115 lines
2.7 KiB
C
115 lines
2.7 KiB
C
/* packet-snaeth.c
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* Routines for SNA-over-Ethernet (Ethernet type 80d5)
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/etypes.h>
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/*
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* See
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*
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* http://www.cisco.com/univercd/cc/td/doc/product/software/ssr90/rpc_r/18059.pdf
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*/
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void proto_register_snaeth(void);
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void proto_reg_handoff_snaeth(void);
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static int proto_snaeth = -1;
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static int hf_snaeth_len = -1;
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static int hf_snaeth_padding = -1;
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static gint ett_snaeth = -1;
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static dissector_handle_t llc_handle;
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static int
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dissect_snaeth(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_tree *snaeth_tree;
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proto_item *snaeth_ti;
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guint16 len;
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tvbuff_t *next_tvb;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "SNAETH");
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col_set_str(pinfo->cinfo, COL_INFO, "SNA over Ethernet");
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/* length */
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len = tvb_get_ntohs(tvb, 0);
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if (tree) {
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snaeth_ti = proto_tree_add_item(tree, proto_snaeth, tvb, 0, 3,
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ENC_NA);
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snaeth_tree = proto_item_add_subtree(snaeth_ti, ett_snaeth);
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proto_tree_add_uint(snaeth_tree, hf_snaeth_len, tvb, 0, 2, len);
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proto_tree_add_item(snaeth_tree, hf_snaeth_padding, tvb, 2, 1, ENC_BIG_ENDIAN);
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}
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/*
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* Adjust the length of this tvbuff to include only the SNA-over-
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* Ethernet header and data.
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*/
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set_actual_length(tvb, 3 + len);
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/*
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* Rest of packet starts with an 802.2 LLC header.
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*/
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next_tvb = tvb_new_subset_remaining(tvb, 3);
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call_dissector(llc_handle, next_tvb, pinfo, tree);
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return tvb_captured_length(tvb);
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}
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void
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proto_register_snaeth(void)
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{
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static hf_register_info hf[] = {
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{ &hf_snaeth_len,
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{ "Length", "snaeth.len", FT_UINT16, BASE_DEC, NULL, 0x0,
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"Length of LLC payload", HFILL }},
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{ &hf_snaeth_padding,
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{ "Padding", "snaeth.padding", FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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};
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static gint *ett[] = {
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&ett_snaeth,
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};
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proto_snaeth = proto_register_protocol("SNA-over-Ethernet",
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"SNAETH", "snaeth");
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proto_register_field_array(proto_snaeth, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_snaeth(void)
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{
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dissector_handle_t snaeth_handle;
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/*
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* Get handle for the LLC dissector.
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*/
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llc_handle = find_dissector_add_dependency("llc", proto_snaeth);
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snaeth_handle = create_dissector_handle(dissect_snaeth, proto_snaeth);
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dissector_add_uint("ethertype", ETHERTYPE_SNA, snaeth_handle);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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