[NETNS]: Make the ctl-tables per-namespace

This includes passing the net to __addrconf_sysctl_register
and saving this on the ctl_table->extra2 to be used in
handlers (those, needing it).
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/addrconf.c

@@ -456,13 +456,13 @@ static void dev_forward_change(struct inet6_dev *idev)
 }
 
 
-static void addrconf_forward_change(void)
+static void addrconf_forward_change(struct net *net)
 {
 	struct net_device *dev;
 	struct inet6_dev *idev;
 
 	read_lock(&dev_base_lock);
-	for_each_netdev(&init_net, dev) {
+	for_each_netdev(net, dev) {
 		rcu_read_lock();
 		idev = __in6_dev_get(dev);
 		if (idev) {
@@ -478,12 +478,15 @@ static void addrconf_forward_change(void)
 
 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 {
+	struct net *net;
+
+	net = (struct net *)table->extra2;
 	if (p == &ipv6_devconf_dflt.forwarding)
 		return;
 
 	if (p == &ipv6_devconf.forwarding) {
 		ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
-		addrconf_forward_change();
+		addrconf_forward_change(net);
 	} else if ((!*p) ^ (!old))
 		dev_forward_change((struct inet6_dev *)table->extra1);
 
@@ -4044,8 +4047,8 @@ static struct addrconf_sysctl_table
 	},
 };
 
-static int __addrconf_sysctl_register(char *dev_name, int ctl_name,
-		struct inet6_dev *idev, struct ipv6_devconf *p)
+static int __addrconf_sysctl_register(struct net *net, char *dev_name,
+		int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
 {
 	int i;
 	struct addrconf_sysctl_table *t;
@@ -4068,6 +4071,7 @@ static int __addrconf_sysctl_register(char *dev_name, int ctl_name,
 	for (i=0; t->addrconf_vars[i].data; i++) {
 		t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
 		t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
+		t->addrconf_vars[i].extra2 = net;
 	}
 
 	/*
@@ -4082,7 +4086,7 @@ static int __addrconf_sysctl_register(char *dev_name, int ctl_name,
 	addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
 	addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
 
-	t->sysctl_header = register_sysctl_paths(addrconf_ctl_path,
+	t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
 			t->addrconf_vars);
 	if (t->sysctl_header == NULL)
 		goto free_procname;
@@ -4118,8 +4122,8 @@ static void addrconf_sysctl_register(struct inet6_dev *idev)
 			      NET_IPV6_NEIGH, "ipv6",
 			      &ndisc_ifinfo_sysctl_change,
 			      NULL);
-	__addrconf_sysctl_register(idev->dev->name, idev->dev->ifindex,
-			idev, &idev->cnf);
+	__addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
+			idev->dev->ifindex, idev, &idev->cnf);
 }
 
 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
@@ -4215,9 +4219,9 @@ int __init addrconf_init(void)
 	ipv6_addr_label_rtnl_register();
 
 #ifdef CONFIG_SYSCTL
-	__addrconf_sysctl_register("all", NET_PROTO_CONF_ALL,
+	__addrconf_sysctl_register(&init_net, "all", NET_PROTO_CONF_ALL,
 			NULL, &ipv6_devconf);
-	__addrconf_sysctl_register("default", NET_PROTO_CONF_DEFAULT,
+	__addrconf_sysctl_register(&init_net, "default", NET_PROTO_CONF_DEFAULT,
 			NULL, &ipv6_devconf_dflt);
 #endif