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(Using sed : sed -i '/^ \* \$Id\$/,+1 d') Fix manually some typo (in export_object_dicom.c and crc16-plain.c) Change-Id: I4c1ae68d1c4afeace8cb195b53c715cf9e1227a8 Reviewed-on: https://code.wireshark.org/review/497 Reviewed-by: Anders Broman <a.broman58@gmail.com>
923 lines
37 KiB
C
923 lines
37 KiB
C
/* packet-bfd.c
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* Routines for Bidirectional Forwarding Detection (BFD) message dissection
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* RFCs 5880, 5881, 5882, 5883, 5884, 5885
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* (and http://tools.ietf.org/html/draft-ietf-bfd-base-01 for version 0)
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*
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* Copyright 2003, Hannes Gredler <hannes@juniper.net>
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* Copyright 2006, Balint Reczey <Balint.Reczey@ericsson.com>
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* Copyright 2007, Todd J Martin <todd.martin@acm.org>
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*
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* Copyright 2011, Jaihari Kalijanakiraman <jaiharik@ipinfusion.com>
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* Krishnamurthy Mayya <krishnamurthy.mayya@ipinfusion.com>
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* Nikitha Malgi <malgi.nikitha@ipinfusion.com>
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* - support for MPLS-TP BFD Proactive CV Message Format as per RFC 6428
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* - includes decoding support for Section MEP-ID, LSP MEP-ID, PW MEP-ID
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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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* 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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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/expert.h>
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#include "packet-bfd.h"
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void proto_register_bfd(void);
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void proto_reg_handoff_bfd(void);
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#define UDP_PORT_BFD_1HOP_CONTROL 3784 /* draft-katz-ward-bfd-v4v6-1hop-00.txt */
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#define UDP_PORT_BFD_MULTIHOP_CONTROL 4784 /* draft-ietf-bfd-multihop-05.txt */
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/* As per RFC 6428 : http://tools.ietf.org/html/rfc6428
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Section: 3.5 */
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#define TLV_TYPE_MPLSTP_SECTION_MEP 0
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#define TLV_TYPE_MPLSTP_LSP_MEP 1
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#define TLV_TYPE_MPLSTP_PW_MEP 2
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static const value_string mplstp_mep_tlv_type_values [] = {
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{ TLV_TYPE_MPLSTP_SECTION_MEP, "Section MEP-ID" },
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{ TLV_TYPE_MPLSTP_LSP_MEP, "LSP MEP-ID" },
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{ TLV_TYPE_MPLSTP_PW_MEP, "PW MEP-ID" },
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{ 0, NULL}
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};
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static const value_string bfd_control_v0_diag_values[] = {
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{ 0, "No Diagnostic" },
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{ 1, "Control Detection Time Expired" },
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{ 2, "Echo Function Failed" },
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{ 3, "Neighbor Signaled Session Down" },
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{ 4, "Forwarding Plane Reset" },
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{ 5, "Path Down" },
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{ 6, "Concatenated Path Down" },
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{ 7, "Administratively Down" },
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{ 0, NULL }
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};
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static const value_string bfd_control_v1_diag_values[] = {
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{ 0, "No Diagnostic" },
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{ 1, "Control Detection Time Expired" },
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{ 2, "Echo Function Failed" },
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{ 3, "Neighbor Signaled Session Down" },
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{ 4, "Forwarding Plane Reset" },
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{ 5, "Path Down" },
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{ 6, "Concatenated Path Down" },
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{ 7, "Administratively Down" },
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{ 8, "Reverse Concatenated Path Down" },
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{ 9, "Mis-Connectivity Defect" },
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{ 0, NULL }
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};
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static const value_string bfd_control_sta_values[] = {
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{ 0, "AdminDown" },
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{ 1, "Down" },
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{ 2, "Init" },
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{ 3, "Up" },
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{ 0, NULL }
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};
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#define BFD_AUTH_SIMPLE 1
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#define BFD_AUTH_MD5 2
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#define BFD_AUTH_MET_MD5 3
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#define BFD_AUTH_SHA1 4
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#define BFD_AUTH_MET_SHA1 5
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static const value_string bfd_control_auth_type_values[] = {
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{ BFD_AUTH_SIMPLE , "Simple Password" },
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{ BFD_AUTH_MD5 , "Keyed MD5" },
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{ BFD_AUTH_MET_MD5 , "Meticulous Keyed MD5" },
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{ BFD_AUTH_SHA1 , "Keyed SHA1" },
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{ BFD_AUTH_MET_SHA1 , "Meticulous Keyed SHA1" },
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{ 0, NULL }
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};
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/* Per the standard, the simple password must by 1-16 bytes in length */
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#define MAX_PASSWORD_LEN 16
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/* Per the standard, the length of the MD5 authentication packets must be 24
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* bytes and the checksum is 16 bytes */
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#define MD5_AUTH_LEN 24
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#define MD5_CHECKSUM_LEN 16
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/* Per the standard, the length of the SHA1 authentication packets must be 28
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* bytes and the checksum is 20 bytes */
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#define SHA1_AUTH_LEN 28
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#define SHA1_CHECKSUM_LEN 20
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#define APPEND_BOOLEAN_FLAG(flag, item, string) \
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if(flag){ \
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if(item) \
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proto_item_append_text(item, string, sep); \
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sep = cont_sep; \
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}
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static const char *const initial_sep = " (";
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static const char *const cont_sep = ", ";
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static gint proto_bfd = -1;
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static gint hf_bfd_version = -1;
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static gint hf_bfd_diag = -1;
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static gint hf_bfd_sta = -1;
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/* static gint hf_bfd_flags = -1; */
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static gint hf_bfd_flags_h = -1;
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static gint hf_bfd_flags_p = -1;
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static gint hf_bfd_flags_f = -1;
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static gint hf_bfd_flags_c = -1;
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static gint hf_bfd_flags_a = -1;
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static gint hf_bfd_flags_d = -1;
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static gint hf_bfd_flags_m = -1;
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static gint hf_bfd_flags_d_v0 = -1;
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static gint hf_bfd_flags_p_v0 = -1;
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static gint hf_bfd_flags_f_v0 = -1;
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static gint hf_bfd_detect_time_multiplier = -1;
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static gint hf_bfd_message_length = -1;
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static gint hf_bfd_my_discriminator = -1;
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static gint hf_bfd_your_discriminator = -1;
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static gint hf_bfd_desired_min_tx_interval = -1;
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static gint hf_bfd_required_min_rx_interval = -1;
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static gint hf_bfd_required_min_echo_interval = -1;
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static gint hf_bfd_auth_type = -1;
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static gint hf_bfd_auth_len = -1;
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static gint hf_bfd_auth_key = -1;
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static gint hf_bfd_auth_password = -1;
