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Refactor and split out the net80211 software scan engine from the rest

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of the scan API.

The eventual aim is to have 'ieee80211_scan.c' have the net80211 and
driver facing scan API to start, finish and continue doing scanning
while 'ieee80211_swscan.c' implements the software scanner that
runs the scan task, handles probe request/reply bits, configures
the VAP off-channel, changes channel and does the scanning bits.

For NICs that do no scanning at all, the existing code is needed.
ath(4) and most of the other NICs (dumb USB ones in particular)
do little to no scan offload - it's all done in software.

Some NICs may do single channel at a time scanning; I haven't really
checked them out in detail.

iwn(4), the upcoming 7260 driver stuff, the new Qualcomm Atheros
11ac chipsets and the Atheros mobile/USB full-offload chips all
have complete scan engines in firmware.  We don't have to drive
any of it at all - the firmware just needs to be told what to scan,
when to scan, how long to scan.  It'll take care of going off
channel, pausing TX/RX appropriately, sending sleep notification
to the AP, sending probe requests and handling probe responses.
It'll do passive/active scan itself.  It's almost completely
transparent to the network stack - all we see are scan notifications
when it finishes scanning each channel and beacons/probe responses
when it does its thing.  Once it's done we get a final notification
that the scan is complete, with some scan results in the message.
The iwn(4) NICs handle doing active scanning too as an option
and will handle waiting appropriately on 5GHz passive channels
before active scanning.

There's some more refactoring, tidying up and lock assertions to
sprinkle around to tidy this whole thing up before I turn swscan.c
into another set of ic methods to override by the driver or
alternate scan module.  So in theory this is all one big no-op
commit.  In theory.

Tested:

* iwn(4) 5200, STA mode
* ath(4) 6205, STA mode
* ath(4) - various NICs, AP mode
This commit is contained in:
Adrian Chadd 2015-01-06 02:08:45 +00:00
parent f8c479085f
commit cc6dd788c6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=276730
6 changed files with 1047 additions and 626 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
sys/conf/files
View File

@ -3316,6 +3316,7 @@ net80211/ieee80211_scan_sta.c optional wlan
net80211/ieee80211_sta.c optional wlan \
compile-with "${NORMAL_C} -Wno-unused-function"
net80211/ieee80211_superg.c optional wlan ieee80211_support_superg
net80211/ieee80211_swscan.c optional wlan
net80211/ieee80211_tdma.c optional wlan ieee80211_support_tdma
net80211/ieee80211_wds.c optional wlan
net80211/ieee80211_xauth.c optional wlan wlan_xauth

2
sys/modules/wlan/Makefile
View File

@ -7,7 +7,7 @@ SRCS= ieee80211.c ieee80211_action.c ieee80211_ageq.c \
ieee80211_crypto.c ieee80211_crypto_none.c ieee80211_dfs.c \
ieee80211_freebsd.c ieee80211_input.c ieee80211_ioctl.c \
ieee80211_mesh.c ieee80211_node.c ieee80211_output.c ieee80211_phy.c \
ieee80211_power.c ieee80211_proto.c ieee80211_scan.c \
ieee80211_power.c ieee80211_proto.c ieee80211_scan.c ieee80211_scan_sw.c \
ieee80211_scan_sta.c ieee80211_radiotap.c ieee80211_ratectl.c \
ieee80211_ratectl_none.c ieee80211_regdomain.c \
ieee80211_ht.c ieee80211_hwmp.c ieee80211_adhoc.c ieee80211_hostap.c \

