| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * HT handling |
| * |
| * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> |
| * Copyright 2002-2005, Instant802 Networks, Inc. |
| * Copyright 2005-2006, Devicescape Software, Inc. |
| * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| * Copyright 2007, Michael Wu <flamingice@sourmilk.net> |
| * Copyright 2007-2010, Intel Corporation |
| * Copyright(c) 2015-2017 Intel Deutschland GmbH |
| * Copyright (C) 2018-2020 Intel Corporation |
| */ |
| |
| /** |
| * DOC: RX A-MPDU aggregation |
| * |
| * Aggregation on the RX side requires only implementing the |
| * @ampdu_action callback that is invoked to start/stop any |
| * block-ack sessions for RX aggregation. |
| * |
| * When RX aggregation is started by the peer, the driver is |
| * notified via @ampdu_action function, with the |
| * %IEEE80211_AMPDU_RX_START action, and may reject the request |
| * in which case a negative response is sent to the peer, if it |
| * accepts it a positive response is sent. |
| * |
| * While the session is active, the device/driver are required |
| * to de-aggregate frames and pass them up one by one to mac80211, |
| * which will handle the reorder buffer. |
| * |
| * When the aggregation session is stopped again by the peer or |
| * ourselves, the driver's @ampdu_action function will be called |
| * with the action %IEEE80211_AMPDU_RX_STOP. In this case, the |
| * call must not fail. |
| */ |
| |
| #include <linux/ieee80211.h> |
| #include <linux/slab.h> |
| #include <linux/export.h> |
| #include <net/mac80211.h> |
| #include "ieee80211_i.h" |
| #include "driver-ops.h" |
| |
| static void ieee80211_free_tid_rx(struct rcu_head *h) |
| { |
| struct tid_ampdu_rx *tid_rx = |
| container_of(h, struct tid_ampdu_rx, rcu_head); |
| int i; |
| |
| for (i = 0; i < tid_rx->buf_size; i++) |
| __skb_queue_purge(&tid_rx->reorder_buf[i]); |
| kfree(tid_rx->reorder_buf); |
| kfree(tid_rx->reorder_time); |
| kfree(tid_rx); |
| } |
| |
| void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, |
| u16 initiator, u16 reason, bool tx) |
| { |
| struct ieee80211_local *local = sta->local; |
| struct tid_ampdu_rx *tid_rx; |
| struct ieee80211_ampdu_params params = { |
| .sta = &sta->sta, |
| .action = IEEE80211_AMPDU_RX_STOP, |
| .tid = tid, |
| .amsdu = false, |
| .timeout = 0, |
| .ssn = 0, |
| }; |
| |
| lockdep_assert_held(&sta->ampdu_mlme.mtx); |
| |
| tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid], |
| lockdep_is_held(&sta->ampdu_mlme.mtx)); |
| |
| if (!test_bit(tid, sta->ampdu_mlme.agg_session_valid)) |
| return; |
| |
| RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL); |
| __clear_bit(tid, sta->ampdu_mlme.agg_session_valid); |
| |
| ht_dbg(sta->sdata, |
| "Rx BA session stop requested for %pM tid %u %s reason: %d\n", |
| sta->sta.addr, tid, |
| initiator == WLAN_BACK_RECIPIENT ? "recipient" : "initiator", |
| (int)reason); |
| |
| if (drv_ampdu_action(local, sta->sdata, ¶ms)) |
| sdata_info(sta->sdata, |
| "HW problem - can not stop rx aggregation for %pM tid %d\n", |
| sta->sta.addr, tid); |
| |
| /* check if this is a self generated aggregation halt */ |
| if (initiator == WLAN_BACK_RECIPIENT && tx) |
| ieee80211_send_delba(sta->sdata, sta->sta.addr, |
| tid, WLAN_BACK_RECIPIENT, reason); |
| |
| /* |
| * return here in case tid_rx is not assigned - which will happen if |
| * IEEE80211_HW_SUPPORTS_REORDERING_BUFFER is set. |
| */ |
| if (!tid_rx) |
| return; |
| |
| del_timer_sync(&tid_rx->session_timer); |
| |
