X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Flinux%2Fdevice.c;h=35c66d55a44ddad0155576cba8f5a9e9a49b6777;hp=02d7a7a5c843350296cb0d4f5ac650d5013cea2d;hb=4c85542894f7fca823b119b05e07179deb24229a;hpb=c0a3f67a5d66088aaf526f1461986f9e86d5dd1f diff --git a/src/linux/device.c b/src/linux/device.c index 02d7a7a5..35c66d55 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 Ivo Timmermans , - 2001 Guus Sliepen + Copyright (C) 2001-2005 Ivo Timmermans, + 2001-2009 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 @@ -13,209 +13,198 @@ 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 1.1.2.4 2001/10/31 12:50:24 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 - -#ifdef HAVE_TUNTAP - #ifdef LINUX_IF_TUN_H - #include LINUX_IF_TUN_H - #else - #include - #endif - #define DEFAULT_DEVICE "/dev/misc/net/tun" +#include "system.h" + +#ifdef HAVE_LINUX_IF_TUN_H +#include +#define DEFAULT_DEVICE "/dev/net/tun" #else - #define DEFAULT_DEVICE "/dev/tap0" +#define DEFAULT_DEVICE "/dev/tap0" #endif -#include #include "conf.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 ifrname[IFNAMSIZ]; +static char *device_info; -int device_total_in = 0; -int device_total_out = 0; +static int device_total_in = 0; +static int device_total_out = 0; -subnet_t mymac; +bool setup_device(void) { + struct ifreq ifr; -/* - open the local ethertap device -*/ -int setup_device(void) -{ - struct ifreq ifr; - -cp - if(!get_config_string(lookup_config(config_tree, "Device"), &device)) - device = DEFAULT_DEVICE; - - if(!get_config_string(lookup_config(config_tree, "Interface"), &interface)) - interface = netname; -cp - if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) - { - syslog(LOG_ERR, _("Could not open %s: %m"), device); - return -1; - } -cp - /* 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 HAVE_TUNTAP - /* Ok now check if this is an old ethertap or a new tun/tap thingie */ - - memset(&ifr, 0, sizeof(ifr)); -cp - ifr.ifr_flags = IFF_TAP | IFF_NO_PI; - if (interface) - strncpy(ifr.ifr_name, interface, IFNAMSIZ); -cp - 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 + 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) + iface = xstrdup(netname); +#else + iface = xstrdup(rindex(device, '/') ? rindex(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)); + return false; + } + +#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) { + 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(iface) + strncpy(ifr.ifr_name, iface, IFNAMSIZ); + + 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); + iface = xstrdup(ifrname); + } else #endif - { - device_info = _("Linux ethertap device"); - device_type = DEVICE_TYPE_ETHERTAP; - } - - syslog(LOG_INFO, _("%s is a %s"), device, device_info); -cp - return 0; + { + if(routing_mode == RMODE_ROUTER) + overwrite_mac = true; + device_info = "Linux ethertap device"; + device_type = DEVICE_TYPE_ETHERTAP; + if(iface) + free(iface); + iface = xstrdup(rindex(device, '/') ? rindex(device, '/') + 1 : device); + } + + logger(LOG_INFO, "%s is a %s", device, device_info); + + return true; } -void close_device(void) -{ -cp - close(device_fd); +void close_device(void) { + close(device_fd); + + free(device); + free(iface); } -/* - read, encrypt and send data that is - available through the ethertap device -*/ -int read_packet(vpn_packet_t *packet) -{ - int lenin; -cp - if(device_type == DEVICE_TYPE_TUNTAP) - { - if((lenin = read(device_fd, packet->data, MTU)) <= 0) - { - syslog(LOG_ERR, _("Error while reading from %s %s: %m"), device_info, device); - return -1; - } - - packet->len = lenin; - } - else /* ethertap */ - { - struct iovec vector[2] = {{&packet->len, 2}, {packet->data, MTU}}; - - if((lenin = readv(device_fd, vector, 2)) <= 0) - { - syslog(LOG_ERR, _("Error while reading from %s %s: %m"), device_info, device); - return -1; - } - - packet->len = lenin - 2; - } - - device_total_in += packet->len; - - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len, device_info); - } - - return 0; -cp +bool read_packet(vpn_packet_t *packet) { + int lenin; + + 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; + + ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s", packet->len, + device_info); + + 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"), - 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: %m"), device_info, device); - return -1; - } - } - else/* ethertap */ - { - struct iovec vector[2] = {{&packet->len, 2}, {packet->data, MTU}}; - - if(writev(device_fd, vector, 2) < 0) - { - syslog(LOG_ERR, _("Can't write to %s %s: %m"), device_info, device); - return -1; - } - } - - device_total_out += packet->len; -cp - return 0; +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(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, + strerror(errno)); + return false; + } + break; + } + + device_total_out += packet->len; + + 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); -cp +void dump_device_stats(void) { + 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); }