1
2#include <test_progs.h>
3#include <network_helpers.h>
4
5static void test_global_data_number(struct bpf_object *obj, __u32 duration)
6{
7 int i, err, map_fd;
8 __u64 num;
9
10 map_fd = bpf_find_map(__func__, obj, "result_number");
11 if (CHECK_FAIL(map_fd < 0))
12 return;
13
14 struct {
15 char *name;
16 uint32_t key;
17 __u64 num;
18 } tests[] = {
19 { "relocate .bss reference", 0, 0 },
20 { "relocate .data reference", 1, 42 },
21 { "relocate .rodata reference", 2, 24 },
22 { "relocate .bss reference", 3, 0 },
23 { "relocate .data reference", 4, 0xffeeff },
24 { "relocate .rodata reference", 5, 0xabab },
25 { "relocate .bss reference", 6, 1234 },
26 { "relocate .bss reference", 7, 0 },
27 { "relocate .rodata reference", 8, 0xab },
28 { "relocate .rodata reference", 9, 0x1111111111111111 },
29 { "relocate .rodata reference", 10, ~0 },
30 };
31
32 for (i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
33 err = bpf_map_lookup_elem(map_fd, &tests[i].key, &num);
34 CHECK(err || num != tests[i].num, tests[i].name,
35 "err %d result %llx expected %llx\n",
36 err, num, tests[i].num);
37 }
38}
39
40static void test_global_data_string(struct bpf_object *obj, __u32 duration)
41{
42 int i, err, map_fd;
43 char str[32];
44
45 map_fd = bpf_find_map(__func__, obj, "result_string");
46 if (CHECK_FAIL(map_fd < 0))
47 return;
48
49 struct {
50 char *name;
51 uint32_t key;
52 char str[32];
53 } tests[] = {
54 { "relocate .rodata reference", 0, "abcdefghijklmnopqrstuvwxyz" },
55 { "relocate .data reference", 1, "abcdefghijklmnopqrstuvwxyz" },
56 { "relocate .bss reference", 2, "" },
57 { "relocate .data reference", 3, "abcdexghijklmnopqrstuvwxyz" },
58 { "relocate .bss reference", 4, "\0\0hello" },
59 };
60
61 for (i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
62 err = bpf_map_lookup_elem(map_fd, &tests[i].key, str);
63 CHECK(err || memcmp(str, tests[i].str, sizeof(str)),
64 tests[i].name, "err %d result \'%s\' expected \'%s\'\n",
65 err, str, tests[i].str);
66 }
67}
68
69struct foo {
70 __u8 a;
71 __u32 b;
72 __u64 c;
73};
74
75static void test_global_data_struct(struct bpf_object *obj, __u32 duration)
76{
77 int i, err, map_fd;
78 struct foo val;
79
80 map_fd = bpf_find_map(__func__, obj, "result_struct");
81 if (CHECK_FAIL(map_fd < 0))
82 return;
83
84 struct {
85 char *name;
86 uint32_t key;
87 struct foo val;
88 } tests[] = {
89 { "relocate .rodata reference", 0, { 42, 0xfefeefef, 0x1111111111111111ULL, } },
90 { "relocate .bss reference", 1, { } },
91 { "relocate .rodata reference", 2, { } },
92 { "relocate .data reference", 3, { 41, 0xeeeeefef, 0x2111111111111111ULL, } },
93 };
94
95 for (i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
96 err = bpf_map_lookup_elem(map_fd, &tests[i].key, &val);
97 CHECK(err || memcmp(&val, &tests[i].val, sizeof(val)),
98 tests[i].name, "err %d result { %u, %u, %llu } expected { %u, %u, %llu }\n",
99 err, val.a, val.b, val.c, tests[i].val.a, tests[i].val.b, tests[i].val.c);
100 }
101}
102
103static void test_global_data_rdonly(struct bpf_object *obj, __u32 duration)
104{
105 int err = -ENOMEM, map_fd, zero = 0;
106 struct bpf_map *map;
107 __u8 *buff;
108
109 map = bpf_object__find_map_by_name(obj, "test_glo.rodata");
110 if (CHECK_FAIL(!map || !bpf_map__is_internal(map)))
111 return;
112
113 map_fd = bpf_map__fd(map);
114 if (CHECK_FAIL(map_fd < 0))
115 return;
116
117 buff = malloc(bpf_map__def(map)->value_size);
118 if (buff)
119 err = bpf_map_update_elem(map_fd, &zero, buff, 0);
120 free(buff);
121 CHECK(!err || errno != EPERM, "test .rodata read-only map",
122 "err %d errno %d\n", err, errno);
123}
124
125void test_global_data(void)
126{
127 const char *file = "./test_global_data.o";
128 __u32 duration = 0, retval;
129 struct bpf_object *obj;
130 int err, prog_fd;
131
132 err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
133 if (CHECK(err, "load program", "error %d loading %s\n", err, file))
134 return;
135
136 err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
137 NULL, NULL, &retval, &duration);
138 CHECK(err || retval, "pass global data run",
139 "err %d errno %d retval %d duration %d\n",
140 err, errno, retval, duration);
141
142 test_global_data_number(obj, duration);
143 test_global_data_string(obj, duration);
144 test_global_data_struct(obj, duration);
145 test_global_data_rdonly(obj, duration);
146
147 bpf_object__close(obj);
148}
149
