541 lines
13 KiB
C
541 lines
13 KiB
C
/*
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* mac80211 - channel management
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*/
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#include <linux/nl80211.h>
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#include <linux/export.h>
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#include <linux/rtnetlink.h>
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#include <net/cfg80211.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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static void ieee80211_change_chanctx(struct ieee80211_local *local,
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struct ieee80211_chanctx *ctx,
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const struct cfg80211_chan_def *chandef)
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{
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if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
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return;
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WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
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ctx->conf.def = *chandef;
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drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
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if (!local->use_chanctx) {
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local->_oper_chandef = *chandef;
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ieee80211_hw_config(local, 0);
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}
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}
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static struct ieee80211_chanctx *
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ieee80211_find_chanctx(struct ieee80211_local *local,
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const struct cfg80211_chan_def *chandef,
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enum ieee80211_chanctx_mode mode)
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{
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struct ieee80211_chanctx *ctx;
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lockdep_assert_held(&local->chanctx_mtx);
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if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
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return NULL;
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list_for_each_entry(ctx, &local->chanctx_list, list) {
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const struct cfg80211_chan_def *compat;
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if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
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continue;
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compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
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if (!compat)
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continue;
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ieee80211_change_chanctx(local, ctx, compat);
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return ctx;
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}
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return NULL;
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}
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static bool ieee80211_is_radar_required(struct ieee80211_local *local)
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{
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struct ieee80211_sub_if_data *sdata;
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rcu_read_lock();
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list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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if (sdata->radar_required) {
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rcu_read_unlock();
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return true;
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}
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}
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rcu_read_unlock();
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return false;
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}
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static struct ieee80211_chanctx *
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ieee80211_new_chanctx(struct ieee80211_local *local,
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const struct cfg80211_chan_def *chandef,
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enum ieee80211_chanctx_mode mode)
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{
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struct ieee80211_chanctx *ctx;
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u32 changed;
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int err;
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lockdep_assert_held(&local->chanctx_mtx);
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ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
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if (!ctx)
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return ERR_PTR(-ENOMEM);
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ctx->conf.def = *chandef;
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ctx->conf.rx_chains_static = 1;
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ctx->conf.rx_chains_dynamic = 1;
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ctx->mode = mode;
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ctx->conf.radar_enabled = ieee80211_is_radar_required(local);
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if (!local->use_chanctx)
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local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
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/* acquire mutex to prevent idle from changing */
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mutex_lock(&local->mtx);
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/* turn idle off *before* setting channel -- some drivers need that */
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changed = ieee80211_idle_off(local);
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if (changed)
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ieee80211_hw_config(local, changed);
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if (!local->use_chanctx) {
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local->_oper_chandef = *chandef;
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ieee80211_hw_config(local, 0);
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} else {
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err = drv_add_chanctx(local, ctx);
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if (err) {
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kfree(ctx);
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ctx = ERR_PTR(err);
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ieee80211_recalc_idle(local);
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goto out;
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}
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}
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/* and keep the mutex held until the new chanctx is on the list */
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list_add_rcu(&ctx->list, &local->chanctx_list);
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out:
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mutex_unlock(&local->mtx);
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return ctx;
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}
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static void ieee80211_free_chanctx(struct ieee80211_local *local,
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struct ieee80211_chanctx *ctx)
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{
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bool check_single_channel = false;
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lockdep_assert_held(&local->chanctx_mtx);
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WARN_ON_ONCE(ctx->refcount != 0);
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if (!local->use_chanctx) {
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struct cfg80211_chan_def *chandef = &local->_oper_chandef;
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chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
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chandef->center_freq1 = chandef->chan->center_freq;
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chandef->center_freq2 = 0;
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/* NOTE: Disabling radar is only valid here for
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* single channel context. To be sure, check it ...
