1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * NXP Wireless LAN device driver: 802.11h 4 * 5 * Copyright 2011-2020 NXP 6 */ 7 8 #include "main.h" 9 #include "fw.h" 10 11 12 void mwifiex_init_11h_params(struct mwifiex_private *priv) 13 { 14 priv->state_11h.is_11h_enabled = true; 15 priv->state_11h.is_11h_active = false; 16 } 17 18 inline int mwifiex_is_11h_active(struct mwifiex_private *priv) 19 { 20 return priv->state_11h.is_11h_active; 21 } 22 /* This function appends 11h info to a buffer while joining an 23 * infrastructure BSS 24 */ 25 static void 26 mwifiex_11h_process_infra_join(struct mwifiex_private *priv, u8 **buffer, 27 struct mwifiex_bssdescriptor *bss_desc) 28 { 29 struct mwifiex_ie_types_header *ie_header; 30 struct mwifiex_ie_types_pwr_capability *cap; 31 struct mwifiex_ie_types_local_pwr_constraint *constraint; 32 struct ieee80211_supported_band *sband; 33 u8 radio_type; 34 int i; 35 36 if (!buffer || !(*buffer)) 37 return; 38 39 radio_type = mwifiex_band_to_radio_type((u8) bss_desc->bss_band); 40 sband = priv->wdev.wiphy->bands[radio_type]; 41 42 cap = (struct mwifiex_ie_types_pwr_capability *)*buffer; 43 cap->header.type = cpu_to_le16(WLAN_EID_PWR_CAPABILITY); 44 cap->header.len = cpu_to_le16(2); 45 cap->min_pwr = 0; 46 cap->max_pwr = 0; 47 *buffer += sizeof(*cap); 48 49 constraint = (struct mwifiex_ie_types_local_pwr_constraint *)*buffer; 50 constraint->header.type = cpu_to_le16(WLAN_EID_PWR_CONSTRAINT); 51 constraint->header.len = cpu_to_le16(2); 52 constraint->chan = bss_desc->channel; 53 constraint->constraint = bss_desc->local_constraint; 54 *buffer += sizeof(*constraint); 55 56 ie_header = (struct mwifiex_ie_types_header *)*buffer; 57 ie_header->type = cpu_to_le16(TLV_TYPE_PASSTHROUGH); 58 ie_header->len = cpu_to_le16(2 * sband->n_channels + 2); 59 *buffer += sizeof(*ie_header); 60 *(*buffer)++ = WLAN_EID_SUPPORTED_CHANNELS; 61 *(*buffer)++ = 2 * sband->n_channels; 62 for (i = 0; i < sband->n_channels; i++) { 63 *(*buffer)++ = ieee80211_frequency_to_channel( 64 sband->channels[i].center_freq); 65 *(*buffer)++ = 1; /* one channel in the subband */ 66 } 67 } 68 69 /* Enable or disable the 11h extensions in the firmware */ 70 int mwifiex_11h_activate(struct mwifiex_private *priv, bool flag) 71 { 72 u32 enable = flag; 73 74 /* enable master mode radar detection on AP interface */ 75 if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) && enable) 76 enable |= MWIFIEX_MASTER_RADAR_DET_MASK; 77 78 return mwifiex_send_cmd(priv, HostCmd_CMD_802_11_SNMP_MIB, 79 HostCmd_ACT_GEN_SET, DOT11H_I, &enable, true); 80 } 81 82 /* This functions processes TLV buffer for a pending BSS Join command. 83 * 84 * Activate 11h functionality in the firmware if the spectrum management 85 * capability bit is found in the network we are joining. Also, necessary 86 * TLVs are set based on requested network's 11h capability. 87 */ 88 void mwifiex_11h_process_join(struct mwifiex_private *priv, u8 **buffer, 89 struct mwifiex_bssdescriptor *bss_desc) 90 { 91 if (bss_desc->sensed_11h) { 92 /* Activate 11h functions in firmware, turns on capability 93 * bit 94 */ 95 mwifiex_11h_activate(priv, true); 96 priv->state_11h.is_11h_active = true; 97 bss_desc->cap_info_bitmap |= WLAN_CAPABILITY_SPECTRUM_MGMT; 98 mwifiex_11h_process_infra_join(priv, buffer, bss_desc); 99 } else { 100 /* Deactivate 11h functions in the firmware */ 101 mwifiex_11h_activate(priv, false); 102 priv->state_11h.is_11h_active = false; 103 bss_desc->cap_info_bitmap &= ~WLAN_CAPABILITY_SPECTRUM_MGMT; 104 } 105 } 106 107 /* This is DFS CAC work queue function. 108 * This delayed work emits CAC finished event for cfg80211 if 109 * CAC was started earlier. 110 */ 111 void mwifiex_dfs_cac_work_queue(struct work_struct *work) 112 { 113 struct cfg80211_chan_def chandef; 114 struct delayed_work *delayed_work = to_delayed_work(work); 115 struct mwifiex_private *priv = 116 container_of(delayed_work, struct mwifiex_private, 117 dfs_cac_work); 118 119 chandef = priv->dfs_chandef; 120 if (priv->wdev.cac_started) { 121 mwifiex_dbg(priv->adapter, MSG, 122 "CAC timer finished; No radar detected\n"); 123 cfg80211_cac_event(priv->netdev, &chandef, 124 NL80211_RADAR_CAC_FINISHED, 125 GFP_KERNEL); 126 } 127 } 128 129 /* This function prepares channel report request command to FW for 130 * starting radar detection. 131 */ 132 int mwifiex_cmd_issue_chan_report_request(struct mwifiex_private *priv, 133 struct host_cmd_ds_command *cmd, 134 void *data_buf) 135 { 136 struct host_cmd_ds_chan_rpt_req *cr_req = &cmd->params.chan_rpt_req; 137 struct mwifiex_radar_params *radar_params = (void *)data_buf; 138 139 cmd->command = cpu_to_le16(HostCmd_CMD_CHAN_REPORT_REQUEST); 140 cmd->size = cpu_to_le16(S_DS_GEN); 141 le16_unaligned_add_cpu(&cmd->size, 142 sizeof(struct host_cmd_ds_chan_rpt_req)); 143 144 cr_req->chan_desc.start_freq = cpu_to_le16(MWIFIEX_A_BAND_START_FREQ); 145 cr_req->chan_desc.chan_num = radar_params->chandef->chan->hw_value; 146 cr_req->chan_desc.chan_width = radar_params->chandef->width; 147 cr_req->msec_dwell_time = cpu_to_le32(radar_params->cac_time_ms); 148 149 if (radar_params->cac_time_ms) 150 mwifiex_dbg(priv->adapter, MSG, 151 "11h: issuing DFS Radar check for channel=%d\n", 152 radar_params->chandef->chan->hw_value); 153 else 154 mwifiex_dbg(priv->adapter, MSG, "cancelling CAC\n"); 155 156 return 0; 157 } 158 159 int mwifiex_stop_radar_detection(struct mwifiex_private *priv, 160 struct cfg80211_chan_def *chandef) 161 { 162 struct mwifiex_radar_params radar_params; 163 164 memset(&radar_params, 0, sizeof(struct mwifiex_radar_params)); 165 radar_params.chandef = chandef; 166 radar_params.cac_time_ms = 0; 167 168 return mwifiex_send_cmd(priv, HostCmd_CMD_CHAN_REPORT_REQUEST, 169 HostCmd_ACT_GEN_SET, 0, &radar_params, true); 170 } 171 172 /* This function is to abort ongoing CAC upon stopping AP operations 173 * or during unload. 174 */ 175 void mwifiex_abort_cac(struct mwifiex_private *priv) 176 { 177 if (priv->wdev.cac_started) { 178 if (mwifiex_stop_radar_detection(priv, &priv->dfs_chandef)) 179 mwifiex_dbg(priv->adapter, ERROR, 180 "failed to stop CAC in FW\n"); 181 mwifiex_dbg(priv->adapter, MSG, 182 "Aborting delayed work for CAC.\n"); 183 cancel_delayed_work_sync(&priv->dfs_cac_work); 184 cfg80211_cac_event(priv->netdev, &priv->dfs_chandef, 185 NL80211_RADAR_CAC_ABORTED, GFP_KERNEL); 186 } 187 } 188 189 /* This function handles channel report event from FW during CAC period. 