Google Git
Sign in
gfiber / kernel / quantenna / 68915b8dc9bf1e5becf2c7a70b9c712401b60692 / . / drivers / qtn / wlan / ieee80211_scan_sta.c
blob: c7e105464d683dd80813f66439537b8b51e73f2e [file] [log] [blame]
//swdepot/dev/ums/soc/main2/drivers/wlan/ieee80211_scan_sta.c#7 - edit change 3043 (text)
/*-
* Copyright (c) 2002-2005 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* 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.
*
* $Id: ieee80211_scan_sta.c 2749 2007-10-16 08:58:14Z kelmo $
*/
#ifndef EXPORT_SYMTAB
#define EXPORT_SYMTAB
#endif
/*
* IEEE 802.11 station scanning support.
*/
#ifndef AUTOCONF_INCLUDED
#include <linux/config.h>
#endif
#include <linux/version.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/delay.h>
#include "net80211/if_media.h"
#include "net80211/ieee80211_var.h"
#define RSNIE_GROUP_CIPHER_OFFSET 0x7
static void sta_flush_table(struct sta_table *);
static int match_bss(struct ieee80211vap *, const struct ieee80211_scan_state *,
const struct sta_entry *);
static int match_ssid(const uint8_t *ie, int nssid,
const struct ieee80211_scan_ssid ssids[]);
static void action_tasklet(IEEE80211_TQUEUE_ARG);
static int
lock_sta_table(struct sta_table *st)
{
// Call can come in SoftIRQ (timer or tasklet) or process context.
// For optimization let's disable SoftIRQ only when call comes in process context.
int bh_disabled = !in_softirq() && !irqs_disabled();
// We must be not called within hardware interrupt context.
WARN_ON_ONCE(in_irq());
spin_lock(&st->st_lock);
if(bh_disabled) {
local_bh_disable();
}
return bh_disabled;
}
static void
unlock_sta_table(struct sta_table *st, int bh_disabled)
{
if(bh_disabled) {
local_bh_enable();
}
spin_unlock(&st->st_lock);
}
static int
sta_lock(struct ieee80211_scan_state *ss)
{
struct sta_table *st = ss->ss_priv;
return lock_sta_table(st);
}
static void sta_unlock(struct ieee80211_scan_state *ss, int bh_disabled)
{
struct sta_table *st = ss->ss_priv;
unlock_sta_table(st, bh_disabled);
}
/*
* Attach prior to any scanning work.
*/
static int
sta_attach(struct ieee80211_scan_state *ss)
{
struct sta_table *st;
_MOD_INC_USE(THIS_MODULE, return 0);
MALLOC(st, struct sta_table *, sizeof(struct sta_table),
M_80211_SCAN, M_NOWAIT | M_ZERO);
if (st == NULL)
return 0;
spin_lock_init(&st->st_lock);
spin_lock_init(&st->st_scanlock);
TAILQ_INIT(&st->st_entry);
IEEE80211_INIT_TQUEUE(&st->st_actiontq, action_tasklet, ss);
ss->ss_priv = st;
return 1;
}
/**
* Clean up the scan entry structure, including freeing dynamic memory that may be used
* to contain received IEs.
*/
static void
cleanup_se(struct sta_entry *se)
{
struct ieee80211_scan_entry *ise = &se->base;
if (ise->se_wpa_ie)
{
FREE(ise->se_wpa_ie, M_DEVBUF);
ise->se_wpa_ie = NULL;
}
if (ise->se_rsn_ie)
{
FREE(ise->se_rsn_ie, M_DEVBUF);
ise->se_rsn_ie = NULL;
}
if (ise->se_wme_ie)
{
FREE(ise->se_wme_ie, M_DEVBUF);
ise->se_wme_ie = NULL;
}
if (ise->se_wsc_ie)
{
FREE(ise->se_wsc_ie, M_DEVBUF);
ise->se_wsc_ie = NULL;
}
if (ise->se_htcap_ie)
{
FREE(ise->se_htcap_ie, M_DEVBUF);
ise->se_htcap_ie = NULL;
}
if (ise->se_htinfo_ie)
{
FREE(ise->se_htinfo_ie, M_DEVBUF);
ise->se_htinfo_ie = NULL;
}
if (ise->se_vhtcap_ie)
{
FREE(ise->se_vhtcap_ie, M_DEVBUF);
ise->se_vhtcap_ie = NULL;
}
if (ise->se_vhtop_ie)
{
FREE(ise->se_vhtop_ie, M_DEVBUF);
ise->se_vhtop_ie = NULL;
}
if (ise->se_ath_ie)
{
FREE(ise->se_ath_ie, M_DEVBUF);
ise->se_ath_ie = NULL;
}
if (ise->se_qtn_ie)
{
FREE(ise->se_qtn_ie, M_DEVBUF);
ise->se_qtn_ie = NULL;
}
if (ise->se_ext_bssid_ie)
{
FREE(ise->se_ext_bssid_ie, M_DEVBUF);
ise->se_ext_bssid_ie = NULL;
}
}
/**
* Free scan entry structure.
*/
static void
free_se(struct sta_entry *se)
{
cleanup_se(se);
FREE(se, M_80211_SCAN);
}
/**
* Free scan entry structure or put request if it is in use.
* Function must be called with keeping table locked (lock_sta_table(st)/unlock_sta_table(st)).
*/
static void
free_se_request(struct sta_entry *se)
{
if(se->se_inuse) {
se->se_request_to_free = 1;
} else {
free_se(se);
}
}
/**
* Free scan entry function if it is not used and there is request to free it.
* Function must be called with keeping table locked (lock_sta_table(st)/unlock_sta_table(st)).
*/
static void
free_se_process(struct sta_entry *se)
{
if(!se->se_inuse && se->se_request_to_free) {
free_se(se);
}
}
/**
* Set in-use flag.
* Function must be called with keeping table locked (lock_sta_table(st)/unlock_sta_table(st)).
*/
static void
set_se_inuse(struct sta_entry *se)
{
se->se_inuse = 1;
}
/**
* Reset in-use flag. 'se' entry can be destroyed.
* Function must be called with keeping table locked (lock_sta_table(st)/unlock_sta_table(st)).
*/
static void
reset_se_inuse(struct sta_entry *se)
{
se->se_inuse = 0;
free_se_process(se);
}
/*
* Cleanup any private state.
*/
static int
sta_detach(struct ieee80211_scan_state *ss)
{
struct sta_table *st = ss->ss_priv;
if (st != NULL) {
IEEE80211_CANCEL_TQUEUE(&st->st_actiontq);
sta_flush_table(st);
FREE(st, M_80211_SCAN);
}
_MOD_DEC_USE(THIS_MODULE);
return 1;
}
/*
* Flush all per-scan state.
*/
static int
sta_flush(struct ieee80211_scan_state *ss)
{
struct sta_table *st = ss->ss_priv;
int bh_disabled;
bh_disabled = lock_sta_table(st);
sta_flush_table(st);
unlock_sta_table(st, bh_disabled);
ss->ss_last = 0;
return 0;
}
/*
* Flush all entries in the scan cache.
*/
static void
sta_flush_table(struct sta_table *st)
{
struct sta_entry *se, *next;
TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) {
TAILQ_REMOVE(&st->st_entry, se, se_list);
LIST_REMOVE(se, se_hash);
free_se_request(se);
if (st->st_entry_num > 0)
st->st_entry_num--;
}
}
/*
* Compare function for sorting scan results.
* Return >0 if @b is considered better.
