2 * lxc: linux Container library
4 * (C) Copyright IBM Corp. 2007, 2008
7 * Daniel Lezcano <daniel.lezcano at free.fr>
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #include <linux/magic.h>
31 #include <netinet/in.h>
34 #include <sys/param.h>
35 #include <sys/types.h>
41 #include "lxcseccomp.h"
46 #if HAVE_SYS_RESOURCE_H
47 #include <sys/resource.h>
50 #if HAVE_SCMP_FILTER_CTX
51 typedef void * scmp_filter_ctx
;
54 /* worth moving to configure.ac? */
55 #define subuidfile "/etc/subuid"
56 #define subgidfile "/etc/subgid"
59 * Defines a generic struct to configure the control group. It is up to the
60 * programmer to specify the right subsystem.
61 * @subsystem : the targeted subsystem
62 * @value : the value to set
63 * @version : The version of the cgroup filesystem on which the controller
66 * @controllers : The controllers to use for this container.
67 * @dir : The name of the directory containing the container's cgroup.
68 * Not that this is a per-container setting.
72 /* information about a specific controller */
73 struct /* controller */ {
79 /* meta information about cgroup configuration */
88 #if !HAVE_SYS_RESOURCE_H
89 #define RLIM_INFINITY ((unsigned long)-1)
91 unsigned long rlim_cur
;
92 unsigned long rlim_max
;
97 * Defines a structure to configure resource limits to set via setrlimit().
98 * @resource : the resource name in lowercase without the RLIMIT_ prefix
99 * @limit : the limit to set
112 * Defines a structure to configure kernel parameters at runtime.
113 * @key : the kernel parameters will be configured without the "lxc.sysctl" prefix
114 * @value : the value to set
122 * Defines a structure to configure proc filesystem at runtime.
123 * @filename : the proc filesystem will be configured without the "lxc.proc" prefix
124 * @value : the value to set
132 * id_map is an id map entry. Form in confile is:
133 * lxc.idmap = u 0 9800 100
134 * lxc.idmap = u 1000 9900 100
135 * lxc.idmap = g 0 9800 100
136 * lxc.idmap = g 1000 9900 100
137 * meaning the container can use uids and gids 0-99 and 1000-1099,
138 * with [ug]id 0 mapping to [ug]id 9800 on the host, and [ug]id 1000 to
139 * [ug]id 9900 on the host.
143 unsigned long hostid
, nsid
, range
;
146 /* Defines the number of tty configured and contains the
148 * @max = number of configured ttys
150 struct lxc_tty_info
{
154 struct lxc_terminal_info
*tty
;
157 /* Defines a structure to store the rootfs location, the
158 * optionals pivot_root, rootfs mount paths
159 * @path : the rootfs source (directory or device)
160 * @mount : where it is mounted
161 * @bev_type : optional backing store type
162 * @options : mount options
163 * @mountflags : the portion of @options that are flags
164 * @data : the portion of @options that are not flags
165 * @managed : whether it is managed by LXC
172 unsigned long mountflags
;
178 * Automatic mounts for LXC to perform inside the container
181 LXC_AUTO_PROC_RW
= 0x001, /* /proc read-write */
182 LXC_AUTO_PROC_MIXED
= 0x002, /* /proc/sys and /proc/sysrq-trigger read-only */
183 LXC_AUTO_PROC_MASK
= 0x003,
185 LXC_AUTO_SYS_RW
= 0x004, /* /sys */
186 LXC_AUTO_SYS_RO
= 0x008, /* /sys read-only */
187 LXC_AUTO_SYS_MIXED
= 0x00C, /* /sys read-only and /sys/class/net read-write */
188 LXC_AUTO_SYS_MASK
= 0x00C,
190 LXC_AUTO_CGROUP_RO
= 0x010, /* /sys/fs/cgroup (partial mount, read-only) */
191 LXC_AUTO_CGROUP_RW
= 0x020, /* /sys/fs/cgroup (partial mount, read-write) */
192 LXC_AUTO_CGROUP_MIXED
= 0x030, /* /sys/fs/cgroup (partial mount, paths r/o, cgroup r/w) */
193 LXC_AUTO_CGROUP_FULL_RO
= 0x040, /* /sys/fs/cgroup (full mount, read-only) */
194 LXC_AUTO_CGROUP_FULL_RW
= 0x050, /* /sys/fs/cgroup (full mount, read-write) */
195 LXC_AUTO_CGROUP_FULL_MIXED
= 0x060, /* /sys/fs/cgroup (full mount, parent r/o, own r/w) */
197 * These are defined in such a way as to retain binary compatibility
198 * with earlier versions of this code. If the previous mask is applied,
199 * both of these will default back to the _MIXED variants, which is
