424 lines
19 KiB
C
424 lines
19 KiB
C
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#include "wifi_hal.h"
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#ifndef __WIFI_HAL_GSCAN_H__
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#define __WIFI_HAL_GSCAN_H__
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/* AP Scans */
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typedef enum {
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WIFI_BAND_UNSPECIFIED,
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WIFI_BAND_BG = 1, // 2.4 GHz
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WIFI_BAND_A = 2, // 5 GHz without DFS
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WIFI_BAND_A_DFS = 4, // 5 GHz DFS only
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WIFI_BAND_A_WITH_DFS = 6, // 5 GHz with DFS
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WIFI_BAND_ABG = 3, // 2.4 GHz + 5 GHz; no DFS
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WIFI_BAND_ABG_WITH_DFS = 7, // 2.4 GHz + 5 GHz with DFS
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} wifi_band;
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const unsigned MAX_CHANNELS = 16;
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const unsigned MAX_BUCKETS = 16;
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const unsigned MAX_HOTLIST_APS = 128;
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const unsigned MAX_SIGNIFICANT_CHANGE_APS = 64;
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const unsigned MAX_PNO_SSID = 128;
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const unsigned MAX_HOTLIST_SSID = 8;
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const unsigned MAX_BLACKLIST_BSSID = 16;
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wifi_error wifi_get_valid_channels(wifi_interface_handle handle,
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int band, int max_channels, wifi_channel *channels, int *num_channels);
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typedef struct {
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int max_scan_cache_size; // total space allocated for scan (in bytes)
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int max_scan_buckets; // maximum number of channel buckets
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int max_ap_cache_per_scan; // maximum number of APs that can be stored per scan
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int max_rssi_sample_size; // number of RSSI samples used for averaging RSSI
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int max_scan_reporting_threshold; // max possible report_threshold as described
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// in wifi_scan_cmd_params
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int max_hotlist_bssids; // maximum number of entries for hotlist BSSIDs
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int max_hotlist_ssids; // maximum number of entries for hotlist SSIDs
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int max_significant_wifi_change_aps; // maximum number of entries for
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// significant wifi change APs
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int max_bssid_history_entries; // number of BSSID/RSSI entries that device can hold
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int max_number_epno_networks; //max number of epno entries if crc32 is specified
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int max_number_epno_networks_by_ssid; //max number of epno entries if ssid is specified
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int max_number_of_white_losted_ssid; //max number of white listed SSIDs, M target is 2 to 4 */
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} wifi_gscan_capabilities;
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wifi_error wifi_get_gscan_capabilities(wifi_interface_handle handle,
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wifi_gscan_capabilities *capabilities);
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typedef enum {
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WIFI_SCAN_BUFFER_FULL,
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WIFI_SCAN_COMPLETE,
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} wifi_scan_event;
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/* Format of information elements found in the beacon */
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typedef struct {
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byte id; // element identifier
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byte len; // number of bytes to follow
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byte data[];
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} wifi_information_element;
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typedef struct {
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wifi_timestamp ts; // time since boot (in microsecond) when the result was
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// retrieved
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char ssid[32+1]; // null terminated
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mac_addr bssid;
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wifi_channel channel; // channel frequency in MHz
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wifi_rssi rssi; // in db
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wifi_timespan rtt; // in nanoseconds
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wifi_timespan rtt_sd; // standard deviation in rtt
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unsigned short beacon_period; // period advertised in the beacon
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unsigned short capability; // capabilities advertised in the beacon
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unsigned int ie_length; // size of the ie_data blob
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char ie_data[1]; // blob of all the information elements found in the
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// beacon; this data should be a packed list of
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// wifi_information_element objects, one after the other.
