trap signals for "-serial mon:stdio"
[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 defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
48 defined(__OpenBSD__) || defined(__APPLE__)
49 /* if no ifname is given, always start the search from tap0/tun0. */
50 int i;
51 char dname[100];
52
53 for (i = 0; i < 10; i++) {
54 if (*ifname) {
55 snprintf(dname, sizeof dname, "/dev/%s", ifname);
56 } else {
57 #if defined(__OpenBSD__)
58 snprintf(dname, sizeof dname, "/dev/tun%d", i);
59 #else
60 snprintf(dname, sizeof dname, "/dev/tap%d", i);
61 #endif
62 }
63 TFR(fd = open(dname, O_RDWR));
64 if (fd >= 0) {
65 break;
66 }
67 else if (errno == ENXIO || errno == ENOENT) {
68 break;
69 }
70 if (*ifname) {
71 break;
72 }
73 }
74 if (fd < 0) {
75 error_report("warning: could not open %s (%s): no virtual network emulation",
76 dname, strerror(errno));
77 return -1;
78 }
79 #else
80 TFR(fd = open("/dev/tap", O_RDWR));
81 if (fd < 0) {
82 fprintf(stderr,
83 "warning: could not open /dev/tap: no virtual network emulation: %s\n",
84 strerror(errno));
85 return -1;
86 }
87 #endif
88
89 #ifdef TAPGIFNAME
90 if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) {
91 fprintf(stderr, "warning: could not get tap name: %s\n",
92 strerror(errno));
93 return -1;
94 }
95 pstrcpy(ifname, ifname_size, ifr.ifr_name);
96 #else
97 if (fstat(fd, &s) < 0) {
98 fprintf(stderr,
99 "warning: could not stat /dev/tap: no virtual network emulation: %s\n",
100 strerror(errno));
101 return -1;
102 }
103 dev = devname(s.st_rdev, S_IFCHR);
104 pstrcpy(ifname, ifname_size, dev);
105 #endif
106
107 if (*vnet_hdr) {
108 /* BSD doesn't have IFF_VNET_HDR */
109 *vnet_hdr = 0;
110
111 if (vnet_hdr_required && !*vnet_hdr) {
112 error_report("vnet_hdr=1 requested, but no kernel "
113 "support for IFF_VNET_HDR available");
114 close(fd);
115 return -1;
116 }
117 }
118 fcntl(fd, F_SETFL, O_NONBLOCK);
119 return fd;
120 }
121
122 int tap_set_sndbuf(int fd, const NetdevTapOptions *tap)
123 {
124 return 0;
125 }
126
127 int tap_probe_vnet_hdr(int fd)
128 {
129 return 0;
130 }
131
132 int tap_probe_has_ufo(int fd)
133 {
134 return 0;
135 }
136
137 int tap_probe_vnet_hdr_len(int fd, int len)
138 {
139 return 0;
140 }
141
142 void tap_fd_set_vnet_hdr_len(int fd, int len)
143 {
144 }
145
146 void tap_fd_set_offload(int fd, int csum, int tso4,
147 int tso6, int ecn, int ufo)
148 {
149 }
150
151 int tap_fd_enable(int fd)
152 {
153 return -1;
154 }
155
156 int tap_fd_disable(int fd)
157 {
158 return -1;
159 }
160
161 int tap_fd_get_ifname(int fd, char *ifname)
162 {
163 return -1;
164 }