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 < 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 
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 < 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 
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 < 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 
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__def(map)->value_size);
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.o";
135 	__u32 duration = 0, retval;
136 	struct bpf_object *obj;
137 	int err, prog_fd;
138 
139 	err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
140 	if (CHECK(err, "load program", "error %d loading %s\n", err, file))
141 		return;
142 
143 	err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
144 				NULL, NULL, &retval, &duration);
145 	CHECK(err || retval, "pass global data run",
146 	      "err %d errno %d retval %d duration %d\n",
147 	      err, errno, retval, duration);
148 
149 	test_global_data_number(obj, duration);
150 	test_global_data_string(obj, duration);
151 	test_global_data_struct(obj, duration);
152 	test_global_data_rdonly(obj, duration);
153 
154 	bpf_object__close(obj);
155 }
156