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 23:41:27 -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 23:41:27 -0000
@@ -398,6 +398,20 @@ sendit:
 	}
 #endif /* IPSEC */
 
+	if (ro && ro->ro_rt) {
+		struct rtentry *rt = ro->ro_rt;
+
+		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;
+		}
+	}
+
 	/*
 	 * Packet filter
 	 */
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 23:41:27 -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 */