160 lines
4.8 KiB
C
160 lines
4.8 KiB
C
/*
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* Copyright (c) 2006, Swedish Institute of Computer Science.
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* All rights reserved.
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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
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* 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 Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: ruc.c,v 1.9 2007/03/31 18:33:27 adamdunkels Exp $
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*/
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/**
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* \file
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* Reliable unicast
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include "net/rime/ruc.h"
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#include "net/rime/neighbor.h"
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#include "net/rime.h"
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#include <string.h>
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#define TYPE_DATA 0
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#define TYPE_ACK 1
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struct ruc_hdr {
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u8_t type;
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u8_t seqno;
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};
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enum {
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STATE_READY,
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STATE_SENDING
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};
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static u8_t seqno;
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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/*---------------------------------------------------------------------------*/
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static void
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sent_by_suc(struct suc_conn *suc)
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{
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struct ruc_conn *c = (struct ruc_conn *)suc;
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c->transmissions_left--;
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if(c->transmissions_left == 0) {
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suc_cancel(&c->c);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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recv_from_suc(struct suc_conn *suc, rimeaddr_t *from)
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{
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struct ruc_conn *c = (struct ruc_conn *)suc;
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struct ruc_hdr *hdr = rimebuf_dataptr();
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PRINTF("%d.%d: ruc: recv_from_suc from %d.%d type %d seqno %d\n",
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rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
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from->u8[0], from->u8[1],
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hdr->type, hdr->seqno);
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if(hdr->type == TYPE_ACK) {
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if(hdr->seqno == seqno) {
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PRINTF("%d.%d: ruc: ACKed %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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hdr->seqno);
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++seqno;
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suc_cancel(&c->c);
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if(c->u->sent != NULL) {
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c->u->sent(c);
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}
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}
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} else if(hdr->type == TYPE_DATA) {
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int send_ack = 1;
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u16_t packet_seqno;
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packet_seqno = hdr->seqno;
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rimebuf_hdrreduce(sizeof(struct ruc_hdr));
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if(c->u->recv != NULL) {
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send_ack = c->u->recv(c, from, packet_seqno);
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}
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if(send_ack) {
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PRINTF("%d.%d: ruc: Sending ACK to %d.%d for %d\n",
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rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
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from->u8[0], from->u8[1],
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packet_seqno);
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rimebuf_clear();
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rimebuf_hdralloc(sizeof(struct ruc_hdr));
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hdr = rimebuf_hdrptr();
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hdr->type = TYPE_ACK;
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hdr->seqno = packet_seqno;
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suc_send(&c->c, from);
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} else {
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PRINTF("%d.%d: Not sending ACK\n",
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rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1]);
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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static const struct suc_callbacks ruc = {recv_from_suc, sent_by_suc};
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/*---------------------------------------------------------------------------*/
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void
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ruc_open(struct ruc_conn *c, u16_t channel,
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const struct ruc_callbacks *u)
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{
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suc_open(&c->c, channel, &ruc);
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c->u = u;
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}
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/*---------------------------------------------------------------------------*/
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void
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ruc_close(struct ruc_conn *c)
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{
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suc_close(&c->c);
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}
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/*---------------------------------------------------------------------------*/
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int
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ruc_send(struct ruc_conn *c, rimeaddr_t *receiver, u8_t max_retransmissions)
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{
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if(rimebuf_hdralloc(sizeof(struct ruc_hdr))) {
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struct ruc_hdr *hdr = rimebuf_hdrptr();
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hdr->type = TYPE_DATA;
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hdr->seqno = seqno;
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c->transmissions_left = max_retransmissions;
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return suc_send_stubborn(&c->c, receiver);
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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