From: Jason Wang <jasowang@redhat.com>
To: davem@davemloft.net, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: Jason Wang <jasowang@redhat.com>,
Vlad Yasevich <vyasevich@gmail.com>,
Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>,
"Michael S. Tsirkin" <mst@redhat.com>
Subject: [PATCH net V3 2/2] macvtap: signal truncated packets
Date: Wed, 11 Dec 2013 13:08:34 +0800 [thread overview]
Message-ID: <1386738514-1502-2-git-send-email-jasowang@redhat.com> (raw)
In-Reply-To: <1386738514-1502-1-git-send-email-jasowang@redhat.com>
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 trunca
checking work.
Cc: Vlad Yasevich <vyasevich@gmail.com>
Cc: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
Changes from V2:
- use total as the bytes of packet returned
Changes from V1:
- increase total unconditionally
- do not move the structure veth out of the vlan handling block
---
drivers/net/macvtap.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 957cc5c..2a89da0 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -770,7 +770,7 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
int ret;
int vnet_hdr_len = 0;
int vlan_offset = 0;
- int copied;
+ int copied, total;
if (q->flags & IFF_VNET_HDR) {
struct virtio_net_hdr vnet_hdr;
@@ -785,7 +785,8 @@ 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;
+ total = copied = vnet_hdr_len;
+ total += skb->len;
if (!vlan_tx_tag_present(skb))
len = min_t(int, skb->len, len);
@@ -800,6 +801,7 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto);
len = min_t(int, skb->len + VLAN_HLEN, len);
+ total += VLAN_HLEN;
copy = min_t(int, vlan_offset, len);
ret = skb_copy_datagram_const_iovec(skb, 0, iv, copied, copy);
@@ -817,10 +819,9 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
}
ret = skb_copy_datagram_const_iovec(skb, vlan_offset, iv, copied, len);
- copied += len;
done:
- return ret ? ret : copied;
+ return ret ? ret : total;
}
static ssize_t macvtap_do_read(struct macvtap_queue *q, struct kiocb *iocb,
@@ -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:
--
1.8.3.2
next prev parent reply other threads:[~2013-12-11 5:09 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-11 5:08 [PATCH net V3 1/2] tun: unbreak truncated packet signalling Jason Wang
2013-12-11 5:08 ` Jason Wang [this message]
2013-12-11 14:25 ` [PATCH net V3 2/2] macvtap: signal truncated packets Vlad Yasevich
2013-12-11 14:32 ` Michael S. Tsirkin
2013-12-11 20:26 ` David Miller
2013-12-11 14:32 ` [PATCH net V3 1/2] tun: unbreak truncated packet signalling Michael S. Tsirkin
2013-12-11 20:26 ` David Miller
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