190 * If radar is detected during CAC, driver indicates the same to cfg80211 191 * and also cancels ongoing delayed work. 192 */ 193 int mwifiex_11h_handle_chanrpt_ready(struct mwifiex_private *priv, 194 struct sk_buff *skb) 195 { 196 struct host_cmd_ds_chan_rpt_event *rpt_event; 197 struct mwifiex_ie_types_chan_rpt_data *rpt; 198 u8 *evt_buf; 199 u16 event_len, tlv_len; 200 201 rpt_event = (void *)(skb->data + sizeof(u32)); 202 event_len = skb->len - (sizeof(struct host_cmd_ds_chan_rpt_event)+ 203 sizeof(u32)); 204 205 if (le32_to_cpu(rpt_event->result) != HostCmd_RESULT_OK) { 206 mwifiex_dbg(priv->adapter, ERROR, 207 "Error in channel report event\n"); 208 return -1; 209 } 210 211 evt_buf = (void *)&rpt_event->tlvbuf; 212 213 while (event_len >= sizeof(struct mwifiex_ie_types_header)) { 214 rpt = (void *)&rpt_event->tlvbuf; 215 tlv_len = le16_to_cpu(rpt->header.len); 216 217 switch (le16_to_cpu(rpt->header.type)) { 218 case TLV_TYPE_CHANRPT_11H_BASIC: 219 if (rpt->map.radar) { 220 mwifiex_dbg(priv->adapter, MSG, 221 "RADAR Detected on channel %d!\n", 222 priv->dfs_chandef.chan->hw_value); 223 cancel_delayed_work_sync(&priv->dfs_cac_work); 224 cfg80211_cac_event(priv->netdev, 225 &priv->dfs_chandef, 226 NL80211_RADAR_DETECTED, 227 GFP_KERNEL); 228 } 229 break; 230 default: 231 break; 232 } 233 234 evt_buf += (tlv_len + sizeof(rpt->header)); 235 event_len -= (tlv_len + sizeof(rpt->header)); 236 } 237 238 return 0; 239 } 240 241 /* Handler for radar detected event from FW.*/ 242 int mwifiex_11h_handle_radar_detected(struct mwifiex_private *priv, 243 struct sk_buff *skb) 244 { 245 struct mwifiex_radar_det_event *rdr_event; 246 247 rdr_event = (void *)(skb->data + sizeof(u32)); 248 249 mwifiex_dbg(priv->adapter, MSG, 250 "radar detected; indicating kernel\n"); 251 if (mwifiex_stop_radar_detection(priv, &priv->dfs_chandef)) 252 mwifiex_dbg(priv->adapter, ERROR, 253 "Failed to stop CAC in FW\n"); 254 cfg80211_radar_event(priv->adapter->wiphy, &priv->dfs_chandef, 255 GFP_KERNEL); 256 mwifiex_dbg(priv->adapter, MSG, "regdomain: %d\n", 257 rdr_event->reg_domain); 258 mwifiex_dbg(priv->adapter, MSG, "radar detection type: %d\n", 259 rdr_event->det_type); 260 261 return 0; 262 } 263 264 /* This is work queue function for channel switch handling. 265 * This function takes care of updating new channel definitin to 266 * bss config structure, restart AP and indicate channel switch success 267 * to cfg80211. 268 */ 269 void mwifiex_dfs_chan_sw_work_queue(struct work_struct *work) 270 { 271 struct mwifiex_uap_bss_param *bss_cfg; 272 struct delayed_work *delayed_work = to_delayed_work(work); 273 struct mwifiex_private *priv = 274 container_of(delayed_work, struct mwifiex_private, 275 dfs_chan_sw_work); 276 277 bss_cfg = &priv->bss_cfg; 278 if (!bss_cfg->beacon_period) { 279 mwifiex_dbg(priv->adapter, ERROR, 280 "channel switch: AP already stopped\n"); 281 return; 282 } 283 284 mwifiex_uap_set_channel(priv, bss_cfg, priv->dfs_chandef); 285 286 if (mwifiex_config_start_uap(priv, bss_cfg)) { 287 mwifiex_dbg(priv->adapter, ERROR, 288 "Failed to start AP after channel switch\n"); 289 return; 290 } 291 292 mwifiex_dbg(priv->adapter, MSG, 293 "indicating channel switch completion to kernel\n"); 294 mutex_lock(&priv->wdev.mtx); 295 cfg80211_ch_switch_notify(priv->netdev, &priv->dfs_chandef, 0); 296 mutex_unlock(&priv->wdev.mtx); 297 } 298