projects/linux·blob master · refs

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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2017 Facebook
4 */
5#include <sys/socket.h>
6#include <arpa/inet.h>
7#include <stdint.h>
8#include <assert.h>
9#include <errno.h>
10#include <stdlib.h>
11#include <stdio.h>
12#include <bpf/bpf.h>
13#include <bpf/libbpf.h>
14
15#include "bpf_util.h"
16
17static int map_fd[7];
18
19#define PORT_A (map_fd[0])
20#define PORT_H (map_fd[1])
21#define REG_RESULT_H (map_fd[2])
22#define INLINE_RESULT_H (map_fd[3])
23#define A_OF_PORT_A (map_fd[4]) /* Test case #0 */
24#define H_OF_PORT_A (map_fd[5]) /* Test case #1 */
25#define H_OF_PORT_H (map_fd[6]) /* Test case #2 */
26
27static const char * const test_names[] = {
28 "Array of Array",
29 "Hash of Array",
30 "Hash of Hash",
31};
32
33#define NR_TESTS ARRAY_SIZE(test_names)
34
35static void check_map_id(int inner_map_fd, int map_in_map_fd, uint32_t key)
36{
37 struct bpf_map_info info = {};
38 uint32_t info_len = sizeof(info);
39 int ret, id;
40
41 ret = bpf_map_get_info_by_fd(inner_map_fd, &info, &info_len);
42 assert(!ret);
43
44 ret = bpf_map_lookup_elem(map_in_map_fd, &key, &id);
45 assert(!ret);
46 assert(id == info.id);
47}
48
49static void populate_map(uint32_t port_key, int magic_result)
50{
51 int ret;
52
53 ret = bpf_map_update_elem(PORT_A, &port_key, &magic_result, BPF_ANY);
54 assert(!ret);
55
56 ret = bpf_map_update_elem(PORT_H, &port_key, &magic_result,
57 BPF_NOEXIST);
58 assert(!ret);
59
60 ret = bpf_map_update_elem(A_OF_PORT_A, &port_key, &PORT_A, BPF_ANY);
61 assert(!ret);
62 check_map_id(PORT_A, A_OF_PORT_A, port_key);
63
64 ret = bpf_map_update_elem(H_OF_PORT_A, &port_key, &PORT_A, BPF_NOEXIST);
65 assert(!ret);
66 check_map_id(PORT_A, H_OF_PORT_A, port_key);
67
68 ret = bpf_map_update_elem(H_OF_PORT_H, &port_key, &PORT_H, BPF_NOEXIST);
69 assert(!ret);
70 check_map_id(PORT_H, H_OF_PORT_H, port_key);
71}
72
73static void test_map_in_map(void)
74{
75 struct sockaddr_in6 in6 = { .sin6_family = AF_INET6 };
76 uint32_t result_key = 0, port_key;
77 int result, inline_result;
78 int magic_result = 0xfaceb00c;
79 int ret;
80 int i;
81
82 port_key = rand() & 0x00FF;
83 populate_map(port_key, magic_result);
84
85 in6.sin6_addr.s6_addr16[0] = 0xdead;
86 in6.sin6_addr.s6_addr16[1] = 0xbeef;
87 in6.sin6_port = port_key;
88
89 for (i = 0; i < NR_TESTS; i++) {
90 printf("%s: ", test_names[i]);
91
92 in6.sin6_addr.s6_addr16[7] = i;
93 ret = connect(-1, (struct sockaddr *)&in6, sizeof(in6));
94 assert(ret == -1 && errno == EBADF);
95
96 ret = bpf_map_lookup_elem(REG_RESULT_H, &result_key, &result);
97 assert(!ret);
98
99 ret = bpf_map_lookup_elem(INLINE_RESULT_H, &result_key,
100 &inline_result);
101 assert(!ret);
102
103 if (result != magic_result || inline_result != magic_result) {
104 printf("Error. result:%d inline_result:%d\n",
105 result, inline_result);
106 exit(1);
107 }
108
109 bpf_map_delete_elem(REG_RESULT_H, &result_key);
110 bpf_map_delete_elem(INLINE_RESULT_H, &result_key);
111
112 printf("Pass\n");
113 }
114}
115
116int main(int argc, char **argv)
117{
118 struct bpf_link *link = NULL;
119 struct bpf_program *prog;
120 struct bpf_object *obj;
121 char filename[256];
122
123 snprintf(filename, sizeof(filename), "%s.bpf.o", argv[0]);
124 obj = bpf_object__open_file(filename, NULL);
125 if (libbpf_get_error(obj)) {
126 fprintf(stderr, "ERROR: opening BPF object file failed\n");
127 return 0;
128 }
129
130 prog = bpf_object__find_program_by_name(obj, "trace_sys_connect");
131 if (!prog) {
132 printf("finding a prog in obj file failed\n");
133 goto cleanup;
134 }
135
136 /* load BPF program */
137 if (bpf_object__load(obj)) {
138 fprintf(stderr, "ERROR: loading BPF object file failed\n");
139 goto cleanup;
140 }
141
142 map_fd[0] = bpf_object__find_map_fd_by_name(obj, "port_a");
143 map_fd[1] = bpf_object__find_map_fd_by_name(obj, "port_h");
144 map_fd[2] = bpf_object__find_map_fd_by_name(obj, "reg_result_h");
145 map_fd[3] = bpf_object__find_map_fd_by_name(obj, "inline_result_h");
146 map_fd[4] = bpf_object__find_map_fd_by_name(obj, "a_of_port_a");
147 map_fd[5] = bpf_object__find_map_fd_by_name(obj, "h_of_port_a");
148 map_fd[6] = bpf_object__find_map_fd_by_name(obj, "h_of_port_h");
149 if (map_fd[0] < 0 || map_fd[1] < 0 || map_fd[2] < 0 ||
150 map_fd[3] < 0 || map_fd[4] < 0 || map_fd[5] < 0 || map_fd[6] < 0) {
151 fprintf(stderr, "ERROR: finding a map in obj file failed\n");
152 goto cleanup;
153 }
154
155 link = bpf_program__attach(prog);
156 if (libbpf_get_error(link)) {
157 fprintf(stderr, "ERROR: bpf_program__attach failed\n");
158 link = NULL;
159 goto cleanup;
160 }
161
162 test_map_in_map();
163
164cleanup:
165 bpf_link__destroy(link);
166 bpf_object__close(obj);
167 return 0;
168}