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 int pid;
10
11 SEC("fmod_ret/update_socket_protocol")
12 int 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
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