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wireshark/epan/dissectors/packet-isis-hello.c

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/* packet-isis-hello.c
* Routines for decoding isis hello packets and their CLVs
*
* Stuart Stanley <stuarts@mxmail.net>
*
* 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 <glib.h>
#include <epan/packet.h>
#include <epan/expert.h>
#include "packet-osi.h"
#include "packet-isis.h"
#include "packet-isis-clv.h"
#include <epan/addr_resolv.h>
/*
* Declarations for L1/L2 hello base header.
*/
#define ISIS_HELLO_CTYPE_MASK 0x03
#define ISIS_HELLO_CT_RESERVED_MASK 0xfc
#define ISIS_HELLO_PRIORITY_MASK 0x7f
#define ISIS_HELLO_P_RESERVED_MASK 0x80
#define ISIS_HELLO_TYPE_RESERVED 0
#define ISIS_HELLO_TYPE_LEVEL_1 1
#define ISIS_HELLO_TYPE_LEVEL_2 2
#define ISIS_HELLO_TYPE_LEVEL_12 3
/*
* misc. bittest macros
*/
#define ISIS_RESTART_RR 0x01
#define ISIS_RESTART_RA 0x02
#define ISIS_RESTART_SA 0x04
#define ISIS_MASK_RESTART_RR(x) ((x)&ISIS_RESTART_RR)
#define ISIS_MASK_RESTART_RA(x) ((x)&ISIS_RESTART_RA)
#define ISIS_MASK_RESTART_SA(x) ((x)&ISIS_RESTART_SA)
#define APPEND_BOOLEAN_FLAG(flag, item, string) \
if(flag){ \
if(item) \
proto_item_append_text(item, string, sep); \
sep = cont_sep; \
}
static const char initial_sep[] = " (";
static const char cont_sep[] = ", ";
void proto_register_isis_hello(void);
void proto_reg_handoff_isis_hello(void);
static int proto_isis_hello = -1;
/* hello packets */
static int hf_isis_hello_circuit = -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 = -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 int hf_isis_hello_clv_ipv6_int_addr = -1;
/* static int hf_isis_hello_clv_ptp_adj = -1; */
static int hf_isis_hello_clv_mt = -1;
static int hf_isis_hello_clv_restart_flags = -1;
static int hf_isis_hello_clv_restart_flags_rr = -1;
static int hf_isis_hello_clv_restart_flags_ra = -1;
static int hf_isis_hello_clv_restart_flags_sa = -1;
static int hf_isis_hello_clv_restart_remain_time = -1;
static int hf_isis_hello_clv_restart_neighbor = -1;
/* Generated from convert_proto_tree_add_text.pl */
static int hf_isis_hello_extended_local_circuit_id = -1;
static int hf_isis_hello_adjacency_state = -1;
static int hf_isis_hello_neighbor_systemid = -1;
static int hf_isis_hello_digest = -1;
static int hf_isis_hello_aux_mcid = -1;
static int hf_isis_hello_mcid = -1;
static int hf_isis_hello_is_neighbor = -1;
static int hf_isis_hello_mtid = -1;
static int hf_isis_hello_checksum = -1;
static int hf_isis_hello_neighbor_extended_local_circuit_id = -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_authentication = -1;
static gint ett_isis_hello_clv_ip_authentication = -1;
static gint ett_isis_hello_clv_ipv4_int_addr = -1;
static gint ett_isis_hello_clv_ipv6_int_addr = -1;
static gint ett_isis_hello_clv_ptp_adj = -1;
static gint ett_isis_hello_clv_mt = -1;
static gint ett_isis_hello_clv_restart = -1;
static gint ett_isis_hello_clv_restart_flags = -1;
static gint ett_isis_hello_clv_mt_port_cap = -1;
static gint ett_isis_hello_clv_mt_port_cap_spb_mcid = -1;
static gint ett_isis_hello_clv_mt_port_cap_spb_aux_mcid = -1;
static gint ett_isis_hello_clv_mt_port_cap_spb_digest = -1;
static gint ett_isis_hello_clv_mt_port_cap_spb_bvid_tuples = -1;
static gint ett_isis_hello_clv_checksum = -1;
static expert_field ei_isis_hello_short_packet = EI_INIT;
static expert_field ei_isis_hello_long_packet = EI_INIT;
static expert_field ei_isis_hello_subtlv = EI_INIT;
static expert_field ei_isis_hello_authentication = EI_INIT;
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} };
static void
dissect_hello_mt_port_cap_spb_mcid_clv(tvbuff_t *tvb, packet_info* pinfo,
proto_tree *tree, int offset, int subtype, int sublen)
{
const int MCID_LEN = 51;
const int SUBLEN = 2 * MCID_LEN;
proto_tree *subtree, *ti;
if (sublen != SUBLEN) {
proto_tree_add_expert_format(tree, pinfo, &ei_isis_hello_short_packet, tvb, offset, -1,
"Short SPB MCID TLV (%d vs %d)", sublen, SUBLEN);
return;
}
ti = proto_tree_add_text( tree, tvb, offset-2, sublen+2,
"SPB MCID: Type: 0x%02x, Length: %d", subtype, sublen);
subtree = proto_item_add_subtree(ti, ett_isis_hello_clv_mt_port_cap_spb_mcid);
/* MCID: */
