589 lines
14 KiB
C
589 lines
14 KiB
C
/*
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* Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* OSPF support contributed by Jeffrey Honig (jch@mitchell.cit.cornell.edu)
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-ospf.c,v 1.31 2001/06/28 04:34:51 fenner Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <ctype.h>
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#include <stdio.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "ospf.h"
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#include "ip.h"
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struct bits {
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u_int32_t bit;
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const char *str;
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};
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static const struct bits ospf_option_bits[] = {
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{ OSPF_OPTION_T, "T" },
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{ OSPF_OPTION_E, "E" },
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{ OSPF_OPTION_MC, "MC" },
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{ 0, NULL }
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};
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static const struct bits ospf_rla_flag_bits[] = {
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{ RLA_FLAG_B, "B" },
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{ RLA_FLAG_E, "E" },
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{ RLA_FLAG_W1, "W1" },
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{ RLA_FLAG_W2, "W2" },
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{ 0, NULL }
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};
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static struct tok type2str[] = {
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{ OSPF_TYPE_UMD, "umd" },
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{ OSPF_TYPE_HELLO, "hello" },
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{ OSPF_TYPE_DB, "dd" },
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{ OSPF_TYPE_LSR, "ls_req" },
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{ OSPF_TYPE_LSU, "ls_upd" },
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{ OSPF_TYPE_LSA, "ls_ack" },
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{ 0, NULL }
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};
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static char tstr[] = " [|ospf]";
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/* Forwards */
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static inline void ospf_print_seqage(u_int32_t, time_t);
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static inline void ospf_print_bits(const struct bits *, u_char);
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static void ospf_print_ls_type(u_int, const struct in_addr *,
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const struct in_addr *, const char *);
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static int ospf_print_lshdr(const struct lsa_hdr *);
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static int ospf_print_lsa(const struct lsa *);
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static int ospf_decode_v2(const struct ospfhdr *, const u_char *);
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static inline void
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ospf_print_seqage(register u_int32_t seq, register time_t us)
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{
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register time_t sec = us % 60;
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register time_t mins = (us / 60) % 60;
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register time_t hour = us / 3600;
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printf(" S %X age ", seq);
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if (hour)
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printf("%u:%02u:%02u",
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(u_int32_t) hour, (u_int32_t) mins, (u_int32_t) sec);
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else if (mins)
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printf("%u:%02u", (u_int32_t) mins, (u_int32_t) sec);
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else
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printf("%u", (u_int32_t) sec);
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}
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static inline void
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ospf_print_bits(register const struct bits *bp, register u_char options)
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{
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register char sep = ' ';
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do {
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if (options & bp->bit) {
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printf("%c%s", sep, bp->str);
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sep = '/';
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}
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} while ((++bp)->bit);
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}
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static void
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ospf_print_ls_type(register u_int ls_type,
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register const struct in_addr *ls_stateid,
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register const struct in_addr *ls_router, register const char *fmt)
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{
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switch (ls_type) {
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case LS_TYPE_ROUTER:
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printf(" rtr %s ", ipaddr_string(ls_router));
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break;
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case LS_TYPE_NETWORK:
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printf(" net dr %s if %s",
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ipaddr_string(ls_router),
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ipaddr_string(ls_stateid));
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break;
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case LS_TYPE_SUM_IP:
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printf(" sum %s abr %s",
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ipaddr_string(ls_stateid),
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ipaddr_string(ls_router));
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break;
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case LS_TYPE_SUM_ABR:
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printf(" abr %s rtr %s",
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ipaddr_string(ls_router),
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ipaddr_string(ls_stateid));
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break;
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case LS_TYPE_ASE:
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printf(" ase %s asbr %s",
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ipaddr_string(ls_stateid),
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ipaddr_string(ls_router));
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break;
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case LS_TYPE_GROUP:
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printf(" group %s rtr %s",
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ipaddr_string(ls_stateid),
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ipaddr_string(ls_router));
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break;
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default:
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putchar(' ');
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printf(fmt, ls_type);
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break;
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}
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}
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static int
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ospf_print_lshdr(register const struct lsa_hdr *lshp)
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{
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TCHECK(lshp->ls_type);
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printf(" {"); /* } (ctags) */
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TCHECK(lshp->ls_options);
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ospf_print_bits(ospf_option_bits, lshp->ls_options);
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TCHECK(lshp->ls_seq);
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ospf_print_seqage(ntohl(lshp->ls_seq), ntohs(lshp->ls_age));
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ospf_print_ls_type(lshp->ls_type, &lshp->ls_stateid, &lshp->ls_router,
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"ls_type %d");
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return (0);
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trunc:
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return (1);
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}
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/*
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* Print a single link state advertisement. If truncated return 1, else 0.
