gvpe/src/device.h

/*
    device.h -- generic header for device.c
 
    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"

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];
}

typedef u8 mac[6];

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:	1.10
Committed:	Thu Oct 16 02:28:36 2003 UTC (20 years, 7 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.9:	+17 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			device.h -- generic header for device.c
3
4			This program is free software; you can redistribute it and/or modify
5			it under the terms of the GNU General Public License as published by
6			the Free Software Foundation; either version 2 of the License, or
7			(at your option) any later version.
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
19			#ifndef VPE_DEVICE_H__
20			#define VPE_DEVICE_H__
21
22	pcg	1.7	#define IFNAMESIZE 256 // be conservative
23	pcg	1.1
24			#include "gettext.h"
25
26			#include "global.h"
27
28			struct net_packet {
29			u32 len; // actually u16, but padding...
30
31	pcg	1.4	u8 &operator[] (u16 offset) const;
32	pcg	1.2
33	pcg	1.5	void unshift_hdr (u16 hdrsize)
34			{
35			memmove ((void )&(this)[hdrsize], (void )&(this)[0], len);
36			len += hdrsize;
37			}
38
39	pcg	1.2	void skip_hdr (u16 hdrsize)
40			{
41	pcg	1.5	len -= hdrsize;
42			memmove ((void )&(this)[0], (void )&(this)[hdrsize], len);
43	pcg	1.2	}
44	pcg	1.1
45	pcg	1.4	void set (const net_packet &pkt)
46			{
47			len = pkt.len;
48			memcpy (&((*this)[0]), &(pkt[0]), len);
49			}
50
51	pcg	1.10	bool is_ipv4 () const
52			{
53			return (this)[12] == 0x08 && (this)[13] == 0x00 // IP
54			&& ((*this)[14] & 0xf0) == 0x40; // IPv4
55			}
56
57			u32 &ipv4_src () const
58			{
59			return (u32 )&(*this)[26];
60			}
61
62			u32 &ipv4_dst () const
63			{
64			return (u32 )&(*this)[30];
65			}
66
67			bool is_arp () const
68	pcg	1.1	{
69			return (this)[12] == 0x08 && (this)[13] == 0x06 // 0806 protocol
70			&& (this)[14] == 0x00 && (this)[15] == 0x01 // 0001 hw_format
71			&& (this)[16] == 0x08 && (this)[17] == 0x00 // 0800 prot_format
72			&& (this)[18] == 0x06 && (this)[19] == 0x04; // 06 hw_len 04 prot_len
73			}
74
75			void *operator new (size_t s);
76			void operator delete (void *p);
77			};
78
79			struct data_packet : net_packet {
80			u8 data_[MAXSIZE];
81			};
82
83			inline
84	pcg	1.4	u8 &net_packet::operator[] (u16 offset) const
85	pcg	1.1	{
86			return ((data_packet *)this)->data_[offset];
87			}
88
89			typedef u8 mac[6];
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			char *device;
104
105	pcg	1.8	tap_device ();
106			~tap_device ();
107
108			//bool open ();
109			//void close ();
110	pcg	1.1
111			const char *interface () { return ifrname; }
112	pcg	1.6	const char *info ();
113	pcg	1.1
114			tap_packet *recv ();
115			void send (tap_packet *pkt);
116			};
117	pcg	1.7
118	pcg	1.8	//extern tap_device *tap_device ();
119	pcg	1.1
120			#endif
121