1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 #include <network_helpers.h>
4
5 static 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 < ARRAY_SIZE(tests); 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
40 static 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 < ARRAY_SIZE(tests); 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
69 struct foo {
70 __u8 a;
71 __u32 b;
72 __u64 c;
73 };
74
75 static 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 < ARRAY_SIZE(tests); 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
103 static 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, *map2;
107 __u8 *buff;
108
109 map = bpf_object__find_map_by_name(obj, "test_glo.rodata");
110 if (!ASSERT_OK_PTR(map, "map"))
111 return;
112 if (!ASSERT_TRUE(bpf_map__is_internal(map), "is_internal"))
113 return;
114
115 /* ensure we can lookup internal maps by their ELF names */
116 map2 = bpf_object__find_map_by_name(obj, ".rodata");
117 if (!ASSERT_EQ(map, map2, "same_maps"))
118 return;
119
120 map_fd = bpf_map__fd(map);
121 if (CHECK_FAIL(map_fd < 0))
122 return;
123
124 buff = malloc(bpf_map__value_size(map));
125 if (buff)
126 err = bpf_map_update_elem(map_fd, &zero, buff, 0);
127 free(buff);
128 CHECK(!err || errno != EPERM, "test .rodata read-only map",
129 "err %d errno %d\n", err, errno);
130 }
131
132 void test_global_data(void)
133 {
134 const char *file = "./test_global_data.bpf.o";
135 struct bpf_object *obj;
136 int err, prog_fd;
137 LIBBPF_OPTS(bpf_test_run_opts, topts,
138 .data_in = &pkt_v4,
139 .data_size_in = sizeof(pkt_v4),
140 .repeat = 1,
141 );
142
143 err = bpf_prog_test_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
144 if (!ASSERT_OK(err, "load program"))
145 return;
146
147 err = bpf_prog_test_run_opts(prog_fd, &topts);
148 ASSERT_OK(err, "pass global data run err");
149 ASSERT_OK(topts.retval, "pass global data run retval");
150
151 test_global_data_number(obj, topts.duration);
152 test_global_data_string(obj, topts.duration);
153 test_global_data_struct(obj, topts.duration);
154 test_global_data_rdonly(obj, topts.duration);
155
156 bpf_object__close(obj);
157 }
158
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