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macvtap: restore vlan header on user read

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Ethernet vlan header is not on the packet and kept in the skb->vlan_tci
when it comes from lower dev. This patch inserts vlan header in user
buffer during skb copy on user read.

Signed-off-by: Basil Gor <basil.gor@gmail.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Basil Gor 2012-05-03 22:55:24 +00:00 committed by David S. Miller
parent c53cff5e42
commit f09e2249c4
1 changed files with 37 additions and 4 deletions
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39
drivers/net/macvtap.c
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@ -1,5 +1,6 @@
#include <linux/etherdevice.h>
#include <linux/if_macvlan.h>
#include <linux/if_vlan.h>
#include <linux/interrupt.h>
#include <linux/nsproxy.h>
#include <linux/compat.h>
@ -759,6 +760,8 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
struct macvlan_dev *vlan;
int ret;
int vnet_hdr_len = 0;
int vlan_offset = 0;
int copied;
if (q->flags & IFF_VNET_HDR) {
struct virtio_net_hdr vnet_hdr;
@ -773,18 +776,48 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
if (memcpy_toiovecend(iv, (void *)&vnet_hdr, 0, sizeof(vnet_hdr)))
return -EFAULT;
}
copied = vnet_hdr_len;
if (!vlan_tx_tag_present(skb))
len = min_t(int, skb->len, len);
else {
int copy;
struct {
__be16 h_vlan_proto;
__be16 h_vlan_TCI;
} veth;
veth.h_vlan_proto = htons(ETH_P_8021Q);
veth.h_vlan_TCI = htons(vlan_tx_tag_get(skb));
ret = skb_copy_datagram_const_iovec(skb, 0, iv, vnet_hdr_len, len);
vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto);
len = min_t(int, skb->len + VLAN_HLEN, len);
copy = min_t(int, vlan_offset, len);
ret = skb_copy_datagram_const_iovec(skb, 0, iv, copied, copy);
len -= copy;
copied += copy;
if (ret || !len)
goto done;
copy = min_t(int, sizeof(veth), len);
ret = memcpy_toiovecend(iv, (void *)&veth, copied, copy);
len -= copy;
copied += copy;
if (ret || !len)
goto done;
}
ret = skb_copy_datagram_const_iovec(skb, vlan_offset, iv, copied, len);
copied += len;
done:
rcu_read_lock_bh();
vlan = rcu_dereference_bh(q->vlan);
if (vlan)
macvlan_count_rx(vlan, len, ret == 0, 0);
macvlan_count_rx(vlan, copied - vnet_hdr_len, ret == 0, 0);
rcu_read_unlock_bh();
return ret ? ret : (len + vnet_hdr_len);
return ret ? ret : copied;
}
static ssize_t macvtap_do_read(struct macvtap_queue *q, struct kiocb *iocb,