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Hop-by-hop reliable multi-hop communication primitive (untested)

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adamdunkels 2007-05-22 20:45:18 +00:00
parent fdded2f77f
commit 0206e1cd3b
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156
core/net/rime/rmh.c Normal file
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/**
* \addtogroup rimermh
* @{
*/
/*
* Copyright (c) 2007, 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: rmh.c,v 1.1 2007/05/22 20:45:18 adamdunkels Exp $
*/
/**
* \file
* Multihop forwarding
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "contiki.h"
#include "net/rime.h"
#include "net/rime/rmh.h"
struct data_hdr {
rimeaddr_t dest;
rimeaddr_t originator;
u8_t hops;
u8_t max_rexmits;
};
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static int
received(struct ruc_conn *uc, rimeaddr_t *from, u8_t seqno)
{
struct rmh_conn *c = (struct rmh_conn *)uc;
struct data_hdr *msg = rimebuf_dataptr();
rimeaddr_t *nexthop;
PRINTF("data_packet_received from %d towards %d len %d\n", from->u16[0],
msg->dest.u16[0],
rimebuf_datalen());
if(rimeaddr_cmp(&msg->dest, &rimeaddr_node_addr)) {
PRINTF("for us!\n");
rimebuf_hdrreduce(sizeof(struct data_hdr));
if(c->cb->recv) {
c->cb->recv(c, &msg->originator);
}
} else {
nexthop = NULL;
if(c->cb->forward) {
nexthop = c->cb->forward(c, &msg->originator,
&msg->dest, from, msg->hops);
}
if(nexthop) {
PRINTF("forwarding to %d\n", rt->nexthop.u16[0]);
msg->hops++;
ruc_send(&c->c, nexthop, c->num_rexmit);
}
}
return 1;
}
/*---------------------------------------------------------------------------*/
static void
sent(struct ruc_conn *c)
{
}
/*---------------------------------------------------------------------------*/
static void
timedout(struct ruc_conn *c)
{
}
/*---------------------------------------------------------------------------*/
static const struct ruc_callbacks data_callbacks = { received ,
sent,
timedout};
/*---------------------------------------------------------------------------*/
void
rmh_open(struct rmh_conn *c, u16_t channel,
const struct rmh_callbacks *callbacks)
{
ruc_open(&c->c, channel, &data_callbacks);
c->cb = callbacks;
}
/*---------------------------------------------------------------------------*/
void
rmh_close(struct rmh_conn *c)
{
ruc_close(&c->c);
}
/*---------------------------------------------------------------------------*/
int
rmh_send(struct rmh_conn *c, rimeaddr_t *to, u8_t num_rexmit, u8_t max_hops)
{
rimeaddr_t *nexthop;
struct data_hdr *hdr;
c->num_rexmit = num_rexmit;
nexthop = c->cb->forward(c, &rimeaddr_node_addr, to, NULL, 0);
if(nexthop == NULL) {
PRINTF("rmh_send: no route\n");
return 0;
} else {
PRINTF("rmh_send: sending data\n");
if(rimebuf_hdralloc(sizeof(struct data_hdr))) {
hdr = rimebuf_hdrptr();
rimeaddr_copy(&hdr->dest, to);
rimeaddr_copy(&hdr->originator, &rimeaddr_node_addr);
hdr->hops = 0;
hdr->max_rexmits = num_rexmit;
ruc_send(&c->c, nexthop, num_rexmit);
}
return 1;
}
}
/*---------------------------------------------------------------------------*/
/** @} */

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core/net/rime/rmh.h Normal file
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/**
* \addtogroup rime
* @{
*/
/**
* \defgroup rimermh Best-effort multihop forwarding
* @{
*
* The rmh module implements a multihop forwarding mechanism. Routes
* must have already been setup with the route_add() function. Setting
* up routes is done with another Rime module such as the \ref
* routediscovery "route-discovery module".
*
* \section channels Channels
*
* The rmh module uses 1 channel.
*
*/
/*
* 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: rmh.h,v 1.1 2007/05/22 20:45:18 adamdunkels Exp $
*/
/**
* \file
* Multihop forwarding header file
* \author
* Adam Dunkels <adam@sics.se>
*/
#ifndef __RMH_H__
#define __RMH_H__
#include "net/rime/abc.h"
#include "net/rime/rimeaddr.h"
struct rmh_conn;
struct rmh_callbacks {
void (* recv)(struct rmh_conn *ptr, rimeaddr_t *sender);
rimeaddr_t *(* forward)(struct rmh_conn *ptr,
rimeaddr_t *originator,
rimeaddr_t *dest,
rimeaddr_t *prevhop,
u8_t hops);
};
struct rmh_conn {
struct ruc_conn c;
const struct rmh_callbacks *cb;
u8_t num_rexmit;
};
void rmh_open(struct rmh_conn *c, u16_t channel,
const struct rmh_callbacks *u);
void rmh_close(struct rmh_conn *c);
int rmh_send(struct rmh_conn *c, rimeaddr_t *to, u8_t num_rexmit,
u8_t max_hops);
#endif /* __RMH_H__ */
/** @} */
/** @} */