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android / kernel / x86_64 / refs/tags/android-8.0.0_r0.6 / . / net / mac80211 / mlme.c
blob: 5b4328dcbe4ecb443ae26f31b186bc389c51dd0e [file] [log] [blame]
/*
* BSS client mode implementation
* Copyright 2003-2008, Jouni Malinen <j@w1.fi>
* Copyright 2004, Instant802 Networks, Inc.
* Copyright 2005, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/delay.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/moduleparam.h>
#include <linux/rtnetlink.h>
#include <linux/pm_qos.h>
#include <linux/crc32.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
#include "rate.h"
#include "led.h"
#define IEEE80211_AUTH_TIMEOUT (HZ / 5)
#define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2)
#define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10)
#define IEEE80211_AUTH_MAX_TRIES 3
#define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
#define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
#define IEEE80211_ASSOC_TIMEOUT_LONG (HZ / 2)
#define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10)
#define IEEE80211_ASSOC_MAX_TRIES 3
static int max_nullfunc_tries = 2;
module_param(max_nullfunc_tries, int, 0644);
MODULE_PARM_DESC(max_nullfunc_tries,
"Maximum nullfunc tx tries before disconnecting (reason 4).");
static int max_probe_tries = 5;
module_param(max_probe_tries, int, 0644);
MODULE_PARM_DESC(max_probe_tries,
"Maximum probe tries before disconnecting (reason 4).");
/*
* Beacon loss timeout is calculated as N frames times the
* advertised beacon interval. This may need to be somewhat
* higher than what hardware might detect to account for
* delays in the host processing frames. But since we also
* probe on beacon miss before declaring the connection lost
* default to what we want.
*/
static int beacon_loss_count = 7;
module_param(beacon_loss_count, int, 0644);
MODULE_PARM_DESC(beacon_loss_count,
"Number of beacon intervals before we decide beacon was lost.");
/*
* Time the connection can be idle before we probe
* it to see if we can still talk to the AP.
*/
#define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
/*
* Time we wait for a probe response after sending
* a probe request because of beacon loss or for
* checking the connection still works.
*/
static int probe_wait_ms = 500;
module_param(probe_wait_ms, int, 0644);
MODULE_PARM_DESC(probe_wait_ms,
"Maximum time(ms) to wait for probe response"
" before disconnecting (reason 4).");
/*
* Weight given to the latest Beacon frame when calculating average signal
* strength for Beacon frames received in the current BSS. This must be
* between 1 and 15.
*/
#define IEEE80211_SIGNAL_AVE_WEIGHT 3
/*
* How many Beacon frames need to have been used in average signal strength
* before starting to indicate signal change events.
*/
#define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
/*
* All cfg80211 functions have to be called outside a locked
* section so that they can acquire a lock themselves... This
* is much simpler than queuing up things in cfg80211, but we
* do need some indirection for that here.
*/
enum rx_mgmt_action {
/* no action required */
RX_MGMT_NONE,
/* caller must call cfg80211_send_deauth() */
RX_MGMT_CFG80211_DEAUTH,
/* caller must call cfg80211_send_disassoc() */
RX_MGMT_CFG80211_DISASSOC,
/* caller must call cfg80211_send_rx_auth() */
RX_MGMT_CFG80211_RX_AUTH,
/* caller must call cfg80211_send_rx_assoc() */
RX_MGMT_CFG80211_RX_ASSOC,
/* caller must call cfg80211_send_assoc_timeout() */
RX_MGMT_CFG80211_ASSOC_TIMEOUT,
/* used when a processed beacon causes a deauth */
RX_MGMT_CFG80211_TX_DEAUTH,
};
/* utils */
static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
{
lockdep_assert_held(&ifmgd->mtx);
}
/*
* We can have multiple work items (and connection probing)
* scheduling this timer, but we need to take care to only
* reschedule it when it should fire _earlier_ than it was
* asked for before, or if it's not pending right now. This
* function ensures that. Note that it then is required to
* run this function for all timeouts after the first one
* has happened -- the work that runs from this timer will
* do that.
*/
static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
{
ASSERT_MGD_MTX(ifmgd);
if (!timer_pending(&ifmgd->timer) ||
time_before(timeout, ifmgd->timer.expires))
mod_timer(&ifmgd->timer, timeout);
}
void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
{
if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
return;
if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
return;
mod_timer(&sdata->u.mgd.bcn_mon_timer,
round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
}
void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
if (unlikely(!sdata->u.mgd.associated))
return;
if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
return;
mod_timer(&sdata->u.mgd.conn_mon_timer,
round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
ifmgd->probe_send_count = 0;
}
static int ecw2cw(int ecw)
{
return (1 << ecw) - 1;
}
static u32 chandef_downgrade(struct cfg80211_chan_def *c)
{
u32 ret;
int tmp;
switch (c->width) {
case NL80211_CHAN_WIDTH_20:
c->width = NL80211_CHAN_WIDTH_20_NOHT;
ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
break;
case NL80211_CHAN_WIDTH_40:
c->width = NL80211_CHAN_WIDTH_20;
c->center_freq1 = c->chan->center_freq;
ret = IEEE80211_STA_DISABLE_40MHZ |
IEEE80211_STA_DISABLE_VHT;
break;
case NL80211_CHAN_WIDTH_80:
tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
/* n_P40 */
tmp /= 2;
/* freq_P40 */
c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
c->width = NL80211_CHAN_WIDTH_40;
ret = IEEE80211_STA_DISABLE_VHT;
break;
case NL80211_CHAN_WIDTH_80P80:
c->center_freq2 = 0;
c->width = NL80211_CHAN_WIDTH_80;
ret = IEEE80211_STA_DISABLE_80P80MHZ |
IEEE80211_STA_DISABLE_160MHZ;
break;
case NL80211_CHAN_WIDTH_160:
/* n_P20 */
tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
/* n_P80 */
tmp /= 4;
c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
c->width = NL80211_CHAN_WIDTH_80;
ret = IEEE80211_STA_DISABLE_80P80MHZ |
IEEE80211_STA_DISABLE_160MHZ;
break;
default:
case NL80211_CHAN_WIDTH_20_NOHT:
WARN_ON_ONCE(1);
c->width = NL80211_CHAN_WIDTH_20_NOHT;
ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
break;
}
WARN_ON_ONCE(!cfg80211_chandef_valid(c));
return ret;
}
static u32
ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
struct ieee80211_supported_band *sband,
struct ieee80211_channel *channel,
const struct ieee80211_ht_operation *ht_oper,
const struct ieee80211_vht_operation *vht_oper,
struct cfg80211_chan_def *chandef, bool tracking)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct cfg80211_chan_def vht_chandef;
u32 ht_cfreq, ret;
chandef->chan = channel;
chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
chandef->center_freq1 = channel->center_freq;
chandef->center_freq2 = 0;
if (!ht_oper || !sband->ht_cap.ht_supported) {
ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
goto out;
}
chandef->width = NL80211_CHAN_WIDTH_20;
ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
channel->band);
/* check that channel matches the right operating channel */
if (!tracking && channel->center_freq != ht_cfreq) {
/*
* It's possible that some APs are confused here;
* Netgear WNDR3700 sometimes reports 4 higher than
* the actual channel in association responses, but
* since we look at probe response/beacon data here
* it should be OK.
*/
sdata_info(sdata,
"Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
channel->center_freq, ht_cfreq,
ht_oper->primary_chan, channel->band);
ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
goto out;
}
/* check 40 MHz support, if we have it */
if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
chandef->width = NL80211_CHAN_WIDTH_40;
chandef->center_freq1 += 10;
break;
case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
chandef->width = NL80211_CHAN_WIDTH_40;
chandef->center_freq1 -= 10;
break;
}
} else {
/* 40 MHz (and 80 MHz) must be supported for VHT */
ret = IEEE80211_STA_DISABLE_VHT;
/* also mark 40 MHz disabled */
ret |= IEEE80211_STA_DISABLE_40MHZ;
goto out;
}
if (!vht_oper || !sband->vht_cap.vht_supported) {
ret = IEEE80211_STA_DISABLE_VHT;
goto out;
}
vht_chandef.chan = channel;
vht_chandef.center_freq1 =
ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
channel->band);
vht_chandef.center_freq2 = 0;
switch (vht_oper->chan_width) {
case IEEE80211_VHT_CHANWIDTH_USE_HT:
vht_chandef.width = chandef->width;
break;
case IEEE80211_VHT_CHANWIDTH_80MHZ:
vht_chandef.width = NL80211_CHAN_WIDTH_80;
break;
case IEEE80211_VHT_CHANWIDTH_160MHZ:
vht_chandef.width = NL80211_CHAN_WIDTH_160;
break;
case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
vht_chandef.center_freq2 =
ieee80211_channel_to_frequency(
vht_oper->center_freq_seg2_idx,
channel->band);
break;
default:
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
sdata_info(sdata,
"AP VHT operation IE has invalid channel width (%d), disable VHT\n",
vht_oper->chan_width);
ret = IEEE80211_STA_DISABLE_VHT;
goto out;
}
if (!cfg80211_chandef_valid(&vht_chandef)) {
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
sdata_info(sdata,
"AP VHT information is invalid, disable VHT\n");
ret = IEEE80211_STA_DISABLE_VHT;
goto out;
}
if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
ret = 0;
goto out;
}
if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
sdata_info(sdata,
"AP VHT information doesn't match HT, disable VHT\n");
ret = IEEE80211_STA_DISABLE_VHT;
goto out;
}
*chandef = vht_chandef;
ret = 0;
out:
/* don't print the message below for VHT mismatch if VHT is disabled */
if (ret & IEEE80211_STA_DISABLE_VHT)
vht_chandef = *chandef;
/*
* Ignore the DISABLED flag when we're already connected and only
* tracking the APs beacon for bandwidth changes - otherwise we
* might get disconnected here if we connect to an AP, update our
* regulatory information based on the AP's country IE and the
* information we have is wrong/outdated and disables the channel
* that we're actually using for the connection to the AP.
