Commit c0f17eb9 authored by Chun-Yeow Yeoh's avatar Chun-Yeow Yeoh Committed by Johannes Berg
Browse files

mac80211: refactor the parsing of chan switch ie 



Refactor the channel switch IE parsing to reduce the number
of function parameters.

Signed-off-by: default avatarChun-Yeow Yeoh <yeohchunyeow@cozybit.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 06be6b14

net/mac80211/ibss.c

+7 −6
Original line number Diff line number Diff line
@@ -836,13 +836,13 @@ ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 
				  bool beacon)

{

	struct cfg80211_csa_settings params;

	struct ieee80211_csa_ie csa_ie;

	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;

	struct ieee80211_chanctx_conf *chanctx_conf;

	struct ieee80211_chanctx *chanctx;

	enum nl80211_channel_type ch_type;

	int err, num_chanctx;

	u32 sta_flags;

	u8 mode;



	if (sdata->vif.csa_active)

		return true;
@@ -865,12 +865,10 @@ ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 
	}



	memset(&params, 0, sizeof(params));

	memset(&csa_ie, 0, sizeof(csa_ie));

	err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon,

					   ifibss->chandef.chan->band,

					   sta_flags, ifibss->bssid,

					   &params.count, &mode,

					   &params.chandef);



					   sta_flags, ifibss->bssid, &csa_ie);

	/* can't switch to destination channel, fail */

	if (err < 0)

		goto disconnect;
@@ -879,6 +877,9 @@ ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 
	if (err)

		return false;



	params.count = csa_ie.count;

	params.chandef = csa_ie.chandef;



	if (ifibss->chandef.chan->band != params.chandef.chan->band)

		goto disconnect;
@@ -965,7 +966,7 @@ ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 
		 "received channel switch announcement to go to channel %d MHz\n",

		 params.chandef.chan->center_freq);



	params.block_tx = !!mode;

	params.block_tx = !!csa_ie.mode;



	ieee80211_ibss_csa_beacon(sdata, &params);

	sdata->csa_radar_required = params.radar_required;

net/mac80211/ieee80211_i.h

+12 −5
Original line number Diff line number Diff line
@@ -1208,6 +1208,14 @@ struct ieee80211_ra_tid { 
	u16 tid;

};



/* this struct holds the value parsing from channel switch IE  */

struct ieee80211_csa_ie {

	struct cfg80211_chan_def chandef;

	u8 mode;

	u8 count;

	u8 ttl;

};



/* Parsed Information Elements */

struct ieee802_11_elems {

	const u8 *ie_start;
@@ -1505,17 +1513,16 @@ void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata, 
 *	%IEEE80211_STA_DISABLE_HT, %IEEE80211_STA_DISABLE_VHT,

 *	%IEEE80211_STA_DISABLE_40MHZ, %IEEE80211_STA_DISABLE_80P80MHZ,

 *	%IEEE80211_STA_DISABLE_160MHZ.

 * @count: to be filled with the counter until the switch (on success only)

 * @bssid: the currently connected bssid (for reporting)

 * @mode: to be filled with CSA mode (on success only)

 * @new_chandef: to be filled with destination chandef (on success only)

 * @csa_ie: parsed 802.11 csa elements on count, mode, chandef and mesh ttl.

	All of them will be filled with if success only.

 * Return: 0 on success, <0 on error and >0 if there is nothing to parse.

 */

int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,

				 struct ieee802_11_elems *elems, bool beacon,

				 enum ieee80211_band current_band,

				 u32 sta_flags, u8 *bssid, u8 *count, u8 *mode,

				 struct cfg80211_chan_def *new_chandef);

				 u32 sta_flags, u8 *bssid,

				 struct ieee80211_csa_ie *csa_ie);



/* Suspend/resume and hw reconfiguration */

int ieee80211_reconfig(struct ieee80211_local *local);

net/mac80211/mlme.c

+15 −17
Original line number Diff line number Diff line
@@ -958,9 +958,7 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 
	struct cfg80211_bss *cbss = ifmgd->associated;

	struct ieee80211_chanctx *chanctx;

	enum ieee80211_band current_band;

	u8 count;

	u8 mode;

	struct cfg80211_chan_def new_chandef = {};

	struct ieee80211_csa_ie csa_ie;

	int res;



	sdata_assert_lock(sdata);
@@ -976,24 +974,24 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 
		return;



	current_band = cbss->channel->band;

	memset(&csa_ie, 0, sizeof(csa_ie));

	res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band,

					   ifmgd->flags,

					   ifmgd->associated->bssid, &count,

					   &mode, &new_chandef);

					   ifmgd->associated->bssid, &csa_ie);

	if (res	< 0)

		ieee80211_queue_work(&local->hw,

				     &ifmgd->csa_connection_drop_work);

	if (res)

		return;



	if (!cfg80211_chandef_usable(local->hw.wiphy, &new_chandef,

	if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,

				     IEEE80211_CHAN_DISABLED)) {

		sdata_info(sdata,

			   "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",

			   ifmgd->associated->bssid,

			   new_chandef.chan->center_freq,

			   new_chandef.width, new_chandef.center_freq1,

			   new_chandef.center_freq2);

