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Commit | Line | Data |
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c28b1c10 MM |
1 | /* |
2 | * QEMU System Emulator | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * Copyright (c) 2009 Red Hat, Inc. | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
23 | * THE SOFTWARE. | |
24 | */ | |
25 | ||
2744d920 | 26 | #include "qemu/osdep.h" |
1422e32d PB |
27 | #include "tap_int.h" |
28 | #include "tap-linux.h" | |
c28b1c10 | 29 | #include "net/tap.h" |
c28b1c10 MM |
30 | |
31 | #include <net/if.h> | |
32 | #include <sys/ioctl.h> | |
33 | ||
da34e65c | 34 | #include "qapi/error.h" |
1de7afc9 | 35 | #include "qemu/error-report.h" |
f348b6d1 | 36 | #include "qemu/cutils.h" |
c28b1c10 | 37 | |
91ca60e0 MT |
38 | #define PATH_NET_TUN "/dev/net/tun" |
39 | ||
264986e2 | 40 | int tap_open(char *ifname, int ifname_size, int *vnet_hdr, |
468dd824 | 41 | int vnet_hdr_required, int mq_required, Error **errp) |
c28b1c10 MM |
42 | { |
43 | struct ifreq ifr; | |
44 | int fd, ret; | |
89e6d68e | 45 | int len = sizeof(struct virtio_net_hdr); |
d26e445c | 46 | unsigned int features; |
c28b1c10 | 47 | |
8b6aa693 | 48 | fd = RETRY_ON_EINTR(open(PATH_NET_TUN, O_RDWR)); |
c28b1c10 | 49 | if (fd < 0) { |
47896e2f | 50 | error_setg_errno(errp, errno, "could not open %s", PATH_NET_TUN); |
c28b1c10 MM |
51 | return -1; |
52 | } | |
53 | memset(&ifr, 0, sizeof(ifr)); | |
54 | ifr.ifr_flags = IFF_TAP | IFF_NO_PI; | |
55 | ||
1f149e72 | 56 | if (ioctl(fd, TUNGETFEATURES, &features) == -1) { |
3dc6f869 | 57 | warn_report("TUNGETFEATURES failed: %s", strerror(errno)); |
1f149e72 KK |
58 | features = 0; |
59 | } | |
60 | ||
61 | if (features & IFF_ONE_QUEUE) { | |
d26e445c PL |
62 | ifr.ifr_flags |= IFF_ONE_QUEUE; |
63 | } | |
c28b1c10 | 64 | |
d26e445c | 65 | if (*vnet_hdr) { |
1f149e72 | 66 | if (features & IFF_VNET_HDR) { |
c28b1c10 MM |
67 | *vnet_hdr = 1; |
68 | ifr.ifr_flags |= IFF_VNET_HDR; | |
6720b35b PR |
69 | } else { |
70 | *vnet_hdr = 0; | |
c28b1c10 MM |
71 | } |
72 | ||
73 | if (vnet_hdr_required && !*vnet_hdr) { | |
47896e2f MA |
74 | error_setg(errp, "vnet_hdr=1 requested, but no kernel " |
75 | "support for IFF_VNET_HDR available"); | |
c28b1c10 MM |
76 | close(fd); |
77 | return -1; | |
78 | } | |
89e6d68e MT |
79 | /* |
80 | * Make sure vnet header size has the default value: for a persistent | |
81 | * tap it might have been modified e.g. by another instance of qemu. | |
82 | * Ignore errors since old kernels do not support this ioctl: in this | |
83 | * case the header size implicitly has the correct value. | |
84 | */ | |
85 | ioctl(fd, TUNSETVNETHDRSZ, &len); | |
c28b1c10 MM |
86 | } |
87 | ||
94fdc6d0 | 88 | if (mq_required) { |
1f149e72 | 89 | if (!(features & IFF_MULTI_QUEUE)) { |
47896e2f MA |
