/*
device.c -- Interaction with Linux ethertap and tun/tap device
- Copyright (C) 2001-2002 Ivo Timmermans <ivo@o2w.nl>,
- 2001-2002 Guus Sliepen <guus@sliepen.eu.org>
+ Copyright (C) 2001-2005 Ivo Timmermans,
+ 2001-2012 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id: device.c,v 1.1.2.16 2003/07/06 22:11:35 guus Exp $
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#include "config.h"
-
-#include <stdio.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <net/if.h>
-#include <unistd.h>
-#include <string.h>
-#include <sys/ioctl.h>
-
-#ifdef HAVE_TUNTAP
-#ifdef LINUX_IF_TUN_H
-#include LINUX_IF_TUN_H
-#else
+#include "system.h"
+
+#ifdef HAVE_LINUX_IF_TUN_H
#include <linux/if_tun.h>
-#endif
#define DEFAULT_DEVICE "/dev/net/tun"
#else
#define DEFAULT_DEVICE "/dev/tap0"
#endif
-#include <utils.h>
#include "conf.h"
+#include "device.h"
+#include "logger.h"
#include "net.h"
#include "route.h"
-#include "logger.h"
+#include "utils.h"
+#include "xalloc.h"
-#include "system.h"
-
-enum {
+typedef enum device_type_t {
DEVICE_TYPE_ETHERTAP,
DEVICE_TYPE_TUN,
DEVICE_TYPE_TAP,
-};
+} device_type_t;
int device_fd = -1;
-int device_type;
-char *device;
-char *interface;
-char ifrname[IFNAMSIZ];
-char *device_info;
+static device_type_t device_type;
+char *device = NULL;
+char *iface = NULL;
+static char *type = NULL;
+static char ifrname[IFNAMSIZ];
+static char *device_info;
-int device_total_in = 0;
-int device_total_out = 0;
+static uint64_t device_total_in = 0;
+static uint64_t device_total_out = 0;
-/*
- open the local ethertap device
-*/
-int setup_device(void)
-{
+static bool setup_device(void) {
struct ifreq ifr;
-
- cp();
+ bool t1q = false;
if(!get_config_string(lookup_config(config_tree, "Device"), &device))
- device = DEFAULT_DEVICE;
+ device = xstrdup(DEFAULT_DEVICE);
- if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
-#ifdef HAVE_TUNTAP
- interface = netname;
+ if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
+#ifdef HAVE_LINUX_IF_TUN_H
+ if (netname != NULL)
+ iface = xstrdup(netname);
#else
- interface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
+ iface = xstrdup(strrchr(device, '/') ? strrchr(device, '/') + 1 : device);
#endif
device_fd = open(device, O_RDWR | O_NONBLOCK);
if(device_fd < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
- return -1;
+ logger(LOG_ERR, "Could not open %s: %s", device, strerror(errno));
+ return false;
}
-#ifdef HAVE_TUNTAP
+#ifdef FD_CLOEXEC
+ fcntl(device_fd, F_SETFD, FD_CLOEXEC);
+#endif
+
+#ifdef HAVE_LINUX_IF_TUN_H
/* Ok now check if this is an old ethertap or a new tun/tap thingie */
memset(&ifr, 0, sizeof(ifr));
- if(routing_mode == RMODE_ROUTER) {
+
+ get_config_string(lookup_config(config_tree, "DeviceType"), &type);
+
+ if(type && strcasecmp(type, "tun") && strcasecmp(type, "tap")) {
+ logger(LOG_ERR, "Unknown device type %s!", type);
+ return false;
+ }
+
+ if((type && !strcasecmp(type, "tun")) || (!type && routing_mode == RMODE_ROUTER)) {
ifr.ifr_flags = IFF_TUN;
device_type = DEVICE_TYPE_TUN;
- device_info = _("Linux tun/tap device (tun mode)");
+ device_info = "Linux tun/tap device (tun mode)";
} else {
+ if (routing_mode == RMODE_ROUTER)
+ overwrite_mac = true;
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
device_type = DEVICE_TYPE_TAP;
- device_info = _("Linux tun/tap device (tap mode)");
+ device_info = "Linux tun/tap device (tap mode)";
}
- if(interface)
- strncpy(ifr.ifr_name, interface, IFNAMSIZ);
+#ifdef IFF_ONE_QUEUE
+ /* Set IFF_ONE_QUEUE flag... */
+ if(get_config_bool(lookup_config(config_tree, "IffOneQueue"), &t1q) && t1q)
+ ifr.ifr_flags |= IFF_ONE_QUEUE;
+#endif
+
+ if(iface)
+ strncpy(ifr.ifr_name, iface, IFNAMSIZ);
- if(!ioctl(device_fd, TUNSETIFF, (void *) &ifr)) {
+ if(!ioctl(device_fd, TUNSETIFF, &ifr)) {
strncpy(ifrname, ifr.ifr_name, IFNAMSIZ);
- interface = ifrname;
- } else if(!ioctl(device_fd, (('T' << 8) | 202), (void *) &ifr)) {
- logger(DEBUG_ALWAYS, LOG_WARNING, _("Old ioctl() request was needed for %s"), device);
+ if(iface) free(iface);
+ iface = xstrdup(ifrname);
+ } else if(!ioctl(device_fd, (('T' << 8) | 202), &ifr)) {
+ logger(LOG_WARNING, "Old ioctl() request was needed for %s", device);
strncpy(ifrname, ifr.ifr_name, IFNAMSIZ);
- interface = ifrname;
+ if(iface) free(iface);
+ iface = xstrdup(ifrname);
} else
#endif
{
if(routing_mode == RMODE_ROUTER)
- overwrite_mac = 1;
- device_info = _("Linux ethertap device");
+ overwrite_mac = true;
+ device_info = "Linux ethertap device";
device_type = DEVICE_TYPE_ETHERTAP;
- interface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
+ if(iface)
+ free(iface);
+ iface = xstrdup(strrchr(device, '/') ? strrchr(device, '/') + 1 : device);
}
- logger(DEBUG_ALWAYS, LOG_INFO, _("%s is a %s"), device, device_info);
+ logger(LOG_INFO, "%s is a %s", device, device_info);
- return 0;
+ return true;
}
-void close_device(void)
-{
- cp();
-
+static void close_device(void) {
close(device_fd);
+
+ free(type);
+ free(device);
+ free(iface);
}
-/*
- read, encrypt and send data that is
- available through the ethertap device
-*/
-int read_packet(vpn_packet_t *packet)
-{
+static bool read_packet(vpn_packet_t *packet) {
int lenin;
- cp();
-
switch(device_type) {
case DEVICE_TYPE_TUN:
lenin = read(device_fd, packet->data + 10, MTU - 10);
if(lenin <= 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Error while reading from %s %s: %s"),
+ logger(LOG_ERR, "Error while reading from %s %s: %s",
device_info, device, strerror(errno));
- return -1;
+ return false;
}
+ memset(packet->data, 0, 12);
packet->len = lenin + 10;
break;
case DEVICE_TYPE_TAP:
lenin = read(device_fd, packet->data, MTU);
if(lenin <= 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Error while reading from %s %s: %s"),
+ logger(LOG_ERR, "Error while reading from %s %s: %s",
device_info, device, strerror(errno));
- return -1;
+ return false;
}
packet->len = lenin;
lenin = read(device_fd, packet->data - 2, MTU + 2);
if(lenin <= 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Error while reading from %s %s: %s"),
+ logger(LOG_ERR, "Error while reading from %s %s: %s",
device_info, device, strerror(errno));
- return -1;
+ return false;
}
packet->len = lenin - 2;
device_total_in += packet->len;
- logger(DEBUG_TRAFFIC, LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
device_info);
- return 0;
+ return true;
}
-int write_packet(vpn_packet_t *packet)
-{
- cp();
-
- logger(DEBUG_TRAFFIC, LOG_DEBUG, _("Writing packet of %d bytes to %s"),
+static bool write_packet(vpn_packet_t *packet) {
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
packet->len, device_info);
switch(device_type) {
case DEVICE_TYPE_TUN:
packet->data[10] = packet->data[11] = 0;
if(write(device_fd, packet->data + 10, packet->len - 10) < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
+ logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device,
strerror(errno));
- return -1;
+ return false;
}
break;
case DEVICE_TYPE_TAP:
if(write(device_fd, packet->data, packet->len) < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
+ logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device,
strerror(errno));
- return -1;
+ return false;
}
break;
case DEVICE_TYPE_ETHERTAP:
- *(short int *)(packet->data - 2) = packet->len;
+ memcpy(packet->data - 2, &packet->len, 2);
if(write(device_fd, packet->data - 2, packet->len + 2) < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
+ logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device,
strerror(errno));
- return -1;
+ return false;
}
break;
}
device_total_out += packet->len;
- return 0;
+ return true;
}
-void dump_device_stats(void)
-{
- cp();
-
- logger(DEBUG_ALWAYS, LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
- logger(DEBUG_ALWAYS, LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
- logger(DEBUG_ALWAYS, LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
+static void dump_device_stats(void) {
+ logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
+ logger(LOG_DEBUG, " total bytes in: %10"PRIu64, device_total_in);
+ logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
}
+
+const devops_t os_devops = {
+ .setup = setup_device,
+ .close = close_device,
+ .read = read_packet,
+ .write = write_packet,
+ .dump_stats = dump_device_stats,
+};
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