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static gint hf_bfd_auth_seq_num = -1;
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static gint ett_bfd = -1;
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static gint ett_bfd_flags = -1;
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static gint ett_bfd_auth = -1;
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static expert_field ei_bfd_auth_len_invalid = EI_INIT;
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static expert_field ei_bfd_auth_no_data = EI_INIT;
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static gint hf_mep_type = -1;
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static gint hf_mep_len = -1;
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static gint hf_mep_global_id = -1;
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static gint hf_mep_node_id = -1;
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/* static gint hf_mep_interface_no = -1; */
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static gint hf_mep_tunnel_no = -1;
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static gint hf_mep_lsp_no = -1;
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static gint hf_mep_ac_id = -1;
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static gint hf_mep_agi_type = -1;
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static gint hf_mep_agi_len = -1;
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static gint hf_mep_agi_val = -1;
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static gint hf_section_interface_no = -1;
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/*
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* Control packet version 0, draft-katz-ward-bfd-01.txt
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |Vers | Diag |H|D|P|F| Rsvd | Detect Mult | Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | My Discriminator |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Your Discriminator |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Desired Min TX Interval |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Required Min RX Interval |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Required Min Echo RX Interval |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/*
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* Control packet version 1, draft-ietf-bfd-base-04.txt
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |Vers | Diag |Sta|P|F|C|A|D|R| Detect Mult | Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | My Discriminator |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Your Discriminator |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Desired Min TX Interval |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Required Min RX Interval |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Required Min Echo RX Interval |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* An optional Authentication Section may be present:
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Auth Type | Auth Len | Authentication Data... |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* There are 5 types of authentication defined:
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* 1 - Simple Password
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* 2 - Keyed MD5
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* 3 - Meticulous Keyed MD5
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* 4 - Keyed SHA1
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* 5 - Meticulous Keyed SHA1
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*
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* The format for Simple Password authentication is:
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Auth Type | Auth Len | Auth Key ID | Password... |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | ... |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* The format for Keyed MD5 and Meticulous Keyed MD5 authentication is:
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Auth Type | Auth Len | Auth Key ID | Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Sequence Number |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Auth Key/Checksum... |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | ... |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* The format for Keyed SHA1 and Meticulous Keyed SHA1 authentication is:
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Auth Type | Auth Len | Auth Key ID | Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Sequence Number |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Auth Key/Checksum... |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | ... |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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*
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*/
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/* Given the type of authentication being used, return the required length of
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* the authentication header
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*/
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static guint8
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get_bfd_required_auth_len(guint8 auth_type)
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{
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guint8 auth_len = 0;
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switch (auth_type) {
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case BFD_AUTH_MD5:
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case BFD_AUTH_MET_MD5:
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auth_len = MD5_AUTH_LEN;
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break;
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case BFD_AUTH_SHA1:
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case BFD_AUTH_MET_SHA1:
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auth_len = SHA1_AUTH_LEN;
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break;
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default:
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break;
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}
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return auth_len;
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}
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/* Given the type of authentication being used, return the length of
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* checksum field
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*/
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static guint8
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get_bfd_checksum_len(guint8 auth_type)
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{
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guint8 checksum_len = 0;
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switch (auth_type) {
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case BFD_AUTH_MD5:
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case BFD_AUTH_MET_MD5:
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checksum_len = MD5_CHECKSUM_LEN;
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break;
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case BFD_AUTH_SHA1:
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case BFD_AUTH_MET_SHA1:
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checksum_len = SHA1_CHECKSUM_LEN;
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break;
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default:
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break;
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}
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return checksum_len;
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}
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static void
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dissect_bfd_authentication(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 24;
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guint8 auth_type;
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guint8 auth_len;
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proto_item *ti = NULL;
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proto_item *auth_item = NULL;
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proto_tree *auth_tree = NULL;
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guint8 *password;
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auth_type = tvb_get_guint8(tvb, offset);
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auth_len = tvb_get_guint8(tvb, offset + 1);
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if (tree) {
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auth_item = proto_tree_add_text(tree, tvb, offset, auth_len, "Authentication: %s",
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val_to_str(auth_type,
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bfd_control_auth_type_values,
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"Unknown Authentication Type (%d)") );
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auth_tree = proto_item_add_subtree(auth_item, ett_bfd_auth);
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proto_tree_add_item(auth_tree, hf_bfd_auth_type, tvb, offset, 1, ENC_BIG_ENDIAN);
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ti = proto_tree_add_item(auth_tree, hf_bfd_auth_len, tvb, offset + 1, 1, ENC_BIG_ENDIAN);
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proto_item_append_text(ti, " bytes");
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proto_tree_add_item(auth_tree, hf_bfd_auth_key, tvb, offset + 2, 1, ENC_BIG_ENDIAN);
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}
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switch (auth_type) {
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case BFD_AUTH_SIMPLE:
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if (tree) {
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password = tvb_get_string(wmem_packet_scope(), tvb, offset+3, auth_len-3);
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proto_tree_add_string(auth_tree, hf_bfd_auth_password, tvb, offset+3,
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auth_len-3, password);
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proto_item_append_text(auth_item, ": %s", password);
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}
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break;
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case BFD_AUTH_MD5:
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case BFD_AUTH_MET_MD5:
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case BFD_AUTH_SHA1:
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case BFD_AUTH_MET_SHA1:
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if (auth_len != get_bfd_required_auth_len(auth_type)) {
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if (tree) {
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ti = proto_tree_add_text(auth_tree, tvb, offset, auth_len,
