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tegrakernel/kernel/kernel-4.9/drivers/net/wireless/intel/iwlwifi/mvm/tdls.c

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/******************************************************************************
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2014 Intel Mobile Communications GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
* USA
*
* The full GNU General Public License is included in this distribution
* in the file called COPYING.
*
* Contact Information:
* Intel Linux Wireless <linuxwifi@intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
* BSD LICENSE
*
* Copyright(c) 2014 Intel Mobile Communications GmbH
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*****************************************************************************/
#include <linux/etherdevice.h>
#include "mvm.h"
#include "time-event.h"
#include "iwl-io.h"
#include "iwl-prph.h"
#define TU_TO_US(x) (x * 1024)
#define TU_TO_MS(x) (TU_TO_US(x) / 1000)
void iwl_mvm_teardown_tdls_peers(struct iwl_mvm *mvm)
{
struct ieee80211_sta *sta;
struct iwl_mvm_sta *mvmsta;
int i;
lockdep_assert_held(&mvm->mutex);
for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
lockdep_is_held(&mvm->mutex));
if (!sta || IS_ERR(sta) || !sta->tdls)
continue;
mvmsta = iwl_mvm_sta_from_mac80211(sta);
ieee80211_tdls_oper_request(mvmsta->vif, sta->addr,
NL80211_TDLS_TEARDOWN,
WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED,
GFP_KERNEL);
}
}
int iwl_mvm_tdls_sta_count(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
struct ieee80211_sta *sta;
struct iwl_mvm_sta *mvmsta;
int count = 0;
int i;
lockdep_assert_held(&mvm->mutex);
for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
lockdep_is_held(&mvm->mutex));
if (!sta || IS_ERR(sta) || !sta->tdls)
continue;
if (vif) {
mvmsta = iwl_mvm_sta_from_mac80211(sta);
if (mvmsta->vif != vif)
continue;
}
count++;
}
return count;
}
static void iwl_mvm_tdls_config(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
struct iwl_rx_packet *pkt;
struct iwl_tdls_config_res *resp;
struct iwl_tdls_config_cmd tdls_cfg_cmd = {};
struct iwl_host_cmd cmd = {
.id = TDLS_CONFIG_CMD,
.flags = CMD_WANT_SKB,
.data = { &tdls_cfg_cmd, },
.len = { sizeof(struct iwl_tdls_config_cmd), },
};
struct ieee80211_sta *sta;
int ret, i, cnt;
struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
lockdep_assert_held(&mvm->mutex);
tdls_cfg_cmd.id_and_color =
cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
tdls_cfg_cmd.tx_to_ap_tid = IWL_MVM_TDLS_FW_TID;
tdls_cfg_cmd.tx_to_ap_ssn = cpu_to_le16(0); /* not used for now */
/* for now the Tx cmd is empty and unused */
/* populate TDLS peer data */
cnt = 0;
for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
lockdep_is_held(&mvm->mutex));
if (IS_ERR_OR_NULL(sta) || !sta->tdls)
continue;
tdls_cfg_cmd.sta_info[cnt].sta_id = i;
tdls_cfg_cmd.sta_info[cnt].tx_to_peer_tid =
IWL_MVM_TDLS_FW_TID;
tdls_cfg_cmd.sta_info[cnt].tx_to_peer_ssn = cpu_to_le16(0);
tdls_cfg_cmd.sta_info[cnt].is_initiator =
cpu_to_le32(sta->tdls_initiator ? 1 : 0);
cnt++;
}
tdls_cfg_cmd.tdls_peer_count = cnt;
IWL_DEBUG_TDLS(mvm, "send TDLS config to FW for %d peers\n", cnt);
ret = iwl_mvm_send_cmd(mvm, &cmd);
if (WARN_ON_ONCE(ret))
return;
pkt = cmd.resp_pkt;
WARN_ON_ONCE(iwl_rx_packet_payload_len(pkt) != sizeof(*resp));
/* we don't really care about the response at this point */
iwl_free_resp(&cmd);
}
void iwl_mvm_recalc_tdls_state(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
bool sta_added)
{
int tdls_sta_cnt = iwl_mvm_tdls_sta_count(mvm, vif);
/* when the first peer joins, send a power update first */
if (tdls_sta_cnt == 1 && sta_added)
iwl_mvm_power_update_mac(mvm);
/* configure the FW with TDLS peer info */
iwl_mvm_tdls_config(mvm, vif);
/* when the last peer leaves, send a power update last */
if (tdls_sta_cnt == 0 && !sta_added)
iwl_mvm_power_update_mac(mvm);
}
void iwl_mvm_mac_mgd_protect_tdls_discover(struct ieee80211_hw *hw,
struct ieee80211_vif *vif)
{
struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
u32 duration = 2 * vif->bss_conf.dtim_period * vif->bss_conf.beacon_int;
/*
* iwl_mvm_protect_session() reads directly from the device
* (the system time), so make sure it is available.
