From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- net/mac80211/mesh_ps.c | 605 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 605 insertions(+) create mode 100644 net/mac80211/mesh_ps.c (limited to 'net/mac80211/mesh_ps.c') diff --git a/net/mac80211/mesh_ps.c b/net/mac80211/mesh_ps.c new file mode 100644 index 000000000..d8cd91424 --- /dev/null +++ b/net/mac80211/mesh_ps.c @@ -0,0 +1,605 @@ +/* + * Copyright 2012-2013, Marco Porsch + * 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 = 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); + skb_put_zero(skb, 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); +} -- cgit v1.2.3