]> git.proxmox.com Git - mirror_lxc.git/blob - src/lxc/network.c
projects / mirror_lxc.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge pull request #2979 from tomponline/tp-vlan-mtu
[mirror_lxc.git] / src / lxc / network.c
1 /*
2 * lxc: linux Container library
3 *
4 * (C) Copyright IBM Corp. 2007, 2008
5 *
6 * Authors:
7 * Daniel Lezcano <daniel.lezcano at free.fr>
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
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 #ifndef _GNU_SOURCE
25 #define _GNU_SOURCE 1
26 #endif
27 #include <arpa/inet.h>
28 #include <ctype.h>
29 #include <errno.h>
30 #include <fcntl.h>
31 #include <linux/netlink.h>
32 #include <linux/rtnetlink.h>
33 #include <linux/sockios.h>
34 #include <net/ethernet.h>
35 #include <net/if.h>
36 #include <net/if_arp.h>
37 #include <netinet/in.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
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>
47 #include <time.h>
48 #include <unistd.h>
49
50 #include "../include/netns_ifaddrs.h"
51 #include "af_unix.h"
52 #include "conf.h"
53 #include "config.h"
54 #include "file_utils.h"
55 #include "log.h"
56 #include "macro.h"
57 #include "memory_utils.h"
58 #include "network.h"
59 #include "nl.h"
60 #include "raw_syscalls.h"
61 #include "syscall_wrappers.h"
62 #include "utils.h"
63
64 #ifndef HAVE_STRLCPY
65 #include "include/strlcpy.h"
66 #endif
67
68 lxc_log_define(network, lxc);
69
70 typedef int (*instantiate_cb)(struct lxc_handler *, struct lxc_netdev *);
71 static const char loDev[] = "lo";
72
73 static int lxc_ip_route_dest(__u16 nlmsg_type, int family, int ifindex, void *dest, unsigned int netmask)
74 {
75 int addrlen, err;
76 struct nl_handler nlh;
77 struct rtmsg *rt;
78 struct nlmsg *answer = NULL, *nlmsg = NULL;
79
80 addrlen = family == AF_INET ? sizeof(struct in_addr)
81 : sizeof(struct in6_addr);
82
83 err = netlink_open(&nlh, NETLINK_ROUTE);
84 if (err)
85 return err;
86
87 err = -ENOMEM;
88 nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE);
89 if (!nlmsg)
90 goto out;
91
92 answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE);
93 if (!answer)
94 goto out;
95
96 nlmsg->nlmsghdr->nlmsg_flags =
97 NLM_F_ACK | NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL;
98 nlmsg->nlmsghdr->nlmsg_type = nlmsg_type;
99
100 rt = nlmsg_reserve(nlmsg, sizeof(struct rtmsg));
101 if (!rt)
102 goto out;
103 rt->rtm_family = family;
104 rt->rtm_table = RT_TABLE_MAIN;
105 rt->rtm_scope = RT_SCOPE_LINK;
106 rt->rtm_protocol = RTPROT_BOOT;
107 rt->rtm_type = RTN_UNICAST;
108 rt->rtm_dst_len = netmask;
109
110 err = -EINVAL;
111 if (nla_put_buffer(nlmsg, RTA_DST, dest, addrlen))
112 goto out;
113 if (nla_put_u32(nlmsg, RTA_OIF, ifindex))
114 goto out;
115 err = netlink_transaction(&nlh, nlmsg, answer);
116 out:
117 netlink_close(&nlh);
118 nlmsg_free(answer);
119 nlmsg_free(nlmsg);
120 return err;
121 }
122
123 static int lxc_ipv4_dest_add(int ifindex, struct in_addr *dest, unsigned int netmask)
124 {
125 return lxc_ip_route_dest(RTM_NEWROUTE, AF_INET, ifindex, dest, netmask);
126 }
127
128 static int lxc_ipv6_dest_add(int ifindex, struct in6_addr *dest, unsigned int netmask)
129 {
130 return lxc_ip_route_dest(RTM_NEWROUTE, AF_INET6, ifindex, dest, netmask);
131 }
132
133 static int lxc_ipv4_dest_del(int ifindex, struct in_addr *dest, unsigned int netmask)
134 {
135 return lxc_ip_route_dest(RTM_DELROUTE, AF_INET, ifindex, dest, netmask);
136 }
137
138 static int lxc_ipv6_dest_del(int ifindex, struct in6_addr *dest, unsigned int netmask)
139 {
140 return lxc_ip_route_dest(RTM_DELROUTE, AF_INET6, ifindex, dest, netmask);
141 }
142
143 static int lxc_setup_ipv4_routes(struct lxc_list *ip, int ifindex)
144 {
145 struct lxc_list *iterator;
146 int err;
147
148 lxc_list_for_each(iterator, ip) {
149 struct lxc_inetdev *inetdev = iterator->elem;
150
151 err = lxc_ipv4_dest_add(ifindex, &inetdev->addr, inetdev->prefix);
152 if (err) {
153 SYSERROR("Failed to setup ipv4 route for network device "
154 "with ifindex %d", ifindex);
155 return minus_one_set_errno(-err);
156 }
157 }
158
159 return 0;
160 }
161
162 static int lxc_setup_ipv6_routes(struct lxc_list *ip, int ifindex)
163 {
164 struct lxc_list *iterator;
165 int err;
166
167 lxc_list_for_each(iterator, ip) {
168 struct lxc_inet6dev *inet6dev = iterator->elem;
169
170 err = lxc_ipv6_dest_add(ifindex, &inet6dev->addr, inet6dev->prefix);
171 if (err) {
172 SYSERROR("Failed to setup ipv6 route for network device "
173 "with ifindex %d", ifindex);
174 return minus_one_set_errno(-err);
175 }
176 }
177
178 return 0;
179 }
180
181 static int instantiate_veth(struct lxc_handler *handler, struct lxc_netdev *netdev)
182 {
183 int bridge_index, err;
184 char *veth1, *veth2;
185 char veth1buf[IFNAMSIZ], veth2buf[IFNAMSIZ];
186 unsigned int mtu = 0;
187
188 if (netdev->priv.veth_attr.pair[0] != '\0') {
189 veth1 = netdev->priv.veth_attr.pair;
190 if (handler->conf->reboot)
191 lxc_netdev_delete_by_name(veth1);
192 } else {
193 err = snprintf(veth1buf, sizeof(veth1buf), "vethXXXXXX");
194 if (err < 0 || (size_t)err >= sizeof(veth1buf))
195 return -1;
196
197 veth1 = lxc_mkifname(veth1buf);
198 if (!veth1)
199 return -1;
200
201 /* store away for deconf */
202 memcpy(netdev->priv.veth_attr.veth1, veth1, IFNAMSIZ);
203 }
204
205 err = snprintf(veth2buf, sizeof(veth2buf), "vethXXXXXX");
206 if (err < 0 || (size_t)err >= sizeof(veth2buf))
207 return -1;
208
209 veth2 = lxc_mkifname(veth2buf);
210 if (!veth2)
211 goto out_delete;
212
213 err = lxc_veth_create(veth1, veth2);
214 if (err) {
215 errno = -err;
216 SYSERROR("Failed to create veth pair \"%s\" and \"%s\"", veth1, veth2);
217 goto out_delete;
218 }
219
220 /* changing the high byte of the mac address to 0xfe, the bridge interface
221 * will always keep the host's mac address and not take the mac address
222 * of a container */
223 err = setup_private_host_hw_addr(veth1);
224 if (err) {
225 errno = -err;
226 SYSERROR("Failed to change mac address of host interface \"%s\"", veth1);
227 goto out_delete;
228 }
229
230 /* Retrieve ifindex of the host's veth device. */
231 netdev->priv.veth_attr.ifindex = if_nametoindex(veth1);
232 if (!netdev->priv.veth_attr.ifindex) {
233 ERROR("Failed to retrieve ifindex for \"%s\"", veth1);
234 goto out_delete;
235 }
236
237 /* Note that we're retrieving the container's ifindex in the host's
238 * network namespace because we need it to move the device from the
239 * host's network namespace to the container's network namespace later
240 * on.
241 */
242 netdev->ifindex = if_nametoindex(veth2);
243 if (!netdev->ifindex) {
244 ERROR("Failed to retrieve ifindex for \"%s\"", veth2);
245 goto out_delete;
246 }
247
248 if (netdev->mtu) {
249 if (lxc_safe_uint(netdev->mtu, &mtu) < 0)
250 WARN("Failed to parse mtu");
251 else
252 INFO("Retrieved mtu %d", mtu);
253 } else if (netdev->link[0] != '\0') {
254 bridge_index = if_nametoindex(netdev->link);
255 if (bridge_index) {
256 mtu = netdev_get_mtu(bridge_index);
257 INFO("Retrieved mtu %d from %s", mtu, netdev->link);
258 } else {
259 mtu = netdev_get_mtu(netdev->ifindex);
260 INFO("Retrieved mtu %d from %s", mtu, veth2);
261 }
262 }
263
264 if (mtu) {
265 err = lxc_netdev_set_mtu(veth1, mtu);
266 if (!err)
267 err = lxc_netdev_set_mtu(veth2, mtu);
268
269 if (err) {
270 errno = -err;
271 SYSERROR("Failed to set mtu \"%d\" for veth pair \"%s\" "
272 "and \"%s\"", mtu, veth1, veth2);
273 goto out_delete;
274 }
275 }
276
277 if (netdev->link[0] != '\0') {
278 err = lxc_bridge_attach(netdev->link, veth1);
279 if (err) {
280 errno = -err;
281 SYSERROR("Failed to attach \"%s\" to bridge \"%s\"",
282 veth1, netdev->link);
283 goto out_delete;
284 }
285 INFO("Attached \"%s\" to bridge \"%s\"", veth1, netdev->link);
286 }
287
288 err = lxc_netdev_up(veth1);
289 if (err) {
290 errno = -err;
291 SYSERROR("Failed to set \"%s\" up", veth1);
292 goto out_delete;
293 }
294
295 /* setup ipv4 routes on the host interface */
296 if (lxc_setup_ipv4_routes(&netdev->priv.veth_attr.ipv4_routes, netdev->priv.veth_attr.ifindex)) {
297 ERROR("Failed to setup ipv4 routes for network device \"%s\"", veth1);
298 goto out_delete;
299 }
300
301 /* setup ipv6 routes on the host interface */
302 if (lxc_setup_ipv6_routes(&netdev->priv.veth_attr.ipv6_routes, netdev->priv.veth_attr.ifindex)) {
303 ERROR("Failed to setup ipv6 routes for network device \"%s\"", veth1);
304 goto out_delete;
305 }
306
307 if (netdev->upscript) {
308 char *argv[] = {
309 "veth",
310 netdev->link,
311 veth1,
312 NULL,
313 };
314
315 err = run_script_argv(handler->name,
316 handler->conf->hooks_version, "net",
317 netdev->upscript, "up", argv);
318 if (err < 0)
319 goto out_delete;
320 }
321
322 DEBUG("Instantiated veth \"%s/%s\", index is \"%d\"", veth1, veth2,
323 netdev->ifindex);
324
325 return 0;
326
327 out_delete:
328 if (netdev->ifindex != 0)
329 lxc_netdev_delete_by_name(veth1);
330 return -1;
331 }
332
333 static int instantiate_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev)
334 {
335 char peerbuf[IFNAMSIZ], *peer;
336 int err;
337
338 if (netdev->link[0] == '\0') {
339 ERROR("No link for macvlan network device specified");
340 return -1;
341 }
342
343 err = snprintf(peerbuf, sizeof(peerbuf), "mcXXXXXX");
344 if (err < 0 || (size_t)err >= sizeof(peerbuf))
345 return -1;
346
347 peer = lxc_mkifname(peerbuf);
348 if (!peer)
349 return -1;
350
351 err = lxc_macvlan_create(netdev->link, peer,
352 netdev->priv.macvlan_attr.mode);
353 if (err) {
354 errno = -err;
355 SYSERROR("Failed to create macvlan interface \"%s\" on \"%s\"",
356 peer, netdev->link);
357 goto on_error;
358 }
359
360 netdev->ifindex = if_nametoindex(peer);
361 if (!netdev->ifindex) {
362 ERROR("Failed to retrieve ifindex for \"%s\"", peer);
363 goto on_error;
364 }
365
366 if (netdev->upscript) {
367 char *argv[] = {
368 "macvlan",
369 netdev->link,
370 NULL,
371 };
372
373 err = run_script_argv(handler->name,
374 handler->conf->hooks_version, "net",
375 netdev->upscript, "up", argv);
376 if (err < 0)
377 goto on_error;
378 }
379
380 DEBUG("Instantiated macvlan \"%s\" with ifindex is %d and mode %d",
381 peer, netdev->ifindex, netdev->priv.macvlan_attr.mode);
382
383 return 0;
384
385 on_error:
386 lxc_netdev_delete_by_name(peer);
387 return -1;
388 }
389
390 static int lxc_ipvlan_create(const char *master, const char *name, int mode, int isolation)
391 {
392 int err, index, len;
393 struct ifinfomsg *ifi;
394 struct nl_handler nlh;
395 struct rtattr *nest, *nest2;
396 struct nlmsg *answer = NULL, *nlmsg = NULL;
397
398 len = strlen(master);
399 if (len == 1 || len >= IFNAMSIZ)
400 return minus_one_set_errno(EINVAL);
401
402 len = strlen(name);
403 if (len == 1 || len >= IFNAMSIZ)
404 return minus_one_set_errno(EINVAL);
405
406 index = if_nametoindex(master);
407 if (!index)
408 return minus_one_set_errno(EINVAL);
409
410 err = netlink_open(&nlh, NETLINK_ROUTE);
411 if (err)
412 return minus_one_set_errno(-err);
413
414 err = -ENOMEM;
415 nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE);
416 if (!nlmsg)
417 goto out;
418
419 answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE);
420 if (!answer)
421 goto out;
422
423 nlmsg->nlmsghdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL | NLM_F_ACK;
424 nlmsg->nlmsghdr->nlmsg_type = RTM_NEWLINK;
425
426 ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg));
427 if (!ifi) {
428 goto out;
429 }
430 ifi->ifi_family = AF_UNSPEC;
431
432 err = -EPROTO;
433 nest = nla_begin_nested(nlmsg, IFLA_LINKINFO);
434 if (!nest)
435 goto out;
436
437 if (nla_put_string(nlmsg, IFLA_INFO_KIND, "ipvlan"))
438 goto out;
439
440 if (mode) {
441 nest2 = nla_begin_nested(nlmsg, IFLA_INFO_DATA);
442 if (!nest2)
443 goto out;
444
445 if (nla_put_u32(nlmsg, IFLA_IPVLAN_MODE, mode))
446 goto out;
447
448 /* if_link.h does not define the isolation flag value for bridge mode so we define it as 0
449 * and only send mode if mode >0 as default mode is bridge anyway according to ipvlan docs.
