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nl80211: allow BSS data to include CLOCK_BOOTTIME timestamp 

For location and connectivity services, userspace would often like
to know the time when the BSS was last seen. The current "last seen"
value is calculated in a way that makes it less useful, especially
if the system suspended in the meantime.

Add the ability for the driver to report a real CLOCK_BOOTTIME stamp
that can then be reported to userspace (if present).

Drivers wishing to use this must be converted to the new API to call
cfg80211_inform_bss_data() or cfg80211_inform_bss_frame_data(). They
need to ensure the reported value is accurate enough even when the
frame might have been buffered in the device (e.g. firmware.)

Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
[modified to use struct, inlines]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Dmitry Shmidt 2015-10-07 11:32:53 +02:00 committed by Johannes Berg
parent 93f0490e5d
commit 6e19bc4b70
7 changed files with 130 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
Documentation/DocBook/80211.tmpl
View File

@ -154,8 +154,9 @@
!Finclude/net/cfg80211.h cfg80211_scan_request
!Finclude/net/cfg80211.h cfg80211_scan_done
!Finclude/net/cfg80211.h cfg80211_bss
!Finclude/net/cfg80211.h cfg80211_inform_bss_width_frame
!Finclude/net/cfg80211.h cfg80211_inform_bss_width
!Finclude/net/cfg80211.h cfg80211_inform_bss
!Finclude/net/cfg80211.h cfg80211_inform_bss_frame_data
!Finclude/net/cfg80211.h cfg80211_inform_bss_data
!Finclude/net/cfg80211.h cfg80211_unlink_bss
!Finclude/net/cfg80211.h cfg80211_find_ie
!Finclude/net/cfg80211.h ieee80211_bss_get_ie

