wifi: cfg80211: Add link_id parameter to various key operations for MLO

Add support for various key operations on MLD by adding new parameter
link_id. Pass the link_id received from userspace to driver for add_key,
get_key, del_key, set_default_key, set_default_mgmt_key and
set_default_beacon_key to support configuring keys specific to each MLO
link. Userspace must not specify link ID for MLO pairwise key since it
is common for all the MLO links.

Signed-off-by: Veerendranath Jakkam <quic_vjakkam@quicinc.com>
Link: https://lore.kernel.org/r/20220730052643.1959111-4-quic_vjakkam@quicinc.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 36 insertions, 15 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 1d393e09a632..ffbc65a9b00b 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3931,22 +3931,33 @@ struct mgmt_frame_regs {
  * @del_intf_link: Remove an MLO link from the given interface.
  *
  * @add_key: add a key with the given parameters. @mac_addr will be %NULL
- *	when adding a group key.
+ *	when adding a group key. @link_id will be -1 for non-MLO connection.
+ *	For MLO connection, @link_id will be >= 0 for group key and -1 for
+ *	pairwise key, @mac_addr will be peer's MLD address for MLO pairwise key.
  *
  * @get_key: get information about the key with the given parameters.
  *	@mac_addr will be %NULL when requesting information for a group
  *	key. All pointers given to the @callback function need not be valid
  *	after it returns. This function should return an error if it is
  *	not possible to retrieve the key, -ENOENT if it doesn't exist.
+ *	@link_id will be -1 for non-MLO connection. For MLO connection,
+ *	@link_id will be >= 0 for group key and -1 for pairwise key, @mac_addr
+ *	will be peer's MLD address for MLO pairwise key.
  *
  * @del_key: remove a key given the @mac_addr (%NULL for a group key)
- *	and @key_index, return -ENOENT if the key doesn't exist.
+ *	and @key_index, return -ENOENT if the key doesn't exist. @link_id will
+ *	be -1 for non-MLO connection. For MLO connection, @link_id will be >= 0
+ *	for group key and -1 for pairwise key, @mac_addr will be peer's MLD
+ *	address for MLO pairwise key.
  *
- * @set_default_key: set the default key on an interface
+ * @set_default_key: set the default key on an interface. @link_id will be >= 0
+ *	for MLO connection and -1 for non-MLO connection.
  *
- * @set_default_mgmt_key: set the default management frame key on an interface
+ * @set_default_mgmt_key: set the default management frame key on an interface.
+ *	@link_id will be >= 0 for MLO connection and -1 for non-MLO connection.
  *
- * @set_default_beacon_key: set the default Beacon frame key on an interface
+ * @set_default_beacon_key: set the default Beacon frame key on an interface.
+ *	@link_id will be >= 0 for MLO connection and -1 for non-MLO connection.
  *
  * @set_rekey_data: give the data necessary for GTK rekeying to the driver
  *
@@ -4295,22 +4306,24 @@ struct cfg80211_ops {
 				 unsigned int link_id);
 
 	int	(*add_key)(struct wiphy *wiphy, struct net_device *netdev,
-			   u8 key_index, bool pairwise, const u8 *mac_addr,
-			   struct key_params *params);
+			   int link_id, u8 key_index, bool pairwise,
+			   const u8 *mac_addr, struct key_params *params);
 	int	(*get_key)(struct wiphy *wiphy, struct net_device *netdev,
-			   u8 key_index, bool pairwise, const u8 *mac_addr,
-			   void *cookie,
+			   int link_id, u8 key_index, bool pairwise,
+			   const u8 *mac_addr, void *cookie,
 			   void (*callback)(void *cookie, struct key_params*));
 	int	(*del_key)(struct wiphy *wiphy, struct net_device *netdev,
-			   u8 key_index, bool pairwise, const u8 *mac_addr);
+			   int link_id, u8 key_index, bool pairwise,
+			   const u8 *mac_addr);
 	int	(*set_default_key)(struct wiphy *wiphy,
-				   struct net_device *netdev,
+				   struct net_device *netdev, int link_id,
 				   u8 key_index, bool unicast, bool multicast);
 	int	(*set_default_mgmt_key)(struct wiphy *wiphy,
-					struct net_device *netdev,
+					struct net_device *netdev, int link_id,
 					u8 key_index);
 	int	(*set_default_beacon_key)(struct wiphy *wiphy,
 					  struct net_device *netdev,
+					  int link_id,
 					  u8 key_index);
 
 	int	(*start_ap)(struct wiphy *wiphy, struct net_device *dev,
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index ffb7c573e299..573db20403dc 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -377,14 +377,22 @@
  *	the non-transmitting interfaces are deleted as well.
  *
  * @NL80211_CMD_GET_KEY: Get sequence counter information for a key specified
- *	by %NL80211_ATTR_KEY_IDX and/or %NL80211_ATTR_MAC.
+ *	by %NL80211_ATTR_KEY_IDX and/or %NL80211_ATTR_MAC. %NL80211_ATTR_MAC
+ *	represents peer's MLD address for MLO pairwise key. For MLO group key,
+ *	the link is identified by %NL80211_ATTR_MLO_LINK_ID.
  * @NL80211_CMD_SET_KEY: Set key attributes %NL80211_ATTR_KEY_DEFAULT,
  *	%NL80211_ATTR_KEY_DEFAULT_MGMT, or %NL80211_ATTR_KEY_THRESHOLD.
+ *	For MLO connection, the link to set default key is identified by
+ *	%NL80211_ATTR_MLO_LINK_ID.
  * @NL80211_CMD_NEW_KEY: add a key with given %NL80211_ATTR_KEY_DATA,
  *	%NL80211_ATTR_KEY_IDX, %NL80211_ATTR_MAC, %NL80211_ATTR_KEY_CIPHER,
- *	and %NL80211_ATTR_KEY_SEQ attributes.
+ *	and %NL80211_ATTR_KEY_SEQ attributes. %NL80211_ATTR_MAC represents
+ *	peer's MLD address for MLO pairwise key. The link to add MLO
+ *	group key is identified by %NL80211_ATTR_MLO_LINK_ID.
  * @NL80211_CMD_DEL_KEY: delete a key identified by %NL80211_ATTR_KEY_IDX
- *	or %NL80211_ATTR_MAC.
+ *	or %NL80211_ATTR_MAC. %NL80211_ATTR_MAC represents peer's MLD address
+ *	for MLO pairwise key. The link to delete group key is identified by
+ *	%NL80211_ATTR_MLO_LINK_ID.
  *
  * @NL80211_CMD_GET_BEACON: (not used)
  * @NL80211_CMD_SET_BEACON: change the beacon on an access point interface