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-rw-r--r--print-ospf6.c1002
1 files changed, 1002 insertions, 0 deletions
diff --git a/print-ospf6.c b/print-ospf6.c
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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);
+}