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. 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  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 ();
  const char *if_up ();

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

//extern tap_device *tap_device ();

#endif

Revision:	1.21
Committed:	Sun Dec 2 00:09:36 2007 UTC (16 years, 5 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.20:	+8 -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	1.20	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20	pcg	1.1	*/
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	pcg	1.21	struct net_packet
33			{
34	pcg	1.1	u32 len; // actually u16, but padding...
35
36	pcg	1.4	u8 &operator[] (u16 offset) const;
37	pcg	1.16	u8 *at (u16 offset) const;
38	pcg	1.2
39	pcg	1.5	void unshift_hdr (u16 hdrsize)
40			{
41			memmove ((void )&(this)[hdrsize], (void )&(this)[0], len);
42			len += hdrsize;
43			}
44
45	pcg	1.2	void skip_hdr (u16 hdrsize)
46			{
47	pcg	1.5	len -= hdrsize;
48			memmove ((void )&(this)[0], (void )&(this)[hdrsize], len);
49	pcg	1.2	}
50	pcg	1.1
51	pcg	1.4	void set (const net_packet &pkt)
52			{
53			len = pkt.len;
54			memcpy (&((*this)[0]), &(pkt[0]), len);
55			}
56
57	pcg	1.10	bool is_ipv4 () const
58			{
59			return (this)[12] == 0x08 && (this)[13] == 0x00 // IP
60			&& ((*this)[14] & 0xf0) == 0x40; // IPv4
61			}
62
63			u32 &ipv4_src () const
64			{
65			return (u32 )&(*this)[26];
66			}
67
68			u32 &ipv4_dst () const
69			{
70			return (u32 )&(*this)[30];
71			}
72
73			bool is_arp () const
74	pcg	1.1	{
75			return (this)[12] == 0x08 && (this)[13] == 0x06 // 0806 protocol
76			&& (this)[14] == 0x00 && (this)[15] == 0x01 // 0001 hw_format
77			&& (this)[16] == 0x08 && (this)[17] == 0x00 // 0800 prot_format
78			&& (this)[18] == 0x06 && (this)[19] == 0x04; // 06 hw_len 04 prot_len
79			}
80
81			void *operator new (size_t s);
82			void operator delete (void *p);
83			};
84
85	pcg	1.21	struct data_packet : net_packet
86			{
87	pcg	1.1	u8 data_[MAXSIZE];
88			};
89
90			inline
91	pcg	1.4	u8 &net_packet::operator[] (u16 offset) const
92	pcg	1.1	{
93			return ((data_packet *)this)->data_[offset];
94			}
95
96	pcg	1.16	inline
97			u8 *net_packet::at (u16 offset) const
98			{
99			return &((*this)[offset]);
100			}
101
102	pcg	1.21	struct tap_packet : net_packet
103			{
104	pcg	1.1	mac dst;
105			mac src;
106			u8 data[MAXSIZE - 12];
107			};
108
109	pcg	1.21	struct tap_device
110			{
111	pcg	1.1	int fd;
112
113	pcg	1.7	// network interface name or identifier
114	pcg	1.6	char ifrname[IFNAMESIZE + 1];
115	pcg	1.1
116	pcg	1.14	char *device;
117
118	pcg	1.8	tap_device ();
119			~tap_device ();
120
121			//bool open ();
122			//void close ();
123	pcg	1.1
124			const char *interface () { return ifrname; }
125	pcg	1.6	const char *info ();
126	pcg	1.19	const char *if_up ();
127	pcg	1.1
128			tap_packet *recv ();
129			void send (tap_packet *pkt);
130			};
131	pcg	1.7
132	pcg	1.8	//extern tap_device *tap_device ();
133	pcg	1.1
134			#endif
135