contiki/examples/ipv6/rpl-border-router/slip-bridge.c

117 lines
3.9 KiB
C

/*
* 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.
*
* $Id: slip-bridge.c,v 1.1 2010/05/05 19:44:30 joxe Exp $
*/
/**
* \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>
*/
#include "net/uip.h"
#include "net/uip-ds6.h"
#include "rpl.h"
#include "dev/slip.h"
#include "dev/uart1.h"
#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
#define DEBUG DEBUG_PRINT
#include "net/uip-debug.h"
static uip_ipaddr_t last_sender;
/*---------------------------------------------------------------------------*/
static void
slip_input_callback(void)
{
PRINTF("SIN: %u\n", uip_len);
/* 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(BAUD2UBR(115200));
process_start(&slip_process, NULL);
slip_set_input_callback(slip_input_callback);
}
/*---------------------------------------------------------------------------*/
static void
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 */
PRINTF("slip-bridge: Destination off-link but no route\n");
} else {
PRINTF("SUT: %u\n", uip_len);
slip_send();
}
}
/*---------------------------------------------------------------------------*/
int
putchar(int c)
{
#define SLIP_END 0300
static char debug_frame = 0;
if(!debug_frame) { /* Start of debug output */
slip_arch_writeb(SLIP_END);
slip_arch_writeb('\r'); /* Type debug line == '\r' */
debug_frame = 1;
}
/* Need to also print '\n' because for example COOJA will not show
any output before line end */
slip_arch_writeb((char)c);
/*
* Line buffered output, a newline marks the end of debug output and
* implicitly flushes debug output.
*/
if(c == '\n') {
slip_arch_writeb(SLIP_END);
debug_frame = 0;
}
return c;
}
/*---------------------------------------------------------------------------*/
const struct uip_fallback_interface rpl_interface = {
init, output
};
/*---------------------------------------------------------------------------*/