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esp-idf/components/wpa_supplicant/esp_supplicant/src/esp_scan.c

307 wiersze
8.9 KiB
C
Czysty Wina Historia

/*
* 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);
}
#ifdef CONFIG_SUPPLICANT_TASK
if (esp_supplicant_post_evt(SIG_SUPPLICANT_SCAN_DONE, 0) != 0) {
wpa_printf(MSG_ERROR, "Posting of scan done failed!");
}
#else
esp_supplicant_handle_scan_done_evt();
#endif /*CONFIG_SUPPLICANT_TASK*/
}
#if defined(CONFIG_IEEE80211KV)
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_IEEE80211KV)
/* 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);
} else 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
void get_scan_channel_bitmap(struct wpa_supplicant *wpa_s, wifi_scan_config_t *params)
{
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;
for (int i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
struct neighbor_report *nei;
nei = &wpa_s->wnm_neighbor_report_elements[i];
params->channel_bitmap.ghz_2_channels |= (1 << 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);
}
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