[PATCH 4.19 06/96] net: Fix missing meta data in skb with vlan packet

[Greg Kroah-Hartman]

From: Yuya Kusakabe <yuya.kusak...@gmail.com>

[ Upstream commit d85e8be2a5a02869f815dd0ac2d743deb4cd7957 ]

skb_reorder_vlan_header() should move XDP meta data with ethernet header
if XDP meta data exists.

Fixes: de8f3a83b0a0 ("bpf: add meta pointer for direct access")
Signed-off-by: Yuya Kusakabe <yuya.kusak...@gmail.com>
Signed-off-by: Takeru Hayasaka <taketar...@gmail.com>
Co-developed-by: Takeru Hayasaka <taketar...@gmail.com>
Reviewed-by: Toshiaki Makita <makita.toshi...@lab.ntt.co.jp>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/core/skbuff.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5071,7 +5071,8 @@ EXPORT_SYMBOL_GPL(skb_gso_validate_mac_l
 
 static struct sk_buff *skb_reorder_vlan_header(struct sk_buff *skb)
 {
-       int mac_len;
+       int mac_len, meta_len;
+       void *meta;
 
        if (skb_cow(skb, skb_headroom(skb)) < 0) {
                kfree_skb(skb);
@@ -5083,6 +5084,13 @@ static struct sk_buff *skb_reorder_vlan_
                memmove(skb_mac_header(skb) + VLAN_HLEN, skb_mac_header(skb),
                        mac_len - VLAN_HLEN - ETH_TLEN);
        }
+
+       meta_len = skb_metadata_len(skb);
+       if (meta_len) {
+               meta = skb_metadata_end(skb) - meta_len;
+               memmove(meta + VLAN_HLEN, meta, meta_len);
+       }
+
        skb->mac_header += VLAN_HLEN;
        return skb;
 }