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wireshark/epan/dissectors/packet-mpls.c
John Thacker ee6519bca6 L2TP: Use the IANA assigned PW types for Decode As 
Instead of registering subdissectors to arbitrary Wireshark
assigned numbers, register them to the actual pseudowire type
number assigned by IANA and present in the Pseudowire Type AVP.
Half of the previously registered types were never used, because
the dissector table could not be called with their Wireshark
internal number.

This makes it easier to add dissectors to support currently
unsupported but assigned types, and also makes it more intuitive
to use Decode As when the PW Type AVP is not present. Previously,
the dissector for the "default" type of CHDLC had to be changed to
a different subdissector.
2022-08-10 21:23:38 -04:00

751 lines
28 KiB
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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
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/expert.h>
#include <epan/ppptypes.h>
#include <epan/etypes.h>
#include <epan/prefs.h>
#include <epan/ipproto.h>
#include <epan/decode_as.h>
#include <epan/proto_data.h>
#include "packet-ppp.h"
#include "packet-mpls.h"
#include "packet-pw-common.h"
#include "packet-bfd.h"
#include "packet-juniper.h"
#include "packet-sflow.h"
#include "packet-l2tp.h"
#include "packet-vxlan.h"
#include "packet-nsh.h"
void proto_register_mpls(void);
void proto_reg_handoff_mpls(void);
static gint proto_mpls = -1;
static gint proto_pw_ach = -1;
static gint proto_pw_ach_mcc = -1;
static gint proto_pw_mcw = -1;
static gint ett_mpls = -1;
static gint ett_mpls_pw_ach = -1;
static gint ett_mpls_pw_ach_mcc = -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)"},
{MPLS_LABEL_ELI, "Entropy Label Indicator (ELI)"},
{0, NULL }
};
static dissector_table_t pw_ach_subdissector_table;
static dissector_table_t pw_ach_mcc_subdissector_table;
static dissector_handle_t dissector_ipv6;
static dissector_handle_t dissector_ip;
static dissector_handle_t dissector_pw_ach;
static dissector_handle_t dissector_pw_eth_heuristic;
static dissector_handle_t dissector_pw_ach_mcc;
/* For RFC6391 - Flow aware transport of pseudowire over a mpls PSN*/
static gboolean mpls_bos_flowlabel = FALSE;
static int hf_mpls_label = -1;
static int hf_mpls_label_special = -1;
static int hf_mpls_exp = -1;
static int hf_mpls_bos = -1;
static int hf_mpls_ttl = -1;
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_ach_mcc_proto = -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;
static expert_field ei_mpls_pw_ach_error_processing_message = EI_INIT;
static expert_field ei_mpls_pw_ach_res = EI_INIT;
static expert_field ei_mpls_pw_mcw_error_processing_message = EI_INIT;
static expert_field ei_mpls_invalid_label = EI_INIT;
static dissector_handle_t mpls_handle;
static dissector_handle_t mpls_pwcw_handle;
static dissector_handle_t mpls_mcc_handle;
#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 https://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"},
{ 0x0027, "Pseudo-Wire OAM"},
{ 0x0028, "MAC Withdraw OAM Msg"},
{ 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"},
{ 0x8902, "MPLS-TP OAM"},
{ 0, NULL }
};
static value_string_ext mpls_pwac_types_ext = VALUE_STRING_EXT_INIT(mpls_pwac_types);
static dissector_table_t mpls_subdissector_table;
static void mpls_prompt(packet_info *pinfo, gchar* result)
{
snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "Data after label %u as",
GPOINTER_TO_UINT(p_get_proto_data(pinfo->pool, pinfo, proto_mpls, 0)));
}
static gpointer mpls_value(packet_info *pinfo)
{
return p_get_proto_data(pinfo->pool, pinfo, proto_mpls, 0);
}
static void pw_ach_prompt(packet_info *pinfo, gchar* result)
{
snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "Channel type 0x%x as",
GPOINTER_TO_UINT(p_get_proto_data(pinfo->pool, pinfo, proto_pw_ach, 0)));
}
static gpointer pw_ach_value(packet_info *pinfo)
{
return p_get_proto_data(pinfo->pool, pinfo, proto_pw_ach, 0);
}
/*
* 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);
}
/*
* PW Associated Channel Header Management Communication
* Network (MCN) dissection as per RFC 5718.
