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Commit | Line | Data |
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0ad19a3f | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
0ad19a3f | 8 | * |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
0ad19a3f | 22 | */ |
cb0dc11b | 23 | |
d38dd64a CB |
24 | #ifndef _GNU_SOURCE |
25 | #define _GNU_SOURCE 1 | |
26 | #endif | |
27 | #include <arpa/inet.h> | |
cb0dc11b CB |
28 | #include <ctype.h> |
29 | #include <errno.h> | |
30 | #include <fcntl.h> | |
0ad19a3f | 31 | #include <linux/netlink.h> |
32 | #include <linux/rtnetlink.h> | |
33 | #include <linux/sockios.h> | |
cb0dc11b CB |
34 | #include <net/ethernet.h> |
35 | #include <net/if.h> | |
36 | #include <net/if_arp.h> | |
37 | #include <netinet/in.h> | |
d38dd64a CB |
38 | #include <stdio.h> |
39 | #include <stdlib.h> | |
40 | #include <string.h> | |
cb0dc11b CB |
41 | #include <sys/inotify.h> |
42 | #include <sys/ioctl.h> | |
43 | #include <sys/param.h> | |
44 | #include <sys/socket.h> | |
45 | #include <sys/stat.h> | |
46 | #include <sys/types.h> | |
d38dd64a CB |
47 | #include <time.h> |
48 | #include <unistd.h> | |
f549edcc | 49 | |
d38dd64a | 50 | #include "../include/netns_ifaddrs.h" |
7ab1ba02 | 51 | #include "af_unix.h" |
72d0e1cb | 52 | #include "conf.h" |
811ef482 | 53 | #include "config.h" |
e3233f26 | 54 | #include "file_utils.h" |
cb0dc11b | 55 | #include "log.h" |
8335fd40 | 56 | #include "macro.h" |
95ea3d1f | 57 | #include "memory_utils.h" |
cb0dc11b CB |
58 | #include "network.h" |
59 | #include "nl.h" | |
d7b58715 | 60 | #include "raw_syscalls.h" |
59524108 | 61 | #include "syscall_wrappers.h" |
0d204771 | 62 | #include "utils.h" |
0ad19a3f | 63 | |
9de31d5a CB |
64 | #ifndef HAVE_STRLCPY |
65 | #include "include/strlcpy.h" | |
66 | #endif | |
67 | ||
ac2cecc4 | 68 | lxc_log_define(network, lxc); |
f8fee0e2 | 69 | |
811ef482 CB |
70 | typedef int (*instantiate_cb)(struct lxc_handler *, struct lxc_netdev *); |
71 | ||
72 | static int instantiate_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
73 | { | |
74 | int bridge_index, err; | |
75 | char *veth1, *veth2; | |
76 | char veth1buf[IFNAMSIZ], veth2buf[IFNAMSIZ]; | |
77 | unsigned int mtu = 0; | |
78 | ||
de4855a8 | 79 | if (netdev->priv.veth_attr.pair[0] != '\0') { |
811ef482 CB |
80 | veth1 = netdev->priv.veth_attr.pair; |
81 | if (handler->conf->reboot) | |
82 | lxc_netdev_delete_by_name(veth1); | |
83 | } else { | |
84 | err = snprintf(veth1buf, sizeof(veth1buf), "vethXXXXXX"); | |
85 | if (err < 0 || (size_t)err >= sizeof(veth1buf)) | |
86 | return -1; | |
87 | ||
88 | veth1 = lxc_mkifname(veth1buf); | |
89 | if (!veth1) | |
90 | return -1; | |
91 | ||
92 | /* store away for deconf */ | |
93 | memcpy(netdev->priv.veth_attr.veth1, veth1, IFNAMSIZ); | |
94 | } | |
95 | ||
d34212ad CB |
96 | err = snprintf(veth2buf, sizeof(veth2buf), "vethXXXXXX"); |
97 | if (err < 0 || (size_t)err >= sizeof(veth2buf)) | |
98 | return -1; | |
99 | ||
811ef482 CB |
100 | veth2 = lxc_mkifname(veth2buf); |
101 | if (!veth2) | |
102 | goto out_delete; | |
103 | ||
104 | err = lxc_veth_create(veth1, veth2); | |
105 | if (err) { | |
6d1400b5 | 106 | errno = -err; |
107 | SYSERROR("Failed to create veth pair \"%s\" and \"%s\"", veth1, veth2); | |
811ef482 CB |
108 | goto out_delete; |
109 | } | |
110 | ||
111 | /* changing the high byte of the mac address to 0xfe, the bridge interface | |
112 | * will always keep the host's mac address and not take the mac address | |
113 | * of a container */ | |
114 | err = setup_private_host_hw_addr(veth1); | |
115 | if (err) { | |
6d1400b5 | 116 | errno = -err; |
117 | SYSERROR("Failed to change mac address of host interface \"%s\"", veth1); | |
811ef482 CB |
118 | goto out_delete; |
119 | } | |
120 | ||
8da62485 CB |
121 | /* Retrieve ifindex of the host's veth device. */ |
122 | netdev->priv.veth_attr.ifindex = if_nametoindex(veth1); | |
123 | if (!netdev->priv.veth_attr.ifindex) { | |
124 | ERROR("Failed to retrieve ifindex for \"%s\"", veth1); | |
125 | goto out_delete; | |
126 | } | |
127 | ||
128 | /* Note that we're retrieving the container's ifindex in the host's | |
129 | * network namespace because we need it to move the device from the | |
130 | * host's network namespace to the container's network namespace later | |
131 | * on. | |
132 | */ | |
811ef482 CB |
133 | netdev->ifindex = if_nametoindex(veth2); |
134 | if (!netdev->ifindex) { | |
135 | ERROR("Failed to retrieve ifindex for \"%s\"", veth2); | |
136 | goto out_delete; | |
137 | } | |
138 | ||
139 | if (netdev->mtu) { | |
140 | if (lxc_safe_uint(netdev->mtu, &mtu) < 0) | |
141 | WARN("Failed to parse mtu"); | |
142 | else | |
143 | INFO("Retrieved mtu %d", mtu); | |
de4855a8 | 144 | } else if (netdev->link[0] != '\0') { |
811ef482 CB |
145 | bridge_index = if_nametoindex(netdev->link); |
146 | if (bridge_index) { | |
147 | mtu = netdev_get_mtu(bridge_index); | |
148 | INFO("Retrieved mtu %d from %s", mtu, netdev->link); | |
149 | } else { | |
150 | mtu = netdev_get_mtu(netdev->ifindex); | |
151 | INFO("Retrieved mtu %d from %s", mtu, veth2); | |
152 | } | |
153 | } | |
154 | ||
155 | if (mtu) { | |
156 | err = lxc_netdev_set_mtu(veth1, mtu); | |
157 | if (!err) | |
158 | err = lxc_netdev_set_mtu(veth2, mtu); | |
6d1400b5 | 159 | |
811ef482 | 160 | if (err) { |
6d1400b5 | 161 | errno = -err; |
162 | SYSERROR("Failed to set mtu \"%d\" for veth pair \"%s\" " | |
163 | "and \"%s\"", mtu, veth1, veth2); | |
811ef482 CB |
164 | goto out_delete; |
165 | } | |
166 | } | |
167 | ||
de4855a8 | 168 | if (netdev->link[0] != '\0') { |
811ef482 CB |
169 | err = lxc_bridge_attach(netdev->link, veth1); |
170 | if (err) { | |
6d1400b5 | 171 | errno = -err; |
172 | SYSERROR("Failed to attach \"%s\" to bridge \"%s\"", | |
173 | veth1, netdev->link); | |
811ef482 CB |
174 | goto out_delete; |
175 | } | |
176 | INFO("Attached \"%s\" to bridge \"%s\"", veth1, netdev->link); | |
177 | } | |
178 | ||
179 | err = lxc_netdev_up(veth1); | |
180 | if (err) { | |
6d1400b5 | 181 | errno = -err; |
182 | SYSERROR("Failed to set \"%s\" up", veth1); | |
811ef482 CB |
183 | goto out_delete; |
184 | } | |
185 | ||
186 | if (netdev->upscript) { | |
14a7b0f9 CB |
187 | char *argv[] = { |
188 | "veth", | |
189 | netdev->link, | |
990b9ac3 | 190 | veth1, |
14a7b0f9 CB |
191 | NULL, |
192 | }; | |
193 | ||
194 | err = run_script_argv(handler->name, | |
195 | handler->conf->hooks_version, "net", | |
196 | netdev->upscript, "up", argv); | |
197 | if (err < 0) | |
811ef482 CB |
198 | goto out_delete; |
199 | } | |
200 | ||
201 | DEBUG("Instantiated veth \"%s/%s\", index is \"%d\"", veth1, veth2, | |
202 | netdev->ifindex); | |
203 | ||
204 | return 0; | |
205 | ||
206 | out_delete: | |
207 | if (netdev->ifindex != 0) | |
208 | lxc_netdev_delete_by_name(veth1); | |
811ef482 CB |
209 | return -1; |
210 | } | |
211 | ||
212 | static int instantiate_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
213 | { | |
214 | char peerbuf[IFNAMSIZ], *peer; | |
215 | int err; | |
216 | ||
de4855a8 | 217 | if (netdev->link[0] == '\0') { |
811ef482 CB |
218 | ERROR("No link for macvlan network device specified"); |
219 | return -1; | |
220 | } | |
221 | ||
222 | err = snprintf(peerbuf, sizeof(peerbuf), "mcXXXXXX"); | |
223 | if (err < 0 || (size_t)err >= sizeof(peerbuf)) | |
224 | return -1; | |
225 | ||
226 | peer = lxc_mkifname(peerbuf); | |
227 | if (!peer) | |
228 | return -1; | |
229 | ||
230 | err = lxc_macvlan_create(netdev->link, peer, | |
231 | netdev->priv.macvlan_attr.mode); | |
232 | if (err) { | |
6d1400b5 | 233 | errno = -err; |
234 | SYSERROR("Failed to create macvlan interface \"%s\" on \"%s\"", | |
235 | peer, netdev->link); | |
966e9f1f | 236 | goto on_error; |
811ef482 CB |
237 | } |
238 | ||
239 | netdev->ifindex = if_nametoindex(peer); | |
240 | if (!netdev->ifindex) { | |
241 | ERROR("Failed to retrieve ifindex for \"%s\"", peer); | |
966e9f1f | 242 | goto on_error; |
811ef482 CB |
243 | } |
244 | ||
245 | if (netdev->upscript) { | |
14a7b0f9 CB |
246 | char *argv[] = { |
247 | "macvlan", | |
248 | netdev->link, | |
249 | NULL, | |
250 | }; | |
251 | ||
252 | err = run_script_argv(handler->name, | |
253 | handler->conf->hooks_version, "net", | |
254 | netdev->upscript, "up", argv); | |
255 | if (err < 0) | |
966e9f1f | 256 | goto on_error; |
811ef482 CB |
257 | } |
258 | ||
259 | DEBUG("Instantiated macvlan \"%s\" with ifindex is %d and mode %d", | |
260 | peer, netdev->ifindex, netdev->priv.macvlan_attr.mode); | |
261 | ||
262 | return 0; | |
966e9f1f CB |
263 | |
264 | on_error: | |
811ef482 | 265 | lxc_netdev_delete_by_name(peer); |
811ef482 CB |
266 | return -1; |
267 | } | |
268 | ||
269 | static int instantiate_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
270 | { | |
271 | char peer[IFNAMSIZ]; | |
272 | int err; | |
273 | static uint16_t vlan_cntr = 0; | |
274 | unsigned int mtu = 0; | |
275 | ||
de4855a8 | 276 | if (netdev->link[0] == '\0') { |
811ef482 CB |
277 | ERROR("No link for vlan network device specified"); |
278 | return -1; | |
279 | } | |
280 | ||
281 | err = snprintf(peer, sizeof(peer), "vlan%d-%d", netdev->priv.vlan_attr.vid, vlan_cntr++); | |
282 | if (err < 0 || (size_t)err >= sizeof(peer)) | |
283 | return -1; | |
284 | ||
285 | err = lxc_vlan_create(netdev->link, peer, netdev->priv.vlan_attr.vid); | |
286 | if (err) { | |
6d1400b5 | 287 | errno = -err; |
288 | SYSERROR("Failed to create vlan interface \"%s\" on \"%s\"", | |
289 | peer, netdev->link); | |
811ef482 CB |
290 | return -1; |
291 | } | |
292 | ||
293 | netdev->ifindex = if_nametoindex(peer); | |
294 | if (!netdev->ifindex) { | |
295 | ERROR("Failed to retrieve ifindex for \"%s\"", peer); | |
296 | lxc_netdev_delete_by_name(peer); | |
297 | return -1; | |
298 | } | |
299 | ||
300 | DEBUG("Instantiated vlan \"%s\" with ifindex is \"%d\" (vlan1000)", | |
301 | peer, netdev->ifindex); | |
302 | if (netdev->mtu) { | |
303 | if (lxc_safe_uint(netdev->mtu, &mtu) < 0) { | |
304 | ERROR("Failed to retrieve mtu from \"%d\"/\"%s\".", | |
305 | netdev->ifindex, | |
de4855a8 | 306 | netdev->name[0] != '\0' ? netdev->name : "(null)"); |
811ef482 CB |
307 | return -1; |
308 | } | |
6d1400b5 | 309 | |
811ef482 CB |
310 | err = lxc_netdev_set_mtu(peer, mtu); |
311 | if (err) { | |
6d1400b5 | 312 | errno = -err; |
313 | SYSERROR("Failed to set mtu \"%s\" for \"%s\"", | |
314 | netdev->mtu, peer); | |
811ef482 CB |
315 | lxc_netdev_delete_by_name(peer); |
316 | return -1; | |
317 | } | |
318 | } | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
323 | static int instantiate_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
324 | { | |
14a7b0f9 CB |
325 | int ret; |
326 | char *argv[] = { | |
327 | "phys", | |
328 | netdev->link, | |
329 | NULL, | |
330 | }; | |
331 | ||
de4855a8 | 332 | if (netdev->link[0] == '\0') { |
811ef482 CB |
333 | ERROR("No link for physical interface specified"); |
334 | return -1; | |
335 | } | |
336 | ||
790255cf CB |
337 | /* Note that we're retrieving the container's ifindex in the host's |
338 | * network namespace because we need it to move the device from the | |
339 | * host's network namespace to the container's network namespace later | |
340 | * on. | |
341 | * Note that netdev->link will contain the name of the physical network | |
342 | * device in the host's namespace. | |
343 | */ | |
811ef482 CB |
344 | netdev->ifindex = if_nametoindex(netdev->link); |
345 | if (!netdev->ifindex) { | |
346 | ERROR("Failed to retrieve ifindex for \"%s\"", netdev->link); | |
347 | return -1; | |
348 | } | |
349 | ||
790255cf CB |
350 | /* Store the ifindex of the host's network device in the host's |
351 | * namespace. | |
352 | */ | |
353 | netdev->priv.phys_attr.ifindex = netdev->ifindex; | |
354 | ||
14a7b0f9 CB |
355 | if (!netdev->upscript) |
356 | return 0; | |
357 | ||
358 | ret = run_script_argv(handler->name, handler->conf->hooks_version, | |
359 | "net", netdev->upscript, "up", argv); | |
360 | if (ret < 0) | |
361 | return -1; | |
811ef482 CB |
362 | |
363 | return 0; | |
364 | } | |
365 | ||
366 | static int instantiate_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
367 | { | |
14a7b0f9 CB |
368 | int ret; |
369 | char *argv[] = { | |
370 | "empty", | |
371 | NULL, | |
372 | }; | |
373 | ||
811ef482 | 374 | netdev->ifindex = 0; |
14a7b0f9 CB |
375 | if (!netdev->upscript) |
376 | return 0; | |
377 | ||
378 | ret = run_script_argv(handler->name, handler->conf->hooks_version, | |
379 | "net", netdev->upscript, "up", argv); | |
380 | if (ret < 0) | |
381 | return -1; | |
382 | ||
811ef482 CB |
383 | return 0; |
384 | } | |
385 | ||
386 | static int instantiate_none(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
387 | { | |
388 | netdev->ifindex = 0; | |
389 | return 0; | |
390 | } | |
391 | ||
392 | static instantiate_cb netdev_conf[LXC_NET_MAXCONFTYPE + 1] = { | |
393 | [LXC_NET_VETH] = instantiate_veth, | |
394 | [LXC_NET_MACVLAN] = instantiate_macvlan, | |
395 | [LXC_NET_VLAN] = instantiate_vlan, | |
396 | [LXC_NET_PHYS] = instantiate_phys, | |
397 | [LXC_NET_EMPTY] = instantiate_empty, | |
398 | [LXC_NET_NONE] = instantiate_none, | |
399 | }; | |
400 | ||
401 | static int shutdown_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
402 | { | |
14a7b0f9 CB |
403 | int ret; |
404 | char *argv[] = { | |
405 | "veth", | |
406 | netdev->link, | |
407 | NULL, | |
408 | NULL, | |
409 | }; | |
410 | ||
411 | if (!netdev->downscript) | |
412 | return 0; | |
811ef482 | 413 | |
de4855a8 | 414 | if (netdev->priv.veth_attr.pair[0] != '\0') |
14a7b0f9 | 415 | argv[2] = netdev->priv.veth_attr.pair; |
811ef482 | 416 | else |
14a7b0f9 CB |
417 | argv[2] = netdev->priv.veth_attr.veth1; |
418 | ||
419 | ret = run_script_argv(handler->name, | |
420 | handler->conf->hooks_version, "net", | |
421 | netdev->downscript, "down", argv); | |
422 | if (ret < 0) | |
423 | return -1; | |
811ef482 | 424 | |
811ef482 CB |
425 | return 0; |
426 | } | |
427 | ||
428 | static int shutdown_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
429 | { | |
14a7b0f9 CB |
430 | int ret; |
431 | char *argv[] = { | |
432 | "macvlan", | |
433 | netdev->link, | |
434 | NULL, | |
435 | }; | |
436 | ||
437 | if (!netdev->downscript) | |
438 | return 0; | |
439 | ||
440 | ret = run_script_argv(handler->name, handler->conf->hooks_version, | |
441 | "net", netdev->downscript, "down", argv); | |
442 | if (ret < 0) | |
443 | return -1; | |
811ef482 | 444 | |
811ef482 CB |
445 | return 0; |
446 | } | |
447 | ||
448 | static int shutdown_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
449 | { | |
450 | return 0; | |
