Commit f12b6543 authored by Andrii Nakryiko's avatar Andrii Nakryiko Committed by Alexei Starovoitov
Browse files

libbpf: Streamline error reporting for low-level APIs 

Ensure that low-level APIs behave uniformly across the libbpf as follows:
  - in case of an error, errno is always set to the correct error code;
  - when libbpf 1.0 mode is enabled with LIBBPF_STRICT_DIRECT_ERRS option to
    libbpf_set_strict_mode(), return -Exxx error value directly, instead of -1;
  - by default, until libbpf 1.0 is released, keep returning -1 directly.

More context, justification, and discussion can be found in "Libbpf: the road
to v1.0" document ([0]).

  [0] https://docs.google.com/document/d/1UyjTZuPFWiPFyKk1tV5an11_iaRuec6U-ZESZ54nNTY



Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarJohn Fastabend <john.fastabend@gmail.com>
Acked-by: default avatarToke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/bpf/20210525035935.1461796-4-andrii@kernel.org
parent bad2e478

tools/lib/bpf/bpf.c

+118 −50
Original line number Diff line number Diff line
@@ -80,6 +80,7 @@ static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size) 
int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr)

{

	union bpf_attr attr;

	int fd;



	memset(&attr, '\0', sizeof(attr));
@@ -102,7 +103,8 @@ int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr) 
	else

		attr.inner_map_fd = create_attr->inner_map_fd;



	return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));

	fd = sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));

	return libbpf_err_errno(fd);

}



int bpf_create_map_node(enum bpf_map_type map_type, const char *name,
@@ -160,6 +162,7 @@ int bpf_create_map_in_map_node(enum bpf_map_type map_type, const char *name, 
			       __u32 map_flags, int node)

{

	union bpf_attr attr;

	int fd;



	memset(&attr, '\0', sizeof(attr));
@@ -178,7 +181,8 @@ int bpf_create_map_in_map_node(enum bpf_map_type map_type, const char *name, 
		attr.numa_node = node;

	}



	return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));

	fd = sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));

	return libbpf_err_errno(fd);

}



int bpf_create_map_in_map(enum bpf_map_type map_type, const char *name,
@@ -222,10 +226,10 @@ int libbpf__bpf_prog_load(const struct bpf_prog_load_params *load_attr) 
	int fd;



	if (!load_attr->log_buf != !load_attr->log_buf_sz)

		return -EINVAL;

		return libbpf_err(-EINVAL);



	if (load_attr->log_level > (4 | 2 | 1) || (load_attr->log_level && !load_attr->log_buf))

		return -EINVAL;

		return libbpf_err(-EINVAL);



	memset(&attr, 0, sizeof(attr));

	attr.prog_type = load_attr->prog_type;
@@ -281,8 +285,10 @@ int libbpf__bpf_prog_load(const struct bpf_prog_load_params *load_attr) 
							load_attr->func_info_cnt,

							load_attr->func_info_rec_size,

							attr.func_info_rec_size);

			if (!finfo)

			if (!finfo) {

				errno = E2BIG;

				goto done;

			}



			attr.func_info = ptr_to_u64(finfo);

			attr.func_info_rec_size = load_attr->func_info_rec_size;
@@ -293,8 +299,10 @@ int libbpf__bpf_prog_load(const struct bpf_prog_load_params *load_attr) 
							load_attr->line_info_cnt,

							load_attr->line_info_rec_size,

							attr.line_info_rec_size);

			if (!linfo)

			if (!linfo) {

				errno = E2BIG;

				goto done;

			}



			attr.line_info = ptr_to_u64(linfo);

			attr.line_info_rec_size = load_attr->line_info_rec_size;
@@ -318,9 +326,10 @@ int libbpf__bpf_prog_load(const struct bpf_prog_load_params *load_attr) 


	fd = sys_bpf_prog_load(&attr, sizeof(attr));

done:

	/* free() doesn't affect errno, so we don't need to restore it */

	free(finfo);

	free(linfo);

	return fd;

	return libbpf_err_errno(fd);

}



int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
@@ -329,7 +338,7 @@ int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr, 
	struct bpf_prog_load_params p = {};



	if (!load_attr || !log_buf != !log_buf_sz)

		return -EINVAL;

		return libbpf_err(-EINVAL);



	p.prog_type = load_attr->prog_type;

	p.expected_attach_type = load_attr->expected_attach_type;
@@ -391,6 +400,7 @@ int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns, 
		       int log_level)

