[IPV6]: Unify and cleanup calls to addrconf_sysctl_register

Currently this call is (ab)used similar to devinet one - it
registers sysctls for devices and for the "default" confs, while
the "all" sysctls are registered separately. But unlike its
devinet brother, the passed inet6_device is needed.

The fix is to make a __addrconf_sysctl_register(), which registers
sysctls for all "devices" we need, including "default" and "all" :)

The original addrconf_sysctl_register() calls the introduced
function, passing the inet6_device, device name and ifindex (to
be used as procname and ctl_name) into it.

Thanks to Herbert again for pointing out, that we can shrink the
argument list to 1 :)
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/addrconf.c

@@ -101,7 +101,7 @@
 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 
 #ifdef CONFIG_SYSCTL
-static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
+static void addrconf_sysctl_register(struct inet6_dev *idev);
 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 #endif
 
@@ -400,7 +400,7 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 			      NET_IPV6_NEIGH, "ipv6",
 			      &ndisc_ifinfo_sysctl_change,
 			      NULL);
-	addrconf_sysctl_register(ndev, &ndev->cnf);
+	addrconf_sysctl_register(ndev);
 #endif
 	/* protected by rtnl_lock */
 	rcu_assign_pointer(dev->ip6_ptr, ndev);
@@ -2386,7 +2386,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
 					      NET_IPV6, NET_IPV6_NEIGH, "ipv6",
 					      &ndisc_ifinfo_sysctl_change,
 					      NULL);
-			addrconf_sysctl_register(idev, &idev->cnf);
+			addrconf_sysctl_register(idev);
 #endif
 			err = snmp6_register_dev(idev);
 			if (err)
@@ -4118,12 +4118,11 @@ static struct addrconf_sysctl_table
 	},
 };
 
-static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
+static void __addrconf_sysctl_register(char *dev_name, int ctl_name,
+		struct inet6_dev *idev, struct ipv6_devconf *p)
 {
 	int i;
-	struct net_device *dev = idev ? idev->dev : NULL;
 	struct addrconf_sysctl_table *t;
-	char *dev_name = NULL;
 
 	t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
 	if (t == NULL)
@@ -4133,13 +4132,6 @@ static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf
 		t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
 		t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
 	}
-	if (dev) {
-		dev_name = dev->name;
-		t->addrconf_dev[0].ctl_name = dev->ifindex;
-	} else {
-		dev_name = "default";
-		t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
-	}
 
 	/*
 	 * Make a copy of dev_name, because '.procname' is regarded as const
@@ -4150,6 +4142,7 @@ static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf
 	if (!dev_name)
 		goto free;
 
+	t->addrconf_dev[0].ctl_name = ctl_name;
 	t->addrconf_dev[0].procname = dev_name;
 
 	t->addrconf_dev[0].child = t->addrconf_vars;
@@ -4172,6 +4165,12 @@ static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf
 	return;
 }
 
+static void addrconf_sysctl_register(struct inet6_dev *idev)
+{
+	__addrconf_sysctl_register(idev->dev->name, idev->dev->ifindex,
+			idev, &idev->cnf);
+}
+
 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
 {
 	if (p->sysctl) {
@@ -4270,9 +4269,10 @@ int __init addrconf_init(void)
 	ipv6_addr_label_rtnl_register();
 
 #ifdef CONFIG_SYSCTL
-	addrconf_sysctl.sysctl_header =
-		register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
-	addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
+	__addrconf_sysctl_register("all", NET_PROTO_CONF_ALL,
+			NULL, &ipv6_devconf);
+	__addrconf_sysctl_register("default", NET_PROTO_CONF_DEFAULT,
+			NULL, &ipv6_devconf_dflt);
 #endif
 
 	return 0;