4:31 a.m.
---
monitor/nlmon.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/monitor/nlmon.c b/monitor/nlmon.c
index 94d16979..4c0e045f 100644
--- a/monitor/nlmon.c
+++ b/monitor/nlmon.c
@@ -5578,6 +5578,10 @@ static const struct attr_entry attr_table[] = {
"FTM Responder" },
{ NL80211_ATTR_FTM_RESPONDER_STATS,
"FTM Responder Stats" },
+ { NL80211_ATTR_SCAN_START_TIME_TSF,
+ "Scan Start Time", ATTR_U64 },
+ { NL80211_ATTR_SCAN_START_TIME_TSF_BSSID,
+ "Scan Start Time BSSID", ATTR_ADDRESS },
{ }
};
--
2.17.1
4:31 a.m.
New subject: [PATCH v2 2/6] scan: fix parent TSF parsing
The value coming from the kernel is in the same endianness as IWD, so
just parse it as a u64 rather than le64.
---
src/scan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
-v2:
* Changed the commit description to match what was being changed. This
commit description somehow got duplicated from a previously upstreamed
commit adding parent TSF parsing
diff --git a/src/scan.c b/src/scan.c
index e74a69c1..e007ce5d 100644
--- a/src/scan.c
+++ b/src/scan.c
@@ -1076,7 +1076,7 @@ static struct scan_bss *scan_parse_attr_bss(struct l_genl_attr
*attr)
if (len != sizeof(uint64_t))
goto fail;
- bss->parent_tsf = l_get_le64(data);
+ bss->parent_tsf = l_get_u64(data);
break;
}
}
--
2.17.1
4:31 a.m.
New subject: [PATCH v2 3/6] rrm: include actual parent TSF value
If the scan results included a parent TSF value use it.
---
src/rrm.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/src/rrm.c b/src/rrm.c
index 73cf01f2..2b0a22fb 100644
--- a/src/rrm.c
+++ b/src/rrm.c
@@ -270,8 +270,13 @@ static size_t build_report_for_bss(struct rrm_beacon_req_info
*beacon,
to += 6;
/* Antenna identifier unknown */
*to++ = 0;
- /* Parent TSF - zero */
- memset(to, 0, 4);
+ /*
+ * 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;
/*
--
2.17.1
4:31 a.m.
New subject: [PATCH v2 4/6] scan: parse the scan start time
The kernel sends NL80211_ATTR_SCAN_START_TIME_TSF with CMD_TRIGGER and
RRM requires this value for beacon measurement reports. Since this
value is sent with CMD_TRIGGER we have to store it in the scan_context
and set it into the scan_bss when the scan finishes.
---
src/scan.c | 13 +++++++++++++
src/scan.h | 1 +
2 files changed, 14 insertions(+)
diff --git a/src/scan.c b/src/scan.c
index e007ce5d..52ed102c 100644
--- a/src/scan.c
+++ b/src/scan.c
@@ -91,6 +91,9 @@ struct scan_context {
unsigned int start_cmd_id;
/* Non-zero if GET_SCAN is still running */
unsigned int get_scan_cmd_id;
+
+ /* The time the current scan was started. Reported in TRIGGER_SCAN */
+ uint64_t start_time_tsf;
/*
* Whether the top request in the queue has triggered the current
* scan. May be set and cleared multiple times during a single
@@ -1312,6 +1315,7 @@ static void get_scan_callback(struct l_genl_msg *msg, void
*user_data)
}
bss->time_stamp = results->time_stamp;
+ bss->start_time_tsf = sc->start_time_tsf;
scan_bss_compute_rank(bss);
l_queue_insert(results->bss_list, bss, scan_bss_rank_compare, NULL);
@@ -1439,6 +1443,7 @@ static void scan_notify(struct l_genl_msg *msg, void *user_data)
uint32_t wiphy_id;
struct scan_context *sc;
bool active_scan = false;
+ uint64_t start_time_tsf = 0;
cmd = l_genl_msg_get_command(msg);
@@ -1461,6 +1466,12 @@ static void scan_notify(struct l_genl_msg *msg, void *user_data)
case NL80211_ATTR_SCAN_SSIDS:
active_scan = true;
break;
+ case NL80211_ATTR_SCAN_START_TIME_TSF:
+ if (len != sizeof(uint64_t))
+ return;
+
+ start_time_tsf = l_get_u64(data);
+ break;
}
}
@@ -1543,6 +1554,8 @@ static void scan_notify(struct l_genl_msg *msg, void *user_data)
else
sc->state = SCAN_STATE_PASSIVE;
+ sc->start_time_tsf = start_time_tsf;
+
break;
case NL80211_CMD_SCAN_ABORTED:
diff --git a/src/scan.h b/src/scan.h
index 8fc2aa56..fcbbe285 100644
--- a/src/scan.h
+++ b/src/scan.h
@@ -67,6 +67,7 @@ struct scan_bss {
uint8_t hessid[6];
uint8_t *rc_ie; /* Roaming consortium IE */
uint8_t hs20_version;
+ uint64_t start_time_tsf;
uint64_t parent_tsf;
bool mde_present : 1;
bool cc_present : 1;
--
2.17.1
1:21 p.m.
