Annotation of qemu/net/tap-bsd.c, revision 1.1.1.1
1.1 root 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:
29: #ifdef __NetBSD__
30: #include <net/if_tap.h>
31: #endif
32:
33: #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
34: #include <libutil.h>
35: #else
36: #include <util.h>
37: #endif
38:
39: #if defined(__OpenBSD__)
40: #include <util.h>
41: #endif
42:
43: int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required)
44: {
45: int fd;
46: char *dev;
47: struct stat s;
48:
49: #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
50: /* if no ifname is given, always start the search from tap0. */
51: int i;
52: char dname[100];
53:
54: for (i = 0; i < 10; i++) {
55: if (*ifname) {
56: snprintf(dname, sizeof dname, "/dev/%s", ifname);
57: } else {
58: snprintf(dname, sizeof dname, "/dev/tap%d", i);
59: }
60: TFR(fd = open(dname, O_RDWR));
61: if (fd >= 0) {
62: break;
63: }
64: else if (errno == ENXIO || errno == ENOENT) {
65: break;
66: }
67: if (*ifname) {
68: break;
69: }
70: }
71: if (fd < 0) {
72: qemu_error("warning: could not open %s (%s): no virtual network emulation\n", dname, strerror(errno));
73: return -1;
74: }
75: #else
76: TFR(fd = open("/dev/tap", O_RDWR));
77: if (fd < 0) {
78: fprintf(stderr, "warning: could not open /dev/tap: no virtual network emulation\n");
79: return -1;
80: }
81: #endif
82:
83: fstat(fd, &s);
84: dev = devname(s.st_rdev, S_IFCHR);
85: pstrcpy(ifname, ifname_size, dev);
86:
87: if (*vnet_hdr) {
88: /* BSD doesn't have IFF_VNET_HDR */
89: *vnet_hdr = 0;
90:
91: if (vnet_hdr_required && !*vnet_hdr) {
92: qemu_error("vnet_hdr=1 requested, but no kernel "
93: "support for IFF_VNET_HDR available");
94: close(fd);
95: return -1;
96: }
97: }
98: fcntl(fd, F_SETFL, O_NONBLOCK);
99: return fd;
100: }
101:
102: int tap_set_sndbuf(int fd, QemuOpts *opts)
103: {
104: return 0;
105: }
106:
107: int tap_probe_vnet_hdr(int fd)
108: {
109: return 0;
110: }
111:
112: int tap_probe_has_ufo(int fd)
113: {
114: return 0;
115: }
116:
117: void tap_fd_set_offload(int fd, int csum, int tso4,
118: int tso6, int ecn, int ufo)
119: {
120: }
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