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wireshark/epan/dissectors/packet-mpls.c

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/* packet-mpls.c
* Routines for MPLS data packet disassembly
* RFC 3032
*
* (c) Copyright Ashok Narayanan <ashokn@cisco.com>
*
* (c) Copyright 2006, _FF_ Francesco Fondelli <francesco.fondelli@gmail.com>
* - added MPLS OAM support, ITU-T Y.1711
* - PW Associated Channel Header dissection as per RFC 4385
* - PW MPLS Control Word dissection as per RFC 4385
* - mpls subdissector table indexed by label value
* - enhanced "what's past last mpls label?" heuristic
*
* (c) Copyright 2011, Shobhank Sharma <ssharma5@ncsu.edu>
* - Removed some mpls preferences which are no longer relevant/needed like
* decode PWAC payloads as PPP traffic and assume all channel types except
* 0x21 are raw BFD.
* - MPLS extension from PW-ACH to MPLS Generic Associated Channel as per RFC 5586
* - Updated Pseudowire Associated Channel Types as per http://www.iana.org/assignments/pwe3-parameters
*
* (c) Copyright 2011, Jaihari Kalijanakiraman <jaiharik@ipinfusion.com>
* Krishnamurthy Mayya <krishnamurthy.mayya@ipinfusion.com>
* Nikitha Malgi <malgi.nikitha@ipinfusion.com>
* - Identification of BFD CC, BFD CV and ON-Demand CV ACH types as per RFC 6428, RFC 6426
* respectively and the corresponding decoding of messages
* - Decoding support for MPLS-TP Lock Instruct as per RFC 6435
* - Decoding support for MPLS-TP Fault-Management as per RFC 6427
*
* (c) Copyright 2012, Aditya Ambadkar and Diana Chris <arambadk,dvchris@ncsu.edu>
* - Added preference to select BOS label as flowlabel as per RFC 6391
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/ppptypes.h>
#include <epan/etypes.h>
#include <epan/prefs.h>
#include <epan/ipproto.h>
#include <epan/addr_resolv.h>
#include "packet-ppp.h"
#include "packet-mpls.h"
#include "packet-pw-common.h"
#include "packet-bfd.h"
/* As per RFC 6428 http://tools.ietf.org/html/rfc6428, Section: 3.3 */
#define ACH_TYPE_BFD_CC 0x0022
#define ACH_TYPE_BFD_CV 0x0023
/* As RFC 6426:http://tools.ietf.org/html/rfc6426, Section: 7.4 */
#define ACH_TYPE_ONDEMAND_CV 0x0025
static gint proto_mpls = -1;
static gint proto_pw_ach = -1;
static gint proto_pw_mcw = -1;
static gint ett_mpls = -1;
static gint ett_mpls_pw_ach = -1;
static gint ett_mpls_pw_mcw = -1;
static char PW_ACH[50] = "PW Associated Channel Header";
const value_string special_labels[] = {
{MPLS_LABEL_IP4_EXPLICIT_NULL, "IPv4 Explicit-Null"},
{MPLS_LABEL_ROUTER_ALERT, "Router Alert"},
{MPLS_LABEL_IP6_EXPLICIT_NULL, "IPv6 Explicit-Null"},
{MPLS_LABEL_IMPLICIT_NULL, "Implicit-Null"},
{MPLS_LABEL_OAM_ALERT, "OAM Alert"},
{MPLS_LABEL_GACH, "Generic Associated Channel Label (GAL)"},
{0, NULL }
};
static dissector_handle_t dissector_data;
static dissector_handle_t dissector_ipv6;
static dissector_handle_t dissector_ip;
static dissector_handle_t dissector_bfd;
static dissector_handle_t dissector_mpls_pm_dlm;
static dissector_handle_t dissector_mpls_pm_ilm;
static dissector_handle_t dissector_mpls_pm_dm;
static dissector_handle_t dissector_mpls_pm_dlm_dm;
static dissector_handle_t dissector_mpls_pm_ilm_dm;
static dissector_handle_t dissector_mpls_psc;
