ieee80211_scan.h

Linux下wifi实现

/*-
 * Copyright (c) 2005 Sam Leffler, Errno Consulting
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $Id: ieee80211_scan.h 1441 2006-02-06 16:03:21Z mrenzmann $
 */
#ifndef _NET80211_IEEE80211_SCAN_H_
#define _NET80211_IEEE80211_SCAN_H_

#define	IEEE80211_SCAN_MAX	IEEE80211_CHAN_MAX

struct ieee80211_scanner;

struct ieee80211_scan_ssid {
	int len;					/* length in bytes */
	u_int8_t ssid[IEEE80211_NWID_LEN];	/* ssid contents */
};
#define	IEEE80211_SCAN_MAX_SSID	1

struct ieee80211_scan_state {
	struct ieee80211vap *ss_vap;
	const struct ieee80211_scanner *ss_ops;	/* policy hookup, see below */
	void *ss_priv;				/* scanner private state */
	u_int16_t ss_flags;
#define	IEEE80211_SCAN_NOPICK	0x0001		/* scan only, no selection */
#define	IEEE80211_SCAN_ACTIVE	0x0002		/* active scan (probe req) */
#define	IEEE80211_SCAN_PICK1ST	0x0004		/* ``hey sailor'' mode */
#define	IEEE80211_SCAN_BGSCAN	0x0008		/* bg scan, exit ps at end */
#define	IEEE80211_SCAN_ONCE	0x0010		/* do one complete pass */
#define	IEEE80211_SCAN_GOTPICK	0x1000		/* got candidate, can stop */

	u_int8_t	ss_nssid;			/* # ssid's to probe/match */
	struct ieee80211_scan_ssid ss_ssid[IEEE80211_SCAN_MAX_SSID];
						/* ssid's to probe/match */
						/* ordered channel set */
	struct ieee80211_channel *ss_chans[IEEE80211_SCAN_MAX];
	u_int16_t ss_next;			/* ix of next chan to scan */
	u_int16_t ss_last;			/* ix + 1 of last chan to scan */
	unsigned long ss_mindwell;		/* min dwell on channel */
	unsigned long ss_maxdwell;		/* max dwell on channel */
	u_int ss_duration;			/* used for calling ieee80211_start_scan() */
};

/*
 * The upper 16 bits of the flags word is used to communicate
 * information to the scanning code that is NOT recorded in
 * ss_flags.  It might be better to split this stuff out into
 * a separate variable to avoid confusion.
 */
#define	IEEE80211_SCAN_FLUSH	0x10000		/* flush candidate table */
#define	IEEE80211_SCAN_NOSSID	0x20000		/* don't update ssid list */
#define	IEEE80211_SCAN_USECACHE	0x40000		/* Must use a result from the cache */
#define	IEEE80211_SCAN_KEEPMODE	0x80000		/* Must keep the same wireless mode (11a, 11g, or 11at, etc) */

struct ieee80211com;
void ieee80211_scan_attach(struct ieee80211com *);
void ieee80211_scan_detach(struct ieee80211com *);
void ieee80211_scan_vattach(struct ieee80211vap *);
void ieee80211_scan_vdetach(struct ieee80211vap *);

void ieee80211_scan_dump_channels(const struct ieee80211_scan_state *);

#define	IEEE80211_SCAN_FOREVER	0x7fffffff
int ieee80211_start_scan(struct ieee80211vap *, int, u_int, u_int,
	const struct ieee80211_scan_ssid ssids[]);
int ieee80211_check_scan(struct ieee80211vap *, int, u_int, u_int,
	const struct ieee80211_scan_ssid ssids[],
	int (*action)(struct ieee80211vap *, const struct ieee80211_scan_entry *));
int ieee80211_bg_scan(struct ieee80211vap *);
void ieee80211_cancel_scan(struct ieee80211vap *);

int ieee80211_scan_dfs_action(struct ieee80211vap *, const struct ieee80211_scan_entry *);

struct ieee80211_scanparams;
void ieee80211_add_scan(struct ieee80211vap *, const struct ieee80211_scanparams *,
	const struct ieee80211_frame *, int, int, int);
void ieee80211_scan_timeout(struct ieee80211com *);

void ieee80211_scan_assoc_success(struct ieee80211com *,
	const u_int8_t mac[IEEE80211_ADDR_LEN]);
enum {
	IEEE80211_SCAN_FAIL_TIMEOUT	= 1,	/* no response to mgmt frame */
	IEEE80211_SCAN_FAIL_STATUS	= 2	/* negative response to " " */
};
void ieee80211_scan_assoc_fail(struct ieee80211com *,
	const u_int8_t mac[IEEE80211_ADDR_LEN], int);
void ieee80211_scan_flush(struct ieee80211com *);

struct ieee80211_scan_entry;
typedef void ieee80211_scan_iter_func(void *, const struct ieee80211_scan_entry *);
void ieee80211_scan_iterate(struct ieee80211com *, ieee80211_scan_iter_func, void *);

