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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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 voidprint_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 voidprint_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 %02u):%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 %u bytes got %u", 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, __u32 open_flags){ 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, open_flags); } 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, open_flags); 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, open_flags); } 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, open_flags); }
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, "%u", 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 %u ", 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 %u", 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, BPF_F_RDONLY); 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){ LIBBPF_OPTS(bpf_get_fd_by_id_opts, opts); struct bpf_map_info info = {}; __u32 len = sizeof(info); __u32 id = 0; int err; int fd;
opts.open_flags = BPF_F_RDONLY;
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_opts(id, &opts); 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 intmap_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, BPF_F_RDONLY); 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, 0); 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, 0); 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, BPF_F_RDONLY); 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, BPF_F_RDONLY); 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, BPF_F_RDONLY); 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, BPF_F_RDONLY); 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, 0); 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, 0); 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 map_parse_read_only_fd(int *argc, char ***argv){ return map_parse_fd(argc, argv, BPF_F_RDONLY);}
static int do_pin(int argc, char **argv){ int err;
err = do_pin_any(argc, argv, map_parse_read_only_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(); if (strlen(map_name) > BPF_OBJ_NAME_LEN - 1) { p_info("Warning: map name is longer than %u characters, it will be truncated.", BPF_OBJ_NAME_LEN - 1); } } 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, BPF_F_RDONLY); 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, 0); 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, 0); 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 | arena |\n" " insn_array | rhash }\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);}