New subject: [PATCH v2 4/6] scan: parse the scan start time
Hi James,
On 11/20/19 11:31 AM, James Prestwood wrote:
The kernel sends NL80211_ATTR_SCAN_START_TIME_TSF with CMD_TRIGGER
and
RRM requires this value for beacon measurement reports. Since this
value is sent with CMD_TRIGGER we have to store it in the scan_context
and set it into the scan_bss when the scan finishes.
That seems rather expensive? To store an 8 byte value in all the bsses
that really belongs in the trigger callback? Perhaps we should just
pass it in as an additional argument.
Or since we have the scan_request id, perhaps it should be obtainable
using that? E.g. something like:
uint64_t scan_get_triggered_time(uint32_t id);
---
src/scan.c | 13 +++++++++++++
src/scan.h | 1 +
2 files changed, 14 insertions(+)
Regards,
-Denis
4:31 a.m.
New subject: [PATCH v2 5/6] rrm: include actual scan start time in report
---
src/rrm.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/src/rrm.c b/src/rrm.c
index 2b0a22fb..a231f7e9 100644
--- a/src/rrm.c
+++ b/src/rrm.c
@@ -249,8 +249,7 @@ static size_t build_report_for_bss(struct rrm_beacon_req_info
*beacon,
*to++ = beacon->oper_class;
*to++ = scan_freq_to_channel(bss->frequency, NULL);
- /* skip start time */
- memset(to, 0, 8);
+ l_put_le64(bss->start_time_tsf, to);
to += 8;
l_put_le16(beacon->duration, to);
to += 2;
--
2.17.1
4:31 a.m.
New subject: [PATCH v2 6/6] rrm: add packed struct for beacon reports
build_report_for_bss was refactored to use this packed structure rather
than l_put_* APIs.
---
src/rrm.c | 66 ++++++++++++++++++++++++++++++++++---------------------
1 file changed, 41 insertions(+), 25 deletions(-)
diff --git a/src/rrm.c b/src/rrm.c
index a231f7e9..adf55252 100644
--- a/src/rrm.c
+++ b/src/rrm.c
@@ -121,6 +121,21 @@ 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;
@@ -224,6 +239,17 @@ 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
*
@@ -245,38 +271,28 @@ static size_t build_report_for_bss(struct rrm_beacon_req_info
*beacon,
struct scan_bss *bss,
uint8_t *to)
{
- uint8_t *start = to;
-
- *to++ = beacon->oper_class;
- *to++ = scan_freq_to_channel(bss->frequency, NULL);
- l_put_le64(bss->start_time_tsf, 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;
+ struct rrm_beacon_report *report = (struct rrm_beacon_report *) to;
+
+ report->oper_class = beacon->oper_class;
+ report->channel = scan_freq_to_channel(bss->frequency, NULL);
+ report->scan_start_time = bss->start_time_tsf;
+ report->duration = 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;
- /* Antenna identifier unknown */
- *to++ = 0;
+ report->rsni = 255;
+ memcpy(report->bssid, bss->addr, 6);
+
+ 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 = (uint32_t)bss->parent_tsf;
/*
* TODO: Support optional subelements
@@ -284,7 +300,7 @@ 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,
--
2.17.1
1032
days inactive
1033
days old
7 comments
2 participants
participants (2)
-
Denis Kenzior -
James Prestwood