*/
static int
dissect_pw_ach_mcc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
tvbuff_t *next_tvb;
proto_tree *mpls_pw_ach_mcc_tree;
proto_item *ti;
guint32 pid;
ti = proto_tree_add_item(tree, proto_pw_ach_mcc, tvb, 0,2, ENC_NA);
mpls_pw_ach_mcc_tree = proto_item_add_subtree(ti, ett_mpls_pw_ach_mcc);
proto_tree_add_item_ret_uint(mpls_pw_ach_mcc_tree, hf_mpls_pw_ach_mcc_proto,tvb, 0, 2, ENC_BIG_ENDIAN, &pid);
next_tvb = tvb_new_subset_remaining(tvb, 2);
if (!dissector_try_uint(pw_ach_mcc_subdissector_table, pid, next_tvb, pinfo, tree))
{
call_data_dissector(next_tvb, pinfo, tree);
}
return tvb_captured_length(tvb);
}
/*
* FF: PW Associated Channel Header dissection as per RFC 4385.
*/
static int
dissect_pw_ach(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
tvbuff_t *next_tvb;
guint channel_type;
if (tvb_reported_length_remaining(tvb, 0) < 4) {
proto_tree_add_expert(tree, pinfo, &ei_mpls_pw_ach_error_processing_message, tvb, 0, -1);
return tvb_captured_length(tvb);
}
channel_type = tvb_get_ntohs(tvb, 2);
p_add_proto_data(pinfo->pool, pinfo, proto_pw_ach, 0, GUINT_TO_POINTER(channel_type));
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)
expert_add_info(pinfo, ti, &ei_mpls_pw_ach_res);
proto_tree_add_item(mpls_pw_ach_tree, hf_mpls_pw_ach_channel_type,
tvb, 2, 2, ENC_BIG_ENDIAN);
} /* if (tree) */
next_tvb = tvb_new_subset_remaining(tvb, 4);
if (!dissector_try_uint(pw_ach_subdissector_table, channel_type, next_tvb, pinfo, tree))
{
call_data_dissector(next_tvb, pinfo, tree);
}
if (channel_type == PW_ACH_TYPE_BFD_CV)
{
/* The BFD dissector has already been called, this is called in addition
XXX - Perhaps a new dissector function that combines both is preferred.*/
dissect_bfd_mep(next_tvb, tree, 0);
}
return tvb_captured_length(tvb);
}
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:
/*
* XXX - this could be from an pseudo-wire without a control
* word, with the packet's first nibble being 6.
*/
call_dissector(dissector_ipv6, tvb, pinfo, tree);
return TRUE;
case 4:
/*
* XXX - this could be from an pseudo-wire without a control
* word, with the packet's first nibble being 4.
*/
call_dissector(dissector_ip, tvb, pinfo, tree);
return TRUE;
case 1:
/*
* XXX - this could be from an pseudo-wire without a control
* word, with the packet's first nibble being 1.
*/
call_dissector(dissector_pw_ach, tvb, pinfo, tree );
return TRUE;
default:
break;
}
return FALSE;
}
/*
* FF: Generic/Preferred PW MPLS Control Word dissection as per RFC 4385.
*/
static int
dissect_pw_mcw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
tvbuff_t *next_tvb;
if (tvb_reported_length_remaining(tvb, 0) < 4) {
proto_tree_add_expert(tree, pinfo, &ei_mpls_pw_mcw_error_processing_message, tvb, 0, -1);
return tvb_captured_length(tvb);
}
if ( dissect_try_cw_first_nibble( tvb, pinfo, tree ))
return tvb_captured_length(tvb);
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_data_dissector(next_tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
static int
dissect_mpls(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
int offset = 0;
guint32 label = MPLS_LABEL_INVALID;
guint8 exp;
guint8 bos;
guint8 ttl;
tvbuff_t *next_tvb;
int 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");
/* Ensure structure is initialized */
memset(&mplsinfo, 0, sizeof(struct mplsinfo));
/* 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 = label;
p_add_proto_data(pinfo->pool, pinfo, proto_mpls, 0, GUINT_TO_POINTER(label));
mplsinfo.exp = exp;
mplsinfo.bos = bos;
mplsinfo.ttl = ttl;
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 && bos) {
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_expert(tree, pinfo, &ei_mpls_invalid_label, tvb, 0, -1);
}
if ((label == MPLS_LABEL_GACH) && bos) {
(void) g_strlcpy(PW_ACH, "Generic Associated Channel Header",50);
next_tvb = tvb_new_subset_remaining(tvb, offset);
call_dissector(dissector_pw_ach, next_tvb, pinfo, tree );
return tvb_captured_length(tvb);
}
else
(void) 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);
/*
* Is there an explicit label-to-dissector binding?
