src/base/inet.hh

   1 /*
   2  * Copyright (c) 2013 ARM Limited
   3  * All rights reserved
   4  *
   5  * The license below extends only to copyright in the software and shall
   6  * not be construed as granting a license to any other intellectual
   7  * property including but not limited to intellectual property relating
   8  * to a hardware implementation of the functionality of the software
   9  * licensed hereunder.  You may use the software subject to the license
  10  * terms below provided that you ensure that this notice is replicated
  11  * unmodified and in its entirety in all distributions of the software,
  12  * modified or unmodified, in source code or in binary form.
  13  *
  14  * Copyright (c) 2002-2005 The Regents of The University of Michigan
  15  * Copyright (c) 2010 Advanced Micro Devices, Inc.
  16  * All rights reserved.
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions are
  20  * met: redistributions of source code must retain the above copyright
  21  * notice, this list of conditions and the following disclaimer;
  22  * redistributions in binary form must reproduce the above copyright
  23  * notice, this list of conditions and the following disclaimer in the
  24  * documentation and/or other materials provided with the distribution;
  25  * neither the name of the copyright holders nor the names of its
  26  * contributors may be used to endorse or promote products derived from
  27  * this software without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  30  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  31  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  32  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  33  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  34  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  35  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  36  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  37  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  38  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  39  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  40  */
  41
  42 #ifndef __BASE_INET_HH__
  43 #define __BASE_INET_HH__
  44
  45 #include <iosfwd>
  46 #include <string>
  47 #include <utility>
  48 #include <vector>
  49
  50 #include "base/types.hh"
  51 #include "dev/net/etherpkt.hh"
  52 #include "dnet/os.h"
  53 #include "dnet/eth.h"
  54 #include "dnet/ip.h"
  55 #include "dnet/ip6.h"
  56 #include "dnet/addr.h"
  57 #include "dnet/arp.h"
  58 #include "dnet/icmp.h"
  59 #include "dnet/tcp.h"
  60 #include "dnet/udp.h"
  61 #include "dnet/intf.h"
  62 #include "dnet/route.h"
  63 #include "dnet/fw.h"
  64 #include "dnet/blob.h"
  65 #include "dnet/rand.h"
  66
  67 namespace Net {
  68
  69 /*
  70  * Ethernet Stuff
  71  */
  72 struct EthAddr : protected eth_addr
  73 {
  74   protected:
  75     void parse(const std::string &addr);
  76
  77   public:
  78     EthAddr();
  79     EthAddr(const uint8_t ea[ETH_ADDR_LEN]);
  80     EthAddr(const eth_addr &ea);
  81     EthAddr(const std::string &addr);
  82     const EthAddr &operator=(const eth_addr &ea);
  83     const EthAddr &operator=(const std::string &addr);
  84
  85     int size() const { return sizeof(eth_addr); }
  86
  87     const uint8_t *bytes() const { return &data[0]; }
  88     uint8_t *bytes() { return &data[0]; }
  89
  90     const uint8_t *addr() const { return &data[0]; }
  91     bool unicast() const { return !(data[0] & 0x01); }
