NAT64 / DNS64 code for Contiki that makes connecting an IPv6 Contiki network to IPv4 networks really easy
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Adam Dunkels
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core/net/ip64/ip64-slip-interface.c
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core/net/ip64/ip64-slip-interface.c
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/*
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* Copyright (c) 2012, Thingsquare, http://www.thingsquare.com/.
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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 copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "net/ip/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 "ip64.h"
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#include <string.h>
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#include <stdio.h>
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#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
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#define DEBUG DEBUG_NONE
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#include "net/ip/uip-debug.h"
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static uip_ipaddr_t last_sender;
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/*---------------------------------------------------------------------------*/
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void
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ip64_slip_interface_input(uint8_t *packet, uint16_t len)
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{
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/* Dummy definition: this function is not actually called, but must
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be here to conform to the ip65-interface.h structure. */
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}
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/*---------------------------------------------------------------------------*/
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static void
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input_callback(void)
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{
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/*PRINTF("SIN: %u\n", uip_len);*/
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if(uip_buf[0] == '!') {
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PRINTF("Got configuration message of type %c\n", uip_buf[1]);
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uip_len = 0;
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#if 0
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if(uip_buf[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[2], 8);
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PRINTF("Setting prefix ");
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PRINT6ADDR(&prefix);
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PRINTF("\n");
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set_prefix_64(&prefix);
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}
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#endif
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} else if(uip_buf[0] == '?') {
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PRINTF("Got request message of type %c\n", uip_buf[1]);
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if(uip_buf[1] == 'M') {
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const 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 < 8; 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_send();
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}
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uip_len = 0;
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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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uint16_t len = ip64_4to6(&uip_buf[UIP_LLH_LEN], uip_len,
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ip64_packet_buffer);
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if(len > 0) {
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memcpy(&uip_buf[UIP_LLH_LEN], ip64_packet_buffer, len);
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uip_len = len;
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/* PRINTF("send len %d\n", len); */
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} else {
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uip_len = 0;
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}
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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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PRINTF("ip64-slip-interface: init\n");
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// slip_arch_init(BAUD2UBR(115200));
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process_start(&slip_process, NULL);
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slip_set_input_callback(input_callback);
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}
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/*---------------------------------------------------------------------------*/
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static void
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output(void)
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{
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int len;
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PRINTF("ip64-slip-interface: output source ");
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/*
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PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
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PRINTF(" destination ");
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PRINT6ADDR(&UIP_IP_BUF->destipaddr);
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PRINTF("\n");
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*/
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if(uip_ipaddr_cmp(&last_sender, &UIP_IP_BUF->srcipaddr)) {
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PRINTF("ip64-interface: output, not sending bounced message\n");
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} else {
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len = ip64_6to4(&uip_buf[UIP_LLH_LEN], uip_len,
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ip64_packet_buffer);
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PRINTF("ip64-interface: output len %d\n", len);
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if(len > 0) {
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memcpy(&uip_buf[UIP_LLH_LEN], ip64_packet_buffer, len);
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uip_len = len;
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slip_send();
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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const struct uip_fallback_interface ip64_slip_interface = {
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init, output
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};
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/*---------------------------------------------------------------------------*/
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