X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Flinux%2Fdevice.c;h=302fa6288d946c66008987cdcc8d18b2f40b44b8;hp=0391f6a2f375280bf80a36e541063d298f470d1a;hb=855806b2f75fc1c566cfaac01c788cdc625b4687;hpb=f75dcef72a81a337e847adf0bae54198894f65b9 diff --git a/src/linux/device.c b/src/linux/device.c index 0391f6a2..302fa628 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, + 2001-2006 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 @@ -17,191 +17,202 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: device.c,v 1.1.2.11 2002/09/09 21:25:23 guus Exp $ + $Id$ */ -#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/misc/net/tun" +#define DEFAULT_DEVICE "/dev/net/tun" #else #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 "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; +static device_type_t device_type; char *device; -char *interface; +char *iface; char ifrname[IFNAMSIZ]; char *device_info; -int device_total_in = 0; -int device_total_out = 0; - -extern subnet_t mymac; +static int device_total_in = 0; +static int device_total_out = 0; -/* - open the local ethertap device -*/ -int setup_device(void) +bool setup_device(void) { struct ifreq ifr; - cp if(!get_config_string(lookup_config(config_tree, "Device"), &device)) + cp(); + + if(!get_config_string(lookup_config(config_tree, "Device"), &device)) device = 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 + iface = netname; #else - interface = rindex(device, '/') ? rindex(device, '/') + 1 : device; + iface = rindex(device, '/') ? rindex(device, '/') + 1 : device; #endif - cp device_fd = open(device, O_RDWR | O_NONBLOCK); + 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; } - 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 + +#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)); - 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; + 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); - 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"); + iface = 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; + iface = ifrname; } else #endif { + 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; + iface = rindex(device, '/') ? rindex(device, '/') + 1 : device; } - syslog(LOG_INFO, _("%s is a %s"), device, device_info); - cp return 0; + logger(LOG_INFO, _("%s is a %s"), device, device_info); + + return true; } void close_device(void) { - cp close(device_fd); + cp(); + + close(device_fd); } -/* - read, encrypt and send data that is - available through the ethertap device -*/ -int read_packet(vpn_packet_t * packet) +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; + + cp(); + + 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; -cp} + return true; +} -int write_packet(vpn_packet_t * packet) +bool write_packet(vpn_packet_t *packet) { - cp if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"), + cp(); + + 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: + *(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; - cp 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); -cp} + 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); +}