450 */
451 if (isolation > 0) {
452 if (nla_put_u16(nlmsg, IFLA_IPVLAN_ISOLATION, isolation))
453 goto out;
454 }
455
456 nla_end_nested(nlmsg, nest2);
457 }
458
459 nla_end_nested(nlmsg, nest);
460
461 if (nla_put_u32(nlmsg, IFLA_LINK, index))
462 goto out;
463
464 if (nla_put_string(nlmsg, IFLA_IFNAME, name))
465 goto out;
466
467 err = netlink_transaction(&nlh, nlmsg, answer);
468 out:
469 netlink_close(&nlh);
470 nlmsg_free(answer);
471 nlmsg_free(nlmsg);
472 if (err < 0)
473 return minus_one_set_errno(-err);
474 return 0;
475 }
476
477 static int instantiate_ipvlan(struct lxc_handler *handler, struct lxc_netdev *netdev)
478 {
479 char peerbuf[IFNAMSIZ], *peer;
480 int err;
481 unsigned int mtu = 0;
482
483 if (netdev->link[0] == '\0') {
484 ERROR("No link for ipvlan network device specified");
485 return -1;
486 }
487
488 err = snprintf(peerbuf, sizeof(peerbuf), "ipXXXXXX");
489 if (err < 0 || (size_t)err >= sizeof(peerbuf))
490 return -1;
491
492 peer = lxc_mkifname(peerbuf);
493 if (!peer)
494 return -1;
495
496 err = lxc_ipvlan_create(netdev->link, peer, netdev->priv.ipvlan_attr.mode, netdev->priv.ipvlan_attr.isolation);
497 if (err) {
498 SYSERROR("Failed to create ipvlan interface \"%s\" on \"%s\"", peer, netdev->link);
499 goto on_error;
500 }
501
502 netdev->ifindex = if_nametoindex(peer);
503 if (!netdev->ifindex) {
504 ERROR("Failed to retrieve ifindex for \"%s\"", peer);
505 goto on_error;
506 }
507
508 if (netdev->mtu) {
509 err = lxc_safe_uint(netdev->mtu, &mtu);
510 if (err < 0) {
511 errno = -err;
512 SYSERROR("Failed to parse mtu \"%s\" for interface \"%s\"", netdev->mtu, peer);
513 goto on_error;
514 }
515
516 err = lxc_netdev_set_mtu(peer, mtu);
517 if (err < 0) {
518 errno = -err;
519 SYSERROR("Failed to set mtu \"%s\" for interface \"%s\"", netdev->mtu, peer);
520 goto on_error;
521 }
522 }
523
524 if (netdev->upscript) {
525 char *argv[] = {
526 "ipvlan",
527 netdev->link,
528 NULL,
529 };
530
531 err = run_script_argv(handler->name,
532 handler->conf->hooks_version, "net",
533 netdev->upscript, "up", argv);
534 if (err < 0)
535 goto on_error;
536 }
537
538 DEBUG("Instantiated ipvlan \"%s\" with ifindex is %d and mode %d",
539 peer, netdev->ifindex, netdev->priv.macvlan_attr.mode);
540
541 return 0;
542
543 on_error:
544 lxc_netdev_delete_by_name(peer);
545 return -1;
546 }
547
548 static int instantiate_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev)
549 {
550 char peer[IFNAMSIZ];
551 int err;
552 static uint16_t vlan_cntr = 0;
553 unsigned int mtu = 0;
554
555 if (netdev->link[0] == '\0') {
556 ERROR("No link for vlan network device specified");
557 return -1;
558 }
559
560 err = snprintf(peer, sizeof(peer), "vlan%d-%d", netdev->priv.vlan_attr.vid, vlan_cntr++);
561 if (err < 0 || (size_t)err >= sizeof(peer))
562 return -1;
563
564 err = lxc_vlan_create(netdev->link, peer, netdev->priv.vlan_attr.vid);
565 if (err) {
566 errno = -err;
567 SYSERROR("Failed to create vlan interface \"%s\" on \"%s\"",
568 peer, netdev->link);
569 return -1;
570 }
571
572 netdev->ifindex = if_nametoindex(peer);
573 if (!netdev->ifindex) {
574 ERROR("Failed to retrieve ifindex for \"%s\"", peer);
575 goto on_error;
576 }
577
578 if (netdev->mtu) {
579 err = lxc_safe_uint(netdev->mtu, &mtu);
580 if (err < 0) {
581 errno = -err;
582 SYSERROR("Failed to parse mtu \"%s\" for interface \"%s\"", netdev->mtu, peer);
583 goto on_error;
584 }
585
586 err = lxc_netdev_set_mtu(peer, mtu);
587 if (err) {
588 errno = -err;
589 SYSERROR("Failed to set mtu \"%s\" for interface \"%s\"", netdev->mtu, peer);
590 goto on_error;
591 }
592 }
593
594 if (netdev->upscript) {
595 char *argv[] = {
596 "vlan",
597 netdev->link,
598 NULL,
599 };
600
601 err = run_script_argv(handler->name,
602 handler->conf->hooks_version, "net",
603 netdev->upscript, "up", argv);
604 if (err < 0) {
605 goto on_error;
606 }
607 }
608
609 DEBUG("Instantiated vlan \"%s\" with ifindex is \"%d\" (vlan1000)",
610 peer, netdev->ifindex);
611
612 return 0;
613
614 on_error:
615 lxc_netdev_delete_by_name(peer);
616 return -1;
617 }
618
619 static int instantiate_phys(struct lxc_handler *handler, struct lxc_netdev *netdev)
620 {
621 int ret;
622 char *argv[] = {
623 "phys",
624 netdev->link,
625 NULL,
626 };
627
628 if (netdev->link[0] == '\0') {
629 ERROR("No link for physical interface specified");
630 return -1;
631 }
632
633 /* Note that we're retrieving the container's ifindex in the host's
634 * network namespace because we need it to move the device from the
635 * host's network namespace to the container's network namespace later
636 * on.
637 * Note that netdev->link will contain the name of the physical network
638 * device in the host's namespace.
639 */
640 netdev->ifindex = if_nametoindex(netdev->link);
641 if (!netdev->ifindex) {
642 ERROR("Failed to retrieve ifindex for \"%s\"", netdev->link);
643 return -1;
644 }
645
646 /* Store the ifindex of the host's network device in the host's
647 * namespace.
648 */
649 netdev->priv.phys_attr.ifindex = netdev->ifindex;
650
651 if (!netdev->upscript)
652 return 0;
653
654 ret = run_script_argv(handler->name, handler->conf->hooks_version,
655 "net", netdev->upscript, "up", argv);
656 if (ret < 0)
657 return -1;
658
659 return 0;
660 }
661
662 static int instantiate_empty(struct lxc_handler *handler, struct lxc_netdev *netdev)
663 {
664 int ret;
665 char *argv[] = {
666 "empty",
667 NULL,
668 };
669
670 netdev->ifindex = 0;
671 if (!netdev->upscript)
672 return 0;
673
674 ret = run_script_argv(handler->name, handler->conf->hooks_version,
675 "net", netdev->upscript, "up", argv);
676 if (ret < 0)
677 return -1;
678
679 return 0;
680 }
681
682 static int instantiate_none(struct lxc_handler *handler, struct lxc_netdev *netdev)
683 {
684 netdev->ifindex = 0;
685 return 0;
686 }
687
688 static instantiate_cb netdev_conf[LXC_NET_MAXCONFTYPE + 1] = {
689 [LXC_NET_VETH] = instantiate_veth,
690 [LXC_NET_MACVLAN] = instantiate_macvlan,
691 [LXC_NET_IPVLAN] = instantiate_ipvlan,
692 [LXC_NET_VLAN] = instantiate_vlan,
693 [LXC_NET_PHYS] = instantiate_phys,
694 [LXC_NET_EMPTY] = instantiate_empty,
695 [LXC_NET_NONE] = instantiate_none,
696 };
697
698 static int shutdown_veth(struct lxc_handler *handler, struct lxc_netdev *netdev)
699 {
700 int ret;
701 char *argv[] = {
702 "veth",
703 netdev->link,
704 NULL,
705 NULL,
706 };
707
708 if (!netdev->downscript)
709 return 0;
710
711 if (netdev->priv.veth_attr.pair[0] != '\0')
712 argv[2] = netdev->priv.veth_attr.pair;
713 else
714 argv[2] = netdev->priv.veth_attr.veth1;
715
716 ret = run_script_argv(handler->name,
717 handler->conf->hooks_version, "net",
718 netdev->downscript, "down", argv);
719 if (ret < 0)
720 return -1;
721
722 return 0;
723 }
724
725 static int shutdown_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev)
726 {
727 int ret;
728 char *argv[] = {
729 "macvlan",
730 netdev->link,
731 NULL,
732 };
733
734 if (!netdev->downscript)
735 return 0;
736
737 ret = run_script_argv(handler->name, handler->conf->hooks_version,
738 "net", netdev->downscript, "down", argv);
739 if (ret < 0)
740 return -1;
741
742 return 0;
743 }
744
745 static int shutdown_ipvlan(struct lxc_handler *handler, struct lxc_netdev *netdev)
746 {
747 int ret;
748 char *argv[] = {
749 "ipvlan",
750 netdev->link,
751 NULL,
752 };
753
754 if (!netdev->downscript)
755 return 0;
756
757 ret = run_script_argv(handler->name, handler->conf->hooks_version,
758 "net", netdev->downscript, "down", argv);
759 if (ret < 0)
760 return -1;
761
762 return 0;
763 }
764
765 static int shutdown_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev)
766 {
767 int ret;
768 char *argv[] = {
769 "vlan",
770 netdev->link,
771 NULL,
772 };
773
774 if (!netdev->downscript)
775 return 0;
776
777 ret = run_script_argv(handler->name, handler->conf->hooks_version,
778 "net", netdev->downscript, "down", argv);
779 if (ret < 0)
780 return -1;
781
782 return 0;
783 }
784
785 static int shutdown_phys(struct lxc_handler *handler, struct lxc_netdev *netdev)
786 {
787 int ret;
788 char *argv[] = {
789 "phys",
790 netdev->link,
791 NULL,
792 };
793
794 if (!netdev->downscript)
795 return 0;
796
797 ret = run_script_argv(handler->name, handler->conf->hooks_version,
798 "net", netdev->downscript, "down", argv);
799 if (ret < 0)
800 return -1;
801
802 return 0;
803 }
804
805 static int shutdown_empty(struct lxc_handler *handler, struct lxc_netdev *netdev)
806 {
807 int ret;
808 char *argv[] = {
809 "empty",
810 NULL,
811 };
812
813 if (!netdev->downscript)
814 return 0;
815
816 ret = run_script_argv(handler->name, handler->conf->hooks_version,
817 "net", netdev->downscript, "down", argv);
818 if (ret < 0)
819 return -1;
820
821 return 0;
822 }
823
824 static int shutdown_none(struct lxc_handler *handler, struct lxc_netdev *netdev)
825 {
826 return 0;
827 }
828
829 static instantiate_cb netdev_deconf[LXC_NET_MAXCONFTYPE + 1] = {
830 [LXC_NET_VETH] = shutdown_veth,
831 [LXC_NET_MACVLAN] = shutdown_macvlan,
832 [LXC_NET_IPVLAN] = shutdown_ipvlan,
833 [LXC_NET_VLAN] = shutdown_vlan,
834 [LXC_NET_PHYS] = shutdown_phys,
835 [LXC_NET_EMPTY] = shutdown_empty,
836 [LXC_NET_NONE] = shutdown_none,
837 };
838
839 int lxc_netdev_move_by_index(int ifindex, pid_t pid, const char *ifname)
840 {
841 int err;
842 struct nl_handler nlh;
843 struct ifinfomsg *ifi;
844 struct nlmsg *nlmsg = NULL;
845
846 err = netlink_open(&nlh, NETLINK_ROUTE);
847 if (err)
848 return err;
849
850 err = -ENOMEM;
851 nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE);
852 if (!nlmsg)
853 goto out;
854
855 nlmsg->nlmsghdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
856 nlmsg->nlmsghdr->nlmsg_type = RTM_NEWLINK;
857
858 ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg));
859 if (!ifi)
860 goto out;
861 ifi->ifi_family = AF_UNSPEC;
862 ifi->ifi_index = ifindex;
863
864 if (nla_put_u32(nlmsg, IFLA_NET_NS_PID, pid))
865 goto out;
866
867 if (ifname != NULL) {
868 if (nla_put_string(nlmsg, IFLA_IFNAME, ifname))
869 goto out;
870 }
871
872 err = netlink_transaction(&nlh, nlmsg, nlmsg);
873 out:
874 netlink_close(&nlh);
875 nlmsg_free(nlmsg);
876 return err;
877 }
878
879 /* If we are asked to move a wireless interface, then we must actually move its
880 * phyN device. Detect that condition and return the physname here. The physname
881 * will be passed to lxc_netdev_move_wlan() which will free it when done.
882 */
883 #define PHYSNAME "/sys/class/net/%s/phy80211/name"
884 static char *is_wlan(const char *ifname)
885 {
886 __do_free char *path = NULL;
887 int i, ret;
888 long physlen;
889 size_t len;
890 FILE *f;
891 char *physname = NULL;
892
893 len = strlen(ifname) + strlen(PHYSNAME) - 1;
894 path = must_realloc(NULL, len + 1);
895 ret = snprintf(path, len, PHYSNAME, ifname);
896 if (ret < 0 || (size_t)ret >= len)
897 goto bad;
898
899 f = fopen(path, "r");
900 if (!f)
901 goto bad;
902
903 /* Feh - sb.st_size is always 4096. */
904 fseek(f, 0, SEEK_END);
905 physlen = ftell(f);
906 fseek(f, 0, SEEK_SET);
907 if (physlen < 0) {
908 fclose(f);
909 goto bad;
910 }
911
912 physname = malloc(physlen + 1);
913 if (!physname) {
914 fclose(f);
915 goto bad;
916 }
917
918 memset(physname, 0, physlen + 1);
919 ret = fread(physname, 1, physlen, f);
920 fclose(f);
921 if (ret < 0)
922 goto bad;
923
924 for (i = 0; i < physlen; i++) {
925 if (physname[i] == '\n')
926 physname[i] = '\0';
927
928 if (physname[i] == '\0')
929 break;
930 }
931
932 return physname;
933
934 bad:
935 free(physname);
936 return NULL;
937 }
938
939 static int lxc_netdev_rename_by_name_in_netns(pid_t pid, const char *old,
940 const char *new)
941 {
942 pid_t fpid;
943
944 fpid = fork();
945 if (fpid < 0)
946 return -1;
947
948 if (fpid != 0)
949 return wait_for_pid(fpid);
950
951 if (!switch_to_ns(pid, "net"))
952 return -1;
953
954 _exit(lxc_netdev_rename_by_name(old, new));
955 }
956
957 static int lxc_netdev_move_wlan(char *physname, const char *ifname, pid_t pid,
958 const char *newname)
959 {
960 char *cmd;
961 pid_t fpid;
962 int err = -1;
963
964 /* Move phyN into the container. TODO - do this using netlink.
965 * However, IIUC this involves a bit more complicated work to talk to
966 * the 80211 module, so for now just call out to iw.
