This is a note to let you know that I've just added the patch titled netfilter: ipset: Update byte and packet counters regardless of whether they match to the 5.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: netfilter-ipset-update-byte-and-packet-counters-rega.patch and it can be found in the queue-5.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 7dfaef808151e6a502d4fef8beb3a013f5bb2bf5 Author: Stefano Brivio <sbrivio@xxxxxxxxxx> Date: Thu Oct 29 16:39:46 2020 +0100 netfilter: ipset: Update byte and packet counters regardless of whether they match [ Upstream commit 7d10e62c2ff8e084c136c94d32d9a94de4d31248 ] In ip_set_match_extensions(), for sets with counters, we take care of updating counters themselves by calling ip_set_update_counter(), and of checking if the given comparison and values match, by calling ip_set_match_counter() if needed. However, if a given comparison on counters doesn't match the configured values, that doesn't mean the set entry itself isn't matching. This fix restores the behaviour we had before commit 4750005a85f7 ("netfilter: ipset: Fix "don't update counters" mode when counters used at the matching"), without reintroducing the issue fixed there: back then, mtype_data_match() first updated counters in any case, and then took care of matching on counters. Now, if the IPSET_FLAG_SKIP_COUNTER_UPDATE flag is set, ip_set_update_counter() will anyway skip counter updates if desired. The issue observed is illustrated by this reproducer: ipset create c hash:ip counters ipset add c 192.0.2.1 iptables -I INPUT -m set --match-set c src --bytes-gt 800 -j DROP if we now send packets from 192.0.2.1, bytes and packets counters for the entry as shown by 'ipset list' are always zero, and, no matter how many bytes we send, the rule will never match, because counters themselves are not updated. Reported-by: Mithil Mhatre <mmhatre@xxxxxxxxxx> Fixes: 4750005a85f7 ("netfilter: ipset: Fix "don't update counters" mode when counters used at the matching") Signed-off-by: Stefano Brivio <sbrivio@xxxxxxxxxx> Signed-off-by: Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxx> Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c index 920b7c4331f0c..2643dc982eb4e 100644 --- a/net/netfilter/ipset/ip_set_core.c +++ b/net/netfilter/ipset/ip_set_core.c @@ -652,13 +652,14 @@ ip_set_match_extensions(struct ip_set *set, const struct ip_set_ext *ext, if (SET_WITH_COUNTER(set)) { struct ip_set_counter *counter = ext_counter(data, set); + ip_set_update_counter(counter, ext, flags); + if (flags & IPSET_FLAG_MATCH_COUNTERS && !(ip_set_match_counter(ip_set_get_packets(counter), mext->packets, mext->packets_op) && ip_set_match_counter(ip_set_get_bytes(counter), mext->bytes, mext->bytes_op))) return false; - ip_set_update_counter(counter, ext, flags); } if (SET_WITH_SKBINFO(set)) ip_set_get_skbinfo(ext_skbinfo(data, set),