[RFC PATCH 06/11] ip/route: factor out helper for local route creation

[Paolo Abeni]

Will be used by a later patch to build the ifaddr dst cache.
No functional changes are introduced here.

Signed-off-by: Paolo Abeni <pab...@redhat.com>
---
 include/net/route.h |  2 ++
 net/ipv4/route.c    | 30 ++++++++++++++++++++++--------
 2 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/include/net/route.h b/include/net/route.h
index 1b09a9368c68..ec09c3d73581 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -176,6 +176,8 @@ static inline struct rtable *ip_route_output_gre(struct net 
*net, struct flowi4
        return ip_route_output_key(net, fl4);
 }
 
+struct rtable *ip_local_route_alloc(struct net_device *dev, unsigned int flags,
+                                   u32 itag, unsigned char type, bool docache);
 int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
                         u8 tos, struct net_device *devin);
 int ip_route_input_rcu(struct sk_buff *skb, __be32 dst, __be32 src,
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 94d4cd2d5ea4..515589f1b3d1 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1859,6 +1859,27 @@ static int ip_mkroute_input(struct sk_buff *skb,
        return __mkroute_input(skb, res, in_dev, daddr, saddr, tos);
 }
 
+struct rtable *ip_local_route_alloc(struct net_device *dev, unsigned int flags,
+                                   u32 itag, unsigned char type, bool do_cache)
+{
+       struct in_device *in_dev = __in_dev_get_rcu(dev);
+       struct net *net = dev_net(dev);
+       struct rtable *rth;
+
+       rth = rt_dst_alloc(l3mdev_master_dev_rcu(dev) ? : net->loopback_dev,
+                          flags | RTCF_LOCAL, type,
+                          IN_DEV_CONF_GET(in_dev, NOPOLICY), false, do_cache);
+       if (!rth)
+               return NULL;
+
+       rth->dst.output= ip_rt_bug;
+#ifdef CONFIG_IP_ROUTE_CLASSID
+       rth->dst.tclassid = itag;
+#endif
+       rth->rt_is_input = 1;
+       return rth;
+}
+
 /*
  *     NOTE. We drop all the packets that has local source
  *     addresses, because every properly looped back packet
@@ -1996,17 +2017,10 @@ out:    return err;
                }
        }
 
-       rth = rt_dst_alloc(l3mdev_master_dev_rcu(dev) ? : net->loopback_dev,
-                          flags | RTCF_LOCAL, res->type,
-                          IN_DEV_CONF_GET(in_dev, NOPOLICY), false, do_cache);
+       rth = ip_local_route_alloc(dev, flags, itag, res->type, do_cache);
        if (!rth)
                goto e_nobufs;
 
-       rth->dst.output= ip_rt_bug;
-#ifdef CONFIG_IP_ROUTE_CLASSID
-       rth->dst.tclassid = itag;
-#endif
-       rth->rt_is_input = 1;
        if (res->table)
                rth->rt_table_id = res->table->tb_id;
 
-- 
2.13.5