[mirror_ubuntu-artful-kernel.git] / net / mac80211 / mesh_ps.c

/*
 * Copyright 2012-2013, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de>
 * Copyright 2012-2013, cozybit Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include "mesh.h"
#include "wme.h"


/* mesh PS management */

/**
 * mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave
 */
static struct sk_buff *mps_qos_null_get(struct sta_info *sta)
{
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_hdr *nullfunc; /* use 4addr header */
	struct sk_buff *skb;
	int size = sizeof(*nullfunc);
	__le16 fc;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + size + 2);
	if (!skb)
		return NULL;
	skb_reserve(skb, local->hw.extra_tx_headroom);

	nullfunc = (struct ieee80211_hdr *) skb_put(skb, size);
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_NULLFUNC);
	ieee80211_fill_mesh_addresses(nullfunc, &fc, sta->sta.addr,
				      sdata->vif.addr);
	nullfunc->frame_control = fc;
	nullfunc->duration_id = 0;
	/* no address resolution for this frame -> set addr 1 immediately */
	memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
	memset(skb_put(skb, 2), 0, 2); /* append QoS control field */
	ieee80211_mps_set_frame_flags(sdata, sta, nullfunc);

	return skb;
}

/**
 * mps_qos_null_tx - send a QoS Null to indicate link-specific power mode
 */
static void mps_qos_null_tx(struct sta_info *sta)
{
	struct sk_buff *skb;

	skb = mps_qos_null_get(sta);
	if (!skb)
		return;

	mps_dbg(sta->sdata, "announcing peer-specific power mode to %pM\n",
		sta->sta.addr);

	/* don't unintentionally start a MPSP */
	if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
		u8 *qc = ieee80211_get_qos_ctl((void *) skb->data);

		qc[0] |= IEEE80211_QOS_CTL_EOSP;
	}

	ieee80211_tx_skb(sta->sdata, skb);
}

/**
 * ieee80211_mps_local_status_update - track status of local link-specific PMs
 *
 * @sdata: local mesh subif
 *
 * sets the non-peer power mode and triggers the driver PS (re-)configuration
 * Return BSS_CHANGED_BEACON if a beacon update is necessary.
 */
u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	struct sta_info *sta;
	bool peering = false;
	int light_sleep_cnt = 0;
	int deep_sleep_cnt = 0;
	u32 changed = 0;
	enum nl80211_mesh_power_mode nonpeer_pm;

	rcu_read_lock();
	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
		if (sdata != sta->sdata)
			continue;

		switch (sta->plink_state) {
		case NL80211_PLINK_OPN_SNT:
		case NL80211_PLINK_OPN_RCVD:
		case NL80211_PLINK_CNF_RCVD:
			peering = true;
			break;
		case NL80211_PLINK_ESTAB:
			if (sta->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP)
				light_sleep_cnt++;
			else if (sta->local_pm == NL80211_MESH_POWER_DEEP_SLEEP)
				deep_sleep_cnt++;
			break;
		default:
			break;
		}
	}
	rcu_read_unlock();

	/*
	 * Set non-peer mode to active during peering/scanning/authentication
	 * (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is
	 * deep sleep if the local STA is in light or deep sleep towards at
	 * least one mesh peer (see 13.14.3.1). Otherwise, set it to the
	 * user-configured default value.
	 */
	if (peering) {
		mps_dbg(sdata, "setting non-peer PM to active for peering\n");
		nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
	} else if (light_sleep_cnt || deep_sleep_cnt) {
		mps_dbg(sdata, "setting non-peer PM to deep sleep\n");
		nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP;
	} else {
		mps_dbg(sdata, "setting non-peer PM to user value\n");
		nonpeer_pm = ifmsh->mshcfg.power_mode;
	}

	/* need update if sleep counts move between 0 and non-zero */
	if (ifmsh->nonpeer_pm != nonpeer_pm ||
	    !ifmsh->ps_peers_light_sleep != !light_sleep_cnt ||
	    !ifmsh->ps_peers_deep_sleep != !deep_sleep_cnt)
		changed = BSS_CHANGED_BEACON;

	ifmsh->nonpeer_pm = nonpeer_pm;
	ifmsh->ps_peers_light_sleep = light_sleep_cnt;
	ifmsh->ps_peers_deep_sleep = deep_sleep_cnt;

	return changed;
}

/**
 * ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA
 *
 * @sta: mesh STA
 * @pm: the power mode to set
 * Return BSS_CHANGED_BEACON if a beacon update is in order.
 */
u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
				   enum nl80211_mesh_power_mode pm)
{
	struct ieee80211_sub_if_data *sdata = sta->sdata;

	if (sta->local_pm == pm)
		return 0;

	mps_dbg(sdata, "local STA operates in mode %d with %pM\n",
		pm, sta->sta.addr);

	sta->local_pm = pm;

	/*
	 * announce peer-specific power mode transition
	 * (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3)
	 */
	if (sta->plink_state == NL80211_PLINK_ESTAB)
		mps_qos_null_tx(sta);

	return ieee80211_mps_local_status_update(sdata);
}

/**
 * ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control)
 *
 * @sdata: local mesh subif
 * @sta: mesh STA
 * @hdr: 802.11 frame header
 *
 * see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11
 *
 * NOTE: sta must be given when an individually-addressed QoS frame header
 * is handled, for group-addressed and management frames it is not used
 */
void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
				   struct sta_info *sta,
				   struct ieee80211_hdr *hdr)
{
	enum nl80211_mesh_power_mode pm;
	u8 *qc;

	if (WARN_ON(is_unicast_ether_addr(hdr->addr1) &&
		    ieee80211_is_data_qos(hdr->frame_control) &&
		    !sta))
		return;

	if (is_unicast_ether_addr(hdr->addr1) &&
	    ieee80211_is_data_qos(hdr->frame_control) &&
	    sta->plink_state == NL80211_PLINK_ESTAB)
		pm = sta->local_pm;
	else
		pm = sdata->u.mesh.nonpeer_pm;

	if (pm == NL80211_MESH_POWER_ACTIVE)
		hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM);
	else
		hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);

	if (!ieee80211_is_data_qos(hdr->frame_control))
		return;

	qc = ieee80211_get_qos_ctl(hdr);

	if ((is_unicast_ether_addr(hdr->addr1) &&
	     pm == NL80211_MESH_POWER_DEEP_SLEEP) ||
	    (is_multicast_ether_addr(hdr->addr1) &&
	     sdata->u.mesh.ps_peers_deep_sleep > 0))
		qc[1] |= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
	else
		qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
}

/**
 * ieee80211_mps_sta_status_update - update buffering status of neighbor STA
 *
 * @sta: mesh STA
 *
 * called after change of peering status or non-peer/peer-specific power mode
 */
void ieee80211_mps_sta_status_update(struct sta_info *sta)
{
	enum nl80211_mesh_power_mode pm;
	bool do_buffer;

	/* For non-assoc STA, prevent buffering or frame transmission */
	if (sta->sta_state < IEEE80211_STA_ASSOC)
		return;

	/*
	 * use peer-specific power mode if peering is established and the
	 * peer's power mode is known
	 */
	if (sta->plink_state == NL80211_PLINK_ESTAB &&
	    sta->peer_pm != NL80211_MESH_POWER_UNKNOWN)
		pm = sta->peer_pm;
	else
		pm = sta->nonpeer_pm;

	do_buffer = (pm != NL80211_MESH_POWER_ACTIVE);

	/* clear the MPSP flags for non-peers or active STA */
	if (sta->plink_state != NL80211_PLINK_ESTAB) {
		clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
		clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
	} else if (!do_buffer) {
		clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
	}

	/* Don't let the same PS state be set twice */
	if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer)
		return;

	if (do_buffer) {
		set_sta_flag(sta, WLAN_STA_PS_STA);
		atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps);
		mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n",
			sta->sta.addr);
	} else {
		ieee80211_sta_ps_deliver_wakeup(sta);
	}
}

static void mps_set_sta_peer_pm(struct sta_info *sta,
				struct ieee80211_hdr *hdr)
{
	enum nl80211_mesh_power_mode pm;
	u8 *qc = ieee80211_get_qos_ctl(hdr);

	/*
	 * Test Power Management field of frame control (PW) and
	 * mesh power save level subfield of QoS control field (PSL)
	 *
	 * | PM | PSL| Mesh PM |
	 * +----+----+---------+
	 * | 0  |Rsrv|  Active |
	 * | 1  | 0  |  Light  |
	 * | 1  | 1  |  Deep   |
	 */
	if (ieee80211_has_pm(hdr->frame_control)) {
		if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8))
			pm = NL80211_MESH_POWER_DEEP_SLEEP;
		else
			pm = NL80211_MESH_POWER_LIGHT_SLEEP;
	} else {
		pm = NL80211_MESH_POWER_ACTIVE;
	}

	if (sta->peer_pm == pm)
		return;

	mps_dbg(sta->sdata, "STA %pM enters mode %d\n",
		sta->sta.addr, pm);

	sta->peer_pm = pm;

	ieee80211_mps_sta_status_update(sta);
}

static void mps_set_sta_nonpeer_pm(struct sta_info *sta,
				   struct ieee80211_hdr *hdr)
{
	enum nl80211_mesh_power_mode pm;

	if (ieee80211_has_pm(hdr->frame_control))
		pm = NL80211_MESH_POWER_DEEP_SLEEP;
	else
		pm = NL80211_MESH_POWER_ACTIVE;

	if (sta->nonpeer_pm == pm)
		return;

	mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n",
		sta->sta.addr, pm);

	sta->nonpeer_pm = pm;

	ieee80211_mps_sta_status_update(sta);
}

/**
 * ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave
 *
 * @sta: STA info that transmitted the frame
 * @hdr: IEEE 802.11 (QoS) Header
 */
void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
				    struct ieee80211_hdr *hdr)
{
	if (is_unicast_ether_addr(hdr->addr1) &&
	    ieee80211_is_data_qos(hdr->frame_control)) {
		/*
		 * individually addressed QoS Data/Null frames contain
		 * peer link-specific PS mode towards the local STA
		 */
		mps_set_sta_peer_pm(sta, hdr);

