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chan.c
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/*
* mac80211 - channel management
*/
#include <linux/nl80211.h>
#include <linux/export.h>
#include <linux/rtnetlink.h>
#include <net/cfg80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
struct ieee80211_sub_if_data *sdata;
int num = 0;
lockdep_assert_held(&local->chanctx_mtx);
list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
num++;
return num;
}
static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
struct ieee80211_sub_if_data *sdata;
int num = 0;
lockdep_assert_held(&local->chanctx_mtx);
list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
num++;
return num;
}
int ieee80211_chanctx_refcount(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
return ieee80211_chanctx_num_assigned(local, ctx) +
ieee80211_chanctx_num_reserved(local, ctx);
}
static int ieee80211_num_chanctx(struct ieee80211_local *local)
{
struct ieee80211_chanctx *ctx;
int num = 0;
lockdep_assert_held(&local->chanctx_mtx);
list_for_each_entry(ctx, &local->chanctx_list, list)
num++;
return num;
}
static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local)
{
lockdep_assert_held(&local->chanctx_mtx);
return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local);
}
static struct ieee80211_chanctx *
ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local __maybe_unused = sdata->local;
struct ieee80211_chanctx_conf *conf;
conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
lockdep_is_held(&local->chanctx_mtx));
if (!conf)
return NULL;
return container_of(conf, struct ieee80211_chanctx, conf);
}
static const struct cfg80211_chan_def *
ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx,
const struct cfg80211_chan_def *compat)
{
struct ieee80211_sub_if_data *sdata;
lockdep_assert_held(&local->chanctx_mtx);
list_for_each_entry(sdata, &ctx->reserved_vifs,
reserved_chanctx_list) {
if (!compat)
compat = &sdata->reserved_chandef;
compat = cfg80211_chandef_compatible(&sdata->reserved_chandef,
compat);
if (!compat)
break;
}
return compat;
}
static const struct cfg80211_chan_def *
ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx,
const struct cfg80211_chan_def *compat)
{
struct ieee80211_sub_if_data *sdata;
lockdep_assert_held(&local->chanctx_mtx);
list_for_each_entry(sdata, &ctx->assigned_vifs,
assigned_chanctx_list) {
if (sdata->reserved_chanctx != NULL)
continue;
if (!compat)
compat = &sdata->vif.bss_conf.chandef;
compat = cfg80211_chandef_compatible(
&sdata->vif.bss_conf.chandef, compat);
if (!compat)
break;
}
return compat;
}
static const struct cfg80211_chan_def *
ieee80211_chanctx_combined_chandef(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx,
const struct cfg80211_chan_def *compat)
{
lockdep_assert_held(&local->chanctx_mtx);
compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat);
if (!compat)
return NULL;
compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat);
if (!compat)
return NULL;
return compat;
}
static bool
ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx,
const struct cfg80211_chan_def *def)
{
lockdep_assert_held(&local->chanctx_mtx);
if (ieee80211_chanctx_combined_chandef(local, ctx, def))
return true;
if (!list_empty(&ctx->reserved_vifs) &&
ieee80211_chanctx_reserved_chandef(local, ctx, def))
return true;
return false;
}
static struct ieee80211_chanctx *
ieee80211_find_reservation_chanctx(struct ieee80211_local *local,
const struct cfg80211_chan_def *chandef,
enum ieee80211_chanctx_mode mode)
{
struct ieee80211_chanctx *ctx;
lockdep_assert_held(&local->chanctx_mtx);
if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
return NULL;
list_for_each_entry(ctx, &local->chanctx_list, list) {
if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
continue;
if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
continue;
if (!ieee80211_chanctx_can_reserve_chandef(local, ctx,
chandef))
continue;
return ctx;
}
return NULL;
}
enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta)
{
switch (sta->bandwidth) {
case IEEE80211_STA_RX_BW_20:
if (sta->ht_cap.ht_supported)
return NL80211_CHAN_WIDTH_20;
else
return NL80211_CHAN_WIDTH_20_NOHT;
case IEEE80211_STA_RX_BW_40:
return NL80211_CHAN_WIDTH_40;
case IEEE80211_STA_RX_BW_80:
return NL80211_CHAN_WIDTH_80;
case IEEE80211_STA_RX_BW_160:
/*
* This applied for both 160 and 80+80. since we use
* the returned value to consider degradation of
* ctx->conf.min_def, we have to make sure to take
* the bigger one (NL80211_CHAN_WIDTH_160).
* Otherwise we might try degrading even when not
* needed, as the max required sta_bw returned (80+80)
* might be smaller than the configured bw (160).
*/
return NL80211_CHAN_WIDTH_160;
default:
WARN_ON(1);
return NL80211_CHAN_WIDTH_20;
}
}
static enum nl80211_chan_width
ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
{
enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
struct sta_info *sta;
rcu_read_lock();
list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
if (sdata != sta->sdata &&
!(sta->sdata->bss && sta->sdata->bss == sdata->bss))
continue;
if (!sta->uploaded || !test_sta_flag(sta, WLAN_STA_ASSOC))
continue;
max_bw = max(max_bw, ieee80211_get_sta_bw(&sta->sta));
}
rcu_read_unlock();
return max_bw;
}
static enum nl80211_chan_width
ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
struct ieee80211_chanctx_conf *conf)
{
struct ieee80211_sub_if_data *sdata;
enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
struct ieee80211_vif *vif = &sdata->vif;
enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
if (!ieee80211_sdata_running(sdata))
continue;
if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
continue;
switch (vif->type) {
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_AP_VLAN:
width = ieee80211_get_max_required_bw(sdata);
break;
case NL80211_IFTYPE_STATION:
/*
* The ap's sta->bandwidth is not set yet at this
* point, so take the width from the chandef, but
* account also for TDLS peers
*/
width = max(vif->bss_conf.chandef.width,
ieee80211_get_max_required_bw(sdata));
break;
case NL80211_IFTYPE_P2P_DEVICE:
case NL80211_IFTYPE_NAN:
continue;
case NL80211_IFTYPE_ADHOC:
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_OCB:
width = vif->bss_conf.chandef.width;
break;
case NL80211_IFTYPE_UNSPECIFIED:
case NUM_NL80211_IFTYPES:
case NL80211_IFTYPE_MONITOR:
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_P2P_GO:
WARN_ON_ONCE(1);
}
max_bw = max(max_bw, width);
}
/* use the configured bandwidth in case of monitor interface */
sdata = rcu_dereference(local->monitor_sdata);
if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf)
max_bw = max(max_bw, conf->def.width);
rcu_read_unlock();
return max_bw;
}
/*
* recalc the min required chan width of the channel context, which is
* the max of min required widths of all the interfaces bound to this
* channel context.
*/
void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
enum nl80211_chan_width max_bw;
struct cfg80211_chan_def min_def;
lockdep_assert_held(&local->chanctx_mtx);
/* don't optimize 5MHz, 10MHz, and radar_enabled confs */
if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
ctx->conf.radar_enabled) {
ctx->conf.min_def = ctx->conf.def;
return;
}
max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
/* downgrade chandef up to max_bw */
min_def = ctx->conf.def;
while (min_def.width > max_bw)
ieee80211_chandef_downgrade(&min_def);
if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
return;
ctx->conf.min_def = min_def;
if (!ctx->driver_present)
return;
drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH);
}
static void ieee80211_change_chanctx(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx,
const struct cfg80211_chan_def *chandef)
{
if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) {
ieee80211_recalc_chanctx_min_def(local, ctx);
return;
}
WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
ctx->conf.def = *chandef;
drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
ieee80211_recalc_chanctx_min_def(local, ctx);
if (!local->use_chanctx) {
local->_oper_chandef = *chandef;
ieee80211_hw_config(local, 0);
}
}
static struct ieee80211_chanctx *
ieee80211_find_chanctx(struct ieee80211_local *local,
const struct cfg80211_chan_def *chandef,
enum ieee80211_chanctx_mode mode)
{
struct ieee80211_chanctx *ctx;
lockdep_assert_held(&local->chanctx_mtx);
if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
return NULL;
list_for_each_entry(ctx, &local->chanctx_list, list) {
const struct cfg80211_chan_def *compat;
if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
continue;
if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
continue;
compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
if (!compat)
continue;
compat = ieee80211_chanctx_reserved_chandef(local, ctx,
compat);
if (!compat)
continue;
ieee80211_change_chanctx(local, ctx, compat);
return ctx;
}
return NULL;
}
bool ieee80211_is_radar_required(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
lockdep_assert_held(&local->mtx);
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (sdata->radar_required) {