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*/
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static int
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ospf_print_lsa(register const struct lsa *lsap)
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{
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register const u_char *ls_end;
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register const struct rlalink *rlp;
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register const struct tos_metric *tosp;
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register const struct in_addr *ap;
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register const struct aslametric *almp;
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register const struct mcla *mcp;
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register const u_int32_t *lp;
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register int j, k;
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if (ospf_print_lshdr(&lsap->ls_hdr))
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return (1);
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TCHECK(lsap->ls_hdr.ls_length);
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ls_end = (u_char *)lsap + ntohs(lsap->ls_hdr.ls_length);
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switch (lsap->ls_hdr.ls_type) {
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case LS_TYPE_ROUTER:
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TCHECK(lsap->lsa_un.un_rla.rla_flags);
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ospf_print_bits(ospf_rla_flag_bits,
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lsap->lsa_un.un_rla.rla_flags);
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TCHECK(lsap->lsa_un.un_rla.rla_count);
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j = ntohs(lsap->lsa_un.un_rla.rla_count);
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TCHECK(lsap->lsa_un.un_rla.rla_link);
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rlp = lsap->lsa_un.un_rla.rla_link;
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while (j--) {
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TCHECK(*rlp);
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printf(" {"); /* } (ctags) */
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switch (rlp->link_type) {
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case RLA_TYPE_VIRTUAL:
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printf(" virt");
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/* Fall through */
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case RLA_TYPE_ROUTER:
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printf(" nbrid %s if %s",
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ipaddr_string(&rlp->link_id),
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ipaddr_string(&rlp->link_data));
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break;
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case RLA_TYPE_TRANSIT:
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printf(" dr %s if %s",
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ipaddr_string(&rlp->link_id),
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ipaddr_string(&rlp->link_data));
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break;
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case RLA_TYPE_STUB:
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printf(" net %s mask %s",
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ipaddr_string(&rlp->link_id),
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ipaddr_string(&rlp->link_data));
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break;
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default:
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/* { (ctags) */
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printf(" ??RouterLinksType %d?? }",
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rlp->link_type);
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return (0);
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}
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printf(" tos 0 metric %d", ntohs(rlp->link_tos0metric));
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tosp = (struct tos_metric *)
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((sizeof rlp->link_tos0metric) + (u_char *) rlp);
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for (k = 0; k < (int) rlp->link_toscount; ++k, ++tosp) {
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TCHECK(*tosp);
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printf(" tos %d metric %d",
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tosp->tos_type,
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ntohs(tosp->tos_metric));
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}
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/* { (ctags) */
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printf(" }");
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rlp = (struct rlalink *)((u_char *)(rlp + 1) +
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((rlp->link_toscount) * sizeof(*tosp)));
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}
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break;
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case LS_TYPE_NETWORK:
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TCHECK(lsap->lsa_un.un_nla.nla_mask);
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printf(" mask %s rtrs",
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ipaddr_string(&lsap->lsa_un.un_nla.nla_mask));
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ap = lsap->lsa_un.un_nla.nla_router;
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while ((u_char *)ap < ls_end) {
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TCHECK(*ap);
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printf(" %s", ipaddr_string(ap));
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++ap;
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}
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break;
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case LS_TYPE_SUM_IP:
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TCHECK(lsap->lsa_un.un_nla.nla_mask);
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printf(" mask %s",
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ipaddr_string(&lsap->lsa_un.un_sla.sla_mask));
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/* Fall through */
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case LS_TYPE_SUM_ABR:
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TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
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lp = lsap->lsa_un.un_sla.sla_tosmetric;
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while ((u_char *)lp < ls_end) {
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register u_int32_t ul;
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TCHECK(*lp);
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ul = ntohl(*lp);
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printf(" tos %d metric %d",
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(ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS,
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ul & SLA_MASK_METRIC);
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++lp;
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}
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break;
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case LS_TYPE_ASE:
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TCHECK(lsap->lsa_un.un_nla.nla_mask);
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printf(" mask %s",
