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5281d757 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 | ||
a245fc18 | 26 | #include "tap.h" |
5281d757 MM |
27 | |
28 | #include "config-host.h" | |
29 | ||
5281d757 MM |
30 | #include <sys/ioctl.h> |
31 | #include <sys/stat.h> | |
32 | #include <sys/wait.h> | |
71f4effc | 33 | #include <sys/socket.h> |
5281d757 MM |
34 | #include <net/if.h> |
35 | ||
36 | #include "net.h" | |
a245fc18 | 37 | #include "clients.h" |
37003adf | 38 | #include "monitor.h" |
5281d757 MM |
39 | #include "sysemu.h" |
40 | #include "qemu-char.h" | |
41 | #include "qemu-common.h" | |
2f792016 | 42 | #include "qemu-error.h" |
5281d757 | 43 | |
5281d757 | 44 | #include "net/tap-linux.h" |
5281d757 | 45 | |
82b0d80e MT |
46 | #include "hw/vhost_net.h" |
47 | ||
5281d757 MM |
48 | /* Maximum GSO packet size (64k) plus plenty of room for |
49 | * the ethernet and virtio_net headers | |
50 | */ | |
51 | #define TAP_BUFSIZE (4096 + 65536) | |
52 | ||
53 | typedef struct TAPState { | |
4e68f7a0 | 54 | NetClientState nc; |
5281d757 MM |
55 | int fd; |
56 | char down_script[1024]; | |
57 | char down_script_arg[128]; | |
58 | uint8_t buf[TAP_BUFSIZE]; | |
59 | unsigned int read_poll : 1; | |
60 | unsigned int write_poll : 1; | |
5281d757 MM |
61 | unsigned int using_vnet_hdr : 1; |
62 | unsigned int has_ufo: 1; | |
82b0d80e | 63 | VHostNetState *vhost_net; |
ef4252b1 | 64 | unsigned host_vnet_hdr_len; |
5281d757 MM |
65 | } TAPState; |
66 | ||
67 | static int launch_script(const char *setup_script, const char *ifname, int fd); | |
68 | ||
69 | static int tap_can_send(void *opaque); | |
70 | static void tap_send(void *opaque); | |
71 | static void tap_writable(void *opaque); | |
72 | ||
73 | static void tap_update_fd_handler(TAPState *s) | |
74 | { | |
75 | qemu_set_fd_handler2(s->fd, | |
76 | s->read_poll ? tap_can_send : NULL, | |
77 | s->read_poll ? tap_send : NULL, | |
78 | s->write_poll ? tap_writable : NULL, | |
79 | s); | |
80 | } | |
81 | ||
82 | static void tap_read_poll(TAPState *s, int enable) | |
83 | { | |
84 | s->read_poll = !!enable; | |
85 | tap_update_fd_handler(s); | |
86 | } | |
87 | ||
88 | static void tap_write_poll(TAPState *s, int enable) | |
89 | { | |
90 | s->write_poll = !!enable; | |
91 | tap_update_fd_handler(s); | |
92 | } | |
93 | ||
94 | static void tap_writable(void *opaque) | |
95 | { | |
96 | TAPState *s = opaque; | |
97 | ||
98 | tap_write_poll(s, 0); | |
99 | ||
3e35ba93 | 100 | qemu_flush_queued_packets(&s->nc); |
5281d757 MM |
101 | } |
102 | ||
103 | static ssize_t tap_write_packet(TAPState *s, const struct iovec *iov, int iovcnt) | |
104 | { | |
105 | ssize_t len; | |
106 | ||
107 | do { | |
108 | len = writev(s->fd, iov, iovcnt); | |
109 | } while (len == -1 && errno == EINTR); | |
110 | ||
111 | if (len == -1 && errno == EAGAIN) { | |
112 | tap_write_poll(s, 1); | |
113 | return 0; | |
