Merge remote-tracking branch 'remotes/jasowang/tags/net-pull-request' into staging
[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 "qemu/osdep.h"
26 #include "qemu-common.h"
27 #include "qapi/error.h"
28 #include "tap_int.h"
29 #include "qemu/cutils.h"
30 #include "qemu/error-report.h"
31
32 #if defined(__NetBSD__) || defined(__FreeBSD__)
33 #include <sys/ioctl.h>
34 #include <net/if.h>
35 #include <net/if_tap.h>
36 #endif
37
38 #ifndef __FreeBSD__
39 int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
40 int vnet_hdr_required, int mq_required, Error **errp)
41 {
42 int fd;
43 #ifdef TAPGIFNAME
44 struct ifreq ifr;
45 #else
46 char *dev;
47 struct stat s;
48 #endif
49
50 /* if no ifname is given, always start the search from tap0/tun0. */
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 error_setg_errno(errp, errno, "could not open %s", dname);
73 return -1;
74 }
75
76 #ifdef TAPGIFNAME
77 if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) {
78 error_setg_errno(errp, errno, "could not get tap name");
79 return -1;
80 }
81 pstrcpy(ifname, ifname_size, ifr.ifr_name);
82 #else
83 if (fstat(fd, &s) < 0) {
84 error_setg_errno(errp, errno, "could not stat %s", dname);
85 return -1;
86 }
87 dev = devname(s.st_rdev, S_IFCHR);
88 pstrcpy(ifname, ifname_size, dev);
89 #endif
90
91 if (*vnet_hdr) {
92 /* BSD doesn't have IFF_VNET_HDR */
93 *vnet_hdr = 0;
94
95 if (vnet_hdr_required && !*vnet_hdr) {
96 error_setg(errp, "vnet_hdr=1 requested, but no kernel "
97 "support for IFF_VNET_HDR available");
98 close(fd);
99 return -1;
100 }
101 }
102 fcntl(fd, F_SETFL, O_NONBLOCK);
103 return fd;
104 }
105
106 #else /* __FreeBSD__ */
107
108 #define PATH_NET_TAP "/dev/tap"
109
110 static int tap_open_clone(char *ifname, int ifname_size, Error **errp)
111 {
112 int fd, s, ret;
113 struct ifreq ifr;
114
115 TFR(fd = open(PATH_NET_TAP, O_RDWR));
116 if (fd < 0) {
117 error_setg_errno(errp, errno, "could not open %s", PATH_NET_TAP);
118 return -1;
119 }
120
121 memset(&ifr, 0, sizeof(ifr));
122
123 ret = ioctl(fd, TAPGIFNAME, (void *)&ifr);
124 if (ret < 0) {
125 error_setg_errno(errp, errno, "could not get tap interface name");
126 close(fd);
127 return -1;
128 }
129
130 if (ifname[0] != '\0') {
131 /* User requested the interface to have a specific name */
132 s = socket(AF_LOCAL, SOCK_DGRAM, 0);
133 if (s < 0) {
134 error_setg_errno(errp, errno,
135 "could not open socket to set interface name");
136 close(fd);
137 return -1;
138 }
139 ifr.ifr_data = ifname;
140 ret = ioctl(s, SIOCSIFNAME, (void *)&ifr);
141 close(s);
142 if (ret < 0) {
143 error_setg(errp, "could not set tap interface name");
144 close(fd);
145 return -1;
146 }
147 } else {
148 pstrcpy(ifname, ifname_size, ifr.ifr_name);
149 }
150
151 return fd;
152 }
153
154 int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
155 int vnet_hdr_required, int mq_required, Error **errp)
156 {
157 int fd = -1;
158
159 /* If the specified tap device already exists just use it. */
160 if (ifname[0] != '\0') {
161 char dname[100];
162 snprintf(dname, sizeof dname, "/dev/%s", ifname);
163 TFR(fd = open(dname, O_RDWR));
164 if (fd < 0 && errno != ENOENT) {
165 error_setg_errno(errp, errno, "could not open %s", dname);
166 return -1;
167 }
168 }
169
170 if (fd < 0) {
171 /* Tap device not specified or does not exist. */
172 if ((fd = tap_open_clone(ifname, ifname_size, errp)) < 0) {
173 return -1;
174 }
175 }
176
177 if (*vnet_hdr) {
178 /* BSD doesn't have IFF_VNET_HDR */
179 *vnet_hdr = 0;
180
181 if (vnet_hdr_required && !*vnet_hdr) {
182 error_setg(errp, "vnet_hdr=1 requested, but no kernel "
183 "support for IFF_VNET_HDR available");
184 goto error;
185 }
186 }
187 if (mq_required) {
188 error_setg(errp, "mq_required requested, but no kernel support"
189 " for IFF_MULTI_QUEUE available");
190 goto error;
191 }
192
193 fcntl(fd, F_SETFL, O_NONBLOCK);
194 return fd;
195
196 error:
197 close(fd);
198 return -1;
199 }
200 #endif /* __FreeBSD__ */
201
202 void tap_set_sndbuf(int fd, const NetdevTapOptions *tap, Error **errp)
203 {
204 }
205
206 int tap_probe_vnet_hdr(int fd, Error **errp)
207 {
208 return 0;
209 }
210
211 int tap_probe_has_ufo(int fd)
212 {
213 return 0;
214 }
215
216 int tap_probe_vnet_hdr_len(int fd, int len)
217 {
218 return 0;
219 }
220
221 void tap_fd_set_vnet_hdr_len(int fd, int len)
222 {
223 }
224
225 int tap_fd_set_vnet_le(int fd, int is_le)
226 {
227 return -EINVAL;
228 }
229
230 int tap_fd_set_vnet_be(int fd, int is_be)
231 {
232 return -EINVAL;
233 }
234
235 void tap_fd_set_offload(int fd, int csum, int tso4,
236 int tso6, int ecn, int ufo)
237 {
238 }
239
240 int tap_fd_enable(int fd)
241 {
242 return -1;
243 }
244
245 int tap_fd_disable(int fd)
246 {
247 return -1;
248 }
249
250 int tap_fd_get_ifname(int fd, char *ifname)
251 {
252 return -1;
253 }
254
255 int tap_fd_set_steering_ebpf(int fd, int prog_fd)
256 {
257 return -1;
258 }