gvpe/src/device.h

/*
    device.h -- generic header for device.c
    Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
 
    This file is part of GVPE.

    GVPE is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with gvpe; if not, write to the Free Software
    Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef GVPE_DEVICE_H__
#define GVPE_DEVICE_H__

#include "config.h"

#define IFNAMESIZE 256 // be conservative

#include "global.h"
#include "util.h"

struct net_packet {
  u32 len; // actually u16, but padding...

  u8 &operator[] (u16 offset) const;
  u8 *at (u16 offset) const;

  void unshift_hdr (u16 hdrsize)
    {
      memmove ((void *)&(*this)[hdrsize], (void *)&(*this)[0], len);
      len += hdrsize;
    }

  void skip_hdr (u16 hdrsize)
    {
      len -= hdrsize;
      memmove ((void *)&(*this)[0], (void *)&(*this)[hdrsize], len);
    }

  void set (const net_packet &pkt)
    {
      len = pkt.len;
      memcpy (&((*this)[0]), &(pkt[0]), len);
    }

  bool is_ipv4 () const
    {
      return (*this)[12] == 0x08 && (*this)[13] == 0x00 // IP
          && ((*this)[14] & 0xf0) == 0x40;              // IPv4
    }

  u32 &ipv4_src () const
    {
      return *(u32 *)&(*this)[26];
    }
  
  u32 &ipv4_dst () const
    {
      return *(u32 *)&(*this)[30];
    }
  
  bool is_arp () const
    {
      return (*this)[12] == 0x08 && (*this)[13] == 0x06         // 0806 protocol
          && (*this)[14] == 0x00 && (*this)[15] == 0x01         // 0001 hw_format
          && (*this)[16] == 0x08 && (*this)[17] == 0x00         // 0800 prot_format
          && (*this)[18] == 0x06 && (*this)[19] == 0x04;        // 06 hw_len 04 prot_len
    }

  void *operator new (size_t s);
  void operator delete (void *p);
};

struct data_packet : net_packet {
  u8 data_[MAXSIZE];
};

inline 
u8 &net_packet::operator[] (u16 offset) const
{
  return ((data_packet *)this)->data_[offset];
}

inline 
u8 *net_packet::at (u16 offset) const
{
  return &((*this)[offset]);
}

struct tap_packet : net_packet {
  mac dst;
  mac src;
  u8 data[MAXSIZE - 12];
};

struct tap_device {
  int fd;

  // network interface name or identifier
  char ifrname[IFNAMESIZE + 1];

  char *device;

  tap_device ();
  ~tap_device ();

  //bool open ();
  //void close ();

  const char *interface () { return ifrname; }
  const char *info ();

  tap_packet *recv ();
  void send (tap_packet *pkt);
};

//extern tap_device *tap_device ();

#endif

Revision:	1.18
Committed:	Fri Mar 18 01:53:05 2005 UTC (19 years, 2 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-1_8
Changes since 1.17:	+4 -4 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			device.h -- generic header for device.c
3	pcg	1.17	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
4	pcg	1.1
5	pcg	1.17	This file is part of GVPE.
6
7			GVPE is free software; you can redistribute it and/or modify
8	pcg	1.1	it under the terms of the GNU General Public License as published by
9			the Free Software Foundation; either version 2 of the License, or
10			(at your option) any later version.
11
12			This program is distributed in the hope that it will be useful,
13			but WITHOUT ANY WARRANTY; without even the implied warranty of
14			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			GNU General Public License for more details.
16
17			You should have received a copy of the GNU General Public License
18	pcg	1.17	along with gvpe; if not, write to the Free Software
19	pcg	1.1	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20			*/
21
22	pcg	1.18	#ifndef GVPE_DEVICE_H__
23			#define GVPE_DEVICE_H__
24
25			#include "config.h"
26	pcg	1.1
27	pcg	1.7	#define IFNAMESIZE 256 // be conservative
28	pcg	1.1
29			#include "global.h"
30	pcg	1.12	#include "util.h"
31	pcg	1.1
32			struct net_packet {
33			u32 len; // actually u16, but padding...
34
35	pcg	1.4	u8 &operator[] (u16 offset) const;
36	pcg	1.16	u8 *at (u16 offset) const;
37	pcg	1.2
38	pcg	1.5	void unshift_hdr (u16 hdrsize)
39			{
40			memmove ((void )&(this)[hdrsize], (void )&(this)[0], len);
41			len += hdrsize;
42			}
43
44	pcg	1.2	void skip_hdr (u16 hdrsize)
45			{
46	pcg	1.5	len -= hdrsize;
47			memmove ((void )&(this)[0], (void )&(this)[hdrsize], len);
48	pcg	1.2	}
49	pcg	1.1
50	pcg	1.4	void set (const net_packet &pkt)
51			{
52			len = pkt.len;
53			memcpy (&((*this)[0]), &(pkt[0]), len);
54			}
55
56	pcg	1.10	bool is_ipv4 () const
57			{
58			return (this)[12] == 0x08 && (this)[13] == 0x00 // IP
59			&& ((*this)[14] & 0xf0) == 0x40; // IPv4
60			}
61
62			u32 &ipv4_src () const
63			{
64			return (u32 )&(*this)[26];
65			}
66
67			u32 &ipv4_dst () const
68			{
69			return (u32 )&(*this)[30];
70			}
71
72			bool is_arp () const
73	pcg	1.1	{
74			return (this)[12] == 0x08 && (this)[13] == 0x06 // 0806 protocol
75			&& (this)[14] == 0x00 && (this)[15] == 0x01 // 0001 hw_format
76			&& (this)[16] == 0x08 && (this)[17] == 0x00 // 0800 prot_format
77			&& (this)[18] == 0x06 && (this)[19] == 0x04; // 06 hw_len 04 prot_len
78			}
79
80			void *operator new (size_t s);
81			void operator delete (void *p);
82			};
83
84			struct data_packet : net_packet {
85			u8 data_[MAXSIZE];
86			};
87
88			inline
89	pcg	1.4	u8 &net_packet::operator[] (u16 offset) const
90	pcg	1.1	{
91			return ((data_packet *)this)->data_[offset];
92			}
93
94	pcg	1.16	inline
95			u8 *net_packet::at (u16 offset) const
96			{
97			return &((*this)[offset]);
98			}
99
100	pcg	1.1	struct tap_packet : net_packet {
101			mac dst;
102			mac src;
103			u8 data[MAXSIZE - 12];
104			};
105
106	pcg	1.9	struct tap_device {
107	pcg	1.1	int fd;
108
109	pcg	1.7	// network interface name or identifier
110	pcg	1.6	char ifrname[IFNAMESIZE + 1];
111	pcg	1.1
112	pcg	1.14	char *device;
113
114	pcg	1.8	tap_device ();
115			~tap_device ();
116
117			//bool open ();
118			//void close ();
119	pcg	1.1
120			const char *interface () { return ifrname; }
121	pcg	1.6	const char *info ();
122	pcg	1.1
123			tap_packet *recv ();
124			void send (tap_packet *pkt);
125			};
126	pcg	1.7
127	pcg	1.8	//extern tap_device *tap_device ();
128	pcg	1.1
129			#endif
130