1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
6 This file is part of systemd.
8 Copyright 2010 Lennart Poettering
10 systemd is free software; you can redistribute it and/or modify it
11 under the terms of the GNU Lesser General Public License as published by
12 the Free Software Foundation; either version 2.1 of the License, or
13 (at your option) any later version.
15 systemd is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Lesser General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 /* Missing glibc definitions to access certain kernel APIs */
26 #include <sys/resource.h>
27 #include <sys/syscall.h>
32 #include <linux/oom.h>
33 #include <linux/input.h>
34 #include <linux/if_link.h>
35 #include <linux/loop.h>
36 #include <linux/audit.h>
37 #include <linux/capability.h>
44 #include <asm/sgidefs.h>
47 #ifdef HAVE_LINUX_BTRFS_H
48 #include <linux/btrfs.h>
54 #define RLIMIT_RTTIME 15
57 /* If RLIMIT_RTTIME is not defined, then we cannot use RLIMIT_NLIMITS as is */
58 #define _RLIMIT_MAX (RLIMIT_RTTIME+1 > RLIMIT_NLIMITS ? RLIMIT_RTTIME+1 : RLIMIT_NLIMITS)
60 #ifndef F_LINUX_SPECIFIC_BASE
61 #define F_LINUX_SPECIFIC_BASE 1024
65 #define F_SETPIPE_SZ (F_LINUX_SPECIFIC_BASE + 7)
69 #define F_GETPIPE_SZ (F_LINUX_SPECIFIC_BASE + 8)
73 #define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
74 #define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
76 #define F_SEAL_SEAL 0x0001 /* prevent further seals from being set */
77 #define F_SEAL_SHRINK 0x0002 /* prevent file from shrinking */
78 #define F_SEAL_GROW 0x0004 /* prevent file from growing */
79 #define F_SEAL_WRITE 0x0008 /* prevent writes */
83 #define F_OFD_GETLK 36
84 #define F_OFD_SETLK 37
85 #define F_OFD_SETLKW 38
88 #ifndef MFD_ALLOW_SEALING
89 #define MFD_ALLOW_SEALING 0x0002U
93 #define MFD_CLOEXEC 0x0001U
97 #define IP_FREEBIND 15
100 #ifndef OOM_SCORE_ADJ_MIN
101 #define OOM_SCORE_ADJ_MIN (-1000)
104 #ifndef OOM_SCORE_ADJ_MAX
105 #define OOM_SCORE_ADJ_MAX 1000
108 #ifndef AUDIT_SERVICE_START
109 #define AUDIT_SERVICE_START 1130 /* Service (daemon) start */
112 #ifndef AUDIT_SERVICE_STOP
113 #define AUDIT_SERVICE_STOP 1131 /* Service (daemon) stop */
117 #define TIOCVHANGUP 0x5437
120 #ifndef IP_TRANSPARENT
121 #define IP_TRANSPARENT 19
125 #define SOL_NETLINK 270
128 #if !HAVE_DECL_PIVOT_ROOT
129 static inline int pivot_root(const char *new_root, const char *put_old) {
130 return syscall(SYS_pivot_root, new_root, put_old);
134 #ifndef __NR_memfd_create
135 # if defined __x86_64__
136 # define __NR_memfd_create 319
137 # elif defined __arm__
138 # define __NR_memfd_create 385
139 # elif defined _MIPS_SIM
140 # if _MIPS_SIM == _MIPS_SIM_ABI32
141 # define __NR_memfd_create 4354
143 # if _MIPS_SIM == _MIPS_SIM_NABI32
144 # define __NR_memfd_create 6318
146 # if _MIPS_SIM == _MIPS_SIM_ABI64
147 # define __NR_memfd_create 5314
149 # elif defined __i386__
150 # define __NR_memfd_create 356
152 # warning "__NR_memfd_create unknown for your architecture"
153 # define __NR_memfd_create 0xffffffff
157 #ifndef HAVE_MEMFD_CREATE
158 static inline int memfd_create(const char *name, unsigned int flags) {
159 return syscall(__NR_memfd_create, name, flags);
163 #ifndef __NR_getrandom
164 # if defined __x86_64__
165 # define __NR_getrandom 318
166 # elif defined(__i386__)
167 # define __NR_getrandom 355
168 # elif defined(__arm__) || defined(__aarch64__)
169 # define __NR_getrandom 384
170 # elif defined(__ia64__)
171 # define __NR_getrandom 1339
172 # elif defined(__m68k__)
173 # define __NR_getrandom 352
174 # elif defined(__s390x__)
175 # define __NR_getrandom 349
177 # warning "__NR_getrandom unknown for your architecture"
178 # define __NR_getrandom 0xffffffff
182 #if !HAVE_DECL_GETRANDOM
183 static inline int getrandom(void *buffer, size_t count, unsigned flags) {
184 return syscall(__NR_getrandom, buffer, count, flags);
188 #ifndef GRND_NONBLOCK
189 #define GRND_NONBLOCK 0x0001
193 #define GRND_RANDOM 0x0002
196 #ifndef BTRFS_IOCTL_MAGIC
197 #define BTRFS_IOCTL_MAGIC 0x94
200 #ifndef BTRFS_PATH_NAME_MAX
201 #define BTRFS_PATH_NAME_MAX 4087
204 #ifndef BTRFS_DEVICE_PATH_NAME_MAX
205 #define BTRFS_DEVICE_PATH_NAME_MAX 1024
208 #ifndef BTRFS_FSID_SIZE
209 #define BTRFS_FSID_SIZE 16
212 #ifndef BTRFS_UUID_SIZE
213 #define BTRFS_UUID_SIZE 16
216 #ifndef HAVE_LINUX_BTRFS_H
217 struct btrfs_ioctl_vol_args {
219 char name[BTRFS_PATH_NAME_MAX + 1];
222 struct btrfs_ioctl_dev_info_args {
223 uint64_t devid; /* in/out */
224 uint8_t uuid[BTRFS_UUID_SIZE]; /* in/out */
225 uint64_t bytes_used; /* out */
226 uint64_t total_bytes; /* out */
227 uint64_t unused[379]; /* pad to 4k */
228 char path[BTRFS_DEVICE_PATH_NAME_MAX]; /* out */
231 struct btrfs_ioctl_fs_info_args {
232 uint64_t max_id; /* out */
233 uint64_t num_devices; /* out */
234 uint8_t fsid[BTRFS_FSID_SIZE]; /* out */
235 uint64_t reserved[124]; /* pad to 1k */
239 #ifndef BTRFS_IOC_DEFRAG
240 #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
241 struct btrfs_ioctl_vol_args)
244 #ifndef BTRFS_IOC_DEV_INFO
245 #define BTRFS_IOC_DEV_INFO _IOWR(BTRFS_IOCTL_MAGIC, 30, \
246 struct btrfs_ioctl_dev_info_args)
249 #ifndef BTRFS_IOC_FS_INFO
250 #define BTRFS_IOC_FS_INFO _IOR(BTRFS_IOCTL_MAGIC, 31, \
