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linux/tools/bpf/bpftool/btf.c
Quentin Monnet 4d374ba0bf tools: bpftool: implement "bpftool btf show|list" 
Add a "btf list" (alias: "btf show") subcommand to bpftool in order to
dump all BTF objects loaded on a system.

When running the command, hash tables are built in bpftool to retrieve
all the associations between BTF objects and BPF maps and programs. This
allows for printing all such associations when listing the BTF objects.

The command is added at the top of the subcommands for "bpftool btf", so
that typing only "bpftool btf" also comes down to listing the programs.
We could not have this with the previous command ("dump"), which
required a BTF object id, so it should not break any previous behaviour.
This also makes the "btf" command behaviour consistent with "prog" or
"map".

Bash completion is updated to use "bpftool btf" instead of "bpftool
prog" to list the BTF ids, as it looks more consistent.

Example output (plain):

    # bpftool btf show
    9: size 2989B  prog_ids 21  map_ids 15
    17: size 2847B  prog_ids 36  map_ids 30,29,28
    26: size 2847B

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-08-20 09:51:06 -07:00

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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2019 Facebook */
#include <errno.h>
#include <fcntl.h>
#include <linux/err.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <bpf.h>
#include <libbpf.h>
#include <linux/btf.h>
#include <linux/hashtable.h>
#include "btf.h"
#include "json_writer.h"
#include "main.h"
static const char * const btf_kind_str[NR_BTF_KINDS] = {
[BTF_KIND_UNKN] = "UNKNOWN",
[BTF_KIND_INT] = "INT",
[BTF_KIND_PTR] = "PTR",
[BTF_KIND_ARRAY] = "ARRAY",
[BTF_KIND_STRUCT] = "STRUCT",
[BTF_KIND_UNION] = "UNION",
[BTF_KIND_ENUM] = "ENUM",
[BTF_KIND_FWD] = "FWD",
[BTF_KIND_TYPEDEF] = "TYPEDEF",
[BTF_KIND_VOLATILE] = "VOLATILE",
[BTF_KIND_CONST] = "CONST",
[BTF_KIND_RESTRICT] = "RESTRICT",
[BTF_KIND_FUNC] = "FUNC",
[BTF_KIND_FUNC_PROTO] = "FUNC_PROTO",
[BTF_KIND_VAR] = "VAR",
[BTF_KIND_DATASEC] = "DATASEC",
};
struct btf_attach_table {
DECLARE_HASHTABLE(table, 16);
};
struct btf_attach_point {
__u32 obj_id;
__u32 btf_id;
struct hlist_node hash;
};
static const char *btf_int_enc_str(__u8 encoding)
{
switch (encoding) {
case 0:
return "(none)";
case BTF_INT_SIGNED:
return "SIGNED";
case BTF_INT_CHAR:
return "CHAR";
case BTF_INT_BOOL:
return "BOOL";
default:
return "UNKN";
}
}
static const char *btf_var_linkage_str(__u32 linkage)
{
switch (linkage) {
case BTF_VAR_STATIC:
return "static";
case BTF_VAR_GLOBAL_ALLOCATED:
return "global-alloc";
default:
return "(unknown)";
}
}
static const char *btf_str(const struct btf *btf, __u32 off)
{
if (!off)
return "(anon)";
return btf__name_by_offset(btf, off) ? : "(invalid)";
}
static int dump_btf_type(const struct btf *btf, __u32 id,
const struct btf_type *t)
{
json_writer_t *w = json_wtr;
int kind, safe_kind;
kind = BTF_INFO_KIND(t->info);
safe_kind = kind <= BTF_KIND_MAX ? kind : BTF_KIND_UNKN;
if (json_output) {
jsonw_start_object(w);
jsonw_uint_field(w, "id", id);
jsonw_string_field(w, "kind", btf_kind_str[safe_kind]);