*/
while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
tracking ? 0 :
IEEE80211_CHAN_DISABLED)) {
if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
ret = IEEE80211_STA_DISABLE_HT |
IEEE80211_STA_DISABLE_VHT;
break;
}
ret |= chandef_downgrade(chandef);
}
if (chandef->width != vht_chandef.width && !tracking)
sdata_info(sdata,
"capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
return ret;
}
static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta,
const struct ieee80211_ht_operation *ht_oper,
const struct ieee80211_vht_operation *vht_oper,
const u8 *bssid, u32 *changed)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_supported_band *sband;
struct ieee80211_channel *chan;
struct cfg80211_chan_def chandef;
u16 ht_opmode;
u32 flags;
enum ieee80211_sta_rx_bandwidth new_sta_bw;
int ret;
/* if HT was/is disabled, don't track any bandwidth changes */
if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
return 0;
/* don't check VHT if we associated as non-VHT station */
if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
vht_oper = NULL;
if (WARN_ON_ONCE(!sta))
return -EINVAL;
chan = sdata->vif.bss_conf.chandef.chan;
sband = local->hw.wiphy->bands[chan->band];
/* calculate new channel (type) based on HT/VHT operation IEs */
flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper,
vht_oper, &chandef, true);
/*
* Downgrade the new channel if we associated with restricted
* capabilities. For example, if we associated as a 20 MHz STA
* to a 40 MHz AP (due to regulatory, capabilities or config
* reasons) then switching to a 40 MHz channel now won't do us
* any good -- we couldn't use it with the AP.
*/
if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
chandef.width == NL80211_CHAN_WIDTH_80P80)
flags |= chandef_downgrade(&chandef);
if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
chandef.width == NL80211_CHAN_WIDTH_160)
flags |= chandef_downgrade(&chandef);
if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
chandef.width > NL80211_CHAN_WIDTH_20)
flags |= chandef_downgrade(&chandef);
if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
return 0;
sdata_info(sdata,
"AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
ifmgd->bssid, chandef.chan->center_freq, chandef.width,
chandef.center_freq1, chandef.center_freq2);
if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
IEEE80211_STA_DISABLE_VHT |
IEEE80211_STA_DISABLE_40MHZ |
IEEE80211_STA_DISABLE_80P80MHZ |
IEEE80211_STA_DISABLE_160MHZ)) ||
!cfg80211_chandef_valid(&chandef)) {
sdata_info(sdata,
"AP %pM changed bandwidth in a way we can't support - disconnect\n",
ifmgd->bssid);
return -EINVAL;
}
switch (chandef.width) {
case NL80211_CHAN_WIDTH_20_NOHT:
case NL80211_CHAN_WIDTH_20:
new_sta_bw = IEEE80211_STA_RX_BW_20;
break;
case NL80211_CHAN_WIDTH_40:
new_sta_bw = IEEE80211_STA_RX_BW_40;
break;
case NL80211_CHAN_WIDTH_80:
new_sta_bw = IEEE80211_STA_RX_BW_80;
break;
case NL80211_CHAN_WIDTH_80P80:
case NL80211_CHAN_WIDTH_160:
new_sta_bw = IEEE80211_STA_RX_BW_160;
break;
default:
return -EINVAL;
}
if (new_sta_bw > sta->cur_max_bandwidth)
new_sta_bw = sta->cur_max_bandwidth;
if (new_sta_bw < sta->sta.bandwidth) {
sta->sta.bandwidth = new_sta_bw;
rate_control_rate_update(local, sband, sta,
IEEE80211_RC_BW_CHANGED);
}
ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
if (ret) {
sdata_info(sdata,
"AP %pM changed bandwidth to incompatible one - disconnect\n",
ifmgd->bssid);
return ret;
}
if (new_sta_bw > sta->sta.bandwidth) {
sta->sta.bandwidth = new_sta_bw;
rate_control_rate_update(local, sband, sta,
IEEE80211_RC_BW_CHANGED);
}
ht_opmode = le16_to_cpu(ht_oper->operation_mode);
/* if bss configuration changed store the new one */
if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
*changed |= BSS_CHANGED_HT;
sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
}
return 0;
}
/* frame sending functions */
static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
struct ieee80211_supported_band *sband,
u32 *rates)
{
int i, j, count;
*rates = 0;
count = 0;
for (i = 0; i < supp_rates_len; i++) {
int rate = (supp_rates[i] & 0x7F) * 5;
for (j = 0; j < sband->n_bitrates; j++)
if (sband->bitrates[j].bitrate == rate) {
*rates |= BIT(j);
count++;
break;
}
}
return count;
}
static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, u8 ap_ht_param,
struct ieee80211_supported_band *sband,
struct ieee80211_channel *channel,
enum ieee80211_smps_mode smps)
{
u8 *pos;
u32 flags = channel->flags;
u16 cap;
struct ieee80211_sta_ht_cap ht_cap;
BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
ieee80211_apply_htcap_overrides(sdata, &ht_cap);
/* determine capability flags */
cap = ht_cap.cap;
switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
cap &= ~IEEE80211_HT_CAP_SGI_40;
}
break;
case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
cap &= ~IEEE80211_HT_CAP_SGI_40;
}
break;
}
/*
* If 40 MHz was disabled associate as though we weren't
* capable of 40 MHz -- some broken APs will never fall
* back to trying to transmit in 20 MHz.
*/
if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
cap &= ~IEEE80211_HT_CAP_SGI_40;
}
/* set SM PS mode properly */
cap &= ~IEEE80211_HT_CAP_SM_PS;
switch (smps) {
case IEEE80211_SMPS_AUTOMATIC:
case IEEE80211_SMPS_NUM_MODES:
WARN_ON(1);
case IEEE80211_SMPS_OFF:
cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
IEEE80211_HT_CAP_SM_PS_SHIFT;
break;
case IEEE80211_SMPS_STATIC:
cap |= WLAN_HT_CAP_SM_PS_STATIC <<
IEEE80211_HT_CAP_SM_PS_SHIFT;
break;
case IEEE80211_SMPS_DYNAMIC:
cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
IEEE80211_HT_CAP_SM_PS_SHIFT;
break;
}
/* reserve and fill IE */
pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
}
static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb,
struct ieee80211_supported_band *sband,
struct ieee80211_vht_cap *ap_vht_cap)
{
u8 *pos;
u32 cap;
struct ieee80211_sta_vht_cap vht_cap;
BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
/* determine capability flags */
cap = vht_cap.cap;
if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
}
if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
}
/*
* Some APs apparently get confused if our capabilities are better
* than theirs, so restrict what we advertise in the assoc request.
*/
if (!(ap_vht_cap->vht_cap_info &
cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
/* reserve and fill IE */
pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
}
static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
u8 *pos, qos_info;
size_t offset = 0, noffset;
int i, count, rates_len, supp_rates_len;
u16 capab;
struct ieee80211_supported_band *sband;
struct ieee80211_chanctx_conf *chanctx_conf;
struct ieee80211_channel *chan;
u32 rates = 0;
lockdep_assert_held(&ifmgd->mtx);
rcu_read_lock();
chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
if (WARN_ON(!chanctx_conf)) {
rcu_read_unlock();
return;
}
chan = chanctx_conf->def.chan;
rcu_read_unlock();
sband = local->hw.wiphy->bands[chan->band];
if (assoc_data->supp_rates_len) {
/*
* Get all rates supported by the device and the AP as
* some APs don't like getting a superset of their rates
* in the association request (e.g. D-Link DAP 1353 in
* b-only mode)...
*/
rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
assoc_data->supp_rates_len,
sband, &rates);
} else {
/*
* In case AP not provide any supported rates information
* before association, we send information element(s) with
* all rates that we support.
