diff options
Diffstat (limited to 'libnetdata/ebpf/ebpf.c')
| -rw-r--r-- | libnetdata/ebpf/ebpf.c | 1618 |
1 files changed, 0 insertions, 1618 deletions
diff --git a/libnetdata/ebpf/ebpf.c b/libnetdata/ebpf/ebpf.c deleted file mode 100644 index 99f23b9c0..000000000 --- a/libnetdata/ebpf/ebpf.c +++ /dev/null @@ -1,1618 +0,0 @@ -// SPDX-License-Identifier: GPL-3.0-or-later - -#include <sys/types.h> -#include <sys/stat.h> -#include <fcntl.h> -#include <dlfcn.h> -#include <sys/utsname.h> - -#include "../libnetdata.h" - -char *ebpf_user_config_dir = CONFIG_DIR; -char *ebpf_stock_config_dir = LIBCONFIG_DIR; - -/* -static int clean_kprobe_event(FILE *out, char *filename, char *father_pid, netdata_ebpf_events_t *ptr) -{ - int fd = open(filename, O_WRONLY | O_APPEND, 0); - if (fd < 0) { - if (out) { - fprintf(out, "Cannot open %s : %s\n", filename, strerror(errno)); - } - return 1; - } - - char cmd[1024]; - int length = snprintf(cmd, 1023, "-:kprobes/%c_netdata_%s_%s", ptr->type, ptr->name, father_pid); - int ret = 0; - if (length > 0) { - ssize_t written = write(fd, cmd, strlen(cmd)); - if (written < 0) { - if (out) { - fprintf( - out, "Cannot remove the event (%d, %d) '%s' from %s : %s\n", getppid(), getpid(), cmd, filename, - strerror((int)errno)); - } - ret = 1; - } - } - - close(fd); - - return ret; -} - -int clean_kprobe_events(FILE *out, int pid, netdata_ebpf_events_t *ptr) -{ - char filename[FILENAME_MAX + 1]; - snprintf(filename, FILENAME_MAX, "%s%s", NETDATA_DEBUGFS, "kprobe_events"); - - char removeme[16]; - snprintf(removeme, 15, "%d", pid); - - int i; - for (i = 0; ptr[i].name; i++) { - if (clean_kprobe_event(out, filename, removeme, &ptr[i])) { - break; - } - } - - return 0; -} -*/ - -//---------------------------------------------------------------------------------------------------------------------- - -/** - * Get Kernel version - * - * Get the current kernel from /proc and returns an integer value representing it - * - * @return it returns a value representing the kernel version. - */ -int ebpf_get_kernel_version() -{ - char major[16], minor[16], patch[16]; - char ver[VERSION_STRING_LEN]; - char *version = ver; - - int fd = open("/proc/sys/kernel/osrelease", O_RDONLY); - if (fd < 0) - return -1; - - ssize_t len = read(fd, ver, sizeof(ver)); - if (len < 0) { - close(fd); - return -1; - } - - close(fd); - - char *move = major; - while (*version && *version != '.') - *move++ = *version++; - *move = '\0'; - - version++; - move = minor; - while (*version && *version != '.') - *move++ = *version++; - *move = '\0'; - - if (*version) - version++; - else - return -1; - - move = patch; - while (*version && *version != '\n' && *version != '-') - *move++ = *version++; - *move = '\0'; - - // This new rule is fixing kernel version according the formula: - // KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + ((c) > 255 ? 255 : (c))) - // that was extracted from /usr/include/linux/version.h - int ipatch = (int)str2l(patch); - if (ipatch > 255) - ipatch = 255; - - return ((int)(str2l(major) * 65536) + (int)(str2l(minor) * 256) + ipatch); -} - -/** - * Get RH release - * - * Read Red Hat release from /etc/redhat-release - * - * @return It returns RH release on success and -1 otherwise - */ -int get_redhat_release() -{ - char buffer[VERSION_STRING_LEN + 1]; - int major, minor; - FILE *fp = fopen("/etc/redhat-release", "r"); - - if (fp) { - major = 0; - minor = -1; - size_t length = fread(buffer, sizeof(char), VERSION_STRING_LEN, fp); - if (length > 4) { - buffer[length] = '\0'; - char *end = strchr(buffer, '.'); - char *start; - if (end) { - *end = 0x0; - - if (end > buffer) { - start = end - 1; - - major = strtol(start, NULL, 10); - start = ++end; - - end++; - if (end) { - end = 0x00; - minor = strtol(start, NULL, 10); - } else { - minor = -1; - } - } - } - } - - fclose(fp); - return ((major * 256) + minor); - } else { - return -1; - } -} - -/** - * Check if the kernel is in a list of rejected ones - * - * @return Returns 1 if the kernel is rejected, 0 otherwise. - */ -static int kernel_is_rejected() -{ - // Get kernel version from system - char version_string[VERSION_STRING_LEN + 1]; - int version_string_len = 0; - - if (read_file("/proc/version_signature", version_string, VERSION_STRING_LEN)) { - if (read_file("/proc/version", version_string, VERSION_STRING_LEN)) { - struct utsname uname_buf; - if (!uname(&uname_buf)) { - netdata_log_info("Cannot check kernel version"); - return 0; - } - version_string_len = - snprintfz(version_string, VERSION_STRING_LEN, "%s %s", uname_buf.release, uname_buf.version); - } - } - - if (!version_string_len) - version_string_len = strlen(version_string); - - // Open a file with a list of rejected kernels - char *config_dir = getenv("NETDATA_USER_CONFIG_DIR"); - if (config_dir == NULL) { - config_dir = CONFIG_DIR; - } - - char filename[FILENAME_MAX + 1]; - snprintfz(filename, FILENAME_MAX, "%s/ebpf.d/%s", config_dir, EBPF_KERNEL_REJECT_LIST_FILE); - FILE *kernel_reject_list = fopen(filename, "r"); - - if (!kernel_reject_list) { - // Keep this to have compatibility with old versions - snprintfz(filename, FILENAME_MAX, "%s/%s", config_dir, EBPF_KERNEL_REJECT_LIST_FILE); - kernel_reject_list = fopen(filename, "r"); - - if (!kernel_reject_list) { - config_dir = getenv("NETDATA_STOCK_CONFIG_DIR"); - if (config_dir == NULL) { - config_dir = LIBCONFIG_DIR; - } - - snprintfz(filename, FILENAME_MAX, "%s/ebpf.d/%s", config_dir, EBPF_KERNEL_REJECT_LIST_FILE); - kernel_reject_list = fopen(filename, "r"); - - if (!kernel_reject_list) - return 0; - } - } - - // Find if the kernel is in the reject list - char *reject_string = NULL; - size_t buf_len = 0; - ssize_t reject_string_len; - while ((reject_string_len = getline(&reject_string, &buf_len, kernel_reject_list) - 1) > 0) { - if (version_string_len >= reject_string_len) { - if (!strncmp(version_string, reject_string, reject_string_len)) { - netdata_log_info("A buggy kernel is detected"); - fclose(kernel_reject_list); - freez(reject_string); - return 1; - } - } - } - - fclose(kernel_reject_list); - free(reject_string); - - return 0; -} - -static int has_ebpf_kernel_version(int version) -{ - if (kernel_is_rejected()) - return 0; - - // Kernel 4.11.0 or RH > 7.5 - return (version >= NETDATA_MINIMUM_EBPF_KERNEL || get_redhat_release() >= NETDATA_MINIMUM_RH_VERSION); -} - -int has_condition_to_run(int version) -{ - if (!has_ebpf_kernel_version(version)) - return 0; - - return 1; -} - -//---------------------------------------------------------------------------------------------------------------------- - -/** - * Kernel Name - * - * Select kernel name used by eBPF programs - * - * Netdata delivers for users eBPF programs with specific suffixes that represent the kernels they were - * compiled, when we load the eBPF program, the suffix must be the nereast possible of the kernel running. - * - * @param selector select the kernel version. - * - * @return It returns the string to load kernel. - */ -static char *ebpf_select_kernel_name(uint32_t selector) -{ - static char *kernel_names[] = { NETDATA_IDX_STR_V3_10, NETDATA_IDX_STR_V4_14, NETDATA_IDX_STR_V4_16, - NETDATA_IDX_STR_V4_18, NETDATA_IDX_STR_V5_4, NETDATA_IDX_STR_V5_10, - NETDATA_IDX_STR_V5_11, NETDATA_IDX_STR_V5_14, NETDATA_IDX_STR_V5_15, - NETDATA_IDX_STR_V5_16 - }; - - return kernel_names[selector]; -} - -/** - * Select Max Index - * - * Select last index that will be tested on host. - * - * @param is_rhf is Red Hat fammily? - * @param kver the kernel version - * - * @return it returns the index to access kernel string. - */ -static int ebpf_select_max_index(int is_rhf, uint32_t kver) -{ - if (is_rhf > 0) { // Is Red Hat family - if (kver >= NETDATA_EBPF_KERNEL_5_14) - return NETDATA_IDX_V5_14; - else if (kver >= NETDATA_EBPF_KERNEL_5_4 && kver < NETDATA_EBPF_KERNEL_5_5) // For Oracle Linux - return NETDATA_IDX_V5_4; - else if (kver >= NETDATA_EBPF_KERNEL_4_11) - return NETDATA_IDX_V4_18; - } else { // Kernels from kernel.org - if (kver >= NETDATA_EBPF_KERNEL_5_16) - return NETDATA_IDX_V5_16; - else if (kver >= NETDATA_EBPF_KERNEL_5_15) - return NETDATA_IDX_V5_15; - else if (kver >= NETDATA_EBPF_KERNEL_5_11) - return NETDATA_IDX_V5_11; - else if (kver >= NETDATA_EBPF_KERNEL_5_10) - return NETDATA_IDX_V5_10; - else if (kver >= NETDATA_EBPF_KERNEL_4_17) - return NETDATA_IDX_V5_4; - else if (kver >= NETDATA_EBPF_KERNEL_4_15) - return NETDATA_IDX_V4_16; - else if (kver >= NETDATA_EBPF_KERNEL_4_11) - return NETDATA_IDX_V4_14; - } - - return NETDATA_IDX_V3_10; -} - -/** - * Select Index - * - * Select index to load data. - * - * @param kernels is the variable with kernel versions. - * @param is_rhf is Red Hat fammily? - * param kver the kernel version - */ -static uint32_t ebpf_select_index(uint32_t kernels, int is_rhf, uint32_t kver) -{ - uint32_t start = ebpf_select_max_index(is_rhf, kver); - uint32_t idx; - - if (is_rhf == -1) - kernels &= ~NETDATA_V5_14; - - for (idx = start; idx; idx--) { - if (kernels & 1 << idx) - break; - } - - return idx; -} - -/** - * Mount Name - * - * Mount name of eBPF program to be loaded. - * - * Netdata eBPF programs has the following format: - * - * Tnetdata_ebpf_N.V.o - * - * where: - * T - Is the eBPF type. When starts with 'p', this means we are only adding probes, - * and when they start with 'r' we are using retprobes. - * N - The eBPF program name. - * V - The kernel version in string format. - * - * @param out the vector where the name will be stored - * @param len the size of the out vector. - * @param path where the binaries are stored - * @param kver the kernel version - * @param name the eBPF program name. - * @param is_return is return or entry ? - */ -static void ebpf_mount_name(char *out, size_t len, char *path, uint32_t kver, const char *name, - int is_return, int is_rhf) -{ - char *version = ebpf_select_kernel_name(kver); - snprintfz(out, len, "%s/ebpf.d/%cnetdata_ebpf_%s.%s%s.o", - path, - (is_return) ? 'r' : 'p', - name, - version, - (is_rhf != -1) ? ".rhf" : ""); -} - -//---------------------------------------------------------------------------------------------------------------------- - -/** - * Statistics from targets - * - * Count the information from targets. - * - * @param report the output structure - * @param targets vector with information about the eBPF plugin. - * @param value factor used to update calculation - */ -static void ebpf_stats_targets(ebpf_plugin_stats_t *report, netdata_ebpf_targets_t *targets, int value) -{ - if (!targets) { - report->probes = report->tracepoints = report->trampolines = 0; - return; - } - - int i = 0; - while (targets[i].name) { - switch (targets[i].mode) { - case EBPF_LOAD_PROBE: { - report->probes += value; - break; - } - case EBPF_LOAD_RETPROBE: { - report->retprobes += value; - break; - } - case EBPF_LOAD_TRACEPOINT: { - report->tracepoints += value; - break; - } - case EBPF_LOAD_TRAMPOLINE: { - report->trampolines += value; - break; - } - } - - i++; - } -} - -/** - * Update General stats - * - * Update eBPF plugin statistics that has relationship with the thread. - * - * This function must be called with mutex associated to charts is locked. - * - * @param report the output structure - * @param em the structure with information about how the module/thread is working. - */ -void ebpf_update_stats(ebpf_plugin_stats_t *report, ebpf_module_t *em) -{ - int value; - - // It is not necessary to report more information. - if (em->enabled > NETDATA_THREAD_EBPF_FUNCTION_RUNNING) - value = -1; - else - value = 1; - - report->threads += value; - report->running += value; - - // In theory the `else if` is useless, because when this function is called, the module should not stay in - // EBPF_LOAD_PLAY_DICE. We have this additional condition to detect errors from developers. - if (em->load & EBPF_LOAD_LEGACY) - report->legacy += value; - else if (em->load & EBPF_LOAD_CORE) - report->core += value; - - if (em->maps_per_core) - report->hash_percpu += value; - else - report->hash_unique += value; - - ebpf_stats_targets(report, em->targets, value); -} - -/** - * Update Kernel memory with memory - * - * This algorithm is an adaptation of https://elixir.bootlin.com/linux/v6.1.14/source/tools/bpf/bpftool/common.c#L402 - * to get 'memlock' data and update report. - * - * @param report the output structure - * @param map pointer to a map. - * @param action What action will be done with this map. - */ -void ebpf_update_kernel_memory(ebpf_plugin_stats_t *report, ebpf_local_maps_t *map, ebpf_stats_action_t action) -{ - char filename[FILENAME_MAX+1]; - snprintfz(filename, FILENAME_MAX, "/proc/self/fdinfo/%d", map->map_fd); - procfile *ff = procfile_open(filename, " \t", PROCFILE_FLAG_DEFAULT); - if(unlikely(!ff)) { - netdata_log_error("Cannot open %s", filename); - return; - } - - ff = procfile_readall(ff); - if(unlikely(!ff)) - return; - - unsigned long j, lines = procfile_lines(ff); - char *memlock = { "memlock" }; - for (j = 0; j < lines ; j++) { - char *cmp = procfile_lineword(ff, j,0); - if (!strncmp(memlock, cmp, 7)) { - uint64_t memsize = (uint64_t) str2l(procfile_lineword(ff, j,1)); - switch (action) { - case EBPF_ACTION_STAT_ADD: { - report->memlock_kern += memsize; - report->hash_tables += 1; -#ifdef NETDATA_DEV_MODE - netdata_log_info("Hash table %u: %s (FD = %d) is consuming %lu bytes totalizing %lu bytes", - report->hash_tables, map->name, map->map_fd, memsize, report->memlock_kern); -#endif - break; - } - case EBPF_ACTION_STAT_REMOVE: { - report->memlock_kern -= memsize; - report->hash_tables -= 1; -#ifdef NETDATA_DEV_MODE - netdata_log_info("Hash table %s (FD = %d) was removed releasing %lu bytes, now we have %u tables loaded totalizing %lu bytes.", - map->name, map->map_fd, memsize, report->hash_tables, report->memlock_kern); -#endif - break; - } - default: { - break; - } - } - break; - } - } - - procfile_close(ff); -} - -/** - * Update Kernel memory with memory - * - * This algorithm is an adaptation of https://elixir.bootlin.com/linux/v6.1.14/source/tools/bpf/bpftool/common.c#L402 - * to get 'memlock' data and update report. - * - * @param report the output structure - * @param map pointer to a map. Last map must fish with name = NULL - * @param action should plugin add or remove values from amount. - */ -void ebpf_update_kernel_memory_with_vector(ebpf_plugin_stats_t *report, - ebpf_local_maps_t *maps, - ebpf_stats_action_t action) -{ - if (!maps) - return; - - ebpf_local_maps_t *map; - int i = 0; - for (map = &maps[i]; maps[i].name; i++, map = &maps[i]) { - int fd = map->map_fd; - if (fd == ND_EBPF_MAP_FD_NOT_INITIALIZED) - continue; - - ebpf_update_kernel_memory(report, map, action); - } -} - -//---------------------------------------------------------------------------------------------------------------------- - -void ebpf_update_pid_table(ebpf_local_maps_t *pid, ebpf_module_t *em) -{ - pid->user_input = em->pid_map_size; -} - -/** - * Update map size - * - * Update map size with information read from configuration files. - * - * @param map the structure with file descriptor to update. - * @param lmap the structure with information from configuration files. - * @param em the structure with information about how the module/thread is working. - * @param map_name the name of the file used to log. - */ -void ebpf_update_map_size(struct bpf_map *map, ebpf_local_maps_t *lmap, ebpf_module_t *em, const char *map_name __maybe_unused) -{ - uint32_t define_size = 0; - uint32_t apps_type = NETDATA_EBPF_MAP_PID | NETDATA_EBPF_MAP_RESIZABLE; - if (lmap->user_input && lmap->user_input != lmap->internal_input) { - define_size = lmap->internal_input; -#ifdef NETDATA_INTERNAL_CHECKS - netdata_log_info("Changing map %s from size %u to %u ", map_name, lmap->internal_input, lmap->user_input); -#endif - } else if (((lmap->type & apps_type) == apps_type) && (!em->apps_charts) && (!em->cgroup_charts)) { - lmap->user_input = ND_EBPF_DEFAULT_MIN_PID; - } else if (((em->apps_charts) || (em->cgroup_charts)) && (em->apps_level != NETDATA_APPS_NOT_SET)) { - switch (em->apps_level) { - case NETDATA_APPS_LEVEL_ALL: { - define_size = lmap->user_input; - break; - } - case NETDATA_APPS_LEVEL_PARENT: { - define_size = ND_EBPF_DEFAULT_PID_SIZE / 2; - break; - } - case NETDATA_APPS_LEVEL_REAL_PARENT: - default: { - define_size = ND_EBPF_DEFAULT_PID_SIZE / 3; - } - } - } - - if (!define_size) - return; - -#ifdef LIBBPF_MAJOR_VERSION - bpf_map__set_max_entries(map, define_size); -#else - bpf_map__resize(map, define_size); -#endif -} - -#ifdef LIBBPF_MAJOR_VERSION -/** - * Update map type - * - * Update map type with information given. - * - * @param map the map we want to modify - * @param w a structure with user input - */ -void ebpf_update_map_type(struct bpf_map *map, ebpf_local_maps_t *w) -{ - if (bpf_map__set_type(map, w->map_type)) { - netdata_log_error("Cannot modify map type for %s", w->name); - } -} - -/** - * Define map type - * - * This PR defines the type used by hash tables according user input. - * - * @param maps the list of maps used with a hash table. - * @param maps_per_core define if map type according user specification. - * @param kver kernel version host is running. - */ -void ebpf_define_map_type(ebpf_local_maps_t *maps, int maps_per_core, int kver) -{ - if (!maps) - return; - - // Before kernel 4.06 there was not percpu hash tables - if (kver < NETDATA_EBPF_KERNEL_4_06) - maps_per_core = CONFIG_BOOLEAN_NO; - - int i = 0; - while (maps[i].name) { - ebpf_local_maps_t *map = &maps[i]; - // maps_per_core is a boolean value in configuration files. - if (maps_per_core) { - if (map->map_type == BPF_MAP_TYPE_HASH) - map->map_type = BPF_MAP_TYPE_PERCPU_HASH; - else if (map->map_type == BPF_MAP_TYPE_ARRAY) - map->map_type = BPF_MAP_TYPE_PERCPU_ARRAY; - } else { - if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH) - map->map_type = BPF_MAP_TYPE_HASH; - else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) - map->map_type = BPF_MAP_TYPE_ARRAY; - } - - i++; - } -} -#endif - -/** - * Update Legacy map - * - * Update map for eBPF legacy code. - * - * @param program the structure with values read from binary. - * @param em the structure with information about how the module/thread is working. - */ -static void ebpf_update_legacy_map(struct bpf_object *program, ebpf_module_t *em) -{ - struct bpf_map *map; - ebpf_local_maps_t *maps = em->maps; - if (!maps) - return; - - bpf_map__for_each(map, program) - { - const char *map_name = bpf_map__name(map); - int i = 0; - while (maps[i].name) { - ebpf_local_maps_t *w = &maps[i]; - - if (!strcmp(w->name, map_name)) { - // Modify size - if (w->type & NETDATA_EBPF_MAP_RESIZABLE) { - ebpf_update_map_size(map, w, em, map_name); - } - -#ifdef LIBBPF_MAJOR_VERSION - ebpf_update_map_type(map, w); -#endif - } - - i++; - } - } -} - -size_t ebpf_count_programs(struct bpf_object *obj) -{ - size_t tot = 0; - struct bpf_program *prog; - bpf_object__for_each_program(prog, obj) - { - tot++; - } - - return tot; -} - -static ebpf_specify_name_t *ebpf_find_names(ebpf_specify_name_t *names, const char *prog_name) -{ - size_t i = 0; - while (names[i].program_name) { - if (!strcmp(prog_name, names[i].program_name)) - return &names[i]; - - i++; - } - - return NULL; -} - -static struct bpf_link **ebpf_attach_programs(struct bpf_object *obj, size_t length, ebpf_specify_name_t *names) -{ - struct bpf_link **links = callocz(length , sizeof(struct bpf_link *)); - size_t i = 0; - struct bpf_program *prog; - ebpf_specify_name_t *w; - bpf_object__for_each_program(prog, obj) - { - if (names) { - const char *name = bpf_program__name(prog); - w = ebpf_find_names(names, name); - } else - w = NULL; - - if (w) { - enum bpf_prog_type type = bpf_program__get_type(prog); - if (type == BPF_PROG_TYPE_KPROBE) - links[i] = bpf_program__attach_kprobe(prog, w->retprobe, w->optional); - } else - links[i] = bpf_program__attach(prog); - - if (libbpf_get_error(links[i])) { - links[i] = NULL; - } - - i++; - } - - return links; -} - -static void ebpf_update_maps(ebpf_module_t *em, struct bpf_object *obj) -{ - if (!em->maps) - return; - - ebpf_local_maps_t *maps = em->maps; - struct bpf_map *map; - bpf_map__for_each(map, obj) - { - int fd = bpf_map__fd(map); - if (maps) { - const char *map_name = bpf_map__name(map); - int j = 0; ; - while (maps[j].name) { - ebpf_local_maps_t *w = &maps[j]; - if (w->map_fd == ND_EBPF_MAP_FD_NOT_INITIALIZED && !strcmp(map_name, w->name)) - w->map_fd = fd; - - j++; - } - } - } -} - -/** - * Update Controller - * - * Update controller value with user input. - * - * @param fd the table file descriptor - * @param em structure with information about eBPF program we will load. - */ -void ebpf_update_controller(int fd, ebpf_module_t *em) -{ - uint32_t values[NETDATA_CONTROLLER_END] = { - (em->apps_charts & NETDATA_EBPF_APPS_FLAG_YES) | em->cgroup_charts, - em->apps_level, 0, 0, 0, 0 - }; - uint32_t key; - uint32_t end = NETDATA_CONTROLLER_PID_TABLE_ADD; - - for (key = NETDATA_CONTROLLER_APPS_ENABLED; key < end; key++) { - int ret = bpf_map_update_elem(fd, &key, &values[key], BPF_ANY); - if (ret) - netdata_log_error("Add key(%u) for controller table failed.", key); - } -} - -/** - * Update Legacy controller - * - * Update legacy controller table when eBPF program has it. - * - * @param em structure with information about eBPF program we will load. - * @param obj bpf object with tables. - */ -static void ebpf_update_legacy_controller(ebpf_module_t *em, struct bpf_object *obj) -{ - ebpf_local_maps_t *maps = em->maps; - if (!maps) - return; - - struct bpf_map *map; - bpf_map__for_each(map, obj) - { - size_t i = 0; - while (maps[i].name) { - ebpf_local_maps_t *w = &maps[i]; - if (w->map_fd != ND_EBPF_MAP_FD_NOT_INITIALIZED && (w->type & NETDATA_EBPF_MAP_CONTROLLER)) { - w->type &= ~NETDATA_EBPF_MAP_CONTROLLER; - w->type |= NETDATA_EBPF_MAP_CONTROLLER_UPDATED; - - ebpf_update_controller(w->map_fd, em); - } - i++; - } - } -} - -/** - * Load Program - * - * Load eBPF program into kernel - * - * @param plugins_dir directory where binary are stored - * @param em structure with information about eBPF program we will load. - * @param kver the kernel version according /usr/include/linux/version.h - * @param is_rhf is a kernel from Red Hat Family? - * @param obj structure where we will store object loaded. - * - * @return it returns a link for each target we associated an eBPF program. - */ -struct bpf_link **ebpf_load_program(char *plugins_dir, ebpf_module_t *em, int kver, int is_rhf, - struct bpf_object **obj) -{ - char lpath[4096]; - - uint32_t idx = ebpf_select_index(em->kernels, is_rhf, kver); - - ebpf_mount_name(lpath, 4095, plugins_dir, idx, em->info.thread_name, em->mode, is_rhf); - - // When this function is called ebpf.plugin is using legacy code, so we should reset the variable - em->load &= ~ NETDATA_EBPF_LOAD_METHODS; - em->load |= EBPF_LOAD_LEGACY; - - *obj = bpf_object__open_file(lpath, NULL); - if (!*obj) - return NULL; - - if (libbpf_get_error(obj)) { - bpf_object__close(*obj); - return NULL; - } - - ebpf_update_legacy_map(*obj, em); - - if (bpf_object__load(*obj)) { - netdata_log_error("ERROR: loading BPF object file failed %s\n", lpath); - bpf_object__close(*obj); - return NULL; - } - - ebpf_update_maps(em, *obj); - ebpf_update_legacy_controller(em, *obj); - - size_t count_programs = ebpf_count_programs(*obj); - -#ifdef NETDATA_INTERNAL_CHECKS - netdata_log_info("eBPF program %s loaded with success!", lpath); -#endif - - return ebpf_attach_programs(*obj, count_programs, em->names); -} - -char *ebpf_find_symbol(char *search) -{ - char filename[FILENAME_MAX + 1]; - char *ret = NULL; - snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, NETDATA_KALLSYMS); - procfile *ff = procfile_open(filename, " \t", PROCFILE_FLAG_DEFAULT); - if(unlikely(!ff)) { - netdata_log_error("Cannot open %s%s", netdata_configured_host_prefix, NETDATA_KALLSYMS); - return ret; - } - - ff = procfile_readall(ff); - if(unlikely(!ff)) - return ret; - - unsigned long i, lines = procfile_lines(ff); - size_t length = strlen(search); - for(i = 0; i < lines ; i++) { - char *cmp = procfile_lineword(ff, i,2);; - if (!strncmp(search, cmp, length)) { - ret = strdupz(cmp); - break; - } - } - - procfile_close(ff); - - return ret; -} - -void ebpf_update_names(ebpf_specify_name_t *opt, ebpf_module_t *em) -{ - int mode = em->mode; - em->names = opt; - - size_t i = 0; - while (opt[i].program_name) { - opt[i].retprobe = (mode == MODE_RETURN); - opt[i].optional = ebpf_find_symbol(opt[i].function_to_attach); - - i++; - } -} - -//---------------------------------------------------------------------------------------------------------------------- - -void ebpf_mount_config_name(char *filename, size_t length, char *path, const char *config) -{ - snprintf(filename, length, "%s/ebpf.d/%s", path, config); -} - -int ebpf_load_config(struct config *config, char *filename) -{ - return appconfig_load(config, filename, 0, NULL); -} - - -static netdata_run_mode_t ebpf_select_mode(char *mode) -{ - if (!strcasecmp(mode,EBPF_CFG_LOAD_MODE_RETURN )) - return MODE_RETURN; - else if (!strcasecmp(mode, "dev")) - return MODE_DEVMODE; - - return MODE_ENTRY; -} - -static void ebpf_select_mode_string(char *output, size_t len, netdata_run_mode_t sel) -{ - if (sel == MODE_RETURN) - strncpyz(output, EBPF_CFG_LOAD_MODE_RETURN, len); - else - strncpyz(output, EBPF_CFG_LOAD_MODE_DEFAULT, len); -} - -/** - * Convert string to load mode - * - * Convert the string given as argument to value present in enum. - * - * @param str value read from configuration file. - * - * @return It returns the value to be used. - */ -netdata_ebpf_load_mode_t epbf_convert_string_to_load_mode(char *str) -{ - if (!strcasecmp(str, EBPF_CFG_CORE_PROGRAM)) - return EBPF_LOAD_CORE; - else if (!strcasecmp(str, EBPF_CFG_LEGACY_PROGRAM)) - return EBPF_LOAD_LEGACY; - - return EBPF_LOAD_PLAY_DICE; -} - -/** - * Convert load mode to string - * - * @param mode value that will select the string - * - * @return It returns the string associated to mode. - */ -static char *ebpf_convert_load_mode_to_string(netdata_ebpf_load_mode_t mode) -{ - if (mode & EBPF_LOAD_CORE) - return EBPF_CFG_CORE_PROGRAM; - else if (mode & EBPF_LOAD_LEGACY) - return EBPF_CFG_LEGACY_PROGRAM; - - return EBPF_CFG_DEFAULT_PROGRAM; -} - -/** - * Convert collect pid to string - * - * @param level value that will select the string - * - * @return It returns the string associated to level. - */ -static char *ebpf_convert_collect_pid_to_string(netdata_apps_level_t level) -{ - if (level == NETDATA_APPS_LEVEL_REAL_PARENT) - return EBPF_CFG_PID_REAL_PARENT; - else if (level == NETDATA_APPS_LEVEL_PARENT) - return EBPF_CFG_PID_PARENT; - else if (level == NETDATA_APPS_LEVEL_ALL) - return EBPF_CFG_PID_ALL; - - return EBPF_CFG_PID_INTERNAL_USAGE; -} - -/** - * Convert string to apps level - * - * @param str the argument read from config files - * - * @return it returns the level associated to the string or default when it is a wrong value - */ -netdata_apps_level_t ebpf_convert_string_to_apps_level(char *str) -{ - if (!strcasecmp(str, EBPF_CFG_PID_REAL_PARENT)) - return NETDATA_APPS_LEVEL_REAL_PARENT; - else if (!strcasecmp(str, EBPF_CFG_PID_PARENT)) - return NETDATA_APPS_LEVEL_PARENT; - else if (!strcasecmp(str, EBPF_CFG_PID_ALL)) - return NETDATA_APPS_LEVEL_ALL; - - return NETDATA_APPS_NOT_SET; -} - -/** - * CO-RE type - * - * Select the preferential type of CO-RE - * - * @param str value read from configuration file. - * @param lmode load mode used by collector. - */ -netdata_ebpf_program_loaded_t ebpf_convert_core_type(char *str, netdata_run_mode_t lmode) -{ - if (!strcasecmp(str, EBPF_CFG_ATTACH_TRACEPOINT)) - return