1 files changed, 543 insertions, 0 deletions

diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c
new file mode 100644
index 0000000000..c6fa532304
--- /dev/null
+++ b/net/mac80211/agg-rx.c
@@ -0,0 +1,543 @@
+// 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) 2018-2022 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, &params))
+		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,
+				   u16 buf_size)
+{
+	struct ieee80211_addba_ext_ie *resp;
+	u8 *pos;
+
+	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;
+
+	resp->data |= u8_encode_bits(buf_size >> IEEE80211_ADDBA_EXT_BUF_SIZE_SHIFT,
+				     IEEE80211_ADDBA_EXT_BUF_SIZE_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->vif.cfg.ap_addr, 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_encode_bits(amsdu, IEEE80211_ADDBA_PARAM_AMSDU_MASK);
+	capab |= u16_encode_bits(policy, IEEE80211_ADDBA_PARAM_POLICY_MASK);
+	capab |= u16_encode_bits(tid, IEEE80211_ADDBA_PARAM_TID_MASK);
+	capab |= u16_encode_bits(buf_size, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK);
+
+	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.deflink.he_cap.has_he && addbaext)
+		ieee80211_add_addbaext(sdata, skb, addbaext, buf_size);
+
+	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.deflink.ht_cap.ht_supported &&
+	    !sta->sta.deflink.he_cap.has_he) {
+		ht_dbg(sta->sdata,
+		       "STA %pM erroneously requests BA session on tid %d w/o HT\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.deflink.eht_cap.has_eht)
+		max_buf_size = IEEE80211_MAX_AMPDU_BUF_EHT;
+	else if (sta->sta.deflink.he_cap.has_he)
+		max_buf_size = IEEE80211_MAX_AMPDU_BUF_HE;
+	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.deflink.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 it 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, &params);
+		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, &params);
+	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 = NULL;
+	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) {
+		elems = ieee802_11_parse_elems(mgmt->u.action.u.addba_req.variable,
+					       ies_len, true, NULL);
+		if (!elems || elems->parse_error)
+			goto free;
+	}
+
+	if (sta->sta.deflink.eht_cap.has_eht && elems && elems->addba_ext_ie) {
+		u8 buf_size_1k = u8_get_bits(elems->addba_ext_ie->data,
+					     IEEE80211_ADDBA_EXT_BUF_SIZE_MASK);
+
+		buf_size |= buf_size_1k << IEEE80211_ADDBA_EXT_BUF_SIZE_SHIFT;
+	}
+
+	__ieee80211_start_rx_ba_session(sta, dialog_token, timeout,
+					start_seq_num, ba_policy, tid,
+					buf_size, true, false,
+					elems ? elems->addba_ext_ie : NULL);
+free:
+	kfree(elems);
+}
+
+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);