/*
device.c -- Interaction BSD tun/tap device
Copyright (C) 2001-2005 Ivo Timmermans,
- 2001-2014 Guus Sliepen <guus@tinc-vpn.org>
+ 2001-2016 Guus Sliepen <guus@tinc-vpn.org>
2009 Grzegorz Dymarek <gregd72002@googlemail.com>
This program is free software; you can redistribute it and/or modify
#include "bsd/tunemu.h"
#endif
+#ifdef HAVE_NET_IF_UTUN_H
+#include <sys/sys_domain.h>
+#include <sys/kern_control.h>
+#include <net/if_utun.h>
+#endif
+
#define DEFAULT_TUN_DEVICE "/dev/tun0"
-#if defined(HAVE_DARWIN) || 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,
#ifdef ENABLE_TUNEMU
DEVICE_TYPE_TUNEMU,
#endif
+ DEVICE_TYPE_UTUN,
} device_type_t;
int device_fd = -1;
static device_type_t device_type = DEVICE_TYPE_TUN;
#endif
+#ifdef HAVE_NET_IF_UTUN_H
+static bool setup_utun(void) {
+ device_fd = socket(PF_SYSTEM, SOCK_DGRAM, SYSPROTO_CONTROL);
+ if(device_fd == -1) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Could not open PF_SYSTEM socket: %s\n", strerror(errno));
+ return false;
+ }
+
+ struct ctl_info info = {};
+ strlcpy(info.ctl_name, UTUN_CONTROL_NAME, sizeof info.ctl_name);
+
+ if(ioctl(device_fd, CTLIOCGINFO, &info) == -1) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "ioctl(CTLIOCGINFO) failed: %s", strerror(errno));
+ return false;
+ }
+
+ int unit = -1;
+ char *p = strstr(device, "utun"), *e = NULL;
+ if(p) {
+ unit = strtol(p + 4, &e, 10);
+ if(!e)
+ unit = -1;
+ }
+
+ struct sockaddr_ctl sc = {
+ .sc_id = info.ctl_id,
+ .sc_len = sizeof sc,
+ .sc_family = AF_SYSTEM,
+ .ss_sysaddr = AF_SYS_CONTROL,
+ .sc_unit = unit + 1,
+ };
+
+ if(connect(device_fd, (struct sockaddr *)&sc, sizeof(sc)) == -1) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Could not connect utun socket: %s\n", strerror(errno));
+ return false;
+ }
+
+ char name[64] = "";
+ socklen_t len = sizeof name;
+ if(getsockopt(device_fd, SYSPROTO_CONTROL, UTUN_OPT_IFNAME, name, &len)) {
+ iface = xstrdup(device);
+ } else {
+ iface = xstrdup(name);
+ }
+
+ device_info = "OS X utun device";
+
+ logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info);
+
+ return true;
+}
+#endif
+
static bool setup_device(void) {
get_config_string(lookup_config(config_tree, "Device"), &device);
+ // Find out if it's supposed to be a tun or a tap device
+
char *type;
if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
if(!strcasecmp(type, "tun"))
#ifdef ENABLE_TUNEMU
else if(!strcasecmp(type, "tunemu"))
device_type = DEVICE_TYPE_TUNEMU;
+#endif
+#ifdef HAVE_NET_IF_UTUN_H
+ else if(!strcasecmp(type, "utun"))
+ device_type = DEVICE_TYPE_UTUN;
#endif
else if(!strcasecmp(type, "tunnohead"))
device_type = DEVICE_TYPE_TUN;
return false;
}
} else {
+#ifdef HAVE_NET_IF_UTUN_H
+ if(strncmp(device, "utun", 4) == 0 || strncmp(device, "/dev/utun", 9) == 0)
+ device_type = DEVICE_TYPE_UTUN;
+ else
+#endif
if((device && strstr(device, "tap")) || routing_mode != RMODE_ROUTER)
device_type = DEVICE_TYPE_TAP;
}
+ if(routing_mode == RMODE_SWITCH && device_type != DEVICE_TYPE_TAP) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Only tap devices support switch mode!");
+ return false;
+ }
+
+ // Find out which device file to open
+
if(!device) {
if(device_type == DEVICE_TYPE_TAP)
device = xstrdup(DEFAULT_TAP_DEVICE);
device = xstrdup(DEFAULT_TUN_DEVICE);
}
- if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
- iface = NULL;
-#ifndef TAPGIFNAME
- if (iface) {
- logger(DEBUG_ALWAYS, LOG_WARNING, "Ignoring specified interface name '%s' as device rename is not supported on this platform", iface);
- free(iface);
- iface = NULL;
- }
-#endif
- if (!iface)
- iface = xstrdup(strrchr(device, '/') ? strrchr(device, '/') + 1 : device);
+ // Open the device
switch(device_type) {
#ifdef ENABLE_TUNEMU
device_fd = tunemu_open(dynamic_name);
}
break;
+#endif
+#ifdef HAVE_NET_IF_UTUN_H
+ case DEVICE_TYPE_UTUN:
+ return setup_utun();
#endif
default:
device_fd = open(device, O_RDWR | O_NONBLOCK);
fcntl(device_fd, F_SETFD, FD_CLOEXEC);
#endif
+ // Guess what the corresponding interface is called
+
+ char *realname;
+
+#if defined(HAVE_FDEVNAME)
+ realname = fdevname(device_fd) ? : device;
+#elif defined(HAVE_DEVNAME)
+ struct stat buf;
+ if(!fstat(device_fd, &buf))
+ realname = devname(buf.st_rdev, S_IFCHR) ? : device;
+#else
+ realname = device;
+#endif
+
+ if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
+ iface = xstrdup(strrchr(realname, '/') ? strrchr(realname, '/') + 1 : realname);
+ else if(strcmp(iface, strrchr(realname, '/') ? strrchr(realname, '/') + 1 : realname))
+ logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: Interface does not match Device. $INTERFACE might be set incorrectly.");
+
+ // Configure the device as best as we can
+
switch(device_type) {
default:
device_type = DEVICE_TYPE_TUN;
#endif
}
+#ifdef SIOCGIFADDR
+ if(overwrite_mac)
+ ioctl(device_fd, SIOCGIFADDR, mymac.x);
+#endif
+
logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info);
return true;
packet->len = inlen + 14;
break;
+ case DEVICE_TYPE_UTUN:
case DEVICE_TYPE_TUNIFHEAD: {
- u_int32_t type;
- struct iovec vector[2] = {{&type, sizeof type}, {DATA(packet) + 14, MTU - 14}};
-
- if((inlen = readv(device_fd, vector, 2)) <= 0) {
+ if((inlen = read(device_fd, packet->data + 10, MTU - 10)) <= 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:
+ switch (packet->data[14] >> 4) {
+ case 4:
DATA(packet)[12] = 0x08;
DATA(packet)[13] = 0x00;
break;
- case AF_INET6:
+ case 6:
DATA(packet)[12] = 0x86;
DATA(packet)[13] = 0xDD;
break;
default:
logger(DEBUG_TRAFFIC, LOG_ERR,
- "Unknown address family %x while reading packet from %s %s",
- ntohl(type), device_info, device);
+ "Unknown IP version %d while reading packet from %s %s",
+ packet->data[14] >> 4, device_info, device);
return false;
}
}
break;
+ case DEVICE_TYPE_UTUN:
case DEVICE_TYPE_TUNIFHEAD: {
- u_int32_t type;
- struct iovec vector[2] = {{&type, sizeof type}, {DATA(packet) + 14, packet->len - 14}};
- int af;
-
- af = (DATA(packet)[12] << 8) + DATA(packet)[13];
+ int af = (DATA(packet)[12] << 8) + DATA(packet)[13];
+ uint32_t type;
switch (af) {
case 0x0800:
return false;
}
- if(writev(device_fd, vector, 2) < 0) {
+ memcpy(packet->data + 10, &type, sizeof type);
+
+ 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;
projects / tinc / blobdiff