jsonw_string_field(w, "name", btf_str(btf, t->name_off));
} else {
printf("[%u] %s '%s'", id, btf_kind_str[safe_kind],
btf_str(btf, t->name_off));
}
switch (BTF_INFO_KIND(t->info)) {
case BTF_KIND_INT: {
__u32 v = *(__u32 *)(t + 1);
const char *enc;
enc = btf_int_enc_str(BTF_INT_ENCODING(v));
if (json_output) {
jsonw_uint_field(w, "size", t->size);
jsonw_uint_field(w, "bits_offset", BTF_INT_OFFSET(v));
jsonw_uint_field(w, "nr_bits", BTF_INT_BITS(v));
jsonw_string_field(w, "encoding", enc);
} else {
printf(" size=%u bits_offset=%u nr_bits=%u encoding=%s",
t->size, BTF_INT_OFFSET(v), BTF_INT_BITS(v),
enc);
}
break;
}
case BTF_KIND_PTR:
case BTF_KIND_CONST:
case BTF_KIND_VOLATILE:
case BTF_KIND_RESTRICT:
case BTF_KIND_TYPEDEF:
if (json_output)
jsonw_uint_field(w, "type_id", t->type);
else
printf(" type_id=%u", t->type);
break;
case BTF_KIND_ARRAY: {
const struct btf_array *arr = (const void *)(t + 1);
if (json_output) {
jsonw_uint_field(w, "type_id", arr->type);
jsonw_uint_field(w, "index_type_id", arr->index_type);
jsonw_uint_field(w, "nr_elems", arr->nelems);
} else {
printf(" type_id=%u index_type_id=%u nr_elems=%u",
arr->type, arr->index_type, arr->nelems);
}
break;
}
case BTF_KIND_STRUCT:
case BTF_KIND_UNION: {
const struct btf_member *m = (const void *)(t + 1);
__u16 vlen = BTF_INFO_VLEN(t->info);
int i;
if (json_output) {
jsonw_uint_field(w, "size", t->size);
jsonw_uint_field(w, "vlen", vlen);
jsonw_name(w, "members");
jsonw_start_array(w);
} else {
printf(" size=%u vlen=%u", t->size, vlen);
}
for (i = 0; i < vlen; i++, m++) {
const char *name = btf_str(btf, m->name_off);
__u32 bit_off, bit_sz;
if (BTF_INFO_KFLAG(t->info)) {
bit_off = BTF_MEMBER_BIT_OFFSET(m->offset);
bit_sz = BTF_MEMBER_BITFIELD_SIZE(m->offset);
} else {
bit_off = m->offset;
bit_sz = 0;
}
if (json_output) {
jsonw_start_object(w);
jsonw_string_field(w, "name", name);
jsonw_uint_field(w, "type_id", m->type);
jsonw_uint_field(w, "bits_offset", bit_off);
if (bit_sz) {
jsonw_uint_field(w, "bitfield_size",
bit_sz);
}
jsonw_end_object(w);
} else {
printf("\n\t'%s' type_id=%u bits_offset=%u",
name, m->type, bit_off);
if (bit_sz)
printf(" bitfield_size=%u", bit_sz);
}
}
if (json_output)
jsonw_end_array(w);
break;
}
case BTF_KIND_ENUM: {
const struct btf_enum *v = (const void *)(t + 1);
__u16 vlen = BTF_INFO_VLEN(t->info);
int i;
if (json_output) {
jsonw_uint_field(w, "size", t->size);
jsonw_uint_field(w, "vlen", vlen);
jsonw_name(w, "values");
jsonw_start_array(w);
} else {
printf(" size=%u vlen=%u", t->size, vlen);
}
for (i = 0; i < vlen; i++, v++) {
const char *name = btf_str(btf, v->name_off);
if (json_output) {
jsonw_start_object(w);
jsonw_string_field(w, "name", name);
jsonw_uint_field(w, "val", v->val);
jsonw_end_object(w);
} else {
printf("\n\t'%s' val=%u", name, v->val);
}
}
if (json_output)
jsonw_end_array(w);
break;
}
case BTF_KIND_FWD: {
const char *fwd_kind = BTF_INFO_KFLAG(t->info) ? "union"
: "struct";
if (json_output)
jsonw_string_field(w, "fwd_kind", fwd_kind);
else
printf(" fwd_kind=%s", fwd_kind);
break;
}
case BTF_KIND_FUNC:
if (json_output)
jsonw_uint_field(w, "type_id", t->type);
else
printf(" type_id=%u", t->type);
break;
case BTF_KIND_FUNC_PROTO: {
const struct btf_param *p = (const void *)(t + 1);
__u16 vlen = BTF_INFO_VLEN(t->info);
int i;
if (json_output) {
jsonw_uint_field(w, "ret_type_id", t->type);
jsonw_uint_field(w, "vlen", vlen);
jsonw_name(w, "params");
jsonw_start_array(w);
} else {
printf(" ret_type_id=%u vlen=%u", t->type, vlen);
}
for (i = 0; i < vlen; i++, p++) {
const char *name = btf_str(btf, p->name_off);
if (json_output) {
jsonw_start_object(w);
jsonw_string_field(w, "name", name);
jsonw_uint_field(w, "type_id", p->type);
jsonw_end_object(w);
} else {
printf("\n\t'%s' type_id=%u", name, p->type);
}
}
if (json_output)
jsonw_end_array(w);
break;
}
case BTF_KIND_VAR: {
const struct btf_var *v = (const void *)(t + 1);
const char *linkage;
linkage = btf_var_linkage_str(v->linkage);
if (json_output) {
jsonw_uint_field(w, "type_id", t->type);
jsonw_string_field(w, "linkage", linkage);
} else {
printf(" type_id=%u, linkage=%s", t->type, linkage);
}
break;
}
case BTF_KIND_DATASEC: {
const struct btf_var_secinfo *v = (const void *)(t+1);
__u16 vlen = BTF_INFO_VLEN(t->info);
int i;
if (json_output) {
jsonw_uint_field(w, "size", t->size);
jsonw_uint_field(w, "vlen", vlen);
jsonw_name(w, "vars");
jsonw_start_array(w);
} else {
printf(" size=%u vlen=%u", t->size, vlen);
}
for (i = 0; i < vlen; i++, v++) {
if (json_output) {
jsonw_start_object(w);
jsonw_uint_field(w, "type_id", v->type);
jsonw_uint_field(w, "offset", v->offset);
jsonw_uint_field(w, "size", v->size);
jsonw_end_object(w);
} else {
printf("\n\ttype_id=%u offset=%u size=%u",
v->type, v->offset, v->size);
}
}
if (json_output)
jsonw_end_array(w);
break;
}
default:
break;
}
if (json_output)
jsonw_end_object(json_wtr);
else
printf("\n");
return 0;
}
static int dump_btf_raw(const struct btf *btf,
__u32 *root_type_ids, int root_type_cnt)
{
const struct btf_type *t;
int i;
if (json_output) {
jsonw_start_object(json_wtr);
jsonw_name(json_wtr, "types");
jsonw_start_array(json_wtr);
}
if (root_type_cnt) {
for (i = 0; i < root_type_cnt; i++) {
t = btf__type_by_id(btf, root_type_ids[i]);
dump_btf_type(btf, root_type_ids[i], t);
}
} else {
int cnt = btf__get_nr_types(btf);
for (i = 1; i <= cnt; i++) {
t = btf__type_by_id(btf, i);
dump_btf_type(btf, i, t);
}
}
if (json_output) {
jsonw_end_array(json_wtr);
jsonw_end_object(json_wtr);
}
return 0;
}
static void __printf(2, 0) btf_dump_printf(void *ctx,
const char *fmt, va_list args)
{
vfprintf(stdout, fmt, args);
}
static int dump_btf_c(const struct btf *btf,
__u32 *root_type_ids, int root_type_cnt)
{
struct btf_dump *d;
int err = 0, i;
d = btf_dump__new(btf, NULL, NULL, btf_dump_printf);
if (IS_ERR(d))
return PTR_ERR(d);
if (root_type_cnt) {
for (i = 0; i < root_type_cnt; i++) {
err = btf_dump__dump_type(d, root_type_ids[i]);
if (err)
goto done;
}
} else {
int cnt = btf__get_nr_types(btf);
for (i = 1; i <= cnt; i++) {
err = btf_dump__dump_type(d, i);
if (err)
goto done;
}
}
done:
btf_dump__free(d);
return err;
}
static int do_dump(int argc, char **argv)
{
struct btf *btf = NULL;
__u32 root_type_ids[2];
int root_type_cnt = 0;
bool dump_c = false;
__u32 btf_id = -1;
const char *src;
