net/mptcp/bpf.c

// SPDX-License-Identifier: GPL-2.0
/* Multipath TCP
 *
 * Copyright (c) 2020, Tessares SA.
 * Copyright (c) 2022, SUSE.
 *
 * Author: Nicolas Rybowski <nicolas.rybowski@tessares.net>
 */

#define pr_fmt(fmt) "MPTCP: " fmt

#include <linux/bpf.h>
#include "protocol.h"

struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk)
{
	if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP && sk_is_mptcp(sk))
		return mptcp_sk(mptcp_subflow_ctx(sk)->conn);

	return NULL;
}