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
208
209
210
211
212
213
214
215
|
/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright (c) 2013
* Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
*/
#ifndef SLIRP_IP6_H
#define SLIRP_IP6_H
#include <glib.h>
#include <string.h>
#define ALLNODES_MULTICAST \
{ \
.s6_addr = { \
0xff, \
0x02, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x01 \
} \
}
#define SOLICITED_NODE_PREFIX \
{ \
.s6_addr = { \
0xff, \
0x02, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x01, \
0xff, \
0x00, \
0x00, \
0x00 \
} \
}
#define LINKLOCAL_ADDR \
{ \
.s6_addr = { \
0xfe, \
0x80, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x02 \
} \
}
#define ZERO_ADDR \
{ \
.s6_addr = { \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00, \
0x00 \
} \
}
static inline bool in6_equal(const struct in6_addr *a, const struct in6_addr *b)
{
return memcmp(a, b, sizeof(*a)) == 0;
}
static inline bool in6_equal_net(const struct in6_addr *a,
const struct in6_addr *b, int prefix_len)
{
if (memcmp(a, b, prefix_len / 8) != 0) {
return 0;
}
if (prefix_len % 8 == 0) {
return 1;
}
return a->s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8)) ==
b->s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8));
}
static inline bool in6_equal_mach(const struct in6_addr *a,
const struct in6_addr *b, int prefix_len)
{
if (memcmp(&(a->s6_addr[DIV_ROUND_UP(prefix_len, 8)]),
&(b->s6_addr[DIV_ROUND_UP(prefix_len, 8)]),
16 - DIV_ROUND_UP(prefix_len, 8)) != 0) {
return 0;
}
if (prefix_len % 8 == 0) {
return 1;
}
return (a->s6_addr[prefix_len / 8] &
((1U << (8 - (prefix_len % 8))) - 1)) ==
(b->s6_addr[prefix_len / 8] & ((1U << (8 - (prefix_len % 8))) - 1));
}
#define in6_equal_router(a) \
((in6_equal_net(a, &slirp->vprefix_addr6, slirp->vprefix_len) && \
in6_equal_mach(a, &slirp->vhost_addr6, slirp->vprefix_len)) || \
(in6_equal_net(a, &(struct in6_addr)LINKLOCAL_ADDR, 64) && \
in6_equal_mach(a, &slirp->vhost_addr6, 64)))
#define in6_equal_dns(a) \
((in6_equal_net(a, &slirp->vprefix_addr6, slirp->vprefix_len) && \
in6_equal_mach(a, &slirp->vnameserver_addr6, slirp->vprefix_len)) || \
(in6_equal_net(a, &(struct in6_addr)LINKLOCAL_ADDR, 64) && \
in6_equal_mach(a, &slirp->vnameserver_addr6, 64)))
#define in6_equal_host(a) (in6_equal_router(a) || in6_equal_dns(a))
#define in6_solicitednode_multicast(a) \
(in6_equal_net(a, &(struct in6_addr)SOLICITED_NODE_PREFIX, 104))
#define in6_zero(a) (in6_equal(a, &(struct in6_addr)ZERO_ADDR))
/* Compute emulated host MAC address from its ipv6 address */
static inline void in6_compute_ethaddr(struct in6_addr ip,
uint8_t eth[ETH_ALEN])
{
eth[0] = 0x52;
eth[1] = 0x56;
memcpy(ð[2], &ip.s6_addr[16 - (ETH_ALEN - 2)], ETH_ALEN - 2);
}
/*
* Definitions for internet protocol version 6.
* Per RFC 2460, December 1998.
*/
#define IP6VERSION 6
#define IP6_HOP_LIMIT 255
/*
* Structure of an internet header, naked of options.
*/
struct ip6 {
#if (G_BYTE_ORDER == G_BIG_ENDIAN) && !defined(_MSC_VER)
uint8_t ip_v : 4, /* version */
ip_tc_hi : 4; /* traffic class */
uint8_t ip_tc_lo : 4, ip_fl_hi : 4; /* flow label */
#else
uint8_t ip_tc_hi : 4, ip_v : 4;
uint8_t ip_fl_hi : 4, ip_tc_lo : 4;
#endif
uint16_t ip_fl_lo;
uint16_t ip_pl; /* payload length */
uint8_t ip_nh; /* next header */
uint8_t ip_hl; /* hop limit */
struct in6_addr ip_src, ip_dst; /* source and dest address */
};
/*
* IPv6 pseudo-header used by upper-layer protocols
*/
struct ip6_pseudohdr {
struct in6_addr ih_src; /* source internet address */
struct in6_addr ih_dst; /* destination internet address */
uint32_t ih_pl; /* upper-layer packet length */
uint16_t ih_zero_hi; /* zero */
uint8_t ih_zero_lo; /* zero */
uint8_t ih_nh; /* next header */
};
/*
* We don't want to mark these ip6 structs as packed as they are naturally
* correctly aligned; instead assert that there is no stray padding.
* If we marked the struct as packed then we would be unable to take
* the address of any of the fields in it.
*/
G_STATIC_ASSERT(sizeof(struct ip6) == 40);
G_STATIC_ASSERT(sizeof(struct ip6_pseudohdr) == 40);
#endif
|