int fd = -1;
int err;
if (!REQ_ARGS(2)) {
usage();
return -1;
}
src = GET_ARG();
if (is_prefix(src, "map")) {
struct bpf_map_info info = {};
__u32 len = sizeof(info);
if (!REQ_ARGS(2)) {
usage();
return -1;
}
fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
if (fd < 0)
return -1;
btf_id = info.btf_id;
if (argc && is_prefix(*argv, "key")) {
root_type_ids[root_type_cnt++] = info.btf_key_type_id;
NEXT_ARG();
} else if (argc && is_prefix(*argv, "value")) {
root_type_ids[root_type_cnt++] = info.btf_value_type_id;
NEXT_ARG();
} else if (argc && is_prefix(*argv, "all")) {
NEXT_ARG();
} else if (argc && is_prefix(*argv, "kv")) {
root_type_ids[root_type_cnt++] = info.btf_key_type_id;
root_type_ids[root_type_cnt++] = info.btf_value_type_id;
NEXT_ARG();
} else {
root_type_ids[root_type_cnt++] = info.btf_key_type_id;
root_type_ids[root_type_cnt++] = info.btf_value_type_id;
}
} else if (is_prefix(src, "prog")) {
struct bpf_prog_info info = {};
__u32 len = sizeof(info);
if (!REQ_ARGS(2)) {
usage();
return -1;
}
fd = prog_parse_fd(&argc, &argv);
if (fd < 0)
return -1;
err = bpf_obj_get_info_by_fd(fd, &info, &len);
if (err) {
p_err("can't get prog info: %s", strerror(errno));
goto done;
}
btf_id = info.btf_id;
} else if (is_prefix(src, "id")) {
char *endptr;
btf_id = strtoul(*argv, &endptr, 0);
if (*endptr) {
p_err("can't parse %s as ID", *argv);
return -1;
}
NEXT_ARG();
} else if (is_prefix(src, "file")) {
btf = btf__parse_elf(*argv, NULL);
if (IS_ERR(btf)) {
err = PTR_ERR(btf);
btf = NULL;
p_err("failed to load BTF from %s: %s",
*argv, strerror(err));
goto done;
}
NEXT_ARG();
} else {
err = -1;
p_err("unrecognized BTF source specifier: '%s'", src);
goto done;
}
while (argc) {
if (is_prefix(*argv, "format")) {
NEXT_ARG();
if (argc < 1) {
p_err("expecting value for 'format' option\n");
goto done;
}
if (strcmp(*argv, "c") == 0) {
dump_c = true;
} else if (strcmp(*argv, "raw") == 0) {
dump_c = false;
} else {
p_err("unrecognized format specifier: '%s', possible values: raw, c",
*argv);
goto done;
}
NEXT_ARG();
} else {
p_err("unrecognized option: '%s'", *argv);
goto done;
}
}
if (!btf) {
err = btf__get_from_id(btf_id, &btf);
if (err) {
p_err("get btf by id (%u): %s", btf_id, strerror(err));
goto done;
}
if (!btf) {
err = ENOENT;
p_err("can't find btf with ID (%u)", btf_id);
goto done;
}
}
if (dump_c) {
if (json_output) {
p_err("JSON output for C-syntax dump is not supported");
err = -ENOTSUP;
goto done;
}
err = dump_btf_c(btf, root_type_ids, root_type_cnt);
} else {
err = dump_btf_raw(btf, root_type_ids, root_type_cnt);
}
done:
close(fd);
btf__free(btf);
return err;
}
static int btf_parse_fd(int *argc, char ***argv)
{
unsigned int id;
char *endptr;
int fd;
if (!is_prefix(*argv[0], "id")) {
p_err("expected 'id', got: '%s'?", **argv);
return -1;
}
NEXT_ARGP();
id = strtoul(**argv, &endptr, 0);
if (*endptr) {
p_err("can't parse %s as ID", **argv);
return -1;
}
NEXT_ARGP();
fd = bpf_btf_get_fd_by_id(id);
if (fd < 0)
p_err("can't get BTF object by id (%u): %s",
id, strerror(errno));
return fd;
}
static void delete_btf_table(struct btf_attach_table *tab)
{
struct btf_attach_point *obj;
struct hlist_node *tmp;
