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