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![Daniel T. Lee](/assets/img/avatar_default.png)
From commit 646f02ffdd
("libbpf: Add BTF-defined map-in-map
support"), a way to define internal map in BTF-defined map has been
added.
Instead of using previous 'inner_map_idx' definition, the structure to
be used for the inner map can be directly defined using array directive.
__array(values, struct inner_map)
This commit refactors map in map test program with libbpf by explicitly
defining inner map with BTF-defined format.
Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200707184855.30968-3-danieltimlee@gmail.com
173 lines
4.4 KiB
C
173 lines
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2017 Facebook
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*/
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#include <sys/resource.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <stdint.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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static int map_fd[7];
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#define PORT_A (map_fd[0])
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#define PORT_H (map_fd[1])
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#define REG_RESULT_H (map_fd[2])
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#define INLINE_RESULT_H (map_fd[3])
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#define A_OF_PORT_A (map_fd[4]) /* Test case #0 */
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#define H_OF_PORT_A (map_fd[5]) /* Test case #1 */
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#define H_OF_PORT_H (map_fd[6]) /* Test case #2 */
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static const char * const test_names[] = {
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"Array of Array",
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"Hash of Array",
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"Hash of Hash",
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};
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#define NR_TESTS (sizeof(test_names) / sizeof(*test_names))
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static void check_map_id(int inner_map_fd, int map_in_map_fd, uint32_t key)
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{
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struct bpf_map_info info = {};
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uint32_t info_len = sizeof(info);
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int ret, id;
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ret = bpf_obj_get_info_by_fd(inner_map_fd, &info, &info_len);
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assert(!ret);
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ret = bpf_map_lookup_elem(map_in_map_fd, &key, &id);
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assert(!ret);
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assert(id == info.id);
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}
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static void populate_map(uint32_t port_key, int magic_result)
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{
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int ret;
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ret = bpf_map_update_elem(PORT_A, &port_key, &magic_result, BPF_ANY);
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assert(!ret);
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ret = bpf_map_update_elem(PORT_H, &port_key, &magic_result,
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BPF_NOEXIST);
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assert(!ret);
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ret = bpf_map_update_elem(A_OF_PORT_A, &port_key, &PORT_A, BPF_ANY);
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assert(!ret);
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check_map_id(PORT_A, A_OF_PORT_A, port_key);
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ret = bpf_map_update_elem(H_OF_PORT_A, &port_key, &PORT_A, BPF_NOEXIST);
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assert(!ret);
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check_map_id(PORT_A, H_OF_PORT_A, port_key);
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ret = bpf_map_update_elem(H_OF_PORT_H, &port_key, &PORT_H, BPF_NOEXIST);
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assert(!ret);
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check_map_id(PORT_H, H_OF_PORT_H, port_key);
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}
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static void test_map_in_map(void)
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{
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struct sockaddr_in6 in6 = { .sin6_family = AF_INET6 };
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uint32_t result_key = 0, port_key;
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int result, inline_result;
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int magic_result = 0xfaceb00c;
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int ret;
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int i;
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port_key = rand() & 0x00FF;
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populate_map(port_key, magic_result);
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in6.sin6_addr.s6_addr16[0] = 0xdead;
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in6.sin6_addr.s6_addr16[1] = 0xbeef;
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in6.sin6_port = port_key;
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for (i = 0; i < NR_TESTS; i++) {
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printf("%s: ", test_names[i]);
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in6.sin6_addr.s6_addr16[7] = i;
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ret = connect(-1, (struct sockaddr *)&in6, sizeof(in6));
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assert(ret == -1 && errno == EBADF);
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ret = bpf_map_lookup_elem(REG_RESULT_H, &result_key, &result);
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assert(!ret);
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ret = bpf_map_lookup_elem(INLINE_RESULT_H, &result_key,
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&inline_result);
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assert(!ret);
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if (result != magic_result || inline_result != magic_result) {
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printf("Error. result:%d inline_result:%d\n",
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result, inline_result);
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exit(1);
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}
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bpf_map_delete_elem(REG_RESULT_H, &result_key);
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bpf_map_delete_elem(INLINE_RESULT_H, &result_key);
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printf("Pass\n");
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}
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}
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int main(int argc, char **argv)
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{
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struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
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struct bpf_link *link = NULL;
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struct bpf_program *prog;
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struct bpf_object *obj;
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char filename[256];
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if (setrlimit(RLIMIT_MEMLOCK, &r)) {
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perror("setrlimit(RLIMIT_MEMLOCK)");
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return 1;
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}
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snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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obj = bpf_object__open_file(filename, NULL);
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if (libbpf_get_error(obj)) {
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fprintf(stderr, "ERROR: opening BPF object file failed\n");
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return 0;
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}
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prog = bpf_object__find_program_by_name(obj, "trace_sys_connect");
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if (!prog) {
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printf("finding a prog in obj file failed\n");
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goto cleanup;
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}
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/* load BPF program */
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if (bpf_object__load(obj)) {
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fprintf(stderr, "ERROR: loading BPF object file failed\n");
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goto cleanup;
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}
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map_fd[0] = bpf_object__find_map_fd_by_name(obj, "port_a");
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map_fd[1] = bpf_object__find_map_fd_by_name(obj, "port_h");
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map_fd[2] = bpf_object__find_map_fd_by_name(obj, "reg_result_h");
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map_fd[3] = bpf_object__find_map_fd_by_name(obj, "inline_result_h");
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map_fd[4] = bpf_object__find_map_fd_by_name(obj, "a_of_port_a");
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map_fd[5] = bpf_object__find_map_fd_by_name(obj, "h_of_port_a");
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map_fd[6] = bpf_object__find_map_fd_by_name(obj, "h_of_port_h");
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if (map_fd[0] < 0 || map_fd[1] < 0 || map_fd[2] < 0 ||
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map_fd[3] < 0 || map_fd[4] < 0 || map_fd[5] < 0 || map_fd[6] < 0) {
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fprintf(stderr, "ERROR: finding a map in obj file failed\n");
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goto cleanup;
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}
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link = bpf_program__attach(prog);
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if (libbpf_get_error(link)) {
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fprintf(stderr, "ERROR: bpf_program__attach failed\n");
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link = NULL;
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goto cleanup;
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}
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test_map_in_map();
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cleanup:
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bpf_link__destroy(link);
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bpf_object__close(obj);
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return 0;
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}
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