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0d6ff71a GS |
1 | /* |
2 | * Copyright (c) 2013 | |
3 | * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne. | |
4 | */ | |
5 | ||
6 | #ifndef SLIRP_IP6_H_ | |
7 | #define SLIRP_IP6_H_ | |
8 | ||
9 | #include "net/eth.h" | |
10 | ||
11 | #define ALLNODES_MULTICAST { .s6_addr = \ | |
12 | { 0xff, 0x02, 0x00, 0x00,\ | |
13 | 0x00, 0x00, 0x00, 0x00,\ | |
14 | 0x00, 0x00, 0x00, 0x00,\ | |
15 | 0x00, 0x00, 0x00, 0x01 } } | |
16 | ||
17 | #define SOLICITED_NODE_PREFIX { .s6_addr = \ | |
18 | { 0xff, 0x02, 0x00, 0x00,\ | |
19 | 0x00, 0x00, 0x00, 0x00,\ | |
20 | 0x00, 0x00, 0x00, 0x01,\ | |
21 | 0xff, 0x00, 0x00, 0x00 } } | |
22 | ||
23 | #define LINKLOCAL_ADDR { .s6_addr = \ | |
24 | { 0xfe, 0x80, 0x00, 0x00,\ | |
25 | 0x00, 0x00, 0x00, 0x00,\ | |
26 | 0x00, 0x00, 0x00, 0x00,\ | |
27 | 0x00, 0x00, 0x00, 0x02 } } | |
28 | ||
29 | static inline bool in6_equal(const struct in6_addr *a, const struct in6_addr *b) | |
30 | { | |
31 | return memcmp(a, b, sizeof(*a)) == 0; | |
32 | } | |
33 | ||
34 | static inline bool in6_equal_net(const struct in6_addr *a, | |
35 | const struct in6_addr *b, | |
36 | int prefix_len) | |
37 | { | |
38 | if (memcmp(a, b, prefix_len / 8) != 0) { | |
39 | return 0; | |
40 | } | |
41 | ||
42 | if (prefix_len % 8 == 0) { | |
43 | return 1; | |
44 | } | |
45 | ||
46 | return a->s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8)) | |
47 | == b->s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8)); | |
48 | } | |
49 | ||
50 | static inline bool in6_equal_mach(const struct in6_addr *a, | |
51 | const struct in6_addr *b, | |
52 | int prefix_len) | |
53 | { | |
54 | if (memcmp(&(a->s6_addr[(prefix_len + 7) / 8]), | |
55 | &(b->s6_addr[(prefix_len + 7) / 8]), | |
56 | 16 - (prefix_len + 7) / 8) != 0) { | |
57 | return 0; | |
58 | } | |
59 | ||
60 | if (prefix_len % 8 == 0) { | |
61 | return 1; | |
62 | } | |
63 | ||
64 | return (a->s6_addr[prefix_len / 8] & ((1U << (8 - (prefix_len % 8))) - 1)) | |
65 | == (b->s6_addr[prefix_len / 8] & ((1U << (8 - (prefix_len % 8))) - 1)); | |
66 | } | |
67 | ||
68 | ||
69 | #define in6_equal_router(a)\ | |
70 | ((in6_equal_net(a, &slirp->vprefix_addr6, slirp->vprefix_len)\ | |
71 | && in6_equal_mach(a, &slirp->vhost_addr6, slirp->vprefix_len))\ | |
72 | || (in6_equal_net(a, &(struct in6_addr)LINKLOCAL_ADDR, 64)\ | |
73 | && in6_equal_mach(a, &slirp->vhost_addr6, 64))) | |
74 | ||
05061d85 GS |
75 | #define in6_equal_dns(a)\ |
76 | ((in6_equal_net(a, &slirp->vprefix_addr6, slirp->vprefix_len)\ | |
77 | && in6_equal_mach(a, &slirp->vnameserver_addr6, slirp->vprefix_len))\ | |
78 | || (in6_equal_net(a, &(struct in6_addr)LINKLOCAL_ADDR, 64)\ | |
79 | && in6_equal_mach(a, &slirp->vnameserver_addr6, 64))) | |
0d6ff71a GS |
80 | |
81 | #define in6_equal_host(a)\ | |
82 | (in6_equal_router(a) || in6_equal_dns(a)) | |
83 | ||
84 | #define in6_solicitednode_multicast(a)\ | |
85 | (in6_equal_net(a, &(struct in6_addr)SOLICITED_NODE_PREFIX, 104)) | |
86 | ||
87 | /* Compute emulated host MAC address from its ipv6 address */ | |
88 | static inline void in6_compute_ethaddr(struct in6_addr ip, | |
89 | uint8_t eth[ETH_ALEN]) | |
90 | { | |
91 | eth[0] = 0x52; | |
92 | eth[1] = 0x56; | |
93 | memcpy(ð[2], &ip.s6_addr[16 - (ETH_ALEN - 2)], ETH_ALEN - 2); | |
94 | } | |
95 | ||
96 | /* | |
97 | * Definitions for internet protocol version 6. | |
98 | * Per RFC 2460, December 1998. | |
99 | */ | |
100 | #define IP6VERSION 6 | |
101 | #define IP6_HOP_LIMIT 255 | |
102 | ||
103 | /* | |
104 | * Structure of an internet header, naked of options. | |
105 | */ | |
106 | struct ip6 { | |
107 | #ifdef HOST_WORDS_BIGENDIAN | |
108 | uint32_t | |
109 | ip_v:4, /* version */ | |
110 | ip_tc_hi:4, /* traffic class */ | |
111 | ip_tc_lo:4, | |
112 | ip_fl_hi:4, /* flow label */ | |
113 | ip_fl_lo:16; | |
114 | #else | |
115 | uint32_t | |
116 | ip_tc_hi:4, | |
117 | ip_v:4, | |
118 | ip_fl_hi:4, | |
119 | ip_tc_lo:4, | |
120 | ip_fl_lo:16; | |
121 | #endif | |
122 | uint16_t ip_pl; /* payload length */ | |
123 | uint8_t ip_nh; /* next header */ | |
124 | uint8_t ip_hl; /* hop limit */ | |
125 | struct in6_addr ip_src, ip_dst; /* source and dest address */ | |
126 | } QEMU_PACKED; | |
127 | ||
128 | /* | |
129 | * IPv6 pseudo-header used by upper-layer protocols | |
130 | */ | |
131 | struct ip6_pseudohdr { | |
132 | struct in6_addr ih_src; /* source internet address */ | |
133 | struct in6_addr ih_dst; /* destination internet address */ | |
134 | uint32_t ih_pl; /* upper-layer packet length */ | |
135 | uint16_t ih_zero_hi; /* zero */ | |
136 | uint8_t ih_zero_lo; /* zero */ | |
137 | uint8_t ih_nh; /* next header */ | |
138 | } QEMU_PACKED; | |
139 | ||
140 | ||
141 | #endif |