Socket/Protocols/INet/INet6Address.hh

   1 // $Id$
   2 //
   3 // Copyright (C) 2007
   4 // Fraunhofer Institute for Open Communication Systems (FOKUS)
   5 // Competence Center NETwork research (NET), St. Augustin, GERMANY
   6 //     Stefan Bund <g0dil@berlios.de>
   7 //
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 2 of the License, or
  11 // (at your option) any later version.
  12 //
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the
  20 // Free Software Foundation, Inc.,
  21 // 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  22
  23 /** \file
  24     \brief INet6Address public header */
  25
  26 #ifndef HH_INet6Address_
  27 #define HH_INet6Address_ 1
  28
  29 // Custom includes
  30 #include <iostream>
  31 #include <string>
  32 #include <netinet/in.h>
  33 #include <boost/cstdint.hpp>
  34 #include <boost/array.hpp>
  35 #include <boost/operators.hpp>
  36 #include "../../../Utils/safe_bool.hh"
  37 #include "../../../Utils/Tags.hh"
  38 #include "INet4Address.hh"
  39 #include "../AddressExceptions.hh"
  40
  41 //#include "INet6Address.mpp"
  42 #include "INet6Address.ih"
  43 ///////////////////////////////hh.p////////////////////////////////////////
  44
  45 namespace senf {
  46
  47     /** \brief INet6 network address
  48
  49         This implementation of an INet6 address is based strictly on
  50         <a href="http://tools.ietf.org/html/rfc4291">RFC 4291</a>: Internet Protocol
  51         Version 6 (INet6) Addressing Architecture. This class provides accessors to all the
  52         information fields defined in this document.
  53
  54         The INet6 addressing architecture however has several other components defined in other
  55         RFC's. These RFC's should be implemented in additional modules:
  56
  57         \li <a href="http://tools.ietf.org/html/rfc4193">RFC 4193</a>:
  58             Unique Local Addresses (ULA). Defines the fc00::/7 prefix
  59         \li <a href="http://tools.ietf.org/html/rfc3306">RFC 3306</a>:
  60             Unicast-Prefix-based INet6 Multicast Addresses. Defines the ff30::/12 prefix
  61         \li <a href="http://tools.ietf.org/html/rfc3956">RFC 3956</a>:
  62             Embedding the Rendezvous Point (RP) Address in an INet6 Multicast
  63             Address. Defines the ff70::/12 prefix
  64         \li <a href="http://tools.ietf.org/html/rfc3056">RFC 3056</a>:
  65             Connection of INet6 Domains via INet4 Clouds. Defines 6to4 tunneling and the
  66             2002::/16 prefix
  67         \li <a href="http://tools.ietf.org/html/rfc3849">RFC 3849</a>:
  68             INet6 Address Prefix Reserved for Documentation. Defines the 2001:db8::/32 prefix
  69
  70         Here an overview of well-known prefixes:
  71
  72         \htmlonly
  73         <table class="senf">
  74         <tr><th>Prefix</th>                  <th>Description</th>                         <th>Definition</th>  <th>Note</th></tr>
  75         <tr><td><tt>::/96</tt></td>          <td>INet4 compatible INet6 address</td>      <td>RFC4291</td>     <td>deprecated</td></tr>
  76         <tr><td><tt>::ffff:0:0/96</tt></td>  <td>INet6 mapped INet4 address</td>          <td>RFC4291</td>     <td></td></tr>
  77         <tr><td><tt>2000::/3</tt></td>       <td>Global unicast addresses</td>            <td>RFC3587</td>     <td>only noted, not defined</td></tr>
  78         <tr><td><tt>2001:db8::/32</tt></td>  <td>Documentation-only prefix</td>           <td>RFC3849</td>     <td></td></tr>
  79         <tr><td><tt>2002::/16</tt></td>      <td>6to4 addressing</td>                     <td>RFC3056</td>     <td></td></tr>
  80         <tr><td><tt>fc00::/7</tt></td>       <td>ULA</td>                                 <td>RFC4193</td>     <td></td></tr>
  81         <tr><td><tt>fe80::/64</tt></td>      <td>Link-local addresses</td>                <td>RFC4291</td>     <td></td></tr>
