| /* |
| * Copyright 2012-2013, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de> |
| * Copyright 2012-2013, cozybit Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include "mesh.h" |
| #include "wme.h" |
| |
| |
| /* mesh PS management */ |
| |
| /** |
| * mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave |
| */ |
| static struct sk_buff *mps_qos_null_get(struct sta_info *sta) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct ieee80211_local *local = sdata->local; |
| struct ieee80211_hdr *nullfunc; /* use 4addr header */ |
| struct sk_buff *skb; |
| int size = sizeof(*nullfunc); |
| __le16 fc; |
| |
| skb = dev_alloc_skb(local->hw.extra_tx_headroom + size + 2); |
| if (!skb) |
| return NULL; |
| skb_reserve(skb, local->hw.extra_tx_headroom); |
| |
| nullfunc = (struct ieee80211_hdr *) skb_put(skb, size); |
| fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_NULLFUNC); |
| ieee80211_fill_mesh_addresses(nullfunc, &fc, sta->sta.addr, |
| sdata->vif.addr); |
| nullfunc->frame_control = fc; |
| nullfunc->duration_id = 0; |
| nullfunc->seq_ctrl = 0; |
| /* no address resolution for this frame -> set addr 1 immediately */ |
| memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN); |
| memset(skb_put(skb, 2), 0, 2); /* append QoS control field */ |
| ieee80211_mps_set_frame_flags(sdata, sta, nullfunc); |
| |
| return skb; |
| } |
| |
| /** |
| * mps_qos_null_tx - send a QoS Null to indicate link-specific power mode |
| */ |
| static void mps_qos_null_tx(struct sta_info *sta) |
| { |
| struct sk_buff *skb; |
| |
| skb = mps_qos_null_get(sta); |
| if (!skb) |
| return; |
| |
| mps_dbg(sta->sdata, "announcing peer-specific power mode to %pM\n", |
| sta->sta.addr); |
| |
| /* don't unintentionally start a MPSP */ |
| if (!test_sta_flag(sta, WLAN_STA_PS_STA)) { |
| u8 *qc = ieee80211_get_qos_ctl((void *) skb->data); |
| |
| qc[0] |= IEEE80211_QOS_CTL_EOSP; |
| } |
| |
| ieee80211_tx_skb(sta->sdata, skb); |
| } |
| |
| /** |
| * ieee80211_mps_local_status_update - track status of local link-specific PMs |
| * |
| * @sdata: local mesh subif |
| * |
| * sets the non-peer power mode and triggers the driver PS (re-)configuration |
| * Return BSS_CHANGED_BEACON if a beacon update is necessary. |
| */ |
| u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata) |
| { |
| struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
| struct sta_info *sta; |
| bool peering = false; |
| int light_sleep_cnt = 0; |
| int deep_sleep_cnt = 0; |
| u32 changed = 0; |
| enum nl80211_mesh_power_mode nonpeer_pm; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { |
| if (sdata != sta->sdata) |
| continue; |
| |
| switch (sta->plink_state) { |
| case NL80211_PLINK_OPN_SNT: |
| case NL80211_PLINK_OPN_RCVD: |
| case NL80211_PLINK_CNF_RCVD: |
| peering = true; |
| break; |
| case NL80211_PLINK_ESTAB: |
| if (sta->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP) |
| light_sleep_cnt++; |
| else if (sta->local_pm == NL80211_MESH_POWER_DEEP_SLEEP) |
| deep_sleep_cnt++; |
| break; |
| default: |
| break; |
| } |
| } |
| rcu_read_unlock(); |
| |
| /* |
| * Set non-peer mode to active during peering/scanning/authentication |
| * (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is |
| * deep sleep if the local STA is in light or deep sleep towards at |
| * least one mesh peer (see 13.14.3.1). Otherwise, set it to the |
| * user-configured default value. |
| */ |
| if (peering) { |
| mps_dbg(sdata, "setting non-peer PM to active for peering\n"); |
| nonpeer_pm = NL80211_MESH_POWER_ACTIVE; |
| } else if (light_sleep_cnt || deep_sleep_cnt) { |
| mps_dbg(sdata, "setting non-peer PM to deep sleep\n"); |
| nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP; |
| } else { |
| mps_dbg(sdata, "setting non-peer PM to user value\n"); |
| nonpeer_pm = ifmsh->mshcfg.power_mode; |
| } |
| |
| /* need update if sleep counts move between 0 and non-zero */ |
| if (ifmsh->nonpeer_pm != nonpeer_pm || |
| !ifmsh->ps_peers_light_sleep != !light_sleep_cnt || |
| !ifmsh->ps_peers_deep_sleep != !deep_sleep_cnt) |
| changed = BSS_CHANGED_BEACON; |
| |
| ifmsh->nonpeer_pm = nonpeer_pm; |
| ifmsh->ps_peers_light_sleep = light_sleep_cnt; |
| ifmsh->ps_peers_deep_sleep = deep_sleep_cnt; |
| |
| return changed; |
| } |
| |
| /** |
| * ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA |
| * |
| * @sta: mesh STA |
| * @pm: the power mode to set |
| * Return BSS_CHANGED_BEACON if a beacon update is in order. |
| */ |
| u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta, |
| enum nl80211_mesh_power_mode pm) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| |
| mps_dbg(sdata, "local STA operates in mode %d with %pM\n", |
| pm, sta->sta.addr); |
| |
| sta->local_pm = pm; |
| |
| /* |
| * announce peer-specific power mode transition |
| * (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3) |
| */ |
| if (sta->plink_state == NL80211_PLINK_ESTAB) |
| mps_qos_null_tx(sta); |
| |
| return ieee80211_mps_local_status_update(sdata); |
| } |
| |
| /** |
| * ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control) |
| * |
| * @sdata: local mesh subif |
| * @sta: mesh STA |
| * @hdr: 802.11 frame header |
| * |
| * see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11 |
| * |
| * NOTE: sta must be given when an individually-addressed QoS frame header |
| * is handled, for group-addressed and management frames it is not used |
| */ |
| void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata, |
| struct sta_info *sta, |
| struct ieee80211_hdr *hdr) |
| { |
| enum nl80211_mesh_power_mode pm; |
| u8 *qc; |
| |
| if (WARN_ON(is_unicast_ether_addr(hdr->addr1) && |
| ieee80211_is_data_qos(hdr->frame_control) && |
| !sta)) |
| return; |
| |
| if (is_unicast_ether_addr(hdr->addr1) && |
| ieee80211_is_data_qos(hdr->frame_control) && |
| sta->plink_state == NL80211_PLINK_ESTAB) |
| pm = sta->local_pm; |
| else |
| pm = sdata->u.mesh.nonpeer_pm; |
| |
| if (pm == NL80211_MESH_POWER_ACTIVE) |
| hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM); |
| else |
| hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); |
| |
| if (!ieee80211_is_data_qos(hdr->frame_control)) |
| return; |
| |
| qc = ieee80211_get_qos_ctl(hdr); |
| |
| if ((is_unicast_ether_addr(hdr->addr1) && |
| pm == NL80211_MESH_POWER_DEEP_SLEEP) || |
| (is_multicast_ether_addr(hdr->addr1) && |
| sdata->u.mesh.ps_peers_deep_sleep > 0)) |
| qc[1] |= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8); |
| else |
| qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8); |
| } |
| |
| /** |
| * ieee80211_mps_sta_status_update - update buffering status of neighbor STA |
| * |
| * @sta: mesh STA |
| * |
| * called after change of peering status or non-peer/peer-specific power mode |
| */ |
| void ieee80211_mps_sta_status_update(struct sta_info *sta) |
| { |
| enum nl80211_mesh_power_mode pm; |
| bool do_buffer; |
| |
| /* |
| * use peer-specific power mode if peering is established and the |
| * peer's power mode is known |