  92     bool multicast() const { return !unicast() && !broadcast(); }
  93     bool broadcast() const
  94     {
  95         bool isBroadcast = true;
  96         for (int i = 0; i < ETH_ADDR_LEN; ++i) {
  97             isBroadcast = isBroadcast && data[i] == 0xff;
  98         }
  99
 100         return isBroadcast;
 101     }
 102
 103     std::string string() const;
 104
 105     operator uint64_t() const
 106     {
 107         uint64_t reg = 0;
 108         reg |= ((uint64_t)data[0]) << 40;
 109         reg |= ((uint64_t)data[1]) << 32;
 110         reg |= ((uint64_t)data[2]) << 24;
 111         reg |= ((uint64_t)data[3]) << 16;
 112         reg |= ((uint64_t)data[4]) << 8;
 113         reg |= ((uint64_t)data[5]) << 0;
 114         return reg;
 115     }
 116
 117 };
 118
 119 std::ostream &operator<<(std::ostream &stream, const EthAddr &ea);
 120 bool operator==(const EthAddr &left, const EthAddr &right);
 121
 122 struct EthHdr : public eth_hdr
 123 {
 124     bool isVlan() const { return (ntohs(eth_type) == ETH_TYPE_8021Q); }
 125     uint16_t type() const {
 126         if (!isVlan())
 127             return ntohs(eth_type);
 128         else
 129             // L3 type is now 16 bytes into the hdr with 802.1Q
 130             // instead of 12.  dnet/eth.h only supports 802.1
 131             return ntohs(*((uint16_t*)(((uint8_t *)this) + 16)));
 132     }
 133     uint16_t vlanId() const {
 134         if (isVlan())
 135             return ntohs(*((uint16_t*)(((uint8_t *)this) + 14)));
 136         else
 137             return 0x0000;
 138     }
 139
 140     const EthAddr &src() const { return *(EthAddr *)&eth_src; }
 141     const EthAddr &dst() const { return *(EthAddr *)&eth_dst; }
 142
 143     int size() const {
 144         if (!isVlan())
 145             return sizeof(eth_hdr);
 146         else
 147             return (sizeof(eth_hdr)+4);
 148     }
 149
 150     const uint8_t *bytes() const { return (const uint8_t *)this; }
 151     const uint8_t *payload() const { return bytes() + size(); }
 152     uint8_t *bytes() { return (uint8_t *)this; }
 153     uint8_t *payload() { return bytes() + size(); }
 154 };
 155
 156 class EthPtr
 157 {
 158   protected:
 159     friend class IpPtr;
 160     friend class Ip6Ptr;
 161     EthPacketPtr p;
 162
 163   public:
 164     EthPtr() {}
 165     EthPtr(const EthPacketPtr &ptr) : p(ptr) { }
 166
 167     EthHdr *operator->() { return (EthHdr *)p->data; }
 168     EthHdr &operator*() { return *(EthHdr *)p->data; }
 169     operator EthHdr *() { return (EthHdr *)p->data; }
 170
 171     const EthHdr *operator->() const { return (const EthHdr *)p->data; }
 172     const EthHdr &operator*() const { return *(const EthHdr *)p->data; }
 173     operator const EthHdr *() const { return (const EthHdr *)p->data; }
 174
 175     const EthPtr &operator=(const EthPacketPtr &ptr) { p = ptr; return *this; }
 176
 177     const EthPacketPtr packet() const { return p; }
 178     EthPacketPtr packet() { return p; }
 179     bool operator!() const { return !p; }
 180     operator bool() const { return (p != nullptr); }
 181     int off() const { return 0; }
 182     int pstart() const { return off() + ((const EthHdr*)p->data)->size(); }
 183 };
 184
 185 /*
 186  * IP Stuff
 187  */
 188 struct IpAddress
 189 {
 190   protected:
 191     uint32_t _ip;
 192
 193   public:
 194     IpAddress() : _ip(0)
 195     {}
 196     IpAddress(const uint32_t __ip) : _ip(__ip)
 197     {}
 198
 199     uint32_t ip() const { return _ip; }
 200
