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.)
666 lines
18 KiB
C
666 lines
18 KiB
C
/*-
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* Copyright (c) 2002-2008 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* IEEE 802.11 scanning support.
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*/
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#include "opt_wlan.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/kernel.h>
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#include <sys/condvar.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_media.h>
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#include <net/ethernet.h>
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#include <net80211/ieee80211_var.h>
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/* XXX until it's implemented as attach ops */
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#include <net80211/ieee80211_scan_sw.h>
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#include <net/bpf.h>
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/*
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* Roaming-related defaults. RSSI thresholds are as returned by the
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* driver (.5dBm). Transmit rate thresholds are IEEE rate codes (i.e
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* .5M units) or MCS.
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*/
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/* rssi thresholds */
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#define ROAM_RSSI_11A_DEFAULT 14 /* 11a bss */
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#define ROAM_RSSI_11B_DEFAULT 14 /* 11b bss */
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#define ROAM_RSSI_11BONLY_DEFAULT 14 /* 11b-only bss */
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/* transmit rate thresholds */
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#define ROAM_RATE_11A_DEFAULT 2*12 /* 11a bss */
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#define ROAM_RATE_11B_DEFAULT 2*5 /* 11b bss */
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#define ROAM_RATE_11BONLY_DEFAULT 2*1 /* 11b-only bss */
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#define ROAM_RATE_HALF_DEFAULT 2*6 /* half-width 11a/g bss */
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#define ROAM_RATE_QUARTER_DEFAULT 2*3 /* quarter-width 11a/g bss */
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#define ROAM_MCS_11N_DEFAULT (1 | IEEE80211_RATE_MCS) /* 11n bss */
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void
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ieee80211_scan_attach(struct ieee80211com *ic)
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{
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/*
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* If there's no scan method pointer, attach the
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* swscan set as a default.
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*/
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if (ic->ic_scan_methods == NULL)
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ieee80211_swscan_attach(ic);
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else
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ic->ic_scan_methods->sc_attach(ic);
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}
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void
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ieee80211_scan_detach(struct ieee80211com *ic)
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{
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/*
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* Ideally we'd do the ss_ops detach call here;
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* but then sc_detach() would need to be split in two.
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*
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* I'll do that later.
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*/
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ic->ic_scan_methods->sc_detach(ic);
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}
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static const struct ieee80211_roamparam defroam[IEEE80211_MODE_MAX] = {
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[IEEE80211_MODE_11A] = { .rssi = ROAM_RSSI_11A_DEFAULT,
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.rate = ROAM_RATE_11A_DEFAULT },
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[IEEE80211_MODE_11G] = { .rssi = ROAM_RSSI_11B_DEFAULT,
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.rate = ROAM_RATE_11B_DEFAULT },
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[IEEE80211_MODE_11B] = { .rssi = ROAM_RSSI_11BONLY_DEFAULT,
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.rate = ROAM_RATE_11BONLY_DEFAULT },
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[IEEE80211_MODE_TURBO_A]= { .rssi = ROAM_RSSI_11A_DEFAULT,
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.rate = ROAM_RATE_11A_DEFAULT },
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[IEEE80211_MODE_TURBO_G]= { .rssi = ROAM_RSSI_11A_DEFAULT,
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.rate = ROAM_RATE_11A_DEFAULT },
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[IEEE80211_MODE_STURBO_A]={ .rssi = ROAM_RSSI_11A_DEFAULT,
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.rate = ROAM_RATE_11A_DEFAULT },
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[IEEE80211_MODE_HALF] = { .rssi = ROAM_RSSI_11A_DEFAULT,
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.rate = ROAM_RATE_HALF_DEFAULT },
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[IEEE80211_MODE_QUARTER]= { .rssi = ROAM_RSSI_11A_DEFAULT,
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.rate = ROAM_RATE_QUARTER_DEFAULT },
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[IEEE80211_MODE_11NA] = { .rssi = ROAM_RSSI_11A_DEFAULT,
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.rate = ROAM_MCS_11N_DEFAULT },
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[IEEE80211_MODE_11NG] = { .rssi = ROAM_RSSI_11B_DEFAULT,
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.rate = ROAM_MCS_11N_DEFAULT },
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};
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void
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ieee80211_scan_vattach(struct ieee80211vap *vap)
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{
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struct ieee80211com *ic = vap->iv_ic;
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vap->iv_bgscanidle = (IEEE80211_BGSCAN_IDLE_DEFAULT*1000)/hz;
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vap->iv_bgscanintvl = IEEE80211_BGSCAN_INTVAL_DEFAULT*hz;
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vap->iv_scanvalid = IEEE80211_SCAN_VALID_DEFAULT*hz;
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vap->iv_roaming = IEEE80211_ROAMING_AUTO;
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memcpy(vap->iv_roamparms, defroam, sizeof(defroam));
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ic->ic_scan_methods->sc_vattach(vap);
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}
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void
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ieee80211_scan_vdetach(struct ieee80211vap *vap)
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{
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struct ieee80211com *ic = vap->iv_ic;
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struct ieee80211_scan_state *ss;
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IEEE80211_LOCK(ic);
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ss = ic->ic_scan;
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ic->ic_scan_methods->sc_vdetach(vap);
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if (ss != NULL && ss->ss_vap == vap) {
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if (ss->ss_ops != NULL) {
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ss->ss_ops->scan_detach(ss);
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ss->ss_ops = NULL;
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}
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ss->ss_vap = NULL;
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}
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IEEE80211_UNLOCK(ic);
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}
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/*
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* Simple-minded scanner module support.
