forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
Use offset in tvb, not 0 for computation. Also add check for checksum = 0, which means checksum isn't present. Bug: 13586 Change-Id: I18812894104c35e50ecb99aa8eca6b030c78c486 Reviewed-on: https://code.wireshark.org/review/21070 Petri-Dish: Michael Mann <mmann78@netscape.net> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Michael Mann <mmann78@netscape.net>
2060 lines
60 KiB
C
2060 lines
60 KiB
C
/* packet-icmp.c
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* Routines for ICMP - Internet Control Message Protocol
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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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* Monday, June 27, 2005
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* Support for the ICMP extensions for MPLS
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* (http://www.ietf.org/proceedings/01aug/I-D/draft-ietf-mpls-icmp-02.txt
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* which has been replaced by rfcs 4884 and 4950)
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* by Maria-Luiza Crivat <luizacri@gmail.com>
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* & Brice Augustin <bricecotte@gmail.com>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Added support for ICMP extensions RFC 4884 and RFC 5837
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* (c) 2011 Gaurav Tungatkar <gstungat@ncsu.edu>
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/expert.h>
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#include <epan/in_cksum.h>
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#include <epan/to_str.h>
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#include <epan/conversation.h>
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#include <epan/tap.h>
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#include <epan/ipproto.h>
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#include <epan/capture_dissectors.h>
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#include <epan/proto_data.h>
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#include "packet-ip.h"
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#include "packet-icmp.h"
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void proto_register_icmp(void);
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void proto_reg_handoff_icmp(void);
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static int icmp_tap = -1;
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/* Conversation related data */
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static int hf_icmp_resp_in = -1;
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static int hf_icmp_resp_to = -1;
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static int hf_icmp_no_resp = -1;
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static int hf_icmp_resptime = -1;
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static int hf_icmp_data_time = -1;
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static int hf_icmp_data_time_relative = -1;
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typedef struct _icmp_conv_info_t {
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wmem_tree_t *unmatched_pdus;
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wmem_tree_t *matched_pdus;
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} icmp_conv_info_t;
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static icmp_transaction_t *transaction_start(packet_info * pinfo,
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proto_tree * tree,
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guint32 * key);
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static icmp_transaction_t *transaction_end(packet_info * pinfo,
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proto_tree * tree,
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guint32 * key);
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/* Decode the end of the ICMP payload as ICMP MPLS extensions
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if the packet in the payload has more than 128 bytes */
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static gboolean favor_icmp_mpls_ext = FALSE;
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int proto_icmp = -1;
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static int hf_icmp_type = -1;
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static int hf_icmp_code = -1;
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static int hf_icmp_checksum = -1;
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static int hf_icmp_checksum_status = -1;
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static int hf_icmp_unused = -1;
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static int hf_icmp_reserved = -1;
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static int hf_icmp_ident = -1;
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static int hf_icmp_ident_le = -1;
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static int hf_icmp_seq_num = -1;
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static int hf_icmp_seq_num_le = -1;
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static int hf_icmp_mtu = -1;
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static int hf_icmp_num_addrs = -1;
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static int hf_icmp_addr_entry_size = -1;
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static int hf_icmp_lifetime = -1;
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static int hf_icmp_pointer = -1;
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static int hf_icmp_router_address = -1;
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static int hf_icmp_pref_level = -1;
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static int hf_icmp_redir_gw = -1;
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static int hf_icmp_originate_timestamp = -1;
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static int hf_icmp_receive_timestamp = -1;
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static int hf_icmp_transmit_timestamp = -1;
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static int hf_icmp_address_mask = -1;
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static int hf_icmp_length = -1;
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static int hf_icmp_length_original_datagram = -1;
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/* Mobile ip */
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static int hf_icmp_mip_type = -1;
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static int hf_icmp_mip_length = -1;
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static int hf_icmp_mip_prefix_length = -1;
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static int hf_icmp_mip_seq = -1;
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static int hf_icmp_mip_life = -1;
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static int hf_icmp_mip_flags = -1;
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static int hf_icmp_mip_r = -1;
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static int hf_icmp_mip_b = -1;
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static int hf_icmp_mip_h = -1;
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static int hf_icmp_mip_f = -1;
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static int hf_icmp_mip_m = -1;
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static int hf_icmp_mip_g = -1;
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static int hf_icmp_mip_v = -1;
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static int hf_icmp_mip_rt = -1;
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static int hf_icmp_mip_u = -1;
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static int hf_icmp_mip_x = -1;
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static int hf_icmp_mip_reserved = -1;
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static int hf_icmp_mip_coa = -1;
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static int hf_icmp_mip_challenge = -1;
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static int hf_icmp_mip_content = -1;
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/* extensions RFC 4884*/
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static int hf_icmp_ext = -1;
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static int hf_icmp_ext_version = -1;
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static int hf_icmp_ext_reserved = -1;
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static int hf_icmp_ext_checksum = -1;
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static int hf_icmp_ext_checksum_status = -1;
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static int hf_icmp_ext_length = -1;
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static int hf_icmp_ext_class = -1;
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static int hf_icmp_ext_c_type = -1;
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static int hf_icmp_ext_data = -1;
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/* Interface information extension RFC 5837 */
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static int hf_icmp_int_info_ifindex = -1;
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static int hf_icmp_int_info_ipaddr = -1;
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static int hf_icmp_int_info_name = -1;
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static int hf_icmp_int_info_mtu = -1;
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static int hf_icmp_int_info_index = -1;
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static int hf_icmp_int_info_afi = -1;
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static int hf_icmp_int_info_ipv4 = -1;
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static int hf_icmp_int_info_ipv6 = -1;
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static int hf_icmp_int_info_ipunknown = -1;
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static int hf_icmp_int_info_name_length = -1;
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static int hf_icmp_int_info_name_string = -1;
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static int hf_icmp_int_info_role = -1;
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static int hf_icmp_int_info_reserved = -1;
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static gint ett_icmp_interface_info_object = -1;
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static gint ett_icmp_interface_ipaddr = -1;
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static gint ett_icmp_interface_name = -1;
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/* MPLS extension object*/
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static int hf_icmp_mpls_label = -1;
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static int hf_icmp_mpls_exp = -1;
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static int hf_icmp_mpls_s = -1;
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static int hf_icmp_mpls_ttl = -1;
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static int hf_icmp_mpls_data = -1;
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static gint ett_icmp = -1;
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static gint ett_icmp_mip = -1;
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static gint ett_icmp_mip_flags = -1;
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/* extensions */
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static gint ett_icmp_ext = -1;
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static gint ett_icmp_ext_object = -1;
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/* MPLS extensions */
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static gint ett_icmp_mpls_stack_object = -1;
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static expert_field ei_icmp_resp_not_found = EI_INIT;
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static expert_field ei_icmp_checksum = EI_INIT;
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static expert_field ei_icmp_ext_checksum = EI_INIT;
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static dissector_handle_t icmp_handle;
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/* ICMP definitions */
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#define ICMP_ECHOREPLY 0
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#define ICMP_UNREACH 3
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#define ICMP_SOURCEQUENCH 4
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#define ICMP_REDIRECT 5
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#define ICMP_ALTHOST 6
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#define ICMP_ECHO 8
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#define ICMP_RTRADVERT 9
