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
do_pin(int argc,char ** argv)11 static 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 err = libbpf_get_error(obj);
50 if (err) {
51 p_err("can't open objfile %s", objfile);
52 goto close_map_fd;
53 }
54
55 err = bpf_object__load(obj);
56 if (err) {
57 p_err("can't load objfile %s", objfile);
58 goto close_obj;
59 }
60
61 prog = bpf_object__next_program(obj, NULL);
62 if (!prog) {
63 p_err("can't find bpf program in objfile %s", objfile);
64 goto close_obj;
65 }
66
67 link = bpf_program__attach_iter(prog, &iter_opts);
68 err = libbpf_get_error(link);
69 if (err) {
70 p_err("attach_iter failed for program %s",
71 bpf_program__name(prog));
72 goto close_obj;
73 }
74
75 err = mount_bpffs_for_pin(path);
76 if (err)
77 goto close_link;
78
79 err = bpf_link__pin(link, path);
80 if (err) {
81 p_err("pin_iter failed for program %s to path %s",
82 bpf_program__name(prog), path);
83 goto close_link;
84 }
85
86 close_link:
87 bpf_link__destroy(link);
88 close_obj:
89 bpf_object__close(obj);
90 close_map_fd:
91 if (map_fd >= 0)
92 close(map_fd);
93 return err;
94 }
95
do_help(int argc,char ** argv)96 static int do_help(int argc, char **argv)
97 {
98 fprintf(stderr,
99 "Usage: %1$s %2$s pin OBJ PATH [map MAP]\n"
100 " %1$s %2$s help\n"
101 "\n"
102 " " HELP_SPEC_MAP "\n"
103 " " HELP_SPEC_OPTIONS " }\n"
104 "",
105 bin_name, "iter");
106
107 return 0;
108 }
109
110 static const struct cmd cmds[] = {
111 { "help", do_help },
112 { "pin", do_pin },
113 { 0 }
114 };
115
do_iter(int argc,char ** argv)116 int do_iter(int argc, char **argv)
117 {
118 return cmd_select(cmds, argc, argv, do_help);
119 }
120