Do not store the key and the gateway of a route entry in the same chunk

of memory.

The key (destination) is only set once, when the route is inserted in
the routing table, and does not need to change afterward.  The gateway
might change and rt_setgate() will do all the checks for you.

ok claudio@

3 files changed, 37 insertions, 32 deletions

diff --git a/sys/net/route.c b/sys/net/route.c
index cd0d51a095f..c3959f26ccf 100644
--- a/sys/net/route.c
+++ b/sys/net/route.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: route.c,v 1.205 2015/02/10 03:04:11 claudio Exp $	*/
+/*	$OpenBSD: route.c,v 1.206 2015/02/11 23:34:43 mpi Exp $	*/
 /*	$NetBSD: route.c,v 1.14 1996/02/13 22:00:46 christos Exp $	*/
 
 /*
@@ -373,6 +373,8 @@ rtfree(struct rtentry *rt)
 		if (rt->rt_flags & RTF_MPLS)
 			free(rt->rt_llinfo, M_TEMP, 0);
 #endif
+		if (rt->rt_gateway)
+			free(rt->rt_gateway, M_RTABLE, 0);
 		free(rt_key(rt), M_RTABLE, 0);
 		pool_put(&rtentry_pool, rt);
 	}
@@ -495,7 +497,7 @@ create:
 			rt->rt_flags |= RTF_MODIFIED;
 			flags |= RTF_MODIFIED;
 			stat = &rtstat.rts_newgateway;
-			rt_setgate(rt, rt_key(rt), gateway, rdomain);
+			rt_setgate(rt, gateway, rdomain);
 		}
 	} else
 		error = EHOSTUNREACH;
@@ -716,7 +718,7 @@ rtrequest1(int req, struct rt_addrinfo *info, u_int8_t prio,
 	struct ifaddr		*ifa;
 	struct sockaddr		*ndst;
 	struct sockaddr_rtlabel	*sa_rl, sa_rl2;
-	int			 error;
+	int			 dlen, error;
 #ifdef MPLS
 	struct sockaddr_mpls	*sa_mpls;
 #endif
@@ -843,22 +845,30 @@ rtrequest1(int req, struct rt_addrinfo *info, u_int8_t prio,
 		if (rt == NULL)
 			return (ENOBUFS);
 
+		dlen = info->rti_info[RTAX_DST]->sa_len;
+		ndst = malloc(dlen, M_RTABLE, M_NOWAIT);
+		if (ndst == NULL) {
+			pool_put(&rtentry_pool, rt);
+			return (ENOBUFS);
+		}
+
 		rt->rt_flags = info->rti_flags;
 		rt->rt_tableid = tableid;
 		rt->rt_priority = prio;	/* init routing priority */
 		LIST_INIT(&rt->rt_timer);
-		if ((error = rt_setgate(rt, info->rti_info[RTAX_DST],
-		    info->rti_info[RTAX_GATEWAY], tableid))) {
+		rt->rt_nodes->rn_key = (caddr_t)ndst;
+		memcpy(ndst, info->rti_info[RTAX_DST], dlen);
+
+		if ((error = rt_setgate(rt, info->rti_info[RTAX_GATEWAY],
+		    tableid))) {
 			pool_put(&rtentry_pool, rt);
 			return (error);
 		}
-		ndst = rt_key(rt);
-		if (info->rti_info[RTAX_NETMASK] != NULL) {
+
+		if (info->rti_info[RTAX_NETMASK] != NULL)
 			rt_maskedcopy(info->rti_info[RTAX_DST], ndst,
 			    info->rti_info[RTAX_NETMASK]);
-		} else
-			memcpy(ndst, info->rti_info[RTAX_DST],
-			    info->rti_info[RTAX_DST]->sa_len);
+
 #ifndef SMALL_KERNEL
 		if (rn_mpath_capable(rnh)) {
 			/* check the link state since the table supports it */
@@ -894,6 +904,8 @@ rtrequest1(int req, struct rt_addrinfo *info, u_int8_t prio,
 			if (rt->rt_llinfo == NULL) {
 				if (rt->rt_gwroute)
 					rtfree(rt->rt_gwroute);
+				if (rt->rt_gateway)
+					free(rt->rt_gateway, M_RTABLE, 0);
 				free(rt_key(rt), M_RTABLE, 0);
 				pool_put(&rtentry_pool, rt);
 				return (ENOMEM);
@@ -964,6 +976,8 @@ rtrequest1(int req, struct rt_addrinfo *info, u_int8_t prio,
 				rtfree(rt->rt_parent);
 			if (rt->rt_gwroute)
 				rtfree(rt->rt_gwroute);
+			if (rt->rt_gateway)
+				free(rt->rt_gateway, M_RTABLE, 0);
 			free(rt_key(rt), M_RTABLE, 0);
 			pool_put(&rtentry_pool, rt);
 			return (EEXIST);
@@ -989,28 +1003,20 @@ rtrequest1(int req, struct rt_addrinfo *info, u_int8_t prio,
 }
 
