mac80211: allow drivers to access IPv6 information

To be able to implement NS response offloading (in
regular operation or while in WoWLAN) drivers need
to know the IPv6 addresses assigned to interfaces.
Implement an IPv6 notifier in mac80211 to call the
driver when addresses change.

Unlike for IPv4, implement it as a callback rather
than as a list in the BSS configuration, that is
more flexible.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 679ad4bb222b..ece5733d113d 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2497,6 +2497,9 @@ enum ieee80211_rate_control_changed {
  *      driver's resume function returned 1, as this is just like an "inline"
  *      hardware restart. This callback may sleep.
  *
+ * @ipv6_addr_change: IPv6 address assignment on the given interface changed.
+ *      Currently, this is only called for managed or P2P client interfaces.
+ *      This callback is optional; it must not sleep.
  */
 struct ieee80211_ops {
         void (*tx)(struct ieee80211_hw *hw,
@@ -2672,6 +2675,12 @@ struct ieee80211_ops {
                                      struct ieee80211_chanctx_conf *ctx);
 
         void (*restart_complete)(struct ieee80211_hw *hw);
+
+#if IS_ENABLED(CONFIG_IPV6)
+        void (*ipv6_addr_change)(struct ieee80211_hw *hw,
+                                 struct ieee80211_vif *vif,
+                                 struct inet6_dev *idev);
+#endif
 };
 
 /**