451 | } | |
452 | ||
453 | static int shutdown_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
454 | { | |
14a7b0f9 CB |
455 | int ret; |
456 | char *argv[] = { | |
457 | "phys", | |
458 | netdev->link, | |
459 | NULL, | |
460 | }; | |
461 | ||
462 | if (!netdev->downscript) | |
463 | return 0; | |
464 | ||
465 | ret = run_script_argv(handler->name, handler->conf->hooks_version, | |
466 | "net", netdev->downscript, "down", argv); | |
467 | if (ret < 0) | |
468 | return -1; | |
811ef482 | 469 | |
811ef482 CB |
470 | return 0; |
471 | } | |
472 | ||
473 | static int shutdown_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
474 | { | |
14a7b0f9 CB |
475 | int ret; |
476 | char *argv[] = { | |
477 | "empty", | |
478 | NULL, | |
479 | }; | |
480 | ||
481 | if (!netdev->downscript) | |
482 | return 0; | |
483 | ||
484 | ret = run_script_argv(handler->name, handler->conf->hooks_version, | |
485 | "net", netdev->downscript, "down", argv); | |
486 | if (ret < 0) | |
487 | return -1; | |
811ef482 | 488 | |
811ef482 CB |
489 | return 0; |
490 | } | |
491 | ||
492 | static int shutdown_none(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
493 | { | |
494 | return 0; | |
495 | } | |
496 | ||
497 | static instantiate_cb netdev_deconf[LXC_NET_MAXCONFTYPE + 1] = { | |
498 | [LXC_NET_VETH] = shutdown_veth, | |
499 | [LXC_NET_MACVLAN] = shutdown_macvlan, | |
500 | [LXC_NET_VLAN] = shutdown_vlan, | |
501 | [LXC_NET_PHYS] = shutdown_phys, | |
502 | [LXC_NET_EMPTY] = shutdown_empty, | |
503 | [LXC_NET_NONE] = shutdown_none, | |
504 | }; | |
505 | ||
ebc73a67 | 506 | int lxc_netdev_move_by_index(int ifindex, pid_t pid, const char *ifname) |
0ad19a3f | 507 | { |
ebc73a67 | 508 | int err; |
0ad19a3f | 509 | struct nl_handler nlh; |
06f976ca | 510 | struct ifinfomsg *ifi; |
ebc73a67 | 511 | struct nlmsg *nlmsg = NULL; |
0ad19a3f | 512 | |
3cfc0f3a MN |
513 | err = netlink_open(&nlh, NETLINK_ROUTE); |
514 | if (err) | |
515 | return err; | |
0ad19a3f | 516 | |
3cfc0f3a | 517 | err = -ENOMEM; |
0ad19a3f | 518 | nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE); |
519 | if (!nlmsg) | |
520 | goto out; | |
521 | ||
ebc73a67 | 522 | nlmsg->nlmsghdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; |
06f976ca SZ |
523 | nlmsg->nlmsghdr->nlmsg_type = RTM_NEWLINK; |
524 | ||
525 | ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg)); | |
25a9939b WC |
526 | if (!ifi) |
527 | goto out; | |
06f976ca SZ |
528 | ifi->ifi_family = AF_UNSPEC; |
529 | ifi->ifi_index = ifindex; | |
0ad19a3f | 530 | |
531 | if (nla_put_u32(nlmsg, IFLA_NET_NS_PID, pid)) | |
532 | goto out; | |
533 | ||
8d357196 DY |
534 | if (ifname != NULL) { |
535 | if (nla_put_string(nlmsg, IFLA_IFNAME, ifname)) | |
536 | goto out; | |
537 | } | |
538 | ||
3cfc0f3a | 539 | err = netlink_transaction(&nlh, nlmsg, nlmsg); |
0ad19a3f | 540 | out: |
541 | netlink_close(&nlh); | |
542 | nlmsg_free(nlmsg); | |
543 | return err; | |
544 | } | |
545 | ||
ebc73a67 CB |
546 | /* If we are asked to move a wireless interface, then we must actually move its |
547 | * phyN device. Detect that condition and return the physname here. The physname | |
548 | * will be passed to lxc_netdev_move_wlan() which will free it when done. | |
e5848d39 SH |
549 | */ |
550 | #define PHYSNAME "/sys/class/net/%s/phy80211/name" | |
ebc73a67 | 551 | static char *is_wlan(const char *ifname) |
e5848d39 | 552 | { |
b0293710 | 553 | __do_free char *path = NULL; |
ebc73a67 | 554 | int i, ret; |
e5848d39 | 555 | long physlen; |
ebc73a67 | 556 | size_t len; |
e5848d39 | 557 | FILE *f; |
ebc73a67 | 558 | char *physname = NULL; |
e5848d39 | 559 | |
ebc73a67 | 560 | len = strlen(ifname) + strlen(PHYSNAME) - 1; |
95ea3d1f | 561 | path = must_realloc(NULL, len + 1); |
e5848d39 | 562 | ret = snprintf(path, len, PHYSNAME, ifname); |
ebc73a67 | 563 | if (ret < 0 || (size_t)ret >= len) |
e5848d39 | 564 | goto bad; |
ebc73a67 | 565 | |
ebc73a67 CB |
566 | f = fopen(path, "r"); |
567 | if (!f) | |
e5848d39 | 568 | goto bad; |
ebc73a67 | 569 | |
1a0e70ac | 570 | /* Feh - sb.st_size is always 4096. */ |
e5848d39 SH |
571 | fseek(f, 0, SEEK_END); |
572 | physlen = ftell(f); | |
573 | fseek(f, 0, SEEK_SET); | |
7d1cde93 SX |
574 | if (physlen < 0) { |
575 | fclose(f); | |
0382c0da | 576 | goto bad; |
7d1cde93 | 577 | } |
ebc73a67 CB |
578 | |
579 | physname = malloc(physlen + 1); | |
ee54ea9a | 580 | if (!physname) { |
acf47e1b | 581 | fclose(f); |
e5848d39 | 582 | goto bad; |
ee54ea9a | 583 | } |
ebc73a67 CB |
584 | |
585 | memset(physname, 0, physlen + 1); | |
e5848d39 SH |
586 | ret = fread(physname, 1, physlen, f); |
587 | fclose(f); | |
588 | if (ret < 0) | |
589 | goto bad; | |
590 | ||
ebc73a67 | 591 | for (i = 0; i < physlen; i++) { |
e5848d39 SH |
592 | if (physname[i] == '\n') |
593 | physname[i] = '\0'; | |
ebc73a67 | 594 | |
e5848d39 SH |
595 | if (physname[i] == '\0') |
596 | break; | |
597 | } | |
598 | ||
599 | return physname; | |
600 | ||
601 | bad: | |
f10fad2f | 602 | free(physname); |
e5848d39 SH |
603 | return NULL; |
604 | } | |
605 | ||
ebc73a67 CB |
606 | static int lxc_netdev_rename_by_name_in_netns(pid_t pid, const char *old, |
607 | const char *new) | |
e5848d39 | 608 | { |
ebc73a67 | 609 | pid_t fpid; |
e5848d39 | 610 | |
ebc73a67 | 611 | fpid = fork(); |
e5848d39 SH |
612 | if (fpid < 0) |
613 | return -1; | |
ebc73a67 | 614 | |
e5848d39 SH |
615 | if (fpid != 0) |
616 | return wait_for_pid(fpid); | |
ebc73a67 | 617 | |
e5848d39 SH |
618 | if (!switch_to_ns(pid, "net")) |
619 | return -1; | |
ebc73a67 | 620 | |
05ec44f8 | 621 | _exit(lxc_netdev_rename_by_name(old, new)); |
e5848d39 SH |
622 | } |
623 | ||
ebc73a67 CB |
624 | static int lxc_netdev_move_wlan(char *physname, const char *ifname, pid_t pid, |
625 | const char *newname) | |
e5848d39 | 626 | { |
e5848d39 | 627 | char *cmd; |
ebc73a67 CB |
628 | pid_t fpid; |
629 | int err = -1; | |
e5848d39 SH |
630 | |
631 | /* Move phyN into the container. TODO - do this using netlink. | |
ebc73a67 CB |
632 | * However, IIUC this involves a bit more complicated work to talk to |
633 | * the 80211 module, so for now just call out to iw. | |
e5848d39 SH |
634 | */ |
635 | cmd = on_path("iw", NULL); | |
636 | if (!cmd) | |
637 | goto out1; | |
638 | free(cmd); | |
639 | ||
640 | fpid = fork(); | |
641 | if (fpid < 0) | |
642 | goto out1; | |
ebc73a67 | 643 | |
e5848d39 SH |
644 | if (fpid == 0) { |
645 | char pidstr[30]; | |
646 | sprintf(pidstr, "%d", pid); | |
ebc73a67 CB |
647 | execlp("iw", "iw", "phy", physname, "set", "netns", pidstr, |
648 | (char *)NULL); | |
ebd582ae | 649 | _exit(EXIT_FAILURE); |
e5848d39 | 650 | } |
ebc73a67 | 651 | |
e5848d39 SH |
652 | if (wait_for_pid(fpid)) |
653 | goto out1; | |
654 | ||
655 | err = 0; | |
656 | if (newname) | |
657 | err = lxc_netdev_rename_by_name_in_netns(pid, ifname, newname); | |
658 | ||
659 | out1: | |
660 | free(physname); | |
661 | return err; | |
662 | } | |
663 | ||
8d357196 | 664 | int lxc_netdev_move_by_name(const char *ifname, pid_t pid, const char* newname) |
8befa924 SH |
665 | { |
666 | int index; | |
e5848d39 | 667 | char *physname; |
8befa924 | 668 | |
8befa924 SH |
669 | if (!ifname) |
670 | return -EINVAL; | |
671 | ||
32571606 | 672 | index = if_nametoindex(ifname); |
49428bf3 DY |
673 | if (!index) |
674 | return -EINVAL; | |
32571606 | 675 | |
ebc73a67 CB |
676 | physname = is_wlan(ifname); |
677 | if (physname) | |
e5848d39 SH |
678 | return lxc_netdev_move_wlan(physname, ifname, pid, newname); |
679 | ||
8d357196 | 680 | return lxc_netdev_move_by_index(index, pid, newname); |
8befa924 SH |
681 | } |
682 | ||
b84f58b9 | 683 | int lxc_netdev_delete_by_index(int ifindex) |
0ad19a3f | 684 | { |
b84f58b9 | 685 | int err; |
ebc73a67 CB |
686 | struct ifinfomsg *ifi; |
687 | struct nl_handler nlh; | |
688 | struct nlmsg *answer = NULL, *nlmsg = NULL; | |
0ad19a3f | 689 | |
3cfc0f3a MN |
690 | err = netlink_open(&nlh, NETLINK_ROUTE); |
691 | if (err) | |
692 | return err; | |
0ad19a3f | 693 | |
3cfc0f3a | 694 | err = -ENOMEM; |
0ad19a3f | 695 | nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE); |
696 | if (!nlmsg) | |
697 | goto out; | |
698 | ||
06f976ca | 699 | answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE); |
0ad19a3f | 700 | if (!answer) |
701 | goto out; | |
702 | ||
ebc73a67 | 703 | nlmsg->nlmsghdr->nlmsg_flags = NLM_F_ACK | NLM_F_REQUEST; |
06f976ca SZ |
704 | nlmsg->nlmsghdr->nlmsg_type = RTM_DELLINK; |
705 | ||
706 | ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg)); | |
25a9939b WC |
707 | if (!ifi) |
708 | goto out; | |
06f976ca SZ |
709 | ifi->ifi_family = AF_UNSPEC; |
710 | ifi->ifi_index = ifindex; | |
0ad19a3f | 711 | |
3cfc0f3a | 712 | err = netlink_transaction(&nlh, nlmsg, answer); |
0ad19a3f | 713 | out: |
714 | netlink_close(&nlh); | |
715 | nlmsg_free(answer); | |
716 | nlmsg_free(nlmsg); | |
717 | return err; | |
718 | } | |
719 | ||
b84f58b9 DL |
720 | int lxc_netdev_delete_by_name(const char *name) |
721 | { | |
722 | int index; | |
723 | ||
724 | index = if_nametoindex(name); | |
725 | if (!index) | |
726 | return -EINVAL; | |
727 | ||
728 | return lxc_netdev_delete_by_index(index); | |
729 | } | |
730 | ||
731 | int lxc_netdev_rename_by_index(int ifindex, const char *newname) | |
b9a5bb58 | 732 | { |
ebc73a67 | 733 | int err, len; |
06f976ca | 734 | struct ifinfomsg *ifi; |
ebc73a67 CB |
735 | struct nl_handler nlh; |
736 | struct nlmsg *answer = NULL, *nlmsg = NULL; | |
b9a5bb58 | 737 | |
3cfc0f3a MN |
738 | err = netlink_open(&nlh, NETLINK_ROUTE); |
739 | if (err) | |
740 | return err; | |
b9a5bb58 | 741 | |
b84f58b9 | 742 | len = strlen(newname); |
dae3fdf6 | 743 | if (len == 1 || len >= IFNAMSIZ) |
b84f58b9 DL |
744 | goto out; |
745 | ||
3cfc0f3a | 746 | err = -ENOMEM; |
b9a5bb58 DL |
747 | nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE); |
748 | if (!nlmsg) | |
749 | goto out; | |
750 | ||
06f976ca | 751 | answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE); |
b9a5bb58 DL |
752 | if (!answer) |
753 | goto out; | |
754 | ||
ebc73a67 | 755 | nlmsg->nlmsghdr->nlmsg_flags = NLM_F_ACK | NLM_F_REQUEST; |
06f976ca SZ |
756 | nlmsg->nlmsghdr->nlmsg_type = RTM_NEWLINK; |
757 | ||
758 | ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg)); | |
25a9939b WC |
759 | if (!ifi) |
760 | goto out; | |
06f976ca SZ |
761 | ifi->ifi_family = AF_UNSPEC; |
762 | ifi->ifi_index = ifindex; | |
b84f58b9 DL |
763 | |
764 | if (nla_put_string(nlmsg, IFLA_IFNAME, newname)) | |
765 | goto out; | |
b9a5bb58 | 766 | |
3cfc0f3a | 767 | err = netlink_transaction(&nlh, nlmsg, answer); |
b9a5bb58 DL |
768 | out: |
769 | netlink_close(&nlh); | |
770 | nlmsg_free(answer); | |
771 | nlmsg_free(nlmsg); | |
772 | return err; | |
773 | } | |
774 | ||
b84f58b9 DL |
775 | int lxc_netdev_rename_by_name(const char *oldname, const char *newname) |
776 | { | |
777 | int len, index; | |
778 | ||
779 | len = strlen(oldname); | |
dae3fdf6 | 780 | if (len == 1 || len >= IFNAMSIZ) |
b84f58b9 DL |
781 | return -EINVAL; |
782 | ||
783 | index = if_nametoindex(oldname); | |
784 | if (!index) | |
785 | return -EINVAL; | |
786 | ||
787 | return lxc_netdev_rename_by_index(index, newname); | |
788 | } | |
789 | ||
8befa924 | 790 | int netdev_set_flag(const char *name, int flag) |
0ad19a3f | 791 | { |
ebc73a67 | 792 | int err, index, len; |
06f976ca | 793 | struct ifinfomsg *ifi; |
ebc73a67 CB |
794 | struct nl_handler nlh; |
795 | struct nlmsg *answer = NULL, *nlmsg = NULL; | |
0ad19a3f | 796 | |
3cfc0f3a MN |
797 | err = netlink_open(&nlh, NETLINK_ROUTE); |
798 | if (err) | |
799 | return err; | |
0ad19a3f | 800 | |
3cfc0f3a | 801 | err = -EINVAL; |
0ad19a3f | 802 | len = strlen(name); |
dae3fdf6 | 803 | if (len == 1 || len >= IFNAMSIZ) |
0ad19a3f | 804 | goto out; |
805 | ||
3cfc0f3a | 806 | err = -ENOMEM; |
0ad19a3f | 807 | nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE); |
808 | if (!nlmsg) | |
809 | goto out; | |
810 | ||
06f976ca | 811 | answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE); |
0ad19a3f | 812 | if (!answer) |
813 | goto out; | |
814 | ||
3cfc0f3a | 815 | err = -EINVAL; |
0ad19a3f | 816 | index = if_nametoindex(name); |
817 | if (!index) | |
818 | goto out; | |
819 | ||
ebc73a67 | 820 | nlmsg->nlmsghdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; |
06f976ca SZ |
821 | nlmsg->nlmsghdr->nlmsg_type = RTM_NEWLINK; |
822 | ||
823 | ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg)); | |
25a9939b WC |
824 | if (!ifi) { |
825 | err = -ENOMEM; | |
826 | goto out; | |
827 | } | |
06f976ca SZ |
828 | ifi->ifi_family = AF_UNSPEC; |
829 | ifi->ifi_index = index; | |
830 | ifi->ifi_change |= IFF_UP; | |
831 | ifi->ifi_flags |= flag; | |
0ad19a3f | 832 | |
833 | err = netlink_transaction(&nlh, nlmsg, answer); | |
0ad19a3f | 834 | out: |
835 | netlink_close(&nlh); | |
836 | nlmsg_free(nlmsg); | |
837 | nlmsg_free(answer); | |
838 | return err; | |
839 | } | |
840 | ||
ebc73a67 | 841 | int netdev_get_flag(const char *name, int *flag) |
efa1cf45 | 842 | { |
ebc73a67 | 843 | int err, index, len; |
a4318300 | 844 | struct ifinfomsg *ifi; |
ebc73a67 CB |
845 | struct nl_handler nlh; |
846 | struct nlmsg *answer = NULL, *nlmsg = NULL; | |
efa1cf45 DY |
847 | |
848 | if (!name) | |
849 | return -EINVAL; | |
850 | ||
851 | err = netlink_open(&nlh, NETLINK_ROUTE); | |
852 | if (err) | |
853 | return err; | |
854 | ||
855 | err = -EINVAL; | |
856 | len = strlen(name); | |
857 | if (len == 1 || len >= IFNAMSIZ) | |
858 | goto out; | |
859 | ||
860 | err = -ENOMEM; | |
861 | nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE); | |
862 | if (!nlmsg) | |
863 | goto out; | |
864 | ||
06f976ca | 865 | answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE); |
efa1cf45 DY |
866 | if (!answer) |
867 | goto out; | |
868 | ||
869 | err = -EINVAL; | |
870 | index = if_nametoindex(name); | |
871 | if (!index) | |
872 | goto out; | |
873 | ||
06f976ca SZ |
874 | nlmsg->nlmsghdr->nlmsg_flags = NLM_F_REQUEST; |
875 | nlmsg->nlmsghdr->nlmsg_type = RTM_GETLINK; | |
876 | ||
877 | ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg)); | |
25a9939b WC |
878 | if (!ifi) { |
879 | err = -ENOMEM; | |
880 | goto out; | |
881 | } | |
06f976ca SZ |
882 | ifi->ifi_family = AF_UNSPEC; |
883 | ifi->ifi_index = index; | |
efa1cf45 DY |
884 | |
885 | err = netlink_transaction(&nlh, nlmsg, answer); | |
886 | if (err) | |
887 | goto out; | |
888 | ||
06f976ca | 889 | ifi = NLMSG_DATA(answer->nlmsghdr); |
efa1cf45 DY |
890 | |
891 | *flag = ifi->ifi_flags; | |
892 | out: | |
893 | netlink_close(&nlh); | |
894 | nlmsg_free(nlmsg); | |
895 | nlmsg_free(answer); | |
