ipv6: Move common init code for rt6_info to a new function rt6_info_init()

Introduce rt6_info_init() to do the common init work for
'struct rt6_info' (after calling dst_alloc).

It is a prep work to fix the rt6_info init logic in the
ip6_blackhole_route().

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Julian Anastasov <ja@ssi.bg>
Cc: Phil Sutter <phil@nwl.cc>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 6 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index ed04e29a6aa3..4198017a5aa7 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -319,6 +319,15 @@ static const struct rt6_info ip6_blk_hole_entry_template = {
 
 #endif
 
+static void rt6_info_init(struct rt6_info *rt)
+{
+        struct dst_entry *dst = &rt->dst;
+
+        memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
+        INIT_LIST_HEAD(&rt->rt6i_siblings);
+        INIT_LIST_HEAD(&rt->rt6i_uncached);
+}
+
 /* allocate dst with ip6_dst_ops */
 static struct rt6_info *__ip6_dst_alloc(struct net *net,
                                         struct net_device *dev,
@@ -327,13 +336,9 @@ static struct rt6_info *__ip6_dst_alloc(struct net *net,
         struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
                                         0, DST_OBSOLETE_FORCE_CHK, flags);
 
-        if (rt) {
-                struct dst_entry *dst = &rt->dst;
+        if (rt)
+                rt6_info_init(rt);
 
-                memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
-                INIT_LIST_HEAD(&rt->rt6i_siblings);
-                INIT_LIST_HEAD(&rt->rt6i_uncached);
-        }
         return rt;
 }