Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
[qemu.git] / net / tap-bsd.c
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 "tap_int.h"
26 #include "qemu-common.h"
27 #include "sysemu/sysemu.h"
28 #include "qemu/error-report.h"
29
30 #ifdef __NetBSD__
31 #include <sys/ioctl.h>
32 #include <net/if.h>
33 #include <net/if_tap.h>
34 #endif
35
36 int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
37 int vnet_hdr_required, int mq_required)
38 {
39 int fd;
40 #ifdef TAPGIFNAME
41 struct ifreq ifr;
42 #else
43 char *dev;
44 struct stat s;
45 #endif
46
47 /* if no ifname is given, always start the search from tap0/tun0. */
48 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 {
55 #if defined(__OpenBSD__)
56 snprintf(dname, sizeof dname, "/dev/tun%d", i);
57 #else
58 snprintf(dname, sizeof dname, "/dev/tap%d", i);
59 #endif
60 }
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) {
73 error_report("warning: could not open %s (%s): no virtual network emulation",
74 dname, strerror(errno));
75 return -1;
76 }
77
78 #ifdef TAPGIFNAME
79 if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) {
80 fprintf(stderr, "warning: could not get tap name: %s\n",
81 strerror(errno));
82 return -1;
83 }
84 pstrcpy(ifname, ifname_size, ifr.ifr_name);
85 #else
86 if (fstat(fd, &s) < 0) {
87 fprintf(stderr,
88 "warning: could not stat /dev/tap: no virtual network emulation: %s\n",
89 strerror(errno));
90 return -1;
91 }
92 dev = devname(s.st_rdev, S_IFCHR);
93 pstrcpy(ifname, ifname_size, dev);
94 #endif
95
96 if (*vnet_hdr) {
97 /* BSD doesn't have IFF_VNET_HDR */
98 *vnet_hdr = 0;
99
100 if (vnet_hdr_required && !*vnet_hdr) {
101 error_report("vnet_hdr=1 requested, but no kernel "
102 "support for IFF_VNET_HDR available");
103 close(fd);
104 return -1;
105 }
106 }
107 fcntl(fd, F_SETFL, O_NONBLOCK);
108 return fd;
109 }
110
111 int tap_set_sndbuf(int fd, const NetdevTapOptions *tap)
112 {
113 return 0;
114 }
115
116 int tap_probe_vnet_hdr(int fd)
117 {
118 return 0;
119 }
120
121 int tap_probe_has_ufo(int fd)
122 {
123 return 0;
124 }
125
126 int tap_probe_vnet_hdr_len(int fd, int len)
127 {
128 return 0;
129 }
130
131 void tap_fd_set_vnet_hdr_len(int fd, int len)
132 {
133 }
134
135 void tap_fd_set_offload(int fd, int csum, int tso4,
136 int tso6, int ecn, int ufo)
137 {
138 }
139
140 int tap_fd_enable(int fd)
141 {
142 return -1;
143 }
144
145 int tap_fd_disable(int fd)
146 {
147 return -1;
148 }
149
150 int tap_fd_get_ifname(int fd, char *ifname)
151 {
152 return -1;
153 }