From: Vidyullatha Kanchanapally <vkanchan@xxxxxxxxxxxxxxxx>
Implement new functionality for aborting an ongoing scan.
Add NL80211_CMD_ABORT_SCAN to the nl80211 interface. After
aborting the scan, driver shall provide the scan status by
calling cfg80211_scan_done().
Reviewed-by: Jouni Malinen <jouni@xxxxxxxxxxxxxxxx>
Signed-off-by: Vidyullatha Kanchanapally <vkanchan@xxxxxxxxxxxxxxxx>
Signed-off-by: Sunil Dutt <usdutt@xxxxxxxxxxxxxxxx>
---
v2: Change return value of abort_scan to void
include/net/cfg80211.h | 4 ++++
include/uapi/linux/nl80211.h | 6 ++++++
net/wireless/nl80211.c | 26 ++++++++++++++++++++++++++
net/wireless/rdev-ops.h | 9 +++++++++
net/wireless/trace.h | 5 +++++
5 files changed, 50 insertions(+)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 48155be..6cb2e25 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2488,6 +2488,9 @@ struct cfg80211_qos_map {
* and returning to the base channel for communication with the AP.
* @tdls_cancel_channel_switch: Stop channel-switching with a TDLS peer. Both
* peers must be on the base channel when the call completes.
+ *
+ * @abort_scan: Tell the driver to abort an ongoing scan. The driver shall
+ * indicate the status of the scan through cfg80211_scan_done().
*/
struct cfg80211_ops {
int (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@@ -2752,6 +2755,7 @@ struct cfg80211_ops {
void (*tdls_cancel_channel_switch)(struct wiphy *wiphy,
struct net_device *dev,
const u8 *addr);
+ void (*abort_scan)(struct wiphy *wiphy, struct net_device *dev);
};
/*
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 1f0b4cf..7c8645f 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -820,6 +820,10 @@
* as an event to indicate changes for devices with wiphy-specific regdom
* management.
*
+ * @NL80211_CMD_ABORT_SCAN: Stop an ongoing scan. Returns -ENOENT if a scan is
+ * not running. The driver indicates the status of the scan through
+ * cfg80211_scan_done().
+ *
* @NL80211_CMD_MAX: highest used command number
* @__NL80211_CMD_AFTER_LAST: internal use
*/
@@ -1006,6 +1010,8 @@ enum nl80211_commands {
NL80211_CMD_WIPHY_REG_CHANGE,
+ NL80211_CMD_ABORT_SCAN,
+
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index d693c9d..6a7b4cf 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -10588,6 +10588,24 @@ static int nl80211_tdls_cancel_channel_switch(struct sk_buff *skb,
return 0;
}
+static int nl80211_abort_scan(struct sk_buff *skb, struct genl_info *info)
+{
+ struct cfg80211_registered_device *rdev = info->user_ptr[0];
+ struct net_device *dev = info->user_ptr[1];
+
+ if (!rdev->ops->abort_scan)
+ return -EOPNOTSUPP;
+
+ if (rdev->scan_msg)
+ return 0;
+
+ if (!rdev->scan_req)
+ return -ENOENT;
+
+ rdev_abort_scan(rdev, dev);
+ return 0;
+}
+
#define NL80211_FLAG_NEED_WIPHY 0x01
#define NL80211_FLAG_NEED_NETDEV 0x02
#define NL80211_FLAG_NEED_RTNL 0x04
@@ -11406,6 +11424,14 @@ static const struct genl_ops nl80211_ops[] = {
.internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
NL80211_FLAG_NEED_RTNL,
},
+ {
+ .cmd = NL80211_CMD_ABORT_SCAN,
+ .doit = nl80211_abort_scan,
+ .policy = nl80211_policy,
+ .flags = GENL_ADMIN_PERM,
+ .internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
+ NL80211_FLAG_NEED_RTNL,
+ },
};
/* notification functions */
diff --git a/net/wireless/rdev-ops.h b/net/wireless/rdev-ops.h
index c23516d..05edf43 100644
--- a/net/wireless/rdev-ops.h
+++ b/net/wireless/rdev-ops.h
@@ -1020,4 +1020,13 @@ rdev_tdls_cancel_channel_switch(struct cfg80211_registered_device *rdev,
trace_rdev_return_void(&rdev->wiphy);
}
+static inline void
+rdev_abort_scan(struct cfg80211_registered_device *rdev,
+ struct net_device *dev)
+{
+ trace_rdev_abort_scan(&rdev->wiphy, dev);
+ rdev->ops->abort_scan(&rdev->wiphy, dev);
+ trace_rdev_return_void(&rdev->wiphy);
+}
+
#endif /* __CFG80211_RDEV_OPS */
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index 0c392d3..ceb20eb 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -2818,6 +2818,11 @@ TRACE_EVENT(cfg80211_stop_iface,
WIPHY_PR_ARG, WDEV_PR_ARG)
);
+DEFINE_EVENT(wiphy_netdev_evt, rdev_abort_scan,
+ TP_PROTO(struct wiphy *wiphy, struct net_device *netdev),
+ TP_ARGS(wiphy, netdev)
+);
+
#endif /* !__RDEV_OPS_TRACE || TRACE_HEADER_MULTI_READ */
#undef TRACE_INCLUDE_PATH
--
1.8.2.1
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