 201     std::string string() const;
 202 };
 203
 204 std::ostream &operator<<(std::ostream &stream, const IpAddress &ia);
 205 bool operator==(const IpAddress &left, const IpAddress &right);
 206
 207 struct IpNetmask : public IpAddress
 208 {
 209   protected:
 210     uint8_t _netmask;
 211
 212   public:
 213     IpNetmask() : IpAddress(), _netmask(0)
 214     {}
 215     IpNetmask(const uint32_t __ip, const uint8_t __netmask) :
 216         IpAddress(__ip), _netmask(__netmask)
 217     {}
 218
 219     uint8_t netmask() const { return _netmask; }
 220
 221     std::string string() const;
 222 };
 223
 224 std::ostream &operator<<(std::ostream &stream, const IpNetmask &in);
 225 bool operator==(const IpNetmask &left, const IpNetmask &right);
 226
 227 struct IpWithPort : public IpAddress
 228 {
 229   protected:
 230     uint16_t _port;
 231
 232   public:
 233     IpWithPort() : IpAddress(), _port(0)
 234     {}
 235     IpWithPort(const uint32_t __ip, const uint16_t __port) :
 236         IpAddress(__ip), _port(__port)
 237     {}
 238
 239     uint8_t port() const { return _port; }
 240
 241     std::string string() const;
 242 };
 243
 244 std::ostream &operator<<(std::ostream &stream, const IpWithPort &iwp);
 245 bool operator==(const IpWithPort &left, const IpWithPort &right);
 246
 247 struct IpOpt;
 248 struct IpHdr : public ip_hdr
 249 {
 250     uint8_t  version() const { return ip_v; }
 251     uint8_t  hlen() const { return ip_hl * 4; }
 252     uint8_t  tos() const { return ip_tos; }
 253     uint16_t len() const { return ntohs(ip_len); }
 254     uint16_t id() const { return ntohs(ip_id); }
 255     uint16_t frag_flags() const { return ntohs(ip_off) >> 13; }
 256     uint16_t frag_off() const { return ntohs(ip_off) & 0x1fff; }
 257     uint8_t  ttl() const { return ip_ttl; }
 258     uint8_t  proto() const { return ip_p; }
 259     uint16_t sum() const { return ip_sum; }
 260     uint32_t src() const { return ntohl(ip_src); }
 261     uint32_t dst() const { return ntohl(ip_dst); }
 262
 263     void sum(uint16_t sum) { ip_sum = sum; }
 264     void id(uint16_t _id) { ip_id = htons(_id); }
 265     void len(uint16_t _len) { ip_len = htons(_len); }
 266
 267     bool options(std::vector<const IpOpt *> &vec) const;
 268
 269     int size() const { return hlen(); }
 270     const uint8_t *bytes() const { return (const uint8_t *)this; }
 271     const uint8_t *payload() const { return bytes() + size(); }
 272     uint8_t *bytes() { return (uint8_t *)this; }
 273     uint8_t *payload() { return bytes() + size(); }
 274 };
 275
 276 class IpPtr
 277 {
 278   protected:
 279     friend class TcpPtr;
 280     friend class UdpPtr;
 281     EthPacketPtr p;
 282     bool eth_hdr_vlan;
 283
 284     void set(const EthPacketPtr &ptr)
 285     {
 286         p = 0;
 287         eth_hdr_vlan = false;
 288
 289         if (ptr) {
 290             EthHdr *eth = (EthHdr *)ptr->data;
 291             if (eth->type() == ETH_TYPE_IP)
 292                 p = ptr;
 293             if (eth->isVlan())
 294                 eth_hdr_vlan = true;
 295         }
 296     }
 297
 298   public:
 299     IpPtr() : p(0), eth_hdr_vlan(false) {}
 300     IpPtr(const EthPacketPtr &ptr) : p(0), eth_hdr_vlan(false) { set(ptr); }
 301     IpPtr(const EthPtr &ptr) : p(0), eth_hdr_vlan(false) { set(ptr.p); }
 302     IpPtr(const IpPtr &ptr) : p(ptr.p), eth_hdr_vlan(ptr.eth_hdr_vlan) { }
 303
 304     IpHdr *get() { return (IpHdr *)(p->data + sizeof(eth_hdr) +