{

	union bpf_attr attr;

	int fd;



	memset(&attr, 0, sizeof(attr));

	attr.prog_type = type;
@@ -404,13 +414,15 @@ int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns, 
	attr.kern_version = kern_version;

	attr.prog_flags = prog_flags;



	return sys_bpf_prog_load(&attr, sizeof(attr));

	fd = sys_bpf_prog_load(&attr, sizeof(attr));

	return libbpf_err_errno(fd);

}



int bpf_map_update_elem(int fd, const void *key, const void *value,

			__u64 flags)

{

	union bpf_attr attr;

	int ret;



	memset(&attr, 0, sizeof(attr));

	attr.map_fd = fd;
@@ -418,24 +430,28 @@ int bpf_map_update_elem(int fd, const void *key, const void *value, 
	attr.value = ptr_to_u64(value);

	attr.flags = flags;



	return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));

	ret = sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));

	return libbpf_err_errno(ret);

}



int bpf_map_lookup_elem(int fd, const void *key, void *value)

{

	union bpf_attr attr;

	int ret;



	memset(&attr, 0, sizeof(attr));

	attr.map_fd = fd;

	attr.key = ptr_to_u64(key);

	attr.value = ptr_to_u64(value);



	return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));

	ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));

	return libbpf_err_errno(ret);

}



int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags)

{

	union bpf_attr attr;

	int ret;



	memset(&attr, 0, sizeof(attr));

	attr.map_fd = fd;
@@ -443,19 +459,22 @@ int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags) 
	attr.value = ptr_to_u64(value);

	attr.flags = flags;



	return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));

	ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));

	return libbpf_err_errno(ret);

}



int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value)

{

	union bpf_attr attr;

	int ret;



	memset(&attr, 0, sizeof(attr));

	attr.map_fd = fd;

	attr.key = ptr_to_u64(key);

	attr.value = ptr_to_u64(value);



	return sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr));

	ret = sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr));

	return libbpf_err_errno(ret);

}



int bpf_map_lookup_and_delete_elem_flags(int fd, const void *key, void *value, __u64 flags)
@@ -474,34 +493,40 @@ int bpf_map_lookup_and_delete_elem_flags(int fd, const void *key, void *value, _ 
int bpf_map_delete_elem(int fd, const void *key)

{

	union bpf_attr attr;

	int ret;



	memset(&attr, 0, sizeof(attr));

	attr.map_fd = fd;

	attr.key = ptr_to_u64(key);



	return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));

	ret = sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));

	return libbpf_err_errno(ret);

}



int bpf_map_get_next_key(int fd, const void *key, void *next_key)

{

	union bpf_attr attr;

	int ret;



	memset(&attr, 0, sizeof(attr));

	attr.map_fd = fd;

	attr.key = ptr_to_u64(key);

	attr.next_key = ptr_to_u64(next_key);



	return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));

	ret = sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));

	return libbpf_err_errno(ret);

}



int bpf_map_freeze(int fd)

{

	union bpf_attr attr;

	int ret;



	memset(&attr, 0, sizeof(attr));

	attr.map_fd = fd;



	return sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr));

	ret = sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr));

	return libbpf_err_errno(ret);

}



static int bpf_map_batch_common(int cmd, int fd, void  *in_batch,
@@ -513,7 +538,7 @@ static int bpf_map_batch_common(int cmd, int fd, void *in_batch, 
	int ret;



	if (!OPTS_VALID(opts, bpf_map_batch_opts))

		return -EINVAL;

		return libbpf_err(-EINVAL);



	memset(&attr, 0, sizeof(attr));

	attr.batch.map_fd = fd;
@@ -528,7 +553,7 @@ static int bpf_map_batch_common(int cmd, int fd, void *in_batch, 
	ret = sys_bpf(cmd, &attr, sizeof(attr));

	*count = attr.batch.count;



	return ret;

	return libbpf_err_errno(ret);

}



int bpf_map_delete_batch(int fd, void *keys, __u32 *count,
@@ -565,22 +590,26 @@ int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count, 
int bpf_obj_pin(int fd, const char *pathname)

{

	union bpf_attr attr;

	int ret;



	memset(&attr, 0, sizeof(attr));

	attr.pathname = ptr_to_u64((void *)pathname);

	attr.bpf_fd = fd;



	return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr));

	ret = sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr));

	return libbpf_err_errno(ret);

}



int bpf_obj_get(const char *pathname)

