bpftool: Mount bpffs on provided dir instead of parent dir

When pinning programs/objects under PATH (eg: during "bpftool prog
loadall") the bpffs is mounted on the parent dir of PATH in the
following situations:
- the given dir exists but it is not bpffs.
- the given dir doesn't exist and the parent dir is not bpffs.

Mounting on the parent dir can also have the unintentional side-
effect of hiding other files located under the parent dir.

If the given dir exists but is not bpffs, then the bpffs should
be mounted on the given dir and not its parent dir.

Similarly, if the given dir doesn't exist and its parent dir is not
bpffs, then the given dir should be created and the bpffs should be
mounted on this new dir.

Link: https://lore.kernel.org/bpf/[email protected]/T/#t

Closes: libbpf/bpftool#100

Fixes: 2a36c26 ("bpftool: Support bpffs mountpoint as pin path for prog loadall")

Signed-off-by: Sahil Siddiq <[email protected]>

tools/bpf/bpftool/common.c

@@ -244,24 +244,80 @@ int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type)
 	return fd;
 }
 
-int mount_bpffs_for_pin(const char *name, bool is_dir)
+int mount_bpffs_on_dir(const char *dir_name)
 {
 	char err_str[ERR_MAX_LEN];
-	char *file;
-	char *dir;
 	int err = 0;
 
-	if (is_dir && is_bpffs(name))
+	if (is_bpffs(dir_name))
 		return err;
 
-	file = malloc(strlen(name) + 1);
-	if (!file) {
+	if (access(dir_name, F_OK) == -1) {
+		char *temp_name;
+		char *parent_name;
+
+		temp_name = malloc(strlen(dir_name) + 1);
+		if (!temp_name) {
+			p_err("mem alloc failed");
+			return -1;
+		}
+
+		strcpy(temp_name, dir_name);
+		parent_name = dirname(temp_name);
+
+		if (is_bpffs(parent_name)) {
+			/* nothing to do if already mounted */
+			free(temp_name);
+			return err;
+		}
+
+		free(temp_name);
+
+		if (block_mount) {
+			p_err("no BPF file system found, not mounting it due to --nomount option");
+			return -1;
+		}
+
+		err = mkdir(dir_name, 0700);
+		if (err) {
+			p_err("failed to create dir (%s): %s", dir_name, strerror(errno));
+			return err;
+		}
+	} else if (block_mount) {
+		p_err("no BPF file system found, not mounting it due to --nomount option");
+		return -1;
+	}
+
+	err = mnt_fs(dir_name, "bpf", err_str, ERR_MAX_LEN);
+	if (err) {
+		err_str[ERR_MAX_LEN - 1] = '\0';
+		p_err("can't mount BPF file system on given dir (%s): %s",
+		      dir_name, err_str);
+	}
+
+	return err;
+}
+
+int mount_bpffs_given_file(const char *file_name)
+{
+	char err_str[ERR_MAX_LEN];
+	char *temp_name;
+	char *dir;
+	int err = 0;
+
+	if (access(file_name, F_OK) != -1) {
+		p_err("bpf object can't be pinned since file (%s) already exists", file_name);
+		return -1;
+	}
+
+	temp_name = malloc(strlen(file_name) + 1);
+	if (!temp_name) {
 		p_err("mem alloc failed");
 		return -1;
 	}
 
-	strcpy(file, name);
-	dir = dirname(file);
+	strcpy(temp_name, file_name);
+	dir = dirname(temp_name);
 
 	if (is_bpffs(dir))
 		/* nothing to do if already mounted */
@@ -277,19 +333,19 @@ int mount_bpffs_for_pin(const char *name, bool is_dir)
 	if (err) {
 		err_str[ERR_MAX_LEN - 1] = '\0';
 		p_err("can't mount BPF file system to pin the object (%s): %s",
-		      name, err_str);
+		      file_name, err_str);
 	}
 
 out_free:
-	free(file);
+	free(temp_name);
 	return err;
 }
 
 int do_pin_fd(int fd, const char *name)
 {
 	int err;
 
-	err = mount_bpffs_for_pin(name, false);
+	err = mount_bpffs_given_file(name);
 	if (err)
 		return err;
 

tools/bpf/bpftool/iter.c

@@ -76,7 +76,7 @@ static int do_pin(int argc, char **argv)
 		goto close_obj;
 	}
 
-	err = mount_bpffs_for_pin(path, false);
+	err = mount_bpffs_given_file(path);
 	if (err)
 		goto close_link;
 

tools/bpf/bpftool/main.h

@@ -142,7 +142,8 @@ const char *get_fd_type_name(enum bpf_obj_type type);
 char *get_fdinfo(int fd, const char *key);
 int open_obj_pinned(const char *path, bool quiet);
 int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type);
-int mount_bpffs_for_pin(const char *name, bool is_dir);
+int mount_bpffs_given_file(const char *file_name);
+int mount_bpffs_on_dir(const char *dir_name);
 int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(int *, char ***));
 int do_pin_fd(int fd, const char *name);
 

tools/bpf/bpftool/prog.c

@@ -1778,7 +1778,10 @@ static int load_with_options(int argc, char **argv, bool first_prog_only)
 		goto err_close_obj;
 	}
 
-	err = mount_bpffs_for_pin(pinfile, !first_prog_only);
+	if (first_prog_only)
+		err = mount_bpffs_given_file(pinfile);
+	else
+		err = mount_bpffs_on_dir(pinfile);
 	if (err)
 		goto err_close_obj;
 

tools/bpf/bpftool/struct_ops.c

@@ -515,7 +515,7 @@ static int do_register(int argc, char **argv)
 	if (argc == 1)
 		linkdir = GET_ARG();
 
-	if (linkdir && mount_bpffs_for_pin(linkdir, true)) {
+	if (linkdir && mount_bpffs_on_dir(linkdir)) {
 		p_err("can't mount bpffs for pinning");
 		return -1;
 	}