slirp/ip6_icmp.h

   1 /*
   2  * Copyright (c) 2013
   3  * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
   4  */
   5
   6 #ifndef SLIRP_IP6_ICMP_H
   7 #define SLIRP_IP6_ICMP_H
   8
   9 /*
  10  * Interface Control Message Protocol version 6 Definitions.
  11  * Per RFC 4443, March 2006.
  12  *
  13  * Network Discover Protocol Definitions.
  14  * Per RFC 4861, September 2007.
  15  */
  16
  17 struct icmp6_echo { /* Echo Messages */
  18     uint16_t id;
  19     uint16_t seq_num;
  20 };
  21
  22 union icmp6_error_body {
  23     uint32_t unused;
  24     uint32_t pointer;
  25     uint32_t mtu;
  26 };
  27
  28 /*
  29  * NDP Messages
  30  */
  31 struct ndp_rs {     /* Router Solicitation Message */
  32     uint32_t reserved;
  33 };
  34
  35 struct ndp_ra {     /* Router Advertisement Message */
  36     uint8_t chl;    /* Cur Hop Limit */
  37 #if G_BYTE_ORDER == G_BIG_ENDIAN
  38     uint8_t
  39         M:1,
  40         O:1,
  41         reserved:6;
  42 #else
  43     uint8_t
  44         reserved:6,
  45         O:1,
  46         M:1;
  47 #endif
  48     uint16_t lifetime;      /* Router Lifetime */
  49     uint32_t reach_time;    /* Reachable Time */
  50     uint32_t retrans_time;  /* Retrans Timer */
  51 };
  52
  53 G_STATIC_ASSERT(sizeof(struct ndp_ra) == 12);
  54
  55 struct ndp_ns {     /* Neighbor Solicitation Message */
  56     uint32_t reserved;
  57     struct in6_addr target; /* Target Address */
  58 };
  59
  60 G_STATIC_ASSERT(sizeof(struct ndp_ns) == 20);
  61
  62 struct ndp_na {     /* Neighbor Advertisement Message */
  63 #if G_BYTE_ORDER == G_BIG_ENDIAN
  64     uint32_t
  65         R:1,                /* Router Flag */
  66         S:1,                /* Solicited Flag */
  67         O:1,                /* Override Flag */
  68         reserved_hi:5,
  69         reserved_lo:24;
  70 #else
  71     uint32_t
  72         reserved_hi:5,
  73         O:1,
  74         S:1,
  75         R:1,
  76         reserved_lo:24;
  77 #endif
  78     struct in6_addr target; /* Target Address */
  79 };
  80
  81 G_STATIC_ASSERT(sizeof(struct ndp_na) == 20);
  82
  83 struct ndp_redirect {
  84     uint32_t reserved;
  85     struct in6_addr target; /* Target Address */
  86     struct in6_addr dest;   /* Destination Address */
  87 };
  88
  89 G_STATIC_ASSERT(sizeof(struct ndp_redirect) == 36);
  90
  91 /*
  92  * Structure of an icmpv6 header.
  93  */
  94 struct icmp6 {
  95     uint8_t     icmp6_type;         /* type of message, see below */
  96     uint8_t     icmp6_code;         /* type sub code */
  97     uint16_t    icmp6_cksum;        /* ones complement cksum of struct */
  98     union {
  99         union icmp6_error_body error_body;
 100         struct icmp6_echo echo;
 101         struct ndp_rs ndp_rs;
 102         struct ndp_ra ndp_ra;
 103         struct ndp_ns ndp_ns;
 104         struct ndp_na ndp_na;
 105         struct ndp_redirect ndp_redirect;
 106     } icmp6_body;
 107 #define icmp6_err icmp6_body.error_body
 108 #define icmp6_echo icmp6_body.echo
 109 #define icmp6_nrs icmp6_body.ndp_rs
 110 #define icmp6_nra icmp6_body.ndp_ra
 111 #define icmp6_nns icmp6_body.ndp_ns
 112 #define icmp6_nna icmp6_body.ndp_na
 113 #define icmp6_redirect icmp6_body.ndp_redirect
 114 };
 115
 116 G_STATIC_ASSERT(sizeof(struct icmp6) == 40);
 117
 118 #define ICMP6_MINLEN    4
 119 #define ICMP6_ERROR_MINLEN  8
 120 #define ICMP6_ECHO_MINLEN   8
 121 #define ICMP6_NDP_RS_MINLEN 8
 122 #define ICMP6_NDP_RA_MINLEN 16
 123 #define ICMP6_NDP_NS_MINLEN 24
 124 #define ICMP6_NDP_NA_MINLEN 24
 125 #define ICMP6_NDP_REDIRECT_MINLEN 40
 126
 127 /*
 128  * NDP Options
 129  */
 130 struct ndpopt {
 131     uint8_t     ndpopt_type;                    /* Option type */
 132     uint8_t     ndpopt_len;                     /* /!\ In units of 8 octets */
 133     union {
 134         unsigned char   linklayer_addr[6];      /* Source/Target Link-layer */
 135 #define ndpopt_linklayer ndpopt_body.linklayer_addr
 136         struct prefixinfo {                     /* Prefix Information */
 137             uint8_t     prefix_length;
 138 #if G_BYTE_ORDER == G_BIG_ENDIAN
 139             uint8_t     L:1, A:1, reserved1:6;
 140 #else
 141             uint8_t     reserved1:6, A:1, L:1;
 142 #endif
 143             uint32_t    valid_lt;               /* Valid Lifetime */
 144             uint32_t    pref_lt;                /* Preferred Lifetime */
 145             uint32_t    reserved2;
 146             struct in6_addr prefix;
 147         } SLIRP_PACKED prefixinfo;
 148 #define ndpopt_prefixinfo ndpopt_body.prefixinfo
 149         struct rdnss {
 150             uint16_t reserved;
 151             uint32_t lifetime;
 152             struct in6_addr addr;
 153         } SLIRP_PACKED rdnss;
 154 #define ndpopt_rdnss ndpopt_body.rdnss
 155     } ndpopt_body;
 156 } SLIRP_PACKED;
 157
 158 /* NDP options type */
 159 #define NDPOPT_LINKLAYER_SOURCE     1   /* Source Link-Layer Address */
 160 #define NDPOPT_LINKLAYER_TARGET     2   /* Target Link-Layer Address */
 161 #define NDPOPT_PREFIX_INFO          3   /* Prefix Information */
 162 #define NDPOPT_RDNSS                25  /* Recursive DNS Server Address */
 163
 164 /* NDP options size, in octets. */
 165 #define NDPOPT_LINKLAYER_LEN    8
 166 #define NDPOPT_PREFIXINFO_LEN   32
 167 #define NDPOPT_RDNSS_LEN        24
 168
 169 /*
 170  * Definition of type and code field values.