proto_tree_add_item(subtree, hf_isis_hello_mcid, tvb, offset, MCID_LEN, ENC_NA);
offset += MCID_LEN;
/* Aux MCID: */
proto_tree_add_item(subtree, hf_isis_hello_aux_mcid, tvb, offset, MCID_LEN, ENC_NA);
/* offset += MCID_LEN; */
}
static void
dissect_hello_mt_port_cap_spb_digest_clv(tvbuff_t *tvb, packet_info* pinfo,
proto_tree *tree, int offset, int subtype, int sublen)
{
const int DIGEST_LEN = 32;
const int SUBLEN = 1 + DIGEST_LEN;
if (sublen != SUBLEN) {
proto_tree_add_expert_format(tree, pinfo, &ei_isis_hello_short_packet, tvb, offset, -1,
"Short SPB Digest TLV (%d vs %d)", sublen, SUBLEN);
return;
}
else {
proto_tree *subtree, *ti;
const guint8 vad = tvb_get_guint8(tvb, offset);
ti = proto_tree_add_text( tree, tvb, offset-2, sublen+2,
"SPB Digest: Type: 0x%02x, Length: %d", subtype, sublen);
subtree = proto_item_add_subtree(ti, ett_isis_hello_clv_mt_port_cap_spb_digest);
proto_tree_add_text( subtree, tvb, offset, 1,
"V: %d, A: %d, D: %d",
(vad >> 4) & 0x1,
(vad >> 2) & 0x3,
(vad >> 0) & 0x3);
++offset;
/* Digest: */
proto_tree_add_item(subtree, hf_isis_hello_digest, tvb, offset, DIGEST_LEN, ENC_NA);
/* offset += DIGEST_LEN; */
}
}
static void
dissect_hello_mt_port_cap_spb_bvid_tuples_clv(tvbuff_t *tvb, packet_info* pinfo,
proto_tree *tree, int offset, int subtype, int sublen)
{
proto_tree *subtree, *ti;
int subofs = offset;
ti = proto_tree_add_text( tree, tvb, offset-2, sublen+2,
"SPB Base Vlan Identifiers: Type: 0x%02x, Length: %d", subtype, sublen);
subtree = proto_item_add_subtree(ti, ett_isis_hello_clv_mt_port_cap_spb_bvid_tuples);
while (sublen > 0) {
if (sublen < 6) {
proto_tree_add_expert_format(tree, pinfo, &ei_isis_hello_short_packet, tvb, offset, -1,
"Short SPB BVID header entry (%d vs %d)", sublen, 6);
return;
}
else {
const guint8 *ect_tlv = tvb_get_ptr(tvb, subofs, 6);
guint16 word = (ect_tlv[4] << 8) | ect_tlv[5];
guint16 bvid = (word >> 4) & 0xfff;
int u_bit = (ect_tlv[5] & 8) ? 1 : 0;
int m_bit = (ect_tlv[5] & 4) ? 1 : 0;
proto_tree_add_text( subtree, tvb, subofs, 6,
"ECT: %02x-%02x-%02x-%02x, BVID: 0x%03x (%d),%s U: %d, M: %d",
ect_tlv[0], ect_tlv[1], ect_tlv[2], ect_tlv[3],
bvid, bvid,
( bvid < 10 ? " "
: bvid < 100 ? " "
: bvid < 1000 ? " "
: ""),
u_bit,
m_bit);
}
sublen -= 6;
subofs += 6;
}
}
static void
dissect_hello_mt_port_cap_clv(tvbuff_t *tvb, packet_info* pinfo,
proto_tree *tree, int offset, int id_length _U_, int length)
{
if (length >= 2) {
/* mtid */
proto_tree_add_item(tree, hf_isis_hello_mtid, tvb, offset, 2, ENC_BIG_ENDIAN);
length -= 2;
offset += 2;
while (length >= 2) {
guint8 subtype = tvb_get_guint8(tvb, offset);
guint8 subtlvlen = tvb_get_guint8(tvb, offset+1);
length -= 2;
offset += 2;
if (subtlvlen > length) {
proto_tree_add_expert_format(tree, pinfo, &ei_isis_hello_short_packet, tvb, offset, -1,
"Short type 0x%02x TLV (%d vs %d)", subtype, subtlvlen, length);
return;
}
if (subtype == 0x04) { /* SPB MCID */
dissect_hello_mt_port_cap_spb_mcid_clv(tvb, pinfo, tree, offset, subtype, subtlvlen);
}
else if (subtype == 0x05) { /* SPB Digest */
dissect_hello_mt_port_cap_spb_digest_clv(tvb, pinfo, tree, offset, subtype, subtlvlen);
}
else if (subtype == 0x06) { /* SPB BVID Tuples */
dissect_hello_mt_port_cap_spb_bvid_tuples_clv(tvb, pinfo, tree, offset, subtype, subtlvlen);
}
else {
proto_tree_add_expert_format(tree, pinfo, &ei_isis_hello_subtlv, tvb, offset, -1,
"Unknown SubTlv: Type: 0x%02x, Length: %d", subtype, subtlvlen );
}
length -= subtlvlen;
offset += subtlvlen;
}
}
}
/*
* The Restart CLV is documented in RFC 3847 (Restart Signaling for
* Intermediate System to Intermediate System). The CLV looks like this
*
* Type 211
* Length # of octets in the value field (1 to (3 + ID Length))
* Value
*
* No. of octets
* +-----------------------+
* | Flags | 1
* +-----------------------+
* | Remaining Time | 2
* +-----------------------+
* | Restarting Neighbor ID| ID Length
* +-----------------------+
*
* Flags (1 octet)
*
* 0 1 2 3 4 5 6 7
* +--+--+--+--+--+--+--+--+
* | Reserved |SA|RA|RR|
* +--+--+--+--+--+--+--+--+
*
* RR - Restart Request
* RA - Restart Acknowledgement
* SA - Suppress adjacency advertisement
*
* The Remaining Time and Restarting Neighbor ID fields are only required when
* the RA flag is set. The Flags field is always required.
