Hi Jozsef,
Thank you. Yes, that is true, the count can still be incorrect in the
case of a huge set.
Thanks,
Vishwanath
On 09/11/2017 03:36 PM, Jozsef Kadlecsik wrote:
> Hi,
>
> Your patch is applied in the ipset git tree and I'm going to push it for
> kernel inclusion.
>
> I modified the comment part: the elements counter can still be incorrect
> in the case of a huge set, because elements might time out during the
> listing.
>
> Thanks for your patience!
>
> Best regards,
> Jozsef
>
> On Thu, 17 Aug 2017, Vishwanath Pai wrote:
>
>> Simple testcase:
>>
>> $ ipset create test hash:ip timeout 5
>> $ ipset add test 1.2.3.4
>> $ ipset add test 1.2.2.2
>> $ sleep 5
>>
>> $ ipset l
>> Name: test
>> Type: hash:ip
>> Revision: 5
>> Header: family inet hashsize 1024 maxelem 65536 timeout 5
>> Size in memory: 296
>> References: 0
>> Number of entries: 2
>> Members:
>>
>> We return "Number of entries: 2" but no members are listed. That is
>> because mtype_list runs "ip_set_timeout_expired" and does not list the
>> expired entries, but set->elements is never upated (until mtype_gc
>> cleans it up later).
>>
>> Reviewed-by: Joshua Hunt <joh...@akamai.com>
>> Signed-off-by: Vishwanath Pai <v...@akamai.com>
>> ---
>> net/netfilter/ipset/ip_set_hash_gen.h | 12 +++++++++++-
>> 1 file changed, 11 insertions(+), 1 deletion(-)
>>
>> diff --git a/net/netfilter/ipset/ip_set_hash_gen.h
>> b/net/netfilter/ipset/ip_set_hash_gen.h
>> index f236c0b..ff3d31c 100644
>> --- a/net/netfilter/ipset/ip_set_hash_gen.h
>> +++ b/net/netfilter/ipset/ip_set_hash_gen.h
>> @@ -1041,12 +1041,22 @@ struct htype {
>> static int
>> mtype_head(struct ip_set *set, struct sk_buff *skb)
>> {
>> - const struct htype *h = set->data;
>> + struct htype *h = set->data;
>> const struct htable *t;
>> struct nlattr *nested;
>> size_t memsize;
>> u8 htable_bits;
>>
>> + /* If any members have expired, set->elements will be wrong
>> + * mytype_expire function will update it with the right count.
>> + * we do not hold set->lock here, so grab it first.
>> + */
>> + if (SET_WITH_TIMEOUT(set)) {
>> + spin_lock_bh(&set->lock);
>> + mtype_expire(set, h);
>> + spin_unlock_bh(&set->lock);
>> + }
>> +
>> rcu_read_lock_bh();
>> t = rcu_dereference_bh_nfnl(h->table);
>> memsize = mtype_ahash_memsize(h, t) + set->ext_size;
>> --
>> 1.9.1
>>
>>
>
> -
> E-mail : kad...@blackhole.kfki.hu, kadlecsik.joz...@wigner.mta.hu
> PGP key : http://www.kfki.hu/~kadlec/pgp_public_key.txt
> Address : Wigner Research Centre for Physics, Hungarian Academy of Sciences
> H-1525 Budapest 114, POB. 49, Hungary
>
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