		/* check for mesh Peer Service Period trigger frames */
		ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr),
					       sta, false, false);
	} else {
		/*
		 * can only determine non-peer PS mode
		 * (see IEEE802.11-2012 8.2.4.1.7)
		 */
		mps_set_sta_nonpeer_pm(sta, hdr);
	}
}


/* mesh PS frame release */

static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp)
{
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	struct sk_buff *skb;
	struct ieee80211_hdr *nullfunc;
	struct ieee80211_tx_info *info;
	u8 *qc;

	skb = mps_qos_null_get(sta);
	if (!skb)
		return;

	nullfunc = (struct ieee80211_hdr *) skb->data;
	if (!eosp)
		nullfunc->frame_control |=
				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
	/*
	 * | RSPI | EOSP |  MPSP triggering   |
	 * +------+------+--------------------+
	 * |  0   |  0   | local STA is owner |
	 * |  0   |  1   | no MPSP (MPSP end) |
	 * |  1   |  0   | both STA are owner |
	 * |  1   |  1   | peer STA is owner  | see IEEE802.11-2012 13.14.9.2
	 */
	qc = ieee80211_get_qos_ctl(nullfunc);
	if (rspi)
		qc[1] |= (IEEE80211_QOS_CTL_RSPI >> 8);
	if (eosp)
		qc[0] |= IEEE80211_QOS_CTL_EOSP;

	info = IEEE80211_SKB_CB(skb);

	info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
		       IEEE80211_TX_CTL_REQ_TX_STATUS;

	mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n",
		rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr);

	ieee80211_tx_skb(sdata, skb);
}

/**
 * mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed
 *
 * To properly end a mesh MPSP the last transmitted frame has to set the EOSP
 * flag in the QoS Control field. In case the current tailing frame is not a
 * QoS Data frame, append a QoS Null to carry the flag.
 */
static void mpsp_qos_null_append(struct sta_info *sta,
				 struct sk_buff_head *frames)
{
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	struct sk_buff *new_skb, *skb = skb_peek_tail(frames);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_tx_info *info;

	if (ieee80211_is_data_qos(hdr->frame_control))
		return;

	new_skb = mps_qos_null_get(sta);
	if (!new_skb)
		return;

	mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n",
		sta->sta.addr);
	/*
	 * This frame has to be transmitted last. Assign lowest priority to
	 * make sure it cannot pass other frames when releasing multiple ACs.
	 */
	new_skb->priority = 1;
	skb_set_queue_mapping(new_skb, IEEE80211_AC_BK);
	ieee80211_set_qos_hdr(sdata, new_skb);

	info = IEEE80211_SKB_CB(new_skb);
	info->control.vif = &sdata->vif;
	info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;

	__skb_queue_tail(frames, new_skb);
}

/**
 * mps_frame_deliver - transmit frames during mesh powersave
 *
 * @sta: STA info to transmit to
 * @n_frames: number of frames to transmit. -1 for all
 */
static void mps_frame_deliver(struct sta_info *sta, int n_frames)
{
	struct ieee80211_local *local = sta->sdata->local;
	int ac;
	struct sk_buff_head frames;
	struct sk_buff *skb;
	bool more_data = false;

	skb_queue_head_init(&frames);

	/* collect frame(s) from buffers */
	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
		while (n_frames != 0) {
			skb = skb_dequeue(&sta->tx_filtered[ac]);
			if (!skb) {
				skb = skb_dequeue(
					&sta->ps_tx_buf[ac]);
				if (skb)
					local->total_ps_buffered--;
			}
			if (!skb)
				break;
			n_frames--;
			__skb_queue_tail(&frames, skb);
		}

		if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
		    !skb_queue_empty(&sta->ps_tx_buf[ac]))
			more_data = true;
	}

	/* nothing to send? -> EOSP */
	if (skb_queue_empty(&frames)) {
		mpsp_trigger_send(sta, false, true);
		return;
	}

	/* in a MPSP make sure the last skb is a QoS Data frame */
	if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
		mpsp_qos_null_append(sta, &frames);

	mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n",
		skb_queue_len(&frames), sta->sta.addr);

	/* prepare collected frames for transmission */
	skb_queue_walk(&frames, skb) {
		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
		struct ieee80211_hdr *hdr = (void *) skb->data;

		/*
		 * Tell TX path to send this frame even though the
		 * STA may still remain is PS mode after this frame
		 * exchange.
		 */
		info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;

		if (more_data || !skb_queue_is_last(&frames, skb))
			hdr->frame_control |=
				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
		else
			hdr->frame_control &=
				cpu_to_le16(~IEEE80211_FCTL_MOREDATA);

		if (skb_queue_is_last(&frames, skb) &&
		    ieee80211_is_data_qos(hdr->frame_control)) {
			u8 *qoshdr = ieee80211_get_qos_ctl(hdr);