*
*/
/*
* Name: dissect_hello_restart_clv()
*
* Description:
* Decode for a restart clv - only found in IIHs
* hence no call in the common clv dissector
*
*/
static void
dissect_hello_restart_clv(tvbuff_t *tvb, packet_info* pinfo _U_,
proto_tree *tree, int offset, int id_length, int length)
{
int restart_options=0;
proto_tree *flags_tree;
proto_item *restart_flags_item;
proto_item *hold_time_item;
const char *sep;
if (length >= 1) {
restart_options = tvb_get_guint8(tvb, offset);
restart_flags_item = proto_tree_add_uint ( tree, hf_isis_hello_clv_restart_flags,
tvb, offset, 1, restart_options);
flags_tree = proto_item_add_subtree(restart_flags_item, ett_isis_hello_clv_restart_flags);
proto_tree_add_boolean (flags_tree, hf_isis_hello_clv_restart_flags_sa,
tvb, offset, 1, restart_options );
proto_tree_add_boolean (flags_tree, hf_isis_hello_clv_restart_flags_ra,
tvb, offset, 1, restart_options );
proto_tree_add_boolean (flags_tree, hf_isis_hello_clv_restart_flags_rr,
tvb, offset, 1, restart_options );
/* Append an indication of which flags are set in the restart
* options
*/
sep = initial_sep;
APPEND_BOOLEAN_FLAG(ISIS_MASK_RESTART_SA(restart_options), restart_flags_item, "%sSA");
APPEND_BOOLEAN_FLAG(ISIS_MASK_RESTART_RA(restart_options), restart_flags_item, "%sRA");
APPEND_BOOLEAN_FLAG(ISIS_MASK_RESTART_RR(restart_options), restart_flags_item, "%sRR");
if (sep != initial_sep)
{
proto_item_append_text (restart_flags_item, ")");
}
}
/* The Remaining Time field should only be present if the RA flag is
* set
*/
if (length >= 3 && ISIS_MASK_RESTART_RA(restart_options)) {
hold_time_item = proto_tree_add_item( tree, hf_isis_hello_clv_restart_remain_time,
tvb, offset+1, 2, ENC_BIG_ENDIAN );
proto_item_append_text( hold_time_item, "s" );
}
/* The Restarting Neighbor ID should only be present if the RA flag is
* set.
*/
if (length >= 3 + id_length && ISIS_MASK_RESTART_RA(restart_options)) {
proto_tree_add_item( tree, hf_isis_hello_clv_restart_neighbor, tvb, offset+3, id_length, ENC_NA);
}
}
/*
* Name: dissect_hello_nlpid_clv()
*
* Description:
* Decode for a hello packets NLPID clv. Calls into the
* clv common one.
*
* Input:
* tvbuff_t * : tvbuffer for packet data
* 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_hello_nlpid_clv(tvbuff_t *tvb, packet_info* pinfo _U_,
proto_tree *tree, int offset, int id_length _U_, int length)
{
isis_dissect_nlpid_clv(tvb, tree, offset, length);
}
/*
* Name: dissect_hello_mt_clv()
*
* Description:
* Decode for a hello packets Multi Topology clv. Calls into the
* clv common one.
*
* Input:
* tvbuff_t * : tvbuffer for packet data
* 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_hello_mt_clv(tvbuff_t *tvb, packet_info* pinfo _U_,
proto_tree *tree, int offset, int id_length _U_, int length)
{
isis_dissect_mt_clv(tvb, tree, offset, length,
hf_isis_hello_clv_mt );
}
/*
* Name: dissect_hello_ip_int_addr_clv()
*
* Description:
* Decode for a hello packets ip interface addr clv. Calls into the
* clv common one.