896 | return err; | |
897 | } | |
898 | ||
899 | /* | |
900 | * \brief Check a interface is up or not. | |
901 | * | |
902 | * \param name: name for the interface. | |
903 | * | |
904 | * \return int. | |
905 | * 0 means interface is down. | |
906 | * 1 means interface is up. | |
907 | * Others means error happened, and ret-value is the error number. | |
908 | */ | |
ebc73a67 | 909 | int lxc_netdev_isup(const char *name) |
efa1cf45 | 910 | { |
ebc73a67 | 911 | int err, flag; |
efa1cf45 DY |
912 | |
913 | err = netdev_get_flag(name, &flag); | |
914 | if (err) | |
ebc73a67 CB |
915 | return err; |
916 | ||
efa1cf45 DY |
917 | if (flag & IFF_UP) |
918 | return 1; | |
ebc73a67 | 919 | |
efa1cf45 | 920 | return 0; |
efa1cf45 DY |
921 | } |
922 | ||
0130df54 SH |
923 | int netdev_get_mtu(int ifindex) |
924 | { | |
ebc73a67 | 925 | int answer_len, err, res; |
0130df54 | 926 | struct nl_handler nlh; |
06f976ca | 927 | struct ifinfomsg *ifi; |
0130df54 | 928 | struct nlmsghdr *msg; |
ebc73a67 CB |
929 | int readmore = 0, recv_len = 0; |
930 | struct nlmsg *answer = NULL, *nlmsg = NULL; | |
0130df54 SH |
931 | |
932 | err = netlink_open(&nlh, NETLINK_ROUTE); | |
933 | if (err) | |
934 | return err; | |
935 | ||
936 | err = -ENOMEM; | |
937 | nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE); | |
938 | if (!nlmsg) | |
939 | goto out; | |
940 | ||
06f976ca | 941 | answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE); |
0130df54 SH |
942 | if (!answer) |
943 | goto out; | |
944 | ||
945 | /* Save the answer buffer length, since it will be overwritten | |
946 | * on the first receive (and we might need to receive more than | |
ebc73a67 CB |
947 | * once. |
948 | */ | |
06f976ca SZ |
949 | answer_len = answer->nlmsghdr->nlmsg_len; |
950 | ||
ebc73a67 | 951 | nlmsg->nlmsghdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP; |
06f976ca | 952 | nlmsg->nlmsghdr->nlmsg_type = RTM_GETLINK; |
0130df54 | 953 | |
06f976ca | 954 | ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg)); |
25a9939b WC |
955 | if (!ifi) |
956 | goto out; | |
06f976ca | 957 | ifi->ifi_family = AF_UNSPEC; |
0130df54 SH |
958 | |
959 | /* Send the request for addresses, which returns all addresses | |
960 | * on all interfaces. */ | |
961 | err = netlink_send(&nlh, nlmsg); | |
962 | if (err < 0) | |
963 | goto out; | |
964 | ||
6ce39620 CB |
965 | #pragma GCC diagnostic push |
966 | #pragma GCC diagnostic ignored "-Wcast-align" | |
967 | ||
0130df54 SH |
968 | do { |
969 | /* Restore the answer buffer length, it might have been | |
ebc73a67 CB |
970 | * overwritten by a previous receive. |
971 | */ | |
06f976ca | 972 | answer->nlmsghdr->nlmsg_len = answer_len; |
0130df54 SH |
973 | |
974 | /* Get the (next) batch of reply messages */ | |
975 | err = netlink_rcv(&nlh, answer); | |
976 | if (err < 0) | |
977 | goto out; | |
978 | ||
979 | recv_len = err; | |
0130df54 SH |
980 | |
981 | /* Satisfy the typing for the netlink macros */ | |
06f976ca | 982 | msg = answer->nlmsghdr; |
0130df54 SH |
983 | |
984 | while (NLMSG_OK(msg, recv_len)) { | |
985 | ||
986 | /* Stop reading if we see an error message */ | |
987 | if (msg->nlmsg_type == NLMSG_ERROR) { | |
ebc73a67 CB |
988 | struct nlmsgerr *errmsg = |
989 | (struct nlmsgerr *)NLMSG_DATA(msg); | |
0130df54 SH |
990 | err = errmsg->error; |
991 | goto out; | |
992 | } | |
993 | ||
994 | /* Stop reading if we see a NLMSG_DONE message */ | |
995 | if (msg->nlmsg_type == NLMSG_DONE) { | |
996 | readmore = 0; | |
997 | break; | |
998 | } | |
999 | ||
06f976ca | 1000 | ifi = NLMSG_DATA(msg); |
0130df54 SH |
1001 | if (ifi->ifi_index == ifindex) { |
1002 | struct rtattr *rta = IFLA_RTA(ifi); | |
ebc73a67 CB |
1003 | int attr_len = |
1004 | msg->nlmsg_len - NLMSG_LENGTH(sizeof(*ifi)); | |
0130df54 | 1005 | res = 0; |
ebc73a67 CB |
1006 | while (RTA_OK(rta, attr_len)) { |
1007 | /* Found a local address for the | |
1008 | * requested interface, return it. | |
1009 | */ | |
0130df54 | 1010 | if (rta->rta_type == IFLA_MTU) { |
ebc73a67 CB |
1011 | memcpy(&res, RTA_DATA(rta), |
1012 | sizeof(int)); | |
0130df54 SH |
1013 | err = res; |
1014 | goto out; | |
1015 | } | |
1016 | rta = RTA_NEXT(rta, attr_len); | |
1017 | } | |
0130df54 SH |
1018 | } |
1019 | ||
ebc73a67 CB |
1020 | /* Keep reading more data from the socket if the last |
1021 | * message had the NLF_F_MULTI flag set. | |
1022 | */ | |
0130df54 SH |
1023 | readmore = (msg->nlmsg_flags & NLM_F_MULTI); |
1024 | ||
ebc73a67 | 1025 | /* Look at the next message received in this buffer. */ |
0130df54 SH |
1026 | msg = NLMSG_NEXT(msg, recv_len); |
1027 | } | |
1028 | } while (readmore); | |
1029 | ||
6ce39620 CB |
1030 | #pragma GCC diagnostic pop |
1031 | ||
ebc73a67 | 1032 | /* If we end up here, we didn't find any result, so signal an error. */ |
0130df54 SH |
1033 | err = -1; |
1034 | ||
1035 | out: | |
1036 | netlink_close(&nlh); | |
1037 | nlmsg_free(answer); | |
1038 | nlmsg_free(nlmsg); | |
1039 | return err; | |
1040 | } | |
1041 | ||
d472214b | 1042 | int lxc_netdev_set_mtu(const char *name, int mtu) |
75d09f83 | 1043 | { |
ebc73a67 | 1044 | int err, index, len; |
06f976ca | 1045 | struct ifinfomsg *ifi; |
ebc73a67 CB |
1046 | struct nl_handler nlh; |
1047 | struct nlmsg *answer = NULL, *nlmsg = NULL; | |
75d09f83 | 1048 | |
3cfc0f3a MN |
1049 | err = netlink_open(&nlh, NETLINK_ROUTE); |
1050 | if (err) | |
1051 | return err; | |
75d09f83 | 1052 | |
3cfc0f3a | 1053 | err = -EINVAL; |
75d09f83 | 1054 | len = strlen(name); |
dae3fdf6 | 1055 | if (len == 1 || len >= IFNAMSIZ) |
75d09f83 DL |
1056 | goto out; |
1057 | ||
3cfc0f3a | 1058 | err = -ENOMEM; |
75d09f83 DL |
1059 | nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE); |
1060 | if (!nlmsg) | |
1061 | goto out; | |
1062 | ||
06f976ca | 1063 | answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE); |
75d09f83 DL |
1064 | if (!answer) |
1065 | goto out; | |
1066 | ||
3cfc0f3a | 1067 | err = -EINVAL; |
75d09f83 DL |
1068 | index = if_nametoindex(name); |
1069 | if (!index) | |
1070 | goto out; | |
1071 | ||
ebc73a67 | 1072 | nlmsg->nlmsghdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; |
06f976ca SZ |
1073 | nlmsg->nlmsghdr->nlmsg_type = RTM_NEWLINK; |
1074 | ||
1075 | ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg)); | |
25a9939b WC |
1076 | if (!ifi) { |
1077 | err = -ENOMEM; | |
1078 | goto out; | |
1079 | } | |
06f976ca SZ |
1080 | ifi->ifi_family = AF_UNSPEC; |
1081 | ifi->ifi_index = index; | |
75d09f83 DL |
1082 | |
1083 | if (nla_put_u32(nlmsg, IFLA_MTU, mtu)) | |
1084 | goto out; | |
1085 | ||
1086 | err = netlink_transaction(&nlh, nlmsg, answer); | |
75d09f83 DL |
1087 | out: |
1088 | netlink_close(&nlh); | |
1089 | nlmsg_free(nlmsg); | |
1090 | nlmsg_free(answer); | |
1091 | return err; | |
1092 | } | |
1093 | ||
d472214b | 1094 | int lxc_netdev_up(const char *name) |
0ad19a3f | 1095 | { |
d472214b | 1096 | return netdev_set_flag(name, IFF_UP); |
0ad19a3f | 1097 | } |
1098 | ||
d472214b | 1099 | int lxc_netdev_down(const char *name) |
0ad19a3f | 1100 | { |
d472214b | 1101 | return netdev_set_flag(name, 0); |
0ad19a3f | 1102 | } |
1103 | ||
497353b6 | 1104 | int lxc_veth_create(const char *name1, const char *name2) |
0ad19a3f | 1105 | { |
ebc73a67 | 1106 | int err, len; |
06f976ca | 1107 | struct ifinfomsg *ifi; |
ebc73a67 | 1108 | struct nl_handler nlh; |
0ad19a3f | 1109 | struct rtattr *nest1, *nest2, *nest3; |
ebc73a67 | 1110 | struct nlmsg *answer = NULL, *nlmsg = NULL; |
0ad19a3f | 1111 | |
3cfc0f3a MN |
1112 | err = netlink_open(&nlh, NETLINK_ROUTE); |
1113 | if (err) | |
1114 | return err; | |
0ad19a3f | 1115 | |
3cfc0f3a | 1116 | err = -EINVAL; |
0ad19a3f | 1117 | len = strlen(name1); |
dae3fdf6 | 1118 | if (len == 1 || len >= IFNAMSIZ) |
0ad19a3f | 1119 | goto out; |
1120 | ||
1121 | len = strlen(name2); | |
dae3fdf6 | 1122 | if (len == 1 || len >= IFNAMSIZ) |
0ad19a3f | 1123 | goto out; |
1124 | ||
3cfc0f3a | 1125 | err = -ENOMEM; |
0ad19a3f | 1126 | nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE); |
1127 | if (!nlmsg) | |
1128 | goto out; | |
1129 | ||
06f976ca | 1130 | answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE); |
0ad19a3f | 1131 | if (!answer) |
1132 | goto out; | |
1133 | ||
06f976ca | 1134 | nlmsg->nlmsghdr->nlmsg_flags = |
ebc73a67 | 1135 | NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL | NLM_F_ACK; |
06f976ca SZ |
1136 | nlmsg->nlmsghdr->nlmsg_type = RTM_NEWLINK; |
1137 | ||
1138 | ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg)); | |
25a9939b WC |
1139 | if (!ifi) |
1140 | goto out; | |
06f976ca | 1141 | ifi->ifi_family = AF_UNSPEC; |
0ad19a3f | 1142 | |
3cfc0f3a | 1143 | err = -EINVAL; |
79e68309 | 1144 | nest1 = nla_begin_nested(nlmsg, IFLA_LINKINFO); |
0ad19a3f | 1145 | if (!nest1) |
1146 | goto out; | |
1147 | ||
1148 | if (nla_put_string(nlmsg, IFLA_INFO_KIND, "veth")) | |
1149 | goto out; | |
1150 | ||
1151 | nest2 = nla_begin_nested(nlmsg, IFLA_INFO_DATA); | |
1152 | if (!nest2) | |
1153 | goto out; | |
1154 | ||
1155 | nest3 = nla_begin_nested(nlmsg, VETH_INFO_PEER); | |
1156 | if (!nest3) | |
1157 | goto out; | |
1158 | ||
06f976ca | 1159 | ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg)); |
25a9939b WC |
1160 | if (!ifi) { |
1161 | err = -ENOMEM; | |
06f976ca | 1162 | goto out; |
25a9939b | 1163 | } |
0ad19a3f | 1164 | |
1165 | if (nla_put_string(nlmsg, IFLA_IFNAME, name2)) | |
1166 | goto out; | |
1167 | ||
1168 | nla_end_nested(nlmsg, nest3); | |
0ad19a3f | 1169 | nla_end_nested(nlmsg, nest2); |
0ad19a3f | 1170 | nla_end_nested(nlmsg, nest1); |
1171 | ||
1172 | if (nla_put_string(nlmsg, IFLA_IFNAME, name1)) | |
1173 | goto out; | |
1174 | ||
3cfc0f3a | 1175 | err = netlink_transaction(&nlh, nlmsg, answer); |
0ad19a3f | 1176 | out: |
1177 | netlink_close(&nlh); | |
1178 | nlmsg_free(answer); | |
1179 | nlmsg_free(nlmsg); | |
1180 | return err; | |
1181 | } | |
1182 | ||
ebc73a67 | 1183 | /* TODO: merge with lxc_macvlan_create */ |
7c11d57a | 1184 | int lxc_vlan_create(const char *master, const char *name, unsigned short vlanid) |
26c39028 | 1185 | { |
ebc73a67 | 1186 | int err, len, lindex; |
06f976ca | 1187 | struct ifinfomsg *ifi; |
ebc73a67 | 1188 | struct nl_handler nlh; |
26c39028 | 1189 | struct rtattr *nest, *nest2; |
ebc73a67 | 1190 | struct nlmsg *answer = NULL, *nlmsg = NULL; |
26c39028 | 1191 | |
3cfc0f3a MN |
1192 | err = netlink_open(&nlh, NETLINK_ROUTE); |
1193 | if (err) | |
1194 | return err; | |
26c39028 | 1195 | |
3cfc0f3a | 1196 | err = -EINVAL; |
26c39028 | 1197 | len = strlen(master); |
dae3fdf6 | 1198 | if (len == 1 || len >= IFNAMSIZ) |
26c39028 JHS |
1199 | goto err3; |
1200 | ||
1201 | len = strlen(name); | |
dae3fdf6 | 1202 | if (len == 1 || len >= IFNAMSIZ) |
26c39028 JHS |
1203 | goto err3; |
1204 | ||
3cfc0f3a | 1205 | err = -ENOMEM; |
26c39028 JHS |
1206 | nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE); |
1207 | if (!nlmsg) | |
1208 | goto err3; | |
1209 | ||
06f976ca | 1210 | answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE); |
26c39028 JHS |
1211 | if (!answer) |
1212 | goto err2; | |
1213 | ||
3cfc0f3a | 1214 | err = -EINVAL; |
26c39028 JHS |
1215 | lindex = if_nametoindex(master); |
1216 | if (!lindex) | |
1217 | goto err1; | |
1218 | ||
06f976ca | 1219 | nlmsg->nlmsghdr->nlmsg_flags = |
ebc73a67 | 1220 | NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL | NLM_F_ACK; |
06f976ca SZ |
1221 | nlmsg->nlmsghdr->nlmsg_type = RTM_NEWLINK; |
1222 | ||
1223 | ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg)); | |
25a9939b WC |
1224 | if (!ifi) { |
1225 | err = -ENOMEM; | |
1226 | goto err1; | |
1227 | } | |
06f976ca | 1228 | ifi->ifi_family = AF_UNSPEC; |
26c39028 | 1229 | |
79e68309 | 1230 | nest = nla_begin_nested(nlmsg, IFLA_LINKINFO); |
26c39028 JHS |
1231 | if (!nest) |
1232 | goto err1; | |
1233 | ||
1234 | if (nla_put_string(nlmsg, IFLA_INFO_KIND, "vlan")) | |
1235 | goto err1; | |
1236 | ||
1237 | nest2 = nla_begin_nested(nlmsg, IFLA_INFO_DATA); | |
1238 | if (!nest2) | |
1239 | goto err1; | |
e892973e | 1240 | |
26c39028 JHS |
1241 | if (nla_put_u16(nlmsg, IFLA_VLAN_ID, vlanid)) |
1242 | goto err1; | |
e892973e | 1243 | |
26c39028 | 1244 | nla_end_nested(nlmsg, nest2); |
26c39028 JHS |
1245 | nla_end_nested(nlmsg, nest); |
1246 | ||
1247 | if (nla_put_u32(nlmsg, IFLA_LINK, lindex)) | |
1248 | goto err1; | |
1249 | ||
1250 | if (nla_put_string(nlmsg, IFLA_IFNAME, name)) | |
1251 | goto err1; | |
1252 | ||
3cfc0f3a | 1253 | err = netlink_transaction(&nlh, nlmsg, answer); |
26c39028 JHS |
1254 | err1: |
1255 | nlmsg_free(answer); | |
1256 | err2: | |
1257 | nlmsg_free(nlmsg); | |
1258 | err3: | |
1259 | netlink_close(&nlh); | |
1260 | return err; | |
1261 | } | |
1262 | ||
e892973e | 1263 | int lxc_macvlan_create(const char *master, const char *name, int mode) |
0ad19a3f | 1264 | { |
ebc73a67 | 1265 | int err, index, len; |
06f976ca | 1266 | struct ifinfomsg *ifi; |
ebc73a67 | 1267 | struct nl_handler nlh; |
e892973e | 1268 | struct rtattr *nest, *nest2; |
ebc73a67 | 1269 | struct nlmsg *answer = NULL, *nlmsg = NULL; |
0ad19a3f | 1270 | |
3cfc0f3a MN |
1271 | err = netlink_open(&nlh, NETLINK_ROUTE); |
1272 | if (err) | |
1273 | return err; | |
0ad19a3f | 1274 | |
3cfc0f3a | 1275 | err = -EINVAL; |
0ad19a3f | 1276 | len = strlen(master); |
dae3fdf6 | 1277 | if (len == 1 || len >= IFNAMSIZ) |
0ad19a3f | 1278 | goto out; |
1279 | ||
1280 | len = strlen(name); | |
dae3fdf6 | 1281 | if (len == 1 || len >= IFNAMSIZ) |
0ad19a3f | 1282 | goto out; |
1283 | ||
3cfc0f3a | 1284 | err = -ENOMEM; |
0ad19a3f | 1285 | nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE); |
1286 | if (!nlmsg) | |
1287 | goto out; | |
1288 | ||
06f976ca | 1289 | answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE); |
0ad19a3f | 1290 | if (!answer) |
1291 | goto out; | |
1292 | ||
3cfc0f3a | 1293 | err = -EINVAL; |
0ad19a3f | 1294 | index = if_nametoindex(master); |
1295 | if (!index) | |
1296 | goto out; | |
1297 | ||
06f976ca | 1298 | nlmsg->nlmsghdr->nlmsg_flags = |
ebc73a67 | 1299 | NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL | NLM_F_ACK; |
06f976ca SZ |
1300 | nlmsg->nlmsghdr->nlmsg_type = RTM_NEWLINK; |
1301 | ||
1302 | ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg)); | |
25a9939b WC |
1303 | if (!ifi) { |
1304 | err = -ENOMEM; | |
1305 | goto out; | |
1306 | } | |
06f976ca | 1307 | ifi->ifi_family = AF_UNSPEC; |
0ad19a3f | 1308 | |
79e68309 | 1309 | nest = nla_begin_nested(nlmsg, IFLA_LINKINFO); |
0ad19a3f | 1310 | if (!nest) |
1311 | goto out; | |
1312 | ||
1313 | if (nla_put_string(nlmsg, IFLA_INFO_KIND, "macvlan")) | |
1314 | goto out; | |
