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Diffstat (limited to '')
| -rw-r--r-- | print-ospf6.c | 1002 |
1 files changed, 1002 insertions, 0 deletions
diff --git a/print-ospf6.c b/print-ospf6.c new file mode 100644 index 0000000..4916795 --- /dev/null +++ b/print-ospf6.c @@ -0,0 +1,1002 @@ +/* + * 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 <config.h> +#endif + +#include "netdissect-stdinc.h" + +#include <string.h> + +#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(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; + memset(prefix, 0, sizeof(prefix)); + GET_CPY_BYTES(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_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_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); +} |