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
mwifiex_init_11h_params(struct mwifiex_private * priv)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
mwifiex_is_11h_active(struct mwifiex_private * priv)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
mwifiex_11h_process_infra_join(struct mwifiex_private * priv,u8 ** buffer,struct mwifiex_bssdescriptor * bss_desc)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 */
mwifiex_11h_activate(struct mwifiex_private * priv,bool flag)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 */
mwifiex_11h_process_join(struct mwifiex_private * priv,u8 ** buffer,struct mwifiex_bssdescriptor * bss_desc)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 */
mwifiex_dfs_cac_work_queue(struct work_struct * work)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 */
mwifiex_cmd_issue_chan_report_request(struct mwifiex_private * priv,struct host_cmd_ds_command * cmd,void * data_buf)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
mwifiex_stop_radar_detection(struct mwifiex_private * priv,struct cfg80211_chan_def * chandef)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 */
mwifiex_abort_cac(struct mwifiex_private * priv)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 */
mwifiex_11h_handle_chanrpt_ready(struct mwifiex_private * priv,struct sk_buff * skb)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.*/
mwifiex_11h_handle_radar_detected(struct mwifiex_private * priv,struct sk_buff * skb)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 */
mwifiex_dfs_chan_sw_work_queue(struct work_struct * work)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 mutex_lock(&priv->wdev.mtx);
307 cfg80211_ch_switch_notify(priv->netdev, &priv->dfs_chandef, 0, 0);
308 mutex_unlock(&priv->wdev.mtx);
309 }
310