*/
static int
sta_cmp(struct ieee80211_scan_state *ss,
struct sta_entry *a, struct sta_entry *b)
{
struct ieee80211_scan_entry *ise_a = &a->base;
struct ieee80211_scan_entry *ise_b = &b->base;
/* SSID matched AP preferred */
if (match_ssid(ise_a->se_ssid, ss->ss_nssid, ss->ss_ssid) &&
!match_ssid(ise_b->se_ssid, ss->ss_nssid, ss->ss_ssid))
return -1;
if (!match_ssid(ise_a->se_ssid, ss->ss_nssid, ss->ss_ssid) &&
match_ssid(ise_b->se_ssid, ss->ss_nssid, ss->ss_ssid))
return 1;
/* WPS active AP preferred */
if (ieee80211_wps_active(ise_a->se_wsc_ie) &&
!ieee80211_wps_active(ise_b->se_wsc_ie))
return -1;
if (!ieee80211_wps_active(ise_a->se_wsc_ie) &&
ieee80211_wps_active(ise_b->se_wsc_ie))
return 1;
/* WPA/WPA2 support preferred */
if ((ise_a->se_wpa_ie || ise_a->se_rsn_ie) &&
((!ise_b->se_wpa_ie && !ise_b->se_rsn_ie)))
return -1;
if ((!ise_a->se_wpa_ie && !ise_a->se_rsn_ie) &&
((ise_b->se_wpa_ie || ise_b->se_rsn_ie)))
return 1;
/* Higher RSSI AP preferred */
if (ise_a->se_rssi > ise_b->se_rssi)
return -1;
return 1;
}
/* Caller must lock the st->st_lock */
static void
sta_sort(struct ieee80211_scan_state *ss, struct sta_entry *se)
{
struct sta_table *st = ss->ss_priv;
struct sta_entry *se_tmp, *next;
int found = 0;
TAILQ_FOREACH_SAFE(se_tmp, &st->st_entry, se_list, next) {
if (sta_cmp(ss, se_tmp, se) > 0) {
TAILQ_INSERT_BEFORE(se_tmp, se, se_list);
found = 1;
break;
}
}
if (!found)
TAILQ_INSERT_TAIL(&st->st_entry, se, se_list);
}
/*
* Process a beacon or probe response frame; create an
* entry in the scan cache or update any previous entry.
*/
static int
sta_add(struct ieee80211_scan_state *ss, const struct ieee80211_scanparams *sp,
const struct ieee80211_frame *wh, int subtype, int rssi, int rstamp)
{
#define PICK1ST(_ss) \
((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \
IEEE80211_SCAN_PICK1ST)
struct sta_table *st = ss->ss_priv;
const u_int8_t *macaddr = wh->i_addr2;
struct ieee80211vap *vap = ss->ss_vap;
struct ieee80211com *ic = vap->iv_ic;
struct sta_entry *se;
struct ieee80211_scan_entry *ise;
int hash;
int found = 0;
int bh_disabled;
if (!sp)
return 0;
hash = STA_HASH(macaddr);
bh_disabled = lock_sta_table(st);
LIST_FOREACH(se, &st->st_hash[hash], se_hash)
if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr) &&
sp->ssid[1] == se->base.se_ssid[1] &&
!memcmp(se->base.se_ssid + 2, sp->ssid + 2, se->base.se_ssid[1])) {
TAILQ_REMOVE(&st->st_entry, se, se_list);
found = 1;
break;
}
if (!found) {
if (st->st_entry_num >= ic->ic_scan_tbl_len_max) {
if (printk_ratelimit())
printk("scan found %u scan results but the list is"
" restricted to %u entries\n", st->st_entry_num,
ic->ic_scan_tbl_len_max);
unlock_sta_table(st, bh_disabled);
return 0;
}
MALLOC(se, struct sta_entry *, sizeof(struct sta_entry),
M_80211_SCAN, M_NOWAIT | M_ZERO);
if (se == NULL) {
if (printk_ratelimit())
printk("failed to allocate new scan entry\n");
unlock_sta_table(st, bh_disabled);
return 0;
}
st->st_entry_num++;
se->se_inuse = 0;
se->se_request_to_free = 0;
se->se_scangen = st->st_scangen - 1;
IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr);
LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash);
}
ise = &se->base;
ieee80211_add_scan_entry(ise, sp, wh, subtype, rssi, rstamp);
if (se->se_lastupdate == 0) { /* first sample */
se->se_avgrssi = RSSI_IN(rssi);
} else { /* avg with previous samples */
RSSI_LPF(se->se_avgrssi, rssi);
}
ise->se_rssi = RSSI_GET(se->se_avgrssi);
/* clear failure count after STA_FAIL_AGE passes */
if (se->se_fails && (jiffies - se->se_lastfail) > STA_FAILS_AGE*HZ) {
se->se_fails = 0;
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, macaddr,
"%s: fails %u", __func__, se->se_fails);
}
se->se_lastupdate = jiffies; /* update time */
se->se_seen = 1;
se->se_notseen = 0;
sta_sort(ss, se);
unlock_sta_table(st, bh_disabled);
/*
* If looking for a quick choice and nothing's
* been found check here.
*/
if (PICK1ST(ss) && match_bss(vap, ss, se) == 0)
{
ss->ss_flags |= IEEE80211_SCAN_GOTPICK;
}
return 1;
#undef PICK1ST
}
static struct ieee80211_channel *
find11gchannel(struct ieee80211com *ic, int i, int freq)
{
struct ieee80211_channel *c;
int j;
/*
* The normal ordering in the channel list is b channel
* immediately followed by g so optimize the search for
* this. We'll still do a full search just in case.
*/
for (j = i+1; j < ic->ic_nchans; j++) {
c = &ic->ic_channels[j];
if (c->ic_freq == freq && IEEE80211_IS_CHAN_ANYG(c))
return c;
}
for (j = 0; j < i; j++) {
c = &ic->ic_channels[j];
if (c->ic_freq == freq && IEEE80211_IS_CHAN_ANYG(c))
return c;
}
return NULL;
}
static u_int8_t sschans[IEEE80211_CHAN_BYTES];
static void
add_channels(struct ieee80211com *ic,
struct ieee80211_scan_state *ss,
enum ieee80211_phymode mode, const u_int16_t freq[], int nfreq)
{
struct ieee80211_channel *c, *cg;
u_int modeflags;
int i;
struct ieee80211vap *vap = ss->ss_vap;
modeflags = ieee80211_get_chanflags(mode);
for (i = 0; i < nfreq; i++) {
c = ieee80211_find_channel(ic, freq[i], modeflags);
if (c == NULL || isclr(ic->ic_chan_active_20, c->ic_ieee))
continue;
/* Channel already selected */
if (isset(sschans, c->ic_ieee))
continue;
setbit(sschans, c->ic_ieee);
if (mode == IEEE80211_MODE_AUTO) {
/*
* XXX special-case 11b/g channels so we select
* the g channel if both are present.