704
sys/net80211/ieee80211_scan.c
View File

@ -46,36 +46,11 @@ __FBSDID("$FreeBSD$");
#include <net80211/ieee80211_var.h>
/* XXX until it's implemented as attach ops */
#include <net80211/ieee80211_scan_sw.h>
#include <net/bpf.h>
struct scan_state {
struct ieee80211_scan_state base; /* public state */
u_int ss_iflags; /* flags used internally */
#define ISCAN_MINDWELL 0x0001 /* min dwell time reached */
#define ISCAN_DISCARD 0x0002 /* discard rx'd frames */
#define ISCAN_CANCEL 0x0004 /* cancel current scan */
#define ISCAN_ABORT 0x0008 /* end the scan immediately */
unsigned long ss_chanmindwell; /* min dwell on curchan */
unsigned long ss_scanend; /* time scan must stop */
u_int ss_duration; /* duration for next scan */
struct task ss_scan_task; /* scan execution */
struct cv ss_scan_cv; /* scan signal */
struct callout ss_scan_timer; /* scan timer */
};
#define SCAN_PRIVATE(ss) ((struct scan_state *) ss)
/*
* Amount of time to go off-channel during a background
* scan. This value should be large enough to catch most
* ap's but short enough that we can return on-channel
* before our listen interval expires.
*
* XXX tunable
* XXX check against configured listen interval
*/
#define IEEE80211_SCAN_OFFCHANNEL msecs_to_ticks(150)
/*
* Roaming-related defaults. RSSI thresholds are as returned by the
* driver (.5dBm). Transmit rate thresholds are IEEE rate codes (i.e
@ -93,55 +68,32 @@ struct scan_state {
#define ROAM_RATE_QUARTER_DEFAULT 2*3 /* quarter-width 11a/g bss */
#define ROAM_MCS_11N_DEFAULT (1 | IEEE80211_RATE_MCS) /* 11n bss */
static void scan_curchan(struct ieee80211_scan_state *, unsigned long);
static void scan_mindwell(struct ieee80211_scan_state *);
static void scan_signal(void *);
static void scan_task(void *, int);
MALLOC_DEFINE(M_80211_SCAN, "80211scan", "802.11 scan state");
void
ieee80211_scan_attach(struct ieee80211com *ic)
{
struct scan_state *ss;
ss = (struct scan_state *) malloc(sizeof(struct scan_state),
M_80211_SCAN, M_NOWAIT | M_ZERO);
if (ss == NULL) {
ic->ic_scan = NULL;
return;
}
callout_init_mtx(&ss->ss_scan_timer, IEEE80211_LOCK_OBJ(ic), 0);
cv_init(&ss->ss_scan_cv, "scan");
TASK_INIT(&ss->ss_scan_task, 0, scan_task, ss);
ic->ic_scan = &ss->base;
ss->base.ss_ic = ic;
ic->ic_scan_curchan = scan_curchan;
ic->ic_scan_mindwell = scan_mindwell;
/*
* For now, the swscan module does both the
* allocation (so it can pad it) and sets up the net80211
* bits.
*
* I'll split this stuff later.
*/
ieee80211_swscan_attach(ic);
}
void
ieee80211_scan_detach(struct ieee80211com *ic)
{
struct ieee80211_scan_state *ss = ic->ic_scan;
if (ss != NULL) {
IEEE80211_LOCK(ic);
SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT;
scan_signal(ss);
IEEE80211_UNLOCK(ic);
ieee80211_draintask(ic, &SCAN_PRIVATE(ss)->ss_scan_task);
callout_drain(&SCAN_PRIVATE(ss)->ss_scan_timer);
KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0,
("scan still running"));
if (ss->ss_ops != NULL) {
ss->ss_ops->scan_detach(ss);
ss->ss_ops = NULL;
}
ic->ic_scan = NULL;
free(SCAN_PRIVATE(ss), M_80211_SCAN);
}
/*
* Ideally we'd do the ss_ops detach call here;
* but then ieee80211_swscan_detach would need
* to be split in two.
*
* I'll do that later.
*/
ieee80211_swscan_detach(ic);
}
static const struct ieee80211_roamparam defroam[IEEE80211_MODE_MAX] = {
@ -176,6 +128,8 @@ ieee80211_scan_vattach(struct ieee80211vap *vap)
vap->iv_roaming = IEEE80211_ROAMING_AUTO;
memcpy(vap->iv_roamparms, defroam, sizeof(defroam));
ieee80211_swscan_vattach(vap);
}
void
@ -186,11 +140,10 @@ ieee80211_scan_vdetach(struct ieee80211vap *vap)
IEEE80211_LOCK(ic);
ss = ic->ic_scan;
ieee80211_swscan_vdetach(vap);
if (ss != NULL && ss->ss_vap == vap) {
if (ic->ic_flags & IEEE80211_F_SCAN) {
SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT;
scan_signal(ss);
}
if (ss->ss_ops != NULL) {
ss->ss_ops->scan_detach(ss);
ss->ss_ops = NULL;
@ -261,8 +214,8 @@ ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan)
* ensure later callbacks find ss_ops set to properly
* reflect current operating mode.
*/
static void
scan_update_locked(struct ieee80211vap *vap,
void
ieee80211_scan_update_locked(struct ieee80211vap *vap,
const struct ieee80211_scanner *scan)
{
struct ieee80211com *ic = vap->iv_ic;
@ -307,6 +260,9 @@ scan_update_locked(struct ieee80211vap *vap,
}
}
/*
* XXX TODO: should be a global method!
*/
static char
channel_type(const struct ieee80211_channel *c)
{
@ -345,8 +301,8 @@ ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss)
}
#ifdef IEEE80211_DEBUG
static void
scan_dump(struct ieee80211_scan_state *ss)
void
ieee80211_scan_dump(struct ieee80211_scan_state *ss)
{
struct ieee80211vap *vap = ss->ss_vap;
@ -357,8 +313,8 @@ scan_dump(struct ieee80211_scan_state *ss)
}
#endif /* IEEE80211_DEBUG */
static void
copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss,
void
ieee80211_scan_copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss,
int nssid, const struct ieee80211_scan_ssid ssids[])
{
if (nssid > IEEE80211_SCAN_MAX_SSID) {
@ -375,8 +331,8 @@ copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss,
/*
* Start a scan unless one is already going.
*/
static int
start_scan_locked(const struct ieee80211_scanner *scan,
int
ieee80211_start_scan_locked(const struct ieee80211_scanner *scan,
