text: /*
   * 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_N      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
  
  /* 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 uint32_t rtrid_t;
  
  /* link state advertisement header */
  struct lsa6_hdr {
      uint16_t ls_age;
      uint16_t ls_type;
      rtrid_t ls_stateid;
      rtrid_t ls_router;
      uint32_t ls_seq;
      uint16_t ls_chksum;
      uint16_t ls_length;
  };
  
  /* Length of an IPv6 address, in bytes. */
  #define IPV6_ADDR_LEN_BYTES (128/8)
  
  struct lsa6_prefix {
      uint8_t lsa_p_len;
      uint8_t lsa_p_opt;
      uint16_t lsa_p_metric;
      uint8_t 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 {
  		uint8_t flg;
  		uint32_t opt;
  	    } rla_flgandopt;
  #define rla_flags	rla_flgandopt.flg
  #define rla_options	rla_flgandopt.opt
  	    struct rlalink6 {
  		uint8_t link_type;
  		uint8_t link_zero[1];
  		uint16_t link_metric;
  		uint32_t link_ifid;
  		uint32_t link_nifid;
  		rtrid_t link_nrtid;
  	    } rla_link[1];		/* may repeat	*/
  	} un_rla;
  
  	/* Network links advertisements */
  	struct {
  	    uint32_t nla_options;
  	    rtrid_t nla_router[1];	/* may repeat	*/
  	} un_nla;
  
  	/* Inter Area Prefix LSA */
  	struct {
  	    uint32_t inter_ap_metric;
  	    struct lsa6_prefix inter_ap_prefix[1];
  	} un_inter_ap;
  
  	/* AS external links advertisements */
  	struct {
  	    uint32_t asla_metric;
  	    struct lsa6_prefix asla_prefix[1];
  	    /* some optional fields follow */
  	} un_asla;
  
  #if 0
  	/* Summary links advertisements */
  	struct {
  	    struct in_addr sla_mask;
  	    uint32_t sla_tosmetric[1];	/* may repeat	*/
  	} un_sla;
  
  	/* Multicast group membership */
  	struct mcla {
  	    uint32_t mcla_vtype;
  	    struct in_addr mcla_vid;
  	} un_mcla[1];
  #endif
  
  	/* Type 7 LSA */
  
  	/* Link LSA */
  	struct llsa {
  	    union {
  		uint8_t pri;
  		uint32_t opt;
  	    } llsa_priandopt;
  #define llsa_priority	llsa_priandopt.pri
  #define llsa_options	llsa_priandopt.opt
  	    struct in6_addr llsa_lladdr;
  	    uint32_t llsa_nprefix;
  	    struct lsa6_prefix llsa_prefix[1];
  	} un_llsa;
  
  	/* Intra-Area-Prefix */
  	struct {
  	    uint16_t intra_ap_nprefix;
  	    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 {
      uint8_t ospf6_version;
      uint8_t ospf6_type;
      uint16_t ospf6_len;
      rtrid_t ospf6_routerid;
      rtrid_t ospf6_areaid;
      uint16_t ospf6_chksum;
      uint8_t ospf6_instanceid;
      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 {
      uint32_t hello_ifid;
      union {
  	uint8_t pri;
  	uint32_t opt;
      } hello_priandopt;
  #define hello_priority	hello_priandopt.pri
  #define hello_options	hello_priandopt.opt
      uint16_t hello_helloint;
      uint16_t hello_deadint;
      rtrid_t hello_dr;
      rtrid_t hello_bdr;
      rtrid_t hello_neighbor[1]; /* may repeat	*/
  };
  
  /* Database Description packet */
  struct dd6 {
      uint32_t db_options;
      uint16_t db_mtu;
      uint8_t db_mbz;
      uint8_t db_flags;
      uint32_t db_seq;
      struct lsa6_hdr db_lshdr[1]; /* may repeat	*/
  };
  
  /* Link State Request */
  struct lsr6 {
      uint16_t ls_mbz;
      uint16_t ls_type;
      rtrid_t ls_stateid;
      rtrid_t ls_router;
  };
  
  /* Link State Update */
  struct lsu6 {
      uint32_t lsu_count;
      struct lsa6 lsu_lsa[1]; /* may repeat	*/
  };
  
  static const char tstr[] = " [|ospf3]";
  
  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,		"Wildcard Receiver" },
          { RLA_FLAG_N,           "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" },
  	{ 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,
                      register u_int ls_type, register const rtrid_t *ls_stateid)
  {
          ND_PRINT((ndo, "\n\t    %s LSA (%d), %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 */
                 ipaddr_string(ndo, ls_stateid)));
  }
  
  static int
  ospf6_print_lshdr(netdissect_options *ndo,
                    register const struct lsa6_hdr *lshp, const u_char *dataend)
  {
  	if ((const u_char *)(lshp + 1) > dataend)
  		goto trunc;
  	ND_TCHECK(lshp->ls_length);	/* last field of struct lsa6_hdr */
  
  	ND_PRINT((ndo, "\n\t  Advertising Router %s, seq 0x%08x, age %us, length %u",
                 ipaddr_string(ndo, &lshp->ls_router),
                 EXTRACT_32BITS(&lshp->ls_seq),
                 EXTRACT_16BITS(&lshp->ls_age),
                 EXTRACT_16BITS(&lshp->ls_length)-(u_int)sizeof(struct lsa6_hdr)));
  
  	ospf6_print_ls_type(ndo, EXTRACT_16BITS(&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;
  	struct in6_addr prefix;
  
  	if (lsa_length < sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES)
  		goto trunc;
  	lsa_length -= sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES;
  	ND_TCHECK2(*lsapp, sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES);
  	wordlen = (lsapp->lsa_p_len + 31) / 32;
  	if (wordlen * 4 > sizeof(struct in6_addr)) {
  		ND_PRINT((ndo, " bogus prefixlen /%d", lsapp->lsa_p_len));
  		goto trunc;
  	}
  	if (lsa_length < wordlen * 4)
  		goto trunc;
  	lsa_length -= wordlen * 4;
  	ND_TCHECK2(lsapp->lsa_p_prefix, wordlen * 4);
  	memset(&prefix, 0, sizeof(prefix));
  	memcpy(&prefix, lsapp->lsa_p_prefix, wordlen * 4);
  	ND_PRINT((ndo, "\n\t\t%s/%d", ip6addr_string(ndo, &prefix),
  		lsapp->lsa_p_len));
          if (lsapp->lsa_p_opt) {
              ND_PRINT((ndo, ", Options [%s]",
                     bittok2str(ospf6_lsa_prefix_option_values,
                                "none", lsapp->lsa_p_opt)));
          }
          ND_PRINT((ndo, ", metric %u", EXTRACT_16BITS(&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,
                  register const struct lsa6 *lsap, const u_char *dataend)
  {
  	register const struct rlalink6 *rlp;
  #if 0
  	register const struct tos_metric *tosp;
  #endif
  	register const rtrid_t *ap;
  #if 0
  	register const struct aslametric *almp;
  	register const struct mcla *mcp;
  #endif
  	register const struct llsa *llsap;
  	register const struct lsa6_prefix *lsapp;
  #if 0
  	register const uint32_t *lp;
  #endif
  	register u_int prefixes;
  	register int bytelen;
  	register u_int length, lsa_length;
  	uint32_t flags32;
  	const uint8_t *tptr;
  
  	if (ospf6_print_lshdr(ndo, &lsap->ls_hdr, dataend))
  		return (1);
  	ND_TCHECK(lsap->ls_hdr.ls_length);
          length = EXTRACT_16BITS(&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 (EXTRACT_16BITS(&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_TCHECK(lsap->lsa_un.un_rla.rla_options);
  		ND_PRINT((ndo, "\n\t      Options [%s]",
  		          bittok2str(ospf6_option_values, "none",
  		          EXTRACT_32BITS(&lsap->lsa_un.un_rla.rla_options))));
  		ND_PRINT((ndo, ", RLA-Flags [%s]",
  		          bittok2str(ospf6_rla_flag_values, "none",
  		          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(*rlp);
  			switch (rlp->link_type) {
  