*/
if (IEEE80211_IS_CHAN_B(c) &&
(cg = find11gchannel(ic, i, c->ic_freq)) != NULL)
c = cg;
}
if (ss->ss_last >= IEEE80211_SCAN_MAX)
break;
if (ic->ic_flags_ext & IEEE80211_FEXT_SCAN_FAST_REASS &&
ic->ic_fast_reass_chan && (ic->ic_fast_reass_chan != IEEE80211_CHAN_ANYC) &&
(ic->ic_fast_reass_chan->ic_ieee != c->ic_ieee)) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"Skipping channel %u (fast reassoc channel %u)\n",
c->ic_ieee, ic->ic_fast_reass_chan->ic_ieee);
continue;
} else if (ic->ic_flags_ext & IEEE80211_FEXT_SCAN_FAST_REASS &&
ic->ic_fast_reass_chan && (ic->ic_fast_reass_chan != IEEE80211_CHAN_ANYC) &&
(ic->ic_fast_reass_chan->ic_ieee == c->ic_ieee)) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"Adding channel %u (fast reassoc channel %u)\n",
c->ic_ieee, ic->ic_fast_reass_chan->ic_ieee);
}
ss->ss_chans[ss->ss_last++] = c;
}
#undef N
}
static const u_int16_t rcl1[] = /* 8 FCC channel: 36, 40, 44, 48, 52, 56, 60, 64 */
{ 5180, 5200, 5220, 5240, 5260, 5280, 5300, 5320};
static const u_int16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */
{ 5170, 5190, 5210, 5230 };
static const u_int16_t rcl3[] = /* 2.4Ghz ch: 1,2,3,4,5,6,7,8,9,10,11,12,13 */
{ 2412, 2417, 2422, 2427, 2432, 2437, 2442, 2447, 2452, 2457, 2462, 2467, 2472};
static const u_int16_t rcl4[] = /* 5 FCC channel: 149, 153, 157, 161, 165, 169 */
{ 5745, 5765, 5785, 5805, 5825, 5845 };
static const u_int16_t rcl7[] = /* 11 FCC channel: 100,104,108,112,116,120,124,128,132,136,140,144 */
{ 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700, 5720 };
static const u_int16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */
{ 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 };
static const u_int16_t rcl9[] = /* 2.4Ghz ch: 14 */
{ 2484 };
static const u_int16_t rcl10[] = /* Added Korean channels 2312-2372 */
{ 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 };
static const u_int16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */
{ 5040, 5060, 5080, 4920, 4940, 4960, 4980 };
/* Other 5GHz channels : 35, 37, 39, 41, 43, 45, 47,
49, 50, 51, 53, 54, 55, 57, 58, 59, 61, 62, 63, 65, 66 */
static const u_int16_t rcl14[] =
{ 5175, 5185, 5195, 5205, 5215, 5225, 5235,
5245, 5250, 5255, 5265, 5270, 5275, 5285, 5290, 5295, 5305, 5310, 5315, 5325, 5330 };
/* Other 5GHz channels : 98, 99, 101, 102, 103, 105, 106,
107, 109, 110, 111, 113, 114, 115, 117, 118, 119, 121,
122, 123, 125, 126, 127, 129, 130, 131, 133, 134, 135,
137, 138, 139, 141, 142 */
static const u_int16_t rcl15[] =
{ 5490, 5495, 5505, 5510, 5515, 5525, 5530,
5535, 5545, 5550, 5555, 5565, 5570, 5575, 5585, 5590, 5595, 5605,
5610, 5615, 5625, 5630, 5635, 5645, 5650, 5655, 5665, 5670, 5675,
5685, 5690, 5695, 5705, 5710 };
/* Other 5GHz channels : 147, 148, 150, 151, 152, 154, 155,
156, 158, 159, 160, 162, 163, 164, 166, 167 */
static const u_int16_t rcl16[] =
{ 5735, 5740, 5750, 5755, 5760, 5770, 5775,
5780, 5790, 5795, 5800, 5810, 5815, 5820, 5830, 5835 };
/* Other 5GHz channels : 182, 183, 184, 185, 186, 187, 188,
189, 190, 191, 192, 193, 194, 195, 196, 197, 198 */
static const u_int16_t rcl17[] =
{ 4910, 4915, 4920, 4925, 4930, 4935, 4940,
4945, 4950, 4955, 4960, 4965, 4970, 4975, 4980, 4985, 4990 };
/* 5GHz channels - 40 MHz mode:
* 34, 38, 42, 46, 50, 54, 58, 62, 66, 102, 106, 110, 114, 118,
* 122, 126, 130, 134, 138, 142, 151, 155, 159, 163, 167
*/
static const u_int16_t rcl18[] =
{ 5170, 5190, 5210, 5230, 5250, 5270, 5290, 5310, 5330, 5510, 5530, 5550, 5570, 5590,
5610, 5630, 5650, 5670, 5690, 5710, 5755, 5775, 5795, 5815, 5835 };
struct scanlist {
u_int16_t mode;
u_int16_t count;
const u_int16_t *list;
};
#define IEEE80211_MODE_TURBO_STATIC_A IEEE80211_MODE_MAX
#define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a
static const struct scanlist staScanTable[] = {
{ IEEE80211_MODE_11B, X(rcl3) },
{ IEEE80211_MODE_11A, X(rcl1) },
{ IEEE80211_MODE_11A, X(rcl2) },
{ IEEE80211_MODE_11B, X(rcl8) },
{ IEEE80211_MODE_11B, X(rcl9) },
{ IEEE80211_MODE_11A, X(rcl4) },
{ IEEE80211_MODE_11A, X(rcl7) },
{ IEEE80211_MODE_11B, X(rcl10) },
{ IEEE80211_MODE_11A, X(rcl11) },
{ IEEE80211_MODE_11NG, X(rcl3) },
{ IEEE80211_MODE_11NG_HT40PM, X(rcl3) },
{ IEEE80211_MODE_11NA, X(rcl1) },
{ IEEE80211_MODE_11NA, X(rcl7) },
{ IEEE80211_MODE_11NA, X(rcl4) },
{ IEEE80211_MODE_11NA, X(rcl11) },
{ IEEE80211_MODE_11NA, X(rcl2) },
#ifdef QTN_SUPP_ALL_CHAN
{ IEEE80211_MODE_11NA, X(rcl14) },
{ IEEE80211_MODE_11NA, X(rcl15) },
{ IEEE80211_MODE_11NA, X(rcl16) },
{ IEEE80211_MODE_11NA, X(rcl17) },
#endif /* QTN_SUPP_ALL_CHAN */
{ IEEE80211_MODE_11NA_HT40PM, X(rcl1) },
{ IEEE80211_MODE_11NA_HT40PM, X(rcl4) },
{ IEEE80211_MODE_11NA_HT40PM, X(rcl7) },
{ IEEE80211_MODE_11NA_HT40PM, X(rcl11) },
/* { IEEE80211_MODE_11NA_HT40PM, X(rcl2) }, */
#ifdef QTN_SUPP_ALL_CHAN
{ IEEE80211_MODE_11NA_HT40PM, X(rcl14) },
{ IEEE80211_MODE_11NA_HT40PM, X(rcl15) },
{ IEEE80211_MODE_11NA_HT40PM, X(rcl16) },
{ IEEE80211_MODE_11NA_HT40PM, X(rcl17) },
#endif /* QTN_SUPP_ALL_CHAN */
{ IEEE80211_MODE_11AC_VHT20PM, X(rcl1) },
{ IEEE80211_MODE_11AC_VHT20PM, X(rcl4) },
{ IEEE80211_MODE_11AC_VHT20PM, X(rcl7) },
{ IEEE80211_MODE_11AC_VHT20PM, X(rcl11) },
{ IEEE80211_MODE_11AC_VHT40PM, X(rcl1) },
{ IEEE80211_MODE_11AC_VHT40PM, X(rcl4) },
{ IEEE80211_MODE_11AC_VHT40PM, X(rcl7) },
{ IEEE80211_MODE_11AC_VHT40PM, X(rcl11) },
{ IEEE80211_MODE_11AC_VHT80PM, X(rcl1) },
{ IEEE80211_MODE_11AC_VHT80PM, X(rcl4) },
{ IEEE80211_MODE_11AC_VHT80PM, X(rcl7) },
{ IEEE80211_MODE_11AC_VHT80PM, X(rcl11) },
{ .list = NULL }
};
#undef X
/*
* Start a station-mode scan by populating the channel list.