unsigned int bkt;
hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
hash_del(&obj->hash);
free(obj);
}
}
static int
build_btf_type_table(struct btf_attach_table *tab, enum bpf_obj_type type,
void *info, __u32 *len)
{
static const char * const names[] = {
[BPF_OBJ_UNKNOWN] = "unknown",
[BPF_OBJ_PROG] = "prog",
[BPF_OBJ_MAP] = "map",
};
struct btf_attach_point *obj_node;
__u32 btf_id, id = 0;
int err;
int fd;
while (true) {
switch (type) {
case BPF_OBJ_PROG:
err = bpf_prog_get_next_id(id, &id);
break;
case BPF_OBJ_MAP:
err = bpf_map_get_next_id(id, &id);
break;
default:
err = -1;
p_err("unexpected object type: %d", type);
goto err_free;
}
if (err) {
if (errno == ENOENT) {
err = 0;
break;
}
p_err("can't get next %s: %s%s", names[type],
strerror(errno),
errno == EINVAL ? " -- kernel too old?" : "");
goto err_free;
}
switch (type) {
case BPF_OBJ_PROG:
fd = bpf_prog_get_fd_by_id(id);
break;
case BPF_OBJ_MAP:
fd = bpf_map_get_fd_by_id(id);
break;
default:
err = -1;
p_err("unexpected object type: %d", type);
goto err_free;
}
if (fd < 0) {
if (errno == ENOENT)
continue;
p_err("can't get %s by id (%u): %s", names[type], id,
strerror(errno));
err = -1;
goto err_free;
}
memset(info, 0, *len);
err = bpf_obj_get_info_by_fd(fd, info, len);
close(fd);
if (err) {
p_err("can't get %s info: %s", names[type],
strerror(errno));
goto err_free;
}
switch (type) {
case BPF_OBJ_PROG:
btf_id = ((struct bpf_prog_info *)info)->btf_id;
break;
case BPF_OBJ_MAP:
btf_id = ((struct bpf_map_info *)info)->btf_id;
break;
default:
err = -1;
p_err("unexpected object type: %d", type);
goto err_free;
}
if (!btf_id)
continue;
obj_node = calloc(1, sizeof(*obj_node));
if (!obj_node) {
p_err("failed to allocate memory: %s", strerror(errno));
goto err_free;
}
obj_node->obj_id = id;
obj_node->btf_id = btf_id;
hash_add(tab->table, &obj_node->hash, obj_node->btf_id);
}
return 0;
err_free:
delete_btf_table(tab);
return err;
}
static int
build_btf_tables(struct btf_attach_table *btf_prog_table,
struct btf_attach_table *btf_map_table)
{
struct bpf_prog_info prog_info;
__u32 prog_len = sizeof(prog_info);
struct bpf_map_info map_info;
__u32 map_len = sizeof(map_info);
int err = 0;
err = build_btf_type_table(btf_prog_table, BPF_OBJ_PROG, &prog_info,
&prog_len);
if (err)
return err;
err = build_btf_type_table(btf_map_table, BPF_OBJ_MAP, &map_info,
&map_len);
if (err) {
delete_btf_table(btf_prog_table);
return err;
}
return 0;
}
static void
show_btf_plain(struct bpf_btf_info *info, int fd,
struct btf_attach_table *btf_prog_table,
struct btf_attach_table *btf_map_table)
{
struct btf_attach_point *obj;
int n;
printf("%u: ", info->id);
printf("size %uB", info->btf_size);
n = 0;
hash_for_each_possible(btf_prog_table->table, obj, hash, info->id) {
if (obj->btf_id == info->id)
printf("%s%u", n++ == 0 ? " prog_ids " : ",",
obj->obj_id);
}
n = 0;
hash_for_each_possible(btf_map_table->table, obj, hash, info->id) {
if (obj->btf_id == info->id)
printf("%s%u", n++ == 0 ? " map_ids " : ",",
obj->obj_id);
}
printf("\n");
}
static void
show_btf_json(struct bpf_btf_info *info, int fd,
struct btf_attach_table *btf_prog_table,
struct btf_attach_table *btf_map_table)
