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/* packet-ieee802a.c
* Routines for IEEE 802a
*
* 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/addr_resolv.h>
#include <epan/etypes.h>
#include "packet-ieee802a.h"
void proto_register_ieee802a(void);
void proto_reg_handoff_ieee802a(void);
static dissector_handle_t ieee802a_handle;
static int proto_ieee802a = -1;
static int hf_ieee802a_oui = -1;
static int hf_ieee802a_pid = -1;
static gint ett_ieee802a = -1;
/*
* Hash table for translating OUIs to a dissector table/field info pair;
* the dissector table maps PID values to dissectors, and the field
* corresponds to the PID for that OUI.
*/
typedef struct {
dissector_table_t table;
hf_register_info *field_info;
} oui_info_t;
static GHashTable *oui_info_table = NULL;
/*
* Add an entry for a new OUI.
*/
void
ieee802a_add_oui(guint32 oui, const char *table_name, const char *table_ui_name,
hf_register_info *hf_item, const int proto)
{
oui_info_t *new_info;
new_info = g_new(oui_info_t, 1);
new_info->table = register_dissector_table(table_name,
table_ui_name, proto, FT_UINT16, BASE_HEX);
new_info->field_info = hf_item;
/*
* Create the hash table for OUI information, if it doesn't
* already exist.
*/
if (oui_info_table == NULL) {
oui_info_table = g_hash_table_new_full(g_direct_hash,
g_direct_equal, NULL, g_free);
}
g_hash_table_insert(oui_info_table, GUINT_TO_POINTER(oui), new_info);
}
static int
dissect_ieee802a(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *ieee802a_tree;
proto_item *ti;
tvbuff_t *next_tvb;
const gchar *manuf;
guint32 oui32;
guint16 pid;
oui_info_t *oui_info;
dissector_table_t subdissector_table;
int hf;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "IEEE802a");
col_clear(pinfo->cinfo, COL_INFO);
ti = proto_tree_add_item(tree, proto_ieee802a, tvb, 0, 5, ENC_NA);
ieee802a_tree = proto_item_add_subtree(ti, ett_ieee802a);
proto_tree_add_item_ret_uint(ieee802a_tree, hf_ieee802a_oui, tvb, 0, 3, ENC_BIG_ENDIAN, &oui32);
manuf = uint_get_manuf_name_if_known(oui32);
pid = tvb_get_ntohs(tvb, 3);
col_add_fstr(pinfo->cinfo, COL_INFO, "OUI %s (%s), PID 0x%04X",
tvb_bytes_to_str_punct(pinfo->pool, tvb, 0, 3, ':'),
manuf ? manuf : "Unknown", pid);
/*
* Do we have information for this OUI?
*/
if (oui_info_table != NULL &&
(oui_info = (oui_info_t *)g_hash_table_lookup(oui_info_table,
GUINT_TO_POINTER(oui32))) != NULL) {
/*
* Yes - use it.
*/
hf = *oui_info->field_info->p_id;
subdissector_table = oui_info->table;
} else {
/*
* No, use hf_ieee802a_pid for the PID and just dissect
* the payload as data.
*/
hf = hf_ieee802a_pid;
subdissector_table = NULL;
}
proto_tree_add_uint(ieee802a_tree, hf, tvb, 3, 2, pid);
next_tvb = tvb_new_subset_remaining(tvb, 5);
if ((subdissector_table == NULL) ||
/* do lookup with the subdissector table */
(!dissector_try_uint(subdissector_table, pid, next_tvb, pinfo, tree))) {
call_data_dissector(next_tvb, pinfo, tree);
}
return tvb_captured_length(tvb);
}
static void
ieee802a_shutdown(void)
{
g_hash_table_destroy(oui_info_table);
}
void
proto_register_ieee802a(void)
{
static hf_register_info hf[] = {
{ &hf_ieee802a_oui,
{ "Organization Code", "ieee802a.oui", FT_UINT24, BASE_OUI,
NULL, 0x0, NULL, HFILL }},
{ &hf_ieee802a_pid,
{ "Protocol ID", "ieee802a.pid", FT_UINT16, BASE_HEX,
NULL, 0x0, NULL, HFILL }}
};
static gint *ett[] = {
&ett_ieee802a,
};
proto_ieee802a = proto_register_protocol("IEEE802a OUI Extended Ethertype", "IEEE802a", "ieee802a");
proto_register_field_array(proto_ieee802a, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_shutdown_routine(ieee802a_shutdown);
ieee802a_handle = register_dissector("ieee802a", dissect_ieee802a, proto_ieee802a);
}
static void
register_hf(gpointer key _U_, gpointer value, gpointer user_data _U_)
{
oui_info_t *info = (oui_info_t *)value;
proto_register_field_array(proto_ieee802a, info->field_info, 1);
}
void
proto_reg_handoff_ieee802a(void)
{
dissector_add_uint("ethertype", ETHERTYPE_IEEE802_OUI_EXTENDED,
ieee802a_handle);
/*
* Register all the fields for PIDs for various OUIs.
*/
if (oui_info_table != NULL)
g_hash_table_foreach(oui_info_table, register_hf, NULL);
}
/*
* 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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