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tegrakernel/kernel/kernel-4.9/net/mac80211/mlme.c

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/*
* 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>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright (C) 2015 - 2016 Intel Deutschland GmbH
*
* 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/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).");
/*
* 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
/*
* 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_sub_if_data *sdata,
unsigned long timeout)
{
sdata_assert_lock(sdata);
if (!timer_pending(&sdata->u.mgd.timer) ||
time_before(timeout, sdata->u.mgd.timer.expires))
mod_timer(&sdata->u.mgd.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 (ieee80211_hw_check(&sdata->local->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(!ifmgd->associated))
return;
if (ifmgd->probe_send_count)
ifmgd->probe_send_count = 0;
if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
return;
mod_timer(&ifmgd->conn_mon_timer,
round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
}
static int ecw2cw(int ecw)
{
return (1 << ecw) - 1;
}
static u32
ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
struct ieee80211_supported_band *sband,
struct ieee80211_channel *channel,
const struct ieee80211_ht_cap *ht_cap,
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;
struct ieee80211_sta_ht_cap sta_ht_cap;
u32 ht_cfreq, ret;
memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
chandef->chan = channel;
chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
chandef->center_freq1 = channel->center_freq;
chandef->center_freq2 = 0;
if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
goto out;
}
chandef->width = NL80211_CHAN_WIDTH_20;
if (!(ht_cap->cap_info &
cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
ret = IEEE80211_STA_DISABLE_40MHZ;
vht_chandef = *chandef;
goto out;
}
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 (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
ieee80211_chandef_ht_oper(ht_oper, chandef);
} 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 = *chandef;
if (!ieee80211_chandef_vht_oper(vht_oper, &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_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:
/*
* When tracking the current AP, don't do any further checks if the
* new chandef is identical to the one we're currently using for the
* connection. This keeps us from playing ping-pong with regulatory,
* without it the following can happen (for example):
* - connect to an AP with 80 MHz, world regdom allows 80 MHz
* - AP advertises regdom US
* - CRDA loads regdom US with 80 MHz prohibited (old database)
* - the code below detects an unsupported channel, downgrades, and
* we disconnect from the AP in the caller
* - disconnect causes CRDA to reload world regdomain and the game
* starts anew.
* (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
*
* It seems possible that there are still scenarios with CSA or real
* bandwidth changes where a this could happen, but those cases are
* less common and wouldn't completely prevent using the AP.
*/
if (tracking &&
cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
return ret;
/* 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 |= ieee80211_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_cap *ht_cap,
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;
/*
* if bss configuration changed store the new one -
* this may be applicable even if channel is identical
*/
ht_opmode = le16_to_cpu(ht_oper->operation_mode);
if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
*changed |= BSS_CHANGED_HT;
sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
}
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_cap, 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 |= ieee80211_chandef_downgrade(&chandef);
if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
chandef.width == NL80211_CHAN_WIDTH_160)
flags |= ieee80211_chandef_downgrade(&chandef);
if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
chandef.width > NL80211_CHAN_WIDTH_20)
flags |= ieee80211_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);
}
return 0;
}
/* frame sending functions */
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);
}
/* This function determines vht capability flags for the association
* and builds the IE.
* Note - the function may set the owner of the MU-MIMO capability
*/
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)
{
struct ieee80211_local *local = sdata->local;
u8 *pos;
u32 cap;
struct ieee80211_sta_vht_cap vht_cap;
u32 mask, ap_bf_sts, our_bf_sts;
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) {
u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
bw == 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_MASK;
}
/*
* 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 |
IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
else if (!(ap_vht_cap->vht_cap_info &
cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
/*
* If some other vif is using the MU-MIMO capablity we cannot associate
* using MU-MIMO - this will lead to contradictions in the group-id
* mechanism.
* Ownership is defined since association request, in order to avoid
* simultaneous associations with MU-MIMO.
*/
if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
bool disable_mu_mimo = false;
struct ieee80211_sub_if_data *other;
list_for_each_entry_rcu(other, &local->interfaces, list) {
if (other->vif.mu_mimo_owner) {
disable_mu_mimo = true;
break;
}
}
if (disable_mu_mimo)
cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
else
sdata->vif.mu_mimo_owner = true;
}
mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
our_bf_sts = cap & mask;
if (ap_bf_sts < our_bf_sts) {
cap &= ~mask;
cap |= ap_bf_sts;
}
/* 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, shift;
u16 capab;
struct ieee80211_supported_band *sband;
struct ieee80211_chanctx_conf *chanctx_conf;
struct ieee80211_channel *chan;
u32 rate_flags, rates = 0;
sdata_assert_lock(sdata);
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;
rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
rcu_read_unlock();
sband = local->hw.wiphy->bands[chan->band];
shift = ieee80211_vif_get_shift(&sdata->vif);
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_parse_bitrates(&chanctx_conf->def, sband,
assoc_data->supp_rates,
assoc_data->supp_rates_len,
&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_len = 0;
for (i = 0; i < sband->n_bitrates; i++) {
if ((rate_flags & sband->bitrates[i].flags)
!= rate_flags)
continue;
rates |= BIT(i);
rates_len++;
}
}
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 == NL80211_BAND_2GHZ) {
capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
}
if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
capab |= WLAN_CAPABILITY_PRIVACY;
if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
capab |= WLAN_CAPABILITY_RADIO_MEASURE;
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 = DIV_ROUND_UP(sband->bitrates[i].bitrate,
5 * (1 << shift));
*pos++ = (u8) rate;
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;
rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
5 * (1 << shift));
*pos++ = (u8) rate;
}
}
}
if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
capab & WLAN_CAPABILITY_RADIO_MEASURE) {
pos = skb_put(skb, 4);
*pos++ = WLAN_EID_PWR_CAPABILITY;
*pos++ = 2;
*pos++ = 0; /* min tx power */
/* max tx power */
*pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
}
if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
/* 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) {
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_FAST_BSS_TRANSITION, /* reassoc only */
WLAN_EID_RIC_DATA, /* reassoc only */
WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
};
static const u8 after_ric[] = {
WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
WLAN_EID_HT_CAPABILITY,
WLAN_EID_BSS_COEX_2040,
WLAN_EID_EXT_CAPABILITY,
WLAN_EID_QOS_TRAFFIC_CAPA,
WLAN_EID_TIM_BCAST_REQ,
WLAN_EID_INTERWORKING,
/* 60GHz doesn't happen right now */
WLAN_EID_VHT_CAPABILITY,
WLAN_EID_OPMODE_NOTIF,
};
noffset = ieee80211_ie_split_ric(assoc_data->ie,
assoc_data->ie_len,
before_ht,
ARRAY_SIZE(before_ht),
after_ric,
ARRAY_SIZE(after_ric),
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 present, add any custom IEs that go before VHT */
if (assoc_data->ie_len) {
static const u8 before_vht[] = {
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,
WLAN_EID_HT_CAPABILITY,
WLAN_EID_BSS_COEX_2040,
WLAN_EID_EXT_CAPABILITY,
WLAN_EID_QOS_TRAFFIC_CAPA,
WLAN_EID_TIM_BCAST_REQ,
WLAN_EID_INTERWORKING,
};
/* RIC already taken above, so no need to handle here anymore */
noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
before_vht, ARRAY_SIZE(before_vht),
offset);
pos = skb_put(skb, noffset - offset);
memcpy(pos, assoc_data->ie + offset, noffset - offset);
offset = noffset;
}
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) {
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 = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
}
/* add any remaining custom (i.e. vendor specific here) IEs */
if (assoc_data->ie_len) {
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 (ieee80211_hw_check(&local->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,
bool 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 (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
if (ifmgd->flags & 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;
int ret;
if (!ieee80211_sdata_running(sdata))
return;
sdata_lock(sdata);
mutex_lock(&local->mtx);
mutex_lock(&local->chanctx_mtx);
if (!ifmgd->associated)
goto out;
if (!sdata->vif.csa_active)
goto out;
/*
* using reservation isn't immediate as it may be deferred until later
* with multi-vif. once reservation is complete it will re-schedule the
* work with no reserved_chanctx so verify chandef to check if it
* completed successfully
*/
if (sdata->reserved_chanctx) {
struct ieee80211_supported_band *sband = NULL;
struct sta_info *mgd_sta = NULL;
enum ieee80211_sta_rx_bandwidth bw = IEEE80211_STA_RX_BW_20;
/*
* with multi-vif csa driver may call ieee80211_csa_finish()
* many times while waiting for other interfaces to use their
* reservations
*/
if (sdata->reserved_ready)
goto out;
if (sdata->vif.bss_conf.chandef.width !=
sdata->csa_chandef.width) {
/*
* For managed interface, we need to also update the AP
* station bandwidth and align the rate scale algorithm
* on the bandwidth change. Here we only consider the
* bandwidth of the new channel definition (as channel
* switch flow does not have the full HT/VHT/HE
* information), assuming that if additional changes are
* required they would be done as part of the processing
* of the next beacon from the AP.