114 | } | |
115 | ||
116 | return len; | |
117 | } | |
118 | ||
4e68f7a0 | 119 | static ssize_t tap_receive_iov(NetClientState *nc, const struct iovec *iov, |
5281d757 MM |
120 | int iovcnt) |
121 | { | |
3e35ba93 | 122 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
5281d757 MM |
123 | const struct iovec *iovp = iov; |
124 | struct iovec iov_copy[iovcnt + 1]; | |
ef4252b1 | 125 | struct virtio_net_hdr_mrg_rxbuf hdr = { }; |
5281d757 | 126 | |
ef4252b1 | 127 | if (s->host_vnet_hdr_len && !s->using_vnet_hdr) { |
5281d757 | 128 | iov_copy[0].iov_base = &hdr; |
ef4252b1 | 129 | iov_copy[0].iov_len = s->host_vnet_hdr_len; |
5281d757 MM |
130 | memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov)); |
131 | iovp = iov_copy; | |
132 | iovcnt++; | |
133 | } | |
134 | ||
135 | return tap_write_packet(s, iovp, iovcnt); | |
136 | } | |
137 | ||
4e68f7a0 | 138 | static ssize_t tap_receive_raw(NetClientState *nc, const uint8_t *buf, size_t size) |
5281d757 | 139 | { |
3e35ba93 | 140 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
5281d757 MM |
141 | struct iovec iov[2]; |
142 | int iovcnt = 0; | |
ef4252b1 | 143 | struct virtio_net_hdr_mrg_rxbuf hdr = { }; |
5281d757 | 144 | |
ef4252b1 | 145 | if (s->host_vnet_hdr_len) { |
5281d757 | 146 | iov[iovcnt].iov_base = &hdr; |
ef4252b1 | 147 | iov[iovcnt].iov_len = s->host_vnet_hdr_len; |
5281d757 MM |
148 | iovcnt++; |
149 | } | |
150 | ||
151 | iov[iovcnt].iov_base = (char *)buf; | |
152 | iov[iovcnt].iov_len = size; | |
153 | iovcnt++; | |
154 | ||
155 | return tap_write_packet(s, iov, iovcnt); | |
156 | } | |
157 | ||
4e68f7a0 | 158 | static ssize_t tap_receive(NetClientState *nc, const uint8_t *buf, size_t size) |
5281d757 | 159 | { |
3e35ba93 | 160 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
5281d757 MM |
161 | struct iovec iov[1]; |
162 | ||
ef4252b1 | 163 | if (s->host_vnet_hdr_len && !s->using_vnet_hdr) { |
3e35ba93 | 164 | return tap_receive_raw(nc, buf, size); |
5281d757 MM |
165 | } |
166 | ||
167 | iov[0].iov_base = (char *)buf; | |
168 | iov[0].iov_len = size; | |
169 | ||
170 | return tap_write_packet(s, iov, 1); | |
171 | } | |
172 | ||
173 | static int tap_can_send(void *opaque) | |
174 | { | |
175 | TAPState *s = opaque; | |
176 | ||
3e35ba93 | 177 | return qemu_can_send_packet(&s->nc); |
5281d757 MM |
178 | } |
179 | ||
966ea5ec MM |
180 | #ifndef __sun__ |
181 | ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen) | |
5281d757 MM |
182 | { |
183 | return read(tapfd, buf, maxlen); | |
184 | } | |
185 | #endif | |
186 | ||
4e68f7a0 | 187 | static void tap_send_completed(NetClientState *nc, ssize_t len) |
5281d757 | 188 | { |
3e35ba93 | 189 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
5281d757 MM |
190 | tap_read_poll(s, 1); |
191 | } | |
192 | ||
193 | static void tap_send(void *opaque) | |
194 | { | |
195 | TAPState *s = opaque; | |
196 | int size; | |