1315 | ||
e892973e DL |
1316 | if (mode) { |
1317 | nest2 = nla_begin_nested(nlmsg, IFLA_INFO_DATA); | |
1318 | if (!nest2) | |
1319 | goto out; | |
1320 | ||
1321 | if (nla_put_u32(nlmsg, IFLA_MACVLAN_MODE, mode)) | |
1322 | goto out; | |
1323 | ||
1324 | nla_end_nested(nlmsg, nest2); | |
1325 | } | |
1326 | ||
0ad19a3f | 1327 | nla_end_nested(nlmsg, nest); |
1328 | ||
1329 | if (nla_put_u32(nlmsg, IFLA_LINK, index)) | |
1330 | goto out; | |
1331 | ||
1332 | if (nla_put_string(nlmsg, IFLA_IFNAME, name)) | |
1333 | goto out; | |
1334 | ||
3cfc0f3a | 1335 | err = netlink_transaction(&nlh, nlmsg, answer); |
0ad19a3f | 1336 | out: |
1337 | netlink_close(&nlh); | |
1338 | nlmsg_free(answer); | |
1339 | nlmsg_free(nlmsg); | |
1340 | return err; | |
1341 | } | |
1342 | ||
1343 | static int proc_sys_net_write(const char *path, const char *value) | |
1344 | { | |
ebc73a67 CB |
1345 | int fd; |
1346 | int err = 0; | |
0ad19a3f | 1347 | |
1348 | fd = open(path, O_WRONLY); | |
1349 | if (fd < 0) | |
1350 | return -errno; | |
1351 | ||
f640cf46 | 1352 | if (lxc_write_nointr(fd, value, strlen(value)) < 0) |
0ad19a3f | 1353 | err = -errno; |
1354 | ||
1355 | close(fd); | |
1356 | return err; | |
1357 | } | |
1358 | ||
0ad19a3f | 1359 | static int neigh_proxy_set(const char *ifname, int family, int flag) |
1360 | { | |
9ba8130c | 1361 | int ret; |
419590da | 1362 | char path[PATH_MAX]; |
0ad19a3f | 1363 | |
1364 | if (family != AF_INET && family != AF_INET6) | |
3cfc0f3a | 1365 | return -EINVAL; |
0ad19a3f | 1366 | |
419590da | 1367 | ret = snprintf(path, PATH_MAX, "/proc/sys/net/%s/conf/%s/%s", |
ebc73a67 CB |
1368 | family == AF_INET ? "ipv4" : "ipv6", ifname, |
1369 | family == AF_INET ? "proxy_arp" : "proxy_ndp"); | |
419590da | 1370 | if (ret < 0 || (size_t)ret >= PATH_MAX) |
9ba8130c | 1371 | return -E2BIG; |
0ad19a3f | 1372 | |
ebc73a67 | 1373 | return proc_sys_net_write(path, flag ? "1" : "0"); |
0ad19a3f | 1374 | } |
1375 | ||
497353b6 | 1376 | int lxc_neigh_proxy_on(const char *name, int family) |
0ad19a3f | 1377 | { |
1378 | return neigh_proxy_set(name, family, 1); | |
1379 | } | |
1380 | ||
497353b6 | 1381 | int lxc_neigh_proxy_off(const char *name, int family) |
0ad19a3f | 1382 | { |
1383 | return neigh_proxy_set(name, family, 0); | |
1384 | } | |
1385 | ||
1386 | int lxc_convert_mac(char *macaddr, struct sockaddr *sockaddr) | |
1387 | { | |
1f1b18e7 DL |
1388 | int i = 0; |
1389 | unsigned val; | |
ebc73a67 CB |
1390 | char c; |
1391 | unsigned char *data; | |
1f1b18e7 DL |
1392 | |
1393 | sockaddr->sa_family = ARPHRD_ETHER; | |
1394 | data = (unsigned char *)sockaddr->sa_data; | |
1395 | ||
1396 | while ((*macaddr != '\0') && (i < ETH_ALEN)) { | |
ebc73a67 CB |
1397 | c = *macaddr++; |
1398 | if (isdigit(c)) | |
1399 | val = c - '0'; | |
1400 | else if (c >= 'a' && c <= 'f') | |
1401 | val = c - 'a' + 10; | |
1402 | else if (c >= 'A' && c <= 'F') | |
1403 | val = c - 'A' + 10; | |
1404 | else | |
1405 | return -EINVAL; | |
1406 | ||
1407 | val <<= 4; | |
1408 | c = *macaddr; | |
1409 | if (isdigit(c)) | |
1410 | val |= c - '0'; | |
1411 | else if (c >= 'a' && c <= 'f') | |
1412 | val |= c - 'a' + 10; | |
1413 | else if (c >= 'A' && c <= 'F') | |
1414 | val |= c - 'A' + 10; | |
1415 | else if (c == ':' || c == 0) | |
1416 | val >>= 4; | |
1417 | else | |
1418 | return -EINVAL; | |
1419 | if (c != 0) | |
1420 | macaddr++; | |
1421 | *data++ = (unsigned char)(val & 0377); | |
1422 | i++; | |
1423 | ||
1424 | if (*macaddr == ':') | |
1425 | macaddr++; | |
0ad19a3f | 1426 | } |
0ad19a3f | 1427 | |
1f1b18e7 | 1428 | return 0; |
0ad19a3f | 1429 | } |
1430 | ||
ebc73a67 CB |
1431 | static int ip_addr_add(int family, int ifindex, void *addr, void *bcast, |
1432 | void *acast, int prefix) | |
0ad19a3f | 1433 | { |
ebc73a67 | 1434 | int addrlen, err; |
06f976ca | 1435 | struct ifaddrmsg *ifa; |
ebc73a67 CB |
1436 | struct nl_handler nlh; |
1437 | struct nlmsg *answer = NULL, *nlmsg = NULL; | |
0ad19a3f | 1438 | |
ebc73a67 CB |
1439 | addrlen = family == AF_INET ? sizeof(struct in_addr) |
1440 | : sizeof(struct in6_addr); | |
4bf1968d | 1441 | |
3cfc0f3a MN |
1442 | err = netlink_open(&nlh, NETLINK_ROUTE); |
1443 | if (err) | |
1444 | return err; | |
0ad19a3f | 1445 | |
3cfc0f3a | 1446 | err = -ENOMEM; |
0ad19a3f | 1447 | nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE); |
1448 | if (!nlmsg) | |
1449 | goto out; | |
1450 | ||
06f976ca | 1451 | answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE); |
0ad19a3f | 1452 | if (!answer) |
1453 | goto out; | |
1454 | ||
06f976ca | 1455 | nlmsg->nlmsghdr->nlmsg_flags = |
ebc73a67 | 1456 | NLM_F_ACK | NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL; |
06f976ca SZ |
1457 | nlmsg->nlmsghdr->nlmsg_type = RTM_NEWADDR; |
1458 | ||
1459 | ifa = nlmsg_reserve(nlmsg, sizeof(struct ifaddrmsg)); | |
acf47e1b | 1460 | if (!ifa) |
25a9939b | 1461 | goto out; |
06f976ca SZ |
1462 | ifa->ifa_prefixlen = prefix; |
1463 | ifa->ifa_index = ifindex; | |
1464 | ifa->ifa_family = family; | |
1465 | ifa->ifa_scope = 0; | |
acf47e1b | 1466 | |
3cfc0f3a | 1467 | err = -EINVAL; |
4bf1968d | 1468 | if (nla_put_buffer(nlmsg, IFA_LOCAL, addr, addrlen)) |
0ad19a3f | 1469 | goto out; |
1470 | ||
4bf1968d | 1471 | if (nla_put_buffer(nlmsg, IFA_ADDRESS, addr, addrlen)) |
0ad19a3f | 1472 | goto out; |
1473 | ||
d8948a52 | 1474 | if (nla_put_buffer(nlmsg, IFA_BROADCAST, bcast, addrlen)) |
1f1b18e7 DL |
1475 | goto out; |
1476 | ||
ebc73a67 | 1477 | /* TODO: multicast, anycast with ipv6 */ |
7ddc8f24 | 1478 | err = -EPROTONOSUPPORT; |
79881dc6 DL |
1479 | if (family == AF_INET6 && |
1480 | (memcmp(bcast, &in6addr_any, sizeof(in6addr_any)) || | |
1481 | memcmp(acast, &in6addr_any, sizeof(in6addr_any)))) | |
1f1b18e7 | 1482 | goto out; |
0ad19a3f | 1483 | |
3cfc0f3a | 1484 | err = netlink_transaction(&nlh, nlmsg, answer); |
0ad19a3f | 1485 | out: |
1486 | netlink_close(&nlh); | |
1487 | nlmsg_free(answer); | |
1488 | nlmsg_free(nlmsg); | |
1489 | return err; | |
1490 | } | |
1491 | ||
1f1b18e7 | 1492 | int lxc_ipv6_addr_add(int ifindex, struct in6_addr *addr, |
ebc73a67 CB |
1493 | struct in6_addr *mcast, struct in6_addr *acast, |
1494 | int prefix) | |
1f1b18e7 DL |
1495 | { |
1496 | return ip_addr_add(AF_INET6, ifindex, addr, mcast, acast, prefix); | |
1497 | } | |
1498 | ||
ebc73a67 CB |
1499 | int lxc_ipv4_addr_add(int ifindex, struct in_addr *addr, struct in_addr *bcast, |
1500 | int prefix) | |
1f1b18e7 DL |
1501 | { |
1502 | return ip_addr_add(AF_INET, ifindex, addr, bcast, NULL, prefix); | |
1503 | } | |
1504 | ||
ebc73a67 CB |
1505 | /* Find an IFA_LOCAL (or IFA_ADDRESS if not IFA_LOCAL is present) address from |
1506 | * the given RTM_NEWADDR message. Allocates memory for the address and stores | |
1507 | * that pointer in *res (so res should be an in_addr** or in6_addr**). | |
19a26f82 | 1508 | */ |
6ce39620 CB |
1509 | #pragma GCC diagnostic push |
1510 | #pragma GCC diagnostic ignored "-Wcast-align" | |
1511 | ||
ebc73a67 CB |
1512 | static int ifa_get_local_ip(int family, struct nlmsghdr *msg, void **res) |
1513 | { | |
1514 | int addrlen; | |
06f976ca SZ |
1515 | struct ifaddrmsg *ifa = NLMSG_DATA(msg); |
1516 | struct rtattr *rta = IFA_RTA(ifa); | |
1517 | int attr_len = NLMSG_PAYLOAD(msg, sizeof(struct ifaddrmsg)); | |
19a26f82 | 1518 | |
06f976ca | 1519 | if (ifa->ifa_family != family) |
19a26f82 MK |
1520 | return 0; |
1521 | ||
ebc73a67 CB |
1522 | addrlen = family == AF_INET ? sizeof(struct in_addr) |
1523 | : sizeof(struct in6_addr); | |
19a26f82 MK |
1524 | |
1525 | /* Loop over the rtattr's in this message */ | |
ebc73a67 | 1526 | while (RTA_OK(rta, attr_len)) { |
19a26f82 | 1527 | /* Found a local address for the requested interface, |
ebc73a67 CB |
1528 | * return it. |
1529 | */ | |
1530 | if (rta->rta_type == IFA_LOCAL || | |
1531 | rta->rta_type == IFA_ADDRESS) { | |
1532 | /* Sanity check. The family check above should make sure | |
1533 | * the address length is correct, but check here just in | |
1534 | * case. | |
1535 | */ | |
19a26f82 MK |
1536 | if (RTA_PAYLOAD(rta) != addrlen) |
1537 | return -1; | |
1538 | ||
ebc73a67 CB |
1539 | /* We might have found an IFA_ADDRESS before, which we |
1540 | * now overwrite with an IFA_LOCAL. | |
1541 | */ | |
dd66e5ad | 1542 | if (!*res) { |
19a26f82 | 1543 | *res = malloc(addrlen); |
dd66e5ad DE |
1544 | if (!*res) |
1545 | return -1; | |
1546 | } | |
19a26f82 MK |
1547 | |
1548 | memcpy(*res, RTA_DATA(rta), addrlen); | |
19a26f82 MK |
1549 | if (rta->rta_type == IFA_LOCAL) |
1550 | break; | |
1551 | } | |
1552 | rta = RTA_NEXT(rta, attr_len); | |
1553 | } | |
1554 | return 0; | |
1555 | } | |
1556 | ||
6ce39620 CB |
1557 | #pragma GCC diagnostic pop |
1558 | ||
19a26f82 MK |
1559 | static int ip_addr_get(int family, int ifindex, void **res) |
1560 | { | |
ebc73a67 | 1561 | int answer_len, err; |
06f976ca | 1562 | struct ifaddrmsg *ifa; |
ebc73a67 | 1563 | struct nl_handler nlh; |
19a26f82 | 1564 | struct nlmsghdr *msg; |
ebc73a67 CB |
1565 | int readmore = 0, recv_len = 0; |
1566 | struct nlmsg *answer = NULL, *nlmsg = NULL; | |
19a26f82 MK |
1567 | |
1568 | err = netlink_open(&nlh, NETLINK_ROUTE); | |
1569 | if (err) | |
1570 | return err; | |
1571 | ||
1572 | err = -ENOMEM; | |
1573 | nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE); | |
1574 | if (!nlmsg) | |
1575 | goto out; | |
1576 | ||
06f976ca | 1577 | answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE); |
19a26f82 MK |
1578 | if (!answer) |
1579 | goto out; | |
1580 | ||
ebc73a67 CB |
1581 | /* Save the answer buffer length, since it will be overwritten on the |
1582 | * first receive (and we might need to receive more than once). | |
1583 | */ | |
06f976ca SZ |
1584 | answer_len = answer->nlmsghdr->nlmsg_len; |
1585 | ||
ebc73a67 | 1586 | nlmsg->nlmsghdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT; |
06f976ca | 1587 | nlmsg->nlmsghdr->nlmsg_type = RTM_GETADDR; |
19a26f82 | 1588 | |
06f976ca | 1589 | ifa = nlmsg_reserve(nlmsg, sizeof(struct ifaddrmsg)); |
25a9939b WC |
1590 | if (!ifa) |
1591 | goto out; | |
06f976ca | 1592 | ifa->ifa_family = family; |
19a26f82 | 1593 | |
ebc73a67 CB |
1594 | /* Send the request for addresses, which returns all addresses on all |
1595 | * interfaces. | |
1596 | */ | |
19a26f82 MK |
1597 | err = netlink_send(&nlh, nlmsg); |
1598 | if (err < 0) | |
1599 | goto out; | |
19a26f82 | 1600 | |
6ce39620 CB |
1601 | #pragma GCC diagnostic push |
1602 | #pragma GCC diagnostic ignored "-Wcast-align" | |
1603 | ||
19a26f82 MK |
1604 | do { |
1605 | /* Restore the answer buffer length, it might have been | |
ebc73a67 CB |
1606 | * overwritten by a previous receive. |
1607 | */ | |
06f976ca | 1608 | answer->nlmsghdr->nlmsg_len = answer_len; |
19a26f82 | 1609 | |
ebc73a67 | 1610 | /* Get the (next) batch of reply messages. */ |
19a26f82 MK |
1611 | err = netlink_rcv(&nlh, answer); |
1612 | if (err < 0) | |
1613 | goto out; | |
1614 | ||
1615 | recv_len = err; | |
1616 | err = 0; | |
1617 | ||
ebc73a67 | 1618 | /* Satisfy the typing for the netlink macros. */ |
06f976ca | 1619 | msg = answer->nlmsghdr; |
19a26f82 MK |
1620 | |
1621 | while (NLMSG_OK(msg, recv_len)) { | |
ebc73a67 | 1622 | /* Stop reading if we see an error message. */ |
19a26f82 | 1623 | if (msg->nlmsg_type == NLMSG_ERROR) { |
ebc73a67 CB |
1624 | struct nlmsgerr *errmsg = |
1625 | (struct nlmsgerr *)NLMSG_DATA(msg); | |
19a26f82 MK |
1626 | err = errmsg->error; |
1627 | goto out; | |
1628 | } | |
1629 | ||
ebc73a67 | 1630 | /* Stop reading if we see a NLMSG_DONE message. */ |
19a26f82 MK |
1631 | if (msg->nlmsg_type == NLMSG_DONE) { |
1632 | readmore = 0; | |
1633 | break; | |
1634 | } | |
1635 | ||
1636 | if (msg->nlmsg_type != RTM_NEWADDR) { | |
1637 | err = -1; | |
1638 | goto out; | |
1639 | } | |
1640 | ||
06f976ca SZ |
1641 | ifa = (struct ifaddrmsg *)NLMSG_DATA(msg); |
1642 | if (ifa->ifa_index == ifindex) { | |
1643 | if (ifa_get_local_ip(family, msg, res) < 0) { | |
51e7a874 SG |
1644 | err = -1; |
1645 | goto out; | |
1646 | } | |
1647 | ||
ebc73a67 | 1648 | /* Found a result, stop searching. */ |
19a26f82 MK |
1649 | if (*res) |
1650 | goto out; | |
1651 | } | |
1652 | ||
ebc73a67 CB |
1653 | /* Keep reading more data from the socket if the last |
1654 | * message had the NLF_F_MULTI flag set. | |
1655 | */ | |
19a26f82 MK |
1656 | readmore = (msg->nlmsg_flags & NLM_F_MULTI); |
1657 | ||
ebc73a67 | 1658 | /* Look at the next message received in this buffer. */ |
19a26f82 MK |
1659 | msg = NLMSG_NEXT(msg, recv_len); |
1660 | } | |
1661 | } while (readmore); | |
1662 | ||
6ce39620 CB |
1663 | #pragma GCC diagnostic pop |
1664 | ||
19a26f82 | 1665 | /* If we end up here, we didn't find any result, so signal an |
ebc73a67 CB |
1666 | * error. |
1667 | */ | |
19a26f82 MK |
1668 | err = -1; |
1669 | ||
1670 | out: | |
1671 | netlink_close(&nlh); | |
1672 | nlmsg_free(answer); | |
1673 | nlmsg_free(nlmsg); | |
1674 | return err; | |
1675 | } | |
1676 | ||
1677 | int lxc_ipv6_addr_get(int ifindex, struct in6_addr **res) | |
1678 | { | |
ebc73a67 | 1679 | return ip_addr_get(AF_INET6, ifindex, (void **)res); |
19a26f82 MK |
1680 | } |
1681 | ||
ebc73a67 | 1682 | int lxc_ipv4_addr_get(int ifindex, struct in_addr **res) |
19a26f82 | 1683 | { |
ebc73a67 | 1684 | return ip_addr_get(AF_INET, ifindex, (void **)res); |
19a26f82 MK |
1685 | } |
1686 | ||
f8fee0e2 MK |
1687 | static int ip_gateway_add(int family, int ifindex, void *gw) |
1688 | { | |
ebc73a67 | 1689 | int addrlen, err; |
f8fee0e2 | 1690 | struct nl_handler nlh; |
06f976ca | 1691 | struct rtmsg *rt; |
ebc73a67 | 1692 | struct nlmsg *answer = NULL, *nlmsg = NULL; |
f8fee0e2 | 1693 | |
ebc73a67 CB |
1694 | addrlen = family == AF_INET ? sizeof(struct in_addr) |
1695 | : sizeof(struct in6_addr); | |
f8fee0e2 MK |
1696 | |
1697 | err = netlink_open(&nlh, NETLINK_ROUTE); | |
1698 | if (err) | |
1699 | return err; | |
1700 | ||
1701 | err = -ENOMEM; | |
1702 | nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE); | |
1703 | if (!nlmsg) | |
1704 | goto out; | |
1705 | ||
06f976ca | 1706 | answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE); |
f8fee0e2 MK |
1707 | if (!answer) |
1708 | goto out; | |
1709 | ||
06f976ca | 1710 | nlmsg->nlmsghdr->nlmsg_flags = |
ebc73a67 | 1711 | NLM_F_ACK | NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL; |
06f976ca SZ |
1712 | nlmsg->nlmsghdr->nlmsg_type = RTM_NEWROUTE; |
1713 | ||
1714 | rt = nlmsg_reserve(nlmsg, sizeof(struct rtmsg)); | |
25a9939b WC |
1715 | if (!rt) |
1716 | goto out; | |
06f976ca SZ |
1717 | rt->rtm_family = family; |
1718 | rt->rtm_table = RT_TABLE_MAIN; | |