*/
switch (sdata->csa_chandef.width) {
case NL80211_CHAN_WIDTH_20_NOHT:
case NL80211_CHAN_WIDTH_20:
default:
bw = IEEE80211_STA_RX_BW_20;
break;
case NL80211_CHAN_WIDTH_40:
bw = IEEE80211_STA_RX_BW_40;
break;
case NL80211_CHAN_WIDTH_80:
bw = IEEE80211_STA_RX_BW_80;
break;
case NL80211_CHAN_WIDTH_80P80:
case NL80211_CHAN_WIDTH_160:
bw = IEEE80211_STA_RX_BW_160;
break;
}
mgd_sta = sta_info_get(sdata, ifmgd->bssid);
sband =
local->hw.wiphy->bands[sdata->csa_chandef.chan->band];
}
if (sdata->vif.bss_conf.chandef.width >
sdata->csa_chandef.width) {
mgd_sta->sta.bandwidth = bw;
rate_control_rate_update(local, sband, mgd_sta,
IEEE80211_RC_BW_CHANGED);
}
ret = ieee80211_vif_use_reserved_context(sdata);
if (ret) {
sdata_info(sdata,
"failed to use reserved channel context, disconnecting (err=%d)\n",
ret);
ieee80211_queue_work(&sdata->local->hw,
&ifmgd->csa_connection_drop_work);
goto out;
}
if (sdata->vif.bss_conf.chandef.width <
sdata->csa_chandef.width) {
mgd_sta->sta.bandwidth = bw;
rate_control_rate_update(local, sband, mgd_sta,
IEEE80211_RC_BW_CHANGED);
}
goto out;
}
if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
&sdata->csa_chandef)) {
sdata_info(sdata,
"failed to finalize channel switch, disconnecting\n");
ieee80211_queue_work(&sdata->local->hw,
&ifmgd->csa_connection_drop_work);
goto out;
}
ifmgd->csa_waiting_bcn = true;
ieee80211_sta_reset_beacon_monitor(sdata);
ieee80211_sta_reset_conn_monitor(sdata);
out:
mutex_unlock(&local->chanctx_mtx);
mutex_unlock(&local->mtx);
sdata_unlock(sdata);
}
static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
int ret;
sdata_assert_lock(sdata);
WARN_ON(!sdata->vif.csa_active);
if (sdata->csa_block_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
sdata->csa_block_tx = false;
}
sdata->vif.csa_active = false;
ifmgd->csa_waiting_bcn = false;
ret = drv_post_channel_switch(sdata);
if (ret) {
sdata_info(sdata,
"driver post channel switch failed, disconnecting\n");
ieee80211_queue_work(&local->hw,
&ifmgd->csa_connection_drop_work);
return;
}
cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
}
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, u32 device_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_chanctx_conf *conf;
struct ieee80211_chanctx *chanctx;
enum nl80211_band current_band;
struct ieee80211_csa_ie csa_ie;
struct ieee80211_channel_switch ch_switch;
int res;
sdata_assert_lock(sdata);
if (!cbss)
return;
if (local->scanning)
return;
/* disregard subsequent announcements if we are already processing */
if (sdata->vif.csa_active)
return;
current_band = cbss->channel->band;
memset(&csa_ie, 0, sizeof(csa_ie));
res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
ifmgd->flags,
ifmgd->associated->bssid, &csa_ie);
if (res < 0)
ieee80211_queue_work(&local->hw,
&ifmgd->csa_connection_drop_work);
if (res)
return;
if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.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,
csa_ie.chandef.chan->center_freq,
csa_ie.chandef.width, csa_ie.chandef.center_freq1,
csa_ie.chandef.center_freq2);
ieee80211_queue_work(&local->hw,
&ifmgd->csa_connection_drop_work);
return;
}
if (cfg80211_chandef_identical(&csa_ie.chandef,
&sdata->vif.bss_conf.chandef)) {
if (ifmgd->csa_ignored_same_chan)
return;
sdata_info(sdata,
"AP %pM tries to chanswitch to same channel, ignore\n",
ifmgd->associated->bssid);
ifmgd->csa_ignored_same_chan = true;
return;
}
/*
* Drop all TDLS peers - either we disconnect or move to a different
* channel from this point on. There's no telling what our peer will do.
* The TDLS WIDER_BW scenario is also problematic, as peers might now
* have an incompatible wider chandef.
*/
ieee80211_teardown_tdls_peers(sdata);
mutex_lock(&local->mtx);
mutex_lock(&local->chanctx_mtx);
conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
lockdep_is_held(&local->chanctx_mtx));
if (!conf) {
sdata_info(sdata,
"no channel context assigned to vif?, disconnecting\n");
goto drop_connection;
}
chanctx = container_of(conf, struct ieee80211_chanctx, conf);
if (local->use_chanctx &&
!ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
sdata_info(sdata,
"driver doesn't support chan-switch with channel contexts\n");
goto drop_connection;
}
ch_switch.timestamp = timestamp;
ch_switch.device_timestamp = device_timestamp;
ch_switch.block_tx = csa_ie.mode;
ch_switch.chandef = csa_ie.chandef;
ch_switch.count = csa_ie.count;
if (drv_pre_channel_switch(sdata, &ch_switch)) {
sdata_info(sdata,
"preparing for channel switch failed, disconnecting\n");
goto drop_connection;
}
res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
chanctx->mode, false);
if (res) {
sdata_info(sdata,
"failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
res);
goto drop_connection;
}
mutex_unlock(&local->chanctx_mtx);
sdata->vif.csa_active = true;
sdata->csa_chandef = csa_ie.chandef;
sdata->csa_block_tx = csa_ie.mode;
ifmgd->csa_ignored_same_chan = false;
if (sdata->csa_block_tx)
ieee80211_stop_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
mutex_unlock(&local->mtx);
cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
csa_ie.count);
if (local->ops->channel_switch) {
/* use driver's channel switch callback */
drv_channel_switch(local, sdata, &ch_switch);
return;
}
/* channel switch handled in software */
if (csa_ie.count <= 1)
ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
else
mod_timer(&ifmgd->chswitch_timer,
TU_TO_EXP_TIME((csa_ie.count - 1) *
cbss->beacon_interval));
return;
drop_connection:
/*
* This is just so that the disconnect flow will know that
* we were trying to switch channel and failed. In case the
* mode is 1 (we are not allowed to Tx), we will know not to
* send a deauthentication frame. Those two fields will be
* reset when the disconnection worker runs.
*/
sdata->vif.csa_active = true;
sdata->csa_block_tx = csa_ie.mode;
ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
mutex_unlock(&local->chanctx_mtx);
mutex_unlock(&local->mtx);
}
static bool
ieee80211_find_80211h_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,
int *chan_pwr, int *pwr_reduction)
{
struct ieee80211_country_ie_triplet *triplet;
int chan = ieee80211_frequency_to_channel(channel->center_freq);
int i, chan_increment;
bool have_chan_pwr = false;
/* Invalid IE */
if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
return false;
triplet = (void *)(country_ie + 3);
country_ie_len -= 3;
switch (channel->band) {
default:
WARN_ON_ONCE(1);
/* fall through */
case NL80211_BAND_2GHZ:
case NL80211_BAND_60GHZ:
chan_increment = 1;
break;
case NL80211_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 && pwr_constr_elem)
*pwr_reduction = *pwr_constr_elem;
else
*pwr_reduction = 0;
return have_chan_pwr;
}
static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
struct ieee80211_channel *channel,
const u8 *cisco_dtpc_ie,
int *pwr_level)
{
/* From practical testing, the first data byte of the DTPC element
* seems to contain the requested dBm level, and the CLI on Cisco
* APs clearly state the range is -127 to 127 dBm, which indicates
* a signed byte, although it seemingly never actually goes negative.
* The other byte seems to always be zero.
*/
*pwr_level = (__s8)cisco_dtpc_ie[4];
}
static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
struct ieee80211_channel *channel,
struct ieee80211_mgmt *mgmt,
const u8 *country_ie, u8 country_ie_len,
const u8 *pwr_constr_ie,
const u8 *cisco_dtpc_ie)
{
bool has_80211h_pwr = false, has_cisco_pwr = false;
int chan_pwr = 0, pwr_reduction_80211h = 0;
int pwr_level_cisco, pwr_level_80211h;
int new_ap_level;
__le16 capab = mgmt->u.probe_resp.capab_info;
if (country_ie &&
(capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
sdata, channel, country_ie, country_ie_len,
pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
pwr_level_80211h =
max_t(int, 0, chan_pwr - pwr_reduction_80211h);
}
if (cisco_dtpc_ie) {
ieee80211_find_cisco_dtpc(
sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
has_cisco_pwr = true;
}
if (!has_80211h_pwr && !has_cisco_pwr)
return 0;
/* If we have both 802.11h and Cisco DTPC, apply both limits
* by picking the smallest of the two power levels advertised.
*/
if (has_80211h_pwr &&
(!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
new_ap_level = pwr_level_80211h;
if (sdata->ap_power_level == new_ap_level)
return 0;
sdata_dbg(sdata,
"Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
sdata->u.mgd.bssid);
} else { /* has_cisco_pwr is always true here. */
new_ap_level = pwr_level_cisco;
if (sdata->ap_power_level == new_ap_level)
return 0;
sdata_dbg(sdata,
"Limiting TX power to %d dBm as advertised by %pM\n",
pwr_level_cisco, 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 &&
!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
mod_timer(&local->dynamic_ps_timer, jiffies +
msecs_to_jiffies(conf->dynamic_ps_timeout));
} else {
if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
ieee80211_send_nullfunc(local, sdata, true);
if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
ieee80211_hw_check(&local->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_CONNECTION_POLL)
return false;
if (!mgd->have_beacon)
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)
{
struct ieee80211_sub_if_data *sdata, *found = NULL;
int count = 0;
int timeout;
if (!ieee80211_hw_check(&local->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)) {
u8 dtimper = found->u.mgd.dtim_period;
s32 beaconint_us;
beaconint_us = ieee80211_tu_to_usec(
found->vif.bss_conf.beacon_int);
timeout = local->dynamic_ps_forced_timeout;
if (timeout < 0)
timeout = 100;
local->hw.conf.dynamic_ps_timeout = timeout;
/* If the TIM IE is invalid, pretend the value is 1 */
if (!dtimper)
dtimper = 1;
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,
false);
}
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 (ieee80211_hw_check(&local->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, true);
/* Flush to get the tx status of nullfunc frame */
ieee80211_flush_queues(local, sdata, false);
}
}
if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
ieee80211_hw_check(&local->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;
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 = to_delayed_work(work);
struct ieee80211_sub_if_data *sdata =
container_of(delayed_work, struct ieee80211_sub_if_data,
dfs_cac_timer_work);
struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
mutex_lock(&sdata->local->mtx);
if (sdata->wdev.cac_started) {
ieee80211_vif_release_channel(sdata);
cfg80211_cac_event(sdata->dev, &chandef,
NL80211_RADAR_CAC_FINISHED,
GFP_KERNEL);
}
mutex_unlock(&sdata->local->mtx);
}
static bool
__ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
bool ret = false;
int ac;
if (local->hw.queues < IEEE80211_NUM_ACS)
return false;
for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
int non_acm_ac;
unsigned long now = jiffies;
if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
tx_tspec->admitted_time &&
time_after(now, tx_tspec->time_slice_start + HZ)) {
tx_tspec->consumed_tx_time = 0;
tx_tspec->time_slice_start = now;
if (tx_tspec->downgraded)
tx_tspec->action =
TX_TSPEC_ACTION_STOP_DOWNGRADE;
}
switch (tx_tspec->action) {
case TX_TSPEC_ACTION_STOP_DOWNGRADE:
/* take the original parameters */
if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
sdata_err(sdata,
"failed to set TX queue parameters for queue %d\n",
ac);
tx_tspec->action = TX_TSPEC_ACTION_NONE;
tx_tspec->downgraded = false;
ret = true;
break;
case TX_TSPEC_ACTION_DOWNGRADE:
if (time_after(now, tx_tspec->time_slice_start + HZ)) {
tx_tspec->action = TX_TSPEC_ACTION_NONE;
ret = true;
break;
}
/* downgrade next lower non-ACM AC */
for (non_acm_ac = ac + 1;
non_acm_ac < IEEE80211_NUM_ACS;
non_acm_ac++)
if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
break;
/* Usually the loop will result in using BK even if it
* requires admission control, but such a configuration
* makes no sense and we have to transmit somehow - the
* AC selection does the same thing.
