bpftool: Use bpf_{btf,link,map,prog}_get_info_by_fd()

Use the new type-safe wrappers around bpf_obj_get_info_by_fd().

Split the bpf_obj_get_info_by_fd() call in build_btf_type_table() in
two, since knowing the type helps with the Memory Sanitizer.

Improve map_parse_fd_and_info() type safety by using
struct bpf_map_info * instead of void * for info.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20230214231221.249277-4-iii@linux.ibm.com

tools/bpf/bpftool/btf.c

@@ -537,7 +537,7 @@ static bool btf_is_kernel_module(__u32 btf_id)
 	len = sizeof(btf_info);
 	btf_info.name = ptr_to_u64(btf_name);
 	btf_info.name_len = sizeof(btf_name);
-	err = bpf_obj_get_info_by_fd(btf_fd, &btf_info, &len);
+	err = bpf_btf_get_info_by_fd(btf_fd, &btf_info, &len);
 	close(btf_fd);
 	if (err) {
 		p_err("can't get BTF (ID %u) object info: %s", btf_id, strerror(errno));
@@ -606,7 +606,7 @@ static int do_dump(int argc, char **argv)
 		if (fd < 0)
 			return -1;
 
-		err = bpf_obj_get_info_by_fd(fd, &info, &len);
+		err = bpf_prog_get_info_by_fd(fd, &info, &len);
 		if (err) {
 			p_err("can't get prog info: %s", strerror(errno));
 			goto done;
@@ -789,7 +789,10 @@ build_btf_type_table(struct hashmap *tab, enum bpf_obj_type type,
 		}
 
 		memset(info, 0, *len);
-		err = bpf_obj_get_info_by_fd(fd, info, len);
+		if (type == BPF_OBJ_PROG)
+			err = bpf_prog_get_info_by_fd(fd, info, len);
+		else
+			err = bpf_map_get_info_by_fd(fd, info, len);
 		close(fd);
 		if (err) {
 			p_err("can't get %s info: %s", names[type],
@@ -931,7 +934,7 @@ show_btf(int fd, struct hashmap *btf_prog_table,
 	int err;
 
 	memset(&info, 0, sizeof(info));
-	err = bpf_obj_get_info_by_fd(fd, &info, &len);
+	err = bpf_btf_get_info_by_fd(fd, &info, &len);
 	if (err) {
 		p_err("can't get BTF object info: %s", strerror(errno));
 		return -1;
@@ -943,7 +946,7 @@ show_btf(int fd, struct hashmap *btf_prog_table,
 		info.name = ptr_to_u64(name);
 		len = sizeof(info);
 
-		err = bpf_obj_get_info_by_fd(fd, &info, &len);
+		err = bpf_btf_get_info_by_fd(fd, &info, &len);
 		if (err) {
 			p_err("can't get BTF object info: %s", strerror(errno));
 			return -1;

tools/bpf/bpftool/btf_dumper.c

@@ -57,7 +57,7 @@ static int dump_prog_id_as_func_ptr(const struct btf_dumper *d,
 	if (prog_fd < 0)
 		goto print;
 
-	err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+	err = bpf_prog_get_info_by_fd(prog_fd, &info, &info_len);
 	if (err)
 		goto print;
 
@@ -70,7 +70,7 @@ static int dump_prog_id_as_func_ptr(const struct btf_dumper *d,
 	info.func_info_rec_size = finfo_rec_size;
 	info.func_info = ptr_to_u64(&finfo);
 
-	err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+	err = bpf_prog_get_info_by_fd(prog_fd, &info, &info_len);
 	if (err)
 		goto print;
 

tools/bpf/bpftool/cgroup.c

@@ -82,7 +82,7 @@ static void guess_vmlinux_btf_id(__u32 attach_btf_obj_id)
 	if (fd < 0)
 		return;
 
-	err = bpf_obj_get_info_by_fd(fd, &btf_info, &btf_len);
+	err = bpf_btf_get_info_by_fd(fd, &btf_info, &btf_len);
 	if (err)
 		goto out;
 
