nes-proj/core/net/rime/multihop.c

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/*
* 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.
*
*/
/**
* \file
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* Multihop forwarding
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* \author
* Adam Dunkels <adam@sics.se>
*/
/**
* \addtogroup rime
* @{
*/
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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"
#include <string.h>
static const struct packetbuf_attrlist attributes[] =
{
MULTIHOP_ATTRIBUTES
PACKETBUF_ATTR_LAST
};
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#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
void
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;
linkaddr_t *nexthop;
linkaddr_t sender, receiver;
/* Copy the packet attributes to avoid them being overwritten or
cleared by an application program that uses the packet buffer for
its own needs. */
linkaddr_copy(&sender, packetbuf_addr(PACKETBUF_ADDR_ESENDER));
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",
from->u8[0], from->u8[1],
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packetbuf_addr(PACKETBUF_ADDR_ERECEIVER)->u8[0],
packetbuf_addr(PACKETBUF_ADDR_ERECEIVER)->u8[1],
packetbuf_datalen());
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if(linkaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_ERECEIVER),
&linkaddr_node_addr)) {
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PRINTF("for us!\n");
if(c->cb->recv) {
c->cb->recv(c, &sender, from,
packetbuf_attr(PACKETBUF_ATTR_HOPS));
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}
} else {
nexthop = NULL;
if(c->cb->forward) {
packetbuf_set_attr(PACKETBUF_ATTR_HOPS,
packetbuf_attr(PACKETBUF_ATTR_HOPS) + 1);
nexthop = c->cb->forward(c, &sender, &receiver,
from, packetbuf_attr(PACKETBUF_ATTR_HOPS) - 1);
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}
if(nexthop) {
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PRINTF("forwarding to %d.%d\n", nexthop->u8[0], nexthop->u8[1]);
unicast_send(&c->c, nexthop);
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}
}
}
/*---------------------------------------------------------------------------*/
static const struct unicast_callbacks data_callbacks = { data_packet_received };
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/*---------------------------------------------------------------------------*/
void
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multihop_open(struct multihop_conn *c, uint16_t channel,
const struct multihop_callbacks *callbacks)
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{
unicast_open(&c->c, channel, &data_callbacks);
channel_set_attributes(channel, attributes);
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c->cb = callbacks;
}
/*---------------------------------------------------------------------------*/
void
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multihop_close(struct multihop_conn *c)
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{
unicast_close(&c->c);
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}
/*---------------------------------------------------------------------------*/
int
multihop_send(struct multihop_conn *c, const linkaddr_t *to)
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{
linkaddr_t *nexthop;
if(c->cb->forward == NULL) {
return 0;
}
packetbuf_compact();
packetbuf_set_addr(PACKETBUF_ADDR_ERECEIVER, to);
packetbuf_set_addr(PACKETBUF_ADDR_ESENDER, &linkaddr_node_addr);
packetbuf_set_attr(PACKETBUF_ATTR_HOPS, 1);
nexthop = c->cb->forward(c, &linkaddr_node_addr, to, NULL, 0);
if(nexthop == NULL) {
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PRINTF("multihop_send: no route\n");
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return 0;
} else {
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PRINTF("multihop_send: sending data towards %d.%d\n",
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nexthop->u8[0], nexthop->u8[1]);
unicast_send(&c->c, nexthop);
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return 1;
}
}
/*---------------------------------------------------------------------------*/
void
multihop_resend(struct multihop_conn *c, const linkaddr_t *nexthop)
{
unicast_send(&c->c, nexthop);
}
/*---------------------------------------------------------------------------*/
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/** @} */