/*
device.c -- Interaction with Solaris tun device
Copyright (C) 2001-2005 Ivo Timmermans,
- 2001-2012 Guus Sliepen <guus@tinc-vpn.org>
+ 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ 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
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
+
#include "../system.h"
#include <sys/stropts.h>
#include <sys/sockio.h>
-#include <net/if_tun.h>
#include "../conf.h"
#include "../device.h"
#include "../logger.h"
#include "../net.h"
+#include "../route.h"
#include "../utils.h"
#include "../xalloc.h"
-#define DEFAULT_DEVICE "/dev/tun"
+#define DEFAULT_TUN_DEVICE "/dev/tun"
+#define DEFAULT_TAP_DEVICE "/dev/tap"
+
+static enum {
+ DEVICE_TYPE_TUN,
+ DEVICE_TYPE_TAP,
+} device_type = DEVICE_TYPE_TUN;
int device_fd = -1;
-static int ip_fd = -1, if_fd = -1;
+static int if_fd = -1;
+static int ip_fd = -1;
+static int arp_fd = -1;
char *device = NULL;
char *iface = NULL;
static char *device_info = NULL;
-static uint64_t device_total_in = 0;
-static uint64_t device_total_out = 0;
+uint64_t device_total_in = 0;
+uint64_t device_total_out = 0;
static bool setup_device(void) {
- int ppa;
- char *ptr;
-
- if(!get_config_string(lookup_config(config_tree, "Device"), &device))
- device = xstrdup(DEFAULT_DEVICE);
+ char *type;
- if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
- logger(LOG_ERR, "Could not open %s: %s", device, strerror(errno));
- return false;
+ 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);
}
-#ifdef FD_CLOEXEC
- fcntl(device_fd, F_SETFD, FD_CLOEXEC);
-#endif
+ if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
+ if(!strcasecmp(type, "tun"))
+ /* use default */;
+ else if(!strcasecmp(type, "tap"))
+ device_type = DEVICE_TYPE_TAP;
+ else {
+ logger(LOG_ERR, "Unknown device type %s!", type);
+ return false;
+ }
+ } else {
+ if(strstr(device, "tap") || routing_mode != RMODE_ROUTER)
+ device_type = DEVICE_TYPE_TAP;
+ }
- ppa = 0;
+ if(device_type == DEVICE_TYPE_TUN)
+ device_info = "Solaris tun device";
+ else
+ device_info = "Solaris tap device";
- ptr = device;
- while(*ptr && !isdigit((int) *ptr))
- ptr++;
- ppa = atoi(ptr);
+ /* The following is black magic copied from OpenVPN. */
if((ip_fd = open("/dev/ip", O_RDWR, 0)) < 0) {
- logger(LOG_ERR, "Could not open /dev/ip: %s", strerror(errno));
+ logger(LOG_ERR, "Could not open %s: %s\n", "/dev/ip", strerror(errno));
return false;
}
-#ifdef FD_CLOEXEC
- fcntl(ip_fd, F_SETFD, FD_CLOEXEC);
-#endif
+ if((device_fd = open(device, O_RDWR, 0)) < 0) {
+ logger(LOG_ERR, "Could not open %s: %s\n", device, strerror(errno));
+ return false;
+ }
+
+ /* Get unit number. */
+
+ char *ptr = device;
+ get_config_string(lookup_config(config_tree, "Interface"), &ptr);
+
+ while(*ptr && !isdigit(*ptr))
+ ptr++;
+ int ppa = atoi(ptr);
/* Assign a new PPA and get its unit number. */
- if((ppa = ioctl(device_fd, TUNNEWPPA, ppa)) < 0) {
- logger(LOG_ERR, "Can't assign new interface: %s", strerror(errno));
- return false;
+
+ struct strioctl strioc_ppa = {
+ .ic_cmd = TUNNEWPPA,
+ .ic_len = sizeof ppa,
+ .ic_dp = (char *)&ppa,
+ };
+
+ if(!*ptr) { /* no number given, try dynamic */
+ bool found = false;
+ while(!found && ppa < 64) {
+ int new_ppa = ioctl(device_fd, I_STR, &strioc_ppa);
+ if(new_ppa >= 0) {
+ ppa = new_ppa;
+ found = true;
+ break;
+ }
+ ppa++;
+ }
+ if(!found) {
+ logger(LOG_ERR, "Could not find free PPA for %s %s!", device_info, device);
+ return false;
+ }
+ } else { /* try this particular one */
+ if((ppa = ioctl(device_fd, I_STR, &strioc_ppa)) < 0) {
+ logger(LOG_ERR, "Could not assign PPA %d for %s %s!", ppa, device_info, device);
+ return false;
+ }
}
if((if_fd = open(device, O_RDWR, 0)) < 0) {
- logger(LOG_ERR, "Could not open %s twice: %s", device,
- strerror(errno));
+ logger(LOG_ERR, "Could not open %s: %s\n", device, strerror(errno));
return false;
}
-#ifdef FD_CLOEXEC
- fcntl(if_fd, F_SETFD, FD_CLOEXEC);
-#endif
-
if(ioctl(if_fd, I_PUSH, "ip") < 0) {
- logger(LOG_ERR, "Can't push IP module: %s", strerror(errno));
+ logger(LOG_ERR, "Could not push IP module onto %s %s!", device_info, device);
return false;
}
- /* Assign ppa according to the unit number returned by tun device */
- if(ioctl(if_fd, IF_UNITSEL, (char *) &ppa) < 0) {
- logger(LOG_ERR, "Can't set PPA %d: %s", ppa, strerror(errno));
+ xasprintf(&iface, "%s%d", device_type == DEVICE_TYPE_TUN ? "tun" : "tap", ppa);
+
+ {
+ /* Remove muxes just in case they are left over from a crashed tincd */
+ struct lifreq ifr = {};
+ strncpy(ifr.lifr_name, iface, sizeof ifr.lifr_name);
+ if(ioctl(ip_fd, SIOCGLIFMUXID, &ifr) >= 0) {
+ int muxid = ifr.lifr_arp_muxid;
+ ioctl(ip_fd, I_PUNLINK, muxid);
+ muxid = ifr.lifr_ip_muxid;
+ ioctl(ip_fd, I_PUNLINK, muxid);
+ }
+ }
+
+ if(device_type == DEVICE_TYPE_TUN) {
+ /* Assign ppa according to the unit number returned by tun device */
+ if(ioctl(if_fd, IF_UNITSEL, (char *)&ppa) < 0) {
+ logger(LOG_ERR, "Could not set PPA %d on %s %s!", ppa, device_info, device);
+ return false;
+ }
+ }
+
+ int arp_fd = -1;
+
+ if(device_type == DEVICE_TYPE_TAP) {
+ struct lifreq ifr = {};
+
+ if(ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0) {
+ logger(LOG_ERR, "Could not set flags on %s %s!", device_info, device);
+ return false;
+ }
+
+ strncpy(ifr.lifr_name, iface, sizeof(ifr.lifr_name));
+ ifr.lifr_ppa = ppa;
+
+ /* Assign ppa according to the unit number returned by tun device */
+ if(ioctl(if_fd, SIOCSLIFNAME, &ifr) < 0) {
+ logger(LOG_ERR, "Could not set PPA %d on %s %s!", ppa, device_info, device);
+ return false;
+ }
+ if(ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0) {
+ logger(LOG_ERR, "Could not set flags on %s %s!", device_info, device);
+ return false;
+ }
+
+ /* Push arp module to if_fd */
+ if(ioctl(if_fd, I_PUSH, "arp") < 0) {
+ logger(LOG_ERR, "Could not push ARP module onto %s %s!", device_info, device);
+ return false;
+ }
+
+ /* Pop any modules on the stream */
+ while(true) {
+ if(ioctl(ip_fd, I_POP, NULL) < 0)
+ break;
+ }
+
+ /* Push arp module to ip_fd */
+ if(ioctl(ip_fd, I_PUSH, "arp") < 0) {
+ logger(LOG_ERR, "Could not push ARP module onto %s!", "/dev/ip");
+ return false;
+ }
+
+ /* Open arp_fd */
+ if((arp_fd = open(device, O_RDWR, 0)) < 0) {
+ logger(LOG_ERR, "Could not open %s: %s\n", device, strerror(errno));
+ return false;
+ }
+
+ /* Push arp module to arp_fd */
+ if(ioctl(arp_fd, I_PUSH, "arp") < 0) {
+ logger(LOG_ERR, "Could not push ARP module onto %s %s!", device_info, device);
+ return false;
+ }
+
+ /* Set ifname to arp */
+ struct strioctl strioc_if = {