static dissector_handle_t dissector_mplstp_lock;
static dissector_handle_t dissector_mplstp_fm;
static dissector_handle_t dissector_pw_eth_heuristic;
static dissector_handle_t dissector_pw_fr;
static dissector_handle_t dissector_pw_hdlc_nocw_fr;
static dissector_handle_t dissector_pw_hdlc_nocw_hdlc_ppp;
static dissector_handle_t dissector_pw_eth_cw;
static dissector_handle_t dissector_pw_eth_nocw;
static dissector_handle_t dissector_pw_satop;
static dissector_handle_t dissector_itdm;
static dissector_handle_t dissector_mpls_pw_atm_n1_cw;
static dissector_handle_t dissector_mpls_pw_atm_n1_nocw;
static dissector_handle_t dissector_mpls_pw_atm_11_aal5pdu;
static dissector_handle_t dissector_mpls_pw_atm_aal5_sdu;
static dissector_handle_t dissector_pw_cesopsn;
enum mpls_default_dissector_t {
MDD_PW_ETH_HEUR = 0
,MDD_PW_SATOP
,MDD_PW_CESOPSN
,MDD_MPLS_PW_FR_DLCI
,MDD_MPLS_PW_HDLC_NOCW_FRPORT
,MDD_MPLS_PW_HDLC_NOCW_HDLC_PPP
,MDD_MPLS_PW_ETH_CW
,MDD_MPLS_PW_ETH_NOCW
,MDD_MPLS_PW_GENERIC
,MDD_ITDM
,MDD_MPLS_PW_ATM_N1_CW
,MDD_MPLS_PW_ATM_N1_NOCW
,MDD_MPLS_PW_ATM_11_OR_AAL5_PDU
,MDD_MPLS_PW_ATM_AAL5_SDU
};
/* TODO the content of mpls_default_payload menu
* should be automatically built like mpls "decode as..." menu;
* this way, mpls_default_payload will be automatically filled up when
* new mpls-specific dissector added.
*/
static const enum_val_t mpls_default_payload_defs[] = {
{
"pw satop"
,pwc_longname_pw_satop
,MDD_PW_SATOP
},
{
"pw cesopsn"
,pwc_longname_pw_cesopsn
,MDD_PW_CESOPSN
},
{
"mpls pw ethernet heuristic"
,"Ethernet MPLS PW (CW is heuristically detected)"
,MDD_PW_ETH_HEUR
},
{
"mpls pw fr dlci"
,"Frame relay DLCI MPLS PW"
,MDD_MPLS_PW_FR_DLCI
},
{
"mpls pw hdlc no_cw fr_port"
,"HDLC MPLS PW (no CW), FR Port mode"
,MDD_MPLS_PW_HDLC_NOCW_FRPORT
},
{
"mpls pw hdlc no_cw hdlc payload_ppp"
,"HDLC MPLS PW (no CW), HDLC mode, PPP payload"
,MDD_MPLS_PW_HDLC_NOCW_HDLC_PPP
},
{
"mpls pw ethernet cw"
,"Ethernet MPLS PW (with CW)"
,MDD_MPLS_PW_ETH_CW
},
{
"mpls pw ethernet no_cw"
,"Ethernet MPLS PW (no CW, early implementations)"
,MDD_MPLS_PW_ETH_NOCW
},
{
"mpls pw generic cw"
,"Generic MPLS PW (with Generic/Preferred MPLS CW)"
,MDD_MPLS_PW_GENERIC
},
{
"itdm"
,"Internal TDM"
,MDD_ITDM
},
{
"mpls pw atm n_to_one cw"
,pwc_longname_pw_atm_n1_cw
,MDD_MPLS_PW_ATM_N1_CW
},
{
"mpls pw atm n_to_one no_cw"
,pwc_longname_pw_atm_n1_nocw
,MDD_MPLS_PW_ATM_N1_NOCW
},
{
"mpls pw atm one_to_one or aal5_pdu"
,pwc_longname_pw_atm_11_or_aal5_pdu
,MDD_MPLS_PW_ATM_11_OR_AAL5_PDU
},
{
"mpls pw atm aal5_sdu"
,pwc_longname_pw_atm_aal5_sdu
,MDD_MPLS_PW_ATM_AAL5_SDU
},
{
NULL
,NULL
,-1
}
};
/* For RFC6391 - Flow aware transport of pseudowire over a mpls PSN*/
static gboolean mpls_bos_flowlabel = FALSE;
static int hf_mpls_label;
static int hf_mpls_label_special;
static int hf_mpls_exp;
static int hf_mpls_bos;
static int hf_mpls_ttl;
static gint mpls_default_payload = 0;
static int hf_mpls_pw_ach_ver = -1;
static int hf_mpls_pw_ach_res = -1;
static int hf_mpls_pw_ach_channel_type = -1;
static int hf_mpls_pw_mcw_flags = -1;
static int hf_mpls_pw_mcw_length = -1;
static int hf_mpls_pw_mcw_sequence_number = -1;
#if 0 /*not used yet*/
/*
