f7f155fa58
In order for drivers to provide an alternate set of scan methods, these have to finally use an indirection table and all of the calls in ieee80211_scan.c need to use said table. For all existing drivers - this is basically a glorified, KBI-breaking functional no-op. This is also not the final form - too much functionality is currently hiding in ieee80211_scan_sw.c that should be in ieee80211_scan.c. That'll be the target of some follow-up commits. Note: * You have to recompile your kernel/drivers after this - the net80211 KBI has changed. * I'm not yet planning on bumping any versioning - I have a few more things to shuffle around. Tested: * urtwn(4) - STA mode * Intel 7260 in local repo - overriding the methods and table at attach time has the desired effect (ie, all the methods are called, but nothing is ever performed.)
348 lines
15 KiB
C
348 lines
15 KiB
C
/*-
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* Copyright (c) 2005-2009 Sam Leffler, Errno Consulting
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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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _NET80211_IEEE80211_SCAN_H_
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#define _NET80211_IEEE80211_SCAN_H_
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/*
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* 802.11 scanning support.
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*
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* Scanning is the procedure by which a station locates a bss to join
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* (infrastructure/ibss mode), or a channel to use (when operating as
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* an ap or ibss master). Scans are either "active" or "passive". An
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* active scan causes one or more probe request frames to be sent on
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* visiting each channel. A passive request causes each channel in the
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* scan set to be visited but no frames to be transmitted; the station
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* only listens for traffic. Note that active scanning may still need
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* to listen for traffic before sending probe request frames depending
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* on regulatory constraints; the 802.11 layer handles this by generating
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* a callback when scanning on a ``passive channel'' when the
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* IEEE80211_FEXT_PROBECHAN flag is set.
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*
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* A scan operation involves constructing a set of channels to inspect
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* (the scan set), visiting each channel and collecting information
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* (e.g. what bss are present), and then analyzing the results to make
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* decisions like which bss to join. This process needs to be as fast
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* as possible so we do things like intelligently construct scan sets
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* and dwell on a channel only as long as necessary. The scan code also
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* maintains a cache of recent scan results and uses it to bypass scanning
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* whenever possible. The scan cache is also used to enable roaming
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* between access points when operating in infrastructure mode.
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*
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* Scanning is handled with pluggable modules that implement "policy"
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* per-operating mode. The core scanning support provides an
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* instrastructure to support these modules and exports a common api
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* to the rest of the 802.11 layer. Policy modules decide what
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* channels to visit, what state to record to make decisions (e.g. ap
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* mode scanning for auto channel selection keeps significantly less
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* state than sta mode scanning for an ap to associate to), and selects
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* the final station/channel to return as the result of a scan.
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*
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* Scanning is done synchronously when initially bringing a vap to an
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* operational state and optionally in the background to maintain the
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* scan cache for doing roaming and rogue ap monitoring. Scanning is
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* not tied to the 802.11 state machine that governs vaps though there
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* is linkage to the IEEE80211_SCAN state. Only one vap at a time may
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* be scanning; this scheduling policy is handled in ieee80211_new_state
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* and is invisible to the scanning code.
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*/
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#define IEEE80211_SCAN_MAX IEEE80211_CHAN_MAX
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struct ieee80211_scanner; /* scan policy state */
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struct ieee80211_scan_ssid {
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int len; /* length in bytes */
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uint8_t ssid[IEEE80211_NWID_LEN]; /* ssid contents */
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};
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#define IEEE80211_SCAN_MAX_SSID 1 /* max # ssid's to probe */
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/*
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* High-level implementation visible to ieee80211_scan.[ch].
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*
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* The default scanner (ieee80211_scan_sw.[ch]) implements a software
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* driven scanner. Firmware driven scanning needs a different set of
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* behaviours.