95
include/net/cfg80211.h
View File

@ -1575,6 +1575,26 @@ enum cfg80211_signal_type {
CFG80211_SIGNAL_TYPE_UNSPEC,
};
/**
* struct cfg80211_inform_bss - BSS inform data
* @chan: channel the frame was received on
* @scan_width: scan width that was used
* @signal: signal strength value, according to the wiphy's
* signal type
* @boottime_ns: timestamp (CLOCK_BOOTTIME) when the information was
* received; should match the time when the frame was actually
* received by the device (not just by the host, in case it was
* buffered on the device) and be accurate to about 10ms.
* If the frame isn't buffered, just passing the return value of
* ktime_get_boot_ns() is likely appropriate.
*/
struct cfg80211_inform_bss {
struct ieee80211_channel *chan;
enum nl80211_bss_scan_width scan_width;
s32 signal;
u64 boottime_ns;
};
/**
* struct cfg80211_bss_ie_data - BSS entry IE data
* @tsf: TSF contained in the frame that carried these IEs
@ -3958,14 +3978,11 @@ void cfg80211_sched_scan_stopped(struct wiphy *wiphy);
void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy);
/**
* cfg80211_inform_bss_width_frame - inform cfg80211 of a received BSS frame
*
* cfg80211_inform_bss_frame_data - inform cfg80211 of a received BSS frame
* @wiphy: the wiphy reporting the BSS
* @rx_channel: The channel the frame was received on
* @scan_width: width of the control channel
* @data: the BSS metadata
* @mgmt: the management frame (probe response or beacon)
* @len: length of the management frame
* @signal: the signal strength, type depends on the wiphy's signal_type
* @gfp: context flags
*
* This informs cfg80211 that BSS information was found and
@ -3975,11 +3992,26 @@ void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy);
* Or %NULL on error.
*/
struct cfg80211_bss * __must_check
cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
struct cfg80211_inform_bss *data,
struct ieee80211_mgmt *mgmt, size_t len,
gfp_t gfp);
static inline struct cfg80211_bss * __must_check
cfg80211_inform_bss_width_frame(struct wiphy *wiphy,
struct ieee80211_channel *rx_channel,
enum nl80211_bss_scan_width scan_width,
struct ieee80211_mgmt *mgmt, size_t len,
s32 signal, gfp_t gfp);
s32 signal, gfp_t gfp)
{
struct cfg80211_inform_bss data = {
.chan = rx_channel,
.scan_width = scan_width,
.signal = signal,
};
return cfg80211_inform_bss_frame_data(wiphy, &data, mgmt, len, gfp);
}
static inline struct cfg80211_bss * __must_check
cfg80211_inform_bss_frame(struct wiphy *wiphy,
@ -3987,9 +4019,13 @@ cfg80211_inform_bss_frame(struct wiphy *wiphy,
struct ieee80211_mgmt *mgmt, size_t len,
s32 signal, gfp_t gfp)
{
return cfg80211_inform_bss_width_frame(wiphy, rx_channel,
NL80211_BSS_CHAN_WIDTH_20,
mgmt, len, signal, gfp);
struct cfg80211_inform_bss data = {
.chan = rx_channel,
.scan_width = NL80211_BSS_CHAN_WIDTH_20,
.signal = signal,
};
return cfg80211_inform_bss_frame_data(wiphy, &data, mgmt, len, gfp);
}
/**
@ -4006,11 +4042,10 @@ enum cfg80211_bss_frame_type {
};
/**
* cfg80211_inform_bss_width - inform cfg80211 of a new BSS
* cfg80211_inform_bss_data - inform cfg80211 of a new BSS
*
* @wiphy: the wiphy reporting the BSS
* @rx_channel: The channel the frame was received on
* @scan_width: width of the control channel
* @data: the BSS metadata
* @ftype: frame type (if known)
* @bssid: the BSSID of the BSS
* @tsf: the TSF sent by the peer in the beacon/probe response (or 0)
@ -4018,7 +4053,6 @@ enum cfg80211_bss_frame_type {
* @beacon_interval: the beacon interval announced by the peer
* @ie: additional IEs sent by the peer
* @ielen: length of the additional IEs
* @signal: the signal strength, type depends on the wiphy's signal_type
* @gfp: context flags
*
* This informs cfg80211 that BSS information was found and
@ -4028,13 +4062,32 @@ enum cfg80211_bss_frame_type {
* Or %NULL on error.
*/
struct cfg80211_bss * __must_check
cfg80211_inform_bss_data(struct wiphy *wiphy,
struct cfg80211_inform_bss *data,
enum cfg80211_bss_frame_type ftype,
const u8 *bssid, u64 tsf, u16 capability,
u16 beacon_interval, const u8 *ie, size_t ielen,
gfp_t gfp);
static inline struct cfg80211_bss * __must_check
cfg80211_inform_bss_width(struct wiphy *wiphy,
struct ieee80211_channel *rx_channel,
enum nl80211_bss_scan_width scan_width,
enum cfg80211_bss_frame_type ftype,
const u8 *bssid, u64 tsf, u16 capability,
u16 beacon_interval, const u8 *ie, size_t ielen,
s32 signal, gfp_t gfp);
s32 signal, gfp_t gfp)
{
struct cfg80211_inform_bss data = {
.chan = rx_channel,
.scan_width = scan_width,
.signal = signal,
};
return cfg80211_inform_bss_data(wiphy, &data, ftype, bssid, tsf,
capability, beacon_interval, ie, ielen,
gfp);
}
static inline struct cfg80211_bss * __must_check
cfg80211_inform_bss(struct wiphy *wiphy,
@ -4044,11 +4097,15 @@ cfg80211_inform_bss(struct wiphy *wiphy,
u16 beacon_interval, const u8 *ie, size_t ielen,
s32 signal, gfp_t gfp)
{
return cfg80211_inform_bss_width(wiphy, rx_channel,
NL80211_BSS_CHAN_WIDTH_20, ftype,
bssid, tsf, capability,
beacon_interval, ie, ielen, signal,
gfp);
struct cfg80211_inform_bss data = {
.chan = rx_channel,
.scan_width = NL80211_BSS_CHAN_WIDTH_20,
.signal = signal,
};
return cfg80211_inform_bss_data(wiphy, &data, ftype, bssid, tsf,
capability, beacon_interval, ie, ielen,
gfp);
}
struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,

4
include/uapi/linux/nl80211.h
View File

@ -3364,6 +3364,9 @@ enum nl80211_bss_scan_width {
* (not present if no beacon frame has been received yet)
* @NL80211_BSS_PRESP_DATA: the data in @NL80211_BSS_INFORMATION_ELEMENTS and
* @NL80211_BSS_TSF is known to be from a probe response (flag attribute)
* @NL80211_BSS_LAST_SEEN_BOOTTIME: CLOCK_BOOTTIME timestamp when this entry
* was last updated by a received frame. The value is expected to be
* accurate to about 10ms. (u64, nanoseconds)
* @__NL80211_BSS_AFTER_LAST: internal
* @NL80211_BSS_MAX: highest BSS attribute
*/
@ -3383,6 +3386,7 @@ enum nl80211_bss {
NL80211_BSS_CHAN_WIDTH,
NL80211_BSS_BEACON_TSF,
NL80211_BSS_PRESP_DATA,
NL80211_BSS_LAST_SEEN_BOOTTIME,
/* keep last */
__NL80211_BSS_AFTER_LAST,