1719 | rt->rtm_scope = RT_SCOPE_UNIVERSE; | |
1720 | rt->rtm_protocol = RTPROT_BOOT; | |
1721 | rt->rtm_type = RTN_UNICAST; | |
f8fee0e2 | 1722 | /* "default" destination */ |
06f976ca | 1723 | rt->rtm_dst_len = 0; |
f8fee0e2 MK |
1724 | |
1725 | err = -EINVAL; | |
1726 | if (nla_put_buffer(nlmsg, RTA_GATEWAY, gw, addrlen)) | |
1727 | goto out; | |
1728 | ||
1729 | /* Adding the interface index enables the use of link-local | |
ebc73a67 CB |
1730 | * addresses for the gateway. |
1731 | */ | |
f8fee0e2 MK |
1732 | if (nla_put_u32(nlmsg, RTA_OIF, ifindex)) |
1733 | goto out; | |
1734 | ||
1735 | err = netlink_transaction(&nlh, nlmsg, answer); | |
1736 | out: | |
1737 | netlink_close(&nlh); | |
1738 | nlmsg_free(answer); | |
1739 | nlmsg_free(nlmsg); | |
1740 | return err; | |
1741 | } | |
1742 | ||
1743 | int lxc_ipv4_gateway_add(int ifindex, struct in_addr *gw) | |
1744 | { | |
1745 | return ip_gateway_add(AF_INET, ifindex, gw); | |
1746 | } | |
1747 | ||
1748 | int lxc_ipv6_gateway_add(int ifindex, struct in6_addr *gw) | |
1749 | { | |
1750 | return ip_gateway_add(AF_INET6, ifindex, gw); | |
1751 | } | |
1752 | ||
77dcf03a GL |
1753 | static int ip_route_dest_add(int family, int ifindex, void *dest) |
1754 | { | |
ebc73a67 | 1755 | int addrlen, err; |
77dcf03a | 1756 | struct nl_handler nlh; |
06f976ca | 1757 | struct rtmsg *rt; |
ebc73a67 | 1758 | struct nlmsg *answer = NULL, *nlmsg = NULL; |
acf47e1b | 1759 | |
ebc73a67 CB |
1760 | addrlen = family == AF_INET ? sizeof(struct in_addr) |
1761 | : sizeof(struct in6_addr); | |
acf47e1b | 1762 | |
77dcf03a GL |
1763 | err = netlink_open(&nlh, NETLINK_ROUTE); |
1764 | if (err) | |
1765 | return err; | |
acf47e1b | 1766 | |
77dcf03a GL |
1767 | err = -ENOMEM; |
1768 | nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE); | |
1769 | if (!nlmsg) | |
1770 | goto out; | |
acf47e1b | 1771 | |
06f976ca | 1772 | answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE); |
77dcf03a GL |
1773 | if (!answer) |
1774 | goto out; | |
acf47e1b | 1775 | |
06f976ca | 1776 | nlmsg->nlmsghdr->nlmsg_flags = |
ebc73a67 | 1777 | NLM_F_ACK | NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL; |
06f976ca SZ |
1778 | nlmsg->nlmsghdr->nlmsg_type = RTM_NEWROUTE; |
1779 | ||
1780 | rt = nlmsg_reserve(nlmsg, sizeof(struct rtmsg)); | |
25a9939b WC |
1781 | if (!rt) |
1782 | goto out; | |
06f976ca SZ |
1783 | rt->rtm_family = family; |
1784 | rt->rtm_table = RT_TABLE_MAIN; | |
1785 | rt->rtm_scope = RT_SCOPE_LINK; | |
1786 | rt->rtm_protocol = RTPROT_BOOT; | |
1787 | rt->rtm_type = RTN_UNICAST; | |
ebc73a67 | 1788 | rt->rtm_dst_len = addrlen * 8; |
acf47e1b | 1789 | |
77dcf03a GL |
1790 | err = -EINVAL; |
1791 | if (nla_put_buffer(nlmsg, RTA_DST, dest, addrlen)) | |
1792 | goto out; | |
1793 | if (nla_put_u32(nlmsg, RTA_OIF, ifindex)) | |
1794 | goto out; | |
1795 | err = netlink_transaction(&nlh, nlmsg, answer); | |
1796 | out: | |
1797 | netlink_close(&nlh); | |
1798 | nlmsg_free(answer); | |
1799 | nlmsg_free(nlmsg); | |
1800 | return err; | |
1801 | } | |
1802 | ||
1803 | int lxc_ipv4_dest_add(int ifindex, struct in_addr *dest) | |
1804 | { | |
1805 | return ip_route_dest_add(AF_INET, ifindex, dest); | |
1806 | } | |
1807 | ||
1808 | int lxc_ipv6_dest_add(int ifindex, struct in6_addr *dest) | |
1809 | { | |
1810 | return ip_route_dest_add(AF_INET6, ifindex, dest); | |
1811 | } | |
1812 | ||
581c75e7 | 1813 | bool is_ovs_bridge(const char *bridge) |
0d204771 | 1814 | { |
ebc73a67 | 1815 | int ret; |
0d204771 | 1816 | struct stat sb; |
ebc73a67 | 1817 | char brdirname[22 + IFNAMSIZ + 1] = {0}; |
0d204771 | 1818 | |
ebc73a67 CB |
1819 | ret = snprintf(brdirname, 22 + IFNAMSIZ + 1, "/sys/class/net/%s/bridge", |
1820 | bridge); | |
1821 | if (ret < 0 || (size_t)ret >= 22 + IFNAMSIZ + 1) | |
1822 | return false; | |
1823 | ||
1824 | ret = stat(brdirname, &sb); | |
1825 | if (ret < 0 && errno == ENOENT) | |
0d204771 | 1826 | return true; |
ebc73a67 | 1827 | |
0d204771 SH |
1828 | return false; |
1829 | } | |
1830 | ||
581c75e7 CB |
1831 | struct ovs_veth_args { |
1832 | const char *bridge; | |
1833 | const char *nic; | |
1834 | }; | |
1835 | ||
cb0dc11b CB |
1836 | /* Called from a background thread - when nic goes away, remove it from the |
1837 | * bridge. | |
c43cbc04 | 1838 | */ |
581c75e7 | 1839 | static int lxc_ovs_delete_port_exec(void *data) |
c43cbc04 | 1840 | { |
581c75e7 | 1841 | struct ovs_veth_args *args = data; |
cb0dc11b | 1842 | |
581c75e7 CB |
1843 | execlp("ovs-vsctl", "ovs-vsctl", "del-port", args->bridge, args->nic, |
1844 | (char *)NULL); | |
1845 | return -1; | |
c43cbc04 SH |
1846 | } |
1847 | ||
581c75e7 | 1848 | int lxc_ovs_delete_port(const char *bridge, const char *nic) |
0d204771 | 1849 | { |
c43cbc04 | 1850 | int ret; |
419590da | 1851 | char cmd_output[PATH_MAX]; |
581c75e7 | 1852 | struct ovs_veth_args args; |
6ad22d06 | 1853 | |
581c75e7 CB |
1854 | args.bridge = bridge; |
1855 | args.nic = nic; | |
1856 | ret = run_command(cmd_output, sizeof(cmd_output), | |
1857 | lxc_ovs_delete_port_exec, (void *)&args); | |
1858 | if (ret < 0) { | |
1859 | ERROR("Failed to delete \"%s\" from openvswitch bridge \"%s\": " | |
1860 | "%s", bridge, nic, cmd_output); | |
6ad22d06 | 1861 | return -1; |
581c75e7 | 1862 | } |
0d204771 | 1863 | |
581c75e7 CB |
1864 | return 0; |
1865 | } | |
ebc73a67 | 1866 | |
581c75e7 CB |
1867 | static int lxc_ovs_attach_bridge_exec(void *data) |
1868 | { | |
1869 | struct ovs_veth_args *args = data; | |
ebc73a67 | 1870 | |
581c75e7 CB |
1871 | execlp("ovs-vsctl", "ovs-vsctl", "add-port", args->bridge, args->nic, |
1872 | (char *)NULL); | |
1873 | return -1; | |
1874 | } | |
ebc73a67 | 1875 | |
581c75e7 CB |
1876 | static int lxc_ovs_attach_bridge(const char *bridge, const char *nic) |
1877 | { | |
1878 | int ret; | |
419590da | 1879 | char cmd_output[PATH_MAX]; |
581c75e7 | 1880 | struct ovs_veth_args args; |
ebc73a67 | 1881 | |
581c75e7 CB |
1882 | args.bridge = bridge; |
1883 | args.nic = nic; | |
1884 | ret = run_command(cmd_output, sizeof(cmd_output), | |
1885 | lxc_ovs_attach_bridge_exec, (void *)&args); | |
1886 | if (ret < 0) { | |
1887 | ERROR("Failed to attach \"%s\" to openvswitch bridge \"%s\": %s", | |
1888 | bridge, nic, cmd_output); | |
1889 | return -1; | |
c43cbc04 | 1890 | } |
0d204771 | 1891 | |
581c75e7 | 1892 | return 0; |
0d204771 | 1893 | } |
0d204771 | 1894 | |
581c75e7 | 1895 | int lxc_bridge_attach(const char *bridge, const char *ifname) |
0ad19a3f | 1896 | { |
ebc73a67 | 1897 | int err, fd, index; |
9de31d5a | 1898 | size_t retlen; |
0ad19a3f | 1899 | struct ifreq ifr; |
1900 | ||
dae3fdf6 | 1901 | if (strlen(ifname) >= IFNAMSIZ) |
3cfc0f3a | 1902 | return -EINVAL; |
0ad19a3f | 1903 | |
1904 | index = if_nametoindex(ifname); | |
1905 | if (!index) | |
3cfc0f3a | 1906 | return -EINVAL; |
0ad19a3f | 1907 | |
0d204771 | 1908 | if (is_ovs_bridge(bridge)) |
581c75e7 | 1909 | return lxc_ovs_attach_bridge(bridge, ifname); |
0d204771 | 1910 | |
0ad19a3f | 1911 | fd = socket(AF_INET, SOCK_STREAM, 0); |
1912 | if (fd < 0) | |
3cfc0f3a | 1913 | return -errno; |
0ad19a3f | 1914 | |
9de31d5a | 1915 | retlen = strlcpy(ifr.ifr_name, bridge, IFNAMSIZ); |
42cc4083 CB |
1916 | if (retlen >= IFNAMSIZ) { |
1917 | close(fd); | |
9de31d5a | 1918 | return -E2BIG; |
42cc4083 | 1919 | } |
9de31d5a | 1920 | |
ebc73a67 | 1921 | ifr.ifr_name[IFNAMSIZ - 1] = '\0'; |
0ad19a3f | 1922 | ifr.ifr_ifindex = index; |
7d163508 | 1923 | err = ioctl(fd, SIOCBRADDIF, &ifr); |
0ad19a3f | 1924 | close(fd); |
3cfc0f3a MN |
1925 | if (err) |
1926 | err = -errno; | |
0ad19a3f | 1927 | |
1928 | return err; | |
1929 | } | |
72d0e1cb | 1930 | |
ebc73a67 | 1931 | static const char *const lxc_network_types[LXC_NET_MAXCONFTYPE + 1] = { |
b343592b | 1932 | [LXC_NET_EMPTY] = "empty", |
72d0e1cb SG |
1933 | [LXC_NET_VETH] = "veth", |
1934 | [LXC_NET_MACVLAN] = "macvlan", | |
72d0e1cb | 1935 | [LXC_NET_PHYS] = "phys", |
b343592b BP |
1936 | [LXC_NET_VLAN] = "vlan", |
1937 | [LXC_NET_NONE] = "none", | |
72d0e1cb SG |
1938 | }; |
1939 | ||
1940 | const char *lxc_net_type_to_str(int type) | |
1941 | { | |
1942 | if (type < 0 || type > LXC_NET_MAXCONFTYPE) | |
1943 | return NULL; | |
ebc73a67 | 1944 | |
72d0e1cb SG |
1945 | return lxc_network_types[type]; |
1946 | } | |
8befa924 | 1947 | |
ebc73a67 | 1948 | static const char padchar[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
a0265685 | 1949 | |
966e9f1f | 1950 | char *lxc_mkifname(char *template) |
a0265685 | 1951 | { |
2d7bf744 | 1952 | int ret; |
b1e44ed1 | 1953 | struct netns_ifaddrs *ifa, *ifaddr; |
966e9f1f CB |
1954 | char name[IFNAMSIZ]; |
1955 | bool exists = false; | |
1956 | size_t i = 0; | |
280cc35f | 1957 | #ifdef HAVE_RAND_R |
1958 | unsigned int seed; | |
1959 | ||
1960 | seed = randseed(false); | |
1961 | #else | |
1962 | ||
1963 | (void)randseed(true); | |
1964 | #endif | |
a0265685 | 1965 | |
535e8859 CB |
1966 | if (strlen(template) >= IFNAMSIZ) |
1967 | return NULL; | |
1968 | ||
ebc73a67 | 1969 | /* Get all the network interfaces. */ |
b1e44ed1 | 1970 | ret = netns_getifaddrs(&ifaddr, -1, &(bool){false}); |
2d7bf744 | 1971 | if (ret < 0) { |
6d1400b5 | 1972 | SYSERROR("Failed to get network interfaces"); |
2d7bf744 CB |
1973 | return NULL; |
1974 | } | |
a0265685 | 1975 | |
ebc73a67 | 1976 | /* Generate random names until we find one that doesn't exist. */ |
51a8a74c | 1977 | for (;;) { |
966e9f1f | 1978 | name[0] = '\0'; |
94b1cade | 1979 | (void)strlcpy(name, template, IFNAMSIZ); |
a0265685 | 1980 | |
966e9f1f | 1981 | exists = false; |
280cc35f | 1982 | |
a0265685 SG |
1983 | for (i = 0; i < strlen(name); i++) { |
1984 | if (name[i] == 'X') { | |
1985 | #ifdef HAVE_RAND_R | |
8523344a | 1986 | name[i] = padchar[rand_r(&seed) % strlen(padchar)]; |
a0265685 | 1987 | #else |
8523344a | 1988 | name[i] = padchar[rand() % strlen(padchar)]; |
a0265685 SG |
1989 | #endif |
1990 | } | |
1991 | } | |
1992 | ||
1993 | for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) { | |
966e9f1f CB |
1994 | if (!strcmp(ifa->ifa_name, name)) { |
1995 | exists = true; | |
a0265685 SG |
1996 | break; |
1997 | } | |
1998 | } | |
1999 | ||
966e9f1f | 2000 | if (!exists) |
a0265685 | 2001 | break; |
a0265685 SG |
2002 | } |
2003 | ||
b1e44ed1 | 2004 | netns_freeifaddrs(ifaddr); |
94b1cade DJ |
2005 | (void)strlcpy(template, name, strlen(template) + 1); |
2006 | ||
2007 | return template; | |
a0265685 SG |
2008 | } |
2009 | ||
8befa924 SH |
2010 | int setup_private_host_hw_addr(char *veth1) |
2011 | { | |
ebc73a67 | 2012 | int err, sockfd; |
8befa924 | 2013 | struct ifreq ifr; |
8befa924 | 2014 | |
8befa924 | 2015 | sockfd = socket(AF_INET, SOCK_DGRAM, 0); |
8befa924 SH |
2016 | if (sockfd < 0) |
2017 | return -errno; | |
2018 | ||
ebc73a67 | 2019 | err = snprintf((char *)ifr.ifr_name, IFNAMSIZ, "%s", veth1); |
87c6e5db DJ |
2020 | if (err < 0 || (size_t)err >= IFNAMSIZ) { |
2021 | close(sockfd); | |
ebc73a67 | 2022 | return -E2BIG; |
87c6e5db | 2023 | } |
ebc73a67 | 2024 | |
8befa924 SH |
2025 | err = ioctl(sockfd, SIOCGIFHWADDR, &ifr); |
2026 | if (err < 0) { | |
8befa924 | 2027 | close(sockfd); |
8befa924 SH |
2028 | return -errno; |
2029 | } | |
2030 | ||
2031 | ifr.ifr_hwaddr.sa_data[0] = 0xfe; | |
2032 | err = ioctl(sockfd, SIOCSIFHWADDR, &ifr); | |
8befa924 | 2033 | close(sockfd); |
8befa924 SH |
2034 | if (err < 0) |
2035 | return -errno; | |
2036 | ||
2037 | return 0; | |
2038 | } | |
811ef482 CB |
2039 | |
2040 | int lxc_find_gateway_addresses(struct lxc_handler *handler) | |
2041 | { | |
2042 | struct lxc_list *network = &handler->conf->network; | |
2043 | struct lxc_list *iterator; | |
2044 | struct lxc_netdev *netdev; | |
2045 | int link_index; | |
2046 | ||
2047 | lxc_list_for_each(iterator, network) { | |
2048 | netdev = iterator->elem; | |
2049 | ||
2050 | if (!netdev->ipv4_gateway_auto && !netdev->ipv6_gateway_auto) | |
2051 | continue; | |
2052 | ||
2053 | if (netdev->type != LXC_NET_VETH && netdev->type != LXC_NET_MACVLAN) { | |
2054 | ERROR("Automatic gateway detection is only supported " | |
2055 | "for veth and macvlan"); | |
2056 | return -1; | |
2057 | } | |
2058 | ||
de4855a8 | 2059 | if (netdev->link[0] == '\0') { |
811ef482 CB |
2060 | ERROR("Automatic gateway detection needs a link interface"); |
2061 | return -1; | |
2062 | } | |
2063 | ||
2064 | link_index = if_nametoindex(netdev->link); | |
2065 | if (!link_index) | |
2066 | return -EINVAL; | |
2067 | ||
2068 | if (netdev->ipv4_gateway_auto) { | |
2069 | if (lxc_ipv4_addr_get(link_index, &netdev->ipv4_gateway)) { | |
2070 | ERROR("Failed to automatically find ipv4 gateway " | |
2071 | "address from link interface \"%s\"", netdev->link); | |
2072 | return -1; | |
2073 | } | |
2074 | } | |
2075 | ||
2076 | if (netdev->ipv6_gateway_auto) { | |
2077 | if (lxc_ipv6_addr_get(link_index, &netdev->ipv6_gateway)) { | |
2078 | ERROR("Failed to automatically find ipv6 gateway " | |
2079 | "address from link interface \"%s\"", netdev->link); | |
2080 | return -1; | |
2081 | } | |
2082 | } | |
2083 | } | |
2084 | ||
2085 | return 0; | |
2086 | } | |
2087 | ||
2088 | #define LXC_USERNIC_PATH LIBEXECDIR "/lxc/lxc-user-nic" | |
f0ecc19d | 2089 | static int lxc_create_network_unpriv_exec(const char *lxcpath, const char *lxcname, |
4d781681 | 2090 | struct lxc_netdev *netdev, pid_t pid, unsigned int hooks_version) |
811ef482 CB |
2091 | { |
2092 | int ret; | |
2093 | pid_t child; | |
2094 | int bytes, pipefd[2]; | |
2095 | char *token, *saveptr = NULL; | |
095ead80 | 2096 | char netdev_link[IFNAMSIZ]; |
419590da | 2097 | char buffer[PATH_MAX] = {0}; |
94b1cade | 2098 | size_t retlen; |
811ef482 CB |
2099 | |
2100 | if (netdev->type != LXC_NET_VETH) { | |
2101 | ERROR("Network type %d not support for unprivileged use", netdev->type); | |
2102 | return -1; | |
2103 | } | |
2104 | ||
2105 | ret = pipe(pipefd); | |
2106 | if (ret < 0) { | |
2107 | SYSERROR("Failed to create pipe"); | |
2108 | return -1; | |
2109 | } | |
2110 | ||
2111 | child = fork(); | |
2112 | if (child < 0) { | |
2113 | SYSERROR("Failed to create new process"); | |
2114 | close(pipefd[0]); | |
2115 | close(pipefd[1]); | |
2116 | return -1; | |
2117 | } | |
2118 | ||
2119 | if (child == 0) { | |
8335fd40 | 2120 | char pidstr[INTTYPE_TO_STRLEN(pid_t)]; |
811ef482 CB |
2121 | |
2122 | close(pipefd[0]); | |
2123 | ||
2124 | ret = dup2(pipefd[1], STDOUT_FILENO); | |
2125 | if (ret >= 0) | |
2126 | ret = dup2(pipefd[1], STDERR_FILENO); | |
2127 | close(pipefd[1]); | |
2128 | if (ret < 0) { | |
2129 | SYSERROR("Failed to duplicate std{err,out} file descriptor"); | |
78070056 | 2130 | _exit(EXIT_FAILURE); |
