forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I92c94448e6641716d03158a5f332c8b53709423a Reviewed-on: https://code.wireshark.org/review/25756 Petri-Dish: Dario Lombardo <lomato@gmail.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
301 lines
11 KiB
C
301 lines
11 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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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/to_str.h>
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#include <wsutil/str_util.h>
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void proto_register_auto_rp(void);
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void proto_reg_handoff_auto_rp(void);
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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_version = -1;
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static gint hf_auto_rp_type = -1;
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static gint hf_auto_rp_count = -1;
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static gint hf_auto_rp_holdtime = -1;
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static gint hf_auto_rp_pim_ver = -1;
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static gint hf_auto_rp_rp_addr = -1;
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static gint hf_auto_rp_prefix_sgn = -1;
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static gint hf_auto_rp_mask_len = -1;
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static gint hf_auto_rp_group_prefix = -1;
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static gint hf_auto_rp_reserved = -1;
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static gint hf_auto_rp_trailing_junk = -1;
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static gint hf_auto_rp_group_num = -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(tvbuff_t *tvb, int offset, proto_tree *auto_rp_tree);
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static int dissect_auto_rp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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guint8 ver_type, rp_count;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "Auto-RP");
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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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rp_count = tvb_get_guint8(tvb, 1);
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s (v%s) for %u RP%s",
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val_to_str_const(lo_nibble(ver_type), auto_rp_type_vals, "Unknown"),
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val_to_str_const(hi_nibble(ver_type), auto_rp_ver_vals, "Unknown"),
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rp_count, plurality(rp_count, "", "s"));
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if (tree) {
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proto_item *ti;
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proto_tree *auto_rp_tree, *ver_type_tree;
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int i, offset;
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guint16 holdtime;
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offset = 0;
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ti = proto_tree_add_item(tree, proto_auto_rp, tvb, offset, -1, ENC_NA);
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auto_rp_tree = proto_item_add_subtree(ti, ett_auto_rp);
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ver_type_tree = proto_tree_add_subtree_format(auto_rp_tree, tvb, offset, 1,
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ett_auto_rp_ver_type, NULL, "Version: %s, Packet type: %s",
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val_to_str_const(hi_nibble(ver_type), auto_rp_ver_vals, "Unknown"),
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val_to_str_const(lo_nibble(ver_type), auto_rp_type_vals, "Unknown"));
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proto_tree_add_uint(ver_type_tree, hf_auto_rp_version, tvb, offset, 1, ver_type);
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proto_tree_add_uint(ver_type_tree, hf_auto_rp_type, tvb, offset, 1, ver_type);
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offset++;
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proto_tree_add_uint(auto_rp_tree, hf_auto_rp_count, tvb, offset, 1, rp_count);
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offset++;
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holdtime = tvb_get_ntohs(tvb, offset);
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proto_tree_add_uint_format_value(auto_rp_tree, hf_auto_rp_holdtime, tvb, offset, 2, holdtime,
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"%u second%s", holdtime, plurality(holdtime, "", "s"));
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offset+=2;
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proto_tree_add_item(auto_rp_tree, hf_auto_rp_reserved, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset+=4;
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for (i = 0; i < rp_count; i++)
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offset = do_auto_rp_map(tvb, offset, auto_rp_tree);
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if (tvb_reported_length_remaining(tvb, offset) > 0)
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proto_tree_add_item(tree, hf_auto_rp_trailing_junk, tvb, offset, -1, ENC_NA);
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}
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return tvb_captured_length(tvb);
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}
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/*
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* Handles one Auto-RP map entry. Returns the new offset.
