Merge tag 'pull-riscv-to-apply-20220703-1' of github.com:alistair23/qemu 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 "qapi/error.h"
27 #include "tap_int.h"
28 #include "qemu/cutils.h"
29 #include "qemu/error-report.h"
30
31 #if defined(__NetBSD__) || defined(__FreeBSD__)
32 #include <sys/ioctl.h>
33 #include <net/if.h>
34 #include <net/if_tap.h>
35 #endif
36
37 #ifndef __FreeBSD__
38 int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
39 int vnet_hdr_required, int mq_required, Error **errp)
40 {
41 int fd;
42 #ifdef TAPGIFNAME
43 struct ifreq ifr;
44 #else
45 char *dev;
46 struct stat s;
47 #endif
48
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 snprintf(dname, sizeof dname, "/dev/tap%d", i);
58 }
59 TFR(fd = open(dname, O_RDWR));
60 if (fd >= 0) {
61 break;
62 }
63 else if (errno == ENXIO || errno == ENOENT) {
64 break;
65 }
66 if (*ifname) {
67 break;
68 }
69 }
70 if (fd < 0) {
71 error_setg_errno(errp, errno, "could not open %s", dname);
72 return -1;
73 }
74
75 #ifdef TAPGIFNAME
76 if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) {
77 error_setg_errno(errp, errno, "could not get tap name");
78 return -1;
79 }
80 pstrcpy(ifname, ifname_size, ifr.ifr_name);
81 #else
82 if (fstat(fd, &s) < 0) {
83 error_setg_errno(errp, errno, "could not stat %s", dname);
84 return -1;
85 }
86 dev = devname(s.st_rdev, S_IFCHR);
87 pstrcpy(ifname, ifname_size, dev);
88 #endif
89
90 if (*vnet_hdr) {
91 /* BSD doesn't have IFF_VNET_HDR */
92 *vnet_hdr = 0;
93
94 if (vnet_hdr_required && !*vnet_hdr) {
95 error_setg(errp, "vnet_hdr=1 requested, but no kernel "
96 "support for IFF_VNET_HDR available");
97 close(fd);
98 return -1;
99 }
100 }
101 g_unix_set_fd_nonblocking(fd, true, NULL);
102 return fd;
103 }
104
105 #else /* __FreeBSD__ */
106
107 #define PATH_NET_TAP "/dev/tap"
108
109 static int tap_open_clone(char *ifname, int ifname_size, Error **errp)
110 {
111 int fd, s, ret;
112 struct ifreq ifr;
113
114 TFR(fd = open(PATH_NET_TAP, O_RDWR));
115 if (fd < 0) {
116 error_setg_errno(errp, errno, "could not open %s", PATH_NET_TAP);
117 return -1;
118 }
119
120 memset(&ifr, 0, sizeof(ifr));
121
122 ret = ioctl(fd, TAPGIFNAME, (void *)&ifr);
123 if (ret < 0) {
124 error_setg_errno(errp, errno, "could not get tap interface name");
125 close(fd);
126 return -1;
127 }
128
129 if (ifname[0] != '\0') {
130 /* User requested the interface to have a specific name */
131 s = socket(AF_LOCAL, SOCK_DGRAM, 0);
132 if (s < 0) {
133 error_setg_errno(errp, errno,
134 "could not open socket to set interface name");
135 close(fd);
136 return -1;
137 }
138 ifr.ifr_data = ifname;
139 ret = ioctl(s, SIOCSIFNAME, (void *)&ifr);
140 close(s);
141 if (ret < 0) {
142 error_setg(errp, "could not set tap interface name");
143 close(fd);
144 return -1;
145 }
146 } else {
147 pstrcpy(ifname, ifname_size, ifr.ifr_name);
148 }
149
150 return fd;
151 }
152
153 int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
154 int vnet_hdr_required, int mq_required, Error **errp)
155 {
156 int fd = -1;
157
158 /* If the specified tap device already exists just use it. */
159 if (ifname[0] != '\0') {
160 char dname[100];
161 snprintf(dname, sizeof dname, "/dev/%s", ifname);
162 TFR(fd = open(dname, O_RDWR));
163 if (fd < 0 && errno != ENOENT) {
164 error_setg_errno(errp, errno, "could not open %s", dname);
165 return -1;
166 }
167 }
168
169 if (fd < 0) {
170 /* Tap device not specified or does not exist. */
171 if ((fd = tap_open_clone(ifname, ifname_size, errp)) < 0) {
172 return -1;
173 }
174 }
175
176 if (*vnet_hdr) {
177 /* BSD doesn't have IFF_VNET_HDR */
178 *vnet_hdr = 0;
179
180 if (vnet_hdr_required && !*vnet_hdr) {
181 error_setg(errp, "vnet_hdr=1 requested, but no kernel "
182 "support for IFF_VNET_HDR available");
183 goto error;
184 }
185 }
186 if (mq_required) {
187 error_setg(errp, "mq_required requested, but no kernel support"
188 " for IFF_MULTI_QUEUE available");
189 goto error;
190 }
191
192 g_unix_set_fd_nonblocking(fd, true, NULL);
193 return fd;
194
195 error:
196 close(fd);
197 return -1;
198 }
199 #endif /* __FreeBSD__ */
200
201 void tap_set_sndbuf(int fd, const NetdevTapOptions *tap, Error **errp)
202 {
203 }
204
205 int tap_probe_vnet_hdr(int fd, Error **errp)
206 {
207 return 0;
208 }
209
210 int tap_probe_has_ufo(int fd)
211 {
212 return 0;
213 }
214
215 int tap_probe_vnet_hdr_len(int fd, int len)
216 {
217 return 0;
218 }
219
220 void tap_fd_set_vnet_hdr_len(int fd, int len)
221 {
222 }
223
224 int tap_fd_set_vnet_le(int fd, int is_le)
225 {
226 return -EINVAL;
227 }
228
229 int tap_fd_set_vnet_be(int fd, int is_be)
230 {
231 return -EINVAL;
232 }
233
234 void tap_fd_set_offload(int fd, int csum, int tso4,
235 int tso6, int ecn, int ufo)
236 {
237 }
238
239 int tap_fd_enable(int fd)
240 {
241 return -1;
242 }
243
244 int tap_fd_disable(int fd)
245 {
246 return -1;
247 }
248
249 int tap_fd_get_ifname(int fd, char *ifname)
250 {
251 return -1;
252 }
253
254 int tap_fd_set_steering_ebpf(int fd, int prog_fd)
255 {
256 return -1;
257 }