This is Rusty's second patch to tun to allow user-space access
to the GSO feature in a backwards compatible way.
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 34a03ec..4c15dc4 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -800,6 +800,15 @@ static int tun_chr_ioctl(struct inode *inode, struct file *file,
return 0;
}
+ if (cmd == TUNGETFEATURES) {
+ /* Currently this just means: "what IFF flags are valid?".
+ * This is needed because we never checked for invalid flags on
+ * TUNSETIFF. This was introduced with IFF_GSO_HDR, so if a
+ * kernel doesn't have this ioctl, it doesn't have GSO header
+ * support. */
+ return put_user(IFF_ALL_FLAGS, (unsigned int __user*)argp);
+ }
+
if (!tun)
return -EBADFD;
diff --git a/include/linux/if_tun.h b/include/linux/if_tun.h
index 3dbef10..fe6855d 100644
--- a/include/linux/if_tun.h
+++ b/include/linux/if_tun.h
@@ -84,6 +84,7 @@ struct tun_struct {
#define TUNSETOWNER _IOW('T', 204, int)
#define TUNSETLINK _IOW('T', 205, int)
#define TUNSETGROUP _IOW('T', 206, int)
+#define TUNGETFEATURES _IOR('T', 207, unsigned int)
/* TUNSETIFF ifr flags */
#define IFF_TUN 0x0001
@@ -93,6 +94,8 @@ struct tun_struct {
#define IFF_VIRTIO_HDR 0x4000
#define IFF_RECV_CSUM 0x8000
#define IFF_RECV_GSO 0x0800
+#define IFF_ALL_FLAGS (IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | \
+ IFF_VIRTIO_HDR | IFF_RECV_CSUM | IFF_RECV_GSO)
struct tun_pi {
unsigned short flags;
--
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