430 lines
22 KiB
C
430 lines
22 KiB
C
#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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// Define static_assert() unless already defined by compiler.
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#ifndef __has_feature
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#define __has_feature(__x) 0
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#endif
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#if !(__has_feature(cxx_static_assert)) && !defined(static_assert)
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#define static_assert(__b, __m) \
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extern int compile_time_assert_failed[ ( __b ) ? 1 : -1 ] \
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__attribute__( ( unused ) );
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#endif
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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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#define MAX_CHANNELS 16
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#define MAX_BUCKETS 16
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#define MAX_HOTLIST_APS 128
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#define MAX_SIGNIFICANT_CHANGE_APS 64
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#define MAX_EPNO_NETWORKS 64
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#define MAX_HOTLIST_SSID 8
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#define MAX_AP_CACHE_PER_SCAN 32
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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
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int max_number_epno_networks_by_ssid; // max number of epno entries if ssid is specified,
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// that is, epno entries for which an exact match is
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// required, or entries corresponding to hidden ssids
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int max_number_of_white_listed_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_RESULTS_AVAILABLE, // reported when REPORT_EVENTS_EACH_SCAN is set and a scan
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// completes. WIFI_SCAN_THRESHOLD_NUM_SCANS or
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// WIFI_SCAN_THRESHOLD_PERCENT can be reported instead if the
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// reason for the event is available; however, at most one of
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// these events should be reported per scan. If there are
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// multiple buckets that were scanned this period and one has the
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// EACH_SCAN flag set then this event should be prefered.
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WIFI_SCAN_THRESHOLD_NUM_SCANS, // can be reported when REPORT_EVENTS_EACH_SCAN is not set and
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// report_threshold_num_scans is reached.
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WIFI_SCAN_THRESHOLD_PERCENT, // can be reported when REPORT_EVENTS_EACH_SCAN is not set and
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// report_threshold_percent is reached.
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WIFI_SCAN_FAILED, // reported when currently executing gscans have failed.
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// start_gscan will need to be called again in order to continue
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// scanning. This is intended to indicate abnormal scan
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// terminations (not those as a result of stop_gscan).
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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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static_assert(MAX_BUCKETS <= 8 * sizeof(unsigned),
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"The buckets_scanned bitset is represented by an unsigned int and cannot support this many "
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"buckets on this platform.");
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typedef struct {
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/* reported when each probe response is received, if report_events
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* enabled in wifi_scan_cmd_params. buckets_scanned is a bitset of the
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* buckets that are currently being scanned. See the buckets_scanned field
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* in the wifi_cached_scan_results struct for more details.
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*/
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void (*on_full_scan_result) (wifi_request_id id, wifi_scan_result *result,
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unsigned buckets_scanned);
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/* indicates progress of scanning statemachine */
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void (*on_scan_event) (wifi_request_id id, wifi_scan_event event);
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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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#define REPORT_EVENTS_EACH_SCAN (1 << 0)
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#define REPORT_EVENTS_FULL_RESULTS (1 << 1)
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#define REPORT_EVENTS_NO_BATCH (1 << 2)
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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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* This is a bit field; which defines following bits -
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* REPORT_EVENTS_EACH_SCAN => report a scan completion event after scan. If this is not set
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* then scan completion events should be reported if
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* report_threshold_percent or report_threshold_num_scans is
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* reached.
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* REPORT_EVENTS_FULL_RESULTS => forward scan results (beacons/probe responses + IEs)
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* in real time to HAL, in addition to completion events
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* Note: To keep backward compatibility, fire completion
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* events regardless of REPORT_EVENTS_EACH_SCAN.
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* REPORT_EVENTS_NO_BATCH => controls if scans for this bucket should be placed in the
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* history buffer
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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 * (base ^ (N/step_count))
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// to a maximum period of max_period
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int base; // for exponential back off bucket: multiplier: new_period=old_period*base
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int step_count; // for exponential back off bucket, number of scans to perform for a given
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// period
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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 access points to store in each scan entry in
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// the BSSID/RSSI history buffer (keep the highest RSSI
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// access points)
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int report_threshold_percent; // in %, when scan buffer is this much full, wake up apps
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// processor
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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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/*
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* Start periodic GSCAN
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* When this is called all requested buckets should be scanned, starting the beginning of the cycle
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*
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* For example:
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* If there are two buckets specified
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* - Bucket 1: period=10s
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* - Bucket 2: period=20s
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* - Bucket 3: period=30s
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* Then the following scans should occur
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* - t=0 buckets 1, 2, and 3 are scanned
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* - t=10 bucket 1 is scanned
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* - t=20 bucket 1 and 2 are scanned
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* - t=30 bucket 1 and 3 are scanned
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* - t=40 bucket 1 and 2 are scanned
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* - t=50 bucket 1 is scanned
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* - t=60 buckets 1, 2, and 3 are scanned
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* - and the patter repeats
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*
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* If any scan does not occur or is incomplete (error, interrupted, etc) then a cached scan result
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* should still be recorded with the WIFI_SCAN_FLAG_INTERRUPTED flag set.
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*/
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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
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// information about scan.
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unsigned buckets_scanned; // a bitset of the buckets that were scanned.