*/
static int
sta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
{
#define N(a) (sizeof(a)/sizeof(a[0]))
struct ieee80211com *ic = vap->iv_ic;
struct sta_table *st = ss->ss_priv;
const struct scanlist *scan;
enum ieee80211_phymode mode;
struct ieee80211_channel *c;
int i;
ss->ss_last = 0;
/* Selected scan channel list */
memset(sschans, 0, sizeof(sschans));
if ((ss->ss_flags & IEEE80211_SCAN_OPCHAN) && vap->iv_state == IEEE80211_S_RUN) {
ss->ss_chans[ss->ss_last++] = ic->ic_curchan;
goto scan_channel_list_ready;
}
#if defined (PLATFORM_QFDR)
/* One of the use case QFDR requires fast scan procedure,
* when channel is known */
if (vap->iv_scan_only_freq && vap->iv_scan_only_cnt) {
c = ieee80211_find_channel(ic, vap->iv_scan_only_freq, 0);
/* check active channels list */
if (c && isset(ic->ic_chan_active, c->ic_ieee)) {
ss->ss_chans[ss->ss_last++] = c;
goto scan_channel_list_ready;
}
}
#endif
/*
* Use the table of ordered channels to construct the list
* of channels for scanning. Any channels in the ordered
* list not in the master list will be discarded.
*/
for (scan = staScanTable; scan->list != NULL; scan++) {
mode = scan->mode;
if ((ic->ic_des_mode != IEEE80211_MODE_AUTO) && (ic->ic_rf_chipid != CHIPID_DUAL)) {
/*
* If a desired mode was specified, scan only
* channels that satisfy that constraint.
*/
if (ic->ic_des_mode != mode) {
/*
* The scan table marks 2.4Ghz channels as b
* so if the desired mode is 11g, then use
* the 11b channel list but upgrade the mode.
*/
if (ic->ic_des_mode != IEEE80211_MODE_11G ||
mode != IEEE80211_MODE_11B)
continue;
mode = IEEE80211_MODE_11G; /* upgrade */
}
} else if ((ss->ss_flags & IEEE80211_SCAN_OBSS) &&
!IS_IEEE80211_MODE_24G_BAND(mode)) {
continue;
} else {
/*
* This lets ieee80211_scan_add_channels
* upgrade an 11b channel to 11g if available.
*/
if (mode == IEEE80211_MODE_11B)
mode = IEEE80211_MODE_AUTO;
}
/*
* Add the list of the channels; any that are not
* in the master channel list will be discarded.
*/
add_channels(ic, ss, mode, scan->list, scan->count);
}
/*
* Add the channels from the ic (from HAL) that are not present
* in the staScanTable.
*/
for (i = 0; i < ic->ic_nchans; i++) {
c = &ic->ic_channels[i];
if (isclr(ic->ic_chan_active_20, c->ic_ieee))
continue;
/* No dfs interference detected channels */
if (c->ic_flags & IEEE80211_CHAN_RADAR)
continue;
/*
* scan dynamic turbo channels in normal mode.
*/
if (IEEE80211_IS_CHAN_DTURBO(c))
continue;
mode = ieee80211_chan2mode(c);
if (ic->ic_des_mode != IEEE80211_MODE_AUTO) {
/*
* If a desired mode was specified, scan only
* channels that satisfy that constraint.
*/
if (ic->ic_des_mode != mode)
continue;
}
/* Is channel already selected? */
if (isset(sschans, c->ic_ieee))
continue;
setbit(sschans, c->ic_ieee);
ss->ss_chans[ss->ss_last++] = c;
}
scan_channel_list_ready:
ss->ss_next = 0;
ss->ss_mindwell = msecs_to_jiffies(ic->ic_mindwell_active);
ss->ss_mindwell_passive = msecs_to_jiffies(ic->ic_mindwell_passive);
ss->ss_maxdwell = msecs_to_jiffies(ic->ic_maxdwell_active);
ss->ss_maxdwell_passive = msecs_to_jiffies(ic->ic_maxdwell_passive);
#if defined (PLATFORM_QFDR)
if (vap->iv_scan_only_freq && vap->iv_scan_only_cnt) {
/* case of QFDR fast scan on specific channel,
* increase DWELL times */
#define QFDR_DWELL_EMPIRICAL_FACTOR 2
ss->ss_mindwell <<= QFDR_DWELL_EMPIRICAL_FACTOR;
ss->ss_mindwell_passive <<= QFDR_DWELL_EMPIRICAL_FACTOR;
ss->ss_maxdwell <<= QFDR_DWELL_EMPIRICAL_FACTOR;
ss->ss_maxdwell_passive <<= QFDR_DWELL_EMPIRICAL_FACTOR;
vap->iv_scan_only_cnt--;
if (vap->iv_scan_only_cnt == 0)
vap->iv_scan_only_freq = 0;
}
#endif
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_scan(vap)) {
printk("%s: scan set ", vap->iv_dev->name);
ieee80211_scan_dump_channels(ss);
printk(" dwell min %ld max %ld\n",
ss->ss_mindwell, ss->ss_maxdwell);
}
#endif /* IEEE80211_DEBUG */
st->st_newscan = 1;
if (ic->ic_flags_ext & IEEE80211_FEXT_SCAN_FAST_REASS &&
ic->ic_fast_reass_chan && (ic->ic_fast_reass_chan != IEEE80211_CHAN_ANYC)) {
if (ieee80211_msg(vap, IEEE80211_MSG_SCAN)) {
int i = 0;
printk("%p Fast reassoc scan (%u)\n",
ic, ic->ic_fast_reass_chan->ic_ieee);
printk("Channel list for scan (should be 1 entry first %u last %u):\n", ss->ss_next, ss->ss_last);
/* NULL terminate the list to print it out. */
ss->ss_chans[ss->ss_last] = NULL;
c = ss->ss_chans[i];
while(c != IEEE80211_CHAN_ANYC && c != NULL) {
printk("channel %u ->", c->ic_ieee);
c = ss->ss_chans[++i];
}
printk("<end>\n");
}
ic->ic_fast_reass_scan_cnt++;
if (ic->ic_fast_reass_scan_cnt > IEEE80211_FAST_REASS_SCAN_MAX) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"Clearing fast scan channel - tried %u times\n", --ic->ic_fast_reass_scan_cnt);
ic->ic_fast_reass_chan = IEEE80211_CHAN_ANYC;
ic->ic_fast_reass_scan_cnt = 0;
}
}
return 0;
#undef N
}
/*
* Restart a bg scan.
*/
static int
sta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
{
struct sta_table *st = ss->ss_priv;
st->st_newscan = 1;
return 0;
}
/*
* Cancel an ongoing scan.
*/
static int
sta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
{
struct sta_table *st = ss->ss_priv;
IEEE80211_CANCEL_TQUEUE(&st->st_actiontq);
return 0;
}
static u_int8_t
maxrate(const struct ieee80211_scan_entry *se)
{
u_int8_t max, r;
int i;
max = 0;
for (i = 0; i < se->se_rates[1]; i++) {
r = se->se_rates[2+i] & IEEE80211_RATE_VAL;
if (r > max)
max = r;
}
for (i = 0; i < se->se_xrates[1]; i++) {
r = se->se_xrates[2+i] & IEEE80211_RATE_VAL;
if (r > max)
max = r;
}
return max;
}
/*
* Compare the capabilities of two entries and decide which is
* more desirable (return >0 if a is considered better). Note
* that we assume compatibility/usability has already been checked
* so we don't need to (e.g. validate whether privacy is supported).
* Used to select the best scan candidate for association in a BSS.
