gvpe/src/device.h

/*
    device.h -- generic header for device.c
    Copyright (C) 2003-2008 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 3 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, see <http://www.gnu.org/licenses/>.
   
    Additional permission under GNU GPL version 3 section 7
   
    If you modify this Program, or any covered work, by linking or
    combining it with the OpenSSL project's OpenSSL library (or a modified
    version of that library), containing parts covered by the terms of the
    OpenSSL or SSLeay licenses, the licensors of this Program grant you
    additional permission to convey the resulting work.  Corresponding
    Source for a non-source form of such a combination shall include the
    source code for the parts of OpenSSL used as well as that of the
    covered work.
*/

#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...
  // upto 4 bytes at the end might get overwritten when decrypting,
  // which means len, above, is regularly overwritten with part
  // of the random prefix when RAND_BYTES=12.

  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);
    }

  u16 ipv4_hdr_len () const
    {
      return ((*this)[0] & 15) << 2;
    }

  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:	1.26
Committed:	Wed Jul 17 16:40:57 2013 UTC (10 years, 10 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.25:	+3 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			device.h -- generic header for device.c
3	pcg	1.22	Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
4	pcg	1.1
5	pcg	1.17	This file is part of GVPE.
6
7	pcg	1.22	GVPE is free software; you can redistribute it and/or modify it
8			under the terms of the GNU General Public License as published by the
9			Free Software Foundation; either version 3 of the License, or (at your
10			option) any later version.
11
12			This program is distributed in the hope that it will be useful, but
13			WITHOUT ANY WARRANTY; without even the implied warranty of
14			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15			Public License for more details.
16
17			You should have received a copy of the GNU General Public License along
18			with this program; if not, see <http://www.gnu.org/licenses/>.
19
20			Additional permission under GNU GPL version 3 section 7
21
22			If you modify this Program, or any covered work, by linking or
23			combining it with the OpenSSL project's OpenSSL library (or a modified
24			version of that library), containing parts covered by the terms of the
25			OpenSSL or SSLeay licenses, the licensors of this Program grant you
26			additional permission to convey the resulting work. Corresponding
27			Source for a non-source form of such a combination shall include the
28			source code for the parts of OpenSSL used as well as that of the
29			covered work.
30	pcg	1.1	*/
31
32	pcg	1.18	#ifndef GVPE_DEVICE_H__
33			#define GVPE_DEVICE_H__
34
35			#include "config.h"
36	pcg	1.1
37	pcg	1.7	#define IFNAMESIZE 256 // be conservative
38	pcg	1.1
39			#include "global.h"
40	pcg	1.12	#include "util.h"
41	pcg	1.1
42	pcg	1.21	struct net_packet
43			{
44	pcg	1.1	u32 len; // actually u16, but padding...
45	root	1.26	// upto 4 bytes at the end might get overwritten when decrypting,
46			// which means len, above, is regularly overwritten with part
47			// of the random prefix when RAND_BYTES=12.
48	pcg	1.1
49	pcg	1.4	u8 &operator[] (u16 offset) const;
50	pcg	1.16	u8 *at (u16 offset) const;
51	pcg	1.2
52	pcg	1.5	void unshift_hdr (u16 hdrsize)
53			{
54			memmove ((void )&(this)[hdrsize], (void )&(this)[0], len);
55			len += hdrsize;
56			}
57
58	pcg	1.2	void skip_hdr (u16 hdrsize)
59			{
60	pcg	1.5	len -= hdrsize;
61			memmove ((void )&(this)[0], (void )&(this)[hdrsize], len);
62	pcg	1.2	}
63	pcg	1.1
64	root	1.25	u16 ipv4_hdr_len () const
65	root	1.24	{
66	root	1.25	return ((*this)[0] & 15) << 2;
67	root	1.24	}
68
69	pcg	1.4	void set (const net_packet &pkt)
70			{
71			len = pkt.len;
72			memcpy (&((*this)[0]), &(pkt[0]), len);
73			}
74
75	pcg	1.10	bool is_ipv4 () const
76			{
77			return (this)[12] == 0x08 && (this)[13] == 0x00 // IP
78			&& ((*this)[14] & 0xf0) == 0x40; // IPv4
79			}
80
81			u32 &ipv4_src () const
82			{
83			return (u32 )&(*this)[26];
84			}
85
86			u32 &ipv4_dst () const
87			{
88			return (u32 )&(*this)[30];
89			}
90
91			bool is_arp () const
92	pcg	1.1	{
93			return (this)[12] == 0x08 && (this)[13] == 0x06 // 0806 protocol
94			&& (this)[14] == 0x00 && (this)[15] == 0x01 // 0001 hw_format
95			&& (this)[16] == 0x08 && (this)[17] == 0x00 // 0800 prot_format
96			&& (this)[18] == 0x06 && (this)[19] == 0x04; // 06 hw_len 04 prot_len
97			}
98
99			void *operator new (size_t s);
100			void operator delete (void *p);
101			};
102
103	pcg	1.21	struct data_packet : net_packet
104			{
105	pcg	1.1	u8 data_[MAXSIZE];
106			};
107
108	root	1.23	inline
109	pcg	1.4	u8 &net_packet::operator[] (u16 offset) const
110	pcg	1.1	{
111			return ((data_packet *)this)->data_[offset];
112			}
113
114	root	1.23	inline
115	pcg	1.16	u8 *net_packet::at (u16 offset) const
116			{
117			return &((*this)[offset]);
118			}
119
120	pcg	1.21	struct tap_packet : net_packet
121			{
122	pcg	1.1	mac dst;
123			mac src;
124			u8 data[MAXSIZE - 12];
125			};
126
127	pcg	1.21	struct tap_device
128			{
129	pcg	1.1	int fd;
130
131	pcg	1.7	// network interface name or identifier
132	pcg	1.6	char ifrname[IFNAMESIZE + 1];
133	pcg	1.1
134	pcg	1.14	char *device;
135
136	pcg	1.8	tap_device ();
137			~tap_device ();
138
139			//bool open ();
140			//void close ();
141	pcg	1.1
142			const char *interface () { return ifrname; }
143	pcg	1.6	const char *info ();
144	pcg	1.19	const char *if_up ();
145	pcg	1.1
146			tap_packet *recv ();
147			void send (tap_packet *pkt);
148			};
149	pcg	1.7
150	pcg	1.8	//extern tap_device *tap_device ();
151	pcg	1.1
152			#endif
153