diff options
Diffstat (limited to 'samples/bpf/test_map_in_map_user.c')
| -rw-r--r-- | samples/bpf/test_map_in_map_user.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/samples/bpf/test_map_in_map_user.c b/samples/bpf/test_map_in_map_user.c new file mode 100644 index 000000000..652ec7205 --- /dev/null +++ b/samples/bpf/test_map_in_map_user.c @@ -0,0 +1,168 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2017 Facebook + */ +#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> + +#include "bpf_util.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 ARRAY_SIZE(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; +} |