/* * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) * distributions including binary code include the above copyright notice and * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may be used to endorse * or promote products derived from this software without specific prior * written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * OSPF support contributed by Jeffrey Honig (jch@mitchell.cit.cornell.edu) */ /* \summary: IPv6 Open Shortest Path First (OSPFv3) printer */ #ifdef HAVE_CONFIG_H #include #endif #include "netdissect-stdinc.h" #include #include "netdissect.h" #include "addrtoname.h" #include "extract.h" #include "ospf.h" #define OSPF_TYPE_HELLO 1 /* Hello */ #define OSPF_TYPE_DD 2 /* Database Description */ #define OSPF_TYPE_LS_REQ 3 /* Link State Request */ #define OSPF_TYPE_LS_UPDATE 4 /* Link State Update */ #define OSPF_TYPE_LS_ACK 5 /* Link State Ack */ /* Options *_options */ #define OSPF6_OPTION_V6 0x01 /* V6 bit: A bit for peeping tom */ #define OSPF6_OPTION_E 0x02 /* E bit: External routes advertised */ #define OSPF6_OPTION_MC 0x04 /* MC bit: Multicast capable */ #define OSPF6_OPTION_N 0x08 /* N bit: For type-7 LSA */ #define OSPF6_OPTION_R 0x10 /* R bit: Router bit */ #define OSPF6_OPTION_DC 0x20 /* DC bit: Demand circuits */ /* The field is actually 24-bit (RFC5340 Section A.2). */ #define OSPF6_OPTION_AF 0x0100 /* AF bit: Multiple address families */ #define OSPF6_OPTION_L 0x0200 /* L bit: Link-local signaling (LLS) */ #define OSPF6_OPTION_AT 0x0400 /* AT bit: Authentication trailer */ /* db_flags */ #define OSPF6_DB_INIT 0x04 /* */ #define OSPF6_DB_MORE 0x02 #define OSPF6_DB_MASTER 0x01 #define OSPF6_DB_M6 0x10 /* IPv6 MTU */ /* ls_type */ #define LS_TYPE_ROUTER 1 /* router link */ #define LS_TYPE_NETWORK 2 /* network link */ #define LS_TYPE_INTER_AP 3 /* Inter-Area-Prefix */ #define LS_TYPE_INTER_AR 4 /* Inter-Area-Router */ #define LS_TYPE_ASE 5 /* ASE */ #define LS_TYPE_GROUP 6 /* Group membership */ #define LS_TYPE_NSSA 7 /* NSSA */ #define LS_TYPE_LINK 8 /* Link LSA */ #define LS_TYPE_INTRA_AP 9 /* Intra-Area-Prefix */ #define LS_TYPE_INTRA_ATE 10 /* Intra-Area-TE */ #define LS_TYPE_GRACE 11 /* Grace LSA */ #define LS_TYPE_RI 12 /* Router information */ #define LS_TYPE_INTER_ASTE 13 /* Inter-AS-TE */ #define LS_TYPE_L1VPN 14 /* L1VPN */ #define LS_TYPE_MASK 0x1fff #define LS_SCOPE_LINKLOCAL 0x0000 #define LS_SCOPE_AREA 0x2000 #define LS_SCOPE_AS 0x4000 #define LS_SCOPE_MASK 0x6000 #define LS_SCOPE_U 0x8000 /* rla_link.link_type */ #define RLA_TYPE_ROUTER 1 /* point-to-point to another router */ #define RLA_TYPE_TRANSIT 2 /* connection to transit network */ #define RLA_TYPE_VIRTUAL 4 /* virtual link */ /* rla_flags */ #define RLA_FLAG_B 0x01 #define RLA_FLAG_E 0x02 #define RLA_FLAG_V 0x04 #define RLA_FLAG_W 0x08 #define RLA_FLAG_Nt 0x10 /* lsa_prefix options */ #define LSA_PREFIX_OPT_NU 0x01 #define LSA_PREFIX_OPT_LA 0x02 #define LSA_PREFIX_OPT_MC 0x04 #define LSA_PREFIX_OPT_P 0x08 #define LSA_PREFIX_OPT_DN 0x10 #define LSA_PREFIX_OPT_N 0x20 /* sla_tosmetric breakdown */ #define SLA_MASK_TOS 0x7f000000 #define SLA_MASK_METRIC 0x00ffffff #define SLA_SHIFT_TOS 24 /* asla_metric */ #define ASLA_FLAG_FWDADDR 0x02000000 #define ASLA_FLAG_ROUTETAG 0x01000000 #define ASLA_MASK_METRIC 0x00ffffff /* RFC6506 Section 4.1 */ #define OSPF6_AT_HDRLEN 16U #define OSPF6_AUTH_TYPE_HMAC 0x0001 typedef nd_uint32_t rtrid_t; /* link state advertisement header */ struct lsa6_hdr { nd_uint16_t ls_age; nd_uint16_t ls_type; rtrid_t ls_stateid; rtrid_t ls_router; nd_uint32_t ls_seq; nd_uint16_t ls_chksum; nd_uint16_t ls_length; }; /* Length of an IPv6 address, in bytes. */ #define IPV6_ADDR_LEN_BYTES (128/8) struct lsa6_prefix { nd_uint8_t lsa_p_len; nd_uint8_t lsa_p_opt; nd_uint16_t lsa_p_metric; nd_byte lsa_p_prefix[IPV6_ADDR_LEN_BYTES]; /* maximum length */ }; /* link state advertisement */ struct lsa6 { struct lsa6_hdr ls_hdr; /* Link state types */ union { /* Router links advertisements */ struct { union { nd_uint8_t flg; nd_uint32_t opt; } rla_flgandopt; #define rla_flags rla_flgandopt.flg #define rla_options rla_flgandopt.opt struct rlalink6 { nd_uint8_t link_type; nd_byte link_zero; nd_uint16_t link_metric; nd_uint32_t link_ifid; nd_uint32_t link_nifid; rtrid_t link_nrtid; } rla_link[1]; /* may repeat */ } un_rla; /* Network links advertisements */ struct { nd_uint32_t nla_options; rtrid_t nla_router[1]; /* may repeat */ } un_nla; /* Inter Area Prefix LSA */ struct { nd_uint32_t inter_ap_metric; struct lsa6_prefix inter_ap_prefix[1]; } un_inter_ap; /* AS external links advertisements */ struct { nd_uint32_t asla_metric; struct lsa6_prefix asla_prefix[1]; /* some optional fields follow */ } un_asla; #if 0 /* Summary links advertisements */ struct { nd_ipv4 sla_mask; nd_uint32_t sla_tosmetric[1]; /* may repeat */ } un_sla; /* Multicast group membership */ struct mcla { nd_uint32_t mcla_vtype; nd_ipv4 mcla_vid; } un_mcla[1]; #endif /* Type 7 LSA */ /* Link LSA */ struct llsa { union { nd_uint8_t pri; nd_uint32_t opt; } llsa_priandopt; #define llsa_priority llsa_priandopt.pri #define llsa_options llsa_priandopt.opt nd_ipv6 llsa_lladdr; nd_uint32_t llsa_nprefix; struct lsa6_prefix llsa_prefix[1]; } un_llsa; /* Intra-Area-Prefix */ struct { nd_uint16_t intra_ap_nprefix; nd_uint16_t intra_ap_lstype; rtrid_t intra_ap_lsid; rtrid_t intra_ap_rtid; struct lsa6_prefix intra_ap_prefix[1]; } un_intra_ap; } lsa_un; }; /* * the main header */ struct ospf6hdr { nd_uint8_t ospf6_version; nd_uint8_t ospf6_type; nd_uint16_t ospf6_len; rtrid_t ospf6_routerid; rtrid_t ospf6_areaid; nd_uint16_t ospf6_chksum; nd_uint8_t ospf6_instanceid; nd_uint8_t ospf6_rsvd; }; /* * The OSPF6 header length is 16 bytes, regardless of how your compiler * might choose to pad the above structure. */ #define OSPF6HDR_LEN 16 /* Hello packet */ struct hello6 { nd_uint32_t hello_ifid; union { nd_uint8_t pri; nd_uint32_t opt; } hello_priandopt; #define hello_priority hello_priandopt.pri #define hello_options hello_priandopt.opt nd_uint16_t hello_helloint; nd_uint16_t hello_deadint; rtrid_t hello_dr; rtrid_t hello_bdr; rtrid_t hello_neighbor[1]; /* may repeat */ }; /* Database Description packet */ struct dd6 { nd_uint32_t db_options; nd_uint16_t db_mtu; nd_uint8_t