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*/
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static const char *scan_modnames[IEEE80211_OPMODE_MAX] = {
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"wlan_scan_sta", /* IEEE80211_M_IBSS */
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"wlan_scan_sta", /* IEEE80211_M_STA */
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"wlan_scan_wds", /* IEEE80211_M_WDS */
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"wlan_scan_sta", /* IEEE80211_M_AHDEMO */
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"wlan_scan_ap", /* IEEE80211_M_HOSTAP */
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"wlan_scan_monitor", /* IEEE80211_M_MONITOR */
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"wlan_scan_sta", /* IEEE80211_M_MBSS */
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};
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static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX];
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const struct ieee80211_scanner *
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ieee80211_scanner_get(enum ieee80211_opmode mode)
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{
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if (mode >= IEEE80211_OPMODE_MAX)
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return NULL;
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if (scanners[mode] == NULL)
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ieee80211_load_module(scan_modnames[mode]);
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return scanners[mode];
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}
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void
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ieee80211_scanner_register(enum ieee80211_opmode mode,
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const struct ieee80211_scanner *scan)
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{
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if (mode >= IEEE80211_OPMODE_MAX)
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return;
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scanners[mode] = scan;
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}
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void
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ieee80211_scanner_unregister(enum ieee80211_opmode mode,
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const struct ieee80211_scanner *scan)
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{
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if (mode >= IEEE80211_OPMODE_MAX)
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return;
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if (scanners[mode] == scan)
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scanners[mode] = NULL;
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}
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void
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ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan)
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{
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int m;
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for (m = 0; m < IEEE80211_OPMODE_MAX; m++)
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if (scanners[m] == scan)
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scanners[m] = NULL;
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}
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/*
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* Update common scanner state to reflect the current
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* operating mode. This is called when the state machine
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* is transitioned to RUN state w/o scanning--e.g. when
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* operating in monitor mode. The purpose of this is to
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* ensure later callbacks find ss_ops set to properly
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* reflect current operating mode.
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*/
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void
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ieee80211_scan_update_locked(struct ieee80211vap *vap,
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const struct ieee80211_scanner *scan)
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{
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struct ieee80211com *ic = vap->iv_ic;
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struct ieee80211_scan_state *ss = ic->ic_scan;
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IEEE80211_LOCK_ASSERT(ic);
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#ifdef IEEE80211_DEBUG
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if (ss->ss_vap != vap || ss->ss_ops != scan) {
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
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"%s: current scanner is <%s:%s>, switch to <%s:%s>\n",
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__func__,
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ss->ss_vap != NULL ?
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ss->ss_vap->iv_ifp->if_xname : "none",
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ss->ss_vap != NULL ?
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ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none",
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vap->iv_ifp->if_xname,
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ieee80211_opmode_name[vap->iv_opmode]);
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}
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#endif
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ss->ss_vap = vap;
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if (ss->ss_ops != scan) {
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/*
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* Switch scanners; detach old, attach new. Special
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* case where a single scan module implements multiple
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* policies by using different scan ops but a common
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* core. We assume if the old and new attach methods
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* are identical then it's ok to just change ss_ops
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* and not flush the internal state of the module.
