[GRE]: Introduce empty ipgre_net structure and net init/exit ops.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 49 insertions, 0 deletions

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 50972b397a9a..d729ca820931 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -39,6 +39,8 @@
 #include <net/dsfield.h>
 #include <net/inet_ecn.h>
 #include <net/xfrm.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
 
 #ifdef CONFIG_IPV6
 #include <net/ipv6.h>
@@ -122,6 +124,10 @@ static void ipgre_tunnel_setup(struct net_device *dev);
 
 static int ipgre_fb_tunnel_init(struct net_device *dev);
 
+static int ipgre_net_id;
+struct ipgre_net {
+};
+
 static struct net_device *ipgre_fb_tunnel_dev;
 
 /* Tunnel hash table */
@@ -1275,6 +1281,40 @@ static struct net_protocol ipgre_protocol = {
         .err_handler    =       ipgre_err,
 };
 
+static int ipgre_init_net(struct net *net)
+{
+        int err;
+        struct ipgre_net *ign;
+
+        err = -ENOMEM;
+        ign = kmalloc(sizeof(struct ipgre_net), GFP_KERNEL);
+        if (ign == NULL)
+                goto err_alloc;
+
+        err = net_assign_generic(net, ipgre_net_id, ign);
+        if (err < 0)
+                goto err_assign;
+
+        return 0;
+
+err_assign:
+        kfree(ign);
+err_alloc:
+        return err;
+}
+
+static void ipgre_exit_net(struct net *net)
+{
+        struct ipgre_net *ign;
+
+        ign = net_generic(net, ipgre_net_id);
+        kfree(ign);
+}
+
+static struct pernet_operations ipgre_net_ops = {
+        .init = ipgre_init_net,
+        .exit = ipgre_exit_net,
+};
 
 /*
  *      And now the modules code and kernel interface.
@@ -1302,6 +1342,10 @@ static int __init ipgre_init(void)
 
         if ((err = register_netdev(ipgre_fb_tunnel_dev)))
                 goto err2;
+
+        err = register_pernet_gen_device(&ipgre_net_id, &ipgre_net_ops);
+        if (err < 0)
+                goto err3;
 out:
         return err;
 err2:
@@ -1309,6 +1353,9 @@ err2:
 err1:
         inet_del_protocol(&ipgre_protocol, IPPROTO_GRE);
         goto out;
+err3:
+        unregister_netdevice(ipgre_fb_tunnel_dev);
+        goto err1;
 }
 
 static void __exit ipgre_destroy_tunnels(void)
@@ -1333,6 +1380,8 @@ static void __exit ipgre_fini(void)
         rtnl_lock();
         ipgre_destroy_tunnels();
         rtnl_unlock();
+
+        unregister_pernet_gen_device(ipgre_net_id, &ipgre_net_ops);
 }
 
 module_init(ipgre_init);