*/
static int
sta_compare(const struct sta_entry *a, const struct sta_entry *b)
{
u_int8_t maxa, maxb;
int weight;
/* privacy support preferred */
if ((a->base.se_capinfo & IEEE80211_CAPINFO_PRIVACY) &&
(b->base.se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
return 1;
if ((a->base.se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0 &&
(b->base.se_capinfo & IEEE80211_CAPINFO_PRIVACY))
return -1;
/* compare count of previous failures */
weight = b->se_fails - a->se_fails;
if (abs(weight) > 1)
return weight;
if (abs(b->base.se_rssi - a->base.se_rssi) < 5) {
/* best/max rate preferred if signal level close enough XXX */
maxa = maxrate(&a->base);
maxb = maxrate(&b->base);
if (maxa != maxb)
return maxa - maxb;
/* XXX use freq for channel preference */
/* for now just prefer 5Ghz band to all other bands */
if (IEEE80211_IS_CHAN_5GHZ(a->base.se_chan) &&
!IEEE80211_IS_CHAN_5GHZ(b->base.se_chan))
return 1;
if (!IEEE80211_IS_CHAN_5GHZ(a->base.se_chan) &&
IEEE80211_IS_CHAN_5GHZ(b->base.se_chan))
return -1;
}
/* all things being equal, use signal level */
return a->base.se_rssi - b->base.se_rssi;
}
/*
* Check MCS suitability and return the best supported rate.
*/
static int
check_basic_mcs(struct ieee80211vap *vap, const struct ieee80211_scan_entry *se)
{
#ifdef RATE_SUPP_ENABLE
struct ieee80211com *ic = vap->iv_ic;
int i, j, okset = 0, okidx = 0, okridx, val = 0;
u_int8_t mcs = 0;
struct ieee80211_ie_htinfo *htinfo = (struct ieee80211_ie_htinfo *)se->htinfo;
/*
* first check for the sets that we support
*/
for (i = 0; i < IEEE80211_HT_MAXMCS_BASICSET_SUPPORTED; i++)
{
mcs = IEEE80211_HTINFO_BASIC_MCS_VALUE(htinfo,i);
mcs = mcs & (ic->ic_htcap.mcsset[i]);
IEEE80211_HT_MCS_IDX(mcs,val);
if (val != 0xFF)
{
okidx = val;
okset = i;
}
}
if !(okidx)
return IEEE80211_HT_BASIC_RATE;
else
okridx = IEEE80211_HT_RATE_TABLE_IDX(okset,okidx)
/*
* now check for the sets that we do not support
*/
for (i = 0; i < IEEE80211_HT_MAXMCS_BASICSET_SUPPORTED; i++)
{
mcs = IEEE80211_HTINFO_BASIC_MCS_VALUE(htinfo,i);
IEEE80211_HT_MCS_IDX(mcs,val)
if (val != 0xFF)
return (IEEE80211_HT_BASIC_RATE | IEEE80211_HT_RATE_TABLE_IDX(i,val-1));
}
return okridx;
#else
return 0;
#endif
}
/*
* Check rate set suitability and return the best supported rate.
*/
static int
check_rate(struct ieee80211vap *vap, const struct ieee80211_scan_entry *se)
{
#define RV(v) ((v) & IEEE80211_RATE_VAL)
struct ieee80211com *ic = vap->iv_ic;
const struct ieee80211_rateset *srs;
int i, j, nrs, r, okrate, badrate, fixedrate;
const u_int8_t *rs;
okrate = badrate = fixedrate = 0;
if (IEEE80211_IS_CHAN_HALF(se->se_chan))
srs = &ic->ic_sup_half_rates;
else if (IEEE80211_IS_CHAN_QUARTER(se->se_chan))
srs = &ic->ic_sup_quarter_rates;
else
srs = &ic->ic_sup_rates[ieee80211_chan2mode(se->se_chan)];
nrs = se->se_rates[1];
rs = se->se_rates + 2;
fixedrate = IEEE80211_FIXED_RATE_NONE;
again:
for (i = 0; i < nrs; i++) {
r = RV(rs[i]);
badrate = r;
/*
* Check any fixed rate is included.
*/
#if 0 /* Not required */
if (r == vap->iv_fixed_rate)
fixedrate = r;
#endif
/*
* Check against our supported rates.
*/
for (j = 0; j < srs->rs_nrates; j++)
if (r == RV(srs->rs_rates[j])) {
if (r > okrate) /* NB: track max */
okrate = r;
break;
}
}
if (rs == se->se_rates+2) {
/* scan xrates too; sort of an algol68-style for loop */
nrs = se->se_xrates[1];
rs = se->se_xrates + 2;
goto again;
}
//if (okrate == 0 || vap->iv_fixed_rate != fixedrate)
if (okrate == 0)
return badrate | IEEE80211_RATE_BASIC;
else
return RV(okrate);
#undef RV
}
static int
match_ssid(const u_int8_t *ie,
int nssid, const struct ieee80211_scan_ssid ssids[])
{
int i;
for (i = 0; i < nssid; i++) {
if (ie[1] == ssids[i].len &&
memcmp(ie + 2, ssids[i].ssid, ie[1]) == 0)
return 1;
}
return 0;
}
/*
* Test a scan candidate for suitability/compatibility.
*/
static int
match_bss(struct ieee80211vap *vap,
const struct ieee80211_scan_state *ss, const struct sta_entry *se0)
{
struct ieee80211com *ic = vap->iv_ic;
const struct ieee80211_scan_entry *se = &se0->base;
u_int8_t rate;
int fail;
u_int8_t ridx;
uint32_t channel;
fail = 0;
channel = ieee80211_chan2ieee(ic, se->se_chan);
channel = (channel > IEEE80211_CHAN_MAX) ? 0 : channel;
if (isclr(ic->ic_chan_active_20, channel))
fail |= 0x01;
if (vap->iv_opmode == IEEE80211_M_IBSS) {
if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
fail |= 0x02;
} else {
if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0)
fail |= 0x02;
}
if (vap->iv_flags & IEEE80211_F_PRIVACY) {
if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
fail |= 0x04;
} else {
/* XXX does this mean privacy is supported or required? */
if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY)
fail |= 0x04;
}
rate = check_rate(vap, se);
if (rate & IEEE80211_RATE_BASIC)
fail |= 0x08;
if ((ss->ss_nssid != 0) &&
!match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid))
fail |= 0x10;
if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
!IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid))
fail |= 0x20;
if (se0->se_fails >= STA_FAILS_MAX)
fail |= 0x40;
if (se0->se_notseen >= STA_PURGE_SCANS)
fail |= 0x80;
ridx = check_basic_mcs(vap, se);
#define IEEE80211_HT_IS_BASIC_MCS(var) var&0x80
if (IEEE80211_HT_IS_BASIC_MCS(ridx))
fail |= 0x100;
/*
* Ignore APs that do not support Bridge Mode if Bridge Mode has not been
* disabled.
