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/*
* ethertap device for MacOSX.
*/
/*
* Copyright (c) 2011 Mattias Nissler <mattias.nissler@gmx.de>
*
* Redistribution and use in source and binary forms, with or without modification, are permitted
* provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other materials provided
* with the distribution.
* 3. The name of the author may not be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __TAP_H__
#define __TAP_H__
#include "tuntap.h"
#define TAP_FAMILY_NAME ((char *) "zt")
#define TAP_IF_COUNT 16 /* max number of tap interfaces */
#define TAP_MTU 2800
#define TAP_LLADDR tap_lladdr
/* the mac address of our interfaces. note that the last byte will be replaced by the unit number */
extern u_char tap_lladdr[];
/* tap manager */
class tap_manager : public tuntap_manager {
protected:
/* just define the interface creation method */
virtual tuntap_interface *create_interface();
};
/* the tap network interface */
class tap_interface : public tuntap_interface {
protected:
/* maximum number of protocols that can be attached */
static const unsigned int MAX_ATTACHED_PROTOS = 8;
/* information about attached protocols for demuxing is stored here */
struct {
/* whether this entry is used */
bool used;
/* type in the ethernet header */
u_int16_t type;
/* protocol passed to add_proto */
protocol_family_t proto;
} attached_protos[MAX_ATTACHED_PROTOS];
/* initializes the interface */
virtual bool initialize(unsigned short major, unsigned short unit);
/* shuts the interface down */
virtual void shutdown();
/* called when the character device is opened in order to intialize the network
* interface.
*/
virtual int initialize_interface();
/* called when the character device is closed to shutdown the network interface */
virtual void shutdown_interface();
/* override interface routines */
virtual errno_t if_ioctl(u_int32_t cmd, void *arg);
virtual errno_t if_demux(mbuf_t m, char *header, protocol_family_t *proto);
virtual errno_t if_framer(mbuf_t *m, const struct sockaddr *dest,
const char *dest_linkaddr, const char *frame_type);
virtual errno_t if_add_proto(protocol_family_t proto,
const struct ifnet_demux_desc *ddesc, u_int32_t ndesc);
virtual errno_t if_del_proto(protocol_family_t proto);
virtual errno_t if_check_multi(const struct sockaddr *maddr);
/* if_add_proto helper */
errno_t add_one_proto(protocol_family_t proto, const struct ifnet_demux_desc &dd);
/* generates a kernel event */
void generate_link_event(u_int32_t code);
friend class tap_manager;
};
#endif /* __TAP_H__ */
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