sit: use the right netns in ioctl handler

Because the netdevice may be in another netns than the i/o netns, we should
use the i/o netns instead of dev_net(dev).

Note that netdev_priv(dev) cannot bu NULL, hence we can remove these useless
checks.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 8da8268..e5a453c 100644 (file)
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1127,8 +1127,8 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
        int err = 0;
        struct ip_tunnel_parm p;
        struct ip_tunnel_prl prl;
-       struct ip_tunnel *t;
-       struct net *net = dev_net(dev);
+       struct ip_tunnel *t = netdev_priv(dev);
+       struct net *net = t->net;
        struct sit_net *sitn = net_generic(net, sit_net_id);
 #ifdef CONFIG_IPV6_SIT_6RD
        struct ip_tunnel_6rd ip6rd;
@@ -1139,16 +1139,15 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
 #ifdef CONFIG_IPV6_SIT_6RD
        case SIOCGET6RD:
 #endif
-               t = NULL;
                if (dev == sitn->fb_tunnel_dev) {
                        if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
                                err = -EFAULT;
                                break;
                        }
                        t = ipip6_tunnel_locate(net, &p, 0);
+                       if (t == NULL)
+                               t = netdev_priv(dev);
                }
-               if (t == NULL)
-                       t = netdev_priv(dev);
 
                err = -EFAULT;
                if (cmd == SIOCGETTUNNEL) {
@@ -1244,9 +1243,6 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
                err = -EINVAL;
                if (dev == sitn->fb_tunnel_dev)
                        goto done;
-               err = -ENOENT;
-               if (!(t = netdev_priv(dev)))
-                       goto done;
                err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
                break;
 
@@ -1262,9 +1258,6 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
                err = -EFAULT;
                if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
                        goto done;
-               err = -ENOENT;
-               if (!(t = netdev_priv(dev)))
-                       goto done;
 
                switch (cmd) {
                case SIOCDELPRL:
@@ -1292,8 +1285,6 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
                                   sizeof(ip6rd)))
                        goto done;
 
-               t = netdev_priv(dev);
-
                if (cmd != SIOCDEL6RD) {
                        err = ipip6_tunnel_update_6rd(t, &ip6rd);
                        if (err < 0)