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/* packet-snaeth.c
* Routines for SNA-over-Ethernet (Ethernet type 80d5)
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/etypes.h>
/*
* See
*
* http://www.cisco.com/univercd/cc/td/doc/product/software/ssr90/rpc_r/18059.pdf
*/
void proto_register_snaeth(void);
void proto_reg_handoff_snaeth(void);
static int proto_snaeth;
static int hf_snaeth_len;
static int hf_snaeth_padding;
static int ett_snaeth;
static dissector_handle_t llc_handle;
static dissector_handle_t snaeth_handle;
static int
dissect_snaeth(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *snaeth_tree;
proto_item *snaeth_ti;
uint16_t len;
tvbuff_t *next_tvb;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "SNAETH");
col_set_str(pinfo->cinfo, COL_INFO, "SNA over Ethernet");
/* length */
len = tvb_get_ntohs(tvb, 0);
if (tree) {
snaeth_ti = proto_tree_add_item(tree, proto_snaeth, tvb, 0, 3,
ENC_NA);
snaeth_tree = proto_item_add_subtree(snaeth_ti, ett_snaeth);
proto_tree_add_uint(snaeth_tree, hf_snaeth_len, tvb, 0, 2, len);
proto_tree_add_item(snaeth_tree, hf_snaeth_padding, tvb, 2, 1, ENC_BIG_ENDIAN);
}
/*
* Adjust the length of this tvbuff to include only the SNA-over-
* Ethernet header and data.
*/
set_actual_length(tvb, 3 + len);
/*
* Rest of packet starts with an 802.2 LLC header.
*/
next_tvb = tvb_new_subset_remaining(tvb, 3);
call_dissector(llc_handle, next_tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
void
proto_register_snaeth(void)
{
static hf_register_info hf[] = {
{ &hf_snaeth_len,
{ "Length", "snaeth.len", FT_UINT16, BASE_DEC, NULL, 0x0,
"Length of LLC payload", HFILL }},
{ &hf_snaeth_padding,
{ "Padding", "snaeth.padding", FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
};
static int *ett[] = {
&ett_snaeth,
};
proto_snaeth = proto_register_protocol("SNA-over-Ethernet",
"SNAETH", "snaeth");
proto_register_field_array(proto_snaeth, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
snaeth_handle = register_dissector("snaeth", dissect_snaeth, proto_snaeth);
}
void
proto_reg_handoff_snaeth(void)
{
/*
* Get handle for the LLC dissector.
*/
llc_handle = find_dissector_add_dependency("llc", proto_snaeth);
dissector_add_uint("ethertype", ETHERTYPE_SNA, snaeth_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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