* If so, use it.
*/
found = dissector_try_uint_new(mpls_subdissector_table, label,
next_tvb, pinfo, tree, FALSE, &mplsinfo);
if (found) {
/* Yes, there is. */
return tvb_captured_length(tvb);
}
/*
* No, there isn't, so use the 1st nibble logic (see BCP 4928,
* RFC 4385 and 5586).
*/
switch(first_nibble) {
case 4:
/*
* XXX - this could be from an Ethernet pseudo-wire without a
* control word, with the MAC address's first nibble being 4.
*/
call_dissector(dissector_ip, next_tvb, pinfo, tree);
/* IP dissector may reduce the length of the tvb.
We need to do the same, so that ethernet trailer is detected. */
set_actual_length(tvb, offset+tvb_reported_length(next_tvb));
break;
case 6:
/*
* XXX - this could be from an Ethernet pseudo-wire without a
* control word, with the MAC address's first nibble being 6.
*/
call_dissector(dissector_ipv6, next_tvb, pinfo, tree);
/* IPv6 dissector may reduce the length of the tvb.
We need to do the same, so that ethernet trailer is detected. */
set_actual_length(tvb, offset+tvb_reported_length(next_tvb));
break;
case 1:
/*
* XXX - this could be from an Ethernet pseudo-wire without a
* control word, with the MAC address's first nibble being 1.
*/
call_dissector(dissector_pw_ach, next_tvb, pinfo, tree);
break;
case 0:
/*
* If this is an Ethernet pseudo-wire, this could either be
* Ethernet without a control word and with the first nibble
* of the destination MAC address being 0 or it could be
* Ethernet with a control word. Let the "pw_eth_heuristic"
* dissector try to figure it out.
*/
call_dissector(dissector_pw_eth_heuristic, next_tvb, pinfo, tree);
break;
default:
call_data_dissector(next_tvb, pinfo, tree);
break;
}
return tvb_captured_length(tvb);
}
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_HEX, NULL, 0xFFFFF000,
NULL, HFILL }
},
{&hf_mpls_label_special,
{"MPLS Label", "mpls.label",
FT_UINT32, BASE_DEC_HEX, 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|BASE_EXT_STRING, &mpls_pwac_types_ext, 0x0,
"PW Associated Channel Type", HFILL }
},
/* Generic/Preferred PW MPLS MCC Control Word fields */
{&hf_mpls_pw_ach_mcc_proto,
{"Protocol Id", "mcc.proto",
FT_UINT16, BASE_HEX|BASE_EXT_STRING, &mpls_pwac_types_ext, 0x0,
"MCC Protocol", HFILL }
},
/* Generic/Preferred PW MPLS Control Word fields */
{&hf_mpls_pw_mcw_flags,
{"Flags", "pwmcw.flags",
FT_UINT16, 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_ach_mcc,
&ett_mpls_pw_mcw,
};
static ei_register_info ei[] = {
{ &ei_mpls_pw_ach_error_processing_message, { "pwach.error_processing_message", PI_MALFORMED, PI_ERROR, "Error processing Message", EXPFILL }},
{ &ei_mpls_pw_ach_res, { "pwach.res.not_zero", PI_PROTOCOL, PI_WARN, "Error: this byte is reserved and must be 0", EXPFILL }},
{ &ei_mpls_pw_mcw_error_processing_message, { "pwmcw.error_processing_message", PI_MALFORMED, PI_ERROR, "Error processing Message", EXPFILL }},
{ &ei_mpls_invalid_label, { "mpls.invalid_label", PI_PROTOCOL, PI_WARN, "Invalid Label", EXPFILL }},
};
/* Decode As handling */
static build_valid_func mpls_da_build_value[1] = {mpls_value};
static decode_as_value_t mpls_da_values = {mpls_prompt, 1, mpls_da_build_value};
static decode_as_t mpls_da = {"mpls", "mpls.label", 1, 0, &mpls_da_values, NULL, NULL,
decode_as_default_populate_list, decode_as_default_reset, decode_as_default_change, NULL};
static build_valid_func pw_ach_da_build_value[1] = {pw_ach_value};
static decode_as_value_t pw_ach_da_values = {pw_ach_prompt, 1, pw_ach_da_build_value};
