linux/tools/bpf/bpftool/map.c

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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2017-2018 Netronome Systems, Inc. */
#include <assert.h>
#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 "json_writer.h"
#include "main.h"
const char * const map_type_name[] = {
[BPF_MAP_TYPE_UNSPEC] = "unspec",
[BPF_MAP_TYPE_HASH] = "hash",
[BPF_MAP_TYPE_ARRAY] = "array",
[BPF_MAP_TYPE_PROG_ARRAY] = "prog_array",
[BPF_MAP_TYPE_PERF_EVENT_ARRAY] = "perf_event_array",
[BPF_MAP_TYPE_PERCPU_HASH] = "percpu_hash",
[BPF_MAP_TYPE_PERCPU_ARRAY] = "percpu_array",
[BPF_MAP_TYPE_STACK_TRACE] = "stack_trace",
[BPF_MAP_TYPE_CGROUP_ARRAY] = "cgroup_array",
[BPF_MAP_TYPE_LRU_HASH] = "lru_hash",
[BPF_MAP_TYPE_LRU_PERCPU_HASH] = "lru_percpu_hash",
[BPF_MAP_TYPE_LPM_TRIE] = "lpm_trie",
[BPF_MAP_TYPE_ARRAY_OF_MAPS] = "array_of_maps",
[BPF_MAP_TYPE_HASH_OF_MAPS] = "hash_of_maps",
[BPF_MAP_TYPE_DEVMAP] = "devmap",
[BPF_MAP_TYPE_DEVMAP_HASH] = "devmap_hash",
[BPF_MAP_TYPE_SOCKMAP] = "sockmap",
[BPF_MAP_TYPE_CPUMAP] = "cpumap",
[BPF_MAP_TYPE_XSKMAP] = "xskmap",
[BPF_MAP_TYPE_SOCKHASH] = "sockhash",
[BPF_MAP_TYPE_CGROUP_STORAGE] = "cgroup_storage",
[BPF_MAP_TYPE_REUSEPORT_SOCKARRAY] = "reuseport_sockarray",
[BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE] = "percpu_cgroup_storage",
[BPF_MAP_TYPE_QUEUE] = "queue",
[BPF_MAP_TYPE_STACK] = "stack",
[BPF_MAP_TYPE_SK_STORAGE] = "sk_storage",
[BPF_MAP_TYPE_STRUCT_OPS] = "struct_ops",
};
const size_t map_type_name_size = ARRAY_SIZE(map_type_name);
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)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(map_type_name); i++)
/* Don't allow prefixing in case of possible future shadowing */
if (map_type_name[i] && !strcmp(map_type_name[i], 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;
/* 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 (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(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_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) {
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)
{
tools: bpftool: make it easier to feed hex bytes to bpftool bpftool uses hexadecimal values when it dumps map contents: # bpftool map dump id 1337 key: ff 13 37 ff value: a1 b2 c3 d4 ff ff ff ff Found 1 element In order to lookup or update values with bpftool, the natural reflex is then to copy and paste the values to the command line, and to try to run something like: # bpftool map update id 1337 key ff 13 37 ff \ value 00 00 00 00 00 00 1a 2b Error: error parsing byte: ff bpftool complains, because it uses strtoul() with a 0 base to parse the bytes, and that without a "0x" prefix, the bytes are considered as decimal values (or even octal if they start with "0"). To feed hexadecimal values instead, one needs to add "0x" prefixes everywhere necessary: # bpftool map update id 1337 key 0xff 0x13 0x37 0xff \ value 0 0 0 0 0 0 0x1a 0x2b To make it easier to use hexadecimal values, add an optional "hex" keyword to put after "key" or "value" to tell bpftool to consider the digits as hexadecimal. We can now do: # bpftool map update id 1337 key hex ff 13 37 ff \ value hex 0 0 0 0 0 0 1a 2b Without the "hex" keyword, the bytes are still parsed according to normal integer notation (decimal if no prefix, or hexadecimal or octal if "0x" or "0" prefix is used, respectively). The patch also add related documentation and bash completion for the "hex" keyword. Suggested-by: Daniel Borkmann <daniel@iogearbox.net> Suggested-by: David Beckett <david.beckett@netronome.com> Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com> Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-04-18 10:46:34 +08:00
