1// SPDX-License-Identifier: GPL-2.0
 2/* Multipath TCP
 3 *
 4 * Copyright (c) 2020, Tessares SA.
 5 * Copyright (c) 2022, SUSE.
 6 *
 7 * Author: Nicolas Rybowski <nicolas.rybowski@tessares.net>
 8 */
 9
10#define pr_fmt(fmt) "MPTCP: " fmt
11
12#include <linux/bpf.h>
13#include "protocol.h"
14
15struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk)
16{
17	if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP && sk_is_mptcp(sk))
18		return mptcp_sk(mptcp_subflow_ctx(sk)->conn);
19
20	return NULL;
21}