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607 lines
16 KiB
607 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright 2012-2013, Marco Porsch <[email protected]> |
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* Copyright 2012-2013, cozybit Inc. |
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* Copyright (C) 2021 Intel Corporation |
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*/ |
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|
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#include "mesh.h" |
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#include "wme.h" |
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/* mesh PS management */ |
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|
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/** |
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* mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave |
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* @sta: the station to get the frame for |
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*/ |
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static struct sk_buff *mps_qos_null_get(struct sta_info *sta) |
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{ |
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struct ieee80211_sub_if_data *sdata = sta->sdata; |
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struct ieee80211_local *local = sdata->local; |
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struct ieee80211_hdr *nullfunc; /* use 4addr header */ |
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struct sk_buff *skb; |
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int size = sizeof(*nullfunc); |
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__le16 fc; |
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skb = dev_alloc_skb(local->hw.extra_tx_headroom + size + 2); |
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if (!skb) |
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return NULL; |
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skb_reserve(skb, local->hw.extra_tx_headroom); |
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nullfunc = skb_put(skb, size); |
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fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_NULLFUNC); |
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ieee80211_fill_mesh_addresses(nullfunc, &fc, sta->sta.addr, |
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sdata->vif.addr); |
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nullfunc->frame_control = fc; |
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nullfunc->duration_id = 0; |
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nullfunc->seq_ctrl = 0; |
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/* no address resolution for this frame -> set addr 1 immediately */ |
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memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN); |
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skb_put_zero(skb, 2); /* append QoS control field */ |
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ieee80211_mps_set_frame_flags(sdata, sta, nullfunc); |
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return skb; |
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} |
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/** |
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* mps_qos_null_tx - send a QoS Null to indicate link-specific power mode |
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* @sta: the station to send to |
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*/ |
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static void mps_qos_null_tx(struct sta_info *sta) |
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{ |
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struct sk_buff *skb; |
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skb = mps_qos_null_get(sta); |
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if (!skb) |
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return; |
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mps_dbg(sta->sdata, "announcing peer-specific power mode to %pM\n", |
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sta->sta.addr); |
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/* don't unintentionally start a MPSP */ |
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if (!test_sta_flag(sta, WLAN_STA_PS_STA)) { |
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u8 *qc = ieee80211_get_qos_ctl((void *) skb->data); |
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qc[0] |= IEEE80211_QOS_CTL_EOSP; |
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} |
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ieee80211_tx_skb(sta->sdata, skb); |
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} |
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/** |
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* ieee80211_mps_local_status_update - track status of local link-specific PMs |
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* |
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* @sdata: local mesh subif |
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* |
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* sets the non-peer power mode and triggers the driver PS (re-)configuration |
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* Return BSS_CHANGED_BEACON if a beacon update is necessary. |
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*/ |
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u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata) |
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{ |
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struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
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struct sta_info *sta; |
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bool peering = false; |
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int light_sleep_cnt = 0; |
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int deep_sleep_cnt = 0; |
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u32 changed = 0; |
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enum nl80211_mesh_power_mode nonpeer_pm; |
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rcu_read_lock(); |
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list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { |
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if (sdata != sta->sdata) |
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continue; |
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switch (sta->mesh->plink_state) { |
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case NL80211_PLINK_OPN_SNT: |
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case NL80211_PLINK_OPN_RCVD: |
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case NL80211_PLINK_CNF_RCVD: |
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peering = true; |
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break; |
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case NL80211_PLINK_ESTAB: |
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if (sta->mesh->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP) |
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light_sleep_cnt++; |
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else if (sta->mesh->local_pm == NL80211_MESH_POWER_DEEP_SLEEP) |
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deep_sleep_cnt++; |
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break; |
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default: |
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break; |
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} |
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} |
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rcu_read_unlock(); |
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/* |
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* Set non-peer mode to active during peering/scanning/authentication |
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* (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is |
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* deep sleep if the local STA is in light or deep sleep towards at |
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* least one mesh peer (see 13.14.3.1). Otherwise, set it to the |
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* user-configured default value. |
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*/ |
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if (peering) { |
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mps_dbg(sdata, "setting non-peer PM to active for peering\n"); |
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nonpeer_pm = NL80211_MESH_POWER_ACTIVE; |
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} else if (light_sleep_cnt || deep_sleep_cnt) { |
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mps_dbg(sdata, "setting non-peer PM to deep sleep\n"); |
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nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP; |
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} else { |
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mps_dbg(sdata, "setting non-peer PM to user value\n"); |
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nonpeer_pm = ifmsh->mshcfg.power_mode; |
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} |
