[NETNS][IPV6] route6 - make route6 per namespace

This patch makes the routing engine use the network namespaces to
access routing informations: Add a network namespace parameter to
ipv6_route_ioctl and propagate the network namespace value to all the
routing code that have not yet been changed.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ip6_route.h

@@ -49,7 +49,9 @@ extern struct dst_entry *	ip6_route_output(struct sock *sk,
 extern int			ip6_route_init(void);
 extern void			ip6_route_cleanup(void);
 
-extern int			ipv6_route_ioctl(unsigned int cmd, void __user *arg);
+extern int			ipv6_route_ioctl(struct net *net,
+						 unsigned int cmd,
+						 void __user *arg);
 
 extern int			ip6_route_add(struct fib6_config *cfg);
 extern int			ip6_ins_rt(struct rt6_info *);

net/ipv6/af_inet6.c

@@ -440,6 +440,7 @@ EXPORT_SYMBOL(inet6_getname);
 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 {
 	struct sock *sk = sock->sk;
+	struct net *net = sk->sk_net;
 
 	switch(cmd)
 	{
@@ -452,7 +453,7 @@ int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 	case SIOCADDRT:
 	case SIOCDELRT:
 
-		return(ipv6_route_ioctl(cmd,(void __user *)arg));
+		return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
 
 	case SIOCSIFADDR:
 		return addrconf_add_ifaddr((void __user *) arg);