  82         <tr><td><tt>fec0::/10</tt></td>      <td>Site-local addresses </td>               <td>RFC4291</td>     <td>deprecated</td></tr>
  83         <tr><td><tt>ff00::/8</tt></td>       <td>Multicast</td>                           <td>RFC4291</td>     <td></td></tr>
  84         <tr><td><tt>ff00::/12</tt></td>      <td>Globally allocated multicast</td>        <td>RFC4291</td>     <td></td></tr>
  85         <tr><td><tt>ff10::/12</tt></td>      <td>Locally allocated multicast</td>         <td>RFC4291</td>     <td></td></tr>
  86         <tr><td><tt>ff30::/12</tt></td>      <td>Unicast prefic based multicast</td>      <td>RFC3306</td>     <td></td></tr>
  87         <tr><td><tt>ff70::/12</tt></td>      <td>Multicast address with embedded RP</td>  <td>RFC3956</td>     <td></td></tr>
  88         </table>
  89         \endhtmlonly
  90
  91         The following statements all create the same INet6 address
  92         <code>2001:db8::a0b1:1a2b:3dff:fe4e:5f00</code>:
  93         \code
  94         // Used to construct constant INet6 addresses
  95         INet6Address(0x2001u,0xDB8u,0x0u,0xA0B1u 0x1A2Bu,0x3DFFu,0xFE4Eu,0x5F00u)
  96
  97         // Construct INet6 address from it's string representation
  98         INet6Address::from_string("2001:db8::a0b1:1a2b:3dff:fe4e:5f00")
  99
 100         // Construct an INet6 address from raw data. 'from_data' takes an arbitrary iterator (e.g. a
 101         // pointer) as argument. Here we use a fixed array but normally you will need this to build
 102         // an INet6 address in a packet parser
 103         char rawBytes[] = { 0x20, 0x01, 0x0D, 0xB8, 0x00, 0x00, 0xA0, 0xB1,
 104                             0x1a, 0x2b, 0x3d, 0xff, 0xfe, 0x4e, 0xff, 0x00 };
 105         INet6Address::from_data(rawBytes)
 106         \endcode
 107
 108         Since INet6Address class is based on \c boost::array and is built as a fixed-size sequence
 109         of 16 bytes, you can access the raw data bytes of the address (in network byte order) using
 110         \c begin(), \c end() or \c operator[]
 111         \code
 112         INet6Address ina = ...;
 113         Packet::iterator i = ...;
 114         std::copy(ina.begin(), ina.end(), i); // Copies 16 bytes
 115         \endcode
 116
 117         \see CheckINet6Network \n INet6Network
 118         \ingroup addr_group
 119
 120         \implementation We awkwardly need to use static named constructors (<tt>from_</tt> members)
 121             instead of ordinarily overloaded constructors for one simple reason: <tt>char *</tt>
 122             doubles as string literal and as arbitrary data iterator. The iterator constructor can
 123             therefore not be distinguished from initialization with a string literal. Therefore we
 124             need to disambiguate using the named constructors.
 125      */
 126     class INet6Address
 127         : public boost::array<boost::uint8_t,16>,
 128           public comparable_safe_bool<INet6Address>
 129     {
 130     public:
 131         ///////////////////////////////////////////////////////////////////////////
 132         // Types
 133
 134         static INet6Address const None;        ///< The empty (::0) address
 135         static INet6Address const Loopback;    ///< The loopback (::1) address
 136         static INet6Address const AllNodes;    ///< The 'all nodes' link-local multicast address
 137         static INet6Address const AllRouters;  ///< The 'all routers' link-local multicast address
 138
 139         enum Resolve_t { ResolveINet6, ResolveINet4 };
 140
 141         /** \brief Possible scope values
 142
 143             List of all possible scope values. This list includes all scope values defined for
 144             multicast addresses in <a href="http://tools.ietf.org/html/rfc4291">RFC 4291</a>.
 145             The values \ref LinkScope, \ref SiteScope and \ref GlobalScope are also used with
 146             unicast addresses.
 147          */
 148         enum ScopeId {
 149               InterfaceScope    =  1    /**< Interface only scope */
 150             , LinkScope         =  2    /**< Link-local scope */
 151             , AdminScope        =  4    /**< Administration defined local scope */
 152             , SiteScope         =  5    /**< Site-local scope */
 153             , OrganizationScope =  8    /**< Scope covering multiple sites of an organization */
 154             , GlobalScope       = 14    /**< Global Internet scope */
 155
 156             , ReservedScope     =  0    /**< Reserved scope value */
 157             , UnassignedScope   =  6    /**< Unassigned scope, may be defined locally */
 158         };
 159
 160         ///////////////////////////////////////////////////////////////////////////
 161         ///\name Structors and default members
 162         ///@{
 163
 164         explicit INet6Address(senf::NoInit_t); ///< Construct uninitialized (!) address
 165         explicit INet6Address(boost::uint16_t a0=0u, boost::uint16_t a1=0u, boost::uint16_t a2=0u,
 166                               boost::uint16_t a3=0u, boost::uint16_t a4=0u, boost::uint16_t a5=0u,
 167                               boost::uint16_t a6=0u, boost::uint16_t a7=0u);
 168                                         ///< Construct an address constant
 169
 170         static INet6Address from_in6addr(in6_addr const & in6addr); ///< Construct from std C struct
 171
 172         static INet6Address from_string(std::string const & s, Resolve_t resolve = ResolveINet6);
 173                                         ///< Convert string to address
 174                                         /**< This member will try to convert the given string into
 175                                              an IP address. from_string() supports all standard IP
 176                                              literal representations as well es hostnames.
 177                                              \attention This call may block if \a s represents a
 178                                                  hostname which must be looked up via some network
 179                                                  protocol like DNS or NIS
 180                                              \throws AddressSyntaxException if the address cannot be
 181                                                  converted for some reason
 182                                              \param[in] s Address literal or hostname
 183                                              \param[in] resolve If this is set to \c ResolveINet4,
 184                                                  the call will additionally try to interpret \a s as
 185                                                  an INet4 address if no valid INet6 address is
 186                                                  found. The address will be returned as mapped INet6
 187                                                  address. */
 188
 189         template <class InputIterator>
 190         static INet6Address from_data(InputIterator i);
 191                                         ///< Construct address from 16 bytes of raw data
 192                                         /**< from_data will build an address from 16 bytes of raw
 193                                              data as accessed by the iterator. The data must be in
 194                                              network byte order. */
 195
 196         static INet6Address from_inet4address(INet4Address addr);
 197                                         ///< Construct an INet6-mapped INet4 address
 198                                         /**< This will construct an address of the form
 199                                              <tt>::FFFF::w.x.y.z</tt> where <tt>w.x.y.z</tt> is
 200                                              the INet4Address value. This kind of address is called
 201                                              an INet6-mapped INet4 address (see
 202                                              <a href="http://tools.ietf.org/html/rfc4291">RFC 4291</a>).
 203                                              \par
 204                                              INet4 compatible INet6 addresses are not directly
 205                                              supported, they are deprecated in the RFC. */
 206         std::string toString() const;
 207                                         ///< get the string representation of this INet6Address
 208         in6_addr  toin6_addr() const;
 209                                         ///< get the linux in6_addr struct (convinience only)
 210
 211
 212         ///@}
 213         ///////////////////////////////////////////////////////////////////////////
 214         ///\name Accessors
 215         ///@{
 216
 217         boost::uint64_t network() const; ///< Return 64bit network part
 218         bool hasEuid64() const;         ///< \c true, if address is based on an EUID-64
 219         boost::uint64_t id() const;     ///< Return interface id (EUID-64)
 220         bool universalId() const;       ///< \c true, if the id() is universally assigned
 221         bool groupId() const;           ///< \c true, if the id()'s \a group bit is set
 222
 223         bool unicast() const;           ///< \c true, if address is unicast
 224         bool multicast() const;         ///< \c true, if address is multicast
 225                                         /**< To support a linux specific extension, INet4 multicast
 226                                              addressed mapped to INet6 are also interpreted as
 227                                              multicast addresses. This is NOT part of the standard,
 228                                              however the standard officially only allows unicast v4
 229                                              addresses to be mapped to v6 so this does not collide
 230                                              with any standard conforming use. */
 231
 232         ScopeId scope() const;          ///< Get address's scope
 233                                         /**< The scope of an address is one of the \ref ScopeId
 234                                              values. We need to differentiate between unicast and
 235                                              multicast addresses: unicast addresses only have local,
 236                                              site or global scope (where site scope is deprecated),
 237                                              multicast address can have a number of scope values of
 238                                              which local, site and global are a few. See the \ref
 239                                              ScopeId enumerators. */
 240         bool globalScope() const;       ///< \c true, if address is global unicast or multicast
 241         bool linkScope() const;         ///< \c true, if address is link-local unicast or multicast
 242
 243         INet4Address inet4address() const; ///< Return embedded INet4 address
 244                                         /**< Returns the INet4 address embedded within an INet4
 245                                              compatible or INet4 mapped unicast address. This address
 246                                              is given by the last 32 bits of the INet6 address. \par
 247                                              The value returned is only a valid INet4 address if
 248                                              either inet4Compatible() or inet4Mapped() return \c
 249                                              true. */
 250         bool inet4Compatible() const;   ///< \c true, if address is INet4 compatible
 251                                         /**< INet4 compatible INet6 addresses are deprecated. */
 252         bool inet4Mapped() const;       ///< \c true, if address is INet4 mapped
 253
 254         bool globalMulticastAddr() const; ///< \c true, if T bit is \e not set
 255                                         /**< Any multicast address with a cleared T bit must be
 256                                              globally assigned. See
 257                                              <a href="http://tools.ietf.org/html/rfc4291">RFC 4291</a>. */
 258         bool prefixMulticastAddr() const; ///< \c true, if P bit is set
 259                                         /**< In <a href="http://tools.ietf.org/html/rfc4291">RFC 4291</a>,
 260                                              the P bit is specified as defining a
 261                                              unicast prefix based multicast address. See
 262                                              <a href="http://tools.ietf.org/html/rfc3306">RFC 3306</a>. */
 263         bool embeddedRpAddr() const;    ///< \c true, if R bit is set
 264                                         /**< In <a href="http://tools.ietf.org/html/rfc4291">RFC 4291</a>,
 265                                              the R bit is specified as defining a multicast address
 266                                              with embedded rendezvous point. See
 267                                              <a href="http://tools.ietf.org/html/rfc3956">RFC 3956</a>. */
 268
 269         bool boolean_test() const;      ///< \c true, if address != '::' (None)
 270
 271         ///@}
 272         ///\name Mutators
 273         ///@{
 274
 275         void network(boost::uint64_t net); ///< Set network part of address
 276         void id(boost::uint64_t id);    ///< Set interface id part of address
 277
 278         ///@}
 279
 280     };
 281
 282     /** \brief Output INet6Address instance as it's string representation
 283         \related INet6Address
 284      */
 285     std::ostream & operator<<(std::ostream & os, INet6Address const & addr);
 286
 287     /** \brief Check INet6Address against a fixed network prefix
 288
 289         This helper allows to easily and efficiently check an INet6Address against an arbitrary but
 290         constant network prefix. It takes from 1 to 8 arguments for the network address and an
 291         additional last argument providing the prefix length. So
 292
 293         \par ""
 294             <tt>senf::CheckINet6Network<</tt> <i>addr_1</i> <tt>,</tt> <i>addr_2</i> <tt>,</tt>
 295             ... <tt>,</tt> <i>prefix_len</i> <tt>></tt>
 296
 297         represents the network
 298
 299         \par ""
 300             <i>addr_1</i> <tt>:</tt> <i>addr_2</i> <tt>:</tt> ... <tt>::/</tt> <i>prefix_len</i> .