db_mbz; nd_uint8_t db_flags; nd_uint32_t db_seq; struct lsa6_hdr db_lshdr[1]; /* may repeat */ }; /* Link State Request */ struct lsr6 { nd_uint16_t ls_mbz; nd_uint16_t ls_type; rtrid_t ls_stateid; rtrid_t ls_router; }; /* Link State Update */ struct lsu6 { nd_uint32_t lsu_count; struct lsa6 lsu_lsa[1]; /* may repeat */ }; static const struct tok ospf6_option_values[] = { { OSPF6_OPTION_V6, "V6" }, { OSPF6_OPTION_E, "External" }, { OSPF6_OPTION_MC, "Deprecated" }, { OSPF6_OPTION_N, "NSSA" }, { OSPF6_OPTION_R, "Router" }, { OSPF6_OPTION_DC, "Demand Circuit" }, { OSPF6_OPTION_AF, "AFs Support" }, { OSPF6_OPTION_L, "LLS" }, { OSPF6_OPTION_AT, "Authentication Trailer" }, { 0, NULL } }; static const struct tok ospf6_rla_flag_values[] = { { RLA_FLAG_B, "ABR" }, { RLA_FLAG_E, "External" }, { RLA_FLAG_V, "Virtual-Link Endpoint" }, { RLA_FLAG_W, "Deprecated" }, { RLA_FLAG_Nt, "NSSA Translator" }, { 0, NULL } }; static const struct tok ospf6_asla_flag_values[] = { { ASLA_FLAG_EXTERNAL, "External Type 2" }, { ASLA_FLAG_FWDADDR, "Forwarding" }, { ASLA_FLAG_ROUTETAG, "Tag" }, { 0, NULL } }; static const struct tok ospf6_type_values[] = { { OSPF_TYPE_HELLO, "Hello" }, { OSPF_TYPE_DD, "Database Description" }, { OSPF_TYPE_LS_REQ, "LS-Request" }, { OSPF_TYPE_LS_UPDATE, "LS-Update" }, { OSPF_TYPE_LS_ACK, "LS-Ack" }, { 0, NULL } }; static const struct tok ospf6_lsa_values[] = { { LS_TYPE_ROUTER, "Router" }, { LS_TYPE_NETWORK, "Network" }, { LS_TYPE_INTER_AP, "Inter-Area Prefix" }, { LS_TYPE_INTER_AR, "Inter-Area Router" }, { LS_TYPE_ASE, "External" }, { LS_TYPE_GROUP, "Deprecated" }, { LS_TYPE_NSSA, "NSSA" }, { LS_TYPE_LINK, "Link" }, { LS_TYPE_INTRA_AP, "Intra-Area Prefix" }, { LS_TYPE_INTRA_ATE, "Intra-Area TE" }, { LS_TYPE_GRACE, "Grace" }, { LS_TYPE_RI, "Router Information" }, { LS_TYPE_INTER_ASTE, "Inter-AS-TE" }, { LS_TYPE_L1VPN, "Layer 1 VPN" }, { 0, NULL } }; static const struct tok ospf6_ls_scope_values[] = { { LS_SCOPE_LINKLOCAL, "Link Local" }, { LS_SCOPE_AREA, "Area Local" }, { LS_SCOPE_AS, "Domain Wide" }, { 0, NULL } }; static const struct tok ospf6_dd_flag_values[] = { { OSPF6_DB_INIT, "Init" }, { OSPF6_DB_MORE, "More" }, { OSPF6_DB_MASTER, "Master" }, { OSPF6_DB_M6, "IPv6 MTU" }, { 0, NULL } }; static const struct tok ospf6_lsa_prefix_option_values[] = { { LSA_PREFIX_OPT_NU, "No Unicast" }, { LSA_PREFIX_OPT_LA, "Local address" }, { LSA_PREFIX_OPT_MC, "Deprecated" }, { LSA_PREFIX_OPT_P, "Propagate" }, { LSA_PREFIX_OPT_DN, "Down" }, { LSA_PREFIX_OPT_N, "N-bit" }, { 0, NULL } }; static const struct tok ospf6_auth_type_str[] = { { OSPF6_AUTH_TYPE_HMAC, "HMAC" }, { 0, NULL } }; static void ospf6_print_ls_type(netdissect_options *ndo, u_int ls_type, const rtrid_t *ls_stateid) { ND_PRINT("\n\t %s LSA (%u), %s Scope%s, LSA-ID %s", tok2str(ospf6_lsa_values, "Unknown", ls_type & LS_TYPE_MASK), ls_type & LS_TYPE_MASK, tok2str(ospf6_ls_scope_values, "Unknown", ls_type & LS_SCOPE_MASK), ls_type &0x8000 ? ", transitive" : "", /* U-bit */ GET_IPADDR_STRING((const u_char *)ls_stateid)); } static int ospf6_print_lshdr(netdissect_options *ndo, const struct lsa6_hdr *lshp, const u_char *dataend) { if ((const u_char *)(lshp + 1) > dataend) goto trunc; ND_PRINT("\n\t Advertising Router %s, seq 0x%08x, age %us, length %zu", GET_IPADDR_STRING(lshp->ls_router), GET_BE_U_4(lshp->ls_seq), GET_BE_U_2(lshp->ls_age), GET_BE_U_2(lshp->ls_length)-sizeof(struct lsa6_hdr)); ospf6_print_ls_type(ndo, GET_BE_U_2(lshp->ls_type), &lshp->ls_stateid); return (0); trunc: return (1); } static int ospf6_print_lsaprefix(netdissect_options *ndo, const uint8_t *tptr, u_int lsa_length) { const struct lsa6_prefix *lsapp = (const struct lsa6_prefix *)tptr; u_int wordlen; nd_ipv6 prefix; if (lsa_length < sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES) goto trunc; lsa_length -= sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES; ND_TCHECK_LEN(lsapp, sizeof(*lsapp) - IPV6_ADDR_LEN_BYTES); wordlen = (GET_U_1(lsapp->lsa_p_len) + 31) / 32; if (wordlen * 4 > sizeof(nd_ipv6)) { ND_PRINT(" bogus prefixlen /%u", GET_U_1(lsapp->lsa_p_len)); goto trunc; } if (lsa_length < wordlen * 4) goto trunc; lsa_length -= wordlen * 4; ND_TCHECK_LEN(lsapp->lsa_p_prefix, wordlen * 4); memset(prefix, 0, sizeof(prefix)); memcpy(prefix, lsapp->lsa_p_prefix, wordlen * 4); ND_PRINT("\n\t\t%s/%u", ip6addr_string(ndo, prefix), /* local buffer, not packet data; don't use GET_IP6ADDR_STRING() */ GET_U_1(lsapp->lsa_p_len)); if (GET_U_1(lsapp->lsa_p_opt)) { ND_PRINT(", Options [%s]", bittok2str(ospf6_lsa_prefix_option_values, "none", GET_U_1(lsapp->lsa_p_opt))); } ND_PRINT(", metric %u", GET_BE_U_2(lsapp->lsa_p_metric)); return sizeof(*lsapp) - IPV6_ADDR_LEN_BYTES + wordlen * 4; trunc: return -1; } /* * Print a single link state advertisement. If truncated return 1, else 0. */ static int ospf6_print_lsa(netdissect_options *ndo, const struct lsa6 *lsap, const u_char *dataend) { const struct rlalink6 *rlp; #if 0 const struct tos_metric *tosp; #endif const rtrid_t *ap; #if 0 const struct aslametric *almp; const struct mcla *mcp; #endif const struct llsa *llsap; const struct lsa6_prefix *lsapp; #if 0 const uint32_t *lp; #endif u_int prefixes; int bytelen; u_int length, lsa_length; uint32_t flags32; const uint8_t *tptr; if (ospf6_print_lshdr(ndo, &lsap->ls_hdr, dataend)) return (1); length = GET_BE_U_2(lsap->ls_hdr.ls_length); /* * The LSA length includes the length of the header; * it must have a value that's at least that length. * If it does, find the length of what follows the * header. */ if (length < sizeof(struct lsa6_hdr) || (const u_char *)lsap + length > dataend) return (1); lsa_length = length - sizeof(struct lsa6_hdr); tptr = (const uint8_t *)lsap+sizeof(struct lsa6_hdr); switch (GET_BE_U_2(lsap->ls_hdr.ls_type)) { case LS_TYPE_ROUTER | LS_SCOPE_AREA: if (lsa_length < sizeof (lsap->lsa_un.un_rla.rla_options)) return (1); lsa_length -= sizeof (lsap->lsa_un.un_rla.rla_options); ND_PRINT("\n\t Options [%s]", bittok2str(ospf6_option_values, "none", GET_BE_U_4(lsap->lsa_un.un_rla.rla_options))); ND_PRINT(", RLA-Flags [%s]", bittok2str(ospf6_rla_flag_values, "none", GET_U_1(lsap->lsa_un.un_rla.rla_flags))); rlp = lsap->lsa_un.un_rla.rla_link; while (lsa_length != 0) { if (lsa_length < sizeof (*rlp)) return (1); lsa_length -= sizeof (*rlp); ND_TCHECK_SIZE(rlp); switch (GET_U_1(rlp->link_type)) { case RLA_TYPE_VIRTUAL: ND_PRINT("\n\t Virtual Link: Neighbor Router-ID %s" "\n\t Neighbor Interface-ID %s, Interface %s", GET_IPADDR_STRING(rlp->link_nrtid), GET_IPADDR_STRING(rlp->link_nifid), GET_IPADDR_STRING(rlp->link_ifid)); break; case RLA_TYPE_ROUTER: ND_PRINT("\n\t Neighbor Router-ID %s" "\n\t Neighbor Interface-ID %s, Interface %s", GET_IPADDR_STRING(rlp->link_nrtid), GET_IPADDR_STRING(rlp->link_nifid), GET_IPADDR_STRING(rlp->link_ifid)); break; case RLA_TYPE_TRANSIT: ND_PRINT("\n\t Neighbor Network-ID %s" "\n\t Neighbor Interface-ID %s, Interface %s", GET_IPADDR_STRING(rlp->link_nrtid), GET_IPADDR_STRING(rlp->link_nifid), GET_IPADDR_STRING(rlp->link_ifid)); break; default: ND_PRINT("\n\t Unknown Router Links Type 0x%02x", GET_U_1(rlp->link_type)); return (0); } ND_PRINT(", metric %u", GET_BE_U_2(rlp->link_metric)); rlp++; } break; case LS_TYPE_NETWORK | LS_SCOPE_AREA: if (lsa_length < sizeof (lsap->lsa_un.un_nla.nla_options)) return (1); lsa_length -= sizeof (lsap->lsa_un.un_nla.nla_options); ND_PRINT("\n\t Options [%s]", bittok2str(ospf6_option_values, "none", GET_BE_U_4(lsap->lsa_un.un_nla.nla_options))); ND_PRINT("\n\t Connected Routers:"); ap = lsap->lsa_un.un_nla.nla_router; while (lsa_length != 0) { if (lsa_length < sizeof (*ap)) return (1); lsa_length -= sizeof (*ap); ND_TCHECK_SIZE(ap); ND_PRINT("\n\t\t%s", GET_IPADDR_STRING(*ap)); ++ap; } break; case LS_TYPE_INTER_AP | LS_SCOPE_AREA: if (lsa_length < sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric)) return (1); lsa_length -= sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric); ND_PRINT(", metric %u", GET_BE_U_4(lsap->lsa_un.un_inter_ap.inter_ap_metric) & SLA_MASK_METRIC); tptr = (const uint8_t *)lsap->lsa_un.un_inter_ap.inter_ap_prefix; while (lsa_length != 0) { bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); if (bytelen < 0) goto trunc; /* * ospf6_print_lsaprefix() will return -1 if * the length is too high, so this will not * underflow. */ lsa_length -= bytelen; tptr += bytelen; } break; case LS_TYPE_ASE | LS_SCOPE_AS: if (lsa_length < sizeof (lsap->lsa_un.un_asla.asla_metric)) return (1); lsa_length -= sizeof (lsap->lsa_un.un_asla.asla_metric); flags32 = GET_BE_U_4(lsap->lsa_un.un_asla.asla_metric); ND_PRINT("\n\t Flags [%s]", bittok2str(ospf6_asla_flag_values, "none", flags32)); ND_PRINT(" metric %u", GET_BE_U_4(lsap->lsa_un.un_asla.asla_metric) & ASLA_MASK_METRIC); tptr = (const uint8_t *)lsap->lsa_un.un_asla.asla_prefix; lsapp = (const struct lsa6_prefix *)tptr; bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); if (bytelen < 0) goto trunc; /* * ospf6_print_lsaprefix() will return -1 if * the length is too high, so this will not * underflow. */ lsa_length -= bytelen; tptr += bytelen; if ((flags32 & ASLA_FLAG_FWDADDR) != 0) { if (lsa_length < sizeof (nd_ipv6)) return (1); lsa_length -= sizeof (nd_ipv6); ND_PRINT(" forward %s", GET_IP6ADDR_STRING(tptr)); tptr += sizeof(nd_ipv6); } if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) { if (lsa_length < sizeof (uint32_t)) return (1); lsa_length -= sizeof (uint32_t); ND_PRINT(" tag %s", GET_IPADDR_STRING(tptr)); tptr += sizeof(uint32_t); } if (GET_U_1(lsapp->lsa_p_metric)) { if (lsa_length < sizeof (uint32_t)) return (1); lsa_length -= sizeof (uint32_t); ND_PRINT(" RefLSID: %s", GET_IPADDR_STRING(tptr)); tptr += sizeof(uint32_t); } break; case LS_TYPE_LINK: /* Link LSA */ llsap = &lsap->lsa_un.un_llsa; if (lsa_length < sizeof (llsap->llsa_priandopt)) return (1); lsa_length -= sizeof (llsap->llsa_priandopt); ND_TCHECK_SIZE(&llsap->llsa_priandopt); ND_PRINT("\n\t Options [%s]", bittok2str(ospf6_option_values, "none", GET_BE_U_4(llsap->llsa_options))); if (lsa_length < sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix)) return (1); lsa_length -= sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix); prefixes = GET_BE_U_4(llsap->llsa_nprefix); ND_PRINT("\n\t Priority %u, Link-local address %s, Prefixes %u:", GET_U_1(llsap->llsa_priority), GET_IP6ADDR_STRING(llsap->llsa_lladdr), prefixes); tptr = (const uint8_t *)llsap->llsa_prefix; while (prefixes > 0) { bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); if (bytelen < 0) goto trunc; prefixes--; /* * ospf6_print_lsaprefix() will return -1 if * the length is too high, so this will not * underflow. */ lsa_length -= bytelen; tptr += bytelen; } break; case LS_TYPE_INTRA_AP | LS_SCOPE_AREA: /* Intra-Area-Prefix LSA */ if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid)) return (1); lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid); ND_TCHECK_4(lsap->lsa_un.un_intra_ap.intra_ap_rtid); ospf6_print_ls_type(ndo, GET_BE_U_2(lsap->lsa_un.un_intra_ap.intra_ap_lstype), &lsap->lsa_un.un_intra_ap.intra_ap_lsid); if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix)) return (1); lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix); prefixes = GET_BE_U_2(lsap->lsa_un.un_intra_ap.intra_ap_nprefix); ND_PRINT("\n\t Prefixes %u:", prefixes); tptr = (const uint8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix; while (prefixes > 0) { bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); if (bytelen < 0) goto trunc; prefixes--; /* * ospf6_print_lsaprefix() will return -1 if * the length is too high, so this will not * underflow. */ lsa_length -= bytelen; tptr += bytelen; } break; case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL: if (ospf_grace_lsa_print(ndo, tptr, lsa_length) == -1) { return 1; } break; case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL: if (ospf_te_lsa_print(ndo, tptr, lsa_length) == -1) { return 1; } break; default: if(!print_unknown_data(ndo,tptr, "\n\t ", lsa_length)) { return (1); } break; } return (0); trunc: return (1); } static int ospf6_decode_v3(netdissect_options *ndo, const struct ospf6hdr *op, const u_char *dataend) { const rtrid_t *ap; const struct lsr6 *lsrp; const struct lsa6_hdr *lshp; const struct lsa6 *lsap; int i; switch (GET_U_1(op->ospf6_type)) { case OSPF_TYPE_HELLO: { const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN); ND_PRINT("\n\tOptions [%s]", bittok2str(ospf6_option_values, "none", GET_BE_U_4(hellop->hello_options))); ND_PRINT("\n\t Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u", GET_BE_U_2(hellop->hello_helloint), GET_BE_U_2(hellop->hello_deadint), GET_IPADDR_STRING(hellop->hello_ifid), GET_U_1(hellop->hello_priority)); if (GET_BE_U_4(hellop->hello_dr) != 0) ND_PRINT("\n\t Designated Router %s", GET_IPADDR_STRING(hellop->hello_dr)); if (GET_BE_U_4(hellop->hello_bdr) != 0) ND_PRINT(", Backup Designated Router %s", GET_IPADDR_STRING(hellop->hello_bdr)); if (ndo->ndo_vflag > 1) { ND_PRINT("\n\t Neighbor List:"); ap = hellop->hello_neighbor; while ((const u_char *)ap < dataend) { ND_TCHECK_SIZE(ap); ND_PRINT("\n\t %s", GET_IPADDR_STRING(*ap)); ++ap; } } break; /* HELLO */ } case OSPF_TYPE_DD: { const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN); ND_PRINT("\n\tOptions [%s]", bittok2str(ospf6_option_values, "none", GET_BE_U_4(ddp->db_options))); ND_PRINT(", DD Flags [%s]", bittok2str(ospf6_dd_flag_values,"none",GET_U_1(ddp->db_flags))); ND_PRINT(", MTU %u, DD-Sequence 0x%08x", GET_BE_U_2(ddp->db_mtu), GET_BE_U_4(ddp->db_seq)); if (ndo->ndo_vflag > 1) { /* Print all the LS adv's */ lshp = ddp->db_lshdr; while ((const u_char *)lshp < dataend) { if (ospf6_print_lshdr(ndo, lshp++, dataend)) goto trunc; } } break; } case OSPF_TYPE_LS_REQ: if (ndo->ndo_vflag > 1) { lsrp = (const struct lsr6 *)((const uint8_t *)op + OSPF6HDR_LEN); while ((const u_char *)lsrp < dataend) { ND_TCHECK_SIZE(lsrp); ND_PRINT("\n\t Advertising Router %s", GET_IPADDR_STRING(lsrp->ls_router)); ospf6_print_ls_type(ndo, GET_BE_U_2(lsrp->ls_type), &lsrp->ls_stateid); ++lsrp; } } break; case OSPF_TYPE_LS_UPDATE: if (ndo->ndo_vflag > 1) { const struct lsu6 *lsup = (const struct lsu6 *)((const uint8_t *)op + OSPF6HDR_LEN); i = GET_BE_U_4(lsup->lsu_count); lsap = lsup->lsu_lsa; while ((const u_char *)lsap < dataend && i--) { if (ospf6_print_lsa(ndo, lsap, dataend)) goto trunc; lsap = (const struct lsa6 *)((const u_char *)lsap + GET_BE_U_2(lsap->ls_hdr.ls_length)); } } break; case OSPF_TYPE_LS_ACK: if (ndo->ndo_vflag > 1) { lshp = (const struct lsa6_hdr *)((const uint8_t *)op + OSPF6HDR_LEN); while ((const u_char *)lshp < dataend) { if (ospf6_print_lshdr(ndo, lshp++, dataend)) goto trunc; } } break; default: break; } return (0); trunc: return (1); } /* RFC5613 Section 2.2 (w/o the TLVs) */ static int ospf6_print_lls(netdissect_options *ndo, const u_char *cp, const u_int len) { uint16_t llsdatalen; if (len == 0) return 0; if (len < OSPF_LLS_HDRLEN) goto trunc; /* Checksum */ ND_PRINT("\n\tLLS Checksum 0x%04x", GET_BE_U_2(cp)); cp += 2; /* LLS Data Length */ llsdatalen = GET_BE_U_2(cp); ND_PRINT(", Data Length %u", llsdatalen); if (llsdatalen < OSPF_LLS_HDRLEN || llsdatalen > len) goto trunc; cp += 2; /* LLS TLVs */ ND_TCHECK_LEN(cp, llsdatalen - OSPF_LLS_HDRLEN); /* FIXME: code in print-ospf.c can be reused to decode the TLVs */ return llsdatalen; trunc: return -1; } /* RFC6506 Section 4.1 */ static int ospf6_decode_at(netdissect_options *ndo, const u_char *cp, const u_int len) { uint16_t authdatalen; if (len == 0) return 0; if (len < OSPF6_AT_HDRLEN) goto trunc; /* Authentication Type */ ND_PRINT("\n\tAuthentication Type %s", tok2str(ospf6_auth_type_str, "unknown (0x%04x)", GET_BE_U_2(cp))); cp += 2; /* Auth Data Len */ authdatalen = GET_BE_U_2(cp); ND_PRINT(", Length %u", authdatalen); if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len) goto trunc; cp += 2; /* Reserved */ cp += 2; /* Security Association ID */ ND_PRINT(", SAID %u", GET_BE_U_2(cp)); cp += 2; /* Cryptographic Sequence Number (High-Order 32 Bits) */ ND_PRINT(", CSN 0x%08x", GET_BE_U_4(cp)); cp += 4; /* Cryptographic Sequence Number (Low-Order 32 Bits) */ ND_PRINT(":%08x", GET_BE_U_4(cp)); cp += 4; /* Authentication Data */ ND_TCHECK_LEN(cp, authdatalen - OSPF6_AT_HDRLEN); if (ndo->ndo_vflag > 1) print_unknown_data(ndo,cp, "\n\tAuthentication Data ", authdatalen - OSPF6_AT_HDRLEN); return 0; trunc: return 1; } /* The trailing data may include LLS and/or AT data (in this specific order). * LLS data may be present only in Hello and DBDesc packets with the L-bit set. * AT data may be present in Hello and DBDesc packets with the AT-bit set or in * any other packet type, thus decode the AT data regardless of the AT-bit. */ static int ospf6_decode_v3_trailer(netdissect_options *ndo, const struct ospf6hdr *op, const u_char *cp, const unsigned len) { uint8_t type; int llslen = 0; int lls_hello = 0; int lls_dd = 0; type = GET_U_1(op->ospf6_type); if (type == OSPF_TYPE_HELLO) { const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN); if (GET_BE_U_4(hellop->hello_options) & OSPF6_OPTION_L) lls_hello = 1; } else if (type == OSPF_TYPE_DD) { const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN); if (GET_BE_U_4(ddp->db_options) & OSPF6_OPTION_L) lls_dd = 1; } if ((lls_hello || lls_dd) && (llslen = ospf6_print_lls(ndo, cp, len)) < 0) goto trunc; return ospf6_decode_at(ndo, cp + llslen, len - llslen); trunc: return 1; } void ospf6_print(netdissect_options *ndo, const u_char *bp, u_int length) { const struct ospf6hdr *op; const u_char *dataend; const char *cp; uint16_t datalen; ndo->ndo_protocol = "ospf3"; op = (const struct ospf6hdr *)bp; /* If the type is valid translate it, or just print the type */ /* value. If it's not valid, say so and return */ cp = tok2str(ospf6_type_values, "unknown packet type (%u)", GET_U_1(op->ospf6_type)); ND_PRINT("OSPFv%u, %s, length %u", GET_U_1(op->ospf6_version), cp, length); if (*cp == 'u') { return; } if(!ndo->ndo_vflag) { /* non verbose - so lets bail out here */ return; } /* OSPFv3 data always comes first and optional trailing data may follow. */ datalen = GET_BE_U_2(op->ospf6_len); if (datalen > length) { ND_PRINT(" [len %u]", datalen); return; } dataend = bp + datalen; ND_PRINT("\n\tRouter-ID %s", GET_IPADDR_STRING(op->ospf6_routerid)); if (GET_BE_U_4(op->ospf6_areaid) != 0) ND_PRINT(", Area %s", GET_IPADDR_STRING(op->ospf6_areaid)); else ND_PRINT(", Backbone Area"); if (GET_U_1(op->ospf6_instanceid)) ND_PRINT(", Instance %u", GET_U_1(op->ospf6_instanceid)); /* Do rest according to version. */ switch (GET_U_1(op->ospf6_version)) { case 3: /* ospf version 3 */ if (ospf6_decode_v3(ndo, op, dataend) || ospf6_decode_v3_trailer(ndo, op, dataend, length - datalen)) goto trunc; break; } /* end switch on version */ return; trunc: nd_print_trunc(ndo); }