| */ |
| if (sta->plink_state == NL80211_PLINK_ESTAB && |
| sta->peer_pm != NL80211_MESH_POWER_UNKNOWN) |
| pm = sta->peer_pm; |
| else |
| pm = sta->nonpeer_pm; |
| |
| do_buffer = (pm != NL80211_MESH_POWER_ACTIVE); |
| |
| /* 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); |
| } |
| |
| /* clear the MPSP flags for non-peers or active STA */ |
| if (sta->plink_state != NL80211_PLINK_ESTAB) { |
| clear_sta_flag(sta, WLAN_STA_MPSP_OWNER); |
| clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); |
| } else if (!do_buffer) { |
| clear_sta_flag(sta, WLAN_STA_MPSP_OWNER); |
| } |
| } |
| |
| static void mps_set_sta_peer_pm(struct sta_info *sta, |
| struct ieee80211_hdr *hdr) |
| { |
| enum nl80211_mesh_power_mode pm; |
| u8 *qc = ieee80211_get_qos_ctl(hdr); |
| |
| /* |
| * Test Power Management field of frame control (PW) and |
| * mesh power save level subfield of QoS control field (PSL) |
| * |
| * | PM | PSL| Mesh PM | |
| * +----+----+---------+ |
| * | 0 |Rsrv| Active | |
| * | 1 | 0 | Light | |
| * | 1 | 1 | Deep | |
| */ |
| if (ieee80211_has_pm(hdr->frame_control)) { |
| if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8)) |
| pm = NL80211_MESH_POWER_DEEP_SLEEP; |
| else |
| pm = NL80211_MESH_POWER_LIGHT_SLEEP; |
| } else { |
| pm = NL80211_MESH_POWER_ACTIVE; |
| } |
| |
| if (sta->peer_pm == pm) |
| return; |
| |
| mps_dbg(sta->sdata, "STA %pM enters mode %d\n", |
| sta->sta.addr, pm); |
| |
| sta->peer_pm = pm; |
| |
| ieee80211_mps_sta_status_update(sta); |
| } |
| |
| static void mps_set_sta_nonpeer_pm(struct sta_info *sta, |
| struct ieee80211_hdr *hdr) |
| { |
| enum nl80211_mesh_power_mode pm; |
| |
| if (ieee80211_has_pm(hdr->frame_control)) |
| pm = NL80211_MESH_POWER_DEEP_SLEEP; |
| else |
| pm = NL80211_MESH_POWER_ACTIVE; |
| |
| if (sta->nonpeer_pm == pm) |
| return; |
| |
| mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n", |
| sta->sta.addr, pm); |
| |
| sta->nonpeer_pm = pm; |
| |
| ieee80211_mps_sta_status_update(sta); |
| } |
| |
| /** |
| * ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave |
| * |
| * @sta: STA info that transmitted the frame |
| * @hdr: IEEE 802.11 (QoS) Header |
| */ |
| void ieee80211_mps_rx_h_sta_process(struct sta_info *sta, |
| struct ieee80211_hdr *hdr) |
| { |
| if (is_unicast_ether_addr(hdr->addr1) && |
| ieee80211_is_data_qos(hdr->frame_control)) { |
| /* |
| * individually addressed QoS Data/Null frames contain |
| * peer link-specific PS mode towards the local STA |
| */ |
| mps_set_sta_peer_pm(sta, hdr); |
| |
| /* check for mesh Peer Service Period trigger frames */ |
| ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr), |
| sta, false, false); |
| } else { |
| /* |
| * can only determine non-peer PS mode |
| * (see IEEE802.11-2012 8.2.4.1.7) |
| */ |
| mps_set_sta_nonpeer_pm(sta, hdr); |
| } |
| } |
| |
| |
| /* mesh PS frame release */ |
| |
| static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct sk_buff *skb; |
| struct ieee80211_hdr *nullfunc; |
| struct ieee80211_tx_info *info; |
| u8 *qc; |
| |
| skb = mps_qos_null_get(sta); |
| if (!skb) |
| return; |
| |
| nullfunc = (struct ieee80211_hdr *) skb->data; |
| if (!eosp) |
| nullfunc->frame_control |= |
| cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
| /* |
| * | RSPI | EOSP | MPSP triggering | |
| * +------+------+--------------------+ |
| * | 0 | 0 | local STA is owner | |
| * | 0 | 1 | no MPSP (MPSP end) | |
| * | 1 | 0 | both STA are owner | |
