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wireshark/packet-isis-hello.c

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/* packet-isis-hello.c
* Routines for decoding isis hello packets and their CLVs
*
* $Id: packet-isis-hello.c,v 1.10 2000/08/13 14:08:19 deniel 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-hello.h"
/* hello packets */
static int proto_isis_hello = -1;
static int hf_isis_hello_circuit_reserved = -1;
static int hf_isis_hello_source_id = -1;
static int hf_isis_hello_holding_timer = -1;
static int hf_isis_hello_pdu_length = -1;
static int hf_isis_hello_priority_reserved = -1;
static int hf_isis_hello_lan_id = -1;
static int hf_isis_hello_local_circuit_id = -1;
static int hf_isis_hello_clv_ipv4_int_addr = -1;
static gint ett_isis_hello = -1;
static gint ett_isis_hello_clv_area_addr = -1;
static gint ett_isis_hello_clv_is_neighbors = -1;
static gint ett_isis_hello_clv_padding = -1;
static gint ett_isis_hello_clv_unknown = -1;
static gint ett_isis_hello_clv_nlpid = -1;
static gint ett_isis_hello_clv_auth = -1;
static gint ett_isis_hello_clv_ipv4_int_addr = -1;
static const value_string isis_hello_circuit_type_vals[] = {
{ ISIS_HELLO_TYPE_RESERVED, "Reserved 0 (discard PDU)"},
{ ISIS_HELLO_TYPE_LEVEL_1, "Level 1 only"},
{ ISIS_HELLO_TYPE_LEVEL_2, "Level 2 only"},
{ ISIS_HELLO_TYPE_LEVEL_12, "Level 1 and 2"},
{ 0, NULL} };
/*
* Predclare dissectors for use in clv dissection.
*/
static void dissect_hello_area_address_clv(const u_char *pd, int offset,
guint length, int id_length, frame_data *fd, proto_tree *tree);
static void dissect_hello_is_neighbors_clv(const u_char *pd, int offset,
guint length, int id_length, frame_data *fd, proto_tree *tree);
static void dissect_hello_padding_clv(const u_char *pd, int offset,
guint length, int id_length, frame_data *fd, proto_tree *tree);
static void dissect_hello_nlpid_clv(const u_char *pd, int offset,
guint length, int id_length, frame_data *fd, proto_tree *tree);
static void dissect_hello_ip_int_addr_clv(const u_char *pd, int offset,
guint length, int id_length, frame_data *fd, proto_tree *tree);
static void dissect_hello_auth_clv(const u_char *pd, int offset,
guint length, int id_length, frame_data *fd, proto_tree *tree);
static const isis_clv_handle_t clv_l1_hello_opts[] = {
{
ISIS_CLV_L1H_AREA_ADDRESS,
"Area address(es)",
&ett_isis_hello_clv_area_addr,
dissect_hello_area_address_clv
},
{
ISIS_CLV_L1H_IS_NEIGHBORS,
"IS Neighbor(s)",
&ett_isis_hello_clv_is_neighbors,
dissect_hello_is_neighbors_clv
},
{
ISIS_CLV_L1H_PADDING,
"Padding",
&ett_isis_hello_clv_padding,
dissect_hello_padding_clv
},
{
ISIS_CLV_L1H_NLPID,
"NLPID",
&ett_isis_hello_clv_nlpid,
dissect_hello_nlpid_clv
},
{
ISIS_CLV_L1H_IP_INTERFACE_ADDR,
"IP Interface address(es)",
&ett_isis_hello_clv_ipv4_int_addr,
dissect_hello_ip_int_addr_clv
},
{
ISIS_CLV_L1H_AUTHENTICATION_NS,
"Authentication(non spec)",
&ett_isis_hello_clv_auth,
dissect_hello_auth_clv
},
{
ISIS_CLV_L1H_AUTHENTICATION,
"Authentication",
&ett_isis_hello_clv_auth,
dissect_hello_auth_clv
},
{
0,
"",
NULL,
NULL
}
};
static const isis_clv_handle_t clv_l2_hello_opts[] = {
{
ISIS_CLV_L2H_AREA_ADDRESS,
"Area address(es)",
&ett_isis_hello_clv_area_addr,
dissect_hello_area_address_clv
},
{
ISIS_CLV_L2H_IS_NEIGHBORS,
"IS Neighbor(s)",
&ett_isis_hello_clv_is_neighbors,
dissect_hello_is_neighbors_clv
},
{
ISIS_CLV_L2H_PADDING,
"Padding",
&ett_isis_hello_clv_padding,
dissect_hello_padding_clv
},
{
ISIS_CLV_L2H_NLPID,
"NLPID",