+ .ic_cmd = SIOCSLIFNAME,
+ .ic_len = sizeof ifr,
+ .ic_dp = (char *)&ifr,
+ };
+
+ if(ioctl(arp_fd, I_STR, &strioc_if) < 0) {
+ logger(LOG_ERR, "Could not set ifname to %s %s", device_info, device);
+ return false;
+ }
+ }
+
+ int ip_muxid, arp_muxid;
+
+ if((ip_muxid = ioctl(ip_fd, I_PLINK, if_fd)) < 0) {
+ logger(LOG_ERR, "Could not link %s %s to IP", device_info, device);
return false;
}
- if(ioctl(ip_fd, I_LINK, if_fd) < 0) {
- logger(LOG_ERR, "Can't link TUN device to IP: %s", strerror(errno));
+ if(device_type == DEVICE_TYPE_TAP) {
+ if((arp_muxid = ioctl(ip_fd, I_PLINK, arp_fd)) < 0) {
+ logger(LOG_ERR, "Could not link %s %s to ARP", device_info, device);
+ return false;
+ }
+ close(arp_fd);
+ }
+
+ struct lifreq ifr = {};
+ strncpy(ifr.lifr_name, iface, sizeof(ifr.lifr_name));
+ ifr.lifr_ip_muxid = ip_muxid;
+ if(device_type == DEVICE_TYPE_TAP) {
+ ifr.lifr_arp_muxid = arp_muxid;
+ }
+
+ if(ioctl(ip_fd, SIOCSLIFMUXID, &ifr) < 0) {
+ if(device_type == DEVICE_TYPE_TAP) {
+ ioctl(ip_fd, I_PUNLINK, arp_muxid);
+ }
+ ioctl(ip_fd, I_PUNLINK, ip_muxid);
+ logger(LOG_ERR, "Could not set multiplexor id for %s %s", device_info, device);
return false;
}
- if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
- xasprintf(&iface, "tun%d", ppa);
+ close(if_fd);
- device_info = "Solaris tun device";
+#ifdef FD_CLOEXEC
+ fcntl(device_fd, F_SETFD, FD_CLOEXEC);
+ fcntl(ip_fd, F_SETFD, FD_CLOEXEC);
+#endif
logger(LOG_INFO, "%s is a %s", device, device_info);
}
static void close_device(void) {
- close(if_fd);
+ if(iface) {
+ struct lifreq ifr = {};
+ strncpy(ifr.lifr_name, iface, sizeof ifr.lifr_name);
+ if(ioctl(ip_fd, SIOCGLIFMUXID, &ifr) >= 0) {
+ int muxid = ifr.lifr_arp_muxid;
+ ioctl(ip_fd, I_PUNLINK, muxid);
+ muxid = ifr.lifr_ip_muxid;
+ ioctl(ip_fd, I_PUNLINK, muxid);
+ }
+ }
+
close(ip_fd);
close(device_fd);
}
static bool read_packet(vpn_packet_t *packet) {
- int lenin;
+ int inlen;
+
+ switch(device_type) {
+ case DEVICE_TYPE_TUN:
+ if((inlen = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
+ logger(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;
- if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
- logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
- device, strerror(errno));
- return false;
- }
+ case DEVICE_TYPE_TAP:
+ if((inlen = read(device_fd, packet->data, MTU)) <= 0) {
+ logger(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;
+ packet->len = inlen + 14;
break;
+
default:
- ifdebug(TRAFFIC) logger(LOG_ERR,
- "Unknown IP version %d while reading packet from %s %s",
- packet->data[14] >> 4, device_info, device);
- return false;
+ abort();
}
- memset(packet->data, 0, 12);
- packet->len = lenin + 14;
-
device_total_in += packet->len;
- 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:
+ if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
+ logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
+ return false;
+ }
+ break;
- if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
- logger(LOG_ERR, "Can't write to %s %s: %s", device_info,
- device, strerror(errno));
- return false;
+ 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;
+
+ default:
+ abort();
}
device_total_out += packet->len;
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