EBPF_LOAD_TRACEPOINT; - else if (!strcasecmp(str, EBPF_CFG_ATTACH_PROBE)) { - return (lmode == MODE_ENTRY) ? EBPF_LOAD_PROBE : EBPF_LOAD_RETPROBE; - } - - return EBPF_LOAD_TRAMPOLINE; -} - -#ifdef LIBBPF_MAJOR_VERSION -/** - * Adjust Thread Load - * - * Adjust thread configuration according specified load. - * - * @param mod the main structure that will be adjusted. - * @param file the btf file used with thread. - */ -void ebpf_adjust_thread_load(ebpf_module_t *mod, struct btf *file) -{ - if (!file) { - mod->load &= ~EBPF_LOAD_CORE; - mod->load |= EBPF_LOAD_LEGACY; - } else if (mod->load == EBPF_LOAD_PLAY_DICE && file) { - mod->load &= ~EBPF_LOAD_LEGACY; - mod->load |= EBPF_LOAD_CORE; - } -} - -/** - * Parse BTF file - * - * Parse a specific BTF file present on filesystem - * - * @param filename the file that will be parsed. - * - * @return It returns a pointer for the file on success and NULL otherwise. - */ -struct btf *ebpf_parse_btf_file(const char *filename) -{ - struct btf *bf = btf__parse(filename, NULL); - if (libbpf_get_error(bf)) { - fprintf(stderr, "Cannot parse btf file"); - btf__free(bf); - return NULL; - } - - return bf; -} - -/** - * Load default btf file - * - * Load the default BTF file on environment. - * - * @param path is the fullpath - * @param filename is the file inside BTF path. - */ -struct btf *ebpf_load_btf_file(char *path, char *filename) -{ - char fullpath[PATH_MAX + 1]; - snprintfz(fullpath, PATH_MAX, "%s/%s", path, filename); - struct btf *ret = ebpf_parse_btf_file(fullpath); - if (!ret) - netdata_log_info("Your environment does not have BTF file %s/%s. The plugin will work with 'legacy' code.", - path, filename); - - return ret; -} - -/** - * Find BTF attach type - * - * Search type fr current btf file. - * - * @param file is the structure for the btf file already parsed. - */ -static inline const struct btf_type *ebpf_find_btf_attach_type(struct btf *file) -{ - int id = btf__find_by_name_kind(file, "bpf_attach_type", BTF_KIND_ENUM); - if (id < 0) { - fprintf(stderr, "Cannot find 'bpf_attach_type'"); - - return NULL; - } - - return btf__type_by_id(file, id); -} - -/** - * Is function inside BTF - * - * Look for a specific function inside the given BTF file. - * - * @param file is the structure for the btf file already parsed. - * @param function is the function that we want to find. - */ -int ebpf_is_function_inside_btf(struct btf *file, char *function) -{ - const struct btf_type *type = ebpf_find_btf_attach_type(file); - if (!type) - return -1; - - const struct btf_enum *e = btf_enum(type); - int i, id; - for (id = -1, i = 0; i < btf_vlen(type); i++, e++) { - if (!strcmp(btf__name_by_offset(file, e->name_off), "BPF_TRACE_FENTRY")) { - id = btf__find_by_name_kind(file, function, BTF_KIND_FUNC); - break; - } - } - - return (id > 0) ? 1 : 0; -} -#endif - -/** - * Update target with configuration - * - * Update target load mode with value. - * - * @param em the module structure - * @param value value used to update. - */ -static void ebpf_update_target_with_conf(ebpf_module_t *em, netdata_ebpf_program_loaded_t value) -{ - netdata_ebpf_targets_t *targets = em->targets; - if (!targets) { - return; - } - - int i = 0; - while (targets[i].name) { - targets[i].mode = value; - i++; - } -} - -/** - * Select Load Mode - * - * Select the load mode according the given inputs. - * - * @param btf_file a pointer to the loaded btf file. - * @parma load current value. - * @param btf_file a pointer to the loaded btf file. - * @param is_rhf is Red Hat family? - * - * @return it returns the new load mode. - */ -static netdata_ebpf_load_mode_t ebpf_select_load_mode(struct btf *btf_file, netdata_ebpf_load_mode_t load, - int kver, int is_rh) -{ -#ifdef LIBBPF_MAJOR_VERSION - if ((load & EBPF_LOAD_CORE) || (load & EBPF_LOAD_PLAY_DICE)) { - // Quick fix for Oracle linux 8.x - load = (!btf_file || (is_rh && (kver >= NETDATA_EBPF_KERNEL_5_4 && kver < NETDATA_EBPF_KERNEL_5_5))) ? - EBPF_LOAD_LEGACY : EBPF_LOAD_CORE; - } -#else - load = EBPF_LOAD_LEGACY; -#endif - - return load; -} - -/** - * Update Module using config - * - * Update configuration for a specific thread. - * - * @param modules structure that will be updated - * @param origin specify the configuration file loaded - * @param btf_file a pointer to the loaded btf file. - * @param is_rhf is Red Hat family? - */ -void ebpf_update_module_using_config(ebpf_module_t *modules, netdata_ebpf_load_mode_t origin, struct btf *btf_file, - int kver, int is_rh) -{ - char default_value[EBPF_MAX_MODE_LENGTH + 1]; - ebpf_select_mode_string(default_value, EBPF_MAX_MODE_LENGTH, modules->mode); - char *load_mode = appconfig_get(modules->cfg, EBPF_GLOBAL_SECTION, EBPF_CFG_LOAD_MODE, default_value); - modules->mode = ebpf_select_mode(load_mode); - - modules->update_every = (int)appconfig_get_number(modules->cfg, EBPF_GLOBAL_SECTION, - EBPF_CFG_UPDATE_EVERY, modules->update_every); - - modules->apps_charts = appconfig_get_boolean(modules->cfg, EBPF_GLOBAL_SECTION, EBPF_CFG_APPLICATION, - (int) (modules->apps_charts & NETDATA_EBPF_APPS_FLAG_YES)); - - modules->cgroup_charts = appconfig_get_boolean(modules->cfg, EBPF_GLOBAL_SECTION, EBPF_CFG_CGROUP, - modules->cgroup_charts); - - modules->pid_map_size = (uint32_t)appconfig_get_number(modules->cfg, EBPF_GLOBAL_SECTION, EBPF_CFG_PID_SIZE, - modules->pid_map_size); - - modules->lifetime = (uint32_t) appconfig_get_number(modules->cfg, EBPF_GLOBAL_SECTION, - EBPF_CFG_LIFETIME, EBPF_DEFAULT_LIFETIME); - - char *value = ebpf_convert_load_mode_to_string(modules->load & NETDATA_EBPF_LOAD_METHODS); - char *type_format = appconfig_get(modules->cfg, EBPF_GLOBAL_SECTION, EBPF_CFG_TYPE_FORMAT, value); - netdata_ebpf_load_mode_t load = epbf_convert_string_to_load_mode(type_format); - load = ebpf_select_load_mode(btf_file, load, kver, is_rh); - modules->load = origin | load; - - char *core_attach = appconfig_get(modules->cfg, EBPF_GLOBAL_SECTION, EBPF_CFG_CORE_ATTACH, EBPF_CFG_ATTACH_TRAMPOLINE); - netdata_ebpf_program_loaded_t fill_lm = ebpf_convert_core_type(core_attach, modules->mode); - ebpf_update_target_with_conf(modules, fill_lm); - - value = ebpf_convert_collect_pid_to_string(modules->apps_level); - char *collect_pid = appconfig_get(modules->cfg, EBPF_GLOBAL_SECTION, EBPF_CFG_COLLECT_PID, value); - modules->apps_level = ebpf_convert_string_to_apps_level(collect_pid); - - modules->maps_per_core = appconfig_get_boolean(modules->cfg, EBPF_GLOBAL_SECTION, EBPF_CFG_MAPS_PER_CORE, - modules->maps_per_core); - if (kver < NETDATA_EBPF_KERNEL_4_06) - modules->maps_per_core = CONFIG_BOOLEAN_NO; - -#ifdef NETDATA_DEV_MODE - netdata_log_info("The thread %s was configured with: mode = %s; update every = %d; apps = %s; cgroup = %s; ebpf type format = %s; ebpf co-re tracing = %s; collect pid = %s; maps per core = %s, lifetime=%u", - modules->info.thread_name, - load_mode, - modules->update_every, - (modules->apps_charts)?"enabled":"disabled", - (modules->cgroup_charts)?"enabled":"disabled", - type_format, - core_attach, - collect_pid, - (modules->maps_per_core)?"enabled":"disabled", - modules->lifetime - ); -#endif -} - -/** - * Update module - * - * When this function is called, it will load the configuration file and after this - * it updates the global information of ebpf_module. - * If the module has specific configuration, this function will load it, but it will not - * update the variables. - * - * @param em the module structure - * @param btf_file a pointer to the loaded btf file. - * @param is_rhf is Red Hat family? - * @param kver the kernel version - */ -void ebpf_update_module(ebpf_module_t *em, struct btf *btf_file, int kver, int is_rh) -{ - char filename[FILENAME_MAX+1]; - netdata_ebpf_load_mode_t origin; - - ebpf_mount_config_name(filename, FILENAME_MAX, ebpf_user_config_dir, em->config_file); - if (!ebpf_load_config(em->cfg, filename)) { - ebpf_mount_config_name(filename, FILENAME_MAX, ebpf_stock_config_dir, em->config_file); - if (!ebpf_load_config(em->cfg, filename)) { - netdata_log_error("Cannot load the ebpf configuration file %s", em->config_file); - return; - } - // If user defined data globally, we will have here EBPF_LOADED_FROM_USER, we need to consider this, to avoid - // forcing users to configure thread by thread. - origin = (!(em->load & NETDATA_EBPF_LOAD_SOURCE)) ? EBPF_LOADED_FROM_STOCK : em->load & NETDATA_EBPF_LOAD_SOURCE; - } else - origin = EBPF_LOADED_FROM_USER; - - ebpf_update_module_using_config(em, origin, btf_file, kver, is_rh); -} - -/** - * Adjust Apps Cgroup - * - * Apps and cgroup has internal cleanup that needs attaching tracers to release_task, to avoid overload the function - * we will enable this integration by default, if and only if, we are running with trampolines. - * - * @param em a pointer to the main thread structure. - * @param mode is the mode used with different - */ -void ebpf_adjust_apps_cgroup(ebpf_module_t *em, netdata_ebpf_program_loaded_t mode) -{ - if ((em->load & EBPF_LOADED_FROM_STOCK) && - (em->apps_charts || em->cgroup_charts) && - mode != EBPF_LOAD_TRAMPOLINE) { - em->apps_charts = NETDATA_EBPF_APPS_FLAG_NO; - em->cgroup_charts = 0; - } -} - -//---------------------------------------------------------------------------------------------------------------------- - -/** - * Load Address - * - * Helper used to get address from /proc/kallsym - * - * @param fa address structure - * @param fd file descriptor loaded inside kernel. If a negative value is given - * the function will load address and it won't update hash table. - */ -void ebpf_load_addresses(ebpf_addresses_t *fa, int fd) -{ - if (fa->addr) - return ; - - procfile *ff = procfile_open("/proc/kallsyms", " \t:", PROCFILE_FLAG_DEFAULT); - if (!ff) - return; - - ff = procfile_readall(ff); - if (!ff) - return; - - fa->hash = simple_hash(fa->function); - - size_t lines = procfile_lines(ff), l; - for(l = 0; l < lines ;l++) { - char *fcnt = procfile_lineword(ff, l, 2); - uint32_t hash = simple_hash(fcnt); - if (fa->hash == hash && !strcmp(fcnt, fa->function)) { - char *type = procfile_lineword(ff, l, 2); - fa->type = type[0]; - if (fd > 0) { - char addr[128]; - snprintf(addr, 127, "0x%s", procfile_lineword(ff, l, 0)); - fa->addr = (unsigned long) strtoul(addr, NULL, 16); - uint32_t key = 0; - bpf_map_update_elem(fd, &key, &fa->addr, BPF_ANY); - } else - fa->addr = 1; - break; - } - } - - procfile_close(ff); -} - -//---------------------------------------------------------------------------------------------------------------------- - -/** - * Fill Algorithms - * - * Set one unique dimension for all vector position. - * - * @param algorithms the output vector - * @param length number of elements of algorithms vector - * @param algorithm algorithm used on charts. -*/ -void ebpf_fill_algorithms(int *algorithms, size_t length, int algorithm) -{ - size_t i; - for (i = 0; i < length; i++) { - algorithms[i] = algorithm; - } -} - -/** - * Fill Histogram dimension - * - * Fill the histogram dimension with the specified ranges - */ -char **ebpf_fill_histogram_dimension(size_t