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netfilter: conntrack: consider ct netns in early_drop logic 

When iterating, skip conntrack entries living in a different netns.

We could ignore netns and kill some other non-assured one, but it
has two problems:

- a netns can kill non-assured conntracks in other namespace
- we would start to 'over-subscribe' the affected/overlimit netns.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2016-05-02 18:40:14 +02:00 committed by Pablo Neira Ayuso
parent 56d52d4892
commit 3e86638e9a
1 changed files with 25 additions and 18 deletions
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43
net/netfilter/nf_conntrack_core.c
View File

@ -764,18 +764,20 @@ static noinline int early_drop(struct net *net, unsigned int _hash)
{
/* Use oldest entry, which is roughly LRU */
struct nf_conntrack_tuple_hash *h;
struct nf_conn *ct = NULL, *tmp;
struct nf_conn *tmp;
struct hlist_nulls_node *n;
unsigned int i = 0, cnt = 0;
int dropped = 0;
unsigned int hash, sequence;
unsigned int i, hash, sequence;
struct nf_conn *ct = NULL;
spinlock_t *lockp;
bool ret = false;
i = 0;
local_bh_disable();
restart:
sequence = read_seqcount_begin(&nf_conntrack_generation);
hash = scale_hash(_hash);
for (; i < nf_conntrack_htable_size; i++) {
for (; i < NF_CT_EVICTION_RANGE; i++) {
hash = scale_hash(_hash++);
lockp = &nf_conntrack_locks[hash % CONNTRACK_LOCKS];
nf_conntrack_lock(lockp);
if (read_seqcount_retry(&nf_conntrack_generation, sequence)) {
@ -785,35 +787,40 @@ restart:
hlist_nulls_for_each_entry_rcu(h, n, &nf_conntrack_hash[hash],
hnnode) {
tmp = nf_ct_tuplehash_to_ctrack(h);
if (!test_bit(IPS_ASSURED_BIT, &tmp->status) &&
!nf_ct_is_dying(tmp) &&
atomic_inc_not_zero(&tmp->ct_general.use)) {
if (test_bit(IPS_ASSURED_BIT, &tmp->status) ||
!net_eq(nf_ct_net(tmp), net) ||
nf_ct_is_dying(tmp))
continue;
if (atomic_inc_not_zero(&tmp->ct_general.use)) {
ct = tmp;
break;
}
cnt++;
}
hash = (hash + 1) % nf_conntrack_htable_size;
spin_unlock(lockp);
if (ct || cnt >= NF_CT_EVICTION_RANGE)
if (ct)
break;
}
local_bh_enable();
if (!ct)
return dropped;
return false;
if (del_timer(&ct->timeout)) {
/* kill only if in same netns -- might have moved due to
* SLAB_DESTROY_BY_RCU rules
*/
if (net_eq(nf_ct_net(ct), net) && del_timer(&ct->timeout)) {
if (nf_ct_delete(ct, 0, 0)) {
dropped = 1;
NF_CT_STAT_INC_ATOMIC(net, early_drop);
ret = true;
}
}
nf_ct_put(ct);
return dropped;
return ret;
}
static struct nf_conn *