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ipaddr_string(&lsap->lsa_un.un_asla.asla_mask));
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TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
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almp = lsap->lsa_un.un_asla.asla_metric;
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while ((u_char *)almp < ls_end) {
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register u_int32_t ul;
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TCHECK(almp->asla_tosmetric);
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ul = ntohl(almp->asla_tosmetric);
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printf(" type %d tos %d metric %d",
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(ul & ASLA_FLAG_EXTERNAL) ? 2 : 1,
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(ul & ASLA_MASK_TOS) >> ASLA_SHIFT_TOS,
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(ul & ASLA_MASK_METRIC));
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TCHECK(almp->asla_forward);
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if (almp->asla_forward.s_addr) {
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printf(" forward %s",
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ipaddr_string(&almp->asla_forward));
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}
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TCHECK(almp->asla_tag);
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if (almp->asla_tag.s_addr) {
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printf(" tag %s",
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ipaddr_string(&almp->asla_tag));
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}
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++almp;
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}
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break;
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case LS_TYPE_GROUP:
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/* Multicast extensions as of 23 July 1991 */
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mcp = lsap->lsa_un.un_mcla;
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while ((u_char *)mcp < ls_end) {
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TCHECK(mcp->mcla_vid);
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switch (ntohl(mcp->mcla_vtype)) {
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case MCLA_VERTEX_ROUTER:
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printf(" rtr rtrid %s",
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ipaddr_string(&mcp->mcla_vid));
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break;
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case MCLA_VERTEX_NETWORK:
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printf(" net dr %s",
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ipaddr_string(&mcp->mcla_vid));
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break;
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default:
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printf(" ??VertexType %u??",
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(u_int32_t)ntohl(mcp->mcla_vtype));
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break;
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}
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++mcp;
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}
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}
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/* { (ctags) */
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fputs(" }", stdout);
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return (0);
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trunc:
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fputs(" }", stdout);
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return (1);
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}
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static int
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ospf_decode_v2(register const struct ospfhdr *op,
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register const u_char *dataend)
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{
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register const struct in_addr *ap;
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register const struct lsr *lsrp;
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register const struct lsa_hdr *lshp;
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register const struct lsa *lsap;
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register char sep;
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register int i;
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switch (op->ospf_type) {
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case OSPF_TYPE_UMD:
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/*
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* Rob Coltun's special monitoring packets;
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* do nothing
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*/
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break;
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case OSPF_TYPE_HELLO:
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if (vflag) {
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TCHECK(op->ospf_hello.hello_deadint);
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ospf_print_bits(ospf_option_bits,
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op->ospf_hello.hello_options);
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printf(" mask %s int %d pri %d dead %u",
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ipaddr_string(&op->ospf_hello.hello_mask),
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ntohs(op->ospf_hello.hello_helloint),
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op->ospf_hello.hello_priority,
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(u_int32_t)ntohl(op->ospf_hello.hello_deadint));
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}
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TCHECK(op->ospf_hello.hello_dr);
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if (op->ospf_hello.hello_dr.s_addr != 0)
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printf(" dr %s",
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ipaddr_string(&op->ospf_hello.hello_dr));
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TCHECK(op->ospf_hello.hello_bdr);
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if (op->ospf_hello.hello_bdr.s_addr != 0)
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printf(" bdr %s",
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ipaddr_string(&op->ospf_hello.hello_bdr));
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if (vflag) {
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ap = op->ospf_hello.hello_neighbor;
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if ((u_char *)ap < dataend)
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printf(" nbrs");
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while ((u_char *)ap < dataend) {
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TCHECK(*ap);
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printf(" %s", ipaddr_string(ap));
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++ap;
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}
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}
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break; /* HELLO */
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case OSPF_TYPE_DB:
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TCHECK(op->ospf_db.db_options);