 305                                    ((eth_hdr_vlan) ? 4 : 0)); }
 306     IpHdr *operator->() { return get(); }
 307     IpHdr &operator*() { return *get(); }
 308
 309     const IpHdr *get() const
 310     { return (const IpHdr *)(p->data + sizeof(eth_hdr) +
 311                             ((eth_hdr_vlan) ? 4 : 0)); }
 312     const IpHdr *operator->() const { return get(); }
 313     const IpHdr &operator*() const { return *get(); }
 314
 315     const IpPtr &operator=(const EthPacketPtr &ptr) { set(ptr); return *this; }
 316     const IpPtr &operator=(const EthPtr &ptr) { set(ptr.p); return *this; }
 317     const IpPtr &operator=(const IpPtr &ptr) { p = ptr.p; return *this; }
 318
 319     const EthPacketPtr packet() const { return p; }
 320     EthPacketPtr packet() { return p; }
 321     bool operator!() const { return !p; }
 322     operator bool() const { return (p != nullptr); }
 323     int off() const { return (sizeof(eth_hdr) + ((eth_hdr_vlan) ? 4 : 0)); }
 324     int pstart() const { return (off() + get()->size()); }
 325 };
 326
 327 uint16_t cksum(const IpPtr &ptr);
 328
 329 struct IpOpt : public ip_opt
 330 {
 331     uint8_t type() const { return opt_type; }
 332     uint8_t typeNumber() const { return IP_OPT_NUMBER(opt_type); }
 333     uint8_t typeClass() const { return IP_OPT_CLASS(opt_type); }
 334     uint8_t typeCopied() const { return IP_OPT_COPIED(opt_type); }
 335     uint8_t len() const { return IP_OPT_TYPEONLY(type()) ? 1 : opt_len; }
 336
 337     bool isNumber(int num) const { return typeNumber() == IP_OPT_NUMBER(num); }
 338     bool isClass(int cls) const { return typeClass() == IP_OPT_CLASS(cls); }
 339     bool isCopied(int cpy) const { return typeCopied() == IP_OPT_COPIED(cpy); }
 340
 341     const uint8_t *data() const { return opt_data.data8; }
 342     void sec(ip_opt_data_sec &sec) const;
 343     void lsrr(ip_opt_data_rr &rr) const;
 344     void ssrr(ip_opt_data_rr &rr) const;
 345     void ts(ip_opt_data_ts &ts) const;
 346     uint16_t satid() const { return ntohs(opt_data.satid); }
 347     uint16_t mtup() const { return ntohs(opt_data.mtu); }
 348     uint16_t mtur() const { return ntohs(opt_data.mtu); }
 349     void tr(ip_opt_data_tr &tr) const;
 350     uint16_t rtralt() const { return ntohs(opt_data.rtralt); }
 351     void sdb(std::vector<uint32_t> &vec) const;
 352 };
 353
 354 /*
 355  * Ip6 Classes
 356  */
 357 struct Ip6Opt;
 358 struct Ip6Hdr : public ip6_hdr
 359 {
 360     uint8_t version() const { return ip6_vfc; }
 361     uint32_t flow() const { return ntohl(ip6_flow); }
 362     uint16_t plen() const { return ntohs(ip6_plen); }
 363     uint16_t hlen() const { return IP6_HDR_LEN; }
 364     uint8_t nxt() const { return ip6_nxt; }
 365     uint8_t hlim() const { return ip6_hlim; }
 366
 367     const uint8_t* src() const { return ip6_src.data; }
 368     const uint8_t* dst() const { return ip6_dst.data; }
 369
 370     int extensionLength() const;
 371     const Ip6Opt* getExt(uint8_t ext) const;
 372     const Ip6Opt* fragmentExt() const { return getExt(IP_PROTO_FRAGMENT); }
 373     const Ip6Opt* rtTypeExt() const { return getExt(IP_PROTO_ROUTING); }
 374     const Ip6Opt* dstOptExt() const { return getExt(IP_PROTO_DSTOPTS); }
 375     uint8_t proto() const;
 376
 377     void plen(uint16_t _plen) { ip6_plen = htons(_plen); }
 378
 379     int size() const { return IP6_HDR_LEN + extensionLength(); }
 380     const uint8_t *bytes() const { return (const uint8_t *)this; }
 381     const uint8_t *payload() const { return bytes() + IP6_HDR_LEN
