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netfilter: nft_fwd_netdev: allow to redirect to ifb via ingress 

Set skb->tc_redirected to 1, otherwise the ifb driver drops the packet.
Set skb->tc_from_ingress to 1 to reinject the packet back to the ingress
path after leaving the ifb egress path.

This patch inconditionally sets on these two skb fields that are
meaningful to the ifb driver. The existing forward action is guaranteed
to run from ingress path.

Fixes: 39e6dea28a ("netfilter: nf_tables: add forward expression to the netdev family")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2020-03-23 19:53:10 +01:00
parent 76a109fac2
commit bcfabee1af
1 changed files with 4 additions and 0 deletions
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4
net/netfilter/nft_fwd_netdev.c
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@ -28,6 +28,10 @@ static void nft_fwd_netdev_eval(const struct nft_expr *expr,
struct nft_fwd_netdev *priv = nft_expr_priv(expr);
int oif = regs->data[priv->sreg_dev];
/* These are used by ifb only. */
pkt->skb->tc_redirected = 1;
pkt->skb->tc_from_ingress = 1;
nf_fwd_netdev_egress(pkt, oif);
regs->verdict.code = NF_STOLEN;
}