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/*
* Copyright (C) 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
/* -=-=-=-=-= WARNING -=-=-=-=-=-
*
* DO *NOT* *EVER* CHANGE THIS CONSTANT
*
* This is aidl::android::net::INetd::CLAT_MARK but we can't use that from
* pure C code (ie. the eBPF clat program).
*
* It must match the iptables rules setup by netd on Android T.
*
* This mark value is used by the eBPF clatd program to mark ingress non-offloaded clat
* packets for later dropping in ip6tables bw_raw_PREROUTING.
* They need to be dropped *after* the clat daemon (via receive on an AF_PACKET socket)
* sees them and thus cannot be dropped from the bpf program itself.
*/
static const uint32_t CLAT_MARK = 0xDEADC1A7;
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