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#define ICMP_RTRSOLICIT 10
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#define ICMP_TIMXCEED 11
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#define ICMP_PARAMPROB 12
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#define ICMP_TSTAMP 13
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#define ICMP_TSTAMPREPLY 14
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#define ICMP_IREQ 15
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#define ICMP_IREQREPLY 16
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#define ICMP_MASKREQ 17
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#define ICMP_MASKREPLY 18
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#define ICMP_PHOTURIS 40
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/* ICMP UNREACHABLE */
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#define ICMP_NET_UNREACH 0 /* Network Unreachable */
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#define ICMP_HOST_UNREACH 1 /* Host Unreachable */
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#define ICMP_PROT_UNREACH 2 /* Protocol Unreachable */
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#define ICMP_PORT_UNREACH 3 /* Port Unreachable */
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#define ICMP_FRAG_NEEDED 4 /* Fragmentation Needed/DF set */
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#define ICMP_SR_FAILED 5 /* Source Route failed */
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#define ICMP_NET_UNKNOWN 6
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#define ICMP_HOST_UNKNOWN 7
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#define ICMP_HOST_ISOLATED 8
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#define ICMP_NET_ANO 9
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#define ICMP_HOST_ANO 10
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#define ICMP_NET_UNR_TOS 11
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#define ICMP_HOST_UNR_TOS 12
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#define ICMP_PKT_FILTERED 13 /* Packet filtered */
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#define ICMP_PREC_VIOLATION 14 /* Precedence violation */
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#define ICMP_PREC_CUTOFF 15 /* Precedence cut off */
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#define ICMP_MIP_EXTENSION_PAD 0
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#define ICMP_MIP_MOB_AGENT_ADV 16
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#define ICMP_MIP_PREFIX_LENGTHS 19
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#define ICMP_MIP_CHALLENGE 24
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static dissector_handle_t ip_handle;
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static const value_string icmp_type_str[] = {
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{ICMP_ECHOREPLY, "Echo (ping) reply"},
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{1, "Reserved"},
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{2, "Reserved"},
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{ICMP_UNREACH, "Destination unreachable"},
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{ICMP_SOURCEQUENCH, "Source quench (flow control)"},
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{ICMP_REDIRECT, "Redirect"},
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{ICMP_ALTHOST, "Alternate host address"},
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{ICMP_ECHO, "Echo (ping) request"},
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{ICMP_RTRADVERT, "Router advertisement"},
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{ICMP_RTRSOLICIT, "Router solicitation"},
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{ICMP_TIMXCEED, "Time-to-live exceeded"},
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{ICMP_PARAMPROB, "Parameter problem"},
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{ICMP_TSTAMP, "Timestamp request"},
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{ICMP_TSTAMPREPLY, "Timestamp reply"},
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{ICMP_IREQ, "Information request"},
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{ICMP_IREQREPLY, "Information reply"},
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{ICMP_MASKREQ, "Address mask request"},
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{ICMP_MASKREPLY, "Address mask reply"},
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{19, "Reserved (for security)"},
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{30, "Traceroute"},
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{31, "Datagram Conversion Error"},
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{32, "Mobile Host Redirect"},
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{33, "IPv6 Where-Are-You"},
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{34, "IPv6 I-Am-Here"},
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{35, "Mobile Registration Request"},
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{36, "Mobile Registration Reply"},
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{37, "Domain Name Request"},
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{38, "Domain Name Reply"},
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{39, "SKIP"},
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{ICMP_PHOTURIS, "Photuris"},
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{41, "Experimental mobility protocols"},
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{0, NULL}
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};
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static const value_string unreach_code_str[] = {
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{ICMP_NET_UNREACH, "Network unreachable"},
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{ICMP_HOST_UNREACH, "Host unreachable"},
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{ICMP_PROT_UNREACH, "Protocol unreachable"},
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{ICMP_PORT_UNREACH, "Port unreachable"},
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{ICMP_FRAG_NEEDED, "Fragmentation needed"},
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{ICMP_SR_FAILED, "Source route failed"},
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{ICMP_NET_UNKNOWN, "Destination network unknown"},
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{ICMP_HOST_UNKNOWN, "Destination host unknown"},
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{ICMP_HOST_ISOLATED, "Source host isolated"},
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{ICMP_NET_ANO, "Network administratively prohibited"},
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{ICMP_HOST_ANO, "Host administratively prohibited"},
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{ICMP_NET_UNR_TOS, "Network unreachable for TOS"},
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{ICMP_HOST_UNR_TOS, "Host unreachable for TOS"},
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{ICMP_PKT_FILTERED, "Communication administratively filtered"},
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{ICMP_PREC_VIOLATION, "Host precedence violation"},
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{ICMP_PREC_CUTOFF, "Precedence cutoff in effect"},
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{0, NULL}
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};
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static const value_string redir_code_str[] = {
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{0, "Redirect for network"},
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{1, "Redirect for host"},
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{2, "Redirect for TOS and network"},
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{3, "Redirect for TOS and host"},
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{0, NULL}
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};
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static const value_string alt_host_code_str[] = {
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{0, "Alternate address for host"},
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{0, NULL}
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};
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static const value_string rtradvert_code_str[] = {
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{ 0, "Normal router advertisement"},
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{16, "Does not route common traffic"},
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{0, NULL}
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};
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static const value_string ttl_code_str[] = {
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{0, "Time to live exceeded in transit"},
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{1, "Fragment reassembly time exceeded"},
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{0, NULL}
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};
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static const value_string par_code_str[] = {
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{0, "Pointer indicates the error"},
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{1, "Required option missing"},
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{2, "Bad length"},
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{0, NULL}
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};
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static const value_string photuris_code_str[] = {
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{0, "Bad SPI"},
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{1, "Authentication Failed"},
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{2, "Decompression Failed"},
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{3, "Decryption Failed"},
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{4, "Need Authentication"},
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{5, "Need Authorization"},
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{0, NULL}
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};
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static const value_string mip_extensions[] = {
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{ICMP_MIP_EXTENSION_PAD, "One byte padding extension"}, /* RFC 2002 */
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{ICMP_MIP_MOB_AGENT_ADV, "Mobility Agent Advertisement Extension"},
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/* RFC 2002 */
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{ICMP_MIP_PREFIX_LENGTHS, "Prefix Lengths Extension"}, /* RFC 2002 */
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{ICMP_MIP_CHALLENGE, "Challenge Extension"}, /* RFC 3012 */
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{0, NULL}
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};
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/* RFC 5837 ICMP extension - Interface Information Object
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* Interface Role
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*/
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static const value_string interface_role_str[] = {
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{0, "IP interface upon which datagram arrived"},
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{1, "sub-IP component of an IP interface upon which datagram arrived"},
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{2, "IP interface through which datagram would be forwarded"},
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{3, "IP next-hop to which datagram would be forwarded"},
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{0, NULL}
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};
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#define INT_INFO_INTERFACE_ROLE 0xc0
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#define INT_INFO_RESERVED 0x30
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#define INT_INFO_IFINDEX 0x08
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#define INT_INFO_IPADDR 0x04
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#define INT_INFO_NAME 0x02
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#define INT_INFO_MTU 0x01
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#define INTERFACE_INFORMATION_OBJECT_CLASS 2
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#define MPLS_STACK_ENTRY_OBJECT_CLASS 1
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#define MPLS_EXTENDED_PAYLOAD_OBJECT_CLASS 0
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#define MPLS_STACK_ENTRY_C_TYPE 1
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#define MPLS_EXTENDED_PAYLOAD_C_TYPE 1