unsigned int i = 0, base = 0;
char *endptr;
tools: bpftool: make it easier to feed hex bytes to bpftool bpftool uses hexadecimal values when it dumps map contents: # bpftool map dump id 1337 key: ff 13 37 ff value: a1 b2 c3 d4 ff ff ff ff Found 1 element In order to lookup or update values with bpftool, the natural reflex is then to copy and paste the values to the command line, and to try to run something like: # bpftool map update id 1337 key ff 13 37 ff \ value 00 00 00 00 00 00 1a 2b Error: error parsing byte: ff bpftool complains, because it uses strtoul() with a 0 base to parse the bytes, and that without a "0x" prefix, the bytes are considered as decimal values (or even octal if they start with "0"). To feed hexadecimal values instead, one needs to add "0x" prefixes everywhere necessary: # bpftool map update id 1337 key 0xff 0x13 0x37 0xff \ value 0 0 0 0 0 0 0x1a 0x2b To make it easier to use hexadecimal values, add an optional "hex" keyword to put after "key" or "value" to tell bpftool to consider the digits as hexadecimal. We can now do: # bpftool map update id 1337 key hex ff 13 37 ff \ value hex 0 0 0 0 0 0 1a 2b Without the "hex" keyword, the bytes are still parsed according to normal integer notation (decimal if no prefix, or hexadecimal or octal if "0x" or "0" prefix is used, respectively). The patch also add related documentation and bash completion for the "hex" keyword. Suggested-by: Daniel Borkmann <daniel@iogearbox.net> Suggested-by: David Beckett <david.beckett@netronome.com> Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com> Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-04-18 10:46:34 +08:00
if (is_prefix(*argv, "hex")) {
base = 16;
argv++;
}
while (i < n && argv[i]) {
tools: bpftool: make it easier to feed hex bytes to bpftool bpftool uses hexadecimal values when it dumps map contents: # bpftool map dump id 1337 key: ff 13 37 ff value: a1 b2 c3 d4 ff ff ff ff Found 1 element In order to lookup or update values with bpftool, the natural reflex is then to copy and paste the values to the command line, and to try to run something like: # bpftool map update id 1337 key ff 13 37 ff \ value 00 00 00 00 00 00 1a 2b Error: error parsing byte: ff bpftool complains, because it uses strtoul() with a 0 base to parse the bytes, and that without a "0x" prefix, the bytes are considered as decimal values (or even octal if they start with "0"). To feed hexadecimal values instead, one needs to add "0x" prefixes everywhere necessary: # bpftool map update id 1337 key 0xff 0x13 0x37 0xff \ value 0 0 0 0 0 0 0x1a 0x2b To make it easier to use hexadecimal values, add an optional "hex" keyword to put after "key" or "value" to tell bpftool to consider the digits as hexadecimal. We can now do: # bpftool map update id 1337 key hex ff 13 37 ff \ value hex 0 0 0 0 0 0 1a 2b Without the "hex" keyword, the bytes are still parsed according to normal integer notation (decimal if no prefix, or hexadecimal or octal if "0x" or "0" prefix is used, respectively). The patch also add related documentation and bash completion for the "hex" keyword. Suggested-by: Daniel Borkmann <daniel@iogearbox.net> Suggested-by: David Beckett <david.beckett@netronome.com> Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com> Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-04-18 10:46:34 +08:00
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)
{
jsonw_uint_field(wtr, "id", info->id);
if (info->type < ARRAY_SIZE(map_type_name))
jsonw_string_field(wtr, "type", map_type_name[info->type]);
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", atoi(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);
if (prog_type < ARRAY_SIZE(prog_type_name))
jsonw_string_field(json_wtr, "owner_prog_type",
prog_type_name[prog_type]);
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);
tools: bpftool: show filenames of pinned objects Added support to show filenames of pinned objects. For example: root@test# ./bpftool prog 3: tracepoint name tracepoint__irq tag f677a7dd722299a3 loaded_at Oct 26/11:39 uid 0 xlated 160B not jited memlock 4096B map_ids 4 pinned /sys/fs/bpf/softirq_prog 4: tracepoint name tracepoint__irq tag ea5dc530d00b92b6 loaded_at Oct 26/11:39 uid 0 xlated 392B not jited memlock 4096B map_ids 4,6 root@test# ./bpftool --json --pretty prog [{ "id": 3, "type": "tracepoint", "name": "tracepoint__irq", "tag": "f677a7dd722299a3", "loaded_at": "Oct 26/11:39", "uid": 0, "bytes_xlated": 160, "jited": false, "bytes_memlock": 4096, "map_ids": [4 ], "pinned": ["/sys/fs/bpf/softirq_prog" ] },{ "id": 4, "type": "tracepoint", "name": "tracepoint__irq", "tag": "ea5dc530d00b92b6", "loaded_at": "Oct 26/11:39", "uid": 0, "bytes_xlated": 392, "jited": false, "bytes_memlock": 4096, "map_ids": [4,6 ], "pinned": [] } ] root@test# ./bpftool map 4: hash name start flags 0x0 key 4B value 16B max_entries 10240 memlock 1003520B pinned /sys/fs/bpf/softirq_map1 5: hash name iptr flags 0x0 key 4B value 8B max_entries 10240 memlock 921600B root@test# ./bpftool --json --pretty map [{ "id": 4, "type": "hash", "name": "start", "flags": 0, "bytes_key": 4, "bytes_value": 16, "max_entries": 10240, "bytes_memlock": 1003520, "pinned": ["/sys/fs/bpf/softirq_map1" ] },{ "id": 5, "type": "hash", "name": "iptr", "flags": 0, "bytes_key": 4, "bytes_value": 8, "max_entries": 10240, "bytes_memlock": 921600, "pinned": [] } ] Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-08 12:55:48 +08:00
if (!hash_empty(map_table.table)) {
struct pinned_obj *obj;
jsonw_name(json_wtr, "pinned");
jsonw_start_array(json_wtr);
hash_for_each_possible(map_table.table, obj, hash, info->id) {
if (obj->id == info->id)
jsonw_string(json_wtr, obj->path);
}
jsonw_end_array(json_wtr);
}
jsonw_end_object(json_wtr);
return 0;
}
static void show_map_header_plain(struct bpf_map_info *info)
{
printf("%u: ", info->id);
if (info->type < ARRAY_SIZE(map_type_name))
printf("%s ", map_type_name[info->type]);
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);
if (prog_type < ARRAY_SIZE(prog_type_name))
printf("owner_prog_type %s ",
prog_type_name[prog_type]);
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);
tools: bpftool: show filenames of pinned objects Added support to show filenames of pinned objects. For example: root@test# ./bpftool prog 3: tracepoint name tracepoint__irq tag f677a7dd722299a3 loaded_at Oct 26/11:39 uid 0 xlated 160B not jited memlock 4096B map_ids 4 pinned /sys/fs/bpf/softirq_prog 4: tracepoint name tracepoint__irq tag ea5dc530d00b92b6 loaded_at Oct 26/11:39 uid 0 xlated 392B not jited memlock 4096B map_ids 4,6 root@test# ./bpftool --json --pretty prog [{ "id": 3, "type": "tracepoint", "name": "tracepoint__irq", "tag": "f677a7dd722299a3", "loaded_at": "Oct 26/11:39", "uid": 0, "bytes_xlated": 160, "jited": false, "bytes_memlock": 4096, "map_ids": [4 ], "pinned": ["/sys/fs/bpf/softirq_prog" ] },{ "id": 4, "type": "tracepoint", "name": "tracepoint__irq", "tag": "ea5dc530d00b92b6", "loaded_at": "Oct 26/11:39", "uid": 0, "bytes_xlated": 392, "jited": false, "bytes_memlock": 4096, "map_ids": [4,6 ], "pinned": [] } ] root@test# ./bpftool map 4: hash name start flags 0x0 key 4B value 16B max_entries 10240 memlock 1003520B pinned /sys/fs/bpf/softirq_map1 5: hash name iptr flags 0x0 key 4B value 8B max_entries 10240 memlock 921600B root@test# ./bpftool --json --pretty map [{ "id": 4, "type": "hash", "name": "start", "flags": 0, "bytes_key": 4, "bytes_value": 16, "max_entries": 10240, "bytes_memlock": 1003520, "pinned": ["/sys/fs/bpf/softirq_map1" ] },{ "id": 5, "type": "hash", "name": "iptr", "flags": 0, "bytes_key": 4, "bytes_value": 8, "max_entries": 10240, "bytes_memlock": 921600, "pinned": [] } ] Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-08 12:55:48 +08:00
if (!hash_empty(map_table.table)) {
struct pinned_obj *obj;
tools: bpftool: show filenames of pinned objects Added support to show filenames of pinned objects. For example: root@test# ./bpftool prog 3: tracepoint name tracepoint__irq tag f677a7dd722299a3 loaded_at Oct 26/11:39 uid 0 xlated 160B not jited memlock 4096B map_ids 4 pinned /sys/fs/bpf/softirq_prog 4: tracepoint name tracepoint__irq tag ea5dc530d00b92b6 loaded_at Oct 26/11:39 uid 0 xlated 392B not jited memlock 4096B map_ids 4,6 root@test# ./bpftool --json --pretty prog [{ "id": 3, "type": "tracepoint", "name": "tracepoint__irq", "tag": "f677a7dd722299a3", "loaded_at": "Oct 26/11:39", "uid": 0, "bytes_xlated": 160, "jited": false, "bytes_memlock": 4096, "map_ids": [4 ], "pinned": ["/sys/fs/bpf/softirq_prog" ] },{ "id": 4, "type": "tracepoint", "name": "tracepoint__irq", "tag": "ea5dc530d00b92b6", "loaded_at": "Oct 26/11:39", "uid": 0, "bytes_xlated": 392, "jited": false, "bytes_memlock": 4096, "map_ids": [4,6 ], "pinned": [] } ] root@test# ./bpftool map 4: hash name start flags 0x0 key 4B value 16B max_entries 10240 memlock 1003520B pinned /sys/fs/bpf/softirq_map1 5: hash name iptr flags 0x0 key 4B value 8B max_entries 10240 memlock 921600B root@test# ./bpftool --json --pretty map [{ "id": 4, "type": "hash", "name": "start", "flags": 0, "bytes_key": 4, "bytes_value": 16, "max_entries": 10240, "bytes_memlock": 1003520, "pinned": ["/sys/fs/bpf/softirq_map1" ] },{ "id": 5, "type": "hash", "name": "iptr", "flags": 0, "bytes_key": 4, "bytes_value": 8, "max_entries": 10240, "bytes_memlock": 921600, "pinned": [] } ] Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-08 12:55:48 +08:00
hash_for_each_possible(map_table.table, obj, hash, info->id) {
if (obj->id == info->id)
printf("\n\tpinned %s", obj->path);
tools: bpftool: show filenames of pinned objects Added support to show filenames of pinned objects. For example: root@test# ./bpftool prog 3: tracepoint name tracepoint__irq tag f677a7dd722299a3 loaded_at Oct 26/11:39 uid 0 xlated 160B not jited memlock 4096B map_ids 4 pinned /sys/fs/bpf/softirq_prog 4: tracepoint name tracepoint__irq tag ea5dc530d00b92b6 loaded_at Oct 26/11:39 uid 0 xlated 392B not jited memlock 4096B map_ids 4,6 root@test# ./bpftool --json --pretty prog [{ "id": 3, "type": "tracepoint", "name": "tracepoint__irq", "tag": "f677a7dd722299a3", "loaded_at": "Oct 26/11:39", "uid": 0, "bytes_xlated": 160, "jited": false, "bytes_memlock": 4096, "map_ids": [4 ], "pinned": ["/sys/fs/bpf/softirq_prog" ] },{ "id": 