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scan: Add initial BSS rank computation

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This commit is contained in:
Denis Kenzior 2015-06-05 18:18:55 -05:00
parent 05c83349c6
commit 1b4a3f19f3
2 changed files with 55 additions and 0 deletions
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53
src/scan.c
View File

@ -28,6 +28,7 @@
#include <stdio.h>
#include <errno.h>
#include <sys/socket.h>
#include <limits.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <ell/ell.h>
@ -353,6 +354,55 @@ static struct scan_bss *scan_parse_result(struct l_genl_msg *msg,
return bss;
}
void scan_bss_compute_rank(struct scan_bss *bss)
{
double RANK_RSNE_FACTOR = 1.2;
double RANK_WPA_FACTOR = 1.0;
double RANK_OPEN_FACTOR = 0.5;
double RANK_NO_PRIVACY_FACTOR = 0.5;
double RANK_5G_FACTOR = 1.1;
double rank;
uint32_t irank;
/*
* Signal strength is in mBm (100 * dBm) and is negative.
* WiFi range is -0 to -100 dBm
*/
/* Heavily slanted towards signal strength */
rank = 10000 - bss->signal_strength;
/*
* Prefer RSNE first, WPA second. Open networks are much less
* desirable.
*/
if (bss->rsne)
rank *= RANK_RSNE_FACTOR;
else if (bss->wpa)
rank *= RANK_WPA_FACTOR;
else
rank *= RANK_OPEN_FACTOR;
/* We prefer networks with CAP PRIVACY */
if (!(bss->capability & IE_BSS_CAP_PRIVACY))
rank *= RANK_NO_PRIVACY_FACTOR;
/* Prefer 5G networks over 2.4G */
if (bss->frequency > 4000)
rank *= RANK_5G_FACTOR;
/* TODO: Take BSS Load into consideration */
/* TODO: Take maximum supported rate into consideration */
irank = rank;
if (irank > USHRT_MAX)
bss->rank = USHRT_MAX;
else
bss->rank = irank;
}
void scan_bss_free(struct scan_bss *bss)
{
l_free(bss->rsne);
@ -413,6 +463,9 @@ static void get_scan_callback(struct l_genl_msg *msg, void *user_data)
return;
}
scan_bss_compute_rank(bss);
l_debug("computed rank: %u", bss->rank);
l_queue_push_tail(results->bss_list, bss);
}

2
src/scan.h
View File

@ -40,6 +40,7 @@ struct scan_bss {
uint8_t *wpa;
uint8_t ssid[32];
uint8_t ssid_len;
uint16_t rank;
};
void scan_start(struct l_genl_family *nl80211, uint32_t ifindex,
@ -54,6 +55,7 @@ void scan_sched_start(struct l_genl_family *nl80211, uint32_t ifindex,
enum scan_ssid_security scan_get_ssid_security(enum ie_bss_capability bss_cap,
const struct ie_rsn_info *info);
void scan_bss_free(struct scan_bss *bss);
void scan_bss_compute_rank(struct scan_bss *bss);
void bss_get_supported_ciphers(struct scan_bss *bss,
uint16_t *pairwise_ciphers,