 382                                             + extensionLength(); }
 383     uint8_t *bytes() { return (uint8_t *)this; }
 384     uint8_t *payload() { return bytes() + IP6_HDR_LEN
 385                                 + extensionLength(); }
 386 };
 387
 388 class Ip6Ptr
 389 {
 390   protected:
 391     friend class TcpPtr;
 392     friend class UdpPtr;
 393     EthPacketPtr p;
 394     bool eth_hdr_vlan;
 395
 396     void set(const EthPacketPtr &ptr)
 397     {
 398         p = 0;
 399         eth_hdr_vlan = false;
 400
 401         if (ptr) {
 402             EthHdr *eth = (EthHdr *)ptr->data;
 403             if (eth->type() == ETH_TYPE_IPV6)
 404                 p = ptr;
 405             if (eth->isVlan())
 406                 eth_hdr_vlan = true;
 407         }
 408     }
 409
 410   public:
 411     Ip6Ptr() : p(0), eth_hdr_vlan(false) {}
 412     Ip6Ptr(const EthPacketPtr &ptr) : p(0), eth_hdr_vlan(false) { set(ptr); }
 413     Ip6Ptr(const EthPtr &ptr) : p(0), eth_hdr_vlan(false) { set(ptr.p); }
 414     Ip6Ptr(const Ip6Ptr &ptr) : p(ptr.p), eth_hdr_vlan(ptr.eth_hdr_vlan) { }
 415
 416     Ip6Hdr *get() { return (Ip6Hdr *)(p->data + sizeof(eth_hdr)
 417                                       + ((eth_hdr_vlan) ? 4 : 0)); }
 418     Ip6Hdr *operator->() { return get(); }
 419     Ip6Hdr &operator*() { return *get(); }
 420
 421     const Ip6Hdr *get() const
 422     { return (const Ip6Hdr *)(p->data + sizeof(eth_hdr)
 423                               + ((eth_hdr_vlan) ? 4 : 0)); }
 424     const Ip6Hdr *operator->() const { return get(); }
 425     const Ip6Hdr &operator*() const { return *get(); }
 426
 427     const Ip6Ptr &operator=(const EthPacketPtr &ptr)
 428     { set(ptr); return *this; }
 429     const Ip6Ptr &operator=(const EthPtr &ptr)
 430     { set(ptr.p); return *this; }
 431     const Ip6Ptr &operator=(const Ip6Ptr &ptr)
 432     { p = ptr.p; return *this; }
 433
 434     const EthPacketPtr packet() const { return p; }
 435     EthPacketPtr packet() { return p; }
 436     bool operator!() const { return !p; }
 437     operator bool() const { return (p != nullptr); }
 438     int off() const { return sizeof(eth_hdr) + ((eth_hdr_vlan) ? 4 : 0); }
 439     int pstart() const { return off() + get()->size(); }
 440 };
 441
 442 // Dnet supplied ipv6 opt header is incomplete and
 443 // newer NIC card filters expect a more robust
 444 // ipv6 header option declaration.
 445 struct ip6_opt_fragment {
 446     uint16_t offlg;
 447     uint32_t ident;
 448 };
 449
 450 struct ip6_opt_routing_type2 {
 451     uint8_t type;
 452     uint8_t segleft;
 453     uint32_t reserved;
 454     ip6_addr_t addr;
 455 };
 456
 457 #define HOME_ADDRESS_OPTION 0xC9
 458 struct ip6_opt_dstopts {
 459     uint8_t type;
 460     uint8_t length;
 461     ip6_addr_t addr;
 462 } __attribute__((packed));
 463
 464 struct ip6_opt_hdr
 465 {
 466     uint8_t ext_nxt;
 467     uint8_t ext_len;
 468     union {
 469         struct ip6_opt_fragment fragment;
 470         struct ip6_opt_routing_type2 rtType2;
 471         struct ip6_opt_dstopts dstOpts;
 472     } ext_data;
 473 } __attribute__((packed));
 474
 475 struct Ip6Opt : public ip6_opt_hdr
 476 {
 477     uint8_t nxt() const { return ext_nxt; }
 478     uint8_t extlen() const { return ext_len; }
 479     uint8_t len() const { return extlen() + 8; }
 480
 481     // Supporting the types of header extensions likely to be encountered:
 482     // fragment, routing type 2 and dstopts.
