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linux/tools/bpf/bpftool/prog.c

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/*
* Copyright (C) 2017-2018 Netronome Systems, Inc.
*
* This software is dual licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
* source tree or the BSD 2-Clause License provided below. You have the
* option to license this software under the complete terms of either license.
*
* The BSD 2-Clause License:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <net/if.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/err.h>
#include <bpf.h>
#include <libbpf.h>
#include "cfg.h"
#include "main.h"
#include "xlated_dumper.h"
static const char * const prog_type_name[] = {
[BPF_PROG_TYPE_UNSPEC] = "unspec",
[BPF_PROG_TYPE_SOCKET_FILTER] = "socket_filter",
[BPF_PROG_TYPE_KPROBE] = "kprobe",
[BPF_PROG_TYPE_SCHED_CLS] = "sched_cls",
[BPF_PROG_TYPE_SCHED_ACT] = "sched_act",
[BPF_PROG_TYPE_TRACEPOINT] = "tracepoint",
[BPF_PROG_TYPE_XDP] = "xdp",
[BPF_PROG_TYPE_PERF_EVENT] = "perf_event",
[BPF_PROG_TYPE_CGROUP_SKB] = "cgroup_skb",
[BPF_PROG_TYPE_CGROUP_SOCK] = "cgroup_sock",
[BPF_PROG_TYPE_LWT_IN] = "lwt_in",
[BPF_PROG_TYPE_LWT_OUT] = "lwt_out",
[BPF_PROG_TYPE_LWT_XMIT] = "lwt_xmit",
[BPF_PROG_TYPE_SOCK_OPS] = "sock_ops",
[BPF_PROG_TYPE_SK_SKB] = "sk_skb",
[BPF_PROG_TYPE_CGROUP_DEVICE] = "cgroup_device",
[BPF_PROG_TYPE_SK_MSG] = "sk_msg",
[BPF_PROG_TYPE_RAW_TRACEPOINT] = "raw_tracepoint",
[BPF_PROG_TYPE_CGROUP_SOCK_ADDR] = "cgroup_sock_addr",
[BPF_PROG_TYPE_LIRC_MODE2] = "lirc_mode2",
[BPF_PROG_TYPE_FLOW_DISSECTOR] = "flow_dissector",
};
static const char * const attach_type_strings[] = {
[BPF_SK_SKB_STREAM_PARSER] = "stream_parser",
[BPF_SK_SKB_STREAM_VERDICT] = "stream_verdict",
[BPF_SK_MSG_VERDICT] = "msg_verdict",
[BPF_FLOW_DISSECTOR] = "flow_dissector",
[__MAX_BPF_ATTACH_TYPE] = NULL,
};
enum bpf_attach_type parse_attach_type(const char *str)
{
enum bpf_attach_type type;
for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++) {
if (attach_type_strings[type] &&
is_prefix(str, attach_type_strings[type]))
return type;
}
return __MAX_BPF_ATTACH_TYPE;
}
static void print_boot_time(__u64 nsecs, char *buf, unsigned int size)
{
struct timespec real_time_ts, boot_time_ts;
time_t wallclock_secs;
struct tm load_tm;
buf[--size] = '\0';
if (clock_gettime(CLOCK_REALTIME, &real_time_ts) ||
clock_gettime(CLOCK_BOOTTIME, &boot_time_ts)) {
perror("Can't read clocks");
snprintf(buf, size, "%llu", nsecs / 1000000000);
return;
}
wallclock_secs = (real_time_ts.tv_sec - boot_time_ts.tv_sec) +
(real_time_ts.tv_nsec - boot_time_ts.tv_nsec + nsecs) /
1000000000;
if (!localtime_r(&wallclock_secs, &load_tm)) {
snprintf(buf, size, "%llu", nsecs / 1000000000);
return;
}
if (json_output)
strftime(buf, size, "%s", &load_tm);
else
strftime(buf, size, "%FT%T%z", &load_tm);
}
static int prog_fd_by_tag(unsigned char *tag)
{
struct bpf_prog_info info = {};
__u32 len = sizeof(info);
unsigned int id = 0;
int err;
int fd;
while (true) {
err = bpf_prog_get_next_id(id, &id);
if (err) {
p_err("%s", strerror(errno));
return -1;
}
fd = bpf_prog_get_fd_by_id(id);
