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 */
82 #ifndef MFD_ALLOW_SEALING
83 #define MFD_ALLOW_SEALING 0x0002U
87 #define MFD_CLOEXEC 0x0001U
91 #define IP_FREEBIND 15
94 #ifndef OOM_SCORE_ADJ_MIN
95 #define OOM_SCORE_ADJ_MIN (-1000)
98 #ifndef OOM_SCORE_ADJ_MAX
99 #define OOM_SCORE_ADJ_MAX 1000
102 #ifndef AUDIT_SERVICE_START
103 #define AUDIT_SERVICE_START 1130 /* Service (daemon) start */
106 #ifndef AUDIT_SERVICE_STOP
107 #define AUDIT_SERVICE_STOP 1131 /* Service (daemon) stop */
111 #define TIOCVHANGUP 0x5437
114 #ifndef IP_TRANSPARENT
115 #define IP_TRANSPARENT 19
119 #define SOL_NETLINK 270
122 #if !HAVE_DECL_PIVOT_ROOT
123 static inline int pivot_root(const char *new_root, const char *put_old) {
124 return syscall(SYS_pivot_root, new_root, put_old);
128 #ifndef __NR_memfd_create
129 # if defined __x86_64__
130 # define __NR_memfd_create 319
131 # elif defined __arm__
132 # define __NR_memfd_create 385
133 # elif defined _MIPS_SIM
134 # if _MIPS_SIM == _MIPS_SIM_ABI32
135 # define __NR_memfd_create 4354
137 # if _MIPS_SIM == _MIPS_SIM_NABI32
138 # define __NR_memfd_create 6318
140 # if _MIPS_SIM == _MIPS_SIM_ABI64
141 # define __NR_memfd_create 5314
143 # elif defined __i386__
144 # define __NR_memfd_create 356
146 # warning "__NR_memfd_create unknown for your architecture"
147 # define __NR_memfd_create 0xffffffff
151 #ifndef HAVE_MEMFD_CREATE
152 static inline int memfd_create(const char *name, unsigned int flags) {
153 return syscall(__NR_memfd_create, name, flags);
157 #ifndef __NR_getrandom
158 # if defined __x86_64__
159 # define __NR_getrandom 318
160 # elif defined(__i386__)
161 # define __NR_getrandom 355
162 # elif defined(__arm__) || defined(__aarch64__)
163 # define __NR_getrandom 384
164 # elif defined(__ia64__)
165 # define __NR_getrandom 1339
166 # elif defined(__m68k__)
167 # define __NR_getrandom 352
168 # elif defined(__s390x__)
169 # define __NR_getrandom 349
171 # warning "__NR_getrandom unknown for your architecture"
172 # define __NR_getrandom 0xffffffff
176 #if !HAVE_DECL_GETRANDOM
177 static inline int getrandom(void *buffer, size_t count, unsigned flags) {
178 return syscall(__NR_getrandom, buffer, count, flags);
182 #ifndef GRND_NONBLOCK
183 #define GRND_NONBLOCK 0x0001
187 #define GRND_RANDOM 0x0002
190 #ifndef BTRFS_IOCTL_MAGIC
191 #define BTRFS_IOCTL_MAGIC 0x94
194 #ifndef BTRFS_PATH_NAME_MAX
195 #define BTRFS_PATH_NAME_MAX 4087
198 #ifndef BTRFS_DEVICE_PATH_NAME_MAX
199 #define BTRFS_DEVICE_PATH_NAME_MAX 1024
202 #ifndef BTRFS_FSID_SIZE
203 #define BTRFS_FSID_SIZE 16
206 #ifndef BTRFS_UUID_SIZE
207 #define BTRFS_UUID_SIZE 16
210 #ifndef HAVE_LINUX_BTRFS_H
211 struct btrfs_ioctl_vol_args {
213 char name[BTRFS_PATH_NAME_MAX + 1];
216 struct btrfs_ioctl_dev_info_args {
