forked from osmocom/wireshark
491 lines
12 KiB
C
491 lines
12 KiB
C
/* packet-isis-snp.c
|
|
* Routines for decoding isis complete & partial SNP and their payload
|
|
*
|
|
* $Id: packet-isis-snp.c,v 1.10 2001/07/02 00:19:34 guy Exp $
|
|
* Stuart Stanley <stuarts@mxmail.net>
|
|
*
|
|
* Ethereal - Network traffic analyzer
|
|
* By Gerald Combs <gerald@zing.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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#ifdef HAVE_SYS_TYPES_H
|
|
# include <sys/types.h>
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <glib.h>
|
|
#include "packet.h"
|
|
#include "packet-osi.h"
|
|
#include "packet-isis.h"
|
|
#include "packet-isis-clv.h"
|
|
#include "packet-isis-lsp.h"
|
|
#include "packet-isis-snp.h"
|
|
|
|
/* csnp packets */
|
|
static int proto_isis_csnp = -1;
|
|
static int hf_isis_csnp_pdu_length = -1;
|
|
static gint ett_isis_csnp = -1;
|
|
static gint ett_isis_csnp_lsp_entries = -1;
|
|
static gint ett_isis_csnp_authentication = -1;
|
|
static gint ett_isis_csnp_clv_unknown = -1;
|
|
|
|
/* psnp packets */
|
|
static int proto_isis_psnp = -1;
|
|
static int hf_isis_psnp_pdu_length = -1;
|
|
static gint ett_isis_psnp = -1;
|
|
static gint ett_isis_psnp_lsp_entries = -1;
|
|
static gint ett_isis_psnp_authentication = -1;
|
|
static gint ett_isis_psnp_clv_unknown = -1;
|
|
|
|
static void dissect_l1_snp_authentication_clv(tvbuff_t *tvb, packet_info *pinfo,
|
|
proto_tree *tree, int offset,
|
|
int id_length, int length);
|
|
static void dissect_l2_snp_authentication_clv(tvbuff_t *tvb, packet_info *pinfo,
|
|
proto_tree *tree, int offset,
|
|
int id_length, int length);
|
|
static void dissect_snp_lsp_entries(tvbuff_t *tvb, packet_info *pinfo,
|
|
proto_tree *tree, int offset,
|
|
int id_length, int length);
|
|
|
|
static const isis_clv_handle_t clv_l1_csnp_opts[] = {
|
|
{
|
|
ISIS_CLV_L1_CSNP_LSP_ENTRIES,
|
|
"LSP entries",
|
|
&ett_isis_csnp_lsp_entries,
|
|
dissect_snp_lsp_entries
|
|
},
|
|
{
|
|
ISIS_CLV_L1_CSNP_AUTHENTICATION_NS,
|
|
"Authentication(non spec)",
|
|
&ett_isis_csnp_authentication,
|
|
dissect_l1_snp_authentication_clv
|
|
},
|
|
{
|
|
ISIS_CLV_L1_CSNP_AUTHENTICATION,
|
|
"Authentication",
|
|
&ett_isis_csnp_authentication,
|
|
dissect_l1_snp_authentication_clv
|
|
},
|
|
{
|
|
0, "", NULL, NULL
|
|
}
|
|
};
|
|
|
|
static const isis_clv_handle_t clv_l2_csnp_opts[] = {
|
|
{
|
|
ISIS_CLV_L2_CSNP_LSP_ENTRIES,
|
|
"LSP entries",
|
|
&ett_isis_csnp_lsp_entries,
|
|
dissect_snp_lsp_entries
|
|
},
|
|
{
|
|
ISIS_CLV_L2_CSNP_AUTHENTICATION_NS,
|
|
"Authentication(non spec)",
|
|
&ett_isis_csnp_authentication,
|
|
dissect_l2_snp_authentication_clv
|
|
},
|
|
{
|
|
ISIS_CLV_L2_CSNP_AUTHENTICATION,
|
|
"Authentication",
|
|
&ett_isis_csnp_authentication,
|
|
dissect_l2_snp_authentication_clv
|
|
},
|
|
{
|
|
0, "", NULL, NULL
|
|
}
|
|
};
|
|
|
|
static const isis_clv_handle_t clv_l1_psnp_opts[] = {
|
|
{
|
|
ISIS_CLV_L1_PSNP_LSP_ENTRIES,
|
|
"LSP entries",
|
|
&ett_isis_psnp_lsp_entries,
|
|
dissect_snp_lsp_entries
|
|
},
|
|
{
|
|
ISIS_CLV_L1_PSNP_AUTHENTICATION_NS,
