nes-proj/examples/rpl-border-router/embedded/slip-bridge.c

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/*
* Copyright (c) 2010, 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.
*
*/
/**
* \file
* Slip fallback interface
* \author
* Niclas Finne <nfi@sics.se>
* Joakim Eriksson <joakime@sics.se>
* Joel Hoglund <joel@sics.se>
* Nicolas Tsiftes <nvt@sics.se>
*/
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/*---------------------------------------------------------------------------*/
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#include "net/ipv6/uip.h"
#include "net/ipv6/uip-ds6.h"
#include "dev/slip.h"
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#include <string.h>
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/*---------------------------------------------------------------------------*/
#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
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/*---------------------------------------------------------------------------*/
/* Log configuration */
#include "sys/log.h"
#define LOG_MODULE "SLIP"
#define LOG_LEVEL LOG_LEVEL_NONE
/*---------------------------------------------------------------------------*/
void set_prefix_64(uip_ipaddr_t *);
static uip_ipaddr_t last_sender;
/*---------------------------------------------------------------------------*/
void
request_prefix(void)
{
/* mess up uip_buf with a dirty request... */
uip_buf[0] = '?';
uip_buf[1] = 'P';
uip_len = 2;
slip_send();
uip_clear_buf();
}
/*---------------------------------------------------------------------------*/
static void
slip_input_callback(void)
{
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LOG_DBG("SIN: %u\n", uip_len);
if(uip_buf[0] == '!') {
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LOG_INFO("Got configuration message of type %c\n", uip_buf[1]);
uip_clear_buf();
if(uip_buf[1] == 'P') {
uip_ipaddr_t prefix;
/* Here we set a prefix !!! */
memset(&prefix, 0, 16);
memcpy(&prefix, &uip_buf[2], 8);
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LOG_INFO("Setting prefix ");
LOG_INFO_6ADDR(&prefix);
LOG_INFO_("\n");
set_prefix_64(&prefix);
}
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} else if(uip_buf[0] == '?') {
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LOG_INFO("Got request message of type %c\n", uip_buf[1]);
if(uip_buf[1] == 'M') {
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char *hexchar = "0123456789abcdef";
int j;
/* this is just a test so far... just to see if it works */
uip_buf[0] = '!';
for(j = 0; j < 8; j++) {
uip_buf[2 + j * 2] = hexchar[uip_lladdr.addr[j] >> 4];
uip_buf[3 + j * 2] = hexchar[uip_lladdr.addr[j] & 15];
}
uip_len = 18;
slip_send();
}
uip_clear_buf();
}
/* Save the last sender received over SLIP to avoid bouncing the
packet back if no route is found */
uip_ipaddr_copy(&last_sender, &UIP_IP_BUF->srcipaddr);
}
/*---------------------------------------------------------------------------*/
static void
init(void)
{
slip_arch_init();
process_start(&slip_process, NULL);
slip_set_input_callback(slip_input_callback);
}
/*---------------------------------------------------------------------------*/
static int
output(void)
{
if(uip_ipaddr_cmp(&last_sender, &UIP_IP_BUF->srcipaddr)) {
/* Do not bounce packets back over SLIP if the packet was received
over SLIP */
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LOG_ERR("slip-bridge: Destination off-link but no route src=");
LOG_ERR_6ADDR(&UIP_IP_BUF->srcipaddr);
LOG_ERR_(" dst=");
LOG_ERR_6ADDR(&UIP_IP_BUF->destipaddr);
LOG_ERR_("\n");
} else {
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LOG_DBG("SUT: %u\n", uip_len);
slip_send();
}
return 0;
}
/*---------------------------------------------------------------------------*/
const struct uip_fallback_interface rpl_interface = {
init, output
};
/*---------------------------------------------------------------------------*/