/*
 * Parameters supplied when adding/updating an entry in a
 * scan cache.  Pointer variables should be set to NULL
 * if no data is available.  Pointer references can be to
 * local data; any information that is saved will be copied.
 * All multi-byte values must be in host byte order.
 */
struct ieee80211_scanparams {
	u_int16_t capinfo;	/* 802.11 capabilities */
	u_int16_t fhdwell;	/* FHSS dwell interval */
	u_int8_t chan;		/* */
	u_int8_t bchan;
	u_int8_t fhindex;
	u_int8_t erp;
	u_int8_t bintval;
	u_int8_t timoff;
	u_int8_t *tim;
	u_int8_t *tstamp;
	u_int8_t *country;
	u_int8_t *ssid;
	u_int8_t *rates;
	u_int8_t *xrates;
	u_int8_t *doth;
	u_int8_t *wpa;
	u_int8_t *rsn;
	u_int8_t *wme;
	u_int8_t *ath;
};

/*
 * Scan cache entry format used when exporting data from a policy
 * module; this data may be represented some other way internally.
 */
struct ieee80211_scan_entry {
	u_int8_t se_macaddr[IEEE80211_ADDR_LEN];
	u_int8_t se_bssid[IEEE80211_ADDR_LEN];
	u_int8_t se_ssid[2 + IEEE80211_NWID_LEN];
	u_int8_t se_rates[2 + IEEE80211_RATE_MAXSIZE];
	u_int8_t se_xrates[2 + IEEE80211_RATE_MAXSIZE];
	u_int32_t se_rstamp;		/* recv timestamp */
	union {
		u_int8_t data[8];
		u_int64_t tsf;
	} se_tstamp;			/* from last rcv'd beacon */
	u_int16_t se_intval;		/* beacon interval (host byte order) */
	u_int16_t se_capinfo;		/* capabilities (host byte order) */
	struct ieee80211_channel *se_chan;/* channel where sta found */
	u_int16_t se_timoff;		/* byte offset to TIM ie */
	u_int16_t se_fhdwell;		/* FH only (host byte order) */
	u_int8_t se_fhindex;		/* FH only */
	u_int8_t se_erp;			/* ERP from beacon/probe resp */
	int8_t se_rssi;			/* avg'd recv ssi */
	u_int8_t se_dtimperiod;		/* DTIM period */
	u_int8_t *se_wpa_ie;		/* captured WPA ie */
	u_int8_t *se_rsn_ie;		/* captured RSN ie */
	u_int8_t *se_wme_ie;		/* captured WME ie */
	u_int8_t *se_ath_ie;		/* captured Atheros ie */
	u_int se_age;			/* age of entry (0 on create) */
};

/*
 * Template for an in-kernel scan policy module.
 * Modules register with the scanning code and are
 * typically loaded as needed.
 */
struct ieee80211_scanner {
	const char *scan_name;		/* printable name */
	int (*scan_attach)(struct ieee80211_scan_state *);
	int (*scan_detach)(struct ieee80211_scan_state *);
	int (*scan_start)(struct ieee80211_scan_state *, struct ieee80211vap *);
	int (*scan_restart)(struct ieee80211_scan_state *, struct ieee80211vap *);
	int (*scan_cancel)(struct ieee80211_scan_state *, struct ieee80211vap *);
	int (*scan_end)(struct ieee80211_scan_state *, struct ieee80211vap *,
		int (*action)(struct ieee80211vap *, const struct ieee80211_scan_entry *),
		u_int32_t);
	int (*scan_flush)(struct ieee80211_scan_state *);
	/* add an entry to the cache */
	int (*scan_add)(struct ieee80211_scan_state *,
		const struct ieee80211_scanparams *,
		const struct ieee80211_frame *, int, int, int);
	/* age and/or purge entries in the cache */
	void (*scan_age)(struct ieee80211_scan_state *);
	/* note that association failed for an entry */
	void (*scan_assoc_fail)(struct ieee80211_scan_state *,
		const u_int8_t macaddr[IEEE80211_ADDR_LEN], int);
	/* note that association succeed for an entry */
	void (*scan_assoc_success)(struct ieee80211_scan_state *,
		const u_int8_t macaddr[IEEE80211_ADDR_LEN]);
	/* iterate over entries in the scan cache */
	void (*scan_iterate)(struct ieee80211_scan_state *,
		ieee80211_scan_iter_func *, void *);
	/* default action to take when found scan match */
	int (*scan_default)(struct ieee80211vap *,
		const struct ieee80211_scan_entry *);
};
const struct ieee80211_scanner *ieee80211_scanner_get(enum ieee80211_opmode,
	int);
void ieee80211_scanner_register(enum ieee80211_opmode,
	const struct ieee80211_scanner *);
void ieee80211_scanner_unregister(enum ieee80211_opmode,
	const struct ieee80211_scanner *);
void ieee80211_scanner_unregister_all(const struct ieee80211_scanner *);
#endif /* _NET80211_IEEE80211_SCAN_H_ */