s", buf); + break; + case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): + case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): + case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): + advance = decode_clnp_prefix(ndo, tptr, buf, buflen); + if (advance == -1) + ND_PRINT("\n\t (illegal prefix length)"); + else if (advance == -2) + goto trunc; + else + ND_PRINT("\n\t %s", buf); + break; + case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): + case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): + case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): + advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, buflen); + if (advance == -1) + ND_PRINT("\n\t (illegal prefix length)"); + else if (advance == -2) + goto trunc; + else + ND_PRINT("\n\t %s", buf); + break; + default: + /* + * This should not happen, we should have been protected + * by bgp_mp_af_print()'s return value. + */ + ND_PRINT("\n\t ERROR: no AFI %u / SAFI %u decoder", af, safi); + advance = -4; + break; + } + return advance; +trunc: /* we rely on the caller to recognize -2 return value */ + return -2; +} + +static int +bgp_attr_print(netdissect_options *ndo, + uint8_t atype, const u_char *pptr, u_int len, + const unsigned attr_set_level) +{ + u_int i; + uint16_t af; + uint8_t safi, snpa, nhlen; + int advance; + u_int tlen; + const u_char *tptr; + char buf[MAXHOSTNAMELEN + 100]; + u_int as_size; + int add_path4, add_path6; + int ret; + + tptr = pptr; + tlen = len; + + switch (atype) { + case BGPTYPE_ORIGIN: + if (len != 1) + ND_PRINT("invalid len"); + else { + ND_TCHECK_1(tptr); + ND_PRINT("%s", tok2str(bgp_origin_values, + "Unknown Origin Typecode", + GET_U_1(tptr))); + } + break; + + /* + * Process AS4 byte path and AS2 byte path attributes here. + */ + case BGPTYPE_AS4_PATH: + case BGPTYPE_AS_PATH: + if (len % 2) { + ND_PRINT("invalid len"); + break; + } + if (!len) { + ND_PRINT("empty"); + break; + } + + /* + * BGP updates exchanged between New speakers that support 4 + * byte AS, ASs are always encoded in 4 bytes. There is no + * definitive way to find this, just by the packet's + * contents. So, check for packet's TLV's sanity assuming + * 2 bytes first, and it does not pass, assume that ASs are + * encoded in 4 bytes format and move on. + */ + as_size = bgp_attr_get_as_size(ndo, atype, pptr, len); + + while (tptr < pptr + len) { + ND_TCHECK_1(tptr); + ND_PRINT("%s", tok2str(bgp_as_path_segment_open_values, + "?", GET_U_1(tptr))); + ND_TCHECK_1(tptr + 1); + for (i = 0; i < GET_U_1(tptr + 1) * as_size; i += as_size) { + ND_TCHECK_LEN(tptr + 2 + i, as_size); + ND_PRINT("%s ", + as_printf(ndo, astostr, sizeof(astostr), + as_size == 2 ? + GET_BE_U_2(tptr + i + 2) : + GET_BE_U_4(tptr + i + 2))); + } + ND_TCHECK_1(tptr); + ND_PRINT("%s", tok2str(bgp_as_path_segment_close_values, + "?", GET_U_1(tptr))); + ND_TCHECK_1(tptr + 1); + tptr += 2 + GET_U_1(tptr + 1) * as_size; + } + break; + case BGPTYPE_NEXT_HOP: + if (len != 4) + ND_PRINT("invalid len"); + else { + ND_TCHECK_4(tptr); + ND_PRINT("%s", ipaddr_string(ndo, tptr)); + } + break; + case BGPTYPE_MULTI_EXIT_DISC: + case BGPTYPE_LOCAL_PREF: + if (len != 4) + ND_PRINT("invalid len"); + else { + ND_TCHECK_4(tptr); + ND_PRINT("%u", GET_BE_U_4(tptr)); + } + break; + case BGPTYPE_ATOMIC_AGGREGATE: + if (len != 0) + ND_PRINT("invalid len"); + break; + case BGPTYPE_AGGREGATOR: + + /* + * Depending on the AS encoded is of 2 bytes or of 4 bytes, + * the length of this PA can be either 6 bytes or 8 bytes. + */ + if (len != 6 && len != 8) { + ND_PRINT("invalid len"); + break; + } + ND_TCHECK_LEN(tptr, len); + if (len == 6) { + ND_PRINT(" AS #%s, origin %s", + as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(tptr)), + ipaddr_string(ndo, tptr + 2)); + } else { + ND_PRINT(" AS #%s, origin %s", + as_printf(ndo, astostr, sizeof(astostr), + GET_BE_U_4(tptr)), ipaddr_string(ndo, tptr + 4)); + } + break; + case BGPTYPE_AGGREGATOR4: + if (len != 8) { + ND_PRINT("invalid len"); + break; + } + ND_TCHECK_8(tptr); + ND_PRINT(" AS #%s, origin %s", + as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)), + ipaddr_string(ndo, tptr + 4)); + break; + case BGPTYPE_COMMUNITIES: + if (len % 4) { + ND_PRINT("invalid len"); + break; + } + while (tlen != 0) { + uint32_t comm; + ND_TCHECK_4(tptr); + if (tlen < 4) + goto trunc; + comm = GET_BE_U_4(tptr); + switch (comm) { + case BGP_COMMUNITY_NO_EXPORT: + ND_PRINT(" NO_EXPORT"); + break; + case BGP_COMMUNITY_NO_ADVERT: + ND_PRINT(" NO_ADVERTISE"); + break; + case BGP_COMMUNITY_NO_EXPORT_SUBCONFED: + ND_PRINT(" NO_EXPORT_SUBCONFED"); + break; + default: + ND_PRINT("%u:%u%s", + (comm >> 16) & 0xffff, + comm & 0xffff, + (tlen>4) ? ", " : ""); + break; + } + tlen -=4; + tptr +=4; + } + break; + case BGPTYPE_ORIGINATOR_ID: + if (len != 4) { + ND_PRINT("invalid len"); + break; + } + ND_TCHECK_4(tptr); + ND_PRINT("%s",ipaddr_string(ndo, tptr)); + break; + case BGPTYPE_CLUSTER_LIST: + if (len % 4) { + ND_PRINT("invalid len"); + break; + } + while (tlen != 0) { + ND_TCHECK_4(tptr); + if (tlen < 4) + goto trunc; + ND_PRINT("%s%s", + ipaddr_string(ndo, tptr), + (tlen>4) ? ", " : ""); + tlen -=4; + tptr +=4; + } + break; + case BGPTYPE_MP_REACH_NLRI: + ND_TCHECK_3(tptr); + if (tlen < 3) + goto trunc; + ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi); + if (ret == -2) + goto trunc; + if (ret < 0) + break; + tptr += 3; + tlen -= 3; + + ND_TCHECK_1(tptr); + nhlen = GET_U_1(tptr); + tptr++; + tlen--; + + if (nhlen) { + u_int nnh = 0; + uint8_t tnhlen = nhlen; + if (tlen < tnhlen) + goto trunc; + ND_PRINT("\n\t nexthop: "); + while (tnhlen != 0) { + if (nnh++ > 0) { + ND_PRINT(", " ); + } switch(af<<8 | safi) { case (AFNUM_INET<<8 | SAFNUM_UNICAST): case (AFNUM_INET<<8 | SAFNUM_MULTICAST): case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): + case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): + case (AFNUM_INET<<8 | SAFNUM_MDT): + if (tnhlen < sizeof(nd_ipv4)) { + ND_PRINT("invalid len"); + tptr += tnhlen; + tlen -= tnhlen; + tnhlen = 0; + } else { + ND_TCHECK_LEN(tptr, sizeof(nd_ipv4)); + ND_PRINT("%s",ipaddr_string(ndo, tptr)); + tptr += sizeof(nd_ipv4); + tnhlen -= sizeof(nd_ipv4); + tlen -= sizeof(nd_ipv4); + } + break; case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): - case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): - case (AFNUM_INET<<8 | SAFNUM_MDT): + if (tnhlen < sizeof(nd_ipv4)+BGP_VPN_RD_LEN) { + ND_PRINT("invalid len"); + tptr += tnhlen; + tlen -= tnhlen; + tnhlen = 0; + } else { + ND_TCHECK_LEN(tptr, + sizeof(nd_ipv4) + BGP_VPN_RD_LEN); + ND_PRINT("RD: %s, %s", + bgp_vpn_rd_print(ndo, tptr), + ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN)); + tptr += (sizeof(nd_ipv4)+BGP_VPN_RD_LEN); + tlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN); + tnhlen -= (sizeof(nd_ipv4)+BGP_VPN_RD_LEN); + } + break; case (AFNUM_INET6<<8 | SAFNUM_UNICAST): case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): + if (tnhlen < sizeof(nd_ipv6)) { + ND_PRINT("invalid len"); + tptr += tnhlen; + tlen -= tnhlen; + tnhlen = 0; + } else { + ND_TCHECK_LEN(tptr, sizeof(nd_ipv6)); + ND_PRINT("%s", ip6addr_string(ndo, tptr)); + tptr += sizeof(nd_ipv6); + tlen -= sizeof(nd_ipv6); + tnhlen -= sizeof(nd_ipv6); + } + break; case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): + if (tnhlen < sizeof(nd_ipv6)+BGP_VPN_RD_LEN) { + ND_PRINT("invalid len"); + tptr += tnhlen; + tlen -= tnhlen; + tnhlen = 0; + } else { + ND_TCHECK_LEN(tptr, + sizeof(nd_ipv6) + BGP_VPN_RD_LEN); + ND_PRINT("RD: %s, %s", + bgp_vpn_rd_print(ndo, tptr), + ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN)); + tptr += (sizeof(nd_ipv6)+BGP_VPN_RD_LEN); + tlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN); + tnhlen -= (sizeof(nd_ipv6)+BGP_VPN_RD_LEN); + } + break; + case (AFNUM_VPLS<<8 | SAFNUM_VPLS): + case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): + case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): + case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): + if (tnhlen < sizeof(nd_ipv4)) { + ND_PRINT("invalid len"); + tptr += tnhlen; + tlen -= tnhlen; + tnhlen = 0; + } else { + ND_TCHECK_LEN(tptr, sizeof(nd_ipv4)); + ND_PRINT("%s", ipaddr_string(ndo, tptr)); + tptr += (sizeof(nd_ipv4)); + tlen -= (sizeof(nd_ipv4)); + tnhlen -= (sizeof(nd_ipv4)); + } + break; case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): + ND_TCHECK_LEN(tptr, tnhlen); + ND_PRINT("%s", isonsap_string(ndo, tptr, tnhlen)); + tptr += tnhlen; + tlen -= tnhlen; + tnhlen = 0; + break; + case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): - case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): - case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): - case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): - case (AFNUM_VPLS<<8 | SAFNUM_VPLS): + if (tnhlen < BGP_VPN_RD_LEN+1) { + ND_PRINT("invalid len"); + tptr += tnhlen; + tlen -= tnhlen; + tnhlen = 0; + } else { + ND_TCHECK_LEN(tptr, tnhlen); + ND_PRINT("RD: %s, %s", + bgp_vpn_rd_print(ndo, tptr), + isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tnhlen-BGP_VPN_RD_LEN)); + /* rfc986 mapped IPv4 address ? */ + if (GET_BE_U_4(tptr + BGP_VPN_RD_LEN) == 0x47000601) + ND_PRINT(" = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4)); + /* rfc1888 mapped IPv6 address ? */ + else if (GET_BE_U_3(tptr + BGP_VPN_RD_LEN) == 0x350000) + ND_PRINT(" = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3)); + tptr += tnhlen; + tlen -= tnhlen; + tnhlen = 0; + } break; default: - ND_TCHECK2(tptr[0], tlen); - ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi)); - if (ndo->ndo_vflag <= 1) - print_unknown_data(ndo, tptr, "\n\t ", tlen); + /* + * bgp_mp_af_print() should have saved us from + * an unsupported AFI/SAFI. + */ + ND_PRINT("ERROR: no AFI %u/SAFI %u nexthop decoder", af, safi); + tptr += tnhlen; + tlen -= tnhlen; + tnhlen = 0; goto done; break; } + } + } + ND_PRINT(", nh-length: %u", nhlen); - tptr +=3; - - ND_TCHECK(tptr[0]); - nhlen = tptr[0]; - tlen = nhlen; + /* As per RFC 2858; this is reserved in RFC 4760 */ + if (tlen < 1) + goto trunc; + ND_TCHECK_1(tptr); + snpa = GET_U_1(tptr); + tptr++; + tlen--; + + if (snpa) { + ND_PRINT("\n\t %u SNPA", snpa); + for (/*nothing*/; snpa != 0; snpa--) { + uint8_t snpalen; + if (tlen < 1) + goto trunc; + ND_TCHECK_1(tptr); + snpalen = GET_U_1(tptr); + ND_PRINT("\n\t %u bytes", snpalen); tptr++; + tlen--; + if (tlen < snpalen) + goto trunc; + tptr += snpalen; + tlen -= snpalen; + } + } else { + ND_PRINT(", no SNPA"); + } - if (tlen) { - int nnh = 0; - ND_PRINT((ndo, "\n\t nexthop: ")); - while (tlen > 0) { - if ( nnh++ > 0 ) { - ND_PRINT((ndo, ", " )); - } - switch(af<<8 | safi) { - case (AFNUM_INET<<8 | SAFNUM_UNICAST): - case (AFNUM_INET<<8 | SAFNUM_MULTICAST): - case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): - case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): - case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): - case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): - case (AFNUM_INET<<8 | SAFNUM_MDT): - if (tlen < (int)sizeof(struct in_addr)) { - ND_PRINT((ndo, "invalid len")); - tlen = 0; - } else { - ND_TCHECK2(tptr[0], sizeof(struct in_addr)); - ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr))); - tlen -= sizeof(struct in_addr); - tptr += sizeof(struct in_addr); - } - break; - case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): - case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): - case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): - if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) { - ND_PRINT((ndo, "invalid len")); - tlen = 0; - } else { - ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN); - ND_PRINT((ndo, "RD: %s, %s", - bgp_vpn_rd_print(ndo, tptr), - ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN))); - tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN); - tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN); - } - break; - case (AFNUM_INET6<<8 | SAFNUM_UNICAST): - case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): - case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): - case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): - if (tlen < (int)sizeof(struct in6_addr)) { - ND_PRINT((ndo, "invalid len")); - tlen = 0; - } else { - ND_TCHECK2(tptr[0], sizeof(struct in6_addr)); - ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr))); - tlen -= sizeof(struct in6_addr); - tptr += sizeof(struct in6_addr); - } - break; - case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): - case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): - case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): - if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) { - ND_PRINT((ndo, "invalid len")); - tlen = 0; - } else { - ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN); - ND_PRINT((ndo, "RD: %s, %s", - bgp_vpn_rd_print(ndo, tptr), - ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN))); - tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); - tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); - } - break; - case (AFNUM_VPLS<<8 | SAFNUM_VPLS): - case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): - case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): - case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): - if (tlen < (int)sizeof(struct in_addr)) { - ND_PRINT((ndo, "invalid len")); - tlen = 0; - } else { - ND_TCHECK2(tptr[0], sizeof(struct in_addr)); - ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr))); - tlen -= (sizeof(struct in_addr)); - tptr += (sizeof(struct in_addr)); - } - break; - case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): - case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): - case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): - ND_TCHECK2(tptr[0], tlen); - ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen))); - tptr += tlen; - tlen = 0; - break; - - case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): - case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): - case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): - if (tlen < BGP_VPN_RD_LEN+1) { - ND_PRINT((ndo, "invalid len")); - tlen = 0; - } else { - ND_TCHECK2(tptr[0], tlen); - ND_PRINT((ndo, "RD: %s, %s", - bgp_vpn_rd_print(ndo, tptr), - isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN))); - /* rfc986 mapped IPv4 address ? */ - if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601) - ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4))); - /* rfc1888 mapped IPv6 address ? */ - else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000) - ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3))); - tptr += tlen; - tlen = 0; - } - break; - default: - ND_TCHECK2(tptr[0], tlen); - ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi)); - if (ndo->ndo_vflag <= 1) - print_unknown_data(ndo, tptr, "\n\t ", tlen); - tptr += tlen; - tlen = 0; - goto done; - break; - } - } - } - ND_PRINT((ndo, ", nh-length: %u", nhlen)); - tptr += tlen; - - ND_TCHECK(tptr[0]); - snpa = tptr[0]; - tptr++; - - if (snpa) { - ND_PRINT((ndo, "\n\t %u SNPA", snpa)); - for (/*nothing*/; snpa > 0; snpa--) { - ND_TCHECK(tptr[0]); - ND_PRINT((ndo, "\n\t %d bytes", tptr[0])); - tptr += tptr[0] + 1; - } - } else { - ND_PRINT((ndo, ", no SNPA")); - } + add_path4 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 32); + add_path6 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 128); - while (len - (tptr - pptr) > 0) { - switch (af<<8 | safi) { - case (AFNUM_INET<<8 | SAFNUM_UNICAST): - case (AFNUM_INET<<8 | SAFNUM_MULTICAST): - case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): - advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else if (advance == -3) - break; /* bytes left, but not enough */ - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): - advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else if (advance == -3) - break; /* bytes left, but not enough */ - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): - case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): - case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): - advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): - advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ - case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): - advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - - case (AFNUM_INET<<8 | SAFNUM_MDT): - advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_INET6<<8 | SAFNUM_UNICAST): - case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): - case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): - advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else if (advance == -3) - break; /* bytes left, but not enough */ - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): - advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else if (advance == -3) - break; /* bytes left, but not enough */ - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): - case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): - case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): - advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_VPLS<<8 | SAFNUM_VPLS): - case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): - case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): - case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): - advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal length)")); - else if (advance == -2) - goto trunc; - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): - case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): - case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): - advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): - case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): - case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): - advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - default: - ND_TCHECK2(*tptr,tlen); - ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi)); - if (ndo->ndo_vflag <= 1) - print_unknown_data(ndo, tptr, "\n\t ", tlen); - advance = 0; - tptr = pptr + len; - break; - } - if (advance < 0) - break; - tptr += advance; - } - done: - break; - - case BGPTYPE_MP_UNREACH_NLRI: - ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE); - af = EXTRACT_16BITS(tptr); - safi = tptr[2]; - - ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)", - tok2str(af_values, "Unknown AFI", af), - af, - (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ - tok2str(bgp_safi_values, "Unknown SAFI", safi), - safi)); - - if (len == BGP_MP_NLRI_MINSIZE) - ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)")); - - tptr += 3; - - while (len - (tptr - pptr) > 0) { - switch (af<<8 | safi) { - case (AFNUM_INET<<8 | SAFNUM_UNICAST): - case (AFNUM_INET<<8 | SAFNUM_MULTICAST): - case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): - advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else if (advance == -3) - break; /* bytes left, but not enough */ - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): - advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else if (advance == -3) - break; /* bytes left, but not enough */ - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): - case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): - case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): - advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_INET6<<8 | SAFNUM_UNICAST): - case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): - case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): - advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else if (advance == -3) - break; /* bytes left, but not enough */ - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): - advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else if (advance == -3) - break; /* bytes left, but not enough */ - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): - case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): - case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): - advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_VPLS<<8 | SAFNUM_VPLS): - case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): - case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): - case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): - advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal length)")); - else if (advance == -2) - goto trunc; - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): - case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): - case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): - advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): - case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): - case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): - advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_INET<<8 | SAFNUM_MDT): - advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ - case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): - advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf)); - if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; - else - ND_PRINT((ndo, "\n\t %s", buf)); - break; - default: - ND_TCHECK2(*(tptr-3),tlen); - ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi)); - if (ndo->ndo_vflag <= 1) - print_unknown_data(ndo, tptr-3, "\n\t ", tlen); - advance = 0; - tptr = pptr + len; - break; - } - if (advance < 0) - break; - tptr += advance; - } - break; - case BGPTYPE_EXTD_COMMUNITIES: - if (len % 8) { - ND_PRINT((ndo, "invalid len")); - break; - } - while (tlen>0) { - uint16_t extd_comm; - - ND_TCHECK2(tptr[0], 2); - extd_comm=EXTRACT_16BITS(tptr); - - ND_PRINT((ndo, "\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))); - - ND_TCHECK2(*(tptr+2), 6); - switch(extd_comm) { - case BGP_EXT_COM_RT_0: - case BGP_EXT_COM_RO_0: - case BGP_EXT_COM_L2VPN_RT_0: - ND_PRINT((ndo, ": %u:%u (= %s)", - EXTRACT_16BITS(tptr+2), - EXTRACT_32BITS(tptr+4), - ipaddr_string(ndo, tptr+4))); - break; - case BGP_EXT_COM_RT_1: - case BGP_EXT_COM_RO_1: - case BGP_EXT_COM_L2VPN_RT_1: - case BGP_EXT_COM_VRF_RT_IMP: - ND_PRINT((ndo, ": %s:%u", - ipaddr_string(ndo, tptr+2), - EXTRACT_16BITS(tptr+6))); - break; - case BGP_EXT_COM_RT_2: - case BGP_EXT_COM_RO_2: - ND_PRINT((ndo, ": %s:%u", - as_printf(ndo, astostr, sizeof(astostr), - EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6))); - break; - case