2668f9825b
Requested by: sam
1234 lines
35 KiB
C
1234 lines
35 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/kernel.h>
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#include <sys/socket.h>
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#include <net/if.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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#include <net/bpf.h>
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struct scan_state {
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struct ieee80211_scan_state base; /* public state */
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u_int ss_iflags; /* flags used internally */
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#define ISCAN_MINDWELL 0x0001 /* min dwell time reached */
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#define ISCAN_DISCARD 0x0002 /* discard rx'd frames */
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#define ISCAN_CANCEL 0x0004 /* cancel current scan */
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#define ISCAN_START 0x0008 /* 1st time through next_scan */
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unsigned long ss_chanmindwell; /* min dwell on curchan */
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unsigned long ss_scanend; /* time scan must stop */
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u_int ss_duration; /* duration for next scan */
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struct callout ss_scan_timer; /* scan timer */
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};
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#define SCAN_PRIVATE(ss) ((struct scan_state *) ss)
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/*
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* Amount of time to go off-channel during a background
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* scan. This value should be large enough to catch most
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* ap's but short enough that we can return on-channel
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* before our listen interval expires.
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*
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* XXX tunable
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* XXX check against configured listen interval
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*/
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#define IEEE80211_SCAN_OFFCHANNEL msecs_to_ticks(150)
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/*
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* Roaming-related defaults. RSSI thresholds are as returned by the
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* driver (dBm). 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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#define ROAM_RSSI_11A_DEFAULT 14 /* rssi threshold for 11a bss */
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#define ROAM_RSSI_11B_DEFAULT 14 /* rssi threshold for 11b bss */
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#define ROAM_RSSI_11BONLY_DEFAULT 14 /* rssi threshold for 11b-only bss */
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#define ROAM_RATE_11A_DEFAULT 2*12 /* tx rate thresh for 11a bss */
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#define ROAM_RATE_11B_DEFAULT 2*5 /* tx rate thresh for 11b bss */
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#define ROAM_RATE_11BONLY_DEFAULT 2*1 /* tx rate thresh for 11b-only bss */
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#define ROAM_MCS_11N_DEFAULT 1 /* tx MCS thresh for 11n bss*/
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static void scan_restart_pwrsav(void *);
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static void scan_curchan(struct ieee80211_scan_state *, unsigned long);
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static void scan_mindwell(struct ieee80211_scan_state *);
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static void scan_next(void *);
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MALLOC_DEFINE(M_80211_SCAN, "80211scan", "802.11 scan state");
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void
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ieee80211_scan_attach(struct ieee80211com *ic)
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{
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struct scan_state *ss;
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MALLOC(ss, struct scan_state *, sizeof(struct scan_state),
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M_80211_SCAN, M_NOWAIT | M_ZERO);
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if (ss == NULL) {
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ic->ic_scan = NULL;
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return;
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}
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callout_init_mtx(&ss->ss_scan_timer, IEEE80211_LOCK_OBJ(ic), 0);
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ic->ic_scan = &ss->base;
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ic->ic_scan_curchan = scan_curchan;
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ic->ic_scan_mindwell = scan_mindwell;
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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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struct ieee80211_scan_state *ss = ic->ic_scan;
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if (ss != NULL) {
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callout_drain(&SCAN_PRIVATE(ss)->ss_scan_timer);
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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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ic->ic_flags &= ~IEEE80211_F_SCAN;
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ic->ic_scan = NULL;
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FREE(SCAN_PRIVATE(ss), M_80211_SCAN);
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}
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}
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static __inline void
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setparams(struct ieee80211_roamparam *rp, int8_t rssi, uint8_t txrate)
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{
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rp->rssi = rssi;
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rp->rate = txrate;
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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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/* NB: only set supported modes so user apps can identify */
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if (isset(ic->ic_modecaps, IEEE80211_MODE_11A))
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setparams(&vap->iv_roamparms[IEEE80211_MODE_11A],
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ROAM_RSSI_11A_DEFAULT, ROAM_RATE_11A_DEFAULT);
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if (isset(ic->ic_modecaps, IEEE80211_MODE_11G))
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setparams(&vap->iv_roamparms[IEEE80211_MODE_11G],
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ROAM_RSSI_11B_DEFAULT, ROAM_RATE_11B_DEFAULT);
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if (isset(ic->ic_modecaps, IEEE80211_MODE_11B))
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setparams(&vap->iv_roamparms[IEEE80211_MODE_11B],
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ROAM_RSSI_11BONLY_DEFAULT, ROAM_RATE_11BONLY_DEFAULT);
