d75de9f755
Change-Id: Ib6f44e0f1d3d8c76d2b6e6c778af8c243af4389c Reviewed-on: https://code.wireshark.org/review/16543 Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com> Petri-Dish: Pascal Quantin <pascal.quantin@gmail.com> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Anders Broman <a.broman58@gmail.com>
388 lines
9.6 KiB
C
388 lines
9.6 KiB
C
/*Routines for Network Service Header
|
|
*draft-ietf-sfc-nsh-01
|
|
*Author: Chidambaram Arunachalam <carunach@cisco.com>
|
|
*Copyright 2016, ciscoSystems Inc.
|
|
*
|
|
*
|
|
*Wireshark - Network traffic analyzer
|
|
*By Gerald Combs <gerald@wireshark.org>
|
|
*Copyright 1998 Gerald Combs
|
|
*
|
|
*(c) Copyright 2016, Sumit Kumar Jha <sjha3@ncsu.edu>
|
|
*Support for VXLAN GPE encapsulation
|
|
*
|
|
*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/expert.h>
|
|
#include <epan/ppptypes.h>
|
|
#include <epan/etypes.h>
|
|
#include <epan/prefs.h>
|
|
#include <epan/ipproto.h>
|
|
#include <epan/decode_as.h>
|
|
#include "packet-vxlan.h"
|
|
|
|
#define MD_TYPE_1 1
|
|
#define MD_TYPE_2 2
|
|
|
|
/* Prototypes */
|
|
void proto_reg_handoff_nsh(void);
|
|
void proto_register_nsh(void);
|
|
|
|
/*Network Service Header (NSH) Next Protocol field values */
|
|
|
|
enum {
|
|
NSH_IPV4 = 1,
|
|
NSH_IPV6,
|
|
NSH_ETHERNET,
|
|
NSH_EXPERIMENTAL
|
|
};
|
|
|
|
static const value_string nsh_next_protocols[] = {
|
|
{ NSH_IPV4, "IPv4" },
|
|
{ NSH_IPV6, "IPv6" },
|
|
{ NSH_ETHERNET, "Ethernet" },
|
|
{ NSH_EXPERIMENTAL, "Experimental" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
|
|
static int proto_nsh = -1;
|
|
static int hf_nsh_version = -1;
|
|
static int hf_nsh_oam = -1;
|
|
static int hf_nsh_critical_metadata = -1;
|
|
static int hf_nsh_reservedbits = -1;
|
|
static int hf_nsh_length = -1;
|
|
static int hf_nsh_md_type = -1;
|
|
static int hf_nsh_next_proto = -1;
|
|
static int hf_nsh_service_pathID = -1;
|
|
static int hf_nsh_service_index = -1;
|
|
static int hf_nsh_context_header = -1;
|
|
static int hf_nsh_metadata_class = -1;
|
|
static int hf_nsh_metadata_type = -1;
|
|
static int hf_nsh_metadata_reservedbits = -1;
|
|
static int hf_nsh_metadata_length = -1;
|
|
static int hf_nsh_metadata = -1;
|
|
|
|
static gint ett_nsh = -1;
|
|
static dissector_handle_t dissector_ipv6;
|
|
static dissector_handle_t dissector_ip;
|
|
static dissector_handle_t dissector_eth;
|
|
|
|
/*
|
|
*Dissect Fixed Length Context headers
|
|
*
|
|
*/
|
|
static void
|
|
dissect_nsh_md_type_1(tvbuff_t *tvb, proto_tree *nsh_tree, int offset)
|
|
{
|
|
|
|
proto_tree_add_item(nsh_tree, hf_nsh_context_header, tvb, offset, 4, ENC_NA);
|
|
proto_tree_add_item(nsh_tree, hf_nsh_context_header, tvb, offset + 4, 4, ENC_NA);
|
|
proto_tree_add_item(nsh_tree, hf_nsh_context_header, tvb, offset + 8, 4, ENC_NA);
|
|
proto_tree_add_item(nsh_tree, hf_nsh_context_header, tvb, offset + 12, 4, ENC_NA);
|
|
|
|
|
|
}
|
|
|
|
/*
|
|
*Dissect Variable Length Context headers
|
|
*
|
|
*/
|
|
|
|
static void
|
|
dissect_nsh_md_type_2(tvbuff_t *tvb, proto_tree *nsh_tree, int offset, int nsh_bytes_len)
|
|
{
|
|
|
|
int type2_metadata_len = 0;
|
|
|
|
while (offset < nsh_bytes_len) {
|
|
|
|
proto_tree_add_item(nsh_tree, hf_nsh_metadata_class, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(nsh_tree, hf_nsh_metadata_type, tvb, offset + 2, 1, ENC_BIG_ENDIAN);
|
|
|
|
/* Bits 24 - 26 are reserved */
|
|