217 uint64_t devid; /* in/out */
218 uint8_t uuid[BTRFS_UUID_SIZE]; /* in/out */
219 uint64_t bytes_used; /* out */
220 uint64_t total_bytes; /* out */
221 uint64_t unused[379]; /* pad to 4k */
222 char path[BTRFS_DEVICE_PATH_NAME_MAX]; /* out */
225 struct btrfs_ioctl_fs_info_args {
226 uint64_t max_id; /* out */
227 uint64_t num_devices; /* out */
228 uint8_t fsid[BTRFS_FSID_SIZE]; /* out */
229 uint64_t reserved[124]; /* pad to 1k */
233 #ifndef BTRFS_IOC_DEFRAG
234 #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
235 struct btrfs_ioctl_vol_args)
238 #ifndef BTRFS_IOC_DEV_INFO
239 #define BTRFS_IOC_DEV_INFO _IOWR(BTRFS_IOCTL_MAGIC, 30, \
240 struct btrfs_ioctl_dev_info_args)
243 #ifndef BTRFS_IOC_FS_INFO
244 #define BTRFS_IOC_FS_INFO _IOR(BTRFS_IOCTL_MAGIC, 31, \
245 struct btrfs_ioctl_fs_info_args)
248 #ifndef BTRFS_IOC_DEVICES_READY
249 #define BTRFS_IOC_DEVICES_READY _IOR(BTRFS_IOCTL_MAGIC, 39, \
250 struct btrfs_ioctl_vol_args)
253 #ifndef BTRFS_FIRST_FREE_OBJECTID
254 #define BTRFS_FIRST_FREE_OBJECTID 256
257 #ifndef BTRFS_ROOT_TREE_OBJECTID
258 #define BTRFS_ROOT_TREE_OBJECTID 1
261 #ifndef BTRFS_QUOTA_TREE_OBJECTID
262 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
265 #ifndef BTRFS_ROOT_ITEM_KEY
266 #define BTRFS_ROOT_ITEM_KEY 132
269 #ifndef BTRFS_QGROUP_STATUS_KEY
270 #define BTRFS_QGROUP_STATUS_KEY 240
273 #ifndef BTRFS_QGROUP_INFO_KEY
274 #define BTRFS_QGROUP_INFO_KEY 242
277 #ifndef BTRFS_QGROUP_LIMIT_KEY
278 #define BTRFS_QGROUP_LIMIT_KEY 244
281 #ifndef BTRFS_SUPER_MAGIC
282 #define BTRFS_SUPER_MAGIC 0x9123683E
290 #define MS_PRIVATE (1 << 18)
293 #if !HAVE_DECL_GETTID
294 static inline pid_t gettid(void) {
295 return (pid_t) syscall(SYS_gettid);
300 #define SCM_SECURITY 0x03
303 #ifndef MS_STRICTATIME
304 #define MS_STRICTATIME (1<<24)
312 #define MS_SHARED (1<<20)
315 #ifndef PR_SET_NO_NEW_PRIVS
316 #define PR_SET_NO_NEW_PRIVS 38
319 #ifndef PR_SET_CHILD_SUBREAPER
320 #define PR_SET_CHILD_SUBREAPER 36
323 #ifndef MAX_HANDLE_SZ
324 #define MAX_HANDLE_SZ 128
327 #ifndef __NR_name_to_handle_at
328 # if defined(__x86_64__)
329 # define __NR_name_to_handle_at 303
330 # elif defined(__i386__)
331 # define __NR_name_to_handle_at 341
332 # elif defined(__arm__)
333 # define __NR_name_to_handle_at 370
334 # elif defined(__powerpc__)
335 # define __NR_name_to_handle_at 345
337 # error "__NR_name_to_handle_at is not defined"
341 #if !HAVE_DECL_NAME_TO_HANDLE_AT
343 unsigned int handle_bytes;
345 unsigned char f_handle[0];
348 static inline int name_to_handle_at(int fd, const char *name, struct file_handle *handle, int *mnt_id, int flags) {
349 return syscall(__NR_name_to_handle_at, fd, name, handle, mnt_id, flags);
353 #ifndef HAVE_SECURE_GETENV
354 # ifdef HAVE___SECURE_GETENV
355 # define secure_getenv __secure_getenv
357 # error "neither secure_getenv nor __secure_getenv are available"
361 #ifndef CIFS_MAGIC_NUMBER
362 # define CIFS_MAGIC_NUMBER 0xFF534D42
365 #ifndef TFD_TIMER_CANCEL_ON_SET
366 # define TFD_TIMER_CANCEL_ON_SET (1 << 1)
370 # define SO_REUSEPORT 15
374 # define EVIOCREVOKE _IOW('E', 0x91, int)
377 #ifndef DRM_IOCTL_SET_MASTER
378 # define DRM_IOCTL_SET_MASTER _IO('d', 0x1e)
381 #ifndef DRM_IOCTL_DROP_MASTER
382 # define DRM_IOCTL_DROP_MASTER _IO('d', 0x1f)
385 #if defined(__i386__) || defined(__x86_64__)
387 /* The precise definition of __O_TMPFILE is arch specific, so let's
388 * just define this on x86 where we know the value. */
391 #define __O_TMPFILE 020000000
394 /* a horrid kludge trying to make sure that this will fail on old kernels */
396 #define O_TMPFILE (__O_TMPFILE | O_DIRECTORY)
402 # if defined(__x86_64__)
403 # define __NR_setns 308
404 # elif defined(__i386__)
405 # define __NR_setns 346
407 # error "__NR_setns is not defined"
412 static inline int setns(int fd, int nstype) {
413 return syscall(__NR_setns, fd, nstype);
417 #if !HAVE_DECL_LO_FLAGS_PARTSCAN
418 #define LO_FLAGS_PARTSCAN 8
421 #ifndef LOOP_CTL_REMOVE
422 #define LOOP_CTL_REMOVE 0x4C81
425 #ifndef LOOP_CTL_GET_FREE
426 #define LOOP_CTL_GET_FREE 0x4C82
429 #if !HAVE_DECL_IFLA_MACVLAN_FLAGS
430 #define IFLA_MACVLAN_UNSPEC 0
431 #define IFLA_MACVLAN_MODE 1
432 #define IFLA_MACVLAN_FLAGS 2
433 #define __IFLA_MACVLAN_MAX 3
435 #define IFLA_MACVLAN_MAX (__IFLA_MACVLAN_MAX - 1)
438 #if !HAVE_DECL_IFLA_VTI_REMOTE
439 #define IFLA_VTI_UNSPEC 0
440 #define IFLA_VTI_LINK 1
441 #define IFLA_VTI_IKEY 2
442 #define IFLA_VTI_OKEY 3
443 #define IFLA_VTI_LOCAL 4
444 #define IFLA_VTI_REMOTE 5
445 #define __IFLA_VTI_MAX 6
447 #define IFLA_VTI_MAX (__IFLA_VTI_MAX - 1)
450 #if !HAVE_DECL_IFLA_PHYS_PORT_ID
451 #undef IFLA_PROMISCUITY
452 #define IFLA_PROMISCUITY 30
453 #define IFLA_NUM_TX_QUEUES 31
454 #define IFLA_NUM_RX_QUEUES 32
455 #define IFLA_CARRIER 33
456 #define IFLA_PHYS_PORT_ID 34
457 #define __IFLA_MAX 35
459 #define IFLA_MAX (__IFLA_MAX - 1)
462 #if !HAVE_DECL_IFLA_BOND_AD_INFO
463 #define IFLA_BOND_UNSPEC 0
464 #define IFLA_BOND_MODE 1
465 #define IFLA_BOND_ACTIVE_SLAVE 2
466 #define IFLA_BOND_MIIMON 3
467 #define IFLA_BOND_UPDELAY 4
468 #define IFLA_BOND_DOWNDELAY 5
469 #define IFLA_BOND_USE_CARRIER 6
470 #define IFLA_BOND_ARP_INTERVAL 7
471 #define IFLA_BOND_ARP_IP_TARGET 8
472 #define IFLA_BOND_ARP_VALIDATE 9
473 #define IFLA_BOND_ARP_ALL_TARGETS 10
474 #define IFLA_BOND_PRIMARY 11
475 #define IFLA_BOND_PRIMARY_RESELECT 12
476 #define IFLA_BOND_FAIL_OVER_MAC 13
477 #define IFLA_BOND_XMIT_HASH_POLICY 14
478 #define IFLA_BOND_RESEND_IGMP 15
479 #define IFLA_BOND_NUM_PEER_NOTIF 16
480 #define IFLA_BOND_ALL_SLAVES_ACTIVE 17
481 #define IFLA_BOND_MIN_LINKS 18
482 #define IFLA_BOND_LP_INTERVAL 19
483 #define IFLA_BOND_PACKETS_PER_SLAVE 20
484 #define IFLA_BOND_AD_LACP_RATE 21
485 #define IFLA_BOND_AD_SELECT 22
486 #define IFLA_BOND_AD_INFO 23
487 #define __IFLA_BOND_MAX 24
489 #define IFLA_BOND_MAX (__IFLA_BOND_MAX - 1)
492 #if !HAVE_DECL_IFLA_VLAN_PROTOCOL
493 #define IFLA_VLAN_UNSPEC 0
494 #define IFLA_VLAN_ID 1
495 #define IFLA_VLAN_FLAGS 2
496 #define IFLA_VLAN_EGRESS_QOS 3
497 #define IFLA_VLAN_INGRESS_QOS 4
498 #define IFLA_VLAN_PROTOCOL 5
499 #define __IFLA_VLAN_MAX 6
501 #define IFLA_VLAN_MAX (__IFLA_VLAN_MAX - 1)
504 #if !HAVE_DECL_IFLA_VXLAN_LOCAL6
505 #define IFLA_VXLAN_UNSPEC 0
506 #define IFLA_VXLAN_ID 1
507 #define IFLA_VXLAN_GROUP 2
508 #define IFLA_VXLAN_LINK 3
509 #define IFLA_VXLAN_LOCAL 4
510 #define IFLA_VXLAN_TTL 5
511 #define IFLA_VXLAN_TOS 6
512 #define IFLA_VXLAN_LEARNING 7
513 #define IFLA_VXLAN_AGEING 8
514 #define IFLA_VXLAN_LIMIT 9
515 #define IFLA_VXLAN_PORT_RANGE 10
516 #define IFLA_VXLAN_PROXY 11
517 #define IFLA_VXLAN_RSC 12
518 #define IFLA_VXLAN_L2MISS 13
519 #define IFLA_VXLAN_L3MISS 14
520 #define IFLA_VXLAN_PORT 15
521 #define IFLA_VXLAN_GROUP6 16
522 #define IFLA_VXLAN_LOCAL6 17
523 #define __IFLA_VXLAN_MAX 18
525 #define IFLA_VXLAN_MAX (__IFLA_VXLAN_MAX - 1)
528 #if !HAVE_DECL_IFLA_IPTUN_6RD_RELAY_PREFIXLEN
529 #define IFLA_IPTUN_UNSPEC 0
530 #define IFLA_IPTUN_LINK 1
531 #define IFLA_IPTUN_LOCAL 2
532 #define IFLA_IPTUN_REMOTE 3
533 #define IFLA_IPTUN_TTL 4
534 #define IFLA_IPTUN_TOS 5
535 #define IFLA_IPTUN_ENCAP_LIMIT 6
536 #define IFLA_IPTUN_FLOWINFO 7
537 #define IFLA_IPTUN_FLAGS 8
538 #define IFLA_IPTUN_PROTO 9
539 #define IFLA_IPTUN_PMTUDISC 10
540 #define IFLA_IPTUN_6RD_PREFIX 11
541 #define IFLA_IPTUN_6RD_RELAY_PREFIX 12
542 #define IFLA_IPTUN_6RD_PREFIXLEN 13
543 #define IFLA_IPTUN_6RD_RELAY_PREFIXLEN 14
544 #define __IFLA_IPTUN_MAX 15
546 #define IFLA_IPTUN_MAX (__IFLA_IPTUN_MAX - 1)
549 #if !HAVE_DECL_IFLA_BRIDGE_VLAN_INFO
550 #define IFLA_BRIDGE_FLAGS 0
551 #define IFLA_BRIDGE_MODE 1
552 #define IFLA_BRIDGE_VLAN_INFO 2
553 #define __IFLA_BRIDGE_MAX 3
555 #define IFLA_BRIDGE_MAX (__IFLA_BRIDGE_MAX - 1)
558 #if !HAVE_DECL_IFLA_BRPORT_UNICAST_FLOOD
559 #define IFLA_BRPORT_UNSPEC 0
560 #define IFLA_BRPORT_STATE 1
561 #define IFLA_BRPORT_PRIORITY 2
562 #define IFLA_BRPORT_COST 3
563 #define IFLA_BRPORT_MODE 4
564 #define IFLA_BRPORT_GUARD 5
565 #define IFLA_BRPORT_PROTECT 6
566 #define IFLA_BRPORT_FAST_LEAVE 7
567 #define IFLA_BRPORT_LEARNING 8
568 #define IFLA_BRPORT_UNICAST_FLOOD 9
569 #define __IFLA_BRPORT_MAX 10
571 #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
574 #ifndef IPV6_UNICAST_IF
575 #define IPV6_UNICAST_IF 76
578 #ifndef IFF_MULTI_QUEUE