*
* Input:
* tvbuff_t * : tvbuffer for packet data
* 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_hello_ip_int_addr_clv(tvbuff_t *tvb, packet_info* pinfo,
proto_tree *tree, int offset, int id_length _U_, int length)
{
isis_dissect_ip_int_clv(tree, pinfo, tvb, &ei_isis_hello_short_packet,
offset, length, hf_isis_hello_clv_ipv4_int_addr );
}
/*
* Name: dissect_hello_ipv6_int_addr_clv()
*
* Description:
* Decode for a hello packets ipv6 interface addr clv. Calls into the
* clv common one.
*
* Input:
* tvbuff_t * : tvbuffer for packet data
* 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_hello_ipv6_int_addr_clv(tvbuff_t *tvb, packet_info* pinfo,
proto_tree *tree, int offset, int id_length _U_, int length)
{
isis_dissect_ipv6_int_clv(tree, pinfo, tvb, &ei_isis_hello_short_packet,
offset, length, hf_isis_hello_clv_ipv6_int_addr );
}
/*
* Name: dissect_hello_authentication_clv()
*
* Description:
* Decode for a hello packets authenticaion clv.
* Calls into the CLV common one.
*
* Input:
* tvbuff_t * : tvbuffer for packet data
* 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_hello_authentication_clv(tvbuff_t *tvb, packet_info* pinfo,
proto_tree *tree, int offset, int id_length _U_, int length)
{
isis_dissect_authentication_clv(tree, pinfo, tvb, &ei_isis_hello_authentication, offset, length);
}
/*
* Name: dissect_hello_ip_authentication_clv()
*
* Description:
* Decode for a hello packets IP authenticaion clv.
* Calls into the CLV common one.
*
* Input:
* tvbuff_t * : tvbuffer for packet data
* 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_hello_ip_authentication_clv(tvbuff_t *tvb, packet_info* pinfo _U_,
proto_tree *tree, int offset, int id_length _U_, int length)
{
isis_dissect_ip_authentication_clv(tvb, tree, offset, length);
}
/*
* Name: dissect_hello_checksum_clv()
*
* Description:
* dump and verify the optional checksum in TLV 12
*
* Input:
* tvbuff_t * : tvbuffer for packet data
* proto_tree * : protocol display tree to fill out. May be NULL
* int : offset into packet data where we are.
* int : length of clv we are decoding
*
* Output:
* void, but we will add to proto tree if !NULL.
*/
static void
dissect_hello_checksum_clv(tvbuff_t *tvb, packet_info* pinfo,
proto_tree *tree, int offset, int id_length _U_, int length) {
guint16 pdu_length,checksum, cacl_checksum=0;
if (tree) {
if ( length != 2 ) {
proto_tree_add_text ( tree, tvb, offset, length,
"incorrect checksum length (%u), should be (2)", length );
return;
}
checksum = tvb_get_ntohs(tvb, offset);
/* the check_and_get_checksum() function needs to know how big
* the packet is. we can either pass through the pdu-len through several layers
* of dissectors and wrappers or extract the PDU length field from the PDU specific header
* which is offseted 17 bytes in IIHs (relative to the beginning of the IS-IS packet) */
pdu_length = tvb_get_ntohs(tvb, 17);
/* unlike the LSP checksum verification which starts at an offset of 12 we start at offset 0*/
switch (check_and_get_checksum(tvb, 0, pdu_length, checksum, offset, &cacl_checksum))
{
case NO_CKSUM :
proto_tree_add_uint_format_value( tree, hf_isis_hello_checksum, tvb, offset, length, checksum,
"0x%04x [unused]", checksum);
break;
case DATA_MISSING :
proto_tree_add_expert_format(tree, pinfo, &ei_isis_hello_long_packet, tvb, offset, -1,
"Packet length %d went beyond packet", tvb_length(tvb) );
break;
case CKSUM_NOT_OK :
proto_tree_add_uint_format_value( tree, hf_isis_hello_checksum, tvb, offset, length, checksum,
"0x%04x [incorrect, should be 0x%04x]",
checksum,
cacl_checksum);
break;
case CKSUM_OK :
proto_tree_add_uint_format_value( tree, hf_isis_hello_checksum, tvb, offset, length, checksum,
"0x%04x [correct]", checksum);
break;
default :
g_message("'check_and_get_checksum' returned an invalid value");
}
}
}
/*
* Name: dissect_hello_area_address_clv()
*
* Description:
* Decode for a hello packets area address clv.
* Calls into the CLV common one.
*
* Input:
* tvbuff_t * : tvbuffer for packet data
* 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_hello_area_address_clv(tvbuff_t *tvb, packet_info* pinfo _U_,
proto_tree *tree, int offset, int id_length _U_, int length)
{
isis_dissect_area_address_clv(tree, pinfo, tvb, &ei_isis_hello_short_packet, offset, length);
}
static const value_string adj_state_vals[] = {
{ 0, "Up" },
{ 1, "Initializing" },
{ 2, "Down" },
{ 0, NULL }
};
static void
dissect_hello_ptp_adj_clv(tvbuff_t *tvb, packet_info* pinfo,
proto_tree *tree, int offset, int id_length, int length)
{
switch(length)
{
case 1:
proto_tree_add_item(tree, hf_isis_hello_adjacency_state, tvb, offset, 1, ENC_NA);
break;
case 5:
proto_tree_add_item(tree, hf_isis_hello_adjacency_state, tvb, offset, 1, ENC_NA);
proto_tree_add_item(tree, hf_isis_hello_extended_local_circuit_id, tvb, offset+1, 4, ENC_BIG_ENDIAN);
break;
case 11:
proto_tree_add_item(tree, hf_isis_hello_adjacency_state, tvb, offset, 1, ENC_NA);
proto_tree_add_item(tree, hf_isis_hello_extended_local_circuit_id, tvb, offset+1, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(tree, hf_isis_hello_neighbor_systemid, tvb, offset+5, id_length, ENC_NA);
break;
case 15:
proto_tree_add_item(tree, hf_isis_hello_adjacency_state, tvb, offset, 1, ENC_NA);
proto_tree_add_item(tree, hf_isis_hello_extended_local_circuit_id, tvb, offset+1, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(tree, hf_isis_hello_neighbor_systemid, tvb, offset+5, id_length, ENC_NA);
proto_tree_add_item(tree, hf_isis_hello_neighbor_extended_local_circuit_id, tvb, offset+5+id_length, 4, ENC_BIG_ENDIAN);
break;
default:
proto_tree_add_expert_format(tree, pinfo, &ei_isis_hello_short_packet, tvb, offset, -1,
"malformed TLV (%d vs 1,5,11,15)", length );
}
}
/*
* 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 it's not required).
*
* Input:
* tvbuff_t * : tvbuffer for packet data
* proto_tree * : protocol display tree to fill out. May be NULL
* int : offset into packet data where we are.
* int : length of IDs in packet.
* int : length of clv we are decoding
*
* Output:
* void, but we will add to proto tree if !NULL.
*/
static void
dissect_hello_is_neighbors_clv(tvbuff_t *tvb, packet_info* pinfo, proto_tree *tree, int offset,
int id_length _U_, int length)
{
while ( length > 0 ) {
if (length<6) {
proto_tree_add_expert_format(tree, pinfo, &ei_isis_hello_short_packet, tvb, offset, -1,
"short is neighbor (%d vs 6)", length );
return;
}
/*
* Lets turn the area address into "standard" 0000.0000.etc
* format string.
*/
proto_tree_add_item(tree, hf_isis_hello_is_neighbor, tvb, offset, 6, ENC_NA);
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:
* tvbuff_t * : tvbuffer for packet data
* 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
*/
static void
dissect_hello_padding_clv(tvbuff_t *tvb _U_, packet_info* pinfo _U_, proto_tree *tree _U_, int offset _U_,
int id_length _U_, int length _U_)
{
/* nothing to do here! */
}
static const isis_clv_handle_t clv_l1_hello_opts[] = {
{
ISIS_CLV_AREA_ADDRESS,
"Area address(es)",
&ett_isis_hello_clv_area_addr,
dissect_hello_area_address_clv
},
{
ISIS_CLV_IS_NEIGHBORS,
"IS Neighbor(s)",
&ett_isis_hello_clv_is_neighbors,
dissect_hello_is_neighbors_clv
},
{
ISIS_CLV_PADDING,
"Padding",
&ett_isis_hello_clv_padding,
dissect_hello_padding_clv
},
{
ISIS_CLV_PROTOCOLS_SUPPORTED,
"Protocols Supported",
&ett_isis_hello_clv_nlpid,
dissect_hello_nlpid_clv
},
{
ISIS_CLV_IP_ADDR,
