[NETNS]: Clean out the ipv6-related sysctls creation/destruction

The addrconf sysctls and neigh sysctls are registered and
unregistered always in pairs, so they can be joined into
one (well, two) functions, that accept the struct inet6_dev
and do all the job.

This also get rids of unneeded ifdefs inside the code.

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

1 files changed, 34 insertions, 29 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 6a48bb88f46..27b35ddeeab 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -102,7 +102,15 @@
 
 #ifdef CONFIG_SYSCTL
 static void addrconf_sysctl_register(struct inet6_dev *idev);
-static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
+static void addrconf_sysctl_unregister(struct inet6_dev *idev);
+#else
+static inline void addrconf_sysctl_register(struct inet6_dev *idev)
+{
+}
+
+static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
+{
+}
 #endif
 
 #ifdef CONFIG_IPV6_PRIVACY
@@ -392,13 +400,7 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 
         ipv6_mc_init_dev(ndev);
         ndev->tstamp = jiffies;
-#ifdef CONFIG_SYSCTL
-        neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
-                              NET_IPV6_NEIGH, "ipv6",
-                              &ndisc_ifinfo_sysctl_change,
-                              NULL);
         addrconf_sysctl_register(ndev);
-#endif
         /* protected by rtnl_lock */
         rcu_assign_pointer(dev->ip6_ptr, ndev);
 
@@ -2391,15 +2393,8 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
         case NETDEV_CHANGENAME:
                 if (idev) {
                         snmp6_unregister_dev(idev);
-#ifdef CONFIG_SYSCTL
-                        addrconf_sysctl_unregister(&idev->cnf);
-                        neigh_sysctl_unregister(idev->nd_parms);
-                        neigh_sysctl_register(dev, idev->nd_parms,
-                                              NET_IPV6, NET_IPV6_NEIGH, "ipv6",
-                                              &ndisc_ifinfo_sysctl_change,
-                                              NULL);
+                        addrconf_sysctl_unregister(idev);
                         addrconf_sysctl_register(idev);
-#endif
                         err = snmp6_register_dev(idev);
                         if (err)
                                 return notifier_from_errno(err);
@@ -2523,10 +2518,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
         /* Shot the device (if unregistered) */
 
         if (how == 1) {
-#ifdef CONFIG_SYSCTL
-                addrconf_sysctl_unregister(&idev->cnf);
-                neigh_sysctl_unregister(idev->nd_parms);
-#endif
+                addrconf_sysctl_unregister(idev);
                 neigh_parms_release(&nd_tbl, idev->nd_parms);
                 neigh_ifdown(&nd_tbl, dev);
                 in6_dev_put(idev);
@@ -4106,21 +4098,34 @@ out:
         return;
 }
 
+static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
+{
+        struct addrconf_sysctl_table *t;
+
+        if (p->sysctl == NULL)
+                return;
+
+        t = p->sysctl;
+        p->sysctl = NULL;
+        unregister_sysctl_table(t->sysctl_header);
+        kfree(t->dev_name);
+        kfree(t);
+}
+
 static void addrconf_sysctl_register(struct inet6_dev *idev)
 {
+        neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
+                              NET_IPV6_NEIGH, "ipv6",
+                              &ndisc_ifinfo_sysctl_change,
+                              NULL);
         __addrconf_sysctl_register(idev->dev->name, idev->dev->ifindex,
                         idev, &idev->cnf);
 }
 
-static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
+static void addrconf_sysctl_unregister(struct inet6_dev *idev)
 {
-        if (p->sysctl) {
-                struct addrconf_sysctl_table *t = p->sysctl;
-                p->sysctl = NULL;
-                unregister_sysctl_table(t->sysctl_header);
-                kfree(t->dev_name);
-                kfree(t);
-        }
+        __addrconf_sysctl_unregister(&idev->cnf);
+        neigh_sysctl_unregister(idev->nd_parms);
 }
 
 
@@ -4232,8 +4237,8 @@ void addrconf_cleanup(void)
         unregister_netdevice_notifier(&ipv6_dev_notf);
 
 #ifdef CONFIG_SYSCTL
-        addrconf_sysctl_unregister(&ipv6_devconf_dflt);
-        addrconf_sysctl_unregister(&ipv6_devconf);
+        __addrconf_sysctl_unregister(&ipv6_devconf_dflt);
+        __addrconf_sysctl_unregister(&ipv6_devconf);
 #endif
 
         rtnl_lock();