/*
device.c -- Interaction with Linux ethertap and tun/tap device
Copyright (C) 2001-2005 Ivo Timmermans,
- 2001-2009 Guus Sliepen <guus@tinc-vpn.org>
+ 2001-2013 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
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#include "system.h"
+#include "../system.h"
-#ifdef HAVE_LINUX_IF_TUN_H
#include <linux/if_tun.h>
#define DEFAULT_DEVICE "/dev/net/tun"
-#else
-#define DEFAULT_DEVICE "/dev/tap0"
-#endif
-#include "conf.h"
-#include "logger.h"
-#include "net.h"
-#include "route.h"
-#include "utils.h"
-#include "xalloc.h"
+#include "../conf.h"
+#include "../device.h"
+#include "../logger.h"
+#include "../names.h"
+#include "../net.h"
+#include "../route.h"
+#include "../utils.h"
+#include "../xalloc.h"
+#include "../device.h"
typedef enum device_type_t {
- DEVICE_TYPE_ETHERTAP,
DEVICE_TYPE_TUN,
DEVICE_TYPE_TAP,
} device_type_t;
static device_type_t device_type;
char *device = NULL;
char *iface = NULL;
+static char *type = NULL;
static char ifrname[IFNAMSIZ];
static char *device_info;
-static uint64_t device_total_in = 0;
-static uint64_t device_total_out = 0;
-
-bool setup_device(void) {
- struct ifreq ifr;
- bool t1q = false;
+uint64_t device_in_packets = 0;
+uint64_t device_in_bytes = 0;
+uint64_t device_out_packets = 0;
+uint64_t device_out_bytes = 0;
+static bool setup_device(void) {
if(!get_config_string(lookup_config(config_tree, "Device"), &device))
device = xstrdup(DEFAULT_DEVICE);
if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
-#ifdef HAVE_LINUX_IF_TUN_H
- if (netname != NULL)
+ if(netname)
iface = xstrdup(netname);
-#else
- iface = xstrdup(strrchr(device, '/') ? strrchr(device, '/') + 1 : device);
-#endif
+
device_fd = open(device, O_RDWR | O_NONBLOCK);
if(device_fd < 0) {
- logger(LOG_ERR, "Could not open %s: %s", device, strerror(errno));
+ logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", device, strerror(errno));
return false;
}
-#ifdef HAVE_LINUX_IF_TUN_H
- /* Ok now check if this is an old ethertap or a new tun/tap thingie */
+#ifdef FD_CLOEXEC
+ fcntl(device_fd, F_SETFD, FD_CLOEXEC);
+#endif
+
+ struct ifreq ifr = {{{0}}};
+
+ get_config_string(lookup_config(config_tree, "DeviceType"), &type);
- memset(&ifr, 0, sizeof(ifr));
- if(routing_mode == RMODE_ROUTER) {
+ if(type && strcasecmp(type, "tun") && strcasecmp(type, "tap")) {
+ logger(DEBUG_ALWAYS, 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)";
#ifdef IFF_ONE_QUEUE
/* Set IFF_ONE_QUEUE flag... */
+
+ bool t1q = false;
if(get_config_bool(lookup_config(config_tree, "IffOneQueue"), &t1q) && t1q)
ifr.ifr_flags |= IFF_ONE_QUEUE;
#endif
if(!ioctl(device_fd, TUNSETIFF, &ifr)) {
strncpy(ifrname, ifr.ifr_name, IFNAMSIZ);
- 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);
- if(iface) free(iface);
+ free(iface);
iface = xstrdup(ifrname);
- } else
-#endif
- {
- if(routing_mode == RMODE_ROUTER)
- overwrite_mac = true;
- device_info = "Linux ethertap device";
- device_type = DEVICE_TYPE_ETHERTAP;
- if(iface)
- free(iface);
- iface = xstrdup(strrchr(device, '/') ? strrchr(device, '/') + 1 : device);
}
- logger(LOG_INFO, "%s is a %s", device, device_info);
+ logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info);
return true;
}
-void close_device(void) {
+static void close_device(void) {
close(device_fd);
+ free(type);
free(device);
free(iface);
}
-bool read_packet(vpn_packet_t *packet) {
- int lenin;
-
+static bool read_packet(vpn_packet_t *packet) {
+ int inlen;
+
switch(device_type) {
case DEVICE_TYPE_TUN:
- lenin = read(device_fd, packet->data + 10, MTU - 10);
+ inlen = read(device_fd, packet->data + 10, MTU - 10);
- if(lenin <= 0) {
- logger(LOG_ERR, "Error while reading from %s %s: %s",
+ if(inlen <= 0) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s",
device_info, device, strerror(errno));
return false;
}
- packet->len = lenin + 10;
+ memset(packet->data, 0, 12);
+ packet->len = inlen + 10;
break;
case DEVICE_TYPE_TAP:
- lenin = read(device_fd, packet->data, MTU);
-
- if(lenin <= 0) {
- logger(LOG_ERR, "Error while reading from %s %s: %s",
- device_info, device, strerror(errno));
- return false;
- }
-
- packet->len = lenin;
- break;
- case DEVICE_TYPE_ETHERTAP:
- lenin = read(device_fd, packet->data - 2, MTU + 2);
+ inlen = read(device_fd, packet->data, MTU);
- if(lenin <= 0) {
- logger(LOG_ERR, "Error while reading from %s %s: %s",
+ if(inlen <= 0) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s",
device_info, device, strerror(errno));
return false;
}
- packet->len = lenin - 2;
+ packet->len = inlen;
break;
+ default:
+ abort();
}
- device_total_in += packet->len;
+ device_in_packets++;
+ device_in_bytes += packet->len;
- ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
+ logger(DEBUG_TRAFFIC, LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
device_info);
return true;
}
-bool write_packet(vpn_packet_t *packet) {
- ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
+static bool write_packet(vpn_packet_t *packet) {
+ logger(DEBUG_TRAFFIC, 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(LOG_ERR, "Can't write to %s %s: %s", device_info, device,
+ logger(DEBUG_ALWAYS, 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, "Can't write to %s %s: %s", device_info, device,
- strerror(errno));
- return false;
- }
- break;
- case DEVICE_TYPE_ETHERTAP:
- *(short int *)(packet->data - 2) = packet->len;
-
- if(write(device_fd, packet->data - 2, packet->len + 2) < 0) {
- logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device,
+ logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device,
strerror(errno));
return false;
}
break;
+ default:
+ abort();
}
- device_total_out += packet->len;
+ device_out_packets++;
+ device_out_bytes += packet->len;
return true;
}
-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);
+static void dump_device_stats(void) {
+ logger(DEBUG_ALWAYS, LOG_DEBUG, "Statistics for %s %s:", device_info, device);
+ logger(DEBUG_ALWAYS, LOG_DEBUG, " total bytes in: %10"PRIu64, device_in_bytes);
+ logger(DEBUG_ALWAYS, LOG_DEBUG, " total bytes out: %10"PRIu64, device_out_bytes);
}
+
+const devops_t os_devops = {
+ .setup = setup_device,
+ .close = close_device,
+ .read = read_packet,
+ .write = write_packet,
+ .dump_stats = dump_device_stats,
+};
projects / tinc / blobdiff