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