197 | ||
5819c918 MM |
198 | do { |
199 | uint8_t *buf = s->buf; | |
200 | ||
201 | size = tap_read_packet(s->fd, s->buf, sizeof(s->buf)); | |
202 | if (size <= 0) { | |
203 | break; | |
204 | } | |
205 | ||
ef4252b1 MT |
206 | if (s->host_vnet_hdr_len && !s->using_vnet_hdr) { |
207 | buf += s->host_vnet_hdr_len; | |
208 | size -= s->host_vnet_hdr_len; | |
5819c918 MM |
209 | } |
210 | ||
3e35ba93 | 211 | size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed); |
5819c918 MM |
212 | if (size == 0) { |
213 | tap_read_poll(s, 0); | |
214 | } | |
3e35ba93 | 215 | } while (size > 0 && qemu_can_send_packet(&s->nc)); |
5281d757 MM |
216 | } |
217 | ||
4e68f7a0 | 218 | int tap_has_ufo(NetClientState *nc) |
5281d757 | 219 | { |
3e35ba93 | 220 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
5281d757 | 221 | |
2be64a68 | 222 | assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP); |
5281d757 MM |
223 | |
224 | return s->has_ufo; | |
225 | } | |
226 | ||
4e68f7a0 | 227 | int tap_has_vnet_hdr(NetClientState *nc) |
5281d757 | 228 | { |
3e35ba93 | 229 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
5281d757 | 230 | |
2be64a68 | 231 | assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP); |
5281d757 | 232 | |
ef4252b1 | 233 | return !!s->host_vnet_hdr_len; |
5281d757 MM |
234 | } |
235 | ||
4e68f7a0 | 236 | int tap_has_vnet_hdr_len(NetClientState *nc, int len) |
445d892f MT |
237 | { |
238 | TAPState *s = DO_UPCAST(TAPState, nc, nc); | |
239 | ||
2be64a68 | 240 | assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP); |
445d892f MT |
241 | |
242 | return tap_probe_vnet_hdr_len(s->fd, len); | |
243 | } | |
244 | ||
4e68f7a0 | 245 | void tap_set_vnet_hdr_len(NetClientState *nc, int len) |
445d892f MT |
246 | { |
247 | TAPState *s = DO_UPCAST(TAPState, nc, nc); | |
248 | ||
2be64a68 | 249 | assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP); |
445d892f MT |
250 | assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) || |
251 | len == sizeof(struct virtio_net_hdr)); | |
252 | ||
253 | tap_fd_set_vnet_hdr_len(s->fd, len); | |
254 | s->host_vnet_hdr_len = len; | |
255 | } | |
256 | ||
4e68f7a0 | 257 | void tap_using_vnet_hdr(NetClientState *nc, int using_vnet_hdr) |
5281d757 | 258 | { |
3e35ba93 | 259 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
5281d757 MM |
260 | |
261 | using_vnet_hdr = using_vnet_hdr != 0; | |
262 | ||
2be64a68 | 263 | assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP); |
ef4252b1 | 264 | assert(!!s->host_vnet_hdr_len == using_vnet_hdr); |
5281d757 MM |
265 | |
266 | s->using_vnet_hdr = using_vnet_hdr; | |
267 | } | |
268 | ||
4e68f7a0 | 269 | void tap_set_offload(NetClientState *nc, int csum, int tso4, |
5281d757 MM |
270 | int tso6, int ecn, int ufo) |
271 | { | |
3e35ba93 | 272 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
27a6375d MT |
273 | if (s->fd < 0) { |
274 | return; | |
