path: root/net/mac80211/chan.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 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 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