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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
9a2a5625 | 2 | |
6b50cb5c YW |
3 | #include <net/if.h> |
4 | #include <linux/if.h> | |
9a2a5625 | 5 | #include <linux/veth.h> |
fe993888 | 6 | #include <sys/file.h> |
9a2a5625 | 7 | |
f55b0d3f | 8 | #include "sd-device.h" |
9a2a5625 LP |
9 | #include "sd-id128.h" |
10 | #include "sd-netlink.h" | |
9a2a5625 | 11 | |
b5efdb8a | 12 | #include "alloc-util.h" |
9a2a5625 | 13 | #include "ether-addr-util.h" |
22b28dfd | 14 | #include "lockfile-util.h" |
204f52e3 | 15 | #include "missing_network.h" |
bc5ea049 | 16 | #include "netif-naming-scheme.h" |
9a2a5625 | 17 | #include "netlink-util.h" |
cf0fbc49 | 18 | #include "nspawn-network.h" |
a0267b30 | 19 | #include "parse-util.h" |
07630cea | 20 | #include "siphash24.h" |
d308bb99 | 21 | #include "socket-netlink.h" |
ef76dff2 LP |
22 | #include "socket-util.h" |
23 | #include "stat-util.h" | |
07630cea | 24 | #include "string-util.h" |
f55b0d3f | 25 | #include "strv.h" |
26208d5b | 26 | #include "udev-util.h" |
07630cea | 27 | #include "util.h" |
9a2a5625 LP |
28 | |
29 | #define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1) | |
30 | #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 |
31 | #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) |
32 | #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 | 33 | #define MACVLAN_HASH_KEY SD_ID128_MAKE(00,13,6d,bc,66,83,44,81,bb,0c,f9,51,1f,24,a6,6f) |
bc5ea049 | 34 | #define SHORTEN_IFNAME_HASH_KEY SD_ID128_MAKE(e1,90,a4,04,a8,ef,4b,51,8c,cc,c3,3a,9f,11,fc,a2) |
9a2a5625 | 35 | |
22b28dfd LP |
36 | static int remove_one_link(sd_netlink *rtnl, const char *name) { |
37 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; | |
38 | int r; | |
39 | ||
40 | if (isempty(name)) | |
41 | return 0; | |
42 | ||
43 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_DELLINK, 0); | |
44 | if (r < 0) | |
45 | return log_error_errno(r, "Failed to allocate netlink message: %m"); | |
46 | ||
47 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, name); | |
48 | if (r < 0) | |
49 | return log_error_errno(r, "Failed to add netlink interface name: %m"); | |
50 | ||
51 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
52 | if (r == -ENODEV) /* Already gone */ | |
53 | return 0; | |
54 | if (r < 0) | |
55 | return log_error_errno(r, "Failed to remove interface %s: %m", name); | |
56 | ||
57 | return 1; | |
58 | } | |
59 | ||
9a2a5625 LP |
60 | static int generate_mac( |
61 | const char *machine_name, | |
62 | struct ether_addr *mac, | |
63 | sd_id128_t hash_key, | |
64 | uint64_t idx) { | |
65 | ||
dbe81cbd | 66 | uint64_t result; |
9a2a5625 LP |
67 | size_t l, sz; |
68 | uint8_t *v, *i; | |
69 | int r; | |
70 | ||
71 | l = strlen(machine_name); | |
72 | sz = sizeof(sd_id128_t) + l; | |
73 | if (idx > 0) | |
74 | sz += sizeof(idx); | |
75 | ||
6e9417f5 | 76 | v = newa(uint8_t, sz); |
9a2a5625 LP |
77 | |
78 | /* fetch some persistent data unique to the host */ | |
79 | r = sd_id128_get_machine((sd_id128_t*) v); | |
80 | if (r < 0) | |
81 | return r; | |
82 | ||
83 | /* combine with some data unique (on this host) to this | |
84 | * container instance */ | |
85 | i = mempcpy(v + sizeof(sd_id128_t), machine_name, l); | |
86 | if (idx > 0) { | |
87 | idx = htole64(idx); | |
88 | memcpy(i, &idx, sizeof(idx)); | |
89 | } | |
90 | ||
91 | /* Let's hash the host machine ID plus the container name. We | |
92 | * use a fixed, but originally randomly created hash key here. */ | |
933f9cae | 93 | result = htole64(siphash24(v, sz, hash_key.bytes)); |
9a2a5625 LP |
94 | |
95 | assert_cc(ETH_ALEN <= sizeof(result)); | |