* MPLS PW types
* http://www.iana.org/assignments/pwe3-parameters
*/
static const value_string mpls_pw_types[] = {
{ 0x0001, "Frame Relay DLCI ( Martini Mode )" },
{ 0x0002, "ATM AAL5 SDU VCC transport" },
{ 0x0003, "ATM transparent cell transport" },
{ 0x0004, "Ethernet Tagged Mode" },
{ 0x0005, "Ethernet" },
{ 0x0006, "HDLC" },
{ 0x0007, "PPP" },
{ 0x0008, "SONET/SDH Circuit Emulation Service Over MPLS" },
{ 0x0009, "ATM n-to-one VCC cell transport" },
{ 0x000A, "ATM n-to-one VPC cell transport" },
{ 0x000B, "IP Layer2 Transport" },
{ 0x000C, "ATM one-to-one VCC Cell Mode" },
{ 0x000D, "ATM one-to-one VPC Cell Mode" },
{ 0x000E, "ATM AAL5 PDU VCC transport" },
{ 0x000F, "Frame-Relay Port mode" },
{ 0x0010, "SONET/SDH Circuit Emulation over Packet" },
{ 0x0011, "Structure-agnostic E1 over Packet" },
{ 0x0012, "Structure-agnostic T1 (DS1) over Packet" },
{ 0x0013, "Structure-agnostic E3 over Packet" },
{ 0x0014, "Structure-agnostic T3 (DS3) over Packet" },
{ 0x0015, "CESoPSN basic mode" },
{ 0x0016, "TDMoIP AAL1 Mode" },
{ 0x0017, "CESoPSN TDM with CAS" },
{ 0x0018, "TDMoIP AAL2 Mode" },
{ 0x0019, "Frame Relay DLCI" },
{ 0x001A, "ROHC Transport Header-compressed Packets" },/*[RFC4995][RFC4901]*/
{ 0x001B, "ECRTP Transport Header-compressed Packets" },/*[RFC3545][RFC4901]*/
{ 0x001C, "IPHC Transport Header-compressed Packets" },/*[RFC2507][RFC4901]*/
{ 0x001D, "cRTP Transport Header-compressed Packets" },/*[RFC2508][RFC4901]*/
{ 0x001E, "ATM VP Virtual Trunk" },/*[MFA9]*/
{ 0x001F, "Reserved" },/*[Bryant] 2008-04-17*/
{ 0, NULL }
};
static value_string_ext mpls_pw_types_ext = VALUE_STRING_EXT_INIT(mpls_pw_types);
#endif
/*
* MPLS PW Associated Channel Types
* as per http://www.iana.org/assignments/pwe3-parameters
* and http://tools.ietf.org/html/draft-ietf-pwe3-vccv-bfd-05 clause 3.2
*/
static const value_string mpls_pwac_types[] = {
{ 0x0000, "Reserved"},
{ 0x0001, "Management Communication Channel (MCC)"},
{ 0x0002, "Signaling Communication Channel (SCC)"},
{ 0x0007, "BFD Control, PW-ACH-encapsulated (BFD Without IP/UDP Headers)" },
{ 0x000A, "MPLS Direct Loss Measurement (DLM)"},
{ 0x000B, "MPLS Inferred Loss Measurement (ILM)"},
{ 0x000C, "MPLS Delay Measurement (DM)"},
{ 0x000D, "MPLS Direct Loss and Delay Measurement (DLM+DM)"},
{ 0x000E, "MPLS Inferred Loss and Delay Measurement (ILM+DM)"},
{ 0x0021, "IPv4 packet" },
{ 0x0022, "MPLS-TP CC message"},
{ 0x0023, "MPLS-TP CV message"},
{ 0x0024, "Protection State Coordination Protocol (PSC)"},
{ 0x0025, "On-Demand CV"},
{ 0x0026, "LI"},
{ 0x0057, "IPv6 packet" },
{ 0x0058, "Fault OAM"},
{ 0x7FF8, "Reserved for Experimental Use"},
{ 0x7FF9, "Reserved for Experimental Use"},
{ 0x7FFA, "Reserved for Experimental Use"},
{ 0x7FFB, "Reserved for Experimental Use"},
{ 0x7FFC, "Reserved for Experimental Use"},
{ 0x7FFD, "Reserved for Experimental Use"},
{ 0x7FFE, "Reserved for Experimental Use"},
{ 0x7FFF, "Reserved for Experimental Use"},
{ 0, NULL }
};
static value_string_ext mpls_pwac_types_ext = VALUE_STRING_EXT_INIT(mpls_pwac_types);
static dissector_table_t mpls_subdissector_table;
/*
* Given a 4-byte MPLS label starting at offset "offset", in tvbuff "tvb",
* decode it.