if (fd < 0) {
p_err("can't get prog by id (%u): %s",
id, strerror(errno));
return -1;
}
err = bpf_obj_get_info_by_fd(fd, &info, &len);
if (err) {
p_err("can't get prog info (%u): %s",
id, strerror(errno));
close(fd);
return -1;
}
if (!memcmp(tag, info.tag, BPF_TAG_SIZE))
return fd;
close(fd);
}
}
int prog_parse_fd(int *argc, char ***argv)
{
int fd;
if (is_prefix(**argv, "id")) {
unsigned int id;
char *endptr;
NEXT_ARGP();
id = strtoul(**argv, &endptr, 0);
if (*endptr) {
p_err("can't parse %s as ID", **argv);
return -1;
}
NEXT_ARGP();
fd = bpf_prog_get_fd_by_id(id);
if (fd < 0)
p_err("get by id (%u): %s", id, strerror(errno));
return fd;
} else if (is_prefix(**argv, "tag")) {
unsigned char tag[BPF_TAG_SIZE];
NEXT_ARGP();
if (sscanf(**argv, BPF_TAG_FMT, tag, tag + 1, tag + 2,
tag + 3, tag + 4, tag + 5, tag + 6, tag + 7)
!= BPF_TAG_SIZE) {
p_err("can't parse tag");
return -1;
}
NEXT_ARGP();
return prog_fd_by_tag(tag);
} else if (is_prefix(**argv, "pinned")) {
char *path;
NEXT_ARGP();
path = **argv;
NEXT_ARGP();
return open_obj_pinned_any(path, BPF_OBJ_PROG);
}
p_err("expected 'id', 'tag' or 'pinned', got: '%s'?", **argv);
return -1;
}
static void show_prog_maps(int fd, u32 num_maps)
{
struct bpf_prog_info info = {};
__u32 len = sizeof(info);
__u32 map_ids[num_maps];
unsigned int i;
int err;
info.nr_map_ids = num_maps;
info.map_ids = ptr_to_u64(map_ids);
err = bpf_obj_get_info_by_fd(fd, &info, &len);
if (err || !info.nr_map_ids)
return;
if (json_output) {
jsonw_name(json_wtr, "map_ids");
jsonw_start_array(json_wtr);
for (i = 0; i < info.nr_map_ids; i++)
jsonw_uint(json_wtr, map_ids[i]);
jsonw_end_array(json_wtr);
} else {
printf(" map_ids ");
for (i = 0; i < info.nr_map_ids; i++)
printf("%u%s", map_ids[i],
i == info.nr_map_ids - 1 ? "" : ",");
}
}
static void print_prog_json(struct bpf_prog_info *info, int fd)
{
char *memlock;
jsonw_start_object(json_wtr);
jsonw_uint_field(json_wtr, "id", info->id);
if (info->type < ARRAY_SIZE(prog_type_name))
jsonw_string_field(json_wtr, "type",
prog_type_name[info->type]);
else
jsonw_uint_field(json_wtr, "type", info->type);
if (*info->name)
jsonw_string_field(json_wtr, "name", info->name);
jsonw_name(json_wtr, "tag");
jsonw_printf(json_wtr, "\"" BPF_TAG_FMT "\"",
info->tag[0], info->tag[1], info->tag[2], info->tag[3],
info->tag[4], info->tag[5], info->tag[6], info->tag[7]);
jsonw_bool_field(json_wtr, "gpl_compatible", info->gpl_compatible);
print_dev_json(info->ifindex, info->netns_dev, info->netns_ino);
if (info->load_time) {
char buf[32];
print_boot_time(info->load_time, buf, sizeof(buf));
/* Piggy back on load_time, since 0 uid is a valid one */
jsonw_name(json_wtr, "loaded_at");
jsonw_printf(json_wtr, "%s", buf);
jsonw_uint_field(json_wtr, "uid", info->created_by_uid);
}
jsonw_uint_field(json_wtr, "bytes_xlated", info->xlated_prog_len);
if (info->jited_prog_len) {
jsonw_bool_field(json_wtr, "jited", true);
jsonw_uint_field(json_wtr, "bytes_jited", info->jited_prog_len);
} else {
jsonw_bool_field(json_wtr, "jited", false);
}
memlock = get_fdinfo(fd, "memlock");
if (memlock)
jsonw_int_field(json_wtr, "bytes_memlock", atoi(memlock));
free(memlock);
if (info->nr_map_ids)
show_prog_maps(fd, info->nr_map_ids);
if (!hash_empty(prog_table.table)) {
struct pinned_obj *obj;
jsonw_name(json_wtr, "pinned");
jsonw_start_array(json_wtr);
hash_for_each_possible(prog_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);
}
static void print_prog_plain(struct bpf_prog_info *info, int fd)
{
char *memlock;
printf("%u: ", info->id);
if (info->type < ARRAY_SIZE(prog_type_name))
printf("%s ", prog_type_name[info->type]);
else
printf("type %u ", info->type);
if (*info->name)
printf("name %s ", info->name);
printf("tag ");
fprint_hex(stdout, info->tag, BPF_TAG_SIZE, "");
print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino);
printf("%s", info->gpl_compatible ? " gpl" : "");
printf("\n");
if (info->load_time) {
char buf[32];
print_boot_time(info->load_time, buf, sizeof(buf));
/* Piggy back on load_time, since 0 uid is a valid one */
printf("\tloaded_at %s uid %u\n", buf, info->created_by_uid);
}
printf("\txlated %uB", info->xlated_prog_len);
if (info->jited_prog_len)
printf(" jited %uB", info->jited_prog_len);
else
printf(" not jited");
memlock = get_fdinfo(fd, "memlock");
if (memlock)
printf(" memlock %sB", memlock);
free(memlock);
if (info->nr_map_ids)
show_prog_maps(fd, info->nr_map_ids);
if (!hash_empty(prog_table.table)) {
struct pinned_obj *obj;
printf("\n");
hash_for_each_possible(prog_table.table, obj, hash, info->id) {
if (obj->id == info->id)
printf("\tpinned %s\n", obj->path);
}
}
printf("\n");
}
static int show_prog(int fd)
{
struct bpf_prog_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 prog info: %s", strerror(errno));
return -1;
}
if (json_output)
print_prog_json(&info, fd);
else
print_prog_plain(&info, fd);
return 0;
}
static int do_show(int argc, char **argv)
{
__u32 id = 0;
int err;
int fd;
if (show_pinned)
build_pinned_obj_table(&prog_table, BPF_OBJ_PROG);
if (argc == 2) {
fd = prog_parse_fd(&argc, &argv);
if (fd < 0)
return -1;
return show_prog(fd);
}
if (argc)
return BAD_ARG();
if (json_output)
jsonw_start_array(json_wtr);
while (true) {
err = bpf_prog_get_next_id(id, &id);
if (err) {
if (errno == ENOENT) {
err = 0;
break;
}
p_err("can't get next program: %s%s", strerror(errno),
errno == EINVAL ? " -- kernel too old?" : "");
err = -1;
break;
}
fd = bpf_prog_get_fd_by_id(id);
if (fd < 0) {
if (errno == ENOENT)
continue;
p_err("can't get prog by id (%u): %s",
id, strerror(errno));
err = -1;
break;
}
err = show_prog(fd);
close(fd);
if (err)
break;
}
if (json_output)
jsonw_end_array(json_wtr);
return err;
}
static int do_dump(int argc, char **argv)
{
unsigned long *func_ksyms = NULL;
struct bpf_prog_info info = {};
unsigned int *func_lens = NULL;
const char *disasm_opt = NULL;
unsigned int nr_func_ksyms;
unsigned int nr_func_lens;
struct dump_data dd = {};
__u32 len = sizeof(info);
unsigned int buf_size;
char *filepath = NULL;
bool opcodes = false;
bool visual = false;
unsigned char *buf;
__u32 *member_len;
__u64 *member_ptr;
ssize_t n;
int err;
int fd;
if (is_prefix(*argv, "jited")) {
member_len = &info.jited_prog_len;
member_ptr = &info.jited_prog_insns;