967 */
968 cmd = on_path("iw", NULL);
969 if (!cmd)
970 goto out1;
971 free(cmd);
972
973 fpid = fork();
974 if (fpid < 0)
975 goto out1;
976
977 if (fpid == 0) {
978 char pidstr[30];
979 sprintf(pidstr, "%d", pid);
980 execlp("iw", "iw", "phy", physname, "set", "netns", pidstr,
981 (char *)NULL);
982 _exit(EXIT_FAILURE);
983 }
984
985 if (wait_for_pid(fpid))
986 goto out1;
987
988 err = 0;
989 if (newname)
990 err = lxc_netdev_rename_by_name_in_netns(pid, ifname, newname);
991
992 out1:
993 free(physname);
994 return err;
995 }
996
997 int lxc_netdev_move_by_name(const char *ifname, pid_t pid, const char* newname)
998 {
999 int index;
1000 char *physname;
1001
1002 if (!ifname)
1003 return -EINVAL;
1004
1005 index = if_nametoindex(ifname);
1006 if (!index)
1007 return -EINVAL;
1008
1009 physname = is_wlan(ifname);
1010 if (physname)
1011 return lxc_netdev_move_wlan(physname, ifname, pid, newname);
1012
1013 return lxc_netdev_move_by_index(index, pid, newname);
1014 }
1015
1016 int lxc_netdev_delete_by_index(int ifindex)
1017 {
1018 int err;
1019 struct ifinfomsg *ifi;
1020 struct nl_handler nlh;
1021 struct nlmsg *answer = NULL, *nlmsg = NULL;
1022
1023 err = netlink_open(&nlh, NETLINK_ROUTE);
1024 if (err)
1025 return err;
1026
1027 err = -ENOMEM;
1028 nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE);
1029 if (!nlmsg)
1030 goto out;
1031
1032 answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE);
1033 if (!answer)
1034 goto out;
1035
1036 nlmsg->nlmsghdr->nlmsg_flags = NLM_F_ACK | NLM_F_REQUEST;
1037 nlmsg->nlmsghdr->nlmsg_type = RTM_DELLINK;
1038
1039 ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg));
1040 if (!ifi)
1041 goto out;
1042 ifi->ifi_family = AF_UNSPEC;
1043 ifi->ifi_index = ifindex;
1044
1045 err = netlink_transaction(&nlh, nlmsg, answer);
1046 out:
1047 netlink_close(&nlh);
1048 nlmsg_free(answer);
1049 nlmsg_free(nlmsg);
1050 return err;
1051 }
1052
1053 int lxc_netdev_delete_by_name(const char *name)
1054 {
1055 int index;
1056
1057 index = if_nametoindex(name);
1058 if (!index)
1059 return -EINVAL;
1060
1061 return lxc_netdev_delete_by_index(index);
1062 }
1063
1064 int lxc_netdev_rename_by_index(int ifindex, const char *newname)
1065 {
1066 int err, len;
1067 struct ifinfomsg *ifi;
1068 struct nl_handler nlh;
1069 struct nlmsg *answer = NULL, *nlmsg = NULL;
1070
1071 err = netlink_open(&nlh, NETLINK_ROUTE);
1072 if (err)
1073 return err;
1074
1075 len = strlen(newname);
1076 if (len == 1 || len >= IFNAMSIZ)
1077 goto out;
1078
1079 err = -ENOMEM;
1080 nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE);
1081 if (!nlmsg)
1082 goto out;
1083
1084 answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE);
1085 if (!answer)
1086 goto out;
1087
1088 nlmsg->nlmsghdr->nlmsg_flags = NLM_F_ACK | NLM_F_REQUEST;
1089 nlmsg->nlmsghdr->nlmsg_type = RTM_NEWLINK;
1090
1091 ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg));
1092 if (!ifi)
1093 goto out;
1094 ifi->ifi_family = AF_UNSPEC;
1095 ifi->ifi_index = ifindex;
1096
1097 if (nla_put_string(nlmsg, IFLA_IFNAME, newname))
1098 goto out;
1099
1100 err = netlink_transaction(&nlh, nlmsg, answer);
1101 out:
1102 netlink_close(&nlh);
1103 nlmsg_free(answer);
1104 nlmsg_free(nlmsg);
1105 return err;
1106 }
1107
1108 int lxc_netdev_rename_by_name(const char *oldname, const char *newname)
1109 {
1110 int len, index;
1111
1112 len = strlen(oldname);
1113 if (len == 1 || len >= IFNAMSIZ)
1114 return -EINVAL;
1115
1116 index = if_nametoindex(oldname);
1117 if (!index)
1118 return -EINVAL;
1119
1120 return lxc_netdev_rename_by_index(index, newname);
1121 }
1122
1123 int netdev_set_flag(const char *name, int flag)
1124 {
1125 int err, index, len;
1126 struct ifinfomsg *ifi;
1127 struct nl_handler nlh;
1128 struct nlmsg *answer = NULL, *nlmsg = NULL;
1129
1130 err = netlink_open(&nlh, NETLINK_ROUTE);
1131 if (err)
1132 return err;
1133
1134 err = -EINVAL;
1135 len = strlen(name);
1136 if (len == 1 || len >= IFNAMSIZ)
1137 goto out;
1138
1139 err = -ENOMEM;
1140 nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE);
1141 if (!nlmsg)
1142 goto out;
1143
1144 answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE);
1145 if (!answer)
1146 goto out;
1147
1148 err = -EINVAL;
1149 index = if_nametoindex(name);
1150 if (!index)
1151 goto out;
1152
1153 nlmsg->nlmsghdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
1154 nlmsg->nlmsghdr->nlmsg_type = RTM_NEWLINK;
1155
1156 ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg));
1157 if (!ifi) {
1158 err = -ENOMEM;
1159 goto out;
1160 }
1161 ifi->ifi_family = AF_UNSPEC;
1162 ifi->ifi_index = index;
1163 ifi->ifi_change |= IFF_UP;
1164 ifi->ifi_flags |= flag;
1165
1166 err = netlink_transaction(&nlh, nlmsg, answer);
1167 out:
1168 netlink_close(&nlh);
1169 nlmsg_free(nlmsg);
1170 nlmsg_free(answer);
1171 return err;
1172 }
1173
1174 int netdev_get_flag(const char *name, int *flag)
1175 {
1176 int err, index, len;
1177 struct ifinfomsg *ifi;
1178 struct nl_handler nlh;
1179 struct nlmsg *answer = NULL, *nlmsg = NULL;
1180
1181 if (!name)
1182 return -EINVAL;
1183
1184 err = netlink_open(&nlh, NETLINK_ROUTE);
1185 if (err)
1186 return err;
1187
1188 err = -EINVAL;
1189 len = strlen(name);
1190 if (len == 1 || len >= IFNAMSIZ)
1191 goto out;
1192
1193 err = -ENOMEM;
1194 nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE);
1195 if (!nlmsg)
1196 goto out;
1197
1198 answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE);
1199 if (!answer)
1200 goto out;
1201
1202 err = -EINVAL;
1203 index = if_nametoindex(name);
1204 if (!index)
1205 goto out;
1206
1207 nlmsg->nlmsghdr->nlmsg_flags = NLM_F_REQUEST;
1208 nlmsg->nlmsghdr->nlmsg_type = RTM_GETLINK;
1209
1210 ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg));
1211 if (!ifi) {
1212 err = -ENOMEM;
1213 goto out;
1214 }
1215 ifi->ifi_family = AF_UNSPEC;
1216 ifi->ifi_index = index;
1217
1218 err = netlink_transaction(&nlh, nlmsg, answer);
1219 if (err)
1220 goto out;
1221
1222 ifi = NLMSG_DATA(answer->nlmsghdr);
1223
1224 *flag = ifi->ifi_flags;
1225 out:
1226 netlink_close(&nlh);
1227 nlmsg_free(nlmsg);
1228 nlmsg_free(answer);
1229 return err;
1230 }
1231
1232 /*
1233 * \brief Check a interface is up or not.
1234 *
1235 * \param name: name for the interface.
1236 *
1237 * \return int.
1238 * 0 means interface is down.
1239 * 1 means interface is up.
1240 * Others means error happened, and ret-value is the error number.
1241 */
1242 int lxc_netdev_isup(const char *name)
1243 {
1244 int err, flag;
1245
1246 err = netdev_get_flag(name, &flag);
1247 if (err)
1248 return err;
1249
1250 if (flag & IFF_UP)
1251 return 1;
1252
1253 return 0;
1254 }
1255
1256 int netdev_get_mtu(int ifindex)
1257 {
1258 int answer_len, err, res;
1259 struct nl_handler nlh;
1260 struct ifinfomsg *ifi;
1261 struct nlmsghdr *msg;
1262 int readmore = 0, recv_len = 0;
1263 struct nlmsg *answer = NULL, *nlmsg = NULL;
1264
1265 err = netlink_open(&nlh, NETLINK_ROUTE);
1266 if (err)
1267 return err;
1268
1269 err = -ENOMEM;
1270 nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE);
1271 if (!nlmsg)
1272 goto out;
1273
1274 answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE);
1275 if (!answer)
1276 goto out;
1277
1278 /* Save the answer buffer length, since it will be overwritten
1279 * on the first receive (and we might need to receive more than
1280 * once.
1281 */
1282 answer_len = answer->nlmsghdr->nlmsg_len;
1283
1284 nlmsg->nlmsghdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
1285 nlmsg->nlmsghdr->nlmsg_type = RTM_GETLINK;
1286
1287 ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg));
1288 if (!ifi)
1289 goto out;
1290 ifi->ifi_family = AF_UNSPEC;
1291
1292 /* Send the request for addresses, which returns all addresses
1293 * on all interfaces. */
1294 err = netlink_send(&nlh, nlmsg);
1295 if (err < 0)
1296 goto out;
1297
1298 #pragma GCC diagnostic push
1299 #pragma GCC diagnostic ignored "-Wcast-align"
1300
1301 do {
1302 /* Restore the answer buffer length, it might have been
1303 * overwritten by a previous receive.
1304 */
1305 answer->nlmsghdr->nlmsg_len = answer_len;
1306
1307 /* Get the (next) batch of reply messages */
1308 err = netlink_rcv(&nlh, answer);
1309 if (err < 0)
1310 goto out;
1311
1312 recv_len = err;
1313
1314 /* Satisfy the typing for the netlink macros */
1315 msg = answer->nlmsghdr;
1316
1317 while (NLMSG_OK(msg, recv_len)) {
1318
1319 /* Stop reading if we see an error message */
1320 if (msg->nlmsg_type == NLMSG_ERROR) {
1321 struct nlmsgerr *errmsg =
1322 (struct nlmsgerr *)NLMSG_DATA(msg);
1323 err = errmsg->error;
1324 goto out;
1325 }
1326
1327 /* Stop reading if we see a NLMSG_DONE message */
1328 if (msg->nlmsg_type == NLMSG_DONE) {
1329 readmore = 0;
1330 break;
1331 }
1332
1333 ifi = NLMSG_DATA(msg);
1334 if (ifi->ifi_index == ifindex) {
1335 struct rtattr *rta = IFLA_RTA(ifi);
1336 int attr_len =
1337 msg->nlmsg_len - NLMSG_LENGTH(sizeof(*ifi));
1338 res = 0;
1339 while (RTA_OK(rta, attr_len)) {
1340 /* Found a local address for the
1341 * requested interface, return it.
1342 */
1343 if (rta->rta_type == IFLA_MTU) {
1344 memcpy(&res, RTA_DATA(rta),
1345 sizeof(int));
1346 err = res;
1347 goto out;
1348 }
1349 rta = RTA_NEXT(rta, attr_len);
1350 }
1351 }
1352
1353 /* Keep reading more data from the socket if the last
1354 * message had the NLF_F_MULTI flag set.
1355 */
1356 readmore = (msg->nlmsg_flags & NLM_F_MULTI);
1357
1358 /* Look at the next message received in this buffer. */
1359 msg = NLMSG_NEXT(msg, recv_len);
1360 }
1361 } while (readmore);
1362
1363 #pragma GCC diagnostic pop
1364
1365 /* If we end up here, we didn't find any result, so signal an error. */
1366 err = -1;
1367
1368 out:
1369 netlink_close(&nlh);
1370 nlmsg_free(answer);
1371 nlmsg_free(nlmsg);
1372 return err;
1373 }
1374
1375 int lxc_netdev_set_mtu(const char *name, int mtu)
1376 {
1377 int err, index, len;
1378 struct ifinfomsg *ifi;
1379 struct nl_handler nlh;
1380 struct nlmsg *answer = NULL, *nlmsg = NULL;
1381
1382 err = netlink_open(&nlh, NETLINK_ROUTE);
1383 if (err)
1384 return err;
1385
1386 err = -EINVAL;
1387 len = strlen(name);
1388 if (len == 1 || len >= IFNAMSIZ)
1389 goto out;
1390
1391 err = -ENOMEM;
1392 nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE);
1393 if (!nlmsg)
1394 goto out;
1395
1396 answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE);
1397 if (!answer)
1398 goto out;
1399
1400 err = -EINVAL;
1401 index = if_nametoindex(name);
1402 if (!index)
1403 goto out;
1404
1405 nlmsg->nlmsghdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
1406 nlmsg->nlmsghdr->nlmsg_type = RTM_NEWLINK;
1407
1408 ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg));
1409 if (!ifi) {
1410 err = -ENOMEM;
1411 goto out;
1412 }
1413 ifi->ifi_family = AF_UNSPEC;
1414 ifi->ifi_index = index;
1415
1416 if (nla_put_u32(nlmsg, IFLA_MTU, mtu))
1417 goto out;
1418
1419 err = netlink_transaction(&nlh, nlmsg, answer);
1420 out:
1421 netlink_close(&nlh);
1422 nlmsg_free(nlmsg);
1423 nlmsg_free(answer);
1424 return err;
1425 }
1426
1427 int lxc_netdev_up(const char *name)
1428 {
1429 return netdev_set_flag(name, IFF_UP);
1430 }
1431
1432 int lxc_netdev_down(const char *name)
1433 {
1434 return netdev_set_flag(name, 0);
1435 }
1436
1437 int lxc_veth_create(const char *name1, const char *name2)
1438 {
1439 int err, len;
1440 struct ifinfomsg *ifi;
1441 struct nl_handler nlh;
1442 struct rtattr *nest1, *nest2, *nest3;
1443 struct nlmsg *answer = NULL, *nlmsg = NULL;
1444
1445 err = netlink_open(&nlh, NETLINK_ROUTE);
1446 if (err)
1447 return err;
1448
1449 err = -EINVAL;
1450 len = strlen(name1);
1451 if (len == 1 || len >= IFNAMSIZ)
1452 goto out;
1453
1454 len = strlen(name2);
1455 if (len == 1 || len >= IFNAMSIZ)
1456 goto out;
1457
1458 err = -ENOMEM;
1459 nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE);
1460 if (!nlmsg)
1461 goto out;
1462
1463 answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE);
1464 if (!answer)
1465 goto out;
1466
1467 nlmsg->nlmsghdr->nlmsg_flags =
1468 NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL | NLM_F_ACK;
1469 nlmsg->nlmsghdr->nlmsg_type = RTM_NEWLINK;
1470
1471 ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg));
1472 if (!ifi)
1473 goto out;
1474 ifi->ifi_family = AF_UNSPEC;
1475
1476 err = -EINVAL;
1477 nest1 = nla_begin_nested(nlmsg, IFLA_LINKINFO);
1478 if (!nest1)
1479 goto out;
1480
1481 if (nla_put_string(nlmsg, IFLA_INFO_KIND, "veth"))
1482 goto out;
1483
1484 nest2 = nla_begin_nested(nlmsg, IFLA_INFO_DATA);
1485 if (!nest2)
1486 goto out;
1487
1488 nest3 = nla_begin_nested(nlmsg, VETH_INFO_PEER);
1489 if (!nest3)
1490 goto out;
1491
1492 ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg));
1493 if (!ifi) {
1494 err = -ENOMEM;
1495 goto out;
1496 }
1497
1498 if (nla_put_string(nlmsg, IFLA_IFNAME, name2))
1499 goto out;
1500
1501 nla_end_nested(nlmsg, nest3);
1502 nla_end_nested(nlmsg, nest2);
1503 nla_end_nested(nlmsg, nest1);
1504
1505 if (nla_put_string(nlmsg, IFLA_IFNAME, name1))
1506 goto out;
1507
1508 err = netlink_transaction(&nlh, nlmsg, answer);
1509 out:
1510 netlink_close(&nlh);
1511 nlmsg_free(answer);
1512 nlmsg_free(nlmsg);
1513 return err;
1514 }
1515
1516 /* TODO: merge with lxc_macvlan_create */
1517 int lxc_vlan_create(const char *master, const char *name, unsigned short vlanid)
1518 {
1519 int err, len, lindex;
1520 struct ifinfomsg *ifi;
1521 struct nl_handler nlh;
1522 struct rtattr *nest, *nest2;
1523 struct nlmsg *answer = NULL, *nlmsg = NULL;
1524
1525 err = netlink_open(&nlh, NETLINK_ROUTE);
1526 if (err)
1527 return err;
1528
1529 err = -EINVAL;
1530 len = strlen(master);
1531 if (len == 1 || len >= IFNAMSIZ)
1532 goto err3;
1533
1534 len = strlen(name);
1535 if (len == 1 || len >= IFNAMSIZ)
1536 goto err3;
1537
1538 err = -ENOMEM;
1539 nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE);
1540 if (!nlmsg)
1541 goto err3;
1542
1543 answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE);
1544 if (!answer)
1545 goto err2;
1546
1547 err = -EINVAL;
1548 lindex = if_nametoindex(master);
1549 if (!lindex)
1550 goto err1;
1551
1552 nlmsg->nlmsghdr->nlmsg_flags =
1553 NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL | NLM_F_ACK;
1554 nlmsg->nlmsghdr->nlmsg_type = RTM_NEWLINK;
1555
1556 ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg));