90 | error_setg(errp, "multiqueue required, but no kernel " |
91 | "support for IFF_MULTI_QUEUE available"); | |
94fdc6d0 JW |
92 | close(fd); |
93 | return -1; | |
94 | } else { | |
95 | ifr.ifr_flags |= IFF_MULTI_QUEUE; | |
96 | } | |
97 | } | |
98 | ||
c28b1c10 MM |
99 | if (ifname[0] != '\0') |
100 | pstrcpy(ifr.ifr_name, IFNAMSIZ, ifname); | |
101 | else | |
102 | pstrcpy(ifr.ifr_name, IFNAMSIZ, "tap%d"); | |
103 | ret = ioctl(fd, TUNSETIFF, (void *) &ifr); | |
104 | if (ret != 0) { | |
93a7320e | 105 | if (ifname[0] != '\0') { |
47896e2f MA |
106 | error_setg_errno(errp, errno, "could not configure %s (%s)", |
107 | PATH_NET_TUN, ifr.ifr_name); | |
93a7320e | 108 | } else { |
47896e2f MA |
109 | error_setg_errno(errp, errno, "could not configure %s", |
110 | PATH_NET_TUN); | |
93a7320e | 111 | } |
c28b1c10 MM |
112 | close(fd); |
113 | return -1; | |
114 | } | |
115 | pstrcpy(ifname, ifname_size, ifr.ifr_name); | |
22e135fc | 116 | g_unix_set_fd_nonblocking(fd, true, NULL); |
c28b1c10 MM |
117 | return fd; |
118 | } | |
15ac913b | 119 | |
f157ed20 MT |
120 | /* sndbuf implements a kind of flow control for tap. |
121 | * Unfortunately when it's enabled, and packets are sent | |
122 | * to other guests on the same host, the receiver | |
123 | * can lock up the transmitter indefinitely. | |
124 | * | |
125 | * To avoid packet loss, sndbuf should be set to a value lower than the tx | |
126 | * queue capacity of any destination network interface. | |
15ac913b | 127 | * Ethernet NICs generally have txqueuelen=1000, so 1Mb is |
f157ed20 | 128 | * a good value, given a 1500 byte MTU. |
15ac913b | 129 | */ |
f157ed20 | 130 | #define TAP_DEFAULT_SNDBUF 0 |
15ac913b | 131 | |
80b832c3 | 132 | void tap_set_sndbuf(int fd, const NetdevTapOptions *tap, Error **errp) |
15ac913b MM |
133 | { |
134 | int sndbuf; | |
135 | ||
08c573a8 LE |
136 | sndbuf = !tap->has_sndbuf ? TAP_DEFAULT_SNDBUF : |
137 | tap->sndbuf > INT_MAX ? INT_MAX : | |
138 | tap->sndbuf; | |
139 | ||
15ac913b MM |
140 | if (!sndbuf) { |
141 | sndbuf = INT_MAX; | |
142 | } | |
143 | ||
08c573a8 | 144 | if (ioctl(fd, TUNSETSNDBUF, &sndbuf) == -1 && tap->has_sndbuf) { |
80b832c3 | 145 | error_setg_errno(errp, errno, "TUNSETSNDBUF ioctl failed"); |
15ac913b | 146 | } |
15ac913b | 147 | } |
dc69004c | 148 | |
e7b347d0 | 149 | int tap_probe_vnet_hdr(int fd, Error **errp) |
dc69004c MM |
150 | { |
151 | struct ifreq ifr; | |
e29919c9 | 152 | memset(&ifr, 0, sizeof(ifr)); |
dc69004c MM |
153 | |
154 | if (ioctl(fd, TUNGETIFF, &ifr) != 0) { | |
e7b347d0 DB |
155 | /* TUNGETIFF is available since kernel v2.6.27 */ |
156 | error_setg_errno(errp, errno, | |
157 | "Unable to query TUNGETIFF on FD %d", fd); | |
158 | return -1; | |
dc69004c MM |
159 | } |
160 | ||
161 | return ifr.ifr_flags & IFF_VNET_HDR; | |
