bpf/prog_tests/libbpf_probes.c

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /* Copyright (c) 2021 Facebook */
0003
0004 #include <test_progs.h>
0005 #include <bpf/btf.h>
0006
0007 void test_libbpf_probe_prog_types(void)
0008 {
0009     struct btf *btf;
0010     const struct btf_type *t;
0011     const struct btf_enum *e;
0012     int i, n, id;
0013
0014     btf = btf__parse("/sys/kernel/btf/vmlinux", NULL);
0015     if (!ASSERT_OK_PTR(btf, "btf_parse"))
0016         return;
0017
0018     /* find enum bpf_prog_type and enumerate each value */
0019     id = btf__find_by_name_kind(btf, "bpf_prog_type", BTF_KIND_ENUM);
0020     if (!ASSERT_GT(id, 0, "bpf_prog_type_id"))
0021         goto cleanup;
0022     t = btf__type_by_id(btf, id);
0023     if (!ASSERT_OK_PTR(t, "bpf_prog_type_enum"))
0024         goto cleanup;
0025
0026     for (e = btf_enum(t), i = 0, n = btf_vlen(t); i < n; e++, i++) {
0027         const char *prog_type_name = btf__str_by_offset(btf, e->name_off);
0028         enum bpf_prog_type prog_type = (enum bpf_prog_type)e->val;
0029         int res;
0030
0031         if (prog_type == BPF_PROG_TYPE_UNSPEC)
0032             continue;
0033
0034         if (!test__start_subtest(prog_type_name))
0035             continue;
0036
0037         res = libbpf_probe_bpf_prog_type(prog_type, NULL);
0038         ASSERT_EQ(res, 1, prog_type_name);
0039     }
0040
0041 cleanup:
0042     btf__free(btf);
0043 }
0044
0045 void test_libbpf_probe_map_types(void)
0046 {
0047     struct btf *btf;
0048     const struct btf_type *t;
0049     const struct btf_enum *e;
0050     int i, n, id;
0051
0052     btf = btf__parse("/sys/kernel/btf/vmlinux", NULL);
0053     if (!ASSERT_OK_PTR(btf, "btf_parse"))
0054         return;
0055
0056     /* find enum bpf_map_type and enumerate each value */
0057     id = btf__find_by_name_kind(btf, "bpf_map_type", BTF_KIND_ENUM);
0058     if (!ASSERT_GT(id, 0, "bpf_map_type_id"))
0059         goto cleanup;
0060     t = btf__type_by_id(btf, id);
0061     if (!ASSERT_OK_PTR(t, "bpf_map_type_enum"))
0062         goto cleanup;
0063
0064     for (e = btf_enum(t), i = 0, n = btf_vlen(t); i < n; e++, i++) {
0065         const char *map_type_name = btf__str_by_offset(btf, e->name_off);
0066         enum bpf_map_type map_type = (enum bpf_map_type)e->val;
0067         int res;
0068
0069         if (map_type == BPF_MAP_TYPE_UNSPEC)
0070             continue;
0071
0072         if (!test__start_subtest(map_type_name))
0073             continue;
0074
0075         res = libbpf_probe_bpf_map_type(map_type, NULL);
0076         ASSERT_EQ(res, 1, map_type_name);
0077     }
0078
0079 cleanup:
0080     btf__free(btf);
0081 }
0082
0083 void test_libbpf_probe_helpers(void)
0084 {
0085 #define CASE(prog, helper, supp) {          \
0086     .prog_type_name = "BPF_PROG_TYPE_" # prog,  \
0087     .helper_name = "bpf_" # helper,         \
0088     .prog_type = BPF_PROG_TYPE_ ## prog,        \
0089     .helper_id = BPF_FUNC_ ## helper,       \
0090     .supported = supp,              \
0091 }
0092     const struct case_def {
0093         const char *prog_type_name;
0094         const char *helper_name;
0095         enum bpf_prog_type prog_type;
0096         enum bpf_func_id helper_id;
0097         bool supported;
0098     } cases[] = {
0099         CASE(KPROBE, unspec, false),
0100         CASE(KPROBE, map_lookup_elem, true),
0101         CASE(KPROBE, loop, true),
0102
0103         CASE(KPROBE, ktime_get_coarse_ns, false),
0104         CASE(SOCKET_FILTER, ktime_get_coarse_ns, true),
0105
0106         CASE(KPROBE, sys_bpf, false),
0107         CASE(SYSCALL, sys_bpf, true),
0108     };
0109     size_t case_cnt = ARRAY_SIZE(cases), i;
0110     char buf[128];
0111
0112     for (i = 0; i < case_cnt; i++) {
0113         const struct case_def *d = &cases[i];
0114         int res;
0115
0116         snprintf(buf, sizeof(buf), "%s+%s", d->prog_type_name, d->helper_name);
0117
0118         if (!test__start_subtest(buf))
0119             continue;
0120
0121         res = libbpf_probe_bpf_helper(d->prog_type, d->helper_id, NULL);
0122         ASSERT_EQ(res, d->supported, buf);
0123     }
0124 }