struct ieee80211vap *vap, int flags, u_int duration,
u_int mindwell, u_int maxdwell,
u_int nssid, const struct ieee80211_scan_ssid ssids[])
@ -404,10 +360,10 @@ start_scan_locked(const struct ieee80211_scanner *scan,
, flags & IEEE80211_SCAN_ONCE ? ", once" : ""
);
scan_update_locked(vap, scan);
ieee80211_scan_update_locked(vap, scan);
if (ss->ss_ops != NULL) {
if ((flags & IEEE80211_SCAN_NOSSID) == 0)
copy_ssid(vap, ss, nssid, ssids);
ieee80211_scan_copy_ssid(vap, ss, nssid, ssids);
/* NB: top 4 bits for internal use */
ss->ss_flags = flags & 0xfff;
@ -420,9 +376,9 @@ start_scan_locked(const struct ieee80211_scanner *scan,
if (flags & IEEE80211_SCAN_BGSCAN)
ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN;
/* NB: flush frames rx'd before 1st channel change */
SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD;
SCAN_PRIVATE(ss)->ss_duration = duration;
/* Set duration for this particular scan */
ieee80211_swscan_set_scan_duration(vap, duration);
ss->ss_next = 0;
ss->ss_mindwell = mindwell;
ss->ss_maxdwell = maxdwell;
@ -430,10 +386,12 @@ start_scan_locked(const struct ieee80211_scanner *scan,
ss->ss_ops->scan_start(ss, vap);
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_scan(vap))
scan_dump(ss);
ieee80211_scan_dump(ss);
#endif /* IEEE80211_DEBUG */
ic->ic_flags |= IEEE80211_F_SCAN;
ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task);
/* Start scan task */
ieee80211_swscan_run_scan_task(vap);
}
return 1;
} else {
@ -452,9 +410,7 @@ 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) {
@ -465,12 +421,9 @@ ieee80211_start_scan(struct ieee80211vap *vap, int flags,
return 0;
}
IEEE80211_LOCK(ic);
result = start_scan_locked(scan, vap, flags, duration,
/* XXX ops */
return ieee80211_swscan_start_scan(scan, vap, flags, duration,
mindwell, maxdwell, nssid, ssids);
IEEE80211_UNLOCK(ic);
return result;
}
/*
@ -517,49 +470,19 @@ ieee80211_check_scan(struct ieee80211vap *vap, int flags,
/* 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);
/*
* XXX TODO: separate things out a bit better.
* XXX TODO: ops
*/
ieee80211_scan_update_locked(vap, scan);
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,
result = ieee80211_swscan_check_scan(scan, vap, flags, duration,
mindwell, maxdwell, nssid, ssids);
IEEE80211_UNLOCK(ic);
return result;
return (result);
}
/*
@ -582,10 +505,10 @@ ieee80211_check_scan_current(struct ieee80211vap *vap)
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;
// IEEE80211_UNLOCK_ASSERT(sc);
scan = ieee80211_scanner_get(vap->iv_opmode);
if (scan == NULL) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
@ -595,84 +518,14 @@ ieee80211_bg_scan(struct ieee80211vap *vap, int flags)
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;
SCAN_PRIVATE(ss)->ss_duration = duration;
ss->ss_maxdwell = duration;
ic->ic_flags |= IEEE80211_F_SCAN;
ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN;
ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task);
} 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);
/*
* XXX TODO: pull apart the bgscan logic into whatever
* belongs here and whatever belongs in the software
* scanner.
*
* XXX TODO: ops
*/
return (ieee80211_swscan_bg_scan(scan, vap, flags));
}
/*
@ -681,32 +534,9 @@ ieee80211_bg_scan(struct ieee80211vap *vap, int flags)
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;
/* wake up the scan task */
scan_signal(ss);
} else {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: called; F_SCAN=%d, vap=%s, CANCEL=%d\n",
__func__,
!! (ic->ic_flags & IEEE80211_F_SCAN),
(ss->ss_vap == vap ? "match" : "nomatch"),
!! (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL));
}
IEEE80211_UNLOCK(ic);
/* XXX TODO: ops */
ieee80211_swscan_cancel_scan(vap);
}
/*
@ -715,31 +545,9 @@ ieee80211_cancel_scan(struct ieee80211vap *vap)
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;
/* wake up the scan task */
scan_signal(ss);
} else {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: called; F_SCAN=%d, vap=%s, CANCEL=%d\n",
__func__,
!! (ic->ic_flags & IEEE80211_F_SCAN),
(ss->ss_vap == vap ? "match" : "nomatch"),
!! (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL));
}
IEEE80211_UNLOCK(ic);
/* XXX TODO: ops */
ieee80211_swscan_cancel_anyscan(vap);
}
/*
@ -749,15 +557,9 @@ ieee80211_cancel_anyscan(struct ieee80211vap *vap)
void
ieee80211_scan_next(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_scan_state *ss = ic->ic_scan;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: called\n", __func__);
/* wake up the scan task */
IEEE80211_LOCK(ic);
scan_signal(ss);
IEEE80211_UNLOCK(ic);
/* XXX TODO: ops */
ieee80211_swscan_scan_next(vap);
}
/*
@ -775,7 +577,10 @@ ieee80211_scan_done(struct ieee80211vap *vap)
IEEE80211_LOCK(ic);
ss = ic->ic_scan;
ss->ss_next = ss->ss_last; /* all channels are complete */
scan_signal(ss);
/* XXX TODO: ops */
ieee80211_swscan_scan_done(vap);
IEEE80211_UNLOCK(ic);
}
@ -790,328 +595,14 @@ 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_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: calling; maxdwell=%lu\n",
__func__,
maxdwell);
IEEE80211_LOCK(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_signal, ss);
IEEE80211_UNLOCK(vap->iv_ic);
}
static void
scan_signal(void *arg)
{
struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg;
