423 lines
11 KiB
C
423 lines
11 KiB
C
/*
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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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*
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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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*
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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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*
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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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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#include "net/ip/uip.h"
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#include "net/ip/uipopt.h"
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#if NETSTACK_CONF_WITH_IPV6
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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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#ifdef __APPLE__
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/nd6.h> // ND6_INFINITE_LIFETIME
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/errno.h>
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#include <net/if_dl.h> // struct sockaddr_dl
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#include <net/route.h> // AF_ROUTE things
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#endif
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#include "tapdev6.h"
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#include "contiki-net.h"
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#define DROP 0
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#if DROP
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static int drop = 0;
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#endif
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static int fd = -1;
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static unsigned long lasttime;
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#define BUF ((struct uip_eth_hdr *)&uip_buf[0])
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#define IPBUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
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#define DEBUG 0
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#if DEBUG
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#define PRINTF(...) printf(__VA_ARGS__)
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#define PRINT6ADDR(addr) PRINTF("%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x", ((uint8_t *)addr)[0], ((uint8_t *)addr)[1], ((uint8_t *)addr)[2], ((uint8_t *)addr)[3], ((uint8_t *)addr)[4], ((uint8_t *)addr)[5], ((uint8_t *)addr)[6], ((uint8_t *)addr)[7], ((uint8_t *)addr)[8], ((uint8_t *)addr)[9], ((uint8_t *)addr)[10], ((uint8_t *)addr)[11], ((uint8_t *)addr)[12], ((uint8_t *)addr)[13], ((uint8_t *)addr)[14], ((uint8_t *)addr)[15])
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#else
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#define PRINTF(...)
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#define PRINT6ADDR(addr)
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#endif
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static void do_send(void);
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uint8_t tapdev_send(const uip_lladdr_t *lladdr);
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/*---------------------------------------------------------------------------*/
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int
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tapdev_fd(void)
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{
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return fd;
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}
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uint16_t
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tapdev_poll(void)
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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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tv.tv_sec = 0;
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tv.tv_usec = 0;
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FD_ZERO(&fdset);
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if(fd > 0) {
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FD_SET(fd, &fdset);
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}
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ret = select(fd + 1, &fdset, NULL, NULL, &tv);
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if(ret == 0) {
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return 0;
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}
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ret = read(fd, uip_buf, UIP_BUFSIZE);
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PRINTF("tapdev6: read %d bytes (max %d)\n", ret, UIP_BUFSIZE);
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if(ret == -1) {
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perror("tapdev_poll: read");
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}
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return ret;
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}
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/*---------------------------------------------------------------------------*/
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#if defined(__APPLE__)
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static int reqfd = -1, sfd = -1, interface_index;
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static void
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tapdev_init_darwin_routes(void)
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{
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struct stat st;
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if(-1 == fstat(fd, &st)) {
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perror("tapdev: fstat failed.");
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exit(EXIT_FAILURE);
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}
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/************* Add address *************/
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struct in6_aliasreq addreq6 = { };
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reqfd = socket(AF_INET6, SOCK_DGRAM, 0);
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if(-1 == fcntl(reqfd, F_SETFD, FD_CLOEXEC)) {
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perror("tapdev: fcntl failed.");
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exit(EXIT_FAILURE);
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}
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devname_r(st.st_rdev, S_IFCHR, addreq6.ifra_name,
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sizeof(addreq6.ifra_name));
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addreq6.ifra_addr.sin6_family = AF_INET6;
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addreq6.ifra_addr.sin6_len = sizeof(addreq6.ifra_addr);
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addreq6.ifra_addr.sin6_addr.__u6_addr.__u6_addr16[0] = UIP_HTONS(0xAAAA);
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addreq6.ifra_addr.sin6_addr.__u6_addr.__u6_addr16[7] = UIP_HTONS(0x0001);
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addreq6.ifra_prefixmask.sin6_family = AF_INET6;
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addreq6.ifra_prefixmask.sin6_len = sizeof(addreq6.ifra_prefixmask);
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addreq6.ifra_prefixmask.sin6_addr.__u6_addr.__u6_addr16[0] =
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UIP_HTONS(0xFFFF);
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addreq6.ifra_prefixmask.sin6_addr.__u6_addr.__u6_addr16[1] =
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UIP_HTONS(0xFFFF);
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addreq6.ifra_prefixmask.sin6_addr.__u6_addr.__u6_addr16[2] =
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UIP_HTONS(0xFFFF);
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addreq6.ifra_prefixmask.sin6_addr.__u6_addr.__u6_addr16[3] =
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UIP_HTONS(0xFFFF);
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addreq6.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
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addreq6.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
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addreq6.ifra_lifetime.ia6t_expire = ND6_INFINITE_LIFETIME;
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addreq6.ifra_lifetime.ia6t_preferred = ND6_INFINITE_LIFETIME;
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if(-1 == ioctl(reqfd, SIOCAIFADDR_IN6, &addreq6)) {
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perror("tapdev: Uable to add address, call to ioctl failed.");
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exit(EXIT_FAILURE);
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}
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/************* Add route *************/
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int s = socket(AF_ROUTE, SOCK_RAW, AF_INET6);
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if(s == -1) {
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perror("tapdev: Unable to add route, call to socket() failed.");
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// Failing to add the route is not fatal, so just return.