* Return the label in "label", EXP bits in "exp",
* bottom_of_stack in "bos", and TTL in "ttl"
*/
void
decode_mpls_label(tvbuff_t *tvb, int offset,
guint32 *label, guint8 *exp,
guint8 *bos, guint8 *ttl)
{
guint8 octet0 = tvb_get_guint8(tvb, offset+0);
guint8 octet1 = tvb_get_guint8(tvb, offset+1);
guint8 octet2 = tvb_get_guint8(tvb, offset+2);
*label = (octet0 << 12) + (octet1 << 4) + ((octet2 >> 4) & 0xff);
*exp = (octet2 >> 1) & 0x7;
*bos = (octet2 & 0x1);
*ttl = tvb_get_guint8(tvb, offset+3);
}
/*
* FF: PW Associated Channel Header dissection as per RFC 4385.
*/
static void
dissect_pw_ach(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
tvbuff_t *next_tvb;
guint16 channel_type;
if (tvb_reported_length_remaining(tvb, 0) < 4) {
proto_tree_add_text(tree, tvb, 0, -1, "Error processing Message");
return;
}
channel_type = tvb_get_ntohs(tvb, 2);
if (tree) {
proto_tree *mpls_pw_ach_tree;
proto_item *ti;
guint16 res;
ti = proto_tree_add_item(tree, proto_pw_ach, tvb, 0, 4, ENC_NA);
mpls_pw_ach_tree = proto_item_add_subtree(ti, ett_mpls_pw_ach);
proto_tree_add_item(mpls_pw_ach_tree, hf_mpls_pw_ach_ver,
tvb, 0, 1, ENC_BIG_ENDIAN);
res = tvb_get_guint8(tvb, 1);
ti = proto_tree_add_uint(mpls_pw_ach_tree, hf_mpls_pw_ach_res,
tvb, 1, 1, res);
if (res != 0)
proto_tree_add_text(mpls_pw_ach_tree, tvb, 1, 1,
"Error: this byte is reserved and must be 0");
else
PROTO_ITEM_SET_HIDDEN(ti);
proto_tree_add_uint_format_value(mpls_pw_ach_tree, hf_mpls_pw_ach_channel_type,
tvb, 2, 2, channel_type,
"%s (0x%04x)",
val_to_str_ext_const(channel_type, &mpls_pwac_types_ext, "Unknown"),
channel_type);
} /* if (tree) */
next_tvb = tvb_new_subset_remaining(tvb, 4);
switch (channel_type) {
case ACH_TYPE_BFD_CC:
call_dissector(dissector_bfd, next_tvb, pinfo, tree); /* bfd_control() */
break;
case ACH_TYPE_BFD_CV:
call_dissector(dissector_bfd, next_tvb, pinfo, tree); /* bfd_control() */
dissect_bfd_mep(next_tvb, tree, 0);
break;
case ACH_TYPE_ONDEMAND_CV:
dissect_mpls_echo(next_tvb, pinfo, tree, NULL);
break;
case 0x21: /* IPv4, RFC4385 clause 6. */
call_dissector(dissector_ip, next_tvb, pinfo, tree);
break;
case 0x7: /* PWACH-encapsulated BFD, RFC 5885 */
call_dissector(dissector_bfd, next_tvb, pinfo, tree);
break;
case 0x57: /* IPv6, RFC4385 clause 6. */
call_dissector(dissector_ipv6, next_tvb, pinfo, tree);
break;
case 0x000A: /* FF: MPLS PM, RFC 6374, DLM */
call_dissector(dissector_mpls_pm_dlm, next_tvb, pinfo, tree);
break;
case 0x000B: /* FF: MPLS PM, RFC 6374, ILM */
call_dissector(dissector_mpls_pm_ilm, next_tvb, pinfo, tree);
break;
