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Currently, when using prog loadall and the pin path is a bpffs mountpoint, bpffs will be repeatedly mounted to the parent directory of the bpffs mountpoint path. For example, a `bpftool prog loadall test.o /sys/fs/bpf` will trigger this. Signed-off-by: Pengcheng Yang <yangpc@wangsu.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Quentin Monnet <quentin@isovalent.com> Link: https://lore.kernel.org/bpf/1683342439-3677-1-git-send-email-yangpc@wangsu.com
123 lines
2.3 KiB
C
123 lines
2.3 KiB
C
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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// Copyright (C) 2020 Facebook
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <errno.h>
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#include <unistd.h>
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#include <linux/err.h>
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#include <bpf/libbpf.h>
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#include "main.h"
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static int do_pin(int argc, char **argv)
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{
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DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, iter_opts);
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union bpf_iter_link_info linfo;
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const char *objfile, *path;
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struct bpf_program *prog;
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struct bpf_object *obj;
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struct bpf_link *link;
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int err = -1, map_fd = -1;
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if (!REQ_ARGS(2))
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usage();
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objfile = GET_ARG();
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path = GET_ARG();
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/* optional arguments */
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if (argc) {
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if (is_prefix(*argv, "map")) {
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NEXT_ARG();
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if (!REQ_ARGS(2)) {
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p_err("incorrect map spec");
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return -1;
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}
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map_fd = map_parse_fd(&argc, &argv);
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if (map_fd < 0)
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return -1;
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memset(&linfo, 0, sizeof(linfo));
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linfo.map.map_fd = map_fd;
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iter_opts.link_info = &linfo;
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iter_opts.link_info_len = sizeof(linfo);
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}
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}
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obj = bpf_object__open(objfile);
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if (!obj) {
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err = -errno;
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p_err("can't open objfile %s", objfile);
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goto close_map_fd;
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}
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err = bpf_object__load(obj);
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if (err) {
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p_err("can't load objfile %s", objfile);
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goto close_obj;
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}
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prog = bpf_object__next_program(obj, NULL);
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if (!prog) {
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err = -errno;
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p_err("can't find bpf program in objfile %s", objfile);
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goto close_obj;
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}
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link = bpf_program__attach_iter(prog, &iter_opts);
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if (!link) {
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err = -errno;
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p_err("attach_iter failed for program %s",
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bpf_program__name(prog));
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goto close_obj;
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}
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err = mount_bpffs_for_pin(path, false);
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if (err)
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goto close_link;
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err = bpf_link__pin(link, path);
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if (err) {
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p_err("pin_iter failed for program %s to path %s",
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bpf_program__name(prog), path);
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goto close_link;
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}
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close_link:
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bpf_link__destroy(link);
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close_obj:
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bpf_object__close(obj);
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close_map_fd:
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if (map_fd >= 0)
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close(map_fd);
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return err;
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}
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static int do_help(int argc, char **argv)
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{
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fprintf(stderr,
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"Usage: %1$s %2$s pin OBJ PATH [map MAP]\n"
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" %1$s %2$s help\n"
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"\n"
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" " HELP_SPEC_MAP "\n"
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" " HELP_SPEC_OPTIONS " }\n"
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"",
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bin_name, "iter");
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return 0;
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}
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static const struct cmd cmds[] = {
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{ "help", do_help },
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{ "pin", do_pin },
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{ 0 }
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};
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int do_iter(int argc, char **argv)
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{
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return cmd_select(cmds, argc, argv, do_help);
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}
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