[src/trunk]: src Make CARP on IPv6 work

[ozaki-r <ozaki-r%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f82505474563
branches:  trunk
changeset: 351799:f82505474563
user:      ozaki-r <ozaki-r%NetBSD.org@localhost>
date:      Mon Feb 27 08:26:53 2017 +0000

description:
Make CARP on IPv6 work

It passes ATF tests but no more, no less.

diffstat:

 sys/netinet/ip_carp.c     |  28 +++++++++++++++-------------
 tests/net/carp/t_basic.sh |   4 +---
 2 files changed, 16 insertions(+), 16 deletions(-)

diffs (115 lines):

diff -r 64703bbfb4dc -r f82505474563 sys/netinet/ip_carp.c
--- a/sys/netinet/ip_carp.c     Mon Feb 27 07:25:59 2017 +0000
+++ b/sys/netinet/ip_carp.c     Mon Feb 27 08:26:53 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ip_carp.c,v 1.84 2017/02/02 02:52:10 ozaki-r Exp $     */
+/*     $NetBSD: ip_carp.c,v 1.85 2017/02/27 08:26:53 ozaki-r Exp $     */
 /*     $OpenBSD: ip_carp.c,v 1.113 2005/11/04 08:11:54 mcbride Exp $   */
 
 /*
@@ -33,7 +33,7 @@
 #endif
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ip_carp.c,v 1.84 2017/02/02 02:52:10 ozaki-r Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ip_carp.c,v 1.85 2017/02/27 08:26:53 ozaki-r Exp $");
 
 /*
  * TODO:
@@ -252,6 +252,12 @@
        return (in_cksum(m, len));
 }
 
+static __inline u_int16_t
+carp6_cksum(struct mbuf *m, uint32_t off, uint32_t len)
+{
+       return (in6_cksum(m, IPPROTO_CARP, off, len));
+}
+
 static void
 carp_hmac_prepare(struct carp_softc *sc)
 {
@@ -601,16 +607,13 @@
                return;
        }
 
-
        /* verify the CARP checksum */
-       m->m_data += off;
-       if (carp_cksum(m, sizeof(*ch))) {
+       if (carp6_cksum(m, off, sizeof(*ch))) {
                CARP_STATINC(CARP_STAT_BADSUM);
                CARP_LOG(sc, ("checksum failed, on %s", rcvif->if_xname));
                m_freem(m);
                return;
        }
-       m->m_data -= off;
 
        carp_proto_input_c(m, ch, AF_INET6);
        return;
@@ -1120,7 +1123,7 @@
                }
        }
 #endif /* INET */
-#ifdef INET6_notyet
+#ifdef INET6
        if (sc->sc_naddrs6) {
                struct ip6_hdr *ip6;
                struct ifaddr *ifa;
@@ -1161,7 +1164,7 @@
 
                ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
                ip6->ip6_dst.s6_addr8[15] = 0x12;
-               if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
+               if (in6_setscope(&ip6->ip6_dst, &sc->sc_if, NULL) != 0) {
                        sc->sc_if.if_oerrors++;
                        m_freem(m);
                        CARP_LOG(sc, ("in6_setscope failed"));
@@ -1173,9 +1176,8 @@
                if (carp_prepare_ad(m, sc, ch_ptr))
                        goto retry_later;
 
-               m->m_data += sizeof(*ip6);
-               ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
-               m->m_data -= sizeof(*ip6);
+               ch_ptr->carp_cksum = carp6_cksum(m, sizeof(*ip6),
+                   len - sizeof(*ip6));
 
                nanotime(&sc->sc_if.if_lastchange);
                sc->sc_if.if_opackets++;
@@ -1530,7 +1532,7 @@
                        callout_schedule(&sc->sc_md_tmo, tvtohz(&tv));
                        break;
 #endif /* INET */
-#ifdef INET6_notyet
+#ifdef INET6
                case AF_INET6:
                        callout_schedule(&sc->sc_md6_tmo, tvtohz(&tv));
                        break;
@@ -1538,7 +1540,7 @@
                default:
                        if (sc->sc_naddrs)
                                callout_schedule(&sc->sc_md_tmo, tvtohz(&tv));
-#ifdef INET6_notyet
+#ifdef INET6
                        if (sc->sc_naddrs6)
                                callout_schedule(&sc->sc_md6_tmo, tvtohz(&tv));
 #endif /* INET6 */
diff -r 64703bbfb4dc -r f82505474563 tests/net/carp/t_basic.sh
--- a/tests/net/carp/t_basic.sh Mon Feb 27 07:25:59 2017 +0000
+++ b/tests/net/carp/t_basic.sh Mon Feb 27 08:26:53 2017 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: t_basic.sh,v 1.3 2017/02/27 07:25:59 ozaki-r Exp $
+#      $NetBSD: t_basic.sh,v 1.4 2017/02/27 08:26:53 ozaki-r Exp $
 #
 # Copyright (c) 2017 Internet Initiative Japan Inc.
 # All rights reserved.
@@ -273,8 +273,6 @@
 {
        local op=$1
 
-       atf_expect_fail 'The implementation of CARP on IPv6 is incomplete yet.'
-
        rump_server_start $SOCK_CLIENT netinet6
        rump_server_start $SOCK_MASTER netinet6
        rump_server_start $SOCK_BACKUP netinet6