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New file structure towards SLIP/PPP. Renamed tcp_*.c for 8.3 sake.
See lwip@sics.se Mon, 21 Oct 2002 magnus.ivarsson
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src/netif/slipif.c
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235
src/netif/slipif.c
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/*
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* Copyright (c) 2001, 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 built upon the file: src/arch/rtxc/netif/sioslip.c
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*
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* Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
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*/
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#include "netif/slipif.h"
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#include "lwip/debug.h"
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#include "lwip/def.h"
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#include "lwip/pbuf.h"
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#include "lwip/sys.h"
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#include "lwip/stats.h"
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#include "netif/sio.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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#define MAX_SIZE 1500
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#define SLIPIF_NUM_OF_INTERFACES 2
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typedef struct slip_status_t {
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void *sio;
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} slip_status_t;
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/* yes, this is ugly; TODO: should be dynamicaly allocated instead */
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static slip_status_t statusar[SLIPIF_NUM_OF_INTERFACES];
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/*-----------------------------------------------------------------------------------*/
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err_t slipif_output(struct netif *netif, struct pbuf *p, struct ip_addr *ipaddr)
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{
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slip_status_t *slipState = (slip_status_t *) netif->state;
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struct pbuf *q;
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int i;
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u8_t c;
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/* Send pbuf out on the serial I/O device. */
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sio_send(SLIP_END, slipState->sio);
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for(q = p; q != NULL; q = q->next) {
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for(i = 0; i < q->len; i++) {
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c = ((u8_t *)q->payload)[i];
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switch(c) {
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case SLIP_END:
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sio_send(SLIP_ESC, slipState->sio);
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sio_send(SLIP_ESC_END, slipState->sio);
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break;
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case SLIP_ESC:
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sio_send(SLIP_ESC, slipState->sio);
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sio_send(SLIP_ESC_ESC, slipState->sio);
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break;
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default:
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sio_send(c, slipState->sio);
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break;
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}
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}
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}
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sio_send(SLIP_END, slipState->sio);
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return 0;
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}
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/*-----------------------------------------------------------------------------------*/
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static struct pbuf * slipif_input( struct netif * netif )
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{
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slip_status_t *slipState = (slip_status_t *) netif->state;
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u8_t c;
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struct pbuf *p, *q;
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int recved;
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int i;
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q = p = NULL;
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recved = i = 0;
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c = 0;
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while ( 1 )
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{
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c = sio_recv( slipState->sio );
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switch ( c )
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{
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case SLIP_END:
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if ( p == NULL )
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{
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return slipif_input( netif );
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}
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if ( recved > 0 )
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{
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/* Received whole packet. */
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pbuf_realloc( q, recved );
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#ifdef LINK_STATS
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stats.link.recv++;
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#endif /* LINK_STATS */
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DEBUGF( SLIP_DEBUG, ("slipif: Got packet\n") );
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return q;
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}
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break;
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case SLIP_ESC:
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c = sio_recv( slipState->sio );
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switch ( c )
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{
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case SLIP_ESC_END:
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c = SLIP_END;
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break;
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case SLIP_ESC_ESC:
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c = SLIP_ESC;
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break;
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}
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/* FALLTHROUGH */
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default:
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if ( p == NULL )
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{
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DEBUGF( SLIP_DEBUG, ("slipif_input: alloc\n") );
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p = pbuf_alloc( PBUF_LINK, 128, PBUF_POOL );
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#ifdef LINK_STATS
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if ( p == NULL )
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{
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stats.link.drop++;
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DEBUGF( SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n") );
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}
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#endif /* LINK_STATS */
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if ( q != NULL )
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{
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pbuf_chain( q, p );
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}
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else
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{
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q = p;
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}
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}
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if ( p != NULL && recved < MAX_SIZE )
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{
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((u8_t *)p->payload)[i] = c;
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recved++;
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i++;
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if ( i >= p->len )
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{
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i = 0;
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p = NULL;
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}
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}
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break;
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}
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}
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return NULL;
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}
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/*-----------------------------------------------------------------------------------*/
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static void slipif_loop(void *nf)
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{
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struct pbuf *p;
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struct netif *netif = (struct netif *) nf;
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// slip_status_t *slipState = (slip_status_t *) netif->state;
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while(1) {
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p = slipif_input( netif );
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netif->input(p, netif);
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}
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}
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/*-----------------------------------------------------------------------------------*/
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// void
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// sioslipif_init0(struct netif *netif)
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// {
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// slip_status_t * ss;
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// printf("slipif_init0: netif->num=%x\n", (int)netif->num);
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//
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// netif->state = &statusar[0];
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// netif->name[0] = 's';
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// netif->name[1] = 'l';
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// netif->output = sioslipif_output;
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// netif->num = 0;
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//
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// sio_open( netif );
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// ss = (slip_status_t*)(netif->state);
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// printf("slipif_init0: netif=%x sio=0x%x\n", (int)netif, (int)(ss->sio));
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// sys_thread_new((void *)slipif_loop, netif);
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// }
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/*-----------------------------------------------------------------------------------*/
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void slipif_init(struct netif *netif)
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{
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slip_status_t *slipState;
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DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%x\n", (int)netif->num));
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if ( netif->num >= SLIPIF_NUM_OF_INTERFACES )
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{
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DEBUGF( SLIP_DEBUG, ("ERROR: To many slipifs"));
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return;
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}
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/* dynamic allocation would be nice */
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netif->state = &statusar[ netif->num ];
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netif->name[0] = 's';
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netif->name[1] = 'l';
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netif->output = slipif_output;
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slipState = (slip_status_t *) netif->state;
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slipState->sio = sio_open( netif->num );
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sys_thread_new(slipif_loop, netif);
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}
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/*-----------------------------------------------------------------------------------*/
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