  			case RLA_TYPE_VIRTUAL:
  				ND_PRINT((ndo, "\n\t      Virtual Link: Neighbor Router-ID %s"
                                         "\n\t      Neighbor Interface-ID %s, Interface %s",
                                         ipaddr_string(ndo, &rlp->link_nrtid),
                                         ipaddr_string(ndo, &rlp->link_nifid),
                                         ipaddr_string(ndo, &rlp->link_ifid)));
                                  break;
  
  			case RLA_TYPE_ROUTER:
  				ND_PRINT((ndo, "\n\t      Neighbor Router-ID %s"
                                         "\n\t      Neighbor Interface-ID %s, Interface %s",
                                         ipaddr_string(ndo, &rlp->link_nrtid),
                                         ipaddr_string(ndo, &rlp->link_nifid),
                                         ipaddr_string(ndo, &rlp->link_ifid)));
  				break;
  
  			case RLA_TYPE_TRANSIT:
  				ND_PRINT((ndo, "\n\t      Neighbor Network-ID %s"
                                         "\n\t      Neighbor Interface-ID %s, Interface %s",
  				    ipaddr_string(ndo, &rlp->link_nrtid),
  				    ipaddr_string(ndo, &rlp->link_nifid),
  				    ipaddr_string(ndo, &rlp->link_ifid)));
  				break;
  
  			default:
  				ND_PRINT((ndo, "\n\t      Unknown Router Links Type 0x%02x",
  				    rlp->link_type));
  				return (0);
  			}
  			ND_PRINT((ndo, ", metric %d", EXTRACT_16BITS(&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_TCHECK(lsap->lsa_un.un_nla.nla_options);
  		ND_PRINT((ndo, "\n\t      Options [%s]",
  		          bittok2str(ospf6_option_values, "none",
  		          EXTRACT_32BITS(&lsap->lsa_un.un_nla.nla_options))));
  
  		ND_PRINT((ndo, "\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(*ap);
  			ND_PRINT((ndo, "\n\t\t%s", ipaddr_string(ndo, 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_TCHECK(lsap->lsa_un.un_inter_ap.inter_ap_metric);
  		ND_PRINT((ndo, ", metric %u",
  			EXTRACT_32BITS(&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;
  			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);
  		ND_TCHECK(lsap->lsa_un.un_asla.asla_metric);
  		flags32 = EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric);
  		ND_PRINT((ndo, "\n\t     Flags [%s]",
  		          bittok2str(ospf6_asla_flag_values, "none", flags32)));
  		ND_PRINT((ndo, " metric %u",
  		       EXTRACT_32BITS(&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;
  		lsa_length -= bytelen;
  		tptr += bytelen;
  
  		if ((flags32 & ASLA_FLAG_FWDADDR) != 0) {
  			const struct in6_addr *fwdaddr6;
  
  			fwdaddr6 = (const struct in6_addr *)tptr;
  			if (lsa_length < sizeof (*fwdaddr6))
  				return (1);
  			lsa_length -= sizeof (*fwdaddr6);
  			ND_TCHECK(*fwdaddr6);
  			ND_PRINT((ndo, " forward %s",
  			       ip6addr_string(ndo, fwdaddr6)));
  			tptr += sizeof(*fwdaddr6);
  		}
  
  		if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) {
  			if (lsa_length < sizeof (uint32_t))
  				return (1);
  			lsa_length -= sizeof (uint32_t);
  			ND_TCHECK(*(const uint32_t *)tptr);
  			ND_PRINT((ndo, " tag %s",
  			       ipaddr_string(ndo, (const uint32_t *)tptr)));
  			tptr += sizeof(uint32_t);
  		}
  
  		if (lsapp->lsa_p_metric) {
  			if (lsa_length < sizeof (uint32_t))
  				return (1);
  			lsa_length -= sizeof (uint32_t);
  			ND_TCHECK(*(const uint32_t *)tptr);
  			ND_PRINT((ndo, " RefLSID: %s",
  			       ipaddr_string(ndo, (const uint32_t *)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(llsap->llsa_priandopt);
  		ND_PRINT((ndo, "\n\t      Options [%s]",
  		          bittok2str(ospf6_option_values, "none",
  		          EXTRACT_32BITS(&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);
                  ND_TCHECK(llsap->llsa_nprefix);
                  prefixes = EXTRACT_32BITS(&llsap->llsa_nprefix);
  		ND_PRINT((ndo, "\n\t      Priority %d, Link-local address %s, Prefixes %d:",
                         llsap->llsa_priority,
                         ip6addr_string(ndo, &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--;
  			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(lsap->lsa_un.un_intra_ap.intra_ap_rtid);
  		ospf6_print_ls_type(ndo,
  			EXTRACT_16BITS(&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);
  		ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
                  prefixes = EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
  		ND_PRINT((ndo, "\n\t      Prefixes %d:", 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--;
  			lsa_length -= bytelen;
  			tptr += bytelen;
  		}
  		break;
  
          case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL:
                  if (ospf_print_grace_lsa(ndo, tptr, lsa_length) == -1) {
                      return 1;
                  }
                  break;
  
          case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL:
                  if (ospf_print_te_lsa(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,
                  register const struct ospf6hdr *op,
                  register const u_char *dataend)
  {
  	register const rtrid_t *ap;
  	register const struct lsr6 *lsrp;
  	register const struct lsa6_hdr *lshp;
  	register const struct lsa6 *lsap;
  	register int i;
  
  	switch (op->ospf6_type) {
  
  	case OSPF_TYPE_HELLO: {
  		register const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
  
  		ND_TCHECK_32BITS(&hellop->hello_options);
  		ND_PRINT((ndo, "\n\tOptions [%s]",
  		          bittok2str(ospf6_option_values, "none",
  		          EXTRACT_32BITS(&hellop->hello_options))));
  
  		ND_TCHECK(hellop->hello_deadint);
  		ND_PRINT((ndo, "\n\t  Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u",
  		          EXTRACT_16BITS(&hellop->hello_helloint),
  		          EXTRACT_16BITS(&hellop->hello_deadint),
  		          ipaddr_string(ndo, &hellop->hello_ifid),
  		          hellop->hello_priority));
  
  		ND_TCHECK(hellop->hello_dr);
  		if (EXTRACT_32BITS(&hellop->hello_dr) != 0)
  			ND_PRINT((ndo, "\n\t  Designated Router %s",
  			    ipaddr_string(ndo, &hellop->hello_dr)));
  		ND_TCHECK(hellop->hello_bdr);
  		if (EXTRACT_32BITS(&hellop->hello_bdr) != 0)
  			ND_PRINT((ndo, ", Backup Designated Router %s",
  			    ipaddr_string(ndo, &hellop->hello_bdr)));
  		if (ndo->ndo_vflag > 1) {
  			ND_PRINT((ndo, "\n\t  Neighbor List:"));
  			ap = hellop->hello_neighbor;
  			while ((const u_char *)ap < dataend) {
  				ND_TCHECK(*ap);
  				ND_PRINT((ndo, "\n\t    %s", ipaddr_string(ndo, ap)));
  				++ap;
  			}
  		}
  		break;	/* HELLO */
  	}
  
  	case OSPF_TYPE_DD: {
  		register const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
  
  		ND_TCHECK(ddp->db_options);
  		ND_PRINT((ndo, "\n\tOptions [%s]",
  		          bittok2str(ospf6_option_values, "none",
  		          EXTRACT_32BITS(&ddp->db_options))));
  		ND_TCHECK(ddp->db_flags);
  		ND_PRINT((ndo, ", DD Flags [%s]",
  		          bittok2str(ospf6_dd_flag_values,"none",ddp->db_flags)));
  
  		ND_TCHECK(ddp->db_seq);
  		ND_PRINT((ndo, ", MTU %u, DD-Sequence 0x%08x",
                         EXTRACT_16BITS(&ddp->db_mtu),
                         EXTRACT_32BITS(&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(*lsrp);
  				ND_PRINT((ndo, "\n\t  Advertising Router %s",
  				          ipaddr_string(ndo, &lsrp->ls_router)));
  				ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lsrp->ls_type),
                                                      &lsrp->ls_stateid);
  				++lsrp;
  			}
  		}
  		break;
  
  	case OSPF_TYPE_LS_UPDATE:
  		if (ndo->ndo_vflag > 1) {
  			register const struct lsu6 *lsup = (const struct lsu6 *)((const uint8_t *)op + OSPF6HDR_LEN);
  