dbe81cbd | 96 | memcpy(mac->ether_addr_octet, &result, ETH_ALEN); |
9a2a5625 LP |
97 | |
98 | /* see eth_random_addr in the kernel */ | |
99 | mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */ | |
100 | mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
6b50cb5c YW |
105 | static int set_alternative_ifname(sd_netlink *rtnl, const char *ifname, const char *altifname) { |
106 | int r; | |
107 | ||
108 | assert(rtnl); | |
109 | assert(ifname); | |
110 | ||
111 | if (!altifname) | |
112 | return 0; | |
113 | ||
114 | if (strlen(altifname) >= ALTIFNAMSIZ) | |
115 | return log_warning_errno(SYNTHETIC_ERRNO(ERANGE), | |
116 | "Alternative interface name '%s' for '%s' is too long, ignoring", | |
117 | altifname, ifname); | |
118 | ||
119 | r = rtnl_set_link_alternative_names_by_ifname(&rtnl, ifname, STRV_MAKE(altifname)); | |
120 | if (r < 0) | |
121 | return log_warning_errno(r, | |
122 | "Failed to set alternative interface name '%s' to '%s', ignoring: %m", | |
123 | altifname, ifname); | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
f6d6bad1 LP |
128 | static int add_veth( |
129 | sd_netlink *rtnl, | |
130 | pid_t pid, | |
131 | const char *ifname_host, | |
6b50cb5c | 132 | const char *altifname_host, |
f6d6bad1 LP |
133 | const struct ether_addr *mac_host, |
134 | const char *ifname_container, | |
135 | const struct ether_addr *mac_container) { | |
9a2a5625 | 136 | |
4afd3348 | 137 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
f6d6bad1 | 138 | int r; |
9a2a5625 | 139 | |
f6d6bad1 LP |
140 | assert(rtnl); |
141 | assert(ifname_host); | |
142 | assert(mac_host); | |
143 | assert(ifname_container); | |
144 | assert(mac_container); | |
9a2a5625 LP |
145 | |
146 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); | |
147 | if (r < 0) | |
148 | return log_error_errno(r, "Failed to allocate netlink message: %m"); | |
149 | ||
f6d6bad1 | 150 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, ifname_host); |
9a2a5625 LP |
151 | if (r < 0) |
152 | return log_error_errno(r, "Failed to add netlink interface name: %m"); | |
153 | ||
f6d6bad1 | 154 | r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, mac_host); |
9a2a5625 LP |
155 | if (r < 0) |
156 | return log_error_errno(r, "Failed to add netlink MAC address: %m"); | |
157 | ||
158 | r = sd_netlink_message_open_container(m, IFLA_LINKINFO); | |
159 | if (r < 0) | |
160 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
161 | ||
162 | r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "veth"); | |
163 | if (r < 0) | |
164 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
165 | ||
166 | r = sd_netlink_message_open_container(m, VETH_INFO_PEER); | |
167 | if (r < 0) | |
168 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
169 | ||
f6d6bad1 | 170 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, ifname_container); |
9a2a5625 LP |
171 | if (r < 0) |
172 | return log_error_errno(r, "Failed to add netlink interface name: %m"); | |
173 | ||
f6d6bad1 | 174 | r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, mac_container); |
9a2a5625 LP |
175 | if (r < 0) |
176 | return log_error_errno(r, "Failed to add netlink MAC address: %m"); | |
177 | ||
178 | r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); | |
179 | if (r < 0) | |
180 | return log_error_errno(r, "Failed to add netlink namespace field: %m"); | |
181 | ||
182 | r = sd_netlink_message_close_container(m); | |
183 | if (r < 0) | |
184 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
185 | ||
186 | r = sd_netlink_message_close_container(m); | |
187 | if (r < 0) | |
188 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
189 | ||
