Remove rti_ifp from rt_addrinfo, one less ifp pointer, say yay!

This pointer was only needed by rt_getifa() to find an address, so
turn it into a local variable.

ok henning@, bluhm@

3 files changed, 13 insertions, 15 deletions

diff --git a/sys/net/route.c b/sys/net/route.c
index 49f73e5afd8..ca23aa83e04 100644
--- a/sys/net/route.c
+++ b/sys/net/route.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: route.c,v 1.163 2014/04/23 09:30:57 mpi Exp $	*/
+/*	$OpenBSD: route.c,v 1.164 2014/04/25 10:41:09 mpi Exp $	*/
 /*	$NetBSD: route.c,v 1.14 1996/02/13 22:00:46 christos Exp $	*/
 
 /*
@@ -691,16 +691,17 @@ int
 rt_getifa(struct rt_addrinfo *info, u_int rtid)
 {
 	struct ifaddr	*ifa;
+	struct ifnet	*ifp = NULL;
 
 	/*
 	 * ifp may be specified by sockaddr_dl when protocol address
 	 * is ambiguous
 	 */
-	if (info->rti_ifp == NULL && info->rti_info[RTAX_IFP] != NULL) {
+	if (info->rti_info[RTAX_IFP] != NULL) {
 		struct sockaddr_dl *sdl;
 
 		sdl = (struct sockaddr_dl *)info->rti_info[RTAX_IFP];
-		info->rti_ifp = if_get(sdl->sdl_index);
+		ifp = if_get(sdl->sdl_index);
 	}
 
 	if (info->rti_ifa == NULL && info->rti_info[RTAX_IFA] != NULL)
@@ -713,8 +714,8 @@ rt_getifa(struct rt_addrinfo *info, u_int rtid)
 			if ((sa = info->rti_info[RTAX_GATEWAY]) == NULL)
 				sa = info->rti_info[RTAX_DST];
 
-		if (sa != NULL && info->rti_ifp != NULL)
-			info->rti_ifa = ifaof_ifpforaddr(sa, info->rti_ifp);
+		if (sa != NULL && ifp != NULL)
+			info->rti_ifa = ifaof_ifpforaddr(sa, ifp);
 		else if (info->rti_info[RTAX_DST] != NULL &&
 		    info->rti_info[RTAX_GATEWAY] != NULL)
 			info->rti_ifa = ifa_ifwithroute(info->rti_flags,
@@ -729,9 +730,6 @@ rt_getifa(struct rt_addrinfo *info, u_int rtid)
 	if ((ifa = info->rti_ifa) == NULL)
 		return (ENETUNREACH);
 
-	if (info->rti_ifp == NULL)
-		info->rti_ifp = ifa->ifa_ifp;
-
 	return (0);
 }
 
@@ -828,8 +826,10 @@ rtrequest1(int req, struct rt_addrinfo *info, u_int8_t prio,
 			info->rti_ifa = rt->rt_ifa;
 		} else {
 			/*
-			 * The interface address at the cloning route
-			 * is not longer referenced by an interface.
+			 * The address of the cloning route is not longer
+			 * configured on an interface, but its descriptor
+			 * is still there because of reference counting.
+			 *
 			 * Try to find a similar active address and use
 			 * it for the cloned route.  The cloning route
 			 * will get the new address and interface later.
@@ -837,7 +837,6 @@ rtrequest1(int req, struct rt_addrinfo *info, u_int8_t prio,
 			info->rti_ifa = NULL;
 			info->rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
 		}
-		info->rti_ifp = rt->rt_ifp;
 		info->rti_flags = rt->rt_flags & ~(RTF_CLONING | RTF_STATIC);
 		info->rti_flags |= RTF_CLONED;
 		info->rti_info[RTAX_GATEWAY] = rt->rt_gateway;
diff --git a/sys/net/route.h b/sys/net/route.h
index 499d8d15bc6..988b8742c9d 100644
--- a/sys/net/route.h
+++ b/sys/net/route.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: route.h,v 1.91 2014/04/10 13:47:21 mpi Exp $	*/
+/*	$OpenBSD: route.h,v 1.92 2014/04/25 10:41:09 mpi Exp $	*/
 /*	$NetBSD: route.h,v 1.9 1996/02/13 22:00:49 christos Exp $	*/
 
 /*
@@ -299,7 +299,6 @@ struct rt_addrinfo {
 	struct	sockaddr *rti_info[RTAX_MAX];
 	int	rti_flags;
 	struct	ifaddr *rti_ifa;
-	struct	ifnet *rti_ifp;
 	struct	rt_msghdr *rti_rtm;
 	u_char	rti_mpls;
 };
diff --git a/sys/net/rtsock.c b/sys/net/rtsock.c
index 98e2cc93235..4178fe6aa22 100644
--- a/sys/net/rtsock.c
+++ b/sys/net/rtsock.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: rtsock.c,v 1.142 2014/03/18 10:47:34 mpi Exp $	*/
+/*	$OpenBSD: rtsock.c,v 1.143 2014/04/25 10:41:09 mpi Exp $	*/
 /*	$NetBSD: rtsock.c,v 1.18 1996/03/29 00:32:10 cgd Exp $	*/
 
 /*
@@ -768,7 +768,7 @@ report:
 					ifafree(rt->rt_ifa);
 					rt->rt_ifa = ifa;
 					ifa->ifa_refcnt++;
-					rt->rt_ifp = info.rti_ifp;
+					rt->rt_ifp = ifa->ifa_ifp;
 #ifndef SMALL_KERNEL
 					/* recheck link state after ifp change*/
 					rt_if_linkstate_change(