*/
if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_PROTECT_TDLS))
return;
mutex_lock(&mvm->mutex);
/* Protect the session to hear the TDLS setup response on the channel */
iwl_mvm_protect_session(mvm, vif, duration, duration, 100, true);
mutex_unlock(&mvm->mutex);
iwl_mvm_unref(mvm, IWL_MVM_REF_PROTECT_TDLS);
}
static const char *
iwl_mvm_tdls_cs_state_str(enum iwl_mvm_tdls_cs_state state)
{
switch (state) {
case IWL_MVM_TDLS_SW_IDLE:
return "IDLE";
case IWL_MVM_TDLS_SW_REQ_SENT:
return "REQ SENT";
case IWL_MVM_TDLS_SW_RESP_RCVD:
return "RESP RECEIVED";
case IWL_MVM_TDLS_SW_REQ_RCVD:
return "REQ RECEIVED";
case IWL_MVM_TDLS_SW_ACTIVE:
return "ACTIVE";
}
return NULL;
}
static void iwl_mvm_tdls_update_cs_state(struct iwl_mvm *mvm,
enum iwl_mvm_tdls_cs_state state)
{
if (mvm->tdls_cs.state == state)
return;
IWL_DEBUG_TDLS(mvm, "TDLS channel switch state: %s -> %s\n",
iwl_mvm_tdls_cs_state_str(mvm->tdls_cs.state),
iwl_mvm_tdls_cs_state_str(state));
mvm->tdls_cs.state = state;
/* we only send requests to our switching peer - update sent time */
if (state == IWL_MVM_TDLS_SW_REQ_SENT)
mvm->tdls_cs.peer.sent_timestamp =
iwl_read_prph(mvm->trans, DEVICE_SYSTEM_TIME_REG);
if (state == IWL_MVM_TDLS_SW_IDLE)
mvm->tdls_cs.cur_sta_id = IWL_MVM_STATION_COUNT;
}
void iwl_mvm_rx_tdls_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_tdls_channel_switch_notif *notif = (void *)pkt->data;
struct ieee80211_sta *sta;
unsigned int delay;
struct iwl_mvm_sta *mvmsta;
struct ieee80211_vif *vif;
u32 sta_id = le32_to_cpu(notif->sta_id);
lockdep_assert_held(&mvm->mutex);
/* can fail sometimes */
if (!le32_to_cpu(notif->status)) {
iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE);
return;
}
if (WARN_ON(sta_id >= IWL_MVM_STATION_COUNT))
return;
sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
lockdep_is_held(&mvm->mutex));
/* the station may not be here, but if it is, it must be a TDLS peer */
if (IS_ERR_OR_NULL(sta) || WARN_ON(!sta->tdls))
return;
mvmsta = iwl_mvm_sta_from_mac80211(sta);
vif = mvmsta->vif;
/*
* Update state and possibly switch again after this is over (DTIM).
* Also convert TU to msec.
*/
delay = TU_TO_MS(vif->bss_conf.dtim_period * vif->bss_conf.beacon_int);
mod_delayed_work(system_wq, &mvm->tdls_cs.dwork,
msecs_to_jiffies(delay));
iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_ACTIVE);
}
static int
iwl_mvm_tdls_check_action(struct iwl_mvm *mvm,
enum iwl_tdls_channel_switch_type type,
const u8 *peer, bool peer_initiator, u32 timestamp)
{
bool same_peer = false;
int ret = 0;
/* get the existing peer if it's there */
if (mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE &&
mvm->tdls_cs.cur_sta_id != IWL_MVM_STATION_COUNT) {
struct ieee80211_sta *sta = rcu_dereference_protected(
mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id],
lockdep_is_held(&mvm->mutex));
if (!IS_ERR_OR_NULL(sta))
same_peer = ether_addr_equal(peer, sta->addr);
}
switch (mvm->tdls_cs.state) {
case IWL_MVM_TDLS_SW_IDLE:
/*
* might be spurious packet from the peer after the switch is
* already done
*/
if (type == TDLS_MOVE_CH)
ret = -EINVAL;
break;
case IWL_MVM_TDLS_SW_REQ_SENT:
/* only allow requests from the same peer */
if (!same_peer)
ret = -EBUSY;
else if (type == TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH &&
!peer_initiator)
/*
* We received a ch-switch request while an outgoing
* one is pending. Allow it if the peer is the link
* initiator.
