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![Johannes Berg](/assets/img/avatar_default.png)
The pointer here points directly into the frame, so the
access is potentially unaligned. Use get_unaligned_le16
to avoid that.
Fixes: 3f52b7e328
("mac80211: mesh power save basics")
Link: https://lore.kernel.org/r/20210920154009.3110ff75be0c.Ib6a2ff9e9cc9bc6fca50fce631ec1ce725cc926b@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
607 lines
16 KiB
C
607 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2012-2013, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de>
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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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#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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* 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(
|
|
&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 || !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);
|
|
}
|