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
160 lines
4.8 KiB
C
160 lines
4.8 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 _DEV_WTAP_WTAPVAR_H
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#define _DEV_WTAP_WTAPVAR_H
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/module.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sockio.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/errno.h>
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#include <sys/callout.h>
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#include <sys/endian.h>
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#include <sys/kthread.h>
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#include <sys/taskqueue.h>
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#include <sys/priv.h>
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#include <sys/sysctl.h>
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#include <machine/bus.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_media.h>
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#include <net/if_types.h>
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#include <net/if_arp.h>
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#include <net/ethernet.h>
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#include <net/if_llc.h>
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#include <net80211/ieee80211_var.h>
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#include <net80211/ieee80211_regdomain.h>
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#include <net/bpf.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#if 0
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#define DWTAP_PRINTF(...) printf(__VA_ARGS__)
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#else
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#define DWTAP_PRINTF(...)
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#endif
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#include "if_wtapioctl.h"
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#define MAX_NBR_WTAP (64)
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#define BEACON_INTRERVAL (1000)
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MALLOC_DECLARE(M_WTAP);
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MALLOC_DECLARE(M_WTAP_PACKET);
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MALLOC_DECLARE(M_WTAP_BEACON);
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MALLOC_DECLARE(M_WTAP_RXBUF);
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MALLOC_DECLARE(M_WTAP_PLUGIN);
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/* driver-specific node state */
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struct wtap_node {
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struct ieee80211_node an_node; /* base class */
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/* future addons */
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};
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#define WTAP_NODE(ni) ((struct ath_node *)(ni))
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#define WTAP_NODE_CONST(ni) ((const struct ath_node *)(ni))
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struct wtap_buf {
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STAILQ_ENTRY(wtap_buf) bf_list;
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struct mbuf *m; /* mbuf for buf */
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};
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typedef STAILQ_HEAD(, wtap_buf) wtap_bufhead;
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#define WTAP_BUF_BUSY 0x00000002 /* (tx) desc owned by h/w */
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struct wtap_vap {
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struct ieee80211vap av_vap; /* base class */
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int32_t id; /* wtap id */
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struct cdev *av_dev; /* userspace injecting frames */
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struct wtap_medium *av_md; /* back pointer */
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struct mbuf *beacon; /* beacon */
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struct ieee80211_node *bf_node; /* pointer to the node */
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struct callout av_swba; /* software beacon alert */
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uint32_t av_bcinterval; /* beacon interval */
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void (*av_recv_mgmt)(struct ieee80211_node *,
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struct mbuf *, int, const struct ieee80211_rx_stats *, int, int);
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int (*av_newstate)(struct ieee80211vap *,
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enum ieee80211_state, int);
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void (*av_bmiss)(struct ieee80211vap *);
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};
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#define WTAP_VAP(vap) ((struct wtap_vap *)(vap))
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struct taskqueue;
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struct wtap_softc {
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struct ieee80211com sc_ic;
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char name[7]; /* wtapXX\0 */
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int32_t id;
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int32_t up;
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struct wtap_medium *sc_md; /* interface medium */
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struct wtap_hal *hal;
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struct ieee80211_node* (* sc_node_alloc)
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(struct ieee80211vap *, const uint8_t [IEEE80211_ADDR_LEN]);
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void (*sc_node_free)(struct ieee80211_node *);
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struct mtx sc_mtx; /* master lock (recursive) */
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struct taskqueue *sc_tq; /* private task queue */
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wtap_bufhead sc_rxbuf; /* receive buffer */
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struct task sc_rxtask; /* rx int processing */
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struct wtap_tx_radiotap_header sc_tx_th;
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int sc_tx_th_len;
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struct wtap_rx_radiotap_header sc_rx_th;
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int sc_rx_th_len;
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};
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int32_t wtap_attach(struct wtap_softc *, const uint8_t *macaddr);
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int32_t wtap_detach(struct wtap_softc *);
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void wtap_resume(struct wtap_softc *);
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void wtap_suspend(struct wtap_softc *);
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void wtap_shutdown(struct wtap_softc *);
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void wtap_intr(struct wtap_softc *);
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void wtap_inject(struct wtap_softc *, struct mbuf *);
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#endif
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