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authorRusty Russell <rusty@rustcorp.com.au>2008-07-03 03:46:16 -0700
committerDavid S. Miller <davem@davemloft.net>2008-07-03 03:46:16 -0700
commit5228ddc98fa49b3cedab4024e269d62410a0d806 (patch)
tree0d3cceeac55ec09b0fa593666bc03373954b3d9a /drivers/net/tun.c
parent07240fd0902c872f044f523893364a1a24c9f278 (diff)
tun: TUNSETFEATURES to set gso features.
ethtool is useful for setting (some) device fields, but it's root-only. Finer feature control is available through a tun-specific ioctl. (Includes Mark McLoughlin <markmc@redhat.com>'s fix to hold rtnl sem). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Max Krasnyansky <maxk@qualcomm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 3bb991fd2b5..a314955e699 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -611,6 +611,46 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
return err;
}
+/* This is like a cut-down ethtool ops, except done via tun fd so no
+ * privs required. */
+static int set_offload(struct net_device *dev, unsigned long arg)
+{
+ unsigned int old_features, features;
+
+ old_features = dev->features;
+ /* Unset features, set them as we chew on the arg. */
+ features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST
+ |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6));
+
+ if (arg & TUN_F_CSUM) {
+ features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
+ arg &= ~TUN_F_CSUM;
+
+ if (arg & (TUN_F_TSO4|TUN_F_TSO6)) {
+ if (arg & TUN_F_TSO_ECN) {
+ features |= NETIF_F_TSO_ECN;
+ arg &= ~TUN_F_TSO_ECN;
+ }
+ if (arg & TUN_F_TSO4)
+ features |= NETIF_F_TSO;
+ if (arg & TUN_F_TSO6)
+ features |= NETIF_F_TSO6;
+ arg &= ~(TUN_F_TSO4|TUN_F_TSO6);
+ }
+ }
+
+ /* This gives the user a way to test for new features in future by
+ * trying to set them. */
+ if (arg)
+ return -EINVAL;
+
+ dev->features = features;
+ if (old_features != dev->features)
+ netdev_features_change(dev);
+
+ return 0;
+}
+
static int tun_chr_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
@@ -715,6 +755,15 @@ static int tun_chr_ioctl(struct inode *inode, struct file *file,
break;
#endif
+ case TUNSETOFFLOAD:
+ {
+ int ret;
+ rtnl_lock();
+ ret = set_offload(tun->dev, arg);
+ rtnl_unlock();
+ return ret;
+ }
+
case SIOCGIFFLAGS:
ifr.ifr_flags = tun->if_flags;
if (copy_to_user( argp, &ifr, sizeof ifr))