ipv6: Refactor common ip6gre_tunnel_init codes

It is a prep work to fix the dst_entry refcnt bugs in ip6_tunnel.

This patch refactors some common init codes used by both
ip6gre_tunnel_init and ip6gre_tap_init.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 24 insertions, 13 deletions

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 4038c694ec03..af60d46129c1 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -1245,7 +1245,7 @@ static void ip6gre_tunnel_setup(struct net_device *dev)
         netif_keep_dst(dev);
 }
 
-static int ip6gre_tunnel_init(struct net_device *dev)
+static int ip6gre_tunnel_init_common(struct net_device *dev)
 {
         struct ip6_tnl *tunnel;
 
@@ -1255,16 +1255,30 @@ static int ip6gre_tunnel_init(struct net_device *dev)
         tunnel->net = dev_net(dev);
         strcpy(tunnel->parms.name, dev->name);
 
+        dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+        if (!dev->tstats)
+                return -ENOMEM;
+
+        return 0;
+}
+
+static int ip6gre_tunnel_init(struct net_device *dev)
+{
+        struct ip6_tnl *tunnel;
+        int ret;
+
+        ret = ip6gre_tunnel_init_common(dev);
+        if (ret)
+                return ret;
+
+        tunnel = netdev_priv(dev);
+
         memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
         memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
 
         if (ipv6_addr_any(&tunnel->parms.raddr))
                 dev->header_ops = &ip6gre_header_ops;
 
-        dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
-        if (!dev->tstats)
-                return -ENOMEM;
-
         return 0;
 }
 
@@ -1460,19 +1474,16 @@ static void ip6gre_netlink_parms(struct nlattr *data[],
 static int ip6gre_tap_init(struct net_device *dev)
 {
         struct ip6_tnl *tunnel;
+        int ret;
 
-        tunnel = netdev_priv(dev);
+        ret = ip6gre_tunnel_init_common(dev);
+        if (ret)
+                return ret;
 
-        tunnel->dev = dev;
-        tunnel->net = dev_net(dev);
-        strcpy(tunnel->parms.name, dev->name);
+        tunnel = netdev_priv(dev);
 
         ip6gre_tnl_link_config(tunnel, 1);
 
-        dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
-        if (!dev->tstats)
-                return -ENOMEM;
-
         return 0;
 }