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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
9a2a5625 LP |
2 | |
3 | #include <linux/veth.h> | |
fe993888 | 4 | #include <sys/file.h> |
9a2a5625 | 5 | |
f55b0d3f | 6 | #include "sd-device.h" |
9a2a5625 LP |
7 | #include "sd-id128.h" |
8 | #include "sd-netlink.h" | |
9a2a5625 | 9 | |
b5efdb8a | 10 | #include "alloc-util.h" |
9a2a5625 | 11 | #include "ether-addr-util.h" |
22b28dfd | 12 | #include "lockfile-util.h" |
204f52e3 | 13 | #include "missing_network.h" |
9a2a5625 | 14 | #include "netlink-util.h" |
cf0fbc49 | 15 | #include "nspawn-network.h" |
a0267b30 | 16 | #include "parse-util.h" |
07630cea | 17 | #include "siphash24.h" |
ef76dff2 LP |
18 | #include "socket-util.h" |
19 | #include "stat-util.h" | |
07630cea | 20 | #include "string-util.h" |
f55b0d3f | 21 | #include "strv.h" |
26208d5b | 22 | #include "udev-util.h" |
07630cea | 23 | #include "util.h" |
9a2a5625 LP |
24 | |
25 | #define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1) | |
26 | #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 |
27 | #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) |
28 | #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 |
29 | #define MACVLAN_HASH_KEY SD_ID128_MAKE(00,13,6d,bc,66,83,44,81,bb,0c,f9,51,1f,24,a6,6f) |
30 | ||
22b28dfd LP |
31 | static int remove_one_link(sd_netlink *rtnl, const char *name) { |
32 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; | |
33 | int r; | |
34 | ||
35 | if (isempty(name)) | |
36 | return 0; | |
37 | ||
38 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_DELLINK, 0); | |
39 | if (r < 0) | |
40 | return log_error_errno(r, "Failed to allocate netlink message: %m"); | |
41 | ||
42 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, name); | |
43 | if (r < 0) | |
44 | return log_error_errno(r, "Failed to add netlink interface name: %m"); | |
45 | ||
46 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
47 | if (r == -ENODEV) /* Already gone */ | |
48 | return 0; | |
49 | if (r < 0) | |
50 | return log_error_errno(r, "Failed to remove interface %s: %m", name); | |
51 | ||
52 | return 1; | |
53 | } | |
54 | ||
9a2a5625 LP |
55 | static int generate_mac( |
56 | const char *machine_name, | |
57 | struct ether_addr *mac, | |
58 | sd_id128_t hash_key, | |
59 | uint64_t idx) { | |
60 | ||
dbe81cbd | 61 | uint64_t result; |
9a2a5625 LP |
62 | size_t l, sz; |
63 | uint8_t *v, *i; | |
64 | int r; | |
65 | ||
66 | l = strlen(machine_name); | |
67 | sz = sizeof(sd_id128_t) + l; | |
68 | if (idx > 0) | |
69 | sz += sizeof(idx); | |
70 | ||
6e9417f5 | 71 | v = newa(uint8_t, sz); |
9a2a5625 LP |
72 | |
73 | /* fetch some persistent data unique to the host */ | |
74 | r = sd_id128_get_machine((sd_id128_t*) v); | |
75 | if (r < 0) | |
76 | return r; | |
77 | ||
78 | /* combine with some data unique (on this host) to this | |
79 | * container instance */ | |
80 | i = mempcpy(v + sizeof(sd_id128_t), machine_name, l); | |
81 | if (idx > 0) { | |
82 | idx = htole64(idx); | |
83 | memcpy(i, &idx, sizeof(idx)); | |
84 | } | |
85 | ||
86 | /* Let's hash the host machine ID plus the container name. We | |
87 | * use a fixed, but originally randomly created hash key here. */ | |
933f9cae | 88 | result = htole64(siphash24(v, sz, hash_key.bytes)); |
9a2a5625 LP |
89 | |
90 | assert_cc(ETH_ALEN <= sizeof(result)); | |
dbe81cbd | 91 | memcpy(mac->ether_addr_octet, &result, ETH_ALEN); |
9a2a5625 LP |
92 | |
93 | /* see eth_random_addr in the kernel */ | |
94 | mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */ | |
95 | mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
f6d6bad1 LP |
100 | static int add_veth( |
101 | sd_netlink *rtnl, | |
102 | pid_t pid, | |
103 | const char *ifname_host, | |
104 | const struct ether_addr *mac_host, | |
105 | const char *ifname_container, | |
106 | const struct ether_addr *mac_container) { | |
9a2a5625 | 107 | |
4afd3348 | 108 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
f6d6bad1 | 109 | int r; |
9a2a5625 | 110 | |
f6d6bad1 LP |
111 | assert(rtnl); |
112 | assert(ifname_host); | |
113 | assert(mac_host); | |
114 | assert(ifname_container); | |
115 | assert(mac_container); | |
9a2a5625 LP |
116 | |
117 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); | |
118 | if (r < 0) | |
119 | return log_error_errno(r, "Failed to allocate netlink message: %m"); | |
120 | ||
f6d6bad1 | 121 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, ifname_host); |
9a2a5625 LP |
122 | if (r < 0) |
123 | return log_error_errno(r, "Failed to add netlink interface name: %m"); | |
124 | ||
f6d6bad1 | 125 | r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, mac_host); |
9a2a5625 LP |
126 | if (r < 0) |
127 | return log_error_errno(r, "Failed to add netlink MAC address: %m"); | |
128 | ||
129 | r = sd_netlink_message_open_container(m, IFLA_LINKINFO); | |
130 | if (r < 0) | |
131 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
132 | ||
133 | r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "veth"); | |
134 | if (r < 0) | |
135 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
136 | ||
137 | r = sd_netlink_message_open_container(m, VETH_INFO_PEER); | |
138 | if (r < 0) | |
139 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
140 | ||
f6d6bad1 | 141 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, ifname_container); |
9a2a5625 LP |
142 | if (r < 0) |
143 | return log_error_errno(r, "Failed to add netlink interface name: %m"); | |
144 | ||
f6d6bad1 | 145 | r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, mac_container); |
9a2a5625 LP |
146 | if (r < 0) |
147 | return log_error_errno(r, "Failed to add netlink MAC address: %m"); | |
148 | ||
149 | r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); | |
150 | if (r < 0) | |
151 | return log_error_errno(r, "Failed to add netlink namespace field: %m"); | |
152 | ||
153 | r = sd_netlink_message_close_container(m); | |
154 | if (r < 0) | |
155 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
156 | ||
157 | r = sd_netlink_message_close_container(m); | |
158 | if (r < 0) | |
159 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
160 | ||
161 | r = sd_netlink_message_close_container(m); | |
162 | if (r < 0) | |
163 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
164 | ||
165 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
166 | if (r < 0) | |
f6d6bad1 LP |
167 | return log_error_errno(r, "Failed to add new veth interfaces (%s:%s): %m", ifname_host, ifname_container); |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | int setup_veth(const char *machine_name, | |
173 | pid_t pid, | |
174 | char iface_name[IFNAMSIZ], | |
175 | bool bridge) { | |
176 | ||
4afd3348 | 177 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
f6d6bad1 LP |
178 | struct ether_addr mac_host, mac_container; |
179 | int r, i; | |
180 | ||
181 | assert(machine_name); | |
182 | assert(pid > 0); | |
183 | assert(iface_name); | |
184 | ||
185 | /* Use two different interface name prefixes depending whether | |
186 | * we are in bridge mode or not. */ | |
187 | snprintf(iface_name, IFNAMSIZ - 1, "%s-%s", | |
188 | bridge ? "vb" : "ve", machine_name); | |
189 | ||
190 | r = generate_mac(machine_name, &mac_container, CONTAINER_HASH_KEY, 0); | |
191 | if (r < 0) | |
192 | return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m"); | |
193 | ||
194 | r = generate_mac(machine_name, &mac_host, HOST_HASH_KEY, 0); | |
195 | if (r < 0) | |
196 | return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m"); | |
197 | ||
198 | r = sd_netlink_open(&rtnl); | |
199 | if (r < 0) | |
200 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
201 | ||
202 | r = add_veth(rtnl, pid, iface_name, &mac_host, "host0", &mac_container); | |
203 | if (r < 0) | |
204 | return r; | |
9a2a5625 | 205 | |
a0267b30 YW |
206 | r = parse_ifindex_or_ifname(iface_name, &i); |
207 | if (r < 0) | |
208 | return log_error_errno(r, "Failed to resolve interface %s: %m", iface_name); | |
9a2a5625 LP |
209 | |
210 | return i; | |
211 | } | |
212 | ||
f6d6bad1 LP |
213 | int setup_veth_extra( |
214 | const char *machine_name, | |
215 | pid_t pid, | |
216 | char **pairs) { | |
217 | ||
4afd3348 | 218 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
f6d6bad1 LP |
219 | uint64_t idx = 0; |
220 | char **a, **b; | |
221 | int r; | |
222 | ||
223 | assert(machine_name); | |
224 | assert(pid > 0); | |
225 | ||
226 | if (strv_isempty(pairs)) | |
227 | return 0; | |
228 | ||
229 | r = sd_netlink_open(&rtnl); | |
230 | if (r < 0) | |
231 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
232 | ||
233 | STRV_FOREACH_PAIR(a, b, pairs) { | |
234 | struct ether_addr mac_host, mac_container; | |
235 | ||
236 | r = generate_mac(machine_name, &mac_container, VETH_EXTRA_CONTAINER_HASH_KEY, idx); | |
237 | if (r < 0) | |
238 | return log_error_errno(r, "Failed to generate predictable MAC address for container side of extra veth link: %m"); | |
239 | ||
240 | r = generate_mac(machine_name, &mac_host, VETH_EXTRA_HOST_HASH_KEY, idx); | |
241 | if (r < 0) | |
242 | return log_error_errno(r, "Failed to generate predictable MAC address for container side of extra veth link: %m"); | |
243 | ||
244 | r = add_veth(rtnl, pid, *a, &mac_host, *b, &mac_container); | |
245 | if (r < 0) | |
246 | return r; | |
247 | ||
313cefa1 | 248 | idx++; |
f6d6bad1 LP |
249 | } |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
22b28dfd | 254 | static int join_bridge(sd_netlink *rtnl, const char *veth_name, const char *bridge_name) { |
4afd3348 | 255 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
9a2a5625 LP |
256 | int r, bridge_ifi; |
257 | ||
22b28dfd | 258 | assert(rtnl); |
9a2a5625 LP |
259 | assert(veth_name); |
260 | assert(bridge_name); | |
261 | ||
a0267b30 YW |
262 | r = parse_ifindex_or_ifname(bridge_name, &bridge_ifi); |
263 | if (r < 0) | |
264 | return r; | |
9a2a5625 LP |
265 | |
266 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0); | |
267 | if (r < 0) | |
22b28dfd | 268 | return r; |
9a2a5625 LP |
269 | |
270 | r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP); | |
271 | if (r < 0) | |
22b28dfd | 272 | return r; |
9a2a5625 LP |
273 | |
274 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, veth_name); | |
275 | if (r < 0) | |
22b28dfd | 276 | return r; |
9a2a5625 LP |
277 | |
278 | r = sd_netlink_message_append_u32(m, IFLA_MASTER, bridge_ifi); | |
279 | if (r < 0) | |
22b28dfd | 280 | return r; |
9a2a5625 LP |
281 | |
282 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
283 | if (r < 0) | |
22b28dfd | 284 | return r; |
9a2a5625 LP |
285 | |
286 | return bridge_ifi; | |
287 | } | |
288 | ||
22b28dfd LP |
289 | static int create_bridge(sd_netlink *rtnl, const char *bridge_name) { |
290 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; | |
291 | int r; | |
292 | ||
293 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); | |
294 | if (r < 0) | |
295 | return r; | |
296 | ||
297 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, bridge_name); | |
298 | if (r < 0) | |
299 | return r; | |
300 | ||
301 | r = sd_netlink_message_open_container(m, IFLA_LINKINFO); | |