IEEE80211_LOCK_ASSERT(ss->ss_ic);
cv_signal(&SCAN_PRIVATE(ss)->ss_scan_cv);
}
/*
* Handle mindwell requirements completed; initiate a channel
* change to the next channel asap.
*/
static void
scan_mindwell(struct ieee80211_scan_state *ss)
{
struct ieee80211com *ic = ss->ss_ic;
IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, "%s: called\n", __func__);
IEEE80211_LOCK(ic);
scan_signal(ss);
IEEE80211_UNLOCK(ic);
}
static void
scan_task(void *arg, int pending)
{
#define ISCAN_REP (ISCAN_MINDWELL | ISCAN_DISCARD)
struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg;
struct ieee80211vap *vap = ss->ss_vap;
struct ieee80211com *ic = ss->ss_ic;
struct ieee80211_channel *chan;
unsigned long maxdwell, scanend;
int scandone = 0;
IEEE80211_LOCK(ic);
if (vap == NULL || (ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
(SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)) {
/* Cancelled before we started */
goto done;
}
if (ss->ss_next == ss->ss_last) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: no channels to scan\n", __func__);
scandone = 1;
goto done;
}
if (vap->iv_opmode == IEEE80211_M_STA &&
vap->iv_state == IEEE80211_S_RUN) {
if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) {
/* Enable station power save mode */
vap->iv_sta_ps(vap, 1);
/*
* Use an 1ms delay so the null data frame has a chance
* to go out.
* XXX Should use M_TXCB mechanism to eliminate this.
*/
cv_timedwait(&SCAN_PRIVATE(ss)->ss_scan_cv,
IEEE80211_LOCK_OBJ(ic), hz / 1000);
if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)
goto done;
}
}
scanend = ticks + SCAN_PRIVATE(ss)->ss_duration;
/* XXX scan state can change! Re-validate scan state! */
IEEE80211_UNLOCK(ic);
ic->ic_scan_start(ic); /* notify driver */
IEEE80211_LOCK(ic);
for (;;) {
scandone = (ss->ss_next >= ss->ss_last) ||
(SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: loop start; scandone=%d\n",
__func__,
scandone);
if (scandone || (ss->ss_flags & IEEE80211_SCAN_GOTPICK) ||
(SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) ||
time_after(ticks + ss->ss_mindwell, scanend))
break;
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 %lums max %lums]\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",
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 outselves;
* 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), the
* below condvar is used to sleep for the channels dwell time
* and allows it to be signalled for abort.
*/
ic->ic_scan_curchan(ss, maxdwell);
IEEE80211_LOCK(ic);
/* XXX scan state can change! Re-validate scan state! */
SCAN_PRIVATE(ss)->ss_chanmindwell = ticks + ss->ss_mindwell;
/* clear mindwell lock and initial channel change flush */
SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP;
if ((SCAN_PRIVATE(ss)->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT)))
continue;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: waiting\n", __func__);
/* Wait to be signalled to scan the next channel */
cv_wait(&SCAN_PRIVATE(ss)->ss_scan_cv, IEEE80211_LOCK_OBJ(ic));
}
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: out\n", __func__);
if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)
goto done;
IEEE80211_UNLOCK(ic);
ic->ic_scan_end(ic); /* notify driver */
IEEE80211_LOCK(ic);
/* XXX scan state can change! Re-validate scan state! */
/*
* Since a cancellation may have occured during one of the
* driver calls (whilst unlocked), update scandone.
*/
if (scandone == 0 &&
((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0)) {
/* XXX printf? */
if_printf(vap->iv_ifp,
"%s: OOPS! scan cancelled during driver call (1)!\n",
__func__);
scandone = 1;
}
/*
* 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_setupcurchan(ic, ic->ic_bsschan);
IEEE80211_UNLOCK(ic);
ic->ic_set_channel(ic);
ieee80211_radiotap_chan_change(ic);
IEEE80211_LOCK(ic);
}
/* 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? */
ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task);
IEEE80211_UNLOCK(ic);
return;
}
/* 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);
/*
* Since a cancellation may have occured during one of the
* driver calls (whilst unlocked), update scandone.
*/
if (scandone == 0 &&
((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0)) {
/* XXX printf? */
if_printf(vap->iv_ifp,
"%s: OOPS! scan cancelled during driver call (2)!\n",
__func__);
scandone = 1;
}
/*
* 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.
*/
done:
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) {
vap->iv_sta_ps(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|ISCAN_ABORT);
ss->ss_flags &= ~(IEEE80211_SCAN_ONCE | IEEE80211_SCAN_PICK1ST);
IEEE80211_UNLOCK(ic);
#undef ISCAN_REP
/* XXX TODO: ops */
ieee80211_swscan_probe_curchan(vap, force);
}
#ifdef IEEE80211_DEBUG
@ -1140,8 +631,8 @@ dump_country(const uint8_t *ie)
printf("]");
}
static void
dump_probe_beacon(uint8_t subtype, int isnew,
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)
{
@ -1172,45 +663,8 @@ ieee80211_add_scan(struct ieee80211vap *vap,
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))
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)) {
/*
* 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);
}
}
return (ieee80211_swscan_add_scan(vap, sp, wh, subtype, rssi, noise));
}
/*

