[src/trunk]: src/sys/netinet arp: report RTM_MISS when removing an unresolved...

[roy <roy%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2bca50b5cdf1
branches:  trunk
changeset: 1008075:2bca50b5cdf1
user:      roy <roy%NetBSD.org@localhost>
date:      Mon Mar 09 17:57:19 2020 +0000

description:
arp: report RTM_MISS when removing an unresolved entry in the arp table

Otherwise we only get it when renewing and we've sent too many requests.
This mirrors INET6 behaviour.

diffstat:

 sys/netinet/if_arp.c |  22 +++++++++++++---------
 1 files changed, 13 insertions(+), 9 deletions(-)

diffs (48 lines):

diff -r 49e47045cab9 -r 2bca50b5cdf1 sys/netinet/if_arp.c
--- a/sys/netinet/if_arp.c      Mon Mar 09 17:27:29 2020 +0000
+++ b/sys/netinet/if_arp.c      Mon Mar 09 17:57:19 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_arp.c,v 1.292 2020/01/23 17:27:35 roy Exp $ */
+/*     $NetBSD: if_arp.c,v 1.293 2020/03/09 17:57:19 roy Exp $ */
 
 /*
  * Copyright (c) 1998, 2000, 2008 The NetBSD Foundation, Inc.
@@ -68,7 +68,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_arp.c,v 1.292 2020/01/23 17:27:35 roy Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_arp.c,v 1.293 2020/03/09 17:57:19 roy Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_ddb.h"
@@ -307,18 +307,22 @@
 
        /* Guard against race with other llentry_free(). */
        if (lle->la_flags & LLE_LINKED) {
+               int rt_cmd;
+               struct in_addr *in;
+               struct sockaddr_in sin;
+               const char *lladdr;
                size_t pkts_dropped;
 
+               in = &lle->r_l3addr.addr4;
+               sockaddr_in_init(&sin, in, 0);
                if (lle->la_flags & LLE_VALID) {
-                       struct in_addr *in;
-                       struct sockaddr_in sin;
-                       const char *lladdr;
-
-                       in = &lle->r_l3addr.addr4;
-                       sockaddr_in_init(&sin, in, 0);
+                       rt_cmd = RTM_DELETE;
                        lladdr = (const char *)&lle->ll_addr;
-                       rt_clonedmsg(RTM_DELETE, sintosa(&sin), lladdr, ifp);
+               } else {
+                       rt_cmd = RTM_MISS;
+                       lladdr = NULL;
                }
+               rt_clonedmsg(rt_cmd, sintosa(&sin), lladdr, ifp);
 
                LLE_REMREF(lle);
                pkts_dropped = llentry_free(lle);