| /* make sure ieee80211_sta_reorder_release() doesn't re-arm the timer */ |
| spin_lock_bh(&tid_rx->reorder_lock); |
| tid_rx->removed = true; |
| spin_unlock_bh(&tid_rx->reorder_lock); |
| del_timer_sync(&tid_rx->reorder_timer); |
| |
| call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx); |
| } |
| |
| void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, |
| u16 initiator, u16 reason, bool tx) |
| { |
| mutex_lock(&sta->ampdu_mlme.mtx); |
| ___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx); |
| mutex_unlock(&sta->ampdu_mlme.mtx); |
| } |
| |
| void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap, |
| const u8 *addr) |
| { |
| struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| struct sta_info *sta; |
| int i; |
| |
| rcu_read_lock(); |
| sta = sta_info_get_bss(sdata, addr); |
| if (!sta) { |
| rcu_read_unlock(); |
| return; |
| } |
| |
| for (i = 0; i < IEEE80211_NUM_TIDS; i++) |
| if (ba_rx_bitmap & BIT(i)) |
| set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested); |
| |
| ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work); |
| rcu_read_unlock(); |
| } |
| EXPORT_SYMBOL(ieee80211_stop_rx_ba_session); |
| |
| /* |
| * After accepting the AddBA Request we activated a timer, |
| * resetting it after each frame that arrives from the originator. |
| */ |
| static void sta_rx_agg_session_timer_expired(struct timer_list *t) |
| { |
| struct tid_ampdu_rx *tid_rx = from_timer(tid_rx, t, session_timer); |
| struct sta_info *sta = tid_rx->sta; |
| u8 tid = tid_rx->tid; |
| unsigned long timeout; |
| |
| timeout = tid_rx->last_rx + TU_TO_JIFFIES(tid_rx->timeout); |
| if (time_is_after_jiffies(timeout)) { |
| mod_timer(&tid_rx->session_timer, timeout); |
| return; |
| } |
| |
| ht_dbg(sta->sdata, "RX session timer expired on %pM tid %d\n", |
| sta->sta.addr, tid); |
| |
| set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired); |
| ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work); |
| } |
| |
| static void sta_rx_agg_reorder_timer_expired(struct timer_list *t) |
| { |
| struct tid_ampdu_rx *tid_rx = from_timer(tid_rx, t, reorder_timer); |
| |
| rcu_read_lock(); |
| ieee80211_release_reorder_timeout(tid_rx->sta, tid_rx->tid); |
| rcu_read_unlock(); |
| } |
| |
| static void ieee80211_add_addbaext(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb, |
| const struct ieee80211_addba_ext_ie *req) |
| { |
| struct ieee80211_supported_band *sband; |
| struct ieee80211_addba_ext_ie *resp; |
| const struct ieee80211_sta_he_cap *he_cap; |
| u8 frag_level, cap_frag_level; |
| u8 *pos; |
| |
| sband = ieee80211_get_sband(sdata); |
| if (!sband) |
| return; |
| he_cap = ieee80211_get_he_iftype_cap(sband, sdata->vif.type); |
| if (!he_cap) |
| return; |
| |
| pos = skb_put_zero(skb, 2 + sizeof(struct ieee80211_addba_ext_ie)); |
| *pos++ = WLAN_EID_ADDBA_EXT; |
| *pos++ = sizeof(struct ieee80211_addba_ext_ie); |
| resp = (struct ieee80211_addba_ext_ie *)pos; |
| resp->data = req->data & IEEE80211_ADDBA_EXT_NO_FRAG; |
| |
| frag_level = u32_get_bits(req->data, |
| IEEE80211_ADDBA_EXT_FRAG_LEVEL_MASK); |
| cap_frag_level = u32_get_bits(he_cap->he_cap_elem.mac_cap_info[0], |
| IEEE80211_HE_MAC_CAP0_DYNAMIC_FRAG_MASK); |
| if (frag_level > cap_frag_level) |
| frag_level = cap_frag_level; |
| resp->data |= u8_encode_bits(frag_level, |
| IEEE80211_ADDBA_EXT_FRAG_LEVEL_MASK); |
| } |
| |
| static void ieee80211_send_addba_resp(struct sta_info *sta, u8 *da, u16 tid, |
| u8 dialog_token, u16 status, u16 policy, |
| u16 buf_size, u16 timeout, |