*/
ret = -EBUSY;
else if (type == TDLS_SEND_CHAN_SW_REQ)
/* wait for idle before sending another request */
ret = -EBUSY;
else if (timestamp <= mvm->tdls_cs.peer.sent_timestamp)
/* we got a stale response - ignore it */
ret = -EINVAL;
break;
case IWL_MVM_TDLS_SW_RESP_RCVD:
/*
* we are waiting for the FW to give an "active" notification,
* so ignore requests in the meantime
*/
ret = -EBUSY;
break;
case IWL_MVM_TDLS_SW_REQ_RCVD:
/* as above, allow the link initiator to proceed */
if (type == TDLS_SEND_CHAN_SW_REQ) {
if (!same_peer)
ret = -EBUSY;
else if (peer_initiator) /* they are the initiator */
ret = -EBUSY;
} else if (type == TDLS_MOVE_CH) {
ret = -EINVAL;
}
break;
case IWL_MVM_TDLS_SW_ACTIVE:
/*
* the only valid request when active is a request to return
* to the base channel by the current off-channel peer
*/
if (type != TDLS_MOVE_CH || !same_peer)
ret = -EBUSY;
break;
}
if (ret)
IWL_DEBUG_TDLS(mvm,
"Invalid TDLS action %d state %d peer %pM same_peer %d initiator %d\n",
type, mvm->tdls_cs.state, peer, same_peer,
peer_initiator);
return ret;
}
static int
iwl_mvm_tdls_config_channel_switch(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
enum iwl_tdls_channel_switch_type type,
const u8 *peer, bool peer_initiator,
u8 oper_class,
struct cfg80211_chan_def *chandef,
u32 timestamp, u16 switch_time,
u16 switch_timeout, struct sk_buff *skb,
u32 ch_sw_tm_ie)
{
struct ieee80211_sta *sta;
struct iwl_mvm_sta *mvmsta;
struct ieee80211_tx_info *info;
struct ieee80211_hdr *hdr;
struct iwl_tdls_channel_switch_cmd cmd = {0};
int ret;
lockdep_assert_held(&mvm->mutex);
ret = iwl_mvm_tdls_check_action(mvm, type, peer, peer_initiator,
timestamp);
if (ret)
return ret;
if (!skb || WARN_ON(skb->len > IWL_TDLS_CH_SW_FRAME_MAX_SIZE)) {
ret = -EINVAL;
goto out;
}
cmd.switch_type = type;
cmd.timing.frame_timestamp = cpu_to_le32(timestamp);
cmd.timing.switch_time = cpu_to_le32(switch_time);
cmd.timing.switch_timeout = cpu_to_le32(switch_timeout);
rcu_read_lock();
sta = ieee80211_find_sta(vif, peer);
if (!sta) {
rcu_read_unlock();
ret = -ENOENT;
goto out;
}
mvmsta = iwl_mvm_sta_from_mac80211(sta);
cmd.peer_sta_id = cpu_to_le32(mvmsta->sta_id);
if (!chandef) {
if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT &&
mvm->tdls_cs.peer.chandef.chan) {
/* actually moving to the channel */
chandef = &mvm->tdls_cs.peer.chandef;
} else if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_ACTIVE &&
type == TDLS_MOVE_CH) {
/* we need to return to base channel */
struct ieee80211_chanctx_conf *chanctx =
rcu_dereference(vif->chanctx_conf);
if (WARN_ON_ONCE(!chanctx)) {
rcu_read_unlock();
goto out;
}
chandef = &chanctx->def;
}
}
if (chandef) {
cmd.ci.band = (chandef->chan->band == NL80211_BAND_2GHZ ?
