From: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
This new nl80211 command allow a user space application to
instruct the WiFi stack to let all the beacons through so
that measurements can be conducted on these beacons (i.e.
RSSI etc...)
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
include/net/cfg80211.h | 12 ++++++++++++
include/uapi/linux/nl80211.h | 10 ++++++++++
net/wireless/nl80211.c | 32 +++++++++++++++++++++++++++++++-
net/wireless/rdev-ops.h | 13 +++++++++++++
net/wireless/trace.h | 17 +++++++++++++++++
5 files changed, 83 insertions(+), 1 deletion(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index aeaf6df..019e256 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2139,6 +2139,10 @@ struct cfg80211_update_ft_ies_params {
* @crit_proto_stop: Indicates critical protocol no longer needs increased link
* reliability. This operation can not fail.
* @set_coalesce: Set coalesce parameters.
+ *
+ * @beacon_measurement: Start / stops the beacon measurement. When enabled,
+ * beacons should be let through cfg80211 to proceed to measurements (e.g.
+ * RSSI analysis).
*/
struct cfg80211_ops {
int (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@@ -2376,6 +2380,10 @@ struct cfg80211_ops {
struct wireless_dev *wdev);
int (*set_coalesce)(struct wiphy *wiphy,
struct cfg80211_coalesce *coalesce);
+
+ int (*beacon_measurement)(struct wiphy *wiphy,
+ struct wireless_dev *wdev,
+ bool state);
};
/*
@@ -2441,6 +2449,9 @@ struct cfg80211_ops {
* @WIPHY_FLAG_OFFCHAN_TX: Device supports direct off-channel TX.
* @WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL: Device supports remain-on-channel call.
* @WIPHY_FLAG_SUPPORTS_5_10_MHZ: Device supports 5 MHz and 10 MHz channels.
+ * @WIPHY_FLAG_SUPPORTS_BEACON_MEAS: Device supports beacon measurements. Should
+ * be set when the device can let all the beacon through up to cfg80211
+ * to proceed to measurements (i.e. RSSI measurements).
*/
enum wiphy_flags {
WIPHY_FLAG_CUSTOM_REGULATORY = BIT(0),
@@ -2465,6 +2476,7 @@ enum wiphy_flags {
WIPHY_FLAG_OFFCHAN_TX = BIT(20),
WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL = BIT(21),
WIPHY_FLAG_SUPPORTS_5_10_MHZ = BIT(22),
+ WIPHY_FLAG_SUPPORTS_BEACON_MEAS = BIT(23),
};
/**
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index eb68735..1a5edad 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -676,6 +676,9 @@
* @NL80211_CMD_GET_COALESCE: Get currently supported coalesce rules.
* @NL80211_CMD_SET_COALESCE: Configure coalesce rules or clear existing rules.
*
+ * @NL80211_CMD_BEACON_MEASUREMENT: Indicates the beacon measurement is
+ * started / stopped. Disassociation should stop the measurements.
+ *
* @NL80211_CMD_MAX: highest used command number
* @__NL80211_CMD_AFTER_LAST: internal use
*/
@@ -841,6 +844,8 @@ enum nl80211_commands {
NL80211_CMD_GET_COALESCE,
NL80211_CMD_SET_COALESCE,
+ NL80211_CMD_BEACON_MEASUREMENT,
+
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
@@ -1469,6 +1474,9 @@ enum nl80211_commands {
*
* @NL80211_ATTR_COALESCE_RULE: Coalesce rule information.
*
+ * @NL80211_ATTR_BCON_MEAS_STATE: The state of the beacon measurements. This is
+ * a flag attribute.
