X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/ae1a0ebcd662b1d1f5f66b89c4b94ac090143282..d2777156522f139a858bd6b5b51e364826bc95a7:/print-bgp.c diff --git a/print-bgp.c b/print-bgp.c index 959832be..e13fdd91 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 @@ -110,9 +112,9 @@ struct bgp_route_refresh { #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_BE_U_2(p) : EXTRACT_U_1(p)) + (((flags) & 0x10) ? GET_BE_U_2(p) : GET_U_1(p)) #define BGPTYPE_ORIGIN 1 #define BGPTYPE_AS_PATH 2 @@ -129,20 +131,20 @@ struct bgp_route_refresh { #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 */ +#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} }; @@ -257,12 +263,10 @@ static const struct tok bgp_notify_major_values[] = { { 0, NULL} }; -/* draft-ietf-idr-cease-subcode-02 */ +/* RFC 4486 */ #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1 -/* draft-ietf-idr-shutdown-07 */ #define BGP_NOTIFY_MINOR_CEASE_SHUT 2 #define BGP_NOTIFY_MINOR_CEASE_RESET 4 -#define BGP_NOTIFY_MINOR_CEASE_ADMIN_SHUTDOWN_LEN 128 static const struct tok bgp_notify_minor_cease_values[] = { { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"}, { BGP_NOTIFY_MINOR_CEASE_SHUT, "Administrative Shutdown"}, @@ -376,6 +380,8 @@ 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 +401,7 @@ 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"}, @@ -408,7 +415,7 @@ static const struct tok bgp_safi_values[] = { #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) */ @@ -424,6 +431,7 @@ static const struct tok bgp_safi_values[] = { #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 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 compatibility */ @@ -435,7 +443,7 @@ 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 */ +/* 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 @@ -463,15 +471,16 @@ 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 +488,46 @@ 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 */ @@ -506,7 +555,7 @@ static const struct tok bgp_add_path_recvsend[] = { { 0, NULL }, }; -static char astostr[20]; +#define AS_STR_SIZE sizeof("xxxxx.xxxxx") /* * as_printf @@ -519,7 +568,7 @@ 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); @@ -533,47 +582,43 @@ as_printf(netdissect_options *ndo, 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; + nd_ipv4 addr; u_int plen, plenbytes; - ND_TCHECK_1(pptr); ITEMCHECK(1); - plen = EXTRACT_U_1(pptr); + 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); + GET_CPY_BYTES(&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); + snprintf(buf, buflen, "%s/%u", ipaddr_string(ndo, (const u_char *)&addr), plen); return 1 + plenbytes; -trunc: - return -2; - badtlv: - return -3; + return -2; } 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; + nd_ipv4 addr; u_int plen, plenbytes; /* prefix length and label = 4 bytes */ ND_TCHECK_4(pptr); ITEMCHECK(4); - plen = EXTRACT_U_1(pptr); /* get prefix length */ + plen = GET_U_1(pptr); /* get prefix length */ /* this is one of the weirdnesses of rfc3107 the label length (actually the label + COS bits) @@ -594,18 +639,17 @@ decode_labeled_prefix4(netdissect_options *ndo, memset(&addr, 0, sizeof(addr)); plenbytes = (plen + 7) / 8; - ND_TCHECK_LEN(pptr + 4, plenbytes); ITEMCHECK(plenbytes); - memcpy(&addr, pptr + 4, plenbytes); + GET_CPY_BYTES(&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), + snprintf(buf, buflen, "%s/%u, label:%u %s", + ipaddr_string(ndo, (const u_char *)&addr), plen, - EXTRACT_BE_U_3(pptr + 1)>>4, - ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); + GET_BE_U_3(pptr + 1)>>4, + ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); return 4 + plenbytes; @@ -619,7 +663,7 @@ badtlv: /* * bgp_vpn_ip_print * - * print an ipv4 or ipv6 address into a buffer dependend on address length. + * print an ipv4 or ipv6 address into a buffer dependent on address length. */ static char * bgp_vpn_ip_print(netdissect_options *ndo, @@ -631,13 +675,11 @@ bgp_vpn_ip_print(netdissect_options *ndo, char *pos = addr; switch(addr_length) { - case (sizeof(struct in_addr) << 3): /* 32 */ - ND_TCHECK_LEN(pptr, sizeof(struct in_addr)); - snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr)); + case (sizeof(nd_ipv4) << 3): /* 32 */ + snprintf(pos, sizeof(addr), "%s", GET_IPADDR_STRING(pptr)); break; - case (sizeof(struct in6_addr) << 3): /* 128 */ - ND_TCHECK_LEN(pptr, sizeof(struct in6_addr)); - snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr)); + case (sizeof(nd_ipv6) << 3): /* 128 */ + snprintf(pos, sizeof(addr), "%s", GET_IP6ADDR_STRING(pptr)); break; default: snprintf(pos, sizeof(addr), "bogus address length %u", addr_length); @@ -645,7 +687,6 @@ bgp_vpn_ip_print(netdissect_options *ndo, } pos += strlen(pos); -trunc: *(pos) = '\0'; return (addr); } @@ -668,9 +709,9 @@ 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; @@ -678,14 +719,13 @@ bgp_vpn_sg_print(netdissect_options *ndo, total_length = 0; /* Source address length, encoded in bits */ - ND_TCHECK_1(pptr); - addr_length = EXTRACT_U_1(pptr); + addr_length = GET_U_1(pptr); pptr++; /* Source address */ 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)); @@ -693,14 +733,13 @@ bgp_vpn_sg_print(netdissect_options *ndo, } /* Group address length, encoded in bits */ - ND_TCHECK_1(pptr); - addr_length = EXTRACT_U_1(pptr); + addr_length = GET_U_1(pptr); pptr++; /* Group address */ 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)); @@ -711,44 +750,44 @@ 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 */ - static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")]; + static char rd[sizeof("xxxxx.xxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")]; char *pos = rd; + /* allocate space for the largest possible string */ + char astostr[AS_STR_SIZE]; /* ok lets load the RD format */ - switch (EXTRACT_BE_U_2(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_BE_U_2(pptr + 2), - EXTRACT_BE_U_4(pptr + 4), - EXTRACT_U_1(pptr + 4), EXTRACT_U_1(pptr + 5), - EXTRACT_U_1(pptr + 6), EXTRACT_U_1(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", - EXTRACT_U_1(pptr + 2), EXTRACT_U_1(pptr + 3), - EXTRACT_U_1(pptr + 4), EXTRACT_U_1(pptr + 5), - EXTRACT_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; - /* 4-byte-AS:number fmt*/ case 2: + /* 4-byte-AS:number fmt */ snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)", - as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(pptr + 2)), - EXTRACT_BE_U_2(pptr + 6), EXTRACT_U_1(pptr + 2), - EXTRACT_U_1(pptr + 3), EXTRACT_U_1(pptr + 4), - EXTRACT_U_1(pptr + 5), EXTRACT_BE_U_2(pptr + 6)); + 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"); @@ -759,17 +798,205 @@ 