/* packet-vrrp.c * Routines for the Virtual Router Redundancy Protocol (VRRP) * RFC2338 * * Heikki Vatiainen * * $Id: packet-vrrp.c,v 1.9 2000/11/19 08:54:10 guy Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #ifdef HAVE_SYS_TYPES_H # include #endif #ifdef HAVE_NETINET_IN_H #include #endif #include #include #include "packet.h" #include "packet-ip.h" static gint proto_vrrp = -1; static gint ett_vrrp = -1; static gint ett_vrrp_ver_type = -1; static gint hf_vrrp_ver_type = -1; static gint hf_vrrp_version = -1; static gint hf_vrrp_type = -1; struct vrrp_header { #define VRRP_VERSION_MASK 0xf0 #define VRRP_TYPE_MASK 0x0f guint8 ver_type; guint8 vrouter_id; guint8 priority; guint8 count_ip_addrs; guint8 auth_type; guint8 adver_int; guint16 checksum; /* One or more IP addresses */ /* 8 octets of authentication data */ #define VRRP_AUTH_DATA_LEN 8 }; #define VRRP_TYPE_ADVERTISEMENT 1 static const value_string vrrp_type_vals[] = { {VRRP_TYPE_ADVERTISEMENT, "Advertisement"} }; #define VRRP_AUTH_TYPE_NONE 0 #define VRRP_AUTH_TYPE_SIMPLE_TEXT 1 #define VRRP_AUTH_TYPE_IP_AUTH_HDR 2 static const value_string vrrp_auth_vals[] = { {VRRP_AUTH_TYPE_NONE, "No Authentication"}, {VRRP_AUTH_TYPE_SIMPLE_TEXT, "Simple Text Authentication"}, {VRRP_AUTH_TYPE_IP_AUTH_HDR, "IP Authentication Header"} }; #define VRRP_PRIORITY_MASTER_STOPPING 0 /* Values between 1 and 254 inclusive are for backup VRRP routers */ #define VRRP_PRIORITY_DEFAULT 100 #define VRRP_PRIORITY_OWNER 255 static const value_string vrrp_prio_vals[] = { {VRRP_PRIORITY_MASTER_STOPPING, "Current Master has stopped participating in VRRP"}, {VRRP_PRIORITY_DEFAULT, "Default priority for a backup VRRP router"}, {VRRP_PRIORITY_OWNER, "This VRRP router owns the virtual router's IP address(es)"} }; static void dissect_vrrp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) { struct vrrp_header vrh; gboolean short_hdr = FALSE; gboolean short_packet = FALSE; guint calculated_len = -1; /* initialize to silence false warning from gcc */ OLD_CHECK_DISPLAY_AS_DATA(proto_vrrp, pd, offset, fd, tree); if (sizeof(struct vrrp_header) > END_OF_FRAME) short_hdr = short_packet = TRUE; else { memcpy(&vrh, pd + offset, sizeof(struct vrrp_header)); calculated_len = sizeof(struct vrrp_header) + vrh.count_ip_addrs*4 + VRRP_AUTH_DATA_LEN; if (calculated_len > END_OF_FRAME) short_packet = TRUE; } if (check_col(fd, COL_PROTOCOL)) col_set_str(fd, COL_PROTOCOL, "VRRP"); if (check_col(fd, COL_INFO)) { if (short_hdr) col_add_fstr(fd, COL_INFO, "Short packet header, length %u", END_OF_FRAME); else if (short_packet) col_add_fstr(fd, COL_INFO, "Packet length mismatch, calculated %u, real %u", calculated_len, END_OF_FRAME); else col_add_fstr(fd, COL_INFO, "%s (v%u)", "Announcement", hi_nibble(vrh.ver_type)); } if (tree) { proto_item *ti, *tv; proto_tree *vrrp_tree, *ver_type_tree; guint8 ip_count, auth_len, auth_buf[VRRP_AUTH_DATA_LEN+1]; if (short_hdr) { old_dissect_data(pd, offset, fd, tree); return; } ti = proto_tree_add_item(tree, proto_vrrp, NullTVB, offset, END_OF_FRAME, FALSE); vrrp_tree = proto_item_add_subtree(ti, ett_vrrp); tv = proto_tree_add_uint_format(vrrp_tree, hf_vrrp_ver_type, NullTVB, offset, 1, vrh.ver_type, "Version %u, Packet type %u (%s)", hi_nibble(vrh.ver_type), lo_nibble(vrh.ver_type), val_to_str(lo_nibble(vrh.ver_type), vrrp_type_vals, "Unknown")); ver_type_tree = proto_item_add_subtree(tv, ett_vrrp_ver_type); proto_tree_add_uint(ver_type_tree, hf_vrrp_version, NullTVB, offset, 1, vrh.ver_type); proto_tree_add_uint(ver_type_tree, hf_vrrp_type, NullTVB, offset, 1, vrh.ver_type); offset++; proto_tree_add_text(vrrp_tree, NullTVB, offset++, 1, "Virtual Router ID: %u", vrh.vrouter_id); proto_tree_add_text(vrrp_tree, NullTVB, offset++, 1, "Priority: %u (%s)", vrh.priority, val_to_str(vrh.priority, vrrp_prio_vals, "Non-default backup priority")); proto_tree_add_text(vrrp_tree, NullTVB, offset++, 1, "Count IP Addrs: %u", vrh.count_ip_addrs); proto_tree_add_text(vrrp_tree, NullTVB, offset++, 1, "Authentication Type: %u (%s)", vrh.auth_type, val_to_str(vrh.auth_type, vrrp_auth_vals, "Unknown")); proto_tree_add_text(vrrp_tree, NullTVB, offset++, 1, "Advertisement Interval: %u second%s", vrh.adver_int, plurality(vrh.adver_int, "", "s")); proto_tree_add_text(vrrp_tree, NullTVB, offset, 2, "Checksum: 0x%x", htons(vrh.checksum)); offset+=2; if (short_packet) { old_dissect_data(pd, offset, fd, vrrp_tree); return; } ip_count = vrh.count_ip_addrs; while (ip_count > 0) { proto_tree_add_text(vrrp_tree, NullTVB, offset, 4, "Virtual Router IP address: %s", ip_to_str(pd+offset)); offset+=4; ip_count--; } if (vrh.auth_type != VRRP_AUTH_TYPE_SIMPLE_TEXT) return; /* Contents of the authentication data is undefined */ strncpy(auth_buf, pd+offset, VRRP_AUTH_DATA_LEN); auth_buf[VRRP_AUTH_DATA_LEN] = '\0'; auth_len = strlen(auth_buf); if (auth_len > 0) proto_tree_add_text(vrrp_tree, NullTVB, offset, auth_len, "Authentication string: `%s'", auth_buf); offset+=8; } return; } void proto_register_vrrp(void) { static hf_register_info hf[] = { { &hf_vrrp_ver_type, {"VRRP message version and type", "vrrp.typever", FT_UINT8, BASE_DEC, NULL, 0x0, "VRRP version and type"}}, { &hf_vrrp_version, {"VRRP protocol version", "vrrp.version", FT_UINT8, BASE_DEC, NULL, VRRP_VERSION_MASK, "VRRP version"}}, { &hf_vrrp_type, {"VRRP packet type", "vrrp.type", FT_UINT8, BASE_DEC, VALS(vrrp_type_vals), VRRP_TYPE_MASK, "VRRP type"}} }; static gint *ett[] = { &ett_vrrp, &ett_vrrp_ver_type }; proto_vrrp = proto_register_protocol("Virtual Router Redundancy Protocol", "vrrp"); proto_register_field_array(proto_vrrp, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); return; } void proto_reg_handoff_vrrp(void) { old_dissector_add("ip.proto", IP_PROTO_VRRP, dissect_vrrp); }