} else if (is_prefix(*argv, "xlated")) {
member_len = &info.xlated_prog_len;
member_ptr = &info.xlated_prog_insns;
} else {
p_err("expected 'xlated' or 'jited', got: %s", *argv);
return -1;
}
NEXT_ARG();
if (argc < 2)
usage();
fd = prog_parse_fd(&argc, &argv);
if (fd < 0)
return -1;
if (is_prefix(*argv, "file")) {
NEXT_ARG();
if (!argc) {
p_err("expected file path");
return -1;
}
filepath = *argv;
NEXT_ARG();
} else if (is_prefix(*argv, "opcodes")) {
opcodes = true;
NEXT_ARG();
} else if (is_prefix(*argv, "visual")) {
visual = true;
NEXT_ARG();
}
if (argc) {
usage();
return -1;
}
err = bpf_obj_get_info_by_fd(fd, &info, &len);
if (err) {
p_err("can't get prog info: %s", strerror(errno));
return -1;
}
if (!*member_len) {
p_info("no instructions returned");
close(fd);
return 0;
}
buf_size = *member_len;
buf = malloc(buf_size);
if (!buf) {
p_err("mem alloc failed");
close(fd);
return -1;
}
nr_func_ksyms = info.nr_jited_ksyms;
if (nr_func_ksyms) {
func_ksyms = malloc(nr_func_ksyms * sizeof(__u64));
if (!func_ksyms) {
p_err("mem alloc failed");
close(fd);
goto err_free;
}
}
nr_func_lens = info.nr_jited_func_lens;
if (nr_func_lens) {
func_lens = malloc(nr_func_lens * sizeof(__u32));
if (!func_lens) {
p_err("mem alloc failed");
close(fd);
goto err_free;
}
}
memset(&info, 0, sizeof(info));
*member_ptr = ptr_to_u64(buf);
*member_len = buf_size;
info.jited_ksyms = ptr_to_u64(func_ksyms);
info.nr_jited_ksyms = nr_func_ksyms;
info.jited_func_lens = ptr_to_u64(func_lens);
info.nr_jited_func_lens = nr_func_lens;
err = bpf_obj_get_info_by_fd(fd, &info, &len);
close(fd);
if (err) {
p_err("can't get prog info: %s", strerror(errno));
goto err_free;
}
if (*member_len > buf_size) {
p_err("too many instructions returned");
goto err_free;
}
if (info.nr_jited_ksyms > nr_func_ksyms) {
p_err("too many addresses returned");
goto err_free;
}
if (info.nr_jited_func_lens > nr_func_lens) {
p_err("too many values returned");
goto err_free;
}
if ((member_len == &info.jited_prog_len &&
info.jited_prog_insns == 0) ||
(member_len == &info.xlated_prog_len &&
info.xlated_prog_insns == 0)) {
p_err("error retrieving insn dump: kernel.kptr_restrict set?");
goto err_free;
}
if (filepath) {
fd = open(filepath, O_WRONLY | O_CREAT | O_TRUNC, 0600);
if (fd < 0) {
p_err("can't open file %s: %s", filepath,
strerror(errno));
goto err_free;
}
n = write(fd, buf, *member_len);
close(fd);
if (n != *member_len) {
p_err("error writing output file: %s",
n < 0 ? strerror(errno) : "short write");
goto err_free;
}
if (json_output)
jsonw_null(json_wtr);
} else if (member_len == &info.jited_prog_len) {
const char *name = NULL;
if (info.ifindex) {
name = ifindex_to_bfd_params(info.ifindex,
info.netns_dev,
info.netns_ino,
&disasm_opt);
if (!name)
goto err_free;
}
if (info.nr_jited_func_lens && info.jited_func_lens) {
struct kernel_sym *sym = NULL;
char sym_name[SYM_MAX_NAME];
unsigned char *img = buf;
__u64 *ksyms = NULL;
__u32 *lens;
__u32 i;
if (info.nr_jited_ksyms) {
kernel_syms_load(&dd);
ksyms = (__u64 *) info.jited_ksyms;
}
if (json_output)
jsonw_start_array(json_wtr);
lens = (__u32 *) info.jited_func_lens;