1557 if (!ifi) {
1558 err = -ENOMEM;
1559 goto err1;
1560 }
1561 ifi->ifi_family = AF_UNSPEC;
1562
1563 nest = nla_begin_nested(nlmsg, IFLA_LINKINFO);
1564 if (!nest)
1565 goto err1;
1566
1567 if (nla_put_string(nlmsg, IFLA_INFO_KIND, "vlan"))
1568 goto err1;
1569
1570 nest2 = nla_begin_nested(nlmsg, IFLA_INFO_DATA);
1571 if (!nest2)
1572 goto err1;
1573
1574 if (nla_put_u16(nlmsg, IFLA_VLAN_ID, vlanid))
1575 goto err1;
1576
1577 nla_end_nested(nlmsg, nest2);
1578 nla_end_nested(nlmsg, nest);
1579
1580 if (nla_put_u32(nlmsg, IFLA_LINK, lindex))
1581 goto err1;
1582
1583 if (nla_put_string(nlmsg, IFLA_IFNAME, name))
1584 goto err1;
1585
1586 err = netlink_transaction(&nlh, nlmsg, answer);
1587 err1:
1588 nlmsg_free(answer);
1589 err2:
1590 nlmsg_free(nlmsg);
1591 err3:
1592 netlink_close(&nlh);
1593 return err;
1594 }
1595
1596 int lxc_macvlan_create(const char *master, const char *name, int mode)
1597 {
1598 int err, index, len;
1599 struct ifinfomsg *ifi;
1600 struct nl_handler nlh;
1601 struct rtattr *nest, *nest2;
1602 struct nlmsg *answer = NULL, *nlmsg = NULL;
1603
1604 err = netlink_open(&nlh, NETLINK_ROUTE);
1605 if (err)
1606 return err;
1607
1608 err = -EINVAL;
1609 len = strlen(master);
1610 if (len == 1 || len >= IFNAMSIZ)
1611 goto out;
1612
1613 len = strlen(name);
1614 if (len == 1 || len >= IFNAMSIZ)
1615 goto out;
1616
1617 err = -ENOMEM;
1618 nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE);
1619 if (!nlmsg)
1620 goto out;
1621
1622 answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE);
1623 if (!answer)
1624 goto out;
1625
1626 err = -EINVAL;
1627 index = if_nametoindex(master);
1628 if (!index)
1629 goto out;
1630
1631 nlmsg->nlmsghdr->nlmsg_flags =
1632 NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL | NLM_F_ACK;
1633 nlmsg->nlmsghdr->nlmsg_type = RTM_NEWLINK;
1634
1635 ifi = nlmsg_reserve(nlmsg, sizeof(struct ifinfomsg));
1636 if (!ifi) {
1637 err = -ENOMEM;
1638 goto out;
1639 }
1640 ifi->ifi_family = AF_UNSPEC;
1641
1642 nest = nla_begin_nested(nlmsg, IFLA_LINKINFO);
1643 if (!nest)
1644 goto out;
1645
1646 if (nla_put_string(nlmsg, IFLA_INFO_KIND, "macvlan"))
1647 goto out;
1648
1649 if (mode) {
1650 nest2 = nla_begin_nested(nlmsg, IFLA_INFO_DATA);
1651 if (!nest2)
1652 goto out;
1653
1654 if (nla_put_u32(nlmsg, IFLA_MACVLAN_MODE, mode))
1655 goto out;
1656
1657 nla_end_nested(nlmsg, nest2);
1658 }
1659
1660 nla_end_nested(nlmsg, nest);
1661
1662 if (nla_put_u32(nlmsg, IFLA_LINK, index))
1663 goto out;
1664
1665 if (nla_put_string(nlmsg, IFLA_IFNAME, name))
1666 goto out;
1667
1668 err = netlink_transaction(&nlh, nlmsg, answer);
1669 out:
1670 netlink_close(&nlh);
1671 nlmsg_free(answer);
1672 nlmsg_free(nlmsg);
1673 return err;
1674 }
1675
1676 static int proc_sys_net_write(const char *path, const char *value)
1677 {
1678 int fd;
1679 int err = 0;
1680
1681 fd = open(path, O_WRONLY);
1682 if (fd < 0)
1683 return -errno;
1684
1685 if (lxc_write_nointr(fd, value, strlen(value)) < 0)
1686 err = -errno;
1687
1688 close(fd);
1689 return err;
1690 }
1691
1692 static int lxc_is_ip_forwarding_enabled(const char *ifname, int family)
1693 {
1694 int ret;
1695 char path[PATH_MAX];
1696 char buf[1] = "";
1697
1698 if (family != AF_INET && family != AF_INET6)
1699 return minus_one_set_errno(EINVAL);
1700
1701 ret = snprintf(path, PATH_MAX, "/proc/sys/net/%s/conf/%s/%s",
1702 family == AF_INET ? "ipv4" : "ipv6", ifname,
1703 "forwarding");
1704 if (ret < 0 || (size_t)ret >= PATH_MAX)
1705 return minus_one_set_errno(E2BIG);
1706
1707 return lxc_read_file_expect(path, buf, 1, "1");
1708 }
1709
1710 static int neigh_proxy_set(const char *ifname, int family, int flag)
1711 {
1712 int ret;
1713 char path[PATH_MAX];
1714
1715 if (family != AF_INET && family != AF_INET6)
1716 return -EINVAL;
1717
1718 ret = snprintf(path, PATH_MAX, "/proc/sys/net/%s/conf/%s/%s",
1719 family == AF_INET ? "ipv4" : "ipv6", ifname,
1720 family == AF_INET ? "proxy_arp" : "proxy_ndp");
1721 if (ret < 0 || (size_t)ret >= PATH_MAX)
1722 return -E2BIG;
1723
1724 return proc_sys_net_write(path, flag ? "1" : "0");
1725 }
1726
1727 static int lxc_is_ip_neigh_proxy_enabled(const char *ifname, int family)
1728 {
1729 int ret;
1730 char path[PATH_MAX];
1731 char buf[1] = "";
1732
1733 if (family != AF_INET && family != AF_INET6)
1734 return minus_one_set_errno(EINVAL);
1735
1736 ret = snprintf(path, PATH_MAX, "/proc/sys/net/%s/conf/%s/%s",
1737 family == AF_INET ? "ipv4" : "ipv6", ifname,
1738 family == AF_INET ? "proxy_arp" : "proxy_ndp");
1739 if (ret < 0 || (size_t)ret >= PATH_MAX)
1740 return minus_one_set_errno(E2BIG);
1741
1742 return lxc_read_file_expect(path, buf, 1, "1");
1743 }
1744
1745 int lxc_neigh_proxy_on(const char *name, int family)
1746 {
1747 return neigh_proxy_set(name, family, 1);
1748 }
1749
1750 int lxc_neigh_proxy_off(const char *name, int family)
1751 {
1752 return neigh_proxy_set(name, family, 0);
1753 }
1754
1755 int lxc_convert_mac(char *macaddr, struct sockaddr *sockaddr)
1756 {
1757 int i = 0;
1758 unsigned val;
1759 char c;
1760 unsigned char *data;
1761
1762 sockaddr->sa_family = ARPHRD_ETHER;
1763 data = (unsigned char *)sockaddr->sa_data;
1764
1765 while ((*macaddr != '\0') && (i < ETH_ALEN)) {
1766 c = *macaddr++;
1767 if (isdigit(c))
1768 val = c - '0';
1769 else if (c >= 'a' && c <= 'f')
1770 val = c - 'a' + 10;
1771 else if (c >= 'A' && c <= 'F')
1772 val = c - 'A' + 10;
1773 else
1774 return -EINVAL;
1775
1776 val <<= 4;
1777 c = *macaddr;
1778 if (isdigit(c))
1779 val |= c - '0';
1780 else if (c >= 'a' && c <= 'f')
1781 val |= c - 'a' + 10;
1782 else if (c >= 'A' && c <= 'F')
1783 val |= c - 'A' + 10;
1784 else if (c == ':' || c == 0)
1785 val >>= 4;
1786 else
1787 return -EINVAL;
1788 if (c != 0)
1789 macaddr++;
1790 *data++ = (unsigned char)(val & 0377);
1791 i++;
1792
1793 if (*macaddr == ':')
1794 macaddr++;
1795 }
1796
1797 return 0;
1798 }
1799
1800 static int ip_addr_add(int family, int ifindex, void *addr, void *bcast,
1801 void *acast, int prefix)
1802 {
1803 int addrlen, err;
1804 struct ifaddrmsg *ifa;
1805 struct nl_handler nlh;
1806 struct nlmsg *answer = NULL, *nlmsg = NULL;
1807
1808 addrlen = family == AF_INET ? sizeof(struct in_addr)
1809 : sizeof(struct in6_addr);
1810
1811 err = netlink_open(&nlh, NETLINK_ROUTE);
1812 if (err)
1813 return err;
1814
1815 err = -ENOMEM;
1816 nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE);
1817 if (!nlmsg)
1818 goto out;
1819
1820 answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE);
1821 if (!answer)
1822 goto out;
1823
1824 nlmsg->nlmsghdr->nlmsg_flags =
1825 NLM_F_ACK | NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL;
1826 nlmsg->nlmsghdr->nlmsg_type = RTM_NEWADDR;
1827
1828 ifa = nlmsg_reserve(nlmsg, sizeof(struct ifaddrmsg));
1829 if (!ifa)
1830 goto out;
1831 ifa->ifa_prefixlen = prefix;
1832 ifa->ifa_index = ifindex;
1833 ifa->ifa_family = family;
1834 ifa->ifa_scope = 0;
1835
1836 err = -EINVAL;
1837 if (nla_put_buffer(nlmsg, IFA_LOCAL, addr, addrlen))
1838 goto out;
1839
1840 if (nla_put_buffer(nlmsg, IFA_ADDRESS, addr, addrlen))
1841 goto out;
1842
1843 if (nla_put_buffer(nlmsg, IFA_BROADCAST, bcast, addrlen))
1844 goto out;
1845
1846 /* TODO: multicast, anycast with ipv6 */
1847 err = -EPROTONOSUPPORT;
1848 if (family == AF_INET6 &&
1849 (memcmp(bcast, &in6addr_any, sizeof(in6addr_any)) ||
1850 memcmp(acast, &in6addr_any, sizeof(in6addr_any))))
1851 goto out;
1852
1853 err = netlink_transaction(&nlh, nlmsg, answer);
1854 out:
1855 netlink_close(&nlh);
1856 nlmsg_free(answer);
1857 nlmsg_free(nlmsg);
1858 return err;
1859 }
1860
1861 int lxc_ipv6_addr_add(int ifindex, struct in6_addr *addr,
1862 struct in6_addr *mcast, struct in6_addr *acast,
1863 int prefix)
1864 {
1865 return ip_addr_add(AF_INET6, ifindex, addr, mcast, acast, prefix);
1866 }
1867
1868 int lxc_ipv4_addr_add(int ifindex, struct in_addr *addr, struct in_addr *bcast,
1869 int prefix)
1870 {
1871 return ip_addr_add(AF_INET, ifindex, addr, bcast, NULL, prefix);
1872 }
1873
1874 /* Find an IFA_LOCAL (or IFA_ADDRESS if not IFA_LOCAL is present) address from
1875 * the given RTM_NEWADDR message. Allocates memory for the address and stores
1876 * that pointer in *res (so res should be an in_addr** or in6_addr**).
1877 */
1878 #pragma GCC diagnostic push
1879 #pragma GCC diagnostic ignored "-Wcast-align"
1880
1881 static int ifa_get_local_ip(int family, struct nlmsghdr *msg, void **res)
1882 {
1883 int addrlen;
1884 struct ifaddrmsg *ifa = NLMSG_DATA(msg);
1885 struct rtattr *rta = IFA_RTA(ifa);
1886 int attr_len = NLMSG_PAYLOAD(msg, sizeof(struct ifaddrmsg));
1887
1888 if (ifa->ifa_family != family)
1889 return 0;
1890
1891 addrlen = family == AF_INET ? sizeof(struct in_addr)
1892 : sizeof(struct in6_addr);
1893
1894 /* Loop over the rtattr's in this message */
1895 while (RTA_OK(rta, attr_len)) {
1896 /* Found a local address for the requested interface,
1897 * return it.
1898 */
1899 if (rta->rta_type == IFA_LOCAL ||
1900 rta->rta_type == IFA_ADDRESS) {
1901 /* Sanity check. The family check above should make sure
1902 * the address length is correct, but check here just in
1903 * case.
1904 */
1905 if (RTA_PAYLOAD(rta) != addrlen)
1906 return -1;
1907
1908 /* We might have found an IFA_ADDRESS before, which we
1909 * now overwrite with an IFA_LOCAL.
1910 */
1911 if (!*res) {
1912 *res = malloc(addrlen);
1913 if (!*res)
1914 return -1;
1915 }
1916
1917 memcpy(*res, RTA_DATA(rta), addrlen);
1918 if (rta->rta_type == IFA_LOCAL)
1919 break;
1920 }
1921 rta = RTA_NEXT(rta, attr_len);
1922 }
1923 return 0;
1924 }
1925
1926 #pragma GCC diagnostic pop
1927
1928 static int ip_addr_get(int family, int ifindex, void **res)
1929 {
1930 int answer_len, err;
1931 struct ifaddrmsg *ifa;
1932 struct nl_handler nlh;
1933 struct nlmsghdr *msg;
1934 int readmore = 0, recv_len = 0;
1935 struct nlmsg *answer = NULL, *nlmsg = NULL;
1936
1937 err = netlink_open(&nlh, NETLINK_ROUTE);
1938 if (err)
1939 return err;
1940
1941 err = -ENOMEM;
1942 nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE);
1943 if (!nlmsg)
1944 goto out;
1945
1946 answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE);
1947 if (!answer)
1948 goto out;
1949
1950 /* Save the answer buffer length, since it will be overwritten on the
1951 * first receive (and we might need to receive more than once).
1952 */
1953 answer_len = answer->nlmsghdr->nlmsg_len;
1954
1955 nlmsg->nlmsghdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT;
1956 nlmsg->nlmsghdr->nlmsg_type = RTM_GETADDR;
1957
1958 ifa = nlmsg_reserve(nlmsg, sizeof(struct ifaddrmsg));
1959 if (!ifa)
1960 goto out;
1961 ifa->ifa_family = family;
1962
1963 /* Send the request for addresses, which returns all addresses on all
1964 * interfaces.
1965 */
1966 err = netlink_send(&nlh, nlmsg);
1967 if (err < 0)
1968 goto out;
1969
1970 #pragma GCC diagnostic push
1971 #pragma GCC diagnostic ignored "-Wcast-align"
1972
1973 do {
1974 /* Restore the answer buffer length, it might have been
1975 * overwritten by a previous receive.
1976 */
1977 answer->nlmsghdr->nlmsg_len = answer_len;
1978
1979 /* Get the (next) batch of reply messages. */
1980 err = netlink_rcv(&nlh, answer);
1981 if (err < 0)
1982 goto out;
1983
1984 recv_len = err;
1985 err = 0;
1986
1987 /* Satisfy the typing for the netlink macros. */
1988 msg = answer->nlmsghdr;
1989
1990 while (NLMSG_OK(msg, recv_len)) {
1991 /* Stop reading if we see an error message. */
1992 if (msg->nlmsg_type == NLMSG_ERROR) {
1993 struct nlmsgerr *errmsg =
1994 (struct nlmsgerr *)NLMSG_DATA(msg);
1995 err = errmsg->error;
1996 goto out;
1997 }
1998
1999 /* Stop reading if we see a NLMSG_DONE message. */
2000 if (msg->nlmsg_type == NLMSG_DONE) {
2001 readmore = 0;
2002 break;
2003 }
2004
2005 if (msg->nlmsg_type != RTM_NEWADDR) {
2006 err = -1;
2007 goto out;
2008 }
2009
2010 ifa = (struct ifaddrmsg *)NLMSG_DATA(msg);
2011 if (ifa->ifa_index == ifindex) {
2012 if (ifa_get_local_ip(family, msg, res) < 0) {
2013 err = -1;
2014 goto out;
2015 }
2016
2017 /* Found a result, stop searching. */
2018 if (*res)
2019 goto out;
2020 }
2021
2022 /* Keep reading more data from the socket if the last
2023 * message had the NLF_F_MULTI flag set.
2024 */
2025 readmore = (msg->nlmsg_flags & NLM_F_MULTI);
2026
2027 /* Look at the next message received in this buffer. */
2028 msg = NLMSG_NEXT(msg, recv_len);
2029 }
2030 } while (readmore);
2031
2032 #pragma GCC diagnostic pop
2033
2034 /* If we end up here, we didn't find any result, so signal an
2035 * error.
2036 */
2037 err = -1;
2038
2039 out:
2040 netlink_close(&nlh);
2041 nlmsg_free(answer);
2042 nlmsg_free(nlmsg);
2043 return err;
2044 }
2045
2046 int lxc_ipv6_addr_get(int ifindex, struct in6_addr **res)
2047 {
2048 return ip_addr_get(AF_INET6, ifindex, (void **)res);
2049 }
2050
2051 int lxc_ipv4_addr_get(int ifindex, struct in_addr **res)
2052 {
2053 return ip_addr_get(AF_INET, ifindex, (void **)res);
2054 }
2055
2056 static int ip_gateway_add(int family, int ifindex, void *gw)
2057 {
2058 int addrlen, err;
2059 struct nl_handler nlh;
2060 struct rtmsg *rt;
2061 struct nlmsg *answer = NULL, *nlmsg = NULL;
2062
2063 addrlen = family == AF_INET ? sizeof(struct in_addr)
2064 : sizeof(struct in6_addr);
2065
2066 err = netlink_open(&nlh, NETLINK_ROUTE);
2067 if (err)
2068 return err;
2069
2070 err = -ENOMEM;
2071 nlmsg = nlmsg_alloc(NLMSG_GOOD_SIZE);
2072 if (!nlmsg)
2073 goto out;
2074
2075 answer = nlmsg_alloc_reserve(NLMSG_GOOD_SIZE);
2076 if (!answer)
2077 goto out;
2078
2079 nlmsg->nlmsghdr->nlmsg_flags =
2080 NLM_F_ACK | NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL;
2081 nlmsg->nlmsghdr->nlmsg_type = RTM_NEWROUTE;
2082
2083 rt = nlmsg_reserve(nlmsg, sizeof(struct rtmsg));
2084 if (!rt)
2085 goto out;
2086 rt->rtm_family = family;
2087 rt->rtm_table = RT_TABLE_MAIN;
2088 rt->rtm_scope = RT_SCOPE_UNIVERSE;
2089 rt->rtm_protocol = RTPROT_BOOT;
2090 rt->rtm_type = RTN_UNICAST;
2091 /* "default" destination */
2092 rt->rtm_dst_len = 0;
2093
2094 err = -EINVAL;
2095
2096 /* If gateway address not supplied, then a device route will be created instead */
2097 if (gw != NULL) {
2098 if (nla_put_buffer(nlmsg, RTA_GATEWAY, gw, addrlen))
2099 goto out;
2100 }
2101
2102 /* Adding the interface index enables the use of link-local
2103 * addresses for the gateway.