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/* Return true if the address is in the 224.0.0.0/4 network block */
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#define is_a_multicast_addr(a) \
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((g_ntohl(a) & 0xf0000000) == 0xe0000000)
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/* Return true if the address is the 255.255.255.255 broadcast address */
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#define is_a_broadcast_addr(a) \
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(g_ntohl(a) == 0xffffffff)
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#define ADDR_IS_MULTICAST(addr) \
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(((addr)->len == 4) && is_a_multicast_addr(*(const guint32 *)((addr)->data)))
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#define ADDR_IS_BROADCAST(addr) \
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(((addr)->len == 4) && is_a_broadcast_addr(*(const guint32 *)((addr)->data)))
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#define ADDR_IS_NOT_UNICAST(addr) \
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(ADDR_IS_MULTICAST(addr) || ADDR_IS_BROADCAST(addr))
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static conversation_t *_find_or_create_conversation(packet_info * pinfo)
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{
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conversation_t *conv = NULL;
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/* Have we seen this conversation before? */
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conv =
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find_conversation(pinfo->num, &pinfo->src, &pinfo->dst,
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pinfo->ptype, 0, 0, 0);
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if (conv == NULL) {
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/* No, this is a new conversation. */
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conv =
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conversation_new(pinfo->num, &pinfo->src,
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&pinfo->dst, pinfo->ptype, 0, 0, 0);
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}
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return conv;
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}
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/*
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* Dissect the mobile ip advertisement extensions.
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*/
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static void
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dissect_mip_extensions(tvbuff_t * tvb, int offset, proto_tree * tree)
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{
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guint8 type;
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guint8 length;
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proto_item *ti;
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proto_tree *mip_tree = NULL;
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gint numCOAs;
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gint i;
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static const int * flags[] = {
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&hf_icmp_mip_r,
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&hf_icmp_mip_b,
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&hf_icmp_mip_h,
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&hf_icmp_mip_f,
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&hf_icmp_mip_m,
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&hf_icmp_mip_g,
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&hf_icmp_mip_v,
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&hf_icmp_mip_rt,
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&hf_icmp_mip_u,
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&hf_icmp_mip_x,
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&hf_icmp_mip_reserved,
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NULL
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};
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/* Not much to do if we're not parsing everything */
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if (!tree)
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return;
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while (tvb_reported_length_remaining(tvb, offset) > 0) {
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type = tvb_get_guint8(tvb, offset + 0);
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if (type) {
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length = tvb_get_guint8(tvb, offset + 1);
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} else {
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length = 0;
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}
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mip_tree = proto_tree_add_subtree_format(tree, tvb, offset,
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1, ett_icmp_mip, &ti,
|
|
"Ext: %s", val_to_str(type,
|
|
mip_extensions,
|
|
"Unknown ext %u"));
|
|
proto_tree_add_item(mip_tree, hf_icmp_mip_type,
|
|
tvb, offset, 1,
|
|
ENC_BIG_ENDIAN);
|
|
offset++;
|
|
if (type != ICMP_MIP_EXTENSION_PAD)
|
|
{
|
|
proto_item_set_len(ti, length + 2);
|
|
|
|
/* length */
|
|
proto_tree_add_item(mip_tree, hf_icmp_mip_length,
|
|
tvb, offset, 1,
|
|
ENC_BIG_ENDIAN);
|
|
offset++;
|
|
}
|
|
|
|
switch (type) {
|
|
case ICMP_MIP_EXTENSION_PAD:
|
|
/* One byte padding extension */
|
|
break;
|
|
case ICMP_MIP_MOB_AGENT_ADV:
|
|
/* Mobility Agent Advertisement Extension (RFC 2002) */
|
|
/* Add our fields */
|
|
/* sequence number */
|
|
proto_tree_add_item(mip_tree, hf_icmp_mip_seq, tvb,
|
|
offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
/* Registration Lifetime */
|
|
proto_tree_add_item(mip_tree, hf_icmp_mip_life,
|
|
tvb, offset, 2,
|
|
ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
/* flags */
|
|
proto_tree_add_bitmask(mip_tree, tvb, offset, hf_icmp_mip_flags, ett_icmp_mip_flags, flags, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
/* COAs */
|
|
numCOAs = (length - 6) / 4;
|
|
for (i = 0; i < numCOAs; i++) {
|
|
proto_tree_add_item(mip_tree,
|
|
hf_icmp_mip_coa, tvb,
|
|
offset, 4,
|
|
ENC_BIG_ENDIAN);
|
|
offset += 4;
|
|
}
|
|
break;
|
|
case ICMP_MIP_PREFIX_LENGTHS:
|
|
/* Prefix-Lengths Extension (RFC 2002) */
|
|
/* Add our fields */
|
|
|
|
/* prefix lengths */
|
|
for (i = 0; i < length; i++) {
|
|
proto_tree_add_item(mip_tree,
|
|
hf_icmp_mip_prefix_length,
|
|
tvb, offset, 1,
|
|
ENC_BIG_ENDIAN);
|
|
offset++;
|
|
}
|
|
break;
|
|
case ICMP_MIP_CHALLENGE:
|
|
/* Challenge Extension (RFC 3012) */
|
|
/* challenge */
|
|
proto_tree_add_item(mip_tree,
|
|
hf_icmp_mip_challenge, tvb,
|
|
offset, length, ENC_NA);
|
|
offset += length;
|
|
|
|
break;
|
|
default:
|
|
/* data, if any */
|
|
if (length != 0) {
|
|
proto_tree_add_item(mip_tree, hf_icmp_mip_content, tvb, offset, length - 4, ENC_NA);
|
|
offset += length;
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
} /* dissect_mip_extensions */
|
|
|
|
static gboolean
|
|
dissect_mpls_extended_payload_object(tvbuff_t * tvb, gint offset,
|
|
proto_tree * ext_object_tree,
|
|
proto_item * tf_object)
|
|
{
|
|
|
|
guint16 obj_length, obj_trunc_length;
|
|
gboolean unknown_object;
|
|
guint8 c_type;
|
|
unknown_object = FALSE;
|
|
/* Object length */
|
|
obj_length = tvb_get_ntohs(tvb, offset);
|
|
|
|
obj_trunc_length =
|
|
MIN(obj_length, tvb_reported_length_remaining(tvb, offset));
|
|
|
|
/* C-Type */
|
|
c_type = tvb_get_guint8(tvb, offset + 3);
|
|
proto_tree_add_uint(ext_object_tree, hf_icmp_ext_c_type, tvb,
|
|
offset + 3, 1, c_type);
|
|
|
|
/* skip the object header */
|
|
offset += 4;
|
|
|
|
switch (c_type) {
|
|
case MPLS_EXTENDED_PAYLOAD_C_TYPE:
|
|
proto_item_set_text(tf_object, "Extended Payload");
|
|
|
|
/* This object contains some portion of the original packet
|
|
that could not fit in the 128 bytes of the ICMP payload */
|
|
if (obj_trunc_length > 4) {
|
|
proto_tree_add_item(ext_object_tree, hf_icmp_ext_data, tvb, offset, obj_trunc_length - 4, ENC_NA);
|
|
}
|
|
break;
|
|
default:
|
|
unknown_object = TRUE;
|
|
} /* end switch c_type */
|
|
return unknown_object;
|
|
}
|
|
|
|
static gboolean
|
|
dissect_mpls_stack_entry_object(tvbuff_t * tvb, gint offset,
|
|
proto_tree * ext_object_tree,
|
|
proto_item * tf_object)
|
|
{
|
|
|
|
proto_item *tf_entry;
|
|
proto_tree *mpls_stack_object_tree;
|
|
guint16 obj_length, obj_trunc_length;
|
|
gint obj_end_offset;
|
|
guint label;
|
|
guint8 ttl;
|
|
guint8 tmp;
|
|
gboolean unknown_object;
|
|
guint8 c_type;
|
|
unknown_object = FALSE;
|
|
/* Object length */
|
|
obj_length = tvb_get_ntohs(tvb, offset);
|
|
|
|
obj_trunc_length =
|
|
MIN(obj_length, tvb_reported_length_remaining(tvb, offset));
|
|
obj_end_offset = offset + obj_trunc_length;
|
|
/* C-Type */
|
|
c_type = tvb_get_guint8(tvb, offset + 3);
|
|
proto_tree_add_uint(ext_object_tree, hf_icmp_ext_c_type, tvb,
|
|
offset + 3, 1, c_type);
|
|
|
|
/* skip the object header */
|
|
offset += 4;
|
|
|
|
switch (c_type) {
|
|
case MPLS_STACK_ENTRY_C_TYPE:
|
|
proto_item_set_text(tf_object, "MPLS Stack Entry");
|
|
/* For each entry */
|
|
while (offset + 4 <= obj_end_offset) {
|
|
if (tvb_reported_length_remaining(tvb, offset) < 4) {
|
|
/* Not enough room in the packet ! */
|
|
break;
|
|
}
|
|
/* Create a subtree for each entry (the text will be set later) */
|
|
mpls_stack_object_tree = proto_tree_add_subtree(ext_object_tree,
|
|
tvb, offset, 4,
|
|
ett_icmp_mpls_stack_object, &tf_entry, " ");
|
|
|
|
/* Label */
|
|
label = (guint) tvb_get_ntohs(tvb, offset);
|
|
tmp = tvb_get_guint8(tvb, offset + 2);
|
|
label = (label << 4) + (tmp >> 4);
|
|
|
|
proto_tree_add_uint(mpls_stack_object_tree,
|
|
hf_icmp_mpls_label, tvb,
|
|
offset, 3, label << 4);
|
|
|
|
proto_item_set_text(tf_entry, "Label: %u", label);
|
|
|
|
/* Experimental field (also called "CoS") */
|
|
proto_tree_add_uint(mpls_stack_object_tree,
|
|
hf_icmp_mpls_exp, tvb,
|
|
offset + 2, 1, tmp);
|
|
|
|
proto_item_append_text(tf_entry, ", Exp: %u",
|
|
(tmp >> 1) & 0x07);
|
|
|
|
/* Stack bit */
|
|
proto_tree_add_boolean(mpls_stack_object_tree,
|
|
hf_icmp_mpls_s, tvb,
|
|
offset + 2, 1, tmp);
|
|
|
|
proto_item_append_text(tf_entry, ", S: %u",
|
|
tmp & 0x01);
|
|
|
|
/* TTL */
|
|
ttl = tvb_get_guint8(tvb, offset + 3);
|
|
|
|
proto_tree_add_item(mpls_stack_object_tree,
|
|
hf_icmp_mpls_ttl, tvb,
|
|
offset + 3, 1, ENC_BIG_ENDIAN);
|
|
|
|
proto_item_append_text(tf_entry, ", TTL: %u", ttl);
|
|
|
|
/* Skip the entry */
|
|
offset += 4;
|
|
}
|
|
|
|
if (offset < obj_end_offset) {
|
|
proto_tree_add_item(ext_object_tree, hf_icmp_mpls_data, tvb, offset, obj_end_offset - offset, ENC_NA);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
|
|
unknown_object = TRUE;
|
|
|
|
break;
|
|
} /* end switch c_type */
|
|
return unknown_object;
|
|
|
|
} /* end dissect_mpls_stack_entry_object */
|
|
|
|
/* Dissect Interface Information Object RFC 5837*/
|
|
static gboolean
|
|
dissect_interface_information_object(tvbuff_t * tvb, gint offset,
|
|
proto_tree * ext_object_tree,
|
|
proto_item * tf_object)
|
|
{
|
|
proto_tree *int_name_object_tree = NULL;
|
|
proto_tree *int_ipaddr_object_tree;
|
|
guint16 obj_length, obj_trunc_length;
|
|
gint obj_end_offset;
|
|
guint8 c_type;
|
|
gboolean unknown_object;
|
|
guint8 if_index_flag;
|
|
guint8 ipaddr_flag;
|
|
guint8 name_flag;
|
|
guint16 afi;
|
|
guint8 int_name_length = 0;
|
|
|
|
unknown_object = FALSE;
|
|
/* Object length */
|
|
obj_length = tvb_get_ntohs(tvb, offset);
|
|
|
|
obj_trunc_length =
|
|
MIN(obj_length, tvb_reported_length_remaining(tvb, offset));
|
|
obj_end_offset = offset + obj_trunc_length;
|
|
|
|
/* C-Type */
|
|
c_type = tvb_get_guint8(tvb, offset + 3);
|
|
|
|
proto_item_set_text(tf_object, "Interface Information Object");
|
|
if (tvb_reported_length_remaining(tvb, offset) < 4) {
|
|
/* Not enough room in the packet ! return unknown_object = TRUE */
|
|
return TRUE;
|
|
}
|
|
|
|
if_index_flag = (c_type & INT_INFO_IFINDEX) >> 3;
|
|
ipaddr_flag = (c_type & INT_INFO_IPADDR) >> 2;
|
|
name_flag = (c_type & INT_INFO_NAME) >> 1;
|
|
|
|
{
|
|
static const gint *c_type_fields[] = {
|
|
&hf_icmp_int_info_role,
|
|
&hf_icmp_int_info_reserved,
|
|
&hf_icmp_int_info_ifindex,
|
|
&hf_icmp_int_info_ipaddr,
|
|
&hf_icmp_int_info_name,
|
|
&hf_icmp_int_info_mtu,
|
|
NULL
|
|
};
|
|
proto_tree_add_bitmask(ext_object_tree, tvb, offset + 3,
|
|
hf_icmp_ext_c_type,
|
|
ett_icmp_interface_info_object,
|
|
c_type_fields, ENC_BIG_ENDIAN);
|
|
}
|
|
|
|
/* skip header */
|
|
offset += 4;
|
|
|
|
/*if ifIndex is set, next 32 bits are ifIndex */
|
|
if (if_index_flag) {
|
|
|
|
proto_tree_add_item(ext_object_tree, hf_icmp_int_info_index, tvb, offset, 4, ENC_NA);
