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mlme.c
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mlme.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* BSS client mode implementation
* Copyright 2003-2008, Jouni Malinen <[email protected]>
* Copyright 2004, Instant802 Networks, Inc.
* Copyright 2005, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <[email protected]>
* Copyright 2007, Michael Wu <[email protected]>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright (C) 2015 - 2017 Intel Deutschland GmbH
* Copyright (C) 2018 - 2023 Intel Corporation
*/
#include <linux/delay.h>
#include <linux/fips.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"
#include "fils_aead.h"
#define IEEE80211_AUTH_TIMEOUT (HZ / 5)
#define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2)
#define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10)
#define IEEE80211_AUTH_TIMEOUT_SAE (HZ * 2)
#define IEEE80211_AUTH_MAX_TRIES 3
#define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
#define IEEE80211_AUTH_WAIT_SAE_RETRY (HZ * 2)
#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
/*
* Extract from the given disabled subchannel bitmap (raw format
* from the EHT Operation Element) the bits for the subchannel
* we're using right now.
*/
static u16
ieee80211_extract_dis_subch_bmap(const struct ieee80211_eht_operation *eht_oper,
struct cfg80211_chan_def *chandef, u16 bitmap)
{
struct ieee80211_eht_operation_info *info = (void *)eht_oper->optional;
struct cfg80211_chan_def ap_chandef = *chandef;
u32 ap_center_freq, local_center_freq;
u32 ap_bw, local_bw;
int ap_start_freq, local_start_freq;
u16 shift, mask;
if (!(eht_oper->params & IEEE80211_EHT_OPER_INFO_PRESENT) ||
!(eht_oper->params &
IEEE80211_EHT_OPER_DISABLED_SUBCHANNEL_BITMAP_PRESENT))
return 0;
/* set 160/320 supported to get the full AP definition */
ieee80211_chandef_eht_oper(eht_oper, true, true, &ap_chandef);
ap_center_freq = ap_chandef.center_freq1;
ap_bw = 20 * BIT(u8_get_bits(info->control,
IEEE80211_EHT_OPER_CHAN_WIDTH));
ap_start_freq = ap_center_freq - ap_bw / 2;
local_center_freq = chandef->center_freq1;
local_bw = 20 * BIT(ieee80211_chan_width_to_rx_bw(chandef->width));
local_start_freq = local_center_freq - local_bw / 2;
shift = (local_start_freq - ap_start_freq) / 20;
mask = BIT(local_bw / 20) - 1;
return (bitmap >> shift) & mask;
}
/*
* Handle the puncturing bitmap, possibly downgrading bandwidth to get a
* valid bitmap.
*/
static void
ieee80211_handle_puncturing_bitmap(struct ieee80211_link_data *link,
const struct ieee80211_eht_operation *eht_oper,
u16 bitmap, u64 *changed)
{
struct cfg80211_chan_def *chandef = &link->conf->chandef;
u16 extracted;
u64 _changed = 0;
if (!changed)
changed = &_changed;
while (chandef->width > NL80211_CHAN_WIDTH_40) {
extracted =
ieee80211_extract_dis_subch_bmap(eht_oper, chandef,
bitmap);
if (cfg80211_valid_disable_subchannel_bitmap(&bitmap,
chandef))
break;
link->u.mgd.conn_flags |=
ieee80211_chandef_downgrade(chandef);
*changed |= BSS_CHANGED_BANDWIDTH;
}
if (chandef->width <= NL80211_CHAN_WIDTH_40)
extracted = 0;
if (link->conf->eht_puncturing != extracted) {
link->conf->eht_puncturing = extracted;
*changed |= BSS_CHANGED_EHT_PUNCTURING;
}
}
/*
* 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 ieee80211_conn_flags_t
ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
struct ieee80211_link_data *link,
ieee80211_conn_flags_t conn_flags,
struct ieee80211_supported_band *sband,
struct ieee80211_channel *channel,
u32 vht_cap_info,
const struct ieee80211_ht_operation *ht_oper,
const struct ieee80211_vht_operation *vht_oper,
const struct ieee80211_he_operation *he_oper,
const struct ieee80211_eht_operation *eht_oper,
const struct ieee80211_s1g_oper_ie *s1g_oper,
struct cfg80211_chan_def *chandef, bool tracking)
{
struct cfg80211_chan_def vht_chandef;
struct ieee80211_sta_ht_cap sta_ht_cap;
ieee80211_conn_flags_t ret;
u32 ht_cfreq;
memset(chandef, 0, sizeof(struct cfg80211_chan_def));
chandef->chan = channel;
chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
chandef->center_freq1 = channel->center_freq;
chandef->freq1_offset = channel->freq_offset;
if (channel->band == NL80211_BAND_6GHZ) {
if (!ieee80211_chandef_he_6ghz_oper(sdata, he_oper, eht_oper,
chandef)) {
mlme_dbg(sdata,
"bad 6 GHz operation, disabling HT/VHT/HE/EHT\n");
ret = IEEE80211_CONN_DISABLE_HT |
IEEE80211_CONN_DISABLE_VHT |
IEEE80211_CONN_DISABLE_HE |
IEEE80211_CONN_DISABLE_EHT;
} else {
ret = 0;
}
vht_chandef = *chandef;
goto out;
} else if (sband->band == NL80211_BAND_S1GHZ) {
if (!ieee80211_chandef_s1g_oper(s1g_oper, chandef)) {
sdata_info(sdata,
"Missing S1G Operation Element? Trying operating == primary\n");
chandef->width = ieee80211_s1g_channel_width(channel);
}
ret = IEEE80211_CONN_DISABLE_HT | IEEE80211_CONN_DISABLE_40MHZ |
IEEE80211_CONN_DISABLE_VHT |
IEEE80211_CONN_DISABLE_80P80MHZ |
IEEE80211_CONN_DISABLE_160MHZ;
goto out;
}
memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
if (!ht_oper || !sta_ht_cap.ht_supported) {
mlme_dbg(sdata, "HT operation missing / HT not supported\n");
ret = IEEE80211_CONN_DISABLE_HT |
IEEE80211_CONN_DISABLE_VHT |
IEEE80211_CONN_DISABLE_HE |
IEEE80211_CONN_DISABLE_EHT;
goto out;
}
chandef->width = NL80211_CHAN_WIDTH_20;
ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
channel->band);
/* check that channel matches the right operating channel */
if (!tracking && channel->center_freq != ht_cfreq) {
/*
* It's possible that some APs are confused here;
* Netgear WNDR3700 sometimes reports 4 higher than
* the actual channel in association responses, but
* since we look at probe response/beacon data here
* it should be OK.
*/
sdata_info(sdata,
"Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
channel->center_freq, ht_cfreq,
ht_oper->primary_chan, channel->band);
ret = IEEE80211_CONN_DISABLE_HT |
IEEE80211_CONN_DISABLE_VHT |
IEEE80211_CONN_DISABLE_HE |
IEEE80211_CONN_DISABLE_EHT;
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 {
mlme_dbg(sdata, "40 MHz not supported\n");
/* 40 MHz (and 80 MHz) must be supported for VHT */
ret = IEEE80211_CONN_DISABLE_VHT;
/* also mark 40 MHz disabled */
ret |= IEEE80211_CONN_DISABLE_40MHZ;
goto out;
}
if (!vht_oper || !sband->vht_cap.vht_supported) {
mlme_dbg(sdata, "VHT operation missing / VHT not supported\n");
ret = IEEE80211_CONN_DISABLE_VHT;
goto out;
}
vht_chandef = *chandef;
if (!(conn_flags & IEEE80211_CONN_DISABLE_HE) &&
he_oper &&
(le32_to_cpu(he_oper->he_oper_params) &
IEEE80211_HE_OPERATION_VHT_OPER_INFO)) {
struct ieee80211_vht_operation he_oper_vht_cap;
/*
* Set only first 3 bytes (other 2 aren't used in
* ieee80211_chandef_vht_oper() anyway)
*/
memcpy(&he_oper_vht_cap, he_oper->optional, 3);
he_oper_vht_cap.basic_mcs_set = cpu_to_le16(0);
if (!ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info,
&he_oper_vht_cap, ht_oper,
&vht_chandef)) {
if (!(conn_flags & IEEE80211_CONN_DISABLE_HE))
sdata_info(sdata,
"HE AP VHT information is invalid, disabling HE\n");
ret = IEEE80211_CONN_DISABLE_HE | IEEE80211_CONN_DISABLE_EHT;
goto out;
}
} else if (!ieee80211_chandef_vht_oper(&sdata->local->hw,
vht_cap_info,
vht_oper, ht_oper,
&vht_chandef)) {
if (!(conn_flags & IEEE80211_CONN_DISABLE_VHT))
sdata_info(sdata,
"AP VHT information is invalid, disabling VHT\n");
ret = IEEE80211_CONN_DISABLE_VHT;
goto out;
}
if (!cfg80211_chandef_valid(&vht_chandef)) {
if (!(conn_flags & IEEE80211_CONN_DISABLE_VHT))
sdata_info(sdata,
"AP VHT information is invalid, disabling VHT\n");
ret = IEEE80211_CONN_DISABLE_VHT;
goto out;
}
if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
ret = 0;
goto out;
}
if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
if (!(conn_flags & IEEE80211_CONN_DISABLE_VHT))
sdata_info(sdata,
"AP VHT information doesn't match HT, disabling VHT\n");
ret = IEEE80211_CONN_DISABLE_VHT;
goto out;
}
*chandef = vht_chandef;
/*
* handle the case that the EHT operation indicates that it holds EHT
* operation information (in case that the channel width differs from
* the channel width reported in HT/VHT/HE).
*/
if (eht_oper && (eht_oper->params & IEEE80211_EHT_OPER_INFO_PRESENT)) {
struct cfg80211_chan_def eht_chandef = *chandef;
ieee80211_chandef_eht_oper(eht_oper,
eht_chandef.width ==
NL80211_CHAN_WIDTH_160,
false, &eht_chandef);
if (!cfg80211_chandef_valid(&eht_chandef)) {
if (!(conn_flags & IEEE80211_CONN_DISABLE_EHT))
sdata_info(sdata,
"AP EHT information is invalid, disabling EHT\n");
ret = IEEE80211_CONN_DISABLE_EHT;
goto out;
}
if (!cfg80211_chandef_compatible(chandef, &eht_chandef)) {
if (!(conn_flags & IEEE80211_CONN_DISABLE_EHT))
sdata_info(sdata,
"AP EHT information is incompatible, disabling EHT\n");
ret = IEEE80211_CONN_DISABLE_EHT;
goto out;
}
*chandef = eht_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, &link->conf->chandef))
return ret;
/* don't print the message below for VHT mismatch if VHT is disabled */
if (ret & IEEE80211_CONN_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_CONN_DISABLE_HT |
IEEE80211_CONN_DISABLE_VHT |
IEEE80211_CONN_DISABLE_HE |
IEEE80211_CONN_DISABLE_EHT;
break;
}
ret |= ieee80211_chandef_downgrade(chandef);
}
if (!he_oper || !cfg80211_chandef_usable(sdata->wdev.wiphy, chandef,
IEEE80211_CHAN_NO_HE))
ret |= IEEE80211_CONN_DISABLE_HE | IEEE80211_CONN_DISABLE_EHT;
if (!eht_oper || !cfg80211_chandef_usable(sdata->wdev.wiphy, chandef,
IEEE80211_CHAN_NO_EHT))
ret |= IEEE80211_CONN_DISABLE_EHT;
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_link_data *link,
const struct ieee80211_ht_cap *ht_cap,
const struct ieee80211_vht_cap *vht_cap,
const struct ieee80211_ht_operation *ht_oper,
const struct ieee80211_vht_operation *vht_oper,
const struct ieee80211_he_operation *he_oper,
const struct ieee80211_eht_operation *eht_oper,
const struct ieee80211_s1g_oper_ie *s1g_oper,
const u8 *bssid, u64 *changed)
{
struct ieee80211_sub_if_data *sdata = link->sdata;
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_channel *chan = link->conf->chandef.chan;
struct ieee80211_supported_band *sband =
local->hw.wiphy->bands[chan->band];
struct cfg80211_chan_def chandef;
u16 ht_opmode;
ieee80211_conn_flags_t flags;
u32 vht_cap_info = 0;
int ret;
/* if HT was/is disabled, don't track any bandwidth changes */
if (link->u.mgd.conn_flags & IEEE80211_CONN_DISABLE_HT || !ht_oper)
return 0;
/* don't check VHT if we associated as non-VHT station */
if (link->u.mgd.conn_flags & IEEE80211_CONN_DISABLE_VHT)
vht_oper = NULL;
/* don't check HE if we associated as non-HE station */
if (link->u.mgd.conn_flags & IEEE80211_CONN_DISABLE_HE ||
!ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif)) {
he_oper = NULL;
eht_oper = NULL;
}
/* don't check EHT if we associated as non-EHT station */
if (link->u.mgd.conn_flags & IEEE80211_CONN_DISABLE_EHT ||
!ieee80211_get_eht_iftype_cap_vif(sband, &sdata->vif))
eht_oper = NULL;
/*
* 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 (link->conf->ht_operation_mode != ht_opmode) {
*changed |= BSS_CHANGED_HT;
link->conf->ht_operation_mode = ht_opmode;
}
if (vht_cap)
vht_cap_info = le32_to_cpu(vht_cap->vht_cap_info);
/* calculate new channel (type) based on HT/VHT/HE operation IEs */
flags = ieee80211_determine_chantype(sdata, link,
link->u.mgd.conn_flags,
sband, chan, vht_cap_info,
ht_oper, vht_oper,
he_oper, eht_oper,
s1g_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 (link->u.mgd.conn_flags & IEEE80211_CONN_DISABLE_80P80MHZ &&
chandef.width == NL80211_CHAN_WIDTH_80P80)
flags |= ieee80211_chandef_downgrade(&chandef);
if (link->u.mgd.conn_flags & IEEE80211_CONN_DISABLE_160MHZ &&
chandef.width == NL80211_CHAN_WIDTH_160)
flags |= ieee80211_chandef_downgrade(&chandef);