case 0x000C: /* FF: MPLS PM, RFC 6374, DM */
call_dissector(dissector_mpls_pm_dm, next_tvb, pinfo, tree);
break;
case 0x000D: /* FF: MPLS PM, RFC 6374, DLM+DM */
call_dissector(dissector_mpls_pm_dlm_dm, next_tvb, pinfo, tree);
break;
case 0x000E: /* FF: MPLS PM, RFC 6374, ILM+DM */
call_dissector(dissector_mpls_pm_ilm_dm, next_tvb, pinfo, tree);
break;
case 0x0024: /* FF: PSC, RFC 6378 */
call_dissector(dissector_mpls_psc, next_tvb, pinfo, tree);
break;
case 0x0026: /* KM: MPLSTP LOCK, RFC 6435 */
call_dissector(dissector_mplstp_lock, next_tvb, pinfo, tree);
break;
case 0x0058: /* KM: MPLSTP FM, RFC 6427 */
call_dissector(dissector_mplstp_fm, next_tvb, pinfo, tree);
break;
default:
call_dissector(dissector_data, next_tvb, pinfo, tree);
break;
}
}
gboolean
dissect_try_cw_first_nibble( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
{
guint8 nibble;
nibble = (tvb_get_guint8(tvb, 0 ) >> 4) & 0x0F;
switch ( nibble )
{
case 6:
call_dissector(dissector_ipv6, tvb, pinfo, tree);
return TRUE;
case 4:
call_dissector(dissector_ip, tvb, pinfo, tree);
return TRUE;
case 1:
dissect_pw_ach(tvb, pinfo, tree );
return TRUE;
default:
break;
}
return FALSE;
}
/*
* FF: Generic/Preferred PW MPLS Control Word dissection as per RFC 4385.
*/
static void
dissect_pw_mcw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
tvbuff_t *next_tvb;
if (tvb_reported_length_remaining(tvb, 0) < 4) {
proto_tree_add_text(tree, tvb, 0, -1, "Error processing Message");
return;
}
if ( dissect_try_cw_first_nibble( tvb, pinfo, tree ))
return;
if (tree) {
proto_tree *mpls_pw_mcw_tree;
proto_item *ti;
ti = proto_tree_add_item(tree, proto_pw_mcw, tvb, 0, 4, ENC_NA);
mpls_pw_mcw_tree = proto_item_add_subtree(ti, ett_mpls_pw_mcw);
proto_tree_add_item(mpls_pw_mcw_tree, hf_mpls_pw_mcw_flags,
tvb, 0, 2, ENC_BIG_ENDIAN);
/* bits 4 to 7 and FRG bits are displayed together */
proto_tree_add_item(mpls_pw_mcw_tree, hf_mpls_pw_mcw_length,
tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(mpls_pw_mcw_tree, hf_mpls_pw_mcw_sequence_number,
tvb, 2, 2, ENC_BIG_ENDIAN);
}
next_tvb = tvb_new_subset_remaining(tvb, 4);
call_dissector(dissector_data, next_tvb, pinfo, tree);
}
static void
dissect_mpls(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
int offset = 0;
guint32 label = MPLS_LABEL_INVALID;
guint8 exp;
guint8 bos;
guint8 ttl;
tvbuff_t *next_tvb;
gboolean found;
guint8 first_nibble;
struct mplsinfo mplsinfo;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MPLS");
col_set_str(pinfo->cinfo, COL_INFO, "MPLS Label Switched Packet");
/* Start Decoding Here. */