251 struct btrfs_ioctl_fs_info_args)
254 #ifndef BTRFS_IOC_DEVICES_READY
255 #define BTRFS_IOC_DEVICES_READY _IOR(BTRFS_IOCTL_MAGIC, 39, \
256 struct btrfs_ioctl_vol_args)
259 #ifndef BTRFS_FIRST_FREE_OBJECTID
260 #define BTRFS_FIRST_FREE_OBJECTID 256
263 #ifndef BTRFS_ROOT_TREE_OBJECTID
264 #define BTRFS_ROOT_TREE_OBJECTID 1
267 #ifndef BTRFS_QUOTA_TREE_OBJECTID
268 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
271 #ifndef BTRFS_ROOT_ITEM_KEY
272 #define BTRFS_ROOT_ITEM_KEY 132
275 #ifndef BTRFS_QGROUP_STATUS_KEY
276 #define BTRFS_QGROUP_STATUS_KEY 240
279 #ifndef BTRFS_QGROUP_INFO_KEY
280 #define BTRFS_QGROUP_INFO_KEY 242
283 #ifndef BTRFS_QGROUP_LIMIT_KEY
284 #define BTRFS_QGROUP_LIMIT_KEY 244
287 #ifndef BTRFS_SUPER_MAGIC
288 #define BTRFS_SUPER_MAGIC 0x9123683E
296 #define MS_PRIVATE (1 << 18)
299 #if !HAVE_DECL_GETTID
300 static inline pid_t gettid(void) {
301 return (pid_t) syscall(SYS_gettid);
306 #define SCM_SECURITY 0x03
309 #ifndef MS_STRICTATIME
310 #define MS_STRICTATIME (1<<24)
318 #define MS_SHARED (1<<20)
321 #ifndef PR_SET_NO_NEW_PRIVS
322 #define PR_SET_NO_NEW_PRIVS 38
325 #ifndef PR_SET_CHILD_SUBREAPER
326 #define PR_SET_CHILD_SUBREAPER 36
329 #ifndef MAX_HANDLE_SZ
330 #define MAX_HANDLE_SZ 128
333 #ifndef __NR_name_to_handle_at
334 # if defined(__x86_64__)
335 # define __NR_name_to_handle_at 303
336 # elif defined(__i386__)
337 # define __NR_name_to_handle_at 341
338 # elif defined(__arm__)
339 # define __NR_name_to_handle_at 370
340 # elif defined(__powerpc__)
341 # define __NR_name_to_handle_at 345
343 # error "__NR_name_to_handle_at is not defined"
347 #if !HAVE_DECL_NAME_TO_HANDLE_AT
349 unsigned int handle_bytes;
351 unsigned char f_handle[0];
354 static inline int name_to_handle_at(int fd, const char *name, struct file_handle *handle, int *mnt_id, int flags) {
355 return syscall(__NR_name_to_handle_at, fd, name, handle, mnt_id, flags);
359 #ifndef HAVE_SECURE_GETENV
360 # ifdef HAVE___SECURE_GETENV
361 # define secure_getenv __secure_getenv
363 # error "neither secure_getenv nor __secure_getenv are available"
367 #ifndef CIFS_MAGIC_NUMBER
368 # define CIFS_MAGIC_NUMBER 0xFF534D42
371 #ifndef TFD_TIMER_CANCEL_ON_SET
372 # define TFD_TIMER_CANCEL_ON_SET (1 << 1)
376 # define SO_REUSEPORT 15
380 # define EVIOCREVOKE _IOW('E', 0x91, int)
383 #ifndef DRM_IOCTL_SET_MASTER
384 # define DRM_IOCTL_SET_MASTER _IO('d', 0x1e)
387 #ifndef DRM_IOCTL_DROP_MASTER
388 # define DRM_IOCTL_DROP_MASTER _IO('d', 0x1f)
391 #if defined(__i386__) || defined(__x86_64__)
393 /* The precise definition of __O_TMPFILE is arch specific, so let's