|
|
offset += 4;
|
|
}
|
|
|
|
/* IP Address Sub Object */
|
|
if (ipaddr_flag && (obj_end_offset >= offset + 2)) {
|
|
/* Address Family Identifier */
|
|
afi = tvb_get_ntohs(tvb, offset);
|
|
|
|
/*
|
|
* if afi = 1, IPv4 address, 2 bytes afi, 2 bytes rsvd, 4 bytes IP addr
|
|
* if afi = 2, IPv6 address, 2 bytes afi, 2 bytes rsvd, 16 bytes IP addr
|
|
*/
|
|
int_ipaddr_object_tree = proto_tree_add_subtree(ext_object_tree, tvb, offset,
|
|
afi == 1 ? 8 : 10, ett_icmp_interface_ipaddr, NULL,
|
|
"IP Address Sub-Object");
|
|
|
|
proto_tree_add_uint(int_ipaddr_object_tree,
|
|
hf_icmp_int_info_afi, tvb, offset, 2,
|
|
afi);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(int_ipaddr_object_tree, hf_icmp_reserved, tvb, offset, 2, ENC_NA);
|
|
offset += 2;
|
|
|
|
switch(afi){
|
|
case 1: /* IPv4 */
|
|
proto_tree_add_item(int_ipaddr_object_tree, hf_icmp_int_info_ipv4, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
break;
|
|
case 2: /* IPv6 */
|
|
proto_tree_add_item(int_ipaddr_object_tree, hf_icmp_int_info_ipv6, tvb, offset, 16, ENC_NA);
|
|
break;
|
|
default: /* Unknown ?! */
|
|
proto_tree_add_item(int_ipaddr_object_tree, hf_icmp_int_info_ipunknown, tvb, offset, offset - obj_end_offset, ENC_NA);
|
|
return FALSE;
|
|
}
|
|
|
|
}
|
|
|
|
/* Interface Name Sub Object */
|
|
if (name_flag) {
|
|
if (obj_end_offset >= offset + 1) {
|
|
int_name_length = tvb_get_guint8(tvb, offset);
|
|
int_name_object_tree = proto_tree_add_subtree(ext_object_tree, tvb,
|
|
offset, int_name_length, ett_icmp_interface_name, NULL,
|
|
"Interface Name Sub-Object");
|
|
|
|
proto_tree_add_item(int_name_object_tree, hf_icmp_int_info_name_length, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
}
|
|
if (obj_end_offset >= offset + 1 + int_name_length) {
|
|
proto_tree_add_item(int_name_object_tree, hf_icmp_int_info_name_string, tvb, offset + 1, int_name_length, ENC_ASCII|ENC_NA);
|
|
}
|
|
}
|
|
|
|
|
|
return unknown_object;
|
|
|
|
} /*end dissect_interface_information_object */
|
|
|
|
static void
|
|
dissect_extensions(tvbuff_t * tvb, packet_info *pinfo, gint offset, proto_tree * tree)
|
|
{
|
|
guint8 version;
|
|
guint8 class_num;
|
|
guint8 c_type;
|
|
guint16 obj_length, obj_trunc_length, checksum;
|
|
proto_item *ti, *tf_object;
|
|
proto_tree *ext_tree, *ext_object_tree;
|
|
gint obj_end_offset;
|
|
guint reported_length;
|
|
gboolean unknown_object;
|
|
guint8 int_info_obj_count;
|
|
|
|
int_info_obj_count = 0;
|
|
|
|
reported_length = tvb_reported_length_remaining(tvb, offset);
|
|
|
|
/* Add a tree for multi-part extensions RFC 4884 */
|
|
ti = proto_tree_add_none_format(tree, hf_icmp_ext, tvb,
|
|
offset, reported_length,
|
|
"ICMP Multi-Part Extensions");
|
|
|
|
if (reported_length < 4 /* Common header */ ) {
|
|
return;
|
|
}
|
|
|
|
ext_tree = proto_item_add_subtree(ti, ett_icmp_ext);
|
|
|
|
/* Version */
|
|
version = hi_nibble(tvb_get_guint8(tvb, offset));
|
|
proto_tree_add_uint(ext_tree, hf_icmp_ext_version, tvb, offset, 1,
|
|
version);
|
|
|
|
/* Reserved */
|
|
proto_tree_add_item(ext_tree, hf_icmp_ext_reserved,
|
|
tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
/* Checksum */
|
|
checksum = tvb_get_ntohs(tvb, offset + 2);
|
|
if (checksum == 0) {
|
|
proto_tree_add_checksum(ext_tree, tvb, offset + 2, hf_icmp_ext_checksum, hf_icmp_ext_checksum_status, &ei_icmp_ext_checksum,
|
|
pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NOT_PRESENT);
|
|
|
|
} else {
|
|
proto_tree_add_checksum(ext_tree, tvb, offset + 2, hf_icmp_ext_checksum, hf_icmp_ext_checksum_status, &ei_icmp_ext_checksum,
|
|
pinfo, ip_checksum_tvb(tvb, offset, reported_length), ENC_BIG_ENDIAN, PROTO_CHECKSUM_VERIFY|PROTO_CHECKSUM_IN_CKSUM);
|
|
}
|
|
|
|
if (version != 1 && version != 2) {
|
|
/* Unsupported version */
|
|
proto_item_append_text(ti, " (unsupported version)");
|
|
return;
|
|
}
|
|
|
|
/* Skip the common header */
|
|
offset += 4;
|
|
|
|
/* While there is enough room to read an object */
|
|
while (tvb_reported_length_remaining(tvb, offset) >=
|
|
4 /* Object header */ ) {
|
|
/* Object length */
|
|
obj_length = tvb_get_ntohs(tvb, offset);
|
|
|
|
obj_trunc_length =
|
|
MIN(obj_length,
|
|
tvb_reported_length_remaining(tvb, offset));
|
|
|
|
obj_end_offset = offset + obj_trunc_length;
|
|
|
|
/* Add a subtree for this object (the text will be reset later) */
|
|
ext_object_tree = proto_tree_add_subtree(ext_tree, tvb, offset,
|
|
MAX(obj_trunc_length, 4),
|
|
ett_icmp_ext_object, &tf_object, "Unknown object");
|
|
|
|
proto_tree_add_uint(ext_object_tree, hf_icmp_ext_length,
|
|
tvb, offset, 2, obj_length);
|
|
|
|
/* Class */
|
|
class_num = tvb_get_guint8(tvb, offset + 2);
|
|
proto_tree_add_uint(ext_object_tree, hf_icmp_ext_class,
|
|
tvb, offset + 2, 1, class_num);
|
|
|
|
/* C-Type */
|
|
c_type = tvb_get_guint8(tvb, offset + 3);
|
|
|
|
if (obj_length < 4 /* Object header */ ) {
|
|
/* Thanks doc/README.developer :)) */
|
|
proto_item_set_text(tf_object,
|
|
"Object with bad length");
|
|
break;
|
|
}
|
|
|
|
|
|
switch (class_num) {
|
|
case MPLS_STACK_ENTRY_OBJECT_CLASS:
|
|
unknown_object =
|
|
dissect_mpls_stack_entry_object(tvb, offset,
|
|
ext_object_tree,
|
|
tf_object);
|
|
break;
|
|
case INTERFACE_INFORMATION_OBJECT_CLASS:
|
|
unknown_object =
|
|
dissect_interface_information_object(tvb,
|
|
offset,
|
|
ext_object_tree,
|
|
tf_object);
|
|
int_info_obj_count++;
|
|
if (int_info_obj_count > 4) {
|
|
proto_item_set_text(tf_object,
|
|
"More than 4 Interface Information Objects");
|
|
}
|
|
break;
|
|
case MPLS_EXTENDED_PAYLOAD_OBJECT_CLASS:
|
|
unknown_object =
|
|
dissect_mpls_extended_payload_object(tvb,
|
|
offset,
|
|
ext_object_tree,
|
|
tf_object);
|
|
break;
|
|
default:
|
|
|
|
unknown_object = TRUE;
|
|
|
|
break;
|
|
} /* end switch class_num */
|
|
|
|
/* The switches couldn't decode the object */
|
|
if (unknown_object == TRUE) {
|
|
proto_tree_add_item(ext_object_tree, hf_icmp_ext_c_type, tvb, offset + 3, 1, ENC_BIG_ENDIAN);
|
|
|
|
/* Skip the object header */
|
|
offset += 4;
|
|
|
|
proto_item_set_text(tf_object,
|
|
"Unknown object (%d/%d)",
|
|
class_num, c_type);
|
|
|
|
if (obj_trunc_length > 4) {
|
|
proto_tree_add_item(ext_object_tree, hf_icmp_ext_data, tvb, offset, obj_trunc_length - 4, ENC_NA);
|
|
}
|
|
}
|
|
|
|
/* */
|
|
if (obj_trunc_length < obj_length) {
|
|
proto_item_append_text(tf_object, " (truncated)");
|
|
}
|
|
|
|
/* Go to the end of the object */
|
|
offset = obj_end_offset;
|
|
|
|
}
|
|
}
|
|
|
|
/* ======================================================================= */
|
|
static icmp_transaction_t *transaction_start(packet_info * pinfo,
|
|
proto_tree * tree,
|
|
guint32 * key)
|
|
{
|
|
conversation_t *conversation;
|
|
icmp_conv_info_t *icmp_info;
|
|
icmp_transaction_t *icmp_trans;
|
|
wmem_tree_key_t icmp_key[3];
|
|
proto_item *it;
|
|
|
|
/* Handle the conversation tracking */
|
|
conversation = _find_or_create_conversation(pinfo);
|
|
icmp_info = (icmp_conv_info_t *)conversation_get_proto_data(conversation, proto_icmp);
|
|
if (icmp_info == NULL) {
|
|
icmp_info = wmem_new(wmem_file_scope(), icmp_conv_info_t);
|
|
icmp_info->unmatched_pdus = wmem_tree_new(wmem_file_scope());
|
|
icmp_info->matched_pdus = wmem_tree_new(wmem_file_scope());
|
|
conversation_add_proto_data(conversation, proto_icmp,
|
|
icmp_info);
|
|
}
|
|
|
|
if (!PINFO_FD_VISITED(pinfo)) {
|
|
/* this is a new request, create a new transaction structure and map it to the
|
|
unmatched table
|
|
*/
|
|
icmp_key[0].length = 2;
|
|
icmp_key[0].key = key;
|
|
icmp_key[1].length = 0;
|
|
icmp_key[1].key = NULL;
|
|
|
|
icmp_trans = wmem_new(wmem_file_scope(), icmp_transaction_t);
|
|
icmp_trans->rqst_frame = pinfo->num;
|
|
icmp_trans->resp_frame = 0;
|
|
icmp_trans->rqst_time = pinfo->abs_ts;
|
|
nstime_set_zero(&icmp_trans->resp_time);
|
|
wmem_tree_insert32_array(icmp_info->unmatched_pdus, icmp_key,
|
|
(void *) icmp_trans);
|
|
} else {
|
|
/* Already visited this frame */
|
|
guint32 frame_num = pinfo->num;
|
|
|
|
icmp_key[0].length = 2;
|
|
icmp_key[0].key = key;
|
|
icmp_key[1].length = 1;
|
|
icmp_key[1].key = &frame_num;
|
|
icmp_key[2].length = 0;
|
|
icmp_key[2].key = NULL;
|
|
|
|
icmp_trans =
|
|
(icmp_transaction_t *)wmem_tree_lookup32_array(icmp_info->matched_pdus,
|
|
icmp_key);
|
|
}
|
|
if (icmp_trans == NULL) {
|
|
if (ADDR_IS_NOT_UNICAST(&pinfo->dst)) {
|
|
/* Note the non-unicast destination and skip transaction tracking */
|
|
col_append_str(pinfo->cinfo, COL_INFO, ADDR_IS_BROADCAST(&pinfo->dst) ? " (broadcast)" : " (multicast)");
|
|
} else if (PINFO_FD_VISITED(pinfo)) {
|
|
/* No response found - add field and expert info */
|
|
it = proto_tree_add_item(tree, hf_icmp_no_resp, NULL, 0, 0,
|
|
ENC_NA);
|
|
PROTO_ITEM_SET_GENERATED(it);
|
|
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (no response found!)");
|
|
|
|
/* Expert info. TODO: add to _icmp_transaction_t type and sequence number
|
|
so can report here (and in taps) */
|
|
expert_add_info_format(pinfo, it, &ei_icmp_resp_not_found,
|
|
"No response seen to ICMP request");
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Print state tracking in the tree */
|
|
if (icmp_trans->resp_frame) {
|
|
it = proto_tree_add_uint(tree, hf_icmp_resp_in, NULL, 0, 0,
|
|
icmp_trans->resp_frame);
|
|
PROTO_ITEM_SET_GENERATED(it);
|
|
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (reply in %d)",
|
|
icmp_trans->resp_frame);
|
|
}
|
|
|
|
return icmp_trans;
|
|
|
|
} /* transaction_start() */
|
|
|
|
/* ======================================================================= */
|
|
static icmp_transaction_t *transaction_end(packet_info * pinfo,
|
|
proto_tree * tree,
|
|
guint32 * key)
|
|
{
|
|
conversation_t *conversation;
|
|
icmp_conv_info_t *icmp_info;
|
|
icmp_transaction_t *icmp_trans;
|
|
wmem_tree_key_t icmp_key[3];
|
|
proto_item *it;
|
|
nstime_t ns;
|
|
double resp_time;
|
|
|
|
conversation =
|
|
find_conversation(pinfo->num, &pinfo->src, &pinfo->dst,
|
|
pinfo->ptype, 0, 0, 0);
|
|
if (conversation == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
icmp_info = (icmp_conv_info_t *)conversation_get_proto_data(conversation, proto_icmp);
|
|
if (icmp_info == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
if (!PINFO_FD_VISITED(pinfo)) {
|
|
guint32 frame_num;
|
|
|
|
icmp_key[0].length = 2;
|
|
icmp_key[0].key = key;
|
|
icmp_key[1].length = 0;
|
|
icmp_key[1].key = NULL;
|
|
icmp_trans =
|
|
(icmp_transaction_t *)wmem_tree_lookup32_array(icmp_info->unmatched_pdus,
|
|
icmp_key);
|
|
if (icmp_trans == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
/* we have already seen this response, or an identical one */
|
|
if (icmp_trans->resp_frame != 0) {
|
|
return NULL;
|
|
}
|
|
|
|
icmp_trans->resp_frame = pinfo->num;
|
|
|
|
/* we found a match. Add entries to the matched table for both request and reply frames
|
|
*/
|
|
icmp_key[0].length = 2;
|
|
icmp_key[0].key = key;
|
|
icmp_key[1].length = 1;
|
|
icmp_key[1].key = &frame_num;
|
|
icmp_key[2].length = 0;
|
|
icmp_key[2].key = NULL;
|
|
|
|
frame_num = icmp_trans->rqst_frame;
|
|
wmem_tree_insert32_array(icmp_info->matched_pdus, icmp_key,
|
|
(void *) icmp_trans);
|
|
|
|
frame_num = icmp_trans->resp_frame;
|
|
wmem_tree_insert32_array(icmp_info->matched_pdus, icmp_key,
|
|
(void *) icmp_trans);
|
|
} else {
|
|
/* Already visited this frame */
|
|
guint32 frame_num = pinfo->num;
|
|
|
|
icmp_key[0].length = 2;
|
|
icmp_key[0].key = key;
|
|
icmp_key[1].length = 1;
|
|
icmp_key[1].key = &frame_num;
|
|
icmp_key[2].length = 0;
|
|
icmp_key[2].key = NULL;
|
|
|
|
icmp_trans =
|
|
(icmp_transaction_t *)wmem_tree_lookup32_array(icmp_info->matched_pdus,
|
|
icmp_key);
|
|
|
|
if (icmp_trans == NULL) {
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
|
|
it = proto_tree_add_uint(tree, hf_icmp_resp_to, NULL, 0, 0,
|
|
icmp_trans->rqst_frame);
|
|
PROTO_ITEM_SET_GENERATED(it);
|
|
|
|
nstime_delta(&ns, &pinfo->abs_ts, &icmp_trans->rqst_time);
|
|
icmp_trans->resp_time = ns;
|
|
resp_time = nstime_to_msec(&ns);
|
|
it = proto_tree_add_double_format_value(tree, hf_icmp_resptime,
|
|
NULL, 0, 0, resp_time,
|
|
"%.3f ms", resp_time);
|
|
PROTO_ITEM_SET_GENERATED(it);
|
|
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (request in %d)",
|
|
icmp_trans->rqst_frame);
|
|
|
|
return icmp_trans;
|
|
|
|
} /* transaction_end() */
|
|
|
|
#define MSPERDAY 86400000
|
|
|
|
/* ======================================================================= */
|
|
static guint32
|
|
get_best_guess_mstimeofday(tvbuff_t * tvb, gint offset, guint32 comp_ts)
|
|
{
|
|
guint32 be_ts, le_ts;
|
|
|
|
/* Account for the special case from RFC 792 as best we can by clearing
|
|
* the msb. Ref: [Page 16] of http://tools.ietf.org/html/rfc792:
|
|
|
|
If the time is not available in milliseconds or cannot be provided
|
|
with respect to midnight UT then any time can be inserted in a
|
|
timestamp provided the high order bit of the timestamp is also set
|
|
to indicate this non-standard value.