 483
 484     // Routing type 2
 485     uint8_t  rtType2Type() const { return ext_data.rtType2.type; }
 486     uint8_t  rtType2SegLft() const { return ext_data.rtType2.segleft; }
 487     const uint8_t* rtType2Addr() const { return ext_data.rtType2.addr.data; }
 488
 489     // Fragment
 490     uint16_t fragmentOfflg() const { return ntohs(ext_data.fragment.offlg); }
 491     uint32_t fragmentIdent() const { return ntohl(ext_data.fragment.ident); }
 492
 493     // Dst Options/Home Address Option
 494     uint8_t dstOptType() const { return ext_data.dstOpts.type; }
 495     uint8_t dstOptLength() const { return ext_data.dstOpts.length; }
 496     const uint8_t* dstOptAddr() const { return ext_data.dstOpts.addr.data; }
 497 };
 498
 499
 500 /*
 501  * TCP Stuff
 502  */
 503 struct TcpOpt;
 504 struct TcpHdr : public tcp_hdr
 505 {
 506     uint16_t sport() const { return ntohs(th_sport); }
 507     uint16_t dport() const { return ntohs(th_dport); }
 508     uint32_t seq() const { return ntohl(th_seq); }
 509     uint32_t ack() const { return ntohl(th_ack); }
 510     uint8_t  off() const { return th_off*4; }
 511     uint8_t  flags() const { return th_flags & 0x3f; }
 512     uint16_t win() const { return ntohs(th_win); }
 513     uint16_t sum() const { return th_sum; }
 514     uint16_t urp() const { return ntohs(th_urp); }
 515
 516     void sum(uint16_t sum) { th_sum = sum; }
 517     void seq(uint32_t _seq) { th_seq = htonl(_seq); }
 518     void flags(uint8_t _flags) { th_flags  = _flags; }
 519
 520     bool options(std::vector<const TcpOpt *> &vec) const;
 521
 522     int size() const { return off(); }
 523     const uint8_t *bytes() const { return (const uint8_t *)this; }
 524     const uint8_t *payload() const { return bytes() + size(); }
 525     uint8_t *bytes() { return (uint8_t *)this; }
 526     uint8_t *payload() { return bytes() + size(); }
 527 };
 528
 529 class TcpPtr
 530 {
 531   protected:
 532     EthPacketPtr p;
 533     int _off;
 534
 535     void set(const EthPacketPtr &ptr, int offset) { p = ptr; _off = offset; }
 536     void set(const IpPtr &ptr)
 537     {
 538         if (ptr && ptr->proto() == IP_PROTO_TCP)
 539             set(ptr.p, ptr.pstart());
 540         else
 541             set(0, 0);
 542     }
 543     void set(const Ip6Ptr &ptr)
 544     {
 545         if (ptr && ptr->proto() == IP_PROTO_TCP)
 546             set(ptr.p, ptr.pstart());
 547         else
 548             set(0, 0);
 549     }
 550
 551   public:
 552     TcpPtr() : p(0), _off(0) {}
 553     TcpPtr(const IpPtr &ptr) : p(0), _off(0) { set(ptr); }
 554     TcpPtr(const Ip6Ptr &ptr) : p(0), _off(0) { set(ptr); }
 555     TcpPtr(const TcpPtr &ptr) : p(ptr.p), _off(ptr._off) {}
 556
 557     TcpHdr *get() { return (TcpHdr *)(p->data + _off); }
 558     TcpHdr *operator->() { return get(); }
 559     TcpHdr &operator*() { return *get(); }
 560
 561     const TcpHdr *get() const { return (const TcpHdr *)(p->data + _off); }
 562     const TcpHdr *operator->() const { return get(); }
 563     const TcpHdr &operator*() const { return *get(); }
 564
 565     const TcpPtr &operator=(const IpPtr &i)
 566     { set(i); return *this; }
 567     const TcpPtr &operator=(const TcpPtr &t)
 568     { set(t.p, t._off); return *this; }
 569
 570     const EthPacketPtr packet() const { return p; }
 571     EthPacketPtr packet() { return p; }
 572     bool operator!() const { return !p; }
 573     operator bool() const { return (p != nullptr); }
 574     int off() const { return _off; }
 575     int pstart() const { return off() + get()->size(); }
 576 };
 577
 578 uint16_t cksum(const TcpPtr &ptr);
 579
 580 struct TcpOpt : public tcp_opt
 581 {
 582     uint8_t type() const { return opt_type; }