PHY_BAND_24 : PHY_BAND_5);
cmd.ci.channel = chandef->chan->hw_value;
cmd.ci.width = iwl_mvm_get_channel_width(chandef);
cmd.ci.ctrl_pos = iwl_mvm_get_ctrl_pos(chandef);
}
/* keep quota calculation simple for now - 50% of DTIM for TDLS */
cmd.timing.max_offchan_duration =
cpu_to_le32(TU_TO_US(vif->bss_conf.dtim_period *
vif->bss_conf.beacon_int) / 2);
/* Switch time is the first element in the switch-timing IE. */
cmd.frame.switch_time_offset = cpu_to_le32(ch_sw_tm_ie + 2);
info = IEEE80211_SKB_CB(skb);
hdr = (void *)skb->data;
if (info->control.hw_key) {
if (info->control.hw_key->cipher != WLAN_CIPHER_SUITE_CCMP) {
rcu_read_unlock();
ret = -EINVAL;
goto out;
}
iwl_mvm_set_tx_cmd_ccmp(info, &cmd.frame.tx_cmd);
}
iwl_mvm_set_tx_cmd(mvm, skb, &cmd.frame.tx_cmd, info,
mvmsta->sta_id);
iwl_mvm_set_tx_cmd_rate(mvm, &cmd.frame.tx_cmd, info, sta,
hdr->frame_control);
rcu_read_unlock();
memcpy(cmd.frame.data, skb->data, skb->len);
ret = iwl_mvm_send_cmd_pdu(mvm, TDLS_CHANNEL_SWITCH_CMD, 0,
sizeof(cmd), &cmd);
if (ret) {
IWL_ERR(mvm, "Failed to send TDLS_CHANNEL_SWITCH cmd: %d\n",
ret);
goto out;
}
/* channel switch has started, update state */
if (type != TDLS_MOVE_CH) {
mvm->tdls_cs.cur_sta_id = mvmsta->sta_id;
iwl_mvm_tdls_update_cs_state(mvm,
type == TDLS_SEND_CHAN_SW_REQ ?
IWL_MVM_TDLS_SW_REQ_SENT :
IWL_MVM_TDLS_SW_REQ_RCVD);
} else {
iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_RESP_RCVD);
}
out:
/* channel switch failed - we are idle */
if (ret)
iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE);
return ret;
}
void iwl_mvm_tdls_ch_switch_work(struct work_struct *work)
{
struct iwl_mvm *mvm;
struct ieee80211_sta *sta;
struct iwl_mvm_sta *mvmsta;
struct ieee80211_vif *vif;
unsigned int delay;
int ret;
mvm = container_of(work, struct iwl_mvm, tdls_cs.dwork.work);
mutex_lock(&mvm->mutex);
/* called after an active channel switch has finished or timed-out */
iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE);
/* station might be gone, in that case do nothing */
if (mvm->tdls_cs.peer.sta_id == IWL_MVM_STATION_COUNT)
goto out;
sta = rcu_dereference_protected(
mvm->fw_id_to_mac_id[mvm->tdls_cs.peer.sta_id],
lockdep_is_held(&mvm->mutex));
/* the station may not be here, but if it is, it must be a TDLS peer */
if (!sta || IS_ERR(sta) || WARN_ON(!sta->tdls))
goto out;
mvmsta = iwl_mvm_sta_from_mac80211(sta);
vif = mvmsta->vif;
ret = iwl_mvm_tdls_config_channel_switch(mvm, vif,
TDLS_SEND_CHAN_SW_REQ,
sta->addr,
mvm->tdls_cs.peer.initiator,
mvm->tdls_cs.peer.op_class,
&mvm->tdls_cs.peer.chandef,
0, 0, 0,
mvm->tdls_cs.peer.skb,
mvm->tdls_cs.peer.ch_sw_tm_ie);
if (ret)
IWL_ERR(mvm, "Not sending TDLS channel switch: %d\n", ret);
/* retry after a DTIM if we failed sending now */
delay = TU_TO_MS(vif->bss_conf.dtim_period * vif->bss_conf.beacon_int);
queue_delayed_work(system_wq, &mvm->tdls_cs.dwork,
msecs_to_jiffies(delay));
out:
mutex_unlock(&mvm->mutex);
}
int
iwl_mvm_tdls_channel_switch(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct ieee80211_sta *sta, u8 oper_class,
struct cfg80211_chan_def *chandef,
struct sk_buff *tmpl_skb, u32 ch_sw_tm_ie)
{
struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
struct iwl_mvm_sta *mvmsta;
unsigned int delay;
int ret;
mutex_lock(&mvm->mutex);
IWL_DEBUG_TDLS(mvm, "TDLS channel switch with %pM ch %d width %d\n",
sta->addr, chandef->chan->center_freq, chandef->width);
/* we only support a single peer for channel switching */
if (mvm->tdls_cs.peer.sta_id != IWL_MVM_STATION_COUNT) {
IWL_DEBUG_TDLS(mvm,
"Existing peer. Can't start switch with %pM\n",
sta->addr);
ret = -EBUSY;
goto out;
}
ret = iwl_mvm_tdls_config_channel_switch(mvm, vif,
TDLS_SEND_CHAN_SW_REQ,
sta->addr, sta->tdls_initiator,
oper_class, chandef, 0, 0, 0,
tmpl_skb, ch_sw_tm_ie);
if (ret)
goto out;
/*
* Mark the peer as "in tdls switch" for this vif. We only allow a
* single such peer per vif.