			/* MPSP trigger frame ends service period */
			*qoshdr |= IEEE80211_QOS_CTL_EOSP;
			info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
		}
	}

	ieee80211_add_pending_skbs(local, &frames);
	sta_info_recalc_tim(sta);
}

/**
 * ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods
 *
 * @qc: QoS Control field
 * @sta: peer to start a MPSP with
 * @tx: frame was transmitted by the local STA
 * @acked: frame has been transmitted successfully
 *
 * NOTE: active mode STA may only serve as MPSP owner
 */
void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta,
				    bool tx, bool acked)
{
	u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8);
	u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP;

	if (tx) {
		if (rspi && acked)
			set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);

		if (eosp)
			clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
		else if (acked &&
			 test_sta_flag(sta, WLAN_STA_PS_STA) &&
			 !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
			mps_frame_deliver(sta, -1);
	} else {
		if (eosp)
			clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
		else if (sta->local_pm != NL80211_MESH_POWER_ACTIVE)
			set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);

		if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
			mps_frame_deliver(sta, -1);
	}
}

/**
 * ieee80211_mps_frame_release - release frames buffered due to mesh power save
 *
 * @sta: mesh STA
 * @elems: IEs of beacon or probe response
 *
 * For peers if we have individually-addressed frames buffered or the peer
 * indicates buffered frames, send a corresponding MPSP trigger frame. Since
 * we do not evaluate the awake window duration, QoS Nulls are used as MPSP
 * trigger frames. If the neighbour STA is not a peer, only send single frames.
 */
void ieee80211_mps_frame_release(struct sta_info *sta,
				 struct ieee802_11_elems *elems)
{
	int ac, buffer_local = 0;
	bool has_buffered = false;

	/* TIM map only for LLID <= IEEE80211_MAX_AID */
	if (sta->plink_state == NL80211_PLINK_ESTAB)
		has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len,
				le16_to_cpu(sta->llid) % IEEE80211_MAX_AID);

	if (has_buffered)
		mps_dbg(sta->sdata, "%pM indicates buffered frames\n",
			sta->sta.addr);

	/* only transmit to PS STA with announced, non-zero awake window */
	if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
	    (!elems->awake_window || !le16_to_cpu(*elems->awake_window)))
		return;

	if (!test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
			buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) +
					skb_queue_len(&sta->tx_filtered[ac]);

	if (!has_buffered && !buffer_local)
		return;