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"Length of authentication is invalid (%d)", auth_len);
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proto_item_append_text(auth_item, ": Invalid Authentication Section");
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}
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expert_add_info_format(pinfo, ti, &ei_bfd_auth_len_invalid,
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"Length of authentication section is invalid for Authentication Type: %s",
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val_to_str(auth_type, bfd_control_auth_type_values, "Unknown Authentication Type (%d)") );
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}
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if (tree) {
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proto_tree_add_item(auth_tree, hf_bfd_auth_seq_num, tvb, offset+4, 4, ENC_BIG_ENDIAN);
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proto_tree_add_text(auth_tree, tvb, offset+8, get_bfd_checksum_len(auth_type), "Checksum: 0x%s",
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tvb_bytes_to_ep_str(tvb, offset+8, get_bfd_checksum_len(auth_type)) );
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}
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break;
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default:
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break;
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}
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}
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static void
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dissect_bfd_control(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint flags;
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guint bfd_version;
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guint bfd_diag;
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guint bfd_sta = 0;
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guint bfd_flags;
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guint bfd_flags_h = 0;
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guint bfd_flags_p = 0;
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guint bfd_flags_f = 0;
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guint bfd_flags_c = 0;
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guint bfd_flags_a = 0;
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guint bfd_flags_d = 0;
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guint bfd_flags_m = 0;
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guint bfd_flags_d_v0 = 0;
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guint bfd_flags_p_v0 = 0;
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guint bfd_flags_f_v0 = 0;
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guint bfd_detect_time_multiplier;
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guint bfd_length;
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guint bfd_my_discriminator;
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guint bfd_your_discriminator;
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guint bfd_desired_min_tx_interval;
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guint bfd_required_min_rx_interval;
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guint bfd_required_min_echo_interval;
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proto_tree *bfd_tree = NULL;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "BFD Control");
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col_clear(pinfo->cinfo, COL_INFO);
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bfd_version = (tvb_get_guint8(tvb, 0) & 0xe0) >> 5;
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bfd_diag = (tvb_get_guint8(tvb, 0) & 0x1f);
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flags = tvb_get_guint8(tvb, 1);
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switch (bfd_version) {
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case 0:
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bfd_flags = flags;
|
|
bfd_flags_h = flags & 0x80;
|
|
bfd_flags_d_v0 = flags & 0x40;
|
|
bfd_flags_p_v0 = flags & 0x20;
|
|
bfd_flags_f_v0 = flags & 0x10;
|
|
break;
|
|
case 1:
|
|
default:
|
|
bfd_sta = flags & 0xc0;
|
|
bfd_flags = flags & 0x3e;
|
|
bfd_flags_p = flags & 0x20;
|
|
bfd_flags_f = flags & 0x10;
|
|
bfd_flags_c = flags & 0x08;
|
|
bfd_flags_a = flags & 0x04;
|
|
bfd_flags_d = flags & 0x02;
|
|
bfd_flags_m = flags & 0x01;
|
|
break;
|
|
}
|
|
|
|
bfd_detect_time_multiplier = tvb_get_guint8(tvb, 2);
|
|
bfd_length = tvb_get_guint8(tvb, 3);
|
|
bfd_my_discriminator = tvb_get_ntohl(tvb, 4);
|
|
bfd_your_discriminator = tvb_get_ntohl(tvb, 8);
|
|
bfd_desired_min_tx_interval = tvb_get_ntohl(tvb, 12);
|
|
bfd_required_min_rx_interval = tvb_get_ntohl(tvb, 16);
|
|
bfd_required_min_echo_interval = tvb_get_ntohl(tvb, 20);
|
|
|
|
switch (bfd_version) {
|
|
case 0:
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "Diag: %s, Flags: 0x%02x",
|
|
val_to_str_const(bfd_diag, bfd_control_v0_diag_values, "Unknown"),
|
|
bfd_flags);
|
|
break;
|
|
case 1:
|
|
default:
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "Diag: %s, State: %s, Flags: 0x%02x",
|
|
val_to_str_const(bfd_diag, bfd_control_v1_diag_values, "Unknown"),
|
|
val_to_str_const(bfd_sta >> 6 , bfd_control_sta_values, "Unknown"),
|
|
bfd_flags);
|
|
break;
|
|
}
|
|
|
|
if (tree) {
|
|
proto_item *ti;
|
|
proto_tree *bfd_flags_tree;
|
|