162 | } | |
1faac1f7 | 163 | |
9c282718 MM |
164 | int tap_probe_has_ufo(int fd) |
165 | { | |
166 | unsigned offload; | |
167 | ||
168 | offload = TUN_F_CSUM | TUN_F_UFO; | |
169 | ||
170 | if (ioctl(fd, TUNSETOFFLOAD, offload) < 0) | |
171 | return 0; | |
172 | ||
173 | return 1; | |
174 | } | |
175 | ||
f03e0cf6 YB |
176 | int tap_probe_has_uso(int fd) |
177 | { | |
178 | unsigned offload; | |
179 | ||
180 | offload = TUN_F_CSUM | TUN_F_USO4 | TUN_F_USO6; | |
181 | ||
182 | if (ioctl(fd, TUNSETOFFLOAD, offload) < 0) { | |
183 | return 0; | |
184 | } | |
185 | return 1; | |
186 | } | |
187 | ||
445d892f MT |
188 | /* Verify that we can assign given length */ |
189 | int tap_probe_vnet_hdr_len(int fd, int len) | |
190 | { | |
191 | int orig; | |
192 | if (ioctl(fd, TUNGETVNETHDRSZ, &orig) == -1) { | |
193 | return 0; | |
194 | } | |
195 | if (ioctl(fd, TUNSETVNETHDRSZ, &len) == -1) { | |
196 | return 0; | |
197 | } | |
198 | /* Restore original length: we can't handle failure. */ | |
199 | if (ioctl(fd, TUNSETVNETHDRSZ, &orig) == -1) { | |
200 | fprintf(stderr, "TUNGETVNETHDRSZ ioctl() failed: %s. Exiting.\n", | |
201 | strerror(errno)); | |
28a65891 | 202 | abort(); |
445d892f MT |
203 | return -errno; |
204 | } | |
205 | return 1; | |
206 | } | |
207 | ||
208 | void tap_fd_set_vnet_hdr_len(int fd, int len) | |
209 | { | |
210 | if (ioctl(fd, TUNSETVNETHDRSZ, &len) == -1) { | |
211 | fprintf(stderr, "TUNSETVNETHDRSZ ioctl() failed: %s. Exiting.\n", | |
212 | strerror(errno)); | |
28a65891 | 213 | abort(); |
445d892f MT |
214 | } |
215 | } | |
216 | ||
c80cd6bb GK |
217 | int tap_fd_set_vnet_le(int fd, int is_le) |
218 | { | |
219 | int arg = is_le ? 1 : 0; | |
220 | ||
221 | if (!ioctl(fd, TUNSETVNETLE, &arg)) { | |
222 | return 0; | |
223 | } | |
224 | ||
225 | /* Check if our kernel supports TUNSETVNETLE */ | |
226 | if (errno == EINVAL) { | |
227 | return -errno; | |
228 | } | |
229 | ||
594fd211 | 230 | error_report("TUNSETVNETLE ioctl() failed: %s.", strerror(errno)); |
c80cd6bb GK |
231 | abort(); |
232 | } | |
233 | ||
234 | int tap_fd_set_vnet_be(int fd, int is_be) | |
235 | { | |
236 | int arg = is_be ? 1 : 0; | |
237 | ||
238 | if (!ioctl(fd, TUNSETVNETBE, &arg)) { | |
239 | return 0; | |
240 | } | |
241 | ||
242 | /* Check if our kernel supports TUNSETVNETBE */ | |
243 | if (errno == EINVAL) { | |
244 | return -errno; | |
245 | } | |
246 | ||
594fd211 | 247 | error_report("TUNSETVNETBE ioctl() failed: %s.", strerror(errno)); |
c80cd6bb GK |
248 | abort(); |
249 | } | |
250 | ||
1faac1f7 | 251 | void tap_fd_set_offload(int fd, int csum, int tso4, |
2ab0ec31 | 252 | int tso6, int ecn, int ufo, int uso4, int uso6) |
1faac1f7 MM |
253 | { |
254 | unsigned int offload = 0; | |
255 | ||
2e50326c PR |
256 | /* Check if our kernel supports TUNSETOFFLOAD */ |
257 | if (ioctl(fd, TUNSETOFFLOAD, 0) != 0 && errno == EINVAL) { | |
258 | return; | |
259 | } | |
260 | ||
1faac1f7 MM |
261 | if (csum) { |
262 | offload |= TUN_F_CSUM; | |
263 | if (tso4) | |
264 | offload |= TUN_F_TSO4; | |
265 | if (tso6) | |
266 | offload |= TUN_F_TSO6; | |
267 | if ((tso4 || tso6) && ecn) | |
268 | offload |= TUN_F_TSO_ECN; | |
269 | if (ufo) | |
270 | offload |= TUN_F_UFO; | |
2ab0ec31 AM |
271 | if (uso4) { |
272 | offload |= TUN_F_USO4; | |
273 | } | |
274 | if (uso6) { | |
275 | offload |= TUN_F_USO6; | |
276 | } | |
1faac1f7 MM |
277 | } |
278 | ||
279 | if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) { | |
2ab0ec31 | 280 | offload &= ~(TUN_F_USO4 | TUN_F_USO6); |
1faac1f7 | 281 | if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) { |
2ab0ec31 AM |
282 | offload &= ~TUN_F_UFO; |
283 | if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) { | |
284 | fprintf(stderr, "TUNSETOFFLOAD ioctl() failed: %s\n", | |
1faac1f7 | 285 | strerror(errno)); |
2ab0ec31 | 286 | } |
1faac1f7 MM |
287 | } |
288 | } | |
289 | } | |
94fdc6d0 JW |
290 | |
291 | /* Enable a specific queue of tap. */ | |
292 | int tap_fd_enable(int fd) | |
293 | { | |
294 | struct ifreq ifr; | |
295 | int ret; | |
296 | ||
297 | memset(&ifr, 0, sizeof(ifr)); | |
298 | ||
299 | ifr.ifr_flags = IFF_ATTACH_QUEUE; | |
300 | ret = ioctl(fd, TUNSETQUEUE, (void *) &ifr); | |
301 | ||
302 | if (ret != 0) { | |
303 | error_report("could not enable queue"); | |
304 | } | |
305 | ||
306 | return ret; | |
307 | } | |
308 | ||
309 | /* Disable a specific queue of tap/ */ | |
310 | int tap_fd_disable(int fd) | |
311 | { | |
312 | struct ifreq ifr; | |
313 | int ret; | |
314 | ||
315 | memset(&ifr, 0, sizeof(ifr)); | |
316 | ||
317 | ifr.ifr_flags = IFF_DETACH_QUEUE; | |
318 | ret = ioctl(fd, TUNSETQUEUE, (void *) &ifr); | |
319 | ||
320 | if (ret != 0) { | |
321 | error_report("could not disable queue"); | |
322 | } | |
323 | ||
324 | return ret; | |
325 | } | |
326 | ||
e5dc0b40 JW |
327 | int tap_fd_get_ifname(int fd, char *ifname) |
328 | { | |
329 | struct ifreq ifr; | |
330 | ||
331 | if (ioctl(fd, TUNGETIFF, &ifr) != 0) { | |
332 | error_report("TUNGETIFF ioctl() failed: %s", | |
333 | strerror(errno)); | |
334 | return -1; | |
335 | } | |
336 | ||
337 | pstrcpy(ifname, sizeof(ifr.ifr_name), ifr.ifr_name); | |
338 | return 0; | |
339 | } | |
8f364e34 AM |
340 | |
341 | int tap_fd_set_steering_ebpf(int fd, int prog_fd) | |
342 | { | |
343 | if (ioctl(fd, TUNSETSTEERINGEBPF, (void *) &prog_fd) != 0) { | |
344 | error_report("Issue while setting TUNSETSTEERINGEBPF:" | |
345 | " %s with fd: %d, prog_fd: %d", | |
346 | strerror(errno), fd, prog_fd); | |
347 | ||
348 | return -1; | |
349 | } | |
350 | ||
351 | return 0; | |
352 | } |