2104 */
2105 if (nla_put_u32(nlmsg, RTA_OIF, ifindex))
2106 goto out;
2107
2108 err = netlink_transaction(&nlh, nlmsg, answer);
2109 out:
2110 netlink_close(&nlh);
2111 nlmsg_free(answer);
2112 nlmsg_free(nlmsg);
2113 return err;
2114 }
2115
2116 int lxc_ipv4_gateway_add(int ifindex, struct in_addr *gw)
2117 {
2118 return ip_gateway_add(AF_INET, ifindex, gw);
2119 }
2120
2121 int lxc_ipv6_gateway_add(int ifindex, struct in6_addr *gw)
2122 {
2123 return ip_gateway_add(AF_INET6, ifindex, gw);
2124 }
2125 bool is_ovs_bridge(const char *bridge)
2126 {
2127 int ret;
2128 struct stat sb;
2129 char brdirname[22 + IFNAMSIZ + 1] = {0};
2130
2131 ret = snprintf(brdirname, 22 + IFNAMSIZ + 1, "/sys/class/net/%s/bridge",
2132 bridge);
2133 if (ret < 0 || (size_t)ret >= 22 + IFNAMSIZ + 1)
2134 return false;
2135
2136 ret = stat(brdirname, &sb);
2137 if (ret < 0 && errno == ENOENT)
2138 return true;
2139
2140 return false;
2141 }
2142
2143 struct ovs_veth_args {
2144 const char *bridge;
2145 const char *nic;
2146 };
2147
2148 /* Called from a background thread - when nic goes away, remove it from the
2149 * bridge.
2150 */
2151 static int lxc_ovs_delete_port_exec(void *data)
2152 {
2153 struct ovs_veth_args *args = data;
2154
2155 execlp("ovs-vsctl", "ovs-vsctl", "del-port", args->bridge, args->nic,
2156 (char *)NULL);
2157 return -1;
2158 }
2159
2160 int lxc_ovs_delete_port(const char *bridge, const char *nic)
2161 {
2162 int ret;
2163 char cmd_output[PATH_MAX];
2164 struct ovs_veth_args args;
2165
2166 args.bridge = bridge;
2167 args.nic = nic;
2168 ret = run_command(cmd_output, sizeof(cmd_output),
2169 lxc_ovs_delete_port_exec, (void *)&args);
2170 if (ret < 0) {
2171 ERROR("Failed to delete \"%s\" from openvswitch bridge \"%s\": "
2172 "%s", bridge, nic, cmd_output);
2173 return -1;
2174 }
2175
2176 return 0;
2177 }
2178
2179 static int lxc_ovs_attach_bridge_exec(void *data)
2180 {
2181 struct ovs_veth_args *args = data;
2182
2183 execlp("ovs-vsctl", "ovs-vsctl", "add-port", args->bridge, args->nic,
2184 (char *)NULL);
2185 return -1;
2186 }
2187
2188 static int lxc_ovs_attach_bridge(const char *bridge, const char *nic)
2189 {
2190 int ret;
2191 char cmd_output[PATH_MAX];
2192 struct ovs_veth_args args;
2193
2194 args.bridge = bridge;
2195 args.nic = nic;
2196 ret = run_command(cmd_output, sizeof(cmd_output),
2197 lxc_ovs_attach_bridge_exec, (void *)&args);
2198 if (ret < 0) {
2199 ERROR("Failed to attach \"%s\" to openvswitch bridge \"%s\": %s",
2200 bridge, nic, cmd_output);
2201 return -1;
2202 }
2203
2204 return 0;
2205 }
2206
2207 int lxc_bridge_attach(const char *bridge, const char *ifname)
2208 {
2209 int err, fd, index;
2210 size_t retlen;
2211 struct ifreq ifr;
2212
2213 if (strlen(ifname) >= IFNAMSIZ)
2214 return -EINVAL;
2215
2216 index = if_nametoindex(ifname);
2217 if (!index)
2218 return -EINVAL;
2219
2220 if (is_ovs_bridge(bridge))
2221 return lxc_ovs_attach_bridge(bridge, ifname);
2222
2223 fd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0);
2224 if (fd < 0)
2225 return -errno;
2226
2227 retlen = strlcpy(ifr.ifr_name, bridge, IFNAMSIZ);
2228 if (retlen >= IFNAMSIZ) {
2229 close(fd);
2230 return -E2BIG;
2231 }
2232
2233 ifr.ifr_name[IFNAMSIZ - 1] = '\0';
2234 ifr.ifr_ifindex = index;
2235 err = ioctl(fd, SIOCBRADDIF, &ifr);
2236 close(fd);
2237 if (err)
2238 err = -errno;
2239
2240 return err;
2241 }
2242
2243 static const char *const lxc_network_types[LXC_NET_MAXCONFTYPE + 1] = {
2244 [LXC_NET_EMPTY] = "empty",
2245 [LXC_NET_VETH] = "veth",
2246 [LXC_NET_MACVLAN] = "macvlan",
2247 [LXC_NET_IPVLAN] = "ipvlan",
2248 [LXC_NET_PHYS] = "phys",
2249 [LXC_NET_VLAN] = "vlan",
2250 [LXC_NET_NONE] = "none",
2251 };
2252
2253 const char *lxc_net_type_to_str(int type)
2254 {
2255 if (type < 0 || type > LXC_NET_MAXCONFTYPE)
2256 return NULL;
2257
2258 return lxc_network_types[type];
2259 }
2260
2261 static const char padchar[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
2262
2263 char *lxc_mkifname(char *template)
2264 {
2265 int ret;
2266 struct netns_ifaddrs *ifa, *ifaddr;
2267 char name[IFNAMSIZ];
2268 bool exists = false;
2269 size_t i = 0;
2270 #ifdef HAVE_RAND_R
2271 unsigned int seed;
2272
2273 seed = randseed(false);
2274 #else
2275
2276 (void)randseed(true);
2277 #endif
2278
2279 if (strlen(template) >= IFNAMSIZ)
2280 return NULL;
2281
2282 /* Get all the network interfaces. */
2283 ret = netns_getifaddrs(&ifaddr, -1, &(bool){false});
2284 if (ret < 0) {
2285 SYSERROR("Failed to get network interfaces");
2286 return NULL;
2287 }
2288
2289 /* Generate random names until we find one that doesn't exist. */
2290 for (;;) {
2291 name[0] = '\0';
2292 (void)strlcpy(name, template, IFNAMSIZ);
2293
2294 exists = false;
2295
2296 for (i = 0; i < strlen(name); i++) {
2297 if (name[i] == 'X') {
2298 #ifdef HAVE_RAND_R
2299 name[i] = padchar[rand_r(&seed) % strlen(padchar)];
2300 #else
2301 name[i] = padchar[rand() % strlen(padchar)];
2302 #endif
2303 }
2304 }
2305
2306 for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
2307 if (!strcmp(ifa->ifa_name, name)) {
2308 exists = true;
2309 break;
2310 }
2311 }
2312
2313 if (!exists)
2314 break;
2315 }
2316
2317 netns_freeifaddrs(ifaddr);
2318 (void)strlcpy(template, name, strlen(template) + 1);
2319
2320 return template;
2321 }
2322
2323 int setup_private_host_hw_addr(char *veth1)
2324 {
2325 int err, sockfd;
2326 struct ifreq ifr;
2327
2328 sockfd = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
2329 if (sockfd < 0)
2330 return -errno;
2331
2332 err = snprintf((char *)ifr.ifr_name, IFNAMSIZ, "%s", veth1);
2333 if (err < 0 || (size_t)err >= IFNAMSIZ) {
2334 close(sockfd);
2335 return -E2BIG;
2336 }
2337
2338 err = ioctl(sockfd, SIOCGIFHWADDR, &ifr);
2339 if (err < 0) {
2340 close(sockfd);
2341 return -errno;
2342 }
2343
2344 ifr.ifr_hwaddr.sa_data[0] = 0xfe;
2345 err = ioctl(sockfd, SIOCSIFHWADDR, &ifr);
2346 close(sockfd);
2347 if (err < 0)
2348 return -errno;
2349
2350 return 0;
2351 }
2352
2353 int lxc_find_gateway_addresses(struct lxc_handler *handler)
2354 {
2355 struct lxc_list *network = &handler->conf->network;
2356 struct lxc_list *iterator;
2357 struct lxc_netdev *netdev;
2358 int link_index;
2359
2360 lxc_list_for_each(iterator, network) {
2361 netdev = iterator->elem;
2362
2363 if (!netdev->ipv4_gateway_auto && !netdev->ipv6_gateway_auto)
2364 continue;
2365
2366 if (netdev->type != LXC_NET_VETH && netdev->type != LXC_NET_MACVLAN) {
2367 ERROR("Automatic gateway detection is only supported "
2368 "for veth and macvlan");
2369 return -1;
2370 }
2371
2372 if (netdev->link[0] == '\0') {
2373 ERROR("Automatic gateway detection needs a link interface");
2374 return -1;
2375 }
2376
2377 link_index = if_nametoindex(netdev->link);
2378 if (!link_index)
2379 return -EINVAL;
2380
2381 if (netdev->ipv4_gateway_auto) {
2382 if (lxc_ipv4_addr_get(link_index, &netdev->ipv4_gateway)) {
2383 ERROR("Failed to automatically find ipv4 gateway "
2384 "address from link interface \"%s\"", netdev->link);
2385 return -1;
2386 }
2387 }
2388
2389 if (netdev->ipv6_gateway_auto) {
2390 if (lxc_ipv6_addr_get(link_index, &netdev->ipv6_gateway)) {
2391 ERROR("Failed to automatically find ipv6 gateway "
2392 "address from link interface \"%s\"", netdev->link);
2393 return -1;
2394 }
2395 }
2396 }
2397
2398 return 0;
2399 }
2400
2401 #define LXC_USERNIC_PATH LIBEXECDIR "/lxc/lxc-user-nic"
2402 static int lxc_create_network_unpriv_exec(const char *lxcpath, const char *lxcname,
2403 struct lxc_netdev *netdev, pid_t pid, unsigned int hooks_version)
2404 {
2405 int ret;
2406 pid_t child;
2407 int bytes, pipefd[2];
2408 char *token, *saveptr = NULL;
2409 char netdev_link[IFNAMSIZ];
2410 char buffer[PATH_MAX] = {0};
2411 size_t retlen;
2412
2413 if (netdev->type != LXC_NET_VETH) {
2414 ERROR("Network type %d not support for unprivileged use", netdev->type);
2415 return -1;
2416 }
2417
2418 ret = pipe(pipefd);
2419 if (ret < 0) {
2420 SYSERROR("Failed to create pipe");
2421 return -1;
2422 }
2423
2424 child = fork();
2425 if (child < 0) {
2426 SYSERROR("Failed to create new process");
2427 close(pipefd[0]);
2428 close(pipefd[1]);
2429 return -1;
2430 }
2431
2432 if (child == 0) {
2433 char pidstr[INTTYPE_TO_STRLEN(pid_t)];
2434
2435 close(pipefd[0]);
2436
2437 ret = dup2(pipefd[1], STDOUT_FILENO);
2438 if (ret >= 0)
2439 ret = dup2(pipefd[1], STDERR_FILENO);
2440 close(pipefd[1]);
2441 if (ret < 0) {
2442 SYSERROR("Failed to duplicate std{err,out} file descriptor");
2443 _exit(EXIT_FAILURE);
2444 }
2445
2446 if (netdev->link[0] != '\0')
2447 retlen = strlcpy(netdev_link, netdev->link, IFNAMSIZ);
2448 else
2449 retlen = strlcpy(netdev_link, "none", IFNAMSIZ);
2450 if (retlen >= IFNAMSIZ) {
2451 SYSERROR("Invalid network device name");
2452 _exit(EXIT_FAILURE);
2453 }
2454
2455 ret = snprintf(pidstr, sizeof(pidstr), "%d", pid);
2456 if (ret < 0 || ret >= sizeof(pidstr))
2457 _exit(EXIT_FAILURE);
2458 pidstr[sizeof(pidstr) - 1] = '\0';
2459
2460 INFO("Execing lxc-user-nic create %s %s %s veth %s %s", lxcpath,
2461 lxcname, pidstr, netdev_link,
2462 netdev->name[0] != '\0' ? netdev->name : "(null)");
2463 if (netdev->name[0] != '\0')
2464 execlp(LXC_USERNIC_PATH, LXC_USERNIC_PATH, "create",
2465 lxcpath, lxcname, pidstr, "veth", netdev_link,
2466 netdev->name, (char *)NULL);
2467 else
2468 execlp(LXC_USERNIC_PATH, LXC_USERNIC_PATH, "create",
2469 lxcpath, lxcname, pidstr, "veth", netdev_link,
2470 (char *)NULL);
2471 SYSERROR("Failed to execute lxc-user-nic");
2472 _exit(EXIT_FAILURE);
2473 }
2474
2475 /* close the write-end of the pipe */
2476 close(pipefd[1]);
2477
2478 bytes = lxc_read_nointr(pipefd[0], &buffer, PATH_MAX);
2479 if (bytes < 0) {
2480 SYSERROR("Failed to read from pipe file descriptor");
2481 close(pipefd[0]);
2482 } else {
2483 buffer[bytes - 1] = '\0';
2484 }
2485
2486 ret = wait_for_pid(child);
2487 close(pipefd[0]);
2488 if (ret != 0 || bytes < 0) {
2489 ERROR("lxc-user-nic failed to configure requested network: %s",
2490 buffer[0] != '\0' ? buffer : "(null)");
2491 return -1;
2492 }
2493 TRACE("Received output \"%s\" from lxc-user-nic", buffer);
2494
2495 /* netdev->name */
2496 token = strtok_r(buffer, ":", &saveptr);
2497 if (!token) {
2498 ERROR("Failed to parse lxc-user-nic output");
2499 return -1;
2500 }
2501
2502 memset(netdev->name, 0, IFNAMSIZ);
2503 memcpy(netdev->name, token, IFNAMSIZ - 1);
2504
2505 /* netdev->ifindex */
2506 token = strtok_r(NULL, ":", &saveptr);
2507 if (!token) {
2508 ERROR("Failed to parse lxc-user-nic output");
2509 return -1;
2510 }
2511
2512 ret = lxc_safe_int(token, &netdev->ifindex);
2513 if (ret < 0) {
2514 errno = -ret;
2515 SYSERROR("Failed to convert string \"%s\" to integer", token);
2516 return -1;
2517 }
2518
2519 /* netdev->priv.veth_attr.veth1 */
2520 token = strtok_r(NULL, ":", &saveptr);
2521 if (!token) {
2522 ERROR("Failed to parse lxc-user-nic output");
2523 return -1;
2524 }
2525
2526 retlen = strlcpy(netdev->priv.veth_attr.veth1, token, IFNAMSIZ);
2527 if (retlen >= IFNAMSIZ) {
2528 ERROR("Host side veth device name returned by lxc-user-nic is "
2529 "too long");
2530 return -E2BIG;
2531 }
2532
2533 /* netdev->priv.veth_attr.ifindex */
2534 token = strtok_r(NULL, ":", &saveptr);
2535 if (!token) {
2536 ERROR("Failed to parse lxc-user-nic output");
2537 return -1;
2538 }
2539
2540 ret = lxc_safe_int(token, &netdev->priv.veth_attr.ifindex);
2541 if (ret < 0) {
2542 errno = -ret;
2543 SYSERROR("Failed to convert string \"%s\" to integer", token);
2544 return -1;
2545 }
2546
2547 if (netdev->upscript) {
2548 char *argv[] = {
2549 "veth",
2550 netdev->link,
2551 netdev->priv.veth_attr.veth1,
2552 NULL,
2553 };
2554
2555 ret = run_script_argv(lxcname,
2556 hooks_version, "net",
2557 netdev->upscript, "up", argv);
2558 if (ret < 0)
2559 return -1;
2560 }
2561
2562 return 0;
2563 }
2564
2565 static int lxc_delete_network_unpriv_exec(const char *lxcpath, const char *lxcname,
2566 struct lxc_netdev *netdev,
2567 const char *netns_path)
2568 {
2569 int bytes, ret;
2570 pid_t child;
2571 int pipefd[2];
2572 char buffer[PATH_MAX] = {0};
2573
2574 if (netdev->type != LXC_NET_VETH) {
2575 ERROR("Network type %d not support for unprivileged use", netdev->type);
2576 return -1;
2577 }
2578
2579 ret = pipe(pipefd);
2580 if (ret < 0) {
2581 SYSERROR("Failed to create pipe");
2582 return -1;
2583 }
2584
2585 child = fork();
2586 if (child < 0) {
2587 SYSERROR("Failed to create new process");
2588 close(pipefd[0]);
2589 close(pipefd[1]);
2590 return -1;
2591 }
2592
2593 if (child == 0) {
2594 char *hostveth;
2595
2596 close(pipefd[0]);
2597
2598 ret = dup2(pipefd[1], STDOUT_FILENO);
2599 if (ret >= 0)
2600 ret = dup2(pipefd[1], STDERR_FILENO);
2601 close(pipefd[1]);
2602 if (ret < 0) {
2603 SYSERROR("Failed to duplicate std{err,out} file descriptor");
2604 _exit(EXIT_FAILURE);
2605 }
2606
2607 if (netdev->priv.veth_attr.pair[0] != '\0')
2608 hostveth = netdev->priv.veth_attr.pair;
2609 else
2610 hostveth = netdev->priv.veth_attr.veth1;
2611 if (hostveth[0] == '\0') {
2612 SYSERROR("Host side veth device name is missing");
2613 _exit(EXIT_FAILURE);
2614 }
2615
2616 if (netdev->link[0] == '\0') {
2617 SYSERROR("Network link for network device \"%s\" is "
2618 "missing", netdev->priv.veth_attr.veth1);
2619 _exit(EXIT_FAILURE);
2620 }
2621
2622 INFO("Execing lxc-user-nic delete %s %s %s veth %s %s", lxcpath,
2623 lxcname, netns_path, netdev->link, hostveth);
2624 execlp(LXC_USERNIC_PATH, LXC_USERNIC_PATH, "delete", lxcpath,
2625 lxcname, netns_path, "veth", netdev->link, hostveth,
2626 (char *)NULL);
2627 SYSERROR("Failed to exec lxc-user-nic.");
2628 _exit(EXIT_FAILURE);
2629 }
2630
2631 close(pipefd[1]);
2632
2633 bytes = lxc_read_nointr(pipefd[0], &buffer, PATH_MAX);
2634 if (bytes < 0) {
2635 SYSERROR("Failed to read from pipe file descriptor.");
2636 close(pipefd[0]);
2637 } else {
2638 buffer[bytes - 1] = '\0';
2639 }
2640
2641 ret = wait_for_pid(child);
2642 close(pipefd[0]);
2643 if (ret != 0 || bytes < 0) {
2644 ERROR("lxc-user-nic failed to delete requested network: %s",
2645 buffer[0] != '\0' ? buffer : "(null)");
2646 return -1;
2647 }
2648
2649 return 0;
2650 }
2651
2652 bool lxc_delete_network_unpriv(struct lxc_handler *handler)
2653 {
2654 int ret;
2655 struct lxc_list *iterator;
2656 struct lxc_list *network = &handler->conf->network;
2657 /* strlen("/proc/") = 6
2658 * +
2659 * INTTYPE_TO_STRLEN(pid_t)
2660 * +
2661 * strlen("/fd/") = 4
2662 * +
2663 * INTTYPE_TO_STRLEN(int)
2664 * +
2665 * \0
2666 */
2667 char netns_path[6 + INTTYPE_TO_STRLEN(pid_t) + 4 + INTTYPE_TO_STRLEN(int) + 1];
2668
2669 *netns_path = '\0';
2670
2671 if (handler->nsfd[LXC_NS_NET] < 0) {
2672 DEBUG("Cannot not guarantee safe deletion of network devices. "
2673 "Manual cleanup maybe needed");
2674 return false;
2675 }
2676
2677 ret = snprintf(netns_path, sizeof(netns_path), "/proc/%d/fd/%d",
2678 lxc_raw_getpid(), handler->nsfd[LXC_NS_NET]);
2679 if (ret < 0 || ret >= sizeof(netns_path))
2680 return false;
2681
2682 lxc_list_for_each(iterator, network) {
2683 char *hostveth = NULL;
2684 struct lxc_netdev *netdev = iterator->elem;
2685
2686 /* We can only delete devices whose ifindex we have. If we don't
2687 * have the index it means that we didn't create it.
