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