 301
 302         The class exposes a single static member <tt>match(</tt> <i>addr</i> <tt>)</tt> which
 303         matches the INet6Address \a addr against the prefix:
 304
 305         \code
 306         if (senf::CheckINet6Network<0x2000u,0xDB8u,32u>::match(addr)) {
 307             // 'addr' is within in the 2001:db8::/32 documentation-only network
 308             ...
 309         }
 310         \endcode
 311
 312         The code generated by this call is highly optimized and probably as efficient as it can get.
 313      */
 314     template <unsigned a0, unsigned a1, unsigned a2=0u, unsigned a3=0u, unsigned a4=0u,
 315               unsigned a5=0u, unsigned a6=0u, unsigned a7=0u, unsigned a8=0u>
 316     struct CheckINet6Network
 317         : public detail::CheckINet6Network_impl<a0,a1,a2,a3,a4,a5,a6,a7,a8>
 318     {};
 319
 320     /** \brief INet6 network prefix
 321
 322         This class represents an INet6 network prefix in CIDR notation.
 323       */
 324     class INet6Network
 325         : public boost::equality_comparable<INet6Network>,
 326           public comparable_safe_bool<INet6Network>
 327     {
 328     public:
 329         ///////////////////////////////////////////////////////////////////////////
 330         ///\name Structors and default members
 331         ///@{
 332
 333         INet6Network();                 ///< Construct empty (::/0) network
 334         INet6Network(INet6Address address, unsigned prefix_len);
 335                                         ///< Construct network from given address and prefix length
 336         explicit INet6Network(std::string s); ///< Construct network from CIDR notation
 337
 338         ///@}
 339         ///////////////////////////////////////////////////////////////////////////
 340
 341         INet6Address const & address() const; ///< Get the network address
 342         unsigned prefix_len() const;    ///< Get the network prefix length
 343
 344         bool boolean_test() const;      ///< \c true, if INet6Network is non-empty
 345         bool operator==(INet6Network const & other) const;
 346                                         ///< Compare two networks for equality
 347
 348         bool match(INet6Address addr) const; ///< \c true, if the network includes \a addr
 349         bool match(INet6Network net) const; ///< \c true, if the network includes \a net
 350                                         /**< The is true, if \a net is sub-network (or the same as)
 351                                              \c this. */
 352         INet6Address host(boost::uint64_t id); ///< Return the host with the given id
 353                                         /**< Returns the host with the given number within the
 354                                              network. This call replaces the lower 64 bits of the
 355                                              network address with the given id. */
 356
 357         INet6Network subnet(boost::uint64_t net, unsigned prefix_len);
 358                                         ///< Return the given subnet of \c this
 359                                         /**< The returned INet6Network will be a subnet of \c this
 360                                              with the given network number. The network number is
 361                                              comprised by the bits above \a prefix_len:
 362                                              \code
 363                                              INet6Network("2001:db8::/32").subnet(0x12u,40u) == INet6Network("2001:db8:1200::/40")
 364                                              INet6Network("2001:db8:1200::/40").subnet(0x2345,64u) == INet6Network("2001:db8:1200:2345::/64")
 365                                              \endcode
 366                                              \param[in] net network number
 367                                              \param[in] prefix_len length of subnet prefix */
 368
 369     protected:
 370
 371     private:
 372         unsigned prefix_len_;
 373         INet6Address address_;
 374     };
 375
 376     /** \brief Output INet6Network instance as it's string representation
 377         \related INet6Network
 378      */
 379     std::ostream & operator<<(std::ostream & os, INet6Network const & addr);
 380 }
 381
 382 ///////////////////////////////hh.e////////////////////////////////////////
 383 #include "INet6Address.cci"
 384 #include "INet6Address.ct"
 385 #include "INet6Address.cti"
 386 #endif
 387
 388 \f
 389 // Local Variables:
 390 // mode: c++
 391 // fill-column: 100
 392 // comment-column: 40
 393 // c-file-style: "senf"
 394 // indent-tabs-mode: nil
 395 // ispell-local-dictionary: "american"
 396 // compile-command: "scons -u test"
 397 // End: