sctp: Add infrastructure for per net sysctls

Start with an empty sctp_net_table that will be populated as the various
tunable sysctls are made per net.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 28 insertions, 0 deletions

diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index d58db315db85..0f2342be61f3 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -1169,6 +1169,10 @@ static int sctp_net_init(struct net *net)
 {
         int status;
 
+        status = sctp_sysctl_net_register(net);
+        if (status)
+                goto err_sysctl_register;
+
         /* Allocate and initialise sctp mibs.  */
         status = init_sctp_mibs(net);
         if (status)
@@ -1208,6 +1212,8 @@ err_ctl_sock_init:
 err_init_proc:
         cleanup_sctp_mibs(net);
 err_init_mibs:
+        sctp_sysctl_net_unregister(net);
+err_sysctl_register:
         return status;
 }
 
@@ -1224,6 +1230,7 @@ static void sctp_net_exit(struct net *net)
 
         sctp_proc_exit(net);
         cleanup_sctp_mibs(net);
+        sctp_sysctl_net_unregister(net);
 }
 
 static struct pernet_operations sctp_net_ops = {
diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index 2b2bfe933ff1..bee36c408dde 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -284,6 +284,27 @@ static ctl_table sctp_table[] = {
         { /* sentinel */ }
 };
 
+static ctl_table sctp_net_table[] = {
+        { /* sentinel */ }
+};
+
+int sctp_sysctl_net_register(struct net *net)
+{
+        struct ctl_table *table;
+
+        table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
+        if (!table)
+                return -ENOMEM;
+
+        net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
+        return 0;
+}
+
+void sctp_sysctl_net_unregister(struct net *net)
+{
+        unregister_net_sysctl_table(net->sctp.sysctl_header);
+}
+
 static struct ctl_table_header * sctp_sysctl_header;
 
 /* Sysctl registration.  */