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