1
2#include <test_progs.h>
3
4static void test_global_data_number(struct bpf_object *obj, __u32 duration)
5{
6 int i, err, map_fd;
7 uint64_t num;
8
9 map_fd = bpf_find_map(__func__, obj, "result_number");
10 if (CHECK_FAIL(map_fd < 0))
11 return;
12
13 struct {
14 char *name;
15 uint32_t key;
16 uint64_t num;
17 } tests[] = {
18 { "relocate .bss reference", 0, 0 },
19 { "relocate .data reference", 1, 42 },
20 { "relocate .rodata reference", 2, 24 },
21 { "relocate .bss reference", 3, 0 },
22 { "relocate .data reference", 4, 0xffeeff },
23 { "relocate .rodata reference", 5, 0xabab },
24 { "relocate .bss reference", 6, 1234 },
25 { "relocate .bss reference", 7, 0 },
26 { "relocate .rodata reference", 8, 0xab },
27 { "relocate .rodata reference", 9, 0x1111111111111111 },
28 { "relocate .rodata reference", 10, ~0 },
29 };
30
31 for (i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
32 err = bpf_map_lookup_elem(map_fd, &tests[i].key, &num);
33 CHECK(err || num != tests[i].num, tests[i].name,
34 "err %d result %lx expected %lx\n",
35 err, num, tests[i].num);
36 }
37}
38
39static void test_global_data_string(struct bpf_object *obj, __u32 duration)
40{
41 int i, err, map_fd;
42 char str[32];
43
44 map_fd = bpf_find_map(__func__, obj, "result_string");
45 if (CHECK_FAIL(map_fd < 0))
46 return;
47
48 struct {
49 char *name;
50 uint32_t key;
51 char str[32];
52 } tests[] = {
53 { "relocate .rodata reference", 0, "abcdefghijklmnopqrstuvwxyz" },
54 { "relocate .data reference", 1, "abcdefghijklmnopqrstuvwxyz" },
55 { "relocate .bss reference", 2, "" },
56 { "relocate .data reference", 3, "abcdexghijklmnopqrstuvwxyz" },
57 { "relocate .bss reference", 4, "\0\0hello" },
58 };
59
60 for (i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
61 err = bpf_map_lookup_elem(map_fd, &tests[i].key, str);
62 CHECK(err || memcmp(str, tests[i].str, sizeof(str)),
63 tests[i].name, "err %d result \'%s\' expected \'%s\'\n",
64 err, str, tests[i].str);
65 }
66}
67
68struct foo {
69 __u8 a;
70 __u32 b;
71 __u64 c;
72};
73
74static void test_global_data_struct(struct bpf_object *obj, __u32 duration)
75{
76 int i, err, map_fd;
77 struct foo val;
78
79 map_fd = bpf_find_map(__func__, obj, "result_struct");
80 if (CHECK_FAIL(map_fd < 0))
81 return;
82
83 struct {
84 char *name;
85 uint32_t key;
86 struct foo val;
87 } tests[] = {
88 { "relocate .rodata reference", 0, { 42, 0xfefeefef, 0x1111111111111111ULL, } },
89 { "relocate .bss reference", 1, { } },
90 { "relocate .rodata reference", 2, { } },
91 { "relocate .data reference", 3, { 41, 0xeeeeefef, 0x2111111111111111ULL, } },
92 };
93
94 for (i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
95 err = bpf_map_lookup_elem(map_fd, &tests[i].key, &val);
96 CHECK(err || memcmp(&val, &tests[i].val, sizeof(val)),
97 tests[i].name, "err %d result { %u, %u, %llu } expected { %u, %u, %llu }\n",
98 err, val.a, val.b, val.c, tests[i].val.a, tests[i].val.b, tests[i].val.c);
99 }
100}
101
102static void test_global_data_rdonly(struct bpf_object *obj, __u32 duration)
103{
104 int err = -ENOMEM, map_fd, zero = 0;
105 struct bpf_map *map;
106 __u8 *buff;
107
108 map = bpf_object__find_map_by_name(obj, "test_glo.rodata");
109 if (CHECK_FAIL(!map || !bpf_map__is_internal(map)))
110 return;
111
112 map_fd = bpf_map__fd(map);
113 if (CHECK_FAIL(map_fd < 0))
114 return;
115
116 buff = malloc(bpf_map__def(map)->value_size);
117 if (buff)
118 err = bpf_map_update_elem(map_fd, &zero, buff, 0);
119 free(buff);
120 CHECK(!err || errno != EPERM, "test .rodata read-only map",
121 "err %d errno %d\n", err, errno);
122}
123
124void test_global_data(void)
125{
126 const char *file = "./test_global_data.o";
127 __u32 duration = 0, retval;
128 struct bpf_object *obj;
129 int err, prog_fd;
130
131 err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
132 if (CHECK(err, "load program", "error %d loading %s\n", err, file))
133 return;
134
135 err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
136 NULL, NULL, &retval, &duration);
137 CHECK(err || retval, "pass global data run",
138 "err %d errno %d retval %d duration %d\n",
139 err, errno, retval, duration);
140
141 test_global_data_number(obj, duration);
142 test_global_data_string(obj, duration);
143 test_global_data_struct(obj, duration);
144 test_global_data_rdonly(obj, duration);
145
146 bpf_object__close(obj);
147}
148
