X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Flinux%2Fdevice.c;h=caee25487c4206b0a3395629be525f25f72dfb41;hp=1cb43077ade594f9749739d887660e02ed5c7605;hb=00ddbf5723511d80fbd2522fc503bd409dc6189a;hpb=ac066bb057dcb187bf91670793ba5e6ca456e052 diff --git a/src/linux/device.c b/src/linux/device.c index 1cb43077..caee2548 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) 2001-2003 Ivo Timmermans , + 2001-2003 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 @@ -17,197 +17,206 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: device.c,v 1.1.2.3 2001/10/27 13:13:35 guus Exp $ + $Id: device.c,v 1.1.2.19 2003/07/18 13:41:36 guus Exp $ */ -#include "config.h" - -#include -#include -#include -#include -#include -#include -#include -#include -#include +#include "system.h" #ifdef HAVE_TUNTAP - #ifdef LINUX_IF_TUN_H - #include LINUX_IF_TUN_H - #else - #include - #endif - #define DEFAULT_DEVICE "/dev/misc/net/tun" +#ifdef LINUX_IF_TUN_H +#include LINUX_IF_TUN_H +#else +#include +#endif +#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 "system.h" +#include "route.h" +#include "utils.h" -#define DEVICE_TYPE_ETHERTAP 0 -#define DEVICE_TYPE_TUNTAP 1 +enum { + DEVICE_TYPE_ETHERTAP, + DEVICE_TYPE_TUN, + DEVICE_TYPE_TAP, +}; int device_fd = -1; int device_type; -char *device_fname; +char *device; +char *iface; +char ifrname[IFNAMSIZ]; char *device_info; int device_total_in = 0; int device_total_out = 0; -subnet_t mymac; - -/* - open the local ethertap device -*/ int setup_device(void) { - struct ifreq ifr; - -cp - if(!get_config_string(lookup_config(config_tree, "Device"), &device_fname)) - device_fname = DEFAULT_DEVICE; - -cp - if((device_fd = open(device_fname, O_RDWR | O_NONBLOCK)) < 0) - { - syslog(LOG_ERR, _("Could not open %s: %m"), device_fname); - 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; + 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"), &iface)) #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 (netname) - strncpy(ifr.ifr_name, netname, IFNAMSIZ); -cp - if (!ioctl(device_fd, TUNSETIFF, (void *) &ifr)) - { - device_info = _("Linux tun/tap device"); - device_type = DEVICE_TYPE_TUNTAP; - } - else - if (!ioctl(device_fd, (('T'<< 8) | 202), (void *) &ifr)) - { - syslog(LOG_WARNING, _("Old ioctl() request was needed for %s"), device_fname); - device_type = DEVICE_TYPE_TUNTAP; - device_info = _("Linux tun/tap device"); - } - else + iface = netname; +#else + iface = 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 -1; + } + +#ifdef HAVE_TUNTAP + /* 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, (void *) &ifr)) { + strncpy(ifrname, ifr.ifr_name, IFNAMSIZ); + iface = ifrname; + } else if(!ioctl(device_fd, (('T' << 8) | 202), (void *) &ifr)) { + logger(LOG_WARNING, _("Old ioctl() request was needed for %s"), device); + strncpy(ifrname, ifr.ifr_name, IFNAMSIZ); + iface = ifrname; + } else #endif - { - device_info = _("Linux ethertap device"); - device_type = DEVICE_TYPE_ETHERTAP; - } - - syslog(LOG_INFO, _("%s is a %s"), device_fname, device_info); -cp - return 0; + { + if(routing_mode == RMODE_ROUTER) + overwrite_mac = 1; + device_info = _("Linux ethertap device"); + device_type = DEVICE_TYPE_ETHERTAP; + iface = rindex(device, '/') ? rindex(device, '/') + 1 : device; + } + + logger(LOG_INFO, _("%s is a %s"), device, device_info); + + return 0; } 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) { - 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_fname); - 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_fname); - 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 + int lenin; + + 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 -1; + } + + 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 -1; + } + + 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 -1; + } + + 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 0; } 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_fname); - 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_fname); - return -1; - } - } - - device_total_out += packet->len; -cp - return 0; + cp(); + + 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 -1; + } + 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 -1; + } + 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 -1; + } + break; + } + + device_total_out += packet->len; + + return 0; } void dump_device_stats(void) { -cp - syslog(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device_fname); - 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); }