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/* need update if sleep counts move between 0 and non-zero */ |
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if (ifmsh->nonpeer_pm != nonpeer_pm || |
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!ifmsh->ps_peers_light_sleep != !light_sleep_cnt || |
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!ifmsh->ps_peers_deep_sleep != !deep_sleep_cnt) |
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changed = BSS_CHANGED_BEACON; |
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ifmsh->nonpeer_pm = nonpeer_pm; |
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ifmsh->ps_peers_light_sleep = light_sleep_cnt; |
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ifmsh->ps_peers_deep_sleep = deep_sleep_cnt; |
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return changed; |
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} |
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/** |
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* ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA |
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* |
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* @sta: mesh STA |
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* @pm: the power mode to set |
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* Return BSS_CHANGED_BEACON if a beacon update is in order. |
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*/ |
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u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta, |
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enum nl80211_mesh_power_mode pm) |
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{ |
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struct ieee80211_sub_if_data *sdata = sta->sdata; |
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if (sta->mesh->local_pm == pm) |
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return 0; |
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mps_dbg(sdata, "local STA operates in mode %d with %pM\n", |
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pm, sta->sta.addr); |
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sta->mesh->local_pm = pm; |
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/* |
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* announce peer-specific power mode transition |
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* (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3) |
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*/ |
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if (sta->mesh->plink_state == NL80211_PLINK_ESTAB) |
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mps_qos_null_tx(sta); |
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return ieee80211_mps_local_status_update(sdata); |
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} |
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/** |
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* ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control) |
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* |
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* @sdata: local mesh subif |
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* @sta: mesh STA |
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* @hdr: 802.11 frame header |
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* |
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* see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11 |
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* |
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* NOTE: sta must be given when an individually-addressed QoS frame header |
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* is handled, for group-addressed and management frames it is not used |
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*/ |
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void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata, |
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struct sta_info *sta, |
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struct ieee80211_hdr *hdr) |
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{ |
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enum nl80211_mesh_power_mode pm; |
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u8 *qc; |
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if (WARN_ON(is_unicast_ether_addr(hdr->addr1) && |
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ieee80211_is_data_qos(hdr->frame_control) && |
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!sta)) |
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return; |
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if (is_unicast_ether_addr(hdr->addr1) && |
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ieee80211_is_data_qos(hdr->frame_control) && |
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sta->mesh->plink_state == NL80211_PLINK_ESTAB) |
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pm = sta->mesh->local_pm; |
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else |
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pm = sdata->u.mesh.nonpeer_pm; |
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if (pm == NL80211_MESH_POWER_ACTIVE) |
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hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM); |
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else |
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hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); |
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if (!ieee80211_is_data_qos(hdr->frame_control)) |
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return; |
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qc = ieee80211_get_qos_ctl(hdr); |
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if ((is_unicast_ether_addr(hdr->addr1) && |
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pm == NL80211_MESH_POWER_DEEP_SLEEP) || |
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(is_multicast_ether_addr(hdr->addr1) && |
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sdata->u.mesh.ps_peers_deep_sleep > 0)) |
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qc[1] |= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8); |
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else |
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qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8); |
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} |
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/** |
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* ieee80211_mps_sta_status_update - update buffering status of neighbor STA |
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* |
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* @sta: mesh STA |
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* |
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* called after change of peering status or non-peer/peer-specific power mode |
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*/ |
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void ieee80211_mps_sta_status_update(struct sta_info *sta) |
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{ |
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enum nl80211_mesh_power_mode pm; |
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bool do_buffer; |
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/* For non-assoc STA, prevent buffering or frame transmission */ |
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if (sta->sta_state < IEEE80211_STA_ASSOC) |
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return; |
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/* |
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* use peer-specific power mode if peering is established and the |
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* peer's power mode is known |
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*/ |
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if (sta->mesh->plink_state == NL80211_PLINK_ESTAB && |
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sta->mesh->peer_pm != NL80211_MESH_POWER_UNKNOWN) |
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pm = sta->mesh->peer_pm; |
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else |
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pm = sta->mesh->nonpeer_pm; |
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do_buffer = (pm != NL80211_MESH_POWER_ACTIVE); |
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/* clear the MPSP flags for non-peers or active STA */ |
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if (sta->mesh->plink_state != NL80211_PLINK_ESTAB) { |
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clear_sta_flag(sta, WLAN_STA_MPSP_OWNER); |
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clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); |
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} else if (!do_buffer) { |
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clear_sta_flag(sta, WLAN_STA_MPSP_OWNER); |
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} |
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/* Don't let the same PS state be set twice */ |
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if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer) |
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return; |
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if (do_buffer) { |
