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

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Message-Id: <20190424170920.251085561@linuxfoundation.org>
Date:   Wed, 24 Apr 2019 19:09:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yuya Kusakabe <yuya.kusakabe@...il.com>,
        Takeru Hayasaka <taketarou2@...il.com>,
        Toshiaki Makita <makita.toshiaki@....ntt.co.jp>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.19 06/96] net: Fix missing meta data in skb with vlan packet

From: Yuya Kusakabe <yuya.kusakabe@...il.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.kusakabe@...il.com>
Signed-off-by: Takeru Hayasaka <taketarou2@...il.com>
Co-developed-by: Takeru Hayasaka <taketarou2@...il.com>
Reviewed-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;
 }