	if (sta->plink_state == NL80211_PLINK_ESTAB)
		mpsp_trigger_send(sta, has_buffered, !buffer_local);
	else
		mps_frame_deliver(sta, 1);
}
Commit	Line	Data
3f52b7e3 MP	1	/*
	2	* Copyright 2012-2013, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de>
	3	* Copyright 2012-2013, cozybit Inc.
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*/
	9
	10	#include "mesh.h"
	11	#include "wme.h"
	12
	13
	14	/* mesh PS management */
	15
	16	/**
	17	* mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave
	18	*/
	19	static struct sk_buff mps_qos_null_get(struct sta_info sta)
	20	{
	21	struct ieee80211_sub_if_data *sdata = sta->sdata;
	22	struct ieee80211_local *local = sdata->local;
	23	struct ieee80211_hdr nullfunc; / use 4addr header */
	24	struct sk_buff *skb;
	25	int size = sizeof(*nullfunc);
	26	__le16 fc;
	27
	28	skb = dev_alloc_skb(local->hw.extra_tx_headroom + size + 2);
	29	if (!skb)
	30	return NULL;
	31	skb_reserve(skb, local->hw.extra_tx_headroom);
	32
	33	nullfunc = (struct ieee80211_hdr *) skb_put(skb, size);
	34	fc = cpu_to_le16(IEEE80211_FTYPE_DATA \| IEEE80211_STYPE_QOS_NULLFUNC);
	35	ieee80211_fill_mesh_addresses(nullfunc, &fc, sta->sta.addr,
	36	sdata->vif.addr);
	37	nullfunc->frame_control = fc;
	38	nullfunc->duration_id = 0;
	39	/* no address resolution for this frame -> set addr 1 immediately */
	40	memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
	41	memset(skb_put(skb, 2), 0, 2); /* append QoS control field */
	42	ieee80211_mps_set_frame_flags(sdata, sta, nullfunc);
	43
	44	return skb;
	45	}
	46
	47	/**
	48	* mps_qos_null_tx - send a QoS Null to indicate link-specific power mode
	49	*/
	50	static void mps_qos_null_tx(struct sta_info *sta)
	51	{
	52	struct sk_buff *skb;
	53
	54	skb = mps_qos_null_get(sta);
	55	if (!skb)
	56	return;
	57
	58	mps_dbg(sta->sdata, "announcing peer-specific power mode to %pM\n",
	59	sta->sta.addr);
	60
	61	/* don't unintentionally start a MPSP */
	62	if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
	63	u8 qc = ieee80211_get_qos_ctl((void ) skb->data);
	64
65	qc[0] \|= IEEE80211_QOS_CTL_EOSP;
66	}
67
68	ieee80211_tx_skb(sta->sdata, skb);
69	}
70
71	/**
72	* ieee80211_mps_local_status_update - track status of local link-specific PMs
73	*
74	* @sdata: local mesh subif
75	*
76	* sets the non-peer power mode and triggers the driver PS (re-)configuration
39886b61	77	* Return BSS_CHANGED_BEACON if a beacon update is necessary.
3f52b7e3	78	*/
39886b61	79	u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata)
3f52b7e3 MP	80	{
	81	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	82	struct sta_info *sta;
	83	bool peering = false;
	84	int light_sleep_cnt = 0;
	85	int deep_sleep_cnt = 0;
39886b61 TP	86	u32 changed = 0;
39886b61 TP	87	enum nl80211_mesh_power_mode nonpeer_pm;
3f52b7e3 MP	88
	89	rcu_read_lock();
	90	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
	91	if (sdata != sta->sdata)
	92	continue;
	93
	94	switch (sta->plink_state) {
	95	case NL80211_PLINK_OPN_SNT:
	96	case NL80211_PLINK_OPN_RCVD:
	97	case NL80211_PLINK_CNF_RCVD:
	98	peering = true;
	99	break;
	100	case NL80211_PLINK_ESTAB:
	101	if (sta->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP)
	102	light_sleep_cnt++;
	103	else if (sta->local_pm == NL80211_MESH_POWER_DEEP_SLEEP)
	104	deep_sleep_cnt++;
	105	break;
	106	default:
	107	break;
	108	}
	109	}
	110	rcu_read_unlock();
	111
	112	/*
	113	* Set non-peer mode to active during peering/scanning/authentication
	114	* (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is
	115	* deep sleep if the local STA is in light or deep sleep towards at
	116	* least one mesh peer (see 13.14.3.1). Otherwise, set it to the
	117	* user-configured default value.
	118	*/
	119	if (peering) {
	120	mps_dbg(sdata, "setting non-peer PM to active for peering\n");
39886b61	121	nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
3f52b7e3 MP	122	} else if (light_sleep_cnt \|\| deep_sleep_cnt) {
3f52b7e3 MP	123	mps_dbg(sdata, "setting non-peer PM to deep sleep\n");
39886b61	124	nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP;
3f52b7e3 MP	125	} else {
3f52b7e3 MP	126	mps_dbg(sdata, "setting non-peer PM to user value\n");
39886b61	127	nonpeer_pm = ifmsh->mshcfg.power_mode;
3f52b7e3 MP	128	}
3f52b7e3 MP	129
39886b61 TP	130	/* need update if sleep counts move between 0 and non-zero */
	131	if (ifmsh->nonpeer_pm != nonpeer_pm \|\|
	132	!ifmsh->ps_peers_light_sleep != !light_sleep_cnt \|\|
	133	!ifmsh->ps_peers_deep_sleep != !deep_sleep_cnt)
	134	changed = BSS_CHANGED_BEACON;
	135
	136	ifmsh->nonpeer_pm = nonpeer_pm;
3f52b7e3 MP	137	ifmsh->ps_peers_light_sleep = light_sleep_cnt;
3f52b7e3 MP	138	ifmsh->ps_peers_deep_sleep = deep_sleep_cnt;
39886b61 TP	139
39886b61 TP	140	return changed;
3f52b7e3 MP	141	}
	142
	143	/**
	144	* ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA
	145	*
	146	* @sta: mesh STA
	147	* @pm: the power mode to set
39886b61	148	* Return BSS_CHANGED_BEACON if a beacon update is in order.
3f52b7e3	149	*/
39886b61 TP	150	u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
39886b61 TP	151	enum nl80211_mesh_power_mode pm)
3f52b7e3 MP	152	{
	153	struct ieee80211_sub_if_data *sdata = sta->sdata;
	154
446075d7 MP	155	if (sta->local_pm == pm)
	156	return 0;
	157
3f52b7e3 MP	158	mps_dbg(sdata, "local STA operates in mode %d with %pM\n",
	159	pm, sta->sta.addr);
	160
	161	sta->local_pm = pm;
	162
	163	/*
	164	* announce peer-specific power mode transition
	165	* (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3)
	166	*/
	167	if (sta->plink_state == NL80211_PLINK_ESTAB)
	168	mps_qos_null_tx(sta);
	169
39886b61	170	return ieee80211_mps_local_status_update(sdata);
3f52b7e3 MP	171	}
	172
	173	/**
	174	* ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control)
	175	*
	176	* @sdata: local mesh subif
	177	* @sta: mesh STA
	178	* @hdr: 802.11 frame header
	179	*
	180	* see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11
	181	*
	182	* NOTE: sta must be given when an individually-addressed QoS frame header
	183	* is handled, for group-addressed and management frames it is not used
	184	*/
	185	void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
	186	struct sta_info *sta,
	187	struct ieee80211_hdr *hdr)
	188	{
	189	enum nl80211_mesh_power_mode pm;
	190	u8 *qc;
	191
	192	if (WARN_ON(is_unicast_ether_addr(hdr->addr1) &&
	193	ieee80211_is_data_qos(hdr->frame_control) &&
	194	!sta))
	195	return;
	196
	197	if (is_unicast_ether_addr(hdr->addr1) &&
	198	ieee80211_is_data_qos(hdr->frame_control) &&
	199	sta->plink_state == NL80211_PLINK_ESTAB)
	200	pm = sta->local_pm;
	201	else
	202	pm = sdata->u.mesh.nonpeer_pm;
	203
	204	if (pm == NL80211_MESH_POWER_ACTIVE)
	205	hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM);
	206	else
	207	hdr->frame_control \|= cpu_to_le16(IEEE80211_FCTL_PM);
	208
	209	if (!ieee80211_is_data_qos(hdr->frame_control))
	210	return;
	211
	212	qc = ieee80211_get_qos_ctl(hdr);
	213
	214	if ((is_unicast_ether_addr(hdr->addr1) &&
	215	pm == NL80211_MESH_POWER_DEEP_SLEEP) \|\|
	216	(is_multicast_ether_addr(hdr->addr1) &&
	217	sdata->u.mesh.ps_peers_deep_sleep > 0))
	218	qc[1] \|= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
	219	else
	220	qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
	221	}
	222
	223	/**
	224	* ieee80211_mps_sta_status_update - update buffering status of neighbor STA
	225	*
	226	* @sta: mesh STA
	227	*
	228	* called after change of peering status or non-peer/peer-specific power mode
	229	*/
	230	void ieee80211_mps_sta_status_update(struct sta_info *sta)
	231	{
	232	enum nl80211_mesh_power_mode pm;
	233	bool do_buffer;
	234
40d18ff9 CYY	235	/* For non-assoc STA, prevent buffering or frame transmission */
	236	if (sta->sta_state < IEEE80211_STA_ASSOC)
	237	return;
	238
3f52b7e3 MP	239	/*
	240	* use peer-specific power mode if peering is established and the
	241	* peer's power mode is known
	242	*/
	243	if (sta->plink_state == NL80211_PLINK_ESTAB &&
	244	sta->peer_pm != NL80211_MESH_POWER_UNKNOWN)
	245	pm = sta->peer_pm;
	246	else
	247	pm = sta->nonpeer_pm;
	248
	249	do_buffer = (pm != NL80211_MESH_POWER_ACTIVE);
	250
446075d7 MP	251	/* clear the MPSP flags for non-peers or active STA */
	252	if (sta->plink_state != NL80211_PLINK_ESTAB) {
	253	clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
	254	clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
	255	} else if (!do_buffer) {
	256	clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
	257	}
	258
3f52b7e3 MP	259	/* Don't let the same PS state be set twice */
	260	if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer)
	261	return;
	262
	263	if (do_buffer) {
	264	set_sta_flag(sta, WLAN_STA_PS_STA);
	265	atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps);
	266	mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n",
	267	sta->sta.addr);
	268	} else {
	269	ieee80211_sta_ps_deliver_wakeup(sta);
	270	}
3f52b7e3 MP	271	}
	272
	273	static void mps_set_sta_peer_pm(struct sta_info *sta,
	274	struct ieee80211_hdr *hdr)
	275	{
	276	enum nl80211_mesh_power_mode pm;
	277	u8 *qc = ieee80211_get_qos_ctl(hdr);
	278
	279	/*
	280	* Test Power Management field of frame control (PW) and
	281	* mesh power save level subfield of QoS control field (PSL)
	282	*
	283	* \| PM \| PSL\| Mesh PM \|
	284	* +----+----+---------+
	285	* \| 0 \|Rsrv\| Active \|
	286	* \| 1 \| 0 \| Light \|
	287	* \| 1 \| 1 \| Deep \|
	288	*/
	289	if (ieee80211_has_pm(hdr->frame_control)) {
	290	if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8))
	291	pm = NL80211_MESH_POWER_DEEP_SLEEP;
	292	else
	293	pm = NL80211_MESH_POWER_LIGHT_SLEEP;
