moep80211.h

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/*
 * Copyright 2013, 2014         Maurice Leclaire <leclaire@in.tum.de>
 *                              Stephan M. Guenther <moepi@moepi.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * See COPYING for more details.
 *
 * 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/>.
 */

#ifndef __MOEP80211_MODULES_MOEP80211_H
#define __MOEP80211_MODULES_MOEP80211_H

#include <stddef.h>

#include <moep/dev.h>
#include <moep/frame.h>
#include <moep/moep_hdr_ext.h>
#include <moep/ieee80211_frametypes.h>

#include <moep/modules/radio.h>
#include <moep/modules/unix.h>


/*
 * Since the frame discritiminator consists of the higher 32bit of third address
 * field, we have to choose this value s.t. it does not reflect a valid MAC
 * address. At this thime the best we can do is to chose an OUI and set the
 * locally administered bit to zero (otherwise there is no OUI and it would be
 * possible that we encounter this address by accident).  Since the IANA does
 * not produce many NICs to our knowledge, we use their OUI and make sure by
 * means of the 4th octet, that the address is currently unassigned.
 * See http://www.iana.org/assignments/ethernet-numbers/ethernet-numbers.xml
 */
#define MOEP80211_FRAME_DISCRIMINATOR           0xff5e0000


/*
 * Generic moep80211 header:
 * The structure strictly follows the IEEE802.11 3-address data frame format,
 * except for the third address field that is redefined. The higher 32bit are
 * used to differentiate between IEEE80211 and moep80211 frames. This is done by
 * setting the discriminator field to MOEP80211_FRAME_DISCRIMINATOR. The lower
 * 16bit are used as transmitter-specific sequence number, which is used for
 * channel estimation.
 */
struct moep80211_hdr {
        u16 frame_control;
        u16 duration_id;
        u8 ra[IEEE80211_ALEN];
        u8 ta[IEEE80211_ALEN];
        u32 disc;
        u16 txseq;
        u16 seq_ctrl;
} __attribute__((packed));


void moep_set_moep80211_discriminator(u32 d);

moep_dev_t moep_dev_moep80211_open(const char *devname, u32 freq,
                                   enum moep80211_chan_width chan_width,
                                   u32 freq1, u32 freq2, int mtu);

moep_dev_t moep_dev_moep80211_unix_open(const char *devname, int mtu);

moep_frame_t moep_frame_moep80211_create(void);

moep_frame_t moep_frame_moep80211_unix_create(void);

struct moep80211_hdr *moep_frame_moep80211_hdr(moep_frame_t frame);

#endif /* __MOEP80211_MODULES_MOEP80211_H */