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/* NB: default turbo controls to be the same as !turbo */
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if (isset(ic->ic_modecaps, IEEE80211_MODE_TURBO_A))
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vap->iv_roamparms[IEEE80211_MODE_TURBO_A] =
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vap->iv_roamparms[IEEE80211_MODE_11A];
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if (isset(ic->ic_modecaps, IEEE80211_MODE_TURBO_G))
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vap->iv_roamparms[IEEE80211_MODE_TURBO_G] =
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vap->iv_roamparms[IEEE80211_MODE_11G];
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if (isset(ic->ic_modecaps, IEEE80211_MODE_STURBO_A))
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vap->iv_roamparms[IEEE80211_MODE_STURBO_A] =
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vap->iv_roamparms[IEEE80211_MODE_11A];
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if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
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setparams(&vap->iv_roamparms[IEEE80211_MODE_11NA],
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ROAM_RSSI_11A_DEFAULT, ROAM_MCS_11N_DEFAULT | 0x80);
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if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
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setparams(&vap->iv_roamparms[IEEE80211_MODE_11NG],
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ROAM_RSSI_11B_DEFAULT, ROAM_MCS_11N_DEFAULT | 0x80);
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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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if (ss != NULL && ss->ss_vap == vap) {
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if (ic->ic_flags & IEEE80211_F_SCAN) {
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/* XXX callout_drain */
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callout_stop(&SCAN_PRIVATE(ss)->ss_scan_timer);
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ic->ic_flags &= ~IEEE80211_F_SCAN;
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}
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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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};
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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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static void
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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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static void
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change_channel(struct ieee80211com *ic,
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struct ieee80211_channel *chan)
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{
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ic->ic_curchan = chan;
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ic->ic_set_channel(ic);
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}
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static char
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channel_type(const struct ieee80211_channel *c)
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{
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if (IEEE80211_IS_CHAN_ST(c))
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return 'S';
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if (IEEE80211_IS_CHAN_108A(c))
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return 'T';
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if (IEEE80211_IS_CHAN_108G(c))
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return 'G';
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if (IEEE80211_IS_CHAN_HT(c))
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return 'n';
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if (IEEE80211_IS_CHAN_A(c))
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return 'a';
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if (IEEE80211_IS_CHAN_ANYG(c))
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return 'g';
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if (IEEE80211_IS_CHAN_B(c))
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return 'b';
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return 'f';
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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_vap->iv_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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channel_type(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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static void
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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 %lu max %lu\n", ss->ss_mindwell, ss->ss_maxdwell);
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}
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#endif /* IEEE80211_DEBUG */
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/*
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* Enable station power save mode and start/restart the scanning thread.
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*/
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static void
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scan_restart_pwrsav(void *arg)
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{
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struct scan_state *ss = (struct scan_state *) arg;
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struct ieee80211vap *vap = ss->base.ss_vap;
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struct ieee80211com *ic = vap->iv_ic;
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int ticksdelay;
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ieee80211_sta_pwrsave(vap, 1);
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/*
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* Use an initial 1ms delay so the null
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* data frame has a chance to go out.
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* XXX 1ms is a lot, better to trigger scan
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* on tx complete.
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*/
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ticksdelay = msecs_to_ticks(1);
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if (ticksdelay < 1)
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ticksdelay = 1;
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ic->ic_scan_start(ic); /* notify driver */
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ss->ss_scanend = ticks + ticksdelay + ss->ss_duration;
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ss->ss_iflags |= ISCAN_START;
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callout_reset(&ss->ss_scan_timer, ticksdelay, scan_next, ss);
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}
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/*
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* Start/restart scanning. If we're operating in station mode
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* and associated notify the ap we're going into power save mode
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* and schedule a callback to initiate the work (where there's a
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* better context for doing the work). Otherwise, start the scan
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* directly.