| * | 1 | 1 | peer STA is owner | see IEEE802.11-2012 13.14.9.2 |
| */ |
| qc = ieee80211_get_qos_ctl(nullfunc); |
| if (rspi) |
| qc[1] |= (IEEE80211_QOS_CTL_RSPI >> 8); |
| if (eosp) |
| qc[0] |= IEEE80211_QOS_CTL_EOSP; |
| |
| info = IEEE80211_SKB_CB(skb); |
| |
| info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER | |
| IEEE80211_TX_CTL_REQ_TX_STATUS; |
| |
| mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n", |
| rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr); |
| |
| ieee80211_tx_skb(sdata, skb); |
| } |
| |
| /** |
| * mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed |
| * |
| * To properly end a mesh MPSP the last transmitted frame has to set the EOSP |
| * flag in the QoS Control field. In case the current tailing frame is not a |
| * QoS Data frame, append a QoS Null to carry the flag. |
| */ |
| static void mpsp_qos_null_append(struct sta_info *sta, |
| struct sk_buff_head *frames) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct sk_buff *new_skb, *skb = skb_peek_tail(frames); |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| struct ieee80211_tx_info *info; |
| |
| if (ieee80211_is_data_qos(hdr->frame_control)) |
| return; |
| |
| new_skb = mps_qos_null_get(sta); |
| if (!new_skb) |
| return; |
| |
| mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n", |
| sta->sta.addr); |
| /* |
| * This frame has to be transmitted last. Assign lowest priority to |
| * make sure it cannot pass other frames when releasing multiple ACs. |
| */ |
| new_skb->priority = 1; |
| skb_set_queue_mapping(new_skb, IEEE80211_AC_BK); |
| ieee80211_set_qos_hdr(sdata, new_skb); |
| |
| info = IEEE80211_SKB_CB(new_skb); |
| info->control.vif = &sdata->vif; |
| info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
| |
| __skb_queue_tail(frames, new_skb); |
| } |
| |
| /** |
| * mps_frame_deliver - transmit frames during mesh powersave |
| * |
| * @sta: STA info to transmit to |
| * @n_frames: number of frames to transmit. -1 for all |
| */ |
| static void mps_frame_deliver(struct sta_info *sta, int n_frames) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct ieee80211_local *local = sdata->local; |
| int ac; |
| struct sk_buff_head frames; |
| struct sk_buff *skb; |
| bool more_data = false; |
| |
| skb_queue_head_init(&frames); |
| |
| /* collect frame(s) from buffers */ |
| for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { |
| while (n_frames != 0) { |
| skb = skb_dequeue(&sta->tx_filtered[ac]); |
| if (!skb) { |
| skb = skb_dequeue( |
| &sta->ps_tx_buf[ac]); |
| if (skb) |
| local->total_ps_buffered--; |
| } |
| if (!skb) |
| break; |
| n_frames--; |
| __skb_queue_tail(&frames, skb); |
| } |
| |
| if (!skb_queue_empty(&sta->tx_filtered[ac]) || |
| !skb_queue_empty(&sta->ps_tx_buf[ac])) |
| more_data = true; |
| } |
| |
| /* nothing to send? -> EOSP */ |
| if (skb_queue_empty(&frames)) { |
| mpsp_trigger_send(sta, false, true); |
| return; |
| } |
| |
| /* in a MPSP make sure the last skb is a QoS Data frame */ |
| if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER)) |
| mpsp_qos_null_append(sta, &frames); |
| |
| mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n", |
| skb_queue_len(&frames), sta->sta.addr); |
| |
| /* prepare collected frames for transmission */ |
| skb_queue_walk(&frames, skb) { |
| struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| struct ieee80211_hdr *hdr = (void *) skb->data; |
| |
| /* |
| * Tell TX path to send this frame even though the |