275 | } | |
5281d757 | 276 | |
27a6375d | 277 | tap_fd_set_offload(s->fd, csum, tso4, tso6, ecn, ufo); |
5281d757 MM |
278 | } |
279 | ||
4e68f7a0 | 280 | static void tap_cleanup(NetClientState *nc) |
5281d757 | 281 | { |
3e35ba93 | 282 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
5281d757 | 283 | |
82b0d80e MT |
284 | if (s->vhost_net) { |
285 | vhost_net_cleanup(s->vhost_net); | |
43849424 | 286 | s->vhost_net = NULL; |
82b0d80e MT |
287 | } |
288 | ||
3e35ba93 | 289 | qemu_purge_queued_packets(nc); |
5281d757 MM |
290 | |
291 | if (s->down_script[0]) | |
292 | launch_script(s->down_script, s->down_script_arg, s->fd); | |
293 | ||
294 | tap_read_poll(s, 0); | |
295 | tap_write_poll(s, 0); | |
296 | close(s->fd); | |
27a6375d | 297 | s->fd = -1; |
5281d757 MM |
298 | } |
299 | ||
4e68f7a0 | 300 | static void tap_poll(NetClientState *nc, bool enable) |
ceb69615 MT |
301 | { |
302 | TAPState *s = DO_UPCAST(TAPState, nc, nc); | |
303 | tap_read_poll(s, enable); | |
304 | tap_write_poll(s, enable); | |
305 | } | |
306 | ||
4e68f7a0 | 307 | int tap_get_fd(NetClientState *nc) |
95d528a2 MT |
308 | { |
309 | TAPState *s = DO_UPCAST(TAPState, nc, nc); | |
2be64a68 | 310 | assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP); |
95d528a2 MT |
311 | return s->fd; |
312 | } | |
313 | ||
5281d757 MM |
314 | /* fd support */ |
315 | ||
3e35ba93 | 316 | static NetClientInfo net_tap_info = { |
2be64a68 | 317 | .type = NET_CLIENT_OPTIONS_KIND_TAP, |
3e35ba93 MM |
318 | .size = sizeof(TAPState), |
319 | .receive = tap_receive, | |
320 | .receive_raw = tap_receive_raw, | |
321 | .receive_iov = tap_receive_iov, | |
ceb69615 | 322 | .poll = tap_poll, |
3e35ba93 MM |
323 | .cleanup = tap_cleanup, |
324 | }; | |
325 | ||
4e68f7a0 | 326 | static TAPState *net_tap_fd_init(NetClientState *peer, |
5281d757 MM |
327 | const char *model, |
328 | const char *name, | |
329 | int fd, | |
330 | int vnet_hdr) | |
331 | { | |
4e68f7a0 | 332 | NetClientState *nc; |
5281d757 | 333 | TAPState *s; |
5281d757 | 334 | |
ab5f3f84 | 335 | nc = qemu_new_net_client(&net_tap_info, peer, model, name); |
3e35ba93 MM |
336 | |
337 | s = DO_UPCAST(TAPState, nc, nc); | |
338 | ||
5281d757 | 339 | s->fd = fd; |
ef4252b1 | 340 | s->host_vnet_hdr_len = vnet_hdr ? sizeof(struct virtio_net_hdr) : 0; |
5281d757 | 341 | s->using_vnet_hdr = 0; |
9c282718 | 342 | s->has_ufo = tap_probe_has_ufo(s->fd); |
3e35ba93 | 343 | tap_set_offload(&s->nc, 0, 0, 0, 0, 0); |
5281d757 | 344 | tap_read_poll(s, 1); |
82b0d80e | 345 | s->vhost_net = NULL; |
5281d757 MM |
346 | return s; |
347 | } | |
348 | ||
5281d757 MM |
349 | static int launch_script(const char *setup_script, const char *ifname, int fd) |
350 | { | |
5281d757 MM |
351 | int pid, status; |
352 | char *args[3]; | |
353 | char **parg; | |
354 | ||
5281d757 MM |
355 | /* try to launch network script */ |
356 | pid = fork(); | |