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set_sta_flag(sta, WLAN_STA_PS_STA); |
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atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps); |
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mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n", |
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sta->sta.addr); |
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} else { |
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ieee80211_sta_ps_deliver_wakeup(sta); |
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} |
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} |
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static void mps_set_sta_peer_pm(struct sta_info *sta, |
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struct ieee80211_hdr *hdr) |
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{ |
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enum nl80211_mesh_power_mode pm; |
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u8 *qc = ieee80211_get_qos_ctl(hdr); |
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/* |
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* Test Power Management field of frame control (PW) and |
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* mesh power save level subfield of QoS control field (PSL) |
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* |
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* | PM | PSL| Mesh PM | |
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* +----+----+---------+ |
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* | 0 |Rsrv| Active | |
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* | 1 | 0 | Light | |
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* | 1 | 1 | Deep | |
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*/ |
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if (ieee80211_has_pm(hdr->frame_control)) { |
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if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8)) |
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pm = NL80211_MESH_POWER_DEEP_SLEEP; |
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else |
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pm = NL80211_MESH_POWER_LIGHT_SLEEP; |
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} else { |
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pm = NL80211_MESH_POWER_ACTIVE; |
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} |
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if (sta->mesh->peer_pm == pm) |
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return; |
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mps_dbg(sta->sdata, "STA %pM enters mode %d\n", |
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sta->sta.addr, pm); |
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sta->mesh->peer_pm = pm; |
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ieee80211_mps_sta_status_update(sta); |
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} |
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static void mps_set_sta_nonpeer_pm(struct sta_info *sta, |
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struct ieee80211_hdr *hdr) |
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{ |
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enum nl80211_mesh_power_mode pm; |
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if (ieee80211_has_pm(hdr->frame_control)) |
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pm = NL80211_MESH_POWER_DEEP_SLEEP; |
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else |
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pm = NL80211_MESH_POWER_ACTIVE; |
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if (sta->mesh->nonpeer_pm == pm) |
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return; |
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mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n", |
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sta->sta.addr, pm); |
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sta->mesh->nonpeer_pm = pm; |
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ieee80211_mps_sta_status_update(sta); |
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} |
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/** |
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* ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave |
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* |
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* @sta: STA info that transmitted the frame |
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* @hdr: IEEE 802.11 (QoS) Header |
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*/ |
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void ieee80211_mps_rx_h_sta_process(struct sta_info *sta, |
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struct ieee80211_hdr *hdr) |
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{ |
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if (is_unicast_ether_addr(hdr->addr1) && |
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ieee80211_is_data_qos(hdr->frame_control)) { |
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/* |
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* individually addressed QoS Data/Null frames contain |
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* peer link-specific PS mode towards the local STA |
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*/ |
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mps_set_sta_peer_pm(sta, hdr); |
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/* check for mesh Peer Service Period trigger frames */ |
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ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr), |
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sta, false, false); |
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} else { |
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/* |
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* can only determine non-peer PS mode |
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* (see IEEE802.11-2012 8.2.4.1.7) |
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*/ |
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mps_set_sta_nonpeer_pm(sta, hdr); |
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} |
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} |
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/* mesh PS frame release */ |
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static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp) |
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{ |
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struct ieee80211_sub_if_data *sdata = sta->sdata; |
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struct sk_buff *skb; |
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struct ieee80211_hdr *nullfunc; |
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struct ieee80211_tx_info *info; |
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u8 *qc; |
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skb = mps_qos_null_get(sta); |
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if (!skb) |
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return; |
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nullfunc = (struct ieee80211_hdr *) skb->data; |
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if (!eosp) |
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nullfunc->frame_control |= |
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cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
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/* |
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* | RSPI | EOSP | MPSP triggering | |
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* +------+------+--------------------+ |
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* | 0 | 0 | local STA is owner | |
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* | 0 | 1 | no MPSP (MPSP end) | |
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* | 1 | 0 | both STA are owner | |
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* | 1 | 1 | peer STA is owner | see IEEE802.11-2012 13.14.9.2 |
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*/ |
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qc = ieee80211_get_qos_ctl(nullfunc); |
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if (rspi) |
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qc[1] |= (IEEE80211_QOS_CTL_RSPI >> 8); |
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if (eosp) |
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qc[0] |= IEEE80211_QOS_CTL_EOSP; |
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info = IEEE80211_SKB_CB(skb); |
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info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER | |
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IEEE80211_TX_CTL_REQ_TX_STATUS; |
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mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n", |
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rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr); |
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ieee80211_tx_skb(sdata, skb); |
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} |
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/** |