|
|
*/
|
|
be_ts = tvb_get_ntohl(tvb, offset) & 0x7fffffff;
|
|
le_ts = tvb_get_letohl(tvb, offset) & 0x7fffffff;
|
|
|
|
if (be_ts < MSPERDAY && le_ts >= MSPERDAY) {
|
|
return be_ts;
|
|
}
|
|
|
|
if (le_ts < MSPERDAY && be_ts >= MSPERDAY) {
|
|
return le_ts;
|
|
}
|
|
|
|
if (be_ts < MSPERDAY && le_ts < MSPERDAY) {
|
|
guint32 saved_be_ts = be_ts;
|
|
guint32 saved_le_ts = le_ts;
|
|
|
|
/* Is this a rollover to a new day, clocks not synchronized, different
|
|
* timezones between originate and receive/transmit, .. what??? */
|
|
if (be_ts < comp_ts && be_ts <= (MSPERDAY / 4)
|
|
&& comp_ts >= (MSPERDAY - (MSPERDAY / 4)))
|
|
be_ts += MSPERDAY; /* Assume a rollover to a new day */
|
|
if (le_ts < comp_ts && le_ts <= (MSPERDAY / 4)
|
|
&& comp_ts >= (MSPERDAY - (MSPERDAY / 4)))
|
|
le_ts += MSPERDAY; /* Assume a rollover to a new day */
|
|
if ((be_ts - comp_ts) < (le_ts - comp_ts))
|
|
return saved_be_ts;
|
|
return saved_le_ts;
|
|
}
|
|
|
|
/* Both are bigger than MSPERDAY, but neither one's msb's are set. This
|
|
* is clearly invalid, but now what TODO? For now, take the one closest to
|
|
* the comparative timestamp, which is another way of saying, "let's
|
|
* return a deterministic wild guess. */
|
|
if ((be_ts - comp_ts) < (le_ts - comp_ts)) {
|
|
return be_ts;
|
|
}
|
|
return le_ts;
|
|
} /* get_best_guess_mstimeofday() */
|
|
|
|
static gboolean
|
|
capture_icmp(const guchar *pd _U_, int offset _U_, int len _U_, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_)
|
|
{
|
|
capture_dissector_increment_count(cpinfo, proto_icmp);
|
|
return TRUE;
|
|
}
|
|
|
|
/*
|
|
* RFC 792 for basic ICMP.
|
|
* RFC 1191 for ICMP_FRAG_NEEDED (with MTU of next hop).
|
|
* RFC 1256 for router discovery messages.
|
|
* RFC 2002 and 3012 for Mobile IP stuff.
|
|
*/
|
|
static int
|
|
dissect_icmp(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data)
|
|
{
|
|
proto_tree *icmp_tree = NULL;
|
|
proto_item *ti, *checksum_item;
|
|
guint8 icmp_type;
|
|
guint8 icmp_code;
|
|
guint8 icmp_original_dgram_length;
|
|
guint captured_length, reported_length;
|
|
const gchar *type_str, *code_str;
|
|
guint32 num_addrs = 0;
|
|
guint32 addr_entry_size = 0;
|
|
guint32 i;
|
|
gboolean save_in_error_pkt;
|
|
tvbuff_t *next_tvb;
|
|
guint32 conv_key[2];
|
|
icmp_transaction_t *trans = NULL;
|
|
nstime_t ts, time_relative;
|
|
ws_ip *iph = (ws_ip*)data;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ICMP");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
/* To do: check for runts, errs, etc. */
|
|
icmp_type = tvb_get_guint8(tvb, 0);
|
|
icmp_code = tvb_get_guint8(tvb, 1);
|
|
/*length of original datagram carried in the ICMP payload. In terms of 32 bit
|
|
* words.*/
|
|
icmp_original_dgram_length = tvb_get_guint8(tvb, 5);
|
|
|
|
type_str =
|
|
val_to_str_const(icmp_type, icmp_type_str,
|
|
"Unknown ICMP (obsolete or malformed?)");
|
|
|
|
switch (icmp_type) {
|
|
case ICMP_UNREACH:
|
|
code_str =
|
|
val_to_str(icmp_code, unreach_code_str,
|
|
"Unknown code: %u");
|
|
break;
|
|
case ICMP_REDIRECT:
|
|
code_str =
|
|
val_to_str(icmp_code, redir_code_str,
|
|
"Unknown code: %u");
|
|
break;
|
|
case ICMP_ALTHOST:
|
|
code_str =
|
|
val_to_str(icmp_code, alt_host_code_str,
|
|
"Unknown code: %u");
|
|
icmp_original_dgram_length = 0;
|
|
break;
|
|
case ICMP_RTRADVERT:
|
|
switch (icmp_code) {
|
|
case 0: /* Mobile-Ip */
|
|
case 16: /* Mobile-Ip */
|
|
type_str = "Mobile IP Advertisement";
|
|
break;
|
|
} /* switch icmp_code */
|
|
code_str =
|
|
val_to_str(icmp_code, rtradvert_code_str,
|
|
"Unknown code: %u");
|
|
break;
|
|
case ICMP_TIMXCEED:
|
|
code_str =
|
|
val_to_str(icmp_code, ttl_code_str,
|
|
"Unknown code: %u");
|
|
break;
|
|
case ICMP_PARAMPROB:
|
|
code_str =
|
|
val_to_str(icmp_code, par_code_str,
|
|
"Unknown code: %u");
|
|
break;
|
|
case ICMP_PHOTURIS:
|
|
code_str =
|
|
val_to_str(icmp_code, photuris_code_str,
|
|
"Unknown code: %u");
|
|
break;
|
|
default:
|
|
code_str = NULL;
|
|
break;
|
|
}
|
|
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "%-20s", type_str);
|
|
if (code_str) {
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (%s)", code_str);
|
|
}
|
|
|
|
captured_length = tvb_captured_length(tvb);
|
|
reported_length = tvb_reported_length(tvb);
|
|
|
|
ti = proto_tree_add_item(tree, proto_icmp, tvb, 0, captured_length, ENC_NA);
|
|
icmp_tree = proto_item_add_subtree(ti, ett_icmp);
|
|
|
|
ti = proto_tree_add_item(icmp_tree, hf_icmp_type, tvb, 0, 1,
|
|
ENC_BIG_ENDIAN);
|
|
proto_item_append_text(ti, " (%s)", type_str);
|
|
|
|
ti = proto_tree_add_item(icmp_tree, hf_icmp_code, tvb, 1, 1,
|
|
ENC_BIG_ENDIAN);
|
|
if (code_str) {
|
|
proto_item_append_text(ti, " (%s)", code_str);
|
|
}
|
|
|
|
if (!pinfo->fragmented && captured_length >= reported_length
|
|
&& !pinfo->flags.in_error_pkt) {
|
|
/* The packet isn't part of a fragmented datagram, isn't
|
|
truncated, and isn't the payload of an error packet, so we can checksum
|
|
it. */
|
|
proto_tree_add_checksum(icmp_tree, tvb, 2, hf_icmp_checksum, hf_icmp_checksum_status, &ei_icmp_checksum, pinfo, ip_checksum_tvb(tvb, 0, reported_length),
|
|
ENC_BIG_ENDIAN, PROTO_CHECKSUM_VERIFY|PROTO_CHECKSUM_IN_CKSUM);
|
|
} else {
|
|
checksum_item = proto_tree_add_checksum(icmp_tree, tvb, 2, hf_icmp_checksum, hf_icmp_checksum_status, &ei_icmp_checksum, pinfo, 0,
|
|
ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
|
|
proto_item_append_text(checksum_item, " [%s]",
|
|
pinfo->flags.in_error_pkt ? "in ICMP error packet" : "fragmented datagram");
|
|
}
|
|
|
|
/* Decode the second 4 bytes of the packet. */
|
|
switch (icmp_type) {
|
|
case ICMP_ECHOREPLY:
|
|
case ICMP_ECHO:
|
|
case ICMP_TSTAMP:
|
|
case ICMP_TSTAMPREPLY:
|
|
case ICMP_IREQ:
|
|
case ICMP_IREQREPLY:
|
|
case ICMP_MASKREQ:
|
|
case ICMP_MASKREPLY:
|
|
proto_tree_add_item(icmp_tree, hf_icmp_ident, tvb, 4, 2,
|
|
ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(icmp_tree, hf_icmp_ident_le, tvb, 4, 2,
|
|
ENC_LITTLE_ENDIAN);
|
|
proto_tree_add_item(icmp_tree, hf_icmp_seq_num, tvb, 6, 2,
|
|
ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(icmp_tree, hf_icmp_seq_num_le, tvb, 6,
|
|
2, ENC_LITTLE_ENDIAN);
|
|
col_append_fstr(pinfo->cinfo, COL_INFO,
|
|
" id=0x%04x, seq=%u/%u",
|
|
tvb_get_ntohs(tvb, 4), tvb_get_ntohs(tvb,
|
|
6),
|
|
tvb_get_letohs(tvb, 6));
|
|
if (iph != NULL) {
|
|
col_append_fstr(pinfo->cinfo, COL_INFO,
|
|
", ttl=%u",
|
|