{

	union bpf_attr attr;

	int fd;



	memset(&attr, 0, sizeof(attr));

	attr.pathname = ptr_to_u64((void *)pathname);



	return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));

	fd = sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));

	return libbpf_err_errno(fd);

}



int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
@@ -598,9 +627,10 @@ int bpf_prog_attach_xattr(int prog_fd, int target_fd, 
			  const struct bpf_prog_attach_opts *opts)

{

	union bpf_attr attr;

	int ret;



	if (!OPTS_VALID(opts, bpf_prog_attach_opts))

		return -EINVAL;

		return libbpf_err(-EINVAL);



	memset(&attr, 0, sizeof(attr));

	attr.target_fd	   = target_fd;
@@ -609,30 +639,35 @@ int bpf_prog_attach_xattr(int prog_fd, int target_fd, 
	attr.attach_flags  = OPTS_GET(opts, flags, 0);

	attr.replace_bpf_fd = OPTS_GET(opts, replace_prog_fd, 0);



	return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));

	ret = sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));

	return libbpf_err_errno(ret);

}



int bpf_prog_detach(int target_fd, enum bpf_attach_type type)

{

	union bpf_attr attr;

	int ret;



	memset(&attr, 0, sizeof(attr));

	attr.target_fd	 = target_fd;

	attr.attach_type = type;



	return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));

	ret = sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));

	return libbpf_err_errno(ret);

}



int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type)

{

	union bpf_attr attr;

	int ret;



	memset(&attr, 0, sizeof(attr));

	attr.target_fd	 = target_fd;

	attr.attach_bpf_fd = prog_fd;

	attr.attach_type = type;



	return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));

	ret = sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));

	return libbpf_err_errno(ret);

}



int bpf_link_create(int prog_fd, int target_fd,
@@ -641,15 +676,16 @@ int bpf_link_create(int prog_fd, int target_fd, 
{

	__u32 target_btf_id, iter_info_len;

	union bpf_attr attr;

	int fd;



	if (!OPTS_VALID(opts, bpf_link_create_opts))

		return -EINVAL;

		return libbpf_err(-EINVAL);



	iter_info_len = OPTS_GET(opts, iter_info_len, 0);

	target_btf_id = OPTS_GET(opts, target_btf_id, 0);



	if (iter_info_len && target_btf_id)

		return -EINVAL;

		return libbpf_err(-EINVAL);



	memset(&attr, 0, sizeof(attr));

	attr.link_create.prog_fd = prog_fd;
@@ -665,26 +701,30 @@ int bpf_link_create(int prog_fd, int target_fd, 
		attr.link_create.target_btf_id = target_btf_id;

	}



	return sys_bpf(BPF_LINK_CREATE, &attr, sizeof(attr));

	fd = sys_bpf(BPF_LINK_CREATE, &attr, sizeof(attr));

	return libbpf_err_errno(fd);

}



int bpf_link_detach(int link_fd)

{

	union bpf_attr attr;

	int ret;



	memset(&attr, 0, sizeof(attr));

	attr.link_detach.link_fd = link_fd;



	return sys_bpf(BPF_LINK_DETACH, &attr, sizeof(attr));

	ret = sys_bpf(BPF_LINK_DETACH, &attr, sizeof(attr));

	return libbpf_err_errno(ret);

}



int bpf_link_update(int link_fd, int new_prog_fd,

		    const struct bpf_link_update_opts *opts)

{

	union bpf_attr attr;

	int ret;



	if (!OPTS_VALID(opts, bpf_link_update_opts))

		return -EINVAL;

		return libbpf_err(-EINVAL);



	memset(&attr, 0, sizeof(attr));

	attr.link_update.link_fd = link_fd;
@@ -692,17 +732,20 @@ int bpf_link_update(int link_fd, int new_prog_fd, 
	attr.link_update.flags = OPTS_GET(opts, flags, 0);

	attr.link_update.old_prog_fd = OPTS_GET(opts, old_prog_fd, 0);



	return sys_bpf(BPF_LINK_UPDATE, &attr, sizeof(attr));

	ret = sys_bpf(BPF_LINK_UPDATE, &attr, sizeof(attr));

	return libbpf_err_errno(ret);

}



int bpf_iter_create(int link_fd)

{

	union bpf_attr attr;

	int fd;



	memset(&attr, 0, sizeof(attr));

	attr.iter_create.link_fd = link_fd;



	return sys_bpf(BPF_ITER_CREATE, &attr, sizeof(attr));

	fd = sys_bpf(BPF_ITER_CREATE, &attr, sizeof(attr));

	return libbpf_err_errno(fd);

