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