rcu_read_unlock();
return true;
}
}
rcu_read_unlock();
return false;
}
static bool
ieee80211_chanctx_radar_required(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
struct ieee80211_chanctx_conf *conf = &ctx->conf;
struct ieee80211_sub_if_data *sdata;
bool required = false;
lockdep_assert_held(&local->chanctx_mtx);
lockdep_assert_held(&local->mtx);
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (!ieee80211_sdata_running(sdata))
continue;
if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
continue;
if (!sdata->radar_required)
continue;
required = true;
break;
}
rcu_read_unlock();
return required;
}
static struct ieee80211_chanctx *
ieee80211_alloc_chanctx(struct ieee80211_local *local,
const struct cfg80211_chan_def *chandef,
enum ieee80211_chanctx_mode mode)
{
struct ieee80211_chanctx *ctx;
lockdep_assert_held(&local->chanctx_mtx);
ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
if (!ctx)
return NULL;
INIT_LIST_HEAD(&ctx->assigned_vifs);
INIT_LIST_HEAD(&ctx->reserved_vifs);
ctx->conf.def = *chandef;
ctx->conf.rx_chains_static = 1;
ctx->conf.rx_chains_dynamic = 1;
ctx->mode = mode;
ctx->conf.radar_enabled = false;
ieee80211_recalc_chanctx_min_def(local, ctx);
return ctx;
}
static int ieee80211_add_chanctx(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
u32 changed;
int err;
lockdep_assert_held(&local->mtx);
lockdep_assert_held(&local->chanctx_mtx);
if (!local->use_chanctx)
local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
/* turn idle off *before* setting channel -- some drivers need that */
changed = ieee80211_idle_off(local);
if (changed)
ieee80211_hw_config(local, changed);
if (!local->use_chanctx) {
local->_oper_chandef = ctx->conf.def;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
} else {
err = drv_add_chanctx(local, ctx);
if (err) {
ieee80211_recalc_idle(local);
return err;
}
}
return 0;
}
static struct ieee80211_chanctx *
ieee80211_new_chanctx(struct ieee80211_local *local,
const struct cfg80211_chan_def *chandef,
enum ieee80211_chanctx_mode mode)
{
struct ieee80211_chanctx *ctx;
int err;
lockdep_assert_held(&local->mtx);
lockdep_assert_held(&local->chanctx_mtx);
ctx = ieee80211_alloc_chanctx(local, chandef, mode);
if (!ctx)
return ERR_PTR(-ENOMEM);
err = ieee80211_add_chanctx(local, ctx);
if (err) {
kfree(ctx);
return ERR_PTR(err);
}
list_add_rcu(&ctx->list, &local->chanctx_list);
return ctx;
}
static void ieee80211_del_chanctx(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
lockdep_assert_held(&local->chanctx_mtx);
if (!local->use_chanctx) {
struct cfg80211_chan_def *chandef = &local->_oper_chandef;
chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
chandef->center_freq1 = chandef->chan->center_freq;
chandef->center_freq2 = 0;
/* NOTE: Disabling radar is only valid here for
* single channel context. To be sure, check it ...
*/
WARN_ON(local->hw.conf.radar_enabled &&
!list_empty(&local->chanctx_list));
local->hw.conf.radar_enabled = false;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
} else {
drv_remove_chanctx(local, ctx);
}
ieee80211_recalc_idle(local);
}
static void ieee80211_free_chanctx(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
lockdep_assert_held(&local->chanctx_mtx);
WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
list_del_rcu(&ctx->list);
ieee80211_del_chanctx(local, ctx);
kfree_rcu(ctx, rcu_head);
}
void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
struct ieee80211_chanctx_conf *conf = &ctx->conf;
struct ieee80211_sub_if_data *sdata;
const struct cfg80211_chan_def *compat = NULL;
struct sta_info *sta;
lockdep_assert_held(&local->chanctx_mtx);
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (!ieee80211_sdata_running(sdata))
continue;
if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
continue;
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
continue;
if (!compat)
compat = &sdata->vif.bss_conf.chandef;
compat = cfg80211_chandef_compatible(
&sdata->vif.bss_conf.chandef, compat);
if (WARN_ON_ONCE(!compat))
break;
}
/* TDLS peers can sometimes affect the chandef width */
list_for_each_entry_rcu(sta, &local->sta_list, list) {
if (!sta->uploaded ||
!test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
!test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
!sta->tdls_chandef.chan)
continue;
compat = cfg80211_chandef_compatible(&sta->tdls_chandef,
compat);
if (WARN_ON_ONCE(!compat))
break;
}
rcu_read_unlock();
if (!compat)
return;
ieee80211_change_chanctx(local, ctx, compat);
}
static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
struct ieee80211_chanctx *chanctx)
