/* SPDX-License-Identifier: GPL-2.0 */
/*
 * evm.h
 *
 * Copyright (c) 2009 IBM Corporation
 * Author: Mimi Zohar <[email protected]>
 */

#ifndef _LINUX_EVM_H
#define _LINUX_EVM_H

#include <linux/integrity.h>
#include <linux/xattr.h>

struct integrity_iint_cache;

#ifdef CONFIG_EVM
extern int evm_set_key(void *key, size_t keylen);
extern enum integrity_status evm_verifyxattr(struct dentry *dentry,
                         const char *xattr_name,
                         void *xattr_value,
                         size_t xattr_value_len,
                         struct integrity_iint_cache *iint);
extern int evm_inode_setattr(struct mnt_idmap *idmap,
                 struct dentry *dentry, struct iattr *attr);
extern void evm_inode_post_setattr(struct dentry *dentry, int ia_valid);
extern int evm_inode_setxattr(struct mnt_idmap *idmap,
                  struct dentry *dentry, const char *name,
                  const void *value, size_t size);
extern void evm_inode_post_setxattr(struct dentry *dentry,
                    const char *xattr_name,
                    const void *xattr_value,
                    size_t xattr_value_len);
extern int evm_inode_removexattr(struct mnt_idmap *idmap,
                 struct dentry *dentry, const char *xattr_name);
extern void evm_inode_post_removexattr(struct dentry *dentry,
                       const char *xattr_name);
static inline void evm_inode_post_remove_acl(struct mnt_idmap *idmap,
                         struct dentry *dentry,
                         const char *acl_name)
{
    evm_inode_post_removexattr(dentry, acl_name);
}
extern int evm_inode_set_acl(struct mnt_idmap *idmap,
                 struct dentry *dentry, const char *acl_name,
                 struct posix_acl *kacl);
static inline int evm_inode_remove_acl(struct mnt_idmap *idmap,
                       struct dentry *dentry,
                       const char *acl_name)
{
    return evm_inode_set_acl(idmap, dentry, acl_name, NULL);
}
static inline void evm_inode_post_set_acl(struct dentry *dentry,
                      const char *acl_name,
                      struct posix_acl *kacl)
{
    return evm_inode_post_setxattr(dentry, acl_name, NULL, 0);
}
extern int evm_inode_init_security(struct inode *inode,
                   const struct xattr *xattr_array,
                   struct xattr *evm);
extern bool evm_revalidate_status(const char *xattr_name);
extern int evm_protected_xattr_if_enabled(const char *req_xattr_name);
extern int evm_read_protected_xattrs(struct dentry *dentry, u8 *buffer,
                     int buffer_size, char type,
                     bool canonical_fmt);
#ifdef CONFIG_FS_POSIX_ACL
extern int posix_xattr_acl(const char *xattrname);
#else
static inline int posix_xattr_acl(const char *xattrname)
{
    return 0;
}
#endif
#else

static inline int evm_set_key(void *key, size_t keylen)
{
    return -EOPNOTSUPP;
}

#ifdef CONFIG_INTEGRITY
static inline enum integrity_status evm_verifyxattr(struct dentry *dentry,
                            const char *xattr_name,
                            void *xattr_value,
                            size_t xattr_value_len,
                    struct integrity_iint_cache *iint)
{
    return INTEGRITY_UNKNOWN;
}
#endif

static inline int evm_inode_setattr(struct mnt_idmap *idmap,
                    struct dentry *dentry, struct iattr *attr)
{
    return 0;
}

static inline void evm_inode_post_setattr(struct dentry *dentry, int ia_valid)
{
    return;
}

static inline int evm_inode_setxattr(struct mnt_idmap *idmap,
                     struct dentry *dentry, const char *name,
                     const void *value, size_t size)
{
    return 0;
}

static inline void evm_inode_post_setxattr(struct dentry *dentry,
                       const char *xattr_name,
                       const void *xattr_value,
                       size_t xattr_value_len)
{
    return;
}

static inline int evm_inode_removexattr(struct mnt_idmap *idmap,
                    struct dentry *dentry,
                    const char *xattr_name)
{
    return 0;
}

static inline void evm_inode_post_removexattr(struct dentry *dentry,
                          const char *xattr_name)
{
    return;
}

static inline void evm_inode_post_remove_acl(struct mnt_idmap *idmap,
                         struct dentry *dentry,
                         const char *acl_name)
{
    return;
}

static inline int evm_inode_set_acl(struct mnt_idmap *idmap,
                    struct dentry *dentry, const char *acl_name,
                    struct posix_acl *kacl)
{
    return 0;
}

static inline int evm_inode_remove_acl(struct mnt_idmap *idmap,
                       struct dentry *dentry,
                       const char *acl_name)
{
    return 0;
}

static inline void evm_inode_post_set_acl(struct dentry *dentry,
                      const char *acl_name,
                      struct posix_acl *kacl)
{
    return;
}

static inline int evm_inode_init_security(struct inode *inode,
                      const struct xattr *xattr_array,
                      struct xattr *evm)
{
    return 0;
}

static inline bool evm_revalidate_status(const char *xattr_name)
{
    return false;
}

static inline int evm_protected_xattr_if_enabled(const char *req_xattr_name)
{
    return false;
}

static inline int evm_read_protected_xattrs(struct dentry *dentry, u8 *buffer,
                        int buffer_size, char type,
                        bool canonical_fmt)
{
    return -EOPNOTSUPP;
}

#endif /* CONFIG_EVM */
#endif /* LINUX_EVM_H */