| const struct ieee80211_addba_ext_ie *addbaext) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct ieee80211_local *local = sdata->local; |
| struct sk_buff *skb; |
| struct ieee80211_mgmt *mgmt; |
| bool amsdu = ieee80211_hw_check(&local->hw, SUPPORTS_AMSDU_IN_AMPDU); |
| u16 capab; |
| |
| skb = dev_alloc_skb(sizeof(*mgmt) + |
| 2 + sizeof(struct ieee80211_addba_ext_ie) + |
| local->hw.extra_tx_headroom); |
| if (!skb) |
| return; |
| |
| skb_reserve(skb, local->hw.extra_tx_headroom); |
| mgmt = skb_put_zero(skb, 24); |
| memcpy(mgmt->da, da, ETH_ALEN); |
| memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
| if (sdata->vif.type == NL80211_IFTYPE_AP || |
| sdata->vif.type == NL80211_IFTYPE_AP_VLAN || |
| sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
| memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
| else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
| memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
| else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
| memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); |
| |
| mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| IEEE80211_STYPE_ACTION); |
| |
| skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); |
| mgmt->u.action.category = WLAN_CATEGORY_BACK; |
| mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; |
| mgmt->u.action.u.addba_resp.dialog_token = dialog_token; |
| |
| capab = (u16)(amsdu << 0); /* bit 0 A-MSDU support */ |
| capab |= (u16)(policy << 1); /* bit 1 aggregation policy */ |
| capab |= (u16)(tid << 2); /* bit 5:2 TID number */ |
| capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */ |
| |
| mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); |
| mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); |
| mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); |
| |
| if (sta->sta.he_cap.has_he && addbaext) |
| ieee80211_add_addbaext(sdata, skb, addbaext); |
| |
| ieee80211_tx_skb(sdata, skb); |
| } |
| |
| void ___ieee80211_start_rx_ba_session(struct sta_info *sta, |
| u8 dialog_token, u16 timeout, |
| u16 start_seq_num, u16 ba_policy, u16 tid, |
| u16 buf_size, bool tx, bool auto_seq, |
| const struct ieee80211_addba_ext_ie *addbaext) |
| { |
| struct ieee80211_local *local = sta->sdata->local; |
| struct tid_ampdu_rx *tid_agg_rx; |
| struct ieee80211_ampdu_params params = { |
| .sta = &sta->sta, |
| .action = IEEE80211_AMPDU_RX_START, |
| .tid = tid, |
| .amsdu = false, |
| .timeout = timeout, |
| .ssn = start_seq_num, |
| }; |
| int i, ret = -EOPNOTSUPP; |
| u16 status = WLAN_STATUS_REQUEST_DECLINED; |
| u16 max_buf_size; |
| |
| if (tid >= IEEE80211_FIRST_TSPEC_TSID) { |
| ht_dbg(sta->sdata, |
| "STA %pM requests BA session on unsupported tid %d\n", |
| sta->sta.addr, tid); |
| goto end; |
| } |
| |
| if (!sta->sta.ht_cap.ht_supported && |
| sta->sdata->vif.bss_conf.chandef.chan->band != NL80211_BAND_6GHZ) { |
| ht_dbg(sta->sdata, |
| "STA %pM erroneously requests BA session on tid %d w/o QoS\n", |
| sta->sta.addr, tid); |
| /* send a response anyway, it's an error case if we get here */ |
| goto end; |
| } |
| |
| if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
| ht_dbg(sta->sdata, |
| "Suspend in progress - Denying ADDBA request (%pM tid %d)\n", |
| sta->sta.addr, tid); |
| goto end; |
| } |
| |
| if (sta->sta.he_cap.has_he) |
| max_buf_size = IEEE80211_MAX_AMPDU_BUF; |
| else |
| max_buf_size = IEEE80211_MAX_AMPDU_BUF_HT; |
| |
| /* sanity check for incoming parameters: |
| * check if configuration can support the BA policy |
| * and if buffer size does not exceeds max value */ |
