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Comparing gvpe/src/device.h (file contents):
Revision 1.5 by pcg, Tue Apr 8 02:00:54 2003 UTC vs.
Revision 1.26 by root, Wed Jul 17 16:40:57 2013 UTC

1/* 1/*
2 device.h -- generic header for device.c 2 device.h -- generic header for device.c
3 Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
3 4
5 This file is part of GVPE.
6
4 This program is free software; you can redistribute it and/or modify 7 GVPE is free software; you can redistribute it and/or modify it
5 it under the terms of the GNU General Public License as published by 8 under the terms of the GNU General Public License as published by the
6 the Free Software Foundation; either version 2 of the License, or 9 Free Software Foundation; either version 3 of the License, or (at your
7 (at your option) any later version. 10 option) any later version.
8 11
9 This program is distributed in the hope that it will be useful, 12 This program is distributed in the hope that it will be useful, but
10 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12 GNU General Public License for more details. 15 Public License for more details.
13 16
14 You should have received a copy of the GNU General Public License 17 You should have received a copy of the GNU General Public License along
15 along with this program; if not, write to the Free Software 18 with this program; if not, see <http://www.gnu.org/licenses/>.
16 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 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.
17*/ 30*/
18 31
19#ifndef VPE_DEVICE_H__ 32#ifndef GVPE_DEVICE_H__
20#define VPE_DEVICE_H__ 33#define GVPE_DEVICE_H__
21 34
22#include <net/if.h> 35#include "config.h"
23 36
24#include "gettext.h" 37#define IFNAMESIZE 256 // be conservative
25 38
26#include "global.h" 39#include "global.h"
40#include "util.h"
27 41
28struct net_packet { 42struct net_packet
43{
29 u32 len; // actually u16, but padding... 44 u32 len; // actually u16, but padding...
45 // 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.
30 48
31 u8 &operator[] (u16 offset) const; 49 u8 &operator[] (u16 offset) const;
50 u8 *at (u16 offset) const;
32 51
33 void unshift_hdr (u16 hdrsize) 52 void unshift_hdr (u16 hdrsize)
34 { 53 {
35 memmove ((void *)&(*this)[hdrsize], (void *)&(*this)[0], len); 54 memmove ((void *)&(*this)[hdrsize], (void *)&(*this)[0], len);
36 len += hdrsize; 55 len += hdrsize;
… …
40 { 59 {
41 len -= hdrsize; 60 len -= hdrsize;
42 memmove ((void *)&(*this)[0], (void *)&(*this)[hdrsize], len); 61 memmove ((void *)&(*this)[0], (void *)&(*this)[hdrsize], len);
43 } 62 }
44 63
64 u16 ipv4_hdr_len () const
65 {
66 return ((*this)[0] & 15) << 2;
67 }
68
45 void set (const net_packet &pkt) 69 void set (const net_packet &pkt)
46 { 70 {
47 len = pkt.len; 71 len = pkt.len;
48 memcpy (&((*this)[0]), &(pkt[0]), len); 72 memcpy (&((*this)[0]), &(pkt[0]), len);
49 } 73 }
50 74
75 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
51 bool is_arp () 91 bool is_arp () const
52 { 92 {
53 return (*this)[12] == 0x08 && (*this)[13] == 0x06 // 0806 protocol 93 return (*this)[12] == 0x08 && (*this)[13] == 0x06 // 0806 protocol
54 && (*this)[14] == 0x00 && (*this)[15] == 0x01 // 0001 hw_format 94 && (*this)[14] == 0x00 && (*this)[15] == 0x01 // 0001 hw_format
55 && (*this)[16] == 0x08 && (*this)[17] == 0x00 // 0800 prot_format 95 && (*this)[16] == 0x08 && (*this)[17] == 0x00 // 0800 prot_format
56 && (*this)[18] == 0x06 && (*this)[19] == 0x04; // 06 hw_len 04 prot_len 96 && (*this)[18] == 0x06 && (*this)[19] == 0x04; // 06 hw_len 04 prot_len
… …
58 98
59 void *operator new (size_t s); 99 void *operator new (size_t s);
60 void operator delete (void *p); 100 void operator delete (void *p);
61}; 101};
62 102
63struct data_packet : net_packet { 103struct data_packet : net_packet
104{
64 u8 data_[MAXSIZE]; 105 u8 data_[MAXSIZE];
65}; 106};
66 107
67inline 108inline
68u8 &net_packet::operator[] (u16 offset) const 109u8 &net_packet::operator[] (u16 offset) const
69{ 110{
70 return ((data_packet *)this)->data_[offset]; 111 return ((data_packet *)this)->data_[offset];
71} 112}
72 113
73typedef u8 mac[6]; 114inline
115u8 *net_packet::at (u16 offset) const
116{
117 return &((*this)[offset]);
118}
74 119
75struct tap_packet : net_packet { 120struct tap_packet : net_packet
121{
76 mac dst; 122 mac dst;
77 mac src; 123 mac src;
78 u8 data[MAXSIZE - 12]; 124 u8 data[MAXSIZE - 12];
79}; 125};
80 126
81struct tap_device { 127struct tap_device
128{
82 int fd; 129 int fd;
83 130
84 // linux tuntap 131 // network interface name or identifier
85 char ifrname[IFNAMSIZ + 1]; 132 char ifrname[IFNAMESIZE + 1];
86 133
87 char *device; 134 char *device;
88 135
89 tap_device (); 136 tap_device ();
90 ~tap_device (); 137 ~tap_device ();
91 138
139 //bool open ();
140 //void close ();
141
92 const char *interface () { return ifrname; } 142 const char *interface () { return ifrname; }
93 const char *info () { return _("Linux tun/tap device"); } 143 const char *info ();
144 const char *if_up ();
94 145
95 tap_packet *recv (); 146 tap_packet *recv ();
96 void send (tap_packet *pkt); 147 void send (tap_packet *pkt);
97}; 148};
98 149
150//extern tap_device *tap_device ();
151
99#endif 152#endif
100 153

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