 583     uint8_t len() const { return TCP_OPT_TYPEONLY(type()) ? 1 : opt_len; }
 584
 585     bool isopt(int opt) const { return type() == opt; }
 586
 587     const uint8_t *data() const { return opt_data.data8; }
 588
 589     uint16_t mss() const { return ntohs(opt_data.mss); }
 590     uint8_t wscale() const { return opt_data.wscale; }
 591     uint32_t echo() const { return ntohl(opt_data.echo); }
 592     uint32_t tsval() const { return ntohl(opt_data.timestamp[0]); }
 593     uint32_t tsecr() const { return ntohl(opt_data.timestamp[1]); }
 594     uint32_t cc() const { return ntohl(opt_data.cc); }
 595     uint8_t cksum() const{ return opt_data.cksum; }
 596     const uint8_t *md5() const { return opt_data.md5; }
 597
 598     int size() const { return len(); }
 599     const uint8_t *bytes() const { return (const uint8_t *)this; }
 600     const uint8_t *payload() const { return bytes() + size(); }
 601     uint8_t *bytes() { return (uint8_t *)this; }
 602     uint8_t *payload() { return bytes() + size(); }
 603 };
 604
 605 /*
 606  * UDP Stuff
 607  */
 608 struct UdpHdr : public udp_hdr
 609 {
 610     uint16_t sport() const { return ntohs(uh_sport); }
 611     uint16_t dport() const { return ntohs(uh_dport); }
 612     uint16_t len() const { return ntohs(uh_ulen); }
 613     uint16_t sum() const { return uh_sum; }
 614
 615     void sum(uint16_t sum) { uh_sum = sum; }
 616     void len(uint16_t _len) { uh_ulen = htons(_len); }
 617
 618     int size() const { return sizeof(udp_hdr); }
 619     const uint8_t *bytes() const { return (const uint8_t *)this; }
 620     const uint8_t *payload() const { return bytes() + size(); }
 621     uint8_t *bytes() { return (uint8_t *)this; }
 622     uint8_t *payload() { return bytes() + size(); }
 623 };
 624
 625 class UdpPtr
 626 {
 627   protected:
 628     EthPacketPtr p;
 629     int _off;
 630
 631     void set(const EthPacketPtr &ptr, int offset) { p = ptr; _off = offset; }
 632     void set(const IpPtr &ptr)
 633     {
 634         if (ptr && ptr->proto() == IP_PROTO_UDP)
 635             set(ptr.p, ptr.pstart());
 636         else
 637             set(0, 0);
 638     }
 639     void set(const Ip6Ptr &ptr)
 640     {
 641         if (ptr && ptr->proto() == IP_PROTO_UDP)
 642             set(ptr.p, ptr.pstart());
 643         else
 644             set(0, 0);
 645     }
 646
 647   public:
 648     UdpPtr() : p(0), _off(0) {}
 649     UdpPtr(const IpPtr &ptr) : p(0), _off(0) { set(ptr); }
 650     UdpPtr(const Ip6Ptr &ptr) : p(0), _off(0) { set(ptr); }
 651     UdpPtr(const UdpPtr &ptr) : p(ptr.p), _off(ptr._off) {}
 652
 653     UdpHdr *get() { return (UdpHdr *)(p->data + _off); }
 654     UdpHdr *operator->() { return get(); }
 655     UdpHdr &operator*() { return *get(); }
 656
 657     const UdpHdr *get() const { return (const UdpHdr *)(p->data + _off); }
 658     const UdpHdr *operator->() const { return get(); }
 659     const UdpHdr &operator*() const { return *get(); }
 660
 661     const UdpPtr &operator=(const IpPtr &i) { set(i); return *this; }
 662     const UdpPtr &operator=(const UdpPtr &t)
 663     { set(t.p, t._off); return *this; }
 664
 665     const EthPacketPtr packet() const { return p; }
 666     EthPacketPtr packet() { return p; }
 667     bool operator!() const { return !p; }
 668     operator bool() const { return (p != nullptr); }
 669     int off() const { return _off; }
 670     int pstart() const { return off() + get()->size(); }
 671 };
 672
 673 uint16_t __tu_cksum6(const Ip6Ptr &ip6);
 674 uint16_t __tu_cksum(const IpPtr &ip);
 675 uint16_t cksum(const UdpPtr &ptr);
 676
 677 int hsplit(const EthPacketPtr &ptr);
 678
 679 } // namespace Net
 680
 681 #endif // __BASE_INET_HH__