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netfilter: nft_fwd_netdev: Support egress hook 

Allow packet redirection to another interface upon egress.

[lukas: set skb_iif, add commit message, original patch from Pablo. ]
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2021-11-09 13:42:01 +01:00
parent 632cb151ca
commit f87b9464d1
1 changed files with 5 additions and 2 deletions
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7
net/netfilter/nft_fwd_netdev.c
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@ -27,9 +27,11 @@ 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];
struct sk_buff *skb = pkt->skb;
/* This is used by ifb only. */
skb_set_redirected(pkt->skb, true);
skb->skb_iif = skb->dev->ifindex;
skb_set_redirected(skb, nft_hook(pkt) == NF_NETDEV_INGRESS);
nf_fwd_netdev_egress(pkt, oif);
regs->verdict.code = NF_STOLEN;
@ -198,7 +200,8 @@ static int nft_fwd_validate(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nft_data **data)
{
return nft_chain_validate_hooks(ctx->chain, (1 << NF_NETDEV_INGRESS));
return nft_chain_validate_hooks(ctx->chain, (1 << NF_NETDEV_INGRESS) |
(1 << NF_NETDEV_EGRESS));
}
static struct nft_expr_type nft_fwd_netdev_type;