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354
proj/minimal/mintapif.c
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354
proj/minimal/mintapif.c
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/*-----------------------------------------------------------------------------------*/
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/*
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* Copyright (c) 2001, 2002 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 <unistd.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/uio.h>
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#include <sys/socket.h>
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#ifdef linux
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#include <sys/ioctl.h>
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#include <linux/if.h>
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#include <linux/if_tun.h>
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#define DEVTAP "/dev/net/tun"
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#else /* linux */
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#define DEVTAP "/dev/tap0"
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#endif /* linux */
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#include "lwip/stats.h"
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#include "lwip/mem.h"
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#include "netif/etharp.h"
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#include "mintapif.h"
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/* Define those to better describe your network interface. */
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#define IFNAME0 'e'
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#define IFNAME1 't'
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struct mintapif {
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struct eth_addr *ethaddr;
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/* Add whatever per-interface state that is needed here. */
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u32_t lasttime;
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int fd;
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};
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static const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
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/* Forward declarations. */
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static void mintapif_input(struct netif *netif);
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static err_t mintapif_output(struct netif *netif, struct pbuf *p,
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struct ip_addr *ipaddr);
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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 mintapif *mintapif;
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char buf[1024];
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mintapif = netif->state;
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/* Obtain MAC address from network interface. */
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mintapif->ethaddr->addr[0] = 1;
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mintapif->ethaddr->addr[1] = 2;
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mintapif->ethaddr->addr[2] = 3;
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mintapif->ethaddr->addr[3] = 4;
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mintapif->ethaddr->addr[4] = 5;
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mintapif->ethaddr->addr[5] = 6;
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/* Do whatever else is needed to initialize interface. */
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mintapif->fd = open(DEVTAP, O_RDWR);
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if(mintapif->fd == -1) {
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perror("tapif: tapif_init: open");
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exit(1);
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}
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#ifdef linux
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{
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
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if (ioctl(mintapif->fd, TUNSETIFF, (void *) &ifr) < 0) {
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perror(buf);
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exit(1);
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}
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}
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#endif /* Linux */
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snprintf(buf, sizeof(buf), "ifconfig tap0 inet %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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system(buf);
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mintapif->lasttime = 0;
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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 netif *netif, struct pbuf *p)
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{
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struct mintapif *mintapif;
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struct pbuf *q;
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char buf[1500];
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char *bufptr;
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mintapif = netif->state;
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/* initiate transfer(); */
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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(mintapif->fd, buf, p->tot_len) == -1) {
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perror("tapif: 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 mintapif *mintapif)
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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(mintapif->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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avaliable 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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printf("Could not allocate pbufs\n");
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}
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return p;
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* mintapif_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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mintapif_output(struct netif *netif, struct pbuf *p,
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struct ip_addr *ipaddr)
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{
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p = etharp_output(netif, ipaddr, p);
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if(p != NULL) {
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return low_level_output(netif, p);
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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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* mintapif_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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mintapif_input(struct netif *netif)
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{
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struct mintapif *mintapif;
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struct eth_hdr *ethhdr;
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struct pbuf *p, *q;
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mintapif = netif->state;
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p = low_level_input(mintapif);
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if(p != NULL) {
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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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ethhdr = p->payload;
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q = NULL;
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switch(htons(ethhdr->type)) {
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case ETHTYPE_IP:
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q = etharp_ip_input(netif, p);
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pbuf_header(p, -14);
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netif->input(p, netif);
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break;
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case ETHTYPE_ARP:
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q = etharp_arp_input(netif, mintapif->ethaddr, p);
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break;
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default:
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pbuf_free(p);
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break;
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}
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if(q != NULL) {
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low_level_output(netif, q);
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pbuf_free(q);
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}
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}
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* mintapif_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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void
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mintapif_init(struct netif *netif)
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{
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struct mintapif *mintapif;
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mintapif = mem_malloc(sizeof(struct mintapif));
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netif->state = mintapif;
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netif->name[0] = IFNAME0;
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netif->name[1] = IFNAME1;
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netif->output = mintapif_output;
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netif->linkoutput = low_level_output;
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mintapif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);
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low_level_init(netif);
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}
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/*-----------------------------------------------------------------------------------*/
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enum mintapif_signal
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mintapif_wait(struct netif *netif, u16_t time)
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{
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fd_set fdset;
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struct timeval tv, now;
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struct timezone tz;
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int ret;
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struct mintapif *mintapif;
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mintapif = netif->state;
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while(1) {
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if(mintapif->lasttime >= (u32_t)time * 1000) {
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mintapif->lasttime = 0;
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return MINTAPIF_TIMEOUT;
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}
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tv.tv_sec = 0;
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tv.tv_usec = (u32_t)time * 1000 - mintapif->lasttime;
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FD_ZERO(&fdset);
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FD_SET(mintapif->fd, &fdset);
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gettimeofday(&now, &tz);
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ret = select(mintapif->fd + 1, &fdset, NULL, NULL, &tv);
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if(ret == 0) {
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mintapif->lasttime = 0;
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return MINTAPIF_TIMEOUT;
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}
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gettimeofday(&tv, &tz);
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mintapif->lasttime += (tv.tv_sec - now.tv_sec) * 1000000 + (tv.tv_usec - now.tv_usec);
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mintapif_input(netif);
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}
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return MINTAPIF_PACKET;
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}
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