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return;
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}
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sfd = s;
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interface_index = if_nametoindex(devname(st.st_rdev, S_IFCHR));
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PRINTF("tapdev: if_nametoindex(devname(st.st_rdev, S_IFCHR)) = %d\n",
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interface_index);
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PRINTF("tapdev: devname(st.st_rdev, S_IFCHR) = %s\n",
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devname(st.st_rdev, S_IFCHR));
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struct {
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struct rt_msghdr hdr;
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struct sockaddr_in6 dst;
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struct sockaddr_dl gw;
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struct sockaddr_in6 mask;
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} msg = {};
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msg.hdr.rtm_msglen = sizeof(msg);
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msg.hdr.rtm_version = RTM_VERSION;
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msg.hdr.rtm_type = RTM_ADD;
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msg.hdr.rtm_index = interface_index;
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msg.hdr.rtm_flags = RTF_UP | RTF_STATIC;
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msg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
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msg.hdr.rtm_pid = getpid();
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msg.hdr.rtm_seq = 0;
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msg.dst.sin6_family = AF_INET6;
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msg.dst.sin6_len = sizeof(msg.dst);
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msg.dst.sin6_addr.__u6_addr.__u6_addr16[0] = UIP_HTONS(0xAAAA);
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msg.gw.sdl_family = AF_LINK;
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msg.gw.sdl_len = sizeof(msg.gw);
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msg.gw.sdl_index = interface_index;
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msg.mask.sin6_family = AF_INET6;
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msg.mask.sin6_len = sizeof(msg.mask);
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msg.mask.sin6_addr.__u6_addr.__u6_addr16[0] = UIP_HTONS(0xFFFF);
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msg.mask.sin6_addr.__u6_addr.__u6_addr16[1] = UIP_HTONS(0xFFFF);
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msg.mask.sin6_addr.__u6_addr.__u6_addr16[2] = UIP_HTONS(0xFFFF);
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msg.mask.sin6_addr.__u6_addr.__u6_addr16[3] = UIP_HTONS(0xFFFF);
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if(-1 == write(s, &msg, sizeof(msg))) {
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perror("tapdev: Unable to add route, call to write() failed.");
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// Failing to add the route is not fatal, so just return.
