tun.c revision 46086 
1/*-
2 * Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 *	$Id: tun.c,v 1.12 1999/04/26 08:54:25 brian Exp $
27 */
28
29#include <sys/param.h>
30#include <sys/socket.h>		/* For IFF_ defines */
31#include <net/if.h>		/* For IFF_ defines */
32#include <netinet/in.h>
33#include <net/if_types.h>
34#include <net/if_tun.h>
35#include <netinet/in_systm.h>
36#include <netinet/ip.h>
37#include <sys/un.h>
38
39#include <errno.h>
40#include <string.h>
41#include <sys/ioctl.h>
42#ifdef __NetBSD__
43#include <stdio.h>
44#include <unistd.h>
45#endif
46
47#include "mbuf.h"
48#include "log.h"
49#include "timer.h"
50#include "lqr.h"
51#include "hdlc.h"
52#include "defs.h"
53#include "fsm.h"
54#include "throughput.h"
55#include "iplist.h"
56#include "slcompress.h"
57#include "ipcp.h"
58#include "filter.h"
59#include "descriptor.h"
60#include "lcp.h"
61#include "ccp.h"
62#include "link.h"
63#include "mp.h"
64#ifndef NORADIUS
65#include "radius.h"
66#endif
67#include "bundle.h"
68#include "tun.h"
69
70void
71tun_configure(struct bundle *bundle, int mtu)
72{
73#ifdef __NetBSD__
74  struct ifreq ifr;
75  int s;
76
77  s = socket(AF_INET, SOCK_DGRAM, 0);
78
79  if (s < 0) {
80    log_Printf(LogERROR, "tun_configure: socket(): %s\n", strerror(errno));
81    return;
82  }
83
84  sprintf(ifr.ifr_name, "tun%d", bundle->unit);
85  ifr.ifr_mtu = mtu;
86  if (ioctl(s, SIOCSIFMTU, &ifr) < 0)
87      log_Printf(LogERROR, "tun_configure: ioctl(SIOCSIFMTU): %s\n",
88             strerror(errno));
89
90  close(s);
91#else
92  struct tuninfo info;
93
94  memset(&info, '\0', sizeof info);
95  info.type = IFT_PPP;
96#ifndef NORADIUS
97  if (bundle->radius.valid && bundle->radius.mtu && bundle->radius.mtu < mtu) {
98    log_Printf(LogLCP, "Reducing MTU to radius value %lu\n",
99               bundle->radius.mtu);
100    info.mtu = bundle->radius.mtu;
101  } else
102#endif
103    info.mtu = mtu;
104
105  info.baudrate = bundle->ifSpeed;
106#ifdef __OpenBSD__
107  info.flags = IFF_UP|IFF_POINTOPOINT;
108#endif
109  if (ioctl(bundle->dev.fd, TUNSIFINFO, &info) < 0)
110    log_Printf(LogERROR, "tun_configure: ioctl(TUNSIFINFO): %s\n",
111	      strerror(errno));
112#endif
113}
114