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netfilter: nf_tables: hide clash bit from userspace

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Its a kernel implementation detail, at least at this time:

We can later decide to revert this patch if there is a compelling
reason, but then we should also remove the ifdef that prevents exposure
of ip_conntrack_status enum IPS_NAT_CLASH value in the uapi header.

Clash entries are not included in dumps (true for both old /proc
and ctnetlink) either.  So for now exclude the clash bit when dumping.

Fixes: 7e5c6aa67e ("netfilter: nf_tables: add packets conntrack state to debug trace info")
Link: https://lore.kernel.org/netfilter-devel/aGwf3dCggwBlRKKC@strlen.de/
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2025-07-07 22:32:44 +02:00 • committed by Pablo Neira Ayuso
parent 6dc2fae7f8
commit 6ac86ac74e
1 changed files with 3 additions and 0 deletions
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3
net/netfilter/nf_tables_trace.c
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@ -127,6 +127,9 @@ static int nf_trace_fill_ct_info(struct sk_buff *nlskb,
if (nla_put_be32(nlskb, NFTA_TRACE_CT_ID, (__force __be32)id))
return -1;
/* Kernel implementation detail, withhold this from userspace for now */
status &= ~IPS_NAT_CLASH;
if (status && nla_put_be32(nlskb, NFTA_TRACE_CT_STATUS, htonl(status)))
return -1;
}