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// other fields
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} wifi_scan_result;
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typedef struct {
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/* reported when report_threshold is reached in scan cache */
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void (*on_scan_results_available) (wifi_request_id id, unsigned num_results_available);
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/* reported when each probe response is received, if report_events
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* enabled in wifi_scan_cmd_params */
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void (*on_full_scan_result) (wifi_request_id id, wifi_scan_result *result);
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/* optional event - indicates progress of scanning statemachine */
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void (*on_scan_event) (wifi_scan_event event, unsigned status);
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} wifi_scan_result_handler;
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typedef struct {
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wifi_channel channel; // frequency
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int dwellTimeMs; // dwell time hint
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int passive; // 0 => active, 1 => passive scan; ignored for DFS
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/* Add channel class */
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} wifi_scan_channel_spec;
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typedef struct {
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int bucket; // bucket index, 0 based
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wifi_band band; // when UNSPECIFIED, use channel list
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int period; // desired period, in millisecond; if this is too
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// low, the firmware should choose to generate results as
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// fast as it can instead of failing the command.
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// for exponential backoff bucket this is the min_period
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/* report_events semantics -
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* 0 => report only when scan history is % full
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* 1 => same as 0 + report a scan completion event after scanning this bucket
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* 2 => same as 1 + forward scan results (beacons/probe responses + IEs) in real time to HAL
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* 3 => same as 2 + forward scan results (beacons/probe responses + IEs) in real time to
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supplicant as well (optional) .
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*/
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byte report_events;
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int max_period; // if max_period is non zero or different than period, then this bucket is
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// an exponential backoff bucket and the scan period will grow exponentially
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// as per formula: actual_period(N) = period ^ (N/(step_count+1))
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// to a maximum period of max_period
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int exponent; // for exponential back off bucket: multiplier: new_period = old_period * exponent
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int step_count; // for exponential back off bucket, number of scans performed at a given
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// period and until the exponent is applied
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int num_channels;
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// channels to scan; these may include DFS channels
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// Note that a given channel may appear in multiple buckets
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wifi_scan_channel_spec channels[MAX_CHANNELS];
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} wifi_scan_bucket_spec;
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typedef struct {
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int base_period; // base timer period in ms
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int max_ap_per_scan; // number of APs to store in each scan ientryn the
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// BSSID/RSSI history buffer (keep the highest RSSI APs)
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int report_threshold_percent; // in %, when scan buffer is this much full, wake up AP
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int report_threshold_num_scans; // in number of scans, wake up AP after these many scans
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int num_buckets;
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wifi_scan_bucket_spec buckets[MAX_BUCKETS];
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} wifi_scan_cmd_params;
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/* Start periodic GSCAN */
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wifi_error wifi_start_gscan(wifi_request_id id, wifi_interface_handle iface,
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wifi_scan_cmd_params params, wifi_scan_result_handler handler);
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/* Stop periodic GSCAN */
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wifi_error wifi_stop_gscan(wifi_request_id id, wifi_interface_handle iface);
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typedef enum {
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WIFI_SCAN_FLAG_INTERRUPTED = 1 // Indicates that scan results are not complete because
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// probes were not sent on some channels
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} wifi_scan_flags;
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/* Get the GSCAN cached scan results */
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typedef struct {
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int scan_id; // a unique identifier for the scan unit
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int flags; // a bitmask with additional information about scan
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int num_results; // number of bssids retrieved by the scan
