summaryrefslogtreecommitdiffstats
path: root/tools/bpf/bpftool/map.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /tools/bpf/bpftool/map.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/bpf/bpftool/map.c')
-rw-r--r--tools/bpf/bpftool/map.c1499
1 files changed, 1499 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c
new file mode 100644
index 0000000000..f98f7bbea2
--- /dev/null
+++ b/tools/bpf/bpftool/map.c
@@ -0,0 +1,1499 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/* Copyright (C) 2017-2018 Netronome Systems, Inc. */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <net/if.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <bpf/bpf.h>
+#include <bpf/btf.h>
+#include <bpf/hashmap.h>
+
+#include "json_writer.h"
+#include "main.h"
+
+static struct hashmap *map_table;
+
+static bool map_is_per_cpu(__u32 type)
+{
+ return type == BPF_MAP_TYPE_PERCPU_HASH ||
+ type == BPF_MAP_TYPE_PERCPU_ARRAY ||
+ type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
+ type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE;
+}
+
+static bool map_is_map_of_maps(__u32 type)
+{
+ return type == BPF_MAP_TYPE_ARRAY_OF_MAPS ||
+ type == BPF_MAP_TYPE_HASH_OF_MAPS;
+}
+
+static bool map_is_map_of_progs(__u32 type)
+{
+ return type == BPF_MAP_TYPE_PROG_ARRAY;
+}
+
+static int map_type_from_str(const char *type)
+{
+ const char *map_type_str;
+ unsigned int i;
+
+ for (i = 0; ; i++) {
+ map_type_str = libbpf_bpf_map_type_str(i);
+ if (!map_type_str)
+ break;
+
+ /* Don't allow prefixing in case of possible future shadowing */
+ if (!strcmp(map_type_str, type))
+ return i;
+ }
+ return -1;
+}
+
+static void *alloc_value(struct bpf_map_info *info)
+{
+ if (map_is_per_cpu(info->type))
+ return malloc(round_up(info->value_size, 8) *
+ get_possible_cpus());
+ else
+ return malloc(info->value_size);
+}
+
+static int do_dump_btf(const struct btf_dumper *d,
+ struct bpf_map_info *map_info, void *key,
+ void *value)
+{
+ __u32 value_id;
+ int ret = 0;
+
+ /* start of key-value pair */
+ jsonw_start_object(d->jw);
+
+ if (map_info->btf_key_type_id) {
+ jsonw_name(d->jw, "key");
+
+ ret = btf_dumper_type(d, map_info->btf_key_type_id, key);
+ if (ret)
+ goto err_end_obj;
+ }
+
+ value_id = map_info->btf_vmlinux_value_type_id ?
+ : map_info->btf_value_type_id;
+
+ if (!map_is_per_cpu(map_info->type)) {
+ jsonw_name(d->jw, "value");
+ ret = btf_dumper_type(d, value_id, value);
+ } else {
+ unsigned int i, n, step;
+
+ jsonw_name(d->jw, "values");
+ jsonw_start_array(d->jw);
+ n = get_possible_cpus();
+ step = round_up(map_info->value_size, 8);
+ for (i = 0; i < n; i++) {
+ jsonw_start_object(d->jw);
+ jsonw_int_field(d->jw, "cpu", i);
+ jsonw_name(d->jw, "value");
+ ret = btf_dumper_type(d, value_id, value + i * step);
+ jsonw_end_object(d->jw);
+ if (ret)
+ break;
+ }
+ jsonw_end_array(d->jw);
+ }
+
+err_end_obj:
+ /* end of key-value pair */
+ jsonw_end_object(d->jw);
+
+ return ret;
+}
+
+static json_writer_t *get_btf_writer(void)
+{
+ json_writer_t *jw = jsonw_new(stdout);
+
+ if (!jw)
+ return NULL;
+ jsonw_pretty(jw, true);
+
+ return jw;
+}
+
+static void print_entry_json(struct bpf_map_info *info, unsigned char *key,
+ unsigned char *value, struct btf *btf)
+{
+ jsonw_start_object(json_wtr);
+
+ if (!map_is_per_cpu(info->type)) {
+ jsonw_name(json_wtr, "key");
+ print_hex_data_json(key, info->key_size);
+ jsonw_name(json_wtr, "value");
+ print_hex_data_json(value, info->value_size);
+ if (map_is_map_of_maps(info->type))
+ jsonw_uint_field(json_wtr, "inner_map_id",
+ *(unsigned int *)value);
+ if (btf) {
+ struct btf_dumper d = {
+ .btf = btf,
+ .jw = json_wtr,
+ .is_plain_text = false,
+ };
+
+ jsonw_name(json_wtr, "formatted");
+ do_dump_btf(&d, info, key, value);
+ }
+ } else {
+ unsigned int i, n, step;
+
+ n = get_possible_cpus();
+ step = round_up(info->value_size, 8);
+
+ jsonw_name(json_wtr, "key");
+ print_hex_data_json(key, info->key_size);
+
+ jsonw_name(json_wtr, "values");
+ jsonw_start_array(json_wtr);
+ for (i = 0; i < n; i++) {
+ jsonw_start_object(json_wtr);
+
+ jsonw_int_field(json_wtr, "cpu", i);
+
+ jsonw_name(json_wtr, "value");
+ print_hex_data_json(value + i * step,
+ info->value_size);
+
+ jsonw_end_object(json_wtr);
+ }
+ jsonw_end_array(json_wtr);
+ if (btf) {
+ struct btf_dumper d = {
+ .btf = btf,
+ .jw = json_wtr,
+ .is_plain_text = false,
+ };
+
+ jsonw_name(json_wtr, "formatted");
+ do_dump_btf(&d, info, key, value);
+ }
+ }
+
+ jsonw_end_object(json_wtr);
+}
+
+static void
+print_entry_error_msg(struct bpf_map_info *info, unsigned char *key,
+ const char *error_msg)
+{
+ int msg_size = strlen(error_msg);
+ bool single_line, break_names;
+
+ break_names = info->key_size > 16 || msg_size > 16;
+ single_line = info->key_size + msg_size <= 24 && !break_names;
+
+ printf("key:%c", break_names ? '\n' : ' ');
+ fprint_hex(stdout, key, info->key_size, " ");
+
+ printf(single_line ? " " : "\n");
+
+ printf("value:%c%s", break_names ? '\n' : ' ', error_msg);
+
+ printf("\n");
+}
+
+static void
+print_entry_error(struct bpf_map_info *map_info, void *key, int lookup_errno)
+{
+ /* For prog_array maps or arrays of maps, failure to lookup the value
+ * means there is no entry for that key. Do not print an error message
+ * in that case.
+ */
+ if ((map_is_map_of_maps(map_info->type) ||
+ map_is_map_of_progs(map_info->type)) && lookup_errno == ENOENT)
+ return;
+
+ if (json_output) {
+ jsonw_start_object(json_wtr); /* entry */
+ jsonw_name(json_wtr, "key");
+ print_hex_data_json(key, map_info->key_size);
+ jsonw_name(json_wtr, "value");
+ jsonw_start_object(json_wtr); /* error */
+ jsonw_string_field(json_wtr, "error", strerror(lookup_errno));
+ jsonw_end_object(json_wtr); /* error */
+ jsonw_end_object(json_wtr); /* entry */
+ } else {
+ const char *msg = NULL;
+
+ if (lookup_errno == ENOENT)
+ msg = "<no entry>";
+ else if (lookup_errno == ENOSPC &&
+ map_info->type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY)
+ msg = "<cannot read>";
+
+ print_entry_error_msg(map_info, key,
+ msg ? : strerror(lookup_errno));
+ }
+}
+
+static void print_entry_plain(struct bpf_map_info *info, unsigned char *key,
+ unsigned char *value)
+{
+ if (!map_is_per_cpu(info->type)) {
+ bool single_line, break_names;
+
+ break_names = info->key_size > 16 || info->value_size > 16;
+ single_line = info->key_size + info->value_size <= 24 &&
+ !break_names;
+
+ if (info->key_size) {
+ printf("key:%c", break_names ? '\n' : ' ');
+ fprint_hex(stdout, key, info->key_size, " ");
+
+ printf(single_line ? " " : "\n");
+ }
+
+ if (info->value_size) {
+ if (map_is_map_of_maps(info->type)) {
+ printf("inner_map_id:%c", break_names ? '\n' : ' ');
+ printf("%u ", *(unsigned int *)value);
+ } else {
+ printf("value:%c", break_names ? '\n' : ' ');
+ fprint_hex(stdout, value, info->value_size, " ");
+ }
+ }
+
+ printf("\n");
+ } else {
+ unsigned int i, n, step;
+
+ n = get_possible_cpus();
+ step = round_up(info->value_size, 8);
+
+ if (info->key_size) {
+ printf("key:\n");
+ fprint_hex(stdout, key, info->key_size, " ");
+ printf("\n");
+ }
+ if (info->value_size) {
+ for (i = 0; i < n; i++) {
+ printf("value (CPU %02d):%c",
+ i, info->value_size > 16 ? '\n' : ' ');
+ fprint_hex(stdout, value + i * step,
+ info->value_size, " ");
+ printf("\n");
+ }
+ }
+ }
+}
+
+static char **parse_bytes(char **argv, const char *name, unsigned char *val,
+ unsigned int n)
+{
+ unsigned int i = 0, base = 0;
+ char *endptr;
+
+ if (is_prefix(*argv, "hex")) {
+ base = 16;
+ argv++;
+ }
+
+ while (i < n && argv[i]) {
+ val[i] = strtoul(argv[i], &endptr, base);
+ if (*endptr) {
+ p_err("error parsing byte: %s", argv[i]);
+ return NULL;
+ }
+ i++;
+ }
+
+ if (i != n) {
+ p_err("%s expected %d bytes got %d", name, n, i);
+ return NULL;
+ }
+
+ return argv + i;
+}
+
+/* on per cpu maps we must copy the provided value on all value instances */
+static void fill_per_cpu_value(struct bpf_map_info *info, void *value)
+{
+ unsigned int i, n, step;
+
+ if (!map_is_per_cpu(info->type))
+ return;
+
+ n = get_possible_cpus();
+ step = round_up(info->value_size, 8);
+ for (i = 1; i < n; i++)
+ memcpy(value + i * step, value, info->value_size);
+}
+
+static int parse_elem(char **argv, struct bpf_map_info *info,
+ void *key, void *value, __u32 key_size, __u32 value_size,
+ __u32 *flags, __u32 **value_fd)
+{
+ if (!*argv) {
+ if (!key && !value)
+ return 0;
+ p_err("did not find %s", key ? "key" : "value");
+ return -1;
+ }
+
+ if (is_prefix(*argv, "key")) {
+ if (!key) {
+ if (key_size)
+ p_err("duplicate key");
+ else
+ p_err("unnecessary key");
+ return -1;
+ }
+
+ argv = parse_bytes(argv + 1, "key", key, key_size);
+ if (!argv)
+ return -1;
+
+ return parse_elem(argv, info, NULL, value, key_size, value_size,
+ flags, value_fd);
+ } else if (is_prefix(*argv, "value")) {
+ int fd;
+
+ if (!value) {
+ if (value_size)
+ p_err("duplicate value");
+ else
+ p_err("unnecessary value");
+ return -1;
+ }
+
+ argv++;
+
+ if (map_is_map_of_maps(info->type)) {
+ int argc = 2;
+
+ if (value_size != 4) {
+ p_err("value smaller than 4B for map in map?");
+ return -1;
+ }
+ if (!argv[0] || !argv[1]) {
+ p_err("not enough value arguments for map in map");
+ return -1;
+ }
+
+ fd = map_parse_fd(&argc, &argv);
+ if (fd < 0)
+ return -1;
+
+ *value_fd = value;
+ **value_fd = fd;
+ } else if (map_is_map_of_progs(info->type)) {
+ int argc = 2;
+
+ if (value_size != 4) {
+ p_err("value smaller than 4B for map of progs?");
+ return -1;
+ }
+ if (!argv[0] || !argv[1]) {
+ p_err("not enough value arguments for map of progs");
+ return -1;
+ }
+ if (is_prefix(*argv, "id"))
+ p_info("Warning: updating program array via MAP_ID, make sure this map is kept open\n"
+ " by some process or pinned otherwise update will be lost");
+
+ fd = prog_parse_fd(&argc, &argv);
+ if (fd < 0)
+ return -1;
+
+ *value_fd = value;
+ **value_fd = fd;
+ } else {
+ argv = parse_bytes(argv, "value", value, value_size);
+ if (!argv)
+ return -1;
+
+ fill_per_cpu_value(info, value);
+ }
+
+ return parse_elem(argv, info, key, NULL, key_size, value_size,
+ flags, NULL);
+ } else if (is_prefix(*argv, "any") || is_prefix(*argv, "noexist") ||
+ is_prefix(*argv, "exist")) {
+ if (!flags) {
+ p_err("flags specified multiple times: %s", *argv);
+ return -1;
+ }
+
+ if (is_prefix(*argv, "any"))
+ *flags = BPF_ANY;
+ else if (is_prefix(*argv, "noexist"))
+ *flags = BPF_NOEXIST;
+ else if (is_prefix(*argv, "exist"))
+ *flags = BPF_EXIST;
+
+ return parse_elem(argv + 1, info, key, value, key_size,
+ value_size, NULL, value_fd);
+ }
+
+ p_err("expected key or value, got: %s", *argv);
+ return -1;
+}
+
+static void show_map_header_json(struct bpf_map_info *info, json_writer_t *wtr)
+{
+ const char *map_type_str;
+
+ jsonw_uint_field(wtr, "id", info->id);
+ map_type_str = libbpf_bpf_map_type_str(info->type);
+ if (map_type_str)
+ jsonw_string_field(wtr, "type", map_type_str);
+ else
+ jsonw_uint_field(wtr, "type", info->type);
+
+ if (*info->name)
+ jsonw_string_field(wtr, "name", info->name);
+
+ jsonw_name(wtr, "flags");
+ jsonw_printf(wtr, "%d", info->map_flags);
+}
+
+static int show_map_close_json(int fd, struct bpf_map_info *info)
+{
+ char *memlock, *frozen_str;
+ int frozen = 0;
+
+ memlock = get_fdinfo(fd, "memlock");
+ frozen_str = get_fdinfo(fd, "frozen");
+
+ jsonw_start_object(json_wtr);
+
+ show_map_header_json(info, json_wtr);
+
+ print_dev_json(info->ifindex, info->netns_dev, info->netns_ino);
+
+ jsonw_uint_field(json_wtr, "bytes_key", info->key_size);
+ jsonw_uint_field(json_wtr, "bytes_value", info->value_size);
+ jsonw_uint_field(json_wtr, "max_entries", info->max_entries);
+
+ if (memlock)
+ jsonw_int_field(json_wtr, "bytes_memlock", atoll(memlock));
+ free(memlock);
+
+ if (info->type == BPF_MAP_TYPE_PROG_ARRAY) {
+ char *owner_prog_type = get_fdinfo(fd, "owner_prog_type");
+ char *owner_jited = get_fdinfo(fd, "owner_jited");
+
+ if (owner_prog_type) {
+ unsigned int prog_type = atoi(owner_prog_type);
+ const char *prog_type_str;
+
+ prog_type_str = libbpf_bpf_prog_type_str(prog_type);
+ if (prog_type_str)
+ jsonw_string_field(json_wtr, "owner_prog_type",
+ prog_type_str);
+ else
+ jsonw_uint_field(json_wtr, "owner_prog_type",
+ prog_type);
+ }
+ if (owner_jited)
+ jsonw_bool_field(json_wtr, "owner_jited",
+ !!atoi(owner_jited));
+
+ free(owner_prog_type);
+ free(owner_jited);
+ }
+ close(fd);
+
+ if (frozen_str) {
+ frozen = atoi(frozen_str);
+ free(frozen_str);
+ }
+ jsonw_int_field(json_wtr, "frozen", frozen);
+
+ if (info->btf_id)
+ jsonw_int_field(json_wtr, "btf_id", info->btf_id);
+
+ if (!hashmap__empty(map_table)) {
+ struct hashmap_entry *entry;
+
+ jsonw_name(json_wtr, "pinned");
+ jsonw_start_array(json_wtr);
+ hashmap__for_each_key_entry(map_table, entry, info->id)
+ jsonw_string(json_wtr, entry->pvalue);
+ jsonw_end_array(json_wtr);
+ }
+
+ emit_obj_refs_json(refs_table, info->id, json_wtr);
+
+ jsonw_end_object(json_wtr);
+
+ return 0;
+}
+
+static void show_map_header_plain(struct bpf_map_info *info)
+{
+ const char *map_type_str;
+
+ printf("%u: ", info->id);
+
+ map_type_str = libbpf_bpf_map_type_str(info->type);
+ if (map_type_str)
+ printf("%s ", map_type_str);