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; + /* allocate space for the largest possible string */ + char astostr[AS_STR_SIZE]; + + 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), + GET_IPADDR_STRING(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", + GET_IPADDR_STRING(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 + 4); + 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", GET_IPADDR_STRING(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", + GET_IPADDR_STRING(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; + } +} + +/* + * RFC4684 (Section 4)/RFC2858 (Section 4). + * RTC membership prefix is structured as follows + * [prefix-len] [origin-as] [route-target] + * The route-target is encoded as RT ext-comms. + * Prefix-len may be 0, 32..96 + * + * Note that pptr is not packet data - it is + * a buffer owned by our caller - therefore GET_* + * macros can not be used. + */ +static char * +bgp_rt_prefix_print(netdissect_options *ndo, + const u_char *pptr, + u_int plen) +{ + /* allocate space for the largest possible string */ + char rtc_prefix_in_hex[sizeof("0000 0000 0000 0000")] = ""; + u_int rtc_prefix_in_hex_len = 0; + static char output[61]; /* max response string */ + /* allocate space for the largest possible string */ + char astostr[AS_STR_SIZE]; + uint16_t ec_type = 0; + u_int octet_count; + u_int i; + + if (plen == 0) { + snprintf(output, sizeof(output), "route-target: 0:0/0"); + return (output); + } + + /* hex representation of the prefix */ + octet_count = (plen+7)/8; + for (i=0; i plen) + if (32 > plen) { + ND_PRINT("\n\t (illegal prefix length)"); return -1; + } /* With at least "origin AS", possibly with "route target". */ - ND_TCHECK_4(pptr + 1); - as_printf(ndo, asbuf, sizeof(asbuf), EXTRACT_BE_U_4(pptr + 1)); + as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(pptr + 1)); plen -= 32; /* adjust prefix length */ - if (64 < plen) + if (64 < plen) { + ND_PRINT("\n\t (illegal prefix length)"); return -1; + } /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 } * and gives the number of octets in the variable-length "route * target" field inside this NLRI "prefix". Look for it. */ memset(&route_target, 0, sizeof(route_target)); - ND_TCHECK_LEN(pptr + 5, (plen + 7) / 8); - memcpy(&route_target, pptr + 5, (plen + 7) / 8); - /* Which specification says to do this? */ + num_octets = (plen + 7) / 8; + GET_CPY_BYTES(&route_target, pptr + 5, num_octets); + /* If mask-len is not on octet boundary, ensure all extra bits are 0 */ if (plen % 8) { - ((u_char *)&route_target)[(plen + 7) / 8 - 1] &= + ((u_char *)&route_target)[num_octets - 1] &= ((0xff00 >> (plen % 8)) & 0xff); } - snprintf(buf, buflen, "origin AS: %s, route target %s", - asbuf, - bgp_vpn_rd_print(ndo, (u_char *)&route_target)); - - return 5 + (plen + 7) / 8; + ND_PRINT("\n\t origin AS: %s, %s", + astostr, + bgp_rt_prefix_print(ndo, (u_char *)&route_target, plen)); -trunc: - return -2; + return 5 + num_octets; } 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; + nd_ipv4 addr; u_int plen; - ND_TCHECK_1(pptr); - plen = EXTRACT_U_1(pptr); /* get prefix length */ + plen = GET_U_1(pptr); /* get prefix length */ if ((24+64) > plen) return -1; @@ -834,24 +1060,20 @@ decode_labeled_vpn_prefix4(netdissect_options *ndo, return -1; memset(&addr, 0, sizeof(addr)); - ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8); - memcpy(&addr, pptr + 12, (plen + 7) / 8); + GET_CPY_BYTES(&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_BE_U_3(pptr + 1)>>4, - ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); + 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; - -trunc: - return -2; } /* @@ -868,15 +1090,13 @@ 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_1(pptr); - /* if the NLRI is not predefined length, quit.*/ - if (EXTRACT_U_1(pptr) != MDT_VPN_NLRI_LEN * 8) + if (GET_U_1(pptr) != MDT_VPN_NLRI_LEN * 8) return -1; pptr++; @@ -886,15 +1106,12 @@ decode_mdt_vpn_nlri(netdissect_options *ndo, pptr += 8; /* IPv4 address */ - ND_TCHECK_LEN(pptr, sizeof(struct in_addr)); vpn_ip = pptr; - pptr += sizeof(struct in_addr); + pptr += sizeof(nd_ipv4); /* MDT Group Address */ - ND_TCHECK_LEN(pptr, sizeof(struct in_addr)); - 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), GET_IPADDR_STRING(vpn_ip), GET_IPADDR_STRING(pptr)); return MDT_VPN_NLRI_LEN + 1; @@ -923,15 +1140,17 @@ static const struct tok bgp_multicast_vpn_route_type_values[] = { 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; + /* allocate space for the largest possible string */ + char astostr[AS_STR_SIZE]; + uint8_t route_type, route_length; + u_int addr_length, sg_length; u_int offset; - ND_TCHECK_2(pptr); - route_type = EXTRACT_U_1(pptr); + route_type = GET_U_1(pptr); pptr++; - route_length = EXTRACT_U_1(pptr); + route_length = GET_U_1(pptr); pptr++; snprintf(buf, buflen, "Route-Type: %s (%u), length: %u", @@ -942,42 +1161,42 @@ decode_multicast_vpn(netdissect_options *ndo, switch(route_type) { case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI: ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN); - offset = strlen(buf); + 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)); + 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 = strlen(buf); + 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), - EXTRACT_BE_U_4(pptr + BGP_VPN_RD_LEN))); + GET_BE_U_4(pptr + BGP_VPN_RD_LEN))); break; case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI: ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN); - offset = strlen(buf); + offset = (u_int)strlen(buf); snprintf(buf + offset, buflen - offset, ", RD: %s", - bgp_vpn_rd_print(ndo, pptr)); + 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; ND_TCHECK_LEN(pptr, addr_length); - offset = strlen(buf); + offset = (u_int)strlen(buf); snprintf(buf + offset, buflen - offset, ", Originator %s", - bgp_vpn_ip_print(ndo, pptr, addr_length << 3)); + bgp_vpn_ip_print(ndo, pptr, addr_length << 3)); break; case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE: ND_TCHECK_LEN(pptr, BGP_VPN_RD_LEN); - offset = strlen(buf); + offset = (u_int)strlen(buf); snprintf(buf + offset, buflen - offset, ", RD: %s", - bgp_vpn_rd_print(ndo, pptr)); + bgp_vpn_rd_print(ndo, pptr)); pptr += BGP_VPN_RD_LEN; bgp_vpn_sg_print(ndo, pptr, buf, buflen); @@ -986,11 +1205,11 @@ decode_multicast_vpn(netdissect_options *ndo, 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 = strlen(buf); + 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), - EXTRACT_BE_U_4(pptr + BGP_VPN_RD_LEN))); + 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); @@ -1032,89 +1251,105 @@ trunc: 