+++ /dev/null
-/*
- device.c -- Interaction BSD tun/tap device
- Copyright (C) 2001-2005 Ivo Timmermans,
- 2001-2013 Guus Sliepen <guus@tinc-vpn.org>
- 2009 Grzegorz Dymarek <gregd72002@googlemail.com>
-
- 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
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- 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.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-
-#include "../system.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"
-
-#ifdef ENABLE_TUNEMU
-#include "bsd/tunemu.h"
-#endif
-
-#define DEFAULT_TUN_DEVICE "/dev/tun0"
-#if defined(HAVE_FREEBSD) || defined(HAVE_NETBSD)
-#define DEFAULT_TAP_DEVICE "/dev/tap0"
-#else
-#define DEFAULT_TAP_DEVICE "/dev/tun0"
-#endif
-
-typedef enum device_type {
- DEVICE_TYPE_TUN,
- DEVICE_TYPE_TUNIFHEAD,
- DEVICE_TYPE_TAP,
-#ifdef ENABLE_TUNEMU
- DEVICE_TYPE_TUNEMU,
-#endif
-} device_type_t;
-
-int device_fd = -1;
-char *device = NULL;
-char *iface = NULL;
-static char *device_info = NULL;
-#if defined(ENABLE_TUNEMU)
-static device_type_t device_type = DEVICE_TYPE_TUNEMU;
-#elif defined(HAVE_OPENBSD) || defined(HAVE_FREEBSD) || defined(HAVE_DRAGONFLY)
-static device_type_t device_type = DEVICE_TYPE_TUNIFHEAD;
-#else
-static device_type_t device_type = DEVICE_TYPE_TUN;
-#endif
-
-static bool setup_device(void) {
- char *type;
-
- if(!get_config_string(lookup_config(config_tree, "Device"), &device)) {
- if(routing_mode == RMODE_ROUTER)
- device = xstrdup(DEFAULT_TUN_DEVICE);
- else
- device = xstrdup(DEFAULT_TAP_DEVICE);
- }
-
- if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
- iface = xstrdup(strrchr(device, '/') ? strrchr(device, '/') + 1 : device);
-
- if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
- if(!strcasecmp(type, "tun"))
- /* use default */;
-#ifdef ENABLE_TUNEMU
- else if(!strcasecmp(type, "tunemu"))
- device_type = DEVICE_TYPE_TUNEMU;
-#endif
- else if(!strcasecmp(type, "tunnohead"))
- device_type = DEVICE_TYPE_TUN;
- else if(!strcasecmp(type, "tunifhead"))
- device_type = DEVICE_TYPE_TUNIFHEAD;
- else if(!strcasecmp(type, "tap"))
- device_type = DEVICE_TYPE_TAP;
- else {
- logger(DEBUG_ALWAYS, LOG_ERR, "Unknown device type %s!", type);
- return false;
- }
- } else {
- if(strstr(device, "tap") || routing_mode != RMODE_ROUTER)
- device_type = DEVICE_TYPE_TAP;
- }
-
- switch(device_type) {
-#ifdef ENABLE_TUNEMU
- case DEVICE_TYPE_TUNEMU: {
- char dynamic_name[256] = "";
- device_fd = tunemu_open(dynamic_name);
- }
- break;
-#endif
- default:
- device_fd = open(device, O_RDWR | O_NONBLOCK);
- }
-
- if(device_fd < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", device, strerror(errno));
- return false;
- }
-
-#ifdef FD_CLOEXEC
- fcntl(device_fd, F_SETFD, FD_CLOEXEC);
-#endif
-
- switch(device_type) {
- default:
- device_type = DEVICE_TYPE_TUN;
- case DEVICE_TYPE_TUN:
-#ifdef TUNSIFHEAD
- {
- const int zero = 0;
- if(ioctl(device_fd, TUNSIFHEAD, &zero, sizeof zero) == -1) {
- logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "ioctl", strerror(errno));
- return false;
- }
- }
-#endif
-#if defined(TUNSIFMODE) && defined(IFF_BROADCAST) && defined(IFF_MULTICAST)
- {
- const int mode = IFF_BROADCAST | IFF_MULTICAST;
- ioctl(device_fd, TUNSIFMODE, &mode, sizeof mode);
- }
-#endif
-
- device_info = "Generic BSD tun device";
- break;
- case DEVICE_TYPE_TUNIFHEAD:
-#ifdef TUNSIFHEAD
- {
- const int one = 1;
- if(ioctl(device_fd, TUNSIFHEAD, &one, sizeof one) == -1) {
- logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "ioctl", strerror(errno));
- return false;
- }
- }
-#endif
-#if defined(TUNSIFMODE) && defined(IFF_BROADCAST) && defined(IFF_MULTICAST)
- {
- const int mode = IFF_BROADCAST | IFF_MULTICAST;
- ioctl(device_fd, TUNSIFMODE, &mode, sizeof mode);
- }
-#endif
-
- device_info = "Generic BSD tun device";
- break;
- case DEVICE_TYPE_TAP:
- if(routing_mode == RMODE_ROUTER)
- overwrite_mac = true;
- device_info = "Generic BSD tap device";
-#ifdef TAPGIFNAME
- {
- struct ifreq ifr;