2688 */
2689 if (!netdev->ifindex)
2690 continue;
2691
2692 if (netdev->type == LXC_NET_PHYS) {
2693 ret = lxc_netdev_rename_by_index(netdev->ifindex,
2694 netdev->link);
2695 if (ret < 0)
2696 WARN("Failed to rename interface with index %d "
2697 "to its initial name \"%s\"",
2698 netdev->ifindex, netdev->link);
2699 else
2700 TRACE("Renamed interface with index %d to its "
2701 "initial name \"%s\"",
2702 netdev->ifindex, netdev->link);
2703 goto clear_ifindices;
2704 }
2705
2706 ret = netdev_deconf[netdev->type](handler, netdev);
2707 if (ret < 0)
2708 WARN("Failed to deconfigure network device");
2709
2710 if (netdev->type != LXC_NET_VETH)
2711 goto clear_ifindices;
2712
2713 if (netdev->link[0] == '\0' || !is_ovs_bridge(netdev->link))
2714 goto clear_ifindices;
2715
2716 if (netdev->priv.veth_attr.pair[0] != '\0')
2717 hostveth = netdev->priv.veth_attr.pair;
2718 else
2719 hostveth = netdev->priv.veth_attr.veth1;
2720 if (hostveth[0] == '\0')
2721 goto clear_ifindices;
2722
2723 ret = lxc_delete_network_unpriv_exec(handler->lxcpath,
2724 handler->name, netdev,
2725 netns_path);
2726 if (ret < 0) {
2727 WARN("Failed to remove port \"%s\" from openvswitch "
2728 "bridge \"%s\"", hostveth, netdev->link);
2729 goto clear_ifindices;
2730 }
2731 INFO("Removed interface \"%s\" from \"%s\"", hostveth,
2732 netdev->link);
2733
2734 clear_ifindices:
2735 /* We need to clear any ifindices we recorded so liblxc won't
2736 * have cached stale data which would cause it to fail on reboot
2737 * we're we don't re-read the on-disk config file.
2738 */
2739 netdev->ifindex = 0;
2740 if (netdev->type == LXC_NET_PHYS) {
2741 netdev->priv.phys_attr.ifindex = 0;
2742 } else if (netdev->type == LXC_NET_VETH) {
2743 netdev->priv.veth_attr.veth1[0] = '\0';
2744 netdev->priv.veth_attr.ifindex = 0;
2745 }
2746 }
2747
2748 return true;
2749 }
2750
2751 struct ip_proxy_args {
2752 const char *ip;
2753 const char *dev;
2754 };
2755
2756 static int lxc_add_ip_neigh_proxy_exec_wrapper(void *data)
2757 {
2758 struct ip_proxy_args *args = data;
2759
2760 execlp("ip", "ip", "neigh", "add", "proxy", args->ip, "dev", args->dev, (char *)NULL);
2761 return -1;
2762 }
2763
2764 static int lxc_del_ip_neigh_proxy_exec_wrapper(void *data)
2765 {
2766 struct ip_proxy_args *args = data;
2767
2768 execlp("ip", "ip", "neigh", "flush", "proxy", args->ip, "dev", args->dev, (char *)NULL);
2769 return -1;
2770 }
2771
2772 static int lxc_add_ip_neigh_proxy(const char *ip, const char *dev)
2773 {
2774 int ret;
2775 char cmd_output[PATH_MAX];
2776 struct ip_proxy_args args = {
2777 .ip = ip,
2778 .dev = dev,
2779 };
2780
2781 ret = run_command(cmd_output, sizeof(cmd_output), lxc_add_ip_neigh_proxy_exec_wrapper, &args);
2782 if (ret < 0) {
2783 ERROR("Failed to add ip proxy \"%s\" to dev \"%s\": %s", ip, dev, cmd_output);
2784 return -1;
2785 }
2786
2787 return 0;
2788 }
2789
2790 static int lxc_del_ip_neigh_proxy(const char *ip, const char *dev)
2791 {
2792 int ret;
2793 char cmd_output[PATH_MAX];
2794 struct ip_proxy_args args = {
2795 .ip = ip,
2796 .dev = dev,
2797 };
2798
2799 ret = run_command(cmd_output, sizeof(cmd_output), lxc_del_ip_neigh_proxy_exec_wrapper, &args);
2800 if (ret < 0) {
2801 ERROR("Failed to delete ip proxy \"%s\" to dev \"%s\": %s", ip, dev, cmd_output);
2802 return -1;
2803 }
2804
2805 return 0;
2806 }
2807
2808 static int lxc_setup_l2proxy(struct lxc_netdev *netdev) {
2809 struct lxc_list *cur, *next;
2810 struct lxc_inetdev *inet4dev;
2811 struct lxc_inet6dev *inet6dev;
2812 char bufinet4[INET_ADDRSTRLEN], bufinet6[INET6_ADDRSTRLEN];
2813 int err = 0;
2814 unsigned int lo_ifindex = 0;
2815
2816 /* If IPv4 addresses are specified, then check that sysctl is configured correctly. */
2817 if (!lxc_list_empty(&netdev->ipv4)) {
2818 /* Check for net.ipv4.conf.[link].forwarding=1 */
2819 if (lxc_is_ip_forwarding_enabled(netdev->link, AF_INET) < 0) {
2820 ERROR("Requires sysctl net.ipv4.conf.%s.forwarding=1", netdev->link);
2821 return minus_one_set_errno(EINVAL);
2822 }
2823 }
2824
2825 /* If IPv6 addresses are specified, then check that sysctl is configured correctly. */
2826 if (!lxc_list_empty(&netdev->ipv6)) {
2827 /* Check for net.ipv6.conf.[link].proxy_ndp=1 */
2828 if (lxc_is_ip_neigh_proxy_enabled(netdev->link, AF_INET6) < 0) {
2829 ERROR("Requires sysctl net.ipv6.conf.%s.proxy_ndp=1", netdev->link);
2830 return minus_one_set_errno(EINVAL);
2831 }
2832
2833 /* Check for net.ipv6.conf.[link].forwarding=1 */
2834 if (lxc_is_ip_forwarding_enabled(netdev->link, AF_INET6) < 0) {
2835 ERROR("Requires sysctl net.ipv6.conf.%s.forwarding=1", netdev->link);
2836 return minus_one_set_errno(EINVAL);
2837 }
2838 }
2839
2840 /* Perform IPVLAN specific checks. */
2841 if (netdev->type == LXC_NET_IPVLAN) {
2842 /* Check mode is l3s as other modes do not work with l2proxy. */
2843 if (netdev->priv.ipvlan_attr.mode != IPVLAN_MODE_L3S) {
2844 ERROR("Requires ipvlan mode on dev \"%s\" be l3s when used with l2proxy", netdev->link);
2845 return minus_one_set_errno(EINVAL);
2846 }
2847
2848 /* Retrieve local-loopback interface index for use with IPVLAN static routes. */
2849 lo_ifindex = if_nametoindex(loDev);
2850 if (lo_ifindex == 0) {
2851 ERROR("Failed to retrieve ifindex for \"%s\" routing cleanup", loDev);
2852 return minus_one_set_errno(EINVAL);
2853 }
2854 }
2855
2856 lxc_list_for_each_safe(cur, &netdev->ipv4, next) {
2857 inet4dev = cur->elem;
2858 if (!inet_ntop(AF_INET, &inet4dev->addr, bufinet4, sizeof(bufinet4)))
2859 return minus_one_set_errno(-errno);
2860
2861 if (lxc_add_ip_neigh_proxy(bufinet4, netdev->link) < 0)
2862 return minus_one_set_errno(EINVAL);
2863
2864 /* IPVLAN requires a route to local-loopback to trigger l2proxy. */
2865 if (netdev->type == LXC_NET_IPVLAN) {
2866 err = lxc_ipv4_dest_add(lo_ifindex, &inet4dev->addr, 32);
2867 if (err < 0) {
2868 ERROR("Failed to add ipv4 dest \"%s\" for network device \"%s\"", bufinet4, loDev);
2869 return minus_one_set_errno(-err);
2870 }
2871 }
2872 }
2873
2874 lxc_list_for_each_safe(cur, &netdev->ipv6, next) {
2875 inet6dev = cur->elem;
2876 if (!inet_ntop(AF_INET6, &inet6dev->addr, bufinet6, sizeof(bufinet6)))
2877 return minus_one_set_errno(-errno);
2878
2879 if (lxc_add_ip_neigh_proxy(bufinet6, netdev->link) < 0)
2880 return minus_one_set_errno(EINVAL);
2881
2882 /* IPVLAN requires a route to local-loopback to trigger l2proxy. */
2883 if (netdev->type == LXC_NET_IPVLAN) {
2884 err = lxc_ipv6_dest_add(lo_ifindex, &inet6dev->addr, 128);
2885 if (err < 0) {
2886 ERROR("Failed to add ipv6 dest \"%s\" for network device \"%s\"", bufinet6, loDev);
2887 return minus_one_set_errno(-err);
2888 }
2889 }
2890 }
2891
2892 return 0;
2893 }
2894
2895 static int lxc_delete_ipv4_l2proxy(struct in_addr *ip, char *link, unsigned int lo_ifindex) {
2896 char bufinet4[INET_ADDRSTRLEN];
2897 unsigned int errCount = 0;
2898
2899 if (!inet_ntop(AF_INET, ip, bufinet4, sizeof(bufinet4))) {
2900 SYSERROR("Failed to convert IP for l2proxy ipv4 removal on dev \"%s\"", link);
2901 return minus_one_set_errno(EINVAL);
2902 }
2903
2904 /* If a local-loopback ifindex supplied remove the static route to the lo device. */
2905 if (lo_ifindex > 0) {
2906 if (lxc_ipv4_dest_del(lo_ifindex, ip, 32) < 0) {
2907 errCount++;
2908 ERROR("Failed to delete ipv4 dest \"%s\" for network ifindex \"%u\"", bufinet4, lo_ifindex);
2909 }
2910 }
2911
2912 /* If link is supplied remove the IP neigh proxy entry for this IP on the device. */
2913 if (link[0] != '\0') {
2914 if (lxc_del_ip_neigh_proxy(bufinet4, link) < 0)
2915 errCount++;
2916 }
2917
2918 if (errCount > 0)
2919 return minus_one_set_errno(EINVAL);
2920
2921 return 0;
2922 }
2923
2924 static int lxc_delete_ipv6_l2proxy(struct in6_addr *ip, char *link, unsigned int lo_ifindex) {
2925 char bufinet6[INET6_ADDRSTRLEN];
2926 unsigned int errCount = 0;
2927
2928 if (!inet_ntop(AF_INET6, ip, bufinet6, sizeof(bufinet6))) {
2929 SYSERROR("Failed to convert IP for l2proxy ipv6 removal on dev \"%s\"", link);
2930 return minus_one_set_errno(EINVAL);
2931 }
2932
2933 /* If a local-loopback ifindex supplied remove the static route to the lo device. */
2934 if (lo_ifindex > 0) {
2935 if (lxc_ipv6_dest_del(lo_ifindex, ip, 128) < 0) {
2936 errCount++;
2937 ERROR("Failed to delete ipv6 dest \"%s\" for network ifindex \"%u\"", bufinet6, lo_ifindex);
2938 }
2939 }
2940
2941 /* If link is supplied remove the IP neigh proxy entry for this IP on the device. */
2942 if (link[0] != '\0') {
2943 if (lxc_del_ip_neigh_proxy(bufinet6, link) < 0)
2944 errCount++;
2945 }
2946
2947 if (errCount > 0)
2948 return minus_one_set_errno(EINVAL);
2949
2950 return 0;
2951 }
2952
2953 static int lxc_delete_l2proxy(struct lxc_netdev *netdev) {
2954 unsigned int lo_ifindex = 0;
2955 unsigned int errCount = 0;
2956 struct lxc_list *cur, *next;
2957 struct lxc_inetdev *inet4dev;
2958 struct lxc_inet6dev *inet6dev;
2959
2960 /* Perform IPVLAN specific checks. */
2961 if (netdev->type == LXC_NET_IPVLAN) {
2962 /* Retrieve local-loopback interface index for use with IPVLAN static routes. */
2963 lo_ifindex = if_nametoindex(loDev);
2964 if (lo_ifindex == 0) {
2965 errCount++;
2966 ERROR("Failed to retrieve ifindex for \"%s\" routing cleanup", loDev);
2967 }
2968 }
2969
2970 lxc_list_for_each_safe(cur, &netdev->ipv4, next) {
2971 inet4dev = cur->elem;
2972 if (lxc_delete_ipv4_l2proxy(&inet4dev->addr, netdev->link, lo_ifindex) < 0)
2973 errCount++;
2974 }
2975
2976 lxc_list_for_each_safe(cur, &netdev->ipv6, next) {
2977 inet6dev = cur->elem;
2978 if (lxc_delete_ipv6_l2proxy(&inet6dev->addr, netdev->link, lo_ifindex) < 0)
2979 errCount++;
2980 }
2981
2982 if (errCount > 0)
2983 return minus_one_set_errno(EINVAL);
2984
2985 return 0;
2986 }
2987
2988 int lxc_create_network_priv(struct lxc_handler *handler)
2989 {
2990 struct lxc_list *iterator;
2991 struct lxc_list *network = &handler->conf->network;
2992
2993 if (!handler->am_root)
2994 return 0;
2995
2996 lxc_list_for_each(iterator, network) {
2997 struct lxc_netdev *netdev = iterator->elem;
2998
2999 if (netdev->type < 0 || netdev->type > LXC_NET_MAXCONFTYPE) {
3000 ERROR("Invalid network configuration type %d", netdev->type);
3001 return -1;
3002 }
3003
3004 /* Setup l2proxy entries if enabled and used with a link property */
3005 if (netdev->l2proxy && netdev->link[0] != '\0') {
3006 if (lxc_setup_l2proxy(netdev)) {
3007 ERROR("Failed to setup l2proxy");
3008 return -1;
3009 }
3010 }
3011
3012 if (netdev_conf[netdev->type](handler, netdev)) {
3013 ERROR("Failed to create network device");
3014 return -1;
3015 }
3016 }
3017
3018 return 0;
3019 }
3020
3021 int lxc_network_move_created_netdev_priv(const char *lxcpath, const char *lxcname,
3022 struct lxc_list *network, pid_t pid)
3023 {
3024 int ret;
3025 char ifname[IFNAMSIZ];
3026 struct lxc_list *iterator;
3027
3028 if (am_guest_unpriv())
3029 return 0;
3030
3031 lxc_list_for_each(iterator, network) {
3032 struct lxc_netdev *netdev = iterator->elem;
3033
3034 if (!netdev->ifindex)
3035 continue;
3036
3037 /* retrieve the name of the interface */
3038 if (!if_indextoname(netdev->ifindex, ifname)) {
3039 ERROR("No interface corresponding to ifindex \"%d\"",
3040 netdev->ifindex);
3041 return -1;
3042 }
3043
3044 ret = lxc_netdev_move_by_name(ifname, pid, NULL);
3045 if (ret) {
3046 errno = -ret;
3047 SYSERROR("Failed to move network device \"%s\" to "
3048 "network namespace %d", ifname, pid);
3049 return -1;
3050 }
3051
3052 DEBUG("Moved network device \"%s\"/\"%s\" to network namespace "
3053 "of %d",
3054 ifname, netdev->name[0] != '\0' ? netdev->name : "(null)",
3055 pid);
3056 }
3057
3058 return 0;
3059 }
3060
3061 int lxc_create_network_unpriv(const char *lxcpath, const char *lxcname,
3062 struct lxc_list *network, pid_t pid, unsigned int hooks_version)
3063 {
3064 struct lxc_list *iterator;
3065
3066 if (!am_guest_unpriv())
3067 return 0;
3068
3069 lxc_list_for_each(iterator, network) {
3070 struct lxc_netdev *netdev = iterator->elem;
3071
3072 if (netdev->type == LXC_NET_EMPTY)
3073 continue;
3074
3075 if (netdev->type == LXC_NET_NONE)
3076 continue;
3077
3078 if (netdev->type != LXC_NET_VETH) {
3079 ERROR("Networks of type %s are not supported by "
3080 "unprivileged containers",
3081 lxc_net_type_to_str(netdev->type));
3082 return -1;
3083 }
3084
3085 if (netdev->mtu)
3086 INFO("mtu ignored due to insufficient privilege");
3087
3088 if (lxc_create_network_unpriv_exec(lxcpath, lxcname, netdev, pid, hooks_version))
3089 return -1;
3090 }
3091
3092 return 0;
3093 }
3094
3095 bool lxc_delete_network_priv(struct lxc_handler *handler)
3096 {
3097 int ret;
3098 struct lxc_list *iterator;
3099 struct lxc_list *network = &handler->conf->network;
3100
3101 lxc_list_for_each(iterator, network) {
3102 char *hostveth = NULL;
3103 struct lxc_netdev *netdev = iterator->elem;
3104
3105 /* We can only delete devices whose ifindex we have. If we don't
3106 * have the index it means that we didn't create it.