iph->ip_ttl);
|
|
}
|
|
break;
|
|
|
|
case ICMP_UNREACH:
|
|
|
|
/* If icmp_original_dgram_length > 0, then this packet is compliant with RFC 4884 and
|
|
* interpret the 6th octet as length of the original datagram
|
|
*/
|
|
if (icmp_original_dgram_length > 0) {
|
|
proto_tree_add_item(icmp_tree, hf_icmp_length,
|
|
tvb, 5, 1,
|
|
ENC_BIG_ENDIAN);
|
|
ti = proto_tree_add_uint(icmp_tree, hf_icmp_length_original_datagram,
|
|
tvb, 5, 1,
|
|
icmp_original_dgram_length * 4);
|
|
PROTO_ITEM_SET_GENERATED(ti);
|
|
}
|
|
|
|
|
|
switch (icmp_code) {
|
|
case ICMP_FRAG_NEEDED:
|
|
proto_tree_add_item(icmp_tree, hf_icmp_unused, tvb, 4,
|
|
2, ENC_NA);
|
|
proto_tree_add_item(icmp_tree, hf_icmp_mtu, tvb, 6,
|
|
2, ENC_BIG_ENDIAN);
|
|
break;
|
|
default:
|
|
proto_tree_add_item(icmp_tree, hf_icmp_unused, tvb, 4,
|
|
4, ENC_NA);
|
|
}
|
|
break;
|
|
|
|
case ICMP_RTRADVERT:
|
|
proto_tree_add_item_ret_uint(icmp_tree, hf_icmp_num_addrs, tvb, 4, 1, ENC_BIG_ENDIAN, &num_addrs);
|
|
proto_tree_add_item_ret_uint(icmp_tree, hf_icmp_addr_entry_size, tvb, 5, 1, ENC_BIG_ENDIAN, &addr_entry_size);
|
|
ti = proto_tree_add_item(icmp_tree, hf_icmp_lifetime, tvb, 6, 2, ENC_BIG_ENDIAN);
|
|
proto_item_append_text(ti, " (%s)", signed_time_secs_to_str(wmem_packet_scope(), tvb_get_ntohs(tvb, 6)));
|
|
break;
|
|
|
|
case ICMP_PARAMPROB:
|
|
proto_tree_add_item(icmp_tree, hf_icmp_pointer, tvb, 4, 1, ENC_BIG_ENDIAN);
|
|
if (icmp_original_dgram_length > 0) {
|
|
proto_tree_add_item(icmp_tree, hf_icmp_length,
|
|
tvb, 5, 1,
|
|
ENC_BIG_ENDIAN);
|
|
ti = proto_tree_add_uint(icmp_tree, hf_icmp_length_original_datagram,
|
|
tvb, 5, 1,
|
|
icmp_original_dgram_length * 4);
|
|
PROTO_ITEM_SET_GENERATED(ti);
|
|
}
|
|
break;
|
|
|
|
case ICMP_REDIRECT:
|
|
proto_tree_add_item(icmp_tree, hf_icmp_redir_gw, tvb, 4, 4,
|
|
ENC_BIG_ENDIAN);
|
|
break;
|
|
|
|
case ICMP_TIMXCEED:
|
|
if (icmp_original_dgram_length > 0) {
|
|
proto_tree_add_item(icmp_tree, hf_icmp_length,
|
|
tvb, 5, 1,
|
|
ENC_BIG_ENDIAN);
|
|
ti = proto_tree_add_uint(icmp_tree, hf_icmp_length_original_datagram,
|
|
tvb, 5, 1,
|
|
icmp_original_dgram_length * 4);
|
|
PROTO_ITEM_SET_GENERATED(ti);
|
|
}
|
|
}
|
|
|
|
/* Decode the additional information in the packet. */
|
|
switch (icmp_type) {
|
|
case ICMP_UNREACH:
|
|
case ICMP_TIMXCEED:
|
|
case ICMP_PARAMPROB:
|
|
case ICMP_SOURCEQUENCH:
|
|
case ICMP_REDIRECT:
|
|
/* Save the current value of the "we're inside an error packet"
|
|
flag, and set that flag; subdissectors may treat packets
|
|
that are the payload of error packets differently from
|
|
"real" packets. */
|
|
save_in_error_pkt = pinfo->flags.in_error_pkt;
|
|
pinfo->flags.in_error_pkt = TRUE;
|
|
|
|
/* Decode the IP header and first 64 bits of data from the
|
|
original datagram. */
|
|
next_tvb = tvb_new_subset_remaining(tvb, 8);
|
|
|
|
/* If the packet is compliant with RFC 4884, then it has
|
|
* icmp_original_dgram_length*4 bytes of original IP packet that needs
|
|
* to be decoded, followed by extension objects.
|
|
*/
|
|
|
|
if (icmp_type == ICMP_REDIRECT) {
|
|
/* No icmp_original_dgram_length is available for redirect message,
|
|
* we expect a max of Internet Header + 64 bits of Original Data Datagram */
|
|
set_actual_length(next_tvb, ((tvb_get_guint8(tvb, 8) & 0x0f) * 4) + 8);
|
|
} else if (icmp_original_dgram_length
|
|
&& (tvb_reported_length(tvb) >
|
|
(guint) (8 + icmp_original_dgram_length * 4))
|
|
&& (tvb_get_ntohs(tvb, 8 + 2) >
|
|
(guint) icmp_original_dgram_length * 4)) {
|
|
set_actual_length(next_tvb,
|
|
((tvb_get_guint8(tvb, 8) & 0x0f) + icmp_original_dgram_length) * 4);
|
|
} else {
|
|
/* There is a collision between RFC 1812 and draft-ietf-mpls-icmp-02.
|
|
We don't know how to decode the 128th and following bytes of the ICMP payload.
|
|
According to draft-ietf-mpls-icmp-02, these bytes should be decoded as MPLS extensions
|
|
whereas RFC 1812 tells us to decode them as a portion of the original packet.
|
|
Let the user decide.
|
|
|
|
Here the user decided to favor MPLS extensions.
|
|
Force the IP dissector to decode only the first 128 bytes. */
|
|
if ((tvb_reported_length(tvb) > 8 + 128) &&
|
|
favor_icmp_mpls_ext
|
|
&& (tvb_get_ntohs(tvb, 8 + 2) > 128)) {
|
|
set_actual_length(next_tvb, 128);
|
|
}
|
|
}
|
|
|
|
call_dissector(ip_handle, next_tvb, pinfo, icmp_tree);
|
|
|
|
/* Restore the "we're inside an error packet" flag. */
|
|
pinfo->flags.in_error_pkt = save_in_error_pkt;
|
|
|
|
/* Decode MPLS extensions if the payload has at least 128 bytes, and
|
|
- the original packet in the ICMP payload has less than 128 bytes, or
|
|
- the user favors the MPLS extensions analysis */
|
|
if ((tvb_reported_length(tvb) > 8 + 128)
|
|
&& (tvb_get_ntohs(tvb, 8 + 2) <= 128
|
|
|| favor_icmp_mpls_ext)) {
|
|
dissect_extensions(tvb, pinfo, 8 + 128, icmp_tree);
|
|
}
|
|
break;
|
|
case ICMP_ECHOREPLY:
|
|
case ICMP_ECHO:
|
|
if (icmp_type == ICMP_ECHOREPLY) {
|
|
if (!pinfo->flags.in_error_pkt) {
|
|
conv_key[0] =
|
|
(guint32) tvb_get_ntohs(tvb, 2);
|
|
if (pinfo->flags.in_gre_pkt)
|
|
conv_key[0] |= 0x00010000; /* set a bit for "in GRE" */
|
|
conv_key[1] =
|
|
((guint32) tvb_get_ntohs(tvb, 4) << 16) |
|
|
tvb_get_ntohs(tvb, 6);
|
|
trans =
|
|
transaction_end(pinfo, icmp_tree,
|
|
conv_key);
|
|
}
|
|
} else {
|
|
if (!pinfo->flags.in_error_pkt) {
|
|
guint16 tmp[2];
|
|
|
|
tmp[0] = ~tvb_get_ntohs(tvb, 2);
|
|
tmp[1] = ~0x0800; /* The difference between echo request & reply */
|
|
conv_key[0] =
|
|
ip_checksum((guint8 *) & tmp,
|
|
sizeof(tmp));
|
|
if (conv_key[0] == 0) {
|
|
conv_key[0] = 0xffff;
|
|
}
|
|
if (pinfo->flags.in_gre_pkt) {
|
|
conv_key[0] |= 0x00010000; /* set a bit for "in GRE" */
|
|
}
|
|
conv_key[1] =
|
|
((guint32) tvb_get_ntohs(tvb, 4) << 16) |
|
|
tvb_get_ntohs(tvb, 6);
|
|
trans =
|
|
transaction_start(pinfo, icmp_tree,
|
|
conv_key);
|
|
}
|
|
}
|
|
|
|
/* Make sure we have enough bytes in the payload before trying to
|
|
* see if the data looks like a timestamp; otherwise we'll get
|
|
* malformed packets as we try to access data that isn't there. */
|
|
if (tvb_captured_length_remaining(tvb, 8) < 8) {
|
|
if (tvb_captured_length_remaining(tvb, 8) > 0) {
|
|
call_data_dissector(tvb_new_subset_remaining
|
|
(tvb, 8), pinfo, icmp_tree);
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Interpret the first 8 bytes of the icmp data as a timestamp
|
|
* But only if it does look like it's a timestamp.
