100 lines
3.5 KiB
C
100 lines
3.5 KiB
C
|
/**
|
||
|
|
* @file PacketPassNotifier.h
|
||
|
|
* @author Ambroz Bizjak <ambrop7@gmail.com>
|
||
|
|
*
|
||
|
|
* @section LICENSE
|
||
|
|
*
|
||
|
|
* 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. Neither the name of the author nor the
|
||
|
|
* names of its contributors may be used to endorse or promote products
|
||
|
|
* derived from this software without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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.
|
||
|
|
*
|
||
|
|
* @section DESCRIPTION
|
||
|
|
*
|
||
|
|
* A {@link PacketPassInterface} layer which calles a handler function before
|
||
|
|
* passing a packet from input to output.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef BADVPN_FLOW_PACKETPASSNOTIFIER_H
|
||
|
|
#define BADVPN_FLOW_PACKETPASSNOTIFIER_H
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
#include <base/DebugObject.h>
|
||
|
|
#include <flow/PacketPassInterface.h>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Handler function called when input calls Send, but before the call is passed on to output.
|
||
|
|
*
|
||
|
|
* @param user value specified in {@link PacketPassNotifier_SetHandler}
|
||
|
|
* @param data packet provided by input
|
||
|
|
* @param data_len size of the packet
|
||
|
|
*/
|
||
|
|
typedef void (*PacketPassNotifier_handler_notify) (void *user, uint8_t *data, int data_len);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* A {@link PacketPassInterface} layer which calles a handler function before
|
||
|
|
* passing a packet from input to output.
|
||
|
|
*/
|
||
|
|
typedef struct {
|
||
|
|
PacketPassInterface input;
|
||
|
|
PacketPassInterface *output;
|
||
|
|
PacketPassNotifier_handler_notify handler;
|
||
|
|
void *handler_user;
|
||
|
|
DebugObject d_obj;
|
||
|
|
} PacketPassNotifier;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Initializes the object.
|
||
|
|
*
|
||
|
|
* @param o the object
|
||
|
|
* @param output output interface
|
||
|
|
* @param pg pending group
|
||
|
|
*/
|
||
|
|
void PacketPassNotifier_Init (PacketPassNotifier *o, PacketPassInterface *output, BPendingGroup *pg);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Frees the object.
|
||
|
|
*
|
||
|
|
* @param o the object
|
||
|
|
*/
|
||
|
|
void PacketPassNotifier_Free (PacketPassNotifier *o);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the input interface.
|
||
|
|
* The MTU of the interface will be the same as of the output interface.
|
||
|
|
* The interface supports cancel functionality if the output interface supports it.
|
||
|
|
*
|
||
|
|
* @param o the object
|
||
|
|
* @return input interface
|
||
|
|
*/
|
||
|
|
PacketPassInterface * PacketPassNotifier_GetInput (PacketPassNotifier *o);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Configures a handler function to call before passing input packets to output.
|
||
|
|
*
|
||
|
|
* @param o the object
|
||
|
|
* @param handler handler function, or NULL to disable.
|
||
|
|
* @param user value to pass to handler function. Ignored if handler is NULL.
|
||
|
|
*/
|
||
|
|
void PacketPassNotifier_SetHandler (PacketPassNotifier *o, PacketPassNotifier_handler_notify handler, void *user);
|
||
|
|
|
||
|
|
#endif
|