1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19
20 #pragma once
21
22 #include <functional>
23
24 #include <linux/if_ether.h>
25 #include <stdint.h>
26 #include <string.h>
27
28 struct MacAddress {
29 uint8_t addr[ETH_ALEN];
isBroadcastMacAddress30 bool isBroadcast() const {
31 return memcmp(addr, "\xFF\xFF\xFF\xFF\xFF\xFF", ETH_ALEN) == 0;
32 }
33 } __attribute__((__packed__));
34
35 template<class T>
hash_combine(size_t & seed,const T & value)36 inline void hash_combine(size_t& seed, const T& value) {
37 std::hash<T> hasher;
38 seed ^= hasher(value) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
39 }
40
41 namespace std {
42 template<> struct hash<MacAddress> {
43 size_t operator()(const MacAddress& addr) const {
44 size_t seed = 0;
45 // Treat the first 4 bytes as an uint32_t to save some computation
46 hash_combine(seed, *reinterpret_cast<const uint32_t*>(addr.addr));
47 // And the remaining 2 bytes as an uint16_t
48 hash_combine(seed, *reinterpret_cast<const uint16_t*>(addr.addr + 4));
49 return seed;
50 }
51 };
52 }
53
54