|
|
*
|
|
* FIXME:
|
|
* Timestamps could be in different formats depending on the OS
|
|
*/
|
|
ts.secs = tvb_get_ntohl(tvb, 8);
|
|
ts.nsecs = tvb_get_ntohl(tvb, 8 + 4); /* Leave at microsec resolution for now */
|
|
if (abs((int)(ts.secs - pinfo->abs_ts.secs)) >=
|
|
3600 * 24 || ts.nsecs >= 1000000) {
|
|
/* Timestamp does not look right in BE, try LE representation */
|
|
ts.secs = tvb_get_letohl(tvb, 8);
|
|
ts.nsecs = tvb_get_letohl(tvb, 8 + 4); /* Leave at microsec resolution for now */
|
|
}
|
|
if (abs((int)(ts.secs - pinfo->abs_ts.secs)) <
|
|
3600 * 24 && ts.nsecs < 1000000) {
|
|
ts.nsecs *= 1000; /* Convert to nanosec resolution */
|
|
proto_tree_add_time(icmp_tree, hf_icmp_data_time,
|
|
tvb, 8, 8, &ts);
|
|
nstime_delta(&time_relative, &pinfo->abs_ts,
|
|
&ts);
|
|
ti = proto_tree_add_time(icmp_tree,
|
|
hf_icmp_data_time_relative,
|
|
tvb, 8, 8,
|
|
&time_relative);
|
|
PROTO_ITEM_SET_GENERATED(ti);
|
|
call_data_dissector(tvb_new_subset_remaining(tvb,
|
|
8 + 8),
|
|
pinfo, icmp_tree);
|
|
} else {
|
|
call_data_dissector(tvb_new_subset_remaining(tvb, 8),
|
|
pinfo, icmp_tree);
|
|
}
|
|
break;
|
|
|
|
case ICMP_RTRADVERT:
|
|
if (addr_entry_size == 2) {
|
|
for (i = 0; i < num_addrs; i++) {
|
|
proto_tree_add_item(icmp_tree, hf_icmp_router_address, tvb, 8 + (i * 8), 4, ENC_NA);
|
|
proto_tree_add_item(icmp_tree, hf_icmp_pref_level, tvb, 12 + (i * 8), 4, ENC_NA);
|
|
}
|
|
if ((icmp_code == 0) || (icmp_code == 16)) {
|
|
/* Mobile-Ip */
|
|
dissect_mip_extensions(tvb, 8 + i * 8,
|
|
icmp_tree);
|
|
}
|
|
} else {
|
|
call_data_dissector(tvb_new_subset_remaining(tvb, 8),
|
|
pinfo, icmp_tree);
|
|
}
|
|
break;
|
|
|
|
case ICMP_TSTAMP:
|
|
case ICMP_TSTAMPREPLY:
|
|
{
|
|
guint32 frame_ts, orig_ts;
|
|
|
|
frame_ts = (guint32)(((pinfo->abs_ts.secs * 1000) +
|
|
(pinfo->abs_ts.nsecs / 1000000)) %
|
|
86400000);
|
|
|
|
orig_ts = get_best_guess_mstimeofday(tvb, 8, frame_ts);
|
|
ti = proto_tree_add_item(icmp_tree, hf_icmp_originate_timestamp, tvb, 8, 4, ENC_BIG_ENDIAN);
|
|
proto_item_append_text(ti, " (%s after midnight UTC)", signed_time_msecs_to_str(wmem_packet_scope(), orig_ts));
|
|
|
|
ti = proto_tree_add_item(icmp_tree, hf_icmp_receive_timestamp, tvb, 12, 4, ENC_BIG_ENDIAN);
|
|
proto_item_append_text(ti, " (%s after midnight UTC)", signed_time_msecs_to_str(wmem_packet_scope(), get_best_guess_mstimeofday(tvb, 12, frame_ts)));
|
|
|
|
ti = proto_tree_add_item(icmp_tree, hf_icmp_transmit_timestamp, tvb, 16, 4, ENC_BIG_ENDIAN);
|
|
proto_item_append_text(ti, " (%s after midnight UTC)", signed_time_msecs_to_str(wmem_packet_scope(), get_best_guess_mstimeofday(tvb, 16, frame_ts)));
|
|
|
|
}
|
|
break;
|
|
|
|
case ICMP_MASKREQ:
|
|
case ICMP_MASKREPLY:
|
|
proto_tree_add_item(icmp_tree, hf_icmp_address_mask, tvb, 8, 4, ENC_BIG_ENDIAN);
|
|
break;
|
|
}
|
|
|
|
if (!PINFO_FD_VISITED(pinfo)) {
|
|
icmp_info_t *p_icmp_info = wmem_new(wmem_file_scope(), icmp_info_t);
|
|
p_icmp_info->type = icmp_type;
|
|
p_icmp_info->code = icmp_code;
|
|
p_add_proto_data(wmem_file_scope(), pinfo, proto_icmp, 0, p_icmp_info);
|
|
}
|
|
|
|
if (trans) {
|
|
tap_queue_packet(icmp_tap, pinfo, trans);
|
|
}
|
|
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
|
|
void proto_register_icmp(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{&hf_icmp_type,
|
|
{"Type", "icmp.type", FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_code,
|
|
{"Code", "icmp.code", FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_checksum,
|
|
{"Checksum", "icmp.checksum", FT_UINT16, BASE_HEX, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_checksum_status,
|
|
{"Checksum Status", "icmp.checksum.status", FT_UINT8, BASE_NONE,
|
|
VALS(proto_checksum_vals), 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_unused,
|
|
{"Unused", "icmp.unused", FT_BYTES,
|
|
BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_reserved,
|
|
{"Reserved", "icmp.reserved", FT_BYTES,
|
|
BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_ident,
|
|
{"Identifier (BE)", "icmp.ident", FT_UINT16, BASE_DEC_HEX,
|
|
NULL, 0x0,
|
|
"Identifier (big endian representation)", HFILL}},
|
|
|
|
{&hf_icmp_ident_le,
|
|
{"Identifier (LE)", "icmp.ident", FT_UINT16, BASE_DEC_HEX,
|
|
NULL, 0x0,
|
|
"Identifier (little endian representation)", HFILL}},
|
|
|
|
{&hf_icmp_seq_num,
|
|
{"Sequence number (BE)", "icmp.seq", FT_UINT16,
|
|
BASE_DEC_HEX, NULL, 0x0,
|
|
"Sequence number (big endian representation)", HFILL}},
|
|
|
|
{&hf_icmp_seq_num_le,
|
|
{"Sequence number (LE)", "icmp.seq_le", FT_UINT16,
|
|
BASE_DEC_HEX, NULL,
|
|
0x0, "Sequence number (little endian representation)",
|
|
HFILL}},
|
|
|
|
{&hf_icmp_mtu,
|
|
{"MTU of next hop", "icmp.mtu", FT_UINT16, BASE_DEC, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_num_addrs,
|
|
{"Number of addresses", "icmp.num_addrs", FT_UINT8, BASE_DEC, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_addr_entry_size,
|
|
{"Address entry size", "icmp.addr_entry_size", FT_UINT8, BASE_DEC, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_lifetime,
|
|
{"Lifetime", "icmp.lifetime", FT_UINT16, BASE_DEC, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_pointer,
|
|
{"Pointer", "icmp.pointer", FT_UINT32, BASE_DEC, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_router_address,
|
|
{"Router address", "icmp.router_address", FT_IPv4, BASE_NONE, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_pref_level,
|
|
{"Preference level", "icmp.pref_level", FT_INT32, BASE_DEC, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_originate_timestamp,
|
|
{"Originate timestamp", "icmp.originate_timestamp", FT_UINT32, BASE_DEC, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_receive_timestamp,
|
|
{"Receive timestamp", "icmp.receive_timestamp", FT_UINT32, BASE_DEC, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_transmit_timestamp,
|
|
{"Transmit timestamp", "icmp.transmit_timestamp", FT_UINT32, BASE_DEC, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_address_mask,
|
|
{"Address Mask", "icmp.address_mask", FT_IPv4, BASE_NONE, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_redir_gw,
|
|
{"Gateway address", "icmp.redir_gw", FT_IPv4, BASE_NONE,
|
|
NULL, 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_mip_type,
|
|
{"Extension Type", "icmp.mip.type", FT_UINT8, BASE_DEC,
|
|
VALS(mip_extensions), 0x0, NULL, HFILL}},
|
|
|
|
{&hf_icmp_mip_length,
|
|
{"Length", "icmp.mip.length", FT_UINT8, BASE_DEC, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_mip_prefix_length,
|
|
{"Prefix Length", "icmp.mip.prefixlength", FT_UINT8,
|
|
BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_mip_seq,
|
|
{"Sequence Number", "icmp.mip.seq", FT_UINT16, BASE_DEC,
|
|
NULL, 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_mip_life,
|
|
{"Registration Lifetime", "icmp.mip.life", FT_UINT16,
|
|
BASE_DEC, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_mip_flags,
|
|
{"Flags", "icmp.mip.flags", FT_UINT16, BASE_HEX, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_mip_r,
|
|
{"Registration Required", "icmp.mip.r", FT_BOOLEAN, 16,
|
|
NULL, 0x8000,
|
|
"Registration with this FA is required", HFILL}},
|
|
|
|
{&hf_icmp_mip_b,
|
|
{"Busy", "icmp.mip.b", FT_BOOLEAN, 16, NULL, 0x4000,
|
|
"This FA will not accept requests at this time", HFILL}},
|
|
|
|
{&hf_icmp_mip_h,
|
|
{"Home Agent", "icmp.mip.h", FT_BOOLEAN, 16, NULL, 0x2000,
|
|
"Home Agent Services Offered", HFILL}},
|
|
|
|
{&hf_icmp_mip_f,
|
|
{"Foreign Agent", "icmp.mip.f", FT_BOOLEAN, 16, NULL,
|
|
0x1000,
|
|
"Foreign Agent Services Offered", HFILL}},
|
|
|
|
{&hf_icmp_mip_m,
|
|
{"Minimal Encapsulation", "icmp.mip.m", FT_BOOLEAN, 16,
|
|
NULL, 0x0800,
|
|
"Minimal encapsulation tunneled datagram support",
|
|
HFILL}},
|
|
|
|
{&hf_icmp_mip_g,
|
|
{"GRE", "icmp.mip.g", FT_BOOLEAN, 16, NULL, 0x0400,
|
|
"GRE encapsulated tunneled datagram support", HFILL}},
|
|
|
|
{&hf_icmp_mip_v,
|
|
{"VJ Comp", "icmp.mip.v", FT_BOOLEAN, 16, NULL, 0x0200,
|
|
"Van Jacobson Header Compression Support", HFILL}},
|
|
|
|
{&hf_icmp_mip_rt,
|
|
{"Reverse tunneling", "icmp.mip.rt", FT_BOOLEAN, 16, NULL,
|
|
0x0100,
|
|
"Reverse tunneling support", HFILL}},
|
|
|
|
{&hf_icmp_mip_u,
|
|
{"UDP tunneling", "icmp.mip.u", FT_BOOLEAN, 16, NULL,
|
|
0x0080,
|
|