14
sys/net80211/ieee80211_scan.h
View File

@ -299,4 +299,18 @@ void ieee80211_scanner_unregister(enum ieee80211_opmode,
const struct ieee80211_scanner *);
void ieee80211_scanner_unregister_all(const struct ieee80211_scanner *);
const struct ieee80211_scanner *ieee80211_scanner_get(enum ieee80211_opmode);
void ieee80211_scan_update_locked(struct ieee80211vap *vap,
const struct ieee80211_scanner *scan);
void ieee80211_scan_copy_ssid(struct ieee80211vap *vap,
struct ieee80211_scan_state *ss,
int nssid, const struct ieee80211_scan_ssid ssids[]);
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);
int ieee80211_start_scan_locked(const struct ieee80211_scanner *scan,
struct ieee80211vap *vap, int flags, u_int duration,
u_int mindwell, u_int maxdwell,
u_int nssid, const struct ieee80211_scan_ssid ssids[]);
void ieee80211_scan_dump(struct ieee80211_scan_state *ss);
#endif /* _NET80211_IEEE80211_SCAN_H_ */

892
sys/net80211/ieee80211_scan_sw.c Normal file
View File

@ -0,0 +1,892 @@
/*-
* Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* IEEE 802.11 scanning support.
*/
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/condvar.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_media.h>
#include <net/ethernet.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_scan_sw.h>
#include <net/bpf.h>
struct scan_state {
struct ieee80211_scan_state base; /* public state */
u_int ss_iflags; /* flags used internally */
#define ISCAN_MINDWELL 0x0001 /* min dwell time reached */
#define ISCAN_DISCARD 0x0002 /* discard rx'd frames */
#define ISCAN_CANCEL 0x0004 /* cancel current scan */
#define ISCAN_ABORT 0x0008 /* end the scan immediately */
unsigned long ss_chanmindwell; /* min dwell on curchan */
unsigned long ss_scanend; /* time scan must stop */
u_int ss_duration; /* duration for next scan */
struct task ss_scan_task; /* scan execution */
struct cv ss_scan_cv; /* scan signal */
struct callout ss_scan_timer; /* scan timer */
};
#define SCAN_PRIVATE(ss) ((struct scan_state *) ss)
/*
* Amount of time to go off-channel during a background
* scan. This value should be large enough to catch most
* ap's but short enough that we can return on-channel
* before our listen interval expires.
*
* XXX tunable
* XXX check against configured listen interval
*/
#define IEEE80211_SCAN_OFFCHANNEL msecs_to_ticks(150)
/*
* Roaming-related defaults. RSSI thresholds are as returned by the
* driver (.5dBm). Transmit rate thresholds are IEEE rate codes (i.e
* .5M units) or MCS.
*/
/* rssi thresholds */
#define ROAM_RSSI_11A_DEFAULT 14 /* 11a bss */
#define ROAM_RSSI_11B_DEFAULT 14 /* 11b bss */
#define ROAM_RSSI_11BONLY_DEFAULT 14 /* 11b-only bss */
/* transmit rate thresholds */
#define ROAM_RATE_11A_DEFAULT 2*12 /* 11a bss */
#define ROAM_RATE_11B_DEFAULT 2*5 /* 11b bss */
#define ROAM_RATE_11BONLY_DEFAULT 2*1 /* 11b-only bss */
#define ROAM_RATE_HALF_DEFAULT 2*6 /* half-width 11a/g bss */
#define ROAM_RATE_QUARTER_DEFAULT 2*3 /* quarter-width 11a/g bss */
#define ROAM_MCS_11N_DEFAULT (1 | IEEE80211_RATE_MCS) /* 11n bss */
static void scan_curchan(struct ieee80211_scan_state *, unsigned long);
static void scan_mindwell(struct ieee80211_scan_state *);
static void scan_signal(void *);
static void scan_task(void *, int);
MALLOC_DEFINE(M_80211_SCAN, "80211scan", "802.11 scan state");
void
ieee80211_swscan_attach(struct ieee80211com *ic)
{
struct scan_state *ss;
ss = (struct scan_state *) malloc(sizeof(struct scan_state),
M_80211_SCAN, M_NOWAIT | M_ZERO);
if (ss == NULL) {
ic->ic_scan = NULL;
return;
}
callout_init_mtx(&ss->ss_scan_timer, IEEE80211_LOCK_OBJ(ic), 0);
cv_init(&ss->ss_scan_cv, "scan");
TASK_INIT(&ss->ss_scan_task, 0, scan_task, ss);
ic->ic_scan = &ss->base;
ss->base.ss_ic = ic;
ic->ic_scan_curchan = scan_curchan;
ic->ic_scan_mindwell = scan_mindwell;
/*
* TODO: all of the non-vap scan calls should be methods!
*/
}
void
ieee80211_swscan_detach(struct ieee80211com *ic)
{
struct ieee80211_scan_state *ss = ic->ic_scan;
if (ss != NULL) {
IEEE80211_LOCK(ic);
SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT;
scan_signal(ss);
IEEE80211_UNLOCK(ic);
ieee80211_draintask(ic, &SCAN_PRIVATE(ss)->ss_scan_task);
callout_drain(&SCAN_PRIVATE(ss)->ss_scan_timer);
KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0,
("scan still running"));
/*
* For now, do the ss_ops detach here rather
* than ieee80211_scan_detach().
*
* I'll figure out how to cleanly split things up
* at a later date.
*/
if (ss->ss_ops != NULL) {
ss->ss_ops->scan_detach(ss);
ss->ss_ops = NULL;
}
ic->ic_scan = NULL;
free(SCAN_PRIVATE(ss), M_80211_SCAN);
}
}
void
ieee80211_swscan_vattach(struct ieee80211vap *vap)
{
/* nothing to do for now */
/*
* TODO: all of the vap scan calls should be methods!
*/
}
void
ieee80211_swscan_vdetach(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_scan_state *ss;
IEEE80211_LOCK_ASSERT(ic);
ss = ic->ic_scan;
if (ss != NULL && ss->ss_vap == vap) {
if (ic->ic_flags & IEEE80211_F_SCAN) {
SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT;
scan_signal(ss);
}
}
}
/* XXX should be a global net80211 function */
static char
channel_type(const struct ieee80211_channel *c)
{
if (IEEE80211_IS_CHAN_ST(c))
return 'S';
if (IEEE80211_IS_CHAN_108A(c))
return 'T';
if (IEEE80211_IS_CHAN_108G(c))
return 'G';
if (IEEE80211_IS_CHAN_HT(c))
return 'n';
if (IEEE80211_IS_CHAN_A(c))
return 'a';
if (IEEE80211_IS_CHAN_ANYG(c))
return 'g';
if (IEEE80211_IS_CHAN_B(c))
return 'b';
return 'f';
}
void
ieee80211_swscan_set_scan_duration(struct ieee80211vap *vap, u_int duration)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_scan_state *ss = ic->ic_scan;
IEEE80211_LOCK_ASSERT(ic);
/* NB: flush frames rx'd before 1st channel change */
SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD;
SCAN_PRIVATE(ss)->ss_duration = duration;
}
void
ieee80211_swscan_run_scan_task(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_scan_state *ss = ic->ic_scan;
IEEE80211_LOCK_ASSERT(ic);
ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task);
}
/*
* Start a scan unless one is already going.
*
* Called without the comlock held; grab the comlock as appropriate.
*/
int
ieee80211_swscan_start_scan(const struct ieee80211_scanner *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;
int result;
IEEE80211_UNLOCK_ASSERT(ic);
IEEE80211_LOCK(ic);
result = ieee80211_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.
*
* Called with the comlock held.
*
* XXX TODO: split out!
*/
int
ieee80211_swscan_check_scan(const struct ieee80211_scanner *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;
int result;
IEEE80211_LOCK_ASSERT(ic);
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.
*/
ieee80211_scan_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);
return 1;
}
}
}
result = ieee80211_start_scan_locked(scan, vap, flags, duration,
mindwell, maxdwell, nssid, ssids);
return result;
}
/*
* Restart a previous scan. If the previous scan completed
* then we start again using the existing channel list.
*/
int
ieee80211_swscan_bg_scan(const struct ieee80211_scanner *scan,
struct ieee80211vap *vap, int flags)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_scan_state *ss = ic->ic_scan;
/* XXX assert unlocked? */
// IEEE80211_UNLOCK_ASSERT(ic);
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);
ieee80211_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))
ieee80211_scan_dump(ss);
#endif /* IEEE80211_DEBUG */
}
}
ieee80211_swscan_set_scan_duration(vap, duration);
ss->ss_maxdwell = duration;
ic->ic_flags |= IEEE80211_F_SCAN;
ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN;
ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task);
} 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_swscan_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;
/* wake up the scan task */
scan_signal(ss);
} else {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: called; F_SCAN=%d, vap=%s, CANCEL=%d\n",
__func__,
!! (ic->ic_flags & IEEE80211_F_SCAN),
(ss->ss_vap == vap ? "match" : "nomatch"),
!! (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL));
}
IEEE80211_UNLOCK(ic);
}
/*
* Cancel any scan currently going on.
*/
void
ieee80211_swscan_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;
/* wake up the scan task */
scan_signal(ss);
} else {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: called; F_SCAN=%d, vap=%s, CANCEL=%d\n",
__func__,
!! (ic->ic_flags & IEEE80211_F_SCAN),
(ss->ss_vap == vap ? "match" : "nomatch"),
!! (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL));
}
IEEE80211_UNLOCK(ic);
}
/*
* Public access to scan_next for drivers that manage
* scanning themselves (e.g. for firmware-based devices).
*/
void
ieee80211_swscan_scan_next(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_scan_state *ss = ic->ic_scan;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: called\n", __func__);
/* wake up the scan task */
IEEE80211_LOCK(ic);
scan_signal(ss);
IEEE80211_UNLOCK(ic);
}
/*
* Public access to scan_next for drivers that are not able to scan single
* channels (e.g. for firmware-based devices).
*/
void
ieee80211_swscan_scan_done(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_scan_state *ss;
IEEE80211_LOCK_ASSERT(ic);
ss = ic->ic_scan;
scan_signal(ss);
}
/*
* 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_swscan_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;
/*
* 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_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: calling; maxdwell=%lu\n",
__func__,
maxdwell);
IEEE80211_LOCK(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_signal, ss);
IEEE80211_UNLOCK(vap->iv_ic);
}
static void
scan_signal(void *arg)
{
struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg;
IEEE80211_LOCK_ASSERT(ss->ss_ic);
cv_signal(&SCAN_PRIVATE(ss)->ss_scan_cv);
