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 #define ZERO_ADDR  { .s6_addr = \
  30                         { 0x00, 0x00, 0x00, 0x00,\
  31                         0x00, 0x00, 0x00, 0x00,\
  32                         0x00, 0x00, 0x00, 0x00,\
  33                         0x00, 0x00, 0x00, 0x00 } }
  34
  35 static inline bool in6_equal(const struct in6_addr *a, const struct in6_addr *b)
  36 {
  37     return memcmp(a, b, sizeof(*a)) == 0;
  38 }
  39
  40 static inline bool in6_equal_net(const struct in6_addr *a,
  41                                  const struct in6_addr *b,
  42                                  int prefix_len)
  43 {
  44     if (memcmp(a, b, prefix_len / 8) != 0) {
  45         return 0;
  46     }
  47
  48     if (prefix_len % 8 == 0) {
  49         return 1;
  50     }
  51
  52     return a->s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8))
  53         == b->s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8));
  54 }
  55
  56 static inline bool in6_equal_mach(const struct in6_addr *a,
  57                                   const struct in6_addr *b,
  58                                   int prefix_len)
  59 {
  60     if (memcmp(&(a->s6_addr[(prefix_len + 7) / 8]),
  61                &(b->s6_addr[(prefix_len + 7) / 8]),
  62                16 - (prefix_len + 7) / 8) != 0) {
  63         return 0;
  64     }
  65
  66     if (prefix_len % 8 == 0) {
  67         return 1;
  68     }
  69
  70     return (a->s6_addr[prefix_len / 8] & ((1U << (8 - (prefix_len % 8))) - 1))
  71         == (b->s6_addr[prefix_len / 8] & ((1U << (8 - (prefix_len % 8))) - 1));
  72 }
  73
  74
  75 #define in6_equal_router(a)\
  76     ((in6_equal_net(a, &slirp->vprefix_addr6, slirp->vprefix_len)\
  77       && in6_equal_mach(a, &slirp->vhost_addr6, slirp->vprefix_len))\
  78   || (in6_equal_net(a, &(struct in6_addr)LINKLOCAL_ADDR, 64)\
  79       && in6_equal_mach(a, &slirp->vhost_addr6, 64)))
  80
  81 #define in6_equal_dns(a)\
  82     ((in6_equal_net(a, &slirp->vprefix_addr6, slirp->vprefix_len)\
  83       && in6_equal_mach(a, &slirp->vnameserver_addr6, slirp->vprefix_len))\
  84   || (in6_equal_net(a, &(struct in6_addr)LINKLOCAL_ADDR, 64)\
  85       && in6_equal_mach(a, &slirp->vnameserver_addr6, 64)))
  86
  87 #define in6_equal_host(a)\
  88     (in6_equal_router(a) || in6_equal_dns(a))
  89
  90 #define in6_solicitednode_multicast(a)\
  91     (in6_equal_net(a, &(struct in6_addr)SOLICITED_NODE_PREFIX, 104))
  92
  93 #define in6_zero(a)\
  94     (in6_equal(a, &(struct in6_addr)ZERO_ADDR))
  95
  96 /* Compute emulated host MAC address from its ipv6 address */
  97 static inline void in6_compute_ethaddr(struct in6_addr ip,
  98                                        uint8_t eth[ETH_ALEN])
  99 {
 100     eth[0] = 0x52;
 101     eth[1] = 0x56;
 102     memcpy(&eth[2], &ip.s6_addr[16 - (ETH_ALEN - 2)], ETH_ALEN - 2);
 103 }
 104
 105 /*
 106  * Definitions for internet protocol version 6.
 107  * Per RFC 2460, December 1998.
 108  */
 109 #define IP6VERSION      6
 110 #define IP6_HOP_LIMIT 255
 111
 112 /*
 113  * Structure of an internet header, naked of options.
 114  */
 115 struct ip6 {
 116 #ifdef HOST_WORDS_BIGENDIAN
 117     uint32_t
 118         ip_v:4,         /* version */
 119         ip_tc_hi:4,     /* traffic class */
 120         ip_tc_lo:4,
 121         ip_fl_hi:4,     /* flow label */
 122         ip_fl_lo:16;
 123 #else
 124     uint32_t
 125         ip_tc_hi:4,
 126         ip_v:4,
 127         ip_fl_hi:4,
 128         ip_tc_lo:4,
 129         ip_fl_lo:16;
 130 #endif
 131     uint16_t    ip_pl;               /* payload length */
 132     uint8_t     ip_nh;               /* next header */
 133     uint8_t     ip_hl;               /* hop limit */
 134     struct in6_addr ip_src, ip_dst;  /* source and dest address */
 135 } QEMU_PACKED;
 136
 137 /*
 138  * IPv6 pseudo-header used by upper-layer protocols
 139  */
 140 struct ip6_pseudohdr {
 141     struct      in6_addr ih_src;  /* source internet address */
 142     struct      in6_addr ih_dst;  /* destination internet address */
 143     uint32_t    ih_pl;            /* upper-layer packet length */
 144     uint16_t    ih_zero_hi;       /* zero */
 145     uint8_t     ih_zero_lo;       /* zero */
 146     uint8_t     ih_nh;            /* next header */
 147 } QEMU_PACKED;
 148
 149
 150 #endif