140 lines
4.6 KiB
C
140 lines
4.6 KiB
C
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/**
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* @file RouteBuffer.h
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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* Packet buffer for zero-copy packet routing.
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*/
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#ifndef BADVPN_FLOW_ROUTEBUFFER_H
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#define BADVPN_FLOW_ROUTEBUFFER_H
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#include <misc/debug.h>
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#include <structure/LinkedList1.h>
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#include <base/DebugObject.h>
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#include <flow/PacketPassInterface.h>
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struct RouteBuffer_packet {
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LinkedList1Node node;
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int len;
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};
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/**
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* Packet buffer for zero-copy packet routing.
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*
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* Packets are buffered using {@link RouteBufferSource} objects.
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*/
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typedef struct {
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int mtu;
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PacketPassInterface *output;
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LinkedList1 packets_free;
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LinkedList1 packets_used;
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DebugObject d_obj;
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} RouteBuffer;
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/**
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* Object through which packets are buffered into {@link RouteBuffer} objects.
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*
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* A packet is routed by calling {@link RouteBufferSource_Pointer}, writing it to
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* the returned address, then calling {@link RouteBufferSource_Route}.
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*/
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typedef struct {
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int mtu;
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struct RouteBuffer_packet *current_packet;
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DebugObject d_obj;
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} RouteBufferSource;
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/**
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* Initializes the object.
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*
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* @param o the object
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* @param mtu maximum packet size. Must be >=0. It will only be possible to route packets to this buffer
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* from {@link RouteBufferSource}.s with the same MTU.
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* @param output output interface. Its MTU must be >=mtu.
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* @param buf_size size of the buffer in number of packet. Must be >0.
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* @return 1 on success, 0 on failure
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*/
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int RouteBuffer_Init (RouteBuffer *o, int mtu, PacketPassInterface *output, int buf_size) WARN_UNUSED;
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/**
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* Frees the object.
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*/
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void RouteBuffer_Free (RouteBuffer *o);
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/**
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* Retuns the buffer's MTU (mtu argument to {@link RouteBuffer_Init}).
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*
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* @return MTU
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*/
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int RouteBuffer_GetMTU (RouteBuffer *o);
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/**
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* Initializes the object.
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*
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* @param o the object
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* @param mtu maximum packet size. Must be >=0. The object will only be able to route packets
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* to {@link RouteBuffer}'s with the same MTU.
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* @return 1 on success, 0 on failure
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*/
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int RouteBufferSource_Init (RouteBufferSource *o, int mtu) WARN_UNUSED;
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/**
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* Frees the object.
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*
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* @param o the object
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*/
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void RouteBufferSource_Free (RouteBufferSource *o);
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/**
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* Returns a pointer to the current packet.
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* The pointed to memory area will have space for MTU bytes.
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* The pointer is only valid until {@link RouteBufferSource_Route} succeeds.
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*
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* @param o the object
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* @return pointer to the current packet
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*/
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uint8_t * RouteBufferSource_Pointer (RouteBufferSource *o);
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/**
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* Routes the current packet to a given buffer.
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* On success, this invalidates the pointer previously returned from
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* {@link RouteBufferSource_Pointer}.
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*
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* @param o the object
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* @param len length of the packet. Must be >=0 and <=MTU.
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* @param b buffer to route to. Its MTU must equal this object's MTU.
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* @param copy_offset Offset from the beginning for copying. Must be >=0 and
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* <=mtu.
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* @param copy_len Number of bytes to copy from the old current packet to the new one.
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* Must be >=0 and <= mtu - copy_offset.
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* @return 1 on success, 0 on failure
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*/
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int RouteBufferSource_Route (RouteBufferSource *o, int len, RouteBuffer *b, int copy_offset, int copy_len);
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#endif
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