579 #define IFF_MULTI_QUEUE 0x100
583 #define IFF_LOWER_UP 0x10000
587 #define IFF_DORMANT 0x20000
590 #ifndef BOND_XMIT_POLICY_ENCAP23
591 #define BOND_XMIT_POLICY_ENCAP23 3
594 #ifndef BOND_XMIT_POLICY_ENCAP34
595 #define BOND_XMIT_POLICY_ENCAP34 4
598 #ifndef NET_ADDR_RANDOM
599 # define NET_ADDR_RANDOM 1
602 #ifndef NET_NAME_UNKNOWN
603 # define NET_NAME_UNKNOWN 0
606 #ifndef NET_NAME_ENUM
607 # define NET_NAME_ENUM 1
610 #ifndef NET_NAME_PREDICTABLE
611 # define NET_NAME_PREDICTABLE 2
614 #ifndef NET_NAME_USER
615 # define NET_NAME_USER 3
618 #ifndef NET_NAME_RENAMED
619 # define NET_NAME_RENAMED 4
623 # define BPF_XOR 0xa0
626 /* Note that LOOPBACK_IFINDEX is currently not exported by the
627 * kernel/glibc, but hardcoded internally by the kernel. However, as
628 * it is exported to userspace indirectly via rtnetlink and the
629 * ioctls, and made use of widely we define it here too, in a way that
630 * is compatible with the kernel's internal definition. */
631 #ifndef LOOPBACK_IFINDEX
632 #define LOOPBACK_IFINDEX 1
635 #ifndef MAX_AUDIT_MESSAGE_LENGTH
636 #define MAX_AUDIT_MESSAGE_LENGTH 8970
639 #ifndef AUDIT_NLGRP_MAX
640 #define AUDIT_NLGRP_READLOG 1
643 #ifndef CAP_MAC_OVERRIDE
644 #define CAP_MAC_OVERRIDE 32
647 #ifndef CAP_MAC_ADMIN
648 #define CAP_MAC_ADMIN 33
652 #define CAP_SYSLOG 34
655 #ifndef CAP_WAKE_ALARM
656 #define CAP_WAKE_ALARM 35
659 #ifndef CAP_BLOCK_SUSPEND
660 #define CAP_BLOCK_SUSPEND 36
663 #ifndef CAP_AUDIT_READ
664 #define CAP_AUDIT_READ 37
667 static inline int raw_clone(unsigned long flags, void *child_stack) {
668 #if defined(__s390__) || defined(__CRIS__)
669 /* On s390 and cris the order of the first and second arguments
670 * of the raw clone() system call is reversed. */
671 return (int) syscall(__NR_clone, child_stack, flags);
673 return (int) syscall(__NR_clone, flags, child_stack);
677 static inline pid_t raw_getpid(void) {
678 return (pid_t) syscall(__NR_getpid);
681 #if !HAVE_DECL_RENAMEAT2
683 #ifndef __NR_renameat2
684 # if defined __x86_64__
685 # define __NR_renameat2 316
686 # elif defined __arm__
687 # define __NR_renameat2 382
688 # elif defined _MIPS_SIM
689 # if _MIPS_SIM == _MIPS_SIM_ABI32
690 # define __NR_renameat2 4351
692 # if _MIPS_SIM == _MIPS_SIM_NABI32
693 # define __NR_renameat2 6315
695 # if _MIPS_SIM == _MIPS_SIM_ABI64
696 # define __NR_renameat2 5311
698 # elif defined __i386__
699 # define __NR_renameat2 353
701 # warning "__NR_renameat2 unknown for your architecture"
702 # define __NR_renameat2 0xffffffff
706 static inline int renameat2(int oldfd, const char *oldname, int newfd, const char *newname, unsigned flags) {
707 return syscall(__NR_renameat2, oldfd, oldname, newfd, newname, flags);
711 #ifndef RENAME_NOREPLACE
712 #define RENAME_NOREPLACE (1 << 0)