+ else
+ printf("type %u ", info->type);
+
+ if (*info->name)
+ printf("name %s ", info->name);
+
+ printf("flags 0x%x", info->map_flags);
+ print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino);
+ printf("\n");
+}
+
+static int show_map_close_plain(int fd, struct bpf_map_info *info)
+{
+ char *memlock, *frozen_str;
+ int frozen = 0;
+
+ memlock = get_fdinfo(fd, "memlock");
+ frozen_str = get_fdinfo(fd, "frozen");
+
+ show_map_header_plain(info);
+ printf("\tkey %uB value %uB max_entries %u",
+ info->key_size, info->value_size, info->max_entries);
+
+ if (memlock)
+ printf(" memlock %sB", memlock);
+ free(memlock);
+
+ if (info->type == BPF_MAP_TYPE_PROG_ARRAY) {
+ char *owner_prog_type = get_fdinfo(fd, "owner_prog_type");
+ char *owner_jited = get_fdinfo(fd, "owner_jited");
+
+ if (owner_prog_type || owner_jited)
+ printf("\n\t");
+ if (owner_prog_type) {
+ unsigned int prog_type = atoi(owner_prog_type);
+ const char *prog_type_str;
+
+ prog_type_str = libbpf_bpf_prog_type_str(prog_type);
+ if (prog_type_str)
+ printf("owner_prog_type %s ", prog_type_str);
+ else
+ printf("owner_prog_type %d ", prog_type);
+ }
+ if (owner_jited)
+ printf("owner%s jited",
+ atoi(owner_jited) ? "" : " not");
+
+ free(owner_prog_type);
+ free(owner_jited);
+ }
+ close(fd);
+
+ if (!hashmap__empty(map_table)) {
+ struct hashmap_entry *entry;
+
+ hashmap__for_each_key_entry(map_table, entry, info->id)
+ printf("\n\tpinned %s", (char *)entry->pvalue);
+ }
+
+ if (frozen_str) {
+ frozen = atoi(frozen_str);
+ free(frozen_str);
+ }
+
+ if (info->btf_id || frozen)
+ printf("\n\t");
+
+ if (info->btf_id)
+ printf("btf_id %d", info->btf_id);
+
+ if (frozen)
+ printf("%sfrozen", info->btf_id ? " " : "");
+
+ emit_obj_refs_plain(refs_table, info->id, "\n\tpids ");
+
+ printf("\n");
+ return 0;
+}
+
+static int do_show_subset(int argc, char **argv)
+{
+ struct bpf_map_info info = {};
+ __u32 len = sizeof(info);
+ int *fds = NULL;
+ int nb_fds, i;
+ int err = -1;
+
+ fds = malloc(sizeof(int));
+ if (!fds) {
+ p_err("mem alloc failed");
+ return -1;
+ }
+ nb_fds = map_parse_fds(&argc, &argv, &fds);
+ if (nb_fds < 1)
+ goto exit_free;
+
+ if (json_output && nb_fds > 1)
+ jsonw_start_array(json_wtr); /* root array */
+ for (i = 0; i < nb_fds; i++) {
+ err = bpf_map_get_info_by_fd(fds[i], &info, &len);
+ if (err) {
+ p_err("can't get map info: %s",
+ strerror(errno));
+ for (; i < nb_fds; i++)
+ close(fds[i]);
+ break;
+ }
+
+ if (json_output)
+ show_map_close_json(fds[i], &info);
+ else
+ show_map_close_plain(fds[i], &info);
+
+ close(fds[i]);
+ }
+ if (json_output && nb_fds > 1)
+ jsonw_end_array(json_wtr); /* root array */
+
+exit_free:
+ free(fds);
+ return err;
+}
+
+static int do_show(int argc, char **argv)
+{
+ struct bpf_map_info info = {};
+ __u32 len = sizeof(info);
+ __u32 id = 0;
+ int err;
+ int fd;
+
+ if (show_pinned) {
+ map_table = hashmap__new(hash_fn_for_key_as_id,
+ equal_fn_for_key_as_id, NULL);
+ if (IS_ERR(map_table)) {
+ p_err("failed to create hashmap for pinned paths");
+ return -1;
+ }
+ build_pinned_obj_table(map_table, BPF_OBJ_MAP);
+ }
+ build_obj_refs_table(&refs_table, BPF_OBJ_MAP);
+
+ if (argc == 2)
+ return do_show_subset(argc, argv);
+
+ if (argc)
+ return BAD_ARG();
+
+ if (json_output)
+ jsonw_start_array(json_wtr);
+ while (true) {
+ err = bpf_map_get_next_id(id, &id);
+ if (err) {
+ if (errno == ENOENT)
+ break;
+ p_err("can't get next map: %s%s", strerror(errno),
+ errno == EINVAL ? " -- kernel too old?" : "");
+ break;
+ }
+
+ fd = bpf_map_get_fd_by_id(id);
+ if (fd < 0) {
+ if (errno == ENOENT)
+ continue;
+ p_err("can't get map by id (%u): %s",
+ id, strerror(errno));
+ break;
+ }
+
+ err = bpf_map_get_info_by_fd(fd, &info, &len);
+ if (err) {
+ p_err("can't get map info: %s", strerror(errno));
+ close(fd);
+ break;
+ }
+
+ if (json_output)
+ show_map_close_json(fd, &info);
+ else
+ show_map_close_plain(fd, &info);
+ }
+ if (json_output)