	294	} else {
	295	pm = NL80211_MESH_POWER_ACTIVE;
	296	}
	297
	298	if (sta->peer_pm == pm)
	299	return;
	300
	301	mps_dbg(sta->sdata, "STA %pM enters mode %d\n",
	302	sta->sta.addr, pm);
	303
	304	sta->peer_pm = pm;
	305
	306	ieee80211_mps_sta_status_update(sta);
	307	}
	308
	309	static void mps_set_sta_nonpeer_pm(struct sta_info *sta,
	310	struct ieee80211_hdr *hdr)
	311	{
	312	enum nl80211_mesh_power_mode pm;
	313
	314	if (ieee80211_has_pm(hdr->frame_control))
	315	pm = NL80211_MESH_POWER_DEEP_SLEEP;
	316	else
	317	pm = NL80211_MESH_POWER_ACTIVE;
	318
	319	if (sta->nonpeer_pm == pm)
	320	return;
	321
	322	mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n",
	323	sta->sta.addr, pm);
	324
	325	sta->nonpeer_pm = pm;
	326
	327	ieee80211_mps_sta_status_update(sta);
	328	}
	329
	330	/**
	331	* ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave
	332	*
	333	* @sta: STA info that transmitted the frame
	334	* @hdr: IEEE 802.11 (QoS) Header
335	*/
336	void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
337	struct ieee80211_hdr *hdr)
338	{
339	if (is_unicast_ether_addr(hdr->addr1) &&
340	ieee80211_is_data_qos(hdr->frame_control)) {
341	/*
342	* individually addressed QoS Data/Null frames contain
343	* peer link-specific PS mode towards the local STA
344	*/
345	mps_set_sta_peer_pm(sta, hdr);
346
347	/* check for mesh Peer Service Period trigger frames */
348	ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr),
349	sta, false, false);
350	} else {
351	/*
352	* can only determine non-peer PS mode
353	* (see IEEE802.11-2012 8.2.4.1.7)
354	*/
355	mps_set_sta_nonpeer_pm(sta, hdr);
356	}
357	}
358
359
360	/* mesh PS frame release */
361
362	static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp)
363	{
364	struct ieee80211_sub_if_data *sdata = sta->sdata;
365	struct sk_buff *skb;
366	struct ieee80211_hdr *nullfunc;
367	struct ieee80211_tx_info *info;
368	u8 *qc;
369
370	skb = mps_qos_null_get(sta);
371	if (!skb)
372	return;
373
374	nullfunc = (struct ieee80211_hdr *) skb->data;
375	if (!eosp)
376	nullfunc->frame_control \|=
377	cpu_to_le16(IEEE80211_FCTL_MOREDATA);
378	/*
379	* \| RSPI \| EOSP \| MPSP triggering \|
380	* +------+------+--------------------+
381	* \| 0 \| 0 \| local STA is owner \|
382	* \| 0 \| 1 \| no MPSP (MPSP end) \|
383	* \| 1 \| 0 \| both STA are owner \|
384	* \| 1 \| 1 \| peer STA is owner \| see IEEE802.11-2012 13.14.9.2
385	*/
386	qc = ieee80211_get_qos_ctl(nullfunc);
387	if (rspi)
388	qc[1] \|= (IEEE80211_QOS_CTL_RSPI >> 8);
389	if (eosp)
390	qc[0] \|= IEEE80211_QOS_CTL_EOSP;
391
392	info = IEEE80211_SKB_CB(skb);
393
394	info->flags \|= IEEE80211_TX_CTL_NO_PS_BUFFER \|
395	IEEE80211_TX_CTL_REQ_TX_STATUS;
396
397	mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n",
398	rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr);
399
400	ieee80211_tx_skb(sdata, skb);
401	}
402
403	/**
404	* mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed
405	*
406	* To properly end a mesh MPSP the last transmitted frame has to set the EOSP
407	* flag in the QoS Control field. In case the current tailing frame is not a
408	* QoS Data frame, append a QoS Null to carry the flag.
409	*/
410	static void mpsp_qos_null_append(struct sta_info *sta,
411	struct sk_buff_head *frames)
412	{
413	struct ieee80211_sub_if_data *sdata = sta->sdata;
414	struct sk_buff new_skb, skb = skb_peek_tail(frames);
415	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
416	struct ieee80211_tx_info *info;
417
418	if (ieee80211_is_data_qos(hdr->frame_control))
419	return;
420
421	new_skb = mps_qos_null_get(sta);
422	if (!new_skb)
423	return;
424
425	mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n",
426	sta->sta.addr);
427	/*
428	* This frame has to be transmitted last. Assign lowest priority to
429	* make sure it cannot pass other frames when releasing multiple ACs.
430	*/
431	new_skb->priority = 1;
432	skb_set_queue_mapping(new_skb, IEEE80211_AC_BK);
433	ieee80211_set_qos_hdr(sdata, new_skb);
434
435	info = IEEE80211_SKB_CB(new_skb);
436	info->control.vif = &sdata->vif;
437	info->flags \|= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
438
439	__skb_queue_tail(frames, new_skb);
440	}
441
442	/**
443	* mps_frame_deliver - transmit frames during mesh powersave
444	*
445	* @sta: STA info to transmit to
446	* @n_frames: number of frames to transmit. -1 for all
447	*/
448	static void mps_frame_deliver(struct sta_info *sta, int n_frames)
449	{
446075d7	450	struct ieee80211_local *local = sta->sdata->local;
3f52b7e3 MP	451	int ac;
	452	struct sk_buff_head frames;
	453	struct sk_buff *skb;
	454	bool more_data = false;
	455
	456	skb_queue_head_init(&frames);
	457
	458	/* collect frame(s) from buffers */
	459	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
	460	while (n_frames != 0) {