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// for example a value of 13 (0b1101) would
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// indicate that buckets 0, 2 and 3 were
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// scanned to produce this list of results.
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// should be set to 0 if this information is
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// not available.
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int num_results; // number of bssids retrieved by the scan
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wifi_scan_result results[MAX_AP_CACHE_PER_SCAN]; // 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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/* 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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// 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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// require firmware to store a large number of networks, covering the whole list of known networks.
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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) | flags>>3 (5 bits) | auth flags(3 bits)
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//
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// No scans should be automatically performed by the chip. Instead all scan results from gscan
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// should be scored and the wifi_epno_handler on_network_found callback should be called with
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// the scan results.
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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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//
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// A network should only be considered found if its RSSI is above the minimum RSSI for its
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// frequency range (min5GHz_rssi and min24GHz_rssi for 5GHz and 2.4GHz networks respectively).
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// When disconnected the list of scan results should be returned if any network is found.
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// When connected the scan results shall be reported only if the score of any network in the scan
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// is greater than that of the currently connected BSSID.
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//
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// The FW should calculate the score of all the candidates (including currently connected one)
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// with following equation:
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// RSSI score = (RSSI + 85) * 4;
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// If RSSI score > initial_score_max , RSSI score = initial_score_max;
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// final score = RSSI score
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// + current_connection_bonus (if currently connected BSSID)
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// + same_network_bonus (if network has SAME_NETWORK flag)
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// + secure_bonus (if the network is not open)
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// + band5GHz_bonus (if BSSID is on 5G)
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// If there is a BSSID’s score > current BSSID’s score, then report the cached scan results
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// at the end of the scan (excluding the ones on blacklist) to the upper layer.
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// Additionally, all BSSIDs that are in the BSSID blacklist should be ignored by Enhanced PNO
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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 << 0)
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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 (1 << 1)
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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 (1 << 2)
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// Whether strict matching is required
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// If required then the firmware must store the network's SSID and not just a hash
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#define WIFI_PNO_FLAG_STRICT_MATCH (1 << 3)
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// If this SSID should be considered the same network as the currently connected one for scoring
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#define WIFI_PNO_FLAG_SAME_NETWORK (1 << 4)
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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 << 0) // open
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#define WIFI_PNO_AUTH_CODE_PSK (1 << 1) // WPA_PSK or WPA2PSK
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#define WIFI_PNO_AUTH_CODE_EAPOL (1 << 2) // any EAPOL
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typedef struct {
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char ssid[32+1]; // null terminated
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byte flags; // WIFI_PNO_FLAG_XXX
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byte auth_bit_field; // auth bit field for matching WPA IE
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} wifi_epno_network;
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/* ePNO Parameters */
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typedef struct {
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int min5GHz_rssi; // minimum 5GHz RSSI for a BSSID to be considered
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int min24GHz_rssi; // minimum 2.4GHz RSSI for a BSSID to be considered
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int initial_score_max; // the maximum score that a network can have before bonuses
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int current_connection_bonus; // only report when there is a network's score this much higher
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// than the current connection.
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int same_network_bonus; // score bonus for all networks with the same network flag
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int secure_bonus; // score bonus for networks that are not open
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int band5GHz_bonus; // 5GHz RSSI score bonus (applied to all 5GHz networks)
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int num_networks; // number of wifi_epno_network objects
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wifi_epno_network networks[MAX_EPNO_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 ePNO list - enable ePNO with the given parameters */
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wifi_error wifi_set_epno_list(wifi_request_id id, wifi_interface_handle iface,
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const wifi_epno_params *epno_params, wifi_epno_handler handler);
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/* Reset the ePNO list - no ePNO networks should be matched after this */
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wifi_error wifi_reset_epno_list(wifi_request_id id, wifi_interface_handle iface);
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typedef struct {
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int id; // identifier of this network block, report this in event
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char realm[256]; // null terminated UTF8 encoded realm, 0 if unspecified
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int64_t roamingConsortiumIds[16]; // roaming consortium ids to match, 0s if unspecified
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byte plmn[3]; // mcc/mnc combination as per rules, 0s if unspecified
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} wifi_passpoint_network;
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typedef struct {
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void (*on_passpoint_network_found)(
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wifi_request_id id,
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int net_id, // network block identifier for the matched network
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wifi_scan_result *result, // scan result, with channel and beacon information
|
||
int anqp_len, // length of ANQP blob
|
||
byte *anqp // ANQP data, in the information_element format
|
||
);
|
||
} wifi_passpoint_event_handler;
|
||
|
||
/* Sets a list for passpoint networks for PNO purposes; it should be matched
|
||
* against any passpoint networks (designated by Interworking element) found
|
||
* during regular PNO scan. */
|
||
wifi_error wifi_set_passpoint_list(wifi_request_id id, wifi_interface_handle iface, int num,
|
||
wifi_passpoint_network *networks, wifi_passpoint_event_handler handler);
|
||
|
||
/* Reset passpoint network list - no Passpoint networks should be matched after this */
|
||
wifi_error wifi_reset_passpoint_list(wifi_request_id id, wifi_interface_handle iface);
|
||
|
||
#endif
|