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1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2// Copyright (C) 2020 Facebook
3
4#define _GNU_SOURCE
5#include <unistd.h>
6#include <linux/err.h>
7#include <bpf/libbpf.h>
8
9#include "main.h"
10
11static int do_pin(int argc, char **argv)
12{
13 DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, iter_opts);
14 union bpf_iter_link_info linfo;
15 const char *objfile, *path;
16 struct bpf_program *prog;
17 struct bpf_object *obj;
18 struct bpf_link *link;
19 int err = -1, map_fd = -1;
20
21 if (!REQ_ARGS(2))
22 usage();
23
24 objfile = GET_ARG();
25 path = GET_ARG();
26
27 /* optional arguments */
28 if (argc) {
29 if (is_prefix(*argv, "map")) {
30 NEXT_ARG();
31
32 if (!REQ_ARGS(2)) {
33 p_err("incorrect map spec");
34 return -1;
35 }
36
37 map_fd = map_parse_fd(&argc, &argv);
38 if (map_fd < 0)
39 return -1;
40
41 memset(&linfo, 0, sizeof(linfo));
42 linfo.map.map_fd = map_fd;
43 iter_opts.link_info = &linfo;
44 iter_opts.link_info_len = sizeof(linfo);
45 }
46 }
47
48 obj = bpf_object__open(objfile);
49 if (IS_ERR(obj)) {
50 p_err("can't open objfile %s", objfile);
51 goto close_map_fd;
52 }
53
54 err = bpf_object__load(obj);
55 if (err) {
56 p_err("can't load objfile %s", objfile);
57 goto close_obj;
58 }
59
60 prog = bpf_program__next(NULL, obj);
61 if (!prog) {
62 p_err("can't find bpf program in objfile %s", objfile);
63 goto close_obj;
64 }
65
66 link = bpf_program__attach_iter(prog, &iter_opts);
67 if (IS_ERR(link)) {
68 err = PTR_ERR(link);
69 p_err("attach_iter failed for program %s",
70 bpf_program__name(prog));
71 goto close_obj;
72 }
73
74 err = mount_bpffs_for_pin(path);
75 if (err)
76 goto close_link;
77
78 err = bpf_link__pin(link, path);
79 if (err) {
80 p_err("pin_iter failed for program %s to path %s",
81 bpf_program__name(prog), path);
82 goto close_link;
83 }
84
85close_link:
86 bpf_link__destroy(link);
87close_obj:
88 bpf_object__close(obj);
89close_map_fd:
90 if (map_fd >= 0)
91 close(map_fd);
92 return err;
93}
94
95static int do_help(int argc, char **argv)
96{
97 fprintf(stderr,
98 "Usage: %1$s %2$s pin OBJ PATH [map MAP]\n"
99 " %1$s %2$s help\n"
100 " " HELP_SPEC_MAP "\n"
101 "",
102 bin_name, "iter");
103
104 return 0;
105}
106
107static const struct cmd cmds[] = {
108 { "help", do_help },
109 { "pin", do_pin },
110 { 0 }
111};
112
113int do_iter(int argc, char **argv)
114{
115 return cmd_select(cmds, argc, argv, do_help);
116}
1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2// Copyright (C) 2020 Facebook
3
4#ifndef _GNU_SOURCE
5#define _GNU_SOURCE
6#endif
7#include <errno.h>
8#include <unistd.h>
9#include <linux/err.h>
10#include <bpf/libbpf.h>
11
12#include "main.h"
13
14static int do_pin(int argc, char **argv)
15{
16 DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, iter_opts);
17 union bpf_iter_link_info linfo;
18 const char *objfile, *path;
19 struct bpf_program *prog;
20 struct bpf_object *obj;
21 struct bpf_link *link;
22 int err = -1, map_fd = -1;
23
24 if (!REQ_ARGS(2))
25 usage();
26
27 objfile = GET_ARG();
28 path = GET_ARG();
29
30 /* optional arguments */
31 if (argc) {
32 if (is_prefix(*argv, "map")) {
33 NEXT_ARG();
34
35 if (!REQ_ARGS(2)) {
36 p_err("incorrect map spec");
37 return -1;
38 }
39
40 map_fd = map_parse_fd(&argc, &argv);
41 if (map_fd < 0)
42 return -1;
43
44 memset(&linfo, 0, sizeof(linfo));
45 linfo.map.map_fd = map_fd;
46 iter_opts.link_info = &linfo;
47 iter_opts.link_info_len = sizeof(linfo);
48 }
49 }
50
51 obj = bpf_object__open(objfile);
52 if (!obj) {
53 err = -errno;
54 p_err("can't open objfile %s", objfile);
55 goto close_map_fd;
56 }
57
58 err = bpf_object__load(obj);
59 if (err) {
60 p_err("can't load objfile %s", objfile);
61 goto close_obj;
62 }
63
64 prog = bpf_object__next_program(obj, NULL);
65 if (!prog) {
66 err = -errno;
67 p_err("can't find bpf program in objfile %s", objfile);
68 goto close_obj;
69 }
70
71 link = bpf_program__attach_iter(prog, &iter_opts);
72 if (!link) {
73 err = -errno;
74 p_err("attach_iter failed for program %s",
75 bpf_program__name(prog));
76 goto close_obj;
77 }
78
79 err = mount_bpffs_for_pin(path, false);
80 if (err)
81 goto close_link;
82
83 err = bpf_link__pin(link, path);
84 if (err) {
85 p_err("pin_iter failed for program %s to path %s",
86 bpf_program__name(prog), path);
87 goto close_link;
88 }
89
90close_link:
91 bpf_link__destroy(link);
92close_obj:
93 bpf_object__close(obj);
94close_map_fd:
95 if (map_fd >= 0)
96 close(map_fd);
97 return err;
98}
99
100static int do_help(int argc, char **argv)
101{
102 fprintf(stderr,
103 "Usage: %1$s %2$s pin OBJ PATH [map MAP]\n"
104 " %1$s %2$s help\n"
105 "\n"
106 " " HELP_SPEC_MAP "\n"
107 " " HELP_SPEC_OPTIONS " }\n"
108 "",
109 bin_name, "iter");
110
111 return 0;
112}
113
114static const struct cmd cmds[] = {
115 { "help", do_help },
116 { "pin", do_pin },
117 { 0 }
118};
119
120int do_iter(int argc, char **argv)
121{
122 return cmd_select(cmds, argc, argv, do_help);
123}