mirror of
https://github.com/ep00ch/lwip-contrib-mac.git
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347 lines
9.4 KiB
C
347 lines
9.4 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/pbuf.h"
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#include "lwip/sys.h"
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#include "netif/etharp.h"
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#if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP)
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#include "netif/tcpdump.h"
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#endif /* LWIP_DEBUG && LWIP_TCPDUMP */
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#if defined(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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#define IFCONFIG_ARGS "tap0 inet %d.%d.%d.%d"
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#elif defined(openbsd)
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#define DEVTAP "/dev/tun0"
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#define IFCONFIG_ARGS "tun0 inet %d.%d.%d.%d link0"
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#else /* others */
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#define DEVTAP "/dev/tap0"
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#define IFCONFIG_ARGS "tap0 inet %d.%d.%d.%d"
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#endif
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#define IFNAME0 't'
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#define IFNAME1 'p'
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struct tapif {
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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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int fd;
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};
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/* Forward declarations. */
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static void tapif_input(struct netif *netif);
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static void tapif_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 tapif *tapif;
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char buf[100];
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tapif = netif->state;
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/* Obtain MAC address from network interface. */
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/* (We just fake an address...) */
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tapif->ethaddr->addr[0] = 0x1;
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tapif->ethaddr->addr[1] = 0x2;
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tapif->ethaddr->addr[2] = 0x3;
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tapif->ethaddr->addr[3] = 0x4;
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tapif->ethaddr->addr[4] = 0x5;
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tapif->ethaddr->addr[5] = 0x6;
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/* Do whatever else is needed to initialize interface. */
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tapif->fd = open(DEVTAP, O_RDWR);
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LWIP_DEBUGF(TAPIF_DEBUG, ("tapif_init: fd %d\n", tapif->fd));
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if(tapif->fd == -1) {
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#ifdef linux
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perror("tapif_init: try running \"modprobe tun\" or rebuilding your kernel with CONFIG_TUN; cannot open "DEVTAP);
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#else
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perror("tapif_init: cannot open "DEVTAP);
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#endif
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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(tapif->fd, TUNSETIFF, (void *) &ifr) < 0) {
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perror("tapif_init: "DEVTAP" ioctl TUNSETIFF");
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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), "/sbin/ifconfig " IFCONFIG_ARGS,
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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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LWIP_DEBUGF(TAPIF_DEBUG, ("tapif_init: system(\"%s\");\n", buf));
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system(buf);
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sys_thread_new("tapif_thread", tapif_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 netif *netif, struct pbuf *p)
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{
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struct pbuf *q;
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char buf[1514];
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char *bufptr;
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struct tapif *tapif;
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tapif = netif->state;
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#if 0
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if(((double)rand()/(double)RAND_MAX) < 0.2) {
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printf("drop output\n");
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return ERR_OK;
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}
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#endif
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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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memcpy(bufptr, q->payload, 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(tapif->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 tapif *tapif)
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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[1514];
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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(tapif->fd, buf, sizeof(buf));
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#if 0
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if(((double)rand()/(double)RAND_MAX) < 0.2) {
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printf("drop\n");
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return NULL;
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}
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#endif
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/* We allocate a pbuf chain of pbufs from the pool. */
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p = pbuf_alloc(PBUF_RAW, 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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memcpy(q->payload, bufptr, 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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tapif_thread(void *arg)
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{
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struct netif *netif;
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struct tapif *tapif;
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fd_set fdset;
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int ret;
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netif = arg;
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tapif = netif->state;
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while(1) {
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FD_ZERO(&fdset);
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FD_SET(tapif->fd, &fdset);
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/* Wait for a packet to arrive. */
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ret = select(tapif->fd + 1, &fdset, NULL, NULL, NULL);
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if(ret == 1) {
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/* Handle incoming packet. */
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tapif_input(netif);
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} else if(ret == -1) {
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perror("tapif_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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* tapif_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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tapif_input(struct netif *netif)
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{
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struct tapif *tapif;
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struct eth_hdr *ethhdr;
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struct pbuf *p;
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tapif = netif->state;
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p = low_level_input(tapif);
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if(p == NULL) {
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LWIP_DEBUGF(TAPIF_DEBUG, ("tapif_input: low_level_input returned NULL\n"));
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return;
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}
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ethhdr = p->payload;
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switch(htons(ethhdr->type)) {
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case ETHTYPE_IP:
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LWIP_DEBUGF(TAPIF_DEBUG, ("tapif_input: IP packet\n"));
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#if 0
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/* CSi disabled ARP table update on ingress IP packets.
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This seems to work but needs thorough testing. */
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etharp_ip_input(netif, p);
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#endif
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pbuf_header(p, -14);
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#if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP)
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tcpdump(p);
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#endif /* LWIP_DEBUG && LWIP_TCPDUMP */
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netif->input(p, netif);
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break;
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case ETHTYPE_ARP:
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LWIP_DEBUGF(TAPIF_DEBUG, ("tapif_input: ARP packet\n"));
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etharp_arp_input(netif, tapif->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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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* tapif_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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tapif_init(struct netif *netif)
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{
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struct tapif *tapif;
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tapif = mem_malloc(sizeof(struct tapif));
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if (!tapif)
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return ERR_MEM;
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netif->state = tapif;
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netif->name[0] = IFNAME0;
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netif->name[1] = IFNAME1;
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netif->output = etharp_output;
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netif->linkoutput = low_level_output;
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netif->mtu = 1500;
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/* hardware address length */
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netif->hwaddr_len = 6;
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tapif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);
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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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