/*
* 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
* 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 (tree) {
ti = proto_tree_add_text(tree, tvb, offset, -1,
PROTO_STRING_PSNP);
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 ) );
}
if (check_col(pinfo->cinfo, COL_INFO)) {
col_append_fstr(pinfo->cinfo, COL_INFO, ", 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, tree, offset,
"packet header length %d went beyond packet",
header_length );
return;
}
/* Call into payload dissector */
if (type == ISIS_TYPE_L1_PSNP ) {
isis_dissect_clvs(tvb, psnp_tree, offset,
clv_l1_psnp_opts, len, id_length,
ett_isis_psnp_clv_unknown );
} else {
isis_dissect_clvs(tvb, psnp_tree, offset,
clv_l2_psnp_opts, len, id_length,
ett_isis_psnp_clv_unknown );
}
}
/*
* 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:
* tvbuff_t * : tvbuffer for packet data
* proto_tree * : protocol display tree to add to. May be NULL.
* int offset : our offset into packet data.
* int : hello type, a la packet-isis.h ISIS_TYPE_* values
* int : header length of packet.
* int : length of IDs in packet.
*
* Output:
* void, will modify proto_tree if not NULL.
*/
void
isis_dissect_isis_hello(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset,
int hello_type, int header_length, int id_length)
{
proto_item *ti;
proto_tree *hello_tree = NULL;
int len;
guint8 octet;
const guint8 *source_id;
guint16 pdu_length;
const guint8 *lan_id;
if (tree) {
ti = proto_tree_add_text(tree, tvb, offset, -1, "ISIS HELLO");
hello_tree = proto_item_add_subtree(ti, ett_isis_hello);
octet = tvb_get_guint8(tvb, offset);
proto_tree_add_uint_format(hello_tree,
hf_isis_hello_circuit_reserved,
tvb, offset, 1, octet,
"Circuit type : %s, reserved(0x%02x == 0)",
val_to_str(octet&ISIS_HELLO_CTYPE_MASK,
isis_hello_circuit_type_vals,
"Unknown (0x%x)"),
octet&ISIS_HELLO_CT_RESERVED_MASK
);
}
offset += 1;
if (tree) {
source_id = tvb_get_ptr(tvb, offset, id_length);
proto_tree_add_bytes_format(hello_tree, hf_isis_hello_source_id, tvb,
offset, id_length, source_id,
"System-ID {Sender of PDU} : %s",
print_system_id( source_id, id_length ) );
}
if (check_col(pinfo->cinfo, COL_INFO)) {
col_append_fstr(pinfo->cinfo, COL_INFO, ", System-ID: %s",
print_system_id( tvb_get_ptr(tvb, offset, id_length), id_length ) );
}
offset += id_length;
if (tree) {
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);
if (tree) {
proto_tree_add_uint(hello_tree, hf_isis_hello_pdu_length, tvb,
offset, 2, pdu_length);
}
offset += 2;
if (hello_type == ISIS_TYPE_PTP_HELLO) {
if (tree) {
proto_tree_add_item(hello_tree, hf_isis_hello_local_circuit_id, tvb,
offset, 1, ENC_BIG_ENDIAN );
}
offset += 1;
} else {
if (tree) {
octet = tvb_get_guint8(tvb, offset);
proto_tree_add_uint_format(hello_tree, hf_isis_hello_priority_reserved, tvb,
offset, 1, octet,
"Priority : %d, reserved(0x%02x == 0)",
octet&ISIS_HELLO_PRIORITY_MASK,
octet&ISIS_HELLO_P_RESERVED_MASK );
}
offset += 1;
if (tree) {
lan_id = tvb_get_ptr(tvb, offset, id_length+1);
proto_tree_add_bytes_format(hello_tree, hf_isis_hello_lan_id, tvb,
offset, id_length + 1, lan_id,
"System-ID {Designated IS} : %s",
print_system_id( lan_id, id_length + 1 ) );
}
offset += id_length + 1;
}
len = pdu_length;
len -= header_length;
if (len < 0) {
isis_dissect_unknown(tvb, tree, offset,
"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(tvb, hello_tree, offset,
clv_l1_hello_opts, len, id_length,
ett_isis_hello_clv_unknown);
} else if (hello_type == ISIS_TYPE_L2_HELLO) {
isis_dissect_clvs(tvb, hello_tree, offset,
clv_l2_hello_opts, len, id_length,
ett_isis_hello_clv_unknown);
} else {
isis_dissect_clvs(tvb, hello_tree, offset,
clv_ptp_hello_opts, len, id_length,
ett_isis_hello_clv_unknown);
}
}
/*
* 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
* 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 (tree) {
ti = proto_tree_add_text(tree, tvb, offset, -1,
PROTO_STRING_CSNP);
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 ) );
}
col_append_fstr(pinfo->cinfo, COL_INFO, ", Source-ID: %s",
print_system_id( tvb_get_ptr(tvb, offset, id_length+1), id_length+1 ) );
offset += id_length + 1;
proto_tree_add_text(csnp_tree, tvb, offset, id_length + 2, "Start LSP-ID: %s",
print_system_id( tvb_get_ptr(tvb, offset, id_length+2), id_length+2 ) );
col_append_fstr(pinfo->cinfo, COL_INFO, ", Start LSP-ID: %s",
print_system_id( tvb_get_ptr(tvb, offset, id_length+2), id_length+2 ) );
offset += id_length + 2;
proto_tree_add_text(csnp_tree, tvb, offset, id_length + 2, "End LSP-ID: %s",
print_system_id( tvb_get_ptr(tvb, offset, id_length+2), id_length+2 ) );
col_append_fstr(pinfo->cinfo, COL_INFO, ", End LSP-ID: %s",
print_system_id( tvb_get_ptr(tvb, offset, id_length+2), id_length+2 ) );
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, csnp_tree, offset,
clv_l1_csnp_opts, len, id_length,
ett_isis_csnp_clv_unknown );
} else {
isis_dissect_clvs(tvb, csnp_tree, offset,
clv_l2_csnp_opts, len, id_length,
ett_isis_csnp_clv_unknown );
}
}