3107 */
3108 if (!netdev->ifindex)
3109 continue;
3110
3111 /* Delete l2proxy entries if enabled and used with a link property */
3112 if (netdev->l2proxy && netdev->link[0] != '\0') {
3113 if (lxc_delete_l2proxy(netdev))
3114 WARN("Failed to delete all l2proxy config");
3115 /* Don't return, let the network be cleaned up as normal. */
3116 }
3117
3118 if (netdev->type == LXC_NET_PHYS) {
3119 ret = lxc_netdev_rename_by_index(netdev->ifindex, netdev->link);
3120 if (ret < 0)
3121 WARN("Failed to rename interface with index %d "
3122 "from \"%s\" to its initial name \"%s\"",
3123 netdev->ifindex, netdev->name, netdev->link);
3124 else
3125 TRACE("Renamed interface with index %d from "
3126 "\"%s\" to its initial name \"%s\"",
3127 netdev->ifindex, netdev->name,
3128 netdev->link);
3129 goto clear_ifindices;
3130 }
3131
3132 ret = netdev_deconf[netdev->type](handler, netdev);
3133 if (ret < 0)
3134 WARN("Failed to deconfigure network device");
3135
3136 /* Recent kernels remove the virtual interfaces when the network
3137 * namespace is destroyed but in case we did not move the
3138 * interface to the network namespace, we have to destroy it.
3139 */
3140 ret = lxc_netdev_delete_by_index(netdev->ifindex);
3141 if (ret < 0) {
3142 if (errno != ENODEV) {
3143 WARN("Failed to remove interface \"%s\" with index %d",
3144 netdev->name[0] != '\0' ? netdev->name : "(null)",
3145 netdev->ifindex);
3146 goto clear_ifindices;
3147 }
3148 INFO("Interface \"%s\" with index %d already deleted or existing in different network namespace",
3149 netdev->name[0] != '\0' ? netdev->name : "(null)",
3150 netdev->ifindex);
3151 }
3152 INFO("Removed interface \"%s\" with index %d",
3153 netdev->name[0] != '\0' ? netdev->name : "(null)",
3154 netdev->ifindex);
3155
3156 if (netdev->type != LXC_NET_VETH)
3157 goto clear_ifindices;
3158
3159 /* Explicitly delete host veth device to prevent lingering
3160 * devices. We had issues in LXD around this.
3161 */
3162 if (netdev->priv.veth_attr.pair[0] != '\0')
3163 hostveth = netdev->priv.veth_attr.pair;
3164 else
3165 hostveth = netdev->priv.veth_attr.veth1;
3166 if (hostveth[0] == '\0')
3167 goto clear_ifindices;
3168
3169 ret = lxc_netdev_delete_by_name(hostveth);
3170 if (ret < 0) {
3171 WARN("Failed to remove interface \"%s\" from \"%s\"",
3172 hostveth, netdev->link);
3173 goto clear_ifindices;
3174 }
3175 INFO("Removed interface \"%s\" from \"%s\"", hostveth, netdev->link);
3176
3177 if (netdev->link[0] == '\0' || !is_ovs_bridge(netdev->link)) {
3178 netdev->priv.veth_attr.veth1[0] = '\0';
3179 netdev->ifindex = 0;
3180 netdev->priv.veth_attr.ifindex = 0;
3181 goto clear_ifindices;
3182 }
3183
3184 /* Delete the openvswitch port. */
3185 ret = lxc_ovs_delete_port(netdev->link, hostveth);
3186 if (ret < 0)
3187 WARN("Failed to remove port \"%s\" from openvswitch "
3188 "bridge \"%s\"", hostveth, netdev->link);
3189 else
3190 INFO("Removed port \"%s\" from openvswitch bridge \"%s\"",
3191 hostveth, netdev->link);
3192
3193 clear_ifindices:
3194 /* We need to clear any ifindices we recorded so liblxc won't
3195 * have cached stale data which would cause it to fail on reboot
3196 * we're we don't re-read the on-disk config file.
3197 */
3198 netdev->ifindex = 0;
3199 if (netdev->type == LXC_NET_PHYS) {
3200 netdev->priv.phys_attr.ifindex = 0;
3201 } else if (netdev->type == LXC_NET_VETH) {
3202 netdev->priv.veth_attr.veth1[0] = '\0';
3203 netdev->priv.veth_attr.ifindex = 0;
3204 }
3205 }
3206
3207 return true;
3208 }
3209
3210 int lxc_requests_empty_network(struct lxc_handler *handler)
3211 {
3212 struct lxc_list *network = &handler->conf->network;
3213 struct lxc_list *iterator;
3214 bool found_none = false, found_nic = false;
3215
3216 if (lxc_list_empty(network))
3217 return 0;
3218
3219 lxc_list_for_each(iterator, network) {
3220 struct lxc_netdev *netdev = iterator->elem;
3221
3222 if (netdev->type == LXC_NET_NONE)
3223 found_none = true;
3224 else
3225 found_nic = true;
3226 }
3227 if (found_none && !found_nic)
3228 return 1;
3229 return 0;
3230 }
3231
3232 /* try to move physical nics to the init netns */
3233 int lxc_restore_phys_nics_to_netns(struct lxc_handler *handler)
3234 {
3235 int ret;
3236 int oldfd;
3237 char ifname[IFNAMSIZ];
3238 struct lxc_list *iterator;
3239 int netnsfd = handler->nsfd[LXC_NS_NET];
3240 struct lxc_conf *conf = handler->conf;
3241
3242 /* We need CAP_NET_ADMIN in the parent namespace in order to setns() to
3243 * the parent network namespace. We won't have this capability if we are
3244 * unprivileged.
3245 */
3246 if (!handler->am_root)
3247 return 0;
3248
3249 TRACE("Moving physical network devices back to parent network namespace");
3250
3251 oldfd = lxc_preserve_ns(lxc_raw_getpid(), "net");
3252 if (oldfd < 0) {
3253 SYSERROR("Failed to preserve network namespace");
3254 return -1;
3255 }
3256
3257 ret = setns(netnsfd, CLONE_NEWNET);
3258 if (ret < 0) {
3259 SYSERROR("Failed to enter network namespace");
3260 close(oldfd);
3261 return -1;
3262 }
3263
3264 lxc_list_for_each(iterator, &conf->network) {
3265 struct lxc_netdev *netdev = iterator->elem;
3266
3267 if (netdev->type != LXC_NET_PHYS)
3268 continue;
3269
3270 /* Retrieve the name of the interface in the container's network
3271 * namespace.
3272 */
3273 if (!if_indextoname(netdev->ifindex, ifname)) {
3274 WARN("No interface corresponding to ifindex %d",
3275 netdev->ifindex);
3276 continue;
3277 }
3278
3279 ret = lxc_netdev_move_by_name(ifname, 1, netdev->link);
3280 if (ret < 0)
3281 WARN("Error moving network device \"%s\" back to "
3282 "network namespace", ifname);
3283 else
3284 TRACE("Moved network device \"%s\" back to network "
3285 "namespace", ifname);
3286 }
3287
3288 ret = setns(oldfd, CLONE_NEWNET);
3289 close(oldfd);
3290 if (ret < 0) {
3291 SYSERROR("Failed to enter network namespace");
3292 return -1;
3293 }
3294
3295 return 0;
3296 }
3297
3298 static int setup_hw_addr(char *hwaddr, const char *ifname)
3299 {
3300 struct sockaddr sockaddr;
3301 struct ifreq ifr;
3302 int ret, fd;
3303
3304 ret = lxc_convert_mac(hwaddr, &sockaddr);
3305 if (ret) {
3306 errno = -ret;
3307 SYSERROR("Mac address \"%s\" conversion failed", hwaddr);
3308 return -1;
3309 }
3310
3311 memcpy(ifr.ifr_name, ifname, IFNAMSIZ);
3312 ifr.ifr_name[IFNAMSIZ-1] = '\0';
3313 memcpy((char *) &ifr.ifr_hwaddr, (char *) &sockaddr, sizeof(sockaddr));
3314
3315 fd = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
3316 if (fd < 0)
3317 return -1;
3318
3319 ret = ioctl(fd, SIOCSIFHWADDR, &ifr);
3320 if (ret)
3321 SYSERROR("Failed to perform ioctl");
3322
3323 close(fd);
3324
3325 DEBUG("Mac address \"%s\" on \"%s\" has been setup", hwaddr,
3326 ifr.ifr_name);
3327
3328 return ret;
3329 }
3330
3331 static int setup_ipv4_addr(struct lxc_list *ip, int ifindex)
3332 {
3333 struct lxc_list *iterator;
3334 int err;
3335
3336 lxc_list_for_each(iterator, ip) {
3337 struct lxc_inetdev *inetdev = iterator->elem;
3338
3339 err = lxc_ipv4_addr_add(ifindex, &inetdev->addr,
3340 &inetdev->bcast, inetdev->prefix);
3341 if (err) {
3342 errno = -err;
3343 SYSERROR("Failed to setup ipv4 address for network device "
3344 "with ifindex %d", ifindex);
3345 return -1;
3346 }
3347 }
3348
3349 return 0;
3350 }
3351
3352 static int setup_ipv6_addr(struct lxc_list *ip, int ifindex)
3353 {
3354 struct lxc_list *iterator;
3355 int err;
3356
3357 lxc_list_for_each(iterator, ip) {
3358 struct lxc_inet6dev *inet6dev = iterator->elem;
3359
3360 err = lxc_ipv6_addr_add(ifindex, &inet6dev->addr,
3361 &inet6dev->mcast, &inet6dev->acast,
3362 inet6dev->prefix);
3363 if (err) {
3364 errno = -err;
3365 SYSERROR("Failed to setup ipv6 address for network device "
3366 "with ifindex %d", ifindex);
3367 return -1;
3368 }
3369 }
3370
3371 return 0;
3372 }
3373
3374 static int lxc_setup_netdev_in_child_namespaces(struct lxc_netdev *netdev)
3375 {
3376 char ifname[IFNAMSIZ];
3377 int err;
3378 const char *net_type_name;
3379 char *current_ifname = ifname;
3380
3381 /* empty network namespace */
3382 if (!netdev->ifindex) {
3383 if (netdev->flags & IFF_UP) {
3384 err = lxc_netdev_up("lo");
3385 if (err) {
3386 errno = -err;
3387 SYSERROR("Failed to set the loopback network device up");
3388 return -1;
3389 }
3390 }
3391
3392 if (netdev->type == LXC_NET_EMPTY)
3393 return 0;
3394
3395 if (netdev->type == LXC_NET_NONE)
3396 return 0;
3397
3398 if (netdev->type != LXC_NET_VETH) {
3399 net_type_name = lxc_net_type_to_str(netdev->type);
3400 ERROR("%s networks are not supported for containers "
3401 "not setup up by privileged users", net_type_name);
3402 return -1;
3403 }
3404
3405 netdev->ifindex = if_nametoindex(netdev->name);
3406 }
3407
3408 /* get the new ifindex in case of physical netdev */
3409 if (netdev->type == LXC_NET_PHYS) {
3410 netdev->ifindex = if_nametoindex(netdev->link);
3411 if (!netdev->ifindex) {
3412 ERROR("Failed to get ifindex for network device \"%s\"",
3413 netdev->link);
3414 return -1;
3415 }
3416 }
3417
3418 /* retrieve the name of the interface */
3419 if (!if_indextoname(netdev->ifindex, current_ifname)) {
3420 ERROR("Failed get name for network device with ifindex %d",
3421 netdev->ifindex);
3422 return -1;
3423 }
3424
3425 /* Default: let the system to choose one interface name.
3426 * When the IFLA_IFNAME attribute is passed something like "<prefix>%d"
3427 * netlink will replace the format specifier with an appropriate index.