394 * just define this on x86 where we know the value. */
397 #define __O_TMPFILE 020000000
400 /* a horrid kludge trying to make sure that this will fail on old kernels */
402 #define O_TMPFILE (__O_TMPFILE | O_DIRECTORY)
408 # if defined(__x86_64__)
409 # define __NR_setns 308
410 # elif defined(__i386__)
411 # define __NR_setns 346
413 # error "__NR_setns is not defined"
418 static inline int setns(int fd, int nstype) {
419 return syscall(__NR_setns, fd, nstype);
423 #if !HAVE_DECL_LO_FLAGS_PARTSCAN
424 #define LO_FLAGS_PARTSCAN 8
427 #ifndef LOOP_CTL_REMOVE
428 #define LOOP_CTL_REMOVE 0x4C81
431 #ifndef LOOP_CTL_GET_FREE
432 #define LOOP_CTL_GET_FREE 0x4C82
435 #if !HAVE_DECL_IFLA_MACVLAN_FLAGS
436 #define IFLA_MACVLAN_UNSPEC 0
437 #define IFLA_MACVLAN_MODE 1
438 #define IFLA_MACVLAN_FLAGS 2
439 #define __IFLA_MACVLAN_MAX 3
441 #define IFLA_MACVLAN_MAX (__IFLA_MACVLAN_MAX - 1)
444 #if !HAVE_DECL_IFLA_VTI_REMOTE
445 #define IFLA_VTI_UNSPEC 0
446 #define IFLA_VTI_LINK 1
447 #define IFLA_VTI_IKEY 2
448 #define IFLA_VTI_OKEY 3
449 #define IFLA_VTI_LOCAL 4
450 #define IFLA_VTI_REMOTE 5
451 #define __IFLA_VTI_MAX 6
453 #define IFLA_VTI_MAX (__IFLA_VTI_MAX - 1)
456 #if !HAVE_DECL_IFLA_PHYS_PORT_ID
457 #undef IFLA_PROMISCUITY
458 #define IFLA_PROMISCUITY 30
459 #define IFLA_NUM_TX_QUEUES 31
460 #define IFLA_NUM_RX_QUEUES 32
461 #define IFLA_CARRIER 33
462 #define IFLA_PHYS_PORT_ID 34
463 #define __IFLA_MAX 35
465 #define IFLA_MAX (__IFLA_MAX - 1)
468 #if !HAVE_DECL_IFLA_BOND_AD_INFO
469 #define IFLA_BOND_UNSPEC 0
470 #define IFLA_BOND_MODE 1
471 #define IFLA_BOND_ACTIVE_SLAVE 2
472 #define IFLA_BOND_MIIMON 3
473 #define IFLA_BOND_UPDELAY 4
474 #define IFLA_BOND_DOWNDELAY 5
475 #define IFLA_BOND_USE_CARRIER 6
476 #define IFLA_BOND_ARP_INTERVAL 7
477 #define IFLA_BOND_ARP_IP_TARGET 8
478 #define IFLA_BOND_ARP_VALIDATE 9
479 #define IFLA_BOND_ARP_ALL_TARGETS 10
480 #define IFLA_BOND_PRIMARY 11
481 #define IFLA_BOND_PRIMARY_RESELECT 12
482 #define IFLA_BOND_FAIL_OVER_MAC 13
483 #define IFLA_BOND_XMIT_HASH_POLICY 14
484 #define IFLA_BOND_RESEND_IGMP 15
485 #define IFLA_BOND_NUM_PEER_NOTIF 16
486 #define IFLA_BOND_ALL_SLAVES_ACTIVE 17
487 #define IFLA_BOND_MIN_LINKS 18
488 #define IFLA_BOND_LP_INTERVAL 19
489 #define IFLA_BOND_PACKETS_PER_SLAVE 20
490 #define IFLA_BOND_AD_LACP_RATE 21
491 #define IFLA_BOND_AD_SELECT 22
492 #define IFLA_BOND_AD_INFO 23
493 #define __IFLA_BOND_MAX 24
495 #define IFLA_BOND_MAX (__IFLA_BOND_MAX - 1)
498 #if !HAVE_DECL_IFLA_VLAN_PROTOCOL
499 #define IFLA_VLAN_UNSPEC 0
500 #define IFLA_VLAN_ID 1
501 #define IFLA_VLAN_FLAGS 2
502 #define IFLA_VLAN_EGRESS_QOS 3