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*/
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static int do_auto_rp_map(tvbuff_t *tvb, int offset, proto_tree *auto_rp_tree)
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{
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proto_tree *map_tree;
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guint8 group_count;
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int i;
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group_count = tvb_get_guint8(tvb, offset + 5);
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/* sizeof map header + n * sizeof encoded group addresses */
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map_tree = proto_tree_add_subtree_format(auto_rp_tree, tvb, offset, 6 + group_count * 6,
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ett_auto_rp_map, NULL,
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"RP %s: %u group%s", tvb_ip_to_str(tvb, offset),
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group_count, plurality(group_count, "", "s"));
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proto_tree_add_item(map_tree, hf_auto_rp_rp_addr, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(map_tree, hf_auto_rp_pim_ver, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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proto_tree_add_uint(map_tree, hf_auto_rp_group_num, tvb, offset, 1, group_count);
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offset++;
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for (i = 0; i < group_count; i++) {
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proto_tree *grp_tree;
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guint8 sign, mask_len;
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sign = tvb_get_guint8(tvb, offset);
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mask_len = tvb_get_guint8(tvb, offset + 1);
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grp_tree = proto_tree_add_subtree_format(map_tree, tvb, offset, 6,
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ett_auto_rp_group, NULL, "Group %s/%u (%s)",
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tvb_ip_to_str(tvb, offset + 2), mask_len,
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val_to_str_const(sign&AUTO_RP_SIGN_MASK, auto_rp_mask_sign_vals, ""));
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proto_tree_add_uint(grp_tree, hf_auto_rp_prefix_sgn, tvb, offset, 1, sign);
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offset++;
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proto_tree_add_uint(grp_tree, hf_auto_rp_mask_len, tvb, offset, 1, mask_len);
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offset++;
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proto_tree_add_item(grp_tree, hf_auto_rp_group_prefix, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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}
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return offset;
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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_version,
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{"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 protocol version", HFILL }},
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{ &hf_auto_rp_type,
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{"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 packet type", HFILL }},
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{ &hf_auto_rp_count,
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{"RP count", "auto_rp.rp_count",
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FT_UINT8, BASE_DEC, NULL, 0,
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"The number of RP addresses contained in this message", HFILL }},
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{ &hf_auto_rp_group_num,
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{"Number of groups this RP maps to", "auto_rp.group_num",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL }},
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{ &hf_auto_rp_holdtime,
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{"Holdtime", "auto_rp.holdtime",
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FT_UINT16, BASE_DEC, NULL, 0,
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"The amount of time in seconds this announcement is valid", HFILL }},
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{ &hf_auto_rp_pim_ver,
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{"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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"RP's highest PIM version", HFILL }},
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{ &hf_auto_rp_rp_addr,
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{"RP address", "auto_rp.rp_addr",
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FT_IPv4, BASE_NONE, NULL, 0,
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"The unicast IP address of the RP", HFILL }},
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{ &hf_auto_rp_prefix_sgn,
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{"Sign", "auto_rp.prefix_sign",
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FT_UINT8, BASE_DEC, VALS(auto_rp_mask_sign_vals), AUTO_RP_SIGN_MASK,
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"Group prefix sign", HFILL }},
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{ &hf_auto_rp_mask_len,
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{"Mask length", "auto_rp.mask_len",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Length of group prefix", HFILL }},
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{ &hf_auto_rp_group_prefix,
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{"Prefix", "auto_rp.group_prefix",
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FT_IPv4, BASE_NONE, NULL, 0,
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"Group prefix", HFILL }},
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{ &hf_auto_rp_reserved,
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{"Reserved", "auto_rp.reserved",
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FT_UINT32, BASE_HEX, NULL, 0,
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NULL, HFILL }},
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{ &hf_auto_rp_trailing_junk,
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{"Trailing junk", "auto_rp.trailing_junk",
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FT_BYTES, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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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", "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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}
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void
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proto_reg_handoff_auto_rp(void)
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{
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dissector_handle_t auto_rp_handle;
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auto_rp_handle = create_dissector_handle(dissect_auto_rp, proto_auto_rp);
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dissector_add_uint_with_preference("udp.port", UDP_PORT_PIM_RP_DISC, auto_rp_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 expandtab:
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* :indentSize=8:tabSize=8:noTabs=true:
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*/
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