[IPIP]: Make tunnels hashes per net.

Either net or ipip_net already exists in all the required 
places, so just use one.

Besides, tune net_init and net_exit calls to respectively 
initialize the hashes and destroy devices.

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

1 files changed, 36 insertions, 32 deletions

diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index da7147090a19..9c2939ba7b94 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -123,6 +123,12 @@
 
 static int ipip_net_id;
 struct ipip_net {
+        struct ip_tunnel *tunnels_r_l[HASH_SIZE];
+        struct ip_tunnel *tunnels_r[HASH_SIZE];
+        struct ip_tunnel *tunnels_l[HASH_SIZE];
+        struct ip_tunnel *tunnels_wc[1];
+        struct ip_tunnel **tunnels[4];
+
         struct net_device *fb_tunnel_dev;
 };
 
@@ -130,12 +136,6 @@ static int ipip_fb_tunnel_init(struct net_device *dev);
 static int ipip_tunnel_init(struct net_device *dev);
 static void ipip_tunnel_setup(struct net_device *dev);
 
-static struct ip_tunnel *tunnels_r_l[HASH_SIZE];
-static struct ip_tunnel *tunnels_r[HASH_SIZE];
-static struct ip_tunnel *tunnels_l[HASH_SIZE];
-static struct ip_tunnel *tunnels_wc[1];
-static struct ip_tunnel **tunnels[4] = { tunnels_wc, tunnels_l, tunnels_r, tunnels_r_l };
-
 static DEFINE_RWLOCK(ipip_lock);
 
 static struct ip_tunnel * ipip_tunnel_lookup(struct net *net,
@@ -144,21 +144,22 @@ static struct ip_tunnel * ipip_tunnel_lookup(struct net *net,
         unsigned h0 = HASH(remote);
         unsigned h1 = HASH(local);
         struct ip_tunnel *t;
+        struct ipip_net *ipn = net_generic(net, ipip_net_id);
 
-        for (t = tunnels_r_l[h0^h1]; t; t = t->next) {
+        for (t = ipn->tunnels_r_l[h0^h1]; t; t = t->next) {
                 if (local == t->parms.iph.saddr &&
                     remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
                         return t;
         }
-        for (t = tunnels_r[h0]; t; t = t->next) {
+        for (t = ipn->tunnels_r[h0]; t; t = t->next) {
                 if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
                         return t;
         }
-        for (t = tunnels_l[h1]; t; t = t->next) {
+        for (t = ipn->tunnels_l[h1]; t; t = t->next) {
                 if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
                         return t;
         }
-        if ((t = tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP))
+        if ((t = ipn->tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP))
                 return t;
         return NULL;
 }
@@ -179,7 +180,7 @@ static struct ip_tunnel **__ipip_bucket(struct ipip_net *ipn,
                 prio |= 1;
                 h ^= HASH(local);
         }
-        return &tunnels[prio][h];
+        return &ipn->tunnels[prio][h];
 }
 
 static inline struct ip_tunnel **ipip_bucket(struct ipip_net *ipn,
@@ -266,7 +267,7 @@ static void ipip_tunnel_uninit(struct net_device *dev)
 
         if (dev == ipn->fb_tunnel_dev) {
                 write_lock_bh(&ipip_lock);
-                tunnels_wc[0] = NULL;
+                ipn->tunnels_wc[0] = NULL;
                 write_unlock_bh(&ipip_lock);
         } else
                 ipip_tunnel_unlink(ipn, netdev_priv(dev));
@@ -861,6 +862,7 @@ static int ipip_fb_tunnel_init(struct net_device *dev)
 {
         struct ip_tunnel *tunnel = netdev_priv(dev);
         struct iphdr *iph = &tunnel->parms.iph;
+        struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id);
 
         tunnel->dev = dev;
         strcpy(tunnel->parms.name, dev->name);
@@ -870,7 +872,7 @@ static int ipip_fb_tunnel_init(struct net_device *dev)
         iph->ihl                = 5;
 
         dev_hold(dev);
-        tunnels_wc[0]           = tunnel;
+        ipn->tunnels_wc[0]      = tunnel;
         return 0;
 }
 
@@ -883,13 +885,27 @@ static struct xfrm_tunnel ipip_handler = {
 static char banner[] __initdata =
         KERN_INFO "IPv4 over IPv4 tunneling driver\n";
 
+static void ipip_destroy_tunnels(struct ipip_net *ipn)
+{
+        int prio;
+
+        for (prio = 1; prio < 4; prio++) {
+                int h;
+                for (h = 0; h < HASH_SIZE; h++) {
+                        struct ip_tunnel *t;
+                        while ((t = ipn->tunnels[prio][h]) != NULL)
+                                unregister_netdevice(t->dev);
+                }
+        }
+}
+
 static int ipip_init_net(struct net *net)
 {
         int err;
         struct ipip_net *ipn;
 
         err = -ENOMEM;
-        ipn = kmalloc(sizeof(struct ipip_net), GFP_KERNEL);
+        ipn = kzalloc(sizeof(struct ipip_net), GFP_KERNEL);
         if (ipn == NULL)
                 goto err_alloc;
 
@@ -897,6 +913,11 @@ static int ipip_init_net(struct net *net)
         if (err < 0)
                 goto err_assign;
 
+        ipn->tunnels[0] = ipn->tunnels_wc;
+        ipn->tunnels[1] = ipn->tunnels_l;
+        ipn->tunnels[2] = ipn->tunnels_r;
+        ipn->tunnels[3] = ipn->tunnels_r_l;
+
         ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel),
                                            "tunl0",
                                            ipip_tunnel_setup);
@@ -929,6 +950,7 @@ static void ipip_exit_net(struct net *net)
 
         ipn = net_generic(net, ipip_net_id);
         rtnl_lock();
+        ipip_destroy_tunnels(ipn);
         unregister_netdevice(ipn->fb_tunnel_dev);
         rtnl_unlock();
         kfree(ipn);
@@ -957,29 +979,11 @@ static int __init ipip_init(void)
         return err;
 }
 
-static void __exit ipip_destroy_tunnels(void)
-{
-        int prio;
-
-        for (prio = 1; prio < 4; prio++) {
-                int h;
-                for (h = 0; h < HASH_SIZE; h++) {
-                        struct ip_tunnel *t;
-                        while ((t = tunnels[prio][h]) != NULL)
-                                unregister_netdevice(t->dev);
-                }
-        }
-}
-
 static void __exit ipip_fini(void)
 {
         if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
                 printk(KERN_INFO "ipip close: can't deregister tunnel\n");
 
-        rtnl_lock();
-        ipip_destroy_tunnels();
-        rtnl_unlock();
-
         unregister_pernet_gen_device(ipip_net_id, &ipip_net_ops);
 }