gvpe/src/device.h

/*
    device.h -- generic header for device.c
    Copyright (C) 2003 Marc Lehmann <pcg@goof.com>
 
    This program 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 this program; if not, write to the Free Software
    Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef VPE_DEVICE_H__
#define VPE_DEVICE_H__

#define IFNAMESIZE 256 // be conservative

#include "gettext.h"

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

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

  u8 &operator[] (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];
}

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];

  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:	1.13
Committed:	Thu Oct 16 20:13:21 2003 UTC (20 years, 7 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.12:	+0 -2 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			device.h -- generic header for device.c
3	pcg	1.11	Copyright (C) 2003 Marc Lehmann <pcg@goof.com>
4	pcg	1.1
5			This program is free software; you can redistribute it and/or modify
6			it under the terms of the GNU General Public License as published by
7			the Free Software Foundation; either version 2 of the License, or
8			(at your option) any later version.
9
10			This program is distributed in the hope that it will be useful,
11			but WITHOUT ANY WARRANTY; without even the implied warranty of
12			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13			GNU General Public License for more details.
14
15			You should have received a copy of the GNU General Public License
16			along with this program; if not, write to the Free Software
17			Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18			*/
19
20			#ifndef VPE_DEVICE_H__
21			#define VPE_DEVICE_H__
22
23	pcg	1.7	#define IFNAMESIZE 256 // be conservative
24	pcg	1.1
25			#include "gettext.h"
26
27			#include "global.h"
28	pcg	1.12	#include "util.h"
29	pcg	1.1
30			struct net_packet {
31			u32 len; // actually u16, but padding...
32
33	pcg	1.4	u8 &operator[] (u16 offset) const;
34	pcg	1.2
35	pcg	1.5	void unshift_hdr (u16 hdrsize)
36			{
37			memmove ((void )&(this)[hdrsize], (void )&(this)[0], len);
38			len += hdrsize;
39			}
40
41	pcg	1.2	void skip_hdr (u16 hdrsize)
42			{
43	pcg	1.5	len -= hdrsize;
44			memmove ((void )&(this)[0], (void )&(this)[hdrsize], len);
45	pcg	1.2	}
46	pcg	1.1
47	pcg	1.4	void set (const net_packet &pkt)
48			{
49			len = pkt.len;
50			memcpy (&((*this)[0]), &(pkt[0]), len);
51			}
52
53	pcg	1.10	bool is_ipv4 () const
54			{
55			return (this)[12] == 0x08 && (this)[13] == 0x00 // IP
56			&& ((*this)[14] & 0xf0) == 0x40; // IPv4
57			}
58
59			u32 &ipv4_src () const
60			{
61			return (u32 )&(*this)[26];
62			}
63
64			u32 &ipv4_dst () const
65			{
66			return (u32 )&(*this)[30];
67			}
68
69			bool is_arp () const
70	pcg	1.1	{
71			return (this)[12] == 0x08 && (this)[13] == 0x06 // 0806 protocol
72			&& (this)[14] == 0x00 && (this)[15] == 0x01 // 0001 hw_format
73			&& (this)[16] == 0x08 && (this)[17] == 0x00 // 0800 prot_format
74			&& (this)[18] == 0x06 && (this)[19] == 0x04; // 06 hw_len 04 prot_len
75			}
76
77			void *operator new (size_t s);
78			void operator delete (void *p);
79			};
80
81			struct data_packet : net_packet {
82			u8 data_[MAXSIZE];
83			};
84
85			inline
86	pcg	1.4	u8 &net_packet::operator[] (u16 offset) const
87	pcg	1.1	{
88			return ((data_packet *)this)->data_[offset];
89			}
90
91			struct tap_packet : net_packet {
92			mac dst;
93			mac src;
94			u8 data[MAXSIZE - 12];
95			};
96
97	pcg	1.9	struct tap_device {
98	pcg	1.1	int fd;
99
100	pcg	1.7	// network interface name or identifier
101	pcg	1.6	char ifrname[IFNAMESIZE + 1];
102	pcg	1.1
103	pcg	1.8	tap_device ();
104			~tap_device ();
105
106			//bool open ();
107			//void close ();
108	pcg	1.1
109			const char *interface () { return ifrname; }
110	pcg	1.6	const char *info ();
111	pcg	1.1
112			tap_packet *recv ();
113			void send (tap_packet *pkt);
114			};
115	pcg	1.7
116	pcg	1.8	//extern tap_device *tap_device ();
117	pcg	1.1
118			#endif
119