while (tvb_reported_length_remaining(tvb, offset) > 0) {
decode_mpls_label(tvb, offset, &label, &exp, &bos, &ttl);
/*
* FF: export (last shim in stack) info to subdissectors and
* update pinfo
*/
mplsinfo.label = pinfo->mpls_label = label;
mplsinfo.exp = exp;
mplsinfo.bos = bos;
mplsinfo.ttl = ttl;
pinfo->private_data = &mplsinfo;
if (tree) {
proto_item *ti;
proto_tree *mpls_tree;
ti = proto_tree_add_item(tree, proto_mpls, tvb, offset, 4, ENC_NA);
mpls_tree = proto_item_add_subtree(ti, ett_mpls);
if (mpls_bos_flowlabel) {
proto_item_append_text(ti, ", Label: %u (Flow Label)", label);
} else {
proto_item_append_text(ti, ", Label: %u", label);
}
if (label <= MPLS_LABEL_MAX_RESERVED){
proto_tree_add_item(mpls_tree, hf_mpls_label_special, tvb,
offset, 4, ENC_BIG_ENDIAN);
proto_item_append_text(ti, " (%s)",
val_to_str_const(label, special_labels, "Reserved - Unknown"));
} else {
proto_tree_add_item(mpls_tree, hf_mpls_label, tvb, offset, 4,
ENC_BIG_ENDIAN);
}
proto_tree_add_item(mpls_tree, hf_mpls_exp, tvb, offset, 4,
ENC_BIG_ENDIAN);
proto_item_append_text(ti, ", Exp: %u", exp);
proto_tree_add_item(mpls_tree, hf_mpls_bos , tvb, offset, 4,
ENC_BIG_ENDIAN);
proto_item_append_text(ti, ", S: %u", bos);
proto_tree_add_item(mpls_tree, hf_mpls_ttl, tvb, offset, 4,
ENC_BIG_ENDIAN);
proto_item_append_text(ti, ", TTL: %u", ttl);
}
offset += 4;
if ((label == MPLS_LABEL_GACH) && !bos) {
proto_tree_add_text(tree, tvb, 0, -1, "Invalid Label");
}
if ((label == MPLS_LABEL_GACH) && bos) {
g_strlcpy(PW_ACH, "Generic Associated Channel Header",50);
next_tvb = tvb_new_subset_remaining(tvb, offset);
dissect_pw_ach( next_tvb, pinfo, tree );
return;
}
else
g_strlcpy(PW_ACH, "PW Associated Channel Header",50);
if (bos)
break;
}
first_nibble = (tvb_get_guint8(tvb, offset) >> 4) & 0x0F;
next_tvb = tvb_new_subset_remaining(tvb, offset);
/* 1) explicit label-to-dissector binding ? */
found = dissector_try_uint(mpls_subdissector_table, label,
next_tvb, pinfo, tree);
if (found)
return;
/* 2) use the 1st nibble logic (see BCP 4928, RFC 4385 and 5586) */
if (first_nibble == 4) {
call_dissector(dissector_ip, next_tvb, pinfo, tree);
return;
} else if (first_nibble == 6) {
call_dissector(dissector_ipv6, next_tvb, pinfo, tree);
return;
} else if (first_nibble == 1) {
dissect_pw_ach(next_tvb, pinfo, tree);
return;
} else if (first_nibble == 0) {
/*
* FF: it should be a PW with a CW but... it's not
* guaranteed (e.g. an Ethernet PW w/o CW and a DA MAC
* address like 00:xx:xx:xx:xx:xx). So, let the user and
* eventually any further PW heuristics decide.