*/
rates = ~0;
rates_len = sband->n_bitrates;
}
skb = alloc_skb(local->hw.extra_tx_headroom +
sizeof(*mgmt) + /* bit too much but doesn't matter */
2 + assoc_data->ssid_len + /* SSID */
4 + rates_len + /* (extended) rates */
4 + /* power capability */
2 + 2 * sband->n_channels + /* supported channels */
2 + sizeof(struct ieee80211_ht_cap) + /* HT */
2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
assoc_data->ie_len + /* extra IEs */
9, /* WMM */
GFP_KERNEL);
if (!skb)
return;
skb_reserve(skb, local->hw.extra_tx_headroom);
capab = WLAN_CAPABILITY_ESS;
if (sband->band == IEEE80211_BAND_2GHZ) {
if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
}
if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
capab |= WLAN_CAPABILITY_PRIVACY;
if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
(local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
memset(mgmt, 0, 24);
memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
skb_put(skb, 10);
mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_REASSOC_REQ);
mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
mgmt->u.reassoc_req.listen_interval =
cpu_to_le16(local->hw.conf.listen_interval);
memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
ETH_ALEN);
} else {
skb_put(skb, 4);
mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_ASSOC_REQ);
mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
mgmt->u.assoc_req.listen_interval =
cpu_to_le16(local->hw.conf.listen_interval);
}
/* SSID */
pos = skb_put(skb, 2 + assoc_data->ssid_len);
*pos++ = WLAN_EID_SSID;
*pos++ = assoc_data->ssid_len;
memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
/* add all rates which were marked to be used above */
supp_rates_len = rates_len;
if (supp_rates_len > 8)
supp_rates_len = 8;
pos = skb_put(skb, supp_rates_len + 2);
*pos++ = WLAN_EID_SUPP_RATES;
*pos++ = supp_rates_len;
count = 0;
for (i = 0; i < sband->n_bitrates; i++) {
if (BIT(i) & rates) {
int rate = sband->bitrates[i].bitrate;
*pos++ = (u8) (rate / 5);
if (++count == 8)
break;
}
}
if (rates_len > count) {
pos = skb_put(skb, rates_len - count + 2);
*pos++ = WLAN_EID_EXT_SUPP_RATES;
*pos++ = rates_len - count;
for (i++; i < sband->n_bitrates; i++) {
if (BIT(i) & rates) {
int rate = sband->bitrates[i].bitrate;
*pos++ = (u8) (rate / 5);
}
}
}
if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
/* 1. power capabilities */
pos = skb_put(skb, 4);
*pos++ = WLAN_EID_PWR_CAPABILITY;
*pos++ = 2;
*pos++ = 0; /* min tx power */
*pos++ = chan->max_power; /* max tx power */
/* 2. supported channels */
/* TODO: get this in reg domain format */
pos = skb_put(skb, 2 * sband->n_channels + 2);
*pos++ = WLAN_EID_SUPPORTED_CHANNELS;
*pos++ = 2 * sband->n_channels;
for (i = 0; i < sband->n_channels; i++) {
*pos++ = ieee80211_frequency_to_channel(
sband->channels[i].center_freq);
*pos++ = 1; /* one channel in the subband*/
}
}
/* if present, add any custom IEs that go before HT */
if (assoc_data->ie_len && assoc_data->ie) {
static const u8 before_ht[] = {
WLAN_EID_SSID,
WLAN_EID_SUPP_RATES,
WLAN_EID_EXT_SUPP_RATES,
WLAN_EID_PWR_CAPABILITY,
WLAN_EID_SUPPORTED_CHANNELS,
WLAN_EID_RSN,
WLAN_EID_QOS_CAPA,
WLAN_EID_RRM_ENABLED_CAPABILITIES,
WLAN_EID_MOBILITY_DOMAIN,
WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
};
noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
before_ht, ARRAY_SIZE(before_ht),
offset);
pos = skb_put(skb, noffset - offset);
memcpy(pos, assoc_data->ie + offset, noffset - offset);
offset = noffset;
}
if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
sband, chan, sdata->smps_mode);
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
ieee80211_add_vht_ie(sdata, skb, sband,
&assoc_data->ap_vht_cap);
/* if present, add any custom non-vendor IEs that go after HT */
if (assoc_data->ie_len && assoc_data->ie) {
noffset = ieee80211_ie_split_vendor(assoc_data->ie,
assoc_data->ie_len,
offset);
pos = skb_put(skb, noffset - offset);
memcpy(pos, assoc_data->ie + offset, noffset - offset);
offset = noffset;
}
if (assoc_data->wmm) {
if (assoc_data->uapsd) {
qos_info = ifmgd->uapsd_queues;
qos_info |= (ifmgd->uapsd_max_sp_len <<
IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
} else {
qos_info = 0;
}
pos = skb_put(skb, 9);
*pos++ = WLAN_EID_VENDOR_SPECIFIC;
*pos++ = 7; /* len */
*pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
*pos++ = 0x50;
*pos++ = 0xf2;
*pos++ = 2; /* WME */
*pos++ = 0; /* WME info */
*pos++ = 1; /* WME ver */
*pos++ = qos_info;
}
/* add any remaining custom (i.e. vendor specific here) IEs */
if (assoc_data->ie_len && assoc_data->ie) {
noffset = assoc_data->ie_len;
pos = skb_put(skb, noffset - offset);
memcpy(pos, assoc_data->ie + offset, noffset - offset);
}
drv_mgd_prepare_tx(local, sdata);
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
IEEE80211_TX_INTFL_MLME_CONN_TX;
ieee80211_tx_skb(sdata, skb);
}
void ieee80211_send_pspoll(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_pspoll *pspoll;
struct sk_buff *skb;
skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
if (!skb)
return;
pspoll = (struct ieee80211_pspoll *) skb->data;
pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
ieee80211_tx_skb(sdata, skb);
}
void ieee80211_send_nullfunc(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
int powersave)
{
struct sk_buff *skb;
struct ieee80211_hdr_3addr *nullfunc;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
if (!skb)
return;
nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
if (powersave)
nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
IEEE80211_STA_CONNECTION_POLL))
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
ieee80211_tx_skb(sdata, skb);
}
static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata)
{
struct sk_buff *skb;
struct ieee80211_hdr *nullfunc;
__le16 fc;
if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
return;
skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
if (!skb)
return;
skb_reserve(skb, local->hw.extra_tx_headroom);
nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
memset(nullfunc, 0, 30);
fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
nullfunc->frame_control = fc;
memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
ieee80211_tx_skb(sdata, skb);
}
/* spectrum management related things */
static void ieee80211_chswitch_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
if (!ieee80211_sdata_running(sdata))
return;
mutex_lock(&ifmgd->mtx);
if (!ifmgd->associated)
goto out;
local->_oper_chandef = local->csa_chandef;
if (!local->ops->channel_switch) {
/* call "hw_config" only if doing sw channel switch */
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
} else {
/* update the device channel directly */
local->hw.conf.chandef = local->_oper_chandef;
}
/* XXX: shouldn't really modify cfg80211-owned data! */
ifmgd->associated->channel = local->_oper_chandef.chan;
/* XXX: wait for a beacon first? */
ieee80211_wake_queues_by_reason(&local->hw,
IEEE80211_MAX_QUEUE_MAP,
IEEE80211_QUEUE_STOP_REASON_CSA);
out:
ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
mutex_unlock(&ifmgd->mtx);
}
void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
trace_api_chswitch_done(sdata, success);
if (!success) {
sdata_info(sdata,
"driver channel switch failed, disconnecting\n");
ieee80211_queue_work(&sdata->local->hw,
&ifmgd->csa_connection_drop_work);
} else {
ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
}
}
EXPORT_SYMBOL(ieee80211_chswitch_done);
static void ieee80211_chswitch_timer(unsigned long data)
{
struct ieee80211_sub_if_data *sdata =
(struct ieee80211_sub_if_data *) data;
ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
}
static void
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
u64 timestamp, struct ieee802_11_elems *elems,
bool beacon)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct cfg80211_bss *cbss = ifmgd->associated;
struct ieee80211_bss *bss;
struct ieee80211_chanctx *chanctx;
enum ieee80211_band new_band;
int new_freq;
u8 new_chan_no;
u8 count;
u8 mode;
struct ieee80211_channel *new_chan;
struct cfg80211_chan_def new_chandef = {};
struct cfg80211_chan_def new_vht_chandef = {};
const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
const struct ieee80211_ht_operation *ht_oper;
int secondary_channel_offset = -1;
ASSERT_MGD_MTX(ifmgd);
if (!cbss)
return;
if (local->scanning)
return;
/* disregard subsequent announcements if we are already processing */
if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
return;
sec_chan_offs = elems->sec_chan_offs;
wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
ht_oper = elems->ht_operation;
if (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
IEEE80211_STA_DISABLE_40MHZ)) {
sec_chan_offs = NULL;
wide_bw_chansw_ie = NULL;
/* only used for bandwidth here */
ht_oper = NULL;
}
if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
wide_bw_chansw_ie = NULL;
if (elems->ext_chansw_ie) {
if (!ieee80211_operating_class_to_band(
elems->ext_chansw_ie->new_operating_class,
&new_band)) {
sdata_info(sdata,
"cannot understand ECSA IE operating class %d, disconnecting\n",
elems->ext_chansw_ie->new_operating_class);
ieee80211_queue_work(&local->hw,
&ifmgd->csa_connection_drop_work);
}
new_chan_no = elems->ext_chansw_ie->new_ch_num;
count = elems->ext_chansw_ie->count;
mode = elems->ext_chansw_ie->mode;
} else if (elems->ch_switch_ie) {
new_band = cbss->channel->band;
new_chan_no = elems->ch_switch_ie->new_ch_num;
count = elems->ch_switch_ie->count;
mode = elems->ch_switch_ie->mode;
} else {
/* nothing here we understand */
return;
}
bss = (void *)cbss->priv;
new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
sdata_info(sdata,
"AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
ifmgd->associated->bssid, new_freq);
ieee80211_queue_work(&local->hw,
&ifmgd->csa_connection_drop_work);
return;
}
if (!beacon && sec_chan_offs) {
secondary_channel_offset = sec_chan_offs->sec_chan_offs;
} else if (beacon && ht_oper) {
secondary_channel_offset =
ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET;
} else if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
/*
* If it's not a beacon, HT is enabled and the IE not present,
* it's 20 MHz, 802.11-2012 8.5.2.6:
* This element [the Secondary Channel Offset Element] is
* present when switching to a 40 MHz channel. It may be
* present when switching to a 20 MHz channel (in which
* case the secondary channel offset is set to SCN).
