285 	int mtu = ETH_DATA_LEN;  in ip_tunnel_bind_dev()  local
316 		mtu = min(tdev->mtu, IP_MAX_MTU);  in ip_tunnel_bind_dev()
320 	mtu -= t_hlen + (dev->type == ARPHRD_ETHER ? dev->hard_header_len : 0);  in ip_tunnel_bind_dev()
322 	if (mtu < IPV4_MIN_MTU)  in ip_tunnel_bind_dev()
323 		mtu = IPV4_MIN_MTU;  in ip_tunnel_bind_dev()
325 	return mtu;  in ip_tunnel_bind_dev()
335 	int mtu;  in ip_tunnel_create()  local
342 	mtu = ip_tunnel_bind_dev(dev);  in ip_tunnel_create()
343 	err = dev_set_mtu(dev, mtu);  in ip_tunnel_create()
491 	int mtu;  in tnl_update_pmtu()  local
498 		mtu = dst_mtu(&rt->dst) - (sizeof(struct iphdr) + tunnel_hlen);  in tnl_update_pmtu()
499 		mtu -= dev->type == ARPHRD_ETHER ? dev->hard_header_len : 0;  in tnl_update_pmtu()
501 		mtu = skb_valid_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;  in tnl_update_pmtu()
505 		skb_dst_update_pmtu_no_confirm(skb, mtu);  in tnl_update_pmtu()
510 		    mtu < pkt_size) {  in tnl_update_pmtu()
511 			icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));  in tnl_update_pmtu()
524 		if (rt6 && mtu < dst_mtu(skb_dst(skb)) &&  in tnl_update_pmtu()
525 			   mtu >= IPV6_MIN_MTU) {  in tnl_update_pmtu()
529 				dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);  in tnl_update_pmtu()
533 		if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU &&  in tnl_update_pmtu()
534 					mtu < pkt_size) {  in tnl_update_pmtu()
535 			icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);  in tnl_update_pmtu()
847 		int mtu;  in ip_tunnel_update()  local
851 		mtu = ip_tunnel_bind_dev(dev);  in ip_tunnel_update()
853 			dev->mtu = mtu;  in ip_tunnel_update()
994 	dev->mtu = new_mtu;  in __ip_tunnel_change_mtu()
1075 		itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev);  in ip_tunnel_init_net()
1133 	int mtu;  in ip_tunnel_newlink()  local
1157 	mtu = ip_tunnel_bind_dev(dev);  in ip_tunnel_newlink()
1164 		mtu = clamp(dev->mtu, (unsigned int)ETH_MIN_MTU, max);  in ip_tunnel_newlink()
1167 	err = dev_set_mtu(dev, mtu);  in ip_tunnel_newlink()