3428 */
3429 if (netdev->name[0] == '\0') {
3430 if (netdev->type == LXC_NET_PHYS)
3431 (void)strlcpy(netdev->name, netdev->link, IFNAMSIZ);
3432 else
3433 (void)strlcpy(netdev->name, "eth%d", IFNAMSIZ);
3434 }
3435
3436 /* rename the interface name */
3437 if (strcmp(ifname, netdev->name) != 0) {
3438 err = lxc_netdev_rename_by_name(ifname, netdev->name);
3439 if (err) {
3440 errno = -err;
3441 SYSERROR("Failed to rename network device \"%s\" to \"%s\"",
3442 ifname, netdev->name);
3443 return -1;
3444 }
3445 }
3446
3447 /* Re-read the name of the interface because its name has changed
3448 * and would be automatically allocated by the system
3449 */
3450 if (!if_indextoname(netdev->ifindex, current_ifname)) {
3451 ERROR("Failed get name for network device with ifindex %d",
3452 netdev->ifindex);
3453 return -1;
3454 }
3455
3456 /* Now update the recorded name of the network device to reflect the
3457 * name of the network device in the child's network namespace. We will
3458 * later on send this information back to the parent.
3459 */
3460 (void)strlcpy(netdev->name, current_ifname, IFNAMSIZ);
3461
3462 /* set a mac address */
3463 if (netdev->hwaddr) {
3464 if (setup_hw_addr(netdev->hwaddr, current_ifname)) {
3465 ERROR("Failed to setup hw address for network device \"%s\"",
3466 current_ifname);
3467 return -1;
3468 }
3469 }
3470
3471 /* setup ipv4 addresses on the interface */
3472 if (setup_ipv4_addr(&netdev->ipv4, netdev->ifindex)) {
3473 ERROR("Failed to setup ip addresses for network device \"%s\"",
3474 ifname);
3475 return -1;
3476 }
3477
3478 /* setup ipv6 addresses on the interface */
3479 if (setup_ipv6_addr(&netdev->ipv6, netdev->ifindex)) {
3480 ERROR("Failed to setup ipv6 addresses for network device \"%s\"",
3481 ifname);
3482 return -1;
3483 }
3484
3485 /* set the network device up */
3486 if (netdev->flags & IFF_UP) {
3487 err = lxc_netdev_up(current_ifname);
3488 if (err) {
3489 errno = -err;
3490 SYSERROR("Failed to set network device \"%s\" up",
3491 current_ifname);
3492 return -1;
3493 }
3494
3495 /* the network is up, make the loopback up too */
3496 err = lxc_netdev_up("lo");
3497 if (err) {
3498 errno = -err;
3499 SYSERROR("Failed to set the loopback network device up");
3500 return -1;
3501 }
3502 }
3503
3504 /* We can only set up the default routes after bringing
3505 * up the interface, since bringing up the interface adds
3506 * the link-local routes and we can't add a default
3507 * route if the gateway is not reachable. */
3508
3509 /* setup ipv4 gateway on the interface */
3510 if (netdev->ipv4_gateway || netdev->ipv4_gateway_dev) {
3511 if (!(netdev->flags & IFF_UP)) {
3512 ERROR("Cannot add ipv4 gateway for network device "
3513 "\"%s\" when not bringing up the interface", ifname);
3514 return -1;
3515 }
3516
3517 if (lxc_list_empty(&netdev->ipv4)) {
3518 ERROR("Cannot add ipv4 gateway for network device "
3519 "\"%s\" when not assigning an address", ifname);
3520 return -1;
3521 }
3522
3523 /* Setup device route if ipv4_gateway_dev is enabled */
3524 if (netdev->ipv4_gateway_dev) {
3525 err = lxc_ipv4_gateway_add(netdev->ifindex, NULL);
3526 if (err < 0) {
3527 SYSERROR("Failed to setup ipv4 gateway to network device \"%s\"",
3528 ifname);
3529 return minus_one_set_errno(-err);
3530 }
3531 } else {
3532 err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway);
3533 if (err) {
3534 err = lxc_ipv4_dest_add(netdev->ifindex, netdev->ipv4_gateway, 32);
3535 if (err) {
3536 errno = -err;
3537 SYSERROR("Failed to add ipv4 dest for network device \"%s\"",
3538 ifname);
3539 }
3540
3541 err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway);
3542 if (err) {
3543 errno = -err;
3544 SYSERROR("Failed to setup ipv4 gateway for network device \"%s\"",
3545 ifname);
3546
3547 if (netdev->ipv4_gateway_auto) {
3548 char buf[INET_ADDRSTRLEN];
3549 inet_ntop(AF_INET, netdev->ipv4_gateway, buf, sizeof(buf));
3550 ERROR("Tried to set autodetected ipv4 gateway \"%s\"", buf);
3551 }
3552 return -1;
3553 }
3554 }
3555 }
3556 }
3557
3558 /* setup ipv6 gateway on the interface */
3559 if (netdev->ipv6_gateway || netdev->ipv6_gateway_dev) {
3560 if (!(netdev->flags & IFF_UP)) {
3561 ERROR("Cannot add ipv6 gateway for network device "
3562 "\"%s\" when not bringing up the interface", ifname);
3563 return -1;
3564 }
3565
3566 if (lxc_list_empty(&netdev->ipv6) && !IN6_IS_ADDR_LINKLOCAL(netdev->ipv6_gateway)) {
3567 ERROR("Cannot add ipv6 gateway for network device "
3568 "\"%s\" when not assigning an address", ifname);
3569 return -1;
3570 }
3571
3572 /* Setup device route if ipv6_gateway_dev is enabled */
3573 if (netdev->ipv6_gateway_dev) {
3574 err = lxc_ipv6_gateway_add(netdev->ifindex, NULL);
3575 if (err < 0) {
3576 SYSERROR("Failed to setup ipv6 gateway to network device \"%s\"",
3577 ifname);
3578 return minus_one_set_errno(-err);
3579 }
3580 } else {
3581 err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway);
3582 if (err) {
3583 err = lxc_ipv6_dest_add(netdev->ifindex, netdev->ipv6_gateway, 128);
3584 if (err) {
3585 errno = -err;
3586 SYSERROR("Failed to add ipv6 dest for network device \"%s\"",
3587 ifname);
3588 }
3589
3590 err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway);
3591 if (err) {
3592 errno = -err;
3593 SYSERROR("Failed to setup ipv6 gateway for network device \"%s\"",
3594 ifname);
3595
3596 if (netdev->ipv6_gateway_auto) {
3597 char buf[INET6_ADDRSTRLEN];
3598 inet_ntop(AF_INET6, netdev->ipv6_gateway, buf, sizeof(buf));
3599 ERROR("Tried to set autodetected ipv6 "
3600 "gateway for network device "
3601 "\"%s\"", buf);
3602 }
3603 return -1;
3604 }
3605 }
3606 }
3607 }
3608
3609 DEBUG("Network device \"%s\" has been setup", current_ifname);
3610
3611 return 0;
3612 }
3613
3614 int lxc_setup_network_in_child_namespaces(const struct lxc_conf *conf,
3615 struct lxc_list *network)
3616 {
3617 struct lxc_list *iterator;
3618 struct lxc_netdev *netdev;
3619
3620 lxc_list_for_each(iterator, network) {
3621 netdev = iterator->elem;
3622
3623 if (lxc_setup_netdev_in_child_namespaces(netdev)) {
3624 ERROR("failed to setup netdev");
3625 return -1;
3626 }
3627 }
3628
3629 if (!lxc_list_empty(network))
3630 INFO("network has been setup");
3631
3632 return 0;
3633 }
3634
3635 int lxc_network_send_veth_names_to_child(struct lxc_handler *handler)
3636 {
3637 struct lxc_list *iterator;
3638 struct lxc_list *network = &handler->conf->network;
3639 int data_sock = handler->data_sock[0];
3640
3641 if (handler->am_root)
3642 return 0;
3643
3644 lxc_list_for_each(iterator, network) {
3645 int ret;
3646 struct lxc_netdev *netdev = iterator->elem;
3647
3648 if (netdev->type != LXC_NET_VETH)
3649 continue;
3650
3651 ret = lxc_send_nointr(data_sock, netdev->name, IFNAMSIZ, MSG_NOSIGNAL);
3652 if (ret < 0)
3653 return -1;
3654 TRACE("Sent network device name \"%s\" to child", netdev->name);
3655 }
3656
3657 return 0;
3658 }
3659
3660 int lxc_network_recv_veth_names_from_parent(struct lxc_handler *handler)
3661 {
3662 struct lxc_list *iterator;
3663 struct lxc_list *network = &handler->conf->network;
3664 int data_sock = handler->data_sock[1];
3665
3666 if (handler->am_root)
3667 return 0;
3668
3669 lxc_list_for_each(iterator, network) {
3670 int ret;
3671 struct lxc_netdev *netdev = iterator->elem;
3672
3673 if (netdev->type != LXC_NET_VETH)
3674 continue;
3675
3676 ret = lxc_recv_nointr(data_sock, netdev->name, IFNAMSIZ, 0);
3677 if (ret < 0)
3678 return -1;
3679 TRACE("Received network device name \"%s\" from parent", netdev->name);
3680 }
3681
3682 return 0;
3683 }
3684
3685 int lxc_network_send_name_and_ifindex_to_parent(struct lxc_handler *handler)
3686 {
3687 struct lxc_list *iterator, *network;
3688 int data_sock = handler->data_sock[0];
3689
3690 if (!handler->am_root)
3691 return 0;
3692
3693 network = &handler->conf->network;
3694 lxc_list_for_each(iterator, network) {
3695 int ret;
3696 struct lxc_netdev *netdev = iterator->elem;
3697
3698 /* Send network device name in the child's namespace to parent. */
3699 ret = lxc_send_nointr(data_sock, netdev->name, IFNAMSIZ, MSG_NOSIGNAL);
3700 if (ret < 0)
3701 return -1;
3702
3703 /* Send network device ifindex in the child's namespace to
3704 * parent.
3705 */
3706 ret = lxc_send_nointr(data_sock, &netdev->ifindex, sizeof(netdev->ifindex), MSG_NOSIGNAL);
3707 if (ret < 0)
3708 return -1;
3709 }
3710
3711 TRACE("Sent network device names and ifindices to parent");
3712 return 0;
3713 }
3714
3715 int lxc_network_recv_name_and_ifindex_from_child(struct lxc_handler *handler)
3716 {
3717 struct lxc_list *iterator, *network;
3718 int data_sock = handler->data_sock[1];
3719
3720 if (!handler->am_root)
3721 return 0;
3722
3723 network = &handler->conf->network;
3724 lxc_list_for_each(iterator, network) {
3725 int ret;
3726 struct lxc_netdev *netdev = iterator->elem;
3727
3728 /* Receive network device name in the child's namespace to
3729 * parent.
3730 */
3731 ret = lxc_recv_nointr(data_sock, netdev->name, IFNAMSIZ, 0);
3732 if (ret < 0)
3733 return -1;
3734
3735 /* Receive network device ifindex in the child's namespace to
3736 * parent.
3737 */
3738 ret = lxc_recv_nointr(data_sock, &netdev->ifindex, sizeof(netdev->ifindex), 0);
3739 if (ret < 0)
3740 return -1;
3741 }
3742
3743 return 0;
3744 }
3745
3746 void lxc_delete_network(struct lxc_handler *handler)
3747 {
3748 bool bret;
3749
3750 if (handler->am_root)
3751 bret = lxc_delete_network_priv(handler);
3752 else
3753 bret = lxc_delete_network_unpriv(handler);
3754 if (!bret)
3755 DEBUG("Failed to delete network devices");
3756 else
3757 DEBUG("Deleted network devices");
3758 }
3759
3760 int lxc_netns_set_nsid(int fd)
3761 {
3762 int ret;
3763 char buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
3764 NLMSG_ALIGN(sizeof(struct rtgenmsg)) +
3765 NLMSG_ALIGN(1024)];
3766 struct nl_handler nlh;
3767 struct nlmsghdr *hdr;
3768 struct rtgenmsg *msg;
3769 int saved_errno;
3770 const __s32 ns_id = -1;
3771 const __u32 netns_fd = fd;
3772
3773 ret = netlink_open(&nlh, NETLINK_ROUTE);
3774 if (ret < 0)
3775 return -1;
3776
3777 memset(buf, 0, sizeof(buf));
3778
3779 #pragma GCC diagnostic push
3780 #pragma GCC diagnostic ignored "-Wcast-align"
3781 hdr = (struct nlmsghdr *)buf;
3782 msg = (struct rtgenmsg *)NLMSG_DATA(hdr);
3783 #pragma GCC diagnostic pop
3784
3785 hdr->nlmsg_len = NLMSG_LENGTH(sizeof(*msg));
3786 hdr->nlmsg_type = RTM_NEWNSID;
3787 hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
3788 hdr->nlmsg_pid = 0;
3789 hdr->nlmsg_seq = RTM_NEWNSID;
3790 msg->rtgen_family = AF_UNSPEC;
3791
3792 ret = addattr(hdr, 1024, __LXC_NETNSA_FD, &netns_fd, sizeof(netns_fd));
3793 if (ret < 0)
3794 goto on_error;
3795
3796 ret = addattr(hdr, 1024, __LXC_NETNSA_NSID, &ns_id, sizeof(ns_id));
3797 if (ret < 0)
3798 goto on_error;
3799
3800 ret = __netlink_transaction(&nlh, hdr, hdr);
3801
3802 on_error:
3803 saved_errno = errno;
3804 netlink_close(&nlh);
3805 errno = saved_errno;
3806
3807 return ret;
3808 }
3809
3810 static int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len)
3811 {
3812
3813 memset(tb, 0, sizeof(struct rtattr *) * (max + 1));
3814
3815 while (RTA_OK(rta, len)) {
3816 unsigned short type = rta->rta_type;
3817
3818 if ((type <= max) && (!tb[type]))
3819 tb[type] = rta;
3820
3821 #pragma GCC diagnostic push
3822 #pragma GCC diagnostic ignored "-Wcast-align"
3823 rta = RTA_NEXT(rta, len);
3824 #pragma GCC diagnostic pop
3825 }
3826
3827 return 0;
3828 }
3829
3830 static inline __s32 rta_getattr_s32(const struct rtattr *rta)
3831 {
3832 return *(__s32 *)RTA_DATA(rta);
3833 }
3834
3835 #ifndef NETNS_RTA
3836 #define NETNS_RTA(r) \
3837 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))))
3838 #endif
3839
3840 int lxc_netns_get_nsid(int fd)
3841 {
3842 int ret;
3843 ssize_t len;
3844 char buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
3845 NLMSG_ALIGN(sizeof(struct rtgenmsg)) +
3846 NLMSG_ALIGN(1024)];
3847 struct rtattr *tb[__LXC_NETNSA_MAX + 1];
3848 struct nl_handler nlh;
3849 struct nlmsghdr *hdr;
3850 struct rtgenmsg *msg;
3851 int saved_errno;
3852 __u32 netns_fd = fd;
3853
3854 ret = netlink_open(&nlh, NETLINK_ROUTE);
3855 if (ret < 0)
3856 return -1;
3857
3858 memset(buf, 0, sizeof(buf));
3859
3860 #pragma GCC diagnostic push
3861 #pragma GCC diagnostic ignored "-Wcast-align"
3862 hdr = (struct nlmsghdr *)buf;
3863 msg = (struct rtgenmsg *)NLMSG_DATA(hdr);
3864 #pragma GCC diagnostic pop
3865
3866 hdr->nlmsg_len = NLMSG_LENGTH(sizeof(*msg));
3867 hdr->nlmsg_type = RTM_GETNSID;
3868 hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
3869 hdr->nlmsg_pid = 0;
3870 hdr->nlmsg_seq = RTM_GETNSID;
3871 msg->rtgen_family = AF_UNSPEC;
3872
3873 ret = addattr(hdr, 1024, __LXC_NETNSA_FD, &netns_fd, sizeof(netns_fd));
3874 if (ret == 0)
3875 ret = __netlink_transaction(&nlh, hdr, hdr);
3876
3877 saved_errno = errno;
3878 netlink_close(&nlh);
3879 errno = saved_errno;
3880 if (ret < 0)
3881 return -1;
3882
3883 errno = EINVAL;
3884 msg = NLMSG_DATA(hdr);
3885 len = hdr->nlmsg_len - NLMSG_SPACE(sizeof(*msg));
3886 if (len < 0)
3887 return -1;
3888
3889 #pragma GCC diagnostic push
3890 #pragma GCC diagnostic ignored "-Wcast-align"
3891 parse_rtattr(tb, __LXC_NETNSA_MAX, NETNS_RTA(msg), len);
3892 if (tb[__LXC_NETNSA_NSID])
3893 return rta_getattr_s32(tb[__LXC_NETNSA_NSID]);
3894 #pragma GCC diagnostic pop
3895
3896 return -1;
3897 }
LXC mirror