Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 356 insertions, 0 deletions

diff --git a/src/basic/cgroup-util.h b/src/basic/cgroup-util.h
new file mode 100644
index 0000000..d06eb6d
--- /dev/null
+++ b/src/basic/cgroup-util.h
@@ -0,0 +1,356 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <sys/statfs.h>
+#include <sys/types.h>
+
+#include "constants.h"
+#include "pidref.h"
+#include "set.h"
+
+#define SYSTEMD_CGROUP_CONTROLLER_LEGACY "name=systemd"
+#define SYSTEMD_CGROUP_CONTROLLER_HYBRID "name=unified"
+#define SYSTEMD_CGROUP_CONTROLLER "_systemd"
+
+/* An enum of well known cgroup controllers */
+typedef enum CGroupController {
+        /* Original cgroup controllers */
+        CGROUP_CONTROLLER_CPU,
+        CGROUP_CONTROLLER_CPUACCT,    /* v1 only */
+        CGROUP_CONTROLLER_CPUSET,     /* v2 only */
+        CGROUP_CONTROLLER_IO,         /* v2 only */
+        CGROUP_CONTROLLER_BLKIO,      /* v1 only */
+        CGROUP_CONTROLLER_MEMORY,
+        CGROUP_CONTROLLER_DEVICES,    /* v1 only */
+        CGROUP_CONTROLLER_PIDS,
+
+        /* BPF-based pseudo-controllers, v2 only */
+        CGROUP_CONTROLLER_BPF_FIREWALL,
+        CGROUP_CONTROLLER_BPF_DEVICES,
+        CGROUP_CONTROLLER_BPF_FOREIGN,
+        CGROUP_CONTROLLER_BPF_SOCKET_BIND,
+        CGROUP_CONTROLLER_BPF_RESTRICT_NETWORK_INTERFACES,
+        /* The BPF hook implementing RestrictFileSystems= is not defined here.
+         * It's applied as late as possible in exec_invoke() so we don't block
+         * our own unit setup code. */
+
+        _CGROUP_CONTROLLER_MAX,
+        _CGROUP_CONTROLLER_INVALID = -EINVAL,
+} CGroupController;
+
+#define CGROUP_CONTROLLER_TO_MASK(c) (1U << (c))
+
+/* A bit mask of well known cgroup controllers */
+typedef enum CGroupMask {
+        CGROUP_MASK_CPU = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPU),
+        CGROUP_MASK_CPUACCT = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPUACCT),
+        CGROUP_MASK_CPUSET = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPUSET),
+        CGROUP_MASK_IO = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_IO),
+        CGROUP_MASK_BLKIO = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BLKIO),
+        CGROUP_MASK_MEMORY = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_MEMORY),
+        CGROUP_MASK_DEVICES = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_DEVICES),
+        CGROUP_MASK_PIDS = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_PIDS),
+        CGROUP_MASK_BPF_FIREWALL = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_FIREWALL),
+        CGROUP_MASK_BPF_DEVICES = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_DEVICES),
+        CGROUP_MASK_BPF_FOREIGN = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_FOREIGN),
+        CGROUP_MASK_BPF_SOCKET_BIND = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_SOCKET_BIND),
+        CGROUP_MASK_BPF_RESTRICT_NETWORK_INTERFACES = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_RESTRICT_NETWORK_INTERFACES),
+
+        /* All real cgroup v1 controllers */
+        CGROUP_MASK_V1 = CGROUP_MASK_CPU|CGROUP_MASK_CPUACCT|CGROUP_MASK_BLKIO|CGROUP_MASK_MEMORY|CGROUP_MASK_DEVICES|CGROUP_MASK_PIDS,
+
+        /* All real cgroup v2 controllers */
+        CGROUP_MASK_V2 = CGROUP_MASK_CPU|CGROUP_MASK_CPUSET|CGROUP_MASK_IO|CGROUP_MASK_MEMORY|CGROUP_MASK_PIDS,
+
+        /* All controllers we want to delegate in case of Delegate=yes. Which are prety much the v2 controllers only, as delegation on v1 is not safe, and bpf stuff isn't a real controller */
+        CGROUP_MASK_DELEGATE = CGROUP_MASK_V2,
+
+        /* All cgroup v2 BPF pseudo-controllers */
+        CGROUP_MASK_BPF = CGROUP_MASK_BPF_FIREWALL|CGROUP_MASK_BPF_DEVICES|CGROUP_MASK_BPF_FOREIGN|CGROUP_MASK_BPF_SOCKET_BIND|CGROUP_MASK_BPF_RESTRICT_NETWORK_INTERFACES,
+
+        _CGROUP_MASK_ALL = CGROUP_CONTROLLER_TO_MASK(_CGROUP_CONTROLLER_MAX) - 1,
+} CGroupMask;
+
+static inline CGroupMask CGROUP_MASK_EXTEND_JOINED(CGroupMask mask) {
+        /* We always mount "cpu" and "cpuacct" in the same hierarchy. Hence, when one bit is set also set the other */
+
+        if (mask & (CGROUP_MASK_CPU|CGROUP_MASK_CPUACCT))
+                mask |= (CGROUP_MASK_CPU|CGROUP_MASK_CPUACCT);
+
+        return mask;
+}
+
+CGroupMask get_cpu_accounting_mask(void);
+bool cpu_accounting_is_cheap(void);
+
+/* Special values for all weight knobs on unified hierarchy */
+#define CGROUP_WEIGHT_INVALID UINT64_MAX
+#define CGROUP_WEIGHT_IDLE UINT64_C(0)
+#define CGROUP_WEIGHT_MIN UINT64_C(1)
+#define CGROUP_WEIGHT_MAX UINT64_C(10000)
+#define CGROUP_WEIGHT_DEFAULT UINT64_C(100)
+
+#define CGROUP_LIMIT_MIN UINT64_C(0)
+#define CGROUP_LIMIT_MAX UINT64_MAX
+
+static inline bool CGROUP_WEIGHT_IS_OK(uint64_t x) {
+        return
+            x == CGROUP_WEIGHT_INVALID ||
+            (x >= CGROUP_WEIGHT_MIN && x <= CGROUP_WEIGHT_MAX);
+}
+
+/* IO limits on unified hierarchy */
+typedef enum CGroupIOLimitType {
+        CGROUP_IO_RBPS_MAX,
+        CGROUP_IO_WBPS_MAX,
+        CGROUP_IO_RIOPS_MAX,
+        CGROUP_IO_WIOPS_MAX,
+
+        _CGROUP_IO_LIMIT_TYPE_MAX,
+        _CGROUP_IO_LIMIT_TYPE_INVALID = -EINVAL,
+} CGroupIOLimitType;
+
+extern const uint64_t cgroup_io_limit_defaults[_CGROUP_IO_LIMIT_TYPE_MAX];
+
+const char* cgroup_io_limit_type_to_string(CGroupIOLimitType t) _const_;
+CGroupIOLimitType cgroup_io_limit_type_from_string(const char *s) _pure_;
+
+/* Special values for the cpu.shares attribute */
+#define CGROUP_CPU_SHARES_INVALID UINT64_MAX
+#define CGROUP_CPU_SHARES_MIN UINT64_C(2)
+#define CGROUP_CPU_SHARES_MAX UINT64_C(262144)
+#define CGROUP_CPU_SHARES_DEFAULT UINT64_C(1024)
+
+static inline bool CGROUP_CPU_SHARES_IS_OK(uint64_t x) {
+        return
+            x == CGROUP_CPU_SHARES_INVALID ||
+            (x >= CGROUP_CPU_SHARES_MIN && x <= CGROUP_CPU_SHARES_MAX);
+}
+
+/* Special values for the special {blkio,io}.bfq.weight attribute */
+#define CGROUP_BFQ_WEIGHT_INVALID UINT64_MAX
+#define CGROUP_BFQ_WEIGHT_MIN UINT64_C(1)
+#define CGROUP_BFQ_WEIGHT_MAX UINT64_C(1000)
+#define CGROUP_BFQ_WEIGHT_DEFAULT UINT64_C(100)
+
+/* Convert the normal io.weight value to io.bfq.weight */
+static inline uint64_t BFQ_WEIGHT(uint64_t io_weight) {
+        return
+            io_weight <= CGROUP_WEIGHT_DEFAULT ?
+            CGROUP_BFQ_WEIGHT_DEFAULT - (CGROUP_WEIGHT_DEFAULT - io_weight) * (CGROUP_BFQ_WEIGHT_DEFAULT - CGROUP_BFQ_WEIGHT_MIN) / (CGROUP_WEIGHT_DEFAULT - CGROUP_WEIGHT_MIN) :
+            CGROUP_BFQ_WEIGHT_DEFAULT + (io_weight - CGROUP_WEIGHT_DEFAULT) * (CGROUP_BFQ_WEIGHT_MAX - CGROUP_BFQ_WEIGHT_DEFAULT) / (CGROUP_WEIGHT_MAX - CGROUP_WEIGHT_DEFAULT);
+}
+
+/* Special values for the blkio.weight attribute */
+#define CGROUP_BLKIO_WEIGHT_INVALID UINT64_MAX
+#define CGROUP_BLKIO_WEIGHT_MIN UINT64_C(10)
+#define CGROUP_BLKIO_WEIGHT_MAX UINT64_C(1000)
+#define CGROUP_BLKIO_WEIGHT_DEFAULT UINT64_C(500)
+
+static inline bool CGROUP_BLKIO_WEIGHT_IS_OK(uint64_t x) {
+        return
+            x == CGROUP_BLKIO_WEIGHT_INVALID ||
+            (x >= CGROUP_BLKIO_WEIGHT_MIN && x <= CGROUP_BLKIO_WEIGHT_MAX);
+}
+
+typedef enum CGroupUnified {
+        CGROUP_UNIFIED_UNKNOWN = -1,
+        CGROUP_UNIFIED_NONE = 0,        /* Both systemd and controllers on legacy */
+        CGROUP_UNIFIED_SYSTEMD = 1,     /* Only systemd on unified */
+        CGROUP_UNIFIED_ALL = 2,         /* Both systemd and controllers on unified */
+} CGroupUnified;
+
+/*
+ * General rules:
+ *
+ * We accept named hierarchies in the syntax "foo" and "name=foo".
+ *
+ * We expect that named hierarchies do not conflict in name with a
+ * kernel hierarchy, modulo the "name=" prefix.
+ *
+ * We always generate "normalized" controller names, i.e. without the
+ * "name=" prefix.
+ *
+ * We require absolute cgroup paths. When returning, we will always
+ * generate paths with multiple adjacent / removed.
+ */
+
+int cg_enumerate_processes(const char *controller, const char *path, FILE **ret);
+int cg_read_pid(FILE *f, pid_t *ret);
+int cg_read_pidref(FILE *f, PidRef *ret);
+int cg_read_event(const char *controller, const char *path, const char *event, char **ret);
+
+int cg_enumerate_subgroups(const char *controller, const char *path, DIR **ret);
+int cg_read_subgroup(DIR *d, char **ret);
+
+typedef enum CGroupFlags {
+        CGROUP_SIGCONT     = 1 << 0,
+        CGROUP_IGNORE_SELF = 1 << 1,
+        CGROUP_REMOVE      = 1 << 2,
+} CGroupFlags;
+
+typedef int (*cg_kill_log_func_t)(const PidRef *pid, int sig, void *userdata);
+
+int cg_kill(const char *path, int sig, CGroupFlags flags, Set *s, cg_kill_log_func_t kill_log, void *userdata);
+int cg_kill_kernel_sigkill(const char *path);
+int cg_kill_recursive(const char *path, int sig, CGroupFlags flags, Set *s, cg_kill_log_func_t kill_log, void *userdata);
+
+int cg_split_spec(const char *spec, char **ret_controller, char **ret_path);
+int cg_mangle_path(const char *path, char **ret);
+
+int cg_get_path(const char *controller, const char *path, const char *suffix, char **ret);
+int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **ret);
+
+int cg_pid_get_path(const char *controller, pid_t pid, char **ret);
+int cg_pidref_get_path(const char *controller, const PidRef *pidref, char **ret);
+
+int cg_rmdir(const char *controller, const char *path);
+
+int cg_is_threaded(const char *path);
+
+int cg_is_delegated(const char *path);
+int cg_is_delegated_fd(int fd);
+
+int cg_has_coredump_receive(const char *path);
+
+typedef enum  {
+        CG_KEY_MODE_GRACEFUL = 1 << 0,
+} CGroupKeyMode;
+
+int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value);
+int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret);
+int cg_get_keyed_attribute_full(const char *controller, const char *path, const char *attribute, char **keys, char **values, CGroupKeyMode mode);
+
+static inline int cg_get_keyed_attribute(
+                const char *controller,
+                const char *path,
+                const char *attribute,
+                char **keys,
+                char **ret_values) {
+        return cg_get_keyed_attribute_full(controller, path, attribute, keys, ret_values, 0);
+}
+
+static inline int cg_get_keyed_attribute_graceful(
+                const char *controller,
+                const char *path,
+                const char *attribute,
+                char **keys,
+                char **ret_values) {
+        return cg_get_keyed_attribute_full(controller, path, attribute, keys, ret_values, CG_KEY_MODE_GRACEFUL);
+}
+
+int cg_get_attribute_as_uint64(const char *controller, const char *path, const char *attribute, uint64_t *ret);
+
+/* Does a parse_boolean() on the attribute contents and sets ret accordingly */
+int cg_get_attribute_as_bool(const char *controller, const char *path, const char *attribute, bool *ret);
+
+int cg_get_owner(const char *path, uid_t *ret_uid);
+
+int cg_set_xattr(const char *path, const char *name, const void *value, size_t size, int flags);
+int cg_get_xattr(const char *path, const char *name, void *value, size_t size);
+int cg_get_xattr_malloc(const char *path, const char *name, char **ret);
+/* Returns negative on error, and 0 or 1 on success for the bool value */
+int cg_get_xattr_bool(const char *path, const char *name);
+int cg_remove_xattr(const char *path, const char *name);
+