503 #define IFLA_VLAN_INGRESS_QOS 4
504 #define IFLA_VLAN_PROTOCOL 5
505 #define __IFLA_VLAN_MAX 6
507 #define IFLA_VLAN_MAX (__IFLA_VLAN_MAX - 1)
510 #if !HAVE_DECL_IFLA_VXLAN_LOCAL6
511 #define IFLA_VXLAN_UNSPEC 0
512 #define IFLA_VXLAN_ID 1
513 #define IFLA_VXLAN_GROUP 2
514 #define IFLA_VXLAN_LINK 3
515 #define IFLA_VXLAN_LOCAL 4
516 #define IFLA_VXLAN_TTL 5
517 #define IFLA_VXLAN_TOS 6
518 #define IFLA_VXLAN_LEARNING 7
519 #define IFLA_VXLAN_AGEING 8
520 #define IFLA_VXLAN_LIMIT 9
521 #define IFLA_VXLAN_PORT_RANGE 10
522 #define IFLA_VXLAN_PROXY 11
523 #define IFLA_VXLAN_RSC 12
524 #define IFLA_VXLAN_L2MISS 13
525 #define IFLA_VXLAN_L3MISS 14
526 #define IFLA_VXLAN_PORT 15
527 #define IFLA_VXLAN_GROUP6 16
528 #define IFLA_VXLAN_LOCAL6 17
529 #define __IFLA_VXLAN_MAX 18
531 #define IFLA_VXLAN_MAX (__IFLA_VXLAN_MAX - 1)
534 #if !HAVE_DECL_IFLA_IPTUN_6RD_RELAY_PREFIXLEN
535 #define IFLA_IPTUN_UNSPEC 0
536 #define IFLA_IPTUN_LINK 1
537 #define IFLA_IPTUN_LOCAL 2
538 #define IFLA_IPTUN_REMOTE 3
539 #define IFLA_IPTUN_TTL 4
540 #define IFLA_IPTUN_TOS 5
541 #define IFLA_IPTUN_ENCAP_LIMIT 6
542 #define IFLA_IPTUN_FLOWINFO 7
543 #define IFLA_IPTUN_FLAGS 8
544 #define IFLA_IPTUN_PROTO 9
545 #define IFLA_IPTUN_PMTUDISC 10
546 #define IFLA_IPTUN_6RD_PREFIX 11
547 #define IFLA_IPTUN_6RD_RELAY_PREFIX 12
548 #define IFLA_IPTUN_6RD_PREFIXLEN 13
549 #define IFLA_IPTUN_6RD_RELAY_PREFIXLEN 14
550 #define __IFLA_IPTUN_MAX 15
552 #define IFLA_IPTUN_MAX (__IFLA_IPTUN_MAX - 1)
555 #if !HAVE_DECL_IFLA_BRIDGE_VLAN_INFO
556 #define IFLA_BRIDGE_FLAGS 0
557 #define IFLA_BRIDGE_MODE 1
558 #define IFLA_BRIDGE_VLAN_INFO 2
559 #define __IFLA_BRIDGE_MAX 3
561 #define IFLA_BRIDGE_MAX (__IFLA_BRIDGE_MAX - 1)
564 #if !HAVE_DECL_IFLA_BRPORT_UNICAST_FLOOD
565 #define IFLA_BRPORT_UNSPEC 0
566 #define IFLA_BRPORT_STATE 1
567 #define IFLA_BRPORT_PRIORITY 2
568 #define IFLA_BRPORT_COST 3
569 #define IFLA_BRPORT_MODE 4
570 #define IFLA_BRPORT_GUARD 5
571 #define IFLA_BRPORT_PROTECT 6
572 #define IFLA_BRPORT_FAST_LEAVE 7
573 #define IFLA_BRPORT_LEARNING 8
574 #define IFLA_BRPORT_UNICAST_FLOOD 9
575 #define __IFLA_BRPORT_MAX 10
577 #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
580 #ifndef IPV6_UNICAST_IF
581 #define IPV6_UNICAST_IF 76
584 #ifndef IFF_MULTI_QUEUE
585 #define IFF_MULTI_QUEUE 0x100
589 #define IFF_LOWER_UP 0x10000
593 #define IFF_DORMANT 0x20000
596 #ifndef BOND_XMIT_POLICY_ENCAP23
597 #define BOND_XMIT_POLICY_ENCAP23 3
600 #ifndef BOND_XMIT_POLICY_ENCAP34
601 #define BOND_XMIT_POLICY_ENCAP34 4
604 #ifndef NET_ADDR_RANDOM
605 # define NET_ADDR_RANDOM 1
608 #ifndef NET_NAME_UNKNOWN
609 # define NET_NAME_UNKNOWN 0
612 #ifndef NET_NAME_ENUM
613 # define NET_NAME_ENUM 1
616 #ifndef NET_NAME_PREDICTABLE
617 # define NET_NAME_PREDICTABLE 2
620 #ifndef NET_NAME_USER
621 # define NET_NAME_USER 3
624 #ifndef NET_NAME_RENAMED
625 # define NET_NAME_RENAMED 4
629 # define BPF_XOR 0xa0
632 /* Note that LOOPBACK_IFINDEX is currently not exported by the
633 * kernel/glibc, but hardcoded internally by the kernel. However, as
634 * it is exported to userspace indirectly via rtnetlink and the
635 * ioctls, and made use of widely we define it here too, in a way that
636 * is compatible with the kernel's internal definition. */
637 #ifndef LOOPBACK_IFINDEX
638 #define LOOPBACK_IFINDEX 1
641 #ifndef MAX_AUDIT_MESSAGE_LENGTH
642 #define MAX_AUDIT_MESSAGE_LENGTH 8970
645 #ifndef AUDIT_NLGRP_MAX
646 #define AUDIT_NLGRP_READLOG 1
649 #ifndef CAP_MAC_OVERRIDE
650 #define CAP_MAC_OVERRIDE 32
653 #ifndef CAP_MAC_ADMIN
654 #define CAP_MAC_ADMIN 33
658 #define CAP_SYSLOG 34
661 #ifndef CAP_WAKE_ALARM
662 #define CAP_WAKE_ALARM 35
665 #ifndef CAP_BLOCK_SUSPEND
666 #define CAP_BLOCK_SUSPEND 36
669 #ifndef CAP_AUDIT_READ
670 #define CAP_AUDIT_READ 37
673 static inline int raw_clone(unsigned long flags, void *child_stack) {
674 #if defined(__s390__) || defined(__CRIS__)
675 /* On s390 and cris the order of the first and second arguments
676 * of the raw clone() system call is reversed. */
677 return (int) syscall(__NR_clone, child_stack, flags);
679 return (int) syscall(__NR_clone, flags, child_stack);
683 static inline pid_t raw_getpid(void) {
684 return (pid_t) syscall(__NR_getpid);
687 #if !HAVE_DECL_RENAMEAT2
689 #ifndef __NR_renameat2
690 # if defined __x86_64__
691 # define __NR_renameat2 316
692 # elif defined __arm__
693 # define __NR_renameat2 382
694 # elif defined _MIPS_SIM
695 # if _MIPS_SIM == _MIPS_SIM_ABI32
696 # define __NR_renameat2 4351
698 # if _MIPS_SIM == _MIPS_SIM_NABI32
699 # define __NR_renameat2 6315
701 # if _MIPS_SIM == _MIPS_SIM_ABI64
702 # define __NR_renameat2 5311
704 # elif defined __i386__
705 # define __NR_renameat2 353
707 # warning "__NR_renameat2 unknown for your architecture"
708 # define __NR_renameat2 0xffffffff
712 static inline int renameat2(int oldfd, const char *oldname, int newfd, const char *newname, unsigned flags) {
713 return syscall(__NR_renameat2, oldfd, oldname, newfd, newname, flags);
717 #ifndef RENAME_NOREPLACE
718 #define RENAME_NOREPLACE (1 << 0)
722 static inline int kcmp(pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned long idx2) {
723 return syscall(__NR_kcmp, pid1, pid2, type, idx1, idx2);