 int
-rt_setgate(struct rtentry *rt, struct sockaddr *dst, struct sockaddr *gate,
-    u_int tableid)
+rt_setgate(struct rtentry *rt, struct sockaddr *gate, unsigned int tableid)
 {
-	caddr_t	new, old;
-	int	dlen = ROUNDUP(dst->sa_len), glen = ROUNDUP(gate->sa_len);
+	int glen = ROUNDUP(gate->sa_len);
+	struct sockaddr *sa;
 
 	if (rt->rt_gateway == NULL || glen > ROUNDUP(rt->rt_gateway->sa_len)) {
-		old = (caddr_t)rt_key(rt);
-		new = malloc(dlen + glen, M_RTABLE, M_NOWAIT);
-		if (new == NULL)
+		sa = malloc(glen, M_RTABLE, M_NOWAIT);
+		if (sa == NULL)
 			return (ENOBUFS);
-		rt->rt_nodes->rn_key = new;
-	} else {
-		new = rt->rt_nodes->rn_key;
-		old = NULL;
+		free(rt->rt_gateway, M_RTABLE, 0);
+		rt->rt_gateway = sa;
 	}
-	rt->rt_gateway = (struct sockaddr *)(new + dlen);
 	memmove(rt->rt_gateway, gate, glen);
-	if (old) {
-		memmove(new, dst, dlen);
-		free(old, M_RTABLE, 0);
-	}
+
 	if (rt->rt_gwroute != NULL) {
 		rtfree(rt->rt_gwroute);
 		rt->rt_gwroute = NULL;
diff --git a/sys/net/route.h b/sys/net/route.h
index 74a0d5da23e..91637f91676 100644
--- a/sys/net/route.h
+++ b/sys/net/route.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: route.h,v 1.104 2015/01/13 12:14:00 mpi Exp $	*/
+/*	$OpenBSD: route.h,v 1.105 2015/02/11 23:34:43 mpi Exp $	*/
 /*	$NetBSD: route.h,v 1.9 1996/02/13 22:00:49 christos Exp $	*/
 
 /*
@@ -360,8 +360,7 @@ void	 rt_sendmsg(struct rtentry *, int, u_int);
 void	 rt_sendaddrmsg(struct rtentry *, int);
 void	 rt_missmsg(int, struct rt_addrinfo *, int, struct ifnet *, int,
 	    u_int);
-int	 rt_setgate(struct rtentry *, struct sockaddr *,
-	    struct sockaddr *, u_int);
+int	 rt_setgate(struct rtentry *, struct sockaddr *, unsigned int);
 int	 rt_checkgate(struct ifnet *, struct rtentry *, struct sockaddr *,
 	    unsigned int, struct rtentry **);
 void	 rt_setmetrics(u_long, struct rt_metrics *, struct rt_kmetrics *);
diff --git a/sys/net/rtsock.c b/sys/net/rtsock.c
index 2c4802e1068..b4ff9fccf1f 100644
--- a/sys/net/rtsock.c
+++ b/sys/net/rtsock.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: rtsock.c,v 1.156 2015/01/13 12:14:00 mpi Exp $	*/
+/*	$OpenBSD: rtsock.c,v 1.157 2015/02/11 23:34:43 mpi Exp $	*/
 /*	$NetBSD: rtsock.c,v 1.18 1996/03/29 00:32:10 cgd Exp $	*/
 
 /*
@@ -750,8 +750,8 @@ report:
 					newgate = 1;
 				}
 			if (info.rti_info[RTAX_GATEWAY] != NULL &&
-			    (error = rt_setgate(rt, rt_key(rt),
-			    info.rti_info[RTAX_GATEWAY], tableid)))
+			    (error = rt_setgate(rt, info.rti_info[RTAX_GATEWAY],
+			     tableid)))
 				goto flush;
 			/*
 			 * new gateway could require new ifaddr, ifp;