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143 lines
4.3 KiB
C
143 lines
4.3 KiB
C
/**
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* \addtogroup rimemh
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* @{
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*/
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/*
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* Copyright (c) 2007, 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: mh.c,v 1.7 2008/01/08 07:55:56 adamdunkels Exp $
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*/
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/**
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* \file
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* Multihop forwarding
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include "contiki.h"
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#include "net/rime.h"
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#include "net/rime/mh.h"
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#include "net/rime/route.h"
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struct data_hdr {
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rimeaddr_t dest;
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rimeaddr_t originator;
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u8_t hops;
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u8_t pad;
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};
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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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void
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data_packet_received(struct uc_conn *uc, rimeaddr_t *from)
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{
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struct mh_conn *c = (struct mh_conn *)uc;
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struct data_hdr *msg = rimebuf_dataptr();
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rimeaddr_t *nexthop;
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PRINTF("data_packet_received from %d towards %d len %d\n", from->u16[0],
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msg->dest.u16[0],
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rimebuf_datalen());
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if(rimeaddr_cmp(&msg->dest, &rimeaddr_node_addr)) {
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PRINTF("for us!\n");
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rimebuf_hdrreduce(sizeof(struct data_hdr));
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if(c->cb->recv) {
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c->cb->recv(c, &msg->originator, msg->hops);
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}
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} else {
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nexthop = NULL;
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if(c->cb->forward) {
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nexthop = c->cb->forward(c, &msg->originator,
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&msg->dest, from, msg->hops);
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}
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if(nexthop) {
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PRINTF("forwarding to %d.%d\n", nexthop->u8[0], nexthop->u8[1]);
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msg->hops++;
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uc_send(&c->c, nexthop);
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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static const struct uc_callbacks data_callbacks = { data_packet_received };
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/*---------------------------------------------------------------------------*/
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void
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mh_open(struct mh_conn *c, u16_t channel,
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const struct mh_callbacks *callbacks)
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{
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uc_open(&c->c, channel, &data_callbacks);
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c->cb = callbacks;
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}
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/*---------------------------------------------------------------------------*/
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void
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mh_close(struct mh_conn *c)
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{
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uc_close(&c->c);
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}
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/*---------------------------------------------------------------------------*/
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int
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mh_send(struct mh_conn *c, rimeaddr_t *to)
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{
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rimeaddr_t *nexthop;
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struct data_hdr *hdr;
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if(c->cb->forward == NULL) {
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return 0;
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}
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nexthop = c->cb->forward(c, &rimeaddr_node_addr, to, NULL, 0);
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if(nexthop == NULL) {
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PRINTF("mh_send: no route\n");
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return 0;
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} else {
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PRINTF("mh_send: sending data towards %d.%d\n",
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nexthop->u8[0], nexthop->u8[1]);
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if(rimebuf_hdralloc(sizeof(struct data_hdr))) {
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hdr = rimebuf_hdrptr();
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rimeaddr_copy(&hdr->dest, to);
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rimeaddr_copy(&hdr->originator, &rimeaddr_node_addr);
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hdr->hops = 1;
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uc_send(&c->c, nexthop);
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}
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return 1;
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}
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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