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path: root/drivers/net/tun.c
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Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c32
1 files changed, 28 insertions, 4 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index e525a6cf5587..6b150c072a41 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -110,6 +110,9 @@ struct tun_struct {
struct tap_filter txflt;
struct socket socket;
struct socket_wq wq;
+
+ int vnet_hdr_sz;
+
#ifdef TUN_DEBUG
int debug;
#endif
@@ -563,7 +566,7 @@ static __inline__ ssize_t tun_get_user(struct tun_struct *tun,
}
if (tun->flags & TUN_VNET_HDR) {
- if ((len -= sizeof(gso)) > count)
+ if ((len -= tun->vnet_hdr_sz) > count)
return -EINVAL;
if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso)))
@@ -575,7 +578,7 @@ static __inline__ ssize_t tun_get_user(struct tun_struct *tun,
if (gso.hdr_len > len)
return -EINVAL;
- offset += sizeof(gso);
+ offset += tun->vnet_hdr_sz;
}
if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) {
@@ -718,7 +721,7 @@ static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
if (tun->flags & TUN_VNET_HDR) {
struct virtio_net_hdr gso = { 0 }; /* no info leak */
- if ((len -= sizeof(gso)) < 0)
+ if ((len -= tun->vnet_hdr_sz) < 0)
return -EINVAL;
if (skb_is_gso(skb)) {
@@ -749,7 +752,7 @@ static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total,
sizeof(gso))))
return -EFAULT;
- total += sizeof(gso);
+ total += tun->vnet_hdr_sz;
}
len = min_t(int, skb->len, len);
@@ -1035,6 +1038,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
tun->dev = dev;
tun->flags = flags;
tun->txflt.count = 0;
+ tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr);
err = -ENOMEM;
sk = sk_alloc(net, AF_UNSPEC, GFP_KERNEL, &tun_proto);
@@ -1177,6 +1181,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
struct sock_fprog fprog;
struct ifreq ifr;
int sndbuf;
+ int vnet_hdr_sz;
int ret;
if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
@@ -1322,6 +1327,25 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
tun->socket.sk->sk_sndbuf = sndbuf;
break;
+ case TUNGETVNETHDRSZ:
+ vnet_hdr_sz = tun->vnet_hdr_sz;
+ if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz)))
+ ret = -EFAULT;
+ break;
+
+ case TUNSETVNETHDRSZ:
+ if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) {
+ ret = -EFAULT;
+ break;
+ }
+ if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) {
+ ret = -EINVAL;
+ break;
+ }
+
+ tun->vnet_hdr_sz = vnet_hdr_sz;
+ break;
+
case TUNATTACHFILTER:
/* Can be set only for TAPs */
ret = -EINVAL;