302 | if (r < 0) | |
303 | return r; | |
304 | ||
305 | r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "bridge"); | |
306 | if (r < 0) | |
307 | return r; | |
308 | ||
309 | r = sd_netlink_message_close_container(m); | |
310 | if (r < 0) | |
311 | return r; | |
312 | ||
313 | r = sd_netlink_message_close_container(m); | |
314 | if (r < 0) | |
315 | return r; | |
316 | ||
317 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
318 | if (r < 0) | |
319 | return r; | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | int setup_bridge(const char *veth_name, const char *bridge_name, bool create) { | |
8e766630 | 325 | _cleanup_(release_lock_file) LockFile bridge_lock = LOCK_FILE_INIT; |
22b28dfd LP |
326 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
327 | int r, bridge_ifi; | |
328 | unsigned n = 0; | |
329 | ||
330 | assert(veth_name); | |
331 | assert(bridge_name); | |
332 | ||
333 | r = sd_netlink_open(&rtnl); | |
334 | if (r < 0) | |
335 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
336 | ||
337 | if (create) { | |
338 | /* We take a system-wide lock here, so that we can safely check whether there's still a member in the | |
6dd6a9c4 | 339 | * bridge before removing it, without risking interference from other nspawn instances. */ |
22b28dfd LP |
340 | |
341 | r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock); | |
342 | if (r < 0) | |
343 | return log_error_errno(r, "Failed to take network zone lock: %m"); | |
344 | } | |
345 | ||
346 | for (;;) { | |
347 | bridge_ifi = join_bridge(rtnl, veth_name, bridge_name); | |
348 | if (bridge_ifi >= 0) | |
349 | return bridge_ifi; | |
350 | if (bridge_ifi != -ENODEV || !create || n > 10) | |
351 | return log_error_errno(bridge_ifi, "Failed to add interface %s to bridge %s: %m", veth_name, bridge_name); | |
352 | ||
353 | /* Count attempts, so that we don't enter an endless loop here. */ | |
354 | n++; | |
355 | ||
356 | /* The bridge doesn't exist yet. Let's create it */ | |
357 | r = create_bridge(rtnl, bridge_name); | |
358 | if (r < 0) | |
359 | return log_error_errno(r, "Failed to create bridge interface %s: %m", bridge_name); | |
360 | ||
361 | /* Try again, now that the bridge exists */ | |
362 | } | |
363 | } | |
364 | ||
365 | int remove_bridge(const char *bridge_name) { | |
8e766630 | 366 | _cleanup_(release_lock_file) LockFile bridge_lock = LOCK_FILE_INIT; |
22b28dfd LP |
367 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
368 | const char *path; | |
369 | int r; | |
370 | ||
371 | /* Removes the specified bridge, but only if it is currently empty */ | |
372 | ||
373 | if (isempty(bridge_name)) | |
374 | return 0; | |
375 | ||
376 | r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock); | |
377 | if (r < 0) | |
378 | return log_error_errno(r, "Failed to take network zone lock: %m"); | |
379 | ||
380 | path = strjoina("/sys/class/net/", bridge_name, "/brif"); | |
381 | ||
382 | r = dir_is_empty(path); | |
383 | if (r == -ENOENT) /* Already gone? */ | |
384 | return 0; | |
385 | if (r < 0) | |
386 | return log_error_errno(r, "Can't detect if bridge %s is empty: %m", bridge_name); | |
387 | if (r == 0) /* Still populated, leave it around */ | |
388 | return 0; | |
389 | ||
390 | r = sd_netlink_open(&rtnl); | |
391 | if (r < 0) | |
392 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
393 | ||
394 | return remove_one_link(rtnl, bridge_name); | |
395 | } | |
396 | ||
f55b0d3f YW |
397 | static int parse_interface(const char *name) { |
398 | _cleanup_(sd_device_unrefp) sd_device *d = NULL; | |
5a937ea2 | 399 | int ifi, r; |
9a2a5625 | 400 | |
a0267b30 YW |
401 | r = parse_ifindex_or_ifname(name, &ifi); |
402 | if (r < 0) | |
