Annotation of qemu/net/tap-bsd.c, revision 1.1.1.3
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"
1.1.1.2 root 28: #include "qemu-error.h"
1.1 root 29:
30: #ifdef __NetBSD__
31: #include <net/if_tap.h>
32: #endif
33:
34: #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
35: #include <libutil.h>
36: #else
37: #include <util.h>
38: #endif
39:
40: int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required)
41: {
42: int fd;
43: char *dev;
44: struct stat s;
45:
1.1.1.3 ! root 46: #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
! 47: /* if no ifname is given, always start the search from tap0/tun0. */
1.1 root 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 {
1.1.1.3 ! root 55: #if defined(__OpenBSD__)
! 56: snprintf(dname, sizeof dname, "/dev/tun%d", i);
! 57: #else
1.1 root 58: snprintf(dname, sizeof dname, "/dev/tap%d", i);
1.1.1.3 ! root 59: #endif
1.1 root 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) {
1.1.1.2 root 73: error_report("warning: could not open %s (%s): no virtual network emulation",
74: dname, strerror(errno));
1.1 root 75: return -1;
76: }
77: #else
78: TFR(fd = open("/dev/tap", O_RDWR));
79: if (fd < 0) {
80: fprintf(stderr, "warning: could not open /dev/tap: no virtual network emulation\n");
81: return -1;
82: }
83: #endif
84:
85: fstat(fd, &s);
86: dev = devname(s.st_rdev, S_IFCHR);
87: pstrcpy(ifname, ifname_size, dev);
88:
89: if (*vnet_hdr) {
90: /* BSD doesn't have IFF_VNET_HDR */
91: *vnet_hdr = 0;
92:
93: if (vnet_hdr_required && !*vnet_hdr) {
1.1.1.2 root 94: error_report("vnet_hdr=1 requested, but no kernel "
95: "support for IFF_VNET_HDR available");
1.1 root 96: close(fd);
97: return -1;
98: }
99: }
100: fcntl(fd, F_SETFL, O_NONBLOCK);
101: return fd;
102: }
103:
104: int tap_set_sndbuf(int fd, QemuOpts *opts)
105: {
106: return 0;
107: }
108:
109: int tap_probe_vnet_hdr(int fd)
110: {
111: return 0;
112: }
113:
114: int tap_probe_has_ufo(int fd)
115: {
116: return 0;
117: }
118:
1.1.1.3 ! root 119: int tap_probe_vnet_hdr_len(int fd, int len)
! 120: {
! 121: return 0;
! 122: }
! 123:
! 124: void tap_fd_set_vnet_hdr_len(int fd, int len)
! 125: {
! 126: }
! 127:
1.1 root 128: void tap_fd_set_offload(int fd, int csum, int tso4,
129: int tso6, int ecn, int ufo)
130: {
131: }
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