drivers/net/wireless/iwlwifi/mvm/tdls.c

   1 /******************************************************************************
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   4  * redistributing this file, you may do so under either license.
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   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2014 Intel Mobile Communications GmbH
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
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  32  *
  33  * Copyright(c) 2014 Intel Mobile Communications GmbH
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  48  *    from this software without specific prior written permission.
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  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *
  62  *****************************************************************************/
  63
  64 #include "mvm.h"
  65 #include "time-event.h"
  66
  67 void iwl_mvm_teardown_tdls_peers(struct iwl_mvm *mvm)
  68 {
  69         struct ieee80211_sta *sta;
  70         struct iwl_mvm_sta *mvmsta;
  71         int i;
  72
  73         lockdep_assert_held(&mvm->mutex);
  74
  75         for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
  76                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
  77                                                 lockdep_is_held(&mvm->mutex));
  78                 if (!sta || IS_ERR(sta) || !sta->tdls)
  79                         continue;
  80
  81                 mvmsta = iwl_mvm_sta_from_mac80211(sta);
  82                 ieee80211_tdls_oper_request(mvmsta->vif, sta->addr,
  83                                 NL80211_TDLS_TEARDOWN,
  84                                 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED,
  85                                 GFP_KERNEL);
  86         }
  87 }
  88
  89 int iwl_mvm_tdls_sta_count(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
  90 {
  91         struct ieee80211_sta *sta;
  92         struct iwl_mvm_sta *mvmsta;
  93         int count = 0;
  94         int i;
  95
  96         lockdep_assert_held(&mvm->mutex);
  97
  98         for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
  99                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 100                                                 lockdep_is_held(&mvm->mutex));
 101                 if (!sta || IS_ERR(sta) || !sta->tdls)
 102                         continue;
 103
 104                 if (vif) {
 105                         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 106                         if (mvmsta->vif != vif)
 107                                 continue;
 108                 }
 109
 110                 count++;
 111         }
 112
 113         return count;
 114 }
 115
 116 static void iwl_mvm_tdls_config(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 117 {
 118         struct iwl_rx_packet *pkt;
 119         struct iwl_tdls_config_res *resp;
 120         struct iwl_tdls_config_cmd tdls_cfg_cmd = {};
 121         struct iwl_host_cmd cmd = {
 122                 .id = TDLS_CONFIG_CMD,
 123                 .flags = CMD_WANT_SKB,
 124                 .data = { &tdls_cfg_cmd, },
 125                 .len = { sizeof(struct iwl_tdls_config_cmd), },
 126         };
 127         struct ieee80211_sta *sta;
 128         int ret, i, cnt;
 129         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 130
 131         lockdep_assert_held(&mvm->mutex);
 132
 133         tdls_cfg_cmd.id_and_color =
 134                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 135         tdls_cfg_cmd.tx_to_ap_tid = IWL_MVM_TDLS_FW_TID;
 136         tdls_cfg_cmd.tx_to_ap_ssn = cpu_to_le16(0); /* not used for now */
 137
 138         /* for now the Tx cmd is empty and unused */
 139
 140         /* populate TDLS peer data */
 141         cnt = 0;
 142         for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
 143                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 144                                                 lockdep_is_held(&mvm->mutex));
 145                 if (IS_ERR_OR_NULL(sta) || !sta->tdls)
 146                         continue;
 147
 148                 tdls_cfg_cmd.sta_info[cnt].sta_id = i;
 149                 tdls_cfg_cmd.sta_info[cnt].tx_to_peer_tid =
 150                                                         IWL_MVM_TDLS_FW_TID;
 151                 tdls_cfg_cmd.sta_info[cnt].tx_to_peer_ssn = cpu_to_le16(0);
 152                 tdls_cfg_cmd.sta_info[cnt].is_initiator =
 153                                 cpu_to_le32(sta->tdls_initiator ? 1 : 0);
 154
 155                 cnt++;
 156         }
 157
 158         tdls_cfg_cmd.tdls_peer_count = cnt;
 159         IWL_DEBUG_TDLS(mvm, "send TDLS config to FW for %d peers\n", cnt);
 160
 161         ret = iwl_mvm_send_cmd(mvm, &cmd);
 162         if (WARN_ON_ONCE(ret))
 163                 return;
 164
 165         pkt = cmd.resp_pkt;
 166         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 167                 IWL_ERR(mvm, "Bad return from TDLS_CONFIG_COMMAND (0x%08X)\n",
 168                         pkt->hdr.flags);
 169                 goto exit;
 170         }
 171
 172         if (WARN_ON_ONCE(iwl_rx_packet_payload_len(pkt) != sizeof(*resp)))
 173                 goto exit;
 174
 175         /* we don't really care about the response at this point */
 176
 177 exit:
 178         iwl_free_resp(&cmd);
 179 }
 180
 181 void iwl_mvm_recalc_tdls_state(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 182                                bool sta_added)
 183 {
 184         int tdls_sta_cnt = iwl_mvm_tdls_sta_count(mvm, vif);
 185
 186         /* when the first peer joins, send a power update first */
 187         if (tdls_sta_cnt == 1 && sta_added)
 188                 iwl_mvm_power_update_mac(mvm);
 189
 190         /* configure the FW with TDLS peer info */
 191         iwl_mvm_tdls_config(mvm, vif);
 192
 193         /* when the last peer leaves, send a power update last */
 194         if (tdls_sta_cnt == 0 && !sta_added)
 195                 iwl_mvm_power_update_mac(mvm);
 196 }
 197
 198 void iwl_mvm_mac_mgd_protect_tdls_discover(struct ieee80211_hw *hw,
 199                                            struct ieee80211_vif *vif)
 200 {
 201         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 202         u32 duration = 2 * vif->bss_conf.dtim_period * vif->bss_conf.beacon_int;
 203
 204         /*
 205          * iwl_mvm_protect_session() reads directly from the device
 206          * (the system time), so make sure it is available.
 207          */
 208         if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_PROTECT_TDLS))
 209                 return;
 210
 211         mutex_lock(&mvm->mutex);
 212         /* Protect the session to hear the TDLS setup response on the channel */
 213         iwl_mvm_protect_session(mvm, vif, duration, duration, 100, true);
 214         mutex_unlock(&mvm->mutex);
 215
 216         iwl_mvm_unref(mvm, IWL_MVM_REF_PROTECT_TDLS);
 217 }