summaryrefslogtreecommitdiffstats
path: root/slirp/ip6.h
blob: 8ddfa242c4c21a1d6e776c1fb2e428bec77ed22e (plain) (blame)
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
/*
 * Copyright (c) 2013
 * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
 */

#ifndef SLIRP_IP6_H_
#define SLIRP_IP6_H_

#include "net/eth.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 } }

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[(prefix_len + 7) / 8]),
               &(b->s6_addr[(prefix_len + 7) / 8]),
               16 - (prefix_len + 7) / 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))

/* 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(&eth[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 {
#ifdef HOST_WORDS_BIGENDIAN
    uint32_t
        ip_v:4,         /* version */
        ip_tc_hi:4,     /* traffic class */
        ip_tc_lo:4,
        ip_fl_hi:4,     /* flow label */
        ip_fl_lo:16;
#else
    uint32_t
        ip_tc_hi:4,
        ip_v:4,
        ip_fl_hi:4,
        ip_tc_lo:4,
        ip_fl_lo:16;
#endif
    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 */
} QEMU_PACKED;

/*
 * 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 */
} QEMU_PACKED;


#endif