X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Flinux%2Fdevice.c;h=2c40ead099b5a24f4ee86e8b4037b40544821113;hb=43cf631bc10097448db041639ad07f84f647017e;hp=f50ff1123be023261f23ac52deed8063309f906f;hpb=1b2846d907adfc8472fc9da0c951c3243c7ee143;p=tinc diff --git a/src/linux/device.c b/src/linux/device.c index f50ff112..2c40ead0 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) 2001-2005 Ivo Timmermans, - 2001-2012 Guus Sliepen + 2001-2014 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 @@ -18,25 +18,22 @@ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ -#include "system.h" +#include "../system.h" -#ifdef HAVE_LINUX_IF_TUN_H #include #define DEFAULT_DEVICE "/dev/net/tun" -#else -#define DEFAULT_DEVICE "/dev/tap0" -#endif -#include "conf.h" -#include "device.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; @@ -45,30 +42,24 @@ int device_fd = -1; 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; +static const char *device_info; static bool setup_device(void) { - struct ifreq ifr; - bool t1q = false; - - if(!get_config_string(lookup_config(config_tree, "Device"), &device)) + 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; } @@ -76,15 +67,24 @@ static bool setup_device(void) { fcntl(device_fd, F_SETFD, FD_CLOEXEC); #endif -#ifdef HAVE_LINUX_IF_TUN_H - /* Ok now check if this is an old ethertap or a new tun/tap thingie */ + struct ifreq ifr = {{{0}}}; + + get_config_string(lookup_config(config_tree, "DeviceType"), &type); + + if(type && strcasecmp(type, "tun") && strcasecmp(type, "tap")) { + logger(DEBUG_ALWAYS, LOG_ERR, "Unknown device type %s!", type); + return false; + } - memset(&ifr, 0, sizeof(ifr)); - if(routing_mode == RMODE_ROUTER) { + 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 { + if(routing_mode == RMODE_ROUTER) { + overwrite_mac = true; + } + ifr.ifr_flags = IFF_TAP | IFF_NO_PI; device_type = DEVICE_TYPE_TAP; device_info = "Linux tun/tap device (tap mode)"; @@ -92,133 +92,130 @@ static bool setup_device(void) { #ifdef IFF_ONE_QUEUE /* Set IFF_ONE_QUEUE flag... */ - if(get_config_bool(lookup_config(config_tree, "IffOneQueue"), &t1q) && t1q) + + bool t1q = false; + + if(get_config_bool(lookup_config(config_tree, "IffOneQueue"), &t1q) && t1q) { ifr.ifr_flags |= IFF_ONE_QUEUE; + } + #endif - if(iface) + 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); + 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); + } else { + logger(DEBUG_ALWAYS, LOG_ERR, "Could not create a tun/tap interface from %s: %s", device, strerror(errno)); + return false; } - logger(LOG_INFO, "%s is a %s", device, device_info); + logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info); + + if(ifr.ifr_flags & IFF_TAP) { + struct ifreq ifr_mac = {{{0}}}; + + if(!ioctl(device_fd, SIOCGIFHWADDR, &ifr_mac)) { + memcpy(mymac.x, ifr_mac.ifr_hwaddr.sa_data, ETH_ALEN); + } else { + logger(DEBUG_ALWAYS, LOG_WARNING, "Could not get MAC address of %s: %s", device, strerror(errno)); + } + } return true; } static void close_device(void) { close(device_fd); + device_fd = -1; + free(type); + type = NULL; free(device); + device = NULL; free(iface); + iface = NULL; + device_info = NULL; } static bool read_packet(vpn_packet_t *packet) { - int lenin; - + int inlen; + switch(device_type) { - case DEVICE_TYPE_TUN: - lenin = read(device_fd, packet->data + 10, MTU - 10); + case DEVICE_TYPE_TUN: + inlen = read(device_fd, DATA(packet) + 10, MTU - 10); - if(lenin <= 0) { - logger(LOG_ERR, "Error while reading from %s %s: %s", - device_info, device, strerror(errno)); - return false; + if(inlen <= 0) { + logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", + device_info, device, strerror(errno)); + + if(errno == EBADFD) { /* File descriptor in bad state */ + event_exit(); } - packet->len = lenin + 10; - break; - case DEVICE_TYPE_TAP: - lenin = read(device_fd, packet->data, MTU); + return false; + } - if(lenin <= 0) { - logger(LOG_ERR, "Error while reading from %s %s: %s", - device_info, device, strerror(errno)); - return false; - } + memset(DATA(packet), 0, 12); + packet->len = inlen + 10; + break; - packet->len = lenin; - break; - case DEVICE_TYPE_ETHERTAP: - lenin = read(device_fd, packet->data - 2, MTU + 2); + case DEVICE_TYPE_TAP: + inlen = read(device_fd, DATA(packet), MTU); - if(lenin <= 0) { - logger(LOG_ERR, "Error while reading from %s %s: %s", - device_info, device, strerror(errno)); - return false; - } + 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; - break; - } + packet->len = inlen; + break; - device_total_in += packet->len; + default: + abort(); + } - ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s", packet->len, - device_info); + logger(DEBUG_TRAFFIC, LOG_DEBUG, "Read packet of %d bytes from %s", packet->len, + device_info); return true; } static bool write_packet(vpn_packet_t *packet) { - ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s", - packet->len, device_info); + 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, - 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; - } + case DEVICE_TYPE_TUN: + DATA(packet)[10] = DATA(packet)[11] = 0; - device_total_out += packet->len; + if(write(device_fd, DATA(packet) + 10, packet->len - 10) < 0) { + logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, + strerror(errno)); + return false; + } - return true; -} + break; -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); + case DEVICE_TYPE_TAP: + if(write(device_fd, DATA(packet), packet->len) < 0) { + logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, + strerror(errno)); + return false; + } + + break; + + default: + abort(); + } + + return true; } const devops_t os_devops = { @@ -226,5 +223,4 @@ const devops_t os_devops = { .close = close_device, .read = read_packet, .write = write_packet, - .dump_stats = dump_device_stats, };