184 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
186 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
202 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
267 	unsigned int mtu;  in ip6_skb_dst_mtu()  local
273 		mtu = READ_ONCE(skb_dst(skb)->dev->mtu);  in ip6_skb_dst_mtu()
274 		mtu -= lwtunnel_headroom(skb_dst(skb)->lwtstate, mtu);  in ip6_skb_dst_mtu()
276 		mtu = dst_mtu(skb_dst(skb));  in ip6_skb_dst_mtu()
278 	return mtu;  in ip6_skb_dst_mtu()
321 	unsigned int mtu;  in ip6_dst_mtu_forward()  local
324 		mtu = dst_metric_raw(dst, RTAX_MTU);  in ip6_dst_mtu_forward()
325 		if (mtu)  in ip6_dst_mtu_forward()
329 	mtu = IPV6_MIN_MTU;  in ip6_dst_mtu_forward()
333 		mtu = idev->cnf.mtu6;  in ip6_dst_mtu_forward()
337 	return mtu - lwtunnel_headroom(dst->lwtstate, mtu);  in ip6_dst_mtu_forward()