bb57fa9eec
The folder is currently used by tether offload only. Because we will move netd.c and clatd.c to it, the folder should be moved to the upper tier. Also, rename bpf_tethering_headers to bpf_connectivity_headers so that other connectivity code besides to tethering are justified to use it. Bug: 202086915 Test: atest FrameworksNetTests Change-Id: I95943c6e909f1fdca12604ef0c55d67c39ca686b
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/*
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* Copyright (C) 2021 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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#include <linux/if_ether.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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// The resulting .o needs to load on the Android S bpfloader v0.2
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#define BPFLOADER_MIN_VER 2u
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#include "bpf_helpers.h"
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#include "bpf_net_helpers.h"
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#include "bpf_tethering.h"
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// Used only by TetheringPrivilegedTests, not by production code.
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DEFINE_BPF_MAP_GRW(tether_downstream6_map, HASH, TetherDownstream6Key, Tether6Value, 16,
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AID_NETWORK_STACK)
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DEFINE_BPF_PROG_KVER("xdp/drop_ipv4_udp_ether", AID_ROOT, AID_NETWORK_STACK,
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xdp_test, KVER(5, 9, 0))
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(struct xdp_md *ctx) {
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void *data = (void *)(long)ctx->data;
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void *data_end = (void *)(long)ctx->data_end;
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struct ethhdr *eth = data;
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int hsize = sizeof(*eth);
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struct iphdr *ip = data + hsize;
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hsize += sizeof(struct iphdr);
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if (data + hsize > data_end) return XDP_PASS;
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if (eth->h_proto != htons(ETH_P_IP)) return XDP_PASS;
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if (ip->protocol == IPPROTO_UDP) return XDP_DROP;
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return XDP_PASS;
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}
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LICENSE("Apache 2.0");
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