184 lines
6.3 KiB
C
184 lines
6.3 KiB
C
/*
|
|
* Copyright (c) 2000 William C. Fenner.
|
|
* All rights reserved.
|
|
*
|
|
* Kevin Steves <ks@hp.se> July 2000
|
|
* Modified to:
|
|
* - print version, type string and packet length
|
|
* - print IP address count if > 1 (-v)
|
|
* - verify checksum (-v)
|
|
* - print authentication string (-v)
|
|
*
|
|
* 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, and (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.
|
|
* The name of William C. Fenner may not 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.
|
|
*/
|
|
|
|
/* \summary: Virtual Router Redundancy Protocol (VRRP) printer */
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <netdissect-stdinc.h>
|
|
|
|
#include "netdissect.h"
|
|
#include "extract.h"
|
|
#include "addrtoname.h"
|
|
|
|
#include "ip.h"
|
|
#include "ipproto.h"
|
|
/*
|
|
* RFC 2338 (VRRP v2):
|
|
*
|
|
* 0 1 2 3
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* |Version| Type | Virtual Rtr ID| Priority | Count IP Addrs|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | Auth Type | Adver Int | Checksum |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | IP Address (1) |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | . |
|
|
* | . |
|
|
* | . |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | IP Address (n) |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | Authentication Data (1) |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | Authentication Data (2) |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*
|
|
*
|
|
* RFC 5798 (VRRP v3):
|
|
*
|
|
* 0 1 2 3
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | IPv4 Fields or IPv6 Fields |
|
|
* ... ...
|
|
* | |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* |Version| Type | Virtual Rtr ID| Priority |Count IPvX Addr|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* |(rsvd) | Max Adver Int | Checksum |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | |
|
|
* + +
|
|
* | IPvX Address(es) |
|
|
* + +
|
|
* | |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*/
|
|
|
|
/* Type */
|
|
#define VRRP_TYPE_ADVERTISEMENT 1
|
|
|
|
static const struct tok type2str[] = {
|
|
{ VRRP_TYPE_ADVERTISEMENT, "Advertisement" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
/* Auth Type */
|
|
#define VRRP_AUTH_NONE 0
|
|
#define VRRP_AUTH_SIMPLE 1
|
|
#define VRRP_AUTH_AH 2
|
|
|
|
static const struct tok auth2str[] = {
|
|
{ VRRP_AUTH_NONE, "none" },
|
|
{ VRRP_AUTH_SIMPLE, "simple" },
|
|
{ VRRP_AUTH_AH, "ah" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
void
|
|
vrrp_print(netdissect_options *ndo,
|
|
register const u_char *bp, register u_int len,
|
|
register const u_char *bp2, int ttl)
|
|
{
|
|
int version, type, auth_type = VRRP_AUTH_NONE; /* keep compiler happy */
|
|
const char *type_s;
|
|
|
|
ND_TCHECK(bp[0]);
|
|
version = (bp[0] & 0xf0) >> 4;
|
|
type = bp[0] & 0x0f;
|
|
type_s = tok2str(type2str, "unknown type (%u)", type);
|
|
ND_PRINT((ndo, "VRRPv%u, %s", version, type_s));
|
|
if (ttl != 255)
|
|
ND_PRINT((ndo, ", (ttl %u)", ttl));
|
|
if (version < 2 || version > 3 || type != VRRP_TYPE_ADVERTISEMENT)
|
|
return;
|
|
ND_TCHECK(bp[2]);
|
|
ND_PRINT((ndo, ", vrid %u, prio %u", bp[1], bp[2]));
|
|
ND_TCHECK(bp[5]);
|
|
|
|
if (version == 2) {
|
|
auth_type = bp[4];
|
|
ND_PRINT((ndo, ", authtype %s", tok2str(auth2str, NULL, auth_type)));
|
|
ND_PRINT((ndo, ", intvl %us, length %u", bp[5], len));
|
|
} else { /* version == 3 */
|
|
uint16_t intvl = (bp[4] & 0x0f) << 8 | bp[5];
|
|
ND_PRINT((ndo, ", intvl %ucs, length %u", intvl, len));
|
|
}
|
|
|
|
if (ndo->ndo_vflag) {
|
|
int naddrs = bp[3];
|
|
int i;
|
|
char c;
|
|
|
|
if (version == 2 && ND_TTEST2(bp[0], len)) {
|
|
struct cksum_vec vec[1];
|
|
|
|
vec[0].ptr = bp;
|
|
vec[0].len = len;
|
|
if (in_cksum(vec, 1))
|
|
ND_PRINT((ndo, ", (bad vrrp cksum %x)",
|
|
EXTRACT_16BITS(&bp[6])));
|
|
}
|
|
|
|
if (version == 3 && ND_TTEST2(bp[0], len)) {
|
|
uint16_t cksum = nextproto4_cksum(ndo, (const struct ip *)bp2, bp,
|
|
len, len, IPPROTO_VRRP);
|
|
if (cksum)
|
|
ND_PRINT((ndo, ", (bad vrrp cksum %x)",
|
|
EXTRACT_16BITS(&bp[6])));
|
|
}
|
|
|
|
ND_PRINT((ndo, ", addrs"));
|
|
if (naddrs > 1)
|
|
ND_PRINT((ndo, "(%d)", naddrs));
|
|
ND_PRINT((ndo, ":"));
|
|
c = ' ';
|
|
bp += 8;
|
|
for (i = 0; i < naddrs; i++) {
|
|
ND_TCHECK(bp[3]);
|
|
ND_PRINT((ndo, "%c%s", c, ipaddr_string(ndo, bp)));
|
|
c = ',';
|
|
bp += 4;
|
|
}
|
|
if (version == 2 && auth_type == VRRP_AUTH_SIMPLE) { /* simple text password */
|
|
ND_TCHECK(bp[7]);
|
|
ND_PRINT((ndo, " auth \""));
|
|
if (fn_printn(ndo, bp, 8, ndo->ndo_snapend)) {
|
|
ND_PRINT((ndo, "\""));
|
|
goto trunc;
|
|
}
|
|
ND_PRINT((ndo, "\""));
|
|
}
|
|
}
|
|
return;
|
|
trunc:
|
|
ND_PRINT((ndo, "[|vrrp]"));
|
|
}
|