* But: dual band RFIC can be used as regular STA connect to 3rd party AP
* so disable the bridge mode checking for RFIC5
*/
if (ic->ic_rf_chipid != CHIPID_DUAL) {
if (!(vap->iv_qtn_flags & IEEE80211_QTN_BRIDGEMODE_DISABLED) &&
!se->se_qtn_ie_flags & IEEE80211_QTN_BRIDGEMODE) {
fail |= 0x200;
}
}
/* allow tkip for non US/FCC regions */
if (!IEEE80211_IS_TKIP_ALLOWED(ic)) {
if ((se->se_rsn_ie != NULL) && ((se->se_rsn_ie)[RSNIE_GROUP_CIPHER_OFFSET] == RSN_CSE_TKIP))
fail |= 0x04;
}
#ifdef IEEE80211_DEBUG
if (ieee80211_msg(vap, IEEE80211_MSG_SCAN | IEEE80211_MSG_ROAM)) {
printf(" %03x", fail);
printf(" %c %s",
fail & 0x40 ? '=' : fail & 0x80 ? '^' : fail ? '-' : '+',
ether_sprintf(se->se_macaddr));
printf(" %s%c", ether_sprintf(se->se_bssid),
fail & 0x20 ? '!' : ' ');
printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan),
fail & 0x01 ? '!' : ' ');
printf(" %+4d", se->se_rssi);
printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2,
fail & 0x08 ? '!' : ' ');
printf(" %4s%c",
(se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" :
(se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "????",
fail & 0x02 ? '!' : ' ');
printf(" %3s%c ",
(se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? "wep" : "no",
fail & 0x04 ? '!' : ' ');
printf(" bm=%u/0x%02x%c ",
(vap->iv_qtn_flags & IEEE80211_QTN_BRIDGEMODE_DISABLED), se->se_qtn_ie_flags,
fail & 0x200 ? '!' : ' ');
printk(" %6s%d","htridx",(ridx & IEEE80211_HT_RATE_TABLE_IDX_MASK));
ieee80211_print_essid(se->se_ssid + 2, se->se_ssid[1]);
printf("%s\n", fail & 0x10 ? "!" : "");
}
#endif
return fail;
}
static void
sta_update_notseen(struct sta_table *st)
{
struct sta_entry *se;
int bh_disabled;
bh_disabled = lock_sta_table(st);
TAILQ_FOREACH(se, &st->st_entry, se_list) {
/*
* If seen then reset and don't bump the count;
* otherwise bump the ``not seen'' count. Note
* that this ensures that stations for which we
* see frames while not scanning but not during
* this scan will not be penalized.
*/
if (se->se_seen)
se->se_seen = 0;
else
se->se_notseen++;
}
unlock_sta_table(st, bh_disabled);
}
static void
sta_dec_fails(struct sta_table *st)
{
struct sta_entry *se;
int bh_disabled;
bh_disabled = lock_sta_table(st);
TAILQ_FOREACH(se, &st->st_entry, se_list)
if (se->se_fails)
se->se_fails--;
unlock_sta_table(st, bh_disabled);
}
static struct sta_entry *
select_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
{
struct sta_table *st = ss->ss_priv;
struct sta_entry *se, *selbs = NULL;
int bh_disabled;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN | IEEE80211_MSG_ROAM, " %s\n",
"macaddr bssid chan rssi rate flag wep essid");
bh_disabled = lock_sta_table(st);
TAILQ_FOREACH(se, &st->st_entry, se_list) {
if (match_bss(vap, ss, se) == 0) {
if (selbs == NULL)
selbs = se;
else if (sta_compare(se, selbs) > 0)
selbs = se;
}
}
unlock_sta_table(st, bh_disabled);
return selbs;
}
/*
* Pick an ap or ibss network to join or find a channel
* to use to start an ibss network.
*/
static int
sta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap,
int (*action)(struct ieee80211vap *, const struct ieee80211_scan_entry *),
u_int32_t flags)
{
struct sta_table *st = ss->ss_priv;
struct sta_entry *selbss;
KASSERT(vap->iv_opmode == IEEE80211_M_STA,
("wrong mode %u", vap->iv_opmode));
if (st->st_newscan) {
sta_update_notseen(st);
st->st_newscan = 0;
}
if (ss->ss_flags & IEEE80211_SCAN_NOPICK) {
/*
* Manual/background scan, don't select+join the
* bss, just return. The scanning framework will
* handle notification that this has completed.
*/
ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
return 1;
}
/*
* Automatic sequencing; look for a candidate and
* if found join the network.
*/
/* NB: unlocked read should be ok */
if (TAILQ_FIRST(&st->st_entry) == NULL) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: no scan candidate\n", __func__);
notfound:
/*
* If nothing suitable was found decrement
* the failure counts so entries will be
* reconsidered the next time around. We
* really want to do this only for sta's
* where we've previously had some success.
*/
sta_dec_fails(st);
st->st_newscan = 1;
return 0; /* restart scan */
}
st->st_action = ss->ss_ops->scan_default;
if (action)
st->st_action = action;
if ((selbss = select_bss(ss, vap)) == NULL ) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: select_bss failed\n", __func__);
goto notfound;
}
st->st_selbss = selbss->base;
/*
* Must defer action to avoid possible recursive call through 80211
* state machine, which would result in recursive locking.
*/
if (!(ss->ss_flags & IEEE80211_SCAN_ONCE)) {
IEEE80211_SCHEDULE_TQUEUE(&st->st_actiontq);
}
return 1; /* terminate scan */
}
/*
* Lookup an entry in the scan cache. We assume we're
* called from the bottom half or such that we don't need
* to block the bottom half so that it's safe to return
* a reference to an entry w/o holding the lock on the table.
*/
static struct sta_entry *
sta_lookup(struct sta_table *st, const u_int8_t macaddr[IEEE80211_ADDR_LEN])
{
struct sta_entry *se;
int hash = STA_HASH(macaddr);
int bh_disabled;
bh_disabled = lock_sta_table(st);
LIST_FOREACH(se, &st->st_hash[hash], se_hash)
if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr))
break;
unlock_sta_table(st, bh_disabled);
return se; /* NB: unlocked */
}
static void
sta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
{
struct ieee80211_node *ni = vap->iv_bss;
struct ieee80211com *ic = vap->iv_ic;
struct sta_table *st = ss->ss_priv;
struct sta_entry *se, *selbs;
u_int8_t roamRate, curRate;
int8_t roamRssi, curRssi;
se = sta_lookup(st, ni->ni_macaddr);
if (se == NULL) {
/* XXX something is wrong */
return;
}
/* XXX do we need 11g too? */
if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan)) {
roamRate = vap->iv_roam.rate11b;
roamRssi = vap->iv_roam.rssi11b;
} else if (IEEE80211_IS_CHAN_B(ic->ic_bsschan)) {
roamRate = vap->iv_roam.rate11bOnly;
roamRssi = vap->iv_roam.rssi11bOnly;
} else {
roamRate = vap->iv_roam.rate11a;
roamRssi = vap->iv_roam.rssi11a;
}
/* NB: the most up to date rssi is in the node, not the scan cache */
curRssi = ic->ic_node_getrssi(ni);
if (vap->iv_fixed_rate == IEEE80211_FIXED_RATE_NONE) {
curRate = ni->ni_rates.rs_rates[ni->ni_txrate] & IEEE80211_RATE_VAL;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM,
"%s: currssi %d currate %u roamrssi %d roamrate %u\n",
__func__, curRssi, curRate, roamRssi, roamRate);
} else {
curRate = roamRate; /* NB: ensure compare below fails */
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM,
"%s: currssi %d roamrssi %d\n",
__func__, curRssi, roamRssi);
}
if (((vap->iv_flags & IEEE80211_F_BGSCAN) || ic->ic_scan_opchan_enable) &&
time_after(jiffies, ic->ic_lastscan + vap->iv_scanvalid)) {
/*
* Scan cache contents is too old; check about updating it.
*/
if (curRate < roamRate || curRssi < roamRssi) {
/*
* Thresholds exceeded, force a scan now so we
* have current state to make a decision with.
*/
ieee80211_bg_scan(vap);
} else if (time_after(jiffies,
ic->ic_lastdata + vap->iv_bgscanidle)) {
/*
* We're not in need of a new ap, but idle;
* kick off a bg scan to replenish the cache.
