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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018 Facebook
// Copyright (c) 2019 Cloudflare
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include "bpf_rlimit.h"
#include "cgroup_helpers.h"
static int start_server(const struct sockaddr *addr, socklen_t len)
{
int fd;
fd = socket(addr->sa_family, SOCK_STREAM, 0);
if (fd == -1) {
log_err("Failed to create server socket");
goto out;
}
if (bind(fd, addr, len) == -1) {
log_err("Failed to bind server socket");
goto close_out;
}
if (listen(fd, 128) == -1) {
log_err("Failed to listen on server socket");
goto close_out;
}
goto out;
close_out:
close(fd);
fd = -1;
out:
return fd;
}
static int connect_to_server(int server_fd)
{
struct sockaddr_storage addr;
socklen_t len = sizeof(addr);
int fd = -1;
if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) {
log_err("Failed to get server addr");
goto out;
}
fd = socket(addr.ss_family, SOCK_STREAM, 0);
if (fd == -1) {
log_err("Failed to create client socket");
goto out;
}
if (connect(fd, (const struct sockaddr *)&addr, len) == -1) {
log_err("Fail to connect to server");
goto close_out;
}
goto out;
close_out:
close(fd);
fd = -1;
out:
return fd;
}
static int get_map_fd_by_prog_id(int prog_id)
{
struct bpf_prog_info info = {};
__u32 info_len = sizeof(info);
__u32 map_ids[1];
int prog_fd = -1;
int map_fd = -1;
prog_fd = bpf_prog_get_fd_by_id(prog_id);
if (prog_fd < 0) {
log_err("Failed to get fd by prog id %d", prog_id);
goto err;
}
info.nr_map_ids = 1;
info.map_ids = (__u64)(unsigned long)map_ids;
if (bpf_obj_get_info_by_fd(prog_fd, &info, &info_len)) {
log_err("Failed to get info by prog fd %d", prog_fd);
goto err;
}
if (!info.nr_map_ids) {
log_err("No maps found for prog fd %d", prog_fd);
goto err;
}
map_fd = bpf_map_get_fd_by_id(map_ids[0]);
if (map_fd < 0)
log_err("Failed to get fd by map id %d", map_ids[0]);
err:
if (prog_fd >= 0)
close(prog_fd);
return map_fd;
}
static int run_test(int server_fd, int results_fd)
{
int client = -1, srv_client = -1;
int ret = 0;
__u32 key = 0;
__u64 value = 0;
if (bpf_map_update_elem(results_fd, &key, &value, 0) < 0) {
log_err("Can't clear results");
goto err;
}
client = connect_to_server(server_fd);
if (client == -1)
goto err;
srv_client = accept(server_fd, NULL, 0);
if (srv_client == -1) {
log_err("Can't accept connection");
goto err;
}
if (bpf_map_lookup_elem(results_fd, &key, &value) < 0) {
log_err("Can't lookup result");
goto err;
}
if (value != 1) {
log_err("Didn't match syncookie: %llu", value);
goto err;
}
goto out;
err:
ret = 1;
out:
close(client);
close(srv_client);
return ret;
}
int main(int argc, char **argv)
{
struct sockaddr_in addr4;
struct sockaddr_in6 addr6;
int server = -1;
int server_v6 = -1;
int results = -1;
int err = 0;
if (argc < 2) {
fprintf(stderr, "Usage: %s prog_id\n", argv[0]);
exit(1);
}
results = get_map_fd_by_prog_id(atoi(argv[1]));
if (results < 0) {
log_err("Can't get map");
goto err;
}
memset(&addr4, 0, sizeof(addr4));
addr4.sin_family = AF_INET;
addr4.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
addr4.sin_port = 0;
memset(&addr6, 0, sizeof(addr6));
addr6.sin6_family = AF_INET6;
addr6.sin6_addr = in6addr_loopback;
addr6.sin6_port = 0;
server = start_server((const struct sockaddr *)&addr4, sizeof(addr4));
if (server == -1)
goto err;
server_v6 = start_server((const struct sockaddr *)&addr6,
sizeof(addr6));
if (server_v6 == -1)
goto err;
if (run_test(server, results))
goto err;
if (run_test(server_v6, results))
goto err;
printf("ok\n");
goto out;
err:
err = 1;
out:
close(server);
close(server_v6);
close(results);
return err;
}
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