357 | if (pid == 0) { | |
358 | int open_max = sysconf(_SC_OPEN_MAX), i; | |
359 | ||
360 | for (i = 0; i < open_max; i++) { | |
361 | if (i != STDIN_FILENO && | |
362 | i != STDOUT_FILENO && | |
363 | i != STDERR_FILENO && | |
364 | i != fd) { | |
365 | close(i); | |
366 | } | |
367 | } | |
368 | parg = args; | |
369 | *parg++ = (char *)setup_script; | |
370 | *parg++ = (char *)ifname; | |
9678d950 | 371 | *parg = NULL; |
5281d757 MM |
372 | execv(setup_script, args); |
373 | _exit(1); | |
374 | } else if (pid > 0) { | |
375 | while (waitpid(pid, &status, 0) != pid) { | |
376 | /* loop */ | |
377 | } | |
5281d757 MM |
378 | |
379 | if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { | |
380 | return 0; | |
381 | } | |
382 | } | |
383 | fprintf(stderr, "%s: could not launch network script\n", setup_script); | |
384 | return -1; | |
385 | } | |
386 | ||
a7c36ee4 CB |
387 | static int recv_fd(int c) |
388 | { | |
389 | int fd; | |
390 | uint8_t msgbuf[CMSG_SPACE(sizeof(fd))]; | |
391 | struct msghdr msg = { | |
392 | .msg_control = msgbuf, | |
393 | .msg_controllen = sizeof(msgbuf), | |
394 | }; | |
395 | struct cmsghdr *cmsg; | |
396 | struct iovec iov; | |
397 | uint8_t req[1]; | |
398 | ssize_t len; | |
399 | ||
400 | cmsg = CMSG_FIRSTHDR(&msg); | |
401 | cmsg->cmsg_level = SOL_SOCKET; | |
402 | cmsg->cmsg_type = SCM_RIGHTS; | |
403 | cmsg->cmsg_len = CMSG_LEN(sizeof(fd)); | |
404 | msg.msg_controllen = cmsg->cmsg_len; | |
405 | ||
406 | iov.iov_base = req; | |
407 | iov.iov_len = sizeof(req); | |
408 | ||
409 | msg.msg_iov = &iov; | |
410 | msg.msg_iovlen = 1; | |
411 | ||
412 | len = recvmsg(c, &msg, 0); | |
413 | if (len > 0) { | |
414 | memcpy(&fd, CMSG_DATA(cmsg), sizeof(fd)); | |
415 | return fd; | |
416 | } | |
417 | ||
418 | return len; | |
419 | } | |
420 | ||
421 | static int net_bridge_run_helper(const char *helper, const char *bridge) | |
422 | { | |
423 | sigset_t oldmask, mask; | |
424 | int pid, status; | |
425 | char *args[5]; | |
426 | char **parg; | |
427 | int sv[2]; | |
428 | ||
429 | sigemptyset(&mask); | |
430 | sigaddset(&mask, SIGCHLD); | |
431 | sigprocmask(SIG_BLOCK, &mask, &oldmask); | |
432 | ||
433 | if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) == -1) { | |
434 | return -1; | |
435 | } | |
436 | ||
437 | /* try to launch bridge helper */ | |
438 | pid = fork(); | |
439 | if (pid == 0) { | |
440 | int open_max = sysconf(_SC_OPEN_MAX), i; | |
441 | char fd_buf[6+10]; | |
442 | char br_buf[6+IFNAMSIZ] = {0}; | |
443 | char helper_cmd[PATH_MAX + sizeof(fd_buf) + sizeof(br_buf) + 15]; | |
444 | ||
445 | for (i = 0; i < open_max; i++) { | |
446 | if (i != STDIN_FILENO && | |
447 | i != STDOUT_FILENO && | |
448 | i != STDERR_FILENO && | |
449 | i != sv[1]) { | |
450 | close(i); | |
451 | } | |
452 | } | |
453 | ||
454 | snprintf(fd_buf, sizeof(fd_buf), "%s%d", "--fd=", sv[1]); | |
455 | ||