proto_tree_add_item(nsh_tree, hf_nsh_metadata_reservedbits, tvb, offset + 3, 1, ENC_BIG_ENDIAN);
|
|
|
|
/*Bits 27-31 represent length in 4 bytes words*/
|
|
proto_tree_add_item(nsh_tree, hf_nsh_metadata_length, tvb, offset + 3, 1, ENC_BIG_ENDIAN);
|
|
type2_metadata_len = 4 * tvb_get_bits8(tvb, ((offset + 3) * 8) + 3, 5);
|
|
|
|
if (type2_metadata_len >= 4)
|
|
proto_tree_add_item(nsh_tree, hf_nsh_metadata, tvb, offset + 4, type2_metadata_len, ENC_NA);
|
|
|
|
offset = offset + 4 + type2_metadata_len;
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
*Dissect Network Service Header
|
|
*
|
|
*/
|
|
|
|
static int
|
|
dissect_nsh(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
|
|
{
|
|
|
|
int offset = 0;
|
|
int md_type = -1;
|
|
int nsh_bytes_len = 0;
|
|
int nsh_next_proto = -1;
|
|
int captured_length;
|
|
tvbuff_t *next_tvb;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "NSH");
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Network Service Header");
|
|
|
|
captured_length = tvb_captured_length(tvb);
|
|
|
|
|
|
if (tree) {
|
|
proto_item *ti;
|
|
proto_tree *nsh_tree;
|
|
|
|
/* Bits 10 - 15 contain length value */
|
|
nsh_bytes_len = 4 * tvb_get_bits8(tvb, 10, 6);
|
|
|
|
ti = proto_tree_add_item(tree, proto_nsh, tvb, offset, nsh_bytes_len, ENC_NA);
|
|
nsh_tree = proto_item_add_subtree(ti, ett_nsh);
|
|
|
|
/*NSH Base Header*/
|
|
|
|
proto_tree_add_item(nsh_tree, hf_nsh_version, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(nsh_tree, hf_nsh_oam, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(nsh_tree, hf_nsh_critical_metadata, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
|
|
/* Bits 4 - 9 are reserved */
|
|
proto_tree_add_item(nsh_tree, hf_nsh_reservedbits, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(nsh_tree, hf_nsh_length, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
|
|
md_type = tvb_get_guint8(tvb, offset + 2);
|
|
proto_tree_add_item(nsh_tree, hf_nsh_md_type, tvb, offset + 2, 1, ENC_BIG_ENDIAN);
|
|
|
|
nsh_next_proto = tvb_get_guint8(tvb, offset + 3);
|
|
proto_tree_add_item(nsh_tree, hf_nsh_next_proto, tvb, offset + 3, 1, ENC_BIG_ENDIAN);
|
|
|
|
/*NSH Service Path Header */
|
|
offset = offset + 4;
|
|
proto_tree_add_item(nsh_tree, hf_nsh_service_pathID, tvb, offset, 3, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(nsh_tree, hf_nsh_service_index, tvb, offset + 3, 1, ENC_BIG_ENDIAN);
|
|
|
|
/* Decode Context Headers */
|
|
offset = offset + 4;
|
|
switch (md_type) {
|
|
|
|
case MD_TYPE_1:
|
|
dissect_nsh_md_type_1(tvb, nsh_tree, offset);
|
|
break;
|
|
|
|
case MD_TYPE_2:
|
|
|
|
/* MD Type 2 indicates ZERO or more Variable Length Context headers*/
|
|
if (nsh_bytes_len > 8)
|
|
dissect_nsh_md_type_2(tvb, nsh_tree, offset, nsh_bytes_len);
|
|
break;
|
|
|
|
}
|
|
|
|
/*Decode next protocol payload */
|
|
|
|
if (captured_length > (nsh_bytes_len)) {
|
|
|
|
next_tvb = tvb_new_subset_remaining(tvb, nsh_bytes_len);
|
|
switch (nsh_next_proto) {
|
|
|
|
case NSH_IPV4:
|
|
call_dissector(dissector_ip, next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
case NSH_IPV6:
|
|
call_dissector(dissector_ipv6, next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
case NSH_ETHERNET:
|
|
call_dissector(dissector_eth, next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
return tvb_captured_length(tvb);
|
|
|
|
}
|
|
|
|
void
|
|
proto_register_nsh(void)
|
|
{
|
|
static hf_register_info nsh_info[] = {
|
|
|
|