+ *
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
*/
@@ -1771,6 +1779,8 @@ enum nl80211_attrs {
NL80211_ATTR_COALESCE_RULE,
+ NL80211_ATTR_BCON_MEAS_STATE,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 03d4ef9..c2b43b6 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -349,6 +349,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
[NL80211_ATTR_IE_RIC] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_DATA_LEN },
[NL80211_ATTR_PEER_AID] = { .type = NLA_U16 },
+ [NL80211_ATTR_BCON_MEAS_STATE] = { .type = NLA_FLAG, },
};
/* policy for the key attributes */
@@ -8646,6 +8647,27 @@ static int nl80211_crit_protocol_stop(struct sk_buff *skb,
return 0;
}
+static int nl80211_beacon_measurement(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ struct cfg80211_registered_device *rdev = info->user_ptr[0];
+ struct wireless_dev *wdev = info->user_ptr[1];
+ bool state;
+
+
+ if (!rdev->ops->beacon_measurement ||
+ !(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_BEACON_MEAS))
+ return -EOPNOTSUPP;
+
+ /* Relevant for associated mgd interfaces only */
+ if (wdev->iftype != NL80211_IFTYPE_STATION || !wdev->current_bss)
+ return -EOPNOTSUPP;
+
+ state = info->attrs[NL80211_ATTR_BCON_MEAS_STATE];
+
+ return rdev_beacon_measurement(rdev, wdev, state);
+}
+
#define NL80211_FLAG_NEED_WIPHY 0x01
#define NL80211_FLAG_NEED_NETDEV 0x02
#define NL80211_FLAG_NEED_RTNL 0x04
@@ -9361,7 +9383,15 @@ static struct genl_ops nl80211_ops[] = {
.flags = GENL_ADMIN_PERM,
.internal_flags = NL80211_FLAG_NEED_WIPHY |
NL80211_FLAG_NEED_RTNL,
- }
+ },
+ {
+ .cmd = NL80211_CMD_BEACON_MEASUREMENT,
+ .doit = nl80211_beacon_measurement,
+ .policy = nl80211_policy,
+ .flags = GENL_ADMIN_PERM,
+ .internal_flags = NL80211_FLAG_NEED_WDEV_UP |
+ NL80211_FLAG_NEED_RTNL,
+ },
};
static struct genl_multicast_group nl80211_mlme_mcgrp = {
diff --git a/net/wireless/rdev-ops.h b/net/wireless/rdev-ops.h
index 9f15f0a..e5b0efb 100644
--- a/net/wireless/rdev-ops.h
+++ b/net/wireless/rdev-ops.h
@@ -923,4 +923,17 @@ static inline void rdev_crit_proto_stop(struct cfg80211_registered_device *rdev,
trace_rdev_return_void(&rdev->wiphy);
}
+static inline int
+rdev_beacon_measurement(struct cfg80211_registered_device *rdev,
+ struct wireless_dev *wdev, bool state)
+{
+ int ret;
+
+ trace_rdev_beacon_measurement(&rdev->wiphy, wdev, state);
+ ret = rdev->ops->beacon_measurement(&rdev->wiphy, wdev, state);
+ trace_rdev_return_int(&rdev->wiphy, ret);
+
+ return ret;
+}
+
#endif /* __CFG80211_RDEV_OPS */
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index 09af6eb..5f6e7f0 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -1841,6 +1841,23 @@ TRACE_EVENT(rdev_crit_proto_stop,
WIPHY_PR_ARG, WDEV_PR_ARG)
);
+TRACE_EVENT(rdev_beacon_measurement,
+ TP_PROTO(struct wiphy *wiphy, struct wireless_dev *wdev, bool state),
+ TP_ARGS(wiphy, wdev, state),
+ TP_STRUCT__entry(
+ WIPHY_ENTRY
+ WDEV_ENTRY
+ __field(bool, state)
+ ),
+ TP_fast_assign(
+ WIPHY_ASSIGN;
+ WDEV_ASSIGN;
+ __entry->state = state;
+ ),
+ TP_printk(WIPHY_PR_FMT ", " WDEV_PR_FMT " %s",
+ WIPHY_PR_ARG, WDEV_PR_ARG, BOOL_TO_STR(__entry->state))
+);
+
/*************************************************************
* cfg80211 exported functions traces *
*************************************************************/
--
1.8.0
--
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