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path: root/net/netfilter/nf_conntrack_core.c
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Diffstat (limited to 'net/netfilter/nf_conntrack_core.c')
-rw-r--r--net/netfilter/nf_conntrack_core.c24
1 files changed, 19 insertions, 5 deletions
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 1b63359d2bb8..29fa08b3ab82 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -469,11 +469,18 @@ ____nf_conntrack_find(struct net *net, const struct nf_conntrack_zone *zone,
const struct nf_conntrack_tuple *tuple, u32 hash)
{
struct nf_conntrack_tuple_hash *h;
+ struct hlist_nulls_head *ct_hash;
struct hlist_nulls_node *n;
- unsigned int bucket = hash_bucket(hash, net);
+ unsigned int bucket, sequence;
begin:
- hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[bucket], hnnode) {
+ do {
+ sequence = read_seqcount_begin(&nf_conntrack_generation);
+ bucket = hash_bucket(hash, net);
+ ct_hash = net->ct.hash;
+ } while (read_seqcount_retry(&nf_conntrack_generation, sequence));
+
+ hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[bucket], hnnode) {
if (nf_ct_key_equal(h, tuple, zone)) {
NF_CT_STAT_INC_ATOMIC(net, found);
return h;
@@ -722,15 +729,21 @@ nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
struct net *net = nf_ct_net(ignored_conntrack);
const struct nf_conntrack_zone *zone;
struct nf_conntrack_tuple_hash *h;
+ struct hlist_nulls_head *ct_hash;
+ unsigned int hash, sequence;
struct hlist_nulls_node *n;
struct nf_conn *ct;
- unsigned int hash;
zone = nf_ct_zone(ignored_conntrack);
- hash = hash_conntrack(net, tuple);
rcu_read_lock();
- hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) {
+ do {
+ sequence = read_seqcount_begin(&nf_conntrack_generation);
+ hash = hash_conntrack(net, tuple);
+ ct_hash = net->ct.hash;
+ } while (read_seqcount_retry(&nf_conntrack_generation, sequence));
+
+ hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[hash], hnnode) {
ct = nf_ct_tuplehash_to_ctrack(h);
if (ct != ignored_conntrack &&
nf_ct_tuple_equal(tuple, &h->tuple) &&
@@ -1607,6 +1620,7 @@ int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
nf_conntrack_all_unlock();
local_bh_enable();
+ synchronize_net();
nf_ct_free_hashtable(old_hash, old_size);
return 0;
}