*/
ieee80211_bg_scan(vap);
}
} else {
/*
* Scan cache contents are warm enough to use;
* check if a new ap should be used and switch.
* XXX deauth current ap
*/
if (curRate < roamRate || curRssi < roamRssi) {
se->base.se_rssi = curRssi;
selbs = select_bss(ss, vap);
if (selbs != NULL && selbs != se)
ieee80211_sta_join(vap, &selbs->base);
}
}
}
/*
* Age entries in the scan cache.
* XXX also do roaming since it's convenient
*/
static void
sta_age(struct ieee80211_scan_state *ss)
{
struct ieee80211vap *vap = ss->ss_vap;
struct sta_table *st = ss->ss_priv;
struct sta_entry *se, *next;
int bh_disabled;
bh_disabled = lock_sta_table(st);
TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) {
if (se->se_notseen >= STA_PURGE_SCANS) {
TAILQ_REMOVE(&st->st_entry, se, se_list);
LIST_REMOVE(se, se_hash);
free_se_request(se);
if (st->st_entry_num > 0)
st->st_entry_num--;
}
}
unlock_sta_table(st, bh_disabled);
/*
* If rate control is enabled check periodically to see if
* we should roam from our current connection to one that
* might be better. This only applies when we're operating
* in sta mode and automatic roaming is set.
* XXX defer if busy
* XXX repeater station
*/
KASSERT(vap->iv_opmode == IEEE80211_M_STA,
("wrong mode %u", vap->iv_opmode));
/* XXX turn this off until the ap release is cut */
if (0 && vap->iv_ic->ic_roaming == IEEE80211_ROAMING_AUTO &&
vap->iv_state >= IEEE80211_S_RUN)
/* XXX vap is implicit */
sta_roam_check(ss, vap);
}
/*
* Remove particular entry from the scan cache,
* if the sta state changes from RUN to any other state
*/
static void
sta_remove(struct ieee80211_scan_state *ss, struct ieee80211_node *ni)
{
struct sta_table *st = ss->ss_priv;
struct sta_entry *se, *next;
int bh_disabled;
bh_disabled = lock_sta_table(st);
TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) {
if (IEEE80211_ADDR_EQ(se->base.se_macaddr, ni->ni_macaddr) &&
!memcmp(se->base.se_ssid + 2, ni->ni_essid, se->base.se_ssid[1])) {
TAILQ_REMOVE(&st->st_entry, se, se_list);
LIST_REMOVE(se, se_hash);
free_se_request(se);
if (st->st_entry_num > 0)
st->st_entry_num--;
}
}
unlock_sta_table(st, bh_disabled);
}
/*
* Iterate over the entries in the scan cache, invoking
* the callback function on each one.
*/
static int
sta_iterate(struct ieee80211_scan_state *ss,
ieee80211_scan_iter_func *f, void *arg)
{
struct sta_table *st = ss->ss_priv;
struct sta_entry *se;
u_int gen;
int res = 0;
int bh_disabled;
spin_lock(&st->st_scanlock);
gen = st->st_scangen++;
restart:
bh_disabled = lock_sta_table(st);
TAILQ_FOREACH(se, &st->st_entry, se_list) {
if (se->se_scangen != gen) {
se->se_scangen = gen;
/* update public state */
se->base.se_age = jiffies - se->se_lastupdate;
/* we are going to use entry after unlocking */
set_se_inuse(se);
unlock_sta_table(st, bh_disabled);
res = (*f)(arg, &se->base);
bh_disabled = lock_sta_table(st);
reset_se_inuse(se);
unlock_sta_table(st, bh_disabled);
if(res != 0) {
/* We probably ran out of buffer space. */
goto done;
}
goto restart;
}
}
unlock_sta_table(st, bh_disabled);
done:
spin_unlock(&st->st_scanlock);
return res;
}
static void
sta_assoc_fail(struct ieee80211_scan_state *ss,
const u_int8_t macaddr[IEEE80211_ADDR_LEN], int reason)
{
struct sta_table *st = ss->ss_priv;
struct sta_entry *se;
se = sta_lookup(st, macaddr);
if (se != NULL) {
se->se_fails++;
se->se_lastfail = jiffies;
IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN,
macaddr, "%s: reason %u fails %u",
__func__, reason, se->se_fails);
}
}
static void
sta_assoc_success(struct ieee80211_scan_state *ss,
const u_int8_t macaddr[IEEE80211_ADDR_LEN])
{
struct sta_table *st = ss->ss_priv;
struct sta_entry *se;
se = sta_lookup(st, macaddr);
if (se != NULL) {
se->se_fails = 0;
IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN,
macaddr, "%s: fails %u", __func__, se->se_fails);
se->se_lastassoc = jiffies;
}
}
static const struct ieee80211_scanner sta_default = {
.scan_name = "default",
.scan_attach = sta_attach,
.scan_detach = sta_detach,
.scan_start = sta_start,
.scan_restart = sta_restart,
.scan_cancel = sta_cancel,
.scan_end = sta_pick_bss,
.scan_flush = sta_flush,
.scan_add = sta_add,
.scan_age = sta_age,
.scan_iterate = sta_iterate,
.scan_assoc_fail = sta_assoc_fail,
.scan_assoc_success = sta_assoc_success,
.scan_lock = sta_lock,
.scan_unlock = sta_unlock,
.scan_default = ieee80211_sta_join,
.scan_remove = sta_remove,
};
/*
* Start an adhoc-mode scan by populating the channel list.
*/
static int
adhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
{
#define N(a) (sizeof(a)/sizeof(a[0]))
struct ieee80211com *ic = vap->iv_ic;
struct sta_table *st = ss->ss_priv;
const struct scanlist *scan;
enum ieee80211_phymode mode;
ss->ss_last = 0;
/*
* Use the table of ordered channels to construct the list
* of channels for scanning. Any channels in the ordered
* list not in the master list will be discarded.
*/
for (scan = staScanTable; scan->list != NULL; scan++) {
mode = scan->mode;
if (ic->ic_des_mode != IEEE80211_MODE_AUTO) {
/*
* If a desired mode was specified, scan only
* channels that satisfy that constraint.
*/
if (ic->ic_des_mode != mode) {
/*
* The scan table marks 2.4Ghz channels as b
* so if the desired mode is 11g, then use
* the 11b channel list but upgrade the mode.
*/
if (ic->ic_des_mode != IEEE80211_MODE_11G ||
mode != IEEE80211_MODE_11B)
continue;
mode = IEEE80211_MODE_11G; /* upgrade */
}
} else {
/*
* This lets ieee80211_scan_add_channels
* upgrade an 11b channel to 11g if available.
*/
if (mode == IEEE80211_MODE_11B)
mode = IEEE80211_MODE_AUTO;
}
/*
* Add the list of the channels; any that are not
* in the master channel list will be discarded.
*/
add_channels(ic, ss, mode, scan->list, scan->count);
}
ss->ss_next = 0;
/* XXX tunables */
ss->ss_mindwell = msecs_to_jiffies(200); /* 200ms */
ss->ss_maxdwell = msecs_to_jiffies(200); /* 200ms */
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_scan(vap)) {
printf("%s: scan set ", vap->iv_dev->name);
ieee80211_scan_dump_channels(ss);
printf(" dwell min %ld max %ld\n",
ss->ss_mindwell, ss->ss_maxdwell);
}
#endif /* IEEE80211_DEBUG */
st->st_newscan = 1;
return 0;
#undef N
}
/*
* Select a channel to start an adhoc network on.
* The channel list was populated with appropriate
* channels so select one that looks least occupied.