 171  * Per https://www.iana.org/assignments/icmpv6-parameters/icmpv6-parameters.xml
 172  * Last Updated 2012-11-12
 173  */
 174
 175 /* Errors */
 176 #define ICMP6_UNREACH   1   /* Destination Unreachable */
 177 #define     ICMP6_UNREACH_NO_ROUTE      0   /* no route to dest */
 178 #define     ICMP6_UNREACH_DEST_PROHIB   1   /* com with dest prohibited */
 179 #define     ICMP6_UNREACH_SCOPE         2   /* beyond scope of src addr */
 180 #define     ICMP6_UNREACH_ADDRESS       3   /* address unreachable */
 181 #define     ICMP6_UNREACH_PORT          4   /* port unreachable */
 182 #define     ICMP6_UNREACH_SRC_FAIL      5   /* src addr failed */
 183 #define     ICMP6_UNREACH_REJECT_ROUTE  6   /* reject route to dest */
 184 #define     ICMP6_UNREACH_SRC_HDR_ERROR 7   /* error in src routing header */
 185 #define ICMP6_TOOBIG    2   /* Packet Too Big */
 186 #define ICMP6_TIMXCEED  3   /* Time Exceeded */
 187 #define     ICMP6_TIMXCEED_INTRANS      0   /* hop limit exceeded in transit */
 188 #define     ICMP6_TIMXCEED_REASS        1   /* ttl=0 in reass */
 189 #define ICMP6_PARAMPROB 4   /* Parameter Problem */
 190 #define     ICMP6_PARAMPROB_HDR_FIELD   0   /* err header field */
 191 #define     ICMP6_PARAMPROB_NXTHDR_TYPE 1   /* unrecognized Next Header type */
 192 #define     ICMP6_PARAMPROB_IPV6_OPT    2   /* unrecognized IPv6 option */
 193
 194 /* Informational Messages */
 195 #define ICMP6_ECHO_REQUEST      128 /* Echo Request */
 196 #define ICMP6_ECHO_REPLY        129 /* Echo Reply */
 197 #define ICMP6_NDP_RS            133 /* Router Solicitation (NDP) */
 198 #define ICMP6_NDP_RA            134 /* Router Advertisement (NDP) */
 199 #define ICMP6_NDP_NS            135 /* Neighbor Solicitation (NDP) */
 200 #define ICMP6_NDP_NA            136 /* Neighbor Advertisement (NDP) */
 201 #define ICMP6_NDP_REDIRECT      137 /* Redirect Message (NDP) */
 202
 203 /*
 204  * Router Configuration Variables (rfc4861#section-6)
 205  */
 206 #define NDP_IsRouter                1
 207 #define NDP_AdvSendAdvertisements   1
 208 #define NDP_MaxRtrAdvInterval       600000
 209 #define NDP_MinRtrAdvInterval       ((NDP_MaxRtrAdvInterval >= 9) ? \
 210                                         NDP_MaxRtrAdvInterval / 3 : \
 211                                         NDP_MaxRtrAdvInterval)
 212 #define NDP_AdvManagedFlag          0
 213 #define NDP_AdvOtherConfigFlag      0
 214 #define NDP_AdvLinkMTU              0
 215 #define NDP_AdvReachableTime        0
 216 #define NDP_AdvRetransTime          0
 217 #define NDP_AdvCurHopLimit          64
 218 #define NDP_AdvDefaultLifetime      ((3 * NDP_MaxRtrAdvInterval) / 1000)
 219 #define NDP_AdvValidLifetime        86400
 220 #define NDP_AdvOnLinkFlag           1
 221 #define NDP_AdvPrefLifetime         14400
 222 #define NDP_AdvAutonomousFlag       1
 223
 224 void icmp6_init(Slirp *slirp);
 225 void icmp6_cleanup(Slirp *slirp);
 226 void icmp6_input(struct mbuf *);
 227 void icmp6_send_error(struct mbuf *m, uint8_t type, uint8_t code);
 228 void ndp_send_ra(Slirp *slirp);
 229 void ndp_send_ns(Slirp *slirp, struct in6_addr addr);
 230
 231 #endif