// SPDX-License-Identifier: GPL-2.0-only
/*
* HT handling
*
* Copyright 2003, Jouni Malinen <[email protected]>
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <[email protected]>
* Copyright 2007, Michael Wu <[email protected]>
* Copyright 2007-2010, Intel Corporation
* Copyright(c) 2015-2017 Intel Deutschland GmbH
* Copyright (C) 2018-2023 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_wiphy(sta->local->hw.wiphy);
tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid],
lockdep_is_held(&sta->local->hw.wiphy->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 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);
wiphy_work_queue(sta->local->hw.wiphy, &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);
wiphy_work_queue(sta->local->hw.wiphy, &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 = ieee80211_mgmt_ba(skb, da, sdata);
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;
lockdep_assert_wiphy(sta->local->hw.wiphy);
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);
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, ¶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);
}
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 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);
wiphy_work_queue(sta->local->hw.wiphy, &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 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);
wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work);
unlock:
rcu_read_unlock();
}
EXPORT_SYMBOL(ieee80211_rx_ba_timer_expired);
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