[IPV6]: ROUTE: Split up rt6_cow() for future changes.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 21 insertions, 11 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index e0d3ad02ffb5..e8855706980f 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -401,10 +401,9 @@ int ip6_ins_rt(struct rt6_info *rt, struct nlmsghdr *nlh,
    with dst->error set to errno value.
  */
 
-static struct rt6_info *rt6_cow(struct rt6_info *ort, struct in6_addr *daddr,
-                                struct in6_addr *saddr, struct netlink_skb_parms *req)
+static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr,
+                                      struct in6_addr *saddr)
 {
-        int err;
         struct rt6_info *rt;
 
         /*
@@ -435,18 +434,29 @@ static struct rt6_info *rt6_cow(struct rt6_info *ort, struct in6_addr *daddr,
 
                 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
 
-                dst_hold(&rt->u.dst);
+        }
 
-                err = ip6_ins_rt(rt, NULL, NULL, req);
-                if (err == 0)
-                        return rt;
+        return rt;
+}
 
-                rt->u.dst.error = err;
+static struct rt6_info *rt6_cow(struct rt6_info *ort, struct in6_addr *daddr,
+                                struct in6_addr *saddr, struct netlink_skb_parms *req)
+{
+        struct rt6_info *rt = rt6_alloc_cow(ort, daddr, saddr);
+        int err;
 
-                return rt;
+        if (!rt) {
+                dst_hold(&ip6_null_entry.u.dst);
+                return &ip6_null_entry;
         }
-        dst_hold(&ip6_null_entry.u.dst);
-        return &ip6_null_entry;
+
+        dst_hold(&rt->u.dst);
+
+        err = ip6_ins_rt(rt, NULL, NULL, req);
+        if (err)
+                rt->u.dst.error = err;
+
+        return rt;
 }
 
 #define BACKTRACK() \