[NETFILTER]: Use the ctl paths instead of hand-made analogue

The conntracks subsystem has a similar infrastructure
to maintain ctl_paths, but since we already have it
on the generic level, I think it's OK to switch to
using it.

So, basically, this patch just replaces the ctl_table-s
with ctl_path-s, nf_register_sysctl_table with
register_sysctl_paths() and removes no longer needed code.

After this the net/netfilter/nf_sysctl.c file contains
the paths only.

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

2 files changed, 13 insertions, 121 deletions

diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
index 6d947068c58f..8595b5946acf 100644
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c
@@ -36,11 +36,11 @@ static DEFINE_MUTEX(nf_ct_proto_mutex);
 
 #ifdef CONFIG_SYSCTL
 static int
-nf_ct_register_sysctl(struct ctl_table_header **header, struct ctl_table *path,
+nf_ct_register_sysctl(struct ctl_table_header **header, struct ctl_path *path,
                       struct ctl_table *table, unsigned int *users)
 {
         if (*header == NULL) {
-                *header = nf_register_sysctl_table(path, table);
+                *header = register_sysctl_paths(path, table);
                 if (*header == NULL)
                         return -ENOMEM;
         }
@@ -55,7 +55,8 @@ nf_ct_unregister_sysctl(struct ctl_table_header **header,
 {
         if (users != NULL && --*users > 0)
                 return;
-        nf_unregister_sysctl_table(*header, table);
+
+        unregister_sysctl_table(*header);
         *header = NULL;
 }
 #endif
diff --git a/net/netfilter/nf_sysctl.c b/net/netfilter/nf_sysctl.c
index ee34589e48a4..d9fcc893301d 100644
--- a/net/netfilter/nf_sysctl.c
+++ b/net/netfilter/nf_sysctl.c
@@ -7,128 +7,19 @@
 #include <linux/string.h>
 #include <linux/slab.h>
 
-static void
-path_free(struct ctl_table *path, struct ctl_table *table)
-{
-        struct ctl_table *t, *next;
-
-        for (t = path; t != NULL && t != table; t = next) {
-                next = t->child;
-                kfree(t);
-        }
-}
-
-static struct ctl_table *
-path_dup(struct ctl_table *path, struct ctl_table *table)
-{
-        struct ctl_table *t, *last = NULL, *tmp;
-
-        for (t = path; t != NULL; t = t->child) {
-                /* twice the size since path elements are terminated by an
-                 * empty element */
-                tmp = kmemdup(t, 2 * sizeof(*t), GFP_KERNEL);
-                if (tmp == NULL) {
-                        if (last != NULL)
-                                path_free(path, table);
-                        return NULL;
-                }
-
-                if (last != NULL)
-                        last->child = tmp;
-                else
-                        path = tmp;
-                last = tmp;
-        }
-
-        if (last != NULL)
-                last->child = table;
-        else
-                path = table;
-
-        return path;
-}
-
-struct ctl_table_header *
-nf_register_sysctl_table(struct ctl_table *path, struct ctl_table *table)
-{
-        struct ctl_table_header *header;
-
-        path = path_dup(path, table);
-        if (path == NULL)
-                return NULL;
-        header = register_sysctl_table(path);
-        if (header == NULL)
-                path_free(path, table);
-        return header;
-}
-EXPORT_SYMBOL_GPL(nf_register_sysctl_table);
-
-void
-nf_unregister_sysctl_table(struct ctl_table_header *header,
-                           struct ctl_table *table)
-{
-        struct ctl_table *path = header->ctl_table;
-
-        unregister_sysctl_table(header);
-        path_free(path, table);
-}
-EXPORT_SYMBOL_GPL(nf_unregister_sysctl_table);
-
 /* net/netfilter */
-static struct ctl_table nf_net_netfilter_table[] = {
-        {
-                .ctl_name       = NET_NETFILTER,
-                .procname       = "netfilter",
-                .mode           = 0555,
-        },
-        {
-                .ctl_name       = 0
-        }
-};
-struct ctl_table nf_net_netfilter_sysctl_path[] = {
-        {
-                .ctl_name       = CTL_NET,
-                .procname       = "net",
-                .mode           = 0555,
-                .child          = nf_net_netfilter_table,
-        },
-        {
-                .ctl_name       = 0
-        }
+struct ctl_path nf_net_netfilter_sysctl_path[] = {
+        { .procname = "net", .ctl_name = CTL_NET, },
+        { .procname = "netfilter", .ctl_name = NET_NETFILTER, },
+        { }
 };
 EXPORT_SYMBOL_GPL(nf_net_netfilter_sysctl_path);
 
 /* net/ipv4/netfilter */
-static struct ctl_table nf_net_ipv4_netfilter_table[] = {
-        {
-                .ctl_name       = NET_IPV4_NETFILTER,
-                .procname       = "netfilter",
-                .mode           = 0555,
-        },
-        {
-                .ctl_name       = 0
-        }
-};
-static struct ctl_table nf_net_ipv4_table[] = {
-        {
-                .ctl_name       = NET_IPV4,
-                .procname       = "ipv4",
-                .mode           = 0555,
-                .child          = nf_net_ipv4_netfilter_table,
-        },
-        {
-                .ctl_name       = 0
-        }
-};
-struct ctl_table nf_net_ipv4_netfilter_sysctl_path[] = {
-        {
-                .ctl_name       = CTL_NET,
-                .procname       = "net",
-                .mode           = 0555,
-                .child          = nf_net_ipv4_table,
-        },
-        {
-                .ctl_name       = 0
-        }
+struct ctl_path nf_net_ipv4_netfilter_sysctl_path[] = {
+        { .procname = "net", .ctl_name = CTL_NET, },
+        { .procname = "ipv4", .ctl_name = NET_IPV4, },
+        { .procname = "netfilter", .ctl_name = NET_IPV4_NETFILTER, },
+        { }
 };
 EXPORT_SYMBOL_GPL(nf_net_ipv4_netfilter_sysctl_path);