6463c91a4f
Adam Dunkels writes on 2/5/2017 on the Contiki mailing list: [...] the original idea was that the application could just point the uip_appdata pointer to wherever the data was, but we then changed it so that the data actually had to be copied into the uip_aligned_buf buffer. So, yes, the network device driver should only need to read from this buffer. [...] This change removes comments on the possibility of uip_appdata pointing somewhere outside the uip_aligned_buf. And it removes code in the SLIP drivers not necessary anymore. Additionally it makes code in a SLIP driver optional that takes care of the Microsoft-specific CLIENT / SERVER / CLIENTSERVER chat.
497 lines
12 KiB
C
497 lines
12 KiB
C
/* -*- C -*- */
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/*
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* Copyright (c) 2005, 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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* This file is part of the Contiki operating system.
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include "contiki.h"
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#include "net/linkaddr.h"
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#include "sys/ctimer.h"
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#include "net/ip/uip.h"
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#include "net/ipv4/uip-fw.h"
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#define BUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
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#include "dev/slip.h"
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#include "../sicslow_ethernet.h"
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#include <stdlib.h>
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#include "dev/stm32w-radio.h"
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#define SLIP_END 0300
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#define SLIP_ESC 0333
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#define SLIP_ESC_END 0334
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#define SLIP_ESC_ESC 0335
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PROCESS(slip_process, "SLIP driver");
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uint8_t slip_active;
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#if 1
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#define SLIP_STATISTICS(statement)
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#else
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uint16_t slip_rubbish, slip_twopackets, slip_overflow, slip_ip_drop;
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#define SLIP_STATISTICS(statement) statement
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#endif
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/* Must be at least one byte larger than UIP_BUFSIZE! */
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#define RX_BUFSIZE (UIP_BUFSIZE - UIP_LLH_LEN + 16)
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enum {
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STATE_TWOPACKETS = 0, /* We have 2 packets and drop incoming data. */
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STATE_OK = 1,
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STATE_ESC = 2,
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STATE_RUBBISH = 3,
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};
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/*
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* Variables begin and end manage the buffer space in a cyclic
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* fashion. The first used byte is at begin and end is one byte past
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* the last. I.e. [begin, end) is the actively used space.
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*
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* If begin != pkt_end we have a packet at [begin, pkt_end),
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* furthermore, if state == STATE_TWOPACKETS we have one more packet at
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* [pkt_end, end). If more bytes arrive in state STATE_TWOPACKETS
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* they are discarded.
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*/
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static uint8_t state = STATE_TWOPACKETS;
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static uint16_t begin, end;
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static uint8_t rxbuf[RX_BUFSIZE];
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static uint16_t pkt_end; /* SLIP_END tracker. */
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struct uip_eth_addr slip_eth_addr = {{0}};
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const struct uip_eth_addr eth_addr_null = {{0}};
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static struct ctimer t;
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static void request_mac(void *);
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uint8_t mac_hextoi(struct uip_eth_addr *a, const char * mac);
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//static void (* input_callback)(void) = NULL;
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static void (* tcpip_input_callback)(void) = NULL;
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/*---------------------------------------------------------------------------*/
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//void
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//slip_set_input_callback(void (*c)(void))
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//{
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// input_callback = c;
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//}
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/*---------------------------------------------------------------------------*/
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void
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slip_set_tcpip_input_callback(void (*c)(void))
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{
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tcpip_input_callback = c;
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}
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/*---------------------------------------------------------------------------*/
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#if NETSTACK_CONF_WITH_IPV4
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uint8_t
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slip_send(void)
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{
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uint16_t i;
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uint8_t *ptr;
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uint8_t c;
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slip_arch_writeb(SLIP_END);
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ptr = &uip_buf[UIP_LLH_LEN];
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for(i = 0; i < uip_len; ++i) {
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c = *ptr++;
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if(c == SLIP_END) {
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slip_arch_writeb(SLIP_ESC);
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c = SLIP_ESC_END;
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} else if(c == SLIP_ESC) {
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slip_arch_writeb(SLIP_ESC);
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c = SLIP_ESC_ESC;
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}
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slip_arch_writeb(c);
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}
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slip_arch_writeb(SLIP_END);
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return UIP_FW_OK;
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}
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#endif /* NETSTACK_CONF_WITH_IPV4 */
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/*---------------------------------------------------------------------------*/
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uint8_t
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slip_write(const void *_ptr, int len)
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{
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const uint8_t *ptr = _ptr;
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uint16_t i;
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uint8_t c;
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slip_arch_writeb(SLIP_END);
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for(i = 0; i < len; ++i) {
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c = *ptr++;
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if(c == SLIP_END) {
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slip_arch_writeb(SLIP_ESC);
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c = SLIP_ESC_END;
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} else if(c == SLIP_ESC) {
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slip_arch_writeb(SLIP_ESC);
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c = SLIP_ESC_ESC;
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}
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slip_arch_writeb(c);
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}
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slip_arch_writeb(SLIP_END);
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return len;
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}
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/*---------------------------------------------------------------------------*/
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static void
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rxbuf_init(void)
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{
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begin = end = pkt_end = 0;
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state = STATE_OK;
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}
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/*---------------------------------------------------------------------------*/
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int from_slipbuffer(uint8_t *outbuf, uint16_t blen)
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{
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/*
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* Interrupt can not change begin but may change pkt_end.
