--- zzzz-none-000/linux-4.4.271/include/linux/mroute6.h	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/include/linux/mroute6.h	2023-04-19 10:22:30.000000000 +0000
@@ -63,8 +63,8 @@
 
 struct mif_device {
 	struct net_device 	*dev;			/* Device we are using */
-	unsigned long	bytes_in,bytes_out;
-	unsigned long	pkt_in,pkt_out;		/* Statistics 			*/
+	unsigned long long   bytes_in,bytes_out;
+	unsigned long long   pkt_in,pkt_out;		/* Statistics 		*/
 	unsigned long	rate_limit;		/* Traffic shaping (NI) 	*/
 	unsigned char	threshold;		/* TTL threshold 		*/
 	unsigned short	flags;			/* Control flags 		*/
@@ -113,10 +113,51 @@
 
 #define MFC_ASSERT_THRESH (3*HZ)		/* Maximal freq. of asserts */
 
+#define IP6MR_MFC_EVENT_UPDATE   1
+#define IP6MR_MFC_EVENT_DELETE   2
+
 struct rtmsg;
 extern int ip6mr_get_route(struct net *net, struct sk_buff *skb,
 			   struct rtmsg *rtm, int nowait, u32 portid);
 
+/*
+ * Callback to registered modules in the event of updates to a multicast group
+ */
+typedef void (*ip6mr_mfc_event_offload_callback_t)(struct in6_addr *origin,
+						   struct in6_addr *group,
+						   u32 max_dest_dev,
+						   u32 dest_dev_idx[],
+						   uint8_t op);
+
+/*
+ * Register the callback used to inform offload modules when updates occur
+ * to MFC. The callback is registered by offload modules
+ */
+extern bool ip6mr_register_mfc_event_offload_callback(
+			ip6mr_mfc_event_offload_callback_t mfc_offload_cb);
+
+/*
+ * De-Register the callback used to inform offload modules when updates occur
+ * to MFC
+ */
+extern void ip6mr_unregister_mfc_event_offload_callback(void);
+
+/*
+ * Find the destination interface list given a multicast group and source
+ */
+extern int ip6mr_find_mfc_entry(struct net *net, struct in6_addr *origin,
+				struct in6_addr *group, u32 max_dst_cnt,
+				u32 dest_dev[]);
+
+/*
+ * Out-of-band multicast statistics update for flows that are offloaded from
+ * Linux
+ */
+extern int ip6mr_mfc_stats_update(struct net *net, struct in6_addr *origin,
+				  struct in6_addr *group, uint64_t pkts_in,
+				  uint64_t bytes_in, uint64_t pkts_out,
+				  uint64_t bytes_out);
+
 #ifdef CONFIG_IPV6_MROUTE
 extern struct sock *mroute6_socket(struct net *net, struct sk_buff *skb);
 extern int ip6mr_sk_done(struct sock *sk);