169 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2017 Facebook4 */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}169