| /* XXX: check own ht delayed BA capability?? */ |
| if (((ba_policy != 1) && |
| (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) || |
| (buf_size > max_buf_size)) { |
| status = WLAN_STATUS_INVALID_QOS_PARAM; |
| ht_dbg_ratelimited(sta->sdata, |
| "AddBA Req with bad params from %pM on tid %u. policy %d, buffer size %d\n", |
| sta->sta.addr, tid, ba_policy, buf_size); |
| goto end; |
| } |
| /* determine default buffer size */ |
| if (buf_size == 0) |
| buf_size = max_buf_size; |
| |
| /* make sure the size doesn't exceed the maximum supported by the hw */ |
| if (buf_size > sta->sta.max_rx_aggregation_subframes) |
| buf_size = sta->sta.max_rx_aggregation_subframes; |
| params.buf_size = buf_size; |
| |
| ht_dbg(sta->sdata, "AddBA Req buf_size=%d for %pM\n", |
| buf_size, sta->sta.addr); |
| |
| /* examine state machine */ |
| lockdep_assert_held(&sta->ampdu_mlme.mtx); |
| |
| if (test_bit(tid, sta->ampdu_mlme.agg_session_valid)) { |
| if (sta->ampdu_mlme.tid_rx_token[tid] == dialog_token) { |
| struct tid_ampdu_rx *tid_rx; |
| |
| ht_dbg_ratelimited(sta->sdata, |
| "updated AddBA Req from %pM on tid %u\n", |
| sta->sta.addr, tid); |
| /* We have no API to update the timeout value in the |
| * driver so reject the timeout update if the timeout |
| * changed. If if did not change, i.e., no real update, |
| * just reply with success. |
| */ |
| rcu_read_lock(); |
| tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); |
| if (tid_rx && tid_rx->timeout == timeout) |
| status = WLAN_STATUS_SUCCESS; |
| else |
| status = WLAN_STATUS_REQUEST_DECLINED; |
| rcu_read_unlock(); |
| goto end; |
| } |
| |
| ht_dbg_ratelimited(sta->sdata, |
| "unexpected AddBA Req from %pM on tid %u\n", |
| sta->sta.addr, tid); |
| |
| /* delete existing Rx BA session on the same tid */ |
| ___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, |
| WLAN_STATUS_UNSPECIFIED_QOS, |
| false); |
| } |
| |
| if (ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) { |
| ret = drv_ampdu_action(local, sta->sdata, ¶ms); |
| ht_dbg(sta->sdata, |
| "Rx A-MPDU request on %pM tid %d result %d\n", |
| sta->sta.addr, tid, ret); |
| if (!ret) |
| status = WLAN_STATUS_SUCCESS; |
| goto end; |
| } |
| |
| /* prepare A-MPDU MLME for Rx aggregation */ |
| tid_agg_rx = kzalloc(sizeof(*tid_agg_rx), GFP_KERNEL); |
| if (!tid_agg_rx) |
| goto end; |
| |
| spin_lock_init(&tid_agg_rx->reorder_lock); |
| |
| /* rx timer */ |
| timer_setup(&tid_agg_rx->session_timer, |
| sta_rx_agg_session_timer_expired, TIMER_DEFERRABLE); |
| |
| /* rx reorder timer */ |
| timer_setup(&tid_agg_rx->reorder_timer, |
| sta_rx_agg_reorder_timer_expired, 0); |
| |
| /* prepare reordering buffer */ |
| tid_agg_rx->reorder_buf = |
| kcalloc(buf_size, sizeof(struct sk_buff_head), GFP_KERNEL); |
| tid_agg_rx->reorder_time = |
| kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL); |
| if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) { |
| kfree(tid_agg_rx->reorder_buf); |
| kfree(tid_agg_rx->reorder_time); |
| kfree(tid_agg_rx); |
| goto end; |
| } |
| |
| for (i = 0; i < buf_size; i++) |
| __skb_queue_head_init(&tid_agg_rx->reorder_buf[i]); |
| |
| ret = drv_ampdu_action(local, sta->sdata, ¶ms); |
| ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n", |
| sta->sta.addr, tid, ret); |
| if (ret) { |
| kfree(tid_agg_rx->reorder_buf); |
| kfree(tid_agg_rx->reorder_time); |
| kfree(tid_agg_rx); |
| goto end; |
| } |
| |
| /* update data */ |
| tid_agg_rx->ssn = start_seq_num; |
| tid_agg_rx->head_seq_num = start_seq_num; |
| tid_agg_rx->buf_size = buf_size; |