* If we started out trying to downgrade from BK, then
* the extra condition here might be needed.
*/
if (non_acm_ac >= IEEE80211_NUM_ACS)
non_acm_ac = IEEE80211_AC_BK;
if (drv_conf_tx(local, sdata, ac,
&sdata->tx_conf[non_acm_ac]))
sdata_err(sdata,
"failed to set TX queue parameters for queue %d\n",
ac);
tx_tspec->action = TX_TSPEC_ACTION_NONE;
ret = true;
schedule_delayed_work(&ifmgd->tx_tspec_wk,
tx_tspec->time_slice_start + HZ - now + 1);
break;
case TX_TSPEC_ACTION_NONE:
/* nothing now */
break;
}
}
return ret;
}
void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
{
if (__ieee80211_sta_handle_tspec_ac_params(sdata))
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
}
static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata;
sdata = container_of(work, struct ieee80211_sub_if_data,
u.mgd.tx_tspec_wk.work);
ieee80211_sta_handle_tspec_ac_params(sdata);
}
/* 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[IEEE80211_NUM_ACS];
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
size_t left;
int count, ac;
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;
switch (aci) {
case 1: /* AC_BK */
ac = IEEE80211_AC_BK;
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 */
ac = IEEE80211_AC_VI;
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 */
ac = IEEE80211_AC_VO;
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:
ac = IEEE80211_AC_BE;
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[ac].aifs = pos[0] & 0x0f;
if (params[ac].aifs < 2) {
sdata_info(sdata,
"AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
params[ac].aifs, aci);
params[ac].aifs = 2;
}
params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
params[ac].txop = get_unaligned_le16(pos + 2);
params[ac].acm = acm;
params[ac].uapsd = uapsd;
if (params[ac].cw_min == 0 ||
params[ac].cw_min > params[ac].cw_max) {
sdata_info(sdata,
"AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
params[ac].cw_min, params[ac].cw_max, aci);
return false;
}
}
/* WMM specification requires all 4 ACIs. */
for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
if (params[ac].cw_min == 0) {
sdata_info(sdata,
"AP has invalid WMM params (missing AC %d), using defaults\n",
ac);
return false;
}
}
for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
mlme_dbg(sdata,
"WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
ac, params[ac].acm,
params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
params[ac].txop, params[ac].uapsd,
ifmgd->tx_tspec[ac].downgraded);
sdata->tx_conf[ac] = params[ac];
if (!ifmgd->tx_tspec[ac].downgraded &&
drv_conf_tx(local, sdata, ac, &params[ac]))
sdata_err(sdata,
"failed to set TX queue parameters for AC %d\n",
ac);
}
/* 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_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;
struct ieee80211_supported_band *sband;
u32 changed = 0;
bool use_protection;
bool use_short_preamble;
bool use_short_slot;
sband = ieee80211_get_sband(sdata);
if (!sband)
return changed;
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 (sband->band == NL80211_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 ||
sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
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.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_conf->beacon_rate = bss->beacon_rate;
bss_info_changed |= BSS_CHANGED_BEACON_INFO;
} else {
bss_conf->beacon_rate = NULL;
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);
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;
sdata_assert_lock(sdata);
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);
/* make sure ongoing transmission finishes */
synchronize_net();
/*
* drop any frame before deauth/disassoc, this can be data or
* management frame. Since we are disconnecting, we should not
* insist sending these frames which can take time and delay
* the disconnection and possible the roaming.
*/
if (tx)
ieee80211_flush_queues(local, sdata, true);
/* deauthenticate/disassociate now */
if (tx || frame_buf)
ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
reason, tx, frame_buf);
/* flush out frame - make sure the deauth was actually sent */
if (tx)
ieee80211_flush_queues(local, sdata, false);
/* clear bssid only after building the needed mgmt frames */
eth_zero_addr(ifmgd->bssid);
/* remove AP and TDLS peers */
sta_info_flush(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));
/* reset MU-MIMO ownership and group data */
memset(sdata->vif.bss_conf.mu_group.membership, 0,
sizeof(sdata->vif.bss_conf.mu_group.membership));
memset(sdata->vif.bss_conf.mu_group.position, 0,
sizeof(sdata->vif.bss_conf.mu_group.position));
changed |= BSS_CHANGED_MU_GROUPS;
sdata->vif.mu_mimo_owner = false;
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, 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;
sdata->vif.bss_conf.beacon_rate = NULL;
ifmgd->have_beacon = false;
ifmgd->flags = 0;
mutex_lock(&local->mtx);
ieee80211_vif_release_channel(sdata);
sdata->vif.csa_active = false;
ifmgd->csa_waiting_bcn = false;
ifmgd->csa_ignored_same_chan = false;
if (sdata->csa_block_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
sdata->csa_block_tx = false;
}
mutex_unlock(&local->mtx);
/* existing TX TSPEC sessions no longer exist */
memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
}
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_CONNECTION_POLL))
goto out;
__ieee80211_stop_poll(sdata);
mutex_lock(&local->iflist_mtx);
ieee80211_recalc_ps(local);
mutex_unlock(&local->iflist_mtx);
if (ieee80211_hw_check(&sdata->local->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);
}
static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
struct ieee80211_hdr *hdr,
u16 tx_time)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
int ac = ieee80211_ac_from_tid(tid);
struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
unsigned long now = jiffies;
if (likely(!tx_tspec->admitted_time))
return;
if (time_after(now, tx_tspec->time_slice_start + HZ)) {
tx_tspec->consumed_tx_time = 0;
tx_tspec->time_slice_start = now;
if (tx_tspec->downgraded) {
tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
}
}
if (tx_tspec->downgraded)
return;
tx_tspec->consumed_tx_time += tx_time;
if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
tx_tspec->downgraded = true;
tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
}
}
void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
{
ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
if (!ieee80211_is_data(hdr->frame_control))
return;
if (ieee80211_is_any_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);
struct sta_info *sta;
/*
* 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 (dst) {
mutex_lock(&sdata->local->sta_mtx);
sta = sta_info_get(sdata, dst);
if (!WARN_ON(!sta))
ieee80211_check_fast_rx(sta);
mutex_unlock(&sdata->local->sta_mtx);
}
if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
ifmgd->nullfunc_failed = false;
ieee80211_send_nullfunc(sdata->local, sdata, false);
} 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, sdata->vif.addr, 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(sdata, ifmgd->probe_timeout);
}
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;
sdata_lock(sdata);
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_beacon_loss_notify(&sdata->vif, 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_CONNECTION_POLL)
already = true;
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);
mutex_unlock(&sdata->local->iflist_mtx);
ifmgd->probe_send_count = 0;
ieee80211_mgd_probe_ap_send(sdata);
out:
sdata_unlock(sdata);
}
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;
sdata_assert_lock(sdata);
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_ONCE(!ssid || ssid[1] > IEEE80211_MAX_SSID_LEN,
"invalid SSID element (len=%d)", ssid ? ssid[1] : -1))
ssid_len = 0;
else
ssid_len = ssid[1];
skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, 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_report_disconnect(struct ieee80211_sub_if_data *sdata,
const u8 *buf, size_t len, bool tx,
u16 reason)
{
struct ieee80211_event event = {
.type = MLME_EVENT,
.u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
.u.mlme.reason = reason,
};
if (tx)
cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
else
cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
drv_event_callback(sdata->local, sdata, &event);
}
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
bool tx;
sdata_lock(sdata);
if (!ifmgd->associated) {
sdata_unlock(sdata);
return;
}
tx = !sdata->csa_block_tx;
/* AP is probably out of range (or not reachable for another reason) so
* remove the bss struct for that AP.
*/
cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);
ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
tx, frame_buf);
mutex_lock(&local->mtx);
sdata->vif.csa_active = false;
ifmgd->csa_waiting_bcn = false;
if (sdata->csa_block_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
sdata->csa_block_tx = false;
}
mutex_unlock(&local->mtx);
ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), tx,
WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
sdata_unlock(sdata);
}
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;
if (ifmgd->associated)
ifmgd->beacon_loss_count++;
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;
sdata_assert_lock(sdata);
if (!assoc) {
/*
* we are not authenticated yet, the only timer that could be
* running is the timeout for the authentication response which
* which is not relevant anymore.
*/
del_timer_sync(&sdata->u.mgd.timer);
sta_info_destroy_addr(sdata, auth_data->bss->bssid);
eth_zero_addr(sdata->u.mgd.bssid);
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
sdata->u.mgd.flags = 0;
mutex_lock(&sdata->local->mtx);
ieee80211_vif_release_channel(sdata);
mutex_unlock(&sdata->local->mtx);
}
cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
kfree(auth_data);
sdata->u.mgd.auth_data = NULL;
}
static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
bool assoc, bool abandon)
{
struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
sdata_assert_lock(sdata);
if (!assoc) {
/*
* we are not associated yet, the only timer that could be
* running is the timeout for the association response which
* which is not relevant anymore.
*/
del_timer_sync(&sdata->u.mgd.timer);
sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
eth_zero_addr(sdata->u.mgd.bssid);
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
sdata->u.mgd.flags = 0;
sdata->vif.mu_mimo_owner = false;
mutex_lock(&sdata->local->mtx);
ieee80211_vif_release_channel(sdata);
mutex_unlock(&sdata->local->mtx);
if (abandon)
cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
}
kfree(assoc_data);
sdata->u.mgd.assoc_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 (ieee80211_hw_check(&local->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 void 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;
struct ieee80211_event event = {
.type = MLME_EVENT,
.u.mlme.data = AUTH_EVENT,
};
sdata_assert_lock(sdata);
if (len < 24 + 6)
return;
if (!ifmgd->auth_data || ifmgd->auth_data->done)
return;
memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
if (!ether_addr_equal(bssid, mgmt->bssid))
return;
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;
}
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);
cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
event.u.mlme.status = MLME_DENIED;
event.u.mlme.reason = status_code;
drv_event_callback(sdata->local, sdata, &event);
return;
}
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;
}
break;
default:
WARN_ONCE(1, "invalid auth alg %d",
ifmgd->auth_data->algorithm);
return;
}
event.u.mlme.status = MLME_SUCCESS;
drv_event_callback(sdata->local, sdata, &event);
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(sdata, 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.
*/
cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
return;
}
/* 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);
cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
return;
out_err:
mutex_unlock(&sdata->local->sta_mtx);
/* ignore frame -- wait for timeout */
}
#define case_WLAN(type) \
case WLAN_REASON_##type: return #type
const char *ieee80211_get_reason_code_string(u16 reason_code)
{
switch (reason_code) {
case_WLAN(UNSPECIFIED);
case_WLAN(PREV_AUTH_NOT_VALID);
case_WLAN(DEAUTH_LEAVING);
case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
case_WLAN(DISASSOC_AP_BUSY);
case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
case_WLAN(DISASSOC_STA_HAS_LEFT);
case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
case_WLAN(DISASSOC_BAD_POWER);
case_WLAN(DISASSOC_BAD_SUPP_CHAN);
case_WLAN(INVALID_IE);
case_WLAN(MIC_FAILURE);
case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
case_WLAN(IE_DIFFERENT);
case_WLAN(INVALID_GROUP_CIPHER);
case_WLAN(INVALID_PAIRWISE_CIPHER);
case_WLAN(INVALID_AKMP);
case_WLAN(UNSUPP_RSN_VERSION);
case_WLAN(INVALID_RSN_IE_CAP);
case_WLAN(IEEE8021X_FAILED);
case_WLAN(CIPHER_SUITE_REJECTED);
case_WLAN(DISASSOC_UNSPECIFIED_QOS);
case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
case_WLAN(DISASSOC_LOW_ACK);
case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
case_WLAN(QSTA_LEAVE_QBSS);
case_WLAN(QSTA_NOT_USE);
case_WLAN(QSTA_REQUIRE_SETUP);
case_WLAN(QSTA_TIMEOUT);
case_WLAN(QSTA_CIPHER_NOT_SUPP);
case_WLAN(MESH_PEER_CANCELED);
case_WLAN(MESH_MAX_PEERS);
case_WLAN(MESH_CONFIG);
case_WLAN(MESH_CLOSE);
case_WLAN(MESH_MAX_RETRIES);
case_WLAN(MESH_CONFIRM_TIMEOUT);
case_WLAN(MESH_INVALID_GTK);
case_WLAN(MESH_INCONSISTENT_PARAM);
case_WLAN(MESH_INVALID_SECURITY);
case_WLAN(MESH_PATH_ERROR);
case_WLAN(MESH_PATH_NOFORWARD);
case_WLAN(MESH_PATH_DEST_UNREACHABLE);
case_WLAN(MAC_EXISTS_IN_MBSS);
case_WLAN(MESH_CHAN_REGULATORY);
case_WLAN(MESH_CHAN);
default: return "<unknown>";
}
}
static void 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;
u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
sdata_assert_lock(sdata);
if (len < 24 + 2)
return;
if (!ether_addr_equal(mgmt->bssid, mgmt->sa)) {
ieee80211_tdls_handle_disconnect(sdata, mgmt->sa, reason_code);
return;
}
if (ifmgd->associated &&
ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
const u8 *bssid = ifmgd->associated->bssid;
sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
bssid, reason_code,
ieee80211_get_reason_code_string(reason_code));
ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
reason_code);
return;
}
if (ifmgd->assoc_data &&
ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
const u8 *bssid = ifmgd->assoc_data->bss->bssid;
sdata_info(sdata,
"deauthenticated from %pM while associating (Reason: %u=%s)\n",
bssid, reason_code,
ieee80211_get_reason_code_string(reason_code));
ieee80211_destroy_assoc_data(sdata, false, true);
cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
return;
}
}
static void 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;
sdata_assert_lock(sdata);
if (len < 24 + 2)
return;
if (!ifmgd->associated ||
!ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
return;
reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
if (!ether_addr_equal(mgmt->bssid, mgmt->sa)) {
ieee80211_tdls_handle_disconnect(sdata, mgmt->sa, reason_code);
return;
}
sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n",
mgmt->sa, reason_code,
ieee80211_get_reason_code_string(reason_code));
ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
}
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 shift, u32 rate_flags)
{
int i, j;
for (i = 0; i < supp_rates_len; i++) {
int rate = supp_rates[i] & 0x7f;
bool is_basic = !!(supp_rates[i] & 0x80);
if ((rate * 5 * (1 << shift)) > 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++) {
struct ieee80211_rate *br;
int brate;
br = &sband->bitrates[j];
if ((rate_flags & br->flags) != rate_flags)
continue;
brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
if (brate == rate) {
*rates |= BIT(j);
if (is_basic)
*basic_rates |= BIT(j);
if ((rate * 5) < *min_rate) {
*min_rate = rate * 5;
*min_rate_index = j;
}
break;
}
}
}
}
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;
ifmgd->tdls_chan_switch_prohibited =
elems.ext_capab && elems.ext_capab_len >= 5 &&
(elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
/*
* 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 = ieee80211_get_sband(sdata);
if (!sband) {
mutex_unlock(&sdata->local->sta_mtx);
ret = false;
goto out;
}
/* 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);
sta->sta.mfp = true;
} else {
sta->sta.mfp = false;
}
sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
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 (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
ieee80211_set_wmm_default(sdata, false, false);
} else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
elems.wmm_param_len)) {
/* still enable QoS since we might have HT/VHT */
ieee80211_set_wmm_default(sdata, false, true);
/* set the disable-WMM flag in this case to disable
* tracking WMM parameter changes in the beacon if
* the parameters weren't actually valid. Doing so
* avoids changing parameters very strangely when
* the AP is going back and forth between valid and
* invalid parameters.
*/
ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
}
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 void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt,
size_t len)
{
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;
int ac, uapsd_queues = -1;
u8 *pos;
bool reassoc;
struct cfg80211_bss *bss;
struct ieee80211_event event = {
.type = MLME_EVENT,
.u.mlme.data = ASSOC_EVENT,
};
sdata_assert_lock(sdata);
if (!assoc_data)
return;
if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
return;
/*
* AssocResp and ReassocResp have identical structure, so process both
* of them in this function.
*/
if (len < 24 + 6)
return;
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(sdata, assoc_data->timeout);
return;
}
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, false);
event.u.mlme.status = MLME_DENIED;
event.u.mlme.reason = status_code;
drv_event_callback(sdata->local, sdata, &event);
} else {
if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
/* oops -- internal error -- send timeout for now */
ieee80211_destroy_assoc_data(sdata, false, false);
cfg80211_assoc_timeout(sdata->dev, bss);
return;
}
event.u.mlme.status = MLME_SUCCESS;
drv_event_callback(sdata->local, sdata, &event);
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, false);
/* get uapsd queues configuration */
uapsd_queues = 0;
for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
if (sdata->tx_conf[ac].uapsd)
uapsd_queues |= BIT(ac);
}
cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
}
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;
struct ieee80211_bss *bss;
struct ieee80211_channel *channel;
sdata_assert_lock(sdata);
channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
if (!channel)
return;
bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
channel);
if (bss) {
sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
ieee80211_rx_bss_put(local, bss);
}
}
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;
sdata_assert_lock(sdata);
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);
}
/*
* 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,
* as well as the DTPC IE (part of the Cisco OUI) used for signaling
* changes to requested client power.
*
* 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) |
(1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt, size_t len,
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;
u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
sdata_assert_lock(sdata);
/* Process beacon from the current BSS */
baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
if (baselen > len)
return;
rcu_read_lock();
chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
if (!chanctx_conf) {
rcu_read_unlock();
return;
}
if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
rcu_read_unlock();
return;
}
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);
if (elems.tim && !elems.parse_error) {
const struct ieee80211_tim_ie *tim_ie = elems.tim;
ifmgd->dtim_period = tim_ie->dtim_period;
}
ifmgd->have_beacon = true;
ifmgd->assoc_data->need_beacon = false;
if (ieee80211_hw_check(&local->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(sdata, ifmgd->assoc_data->timeout);
return;
}
if (!ifmgd->associated ||
!ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
return;
bssid = ifmgd->associated->bssid;
/* Track average RSSI from the Beacon frames of the current AP */
if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
ifmgd->last_cqm_event_signal = 0;
ifmgd->count_beacon_signal = 1;
ifmgd->last_ave_beacon_signal = 0;
} else {
ifmgd->count_beacon_signal++;
}
ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
int last_sig = ifmgd->last_ave_beacon_signal;
struct ieee80211_event event = {
.type = RSSI_EVENT,
};
/*
* if signal crosses either of the boundaries, invoke callback
* with appropriate parameters
*/
if (sig > ifmgd->rssi_max_thold &&
(last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
ifmgd->last_ave_beacon_signal = sig;
event.u.rssi.data = RSSI_EVENT_HIGH;
drv_event_callback(local, sdata, &event);
} else if (sig < ifmgd->rssi_min_thold &&
(last_sig >= ifmgd->rssi_max_thold ||
last_sig == 0)) {
ifmgd->last_ave_beacon_signal = sig;
event.u.rssi.data = RSSI_EVENT_LOW;
drv_event_callback(local, sdata, &event);
}
}
if (bss_conf->cqm_rssi_thold &&
ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
!(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
int last_event = ifmgd->last_cqm_event_signal;
int thold = bss_conf->cqm_rssi_thold;
int hyst = bss_conf->cqm_rssi_hyst;
if (sig < thold &&
(last_event == 0 || sig < last_event - hyst)) {
ifmgd->last_cqm_event_signal = sig;
ieee80211_cqm_rssi_notify(
&sdata->vif,
NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
GFP_KERNEL);
} else if (sig > thold &&
(last_event == 0 || sig > last_event + hyst)) {
ifmgd->last_cqm_event_signal = sig;
ieee80211_cqm_rssi_notify(
&sdata->vif,
NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
GFP_KERNEL);
}
}
if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
mlme_dbg_ratelimited(sdata,
"cancelling AP probe due to a received beacon\n");
ieee80211_reset_ap_probe(sdata);
}
/*
* Push the beacon loss detection into the future since
* we are processing a beacon from the AP just now.
*/
ieee80211_sta_reset_beacon_monitor(sdata);
ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
len - baselen, false, &elems,
care_about_ies, ncrc);
if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
if (local->hw.conf.dynamic_ps_timeout > 0) {
if (local->hw.conf.flags & IEEE80211_CONF_PS) {
local->hw.conf.flags &= ~IEEE80211_CONF_PS;
ieee80211_hw_config(local,
IEEE80211_CONF_CHANGE_PS);
}
ieee80211_send_nullfunc(local, sdata, false);
} else if (!local->pspolling && sdata->u.mgd.powersave) {
local->pspolling = true;
/*
* Here is assumed that the driver will be
* able to send ps-poll frame and receive a
* response even though power save mode is
* enabled, but some drivers might require
* to disable power save here. This needs
* to be investigated.
*/
ieee80211_send_pspoll(local, sdata);
}
}
if (sdata->vif.p2p ||
sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
struct ieee80211_p2p_noa_attr noa = {};
int ret;
ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
len - baselen,
IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
(u8 *) &noa, sizeof(noa));
if (ret >= 2) {
if (sdata->u.mgd.p2p_noa_index != noa.index) {
/* valid noa_attr and index changed */
sdata->u.mgd.p2p_noa_index = noa.index;
memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
changed |= BSS_CHANGED_P2P_PS;
/*
* make sure we update all information, the CRC
* mechanism doesn't look at P2P attributes.
*/
ifmgd->beacon_crc_valid = false;
}
} else if (sdata->u.mgd.p2p_noa_index != -1) {
/* noa_attr not found and we had valid noa_attr before */
sdata->u.mgd.p2p_noa_index = -1;
memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
changed |= BSS_CHANGED_P2P_PS;
ifmgd->beacon_crc_valid = false;
}
}
if (ifmgd->csa_waiting_bcn)
ieee80211_chswitch_post_beacon(sdata);
/*
* Update beacon timing and dtim count on every beacon appearance. This
* will allow the driver to use the most updated values. Do it before
* comparing this one with last received beacon.
* IMPORTANT: These parameters would possibly be out of sync by the time
* the driver will use them. The synchronized view is currently
* guaranteed only in certain callbacks.
*/
if (ieee80211_hw_check(&local->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;
}
if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
return;
ifmgd->beacon_crc = ncrc;
ifmgd->beacon_crc_valid = true;
ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
rx_status->device_timestamp,
&elems, true);
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
elems.wmm_param_len))
changed |= BSS_CHANGED_QOS;
/*
* If we haven't had a beacon before, tell the driver about the
* DTIM period (and beacon timing if desired) now.
*/
if (!ifmgd->have_beacon) {
/* a few bogus AP send dtim_period = 0 or no TIM IE */
if (elems.tim)
bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
else
bss_conf->dtim_period = 1;
changed |= BSS_CHANGED_BEACON_INFO;
ifmgd->have_beacon = true;
mutex_lock(&local->iflist_mtx);
ieee80211_recalc_ps(local);
mutex_unlock(&local->iflist_mtx);
ieee80211_recalc_ps_vif(sdata);
}
if (elems.erp_info) {
erp_valid = true;
erp_value = elems.erp_info[0];
} else {
erp_valid = false;
}
changed |= ieee80211_handle_bss_capability(sdata,
le16_to_cpu(mgmt->u.beacon.capab_info),
erp_valid, erp_value);
mutex_lock(&local->sta_mtx);
sta = sta_info_get(sdata, bssid);
if (ieee80211_config_bw(sdata, sta,
elems.ht_cap_elem, elems.ht_operation,
elems.vht_operation, bssid, &changed)) {
mutex_unlock(&local->sta_mtx);
sdata_info(sdata,
"failed to follow AP %pM bandwidth change, disconnect\n",
bssid);
ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
WLAN_REASON_DEAUTH_LEAVING,
true, deauth_buf);
ieee80211_report_disconnect(sdata, deauth_buf,
sizeof(deauth_buf), true,
WLAN_REASON_DEAUTH_LEAVING);
return;
}
if (sta && elems.opmode_notif)
ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
rx_status->band);
mutex_unlock(&local->sta_mtx);
changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
elems.country_elem,
elems.country_elem_len,
elems.pwr_constr_elem,
elems.cisco_dtpc_elem);
ieee80211_bss_info_change_notify(sdata, changed);
}
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_rx_status *rx_status;
struct ieee80211_mgmt *mgmt;
u16 fc;
struct ieee802_11_elems elems;
int ies_len;
rx_status = (struct ieee80211_rx_status *) skb->cb;
mgmt = (struct ieee80211_mgmt *) skb->data;
fc = le16_to_cpu(mgmt->frame_control);
sdata_lock(sdata);
switch (fc & IEEE80211_FCTL_STYPE) {
case IEEE80211_STYPE_BEACON:
ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
break;
case IEEE80211_STYPE_PROBE_RESP:
ieee80211_rx_mgmt_probe_resp(sdata, skb);
break;
case IEEE80211_STYPE_AUTH:
ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
break;
case IEEE80211_STYPE_DEAUTH:
ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
break;
case IEEE80211_STYPE_DISASSOC:
ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
break;
case IEEE80211_STYPE_ASSOC_RESP:
case IEEE80211_STYPE_REASSOC_RESP:
ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
break;
case IEEE80211_STYPE_ACTION:
if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
ies_len = skb->len -
offsetof(struct ieee80211_mgmt,
u.action.u.chan_switch.variable);
if (ies_len < 0)
break;
ieee802_11_parse_elems(
mgmt->u.action.u.chan_switch.variable,
ies_len, true, &elems);
if (elems.parse_error)
break;
ieee80211_sta_process_chanswitch(sdata,
rx_status->mactime,
rx_status->device_timestamp,
&elems, false);
} else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
ies_len = skb->len -
offsetof(struct ieee80211_mgmt,
u.action.u.ext_chan_switch.variable);
if (ies_len < 0)
break;
ieee802_11_parse_elems(
mgmt->u.action.u.ext_chan_switch.variable,
ies_len, true, &elems);
if (elems.parse_error)
break;
/* for the handling code pretend this was also an IE */
elems.ext_chansw_ie =
&mgmt->u.action.u.ext_chan_switch.data;
ieee80211_sta_process_chanswitch(sdata,
rx_status->mactime,
rx_status->device_timestamp,
&elems, false);
}
break;
}
sdata_unlock(sdata);
}
static void ieee80211_sta_timer(unsigned long data)
{
struct ieee80211_sub_if_data *sdata =
(struct ieee80211_sub_if_data *) data;
ieee80211_queue_work(&sdata->local->hw, &sdata->work);
}
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
u8 *bssid, u8 reason, bool tx)
{
u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
tx, frame_buf);
ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
reason);
}
static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
u32 tx_flags = 0;
u16 trans = 1;
u16 status = 0;
sdata_assert_lock(sdata);
if (WARN_ON_ONCE(!auth_data))
return -EINVAL;
auth_data->tries++;
if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
sdata_info(sdata, "authentication with %pM timed out\n",
auth_data->bss->bssid);
/*
* Most likely AP is not in the range so remove the
* bss struct for that AP.
*/
cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
return -ETIMEDOUT;
}
drv_mgd_prepare_tx(local, sdata);
sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
auth_data->bss->bssid, auth_data->tries,
IEEE80211_AUTH_MAX_TRIES);
auth_data->expected_transaction = 2;
if (auth_data->algorithm == WLAN_AUTH_SAE) {
trans = auth_data->sae_trans;
status = auth_data->sae_status;
auth_data->expected_transaction = trans;
}
if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
IEEE80211_TX_INTFL_MLME_CONN_TX;
ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
auth_data->data, auth_data->data_len,
auth_data->bss->bssid,
auth_data->bss->bssid, NULL, 0, 0,
tx_flags);
if (tx_flags == 0) {
auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
auth_data->timeout_started = true;
run_again(sdata, auth_data->timeout);
} else {
auth_data->timeout =
round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
auth_data->timeout_started = true;
run_again(sdata, auth_data->timeout);
}
return 0;
}
static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
struct ieee80211_local *local = sdata->local;
sdata_assert_lock(sdata);
assoc_data->tries++;
if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
sdata_info(sdata, "association with %pM timed out\n",
assoc_data->bss->bssid);
/*
* Most likely AP is not in the range so remove the
* bss struct for that AP.