for (i = 0; i < info.nr_jited_func_lens; i++) {
if (ksyms) {
sym = kernel_syms_search(&dd, ksyms[i]);
if (sym)
sprintf(sym_name, "%s", sym->name);
else
sprintf(sym_name, "0x%016llx", ksyms[i]);
} else {
strcpy(sym_name, "unknown");
}
if (json_output) {
jsonw_start_object(json_wtr);
jsonw_name(json_wtr, "name");
jsonw_string(json_wtr, sym_name);
jsonw_name(json_wtr, "insns");
} else {
printf("%s:\n", sym_name);
}
disasm_print_insn(img, lens[i], opcodes, name,
disasm_opt);
img += lens[i];
if (json_output)
jsonw_end_object(json_wtr);
else
printf("\n");
}
if (json_output)
jsonw_end_array(json_wtr);
} else {
disasm_print_insn(buf, *member_len, opcodes, name,
disasm_opt);
}
} else if (visual) {
if (json_output)
jsonw_null(json_wtr);
else
dump_xlated_cfg(buf, *member_len);
} else {
kernel_syms_load(&dd);
dd.nr_jited_ksyms = info.nr_jited_ksyms;
dd.jited_ksyms = (__u64 *) info.jited_ksyms;
if (json_output)
dump_xlated_json(&dd, buf, *member_len, opcodes);
else
dump_xlated_plain(&dd, buf, *member_len, opcodes);
kernel_syms_destroy(&dd);
}
free(buf);
free(func_ksyms);
free(func_lens);
return 0;
err_free:
free(buf);
free(func_ksyms);
free(func_lens);
return -1;
}
static int do_pin(int argc, char **argv)
{
int err;
err = do_pin_any(argc, argv, bpf_prog_get_fd_by_id);
if (!err && json_output)
jsonw_null(json_wtr);
return err;
}
struct map_replace {
int idx;
int fd;
char *name;
};
int map_replace_compar(const void *p1, const void *p2)
{
const struct map_replace *a = p1, *b = p2;
return a->idx - b->idx;
}
static int parse_attach_detach_args(int argc, char **argv, int *progfd,
enum bpf_attach_type *attach_type,
int *mapfd)
{
if (!REQ_ARGS(3))
return -EINVAL;
*progfd = prog_parse_fd(&argc, &argv);
if (*progfd < 0)
return *progfd;
*attach_type = parse_attach_type(*argv);
if (*attach_type == __MAX_BPF_ATTACH_TYPE) {
p_err("invalid attach/detach type");
return -EINVAL;
}
if (*attach_type == BPF_FLOW_DISSECTOR) {
*mapfd = -1;
return 0;
}
NEXT_ARG();
if (!REQ_ARGS(2))
return -EINVAL;
*mapfd = map_parse_fd(&argc, &argv);
if (*mapfd < 0)
return *mapfd;
return 0;
}
static int do_attach(int argc, char **argv)
{
enum bpf_attach_type attach_type;
int err, progfd;
int mapfd;
err = parse_attach_detach_args(argc, argv,
&progfd, &attach_type, &mapfd);
if (err)
return err;
err = bpf_prog_attach(progfd, mapfd, attach_type, 0);
if (err) {
p_err("failed prog attach to map");
return -EINVAL;
}
if (json_output)
jsonw_null(json_wtr);
return 0;
}
static int do_detach(int argc, char **argv)
{
enum bpf_attach_type attach_type;
int err, progfd;
int mapfd;
err = parse_attach_detach_args(argc, argv,
&progfd, &attach_type, &mapfd);
if (err)
return err;
err = bpf_prog_detach2(progfd, mapfd, attach_type);
if (err) {
p_err("failed prog detach from map");
return -EINVAL;
}
if (json_output)
jsonw_null(json_wtr);
return 0;
}
static int load_with_options(int argc, char **argv, bool first_prog_only)
{
enum bpf_attach_type expected_attach_type;
struct bpf_object_open_attr attr = {
.prog_type = BPF_PROG_TYPE_UNSPEC,
};
struct map_replace *map_replace = NULL;
struct bpf_program *prog = NULL, *pos;