*/
}
/* 3) use the mpls_default_payload info from user */
switch (mpls_default_payload) {
case MDD_PW_SATOP:
call_dissector(dissector_pw_satop, next_tvb, pinfo, tree);
break;
case MDD_PW_CESOPSN:
call_dissector(dissector_pw_cesopsn, next_tvb, pinfo, tree);
break;
case MDD_PW_ETH_HEUR:
call_dissector(dissector_pw_eth_heuristic, next_tvb, pinfo, tree);
break;
case MDD_MPLS_PW_FR_DLCI:
call_dissector(dissector_pw_fr, next_tvb, pinfo, tree);
break;
case MDD_MPLS_PW_HDLC_NOCW_FRPORT:
call_dissector(dissector_pw_hdlc_nocw_fr, next_tvb, pinfo, tree);
break;
case MDD_MPLS_PW_HDLC_NOCW_HDLC_PPP:
call_dissector(dissector_pw_hdlc_nocw_hdlc_ppp,next_tvb, pinfo, tree);
break;
case MDD_MPLS_PW_ETH_CW:
call_dissector(dissector_pw_eth_cw, next_tvb, pinfo, tree);
break;
case MDD_MPLS_PW_ETH_NOCW:
call_dissector(dissector_pw_eth_nocw, next_tvb, pinfo, tree);
break;
case MDD_ITDM:
call_dissector(dissector_itdm, next_tvb, pinfo, tree);
break;
case MDD_MPLS_PW_ATM_N1_CW:
call_dissector(dissector_mpls_pw_atm_n1_cw, next_tvb, pinfo, tree);
break;
case MDD_MPLS_PW_ATM_N1_NOCW:
call_dissector(dissector_mpls_pw_atm_n1_nocw, next_tvb, pinfo, tree);
break;
case MDD_MPLS_PW_ATM_11_OR_AAL5_PDU:
call_dissector(dissector_mpls_pw_atm_11_aal5pdu, next_tvb, pinfo, tree);
break;
case MDD_MPLS_PW_ATM_AAL5_SDU:
call_dissector(dissector_mpls_pw_atm_aal5_sdu, next_tvb, pinfo, tree);
break;
default: /* fallthrough */
case MDD_MPLS_PW_GENERIC:
dissect_pw_mcw(next_tvb, pinfo, tree);
break;
}
}
void
proto_register_mpls(void)
{
static hf_register_info mplsf_info[] = {
/* MPLS header fields */
{&hf_mpls_label,
{"MPLS Label", "mpls.label",
FT_UINT32, BASE_DEC, NULL, 0xFFFFF000,
NULL, HFILL }
},
{&hf_mpls_label_special,
{"MPLS Label", "mpls.label",
FT_UINT32, BASE_DEC, VALS(special_labels), 0xFFFFF000,
NULL, HFILL }
},
{&hf_mpls_exp,
{"MPLS Experimental Bits", "mpls.exp",
FT_UINT32, BASE_DEC, NULL, 0x00000E00,
NULL, HFILL }
},
{&hf_mpls_bos,
{"MPLS Bottom Of Label Stack", "mpls.bottom",
FT_UINT32, BASE_DEC, NULL, 0x00000100,
NULL, HFILL }
},
{&hf_mpls_ttl,
{"MPLS TTL", "mpls.ttl",
FT_UINT32, BASE_DEC, NULL, 0x0000000FF,
NULL, HFILL }
},
/* PW Associated Channel Header fields */
{&hf_mpls_pw_ach_ver,
{"Channel Version", "pwach.ver",
FT_UINT8, BASE_DEC, NULL, 0x0F,
"PW Associated Channel Version", HFILL }
},
{&hf_mpls_pw_ach_res,
{"Reserved", "pwach.res",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{&hf_mpls_pw_ach_channel_type,
{"Channel Type", "pwach.channel_type",
FT_UINT16, BASE_HEX, NULL, 0x0,
"PW Associated Channel Type", HFILL }
},
/* Generic/Preferred PW MPLS Control Word fields */
{&hf_mpls_pw_mcw_flags,
{"Flags", "pwmcw.flags",
FT_UINT8, BASE_HEX, NULL, 0x0FC0,
"Generic/Preferred PW MPLS Control Word Flags", HFILL }
},
{&hf_mpls_pw_mcw_length,
{"Length", "pwmcw.length",
FT_UINT8, BASE_DEC, NULL, 0x3F,
"Generic/Preferred PW MPLS Control Word Length", HFILL }
},
{&hf_mpls_pw_mcw_sequence_number,
{"Sequence Number", "pwmcw.sequence_number",
FT_UINT16, BASE_DEC, NULL, 0x0,
"Generic/Preferred PW MPLS Control Word Sequence Number", HFILL }
},
};
static gint *ett[] = {
&ett_mpls,
&ett_mpls_pw_ach,
&ett_mpls_pw_mcw,
};
module_t * module_mpls;
/* FF: mpls subdissector table is indexed by label */
