540 lines
13 KiB
C
540 lines
13 KiB
C
/*
|
|
* 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 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))
|
|
return;
|
|
|
|
WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
|
|
|
|
ctx->conf.def = *chandef;
|
|
drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
|
|
|
|
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->mode == IEEE80211_CHANCTX_EXCLUSIVE)
|
|
continue;
|
|
|
|
compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
|
|
if (!compat)
|
|
continue;
|
|
|
|
ieee80211_change_chanctx(local, ctx, compat);
|
|
|
|
return ctx;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static bool ieee80211_is_radar_required(struct ieee80211_local *local)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata;
|
|
|
|
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 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;
|
|
u32 changed;
|
|
int err;
|
|
|
|
lockdep_assert_held(&local->chanctx_mtx);
|
|
|
|
ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
|
|
if (!ctx)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ctx->conf.def = *chandef;
|
|
ctx->conf.rx_chains_static = 1;
|
|
ctx->conf.rx_chains_dynamic = 1;
|
|
ctx->mode = mode;
|
|
ctx->conf.radar_enabled = ieee80211_is_radar_required(local);
|
|
if (!local->use_chanctx)
|
|
local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
|
|
|
|
/* acquire mutex to prevent idle from changing */
|
|
mutex_lock(&local->mtx);
|
|
/* 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 = *chandef;
|
|
ieee80211_hw_config(local, 0);
|
|
} else {
|
|
err = drv_add_chanctx(local, ctx);
|
|
if (err) {
|
|
kfree(ctx);
|
|
ctx = ERR_PTR(err);
|
|
|
|
ieee80211_recalc_idle(local);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* and keep the mutex held until the new chanctx is on the list */
|
|
list_add_rcu(&ctx->list, &local->chanctx_list);
|
|
|
|
out:
|
|
mutex_unlock(&local->mtx);
|
|
|
|
return ctx;
|
|
}
|
|
|
|
static void ieee80211_free_chanctx(struct ieee80211_local *local,
|
|
struct ieee80211_chanctx *ctx)
|
|
{
|
|
bool check_single_channel = false;
|
|
lockdep_assert_held(&local->chanctx_mtx);
|
|
|
|
WARN_ON_ONCE(ctx->refcount != 0);
|
|
|
|
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 ...
|
|
*/
|
|
if (local->hw.conf.radar_enabled)
|
|
check_single_channel = true;
|
|
local->hw.conf.radar_enabled = false;
|
|
|
|
ieee80211_hw_config(local, 0);
|
|
} else {
|
|
drv_remove_chanctx(local, ctx);
|
|
}
|
|
|
|
list_del_rcu(&ctx->list);
|
|
kfree_rcu(ctx, rcu_head);
|
|
|
|
/* throw a warning if this wasn't the only channel context. */
|
|
WARN_ON(check_single_channel && !list_empty(&local->chanctx_list));
|
|
|
|
mutex_lock(&local->mtx);
|
|
ieee80211_recalc_idle(local);
|
|
mutex_unlock(&local->mtx);
|
|
}
|
|
|
|
static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
|
|
struct ieee80211_chanctx *ctx)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
int ret;
|
|
|
|
lockdep_assert_held(&local->chanctx_mtx);
|
|
|
|
ret = drv_assign_vif_chanctx(local, sdata, ctx);
|
|
if (ret)
|
|
return ret;
|
|
|
|
rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
|
|
ctx->refcount++;
|
|
|
|
ieee80211_recalc_txpower(sdata);
|
|
sdata->vif.bss_conf.idle = false;
|
|
|
|
if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
|
|
sdata->vif.type != NL80211_IFTYPE_MONITOR)
|
|
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static 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;
|
|
|
|
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 (!compat)
|
|
compat = &sdata->vif.bss_conf.chandef;
|
|
|
|
compat = cfg80211_chandef_compatible(
|
|
&sdata->vif.bss_conf.chandef, compat);
|
|
if (!compat)
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (WARN_ON_ONCE(!compat))
|
|
return;
|
|
|
|
ieee80211_change_chanctx(local, ctx, compat);
|
|
}
|
|
|
|
static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
|
|
struct ieee80211_chanctx *ctx)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
|
|
lockdep_assert_held(&local->chanctx_mtx);
|
|
|
|
ctx->refcount--;
|
|
rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
|
|
|
|
sdata->vif.bss_conf.idle = true;
|
|
|
|
if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
|
|
sdata->vif.type != NL80211_IFTYPE_MONITOR)
|
|
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
|
|
|
|
drv_unassign_vif_chanctx(local, sdata, ctx);
|
|
|
|
if (ctx->refcount > 0) {
|
|
ieee80211_recalc_chanctx_chantype(sdata->local, ctx);
|
|
ieee80211_recalc_smps_chanctx(local, ctx);
|
|
ieee80211_recalc_radar_chanctx(local, ctx);
|
|
}
|
|
}
|
|
|
|
static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct ieee80211_chanctx_conf *conf;
|
|
struct ieee80211_chanctx *ctx;
|
|
|
|
