Merge tag 'nfs-for-4.15-1' of git://git.linux-nfs.org/projects/anna/linux-nfs

[linux-2.6-microblaze.git] / include / linux / device_cgroup.h

diff --git a/include/linux/device_cgroup.h b/include/linux/device_cgroup.h
index cdbc344..8557efe 100644 (file)
--- a/include/linux/device_cgroup.h
+++ b/include/linux/device_cgroup.h
@@ -1,17 +1,76 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #include <linux/fs.h>
+#include <linux/bpf-cgroup.h>
+
+#define DEVCG_ACC_MKNOD 1
+#define DEVCG_ACC_READ  2
+#define DEVCG_ACC_WRITE 4
+#define DEVCG_ACC_MASK (DEVCG_ACC_MKNOD | DEVCG_ACC_READ | DEVCG_ACC_WRITE)
+
+#define DEVCG_DEV_BLOCK 1
+#define DEVCG_DEV_CHAR  2
+#define DEVCG_DEV_ALL   4  /* this represents all devices */
 
 #ifdef CONFIG_CGROUP_DEVICE
-extern int __devcgroup_inode_permission(struct inode *inode, int mask);
-extern int devcgroup_inode_mknod(int mode, dev_t dev);
+extern int __devcgroup_check_permission(short type, u32 major, u32 minor,
+                                       short access);
+#else
+static inline int __devcgroup_check_permission(short type, u32 major, u32 minor,
+                                              short access)
+{ return 0; }
+#endif
+
+#if defined(CONFIG_CGROUP_DEVICE) || defined(CONFIG_CGROUP_BPF)
+static inline int devcgroup_check_permission(short type, u32 major, u32 minor,
+                                            short access)
+{
+       int rc = BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type, major, minor, access);
+
+       if (rc)
+               return -EPERM;
+
+       return __devcgroup_check_permission(type, major, minor, access);
+}
+
 static inline int devcgroup_inode_permission(struct inode *inode, int mask)
 {
+       short type, access = 0;
+
        if (likely(!inode->i_rdev))
                return 0;
-       if (!S_ISBLK(inode->i_mode) && !S_ISCHR(inode->i_mode))
+
+       if (S_ISBLK(inode->i_mode))
+               type = DEVCG_DEV_BLOCK;
+       else if (S_ISCHR(inode->i_mode))
+               type = DEVCG_DEV_CHAR;
+       else
+               return 0;
+
+       if (mask & MAY_WRITE)
+               access |= DEVCG_ACC_WRITE;
+       if (mask & MAY_READ)
+               access |= DEVCG_ACC_READ;
+
+       return devcgroup_check_permission(type, imajor(inode), iminor(inode),
+                                         access);
+}
+
+static inline int devcgroup_inode_mknod(int mode, dev_t dev)
+{
+       short type;
+
+       if (!S_ISBLK(mode) && !S_ISCHR(mode))
                return 0;
-       return __devcgroup_inode_permission(inode, mask);
+
+       if (S_ISBLK(mode))
+               type = DEVCG_DEV_BLOCK;
+       else
+               type = DEVCG_DEV_CHAR;
+
+       return devcgroup_check_permission(type, MAJOR(dev), MINOR(dev),
+                                         DEVCG_ACC_MKNOD);
 }
+
 #else
 static inline int devcgroup_inode_permission(struct inode *inode, int mask)
 { return 0; }