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)\
  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)))
  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(&eth[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