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netfilter: nft_payload: rebuild vlan header when needed
Skip rebuilding the vlan header when accessing destination and source mac address. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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4f325e2627
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de6843be30
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@ -171,7 +171,8 @@ void nft_payload_eval(const struct nft_expr *expr,
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if (!skb_mac_header_was_set(skb))
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goto err;
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if (skb_vlan_tag_present(skb)) {
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if (skb_vlan_tag_present(skb) &&
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priv->offset >= offsetof(struct ethhdr, h_proto)) {
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if (!nft_payload_copy_vlan(dest, skb,
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priv->offset, priv->len))
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goto err;
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