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
mwifiex_init_11h_params(struct mwifiex_private * priv)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
mwifiex_is_11h_active(struct mwifiex_private * priv)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
mwifiex_11h_process_infra_join(struct mwifiex_private * priv,u8 ** buffer,struct mwifiex_bssdescriptor * bss_desc)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 */
mwifiex_11h_activate(struct mwifiex_private * priv,bool flag)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 */
mwifiex_11h_process_join(struct mwifiex_private * priv,u8 ** buffer,struct mwifiex_bssdescriptor * bss_desc)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 */
mwifiex_dfs_cac_work_queue(struct work_struct * work)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 */
mwifiex_cmd_issue_chan_report_request(struct mwifiex_private * priv,struct host_cmd_ds_command * cmd,void * data_buf)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
mwifiex_stop_radar_detection(struct mwifiex_private * priv,struct cfg80211_chan_def * chandef)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 */
mwifiex_abort_cac(struct mwifiex_private * priv)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 */
mwifiex_11h_handle_chanrpt_ready(struct mwifiex_private * priv,struct sk_buff * skb)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.*/
mwifiex_11h_handle_radar_detected(struct mwifiex_private * priv,struct sk_buff * skb)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 */
mwifiex_dfs_chan_sw_work_queue(struct work_struct * work)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