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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef TUN_VNET_H
#define TUN_VNET_H
/* High bits in flags field are unused. */
#define TUN_VNET_LE 0x80000000
#define TUN_VNET_BE 0x40000000
static inline bool tun_vnet_legacy_is_little_endian(unsigned int flags)
{
bool be = IS_ENABLED(CONFIG_TUN_VNET_CROSS_LE) &&
(flags & TUN_VNET_BE);
return !be && virtio_legacy_is_little_endian();
}
static inline long tun_get_vnet_be(unsigned int flags, int __user *argp)
{
int be = !!(flags & TUN_VNET_BE);
if (!IS_ENABLED(CONFIG_TUN_VNET_CROSS_LE))
return -EINVAL;
if (put_user(be, argp))
return -EFAULT;
return 0;
}
static inline long tun_set_vnet_be(unsigned int *flags, int __user *argp)
{
int be;
if (!IS_ENABLED(CONFIG_TUN_VNET_CROSS_LE))
return -EINVAL;
if (get_user(be, argp))
return -EFAULT;
if (be)
*flags |= TUN_VNET_BE;
else
*flags &= ~TUN_VNET_BE;
return 0;
}
static inline bool tun_vnet_is_little_endian(unsigned int flags)
{
return flags & TUN_VNET_LE || tun_vnet_legacy_is_little_endian(flags);
}
static inline u16 tun_vnet16_to_cpu(unsigned int flags, __virtio16 val)
{
return __virtio16_to_cpu(tun_vnet_is_little_endian(flags), val);
}
static inline __virtio16 cpu_to_tun_vnet16(unsigned int flags, u16 val)
{
return __cpu_to_virtio16(tun_vnet_is_little_endian(flags), val);
}
static inline long tun_vnet_ioctl(int *vnet_hdr_sz, unsigned int *flags,
unsigned int cmd, int __user *sp)
{
int s;
switch (cmd) {
case TUNGETVNETHDRSZ:
s = *vnet_hdr_sz;
if (put_user(s, sp))
return -EFAULT;
return 0;
case TUNSETVNETHDRSZ:
if (get_user(s, sp))
return -EFAULT;
if (s < (int)sizeof(struct virtio_net_hdr))
return -EINVAL;
*vnet_hdr_sz = s;
return 0;
case TUNGETVNETLE:
s = !!(*flags & TUN_VNET_LE);
if (put_user(s, sp))
return -EFAULT;
return 0;
case TUNSETVNETLE:
if (get_user(s, sp))
return -EFAULT;
if (s)
*flags |= TUN_VNET_LE;
else
*flags &= ~TUN_VNET_LE;
return 0;
case TUNGETVNETBE:
return tun_get_vnet_be(*flags, sp);
case TUNSETVNETBE:
return tun_set_vnet_be(flags, sp);
default:
return -EINVAL;
}
}
static inline int tun_vnet_hdr_get(int sz, unsigned int flags,
struct iov_iter *from,
struct virtio_net_hdr *hdr)
{
u16 hdr_len;
if (iov_iter_count(from) < sz)
return -EINVAL;
if (!copy_from_iter_full(hdr, sizeof(*hdr), from))
return -EFAULT;
hdr_len = tun_vnet16_to_cpu(flags, hdr->hdr_len);
if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
hdr_len = max(tun_vnet16_to_cpu(flags, hdr->csum_start) + tun_vnet16_to_cpu(flags, hdr->csum_offset) + 2, hdr_len);
hdr->hdr_len = cpu_to_tun_vnet16(flags, hdr_len);
}
if (hdr_len > iov_iter_count(from))
return -EINVAL;
iov_iter_advance(from, sz - sizeof(*hdr));
return hdr_len;
}
static inline int tun_vnet_hdr_put(int sz, struct iov_iter *iter,
const struct virtio_net_hdr *hdr)
{
if (unlikely(iov_iter_count(iter) < sz))
return -EINVAL;
if (unlikely(copy_to_iter(hdr, sizeof(*hdr), iter) != sizeof(*hdr)))
return -EFAULT;
if (iov_iter_zero(sz - sizeof(*hdr), iter) != sz - sizeof(*hdr))
return -EFAULT;
return 0;
}
static inline int tun_vnet_hdr_to_skb(unsigned int flags, struct sk_buff *skb,
const struct virtio_net_hdr *hdr)
{
return virtio_net_hdr_to_skb(skb, hdr, tun_vnet_is_little_endian(flags));
}
static inline int tun_vnet_hdr_from_skb(unsigned int flags,
const struct net_device *dev,
const struct sk_buff *skb,
struct virtio_net_hdr *hdr)
{
int vlan_hlen = skb_vlan_tag_present(skb) ? VLAN_HLEN : 0;
if (virtio_net_hdr_from_skb(skb, hdr,
tun_vnet_is_little_endian(flags), true,
vlan_hlen)) {
struct skb_shared_info *sinfo = skb_shinfo(skb);
if (net_ratelimit()) {
netdev_err(dev, "unexpected GSO type: 0x%x, gso_size %d, hdr_len %d\n",
sinfo->gso_type, tun_vnet16_to_cpu(flags, hdr->gso_size),
tun_vnet16_to_cpu(flags, hdr->hdr_len));
print_hex_dump(KERN_ERR, "tun: ",
DUMP_PREFIX_NONE,
16, 1, skb->head,
min(tun_vnet16_to_cpu(flags, hdr->hdr_len), 64), true);
}
WARN_ON_ONCE(1);
return -EINVAL;
}
return 0;
}
#endif /* TUN_VNET_H */
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