{
struct btf_attach_point *obj;
jsonw_start_object(json_wtr); /* btf object */
jsonw_uint_field(json_wtr, "id", info->id);
jsonw_uint_field(json_wtr, "size", info->btf_size);
jsonw_name(json_wtr, "prog_ids");
jsonw_start_array(json_wtr); /* prog_ids */
hash_for_each_possible(btf_prog_table->table, obj, hash,
info->id) {
if (obj->btf_id == info->id)
jsonw_uint(json_wtr, obj->obj_id);
}
jsonw_end_array(json_wtr); /* prog_ids */
jsonw_name(json_wtr, "map_ids");
jsonw_start_array(json_wtr); /* map_ids */
hash_for_each_possible(btf_map_table->table, obj, hash,
info->id) {
if (obj->btf_id == info->id)
jsonw_uint(json_wtr, obj->obj_id);
}
jsonw_end_array(json_wtr); /* map_ids */
jsonw_end_object(json_wtr); /* btf object */
}
static int
show_btf(int fd, struct btf_attach_table *btf_prog_table,
struct btf_attach_table *btf_map_table)
{
struct bpf_btf_info info = {};
__u32 len = sizeof(info);
int err;
err = bpf_obj_get_info_by_fd(fd, &info, &len);
if (err) {
p_err("can't get BTF object info: %s", strerror(errno));
return -1;
}
if (json_output)
show_btf_json(&info, fd, btf_prog_table, btf_map_table);
else
show_btf_plain(&info, fd, btf_prog_table, btf_map_table);
return 0;
}
static int do_show(int argc, char **argv)
{
struct btf_attach_table btf_prog_table;
struct btf_attach_table btf_map_table;
int err, fd = -1;
__u32 id = 0;
if (argc == 2) {
fd = btf_parse_fd(&argc, &argv);
if (fd < 0)
return -1;
}
if (argc) {
if (fd >= 0)
close(fd);
return BAD_ARG();
}
hash_init(btf_prog_table.table);
hash_init(btf_map_table.table);
err = build_btf_tables(&btf_prog_table, &btf_map_table);
if (err) {
if (fd >= 0)
close(fd);
return err;
}
if (fd >= 0) {
err = show_btf(fd, &btf_prog_table, &btf_map_table);
close(fd);
goto exit_free;
}
if (json_output)
jsonw_start_array(json_wtr); /* root array */
while (true) {
err = bpf_btf_get_next_id(id, &id);
if (err) {
if (errno == ENOENT) {
err = 0;
break;
}
p_err("can't get next BTF object: %s%s",
strerror(errno),
errno == EINVAL ? " -- kernel too old?" : "");
err = -1;
break;
}
fd = bpf_btf_get_fd_by_id(id);
if (fd < 0) {
if (errno == ENOENT)
continue;
p_err("can't get BTF object by id (%u): %s",
id, strerror(errno));
err = -1;
break;
}
err = show_btf(fd, &btf_prog_table, &btf_map_table);
close(fd);
if (err)
break;
}
if (json_output)
jsonw_end_array(json_wtr); /* root array */
exit_free:
delete_btf_table(&btf_prog_table);
delete_btf_table(&btf_map_table);
return err;
}
static int do_help(int argc, char **argv)
{
if (json_output) {
jsonw_null(json_wtr);
return 0;
}
fprintf(stderr,
"Usage: %s btf { show | list } [id BTF_ID]\n"
" %s btf dump BTF_SRC [format FORMAT]\n"
" %s btf help\n"
"\n"
" BTF_SRC := { id BTF_ID | prog PROG | map MAP [{key | value | kv | all}] | file FILE }\n"
" FORMAT := { raw | c }\n"
" " HELP_SPEC_MAP "\n"
" " HELP_SPEC_PROGRAM "\n"
" " HELP_SPEC_OPTIONS "\n"
"",
bin_name, bin_name, bin_name);
return 0;
}
static const struct cmd cmds[] = {
{ "show", do_show },
{ "list", do_show },
{ "help", do_help },
{ "dump", do_dump },
{ 0 }
};
int do_btf(int argc, char **argv)
{
return cmd_select(cmds, argc, argv, do_help);
}
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