*/
secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
}
switch (secondary_channel_offset) {
default:
/* secondary_channel_offset was present but is invalid */
case IEEE80211_HT_PARAM_CHA_SEC_NONE:
cfg80211_chandef_create(&new_chandef, new_chan,
NL80211_CHAN_HT20);
break;
case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
cfg80211_chandef_create(&new_chandef, new_chan,
NL80211_CHAN_HT40PLUS);
break;
case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
cfg80211_chandef_create(&new_chandef, new_chan,
NL80211_CHAN_HT40MINUS);
break;
case -1:
cfg80211_chandef_create(&new_chandef, new_chan,
NL80211_CHAN_NO_HT);
break;
}
if (wide_bw_chansw_ie) {
new_vht_chandef.chan = new_chan;
new_vht_chandef.center_freq1 =
ieee80211_channel_to_frequency(
wide_bw_chansw_ie->new_center_freq_seg0,
new_band);
switch (wide_bw_chansw_ie->new_channel_width) {
default:
/* hmmm, ignore VHT and use HT if present */
case IEEE80211_VHT_CHANWIDTH_USE_HT:
new_vht_chandef.chan = NULL;
break;
case IEEE80211_VHT_CHANWIDTH_80MHZ:
new_vht_chandef.width = NL80211_CHAN_WIDTH_80;
break;
case IEEE80211_VHT_CHANWIDTH_160MHZ:
new_vht_chandef.width = NL80211_CHAN_WIDTH_160;
break;
case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
/* field is otherwise reserved */
new_vht_chandef.center_freq2 =
ieee80211_channel_to_frequency(
wide_bw_chansw_ie->new_center_freq_seg1,
new_band);
new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
break;
}
if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
chandef_downgrade(&new_vht_chandef);
if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
chandef_downgrade(&new_vht_chandef);
if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
new_vht_chandef.width > NL80211_CHAN_WIDTH_20)
chandef_downgrade(&new_vht_chandef);
}
/* if VHT data is there validate & use it */
if (new_vht_chandef.chan) {
if (!cfg80211_chandef_compatible(&new_vht_chandef,
&new_chandef)) {
sdata_info(sdata,
"AP %pM CSA has inconsistent channel data, disconnecting\n",
ifmgd->associated->bssid);
ieee80211_queue_work(&local->hw,
&ifmgd->csa_connection_drop_work);
return;
}
new_chandef = new_vht_chandef;
}
if (!cfg80211_chandef_usable(local->hw.wiphy, &new_chandef,
IEEE80211_CHAN_DISABLED)) {
sdata_info(sdata,
"AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
ifmgd->associated->bssid, new_freq,
new_chandef.width, new_chandef.center_freq1,
new_chandef.center_freq2);
ieee80211_queue_work(&local->hw,
&ifmgd->csa_connection_drop_work);
return;
}
ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
if (local->use_chanctx) {
sdata_info(sdata,
"not handling channel switch with channel contexts\n");
ieee80211_queue_work(&local->hw,
&ifmgd->csa_connection_drop_work);
return;
}
mutex_lock(&local->chanctx_mtx);
if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
mutex_unlock(&local->chanctx_mtx);
return;
}
chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
struct ieee80211_chanctx, conf);
if (chanctx->refcount > 1) {
sdata_info(sdata,
"channel switch with multiple interfaces on the same channel, disconnecting\n");
ieee80211_queue_work(&local->hw,
&ifmgd->csa_connection_drop_work);
mutex_unlock(&local->chanctx_mtx);
return;
}
mutex_unlock(&local->chanctx_mtx);
local->csa_chandef = new_chandef;
if (mode)
ieee80211_stop_queues_by_reason(&local->hw,
IEEE80211_MAX_QUEUE_MAP,
IEEE80211_QUEUE_STOP_REASON_CSA);
if (local->ops->channel_switch) {
/* use driver's channel switch callback */
struct ieee80211_channel_switch ch_switch = {
.timestamp = timestamp,
.block_tx = mode,
.chandef = new_chandef,
.count = count,
};
drv_channel_switch(local, &ch_switch);
return;
}
/* channel switch handled in software */
if (count <= 1)
ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
else
mod_timer(&ifmgd->chswitch_timer,
TU_TO_EXP_TIME(count * cbss->beacon_interval));
}
static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
struct ieee80211_channel *channel,
const u8 *country_ie, u8 country_ie_len,
const u8 *pwr_constr_elem)
{
struct ieee80211_country_ie_triplet *triplet;
int chan = ieee80211_frequency_to_channel(channel->center_freq);
int i, chan_pwr, chan_increment, new_ap_level;
bool have_chan_pwr = false;
/* Invalid IE */
if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
return 0;
triplet = (void *)(country_ie + 3);
country_ie_len -= 3;
switch (channel->band) {
default:
WARN_ON_ONCE(1);
/* fall through */
case IEEE80211_BAND_2GHZ:
case IEEE80211_BAND_60GHZ:
chan_increment = 1;
break;
case IEEE80211_BAND_5GHZ:
chan_increment = 4;
break;
}
/* find channel */
while (country_ie_len >= 3) {
u8 first_channel = triplet->chans.first_channel;
if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
goto next;
for (i = 0; i < triplet->chans.num_channels; i++) {
if (first_channel + i * chan_increment == chan) {
have_chan_pwr = true;
chan_pwr = triplet->chans.max_power;
break;
}
}
if (have_chan_pwr)
break;
next:
triplet++;
country_ie_len -= 3;
}
if (!have_chan_pwr)
return 0;
new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
if (sdata->ap_power_level == new_ap_level)
return 0;
sdata_info(sdata,
"Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
new_ap_level, chan_pwr, *pwr_constr_elem,
sdata->u.mgd.bssid);
sdata->ap_power_level = new_ap_level;
if (__ieee80211_recalc_txpower(sdata))
return BSS_CHANGED_TXPOWER;
return 0;
}
/* powersave */
static void ieee80211_enable_ps(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_conf *conf = &local->hw.conf;
/*
* If we are scanning right now then the parameters will
* take effect when scan finishes.
*/
if (local->scanning)
return;
if (conf->dynamic_ps_timeout > 0 &&
!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
mod_timer(&local->dynamic_ps_timer, jiffies +
msecs_to_jiffies(conf->dynamic_ps_timeout));
} else {
if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
ieee80211_send_nullfunc(local, sdata, 1);
if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
return;
conf->flags |= IEEE80211_CONF_PS;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
}
}
static void ieee80211_change_ps(struct ieee80211_local *local)
{
struct ieee80211_conf *conf = &local->hw.conf;
if (local->ps_sdata) {
ieee80211_enable_ps(local, local->ps_sdata);
} else if (conf->flags & IEEE80211_CONF_PS) {
conf->flags &= ~IEEE80211_CONF_PS;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
del_timer_sync(&local->dynamic_ps_timer);
cancel_work_sync(&local->dynamic_ps_enable_work);
}
}
static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *mgd = &sdata->u.mgd;
struct sta_info *sta = NULL;
bool authorized = false;
if (!mgd->powersave)
return false;
if (mgd->broken_ap)
return false;
if (!mgd->associated)
return false;
if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
IEEE80211_STA_CONNECTION_POLL))
return false;
rcu_read_lock();
sta = sta_info_get(sdata, mgd->bssid);
if (sta)
authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
rcu_read_unlock();
return authorized;
}
/* need to hold RTNL or interface lock */
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
{
struct ieee80211_sub_if_data *sdata, *found = NULL;
int count = 0;
int timeout;
if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
local->ps_sdata = NULL;
return;
}
list_for_each_entry(sdata, &local->interfaces, list) {
if (!ieee80211_sdata_running(sdata))
continue;
if (sdata->vif.type == NL80211_IFTYPE_AP) {
/* If an AP vif is found, then disable PS
* by setting the count to zero thereby setting
* ps_sdata to NULL.
*/
count = 0;
break;
}
if (sdata->vif.type != NL80211_IFTYPE_STATION)
continue;
found = sdata;
count++;
}
if (count == 1 && ieee80211_powersave_allowed(found)) {
s32 beaconint_us;
if (latency < 0)
latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
beaconint_us = ieee80211_tu_to_usec(
found->vif.bss_conf.beacon_int);
timeout = local->dynamic_ps_forced_timeout;
if (timeout < 0) {
/*
* Go to full PSM if the user configures a very low
* latency requirement.
* The 2000 second value is there for compatibility
* until the PM_QOS_NETWORK_LATENCY is configured
* with real values.
*/
if (latency > (1900 * USEC_PER_MSEC) &&
latency != (2000 * USEC_PER_SEC))
timeout = 0;
else
timeout = 100;
}
local->hw.conf.dynamic_ps_timeout = timeout;
if (beaconint_us > latency) {
local->ps_sdata = NULL;
} else {
int maxslp = 1;
u8 dtimper = found->u.mgd.dtim_period;
/* If the TIM IE is invalid, pretend the value is 1 */
if (!dtimper)
dtimper = 1;
else if (dtimper > 1)
maxslp = min_t(int, dtimper,
latency / beaconint_us);
local->hw.conf.max_sleep_period = maxslp;
local->hw.conf.ps_dtim_period = dtimper;
local->ps_sdata = found;
}
} else {
local->ps_sdata = NULL;
}
ieee80211_change_ps(local);
}
void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
{
bool ps_allowed = ieee80211_powersave_allowed(sdata);
if (sdata->vif.bss_conf.ps != ps_allowed) {
sdata->vif.bss_conf.ps = ps_allowed;
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
}
}
void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
{
struct ieee80211_local *local =
container_of(work, struct ieee80211_local,
dynamic_ps_disable_work);
if (local->hw.conf.flags & IEEE80211_CONF_PS) {
local->hw.conf.flags &= ~IEEE80211_CONF_PS;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
}
ieee80211_wake_queues_by_reason(&local->hw,
IEEE80211_MAX_QUEUE_MAP,
IEEE80211_QUEUE_STOP_REASON_PS);
}
void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
{
struct ieee80211_local *local =
container_of(work, struct ieee80211_local,
dynamic_ps_enable_work);
struct ieee80211_sub_if_data *sdata = local->ps_sdata;
struct ieee80211_if_managed *ifmgd;
unsigned long flags;
int q;
/* can only happen when PS was just disabled anyway */
if (!sdata)
return;
ifmgd = &sdata->u.mgd;
if (local->hw.conf.flags & IEEE80211_CONF_PS)
return;
if (local->hw.conf.dynamic_ps_timeout > 0) {
/* don't enter PS if TX frames are pending */
if (drv_tx_frames_pending(local)) {
mod_timer(&local->dynamic_ps_timer, jiffies +
msecs_to_jiffies(
local->hw.conf.dynamic_ps_timeout));
return;
}
/*
* transmission can be stopped by others which leads to
* dynamic_ps_timer expiry. Postpone the ps timer if it
* is not the actual idle state.
*/
spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
for (q = 0; q < local->hw.queues; q++) {
if (local->queue_stop_reasons[q]) {
spin_unlock_irqrestore(&local->queue_stop_reason_lock,
flags);
mod_timer(&local->dynamic_ps_timer, jiffies +
msecs_to_jiffies(
local->hw.conf.dynamic_ps_timeout));
return;
}
}
spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}
if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
if (drv_tx_frames_pending(local)) {
mod_timer(&local->dynamic_ps_timer, jiffies +
msecs_to_jiffies(
local->hw.conf.dynamic_ps_timeout));
} else {
ieee80211_send_nullfunc(local, sdata, 1);
/* Flush to get the tx status of nullfunc frame */
ieee80211_flush_queues(local, sdata);
}
}
if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
local->hw.conf.flags |= IEEE80211_CONF_PS;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
}
}
void ieee80211_dynamic_ps_timer(unsigned long data)
{
struct ieee80211_local *local = (void *) data;
if (local->quiescing || local->suspended)
return;
ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
}
void ieee80211_dfs_cac_timer_work(struct work_struct *work)
{
struct delayed_work *delayed_work =
container_of(work, struct delayed_work, work);
struct ieee80211_sub_if_data *sdata =
container_of(delayed_work, struct ieee80211_sub_if_data,
dfs_cac_timer_work);
ieee80211_vif_release_channel(sdata);
cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_FINISHED, GFP_KERNEL);
}
/* MLME */
static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
const u8 *wmm_param, size_t wmm_param_len)
{
struct ieee80211_tx_queue_params params;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
size_t left;
int count;
const u8 *pos;
u8 uapsd_queues = 0;
if (!local->ops->conf_tx)
return false;
if (local->hw.queues < IEEE80211_NUM_ACS)
return false;
if (!wmm_param)
return false;
if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
return false;
if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
uapsd_queues = ifmgd->uapsd_queues;
count = wmm_param[6] & 0x0f;
if (count == ifmgd->wmm_last_param_set)
return false;
ifmgd->wmm_last_param_set = count;
pos = wmm_param + 8;
left = wmm_param_len - 8;
memset(&params, 0, sizeof(params));
sdata->wmm_acm = 0;
for (; left >= 4; left -= 4, pos += 4) {
int aci = (pos[0] >> 5) & 0x03;
int acm = (pos[0] >> 4) & 0x01;
bool uapsd = false;
int queue;
switch (aci) {
case 1: /* AC_BK */
queue = 3;
if (acm)
sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
uapsd = true;
break;
case 2: /* AC_VI */
queue = 1;
if (acm)
sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
uapsd = true;
break;
case 3: /* AC_VO */
queue = 0;
if (acm)
sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
uapsd = true;
break;
case 0: /* AC_BE */
default:
queue = 2;
if (acm)
sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
uapsd = true;
break;
}
params.aifs = pos[0] & 0x0f;
params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
params.cw_min = ecw2cw(pos[1] & 0x0f);
params.txop = get_unaligned_le16(pos + 2);
params.acm = acm;
params.uapsd = uapsd;
mlme_dbg(sdata,
"WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
queue, aci, acm,
params.aifs, params.cw_min, params.cw_max,
params.txop, params.uapsd);
sdata->tx_conf[queue] = params;
if (drv_conf_tx(local, sdata, queue, &params))
sdata_err(sdata,
"failed to set TX queue parameters for queue %d\n",
queue);
}
/* enable WMM or activate new settings */
sdata->vif.bss_conf.qos = true;
return true;
}
static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
lockdep_assert_held(&sdata->local->mtx);
sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
IEEE80211_STA_BEACON_POLL);
ieee80211_run_deferred_scan(sdata->local);
}
static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
mutex_lock(&sdata->local->mtx);
__ieee80211_stop_poll(sdata);
mutex_unlock(&sdata->local->mtx);
}
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
u16 capab, bool erp_valid, u8 erp)
{
struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
u32 changed = 0;
bool use_protection;
bool use_short_preamble;
bool use_short_slot;
if (erp_valid) {
use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
} else {
use_protection = false;
use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
}
use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
use_short_slot = true;
if (use_protection != bss_conf->use_cts_prot) {
bss_conf->use_cts_prot = use_protection;
changed |= BSS_CHANGED_ERP_CTS_PROT;
}
if (use_short_preamble != bss_conf->use_short_preamble) {
bss_conf->use_short_preamble = use_short_preamble;
changed |= BSS_CHANGED_ERP_PREAMBLE;
}
if (use_short_slot != bss_conf->use_short_slot) {
bss_conf->use_short_slot = use_short_slot;
changed |= BSS_CHANGED_ERP_SLOT;
}
return changed;
}
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
struct cfg80211_bss *cbss,
u32 bss_info_changed)
{
struct ieee80211_bss *bss = (void *)cbss->priv;
struct ieee80211_local *local = sdata->local;
struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
bss_info_changed |= BSS_CHANGED_ASSOC;
bss_info_changed |= ieee80211_handle_bss_capability(sdata,
bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
beacon_loss_count * bss_conf->beacon_int));
sdata->u.mgd.associated = cbss;
memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
if (sdata->vif.p2p) {
const struct cfg80211_bss_ies *ies;
rcu_read_lock();
ies = rcu_dereference(cbss->ies);
if (ies) {
int ret;
ret = cfg80211_get_p2p_attr(
ies->data, ies->len,
IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
(u8 *) &bss_conf->p2p_noa_attr,
sizeof(bss_conf->p2p_noa_attr));
if (ret >= 2) {
sdata->u.mgd.p2p_noa_index =
bss_conf->p2p_noa_attr.index;
bss_info_changed |= BSS_CHANGED_P2P_PS;
}
}
rcu_read_unlock();
}
/* just to be sure */
ieee80211_stop_poll(sdata);
ieee80211_led_assoc(local, 1);
if (sdata->u.mgd.assoc_data->have_beacon) {
/*
* If the AP is buggy we may get here with no DTIM period
* known, so assume it's 1 which is the only safe assumption
* in that case, although if the TIM IE is broken powersave
* probably just won't work at all.
*/
bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
bss_info_changed |= BSS_CHANGED_DTIM_PERIOD;
} else {
bss_conf->dtim_period = 0;
}
bss_conf->assoc = 1;
/* Tell the driver to monitor connection quality (if supported) */
if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
bss_conf->cqm_rssi_thold)
bss_info_changed |= BSS_CHANGED_CQM;
/* Enable ARP filtering */
if (bss_conf->arp_addr_cnt)
bss_info_changed |= BSS_CHANGED_ARP_FILTER;
ieee80211_bss_info_change_notify(sdata, bss_info_changed);
mutex_lock(&local->iflist_mtx);
ieee80211_recalc_ps(local, -1);
mutex_unlock(&local->iflist_mtx);
ieee80211_recalc_smps(sdata);
ieee80211_recalc_ps_vif(sdata);
netif_carrier_on(sdata->dev);
}
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
u16 stype, u16 reason, bool tx,
u8 *frame_buf)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
u32 changed = 0;
ASSERT_MGD_MTX(ifmgd);
if (WARN_ON_ONCE(tx && !frame_buf))
return;
if (WARN_ON(!ifmgd->associated))
return;
ieee80211_stop_poll(sdata);
ifmgd->associated = NULL;
netif_carrier_off(sdata->dev);
/*
* if we want to get out of ps before disassoc (why?) we have
* to do it before sending disassoc, as otherwise the null-packet
* won't be valid.
