--- zzzz-none-000/linux-4.4.60/net/ipv6/ip6_output.c	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-1750e-727/linux-4.4.60/net/ipv6/ip6_output.c	2021-02-04 17:41:59.000000000 +0000
@@ -57,6 +57,10 @@
 #include <linux/mroute6.h>
 #include <net/l3mdev.h>
 
+#ifdef CONFIG_AVM_PA
+#include <avm/pa/avm_pa.h>
+#endif
+
 static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	struct dst_entry *dst = skb_dst(skb);
@@ -333,6 +337,9 @@
 				     struct sk_buff *skb)
 {
 	skb_sender_cpu_clear(skb);
+#ifdef CONFIG_AVM_PA
+	avm_pa_mark_routed(skb);
+#endif
 	return dst_output(net, sk, skb);
 }
 
@@ -552,6 +559,9 @@
 #ifdef CONFIG_NET_SCHED
 	to->tc_index = from->tc_index;
 #endif
+#ifdef CONFIG_AVM_PA
+	memcpy(AVM_PKT_INFO(to), AVM_PKT_INFO(from), sizeof(*AVM_PKT_INFO(to)));
+#endif
 	nf_copy(to, from);
 	skb_copy_secmark(to, from);
 }
@@ -1353,11 +1363,12 @@
 	 */
 
 	cork->length += length;
-	if (((length > mtu) ||
-	     (skb && skb_is_gso(skb))) &&
+	if ((skb && skb_is_gso(skb)) ||
+	    (((length + (skb ? skb->len : headersize)) > mtu) &&
+	    (skb_queue_len(queue) <= 1) &&
 	    (sk->sk_protocol == IPPROTO_UDP) &&
-	    (rt->dst.dev->features & NETIF_F_UFO) &&
-	    (sk->sk_type == SOCK_DGRAM) && !udp_get_no_check6_tx(sk)) {
+	    (rt->dst.dev->features & NETIF_F_UFO) && !dst_xfrm(&rt->dst) &&
+	    (sk->sk_type == SOCK_DGRAM) && !udp_get_no_check6_tx(sk))) {
 		err = ip6_ufo_append_data(sk, queue, getfrag, from, length,
 					  hh_len, fragheaderlen, exthdrlen,
 					  transhdrlen, mtu, flags, fl6);