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/* |
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device.h -- generic header for device.c |
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Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> |
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|
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This file is part of GVPE. |
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|
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GVPE is free software; you can redistribute it and/or modify it |
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under the terms of the GNU General Public License as published by the |
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Free Software Foundation; either version 3 of the License, or (at your |
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option) any later version. |
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|
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This program is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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Public License for more details. |
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|
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You should have received a copy of the GNU General Public License along |
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with this program; if not, see <http://www.gnu.org/licenses/>. |
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|
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Additional permission under GNU GPL version 3 section 7 |
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|
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If you modify this Program, or any covered work, by linking or |
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combining it with the OpenSSL project's OpenSSL library (or a modified |
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version of that library), containing parts covered by the terms of the |
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OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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additional permission to convey the resulting work. Corresponding |
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Source for a non-source form of such a combination shall include the |
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source code for the parts of OpenSSL used as well as that of the |
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covered work. |
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*/ |
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|
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#ifndef GVPE_DEVICE_H__ |
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#define GVPE_DEVICE_H__ |
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|
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#include "config.h" |
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|
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#define IFNAMESIZE 256 // be conservative |
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|
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#include "global.h" |
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#include "util.h" |
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|
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struct net_packet |
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{ |
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u32 len; // actually u16, but padding... |
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|
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u8 &operator[] (u16 offset) const; |
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u8 *at (u16 offset) const; |
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|
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void unshift_hdr (u16 hdrsize) |
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{ |
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memmove ((void *)&(*this)[hdrsize], (void *)&(*this)[0], len); |
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len += hdrsize; |
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} |
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|
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void skip_hdr (u16 hdrsize) |
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{ |
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len -= hdrsize; |
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memmove ((void *)&(*this)[0], (void *)&(*this)[hdrsize], len); |
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} |
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|
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u16 ipv4_hdr_len () const |
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{ |
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return ((*this)[0] & 15) << 2; |
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} |
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|
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void set (const net_packet &pkt) |
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{ |
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len = pkt.len; |
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memcpy (&((*this)[0]), &(pkt[0]), len); |
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} |
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|
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bool is_ipv4 () const |
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{ |
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return (*this)[12] == 0x08 && (*this)[13] == 0x00 // IP |
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&& ((*this)[14] & 0xf0) == 0x40; // IPv4 |
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} |
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|
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u32 &ipv4_src () const |
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{ |
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return *(u32 *)&(*this)[26]; |
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} |
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|
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u32 &ipv4_dst () const |
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{ |
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return *(u32 *)&(*this)[30]; |
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} |
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|
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bool is_arp () const |
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{ |
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return (*this)[12] == 0x08 && (*this)[13] == 0x06 // 0806 protocol |
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&& (*this)[14] == 0x00 && (*this)[15] == 0x01 // 0001 hw_format |
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&& (*this)[16] == 0x08 && (*this)[17] == 0x00 // 0800 prot_format |
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&& (*this)[18] == 0x06 && (*this)[19] == 0x04; // 06 hw_len 04 prot_len |
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} |
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|
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void *operator new (size_t s); |
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void operator delete (void *p); |
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}; |
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|
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struct data_packet : net_packet |
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{ |
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u8 data_[MAXSIZE]; |
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}; |
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|
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inline |
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u8 &net_packet::operator[] (u16 offset) const |
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{ |
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return ((data_packet *)this)->data_[offset]; |
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} |
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|
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inline |
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u8 *net_packet::at (u16 offset) const |
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{ |
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return &((*this)[offset]); |
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} |
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|
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struct tap_packet : net_packet |
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{ |
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mac dst; |
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mac src; |
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u8 data[MAXSIZE - 12]; |
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}; |
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|
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struct tap_device |
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{ |
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int fd; |
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|
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// network interface name or identifier |
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char ifrname[IFNAMESIZE + 1]; |
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|
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char *device; |
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|
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tap_device (); |
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~tap_device (); |
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|
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//bool open (); |
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//void close (); |
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|
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const char *interface () { return ifrname; } |
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const char *info (); |
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const char *if_up (); |
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|
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tap_packet *recv (); |
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void send (tap_packet *pkt); |
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}; |
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|
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//extern tap_device *tap_device (); |
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|
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#endif |
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|
