blob: 01c705b4c03c891b2882de809ece9049a7a1ef48 [file] [log] [blame]
Mark McLoughline7e92322009-10-22 17:49:08 +01001/*
2 * QEMU System Emulator
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
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:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
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
22 * THE SOFTWARE.
23 */
24
Paolo Bonzini1422e322012-10-24 08:43:34 +020025#include "tap_int.h"
Alexander Graf71f4eff2009-10-30 22:27:00 +010026#include "qemu-common.h"
Paolo Bonzini9c17d612012-12-17 18:20:04 +010027#include "sysemu/sysemu.h"
Paolo Bonzini1de7afc2012-12-17 18:20:00 +010028#include "qemu/error-report.h"
Mark McLoughline7e92322009-10-22 17:49:08 +010029
30#ifdef __NetBSD__
Manuel Bouyer45c245b2011-08-07 09:48:59 +000031#include <sys/ioctl.h>
32#include <net/if.h>
Mark McLoughline7e92322009-10-22 17:49:08 +010033#include <net/if_tap.h>
34#endif
35
Mark McLoughline7e92322009-10-22 17:49:08 +010036int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required)
37{
38 int fd;
Manuel Bouyer45c245b2011-08-07 09:48:59 +000039#ifdef TAPGIFNAME
40 struct ifreq ifr;
41#else
Mark McLoughline7e92322009-10-22 17:49:08 +010042 char *dev;
43 struct stat s;
Manuel Bouyer45c245b2011-08-07 09:48:59 +000044#endif
Mark McLoughline7e92322009-10-22 17:49:08 +010045
Brad5f668642010-12-20 21:23:15 -050046#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
47 /* if no ifname is given, always start the search from tap0/tun0. */
Juergen Lock2f859a32009-11-20 23:31:55 +010048 int i;
49 char dname[100];
50
51 for (i = 0; i < 10; i++) {
52 if (*ifname) {
53 snprintf(dname, sizeof dname, "/dev/%s", ifname);
54 } else {
Brad5f668642010-12-20 21:23:15 -050055#if defined(__OpenBSD__)
56 snprintf(dname, sizeof dname, "/dev/tun%d", i);
57#else
Juergen Lock2f859a32009-11-20 23:31:55 +010058 snprintf(dname, sizeof dname, "/dev/tap%d", i);
Brad5f668642010-12-20 21:23:15 -050059#endif
Juergen Lock2f859a32009-11-20 23:31:55 +010060 }
61 TFR(fd = open(dname, O_RDWR));
62 if (fd >= 0) {
63 break;
64 }
65 else if (errno == ENXIO || errno == ENOENT) {
66 break;
67 }
68 if (*ifname) {
69 break;
70 }
71 }
72 if (fd < 0) {
Markus Armbruster1ecda022010-02-18 17:25:24 +010073 error_report("warning: could not open %s (%s): no virtual network emulation",
74 dname, strerror(errno));
Juergen Lock2f859a32009-11-20 23:31:55 +010075 return -1;
76 }
77#else
Mark McLoughline7e92322009-10-22 17:49:08 +010078 TFR(fd = open("/dev/tap", O_RDWR));
79 if (fd < 0) {
Manuel Bouyer45c245b2011-08-07 09:48:59 +000080 fprintf(stderr,
81 "warning: could not open /dev/tap: no virtual network emulation: %s\n",
82 strerror(errno));
Mark McLoughline7e92322009-10-22 17:49:08 +010083 return -1;
84 }
Juergen Lock2f859a32009-11-20 23:31:55 +010085#endif
Mark McLoughline7e92322009-10-22 17:49:08 +010086
Manuel Bouyer45c245b2011-08-07 09:48:59 +000087#ifdef TAPGIFNAME
88 if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) {
89 fprintf(stderr, "warning: could not get tap name: %s\n",
90 strerror(errno));
91 return -1;
92 }
93 pstrcpy(ifname, ifname_size, ifr.ifr_name);
94#else
95 if (fstat(fd, &s) < 0) {
96 fprintf(stderr,
97 "warning: could not stat /dev/tap: no virtual network emulation: %s\n",
98 strerror(errno));
99 return -1;
100 }
Mark McLoughline7e92322009-10-22 17:49:08 +0100101 dev = devname(s.st_rdev, S_IFCHR);
102 pstrcpy(ifname, ifname_size, dev);
Manuel Bouyer45c245b2011-08-07 09:48:59 +0000103#endif
Mark McLoughline7e92322009-10-22 17:49:08 +0100104
Juergen Lock39ca4c02009-11-20 23:19:53 +0100105 if (*vnet_hdr) {
106 /* BSD doesn't have IFF_VNET_HDR */
107 *vnet_hdr = 0;
108
109 if (vnet_hdr_required && !*vnet_hdr) {
Markus Armbruster1ecda022010-02-18 17:25:24 +0100110 error_report("vnet_hdr=1 requested, but no kernel "
111 "support for IFF_VNET_HDR available");
Juergen Lock39ca4c02009-11-20 23:19:53 +0100112 close(fd);
113 return -1;
114 }
115 }
Mark McLoughline7e92322009-10-22 17:49:08 +0100116 fcntl(fd, F_SETFL, O_NONBLOCK);
117 return fd;
118}
Mark McLoughlin15ac9132009-10-22 17:49:13 +0100119
Laszlo Ersek08c573a2012-07-17 16:17:19 +0200120int tap_set_sndbuf(int fd, const NetdevTapOptions *tap)
Mark McLoughlin15ac9132009-10-22 17:49:13 +0100121{
122 return 0;
123}
Mark McLoughlindc690042009-10-22 17:49:14 +0100124
125int tap_probe_vnet_hdr(int fd)
126{
127 return 0;
128}
Mark McLoughlin1faac1f2009-10-22 17:49:15 +0100129
Mark McLoughlin9c282712009-10-22 17:49:16 +0100130int tap_probe_has_ufo(int fd)
131{
132 return 0;
133}
134
Michael S. Tsirkin445d8922010-07-16 11:16:06 +0300135int tap_probe_vnet_hdr_len(int fd, int len)
136{
137 return 0;
138}
139
140void tap_fd_set_vnet_hdr_len(int fd, int len)
141{
142}
143
Mark McLoughlin1faac1f2009-10-22 17:49:15 +0100144void tap_fd_set_offload(int fd, int csum, int tso4,
145 int tso6, int ecn, int ufo)
146{
147}