"IP Interface address(es)",
&ett_isis_hello_clv_ipv4_int_addr,
dissect_hello_ip_int_addr_clv
},
{
ISIS_CLV_IP6_ADDR,
"IPv6 Interface address(es)",
&ett_isis_hello_clv_ipv6_int_addr,
dissect_hello_ipv6_int_addr_clv
},
{
ISIS_CLV_RESTART,
"Restart Signaling",
&ett_isis_hello_clv_restart,
dissect_hello_restart_clv
},
{
ISIS_CLV_AUTHENTICATION,
"Authentication",
&ett_isis_hello_clv_authentication,
dissect_hello_authentication_clv
},
{
ISIS_CLV_IP_AUTHENTICATION,
"IP Authentication",
&ett_isis_hello_clv_ip_authentication,
dissect_hello_ip_authentication_clv
},
{
ISIS_CLV_MT_SUPPORTED,
"Multi Topology",
&ett_isis_hello_clv_mt,
dissect_hello_mt_clv
},
{
ISIS_CLV_CHECKSUM,
"Checksum",
&ett_isis_hello_clv_checksum,
dissect_hello_checksum_clv
},
{
0,
"",
NULL,
NULL
}
};
static const isis_clv_handle_t clv_l2_hello_opts[] = {
{
ISIS_CLV_AREA_ADDRESS,
"Area address(es)",
&ett_isis_hello_clv_area_addr,
dissect_hello_area_address_clv
},
{
ISIS_CLV_IS_NEIGHBORS,
"IS Neighbor(s)",
&ett_isis_hello_clv_is_neighbors,
dissect_hello_is_neighbors_clv
},
{
ISIS_CLV_PADDING,
"Padding",
&ett_isis_hello_clv_padding,
dissect_hello_padding_clv
},
{
ISIS_CLV_PROTOCOLS_SUPPORTED,
"Protocols Supported",
&ett_isis_hello_clv_nlpid,
dissect_hello_nlpid_clv
},
{
ISIS_CLV_IP_ADDR,
"IP Interface address(es)",
&ett_isis_hello_clv_ipv4_int_addr,
dissect_hello_ip_int_addr_clv
},
{
ISIS_CLV_IP6_ADDR,
"IPv6 Interface address(es)",
&ett_isis_hello_clv_ipv6_int_addr,
dissect_hello_ipv6_int_addr_clv
},
{
ISIS_CLV_AUTHENTICATION,
"Authentication",
&ett_isis_hello_clv_authentication,
dissect_hello_authentication_clv
},
{
ISIS_CLV_IP_AUTHENTICATION,
"IP Authentication",
&ett_isis_hello_clv_ip_authentication,
dissect_hello_ip_authentication_clv
},
{
ISIS_CLV_RESTART,
"Restart Signaling",
&ett_isis_hello_clv_restart,
dissect_hello_restart_clv
},
{
ISIS_CLV_MT_SUPPORTED,
"Multi Topology",
&ett_isis_hello_clv_mt,
dissect_hello_mt_clv
},
{
ISIS_CLV_CHECKSUM,
"Checksum",
&ett_isis_hello_clv_checksum,
dissect_hello_checksum_clv
},
{
0,
"",
NULL,
NULL
}
};
static const isis_clv_handle_t clv_ptp_hello_opts[] = {
{
ISIS_CLV_AREA_ADDRESS,
"Area address(es)",
&ett_isis_hello_clv_area_addr,
dissect_hello_area_address_clv
},
{
ISIS_CLV_PADDING,
"Padding",
&ett_isis_hello_clv_padding,
dissect_hello_padding_clv
},
{
ISIS_CLV_PROTOCOLS_SUPPORTED,
"Protocols Supported",
&ett_isis_hello_clv_nlpid,
dissect_hello_nlpid_clv
},
{
ISIS_CLV_IP_ADDR,
"IP Interface address(es)",
&ett_isis_hello_clv_ipv4_int_addr,
dissect_hello_ip_int_addr_clv
},
{
ISIS_CLV_IP6_ADDR,
"IPv6 Interface address(es)",
&ett_isis_hello_clv_ipv6_int_addr,
dissect_hello_ipv6_int_addr_clv
},
{
ISIS_CLV_AUTHENTICATION,
"Authentication",
&ett_isis_hello_clv_authentication,
dissect_hello_authentication_clv
},
{
ISIS_CLV_IP_AUTHENTICATION,
"IP Authentication",
&ett_isis_hello_clv_ip_authentication,
dissect_hello_ip_authentication_clv
},
{
ISIS_CLV_MT_PORT_CAP,
"MT Port Capability",
&ett_isis_hello_clv_mt_port_cap,
dissect_hello_mt_port_cap_clv
},
{
ISIS_CLV_RESTART,
"Restart Option",
&ett_isis_hello_clv_restart,
dissect_hello_restart_clv
},
{
ISIS_CLV_PTP_ADJ_STATE,
"Point-to-point Adjacency State",
&ett_isis_hello_clv_ptp_adj,
dissect_hello_ptp_adj_clv
},
{
ISIS_CLV_MT_SUPPORTED,
"Multi Topology",
&ett_isis_hello_clv_mt,
dissect_hello_mt_clv
},
{
ISIS_CLV_CHECKSUM,
"Checksum",
&ett_isis_hello_clv_checksum,
dissect_hello_checksum_clv
},
{
0,
"",
NULL,
NULL
}
};
/*
* 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.
