If we have a Linux tun/tap device and we are in router mode, open the device

[tinc] / src / linux / device.c

diff --git a/src/linux/device.c b/src/linux/device.c
index 629b49e..c5c8bcd 100644 (file)
--- a/src/linux/device.c
+++ b/src/linux/device.c
@@ -17,7 +17,7 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id: device.c,v 1.1.2.13 2002/09/15 22:19:19 guus Exp $
+    $Id: device.c,v 1.1.2.14 2003/06/11 19:09:52 guus Exp $
 */
 
 #include "config.h"
@@ -48,11 +48,15 @@
 #include "conf.h"
 #include "net.h"
 #include "subnet.h"
+#include "route.h"
 
 #include "system.h"
 
-#define DEVICE_TYPE_ETHERTAP 0
-#define DEVICE_TYPE_TUNTAP 1
+enum {
+       DEVICE_TYPE_ETHERTAP,
+       DEVICE_TYPE_TUN,
+       DEVICE_TYPE_TAP,
+};
 
 int device_fd = -1;
 int device_type;
@@ -104,20 +108,24 @@ int setup_device(void)
        /* Ok now check if this is an old ethertap or a new tun/tap thingie */
 
        memset(&ifr, 0, sizeof(ifr));
-       ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+       if(routing_mode == RMODE_ROUTER) {
+               ifr.ifr_flags = IFF_TUN;
+               device_type = DEVICE_TYPE_TUN;
+               device_info = _("Linux tun/tap device (tun mode)");
+       } else {
+               ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+               device_type = DEVICE_TYPE_TAP;
+               device_info = _("Linux tun/tap device (tap mode)");
+       }
 
        if(interface)
                strncpy(ifr.ifr_name, interface, IFNAMSIZ);
 
        if(!ioctl(device_fd, TUNSETIFF, (void *) &ifr)) {
-               device_info = _("Linux tun/tap device");
-               device_type = DEVICE_TYPE_TUNTAP;
                strncpy(ifrname, ifr.ifr_name, IFNAMSIZ);
                interface = ifrname;
        } else if(!ioctl(device_fd, (('T' << 8) | 202), (void *) &ifr)) {
                syslog(LOG_WARNING, _("Old ioctl() request was needed for %s"), device);
-               device_type = DEVICE_TYPE_TUNTAP;
-               device_info = _("Linux tun/tap device");
                strncpy(ifrname, ifr.ifr_name, IFNAMSIZ);
                interface = ifrname;
        } else
@@ -150,27 +158,40 @@ int read_packet(vpn_packet_t *packet)
        
        cp();
 
-       if(device_type == DEVICE_TYPE_TUNTAP) {
-               lenin = read(device_fd, packet->data, MTU);
-
-               if(lenin <= 0) {
-                       syslog(LOG_ERR, _("Error while reading from %s %s: %s"),
-                                  device_info, device, strerror(errno));
-                       return -1;
-               }
-
-               packet->len = lenin;
-       } else {                                        /* ethertap */
-
-               lenin = read(device_fd, packet->data - 2, MTU + 2);
-
-               if(lenin <= 0) {
-                       syslog(LOG_ERR, _("Error while reading from %s %s: %s"),
-                                  device_info, device, strerror(errno));
-                       return -1;
-               }
-
-               packet->len = lenin - 2;
+       switch(device_type) {
+               case DEVICE_TYPE_TUN:
+                       lenin = read(device_fd, packet->data + 10, MTU - 10);
+
+                       if(lenin <= 0) {
+                               syslog(LOG_ERR, _("Error while reading from %s %s: %s"),
+                                          device_info, device, strerror(errno));
+                               return -1;
+                       }
+
+                       packet->len = lenin + 10;
+                       break;
+               case DEVICE_TYPE_TAP:
+                       lenin = read(device_fd, packet->data, MTU);
+
+                       if(lenin <= 0) {
+                               syslog(LOG_ERR, _("Error while reading from %s %s: %s"),
+                                          device_info, device, strerror(errno));
+                               return -1;
+                       }
+
+                       packet->len = lenin;
+                       break;
+               case DEVICE_TYPE_ETHERTAP:
+                       lenin = read(device_fd, packet->data - 2, MTU + 2);
+
+                       if(lenin <= 0) {
+                               syslog(LOG_ERR, _("Error while reading from %s %s: %s"),
+                                          device_info, device, strerror(errno));
+                               return -1;
+                       }
+
+                       packet->len = lenin - 2;
+                       break;
        }
 
        device_total_in += packet->len;
@@ -191,20 +212,31 @@ int write_packet(vpn_packet_t *packet)
                syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
                           packet->len, device_info);
 
-       if(device_type == DEVICE_TYPE_TUNTAP) {
-               if(write(device_fd, packet->data, packet->len) < 0) {
-                       syslog(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
-                                  strerror(errno));
-                       return -1;
-               }
-       } else {                                        /* ethertap */
-               *(short int *)(packet->data - 2) = packet->len;
-
-               if(write(device_fd, packet->data - 2, packet->len + 2) < 0) {
-                       syslog(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
-                                  strerror(errno));
-                       return -1;
-               }
+       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) {
+                               syslog(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
+                                          strerror(errno));
+                               return -1;
+                       }
+                       break;
+               case DEVICE_TYPE_TAP:
+                       if(write(device_fd, packet->data, packet->len) < 0) {
+                               syslog(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
+                                          strerror(errno));
+                               return -1;
+                       }
+                       break;
+               case DEVICE_TYPE_ETHERTAP:
+                       *(short int *)(packet->data - 2) = packet->len;
+
+                       if(write(device_fd, packet->data - 2, packet->len + 2) < 0) {
+                               syslog(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
+                                          strerror(errno));
+                               return -1;
+                       }
+                       break;
        }
 
        device_total_out += packet->len;