--- zzzz-none-000/linux-4.4.271/net/ipv6/ip6_gre.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/net/ipv6/ip6_gre.c	2023-04-19 10:22:30.000000000 +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");
@@ -370,7 +369,6 @@
 	dev_put(dev);
 }
 
-
 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 		       u8 type, u8 code, int offset, __be32 info)
 {
@@ -402,7 +400,7 @@
 	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;
 
@@ -486,11 +484,11 @@
 			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;
 		}
 	}
@@ -752,7 +750,7 @@
 
 		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) {
@@ -767,7 +765,7 @@
 	}
 
 	skb_set_inner_protocol(skb, protocol);
-
+	skb->skb_iif = dev->ifindex;
 	ip6tunnel_xmit(NULL, skb, dev);
 	return 0;
 tx_err_link_failure:
@@ -804,6 +802,8 @@
 	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 		fl6.flowi6_mark = skb->mark;
 
+	fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
+
 	err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
 	if (err != 0) {
 		/* XXX: send ICMP error even if DF is not set. */
@@ -848,12 +848,14 @@
 
 	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)
 		fl6.flowi6_mark = skb->mark;
 
+	fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
+
 	err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
 	if (err != 0) {
 		if (err == -EMSGSIZE)
@@ -1311,7 +1313,6 @@
 	tunnel->hlen		= sizeof(struct ipv6hdr) + 4;
 }
 
-
 static struct inet6_protocol ip6gre_protocol __read_mostly = {
 	.handler     = ip6gre_rcv,
 	.err_handler = ip6gre_err,
@@ -1368,7 +1369,6 @@
 	 */
 	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;
 
@@ -1445,7 +1445,6 @@
 	return ip6gre_tunnel_validate(tb, data);
 }
 
-
 static void ip6gre_netlink_parms(struct nlattr *data[],
 				struct __ip6_tnl_parm *parms)
 {
@@ -1522,7 +1521,7 @@
 
 	dev->netdev_ops = &ip6gre_tap_netdev_ops;
 	dev->destructor = ip6gre_dev_free;
-
+	dev->priv_flags_ext |= IFF_EXT_GRE_V6_TAP;
 	dev->features |= NETIF_F_NETNS_LOCAL;
 }