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* mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed |
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* @sta: the station to handle |
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* @frames: the frame list to append to |
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* |
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* To properly end a mesh MPSP the last transmitted frame has to set the EOSP |
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* flag in the QoS Control field. In case the current tailing frame is not a |
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* QoS Data frame, append a QoS Null to carry the flag. |
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*/ |
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static void mpsp_qos_null_append(struct sta_info *sta, |
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struct sk_buff_head *frames) |
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{ |
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struct ieee80211_sub_if_data *sdata = sta->sdata; |
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struct sk_buff *new_skb, *skb = skb_peek_tail(frames); |
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
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struct ieee80211_tx_info *info; |
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if (ieee80211_is_data_qos(hdr->frame_control)) |
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return; |
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new_skb = mps_qos_null_get(sta); |
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if (!new_skb) |
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return; |
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mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n", |
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sta->sta.addr); |
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/* |
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* This frame has to be transmitted last. Assign lowest priority to |
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* make sure it cannot pass other frames when releasing multiple ACs. |
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*/ |
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new_skb->priority = 1; |
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skb_set_queue_mapping(new_skb, IEEE80211_AC_BK); |
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ieee80211_set_qos_hdr(sdata, new_skb); |
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info = IEEE80211_SKB_CB(new_skb); |
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info->control.vif = &sdata->vif; |
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info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; |
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__skb_queue_tail(frames, new_skb); |
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} |
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/** |
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* mps_frame_deliver - transmit frames during mesh powersave |
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* |
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* @sta: STA info to transmit to |
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* @n_frames: number of frames to transmit. -1 for all |
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*/ |
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static void mps_frame_deliver(struct sta_info *sta, int n_frames) |
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{ |
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struct ieee80211_local *local = sta->sdata->local; |
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int ac; |
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struct sk_buff_head frames; |
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struct sk_buff *skb; |
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bool more_data = false; |
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skb_queue_head_init(&frames); |
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/* collect frame(s) from buffers */ |
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for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { |
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while (n_frames != 0) { |
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skb = skb_dequeue(&sta->tx_filtered[ac]); |
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if (!skb) { |
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skb = skb_dequeue( |
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&sta->ps_tx_buf[ac]); |
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if (skb) |
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local->total_ps_buffered--; |
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} |
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if (!skb) |
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break; |
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n_frames--; |
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__skb_queue_tail(&frames, skb); |
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} |
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if (!skb_queue_empty(&sta->tx_filtered[ac]) || |
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!skb_queue_empty(&sta->ps_tx_buf[ac])) |
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more_data = true; |
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} |
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/* nothing to send? -> EOSP */ |
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if (skb_queue_empty(&frames)) { |
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mpsp_trigger_send(sta, false, true); |
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return; |
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} |
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/* in a MPSP make sure the last skb is a QoS Data frame */ |
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if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER)) |
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mpsp_qos_null_append(sta, &frames); |
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mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n", |
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skb_queue_len(&frames), sta->sta.addr); |
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|
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/* prepare collected frames for transmission */ |
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skb_queue_walk(&frames, skb) { |
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
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struct ieee80211_hdr *hdr = (void *) skb->data; |
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|
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/* |
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* Tell TX path to send this frame even though the |
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* STA may still remain is PS mode after this frame |
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* exchange. |
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*/ |
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info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; |
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if (more_data || !skb_queue_is_last(&frames, skb)) |
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hdr->frame_control |= |
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cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
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else |
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hdr->frame_control &= |
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cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
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if (skb_queue_is_last(&frames, skb) && |
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ieee80211_is_data_qos(hdr->frame_control)) { |
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u8 *qoshdr = ieee80211_get_qos_ctl(hdr); |
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|
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/* MPSP trigger frame ends service period */ |
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*qoshdr |= IEEE80211_QOS_CTL_EOSP; |
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info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; |
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} |
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} |
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ieee80211_add_pending_skbs(local, &frames); |
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sta_info_recalc_tim(sta); |
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} |
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|
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/** |
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* ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods |
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* |
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* @qc: QoS Control field |
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* @sta: peer to start a MPSP with |
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* @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 || !get_unaligned_le16(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); |
|
}
|
|
|