}



int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags,
@@ -719,10 +762,12 @@ int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags, 
	attr.query.prog_ids	= ptr_to_u64(prog_ids);



	ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr));



	if (attach_flags)

		*attach_flags = attr.query.attach_flags;

	*prog_cnt = attr.query.prog_cnt;

	return ret;



	return libbpf_err_errno(ret);

}



int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size,
@@ -740,13 +785,15 @@ int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size, 
	attr.test.repeat = repeat;



	ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));



	if (size_out)

		*size_out = attr.test.data_size_out;

	if (retval)

		*retval = attr.test.retval;

	if (duration)

		*duration = attr.test.duration;

	return ret;



	return libbpf_err_errno(ret);

}



int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr)
@@ -755,7 +802,7 @@ int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr) 
	int ret;



	if (!test_attr->data_out && test_attr->data_size_out > 0)

		return -EINVAL;

		return libbpf_err(-EINVAL);



	memset(&attr, 0, sizeof(attr));

	attr.test.prog_fd = test_attr->prog_fd;
@@ -770,11 +817,13 @@ int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr) 
	attr.test.repeat = test_attr->repeat;



	ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));



	test_attr->data_size_out = attr.test.data_size_out;

	test_attr->ctx_size_out = attr.test.ctx_size_out;

	test_attr->retval = attr.test.retval;

	test_attr->duration = attr.test.duration;

	return ret;



	return libbpf_err_errno(ret);

}



int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts)
@@ -783,7 +832,7 @@ int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts) 
	int ret;



	if (!OPTS_VALID(opts, bpf_test_run_opts))

		return -EINVAL;

		return libbpf_err(-EINVAL);



	memset(&attr, 0, sizeof(attr));

	attr.test.prog_fd = prog_fd;
@@ -801,11 +850,13 @@ int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts) 
	attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL));



	ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));



	OPTS_SET(opts, data_size_out, attr.test.data_size_out);

	OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out);

	OPTS_SET(opts, duration, attr.test.duration);

	OPTS_SET(opts, retval, attr.test.retval);

	return ret;



	return libbpf_err_errno(ret);

}



static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd)
@@ -820,7 +871,7 @@ static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd) 
	if (!err)

		*next_id = attr.next_id;



	return err;

	return libbpf_err_errno(err);

}



int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id)
@@ -846,41 +897,49 @@ int bpf_link_get_next_id(__u32 start_id, __u32 *next_id) 
int bpf_prog_get_fd_by_id(__u32 id)

{

	union bpf_attr attr;

	int fd;



	memset(&attr, 0, sizeof(attr));

	attr.prog_id = id;



	return sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr));

	fd = sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr));

	return libbpf_err_errno(fd);

}



int bpf_map_get_fd_by_id(__u32 id)

{

	union bpf_attr attr;

	int fd;



	memset(&attr, 0, sizeof(attr));

	attr.map_id = id;



	return sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr));

	fd = sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr));

	return libbpf_err_errno(fd);

}



int bpf_btf_get_fd_by_id(__u32 id)

{

	union bpf_attr attr;

	int fd;



	memset(&attr, 0, sizeof(attr));

	attr.btf_id = id;



	return sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr));

	fd = sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr));

	return libbpf_err_errno(fd);

}



int bpf_link_get_fd_by_id(__u32 id)

{

	union bpf_attr attr;

	int fd;



	memset(&attr, 0, sizeof(attr));

	attr.link_id = id;



	return sys_bpf(BPF_LINK_GET_FD_BY_ID, &attr, sizeof(attr));

	fd = sys_bpf(BPF_LINK_GET_FD_BY_ID, &attr, sizeof(attr));

	return libbpf_err_errno(fd);

}



int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len)
@@ -894,21 +953,24 @@ int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len) 
	attr.info.info = ptr_to_u64(info);



	err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr));



	if (!err)

		*info_len = attr.info.info_len;



	return err;

	return libbpf_err_errno(err);

}



int bpf_raw_tracepoint_open(const char *name, int prog_fd)

{

	union bpf_attr attr;

	int fd;



	memset(&attr, 0, sizeof(attr));

	attr.raw_tracepoint.name = ptr_to_u64(name);

	attr.raw_tracepoint.prog_fd = prog_fd;



	return sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr));

	fd = sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr));

	return libbpf_err_errno(fd);