403 | return log_error_errno(r, "Failed to resolve interface %s: %m", name); | |
9a2a5625 | 404 | |
26208d5b YW |
405 | if (path_is_read_only_fs("/sys") <= 0) { |
406 | char ifi_str[2 + DECIMAL_STR_MAX(int)]; | |
f55b0d3f | 407 | |
26208d5b YW |
408 | /* udev should be around. */ |
409 | ||
410 | sprintf(ifi_str, "n%i", ifi); | |
411 | r = sd_device_new_from_device_id(&d, ifi_str); | |
412 | if (r < 0) | |
413 | return log_error_errno(r, "Failed to get device %s: %m", name); | |
414 | ||
415 | r = sd_device_get_is_initialized(d); | |
416 | if (r < 0) | |
417 | return log_error_errno(r, "Failed to determine whether interface %s is initialized: %m", name); | |
418 | if (r == 0) | |
419 | return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Network interface %s is not initialized yet.", name); | |
420 | ||
421 | r = device_is_renaming(d); | |
422 | if (r < 0) | |
423 | return log_error_errno(r, "Failed to determine the interface %s is being renamed: %m", name); | |
424 | if (r > 0) | |
425 | return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Interface %s is being renamed.", name); | |
9a2a5625 LP |
426 | } |
427 | ||
428 | return ifi; | |
429 | } | |
430 | ||
431 | int move_network_interfaces(pid_t pid, char **ifaces) { | |
4afd3348 | 432 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
9a2a5625 LP |
433 | char **i; |
434 | int r; | |
435 | ||
436 | if (strv_isempty(ifaces)) | |
437 | return 0; | |
438 | ||
439 | r = sd_netlink_open(&rtnl); | |
440 | if (r < 0) | |
441 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
442 | ||
9a2a5625 | 443 | STRV_FOREACH(i, ifaces) { |
4afd3348 | 444 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
9a2a5625 LP |
445 | int ifi; |
446 | ||
f55b0d3f | 447 | ifi = parse_interface(*i); |
9a2a5625 LP |
448 | if (ifi < 0) |
449 | return ifi; | |
450 | ||
451 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi); | |
452 | if (r < 0) | |
453 | return log_error_errno(r, "Failed to allocate netlink message: %m"); | |
454 | ||
455 | r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); | |
456 | if (r < 0) | |
457 | return log_error_errno(r, "Failed to append namespace PID to netlink message: %m"); | |
458 | ||
459 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
460 | if (r < 0) | |
461 | return log_error_errno(r, "Failed to move interface %s to namespace: %m", *i); | |
462 | } | |
463 | ||
464 | return 0; | |
465 | } | |
466 | ||
467 | int setup_macvlan(const char *machine_name, pid_t pid, char **ifaces) { | |
4afd3348 | 468 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
9a2a5625 LP |
469 | unsigned idx = 0; |
470 | char **i; | |
471 | int r; | |
472 | ||
473 | if (strv_isempty(ifaces)) | |
474 | return 0; | |
475 | ||
476 | r = sd_netlink_open(&rtnl); | |
477 | if (r < 0) | |
478 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
479 | ||
9a2a5625 | 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 | ||
f55b0d3f | 486 | ifi = parse_interface(*i); |
9a2a5625 LP |
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 | ||
b910cc72 | 502 | n = strjoin("mv-", *i); |
9a2a5625 LP |
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 | ||
548 | int setup_ipvlan(const char *machine_name, pid_t pid, char **ifaces) { | |
4afd3348 | 549 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
9a2a5625 LP |
550 | char **i; |
551 | int r; | |
552 | ||
553 | if (strv_isempty(ifaces)) | |
554 | return 0; | |
555 | ||
556 | r = sd_netlink_open(&rtnl); | |
557 | if (r < 0) | |
558 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
559 | ||
9a2a5625 | 560 | STRV_FOREACH(i, ifaces) { |
4afd3348 | 561 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
9a2a5625 LP |
562 | _cleanup_free_ char *n = NULL; |
