1 files changed, 63 insertions, 0 deletions
diff --git a/security/selinux/ss/constraint.h b/security/selinux/ss/constraint.h
new file mode 100644
index 000000000..4e563be9e
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+++ b/security/selinux/ss/constraint.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * A constraint is a condition that must be satisfied in
+ * order for one or more permissions to be granted.
+ * Constraints are used to impose additional restrictions
+ * beyond the type-based rules in `te' or the role-based
+ * transition rules in `rbac'.  Constraints are typically
+ * used to prevent a process from transitioning to a new user
+ * identity or role unless it is in a privileged type.
+ * Constraints are likewise typically used to prevent a
+ * process from labeling an object with a different user
+ * identity.
+ *
+ * Author : Stephen Smalley, <sds@tycho.nsa.gov>
+ */
+#ifndef _SS_CONSTRAINT_H_
+#define _SS_CONSTRAINT_H_
+
+#include "ebitmap.h"
+
+#define CEXPR_MAXDEPTH 5
+
+struct constraint_expr {
+#define CEXPR_NOT		1 /* not expr */
+#define CEXPR_AND		2 /* expr and expr */
+#define CEXPR_OR		3 /* expr or expr */
+#define CEXPR_ATTR		4 /* attr op attr */
+#define CEXPR_NAMES		5 /* attr op names */
+	u32 expr_type;		/* expression type */
+
+#define CEXPR_USER 1		/* user */
+#define CEXPR_ROLE 2		/* role */
+#define CEXPR_TYPE 4		/* type */
+#define CEXPR_TARGET 8		/* target if set, source otherwise */
+#define CEXPR_XTARGET 16	/* special 3rd target for validatetrans rule */
+#define CEXPR_L1L2 32		/* low level 1 vs. low level 2 */
+#define CEXPR_L1H2 64		/* low level 1 vs. high level 2 */
+#define CEXPR_H1L2 128		/* high level 1 vs. low level 2 */
+#define CEXPR_H1H2 256		/* high level 1 vs. high level 2 */
+#define CEXPR_L1H1 512		/* low level 1 vs. high level 1 */
+#define CEXPR_L2H2 1024		/* low level 2 vs. high level 2 */
+	u32 attr;		/* attribute */
+
+#define CEXPR_EQ     1		/* == or eq */
+#define CEXPR_NEQ    2		/* != */
+#define CEXPR_DOM    3		/* dom */
+#define CEXPR_DOMBY  4		/* domby  */
+#define CEXPR_INCOMP 5		/* incomp */
+	u32 op;			/* operator */
+
+	struct ebitmap names;	/* names */
+	struct type_set *type_names;
+
+	struct constraint_expr *next;   /* next expression */
+};
+
+struct constraint_node {
+	u32 permissions;	/* constrained permissions */
+	struct constraint_expr *expr;	/* constraint on permissions */
+	struct constraint_node *next;	/* next constraint */
+};
+
+#endif	/* _SS_CONSTRAINT_H_ */