1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
|
/***
This file is part of systemd.
Copyright 2015 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <net/if.h>
#include <linux/veth.h>
#include <libudev.h>
#include <systemd/sd-id128.h>
#include "sd-netlink/netlink-util.h"
#include "sd-netlink/sd-netlink.h"
#include "systemd-basic/alloc-util.h"
#include "systemd-basic/ether-addr-util.h"
#include "systemd-basic/lockfile-util.h"
#include "systemd-basic/siphash24.h"
#include "systemd-basic/socket-util.h"
#include "systemd-basic/stat-util.h"
#include "systemd-basic/string-util.h"
#include "systemd-basic/util.h"
#include "systemd-shared/udev-util.h"
#include "nspawn-network.h"
#define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1)
#define CONTAINER_HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2)
#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)
#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)
#define MACVLAN_HASH_KEY SD_ID128_MAKE(00,13,6d,bc,66,83,44,81,bb,0c,f9,51,1f,24,a6,6f)
static int remove_one_link(sd_netlink *rtnl, const char *name) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
int r;
if (isempty(name))
return 0;
r = sd_rtnl_message_new_link(rtnl, &m, RTM_DELLINK, 0);
if (r < 0)
return log_error_errno(r, "Failed to allocate netlink message: %m");
r = sd_netlink_message_append_string(m, IFLA_IFNAME, name);
if (r < 0)
return log_error_errno(r, "Failed to add netlink interface name: %m");
r = sd_netlink_call(rtnl, m, 0, NULL);
if (r == -ENODEV) /* Already gone */
return 0;
if (r < 0)
return log_error_errno(r, "Failed to remove interface %s: %m", name);
return 1;
}
static int generate_mac(
const char *machine_name,
struct ether_addr *mac,
sd_id128_t hash_key,
uint64_t idx) {
uint64_t result;
size_t l, sz;
uint8_t *v, *i;
int r;
l = strlen(machine_name);
sz = sizeof(sd_id128_t) + l;
if (idx > 0)
sz += sizeof(idx);
v = alloca(sz);
/* fetch some persistent data unique to the host */
r = sd_id128_get_machine((sd_id128_t*) v);
if (r < 0)
return r;
/* combine with some data unique (on this host) to this
* container instance */
i = mempcpy(v + sizeof(sd_id128_t), machine_name, l);
if (idx > 0) {
idx = htole64(idx);
memcpy(i, &idx, sizeof(idx));
}
/* Let's hash the host machine ID plus the container name. We
* use a fixed, but originally randomly created hash key here. */
result = htole64(siphash24(v, sz, hash_key.bytes));
assert_cc(ETH_ALEN <= sizeof(result));
memcpy(mac->ether_addr_octet, &result, ETH_ALEN);
/* see eth_random_addr in the kernel */
mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
return 0;
}
static int add_veth(
sd_netlink *rtnl,
pid_t pid,
const char *ifname_host,
const struct ether_addr *mac_host,
const char *ifname_container,
const struct ether_addr *mac_container) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
int r;
assert(rtnl);
assert(ifname_host);
assert(mac_host);
assert(ifname_container);
assert(mac_container);
r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
if (r < 0)
return log_error_errno(r, "Failed to allocate netlink message: %m");
r = sd_netlink_message_append_string(m, IFLA_IFNAME, ifname_host);
if (r < 0)
return log_error_errno(r, "Failed to add netlink interface name: %m");
r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, mac_host);
if (r < 0)
return log_error_errno(r, "Failed to add netlink MAC address: %m");
r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
if (r < 0)
return log_error_errno(r, "Failed to open netlink container: %m");
r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "veth");
if (r < 0)
return log_error_errno(r, "Failed to open netlink container: %m");
r = sd_netlink_message_open_container(m, VETH_INFO_PEER);
if (r < 0)
return log_error_errno(r, "Failed to open netlink container: %m");
r = sd_netlink_message_append_string(m, IFLA_IFNAME, ifname_container);
if (r < 0)
return log_error_errno(r, "Failed to add netlink interface name: %m");
r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, mac_container);
if (r < 0)
return log_error_errno(r, "Failed to add netlink MAC address: %m");
r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
if (r < 0)
return log_error_errno(r, "Failed to add netlink namespace field: %m");
r = sd_netlink_message_close_container(m);
if (r < 0)
return log_error_errno(r, "Failed to close netlink container: %m");
r = sd_netlink_message_close_container(m);
if (r < 0)
return log_error_errno(r, "Failed to close netlink container: %m");
r = sd_netlink_message_close_container(m);
if (r < 0)
return log_error_errno(r, "Failed to close netlink container: %m");
r = sd_netlink_call(rtnl, m, 0, NULL);
if (r < 0)
return log_error_errno(r, "Failed to add new veth interfaces (%s:%s): %m", ifname_host, ifname_container);
return 0;
}
int setup_veth(const char *machine_name,
pid_t pid,
char iface_name[IFNAMSIZ],
bool bridge) {
_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
struct ether_addr mac_host, mac_container;
int r, i;
assert(machine_name);
assert(pid > 0);
assert(iface_name);
/* Use two different interface name prefixes depending whether
* we are in bridge mode or not. */
snprintf(iface_name, IFNAMSIZ - 1, "%s-%s",
bridge ? "vb" : "ve", machine_name);
r = generate_mac(machine_name, &mac_container, CONTAINER_HASH_KEY, 0);
if (r < 0)
return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m");
r = generate_mac(machine_name, &mac_host, HOST_HASH_KEY, 0);
if (r < 0)
return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m");
r = sd_netlink_open(&rtnl);
if (r < 0)
return log_error_errno(r, "Failed to connect to netlink: %m");
r = add_veth(rtnl, pid, iface_name, &mac_host, "host0", &mac_container);
if (r < 0)
return r;
i = (int) if_nametoindex(iface_name);
if (i <= 0)
return log_error_errno(errno, "Failed to resolve interface %s: %m", iface_name);
return i;
}
int setup_veth_extra(
const char *machine_name,
pid_t pid,
char **pairs) {
_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
uint64_t idx = 0;
char **a, **b;
int r;
assert(machine_name);
assert(pid > 0);
if (strv_isempty(pairs))
return 0;
r = sd_netlink_open(&rtnl);
if (r < 0)
return log_error_errno(r, "Failed to connect to netlink: %m");
STRV_FOREACH_PAIR(a, b, pairs) {
struct ether_addr mac_host, mac_container;
r = generate_mac(machine_name, &mac_container, VETH_EXTRA_CONTAINER_HASH_KEY, idx);
if (r < 0)
return log_error_errno(r, "Failed to generate predictable MAC address for container side of extra veth link: %m");
r = generate_mac(machine_name, &mac_host, VETH_EXTRA_HOST_HASH_KEY, idx);
if (r < 0)
return log_error_errno(r, "Failed to generate predictable MAC address for container side of extra veth link: %m");
r = add_veth(rtnl, pid, *a, &mac_host, *b, &mac_container);
if (r < 0)
return r;
idx++;
}
return 0;
}
static int join_bridge(sd_netlink *rtnl, const char *veth_name, const char *bridge_name) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
int r, bridge_ifi;
assert(rtnl);
assert(veth_name);
assert(bridge_name);
bridge_ifi = (int) if_nametoindex(bridge_name);
if (bridge_ifi <= 0)
return -errno;
r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0);
if (r < 0)
return r;
r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP);
if (r < 0)
return r;
r = sd_netlink_message_append_string(m, IFLA_IFNAME, veth_name);
if (r < 0)
return r;
r = sd_netlink_message_append_u32(m, IFLA_MASTER, bridge_ifi);
if (r < 0)
return r;
r = sd_netlink_call(rtnl, m, 0, NULL);
if (r < 0)
return r;
return bridge_ifi;
}
static int create_bridge(sd_netlink *rtnl, const char *bridge_name) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
int r;
r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
if (r < 0)
return r;
r = sd_netlink_message_append_string(m, IFLA_IFNAME, bridge_name);
if (r < 0)
return r;
r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
if (r < 0)
return r;
r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "bridge");
if (r < 0)
return r;
r = sd_netlink_message_close_container(m);
if (r < 0)
return r;
r = sd_netlink_message_close_container(m);
if (r < 0)
return r;
r = sd_netlink_call(rtnl, m, 0, NULL);
if (r < 0)
return r;
return 0;
}
int setup_bridge(const char *veth_name, const char *bridge_name, bool create) {
_cleanup_release_lock_file_ LockFile bridge_lock = LOCK_FILE_INIT;
_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
int r, bridge_ifi;
unsigned n = 0;
assert(veth_name);
assert(bridge_name);
r = sd_netlink_open(&rtnl);
if (r < 0)
return log_error_errno(r, "Failed to connect to netlink: %m");
if (create) {
/* We take a system-wide lock here, so that we can safely check whether there's still a member in the
* bridge before removing it, without risking interference from other nspawn instances. */
r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock);
if (r < 0)
return log_error_errno(r, "Failed to take network zone lock: %m");
}
for (;;) {
bridge_ifi = join_bridge(rtnl, veth_name, bridge_name);
if (bridge_ifi >= 0)
return bridge_ifi;
if (bridge_ifi != -ENODEV || !create || n > 10)
return log_error_errno(bridge_ifi, "Failed to add interface %s to bridge %s: %m", veth_name, bridge_name);
/* Count attempts, so that we don't enter an endless loop here. */
n++;
/* The bridge doesn't exist yet. Let's create it */
r = create_bridge(rtnl, bridge_name);
if (r < 0)
return log_error_errno(r, "Failed to create bridge interface %s: %m", bridge_name);
/* Try again, now that the bridge exists */
}
}
int remove_bridge(const char *bridge_name) {
_cleanup_release_lock_file_ LockFile bridge_lock = LOCK_FILE_INIT;
_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
const char *path;
int r;
/* Removes the specified bridge, but only if it is currently empty */
if (isempty(bridge_name))
return 0;
r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock);
if (r < 0)
return log_error_errno(r, "Failed to take network zone lock: %m");
path = strjoina("/sys/class/net/", bridge_name, "/brif");
r = dir_is_empty(path);
if (r == -ENOENT) /* Already gone? */
return 0;
if (r < 0)
return log_error_errno(r, "Can't detect if bridge %s is empty: %m", bridge_name);
if (r == 0) /* Still populated, leave it around */
return 0;
r = sd_netlink_open(&rtnl);
if (r < 0)
return log_error_errno(r, "Failed to connect to netlink: %m");
return remove_one_link(rtnl, bridge_name);
}
static int parse_interface(struct udev *udev, const char *name) {
_cleanup_udev_device_unref_ struct udev_device *d = NULL;
char ifi_str[2 + DECIMAL_STR_MAX(int)];
int ifi;
ifi = (int) if_nametoindex(name);
if (ifi <= 0)
return log_error_errno(errno, "Failed to resolve interface %s: %m", name);
sprintf(ifi_str, "n%i", ifi);
d = udev_device_new_from_device_id(udev, ifi_str);
if (!d)
return log_error_errno(errno, "Failed to get udev device for interface %s: %m", name);
if (udev_device_get_is_initialized(d) <= 0) {
log_error("Network interface %s is not initialized yet.", name);
return -EBUSY;
}
return ifi;
}
int move_network_interfaces(pid_t pid, char **ifaces) {
_cleanup_udev_unref_ struct udev *udev = NULL;
_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
char **i;
int r;
if (strv_isempty(ifaces))
return 0;
r = sd_netlink_open(&rtnl);
if (r < 0)
return log_error_errno(r, "Failed to connect to netlink: %m");
udev = udev_new();
if (!udev) {
log_error("Failed to connect to udev.");
return -ENOMEM;
}
STRV_FOREACH(i, ifaces) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
int ifi;
ifi = parse_interface(udev, *i);
if (ifi < 0)
return ifi;
r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi);
if (r < 0)
return log_error_errno(r, "Failed to allocate netlink message: %m");
r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
if (r < 0)
return log_error_errno(r, "Failed to append namespace PID to netlink message: %m");
r = sd_netlink_call(rtnl, m, 0, NULL);
if (r < 0)
return log_error_errno(r, "Failed to move interface %s to namespace: %m", *i);
}
return 0;
}
int setup_macvlan(const char *machine_name, pid_t pid, char **ifaces) {
_cleanup_udev_unref_ struct udev *udev = NULL;
_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
unsigned idx = 0;
char **i;
int r;
if (strv_isempty(ifaces))
return 0;
r = sd_netlink_open(&rtnl);
if (r < 0)
return log_error_errno(r, "Failed to connect to netlink: %m");
udev = udev_new();
if (!udev) {
log_error("Failed to connect to udev.");
return -ENOMEM;
}
STRV_FOREACH(i, ifaces) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
_cleanup_free_ char *n = NULL;
struct ether_addr mac;
int ifi;
ifi = parse_interface(udev, *i);
if (ifi < 0)
return ifi;
r = generate_mac(machine_name, &mac, MACVLAN_HASH_KEY, idx++);
if (r < 0)
return log_error_errno(r, "Failed to create MACVLAN MAC address: %m");
r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
if (r < 0)
return log_error_errno(r, "Failed to allocate netlink message: %m");
r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
if (r < 0)
return log_error_errno(r, "Failed to add netlink interface index: %m");
n = strappend("mv-", *i);
if (!n)
return log_oom();
strshorten(n, IFNAMSIZ-1);
r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
if (r < 0)
return log_error_errno(r, "Failed to add netlink interface name: %m");
r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac);
if (r < 0)
return log_error_errno(r, "Failed to add netlink MAC address: %m");
r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
if (r < 0)
return log_error_errno(r, "Failed to add netlink namespace field: %m");
r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
if (r < 0)
return log_error_errno(r, "Failed to open netlink container: %m");
r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "macvlan");
if (r < 0)
return log_error_errno(r, "Failed to open netlink container: %m");
r = sd_netlink_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE);
if (r < 0)
return log_error_errno(r, "Failed to append macvlan mode: %m");
r = sd_netlink_message_close_container(m);
if (r < 0)
return log_error_errno(r, "Failed to close netlink container: %m");
r = sd_netlink_message_close_container(m);
if (r < 0)
return log_error_errno(r, "Failed to close netlink container: %m");
r = sd_netlink_call(rtnl, m, 0, NULL);
if (r < 0)
return log_error_errno(r, "Failed to add new macvlan interfaces: %m");
}
return 0;
}
int setup_ipvlan(const char *machine_name, pid_t pid, char **ifaces) {
_cleanup_udev_unref_ struct udev *udev = NULL;
_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
char **i;
int r;
if (strv_isempty(ifaces))
return 0;
r = sd_netlink_open(&rtnl);
if (r < 0)
return log_error_errno(r, "Failed to connect to netlink: %m");
udev = udev_new();
if (!udev) {
log_error("Failed to connect to udev.");
return -ENOMEM;
}
STRV_FOREACH(i, ifaces) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
_cleanup_free_ char *n = NULL;
int ifi;
ifi = parse_interface(udev, *i);
if (ifi < 0)
return ifi;
r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
if (r < 0)
return log_error_errno(r, "Failed to allocate netlink message: %m");
r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
if (r < 0)
return log_error_errno(r, "Failed to add netlink interface index: %m");
n = strappend("iv-", *i);
if (!n)
return log_oom();
strshorten(n, IFNAMSIZ-1);
r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
if (r < 0)
return log_error_errno(r, "Failed to add netlink interface name: %m");
r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
if (r < 0)
return log_error_errno(r, "Failed to add netlink namespace field: %m");
r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
if (r < 0)
return log_error_errno(r, "Failed to open netlink container: %m");
r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "ipvlan");
if (r < 0)
return log_error_errno(r, "Failed to open netlink container: %m");
r = sd_netlink_message_append_u16(m, IFLA_IPVLAN_MODE, IPVLAN_MODE_L2);
if (r < 0)
return log_error_errno(r, "Failed to add ipvlan mode: %m");
r = sd_netlink_message_close_container(m);
if (r < 0)
return log_error_errno(r, "Failed to close netlink container: %m");
r = sd_netlink_message_close_container(m);
if (r < 0)
return log_error_errno(r, "Failed to close netlink container: %m");
r = sd_netlink_call(rtnl, m, 0, NULL);
if (r < 0)
return log_error_errno(r, "Failed to add new ipvlan interfaces: %m");
}
return 0;
}
int veth_extra_parse(char ***l, const char *p) {
_cleanup_free_ char *a = NULL, *b = NULL;
int r;
r = extract_first_word(&p, &a, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
if (r < 0)
return r;
if (r == 0 || !ifname_valid(a))
return -EINVAL;
r = extract_first_word(&p, &b, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
if (r < 0)
return r;
if (r == 0 || !ifname_valid(b)) {
free(b);
b = strdup(a);
if (!b)
return -ENOMEM;
}
if (p)
return -EINVAL;
r = strv_push_pair(l, a, b);
if (r < 0)
return -ENOMEM;
a = b = NULL;
return 0;
}
int remove_veth_links(const char *primary, char **pairs) {
_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
char **a, **b;
int r;
/* In some cases the kernel might pin the veth links between host and container even after the namespace
* died. Hence, let's better remove them explicitly too. */
if (isempty(primary) && strv_isempty(pairs))
return 0;
r = sd_netlink_open(&rtnl);
if (r < 0)
return log_error_errno(r, "Failed to connect to netlink: %m");
remove_one_link(rtnl, primary);
STRV_FOREACH_PAIR(a, b, pairs)
remove_one_link(rtnl, *a);
return 0;
}
|