130 lines
4.1 KiB
C
130 lines
4.1 KiB
C
/**
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* @file PacketRouter.c
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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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#include <flow/PacketRouter.h>
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static void input_handler_done (PacketRouter *o, int data_len)
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{
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ASSERT(data_len >= 0)
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ASSERT(data_len <= o->mtu - o->recv_offset)
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ASSERT(!BPending_IsSet(&o->next_job))
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DebugObject_Access(&o->d_obj);
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// set next job
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BPending_Set(&o->next_job);
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// call handler
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o->handler(o->user, RouteBufferSource_Pointer(&o->rbs), data_len);
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return;
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}
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static void next_job_handler (PacketRouter *o)
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{
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DebugObject_Access(&o->d_obj);
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// receive
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PacketRecvInterface_Receiver_Recv(o->input, RouteBufferSource_Pointer(&o->rbs) + o->recv_offset);
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}
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int PacketRouter_Init (PacketRouter *o, int mtu, int recv_offset, PacketRecvInterface *input, PacketRouter_handler handler, void *user, BPendingGroup *pg)
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{
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ASSERT(mtu >= 0)
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ASSERT(recv_offset >= 0)
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ASSERT(recv_offset <= mtu)
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ASSERT(PacketRecvInterface_GetMTU(input) <= mtu - recv_offset)
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// init arguments
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o->mtu = mtu;
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o->recv_offset = recv_offset;
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o->input = input;
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o->handler = handler;
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o->user = user;
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// init input
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PacketRecvInterface_Receiver_Init(o->input, (PacketRecvInterface_handler_done)input_handler_done, o);
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// init RouteBufferSource
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if (!RouteBufferSource_Init(&o->rbs, mtu)) {
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goto fail0;
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}
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// init next job
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BPending_Init(&o->next_job, pg, (BPending_handler)next_job_handler, o);
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// receive
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PacketRecvInterface_Receiver_Recv(o->input, RouteBufferSource_Pointer(&o->rbs) + o->recv_offset);
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DebugObject_Init(&o->d_obj);
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return 1;
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fail0:
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return 0;
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}
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void PacketRouter_Free (PacketRouter *o)
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{
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DebugObject_Free(&o->d_obj);
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// free next job
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BPending_Free(&o->next_job);
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// free RouteBufferSource
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RouteBufferSource_Free(&o->rbs);
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}
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int PacketRouter_Route (PacketRouter *o, int len, RouteBuffer *output, uint8_t **next_buf, int copy_offset, int copy_len)
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{
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ASSERT(len >= 0)
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ASSERT(len <= o->mtu)
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ASSERT(RouteBuffer_GetMTU(output) == o->mtu)
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ASSERT(copy_offset >= 0)
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ASSERT(copy_offset <= o->mtu)
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ASSERT(copy_len >= 0)
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ASSERT(copy_len <= o->mtu - copy_offset)
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ASSERT(BPending_IsSet(&o->next_job))
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DebugObject_Access(&o->d_obj);
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if (!RouteBufferSource_Route(&o->rbs, len, output, copy_offset, copy_len)) {
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return 0;
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}
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if (next_buf) {
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*next_buf = RouteBufferSource_Pointer(&o->rbs);
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}
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return 1;
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}
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void PacketRouter_AssertRoute (PacketRouter *o)
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{
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ASSERT(BPending_IsSet(&o->next_job))
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DebugObject_Access(&o->d_obj);
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}
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