1 /* 2 * NXP Wireless LAN device driver: 802.11h 3 * 4 * Copyright 2011-2020 NXP 5 * 6 * This software file (the "File") is distributed by NXP 7 * under the terms of the GNU General Public License Version 2, June 1991 8 * (the "License"). You may use, redistribute and/or modify this File in 9 * accordance with the terms and conditions of the License, a copy of which 10 * is available by writing to the Free Software Foundation, Inc., 11 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the 12 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt. 13 * 14 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE 16 * ARE EXPRESSLY DISCLAIMED. The License provides additional details about 17 * this warranty disclaimer. 18 */ 19 20 #include "main.h" 21 #include "fw.h" 22 23 24 void mwifiex_init_11h_params(struct mwifiex_private *priv) 25 { 26 priv->state_11h.is_11h_enabled = true; 27 priv->state_11h.is_11h_active = false; 28 } 29 30 inline int mwifiex_is_11h_active(struct mwifiex_private *priv) 31 { 32 return priv->state_11h.is_11h_active; 33 } 34 /* This function appends 11h info to a buffer while joining an 35 * infrastructure BSS 36 */ 37 static void 38 mwifiex_11h_process_infra_join(struct mwifiex_private *priv, u8 **buffer, 39 struct mwifiex_bssdescriptor *bss_desc) 40 { 41 struct mwifiex_ie_types_header *ie_header; 42 struct mwifiex_ie_types_pwr_capability *cap; 43 struct mwifiex_ie_types_local_pwr_constraint *constraint; 44 struct ieee80211_supported_band *sband; 45 u8 radio_type; 46 int i; 47 48 if (!buffer || !(*buffer)) 49 return; 50 51 radio_type = mwifiex_band_to_radio_type((u8) bss_desc->bss_band); 52 sband = priv->wdev.wiphy->bands[radio_type]; 53 54 cap = (struct mwifiex_ie_types_pwr_capability *)*buffer; 55 cap->header.type = cpu_to_le16(WLAN_EID_PWR_CAPABILITY); 56 cap->header.len = cpu_to_le16(2); 57 cap->min_pwr = 0; 58 cap->max_pwr = 0; 59 *buffer += sizeof(*cap); 60 61 constraint = (struct mwifiex_ie_types_local_pwr_constraint *)*buffer; 62 constraint->header.type = cpu_to_le16(WLAN_EID_PWR_CONSTRAINT); 63 constraint->header.len = cpu_to_le16(2); 64 constraint->chan = bss_desc->channel; 65 constraint->constraint = bss_desc->local_constraint; 66 *buffer += sizeof(*constraint); 67 68 ie_header = (struct mwifiex_ie_types_header *)*buffer; 69 ie_header->type = cpu_to_le16(TLV_TYPE_PASSTHROUGH); 70 ie_header->len = cpu_to_le16(2 * sband->n_channels + 2); 71 *buffer += sizeof(*ie_header); 72 *(*buffer)++ = WLAN_EID_SUPPORTED_CHANNELS; 73 *(*buffer)++ = 2 * sband->n_channels; 74 for (i = 0; i < sband->n_channels; i++) { 75 *(*buffer)++ = ieee80211_frequency_to_channel( 76 sband->channels[i].center_freq); 77 *(*buffer)++ = 1; /* one channel in the subband */ 78 } 79 } 80 81 /* Enable or disable the 11h extensions in the firmware */ 82 int mwifiex_11h_activate(struct mwifiex_private *priv, bool flag) 83 { 84 u32 enable = flag; 85 86 /* enable master mode radar detection on AP interface */ 87 if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) && enable) 88 enable |= MWIFIEX_MASTER_RADAR_DET_MASK; 89 90 return mwifiex_send_cmd(priv, HostCmd_CMD_802_11_SNMP_MIB, 91 HostCmd_ACT_GEN_SET, DOT11H_I, &enable, true); 92 } 93 94 /* This functions processes TLV buffer for a pending BSS Join command. 95 * 96 * Activate 11h functionality in the firmware if the spectrum management 97 * capability bit is found in the network we are joining. Also, necessary 98 * TLVs are set based on requested network's 11h capability. 