From 4a6fbdd801e882ee6ca5cdfdc3374f0ae263174c Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Fri, 17 Dec 2021 11:29:56 +0100 Subject: [PATCH] netfilter: conntrack: tag conntracks picked up in local out hook This allows to identify flows that originate from local machine in a followup patch. It would be possible to make this a ->status bit instead. For now I did not do that yet because I don't have a use-case for exposing this info to userspace. If one comes up the toggle can be replaced with a status bit. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- include/net/netfilter/nf_conntrack.h | 1 + net/netfilter/nf_conntrack_core.c | 3 +++ 2 files changed, 4 insertions(+) diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h index d24b0a34..871489df 100644 --- a/include/net/netfilter/nf_conntrack.h +++ b/include/net/netfilter/nf_conntrack.h @@ -95,6 +95,7 @@ struct nf_conn { unsigned long status; u16 cpu; + u16 local_origin:1; possible_net_t ct_net; #if IS_ENABLED(CONFIG_NF_NAT) diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index d7e3135..bed0017 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -1747,6 +1747,9 @@ resolve_normal_ct(struct nf_conn *tmpl, return 0; if (IS_ERR(h)) return PTR_ERR(h); + + ct = nf_ct_tuplehash_to_ctrack(h); + ct->local_origin = state->hook == NF_INET_LOCAL_OUT; } ct = nf_ct_tuplehash_to_ctrack(h); -- 2.7.4