Merge tag 'Smack-for-5.10' of git://github.com/cschaufler/smack-next

Pull smack updates from Casey Schaufler:
 "Two minor fixes and one performance enhancement to Smack. The
  performance improvement is significant and the new code is more like
  its counterpart in SELinux.

   - Two kernel test robot suggested clean-ups.

   - Teach Smack to use the IPv4 netlabel cache. This results in a
     12-14% improvement on TCP benchmarks"

* tag 'Smack-for-5.10' of git://github.com/cschaufler/smack-next:
  Smack: Remove unnecessary variable initialization
  Smack: Fix build when NETWORK_SECMARK is not set
  Smack: Use the netlabel cache
  Smack: Set socket labels only once
  Smack: Consolidate uses of secmark into a function

Author: torvalds

security/smack/smack.h

@@ -100,7 +100,12 @@ struct socket_smack {
 	struct smack_known	*smk_out;	/* outbound label */
 	struct smack_known	*smk_in;	/* inbound label */
 	struct smack_known	*smk_packet;	/* TCP peer label */
+	int			smk_state;	/* netlabel socket states */
 };
+#define	SMK_NETLBL_UNSET	0
+#define	SMK_NETLBL_UNLABELED	1
+#define	SMK_NETLBL_LABELED	2
+#define	SMK_NETLBL_REQSKB	3
 
 /*
  * Inode smack data
@@ -196,19 +201,6 @@ enum {
 #define SMACK_DELETE_OPTION	"-DELETE"
 #define SMACK_CIPSO_OPTION 	"-CIPSO"
 
-/*
- * How communications on this socket are treated.
- * Usually it's determined by the underlying netlabel code
- * but there are certain cases, including single label hosts
- * and potentially single label interfaces for which the
- * treatment can not be known in advance.
- *
- * The possibility of additional labeling schemes being
- * introduced in the future exists as well.
- */
-#define SMACK_UNLABELED_SOCKET	0
-#define SMACK_CIPSO_SOCKET	1
-
 /*
  * CIPSO defaults.
  */
@@ -305,6 +297,7 @@ struct smack_known *smk_find_entry(const char *);
 bool smack_privileged(int cap);
 bool smack_privileged_cred(int cap, const struct cred *cred);
 void smk_destroy_label_list(struct list_head *list);
+int smack_populate_secattr(struct smack_known *skp);
 
 /*
  * Shared data.

security/smack/smack_access.c

@@ -510,6 +510,42 @@ int smk_netlbl_mls(int level, char *catset, struct netlbl_lsm_secattr *sap,
 	return 0;
 }
 
+/**
+ * smack_populate_secattr - fill in the smack_known netlabel information
+ * @skp: pointer to the structure to fill
+ *
+ * Populate the netlabel secattr structure for a Smack label.
+ *
+ * Returns 0 unless creating the category mapping fails
+ */
+int smack_populate_secattr(struct smack_known *skp)
+{
+	int slen;
+
+	skp->smk_netlabel.attr.secid = skp->smk_secid;
+	skp->smk_netlabel.domain = skp->smk_known;
+	skp->smk_netlabel.cache = netlbl_secattr_cache_alloc(GFP_ATOMIC);
+	if (skp->smk_netlabel.cache != NULL) {
+		skp->smk_netlabel.flags |= NETLBL_SECATTR_CACHE;
+		skp->smk_netlabel.cache->free = NULL;
+		skp->smk_netlabel.cache->data = skp;
+	}
+	skp->smk_netlabel.flags |= NETLBL_SECATTR_SECID |
+				   NETLBL_SECATTR_MLS_LVL |
+				   NETLBL_SECATTR_DOMAIN;
+	/*
+	 * If direct labeling works use it.
+	 * Otherwise use mapped labeling.
+	 */
+	slen = strlen(skp->smk_known);
+	if (slen < SMK_CIPSOLEN)
+		return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
+				      &skp->smk_netlabel, slen);
+
+	return smk_netlbl_mls(smack_cipso_mapped, (char *)&skp->smk_secid,
+			      &skp->smk_netlabel, sizeof(skp->smk_secid));
+}
+
 /**
  * smk_import_entry - import a label, return the list entry
  * @string: a text string that might be a Smack label
@@ -523,7 +559,6 @@ struct smack_known *smk_import_entry(const char *string, int len)
 {
 	struct smack_known *skp;
 	char *smack;
-	int slen;
 	int rc;
 
 	smack = smk_parse_smack(string, len);
@@ -544,21 +579,8 @@ struct smack_known *smk_import_entry(const char *string, int len)
 
 	skp->smk_known = smack;
 	skp->smk_secid = smack_next_secid++;
-	skp->smk_netlabel.domain = skp->smk_known;
-	skp->smk_netlabel.flags =
-		NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
-	/*
-	 * If direct labeling works use it.
-	 * Otherwise use mapped labeling.
-	 */
-	slen = strlen(smack);
-	if (slen < SMK_CIPSOLEN)
-		rc = smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
-			       &skp->smk_netlabel, slen);
-	else
-		rc = smk_netlbl_mls(smack_cipso_mapped, (char *)&skp->smk_secid,
-			       &skp->smk_netlabel, sizeof(skp->smk_secid));
 
+	rc = smack_populate_secattr(skp);
 	if (rc >= 0) {
 		INIT_LIST_HEAD(&skp->smk_rules);
 		mutex_init(&skp->smk_rules_lock);
@@ -569,9 +591,6 @@ struct smack_known *smk_import_entry(const char *string, int len)
 		smk_insert_entry(skp);
 		goto unlockout;
 	}
-	/*
-	 * smk_netlbl_mls failed.
-	 */
 	kfree(skp);
 	skp = ERR_PTR(rc);
 freeout: