target/linux/mediatek/patches-5.4/1002-mtkhnat-add-support-for-virtual-interface-acceleration.patch

diff --git a/include/net/netfilter/nf_flow_table.h b/include/net/netfilter/nf_flow_table.h
index 3d73c0c..960ade1 100644
--- a/include/net/netfilter/nf_flow_table.h
+++ b/include/net/netfilter/nf_flow_table.h
@@ -92,9 +92,12 @@ struct flow_offload {
 #define FLOW_OFFLOAD_PATH_VLAN		BIT(1)
 #define FLOW_OFFLOAD_PATH_PPPOE		BIT(2)
 #define FLOW_OFFLOAD_PATH_DSA		BIT(3)
+#define FLOW_OFFLOAD_PATH_DSLITE	BIT(4)
+#define FLOW_OFFLOAD_PATH_6RD		BIT(5)
 
 struct flow_offload_hw_path {
 	struct net_device *dev;
+	struct net_device *virt_dev;
 	u32 flags;
 
 	u8 eth_src[ETH_ALEN];
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index be6801524..c51af70f6 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -761,6 +761,7 @@ static int vlan_dev_flow_offload_check(struct flow_offload_hw_path *path)
 	path->flags |= FLOW_OFFLOAD_PATH_VLAN;
 	path->vlan_proto = vlan->vlan_proto;
 	path->vlan_id = vlan->vlan_id;
+	path->virt_dev = dev;
 	path->dev = vlan->real_dev;
 
 	if (vlan->real_dev->netdev_ops->ndo_flow_offload_check)
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 1b7e3141c..da4e34f74 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -57,6 +57,11 @@
 #include <net/netns/generic.h>
 #include <net/dst_metadata.h>
 
+#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
+#include <linux/netfilter.h>
+#include <net/netfilter/nf_flow_table.h>
+#endif
+
 MODULE_AUTHOR("Ville Nuorvala");
 MODULE_DESCRIPTION("IPv6 tunneling device");
 MODULE_LICENSE("GPL");
@@ -1880,6 +1885,22 @@ int ip6_tnl_get_iflink(const struct net_device *dev)
 }
 EXPORT_SYMBOL(ip6_tnl_get_iflink);
 
+#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
+static int ipip6_dev_flow_offload_check(struct flow_offload_hw_path *path)
+{
+	struct net_device *dev = path->dev;
+	struct ip6_tnl *tnl = netdev_priv(dev);
+
+	if (path->flags & FLOW_OFFLOAD_PATH_DSLITE)
+		return -EEXIST;
+
+	path->flags |= FLOW_OFFLOAD_PATH_DSLITE;
+	path->dev = tnl->dev;
+
+	return 0;
+}
+#endif /* CONFIG_NF_FLOW_TABLE */
+
 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
 			  unsigned int num)
 {
@@ -1941,6 +1962,9 @@ static const struct net_device_ops ip6_tnl_netdev_ops = {
 	.ndo_change_mtu = ip6_tnl_change_mtu,
 	.ndo_get_stats	= ip6_get_stats,
 	.ndo_get_iflink = ip6_tnl_get_iflink,
+#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
+	.ndo_flow_offload_check = ipip6_dev_flow_offload_check,
+#endif
 };
 
 #define IPXIPX_FEATURES (NETIF_F_SG |		\
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 98954830c..42b6e8c4c 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -52,6 +52,11 @@
 #include <net/net_namespace.h>
 #include <net/netns/generic.h>
 
+#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
+#include <linux/netfilter.h>
+#include <net/netfilter/nf_flow_table.h>
+#endif
+
 /*
    This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
 
@@ -1345,6 +1350,22 @@ ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 	return err;
 }
 
+#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
+static int ipip6_dev_flow_offload_check(struct flow_offload_hw_path *path)
+{
+	struct net_device *dev = path->dev;
+	struct ip_tunnel *tnl = netdev_priv(dev);
+
+	if (path->flags & FLOW_OFFLOAD_PATH_6RD)
+		return -EEXIST;
+
+	path->flags |= FLOW_OFFLOAD_PATH_6RD;
+	path->dev = tnl->dev;
+
+	return 0;
+}
+#endif /* CONFIG_NF_FLOW_TABLE */
+
 static const struct net_device_ops ipip6_netdev_ops = {
 	.ndo_init	= ipip6_tunnel_init,
 	.ndo_uninit	= ipip6_tunnel_uninit,
@@ -1352,6 +1373,9 @@ static const struct net_device_ops ipip6_netdev_ops = {
 	.ndo_do_ioctl	= ipip6_tunnel_ioctl,
 	.ndo_get_stats64 = ip_tunnel_get_stats64,
 	.ndo_get_iflink = ip_tunnel_get_iflink,
+#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
+	.ndo_flow_offload_check = ipip6_dev_flow_offload_check,
+#endif
 };
 
 static void ipip6_dev_free(struct net_device *dev)