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 12void 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 18inline 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 */ 25static void 26mwifiex_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 */ 70int 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 */ 88void 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 */ 111void 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 */ 132int 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 159int 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 */ 175void 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 */ 193int 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 u16 event_len, tlv_len; 199 200 rpt_event = (void *)(skb->data + sizeof(u32)); 201 event_len = skb->len - (sizeof(struct host_cmd_ds_chan_rpt_event)+ 202 sizeof(u32)); 203 204 if (le32_to_cpu(rpt_event->result) != HostCmd_RESULT_OK) { 205 mwifiex_dbg(priv->adapter, ERROR, 206 "Error in channel report event\n"); 207 return -1; 208 } 209 210 while (event_len >= sizeof(struct mwifiex_ie_types_header)) { 211 rpt = (void *)&rpt_event->tlvbuf; 212 tlv_len = le16_to_cpu(rpt->header.len); 213 214 switch (le16_to_cpu(rpt->header.type)) { 215 case TLV_TYPE_CHANRPT_11H_BASIC: 216 if (rpt->map.radar) { 217 mwifiex_dbg(priv->adapter, MSG, 218 "RADAR Detected on channel %d!\n", 219 priv->dfs_chandef.chan->hw_value); 220 cancel_delayed_work_sync(&priv->dfs_cac_work); 221 cfg80211_cac_event(priv->netdev, 222 &priv->dfs_chandef, 223 NL80211_RADAR_DETECTED, 224 GFP_KERNEL); 225 } 226 break; 227 default: 228 break; 229 } 230 231 event_len -= (tlv_len + sizeof(rpt->header)); 232 } 233 234 return 0; 235} 236 237/* Handler for radar detected event from FW.*/ 238int mwifiex_11h_handle_radar_detected(struct mwifiex_private *priv, 239 struct sk_buff *skb) 240{ 241 struct mwifiex_radar_det_event *rdr_event; 242 243 rdr_event = (void *)(skb->data + sizeof(u32)); 244 245 mwifiex_dbg(priv->adapter, MSG, 246 "radar detected; indicating kernel\n"); 247 if (mwifiex_stop_radar_detection(priv, &priv->dfs_chandef)) 248 mwifiex_dbg(priv->adapter, ERROR, 249 "Failed to stop CAC in FW\n"); 250 cfg80211_radar_event(priv->adapter->wiphy, &priv->dfs_chandef, 251 GFP_KERNEL); 252 mwifiex_dbg(priv->adapter, MSG, "regdomain: %d\n", 253 rdr_event->reg_domain); 254 mwifiex_dbg(priv->adapter, MSG, "radar detection type: %d\n", 255 rdr_event->det_type); 256 257 return 0; 258} 259 260/* This is work queue function for channel switch handling. 261 * This function takes care of updating new channel definitin to 262 * bss config structure, restart AP and indicate channel switch success 263 * to cfg80211. 264 */ 265void mwifiex_dfs_chan_sw_work_queue(struct work_struct *work) 266{ 267 struct mwifiex_uap_bss_param *bss_cfg; 268 struct delayed_work *delayed_work = to_delayed_work(work); 269 struct mwifiex_private *priv = 270 container_of(delayed_work, struct mwifiex_private, 271 dfs_chan_sw_work); 272 273 bss_cfg = &priv->bss_cfg; 274 if (!bss_cfg->beacon_period) { 275 mwifiex_dbg(priv->adapter, ERROR, 276 "channel switch: AP already stopped\n"); 277 return; 278 } 279 280 mwifiex_uap_set_channel(priv, bss_cfg, priv->dfs_chandef); 281 282 if (mwifiex_config_start_uap(priv, bss_cfg)) { 283 mwifiex_dbg(priv->adapter, ERROR, 284 "Failed to start AP after channel switch\n"); 285 return; 286 } 287 288 mwifiex_dbg(priv->adapter, MSG, 289 "indicating channel switch completion to kernel\n"); 290 wiphy_lock(priv->wdev.wiphy); 291 cfg80211_ch_switch_notify(priv->netdev, &priv->dfs_chandef, 0); 292 wiphy_unlock(priv->wdev.wiphy); 293} 294