--- zzzz-none-000/linux-4.4.60/net/ipv6/ip6_gre.c	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/net/ipv6/ip6_gre.c	2021-02-04 17:41:59.000000000 +0000
@@ -57,7 +57,6 @@
 #include <net/ip6_tunnel.h>
 #include <net/gre.h>
 
-
 static bool log_ecn_error = true;
 module_param(log_ecn_error, bool, 0644);
 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
@@ -366,7 +365,6 @@
 	dev_put(dev);
 }
 
-
 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 		       u8 type, u8 code, int offset, __be32 info)
 {
@@ -398,7 +396,7 @@
 	key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
 
 	t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
-				 key, greh->protocol);
+				key, greh->protocol);
 	if (!t)
 		return;
 
@@ -479,11 +477,11 @@
 			offset += 4;
 		}
 		if (flags&GRE_KEY) {
-			key = *(__be32 *)(h + offset);
+			key = net_hdr_word(h + offset);
 			offset += 4;
 		}
 		if (flags&GRE_SEQ) {
-			seqno = ntohl(*(__be32 *)(h + offset));
+			seqno = ntohl(net_hdr_word(h + offset));
 			offset += 4;
 		}
 	}
@@ -745,7 +743,7 @@
 
 		if (tunnel->parms.o_flags&GRE_SEQ) {
 			++tunnel->o_seqno;
-			*ptr = htonl(tunnel->o_seqno);
+			net_hdr_word(ptr) = htonl(tunnel->o_seqno);
 			ptr--;
 		}
 		if (tunnel->parms.o_flags&GRE_KEY) {
@@ -760,7 +758,7 @@
 	}
 
 	skb_set_inner_protocol(skb, protocol);
-
+	skb->skb_iif = dev->ifindex;
 	ip6tunnel_xmit(NULL, skb, dev);
 	return 0;
 tx_err_link_failure:
@@ -841,7 +839,7 @@
 
 	dsfield = ipv6_get_dsfield(ipv6h);
 	if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
-		fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
+		fl6.flowlabel |= net_hdr_word(ipv6h) & IPV6_TCLASS_MASK;
 	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
 		fl6.flowlabel |= ip6_flowlabel(ipv6h);
 	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
@@ -1305,7 +1303,6 @@
 	dev_hold(dev);
 }
 
-
 static struct inet6_protocol ip6gre_protocol __read_mostly = {
 	.handler     = ip6gre_rcv,
 	.err_handler = ip6gre_err,
@@ -1361,7 +1358,6 @@
 	 */
 	ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
 
-
 	ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
 	ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
 
@@ -1438,7 +1434,6 @@
 	return ip6gre_tunnel_validate(tb, data);
 }
 
-
 static void ip6gre_netlink_parms(struct nlattr *data[],
 				struct __ip6_tnl_parm *parms)
 {
@@ -1515,7 +1510,7 @@
 
 	dev->netdev_ops = &ip6gre_tap_netdev_ops;
 	dev->destructor = ip6gre_dev_free;
-
+	dev->priv_flags |= IFF_GRE_V6_TAP;
 	dev->features |= NETIF_F_NETNS_LOCAL;
 }