selftests/bpf: Fix erroneous bitmask operation
[platform/kernel/linux-rpi.git] / tools / testing / selftests / bpf / progs / mptcpify.c
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 }