			   csa_ie.chandef.chan->center_freq,

			   csa_ie.chandef.width, csa_ie.chandef.center_freq1,

			   csa_ie.chandef.center_freq2);

		ieee80211_queue_work(&local->hw,

				     &ifmgd->csa_connection_drop_work);

		return;
@@ -1037,9 +1035,9 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 
	}

	mutex_unlock(&local->chanctx_mtx);



	local->csa_chandef = new_chandef;

	local->csa_chandef = csa_ie.chandef;



	if (mode)

	if (csa_ie.mode)

		ieee80211_stop_queues_by_reason(&local->hw,

				IEEE80211_MAX_QUEUE_MAP,

				IEEE80211_QUEUE_STOP_REASON_CSA);
@@ -1048,9 +1046,9 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 
		/* use driver's channel switch callback */

		struct ieee80211_channel_switch ch_switch = {

			.timestamp = timestamp,

			.block_tx = mode,

			.chandef = new_chandef,

			.count = count,

			.block_tx = csa_ie.mode,

			.chandef = csa_ie.chandef,

			.count = csa_ie.count,

		};



		drv_channel_switch(local, &ch_switch);
@@ -1058,11 +1056,11 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 
	}



	/* channel switch handled in software */

	if (count <= 1)

	if (csa_ie.count <= 1)

		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);

	else

		mod_timer(&ifmgd->chswitch_timer,

			  TU_TO_EXP_TIME(count * cbss->beacon_interval));

			  TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));

}



static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,

net/mac80211/spectmgmt.c

+14 −13
Original line number Diff line number Diff line
@@ -24,8 +24,8 @@ 
int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,

				 struct ieee802_11_elems *elems, bool beacon,

				 enum ieee80211_band current_band,

				 u32 sta_flags, u8 *bssid, u8 *count, u8 *mode,

				 struct cfg80211_chan_def *new_chandef)

				 u32 sta_flags, u8 *bssid,

				 struct ieee80211_csa_ie *csa_ie)

{

	enum ieee80211_band new_band;

	int new_freq;
@@ -62,13 +62,13 @@ int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata, 
			return -EINVAL;

		}

		new_chan_no = elems->ext_chansw_ie->new_ch_num;

		*count = elems->ext_chansw_ie->count;

		*mode = elems->ext_chansw_ie->mode;

		csa_ie->count = elems->ext_chansw_ie->count;

		csa_ie->mode = elems->ext_chansw_ie->mode;

	} else if (elems->ch_switch_ie) {

		new_band = current_band;

		new_chan_no = elems->ch_switch_ie->new_ch_num;

		*count = elems->ch_switch_ie->count;

		*mode = elems->ch_switch_ie->mode;

		csa_ie->count = elems->ch_switch_ie->count;

		csa_ie->mode = elems->ch_switch_ie->mode;

	} else {

		/* nothing here we understand */

		return 1;
@@ -103,25 +103,26 @@ int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata, 
	default:

		/* secondary_channel_offset was present but is invalid */

	case IEEE80211_HT_PARAM_CHA_SEC_NONE:

		cfg80211_chandef_create(new_chandef, new_chan,

		cfg80211_chandef_create(&csa_ie->chandef, new_chan,

					NL80211_CHAN_HT20);

		break;

	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:

		cfg80211_chandef_create(new_chandef, new_chan,

		cfg80211_chandef_create(&csa_ie->chandef, new_chan,

					NL80211_CHAN_HT40PLUS);

		break;

	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:

		cfg80211_chandef_create(new_chandef, new_chan,

		cfg80211_chandef_create(&csa_ie->chandef, new_chan,

					NL80211_CHAN_HT40MINUS);

		break;

	case -1:

		cfg80211_chandef_create(new_chandef, new_chan,

		cfg80211_chandef_create(&csa_ie->chandef, new_chan,

					NL80211_CHAN_NO_HT);

		/* keep width for 5/10 MHz channels */

		switch (sdata->vif.bss_conf.chandef.width) {

		case NL80211_CHAN_WIDTH_5:

		case NL80211_CHAN_WIDTH_10:

			new_chandef->width = sdata->vif.bss_conf.chandef.width;

			csa_ie->chandef.width =

				sdata->vif.bss_conf.chandef.width;

			break;

		default:

			break;
@@ -171,13 +172,13 @@ int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata, 
	/* if VHT data is there validate & use it */

	if (new_vht_chandef.chan) {

		if (!cfg80211_chandef_compatible(&new_vht_chandef,

						 new_chandef)) {

						 &csa_ie->chandef)) {

			sdata_info(sdata,

				   "BSS %pM: CSA has inconsistent channel data, disconnecting\n",

				   bssid);

			return -EINVAL;

		}

		*new_chandef = new_vht_chandef;

		csa_ie->chandef = new_vht_chandef;

	}



	return 0;

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