+++ /dev/null
-/*
- device.c -- Interaction with Linux ethertap and tun/tap device
- Copyright (C) 2001-2005 Ivo Timmermans,
- 2001-2013 Guus Sliepen <guus@tinc-vpn.org>
-
- 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 <linux/if_tun.h>
-#define DEFAULT_DEVICE "/dev/net/tun"
-
-#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_TUN,
- DEVICE_TYPE_TAP,
-} device_type_t;
-
-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 bool setup_device(void) {
- if(!get_config_string(lookup_config(config_tree, "Device"), &device))
- device = xstrdup(DEFAULT_DEVICE);
-
- if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
- if(netname)
- iface = xstrdup(netname);
-
- 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
-
- 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;
- }
-
- 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)";
- }
-
-#ifdef IFF_ONE_QUEUE
- /* Set IFF_ONE_QUEUE flag... */
-
- bool t1q = false;
- if(get_config_bool(lookup_config(config_tree, "IffOneQueue"), &t1q) && t1q)
- ifr.ifr_flags |= IFF_ONE_QUEUE;
-#endif
-
- if(iface)
- strncpy(ifr.ifr_name, iface, IFNAMSIZ);
-
- if(!ioctl(device_fd, TUNSETIFF, &ifr)) {
- strncpy(ifrname, ifr.ifr_name, IFNAMSIZ);
- free(iface);
- iface = xstrdup(ifrname);
- }
-
- logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info);
-
- return true;
-}
-
-static void close_device(void) {
- close(device_fd);
-
- free(type);
- free(device);
- free(iface);
-}
-
-static bool read_packet(vpn_packet_t *packet) {
- int inlen;
-
- switch(device_type) {
- case DEVICE_TYPE_TUN:
- inlen = read(device_fd, packet->data + 10, MTU - 10);
-
- if(inlen <= 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s",
- device_info, device, strerror(errno));
- return false;
- }
-
- memset(packet->data, 0, 12);
- packet->len = inlen + 10;
- break;
- case DEVICE_TYPE_TAP:
- inlen = read(device_fd, packet->data, MTU);
-
- if(inlen <= 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:
- abort();
- }
-
- 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:
- packet->data[10] = packet->data[11] = 0;
- if(write(device_fd, packet->data + 10, packet->len - 10) < 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, "Can't write to %s %s: %s", device_info, device,
- strerror(errno));
- return false;
- }
- break;
- default:
- abort();
- }
-
- return true;
-}
-
-const devops_t os_devops = {
- .setup = setup_device,
- .close = close_device,
- .read = read_packet,
- .write = write_packet,
-};
projects / meshlink / blobdiff