563 | int ifi; | |
564 | ||
f55b0d3f | 565 | ifi = parse_interface(*i); |
9a2a5625 LP |
566 | if (ifi < 0) |
567 | return ifi; | |
568 | ||
569 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); | |
570 | if (r < 0) | |
571 | return log_error_errno(r, "Failed to allocate netlink message: %m"); | |
572 | ||
573 | r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi); | |
574 | if (r < 0) | |
575 | return log_error_errno(r, "Failed to add netlink interface index: %m"); | |
576 | ||
b910cc72 | 577 | n = strjoin("iv-", *i); |
9a2a5625 LP |
578 | if (!n) |
579 | return log_oom(); | |
580 | ||
581 | strshorten(n, IFNAMSIZ-1); | |
582 | ||
583 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, n); | |
584 | if (r < 0) | |
585 | return log_error_errno(r, "Failed to add netlink interface name: %m"); | |
586 | ||
587 | r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); | |
588 | if (r < 0) | |
589 | return log_error_errno(r, "Failed to add netlink namespace field: %m"); | |
590 | ||
591 | r = sd_netlink_message_open_container(m, IFLA_LINKINFO); | |
592 | if (r < 0) | |
593 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
594 | ||
595 | r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "ipvlan"); | |
596 | if (r < 0) | |
597 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
598 | ||
599 | r = sd_netlink_message_append_u16(m, IFLA_IPVLAN_MODE, IPVLAN_MODE_L2); | |
600 | if (r < 0) | |
601 | return log_error_errno(r, "Failed to add ipvlan mode: %m"); | |
602 | ||
603 | r = sd_netlink_message_close_container(m); | |
604 | if (r < 0) | |
605 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
606 | ||
607 | r = sd_netlink_message_close_container(m); | |
608 | if (r < 0) | |
609 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
610 | ||
611 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
612 | if (r < 0) | |
613 | return log_error_errno(r, "Failed to add new ipvlan interfaces: %m"); | |
614 | } | |
615 | ||
616 | return 0; | |
617 | } | |
f6d6bad1 LP |
618 | |
619 | int veth_extra_parse(char ***l, const char *p) { | |
620 | _cleanup_free_ char *a = NULL, *b = NULL; | |
621 | int r; | |
622 | ||
623 | r = extract_first_word(&p, &a, ":", EXTRACT_DONT_COALESCE_SEPARATORS); | |
624 | if (r < 0) | |
625 | return r; | |
ef76dff2 | 626 | if (r == 0 || !ifname_valid(a)) |
f6d6bad1 LP |
627 | return -EINVAL; |
628 | ||
629 | r = extract_first_word(&p, &b, ":", EXTRACT_DONT_COALESCE_SEPARATORS); | |
630 | if (r < 0) | |
631 | return r; | |
ef76dff2 | 632 | if (r == 0 || !ifname_valid(b)) { |
f6d6bad1 LP |
633 | free(b); |
634 | b = strdup(a); | |
635 | if (!b) | |
636 | return -ENOMEM; | |
637 | } | |
638 | ||
639 | if (p) | |
640 | return -EINVAL; | |
641 | ||
642 | r = strv_push_pair(l, a, b); | |
643 | if (r < 0) | |
644 | return -ENOMEM; | |
645 | ||
646 | a = b = NULL; | |
647 | return 0; | |
648 | } | |
ef3b2aa7 | 649 | |
ef3b2aa7 LP |
650 | int remove_veth_links(const char *primary, char **pairs) { |
651 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; | |
652 | char **a, **b; | |
653 | int r; | |
654 | ||
655 | /* In some cases the kernel might pin the veth links between host and container even after the namespace | |
656 | * died. Hence, let's better remove them explicitly too. */ | |
657 | ||
658 | if (isempty(primary) && strv_isempty(pairs)) | |
659 | return 0; | |
660 | ||
661 | r = sd_netlink_open(&rtnl); | |
662 | if (r < 0) | |
663 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
664 | ||
22b28dfd | 665 | remove_one_link(rtnl, primary); |
ef3b2aa7 LP |
666 | |
667 | STRV_FOREACH_PAIR(a, b, pairs) | |
22b28dfd | 668 | remove_one_link(rtnl, *a); |
ef3b2aa7 LP |
669 | |
670 | return 0; | |
671 | } |