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*/
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if (scan == NULL || ss->ss_ops == NULL ||
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ss->ss_ops->scan_attach != scan->scan_attach) {
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if (ss->ss_ops != NULL)
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ss->ss_ops->scan_detach(ss);
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if (scan != NULL && !scan->scan_attach(ss)) {
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/* XXX attach failure */
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/* XXX stat+msg */
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scan = NULL;
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}
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}
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ss->ss_ops = scan;
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}
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}
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void
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ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss)
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{
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struct ieee80211com *ic = ss->ss_ic;
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const char *sep;
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int i;
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sep = "";
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for (i = ss->ss_next; i < ss->ss_last; i++) {
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const struct ieee80211_channel *c = ss->ss_chans[i];
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printf("%s%u%c", sep, ieee80211_chan2ieee(ic, c),
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ieee80211_channel_type_char(c));
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sep = ", ";
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}
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}
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#ifdef IEEE80211_DEBUG
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void
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ieee80211_scan_dump(struct ieee80211_scan_state *ss)
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{
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struct ieee80211vap *vap = ss->ss_vap;
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if_printf(vap->iv_ifp, "scan set ");
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ieee80211_scan_dump_channels(ss);
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printf(" dwell min %lums max %lums\n",
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ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell));
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}
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#endif /* IEEE80211_DEBUG */
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void
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ieee80211_scan_copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss,
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int nssid, const struct ieee80211_scan_ssid ssids[])
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{
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if (nssid > IEEE80211_SCAN_MAX_SSID) {
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/* XXX printf */
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
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"%s: too many ssid %d, ignoring all of them\n",
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__func__, nssid);
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return;
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}
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memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0]));
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ss->ss_nssid = nssid;
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}
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/*
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* Start a scan unless one is already going.
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*/
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int
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ieee80211_start_scan(struct ieee80211vap *vap, 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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{
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const struct ieee80211_scanner *scan;
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struct ieee80211com *ic = vap->iv_ic;
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scan = ieee80211_scanner_get(vap->iv_opmode);
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if (scan == NULL) {
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
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"%s: no scanner support for %s mode\n",
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__func__, ieee80211_opmode_name[vap->iv_opmode]);
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/* XXX stat */
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return 0;
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}
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return ic->ic_scan_methods->sc_start_scan(scan, vap, flags, duration,
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mindwell, maxdwell, nssid, ssids);
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}
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/*
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* Check the scan cache for an ap/channel to use; if that
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* fails then kick off a new scan.
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*/
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int
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ieee80211_check_scan(struct ieee80211vap *vap, 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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{
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struct ieee80211com *ic = vap->iv_ic;
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struct ieee80211_scan_state *ss = ic->ic_scan;
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const struct ieee80211_scanner *scan;
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int result;
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scan = ieee80211_scanner_get(vap->iv_opmode);
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if (scan == NULL) {
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
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"%s: no scanner support for %s mode\n",
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__func__, vap->iv_opmode);
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/* XXX stat */
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return 0;
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}
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/*
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* Check if there's a list of scan candidates already.
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* XXX want more than the ap we're currently associated with
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*/
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IEEE80211_LOCK(ic);
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
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"%s: %s scan, %s%s%s%s%s\n"
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, __func__
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, flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"
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, flags & IEEE80211_SCAN_FLUSH ? "flush" : "append"
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, flags & IEEE80211_SCAN_NOPICK ? ", nopick" : ""
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, flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : ""
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, flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : ""
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, flags & IEEE80211_SCAN_ONCE ? ", once" : ""
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);
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if (ss->ss_ops != scan) {
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/* XXX re-use cache contents? e.g. adhoc<->sta */
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flags |= IEEE80211_SCAN_FLUSH;
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}
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/*
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* XXX TODO: separate things out a bit better.
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*/
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ieee80211_scan_update_locked(vap, scan);
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result = ic->ic_scan_methods->sc_check_scan(scan, vap, flags, duration,
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mindwell, maxdwell, nssid, ssids);
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IEEE80211_UNLOCK(ic);
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return (result);
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}
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/*
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* Check the scan cache for an ap/channel to use; if that fails
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* then kick off a scan using the current settings.