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*/
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static int
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scan_restart(struct scan_state *ss, u_int duration)
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{
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struct ieee80211vap *vap = ss->base.ss_vap;
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struct ieee80211com *ic = vap->iv_ic;
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int defer = 0;
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if (ss->base.ss_next == ss->base.ss_last) {
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
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"%s: no channels to scan\n", __func__);
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return 0;
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}
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if (vap->iv_opmode == IEEE80211_M_STA &&
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vap->iv_state == IEEE80211_S_RUN) {
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if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) {
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/*
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* Initiate power save before going off-channel.
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* Note that we cannot do this directly because
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* of locking issues; instead we defer it to a
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* tasklet.
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*/
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ss->ss_duration = duration;
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defer = 1;
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}
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}
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if (!defer) {
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ic->ic_scan_start(ic); /* notify driver */
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ss->ss_scanend = ticks + duration;
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ss->ss_iflags |= ISCAN_START;
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callout_reset(&ss->ss_scan_timer, 0, scan_next, ss);
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} else
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scan_restart_pwrsav(ss);
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return 1;
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}
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static void
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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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static int
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start_scan_locked(const struct ieee80211_scanner *scan,
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struct ieee80211vap *vap, int flags, u_int duration,
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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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IEEE80211_LOCK_ASSERT(ic);
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if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
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"%s: scan inhibited by pending channel change\n", __func__);
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} else if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
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"%s: %s scan, duration %u mindwell %u maxdwell %u, desired mode %s, %s%s%s%s%s%s\n"
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, __func__
|
|
, flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"
|
|
, duration, mindwell, maxdwell
|
|
, ieee80211_phymode_name[vap->iv_des_mode]
|
|
, flags & IEEE80211_SCAN_FLUSH ? "flush" : "append"
|
|
, flags & IEEE80211_SCAN_NOPICK ? ", nopick" : ""
|
|
, flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : ""
|
|
, flags & IEEE80211_SCAN_NOBCAST ? ", nobcast" : ""
|
|
, flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : ""
|
|
, flags & IEEE80211_SCAN_ONCE ? ", once" : ""
|
|
);
|
|
|
|
scan_update_locked(vap, scan);
|
|
if (ss->ss_ops != NULL) {
|
|
if ((flags & IEEE80211_SCAN_NOSSID) == 0)
|
|
copy_ssid(vap, ss, nssid, ssids);
|
|
|
|
/* NB: top 4 bits for internal use */
|
|
ss->ss_flags = flags & 0xfff;
|
|
if (ss->ss_flags & IEEE80211_SCAN_ACTIVE)
|
|
vap->iv_stats.is_scan_active++;
|
|
else
|
|
vap->iv_stats.is_scan_passive++;
|
|
if (flags & IEEE80211_SCAN_FLUSH)
|
|
ss->ss_ops->scan_flush(ss);
|
|
|
|
/* NB: flush frames rx'd before 1st channel change */
|
|
SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD;
|
|
ss->ss_next = 0;
|
|
ss->ss_mindwell = mindwell;
|
|
ss->ss_maxdwell = maxdwell;
|
|
ss->ss_ops->scan_start(ss, vap);
|
|
#ifdef IEEE80211_DEBUG
|
|
if (ieee80211_msg_scan(vap))
|
|
scan_dump(ss);
|
|
#endif /* IEEE80211_DEBUG */
|
|
if (scan_restart(SCAN_PRIVATE(ss), duration))
|
|
ic->ic_flags |= IEEE80211_F_SCAN;
|
|
}
|
|
} else {
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: %s scan already in progress\n", __func__,
|
|
ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive");
|
|
}
|
|
return (ic->ic_flags & IEEE80211_F_SCAN);
|
|
}
|
|
|
|
/*
|
|
* Start a scan unless one is already going.
|
|
*/
|
|
int
|
|
ieee80211_start_scan(struct ieee80211vap *vap, int flags,
|
|
u_int duration, u_int mindwell, u_int maxdwell,
|
|
u_int nssid, const struct ieee80211_scan_ssid ssids[])
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
const struct ieee80211_scanner *scan;
|
|
int result;
|
|
|
|
scan = ieee80211_scanner_get(vap->iv_opmode);
|
|
if (scan == NULL) {
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: no scanner support for %s mode\n",
|
|
__func__, ieee80211_opmode_name[vap->iv_opmode]);
|
|
/* XXX stat */
|
|
return 0;
|
|
}
|
|
|
|
IEEE80211_LOCK(ic);
|
|
result = start_scan_locked(scan, vap, flags, duration,
|
|
mindwell, maxdwell, nssid, ssids);
|
|
IEEE80211_UNLOCK(ic);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Check the scan cache for an ap/channel to use; if that
|
|
* fails then kick off a new scan.
