206 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
208 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
224 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
307 	return INDIRECT_CALL_1(dst->ops->mtu, ip6_mtu, dst);  in dst6_mtu()
315 	unsigned int mtu;  in ip6_skb_dst_mtu()  local
318 		mtu = READ_ONCE(dst_dev(dst)->mtu);  in ip6_skb_dst_mtu()
319 		mtu -= lwtunnel_headroom(dst->lwtstate, mtu);  in ip6_skb_dst_mtu()
321 		mtu = dst_mtu(dst);  in ip6_skb_dst_mtu()
323 	return mtu;  in ip6_skb_dst_mtu()
371 	unsigned int mtu;  in ip6_dst_mtu_maybe_forward()  local
374 		mtu = dst_metric_raw(dst, RTAX_MTU);  in ip6_dst_mtu_maybe_forward()
375 		if (mtu)  in ip6_dst_mtu_maybe_forward()
379 	mtu = IPV6_MIN_MTU;  in ip6_dst_mtu_maybe_forward()
383 		mtu = READ_ONCE(idev->cnf.mtu6);  in ip6_dst_mtu_maybe_forward()
387 	mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);  in ip6_dst_mtu_maybe_forward()
389 	return mtu - lwtunnel_headroom(dst->lwtstate, mtu);  in ip6_dst_mtu_maybe_forward()
406 	unsigned int mtu = 0;  in ip6_dst_mtu_configured()  local
416 		mtu = from->fib6_pmtu;  in ip6_dst_mtu_configured()
417 	if (!mtu) {  in ip6_dst_mtu_configured()
418 		mtu = IPV6_MIN_MTU;  in ip6_dst_mtu_configured()
421 			mtu = max_t(unsigned int, mtu, READ_ONCE(idev->cnf.mtu6));  in ip6_dst_mtu_configured()
425 	mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);  in ip6_dst_mtu_configured()
426 	return mtu - lwtunnel_headroom(dst->lwtstate, mtu);  in ip6_dst_mtu_configured()