*/
static void
dissect_isis_hello(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset,
const isis_clv_handle_t *opts, int header_length, int id_length)
{
proto_item *ti;
proto_tree *hello_tree;
int pdu_length;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISIS HELLO");
ti = proto_tree_add_item(tree, proto_isis_hello, tvb, offset, -1, ENC_NA);
hello_tree = proto_item_add_subtree(ti, ett_isis_hello);
proto_tree_add_item(hello_tree, hf_isis_hello_circuit, tvb, offset, 1, ENC_NA);
proto_tree_add_item(hello_tree, hf_isis_hello_circuit_reserved, tvb, offset, 1, ENC_NA);
offset += 1;
proto_tree_add_item(hello_tree, hf_isis_hello_source_id, tvb, offset, id_length, ENC_NA);
col_append_fstr(pinfo->cinfo, COL_INFO, ", System-ID: %s", tvb_print_system_id( tvb, offset, id_length ));
offset += id_length;
proto_tree_add_item(hello_tree, hf_isis_hello_holding_timer, tvb,
offset, 2, ENC_BIG_ENDIAN);
offset += 2;
pdu_length = tvb_get_ntohs(tvb, offset);
proto_tree_add_uint(hello_tree, hf_isis_hello_pdu_length, tvb,
offset, 2, pdu_length);
offset += 2;
if (opts == clv_ptp_hello_opts) {
proto_tree_add_item(hello_tree, hf_isis_hello_local_circuit_id, tvb,
offset, 1, ENC_BIG_ENDIAN );
offset += 1;
} else {
proto_tree_add_item(hello_tree, hf_isis_hello_priority, tvb, offset, 1, ENC_NA);
proto_tree_add_item(hello_tree, hf_isis_hello_priority_reserved, tvb, offset, 1, ENC_NA);
offset += 1;
proto_tree_add_item(hello_tree, hf_isis_hello_lan_id, tvb, offset, id_length + 1, ENC_NA);
offset += id_length + 1;
}
pdu_length -= header_length;
if (pdu_length < 0) {
expert_add_info_format(pinfo, ti, &ei_isis_hello_long_packet,
"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!
*/
isis_dissect_clvs(tvb, pinfo, hello_tree, offset,
opts, &ei_isis_hello_short_packet, pdu_length, id_length,
ett_isis_hello_clv_unknown);
}
static int
dissect_isis_l1_hello(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
{
isis_data_t* isis = (isis_data_t*)data;
dissect_isis_hello(tvb, pinfo, tree, 0,
clv_l1_hello_opts, isis->header_length, isis->system_id_len);
return tvb_length(tvb);
}
static int
dissect_isis_l2_hello(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
{
isis_data_t* isis = (isis_data_t*)data;
dissect_isis_hello(tvb, pinfo, tree, 0,
clv_l2_hello_opts, isis->header_length, isis->system_id_len);
return tvb_length(tvb);
}
static int
dissect_isis_ptp_hello(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
{
isis_data_t* isis = (isis_data_t*)data;
dissect_isis_hello(tvb, pinfo, tree, 0,
clv_ptp_hello_opts, isis->header_length, isis->system_id_len);
return tvb_length(tvb);
}
/*
* Name: isis_register_hello()
*
* Description:
* Register our protocol sub-sets with protocol manager.
*
* Input:
* int : protocol index for the ISIS protocol
*
* Output:
* void
*/
void
proto_register_isis_hello(void)
{
static hf_register_info hf[] = {
{ &hf_isis_hello_circuit,
{ "Circuit type", "isis.hello.circuit_type",
FT_UINT8, BASE_HEX, VALS(isis_hello_circuit_type_vals), ISIS_HELLO_CTYPE_MASK, NULL, HFILL }},
{ &hf_isis_hello_circuit_reserved,
{ "Reserved", "isis.hello.reserved",
FT_UINT8, BASE_HEX, NULL, ISIS_HELLO_CT_RESERVED_MASK, NULL, HFILL }},
{ &hf_isis_hello_source_id,
{ "SystemID {Sender of PDU}", "isis.hello.source_id",
FT_SYSTEM_ID, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_isis_hello_holding_timer,
{ "Holding timer", "isis.hello.holding_timer",
FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_isis_hello_pdu_length,
{ "PDU length", "isis.hello.pdu_length",
FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_isis_hello_priority,
{ "Priority", "isis.hello.priority",
FT_UINT8, BASE_DEC, NULL, ISIS_HELLO_PRIORITY_MASK, NULL, HFILL }},
{ &hf_isis_hello_priority_reserved,
{ "Reserved", "isis.hello.reserved",
FT_UINT8, BASE_DEC, NULL, ISIS_HELLO_P_RESERVED_MASK, NULL, HFILL }},
{ &hf_isis_hello_lan_id,
{ "SystemID {Designated IS}", "isis.hello.lan_id",
FT_SYSTEM_ID, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_isis_hello_local_circuit_id,
{ "Local circuit ID", "isis.hello.local_circuit_id",
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_isis_hello_clv_ipv4_int_addr,
{ "IPv4 interface address", "isis.hello.clv_ipv4_int_addr",
FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_isis_hello_clv_ipv6_int_addr,
{ "IPv6 interface address", "isis.hello.clv_ipv6_int_addr",
FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL }},
#if 0
{ &hf_isis_hello_clv_ptp_adj,
{ "Point-to-point Adjacency", "isis.hello.clv_ptp_adj",
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
#endif
