2 * Copyright (c) 2000 William C. Fenner.
5 * Kevin Steves <ks@hp.se> July 2000
7 * - print version, type string and packet length
8 * - print IP address count if > 1 (-v)
9 * - verify checksum (-v)
10 * - print authentication string (-v)
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that: (1) source code
14 * distributions retain the above copyright notice and this paragraph
15 * in its entirety, and (2) distributions including binary code include
16 * the above copyright notice and this paragraph in its entirety in
17 * the documentation or other materials provided with the distribution.
18 * The name of William C. Fenner may not be used to endorse or
19 * promote products derived from this software without specific prior
20 * written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND
21 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
22 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE.
26 #define NETDISSECT_REWORKED
31 #include <tcpdump-stdinc.h>
33 #include "interface.h"
35 #include "addrtoname.h"
43 * 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
44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
45 * |Version| Type | Virtual Rtr ID| Priority | Count IP Addrs|
46 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
47 * | Auth Type | Adver Int | Checksum |
48 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
50 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
54 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
56 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
57 * | Authentication Data (1) |
58 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
59 * | Authentication Data (2) |
60 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
66 * 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
67 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
68 * | IPv4 Fields or IPv6 Fields |
71 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
72 * |Version| Type | Virtual Rtr ID| Priority |Count IPvX Addr|
73 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
74 * |(rsvd) | Max Adver Int | Checksum |
75 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
78 * | IPvX Address(es) |
81 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
85 #define VRRP_TYPE_ADVERTISEMENT 1
87 static const struct tok type2str[] = {
88 { VRRP_TYPE_ADVERTISEMENT, "Advertisement" },
93 #define VRRP_AUTH_NONE 0
94 #define VRRP_AUTH_SIMPLE 1
95 #define VRRP_AUTH_AH 2
97 static const struct tok auth2str[] = {
98 { VRRP_AUTH_NONE, "none" },
99 { VRRP_AUTH_SIMPLE, "simple" },
100 { VRRP_AUTH_AH, "ah" },
105 vrrp_print(netdissect_options *ndo,
106 register const u_char *bp, register u_int len,
107 register const u_char *bp2, int ttl)
109 int version, type, auth_type = VRRP_AUTH_NONE; /* keep compiler happy */
113 version = (bp[0] & 0xf0) >> 4;
115 type_s = tok2str(type2str, "unknown type (%u)", type);
116 ND_PRINT((ndo, "VRRPv%u, %s", version, type_s));
118 ND_PRINT((ndo, ", (ttl %u)", ttl));
119 if (version < 2 || version > 3 || type != VRRP_TYPE_ADVERTISEMENT)
122 ND_PRINT((ndo, ", vrid %u, prio %u", bp[1], bp[2]));
127 ND_PRINT((ndo, ", authtype %s", tok2str(auth2str, NULL, auth_type)));
128 ND_PRINT((ndo, ", intvl %us, length %u", bp[5], len));
129 } else { /* version == 3 */
130 uint16_t intvl = (bp[4] & 0x0f) << 8 | bp[5];
131 ND_PRINT((ndo, ", intvl %ucs, length %u", intvl, len));
134 if (ndo->ndo_vflag) {
139 if (version == 2 && ND_TTEST2(bp[0], len)) {
140 struct cksum_vec vec[1];
144 if (in_cksum(vec, 1))
145 ND_PRINT((ndo, ", (bad vrrp cksum %x)",
146 EXTRACT_16BITS(&bp[6])));
149 if (version == 3 && ND_TTEST2(bp[0], len)) {
150 uint16_t cksum = nextproto4_cksum(ndo, (struct ip *)bp2, bp,
151 len, len, IPPROTO_VRRP);
153 ND_PRINT((ndo, ", (bad vrrp cksum %x)",
154 EXTRACT_16BITS(&bp[6])));
157 ND_PRINT((ndo, ", addrs"));
159 ND_PRINT((ndo, "(%d)", naddrs));
160 ND_PRINT((ndo, ":"));
163 for (i = 0; i < naddrs; i++) {
165 ND_PRINT((ndo, "%c%s", c, ipaddr_string(ndo, bp)));
169 if (version == 2 && auth_type == VRRP_AUTH_SIMPLE) { /* simple text password */
171 ND_PRINT((ndo, " auth \""));
172 if (fn_printn(ndo, bp, 8, ndo->ndo_snapend)) {
173 ND_PRINT((ndo, "\""));
176 ND_PRINT((ndo, "\""));
181 ND_PRINT((ndo, "[|vrrp]"));