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*/
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struct ieee80211_scan_methods {
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void (*sc_attach)(struct ieee80211com *);
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void (*sc_detach)(struct ieee80211com *);
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void (*sc_vattach)(struct ieee80211vap *);
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void (*sc_vdetach)(struct ieee80211vap *);
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void (*sc_set_scan_duration)(struct ieee80211vap *, u_int);
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int (*sc_start_scan)(const struct ieee80211_scanner *,
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struct ieee80211vap *, int, u_int, u_int, u_int, u_int,
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const struct ieee80211_scan_ssid ssids[]);
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int (*sc_check_scan)(const struct ieee80211_scanner *,
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struct ieee80211vap *, int, u_int, u_int, u_int, u_int,
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const struct ieee80211_scan_ssid ssids[]);
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int (*sc_bg_scan)(const struct ieee80211_scanner *,
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struct ieee80211vap *, int);
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void (*sc_cancel_scan)(struct ieee80211vap *);
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void (*sc_cancel_anyscan)(struct ieee80211vap *);
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void (*sc_scan_next)(struct ieee80211vap *);
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void (*sc_scan_done)(struct ieee80211vap *);
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void (*sc_scan_probe_curchan)(struct ieee80211vap *, int);
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void (*sc_add_scan)(struct ieee80211vap *,
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struct ieee80211_channel *,
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const struct ieee80211_scanparams *,
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const struct ieee80211_frame *,
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int, int, int);
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};
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/*
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* Scan state visible to the 802.11 layer. Scan parameters and
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* results are stored in this data structure. The ieee80211_scan_state
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* structure is extended with space that is maintained private to
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* the core scanning support. We allocate one instance and link it
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* to the ieee80211com structure; then share it between all associated
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* vaps. We could allocate multiple of these, e.g. to hold multiple
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* scan results, but this is sufficient for current needs.
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*/
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struct ieee80211_scan_state {
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struct ieee80211vap *ss_vap;
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struct ieee80211com *ss_ic;
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const struct ieee80211_scanner *ss_ops; /* policy hookup, see below */
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void *ss_priv; /* scanner private state */
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uint16_t ss_flags;
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#define IEEE80211_SCAN_NOPICK 0x0001 /* scan only, no selection */
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#define IEEE80211_SCAN_ACTIVE 0x0002 /* active scan (probe req) */
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#define IEEE80211_SCAN_PICK1ST 0x0004 /* ``hey sailor'' mode */
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#define IEEE80211_SCAN_BGSCAN 0x0008 /* bg scan, exit ps at end */
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#define IEEE80211_SCAN_ONCE 0x0010 /* do one complete pass */
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#define IEEE80211_SCAN_NOBCAST 0x0020 /* no broadcast probe req */
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#define IEEE80211_SCAN_NOJOIN 0x0040 /* no auto-sequencing */
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#define IEEE80211_SCAN_GOTPICK 0x1000 /* got candidate, can stop */
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uint8_t ss_nssid; /* # ssid's to probe/match */
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struct ieee80211_scan_ssid ss_ssid[IEEE80211_SCAN_MAX_SSID];
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/* ssid's to probe/match */
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/* ordered channel set */
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struct ieee80211_channel *ss_chans[IEEE80211_SCAN_MAX];
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uint16_t ss_next; /* ix of next chan to scan */
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uint16_t ss_last; /* ix+1 of last chan to scan */
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unsigned long ss_mindwell; /* min dwell on channel */
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unsigned long ss_maxdwell; /* max dwell on channel */
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};
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/*
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* The upper 16 bits of the flags word is used to communicate
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* information to the scanning code that is NOT recorded in
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* ss_flags. It might be better to split this stuff out into
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* a separate variable to avoid confusion.
