void
ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss)
{
struct ieee80211com *ic = ss->ss_ic;
const char *sep;
int i;
sep = "";
for (i = ss->ss_next; i < ss->ss_last; i++) {
const struct ieee80211_channel *c = ss->ss_chans[i];
printf("%s%u%c", sep, ieee80211_chan2ieee(ic, c),
ieee80211_channel_type_char(c));
sep = ", ";
}
}
/*
* Process a beacon or probe response frame.
*/
static void
ieee80211_swscan_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;
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))
ieee80211_scan_dump_probe_beacon(subtype, 1, wh->i_addr2, sp, rssi);
#endif
if (ss->ss_ops != NULL &&
ss->ss_ops->scan_add(ss, curchan, sp, wh, subtype, rssi, noise)) {
/*
* 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 &&
ieee80211_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),
ieee80211_channel_type_char(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);
}
}
}
static void
scan_curchan_task(void *arg, int pending)
{
struct ieee80211_scan_state *ss = arg;
struct scan_state *ss_priv = SCAN_PRIVATE(ss);
struct ieee80211com *ic = ss->ss_ic;
struct ieee80211_channel *chan;
unsigned long maxdwell;
int scandone;
IEEE80211_LOCK(ic);
end:
scandone = (ss->ss_next >= ss->ss_last) ||
(ss_priv->ss_iflags & ISCAN_CANCEL) != 0;
IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN,
"%s: loop start; scandone=%d\n",
__func__,
scandone);
if (scandone || (ss->ss_flags & IEEE80211_SCAN_GOTPICK) ||
(ss_priv->ss_iflags & ISCAN_ABORT) ||
ieee80211_time_after(ticks + ss->ss_mindwell, ss_priv->ss_scanend)) {
ss_priv->ss_iflags &= ~ISCAN_RUNNING;
scan_end(ss, scandone);
return;
} else
ss_priv->ss_iflags |= ISCAN_RUNNING;
chan = ss->ss_chans[ss->ss_next++];
/*
* Watch for truncation due to the scan end time.
*/
if (ieee80211_time_after(ticks + ss->ss_maxdwell, ss_priv->ss_scanend))
maxdwell = ss_priv->ss_scanend - ticks;
else
maxdwell = ss->ss_maxdwell;
IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN,
"%s: chan %3d%c -> %3d%c [%s, dwell min %lums max %lums]\n",
__func__,
ieee80211_chan2ieee(ic, ic->ic_curchan),
ieee80211_channel_type_char(ic->ic_curchan),
ieee80211_chan2ieee(ic, chan),
ieee80211_channel_type_char(chan),
(ss->ss_flags & IEEE80211_SCAN_ACTIVE) &&
(chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 ?
"active" : "passive",
ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(maxdwell));
/*
* Potentially change channel and phy mode.
*/
ic->ic_curchan = chan;
ic->ic_rt = ieee80211_get_ratetable(chan);
IEEE80211_UNLOCK(ic);
/*
* Perform the channel change and scan unlocked so the driver
* may sleep. Once set_channel returns the hardware has
* completed the channel change.
*/
ic->ic_set_channel(ic);
ieee80211_radiotap_chan_change(ic);
/*
* Scan curchan. Drivers for "intelligent hardware"
* override ic_scan_curchan to tell the device to do
* the work. Otherwise we manage the work ourselves;
* sending a probe request (as needed), and arming the
* timeout to switch channels after maxdwell ticks.
*
* scan_curchan should only pause for the time required to
* prepare/initiate the hardware for the scan (if at all).
*/
ic->ic_scan_curchan(ss, maxdwell);
IEEE80211_LOCK(ic);
/* XXX scan state can change! Re-validate scan state! */
ss_priv->ss_chanmindwell = ticks + ss->ss_mindwell;
/* clear mindwell lock and initial channel change flush */
ss_priv->ss_iflags &= ~ISCAN_REP;
if (ss_priv->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT)) {
taskqueue_cancel_timeout(ic->ic_tq, &ss_priv->ss_scan_curchan,
NULL);
goto end;
}
IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, "%s: waiting\n",
__func__);
IEEE80211_UNLOCK(ic);
}