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; + u_int plen, tlen, tlv_type, tlv_len, ttlv_len; + int stringlen; - ND_TCHECK_2(pptr); - plen=EXTRACT_BE_U_2(pptr); - tlen=plen; + 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) { + 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) - ); + buf[0] = '\0'; + stringlen = snprintf(buf, buflen, "RD: %s, BGPNH: %s", + bgp_vpn_rd_print(ndo, pptr), + GET_IPADDR_STRING(pptr+8)); UPDATE_BUF_BUFLEN(buf, buflen, stringlen); - pptr+=12; - tlen-=12; - return plen; - } else if (plen>17) { + 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), - EXTRACT_BE_U_2(pptr + 8), - EXTRACT_BE_U_2(pptr + 10), - EXTRACT_BE_U_3(pptr + 12)>>4); /* the label is offsetted by 4 bits so lets shift it right */ + 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; + pptr += 15; + tlen -= 15; /* ok now the variable part - lets read out TLVs*/ - while (tlen>0) { - if (tlen < 3) - return -1; - ND_TCHECK_3(pptr); - tlv_type=EXTRACT_U_1(pptr); + 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; + } + tlv_type = GET_U_1(pptr); pptr++; - tlv_len=EXTRACT_BE_U_2(pptr); - ttlv_len=tlv_len; - pptr+=2; + 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) { + if (buflen != 0) { stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x", - tlv_type, - tlv_len); + 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) { + 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) { + if (buflen != 0) { stringlen=snprintf(buf,buflen, "%02x", - EXTRACT_U_1(pptr)); + GET_U_1(pptr)); pptr++; UPDATE_BUF_BUFLEN(buf, buflen, stringlen); } ttlv_len--; + tlen--; } break; default: - if (buflen!=0) { + if (buflen != 0) { stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u", - tlv_type, - tlv_len); + 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; } - tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */ } - return plen+2; - + return plen + 2; } else { /* complain bitterly ? */ /* fall through */ @@ -1127,48 +1362,43 @@ trunc: 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; + nd_ipv6 addr; u_int plen, plenbytes; - ND_TCHECK_1(pd); ITEMCHECK(1); - plen = EXTRACT_U_1(pd); + 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); + GET_CPY_BYTES(&addr, pd + 1, plenbytes); if (plen % 8) { - addr.s6_addr[plenbytes - 1] &= + addr[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff); } - snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen); + snprintf(buf, buflen, "%s/%u", ip6addr_string(ndo, (const u_char *)&addr), plen); return 1 + plenbytes; -trunc: - return -2; - badtlv: - return -3; + return -2; } 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; + nd_ipv6 addr; u_int plen, plenbytes; /* prefix length and label = 4 bytes */ ND_TCHECK_4(pptr); ITEMCHECK(4); - plen = EXTRACT_U_1(pptr); /* get prefix length */ + plen = GET_U_1(pptr); /* get prefix length */ if (24 > plen) return -1; @@ -1181,18 +1411,17 @@ decode_labeled_prefix6(netdissect_options *ndo, memset(&addr, 0, sizeof(addr)); plenbytes = (plen + 7) / 8; - ND_TCHECK_LEN(pptr + 4, plenbytes); - memcpy(&addr, pptr + 4, plenbytes); + GET_CPY_BYTES(&addr, pptr + 4, plenbytes); if (plen % 8) { - addr.s6_addr[plenbytes - 1] &= + 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_BE_U_3(pptr + 1)>>4, - ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); + 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; @@ -1205,13 +1434,12 @@ badtlv: 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; + nd_ipv6 addr; u_int plen; - ND_TCHECK_1(pptr); - plen = EXTRACT_U_1(pptr); /* get prefix length */ + plen = GET_U_1(pptr); /* get prefix length */ if ((24+64) > plen) return -1; @@ -1222,65 +1450,56 @@ decode_labeled_vpn_prefix6(netdissect_options *ndo, return -1; memset(&addr, 0, sizeof(addr)); - ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8); - memcpy(&addr, pptr + 12, (plen + 7) / 8); + GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8); if (plen % 8) { - addr.s6_addr[(plen + 7) / 8 - 1] &= + 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_BE_U_3(pptr + 1)>>4, - ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); + 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; - -trunc: - 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; - ND_TCHECK_1(pptr); - plen = EXTRACT_U_1(pptr); /* get prefix length */ + plen = GET_U_1(pptr); /* get prefix length */ if (152 < plen) return -1; memset(&addr, 0, sizeof(addr)); - ND_TCHECK_LEN(pptr + 4, (plen + 7) / 8); - memcpy(&addr, pptr + 4, (plen + 7) / 8); + GET_CPY_BYTES(&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); + /* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */ + snprintf(buf, buflen, "%s/%u", + isonsap_string(ndo, addr,(plen + 7) / 8), + plen); return 1 + (plen + 7) / 8; - -trunc: - 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; - ND_TCHECK_1(pptr); - plen = EXTRACT_U_1(pptr); /* get prefix length */ + plen = GET_U_1(pptr); /* get prefix length */ if ((24+64) > plen) return -1; @@ -1291,24 +1510,20 @@ decode_labeled_vpn_clnp_prefix(netdissect_options *ndo, return -1; memset(&addr, 0, sizeof(addr)); - ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8); - memcpy(&addr, pptr + 12, (plen + 7) / 8); + GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8); if (plen % 8) { - addr[(plen + 7) / 8 - 1] &= - ((0xff00 >> (plen % 8)) & 0xff); + 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_BE_U_3(pptr + 1)>>4, - ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); + /* Cannot use GET_ISONSAP_STRING (not packet buffer pointer) */ + 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; - -trunc: - return -2; } /* @@ -1318,9 +1533,9 @@ 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; @@ -1338,16 +1553,13 @@ bgp_attr_get_as_size(netdissect_options *ndo, * each. */ while (tptr < pptr + len) { - ND_TCHECK_1(tptr); - /* * If we do not find a valid segment type, our guess might be wrong. */ - if (EXTRACT_U_1(tptr) < BGP_AS_SEG_TYPE_MIN || EXTRACT_U_1(tptr) > 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_1(tptr + 1); - tptr += 2 + EXTRACT_U_1(tptr + 1) * 2; + tptr += 2 + GET_U_1(tptr + 1) * 2; } /* @@ -1369,197 +1581,92 @@ trunc: 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; + u_int offset, prefix_length; - switch (atype) { - case BGPTYPE_ORIGIN: - if (len != 1) - ND_PRINT((ndo, "invalid len")); - else { - ND_TCHECK_1(tptr); - ND_PRINT((ndo, "%s", tok2str(bgp_origin_values, - "Unknown Origin Typecode", - EXTRACT_U_1(tptr)))); - } - break; + if (length < 5) { + return 0; + } /* - * Process AS4 byte path and AS2 byte path attributes here. + * Scan through the NLRI information under the assumpetion that + * it doesn't have path