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nes-proj/core/net/rime/mesh.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.
*
* $Id: mesh.c,v 1.2 2007/03/15 20:04:30 adamdunkels Exp $
*/
/**
* \file
* A mesh routing protocol
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "contiki.h"
#include "net/rime.h"
#include "net/rime/route.h"
struct route_msg {
rimeaddr_t dest;
u8_t rreq_id;
u8_t pad;
};
struct data_hdr {
rimeaddr_t dest;
rimeaddr_t originator;
u16_t seqno;
};
struct rrep_hdr {
u8_t rreq_id;
u8_t hops;
rimeaddr_t dest;
rimeaddr_t originator;
};
struct mesh_conn {
struct uc_conn dataconn;
struct uc_conn rrepconn;
struct nf_conn rreqconn;
rimeaddr_t last_rreq_originator;
u16_t last_rreq_id;
u16_t rreq_id;
struct queuebuf *queued_data;
rimeaddr_t queued_data_dest;
const struct mesh_callbacks *cb;
};
static struct mesh_conn mc;
static void (* send_datapacket_handler)(rimeaddr_t *next) = NULL;
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static void
send_rreq(rimeaddr_t *dest)
{
struct route_msg *msg;
rimebuf_clear();
msg = rimebuf_dataptr();
rimebuf_set_datalen(sizeof(struct route_msg));
msg->pad = 0;
msg->rreq_id = mc.rreq_id;
rimeaddr_copy(&msg->dest, dest);
nf_send(&mc.rreqconn);
}
/*---------------------------------------------------------------------------*/
static void
send_data(rimeaddr_t *to, struct route_entry *next)
{
struct data_hdr *hdr;
if(rimebuf_hdrextend(sizeof(struct data_hdr))) {
hdr = rimebuf_hdrptr();
rimeaddr_copy(&hdr->dest, to);
rimeaddr_copy(&hdr->originator, &rimeaddr_node_addr);
uc_send(&mc.dataconn, &next->nexthop);
}
}
/*---------------------------------------------------------------------------*/
static void
send_rrep(rimeaddr_t *dest)
{
struct rrep_hdr *rrepmsg;
struct route_entry *rt;
rimebuf_clear();
rrepmsg = rimebuf_dataptr();
rimebuf_set_datalen(sizeof(struct data_hdr));
rrepmsg->hops = 0;
rimeaddr_copy(&rrepmsg->dest, dest);
rimeaddr_copy(&rrepmsg->originator, &rimeaddr_node_addr);
rt = route_lookup(dest);
if(rt != NULL) {
PRINTF("send_rrep to %d via %d\n", dest->u16, rt->nexthop.u16);
uc_send(&mc.rrepconn, &rt->nexthop);
}
}
/*---------------------------------------------------------------------------*/
static void
insert_route(rimeaddr_t *originator, rimeaddr_t *last_hop, u8_t hops)
{
struct route_entry *rt;
rt = route_lookup(originator);
if(rt == NULL || hops < rt->hop_count) {
PRINTF("%d: Inserting %d into routing table, next hop %d, hop count %d\n",
rimeaddr_node_addr.u16, originator->u16, last_hop->u16, hops);
route_add(originator, last_hop, hops, 0);
}
}
/*---------------------------------------------------------------------------*/
static rimeaddr_t *
handle_datapacket(rimeaddr_t *from)
{
struct data_hdr *msg = rimebuf_dataptr();
struct route_entry *rt;
rimeaddr_t dest;
PRINTF("data_packet_received from %d towards %d len %d\n", from->u16,
msg->dest.u16,
rimebuf_datalen());
/* insert_route(msg->originator, from, msg->hops);*/
if(rimeaddr_cmp(&msg->dest, &rimeaddr_node_addr)) {
PRINTF("for us!\n");
rimebuf_hdrreduce(sizeof(struct data_hdr));
mc.cb->recv(&msg->originator);
} else {
rimeaddr_copy(&dest, &msg->dest);
rt = route_lookup(&msg->dest);
if(rt != NULL) {
PRINTF("forwarding to %d\n", rt->nexthop.u16);
/* msg->hops++;*/
return &rt->nexthop;
/* uc_send(c, &rt->nexthop);*/
} else {
PRINTF("%d: no route to %d\n", rimeaddr_node_addr.u16, msg->dest.u16);
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
static void
data_packet_received(struct uc_conn *c, rimeaddr_t *from)
{
rimeaddr_t *forward;
forward = handle_datapacket(from);
if(forward) {
uc_send(c, forward);
}
}
