forked from osmocom/wireshark
303 lines
11 KiB
C
303 lines
11 KiB
C
/* packet-vrrp.c
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* Routines for the Virtual Router Redundancy Protocol (VRRP)
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* RFC2338
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*
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* Heikki Vatiainen <hessu@cs.tut.fi>
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*
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* $Id: packet-vrrp.c,v 1.27 2003/06/12 06:58:38 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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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 <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include "ipproto.h"
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#include "in_cksum.h"
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static gint proto_vrrp = -1;
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static gint ett_vrrp = -1;
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static gint ett_vrrp_ver_type = -1;
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static gint hf_vrrp_ver_type = -1;
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static gint hf_vrrp_version = -1;
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static gint hf_vrrp_type = -1;
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static gint hf_vrrp_virt_rtr_id = -1;
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static gint hf_vrrp_prio = -1;
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static gint hf_vrrp_count_ip = -1;
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static gint hf_vrrp_auth_type = -1;
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static gint hf_vrrp_adver_int = -1;
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static gint hf_vrrp_ip = -1;
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static gint hf_vrrp_ip6 = -1;
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#define VRRP_VERSION_MASK 0xf0
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#define VRRP_TYPE_MASK 0x0f
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#define VRRP_AUTH_DATA_LEN 8
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#define VRRP_TYPE_ADVERTISEMENT 1
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static const value_string vrrp_type_vals[] = {
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{VRRP_TYPE_ADVERTISEMENT, "Advertisement"},
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{0, NULL}
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};
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#define VRRP_AUTH_TYPE_NONE 0
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#define VRRP_AUTH_TYPE_SIMPLE_TEXT 1
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#define VRRP_AUTH_TYPE_IP_AUTH_HDR 2
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static const value_string vrrp_auth_vals[] = {
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{VRRP_AUTH_TYPE_NONE, "No Authentication"},
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{VRRP_AUTH_TYPE_SIMPLE_TEXT, "Simple Text Authentication"},
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{VRRP_AUTH_TYPE_IP_AUTH_HDR, "IP Authentication Header"},
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{0, NULL}
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};
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#define VRRP_PRIORITY_MASTER_STOPPING 0
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/* Values between 1 and 254 inclusive are for backup VRRP routers */
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#define VRRP_PRIORITY_DEFAULT 100
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#define VRRP_PRIORITY_OWNER 255
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static const value_string vrrp_prio_vals[] = {
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{VRRP_PRIORITY_MASTER_STOPPING, "Current Master has stopped participating in VRRP"},
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{VRRP_PRIORITY_DEFAULT, "Default priority for a backup VRRP router"},
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{VRRP_PRIORITY_OWNER, "This VRRP router owns the virtual router's IP address(es)"},
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{0, NULL }
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};
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static void
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dissect_vrrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 0;
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gint vrrp_len;
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guint8 ver_type;
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vec_t cksum_vec[4];
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guint32 phdr[2];
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "VRRP");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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ver_type = tvb_get_guint8(tvb, 0);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s (v%u)",
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"Announcement", hi_nibble(ver_type));
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}
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if (tree) {
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proto_item *ti, *tv;
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proto_tree *vrrp_tree, *ver_type_tree;
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guint8 priority, ip_count = 0, auth_type;
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guint16 cksum, computed_cksum;
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guint8 auth_buf[VRRP_AUTH_DATA_LEN + 1];
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ti = proto_tree_add_item(tree, proto_vrrp, tvb, 0, -1, FALSE);
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vrrp_tree = proto_item_add_subtree(ti, ett_vrrp);
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tv = proto_tree_add_uint_format(vrrp_tree, hf_vrrp_ver_type,
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tvb, offset, 1, ver_type,
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"Version %u, Packet type %u (%s)",
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hi_nibble(ver_type), lo_nibble(ver_type),
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val_to_str(lo_nibble(ver_type), vrrp_type_vals, "Unknown"));
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ver_type_tree = proto_item_add_subtree(tv, ett_vrrp_ver_type);
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proto_tree_add_uint(ver_type_tree, hf_vrrp_version, tvb,
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offset, 1, ver_type);
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proto_tree_add_uint(ver_type_tree, hf_vrrp_type, tvb, offset, 1,
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ver_type);
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offset++;
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proto_tree_add_item(vrrp_tree, hf_vrrp_virt_rtr_id, tvb, offset, 1, FALSE);
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offset++;
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priority = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint_format(vrrp_tree, hf_vrrp_prio, tvb, offset, 1, priority, "Priority: %u (%s)",
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priority,
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val_to_str(priority, vrrp_prio_vals, "Non-default backup priority"));
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offset++;
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switch(hi_nibble(ver_type)) {
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case 3:
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/* Skip reserve field */
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offset++;
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break;
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case 2:
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default:
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ip_count = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(vrrp_tree, hf_vrrp_count_ip, tvb,
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offset, 1, ip_count);
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offset++;
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break;
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}
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auth_type = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(vrrp_tree, hf_vrrp_auth_type, tvb, offset, 1, FALSE);
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offset++;
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proto_tree_add_item(vrrp_tree, hf_vrrp_adver_int, tvb, offset, 1, FALSE);
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offset++;
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cksum = tvb_get_ntohs(tvb, offset);
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vrrp_len = (gint)tvb_reported_length(tvb);
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if (!pinfo->fragmented && (gint)tvb_length(tvb) >= vrrp_len) {
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/* The packet isn't part of a fragmented datagram
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and isn't truncated, so we can checksum it. */
