1*4882a593Smuzhiyun // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2*4882a593Smuzhiyun // Copyright (C) 2020 Facebook
3*4882a593Smuzhiyun
4*4882a593Smuzhiyun #define _GNU_SOURCE
5*4882a593Smuzhiyun #include <unistd.h>
6*4882a593Smuzhiyun #include <linux/err.h>
7*4882a593Smuzhiyun #include <bpf/libbpf.h>
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include "main.h"
10*4882a593Smuzhiyun
do_pin(int argc,char ** argv)11*4882a593Smuzhiyun static int do_pin(int argc, char **argv)
12*4882a593Smuzhiyun {
13*4882a593Smuzhiyun DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, iter_opts);
14*4882a593Smuzhiyun union bpf_iter_link_info linfo;
15*4882a593Smuzhiyun const char *objfile, *path;
16*4882a593Smuzhiyun struct bpf_program *prog;
17*4882a593Smuzhiyun struct bpf_object *obj;
18*4882a593Smuzhiyun struct bpf_link *link;
19*4882a593Smuzhiyun int err = -1, map_fd = -1;
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun if (!REQ_ARGS(2))
22*4882a593Smuzhiyun usage();
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun objfile = GET_ARG();
25*4882a593Smuzhiyun path = GET_ARG();
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun /* optional arguments */
28*4882a593Smuzhiyun if (argc) {
29*4882a593Smuzhiyun if (is_prefix(*argv, "map")) {
30*4882a593Smuzhiyun NEXT_ARG();
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun if (!REQ_ARGS(2)) {
33*4882a593Smuzhiyun p_err("incorrect map spec");
34*4882a593Smuzhiyun return -1;
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun map_fd = map_parse_fd(&argc, &argv);
38*4882a593Smuzhiyun if (map_fd < 0)
39*4882a593Smuzhiyun return -1;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun memset(&linfo, 0, sizeof(linfo));
42*4882a593Smuzhiyun linfo.map.map_fd = map_fd;
43*4882a593Smuzhiyun iter_opts.link_info = &linfo;
44*4882a593Smuzhiyun iter_opts.link_info_len = sizeof(linfo);
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun obj = bpf_object__open(objfile);
49*4882a593Smuzhiyun if (IS_ERR(obj)) {
50*4882a593Smuzhiyun p_err("can't open objfile %s", objfile);
51*4882a593Smuzhiyun goto close_map_fd;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun err = bpf_object__load(obj);
55*4882a593Smuzhiyun if (err) {
56*4882a593Smuzhiyun p_err("can't load objfile %s", objfile);
57*4882a593Smuzhiyun goto close_obj;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun prog = bpf_program__next(NULL, obj);
61*4882a593Smuzhiyun if (!prog) {
62*4882a593Smuzhiyun p_err("can't find bpf program in objfile %s", objfile);
63*4882a593Smuzhiyun goto close_obj;
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun link = bpf_program__attach_iter(prog, &iter_opts);
67*4882a593Smuzhiyun if (IS_ERR(link)) {
68*4882a593Smuzhiyun err = PTR_ERR(link);
69*4882a593Smuzhiyun p_err("attach_iter failed for program %s",
70*4882a593Smuzhiyun bpf_program__name(prog));
71*4882a593Smuzhiyun goto close_obj;
72*4882a593Smuzhiyun }
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun err = mount_bpffs_for_pin(path);
75*4882a593Smuzhiyun if (err)
76*4882a593Smuzhiyun goto close_link;
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun err = bpf_link__pin(link, path);
79*4882a593Smuzhiyun if (err) {
80*4882a593Smuzhiyun p_err("pin_iter failed for program %s to path %s",
81*4882a593Smuzhiyun bpf_program__name(prog), path);
82*4882a593Smuzhiyun goto close_link;
83*4882a593Smuzhiyun }
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun close_link:
86*4882a593Smuzhiyun bpf_link__destroy(link);
87*4882a593Smuzhiyun close_obj:
88*4882a593Smuzhiyun bpf_object__close(obj);
89*4882a593Smuzhiyun close_map_fd:
90*4882a593Smuzhiyun if (map_fd >= 0)
91*4882a593Smuzhiyun close(map_fd);
92*4882a593Smuzhiyun return err;
93*4882a593Smuzhiyun }
94*4882a593Smuzhiyun
do_help(int argc,char ** argv)95*4882a593Smuzhiyun static int do_help(int argc, char **argv)
96*4882a593Smuzhiyun {
97*4882a593Smuzhiyun fprintf(stderr,
98*4882a593Smuzhiyun "Usage: %1$s %2$s pin OBJ PATH [map MAP]\n"
99*4882a593Smuzhiyun " %1$s %2$s help\n"
100*4882a593Smuzhiyun " " HELP_SPEC_MAP "\n"
101*4882a593Smuzhiyun "",
102*4882a593Smuzhiyun bin_name, "iter");
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun return 0;
105*4882a593Smuzhiyun }
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun static const struct cmd cmds[] = {
108*4882a593Smuzhiyun { "help", do_help },
109*4882a593Smuzhiyun { "pin", do_pin },
110*4882a593Smuzhiyun { 0 }
111*4882a593Smuzhiyun };
112*4882a593Smuzhiyun
do_iter(int argc,char ** argv)113*4882a593Smuzhiyun int do_iter(int argc, char **argv)
114*4882a593Smuzhiyun {
115*4882a593Smuzhiyun return cmd_select(cmds, argc, argv, do_help);
116*4882a593Smuzhiyun }
117