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rrm: add packed struct for beacon reports 

build_report_for_bss was refactored to use this packed structure rather
than l_put_* APIs.
This commit is contained in:
James Prestwood 2019-11-21 13:36:31 -08:00 committed by Denis Kenzior
parent 37816f6ebf
commit 32dfb6208d
1 changed files with 39 additions and 23 deletions
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62
src/rrm.c
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@ -122,6 +122,21 @@ struct rrm_state {
uint64_t last_request;
};
/* 802.11, Section 9.4.2.22.7 */
struct rrm_beacon_report {
uint8_t oper_class;
uint8_t channel;
__le64 scan_start_time;
__le16 duration;
uint8_t frame_info;
uint8_t rcpi;
uint8_t rsni;
uint8_t bssid[6];
uint8_t antenna_id;
__le32 parent_tsf;
uint8_t subelements[0];
} __attribute__ ((packed));
static struct l_queue *states;
static struct l_genl_family *nl80211;
static uint32_t netdev_watch;
@ -225,6 +240,17 @@ static void rrm_build_measurement_report(struct rrm_request_info *info,
memcpy(to, report, report_len);
}
/* 802.11 Table 9-154 */
static uint8_t mdb_to_rcpi(int32_t mdb)
{
if (mdb <= 10950)
return 0;
else if (mdb >= -10950 && mdb < 0)
return (uint8_t)((2 * (mdb + 11000)) / 100);
else
return 220;
}
/*
* 802.11-2016 11.11.9.1 Beacon report
*
@ -246,38 +272,28 @@ static size_t build_report_for_bss(struct rrm_beacon_req_info *beacon,
struct scan_bss *bss,
uint8_t *to)
{
uint8_t *start = to;
struct rrm_beacon_report *report = (struct rrm_beacon_report *) to;
*to++ = beacon->oper_class;
*to++ = scan_freq_to_channel(bss->frequency, NULL);
l_put_le64(beacon->scan_start_time, to);
to += 8;
l_put_le16(beacon->duration, to);
to += 2;
*to++ = rrm_phy_type(bss);
/* 802.11 Table 9-154 - RCPI values */
if (bss->signal_strength < -10950)
*to++ = 0;
else if (bss->signal_strength >= -10950 && bss->signal_strength < 0)
*to++ = (uint8_t)((2 * (bss->signal_strength + 11000)) / 100);
else
*to++ = 220;
report->oper_class = beacon->oper_class;
report->channel = scan_freq_to_channel(bss->frequency, NULL);
report->scan_start_time = L_CPU_TO_LE64(beacon->scan_start_time);
report->duration = L_CPU_TO_LE16(beacon->duration);
report->frame_info = rrm_phy_type(bss);
report->rcpi = mdb_to_rcpi(bss->signal_strength);
/* RSNI not available (could get this from GET_SURVEY) */
*to++ = 255;
memcpy(to, bss->addr, 6);
to += 6;
report->rsni = 255;
memcpy(report->bssid, bss->addr, 6);
/* Antenna identifier unknown */
*to++ = 0;
report->antenna_id = 0;
/*
* 802.11 9.4.2.22.7 Beacon report
*
* "The Parent TSF field contains the lower 4 octets of the measuring
* STA's TSF timer value"
*/
l_put_le32((uint32_t)(bss->parent_tsf & 0xffffffff), to);
to += 4;
report->parent_tsf = L_CPU_TO_LE32((uint32_t) bss->parent_tsf);
/*
* TODO: Support optional subelements
@ -285,7 +301,7 @@ static size_t build_report_for_bss(struct rrm_beacon_req_info *beacon,
* (see "TODO: Support Reported Frame Body..." below)
*/
return to - start;
return sizeof(struct rrm_beacon_report);
}
static bool bss_in_request_range(struct rrm_beacon_req_info *beacon,