}
/*
* Handle mindwell requirements completed; initiate a channel
* change to the next channel asap.
*/
static void
scan_mindwell(struct ieee80211_scan_state *ss)
{
struct ieee80211com *ic = ss->ss_ic;
IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, "%s: called\n", __func__);
IEEE80211_LOCK(ic);
scan_signal(ss);
IEEE80211_UNLOCK(ic);
}
static void
scan_task(void *arg, int pending)
{
#define ISCAN_REP (ISCAN_MINDWELL | ISCAN_DISCARD)
struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg;
struct ieee80211vap *vap = ss->ss_vap;
struct ieee80211com *ic = ss->ss_ic;
struct ieee80211_channel *chan;
unsigned long maxdwell, scanend;
int scandone = 0;
IEEE80211_LOCK(ic);
if (vap == NULL || (ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
(SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)) {
/* Cancelled before we started */
goto done;
}
if (ss->ss_next == ss->ss_last) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: no channels to scan\n", __func__);
scandone = 1;
goto done;
}
if (vap->iv_opmode == IEEE80211_M_STA &&
vap->iv_state == IEEE80211_S_RUN) {
if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) {
/* Enable station power save mode */
vap->iv_sta_ps(vap, 1);
/*
* Use an 1ms delay so the null data frame has a chance
* to go out.
* XXX Should use M_TXCB mechanism to eliminate this.
*/
cv_timedwait(&SCAN_PRIVATE(ss)->ss_scan_cv,
IEEE80211_LOCK_OBJ(ic), hz / 1000);
if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)
goto done;
}
}
scanend = ticks + SCAN_PRIVATE(ss)->ss_duration;
/* XXX scan state can change! Re-validate scan state! */
IEEE80211_UNLOCK(ic);
ic->ic_scan_start(ic); /* notify driver */
IEEE80211_LOCK(ic);
for (;;) {
scandone = (ss->ss_next >= ss->ss_last) ||
(SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: loop start; scandone=%d\n",
__func__,
scandone);
if (scandone || (ss->ss_flags & IEEE80211_SCAN_GOTPICK) ||
(SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) ||
time_after(ticks + ss->ss_mindwell, scanend))
break;
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 %lums max %lums]\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",
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 outselves;
* 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), the
* below condvar is used to sleep for the channels dwell time
* and allows it to be signalled for abort.
*/
ic->ic_scan_curchan(ss, maxdwell);
IEEE80211_LOCK(ic);
/* XXX scan state can change! Re-validate scan state! */
SCAN_PRIVATE(ss)->ss_chanmindwell = ticks + ss->ss_mindwell;
/* clear mindwell lock and initial channel change flush */
SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP;
if ((SCAN_PRIVATE(ss)->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT)))
continue;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: waiting\n", __func__);
/* Wait to be signalled to scan the next channel */
cv_wait(&SCAN_PRIVATE(ss)->ss_scan_cv, IEEE80211_LOCK_OBJ(ic));
}
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: out\n", __func__);
if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)
goto done;
IEEE80211_UNLOCK(ic);
ic->ic_scan_end(ic); /* notify driver */
IEEE80211_LOCK(ic);
/* XXX scan state can change! Re-validate scan state! */
/*
* Since a cancellation may have occured during one of the
* driver calls (whilst unlocked), update scandone.
*/
if (scandone == 0 &&
((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0)) {
/* XXX printf? */
if_printf(vap->iv_ifp,
"%s: OOPS! scan cancelled during driver call (1)!\n",
__func__);
scandone = 1;
}
/*
* 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_setupcurchan(ic, ic->ic_bsschan);
IEEE80211_UNLOCK(ic);
ic->ic_set_channel(ic);
ieee80211_radiotap_chan_change(ic);
IEEE80211_LOCK(ic);
}
/* 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? */
ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task);
IEEE80211_UNLOCK(ic);
return;
}
/* 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);
/*
* Since a cancellation may have occured during one of the
* driver calls (whilst unlocked), update scandone.
*/
if (scandone == 0 &&
((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0)) {
/* XXX printf? */
if_printf(vap->iv_ifp,
"%s: OOPS! scan cancelled during driver call (2)!\n",
__func__);
scandone = 1;
}
/*
* 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.
*/
done:
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) {
vap->iv_sta_ps(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|ISCAN_ABORT);
ss->ss_flags &= ~(IEEE80211_SCAN_ONCE | IEEE80211_SCAN_PICK1ST);
IEEE80211_UNLOCK(ic);
#undef ISCAN_REP
}
/*
* Process a beacon or probe response frame.
*/
void
ieee80211_swscan_add_scan(struct ieee80211vap *vap,
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, 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 &&
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);
}
}
}

60
sys/net80211/ieee80211_scan_sw.h Normal file
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@ -0,0 +1,60 @@
/*-
* Copyright (c) 2015 Adrian Chadd <adrian@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef __NET80211_IEEE80211_SCAN_SW_H__
#define __NET80211_IEEE80211_SCAN_SW_H__
extern void ieee80211_swscan_attach(struct ieee80211com *ic);
extern void ieee80211_swscan_detach(struct ieee80211com *ic);
extern void ieee80211_swscan_vattach(struct ieee80211vap *vap);
extern void ieee80211_swscan_vdetach(struct ieee80211vap *vap);
extern int ieee80211_swscan_start_scan(const struct ieee80211_scanner *scan,
struct ieee80211vap *vap, int flags,
u_int duration, u_int mindwell, u_int maxdwell,
u_int nssid, const struct ieee80211_scan_ssid ssids[]);
extern void ieee80211_swscan_set_scan_duration(struct ieee80211vap *vap,
u_int duration);
extern void ieee80211_swscan_run_scan_task(struct ieee80211vap *vap);
extern int ieee80211_swscan_check_scan(const struct ieee80211_scanner *scan,
struct ieee80211vap *vap, int flags,
u_int duration, u_int mindwell, u_int maxdwell,
u_int nssid, const struct ieee80211_scan_ssid ssids[]);
extern int ieee80211_swscan_bg_scan(const struct ieee80211_scanner *scan,
struct ieee80211vap *vap, int flags);
extern void ieee80211_swscan_cancel_scan(struct ieee80211vap *vap);
extern void ieee80211_swscan_cancel_anyscan(struct ieee80211vap *vap);
extern void ieee80211_swscan_scan_next(struct ieee80211vap *vap);
extern void ieee80211_swscan_scan_done(struct ieee80211vap *vap);
extern void ieee80211_swscan_probe_curchan(struct ieee80211vap *vap,
int force);
extern void ieee80211_swscan_add_scan(struct ieee80211vap *vap,
const struct ieee80211_scanparams *sp,
const struct ieee80211_frame *wh,
int subtype, int rssi, int noise);
#endif /* __NET80211_IEEE80211_SCAN_SW_H__ */