}



int bpf_load_btf(const void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size,
@@ -928,12 +990,13 @@ int bpf_load_btf(const void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_s 
	}



	fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr));

	if (fd == -1 && !do_log && log_buf && log_buf_size) {



	if (fd < 0 && !do_log && log_buf && log_buf_size) {

		do_log = true;

		goto retry;

	}



	return fd;

	return libbpf_err_errno(fd);

}



int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len,
@@ -950,37 +1013,42 @@ int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len, 
	attr.task_fd_query.buf_len = *buf_len;



	err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr));



	*buf_len = attr.task_fd_query.buf_len;

	*prog_id = attr.task_fd_query.prog_id;

	*fd_type = attr.task_fd_query.fd_type;

	*probe_offset = attr.task_fd_query.probe_offset;

	*probe_addr = attr.task_fd_query.probe_addr;



	return err;

	return libbpf_err_errno(err);

}



int bpf_enable_stats(enum bpf_stats_type type)

{

	union bpf_attr attr;

	int fd;



	memset(&attr, 0, sizeof(attr));

	attr.enable_stats.type = type;



	return sys_bpf(BPF_ENABLE_STATS, &attr, sizeof(attr));

	fd = sys_bpf(BPF_ENABLE_STATS, &attr, sizeof(attr));

	return libbpf_err_errno(fd);

}



int bpf_prog_bind_map(int prog_fd, int map_fd,

		      const struct bpf_prog_bind_opts *opts)

{

	union bpf_attr attr;

	int ret;



	if (!OPTS_VALID(opts, bpf_prog_bind_opts))

		return -EINVAL;

		return libbpf_err(-EINVAL);



	memset(&attr, 0, sizeof(attr));

	attr.prog_bind_map.prog_fd = prog_fd;

	attr.prog_bind_map.map_fd = map_fd;

	attr.prog_bind_map.flags = OPTS_GET(opts, flags, 0);



	return sys_bpf(BPF_PROG_BIND_MAP, &attr, sizeof(attr));

	ret = sys_bpf(BPF_PROG_BIND_MAP, &attr, sizeof(attr));

	return libbpf_err_errno(ret);

}

tools/lib/bpf/libbpf_internal.h

+26 −0
Original line number Diff line number Diff line
@@ -11,6 +11,9 @@ 


#include <stdlib.h>

#include <limits.h>

#include <errno.h>

#include <linux/err.h>

#include "libbpf_legacy.h"



/* make sure libbpf doesn't use kernel-only integer typedefs */

#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
@@ -436,4 +439,27 @@ int btf_type_visit_str_offs(struct btf_type *t, str_off_visit_fn visit, void *ct 
int btf_ext_visit_type_ids(struct btf_ext *btf_ext, type_id_visit_fn visit, void *ctx);

int btf_ext_visit_str_offs(struct btf_ext *btf_ext, str_off_visit_fn visit, void *ctx);



extern enum libbpf_strict_mode libbpf_mode;



/* handle direct returned errors */

static inline int libbpf_err(int ret)

{

	if (ret < 0)

		errno = -ret;

	return ret;

}



/* handle errno-based (e.g., syscall or libc) errors according to libbpf's

 * strict mode settings

 */

static inline int libbpf_err_errno(int ret)

{

	if (libbpf_mode & LIBBPF_STRICT_DIRECT_ERRS)

		/* errno is already assumed to be set on error */

		return ret < 0 ? -errno : ret;



	/* legacy: on error return -1 directly and don't touch errno */

	return ret;

}



#endif /* __LIBBPF_LIBBPF_INTERNAL_H */

tools/lib/bpf/libbpf_legacy.h

+12 −0
Original line number Diff line number Diff line
@@ -33,6 +33,18 @@ enum libbpf_strict_mode { 
	 * code so that it handles LIBBPF_STRICT_ALL mode before libbpf v1.0.

	 */

	LIBBPF_STRICT_NONE = 0x00,

	/*

	 * Return NULL pointers on error, not ERR_PTR(err).

	 * Additionally, libbpf also always sets errno to corresponding Exx

	 * (positive) error code.

	 */

	LIBBPF_STRICT_CLEAN_PTRS = 0x01,

	/*

	 * Return actual error codes from low-level APIs directly, not just -1.

	 * Additionally, libbpf also always sets errno to corresponding Exx

	 * (positive) error code.

	 */

	LIBBPF_STRICT_DIRECT_ERRS = 0x02,



	__LIBBPF_STRICT_LAST,

};