From: Avraham Stern <avraham.stern@xxxxxxxxx>
Add API to notify user-space when the device is in motion
and the motion type.
This information can be used to react to the changing environment when
the device is on the move, or avoid some unnecessary activities when
the device is not moving. For example, longer scan intervals when the
device is not moving and there are probably no new AP's, shorter scan
intervals while the device is moving slowly and the environment is
constantly changing, and not scanning at all when the device is moving
fast and it is very unlikely to be able to connect to anything.
Signed-off-by: Avraham Stern <avraham.stern@xxxxxxxxx>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
---
include/net/cfg80211.h | 14 ++++++++
include/uapi/linux/nl80211.h | 39 ++++++++++++++++++++++
net/wireless/core.h | 2 ++
net/wireless/nl80211.c | 78 ++++++++++++++++++++++++++++++++++++++++++++
net/wireless/trace.h | 14 ++++++++
5 files changed, 147 insertions(+)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index b960c4d..6210822 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -4914,6 +4914,20 @@ void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy);
/* ethtool helper */
void cfg80211_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info);
+/*
+ * cfg80211_device_motion_notify - notify device motion type
+ *
+ * @wiphy: the wiphy
+ * @type: the motion type as specified in &enum nl80211_device_motion_type.
+ * @gfp: allocation flags
+ *
+ * This function is used to report to userspace the type of motion the device
+ * is currently in.
+ */
+void cfg80211_device_motion_notify(struct wiphy *wiphy,
+ enum nl80211_device_motion_type type,
+ gfp_t gfp);
+
/* Logging, debugging and troubleshooting/diagnostic helpers. */
/* wiphy_printk helpers, similar to dev_printk */
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 8270024..fae01c7 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -733,6 +733,19 @@
* QoS mapping is relevant for IP packets, it is only valid during an
* association. This is cleared on disassociation and AP restart.
*
+ * @NL80211_CMD_DEVICE_MOTION_NOTIFY: Device motion notification. This command
+ * is used as an event to indicate the motion type the device is currently
+ * in. This command can also be used by userspace to get the current
+ * motion type. The motion type is specified by the
+ * %NL80211_ATTR_DEVICE_MOTION_TYPE. This information can be used to react
+ * to the changing environment when the device is on the move, or avoid
+ * some unnecessary activities when the device is not moving. For example,
+ * longer scan intervals when the device is not moving and neighbor AP's
+ * probably stay the same, shorter scan intervals while the device is
+ * moving slowly and the environment is changing constantly, and not
+ * scanning at all when the device is moving fast and it is very unlikely
+ * to be able to connect to anything.
+ *
* @NL80211_CMD_MAX: highest used command number
* @__NL80211_CMD_AFTER_LAST: internal use
*/
@@ -906,6 +919,8 @@ enum nl80211_commands {
NL80211_CMD_CH_SWITCH_STARTED_NOTIFY,
+ NL80211_CMD_DEVICE_MOTION_NOTIFY,
+
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
@@ -1620,6 +1635,9 @@ enum nl80211_commands {
* association request. In addition, it must also set the RRM capability
* flag in the association request's Capability Info field.
*
+ * @NL80211_ATTR_DEVICE_MOTION_TYPE: The type of motion the device is currently
+ * in. As specified in &enum nl80211_device_motion_type.
+ *
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
*/
@@ -1964,6 +1982,8 @@ enum nl80211_attrs {
NL80211_ATTR_USE_RRM,
+ NL80211_ATTR_DEVICE_MOTION_TYPE,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@@ -4223,4 +4243,23 @@ enum nl80211_tdls_peer_capability {
NL80211_TDLS_PEER_WMM = 1<<2,
};
+/**
+ * enum nl80211_device_motion_type - device motion types
+ * @NL80211_DEVICE_MOTION_TYPE_UNKNOWN: The device motion type is not known
+ * or has not been set yet.
+ * @NL80211_DEVICE_MOTION_TYPE_NOT_MOVING: The device is not moving. This
+ * includes cases in which the device is moving but its immediate
+ * environment is moving as well, e.g. while on board a train.
+ * @NL80211_DEVICE_MOTION_TYPE_MOVING_SLOWLY: The device is moving slowly enough
+ * to keep track of the changing environment.
+ * @NL80211_DEVICE_MOTION_TYPE_MOVING_FAST: The device is moving fast which
+ * makes it hard to keep track of the changing environment.
