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