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authorJason Wang <jasowang@redhat.com>2013-12-09 11:25:17 +0100
committerDavid S. Miller <davem@davemloft.net>2013-12-11 04:06:49 +0100
commit730054da3868c35809fd31a4018044ab10b0e215 (patch)
tree7b83e6854b19f4204e8785977f97ac3ff51df03a /drivers/net/macvtap.c
parenttun: unbreak truncated packet signalling (diff)
downloadlinux-730054da3868c35809fd31a4018044ab10b0e215.tar.xz
linux-730054da3868c35809fd31a4018044ab10b0e215.zip
macvtap: signal truncated packets
macvtap_put_user() never return a value grater than iov length, this in fact bypasses the truncated checking in macvtap_recvmsg(). Fix this by always returning the size of packet plus the possible vlan header to let the truncated checking work. Cc: Vlad Yasevich <vyasevich@gmail.com> Cc: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/macvtap.c')
-rw-r--r--drivers/net/macvtap.c27
1 files changed, 14 insertions, 13 deletions
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 957cc5c3653d..7544a0c686b4 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -767,10 +767,14 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
const struct sk_buff *skb,
const struct iovec *iv, int len)
{
- int ret;
+ int ret, off;
int vnet_hdr_len = 0;
int vlan_offset = 0;
int copied;
+ struct {
+ __be16 h_vlan_proto;
+ __be16 h_vlan_TCI;
+ } veth;
if (q->flags & IFF_VNET_HDR) {
struct virtio_net_hdr vnet_hdr;
@@ -785,16 +789,13 @@ 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;
+ off = 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 = skb->vlan_proto;
veth.h_vlan_TCI = htons(vlan_tx_tag_get(skb));
@@ -802,22 +803,22 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
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);
+ ret = skb_copy_datagram_const_iovec(skb, 0, iv, off, copy);
len -= copy;
- copied += copy;
+ off += copy;
if (ret || !len)
goto done;
copy = min_t(int, sizeof(veth), len);
- ret = memcpy_toiovecend(iv, (void *)&veth, copied, copy);
+ ret = memcpy_toiovecend(iv, (void *)&veth, off, copy);
len -= copy;
- copied += copy;
+ off += copy;
if (ret || !len)
goto done;
}
- ret = skb_copy_datagram_const_iovec(skb, vlan_offset, iv, copied, len);
- copied += len;
+ ret = skb_copy_datagram_const_iovec(skb, vlan_offset, iv, off, len);
+ copied += skb->len + (vlan_offset ? sizeof(veth) : 0);
done:
return ret ? ret : copied;
@@ -875,7 +876,7 @@ static ssize_t macvtap_aio_read(struct kiocb *iocb, const struct iovec *iv,
}
ret = macvtap_do_read(q, iocb, iv, len, file->f_flags & O_NONBLOCK);
- ret = min_t(ssize_t, ret, len); /* XXX copied from tun.c. Why? */
+ ret = min_t(ssize_t, ret, len);
if (ret > 0)
iocb->ki_pos = ret;
out: