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tree-wide: remove Lennart's copyright lines
[thirdparty/systemd.git] / src / nspawn / nspawn-network.c
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53e1b683 1/* SPDX-License-Identifier: LGPL-2.1+ */
9a2a5625
LP		 2
3#include <linux/veth.h>
4#include <net/if.h>
fe993888 5#include <sys/file.h>
9a2a5625 6
b4bbcaa9 7#include "libudev.h"
9a2a5625
LP		 8#include "sd-id128.h"
9#include "sd-netlink.h"
9a2a5625 10
b5efdb8a 11#include "alloc-util.h"
9a2a5625 12#include "ether-addr-util.h"
22b28dfd 13#include "lockfile-util.h"
9a2a5625 14#include "netlink-util.h"
cf0fbc49 15#include "nspawn-network.h"
07630cea 16#include "siphash24.h"
ef76dff2
LP		 17#include "socket-util.h"
18#include "stat-util.h"
07630cea 19#include "string-util.h"
9a2a5625 20#include "udev-util.h"
07630cea 21#include "util.h"
9a2a5625
LP		 22
23#define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1)
24#define CONTAINER_HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2)
f6d6bad1
LP		 25#define VETH_EXTRA_HOST_HASH_KEY SD_ID128_MAKE(48,c7,f6,b7,ea,9d,4c,9e,b7,28,d4,de,91,d5,bf,66)
26#define VETH_EXTRA_CONTAINER_HASH_KEY SD_ID128_MAKE(af,50,17,61,ce,f9,4d,35,84,0d,2b,20,54,be,ce,59)
9a2a5625
LP		 27#define MACVLAN_HASH_KEY SD_ID128_MAKE(00,13,6d,bc,66,83,44,81,bb,0c,f9,51,1f,24,a6,6f)
28
22b28dfd
LP		 29static int remove_one_link(sd_netlink *rtnl, const char *name) {
30 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
31 int r;
32
33 if (isempty(name))
34 return 0;
35
36 r = sd_rtnl_message_new_link(rtnl, &m, RTM_DELLINK, 0);
37 if (r < 0)
38 return log_error_errno(r, "Failed to allocate netlink message: %m");
39
40 r = sd_netlink_message_append_string(m, IFLA_IFNAME, name);
41 if (r < 0)
42 return log_error_errno(r, "Failed to add netlink interface name: %m");
43
44 r = sd_netlink_call(rtnl, m, 0, NULL);
45 if (r == -ENODEV) /* Already gone */
46 return 0;
47 if (r < 0)
48 return log_error_errno(r, "Failed to remove interface %s: %m", name);
49
50 return 1;
51}
52
9a2a5625
LP		 53static int generate_mac(
54 const char *machine_name,
55 struct ether_addr *mac,
56 sd_id128_t hash_key,
57 uint64_t idx) {
58
dbe81cbd 59 uint64_t result;
9a2a5625
LP		 60 size_t l, sz;
61 uint8_t *v, *i;
62 int r;
63
64 l = strlen(machine_name);
65 sz = sizeof(sd_id128_t) + l;
66 if (idx > 0)
67 sz += sizeof(idx);
68
69 v = alloca(sz);
70
71 /* fetch some persistent data unique to the host */
72 r = sd_id128_get_machine((sd_id128_t*) v);
73 if (r < 0)
74 return r;
75
76 /* combine with some data unique (on this host) to this
77 * container instance */
78 i = mempcpy(v + sizeof(sd_id128_t), machine_name, l);
79 if (idx > 0) {
80 idx = htole64(idx);
81 memcpy(i, &idx, sizeof(idx));
82 }
83
84 /* Let's hash the host machine ID plus the container name. We
85 * use a fixed, but originally randomly created hash key here. */
933f9cae 86 result = htole64(siphash24(v, sz, hash_key.bytes));
9a2a5625
LP		 87
88 assert_cc(ETH_ALEN <= sizeof(result));
dbe81cbd 89 memcpy(mac->ether_addr_octet, &result, ETH_ALEN);
9a2a5625
LP		 90
91 /* see eth_random_addr in the kernel */
92 mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
93 mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
94
95 return 0;
96}
97
f6d6bad1
LP		 98static int add_veth(
99 sd_netlink *rtnl,
100 pid_t pid,
101 const char *ifname_host,
102 const struct ether_addr *mac_host,
103 const char *ifname_container,
104 const struct ether_addr *mac_container) {
9a2a5625 105
4afd3348 106 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
f6d6bad1 107 int r;
9a2a5625 108
f6d6bad1
LP		 109 assert(rtnl);
110 assert(ifname_host);
111 assert(mac_host);
112 assert(ifname_container);
113 assert(mac_container);
9a2a5625
LP		 114
115 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
116 if (r < 0)
117 return log_error_errno(r, "Failed to allocate netlink message: %m");
118
f6d6bad1 119 r = sd_netlink_message_append_string(m, IFLA_IFNAME, ifname_host);
9a2a5625
LP		 120 if (r < 0)
121 return log_error_errno(r, "Failed to add netlink interface name: %m");
122
f6d6bad1 123 r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, mac_host);
9a2a5625
LP		 124 if (r < 0)
125 return log_error_errno(r, "Failed to add netlink MAC address: %m");
126
127 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
128 if (r < 0)
129 return log_error_errno(r, "Failed to open netlink container: %m");
130
131 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "veth");
132 if (r < 0)
133 return log_error_errno(r, "Failed to open netlink container: %m");
134
135 r = sd_netlink_message_open_container(m, VETH_INFO_PEER);
136 if (r < 0)
137 return log_error_errno(r, "Failed to open netlink container: %m");
138
f6d6bad1 139 r = sd_netlink_message_append_string(m, IFLA_IFNAME, ifname_container);
9a2a5625
LP		 140 if (r < 0)
141 return log_error_errno(r, "Failed to add netlink interface name: %m");
142
f6d6bad1 143 r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, mac_container);
9a2a5625
LP		 144 if (r < 0)
145 return log_error_errno(r, "Failed to add netlink MAC address: %m");
146
147 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
148 if (r < 0)
149 return log_error_errno(r, "Failed to add netlink namespace field: %m");
150
151 r = sd_netlink_message_close_container(m);
152 if (r < 0)
153 return log_error_errno(r, "Failed to close netlink container: %m");
154
155 r = sd_netlink_message_close_container(m);
156 if (r < 0)
157 return log_error_errno(r, "Failed to close netlink container: %m");
158
159 r = sd_netlink_message_close_container(m);
160 if (r < 0)
161 return log_error_errno(r, "Failed to close netlink container: %m");
162
163 r = sd_netlink_call(rtnl, m, 0, NULL);
164 if (r < 0)
f6d6bad1
LP		 165 return log_error_errno(r, "Failed to add new veth interfaces (%s:%s): %m", ifname_host, ifname_container);
166
167 return 0;
168}
169
170int setup_veth(const char *machine_name,
171 pid_t pid,
172 char iface_name[IFNAMSIZ],
173 bool bridge) {
174
4afd3348 175 _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
f6d6bad1
LP		 176 struct ether_addr mac_host, mac_container;
177 int r, i;
178
179 assert(machine_name);
180 assert(pid > 0);
181 assert(iface_name);
182
183 /* Use two different interface name prefixes depending whether
184 * we are in bridge mode or not. */
185 snprintf(iface_name, IFNAMSIZ - 1, "%s-%s",
186 bridge ? "vb" : "ve", machine_name);
187
188 r = generate_mac(machine_name, &mac_container, CONTAINER_HASH_KEY, 0);
189 if (r < 0)
190 return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m");
191
192 r = generate_mac(machine_name, &mac_host, HOST_HASH_KEY, 0);
193 if (r < 0)
194 return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m");
195
196 r = sd_netlink_open(&rtnl);
197 if (r < 0)
198 return log_error_errno(r, "Failed to connect to netlink: %m");
199
200 r = add_veth(rtnl, pid, iface_name, &mac_host, "host0", &mac_container);
201 if (r < 0)
202 return r;
9a2a5625
LP		 203
204 i = (int) if_nametoindex(iface_name);
205 if (i <= 0)
206 return log_error_errno(errno, "Failed to resolve interface %s: %m", iface_name);
207
208 return i;
209}
210
f6d6bad1
LP		 211int setup_veth_extra(
212 const char *machine_name,
213 pid_t pid,
214 char **pairs) {
215
4afd3348 216 _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
f6d6bad1
LP		 217 uint64_t idx = 0;
218 char **a, **b;
219 int r;
220
221 assert(machine_name);
222 assert(pid > 0);
223
224 if (strv_isempty(pairs))
225 return 0;
226
227 r = sd_netlink_open(&rtnl);
228 if (r < 0)
229 return log_error_errno(r, "Failed to connect to netlink: %m");
230
231 STRV_FOREACH_PAIR(a, b, pairs) {
232 struct ether_addr mac_host, mac_container;
233
234 r = generate_mac(machine_name, &mac_container, VETH_EXTRA_CONTAINER_HASH_KEY, idx);
235 if (r < 0)
236 return log_error_errno(r, "Failed to generate predictable MAC address for container side of extra veth link: %m");
237
238 r = generate_mac(machine_name, &mac_host, VETH_EXTRA_HOST_HASH_KEY, idx);
239 if (r < 0)
240 return log_error_errno(r, "Failed to generate predictable MAC address for container side of extra veth link: %m");
241
242 r = add_veth(rtnl, pid, *a, &mac_host, *b, &mac_container);
243 if (r < 0)
244 return r;
245
313cefa1 246 idx++;
f6d6bad1
LP		 247 }
248
249 return 0;
250}
251
22b28dfd 252static int join_bridge(sd_netlink *rtnl, const char *veth_name, const char *bridge_name) {
4afd3348 253 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
9a2a5625
LP		 254 int r, bridge_ifi;
255
22b28dfd 256 assert(rtnl);
9a2a5625
LP		 257 assert(veth_name);
258 assert(bridge_name);
259
260 bridge_ifi = (int) if_nametoindex(bridge_name);
261 if (bridge_ifi <= 0)
22b28dfd 262 return -errno;
9a2a5625
LP		 263
264 r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0);
265 if (r < 0)
22b28dfd 266 return r;
9a2a5625
LP		 267
268 r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP);
269 if (r < 0)
22b28dfd 270 return r;
9a2a5625
LP		 271
272 r = sd_netlink_message_append_string(m, IFLA_IFNAME, veth_name);
273 if (r < 0)
22b28dfd 274 return r;
9a2a5625
LP		 275
276 r = sd_netlink_message_append_u32(m, IFLA_MASTER, bridge_ifi);
277 if (r < 0)
22b28dfd 278 return r;
9a2a5625
LP		 279
280 r = sd_netlink_call(rtnl, m, 0, NULL);
281 if (r < 0)
22b28dfd 282 return r;
9a2a5625
LP		 283
284 return bridge_ifi;
285}
286
22b28dfd
LP		 287static int create_bridge(sd_netlink *rtnl, const char *bridge_name) {
288 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
289 int r;
290
291 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
292 if (r < 0)
293 return r;
294
295 r = sd_netlink_message_append_string(m, IFLA_IFNAME, bridge_name);
296 if (r < 0)
297 return r;
298
299 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
300 if (r < 0)
301 return r;
302
303 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "bridge");
304 if (r < 0)
305 return r;
306
307 r = sd_netlink_message_close_container(m);
308 if (r < 0)
309 return r;
310
311 r = sd_netlink_message_close_container(m);
312 if (r < 0)
313 return r;
314
315 r = sd_netlink_call(rtnl, m, 0, NULL);
316 if (r < 0)
317 return r;
318
319 return 0;
320}
321
322int setup_bridge(const char *veth_name, const char *bridge_name, bool create) {
8e766630 323 _cleanup_(release_lock_file) LockFile bridge_lock = LOCK_FILE_INIT;
22b28dfd
LP		 324 _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
325 int r, bridge_ifi;
326 unsigned n = 0;
327
328 assert(veth_name);
329 assert(bridge_name);
330
331 r = sd_netlink_open(&rtnl);
332 if (r < 0)
333 return log_error_errno(r, "Failed to connect to netlink: %m");
334
335 if (create) {
336 /* We take a system-wide lock here, so that we can safely check whether there's still a member in the
6dd6a9c4 337 * bridge before removing it, without risking interference from other nspawn instances. */
22b28dfd
LP		 338
339 r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock);
340 if (r < 0)
341 return log_error_errno(r, "Failed to take network zone lock: %m");
342 }
343
344 for (;;) {
345 bridge_ifi = join_bridge(rtnl, veth_name, bridge_name);
346 if (bridge_ifi >= 0)
347 return bridge_ifi;
348 if (bridge_ifi != -ENODEV || !create || n > 10)
349 return log_error_errno(bridge_ifi, "Failed to add interface %s to bridge %s: %m", veth_name, bridge_name);
350
351 /* Count attempts, so that we don't enter an endless loop here. */
352 n++;
353
354 /* The bridge doesn't exist yet. Let's create it */
355 r = create_bridge(rtnl, bridge_name);
356 if (r < 0)
357 return log_error_errno(r, "Failed to create bridge interface %s: %m", bridge_name);
358
359 /* Try again, now that the bridge exists */
360 }
361}
362
363int remove_bridge(const char *bridge_name) {
8e766630 364 _cleanup_(release_lock_file) LockFile bridge_lock = LOCK_FILE_INIT;
22b28dfd
LP		 365 _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
366 const char *path;
367 int r;
368
369 /* Removes the specified bridge, but only if it is currently empty */
370
371 if (isempty(bridge_name))
372 return 0;
373
374 r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock);
375 if (r < 0)
376 return log_error_errno(r, "Failed to take network zone lock: %m");
377
378 path = strjoina("/sys/class/net/", bridge_name, "/brif");
379
380 r = dir_is_empty(path);
381 if (r == -ENOENT) /* Already gone? */
382 return 0;
383 if (r < 0)
384 return log_error_errno(r, "Can't detect if bridge %s is empty: %m", bridge_name);
385 if (r == 0) /* Still populated, leave it around */
386 return 0;
387
388 r = sd_netlink_open(&rtnl);
389 if (r < 0)
390 return log_error_errno(r, "Failed to connect to netlink: %m");
391
392 return remove_one_link(rtnl, bridge_name);
393}
394
9a2a5625 395static int parse_interface(struct udev *udev, const char *name) {
8e766630 396 _cleanup_(udev_device_unrefp) struct udev_device *d = NULL;
9a2a5625
LP		 397 char ifi_str[2 + DECIMAL_STR_MAX(int)];
398 int ifi;
399
400 ifi = (int) if_nametoindex(name);
401 if (ifi <= 0)
402 return log_error_errno(errno, "Failed to resolve interface %s: %m", name);
403
404 sprintf(ifi_str, "n%i", ifi);
405 d = udev_device_new_from_device_id(udev, ifi_str);
406 if (!d)
407 return log_error_errno(errno, "Failed to get udev device for interface %s: %m", name);
408
409 if (udev_device_get_is_initialized(d) <= 0) {
410 log_error("Network interface %s is not initialized yet.", name);
411 return -EBUSY;
412 }
413
414 return ifi;
415}
416
417int move_network_interfaces(pid_t pid, char **ifaces) {
8e766630 418 _cleanup_(udev_unrefp) struct udev *udev = NULL;
4afd3348 419 _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
9a2a5625
LP		 420 char **i;
421 int r;
422
423 if (strv_isempty(ifaces))
424 return 0;
425
426 r = sd_netlink_open(&rtnl);
427 if (r < 0)
428 return log_error_errno(r, "Failed to connect to netlink: %m");
429
430 udev = udev_new();
431 if (!udev) {
432 log_error("Failed to connect to udev.");
433 return -ENOMEM;
434 }
435
436 STRV_FOREACH(i, ifaces) {
4afd3348 437 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
9a2a5625
LP		 438 int ifi;
439
440 ifi = parse_interface(udev, *i);
441 if (ifi < 0)
442 return ifi;
443
444 r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi);
445 if (r < 0)
446 return log_error_errno(r, "Failed to allocate netlink message: %m");
447
448 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
449 if (r < 0)
450 return log_error_errno(r, "Failed to append namespace PID to netlink message: %m");
451
452 r = sd_netlink_call(rtnl, m, 0, NULL);
453 if (r < 0)
454 return log_error_errno(r, "Failed to move interface %s to namespace: %m", *i);
455 }
456
457 return 0;
458}
459
460int setup_macvlan(const char *machine_name, pid_t pid, char **ifaces) {
8e766630 461 _cleanup_(udev_unrefp) struct udev *udev = NULL;
4afd3348 462 _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
9a2a5625
LP		 463 unsigned idx = 0;
464 char **i;
465 int r;
466
467 if (strv_isempty(ifaces))
468 return 0;
469
470 r = sd_netlink_open(&rtnl);
471 if (r < 0)
472 return log_error_errno(r, "Failed to connect to netlink: %m");
473
474 udev = udev_new();
475 if (!udev) {
476 log_error("Failed to connect to udev.");
477 return -ENOMEM;
478 }
479
480 STRV_FOREACH(i, ifaces) {
4afd3348 481 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
9a2a5625
LP		 482 _cleanup_free_ char *n = NULL;
483 struct ether_addr mac;
484 int ifi;
485
486 ifi = parse_interface(udev, *i);
487 if (ifi < 0)
488 return ifi;
489
490 r = generate_mac(machine_name, &mac, MACVLAN_HASH_KEY, idx++);
491 if (r < 0)
492 return log_error_errno(r, "Failed to create MACVLAN MAC address: %m");
493
494 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
495 if (r < 0)
496 return log_error_errno(r, "Failed to allocate netlink message: %m");
497
498 r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
499 if (r < 0)
500 return log_error_errno(r, "Failed to add netlink interface index: %m");
501
502 n = strappend("mv-", *i);
503 if (!n)
504 return log_oom();
505
506 strshorten(n, IFNAMSIZ-1);
507
508 r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
509 if (r < 0)
510 return log_error_errno(r, "Failed to add netlink interface name: %m");
511
512 r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac);
513 if (r < 0)
514 return log_error_errno(r, "Failed to add netlink MAC address: %m");
515
516 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
517 if (r < 0)
518 return log_error_errno(r, "Failed to add netlink namespace field: %m");
519
520 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
521 if (r < 0)
522 return log_error_errno(r, "Failed to open netlink container: %m");
523
524 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "macvlan");
525 if (r < 0)
526 return log_error_errno(r, "Failed to open netlink container: %m");
527
528 r = sd_netlink_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE);
529 if (r < 0)
530 return log_error_errno(r, "Failed to append macvlan mode: %m");
531
532 r = sd_netlink_message_close_container(m);
533 if (r < 0)
534 return log_error_errno(r, "Failed to close netlink container: %m");
535
536 r = sd_netlink_message_close_container(m);
537 if (r < 0)
538 return log_error_errno(r, "Failed to close netlink container: %m");
539
540 r = sd_netlink_call(rtnl, m, 0, NULL);
541 if (r < 0)
542 return log_error_errno(r, "Failed to add new macvlan interfaces: %m");
543 }
544
545 return 0;
546}
547
548int setup_ipvlan(const char *machine_name, pid_t pid, char **ifaces) {
8e766630 549 _cleanup_(udev_unrefp) struct udev *udev = NULL;
4afd3348 550 _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
9a2a5625
LP		 551 char **i;
552 int r;
553
554 if (strv_isempty(ifaces))
555 return 0;
556
557 r = sd_netlink_open(&rtnl);
558 if (r < 0)
559 return log_error_errno(r, "Failed to connect to netlink: %m");
560
561 udev = udev_new();
562 if (!udev) {
563 log_error("Failed to connect to udev.");
564 return -ENOMEM;
565 }
566
567 STRV_FOREACH(i, ifaces) {
4afd3348 568 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
9a2a5625
LP		 569 _cleanup_free_ char *n = NULL;
570 int ifi;
571
572 ifi = parse_interface(udev, *i);
573 if (ifi < 0)
574 return ifi;
575
576 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
577 if (r < 0)
578 return log_error_errno(r, "Failed to allocate netlink message: %m");
579
580 r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
581 if (r < 0)
582 return log_error_errno(r, "Failed to add netlink interface index: %m");
583
584 n = strappend("iv-", *i);
585 if (!n)
586 return log_oom();
587
588 strshorten(n, IFNAMSIZ-1);
589
590 r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
591 if (r < 0)
592 return log_error_errno(r, "Failed to add netlink interface name: %m");
593
594 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
595 if (r < 0)
596 return log_error_errno(r, "Failed to add netlink namespace field: %m");
597
598 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
599 if (r < 0)
600 return log_error_errno(r, "Failed to open netlink container: %m");
601
602 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "ipvlan");
603 if (r < 0)
604 return log_error_errno(r, "Failed to open netlink container: %m");
605
606 r = sd_netlink_message_append_u16(m, IFLA_IPVLAN_MODE, IPVLAN_MODE_L2);
607 if (r < 0)
608 return log_error_errno(r, "Failed to add ipvlan mode: %m");
609
610 r = sd_netlink_message_close_container(m);
611 if (r < 0)
612 return log_error_errno(r, "Failed to close netlink container: %m");
613
614 r = sd_netlink_message_close_container(m);
615 if (r < 0)
616 return log_error_errno(r, "Failed to close netlink container: %m");
617
618 r = sd_netlink_call(rtnl, m, 0, NULL);
619 if (r < 0)
620 return log_error_errno(r, "Failed to add new ipvlan interfaces: %m");
621 }
622
623 return 0;
624}
f6d6bad1
LP		 625
626int veth_extra_parse(char ***l, const char *p) {
627 _cleanup_free_ char *a = NULL, *b = NULL;
628 int r;
629
630 r = extract_first_word(&p, &a, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
631 if (r < 0)
632 return r;
ef76dff2 633 if (r == 0 || !ifname_valid(a))
f6d6bad1
LP		 634 return -EINVAL;
635
636 r = extract_first_word(&p, &b, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
637 if (r < 0)
638 return r;
ef76dff2 639 if (r == 0 || !ifname_valid(b)) {
f6d6bad1
LP		 640 free(b);
641 b = strdup(a);
642 if (!b)
643 return -ENOMEM;
644 }
645
646 if (p)
647 return -EINVAL;
648
649 r = strv_push_pair(l, a, b);
650 if (r < 0)
651 return -ENOMEM;
652
653 a = b = NULL;
654 return 0;
655}
ef3b2aa7 656
ef3b2aa7
LP		 657int remove_veth_links(const char *primary, char **pairs) {
658 _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
659 char **a, **b;
660 int r;
661
662 /* In some cases the kernel might pin the veth links between host and container even after the namespace
663 * died. Hence, let's better remove them explicitly too. */
664
665 if (isempty(primary) && strv_isempty(pairs))
666 return 0;
667
668 r = sd_netlink_open(&rtnl);
669 if (r < 0)
670 return log_error_errno(r, "Failed to connect to netlink: %m");
671
22b28dfd 672 remove_one_link(rtnl, primary);
ef3b2aa7
LP		 673
674 STRV_FOREACH_PAIR(a, b, pairs)
22b28dfd 675 remove_one_link(rtnl, *a);
ef3b2aa7
LP		 676
677 return 0;
678}
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