Seastar
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ip_checksum.hh
1/*
2 * This file is open source software, licensed to you under the terms
3 * of the Apache License, Version 2.0 (the "License"). See the NOTICE file
4 * distributed with this work for additional information regarding copyright
5 * ownership. You may not use this file except in compliance with the License.
6 *
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing,
12 * software distributed under the License is distributed on an
13 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14 * KIND, either express or implied. See the License for the
15 * specific language governing permissions and limitations
16 * under the License.
17 */
18/*
19 * Copyright (C) 2014 Cloudius Systems, Ltd.
20 */
21
22#pragma once
23
24#include <seastar/net/packet.hh>
25#include <seastar/util/modules.hh>
26#ifndef SEASTAR_MODULE
27#include <cstdint>
28#include <cstddef>
29#include <arpa/inet.h>
30#endif
31
32namespace seastar {
33
34namespace net {
35
36uint16_t ip_checksum(const void* data, size_t len);
37
39 __int128 csum = 0;
40 bool odd = false;
41 void sum(const char* data, size_t len);
42 void sum(const packet& p);
43 void sum(uint8_t data) {
44 if (!odd) {
45 csum += data << 8;
46 } else {
47 csum += data;
48 }
49 odd = !odd;
50 }
51 void sum(uint16_t data) {
52 if (odd) {
53 sum(uint8_t(data >> 8));
54 sum(uint8_t(data));
55 } else {
56 csum += data;
57 }
58 }
59 void sum(uint32_t data) {
60 if (odd) {
61 sum(uint16_t(data));
62 sum(uint16_t(data >> 16));
63 } else {
64 csum += data;
65 }
66 }
67 void sum_many() {}
68 template <typename T0, typename... T>
69 void sum_many(T0 data, T... rest) {
70 sum(data);
71 sum_many(rest...);
72 }
73 uint16_t get() const;
74};
75
76}
77
78}
79
Definition: packet.hh:87
Seastar API namespace.
Definition: abort_on_ebadf.hh:26
Definition: ip_checksum.hh:38