1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2023, SUSE. */ 3 4 #include "vmlinux.h" 5 #include <bpf/bpf_tracing.h> 6 #include "bpf_tracing_net.h" 7 8 char _license[] SEC("license") = "GPL"; 9 10 SEC("fmod_ret/update_socket_protocol") 11 int BPF_PROG(mptcpify, int family, int type, int protocol) 12 { 13 if ((family == AF_INET || family == AF_INET6) && 14 type == SOCK_STREAM && 15 (!protocol || protocol == IPPROTO_TCP)) { 16 return IPPROTO_MPTCP; 17 } 18 19 return protocol; 20 } 21