4, "type": "tracepoint", "name": "tracepoint__irq", "tag": "ea5dc530d00b92b6", "loaded_at": "Oct 26/11:39", "uid": 0, "bytes_xlated": 392, "jited": false, "bytes_memlock": 4096, "map_ids": [4,6 ], "pinned": [] } ] root@test# ./bpftool map 4: hash name start flags 0x0 key 4B value 16B max_entries 10240 memlock 1003520B pinned /sys/fs/bpf/softirq_map1 5: hash name iptr flags 0x0 key 4B value 8B max_entries 10240 memlock 921600B root@test# ./bpftool --json --pretty map [{ "id": 4, "type": "hash", "name": "start", "flags": 0, "bytes_key": 4, "bytes_value": 16, "max_entries": 10240, "bytes_memlock": 1003520, "pinned": ["/sys/fs/bpf/softirq_map1" ] },{ "id": 5, "type": "hash", "name": "iptr", "flags": 0, "bytes_key": 4, "bytes_value": 8, "max_entries": 10240, "bytes_memlock": 921600, "pinned": [] } ] Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-08 12:55:48 +08:00
}
}
printf("\n");
if (frozen_str) {
frozen = atoi(frozen_str);
free(frozen_str);
}
if (!info->btf_id && !frozen)
return 0;
printf("\t");
if (info->btf_id)
printf("btf_id %d", info->btf_id);
if (frozen)
printf("%sfrozen", info->btf_id ? " " : "");
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_obj_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)
build_pinned_obj_table(&map_table, BPF_OBJ_MAP);
tools: bpftool: show filenames of pinned objects Added support to show filenames of pinned objects. For example: root@test# ./bpftool prog 3: tracepoint name tracepoint__irq tag f677a7dd722299a3 loaded_at Oct 26/11:39 uid 0 xlated 160B not jited memlock 4096B map_ids 4 pinned /sys/fs/bpf/softirq_prog 4: tracepoint name tracepoint__irq tag ea5dc530d00b92b6 loaded_at Oct 26/11:39 uid 0 xlated 392B not jited memlock 4096B map_ids 4,6 root@test# ./bpftool --json --pretty prog [{ "id": 3, "type": "tracepoint", "name": "tracepoint__irq", "tag": "f677a7dd722299a3", "loaded_at": "Oct 26/11:39", "uid": 0, "bytes_xlated": 160, "jited": false, "bytes_memlock": 4096, "map_ids": [4 ], "pinned": ["/sys/fs/bpf/softirq_prog" ] },{ "id": 4, "type": "tracepoint", "name": "tracepoint__irq", "tag": "ea5dc530d00b92b6", "loaded_at": "Oct 26/11:39", "uid": 0, "bytes_xlated": 392, "jited": false, "bytes_memlock": 4096, "map_ids": [4,6 ], "pinned": [] } ] root@test# ./bpftool map 4: hash name start flags 0x0 key 4B value 16B max_entries 10240 memlock 1003520B pinned /sys/fs/bpf/softirq_map1 5: hash name iptr flags 0x0 key 4B value 8B max_entries 10240 memlock 921600B root@test# ./bpftool --json --pretty map [{ "id": 4, "type": "hash", "name": "start", "flags": 0, "bytes_key": 4, "bytes_value": 16, "max_entries": 10240, "bytes_memlock": 1003520, "pinned": ["/sys/fs/bpf/softirq_map1" ] },{ "id": 5, "type": "hash", "name": "iptr", "flags": 0, "bytes_key": 4, "bytes_value": 8, "max_entries": 10240, "bytes_memlock": 921600, "pinned": [] } ] Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-08 12:55:48 +08:00
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_obj_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);
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)
{
int num_elems = 0;
int lookup_errno;
if (!bpf_map_lookup_elem(fd, key, value)) {
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);
}
num_elems++;
}
return num_elems;
}
/* lookup error handling */
lookup_errno = errno;
if (map_is_map_of_maps(map_info->type) ||
map_is_map_of_progs(map_info->type))
return 0;
if (json_output) {
jsonw_start_object(json_wtr);
jsonw_name(json_wtr, "key");
print_hex_data_json(key, map_info->key_size);
jsonw_name(json_wtr, "value");
jsonw_start_object(json_wtr);
jsonw_string_field(json_wtr, "error", strerror(lookup_errno));
jsonw_end_object(json_wtr);
jsonw_end_object(json_wtr);
} 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(map_info, key,
msg ? : strerror(lookup_errno));
}
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_obj_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 struct btf *get_map_kv_btf(const struct bpf_map_info *info)
{
struct btf *btf = NULL;
if (info->btf_vmlinux_value_type_id) {
if (!btf_vmlinux) {
btf_vmlinux = libbpf_find_kernel_btf();
if (IS_ERR(btf_vmlinux))
p_err("failed to get kernel btf");
}
return btf_vmlinux;
} else if (info->btf_value_type_id) {
int err;
err = btf__get_from_id(info->btf_id, &btf);
if (err || !btf) {
p_err("failed to get btf");
btf = err ? ERR_PTR(err) : ERR_PTR(-ESRCH);
}
}
return btf;
}
static void free_map_kv_btf(struct btf *btf)
{
if (!IS_ERR(btf) && btf != btf_vmlinux)
btf__free(btf);
}
static void free_btf_vmlinux(void)
{
if (!IS_ERR(btf_vmlinux))
btf__free(btf_vmlinux);
}
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) {
btf = get_map_kv_btf(info);
if (IS_ERR(btf)) {
err = PTR_ERR(btf);
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)
p_info("Warning: cannot read values from %s map with value_size != 8",
map_type_name[info->type]);
while (true) {
err = bpf_map_get_next_key(fd, prev_key, key);
if (err) {
if (errno == ENOENT)
err = 0;
break;
}
num_elems += dump_map_elem(fd, key, value, info, btf, wtr);
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_obj_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);
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 = NULL;
int err;
err = btf__get_from_id(info->btf_id, &btf);
if (err) {
p_err("failed to get 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)
{
struct bpf_create_map_attr attr = { NULL, };
const char *pinfile;
int err, 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 (attr.map_type) {
p_err("map type already specified");
return -1;
}
attr.map_type = map_type_from_str(*argv);
if ((int)attr.map_type < 0) {
p_err("unrecognized map type: %s", *argv);
return -1;
}
NEXT_ARG();
} else if (is_prefix(*argv, "name")) {
NEXT_ARG();
attr.name = GET_ARG();
} else if (is_prefix(*argv, "key")) {
if (parse_u32_arg(&argc, &argv, &attr.key_size,
"key size"))
return -1;
} else if (is_prefix(*argv, "value")) {
if (parse_u32_arg(&argc, &argv, &attr.value_size,
"value size"))
return -1;
} else if (is_prefix(*argv, "entries")) {
if (parse_u32_arg(&argc, &argv, &attr.max_entries,
"max entries"))
return -1;
} else if (is_prefix(*argv, "flags")) {
if (parse_u32_arg(&argc, &argv, &attr.map_flags,
"flags"))
return -1;
} else if (is_prefix(*argv, "dev")) {
NEXT_ARG();
if (attr.map_ifindex) {
p_err("offload device already specified");
return -1;
}
attr.map_ifindex = if_nametoindex(*argv);
if (!attr.map_ifindex) {
p_err("unrecognized netdevice '%s': %s",
*argv, strerror(errno));
return -1;
}
NEXT_ARG();
} else {
p_err("unknown arg %s", *argv);
return -1;
}
}
if (!attr.name) {
p_err("map name not specified");
return -1;
}
set_max_rlimit();
fd = bpf_create_map_xattr(&attr);
if (fd < 0) {
p_err("map create failed: %s", strerror(errno));
return -1;
}
err = do_pin_fd(fd, pinfile);
close(fd);
if (err)
return err;
if (json_output)
jsonw_null(json_wtr);
return 0;
}
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"
" [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 }\n"
" " HELP_SPEC_OPTIONS "\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);
}