| tid_agg_rx->timeout = timeout; |
| tid_agg_rx->stored_mpdu_num = 0; |
| tid_agg_rx->auto_seq = auto_seq; |
| tid_agg_rx->started = false; |
| tid_agg_rx->reorder_buf_filtered = 0; |
| tid_agg_rx->tid = tid; |
| tid_agg_rx->sta = sta; |
| status = WLAN_STATUS_SUCCESS; |
| |
| /* activate it for RX */ |
| rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx); |
| |
| if (timeout) { |
| mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout)); |
| tid_agg_rx->last_rx = jiffies; |
| } |
| |
| end: |
| if (status == WLAN_STATUS_SUCCESS) { |
| __set_bit(tid, sta->ampdu_mlme.agg_session_valid); |
| __clear_bit(tid, sta->ampdu_mlme.unexpected_agg); |
| sta->ampdu_mlme.tid_rx_token[tid] = dialog_token; |
| } |
| |
| if (tx) |
| ieee80211_send_addba_resp(sta, sta->sta.addr, tid, |
| dialog_token, status, 1, buf_size, |
| timeout, addbaext); |
| } |
| |
| static void __ieee80211_start_rx_ba_session(struct sta_info *sta, |
| u8 dialog_token, u16 timeout, |
| u16 start_seq_num, u16 ba_policy, |
| u16 tid, u16 buf_size, bool tx, |
| bool auto_seq, |
| const struct ieee80211_addba_ext_ie *addbaext) |
| { |
| mutex_lock(&sta->ampdu_mlme.mtx); |
| ___ieee80211_start_rx_ba_session(sta, dialog_token, timeout, |
| start_seq_num, ba_policy, tid, |
| buf_size, tx, auto_seq, addbaext); |
| mutex_unlock(&sta->ampdu_mlme.mtx); |
| } |
| |
| void ieee80211_process_addba_request(struct ieee80211_local *local, |
| struct sta_info *sta, |
| struct ieee80211_mgmt *mgmt, |
| size_t len) |
| { |
| u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num; |
| struct ieee802_11_elems elems = { }; |
| u8 dialog_token; |
| int ies_len; |
| |
| /* extract session parameters from addba request frame */ |
| dialog_token = mgmt->u.action.u.addba_req.dialog_token; |
| timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); |
| start_seq_num = |
| le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; |
| |
| capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); |
| ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; |
| tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; |
| buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
| |
| ies_len = len - offsetof(struct ieee80211_mgmt, |
| u.action.u.addba_req.variable); |
| if (ies_len) { |
| ieee802_11_parse_elems(mgmt->u.action.u.addba_req.variable, |
| ies_len, true, &elems, mgmt->bssid, NULL); |
| if (elems.parse_error) |
| return; |
| } |
| |
| __ieee80211_start_rx_ba_session(sta, dialog_token, timeout, |
| start_seq_num, ba_policy, tid, |
| buf_size, true, false, |
| elems.addba_ext_ie); |
| } |
| |
| void ieee80211_manage_rx_ba_offl(struct ieee80211_vif *vif, |
| const u8 *addr, unsigned int tid) |
| { |
| struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| |
| rcu_read_lock(); |
| sta = sta_info_get_bss(sdata, addr); |
| if (!sta) |
| goto unlock; |
| |
| set_bit(tid, sta->ampdu_mlme.tid_rx_manage_offl); |
| ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
| unlock: |
| rcu_read_unlock(); |
| } |
| EXPORT_SYMBOL(ieee80211_manage_rx_ba_offl); |
| |
| void ieee80211_rx_ba_timer_expired(struct ieee80211_vif *vif, |
| const u8 *addr, unsigned int tid) |
| { |
| struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| |
| rcu_read_lock(); |
| sta = sta_info_get_bss(sdata, addr); |
| if (!sta) |
| goto unlock; |
| |
| set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired); |
| ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
| |
| unlock: |
| rcu_read_unlock(); |
| } |
| EXPORT_SYMBOL(ieee80211_rx_ba_timer_expired); |