811ef482 CB |
2131 | } |
2132 | ||
de4855a8 | 2133 | if (netdev->link[0] != '\0') |
9de31d5a | 2134 | retlen = strlcpy(netdev_link, netdev->link, IFNAMSIZ); |
811ef482 | 2135 | else |
9de31d5a CB |
2136 | retlen = strlcpy(netdev_link, "none", IFNAMSIZ); |
2137 | if (retlen >= IFNAMSIZ) { | |
2138 | SYSERROR("Invalid network device name"); | |
2139 | _exit(EXIT_FAILURE); | |
2140 | } | |
811ef482 | 2141 | |
8335fd40 CB |
2142 | ret = snprintf(pidstr, sizeof(pidstr), "%d", pid); |
2143 | if (ret < 0 || ret >= sizeof(pidstr)) | |
78070056 | 2144 | _exit(EXIT_FAILURE); |
8335fd40 | 2145 | pidstr[sizeof(pidstr) - 1] = '\0'; |
811ef482 CB |
2146 | |
2147 | INFO("Execing lxc-user-nic create %s %s %s veth %s %s", lxcpath, | |
2148 | lxcname, pidstr, netdev_link, | |
de4855a8 CB |
2149 | netdev->name[0] != '\0' ? netdev->name : "(null)"); |
2150 | if (netdev->name[0] != '\0') | |
811ef482 CB |
2151 | execlp(LXC_USERNIC_PATH, LXC_USERNIC_PATH, "create", |
2152 | lxcpath, lxcname, pidstr, "veth", netdev_link, | |
2153 | netdev->name, (char *)NULL); | |
2154 | else | |
2155 | execlp(LXC_USERNIC_PATH, LXC_USERNIC_PATH, "create", | |
2156 | lxcpath, lxcname, pidstr, "veth", netdev_link, | |
2157 | (char *)NULL); | |
2158 | SYSERROR("Failed to execute lxc-user-nic"); | |
78070056 | 2159 | _exit(EXIT_FAILURE); |
811ef482 CB |
2160 | } |
2161 | ||
2162 | /* close the write-end of the pipe */ | |
2163 | close(pipefd[1]); | |
2164 | ||
419590da | 2165 | bytes = lxc_read_nointr(pipefd[0], &buffer, PATH_MAX); |
811ef482 | 2166 | if (bytes < 0) { |
74c6e2b0 | 2167 | SYSERROR("Failed to read from pipe file descriptor"); |
811ef482 | 2168 | close(pipefd[0]); |
6b9f82a9 CB |
2169 | } else { |
2170 | buffer[bytes - 1] = '\0'; | |
811ef482 | 2171 | } |
811ef482 CB |
2172 | |
2173 | ret = wait_for_pid(child); | |
2174 | close(pipefd[0]); | |
6b9f82a9 | 2175 | if (ret != 0 || bytes < 0) { |
811ef482 CB |
2176 | ERROR("lxc-user-nic failed to configure requested network: %s", |
2177 | buffer[0] != '\0' ? buffer : "(null)"); | |
2178 | return -1; | |
2179 | } | |
2180 | TRACE("Received output \"%s\" from lxc-user-nic", buffer); | |
2181 | ||
2182 | /* netdev->name */ | |
2183 | token = strtok_r(buffer, ":", &saveptr); | |
74c6e2b0 CB |
2184 | if (!token) { |
2185 | ERROR("Failed to parse lxc-user-nic output"); | |
811ef482 | 2186 | return -1; |
74c6e2b0 | 2187 | } |
811ef482 | 2188 | |
def4def6 CB |
2189 | memset(netdev->name, 0, IFNAMSIZ); |
2190 | memcpy(netdev->name, token, IFNAMSIZ - 1); | |
811ef482 | 2191 | |
74c6e2b0 | 2192 | /* netdev->ifindex */ |
811ef482 | 2193 | token = strtok_r(NULL, ":", &saveptr); |
74c6e2b0 CB |
2194 | if (!token) { |
2195 | ERROR("Failed to parse lxc-user-nic output"); | |
811ef482 | 2196 | return -1; |
74c6e2b0 | 2197 | } |
811ef482 | 2198 | |
74c6e2b0 CB |
2199 | ret = lxc_safe_int(token, &netdev->ifindex); |
2200 | if (ret < 0) { | |
6d1400b5 | 2201 | errno = -ret; |
2202 | SYSERROR("Failed to convert string \"%s\" to integer", token); | |
811ef482 CB |
2203 | return -1; |
2204 | } | |
2205 | ||
74c6e2b0 | 2206 | /* netdev->priv.veth_attr.veth1 */ |
811ef482 | 2207 | token = strtok_r(NULL, ":", &saveptr); |
74c6e2b0 CB |
2208 | if (!token) { |
2209 | ERROR("Failed to parse lxc-user-nic output"); | |
811ef482 | 2210 | return -1; |
74c6e2b0 | 2211 | } |
811ef482 | 2212 | |
94b1cade DJ |
2213 | retlen = strlcpy(netdev->priv.veth_attr.veth1, token, IFNAMSIZ); |
2214 | if (retlen >= IFNAMSIZ) { | |
74c6e2b0 CB |
2215 | ERROR("Host side veth device name returned by lxc-user-nic is " |
2216 | "too long"); | |
2217 | return -E2BIG; | |
2218 | } | |
74c6e2b0 CB |
2219 | |
2220 | /* netdev->priv.veth_attr.ifindex */ | |
2221 | token = strtok_r(NULL, ":", &saveptr); | |
2222 | if (!token) { | |
2223 | ERROR("Failed to parse lxc-user-nic output"); | |
2224 | return -1; | |
2225 | } | |
2226 | ||
2227 | ret = lxc_safe_int(token, &netdev->priv.veth_attr.ifindex); | |
811ef482 | 2228 | if (ret < 0) { |
6d1400b5 | 2229 | errno = -ret; |
2230 | SYSERROR("Failed to convert string \"%s\" to integer", token); | |
811ef482 CB |
2231 | return -1; |
2232 | } | |
2233 | ||
4d781681 | 2234 | if (netdev->upscript) { |
2235 | char *argv[] = { | |
2236 | "veth", | |
2237 | netdev->link, | |
2238 | netdev->priv.veth_attr.veth1, | |
2239 | NULL, | |
2240 | }; | |
2241 | ||
2242 | ret = run_script_argv(lxcname, | |
2243 | hooks_version, "net", | |
2244 | netdev->upscript, "up", argv); | |
2245 | if (ret < 0) | |
2246 | return -1; | |
2247 | } | |
2248 | ||
811ef482 CB |
2249 | return 0; |
2250 | } | |
2251 | ||
f0ecc19d | 2252 | static int lxc_delete_network_unpriv_exec(const char *lxcpath, const char *lxcname, |
1bd8d726 CB |
2253 | struct lxc_netdev *netdev, |
2254 | const char *netns_path) | |
811ef482 CB |
2255 | { |
2256 | int bytes, ret; | |
2257 | pid_t child; | |
2258 | int pipefd[2]; | |
419590da | 2259 | char buffer[PATH_MAX] = {0}; |
811ef482 CB |
2260 | |
2261 | if (netdev->type != LXC_NET_VETH) { | |
2262 | ERROR("Network type %d not support for unprivileged use", netdev->type); | |
2263 | return -1; | |
2264 | } | |
2265 | ||
2266 | ret = pipe(pipefd); | |
2267 | if (ret < 0) { | |
2268 | SYSERROR("Failed to create pipe"); | |
2269 | return -1; | |
2270 | } | |
2271 | ||
2272 | child = fork(); | |
2273 | if (child < 0) { | |
2274 | SYSERROR("Failed to create new process"); | |
2275 | close(pipefd[0]); | |
2276 | close(pipefd[1]); | |
2277 | return -1; | |
2278 | } | |
2279 | ||
2280 | if (child == 0) { | |
8843fde4 | 2281 | char *hostveth; |
811ef482 CB |
2282 | |
2283 | close(pipefd[0]); | |
2284 | ||
2285 | ret = dup2(pipefd[1], STDOUT_FILENO); | |
2286 | if (ret >= 0) | |
2287 | ret = dup2(pipefd[1], STDERR_FILENO); | |
2288 | close(pipefd[1]); | |
2289 | if (ret < 0) { | |
2290 | SYSERROR("Failed to duplicate std{err,out} file descriptor"); | |
a30b9023 | 2291 | _exit(EXIT_FAILURE); |
811ef482 CB |
2292 | } |
2293 | ||
8843fde4 CB |
2294 | if (netdev->priv.veth_attr.pair[0] != '\0') |
2295 | hostveth = netdev->priv.veth_attr.pair; | |
2296 | else | |
2297 | hostveth = netdev->priv.veth_attr.veth1; | |
2298 | if (hostveth[0] == '\0') { | |
74c6e2b0 | 2299 | SYSERROR("Host side veth device name is missing"); |
a30b9023 | 2300 | _exit(EXIT_FAILURE); |
74c6e2b0 CB |
2301 | } |
2302 | ||
de4855a8 | 2303 | if (netdev->link[0] == '\0') { |
811ef482 | 2304 | SYSERROR("Network link for network device \"%s\" is " |
74c6e2b0 | 2305 | "missing", netdev->priv.veth_attr.veth1); |
a30b9023 | 2306 | _exit(EXIT_FAILURE); |
74c6e2b0 | 2307 | } |
811ef482 | 2308 | |
811ef482 | 2309 | INFO("Execing lxc-user-nic delete %s %s %s veth %s %s", lxcpath, |
8843fde4 | 2310 | lxcname, netns_path, netdev->link, hostveth); |
811ef482 | 2311 | execlp(LXC_USERNIC_PATH, LXC_USERNIC_PATH, "delete", lxcpath, |
8843fde4 CB |
2312 | lxcname, netns_path, "veth", netdev->link, hostveth, |
2313 | (char *)NULL); | |
811ef482 | 2314 | SYSERROR("Failed to exec lxc-user-nic."); |
a30b9023 | 2315 | _exit(EXIT_FAILURE); |
811ef482 CB |
2316 | } |
2317 | ||
2318 | close(pipefd[1]); | |
2319 | ||
419590da | 2320 | bytes = lxc_read_nointr(pipefd[0], &buffer, PATH_MAX); |
811ef482 CB |
2321 | if (bytes < 0) { |
2322 | SYSERROR("Failed to read from pipe file descriptor."); | |
2323 | close(pipefd[0]); | |
6b9f82a9 CB |
2324 | } else { |
2325 | buffer[bytes - 1] = '\0'; | |
811ef482 | 2326 | } |
811ef482 | 2327 | |
6b9f82a9 CB |
2328 | ret = wait_for_pid(child); |
2329 | close(pipefd[0]); | |
2330 | if (ret != 0 || bytes < 0) { | |
811ef482 CB |
2331 | ERROR("lxc-user-nic failed to delete requested network: %s", |
2332 | buffer[0] != '\0' ? buffer : "(null)"); | |
811ef482 CB |
2333 | return -1; |
2334 | } | |
2335 | ||
811ef482 CB |
2336 | return 0; |
2337 | } | |
2338 | ||
1bd8d726 CB |
2339 | bool lxc_delete_network_unpriv(struct lxc_handler *handler) |
2340 | { | |
2341 | int ret; | |
2342 | struct lxc_list *iterator; | |
2343 | struct lxc_list *network = &handler->conf->network; | |
2344 | /* strlen("/proc/") = 6 | |
2345 | * + | |
8335fd40 | 2346 | * INTTYPE_TO_STRLEN(pid_t) |
1bd8d726 CB |
2347 | * + |
2348 | * strlen("/fd/") = 4 | |
2349 | * + | |
8335fd40 | 2350 | * INTTYPE_TO_STRLEN(int) |
1bd8d726 CB |
2351 | * + |
2352 | * \0 | |
2353 | */ | |
8335fd40 | 2354 | char netns_path[6 + INTTYPE_TO_STRLEN(pid_t) + 4 + INTTYPE_TO_STRLEN(int) + 1]; |
1bd8d726 CB |
2355 | |
2356 | *netns_path = '\0'; | |
2357 | ||
28d9e29e | 2358 | if (handler->nsfd[LXC_NS_NET] < 0) { |
1bd8d726 CB |
2359 | DEBUG("Cannot not guarantee safe deletion of network devices. " |
2360 | "Manual cleanup maybe needed"); | |
2361 | return false; | |
2362 | } | |
2363 | ||
2364 | ret = snprintf(netns_path, sizeof(netns_path), "/proc/%d/fd/%d", | |
0059379f | 2365 | lxc_raw_getpid(), handler->nsfd[LXC_NS_NET]); |
1bd8d726 CB |
2366 | if (ret < 0 || ret >= sizeof(netns_path)) |
2367 | return false; | |
2368 | ||
2369 | lxc_list_for_each(iterator, network) { | |
2370 | char *hostveth = NULL; | |
2371 | struct lxc_netdev *netdev = iterator->elem; | |
2372 | ||
2373 | /* We can only delete devices whose ifindex we have. If we don't | |
2374 | * have the index it means that we didn't create it. | |
2375 | */ | |
2376 | if (!netdev->ifindex) | |
2377 | continue; | |
2378 | ||
2379 | if (netdev->type == LXC_NET_PHYS) { | |
2380 | ret = lxc_netdev_rename_by_index(netdev->ifindex, | |
2381 | netdev->link); | |
2382 | if (ret < 0) | |
2383 | WARN("Failed to rename interface with index %d " | |
2384 | "to its initial name \"%s\"", | |
2385 | netdev->ifindex, netdev->link); | |
2386 | else | |
2387 | TRACE("Renamed interface with index %d to its " | |
2388 | "initial name \"%s\"", | |
2389 | netdev->ifindex, netdev->link); | |
66a7c406 | 2390 | goto clear_ifindices; |
1bd8d726 CB |
2391 | } |
2392 | ||
2393 | ret = netdev_deconf[netdev->type](handler, netdev); | |
2394 | if (ret < 0) | |
2395 | WARN("Failed to deconfigure network device"); | |
2396 | ||
2397 | if (netdev->type != LXC_NET_VETH) | |
66a7c406 | 2398 | goto clear_ifindices; |
1bd8d726 | 2399 | |
c869be20 | 2400 | if (netdev->link[0] == '\0' || !is_ovs_bridge(netdev->link)) |
66a7c406 | 2401 | goto clear_ifindices; |
1bd8d726 | 2402 | |
8843fde4 CB |
2403 | if (netdev->priv.veth_attr.pair[0] != '\0') |
2404 | hostveth = netdev->priv.veth_attr.pair; | |
2405 | else | |
2406 | hostveth = netdev->priv.veth_attr.veth1; | |
2407 | if (hostveth[0] == '\0') | |
66a7c406 | 2408 | goto clear_ifindices; |
8843fde4 | 2409 | |
1bd8d726 CB |
2410 | ret = lxc_delete_network_unpriv_exec(handler->lxcpath, |
2411 | handler->name, netdev, | |
2412 | netns_path); | |
2413 | if (ret < 0) { | |
1bd8d726 | 2414 | WARN("Failed to remove port \"%s\" from openvswitch " |
8843fde4 | 2415 | "bridge \"%s\"", hostveth, netdev->link); |
66a7c406 | 2416 | goto clear_ifindices; |
1bd8d726 CB |
2417 | } |
2418 | INFO("Removed interface \"%s\" from \"%s\"", hostveth, | |
2419 | netdev->link); | |
66a7c406 CB |
2420 | |
2421 | clear_ifindices: | |
ad2ddfcd | 2422 | /* We need to clear any ifindices we recorded so liblxc won't |
66a7c406 CB |
2423 | * have cached stale data which would cause it to fail on reboot |
2424 | * we're we don't re-read the on-disk config file. | |
2425 | */ | |
2426 | netdev->ifindex = 0; | |
2427 | if (netdev->type == LXC_NET_PHYS) { | |
2428 | netdev->priv.phys_attr.ifindex = 0; | |
2429 | } else if (netdev->type == LXC_NET_VETH) { | |
2430 | netdev->priv.veth_attr.veth1[0] = '\0'; | |
2431 | netdev->priv.veth_attr.ifindex = 0; | |
2432 | } | |
1bd8d726 CB |
2433 | } |
2434 | ||
bb84beda | 2435 | return true; |
1bd8d726 CB |
2436 | } |
2437 | ||
811ef482 CB |
2438 | int lxc_create_network_priv(struct lxc_handler *handler) |
2439 | { | |
811ef482 CB |
2440 | struct lxc_list *iterator; |
2441 | struct lxc_list *network = &handler->conf->network; | |
2442 | ||
d0fbc7ba | 2443 | if (!handler->am_root) |
811ef482 CB |
2444 | return 0; |
2445 | ||
2446 | lxc_list_for_each(iterator, network) { | |
2447 | struct lxc_netdev *netdev = iterator->elem; | |
2448 | ||
2449 | if (netdev->type < 0 || netdev->type > LXC_NET_MAXCONFTYPE) { | |
2450 | ERROR("Invalid network configuration type %d", netdev->type); | |
2451 | return -1; | |
2452 | } | |
2453 | ||
2454 | if (netdev_conf[netdev->type](handler, netdev)) { | |
2455 | ERROR("Failed to create network device"); | |
2456 | return -1; | |
2457 | } | |
2458 | ||
2459 | } | |
2460 | ||
2461 | return 0; | |
2462 | } | |
2463 | ||
f0ecc19d | 2464 | int lxc_network_move_created_netdev_priv(const char *lxcpath, const char *lxcname, |
74c6e2b0 | 2465 | struct lxc_list *network, pid_t pid) |
811ef482 | 2466 | { |
535e8859 | 2467 | int ret; |
811ef482 CB |
2468 | char ifname[IFNAMSIZ]; |
2469 | struct lxc_list *iterator; | |
2470 | ||
e0010464 | 2471 | if (am_guest_unpriv()) |
74c6e2b0 | 2472 | return 0; |
811ef482 CB |
2473 | |
2474 | lxc_list_for_each(iterator, network) { | |
2475 | struct lxc_netdev *netdev = iterator->elem; | |
2476 | ||
811ef482 CB |
2477 | if (!netdev->ifindex) |
2478 | continue; | |
2479 | ||
2480 | /* retrieve the name of the interface */ | |
2481 | if (!if_indextoname(netdev->ifindex, ifname)) { | |
2482 | ERROR("No interface corresponding to ifindex \"%d\"", | |
2483 | netdev->ifindex); | |
2484 | return -1; | |
2485 | } | |
2486 | ||
535e8859 CB |
2487 | ret = lxc_netdev_move_by_name(ifname, pid, NULL); |
2488 | if (ret) { | |
6d1400b5 | 2489 | errno = -ret; |
2490 | SYSERROR("Failed to move network device \"%s\" to " | |
2491 | "network namespace %d", ifname, pid); | |
811ef482 CB |
2492 | return -1; |
2493 | } | |
2494 | ||
2495 | DEBUG("Moved network device \"%s\"/\"%s\" to network namespace " | |
790255cf | 2496 | "of %d", |
535e8859 | 2497 | ifname, netdev->name[0] != '\0' ? netdev->name : "(null)", |
811ef482 CB |
2498 | pid); |
2499 | } | |
2500 | ||
2501 | return 0; | |
2502 | } | |
2503 | ||
f0ecc19d | 2504 | int lxc_create_network_unpriv(const char *lxcpath, const char *lxcname, |
4d781681 | 2505 | struct lxc_list *network, pid_t pid, unsigned int hooks_version) |
74c6e2b0 CB |
2506 | { |
2507 | struct lxc_list *iterator; | |
2508 | ||
e0010464 | 2509 | if (!am_guest_unpriv()) |
74c6e2b0 CB |
2510 | return 0; |
2511 | ||
2512 | lxc_list_for_each(iterator, network) { | |
2513 | struct lxc_netdev *netdev = iterator->elem; | |
2514 | ||
2515 | if (netdev->type == LXC_NET_EMPTY) | |
2516 | continue; | |
2517 | ||
2518 | if (netdev->type == LXC_NET_NONE) | |
2519 | continue; | |
2520 | ||
2521 | if (netdev->type != LXC_NET_VETH) { | |
2522 | ERROR("Networks of type %s are not supported by " | |
