2018-07-31 08:42:31 +08:00
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2018 Facebook
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#include <string.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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#include "bpf_rlimit.h"
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#include "cgroup_helpers.h"
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#define CG_PATH "/foo"
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#define SOCKET_COOKIE_PROG "./socket_cookie_prog.o"
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static int start_server(void)
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{
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struct sockaddr_in6 addr;
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int fd;
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fd = socket(AF_INET6, SOCK_STREAM, 0);
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if (fd == -1) {
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log_err("Failed to create server socket");
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goto out;
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}
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memset(&addr, 0, sizeof(addr));
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addr.sin6_family = AF_INET6;
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addr.sin6_addr = in6addr_loopback;
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addr.sin6_port = 0;
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if (bind(fd, (const struct sockaddr *)&addr, sizeof(addr)) == -1) {
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log_err("Failed to bind server socket");
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goto close_out;
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}
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if (listen(fd, 128) == -1) {
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log_err("Failed to listen on server socket");
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goto close_out;
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}
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goto out;
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close_out:
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close(fd);
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fd = -1;
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out:
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return fd;
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}
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static int connect_to_server(int server_fd)
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{
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struct sockaddr_storage addr;
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socklen_t len = sizeof(addr);
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int fd;
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fd = socket(AF_INET6, SOCK_STREAM, 0);
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if (fd == -1) {
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log_err("Failed to create client socket");
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goto out;
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}
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if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) {
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log_err("Failed to get server addr");
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goto close_out;
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}
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if (connect(fd, (const struct sockaddr *)&addr, len) == -1) {
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log_err("Fail to connect to server");
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goto close_out;
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}
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goto out;
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close_out:
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close(fd);
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fd = -1;
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out:
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return fd;
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}
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static int validate_map(struct bpf_map *map, int client_fd)
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{
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__u32 cookie_expected_value;
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struct sockaddr_in6 addr;
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socklen_t len = sizeof(addr);
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__u32 cookie_value;
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__u64 cookie_key;
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int err = 0;
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int map_fd;
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if (!map) {
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log_err("Map not found in BPF object");
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goto err;
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}
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map_fd = bpf_map__fd(map);
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err = bpf_map_get_next_key(map_fd, NULL, &cookie_key);
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if (err) {
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log_err("Can't get cookie key from map");
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goto out;
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}
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err = bpf_map_lookup_elem(map_fd, &cookie_key, &cookie_value);
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if (err) {
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log_err("Can't get cookie value from map");
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goto out;
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}
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err = getsockname(client_fd, (struct sockaddr *)&addr, &len);
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if (err) {
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log_err("Can't get client local addr");
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goto out;
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}
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cookie_expected_value = (ntohs(addr.sin6_port) << 8) | 0xFF;
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if (cookie_value != cookie_expected_value) {
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log_err("Unexpected value in map: %x != %x", cookie_value,
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cookie_expected_value);
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goto err;
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}
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goto out;
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err:
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err = -1;
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out:
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return err;
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}
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static int run_test(int cgfd)
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{
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enum bpf_attach_type attach_type;
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struct bpf_prog_load_attr attr;
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struct bpf_program *prog;
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struct bpf_object *pobj;
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const char *prog_name;
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int server_fd = -1;
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int client_fd = -1;
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int prog_fd = -1;
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int err = 0;
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memset(&attr, 0, sizeof(attr));
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attr.file = SOCKET_COOKIE_PROG;
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attr.prog_type = BPF_PROG_TYPE_UNSPEC;
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err = bpf_prog_load_xattr(&attr, &pobj, &prog_fd);
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if (err) {
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log_err("Failed to load %s", attr.file);
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goto out;
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}
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bpf_object__for_each_program(prog, pobj) {
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prog_name = bpf_program__title(prog, /*needs_copy*/ false);
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2019-01-21 21:06:38 +08:00
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if (libbpf_attach_type_by_name(prog_name, &attach_type))
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2018-07-31 08:42:31 +08:00
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goto err;
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err = bpf_prog_attach(bpf_program__fd(prog), cgfd, attach_type,
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BPF_F_ALLOW_OVERRIDE);
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if (err) {
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log_err("Failed to attach prog %s", prog_name);
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goto out;
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}
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}
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server_fd = start_server();
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if (server_fd == -1)
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goto err;
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client_fd = connect_to_server(server_fd);
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if (client_fd == -1)
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goto err;
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if (validate_map(bpf_map__next(NULL, pobj), client_fd))
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goto err;
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goto out;
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err:
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err = -1;
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out:
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close(client_fd);
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close(server_fd);
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bpf_object__close(pobj);
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printf("%s\n", err ? "FAILED" : "PASSED");
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return err;
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}
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int main(int argc, char **argv)
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{
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int cgfd = -1;
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int err = 0;
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if (setup_cgroup_environment())
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goto err;
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cgfd = create_and_get_cgroup(CG_PATH);
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2019-01-08 01:46:46 +08:00
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if (cgfd < 0)
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2018-07-31 08:42:31 +08:00
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goto err;
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if (join_cgroup(CG_PATH))
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goto err;
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if (run_test(cgfd))
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goto err;
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goto out;
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err:
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err = -1;
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out:
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close(cgfd);
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cleanup_cgroup_environment();
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return err;
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}
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