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*/
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#define IEEE80211_SCAN_FLUSH 0x00010000 /* flush candidate table */
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#define IEEE80211_SCAN_NOSSID 0x80000000 /* don't update ssid list */
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struct ieee80211com;
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void ieee80211_scan_attach(struct ieee80211com *);
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void ieee80211_scan_detach(struct ieee80211com *);
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void ieee80211_scan_vattach(struct ieee80211vap *);
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void ieee80211_scan_vdetach(struct ieee80211vap *);
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void ieee80211_scan_dump_channels(const struct ieee80211_scan_state *);
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#define IEEE80211_SCAN_FOREVER 0x7fffffff
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int ieee80211_start_scan(struct ieee80211vap *, int flags,
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u_int duration, u_int mindwell, u_int maxdwell,
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u_int nssid, const struct ieee80211_scan_ssid ssids[]);
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int ieee80211_check_scan(struct ieee80211vap *, int flags,
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u_int duration, u_int mindwell, u_int maxdwell,
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u_int nssid, const struct ieee80211_scan_ssid ssids[]);
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int ieee80211_check_scan_current(struct ieee80211vap *);
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int ieee80211_bg_scan(struct ieee80211vap *, int);
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void ieee80211_cancel_scan(struct ieee80211vap *);
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void ieee80211_cancel_anyscan(struct ieee80211vap *);
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void ieee80211_scan_next(struct ieee80211vap *);
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void ieee80211_scan_done(struct ieee80211vap *);
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void ieee80211_probe_curchan(struct ieee80211vap *, int);
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struct ieee80211_channel *ieee80211_scan_pickchannel(struct ieee80211com *, int);
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struct ieee80211_scanparams;
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void ieee80211_add_scan(struct ieee80211vap *,
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struct ieee80211_channel *,
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const struct ieee80211_scanparams *,
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const struct ieee80211_frame *,
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int subtype, int rssi, int noise);
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void ieee80211_scan_timeout(struct ieee80211com *);
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void ieee80211_scan_assoc_success(struct ieee80211vap *,
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const uint8_t mac[IEEE80211_ADDR_LEN]);
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enum {
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IEEE80211_SCAN_FAIL_TIMEOUT = 1, /* no response to mgmt frame */
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IEEE80211_SCAN_FAIL_STATUS = 2 /* negative response to " " */
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};
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void ieee80211_scan_assoc_fail(struct ieee80211vap *,
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const uint8_t mac[IEEE80211_ADDR_LEN], int reason);
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void ieee80211_scan_flush(struct ieee80211vap *);
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struct ieee80211_scan_entry;
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typedef void ieee80211_scan_iter_func(void *,
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const struct ieee80211_scan_entry *);
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void ieee80211_scan_iterate(struct ieee80211vap *,
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ieee80211_scan_iter_func, void *);
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enum {
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IEEE80211_BPARSE_BADIELEN = 0x01, /* ie len past end of frame */
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IEEE80211_BPARSE_RATES_INVALID = 0x02, /* invalid RATES ie */
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IEEE80211_BPARSE_XRATES_INVALID = 0x04, /* invalid XRATES ie */
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IEEE80211_BPARSE_SSID_INVALID = 0x08, /* invalid SSID ie */
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IEEE80211_BPARSE_CHAN_INVALID = 0x10, /* invalid FH/DSPARMS chan */
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IEEE80211_BPARSE_OFFCHAN = 0x20, /* DSPARMS chan != curchan */
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IEEE80211_BPARSE_BINTVAL_INVALID= 0x40, /* invalid beacon interval */
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IEEE80211_BPARSE_CSA_INVALID = 0x80, /* invalid CSA ie */
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};
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/*
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* Parameters supplied when adding/updating an entry in a
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* scan cache. Pointer variables should be set to NULL
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* if no data is available. Pointer references can be to
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* local data; any information that is saved will be copied.
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* All multi-byte values must be in host byte order.
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*/
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struct ieee80211_scanparams {
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uint8_t status; /* bitmask of IEEE80211_BPARSE_* */
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uint8_t chan; /* channel # from FH/DSPARMS */
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uint8_t bchan; /* curchan's channel # */
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uint8_t fhindex;
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uint16_t fhdwell; /* FHSS dwell interval */
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uint16_t capinfo; /* 802.11 capabilities */
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uint16_t erp; /* NB: 0x100 indicates ie present */
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uint16_t bintval;
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uint8_t timoff;
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uint8_t *ies; /* all captured ies */
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size_t ies_len; /* length of all captured ies */
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uint8_t *tim;
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uint8_t *tstamp;
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uint8_t *country;
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uint8_t *ssid;
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uint8_t *rates;
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uint8_t *xrates;
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uint8_t *doth;
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uint8_t *wpa;
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uint8_t *rsn;
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uint8_t *wme;
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uint8_t *htcap;
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uint8_t *htinfo;
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uint8_t *ath;
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uint8_t *tdma;
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uint8_t *csa;
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uint8_t *quiet;
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uint8_t *meshid;
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uint8_t *meshconf;
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uint8_t *spare[3];
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};
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/*
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* Scan cache entry format used when exporting data from a policy
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* module; this data may be represented some other way internally.
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*/
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struct ieee80211_scan_entry {
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uint8_t se_macaddr[IEEE80211_ADDR_LEN];
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uint8_t se_bssid[IEEE80211_ADDR_LEN];
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/* XXX can point inside se_ies */
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uint8_t se_ssid[2+IEEE80211_NWID_LEN];
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uint8_t se_rates[2+IEEE80211_RATE_MAXSIZE];
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uint8_t se_xrates[2+IEEE80211_RATE_MAXSIZE];
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union {
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uint8_t data[8];
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u_int64_t tsf;
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} se_tstamp; /* from last rcv'd beacon */
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uint16_t se_intval; /* beacon interval (host byte order) */
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uint16_t se_capinfo; /* capabilities (host byte order) */
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struct ieee80211_channel *se_chan;/* channel where sta found */
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uint16_t se_timoff; /* byte offset to TIM ie */
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uint16_t se_fhdwell; /* FH only (host byte order) */
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uint8_t se_fhindex; /* FH only */
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uint8_t se_dtimperiod; /* DTIM period */
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uint16_t se_erp; /* ERP from beacon/probe resp */
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int8_t se_rssi; /* avg'd recv ssi */
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int8_t se_noise; /* noise floor */
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uint8_t se_cc[2]; /* captured country code */
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uint8_t se_meshid[2+IEEE80211_MESHID_LEN];
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struct ieee80211_ies se_ies; /* captured ie's */
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u_int se_age; /* age of entry (0 on create) */
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};
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MALLOC_DECLARE(M_80211_SCAN);
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/*
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* Template for an in-kernel scan policy module.
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* Modules register with the scanning code and are
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* typically loaded as needed.
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*/
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struct ieee80211_scanner {
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const char *scan_name; /* printable name */
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int (*scan_attach)(struct ieee80211_scan_state *);
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int (*scan_detach)(struct ieee80211_scan_state *);
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int (*scan_start)(struct ieee80211_scan_state *,
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struct ieee80211vap *);
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int (*scan_restart)(struct ieee80211_scan_state *,
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struct ieee80211vap *);
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int (*scan_cancel)(struct ieee80211_scan_state *,
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struct ieee80211vap *);
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int (*scan_end)(struct ieee80211_scan_state *,
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struct ieee80211vap *);
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int (*scan_flush)(struct ieee80211_scan_state *);
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struct ieee80211_channel *(*scan_pickchan)(
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struct ieee80211_scan_state *, int);
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/* add an entry to the cache */
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int (*scan_add)(struct ieee80211_scan_state *,
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struct ieee80211_channel *,
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const struct ieee80211_scanparams *,
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const struct ieee80211_frame *,
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int subtype, int rssi, int noise);
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/* age and/or purge entries in the cache */
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void (*scan_age)(struct ieee80211_scan_state *);
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/* note that association failed for an entry */
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void (*scan_assoc_fail)(struct ieee80211_scan_state *,
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const uint8_t macaddr[IEEE80211_ADDR_LEN],
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int reason);
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/* note that association succeed for an entry */
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void (*scan_assoc_success)(struct ieee80211_scan_state *,
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const uint8_t macaddr[IEEE80211_ADDR_LEN]);
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/* iterate over entries in the scan cache */
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void (*scan_iterate)(struct ieee80211_scan_state *,
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ieee80211_scan_iter_func *, void *);
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void (*scan_spare0)(void);
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void (*scan_spare1)(void);
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void (*scan_spare2)(void);
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void (*scan_spare4)(void);
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};
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void ieee80211_scanner_register(enum ieee80211_opmode,
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const struct ieee80211_scanner *);
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void ieee80211_scanner_unregister(enum ieee80211_opmode,
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const struct ieee80211_scanner *);
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void ieee80211_scanner_unregister_all(const struct ieee80211_scanner *);
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const struct ieee80211_scanner *ieee80211_scanner_get(enum ieee80211_opmode);
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void ieee80211_scan_update_locked(struct ieee80211vap *vap,
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const struct ieee80211_scanner *scan);
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void ieee80211_scan_copy_ssid(struct ieee80211vap *vap,
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struct ieee80211_scan_state *ss,
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int nssid, const struct ieee80211_scan_ssid ssids[]);
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void ieee80211_scan_dump_probe_beacon(uint8_t subtype, int isnew,
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const uint8_t mac[IEEE80211_ADDR_LEN],
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const struct ieee80211_scanparams *sp, int rssi);
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void ieee80211_scan_dump(struct ieee80211_scan_state *ss);
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#endif /* _NET80211_IEEE80211_SCAN_H_ */
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