*/
if (local->hw.conf.flags & IEEE80211_CONF_PS) {
local->hw.conf.flags &= ~IEEE80211_CONF_PS;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
}
local->ps_sdata = NULL;
/* disable per-vif ps */
ieee80211_recalc_ps_vif(sdata);
/* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
if (tx)
ieee80211_flush_queues(local, sdata);
/* deauthenticate/disassociate now */
if (tx || frame_buf)
ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
reason, tx, frame_buf);
/* flush out frame */
if (tx)
ieee80211_flush_queues(local, sdata);
/* clear bssid only after building the needed mgmt frames */
memset(ifmgd->bssid, 0, ETH_ALEN);
/* remove AP and TDLS peers */
sta_info_flush_defer(sdata);
/* finally reset all BSS / config parameters */
changed |= ieee80211_reset_erp_info(sdata);
ieee80211_led_assoc(local, 0);
changed |= BSS_CHANGED_ASSOC;
sdata->vif.bss_conf.assoc = false;
ifmgd->p2p_noa_index = -1;
memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
sizeof(sdata->vif.bss_conf.p2p_noa_attr));
/* on the next assoc, re-program HT/VHT parameters */
memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
del_timer_sync(&local->dynamic_ps_timer);
cancel_work_sync(&local->dynamic_ps_enable_work);
/* Disable ARP filtering */
if (sdata->vif.bss_conf.arp_addr_cnt)
changed |= BSS_CHANGED_ARP_FILTER;
sdata->vif.bss_conf.qos = false;
changed |= BSS_CHANGED_QOS;
/* The BSSID (not really interesting) and HT changed */
changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
ieee80211_bss_info_change_notify(sdata, changed);
/* disassociated - set to defaults now */
ieee80211_set_wmm_default(sdata, false);
del_timer_sync(&sdata->u.mgd.conn_mon_timer);
del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
del_timer_sync(&sdata->u.mgd.timer);
del_timer_sync(&sdata->u.mgd.chswitch_timer);
sdata->vif.bss_conf.dtim_period = 0;
ifmgd->flags = 0;
ieee80211_vif_release_channel(sdata);
}
void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
struct ieee80211_hdr *hdr)
{
/*
* We can postpone the mgd.timer whenever receiving unicast frames
* from AP because we know that the connection is working both ways
* at that time. But multicast frames (and hence also beacons) must
* be ignored here, because we need to trigger the timer during
* data idle periods for sending the periodic probe request to the
* AP we're connected to.
*/
if (is_multicast_ether_addr(hdr->addr1))
return;
ieee80211_sta_reset_conn_monitor(sdata);
}
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
mutex_lock(&local->mtx);
if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
IEEE80211_STA_CONNECTION_POLL))) {
mutex_unlock(&local->mtx);
return;
}
__ieee80211_stop_poll(sdata);
mutex_lock(&local->iflist_mtx);
ieee80211_recalc_ps(local, -1);
mutex_unlock(&local->iflist_mtx);
if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
goto out;
/*
* We've received a probe response, but are not sure whether
* we have or will be receiving any beacons or data, so let's
* schedule the timers again, just in case.
*/
ieee80211_sta_reset_beacon_monitor(sdata);
mod_timer(&ifmgd->conn_mon_timer,
round_jiffies_up(jiffies +
IEEE80211_CONNECTION_IDLE_TIME));
out:
mutex_unlock(&local->mtx);
}
void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
struct ieee80211_hdr *hdr, bool ack)
{
if (!ieee80211_is_data(hdr->frame_control))
return;
if (ieee80211_is_nullfunc(hdr->frame_control) &&
sdata->u.mgd.probe_send_count > 0) {
if (ack)
ieee80211_sta_reset_conn_monitor(sdata);
else
sdata->u.mgd.nullfunc_failed = true;
ieee80211_queue_work(&sdata->local->hw, &sdata->work);
return;
}
if (ack)
ieee80211_sta_reset_conn_monitor(sdata);
}
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
const u8 *ssid;
u8 *dst = ifmgd->associated->bssid;
u8 unicast_limit = max(1, max_probe_tries - 3);
/*
* Try sending broadcast probe requests for the last three
* probe requests after the first ones failed since some
* buggy APs only support broadcast probe requests.
*/
if (ifmgd->probe_send_count >= unicast_limit)
dst = NULL;
/*
* When the hardware reports an accurate Tx ACK status, it's
* better to send a nullfunc frame instead of a probe request,
* as it will kick us off the AP quickly if we aren't associated
* anymore. The timeout will be reset if the frame is ACKed by
* the AP.
*/
ifmgd->probe_send_count++;
if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
ifmgd->nullfunc_failed = false;
ieee80211_send_nullfunc(sdata->local, sdata, 0);
} else {
int ssid_len;
rcu_read_lock();
ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
if (WARN_ON_ONCE(ssid == NULL))
ssid_len = 0;
else
ssid_len = ssid[1];
ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
0, (u32) -1, true, 0,
ifmgd->associated->channel, false);
rcu_read_unlock();
}
ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
run_again(ifmgd, ifmgd->probe_timeout);
if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
ieee80211_flush_queues(sdata->local, sdata);
}
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
bool beacon)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
bool already = false;
if (!ieee80211_sdata_running(sdata))
return;
mutex_lock(&ifmgd->mtx);
if (!ifmgd->associated)
goto out;
mutex_lock(&sdata->local->mtx);
if (sdata->local->tmp_channel || sdata->local->scanning) {
mutex_unlock(&sdata->local->mtx);
goto out;
}
if (beacon) {
mlme_dbg_ratelimited(sdata,
"detected beacon loss from AP (missed %d beacons) - probing\n",
beacon_loss_count);
ieee80211_cqm_rssi_notify(&sdata->vif,
NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
GFP_KERNEL);
}
/*
* The driver/our work has already reported this event or the
* connection monitoring has kicked in and we have already sent
* a probe request. Or maybe the AP died and the driver keeps
* reporting until we disassociate...
*
* In either case we have to ignore the current call to this
* function (except for setting the correct probe reason bit)
* because otherwise we would reset the timer every time and
* never check whether we received a probe response!
*/
if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
IEEE80211_STA_CONNECTION_POLL))
already = true;
if (beacon)
ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
else
ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
mutex_unlock(&sdata->local->mtx);
if (already)
goto out;
mutex_lock(&sdata->local->iflist_mtx);
ieee80211_recalc_ps(sdata->local, -1);
mutex_unlock(&sdata->local->iflist_mtx);
ifmgd->probe_send_count = 0;
ieee80211_mgd_probe_ap_send(sdata);
out:
mutex_unlock(&ifmgd->mtx);
}
struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
struct ieee80211_vif *vif)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct cfg80211_bss *cbss;
struct sk_buff *skb;
const u8 *ssid;
int ssid_len;
if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
return NULL;
ASSERT_MGD_MTX(ifmgd);
if (ifmgd->associated)
cbss = ifmgd->associated;
else if (ifmgd->auth_data)
cbss = ifmgd->auth_data->bss;
else if (ifmgd->assoc_data)
cbss = ifmgd->assoc_data->bss;
else
return NULL;
rcu_read_lock();
ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
if (WARN_ON_ONCE(ssid == NULL))
ssid_len = 0;
else
ssid_len = ssid[1];
skb = ieee80211_build_probe_req(sdata, cbss->bssid,
(u32) -1, cbss->channel,
ssid + 2, ssid_len,
NULL, 0, true);
rcu_read_unlock();
return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
mutex_lock(&ifmgd->mtx);
if (!ifmgd->associated) {
mutex_unlock(&ifmgd->mtx);
return;
}
ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
true, frame_buf);
ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
ieee80211_wake_queues_by_reason(&sdata->local->hw,
IEEE80211_MAX_QUEUE_MAP,
IEEE80211_QUEUE_STOP_REASON_CSA);
mutex_unlock(&ifmgd->mtx);
/*
* must be outside lock due to cfg80211,
* but that's not a problem.