&ett_isis_hello_clv_nlpid,
dissect_hello_nlpid_clv
},
{
ISIS_CLV_L2H_IP_INTERFACE_ADDR,
"IP Interface address(es)",
&ett_isis_hello_clv_ipv4_int_addr,
dissect_hello_ip_int_addr_clv
},
{
ISIS_CLV_L2H_AUTHENTICATION_NS,
"Authentication(non spec)",
&ett_isis_hello_clv_auth,
dissect_hello_auth_clv
},
{
ISIS_CLV_L2H_AUTHENTICATION,
"Authentication",
&ett_isis_hello_clv_auth,
dissect_hello_auth_clv
},
{
0,
"",
NULL,
NULL
}
};
static const isis_clv_handle_t clv_ptp_hello_opts[] = {
{
ISIS_CLV_PTP_AREA_ADDRESS,
"Area address(es)",
&ett_isis_hello_clv_area_addr,
dissect_hello_area_address_clv
},
{
ISIS_CLV_PTP_PADDING,
"Padding",
&ett_isis_hello_clv_padding,
dissect_hello_padding_clv
},
{
ISIS_CLV_PTP_NLPID,
"NLPID",
&ett_isis_hello_clv_nlpid,
dissect_hello_nlpid_clv
},
{
ISIS_CLV_PTP_IP_INTERFACE_ADDR,
"IP Interface address(es)",
&ett_isis_hello_clv_ipv4_int_addr,
dissect_hello_ip_int_addr_clv
},
{
ISIS_CLV_PTP_AUTHENTICATION_NS,
"Authentication(non spec)",
&ett_isis_hello_clv_auth,
dissect_hello_auth_clv
},
{
ISIS_CLV_PTP_AUTHENTICATION,
"Authentication",
&ett_isis_hello_clv_auth,
dissect_hello_auth_clv
},
{
0,
"",
NULL,
NULL
}
};
/*
* Name: dissect_hello_nlpid_clv()
*
* Description:
* Decode for a hello packets NLPID clv. Calls into the
* clv common one.
*
* Input:
* u_char * : packet data
* int : current offset into packet data
* guint : length of this clv
* int : length of IDs in packet.
* frame_data * : frame data
* proto_tree * : proto tree to build on (may be null)
*
* Output:
* void, will modify proto_tree if not null.
*/
static void
dissect_hello_nlpid_clv(const u_char *pd, int offset,
guint length, int id_length, frame_data *fd, proto_tree *tree) {
isis_dissect_nlpid_clv(pd, offset, length, fd, tree );
}
/*
* Name: dissect_hello_ip_int_addr_clv()
*
* Description:
* Decode for a hello packets ip interface addr clv. Calls into the
* clv common one.
*
* Input:
* u_char * : packet data
* int : current offset into packet data
* guint : length of this clv
* int : length of IDs in packet.
* frame_data * : frame data
* proto_tree * : proto tree to build on (may be null)
*
* Output:
* void, will modify proto_tree if not null.
*/
static void
dissect_hello_ip_int_addr_clv(const u_char *pd, int offset,
guint length, int id_length, frame_data *fd, proto_tree *tree) {
isis_dissect_ip_int_clv(pd, offset, length, fd, tree,
hf_isis_hello_clv_ipv4_int_addr );
}
/*
* Name: dissect_hello_auth_clv()
*
* Description:
* Decode for a hello packets authenticaion clv. Calls into the
* clv common one. An auth inside a hello packet is a perlink
* password.
*
* Input:
* u_char * : packet data
* int : current offset into packet data
* guint : length of this clv
* int : length of IDs in packet.
* frame_data * : frame data
* proto_tree * : proto tree to build on (may be null)
*
* Output:
* void, will modify proto_tree if not null.
*/
static void
dissect_hello_auth_clv(const u_char *pd, int offset,
guint length, int id_length, frame_data *fd, proto_tree *tree) {
isis_dissect_authentication_clv(pd, offset, length, fd, tree,
"Per Link authentication" );
}
/*
* Name: dissect_hello_area_address_clv()
*
* Description:
* Decode for a hello packets area address clv. Calls into the
* clv common one.
*
* Input:
* u_char * : packet data
* int : current offset into packet data
* guint : length of this clv
* int : length of IDs in packet.
* frame_data * : frame data
* proto_tree * : proto tree to build on (may be null)
*
* Output:
* void, will modify proto_tree if not null.