1
net/wireless/core.h
View File

@ -137,6 +137,7 @@ struct cfg80211_internal_bss {
struct list_head list;
struct list_head hidden_list;
struct rb_node rbn;
u64 ts_boottime;
unsigned long ts;
unsigned long refcount;
atomic_t hold;

5
net/wireless/nl80211.c
View File

@ -6605,6 +6605,11 @@ static int nl80211_send_bss(struct sk_buff *msg, struct netlink_callback *cb,
jiffies_to_msecs(jiffies - intbss->ts)))
goto nla_put_failure;
if (intbss->ts_boottime &&
nla_put_u64(msg, NL80211_BSS_LAST_SEEN_BOOTTIME,
intbss->ts_boottime))
goto nla_put_failure;
switch (rdev->wiphy.signal_type) {
case CFG80211_SIGNAL_TYPE_MBM:
if (nla_put_u32(msg, NL80211_BSS_SIGNAL_MBM, res->signal))

58
net/wireless/scan.c
View File

@ -839,6 +839,7 @@ cfg80211_bss_update(struct cfg80211_registered_device *rdev,
found->pub.signal = tmp->pub.signal;
found->pub.capability = tmp->pub.capability;
found->ts = tmp->ts;
found->ts_boottime = tmp->ts_boottime;
} else {
struct cfg80211_internal_bss *new;
struct cfg80211_internal_bss *hidden;
@ -938,14 +939,13 @@ cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
}
/* Returned bss is reference counted and must be cleaned up appropriately. */
struct cfg80211_bss*
cfg80211_inform_bss_width(struct wiphy *wiphy,
struct ieee80211_channel *rx_channel,
enum nl80211_bss_scan_width scan_width,
enum cfg80211_bss_frame_type ftype,
const u8 *bssid, u64 tsf, u16 capability,
u16 beacon_interval, const u8 *ie, size_t ielen,
s32 signal, gfp_t gfp)
struct cfg80211_bss *
cfg80211_inform_bss_data(struct wiphy *wiphy,
struct cfg80211_inform_bss *data,
enum cfg80211_bss_frame_type ftype,
const u8 *bssid, u64 tsf, u16 capability,
u16 beacon_interval, const u8 *ie, size_t ielen,
gfp_t gfp)
{
struct cfg80211_bss_ies *ies;
struct ieee80211_channel *channel;
@ -957,19 +957,21 @@ cfg80211_inform_bss_width(struct wiphy *wiphy,
return NULL;
if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
(signal < 0 || signal > 100)))
(data->signal < 0 || data->signal > 100)))
return NULL;
channel = cfg80211_get_bss_channel(wiphy, ie, ielen, rx_channel);
channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan);
if (!channel)
return NULL;
memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
tmp.pub.channel = channel;
tmp.pub.scan_width = scan_width;
tmp.pub.signal = signal;
tmp.pub.scan_width = data->scan_width;
tmp.pub.signal = data->signal;
tmp.pub.beacon_interval = beacon_interval;
tmp.pub.capability = capability;
tmp.ts_boottime = data->boottime_ns;
/*
* If we do not know here whether the IEs are from a Beacon or Probe
* Response frame, we need to pick one of the options and only use it
@ -999,7 +1001,7 @@ cfg80211_inform_bss_width(struct wiphy *wiphy,
}
rcu_assign_pointer(tmp.pub.ies, ies);
signal_valid = abs(rx_channel->center_freq - channel->center_freq) <=
signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
wiphy->max_adj_channel_rssi_comp;
res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
if (!res)
@ -1019,15 +1021,15 @@ cfg80211_inform_bss_width(struct wiphy *wiphy,
/* cfg80211_bss_update gives us a referenced result */
return &res->pub;
}
EXPORT_SYMBOL(cfg80211_inform_bss_width);
EXPORT_SYMBOL(cfg80211_inform_bss_data);
/* Returned bss is reference counted and must be cleaned up appropriately. */
/* cfg80211_inform_bss_width_frame helper */
struct cfg80211_bss *
cfg80211_inform_bss_width_frame(struct wiphy *wiphy,
struct ieee80211_channel *rx_channel,
enum nl80211_bss_scan_width scan_width,
struct ieee80211_mgmt *mgmt, size_t len,
s32 signal, gfp_t gfp)
cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
struct cfg80211_inform_bss *data,
struct ieee80211_mgmt *mgmt, size_t len,
gfp_t gfp)
{
struct cfg80211_internal_bss tmp = {}, *res;
struct cfg80211_bss_ies *ies;
@ -1040,8 +1042,7 @@ cfg80211_inform_bss_width_frame(struct wiphy *wiphy,
BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
offsetof(struct ieee80211_mgmt, u.beacon.variable));
trace_cfg80211_inform_bss_width_frame(wiphy, rx_channel, scan_width, mgmt,
len, signal);
trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
if (WARN_ON(!mgmt))
return NULL;
@ -1050,14 +1051,14 @@ cfg80211_inform_bss_width_frame(struct wiphy *wiphy,
return NULL;
if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
(signal < 0 || signal > 100)))
(data->signal < 0 || data->signal > 100)))
return NULL;
if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
return NULL;
channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
ielen, rx_channel);
ielen, data->chan);
if (!channel)
return NULL;
@ -1077,12 +1078,13 @@ cfg80211_inform_bss_width_frame(struct wiphy *wiphy,
memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
tmp.pub.channel = channel;
tmp.pub.scan_width = scan_width;
tmp.pub.signal = signal;
tmp.pub.scan_width = data->scan_width;
tmp.pub.signal = data->signal;
tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
tmp.ts_boottime = data->boottime_ns;
signal_valid = abs(rx_channel->center_freq - channel->center_freq) <=
signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
wiphy->max_adj_channel_rssi_comp;
res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
if (!res)
@ -1102,7 +1104,7 @@ cfg80211_inform_bss_width_frame(struct wiphy *wiphy,
/* cfg80211_bss_update gives us a referenced result */
return &res->pub;
}
EXPORT_SYMBOL(cfg80211_inform_bss_width_frame);
EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
{