maximum) -{ - char *dimensions[] = { "us", "ms", "s"}; - int previous_dim = 0, current_dim = 0; - uint32_t previous_level = 1000, current_level = 1000; - uint32_t previous_divisor = 1, current_divisor = 1; - uint32_t current = 1, previous = 0; - uint32_t selector; - char **out = callocz(maximum, sizeof(char *)); - char range[128]; - size_t end = maximum - 1; - for (selector = 0; selector < end; selector++) { - snprintf(range, 127, "%u%s->%u%s", previous/previous_divisor, dimensions[previous_dim], - current/current_divisor, dimensions[current_dim]); - out[selector] = strdupz(range); - previous = current; - current <<= 1; - - if (previous_dim != 2 && previous > previous_level) { - previous_dim++; - - previous_divisor *= 1000; - previous_level *= 1000; - } - - if (current_dim != 2 && current > current_level) { - current_dim++; - - current_divisor *= 1000; - current_level *= 1000; - } - } - snprintf(range, 127, "%u%s->+Inf", previous/previous_divisor, dimensions[previous_dim]); - out[selector] = strdupz(range); - - return out; -} - -/** - * Histogram dimension cleanup - * - * Cleanup dimensions allocated with function ebpf_fill_histogram_dimension - * - * @param ptr - * @param length - */ -void ebpf_histogram_dimension_cleanup(char **ptr, size_t length) -{ - size_t i; - for (i = 0; i < length; i++) { - freez(ptr[i]); - } - freez(ptr); -} - -//---------------------------------------------------------------------------------------------------------------------- - -/** - * Open tracepoint path - * - * @param filename pointer to store the path - * @param length file length - * @param subsys is the name of your subsystem. - * @param eventname is the name of the event to trace. - * @param flags flags used with syscall open - * - * @return it returns a positive value on success and a negative otherwise. - */ -static inline int ebpf_open_tracepoint_path(char *filename, size_t length, char *subsys, char *eventname, int flags) -{ - snprintfz(filename, length, "%s/events/%s/%s/enable", NETDATA_DEBUGFS, subsys, eventname); - return open(filename, flags, 0); -} - -/** - * Is tracepoint enabled - * - * Check whether the tracepoint is enabled. - * - * @param subsys is the name of your subsystem. - * @param eventname is the name of the event to trace. - * - * @return it returns 1 when it is enabled, 0 when it is disabled and -1 on error. - */ -int ebpf_is_tracepoint_enabled(char *subsys, char *eventname) -{ - char text[FILENAME_MAX + 1]; - int fd = ebpf_open_tracepoint_path(text, FILENAME_MAX, subsys, eventname, O_RDONLY); - if (fd < 0) { - return -1; - } - - ssize_t length = read(fd, text, 1); - if (length != 1) { - close(fd); - return -1; - } - close(fd); - - return (text[0] == '1') ? CONFIG_BOOLEAN_YES : CONFIG_BOOLEAN_NO; -} - -/** - * Change Tracing values - * - * Change value for specific tracepoint enabling or disabling it according value given. - * - * @param subsys is the name of your subsystem. - * @param eventname is the name of the event to trace. - * @param value a value to enable (1) or disable (0) a tracepoint. - * - * @return It returns 0 on success and -1 otherwise - */ -static int ebpf_change_tracing_values(char *subsys, char *eventname, char *value) -{ - if (strcmp("0", value) && strcmp("1", value)) { - netdata_log_error("Invalid value given to either enable or disable a tracepoint."); - return -1; - } - - char filename[1024]; - int fd = ebpf_open_tracepoint_path(filename, 1023, subsys, eventname, O_WRONLY); - if (fd < 0) { - return -1; - } - - ssize_t written = write(fd, value, strlen(value)); - if (written < 0) { - close(fd); - return -1; - } - - close(fd); - return 0; -} - -/** - * Enable tracing values - * - * Enable a tracepoint on a system - * - * @param subsys is the name of your subsystem. - * @param eventname is the name of the event to trace. - * - * @return It returns 0 on success and -1 otherwise - */ -int ebpf_enable_tracing_values(char *subsys, char *eventname) -{ - return ebpf_change_tracing_values(subsys, eventname, "1"); -} - -/** - * Disable tracing values - * - * Disable tracing points enabled by collector - * - * @param subsys is the name of your subsystem. - * @param eventname is the name of the event to trace. - * - * @return It returns 0 on success and -1 otherwise - */ -int ebpf_disable_tracing_values(char *subsys, char *eventname) -{ - return ebpf_change_tracing_values(subsys, eventname, "0"); -} - -/** - * Select PC prefix - * - * Identify the prefix to run on PC architecture. - * - * @return It returns 32 or 64 according to host arch. - */ -static uint32_t ebpf_select_pc_prefix() -{ - long counter = 1; - uint32_t i; - for (i = 0; i < 128; i++) { - counter <<= 1; - if (counter < 0) - break; - } - - return counter; -} - -/** - * Select Host Prefix - * - * Select prefix to syscall when host is running a kernel newer than 4.17.0 - * - * @param output the vector to store data. - * @param length length of output vector. - * @param syscall the syscall that prefix will be attached; - * @param kver the current kernel version in format MAJOR*65536 + MINOR*256 + PATCH - */ -void ebpf_select_host_prefix(char *output, size_t length, char *syscall, int kver) -{ - if (kver < NETDATA_EBPF_KERNEL_4_17) - snprintfz(output, length, "sys_%s", syscall); - else { - uint32_t arch = ebpf_select_pc_prefix(); - // Prefix selected according https://www.kernel.org/doc/html/latest/process/adding-syscalls.html - char *prefix = (arch == 32) ? "__ia32" : "__x64"; - snprintfz(output, length, "%s_sys_%s", prefix, syscall); - } -} - |