+ jsonw_end_array(json_wtr);
+
+ delete_obj_refs_table(refs_table);
+
+ if (show_pinned)
+ delete_pinned_obj_table(map_table);
+
+ return errno == ENOENT ? 0 : -1;
+}
+
+static int dump_map_elem(int fd, void *key, void *value,
+ struct bpf_map_info *map_info, struct btf *btf,
+ json_writer_t *btf_wtr)
+{
+ if (bpf_map_lookup_elem(fd, key, value)) {
+ print_entry_error(map_info, key, errno);
+ return -1;
+ }
+
+ if (json_output) {
+ print_entry_json(map_info, key, value, btf);
+ } else if (btf) {
+ struct btf_dumper d = {
+ .btf = btf,
+ .jw = btf_wtr,
+ .is_plain_text = true,
+ };
+
+ do_dump_btf(&d, map_info, key, value);
+ } else {
+ print_entry_plain(map_info, key, value);
+ }
+
+ return 0;
+}
+
+static int maps_have_btf(int *fds, int nb_fds)
+{
+ struct bpf_map_info info = {};
+ __u32 len = sizeof(info);
+ int err, i;
+
+ for (i = 0; i < nb_fds; i++) {
+ err = bpf_map_get_info_by_fd(fds[i], &info, &len);
+ if (err) {
+ p_err("can't get map info: %s", strerror(errno));
+ return -1;
+ }
+
+ if (!info.btf_id)
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct btf *btf_vmlinux;
+
+static int get_map_kv_btf(const struct bpf_map_info *info, struct btf **btf)
+{
+ int err = 0;
+
+ if (info->btf_vmlinux_value_type_id) {
+ if (!btf_vmlinux) {
+ btf_vmlinux = libbpf_find_kernel_btf();
+ if (!btf_vmlinux) {
+ p_err("failed to get kernel btf");
+ return -errno;
+ }
+ }
+ *btf = btf_vmlinux;
+ } else if (info->btf_value_type_id) {
+ *btf = btf__load_from_kernel_by_id(info->btf_id);
+ if (!*btf) {
+ err = -errno;
+ p_err("failed to get btf");
+ }
+ } else {
+ *btf = NULL;
+ }
+
+ return err;
+}
+
+static void free_map_kv_btf(struct btf *btf)
+{
+ if (btf != btf_vmlinux)
+ btf__free(btf);
+}
+
+static int
+map_dump(int fd, struct bpf_map_info *info, json_writer_t *wtr,
+ bool show_header)
+{
+ void *key, *value, *prev_key;
+ unsigned int num_elems = 0;
+ struct btf *btf = NULL;
+ int err;
+
+ key = malloc(info->key_size);
+ value = alloc_value(info);
+ if (!key || !value) {
+ p_err("mem alloc failed");
+ err = -1;
+ goto exit_free;
+ }
+
+ prev_key = NULL;
+
+ if (wtr) {
+ err = get_map_kv_btf(info, &btf);
+ if (err) {
+ goto exit_free;
+ }
+
+ if (show_header) {
+ jsonw_start_object(wtr); /* map object */
+ show_map_header_json(info, wtr);
+ jsonw_name(wtr, "elements");
+ }
+ jsonw_start_array(wtr); /* elements */
+ } else if (show_header) {
+ show_map_header_plain(info);
+ }
+
+ if (info->type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY &&
+ info->value_size != 8) {
+ const char *map_type_str;
+
+ map_type_str = libbpf_bpf_map_type_str(info->type);
+ p_info("Warning: cannot read values from %s map with value_size != 8",
+ map_type_str);
+ }
+ while (true) {
+ err = bpf_map_get_next_key(fd, prev_key, key);
+ if (err) {
+ if (errno == ENOENT)
+ err = 0;
+ break;
+ }
+ if (!dump_map_elem(fd, key, value, info, btf, wtr))
+ num_elems++;
+ prev_key = key;
+ }
+
+ if (wtr) {
+ jsonw_end_array(wtr); /* elements */
+ if (show_header)
+ jsonw_end_object(wtr); /* map object */
+ } else {
+ printf("Found %u element%s\n", num_elems,
+ num_elems != 1 ? "s" : "");
+ }
+
+exit_free:
+ free(key);
+ free(value);
+ close(fd);
+ free_map_kv_btf(btf);
+
+ return err;
+}
+
+static int do_dump(int argc, char **argv)
+{
+ json_writer_t *wtr = NULL, *btf_wtr = NULL;
+ struct bpf_map_info info = {};
+ int nb_fds, i = 0;
+ __u32 len = sizeof(info);
+ int *fds = NULL;
+ int err = -1;
+
+ if (argc != 2)
+ usage();
+
+ fds = malloc(sizeof(int));
+ if (!fds) {
+ p_err("mem alloc failed");
+ return -1;
+ }
+ nb_fds = map_parse_fds(&argc, &argv, &fds);
+ if (nb_fds < 1)
+ goto exit_free;
+
+ if (json_output) {
+ wtr = json_wtr;
+ } else {
+ int do_plain_btf;
+
+ do_plain_btf = maps_have_btf(fds, nb_fds);
+ if (do_plain_btf < 0)
+ goto exit_close;
+
+ if (do_plain_btf) {
+ btf_wtr = get_btf_writer();
+ wtr = btf_wtr;
+ if (!btf_wtr)
+ p_info("failed to create json writer for btf. falling back to plain output");
