// 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; }