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/* packet-ipfc.c
* Routines for Decoding Network_Header for IP-over-FC when we only
* capture the frame starting at the Network_Header (as opposed to
* when we have the full FC frame).
* See RFC 2625.
* Copyright 2001, Dinesh G Dutt <ddutt@cisco.com>
*
* 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/capture_dissectors.h>
#include <epan/to_str.h>
#include "packet-llc.h"
void proto_register_ipfc(void);
void proto_reg_handoff_ipfc(void);
static dissector_handle_t ipfc_handle;
static capture_dissector_handle_t ipfc_cap_handle;
/* Initialize the protocol and registered fields */
static int proto_ipfc;
static int hf_ipfc_network_da;
static int hf_ipfc_network_sa;
/* Initialize the subtree pointers */
static int ett_ipfc;
static dissector_handle_t llc_handle;
static capture_dissector_handle_t llc_cap_handle;
static bool
capture_ipfc (const unsigned char *pd, int offset _U_, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_)
{
if (!BYTES_ARE_IN_FRAME(0, len, 16))
return false;
return call_capture_dissector(llc_cap_handle, pd, 16, len, cpinfo, pseudo_header);
}
static int
dissect_ipfc (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *ti;
proto_tree *ipfc_tree;
int offset = 0;
tvbuff_t *next_tvb;
/* Make entries in Protocol column and Info column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "IP/FC");
if (tree) {
ti = proto_tree_add_protocol_format (tree, proto_ipfc, tvb, offset, 16,
"IP Over FC Network_Header");
ipfc_tree = proto_item_add_subtree (ti, ett_ipfc);
proto_tree_add_item (ipfc_tree, hf_ipfc_network_da, tvb, offset, 8, ENC_NA);
proto_tree_add_item (ipfc_tree, hf_ipfc_network_sa, tvb, offset+8, 8, ENC_NA);
}
next_tvb = tvb_new_subset_remaining (tvb, 16);
call_dissector(llc_handle, next_tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
/* Register the protocol with Wireshark */
/* this format is require because a script is used to build the C function
that calls all the protocol registration.
*/
void
proto_register_ipfc (void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{ &hf_ipfc_network_da,
{"Network DA", "ipfc.nh.da", FT_FCWWN, BASE_NONE, NULL,
0x0, NULL, HFILL}},
{ &hf_ipfc_network_sa,
{"Network SA", "ipfc.nh.sa", FT_FCWWN, BASE_NONE, NULL,
0x0, NULL, HFILL}},
};
/* Setup protocol subtree array */
static int *ett[] = {
&ett_ipfc,
};
/* Register the protocol name and description */
proto_ipfc = proto_register_protocol("IP Over FC", "IPFC", "ipfc");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_ipfc, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
ipfc_handle = register_dissector("ipfc", dissect_ipfc, proto_ipfc);
ipfc_cap_handle = register_capture_dissector("ipfc", capture_ipfc, proto_ipfc);
}
/* If this dissector uses sub-dissector registration add a registration routine.
This format is required because a script is used to find these routines and
create the code that calls these routines.
*/
void
proto_reg_handoff_ipfc (void)
{
dissector_add_uint("wtap_encap", WTAP_ENCAP_IP_OVER_FC, ipfc_handle);
llc_handle = find_dissector_add_dependency("llc", proto_ipfc);
llc_cap_handle = find_capture_dissector("llc");
capture_dissector_add_uint("wtap_encap", WTAP_ENCAP_IP_OVER_FC, ipfc_cap_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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