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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef NETDATA_EBPF_H
#define NETDATA_EBPF_H 1
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include <stdlib.h> // Necessary for stdtoul
#define NETDATA_DEBUGFS "/sys/kernel/debug/tracing/"
#define NETDATA_KALLSYMS "/proc/kallsyms"
// Config files
#define EBPF_GLOBAL_SECTION "global"
#define EBPF_CFG_LOAD_MODE "ebpf load mode"
#define EBPF_CFG_LOAD_MODE_DEFAULT "entry"
#define EBPF_CFG_LOAD_MODE_RETURN "return"
#define EBPF_MAX_MODE_LENGTH 6
#define EBPF_CFG_UPDATE_EVERY "update every"
#define EBPF_CFG_PID_SIZE "pid table size"
#define EBPF_CFG_APPLICATION "apps"
#define EBPF_CFG_CGROUP "cgroups"
/**
* The next magic number is got doing the following math:
* 294960 = 4*65536 + 11*256 + 0
*
* For more details, please, read /usr/include/linux/version.h
*/
#define NETDATA_MINIMUM_EBPF_KERNEL 264960
/**
* The RedHat magic number was got doing:
*
* 1797 = 7*256 + 5
*
* For more details, please, read /usr/include/linux/version.h
* in any Red Hat installation.
*/
#define NETDATA_MINIMUM_RH_VERSION 1797
/**
* 2048 = 8*256 + 0
*/
#define NETDATA_RH_8 2048
/**
* Kernel 5.11
*
* 330240 = 5*65536 + 11*256
*/
#define NETDATA_EBPF_KERNEL_5_11 330496
/**
* Kernel 5.10
*
* 330240 = 5*65536 + 10*256
*/
#define NETDATA_EBPF_KERNEL_5_10 330240
/**
* Kernel 5.0
*
* 327680 = 5*65536 +256*0
*/
#define NETDATA_EBPF_KERNEL_5_0 327680
/**
* Kernel 4.17
*
* 266496 = 4*65536 + 17*256
*/
#define NETDATA_EBPF_KERNEL_4_17 266496
/**
* Kernel 4.15
*
* 265984 = 4*65536 + 15*256
*/
#define NETDATA_EBPF_KERNEL_4_15 265984
/**
* Kernel 4.11
*
* 264960 = 4*65536 + 15*256
*/
#define NETDATA_EBPF_KERNEL_4_11 264960
#define VERSION_STRING_LEN 256
#define EBPF_KERNEL_REJECT_LIST_FILE "ebpf_kernel_reject_list.txt"
#define ND_EBPF_DEFAULT_MIN_PID 1U
#define ND_EBPF_MAP_FD_NOT_INITIALIZED (int)-1
typedef struct ebpf_addresses {
char *function;
uint32_t hash;
// We use long as address, because it matches system length
unsigned long addr;
} ebpf_addresses_t;
extern char *ebpf_user_config_dir;
extern char *ebpf_stock_config_dir;
typedef struct ebpf_data {
int *map_fd;
char *kernel_string;
uint32_t running_on_kernel;
int isrh;
} ebpf_data_t;
typedef enum {
MODE_RETURN = 0, // This attaches kprobe when the function returns
MODE_DEVMODE, // This stores log given description about the errors raised
MODE_ENTRY // This attaches kprobe when the function is called
} netdata_run_mode_t;
#define ND_EBPF_DEFAULT_PID_SIZE 32768U
enum netdata_ebpf_map_type {
NETDATA_EBPF_MAP_STATIC = 0,
NETDATA_EBPF_MAP_RESIZABLE = 1,
NETDATA_EBPF_MAP_CONTROLLER = 2,
NETDATA_EBPF_MAP_CONTROLLER_UPDATED = 4,
NETDATA_EBPF_MAP_PID = 8
};
enum netdata_controller {
NETDATA_CONTROLLER_APPS_ENABLED,
NETDATA_CONTROLLER_END
};
typedef struct ebpf_local_maps {
char *name;
uint32_t internal_input;
uint32_t user_input;
uint32_t type;
int map_fd;
} ebpf_local_maps_t;
typedef struct ebpf_specify_name {
char *program_name;
char *function_to_attach;
char *optional;
bool retprobe;
} ebpf_specify_name_t;
typedef struct ebpf_module {
const char *thread_name;
const char *config_name;
int enabled;
void *(*start_routine)(void *);
int update_every;
int global_charts;
int apps_charts;
int cgroup_charts;
netdata_run_mode_t mode;
uint32_t thread_id;
int optional;
void (*apps_routine)(struct ebpf_module *em, void *ptr);
ebpf_local_maps_t *maps;
ebpf_specify_name_t *names;
uint32_t pid_map_size;
struct config *cfg;
const char *config_file;
} ebpf_module_t;
extern int ebpf_get_kernel_version();
extern int get_redhat_release();
extern int has_condition_to_run(int version);
extern char *ebpf_kernel_suffix(int version, int isrh);
extern void ebpf_update_kernel(char *ks, size_t length, int isrh, int version);
extern struct bpf_link **ebpf_load_program(char *plugins_dir,
ebpf_module_t *em,
char *kernel_string,
struct bpf_object **obj);
extern void ebpf_mount_config_name(char *filename, size_t length, char *path, const char *config);
extern int ebpf_load_config(struct config *config, char *filename);
extern void ebpf_update_module(ebpf_module_t *em);
extern void ebpf_update_names(ebpf_specify_name_t *opt, ebpf_module_t *em);
extern void ebpf_load_addresses(ebpf_addresses_t *fa, int fd);
extern void ebpf_fill_algorithms(int *algorithms, size_t length, int algorithm);
extern char **ebpf_fill_histogram_dimension(size_t maximum);
// Histogram
#define NETDATA_EBPF_HIST_MAX_BINS 24UL
#define NETDATA_DISK_MAX 256U
#define NETDATA_DISK_HISTOGRAM_LENGTH (NETDATA_DISK_MAX * NETDATA_EBPF_HIST_MAX_BINS)
typedef struct netdata_ebpf_histogram {
char *name;
char *title;
int order;
uint64_t histogram[NETDATA_EBPF_HIST_MAX_BINS];
} netdata_ebpf_histogram_t;
extern void ebpf_histogram_dimension_cleanup(char **ptr, size_t length);
// Tracepoint helpers
// For more information related to tracepoints read https://www.kernel.org/doc/html/latest/trace/tracepoints.html
extern int ebpf_is_tracepoint_enabled(char *subsys, char *eventname);
extern int ebpf_enable_tracing_values(char *subsys, char *eventname);
extern int ebpf_disable_tracing_values(char *subsys, char *eventname);
#endif /* NETDATA_EBPF_H */
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