  			ND_TCHECK(lsup->lsu_count);
  			i = EXTRACT_32BITS(&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 +
  				    EXTRACT_16BITS(&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_TCHECK2(*cp, 2);
  	ND_PRINT((ndo, "\n\tLLS Checksum 0x%04x", EXTRACT_16BITS(cp)));
  	cp += 2;
  	/* LLS Data Length */
  	ND_TCHECK2(*cp, 2);
  	llsdatalen = EXTRACT_16BITS(cp);
  	ND_PRINT((ndo, ", Data Length %u", llsdatalen));
  	if (llsdatalen < OSPF_LLS_HDRLEN || llsdatalen > len)
  		goto trunc;
  	cp += 2;
  	/* LLS TLVs */
  	ND_TCHECK2(*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_TCHECK2(*cp, 2);
  	ND_PRINT((ndo, "\n\tAuthentication Type %s", tok2str(ospf6_auth_type_str, "unknown (0x%04x)", EXTRACT_16BITS(cp))));
  	cp += 2;
  	/* Auth Data Len */
  	ND_TCHECK2(*cp, 2);
  	authdatalen = EXTRACT_16BITS(cp);
  	ND_PRINT((ndo, ", Length %u", authdatalen));
  	if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len)
  		goto trunc;
  	cp += 2;
  	/* Reserved */
  	ND_TCHECK2(*cp, 2);
  	cp += 2;
  	/* Security Association ID */
  	ND_TCHECK2(*cp, 2);
  	ND_PRINT((ndo, ", SAID %u", EXTRACT_16BITS(cp)));
  	cp += 2;
  	/* Cryptographic Sequence Number (High-Order 32 Bits) */
  	ND_TCHECK2(*cp, 4);
  	ND_PRINT((ndo, ", CSN 0x%08x", EXTRACT_32BITS(cp)));
  	cp += 4;
  	/* Cryptographic Sequence Number (Low-Order 32 Bits) */
  	ND_TCHECK2(*cp, 4);
  	ND_PRINT((ndo, ":%08x", EXTRACT_32BITS(cp)));
  	cp += 4;
  	/* Authentication Data */
  	ND_TCHECK2(*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)
  {
  	int llslen = 0;
  	int lls_hello = 0;
  	int lls_dd = 0;
  
  	if (op->ospf6_type == OSPF_TYPE_HELLO) {
  		const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
  		ND_TCHECK(hellop->hello_options);
  		if (EXTRACT_32BITS(&hellop->hello_options) & OSPF6_OPTION_L)
  			lls_hello = 1;
  	} else if (op->ospf6_type == OSPF_TYPE_DD) {
  		const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
  		ND_TCHECK(ddp->db_options);
  		if (EXTRACT_32BITS(&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,
              register const u_char *bp, register u_int length)
  {
  	register const struct ospf6hdr *op;
  	register const u_char *dataend;
  	register const char *cp;
  	uint16_t datalen;
  
  	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 */
  	ND_TCHECK(op->ospf6_type);
  	cp = tok2str(ospf6_type_values, "unknown packet type (%u)", op->ospf6_type);
  	ND_PRINT((ndo, "OSPFv%u, %s, length %d", 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. */
  	ND_TCHECK(op->ospf6_len);
  	datalen = EXTRACT_16BITS(&op->ospf6_len);
  	if (datalen > length) {
  		ND_PRINT((ndo, " [len %d]", datalen));
  		return;
  	}
  	dataend = bp + datalen;
  
  	ND_TCHECK(op->ospf6_routerid);
  	ND_PRINT((ndo, "\n\tRouter-ID %s", ipaddr_string(ndo, &op->ospf6_routerid)));
  
  	ND_TCHECK(op->ospf6_areaid);
  	if (EXTRACT_32BITS(&op->ospf6_areaid) != 0)
  		ND_PRINT((ndo, ", Area %s", ipaddr_string(ndo, &op->ospf6_areaid)));
  	else
  		ND_PRINT((ndo, ", Backbone Area"));
  	ND_TCHECK(op->ospf6_instanceid);
  	if (op->ospf6_instanceid)
  		ND_PRINT((ndo, ", Instance %u", op->ospf6_instanceid));
  
  	/* Do rest according to version.	 */
  	switch (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((ndo, "%s", tstr));
  }
  