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Resync new repository with old repo r5166
git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
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patacongo
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/****************************************************************************
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* up_tapdev.c
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*
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* Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Based on code from uIP which also has a BSD-like license:
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*
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* Copyright (c) 2001, Adam Dunkels.
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __CYGWIN__
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/****************************************************************************
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* Included Files
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****************************************************************************/
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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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#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 <linux/if.h>
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#include <linux/if_tun.h>
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#include <linux/net.h>
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extern int lib_rawprintf(const char *format, ...);
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extern int uipdriver_setmacaddr(unsigned char *macaddr);
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/****************************************************************************
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* Private Definitions
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****************************************************************************/
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#define TAPDEV_DEBUG 1
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#define DEVTAP "/dev/net/tun"
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#ifndef CONFIG_EXAMPLE_UIP_DHCPC
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# define UIP_IPADDR0 192
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# define UIP_IPADDR1 168
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# define UIP_IPADDR2 0
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# define UIP_IPADDR3 128
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#else
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# define UIP_IPADDR0 0
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# define UIP_IPADDR1 0
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# define UIP_IPADDR2 0
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# define UIP_IPADDR3 0
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* Warning: This is very much Linux version specific! */
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struct sel_arg_struct
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{
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unsigned long n;
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fd_set *inp;
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fd_set *outp;
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fd_set *exp;
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struct timeval *tvp;
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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#ifdef TAPDEV_DEBUG
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static int gdrop = 0;
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#endif
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static int gtapdevfd;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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#ifdef TAPDEV_DEBUG
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static inline void dump_ethhdr(const char *msg, unsigned char *buf, int buflen)
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{
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lib_rawprintf("TAPDEV: %s %d bytes\n", msg, buflen);
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lib_rawprintf(" %02x:%02x:%02x:%02x:%02x:%02x %02x:%02x:%02x:%02x:%02x:%02x %02x%02x\n",
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buf[0], buf[1], buf[2], buf[3], buf[4], buf[5],
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buf[6], buf[7], buf[8], buf[9], buf[10], buf[11],
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#ifdef CONFIG_ENDIAN_BIG
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buf[13], buf[12]);
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#else
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buf[12], buf[13]);
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#endif
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}
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#else
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# define dump_ethhdr(m,b,l)
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#endif
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static int up_setmacaddr(void)
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{
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int sockfd;
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int ret = -1;
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/* Get a socket (only so that we get access to the INET subsystem) */
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sockfd = socket(PF_INET, SOCK_DGRAM, 0);
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if (sockfd >= 0)
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{
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struct ifreq req;
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memset(&req, 0, sizeof(struct ifreq));
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/* Put the driver name into the request */
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strncpy(req.ifr_name, "tap0", IFNAMSIZ);
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/* Perform the ioctl to get the MAC address */
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ret = ioctl(sockfd, SIOCGIFHWADDR, (unsigned long)&req);
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if (!ret)
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{
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/* Set the MAC address */
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ret = uipdriver_setmacaddr(&req.ifr_hwaddr.sa_data);
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}
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}
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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void tapdev_init(void)
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{
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struct ifreq ifr;
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char buf[1024];
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int ret;
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/* Open the tap device */
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gtapdevfd = open(DEVTAP, O_RDWR, 0644);
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if (gtapdevfd < 0)
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{
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lib_rawprintf("TAPDEV: open failed: %d\n", -gtapdevfd );
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return;
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}
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/* Configure the tap device */
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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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ret = ioctl(gtapdevfd, TUNSETIFF, (unsigned long) &ifr);
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if (ret < 0)
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{
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lib_rawprintf("TAPDEV: ioctl failed: %d\n", -ret );
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return;
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}
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/* Assign an IPv4 address to the tap device */
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snprintf(buf, sizeof(buf), "/sbin/ifconfig tap0 inet %d.%d.%d.%d\n",
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UIP_IPADDR0, UIP_IPADDR1, UIP_IPADDR2, UIP_IPADDR3);
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system(buf);
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/* Set the MAC address */
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up_setmacaddr();
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}
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unsigned int tapdev_read(unsigned char *buf, unsigned int buflen)
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{
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fd_set fdset;
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struct timeval tv;
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int ret;
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/* We can't do anything if we failed to open the tap device */
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if (gtapdevfd < 0)
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{
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return 0;
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}
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/* Wait for data on the tap device (or a timeout) */
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tv.tv_sec = 0;
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tv.tv_usec = 1000;
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FD_ZERO(&fdset);
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FD_SET(gtapdevfd, &fdset);
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ret = select(gtapdevfd + 1, &fdset, NULL, NULL, &tv);
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if(ret == 0)
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{
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return 0;
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}
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ret = read(gtapdevfd, buf, buflen);
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if (ret < 0)
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{
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lib_rawprintf("TAPDEV: read failed: %d\n", -ret);
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return 0;
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}
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dump_ethhdr("read", buf, ret);
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return ret;
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}
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void tapdev_send(unsigned char *buf, unsigned int buflen)
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{
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int ret;
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#ifdef TAPDEV_DEBUG
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lib_rawprintf("tapdev_send: sending %d bytes\n", buflen);
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gdrop++;
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if(gdrop % 8 == 7)
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{
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lib_rawprintf("Dropped a packet!\n");
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return;
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}
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#endif
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ret = write(gtapdevfd, buf, buflen);
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if (ret < 0)
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{
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lib_rawprintf("TAPDEV: write failed: %d", -ret);
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exit(1);
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}
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dump_ethhdr("write", buf, buflen);
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}
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#endif /* !__CYGWIN__ */
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