@@ -108,7 +108,7 @@ static int show_bpf_prog(int id, enum bpf_attach_type attach_type,
 	if (prog_fd < 0)
 		return -1;
 
-	if (bpf_obj_get_info_by_fd(prog_fd, &info, &info_len)) {
+	if (bpf_prog_get_info_by_fd(prog_fd, &info, &info_len)) {
 		close(prog_fd);
 		return -1;
 	}

tools/bpf/bpftool/common.c

@@ -353,7 +353,7 @@ void get_prog_full_name(const struct bpf_prog_info *prog_info, int prog_fd,
 		info.func_info_rec_size = sizeof(finfo);
 	info.func_info = ptr_to_u64(&finfo);
 
-	if (bpf_obj_get_info_by_fd(prog_fd, &info, &info_len))
+	if (bpf_prog_get_info_by_fd(prog_fd, &info, &info_len))
 		goto copy_name;
 
 	prog_btf = btf__load_from_kernel_by_id(info.btf_id);
@@ -488,7 +488,7 @@ static int do_build_table_cb(const char *fpath, const struct stat *sb,
 		goto out_close;
 
 	memset(&pinned_info, 0, sizeof(pinned_info));
-	if (bpf_obj_get_info_by_fd(fd, &pinned_info, &len))
+	if (bpf_prog_get_info_by_fd(fd, &pinned_info, &len))
 		goto out_close;
 
 	path = strdup(fpath);
@@ -756,7 +756,7 @@ static int prog_fd_by_nametag(void *nametag, int **fds, bool tag)
 			goto err_close_fds;
 		}
 
-		err = bpf_obj_get_info_by_fd(fd, &info, &len);
+		err = bpf_prog_get_info_by_fd(fd, &info, &len);
 		if (err) {
 			p_err("can't get prog info (%u): %s",
 			      id, strerror(errno));
@@ -916,7 +916,7 @@ static int map_fd_by_name(char *name, int **fds)
 			goto err_close_fds;
 		}
 
-		err = bpf_obj_get_info_by_fd(fd, &info, &len);
+		err = bpf_map_get_info_by_fd(fd, &info, &len);
 		if (err) {
 			p_err("can't get map info (%u): %s",
 			      id, strerror(errno));
@@ -1026,7 +1026,8 @@ int map_parse_fd(int *argc, char ***argv)
 	return fd;
 }
 
-int map_parse_fd_and_info(int *argc, char ***argv, void *info, __u32 *info_len)
+int map_parse_fd_and_info(int *argc, char ***argv, struct bpf_map_info *info,
+			  __u32 *info_len)
 {
 	int err;
 	int fd;
@@ -1035,7 +1036,7 @@ int map_parse_fd_and_info(int *argc, char ***argv, void *info, __u32 *info_len)
 	if (fd < 0)
 		return -1;
 
-	err = bpf_obj_get_info_by_fd(fd, info, info_len);
+	err = bpf_map_get_info_by_fd(fd, info, info_len);
 	if (err) {
 		p_err("can't get map info: %s", strerror(errno));
 		close(fd);

tools/bpf/bpftool/link.c

@@ -145,7 +145,7 @@ static int get_prog_info(int prog_id, struct bpf_prog_info *info)
 		return prog_fd;
 
 	memset(info, 0, sizeof(*info));
-	err = bpf_obj_get_info_by_fd(prog_fd, info, &len);
+	err = bpf_prog_get_info_by_fd(prog_fd, info, &len);
 	if (err)
 		p_err("can't get prog info: %s", strerror(errno));
 	close(prog_fd);
@@ -327,7 +327,7 @@ static int do_show_link(int fd)
 
 	memset(&info, 0, sizeof(info));
 again:
-	err = bpf_obj_get_info_by_fd(fd, &info, &len);
+	err = bpf_link_get_info_by_fd(fd, &info, &len);
 	if (err) {
 		p_err("can't get link info: %s",
 		      strerror(errno));