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switch(hi_nibble(ver_type)) {
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case 3:
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/* Set up the fields of the pseudo-header. */
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cksum_vec[0].ptr = pinfo->src.data;
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cksum_vec[0].len = pinfo->src.len;
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cksum_vec[1].ptr = pinfo->dst.data;
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cksum_vec[1].len = pinfo->dst.len;
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cksum_vec[2].ptr = (const guint8 *)&phdr;
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phdr[0] = g_htonl(vrrp_len);
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phdr[1] = g_htonl(IP_PROTO_VRRP);
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cksum_vec[2].len = 8;
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cksum_vec[3].ptr = tvb_get_ptr(tvb, 0, vrrp_len);
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cksum_vec[3].len = vrrp_len;
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computed_cksum = in_cksum(cksum_vec, 4);
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break;
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case 2:
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default:
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cksum_vec[0].ptr = tvb_get_ptr(tvb, 0, vrrp_len);
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cksum_vec[0].len = vrrp_len;
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computed_cksum = in_cksum(&cksum_vec[0], 1);
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break;
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}
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if (computed_cksum == 0) {
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proto_tree_add_text(vrrp_tree, tvb, offset, 2,
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"Checksum: 0x%04x (correct)",
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cksum);
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} else {
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proto_tree_add_text(vrrp_tree, tvb, offset, 2,
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"Checksum: 0x%04x (incorrect, should be 0x%04x)",
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cksum,
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in_cksum_shouldbe(cksum, computed_cksum));
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}
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} else {
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proto_tree_add_text(vrrp_tree, tvb, offset, 2,
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"Checksum: 0x%04x", cksum);
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}
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offset+=2;
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switch(hi_nibble(ver_type)) {
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case 3:
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proto_tree_add_item(vrrp_tree, hf_vrrp_ip6, tvb, offset, 16, FALSE);
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offset+=16;
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break;
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case 2:
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default:
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while (ip_count > 0) {
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proto_tree_add_item(vrrp_tree, hf_vrrp_ip, tvb,
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offset, 4, FALSE);
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offset+=4;
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ip_count--;
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}
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break;
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}
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if (auth_type != VRRP_AUTH_TYPE_SIMPLE_TEXT)
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return; /* Contents of the authentication data is undefined */
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tvb_get_nstringz0(tvb, offset, sizeof auth_buf, auth_buf);
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if (auth_buf[0] != '\0')
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proto_tree_add_text(vrrp_tree, tvb, offset,
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VRRP_AUTH_DATA_LEN,
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"Authentication string: `%s'",
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auth_buf);
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offset+=8;
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}
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}
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void proto_register_vrrp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_vrrp_ver_type,
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{"VRRP message version and type", "vrrp.typever",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"VRRP version and type", HFILL }},
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{ &hf_vrrp_version,
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{"VRRP protocol version", "vrrp.version",
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FT_UINT8, BASE_DEC, NULL, VRRP_VERSION_MASK,
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"VRRP version", HFILL }},
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{ &hf_vrrp_type,
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{"VRRP packet type", "vrrp.type",
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FT_UINT8, BASE_DEC, VALS(vrrp_type_vals), VRRP_TYPE_MASK,
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"VRRP type", HFILL }},
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{ &hf_vrrp_virt_rtr_id,
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{"Virtual Rtr ID", "vrrp.virt_rtr_id",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Virtual router this packet is reporting status for", HFILL }},
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{ &hf_vrrp_prio,
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{"Priority", "vrrp.prio",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Sending VRRP router's priority for the virtual router", HFILL }},
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{ &hf_vrrp_count_ip,
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{"Count IP Addrs", "vrrp.count_ip_addrs",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"The number of IP addresses contained in this VRRP advertisement", HFILL }},
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{ &hf_vrrp_auth_type,
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{"Auth Type", "vrrp.auth_type",
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FT_UINT8, BASE_DEC, VALS(vrrp_auth_vals), 0x0,
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"The authentication method being utilized", HFILL }},
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{ &hf_vrrp_adver_int,
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{"Adver Int", "vrrp.adver_int",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Time interval (in seconds) between ADVERTISEMENTS", HFILL }},
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{ &hf_vrrp_ip,
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{"IP Address", "vrrp.ip_addr",
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FT_IPv4, 0, NULL, 0x0,
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"IP address associated with the virtual router", HFILL }},
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{ &hf_vrrp_ip6,
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{"IPv6 Address", "vrrp.ipv6_addr",
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FT_IPv6, 0, NULL, 0x0,
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"IPv6 address associated with the virtual router", HFILL }},
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};
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static gint *ett[] = {
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&ett_vrrp,
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&ett_vrrp_ver_type
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};
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proto_vrrp = proto_register_protocol("Virtual Router Redundancy Protocol",
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"VRRP", "vrrp");
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proto_register_field_array(proto_vrrp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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return;
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}
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void
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proto_reg_handoff_vrrp(void)
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{
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dissector_handle_t vrrp_handle;
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vrrp_handle = create_dissector_handle(dissect_vrrp, proto_vrrp);
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dissector_add("ip.proto", IP_PROTO_VRRP, vrrp_handle);
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}
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