|
|
*/
|
|
int
|
|
ieee80211_check_scan(struct ieee80211vap *vap, int flags,
|
|
u_int duration, u_int mindwell, u_int maxdwell,
|
|
u_int nssid, const struct ieee80211_scan_ssid ssids[])
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
struct ieee80211_scan_state *ss = ic->ic_scan;
|
|
const struct ieee80211_scanner *scan;
|
|
int result;
|
|
|
|
scan = ieee80211_scanner_get(vap->iv_opmode);
|
|
if (scan == NULL) {
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: no scanner support for %s mode\n",
|
|
__func__, vap->iv_opmode);
|
|
/* XXX stat */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check if there's a list of scan candidates already.
|
|
* XXX want more than the ap we're currently associated with
|
|
*/
|
|
|
|
IEEE80211_LOCK(ic);
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: %s scan, %s%s%s%s%s\n"
|
|
, __func__
|
|
, flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"
|
|
, flags & IEEE80211_SCAN_FLUSH ? "flush" : "append"
|
|
, flags & IEEE80211_SCAN_NOPICK ? ", nopick" : ""
|
|
, flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : ""
|
|
, flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : ""
|
|
, flags & IEEE80211_SCAN_ONCE ? ", once" : ""
|
|
);
|
|
|
|
if (ss->ss_ops != scan) {
|
|
/* XXX re-use cache contents? e.g. adhoc<->sta */
|
|
flags |= IEEE80211_SCAN_FLUSH;
|
|
}
|
|
scan_update_locked(vap, scan);
|
|
if (ss->ss_ops != NULL) {
|
|
/* XXX verify ss_ops matches vap->iv_opmode */
|
|
if ((flags & IEEE80211_SCAN_NOSSID) == 0) {
|
|
/*
|
|
* Update the ssid list and mark flags so if
|
|
* we call start_scan it doesn't duplicate work.
|
|
*/
|
|
copy_ssid(vap, ss, nssid, ssids);
|
|
flags |= IEEE80211_SCAN_NOSSID;
|
|
}
|
|
if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 &&
|
|
(flags & IEEE80211_SCAN_FLUSH) == 0 &&
|
|
time_before(ticks, ic->ic_lastscan + vap->iv_scanvalid)) {
|
|
/*
|
|
* We're not currently scanning and the cache is
|
|
* deemed hot enough to consult. Lock out others
|
|
* by marking IEEE80211_F_SCAN while we decide if
|
|
* something is already in the scan cache we can
|
|
* use. Also discard any frames that might come
|
|
* in while temporarily marked as scanning.
|
|
*/
|
|
SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD;
|
|
ic->ic_flags |= IEEE80211_F_SCAN;
|
|
|
|
/* NB: need to use supplied flags in check */
|
|
ss->ss_flags = flags & 0xff;
|
|
result = ss->ss_ops->scan_end(ss, vap);
|
|
|
|
ic->ic_flags &= ~IEEE80211_F_SCAN;
|
|
SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_DISCARD;
|
|
if (result) {
|
|
ieee80211_notify_scan_done(vap);
|
|
IEEE80211_UNLOCK(ic);
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
result = start_scan_locked(scan, vap, flags, duration,
|
|
mindwell, maxdwell, nssid, ssids);
|
|
IEEE80211_UNLOCK(ic);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Check the scan cache for an ap/channel to use; if that fails
|
|
* then kick off a scan using the current settings.
|
|
*/
|
|
int
|
|
ieee80211_check_scan_current(struct ieee80211vap *vap)
|
|
{
|
|
return ieee80211_check_scan(vap,
|
|
IEEE80211_SCAN_ACTIVE,
|
|
IEEE80211_SCAN_FOREVER, 0, 0,
|
|
vap->iv_des_nssid, vap->iv_des_ssid);
|
|
}
|
|
|
|
/*
|
|
* Restart a previous scan. If the previous scan completed
|
|
* then we start again using the existing channel list.
