183 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
185 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
201 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
266 	unsigned int mtu;  in ip6_skb_dst_mtu()  local
272 		mtu = READ_ONCE(skb_dst(skb)->dev->mtu);  in ip6_skb_dst_mtu()
273 		mtu -= lwtunnel_headroom(skb_dst(skb)->lwtstate, mtu);  in ip6_skb_dst_mtu()
275 		mtu = dst_mtu(skb_dst(skb));  in ip6_skb_dst_mtu()
277 	return mtu;  in ip6_skb_dst_mtu()
320 	unsigned int mtu;  in ip6_dst_mtu_forward()  local
323 		mtu = dst_metric_raw(dst, RTAX_MTU);  in ip6_dst_mtu_forward()
324 		if (mtu)  in ip6_dst_mtu_forward()
328 	mtu = IPV6_MIN_MTU;  in ip6_dst_mtu_forward()
332 		mtu = idev->cnf.mtu6;  in ip6_dst_mtu_forward()
336 	return mtu - lwtunnel_headroom(dst->lwtstate, mtu);  in ip6_dst_mtu_forward()