+/*
+ device.c -- Interaction BSD tun/tap device
+ Copyright (C) 2001-2004 Ivo Timmermans <ivo@tinc-vpn.org>,
+ 2001-2004 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
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ 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 1398 2004-11-01 15:18:53Z guus $
+*/
+
+#include "system.h"
+
+#include "conf.h"
+#include "logger.h"
+#include "net.h"
+#include "route.h"
+#include "utils.h"
+
+#define DEFAULT_DEVICE "/dev/tun0"
+
+typedef enum device_type {
+ DEVICE_TYPE_TUN,
+ DEVICE_TYPE_TUNIFHEAD,
+ DEVICE_TYPE_TAP,
+} device_type_t;
+
+int device_fd = -1;
+char *device;
+char *iface;
+char *device_info;
+static int device_total_in = 0;
+static int device_total_out = 0;
+#ifdef HAVE_OPENBSD
+static device_type_t device_type = DEVICE_TYPE_TUNIFHEAD;
+#else
+static device_type_t device_type = DEVICE_TYPE_TUN;
+#endif
+
+bool setup_device(void) {
+#ifdef TUNSIFHEAD
+ const int zero = 0;
+ const int one = 1;
+#endif
+ char *type;
+
+ cp();
+
+ if(!get_config_string(lookup_config(config_tree, "Device"), &device))
+ device = DEFAULT_DEVICE;
+
+ if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
+ iface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
+
+ if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
+ logger(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
+ return false;
+ }
+
+ if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
+ if(!strcasecmp(type, "tun"))
+ /* use default */;
+ else if(!strcasecmp(type, "tunnohead"))
+ device_type = DEVICE_TYPE_TUN;
+ else if(!strcasecmp(type, "tunifhead"))
+ device_type = DEVICE_TYPE_TUNIFHEAD;
+ else if(!strcasecmp(type, "tap"))
+ device_type = DEVICE_TYPE_TAP;
+ else {
+ logger(LOG_ERR, _("Unknown device type %s!"), type);
+ return false;
+ }
+ } else {
+ if(strstr(device, "tap"))
+ device_type = DEVICE_TYPE_TAP;
+ }
+
+ switch(device_type) {
+ default:
+ device_type = DEVICE_TYPE_TUN;
+ case DEVICE_TYPE_TUN:
+#ifdef TUNSIFHEAD
+ if(ioctl(device_fd, TUNSIFHEAD, &zero, sizeof zero) == -1) {
+ logger(LOG_ERR, _("System call `%s' failed: %s"), "ioctl", strerror(errno));
+ return false;
+ }
+#endif
+ device_info = _("Generic BSD tun device");
+ break;
+ case DEVICE_TYPE_TUNIFHEAD:
+#ifdef TUNSIFHEAD
+ if(ioctl(device_fd, TUNSIFHEAD, &one, sizeof one) == -1) {
+ logger(LOG_ERR, _("System call `%s' failed: %s"), "ioctl", strerror(errno));
+ return false;
+ }
+#endif
+ device_info = _("Generic BSD tun device");
+ break;
+ case DEVICE_TYPE_TAP:
+ if(routing_mode == RMODE_ROUTER)
+ overwrite_mac = true;
+ device_info = _("Generic BSD tap device");
+ break;
+ }
+
+ logger(LOG_INFO, _("%s is a %s"), device, device_info);
+
+ return true;
+}
+
+void close_device(void) {
+ cp();
+
+ close(device_fd);
+}
+
+bool read_packet(vpn_packet_t *packet) {
+ int lenin;
+
+ cp();
+
+ switch(device_type) {
+ case DEVICE_TYPE_TUN:
+ if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
+ logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
+ device, strerror(errno));
+ return false;
+ }
+
+ switch(packet->data[14] >> 4) {
+ case 4:
+ packet->data[12] = 0x08;
+ packet->data[13] = 0x00;
+ break;
+ case 6:
+ packet->data[12] = 0x86;
+ packet->data[13] = 0xDD;
+ break;
+ default:
+ ifdebug(TRAFFIC) logger(LOG_ERR,
+ _ ("Unknown IP version %d while reading packet from %s %s"),
+ packet->data[14] >> 4, device_info, device);
+ return false;
+ }
+
+ packet->len = lenin + 14;
+ break;
+
+ case DEVICE_TYPE_TUNIFHEAD: {
+ u_int32_t type;
+ struct iovec vector[2] = {{&type, sizeof(type)}, {packet->data + 14, MTU - 14}};
+
+ if((lenin = readv(device_fd, vector, 2)) <= 0) {
+ logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
+ device, strerror(errno));
+ return false;
+ }
+
+ switch (ntohl(type)) {
+ case AF_INET:
+ packet->data[12] = 0x08;
+ packet->data[13] = 0x00;
+ break;
+
+ case AF_INET6:
+ packet->data[12] = 0x86;
+ packet->data[13] = 0xDD;
+ break;
+
+ default:
+ ifdebug(TRAFFIC) logger(LOG_ERR,
+ _ ("Unknown address family %x while reading packet from %s %s"),
+ ntohl(type), device_info, device);
+ return false;
+ }
+
+ packet->len = lenin + 10;
+ break;
+ }
+
+ case DEVICE_TYPE_TAP:
+ if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
+ logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
+ device, strerror(errno));
+ return false;
+ }
+
+ packet->len = lenin;
+ break;
+
+ default:
+ return false;
+ }
+
+ device_total_in += packet->len;
+
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"),
+ packet->len, device_info);
+
+ return true;
+}
+
+bool write_packet(vpn_packet_t *packet)
+{
+ cp();
+
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
+ packet->len, device_info);
+
+ switch(device_type) {
+ case DEVICE_TYPE_TUN:
+ if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
+ logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info,
+ device, strerror(errno));
+ return false;
+ }
+ break;
+
+ case DEVICE_TYPE_TUNIFHEAD: {
+ u_int32_t type;
+ struct iovec vector[2] = {{&type, sizeof(type)}, {packet->data + 14, MTU - 14}};
+ int af;
+
+ af = (packet->data[12] << 8) + packet->data[13];
+
+ switch (af) {
+ case 0x0800:
+ type = htonl(AF_INET);
+ break;
+ case 0x86DD:
+ type = htonl(AF_INET6);
+ break;
+ default:
+ ifdebug(TRAFFIC) logger(LOG_ERR,
+ _("Unknown address family %x while writing packet to %s %s"),
+ af, device_info, device);
+ return false;
+ }
+
+ if(writev(device_fd, vector, 2) < 0) {
+ logger(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
+ strerror(errno));
+ return false;
+ }
+ break;
+ }
+
+ case DEVICE_TYPE_TAP:
+ if(write(device_fd, packet->data, packet->len) < 0) {
+ logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info,
+ device, strerror(errno));
+ return false;
+ }
+ break;
+
+ default:
+ return false;
+ }
+
+ device_total_out += packet->len;
+
+ return true;
+}
+
+void dump_device_stats(void)
+{
+ cp();
+
+ logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
+ logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
+ logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
+}
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