- if(ioctl(device_fd, TAPGIFNAME, (void*)&ifr) == 0) {
- if(iface)
- free(iface);
- iface = xstrdup(ifr.ifr_name);
- }
- }
-
-#endif
- break;
-#ifdef ENABLE_TUNEMU
- case DEVICE_TYPE_TUNEMU:
- device_info = "BSD tunemu device";
- break;
-#endif
- }
-
- logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info);
-
- return true;
-}
-
-static void close_device(void) {
- switch(device_type) {
-#ifdef ENABLE_TUNEMU
- case DEVICE_TYPE_TUNEMU:
- tunemu_close(device_fd);
- break;
-#endif
- default:
- close(device_fd);
- }
-
- free(device);
- free(iface);
-}
-
-static bool read_packet(vpn_packet_t *packet) {
- int inlen;
-
- switch(device_type) {
- case DEVICE_TYPE_TUN:
-#ifdef ENABLE_TUNEMU
- case DEVICE_TYPE_TUNEMU:
- if(device_type == DEVICE_TYPE_TUNEMU)
- inlen = tunemu_read(device_fd, packet->data + 14, MTU - 14);
- else
-#endif
- inlen = read(device_fd, packet->data + 14, MTU - 14);
-
- if(inlen <= 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info,
- device, strerror(errno));
- return false;
- }
-
- switch(packet->data[14] >> 4) {
- case 4:
- packet->data[12] = 0x08;
- packet->data[13] = 0x00;
- break;
- case 6:
- packet->data[12] = 0x86;
- packet->data[13] = 0xDD;
- break;
- default:
- logger(DEBUG_TRAFFIC, LOG_ERR,
- "Unknown IP version %d while reading packet from %s %s",
- packet->data[14] >> 4, device_info, device);
- return false;
- }
-
- memset(packet->data, 0, 12);
- packet->len = inlen + 14;
- break;
-
- case DEVICE_TYPE_TUNIFHEAD: {
- u_int32_t type;
- struct iovec vector[2] = {{&type, sizeof type}, {packet->data + 14, MTU - 14}};
-
- if((inlen = readv(device_fd, vector, 2)) <= 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info,
- device, strerror(errno));
- return false;
- }
-
- switch (ntohl(type)) {
- case AF_INET:
- packet->data[12] = 0x08;
- packet->data[13] = 0x00;
- break;
-
- case AF_INET6:
- packet->data[12] = 0x86;
- packet->data[13] = 0xDD;
- break;
-
- default:
- logger(DEBUG_TRAFFIC, LOG_ERR,
- "Unknown address family %x while reading packet from %s %s",
- ntohl(type), device_info, device);
- return false;
- }
-
- memset(packet->data, 0, 12);
- packet->len = inlen + 10;
- break;
- }
-
- case DEVICE_TYPE_TAP:
- if((inlen = read(device_fd, packet->data, MTU)) <= 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info,
- device, strerror(errno));
- return false;
- }
-
- packet->len = inlen;
- break;
-
- default:
- return false;
- }
-
- 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) {
- logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s",
- packet->len, device_info);
-
- switch(device_type) {
- case DEVICE_TYPE_TUN:
- if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Error while writing to %s %s: %s", device_info,
- device, strerror(errno));
- return false;
- }
- break;
-
- case DEVICE_TYPE_TUNIFHEAD: {
- u_int32_t type;
- struct iovec vector[2] = {{&type, sizeof type}, {packet->data + 14, packet->len - 14}};
- int af;
-
- af = (packet->data[12] << 8) + packet->data[13];
-
- switch (af) {
- case 0x0800:
- type = htonl(AF_INET);
- break;
- case 0x86DD:
- type = htonl(AF_INET6);
- break;
- default:
- logger(DEBUG_TRAFFIC, LOG_ERR,
- "Unknown address family %x while writing packet to %s %s",
- af, device_info, device);
- return false;
- }
-
- if(writev(device_fd, vector, 2) < 0) {
- logger(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, LOG_ERR, "Error while writing to %s %s: %s", device_info,
- device, strerror(errno));
- return false;
- }
- break;
-
-#ifdef ENABLE_TUNEMU
- case DEVICE_TYPE_TUNEMU:
- if(tunemu_write(device_fd, packet->data + 14, packet->len - 14) < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Error while writing to %s %s: %s", device_info,
- device, strerror(errno));
- return false;
- }
- break;
-#endif
-
- default:
- return false;
- }
-
- return true;
-}
-
-const devops_t os_devops = {
- .setup = setup_device,
- .close = close_device,
- .read = read_packet,
- .write = write_packet,
-};
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