mirror of
https://github.com/ep00ch/lwip-contrib-mac.git
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308 lines
8.4 KiB
C
308 lines
8.4 KiB
C
/*
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* Copyright (c) 2001-2003 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 modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <sys/socket.h>
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#include "lwip/debug.h"
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#include "lwip/opt.h"
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#include "lwip/def.h"
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#include "lwip/ip.h"
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#include "lwip/mem.h"
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#include "lwip/netif.h"
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#include "lwip/pbuf.h"
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#include "lwip/sys.h"
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#define IFNAME0 't'
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#define IFNAME1 'n'
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struct tunif {
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/* Add whatever per-interface state that is needed here. */
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int fd;
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};
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/* Forward declarations. */
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static void tunif_input(struct netif *netif);
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static err_t tunif_output(struct netif *netif, struct pbuf *p,
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struct ip_addr *ipaddr);
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static void tunif_thread(void *data);
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/*-----------------------------------------------------------------------------------*/
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static void
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low_level_init(struct netif *netif)
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{
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struct tunif *tunif;
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char buf[100];
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tunif = netif->state;
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/* Obtain MAC address from network interface. */
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/* Do whatever else is needed to initialize interface. */
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tunif->fd = open("/dev/tun0", O_RDWR);
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LWIP_DEBUGF(TUNIF_DEBUG, ("tunif_init: fd %d\n", tunif->fd));
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if (tunif->fd == -1) {
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perror("tunif_init");
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exit(1);
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}
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snprintf(buf, sizeof(buf), "/sbin/ifconfig tun0 inet %d.%d.%d.%d %d.%d.%d.%d",
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ip4_addr1(&(netif->gw)),
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ip4_addr2(&(netif->gw)),
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ip4_addr3(&(netif->gw)),
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ip4_addr4(&(netif->gw)),
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ip4_addr1(&(netif->ip_addr)),
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ip4_addr2(&(netif->ip_addr)),
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ip4_addr3(&(netif->ip_addr)),
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ip4_addr4(&(netif->ip_addr)));
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LWIP_DEBUGF(TUNIF_DEBUG, ("tunif_init: system(\"%s\");\n", buf));
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system(buf);
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sys_thread_new("tunif_thread", tunif_thread, netif, DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO);
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* low_level_output():
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*
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* Should do the actual transmission of the packet. The packet is
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* contained in the pbuf that is passed to the function. This pbuf
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* might be chained.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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static err_t
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low_level_output(struct tunif *tunif, struct pbuf *p)
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{
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struct pbuf *q;
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char buf[1500];
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char *bufptr;
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/* initiate transfer(); */
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if (((double)rand()/(double)RAND_MAX) < 0.4) {
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printf("drop\n");
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return ERR_OK;
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}
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bufptr = &buf[0];
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for(q = p; q != NULL; q = q->next) {
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/* Send the data from the pbuf to the interface, one pbuf at a
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time. The size of the data in each pbuf is kept in the ->len
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variable. */
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/* send data from(q->payload, q->len); */
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bcopy(q->payload, bufptr, q->len);
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bufptr += q->len;
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}
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/* signal that packet should be sent(); */
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if (write(tunif->fd, buf, p->tot_len) == -1) {
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perror("tunif: write");
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}
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return ERR_OK;
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* low_level_input():
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*
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* Should allocate a pbuf and transfer the bytes of the incoming
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* packet from the interface into the pbuf.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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static struct pbuf *
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low_level_input(struct tunif *tunif)
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{
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struct pbuf *p, *q;
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u16_t len;
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char buf[1500];
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char *bufptr;
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/* Obtain the size of the packet and put it into the "len"
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variable. */
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len = read(tunif->fd, buf, sizeof(buf));
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/* if (((double)rand()/(double)RAND_MAX) < 0.1) {
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printf("drop\n");
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return NULL;
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}*/
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/* We allocate a pbuf chain of pbufs from the pool. */
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p = pbuf_alloc(PBUF_LINK, len, PBUF_POOL);
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if (p != NULL) {
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/* We iterate over the pbuf chain until we have read the entire
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packet into the pbuf. */
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bufptr = &buf[0];
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for(q = p; q != NULL; q = q->next) {
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/* Read enough bytes to fill this pbuf in the chain. The
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available data in the pbuf is given by the q->len
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variable. */
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/* read data into(q->payload, q->len); */
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bcopy(bufptr, q->payload, q->len);
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bufptr += q->len;
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}
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/* acknowledge that packet has been read(); */
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} else {
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/* drop packet(); */
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}
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return p;
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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tunif_thread(void *arg)
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{
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struct netif *netif;
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struct tunif *tunif;
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fd_set fdset;
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int ret;
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netif = arg;
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tunif = netif->state;
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while (1) {
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FD_ZERO(&fdset);
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FD_SET(tunif->fd, &fdset);
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/* Wait for a packet to arrive. */
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ret = select(tunif->fd + 1, &fdset, NULL, NULL, NULL);
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if (ret == 1) {
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/* Handle incoming packet. */
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tunif_input(netif);
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} else if (ret == -1) {
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perror("tunif_thread: select");
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}
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}
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* tunif_output():
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*
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* This function is called by the TCP/IP stack when an IP packet
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* should be sent. It calls the function called low_level_output() to
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* do the actuall transmission of the packet.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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static err_t
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tunif_output(struct netif *netif, struct pbuf *p,
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struct ip_addr *ipaddr)
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{
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struct tunif *tunif;
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LWIP_UNUSED_ARG(ipaddr);
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tunif = netif->state;
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return low_level_output(tunif, p);
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* tunif_input():
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*
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* This function should be called when a packet is ready to be read
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* from the interface. It uses the function low_level_input() that
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* should handle the actual reception of bytes from the network
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* interface.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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static void
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tunif_input(struct netif *netif)
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{
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struct tunif *tunif;
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struct pbuf *p;
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tunif = netif->state;
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p = low_level_input(tunif);
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if (p == NULL) {
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LWIP_DEBUGF(TUNIF_DEBUG, ("tunif_input: low_level_input returned NULL\n"));
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return;
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}
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#if 0
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/* CS: ip_lookup() was removed */
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if (ip_lookup(p->payload, netif)) {
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#endif
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netif->input(p, netif);
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#if 0
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}
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#endif
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* tunif_init():
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*
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* Should be called at the beginning of the program to set up the
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* network interface. It calls the function low_level_init() to do the
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* actual setup of the hardware.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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err_t
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tunif_init(struct netif *netif)
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{
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struct tunif *tunif;
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tunif = mem_malloc(sizeof(struct tunif));
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if (!tunif)
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return ERR_MEM;
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netif->state = tunif;
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netif->name[0] = IFNAME0;
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netif->name[1] = IFNAME1;
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netif->output = tunif_output;
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low_level_init(netif);
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return ERR_OK;
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}
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/*-----------------------------------------------------------------------------------*/
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