Re: [PATCH wpan-next 5/5] mac802154: Avoid new associations while disassociating

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hello.

On 28.11.23 12:16, Miquel Raynal wrote:
While disassociating from a PAN ourselves, let's set the maximum number
of associations temporarily to zero to be sure no new device tries to
associate with us.

Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
  include/net/cfg802154.h |  4 +++-
  net/ieee802154/pan.c    |  8 +++++++-
  net/mac802154/cfg.c     | 11 ++++++++---
  3 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/include/net/cfg802154.h b/include/net/cfg802154.h
index a64bbcd71f10..cd95711b12b8 100644
--- a/include/net/cfg802154.h
+++ b/include/net/cfg802154.h
@@ -589,8 +589,10 @@ cfg802154_device_is_child(struct wpan_dev *wpan_dev,
   * cfg802154_set_max_associations - Limit the number of future associations
   * @wpan_dev: the wpan device
   * @max: the maximum number of devices we accept to associate
+ * @return: the old maximum value
   */
-void cfg802154_set_max_associations(struct wpan_dev *wpan_dev, unsigned int max);
+unsigned int cfg802154_set_max_associations(struct wpan_dev *wpan_dev,
+					    unsigned int max);
/**
   * cfg802154_get_free_short_addr - Get a free address among the known devices
diff --git a/net/ieee802154/pan.c b/net/ieee802154/pan.c
index fb5b0af2ef68..249df7364b3e 100644
--- a/net/ieee802154/pan.c
+++ b/net/ieee802154/pan.c
@@ -94,10 +94,16 @@ __le16 cfg802154_get_free_short_addr(struct wpan_dev *wpan_dev)
  }
  EXPORT_SYMBOL_GPL(cfg802154_get_free_short_addr);
-void cfg802154_set_max_associations(struct wpan_dev *wpan_dev, unsigned int max)
+unsigned int cfg802154_set_max_associations(struct wpan_dev *wpan_dev,
+					    unsigned int max)
  {
+	unsigned int old_max;
+
  	lockdep_assert_held(&wpan_dev->association_lock);
+ old_max = wpan_dev->max_associations;
  	wpan_dev->max_associations = max;
+
+	return old_max;
  }
  EXPORT_SYMBOL_GPL(cfg802154_set_max_associations);
diff --git a/net/mac802154/cfg.c b/net/mac802154/cfg.c
index 17e2032fac24..ef7f23af043f 100644
--- a/net/mac802154/cfg.c
+++ b/net/mac802154/cfg.c
@@ -389,6 +389,7 @@ static int mac802154_disassociate_from_parent(struct wpan_phy *wpan_phy,
  	struct ieee802154_local *local = wpan_phy_priv(wpan_phy);
  	struct ieee802154_pan_device *child, *tmp;
  	struct ieee802154_sub_if_data *sdata;
+	unsigned int max_assoc;
  	u64 eaddr;
  	int ret;
@@ -397,6 +398,7 @@ static int mac802154_disassociate_from_parent(struct wpan_phy *wpan_phy,
  	/* Start by disassociating all the children and preventing new ones to
  	 * attempt associations.
  	 */
+	max_assoc = cfg802154_set_max_associations(wpan_dev, 0);
  	list_for_each_entry_safe(child, tmp, &wpan_dev->children, node) {
  		ret = mac802154_send_disassociation_notif(sdata, child,
  							  IEEE802154_COORD_WISHES_DEVICE_TO_LEAVE);
@@ -429,14 +431,17 @@ static int mac802154_disassociate_from_parent(struct wpan_phy *wpan_phy,
  	if (local->hw.flags & IEEE802154_HW_AFILT) {
  		ret = drv_set_pan_id(local, wpan_dev->pan_id);
  		if (ret < 0)
-			return ret;
+			goto reset_mac_assoc;
ret = drv_set_short_addr(local, wpan_dev->short_addr);
  		if (ret < 0)
-			return ret;
+			goto reset_mac_assoc;
  	}
- return 0;
+reset_mac_assoc:
+	cfg802154_set_max_associations(wpan_dev, max_assoc);
+
+	return ret;
  }
static int mac802154_disassociate_child(struct wpan_phy *wpan_phy,

Acked-by: Stefan Schmidt <stefan@xxxxxxxxxxxxxxxxxx>

regards
Stefan Schmidt




[Index of Archives]     [Linux NFS]     [Linux NILFS]     [Linux USB Devel]     [Linux Audio Users]     [Photo]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux