[UNIX]: Make the unix sysctl tables per-namespace

This is the core.

 * add the ctl_table_header on the struct net;
 * make the unix_sysctl_register and _unregister clone the table;
 * moves calls to them into per-net init and exit callbacks;
 * move the .data pointer in the proper place.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index b0cf075..f97b2a4 100644 (file)
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -11,6 +11,8 @@
 struct proc_dir_entry;
 struct net_device;
 struct sock;
+struct ctl_table_header;
+
 struct net {
        atomic_t                count;          /* To decided when the network
                                                 *  namespace should be freed.
@@ -41,6 +43,7 @@ struct net {
 
        /* unix sockets */
        int                     sysctl_unix_max_dgram_qlen;
+       struct ctl_table_header *unix_ctl;
 };
 
 #ifdef CONFIG_NET

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 73620d6..b8a2189 100644 (file)
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -2139,10 +2139,14 @@ static int unix_net_init(struct net *net)
        int error = -ENOMEM;
 
        net->sysctl_unix_max_dgram_qlen = 10;
+       if (unix_sysctl_register(net))
+               goto out;
 
 #ifdef CONFIG_PROC_FS
-       if (!proc_net_fops_create(net, "unix", 0, &unix_seq_fops))
+       if (!proc_net_fops_create(net, "unix", 0, &unix_seq_fops)) {
+               unix_sysctl_unregister(net);
                goto out;
+       }
 #endif
        error = 0;
 out:
@@ -2151,6 +2155,7 @@ out:
 
 static void unix_net_exit(struct net *net)
 {
+       unix_sysctl_unregister(net);
        proc_net_remove(net, "unix");
 }
 
@@ -2175,7 +2180,6 @@ static int __init af_unix_init(void)
 
        sock_register(&unix_family_ops);
        register_pernet_subsys(&unix_net_ops);
-       unix_sysctl_register(&init_net);
 out:
        return rc;
 }
@@ -2183,7 +2187,6 @@ out:
 static void __exit af_unix_exit(void)
 {
        sock_unregister(PF_UNIX);
-       unix_sysctl_unregister(&init_net);
        proto_unregister(&unix_proto);
        unregister_pernet_subsys(&unix_net_ops);
 }

diff --git a/net/unix/sysctl_net_unix.c b/net/unix/sysctl_net_unix.c
index 43dd356..553ef6a 100644 (file)
--- a/net/unix/sysctl_net_unix.c
+++ b/net/unix/sysctl_net_unix.c
@@ -32,16 +32,33 @@ static struct ctl_path unix_path[] = {
        { },
 };
 
-static struct ctl_table_header * unix_sysctl_header;
-
 int unix_sysctl_register(struct net *net)
 {
-       unix_sysctl_header = register_sysctl_paths(unix_path, unix_table);
-       return unix_sysctl_header == NULL ? -ENOMEM : 0;
+       struct ctl_table *table;
+
+       table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL);
+       if (table == NULL)
+               goto err_alloc;
+
+       table[0].data = &net->sysctl_unix_max_dgram_qlen;
+       net->unix_ctl = register_net_sysctl_table(net, unix_path, table);
+       if (net->unix_ctl == NULL)
+               goto err_reg;
+
+       return 0;
+
+err_reg:
+       kfree(table);
+err_alloc:
+       return -ENOMEM;
 }
 
 void unix_sysctl_unregister(struct net *net)
 {
-       unregister_sysctl_table(unix_sysctl_header);
+       struct ctl_table *table;
+
+       table = net->unix_ctl->ctl_table_arg;
+       unregister_sysctl_table(net->unix_ctl);
+       kfree(table);
 }