99 */ 100 void mwifiex_11h_process_join(struct mwifiex_private *priv, u8 **buffer, 101 struct mwifiex_bssdescriptor *bss_desc) 102 { 103 if (bss_desc->sensed_11h) { 104 /* Activate 11h functions in firmware, turns on capability 105 * bit 106 */ 107 mwifiex_11h_activate(priv, true); 108 priv->state_11h.is_11h_active = true; 109 bss_desc->cap_info_bitmap |= WLAN_CAPABILITY_SPECTRUM_MGMT; 110 mwifiex_11h_process_infra_join(priv, buffer, bss_desc); 111 } else { 112 /* Deactivate 11h functions in the firmware */ 113 mwifiex_11h_activate(priv, false); 114 priv->state_11h.is_11h_active = false; 115 bss_desc->cap_info_bitmap &= ~WLAN_CAPABILITY_SPECTRUM_MGMT; 116 } 117 } 118 119 /* This is DFS CAC work queue function. 120 * This delayed work emits CAC finished event for cfg80211 if 121 * CAC was started earlier. 122 */ 123 void mwifiex_dfs_cac_work_queue(struct work_struct *work) 124 { 125 struct cfg80211_chan_def chandef; 126 struct delayed_work *delayed_work = to_delayed_work(work); 127 struct mwifiex_private *priv = 128 container_of(delayed_work, struct mwifiex_private, 129 dfs_cac_work); 130 131 chandef = priv->dfs_chandef; 132 if (priv->wdev.cac_started) { 133 mwifiex_dbg(priv->adapter, MSG, 134 "CAC timer finished; No radar detected\n"); 135 cfg80211_cac_event(priv->netdev, &chandef, 136 NL80211_RADAR_CAC_FINISHED, 137 GFP_KERNEL); 138 } 139 } 140 141 /* This function prepares channel report request command to FW for 142 * starting radar detection. 143 */ 144 int mwifiex_cmd_issue_chan_report_request(struct mwifiex_private *priv, 145 struct host_cmd_ds_command *cmd, 146 void *data_buf) 147 { 148 struct host_cmd_ds_chan_rpt_req *cr_req = &cmd->params.chan_rpt_req; 149 struct mwifiex_radar_params *radar_params = (void *)data_buf; 150 151 cmd->command = cpu_to_le16(HostCmd_CMD_CHAN_REPORT_REQUEST); 152 cmd->size = cpu_to_le16(S_DS_GEN); 153 le16_unaligned_add_cpu(&cmd->size, 154 sizeof(struct host_cmd_ds_chan_rpt_req)); 155 156 cr_req->chan_desc.start_freq = cpu_to_le16(MWIFIEX_A_BAND_START_FREQ); 157 cr_req->chan_desc.chan_num = radar_params->chandef->chan->hw_value; 158 cr_req->chan_desc.chan_width = radar_params->chandef->width; 159 cr_req->msec_dwell_time = cpu_to_le32(radar_params->cac_time_ms); 160 161 if (radar_params->cac_time_ms) 162 mwifiex_dbg(priv->adapter, MSG, 163 "11h: issuing DFS Radar check for channel=%d\n", 164 radar_params->chandef->chan->hw_value); 165 else 166 mwifiex_dbg(priv->adapter, MSG, "cancelling CAC\n"); 167 168 return 0; 169 } 170 171 int mwifiex_stop_radar_detection(struct mwifiex_private *priv, 172 struct cfg80211_chan_def *chandef) 173 { 174 struct mwifiex_radar_params radar_params; 175 176 memset(&radar_params, 0, sizeof(struct mwifiex_radar_params)); 177 radar_params.chandef = chandef; 178 radar_params.cac_time_ms = 0; 179 180 return mwifiex_send_cmd(priv, HostCmd_CMD_CHAN_REPORT_REQUEST, 181 HostCmd_ACT_GEN_SET, 0, &radar_params, true); 182 } 183 184 /* This function is to abort ongoing CAC upon stopping AP operations 185 * or during unload. 186 */ 187 void mwifiex_abort_cac(struct mwifiex_private *priv) 188 { 189 if (priv->wdev.cac_started) { 190 if (mwifiex_stop_radar_detection(priv, &priv->dfs_chandef)) 191 mwifiex_dbg(priv->adapter, ERROR, 192 "failed to stop CAC in FW\n"); 193 mwifiex_dbg(priv->adapter, MSG, 194 "Aborting delayed work for CAC.\n"); 195 cancel_delayed_work_sync(&priv->dfs_cac_work); 196 cfg80211_cac_event(priv->netdev, &priv->dfs_chandef, 197 NL80211_RADAR_CAC_ABORTED, GFP_KERNEL); 198 } 199 } 200 201 /* This function handles channel report event from FW during CAC period. 202 * If radar is detected during CAC, driver indicates the same to cfg80211 203 * and also cancels ongoing delayed work. 204 */ 205 int mwifiex_11h_handle_chanrpt_ready(struct mwifiex_private *priv, 206 struct sk_buff *skb) 207 { 208 struct host_cmd_ds_chan_rpt_event *rpt_event; 209 struct mwifiex_ie_types_chan_rpt_data *rpt; 210 u8 *evt_buf; 211 u16 event_len, tlv_len; 212 213 rpt_event = (void *)(skb->data + sizeof(u32)); 214 event_len = skb->len - (sizeof(struct host_cmd_ds_chan_rpt_event)+ 215 sizeof(u32)); 216 217 if (le32_to_cpu(rpt_event->result) != HostCmd_RESULT_OK) { 218 mwifiex_dbg(priv->adapter, ERROR, 219 "Error in channel report event\n"); 220 return -1; 221 } 222 223 evt_buf = (void *)&rpt_event->tlvbuf; 224 225 while (event_len >= sizeof(struct mwifiex_ie_types_header)) { 226 rpt = (void *)&rpt_event->tlvbuf; 227 tlv_len = le16_to_cpu(rpt->header.len); 228 229 switch (le16_to_cpu(rpt->header.type)) { 230 case TLV_TYPE_CHANRPT_11H_BASIC: 231 if (rpt->map.radar) { 232 mwifiex_dbg(priv->adapter, MSG, 233 "RADAR Detected on channel %d!\n", 234 priv->dfs_chandef.chan->hw_value); 235 cancel_delayed_work_sync(&priv->dfs_cac_work); 236 cfg80211_cac_event(priv->netdev, 237 &priv->dfs_chandef, 238 NL80211_RADAR_DETECTED, 239 GFP_KERNEL); 240 } 241 break; 242 default: 243 break; 244 } 245 246 evt_buf += (tlv_len + sizeof(rpt->header)); 247 event_len -= (tlv_len + sizeof(rpt->header)); 248 } 249 250 return 0; 251 } 252 253 /* Handler for radar detected event from FW.*/ 254 int mwifiex_11h_handle_radar_detected(struct mwifiex_private *priv, 255 struct sk_buff *skb) 256 { 257 struct mwifiex_radar_det_event *rdr_event; 258 259 rdr_event = (void *)(skb->data + sizeof(u32)); 260 261 mwifiex_dbg(priv->adapter, MSG, 262 "radar detected; indicating kernel\n"); 263 if (mwifiex_stop_radar_detection(priv, &priv->dfs_chandef)) 264 mwifiex_dbg(priv->adapter, ERROR, 265 "Failed to stop CAC in FW\n"); 266 cfg80211_radar_event(priv->adapter->wiphy, &priv->dfs_chandef, 267 GFP_KERNEL); 268 mwifiex_dbg(priv->adapter, MSG, "regdomain: %d\n", 269 rdr_event->reg_domain); 270 mwifiex_dbg(priv->adapter, MSG, "radar detection type: %d\n", 271 rdr_event->det_type); 272 273 return 0; 274 } 275 276 /* This is work queue function for channel switch handling. 277 * This function takes care of updating new channel definitin to 278 * bss config structure, restart AP and indicate channel switch success 279 * to cfg80211. 280 */ 281 void mwifiex_dfs_chan_sw_work_queue(struct work_struct *work) 282 { 283 struct mwifiex_uap_bss_param *bss_cfg; 284 struct delayed_work *delayed_work = to_delayed_work(work); 285 struct mwifiex_private *priv = 286 container_of(delayed_work, struct mwifiex_private, 287 dfs_chan_sw_work); 288 289 bss_cfg = &priv->bss_cfg; 290 if (!bss_cfg->beacon_period) { 291 mwifiex_dbg(priv->adapter, ERROR, 292 "channel switch: AP already stopped\n"); 293 return; 294 } 295 296 mwifiex_uap_set_channel(priv, bss_cfg, priv->dfs_chandef); 297 298 if (mwifiex_config_start_uap(priv, bss_cfg)) { 299 mwifiex_dbg(priv->adapter, ERROR, 300 "Failed to start AP after channel switch\n"); 301 return; 302 } 303 304 mwifiex_dbg(priv->adapter, MSG, 305 "indicating channel switch completion to kernel\n"); 306 cfg80211_ch_switch_notify(priv->netdev, &priv->dfs_chandef); 307 } 308