nes-proj/os/services/ip64/ip64-slip-interface.c

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/*
* Copyright (c) 2012, Thingsquare, http://www.thingsquare.com/.
* 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.
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*
* 3. Neither the name of the copyright holder 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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.
*
*/
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#include "net/ipv6/uip.h"
#include "net/ipv6/uip-ds6.h"
#include "dev/slip.h"
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#include "ip64/ip64.h"
#include <string.h>
#include <stdio.h>
#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
#define DEBUG DEBUG_NONE
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#include "net/ipv6/uip-debug.h"
static uip_ipaddr_t last_sender;
/*---------------------------------------------------------------------------*/
void
ip64_slip_interface_input(uint8_t *packet, uint16_t len)
{
/* Dummy definition: this function is not actually called, but must
be here to conform to the ip65-interface.h structure. */
}
/*---------------------------------------------------------------------------*/
static void
input_callback(void)
{
/*PRINTF("SIN: %u\n", uip_len);*/
if(uip_buf[0] == '!') {
PRINTF("Got configuration message of type %c\n", uip_buf[1]);
uip_clear_buf();
#if 0
if(uip_buf[1] == 'P') {
uip_ipaddr_t prefix;
/* Here we set a prefix !!! */
memset(&prefix, 0, 16);
memcpy(&prefix, &uip_buf[2], 8);
PRINTF("Setting prefix ");
PRINT6ADDR(&prefix);
PRINTF("\n");
set_prefix_64(&prefix);
}
#endif
} else if(uip_buf[0] == '?') {
PRINTF("Got request message of type %c\n", uip_buf[1]);
if(uip_buf[1] == 'M') {
const 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();
} else {
/* 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);
uint16_t len = ip64_4to6(&uip_buf[UIP_LLH_LEN], uip_len,
ip64_packet_buffer);
if(len > 0) {
memcpy(&uip_buf[UIP_LLH_LEN], ip64_packet_buffer, len);
uip_len = len;
/* PRINTF("send len %d\n", len); */
} else {
uip_clear_buf();
}
}
}
/*---------------------------------------------------------------------------*/
static void
init(void)
{
PRINTF("ip64-slip-interface: init\n");
// slip_arch_init(BAUD2UBR(115200));
process_start(&slip_process, NULL);
slip_set_input_callback(input_callback);
}
/*---------------------------------------------------------------------------*/
static int
output(void)
{
int len;
PRINTF("ip64-slip-interface: output source ");
/*
PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
PRINTF(" destination ");
PRINT6ADDR(&UIP_IP_BUF->destipaddr);
PRINTF("\n");
*/
if(uip_ipaddr_cmp(&last_sender, &UIP_IP_BUF->srcipaddr)) {
PRINTF("ip64-interface: output, not sending bounced message\n");
} else {
len = ip64_6to4(&uip_buf[UIP_LLH_LEN], uip_len,
ip64_packet_buffer);
PRINTF("ip64-interface: output len %d\n", len);
if(len > 0) {
memcpy(&uip_buf[UIP_LLH_LEN], ip64_packet_buffer, len);
uip_len = len;
slip_send();
return len;
}
}
return 0;
}
/*---------------------------------------------------------------------------*/
const struct uip_fallback_interface ip64_slip_interface = {
init, output
};
/*---------------------------------------------------------------------------*/