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-rw-r--r--net/netlabel/netlabel_cipso_v4.c5
-rw-r--r--net/netlabel/netlabel_kapi.c21
-rw-r--r--net/netlabel/netlabel_mgmt.c65
-rw-r--r--net/netlabel/netlabel_mgmt.h5
4 files changed, 96 insertions, 0 deletions
diff --git a/net/netlabel/netlabel_cipso_v4.c b/net/netlabel/netlabel_cipso_v4.c
index 24b660f16ce3..c060e3f991f1 100644
--- a/net/netlabel/netlabel_cipso_v4.c
+++ b/net/netlabel/netlabel_cipso_v4.c
@@ -41,6 +41,7 @@
#include "netlabel_user.h"
#include "netlabel_cipso_v4.h"
+#include "netlabel_mgmt.h"
/* Argument struct for cipso_v4_doi_walk() */
struct netlbl_cipsov4_doiwalk_arg {
@@ -419,6 +420,8 @@ static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
ret_val = netlbl_cipsov4_add_pass(info);
break;
}
+ if (ret_val == 0)
+ netlbl_mgmt_protocount_inc();
audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_ADD,
&audit_info);
@@ -694,6 +697,8 @@ static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
ret_val = cipso_v4_doi_remove(doi,
&audit_info,
netlbl_cipsov4_doi_free);
+ if (ret_val == 0)
+ netlbl_mgmt_protocount_dec();
audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_DEL,
&audit_info);
diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index b165712aaa70..4f50949722a9 100644
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -38,6 +38,7 @@
#include "netlabel_domainhash.h"
#include "netlabel_unlabeled.h"
#include "netlabel_user.h"
+#include "netlabel_mgmt.h"
/*
* Security Attribute Functions
@@ -245,6 +246,26 @@ int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
*/
/**
+ * netlbl_enabled - Determine if the NetLabel subsystem is enabled
+ *
+ * Description:
+ * The LSM can use this function to determine if it should use NetLabel
+ * security attributes in it's enforcement mechanism. Currently, NetLabel is
+ * considered to be enabled when it's configuration contains a valid setup for
+ * at least one labeled protocol (i.e. NetLabel can understand incoming
+ * labeled packets of at least one type); otherwise NetLabel is considered to
+ * be disabled.
+ *
+ */
+int netlbl_enabled(void)
+{
+ /* At some point we probably want to expose this mechanism to the user
+ * as well so that admins can toggle NetLabel regardless of the
+ * configuration */
+ return (netlbl_mgmt_protocount_value() > 0 ? 1 : 0);
+}
+
+/**
* netlbl_socket_setattr - Label a socket using the correct protocol
* @sk: the socket to label
* @secattr: the security attributes
diff --git a/net/netlabel/netlabel_mgmt.c b/net/netlabel/netlabel_mgmt.c
index e00fc219c72b..5315dacc5222 100644
--- a/net/netlabel/netlabel_mgmt.c
+++ b/net/netlabel/netlabel_mgmt.c
@@ -42,6 +42,10 @@
#include "netlabel_user.h"
#include "netlabel_mgmt.h"
+/* NetLabel configured protocol count */
+static DEFINE_SPINLOCK(netlabel_mgmt_protocount_lock);
+static u32 netlabel_mgmt_protocount = 0;
+
/* Argument struct for netlbl_domhsh_walk() */
struct netlbl_domhsh_walk_arg {
struct netlink_callback *nl_cb;
@@ -67,6 +71,67 @@ static const struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
};
/*
+ * NetLabel Misc Managment Functions
+ */
+
+/**
+ * netlbl_mgmt_protocount_inc - Increment the configured labeled protocol count
+ *
+ * Description:
+ * Increment the number of labeled protocol configurations in the current
+ * NetLabel configuration. Keep track of this for use in determining if
+ * NetLabel label enforcement should be active/enabled or not in the LSM.
+ *
+ */
+void netlbl_mgmt_protocount_inc(void)
+{
+ rcu_read_lock();
+ spin_lock(&netlabel_mgmt_protocount_lock);
+ netlabel_mgmt_protocount++;
+ spin_unlock(&netlabel_mgmt_protocount_lock);
+ rcu_read_unlock();
+}
+
+/**
+ * netlbl_mgmt_protocount_dec - Decrement the configured labeled protocol count
+ *
+ * Description:
+ * Decrement the number of labeled protocol configurations in the current
+ * NetLabel configuration. Keep track of this for use in determining if
+ * NetLabel label enforcement should be active/enabled or not in the LSM.
+ *
+ */
+void netlbl_mgmt_protocount_dec(void)
+{
+ rcu_read_lock();
+ spin_lock(&netlabel_mgmt_protocount_lock);
+ if (netlabel_mgmt_protocount > 0)
+ netlabel_mgmt_protocount--;
+ spin_unlock(&netlabel_mgmt_protocount_lock);
+ rcu_read_unlock();
+}
+
+/**
+ * netlbl_mgmt_protocount_value - Return the number of configured protocols
+ *
+ * Description:
+ * Return the number of labeled protocols in the current NetLabel
+ * configuration. This value is useful in determining if NetLabel label
+ * enforcement should be active/enabled or not in the LSM.
+ *
+ */
+u32 netlbl_mgmt_protocount_value(void)
+{
+ u32 val;
+
+ rcu_read_lock();
+ val = netlabel_mgmt_protocount;
+ rcu_read_unlock();
+
+ return val;
+}
+
+/*
* NetLabel Command Handlers
*/
diff --git a/net/netlabel/netlabel_mgmt.h b/net/netlabel/netlabel_mgmt.h
index 3642d3bfc8eb..ccb2b3923591 100644
--- a/net/netlabel/netlabel_mgmt.h
+++ b/net/netlabel/netlabel_mgmt.h
@@ -168,4 +168,9 @@ enum {
/* NetLabel protocol functions */
int netlbl_mgmt_genl_init(void);
+/* NetLabel misc management functions */
+void netlbl_mgmt_protocount_inc(void);
+void netlbl_mgmt_protocount_dec(void);
+u32 netlbl_mgmt_protocount_value(void);
+
#endif