c0b65123d0
For TSF and beacon generation, each STA has to start its local TSF timer and sends beacon frames when it reaches the state IEEE80211_S_RUN. The TSF timer will be used for IBSS merge and beacon frame transmission. The TSF timer is kept in the HAL of wtap(4). It is working by continuously updating its value on timer interrupt simulated by callout_reset(). When receiving beacons, the STA will be merged into the IBSS if - the STA has the same SSID as the beacon sender - the STA's TSF timer is smaller than the beacon sender's TSF timer. After the merging process, the younger STA will be in the IBSS created by the older STA and the younger STA stops sending beacon frames. So beacon frames will always be sent by the oldest STA in IBSS. Sponsored by: Google, Inc. (GSoC 2022) Reviewed By: lwhsu, adrian Differential Revision: https://reviews.freebsd.org/D35841
67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2010-2011 Monthadar Al Jaberi, TerraNet AB
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
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* redistribution must be conditioned upon including a substantially
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* similar Disclaimer requirement for further binary redistribution.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGES.
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*
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* $FreeBSD$
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*/
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#ifndef _WTAP_HAL_H_
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#define _WTAP_HAL_H_
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#include "../if_wtapvar.h"
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#include "../plugins/wtap_plugin.h"
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#include "handler.h"
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#define HAL_TIMER_INTVAL 50 /* in msecs */
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struct wtap_hal {
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struct wtap_medium *hal_md;
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struct mtx hal_mtx;
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struct wtap_plugin *plugin;
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struct wtap_softc *hal_devs[MAX_NBR_WTAP];
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/* hardware information */
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struct hw {
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struct callout timer_intr;
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uint32_t timer_intr_intval;
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uint64_t tsf;
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} hw;
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};
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void init_hal(struct wtap_hal *);
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void deinit_hal(struct wtap_hal *);
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void register_plugin(struct wtap_hal *, struct wtap_plugin *);
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void deregister_plugin(struct wtap_hal *);
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int32_t new_wtap(struct wtap_hal *, int32_t id);
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int32_t free_wtap(struct wtap_hal *, int32_t id);
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void wtap_hal_timer_intr(void *);
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void wtap_hal_reset_tsf(struct wtap_hal *);
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uint64_t wtap_hal_get_tsf(struct wtap_hal *);
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#endif
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