File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/net/mac80211/mesh_ps.c b/net/mac80211/mesh_ps.c
new file mode 100644
index 0000000..90a268a
--- /dev/null
+++ b/net/mac80211/mesh_ps.c
@@ -0,0 +1,605 @@
+/*
+ * 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;
+ nullfunc->seq_ctrl = 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->mesh->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->mesh->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP)
+ light_sleep_cnt++;
+ else if (sta->mesh->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->mesh->local_pm == pm)
+ return 0;
+
+ mps_dbg(sdata, "local STA operates in mode %d with %pM\n",
+ pm, sta->sta.addr);
+
+ sta->mesh->local_pm = pm;
+
+ /*
+ * announce peer-specific power mode transition
+ * (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3)
+ */
+ if (sta->mesh->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->mesh->plink_state == NL80211_PLINK_ESTAB)
+ pm = sta->mesh->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->mesh->plink_state == NL80211_PLINK_ESTAB &&
+ sta->mesh->peer_pm != NL80211_MESH_POWER_UNKNOWN)
+ pm = sta->mesh->peer_pm;
+ else
+ pm = sta->mesh->nonpeer_pm;
+
+ do_buffer = (pm != NL80211_MESH_POWER_ACTIVE);
+
+ /* clear the MPSP flags for non-peers or active STA */
+ if (sta->mesh->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->mesh->peer_pm == pm)
+ return;
+
+ mps_dbg(sta->sdata, "STA %pM enters mode %d\n",
+ sta->sta.addr, pm);
+
+ sta->mesh->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->mesh->nonpeer_pm == pm)
+ return;
+
+ mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n",
+ sta->sta.addr, pm);
+
+ sta->mesh->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->mesh->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;
+
+ if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
+ has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len,
+ sta->mesh->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->mesh->plink_state == NL80211_PLINK_ESTAB)
+ mpsp_trigger_send(sta, has_buffered, !buffer_local);
+ else
+ mps_frame_deliver(sta, 1);
+}