/* Network Service Header fields */
|
|
{ &hf_nsh_version,
|
|
{ "Version", "nsh.version",
|
|
FT_UINT16, BASE_DEC_HEX, NULL, 0xC000,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{ &hf_nsh_oam,
|
|
{ "O Bit", "nsh.Obit",
|
|
FT_UINT16, BASE_DEC, NULL, 0x2000,
|
|
"OAM Bit", HFILL }
|
|
},
|
|
|
|
|
|
{ &hf_nsh_critical_metadata,
|
|
{ "C Bit", "nsh.CBit",
|
|
FT_UINT16, BASE_DEC, NULL, 0x1000,
|
|
"Critical Metadata Bit", HFILL }
|
|
},
|
|
|
|
|
|
{ &hf_nsh_reservedbits,
|
|
{ "Reserved Bits", "nsh.reservedbits",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0FC0,
|
|
"Reserved bits within NSH Base Header", HFILL }
|
|
},
|
|
|
|
|
|
{ &hf_nsh_length,
|
|
{ "Length", "nsh.length",
|
|
FT_UINT16, BASE_DEC_HEX, NULL, 0x003F,
|
|
"Total length, in 4-byte words, of NSH including Base, Service Path headers and optional variable TLVs", HFILL }
|
|
},
|
|
|
|
|
|
{ &hf_nsh_md_type,
|
|
{ "MD Type", "nsh.mdtype",
|
|
FT_UINT8, BASE_DEC_HEX, NULL, 0x00,
|
|
"Metadata Type defines the format of the metadata being carried", HFILL }
|
|
},
|
|
|
|
|
|
{ &hf_nsh_next_proto,
|
|
{ "Next Protocol", "nsh.nextproto",
|
|
FT_UINT8, BASE_DEC_HEX, VALS(nsh_next_protocols), 0x00,
|
|
"Protocol type of the original packet", HFILL }
|
|
},
|
|
|
|
|
|
{ &hf_nsh_service_pathID,
|
|
{ "SPI", "nsh.spi",
|
|
FT_UINT24, BASE_DEC_HEX, NULL, 0x00,
|
|
"Service Path Identifier", HFILL }
|
|
},
|
|
|
|
|
|
{ &hf_nsh_service_index,
|
|
{ "SI", "nsh.si",
|
|
FT_UINT8, BASE_DEC_HEX, NULL, 0x00,
|
|
"Service Index", HFILL }
|
|
},
|
|
|
|
|
|
|
|
{ &hf_nsh_context_header,
|
|
{ "Context Header", "nsh.contextheader",
|
|
FT_BYTES, BASE_NONE, NULL, 0x00,
|
|
"Manadatory Context Header", HFILL }
|
|
},
|
|
|
|
|
|
{ &hf_nsh_metadata_class,
|
|
{ "TLV Class", "nsh.metadataclass",
|
|
FT_UINT16, BASE_DEC_HEX, NULL, 0x00,
|
|
"TLV class describes the scope of the metadata type field", HFILL }
|
|
},
|
|
|
|
|
|
{ &hf_nsh_metadata_type,
|
|
{ "Type", "nsh.metadatatype",
|
|
FT_UINT8, BASE_DEC_HEX, NULL, 0x00,
|
|
"Type of metadata", HFILL }
|
|
},
|
|
|
|
|
|
{ &hf_nsh_metadata_reservedbits,
|
|
{ "Reserved Bits", "nsh.metadatareservedbits",
|
|
FT_UINT8, BASE_HEX, NULL, 0xE0,
|
|
"Reserved Bits within Variable Length Metadata header", HFILL }
|
|
},
|
|
|
|
|
|
{ &hf_nsh_metadata_length,
|
|
{ "Length", "nsh.metadatalen",
|
|
FT_UINT8, BASE_HEX, NULL, 0x1F,
|
|
"Length of the variable metadata in 4-byte words", HFILL }
|
|
},
|
|
|
|
|
|
{ &hf_nsh_metadata,
|
|
{ "Variable Metadata", "nsh.metadata",
|
|
FT_BYTES, BASE_NONE, NULL, 0x00,
|
|
"Variable length metadata", HFILL }
|
|
},
|
|
|
|
};
|
|
|
|
|
|
static gint *ett[] = {
|
|
&ett_nsh,
|
|
};
|
|
|
|
proto_nsh = proto_register_protocol("Network Service Header",
|
|
"NSH", "nsh");
|
|
proto_register_field_array(proto_nsh, nsh_info, array_length(nsh_info));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_nsh(void)
|
|
{
|
|
|
|
dissector_handle_t nsh_handle;
|
|
|
|
nsh_handle = create_dissector_handle(dissect_nsh, proto_nsh);
|
|
dissector_add_uint("gre.proto", ETHERTYPE_NSH, nsh_handle);
|
|
dissector_add_uint("vxlan.next_proto", VXLAN_NSH, nsh_handle);
|
|
|
|
dissector_ip = find_dissector_add_dependency("ip", proto_nsh);
|
|
dissector_ipv6 = find_dissector_add_dependency("ipv6", proto_nsh);
|
|
dissector_eth = find_dissector_add_dependency("eth_maybefcs", proto_nsh);
|
|
|
|
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|