22
net/wireless/trace.h
View File

@ -2670,30 +2670,30 @@ TRACE_EVENT(cfg80211_get_bss,
__entry->privacy)
);
TRACE_EVENT(cfg80211_inform_bss_width_frame,
TP_PROTO(struct wiphy *wiphy, struct ieee80211_channel *channel,
enum nl80211_bss_scan_width scan_width,
struct ieee80211_mgmt *mgmt, size_t len,
s32 signal),
TP_ARGS(wiphy, channel, scan_width, mgmt, len, signal),
TRACE_EVENT(cfg80211_inform_bss_frame,
TP_PROTO(struct wiphy *wiphy, struct cfg80211_inform_bss *data,
struct ieee80211_mgmt *mgmt, size_t len),
TP_ARGS(wiphy, data, mgmt, len),
TP_STRUCT__entry(
WIPHY_ENTRY
CHAN_ENTRY
__field(enum nl80211_bss_scan_width, scan_width)
__dynamic_array(u8, mgmt, len)
__field(s32, signal)
__field(u64, ts_boottime)
),
TP_fast_assign(
WIPHY_ASSIGN;
CHAN_ASSIGN(channel);
__entry->scan_width = scan_width;
CHAN_ASSIGN(data->chan);
__entry->scan_width = data->scan_width;
if (mgmt)
memcpy(__get_dynamic_array(mgmt), mgmt, len);
__entry->signal = signal;
__entry->signal = data->signal;
__entry->ts_boottime = data->boottime_ns;
),
TP_printk(WIPHY_PR_FMT ", " CHAN_PR_FMT "(scan_width: %d) signal: %d",
TP_printk(WIPHY_PR_FMT ", " CHAN_PR_FMT "(scan_width: %d) signal: %d, tsb:%llu",
WIPHY_PR_ARG, CHAN_PR_ARG, __entry->scan_width,
__entry->signal)
__entry->signal, (unsigned long long)__entry->ts_boottime)
);
DECLARE_EVENT_CLASS(cfg80211_bss_evt,