"UDP tunneling support", HFILL}},
|
|
|
|
{&hf_icmp_mip_x,
|
|
{"Revocation support", "icmp.mip.x", FT_BOOLEAN, 16, NULL,
|
|
0x0040,
|
|
"Registration revocation support", HFILL}},
|
|
|
|
{&hf_icmp_mip_reserved,
|
|
{"Reserved", "icmp.mip.reserved", FT_UINT16, BASE_HEX,
|
|
NULL, 0x003f,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_mip_coa,
|
|
{"Care-Of-Address", "icmp.mip.coa", FT_IPv4, BASE_NONE,
|
|
NULL, 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_mip_challenge,
|
|
{"Challenge", "icmp.mip.challenge", FT_BYTES, BASE_NONE,
|
|
NULL, 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_mip_content,
|
|
{"Content", "icmp.mip.content", FT_BYTES, BASE_NONE,
|
|
NULL, 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_ext,
|
|
{"ICMP Extensions", "icmp.ext", FT_NONE, BASE_NONE, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_ext_version,
|
|
{"Version", "icmp.ext.version", FT_UINT8, BASE_DEC, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_ext_reserved,
|
|
{"Reserved", "icmp.ext.res", FT_UINT16, BASE_HEX, NULL,
|
|
0x0fff,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_ext_checksum,
|
|
{"Checksum", "icmp.ext.checksum", FT_UINT16, BASE_HEX,
|
|
NULL, 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_ext_checksum_status,
|
|
{"Checksum Status", "icmp.ext.checksum.status", FT_UINT8, BASE_NONE,
|
|
VALS(proto_checksum_vals),
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_ext_length,
|
|
{"Length", "icmp.ext.length", FT_UINT16, BASE_DEC, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_ext_class,
|
|
{"Class", "icmp.ext.class", FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_ext_c_type,
|
|
{"C-Type", "icmp.ext.ctype", FT_UINT8, BASE_DEC, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_ext_data,
|
|
{"Data", "icmp.ext.data", FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_mpls_label,
|
|
{"Label", "icmp.mpls.label", FT_UINT24, BASE_DEC, NULL,
|
|
0x00fffff0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_mpls_exp,
|
|
{"Experimental", "icmp.mpls.exp", FT_UINT24, BASE_DEC,
|
|
NULL, 0x0e,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_mpls_s,
|
|
{"Stack bit", "icmp.mpls.s", FT_BOOLEAN, 24,
|
|
TFS(&tfs_set_notset), 0x01,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_mpls_ttl,
|
|
{"Time to live", "icmp.mpls.ttl", FT_UINT8, BASE_DEC,
|
|
NULL, 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_mpls_data,
|
|
{"Data", "icmp.mpls.data", FT_BYTES, BASE_NONE ,
|
|
NULL, 0x0,
|
|
NULL, HFILL}},
|
|
|
|
{&hf_icmp_resp_in,
|
|
{"Response frame", "icmp.resp_in", FT_FRAMENUM, BASE_NONE,
|
|
FRAMENUM_TYPE(FT_FRAMENUM_RESPONSE), 0x0,
|
|
"The frame number of the corresponding response",
|
|
HFILL}},
|
|
|
|
{&hf_icmp_no_resp,
|
|
{"No response seen", "icmp.no_resp", FT_NONE, BASE_NONE,
|
|
NULL, 0x0,
|
|
"No corresponding response frame was seen",
|
|
HFILL}},
|
|
|
|
{&hf_icmp_resp_to,
|
|
{"Request frame", "icmp.resp_to", FT_FRAMENUM, BASE_NONE,
|
|
FRAMENUM_TYPE(FT_FRAMENUM_REQUEST), 0x0,
|
|
"The frame number of the corresponding request", HFILL}},
|
|
|
|
{&hf_icmp_resptime,
|
|
{"Response time", "icmp.resptime", FT_DOUBLE, BASE_NONE,
|
|
NULL, 0x0,
|
|
"The time between the request and the response, in ms.",
|
|
HFILL}},
|
|
|
|
{&hf_icmp_data_time,
|
|
{"Timestamp from icmp data", "icmp.data_time",
|
|
FT_ABSOLUTE_TIME,
|
|
ABSOLUTE_TIME_LOCAL, NULL, 0x0,
|
|
"The timestamp in the first 8 bytes of the icmp data",
|
|
HFILL}},
|
|
|
|
{&hf_icmp_data_time_relative,
|
|
{"Timestamp from icmp data (relative)",
|
|
"icmp.data_time_relative",
|
|
FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0,
|
|
"The timestamp of the packet, relative to the timestamp in the first 8 bytes of the icmp data",
|
|
HFILL}},
|
|
|
|
{&hf_icmp_length,
|
|
{"Length", "icmp.length", FT_UINT8,
|
|
BASE_DEC, NULL,
|
|
0x0,
|
|
"The length of the original datagram", HFILL}},
|
|
{&hf_icmp_length_original_datagram,
|
|
{"Length of original datagram", "icmp.length.original_datagram", FT_UINT8,
|
|
BASE_DEC, NULL,
|
|
0x0,
|
|
"The length of the original datagram (length * 4)", HFILL}},
|
|
{&hf_icmp_int_info_role,
|
|
{"Interface Role", "icmp.int_info.role",
|
|
FT_UINT8, BASE_DEC, VALS(interface_role_str),
|
|
INT_INFO_INTERFACE_ROLE,
|
|
NULL, HFILL}},
|
|
{&hf_icmp_int_info_reserved,
|
|
{"Reserved", "icmp.int_info.reserved",
|
|
FT_UINT8, BASE_DEC, NULL, INT_INFO_RESERVED,
|
|
NULL, HFILL}},
|
|
{&hf_icmp_int_info_ifindex,
|
|
{"ifIndex", "icmp.int_info.ifindex", FT_BOOLEAN, 8, NULL,
|
|
INT_INFO_IFINDEX,
|
|
"True: ifIndex of the interface included; False: ifIndex of the interface not included ",
|
|
HFILL}},
|
|
{&hf_icmp_int_info_ipaddr,
|
|
{"IP Address", "icmp.int_info.ipaddr", FT_BOOLEAN, 8,
|
|
TFS(&tfs_present_not_present),
|
|
INT_INFO_IPADDR,
|
|
NULL, HFILL}},
|
|
{&hf_icmp_int_info_name,
|
|
{"Interface Name", "icmp.int_info.name_present", FT_BOOLEAN, 8,
|
|
TFS(&tfs_present_not_present),
|
|
INT_INFO_NAME,
|
|
NULL,
|
|
HFILL}},
|
|
{&hf_icmp_int_info_mtu,
|
|
{"MTU", "icmp.int_info.mtu", FT_BOOLEAN, 8, TFS(&tfs_present_not_present),
|
|
INT_INFO_MTU,
|
|
NULL, HFILL}},
|
|
{&hf_icmp_int_info_index,
|
|
{"Interface Index", "icmp.int_info.index",
|
|
FT_UINT32, BASE_DEC,
|
|
NULL, 0x0,
|
|
NULL, HFILL}},
|
|
{&hf_icmp_int_info_afi,
|
|
{"Address Family Identifier", "icmp.int_info.afi",
|
|
FT_UINT16, BASE_DEC,
|
|
NULL, 0x0,
|
|
"Address Family of the interface address", HFILL}},
|
|
{&hf_icmp_int_info_ipv4,
|
|
{"Source", "icmp.int_info.ipv4", FT_IPv4, BASE_NONE, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
{&hf_icmp_int_info_ipv6,
|
|
{"Source", "icmp.int_info.ipv6", FT_IPv6, BASE_NONE, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
{&hf_icmp_int_info_ipunknown,
|
|
{"Source", "icmp.int_info.ipunknown", FT_BYTES, BASE_NONE, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
{&hf_icmp_int_info_name_length,
|
|
{"Name Length", "icmp.int_info.name_length", FT_UINT8, BASE_DEC, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
{&hf_icmp_int_info_name_string,
|
|
{"Name", "icmp.int_info.name", FT_STRING, BASE_NONE, NULL,
|
|
0x0,
|
|
NULL, HFILL}},
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_icmp,
|
|
&ett_icmp_mip,
|
|
&ett_icmp_mip_flags,
|
|
/* MPLS extensions */
|
|
&ett_icmp_ext,
|
|
&ett_icmp_ext_object,
|
|
&ett_icmp_mpls_stack_object,
|
|
/* Interface Information Object RFC 5837 */
|
|
&ett_icmp_interface_info_object,
|
|
&ett_icmp_interface_ipaddr,
|
|
&ett_icmp_interface_name
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_icmp_resp_not_found, { "icmp.resp_not_found", PI_SEQUENCE, PI_WARN, "Response not found", EXPFILL }},
|
|
{ &ei_icmp_checksum, { "icmp.checksum_bad", PI_CHECKSUM, PI_WARN, "Bad checksum", EXPFILL }},
|
|
{ &ei_icmp_ext_checksum, { "icmp.ext.checksum_bad", PI_CHECKSUM, PI_WARN, "Bad checksum", EXPFILL }},
|
|
};
|
|
|
|
module_t *icmp_module;
|
|
expert_module_t* expert_icmp;
|
|
|
|
proto_icmp =
|
|
proto_register_protocol("Internet Control Message Protocol",
|
|
"ICMP", "icmp");
|
|
proto_register_field_array(proto_icmp, hf, array_length(hf));
|
|
expert_icmp = expert_register_protocol(proto_icmp);
|
|
expert_register_field_array(expert_icmp, ei, array_length(ei));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
icmp_module = prefs_register_protocol(proto_icmp, NULL);
|
|
|
|
prefs_register_bool_preference(icmp_module, "favor_icmp_mpls",
|
|
"Favor ICMP extensions for MPLS",
|
|
"Whether the 128th and following bytes of the ICMP payload should be decoded as MPLS extensions or as a portion of the original packet",
|
|
&favor_icmp_mpls_ext);
|
|
|
|
icmp_handle = register_dissector("icmp", dissect_icmp, proto_icmp);
|
|
icmp_tap = register_tap("icmp");
|
|
}
|
|
|
|
void proto_reg_handoff_icmp(void)
|
|
{
|
|
capture_dissector_handle_t icmp_cap_handle;
|
|
|
|
/*
|
|
* Get handle for the IP dissector.
|
|
*/
|
|
ip_handle = find_dissector_add_dependency("ip", proto_icmp);
|
|
|
|
dissector_add_uint("ip.proto", IP_PROTO_ICMP, icmp_handle);
|
|
icmp_cap_handle = create_capture_dissector_handle(capture_icmp, proto_icmp);
|
|
capture_dissector_add_uint("ip.proto", IP_PROTO_ICMP, icmp_cap_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* tab-width: 8
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
*/
|