{ &hf_isis_hello_clv_mt,
{ "MT-ID", "isis.hello.clv_mt",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_isis_hello_clv_restart_flags,
{ "Restart Signaling Flags", "isis.hello.clv_restart_flags",
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_isis_hello_clv_restart_flags_rr,
{ "Restart Request", "isis.hello.clv_restart_flags.rr",
FT_BOOLEAN, 8, TFS(&tfs_true_false), ISIS_RESTART_RR,
"When set, the router is beginning a graceful restart", HFILL }},
{ &hf_isis_hello_clv_restart_flags_ra,
{ "Restart Acknowledgment", "isis.hello.clv_restart_flags.ra",
FT_BOOLEAN, 8, TFS(&tfs_true_false), ISIS_RESTART_RA,
"When set, the router is willing to enter helper mode", HFILL }},
{ &hf_isis_hello_clv_restart_flags_sa,
{ "Suppress Adjacency", "isis.hello.clv_restart_flags.sa",
FT_BOOLEAN, 8, TFS(&tfs_true_false), ISIS_RESTART_SA,
"When set, the router is starting as opposed to restarting", HFILL }},
{ &hf_isis_hello_clv_restart_remain_time,
{ "Remaining holding time", "isis.hello.clv_restart.remain_time",
FT_UINT16, BASE_DEC, NULL, 0x0,
"How long the helper router will maintain the existing adjacency", HFILL }},
{ &hf_isis_hello_clv_restart_neighbor,
{ "Restarting Neighbor ID", "isis.hello.clv_restart.neighbor",
FT_SYSTEM_ID, BASE_NONE, NULL, 0x0,
"The System ID of the restarting neighbor", HFILL }},
/* Generated from convert_proto_tree_add_text.pl */
{ &hf_isis_hello_mcid, { "MCID", "isis.hello.mcid", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_isis_hello_aux_mcid, { "Aux MCID", "isis.hello.aux_mcid", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_isis_hello_digest, { "Digest", "isis.hello.digest", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_isis_hello_mtid, { "MTID", "isis.hello.mtid", FT_UINT16, BASE_HEX, NULL, 0xfff, NULL, HFILL }},
{ &hf_isis_hello_checksum, { "Checksum", "isis.hello.checksum", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_isis_hello_adjacency_state, { "Adjacency State", "isis.hello.adjacency_state", FT_UINT8, BASE_DEC, VALS(adj_state_vals), 0x0, NULL, HFILL }},
{ &hf_isis_hello_extended_local_circuit_id, { "Extended Local circuit ID", "isis.hello.extended_local_circuit_id", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_isis_hello_neighbor_systemid, { "Neighbor SystemID", "isis.hello.neighbor_systemid", FT_SYSTEM_ID, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_isis_hello_neighbor_extended_local_circuit_id, { "Neighbor Extended Local circuit ID", "isis.hello.neighbor_extended_local_circuit_id", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_isis_hello_is_neighbor, { "IS Neighbor", "isis.hello.is_neighbor", FT_ETHER, BASE_NONE, NULL, 0x0, NULL, HFILL }},
};
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_authentication,
&ett_isis_hello_clv_ip_authentication,
&ett_isis_hello_clv_ipv4_int_addr,
&ett_isis_hello_clv_ipv6_int_addr,
&ett_isis_hello_clv_ptp_adj,
&ett_isis_hello_clv_mt,
&ett_isis_hello_clv_restart,
&ett_isis_hello_clv_restart_flags,
&ett_isis_hello_clv_mt_port_cap,
&ett_isis_hello_clv_mt_port_cap_spb_mcid,
&ett_isis_hello_clv_mt_port_cap_spb_aux_mcid,
&ett_isis_hello_clv_mt_port_cap_spb_digest,
&ett_isis_hello_clv_mt_port_cap_spb_bvid_tuples,
&ett_isis_hello_clv_checksum
};
static ei_register_info ei[] = {
{ &ei_isis_hello_short_packet, { "isis.hello.short_packet", PI_MALFORMED, PI_ERROR, "Short packet", EXPFILL }},
{ &ei_isis_hello_long_packet, { "isis.hello.long_packet", PI_MALFORMED, PI_ERROR, "Long packet", EXPFILL }},
{ &ei_isis_hello_subtlv, { "isis.hello.subtlv.unknown", PI_PROTOCOL, PI_WARN, "Unknown SubTLV", EXPFILL }},
{ &ei_isis_hello_authentication, { "isis.hello.authentication.unknown", PI_PROTOCOL, PI_WARN, "Unknown authentication type", EXPFILL }},
};
expert_module_t* expert_isis_hello;
/* Register the protocol name and description */
proto_isis_hello = proto_register_protocol("ISIS HELLO", "ISIS HELLO", "isis.hello");
proto_register_field_array(proto_isis_hello, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_isis_hello = expert_register_protocol(proto_isis_hello);
expert_register_field_array(expert_isis_hello, ei, array_length(ei));
}
void
proto_reg_handoff_isis_hello(void)
{
dissector_add_uint("isis.type", ISIS_TYPE_L1_HELLO, new_create_dissector_handle(dissect_isis_l1_hello, proto_isis_hello));
dissector_add_uint("isis.type", ISIS_TYPE_L2_HELLO, new_create_dissector_handle(dissect_isis_l2_hello, proto_isis_hello));
dissector_add_uint("isis.type", ISIS_TYPE_PTP_HELLO, new_create_dissector_handle(dissect_isis_ptp_hello, proto_isis_hello));
}
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