[src/trunk]: src/sys/net/lagg Drop unicast packets that are not for us

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

details:   https://anonhg.NetBSD.org/src/rev/1fffd2dafd04
branches:  trunk
changeset: 1023949:1fffd2dafd04
user:      yamaguchi <yamaguchi%NetBSD.org@localhost>
date:      Tue Oct 05 04:17:58 2021 +0000

description:
Drop unicast packets that are not for us
when lagg(4) is not in promisc

diffstat:

 sys/net/lagg/if_lagg.c |  26 +++++++++++++++++++++++---
 1 files changed, 23 insertions(+), 3 deletions(-)

diffs (54 lines):

diff -r 5d4e3e5ebbfb -r 1fffd2dafd04 sys/net/lagg/if_lagg.c
--- a/sys/net/lagg/if_lagg.c    Tue Oct 05 04:09:49 2021 +0000
+++ b/sys/net/lagg/if_lagg.c    Tue Oct 05 04:17:58 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_lagg.c,v 1.10 2021/09/30 04:29:17 yamaguchi Exp $   */
+/*     $NetBSD: if_lagg.c,v 1.11 2021/10/05 04:17:58 yamaguchi Exp $   */
 
 /*
  * Copyright (c) 2005, 2006 Reyk Floeter <reyk%openbsd.org@localhost>
@@ -20,7 +20,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_lagg.c,v 1.10 2021/09/30 04:29:17 yamaguchi Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_lagg.c,v 1.11 2021/10/05 04:17:58 yamaguchi Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_inet.h"
@@ -1104,6 +1104,27 @@
        lagg_port_getref(lp, &psref);
        pserialize_read_exit(s);
 
+       ifp = &lp->lp_softc->sc_if;
+
+       /*
+        * Drop promiscuously received packets
+        * if we are not in promiscuous mode.
+        */
+       if ((m->m_flags & (M_BCAST | M_MCAST)) == 0 &&
+           (ifp_port->if_flags & IFF_PROMISC) != 0 &&
+           (ifp->if_flags & IFF_PROMISC) == 0) {
+               struct ether_header *eh;
+
+               eh = mtod(m, struct ether_header *);
+               if (memcmp(CLLADDR(ifp->if_sadl),
+                   eh->ether_dhost, ETHER_ADDR_LEN) != 0) {
+                       m_freem(m);
+                       m = NULL;
+                       if_statinc(ifp, if_ierrors);
+                       goto out;
+               }
+       }
+
        if (pfil_run_hooks(ifp_port->if_pfil, &m,
            ifp_port, PFIL_IN) != 0) {
                goto out;
@@ -1111,7 +1132,6 @@
 
        m = lagg_proto_input(lp->lp_softc, lp, m);
        if (m != NULL) {
-               ifp = &lp->lp_softc->sc_if;
                m_set_rcvif(m, ifp);
                if_input(ifp, m);
                m = NULL;