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*/
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if (local->hw.conf.radar_enabled)
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check_single_channel = true;
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local->hw.conf.radar_enabled = false;
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ieee80211_hw_config(local, 0);
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} else {
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drv_remove_chanctx(local, ctx);
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}
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list_del_rcu(&ctx->list);
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kfree_rcu(ctx, rcu_head);
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/* throw a warning if this wasn't the only channel context. */
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WARN_ON(check_single_channel && !list_empty(&local->chanctx_list));
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mutex_lock(&local->mtx);
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ieee80211_recalc_idle(local);
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mutex_unlock(&local->mtx);
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}
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static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_chanctx *ctx)
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{
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struct ieee80211_local *local = sdata->local;
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int ret;
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lockdep_assert_held(&local->chanctx_mtx);
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ret = drv_assign_vif_chanctx(local, sdata, ctx);
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if (ret)
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return ret;
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rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
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ctx->refcount++;
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ieee80211_recalc_txpower(sdata);
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sdata->vif.bss_conf.idle = false;
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if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
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sdata->vif.type != NL80211_IFTYPE_MONITOR)
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ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
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return 0;
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}
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static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
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struct ieee80211_chanctx *ctx)
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{
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struct ieee80211_chanctx_conf *conf = &ctx->conf;
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struct ieee80211_sub_if_data *sdata;
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const struct cfg80211_chan_def *compat = NULL;
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lockdep_assert_held(&local->chanctx_mtx);
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rcu_read_lock();
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list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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if (!ieee80211_sdata_running(sdata))
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continue;
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if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
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continue;
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if (!compat)
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compat = &sdata->vif.bss_conf.chandef;
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compat = cfg80211_chandef_compatible(
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&sdata->vif.bss_conf.chandef, compat);
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if (!compat)
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break;
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}
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rcu_read_unlock();
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if (WARN_ON_ONCE(!compat))
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return;
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ieee80211_change_chanctx(local, ctx, compat);
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}
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static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_chanctx *ctx)
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{
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struct ieee80211_local *local = sdata->local;
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lockdep_assert_held(&local->chanctx_mtx);
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ctx->refcount--;
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rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
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sdata->vif.bss_conf.idle = true;
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if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
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sdata->vif.type != NL80211_IFTYPE_MONITOR)
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ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
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drv_unassign_vif_chanctx(local, sdata, ctx);
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if (ctx->refcount > 0) {
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ieee80211_recalc_chanctx_chantype(sdata->local, ctx);
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ieee80211_recalc_smps_chanctx(local, ctx);
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ieee80211_recalc_radar_chanctx(local, ctx);
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}
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}
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static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_chanctx_conf *conf;
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struct ieee80211_chanctx *ctx;
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lockdep_assert_held(&local->chanctx_mtx);
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conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
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lockdep_is_held(&local->chanctx_mtx));
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if (!conf)
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return;
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ctx = container_of(conf, struct ieee80211_chanctx, conf);
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ieee80211_unassign_vif_chanctx(sdata, ctx);
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if (ctx->refcount == 0)
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ieee80211_free_chanctx(local, ctx);
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}
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void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
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struct ieee80211_chanctx *chanctx)
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{
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bool radar_enabled;
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lockdep_assert_held(&local->chanctx_mtx);
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radar_enabled = ieee80211_is_radar_required(local);
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if (radar_enabled == chanctx->conf.radar_enabled)
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return;
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chanctx->conf.radar_enabled = radar_enabled;
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local->radar_detect_enabled = chanctx->conf.radar_enabled;
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if (!local->use_chanctx) {
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local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
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ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
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}
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drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
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}
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void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
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struct ieee80211_chanctx *chanctx)
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{
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struct ieee80211_sub_if_data *sdata;
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u8 rx_chains_static, rx_chains_dynamic;
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lockdep_assert_held(&local->chanctx_mtx);
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rx_chains_static = 1;
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rx_chains_dynamic = 1;
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rcu_read_lock();
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list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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u8 needed_static, needed_dynamic;
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if (!ieee80211_sdata_running(sdata))
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continue;
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if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
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&chanctx->conf)
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continue;
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switch (sdata->vif.type) {
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case NL80211_IFTYPE_P2P_DEVICE:
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continue;
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case NL80211_IFTYPE_STATION:
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if (!sdata->u.mgd.associated)
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continue;
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break;
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case NL80211_IFTYPE_AP_VLAN:
