brintos

brintos / linux-shallow public Read only

0
0
Text · 538 B · cbdc730 Raw
25 lines · c
1// SPDX-License-Identifier: GPL-2.02/* Copyright (c) 2023, SUSE. */3 4#include "vmlinux.h"5#include <bpf/bpf_tracing.h>6#include "bpf_tracing_net.h"7 8char _license[] SEC("license") = "GPL";9int pid;10 11SEC("fmod_ret/update_socket_protocol")12int BPF_PROG(mptcpify, int family, int type, int protocol)13{14	if (bpf_get_current_pid_tgid() >> 32 != pid)15		return protocol;16 17	if ((family == AF_INET || family == AF_INET6) &&18	    type == SOCK_STREAM &&19	    (!protocol || protocol == IPPROTO_TCP)) {20		return IPPROTO_MPTCP;21	}22 23	return protocol;24}25