{
bool radar_enabled;
lockdep_assert_held(&local->chanctx_mtx);
/* for ieee80211_is_radar_required */
lockdep_assert_held(&local->mtx);
radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
if (radar_enabled == chanctx->conf.radar_enabled)
return;
chanctx->conf.radar_enabled = radar_enabled;
if (!local->use_chanctx) {
local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
}
drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
}
static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
struct ieee80211_chanctx *new_ctx)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx_conf *conf;
struct ieee80211_chanctx *curr_ctx = NULL;
int ret = 0;
if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
return -ENOTSUPP;
conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
lockdep_is_held(&local->chanctx_mtx));
if (conf) {
curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
drv_unassign_vif_chanctx(local, sdata, curr_ctx);
conf = NULL;
list_del(&sdata->assigned_chanctx_list);
}
if (new_ctx) {
ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
if (ret)
goto out;
conf = &new_ctx->conf;
list_add(&sdata->assigned_chanctx_list,
&new_ctx->assigned_vifs);
}
out:
rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
sdata->vif.bss_conf.idle = !conf;
if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
ieee80211_recalc_chanctx_chantype(local, curr_ctx);
ieee80211_recalc_smps_chanctx(local, curr_ctx);
ieee80211_recalc_radar_chanctx(local, curr_ctx);
ieee80211_recalc_chanctx_min_def(local, curr_ctx);
}
if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
ieee80211_recalc_txpower(sdata, false);
ieee80211_recalc_chanctx_min_def(local, new_ctx);
}
if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
sdata->vif.type != NL80211_IFTYPE_MONITOR)
ieee80211_bss_info_change_notify(sdata,
BSS_CHANGED_IDLE);
ieee80211_check_fast_xmit_iface(sdata);
return ret;
}
void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
struct ieee80211_chanctx *chanctx)
{
struct ieee80211_sub_if_data *sdata;
u8 rx_chains_static, rx_chains_dynamic;
lockdep_assert_held(&local->chanctx_mtx);
rx_chains_static = 1;
rx_chains_dynamic = 1;
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
u8 needed_static, needed_dynamic;
if (!ieee80211_sdata_running(sdata))
continue;
if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
&chanctx->conf)
continue;
switch (sdata->vif.type) {
case NL80211_IFTYPE_P2P_DEVICE:
case NL80211_IFTYPE_NAN:
continue;
case NL80211_IFTYPE_STATION:
if (!sdata->u.mgd.associated)
continue;
break;
case NL80211_IFTYPE_AP_VLAN:
continue;
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_ADHOC:
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_OCB:
break;
default:
WARN_ON_ONCE(1);
}
switch (sdata->smps_mode) {
default:
WARN_ONCE(1, "Invalid SMPS mode %d\n",
sdata->smps_mode);
/* fall through */
case IEEE80211_SMPS_OFF:
needed_static = sdata->needed_rx_chains;
needed_dynamic = sdata->needed_rx_chains;
break;
case IEEE80211_SMPS_DYNAMIC:
needed_static = 1;
needed_dynamic = sdata->needed_rx_chains;
break;
case IEEE80211_SMPS_STATIC:
needed_static = 1;
needed_dynamic = 1;
break;
}
rx_chains_static = max(rx_chains_static, needed_static);
rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
}
/* Disable SMPS for the monitor interface */
sdata = rcu_dereference(local->monitor_sdata);
if (sdata &&
rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
rx_chains_dynamic = rx_chains_static = local->rx_chains;
rcu_read_unlock();
if (!local->use_chanctx) {
if (rx_chains_static > 1)
local->smps_mode = IEEE80211_SMPS_OFF;
else if (rx_chains_dynamic > 1)
local->smps_mode = IEEE80211_SMPS_DYNAMIC;
else
local->smps_mode = IEEE80211_SMPS_STATIC;
ieee80211_hw_config(local, 0);
}
if (rx_chains_static == chanctx->conf.rx_chains_static &&
rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
return;
chanctx->conf.rx_chains_static = rx_chains_static;
chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
}
static void
__ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
bool clear)
{
struct ieee80211_local *local __maybe_unused = sdata->local;
struct ieee80211_sub_if_data *vlan;
struct ieee80211_chanctx_conf *conf;
if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
return;
lockdep_assert_held(&local->mtx);
/* Check that conf exists, even when clearing this function
* must be called with the AP's channel context still there
* as it would otherwise cause VLANs to have an invalid
* channel context pointer for a while, possibly pointing
* to a channel context that has already been freed.
