print-ospf6.c

来自「TCPDUMP的C语言源代码,是在数据链路层的应用」· C语言 代码 · 共 590 行 · 第 1/2 页

/*
 * 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 ([e-mail])
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-ospf6.c,v 1.15 2006-09-13 06:31:11 guy Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#include <stdio.h>
#include <string.h>

#include "interface.h"
#include "addrtoname.h"
#include "extract.h"

#include "ospf.h"
#include "ospf6.h"

static const struct tok ospf6_option_values[] = {
	{ OSPF6_OPTION_V6,	"V6" },
	{ OSPF6_OPTION_E,	"External" },
	{ OSPF6_OPTION_MC,	"Multicast" },
	{ OSPF6_OPTION_N,	"NSSA" },
	{ OSPF6_OPTION_R,	"Router" },
	{ OSPF6_OPTION_DC,	"Demand Circuit" },
	{ 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,	"Fforwarding" },
	{ ASLA_FLAG_ROUTETAG,	"Tag" },
	{ 0,			NULL }
};

static 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 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,        "Multicast Group" },
	{ 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" },
	{ 0,			NULL }
};

static struct tok ospf6_ls_scope_values[] = {
	{ LS_SCOPE_LINKLOCAL,   "Link Local" },
	{ LS_SCOPE_AREA,        "Area Local" },
	{ LS_SCOPE_AS,          "Domain Wide" },
	{ 0,			NULL }
};

static struct tok ospf6_dd_flag_values[] = {
	{ OSPF6_DB_INIT,	"Init" },
	{ OSPF6_DB_MORE,	"More" },
	{ OSPF6_DB_MASTER,	"Master" },
	{ 0,			NULL }
};

static struct tok ospf6_lsa_prefix_option_values[] = {
        { LSA_PREFIX_OPT_NU, "No Unicast" },
        { LSA_PREFIX_OPT_LA, "Local address" },
        { LSA_PREFIX_OPT_MC, "Multicast" },
        { LSA_PREFIX_OPT_P, "Propagate" },
        { LSA_PREFIX_OPT_DN, "Down" },
	{ 0, NULL }
};

static char tstr[] = " [|ospf3]";

#ifdef WIN32
#define inline __inline
#endif /* WIN32 */

/* Forwards */
static void ospf6_print_ls_type(u_int, const rtrid_t *);
static int ospf6_print_lshdr(const struct lsa6_hdr *);
static int ospf6_print_lsa(const struct lsa6 *);
static int ospf6_decode_v3(const struct ospf6hdr *, const u_char *);


static void
ospf6_print_ls_type(register u_int ls_type, register const rtrid_t *ls_stateid)
{
        printf("\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(ls_stateid));
}

static int
ospf6_print_lshdr(register const struct lsa6_hdr *lshp)
{

	TCHECK(lshp->ls_type);
	TCHECK(lshp->ls_seq);

	printf("\n\t  Advertising Router %s, seq 0x%08x, age %us, length %u",
               ipaddr_string(&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(EXTRACT_16BITS(&lshp->ls_type), &lshp->ls_stateid);

	return (0);
trunc:
	return (1);
}

static int
ospf6_print_lsaprefix(register const struct lsa6_prefix *lsapp)
{
	u_int wordlen;
	struct in6_addr prefix;

	TCHECK(*lsapp);
	wordlen = (lsapp->lsa_p_len + 31) / 32;
	if (wordlen * 4 > sizeof(struct in6_addr)) {
		printf(" bogus prefixlen /%d", lsapp->lsa_p_len);
		goto trunc;
	}
	memset(&prefix, 0, sizeof(prefix));
	memcpy(&prefix, lsapp->lsa_p_prefix, wordlen * 4);
	printf("\n\t\t%s/%d", ip6addr_string(&prefix),
		lsapp->lsa_p_len);
        if (lsapp->lsa_p_opt) {
            printf(", Options [%s]",
                   bittok2str(ospf6_lsa_prefix_option_values,
                              "none", lsapp->lsa_p_opt));
        }
        printf(", metric %u", EXTRACT_16BITS(&lsapp->lsa_p_metric));
	return sizeof(*lsapp) - 4 + wordlen * 4;

