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netfilter: nft_payload: rebuild vlan header when needed

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Skip rebuilding the vlan header when accessing destination and source
mac address.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso
2023-06-06 09:38:42 +02:00
parent 4f325e2627
commit de6843be30
1 changed files with 2 additions and 1 deletions
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3
net/netfilter/nft_payload.c
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@@ -171,7 +171,8 @@ void nft_payload_eval(const struct nft_expr *expr,
if (!skb_mac_header_was_set(skb))
goto err;
if (skb_vlan_tag_present(skb)) {
if (skb_vlan_tag_present(skb) &&
priv->offset >= offsetof(struct ethhdr, h_proto)) {
if (!nft_payload_copy_vlan(dest, skb,
priv->offset, priv->len))
goto err;