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wifi_scan_result *results; // scan results - one for each bssid
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} wifi_cached_scan_results;
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wifi_error wifi_get_cached_gscan_results(wifi_interface_handle iface, byte flush,
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int max, wifi_cached_scan_results *results, int *num);
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/* BSSID Hotlist */
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typedef struct {
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void (*on_hotlist_ap_found)(wifi_request_id id,
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unsigned num_results, wifi_scan_result *results);
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void (*on_hotlist_ap_lost)(wifi_request_id id,
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unsigned num_results, wifi_scan_result *results);
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} wifi_hotlist_ap_found_handler;
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typedef struct {
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mac_addr bssid; // AP BSSID
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wifi_rssi low; // low threshold
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wifi_rssi high; // high threshold
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} ap_threshold_param;
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typedef struct {
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int lost_ap_sample_size;
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int num_bssid; // number of hotlist APs
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ap_threshold_param ap[MAX_HOTLIST_APS]; // hotlist APs
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} wifi_bssid_hotlist_params;
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/* Set the BSSID Hotlist */
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wifi_error wifi_set_bssid_hotlist(wifi_request_id id, wifi_interface_handle iface,
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wifi_bssid_hotlist_params params, wifi_hotlist_ap_found_handler handler);
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/* Clear the BSSID Hotlist */
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wifi_error wifi_reset_bssid_hotlist(wifi_request_id id, wifi_interface_handle iface);
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/* SSID Hotlist */
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typedef struct {
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void (*on_hotlist_ssid_found)(wifi_request_id id,
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unsigned num_results, wifi_scan_result *results);
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void (*on_hotlist_ssid_lost)(wifi_request_id id,
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unsigned num_results, wifi_scan_result *results);
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} wifi_hotlist_ssid_handler;
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typedef struct {
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char ssid[32+1]; // SSID
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wifi_band band; // band for this set of threshold params
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wifi_rssi low; // low threshold
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wifi_rssi high; // high threshold
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} ssid_threshold_param;
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typedef struct {
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int lost_ssid_sample_size;
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int num_ssid; // number of hotlist SSIDs
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ssid_threshold_param ssid[MAX_HOTLIST_SSID]; // hotlist SSIDs
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} wifi_ssid_hotlist_params;
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/* Set the SSID Hotlist */
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wifi_error wifi_set_ssid_hotlist(wifi_request_id id, wifi_interface_handle iface,
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wifi_ssid_hotlist_params params, wifi_hotlist_ssid_handler handler);
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/* Clear the SSID Hotlist */
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wifi_error wifi_reset_ssid_hotlist(wifi_request_id id, wifi_interface_handle iface);
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/* BSSID blacklist */
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typedef struct {
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int num_bssid; // number of blacklisted BSSIDs
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mac_addr bssids[MAX_BLACKLIST_BSSID]; // blacklisted BSSIDs
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} wifi_bssid_params;
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/* Set the BSSID blacklist */
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wifi_error wifi_set_bssid_blacklist(wifi_request_id id, wifi_interface_handle iface,
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wifi_bssid_params params);
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/* Significant wifi change */
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typedef struct {
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mac_addr bssid; // BSSID
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wifi_channel channel; // channel frequency in MHz
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int num_rssi; // number of rssi samples
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wifi_rssi rssi[]; // RSSI history in db
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} wifi_significant_change_result;
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typedef struct {
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void (*on_significant_change)(wifi_request_id id,
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unsigned num_results, wifi_significant_change_result **results);
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} wifi_significant_change_handler;
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// The sample size parameters in the wifi_significant_change_params structure
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// represent the number of occurence of a g-scan where the BSSID was seen and RSSI was
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// collected for that BSSID, or, the BSSID was expected to be seen and didn't.
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// for instance: lost_ap_sample_size : number of time a g-scan was performed on the
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// channel the BSSID was seen last, and the BSSID was not seen during those g-scans
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typedef struct {
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int rssi_sample_size; // number of samples for averaging RSSI
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int lost_ap_sample_size; // number of samples to confirm AP loss
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int min_breaching; // number of APs breaching threshold
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int num_bssid; // max 64
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ap_threshold_param ap[MAX_SIGNIFICANT_CHANGE_APS];
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} wifi_significant_change_params;
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/* Set the Signifcant AP change list */
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wifi_error wifi_set_significant_change_handler(wifi_request_id id, wifi_interface_handle iface,
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wifi_significant_change_params params, wifi_significant_change_handler handler);
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/* Clear the Signifcant AP change list */
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wifi_error wifi_reset_significant_change_handler(wifi_request_id id, wifi_interface_handle iface);
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/* Random MAC OUI for PNO */
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wifi_error wifi_set_scanning_mac_oui(wifi_interface_handle handle, oui scan_oui);
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// Whether directed scan needs to be performed (for hidden SSIDs)
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#define WIFI_PNO_FLAG_DIRECTED_SCAN = 1
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// Whether PNO event shall be triggered if the network is found on A band
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#define WIFI_PNO_FLAG_A_BAND = 2
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// Whether PNO event shall be triggered if the network is found on G band
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#define WIFI_PNO_FLAG_G_BAND = 4
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// Whether strict matching is required (i.e. firmware shall not match on the entire SSID)
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#define WIFI_PNO_FLAG_STRICT_MATCH = 8
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// Code for matching the beacon AUTH IE - additional codes TBD
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#define WIFI_PNO_AUTH_CODE_OPEN 1 // open
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#define WIFI_PNO_AUTH_CODE_PSK 2 // WPA_PSK or WPA2PSK
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#define WIFI_PNO_AUTH_CODE_EAPOL 4 // any EAPOL
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// Enhanced PNO:
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// Enhanced PNO feature is expected to be enabled all of the time (e.g. screen lit) and may thus
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// requires firmware to store a large number of networks, covering the whole list of known network.
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// Therefore, it is acceptable for firmware to store a crc24, crc32 or other short hash of the SSID,
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// such that a low but non-zero probability of collision exist. With that scheme it should be
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// possible for firmware to keep an entry as small as 4 bytes for each pno network.
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// For instance, a firmware pn0 entry can be implemented in the form of:
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// PNO ENTRY = crc24(3 bytes) | RSSI_THRESHOLD>>3 (5 bits) | auth flags(3 bits)
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//
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// A PNO network shall be reported once, that is, once a network is reported by firmware
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// its entry shall be marked as "done" until framework calls wifi_set_epno_list again.
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// Calling wifi_set_epno_list shall reset the "done" status of pno networks in firmware.
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typedef struct {
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char ssid[32+1];
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char rssi_threshold; // threshold for considering this SSID as found, required granularity for
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// this threshold is 4dBm to 8dBm
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char flags; // WIFI_PNO_FLAG_XXX
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char auth_bit_field; // auth bit field for matching WPA IE
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} wifi_epno_network;
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/* PNO list */
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typedef struct {
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int num_networks; // number of SSIDs
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wifi_epno_network networks[]; // PNO networks
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} wifi_epno_params;
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typedef struct {
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// on results
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void (*on_network_found)(wifi_request_id id,
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unsigned num_results, wifi_scan_result *results);
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} wifi_epno_handler;
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/* Set the PNO list */
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wifi_error wifi_set_epno_list(wifi_request_id id, wifi_interface_handle iface,
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int num_networks, wifi_epno_network *networks, wifi_epno_handler handler);
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/* SSID white list */
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/* Note that this feature requires firmware to be able to indicate to kernel sme and wpa_supplicant
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* that the SSID of the network has changed
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* and thus requires further changed in cfg80211 stack, for instance,
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* the below function would change:
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void __cfg80211_roamed(struct wireless_dev *wdev,
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struct cfg80211_bss *bss,
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const u8 *req_ie, size_t req_ie_len,
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const u8 *resp_ie, size_t resp_ie_len)
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* when firmware roam to a new SSID the corresponding link layer stats info need to be updated:
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struct wifi_interface_link_layer_info;
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*/
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typedef struct {
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char ssid[32+1]; // null terminated
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} wifi_ssid;
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wifi_error wifi_set_ssid_white_list(wifi_request_id id, wifi_interface_handle iface,
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int num_networks, wifi_ssid *ssids);
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/* Set G-SCAN roam parameters */
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/**
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* Firmware roaming is implemented with two modes:
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* 1- "Alert" mode roaming, (Note: alert roaming is the pre-L roaming, whereas firmware is
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* "urgently" hunting for another BSSID because the RSSI is low, or because many successive
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* beacons have been lost or other bad link conditions).
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* 2- "Lazy" mode, where firmware is hunting for a better BSSID or white listed SSID even though
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* the RSSI of the link is good.
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* Lazy mode is configured thru G-scan, that is, the results of G-scans are compared to the
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* current RSSI and fed thru the roaming engine.
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* Lazy scan will be enabled (and or throttled down by reducing the number of G-scans) by
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* framework only in certain conditions, such as:
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* - no real time (VO/VI) traffic at the interface
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* - low packet rate for BE/BK packets a the interface
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* - system conditions (screen lit/dark) etc...
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*
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* For consistency, the roam parameters will always be configured by framework such that:
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*
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* condition 1- A_band_boost_threshold >= (alert_roam_rssi_trigger + 10)
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* This condition ensures that Lazy roam doesn't cause the device to roam to a 5GHz BSSID whose RSSI
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* is lower than the alert threshold, which would consequently trigger a roam to a low RSSI BSSID,
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* hence triggering alert mode roaming.
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* In other words, in alert mode, the A_band parameters may safely be ignored by WiFi chipset.
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*
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* condition 2- A_band_boost_threshold > A_band_penalty_factor
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*
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*/
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/**
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* Example:
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* A_band_boost_threshold = -65
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* A_band_penalty_threshold = -75
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* A_band_boost_factor = 4
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* A_band_penalty_factor = 2
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* A_band_max_boost = 50
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*
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* a 5GHz RSSI value is transformed as below:
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* -20 -> -20+ 50 = 30
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* -60 -> -60 + 4 * (-60 - A_band_boost_threshold) = -60 + 16 = -44
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* -70 -> -70
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* -80 -> -80 - 2 * (A_band_penalty_threshold - (-80)) = -80 - 10 = -90
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*/
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typedef struct {
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// Lazy roam parameters
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// A_band_XX parameters are applied to 5GHz BSSIDs when comparing with a 2.4GHz BSSID
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// they may not be applied when comparing two 5GHz BSSIDs
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int A_band_boost_threshold; // RSSI threshold above which 5GHz RSSI is favored
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int A_band_penalty_threshold; // RSSI threshold below which 5GHz RSSI is penalized
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int A_band_boost_factor; // factor by which 5GHz RSSI is boosted
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// boost=RSSI_measured-5GHz_boost_threshold)*5GHz_boost_factor
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int A_band_penalty_factor; // factor by which 5GHz RSSI is penalized
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// penalty=(5GHz_penalty_factor-RSSI_measured)*5GHz_penalty_factor
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int A_band_max_boost; // maximum boost that can be applied to a 5GHz RSSI
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// Hysteresis: ensuring the currently associated BSSID is favored
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// so as to prevent ping-pong situations
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int lazy_roam_hysteresis; // boost applied to current BSSID
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// Alert mode enable, i.e. configuring when firmware enters alert mode
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int alert_roam_rssi_trigger; // RSSI below which "Alert" roam is enabled
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} wifi_roam_params;
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wifi_error wifi_set_gscan_roam_params(wifi_request_id id, wifi_interface_handle iface,
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wifi_roam_params * params);
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/**
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* Enable/Disable "Lazy" roam
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*/
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wifi_error wifi_enable_lazy_roam(wifi_request_id id, wifi_interface_handle iface, int enable);
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/**
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* Per BSSID preference
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*/
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typedef struct {
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mac_addr bssid;
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int rssi_modifier; // modifier applied to the RSSI of the BSSID for the purpose of comparing
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// it with other roam candidate
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} wifi_bssid_preference;
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wifi_error wifi_set_bssid_preference(wifi_request_id id, wifi_interface_handle iface,
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int num_bssid, wifi_bssid_preference *prefs);
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#endif
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