| 1 |
/* |
| 2 |
device.h -- generic header for device.c |
| 3 |
Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> |
| 4 |
|
| 5 |
This file is part of GVPE. |
| 6 |
|
| 7 |
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 |
*/ |
| 31 |
|
| 32 |
#ifndef GVPE_DEVICE_H__ |
| 33 |
#define GVPE_DEVICE_H__ |
| 34 |
|
| 35 |
#include "config.h" |
| 36 |
|
| 37 |
#define IFNAMESIZE 256 // be conservative |
| 38 |
|
| 39 |
#include "global.h" |
| 40 |
#include "util.h" |
| 41 |
|
| 42 |
struct net_packet |
| 43 |
{ |
| 44 |
u32 len; // actually u16, but padding... |
| 45 |
|
| 46 |
u8 &operator[] (u16 offset) const; |
| 47 |
u8 *at (u16 offset) const; |
| 48 |
|
| 49 |
void unshift_hdr (u16 hdrsize) |
| 50 |
{ |
| 51 |
memmove ((void *)&(*this)[hdrsize], (void *)&(*this)[0], len); |
| 52 |
len += hdrsize; |
| 53 |
} |
| 54 |
|
| 55 |
void skip_hdr (u16 hdrsize) |
| 56 |
{ |
| 57 |
len -= hdrsize; |
| 58 |
memmove ((void *)&(*this)[0], (void *)&(*this)[hdrsize], len); |
| 59 |
} |
| 60 |
|
| 61 |
void set (const net_packet &pkt) |
| 62 |
{ |
| 63 |
len = pkt.len; |
| 64 |
memcpy (&((*this)[0]), &(pkt[0]), len); |
| 65 |
} |
| 66 |
|
| 67 |
bool is_ipv4 () const |
| 68 |
{ |
| 69 |
return (*this)[12] == 0x08 && (*this)[13] == 0x00 // IP |
| 70 |
&& ((*this)[14] & 0xf0) == 0x40; // IPv4 |
| 71 |
} |
| 72 |
|
| 73 |
u32 &ipv4_src () const |
| 74 |
{ |
| 75 |
return *(u32 *)&(*this)[26]; |
| 76 |
} |
| 77 |
|
| 78 |
u32 &ipv4_dst () const |
| 79 |
{ |
| 80 |
return *(u32 *)&(*this)[30]; |
| 81 |
} |
| 82 |
|
| 83 |
bool is_arp () const |
| 84 |
{ |
| 85 |
return (*this)[12] == 0x08 && (*this)[13] == 0x06 // 0806 protocol |
| 86 |
&& (*this)[14] == 0x00 && (*this)[15] == 0x01 // 0001 hw_format |
| 87 |
&& (*this)[16] == 0x08 && (*this)[17] == 0x00 // 0800 prot_format |
| 88 |
&& (*this)[18] == 0x06 && (*this)[19] == 0x04; // 06 hw_len 04 prot_len |
| 89 |
} |
| 90 |
|
| 91 |
void *operator new (size_t s); |
| 92 |
void operator delete (void *p); |
| 93 |
}; |
| 94 |
|
| 95 |
struct data_packet : net_packet |
| 96 |
{ |
| 97 |
u8 data_[MAXSIZE]; |
| 98 |
}; |
| 99 |
|
| 100 |
inline |
| 101 |
u8 &net_packet::operator[] (u16 offset) const |
| 102 |
{ |
| 103 |
return ((data_packet *)this)->data_[offset]; |
| 104 |
} |
| 105 |
|
| 106 |
inline |
| 107 |
u8 *net_packet::at (u16 offset) const |
| 108 |
{ |
| 109 |
return &((*this)[offset]); |
| 110 |
} |
| 111 |
|
| 112 |
struct tap_packet : net_packet |
| 113 |
{ |
| 114 |
mac dst; |
| 115 |
mac src; |
| 116 |
u8 data[MAXSIZE - 12]; |
| 117 |
}; |
| 118 |
|
| 119 |
struct tap_device |
| 120 |
{ |
| 121 |
int fd; |
| 122 |
|
| 123 |
// network interface name or identifier |
| 124 |
char ifrname[IFNAMESIZE + 1]; |
| 125 |
|
| 126 |
char *device; |
| 127 |
|
| 128 |
tap_device (); |
| 129 |
~tap_device (); |
| 130 |
|
| 131 |
//bool open (); |
| 132 |
//void close (); |
| 133 |
|
| 134 |
const char *interface () { return ifrname; } |
| 135 |
const char *info (); |
| 136 |
const char *if_up (); |
| 137 |
|
| 138 |
tap_packet *recv (); |
| 139 |
void send (tap_packet *pkt); |
| 140 |
}; |
| 141 |
|
| 142 |
//extern tap_device *tap_device (); |
| 143 |
|
| 144 |
#endif |
| 145 |
|
