X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Flinux%2Fdevice.c;h=5ae89478c44254e36ca25c05e147259ad108c6db;hp=629b49e7f697d6ea2278158c46d5b8cc6507d099;hb=0a84f9cb8f52f2d2b4f03a5ad5ef9dfcd3509033;hpb=bf3a11898898c0618cd1b2e7a792b7d7fe56aecb diff --git a/src/linux/device.c b/src/linux/device.c index 629b49e7..5ae89478 100644 --- a/src/linux/device.c +++ b/src/linux/device.c @@ -1,7 +1,7 @@ /* device.c -- Interaction with Linux ethertap and tun/tap device - Copyright (C) 2001-2002 Ivo Timmermans , - 2001-2002 Guus Sliepen + Copyright (C) 2001-2005 Ivo Timmermans, + 2001-2012 Guus Sliepen 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 @@ -13,210 +13,228 @@ 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 1.1.2.13 2002/09/15 22:19:19 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#ifdef HAVE_TUNTAP -#ifdef LINUX_IF_TUN_H -#include LINUX_IF_TUN_H -#else +#include "system.h" + +#ifdef HAVE_LINUX_IF_TUN_H #include -#endif #define DEFAULT_DEVICE "/dev/net/tun" #else #define DEFAULT_DEVICE "/dev/tap0" #endif -#include #include "conf.h" +#include "device.h" +#include "logger.h" #include "net.h" -#include "subnet.h" +#include "route.h" +#include "utils.h" +#include "xalloc.h" -#include "system.h" - -#define DEVICE_TYPE_ETHERTAP 0 -#define DEVICE_TYPE_TUNTAP 1 +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; -extern subnet_t mymac; - -/* - 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) { - syslog(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; } - /* Set default MAC address for ethertap devices */ - mymac.type = SUBNET_MAC; - mymac.net.mac.address.x[0] = 0xfe; - mymac.net.mac.address.x[1] = 0xfd; - mymac.net.mac.address.x[2] = 0x00; - mymac.net.mac.address.x[3] = 0x00; - mymac.net.mac.address.x[4] = 0x00; - mymac.net.mac.address.x[5] = 0x00; +#ifdef FD_CLOEXEC + fcntl(device_fd, F_SETFD, FD_CLOEXEC); +#endif -#ifdef HAVE_TUNTAP +#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)); - ifr.ifr_flags = IFF_TAP | IFF_NO_PI; - if(interface) - strncpy(ifr.ifr_name, interface, IFNAMSIZ); + 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)"; + } else { + ifr.ifr_flags = IFF_TAP | IFF_NO_PI; + device_type = DEVICE_TYPE_TAP; + device_info = "Linux tun/tap device (tap mode)"; + } - if(!ioctl(device_fd, TUNSETIFF, (void *) &ifr)) { - device_info = _("Linux tun/tap device"); - device_type = DEVICE_TYPE_TUNTAP; +#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, &ifr)) { 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"); + 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 { - device_info = _("Linux ethertap device"); + if(routing_mode == RMODE_ROUTER) + 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); } - syslog(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(); - - 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) { + logger(LOG_ERR, "Error while reading from %s %s: %s", + device_info, device, strerror(errno)); + return false; + } + + packet->len = lenin + 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); + + if(lenin <= 0) { + logger(LOG_ERR, "Error while reading from %s %s: %s", + device_info, device, strerror(errno)); + return false; + } + + packet->len = lenin - 2; + break; } device_total_in += packet->len; - if(debug_lvl >= DEBUG_TRAFFIC) { - syslog(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(); - - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(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); - 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) { + 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, "Can't write to %s %s: %s", device_info, device, + strerror(errno)); + return false; + } + break; + case DEVICE_TYPE_ETHERTAP: + memcpy(packet->data - 2, &packet->len, 2); + + if(write(device_fd, packet->data - 2, packet->len + 2) < 0) { + logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device, + strerror(errno)); + return false; + } + break; } device_total_out += packet->len; - return 0; + return true; } -void dump_device_stats(void) -{ - cp(); - - syslog(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device); - syslog(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in); - syslog(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, +};