contiki/core/net/rime/ruc.c
2007-03-31 18:33:27 +00:00

160 lines
4.8 KiB
C

/*
* Copyright (c) 2006, Swedish Institute of Computer Science.
* All rights reserved.
*
* 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 Institute 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 INSTITUTE 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 INSTITUTE OR CONTRIBUTORS 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.
*
* This file is part of the Contiki operating system.
*
* $Id: ruc.c,v 1.9 2007/03/31 18:33:27 adamdunkels Exp $
*/
/**
* \file
* Reliable unicast
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "net/rime/ruc.h"
#include "net/rime/neighbor.h"
#include "net/rime.h"
#include <string.h>
#define TYPE_DATA 0
#define TYPE_ACK 1
struct ruc_hdr {
u8_t type;
u8_t seqno;
};
enum {
STATE_READY,
STATE_SENDING
};
static u8_t seqno;
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static void
sent_by_suc(struct suc_conn *suc)
{
struct ruc_conn *c = (struct ruc_conn *)suc;
c->transmissions_left--;
if(c->transmissions_left == 0) {
suc_cancel(&c->c);
}
}
/*---------------------------------------------------------------------------*/
static void
recv_from_suc(struct suc_conn *suc, rimeaddr_t *from)
{
struct ruc_conn *c = (struct ruc_conn *)suc;
struct ruc_hdr *hdr = rimebuf_dataptr();
PRINTF("%d.%d: ruc: recv_from_suc from %d.%d type %d seqno %d\n",
rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
from->u8[0], from->u8[1],
hdr->type, hdr->seqno);
if(hdr->type == TYPE_ACK) {
if(hdr->seqno == seqno) {
PRINTF("%d.%d: ruc: ACKed %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
hdr->seqno);
++seqno;
suc_cancel(&c->c);
if(c->u->sent != NULL) {
c->u->sent(c);
}
}
} else if(hdr->type == TYPE_DATA) {
int send_ack = 1;
u16_t packet_seqno;
packet_seqno = hdr->seqno;
rimebuf_hdrreduce(sizeof(struct ruc_hdr));
if(c->u->recv != NULL) {
send_ack = c->u->recv(c, from, packet_seqno);
}
if(send_ack) {
PRINTF("%d.%d: ruc: Sending ACK to %d.%d for %d\n",
rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
from->u8[0], from->u8[1],
packet_seqno);
rimebuf_clear();
rimebuf_hdralloc(sizeof(struct ruc_hdr));
hdr = rimebuf_hdrptr();
hdr->type = TYPE_ACK;
hdr->seqno = packet_seqno;
suc_send(&c->c, from);
} else {
PRINTF("%d.%d: Not sending ACK\n",
rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1]);
}
}
}
/*---------------------------------------------------------------------------*/
static const struct suc_callbacks ruc = {recv_from_suc, sent_by_suc};
/*---------------------------------------------------------------------------*/
void
ruc_open(struct ruc_conn *c, u16_t channel,
const struct ruc_callbacks *u)
{
suc_open(&c->c, channel, &ruc);
c->u = u;
}
/*---------------------------------------------------------------------------*/
void
ruc_close(struct ruc_conn *c)
{
suc_close(&c->c);
}
/*---------------------------------------------------------------------------*/
int
ruc_send(struct ruc_conn *c, rimeaddr_t *receiver, u8_t max_retransmissions)
{
if(rimebuf_hdralloc(sizeof(struct ruc_hdr))) {
struct ruc_hdr *hdr = rimebuf_hdrptr();
hdr->type = TYPE_DATA;
hdr->seqno = seqno;
c->transmissions_left = max_retransmissions;
return suc_send_stubborn(&c->c, receiver);
}
return 0;
}
/*---------------------------------------------------------------------------*/