unsigned int old_map_fds = 0;
const char *pinmaps = NULL;
struct bpf_object *obj;
struct bpf_map *map;
const char *pinfile;
unsigned int i, j;
__u32 ifindex = 0;
int idx, err;
if (!REQ_ARGS(2))
return -1;
attr.file = GET_ARG();
pinfile = GET_ARG();
while (argc) {
if (is_prefix(*argv, "type")) {
char *type;
NEXT_ARG();
if (attr.prog_type != BPF_PROG_TYPE_UNSPEC) {
p_err("program type already specified");
goto err_free_reuse_maps;
}
if (!REQ_ARGS(1))
goto err_free_reuse_maps;
/* Put a '/' at the end of type to appease libbpf */
type = malloc(strlen(*argv) + 2);
if (!type) {
p_err("mem alloc failed");
goto err_free_reuse_maps;
}
*type = 0;
strcat(type, *argv);
strcat(type, "/");
err = libbpf_prog_type_by_name(type, &attr.prog_type,
&expected_attach_type);
free(type);
if (err < 0) {
p_err("unknown program type '%s'", *argv);
goto err_free_reuse_maps;
}
NEXT_ARG();
} else if (is_prefix(*argv, "map")) {
char *endptr, *name;
int fd;
NEXT_ARG();
if (!REQ_ARGS(4))
goto err_free_reuse_maps;
if (is_prefix(*argv, "idx")) {
NEXT_ARG();
idx = strtoul(*argv, &endptr, 0);
if (*endptr) {
p_err("can't parse %s as IDX", *argv);
goto err_free_reuse_maps;
}
name = NULL;
} else if (is_prefix(*argv, "name")) {
NEXT_ARG();
name = *argv;
idx = -1;
} else {
p_err("expected 'idx' or 'name', got: '%s'?",
*argv);
goto err_free_reuse_maps;
}
NEXT_ARG();
fd = map_parse_fd(&argc, &argv);
if (fd < 0)
goto err_free_reuse_maps;
map_replace = reallocarray(map_replace, old_map_fds + 1,
sizeof(*map_replace));
if (!map_replace) {
p_err("mem alloc failed");
goto err_free_reuse_maps;
}
map_replace[old_map_fds].idx = idx;
map_replace[old_map_fds].name = name;
map_replace[old_map_fds].fd = fd;
old_map_fds++;
} else if (is_prefix(*argv, "dev")) {
NEXT_ARG();
if (ifindex) {
p_err("offload device already specified");
goto err_free_reuse_maps;
}
if (!REQ_ARGS(1))
goto err_free_reuse_maps;
ifindex = if_nametoindex(*argv);
if (!ifindex) {
p_err("unrecognized netdevice '%s': %s",
*argv, strerror(errno));
goto err_free_reuse_maps;
}
NEXT_ARG();
} else if (is_prefix(*argv, "pinmaps")) {
NEXT_ARG();
if (!REQ_ARGS(1))
goto err_free_reuse_maps;
pinmaps = GET_ARG();
} else {
p_err("expected no more arguments, 'type', 'map' or 'dev', got: '%s'?",
*argv);
goto err_free_reuse_maps;
}
}
obj = __bpf_object__open_xattr(&attr, bpf_flags);
if (IS_ERR_OR_NULL(obj)) {
p_err("failed to open object file");
goto err_free_reuse_maps;
}
bpf_object__for_each_program(pos, obj) {
enum bpf_prog_type prog_type = attr.prog_type;
if (attr.prog_type == BPF_PROG_TYPE_UNSPEC) {
const char *sec_name = bpf_program__title(pos, false);
err = libbpf_prog_type_by_name(sec_name, &prog_type,
&expected_attach_type);
if (err < 0) {
p_err("failed to guess program type based on section name %s\n",
sec_name);
goto err_close_obj;
}
}
bpf_program__set_ifindex(pos, ifindex);
bpf_program__set_type(pos, prog_type);
bpf_program__set_expected_attach_type(pos, expected_attach_type);
}
qsort(map_replace, old_map_fds, sizeof(*map_replace),
map_replace_compar);
/* After the sort maps by name will be first on the list, because they
* have idx == -1. Resolve them.
*/
j = 0;
while (j < old_map_fds && map_replace[j].name) {
i = 0;
bpf_map__for_each(map, obj) {
if (!strcmp(bpf_map__name(map), map_replace[j].name)) {
map_replace[j].idx = i;
break;
}
i++;
}
if (map_replace[j].idx == -1) {
p_err("unable to find map '%s'", map_replace[j].name);
goto err_close_obj;
}
j++;
}
/* Resort if any names were resolved */
if (j)
qsort(map_replace, old_map_fds, sizeof(*map_replace),
map_replace_compar);
/* Set ifindex and name reuse */
j = 0;
idx = 0;
bpf_map__for_each(map, obj) {
if (!bpf_map__is_offload_neutral(map))
bpf_map__set_ifindex(map, ifindex);
if (j < old_map_fds && idx == map_replace[j].idx) {
err = bpf_map__reuse_fd(map, map_replace[j++].fd);
if (err) {
p_err("unable to set up map reuse: %d", err);
goto err_close_obj;
}
/* Next reuse wants to apply to the same map */
if (j < old_map_fds && map_replace[j].idx == idx) {
p_err("replacement for map idx %d specified more than once",
idx);
goto err_close_obj;
}
}
idx++;
}
if (j < old_map_fds) {
p_err("map idx '%d' not used", map_replace[j].idx);
goto err_close_obj;
}
set_max_rlimit();
err = bpf_object__load(obj);
if (err) {
p_err("failed to load object file");
goto err_close_obj;
}
err = mount_bpffs_for_pin(pinfile);
if (err)
goto err_close_obj;
if (first_prog_only) {
prog = bpf_program__next(NULL, obj);
if (!prog) {
p_err("object file doesn't contain any bpf program");
goto err_close_obj;
}
err = bpf_obj_pin(bpf_program__fd(prog), pinfile);
if (err) {
p_err("failed to pin program %s",
bpf_program__title(prog, false));
goto err_close_obj;
}
} else {
err = bpf_object__pin_programs(obj, pinfile);
if (err) {
p_err("failed to pin all programs");
goto err_close_obj;
}
}
if (pinmaps) {
err = bpf_object__pin_maps(obj, pinmaps);
if (err) {
p_err("failed to pin all maps");
goto err_unpin;
}
}
if (json_output)
jsonw_null(json_wtr);
bpf_object__close(obj);
for (i = 0; i < old_map_fds; i++)
close(map_replace[i].fd);
free(map_replace);
return 0;
err_unpin:
if (first_prog_only)
unlink(pinfile);
else
bpf_object__unpin_programs(obj, pinfile);
err_close_obj:
bpf_object__close(obj);
err_free_reuse_maps:
for (i = 0; i < old_map_fds; i++)
close(map_replace[i].fd);
free(map_replace);
return -1;
}
static int do_load(int argc, char **argv)
{
return load_with_options(argc, argv, true);
}
static int do_loadall(int argc, char **argv)
{
return load_with_options(argc, argv, false);
}
static int do_help(int argc, char **argv)
{
if (json_output) {
jsonw_null(json_wtr);
return 0;
}
fprintf(stderr,
"Usage: %s %s { show | list } [PROG]\n"
" %s %s dump xlated PROG [{ file FILE | opcodes | visual }]\n"
" %s %s dump jited PROG [{ file FILE | opcodes }]\n"
" %s %s pin PROG FILE\n"
" %s %s { load | loadall } OBJ PATH \\\n"
" [type TYPE] [dev NAME] \\\n"
" [map { idx IDX | name NAME } MAP]\\\n"
" [pinmaps MAP_DIR]\n"
" %s %s attach PROG ATTACH_TYPE [MAP]\n"
" %s %s detach PROG ATTACH_TYPE [MAP]\n"
" %s %s help\n"
"\n"
" " HELP_SPEC_MAP "\n"
" " HELP_SPEC_PROGRAM "\n"
" TYPE := { socket | kprobe | kretprobe | classifier | action |\n"
" tracepoint | raw_tracepoint | xdp | perf_event | cgroup/skb |\n"
" cgroup/sock | cgroup/dev | lwt_in | lwt_out | lwt_xmit |\n"
" lwt_seg6local | sockops | sk_skb | sk_msg | lirc_mode2 |\n"
" cgroup/bind4 | cgroup/bind6 | cgroup/post_bind4 |\n"
" cgroup/post_bind6 | cgroup/connect4 | cgroup/connect6 |\n"
" cgroup/sendmsg4 | cgroup/sendmsg6 }\n"
" ATTACH_TYPE := { msg_verdict | skb_verdict | skb_parse |\n"
" flow_dissector }\n"
" " HELP_SPEC_OPTIONS "\n"
"",
bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
bin_name, argv[-2], bin_name, argv[-2]);
return 0;
}
static const struct cmd cmds[] = {
{ "show", do_show },
{ "list", do_show },
{ "help", do_help },
{ "dump", do_dump },
{ "pin", do_pin },
{ "load", do_load },
{ "loadall", do_loadall },
{ "attach", do_attach },
{ "detach", do_detach },
{ 0 }
};
int do_prog(int argc, char **argv)
{
return cmd_select(cmds, argc, argv, do_help);
}
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