|
|
*/
|
|
int
|
|
ieee80211_bg_scan(struct ieee80211vap *vap, int flags)
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
struct ieee80211_scan_state *ss = ic->ic_scan;
|
|
const struct ieee80211_scanner *scan;
|
|
|
|
scan = ieee80211_scanner_get(vap->iv_opmode);
|
|
if (scan == NULL) {
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: no scanner support for %s mode\n",
|
|
__func__, vap->iv_opmode);
|
|
/* XXX stat */
|
|
return 0;
|
|
}
|
|
|
|
IEEE80211_LOCK(ic);
|
|
if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
|
|
u_int duration;
|
|
/*
|
|
* Go off-channel for a fixed interval that is large
|
|
* enough to catch most ap's but short enough that
|
|
* we can return on-channel before our listen interval
|
|
* expires.
|
|
*/
|
|
duration = IEEE80211_SCAN_OFFCHANNEL;
|
|
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: %s scan, ticks %u duration %lu\n", __func__,
|
|
ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive",
|
|
ticks, duration);
|
|
|
|
scan_update_locked(vap, scan);
|
|
if (ss->ss_ops != NULL) {
|
|
ss->ss_vap = vap;
|
|
/*
|
|
* A background scan does not select a new sta; it
|
|
* just refreshes the scan cache. Also, indicate
|
|
* the scan logic should follow the beacon schedule:
|
|
* we go off-channel and scan for a while, then
|
|
* return to the bss channel to receive a beacon,
|
|
* then go off-channel again. All during this time
|
|
* we notify the ap we're in power save mode. When
|
|
* the scan is complete we leave power save mode.
|
|
* If any beacon indicates there are frames pending
|
|
* for us then we drop out of power save mode
|
|
* (and background scan) automatically by way of the
|
|
* usual sta power save logic.
|
|
*/
|
|
ss->ss_flags |= IEEE80211_SCAN_NOPICK
|
|
| IEEE80211_SCAN_BGSCAN
|
|
| flags
|
|
;
|
|
/* if previous scan completed, restart */
|
|
if (ss->ss_next >= ss->ss_last) {
|
|
if (ss->ss_flags & IEEE80211_SCAN_ACTIVE)
|
|
vap->iv_stats.is_scan_active++;
|
|
else
|
|
vap->iv_stats.is_scan_passive++;
|
|
/*
|
|
* NB: beware of the scan cache being flushed;
|
|
* if the channel list is empty use the
|
|
* scan_start method to populate it.
|
|
*/
|
|
ss->ss_next = 0;
|
|
if (ss->ss_last != 0)
|
|
ss->ss_ops->scan_restart(ss, vap);
|
|
else {
|
|
ss->ss_ops->scan_start(ss, vap);
|
|
#ifdef IEEE80211_DEBUG
|
|
if (ieee80211_msg_scan(vap))
|
|
scan_dump(ss);
|
|
#endif /* IEEE80211_DEBUG */
|
|
}
|
|
}
|
|
/* NB: flush frames rx'd before 1st channel change */
|
|
SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD;
|
|
ss->ss_maxdwell = duration;
|
|
if (scan_restart(SCAN_PRIVATE(ss), duration)) {
|
|
ic->ic_flags |= IEEE80211_F_SCAN;
|
|
ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN;
|
|
}
|
|
} else {
|
|
/* XXX msg+stat */
|
|
}
|
|
} else {
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: %s scan already in progress\n", __func__,
|
|
ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive");
|
|
}
|
|
IEEE80211_UNLOCK(ic);
|
|
|
|
/* NB: racey, does it matter? */
|
|
return (ic->ic_flags & IEEE80211_F_SCAN);
|
|
}
|
|
|
|
/*
|
|
* Cancel any scan currently going on for the specified vap.
|
|
*/
|
|
void
|
|
ieee80211_cancel_scan(struct ieee80211vap *vap)
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
struct ieee80211_scan_state *ss = ic->ic_scan;
|
|
|
|
IEEE80211_LOCK(ic);
|
|
if ((ic->ic_flags & IEEE80211_F_SCAN) &&
|
|
ss->ss_vap == vap &&
|
|
(SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) {
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: cancel %s scan\n", __func__,
|
|
ss->ss_flags & IEEE80211_SCAN_ACTIVE ?
|
|
"active" : "passive");
|
|
|
|
/* clear bg scan NOPICK and mark cancel request */
|
|
ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
|
|
SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL;
|
|
/* force it to fire asap */
|
|
callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer,
|
|
0, scan_next, ss);
|
|
}
|
|
IEEE80211_UNLOCK(ic);
|
|
}
|
|
|
|
/*
|
|
* Cancel any scan currently going on.
|
|
*/
|
|
void
|
|
ieee80211_cancel_anyscan(struct ieee80211vap *vap)
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
struct ieee80211_scan_state *ss = ic->ic_scan;
|
|
|
|
IEEE80211_LOCK(ic);
|
|
if ((ic->ic_flags & IEEE80211_F_SCAN) &&
|
|
(SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) {
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: cancel %s scan\n", __func__,
|
|
ss->ss_flags & IEEE80211_SCAN_ACTIVE ?
|
|
"active" : "passive");
|
|
|
|
/* clear bg scan NOPICK and mark cancel request */
|
|
ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
|
|
SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL;
|
|
/* force it to fire asap */
|
|
callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer,
|
|
0, scan_next, ss);
|
|
}
|
|
IEEE80211_UNLOCK(ic);
|
|
}
|
|
|
|
/*
|
|
* Public access to scan_next for drivers that manage
|
|
* scanning themselves (e.g. for firmware-based devices).
|
|
*/
|
|
void
|
|
ieee80211_scan_next(struct ieee80211vap *vap)
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
struct ieee80211_scan_state *ss = ic->ic_scan;
|
|
|
|
callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 0, scan_next, ss);
|
|
}
|
|
|
|
/*
|
|
* Public access to scan_next for drivers that are not able to scan single
|
|
* channels (e.g. for firmware-based devices).
|
|
*/
|
|
void
|
|
ieee80211_scan_done(struct ieee80211vap *vap)
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
struct ieee80211_scan_state *ss;
|
|
|
|
IEEE80211_LOCK(ic);
|
|
ss = ic->ic_scan;
|
|
ss->ss_next = ss->ss_last; /* all channels are complete */
|
|
scan_next(ss);
|
|
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;
|
|
struct ieee80211_scan_state *ss = ic->ic_scan;
|
|
struct ifnet *ifp = vap->iv_ifp;
|
|
int i;
|
|
|
|
if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) {
|
|
ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN;
|
|
return;
|
|
}
|
|
/*
|
|
* Send directed probe requests followed by any
|
|
* broadcast probe request.
|
|
* XXX remove dependence on ic/vap->iv_bss
|
|
*/
|
|
for (i = 0; i < ss->ss_nssid; i++)
|
|
ieee80211_send_probereq(vap->iv_bss,
|
|
vap->iv_myaddr, ifp->if_broadcastaddr,
|
|
ifp->if_broadcastaddr,
|
|
ss->ss_ssid[i].ssid, ss->ss_ssid[i].len);
|
|
if ((ss->ss_flags & IEEE80211_SCAN_NOBCAST) == 0)
|
|
ieee80211_send_probereq(vap->iv_bss,
|
|
vap->iv_myaddr, ifp->if_broadcastaddr,
|
|
ifp->if_broadcastaddr,
|
|
"", 0);
|
|
}
|
|
|
|
/*
|
|
* Scan curchan. If this is an active scan and the channel
|
|
* is not marked passive then send probe request frame(s).
|
|
* Arrange for the channel change after maxdwell ticks.
|
|
*/
|
|
static void
|
|
scan_curchan(struct ieee80211_scan_state *ss, unsigned long maxdwell)
|
|
{
|
|
struct ieee80211vap *vap = ss->ss_vap;
|
|
|
|
IEEE80211_LOCK_ASSERT(vap->iv_ic);
|
|
|
|
if (ss->ss_flags & IEEE80211_SCAN_ACTIVE)
|
|
ieee80211_probe_curchan(vap, 0);
|
|
callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer,
|
|
maxdwell, scan_next, ss);
|
|
}
|
|
|
|
/*
|
|
* Handle mindwell requirements completed; initiate a channel
|
|
* change to the next channel asap.
