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tools: bpftool: add JSON output for `bpftool prog show *` command 

Reuse the json_writer API introduced in an earlier commit to make
bpftool able to generate JSON output on `bpftool prog show *` commands.

For readability, the code from show_prog() has been split into two
functions, one for plain output, one for JSON.

Outputs from sample programs have been successfully tested against a
JSON validator.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Quentin Monnet 2017-10-23 09:24:08 -07:00 committed by David S. Miller
parent d35efba99d
commit 743cc665d5
1 changed files with 111 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

147
tools/bpf/bpftool/prog.c
View File

@ -195,51 +195,100 @@ static void show_prog_maps(int fd, u32 num_maps)
if (err || !info.nr_map_ids)
return;
printf(" map_ids ");
for (i = 0; i < info.nr_map_ids; i++)
printf("%u%s", map_ids[i],
i == info.nr_map_ids - 1 ? "" : ",");
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 int show_prog(int fd)
static void print_prog_json(struct bpf_prog_info *info, int fd)
{
struct bpf_prog_info info = {};
__u32 len = sizeof(info);
char *memlock;
int err;
err = bpf_obj_get_info_by_fd(fd, &info, &len);
if (err) {
err("can't get prog info: %s\n", strerror(errno));
return -1;
}
printf("%u: ", info.id);
if (info.type < ARRAY_SIZE(prog_type_name))
printf("%s ", prog_type_name[info.type]);
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
printf("type %u ", info.type);
jsonw_uint_field(json_wtr, "type", info->type);
if (*info.name)
printf("name %s ", info.name);
if (*info->name)
jsonw_string_field(json_wtr, "name", info->name);
printf("tag ");
fprint_hex(stdout, info.tag, BPF_TAG_SIZE, "");
printf("\n");
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]);
if (info.load_time) {
if (info->load_time) {
char buf[32];
print_boot_time(info.load_time, buf, sizeof(buf));
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);
jsonw_string_field(json_wtr, "loaded_at", buf);
jsonw_uint_field(json_wtr, "uid", info->created_by_uid);
}
printf("\txlated %uB", info.xlated_prog_len);
jsonw_uint_field(json_wtr, "bytes_xlated", info->xlated_prog_len);
if (info.jited_prog_len)
printf(" jited %uB", info.jited_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);
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, "");
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");
@ -248,16 +297,35 @@ static int show_prog(int fd)
printf(" memlock %sB", memlock);
free(memlock);
if (info.nr_map_ids)
show_prog_maps(fd, info.nr_map_ids);
if (info->nr_map_ids)
show_prog_maps(fd, info->nr_map_ids);
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) {
err("can't get prog info: %s\n", 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;
{
__u32 id = 0;
int err;
int fd;
@ -272,6 +340,8 @@ static int do_show(int argc, char **argv)
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) {
@ -282,23 +352,28 @@ static int do_show(int argc, char **argv)
err("can't get next program: %s\n", strerror(errno));
if (errno == EINVAL)
err("kernel too old?\n");
return -1;
err = -1;
break;
}
fd = bpf_prog_get_fd_by_id(id);
if (fd < 0) {
err("can't get prog by id (%u): %s\n",
id, strerror(errno));
return -1;
err = -1;
break;
}
err = show_prog(fd);
close(fd);
if (err)
return err;
break;
}
return 0;
if (json_output)
jsonw_end_array(json_wtr);
return err;
}
static void print_insn(struct bpf_verifier_env *env, const char *fmt, ...)