BGP_EXT_COM_LINKBAND: - bw.i = EXTRACT_32BITS(tptr+2); - ND_PRINT((ndo, ": 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: - ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2))); - break; - case BGP_EXT_COM_OSPF_RTYPE: - case BGP_EXT_COM_OSPF_RTYPE2: - ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s", - ipaddr_string(ndo, 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) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "")); - break; - case BGP_EXT_COM_L2INFO: - ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u", - tok2str(l2vpn_encaps_values, - "unknown encaps", - *(tptr+2)), - *(tptr+3), - EXTRACT_16BITS(tptr+4))); - break; - case BGP_EXT_COM_SOURCE_AS: - ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2))); - break; - default: - ND_TCHECK2(*tptr,8); - print_unknown_data(ndo, tptr, "\n\t ", 8); - break; - } - tlen -=8; - tptr +=8; - } + while (tptr < pptr + len) { + advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf), + add_path4, add_path6); + if (advance == -2) + goto trunc; + if (advance < 0) break; + tptr += advance; + } + break; - case BGPTYPE_PMSI_TUNNEL: - { - uint8_t tunnel_type, flags; - - tunnel_type = *(tptr+1); - flags = *tptr; - tlen = len; - - ND_TCHECK2(tptr[0], 5); - ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u", - tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type), - tunnel_type, - bittok2str(bgp_pmsi_flag_values, "none", flags), - EXTRACT_24BITS(tptr+2)>>4)); - - tptr +=5; - tlen -= 5; - - switch (tunnel_type) { - case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */ - case BGP_PMSI_TUNNEL_PIM_BIDIR: - ND_TCHECK2(tptr[0], 8); - ND_PRINT((ndo, "\n\t Sender %s, P-Group %s", - ipaddr_string(ndo, tptr), - ipaddr_string(ndo, tptr+4))); - break; + case BGPTYPE_MP_UNREACH_NLRI: + ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE); + ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi); + if (ret == -2) + goto trunc; + if (ret < 0) + break; - case BGP_PMSI_TUNNEL_PIM_SSM: - ND_TCHECK2(tptr[0], 8); - ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s", - ipaddr_string(ndo, tptr), - ipaddr_string(ndo, tptr+4))); - break; - case BGP_PMSI_TUNNEL_INGRESS: - ND_TCHECK2(tptr[0], 4); - ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s", - ipaddr_string(ndo, tptr))); - break; - case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */ - case BGP_PMSI_TUNNEL_LDP_MP2MP: - ND_TCHECK2(tptr[0], 8); - ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x", - ipaddr_string(ndo, tptr), - EXTRACT_32BITS(tptr+4))); - break; - case BGP_PMSI_TUNNEL_RSVP_P2MP: - ND_TCHECK2(tptr[0], 8); - ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x", - ipaddr_string(ndo, tptr), - EXTRACT_32BITS(tptr+4))); - break; - default: - if (ndo->ndo_vflag <= 1) { - print_unknown_data(ndo, tptr, "\n\t ", tlen); - } - } + if (len == BGP_MP_NLRI_MINSIZE) + ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)"); + + tptr += 3; + + add_path4 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 32); + add_path6 = check_add_path(ndo, tptr, (len-ND_BYTES_BETWEEN(tptr, pptr)), 128); + + while (tptr < pptr + len) { + advance = bgp_nlri_print(ndo, af, safi, tptr, len, buf, sizeof(buf), + add_path4, add_path6); + if (advance == -2) + goto trunc; + if (advance < 0) break; + tptr += advance; + } + break; + case BGPTYPE_EXTD_COMMUNITIES: + if (len % 8) { + ND_PRINT("invalid len"); + break; } - case BGPTYPE_AIGP: - { - uint8_t type; - uint16_t length; + while (tlen != 0) { + uint16_t extd_comm; + + ND_TCHECK_2(tptr); + if (tlen < 2) + goto trunc; + extd_comm=GET_BE_U_2(tptr); + + ND_PRINT("\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)); + + ND_TCHECK_8(tptr); + if (tlen < 8) + goto trunc; + ND_PRINT(": "); + bgp_extended_community_print(ndo, tptr); + tlen -= 8; + tptr += 8; + } + break; - ND_TCHECK2(tptr[0], 3); + case BGPTYPE_PMSI_TUNNEL: + { + uint8_t tunnel_type, flags; - tlen = len; + ND_TCHECK_5(tptr); + if (tlen < 5) + goto trunc; + flags = GET_U_1(tptr); + tunnel_type = GET_U_1(tptr + 1); + tlen = len; + + ND_PRINT("\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u", + tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type), + tunnel_type, + bittok2str(bgp_pmsi_flag_values, "none", flags), + GET_BE_U_3(tptr + 2)>>4); + + tptr +=5; + tlen -= 5; + + switch (tunnel_type) { + case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */ + case BGP_PMSI_TUNNEL_PIM_BIDIR: + ND_TCHECK_8(tptr); + ND_PRINT("\n\t Sender %s, P-Group %s", + ipaddr_string(ndo, tptr), + ipaddr_string(ndo, tptr+4)); + break; - while (tlen >= 3) { + case BGP_PMSI_TUNNEL_PIM_SSM: + ND_TCHECK_8(tptr); + ND_PRINT("\n\t Root-Node %s, P-Group %s", + ipaddr_string(ndo, tptr), + ipaddr_string(ndo, tptr+4)); + break; + case BGP_PMSI_TUNNEL_INGRESS: + ND_TCHECK_4(tptr); + ND_PRINT("\n\t Tunnel-Endpoint %s", + ipaddr_string(ndo, tptr)); + break; + case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */ + case BGP_PMSI_TUNNEL_LDP_MP2MP: + ND_TCHECK_8(tptr); + ND_PRINT("\n\t Root-Node %s, LSP-ID 0x%08x", + ipaddr_string(ndo, tptr), + GET_BE_U_4(tptr + 4)); + break; + case BGP_PMSI_TUNNEL_RSVP_P2MP: + ND_TCHECK_8(tptr); + ND_PRINT("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x", + ipaddr_string(ndo, tptr), + GET_BE_U_4(tptr + 4)); + break; + default: + if (ndo->ndo_vflag <= 1) { + print_unknown_data(ndo, tptr, "\n\t ", tlen); + } + } + break; + } + case BGPTYPE_AIGP: + { + uint8_t type; + uint16_t length; - type = *tptr; - length = EXTRACT_16BITS(tptr+1); + tlen = len; - ND_PRINT((ndo, "\n\t %s TLV (%u), length %u", - tok2str(bgp_aigp_values, "Unknown", type), - type, length)); + while (tlen >= 3) { - /* - * Check if we can read the TLV data. - */ - ND_TCHECK2(tptr[3], length - 3); - - switch (type) { - - case BGP_AIGP_TLV: - ND_TCHECK2(tptr[3], 8); - ND_PRINT((ndo, ", metric %" PRIu64, - EXTRACT_64BITS(tptr+3))); - break; - - default: - if (ndo->ndo_vflag <= 1) { - print_unknown_data(ndo, tptr+3,"\n\t ", length-3); - } - } - - tptr += length; - tlen -= length; - } - break; - } - case BGPTYPE_ATTR_SET: - ND_TCHECK2(tptr[0], 4); - if (len < 4) - goto trunc; - ND_PRINT((ndo, "\n\t Origin AS: %s", - as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)))); - tptr+=4; - len -=4; - - while (len) { - u_int aflags, alenlen, alen; - - ND_TCHECK2(tptr[0], 2); - if (len < 2) - goto trunc; - aflags = *tptr; - atype = *(tptr + 1); - tptr += 2; - len -= 2; - alenlen = bgp_attr_lenlen(aflags, tptr); - ND_TCHECK2(tptr[0], alenlen); - if (len < alenlen) - goto trunc; - alen = bgp_attr_len(aflags, tptr); - tptr += alenlen; - len -= alenlen; - - ND_PRINT((ndo, "\n\t %s (%u), length: %u", - tok2str(bgp_attr_values, - "Unknown Attribute", atype), - atype, - alen)); - - if (aflags) { - ND_PRINT((ndo, ", Flags [%s%s%s%s", - aflags & 0x80 ? "O" : "", - aflags & 0x40 ? "T" : "", - aflags & 0x20 ? "P" : "", - aflags & 0x10 ? "E" : "")); - if (aflags & 0xf) - ND_PRINT((ndo, "+%x", aflags & 0xf)); - ND_PRINT((ndo, "]: ")); - } - /* FIXME check for recursion */ - if (!bgp_attr_print(ndo, atype, tptr, alen)) - return 0; - tptr += alen; - len -= alen; - } + ND_TCHECK_3(tptr); + + type = GET_U_1(tptr); + length = GET_BE_U_2(tptr + 1); + tptr += 3; + tlen -= 3; + + ND_PRINT("\n\t %s TLV (%u), length %u", + tok2str(bgp_aigp_values, "Unknown", type), + type, length); + + if (length < 3) + goto trunc; + length -= 3; + + /* + * Check if we can read the TLV data. + */ + ND_TCHECK_LEN(tptr + 3, length); + if (tlen < length) + goto trunc; + + switch (type) { + + case BGP_AIGP_TLV: + if (length < 8) + goto trunc; + ND_PRINT(", metric %" PRIu64, + GET_BE_U_8(tptr)); break; - case BGPTYPE_LARGE_COMMUNITY: - if (len == 0 || len % 12) { - ND_PRINT((ndo, "invalid len")); - break; - } - ND_PRINT((ndo, "\n\t ")); - while (len > 0) { - ND_TCHECK2(*tptr, 12); - ND_PRINT((ndo, "%u:%u:%u%s", - EXTRACT_32BITS(tptr), - EXTRACT_32BITS(tptr + 4), - EXTRACT_32BITS(tptr + 8), - (len > 12) ? ", " : "")); - tptr += 12; - len -= 12; - } - break; - default: - ND_TCHECK2(*pptr,len); - ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */ - if (ndo->ndo_vflag <= 1) - print_unknown_data(ndo, pptr, "\n\t ", len); + default: + if (ndo->ndo_vflag <= 1) { + print_unknown_data(ndo, tptr,"\n\t ", length); + } + } + + tptr += length; + tlen -= length; + } + break; + } + case BGPTYPE_ATTR_SET: + ND_TCHECK_4(tptr); + if (len < 4) + goto trunc; + ND_PRINT("\n\t Origin AS: %s", + as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr))); + tptr += 4; + len -= 4; + + while (len) { + u_int aflags, alenlen, alen; + + ND_TCHECK_2(tptr); + if (len < 2) { + ND_PRINT(" [path attr too short]"); + tptr += len; + break; + } + aflags = GET_U_1(tptr); + atype = GET_U_1(tptr + 1); + tptr += 2; + len -= 2; + alenlen = bgp_attr_lenlen(aflags, tptr); + ND_TCHECK_LEN(tptr, alenlen); + if (len < alenlen) { + ND_PRINT(" [path attr too short]"); + tptr += len; + break; + } + alen = bgp_attr_len(aflags, tptr); + tptr += alenlen; + len -= alenlen; + + ND_PRINT("\n\t %s (%u), length: %u", + tok2str(bgp_attr_values, + "Unknown Attribute", atype), + atype, + alen); + + if (aflags) { + ND_PRINT(", Flags [%s%s%s%s", + aflags & 0x80 ? "O" : "", + aflags & 0x40 ? "T" : "", + aflags & 0x20 ? "P" : "", + aflags & 0x10 ? "E" : ""); + if (aflags & 0xf) + ND_PRINT("+%x", aflags & 0xf); + ND_PRINT("]"); + } + ND_PRINT(": "); + if (len < alen) { + ND_PRINT(" [path attr too short]"); + tptr += len; + break; + } + /* + * The protocol encoding per se allows ATTR_SET to be nested + * as many times as the message can accommodate. This printer + * used to be able to recurse into ATTR_SET contents until the + * stack exhaustion, but now there is a limit on that (if live + * protocol exchange goes that many levels deep, something is + * probably wrong anyway). Feel free to refine this value if + * you can find the spec with respective normative text. + */ + if (attr_set_level == 10) + ND_PRINT("(too many nested levels, not recursing)"); + else if (!bgp_attr_print(ndo, atype, tptr, alen, attr_set_level + 1)) + return 0; + tptr += alen; + len -= alen; + } + break; + + case BGPTYPE_LARGE_COMMUNITY: + if (len == 0 || len % 12) { + ND_PRINT("invalid len"); break; - } - if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/ - ND_TCHECK2(*pptr,len); - print_unknown_data(ndo, pptr, "\n\t ", len); } - return 1; + ND_PRINT("\n\t "); + while (len != 0) { + ND_TCHECK_LEN(tptr, 12); + ND_PRINT("%u:%u:%u%s", + GET_BE_U_4(tptr), + GET_BE_U_4(tptr + 4), + GET_BE_U_4(tptr + 8), + (len > 12) ? ", " : ""); + tptr += 12; + /* + * len will always be a multiple of 12, as per the above, + * so this will never underflow. + */ + len -= 12; + } + break; + default: + ND_TCHECK_LEN(pptr, len); + ND_PRINT("\n\t no Attribute %u decoder", atype); /* we have no decoder for the attribute */ + if (ndo->ndo_vflag <= 1) + print_unknown_data(ndo, pptr, "\n\t ", len); + break; + } +done: + if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/ + ND_TCHECK_LEN(pptr, len); + print_unknown_data(ndo, pptr, "\n\t ", len); + } + return 1; trunc: - return 0; + return 0; } static void bgp_capabilities_print(netdissect_options *ndo, - const u_char *opt, int caps_len) + const u_char *opt, u_int caps_len) { - int cap_type, cap_len, tcap_len, cap_offset; - int i = 0; - - while (i < caps_len) { - ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE); - cap_type=opt[i]; - cap_len=opt[i+1]; - tcap_len=cap_len; - ND_PRINT((ndo, "\n\t %s (%u), length: %u", - tok2str(bgp_capcode_values, "Unknown", - cap_type), - cap_type, - cap_len)); - ND_TCHECK2(opt[i+2], cap_len); - switch (cap_type) { - case BGP_CAPCODE_MP: - ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)", - tok2str(af_values, "Unknown", - EXTRACT_16BITS(opt+i+2)), - EXTRACT_16BITS(opt+i+2), - tok2str(bgp_safi_values, "Unknown", - opt[i+5]), - opt[i+5])); - break; - case BGP_CAPCODE_RESTART: - ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us", - ((opt[i+2])&0x80) ? "R" : "none", - EXTRACT_16BITS(opt+i+2)&0xfff)); - tcap_len-=2; - cap_offset=4; - while(tcap_len>=4) { - ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s", - tok2str(af_values,"Unknown", - EXTRACT_16BITS(opt+i+cap_offset)), - EXTRACT_16BITS(opt+i+cap_offset), - tok2str(bgp_safi_values,"Unknown", - opt[i+cap_offset+2]), - opt[i+cap_offset+2], - ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" )); - tcap_len-=4; - cap_offset+=4; - } - break; - case BGP_CAPCODE_RR: - case BGP_CAPCODE_RR_CISCO: - break; - case BGP_CAPCODE_AS_NEW: - - /* - * Extract the 4 byte AS number encoded. - */ - if (cap_len == 4) { - ND_PRINT((ndo, "\n\t\t 4 Byte AS %s", - as_printf(ndo, astostr, sizeof(astostr), - EXTRACT_32BITS(opt + i + 2)))); - } - break; - case BGP_CAPCODE_ADD_PATH: - cap_offset=2; - if (tcap_len == 0) { - ND_PRINT((ndo, " (bogus)")); /* length */ - break; - } - while (tcap_len > 0) { - if (tcap_len < 4) { - ND_PRINT((ndo, "\n\t\t(invalid)")); - break; - } - ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s", - tok2str(af_values,"Unknown",EXTRACT_16BITS(opt+i+cap_offset)), - EXTRACT_16BITS(opt+i+cap_offset), - tok2str(bgp_safi_values,"Unknown",opt[i+cap_offset+2]), - opt[i+cap_offset+2], - tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",opt[i+cap_offset+3]) - )); - tcap_len-=4; - cap_offset+=4; - } - break; - default: - ND_PRINT((ndo, "\n\t\tno decoder for Capability %u", - cap_type)); - if (ndo->ndo_vflag <= 1) - print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len); + u_int cap_type, cap_len, tcap_len, cap_offset; + u_int i = 0; + + while (i < caps_len) { + ND_TCHECK_LEN(opt + i, BGP_CAP_HEADER_SIZE); + cap_type=GET_U_1(opt + i); + cap_len=GET_U_1(opt + i + 1); + ND_PRINT("\n\t %s (%u), length: %u", + tok2str(bgp_capcode_values, "Unknown", cap_type), + cap_type, + cap_len); + ND_TCHECK_LEN(opt + 2 + i, cap_len); + switch (cap_type) { + case BGP_CAPCODE_MP: + /* AFI (16 bits), Reserved (8 bits), SAFI (8 bits) */ + if (cap_len < 4) { + ND_PRINT(" (too short, < 4)"); + return; + } + ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u)", + tok2str(af_values, "Unknown", GET_BE_U_2(opt + i + 2)), + GET_BE_U_2(opt + i + 2), + tok2str(bgp_safi_values, "Unknown", GET_U_1(opt + i + 5)), + GET_U_1(opt + i + 5)); + break; + case BGP_CAPCODE_ML: + cap_offset = 2; + tcap_len = cap_len; + while (tcap_len >= 4) { + ND_PRINT( "\n\t\tAFI %s (%u), SAFI %s (%u), Count: %u", + tok2str(af_values, "Unknown", + GET_BE_U_2(opt + i + cap_offset)), + GET_BE_U_2(opt + i + cap_offset), + tok2str(bgp_safi_values, "Unknown", + GET_U_1(opt + i + cap_offset + 2)), + GET_U_1(opt + i + cap_offset + 2), + GET_U_1(opt + i + cap_offset + 3)); + tcap_len -= 4; + cap_offset += 4; + } + break; + case BGP_CAPCODE_RESTART: + /* Restart Flags (4 bits), Restart Time in seconds (12 bits) */ + if (cap_len < 2) { + ND_PRINT(" (too short, < 2)"); + return; + } + tcap_len=cap_len; + ND_PRINT("\n\t\tRestart Flags: [%s], Restart Time %us", + ((GET_U_1(opt + i + 2))&0x80) ? "R" : "none", + GET_BE_U_2(opt + i + 2)&0xfff); + tcap_len-=2; + cap_offset=4; + while(tcap_len>=4) { + ND_PRINT("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s", + tok2str(af_values,"Unknown", + GET_BE_U_2(opt + i + cap_offset)), + GET_BE_U_2(opt + i + cap_offset), + tok2str(bgp_safi_values,"Unknown", + GET_U_1(opt + i + cap_offset + 2)), + GET_U_1(opt + (i + cap_offset + 2)), + ((GET_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" ); + tcap_len -= 4; + cap_offset += 4; + } + break; + case BGP_CAPCODE_RR: + case BGP_CAPCODE_LLGR: + case BGP_CAPCODE_RR_CISCO: + break; + case BGP_CAPCODE_AS_NEW: + /* + * Extract the 4 byte AS number encoded. + */ + if (cap_len < 4) { + ND_PRINT(" (too short, < 4)"); + return; + } + ND_PRINT("\n\t\t 4 Byte AS %s", + as_printf(ndo, astostr, sizeof(astostr), + GET_BE_U_4(opt + i + 2))); + break; + case BGP_CAPCODE_ADD_PATH: + if (cap_len == 0) { + ND_PRINT(" (bogus)"); /* length */ + break; + } + tcap_len=cap_len; + cap_offset=2; + while (tcap_len != 0) { + if (tcap_len < 4) { + nd_print_invalid(ndo); break; } - if (ndo->ndo_vflag > 1 && cap_len > 0) { - print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len); - } - i += BGP_CAP_HEADER_SIZE + cap_len; + ND_PRINT("\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s", + tok2str(af_values,"Unknown",GET_BE_U_2(opt + i + cap_offset)), + GET_BE_U_2(opt + i + cap_offset), + tok2str(bgp_safi_values,"Unknown",GET_U_1(opt + i + cap_offset + 2)), + GET_U_1(opt + (i + cap_offset + 2)), + tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",GET_U_1(opt + i + cap_offset + 3)) + ); + tcap_len -= 4; + cap_offset += 4; + } + break; + default: + ND_PRINT("\n\t\tno decoder for Capability %u", + cap_type); + if (ndo->ndo_vflag <= 1) + print_unknown_data(ndo, opt + i + 2, "\n\t\t", + cap_len); + break; } - return; + if (ndo->ndo_vflag > 1 && cap_len != 0) { + print_unknown_data(ndo, opt + i + 2, "\n\t\t", cap_len); + } + i += BGP_CAP_HEADER_SIZE + cap_len; + } + return; trunc: - ND_PRINT((ndo, "[|BGP]")); + nd_print_trunc(ndo); } static void bgp_open_print(netdissect_options *ndo, - const u_char *dat, int length) + const u_char *dat, u_int length) { - struct bgp_open bgpo; - struct bgp_opt bgpopt; - const u_char *opt; - int i; - - ND_TCHECK2(dat[0], BGP_OPEN_SIZE); - memcpy(&bgpo, dat, BGP_OPEN_SIZE); - - ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version)); - ND_PRINT((ndo, "my AS %s, ", - as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas)))); - ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime))); - ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgpo.bgpo_id))); - ND_PRINT((ndo, "\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) { - ND_TCHECK2(opt[i], BGP_OPT_SIZE); - memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE); - if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) { - ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len)); - break; - } - - ND_PRINT((ndo, "\n\t Option %s (%u), length: %u", - tok2str(bgp_opt_values,"Unknown", - bgpopt.bgpopt_type), - bgpopt.bgpopt_type, - bgpopt.bgpopt_len)); - - /* now let's decode the options we know*/ - switch(bgpopt.bgpopt_type) { - - case BGP_OPT_CAP: - bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE], - bgpopt.bgpopt_len); - break; - - case BGP_OPT_AUTH: - default: - ND_PRINT((ndo, "\n\t no decoder for option %u", - bgpopt.bgpopt_type)); - break; - } - i += BGP_OPT_SIZE + bgpopt.bgpopt_len; - } - return; + const struct bgp_open *bgp_open_header; + u_int optslen; + const struct bgp_opt *bgpopt; + const u_char *opt; + u_int i; + + ND_TCHECK_LEN(dat, BGP_OPEN_SIZE); + if (length < BGP_OPEN_SIZE) + goto trunc; + + bgp_open_header = (const struct bgp_open *)dat; + + ND_PRINT("\n\t Version %u, ", + GET_U_1(bgp_open_header->bgpo_version)); + ND_PRINT("my AS %s, ", + as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_2(bgp_open_header->bgpo_myas))); + ND_PRINT("Holdtime %us, ", + GET_BE_U_2(bgp_open_header->bgpo_holdtime)); + ND_PRINT("ID %s", ipaddr_string(ndo, bgp_open_header->bgpo_id)); + optslen = GET_U_1(bgp_open_header->bgpo_optlen); + ND_PRINT("\n\t Optional parameters, length: %u", optslen); + + opt = dat + BGP_OPEN_SIZE; + length -= BGP_OPEN_SIZE; + + i = 0; + while (i < optslen) { + uint8_t opt_type, opt_len; + + ND_TCHECK_LEN(opt + i, BGP_OPT_SIZE); + if (length < BGP_OPT_SIZE + i) + goto trunc; + bgpopt = (const struct bgp_opt *)(opt + i); + opt_type = GET_U_1(bgpopt->bgpopt_type); + opt_len = GET_U_1(bgpopt->bgpopt_len); + if (BGP_OPT_SIZE + i + opt_len > optslen) { + ND_PRINT("\n\t Option %u, length: %u, goes past the end of the options", + opt_type, opt_len); + break; + } + + ND_PRINT("\n\t Option %s (%u), length: %u", + tok2str(bgp_opt_values,"Unknown",opt_type), + opt_type, + opt_len); + + /* now let's decode the options we know*/ + switch(opt_type) { + + case BGP_OPT_CAP: + bgp_capabilities_print(ndo, opt + BGP_OPT_SIZE + i, + opt_len); + break; + + case BGP_OPT_AUTH: + default: + ND_PRINT("\n\t no decoder for option %u", + opt_type); + break; + } + i += BGP_OPT_SIZE + opt_len; + } + return; trunc: - ND_PRINT((ndo, "[|BGP]")); + nd_print_trunc(ndo); } static void bgp_update_print(netdissect_options *ndo, - const u_char *dat, int length) + const u_char *dat, u_int length) { - struct bgp bgp; - const u_char *p; - int withdrawn_routes_len; - int len; - int i; - - ND_TCHECK2(dat[0], BGP_SIZE); - if (length < BGP_SIZE) - goto trunc; - memcpy(&bgp, dat, BGP_SIZE); - p = dat + BGP_SIZE; /*XXX*/ - length -= BGP_SIZE; - - /* Unfeasible routes */ - ND_TCHECK2(p[0], 2); - if (length < 2) - goto trunc; - withdrawn_routes_len = EXTRACT_16BITS(p); - p += 2; - length -= 2; - if (withdrawn_routes_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. - */ - ND_TCHECK2(p[0], withdrawn_routes_len); - if (length < withdrawn_routes_len) - goto trunc; - ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len)); - p += withdrawn_routes_len; - length -= withdrawn_routes_len; - } - - ND_TCHECK2(p[0], 2); - if (length < 2) - goto trunc; - len = EXTRACT_16BITS(p); - p += 2; - length -= 2; - - if (withdrawn_routes_len == 0 && len == 0 && length == 0) { - /* No withdrawn routes, no path attributes, no NLRI */ - ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)")); - return; + const u_char *p; + u_int withdrawn_routes_len; + char buf[MAXHOSTNAMELEN + 100]; + int wpfx; + u_int len; + int i; + int add_path; + u_int path_id = 0; + + ND_TCHECK_LEN(dat, BGP_SIZE); + if (length < BGP_SIZE) + goto trunc; + p = dat + BGP_SIZE; + length -= BGP_SIZE; + + /* Unfeasible routes */ + ND_TCHECK_2(p); + if (length < 2) + goto trunc; + withdrawn_routes_len = GET_BE_U_2(p); + p += 2; + length -= 2; + if (withdrawn_routes_len > 1) { + /* + * 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. + */ + ND_TCHECK_LEN(p, withdrawn_routes_len); + if (length < withdrawn_routes_len) + goto trunc; + ND_PRINT("\n\t Withdrawn routes:"); + add_path = check_add_path(ndo, p, withdrawn_routes_len, 32); + while (withdrawn_routes_len != 0) { + if (add_path) { + if (withdrawn_routes_len < 4) { + p += withdrawn_routes_len; + length -= withdrawn_routes_len; + break; + } + path_id = GET_BE_U_4(p); + p += 4; + length -= 4; + withdrawn_routes_len -= 4; + } + wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf)); + if (wpfx == -1) { + ND_PRINT("\n\t (illegal prefix length)"); + break; + } else if (wpfx == -2) + goto trunc; + else if (wpfx == -3) + goto trunc; /* bytes left, but not enough */ + else { + ND_PRINT("\n\t %s", buf); + if (add_path) { + ND_PRINT(" Path Id: %u", path_id); + } + p += wpfx; + length -= wpfx; + withdrawn_routes_len -= wpfx; + } } + } else { + ND_TCHECK_LEN(p, withdrawn_routes_len); + if (length < withdrawn_routes_len) + goto trunc; + p += withdrawn_routes_len; + length -= withdrawn_routes_len; + } - if (len) { - /* do something more useful!