mpls_subdissector_table = register_dissector_table("mpls.label",
"MPLS protocol",
FT_UINT32, BASE_DEC);
proto_mpls = proto_register_protocol("MultiProtocol Label Switching Header",
"MPLS", "mpls");
proto_pw_ach = proto_register_protocol(PW_ACH,
"PW Associated Channel", "pwach");
proto_pw_mcw = proto_register_protocol("PW MPLS Control Word (generic/preferred)",
"Generic PW (with CW)", "pwmcw");
proto_register_field_array(proto_mpls, mplsf_info, array_length(mplsf_info));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("mpls", dissect_mpls, proto_mpls);
register_dissector("mplspwcw", dissect_pw_mcw, proto_pw_mcw );
module_mpls = prefs_register_protocol( proto_mpls, NULL );
prefs_register_enum_preference(module_mpls,
"mplspref.payload",
"Default decoder for MPLS payload",
"Default decoder for MPLS payload",
&mpls_default_payload,
mpls_default_payload_defs,
FALSE );
/* RFC6391: Flow aware transport of pseudowire*/
prefs_register_bool_preference(module_mpls,
"flowlabel_in_mpls_header",
"Assume bottom of stack label as Flow label",
"Lowest label is used to segregate flows inside a pseudowire",
&mpls_bos_flowlabel);
}
void
proto_reg_handoff_mpls(void)
{
dissector_handle_t mpls_handle;
mpls_handle = find_dissector("mpls");
dissector_add_uint("ethertype", ETHERTYPE_MPLS, mpls_handle);
dissector_add_uint("ethertype", ETHERTYPE_MPLS_MULTI, mpls_handle);
dissector_add_uint("chdlctype", ETHERTYPE_MPLS, mpls_handle);
dissector_add_uint("chdlctype", ETHERTYPE_MPLS_MULTI, mpls_handle);
dissector_add_uint("gre.proto", ETHERTYPE_MPLS, mpls_handle);
dissector_add_uint("gre.proto", ETHERTYPE_MPLS_MULTI, mpls_handle);
dissector_add_uint("ip.proto", IP_PROTO_MPLS_IN_IP, mpls_handle);
mpls_handle = find_dissector("mplspwcw");
dissector_add_uint( "mpls.label", MPLS_LABEL_INVALID, mpls_handle );
dissector_data = find_dissector("data");
dissector_ipv6 = find_dissector("ipv6");
dissector_ip = find_dissector("ip");
dissector_bfd = find_dissector("bfd");
dissector_mpls_pm_dlm = find_dissector("mpls_pm_dlm");
dissector_mpls_pm_ilm = find_dissector("mpls_pm_ilm");
dissector_mpls_pm_dm = find_dissector("mpls_pm_dm");
dissector_mpls_pm_dlm_dm = find_dissector("mpls_pm_dlm_dm");
dissector_mpls_pm_ilm_dm = find_dissector("mpls_pm_ilm_dm");
dissector_mpls_psc = find_dissector("mpls_psc");
dissector_mplstp_lock = find_dissector("mplstp_lock");
dissector_mplstp_fm = find_dissector("mplstp_fm");
dissector_pw_eth_heuristic = find_dissector("pw_eth_heuristic");
dissector_pw_fr = find_dissector("pw_fr");
dissector_pw_hdlc_nocw_fr = find_dissector("pw_hdlc_nocw_fr");
dissector_pw_eth_cw = find_dissector("pw_eth_cw");
dissector_pw_eth_nocw = find_dissector("pw_eth_nocw");
dissector_pw_satop = find_dissector("pw_satop_mpls");
dissector_itdm = find_dissector("itdm");
dissector_mpls_pw_atm_n1_cw = find_dissector("mpls_pw_atm_n1_cw");
dissector_mpls_pw_atm_n1_nocw = find_dissector("mpls_pw_atm_n1_nocw");
dissector_mpls_pw_atm_11_aal5pdu= find_dissector("mpls_pw_atm_11_or_aal5_pdu");
dissector_mpls_pw_atm_aal5_sdu = find_dissector("mpls_pw_atm_aal5_sdu");
dissector_pw_cesopsn = find_dissector("pw_cesopsn_mpls");
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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