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// 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";
int pid;
SEC("fmod_ret/update_socket_protocol")
int BPF_PROG(mptcpify, int family, int type, int protocol)
{
if (bpf_get_current_pid_tgid() >> 32 != pid)
return protocol;
if ((family == AF_INET || family == AF_INET6) &&
type == SOCK_STREAM &&
(!protocol || protocol == IPPROTO_TCP)) {
return IPPROTO_MPTCP;
}
return protocol;
}
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