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