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Comparing gvpe/src/device-linux.C (file contents):
Revision 1.2 by pcg, Sat Mar 8 10:48:41 2003 UTC vs.
Revision 1.18 by pcg, Thu Aug 7 17:54:26 2008 UTC

1/* 1/*
2 device-linux.C -- Interaction with Linux tun/tap device 2 device-linux.C -- Interaction with Linux tun/tap device
3 Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
3 4
5 This file is part of GVPE.
6
4 This program is free software; you can redistribute it and/or modify 7 GVPE is free software; you can redistribute it and/or modify it
5 it under the terms of the GNU General Public License as published by 8 under the terms of the GNU General Public License as published by the
6 the Free Software Foundation; either version 2 of the License, or 9 Free Software Foundation; either version 3 of the License, or (at your
7 (at your option) any later version. 10 option) any later version.
8 11
9 This program is distributed in the hope that it will be useful, 12 This program is distributed in the hope that it will be useful, but
10 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12 GNU General Public License for more details. 15 Public License for more details.
13 16
14 You should have received a copy of the GNU General Public License 17 You should have received a copy of the GNU General Public License along
15 along with this program; if not, write to the Free Software 18 with this program; if not, see <http://www.gnu.org/licenses/>.
16 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19
20 Additional permission under GNU GPL version 3 section 7
21
22 If you modify this Program, or any covered work, by linking or
23 combining it with the OpenSSL project's OpenSSL library (or a modified
24 version of that library), containing parts covered by the terms of the
25 OpenSSL or SSLeay licenses, the licensors of this Program grant you
26 additional permission to convey the resulting work. Corresponding
27 Source for a non-source form of such a combination shall include the
28 source code for the parts of OpenSSL used as well as that of the
29 covered work.
17*/ 30*/
18 31
19#include "config.h" 32#include "config.h"
20 33
21#include <cstdio> 34#include <cstdio>
… …
28#include <fcntl.h> 41#include <fcntl.h>
29#include <net/if.h> 42#include <net/if.h>
30#include <unistd.h> 43#include <unistd.h>
31#include <sys/ioctl.h> 44#include <sys/ioctl.h>
32 45
46#include <net/if.h>
47
33#ifdef LINUX_IF_TUN_H 48#ifdef LINUX_IF_TUN_H
34#include LINUX_IF_TUN_H 49# include LINUX_IF_TUN_H
35#else 50#else
36#include <linux/if_tun.h> 51#include <linux/if_tun.h>
37#endif 52#endif
38#define DEFAULT_DEVICE "/dev/net/tun" 53#define DEFAULT_DEVICE "/dev/net/tun"
39 54
40#include "gettext.h" 55#include "gettext.h"
41 56
42#include "conf.h" 57#include "conf.h"
43 58
59#if TEST_ETHEREMU
60# define IF_istun
61# include "ether_emu.C"
62#endif
63
64const char *
65tap_device::info ()
66{
67 return _("Linux tun/tap device");
68}
69
70const char *
71tap_device::if_up ()
72{
73 return "/sbin/ifconfig $IFNAME hw ether $MAC mtu $MTU";
74}
75
44tap_device::tap_device () 76tap_device::tap_device ()
45{ 77{
46 struct ifreq ifr; 78 struct ifreq ifr;
47 79
48 device = DEFAULT_DEVICE; 80 device = (char *)DEFAULT_DEVICE;
49 81
50 fd = open (device, O_RDWR); 82 fd = open (device, O_RDWR);
51 83
52 if (fd < 0) 84 if (fd < 0)
53 { 85 {
54 slog (L_ERR, _("could not open device %s: %s"), device, strerror (errno)); 86 slog (L_ERR, _("could not open device %s: %s"), device, strerror (errno));
55 exit (1); 87 exit (EXIT_FAILURE);
56 } 88 }
57 89
58 memset (&ifr, 0, sizeof (ifr)); 90 memset (&ifr, 0, sizeof (ifr));
91#if TEST_ETHEREMU
92 ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
93#else
59 ifr.ifr_flags = IFF_TAP | IFF_NO_PI; 94 ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
95#endif
60 96
61 if (conf.ifname) 97 if (conf.ifname)
62 strncpy (ifr.ifr_name, conf.ifname, IFNAMSIZ); 98 strncpy (ifr.ifr_name, conf.ifname, IFNAMSIZ);
63 else 99 else
64 ifr.ifr_name[0] = 0; 100 ifr.ifr_name[0] = 0;
… …
68 strncpy (ifrname, ifr.ifr_name, IFNAMSIZ); 104 strncpy (ifrname, ifr.ifr_name, IFNAMSIZ);
69 ifrname [IFNAMSIZ] = 0; 105 ifrname [IFNAMSIZ] = 0;
70 } 106 }
71 else 107 else
72 { 108 {
73 slog (L_CRIT, _("unable to configure tun/tap interface: %s"), strerror (errno)); 109 slog (L_CRIT, _("unable to configure tun/tap interface, exiting: %s"), strerror (errno));
74 exit (1); 110 exit (EXIT_FAILURE);
75 } 111 }
112
113#if 0
114 does not work
115 id2mac (THISNODE->id, &ifr.ifr_hwaddr.sa_data);
116 if (ioctl (fd, SIOCSIFHWADDR, &ifr))
117 {
118 slog (L_ERR, _("cannot set MAC address for device %s, exiting: %s"), ifrname, strerror (errno));
119 exit (EXIT_FAILURE);
120 }
121#endif
76 122
77 if (ioctl (fd, TUNSETPERSIST, conf.ifpersist ? 1 : 0)) 123 if (ioctl (fd, TUNSETPERSIST, conf.ifpersist ? 1 : 0))
78 slog (L_WARN, _("cannot set persistency mode for device %s: %s"), ifrname, strerror (errno)); 124 slog (L_WARN, _("cannot set persistency mode for device %s: %s"), ifrname, strerror (errno));
79 125
80 slog (L_DEBUG, _("%s is a %s"), device, info ()); 126 slog (L_DEBUG, _("%s is a %s"), device, info ());
… …
88tap_packet * 134tap_packet *
89tap_device::recv () 135tap_device::recv ()
90{ 136{
91 tap_packet *pkt = new tap_packet; 137 tap_packet *pkt = new tap_packet;
92 138
139#if TEST_ETHEREMU
140 pkt->len = read (fd, &((*pkt)[14]), MAX_MTU - 14);
141#else
93 pkt->len = read (fd, &((*pkt)[0]), MAX_MTU); 142 pkt->len = read (fd, &((*pkt)[0]), MAX_MTU);
143#endif
94 144
95 if (pkt->len <= 0) 145 if (pkt->len <= 0)
96 { 146 {
147 delete pkt;
97 slog (L_ERR, _("error while reading from %s %s: %s"), 148 slog (L_ERR, _("error while reading from %s %s: %s"),
98 info (), DEFAULT_DEVICE, strerror (errno)); 149 info (), DEFAULT_DEVICE, strerror (errno));
99 free (pkt);
100 return 0; 150 return 0;
101 } 151 }
152
153#if TEST_ETHEREMU
154 pkt->len += 14;
155
156 // assume ipv4
157 (*pkt)[12] = 0x08;
158 (*pkt)[13] = 0x00;
159
160 if (!ether_emu.tun_to_tap (pkt))
161 {
162 delete pkt;
163 return 0;
164 }
165#endif
102 166
103 return pkt; 167 return pkt;
104} 168}
105 169
106void 170void
107tap_device::send (tap_packet *pkt) 171tap_device::send (tap_packet *pkt)
108{ 172{
173#if TEST_ETHEREMU
174 if (ether_emu.tap_to_tun (pkt) &&
175 write (fd, &((*pkt)[14]), pkt->len - 14) < 0)
176#else
109 if (write (fd, &((*pkt)[0]), pkt->len) < 0) 177 if (write (fd, &((*pkt)[0]), pkt->len) < 0)
178#endif
110 slog (L_ERR, _("can't write to %s %s: %s"), info (), DEFAULT_DEVICE, 179 slog (L_ERR, _("can't write to %s %s: %s"), info (), DEFAULT_DEVICE,
111 strerror (errno)); 180 strerror (errno));
112} 181}
113 182

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