trunc:
	return -1;
}


/*
 * Print a single link state advertisement.  If truncated return 1, else 0.
 */
static int
ospf6_print_lsa(register const struct lsa6 *lsap)
{
	register const u_char *ls_end, *ls_opt;
	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 u_int32_t *lp;
#endif
	register u_int prefixes;
	register int bytelen, length, lsa_length;
	u_int32_t flags32;
        u_int8_t *tptr;

	if (ospf6_print_lshdr(&lsap->ls_hdr))
		return (1);
	TCHECK(lsap->ls_hdr.ls_length);
        length = EXTRACT_16BITS(&lsap->ls_hdr.ls_length);
        lsa_length = length - sizeof(struct lsa6_hdr);
	ls_end = (u_char *)lsap + length;
        tptr = (u_int8_t *)lsap+sizeof(struct lsa6_hdr);

	switch (EXTRACT_16BITS(&lsap->ls_hdr.ls_type)) {
	case LS_TYPE_ROUTER | LS_SCOPE_AREA:
		TCHECK(lsap->lsa_un.un_rla.rla_options);
                printf("\n\t      Options [%s]",
                       bittok2str(ospf6_option_values, "none",
                                  EXTRACT_32BITS(&lsap->lsa_un.un_rla.rla_options)));

		TCHECK(lsap->lsa_un.un_rla.rla_flags);
                printf(", RLA-Flags [%s]",
                       bittok2str(ospf6_rla_flag_values, "none",
                                  lsap->lsa_un.un_rla.rla_flags));


		TCHECK(lsap->lsa_un.un_rla.rla_link);
		rlp = lsap->lsa_un.un_rla.rla_link;
		while (rlp + 1 <= (struct rlalink6 *)ls_end) {
			TCHECK(*rlp);
			switch (rlp->link_type) {

			case RLA_TYPE_VIRTUAL:
				printf("\n\t      Virtual Link: Neighbor Router-ID %s"
                                       "\n\t      Neighbor Interface-ID %s, Interface %s",
                                       ipaddr_string(&rlp->link_nrtid),
                                       ipaddr_string(&rlp->link_nifid),
                                       ipaddr_string(&rlp->link_ifid)); 
                                break;

			case RLA_TYPE_ROUTER:
				printf("\n\t      Neighbor Router-ID %s"
                                       "\n\t      Neighbor Interface-ID %s, Interface %s",
                                       ipaddr_string(&rlp->link_nrtid),
                                       ipaddr_string(&rlp->link_nifid),
                                       ipaddr_string(&rlp->link_ifid)); 
				break;

			case RLA_TYPE_TRANSIT:
				printf("\n\t      Neighbor Network-ID %s"
                                       "\n\t      Neighbor Interface-ID %s, Interface %s",
				    ipaddr_string(&rlp->link_nrtid),
				    ipaddr_string(&rlp->link_nifid),
				    ipaddr_string(&rlp->link_ifid));
				break;

			default:
				printf("\n\t      Unknown Router Links Type 0x%02x",
				    rlp->link_type);
				return (0);
			}
			printf(", metric %d", EXTRACT_16BITS(&rlp->link_metric));
			rlp++;
		}
		break;

	case LS_TYPE_NETWORK | LS_SCOPE_AREA:
		TCHECK(lsap->lsa_un.un_nla.nla_options);
                printf("\n\t      Options [%s]",
                       bittok2str(ospf6_option_values, "none",
                                  EXTRACT_32BITS(&lsap->lsa_un.un_nla.nla_options)));
		printf("\n\t      Connected Routers:");
		ap = lsap->lsa_un.un_nla.nla_router;
		while ((u_char *)ap < ls_end) {
			TCHECK(*ap);
			printf("\n\t\t%s", ipaddr_string(ap));
			++ap;
		}
		break;

	case LS_TYPE_INTER_AP | LS_SCOPE_AREA:
		TCHECK(lsap->lsa_un.un_inter_ap.inter_ap_metric);
		printf(", metric %u",
			EXTRACT_32BITS(&lsap->lsa_un.un_inter_ap.inter_ap_metric) & SLA_MASK_METRIC);