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ospf_print_bits(ospf_option_bits, op->ospf_db.db_options);
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sep = ' ';
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TCHECK(op->ospf_db.db_flags);
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if (op->ospf_db.db_flags & OSPF_DB_INIT) {
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printf("%cI", sep);
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sep = '/';
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}
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if (op->ospf_db.db_flags & OSPF_DB_MORE) {
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printf("%cM", sep);
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sep = '/';
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}
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if (op->ospf_db.db_flags & OSPF_DB_MASTER) {
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printf("%cMS", sep);
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sep = '/';
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}
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TCHECK(op->ospf_db.db_seq);
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printf(" S %X", (u_int32_t)ntohl(op->ospf_db.db_seq));
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if (vflag) {
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/* Print all the LS adv's */
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lshp = op->ospf_db.db_lshdr;
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while (!ospf_print_lshdr(lshp)) {
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/* { (ctags) */
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printf(" }");
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++lshp;
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}
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}
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break;
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case OSPF_TYPE_LSR:
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if (vflag) {
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lsrp = op->ospf_lsr;
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while ((u_char *)lsrp < dataend) {
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TCHECK(*lsrp);
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printf(" {"); /* } (ctags) */
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ospf_print_ls_type(ntohl(lsrp->ls_type),
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&lsrp->ls_stateid,
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&lsrp->ls_router,
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"LinkStateType %d");
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/* { (ctags) */
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printf(" }");
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++lsrp;
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}
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}
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break;
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case OSPF_TYPE_LSU:
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if (vflag) {
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lsap = op->ospf_lsu.lsu_lsa;
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TCHECK(op->ospf_lsu.lsu_count);
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i = ntohl(op->ospf_lsu.lsu_count);
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while (i--) {
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if (ospf_print_lsa(lsap))
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goto trunc;
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lsap = (struct lsa *)((u_char *)lsap +
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ntohs(lsap->ls_hdr.ls_length));
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}
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}
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break;
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case OSPF_TYPE_LSA:
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if (vflag) {
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lshp = op->ospf_lsa.lsa_lshdr;
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while (!ospf_print_lshdr(lshp)) {
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/* { (ctags) */
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printf(" }");
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++lshp;
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}
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}
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break;
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default:
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printf("v2 type %d", op->ospf_type);
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break;
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}
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return (0);
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trunc:
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return (1);
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}
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void
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ospf_print(register const u_char *bp, register u_int length,
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register const u_char *bp2)
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{
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register const struct ospfhdr *op;
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register const struct ip *ip;
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register const u_char *dataend;
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|
register const char *cp;
|
|
|
|
op = (struct ospfhdr *)bp;
|
|
ip = (struct ip *)bp2;
|
|
|
|
/* XXX Before we do anything else, strip off the MD5 trailer */
|
|
TCHECK(op->ospf_authtype);
|
|
if (ntohs(op->ospf_authtype) == OSPF_AUTH_MD5) {
|
|
length -= OSPF_AUTH_MD5_LEN;
|
|
snapend -= OSPF_AUTH_MD5_LEN;
|
|
}
|
|
|
|
/* If the type is valid translate it, or just print the type */
|
|
/* value. If it's not valid, say so and return */
|
|
TCHECK(op->ospf_type);
|
|
cp = tok2str(type2str, "type%d", op->ospf_type);
|
|
printf("OSPFv%d-%s %d:", op->ospf_version, cp, length);
|
|
if (*cp == 't')
|
|
return;
|
|
|
|
TCHECK(op->ospf_len);
|
|
if (length != ntohs(op->ospf_len)) {
|
|
printf(" [len %d]", ntohs(op->ospf_len));
|
|
return;
|
|
}
|
|
dataend = bp + length;
|
|
|
|
/* Print the routerid if it is not the same as the source */
|
|
TCHECK(op->ospf_routerid);
|
|
if (ip->ip_src.s_addr != op->ospf_routerid.s_addr)
|
|
printf(" rtrid %s", ipaddr_string(&op->ospf_routerid));
|
|
|
|
TCHECK(op->ospf_areaid);
|
|
if (op->ospf_areaid.s_addr != 0)
|
|
printf(" area %s", ipaddr_string(&op->ospf_areaid));
|
|
else
|
|
printf(" backbone");
|
|
|
|
if (vflag) {
|
|
/* Print authentication data (should we really do this?) */
|
|
TCHECK2(op->ospf_authdata[0], sizeof(op->ospf_authdata));
|
|
switch (ntohs(op->ospf_authtype)) {
|
|
|
|
case OSPF_AUTH_NONE:
|
|
break;
|
|
|
|
case OSPF_AUTH_SIMPLE:
|
|
printf(" auth \"");
|
|
(void)fn_printn(op->ospf_authdata,
|
|
sizeof(op->ospf_authdata), NULL);
|
|
printf("\"");
|
|
break;
|
|
|
|
case OSPF_AUTH_MD5:
|
|
printf(" auth MD5");
|
|
break;
|
|
|
|
default:
|
|
printf(" ??authtype-%d??", ntohs(op->ospf_authtype));
|
|
return;
|
|
}
|
|
}
|
|
/* Do rest according to version. */
|
|
switch (op->ospf_version) {
|
|
|
|
case 2:
|
|
/* ospf version 2 */
|
|
if (ospf_decode_v2(op, dataend))
|
|
goto trunc;
|
|
break;
|
|
|
|
default:
|
|
printf(" ospf [version %d]", op->ospf_version);
|
|
break;
|
|
} /* end switch on version */
|
|
|
|
return;
|
|
trunc:
|
|
fputs(tstr, stdout);
|
|
}
|