if (link->u.mgd.conn_flags & IEEE80211_CONN_DISABLE_40MHZ &&
chandef.width > NL80211_CHAN_WIDTH_20)
flags |= ieee80211_chandef_downgrade(&chandef);
if (cfg80211_chandef_identical(&chandef, &link->conf->chandef))
return 0;
link_info(link,
"AP %pM changed bandwidth, new config is %d.%03d MHz, width %d (%d.%03d/%d MHz)\n",
link->u.mgd.bssid, chandef.chan->center_freq,
chandef.chan->freq_offset, chandef.width,
chandef.center_freq1, chandef.freq1_offset,
chandef.center_freq2);
if (flags != (link->u.mgd.conn_flags &
(IEEE80211_CONN_DISABLE_HT |
IEEE80211_CONN_DISABLE_VHT |
IEEE80211_CONN_DISABLE_HE |
IEEE80211_CONN_DISABLE_EHT |
IEEE80211_CONN_DISABLE_40MHZ |
IEEE80211_CONN_DISABLE_80P80MHZ |
IEEE80211_CONN_DISABLE_160MHZ |
IEEE80211_CONN_DISABLE_320MHZ)) ||
!cfg80211_chandef_valid(&chandef)) {
sdata_info(sdata,
"AP %pM changed caps/bw in a way we can't support (0x%x/0x%x) - disconnect\n",
link->u.mgd.bssid, flags, ifmgd->flags);
return -EINVAL;
}
ret = ieee80211_link_change_bandwidth(link, &chandef, changed);
if (ret) {
sdata_info(sdata,
"AP %pM changed bandwidth to incompatible one - disconnect\n",
link->u.mgd.bssid);
return ret;
}
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,
ieee80211_conn_flags_t conn_flags)
{
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 (conn_flags & IEEE80211_CONN_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);
fallthrough;
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 returns true to own the MU-MIMO capability
*/
static bool 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,
ieee80211_conn_flags_t conn_flags)
{
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;
bool mu_mimo_owner = false;
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 (conn_flags & IEEE80211_CONN_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 (conn_flags & IEEE80211_CONN_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 capability 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.bss_conf.mu_mimo_owner) {
disable_mu_mimo = true;
break;
}
}
if (disable_mu_mimo)
cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
else
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);
return mu_mimo_owner;
}
/* This function determines HE capability flags for the association
* and builds the IE.
*/
static void ieee80211_add_he_ie(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb,
struct ieee80211_supported_band *sband,
enum ieee80211_smps_mode smps_mode,
ieee80211_conn_flags_t conn_flags)
{
u8 *pos, *pre_he_pos;
const struct ieee80211_sta_he_cap *he_cap;
u8 he_cap_size;
he_cap = ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif);
if (WARN_ON(!he_cap))
return;
/* get a max size estimate */
he_cap_size =
2 + 1 + sizeof(he_cap->he_cap_elem) +
ieee80211_he_mcs_nss_size(&he_cap->he_cap_elem) +
ieee80211_he_ppe_size(he_cap->ppe_thres[0],
he_cap->he_cap_elem.phy_cap_info);
pos = skb_put(skb, he_cap_size);
pre_he_pos = pos;
pos = ieee80211_ie_build_he_cap(conn_flags,
pos, he_cap, pos + he_cap_size);
/* trim excess if any */
skb_trim(skb, skb->len - (pre_he_pos + he_cap_size - pos));
ieee80211_ie_build_he_6ghz_cap(sdata, smps_mode, skb);
}
static void ieee80211_add_eht_ie(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb,
struct ieee80211_supported_band *sband)
{
u8 *pos;
const struct ieee80211_sta_he_cap *he_cap;
const struct ieee80211_sta_eht_cap *eht_cap;
u8 eht_cap_size;
he_cap = ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif);
eht_cap = ieee80211_get_eht_iftype_cap_vif(sband, &sdata->vif);
/*
* EHT capabilities element is only added if the HE capabilities element
* was added so assume that 'he_cap' is valid and don't check it.
