From: Sasha Levin Date: Wed, 30 Aug 2023 01:07:43 +0000 (+0200) Subject: netfilter, bpf: Adjust timeouts of non-confirmed CTs in bpf_ct_insert_entry() X-Git-Tag: archive/raspbian/6.1.55-1+rpi1^2~47 X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=55df444bec859ef487e992296ce13ecdd83dc2e1;p=linux.git netfilter, bpf: Adjust timeouts of non-confirmed CTs in bpf_ct_insert_entry() [ Upstream commit 837723b22a63cfbff584655b009b9d488d0e9087 ] bpf_nf testcase fails on s390x: bpf_skb_ct_lookup() cannot find the entry that was added by bpf_ct_insert_entry() within the same BPF function. The reason is that this entry is deleted by nf_ct_gc_expired(). The CT timeout starts ticking after the CT confirmation; therefore nf_conn.timeout is initially set to the timeout value, and __nf_conntrack_confirm() sets it to the deadline value. bpf_ct_insert_entry() sets IPS_CONFIRMED_BIT, but does not adjust the timeout, making its value meaningless and causing false positives. Fix the problem by making bpf_ct_insert_entry() adjust the timeout, like __nf_conntrack_confirm(). Fixes: 2cdaa3eefed8 ("netfilter: conntrack: restore IPS_CONFIRMED out of nf_conntrack_hash_check_insert()") Signed-off-by: Ilya Leoshkevich Signed-off-by: Daniel Borkmann Cc: Florian Westphal Link: https://lore.kernel.org/bpf/20230830011128.1415752-3-iii@linux.ibm.com Signed-off-by: Alexei Starovoitov Signed-off-by: Sasha Levin Gbp-Pq: Topic bugfix/all Gbp-Pq: Name netfilter-bpf-adjust-timeouts-of-non-confirmed-cts-i.patch --- diff --git a/net/netfilter/nf_conntrack_bpf.c b/net/netfilter/nf_conntrack_bpf.c index 8639e7efd0e..816283f0aa5 100644 --- a/net/netfilter/nf_conntrack_bpf.c +++ b/net/netfilter/nf_conntrack_bpf.c @@ -384,6 +384,8 @@ struct nf_conn *bpf_ct_insert_entry(struct nf_conn___init *nfct_i) struct nf_conn *nfct = (struct nf_conn *)nfct_i; int err; + if (!nf_ct_is_confirmed(nfct)) + nfct->timeout += nfct_time_stamp; nfct->status |= IPS_CONFIRMED; err = nf_conntrack_hash_check_insert(nfct); if (err < 0) {