/*
* QEMU System Emulator
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qapi/error.h"
#include "tap_int.h"
#include "qemu/cutils.h"
#include "qemu/error-report.h"
#if defined(__NetBSD__) || defined(__FreeBSD__)
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_tap.h>
#endif
#if defined(__OpenBSD__)
#include <sys/param.h>
#endif
#ifndef __FreeBSD__
int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
int vnet_hdr_required, int mq_required, Error **errp)
{
int fd;
#ifdef TAPGIFNAME
struct ifreq ifr;
#else
char *dev;
struct stat s;
#endif
/* if no ifname is given, always start the search from tap0/tun0. */
int i;
char dname[100];
for (i = 0; i < 10; i++) {
if (*ifname) {
snprintf(dname, sizeof dname, "/dev/%s", ifname);
} else {
#if defined(__OpenBSD__) && OpenBSD < 201605
snprintf(dname, sizeof dname, "/dev/tun%d", i);
#else
snprintf(dname, sizeof dname, "/dev/tap%d", i);
#endif
}
TFR(fd = open(dname, O_RDWR));
if (fd >= 0) {
break;
}
else if (errno == ENXIO || errno == ENOENT) {
break;
}
if (*ifname) {
break;
}
}
if (fd < 0) {
error_setg_errno(errp, errno, "could not open %s", dname);
return -1;
}
#ifdef TAPGIFNAME
if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) {
error_setg_errno(errp, errno, "could not get tap name");
return -1;
}
pstrcpy(ifname, ifname_size, ifr.ifr_name);
#else
if (fstat(fd, &s) < 0) {
error_setg_errno(errp, errno, "could not stat %s", dname);
return -1;
}
dev = devname(s.st_rdev, S_IFCHR);
pstrcpy(ifname, ifname_size, dev);
#endif
if (*vnet_hdr) {
/* BSD doesn't have IFF_VNET_HDR */
*vnet_hdr = 0;
if (vnet_hdr_required && !*vnet_hdr) {
error_setg(errp, "vnet_hdr=1 requested, but no kernel "
"support for IFF_VNET_HDR available");
close(fd);
return -1;
}
}
fcntl(fd, F_SETFL, O_NONBLOCK);
return fd;
}
#else /* __FreeBSD__ */
#define PATH_NET_TAP "/dev/tap"
static int tap_open_clone(char *ifname, int ifname_size, Error **errp)
{
int fd, s, ret;
struct ifreq ifr;
TFR(fd = open(PATH_NET_TAP, O_RDWR));
if (fd < 0) {
error_setg_errno(errp, errno, "could not open %s", PATH_NET_TAP);
return -1;
}
memset(&ifr, 0, sizeof(ifr));
ret = ioctl(fd, TAPGIFNAME, (void *)&ifr);
if (ret < 0) {
error_setg_errno(errp, errno, "could not get tap interface name");
close(fd);
return -1;
}
if (ifname[0] != '\0') {
/* User requested the interface to have a specific name */
s = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (s < 0) {
error_setg_errno(errp, errno,
"could not open socket to set interface name");
close(fd);
return -1;
}
ifr.ifr_data = ifname;
ret = ioctl(s, SIOCSIFNAME, (void *)&ifr);
close(s);
if (ret < 0) {
error_setg(errp, "could not set tap interface name");
close(fd);
return -1;
}
} else {
pstrcpy(ifname, ifname_size, ifr.ifr_name);
}
return fd;
}
int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
int vnet_hdr_required, int mq_required, Error **errp)
{
int fd = -1;
/* If the specified tap device already exists just use it. */
if (ifname[0] != '\0') {
char dname[100];
snprintf(dname, sizeof dname, "/dev/%s", ifname);
TFR(fd = open(dname, O_RDWR));
if (fd < 0 && errno != ENOENT) {
error_setg_errno(errp, errno, "could not open %s", dname);
return -1;
}
}
if (fd < 0) {
/* Tap device not specified or does not exist. */
if ((fd = tap_open_clone(ifname, ifname_size, errp)) < 0) {
return -1;
}
}
if (*vnet_hdr) {
/* BSD doesn't have IFF_VNET_HDR */
*vnet_hdr = 0;
if (vnet_hdr_required && !*vnet_hdr) {
error_setg(errp, "vnet_hdr=1 requested, but no kernel "
"support for IFF_VNET_HDR available");
goto error;
}
}
if (mq_required) {
error_setg(errp, "mq_required requested, but no kernel support"
" for IFF_MULTI_QUEUE available");
goto error;
}
fcntl(fd, F_SETFL, O_NONBLOCK);
return fd;
error:
close(fd);
return -1;
}
#endif /* __FreeBSD__ */
void tap_set_sndbuf(int fd, const NetdevTapOptions *tap, Error **errp)
{
}
int tap_probe_vnet_hdr(int fd, Error **errp)
{
return 0;
}
int tap_probe_has_ufo(int fd)
{
return 0;
}
int tap_probe_vnet_hdr_len(int fd, int len)
{
return 0;
}
void tap_fd_set_vnet_hdr_len(int fd, int len)
{
}
int tap_fd_set_vnet_le(int fd, int is_le)
{
return -EINVAL;
}
int tap_fd_set_vnet_be(int fd, int is_be)
{
return -EINVAL;
}
void tap_fd_set_offload(int fd, int csum, int tso4,
int tso6, int ecn, int ufo)
{
}
int tap_fd_enable(int fd)
{
return -1;
}
int tap_fd_disable(int fd)
{
return -1;
}
int tap_fd_get_ifname(int fd, char *ifname)
{
return -1;
}
