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authorToshiaki Makita <makita.toshiaki@lab.ntt.co.jp>2014-12-22 19:04:14 +0900
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-01-27 08:18:53 -0800
commit72111ffa1946a7fc2f476265e7237ce2ce654624 (patch)
tree04de49102c5ed41b711e49d1cd122c0e98d6e801 /net/core/dev.c
parentb27b36d5d0383133a76661e8e7604ea952ff5cb8 (diff)
downloadlinux-linaro-stable-72111ffa1946a7fc2f476265e7237ce2ce654624.tar.gz
net: Fix stacked vlan offload features computation
[ Upstream commit 796f2da81bead71ffc91ef70912cd8d1827bf756 ] When vlan tags are stacked, it is very likely that the outer tag is stored in skb->vlan_tci and skb->protocol shows the inner tag's vlan_proto. Currently netif_skb_features() first looks at skb->protocol even if there is the outer tag in vlan_tci, thus it incorrectly retrieves the protocol encapsulated by the inner vlan instead of the inner vlan protocol. This allows GSO packets to be passed to HW and they end up being corrupted. Fixes: 58e998c6d239 ("offloading: Force software GSO for multiple vlan tags.") Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/core/dev.c')
-rw-r--r--net/core/dev.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 3ed11a555834..8ee8f9b39355 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2529,11 +2529,14 @@ netdev_features_t netif_skb_dev_features(struct sk_buff *skb,
if (skb_shinfo(skb)->gso_segs > dev->gso_max_segs)
features &= ~NETIF_F_GSO_MASK;
- if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD)) {
- struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
- protocol = veh->h_vlan_encapsulated_proto;
- } else if (!vlan_tx_tag_present(skb)) {
- return harmonize_features(skb, dev, features);
+ if (!vlan_tx_tag_present(skb)) {
+ if (unlikely(protocol == htons(ETH_P_8021Q) ||
+ protocol == htons(ETH_P_8021AD))) {
+ struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
+ protocol = veh->h_vlan_encapsulated_proto;
+ } else {
+ return harmonize_features(skb, dev, features);
+ }
}
features &= (dev->vlan_features | NETIF_F_HW_VLAN_CTAG_TX |