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// SPDX-License-Identifier: GPL-3.0-or-later
#include "ebpf.h"
#include "ebpf_mount.h"
static ebpf_local_maps_t mount_maps[] = {{.name = "tbl_mount", .internal_input = NETDATA_MOUNT_END,
.user_input = 0, .type = NETDATA_EBPF_MAP_STATIC,
.map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED,
#ifdef LIBBPF_MAJOR_VERSION
.map_type = BPF_MAP_TYPE_PERCPU_ARRAY
#endif
},
{.name = NULL, .internal_input = 0, .user_input = 0,
.type = NETDATA_EBPF_MAP_CONTROLLER,
.map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED,
#ifdef LIBBPF_MAJOR_VERSION
.map_type = BPF_MAP_TYPE_PERCPU_ARRAY
#endif
}};
static char *mount_dimension_name[NETDATA_EBPF_MOUNT_SYSCALL] = { "mount", "umount" };
static netdata_syscall_stat_t mount_aggregated_data[NETDATA_EBPF_MOUNT_SYSCALL];
static netdata_publish_syscall_t mount_publish_aggregated[NETDATA_EBPF_MOUNT_SYSCALL];
struct config mount_config = { .first_section = NULL, .last_section = NULL, .mutex = NETDATA_MUTEX_INITIALIZER,
.index = {.avl_tree = { .root = NULL, .compar = appconfig_section_compare },
.rwlock = AVL_LOCK_INITIALIZER } };
static netdata_idx_t mount_hash_values[NETDATA_MOUNT_END];
netdata_ebpf_targets_t mount_targets[] = { {.name = "mount", .mode = EBPF_LOAD_TRAMPOLINE},
{.name = "umount", .mode = EBPF_LOAD_TRAMPOLINE},
{.name = NULL, .mode = EBPF_LOAD_TRAMPOLINE}};
#ifdef LIBBPF_MAJOR_VERSION
/*****************************************************************
*
* BTF FUNCTIONS
*
*****************************************************************/
/*
* Disable probe
*
* Disable all probes to use exclusively another method.
*
* @param obj is the main structure for bpf objects.
*/
static inline void ebpf_mount_disable_probe(struct mount_bpf *obj)
{
bpf_program__set_autoload(obj->progs.netdata_mount_probe, false);
bpf_program__set_autoload(obj->progs.netdata_umount_probe, false);
bpf_program__set_autoload(obj->progs.netdata_mount_retprobe, false);
bpf_program__set_autoload(obj->progs.netdata_umount_retprobe, false);
}
/*
* Disable tracepoint
*
* Disable all tracepoints to use exclusively another method.
*
* @param obj is the main structure for bpf objects.
*/
static inline void ebpf_mount_disable_tracepoint(struct mount_bpf *obj)
{
bpf_program__set_autoload(obj->progs.netdata_mount_exit, false);
bpf_program__set_autoload(obj->progs.netdata_umount_exit, false);
}
/*
* Disable trampoline
*
* Disable all trampoline to use exclusively another method.
*
* @param obj is the main structure for bpf objects.
*/
static inline void ebpf_mount_disable_trampoline(struct mount_bpf *obj)
{
bpf_program__set_autoload(obj->progs.netdata_mount_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_umount_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_mount_fexit, false);
bpf_program__set_autoload(obj->progs.netdata_umount_fexit, false);
}
/**
* Set trampoline target
*
* Set the targets we will monitor.
*
* @param obj is the main structure for bpf objects.
*/
static inline void netdata_set_trampoline_target(struct mount_bpf *obj)
{
char syscall[NETDATA_EBPF_MAX_SYSCALL_LENGTH + 1];
ebpf_select_host_prefix(syscall, NETDATA_EBPF_MAX_SYSCALL_LENGTH,
mount_targets[NETDATA_MOUNT_SYSCALL].name, running_on_kernel);
bpf_program__set_attach_target(obj->progs.netdata_mount_fentry, 0,
syscall);
bpf_program__set_attach_target(obj->progs.netdata_mount_fexit, 0,
syscall);
ebpf_select_host_prefix(syscall, NETDATA_EBPF_MAX_SYSCALL_LENGTH,
mount_targets[NETDATA_UMOUNT_SYSCALL].name, running_on_kernel);
bpf_program__set_attach_target(obj->progs.netdata_umount_fentry, 0,
syscall);
bpf_program__set_attach_target(obj->progs.netdata_umount_fexit, 0,
syscall);
}
/**
* Mount Attach Probe
*
* Attach probes to target
*
* @param obj is the main structure for bpf objects.
*
* @return It returns 0 on success and -1 otherwise.
*/
static int ebpf_mount_attach_probe(struct mount_bpf *obj)
{
char syscall[NETDATA_EBPF_MAX_SYSCALL_LENGTH + 1];
ebpf_select_host_prefix(syscall, NETDATA_EBPF_MAX_SYSCALL_LENGTH,
mount_targets[NETDATA_MOUNT_SYSCALL].name, running_on_kernel);
obj->links.netdata_mount_probe = bpf_program__attach_kprobe(obj->progs.netdata_mount_probe,
false, syscall);
int ret = (int)libbpf_get_error(obj->links.netdata_mount_probe);
if (ret)
return -1;
obj->links.netdata_mount_retprobe = bpf_program__attach_kprobe(obj->progs.netdata_mount_retprobe,
true, syscall);
ret = (int)libbpf_get_error(obj->links.netdata_mount_retprobe);
if (ret)
return -1;
ebpf_select_host_prefix(syscall, NETDATA_EBPF_MAX_SYSCALL_LENGTH,
mount_targets[NETDATA_UMOUNT_SYSCALL].name, running_on_kernel);
obj->links.netdata_umount_probe = bpf_program__attach_kprobe(obj->progs.netdata_umount_probe,
false, syscall);
ret = (int)libbpf_get_error(obj->links.netdata_umount_probe);
if (ret)
return -1;
obj->links.netdata_umount_retprobe = bpf_program__attach_kprobe(obj->progs.netdata_umount_retprobe,
true, syscall);
ret = (int)libbpf_get_error(obj->links.netdata_umount_retprobe);
if (ret)
return -1;
return 0;
}
/**
* Set hash tables
*
* Set the values for maps according the value given by kernel.
*
* @param obj is the main structure for bpf objects.
*/
static void ebpf_mount_set_hash_tables(struct mount_bpf *obj)
{
mount_maps[NETDATA_KEY_MOUNT_TABLE].map_fd = bpf_map__fd(obj->maps.tbl_mount);
}
/**
* Load and attach
*
* Load and attach the eBPF code in kernel.
*
* @param obj is the main structure for bpf objects.
* @param em structure with configuration
*
* @return it returns 0 on success and -1 otherwise
*/
static inline int ebpf_mount_load_and_attach(struct mount_bpf *obj, ebpf_module_t *em)
{
netdata_ebpf_targets_t *mt = em->targets;
netdata_ebpf_program_loaded_t test = mt[NETDATA_MOUNT_SYSCALL].mode;
// We are testing only one, because all will have the same behavior
if (test == EBPF_LOAD_TRAMPOLINE ) {
ebpf_mount_disable_probe(obj);
ebpf_mount_disable_tracepoint(obj);
netdata_set_trampoline_target(obj);
} else if (test == EBPF_LOAD_PROBE ||
test == EBPF_LOAD_RETPROBE ) {
ebpf_mount_disable_tracepoint(obj);
ebpf_mount_disable_trampoline(obj);
} else {
ebpf_mount_disable_probe(obj);
ebpf_mount_disable_trampoline(obj);
}
ebpf_update_map_type(obj->maps.tbl_mount, &mount_maps[NETDATA_KEY_MOUNT_TABLE]);
int ret = mount_bpf__load(obj);
if (!ret) {
if (test != EBPF_LOAD_PROBE && test != EBPF_LOAD_RETPROBE )
ret = mount_bpf__attach(obj);
else
ret = ebpf_mount_attach_probe(obj);
if (!ret)
ebpf_mount_set_hash_tables(obj);
}
return ret;
}
#endif
/*****************************************************************
*
* FUNCTIONS TO CLOSE THE THREAD
*
*****************************************************************/
/**
* Obsolete global
*
* Obsolete global charts created by thread.
*
* @param em a pointer to `struct ebpf_module`
*/
static void ebpf_obsolete_mount_global(ebpf_module_t *em)
{
ebpf_write_chart_obsolete(NETDATA_EBPF_MOUNT_GLOBAL_FAMILY,
NETDATA_EBPF_MOUNT_CALLS,<
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