[SIT]: Make tunnels hashes per-net.

Just move all the hashes on the sit_net structure and
patch the rest of the code appropriately.

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

1 files changed, 25 insertions, 20 deletions

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index d0c1f2db7f21..f82494bc4c58 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -70,15 +70,15 @@ static void ipip6_tunnel_setup(struct net_device *dev);
 
 static int sit_net_id;
 struct sit_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;
 };
 
-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(ipip6_lock);
 
 static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net,
@@ -87,21 +87,22 @@ static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net,
         unsigned h0 = HASH(remote);
         unsigned h1 = HASH(local);
         struct ip_tunnel *t;
+        struct sit_net *sitn = net_generic(net, sit_net_id);
 
-        for (t = tunnels_r_l[h0^h1]; t; t = t->next) {
+        for (t = sitn->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 = sitn->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 = sitn->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 = sitn->tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP))
                 return t;
         return NULL;
 }
@@ -122,7 +123,7 @@ static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn,
                 prio |= 1;
                 h ^= HASH(local);
         }
-        return &tunnels[prio][h];
+        return &sitn->tunnels[prio][h];
 }
 
 static inline struct ip_tunnel **ipip6_bucket(struct sit_net *sitn,
@@ -387,7 +388,7 @@ static void ipip6_tunnel_uninit(struct net_device *dev)
 
         if (dev == sitn->fb_tunnel_dev) {
                 write_lock_bh(&ipip6_lock);
-                tunnels_wc[0] = NULL;
+                sitn->tunnels_wc[0] = NULL;
                 write_unlock_bh(&ipip6_lock);
                 dev_put(dev);
         } else {
@@ -1050,6 +1051,8 @@ static int ipip6_fb_tunnel_init(struct net_device *dev)
 {
         struct ip_tunnel *tunnel = netdev_priv(dev);
         struct iphdr *iph = &tunnel->parms.iph;
+        struct net *net = dev_net(dev);
+        struct sit_net *sitn = net_generic(net, sit_net_id);
 
         tunnel->dev = dev;
         strcpy(tunnel->parms.name, dev->name);
@@ -1060,7 +1063,7 @@ static int ipip6_fb_tunnel_init(struct net_device *dev)
         iph->ttl                = 64;
 
         dev_hold(dev);
-        tunnels_wc[0]           = tunnel;
+        sitn->tunnels_wc[0]     = tunnel;
         return 0;
 }
 
@@ -1070,7 +1073,7 @@ static struct xfrm_tunnel sit_handler = {
         .priority       =       1,
 };
 
-static void __exit sit_destroy_tunnels(void)
+static void sit_destroy_tunnels(struct sit_net *sitn)
 {
         int prio;
 
@@ -1078,7 +1081,7 @@ static void __exit sit_destroy_tunnels(void)
                 int h;
                 for (h = 0; h < HASH_SIZE; h++) {
                         struct ip_tunnel *t;
-                        while ((t = tunnels[prio][h]) != NULL)
+                        while ((t = sitn->tunnels[prio][h]) != NULL)
                                 unregister_netdevice(t->dev);
                 }
         }
@@ -1090,7 +1093,7 @@ static int sit_init_net(struct net *net)
         struct sit_net *sitn;
 
         err = -ENOMEM;
-        sitn = kmalloc(sizeof(struct sit_net), GFP_KERNEL);
+        sitn = kzalloc(sizeof(struct sit_net), GFP_KERNEL);
         if (sitn == NULL)
                 goto err_alloc;
 
@@ -1098,6 +1101,11 @@ static int sit_init_net(struct net *net)
         if (err < 0)
                 goto err_assign;
 
+        sitn->tunnels[0] = sitn->tunnels_wc;
+        sitn->tunnels[1] = sitn->tunnels_l;
+        sitn->tunnels[2] = sitn->tunnels_r;
+        sitn->tunnels[3] = sitn->tunnels_r_l;
+
         sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
                                            ipip6_tunnel_setup);
         if (!sitn->fb_tunnel_dev) {
@@ -1129,6 +1137,7 @@ static void sit_exit_net(struct net *net)
 
         sitn = net_generic(net, sit_net_id);
         rtnl_lock();
+        sit_destroy_tunnels(sitn);
         unregister_netdevice(sitn->fb_tunnel_dev);
         rtnl_unlock();
         kfree(sitn);
@@ -1143,10 +1152,6 @@ static void __exit sit_cleanup(void)
 {
         xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
 
-        rtnl_lock();
-        sit_destroy_tunnels();
-        rtnl_unlock();
-
         unregister_pernet_gen_device(sit_net_id, &sit_net_ops);
 }