lockdep_assert_held(&local->chanctx_mtx);
|
|
|
|
conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
|
|
lockdep_is_held(&local->chanctx_mtx));
|
|
if (!conf)
|
|
return;
|
|
|
|
ctx = container_of(conf, struct ieee80211_chanctx, conf);
|
|
|
|
ieee80211_unassign_vif_chanctx(sdata, ctx);
|
|
if (ctx->refcount == 0)
|
|
ieee80211_free_chanctx(local, ctx);
|
|
}
|
|
|
|
void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
|
|
struct ieee80211_chanctx *chanctx)
|
|
{
|
|
bool radar_enabled;
|
|
|
|
lockdep_assert_held(&local->chanctx_mtx);
|
|
|
|
radar_enabled = ieee80211_is_radar_required(local);
|
|
|
|
if (radar_enabled == chanctx->conf.radar_enabled)
|
|
return;
|
|
|
|
chanctx->conf.radar_enabled = radar_enabled;
|
|
local->radar_detect_enabled = chanctx->conf.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);
|
|
}
|
|
|
|
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:
|
|
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:
|
|
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);
|
|
}
|
|
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);
|
|
}
|
|
|
|
int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
|
|
const struct cfg80211_chan_def *chandef,
|
|
enum ieee80211_chanctx_mode mode)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct ieee80211_chanctx *ctx;
|
|
int ret;
|
|
|
|
WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
|
|
|
|
mutex_lock(&local->chanctx_mtx);
|
|
__ieee80211_vif_release_channel(sdata);
|
|
|
|
ctx = ieee80211_find_chanctx(local, chandef, mode);
|
|
if (!ctx)
|
|
ctx = ieee80211_new_chanctx(local, chandef, mode);
|
|
if (IS_ERR(ctx)) {
|
|
ret = PTR_ERR(ctx);
|
|
goto out;
|
|
}
|
|
|
|
sdata->vif.bss_conf.chandef = *chandef;
|
|
|
|
ret = ieee80211_assign_vif_chanctx(sdata, ctx);
|
|
if (ret) {
|
|
/* if assign fails refcount stays the same */
|
|
if (ctx->refcount == 0)
|
|
ieee80211_free_chanctx(local, ctx);
|
|
goto out;
|
|
}
|
|
|
|
ieee80211_recalc_smps_chanctx(local, ctx);
|
|
ieee80211_recalc_radar_chanctx(local, ctx);
|
|
out:
|
|
mutex_unlock(&local->chanctx_mtx);
|
|
return ret;
|
|
}
|
|
|
|
int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
|
|
const struct cfg80211_chan_def *chandef,
|
|
u32 *changed)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct ieee80211_chanctx_conf *conf;
|
|
struct ieee80211_chanctx *ctx;
|
|
int ret;
|
|
|
|
if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
|
|
IEEE80211_CHAN_DISABLED))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&local->chanctx_mtx);
|
|
if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
|
|
sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
|
|
lockdep_is_held(&local->chanctx_mtx));
|
|
if (!conf) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
ctx = container_of(conf, struct ieee80211_chanctx, conf);
|
|
if (!cfg80211_chandef_compatible(&conf->def, chandef)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
sdata->vif.bss_conf.chandef = *chandef;
|
|
|
|
ieee80211_recalc_chanctx_chantype(local, ctx);
|
|
|
|
*changed |= BSS_CHANGED_BANDWIDTH;
|
|
ret = 0;
|
|
out:
|
|
mutex_unlock(&local->chanctx_mtx);
|
|
return ret;
|
|
}
|
|
|
|
void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
|
|
|
|
mutex_lock(&sdata->local->chanctx_mtx);
|
|
__ieee80211_vif_release_channel(sdata);
|
|
mutex_unlock(&sdata->local->chanctx_mtx);
|
|
}
|
|
|
|
void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct ieee80211_sub_if_data *ap;
|
|
struct ieee80211_chanctx_conf *conf;
|
|
|
|
if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
|
|
return;
|
|
|
|
ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
|
|
|
|
mutex_lock(&local->chanctx_mtx);
|
|
|
|
conf = rcu_dereference_protected(ap->vif.chanctx_conf,
|
|
lockdep_is_held(&local->chanctx_mtx));
|
|
rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
|
|
mutex_unlock(&local->chanctx_mtx);
|
|
}
|
|
|
|
void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
|
|
bool clear)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct ieee80211_sub_if_data *vlan;
|
|
struct ieee80211_chanctx_conf *conf;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
|
|
return;
|
|
|
|
mutex_lock(&local->chanctx_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);
|
|
|
|
mutex_unlock(&local->chanctx_mtx);
|
|
}
|
|
|
|
void ieee80211_iter_chan_contexts_atomic(
|
|
struct ieee80211_hw *hw,
|
|
void (*iter)(struct ieee80211_hw *hw,
|
|
struct ieee80211_chanctx_conf *chanctx_conf,
|
|
void *data),
|
|
void *iter_data)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
struct ieee80211_chanctx *ctx;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
|
|
if (ctx->driver_present)
|
|
iter(hw, &ctx->conf, iter_data);
|
|
rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
|