368 	int mtu = ETH_DATA_LEN;  in ip_tunnel_bind_dev()  local
397 		mtu = tdev->mtu;  in ip_tunnel_bind_dev()
401 	mtu -= (dev->hard_header_len + t_hlen);  in ip_tunnel_bind_dev()
403 	if (mtu < 68)  in ip_tunnel_bind_dev()
404 		mtu = 68;  in ip_tunnel_bind_dev()
406 	return mtu;  in ip_tunnel_bind_dev()
421 	dev->mtu = ip_tunnel_bind_dev(dev);  in ip_tunnel_create()
605 	int mtu;  in tnl_update_pmtu()  local
608 		mtu = dst_mtu(&rt->dst) - dev->hard_header_len  in tnl_update_pmtu()
611 		mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;  in tnl_update_pmtu()
614 		skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);  in tnl_update_pmtu()
619 		    mtu < pkt_size) {  in tnl_update_pmtu()
621 			icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));  in tnl_update_pmtu()
629 		if (rt6 && mtu < dst_mtu(skb_dst(skb)) &&  in tnl_update_pmtu()
630 			   mtu >= IPV6_MIN_MTU) {  in tnl_update_pmtu()
635 				dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);  in tnl_update_pmtu()
639 		if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU &&  in tnl_update_pmtu()
640 					mtu < pkt_size) {  in tnl_update_pmtu()
641 			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);  in tnl_update_pmtu()
837 		int mtu;  in ip_tunnel_update()  local
840 		mtu = ip_tunnel_bind_dev(dev);  in ip_tunnel_update()
842 			dev->mtu = mtu;  in ip_tunnel_update()
967 	dev->mtu = new_mtu;  in __ip_tunnel_change_mtu()
1044 		itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev);  in ip_tunnel_init_net()
1095 	int mtu;  in ip_tunnel_newlink()  local
1118 	mtu = ip_tunnel_bind_dev(dev);  in ip_tunnel_newlink()
1120 		dev->mtu = mtu;  in ip_tunnel_newlink()