tools/bpf/bpftool/main.h

@@ -168,7 +168,8 @@ int prog_parse_fd(int *argc, char ***argv);
 int prog_parse_fds(int *argc, char ***argv, int **fds);
 int map_parse_fd(int *argc, char ***argv);
 int map_parse_fds(int *argc, char ***argv, int **fds);
-int map_parse_fd_and_info(int *argc, char ***argv, void *info, __u32 *info_len);
+int map_parse_fd_and_info(int *argc, char ***argv, struct bpf_map_info *info,
+			  __u32 *info_len);
 
 struct bpf_prog_linfo;
 #if defined(HAVE_LLVM_SUPPORT) || defined(HAVE_LIBBFD_SUPPORT)

tools/bpf/bpftool/map.c

@@ -638,7 +638,7 @@ static int do_show_subset(int argc, char **argv)
 	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);
+		err = bpf_map_get_info_by_fd(fds[i], &info, &len);
 		if (err) {
 			p_err("can't get map info: %s",
 			      strerror(errno));
@@ -708,7 +708,7 @@ static int do_show(int argc, char **argv)
 			break;
 		}
 
-		err = bpf_obj_get_info_by_fd(fd, &info, &len);
+		err = bpf_map_get_info_by_fd(fd, &info, &len);
 		if (err) {
 			p_err("can't get map info: %s", strerror(errno));
 			close(fd);
@@ -764,7 +764,7 @@ static int maps_have_btf(int *fds, int nb_fds)
 	int err, i;
 
 	for (i = 0; i < nb_fds; i++) {
-		err = bpf_obj_get_info_by_fd(fds[i], &info, &len);
+		err = bpf_map_get_info_by_fd(fds[i], &info, &len);
 		if (err) {
 			p_err("can't get map info: %s", strerror(errno));
 			return -1;
@@ -925,7 +925,7 @@ static int do_dump(int argc, char **argv)
 	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)) {
+		if (bpf_map_get_info_by_fd(fds[i], &info, &len)) {
 			p_err("can't get map info: %s", strerror(errno));
 			break;
 		}

tools/bpf/bpftool/prog.c

@@ -198,7 +198,7 @@ static void show_prog_maps(int fd, __u32 num_maps)
 	info.nr_map_ids = num_maps;
 	info.map_ids = ptr_to_u64(map_ids);
 
-	err = bpf_obj_get_info_by_fd(fd, &info, &len);
+	err = bpf_prog_get_info_by_fd(fd, &info, &len);
 	if (err || !info.nr_map_ids)
 		return;
 
@@ -231,7 +231,7 @@ static void *find_metadata(int prog_fd, struct bpf_map_info *map_info)
 
 	memset(&prog_info, 0, sizeof(prog_info));
 	prog_info_len = sizeof(prog_info);
-	ret = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &prog_info_len);
+	ret = bpf_prog_get_info_by_fd(prog_fd, &prog_info, &prog_info_len);
 	if (ret)
 		return NULL;
 
@@ -248,7 +248,7 @@ static void *find_metadata(int prog_fd, struct bpf_map_info *map_info)
 	prog_info.map_ids = ptr_to_u64(map_ids);
 	prog_info_len = sizeof(prog_info);
 
-	ret = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &prog_info_len);
+	ret = bpf_prog_get_info_by_fd(prog_fd, &prog_info, &prog_info_len);
 	if (ret)
 		goto free_map_ids;
 
@@ -259,7 +259,7 @@ static void *find_metadata(int prog_fd, struct bpf_map_info *map_info)
 
 		memset(map_info, 0, sizeof(*map_info));
 		map_info_len = sizeof(*map_info);
-		ret = bpf_obj_get_info_by_fd(map_fd, map_info, &map_info_len);
+		ret = bpf_map_get_info_by_fd(map_fd, map_info, &map_info_len);
 		if (ret < 0) {
 			close(map_fd);
 			goto free_map_ids;
@@ -580,7 +580,7 @@ static int show_prog(int fd)
 	__u32 len = sizeof(info);
 	int err;
 
-	err = bpf_obj_get_info_by_fd(fd, &info, &len);
+	err = bpf_prog_get_info_by_fd(fd, &info, &len);
 	if (err) {
 		p_err("can't get prog info: %s", strerror(errno));
 		return -1;
@@ -949,7 +949,7 @@ static int do_dump(int argc, char **argv)
 	for (i = 0; i < nb_fds; i++) {
 		memset(&info, 0, sizeof(info));
 
-		err = bpf_obj_get_info_by_fd(fds[i], &info, &info_len);
+		err = bpf_prog_get_info_by_fd(fds[i], &info, &info_len);
 		if (err) {
 			p_err("can't get prog info: %s", strerror(errno));
 			break;
@@ -961,7 +961,7 @@ static int do_dump(int argc, char **argv)
 			break;
 		}
 
-		err = bpf_obj_get_info_by_fd(fds[i], &info, &info_len);
+		err = bpf_prog_get_info_by_fd(fds[i], &info, &info_len);
 		if (err) {
 			p_err("can't get prog info: %s", strerror(errno));
 			break;
@@ -2170,9 +2170,9 @@ static char *profile_target_name(int tgt_fd)
 	char *name = NULL;
 	int err;
 
-	err = bpf_obj_get_info_by_fd(tgt_fd, &info, &info_len);
+	err = bpf_prog_get_info_by_fd(tgt_fd, &info, &info_len);
 	if (err) {
-		p_err("failed to bpf_obj_get_info_by_fd for prog FD %d", tgt_fd);
+		p_err("failed to get info for prog FD %d", tgt_fd);
 		goto out;
 	}
 
@@ -2183,7 +2183,7 @@ static char *profile_target_name(int tgt_fd)
 
 	func_info_rec_size = info.func_info_rec_size;
 	if (info.nr_func_info == 0) {
-		p_err("bpf_obj_get_info_by_fd for prog FD %d found 0 func_info", tgt_fd);
+		p_err("found 0 func_info for prog FD %d", tgt_fd);
 		goto out;
 	}
 
@@ -2192,7 +2192,7 @@ static char *profile_target_name(int tgt_fd)
 	info.func_info_rec_size = func_info_rec_size;
 	info.func_info = ptr_to_u64(&func_info);
 
-	err = bpf_obj_get_info_by_fd(tgt_fd, &info, &info_len);
+	err = bpf_prog_get_info_by_fd(tgt_fd, &info, &info_len);
 	if (err) {
 		p_err("failed to get func_info for prog FD %d", tgt_fd);
 		goto out;

tools/bpf/bpftool/struct_ops.c

@@ -151,7 +151,7 @@ static int get_next_struct_ops_map(const char *name, int *res_fd,
 			return -1;
 		}
 
-		err = bpf_obj_get_info_by_fd(fd, info, &info_len);
+		err = bpf_map_get_info_by_fd(fd, info, &info_len);
 		if (err) {
 			p_err("can't get map info: %s", strerror(errno));
 			close(fd);
@@ -262,7 +262,7 @@ static struct res do_one_id(const char *id_str, work_func func, void *data,
 		goto done;
 	}
 
-	if (bpf_obj_get_info_by_fd(fd, info, &info_len)) {
+	if (bpf_map_get_info_by_fd(fd, info, &info_len)) {
 		p_err("can't get map info: %s", strerror(errno));
 		res.nr_errs++;
 		goto done;
@@ -522,7 +522,7 @@ static int do_register(int argc, char **argv)
 		bpf_link__disconnect(link);
 		bpf_link__destroy(link);
 
-		if (!bpf_obj_get_info_by_fd(bpf_map__fd(map), &info,
+		if (!bpf_map_get_info_by_fd(bpf_map__fd(map), &info,
 					    &info_len))
 			p_info("Registered %s %s id %u",
 			       get_kern_struct_ops_name(&info),