|
|
"Authentication(non spec)",
|
|
&ett_isis_psnp_authentication,
|
|
dissect_l1_snp_authentication_clv
|
|
},
|
|
{
|
|
ISIS_CLV_L1_PSNP_AUTHENTICATION,
|
|
"Authentication",
|
|
&ett_isis_psnp_authentication,
|
|
dissect_l1_snp_authentication_clv
|
|
},
|
|
{
|
|
0, "", NULL, NULL
|
|
}
|
|
};
|
|
|
|
static const isis_clv_handle_t clv_l2_psnp_opts[] = {
|
|
{
|
|
ISIS_CLV_L2_PSNP_LSP_ENTRIES,
|
|
"LSP entries",
|
|
&ett_isis_psnp_lsp_entries,
|
|
dissect_snp_lsp_entries
|
|
},
|
|
{
|
|
ISIS_CLV_L2_PSNP_AUTHENTICATION,
|
|
"Authentication",
|
|
&ett_isis_psnp_authentication,
|
|
dissect_l2_snp_authentication_clv
|
|
},
|
|
{
|
|
ISIS_CLV_L2_PSNP_AUTHENTICATION_NS,
|
|
"Authentication(non spec)",
|
|
&ett_isis_psnp_authentication,
|
|
dissect_l2_snp_authentication_clv
|
|
},
|
|
{
|
|
0, "", NULL, NULL
|
|
}
|
|
};
|
|
/*
|
|
* Name: dissect_snp_lsp_entries()
|
|
*
|
|
* Description:
|
|
* All the snp packets use a common payload format. We have up
|
|
* to n entries (based on length), which are made of:
|
|
* 2 : remaining life time
|
|
* 8 : lsp id
|
|
* 4 : sequence number
|
|
* 2 : checksum
|
|
*
|
|
* Input:
|
|
* tvbuff_t * : tvbuffer for packet data
|
|
* packet_info * : info for current packet
|
|
* proto_tree * : protocol display tree to fill out. May be NULL
|
|
* int : offset into packet data where we are.
|
|
* int : length of payload to decode.
|
|
* int : length of IDs in packet.
|
|
*
|
|
* Output:
|
|
* void, but we will add to proto tree if !NULL.
|
|
*/
|
|
static void
|
|
dissect_snp_lsp_entries(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
int offset, int id_length, int length)
|
|
{
|
|
while ( length > 0 ) {
|
|
if ( length < 2+id_length+2+4+2 ) {
|
|
isis_dissect_unknown(tvb, pinfo, tree, offset,
|
|
"Short SNP header entry (%d vs %d)", length,
|
|
2+id_length+2+4+2 );
|
|
return;
|
|
}
|
|
|
|
proto_tree_add_text(tree, tvb, offset, 2, "Remaining life : %d",
|
|
tvb_get_ntohs(tvb, offset));
|
|
length -= 2;
|
|
offset += 2;
|
|
|
|
isis_lsp_decode_lsp_id(tvb, pinfo, tree, offset,
|
|
"LSP ID ", id_length);
|
|
length -= id_length + 2;
|
|
offset += id_length + 2;
|
|
|
|
proto_tree_add_text(tree, tvb, offset, 4,
|
|
"LSP Sequence Number : 0x%04x",
|
|
tvb_get_ntohl(tvb, offset));
|
|
length -= 4;
|
|
offset += 4;
|
|
|
|
proto_tree_add_text(tree, tvb, offset, 2,
|
|
"LSP checksum : 0x%02x",
|
|
tvb_get_ntohs(tvb, offset));
|
|
length -= 2;
|
|
offset += 2;
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* Name: isis_dissect_isis_csnp()
|
|
*
|
|
* Description:
|
|
* Tear apart a L1 or L2 CSNP header and then call into payload dissect
|
|
* to pull apart the lsp id payload.
|
|
*
|
|
* Input:
|
|
* tvbuff_t * : tvbuffer for packet data
|
|
* packet_info * : info for current packet
|
|
* proto_tree * : protocol display tree to add to. May be NULL.
|
|
* int offset : our offset into packet data.
|
|
* int : type (l1 csnp, l2 csnp)
|
|
* int : header length of packet.
|
|
* int : length of IDs in packet.
|
|
*
|
|
* Output:
|
|
* void, but we will add to proto tree if !NULL.
