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netfilter: flowtable: use skb_pull_rcsum() to pop vlan/pppoe header

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This adjusts the checksum, if required, after pulling the layer 2
header, either the pppoe header or the inner vlan header in the
double-tagged vlan packets.

Fixes: 4cd91f7c29 ("netfilter: flowtable: add vlan support")
Fixes: 72efd585f7 ("netfilter: flowtable: add pppoe support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso
2026-04-30 21:55:01 +02:00
parent 69c54f80f4
commit baa3c65435
1 changed files with 2 additions and 2 deletions
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4
net/netfilter/nf_flow_table_ip.c
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@@ -445,13 +445,13 @@ static void nf_flow_encap_pop(struct nf_flowtable_ctx *ctx,
switch (skb->protocol) {
case htons(ETH_P_8021Q):
vlan_hdr = (struct vlan_hdr *)skb->data;
__skb_pull(skb, VLAN_HLEN);
skb_pull_rcsum(skb, VLAN_HLEN);
vlan_set_encap_proto(skb, vlan_hdr);
skb_reset_network_header(skb);
break;
case htons(ETH_P_PPP_SES):
skb->protocol = __nf_flow_pppoe_proto(skb);
skb_pull(skb, PPPOE_SES_HLEN);
skb_pull_rcsum(skb, PPPOE_SES_HLEN);
skb_reset_network_header(skb);
break;
}