*/
cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
return -ETIMEDOUT;
}
sdata_info(sdata, "associate with %pM (try %d/%d)\n",
assoc_data->bss->bssid, assoc_data->tries,
IEEE80211_ASSOC_MAX_TRIES);
ieee80211_send_assoc(sdata);
if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
assoc_data->timeout_started = true;
run_again(sdata, assoc_data->timeout);
} else {
assoc_data->timeout =
round_jiffies_up(jiffies +
IEEE80211_ASSOC_TIMEOUT_LONG);
assoc_data->timeout_started = true;
run_again(sdata, assoc_data->timeout);
}
return 0;
}
void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
__le16 fc, bool acked)
{
struct ieee80211_local *local = sdata->local;
sdata->u.mgd.status_fc = fc;
sdata->u.mgd.status_acked = acked;
sdata->u.mgd.status_received = true;
ieee80211_queue_work(&local->hw, &sdata->work);
}
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
sdata_lock(sdata);
if (ifmgd->status_received) {
__le16 fc = ifmgd->status_fc;
bool status_acked = ifmgd->status_acked;
ifmgd->status_received = false;
if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
if (status_acked) {
ifmgd->auth_data->timeout =
jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
run_again(sdata, ifmgd->auth_data->timeout);
} else {
ifmgd->auth_data->timeout = jiffies - 1;
}
ifmgd->auth_data->timeout_started = true;
} else if (ifmgd->assoc_data &&
(ieee80211_is_assoc_req(fc) ||
ieee80211_is_reassoc_req(fc))) {
if (status_acked) {
ifmgd->assoc_data->timeout =
jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
run_again(sdata, ifmgd->assoc_data->timeout);
} else {
ifmgd->assoc_data->timeout = jiffies - 1;
}
ifmgd->assoc_data->timeout_started = true;
}
}
if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
time_after(jiffies, ifmgd->auth_data->timeout)) {
if (ifmgd->auth_data->done) {
/*
* ok ... we waited for assoc but userspace didn't,
* so let's just kill the auth data
*/
ieee80211_destroy_auth_data(sdata, false);
} else if (ieee80211_auth(sdata)) {
u8 bssid[ETH_ALEN];
struct ieee80211_event event = {
.type = MLME_EVENT,
.u.mlme.data = AUTH_EVENT,
.u.mlme.status = MLME_TIMEOUT,
};
memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
ieee80211_destroy_auth_data(sdata, false);
cfg80211_auth_timeout(sdata->dev, bssid);
drv_event_callback(sdata->local, sdata, &event);
}
} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
run_again(sdata, ifmgd->auth_data->timeout);
if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
time_after(jiffies, ifmgd->assoc_data->timeout)) {
if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
ieee80211_do_assoc(sdata)) {
struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
struct ieee80211_event event = {
.type = MLME_EVENT,
.u.mlme.data = ASSOC_EVENT,
.u.mlme.status = MLME_TIMEOUT,
};
ieee80211_destroy_assoc_data(sdata, false, false);
cfg80211_assoc_timeout(sdata->dev, bss);
drv_event_callback(sdata->local, sdata, &event);
}
} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
run_again(sdata, ifmgd->assoc_data->timeout);
if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
ifmgd->associated) {
u8 bssid[ETH_ALEN];
int max_tries;
memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
max_tries = max_nullfunc_tries;
else
max_tries = max_probe_tries;
/* ACK received for nullfunc probing frame */
if (!ifmgd->probe_send_count)
ieee80211_reset_ap_probe(sdata);
else if (ifmgd->nullfunc_failed) {
if (ifmgd->probe_send_count < max_tries) {
mlme_dbg(sdata,
"No ack for nullfunc frame to AP %pM, try %d/%i\n",
bssid, ifmgd->probe_send_count,
max_tries);
ieee80211_mgd_probe_ap_send(sdata);
} else {
mlme_dbg(sdata,
"No ack for nullfunc frame to AP %pM, disconnecting.\n",
bssid);
ieee80211_sta_connection_lost(sdata, bssid,
WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
false);
}
} else if (time_is_after_jiffies(ifmgd->probe_timeout))
run_again(sdata, ifmgd->probe_timeout);
else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
mlme_dbg(sdata,
"Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
bssid, probe_wait_ms);
ieee80211_sta_connection_lost(sdata, bssid,
WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
} else if (ifmgd->probe_send_count < max_tries) {
mlme_dbg(sdata,
"No probe response from AP %pM after %dms, try %d/%i\n",
bssid, probe_wait_ms,
ifmgd->probe_send_count, max_tries);
ieee80211_mgd_probe_ap_send(sdata);
} else {
/*
* We actually lost the connection ... or did we?
* Let's make sure!
*/
mlme_dbg(sdata,
"No probe response from AP %pM after %dms, disconnecting.\n",
bssid, probe_wait_ms);
ieee80211_sta_connection_lost(sdata, bssid,
WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
}
}
sdata_unlock(sdata);
}
static void ieee80211_sta_bcn_mon_timer(unsigned long data)
{
struct ieee80211_sub_if_data *sdata =
(struct ieee80211_sub_if_data *) data;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
return;
sdata->u.mgd.connection_loss = false;
ieee80211_queue_work(&sdata->local->hw,
&sdata->u.mgd.beacon_connection_loss_work);
}
static void ieee80211_sta_conn_mon_timer(unsigned long data)
{
struct ieee80211_sub_if_data *sdata =
(struct ieee80211_sub_if_data *) data;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
return;
ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
}
static void ieee80211_sta_monitor_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
container_of(work, struct ieee80211_sub_if_data,
u.mgd.monitor_work);
ieee80211_mgd_probe_ap(sdata, false);
}
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
if (sdata->vif.type == NL80211_IFTYPE_STATION) {
__ieee80211_stop_poll(sdata);
/* let's probe the connection once */
if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
ieee80211_queue_work(&sdata->local->hw,
&sdata->u.mgd.monitor_work);
}
}
#ifdef CONFIG_PM
void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
sdata_lock(sdata);
if (ifmgd->auth_data || ifmgd->assoc_data) {
const u8 *bssid = ifmgd->auth_data ?
ifmgd->auth_data->bss->bssid :
ifmgd->assoc_data->bss->bssid;
/*
* If we are trying to authenticate / associate while suspending,
* cfg80211 won't know and won't actually abort those attempts,
* thus we need to do that ourselves.
*/
ieee80211_send_deauth_disassoc(sdata, bssid,
IEEE80211_STYPE_DEAUTH,
WLAN_REASON_DEAUTH_LEAVING,
false, frame_buf);
if (ifmgd->assoc_data)
ieee80211_destroy_assoc_data(sdata, false, true);
if (ifmgd->auth_data)
ieee80211_destroy_auth_data(sdata, false);
cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
IEEE80211_DEAUTH_FRAME_LEN);
}
/* This is a bit of a hack - we should find a better and more generic
* solution to this. Normally when suspending, cfg80211 will in fact
* deauthenticate. However, it doesn't (and cannot) stop an ongoing
* auth (not so important) or assoc (this is the problem) process.
*
* As a consequence, it can happen that we are in the process of both
* associating and suspending, and receive an association response
* after cfg80211 has checked if it needs to disconnect, but before
* we actually set the flag to drop incoming frames. This will then
* cause the workqueue flush to process the association response in
* the suspend, resulting in a successful association just before it
* tries to remove the interface from the driver, which now though
* has a channel context assigned ... this results in issues.
*
* To work around this (for now) simply deauth here again if we're
* now connected.
*/
if (ifmgd->associated && !sdata->local->wowlan) {
u8 bssid[ETH_ALEN];
struct cfg80211_deauth_request req = {
.reason_code = WLAN_REASON_DEAUTH_LEAVING,
.bssid = bssid,
};
memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
ieee80211_mgd_deauth(sdata, &req);
}
sdata_unlock(sdata);
}
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
sdata_lock(sdata);
if (!ifmgd->associated) {
sdata_unlock(sdata);
return;
}
if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
mlme_dbg(sdata, "driver requested disconnect after resume\n");
ieee80211_sta_connection_lost(sdata,
ifmgd->associated->bssid,
WLAN_REASON_UNSPECIFIED,
true);
sdata_unlock(sdata);
return;
}
sdata_unlock(sdata);
}
#endif
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd;
ifmgd = &sdata->u.mgd;
INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
INIT_WORK(&ifmgd->beacon_connection_loss_work,
ieee80211_beacon_connection_loss_work);
INIT_WORK(&ifmgd->csa_connection_drop_work,
ieee80211_csa_connection_drop_work);
INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
ieee80211_tdls_peer_del_work);
setup_timer(&ifmgd->timer, ieee80211_sta_timer,
(unsigned long) sdata);
setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
(unsigned long) sdata);
setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
(unsigned long) sdata);
setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
(unsigned long) sdata);
INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
ieee80211_sta_handle_tspec_ac_params_wk);
ifmgd->flags = 0;
ifmgd->powersave = sdata->wdev.ps;
ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
ifmgd->p2p_noa_index = -1;
if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
else
ifmgd->req_smps = IEEE80211_SMPS_OFF;
/* Setup TDLS data */
spin_lock_init(&ifmgd->teardown_lock);
ifmgd->teardown_skb = NULL;
ifmgd->orig_teardown_skb = NULL;
}
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
/* Restart STA timers */
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (ieee80211_sdata_running(sdata))
ieee80211_restart_sta_timer(sdata);
}
rcu_read_unlock();
}
static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
struct cfg80211_bss *cbss)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
const u8 *ht_cap_ie, *vht_cap_ie;
const struct ieee80211_ht_cap *ht_cap;
const struct ieee80211_vht_cap *vht_cap;
u8 chains = 1;
if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
return chains;
ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
ht_cap = (void *)(ht_cap_ie + 2);
chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
/*
* TODO: use "Tx Maximum Number Spatial Streams Supported" and
* "Tx Unequal Modulation Supported" fields.
*/
}
if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
return chains;
vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
u8 nss;
u16 tx_mcs_map;
vht_cap = (void *)(vht_cap_ie + 2);
tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
for (nss = 8; nss > 0; nss--) {
if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
IEEE80211_VHT_MCS_NOT_SUPPORTED)
break;
}
/* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
chains = max(chains, nss);
}
return chains;
}
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
struct cfg80211_bss *cbss)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
const struct ieee80211_ht_cap *ht_cap = NULL;
const struct ieee80211_ht_operation *ht_oper = NULL;
const struct ieee80211_vht_operation *vht_oper = NULL;
struct ieee80211_supported_band *sband;
struct cfg80211_chan_def chandef;
int ret;
u32 i;
bool have_80mhz;
sband = local->hw.wiphy->bands[cbss->channel->band];
ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
IEEE80211_STA_DISABLE_80P80MHZ |
IEEE80211_STA_DISABLE_160MHZ);
rcu_read_lock();
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
sband->ht_cap.ht_supported) {
const u8 *ht_oper_ie, *ht_cap_ie;
ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
ht_oper = (void *)(ht_oper_ie + 2);
ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
ht_cap = (void *)(ht_cap_ie + 2);
if (!ht_cap) {
ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
ht_oper = NULL;
}
}
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
sband->vht_cap.vht_supported) {
const u8 *vht_oper_ie, *vht_cap;
vht_oper_ie = ieee80211_bss_get_ie(cbss,
WLAN_EID_VHT_OPERATION);
if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
vht_oper = (void *)(vht_oper_ie + 2);
if (vht_oper && !ht_oper) {
vht_oper = NULL;
sdata_info(sdata,
"AP advertised VHT without HT, disabling both\n");
ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
}
vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
vht_oper = NULL;
}
}
/* Allow VHT if at least one channel on the sband supports 80 MHz */
have_80mhz = false;
for (i = 0; i < sband->n_channels; i++) {
if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
IEEE80211_CHAN_NO_80MHZ))
continue;
have_80mhz = true;
break;
}
if (!have_80mhz)
ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
cbss->channel,
ht_cap, ht_oper, vht_oper,
&chandef, false);
sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
local->rx_chains);
rcu_read_unlock();
/* will change later if needed */
sdata->smps_mode = IEEE80211_SMPS_OFF;
mutex_lock(&local->mtx);
/*
* If this fails (possibly due to channel context sharing
* on incompatible channels, e.g. 80+80 and 160 sharing the
* same control channel) try to use a smaller bandwidth.
*/
ret = ieee80211_vif_use_channel(sdata, &chandef,
IEEE80211_CHANCTX_SHARED);
/* don't downgrade for 5 and 10 MHz channels, though. */
if (chandef.width == NL80211_CHAN_WIDTH_5 ||
chandef.width == NL80211_CHAN_WIDTH_10)
goto out;
while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
ret = ieee80211_vif_use_channel(sdata, &chandef,
IEEE80211_CHANCTX_SHARED);
}
out:
mutex_unlock(&local->mtx);
return ret;
}
static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
struct cfg80211_bss *cbss, bool assoc,
bool override)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_bss *bss = (void *)cbss->priv;
struct sta_info *new_sta = NULL;
struct ieee80211_supported_band *sband;
bool have_sta = false;
int err;
sband = local->hw.wiphy->bands[cbss->channel->band];
if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
return -EINVAL;
/* If a reconfig is happening, bail out */
if (local->in_reconfig)
return -EBUSY;
if (assoc) {
rcu_read_lock();
have_sta = sta_info_get(sdata, cbss->bssid);
rcu_read_unlock();
}
if (!have_sta) {
new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
if (!new_sta)
return -ENOMEM;
}
if (new_sta || override) {
err = ieee80211_prep_channel(sdata, cbss);
if (err) {
if (new_sta)
sta_info_free(local, new_sta);
return -EINVAL;
}
}
if (new_sta) {
u32 rates = 0, basic_rates = 0;
bool have_higher_than_11mbit;
int min_rate = INT_MAX, min_rate_index = -1;
struct ieee80211_chanctx_conf *chanctx_conf;
const struct cfg80211_bss_ies *ies;
int shift = ieee80211_vif_get_shift(&sdata->vif);
u32 rate_flags;
rcu_read_lock();
chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
if (WARN_ON(!chanctx_conf)) {
rcu_read_unlock();
sta_info_free(local, new_sta);
return -EINVAL;
}
rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
rcu_read_unlock();
ieee80211_get_rates(sband, bss->supp_rates,
bss->supp_rates_len,
&rates, &basic_rates,
&have_higher_than_11mbit,
&min_rate, &min_rate_index,
shift, rate_flags);
/*
* This used to be a workaround for basic rates missing
* in the association response frame. Now that we no
* longer use the basic rates from there, it probably
* doesn't happen any more, but keep the workaround so
* in case some *other* APs are buggy in different ways
* we can connect -- with a warning.
*/
if (!basic_rates && min_rate_index >= 0) {
sdata_info(sdata,
"No basic rates, using min rate instead\n");
basic_rates = BIT(min_rate_index);
}
new_sta->sta.supp_rates[cbss->channel->band] = rates;
sdata->vif.bss_conf.basic_rates = basic_rates;
/* cf. IEEE 802.11 9.2.12 */
if (cbss->channel->band == NL80211_BAND_2GHZ &&
have_higher_than_11mbit)
sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
else
sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
/* set timing information */
sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
rcu_read_lock();
ies = rcu_dereference(cbss->beacon_ies);
if (ies) {
const u8 *tim_ie;
sdata->vif.bss_conf.sync_tsf = ies->tsf;
sdata->vif.bss_conf.sync_device_ts =
bss->device_ts_beacon;
tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
ies->data, ies->len);
if (tim_ie && tim_ie[1] >= 2)
sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
else
sdata->vif.bss_conf.sync_dtim_count = 0;
} else if (!ieee80211_hw_check(&sdata->local->hw,
TIMING_BEACON_ONLY)) {
ies = rcu_dereference(cbss->proberesp_ies);
/* must be non-NULL since beacon IEs were NULL */
sdata->vif.bss_conf.sync_tsf = ies->tsf;
sdata->vif.bss_conf.sync_device_ts =
bss->device_ts_presp;
sdata->vif.bss_conf.sync_dtim_count = 0;
} else {
sdata->vif.bss_conf.sync_tsf = 0;
sdata->vif.bss_conf.sync_device_ts = 0;
sdata->vif.bss_conf.sync_dtim_count = 0;
}
rcu_read_unlock();
/* tell driver about BSSID, basic rates and timing */
ieee80211_bss_info_change_notify(sdata,
BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
BSS_CHANGED_BEACON_INT);
if (assoc)
sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
err = sta_info_insert(new_sta);
new_sta = NULL;
if (err) {
sdata_info(sdata,
"failed to insert STA entry for the AP (error %d)\n",
err);
return err;
}
} else
WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
/* Cancel scan to ensure that nothing interferes with connection */
if (local->scanning)
ieee80211_scan_cancel(local);
return 0;
}
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
struct cfg80211_auth_request *req)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_mgd_auth_data *auth_data;
u16 auth_alg;
int err;
/* prepare auth data structure */
switch (req->auth_type) {
case NL80211_AUTHTYPE_OPEN_SYSTEM:
auth_alg = WLAN_AUTH_OPEN;
break;
case NL80211_AUTHTYPE_SHARED_KEY:
if (IS_ERR(local->wep_tx_tfm))
return -EOPNOTSUPP;
auth_alg = WLAN_AUTH_SHARED_KEY;
break;
case NL80211_AUTHTYPE_FT:
auth_alg = WLAN_AUTH_FT;
break;
case NL80211_AUTHTYPE_NETWORK_EAP:
auth_alg = WLAN_AUTH_LEAP;
break;
case NL80211_AUTHTYPE_SAE:
auth_alg = WLAN_AUTH_SAE;
break;
default:
return -EOPNOTSUPP;
}
auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
req->ie_len, GFP_KERNEL);
if (!auth_data)
return -ENOMEM;
auth_data->bss = req->bss;
if (req->sae_data_len >= 4) {
__le16 *pos = (__le16 *) req->sae_data;
auth_data->sae_trans = le16_to_cpu(pos[0]);
auth_data->sae_status = le16_to_cpu(pos[1]);
memcpy(auth_data->data, req->sae_data + 4,
req->sae_data_len - 4);
auth_data->data_len += req->sae_data_len - 4;
}
if (req->ie && req->ie_len) {
memcpy(&auth_data->data[auth_data->data_len],
req->ie, req->ie_len);
auth_data->data_len += req->ie_len;
}
if (req->key && req->key_len) {
auth_data->key_len = req->key_len;
auth_data->key_idx = req->key_idx;
memcpy(auth_data->key, req->key, req->key_len);
}
auth_data->algorithm = auth_alg;
/* try to authenticate/probe */
if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
ifmgd->assoc_data) {
err = -EBUSY;
goto err_free;
}
if (ifmgd->auth_data)
ieee80211_destroy_auth_data(sdata, false);
/* prep auth_data so we don't go into idle on disassoc */
ifmgd->auth_data = auth_data;
if (ifmgd->associated) {
u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
sdata_info(sdata,
"disconnect from AP %pM for new auth to %pM\n",
ifmgd->associated->bssid, req->bss->bssid);
ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
WLAN_REASON_UNSPECIFIED,
false, frame_buf);
ieee80211_report_disconnect(sdata, frame_buf,
sizeof(frame_buf), true,
WLAN_REASON_UNSPECIFIED);
}
sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
err = ieee80211_prep_connection(sdata, req->bss, false, false);
if (err)
goto err_clear;
err = ieee80211_auth(sdata);
if (err) {
sta_info_destroy_addr(sdata, req->bss->bssid);
goto err_clear;
}
/* hold our own reference */
cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
return 0;
err_clear:
eth_zero_addr(ifmgd->bssid);
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
ifmgd->auth_data = NULL;
mutex_lock(&sdata->local->mtx);
ieee80211_vif_release_channel(sdata);
mutex_unlock(&sdata->local->mtx);
err_free:
kfree(auth_data);
return err;
}
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
struct cfg80211_assoc_request *req)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_bss *bss = (void *)req->bss->priv;
struct ieee80211_mgd_assoc_data *assoc_data;
const struct cfg80211_bss_ies *beacon_ies;
struct ieee80211_supported_band *sband;
const u8 *ssidie, *ht_ie, *vht_ie;
int i, err;
bool override = false;
assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
if (!assoc_data)
return -ENOMEM;
rcu_read_lock();
ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
if (!ssidie || ssidie[1] > sizeof(assoc_data->ssid)) {
rcu_read_unlock();
kfree(assoc_data);
return -EINVAL;
}
memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
assoc_data->ssid_len = ssidie[1];
rcu_read_unlock();
if (ifmgd->associated) {
u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
sdata_info(sdata,
"disconnect from AP %pM for new assoc to %pM\n",
ifmgd->associated->bssid, req->bss->bssid);
ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
WLAN_REASON_UNSPECIFIED,
false, frame_buf);
ieee80211_report_disconnect(sdata, frame_buf,
sizeof(frame_buf), true,
WLAN_REASON_UNSPECIFIED);
}
if (ifmgd->auth_data && !ifmgd->auth_data->done) {
err = -EBUSY;
goto err_free;
}
if (ifmgd->assoc_data) {
err = -EBUSY;
goto err_free;
}
if (ifmgd->auth_data) {
bool match;
/* keep sta info, bssid if matching */
match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
ieee80211_destroy_auth_data(sdata, match);
}
/* prepare assoc data */
ifmgd->beacon_crc_valid = false;
assoc_data->wmm = bss->wmm_used &&
(local->hw.queues >= IEEE80211_NUM_ACS);
/*
* IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
* We still associate in non-HT mode (11a/b/g) if any one of these
* ciphers is configured as pairwise.