202 LXC_AUTO_CGROUP_NOSPEC
= 0x0B0, /* /sys/fs/cgroup (partial mount, r/w or mixed, depending on caps) */
203 LXC_AUTO_CGROUP_FULL_NOSPEC
= 0x0E0, /* /sys/fs/cgroup (full mount, r/w or mixed, depending on caps) */
204 LXC_AUTO_CGROUP_FORCE
= 0x100, /* mount cgroups even when cgroup namespaces are supported */
205 LXC_AUTO_CGROUP_MASK
= 0x1F0, /* all known cgroup options, doe not contain LXC_AUTO_CGROUP_FORCE */
207 LXC_AUTO_SHMOUNTS
= 0x200, /* shared mount point */
208 LXC_AUTO_SHMOUNTS_MASK
= 0x200, /* shared mount point mask */
209 LXC_AUTO_ALL_MASK
= 0x1FF, /* all known settings */
226 extern char *lxchook_names
[NUM_LXC_HOOKS
];
228 struct lxc_state_client
{
230 lxc_state_t states
[MAX_STATE
];
234 /* Pointer to the name of the container. Do not free! */
238 signed long personality
;
239 struct utsname
*utsname
;
242 struct lxc_list cgroup
;
243 struct lxc_list cgroup2
;
247 struct lxc_list id_map
;
250 * Pointer to the idmap entry for the container's root uid in
251 * the id_map list. Do not free!
253 const struct id_map
*root_nsuid_map
;
256 * Pointer to the idmap entry for the container's root gid in
257 * the id_map list. Do not free!
259 const struct id_map
*root_nsgid_map
;
262 struct lxc_list network
;
267 struct lxc_list mount_list
;
270 struct lxc_list caps
;
271 struct lxc_list keepcaps
;
273 /* /dev/tty<idx> devices */
274 struct lxc_tty_info ttys
;
275 /* /dev/console device */
276 struct lxc_terminal console
;
277 /* maximum pty devices allowed by devpts mount */
280 /* set to true when rootfs has been setup */
282 struct lxc_rootfs rootfs
;
287 unsigned int hooks_version
;
288 struct lxc_list hooks
[NUM_LXC_HOOKS
];
291 char *lsm_aa_profile
;
292 char *lsm_aa_profile_computed
;
293 bool lsm_aa_profile_created
;
294 unsigned int lsm_aa_allow_nesting
;
295 unsigned int lsm_aa_allow_incomplete
;
296 struct lxc_list lsm_aa_raw
;
297 char *lsm_se_context
;
298 bool tmp_umount_proc
;
299 struct lxc_seccomp seccomp
;
301 unsigned int autodev
; /* if 1, mount and fill a /dev at start */
302 int haltsignal
; /* signal used to halt container */
303 int rebootsignal
; /* signal used to reboot container */
304 int stopsignal
; /* signal used to hard stop container */
305 char *rcfile
; /* Copy of the top level rcfile we read */
307 /* Logfile and loglevel can be set in a container config file. Those
308 * function as defaults. The defaults can be overridden by command line.
309 * However we don't want the command line specified values to be saved
310 * on c->save_config(). So we store the config file specified values
312 char *logfile
; /* the logfile as specified in config */
313 int loglevel
; /* loglevel as specified in config (if any) */
316 unsigned int start_auto
;
317 unsigned int start_delay
;
319 struct lxc_list groups
;
322 /* unshare the mount namespace in the monitor */
323 unsigned int monitor_unshare
;
324 unsigned int monitor_signal_pdeath
;
326 /* list of included files */
327 struct lxc_list includes
;
328 /* config entries which are not "lxc.*" are aliens */
329 struct lxc_list aliens
;
331 /* list of environment variables we'll add to the container when
333 struct lxc_list environment
;
335 /* text representation of the config file */
336 char *unexpanded_config
;
337 size_t unexpanded_len
;
338 size_t unexpanded_alloced
;
340 /* default command for lxc-execute */
346 /* if running in a new user namespace, the UID/GID that init and COMMAND
347 * should run under when using lxc-execute */
351 /* indicator if the container will be destroyed on shutdown */
352 unsigned int ephemeral
;
354 /* The facility to pass to syslog. Let's users establish as what type of
355 * program liblxc is supposed to write to the syslog. */
358 /* Whether PR_SET_NO_NEW_PRIVS will be set for the container. */
361 /* RLIMIT_* limits */
362 struct lxc_list limits
;
364 /* Contains generic info about the cgroup configuration for this
365 * container. Note that struct lxc_cgroup contains a union. It is only