+int cg_install_release_agent(const char *controller, const char *agent);
+int cg_uninstall_release_agent(const char *controller);
+
+int cg_is_empty(const char *controller, const char *path);
+int cg_is_empty_recursive(const char *controller, const char *path);
+
+int cg_get_root_path(char **path);
+
+int cg_path_get_cgroupid(const char *path, uint64_t *ret);
+int cg_path_get_session(const char *path, char **ret_session);
+int cg_path_get_owner_uid(const char *path, uid_t *ret_uid);
+int cg_path_get_unit(const char *path, char **ret_unit);
+int cg_path_get_unit_path(const char *path, char **ret_unit);
+int cg_path_get_user_unit(const char *path, char **ret_unit);
+int cg_path_get_machine_name(const char *path, char **ret_machine);
+int cg_path_get_slice(const char *path, char **ret_slice);
+int cg_path_get_user_slice(const char *path, char **ret_slice);
+
+int cg_shift_path(const char *cgroup, const char *cached_root, const char **ret_shifted);
+int cg_pid_get_path_shifted(pid_t pid, const char *cached_root, char **ret_cgroup);
+
+int cg_pid_get_session(pid_t pid, char **ret_session);
+int cg_pid_get_owner_uid(pid_t pid, uid_t *ret_uid);
+int cg_pid_get_unit(pid_t pid, char **ret_unit);
+int cg_pidref_get_unit(const PidRef *pidref, char **ret);
+int cg_pid_get_user_unit(pid_t pid, char **ret_unit);
+int cg_pid_get_machine_name(pid_t pid, char **ret_machine);
+int cg_pid_get_slice(pid_t pid, char **ret_slice);
+int cg_pid_get_user_slice(pid_t pid, char **ret_slice);
+
+int cg_path_decode_unit(const char *cgroup, char **ret_unit);
+
+bool cg_needs_escape(const char *p);
+int cg_escape(const char *p, char **ret);
+char *cg_unescape(const char *p) _pure_;
+
+bool cg_controller_is_valid(const char *p);
+
+int cg_slice_to_path(const char *unit, char **ret);
+
+typedef const char* (*cg_migrate_callback_t)(CGroupMask mask, void *userdata);
+
+int cg_mask_supported(CGroupMask *ret);
+int cg_mask_supported_subtree(const char *root, CGroupMask *ret);
+int cg_mask_from_string(const char *s, CGroupMask *ret);
+int cg_mask_to_string(CGroupMask mask, char **ret);
+
+int cg_kernel_controllers(Set **controllers);
+
+bool cg_ns_supported(void);
+bool cg_freezer_supported(void);
+bool cg_kill_supported(void);
+
+int cg_all_unified(void);
+int cg_hybrid_unified(void);
+int cg_unified_controller(const char *controller);
+int cg_unified_cached(bool flush);
+static inline int cg_unified(void) {
+        return cg_unified_cached(true);
+}
+
+const char* cgroup_controller_to_string(CGroupController c) _const_;
+CGroupController cgroup_controller_from_string(const char *s) _pure_;
+
+bool is_cgroup_fs(const struct statfs *s);
+bool fd_is_cgroup_fs(int fd);
+
+typedef enum ManagedOOMMode {
+        MANAGED_OOM_AUTO,
+        MANAGED_OOM_KILL,
+        _MANAGED_OOM_MODE_MAX,
+        _MANAGED_OOM_MODE_INVALID = -EINVAL,
+} ManagedOOMMode;
+
+const char* managed_oom_mode_to_string(ManagedOOMMode m) _const_;
+ManagedOOMMode managed_oom_mode_from_string(const char *s) _pure_;
+
+typedef enum ManagedOOMPreference {
+        MANAGED_OOM_PREFERENCE_NONE = 0,
+        MANAGED_OOM_PREFERENCE_AVOID = 1,
+        MANAGED_OOM_PREFERENCE_OMIT = 2,
+        _MANAGED_OOM_PREFERENCE_MAX,
+        _MANAGED_OOM_PREFERENCE_INVALID = -EINVAL,
+} ManagedOOMPreference;
+
+const char* managed_oom_preference_to_string(ManagedOOMPreference a) _const_;
+ManagedOOMPreference managed_oom_preference_from_string(const char *s) _pure_;
+
+/* The structure to pass to name_to_handle_at() on cgroupfs2 */
+typedef union {
+        struct file_handle file_handle;
+        uint8_t space[offsetof(struct file_handle, f_handle) + sizeof(uint64_t)];
+} cg_file_handle;
+
+#define CG_FILE_HANDLE_INIT { .file_handle.handle_bytes = sizeof(uint64_t) }
+#define CG_FILE_HANDLE_CGROUPID(fh) (*(uint64_t*) (fh).file_handle.f_handle)