1 /* SPDX-License-Identifier: LGPL-2.1-or-later */ 2 #pragma once 3 4 #include <stdbool.h> 5 6 #include "cgroup-util.h" 7 #include "volatile-util.h" 8 9 typedef enum MountSettingsMask { 10 MOUNT_FATAL = 1 << 0, /* if set, a mount error is considered fatal */ 11 MOUNT_USE_USERNS = 1 << 1, /* if set, mounts are patched considering uid/gid shifts in a user namespace */ 12 MOUNT_IN_USERNS = 1 << 2, /* if set, the mount is executed in the inner child, otherwise in the outer child */ 13 MOUNT_APPLY_APIVFS_RO = 1 << 3, /* if set, /proc/sys, and /sys will be mounted read-only, otherwise read-write. */ 14 MOUNT_APPLY_APIVFS_NETNS = 1 << 4, /* if set, /proc/sys/net will be mounted read-write. 15 Works only if MOUNT_APPLY_APIVFS_RO is also set. */ 16 MOUNT_APPLY_TMPFS_TMP = 1 << 5, /* if set, /tmp will be mounted as tmpfs */ 17 MOUNT_ROOT_ONLY = 1 << 6, /* if set, only root mounts are mounted */ 18 MOUNT_NON_ROOT_ONLY = 1 << 7, /* if set, only non-root mounts are mounted */ 19 MOUNT_MKDIR = 1 << 8, /* if set, make directory to mount over first */ 20 MOUNT_TOUCH = 1 << 9, /* if set, touch file to mount over first */ 21 MOUNT_PREFIX_ROOT = 1 << 10,/* if set, prefix the source path with the container's root directory */ 22 MOUNT_FOLLOW_SYMLINKS = 1 << 11,/* if set, we'll follow symlinks for the mount target */ 23 } MountSettingsMask; 24 25 typedef enum CustomMountType { 26 CUSTOM_MOUNT_BIND, 27 CUSTOM_MOUNT_TMPFS, 28 CUSTOM_MOUNT_OVERLAY, 29 CUSTOM_MOUNT_INACCESSIBLE, 30 CUSTOM_MOUNT_ARBITRARY, 31 _CUSTOM_MOUNT_TYPE_MAX, 32 _CUSTOM_MOUNT_TYPE_INVALID = -EINVAL, 33 } CustomMountType; 34 35 typedef struct CustomMount { 36 CustomMountType type; 37 bool read_only; 38 char *source; /* for overlayfs this is the upper directory */ 39 char *destination; 40 char *options; 41 char *work_dir; 42 char **lower; 43 char *rm_rf_tmpdir; 44 char *type_argument; /* only for CUSTOM_MOUNT_ARBITRARY */ 45 bool graceful; 46 bool in_userns; 47 } CustomMount; 48 49 CustomMount* custom_mount_add(CustomMount **l, size_t *n, CustomMountType t); 50 void custom_mount_free_all(CustomMount *l, size_t n); 51 int custom_mount_prepare_all(const char *dest, CustomMount *l, size_t n); 52 53 int bind_mount_parse(CustomMount **l, size_t *n, const char *s, bool read_only); 54 int tmpfs_mount_parse(CustomMount **l, size_t *n, const char *s); 55 int overlay_mount_parse(CustomMount **l, size_t *n, const char *s, bool read_only); 56 int inaccessible_mount_parse(CustomMount **l, size_t *n, const char *s); 57 58 int mount_all(const char *dest, MountSettingsMask mount_settings, uid_t uid_shift, const char *selinux_apifs_context); 59 int mount_sysfs(const char *dest, MountSettingsMask mount_settings); 60 61 int mount_custom(const char *dest, CustomMount *mounts, size_t n, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context, MountSettingsMask mount_settings); 62 bool has_custom_root_mount(const CustomMount *mounts, size_t n); 63 64 int setup_volatile_mode(const char *directory, VolatileMode mode, uid_t uid_shift, const char *selinux_apifs_context); 65 66 int pivot_root_parse(char **pivot_root_new, char **pivot_root_old, const char *s); 67 int setup_pivot_root(const char *directory, const char *pivot_root_new, const char *pivot_root_old); 68 69 int tmpfs_patch_options(const char *options,uid_t uid_shift, const char *selinux_apifs_context, char **ret); 70