When the regulatory settings change, some channels might become invalid.
Disconnect interfaces acting on these channels, after giving userspace
code a grace period to leave them.
Signed-off-by: Arik Nemtsov <arikx.nemtsov@xxxxxxxxx>
---
include/net/regulatory.h | 6 +++
net/wireless/reg.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 104 insertions(+), 1 deletion(-)
diff --git a/include/net/regulatory.h b/include/net/regulatory.h
index dad7ab2..701177c 100644
--- a/include/net/regulatory.h
+++ b/include/net/regulatory.h
@@ -136,6 +136,11 @@ struct regulatory_request {
* otherwise initiating radiation is not allowed. This will enable the
* relaxations enabled under the CFG80211_REG_RELAX_NO_IR configuration
* option
+ * @REGULATORY_ENFORCE_CHANNELS: the regulatory core will make sure all
+ * interfaces on this wiphy reside on allowed channels. Upon a regdomain
+ * change, the interfaces are given a grace period to disconnect or move
+ * to an allowed channels. Interfaces on forbidden channels are forcibly
+ * disconnected.
*/
enum ieee80211_regulatory_flags {
REGULATORY_CUSTOM_REG = BIT(0),
@@ -144,6 +149,7 @@ enum ieee80211_regulatory_flags {
REGULATORY_COUNTRY_IE_FOLLOW_POWER = BIT(3),
REGULATORY_COUNTRY_IE_IGNORE = BIT(4),
REGULATORY_ENABLE_RELAX_NO_IR = BIT(5),
+ REGULATORY_ENFORCE_CHANNELS = BIT(6),
};
struct ieee80211_freq_range {
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 7449a8c..efbdff0 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -56,6 +56,7 @@
#include <net/cfg80211.h>
#include "core.h"
#include "reg.h"
+#include "rdev-ops.h"
#include "regdb.h"
#include "nl80211.h"
@@ -66,6 +67,12 @@
#define REG_DBG_PRINT(args...)
#endif
+/*
+ * Grace period we give before making sure all current interfaces reside on
+ * channels allowed by the current regulatory domain.
+ */
+#define REG_ENFORCE_GRACE_MS 60000
+
/**
* enum reg_request_treatment - regulatory request treatment
*
@@ -210,6 +217,9 @@ struct reg_beacon {
struct ieee80211_channel chan;
};
+static void reg_check_chans_work(struct work_struct *work);
+static DECLARE_DELAYED_WORK(reg_check_chans, reg_check_chans_work);
+
static void reg_todo(struct work_struct *work);
static DECLARE_WORK(reg_work, reg_todo);
@@ -1518,6 +1528,88 @@ static void reg_call_notifier(struct wiphy *wiphy,
wiphy->reg_notifier(wiphy, request);
}
+static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev)
+{
+ struct ieee80211_channel *ch;
+ struct cfg80211_chan_def chandef;
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+ bool ret = true;
+
+ wdev_lock(wdev);
+
+ if (!wdev->netdev || !netif_running(wdev->netdev))
+ goto out;
+
+ switch (wdev->iftype) {
+ case NL80211_IFTYPE_AP:
+ case NL80211_IFTYPE_P2P_GO:
+ if (!wdev->beacon_interval)
+ goto out;
+
+ ret = cfg80211_reg_can_beacon(wiphy,
+ &wdev->chandef, wdev->iftype);
+ break;
+ case NL80211_IFTYPE_STATION:
+ case NL80211_IFTYPE_P2P_CLIENT:
+ if (!wdev->current_bss ||
+ !wdev->current_bss->pub.channel)
+ goto out;
+
+ ch = wdev->current_bss->pub.channel;
+ if (rdev->ops->get_channel &&
+ !rdev_get_channel(rdev, wdev, &chandef))
+ ret = cfg80211_chandef_usable(wiphy, &chandef,
+ IEEE80211_CHAN_DISABLED);
+ else
+ ret = !(ch->flags & IEEE80211_CHAN_DISABLED);
+ break;
+ default:
+ /* others not implemented for now */
+ break;
+ }
+
+out:
+ wdev_unlock(wdev);
+ return ret;
+}
+
+static void reg_leave_invalid_chans(struct wiphy *wiphy)
+{
+ struct wireless_dev *wdev;
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+
+ ASSERT_RTNL();
+
+ list_for_each_entry(wdev, &rdev->wdev_list, list)
+ if (!reg_wdev_chan_valid(wiphy, wdev))
+ cfg80211_leave(rdev, wdev);
+}
+
+static void reg_check_chans_work(struct work_struct *work)
+{
+ struct cfg80211_registered_device *rdev;
+
+ REG_DBG_PRINT("Verifying active interfaces after reg change\n");
+ rtnl_lock();
+
+ list_for_each_entry(rdev, &cfg80211_rdev_list, list)
+ if (rdev->wiphy.regulatory_flags & REGULATORY_ENFORCE_CHANNELS)
+ reg_leave_invalid_chans(&rdev->wiphy);
+
+ rtnl_unlock();
+}
+
+static void reg_check_channels(void)
+{
+ /*
+ * Give usermode a chance to do something nicer (move to another
+ * channel, orderly disconnection), before forcing a disconnection.
+ */
+ mod_delayed_work(system_power_efficient_wq,
+ ®_check_chans,
+ msecs_to_jiffies(REG_ENFORCE_GRACE_MS));
+}
+
static void wiphy_update_regulatory(struct wiphy *wiphy,
enum nl80211_reg_initiator initiator)
{
@@ -1557,6 +1649,8 @@ static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
wiphy = &rdev->wiphy;
wiphy_update_regulatory(wiphy, initiator);
}
+
+ reg_check_channels();
}
static void handle_channel_custom(struct wiphy *wiphy,
@@ -1963,8 +2057,10 @@ static void reg_process_hint(struct regulatory_request *reg_request)
/* This is required so that the orig_* parameters are saved */
if (treatment == REG_REQ_ALREADY_SET && wiphy &&
- wiphy->regulatory_flags & REGULATORY_STRICT_REG)
+ wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
wiphy_update_regulatory(wiphy, reg_request->initiator);
+ reg_check_channels();
+ }
return;
@@ -2845,6 +2941,7 @@ void regulatory_exit(void)
cancel_work_sync(®_work);
cancel_delayed_work_sync(®_timeout);
+ cancel_delayed_work_sync(®_check_chans);
/* Lock to suppress warnings */
rtnl_lock();
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