|
|
*/
|
|
static void
|
|
scan_mindwell(struct ieee80211_scan_state *ss)
|
|
{
|
|
callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 0, scan_next, ss);
|
|
}
|
|
|
|
/*
|
|
* Switch to the next channel marked for scanning.
|
|
*/
|
|
static void
|
|
scan_next(void *arg)
|
|
{
|
|
#define ISCAN_REP (ISCAN_MINDWELL | ISCAN_START | ISCAN_DISCARD)
|
|
struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg;
|
|
struct ieee80211vap *vap = ss->ss_vap;
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
struct ieee80211_channel *chan;
|
|
unsigned long maxdwell, scanend;
|
|
int scandone;
|
|
|
|
IEEE80211_LOCK_ASSERT(ic);
|
|
|
|
if ((ic->ic_flags & IEEE80211_F_SCAN) == 0)
|
|
return;
|
|
again:
|
|
scandone = (ss->ss_next >= ss->ss_last) ||
|
|
(SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0;
|
|
scanend = SCAN_PRIVATE(ss)->ss_scanend;
|
|
if (!scandone &&
|
|
(ss->ss_flags & IEEE80211_SCAN_GOTPICK) == 0 &&
|
|
((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_START) ||
|
|
time_before(ticks + ss->ss_mindwell, scanend))) {
|
|
chan = ss->ss_chans[ss->ss_next++];
|
|
|
|
/*
|
|
* Watch for truncation due to the scan end time.
|
|
*/
|
|
if (time_after(ticks + ss->ss_maxdwell, scanend))
|
|
maxdwell = scanend - ticks;
|
|
else
|
|
maxdwell = ss->ss_maxdwell;
|
|
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: chan %3d%c -> %3d%c [%s, dwell min %lu max %lu]\n",
|
|
__func__,
|
|
ieee80211_chan2ieee(ic, ic->ic_curchan),
|
|
channel_type(ic->ic_curchan),
|
|
ieee80211_chan2ieee(ic, chan), channel_type(chan),
|
|
(ss->ss_flags & IEEE80211_SCAN_ACTIVE) &&
|
|
(chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 ?
|
|
"active" : "passive",
|
|
ss->ss_mindwell, maxdwell);
|
|
|
|
/*
|
|
* Potentially change channel and phy mode.
|
|
*/
|
|
change_channel(ic, chan);
|
|
|
|
/*
|
|
* Scan curchan. Drivers for "intelligent hardware"
|
|
* override ic_scan_curchan to tell the device to do
|
|
* the work. Otherwise we manage the work outselves;
|
|
* sending a probe request (as needed), and arming the
|
|
* timeout to switch channels after maxdwell ticks.
|
|
*/
|
|
ic->ic_scan_curchan(ss, maxdwell);
|
|
|
|
SCAN_PRIVATE(ss)->ss_chanmindwell = ticks + ss->ss_mindwell;
|
|
/* clear mindwell lock and initial channel change flush */
|
|
SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP;
|
|
} else {
|
|
ic->ic_scan_end(ic); /* notify driver */
|
|
/*
|
|
* Record scan complete time. Note that we also do
|
|
* this when canceled so any background scan will
|
|
* not be restarted for a while.
|
|
*/
|
|
if (scandone)
|
|
ic->ic_lastscan = ticks;
|
|
/* return to the bss channel */
|
|
if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
|
|
ic->ic_curchan != ic->ic_bsschan)
|
|
ieee80211_setcurchan(ic, ic->ic_bsschan);
|
|
/* clear internal flags and any indication of a pick */
|
|
SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP;
|
|
ss->ss_flags &= ~IEEE80211_SCAN_GOTPICK;
|
|
|
|
/*
|
|
* If not canceled and scan completed, do post-processing.
|
|
* If the callback function returns 0, then it wants to
|
|
* continue/restart scanning. Unfortunately we needed to
|
|
* notify the driver to end the scan above to avoid having
|
|
* rx frames alter the scan candidate list.