*/
cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
}
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
container_of(work, struct ieee80211_sub_if_data,
u.mgd.beacon_connection_loss_work);
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct sta_info *sta;
if (ifmgd->associated) {
rcu_read_lock();
sta = sta_info_get(sdata, ifmgd->bssid);
if (sta)
sta->beacon_loss_count++;
rcu_read_unlock();
}
if (ifmgd->connection_loss) {
sdata_info(sdata, "Connection to AP %pM lost\n",
ifmgd->bssid);
__ieee80211_disconnect(sdata);
} else {
ieee80211_mgd_probe_ap(sdata, true);
}
}
static void ieee80211_csa_connection_drop_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
container_of(work, struct ieee80211_sub_if_data,
u.mgd.csa_connection_drop_work);
__ieee80211_disconnect(sdata);
}
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
struct ieee80211_hw *hw = &sdata->local->hw;
trace_api_beacon_loss(sdata);
sdata->u.mgd.connection_loss = false;
ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_beacon_loss);
void ieee80211_connection_loss(struct ieee80211_vif *vif)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
struct ieee80211_hw *hw = &sdata->local->hw;
trace_api_connection_loss(sdata);
sdata->u.mgd.connection_loss = true;
ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);
static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
bool assoc)
{
struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
lockdep_assert_held(&sdata->u.mgd.mtx);
if (!assoc) {
sta_info_destroy_addr(sdata, auth_data->bss->bssid);
memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
sdata->u.mgd.flags = 0;
ieee80211_vif_release_channel(sdata);
}
cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
kfree(auth_data);
sdata->u.mgd.auth_data = NULL;
}
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt, size_t len)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
u8 *pos;
struct ieee802_11_elems elems;
u32 tx_flags = 0;
pos = mgmt->u.auth.variable;
ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
if (!elems.challenge)
return;
auth_data->expected_transaction = 4;
drv_mgd_prepare_tx(sdata->local, sdata);
if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
IEEE80211_TX_INTFL_MLME_CONN_TX;
ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
elems.challenge - 2, elems.challenge_len + 2,
auth_data->bss->bssid, auth_data->bss->bssid,
auth_data->key, auth_data->key_len,
auth_data->key_idx, tx_flags);
}
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt, size_t len)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
u8 bssid[ETH_ALEN];
u16 auth_alg, auth_transaction, status_code;
struct sta_info *sta;
lockdep_assert_held(&ifmgd->mtx);
if (len < 24 + 6)
return RX_MGMT_NONE;
if (!ifmgd->auth_data || ifmgd->auth_data->done)
return RX_MGMT_NONE;
memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
if (!ether_addr_equal(bssid, mgmt->bssid))
return RX_MGMT_NONE;
auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
status_code = le16_to_cpu(mgmt->u.auth.status_code);
if (auth_alg != ifmgd->auth_data->algorithm ||
auth_transaction != ifmgd->auth_data->expected_transaction) {
sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
auth_transaction,
ifmgd->auth_data->expected_transaction);
return RX_MGMT_NONE;
}
if (status_code != WLAN_STATUS_SUCCESS) {
sdata_info(sdata, "%pM denied authentication (status %d)\n",
mgmt->sa, status_code);
ieee80211_destroy_auth_data(sdata, false);
return RX_MGMT_CFG80211_RX_AUTH;
}
switch (ifmgd->auth_data->algorithm) {
case WLAN_AUTH_OPEN:
case WLAN_AUTH_LEAP:
case WLAN_AUTH_FT:
case WLAN_AUTH_SAE:
break;
case WLAN_AUTH_SHARED_KEY:
if (ifmgd->auth_data->expected_transaction != 4) {
ieee80211_auth_challenge(sdata, mgmt, len);
/* need another frame */
return RX_MGMT_NONE;
}
break;
default:
WARN_ONCE(1, "invalid auth alg %d",
ifmgd->auth_data->algorithm);
return RX_MGMT_NONE;
}
sdata_info(sdata, "authenticated\n");
ifmgd->auth_data->done = true;
ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
ifmgd->auth_data->timeout_started = true;
run_again(ifmgd, ifmgd->auth_data->timeout);
if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
ifmgd->auth_data->expected_transaction != 2) {
/*
* Report auth frame to user space for processing since another
* round of Authentication frames is still needed.
*/
return RX_MGMT_CFG80211_RX_AUTH;
}
/* move station state to auth */
mutex_lock(&sdata->local->sta_mtx);
sta = sta_info_get(sdata, bssid);
if (!sta) {
WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
goto out_err;
}
if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
sdata_info(sdata, "failed moving %pM to auth\n", bssid);
goto out_err;
}
mutex_unlock(&sdata->local->sta_mtx);
return RX_MGMT_CFG80211_RX_AUTH;
out_err:
mutex_unlock(&sdata->local->sta_mtx);
/* ignore frame -- wait for timeout */
return RX_MGMT_NONE;
}
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt, size_t len)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
const u8 *bssid = NULL;
u16 reason_code;
lockdep_assert_held(&ifmgd->mtx);
if (len < 24 + 2)
return RX_MGMT_NONE;
if (!ifmgd->associated ||
!ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
return RX_MGMT_NONE;
bssid = ifmgd->associated->bssid;
reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
bssid, reason_code);
ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
return RX_MGMT_CFG80211_DEAUTH;
}
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt, size_t len)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
u16 reason_code;
lockdep_assert_held(&ifmgd->mtx);
if (len < 24 + 2)
return RX_MGMT_NONE;
if (!ifmgd->associated ||
!ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
return RX_MGMT_NONE;
reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
mgmt->sa, reason_code);
ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
return RX_MGMT_CFG80211_DISASSOC;
}
static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
u8 *supp_rates, unsigned int supp_rates_len,
u32 *rates, u32 *basic_rates,
bool *have_higher_than_11mbit,
int *min_rate, int *min_rate_index)
{
int i, j;
for (i = 0; i < supp_rates_len; i++) {
int rate = (supp_rates[i] & 0x7f) * 5;
bool is_basic = !!(supp_rates[i] & 0x80);
if (rate > 110)
*have_higher_than_11mbit = true;
/*
* BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
* 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
*
* Note: Even through the membership selector and the basic
* rate flag share the same bit, they are not exactly
* the same.
*/
if (!!(supp_rates[i] & 0x80) &&
(supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
continue;
for (j = 0; j < sband->n_bitrates; j++) {
if (sband->bitrates[j].bitrate == rate) {
*rates |= BIT(j);
if (is_basic)
*basic_rates |= BIT(j);
if (rate < *min_rate) {
*min_rate = rate;
*min_rate_index = j;
}
break;
}
}
}
}
static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
bool assoc)
{
struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
lockdep_assert_held(&sdata->u.mgd.mtx);
if (!assoc) {
sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
sdata->u.mgd.flags = 0;
ieee80211_vif_release_channel(sdata);
}
kfree(assoc_data);
sdata->u.mgd.assoc_data = NULL;
}
static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
struct cfg80211_bss *cbss,
struct ieee80211_mgmt *mgmt, size_t len)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
struct ieee80211_supported_band *sband;
struct sta_info *sta;
u8 *pos;
u16 capab_info, aid;
struct ieee802_11_elems elems;
struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
const struct cfg80211_bss_ies *bss_ies = NULL;
struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
u32 changed = 0;
int err;
bool ret;
/* AssocResp and ReassocResp have identical structure */
aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
aid);
aid &= ~(BIT(15) | BIT(14));
ifmgd->broken_ap = false;
if (aid == 0 || aid > IEEE80211_MAX_AID) {
sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
aid);
aid = 0;
ifmgd->broken_ap = true;
}
pos = mgmt->u.assoc_resp.variable;
ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
if (!elems.supp_rates) {
sdata_info(sdata, "no SuppRates element in AssocResp\n");
return false;
}
ifmgd->aid = aid;
/*
* Some APs are erroneously not including some information in their
* (re)association response frames. Try to recover by using the data
* from the beacon or probe response. This seems to afflict mobile
* 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
* "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
*/
if ((assoc_data->wmm && !elems.wmm_param) ||
(!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
(!elems.ht_cap_elem || !elems.ht_operation)) ||
(!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
(!elems.vht_cap_elem || !elems.vht_operation))) {
const struct cfg80211_bss_ies *ies;
struct ieee802_11_elems bss_elems;
rcu_read_lock();
ies = rcu_dereference(cbss->ies);
if (ies)
bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
GFP_ATOMIC);
rcu_read_unlock();
if (!bss_ies)
return false;
ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
false, &bss_elems);
if (assoc_data->wmm &&
!elems.wmm_param && bss_elems.wmm_param) {
elems.wmm_param = bss_elems.wmm_param;
sdata_info(sdata,
"AP bug: WMM param missing from AssocResp\n");
}
/*
* Also check if we requested HT/VHT, otherwise the AP doesn't
* have to include the IEs in the (re)association response.
*/
if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
elems.ht_cap_elem = bss_elems.ht_cap_elem;
sdata_info(sdata,
"AP bug: HT capability missing from AssocResp\n");
}
if (!elems.ht_operation && bss_elems.ht_operation &&
!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
elems.ht_operation = bss_elems.ht_operation;
sdata_info(sdata,
"AP bug: HT operation missing from AssocResp\n");
}
if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
elems.vht_cap_elem = bss_elems.vht_cap_elem;
sdata_info(sdata,
"AP bug: VHT capa missing from AssocResp\n");
}
if (!elems.vht_operation && bss_elems.vht_operation &&
!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
elems.vht_operation = bss_elems.vht_operation;
sdata_info(sdata,
"AP bug: VHT operation missing from AssocResp\n");
}
}
/*
* We previously checked these in the beacon/probe response, so
* they should be present here. This is just a safety net.