456 | if (strrchr(helper, ' ') || strrchr(helper, '\t')) { | |
457 | /* assume helper is a command */ | |
458 | ||
459 | if (strstr(helper, "--br=") == NULL) { | |
460 | snprintf(br_buf, sizeof(br_buf), "%s%s", "--br=", bridge); | |
461 | } | |
462 | ||
463 | snprintf(helper_cmd, sizeof(helper_cmd), "%s %s %s %s", | |
464 | helper, "--use-vnet", fd_buf, br_buf); | |
465 | ||
466 | parg = args; | |
467 | *parg++ = (char *)"sh"; | |
468 | *parg++ = (char *)"-c"; | |
469 | *parg++ = helper_cmd; | |
470 | *parg++ = NULL; | |
471 | ||
472 | execv("/bin/sh", args); | |
473 | } else { | |
474 | /* assume helper is just the executable path name */ | |
475 | ||
476 | snprintf(br_buf, sizeof(br_buf), "%s%s", "--br=", bridge); | |
477 | ||
478 | parg = args; | |
479 | *parg++ = (char *)helper; | |
480 | *parg++ = (char *)"--use-vnet"; | |
481 | *parg++ = fd_buf; | |
482 | *parg++ = br_buf; | |
483 | *parg++ = NULL; | |
484 | ||
485 | execv(helper, args); | |
486 | } | |
487 | _exit(1); | |
488 | ||
489 | } else if (pid > 0) { | |
490 | int fd; | |
491 | ||
492 | close(sv[1]); | |
493 | ||
494 | do { | |
495 | fd = recv_fd(sv[0]); | |
496 | } while (fd == -1 && errno == EINTR); | |
497 | ||
498 | close(sv[0]); | |
499 | ||
500 | while (waitpid(pid, &status, 0) != pid) { | |
501 | /* loop */ | |
502 | } | |
503 | sigprocmask(SIG_SETMASK, &oldmask, NULL); | |
504 | if (fd < 0) { | |
505 | fprintf(stderr, "failed to recv file descriptor\n"); | |
506 | return -1; | |
507 | } | |
508 | ||
509 | if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { | |
510 | return fd; | |
511 | } | |
512 | } | |
513 | fprintf(stderr, "failed to launch bridge helper\n"); | |
514 | return -1; | |
515 | } | |
516 | ||
1a0c0958 | 517 | int net_init_bridge(const NetClientOptions *opts, const char *name, |
4e68f7a0 | 518 | NetClientState *peer) |
a7c36ee4 | 519 | { |
f79b51b0 LE |
520 | const NetdevBridgeOptions *bridge; |
521 | const char *helper, *br; | |
522 | ||
a7c36ee4 CB |
523 | TAPState *s; |
524 | int fd, vnet_hdr; | |
525 | ||
f79b51b0 LE |
526 | assert(opts->kind == NET_CLIENT_OPTIONS_KIND_BRIDGE); |
527 | bridge = opts->bridge; | |
528 | ||
529 | helper = bridge->has_helper ? bridge->helper : DEFAULT_BRIDGE_HELPER; | |
530 | br = bridge->has_br ? bridge->br : DEFAULT_BRIDGE_INTERFACE; | |
a7c36ee4 | 531 | |
f79b51b0 | 532 | fd = net_bridge_run_helper(helper, br); |
a7c36ee4 CB |
533 | if (fd == -1) { |
534 | return -1; | |
535 | } | |
536 | ||
537 | fcntl(fd, F_SETFL, O_NONBLOCK); | |
538 | ||
539 | vnet_hdr = tap_probe_vnet_hdr(fd); | |
540 | ||
d33d93b2 | 541 | s = net_tap_fd_init(peer, "bridge", name, fd, vnet_hdr); |
a7c36ee4 CB |
542 | if (!s) { |
543 | close(fd); | |
544 | return -1; | |
545 | } | |
546 | ||
f79b51b0 LE |
547 | snprintf(s->nc.info_str, sizeof(s->nc.info_str), "helper=%s,br=%s", helper, |
548 | br); | |
a7c36ee4 CB |
549 | |
550 | return 0; | |
551 | } | |
552 | ||
08c573a8 LE |