| * STA may still remain is PS mode after this frame |
| * exchange. |
| */ |
| info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; |
| |
| if (more_data || !skb_queue_is_last(&frames, skb)) |
| hdr->frame_control |= |
| cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
| else |
| hdr->frame_control &= |
| cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
| |
| if (skb_queue_is_last(&frames, skb) && |
| ieee80211_is_data_qos(hdr->frame_control)) { |
| u8 *qoshdr = ieee80211_get_qos_ctl(hdr); |
| |
| /* MPSP trigger frame ends service period */ |
| *qoshdr |= IEEE80211_QOS_CTL_EOSP; |
| info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; |
| } |
| } |
| |
| ieee80211_add_pending_skbs(local, &frames); |
| sta_info_recalc_tim(sta); |
| } |
| |
| /** |
| * ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods |
| * |
| * @qc: QoS Control field |
| * @sta: peer to start a MPSP with |
| * @tx: frame was transmitted by the local STA |
| * @acked: frame has been transmitted successfully |
| * |
| * NOTE: active mode STA may only serve as MPSP owner |
| */ |
| void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta, |
| bool tx, bool acked) |
| { |
| u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8); |
| u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP; |
| |
| if (tx) { |
| if (rspi && acked) |
| set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); |
| |
| if (eosp) |
| clear_sta_flag(sta, WLAN_STA_MPSP_OWNER); |
| else if (acked && |
| test_sta_flag(sta, WLAN_STA_PS_STA) && |
| !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER)) |
| mps_frame_deliver(sta, -1); |
| } else { |
| if (eosp) |
| clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); |
| else if (sta->local_pm != NL80211_MESH_POWER_ACTIVE) |
| set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); |
| |
| if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER)) |
| mps_frame_deliver(sta, -1); |
| } |
| } |
| |
| /** |
| * ieee80211_mps_frame_release - release buffered frames in response to beacon |
| * |
| * @sta: mesh STA |
| * @elems: beacon IEs |
| * |
| * For peers if we have individually-addressed frames buffered or the peer |
| * indicates buffered frames, send a corresponding MPSP trigger frame. Since |
| * we do not evaluate the awake window duration, QoS Nulls are used as MPSP |
| * trigger frames. If the neighbour STA is not a peer, only send single frames. |
| */ |
| void ieee80211_mps_frame_release(struct sta_info *sta, |
| struct ieee802_11_elems *elems) |
| { |
| int ac, buffer_local = 0; |
| bool has_buffered = false; |
| |
| /* TIM map only for LLID <= IEEE80211_MAX_AID */ |
| if (sta->plink_state == NL80211_PLINK_ESTAB) |
| has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len, |
| le16_to_cpu(sta->llid) % IEEE80211_MAX_AID); |
| |
| if (has_buffered) |
| mps_dbg(sta->sdata, "%pM indicates buffered frames\n", |
| sta->sta.addr); |
| |
| /* only transmit to PS STA with announced, non-zero awake window */ |
| if (test_sta_flag(sta, WLAN_STA_PS_STA) && |
| (!elems->awake_window || !le16_to_cpu(*elems->awake_window))) |
| return; |
| |
| for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) |
| buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) + |
| skb_queue_len(&sta->tx_filtered[ac]); |
| |
| if (!has_buffered && !buffer_local) |
| return; |
| |
| if (sta->plink_state == NL80211_PLINK_ESTAB) |
| mpsp_trigger_send(sta, has_buffered, !buffer_local); |
| else |
| mps_frame_deliver(sta, 1); |
| } |