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
| | /* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright Red Hat
* Author: David Gibson <david@gibson.dropbear.id.au>
*
* inany.h - Types and helpers for handling addresses which could be
* IPv6 or IPv4 (encoded as IPv4-mapped IPv6 addresses)
*/
#ifndef INANY_H
#define INANY_H
/** union inany_addr - Represents either an IPv4 or IPv6 address
* @a6: Address as an IPv6 address, may be IPv4-mapped
* @v4mapped.zero: All zero-bits for an IPv4 address
* @v4mapped.one: All one-bits for an IPv4 address
* @v4mapped.a4: If @a6 is an IPv4 mapped address, the IPv4 address
* @u64: As an array of u64s (solely for hashing)
*
* @v4mapped and @u64 shouldn't be accessed except via helpers.
*/
union inany_addr {
struct in6_addr a6;
struct {
uint8_t zero[10];
uint8_t one[2];
struct in_addr a4;
} v4mapped;
uint32_t u32[4];
};
static_assert(sizeof(union inany_addr) == sizeof(struct in6_addr),
"union inany_addr is larger than an IPv6 address");
static_assert(_Alignof(union inany_addr) == _Alignof(uint32_t),
"union inany_addr has unexpected alignment");
#define inany_loopback6 (*(const union inany_addr *)(&in6addr_loopback))
extern const union inany_addr inany_loopback4;
#define inany_any6 (*(const union inany_addr *)(&in6addr_any))
extern const union inany_addr inany_any4;
#define in4addr_loopback (inany_loopback4.v4mapped.a4)
#define in4addr_any (inany_any4.v4mapped.a4)
/** inany_v4 - Extract IPv4 address, if present, from IPv[46] address
* @addr: IPv4 or IPv6 address
*
* Return: IPv4 address if @addr is IPv4, NULL otherwise
*/
static inline struct in_addr *inany_v4(const union inany_addr *addr)
{
if (!IN6_IS_ADDR_V4MAPPED(&addr->a6))
return NULL;
return (struct in_addr *)&addr->v4mapped.a4;
}
/** inany_equals - Compare two IPv[46] addresses
* @a, @b: IPv[46] addresses
*
* Return: true if @a and @b are the same address
*/
static inline bool inany_equals(const union inany_addr *a,
const union inany_addr *b)
{
return IN6_ARE_ADDR_EQUAL(&a->a6, &b->a6);
}
/** inany_is_loopback() - Check if address is loopback
* @a: IPv[46] address
*
* Return: true if @a is either ::1 or in 127.0.0.1/8
*/
static inline bool inany_is_loopback(const union inany_addr *a)
{
const struct in_addr *v4 = inany_v4(a);
return IN6_IS_ADDR_LOOPBACK(&a->a6) || (v4 && IN4_IS_ADDR_LOOPBACK(v4));
}
/** inany_is_unspecified() - Check if address is unspecified
* @a: IPv[46] address
*
* Return: true if @a is either :: or 0.0.0.0
*/
static inline bool inany_is_unspecified(const union inany_addr *a)
{
const struct in_addr *v4 = inany_v4(a);
return IN6_IS_ADDR_UNSPECIFIED(&a->a6) ||
(v4 && IN4_IS_ADDR_UNSPECIFIED(v4));
}
/** inany_is_multicast() - Check if address is multicast or broadcast
* @a: IPv[46] address
*
* Return: true if @a is IPv6 multicast or IPv4 multicast or broadcast
*/
static inline bool inany_is_multicast(const union inany_addr *a)
{
const struct in_addr *v4 = inany_v4(a);
return IN6_IS_ADDR_MULTICAST(&a->a6) ||
(v4 && (IN4_IS_ADDR_MULTICAST(v4) ||
IN4_IS_ADDR_BROADCAST(v4)));
}
/** inany_is_unicast() - Check if address is specified and unicast
* @a: IPv[46] address
*
* Return: true if @a is specified and a unicast address
*/
/* cppcheck-suppress unusedFunction */
static inline bool inany_is_unicast(const union inany_addr *a)
{
return !inany_is_unspecified(a) && !inany_is_multicast(a);
}
/** inany_from_af - Set IPv[46] address from IPv4 or IPv6 address
* @aa: Pointer to store IPv[46] address
* @af: Address family of @addr
* @addr: struct in_addr (IPv4) or struct in6_addr (IPv6)
*/
static inline void inany_from_af(union inany_addr *aa,
sa_family_t af, const void *addr)
{
if (af == AF_INET6) {
aa->a6 = *((struct in6_addr *)addr);
} else if (af == AF_INET) {
memset(&aa->v4mapped.zero, 0, sizeof(aa->v4mapped.zero));
memset(&aa->v4mapped.one, 0xff, sizeof(aa->v4mapped.one));
aa->v4mapped.a4 = *((struct in_addr *)addr);
} else {
/* Not valid to call with other address families */
ASSERT(0);
}
}
/** inany_from_sockaddr - Extract IPv[46] address and port number from sockaddr
* @aa: Pointer to store IPv[46] address
* @port: Pointer to store port number, host order
* @addr: struct sockaddr_in (IPv4) or struct sockaddr_in6 (IPv6)
*/
static inline void inany_from_sockaddr(union inany_addr *aa, in_port_t *port,
const void *addr)
{
const struct sockaddr *sa = (const struct sockaddr *)addr;
if (sa->sa_family == AF_INET6) {
struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa;
inany_from_af(aa, AF_INET6, &sa6->sin6_addr);
*port = ntohs(sa6->sin6_port);
} else if (sa->sa_family == AF_INET) {
struct sockaddr_in *sa4 = (struct sockaddr_in *)sa;
inany_from_af(aa, AF_INET, &sa4->sin_addr);
*port = ntohs(sa4->sin_port);
} else {
/* Not valid to call with other address families */
ASSERT(0);
}
}
/** inany_siphash_feed- Fold IPv[46] address into an in-progress siphash
* @state: siphash state
* @aa: inany to hash
*/
static inline void inany_siphash_feed(struct siphash_state *state,
const union inany_addr *aa)
{
siphash_feed(state, (uint64_t)aa->u32[0] << 32 | aa->u32[1]);
siphash_feed(state, (uint64_t)aa->u32[2] << 32 | aa->u32[3]);
}
#define INANY_ADDRSTRLEN MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN)
const char *inany_ntop(const union inany_addr *src, char *dst, socklen_t size);
#endif /* INANY_H */
|