/* * Copyright 2012-2013, Marco Porsch * Copyright 2012-2013, cozybit Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include "mesh.h" #include "wme.h" /* mesh PS management */ /** * mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave */ static struct sk_buff *mps_qos_null_get(struct sta_info *sta) { struct ieee80211_sub_if_data *sdata = sta->sdata; struct ieee80211_local *local = sdata->local; struct ieee80211_hdr *nullfunc; /* use 4addr header */ struct sk_buff *skb; int size = sizeof(*nullfunc); __le16 fc; skb = dev_alloc_skb(local->hw.extra_tx_headroom + size + 2); if (!skb) return NULL; skb_reserve(skb, local->hw.extra_tx_headroom); nullfunc = (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; /* For non-assoc STA, prevent buffering or frame transmission */ if (sta->sta_state < IEEE80211_STA_ASSOC) return; /* * use peer-specific power mode if peering is established and the * peer's power mode is known */ if (sta->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); }