2523 | "unprivileged containers", | |
2524 | lxc_net_type_to_str(netdev->type)); | |
2525 | return -1; | |
2526 | } | |
2527 | ||
2528 | if (netdev->mtu) | |
2529 | INFO("mtu ignored due to insufficient privilege"); | |
2530 | ||
4d781681 | 2531 | if (lxc_create_network_unpriv_exec(lxcpath, lxcname, netdev, pid, hooks_version)) |
74c6e2b0 CB |
2532 | return -1; |
2533 | } | |
2534 | ||
2535 | return 0; | |
2536 | } | |
2537 | ||
1bd8d726 | 2538 | bool lxc_delete_network_priv(struct lxc_handler *handler) |
811ef482 CB |
2539 | { |
2540 | int ret; | |
2541 | struct lxc_list *iterator; | |
2542 | struct lxc_list *network = &handler->conf->network; | |
1bd8d726 | 2543 | |
811ef482 CB |
2544 | lxc_list_for_each(iterator, network) { |
2545 | char *hostveth = NULL; | |
2546 | struct lxc_netdev *netdev = iterator->elem; | |
2547 | ||
2548 | /* We can only delete devices whose ifindex we have. If we don't | |
2549 | * have the index it means that we didn't create it. | |
2550 | */ | |
2551 | if (!netdev->ifindex) | |
2552 | continue; | |
2553 | ||
2554 | if (netdev->type == LXC_NET_PHYS) { | |
2555 | ret = lxc_netdev_rename_by_index(netdev->ifindex, netdev->link); | |
2556 | if (ret < 0) | |
2557 | WARN("Failed to rename interface with index %d " | |
b809f232 CB |
2558 | "from \"%s\" to its initial name \"%s\"", |
2559 | netdev->ifindex, netdev->name, netdev->link); | |
811ef482 | 2560 | else |
29589196 CB |
2561 | TRACE("Renamed interface with index %d from " |
2562 | "\"%s\" to its initial name \"%s\"", | |
2563 | netdev->ifindex, netdev->name, | |
2564 | netdev->link); | |
66a7c406 | 2565 | goto clear_ifindices; |
811ef482 CB |
2566 | } |
2567 | ||
2568 | ret = netdev_deconf[netdev->type](handler, netdev); | |
2569 | if (ret < 0) | |
2570 | WARN("Failed to deconfigure network device"); | |
2571 | ||
2572 | /* Recent kernels remove the virtual interfaces when the network | |
2573 | * namespace is destroyed but in case we did not move the | |
2574 | * interface to the network namespace, we have to destroy it. | |
2575 | */ | |
1bd8d726 | 2576 | ret = lxc_netdev_delete_by_index(netdev->ifindex); |
78ab281c CB |
2577 | if (ret < 0) { |
2578 | if (errno != ENODEV) { | |
2579 | WARN("Failed to remove interface \"%s\" with index %d", | |
2580 | netdev->name[0] != '\0' ? netdev->name : "(null)", | |
2581 | netdev->ifindex); | |
2582 | goto clear_ifindices; | |
2583 | } | |
2584 | INFO("Interface \"%s\" with index %d already deleted or existing in different network namespace", | |
24548539 CB |
2585 | netdev->name[0] != '\0' ? netdev->name : "(null)", |
2586 | netdev->ifindex); | |
811ef482 | 2587 | } |
1bd8d726 | 2588 | INFO("Removed interface \"%s\" with index %d", |
52845118 CB |
2589 | netdev->name[0] != '\0' ? netdev->name : "(null)", |
2590 | netdev->ifindex); | |
811ef482 CB |
2591 | |
2592 | if (netdev->type != LXC_NET_VETH) | |
66a7c406 | 2593 | goto clear_ifindices; |
811ef482 | 2594 | |
811ef482 CB |
2595 | /* Explicitly delete host veth device to prevent lingering |
2596 | * devices. We had issues in LXD around this. | |
2597 | */ | |
de4855a8 | 2598 | if (netdev->priv.veth_attr.pair[0] != '\0') |
811ef482 CB |
2599 | hostveth = netdev->priv.veth_attr.pair; |
2600 | else | |
2601 | hostveth = netdev->priv.veth_attr.veth1; | |
de4855a8 | 2602 | if (hostveth[0] == '\0') |
66a7c406 | 2603 | goto clear_ifindices; |
811ef482 CB |
2604 | |
2605 | ret = lxc_netdev_delete_by_name(hostveth); | |
2606 | if (ret < 0) { | |
24548539 CB |
2607 | WARN("Failed to remove interface \"%s\" from \"%s\"", |
2608 | hostveth, netdev->link); | |
66a7c406 | 2609 | goto clear_ifindices; |
811ef482 CB |
2610 | } |
2611 | INFO("Removed interface \"%s\" from \"%s\"", hostveth, netdev->link); | |
2612 | ||
c869be20 | 2613 | if (netdev->link[0] == '\0' || !is_ovs_bridge(netdev->link)) { |
811ef482 | 2614 | netdev->priv.veth_attr.veth1[0] = '\0'; |
66a7c406 CB |
2615 | netdev->ifindex = 0; |
2616 | netdev->priv.veth_attr.ifindex = 0; | |
2617 | goto clear_ifindices; | |
811ef482 CB |
2618 | } |
2619 | ||
2620 | /* Delete the openvswitch port. */ | |
2621 | ret = lxc_ovs_delete_port(netdev->link, hostveth); | |
2622 | if (ret < 0) | |
2623 | WARN("Failed to remove port \"%s\" from openvswitch " | |
2624 | "bridge \"%s\"", hostveth, netdev->link); | |
2625 | else | |
2626 | INFO("Removed port \"%s\" from openvswitch bridge \"%s\"", | |
2627 | hostveth, netdev->link); | |
2628 | ||
66a7c406 | 2629 | clear_ifindices: |
ad2ddfcd | 2630 | /* We need to clear any ifindices we recorded so liblxc won't |
66a7c406 CB |
2631 | * have cached stale data which would cause it to fail on reboot |
2632 | * we're we don't re-read the on-disk config file. | |
2633 | */ | |
2634 | netdev->ifindex = 0; | |
2635 | if (netdev->type == LXC_NET_PHYS) { | |
2636 | netdev->priv.phys_attr.ifindex = 0; | |
2637 | } else if (netdev->type == LXC_NET_VETH) { | |
2638 | netdev->priv.veth_attr.veth1[0] = '\0'; | |
2639 | netdev->priv.veth_attr.ifindex = 0; | |
2640 | } | |
811ef482 CB |
2641 | } |
2642 | ||
bb84beda | 2643 | return true; |
811ef482 CB |
2644 | } |
2645 | ||
2646 | int lxc_requests_empty_network(struct lxc_handler *handler) | |
2647 | { | |
2648 | struct lxc_list *network = &handler->conf->network; | |
2649 | struct lxc_list *iterator; | |
2650 | bool found_none = false, found_nic = false; | |
2651 | ||
2652 | if (lxc_list_empty(network)) | |
2653 | return 0; | |
2654 | ||
2655 | lxc_list_for_each(iterator, network) { | |
2656 | struct lxc_netdev *netdev = iterator->elem; | |
2657 | ||
2658 | if (netdev->type == LXC_NET_NONE) | |
2659 | found_none = true; | |
2660 | else | |
2661 | found_nic = true; | |
2662 | } | |
2663 | if (found_none && !found_nic) | |
2664 | return 1; | |
2665 | return 0; | |
2666 | } | |
2667 | ||
2668 | /* try to move physical nics to the init netns */ | |
b809f232 | 2669 | int lxc_restore_phys_nics_to_netns(struct lxc_handler *handler) |
811ef482 CB |
2670 | { |
2671 | int ret; | |
b809f232 | 2672 | int oldfd; |
811ef482 | 2673 | char ifname[IFNAMSIZ]; |
b809f232 | 2674 | struct lxc_list *iterator; |
28d9e29e | 2675 | int netnsfd = handler->nsfd[LXC_NS_NET]; |
b809f232 | 2676 | struct lxc_conf *conf = handler->conf; |
811ef482 | 2677 | |
b809f232 CB |
2678 | /* We need CAP_NET_ADMIN in the parent namespace in order to setns() to |
2679 | * the parent network namespace. We won't have this capability if we are | |
2680 | * unprivileged. | |
2681 | */ | |
d0fbc7ba | 2682 | if (!handler->am_root) |
b809f232 | 2683 | return 0; |
811ef482 | 2684 | |
b809f232 | 2685 | TRACE("Moving physical network devices back to parent network namespace"); |
811ef482 | 2686 | |
0059379f | 2687 | oldfd = lxc_preserve_ns(lxc_raw_getpid(), "net"); |
811ef482 CB |
2688 | if (oldfd < 0) { |
2689 | SYSERROR("Failed to preserve network namespace"); | |
b809f232 | 2690 | return -1; |
811ef482 CB |
2691 | } |
2692 | ||
b809f232 | 2693 | ret = setns(netnsfd, CLONE_NEWNET); |
811ef482 CB |
2694 | if (ret < 0) { |
2695 | SYSERROR("Failed to enter network namespace"); | |
2696 | close(oldfd); | |
b809f232 | 2697 | return -1; |
811ef482 CB |
2698 | } |
2699 | ||
b809f232 CB |
2700 | lxc_list_for_each(iterator, &conf->network) { |
2701 | struct lxc_netdev *netdev = iterator->elem; | |
811ef482 | 2702 | |
b809f232 CB |
2703 | if (netdev->type != LXC_NET_PHYS) |
2704 | continue; | |
2705 | ||
2706 | /* Retrieve the name of the interface in the container's network | |
2707 | * namespace. | |
2708 | */ | |
2709 | if (!if_indextoname(netdev->ifindex, ifname)) { | |
811ef482 | 2710 | WARN("No interface corresponding to ifindex %d", |
b809f232 | 2711 | netdev->ifindex); |
811ef482 CB |
2712 | continue; |
2713 | } | |
b809f232 CB |
2714 | |
2715 | ret = lxc_netdev_move_by_name(ifname, 1, netdev->link); | |
2716 | if (ret < 0) | |
811ef482 CB |
2717 | WARN("Error moving network device \"%s\" back to " |
2718 | "network namespace", ifname); | |
b809f232 CB |
2719 | else |
2720 | TRACE("Moved network device \"%s\" back to network " | |
2721 | "namespace", ifname); | |
811ef482 | 2722 | } |
811ef482 | 2723 | |
b809f232 | 2724 | ret = setns(oldfd, CLONE_NEWNET); |
811ef482 | 2725 | close(oldfd); |
b809f232 CB |
2726 | if (ret < 0) { |
2727 | SYSERROR("Failed to enter network namespace"); | |
2728 | return -1; | |
2729 | } | |
2730 | ||
2731 | return 0; | |
811ef482 CB |
2732 | } |
2733 | ||
2734 | static int setup_hw_addr(char *hwaddr, const char *ifname) | |
2735 | { | |
2736 | struct sockaddr sockaddr; | |
2737 | struct ifreq ifr; | |
6d1400b5 | 2738 | int ret, fd; |
811ef482 CB |
2739 | |
2740 | ret = lxc_convert_mac(hwaddr, &sockaddr); | |
2741 | if (ret) { | |
6d1400b5 | 2742 | errno = -ret; |
2743 | SYSERROR("Mac address \"%s\" conversion failed", hwaddr); | |
811ef482 CB |
2744 | return -1; |
2745 | } | |
2746 | ||
2747 | memcpy(ifr.ifr_name, ifname, IFNAMSIZ); | |
2748 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; | |
2749 | memcpy((char *) &ifr.ifr_hwaddr, (char *) &sockaddr, sizeof(sockaddr)); | |
2750 | ||
2751 | fd = socket(AF_INET, SOCK_DGRAM, 0); | |
2752 | if (fd < 0) | |
2753 | return -1; | |
2754 | ||
2755 | ret = ioctl(fd, SIOCSIFHWADDR, &ifr); | |
811ef482 | 2756 | if (ret) |
6d1400b5 | 2757 | SYSERROR("Failed to perform ioctl"); |
2758 | ||
2759 | close(fd); | |
811ef482 CB |
2760 | |
2761 | DEBUG("Mac address \"%s\" on \"%s\" has been setup", hwaddr, | |
2762 | ifr.ifr_name); | |
2763 | ||
2764 | return ret; | |
2765 | } | |
2766 | ||
2767 | static int setup_ipv4_addr(struct lxc_list *ip, int ifindex) | |
2768 | { | |
2769 | struct lxc_list *iterator; | |
2770 | int err; | |
2771 | ||
2772 | lxc_list_for_each(iterator, ip) { | |
2773 | struct lxc_inetdev *inetdev = iterator->elem; | |
2774 | ||
2775 | err = lxc_ipv4_addr_add(ifindex, &inetdev->addr, | |
2776 | &inetdev->bcast, inetdev->prefix); | |
2777 | if (err) { | |
6d1400b5 | 2778 | errno = -err; |
2779 | SYSERROR("Failed to setup ipv4 address for network device " | |
2780 | "with eifindex %d", ifindex); | |
811ef482 CB |
2781 | return -1; |
2782 | } | |
2783 | } | |
2784 | ||
2785 | return 0; | |
2786 | } | |
2787 | ||
2788 | static int setup_ipv6_addr(struct lxc_list *ip, int ifindex) | |
2789 | { | |
2790 | struct lxc_list *iterator; | |
2791 | int err; | |
2792 | ||
2793 | lxc_list_for_each(iterator, ip) { | |
2794 | struct lxc_inet6dev *inet6dev = iterator->elem; | |
2795 | ||
2796 | err = lxc_ipv6_addr_add(ifindex, &inet6dev->addr, | |
2797 | &inet6dev->mcast, &inet6dev->acast, | |
2798 | inet6dev->prefix); | |
2799 | if (err) { | |
6d1400b5 | 2800 | errno = -err; |
2801 | SYSERROR("Failed to setup ipv6 address for network device " | |
2802 | "with eifindex %d", ifindex); | |
811ef482 CB |
2803 | return -1; |
2804 | } | |
2805 | } | |
2806 | ||
2807 | return 0; | |
2808 | } | |
2809 | ||
2810 | static int lxc_setup_netdev_in_child_namespaces(struct lxc_netdev *netdev) | |
2811 | { | |
2812 | char ifname[IFNAMSIZ]; | |
2813 | int err; | |
2814 | const char *net_type_name; | |
2815 | char *current_ifname = ifname; | |
2816 | ||
2817 | /* empty network namespace */ | |
2818 | if (!netdev->ifindex) { | |
2819 | if (netdev->flags & IFF_UP) { | |
2820 | err = lxc_netdev_up("lo"); | |
2821 | if (err) { | |
6d1400b5 | 2822 | errno = -err; |
2823 | SYSERROR("Failed to set the loopback network device up"); | |
811ef482 CB |
2824 | return -1; |
2825 | } | |
2826 | } | |
2827 | ||
2828 | if (netdev->type == LXC_NET_EMPTY) | |
2829 | return 0; | |
2830 | ||
2831 | if (netdev->type == LXC_NET_NONE) | |
2832 | return 0; | |
2833 | ||
2834 | if (netdev->type != LXC_NET_VETH) { | |
2835 | net_type_name = lxc_net_type_to_str(netdev->type); | |
2836 | ERROR("%s networks are not supported for containers " | |
535e8859 | 2837 | "not setup up by privileged users", net_type_name); |
811ef482 CB |
2838 | return -1; |
2839 | } | |
2840 | ||
2841 | netdev->ifindex = if_nametoindex(netdev->name); | |
2842 | } | |
2843 | ||
2844 | /* get the new ifindex in case of physical netdev */ | |
2845 | if (netdev->type == LXC_NET_PHYS) { | |
2846 | netdev->ifindex = if_nametoindex(netdev->link); | |
2847 | if (!netdev->ifindex) { | |
2848 | ERROR("Failed to get ifindex for network device \"%s\"", | |
2849 | netdev->link); | |
2850 | return -1; | |
2851 | } | |
2852 | } | |
2853 | ||
2854 | /* retrieve the name of the interface */ | |
2855 | if (!if_indextoname(netdev->ifindex, current_ifname)) { | |
2856 | ERROR("Failed get name for network device with ifindex %d", | |
2857 | netdev->ifindex); | |
2858 | return -1; | |
2859 | } | |
2860 | ||
2861 | /* Default: let the system to choose one interface name. | |
2862 | * When the IFLA_IFNAME attribute is passed something like "<prefix>%d" | |
2863 | * netlink will replace the format specifier with an appropriate index. | |
2864 | */ | |
de4855a8 CB |
2865 | if (netdev->name[0] == '\0') { |
2866 | if (netdev->type == LXC_NET_PHYS) | |
94b1cade | 2867 | (void)strlcpy(netdev->name, netdev->link, IFNAMSIZ); |
de4855a8 | 2868 | else |
94b1cade | 2869 | (void)strlcpy(netdev->name, "eth%d", IFNAMSIZ); |
de4855a8 | 2870 | } |
811ef482 CB |
2871 | |
2872 | /* rename the interface name */ | |
2873 | if (strcmp(ifname, netdev->name) != 0) { | |
2874 | err = lxc_netdev_rename_by_name(ifname, netdev->name); | |
2875 | if (err) { | |
6d1400b5 | 2876 | errno = -err; |
2877 | SYSERROR("Failed to rename network device \"%s\" to \"%s\"", | |
2878 | ifname, netdev->name); | |
811ef482 CB |
2879 | return -1; |
2880 | } | |
2881 | } | |
2882 | ||
2883 | /* Re-read the name of the interface because its name has changed | |
2884 | * and would be automatically allocated by the system | |
2885 | */ | |
2886 | if (!if_indextoname(netdev->ifindex, current_ifname)) { | |
2887 | ERROR("Failed get name for network device with ifindex %d", | |
2888 | netdev->ifindex); | |
2889 | return -1; | |
2890 | } | |
2891 | ||
790255cf CB |
2892 | /* Now update the recorded name of the network device to reflect the |
2893 | * name of the network device in the child's network namespace. We will | |
2894 | * later on send this information back to the parent. | |
2895 | */ | |
94b1cade | 2896 | (void)strlcpy(netdev->name, current_ifname, IFNAMSIZ); |
790255cf | 2897 | |
811ef482 CB |
2898 | /* set a mac address */ |
2899 | if (netdev->hwaddr) { | |
2900 | if (setup_hw_addr(netdev->hwaddr, current_ifname)) { | |
2901 | ERROR("Failed to setup hw address for network device \"%s\"", | |
2902 | current_ifname); | |
2903 | return -1; | |
2904 | } | |
2905 | } | |
2906 | ||
2907 | /* setup ipv4 addresses on the interface */ | |
2908 | if (setup_ipv4_addr(&netdev->ipv4, netdev->ifindex)) { | |
2909 | ERROR("Failed to setup ip addresses for network device \"%s\"", | |
2910 | ifname); | |
2911 | return -1; | |
2912 | } | |
2913 | ||
2914 | /* setup ipv6 addresses on the interface */ | |
2915 | if (setup_ipv6_addr(&netdev->ipv6, netdev->ifindex)) { | |
2916 | ERROR("Failed to setup ipv6 addresses for network device \"%s\"", | |
2917 | ifname); | |
2918 | return -1; | |
2919 | } | |
2920 | ||
2921 | /* set the network device up */ | |
2922 | if (netdev->flags & IFF_UP) { | |
811ef482 CB |
2923 | err = lxc_netdev_up(current_ifname); |
2924 | if (err) { | |
6d1400b5 | 2925 | errno = -err; |
2926 | SYSERROR("Failed to set network device \"%s\" up", | |
2927 | current_ifname); | |
811ef482 CB |
2928 | return -1; |
2929 | } | |
2930 | ||
2931 | /* the network is up, make the loopback up too */ | |
2932 | err = lxc_netdev_up("lo"); | |
2933 | if (err) { | |
6d1400b5 | 2934 | errno = -err; |
2935 | SYSERROR("Failed to set the loopback network device up"); | |
811ef482 CB |
2936 | return -1; |
2937 | } | |
2938 | } | |
2939 | ||
2940 | /* We can only set up the default routes after bringing | |
2941 | * up the interface, sine bringing up the interface adds | |
2942 | * the link-local routes and we can't add a default | |
2943 | * route if the gateway is not reachable. */ | |
2944 | ||
2945 | /* setup ipv4 gateway on the interface */ | |
2946 | if (netdev->ipv4_gateway) { | |
2947 | if (!(netdev->flags & IFF_UP)) { | |
2948 | ERROR("Cannot add ipv4 gateway for network device " | |
2949 | "\"%s\" when not bringing up the interface", ifname); | |
2950 | return -1; | |
2951 | } | |
2952 | ||
2953 | if (lxc_list_empty(&netdev->ipv4)) { | |
2954 | ERROR("Cannot add ipv4 gateway for network device " | |
2955 | "\"%s\" when not assigning an address", ifname); | |
2956 | return -1; | |
2957 | } | |
2958 | ||
2959 | err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway); | |
2960 | if (err) { | |
2961 | err = lxc_ipv4_dest_add(netdev->ifindex, netdev->ipv4_gateway); | |
2962 | if (err) { | |
6d1400b5 | 2963 | errno = -err; |
2964 | SYSERROR("Failed to add ipv4 dest for network device \"%s\"", | |
2965 | ifname); | |
811ef482 CB |
2966 | } |
2967 | ||
2968 | err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway); | |
2969 | if (err) { | |
6d1400b5 | 2970 | errno = -err; |
2971 | SYSERROR("Failed to setup ipv4 gateway for network device \"%s\"", | |
2972 | ifname); | |
2973 | ||
811ef482 CB |
2974 | if (netdev->ipv4_gateway_auto) { |
2975 | char buf[INET_ADDRSTRLEN]; | |
2976 | inet_ntop(AF_INET, netdev->ipv4_gateway, buf, sizeof(buf)); | |
2977 | ERROR("Fried to set autodetected ipv4 gateway \"%s\"", buf); | |
2978 | } | |
2979 | return -1; | |
2980 | } | |
2981 | } | |
2982 | } | |
2983 | ||
2984 | /* setup ipv6 gateway on the interface */ | |
2985 | if (netdev->ipv6_gateway) { | |
2986 | if (!(netdev->flags & IFF_UP)) { | |
2987 | ERROR("Cannot add ipv6 gateway for network device " | |
2988 | "\"%s\" when not bringing up the interface", ifname); | |
2989 | return -1; | |
2990 | } | |
2991 | ||
2992 | if (lxc_list_empty(&netdev->ipv6) && !IN6_IS_ADDR_LINKLOCAL(netdev->ipv6_gateway)) { | |
2993 | ERROR("Cannot add ipv6 gateway for network device " | |
2994 | "\"%s\" when not assigning an address", ifname); | |
2995 | return -1; | |
2996 | } | |
2997 | ||
2998 | err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway); | |
2999 | if (err) { | |
3000 | err = lxc_ipv6_dest_add(netdev->ifindex, netdev->ipv6_gateway); | |
3001 | if (err) { | |
6d1400b5 | 3002 | errno = -err; |
3003 | SYSERROR("Failed to add ipv6 dest for network device \"%s\"", | |
3004 | ifname); | |
811ef482 CB |
3005 | } |
3006 | ||
3007 | err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway); | |
3008 | if (err) { | |
6d1400b5 | 3009 | errno = -err; |
3010 | SYSERROR("Failed to setup ipv6 gateway for network device \"%s\"", | |
3011 | ifname); | |
3012 | ||
811ef482 CB |
3013 | if (netdev->ipv6_gateway_auto) { |
3014 | char buf[INET6_ADDRSTRLEN]; | |
3015 | inet_ntop(AF_INET6, netdev->ipv6_gateway, buf, sizeof(buf)); | |
3016 | ERROR("Tried to set autodetected ipv6 " | |
3017 | "gateway for network device " | |
3018 | "\"%s\"", buf); | |
3019 | } | |
3020 | return -1; | |
3021 | } | |
3022 | } | |
3023 | } | |
3024 | ||
74c6e2b0 | 3025 | DEBUG("Network device \"%s\" has been setup", current_ifname); |
811ef482 CB |
3026 | |
3027 | return 0; | |
3028 | } | |
3029 | ||
3030 | int lxc_setup_network_in_child_namespaces(const struct lxc_conf *conf, | |
3031 | struct lxc_list *network) | |
3032 | { | |
3033 | struct lxc_list *iterator; | |
3034 | struct lxc_netdev *netdev; | |
3035 | ||
811ef482 CB |
3036 | lxc_list_for_each(iterator, network) { |
3037 | netdev = iterator->elem; | |
3038 | ||
811ef482 CB |
3039 | if (lxc_setup_netdev_in_child_namespaces(netdev)) { |
3040 | ERROR("failed to setup netdev"); | |
3041 | return -1; | |
3042 | } | |
3043 | } | |
3044 | ||
3045 | if (!lxc_list_empty(network)) | |
3046 | INFO("network has been setup"); | |
3047 | ||
3048 | return 0; | |
3049 | } | |
7ab1ba02 CB |
3050 | |
3051 | int lxc_network_send_veth_names_to_child(struct lxc_handler *handler) | |
3052 | { | |
3053 | struct lxc_list *iterator; | |
3054 | struct lxc_list *network = &handler->conf->network; | |
3055 | int data_sock = handler->data_sock[0]; | |
3056 | ||
d0fbc7ba | 3057 | if (handler->am_root) |
7ab1ba02 CB |
3058 | return 0; |
3059 | ||
3060 | lxc_list_for_each(iterator, network) { | |
3061 | int ret; | |
3062 | struct lxc_netdev *netdev = iterator->elem; | |
3063 | ||
3064 | if (netdev->type != LXC_NET_VETH) | |
3065 | continue; | |
3066 | ||
7fbb15ec | 3067 | ret = lxc_send_nointr(data_sock, netdev->name, IFNAMSIZ, MSG_NOSIGNAL); |
7729f8e5 | 3068 | if (ret < 0) |
7ab1ba02 | 3069 | return -1; |
7729f8e5 | 3070 | TRACE("Sent network device name \"%s\" to child", netdev->name); |
7ab1ba02 CB |
3071 | } |
3072 | ||
3073 | return 0; | |
3074 | } | |
3075 | ||
3076 | int lxc_network_recv_veth_names_from_parent(struct lxc_handler *handler) | |
3077 | { | |
3078 | struct lxc_list *iterator; | |
3079 | struct lxc_list *network = &handler->conf->network; | |
3080 | int data_sock = handler->data_sock[1]; | |
3081 | ||
d0fbc7ba | 3082 | if (handler->am_root) |
7ab1ba02 CB |
3083 | return 0; |
3084 | ||
3085 | lxc_list_for_each(iterator, network) { | |
3086 | int ret; | |
3087 | struct lxc_netdev *netdev = iterator->elem; | |
3088 | ||
3089 | if (netdev->type != LXC_NET_VETH) | |
3090 | continue; | |
3091 | ||
e3233f26 | 3092 | ret = lxc_recv_nointr(data_sock, netdev->name, IFNAMSIZ, 0); |
7729f8e5 | 3093 | if (ret < 0) |
7ab1ba02 | 3094 | return -1; |
7729f8e5 | 3095 | TRACE("Received network device name \"%s\" from parent", netdev->name); |
7ab1ba02 CB |
3096 | } |
3097 | ||
3098 | return 0; | |
3099 | } | |
a1ae535a CB |
3100 | |
3101 | int lxc_network_send_name_and_ifindex_to_parent(struct lxc_handler *handler) | |
3102 | { | |
3103 | struct lxc_list *iterator, *network; | |
3104 | int data_sock = handler->data_sock[0]; | |
3105 | ||
3106 | if (!handler->am_root) | |
3107 | return 0; | |
3108 | ||
3109 | network = &handler->conf->network; | |
3110 | lxc_list_for_each(iterator, network) { | |
3111 | int ret; | |
3112 | struct lxc_netdev *netdev = iterator->elem; | |
3113 | ||
3114 | /* Send network device name in the child's namespace to parent. */ | |
7fbb15ec | 3115 | ret = lxc_send_nointr(data_sock, netdev->name, IFNAMSIZ, MSG_NOSIGNAL); |
a1ae535a | 3116 | if (ret < 0) |
7729f8e5 | 3117 | return -1; |
a1ae535a CB |
3118 | |
3119 | /* Send network device ifindex in the child's namespace to | |
3120 | * parent. | |
3121 | */ | |
7fbb15ec | 3122 | ret = lxc_send_nointr(data_sock, &netdev->ifindex, sizeof(netdev->ifindex), MSG_NOSIGNAL); |
a1ae535a | 3123 | if (ret < 0) |
7729f8e5 | 3124 | return -1; |
a1ae535a CB |
3125 | } |
3126 | ||
ad2ddfcd | 3127 | TRACE("Sent network device names and ifindices to parent"); |
a1ae535a | 3128 | return 0; |
a1ae535a CB |
3129 | } |
3130 | ||
3131 | int lxc_network_recv_name_and_ifindex_from_child(struct lxc_handler *handler) | |
3132 | { | |
3133 | struct lxc_list *iterator, *network; | |
3134 | int data_sock = handler->data_sock[1]; | |
3135 | ||
3136 | if (!handler->am_root) | |
3137 | return 0; | |
3138 | ||
3139 | network = &handler->conf->network; | |
3140 | lxc_list_for_each(iterator, network) { | |
3141 | int ret; | |
3142 | struct lxc_netdev *netdev = iterator->elem; | |
3143 | ||
3144 | /* Receive network device name in the child's namespace to | |
3145 | * parent. | |
3146 | */ | |
e3233f26 | 3147 | ret = lxc_recv_nointr(data_sock, netdev->name, IFNAMSIZ, 0); |
a1ae535a | 3148 | if (ret < 0) |
7729f8e5 | 3149 | return -1; |
a1ae535a CB |
3150 | |
3151 | /* Receive network device ifindex in the child's namespace to | |
3152 | * parent. | |
3153 | */ | |
e3233f26 | 3154 | ret = lxc_recv_nointr(data_sock, &netdev->ifindex, sizeof(netdev->ifindex), 0); |
a1ae535a | 3155 | if (ret < 0) |
7729f8e5 | 3156 | return -1; |
a1ae535a CB |
3157 | } |
3158 | ||
3159 | return 0; | |
a1ae535a | 3160 | } |
bb84beda CB |
3161 | |
3162 | void lxc_delete_network(struct lxc_handler *handler) | |
3163 | { | |
3164 | bool bret; | |
3165 | ||
3166 | if (handler->am_root) | |
3167 | bret = lxc_delete_network_priv(handler); | |
3168 | else | |
3169 | bret = lxc_delete_network_unpriv(handler); | |
3170 | if (!bret) | |
3171 | DEBUG("Failed to delete network devices"); | |
3172 | else | |
3173 | DEBUG("Deleted network devices"); | |
3174 | } | |
1cd95214 | 3175 | |
1cd95214 CB |
3176 | int lxc_netns_set_nsid(int fd) |
3177 | { | |
41a3300d | 3178 | int ret; |
0ce60f0d CB |
3179 | char buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) + |
3180 | NLMSG_ALIGN(sizeof(struct rtgenmsg)) + | |
3181 | NLMSG_ALIGN(1024)]; | |
1cd95214 | 3182 | struct nl_handler nlh; |
0ce60f0d CB |
3183 | struct nlmsghdr *hdr; |
3184 | struct rtgenmsg *msg; | |
bfcedc7e | 3185 | int saved_errno; |
9d036caa CB |
3186 | const __s32 ns_id = -1; |
3187 | const __u32 netns_fd = fd; | |
1cd95214 CB |
3188 | |
3189 | ret = netlink_open(&nlh, NETLINK_ROUTE); | |
3190 | if (ret < 0) | |
41a3300d | 3191 | return -1; |
1cd95214 | 3192 | |
0ce60f0d | 3193 | memset(buf, 0, sizeof(buf)); |
6ce39620 CB |
3194 | |
3195 | #pragma GCC diagnostic push | |
3196 | #pragma GCC diagnostic ignored "-Wcast-align" | |
0ce60f0d CB |
3197 | hdr = (struct nlmsghdr *)buf; |
3198 | msg = (struct rtgenmsg *)NLMSG_DATA(hdr); | |
6ce39620 | 3199 | #pragma GCC diagnostic pop |
1cd95214 | 3200 | |
0ce60f0d CB |
3201 | hdr->nlmsg_len = NLMSG_LENGTH(sizeof(*msg)); |
3202 | hdr->nlmsg_type = RTM_NEWNSID; | |
3203 | hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
3204 | hdr->nlmsg_pid = 0; | |
3205 | hdr->nlmsg_seq = RTM_NEWNSID; | |
3206 | msg->rtgen_family = AF_UNSPEC; | |
1cd95214 | 3207 | |
9d036caa CB |
3208 | ret = addattr(hdr, 1024, __LXC_NETNSA_FD, &netns_fd, sizeof(netns_fd)); |
3209 | if (ret < 0) | |
3210 | goto on_error; | |
3211 | ||
3212 | ret = addattr(hdr, 1024, __LXC_NETNSA_NSID, &ns_id, sizeof(ns_id)); | |
3213 | if (ret < 0) | |
3214 | goto on_error; | |
1cd95214 | 3215 | |
9fbbc427 | 3216 | ret = __netlink_transaction(&nlh, hdr, hdr); |
9d036caa CB |
3217 | |
3218 | on_error: | |
bfcedc7e | 3219 | saved_errno = errno; |
1cd95214 | 3220 | netlink_close(&nlh); |
bfcedc7e | 3221 | errno = saved_errno; |
1cd95214 | 3222 | |
9d036caa | 3223 | return ret; |
1cd95214 | 3224 | } |
938980ba CB |
3225 | |
3226 | static int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len) | |
3227 | { | |
3228 | ||
3229 | memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); | |
3230 | ||
3231 | while (RTA_OK(rta, len)) { | |
3232 | unsigned short type = rta->rta_type; | |
3233 | ||
3234 | if ((type <= max) && (!tb[type])) | |
3235 | tb[type] = rta; | |
3236 | ||
6ce39620 CB |
3237 | #pragma GCC diagnostic push |
3238 | #pragma GCC diagnostic ignored "-Wcast-align" | |
938980ba | 3239 | rta = RTA_NEXT(rta, len); |
6ce39620 | 3240 | #pragma GCC diagnostic pop |
938980ba CB |
3241 | } |
3242 | ||
3243 | return 0; | |
3244 | } | |
3245 | ||
3246 | static inline __s32 rta_getattr_s32(const struct rtattr *rta) | |
3247 | { | |
3248 | return *(__s32 *)RTA_DATA(rta); | |
3249 | } | |
3250 | ||
3251 | #ifndef NETNS_RTA | |
3252 | #define NETNS_RTA(r) \ | |
3253 | ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg)))) | |
3254 | #endif | |
3255 | ||
3256 | int lxc_netns_get_nsid(int fd) | |
3257 | { | |
3258 | int ret; | |
3259 | ssize_t len; | |
3260 | char buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) + | |
9d036caa CB |
3261 | NLMSG_ALIGN(sizeof(struct rtgenmsg)) + |
3262 | NLMSG_ALIGN(1024)]; | |
938980ba CB |
3263 | struct rtattr *tb[__LXC_NETNSA_MAX + 1]; |
3264 | struct nl_handler nlh; | |
3265 | struct nlmsghdr *hdr; | |
3266 | struct rtgenmsg *msg; | |
3267 | int saved_errno; | |
3268 | __u32 netns_fd = fd; | |
3269 | ||
3270 | ret = netlink_open(&nlh, NETLINK_ROUTE); | |
3271 | if (ret < 0) | |
3272 | return -1; | |
3273 | ||
3274 | memset(buf, 0, sizeof(buf)); | |
6ce39620 CB |
3275 | |
3276 | #pragma GCC diagnostic push | |
3277 | #pragma GCC diagnostic ignored "-Wcast-align" | |
938980ba CB |
3278 | hdr = (struct nlmsghdr *)buf; |
3279 | msg = (struct rtgenmsg *)NLMSG_DATA(hdr); | |
6ce39620 | 3280 | #pragma GCC diagnostic pop |
938980ba CB |
3281 | |
3282 | hdr->nlmsg_len = NLMSG_LENGTH(sizeof(*msg)); | |
3283 | hdr->nlmsg_type = RTM_GETNSID; | |
3284 | hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
3285 | hdr->nlmsg_pid = 0; | |
3286 | hdr->nlmsg_seq = RTM_GETNSID; | |
3287 | msg->rtgen_family = AF_UNSPEC; | |
3288 | ||
9d036caa CB |
3289 | ret = addattr(hdr, 1024, __LXC_NETNSA_FD, &netns_fd, sizeof(netns_fd)); |
3290 | if (ret == 0) | |
3291 | ret = __netlink_transaction(&nlh, hdr, hdr); | |
938980ba | 3292 | |
938980ba CB |
3293 | saved_errno = errno; |
3294 | netlink_close(&nlh); | |
3295 | errno = saved_errno; | |
3296 | if (ret < 0) | |
3297 | return -1; | |
3298 | ||
9d036caa | 3299 | errno = EINVAL; |
938980ba CB |
3300 | msg = NLMSG_DATA(hdr); |
3301 | len = hdr->nlmsg_len - NLMSG_SPACE(sizeof(*msg)); | |
3302 | if (len < 0) | |
3303 | return -1; | |
3304 | ||
6ce39620 CB |
3305 | #pragma GCC diagnostic push |
3306 | #pragma GCC diagnostic ignored "-Wcast-align" | |
938980ba CB |
3307 | parse_rtattr(tb, __LXC_NETNSA_MAX, NETNS_RTA(msg), len); |
3308 | if (tb[__LXC_NETNSA_NSID]) | |
3309 | return rta_getattr_s32(tb[__LXC_NETNSA_NSID]); | |
6ce39620 | 3310 | #pragma GCC diagnostic pop |
938980ba CB |
3311 | |
3312 | return -1; | |
3313 | } |