Outline ![]()
Files ![]()
loading (4/5)...
SourceVu![]()
ESP-IDF Framework and Examples![]()
ESP-IDF![]()
components/wpa_supplicant/esp_supplicant/src/esp_scan.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
/*
* SPDX-FileCopyrightText: 2020-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "common/ieee802_11_defs.h"
#include "common/wpa_supplicant_i.h"
#include "utils/wpa_debug.h"
#include "esp_wifi_driver.h"
#include "esp_wifi_types.h"
#include "drivers/driver.h"
#include "common/scan.h"
#include "common/bss.h"
#include "common/rrm.h"
#include "common/ieee802_11_common.h"
#include "esp_common_i.h"
#include "esp_scan_i.h"
#include "common/wnm_sta.h"
#include "esp_scan_i.h"
#include "esp_common_i.h"
extern struct wpa_supplicant g_wpa_supp;
static void scan_done_event_handler(void *arg, ETS_STATUS status)
{
struct wpa_supplicant *wpa_s = &g_wpa_supp;
/* update last scan time */
wpa_s->scan_start_tsf = esp_wifi_get_tsf_time(WIFI_IF_STA);
if (wpa_s->scanning) {
wpa_s->type &= ~(1 << WLAN_FC_STYPE_BEACON) & ~(1 << WLAN_FC_STYPE_PROBE_RESP);
esp_wifi_register_mgmt_frame_internal(wpa_s->type, wpa_s->subtype);
}
esp_supplicant_handle_scan_done_evt();
}
#if defined(CONFIG_WNM)
static void handle_wnm_scan_done(struct wpa_supplicant *wpa_s)
{
struct wpa_bss *bss = wpa_bss_get_next_bss(wpa_s, wpa_s->current_bss);
if (wpa_s->wnm_neighbor_report_elements) {
wnm_scan_process(wpa_s, 1);
} else if (wpa_s->wnm_dissoc_timer) {
if (wpa_s->num_bss == 1) {
wpa_printf(MSG_INFO, "not able to find another candidate, do nothing");
return;
}
/* this is a already matched bss */
if (bss) {
wnm_bss_tm_connect(wpa_s, bss, NULL, 1);
}
}
}
#endif
static void scan_done_cleanup(struct wpa_supplicant *wpa_s)
{
wpa_s->scanning = 0;
wpa_s->scan_reason = 0;
/* clean scan list from net80211 */
esp_wifi_clear_ap_list();
}
void esp_supplicant_handle_scan_done_evt(void)
{
struct wpa_supplicant *wpa_s = &g_wpa_supp;
wpa_printf(MSG_INFO, "scan done received");
#if defined(CONFIG_RRM)
/* Check which module started this, call the respective function */
if (wpa_s->scan_reason == REASON_RRM_BEACON_REPORT) {
wpas_beacon_rep_scan_process(wpa_s, wpa_s->scan_start_tsf);
}
#endif
#if defined(CONFIG_WNM)
if (wpa_s->scan_reason == REASON_WNM_BSS_TRANS_REQ) {
handle_wnm_scan_done(wpa_s);
}
#endif
if (wpa_s->scanning) {
scan_done_cleanup(wpa_s);
}
wpa_bss_update_end(wpa_s);
#ifndef SCAN_CACHE_SUPPORTED
wpa_bss_flush(wpa_s);
#endif
}
void esp_scan_init(struct wpa_supplicant *wpa_s)
{
wpa_s->scanning = 0;
wpa_bss_init(wpa_s);
wpa_s->last_scan_res = NULL;
wpa_s->last_scan_res_used = 0;
}
void esp_scan_deinit(struct wpa_supplicant *wpa_s)
{
wpa_bss_deinit(wpa_s);
os_free(wpa_s->last_scan_res);
wpa_s->last_scan_res = NULL;
wpa_s->last_scan_res_used = 0;
}
int esp_handle_beacon_probe(u8 type, u8 *frame, size_t len, u8 *sender,
int8_t rssi, u8 channel, u64 current_tsf)
{
struct wpa_supplicant *wpa_s = &g_wpa_supp;
struct os_reltime now;
struct wpa_scan_res *res;
u8 *ptr;
if (len < 12) {
wpa_printf(MSG_ERROR, "beacon/probe is having short len=%d", len);
return -1;
}
res = os_zalloc(sizeof(struct wpa_scan_res) + len - 12);
if (!res) {
wpa_printf(MSG_ERROR, "failed to allocate memory");
return -1;
}
ptr = (u8 *)res;
os_get_time(&now);
os_memcpy(res->bssid, sender, ETH_ALEN);
res->tsf = WPA_GET_LE64(frame);
frame += 8;
len -= 8;
if ((wpa_s->scan_start_tsf == 0) &&
wpa_s->current_bss &&
(os_memcmp(wpa_s->current_bss, sender, ETH_ALEN) == 0)) {
wpa_s->scan_start_tsf = res->tsf;
os_memcpy(wpa_s->tsf_bssid, sender, ETH_ALEN);
}
res->beacon_int = WPA_GET_LE16(frame);
frame += 2;
len -= 2;
res->caps = WPA_GET_LE16(frame);
frame += 2;
len -= 2;
res->chan = channel;
res->noise = 0;
res->level = rssi;
os_memcpy(res->tsf_bssid, wpa_s->tsf_bssid, ETH_ALEN);
res->parent_tsf = current_tsf - wpa_s->scan_start_tsf;
res->ie_len = len;
ptr += sizeof(struct wpa_scan_res);
/* update rest of the frame */
os_memcpy(ptr, frame, len);
wpa_bss_update_scan_res(wpa_s, res, &now);
os_get_reltime(&wpa_s->last_scan);
os_free(res);
return 0;
}
#ifdef CONFIG_WNM
