From 220df611e015e766c23f479345306f23905826fe Mon Sep 17 00:00:00 2001
From: henning <henning@openbsd.org>
Date: Sun, 20 Apr 2014 14:54:39 +0000
Subject: [PATCH] ether_output: instead of assembling the ethernet header and
 then calling carp_rewrite_lladdr to overwrite the src lladdr, get the
 intended src lladdr before assembling the ethernet header.
 carp_rewrite_lladdr -> carp_get_srclladdr ok reyk claudio

---
 sys/net/if_ethersubr.c | 11 +++++------
 sys/netinet/ip_carp.c  | 13 ++++++-------
 sys/netinet/ip_carp.h  |  4 ++--
 3 files changed, 13 insertions(+), 15 deletions(-)

diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c
index 0ccb5c5cd2f..cf0de756f43 100644
--- a/sys/net/if_ethersubr.c
+++ b/sys/net/if_ethersubr.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_ethersubr.c,v 1.166 2014/04/20 14:51:50 henning Exp $	*/
+/*	$OpenBSD: if_ethersubr.c,v 1.167 2014/04/20 14:54:39 henning Exp $	*/
 /*	$NetBSD: if_ethersubr.c,v 1.19 1996/05/07 02:40:30 thorpej Exp $	*/
 
 /*
@@ -343,6 +343,10 @@ ether_output(struct ifnet *ifp0, struct mbuf *m0, struct sockaddr *dst,
 
 	if (!hdrcmplt)
 		esrc = ac->ac_enaddr;
+#if NCARP > 0
+	if (ifp0 != ifp && ifp0->if_type == IFT_CARP)
+		esrc = carp_get_srclladdr(ifp0, esrc);
+#endif
 
 	/*
 	 * Add local net header.  If no space in first mbuf,
@@ -356,11 +360,6 @@ ether_output(struct ifnet *ifp0, struct mbuf *m0, struct sockaddr *dst,
 	memcpy(eh->ether_dhost, edst, sizeof(eh->ether_dhost));
 	memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost));
 
-#if NCARP > 0
-	if (ifp0 != ifp && ifp0->if_type == IFT_CARP)
-	    carp_rewrite_lladdr(ifp0, eh->ether_shost);
-#endif
-
 #if NBRIDGE > 0
 	/*
 	 * Interfaces that are bridgeports need special handling for output.
diff --git a/sys/netinet/ip_carp.c b/sys/netinet/ip_carp.c
index 1b95591028b..9228d89e48e 100644
--- a/sys/netinet/ip_carp.c
+++ b/sys/netinet/ip_carp.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ip_carp.c,v 1.226 2014/04/14 09:06:42 mpi Exp $	*/
+/*	$OpenBSD: ip_carp.c,v 1.227 2014/04/20 14:54:39 henning Exp $	*/
 
 /*
  * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
@@ -1519,20 +1519,19 @@ carp_ourether(void *v, u_int8_t *ena)
 	return (NULL);
 }
 
-void
-carp_rewrite_lladdr(struct ifnet *ifp, u_int8_t *s_enaddr)
+u_char *
+carp_get_srclladdr(struct ifnet *ifp, u_char *esrc)
 {
 	struct carp_softc *sc = ifp->if_softc;
 
 	if (sc->sc_balancing != CARP_BAL_IPSTEALTH &&
 	    sc->sc_balancing != CARP_BAL_IP && sc->cur_vhe) {
 		if (sc->cur_vhe->vhe_leader)
-			bcopy((caddr_t)sc->sc_ac.ac_enaddr,
-			    (caddr_t)s_enaddr, ETHER_ADDR_LEN);
+			return (sc->sc_ac.ac_enaddr);
 		else
-			bcopy((caddr_t)sc->cur_vhe->vhe_enaddr,
-			    (caddr_t)s_enaddr, ETHER_ADDR_LEN);
+			return (sc->cur_vhe->vhe_enaddr);
 	}
+	return (esrc);
 }
 
 int
diff --git a/sys/netinet/ip_carp.h b/sys/netinet/ip_carp.h
index 69c7c4abecf..b73e2d8be7a 100644
--- a/sys/netinet/ip_carp.h
+++ b/sys/netinet/ip_carp.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ip_carp.h,v 1.30 2014/01/22 09:35:20 mpi Exp $	*/
+/*	$OpenBSD: ip_carp.h,v 1.31 2014/04/20 14:54:39 henning Exp $	*/
 
 /*
  * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
@@ -178,7 +178,7 @@ int		 carp_output(struct ifnet *, struct mbuf *, struct sockaddr *,
 		     struct rtentry *);
 int		 carp_sysctl(int *, u_int,  void *, size_t *, void *, size_t);
 int		 carp_lsdrop(struct mbuf *, sa_family_t, u_int32_t *, u_int32_t *);
-void		 carp_rewrite_lladdr(struct ifnet *, u_int8_t *);
+u_char		*carp_get_srclladdr(struct ifnet *, u_char *);
 int		 carp_our_mcastaddr(struct ifnet *, u_int8_t *);
 #endif /* _KERNEL */
 #endif /* _NETINET_IP_CARP_H_ */
-- 
2.20.1