|
|
*/
|
|
if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0 &&
|
|
!ss->ss_ops->scan_end(ss, vap) &&
|
|
(ss->ss_flags & IEEE80211_SCAN_ONCE) == 0 &&
|
|
time_before(ticks + ss->ss_mindwell, scanend)) {
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: done, restart "
|
|
"[ticks %u, dwell min %lu scanend %lu]\n",
|
|
__func__,
|
|
ticks, ss->ss_mindwell, scanend);
|
|
ss->ss_next = 0; /* reset to begining */
|
|
if (ss->ss_flags & IEEE80211_SCAN_ACTIVE)
|
|
vap->iv_stats.is_scan_active++;
|
|
else
|
|
vap->iv_stats.is_scan_passive++;
|
|
|
|
ss->ss_ops->scan_restart(ss, vap); /* XXX? */
|
|
ic->ic_scan_start(ic); /* notify driver */
|
|
goto again;
|
|
} else {
|
|
/* past here, scandone is ``true'' if not in bg mode */
|
|
if ((ss->ss_flags & IEEE80211_SCAN_BGSCAN) == 0)
|
|
scandone = 1;
|
|
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: %s, "
|
|
"[ticks %u, dwell min %lu scanend %lu]\n",
|
|
__func__, scandone ? "done" : "stopped",
|
|
ticks, ss->ss_mindwell, scanend);
|
|
|
|
/*
|
|
* Clear the SCAN bit first in case frames are
|
|
* pending on the station power save queue. If
|
|
* we defer this then the dispatch of the frames
|
|
* may generate a request to cancel scanning.
|
|
*/
|
|
ic->ic_flags &= ~IEEE80211_F_SCAN;
|
|
/*
|
|
* Drop out of power save mode when a scan has
|
|
* completed. If this scan was prematurely terminated
|
|
* because it is a background scan then don't notify
|
|
* the ap; we'll either return to scanning after we
|
|
* receive the beacon frame or we'll drop out of power
|
|
* save mode because the beacon indicates we have frames
|
|
* waiting for us.
|
|
*/
|
|
if (scandone) {
|
|
ieee80211_sta_pwrsave(vap, 0);
|
|
if (ss->ss_next >= ss->ss_last) {
|
|
ieee80211_notify_scan_done(vap);
|
|
ic->ic_flags_ext &= ~IEEE80211_FEXT_BGSCAN;
|
|
}
|
|
}
|
|
SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_CANCEL;
|
|
ss->ss_flags &=
|
|
~(IEEE80211_SCAN_ONCE | IEEE80211_SCAN_PICK1ST);
|
|
}
|
|
}
|
|
#undef ISCAN_REP
|
|
}
|
|
|
|
#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("]");
|
|
}
|
|
|
|
static void
|
|
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,
|
|
const struct ieee80211_scanparams *sp,
|
|
const struct ieee80211_frame *wh,
|
|
int subtype, int rssi, int noise, int rstamp)
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
struct ieee80211_scan_state *ss = ic->ic_scan;
|
|
|
|
/* XXX locking */
|
|
/*
|
|
* Frames received during startup are discarded to avoid
|
|
* using scan state setup on the initial entry to the timer
|
|
* callback. This can occur because the device may enable
|
|
* rx prior to our doing the initial channel change in the
|
|
* timer routine.
|
|
*/
|
|
if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_DISCARD)
|
|
return;
|
|
#ifdef IEEE80211_DEBUG
|
|
if (ieee80211_msg_scan(vap) && (ic->ic_flags & IEEE80211_F_SCAN))
|
|
dump_probe_beacon(subtype, 1, wh->i_addr2, sp, rssi);
|
|
#endif
|
|
if (ss->ss_ops != NULL &&
|
|
ss->ss_ops->scan_add(ss, sp, wh, subtype, rssi, noise, rstamp)) {
|
|
/*
|
|
* If we've reached the min dwell time terminate
|
|
* the timer so we'll switch to the next channel.
|
|
*/
|
|
if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_MINDWELL) == 0 &&
|
|
time_after_eq(ticks, SCAN_PRIVATE(ss)->ss_chanmindwell)) {
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
|
|
"%s: chan %3d%c min dwell met (%u > %lu)\n",
|
|
__func__,
|
|
ieee80211_chan2ieee(ic, ic->ic_curchan),
|
|
channel_type(ic->ic_curchan),
|
|
ticks, SCAN_PRIVATE(ss)->ss_chanmindwell);
|
|
SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_MINDWELL;
|
|
/*
|
|
* NB: trigger at next clock tick or wait for the
|
|
* hardware.
|
|
*/
|
|
ic->ic_scan_mindwell(ss);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|