*/
mvm->tdls_cs.peer.skb = skb_copy(tmpl_skb, GFP_KERNEL);
if (!mvm->tdls_cs.peer.skb) {
ret = -ENOMEM;
goto out;
}
mvmsta = iwl_mvm_sta_from_mac80211(sta);
mvm->tdls_cs.peer.sta_id = mvmsta->sta_id;
mvm->tdls_cs.peer.chandef = *chandef;
mvm->tdls_cs.peer.initiator = sta->tdls_initiator;
mvm->tdls_cs.peer.op_class = oper_class;
mvm->tdls_cs.peer.ch_sw_tm_ie = ch_sw_tm_ie;
/*
* Wait for 2 DTIM periods before attempting the next switch. The next
* switch will be made sooner if the current one completes before that.
*/
delay = 2 * TU_TO_MS(vif->bss_conf.dtim_period *
vif->bss_conf.beacon_int);
mod_delayed_work(system_wq, &mvm->tdls_cs.dwork,
msecs_to_jiffies(delay));
out:
mutex_unlock(&mvm->mutex);
return ret;
}
void iwl_mvm_tdls_cancel_channel_switch(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct ieee80211_sta *sta)
{
struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
struct ieee80211_sta *cur_sta;
bool wait_for_phy = false;
mutex_lock(&mvm->mutex);
IWL_DEBUG_TDLS(mvm, "TDLS cancel channel switch with %pM\n", sta->addr);
/* we only support a single peer for channel switching */
if (mvm->tdls_cs.peer.sta_id == IWL_MVM_STATION_COUNT) {
IWL_DEBUG_TDLS(mvm, "No ch switch peer - %pM\n", sta->addr);
goto out;
}
cur_sta = rcu_dereference_protected(
mvm->fw_id_to_mac_id[mvm->tdls_cs.peer.sta_id],
lockdep_is_held(&mvm->mutex));
/* make sure it's the same peer */
if (cur_sta != sta)
goto out;
/*
* If we're currently in a switch because of the now canceled peer,
* wait a DTIM here to make sure the phy is back on the base channel.
* We can't otherwise force it.
*/
if (mvm->tdls_cs.cur_sta_id == mvm->tdls_cs.peer.sta_id &&
mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE)
wait_for_phy = true;
mvm->tdls_cs.peer.sta_id = IWL_MVM_STATION_COUNT;
dev_kfree_skb(mvm->tdls_cs.peer.skb);
mvm->tdls_cs.peer.skb = NULL;
out:
mutex_unlock(&mvm->mutex);
/* make sure the phy is on the base channel */
if (wait_for_phy)
msleep(TU_TO_MS(vif->bss_conf.dtim_period *
vif->bss_conf.beacon_int));
/* flush the channel switch state */
flush_delayed_work(&mvm->tdls_cs.dwork);
IWL_DEBUG_TDLS(mvm, "TDLS ending channel switch with %pM\n", sta->addr);
}
void
iwl_mvm_tdls_recv_channel_switch(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct ieee80211_tdls_ch_sw_params *params)
{
struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
enum iwl_tdls_channel_switch_type type;
unsigned int delay;
const char *action_str =
params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ?
"REQ" : "RESP";
mutex_lock(&mvm->mutex);
IWL_DEBUG_TDLS(mvm,
"Received TDLS ch switch action %s from %pM status %d\n",
action_str, params->sta->addr, params->status);
/*
* we got a non-zero status from a peer we were switching to - move to
* the idle state and retry again later
*/
if (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE &&
params->status != 0 &&
mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT &&
mvm->tdls_cs.cur_sta_id != IWL_MVM_STATION_COUNT) {
struct ieee80211_sta *cur_sta;
/* make sure it's the same peer */
cur_sta = rcu_dereference_protected(
mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id],
lockdep_is_held(&mvm->mutex));
if (cur_sta == params->sta) {
iwl_mvm_tdls_update_cs_state(mvm,
IWL_MVM_TDLS_SW_IDLE);
goto retry;
}
}
type = (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST) ?
TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH : TDLS_MOVE_CH;
iwl_mvm_tdls_config_channel_switch(mvm, vif, type, params->sta->addr,
params->sta->tdls_initiator, 0,
params->chandef, params->timestamp,
params->switch_time,
params->switch_timeout,
params->tmpl_skb,
params->ch_sw_tm_ie);
retry:
/* register a timeout in case we don't succeed in switching */
delay = vif->bss_conf.dtim_period * vif->bss_conf.beacon_int *
1024 / 1000;
mod_delayed_work(system_wq, &mvm->tdls_cs.dwork,
msecs_to_jiffies(delay));
mutex_unlock(&mvm->mutex);
}
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