const char *sep;
|
|
|
|
ti = proto_tree_add_protocol_format(tree, proto_bfd, tvb, 0, bfd_length,
|
|
"BFD Control message");
|
|
|
|
bfd_tree = proto_item_add_subtree(ti, ett_bfd);
|
|
|
|
proto_tree_add_uint(bfd_tree, hf_bfd_version, tvb, 0,
|
|
1, bfd_version << 5);
|
|
|
|
proto_tree_add_uint(bfd_tree, hf_bfd_diag, tvb, 0,
|
|
1, bfd_diag);
|
|
|
|
switch (bfd_version) {
|
|
case 0:
|
|
break;
|
|
case 1:
|
|
default:
|
|
proto_tree_add_uint(bfd_tree, hf_bfd_sta, tvb, 1,
|
|
1, bfd_sta);
|
|
|
|
break;
|
|
}
|
|
switch (bfd_version) {
|
|
case 0:
|
|
ti = proto_tree_add_text ( bfd_tree, tvb, 1, 1, "Message Flags: 0x%02x",
|
|
bfd_flags);
|
|
bfd_flags_tree = proto_item_add_subtree(ti, ett_bfd_flags);
|
|
proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_h, tvb, 1, 1, bfd_flags_h);
|
|
proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_d_v0, tvb, 1, 1, bfd_flags_d_v0);
|
|
proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_p_v0, tvb, 1, 1, bfd_flags_p_v0);
|
|
proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_f_v0, tvb, 1, 1, bfd_flags_f_v0);
|
|
|
|
sep = initial_sep;
|
|
APPEND_BOOLEAN_FLAG(bfd_flags_h, ti, "%sH");
|
|
APPEND_BOOLEAN_FLAG(bfd_flags_d_v0, ti, "%sD");
|
|
APPEND_BOOLEAN_FLAG(bfd_flags_p_v0, ti, "%sP");
|
|
APPEND_BOOLEAN_FLAG(bfd_flags_f_v0, ti, "%sF");
|
|
if (sep != initial_sep) {
|
|
proto_item_append_text (ti, ")");
|
|
}
|
|
break;
|
|
case 1:
|
|
default:
|
|
ti = proto_tree_add_text ( bfd_tree, tvb, 1, 1, "Message Flags: 0x%02x",
|
|
bfd_flags);
|
|
bfd_flags_tree = proto_item_add_subtree(ti, ett_bfd_flags);
|
|
proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_p, tvb, 1, 1, bfd_flags_p);
|
|
proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_f, tvb, 1, 1, bfd_flags_f);
|
|
proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_c, tvb, 1, 1, bfd_flags_c);
|
|
proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_a, tvb, 1, 1, bfd_flags_a);
|
|
proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_d, tvb, 1, 1, bfd_flags_d);
|
|
proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_m, tvb, 1, 1, bfd_flags_m);
|
|
|
|
sep = initial_sep;
|
|
APPEND_BOOLEAN_FLAG(bfd_flags_p, ti, "%sP");
|
|
APPEND_BOOLEAN_FLAG(bfd_flags_f, ti, "%sF");
|
|
APPEND_BOOLEAN_FLAG(bfd_flags_c, ti, "%sC");
|
|
APPEND_BOOLEAN_FLAG(bfd_flags_a, ti, "%sA");
|
|
APPEND_BOOLEAN_FLAG(bfd_flags_d, ti, "%sD");
|
|
APPEND_BOOLEAN_FLAG(bfd_flags_m, ti, "%sM");
|
|
if (sep != initial_sep) {
|
|
proto_item_append_text (ti, ")");
|
|
}
|
|
break;
|
|
}
|
|
|
|
proto_tree_add_uint_format_value(bfd_tree, hf_bfd_detect_time_multiplier, tvb, 2,
|
|
1, bfd_detect_time_multiplier,
|
|
"%u (= %u ms Detection time)",
|
|
bfd_detect_time_multiplier,
|
|
bfd_detect_time_multiplier * (bfd_desired_min_tx_interval/1000));
|
|
|
|
proto_tree_add_uint_format_value(bfd_tree, hf_bfd_message_length, tvb, 3, 1, bfd_length,
|
|
"%u bytes", bfd_length);
|
|
|
|
proto_tree_add_uint(bfd_tree, hf_bfd_my_discriminator, tvb, 4,
|
|
4, bfd_my_discriminator);
|
|
|
|
proto_tree_add_uint(bfd_tree, hf_bfd_your_discriminator, tvb, 8,
|
|
4, bfd_your_discriminator);
|
|
|
|
proto_tree_add_uint_format_value(bfd_tree, hf_bfd_desired_min_tx_interval, tvb, 12,
|
|
4, bfd_desired_min_tx_interval,
|
|
"%4u ms (%u us)",
|
|
bfd_desired_min_tx_interval/1000,
|
|
bfd_desired_min_tx_interval);
|
|
|
|
proto_tree_add_uint_format_value(bfd_tree, hf_bfd_required_min_rx_interval, tvb, 16,
|
|
4, bfd_required_min_rx_interval,
|
|
"%4u ms (%u us)",
|
|
bfd_required_min_rx_interval/1000,
|
|
bfd_required_min_rx_interval);
|
|
|
|
proto_tree_add_uint_format_value(bfd_tree, hf_bfd_required_min_echo_interval, tvb, 20,
|
|
4, bfd_required_min_echo_interval,
|
|
"%4u ms (%u us)",
|
|
bfd_required_min_echo_interval/1000,
|
|
bfd_required_min_echo_interval);
|
|
} /* if (tree) */
|
|
|
|
/* Dissect the authentication fields if the Authentication flag has
|
|
* been set
|
|
*/
|
|
if (bfd_version && bfd_flags_a) {
|
|
if (bfd_length >= 28) {
|
|
dissect_bfd_authentication(tvb, pinfo, bfd_tree);
|
|
} else {
|
|
proto_item *ti = proto_tree_add_text(bfd_tree, tvb, 24, bfd_length-24,
|
|
"Authentication: Length of the BFD frame is invalid (%d)", bfd_length);
|
|
expert_add_info(pinfo, ti, &ei_bfd_auth_no_data);
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/* BFD CV Source MEP-ID TLV Decoder,
|
|
As per RFC 6428 : http://tools.ietf.org/html/rfc6428
|
|
sections - 3.5.1, 3.5.2, 3.5.3 */
|
|
void
|
|
dissect_bfd_mep (tvbuff_t *tvb, proto_tree *tree, const int hfindex)
|
|
{
|
|
proto_item *ti;
|
|
proto_tree *bfd_tree;
|
|
gint offset = 0;
|
|
gint mep_type;
|
|
gint mep_len;
|
|
gint mep_agi_len;
|
|
|
|
if (!tree)
|
|
return;
|
|
|
|
/* Fetch the BFD control message length and move the offset
|
|
to point to the data portion after the control message */
|
|
|
|
/* The parameter hfindex is used for determining the tree under which MEP-ID TLV
|
|
has to be determined. Since according to RFC 6428, MEP-ID TLV can be used by any
|
|
OAM function, if hfindex is 0, as per this function the MEP-TLV is a part of
|
|
BFD-CV payload. If a non-zero hfindex comes, then tht TLV info will be displayed
|
|
under a particular protocol-tree. */
|
|
if (!hfindex)
|
|
{
|
|
offset = tvb_get_guint8(tvb, 3);
|
|
mep_type = tvb_get_ntohs (tvb, offset);
|
|
mep_len = tvb_get_ntohs (tvb, (offset + 2));
|
|
ti = proto_tree_add_protocol_format (tree, proto_bfd, tvb, offset, (mep_len + 4),
|
|
"MPLS-TP SOURCE MEP-ID TLV");
|
|
}
|
|
else
|
|
{
|
|
mep_type = tvb_get_ntohs (tvb, offset);
|
|
mep_len = tvb_get_ntohs (tvb, (offset + 2));