+ }
+ }
+
+ if (wtr && nb_fds > 1)
+ jsonw_start_array(wtr); /* root array */
+ for (i = 0; i < nb_fds; i++) {
+ if (bpf_map_get_info_by_fd(fds[i], &info, &len)) {
+ p_err("can't get map info: %s", strerror(errno));
+ break;
+ }
+ err = map_dump(fds[i], &info, wtr, nb_fds > 1);
+ if (!wtr && i != nb_fds - 1)
+ printf("\n");
+
+ if (err)
+ break;
+ close(fds[i]);
+ }
+ if (wtr && nb_fds > 1)
+ jsonw_end_array(wtr); /* root array */
+
+ if (btf_wtr)
+ jsonw_destroy(&btf_wtr);
+exit_close:
+ for (; i < nb_fds; i++)
+ close(fds[i]);
+exit_free:
+ free(fds);
+ btf__free(btf_vmlinux);
+ return err;
+}
+
+static int alloc_key_value(struct bpf_map_info *info, void **key, void **value)
+{
+ *key = NULL;
+ *value = NULL;
+
+ if (info->key_size) {
+ *key = malloc(info->key_size);
+ if (!*key) {
+ p_err("key mem alloc failed");
+ return -1;
+ }
+ }
+
+ if (info->value_size) {
+ *value = alloc_value(info);
+ if (!*value) {
+ p_err("value mem alloc failed");
+ free(*key);
+ *key = NULL;
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static int do_update(int argc, char **argv)
+{
+ struct bpf_map_info info = {};
+ __u32 len = sizeof(info);
+ __u32 *value_fd = NULL;
+ __u32 flags = BPF_ANY;
+ void *key, *value;
+ int fd, err;
+
+ if (argc < 2)
+ usage();
+
+ fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
+ if (fd < 0)
+ return -1;
+
+ err = alloc_key_value(&info, &key, &value);
+ if (err)
+ goto exit_free;
+
+ err = parse_elem(argv, &info, key, value, info.key_size,
+ info.value_size, &flags, &value_fd);
+ if (err)
+ goto exit_free;
+
+ err = bpf_map_update_elem(fd, key, value, flags);
+ if (err) {
+ p_err("update failed: %s", strerror(errno));
+ goto exit_free;
+ }
+
+exit_free:
+ if (value_fd)
+ close(*value_fd);
+ free(key);
+ free(value);
+ close(fd);
+
+ if (!err && json_output)
+ jsonw_null(json_wtr);
+ return err;
+}
+
+static void print_key_value(struct bpf_map_info *info, void *key,
+ void *value)
+{
+ json_writer_t *btf_wtr;
+ struct btf *btf;
+
+ if (get_map_kv_btf(info, &btf))
+ return;
+
+ if (json_output) {
+ print_entry_json(info, key, value, btf);
+ } else if (btf) {
+ /* if here json_wtr wouldn't have been initialised,
+ * so let's create separate writer for btf
+ */
+ btf_wtr = get_btf_writer();
+ if (!btf_wtr) {
+ p_info("failed to create json writer for btf. falling back to plain output");
+ btf__free(btf);
+ btf = NULL;
+ print_entry_plain(info, key, value);
+ } else {
+ struct btf_dumper d = {
+ .btf = btf,
+ .jw = btf_wtr,
+ .is_plain_text = true,
+ };
+
+ do_dump_btf(&d, info, key, value);
+ jsonw_destroy(&btf_wtr);
+ }
+ } else {
+ print_entry_plain(info, key, value);
+ }
+ btf__free(btf);
+}
+
+static int do_lookup(int argc, char **argv)
+{
+ struct bpf_map_info info = {};
+ __u32 len = sizeof(info);
+ void *key, *value;
+ int err;
+ int fd;
+
+ if (argc < 2)
+ usage();
+
+ fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
+ if (fd < 0)
+ return -1;
+
+ err = alloc_key_value(&info, &key, &value);
+ if (err)
+ goto exit_free;
+
+ err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL);
+ if (err)
+ goto exit_free;
+
+ err = bpf_map_lookup_elem(fd, key, value);
+ if (err) {
+ if (errno == ENOENT) {
+ if (json_output) {
+ jsonw_null(json_wtr);
+ } else {
+ printf("key:\n");
+ fprint_hex(stdout, key, info.key_size, " ");
+ printf("\n\nNot found\n");
+ }
+ } else {
+ p_err("lookup failed: %s", strerror(errno));
+ }
+
+ goto exit_free;
+ }
+
+ /* here means bpf_map_lookup_elem() succeeded */
+ print_key_value(&info, key, value);
+
+exit_free:
+ free(key);
+ free(value);
+ close(fd);
+
+ return err;
+}
+
+static int do_getnext(int argc, char **argv)
+{
+ struct bpf_map_info info = {};
+ __u32 len = sizeof(info);
+ void *key, *nextkey;
+ int err;
+ int fd;
+
+ if (argc < 2)
+ usage();
+
+ fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
+ if (fd < 0)
+ return -1;
+
+ key = malloc(info.key_size);
+ nextkey = malloc(info.key_size);
+ if (!key || !nextkey) {
+ p_err("mem alloc failed");
+ err = -1;
+ goto exit_free;
+ }
+
+ if (argc) {
+ err = parse_elem(argv, &info, key, NULL, info.key_size, 0,
+ NULL, NULL);
+ if (err)
+ goto exit_free;
+ } else {
+ free(key);
+ key = NULL;
+ }
+
+ err = bpf_map_get_next_key(fd, key, nextkey);
+ if (err) {
+ p_err("can't get next key: %s", strerror(errno));
+ goto exit_free;
+ }
+
+ if (json_output) {
+ jsonw_start_object(json_wtr);
+ if (key) {
+ jsonw_name(json_wtr, "key");
+ print_hex_data_json(key, info.key_size);
+ } else {
+ jsonw_null_field(json_wtr, "key");
+ }
+ jsonw_name(json_wtr, "next_key");
+ print_hex_data_json(nextkey, info.key_size);
+ jsonw_end_object(json_wtr);
+ } else {
+ if (key) {
+ printf("key:\n");
+ fprint_hex(stdout, key, info.key_size, " ");
+ printf("\n");
+ } else {
+ printf("key: None\n");
+ }
+ printf("next key:\n");
+ fprint_hex(stdout, nextkey, info.key_size, " ");
+ printf("\n");
+ }
+
+exit_free:
+ free(nextkey);
+ free(key);
+ close(fd);
+
+ return err;
+}
+
+static int do_delete(int argc, char **argv)
+{
+ struct bpf_map_info info = {};
+ __u32 len = sizeof(info);
+ void *key;
+ int err;
+ int fd;
+
+ if (argc < 2)
+ usage();
+
+ fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
+ if (fd < 0)
+ return -1;
+
+ key = malloc(info.key_size);
+ if (!key) {
+ p_err("mem alloc failed");
+ err = -1;
+ goto exit_free;
+ }
+
+ err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL);
+ if (err)
+ goto exit_free;
+
+ err = bpf_map_delete_elem(fd, key);
+ if (err)
+ p_err("delete failed: %s", strerror(errno));
+
+exit_free:
+ free(key);
+ close(fd);
+
+ if (!err && json_output)
+ jsonw_null(json_wtr);
+ return err;
+}
+
+static int do_pin(int argc, char **argv)
+{
+ int err;
+
+ err = do_pin_any(argc, argv, map_parse_fd);
+ if (!err && json_output)
+ jsonw_null(json_wtr);
+ return err;
+}
+
+static int do_create(int argc, char **argv)
+{
+ LIBBPF_OPTS(bpf_map_create_opts, attr);
+ enum bpf_map_type map_type = BPF_MAP_TYPE_UNSPEC;
+ __u32 key_size = 0, value_size = 0, max_entries = 0;
+ const char *map_name = NULL;
+ const char *pinfile;
+ int err = -1, fd;
+
+ if (!REQ_ARGS(7))
+ return -1;
+ pinfile = GET_ARG();
+
+ while (argc) {
+ if (!REQ_ARGS(2))
+ return -1;
+
+ if (is_prefix(*argv, "type")) {
+ NEXT_ARG();
+
+ if (map_type) {
+ p_err("map type already specified");
+ goto exit;
+ }
+
+ map_type = map_type_from_str(*argv);
+ if ((int)map_type < 0) {
+ p_err("unrecognized map type: %s", *argv);
+ goto exit;
+ }
+ NEXT_ARG();
+ } else if (is_prefix(*argv, "name")) {
+ NEXT_ARG();
+ map_name = GET_ARG();
+ } else if (is_prefix(*argv, "key")) {
+ if (parse_u32_arg(&argc, &argv, &key_size,
+ "key size"))
+ goto exit;
+ } else if (is_prefix(*argv, "value")) {
+ if (parse_u32_arg(&argc, &argv, &value_size,
+ "value size"))
+ goto exit;
+ } else if (is_prefix(*argv, "entries")) {
+ if (parse_u32_arg(&argc, &argv, &max_entries,
+ "max entries"))
+ goto exit;
+ } else if (is_prefix(*argv, "flags")) {
+ if (parse_u32_arg(&argc, &argv, &attr.map_flags,
+ "flags"))
+ goto exit;
+ } else if (is_prefix(*argv, "dev")) {
+ p_info("Warning: 'bpftool map create [...] dev <ifname>' syntax is deprecated.\n"
+ "Going further, please use 'offload_dev <ifname>' to request hardware offload for the map.");
+ goto offload_dev;
+ } else if (is_prefix(*argv, "offload_dev")) {
+offload_dev:
+ NEXT_ARG();
+
+ if (attr.map_ifindex) {
+ p_err("offload device already specified");
+ goto exit;
+ }
+
+ attr.map_ifindex = if_nametoindex(*argv);
+ if (!attr.map_ifindex) {
+ p_err("unrecognized netdevice '%s': %s",
+ *argv, strerror(errno));
+ goto exit;
+ }
+ NEXT_ARG();
+ } else if (is_prefix(*argv, "inner_map")) {
+ struct bpf_map_info info = {};
+ __u32 len = sizeof(info);
+ int inner_map_fd;
+
+ NEXT_ARG();
+ if (!REQ_ARGS(2))
+ usage();
+ inner_map_fd = map_parse_fd_and_info(&argc, &argv,
+ &info, &len);
+ if (inner_map_fd < 0)
+ return -1;
+ attr.inner_map_fd = inner_map_fd;
+ } else {
+ p_err("unknown arg %s", *argv);
+ goto exit;
+ }
+ }
+
+ if (!map_name) {
+ p_err("map name not specified");
+ goto exit;
+ }
+
+ set_max_rlimit();
+
+ fd = bpf_map_create(map_type, map_name, key_size, value_size, max_entries, &attr);
+ if (fd < 0) {
+ p_err("map create failed: %s", strerror(errno));
+ goto exit;
+ }
+
+ err = do_pin_fd(fd, pinfile);
+ close(fd);
+ if (err)
+ goto exit;
+
+ if (json_output)
+ jsonw_null(json_wtr);
+
+exit:
+ if (attr.inner_map_fd > 0)
+ close(attr.inner_map_fd);
+
+ return err;
+}
+
+static int do_pop_dequeue(int argc, char **argv)
+{
+ struct bpf_map_info info = {};
+ __u32 len = sizeof(info);
+ void *key, *value;
+ int err;
+ int fd;
+
+ if (argc < 2)
+ usage();
+
+ fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
+ if (fd < 0)
+ return -1;
+
+ err = alloc_key_value(&info, &key, &value);
+ if (err)
+ goto exit_free;
+
+ err = bpf_map_lookup_and_delete_elem(fd, key, value);
+ if (err) {
+ if (errno == ENOENT) {
+ if (json_output)
+ jsonw_null(json_wtr);
+ else
+ printf("Error: empty map\n");
+ } else {
+ p_err("pop failed: %s", strerror(errno));
+ }
+
+ goto exit_free;
+ }
+
+ print_key_value(&info, key, value);
+
+exit_free:
+ free(key);
+ free(value);
+ close(fd);
+
+ return err;
+}
+
+static int do_freeze(int argc, char **argv)
+{
+ int err, fd;
+
+ if (!REQ_ARGS(2))
+ return -1;
+
+ fd = map_parse_fd(&argc, &argv);
+ if (fd < 0)
+ return -1;
+
+ if (argc) {
+ close(fd);
+ return BAD_ARG();
+ }
+
+ err = bpf_map_freeze(fd);
+ close(fd);
+ if (err) {
+ p_err("failed to freeze map: %s", strerror(errno));
+ return err;
+ }
+
+ if (json_output)
+ jsonw_null(json_wtr);
+
+ return 0;
+}
+
+static int do_help(int argc, char **argv)
+{
+ if (json_output) {
+ jsonw_null(json_wtr);
+ return 0;
+ }
+
+ fprintf(stderr,
+ "Usage: %1$s %2$s { show | list } [MAP]\n"
+ " %1$s %2$s create FILE type TYPE key KEY_SIZE value VALUE_SIZE \\\n"
+ " entries MAX_ENTRIES name NAME [flags FLAGS] \\\n"
+ " [inner_map MAP] [offload_dev NAME]\n"
+ " %1$s %2$s dump MAP\n"
+ " %1$s %2$s update MAP [key DATA] [value VALUE] [UPDATE_FLAGS]\n"
+ " %1$s %2$s lookup MAP [key DATA]\n"
+ " %1$s %2$s getnext MAP [key DATA]\n"
+ " %1$s %2$s delete MAP key DATA\n"
+ " %1$s %2$s pin MAP FILE\n"
+ " %1$s %2$s event_pipe MAP [cpu N index M]\n"
+ " %1$s %2$s peek MAP\n"
+ " %1$s %2$s push MAP value VALUE\n"
+ " %1$s %2$s pop MAP\n"
+ " %1$s %2$s enqueue MAP value VALUE\n"
+ " %1$s %2$s dequeue MAP\n"
+ " %1$s %2$s freeze MAP\n"
+ " %1$s %2$s help\n"
+ "\n"
+ " " HELP_SPEC_MAP "\n"
+ " DATA := { [hex] BYTES }\n"
+ " " HELP_SPEC_PROGRAM "\n"
+ " VALUE := { DATA | MAP | PROG }\n"
+ " UPDATE_FLAGS := { any | exist | noexist }\n"
+ " TYPE := { hash | array | prog_array | perf_event_array | percpu_hash |\n"
+ " percpu_array | stack_trace | cgroup_array | lru_hash |\n"
+ " lru_percpu_hash | lpm_trie | array_of_maps | hash_of_maps |\n"
+ " devmap | devmap_hash | sockmap | cpumap | xskmap | sockhash |\n"
+ " cgroup_storage | reuseport_sockarray | percpu_cgroup_storage |\n"
+ " queue | stack | sk_storage | struct_ops | ringbuf | inode_storage |\n"
+ " task_storage | bloom_filter | user_ringbuf | cgrp_storage }\n"
+ " " HELP_SPEC_OPTIONS " |\n"
+ " {-f|--bpffs} | {-n|--nomount} }\n"
+ "",
+ bin_name, argv[-2]);
+
+ return 0;
+}
+
+static const struct cmd cmds[] = {
+ { "show", do_show },
+ { "list", do_show },
+ { "help", do_help },
+ { "dump", do_dump },
+ { "update", do_update },
+ { "lookup", do_lookup },
+ { "getnext", do_getnext },
+ { "delete", do_delete },
+ { "pin", do_pin },
+ { "event_pipe", do_event_pipe },
+ { "create", do_create },
+ { "peek", do_lookup },
+ { "push", do_update },
+ { "enqueue", do_update },
+ { "pop", do_pop_dequeue },
+ { "dequeue", do_pop_dequeue },
+ { "freeze", do_freeze },
+ { 0 }
+};
+
+int do_map(int argc, char **argv)
+{
+ return cmd_select(cmds, argc, argv, do_help);
+}