* XXX need regulatory domain constraints
*/
static struct ieee80211_channel *
adhoc_pick_channel(struct ieee80211_scan_state *ss)
{
struct sta_table *st = ss->ss_priv;
struct sta_entry *se;
struct ieee80211_channel *c, *bestchan;
int i, bestrssi, maxrssi;
int bh_disabled;
bestchan = NULL;
bestrssi = -1;
bh_disabled = lock_sta_table(st);
for (i = 0; i < ss->ss_last; i++) {
c = ss->ss_chans[i];
maxrssi = 0;
TAILQ_FOREACH(se, &st->st_entry, se_list) {
if (se->base.se_chan != c)
continue;
if (se->base.se_rssi > maxrssi)
maxrssi = se->base.se_rssi;
}
if (bestchan == NULL || maxrssi < bestrssi)
bestchan = c;
}
unlock_sta_table(st, bh_disabled);
return bestchan;
}
/*
* Pick an ibss network to join or find a channel
* to use to start an ibss network.
*/
static int
adhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap,
int (*action)(struct ieee80211vap *, const struct ieee80211_scan_entry *),
u_int32_t flags)
{
struct sta_table *st = ss->ss_priv;
struct sta_entry *selbs;
struct ieee80211_channel *chan;
struct ieee80211com *ic = vap->iv_ic;
KASSERT(vap->iv_opmode == IEEE80211_M_IBSS ||
vap->iv_opmode == IEEE80211_M_AHDEMO,
("wrong opmode %u", vap->iv_opmode));
if (st->st_newscan) {
sta_update_notseen(st);
st->st_newscan = 0;
}
if (ss->ss_flags & IEEE80211_SCAN_NOPICK) {
/*
* Manual/background scan, don't select+join the
* bss, just return. The scanning framework will
* handle notification that this has completed.
*/
ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
return 1;
}
st->st_action = ss->ss_ops->scan_default;
if (action)
st->st_action = action;
/*
* Automatic sequencing; look for a candidate and
* if found join the network.
*/
/* NB: unlocked read should be ok */
if (TAILQ_FIRST(&st->st_entry) == NULL ||
(selbs = select_bss(ss, vap)) == NULL ) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: no scan candidate\n", __func__);
if (vap->iv_des_nssid) {
/*
* No existing adhoc network to join and we have
* an ssid; start one up. If no channel was
* specified, try to select a channel.
*/
if (ic->ic_des_chan == IEEE80211_CHAN_ANYC)
chan = adhoc_pick_channel(ss);
else
chan = ic->ic_des_chan;
if (chan != NULL) {
struct ieee80211_scan_entry se;
memset(&se, 0, sizeof(se));
se.se_chan = chan;
st->st_selbss = se;
/* defer action */
IEEE80211_SCHEDULE_TQUEUE(&st->st_actiontq);
return 1;
}
}
/*
* If nothing suitable was found decrement
* the failure counts so entries will be
* reconsidered the next time around. We
* really want to do this only for sta's
* where we've previously had some success.
*/
sta_dec_fails(st);
st->st_newscan = 1;
return 0; /* restart scan */
}
/*
* Must defer action to avoid possible recursive call through 80211
* state machine, which would result in recursive locking.
*/
st->st_selbss = selbs->base;
IEEE80211_SCHEDULE_TQUEUE(&st->st_actiontq);
return 1; /* terminate scan */
}
/*
* Age entries in the scan cache.
*/
static void
adhoc_age(struct ieee80211_scan_state *ss)
{
struct sta_table *st = ss->ss_priv;
struct sta_entry *se, *next;
int bh_disabled;
bh_disabled = lock_sta_table(st);
TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) {
if (se->se_notseen > STA_PURGE_SCANS) {
TAILQ_REMOVE(&st->st_entry, se, se_list);
LIST_REMOVE(se, se_hash);
free_se_request(se);
if (st->st_entry_num > 0)
st->st_entry_num--;
}
}
unlock_sta_table(st, bh_disabled);
}
/*
* Default action to execute when a scan entry is found for adhoc
* mode. Return 1 on success, 0 on failure
*/
static int
adhoc_default_action(struct ieee80211vap *vap,
const struct ieee80211_scan_entry *se)
{
u_int8_t zeroMacAddr[IEEE80211_ADDR_LEN];
memset(&zeroMacAddr, 0, IEEE80211_ADDR_LEN);
if (IEEE80211_ADDR_EQ(se->se_bssid, &zeroMacAddr[0])) {
ieee80211_create_bss(vap, se->se_chan);
return 1;
} else
return ieee80211_sta_join(vap,se);
}
static const struct ieee80211_scanner adhoc_default = {
.scan_name = "default",
.scan_attach = sta_attach,
.scan_detach = sta_detach,
.scan_start = adhoc_start,
.scan_restart = sta_restart,
.scan_cancel = sta_cancel,
.scan_end = adhoc_pick_bss,
.scan_flush = sta_flush,
.scan_add = sta_add,
.scan_age = adhoc_age,
.scan_iterate = sta_iterate,
.scan_assoc_fail = sta_assoc_fail,
.scan_assoc_success = sta_assoc_success,
.scan_lock = sta_lock,
.scan_unlock = sta_unlock,
.scan_default = adhoc_default_action,
};
static void
action_tasklet(IEEE80211_TQUEUE_ARG data)
{
struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *)data;
struct sta_table *st = (struct sta_table *)ss->ss_priv;
struct ieee80211vap *vap = ss->ss_vap;
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_channel *chan;
switch (vap->iv_opmode) {
case IEEE80211_M_STA:
sta_dec_fails(st);
st->st_newscan = 1;
break;
default:
/* ADHOC */
if (vap->iv_des_nssid) {
/*
* No existing adhoc network to join and we have
* an ssid; start one up. If no channel was
* specified, try to select a channel.
*/
if (ic->ic_des_chan == IEEE80211_CHAN_ANYC)
chan = adhoc_pick_channel(ss);
else
chan = ic->ic_des_chan;
if (chan != NULL) {
struct ieee80211_scan_entry se;
memset(&se, 0, sizeof(se));
se.se_chan = chan;
if ((*ss->ss_ops->scan_default)(vap, &se))
return;
}
}
/*
* If nothing suitable was found decrement
* the failure counts so entries will be
* reconsidered the next time around. We
* really want to do this only for sta's
* where we've previously had some success.
*/
sta_dec_fails(st);
st->st_newscan = 1;
break;
}
/*
* restart scan
*/
/* no ap, clear the flag for a new scan */
vap->iv_ic->ic_flags &= ~IEEE80211_F_SCAN;
if ((ss->ss_flags & IEEE80211_SCAN_USECACHE) == 0)
(void) ieee80211_start_scan(vap, ss->ss_flags, ss->ss_duration, ss->ss_nssid, ss->ss_ssid);
}
/*
* Module glue.
*/
MODULE_AUTHOR("Errno Consulting, Sam Leffler");
MODULE_DESCRIPTION("802.11 wireless support: default station scanner");
#ifdef MODULE_LICENSE
MODULE_LICENSE("Dual BSD/GPL");
#endif
static int __init
init_scanner_sta(void)
{
ieee80211_scanner_register(IEEE80211_M_STA, &sta_default);
ieee80211_scanner_register(IEEE80211_M_IBSS, &adhoc_default);
ieee80211_scanner_register(IEEE80211_M_AHDEMO, &adhoc_default);
return 0;
}
module_init(init_scanner_sta);
static void __exit
exit_scanner_sta(void)
{
ieee80211_scanner_unregister_all(&sta_default);
ieee80211_scanner_unregister_all(&adhoc_default);
}
module_exit(exit_scanner_sta);