slirp/ip6.h

   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
  75 #define in6_equal_dns(a) 0
  76
  77 #define in6_equal_host(a)\
  78     (in6_equal_router(a) || in6_equal_dns(a))
  79
  80 #define in6_solicitednode_multicast(a)\
  81     (in6_equal_net(a, &(struct in6_addr)SOLICITED_NODE_PREFIX, 104))
  82
  83 /* Compute emulated host MAC address from its ipv6 address */
  84 static inline void in6_compute_ethaddr(struct in6_addr ip,
  85                                        uint8_t eth[ETH_ALEN])
  86 {
  87     eth[0] = 0x52;
  88     eth[1] = 0x56;
  89     memcpy(&eth[2], &ip.s6_addr[16 - (ETH_ALEN - 2)], ETH_ALEN - 2);
  90 }
  91
  92 /*
  93  * Definitions for internet protocol version 6.
  94  * Per RFC 2460, December 1998.
  95  */
  96 #define IP6VERSION      6
  97 #define IP6_HOP_LIMIT 255
  98
  99 /*
 100  * Structure of an internet header, naked of options.
 101  */
 102 struct ip6 {
 103 #ifdef HOST_WORDS_BIGENDIAN
 104     uint32_t
 105         ip_v:4,         /* version */
 106         ip_tc_hi:4,     /* traffic class */
 107         ip_tc_lo:4,
 108         ip_fl_hi:4,     /* flow label */
 109         ip_fl_lo:16;
 110 #else
 111     uint32_t
 112         ip_tc_hi:4,
 113         ip_v:4,
 114         ip_fl_hi:4,
 115         ip_tc_lo:4,
 116         ip_fl_lo:16;
 117 #endif
 118     uint16_t    ip_pl;               /* payload length */
 119     uint8_t     ip_nh;               /* next header */
 120     uint8_t     ip_hl;               /* hop limit */
 121     struct in6_addr ip_src, ip_dst;  /* source and dest address */
 122 } QEMU_PACKED;
 123
 124 /*
 125  * IPv6 pseudo-header used by upper-layer protocols
 126  */
 127 struct ip6_pseudohdr {
 128     struct      in6_addr ih_src;  /* source internet address */
 129     struct      in6_addr ih_dst;  /* destination internet address */
 130     uint32_t    ih_pl;            /* upper-layer packet length */
 131     uint16_t    ih_zero_hi;       /* zero */
 132     uint8_t     ih_zero_lo;       /* zero */
 133     uint8_t     ih_nh;            /* next header */
 134 } QEMU_PACKED;
 135
 136
 137 #endif