|
|
ti = proto_tree_add_protocol_format (tree, hfindex, tvb, offset, (mep_len + 4),
|
|
"MPLS-TP SOURCE MEP-ID TLV");
|
|
}
|
|
|
|
switch (mep_type) {
|
|
case TLV_TYPE_MPLSTP_SECTION_MEP:
|
|
|
|
bfd_tree = proto_item_add_subtree (ti, ett_bfd);
|
|
proto_tree_add_uint (bfd_tree, hf_mep_type , tvb, offset,
|
|
2, mep_type);
|
|
proto_tree_add_uint (bfd_tree, hf_mep_len, tvb, (offset + 2),
|
|
2, mep_len);
|
|
proto_tree_add_item (bfd_tree, hf_mep_global_id, tvb, (offset + 4),
|
|
4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item (bfd_tree, hf_mep_node_id, tvb, (offset + 8),
|
|
4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item (bfd_tree, hf_section_interface_no, tvb, (offset + 12),
|
|
4, ENC_BIG_ENDIAN);
|
|
|
|
break;
|
|
|
|
case TLV_TYPE_MPLSTP_LSP_MEP:
|
|
|
|
bfd_tree = proto_item_add_subtree (ti, ett_bfd);
|
|
proto_tree_add_uint (bfd_tree, hf_mep_type , tvb, offset,
|
|
2, mep_type);
|
|
proto_tree_add_uint (bfd_tree, hf_mep_len, tvb, (offset + 2),
|
|
2, mep_len);
|
|
proto_tree_add_item (bfd_tree, hf_mep_global_id, tvb, (offset + 4),
|
|
4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item (bfd_tree, hf_mep_node_id, tvb, (offset + 8),
|
|
4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item (bfd_tree, hf_mep_tunnel_no, tvb, (offset + 12),
|
|
2, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item (bfd_tree, hf_mep_lsp_no, tvb, (offset + 14),
|
|
2, ENC_BIG_ENDIAN);
|
|
|
|
break;
|
|
|
|
case TLV_TYPE_MPLSTP_PW_MEP:
|
|
|
|
mep_agi_len = tvb_get_guint8 (tvb, (offset + 17));
|
|
bfd_tree = proto_item_add_subtree (ti, ett_bfd);
|
|
proto_tree_add_uint (bfd_tree, hf_mep_type, tvb, offset,
|
|
2, (mep_type));
|
|
proto_tree_add_uint (bfd_tree, hf_mep_len, tvb, (offset + 2),
|
|
2, mep_len);
|
|
proto_tree_add_item (bfd_tree, hf_mep_global_id, tvb, (offset + 4),
|
|
4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item (bfd_tree, hf_mep_node_id, tvb, (offset + 8),
|
|
4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item (bfd_tree, hf_mep_ac_id, tvb, (offset + 12),
|
|
4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item (bfd_tree, hf_mep_agi_type, tvb, (offset + 16),
|
|
1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_uint (bfd_tree, hf_mep_agi_len, tvb, (offset + 17),
|
|
1, mep_agi_len);
|
|
proto_tree_add_item (bfd_tree, hf_mep_agi_val, tvb, (offset + 18),
|
|
mep_agi_len, ENC_ASCII|ENC_NA);
|
|
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
return;
|
|
}
|
|
|
|
/* Register the protocol with Wireshark */
|
|
void
|
|
proto_register_bfd(void)
|
|
{
|
|
|
|
/* Setup list of header fields */
|
|
static hf_register_info hf[] = {
|
|
{ &hf_bfd_version,
|
|
{ "Protocol Version", "bfd.version",
|
|
FT_UINT8, BASE_DEC, NULL , 0xe0,
|
|
"The version number of the BFD protocol", HFILL }
|
|
},
|
|
{ &hf_bfd_diag,
|
|
{ "Diagnostic Code", "bfd.diag",
|
|
FT_UINT8, BASE_HEX, VALS(bfd_control_v1_diag_values), 0x1f,
|
|
"This field give the reason for a BFD session failure", HFILL }
|
|
},
|
|
{ &hf_bfd_sta,
|
|
{ "Session State", "bfd.sta",
|
|
FT_UINT8, BASE_HEX, VALS(bfd_control_sta_values), 0xc0,
|
|
"The BFD state as seen by the transmitting system", HFILL }
|
|
},
|
|
#if 0
|
|
{ &hf_bfd_flags,
|
|
{ "Message Flags", "bfd.flags",
|
|
FT_UINT8, BASE_HEX, NULL, 0xf0,
|
|
NULL, HFILL }
|
|
},
|
|
#endif
|
|
{ &hf_bfd_flags_h,
|
|
{ "I hear you", "bfd.flags.h",
|
|
FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x80,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_bfd_flags_d_v0,
|
|
{ "Demand", "bfd.flags.d",
|
|
FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x40,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_bfd_flags_p_v0,
|
|
{ "Poll", "bfd.flags.p",
|
|
FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x20,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_bfd_flags_f_v0,
|
|
{ "Final", "bfd.flags.f",
|
|
FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x10,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_bfd_flags_p,
|
|
{ "Poll", "bfd.flags.p",
|
|
FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x20, /* 6 flag bits; Sta is shown separately */
|
|
"If set, the transmitting system is expecting a packet with the Final (F) bit in reply",
|
|
HFILL }
|
|
},
|
|
{ &hf_bfd_flags_f,
|
|
{ "Final", "bfd.flags.f",
|
|
FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x10, /* 6 flag bits; Sta is shown separately */
|
|
"If set, the transmitting system is replying to a packet with the Poll (P) bit set",
|
|
HFILL }
|
|
},
|
|
{ &hf_bfd_flags_c,
|
|
{ "Control Plane Independent", "bfd.flags.c",
|
|
FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x08, /* 6 flag bits; Sta is shown separately */
|
|
"If set, the BFD implementation is implemented in the forwarding plane", HFILL }
|
|
},
|
|
{ &hf_bfd_flags_a,
|
|
{ "Authentication Present", "bfd.flags.a",
|
|
FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x04, /* 6 flag bits; Sta is shown separately */
|
|
"The Authentication Section is present", HFILL }
|
|
},
|
|
{ &hf_bfd_flags_d,
|
|
{ "Demand", "bfd.flags.d",
|
|
FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x02, /* 6 flag bits; Sta is shown separately */
|
|
"If set, Demand mode is active in the transmitting system", HFILL }
|
|
},
|
|
{ &hf_bfd_flags_m,
|
|
{ "Multipoint", "bfd.flags.m",
|
|
FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x01, /* 6 flag bits; Sta is shown separately */
|
|
"Reserved for future point-to-multipoint extensions", HFILL }
|
|
},
|
|
{ &hf_bfd_detect_time_multiplier,
|
|