553 | static int net_tap_init(const NetdevTapOptions *tap, int *vnet_hdr, |
554 | const char *setup_script, char *ifname, | |
555 | size_t ifname_sz) | |
5281d757 MM |
556 | { |
557 | int fd, vnet_hdr_required; | |
5281d757 | 558 | |
08c573a8 LE |
559 | if (tap->has_ifname) { |
560 | pstrcpy(ifname, ifname_sz, tap->ifname); | |
561 | } else { | |
562 | assert(ifname_sz > 0); | |
563 | ifname[0] = '\0'; | |
5281d757 MM |
564 | } |
565 | ||
08c573a8 LE |
566 | if (tap->has_vnet_hdr) { |
567 | *vnet_hdr = tap->vnet_hdr; | |
5281d757 MM |
568 | vnet_hdr_required = *vnet_hdr; |
569 | } else { | |
08c573a8 | 570 | *vnet_hdr = 1; |
5281d757 MM |
571 | vnet_hdr_required = 0; |
572 | } | |
573 | ||
08c573a8 | 574 | TFR(fd = tap_open(ifname, ifname_sz, vnet_hdr, vnet_hdr_required)); |
5281d757 MM |
575 | if (fd < 0) { |
576 | return -1; | |
577 | } | |
578 | ||
5281d757 MM |
579 | if (setup_script && |
580 | setup_script[0] != '\0' && | |
581 | strcmp(setup_script, "no") != 0 && | |
582 | launch_script(setup_script, ifname, fd)) { | |
583 | close(fd); | |
584 | return -1; | |
585 | } | |
586 | ||
5281d757 MM |
587 | return fd; |
588 | } | |
589 | ||
1a0c0958 | 590 | int net_init_tap(const NetClientOptions *opts, const char *name, |
4e68f7a0 | 591 | NetClientState *peer) |
5281d757 | 592 | { |
08c573a8 LE |
593 | const NetdevTapOptions *tap; |
594 | ||
df6c2a0f | 595 | int fd, vnet_hdr = 0; |
a7c36ee4 | 596 | const char *model; |
08c573a8 LE |
597 | TAPState *s; |
598 | ||
599 | /* for the no-fd, no-helper case */ | |
600 | const char *script = NULL; /* suppress wrong "uninit'd use" gcc warning */ | |
601 | char ifname[128]; | |
602 | ||
603 | assert(opts->kind == NET_CLIENT_OPTIONS_KIND_TAP); | |
604 | tap = opts->tap; | |
5281d757 | 605 | |
08c573a8 LE |
606 | if (tap->has_fd) { |
607 | if (tap->has_ifname || tap->has_script || tap->has_downscript || | |
608 | tap->has_vnet_hdr || tap->has_helper) { | |
a7c36ee4 CB |
609 | error_report("ifname=, script=, downscript=, vnet_hdr=, " |
610 | "and helper= are invalid with fd="); | |
5281d757 MM |
611 | return -1; |
612 | } | |
613 | ||
a96ed02f | 614 | fd = monitor_handle_fd_param(cur_mon, tap->fd); |
5281d757 MM |
615 | if (fd == -1) { |
616 | return -1; | |
617 | } | |
618 | ||
619 | fcntl(fd, F_SETFL, O_NONBLOCK); | |
620 | ||
621 | vnet_hdr = tap_probe_vnet_hdr(fd); | |
a7c36ee4 CB |
622 | |
623 | model = "tap"; | |
624 | ||
08c573a8 LE |
625 | } else if (tap->has_helper) { |
626 | if (tap->has_ifname || tap->has_script || tap->has_downscript || | |
627 | tap->has_vnet_hdr) { | |
a7c36ee4 CB |
628 | error_report("ifname=, script=, downscript=, and vnet_hdr= " |
629 | "are invalid with helper="); | |
630 | return -1; | |
631 | } | |
632 | ||
08c573a8 | 633 | fd = net_bridge_run_helper(tap->helper, DEFAULT_BRIDGE_INTERFACE); |
a7c36ee4 CB |
634 | if (fd == -1) { |
635 | return -1; | |
636 | } | |
637 | ||
638 | fcntl(fd, F_SETFL, O_NONBLOCK); | |
639 | ||
640 | vnet_hdr = tap_probe_vnet_hdr(fd); | |
641 | ||
642 | model = "bridge"; | |
643 | ||
5281d757 | 644 | } else { |
08c573a8 LE |
645 | script = tap->has_script ? tap->script : DEFAULT_NETWORK_SCRIPT; |
646 | fd = net_tap_init(tap, &vnet_hdr, script, ifname, sizeof ifname); | |
929fe497 JL |
647 | if (fd == -1) { |
648 | return -1; | |
649 | } | |
a7c36ee4 CB |
650 | |
651 | model = "tap"; | |
5281d757 MM |
652 | } |
653 | ||
d33d93b2 | 654 | s = net_tap_fd_init(peer, model, name, fd, vnet_hdr); |
5281d757 MM |
655 | if (!s) { |
656 | close(fd); | |
657 | return -1; | |
658 | } | |
659 | ||
08c573a8 | 660 | if (tap_set_sndbuf(s->fd, tap) < 0) { |
5281d757 MM |
661 | return -1; |
662 | } | |
663 | ||
08c573a8 | 664 | if (tap->has_fd) { |
3e35ba93 | 665 | snprintf(s->nc.info_str, sizeof(s->nc.info_str), "fd=%d", fd); |
08c573a8 LE |
666 | } else if (tap->has_helper) { |
667 | snprintf(s->nc.info_str, sizeof(s->nc.info_str), "helper=%s", | |
668 | tap->helper); | |
5281d757 | 669 | } else { |
08c573a8 | 670 | const char *downscript; |
5281d757 | 671 | |
08c573a8 LE |
672 | downscript = tap->has_downscript ? tap->downscript : |
673 | DEFAULT_NETWORK_DOWN_SCRIPT; | |
5281d757 | 674 | |
3e35ba93 | 675 | snprintf(s->nc.info_str, sizeof(s->nc.info_str), |
08c573a8 LE |
676 | "ifname=%s,script=%s,downscript=%s", ifname, script, |
677 | downscript); | |
5281d757 MM |
678 | |
679 | if (strcmp(downscript, "no") != 0) { | |
680 | snprintf(s->down_script, sizeof(s->down_script), "%s", downscript); | |
681 | snprintf(s->down_script_arg, sizeof(s->down_script_arg), "%s", ifname); | |
682 | } | |
683 | } | |
684 | ||
08c573a8 LE |
685 | if (tap->has_vhost ? tap->vhost : |
686 | tap->has_vhostfd || (tap->has_vhostforce && tap->vhostforce)) { | |
687 | int vhostfd; | |
688 | ||
689 | if (tap->has_vhostfd) { | |
a96ed02f | 690 | vhostfd = monitor_handle_fd_param(cur_mon, tap->vhostfd); |
08c573a8 | 691 | if (vhostfd == -1) { |
82b0d80e MT |
692 | return -1; |
693 | } | |
82b0d80e MT |
694 | } else { |
695 | vhostfd = -1; | |
696 | } | |
08c573a8 LE |
697 | |
698 | s->vhost_net = vhost_net_init(&s->nc, vhostfd, | |
699 | tap->has_vhostforce && tap->vhostforce); | |
82b0d80e MT |
700 | if (!s->vhost_net) { |
701 | error_report("vhost-net requested but could not be initialized"); | |
702 | return -1; | |
703 | } | |
08c573a8 | 704 | } else if (tap->has_vhostfd) { |
82b0d80e MT |
705 | error_report("vhostfd= is not valid without vhost"); |
706 | return -1; | |
707 | } | |
708 | ||
5281d757 MM |
709 | return 0; |
710 | } | |
b202554c | 711 | |
4e68f7a0 | 712 | VHostNetState *tap_get_vhost_net(NetClientState *nc) |
b202554c MT |
713 | { |
714 | TAPState *s = DO_UPCAST(TAPState, nc, nc); | |
2be64a68 | 715 | assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP); |
b202554c MT |
716 | return s->vhost_net; |
717 | } |