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*/
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int
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ieee80211_check_scan_current(struct ieee80211vap *vap)
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{
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return ieee80211_check_scan(vap,
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IEEE80211_SCAN_ACTIVE,
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IEEE80211_SCAN_FOREVER, 0, 0,
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vap->iv_des_nssid, vap->iv_des_ssid);
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}
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/*
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* Restart a previous scan. If the previous scan completed
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* then we start again using the existing channel list.
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*/
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int
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ieee80211_bg_scan(struct ieee80211vap *vap, int flags)
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{
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struct ieee80211com *ic = vap->iv_ic;
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const struct ieee80211_scanner *scan;
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// IEEE80211_UNLOCK_ASSERT(sc);
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scan = ieee80211_scanner_get(vap->iv_opmode);
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if (scan == NULL) {
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
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"%s: no scanner support for %s mode\n",
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__func__, vap->iv_opmode);
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/* XXX stat */
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return 0;
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}
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/*
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* XXX TODO: pull apart the bgscan logic into whatever
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* belongs here and whatever belongs in the software
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* scanner.
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*/
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return (ic->ic_scan_methods->sc_bg_scan(scan, vap, flags));
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}
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/*
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* Cancel any scan currently going on for the specified vap.
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*/
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void
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ieee80211_cancel_scan(struct ieee80211vap *vap)
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{
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struct ieee80211com *ic = vap->iv_ic;
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ic->ic_scan_methods->sc_cancel_scan(vap);
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}
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/*
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* Cancel any scan currently going on.
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*/
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void
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ieee80211_cancel_anyscan(struct ieee80211vap *vap)
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{
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struct ieee80211com *ic = vap->iv_ic;
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ic->ic_scan_methods->sc_cancel_anyscan(vap);
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}
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/*
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* Public access to scan_next for drivers that manage
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* scanning themselves (e.g. for firmware-based devices).
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*/
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void
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ieee80211_scan_next(struct ieee80211vap *vap)
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{
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struct ieee80211com *ic = vap->iv_ic;
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ic->ic_scan_methods->sc_scan_next(vap);
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}
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/*
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* Public access to scan_next for drivers that are not able to scan single
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* channels (e.g. for firmware-based devices).
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*/
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void
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ieee80211_scan_done(struct ieee80211vap *vap)
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{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
struct ieee80211_scan_state *ss;
|
|
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: called\n", __func__);
|
|
|
|
IEEE80211_LOCK(ic);
|
|
ss = ic->ic_scan;
|
|
ss->ss_next = ss->ss_last; /* all channels are complete */
|
|
|
|
ic->ic_scan_methods->sc_scan_done(vap);
|
|
|
|
IEEE80211_UNLOCK(ic);
|
|
}
|
|
|
|
/*
|
|
* Probe the curent channel, if allowed, while scanning.
|
|
* If the channel is not marked passive-only then send
|
|
* a probe request immediately. Otherwise mark state and
|
|
* listen for beacons on the channel; if we receive something
|
|
* then we'll transmit a probe request.
|
|
*/
|
|
void
|
|
ieee80211_probe_curchan(struct ieee80211vap *vap, int force)
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
|
|
if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) {
|
|
ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN;
|
|
return;
|
|
}
|
|
|
|
ic->ic_scan_methods->sc_scan_probe_curchan(vap, force);
|
|
}
|
|
|
|
#ifdef IEEE80211_DEBUG
|
|
static void
|
|
dump_country(const uint8_t *ie)
|
|
{
|
|
const struct ieee80211_country_ie *cie =
|
|
(const struct ieee80211_country_ie *) ie;
|
|
int i, nbands, schan, nchan;
|
|
|
|
if (cie->len < 3) {
|
|
printf(" <bogus country ie, len %d>", cie->len);
|
|
return;
|
|
}
|
|
printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]);
|
|
nbands = (cie->len - 3) / sizeof(cie->band[0]);
|
|
for (i = 0; i < nbands; i++) {
|
|
schan = cie->band[i].schan;
|
|
nchan = cie->band[i].nchan;
|
|
if (nchan != 1)
|
|
printf(" %u-%u,%u", schan, schan + nchan-1,
|
|
cie->band[i].maxtxpwr);
|
|
else
|
|
printf(" %u,%u", schan, cie->band[i].maxtxpwr);
|
|
}
|
|
printf("]");
|
|
}
|
|
|
|
void
|
|
ieee80211_scan_dump_probe_beacon(uint8_t subtype, int isnew,
|
|
const uint8_t mac[IEEE80211_ADDR_LEN],
|
|
const struct ieee80211_scanparams *sp, int rssi)
|
|
{
|
|
|
|
printf("[%s] %s%s on chan %u (bss chan %u) ",
|
|
ether_sprintf(mac), isnew ? "new " : "",
|
|
ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT],
|
|
sp->chan, sp->bchan);
|
|
ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]);
|
|
printf(" rssi %d\n", rssi);
|
|
|
|
if (isnew) {
|
|
printf("[%s] caps 0x%x bintval %u erp 0x%x",
|
|
ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp);
|
|
if (sp->country != NULL)
|
|
dump_country(sp->country);
|
|
printf("\n");
|
|
}
|
|
}
|
|
#endif /* IEEE80211_DEBUG */
|
|
|
|
/*
|
|
* Process a beacon or probe response frame.