static decode_as_t pw_ach_da = {"pwach", "pwach.channel_type", 1, 0, &pw_ach_da_values, NULL, NULL,
decode_as_default_populate_list, decode_as_default_reset, decode_as_default_change, NULL};
expert_module_t* expert_mpls;
module_t * module_mpls;
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_pw_ach_mcc = proto_register_protocol("Management Communication Channel (MCC)",
"PW Associated Management Communication Channel", "mcc");
proto_register_field_array(proto_mpls, mplsf_info, array_length(mplsf_info));
proto_register_subtree_array(ett, array_length(ett));
expert_mpls = expert_register_protocol(proto_mpls);
expert_register_field_array(expert_mpls, ei, array_length(ei));
mpls_handle = register_dissector("mpls", dissect_mpls, proto_mpls);
mpls_mcc_handle = register_dissector("mplsmcc", dissect_pw_ach_mcc,proto_pw_ach_mcc);
mpls_pwcw_handle = register_dissector("mplspwcw", dissect_pw_mcw, proto_pw_mcw );
/* FF: mpls subdissector table is indexed by label */
mpls_subdissector_table = register_dissector_table("mpls.label",
"MPLS protocol",
proto_mpls, FT_UINT32, BASE_DEC);
pw_ach_subdissector_table = register_dissector_table("pwach.channel_type", "PW Associated Channel Type", proto_pw_ach, FT_UINT16, BASE_HEX);
pw_ach_mcc_subdissector_table = register_dissector_table("mcc.proto", "PW Associated Management Communication Channel Protocol", proto_pw_ach_mcc, FT_UINT16, BASE_HEX);
module_mpls = prefs_register_protocol( proto_mpls, NULL );
prefs_register_obsolete_preference(module_mpls, "mplspref.payload");
/* 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);
register_decode_as(&mpls_da);
register_decode_as(&pw_ach_da);
}
void
proto_reg_handoff_mpls(void)
{
dissector_add_uint("ethertype", ETHERTYPE_MPLS, mpls_handle);
dissector_add_uint("ethertype", ETHERTYPE_MPLS_MULTI, mpls_handle);
dissector_add_uint("ppp.protocol", PPP_MPLS_UNI, mpls_handle);
dissector_add_uint("ppp.protocol", PPP_MPLS_MULTI, mpls_handle);
dissector_add_uint("chdlc.protocol", ETHERTYPE_MPLS, mpls_handle);
dissector_add_uint("chdlc.protocol", 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);
dissector_add_uint("juniper.proto", JUNIPER_PROTO_MPLS, mpls_handle);
dissector_add_uint("juniper.proto", JUNIPER_PROTO_IP_MPLS, mpls_handle);
dissector_add_uint("juniper.proto", JUNIPER_PROTO_IP6_MPLS, mpls_handle);
dissector_add_uint("juniper.proto", JUNIPER_PROTO_CLNP_MPLS, mpls_handle);
dissector_add_for_decode_as("pwach.channel_type", mpls_handle);
dissector_add_uint("sflow_245.header_protocol", SFLOW_245_HEADER_MPLS, mpls_handle);
dissector_add_for_decode_as("l2tp.pw_type", mpls_handle);
dissector_add_uint_with_preference("udp.port", UDP_PORT_MPLS_OVER_UDP, mpls_handle);
dissector_add_uint("vxlan.next_proto", VXLAN_MPLS, mpls_handle);
dissector_add_uint("nsh.next_proto", NSH_MPLS, mpls_handle);
dissector_add_uint( "mpls.label", MPLS_LABEL_INVALID, mpls_pwcw_handle);
dissector_add_uint("pwach.channel_type", PW_ACH_TYPE_MCC, mpls_mcc_handle);
dissector_ipv6 = find_dissector_add_dependency("ipv6", proto_pw_mcw );
dissector_ip = find_dissector_add_dependency("ip", proto_pw_mcw );
dissector_pw_eth_heuristic = find_dissector_add_dependency("pw_eth_heuristic", proto_pw_mcw);
dissector_pw_ach = create_dissector_handle(dissect_pw_ach, proto_pw_ach );
dissector_pw_ach_mcc = create_dissector_handle(dissect_pw_ach_mcc, proto_pw_ach_mcc );
}
/*
* 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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