root / net / tap-bsd.c @ 9c17d615
History | View | Annotate | Download (3.9 kB)
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, int vnet_hdr_required) |
37 |
{ |
38 |
int fd;
|
39 |
#ifdef TAPGIFNAME
|
40 |
struct ifreq ifr;
|
41 |
#else
|
42 |
char *dev;
|
43 |
struct stat s;
|
44 |
#endif
|
45 |
|
46 |
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
|
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 |
#else
|
78 |
TFR(fd = open("/dev/tap", O_RDWR));
|
79 |
if (fd < 0) { |
80 |
fprintf(stderr, |
81 |
"warning: could not open /dev/tap: no virtual network emulation: %s\n",
|
82 |
strerror(errno)); |
83 |
return -1; |
84 |
} |
85 |
#endif
|
86 |
|
87 |
#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 |
} |
101 |
dev = devname(s.st_rdev, S_IFCHR); |
102 |
pstrcpy(ifname, ifname_size, dev); |
103 |
#endif
|
104 |
|
105 |
if (*vnet_hdr) {
|
106 |
/* BSD doesn't have IFF_VNET_HDR */
|
107 |
*vnet_hdr = 0;
|
108 |
|
109 |
if (vnet_hdr_required && !*vnet_hdr) {
|
110 |
error_report("vnet_hdr=1 requested, but no kernel "
|
111 |
"support for IFF_VNET_HDR available");
|
112 |
close(fd); |
113 |
return -1; |
114 |
} |
115 |
} |
116 |
fcntl(fd, F_SETFL, O_NONBLOCK); |
117 |
return fd;
|
118 |
} |
119 |
|
120 |
int tap_set_sndbuf(int fd, const NetdevTapOptions *tap) |
121 |
{ |
122 |
return 0; |
123 |
} |
124 |
|
125 |
int tap_probe_vnet_hdr(int fd) |
126 |
{ |
127 |
return 0; |
128 |
} |
129 |
|
130 |
int tap_probe_has_ufo(int fd) |
131 |
{ |
132 |
return 0; |
133 |
} |
134 |
|
135 |
int tap_probe_vnet_hdr_len(int fd, int len) |
136 |
{ |
137 |
return 0; |
138 |
} |
139 |
|
140 |
void tap_fd_set_vnet_hdr_len(int fd, int len) |
141 |
{ |
142 |
} |
143 |
|
144 |
void tap_fd_set_offload(int fd, int csum, int tso4, |
145 |
int tso6, int ecn, int ufo) |
146 |
{ |
147 |
} |