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* If pkt_end != begin it will not change again.
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*/
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if(begin != pkt_end) {
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uint16_t len;
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if(begin < pkt_end) {
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len = pkt_end - begin;
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if(len > blen) {
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len = 0;
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} else {
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memcpy(outbuf, &rxbuf[begin], len);
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}
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} else {
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len = (RX_BUFSIZE - begin) + (pkt_end - 0);
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if(len > blen) {
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len = 0;
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} else {
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unsigned i;
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for(i = begin; i < RX_BUFSIZE; i++) {
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*outbuf++ = rxbuf[i];
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}
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for(i = 0; i < pkt_end; i++) {
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*outbuf++ = rxbuf[i];
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}
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}
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}
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/* Remove data from buffer together with the copied packet. */
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begin = pkt_end;
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if(state == STATE_TWOPACKETS) {
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pkt_end = end;
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state = STATE_OK; /* Assume no bytes where lost! */
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/* One more packet is buffered, need to be polled again! */
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process_poll(&slip_process);
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}
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return len;
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}
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return 0;
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}
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/* Upper half does the polling. */
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static uint16_t
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slip_poll_handler(uint8_t *outbuf, uint16_t blen)
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{
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/* This is a hack and won't work across buffer edge! */
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#if 0
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if(rxbuf[begin] == 'C') {
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int i;
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if(begin < end && (end - begin) >= 6
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&& memcmp(&rxbuf[begin], "CLIENT", 6) == 0) {
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state = STATE_TWOPACKETS; /* Interrupts do nothing. */
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memset(&rxbuf[begin], 0x0, 6);
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rxbuf_init();
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for(i = 0; i < 13; i++) {
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slip_arch_writeb("CLIENTSERVER\300"[i]);
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}
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return 0;
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}
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}
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#endif
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if(rxbuf[begin] == '?' || rxbuf[begin] == '!') { // Should this characters be escaped?
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uint8_t tmpbuf[14];
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from_slipbuffer(tmpbuf, 14);
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if(tmpbuf[0] == '?') {
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int j;
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char* hexchar = "0123456789abcdef";
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if(tmpbuf[1] == 'M') {
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/* this is just a test so far... just to see if it works */
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slip_arch_writeb('!');
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slip_arch_writeb('M');
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for(j = 0; j < LINKADDR_SIZE; j++) {
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slip_arch_writeb(hexchar[linkaddr_node_addr.u8[j] >> 4]);
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slip_arch_writeb(hexchar[linkaddr_node_addr.u8[j] & 15]);
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}
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slip_arch_writeb(SLIP_END);
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return 0;
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}
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}
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#if 1
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else if(tmpbuf[0] == '!') {
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if(tmpbuf[1] == 'M') {
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char * mac = (char *)tmpbuf + 2;
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if(mac_hextoi(&slip_eth_addr,mac)!=0){
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/* Error! */
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/*rxbuf_init();
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slip_arch_writeb('!');
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slip_arch_writeb('E');
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slip_arch_writeb(SLIP_END);*/
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printf("Error! Incorrect MAC format.\n");
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}
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/*for(int i=0;i<6;i++)
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printf("%02X ",slip_eth_addr.addr[i]);
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printf("\n"); */
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return 0;
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}
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else if(memcmp(&tmpbuf[1], "OS1", 3) == 0) {
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enable_sniffer_mode(1);
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return 0;
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}
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else if(memcmp(&tmpbuf[1], "OS0",3) == 0) {
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enable_sniffer_mode(0);
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return 0;
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}
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else if(memcmp(&tmpbuf[1], "OC", 2) == 0) {
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short ch_num;
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tmpbuf[5]='\0';
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if(ch_num = atoi((char *)tmpbuf+3)){
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ST_RadioSetChannel(ch_num);
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}
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return 0;
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}
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}
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}
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#endif
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return from_slipbuffer(outbuf, blen);
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(slip_process, ev, data)
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{
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PROCESS_BEGIN();
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rxbuf_init();
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ctimer_set(&t, 2*CLOCK_SECOND, request_mac, NULL);
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while(1) {
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PROCESS_YIELD_UNTIL(ev == PROCESS_EVENT_POLL);
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slip_active = 1;
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/* Move packet from rxbuf to buffer provided by uIP. */
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uip_len = slip_poll_handler(&uip_buf[UIP_LLH_LEN],
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UIP_BUFSIZE - UIP_LLH_LEN);
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#if !NETSTACK_CONF_WITH_IPV6
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if(uip_len == 4 && strncmp((char*)&uip_buf[UIP_LLH_LEN], "?IPA", 4) == 0) {
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char buf[8];
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memcpy(&buf[0], "=IPA", 4);
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memcpy(&buf[4], &uip_hostaddr, 4);