366 * valid to access the members of the anonymous "meta" struct within
369 struct lxc_cgroup cgroup_meta
;
374 char *ns_share
[LXC_NS_MAX
];
377 /* init working directory */
380 /* A list of clients registered to be informed about a container state. */
381 struct lxc_list state_clients
;
384 struct lxc_list sysctls
;
387 struct lxc_list procs
;
390 /* Absolute path to the shared mount point on the host */
392 /* Absolute path (in the container) to the shared mount point */
397 extern int write_id_mapping(enum idtype idtype
, pid_t pid
, const char *buf
,
401 extern thread_local
struct lxc_conf
*current_config
;
403 extern struct lxc_conf
*current_config
;
406 extern int run_lxc_hooks(const char *name
, char *hook
, struct lxc_conf
*conf
,
408 extern int detect_shared_rootfs(void);
409 extern struct lxc_conf
*lxc_conf_init(void);
410 extern void lxc_conf_free(struct lxc_conf
*conf
);
411 extern int pin_rootfs(const char *rootfs
);
412 extern int lxc_map_ids(struct lxc_list
*idmap
, pid_t pid
);
413 extern int lxc_create_tty(const char *name
, struct lxc_conf
*conf
);
414 extern void lxc_delete_tty(struct lxc_tty_info
*ttys
);
415 extern int lxc_clear_config_caps(struct lxc_conf
*c
);
416 extern int lxc_clear_config_keepcaps(struct lxc_conf
*c
);
417 extern int lxc_clear_cgroups(struct lxc_conf
*c
, const char *key
, int version
);
418 extern int lxc_clear_mount_entries(struct lxc_conf
*c
);
419 extern int lxc_clear_automounts(struct lxc_conf
*c
);
420 extern int lxc_clear_hooks(struct lxc_conf
*c
, const char *key
);
421 extern int lxc_clear_idmaps(struct lxc_conf
*c
);
422 extern int lxc_clear_groups(struct lxc_conf
*c
);
423 extern int lxc_clear_environment(struct lxc_conf
*c
);
424 extern int lxc_clear_limits(struct lxc_conf
*c
, const char *key
);
425 extern int lxc_delete_autodev(struct lxc_handler
*handler
);
426 extern void lxc_clear_includes(struct lxc_conf
*conf
);
427 extern int lxc_setup_rootfs_prepare_root(struct lxc_conf
*conf
,
428 const char *name
, const char *lxcpath
);
429 extern int lxc_setup(struct lxc_handler
*handler
);
430 extern int lxc_setup_parent(struct lxc_handler
*handler
);
431 extern int setup_resource_limits(struct lxc_list
*limits
, pid_t pid
);
432 extern int find_unmapped_nsid(struct lxc_conf
*conf
, enum idtype idtype
);
433 extern int mapped_hostid(unsigned id
, struct lxc_conf
*conf
,
435 extern int chown_mapped_root(const char *path
, struct lxc_conf
*conf
);
436 extern int userns_exec_1(struct lxc_conf
*conf
, int (*fn
)(void *), void *data
,
437 const char *fn_name
);
438 extern int userns_exec_full(struct lxc_conf
*conf
, int (*fn
)(void *),
439 void *data
, const char *fn_name
);
440 extern int parse_mntopts(const char *mntopts
, unsigned long *mntflags
,
442 extern int parse_propagationopts(const char *mntopts
, unsigned long *pflags
);
443 extern void tmp_proc_unmount(struct lxc_conf
*lxc_conf
);
444 extern void remount_all_slave(void);
445 extern void suggest_default_idmap(void);
446 extern FILE *make_anonymous_mount_file(struct lxc_list
*mount
,
447 bool include_nesting_helpers
);
448 extern struct lxc_list
*sort_cgroup_settings(struct lxc_list
*cgroup_settings
);
449 extern unsigned long add_required_remount_flags(const char *s
, const char *d
,
450 unsigned long flags
);
451 extern int run_script(const char *name
, const char *section
, const char *script
,
453 extern int run_script_argv(const char *name
, unsigned int hook_version
,
454 const char *section
, const char *script
,
455 const char *hookname
, char **argsin
);
456 extern int in_caplist(int cap
, struct lxc_list
*caps
);
457 extern int setup_sysctl_parameters(struct lxc_list
*sysctls
);
458 extern int lxc_clear_sysctls(struct lxc_conf
*c
, const char *key
);
459 extern int setup_proc_filesystem(struct lxc_list
*procs
, pid_t pid
);
460 extern int lxc_clear_procs(struct lxc_conf
*c
, const char *key
);
461 extern int lxc_clear_apparmor_raw(struct lxc_conf
*c
);
462 extern int lxc_clear_namespace(struct lxc_conf
*c
);
464 #endif /* __LXC_CONF_H */