forked from osmocom/wireshark
301 lines
12 KiB
C
301 lines
12 KiB
C
/* packet-auto_rp.c
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* Routines for the Cisco Auto-RP protocol
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* ftp://ftpeng.cisco.com/ftp/ipmulticast/specs/pim-autorp-spec01.txt
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*
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* Heikki Vatiainen <hessu@cs.tut.fi>
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*
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* $Id: packet-auto_rp.c,v 1.6 2000/05/31 05:06:53 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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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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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.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 "packet.h"
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#include "resolv.h"
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static gint proto_auto_rp = -1;
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static gint ett_auto_rp = -1;
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static gint ett_auto_rp_ver_type = -1;
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static gint ett_auto_rp_map = -1;
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static gint ett_auto_rp_group = -1;
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static gint hf_auto_rp_ver_type = -1;
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static gint hf_auto_rp_version = -1;
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static gint hf_auto_rp_type = -1;
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static gint hf_auto_rp_map = -1;
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static gint hf_auto_rp_pim_ver = -1;
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static gint hf_auto_rp_group = -1;
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static gint hf_auto_rp_mask_sgn = -1;
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#define UDP_PORT_PIM_RP_DISC 496
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struct auto_rp_fixed_hdr {
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#define AUTO_RP_VERSION_MASK 0xf0
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#define AUTO_RP_TYPE_MASK 0x0f
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guint8 ver_type; /* pim-autorp-spec01.txt defines version 1+ */
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guint8 rp_count; /* Number of struct auto_rp_maps that follow the this header */
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guint16 holdtime; /* Time in seconds this announcement is valid. 0 equals forever */
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guint32 reserved;
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};
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struct auto_rp_map_hdr {
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guint32 rp_address; /* The unicast IPv4 address of this RP */
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#define AUTO_RP_PIM_VER_MASK 0x03
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guint8 pim_version; /* RP's highest PIM version. 2-bit field */
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guint8 group_count; /* Number of encoded group addresses that follow this header */
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};
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struct auto_rp_enc_grp_hdr { /* Encoded group address */
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#define AUTO_RP_SIGN_MASK 0x01
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guint8 prefix_sgn; /* 0 positive, 1 negative group prefix */
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guint8 mask_len; /* Length of group prefix */
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guint32 addr; /* Group prefix */
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};
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#define AUTO_RP_VER_1PLUS 1
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static const value_string auto_rp_ver_vals[] = {
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{AUTO_RP_VER_1PLUS, "1 or 1+"},
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{0, NULL}
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};
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#define AUTO_RP_TYPE_ANNOUNCEMENT 1
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#define AUTO_RP_TYPE_MAPPING 2
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static const value_string auto_rp_type_vals[] = {
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{AUTO_RP_TYPE_ANNOUNCEMENT, "RP announcement"},
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{AUTO_RP_TYPE_MAPPING, "RP mapping"},
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{0, NULL}
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};
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#define AUTO_RP_PIM_VERSION_UNKNOWN 0x00
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#define AUTO_RP_PIM_VERSION_1 0x01
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#define AUTO_RP_PIM_VERSION_2 0x02
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#define AUTO_RP_PIM_VERSION_DUAL 0x03
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static const value_string auto_rp_pim_ver_vals[] = {
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{AUTO_RP_PIM_VERSION_UNKNOWN, "Version unknown"},
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{AUTO_RP_PIM_VERSION_1, "Version 1"},
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{AUTO_RP_PIM_VERSION_2, "Version 2"},
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{AUTO_RP_PIM_VERSION_DUAL, "Dual version 1 and 2"},
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{0, NULL}
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};
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#define AUTO_RP_GROUP_MASK_SIGN_POS 0
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#define AUTO_RP_GROUP_MASK_SIGN_NEG 1
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static const value_string auto_rp_mask_sign_vals[] = {
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{AUTO_RP_GROUP_MASK_SIGN_POS, "Positive group prefix"},
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{AUTO_RP_GROUP_MASK_SIGN_NEG, "Negative group prefix"},
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{0, NULL}
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};
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static int do_auto_rp_map(const u_char *pd, int offset, frame_data *fd, proto_tree *auto_rp_tree);
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static void dissect_auto_rp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
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{
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struct auto_rp_fixed_hdr arh;
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gboolean short_hdr = FALSE;
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if (sizeof(struct auto_rp_fixed_hdr) > END_OF_FRAME)
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short_hdr = TRUE;
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else
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memcpy(&arh, pd + offset, sizeof(struct auto_rp_fixed_hdr));
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "Auto-RP");
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if (check_col(fd, COL_INFO)) {
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if (short_hdr)
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col_add_fstr(fd, COL_INFO, "Short packet header, length %u", END_OF_FRAME);
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else
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col_add_fstr(fd, COL_INFO, "%s (v%s) for %u RP%s",
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val_to_str(lo_nibble(arh.ver_type), auto_rp_type_vals, "Unknown"),
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val_to_str(hi_nibble(arh.ver_type), auto_rp_ver_vals, "Unknown"),
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arh.rp_count, plurality(arh.rp_count, "", "s"));
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}
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if (tree) {
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proto_item *ti, *tv;
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proto_tree *auto_rp_tree, *ver_type_tree;
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int i;
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if (short_hdr) {
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dissect_data(pd, offset, fd, tree);
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return;
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}
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ti = proto_tree_add_item(tree, proto_auto_rp, NullTVB, offset, END_OF_FRAME, FALSE);
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auto_rp_tree = proto_item_add_subtree(ti, ett_auto_rp);
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tv = proto_tree_add_uint_format(auto_rp_tree, hf_auto_rp_ver_type, NullTVB, offset, 1,
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arh.ver_type, "Version: %s, Packet type: %s",
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val_to_str(hi_nibble(arh.ver_type), auto_rp_ver_vals, "Unknown"),
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val_to_str(lo_nibble(arh.ver_type), auto_rp_type_vals, "Unknown"));
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ver_type_tree = proto_item_add_subtree(tv, ett_auto_rp_ver_type);
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proto_tree_add_uint(ver_type_tree, hf_auto_rp_version, NullTVB, offset, 1, arh.ver_type);
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proto_tree_add_uint(ver_type_tree, hf_auto_rp_type, NullTVB, offset, 1, arh.ver_type);
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offset++;
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proto_tree_add_text(auto_rp_tree, NullTVB, offset++, 1, "RP Count: %u", arh.rp_count);
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proto_tree_add_text(auto_rp_tree, NullTVB, offset, 2, "Holdtime: %u second%s",
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ntohs(arh.holdtime),
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plurality(ntohs(arh.holdtime), "", "s"));
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offset+=2;
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proto_tree_add_text(auto_rp_tree, NullTVB, offset, 4, "Reserved: 0x%x", arh.reserved);
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offset+=4;
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for (i = 0; i < arh.rp_count; i++) {
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int ret;
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if (sizeof(struct auto_rp_map_hdr) > END_OF_FRAME)
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break;
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ret = do_auto_rp_map(pd, offset, fd, auto_rp_tree);
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if (ret < 0)
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break;
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offset += ret;
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}
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if (END_OF_FRAME > 0)
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dissect_data(pd, offset, fd, tree);
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}
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return;
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}
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void proto_register_auto_rp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_auto_rp_ver_type,
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{"Auto-RP message version and type", "auto_rp.typever",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Auto-RP version and type"}},
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{ &hf_auto_rp_version,
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{"Auto-RP protocol version", "auto_rp.version",
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FT_UINT8, BASE_DEC, VALS(auto_rp_ver_vals), AUTO_RP_VERSION_MASK,
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"Auto-RP version"}},
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{ &hf_auto_rp_type,
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{"Auto-RP packet type", "auto_rp.type",
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FT_UINT8, BASE_DEC, VALS(auto_rp_type_vals), AUTO_RP_TYPE_MASK,
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"Auto-RP type"}},
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{ &hf_auto_rp_map,
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{"Auto-RP address map", "auto_rp.map",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Auto-RP mapping"}},
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{ &hf_auto_rp_pim_ver,
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{"RP's highest PIM version", "auto_rp.pim_ver",
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FT_UINT8, BASE_DEC, VALS(auto_rp_pim_ver_vals), AUTO_RP_PIM_VER_MASK,
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"Auto-RP PIM version"}},
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{ &hf_auto_rp_group,
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{"Group mapping to this RP", "auto_rp.grp",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"RP's group"}},
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{ &hf_auto_rp_mask_sgn,
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{"Group prefix sign", "auto_rp.mask_sgn",
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FT_UINT8, BASE_DEC, VALS(auto_rp_mask_sign_vals), AUTO_RP_SIGN_MASK,
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"Prefix sign"}}
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};
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static gint *ett[] = {
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&ett_auto_rp,
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&ett_auto_rp_ver_type,
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&ett_auto_rp_map,
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&ett_auto_rp_group
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};
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proto_auto_rp = proto_register_protocol("Cisco Auto-RP", "auto_rp");
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proto_register_field_array(proto_auto_rp, 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_auto_rp(void)
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{
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dissector_add("udp.port", UDP_PORT_PIM_RP_DISC, dissect_auto_rp);
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}
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/*
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* Handles one Auto-RP map entry. Returns the number of bytes in the map entry or < 0 for error.
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*/
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static int do_auto_rp_map(const u_char *pd, int offset, frame_data *fd, proto_tree *auto_rp_tree)
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{
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struct auto_rp_map_hdr m;
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proto_item *ti;
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proto_tree *map_tree;
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struct auto_rp_enc_grp_hdr g;
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int i;
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if (sizeof(struct auto_rp_map_hdr) > END_OF_FRAME)
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return -1;
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memcpy(&m, pd+offset, sizeof(struct auto_rp_map_hdr));
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ti = proto_tree_add_uint_format(auto_rp_tree, hf_auto_rp_map, NullTVB, offset,
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MIN(sizeof(m) + m.group_count*sizeof(g), END_OF_FRAME), 1,
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"RP %s: %u group%s", ip_to_str((void *)&m.rp_address),
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m.group_count, plurality(m.group_count, "", "s"));
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map_tree = proto_item_add_subtree(ti, ett_auto_rp_map);
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proto_tree_add_text(map_tree, NullTVB, offset, 4, "Unicast IP address of this RP: %s (%s)",
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ip_to_str((void *)&m.rp_address), get_hostname(m.rp_address));
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offset +=4;
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proto_tree_add_uint(map_tree, hf_auto_rp_pim_ver, NullTVB, offset, 1, pd[offset]);
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offset++;
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proto_tree_add_text(map_tree, NullTVB, offset, 1, "Number of groups this RP maps to: %u", m.group_count);
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offset++;
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for (i = 0; i < m.group_count; i++) {
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proto_item *gi;
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proto_tree *grp_tree;
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if (2*sizeof(guint8) + sizeof(guint32) > END_OF_FRAME) /* struct auto_rp_enc_grp_hdr */
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return -1;
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gi = proto_tree_add_uint_format(map_tree, hf_auto_rp_group, NullTVB, offset, 6, 1,
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"group %s/%u (%s)", ip_to_str(pd + offset + 2),
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pd[offset + 1],
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val_to_str(pd[offset]&AUTO_RP_SIGN_MASK, auto_rp_mask_sign_vals, ""));
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grp_tree = proto_item_add_subtree(gi, ett_auto_rp_group);
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proto_tree_add_uint(grp_tree, hf_auto_rp_mask_sgn, NullTVB, offset, 1, pd[offset]);
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offset++;
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proto_tree_add_text(grp_tree, NullTVB, offset, 1, "Group mask length: %u", pd[offset]);
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offset++;
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proto_tree_add_text(grp_tree, NullTVB, offset, 4, "Group prefix: %s", ip_to_str(pd + offset));
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offset +=4;
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}
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return offset;
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}
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