|
|
*/
|
|
void
|
|
ieee80211_add_scan(struct ieee80211vap *vap,
|
|
struct ieee80211_channel *curchan,
|
|
const struct ieee80211_scanparams *sp,
|
|
const struct ieee80211_frame *wh,
|
|
int subtype, int rssi, int noise)
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
|
|
return (ic->ic_scan_methods->sc_add_scan(vap, curchan, sp, wh, subtype,
|
|
rssi, noise));
|
|
}
|
|
|
|
/*
|
|
* Timeout/age scan cache entries; called from sta timeout
|
|
* timer (XXX should be self-contained).
|
|
*/
|
|
void
|
|
ieee80211_scan_timeout(struct ieee80211com *ic)
|
|
{
|
|
struct ieee80211_scan_state *ss = ic->ic_scan;
|
|
|
|
if (ss->ss_ops != NULL)
|
|
ss->ss_ops->scan_age(ss);
|
|
}
|
|
|
|
/*
|
|
* Mark a scan cache entry after a successful associate.
|
|
*/
|
|
void
|
|
ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[])
|
|
{
|
|
struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan;
|
|
|
|
if (ss->ss_ops != NULL) {
|
|
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN,
|
|
mac, "%s", __func__);
|
|
ss->ss_ops->scan_assoc_success(ss, mac);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Demerit a scan cache entry after failing to associate.
|
|
*/
|
|
void
|
|
ieee80211_scan_assoc_fail(struct ieee80211vap *vap,
|
|
const uint8_t mac[], int reason)
|
|
{
|
|
struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan;
|
|
|
|
if (ss->ss_ops != NULL) {
|
|
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac,
|
|
"%s: reason %u", __func__, reason);
|
|
ss->ss_ops->scan_assoc_fail(ss, mac, reason);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Iterate over the contents of the scan cache.
|
|
*/
|
|
void
|
|
ieee80211_scan_iterate(struct ieee80211vap *vap,
|
|
ieee80211_scan_iter_func *f, void *arg)
|
|
{
|
|
struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan;
|
|
|
|
if (ss->ss_ops != NULL)
|
|
ss->ss_ops->scan_iterate(ss, f, arg);
|
|
}
|
|
|
|
/*
|
|
* Flush the contents of the scan cache.
|
|
*/
|
|
void
|
|
ieee80211_scan_flush(struct ieee80211vap *vap)
|
|
{
|
|
struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan;
|
|
|
|
if (ss->ss_ops != NULL && ss->ss_vap == vap) {
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__);
|
|
ss->ss_ops->scan_flush(ss);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check the scan cache for an ap/channel to use; if that
|
|
* fails then kick off a new scan.
|
|
*/
|
|
struct ieee80211_channel *
|
|
ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags)
|
|
{
|
|
struct ieee80211_scan_state *ss = ic->ic_scan;
|
|
|
|
IEEE80211_LOCK_ASSERT(ic);
|
|
|
|
if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) {
|
|
/* XXX printf? */
|
|
return NULL;
|
|
}
|
|
if (ss->ss_ops->scan_pickchan == NULL) {
|
|
IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN,
|
|
"%s: scan module does not support picking a channel, "
|
|
"opmode %s\n", __func__, ss->ss_vap->iv_opmode);
|
|
return NULL;
|
|
}
|
|
return ss->ss_ops->scan_pickchan(ss, flags);
|
|
}
|