{ "Detect Time Multiplier", "bfd.detect_time_multiplier",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"The transmit interval multiplied by this value is the failure detection time", HFILL }
|
|
},
|
|
{ &hf_bfd_message_length,
|
|
{ "Message Length", "bfd.message_length",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Length of the BFD Control packet, in bytes", HFILL }
|
|
},
|
|
{ &hf_bfd_my_discriminator,
|
|
{ "My Discriminator", "bfd.my_discriminator",
|
|
FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_bfd_your_discriminator,
|
|
{ "Your Discriminator", "bfd.your_discriminator",
|
|
FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_bfd_desired_min_tx_interval,
|
|
{ "Desired Min TX Interval", "bfd.desired_min_tx_interval",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"The minimum interval to use when transmitting BFD Control packets", HFILL }
|
|
},
|
|
{ &hf_bfd_required_min_rx_interval,
|
|
{ "Required Min RX Interval", "bfd.required_min_rx_interval",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"The minimum interval between received BFD Control packets that this system can support", HFILL }
|
|
},
|
|
{ &hf_bfd_required_min_echo_interval,
|
|
{ "Required Min Echo Interval", "bfd.required_min_echo_interval",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"The minimum interval between received BFD Echo packets that this system can support", HFILL }
|
|
},
|
|
{ &hf_bfd_auth_type,
|
|
{ "Authentication Type", "bfd.auth.type",
|
|
FT_UINT8, BASE_DEC, VALS(bfd_control_auth_type_values), 0x0,
|
|
"The type of authentication in use on this session", HFILL }
|
|
},
|
|
{ &hf_bfd_auth_len,
|
|
{ "Authentication Length", "bfd.auth.len",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"The length, in bytes, of the authentication section", HFILL }
|
|
},
|
|
{ &hf_bfd_auth_key,
|
|
{ "Authentication Key ID", "bfd.auth.key",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"The Authentication Key ID, identifies which password is in use for this packet", HFILL }
|
|
},
|
|
{ &hf_bfd_auth_password,
|
|
{ "Password", "bfd.auth.password",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"The simple password in use on this session", HFILL }
|
|
},
|
|
{ &hf_bfd_auth_seq_num,
|
|
{ "Sequence Number", "bfd.auth.seq_num",
|
|
FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
"The Sequence Number is periodically incremented to prevent replay attacks", HFILL }
|
|
},
|
|
{ &hf_mep_type,
|
|
{ "Type", "bfd.mep.type",
|
|
FT_UINT16, BASE_DEC, VALS(mplstp_mep_tlv_type_values), 0x0,
|
|
"The type of the MEP Id", HFILL }
|
|
},
|
|
{ &hf_mep_len,
|
|
{ "Length", "bfd.mep.len",
|
|
FT_UINT16, BASE_DEC, NULL , 0x0,
|
|
"The length of the MEP Id", HFILL }
|
|
},
|
|
{ &hf_mep_global_id,
|
|
{ "Global Id", "bfd.mep.global.id",
|
|
FT_UINT32, BASE_DEC, NULL , 0x0,
|
|
"MPLS-TP Global MEP Id", HFILL }
|
|
},
|
|
{ &hf_mep_node_id,
|
|
{ "Node Id", "bfd.mep.node.id",
|
|
FT_IPv4, BASE_NONE, NULL , 0x0,
|
|
"MPLS-TP Node Identifier", HFILL }
|
|
},
|
|
#if 0
|
|
{ &hf_mep_interface_no,
|
|
{ "Interface Number", "bfd.mep.interface.no",
|
|
FT_UINT32, BASE_DEC, NULL , 0x0,
|
|
"MPLS-TP Interface Number", HFILL }
|
|
},
|
|
#endif
|
|
{ &hf_mep_tunnel_no,
|
|
{ "Tunnel Number", "bfd.mep.tunnel.no",
|
|
FT_UINT16, BASE_DEC, NULL , 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_mep_lsp_no,
|
|
{ "LSP Number", "bfd.mep.lsp.no",
|
|
FT_UINT16, BASE_DEC, NULL , 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_mep_ac_id,
|
|
{ "AC Id", "bfd.mep.ac.id",
|
|
FT_UINT32, BASE_DEC, NULL , 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_mep_agi_type,
|
|
{ "AGI TYPE", "bfd.mep.agi.type",
|
|
FT_UINT8, BASE_DEC, NULL , 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_mep_agi_len,
|
|
{ "AGI Length", "bfd.mep.agi.len",
|
|
FT_UINT8, BASE_DEC, NULL , 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_mep_agi_val,
|
|
{ "AGI value", "bfd.mep.agi.val",
|
|
FT_STRING, BASE_NONE, NULL , 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_section_interface_no,
|
|
{ "Interface Number", "bfd.mep.interface.no",
|
|
FT_UINT32, BASE_DEC, NULL , 0x0,
|
|
"MPLS-TP Interface Number", HFILL }
|
|
}
|
|
};
|
|
|
|
/* Setup protocol subtree array */
|
|
static gint *ett[] = {
|
|
&ett_bfd,
|
|
&ett_bfd_flags,
|
|
&ett_bfd_auth
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_bfd_auth_len_invalid, { "bfd.auth.len.invalid", PI_MALFORMED, PI_WARN, "Length of authentication section is invalid", EXPFILL }},
|
|
{ &ei_bfd_auth_no_data, { "bfd.auth.no_data", PI_MALFORMED, PI_WARN, "Authentication flag is set in a BFD packet, but no authentication data is present", EXPFILL }},
|
|
};
|
|
|
|
expert_module_t* expert_bfd;
|
|
|
|
/* Register the protocol name and description */
|
|
proto_bfd = proto_register_protocol("Bidirectional Forwarding Detection Control Message",
|
|
"BFD Control",
|
|
"bfd");
|
|
register_dissector("bfd", dissect_bfd_control, proto_bfd);
|
|
|
|
/* Required function calls to register the header fields and subtrees used */
|
|
proto_register_field_array(proto_bfd, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_bfd = expert_register_protocol(proto_bfd);
|
|
expert_register_field_array(expert_bfd, ei, array_length(ei));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_bfd(void)
|
|
{
|
|
dissector_handle_t bfd_control_handle;
|
|
|
|
bfd_control_handle = find_dissector("bfd");
|
|
dissector_add_uint("udp.port", UDP_PORT_BFD_1HOP_CONTROL, bfd_control_handle);
|
|
dissector_add_uint("udp.port", UDP_PORT_BFD_MULTIHOP_CONTROL, bfd_control_handle);
|
|
}
|