*/
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
(!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
sdata_info(sdata,
"HT AP is missing WMM params or HT capability/operation\n");
ret = false;
goto out;
}
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
(!elems.vht_cap_elem || !elems.vht_operation)) {
sdata_info(sdata,
"VHT AP is missing VHT capability/operation\n");
ret = false;
goto out;
}
mutex_lock(&sdata->local->sta_mtx);
/*
* station info was already allocated and inserted before
* the association and should be available to us
*/
sta = sta_info_get(sdata, cbss->bssid);
if (WARN_ON(!sta)) {
mutex_unlock(&sdata->local->sta_mtx);
ret = false;
goto out;
}
sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
/* Set up internal HT/VHT capabilities */
if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
elems.ht_cap_elem, sta);
if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
elems.vht_cap_elem, sta);
/*
* Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
* in their association response, so ignore that data for our own
* configuration. If it changed since the last beacon, we'll get the
* next beacon and update then.
*/
/*
* If an operating mode notification IE is present, override the
* NSS calculation (that would be done in rate_control_rate_init())
* and use the # of streams from that element.
*/
if (elems.opmode_notif &&
!(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
u8 nss;
nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
nss += 1;
sta->sta.rx_nss = nss;
}
rate_control_rate_init(sta);
if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
set_sta_flag(sta, WLAN_STA_MFP);
if (elems.wmm_param)
set_sta_flag(sta, WLAN_STA_WME);
err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
if (err) {
sdata_info(sdata,
"failed to move station %pM to desired state\n",
sta->sta.addr);
WARN_ON(__sta_info_destroy(sta));
mutex_unlock(&sdata->local->sta_mtx);
ret = false;
goto out;
}
mutex_unlock(&sdata->local->sta_mtx);
/*
* Always handle WMM once after association regardless
* of the first value the AP uses. Setting -1 here has
* that effect because the AP values is an unsigned
* 4-bit value.
*/
ifmgd->wmm_last_param_set = -1;
if (elems.wmm_param)
ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
elems.wmm_param_len);
else
ieee80211_set_wmm_default(sdata, false);
changed |= BSS_CHANGED_QOS;
/* set AID and assoc capability,
* ieee80211_set_associated() will tell the driver */
bss_conf->aid = aid;
bss_conf->assoc_capability = capab_info;
ieee80211_set_associated(sdata, cbss, changed);
/*
* If we're using 4-addr mode, let the AP know that we're
* doing so, so that it can create the STA VLAN on its side
*/
if (ifmgd->use_4addr)
ieee80211_send_4addr_nullfunc(local, sdata);
/*
* Start timer to probe the connection to the AP now.
* Also start the timer that will detect beacon loss.
*/
ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
ieee80211_sta_reset_beacon_monitor(sdata);
ret = true;
out:
kfree(bss_ies);
return ret;
}
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt, size_t len,
struct cfg80211_bss **bss)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
u16 capab_info, status_code, aid;
struct ieee802_11_elems elems;
u8 *pos;
bool reassoc;
lockdep_assert_held(&ifmgd->mtx);
if (!assoc_data)
return RX_MGMT_NONE;
if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
return RX_MGMT_NONE;
/*
* AssocResp and ReassocResp have identical structure, so process both
* of them in this function.
*/
if (len < 24 + 6)
return RX_MGMT_NONE;
reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
sdata_info(sdata,
"RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
reassoc ? "Rea" : "A", mgmt->sa,
capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
pos = mgmt->u.assoc_resp.variable;
ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
elems.timeout_int &&
elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
u32 tu, ms;
tu = le32_to_cpu(elems.timeout_int->value);
ms = tu * 1024 / 1000;
sdata_info(sdata,
"%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
mgmt->sa, tu, ms);
assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
assoc_data->timeout_started = true;
if (ms > IEEE80211_ASSOC_TIMEOUT)
run_again(ifmgd, assoc_data->timeout);
return RX_MGMT_NONE;
}
*bss = assoc_data->bss;
if (status_code != WLAN_STATUS_SUCCESS) {
sdata_info(sdata, "%pM denied association (code=%d)\n",
mgmt->sa, status_code);
ieee80211_destroy_assoc_data(sdata, false);
} else {
if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
/* oops -- internal error -- send timeout for now */
ieee80211_destroy_assoc_data(sdata, false);
cfg80211_put_bss(sdata->local->hw.wiphy, *bss);
return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
}
sdata_info(sdata, "associated\n");
/*
* destroy assoc_data afterwards, as otherwise an idle
* recalc after assoc_data is NULL but before associated
* is set can cause the interface to go idle
*/
ieee80211_destroy_assoc_data(sdata, true);
}
return RX_MGMT_CFG80211_RX_ASSOC;
}
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt, size_t len,
struct ieee80211_rx_status *rx_status,
struct ieee802_11_elems *elems)
{
struct ieee80211_local *local = sdata->local;
int freq;
struct ieee80211_bss *bss;
struct ieee80211_channel *channel;
bool need_ps = false;
lockdep_assert_held(&sdata->u.mgd.mtx);
if ((sdata->u.mgd.associated &&
ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) ||
(sdata->u.mgd.assoc_data &&
ether_addr_equal(mgmt->bssid,
sdata->u.mgd.assoc_data->bss->bssid))) {
/* not previously set so we may need to recalc */
need_ps = sdata->u.mgd.associated && !sdata->u.mgd.dtim_period;
if (elems->tim && !elems->parse_error) {
const struct ieee80211_tim_ie *tim_ie = elems->tim;
sdata->u.mgd.dtim_period = tim_ie->dtim_period;
}
}
if (elems->ds_params)
freq = ieee80211_channel_to_frequency(elems->ds_params[0],
rx_status->band);
else
freq = rx_status->freq;
channel = ieee80211_get_channel(local->hw.wiphy, freq);
if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
return;
bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
channel);
if (bss)
ieee80211_rx_bss_put(local, bss);
if (!sdata->u.mgd.associated ||
!ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid))
return;
if (need_ps) {
mutex_lock(&local->iflist_mtx);
ieee80211_recalc_ps(local, -1);
mutex_unlock(&local->iflist_mtx);
}
ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
elems, true);
}
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_mgmt *mgmt = (void *)skb->data;
struct ieee80211_if_managed *ifmgd;
struct ieee80211_rx_status *rx_status = (void *) skb->cb;
size_t baselen, len = skb->len;
struct ieee802_11_elems elems;
ifmgd = &sdata->u.mgd;
ASSERT_MGD_MTX(ifmgd);
if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
return; /* ignore ProbeResp to foreign address */
baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
if (baselen > len)
return;
ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
false, &elems);
ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
if (ifmgd->associated &&
ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
ieee80211_reset_ap_probe(sdata);
if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
/* got probe response, continue with auth */
sdata_info(sdata, "direct probe responded\n");
ifmgd->auth_data->tries = 0;
ifmgd->auth_data->timeout = jiffies;
ifmgd->auth_data->timeout_started = true;
run_again(ifmgd, ifmgd->auth_data->timeout);
}
}
/*
* This is the canonical list of information elements we care about,
* the filter code also gives us all changes to the Microsoft OUI
* (00:50:F2) vendor IE which is used for WMM which we need to track.
*
* We implement beacon filtering in software since that means we can
* avoid processing the frame here and in cfg80211, and userspace
* will not be able to tell whether the hardware supports it or not.
*
* XXX: This list needs to be dynamic -- userspace needs to be able to
* add items it requires. It also needs to be able to tell us to
* look out for other vendor IEs.
*/
static const u64 care_about_ies =
(1ULL << WLAN_EID_COUNTRY) |
(1ULL << WLAN_EID_ERP_INFO) |
(1ULL << WLAN_EID_CHANNEL_SWITCH) |
(1ULL << WLAN_EID_PWR_CONSTRAINT) |
(1ULL << WLAN_EID_HT_CAPABILITY) |
(1ULL << WLAN_EID_HT_OPERATION);
static enum rx_mgmt_action
ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt, size_t len,
u8 *deauth_buf, struct ieee80211_rx_status *rx_status)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
size_t baselen;
struct ieee802_11_elems elems;
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx_conf *chanctx_conf;
struct ieee80211_channel *chan;
struct sta_info *sta;
u32 changed = 0;
bool erp_valid;
u8 erp_value = 0;
u32 ncrc;
u8 *bssid;
lockdep_assert_held(&ifmgd->mtx);
/* Process beacon from the current BSS */
baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
if (baselen > len)
return RX_MGMT_NONE;
rcu_read_lock();
chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
if (!chanctx_conf) {
rcu_read_unlock();
return RX_MGMT_NONE;
}
if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
rcu_read_unlock();
return RX_MGMT_NONE;
}
chan = chanctx_conf->def.chan;
rcu_read_unlock();
if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
ieee802_11_parse_elems(mgmt->u.beacon.variable,
len - baselen, false, &elems);
ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
ifmgd->assoc_data->have_beacon = true;
ifmgd->assoc_data->need_beacon = false;
if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
sdata->vif.bss_conf.sync_tsf =
le64_to_cpu(mgmt->u.beacon.timestamp);
sdata->vif.bss_conf.sync_device_ts =
rx_status->device_timestamp;
if (elems.tim)
sdata->vif.bss_conf.sync_dtim_count =
elems.tim->dtim_count;
else
sdata->vif.bss_conf.sync_dtim_count = 0;
}
/* continue assoc process */
ifmgd->assoc_data->timeout = jiffies;
ifmgd->assoc_data->timeout_started = true;
run_again(ifmgd, ifmgd->assoc_data->timeout);
return RX_MGMT_NONE;
}
if (!ifmgd->associated ||
!ether_addr_equal(mgmt->bssid, ifmgd