	461	skb = skb_dequeue(&sta->tx_filtered[ac]);
	462	if (!skb) {
	463	skb = skb_dequeue(
	464	&sta->ps_tx_buf[ac]);
	465	if (skb)
	466	local->total_ps_buffered--;
	467	}
	468	if (!skb)
	469	break;
	470	n_frames--;
	471	__skb_queue_tail(&frames, skb);
	472	}
	473
	474	if (!skb_queue_empty(&sta->tx_filtered[ac]) \|\|
	475	!skb_queue_empty(&sta->ps_tx_buf[ac]))
	476	more_data = true;
	477	}
	478
	479	/* nothing to send? -> EOSP */
	480	if (skb_queue_empty(&frames)) {
	481	mpsp_trigger_send(sta, false, true);
	482	return;
	483	}
	484
	485	/* in a MPSP make sure the last skb is a QoS Data frame */
	486	if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
	487	mpsp_qos_null_append(sta, &frames);
	488
	489	mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n",
	490	skb_queue_len(&frames), sta->sta.addr);
	491
	492	/* prepare collected frames for transmission */
	493	skb_queue_walk(&frames, skb) {
	494	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	495	struct ieee80211_hdr hdr = (void ) skb->data;
	496
	497	/*
	498	* Tell TX path to send this frame even though the
	499	* STA may still remain is PS mode after this frame
	500	* exchange.
	501	*/
	502	info->flags \|= IEEE80211_TX_CTL_NO_PS_BUFFER;
	503
	504	if (more_data \|\| !skb_queue_is_last(&frames, skb))
	505	hdr->frame_control \|=
	506	cpu_to_le16(IEEE80211_FCTL_MOREDATA);
	507	else
	508	hdr->frame_control &=
	509	cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
	510
	511	if (skb_queue_is_last(&frames, skb) &&
	512	ieee80211_is_data_qos(hdr->frame_control)) {
	513	u8 *qoshdr = ieee80211_get_qos_ctl(hdr);
	514
515	/* MPSP trigger frame ends service period */
516	*qoshdr \|= IEEE80211_QOS_CTL_EOSP;
517	info->flags \|= IEEE80211_TX_CTL_REQ_TX_STATUS;
518	}
519	}
520
521	ieee80211_add_pending_skbs(local, &frames);
522	sta_info_recalc_tim(sta);
523	}
524
525	/**
526	* ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods
527	*
528	* @qc: QoS Control field
529	* @sta: peer to start a MPSP with
530	* @tx: frame was transmitted by the local STA
531	* @acked: frame has been transmitted successfully
532	*
533	* NOTE: active mode STA may only serve as MPSP owner
534	*/
535	void ieee80211_mpsp_trigger_process(u8 qc, struct sta_info sta,
536	bool tx, bool acked)
537	{
538	u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8);
539	u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP;
540
541	if (tx) {
542	if (rspi && acked)
543	set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
544
545	if (eosp)
546	clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
547	else if (acked &&
548	test_sta_flag(sta, WLAN_STA_PS_STA) &&
549	!test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
550	mps_frame_deliver(sta, -1);
551	} else {
552	if (eosp)
553	clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
554	else if (sta->local_pm != NL80211_MESH_POWER_ACTIVE)
555	set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
556
557	if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
558	mps_frame_deliver(sta, -1);
559	}
560	}
561
562	/**
446075d7	563	* ieee80211_mps_frame_release - release frames buffered due to mesh power save
3f52b7e3 MP	564	*
3f52b7e3 MP	565	* @sta: mesh STA
446075d7	566	* @elems: IEs of beacon or probe response
3f52b7e3 MP	567	*
	568	* For peers if we have individually-addressed frames buffered or the peer
	569	* indicates buffered frames, send a corresponding MPSP trigger frame. Since
	570	* we do not evaluate the awake window duration, QoS Nulls are used as MPSP
	571	* trigger frames. If the neighbour STA is not a peer, only send single frames.
	572	*/
	573	void ieee80211_mps_frame_release(struct sta_info *sta,
	574	struct ieee802_11_elems *elems)
	575	{
	576	int ac, buffer_local = 0;
	577	bool has_buffered = false;
	578
	579	/* TIM map only for LLID <= IEEE80211_MAX_AID */
	580	if (sta->plink_state == NL80211_PLINK_ESTAB)
	581	has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len,
	582	le16_to_cpu(sta->llid) % IEEE80211_MAX_AID);
	583
	584	if (has_buffered)
	585	mps_dbg(sta->sdata, "%pM indicates buffered frames\n",
	586	sta->sta.addr);
	587
	588	/* only transmit to PS STA with announced, non-zero awake window */
	589	if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
	590	(!elems->awake_window \|\| !le16_to_cpu(*elems->awake_window)))
	591	return;
	592
446075d7 MP	593	if (!test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
	594	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
	595	buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) +
	596	skb_queue_len(&sta->tx_filtered[ac]);
3f52b7e3 MP	597
	598	if (!has_buffered && !buffer_local)
	599	return;
	600
	601	if (sta->plink_state == NL80211_PLINK_ESTAB)
	602	mpsp_trigger_send(sta, has_buffered, !buffer_local);
	603	else
	604	mps_frame_deliver(sta, 1);
	605	}