+ */
+enum nl80211_device_motion_type {
+ NL80211_DEVICE_MOTION_TYPE_UNKNOWN,
+ NL80211_DEVICE_MOTION_TYPE_NOT_MOVING,
+ NL80211_DEVICE_MOTION_TYPE_MOVING_SLOWLY,
+ NL80211_DEVICE_MOTION_TYPE_MOVING_FAST,
+};
+
#endif /* __LINUX_NL80211_H */
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 21d4b1d..a00be85 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -84,6 +84,8 @@ struct cfg80211_registered_device {
struct list_head destroy_list;
struct work_struct destroy_work;
+ enum nl80211_device_motion_type motion_type;
+
/* must be last because of the way we do wiphy_priv(),
* and it should at least be aligned to NETDEV_ALIGN */
struct wiphy wiphy __aligned(NETDEV_ALIGN);
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 03b5b5e..c7c014c 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -9451,6 +9451,48 @@ static int nl80211_set_qos_map(struct sk_buff *skb,
return ret;
}
+static int nl80211_send_motion(struct sk_buff *msg, u32 portid, u32 seq,
+ int flags,
+ struct cfg80211_registered_device *rdev)
+{
+ void *hdr;
+
+ hdr = nl80211hdr_put(msg, portid, seq, flags,
+ NL80211_CMD_DEVICE_MOTION_NOTIFY);
+ if (!hdr)
+ return -ENOBUFS;
+
+ if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||
+ nla_put_u32(msg, NL80211_ATTR_DEVICE_MOTION_TYPE,
+ rdev->motion_type))
+ goto nla_put_failure;
+
+ return genlmsg_end(msg, hdr);
+
+ nla_put_failure:
+ genlmsg_cancel(msg, hdr);
+ return -ENOBUFS;
+}
+
+static int nl80211_device_motion_notify(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ struct sk_buff *msg;
+ struct cfg80211_registered_device *rdev = info->user_ptr[0];
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ if (nl80211_send_motion(msg, genl_info_snd_portid(info), info->snd_seq,
+ 0, rdev) < 0) {
+ nlmsg_free(msg);
+ return -ENOBUFS;
+ }
+
+ return genlmsg_reply(msg, info);
+}
+
#define NL80211_FLAG_NEED_WIPHY 0x01
#define NL80211_FLAG_NEED_NETDEV 0x02
#define NL80211_FLAG_NEED_RTNL 0x04
@@ -10197,6 +10239,14 @@ static __genl_const struct genl_ops nl80211_ops[] = {
.internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
NL80211_FLAG_NEED_RTNL,
},
+ {
+ .cmd = NL80211_CMD_DEVICE_MOTION_NOTIFY,
+ .doit = nl80211_device_motion_notify,
+ .policy = nl80211_policy,
+ .flags = GENL_ADMIN_PERM,
+ .internal_flags = NL80211_FLAG_NEED_WIPHY |
+ NL80211_FLAG_NEED_RTNL,
+ },
};
/* notification functions */
@@ -12004,6 +12054,34 @@ void cfg80211_crit_proto_stopped(struct wireless_dev *wdev, gfp_t gfp)
}
EXPORT_SYMBOL(cfg80211_crit_proto_stopped);
+void cfg80211_device_motion_notify(struct wiphy *wiphy,
+ enum nl80211_device_motion_type type,
+ gfp_t gfp)
+{
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+ struct sk_buff *msg;
+
+ trace_cfg80211_device_motion_notify(wiphy, type);
+
+ if (rdev->motion_type == type)
+ return;
+
+ rdev->motion_type = type;
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
+ if (!msg)
+ return;
+
+ if (nl80211_send_motion(msg, 0, 0, 0, rdev) < 0) {
+ nlmsg_free(msg);
+ return;
+ }
+
+ genlmsg_multicast_netns(&nl80211_fam, wiphy_net(wiphy), msg, 0,
+ NL80211_MCGRP_SCAN, gfp);
+}
+EXPORT_SYMBOL(cfg80211_device_motion_notify);
+
void nl80211_send_ap_stopped(struct wireless_dev *wdev)
{
struct wiphy *wiphy = wdev->wiphy;
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index 0f0901e..e39a950 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -2627,6 +2627,20 @@ TRACE_EVENT(cfg80211_stop_iface,
WIPHY_PR_ARG, WDEV_PR_ARG)
);
+TRACE_EVENT(cfg80211_device_motion_notify,
+ TP_PROTO(struct wiphy *wiphy, enum nl80211_device_motion_type type),
+ TP_ARGS(wiphy, type),
+ TP_STRUCT__entry(
+ WIPHY_ENTRY
+ __field(enum nl80211_device_motion_type, type)
+ ),
+ TP_fast_assign(
+ WIPHY_ASSIGN;
+ __entry->type = type;
+ ),
+ TP_printk(WIPHY_PR_FMT ", type: %d", WIPHY_PR_ARG, __entry->type)
+);
+
#endif /* !__RDEV_OPS_TRACE || TRACE_HEADER_MULTI_READ */
#undef TRACE_INCLUDE_PATH
--
1.9.1
--
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