*/
if (WARN_ON(!he_cap || !eht_cap))
return;
eht_cap_size =
2 + 1 + sizeof(eht_cap->eht_cap_elem) +
ieee80211_eht_mcs_nss_size(&he_cap->he_cap_elem,
&eht_cap->eht_cap_elem,
false) +
ieee80211_eht_ppe_size(eht_cap->eht_ppe_thres[0],
eht_cap->eht_cap_elem.phy_cap_info);
pos = skb_put(skb, eht_cap_size);
ieee80211_ie_build_eht_cap(pos, he_cap, eht_cap, pos + eht_cap_size,
false);
}
static void ieee80211_assoc_add_rates(struct sk_buff *skb,
enum nl80211_chan_width width,
struct ieee80211_supported_band *sband,
struct ieee80211_mgd_assoc_data *assoc_data)
{
unsigned int shift = ieee80211_chanwidth_get_shift(width);
unsigned int rates_len, supp_rates_len;
u32 rates = 0;
int i, count;
u8 *pos;
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(width, 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 = sband->n_bitrates;
for (i = 0; i < sband->n_bitrates; i++)
rates |= BIT(i);
}
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;
}
}
}
}
static size_t ieee80211_add_before_ht_elems(struct sk_buff *skb,
const u8 *elems,
size_t elems_len,
size_t offset)
{
size_t noffset;
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,
/* luckily this is almost always there */
WLAN_EID_EXT_CAPABILITY,
WLAN_EID_QOS_TRAFFIC_CAPA,
WLAN_EID_TIM_BCAST_REQ,
WLAN_EID_INTERWORKING,
/* 60 GHz (Multi-band, DMG, MMS) can't happen */
WLAN_EID_VHT_CAPABILITY,
WLAN_EID_OPMODE_NOTIF,
};
if (!elems_len)
return offset;
noffset = ieee80211_ie_split_ric(elems, elems_len,
before_ht,
ARRAY_SIZE(before_ht),
after_ric,
ARRAY_SIZE(after_ric),
offset);
skb_put_data(skb, elems + offset, noffset - offset);
return noffset;
}
static size_t ieee80211_add_before_vht_elems(struct sk_buff *skb,
const u8 *elems,
size_t elems_len,
size_t offset)
{
static const u8 before_vht[] = {
/*
* no need to list the ones split off before HT
* or generated here
*/
WLAN_EID_BSS_COEX_2040,
WLAN_EID_EXT_CAPABILITY,
WLAN_EID_QOS_TRAFFIC_CAPA,
WLAN_EID_TIM_BCAST_REQ,
WLAN_EID_INTERWORKING,
/* 60 GHz (Multi-band, DMG, MMS) can't happen */
};
size_t noffset;
if (!elems_len)
return offset;
/* RIC already taken care of in ieee80211_add_before_ht_elems() */
noffset = ieee80211_ie_split(elems, elems_len,
before_vht, ARRAY_SIZE(before_vht),
offset);
skb_put_data(skb, elems + offset, noffset - offset);
return noffset;
}
static size_t ieee80211_add_before_he_elems(struct sk_buff *skb,
const u8 *elems,
size_t elems_len,
size_t offset)
{
static const u8 before_he[] = {
/*
* no need to list the ones split off before VHT
* or generated here
*/
WLAN_EID_OPMODE_NOTIF,
WLAN_EID_EXTENSION, WLAN_EID_EXT_FUTURE_CHAN_GUIDANCE,
/* 11ai elements */
WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_SESSION,
WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_PUBLIC_KEY,
WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_KEY_CONFIRM,
WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_HLP_CONTAINER,
WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_IP_ADDR_ASSIGN,
/* TODO: add 11ah/11aj/11ak elements */
};
size_t noffset;
if (!elems_len)
return offset;