*/ - while (len) { - int aflags, atype, alenlen, alen; - - ND_TCHECK2(p[0], 2); - if (len < 2) - goto trunc; - if (length < 2) - goto trunc; - aflags = *p; - atype = *(p + 1); - p += 2; - len -= 2; - length -= 2; - alenlen = bgp_attr_lenlen(aflags, p); - ND_TCHECK2(p[0], alenlen); - if (len < alenlen) - goto trunc; - if (length < alenlen) - goto trunc; - alen = bgp_attr_len(aflags, p); - p += alenlen; - len -= alenlen; - length -= alenlen; - - ND_PRINT((ndo, "\n\t %s (%u), length: %u", - tok2str(bgp_attr_values, "Unknown Attribute", - atype), - atype, - alen)); - - if (aflags) { - ND_PRINT((ndo, ", Flags [%s%s%s%s", - aflags & 0x80 ? "O" : "", - aflags & 0x40 ? "T" : "", - aflags & 0x20 ? "P" : "", - aflags & 0x10 ? "E" : "")); - if (aflags & 0xf) - ND_PRINT((ndo, "+%x", aflags & 0xf)); - ND_PRINT((ndo, "]: ")); - } - if (len < alen) - goto trunc; - if (length < alen) - goto trunc; - if (!bgp_attr_print(ndo, atype, p, alen)) - goto trunc; - p += alen; - len -= alen; - length -= alen; - } - } + ND_TCHECK_2(p); + if (length < 2) + goto trunc; + len = GET_BE_U_2(p); + p += 2; + length -= 2; - if (length) { - /* - * XXX - what if they're using the "Advertisement of - * Multiple Paths in BGP" feature: - * - * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/ - * - * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06 - */ - ND_PRINT((ndo, "\n\t Updated routes:")); - while (length) { - char buf[MAXHOSTNAMELEN + 100]; - i = decode_prefix4(ndo, p, length, buf, sizeof(buf)); - if (i == -1) { - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - break; - } else if (i == -2) - goto trunc; - else if (i == -3) - goto trunc; /* bytes left, but not enough */ - else { - ND_PRINT((ndo, "\n\t %s", buf)); - p += i; - length -= i; - } - } - } - return; + if (withdrawn_routes_len == 0 && len == 0 && length == 0) { + /* No withdrawn routes, no path attributes, no NLRI */ + ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)"); + return; + } + + if (len) { + /* do something more useful!*/ + while (len) { + uint8_t aflags, atype, alenlen; + uint16_t alen; + + ND_TCHECK_2(p); + if (length < 2) + goto trunc; + if (len < 2) { + ND_PRINT("\n\t [path attrs too short]"); + p += len; + length -= len; + break; + } + aflags = GET_U_1(p); + atype = GET_U_1(p + 1); + p += 2; + len -= 2; + length -= 2; + alenlen = bgp_attr_lenlen(aflags, p); + ND_TCHECK_LEN(p, alenlen); + if (length < alenlen) + goto trunc; + if (len < alenlen) { + ND_PRINT("\n\t [path attrs too short]"); + p += len; + length -= len; + break; + } + alen = bgp_attr_len(aflags, p); + p += alenlen; + len -= alenlen; + length -= alenlen; + + ND_PRINT("\n\t %s (%u), length: %u", + tok2str(bgp_attr_values, "Unknown Attribute", atype), + atype, + alen); + + if (aflags) { + ND_PRINT(", Flags [%s%s%s%s", + aflags & 0x80 ? "O" : "", + aflags & 0x40 ? "T" : "", + aflags & 0x20 ? "P" : "", + aflags & 0x10 ? "E" : ""); + if (aflags & 0xf) + ND_PRINT("+%x", aflags & 0xf); + ND_PRINT("]: "); + } + if (len < alen) { + ND_PRINT(" [path attrs too short]"); + p += len; + length -= len; + break; + } + if (length < alen) + goto trunc; + if (!bgp_attr_print(ndo, atype, p, alen, 0)) + goto trunc; + p += alen; + len -= alen; + length -= alen; + } + } + + if (length) { + add_path = check_add_path(ndo, p, length, 32); + ND_PRINT("\n\t Updated routes:"); + while (length != 0) { + if (add_path) { + ND_TCHECK_4(p); + if (length < 4) + goto trunc; + path_id = GET_BE_U_4(p); + p += 4; + length -= 4; + } + i = decode_prefix4(ndo, p, length, buf, sizeof(buf)); + if (i == -1) { + ND_PRINT("\n\t (illegal prefix length)"); + break; + } else if (i == -2) + goto trunc; + else if (i == -3) + goto trunc; /* bytes left, but not enough */ + else { + ND_PRINT("\n\t %s", buf); + if (add_path) { + ND_PRINT(" Path Id: %u", path_id); + } + p += i; + length -= i; + } + } + } + return; trunc: - ND_PRINT((ndo, "[|BGP]")); + nd_print_trunc(ndo); } static void bgp_notification_print(netdissect_options *ndo, - const u_char *dat, int length) + const u_char *dat, u_int length) { - struct bgp_notification bgpn; - const u_char *tptr; - uint8_t shutdown_comm_length; - uint8_t remainder_offset; - - ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE); - memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE); - - /* some little sanity checking */ - if (length= BGP_NOTIFICATION_SIZE + 7) { - tptr = dat + BGP_NOTIFICATION_SIZE; - ND_TCHECK2(*tptr, 7); - ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u", - tok2str(af_values, "Unknown", - EXTRACT_16BITS(tptr)), - EXTRACT_16BITS(tptr), - tok2str(bgp_safi_values, "Unknown", *(tptr+2)), - *(tptr+2), - EXTRACT_32BITS(tptr+3))); - } - /* - * draft-ietf-idr-shutdown describes a method to send a communication - * intended for human consumption regarding the Administrative Shutdown - */ - if ((bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT || - bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) && - length >= BGP_NOTIFICATION_SIZE + 1) { - tptr = dat + BGP_NOTIFICATION_SIZE; - ND_TCHECK2(*tptr, 1); - shutdown_comm_length = *(tptr); - remainder_offset = 0; - /* garbage, hexdump it all */ - if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN || - shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) { - ND_PRINT((ndo, ", invalid Shutdown Communication length")); - } - else if (shutdown_comm_length == 0) { - ND_PRINT((ndo, ", empty Shutdown Communication")); - remainder_offset += 1; - } - /* a proper shutdown communication */ - else { - ND_TCHECK2(*(tptr+1), shutdown_comm_length); - ND_PRINT((ndo, ", Shutdown Communication (length: %u): \"", shutdown_comm_length)); - (void)fn_printn(ndo, tptr+1, shutdown_comm_length, NULL); - ND_PRINT((ndo, "\"")); - remainder_offset += shutdown_comm_length + 1; - } - /* if there is trailing data, hexdump it */ - if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) { - ND_PRINT((ndo, ", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE))); - hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE)); - } - } - break; - default: - break; + const struct bgp_notification *bgp_notification_header; + const u_char *tptr; + uint8_t bgpn_major, bgpn_minor; + uint8_t shutdown_comm_length; + uint8_t remainder_offset; + + ND_TCHECK_LEN(dat, BGP_NOTIFICATION_SIZE); + if (lengthbgpn_major); + bgpn_minor = GET_U_1(bgp_notification_header->bgpn_minor); + + ND_PRINT(", %s (%u)", + tok2str(bgp_notify_major_values, "Unknown Error", + bgpn_major), + bgpn_major); + + switch (bgpn_major) { + + case BGP_NOTIFY_MAJOR_MSG: + ND_PRINT(", subcode %s (%u)", + tok2str(bgp_notify_minor_msg_values, "Unknown", + bgpn_minor), + bgpn_minor); + break; + case BGP_NOTIFY_MAJOR_OPEN: + ND_PRINT(", subcode %s (%u)", + tok2str(bgp_notify_minor_open_values, "Unknown", + bgpn_minor), + bgpn_minor); + break; + case BGP_NOTIFY_MAJOR_UPDATE: + ND_PRINT(", subcode %s (%u)", + tok2str(bgp_notify_minor_update_values, "Unknown", + bgpn_minor), + bgpn_minor); + break; + case BGP_NOTIFY_MAJOR_FSM: + ND_PRINT(" subcode %s (%u)", + tok2str(bgp_notify_minor_fsm_values, "Unknown", + bgpn_minor), + bgpn_minor); + break; + case BGP_NOTIFY_MAJOR_CAP: + ND_PRINT(" subcode %s (%u)", + tok2str(bgp_notify_minor_cap_values, "Unknown", + bgpn_minor), + bgpn_minor); + break; + case BGP_NOTIFY_MAJOR_CEASE: + ND_PRINT(", subcode %s (%u)", + tok2str(bgp_notify_minor_cease_values, "Unknown", + bgpn_minor), + 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_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) { + tptr = dat + BGP_NOTIFICATION_SIZE; + ND_TCHECK_7(tptr); + ND_PRINT(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u", + tok2str(af_values, "Unknown", GET_BE_U_2(tptr)), + GET_BE_U_2(tptr), + tok2str(bgp_safi_values, "Unknown", GET_U_1((tptr + 2))), + GET_U_1((tptr + 2)), + GET_BE_U_4(tptr + 3)); + } + /* + * draft-ietf-idr-shutdown describes a method to send a communication + * intended for human consumption regarding the Administrative Shutdown + */ + if ((bgpn_minor == BGP_NOTIFY_MINOR_CEASE_SHUT || + bgpn_minor == BGP_NOTIFY_MINOR_CEASE_RESET) && + length >= BGP_NOTIFICATION_SIZE + 1) { + tptr = dat + BGP_NOTIFICATION_SIZE; + ND_TCHECK_1(tptr); + shutdown_comm_length = GET_U_1(tptr); + remainder_offset = 0; + /* garbage, hexdump it all */ + if (shutdown_comm_length > BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN || + shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) { + ND_PRINT(", invalid Shutdown Communication length"); + } + else if (shutdown_comm_length == 0) { + ND_PRINT(", empty Shutdown Communication"); + remainder_offset += 1; + } + /* a proper shutdown communication */ + else { + ND_TCHECK_LEN(tptr + 1, shutdown_comm_length); + ND_PRINT(", Shutdown Communication (length: %u): \"", shutdown_comm_length); + (void)nd_printn(ndo, tptr+1, shutdown_comm_length, NULL); + ND_PRINT("\""); + remainder_offset += shutdown_comm_length + 1; + } + /* if there is trailing data, hexdump it */ + if(length - (remainder_offset + BGP_NOTIFICATION_SIZE) > 0) { + ND_PRINT(", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE)); + hex_print(ndo, "\n\t\t", tptr + remainder_offset, length - (remainder_offset + BGP_NOTIFICATION_SIZE)); + } } + break; + default: + break; + } - return; + return; trunc: - ND_PRINT((ndo, "[|BGP]")); + nd_print_trunc(ndo); } static void bgp_route_refresh_print(netdissect_options *ndo, - const u_char *pptr, int len) + const u_char *pptr, u_int len) { - const struct bgp_route_refresh *bgp_route_refresh_header; + const struct bgp_route_refresh *bgp_route_refresh_header; - ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE); + ND_TCHECK_LEN(pptr, BGP_ROUTE_REFRESH_SIZE); - /* some little sanity checking */ - if (lenafi)), - EXTRACT_16BITS(&bgp_route_refresh_header->afi), - tok2str(bgp_safi_values,"Unknown", - bgp_route_refresh_header->safi), - bgp_route_refresh_header->safi)); + ND_PRINT("\n\t AFI %s (%u), SAFI %s (%u)", + tok2str(af_values,"Unknown", + GET_BE_U_2(bgp_route_refresh_header->afi)), + GET_BE_U_2(bgp_route_refresh_header->afi), + tok2str(bgp_safi_values,"Unknown", + GET_U_1(bgp_route_refresh_header->safi)), + GET_U_1(bgp_route_refresh_header->safi)); - if (ndo->ndo_vflag > 1) { - ND_TCHECK2(*pptr, len); - print_unknown_data(ndo, pptr, "\n\t ", len); - } + if (ndo->ndo_vflag > 1) { + ND_TCHECK_LEN(pptr, len); + print_unknown_data(ndo, pptr, "\n\t ", len); + } - return; + return; trunc: - ND_PRINT((ndo, "[|BGP]")); + nd_print_trunc(ndo); } static int -bgp_header_print(netdissect_options *ndo, - const u_char *dat, int length) +bgp_pdu_print(netdissect_options *ndo, + const u_char *dat, u_int length) { - struct bgp bgp; - - ND_TCHECK2(dat[0], BGP_SIZE); - memcpy(&bgp, dat, BGP_SIZE); - ND_PRINT((ndo, "\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(ndo, dat, length); - break; - case BGP_UPDATE: - bgp_update_print(ndo, dat, length); - break; - case BGP_NOTIFICATION: - bgp_notification_print(ndo, dat, length); - break; - case BGP_KEEPALIVE: - break; - case BGP_ROUTE_REFRESH: - bgp_route_refresh_print(ndo, dat, length); - break; - default: - /* we have no decoder for the BGP message */ - ND_TCHECK2(*dat, length); - ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type)); - print_unknown_data(ndo, dat, "\n\t ", length); - break; - } - return 1; + const struct bgp *bgp_header; + uint8_t bgp_type; + + ND_TCHECK_LEN(dat, BGP_SIZE); + bgp_header = (const struct bgp *)dat; + bgp_type = GET_U_1(bgp_header->bgp_type); + + ND_PRINT("\n\t%s Message (%u), length: %u", + tok2str(bgp_msg_values, "Unknown", bgp_type), + bgp_type, + length); + + switch (bgp_type) { + case BGP_OPEN: + bgp_open_print(ndo, dat, length); + break; + case BGP_UPDATE: + bgp_update_print(ndo, dat, length); + break; + case BGP_NOTIFICATION: + bgp_notification_print(ndo, dat, length); + break; + case BGP_KEEPALIVE: + break; + case BGP_ROUTE_REFRESH: + bgp_route_refresh_print(ndo, dat, length); + break; + default: + /* we have no decoder for the BGP message */ + ND_TCHECK_LEN(dat, length); + ND_PRINT("\n\t no Message %u decoder", bgp_type); + print_unknown_data(ndo, dat, "\n\t ", length); + break; + } + return 1; trunc: - ND_PRINT((ndo, "[|BGP]")); - return 0; + nd_print_trunc(ndo); + return 0; } void bgp_print(netdissect_options *ndo, - const u_char *dat, int length) + const u_char *dat, u_int length _U_) { - 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; - uint16_t hlen; - - ep = dat + length; - if (ndo->ndo_snapend < dat + length) - ep = ndo->ndo_snapend; - - ND_PRINT((ndo, ": BGP")); - - if (ndo->ndo_vflag < 1) /* lets be less chatty */ - return; + const u_char *p; + const u_char *ep = ndo->ndo_snapend; + const u_char *start; + const u_char marker[] = { + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + }; + const struct bgp *bgp_header; + uint16_t hlen; + + ndo->ndo_protocol = "bgp"; + ND_PRINT(": BGP"); + + if (ndo->ndo_vflag < 1) /* lets be less chatty */ + return; - p = dat; - start = p; - while (p < ep) { - if (!ND_TTEST2(p[0], 1)) - break; - if (p[0] != 0xff) { - p++; - continue; - } - - if (!ND_TTEST2(p[0], sizeof(marker))) - break; - if (memcmp(p, marker, sizeof(marker)) != 0) { - p++; - continue; - } - - /* found BGP header */ - ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/ - memcpy(&bgp, p, BGP_SIZE); - - if (start != p) - ND_PRINT((ndo, " [|BGP]")); - - hlen = ntohs(bgp.bgp_len); - if (hlen < BGP_SIZE) { - ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen, - BGP_SIZE)); - break; - } - - if (ND_TTEST2(p[0], hlen)) { - if (!bgp_header_print(ndo, p, hlen)) - return; - p += hlen; - start = p; - } else { - ND_PRINT((ndo, "\n[|BGP %s]", - tok2str(bgp_msg_values, - "Unknown Message Type", - bgp.bgp_type))); - break; - } - } + p = dat; + start = p; + while (p < ep) { + if (!ND_TTEST_1(p)) + break; + if (GET_U_1(p) != 0xff) { + p++; + continue; + } + + if (!ND_TTEST_LEN(p, sizeof(marker))) + break; + if (memcmp(p, marker, sizeof(marker)) != 0) { + p++; + continue; + } - return; + /* found BGP header */ + ND_TCHECK_LEN(p, BGP_SIZE); + bgp_header = (const struct bgp *)p; + + if (start != p) + nd_print_trunc(ndo); + + hlen = GET_BE_U_2(bgp_header->bgp_len); + if (hlen < BGP_SIZE) { + ND_PRINT("\nmessage length %u < %u", hlen, BGP_SIZE); + nd_print_invalid(ndo); + break; + } + + if (ND_TTEST_LEN(p, hlen)) { + if (!bgp_pdu_print(ndo, p, hlen)) + return; + p += hlen; + start = p; + } else { + ND_PRINT("\n[|BGP %s]", + tok2str(bgp_msg_values, + "Unknown Message Type", + GET_U_1(bgp_header->bgp_type))); + break; + } + } + + return; trunc: - ND_PRINT((ndo, " [|BGP]")); + nd_print_trunc(ndo); } - -/* - * Local Variables: - * c-style: whitesmith - * c-basic-offset: 4 - * End: - */