189 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
191 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
207 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
272 	return INDIRECT_CALL_1(dst->ops->mtu, ip6_mtu, dst);  in dst6_mtu()
280 	unsigned int mtu;  in ip6_skb_dst_mtu()  local
283 		mtu = READ_ONCE(dst_dev(dst)->mtu);  in ip6_skb_dst_mtu()
284 		mtu -= lwtunnel_headroom(dst->lwtstate, mtu);  in ip6_skb_dst_mtu()
286 		mtu = dst_mtu(dst);  in ip6_skb_dst_mtu()
288 	return mtu;  in ip6_skb_dst_mtu()
336 	unsigned int mtu;  in ip6_dst_mtu_maybe_forward()  local
339 		mtu = dst_metric_raw(dst, RTAX_MTU);  in ip6_dst_mtu_maybe_forward()
340 		if (mtu)  in ip6_dst_mtu_maybe_forward()
344 	mtu = IPV6_MIN_MTU;  in ip6_dst_mtu_maybe_forward()
348 		mtu = READ_ONCE(idev->cnf.mtu6);  in ip6_dst_mtu_maybe_forward()
352 	return mtu - lwtunnel_headroom(dst->lwtstate, mtu);  in ip6_dst_mtu_maybe_forward()