|
|
*/
|
|
void
|
|
isis_dissect_isis_csnp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
int offset, int type, int header_length, int id_length)
|
|
{
|
|
proto_item *ti;
|
|
proto_tree *csnp_tree = NULL;
|
|
guint16 pdu_length;
|
|
int len;
|
|
|
|
if (!proto_is_protocol_enabled(proto_isis_csnp)) {
|
|
dissect_data(tvb, offset, pinfo, tree);
|
|
return;
|
|
}
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_isis_csnp, tvb,
|
|
offset, tvb_length_remaining(tvb, offset), FALSE);
|
|
csnp_tree = proto_item_add_subtree(ti, ett_isis_csnp);
|
|
}
|
|
|
|
pdu_length = tvb_get_ntohs(tvb, offset);
|
|
if (tree) {
|
|
proto_tree_add_uint(csnp_tree, hf_isis_csnp_pdu_length, tvb,
|
|
offset, 2, pdu_length);
|
|
}
|
|
offset += 2;
|
|
|
|
if (tree) {
|
|
proto_tree_add_text(csnp_tree, tvb, offset, id_length + 1,
|
|
"Source id : %s",
|
|
print_system_id( tvb_get_ptr(tvb, offset, id_length+1), id_length+1 ) );
|
|
}
|
|
offset += id_length + 1;
|
|
|
|
if (tree) {
|
|
isis_lsp_decode_lsp_id(tvb, pinfo, csnp_tree, offset,
|
|
"Start LSP id ", id_length );
|
|
}
|
|
offset += id_length + 2;
|
|
|
|
if (tree) {
|
|
isis_lsp_decode_lsp_id(tvb, pinfo, csnp_tree, offset,
|
|
"End LSP id ", id_length );
|
|
}
|
|
offset += id_length + 2;
|
|
|
|
len = pdu_length - header_length;
|
|
if (len < 0) {
|
|
return;
|
|
}
|
|
/* Call into payload dissector */
|
|
if (type == ISIS_TYPE_L1_CSNP ) {
|
|
isis_dissect_clvs(tvb, pinfo, csnp_tree, offset,
|
|
clv_l1_csnp_opts, len, id_length,
|
|
ett_isis_csnp_clv_unknown );
|
|
} else {
|
|
isis_dissect_clvs(tvb, pinfo, csnp_tree, offset,
|
|
clv_l2_csnp_opts, len, id_length,
|
|
ett_isis_csnp_clv_unknown );
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Name: isis_dissect_isis_psnp()
|
|
*
|
|
* Description:
|
|
* Tear apart a L1 or L2 PSNP header and then call into payload dissect
|
|
* to pull apart the lsp id payload.
|
|
*
|
|
* Input:
|
|
* tvbuff_t * : tvbuffer for packet data
|
|
* packet_info * : info for current packet
|
|
* proto_tree * : protocol display tree to add to. May be NULL.
|
|
* int : our offset into packet data
|
|
* int : type (l1 psnp, l2 psnp)
|
|
* int : header length of packet.
|
|
* int : length of IDs in packet.
|
|
*
|
|
* Output:
|
|
* void, but we will add to proto tree if !NULL.
|
|
*/
|
|
void
|
|
isis_dissect_isis_psnp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
int offset, int type, int header_length, int id_length)
|
|
{
|
|
proto_item *ti;
|
|
proto_tree *psnp_tree = NULL;
|
|
guint16 pdu_length;
|
|
int len;
|
|
|
|
if (!proto_is_protocol_enabled(proto_isis_psnp)) {
|
|
dissect_data(tvb, offset, pinfo, tree);
|
|
return;
|
|
}
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_isis_psnp, tvb,
|
|
offset, tvb_length_remaining(tvb, offset), FALSE);
|
|
psnp_tree = proto_item_add_subtree(ti, ett_isis_psnp);
|
|
}
|
|
|
|
pdu_length = tvb_get_ntohs(tvb, offset);
|
|
if (tree) {
|
|
proto_tree_add_uint(psnp_tree, hf_isis_psnp_pdu_length, tvb,
|
|
offset, 2, pdu_length);
|
|
}
|
|
offset += 2;
|
|
|
|
if (tree) {
|
|
proto_tree_add_text(psnp_tree, tvb, offset, id_length + 1,
|
|
"Source id: %s",
|
|
print_system_id( tvb_get_ptr(tvb, offset, id_length+1), id_length + 1 ) );
|
|
}
|
|
offset += id_length + 1;
|
|
|
|
len = pdu_length - header_length;
|
|
if (len < 0) {
|
|
isis_dissect_unknown(tvb, pinfo, tree, offset,
|
|
"packet header length %d went beyond packet",
|
|
header_length );
|
|
return;
|
|
}
|
|
/* Call into payload dissector */
|
|
if (type == ISIS_TYPE_L1_CSNP ) {
|
|
isis_dissect_clvs(tvb, pinfo, psnp_tree, offset,
|
|
clv_l1_csnp_opts, len, id_length,
|
|
ett_isis_psnp_clv_unknown );
|
|
} else {
|
|
isis_dissect_clvs(tvb, pinfo, psnp_tree, offset,
|
|
clv_l2_csnp_opts, len, id_length,
|
|
ett_isis_psnp_clv_unknown );
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Name: dissect_L1_snp_authentication_clv()
|
|
*
|
|
* Description:
|
|
* Decode for a lsp packets authenticaion clv. Calls into the
|
|
* clv common one. An auth inside a L1 SNP is a per area password
|
|
*
|
|
* Input:
|
|
* tvbuff_t * : tvbuffer for packet data
|
|
* packet_info * : info for current packet
|
|
* proto_tree * : proto tree to build on (may be null)
|
|
* int : current offset into packet data
|
|
* int : length of IDs in packet.
