mirror of https://gitee.com/openkylin/qemu.git
123 lines
3.2 KiB
C
123 lines
3.2 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 "net/tap.h"
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#include "qemu-common.h"
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#include "sysemu.h"
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#include "qemu-error.h"
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#ifdef __NetBSD__
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#include <net/if_tap.h>
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#endif
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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
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#include <libutil.h>
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#else
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#include <util.h>
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#endif
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#if defined(__OpenBSD__)
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#include <util.h>
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#endif
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int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required)
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{
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int fd;
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char *dev;
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struct stat s;
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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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/* if no ifname is given, always start the search from tap0. */
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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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snprintf(dname, sizeof dname, "/dev/tap%d", i);
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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_report("warning: could not open %s (%s): no virtual network emulation",
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dname, strerror(errno));
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return -1;
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}
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#else
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TFR(fd = open("/dev/tap", O_RDWR));
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if (fd < 0) {
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fprintf(stderr, "warning: could not open /dev/tap: no virtual network emulation\n");
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return -1;
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}
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#endif
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fstat(fd, &s);
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dev = devname(s.st_rdev, S_IFCHR);
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pstrcpy(ifname, ifname_size, dev);
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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_report("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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int tap_set_sndbuf(int fd, QemuOpts *opts)
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{
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return 0;
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}
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int tap_probe_vnet_hdr(int fd)
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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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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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