| 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 |