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authorHerbert Xu <herbert@gondor.apana.org.au>2014-11-03 14:01:25 +0800
committerDavid S. Miller <davem@davemloft.net>2014-11-03 14:52:20 -0500
commit3ce9b20f1971690b8b3b620e735ec99431573b39 (patch)
tree03683cd036092b08a4664d8728c5e300e4e35fb6 /drivers
parentf4c4a4e068a3f43b84bc1bcb9beb295dd5ff2529 (diff)
downloadlinux-3ce9b20f1971690b8b3b620e735ec99431573b39.tar.bz2
macvtap: Fix csum_start when VLAN tags are present
When VLAN is in use in macvtap_put_user, we end up setting csum_start to the wrong place. The result is that the whoever ends up doing the checksum setting will corrupt the packet instead of writing the checksum to the expected location, usually this means writing the checksum with an offset of -4. This patch fixes this by adjusting csum_start when VLAN tags are detected. Fixes: f09e2249c4f5 ("macvtap: restore vlan header on user read") Cc: stable@vger.kernel.org Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Cheers, Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/macvtap.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 6f226de655a4..880cc090dc44 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -629,6 +629,8 @@ static void macvtap_skb_to_vnet_hdr(const struct sk_buff *skb,
if (skb->ip_summed == CHECKSUM_PARTIAL) {
vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
vnet_hdr->csum_start = skb_checksum_start_offset(skb);
+ if (vlan_tx_tag_present(skb))
+ vnet_hdr->csum_start += VLAN_HLEN;
vnet_hdr->csum_offset = skb->csum_offset;
} else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
vnet_hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID;