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netfilter: xt_connlimit: remove connlimit_rnd_inited 

A potential race condition when generating connlimit_rnd is also fixed.

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Changli Gao 2011-03-15 13:26:32 +01:00 committed by Patrick McHardy
parent 3e0d5149e6
commit 4656c4d61a
1 changed files with 7 additions and 4 deletions
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11
net/netfilter/xt_connlimit.c
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@ -44,7 +44,6 @@ struct xt_connlimit_data {
};
static u_int32_t connlimit_rnd __read_mostly;
static bool connlimit_rnd_inited __read_mostly;
static inline unsigned int connlimit_iphash(__be32 addr)
{
@ -226,9 +225,13 @@ static int connlimit_mt_check(const struct xt_mtchk_param *par)
unsigned int i;
int ret;
if (unlikely(!connlimit_rnd_inited)) {
get_random_bytes(&connlimit_rnd, sizeof(connlimit_rnd));
connlimit_rnd_inited = true;
if (unlikely(!connlimit_rnd)) {
u_int32_t rand;
do {
get_random_bytes(&rand, sizeof(rand));
} while (!rand);
cmpxchg(&connlimit_rnd, 0, rand);
}
ret = nf_ct_l3proto_try_module_get(par->family);
if (ret < 0) {