[NETFILTER]: nf_conntrack: automatic sysctl registation for conntrack protocols

Add helper functions for sysctl registration with optional instantiating
of common path elements (like net/netfilter) and use it for support for
automatic registation of conntrack protocol sysctls.

Signed-off-by: Patrick McHardy <kaber@trash.net>

2 files changed, 12 insertions, 0 deletions

diff --git a/include/net/netfilter/nf_conntrack_l3proto.h b/include/net/netfilter/nf_conntrack_l3proto.h
index 6364df05942..664ddcffe00 100644
--- a/include/net/netfilter/nf_conntrack_l3proto.h
+++ b/include/net/netfilter/nf_conntrack_l3proto.h
@@ -75,6 +75,12 @@ struct nf_conntrack_l3proto
         int (*nfattr_to_tuple)(struct nfattr *tb[],
                                struct nf_conntrack_tuple *t);
 
+#ifdef CONFIG_SYSCTL
+        struct ctl_table_header *ctl_table_header;
+        struct ctl_table        *ctl_table_path;
+        struct ctl_table        *ctl_table;
+#endif /* CONFIG_SYSCTL */
+
         /* Module (if any) which this is connected to. */
         struct module *me;
 };
diff --git a/include/net/netfilter/nf_conntrack_l4proto.h b/include/net/netfilter/nf_conntrack_l4proto.h
index c22804aa227..fe1e8fa30d2 100644
--- a/include/net/netfilter/nf_conntrack_l4proto.h
+++ b/include/net/netfilter/nf_conntrack_l4proto.h
@@ -76,6 +76,12 @@ struct nf_conntrack_l4proto
         int (*nfattr_to_tuple)(struct nfattr *tb[],
                                struct nf_conntrack_tuple *t);
 
+#ifdef CONFIG_SYSCTL
+        struct ctl_table_header **ctl_table_header;
+        struct ctl_table        *ctl_table;
+        unsigned int            *ctl_table_users;
+#endif /* CONFIG_SYSCTL */
+
         /* Module (if any) which this is connected to. */
         struct module *me;
 };