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ipv4-header.h
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2005 INRIA
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation;
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17  *
18  * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
19  */
20 
21 #ifndef IPV4_HEADER_H
22 #define IPV4_HEADER_H
23 
24 #include "ns3/header.h"
25 #include "ns3/ipv4-address.h"
26 
27 namespace ns3 {
31 class Ipv4Header : public Header
32 {
33 public:
37  Ipv4Header ();
41  void EnableChecksum (void);
45  void SetPayloadSize (uint16_t size);
51  void SetIdentification (uint16_t identification);
55  void SetTos (uint8_t tos);
64  enum DscpType
65  {
66  DscpDefault = 0x00,
67 
68  // Prefixed with "DSCP" to avoid name clash (bug 1723)
69  DSCP_CS1 = 0x20,
70  DSCP_AF11 = 0x28,
71  DSCP_AF12 = 0x30,
72  DSCP_AF13 = 0x38,
73 
74  DSCP_CS2 = 0x40,
75  DSCP_AF21 = 0x48,
76  DSCP_AF22 = 0x50,
77  DSCP_AF23 = 0x58,
78 
79  DSCP_CS3 = 0x60,
80  DSCP_AF31 = 0x68,
81  DSCP_AF32 = 0x70,
82  DSCP_AF33 = 0x78,
83 
84  DSCP_CS4 = 0x80,
85  DSCP_AF41 = 0x88,
86  DSCP_AF42 = 0x90,
87  DSCP_AF43 = 0x98,
88 
89  DSCP_CS5 = 0xA0,
90  DSCP_EF = 0xB8,
91 
92  DSCP_CS6 = 0xC0,
93  DSCP_CS7 = 0xE0
94 
95  };
100  void SetDscp (DscpType dscp);
101 
106  enum EcnType
107  {
108  // Prefixed with "ECN" to avoid name clash (bug 1723)
109  ECN_NotECT = 0x00,
110  ECN_ECT1 = 0x01,
111  ECN_ECT0 = 0x02,
112  ECN_CE = 0x03
113  };
118  void SetEcn (EcnType ecn);
122  void SetMoreFragments (void);
126  void SetLastFragment (void);
130  void SetDontFragment (void);
134  void SetMayFragment (void);
141  void SetFragmentOffset (uint16_t offsetBytes);
145  void SetTtl (uint8_t ttl);
149  void SetProtocol (uint8_t num);
153  void SetSource (Ipv4Address source);
157  void SetDestination (Ipv4Address destination);
161  uint16_t GetPayloadSize (void) const;
165  uint16_t GetIdentification (void) const;
169  uint8_t GetTos (void) const;
173  DscpType GetDscp (void) const;
177  std::string DscpTypeToString (DscpType dscp) const;
181  EcnType GetEcn (void) const;
185  std::string EcnTypeToString (EcnType ecn) const;
189  bool IsLastFragment (void) const;
193  bool IsDontFragment (void) const;
197  uint16_t GetFragmentOffset (void) const;
201  uint8_t GetTtl (void) const;
205  uint8_t GetProtocol (void) const;
209  Ipv4Address GetSource (void) const;
213  Ipv4Address GetDestination (void) const;
214 
221  bool IsChecksumOk (void) const;
222 
223  static TypeId GetTypeId (void);
224  virtual TypeId GetInstanceTypeId (void) const;
225  virtual void Print (std::ostream &os) const;
226  virtual uint32_t GetSerializedSize (void) const;
227  virtual void Serialize (Buffer::Iterator start) const;
228  virtual uint32_t Deserialize (Buffer::Iterator start);
229 private:
230 
231  enum FlagsE {
232  DONT_FRAGMENT = (1<<0),
233  MORE_FRAGMENTS = (1<<1)
234  };
235 
237 
238  uint16_t m_payloadSize;
240  uint32_t m_tos : 8; //Also used as DSCP + ECN value
241  uint32_t m_ttl : 8;
242  uint32_t m_protocol : 8;
243  uint32_t m_flags : 3;
247  uint16_t m_checksum;
249  uint16_t m_headerSize;
250 };
251 
252 } // namespace ns3
253 
254 
255 #endif /* IPV4_HEADER_H */