From bcfabee1afd99484b6ba067361b8678e28bbc065 Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Mon, 23 Mar 2020 19:53:10 +0100 Subject: [PATCH] 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: 39e6dea28adc ("netfilter: nf_tables: add forward expression to the netdev family") Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nft_fwd_netdev.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/netfilter/nft_fwd_netdev.c b/net/netfilter/nft_fwd_netdev.c index ddd28de..74f050b 100644 --- a/net/netfilter/nft_fwd_netdev.c +++ b/net/netfilter/nft_fwd_netdev.c @@ -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; } -- 2.7.4