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selftests/bpf: Add mptcpify test

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Implement a new test program mptcpify: if the family is AF_INET or
AF_INET6, the type is SOCK_STREAM, and the protocol ID is 0 or
IPPROTO_TCP, set it to IPPROTO_MPTCP. It will be hooked in
update_socket_protocol().

Extend the MPTCP test base, add a selftest test_mptcpify() for the
mptcpify case. Open and load the mptcpify test prog to mptcpify the
TCP sockets dynamically, then use start_server() and connect_to_fd()
to create a TCP socket, but actually what's created is an MPTCP
socket, which can be verified through 'getsockopt(SOL_PROTOCOL)'
and 'getsockopt(MPTCP_INFO)'.

Acked-by: Yonghong Song <yonghong.song@linux.dev>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Link: https://lore.kernel.org/r/364e72f307e7bb38382ec7442c182d76298a9c41.1692147782.git.geliang.tang@suse.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Geliang Tang 2023-08-16 09:11:59 +08:00 committed by Martin KaFai Lau
parent 2077465502
commit ddba122428
2 changed files with 161 additions and 0 deletions
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141
tools/testing/selftests/bpf/prog_tests/mptcp.c
View file

@ -2,17 +2,59 @@
/* Copyright (c) 2020, Tessares SA. */
/* Copyright (c) 2022, SUSE. */
#include <linux/const.h>
#include <netinet/in.h>
#include <test_progs.h>
#include "cgroup_helpers.h"
#include "network_helpers.h"
#include "mptcp_sock.skel.h"
#include "mptcpify.skel.h"
#define NS_TEST "mptcp_ns"
#ifndef IPPROTO_MPTCP
#define IPPROTO_MPTCP 262
#endif
#ifndef SOL_MPTCP
#define SOL_MPTCP 284
#endif
#ifndef MPTCP_INFO
#define MPTCP_INFO 1
#endif
#ifndef MPTCP_INFO_FLAG_FALLBACK
#define MPTCP_INFO_FLAG_FALLBACK _BITUL(0)
#endif
#ifndef MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED
#define MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED _BITUL(1)
#endif
#ifndef TCP_CA_NAME_MAX
#define TCP_CA_NAME_MAX 16
#endif
struct __mptcp_info {
__u8 mptcpi_subflows;
__u8 mptcpi_add_addr_signal;
__u8 mptcpi_add_addr_accepted;
__u8 mptcpi_subflows_max;
__u8 mptcpi_add_addr_signal_max;
__u8 mptcpi_add_addr_accepted_max;
__u32 mptcpi_flags;
__u32 mptcpi_token;
__u64 mptcpi_write_seq;
__u64 mptcpi_snd_una;
__u64 mptcpi_rcv_nxt;
__u8 mptcpi_local_addr_used;
__u8 mptcpi_local_addr_max;
__u8 mptcpi_csum_enabled;
__u32 mptcpi_retransmits;
__u64 mptcpi_bytes_retrans;
__u64 mptcpi_bytes_sent;
__u64 mptcpi_bytes_received;
__u64 mptcpi_bytes_acked;
};
struct mptcp_storage {
__u32 invoked;
__u32 is_mptcp;
@ -183,8 +225,107 @@ static void test_base(void)
close(cgroup_fd);
}
static void send_byte(int fd)
{
char b = 0x55;
ASSERT_EQ(write(fd, &b, sizeof(b)), 1, "send single byte");
}
static int verify_mptcpify(int server_fd, int client_fd)
{
struct __mptcp_info info;
socklen_t optlen;
int protocol;
int err = 0;
optlen = sizeof(protocol);
if (!ASSERT_OK(getsockopt(server_fd, SOL_SOCKET, SO_PROTOCOL, &protocol, &optlen),
"getsockopt(SOL_PROTOCOL)"))
return -1;
if (!ASSERT_EQ(protocol, IPPROTO_MPTCP, "protocol isn't MPTCP"))
err++;
optlen = sizeof(info);
if (!ASSERT_OK(getsockopt(client_fd, SOL_MPTCP, MPTCP_INFO, &info, &optlen),
"getsockopt(MPTCP_INFO)"))
return -1;
if (!ASSERT_GE(info.mptcpi_flags, 0, "unexpected mptcpi_flags"))
err++;
if (!ASSERT_FALSE(info.mptcpi_flags & MPTCP_INFO_FLAG_FALLBACK,
"MPTCP fallback"))
err++;
if (!ASSERT_TRUE(info.mptcpi_flags & MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED,
"no remote key received"))
err++;
return err;
}
static int run_mptcpify(int cgroup_fd)
{
int server_fd, client_fd, err = 0;
struct mptcpify *mptcpify_skel;
mptcpify_skel = mptcpify__open_and_load();
if (!ASSERT_OK_PTR(mptcpify_skel, "skel_open_load"))
return libbpf_get_error(mptcpify_skel);
err = mptcpify__attach(mptcpify_skel);
if (!ASSERT_OK(err, "skel_attach"))
goto out;
/* without MPTCP */
server_fd = start_server(AF_INET, SOCK_STREAM, NULL, 0, 0);
if (!ASSERT_GE(server_fd, 0, "start_server")) {
err = -EIO;
goto out;
}
client_fd = connect_to_fd(server_fd, 0);
if (!ASSERT_GE(client_fd, 0, "connect to fd")) {
err = -EIO;
goto close_server;
}
send_byte(client_fd);
err = verify_mptcpify(server_fd, client_fd);
close(client_fd);
close_server:
close(server_fd);
out:
mptcpify__destroy(mptcpify_skel);
return err;
}
static void test_mptcpify(void)
{
struct nstoken *nstoken = NULL;
int cgroup_fd;
cgroup_fd = test__join_cgroup("/mptcpify");
if (!ASSERT_GE(cgroup_fd, 0, "test__join_cgroup"))
return;
nstoken = create_netns();
if (!ASSERT_OK_PTR(nstoken, "create_netns"))
goto fail;
ASSERT_OK(run_mptcpify(cgroup_fd), "run_mptcpify");
fail:
cleanup_netns(nstoken);
close(cgroup_fd);
}
void test_mptcp(void)
{
if (test__start_subtest("base"))
test_base();
if (test__start_subtest("mptcpify"))
test_mptcpify();
}

20
tools/testing/selftests/bpf/progs/mptcpify.c Normal file
View file

@ -0,0 +1,20 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023, SUSE. */
#include "vmlinux.h"
#include <bpf/bpf_tracing.h>
#include "bpf_tracing_net.h"
char _license[] SEC("license") = "GPL";
SEC("fmod_ret/update_socket_protocol")
int BPF_PROG(mptcpify, int family, int type, int protocol)
{
if ((family == AF_INET || family == AF_INET6) &&
type == SOCK_STREAM &&
(!protocol || protocol == IPPROTO_TCP)) {
return IPPROTO_MPTCP;
}
return protocol;
}