/*---------------------------------------------------------------------------*/
void
mesh_data_received(rimeaddr_t *from)
{
rimeaddr_t *nexthop_addr;
nexthop_addr = handle_datapacket(from);
if(nexthop_addr && send_datapacket_handler) {
send_datapacket_handler(nexthop_addr);
}
}
/*---------------------------------------------------------------------------*/
static void
rrep_packet_received(struct uc_conn *c, rimeaddr_t *from)
{
struct rrep_hdr *msg = rimebuf_dataptr();
struct route_entry *rt;
rimeaddr_t dest;
PRINTF("rrep_packet_received from %d towards %d len %d\n", from->u16,
msg->dest.u16,
rimebuf_datalen());
insert_route(&msg->originator, from, msg->hops);
if(rimeaddr_cmp(&msg->dest, &rimeaddr_node_addr)) {
PRINTF("for us!\n");
if(rimeaddr_cmp(&msg->originator, &mc.queued_data_dest) &&
mc.queued_data != NULL) {
PRINTF("Got RREP for us from %d. queued packet to %d\n",
msg->originator.u16, mc.queued_data_dest.u16);
queuebuf_to_rimebuf(mc.queued_data);
mc.queued_data = NULL;
rt = route_lookup(&mc.queued_data_dest);
if(rt != NULL) {
PRINTF("Sending data to %d through %d\n", mc.queued_data_dest.u16,
rt->nexthop.u16);
send_data(&mc.queued_data_dest, rt);
}
}
} else {
rimeaddr_copy(&dest, &msg->dest);
rt = route_lookup(&msg->dest);
if(rt != NULL) {
PRINTF("forwarding to %d\n", rt->nexthop.u16);
msg->hops++;
uc_send(c, &rt->nexthop);
} else {
PRINTF("%d: no route to %d\n", rimeaddr_node_addr.u16, msg->dest.u16);
}
}
}
/*---------------------------------------------------------------------------*/
static int
rreq_packet_received(struct nf_conn *c, rimeaddr_t *from,
rimeaddr_t *originator, u8_t seqno, u8_t hops)
{
struct route_msg *msg = rimebuf_dataptr();
/* PRINTF("route_packet_received from %d hops %d\n", from, hops);*/
if(!(rimeaddr_cmp(&mc.last_rreq_originator, originator) &&
mc.last_rreq_id <= msg->rreq_id)) {
rimeaddr_copy(&mc.last_rreq_originator, originator);
mc.last_rreq_id = msg->rreq_id;
if(rimeaddr_cmp(&msg->dest, &rimeaddr_node_addr)) {
PRINTF("route_packet_received: route request for our ID\n");
insert_route(originator, from, hops);
/* Send route reply back to source. */
send_rrep(originator);
return 0; /* Don't continue to flood the rreq packet. */
} else {
/* PRINTF("route request for %d\n", msg->dest_id);*/
insert_route(originator, from, hops);
}
return 1;
}
return 0; /* Don't forward packet. */
}
/*---------------------------------------------------------------------------*/
static const struct uc_callbacks data_callbacks = {data_packet_received};
static const struct uc_callbacks rrep_callbacks = {rrep_packet_received};
static const struct nf_callbacks rreq_callbacks = {rreq_packet_received, NULL};
/*---------------------------------------------------------------------------*/
void
mesh_setup(const struct mesh_callbacks *callbacks,
void (* send_datapacket)(rimeaddr_t *next))
{
uc_setup(&mc.dataconn, CHANNEL_MESH_DATA, &data_callbacks);
uc_setup(&mc.rrepconn, CHANNEL_MESH_RREP, &rrep_callbacks);
nf_setup(&mc.rreqconn, CHANNEL_MESH_RREQ, &rreq_callbacks);
mc.cb = callbacks;
send_datapacket_handler = send_datapacket;
}
/*---------------------------------------------------------------------------*/
int
mesh_send(rimeaddr_t *to)
{
struct route_entry *rt;
rt = route_lookup(to);
if(rt == NULL) {
if(mc.queued_data == NULL) {
PRINTF("mesh_send: queueing data, sending rreq\n");
mc.queued_data = queuebuf_new_from_rimebuf();
rimeaddr_copy(&mc.queued_data_dest, to);
send_rreq(to);
return 1;
}
return 0;
} else {
PRINTF("mesh_send: sending data\n");
send_data(to, rt);
return 1;
}
}
/*---------------------------------------------------------------------------*/
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