Use the route generation number also for IPv6.

Implement route6_cache() to check whether the cached route is still
valid and otherwise fill caching parameter of struct route_in6.
Also count cache hits and misses in netstat.  in_pcbrtentry() uses
route cache now.

OK claudio@

1 files changed, 4 insertions, 18 deletions

diff --git a/sys/netinet/in_pcb.c b/sys/netinet/in_pcb.c
index fd6417eead0..456135a722c 100644
--- a/sys/netinet/in_pcb.c
+++ b/sys/netinet/in_pcb.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: in_pcb.c,v 1.289 2024/02/02 15:39:23 bluhm Exp $	*/
+/*	$OpenBSD: in_pcb.c,v 1.290 2024/02/07 23:40:40 bluhm Exp $	*/
 /*	$NetBSD: in_pcb.c,v 1.25 1996/02/13 23:41:53 christos Exp $	*/
 
 /*
@@ -916,24 +916,10 @@ in_pcbrtentry(struct inpcb *inp)
 
 	ro = &inp->inp_route;
 
-	/* check if route is still valid */
-	if (!rtisvalid(ro->ro_rt)) {
-		rtfree(ro->ro_rt);
-		ro->ro_rt = NULL;
-	}
-
-	/*
-	 * No route yet, so try to acquire one.
-	 */
+	if (inp->inp_faddr.s_addr == INADDR_ANY)
+		return (NULL);
+	route_cache(ro, inp->inp_faddr, inp->inp_rtableid);
 	if (ro->ro_rt == NULL) {
-		memset(ro, 0, sizeof(struct route));
-
-		if (inp->inp_faddr.s_addr == INADDR_ANY)
-			return (NULL);
-		ro->ro_dst.sa_family = AF_INET;
-		ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
-		satosin(&ro->ro_dst)->sin_addr = inp->inp_faddr;
-		ro->ro_tableid = inp->inp_rtableid;
 		ro->ro_rt = rtalloc_mpath(&ro->ro_dst,
 		    &inp->inp_laddr.s_addr, ro->ro_tableid);
 	}