Index: net/if_loop.c
===================================================================
RCS file: /cvs/src/sys/net/if_loop.c,v
diff -u -p -r1.98 if_loop.c
--- net/if_loop.c	29 Dec 2023 11:43:04 -0000	1.98
+++ net/if_loop.c	25 Jul 2024 04:24:51 -0000
@@ -261,12 +261,6 @@ looutput(struct ifnet *ifp, struct mbuf 
 	if ((m->m_flags & M_PKTHDR) == 0)
 		panic("%s: no header mbuf", __func__);
 
-	if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
-		m_freem(m);
-		return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
-			rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
-	}
-
 	/*
 	 * Do not call if_input_local() directly.  Queue the packet to avoid
 	 * stack overflow and make TCP handshake over loopback work.
Index: netinet/ip_output.c
===================================================================
RCS file: /cvs/src/sys/netinet/ip_output.c,v
diff -u -p -r1.400 ip_output.c
--- netinet/ip_output.c	7 Jun 2024 18:24:16 -0000	1.400
+++ netinet/ip_output.c	25 Jul 2024 04:24:51 -0000
@@ -184,22 +184,33 @@ reroute:
 		}
 	} else {
 		struct in_ifaddr *ia;
+		struct rtentry *rt;
 
 		if (ro->ro_rt == NULL)
 			ro->ro_rt = rtalloc_mpath(&ro->ro_dstsa,
 			    &ip->ip_src.s_addr, ro->ro_tableid);
 
-		if (ro->ro_rt == NULL) {
+		rt = ro->ro_rt;
+		if (rt == NULL) {
 			ipstat_inc(ips_noroute);
 			error = EHOSTUNREACH;
 			goto bad;
 		}
+		if (ISSET(rt->rt_flags, RTF_REJECT)) {
+			error = ISSET(rt->rt_flags, RTF_HOST) ?
+			    EHOSTUNREACH : ENETUNREACH;
+			goto bad;
+		}
+		if (ISSET(rt->rt_flags, RTF_BLACKHOLE)) {
+			error = 0;
+			goto bad;
+		}
 
-		ia = ifatoia(ro->ro_rt->rt_ifa);
-		if (ISSET(ro->ro_rt->rt_flags, RTF_LOCAL))
+		ia = ifatoia(rt->rt_ifa);
+		if (ISSET(rt->rt_flags, RTF_LOCAL))
 			ifp = if_get(rtable_loindex(m->m_pkthdr.ph_rtableid));
 		else
-			ifp = if_get(ro->ro_rt->rt_ifidx);
+			ifp = if_get(rt->rt_ifidx);
 		/*
 		 * We aren't using rtisvalid() here because the UP/DOWN state
 		 * machine is broken with some Ethernet drivers like em(4).
@@ -211,11 +222,11 @@ reroute:
 			error = EHOSTUNREACH;
 			goto bad;
 		}
-		if ((mtu = ro->ro_rt->rt_mtu) == 0)
+		if ((mtu = rt->rt_mtu) == 0)
 			mtu = ifp->if_mtu;
 
-		if (ro->ro_rt->rt_flags & RTF_GATEWAY)
-			dst = satosin(ro->ro_rt->rt_gateway);
+		if (ISSET(rt->rt_flags, RTF_GATEWAY))
+			dst = satosin(rt->rt_gateway);
 
 		/* Set the source IP address */
 		if (ip->ip_src.s_addr == INADDR_ANY && ia)
Index: netinet6/ip6_output.c
===================================================================
RCS file: /cvs/src/sys/netinet6/ip6_output.c,v
diff -u -p -r1.291 ip6_output.c
--- netinet6/ip6_output.c	17 Apr 2024 20:48:51 -0000	1.291
+++ netinet6/ip6_output.c	25 Jul 2024 04:24:51 -0000
@@ -483,9 +483,20 @@ reroute:
 		route6_cache(ro, &ip6->ip6_dst, NULL, m->m_pkthdr.ph_rtableid);
 	}
 
-	if (rt && (rt->rt_flags & RTF_GATEWAY) &&
-	    !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
-		dst = satosin6(rt->rt_gateway);
+	if (rt != NULL) {
+		if (ISSET(rt->rt_flags, RTF_REJECT)) {
+			error = ISSET(rt->rt_flags, RTF_HOST) ?
+			    EHOSTUNREACH : ENETUNREACH;
+			goto bad;
+		}
+		if (ISSET(rt->rt_flags, RTF_BLACKHOLE)) {
+			error = 0;
+			goto bad;
+		}
+		if (ISSET(rt->rt_flags, RTF_GATEWAY) &&
+		    !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
+			dst = satosin6(rt->rt_gateway);
+	}
 
 	if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 		/* Unicast */