IDs. */ - case BGPTYPE_AS4_PATH: - case BGPTYPE_AS_PATH: - if (len % 2) { - ND_PRINT((ndo, "invalid len")); - break; - } - if (!len) { - ND_PRINT((ndo, "empty")); + 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); /* - * 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. + * Add 4 to cover the path id + * and check the prefix length isn't greater than 32/128. */ - as_size = bgp_attr_get_as_size(ndo, atype, pptr, len); - - while (tptr < pptr + len) { - ND_TCHECK_1(tptr); - ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values, - "?", EXTRACT_U_1(tptr)))); - ND_TCHECK_1(tptr + 1); - for (i = 0; i < tptr[1] * as_size; i += as_size) { - ND_TCHECK_LEN(tptr + 2 + i, as_size); - ND_PRINT((ndo, "%s ", - as_printf(ndo, astostr, sizeof(astostr), - as_size == 2 ? - EXTRACT_BE_U_2(tptr + i + 2) : - EXTRACT_BE_U_4(tptr + i + 2)))); - } - ND_TCHECK_1(tptr); - ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values, - "?", EXTRACT_U_1(tptr)))); - ND_TCHECK_1(tptr + 1); - tptr += 2 + EXTRACT_U_1(tptr + 1) * as_size; - } - break; - case BGPTYPE_NEXT_HOP: - if (len != 4) - ND_PRINT((ndo, "invalid len")); - else { - ND_TCHECK_4(tptr); - 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_TCHECK_4(tptr); - ND_PRINT((ndo, "%u", EXTRACT_BE_U_4(tptr))); + if (prefix_length > max_prefix_length) { + return 0; } - break; - case BGPTYPE_ATOMIC_AGGREGATE: - if (len != 0) - ND_PRINT((ndo, "invalid len")); - break; - case BGPTYPE_AGGREGATOR: + /* 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; + } - /* - * 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; - } - ND_TCHECK_LEN(tptr, len); - if (len == 6) { - ND_PRINT((ndo, " AS #%s, origin %s", - as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(tptr)), - ipaddr_string(ndo, tptr + 2))); - } else { - ND_PRINT((ndo, " AS #%s, origin %s", - as_printf(ndo, astostr, sizeof(astostr), - EXTRACT_BE_U_4(tptr)), ipaddr_string(ndo, tptr + 4))); - } - break; - case BGPTYPE_AGGREGATOR4: - if (len != 8) { - ND_PRINT((ndo, "invalid len")); - break; - } - ND_TCHECK_8(tptr); - ND_PRINT((ndo, " AS #%s, origin %s", - as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(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_TCHECK_4(tptr); - comm = EXTRACT_BE_U_4(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_TCHECK_4(tptr); - ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr))); - break; - case BGPTYPE_CLUSTER_LIST: - if (len % 4) { - ND_PRINT((ndo, "invalid len")); + /* 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; } - while (tlen>0) { - ND_TCHECK_4(tptr); - ND_PRINT((ndo, "%s%s", - ipaddr_string(ndo, tptr), - (tlen>4) ? ", " : "")); - tlen -=4; - tptr +=4; + 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; } - break; - case BGPTYPE_MP_REACH_NLRI: - ND_TCHECK_3(tptr); - af = EXTRACT_BE_U_2(tptr); - safi = EXTRACT_U_1(tptr + 2); + offset += 1 + ((prefix_length + 7) / 8); + } + if (offset > length) { + return 1; + } + + /* assume not add-path by default */ + return 0; +} - ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)", +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)); + safi); switch(af<<8 | safi) { case (AFNUM_INET<<8 | SAFNUM_UNICAST): @@ -1592,467 +1699,573 @@ bgp_attr_print(netdissect_options *ndo, break; default: ND_TCHECK_LEN(tptr, tlen); - ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi)); + 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); - goto done; - break; + return -1; } + return 0; +trunc: + return -2; +} - tptr +=3; - - ND_TCHECK_1(tptr); - nhlen = EXTRACT_U_1(tptr); - tlen = nhlen; - tptr++; - - 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 < sizeof(struct in_addr)) { - ND_PRINT((ndo, "invalid len")); - tlen = 0; - } else { - ND_TCHECK_LEN(tptr, 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 < sizeof(struct in_addr)+BGP_VPN_RD_LEN) { - ND_PRINT((ndo, "invalid len")); - tlen = 0; - } else { - ND_TCHECK_LEN(tptr, - 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 < sizeof(struct in6_addr)) { - ND_PRINT((ndo, "invalid len")); - tlen = 0; - } else { - ND_TCHECK_LEN(tptr, 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 < sizeof(struct in6_addr)+BGP_VPN_RD_LEN) { - ND_PRINT((ndo, "invalid len")); - tlen = 0; - } else { - ND_TCHECK_LEN(tptr, - 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 < sizeof(struct in_addr)) { - ND_PRINT((ndo, "invalid len")); - tlen = 0; - } else { - ND_TCHECK_LEN(tptr, 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_TCHECK_LEN(tptr, 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_TCHECK_LEN(tptr, 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_BE_U_4(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_BE_U_3(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_TCHECK_LEN(tptr, 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_1(tptr); - snpa = EXTRACT_U_1(tptr); - tptr++; - - if (snpa) { - ND_PRINT((ndo, "\n\t %u SNPA", snpa)); - for (/*nothing*/; snpa > 0; snpa--) { - ND_TCHECK_1(tptr); - ND_PRINT((ndo, "\n\t %d bytes", EXTRACT_U_1(tptr))); - tptr += EXTRACT_U_1(tptr) + 1; - } - } else { - ND_PRINT((ndo, ", no SNPA")); - } +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; - while (tptr < pptr + len) { - switch (af<<8 | safi) { + 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 (add_path4) { + path_id = GET_BE_U_4(tptr); + tptr += 4; + } + advance = decode_prefix4(ndo, tptr, len, buf, buflen); if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); + 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((ndo, "\n\t %s", buf)); + ND_PRINT("\n\t %s", buf); + if (add_path4) { + ND_PRINT(" Path Id: %u", path_id); + advance += 4; + } break; case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): - advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf)); + advance = decode_labeled_prefix4(ndo, tptr, len, buf, buflen); if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); + 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((ndo, "\n\t %s", buf)); + 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, sizeof(buf)); + advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, buflen); if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; + ND_PRINT("\n\t (illegal prefix length)"); else - ND_PRINT((ndo, "\n\t %s", buf)); + ND_PRINT("\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)); + advance = decode_rt_routing_info(ndo, tptr); 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)); + advance = decode_multicast_vpn(ndo, tptr, buf, buflen); if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); + ND_PRINT("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else - ND_PRINT((ndo, "\n\t %s", buf)); + ND_PRINT("\n\t %s", buf); break; case (AFNUM_INET<<8 | SAFNUM_MDT): - advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf)); + advance = decode_mdt_vpn_nlri(ndo, tptr, buf, buflen); if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); + ND_PRINT("\n\t (illegal prefix length)"); else if (advance == -2) goto trunc; else - ND_PRINT((ndo, "\n\t %s", buf)); + 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): - advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf)); + 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((ndo, "\n\t (illegal prefix length)")); + 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((ndo, "\n\t %s", buf)); + ND_PRINT("\n\t %s", buf); + if (add_path6) { + ND_PRINT(" Path Id: %u", path_id); + advance += 4; + } break; case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): - advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf)); + advance = decode_labeled_prefix6(ndo, tptr, len, buf, buflen); if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); + 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((ndo, "\n\t %s", buf)); + 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, sizeof(buf)); + advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, buflen); if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; + ND_PRINT("\n\t (illegal prefix length)"); else - ND_PRINT((ndo, "\n\t %s", buf)); + 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, sizeof(buf)); + advance = decode_labeled_vpn_l2(ndo, tptr, buf, buflen); if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal length)")); + ND_PRINT("\n\t (illegal length)"); else if (advance == -2) goto trunc; else - ND_PRINT((ndo, "\n\t %s", buf)); + 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, sizeof(buf)); + advance = decode_clnp_prefix(ndo, tptr, buf, buflen); if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; + ND_PRINT("\n\t (illegal prefix length)"); else - ND_PRINT((ndo, "\n\t %s", buf)); + 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, sizeof(buf)); + advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, buflen); if (advance == -1) - ND_PRINT((ndo, "\n\t (illegal prefix length)")); - else if (advance == -2) - goto trunc; + ND_PRINT("\n\t (illegal prefix length)"); else - ND_PRINT((ndo, "\n\t %s", buf)); + ND_PRINT("\n\t %s", buf); break; default: - ND_TCHECK_LEN(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; + /* + * 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) +{ + /* allocate space for the largest possible string */ + char astostr[AS_STR_SIZE]; + 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_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_PRINT("%s", tok2str(bgp_as_path_segment_open_values, + "?", GET_U_1(tptr))); + 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_PRINT("%s", tok2str(bgp_as_path_segment_close_values, + "?", GET_U_1(tptr))); + tptr += 2 + GET_U_1(tptr + 1) * as_size; + } + break; + case BGPTYPE_NEXT_HOP: + if (len != 4) + ND_PRINT("invalid len"); + else { + ND_PRINT("%s", GET_IPADDR_STRING(tptr)); + } + break; + case BGPTYPE_MULTI_EXIT_DISC: + case BGPTYPE_LOCAL_PREF: + if (len != 4) + ND_PRINT("invalid len"); + else { + 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)), + GET_IPADDR_STRING(tptr + 2)); + } else { + ND_PRINT(" AS #%s, origin %s", + as_printf(ndo, astostr, sizeof(astostr), + GET_BE_U_4(tptr)), GET_IPADDR_STRING(tptr + 4)); + } + break; + case BGPTYPE_AGGREGATOR4: + if (len != 8) { + ND_PRINT("invalid len"); + break; + } + ND_PRINT(" AS #%s, origin %s", + as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr)), + GET_IPADDR_STRING(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_PRINT("%s",GET_IPADDR_STRING(tptr)); + break; + case BGPTYPE_CLUSTER_LIST: + if (len % 4) { + ND_PRINT("invalid len"); + break; + } + while (tlen != 0) { + if (tlen < 4) + goto trunc; + ND_PRINT("%s%s", + GET_IPADDR_STRING(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); + if (tlen < 1) + goto trunc; + 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_PRINT("%s",GET_IPADDR_STRING(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): + if (tnhlen < sizeof(nd_ipv4)+BGP_VPN_RD_LEN) { + ND_PRINT("invalid len"); + tptr += tnhlen; + tlen -= tnhlen; + tnhlen = 0; + } else { + ND_PRINT("RD: %s, %s", + bgp_vpn_rd_print(ndo, tptr), + GET_IPADDR_STRING(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_PRINT("%s", GET_IP6ADDR_STRING(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_PRINT("RD: %s, %s", + bgp_vpn_rd_print(ndo, tptr), + GET_IP6ADDR_STRING(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_PRINT("%s", GET_IPADDR_STRING(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_PRINT("%s", GET_ISONSAP_STRING(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): + 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), + GET_ISONSAP_STRING(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", GET_IPADDR_STRING(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", GET_IP6ADDR_STRING(tptr+BGP_VPN_RD_LEN+3)); + tptr += tnhlen; + tlen -= tnhlen; + tnhlen = 0; + } + break; + default: + /* + * 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); + + /* As per RFC 2858; this is reserved in RFC 4760 */ + if (tlen < 1) + goto trunc; + 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; + snpalen = GET_U_1(tptr); + ND_PRINT("\n\t %u bytes", snpalen); + tptr++; + tlen--; + if (tlen < snpalen) + goto trunc; + ND_TCHECK_LEN(tptr, snpalen); + tptr += snpalen; + tlen -= snpalen; + } + } else { + ND_PRINT(", 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 (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; } - done: break; case BGPTYPE_MP_UNREACH_NLRI: ND_TCHECK_LEN(tptr, BGP_MP_NLRI_MINSIZE); - af = EXTRACT_BE_U_2(tptr); - safi = EXTRACT_U_1(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)); + ret = bgp_mp_af_print(ndo, tptr, tlen, &af, &safi); + if (ret == -2) + goto trunc; + if (ret < 0) + break; if (len == BGP_MP_NLRI_MINSIZE) - ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)")); + 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) { - 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_TCHECK_LEN(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; - } + 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; @@ -2060,85 +2273,29 @@ bgp_attr_print(netdissect_options *ndo, break; case BGPTYPE_EXTD_COMMUNITIES: if (len % 8) { - ND_PRINT((ndo, "invalid len")); + ND_PRINT("invalid len"); break; } - while (tlen>0) { + while (tlen != 0) { uint16_t extd_comm; ND_TCHECK_2(tptr); - extd_comm=EXTRACT_BE_U_2(tptr); + if (tlen < 2) + goto trunc; + extd_comm=GET_BE_U_2(tptr); - ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]", + 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_6(tptr + 2); - 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_BE_U_2(tptr + 2), - EXTRACT_BE_U_4(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_BE_U_2(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_BE_U_4(tptr + 2)), EXTRACT_BE_U_2(tptr + 6))); - break; - case BGP_EXT_COM_LINKBAND: - bw.i = EXTRACT_BE_U_4(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)", - EXTRACT_U_1((tptr + 6))), - (EXTRACT_U_1(tptr + 7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "", - ((EXTRACT_U_1(tptr + 6) == BGP_OSPF_RTYPE_EXT) || (EXTRACT_U_1(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", - EXTRACT_U_1((tptr + 2))), - EXTRACT_U_1((tptr + 3)), - EXTRACT_BE_U_2(tptr + 4))); - break; - case BGP_EXT_COM_SOURCE_AS: - ND_PRINT((ndo, ": AS %u", EXTRACT_BE_U_2(tptr + 2))); - break; - default: - ND_TCHECK_8(tptr); - print_unknown_data(ndo, tptr, "\n\t ", 8); - break; - } + 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; } @@ -2149,15 +2306,16 @@ bgp_attr_print(netdissect_options *ndo, uint8_t tunnel_type, flags; ND_TCHECK_5(tptr); - flags = EXTRACT_U_1(tptr); - tunnel_type = EXTRACT_U_1(tptr + 1); - tlen = len; + if (tlen < 5) + goto trunc; + flags = GET_U_1(tptr); + tunnel_type = GET_U_1(tptr + 1); - ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u", + 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), - EXTRACT_BE_U_3(tptr + 2)>>4)); + GET_BE_U_3(tptr + 2)>>4); tptr +=5; tlen -= 5; @@ -2165,35 +2323,30 @@ bgp_attr_print(netdissect_options *ndo, switch (tunnel_type) { case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */ case BGP_PMSI_TUNNEL_PIM_BIDIR: - ND_TCHECK_8(tptr); - ND_PRINT((ndo, "\n\t Sender %s, P-Group %s", - ipaddr_string(ndo, tptr), - ipaddr_string(ndo, tptr+4))); + ND_PRINT("\n\t Sender %s, P-Group %s", + GET_IPADDR_STRING(tptr), + GET_IPADDR_STRING(tptr+4)); break; case BGP_PMSI_TUNNEL_PIM_SSM: - ND_TCHECK_8(tptr); - ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s", - ipaddr_string(ndo, tptr), - ipaddr_string(ndo, tptr+4))); + ND_PRINT("\n\t Root-Node %s, P-Group %s", + GET_IPADDR_STRING(tptr), + GET_IPADDR_STRING(tptr+4)); break; case BGP_PMSI_TUNNEL_INGRESS: - ND_TCHECK_4(tptr); - ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s", - ipaddr_string(ndo, tptr))); + ND_PRINT("\n\t Tunnel-Endpoint %s", + GET_IPADDR_STRING(tptr)); break; case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */ case BGP_PMSI_TUNNEL_LDP_MP2MP: - ND_TCHECK_8(tptr); - ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x", - ipaddr_string(ndo, tptr), - EXTRACT_BE_U_4(tptr + 4))); + ND_PRINT("\n\t Root-Node %s, LSP-ID 0x%08x", + GET_IPADDR_STRING(tptr), + GET_BE_U_4(tptr + 4)); break; case BGP_PMSI_TUNNEL_RSVP_P2MP: - ND_TCHECK_8(tptr); - ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x", - ipaddr_string(ndo, tptr), - EXTRACT_BE_U_4(tptr + 4))); + ND_PRINT("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x", + GET_IPADDR_STRING(tptr), + GET_BE_U_4(tptr + 4)); break; default: if (ndo->ndo_vflag <= 1) { @@ -2207,20 +2360,15 @@ bgp_attr_print(netdissect_options *ndo, uint8_t type; uint16_t length; - tlen = len; - while (tlen >= 3) { - - ND_TCHECK_3(tptr); - - type = EXTRACT_U_1(tptr); - length = EXTRACT_BE_U_2(tptr + 1); + type = GET_U_1(tptr); + length = GET_BE_U_2(tptr + 1); tptr += 3; tlen -= 3; - ND_PRINT((ndo, "\n\t %s TLV (%u), length %u", + ND_PRINT("\n\t %s TLV (%u), length %u", tok2str(bgp_aigp_values, "Unknown", type), - type, length)); + type, length); if (length < 3) goto trunc; @@ -2229,15 +2377,16 @@ bgp_attr_print(netdissect_options *ndo, /* * 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((ndo, ", metric %" PRIu64, - EXTRACT_BE_U_8(tptr))); + ND_PRINT(", metric %" PRIu64, + GET_BE_U_8(tptr)); break; default: @@ -2255,8 +2404,8 @@ bgp_attr_print(netdissect_options *ndo, ND_TCHECK_4(tptr); if (len < 4) goto trunc; - ND_PRINT((ndo, "\n\t Origin AS: %s", - as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_4(tptr)))); + ND_PRINT("\n\t Origin AS: %s", + as_printf(ndo, astostr, sizeof(astostr), GET_BE_U_4(tptr))); tptr += 4; len -= 4; @@ -2264,39 +2413,61 @@ bgp_attr_print(netdissect_options *ndo, u_int aflags, alenlen, alen; ND_TCHECK_2(tptr); - if (len < 2) - goto trunc; - aflags = EXTRACT_U_1(tptr); - atype = EXTRACT_U_1(tptr + 1); + 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) - goto trunc; + if (len < alenlen) { + ND_PRINT(" [path attr too short]"); + tptr += len; + break; + } alen = bgp_attr_len(aflags, tptr); tptr += alenlen; len -= alenlen; - ND_PRINT((ndo, "\n\t %s (%u), length: %u", + ND_PRINT("\n\t %s (%u), length: %u", tok2str(bgp_attr_values, "Unknown Attribute", atype), atype, - alen)); + alen); if (aflags) { - ND_PRINT((ndo, ", Flags [%s%s%s%s", + ND_PRINT(", Flags [%s%s%s%s", aflags & 0x80 ? "O" : "", aflags & 0x40 ? "T" : "", aflags & 0x20 ? "P" : "", - aflags & 0x10 ? "E" : "")); + aflags & 0x10 ? "E" : ""); if (aflags & 0xf) - ND_PRINT((ndo, "+%x", aflags & 0xf)); - ND_PRINT((ndo, "]: ")); + ND_PRINT("+%x", aflags & 0xf); + ND_PRINT("]"); } - /* FIXME check for recursion */ - if (!bgp_attr_print(ndo, atype, tptr, alen)) - return 0; + 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; } @@ -2304,28 +2475,32 @@ bgp_attr_print(netdissect_options *ndo, case BGPTYPE_LARGE_COMMUNITY: if (len == 0 || len % 12) { - ND_PRINT((ndo, "invalid len")); + ND_PRINT("invalid len"); break; } - ND_PRINT((ndo, "\n\t ")); - while (len > 0) { - ND_TCHECK_LEN(tptr, 12); - ND_PRINT((ndo, "%u:%u:%u%s", - EXTRACT_BE_U_4(tptr), - EXTRACT_BE_U_4(tptr + 4), - EXTRACT_BE_U_4(tptr + 8), - (len > 12) ? ", " : "")); + ND_PRINT("\n\t "); + while (len != 0) { + 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((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */ + 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); @@ -2340,91 +2515,122 @@ static void bgp_capabilities_print(netdissect_options *ndo, const u_char *opt, u_int caps_len) { + /* allocate space for the largest possible string */ + char astostr[AS_STR_SIZE]; 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=EXTRACT_U_1(opt + i); - cap_len=EXTRACT_U_1(opt + i + 1); - tcap_len=cap_len; - ND_PRINT((ndo, "\n\t %s (%u), length: %u", + 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)); + cap_len); ND_TCHECK_LEN(opt + 2 + i, 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_BE_U_2(opt + i + 2)), - EXTRACT_BE_U_2(opt + i + 2), - tok2str(bgp_safi_values, "Unknown", EXTRACT_U_1(opt + i + 5)), - EXTRACT_U_1(opt + i + 5))); + /* 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: - ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us", - ((EXTRACT_U_1(opt + i + 2))&0x80) ? "R" : "none", - EXTRACT_BE_U_2(opt + i + 2)&0xfff)); + /* 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((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s", + ND_PRINT("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s", tok2str(af_values,"Unknown", - EXTRACT_BE_U_2(opt + i + cap_offset)), - EXTRACT_BE_U_2(opt + i + cap_offset), + GET_BE_U_2(opt + i + cap_offset)), + GET_BE_U_2(opt + i + cap_offset), tok2str(bgp_safi_values,"Unknown", - EXTRACT_U_1(opt + i + cap_offset + 2)), - EXTRACT_U_1(opt + (i + cap_offset + 2)), - ((EXTRACT_U_1(opt + (i + cap_offset + 3)))&0x80) ? "yes" : "no" )); + 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((ndo, "\n\t\t 4 Byte AS %s", - as_printf(ndo, astostr, sizeof(astostr), - EXTRACT_BE_U_4(opt + i + 2)))); + 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: - cap_offset=2; - if (tcap_len == 0) { - ND_PRINT((ndo, " (bogus)")); /* length */ + if (cap_len == 0) { + ND_PRINT(" (bogus)"); /* length */ break; } - while (tcap_len > 0) { + tcap_len=cap_len; + cap_offset=2; + while (tcap_len != 0) { if (tcap_len < 4) { - ND_PRINT((ndo, "\n\t\t(invalid)")); + nd_print_invalid(ndo); break; } - ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s", - tok2str(af_values,"Unknown",EXTRACT_BE_U_2(opt + i + cap_offset)), - EXTRACT_BE_U_2(opt + i + cap_offset), - tok2str(bgp_safi_values,"Unknown",EXTRACT_U_1(opt + i + cap_offset + 2)), - EXTRACT_U_1(opt + (i + cap_offset + 2)), - tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",EXTRACT_U_1(opt + i + cap_offset + 3)) - )); + 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((ndo, "\n\t\tno decoder for Capability %u", - cap_type)); + 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; } - if (ndo->ndo_vflag > 1 && cap_len > 0) { + 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; @@ -2432,13 +2638,15 @@ bgp_capabilities_print(netdissect_options *ndo, return; trunc: - ND_PRINT((ndo, "[|BGP]")); + nd_print_trunc(ndo); } static void bgp_open_print(netdissect_options *ndo, const u_char *dat, u_int length) { + /* allocate space for the largest possible string */ + char astostr[AS_STR_SIZE]; const struct bgp_open *bgp_open_header; u_int optslen; const struct bgp_opt *bgpopt; @@ -2451,15 +2659,15 @@ bgp_open_print(netdissect_options *ndo, bgp_open_header = (const struct bgp_open *)dat; - ND_PRINT((ndo, "\n\t Version %u, ", - EXTRACT_U_1(bgp_open_header->bgpo_version))); - ND_PRINT((ndo, "my AS %s, ", - as_printf(ndo, astostr, sizeof(astostr), EXTRACT_BE_U_2(bgp_open_header->bgpo_myas)))); - ND_PRINT((ndo, "Holdtime %us, ", - EXTRACT_BE_U_2(bgp_open_header->bgpo_holdtime))); - ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgp_open_header->bgpo_id))); - optslen = EXTRACT_U_1(bgp_open_header->bgpo_optlen); - ND_PRINT((ndo, "\n\t Optional parameters, length: %u", optslen)); + 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", GET_IPADDR_STRING(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; @@ -2472,18 +2680,18 @@ bgp_open_print(netdissect_options *ndo, if (length < BGP_OPT_SIZE + i) goto trunc; bgpopt = (const struct bgp_opt *)(opt + i); - opt_type = EXTRACT_U_1(bgpopt->bgpopt_type); - opt_len = EXTRACT_U_1(bgpopt->bgpopt_len); + 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((ndo, "\n\t Option %u, length: %u, goes past the end of the options", - opt_type, opt_len)); + ND_PRINT("\n\t Option %u, length: %u, goes past the end of the options", + opt_type, opt_len); break; } - ND_PRINT((ndo, "\n\t Option %s (%u), length: %u", + ND_PRINT("\n\t Option %s (%u), length: %u", tok2str(bgp_opt_values,"Unknown",opt_type), opt_type, - opt_len)); + opt_len); /* now let's decode the options we know*/ switch(opt_type) { @@ -2495,31 +2703,33 @@ bgp_open_print(netdissect_options *ndo, case BGP_OPT_AUTH: default: - ND_PRINT((ndo, "\n\t no decoder for option %u", - opt_type)); + 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) { - const struct bgp *bgp_header; const u_char *p; - int withdrawn_routes_len; - int len; + 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; - bgp_header = (const struct bgp *)dat; p = dat + BGP_SIZE; length -= BGP_SIZE; @@ -2527,10 +2737,10 @@ bgp_update_print(netdissect_options *ndo, ND_TCHECK_2(p); if (length < 2) goto trunc; - withdrawn_routes_len = EXTRACT_BE_U_2(p); + withdrawn_routes_len = GET_BE_U_2(p); p += 2; length -= 2; - if (withdrawn_routes_len) { + 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, @@ -2539,7 +2749,40 @@ bgp_update_print(netdissect_options *ndo, ND_TCHECK_LEN(p, withdrawn_routes_len); if (length < withdrawn_routes_len) goto trunc; - ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len)); + 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; /* 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; } @@ -2547,62 +2790,78 @@ bgp_update_print(netdissect_options *ndo, ND_TCHECK_2(p); if (length < 2) goto trunc; - len = EXTRACT_BE_U_2(p); + len = GET_BE_U_2(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)")); + ND_PRINT("\n\t End-of-Rib Marker (empty NLRI)"); return; } if (len) { + /* Make sure the path attributes don't go past the end of the packet */ + if (length < len) + goto trunc; /* do something more useful!*/ while (len) { - int aflags, atype, alenlen, alen; + uint8_t aflags, atype, alenlen; + uint16_t alen; ND_TCHECK_2(p); - if (len < 2) - goto trunc; if (length < 2) goto trunc; - aflags = EXTRACT_U_1(p); - atype = EXTRACT_U_1(p + 1); + 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 (len < alenlen) - goto trunc; 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((ndo, "\n\t %s (%u), length: %u", + ND_PRINT("\n\t %s (%u), length: %u", tok2str(bgp_attr_values, "Unknown Attribute", atype), atype, - alen)); + alen); if (aflags) { - ND_PRINT((ndo, ", Flags [%s%s%s%s", + ND_PRINT(", Flags [%s%s%s%s", aflags & 0x80 ? "O" : "", aflags & 0x40 ? "T" : "", aflags & 0x20 ? "P" : "", - aflags & 0x10 ? "E" : "")); + aflags & 0x10 ? "E" : ""); if (aflags & 0xf) - ND_PRINT((ndo, "+%x", aflags & 0xf)); - ND_PRINT((ndo, "]: ")); + ND_PRINT("+%x", aflags & 0xf); + ND_PRINT("]: "); + } + if (len < alen) { + ND_PRINT(" [path attrs too short]"); + p += len; + length -= len; + break; } - if (len < alen) - goto trunc; if (length < alen) goto trunc; - if (!bgp_attr_print(ndo, atype, p, alen)) + if (!bgp_attr_print(ndo, atype, p, alen, 0)) goto trunc; p += alen; len -= alen; @@ -2611,27 +2870,28 @@ bgp_update_print(netdissect_options *ndo, } 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]; + 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((ndo, "\n\t (illegal prefix length)")); + 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((ndo, "\n\t %s", buf)); + ND_PRINT("\n\t %s", buf); + if (add_path) { + ND_PRINT(" Path Id: %u", path_id); + } p += i; length -= i; } @@ -2639,114 +2899,108 @@ bgp_update_print(netdissect_options *ndo, } 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) { 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 = EXTRACT_U_1(bgp_notification_header->bgpn_minor); + bgpn_major = GET_U_1(bgp_notification_header->bgpn_major); + bgpn_minor = GET_U_1(bgp_notification_header->bgpn_minor); - ND_PRINT((ndo, ", %s (%u)", + ND_PRINT(", %s (%u)", tok2str(bgp_notify_major_values, "Unknown Error", bgpn_major), - bgpn_major)); + bgpn_major); switch (bgpn_major) { case BGP_NOTIFY_MAJOR_MSG: - ND_PRINT((ndo, ", subcode %s (%u)", + ND_PRINT(", subcode %s (%u)", tok2str(bgp_notify_minor_msg_values, "Unknown", bgpn_minor), - bgpn_minor)); + bgpn_minor); break; case BGP_NOTIFY_MAJOR_OPEN: - ND_PRINT((ndo, ", subcode %s (%u)", + ND_PRINT(", subcode %s (%u)", tok2str(bgp_notify_minor_open_values, "Unknown", bgpn_minor), - bgpn_minor)); + bgpn_minor); break; case BGP_NOTIFY_MAJOR_UPDATE: - ND_PRINT((ndo, ", subcode %s (%u)", + ND_PRINT(", subcode %s (%u)", tok2str(bgp_notify_minor_update_values, "Unknown", bgpn_minor), - bgpn_minor)); + bgpn_minor); break; case BGP_NOTIFY_MAJOR_FSM: - ND_PRINT((ndo, " subcode %s (%u)", + ND_PRINT(" subcode %s (%u)", tok2str(bgp_notify_minor_fsm_values, "Unknown", bgpn_minor), - bgpn_minor)); + bgpn_minor); break; case BGP_NOTIFY_MAJOR_CAP: - ND_PRINT((ndo, " subcode %s (%u)", + ND_PRINT(" subcode %s (%u)", tok2str(bgp_notify_minor_cap_values, "Unknown", bgpn_minor), - bgpn_minor)); + bgpn_minor); break; case BGP_NOTIFY_MAJOR_CEASE: - ND_PRINT((ndo, ", subcode %s (%u)", + ND_PRINT(", subcode %s (%u)", tok2str(bgp_notify_minor_cease_values, "Unknown", bgpn_minor), - bgpn_minor)); + bgpn_minor); - /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes + /* RFC 4486 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((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u", - tok2str(af_values, "Unknown", EXTRACT_BE_U_2(tptr)), - EXTRACT_BE_U_2(tptr), - tok2str(bgp_safi_values, "Unknown", EXTRACT_U_1((tptr + 2))), - EXTRACT_U_1((tptr + 2)), - EXTRACT_BE_U_4(tptr + 3))); + 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 + * RFC 9003 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 = EXTRACT_U_1(tptr); - remainder_offset = 0; + uint8_t shutdown_comm_length = GET_U_1(tptr); + uint8_t 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")); + if (shutdown_comm_length > length - (BGP_NOTIFICATION_SIZE + 1)) { + ND_PRINT(", invalid Shutdown Communication length"); } else if (shutdown_comm_length == 0) { - ND_PRINT((ndo, ", empty Shutdown Communication")); + ND_PRINT(", empty Shutdown Communication"); remainder_offset += 1; } /* a proper shutdown communication */ else { - ND_TCHECK_LEN(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, "\"")); + 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((ndo, ", Data: (length: %u)", length - (remainder_offset + BGP_NOTIFICATION_SIZE))); + 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)); } } @@ -2757,12 +3011,12 @@ bgp_notification_print(netdissect_options *ndo, 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; @@ -2774,13 +3028,13 @@ bgp_route_refresh_print(netdissect_options *ndo, bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr; - ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)", + ND_PRINT("\n\t AFI %s (%u), SAFI %s (%u)", tok2str(af_values,"Unknown", - EXTRACT_BE_U_2(bgp_route_refresh_header->afi)), - EXTRACT_BE_U_2(bgp_route_refresh_header->afi), + GET_BE_U_2(bgp_route_refresh_header->afi)), + GET_BE_U_2(bgp_route_refresh_header->afi), tok2str(bgp_safi_values,"Unknown", - EXTRACT_U_1(bgp_route_refresh_header->safi)), - EXTRACT_U_1(bgp_route_refresh_header->safi))); + GET_U_1(bgp_route_refresh_header->safi)), + GET_U_1(bgp_route_refresh_header->safi)); if (ndo->ndo_vflag > 1) { ND_TCHECK_LEN(pptr, len); @@ -2789,24 +3043,24 @@ bgp_route_refresh_print(netdissect_options *ndo, return; trunc: - ND_PRINT((ndo, "[|BGP]")); + nd_print_trunc(ndo); } static int bgp_pdu_print(netdissect_options *ndo, - const u_char *dat, u_int length) + const u_char *dat, u_int length) { const struct bgp *bgp_header; uint8_t bgp_type; ND_TCHECK_LEN(dat, BGP_SIZE); bgp_header = (const struct bgp *)dat; - bgp_type = EXTRACT_U_1(bgp_header->bgp_type); + bgp_type = GET_U_1(bgp_header->bgp_type); - ND_PRINT((ndo, "\n\t%s Message (%u), length: %u", + ND_PRINT("\n\t%s Message (%u), length: %u", tok2str(bgp_msg_values, "Unknown", bgp_type), bgp_type, - length)); + length); switch (bgp_type) { case BGP_OPEN: @@ -2826,22 +3080,22 @@ bgp_pdu_print(netdissect_options *ndo, default: /* we have no decoder for the BGP message */ ND_TCHECK_LEN(dat, length); - ND_PRINT((ndo, "\n\t no Message %u decoder", bgp_type)); + 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]")); + 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 *ep = ndo->ndo_snapend; const u_char *start; const u_char marker[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, @@ -2850,11 +3104,8 @@ bgp_print(netdissect_options *ndo, const struct bgp *bgp_header; uint16_t hlen; - ep = dat + length; - if (ndo->ndo_snapend < dat + length) - ep = ndo->ndo_snapend; - - ND_PRINT((ndo, ": BGP")); + ndo->ndo_protocol = "bgp"; + ND_PRINT(": BGP"); if (ndo->ndo_vflag < 1) /* lets be less chatty */ return; @@ -2864,7 +3115,7 @@ bgp_print(netdissect_options *ndo, while (p < ep) { if (!ND_TTEST_1(p)) break; - if (EXTRACT_U_1(p) != 0xff) { + if (GET_U_1(p) != 0xff) { p++; continue; } @@ -2881,12 +3132,12 @@ bgp_print(netdissect_options *ndo, bgp_header = (const struct bgp *)p; if (start != p) - ND_PRINT((ndo, " [|BGP]")); + nd_print_trunc(ndo); - hlen = EXTRACT_BE_U_2(bgp_header->bgp_len); + hlen = GET_BE_U_2(bgp_header->bgp_len); if (hlen < BGP_SIZE) { - ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen, - BGP_SIZE)); + ND_PRINT("\nmessage length %u < %u", hlen, BGP_SIZE); + nd_print_invalid(ndo); break; } @@ -2896,10 +3147,10 @@ bgp_print(netdissect_options *ndo, p += hlen; start = p; } else { - ND_PRINT((ndo, "\n[|BGP %s]", + ND_PRINT("\n[|BGP %s]", tok2str(bgp_msg_values, "Unknown Message Type", - EXTRACT_U_1(bgp_header->bgp_type)))); + GET_U_1(bgp_header->bgp_type))); break; } } @@ -2907,12 +3158,5 @@ bgp_print(netdissect_options *ndo, return; trunc: - ND_PRINT((ndo, " [|BGP]")); + nd_print_trunc(ndo); } - -/* - * Local Variables: - * c-style: whitesmith - * c-basic-offset: 4 - * End: - */