qdev: remove baked in notion of aliases (v2)
[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 "net/tap.h"
26 #include "qemu-common.h"
27 #include "sysemu.h"
28 #include "qemu-error.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 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
37 #include <libutil.h>
38 #else
39 #include <util.h>
40 #endif
41
42 int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required)
43 {
44 int fd;
45 #ifdef TAPGIFNAME
46 struct ifreq ifr;
47 #else
48 char *dev;
49 struct stat s;
50 #endif
51
52 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
53 /* if no ifname is given, always start the search from tap0/tun0. */
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 {
61 #if defined(__OpenBSD__)
62 snprintf(dname, sizeof dname, "/dev/tun%d", i);
63 #else
64 snprintf(dname, sizeof dname, "/dev/tap%d", i);
65 #endif
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) {
79 error_report("warning: could not open %s (%s): no virtual network emulation",
80 dname, strerror(errno));
81 return -1;
82 }
83 #else
84 TFR(fd = open("/dev/tap", O_RDWR));
85 if (fd < 0) {
86 fprintf(stderr,
87 "warning: could not open /dev/tap: no virtual network emulation: %s\n",
88 strerror(errno));
89 return -1;
90 }
91 #endif
92
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 }
107 dev = devname(s.st_rdev, S_IFCHR);
108 pstrcpy(ifname, ifname_size, dev);
109 #endif
110
111 if (*vnet_hdr) {
112 /* BSD doesn't have IFF_VNET_HDR */
113 *vnet_hdr = 0;
114
115 if (vnet_hdr_required && !*vnet_hdr) {
116 error_report("vnet_hdr=1 requested, but no kernel "
117 "support for IFF_VNET_HDR available");
118 close(fd);
119 return -1;
120 }
121 }
122 fcntl(fd, F_SETFL, O_NONBLOCK);
123 return fd;
124 }
125
126 int tap_set_sndbuf(int fd, QemuOpts *opts)
127 {
128 return 0;
129 }
130
131 int tap_probe_vnet_hdr(int fd)
132 {
133 return 0;
134 }
135
136 int tap_probe_has_ufo(int fd)
137 {
138 return 0;
139 }
140
141 int tap_probe_vnet_hdr_len(int fd, int len)
142 {
143 return 0;
144 }
145
146 void tap_fd_set_vnet_hdr_len(int fd, int len)
147 {
148 }
149
150 void tap_fd_set_offload(int fd, int csum, int tso4,
151 int tso6, int ecn, int ufo)
152 {
153 }