*/
static void
dissect_hello_area_address_clv(const u_char *pd, int offset,
guint length, int id_length, frame_data *fd, proto_tree *tree) {
isis_dissect_area_address_clv(pd, offset, length, fd, tree );
}
/*
* Name: isis_dissect_is_neighbors_clv()
*
* Description:
* Take apart a IS neighbor packet. A neighbor is n 6 byte packets.
* (they tend to be an 802.3 MAC address, but its not required).
*
* Input:
* u_char * : packet data
* int : offset into packet data where we are.
* guint : length of clv we are decoding
* int : length of IDs in packet.
* frame_data * : frame data (complete frame)
* proto_tree * : protocol display tree to fill out. May be NULL
* gint : tree id to use for proto tree.
*
* Output:
* void, but we will add to proto tree if !NULL.
*/
void
dissect_hello_is_neighbors_clv(const u_char *pd, int offset,
guint length, int id_length, frame_data *fd, proto_tree *tree ) {
while ( length > 0 ) {
if (length<6) {
isis_dissect_unknown(offset, length, tree, fd,
"short is neighbor (%d vs 6)", length );
return;
}
/*
* Lets turn the area address into "standard" 0000.0000.etc
* format string.
*/
if ( tree ) {
proto_tree_add_text ( tree, NullTVB, offset, 6,
"IS Neighbor: %s", print_system_id( pd + offset, 6 ) );
}
offset += 6;
length -= 6;
}
}
/*
* Name: dissect_hello_padding_clv()
*
* Description:
* Decode for a hello packet's padding clv. Padding does nothing,
* so we just return.
*
* Input:
* u_char * : packet data
* int : current offset into packet data
* guint : length of this clv
* int : length of IDs in packet.
* frame_data * : frame data
* proto_tree * : proto tree to build on (may be null)
*
* Output:
* void
*/
static void
dissect_hello_padding_clv(const u_char *pd, int offset, guint length,
int id_length, frame_data *fd, proto_tree *tree) {
/* nothing to do here! */
}
/*
* Name: isis_dissect_isis_hello()
*
* Description:
* This procedure rips apart the various types of ISIS hellos. L1H and
* L2H's are identical for the most part, while the PTP hello has
* a shorter header.
*
* Input:
* int : hello type, a la packet-isis.h ISIS_TYPE_* values
* int : header length of packet.
* int : length of IDs in packet.
* u_char * : packet data
* int offset : our offset into packet data.
* frame_data * : frame data
* proto_tree * : protocol display tree to add to. May be NULL.
*
* Output:
* void, will modify proto_tree if not NULL.
*/
void
isis_dissect_isis_hello(int hello_type, int header_length, int id_length,
const u_char *pd, int offset, frame_data *fd, proto_tree *tree){
proto_item *ti;
proto_tree *hello_tree = NULL;
int len;
int hlen;
guint16 pdu_length;
OLD_CHECK_DISPLAY_AS_DATA(proto_isis_hello, pd, offset, fd, tree);
if (hello_type == ISIS_TYPE_PTP_HELLO) {
hlen = 1+id_length+2+2+1;
} else {
hlen = 1+id_length+2+2+1+id_length+1;
}
if (!BYTES_ARE_IN_FRAME(offset, hlen)) {
isis_dissect_unknown(offset, hlen, tree, fd,
"not enough capture data for header (%d vs %d)",
hlen, END_OF_FRAME);
return;
}
if (tree) {
ti = proto_tree_add_item(tree, proto_isis_hello, NullTVB,
offset, END_OF_FRAME, FALSE);
hello_tree = proto_item_add_subtree(ti, ett_isis_hello);
proto_tree_add_uint_format(hello_tree,
hf_isis_hello_circuit_reserved,
NullTVB, offset, 1, pd[offset],
"Circuit type : %s, reserved(0x%02x == 0)",
val_to_str(pd[offset]&ISIS_HELLO_CTYPE_MASK,
isis_hello_circuit_type_vals,
"Unknown (0x%x)"),
pd[offset]&ISIS_HELLO_CT_RESERVED_MASK
);
}
offset += 1;
if (tree) {
proto_tree_add_bytes_format(hello_tree, hf_isis_hello_source_id, NullTVB,
offset, id_length, &pd[offset],
"SystemID{ Sender of PDU } : %s",
print_system_id( pd + offset, id_length ) );
}
offset += id_length;
if (tree) {
proto_tree_add_uint(hello_tree, hf_isis_hello_holding_timer, NullTVB,
offset, 2, pntohs(&pd[offset]));
}
offset += 2;
pdu_length = pntohs(&pd[offset]);
if (tree) {
proto_tree_add_uint(hello_tree, hf_isis_hello_pdu_length, NullTVB,
offset, 2, pdu_length);
}
offset += 2;
if (tree) {
proto_tree_add_uint_format(hello_tree, hf_isis_hello_priority_reserved, NullTVB,
offset, 1, pd[offset],
"Priority : %d, reserved(0x%02x == 0)",
pd[offset]&ISIS_HELLO_PRIORITY_MASK,
pd[offset]&ISIS_HELLO_P_RESERVED_MASK );
}
offset += 1;
if (hello_type == ISIS_TYPE_PTP_HELLO) {
if (tree) {
proto_tree_add_uint(hello_tree, hf_isis_hello_local_circuit_id, NullTVB,
offset, 1, pd[offset] );
}
offset += 1;
} else {
if (tree) {
proto_tree_add_bytes_format(hello_tree, hf_isis_hello_lan_id, NullTVB,
offset, id_length + 1, &pd[offset],
"SystemID{ Designated IS } : %s",
print_system_id( pd + offset, id_length + 1 ) );
}
offset += id_length + 1;
}
len = pdu_length;
len -= header_length;
if (len < 0) {
isis_dissect_unknown(offset, header_length, tree, fd,
"packet header length %d went beyond packet",
header_length );
return;
}
/*
* Now, we need to decode our CLVs. We need to pass in
* our list of valid ones!
*/
if (hello_type == ISIS_TYPE_L1_HELLO){
isis_dissect_clvs ( clv_l1_hello_opts, len, id_length, pd,
offset, fd, hello_tree, ett_isis_hello_clv_unknown );
} else if (hello_type == ISIS_TYPE_L2_HELLO) {
isis_dissect_clvs ( clv_l2_hello_opts, len, id_length, pd,
offset, fd, hello_tree, ett_isis_hello_clv_unknown );
} else {
isis_dissect_clvs ( clv_ptp_hello_opts, len, id_length, pd,
offset, fd, hello_tree, ett_isis_hello_clv_unknown );
}
}
/*
* Name: proto_register_isis_hello()
*
* Description:
* Register our protocol sub-sets with protocol manager.
* NOTE: this procedure is autolinked by the makefile process that
* builds register.c
*
* Input:
* void
*
* Output:
* void
*/
void
proto_register_isis_hello(void) {
static hf_register_info hf[] = {
{ &hf_isis_hello_circuit_reserved,
{ "Circuit type ", "isis_hello.circuite_type",
FT_UINT8, BASE_HEX, NULL, 0x0, "" }},
{ &hf_isis_hello_source_id,
{ "SystemID{ Sender of PDU } ", "isis_hello.source_id",
FT_BYTES, BASE_HEX, NULL, 0x0, "" }},
{ &hf_isis_hello_holding_timer,
{ "Holding timer ", "isis_hello.holding_timer",
FT_UINT16, BASE_DEC, NULL, 0x0, "" }},
{ &hf_isis_hello_pdu_length,
{ "PDU length ", "isis_hello.pdu_length",
FT_UINT16, BASE_DEC, NULL, 0x0, "" }},
{ &hf_isis_hello_priority_reserved,
{ "Priority ", "isis_hello.priority",
FT_UINT8, BASE_DEC, NULL, ISIS_HELLO_P_RESERVED_MASK, "" }},
{ &hf_isis_hello_lan_id,
{ "SystemID{ Designated IS } ", "isis_hello.lan_id",
FT_BYTES, BASE_DEC, NULL, 0x0, "" }},
{ &hf_isis_hello_local_circuit_id,
{ "Local circuit ID ", "isis_hello.local_circuit_id",
FT_UINT8, BASE_DEC, NULL, 0x0, "" }},
{ &hf_isis_hello_clv_ipv4_int_addr,
{ "IPv4 interface address ", "isis_hello.clv_ipv4_int_addr",
FT_IPv4, BASE_NONE, NULL, 0x0, "" }},
};
static gint *ett[] = {
&ett_isis_hello,
&ett_isis_hello_clv_area_addr,
&ett_isis_hello_clv_is_neighbors,
&ett_isis_hello_clv_padding,
&ett_isis_hello_clv_unknown,
&ett_isis_hello_clv_nlpid,
&ett_isis_hello_clv_auth,
&ett_isis_hello_clv_ipv4_int_addr,
};
proto_isis_hello = proto_register_protocol("ISIS HELLO", "isis_hello");
proto_register_field_array(proto_isis_hello, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
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