1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/*
* Copyright (C) 2012-2017 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef IPV6_ADDRESS_HXX
#define IPV6_ADDRESS_HXX
#include "SocketAddress.hxx"
#include "system/ByteOrder.hxx"
#include "util/Compiler.h"
#include <stdint.h>
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <netinet/in.h>
#endif
/**
* An OO wrapper for struct sockaddr_in.
*/
class IPv6Address {
struct sockaddr_in6 address;
static constexpr struct in6_addr Construct(uint16_t a, uint16_t b,
uint16_t c, uint16_t d,
uint16_t e, uint16_t f,
uint16_t g, uint16_t h) noexcept {
struct in6_addr result{};
result.s6_addr[0] = a >> 8;
result.s6_addr[1] = a;
result.s6_addr[2] = b >> 8;
result.s6_addr[3] = b;
result.s6_addr[4] = c >> 8;
result.s6_addr[5] = c;
result.s6_addr[6] = d >> 8;
result.s6_addr[7] = d;
result.s6_addr[8] = e >> 8;
result.s6_addr[9] = e;
result.s6_addr[10] = f >> 8;
result.s6_addr[11] = f;
result.s6_addr[12] = g >> 8;
result.s6_addr[13] = g;
result.s6_addr[14] = h >> 8;
result.s6_addr[15] = h;
return result;
}
static constexpr struct sockaddr_in6 Construct(struct in6_addr address,
uint16_t port,
uint32_t scope_id) noexcept {
struct sockaddr_in6 sin{};
sin.sin6_family = AF_INET6;
sin.sin6_port = ToBE16(port);
sin.sin6_addr = address;
sin.sin6_scope_id = scope_id;
return sin;
}
public:
IPv6Address() = default;
constexpr IPv6Address(struct in6_addr _address, uint16_t port,
uint32_t scope_id=0) noexcept
:address(Construct(_address, port, scope_id)) {}
constexpr explicit IPv6Address(uint16_t port,
uint32_t scope_id=0) noexcept
:IPv6Address(IN6ADDR_ANY_INIT, port, scope_id) {}
constexpr IPv6Address(uint16_t a, uint16_t b, uint16_t c, uint16_t d,
uint16_t e, uint16_t f, uint16_t g, uint16_t h,
uint16_t port, uint32_t scope_id=0) noexcept
:IPv6Address(Construct(a, b, c, d, e, f, g, h),
port, scope_id) {}
/**
* Construct with data copied from a #SocketAddress. Its
* address family must be AF_INET6.
*/
explicit IPv6Address(SocketAddress src) noexcept;
/**
* Generate a (net-)mask with the specified prefix length.
*/
static constexpr IPv6Address MaskFromPrefix(unsigned prefix_length) noexcept {
return IPv6Address(MaskWord(prefix_length, 0),
MaskWord(prefix_length, 16),
MaskWord(prefix_length, 32),
MaskWord(prefix_length, 48),
MaskWord(prefix_length, 64),
MaskWord(prefix_length, 80),
MaskWord(prefix_length, 96),
MaskWord(prefix_length, 112),
~uint16_t(0),
~uint32_t(0));
}
/**
* Return a downcasted reference to the address. This call is
* only legal after verifying SocketAddress::GetFamily().
*/
static constexpr const IPv6Address &Cast(const SocketAddress &src) noexcept {
/* this reinterpret_cast works because this class is
just a wrapper for struct sockaddr_in6 */
return *(const IPv6Address *)(const void *)src.GetAddress();
}
constexpr operator SocketAddress() const noexcept {
return SocketAddress((const struct sockaddr *)&address,
sizeof(address));
}
constexpr SocketAddress::size_type GetSize() const noexcept {
return sizeof(address);
}
constexpr bool IsDefined() const noexcept {
return address.sin6_family != AF_UNSPEC;
}
constexpr bool IsValid() const noexcept {
return address.sin6_family == AF_INET6;
}
constexpr uint16_t GetPort() const noexcept {
return FromBE16(address.sin6_port);
}
void SetPort(uint16_t port) noexcept {
address.sin6_port = ToBE16(port);
}
constexpr const struct in6_addr &GetAddress() const noexcept {
return address.sin6_addr;
}
constexpr uint32_t GetScopeId() const noexcept {
return address.sin6_scope_id;
}
/**
* Is this the IPv6 wildcard address (in6addr_any)?
*/
gcc_pure
bool IsAny() const noexcept;
/**
* Is this an IPv4 address mapped inside struct sockaddr_in6?
*/
#if defined(__linux__) && !GCC_OLDER_THAN(5,0)
constexpr
#endif
bool IsV4Mapped() const noexcept {
return IN6_IS_ADDR_V4MAPPED(&address.sin6_addr);
}
/**
* Bit-wise AND of two addresses. This is useful for netmask
* calculations.
*/
gcc_pure
IPv6Address operator&(const IPv6Address &other) const;
private:
/**
* Helper function for MaskFromPrefix().
*/
static constexpr uint16_t MaskWord(unsigned prefix_length,
unsigned offset) noexcept {
return prefix_length <= offset
? 0
: (prefix_length >= offset + 16
? 0xffff
: (0xffff << (offset + 16 - prefix_length)));
}
};
#endif
|
