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netfilter: conntrack: gre: don't set assured flag for clash entries

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Now that conntrack core is allowd to insert clashing entries, make sure
GRE won't set assured flag on NAT_CLASH entries, just like UDP.

Doing so prevents early_drop logic for these entries.

Fixes: d671fd82ea ("netfilter: conntrack: allow insertion clash of gre protocol")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2023-07-03 13:43:18 +02:00 committed by Pablo Neira Ayuso
parent 1689f25924
commit 8a9dc07ba9
1 changed files with 9 additions and 1 deletions
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10
net/netfilter/nf_conntrack_proto_gre.c
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@ -205,6 +205,8 @@ int nf_conntrack_gre_packet(struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state)
{
unsigned long status;
if (!nf_ct_is_confirmed(ct)) {
unsigned int *timeouts = nf_ct_timeout_lookup(ct);
@ -217,11 +219,17 @@ int nf_conntrack_gre_packet(struct nf_conn *ct,
ct->proto.gre.timeout = timeouts[GRE_CT_UNREPLIED];
}
status = READ_ONCE(ct->status);
/* If we've seen traffic both ways, this is a GRE connection.
* Extend timeout. */
if (ct->status & IPS_SEEN_REPLY) {
if (status & IPS_SEEN_REPLY) {
nf_ct_refresh_acct(ct, ctinfo, skb,
ct->proto.gre.stream_timeout);
/* never set ASSURED for IPS_NAT_CLASH, they time out soon */
if (unlikely((status & IPS_NAT_CLASH)))
return NF_ACCEPT;
/* Also, more likely to be important, and not a probe. */
if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status))
nf_conntrack_event_cache(IPCT_ASSURED, ct);