nes-proj/core/net/rime/polite-announcement.c
2015-05-18 08:53:17 +02:00

198 lines
5.9 KiB
C

/*
* 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.
*
*/
/**
* \file
* An example announcement back-end, based on the polite primitive
* \author
* Adam Dunkels <adam@sics.se>
*/
/**
* \addtogroup rimepoliteannouncement
* @{
*/
#include "contiki.h"
#include "sys/cc.h"
#include "lib/list.h"
#include "net/rime/rime.h"
#include "net/rime/announcement.h"
#include "net/rime/ipolite.h"
#if NETSIM
#include "ether.h"
#endif
#include <string.h>
#include <stdio.h>
#include <stddef.h>
struct announcement_data {
uint16_t id;
uint16_t value;
};
#ifdef POLITE_ANNOUNCEMENT_CONF_MAX_DUPS
#define NUM_DUPS POLITE_ANNOUNCEMENT_CONF_MAX_DUPS
#else /* POLITE_ANNOUNCEMENT_CONF_MAX_DUPS */
#define NUM_DUPS 5
#endif /* POLITE_ANNOUNCEMENT_CONF_MAX_DUPS */
#define ANNOUNCEMENT_MSG_HEADERLEN 2
struct announcement_msg {
uint16_t num;
struct announcement_data data[];
};
static struct polite_announcement_state {
struct ipolite_conn c;
struct ctimer t;
clock_time_t interval;
clock_time_t min_interval, max_interval;
} c;
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static void
send_adv(clock_time_t interval)
{
struct announcement_msg *adata;
struct announcement *a;
packetbuf_clear();
adata = packetbuf_dataptr();
adata->num = 0;
for(a = announcement_list(); a != NULL; a = list_item_next(a)) {
adata->data[adata->num].id = a->id;
adata->data[adata->num].value = a->value;
adata->num++;
}
packetbuf_set_datalen(ANNOUNCEMENT_MSG_HEADERLEN +
sizeof(struct announcement_data) * adata->num);
PRINTF("%d.%d: sending neighbor advertisement with %d announcements\n",
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1], adata->num);
if(adata->num > 0) {
/* Send the packet only if it contains more than zero announcements. */
ipolite_send(&c.c, interval, packetbuf_datalen());
}
}
/*---------------------------------------------------------------------------*/
static void
adv_packet_received(struct ipolite_conn *ipolite, const linkaddr_t *from)
{
struct announcement_msg adata;
struct announcement_data data;
uint8_t *ptr;
int i;
ptr = packetbuf_dataptr();
/* Copy number of announcements */
memcpy(&adata, ptr, sizeof(struct announcement_msg));
PRINTF("%d.%d: adv_packet_received from %d.%d with %d announcements\n",
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
from->u8[0], from->u8[1], adata.num);
if(ANNOUNCEMENT_MSG_HEADERLEN + adata.num * sizeof(struct announcement_data) > packetbuf_datalen()) {
/* The number of announcements is too large - corrupt packet has
been received. */
PRINTF("adata.num way out there: %d\n", adata.num);
return;
}
ptr += ANNOUNCEMENT_MSG_HEADERLEN;
for(i = 0; i < adata.num; ++i) {
/* Copy announcements */
memcpy(&data, ptr, sizeof(struct announcement_data));
announcement_heard(from, data.id, data.value);
ptr += sizeof(struct announcement_data);
}
}
/*---------------------------------------------------------------------------*/
static void
send_timer(void *ptr)
{
send_adv(c.interval);
ctimer_set(&c.t,
c.interval,
send_timer, &c);
c.interval = MIN(c.interval * 2, c.max_interval);
}
/*---------------------------------------------------------------------------*/
static void
new_announcement(uint16_t id, uint8_t has_value, uint16_t newval,
uint16_t oldval, uint8_t bump)
{
if(newval != oldval) {
c.interval = c.min_interval;
send_timer(&c);
}
}
/*---------------------------------------------------------------------------*/
static const struct ipolite_callbacks ipolite_callbacks =
{adv_packet_received, NULL, NULL};
/*---------------------------------------------------------------------------*/
void
polite_announcement_init(uint16_t channel,
clock_time_t min,
clock_time_t max)
{
ipolite_open(&c.c, channel, NUM_DUPS, &ipolite_callbacks);
c.min_interval = min;
c.max_interval = max;
announcement_register_observer_callback(new_announcement);
}
/*---------------------------------------------------------------------------*/
void
polite_announcement_stop(void)
{
ctimer_stop(&c.t);
ipolite_close(&c.c);
}
/*---------------------------------------------------------------------------*/
/** @} */