*/
conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
lockdep_is_held(&local->chanctx_mtx));
WARN_ON(!conf);
if (clear)
conf = NULL;
list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
}
void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
bool clear)
{
struct ieee80211_local *local = sdata->local;
mutex_lock(&local->chanctx_mtx);
__ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
mutex_unlock(&local->chanctx_mtx);
}
int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
lockdep_assert_held(&sdata->local->chanctx_mtx);
if (WARN_ON(!ctx))
return -EINVAL;
list_del(&sdata->reserved_chanctx_list);
sdata->reserved_chanctx = NULL;
if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
if (WARN_ON(!ctx->replace_ctx))
return -EINVAL;
WARN_ON(ctx->replace_ctx->replace_state !=
IEEE80211_CHANCTX_WILL_BE_REPLACED);
WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
ctx->replace_ctx->replace_ctx = NULL;
ctx->replace_ctx->replace_state =
IEEE80211_CHANCTX_REPLACE_NONE;
list_del_rcu(&ctx->list);
kfree_rcu(ctx, rcu_head);
} else {
ieee80211_free_chanctx(sdata->local, ctx);
}
}
return 0;
}
int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
const struct cfg80211_chan_def *chandef,
enum ieee80211_chanctx_mode mode,
bool radar_required)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
lockdep_assert_held(&local->chanctx_mtx);
curr_ctx = ieee80211_vif_get_chanctx(sdata);
if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
return -ENOTSUPP;
new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
if (!new_ctx) {
if (ieee80211_can_create_new_chanctx(local)) {
new_ctx = ieee80211_new_chanctx(local, chandef, mode);
if (IS_ERR(new_ctx))
return PTR_ERR(new_ctx);
} else {
if (!curr_ctx ||
(curr_ctx->replace_state ==
IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
!list_empty(&curr_ctx->reserved_vifs)) {
/*
* Another vif already requested this context
* for a reservation. Find another one hoping
* all vifs assigned to it will also switch
* soon enough.
*
* TODO: This needs a little more work as some
* cases (more than 2 chanctx capable devices)
* may fail which could otherwise succeed
* provided some channel context juggling was
* performed.
*
* Consider ctx1..3, vif1..6, each ctx has 2
* vifs. vif1 and vif2 from ctx1 request new
* different chandefs starting 2 in-place
* reserations with ctx4 and ctx5 replacing
* ctx1 and ctx2 respectively. Next vif5 and
* vif6 from ctx3 reserve ctx4. If vif3 and
* vif4 remain on ctx2 as they are then this
* fails unless `replace_ctx` from ctx5 is
* replaced with ctx3.
*/
list_for_each_entry(ctx, &local->chanctx_list,
list) {
if (ctx->replace_state !=
IEEE80211_CHANCTX_REPLACE_NONE)
continue;
if (!list_empty(&ctx->reserved_vifs))
continue;
curr_ctx = ctx;
break;
}
}
/*
* If that's true then all available contexts already
* have reservations and cannot be used.
*/
if (!curr_ctx ||
(curr_ctx->replace_state ==
IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
!list_empty(&curr_ctx->reserved_vifs))
return -EBUSY;
new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
if (!new_ctx)
return -ENOMEM;
new_ctx->replace_ctx = curr_ctx;
new_ctx->replace_state =
IEEE80211_CHANCTX_REPLACES_OTHER;
curr_ctx->replace_ctx = new_ctx;
curr_ctx->replace_state =
IEEE80211_CHANCTX_WILL_BE_REPLACED;
list_add_rcu(&new_ctx->list, &local->chanctx_list);
}
}
list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
sdata->reserved_chanctx = new_ctx;
sdata->reserved_chandef = *chandef;
sdata->reserved_radar_required = radar_required;
sdata->reserved_ready = false;
return 0;
}
static void
ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
{
switch (sdata->vif.type) {
case NL80211_IFTYPE_ADHOC:
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_OCB:
ieee80211_queue_work(&sdata->local->hw,
&sdata->csa_finalize_work);
break;
case NL80211_IFTYPE_STATION:
ieee80211_queue_work(&sdata->local->hw,
&sdata->u.mgd.chswitch_work);
break;
case NL80211_IFTYPE_UNSPECIFIED:
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_MONITOR:
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_P2P_GO:
case NL80211_IFTYPE_P2P_DEVICE:
case NL80211_IFTYPE_NAN:
case NUM_NL80211_IFTYPES:
WARN_ON(1);
break;
}
}
static void
ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata,
const struct cfg80211_chan_def *chandef)
{
struct ieee80211_sub_if_data *vlan;