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