420 	u_long mtu;  in ip6_output()  local
682 	mtu = 0;  in ip6_output()
731 			mtu = ifp->if_mtu;  in ip6_output()
948 		    &mtu, &alwaysfrag, fibnum, *nexthdrp)) != 0)  in ip6_output()
950 	KASSERT(mtu > 0, ("%s:%d: mtu %ld, ro_pmtu %p ro %p ifp %p "  in ip6_output()
951 	    "alwaysfrag %d fibnum %u\n", __func__, __LINE__, mtu, ro_pmtu, ro,  in ip6_output()
966 	if (mtu > IPV6_MMTU) {  in ip6_output()
968 			mtu = IPV6_MMTU;  in ip6_output()
970 			mtu = IPV6_MMTU;  in ip6_output()
974 			mtu = IPV6_MMTU;  in ip6_output()
1170 			ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu);  in ip6_output()
1176 	if (dontfrag || (!alwaysfrag && tlen <= mtu)) {	/* Cases 1-a and 2-a. */  in ip6_output()
1193 	if (mtu < IPV6_MMTU) {  in ip6_output()
1211 		if (mtu > IPV6_MAXPACKET)  in ip6_output()
1212 			mtu = IPV6_MAXPACKET;  in ip6_output()
1214 		len = (mtu - unfragpartlen - sizeof(struct ip6_frag)) & ~7;  in ip6_output()
1504 	u_long mtu;  in ip6_getpmtu()  local
1508 	mtu = 0;  in ip6_getpmtu()
1531 				mtu = nh->nh_mtu;  in ip6_getpmtu()
1533 					ro_pmtu->ro_mtu = mtu;  in ip6_getpmtu()
1536 			mtu = ro_pmtu->ro_mtu;  in ip6_getpmtu()
1540 		mtu = ro_pmtu->ro_nh->nh_mtu;  in ip6_getpmtu()
1542 	return (ip6_calcmtu(ifp, dst, mtu, mtup, alwaysfragp, proto));  in ip6_getpmtu()
1556 	u_long mtu = 0;  in ip6_calcmtu()  local
1572 			mtu = tcp_hc_getmtu(&inc);  in ip6_calcmtu()
1574 		if (mtu)  in ip6_calcmtu()
1575 			mtu = min(mtu, rt_mtu);  in ip6_calcmtu()
1577 			mtu = rt_mtu;  in ip6_calcmtu()
1578 		if (mtu == 0)  in ip6_calcmtu()
1579 			mtu = ifmtu;  in ip6_calcmtu()
1580 		else if (mtu < IPV6_MMTU) {  in ip6_calcmtu()
1590 			mtu = IPV6_MMTU;  in ip6_calcmtu()
1593 		mtu = IN6_LINKMTU(ifp);  in ip6_calcmtu()
1597 	*mtup = mtu;  in ip6_calcmtu()