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continue;
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case NL80211_IFTYPE_AP:
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case NL80211_IFTYPE_ADHOC:
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case NL80211_IFTYPE_WDS:
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case NL80211_IFTYPE_MESH_POINT:
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break;
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default:
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WARN_ON_ONCE(1);
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}
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switch (sdata->smps_mode) {
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default:
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WARN_ONCE(1, "Invalid SMPS mode %d\n",
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sdata->smps_mode);
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/* fall through */
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case IEEE80211_SMPS_OFF:
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needed_static = sdata->needed_rx_chains;
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needed_dynamic = sdata->needed_rx_chains;
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break;
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case IEEE80211_SMPS_DYNAMIC:
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needed_static = 1;
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needed_dynamic = sdata->needed_rx_chains;
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break;
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case IEEE80211_SMPS_STATIC:
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needed_static = 1;
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needed_dynamic = 1;
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break;
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}
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rx_chains_static = max(rx_chains_static, needed_static);
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rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
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}
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rcu_read_unlock();
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if (!local->use_chanctx) {
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if (rx_chains_static > 1)
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local->smps_mode = IEEE80211_SMPS_OFF;
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else if (rx_chains_dynamic > 1)
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local->smps_mode = IEEE80211_SMPS_DYNAMIC;
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else
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local->smps_mode = IEEE80211_SMPS_STATIC;
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ieee80211_hw_config(local, 0);
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}
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if (rx_chains_static == chanctx->conf.rx_chains_static &&
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rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
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return;
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chanctx->conf.rx_chains_static = rx_chains_static;
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chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
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drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
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}
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int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
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const struct cfg80211_chan_def *chandef,
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enum ieee80211_chanctx_mode mode)
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{
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_chanctx *ctx;
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int ret;
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WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
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mutex_lock(&local->chanctx_mtx);
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__ieee80211_vif_release_channel(sdata);
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ctx = ieee80211_find_chanctx(local, chandef, mode);
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if (!ctx)
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ctx = ieee80211_new_chanctx(local, chandef, mode);
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if (IS_ERR(ctx)) {
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ret = PTR_ERR(ctx);
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goto out;
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}
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sdata->vif.bss_conf.chandef = *chandef;
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ret = ieee80211_assign_vif_chanctx(sdata, ctx);
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if (ret) {
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/* if assign fails refcount stays the same */
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if (ctx->refcount == 0)
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ieee80211_free_chanctx(local, ctx);
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goto out;
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}
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ieee80211_recalc_smps_chanctx(local, ctx);
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ieee80211_recalc_radar_chanctx(local, ctx);
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out:
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mutex_unlock(&local->chanctx_mtx);
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return ret;
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}
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|
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int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
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const struct cfg80211_chan_def *chandef,
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u32 *changed)
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{
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_chanctx_conf *conf;
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struct ieee80211_chanctx *ctx;
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int ret;
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|
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if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
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IEEE80211_CHAN_DISABLED))
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return -EINVAL;
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mutex_lock(&local->chanctx_mtx);
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if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
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ret = 0;
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goto out;
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}
|
|
|
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if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
|
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sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
|
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ret = -EINVAL;
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goto out;
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}
|
|
|
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conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
|
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lockdep_is_held(&local->chanctx_mtx));
|
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if (!conf) {
|
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ret = -EINVAL;
|
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goto out;
|
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}
|
|
|
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ctx = container_of(conf, struct ieee80211_chanctx, conf);
|
|
if (!cfg80211_chandef_compatible(&conf->def, chandef)) {
|
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ret = -EINVAL;
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goto out;
|
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}
|
|
|
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sdata->vif.bss_conf.chandef = *chandef;
|
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|
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ieee80211_recalc_chanctx_chantype(local, ctx);
|
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|
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*changed |= BSS_CHANGED_BANDWIDTH;
|
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ret = 0;
|
|
out:
|
|
mutex_unlock(&local->chanctx_mtx);
|
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return ret;
|
|
}
|
|
|
|
void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
|
|
|
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mutex_lock(&sdata->local->chanctx_mtx);
|
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__ieee80211_vif_release_channel(sdata);
|
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mutex_unlock(&sdata->local->chanctx_mtx);
|
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}
|
|
|
|
void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
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struct ieee80211_sub_if_data *ap;
|
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struct ieee80211_chanctx_conf *conf;
|
|
|
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if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
|
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return;
|
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|
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ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
|
|
|
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mutex_lock(&local->chanctx_mtx);
|
|
|
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conf = rcu_dereference_protected(ap->vif.chanctx_conf,
|
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lockdep_is_held(&local->chanctx_mtx));
|
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rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
|
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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);
|