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return;
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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tapdev_cleanup_darwin_routes(void)
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{
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struct {
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struct rt_msghdr hdr;
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struct sockaddr_in6 dst;
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struct sockaddr_dl gw;
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struct sockaddr_in6 mask;
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} msg = {};
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msg.hdr.rtm_msglen = sizeof(msg);
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msg.hdr.rtm_version = RTM_VERSION;
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msg.hdr.rtm_type = RTM_DELETE;
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msg.hdr.rtm_index = interface_index;
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msg.hdr.rtm_flags = RTF_UP | RTF_STATIC;
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msg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
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msg.hdr.rtm_pid = getpid();
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msg.hdr.rtm_seq = 0;
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msg.dst.sin6_family = AF_INET6;
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msg.dst.sin6_len = sizeof(msg.dst);
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msg.dst.sin6_addr.__u6_addr.__u6_addr16[0] = UIP_HTONS(0xAAAA);
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msg.gw.sdl_family = AF_LINK;
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msg.gw.sdl_len = sizeof(msg.gw);
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msg.gw.sdl_index = interface_index;
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msg.mask.sin6_family = AF_INET6;
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msg.mask.sin6_len = sizeof(msg.mask);
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msg.mask.sin6_addr.__u6_addr.__u6_addr16[0] = UIP_HTONS(0xFFFF);
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msg.mask.sin6_addr.__u6_addr.__u6_addr16[1] = UIP_HTONS(0xFFFF);
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msg.mask.sin6_addr.__u6_addr.__u6_addr16[2] = UIP_HTONS(0xFFFF);
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msg.mask.sin6_addr.__u6_addr.__u6_addr16[3] = UIP_HTONS(0xFFFF);
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if(-1 == write(sfd, &msg, sizeof(msg))) {
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perror("tapdev: Unable to delete route");
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exit(EXIT_FAILURE);
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}
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close(reqfd);
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close(sfd);
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}
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#endif // defined(__APPLE__)
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/*---------------------------------------------------------------------------*/
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void
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tapdev_init(void)
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{
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char buf[1024];
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fd = open(DEVTAP, O_RDWR);
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if(fd == -1) {
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perror("tapdev: tapdev_init: open");
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return;
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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(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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#ifdef __APPLE__
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tapdev_init_darwin_routes();
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#endif
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/* Linux (ubuntu)
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snprintf(buf, sizeof(buf), "ip link set tap0 up");
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system(buf);
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PRINTF("%s\n", buf);
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snprintf(buf, sizeof(buf), "ip -6 address add fc00::231/7 dev tap0");
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system(buf);
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PRINTF("%s\n", buf);
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snprintf(buf, sizeof(buf), "ip -6 route add fc00::0/7 dev tap0");
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system(buf);
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PRINTF("%s\n", buf);
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*/
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/* freebsd */
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snprintf(buf, sizeof(buf), "ifconfig tap0 up");
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system(buf);
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printf("%s\n", buf);
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/* */
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lasttime = 0;
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/* gdk_input_add(fd, GDK_INPUT_READ,
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read_callback, NULL);*/
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atexit(&tapdev_exit);
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}
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/*---------------------------------------------------------------------------*/
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static void
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do_send(void)
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{
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int ret;
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if(fd <= 0) {
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return;
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}
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PRINTF("tapdev_send: sending %d bytes\n", uip_len);
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/* check_checksum(uip_buf, size);*/
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#if DROP
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drop++;
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if(drop % 8 == 7) {
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PRINTF("Dropped an output packet!\n");
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return;
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}
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#endif /* DROP */
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ret = write(fd, uip_buf, uip_len);
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if(ret == -1) {
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perror("tap_dev: tapdev_send: writev");
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exit(1);
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}
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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tapdev_send(const uip_lladdr_t *lladdr)
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{
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/*
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* If L3 dest is multicast, build L2 multicast address
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* as per RFC 2464 section 7
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* else fill with th eaddrsess in argument
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*/
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if(lladdr == NULL) {
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/* the dest must be multicast */
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(&BUF->dest)->addr[0] = 0x33;
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(&BUF->dest)->addr[1] = 0x33;
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(&BUF->dest)->addr[2] = IPBUF->destipaddr.u8[12];
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(&BUF->dest)->addr[3] = IPBUF->destipaddr.u8[13];
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(&BUF->dest)->addr[4] = IPBUF->destipaddr.u8[14];
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(&BUF->dest)->addr[5] = IPBUF->destipaddr.u8[15];
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} else {
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memcpy(&BUF->dest, lladdr, UIP_LLADDR_LEN);
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}
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memcpy(&BUF->src, &uip_lladdr, UIP_LLADDR_LEN);
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BUF->type = UIP_HTONS(UIP_ETHTYPE_IPV6); //math tmp
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uip_len += sizeof(struct uip_eth_hdr);
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do_send();
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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void
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tapdev_do_send(void)
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{
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do_send();
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}
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/*---------------------------------------------------------------------------*/
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// math added function
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void
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tapdev_exit(void)
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{
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PRINTF("tapdev: Closing...\n");
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#ifdef __APPLE__
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tapdev_cleanup_darwin_routes();
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#endif
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close(fd);
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}
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/*---------------------------------------------------------------------------*/
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#endif /* NETSTACK_CONF_WITH_IPV6 */
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