4 * Copyright (c) 2003-2008 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 #include "qemu/osdep.h"
26 #include "qapi/error.h"
28 #include "qemu/cutils.h"
29 #include "sysemu/sysemu.h"
30 #include "qemu/error-report.h"
32 #if defined(__NetBSD__) || defined(__FreeBSD__)
33 #include <sys/ioctl.h>
35 #include <net/if_tap.h>
39 int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
40 int vnet_hdr_required, int mq_required, Error **errp)
50 /* if no ifname is given, always start the search from tap0/tun0. */
54 for (i = 0; i < 10; i++) {
56 snprintf(dname, sizeof dname, "/dev/%s", ifname);
58 #if defined(__OpenBSD__)
59 snprintf(dname, sizeof dname, "/dev/tun%d", i);
61 snprintf(dname, sizeof dname, "/dev/tap%d", i);
64 TFR(fd = open(dname, O_RDWR));
68 else if (errno == ENXIO || errno == ENOENT) {
76 error_setg_errno(errp, errno, "could not open %s", dname);
81 if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) {
82 error_setg_errno(errp, errno, "could not get tap name");
85 pstrcpy(ifname, ifname_size, ifr.ifr_name);
87 if (fstat(fd, &s) < 0) {
88 error_setg_errno(errp, errno, "could not stat %s", dname);
91 dev = devname(s.st_rdev, S_IFCHR);
92 pstrcpy(ifname, ifname_size, dev);
96 /* BSD doesn't have IFF_VNET_HDR */
99 if (vnet_hdr_required && !*vnet_hdr) {
100 error_setg(errp, "vnet_hdr=1 requested, but no kernel "
101 "support for IFF_VNET_HDR available");
106 fcntl(fd, F_SETFL, O_NONBLOCK);
110 #else /* __FreeBSD__ */
112 #define PATH_NET_TAP "/dev/tap"
114 static int tap_open_clone(char *ifname, int ifname_size, Error **errp)
119 TFR(fd = open(PATH_NET_TAP, O_RDWR));
121 error_setg_errno(errp, errno, "could not open %s", PATH_NET_TAP);
125 memset(&ifr, 0, sizeof(ifr));
127 ret = ioctl(fd, TAPGIFNAME, (void *)&ifr);
129 error_setg_errno(errp, errno, "could not get tap interface name");
134 if (ifname[0] != '\0') {
135 /* User requested the interface to have a specific name */
136 s = socket(AF_LOCAL, SOCK_DGRAM, 0);
138 error_setg_errno(errp, errno,
139 "could not open socket to set interface name");
143 ifr.ifr_data = ifname;
144 ret = ioctl(s, SIOCSIFNAME, (void *)&ifr);
147 error_setg(errp, "could not set tap interface name");
152 pstrcpy(ifname, ifname_size, ifr.ifr_name);
158 int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
159 int vnet_hdr_required, int mq_required, Error **errp)
163 /* If the specified tap device already exists just use it. */
164 if (ifname[0] != '\0') {
166 snprintf(dname, sizeof dname, "/dev/%s", ifname);
167 TFR(fd = open(dname, O_RDWR));
168 if (fd < 0 && errno != ENOENT) {
169 error_setg_errno(errp, errno, "could not open %s", dname);
175 /* Tap device not specified or does not exist. */
176 if ((fd = tap_open_clone(ifname, ifname_size, errp)) < 0) {
182 /* BSD doesn't have IFF_VNET_HDR */
185 if (vnet_hdr_required && !*vnet_hdr) {
186 error_setg(errp, "vnet_hdr=1 requested, but no kernel "
187 "support for IFF_VNET_HDR available");
192 error_setg(errp, "mq_required requested, but no kernel support"
193 " for IFF_MULTI_QUEUE available");
197 fcntl(fd, F_SETFL, O_NONBLOCK);
204 #endif /* __FreeBSD__ */
206 void tap_set_sndbuf(int fd, const NetdevTapOptions *tap, Error **errp)
210 int tap_probe_vnet_hdr(int fd)
215 int tap_probe_has_ufo(int fd)
220 int tap_probe_vnet_hdr_len(int fd, int len)
225 void tap_fd_set_vnet_hdr_len(int fd, int len)
229 int tap_fd_set_vnet_le(int fd, int is_le)
234 int tap_fd_set_vnet_be(int fd, int is_be)
239 void tap_fd_set_offload(int fd, int csum, int tso4,
240 int tso6, int ecn, int ufo)
244 int tap_fd_enable(int fd)
249 int tap_fd_disable(int fd)
254 int tap_fd_get_ifname(int fd, char *ifname)