[IPV6]: ROUTE: Add rt6_alloc_clone() for cloning route allocation.

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

1 files changed, 18 insertions, 9 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 6d506230622a..4a8cb041f075 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -459,6 +459,21 @@ static struct rt6_info *rt6_cow(struct rt6_info *ort, struct in6_addr *daddr,
         return rt;
 }
 
+static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr)
+{
+        struct rt6_info *rt = ip6_rt_copy(ort);
+        if (rt) {
+                ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
+                rt->rt6i_dst.plen = 128;
+                rt->rt6i_flags |= RTF_CACHE;
+                if (rt->rt6i_flags & RTF_REJECT)
+                        rt->u.dst.error = ort->u.dst.error;
+                rt->u.dst.flags |= DST_HOST;
+                rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop);
+        }
+        return rt;
+}
+
 #define BACKTRACK() \
 if (rt == &ip6_null_entry && strict) { \
        while ((fn = fn->parent) != NULL) { \
@@ -1240,17 +1255,11 @@ void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
 
                 ip6_ins_rt(nrt, NULL, NULL, NULL);
         } else {
-                nrt = ip6_rt_copy(rt);
-                if (nrt == NULL)
+                nrt = rt6_alloc_clone(rt, daddr);
+                if (!nrt)
                         goto out;
-                ipv6_addr_copy(&nrt->rt6i_dst.addr, daddr);
-                nrt->rt6i_dst.plen = 128;
-                nrt->u.dst.flags |= DST_HOST;
-                nrt->rt6i_nexthop = neigh_clone(rt->rt6i_nexthop);
                 dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
-                nrt->rt6i_flags |= RTF_DYNAMIC|RTF_CACHE|RTF_EXPIRES;
-                if (nrt->rt6i_flags & RTF_REJECT)
-                        nrt->u.dst.error = rt->u.dst.error;
+                nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
                 nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
                 if (allfrag)
                         nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;