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NetLabel: convert the unlabeled accept flag to use RCU

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Currently the NetLabel unlabeled packet accept flag is an atomic type and it
is checked for every non-NetLabel packet which comes into the system but rarely
ever changed.  This patch changes this flag to a normal integer and protects it
with RCU locking.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Paul Moore 2006-11-17 17:38:44 -05:00 committed by David S. Miller
parent 1f758d9354
commit cd28786d6d
1 changed files with 21 additions and 7 deletions
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28
net/netlabel/netlabel_unlabeled.c
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@ -47,7 +47,8 @@
#include "netlabel_unlabeled.h"
/* Accept unlabeled packets flag */
static atomic_t netlabel_unlabel_accept_flg = ATOMIC_INIT(0);
static DEFINE_SPINLOCK(netlabel_unlabel_acceptflg_lock);
static u8 netlabel_unlabel_acceptflg = 0;
/* NetLabel Generic NETLINK CIPSOv4 family */
static struct genl_family netlbl_unlabel_gnl_family = {
@ -82,8 +83,12 @@ static void netlbl_unlabel_acceptflg_set(u8 value,
struct audit_buffer *audit_buf;
u8 old_val;
old_val = atomic_read(&netlabel_unlabel_accept_flg);
atomic_set(&netlabel_unlabel_accept_flg, value);
rcu_read_lock();
old_val = netlabel_unlabel_acceptflg;
spin_lock(&netlabel_unlabel_acceptflg_lock);
netlabel_unlabel_acceptflg = value;
spin_unlock(&netlabel_unlabel_acceptflg_lock);
rcu_read_unlock();
audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
audit_info);
@ -148,9 +153,11 @@ static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
goto list_failure;
}
rcu_read_lock();
ret_val = nla_put_u8(ans_skb,
NLBL_UNLABEL_A_ACPTFLG,
atomic_read(&netlabel_unlabel_accept_flg));
netlabel_unlabel_acceptflg);
rcu_read_unlock();
if (ret_val != 0)
goto list_failure;
@ -236,10 +243,17 @@ int netlbl_unlabel_genl_init(void)
*/
int netlbl_unlabel_getattr(struct netlbl_lsm_secattr *secattr)
{
if (atomic_read(&netlabel_unlabel_accept_flg) == 1)
return netlbl_secattr_init(secattr);
int ret_val;
return -ENOMSG;
rcu_read_lock();
if (netlabel_unlabel_acceptflg == 1) {
netlbl_secattr_init(secattr);
ret_val = 0;
} else
ret_val = -ENOMSG;
rcu_read_unlock();
return ret_val;
}
/**