|
|
* int : length of this clv
|
|
*
|
|
* Output:
|
|
* void, will modify proto_tree if not null.
|
|
*/
|
|
static void
|
|
dissect_l1_snp_authentication_clv(tvbuff_t *tvb, packet_info *pinfo,
|
|
proto_tree *tree, int offset,
|
|
int id_length, int length)
|
|
{
|
|
isis_dissect_authentication_clv(tvb, pinfo, tree, offset, length,
|
|
"Per area authentication" );
|
|
}
|
|
|
|
/*
|
|
* Name: dissect_l2_authentication_clv()
|
|
*
|
|
* Description:
|
|
* Decode for a lsp packets authenticaion clv. Calls into the
|
|
* clv common one. An auth inside a L2 LSP is a per domain password
|
|
*
|
|
* Input:
|
|
* tvbuff_t * : tvbuffer for packet data
|
|
* packet_info * : info for current packet
|
|
* proto_tree * : proto tree to build on (may be null)
|
|
* int : current offset into packet data
|
|
* int : length of IDs in packet.
|
|
* int : length of this clv
|
|
*
|
|
* Output:
|
|
* void, will modify proto_tree if not null.
|
|
*/
|
|
static void
|
|
dissect_l2_snp_authentication_clv(tvbuff_t *tvb, packet_info *pinfo,
|
|
proto_tree *tree, int offset,
|
|
int id_length, int length)
|
|
{
|
|
isis_dissect_authentication_clv(tvb, pinfo, tree, offset, length,
|
|
"Per domain authentication" );
|
|
}
|
|
|
|
/*
|
|
* Name: proto_register_isis_csnp()
|
|
*
|
|
* Description:
|
|
* Register our protocol sub-sets with protocol manager.
|
|
* NOTE: this procedure is autolinked by the makefile process that
|
|
* builds register.c
|
|
*
|
|
*/
|
|
void
|
|
proto_register_isis_csnp(void) {
|
|
static hf_register_info hf[] = {
|
|
{ &hf_isis_csnp_pdu_length,
|
|
{ "PDU length", "isis_csnp.pdu_length", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0, "", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_isis_csnp,
|
|
&ett_isis_csnp_lsp_entries,
|
|
&ett_isis_csnp_authentication,
|
|
&ett_isis_csnp_clv_unknown,
|
|
};
|
|
|
|
proto_isis_csnp = proto_register_protocol(PROTO_STRING_CSNP,
|
|
"ISIS CSNP", "isis_csnp");
|
|
proto_register_field_array(proto_isis_csnp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
|
|
/*
|
|
* Name: proto_register_isis_psnp()
|
|
*
|
|
* Description:
|
|
* Register our protocol sub-sets with protocol manager.
|
|
* NOTE: this procedure is autolinked by the makefile process that
|
|
* builds register.c
|
|
*/
|
|
void
|
|
proto_register_isis_psnp(void) {
|
|
static hf_register_info hf[] = {
|
|
{ &hf_isis_psnp_pdu_length,
|
|
{ "PDU length", "isis_psnp.pdu_length", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0, "", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_isis_psnp,
|
|
&ett_isis_psnp_lsp_entries,
|
|
&ett_isis_psnp_authentication,
|
|
&ett_isis_psnp_clv_unknown,
|
|
};
|
|
|
|
proto_isis_psnp = proto_register_protocol(PROTO_STRING_PSNP,
|
|
"ISIS PSNP", "isis_psnp");
|
|
proto_register_field_array(proto_isis_psnp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|