* We can set this to true for non-11n hardware, that'll be checked
* separately along with the peer capabilities.
*/
for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
netdev_info(sdata->dev,
"disabling HT/VHT due to WEP/TKIP use\n");
}
}
/* Also disable HT if we don't support it or the AP doesn't use WMM */
sband = local->hw.wiphy->bands[req->bss->channel->band];
if (!sband->ht_cap.ht_supported ||
local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
if (!bss->wmm_used &&
!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
netdev_info(sdata->dev,
"disabling HT as WMM/QoS is not supported by the AP\n");
}
/* disable VHT if we don't support it or the AP doesn't use WMM */
if (!sband->vht_cap.vht_supported ||
local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
if (!bss->wmm_used &&
!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
netdev_info(sdata->dev,
"disabling VHT as WMM/QoS is not supported by the AP\n");
}
memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
sizeof(ifmgd->ht_capa_mask));
memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
sizeof(ifmgd->vht_capa_mask));
if (req->ie && req->ie_len) {
memcpy(assoc_data->ie, req->ie, req->ie_len);
assoc_data->ie_len = req->ie_len;
}
assoc_data->bss = req->bss;
if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
if (ifmgd->powersave)
sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
else
sdata->smps_mode = IEEE80211_SMPS_OFF;
} else
sdata->smps_mode = ifmgd->req_smps;
assoc_data->capability = req->bss->capability;
assoc_data->supp_rates = bss->supp_rates;
assoc_data->supp_rates_len = bss->supp_rates_len;
rcu_read_lock();
ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
assoc_data->ap_ht_param =
((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
else
ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
sizeof(struct ieee80211_vht_cap));
else
ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
rcu_read_unlock();
if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
"U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
if (bss->wmm_used && bss->uapsd_supported &&
(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
assoc_data->uapsd = true;
ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
} else {
assoc_data->uapsd = false;
ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
}
if (req->prev_bssid)
memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
if (req->use_mfp) {
ifmgd->mfp = IEEE80211_MFP_REQUIRED;
ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
} else {
ifmgd->mfp = IEEE80211_MFP_DISABLED;
ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
}
if (req->flags & ASSOC_REQ_USE_RRM)
ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
else
ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
if (req->crypto.control_port)
ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
else
ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
sdata->control_port_protocol = req->crypto.control_port_ethertype;
sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
sdata->vif.type);
/* kick off associate process */
ifmgd->assoc_data = assoc_data;
ifmgd->dtim_period = 0;
ifmgd->have_beacon = false;
/* override HT/VHT configuration only if the AP and we support it */
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
struct ieee80211_sta_ht_cap sta_ht_cap;
if (req->flags & ASSOC_REQ_DISABLE_HT)
override = true;
memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
/* check for 40 MHz disable override */
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
!(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
override = true;
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
req->flags & ASSOC_REQ_DISABLE_VHT)
override = true;
}
if (req->flags & ASSOC_REQ_DISABLE_HT) {
ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
}
if (req->flags & ASSOC_REQ_DISABLE_VHT)
ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
err = ieee80211_prep_connection(sdata, req->bss, true, override);
if (err)
goto err_clear;
rcu_read_lock();
beacon_ies = rcu_dereference(req->bss->beacon_ies);
if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
!beacon_ies) {
/*
* Wait up to one beacon interval ...
* should this be more if we miss one?
*/
sdata_info(sdata, "waiting for beacon from %pM\n",
ifmgd->bssid);
assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
assoc_data->timeout_started = true;
assoc_data->need_beacon = true;
} else if (beacon_ies) {
const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
beacon_ies->data,
beacon_ies->len);
u8 dtim_count = 0;
if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
const struct ieee80211_tim_ie *tim;
tim = (void *)(tim_ie + 2);
ifmgd->dtim_period = tim->dtim_period;
dtim_count = tim->dtim_count;
}
ifmgd->have_beacon = true;
assoc_data->timeout = jiffies;
assoc_data->timeout_started = true;
if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
sdata->vif.bss_conf.sync_device_ts =
bss->device_ts_beacon;
sdata->vif.bss_conf.sync_dtim_count = dtim_count;
}
} else {
assoc_data->timeout = jiffies;
assoc_data->timeout_started = true;
}
rcu_read_unlock();
run_again(sdata, assoc_data->timeout);
if (bss->corrupt_data) {
char *corrupt_type = "data";
if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
if (bss->corrupt_data &
IEEE80211_BSS_CORRUPT_PROBE_RESP)
corrupt_type = "beacon and probe response";
else
corrupt_type = "beacon";
} else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
corrupt_type = "probe response";
sdata_info(sdata, "associating with AP with corrupt %s\n",
corrupt_type);
}
return 0;
err_clear:
eth_zero_addr(ifmgd->bssid);
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
ifmgd->assoc_data = NULL;
err_free:
kfree(assoc_data);
return err;
}
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
struct cfg80211_deauth_request *req)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
bool tx = !req->local_state_change;
if (ifmgd->auth_data &&
ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
sdata_info(sdata,
"aborting authentication with %pM by local choice (Reason: %u=%s)\n",
req->bssid, req->reason_code,
ieee80211_get_reason_code_string(req->reason_code));
drv_mgd_prepare_tx(sdata->local, sdata);
ieee80211_send_deauth_disassoc(sdata, req->bssid,
IEEE80211_STYPE_DEAUTH,
req->reason_code, tx,
frame_buf);
ieee80211_destroy_auth_data(sdata, false);
ieee80211_report_disconnect(sdata, frame_buf,
sizeof(frame_buf), true,
req->reason_code);
return 0;
}
if (ifmgd->assoc_data &&
ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
sdata_info(sdata,
"aborting association with %pM by local choice (Reason: %u=%s)\n",
req->bssid, req->reason_code,
ieee80211_get_reason_code_string(req->reason_code));
drv_mgd_prepare_tx(sdata->local, sdata);
ieee80211_send_deauth_disassoc(sdata, req->bssid,
IEEE80211_STYPE_DEAUTH,
req->reason_code, tx,
frame_buf);
ieee80211_destroy_assoc_data(sdata, false, true);
ieee80211_report_disconnect(sdata, frame_buf,
sizeof(frame_buf), true,
req->reason_code);
return 0;
}
if (ifmgd->associated &&
ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
sdata_info(sdata,
"deauthenticating from %pM by local choice (Reason: %u=%s)\n",
req->bssid, req->reason_code,
ieee80211_get_reason_code_string(req->reason_code));
ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
req->reason_code, tx, frame_buf);
ieee80211_report_disconnect(sdata, frame_buf,
sizeof(frame_buf), true,
req->reason_code);
return 0;
}
return -ENOTCONN;
}
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
struct cfg80211_disassoc_request *req)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
u8 bssid[ETH_ALEN];
u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
/*
* cfg80211 should catch this ... but it's racy since
* we can receive a disassoc frame, process it, hand it
* to cfg80211 while that's in a locked section already
* trying to tell us that the user wants to disconnect.
*/
if (ifmgd->associated != req->bss)
return -ENOLINK;
sdata_info(sdata,
"disassociating from %pM by local choice (Reason: %u=%s)\n",
req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
memcpy(bssid, req->bss->bssid, ETH_ALEN);
ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
req->reason_code, !req->local_state_change,
frame_buf);
ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
req->reason_code);
return 0;
}
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
/*
* Make sure some work items will not run after this,
* they will not do anything but might not have been
* cancelled when disconnecting.
*/
cancel_work_sync(&ifmgd->monitor_work);
cancel_work_sync(&ifmgd->beacon_connection_loss_work);
cancel_work_sync(&ifmgd->request_smps_work);
cancel_work_sync(&ifmgd->csa_connection_drop_work);
cancel_work_sync(&ifmgd->chswitch_work);
cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
sdata_lock(sdata);
if (ifmgd->assoc_data) {
struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
ieee80211_destroy_assoc_data(sdata, false, false);
cfg80211_assoc_timeout(sdata->dev, bss);
}
if (ifmgd->auth_data)
ieee80211_destroy_auth_data(sdata, false);
spin_lock_bh(&ifmgd->teardown_lock);
if (ifmgd->teardown_skb) {
kfree_skb(ifmgd->teardown_skb);
ifmgd->teardown_skb = NULL;
ifmgd->orig_teardown_skb = NULL;
}
spin_unlock_bh(&ifmgd->teardown_lock);
del_timer_sync(&ifmgd->timer);
sdata_unlock(sdata);
}
void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
enum nl80211_cqm_rssi_threshold_event rssi_event,
gfp_t gfp)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
trace_api_cqm_rssi_notify(sdata, rssi_event);
cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);
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