static void get_scan_channel_bitmap(struct wpa_supplicant *wpa_s, wifi_scan_config_t *params)
{
const int MAX_2GHZ_CHANNEL = 14;
if (!wpa_s->wnm_num_neighbor_report) {
wpa_printf(MSG_DEBUG, "No Neighbor Report to gather scan channel list");
return;
}
params->channel_bitmap.ghz_2_channels = 0;
params->channel_bitmap.ghz_5_channels = 0;
for (int i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
struct neighbor_report *nei = &wpa_s->wnm_neighbor_report_elements[i];
if (nei->channel_number <= MAX_2GHZ_CHANNEL) {
params->channel_bitmap.ghz_2_channels |= CHANNEL_TO_BIT(nei->channel_number);
} else {
params->channel_bitmap.ghz_5_channels |= CHANNEL_TO_BIT(nei->channel_number);
}
}
}
#endif /*CONFIG_WNM*/
static int issue_scan(struct wpa_supplicant *wpa_s,
struct wpa_driver_scan_params *scan_params)
{
wifi_scan_config_t *params = NULL;
int ret = 0;
u64 scan_start_tsf = esp_wifi_get_tsf_time(WIFI_IF_STA);
/* TODO: Directly try to connect if scan results are recent */
if ((scan_start_tsf - wpa_s->scan_start_tsf) > 100000) {
wpa_printf(MSG_DEBUG, "flushing old scan cache %llu",
(scan_start_tsf - wpa_s->scan_start_tsf));
wpa_bss_flush(wpa_s);
}
esp_wifi_get_macaddr_internal(WIFI_IF_STA, wpa_s->tsf_bssid);
if (scan_params) {
params = os_zalloc(sizeof(wifi_scan_config_t));
if (!params) {
wpa_printf(MSG_ERROR, "failed to allocate memory");
return -1;
}
if (scan_params->num_ssids) {
params->ssid = os_zalloc(scan_params->ssids[0].ssid_len + 1);
if (!params->ssid) {
wpa_printf(MSG_ERROR, "failed to allocate memory");
ret = -1;
goto cleanup;
}
os_memcpy(params->ssid, scan_params->ssids[0].ssid, scan_params->ssids[0].ssid_len);
} else
if (scan_params->mode == BEACON_REPORT_MODE_PASSIVE) {
params->scan_type = WIFI_SCAN_TYPE_PASSIVE;
} else {
params->scan_type = WIFI_SCAN_TYPE_ACTIVE;
}
if (scan_params->bssid) {
params->bssid = os_zalloc(ETH_ALEN);
if (!params->bssid) {
wpa_printf(MSG_ERROR, "failed to allocate memory");
ret = -1;
goto cleanup;
}
os_memcpy(params->bssid, scan_params->bssid, ETH_ALEN);
}
if (scan_params->channel) {
params->channel = scan_params->channel;
}
#ifdef CONFIG_WNM
else {
get_scan_channel_bitmap(wpa_s, params);
}
#endif /*CONFIG_WNM*/
if (scan_params->duration) {
params->scan_time.passive = scan_params->duration;
params->scan_time.active.min = scan_params->duration;
params->scan_time.active.max = scan_params->duration;
} else {
params->scan_time.active.min = SUPPLICANT_SCAN_ACTIVE_SCAN_MIN_DURATION;
params->scan_time.active.max = SUPPLICANT_SCAN_ACTIVE_SCAN_MAX_DURATION;
}
}
wpa_s->scan_start_tsf = scan_start_tsf;
/* Register frames to come to supplicant when we park on channel */
wpa_s->type |= (1 << WLAN_FC_STYPE_BEACON) | (1 << WLAN_FC_STYPE_PROBE_RESP);
esp_wifi_register_mgmt_frame_internal(wpa_s->type, wpa_s->subtype);
typedef void (* scan_done_cb_t)(void *arg, ETS_STATUS status);
extern int esp_wifi_promiscuous_scan_start(wifi_scan_config_t *config, scan_done_cb_t cb);
/* issue scan */
if (esp_wifi_promiscuous_scan_start(params, scan_done_event_handler) < 0) {
ret = -1;
goto cleanup;
}
wpa_s->scanning = 1;
wpa_bss_update_start(wpa_s);
wpa_printf(MSG_INFO, "scan issued at time=%llu", wpa_s->scan_start_tsf);
cleanup:
if (params) {
if (params->ssid) {
os_free(params->ssid);
}
if (params->bssid) {
os_free(params->bssid);
}
os_free(params);
}
return ret;
}
/**
* wpa_supplicant_trigger_scan - Request driver to start a scan
* @wpa_s: Pointer to wpa_supplicant data
* @params: Scan parameters
* Returns: 0 on success, -1 on failure
*/
int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
struct wpa_driver_scan_params *params)
{
return issue_scan(wpa_s, params);
}
void wpa_scan_results_free(struct wpa_scan_results *res)
{
size_t i;
if (res == NULL) {
return;
}
for (i = 0; i < res->num; i++) {
os_free(res->res[i]);
}
os_free(res->res);
os_free(res);
}
Details ![]()
Show: from Types: Columns: ![]( "Show Project Names")
![]( "Show Locations")
![]( "Show Referring Symbols")
![]( "Show Scope")
This file uses the notable symbols shown below. Click anywhere in the file to view more details.