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if(input_callback) {
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input_callback();
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}
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slip_write(buf, 8);
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} else if(uip_len > 0
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&& uip_len == (((uint16_t)(BUF->len[0]) << 8) + BUF->len[1])
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&& uip_ipchksum() == 0xffff) {
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#define IP_DF 0x40
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if(BUF->ipid[0] == 0 && BUF->ipid[1] == 0 && BUF->ipoffset[0] & IP_DF) {
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static uint16_t ip_id;
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uint16_t nid = ip_id++;
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BUF->ipid[0] = nid >> 8;
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BUF->ipid[1] = nid;
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nid = htons(nid);
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nid = ~nid; /* negate */
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BUF->ipchksum += nid; /* add */
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if(BUF->ipchksum < nid) { /* 1-complement overflow? */
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BUF->ipchksum++;
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}
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}
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if(tcpip_input_callback) {
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tcpip_input_callback();
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} else {
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tcpip_input();
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}
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} else {
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uip_clear_buf();
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SLIP_STATISTICS(slip_ip_drop++);
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}
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#else /* NETSTACK_CONF_WITH_IPV6 */
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if(uip_len > 0) {
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if(tcpip_input_callback) {
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tcpip_input_callback();
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} else {
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tcpip_input();
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}
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}
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#endif /* NETSTACK_CONF_WITH_IPV6 */
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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int
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slip_input_byte(unsigned char c)
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{
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switch(state) {
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case STATE_RUBBISH:
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if(c == SLIP_END) {
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state = STATE_OK;
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}
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return 0;
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case STATE_TWOPACKETS: /* Two packets are already buffered! */
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return 0;
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case STATE_ESC:
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if(c == SLIP_ESC_END) {
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c = SLIP_END;
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} else if(c == SLIP_ESC_ESC) {
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c = SLIP_ESC;
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} else {
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state = STATE_RUBBISH;
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SLIP_STATISTICS(slip_rubbish++);
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end = pkt_end; /* remove rubbish */
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return 0;
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}
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state = STATE_OK;
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break;
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case STATE_OK:
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if(c == SLIP_ESC) {
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state = STATE_ESC;
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return 0;
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} else if(c == SLIP_END) {
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/*
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* We have a new packet, possibly of zero length.
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*
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* There may already be one packet buffered.
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*/
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if(end != pkt_end) { /* Non zero length. */
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if(begin == pkt_end) { /* None buffered. */
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pkt_end = end;
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} else {
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state = STATE_TWOPACKETS;
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SLIP_STATISTICS(slip_twopackets++);
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}
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process_poll(&slip_process);
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return 1;
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}
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return 0;
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}
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break;
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}
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/* add_char: */
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{
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unsigned next;
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next = end + 1;
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if(next == RX_BUFSIZE) {
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next = 0;
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}
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if(next == begin) { /* rxbuf is full */
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state = STATE_RUBBISH;
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SLIP_STATISTICS(slip_overflow++);
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end = pkt_end; /* remove rubbish */
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return 0;
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}
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rxbuf[end] = c;
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end = next;
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}
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/* There could be a separate poll routine for this. */
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if(c == 'T' && rxbuf[begin] == 'C') {
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process_poll(&slip_process);
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return 1;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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uint8_t mac_hextoi(struct uip_eth_addr *a, const char * mac)
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{
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int i,j;
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memset(a,0,sizeof(struct uip_eth_addr));
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for(i = 0, j = 0; j < 12; j++){
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if((mac[j] >= '0' && mac[j] <= '9')){
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a->addr[i] += (mac[j] - '0') * ((j & 1) ? 1 : 16);
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}
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else if(mac[j] >= 'A' && mac[j] <= 'F'){
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a->addr[i] += (mac[j] - 'A' + 10) * ((j & 1) ? 1 : 16);
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}
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else {
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return 1;
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}
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if(j&1){
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i++;
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}
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static void request_mac(void * ptr)
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{
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if(memcmp(&slip_eth_addr,ð_addr_null,6)==0){
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slip_write("?M", 2);
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ctimer_set(&t, 6*CLOCK_SECOND, request_mac, NULL);
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}
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}
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/*---------------------------------------------------------------------------*/
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