v4.19.13 snapshot.
diff --git a/security/selinux/include/avc.h b/security/selinux/include/avc.h
new file mode 100644
index 0000000..ef899bc
--- /dev/null
+++ b/security/selinux/include/avc.h
@@ -0,0 +1,195 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Access vector cache interface for object managers.
+ *
+ * Author : Stephen Smalley, <sds@tycho.nsa.gov>
+ */
+#ifndef _SELINUX_AVC_H_
+#define _SELINUX_AVC_H_
+
+#include <linux/stddef.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/kdev_t.h>
+#include <linux/spinlock.h>
+#include <linux/init.h>
+#include <linux/audit.h>
+#include <linux/lsm_audit.h>
+#include <linux/in6.h>
+#include "flask.h"
+#include "av_permissions.h"
+#include "security.h"
+
+/*
+ * An entry in the AVC.
+ */
+struct avc_entry;
+
+struct task_struct;
+struct inode;
+struct sock;
+struct sk_buff;
+
+/*
+ * AVC statistics
+ */
+struct avc_cache_stats {
+ unsigned int lookups;
+ unsigned int misses;
+ unsigned int allocations;
+ unsigned int reclaims;
+ unsigned int frees;
+};
+
+/*
+ * We only need this data after we have decided to send an audit message.
+ */
+struct selinux_audit_data {
+ u32 ssid;
+ u32 tsid;
+ u16 tclass;
+ u32 requested;
+ u32 audited;
+ u32 denied;
+ int result;
+ struct selinux_state *state;
+};
+
+/*
+ * AVC operations
+ */
+
+void __init avc_init(void);
+
+static inline u32 avc_audit_required(u32 requested,
+ struct av_decision *avd,
+ int result,
+ u32 auditdeny,
+ u32 *deniedp)
+{
+ u32 denied, audited;
+ denied = requested & ~avd->allowed;
+ if (unlikely(denied)) {
+ audited = denied & avd->auditdeny;
+ /*
+ * auditdeny is TRICKY! Setting a bit in
+ * this field means that ANY denials should NOT be audited if
+ * the policy contains an explicit dontaudit rule for that
+ * permission. Take notice that this is unrelated to the
+ * actual permissions that were denied. As an example lets
+ * assume:
+ *
+ * denied == READ
+ * avd.auditdeny & ACCESS == 0 (not set means explicit rule)
+ * auditdeny & ACCESS == 1
+ *
+ * We will NOT audit the denial even though the denied
+ * permission was READ and the auditdeny checks were for
+ * ACCESS
+ */
+ if (auditdeny && !(auditdeny & avd->auditdeny))
+ audited = 0;
+ } else if (result)
+ audited = denied = requested;
+ else
+ audited = requested & avd->auditallow;
+ *deniedp = denied;
+ return audited;
+}
+
+int slow_avc_audit(struct selinux_state *state,
+ u32 ssid, u32 tsid, u16 tclass,
+ u32 requested, u32 audited, u32 denied, int result,
+ struct common_audit_data *a,
+ unsigned flags);
+
+/**
+ * avc_audit - Audit the granting or denial of permissions.
+ * @ssid: source security identifier
+ * @tsid: target security identifier
+ * @tclass: target security class
+ * @requested: requested permissions
+ * @avd: access vector decisions
+ * @result: result from avc_has_perm_noaudit
+ * @a: auxiliary audit data
+ * @flags: VFS walk flags
+ *
+ * Audit the granting or denial of permissions in accordance
+ * with the policy. This function is typically called by
+ * avc_has_perm() after a permission check, but can also be
+ * called directly by callers who use avc_has_perm_noaudit()
+ * in order to separate the permission check from the auditing.
+ * For example, this separation is useful when the permission check must
+ * be performed under a lock, to allow the lock to be released
+ * before calling the auditing code.
+ */
+static inline int avc_audit(struct selinux_state *state,
+ u32 ssid, u32 tsid,
+ u16 tclass, u32 requested,
+ struct av_decision *avd,
+ int result,
+ struct common_audit_data *a,
+ int flags)
+{
+ u32 audited, denied;
+ audited = avc_audit_required(requested, avd, result, 0, &denied);
+ if (likely(!audited))
+ return 0;
+ return slow_avc_audit(state, ssid, tsid, tclass,
+ requested, audited, denied, result,
+ a, flags);
+}
+
+#define AVC_STRICT 1 /* Ignore permissive mode. */
+#define AVC_EXTENDED_PERMS 2 /* update extended permissions */
+int avc_has_perm_noaudit(struct selinux_state *state,
+ u32 ssid, u32 tsid,
+ u16 tclass, u32 requested,
+ unsigned flags,
+ struct av_decision *avd);
+
+int avc_has_perm(struct selinux_state *state,
+ u32 ssid, u32 tsid,
+ u16 tclass, u32 requested,
+ struct common_audit_data *auditdata);
+int avc_has_perm_flags(struct selinux_state *state,
+ u32 ssid, u32 tsid,
+ u16 tclass, u32 requested,
+ struct common_audit_data *auditdata,
+ int flags);
+
+int avc_has_extended_perms(struct selinux_state *state,
+ u32 ssid, u32 tsid, u16 tclass, u32 requested,
+ u8 driver, u8 perm, struct common_audit_data *ad);
+
+
+u32 avc_policy_seqno(struct selinux_state *state);
+
+#define AVC_CALLBACK_GRANT 1
+#define AVC_CALLBACK_TRY_REVOKE 2
+#define AVC_CALLBACK_REVOKE 4
+#define AVC_CALLBACK_RESET 8
+#define AVC_CALLBACK_AUDITALLOW_ENABLE 16
+#define AVC_CALLBACK_AUDITALLOW_DISABLE 32
+#define AVC_CALLBACK_AUDITDENY_ENABLE 64
+#define AVC_CALLBACK_AUDITDENY_DISABLE 128
+#define AVC_CALLBACK_ADD_XPERMS 256
+
+int avc_add_callback(int (*callback)(u32 event), u32 events);
+
+/* Exported to selinuxfs */
+struct selinux_avc;
+int avc_get_hash_stats(struct selinux_avc *avc, char *page);
+unsigned int avc_get_cache_threshold(struct selinux_avc *avc);
+void avc_set_cache_threshold(struct selinux_avc *avc,
+ unsigned int cache_threshold);
+
+/* Attempt to free avc node cache */
+void avc_disable(void);
+
+#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
+DECLARE_PER_CPU(struct avc_cache_stats, avc_cache_stats);
+#endif
+
+#endif /* _SELINUX_AVC_H_ */
+