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1/*
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
25#include "net/tap.h"
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26#include "qemu-common.h"
27#include "sysemu.h"
73d96e29 28#include "qemu-error.h"
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29
30#ifdef __NetBSD__
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31#include <sys/ioctl.h>
32#include <net/if.h>
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33#include <net/if_tap.h>
34#endif
35
a167ba50 36#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
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37#include <libutil.h>
38#else
39#include <util.h>
40#endif
e7e92325 41
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42int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required)
43{
44 int fd;
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45#ifdef TAPGIFNAME
46 struct ifreq ifr;
47#else
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48 char *dev;
49 struct stat s;
45c245bf 50#endif
e7e92325 51
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52#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
53 /* if no ifname is given, always start the search from tap0/tun0. */
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54 int i;
55 char dname[100];
56
57 for (i = 0; i < 10; i++) {
58 if (*ifname) {
59 snprintf(dname, sizeof dname, "/dev/%s", ifname);
60 } else {
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61#if defined(__OpenBSD__)
62 snprintf(dname, sizeof dname, "/dev/tun%d", i);
63#else
2f859a3c 64 snprintf(dname, sizeof dname, "/dev/tap%d", i);
5f668643 65#endif
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66 }
67 TFR(fd = open(dname, O_RDWR));
68 if (fd >= 0) {
69 break;
70 }
71 else if (errno == ENXIO || errno == ENOENT) {
72 break;
73 }
74 if (*ifname) {
75 break;
76 }
77 }
78 if (fd < 0) {
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79 error_report("warning: could not open %s (%s): no virtual network emulation",
80 dname, strerror(errno));
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81 return -1;
82 }
83#else
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84 TFR(fd = open("/dev/tap", O_RDWR));
85 if (fd < 0) {
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86 fprintf(stderr,
87 "warning: could not open /dev/tap: no virtual network emulation: %s\n",
88 strerror(errno));
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89 return -1;
90 }
2f859a3c 91#endif
e7e92325 92
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93#ifdef TAPGIFNAME
94 if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) {
95 fprintf(stderr, "warning: could not get tap name: %s\n",
96 strerror(errno));
97 return -1;
98 }
99 pstrcpy(ifname, ifname_size, ifr.ifr_name);
100#else
101 if (fstat(fd, &s) < 0) {
102 fprintf(stderr,
103 "warning: could not stat /dev/tap: no virtual network emulation: %s\n",
104 strerror(errno));
105 return -1;
106 }
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107 dev = devname(s.st_rdev, S_IFCHR);
108 pstrcpy(ifname, ifname_size, dev);
45c245bf 109#endif
e7e92325 110
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111 if (*vnet_hdr) {
112 /* BSD doesn't have IFF_VNET_HDR */
113 *vnet_hdr = 0;
114
115 if (vnet_hdr_required && !*vnet_hdr) {
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116 error_report("vnet_hdr=1 requested, but no kernel "
117 "support for IFF_VNET_HDR available");
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118 close(fd);
119 return -1;
120 }
121 }
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122 fcntl(fd, F_SETFL, O_NONBLOCK);
123 return fd;
124}
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125
126int tap_set_sndbuf(int fd, QemuOpts *opts)
127{
128 return 0;
129}
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130
131int tap_probe_vnet_hdr(int fd)
132{
133 return 0;
134}
1faac1f7 135
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136int tap_probe_has_ufo(int fd)
137{
138 return 0;
139}
140
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141int tap_probe_vnet_hdr_len(int fd, int len)
142{
143 return 0;
144}
145
146void tap_fd_set_vnet_hdr_len(int fd, int len)
147{
148}
149
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150void tap_fd_set_offload(int fd, int csum, int tso4,
151 int tso6, int ecn, int ufo)
152{
153}