contiki/core/net/rime/ruc.c
2008-01-14 09:34:33 +00:00

205 lines
5.9 KiB
C

/**
* \addtogroup rimeruc
* @{
*/
/*
* 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 1.17 2008/01/14 09:34:33 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 REXMIT_TIME CLOCK_SECOND
#define TYPE_DATA 0
#define TYPE_ACK 1
struct ruc_hdr {
u8_t type;
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;
if(c->rxmit != 0) {
RIMESTATS_ADD(rexmit);
PRINTF("%d.%d: ruc: packet %u resent %u\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
((struct ruc_hdr *) rimebuf_dataptr())->seqno, c->rxmit);
}
c->rxmit++;
if(c->rxmit >= c->max_rxmit) {
RIMESTATS_ADD(timedout);
suc_cancel(&c->c);
if(c->u->timedout) {
c->u->timedout(c, suc_receiver(&c->c), c->rxmit);
}
PRINTF("%d.%d: ruc: packet %d timed out\n",
rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
c->sndnxt);
} else {
int shift;
shift = c->rxmit > 4? 4: c->rxmit;
suc_set_timer(&c->c, (REXMIT_TIME) << shift);
}
}
/*---------------------------------------------------------------------------*/
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 == c->sndnxt) {
RIMESTATS_ADD(ackrx);
PRINTF("%d.%d: ruc: ACKed %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
hdr->seqno);
++c->sndnxt;
suc_cancel(&c->c);
if(c->u->sent != NULL) {
c->u->sent(c, suc_receiver(&c->c), c->rxmit);
}
} else {
PRINTF("%d.%d: ruc: received bad ACK %d for %d\n",
rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
hdr->seqno,
c->sndnxt);
RIMESTATS_ADD(badackrx);
}
} else if(hdr->type == TYPE_DATA) {
/* int send_ack = 1;*/
u16_t packet_seqno;
struct queuebuf *q;
RIMESTATS_ADD(reliablerx);
PRINTF("%d.%d: ruc: got packet %d\n",
rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
hdr->seqno);
packet_seqno = hdr->seqno;
rimebuf_hdrreduce(sizeof(struct ruc_hdr));
q = queuebuf_new_from_rimebuf();
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);
RIMESTATS_ADD(acktx);
queuebuf_to_rimebuf(q);
queuebuf_free(q);
if(c->u->recv != NULL) {
c->u->recv(c, from, packet_seqno);
}
}
}
/*---------------------------------------------------------------------------*/
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;
c->rxmit = 0;
c->sndnxt = 0;
}
/*---------------------------------------------------------------------------*/
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 = c->sndnxt;
c->max_rxmit = max_retransmissions;
c->rxmit = 0;
RIMESTATS_ADD(reliabletx);
PRINTF("%d.%d: ruc: sending packet %d\n",
rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
c->sndnxt);
return suc_send_stubborn(&c->c, receiver, REXMIT_TIME);
}
return 0;
}
/*---------------------------------------------------------------------------*/
/** @} */