85b494c16b
Followed by doxyen file and group tags. This patch is only a first attempt to make provide a clean structure, many more files require rework, too.
156 lines
5 KiB
C
156 lines
5 KiB
C
/*
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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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*/
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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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/**
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* \addtogroup rime
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* @{
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*/
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#include "contiki.h"
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#include "net/rime/rime.h"
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#include "net/rime/multihop.h"
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#include "net/rime/route.h"
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#include <string.h>
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static const struct packetbuf_attrlist attributes[] =
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{
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MULTIHOP_ATTRIBUTES
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PACKETBUF_ATTR_LAST
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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 unicast_conn *uc, const linkaddr_t *from)
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{
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struct multihop_conn *c = (struct multihop_conn *)uc;
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linkaddr_t *nexthop;
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linkaddr_t sender, receiver;
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/* Copy the packet attributes to avoid them being overwritten or
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cleared by an application program that uses the packet buffer for
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its own needs. */
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linkaddr_copy(&sender, packetbuf_addr(PACKETBUF_ADDR_ESENDER));
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linkaddr_copy(&receiver, packetbuf_addr(PACKETBUF_ADDR_ERECEIVER));
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PRINTF("data_packet_received from %d.%d towards %d.%d len %d\n",
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from->u8[0], from->u8[1],
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packetbuf_addr(PACKETBUF_ADDR_ERECEIVER)->u8[0],
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packetbuf_addr(PACKETBUF_ADDR_ERECEIVER)->u8[1],
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packetbuf_datalen());
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if(linkaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_ERECEIVER),
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&linkaddr_node_addr)) {
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PRINTF("for us!\n");
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if(c->cb->recv) {
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c->cb->recv(c, &sender, from,
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packetbuf_attr(PACKETBUF_ATTR_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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packetbuf_set_attr(PACKETBUF_ATTR_HOPS,
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packetbuf_attr(PACKETBUF_ATTR_HOPS) + 1);
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nexthop = c->cb->forward(c, &sender, &receiver,
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from, packetbuf_attr(PACKETBUF_ATTR_HOPS) - 1);
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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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unicast_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 unicast_callbacks data_callbacks = { data_packet_received };
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/*---------------------------------------------------------------------------*/
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void
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multihop_open(struct multihop_conn *c, uint16_t channel,
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const struct multihop_callbacks *callbacks)
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{
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unicast_open(&c->c, channel, &data_callbacks);
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channel_set_attributes(channel, attributes);
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c->cb = callbacks;
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}
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/*---------------------------------------------------------------------------*/
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void
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multihop_close(struct multihop_conn *c)
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{
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unicast_close(&c->c);
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}
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/*---------------------------------------------------------------------------*/
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int
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multihop_send(struct multihop_conn *c, const linkaddr_t *to)
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{
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linkaddr_t *nexthop;
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if(c->cb->forward == NULL) {
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return 0;
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}
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packetbuf_compact();
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packetbuf_set_addr(PACKETBUF_ADDR_ERECEIVER, to);
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packetbuf_set_addr(PACKETBUF_ADDR_ESENDER, &linkaddr_node_addr);
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packetbuf_set_attr(PACKETBUF_ATTR_HOPS, 1);
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nexthop = c->cb->forward(c, &linkaddr_node_addr, to, NULL, 0);
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if(nexthop == NULL) {
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PRINTF("multihop_send: no route\n");
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return 0;
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} else {
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PRINTF("multihop_send: sending data towards %d.%d\n",
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nexthop->u8[0], nexthop->u8[1]);
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unicast_send(&c->c, nexthop);
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return 1;
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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multihop_resend(struct multihop_conn *c, const linkaddr_t *nexthop)
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{
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unicast_send(&c->c, nexthop);
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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