190 | r = sd_netlink_message_close_container(m); | |
191 | if (r < 0) | |
192 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
193 | ||
194 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
195 | if (r < 0) | |
f6d6bad1 LP |
196 | return log_error_errno(r, "Failed to add new veth interfaces (%s:%s): %m", ifname_host, ifname_container); |
197 | ||
6b50cb5c YW |
198 | (void) set_alternative_ifname(rtnl, ifname_host, altifname_host); |
199 | ||
f6d6bad1 LP |
200 | return 0; |
201 | } | |
202 | ||
bc5ea049 KK |
203 | /* This is almost base64char(), but not entirely, as it uses the "url and filename safe" alphabet, since we |
204 | * don't want "/" appear in interface names (since interfaces appear in sysfs as filenames). See section #5 | |
205 | * of RFC 4648. */ | |
206 | static char urlsafe_base64char(int x) { | |
207 | static const char table[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
208 | "abcdefghijklmnopqrstuvwxyz" | |
209 | "0123456789-_"; | |
210 | return table[x & 63]; | |
211 | } | |
212 | ||
6b50cb5c | 213 | static int shorten_ifname(char *ifname) { |
bc5ea049 KK |
214 | char new_ifname[IFNAMSIZ]; |
215 | ||
216 | assert(ifname); | |
217 | ||
218 | if (strlen(ifname) < IFNAMSIZ) /* Name is short enough */ | |
6b50cb5c | 219 | return 0; |
bc5ea049 KK |
220 | |
221 | if (naming_scheme_has(NAMING_NSPAWN_LONG_HASH)) { | |
222 | uint64_t h; | |
223 | ||
224 | /* Calculate 64bit hash value */ | |
225 | h = siphash24(ifname, strlen(ifname), SHORTEN_IFNAME_HASH_KEY.bytes); | |
226 | ||
227 | /* Set the final four bytes (i.e. 32bit) to the lower 24bit of the hash, encoded in url-safe base64 */ | |
228 | memcpy(new_ifname, ifname, IFNAMSIZ - 5); | |
229 | new_ifname[IFNAMSIZ - 5] = urlsafe_base64char(h >> 18); | |
230 | new_ifname[IFNAMSIZ - 4] = urlsafe_base64char(h >> 12); | |
231 | new_ifname[IFNAMSIZ - 3] = urlsafe_base64char(h >> 6); | |
232 | new_ifname[IFNAMSIZ - 2] = urlsafe_base64char(h); | |
233 | } else | |
234 | /* On old nspawn versions we just truncated the name, provide compatibility */ | |
235 | memcpy(new_ifname, ifname, IFNAMSIZ-1); | |
236 | ||
237 | new_ifname[IFNAMSIZ - 1] = 0; | |
238 | ||
239 | /* Log the incident to make it more discoverable */ | |
240 | log_warning("Network interface name '%s' has been changed to '%s' to fit length constraints.", ifname, new_ifname); | |
241 | ||
242 | strcpy(ifname, new_ifname); | |
6b50cb5c | 243 | return 1; |
bc5ea049 KK |
244 | } |
245 | ||
f6d6bad1 LP |
246 | int setup_veth(const char *machine_name, |
247 | pid_t pid, | |
248 | char iface_name[IFNAMSIZ], | |
249 | bool bridge) { | |
250 | ||
4afd3348 | 251 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
f6d6bad1 | 252 | struct ether_addr mac_host, mac_container; |
bc5ea049 | 253 | unsigned u; |
6b50cb5c | 254 | char *n, *a = NULL; |
bc5ea049 | 255 | int r; |
f6d6bad1 LP |
256 | |
257 | assert(machine_name); | |
258 | assert(pid > 0); | |
259 | assert(iface_name); | |
260 | ||
261 | /* Use two different interface name prefixes depending whether | |
262 | * we are in bridge mode or not. */ | |
bc5ea049 | 263 | n = strjoina(bridge ? "vb-" : "ve-", machine_name); |
6b50cb5c YW |
264 | r = shorten_ifname(n); |
265 | if (r > 0) | |
266 | a = strjoina(bridge ? "vb-" : "ve-", machine_name); | |
f6d6bad1 LP |
267 | |
268 | r = generate_mac(machine_name, &mac_container, CONTAINER_HASH_KEY, 0); | |
269 | if (r < 0) | |
270 | return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m"); | |
271 | ||
272 | r = generate_mac(machine_name, &mac_host, HOST_HASH_KEY, 0); | |
273 | if (r < 0) | |
274 | return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m"); | |
275 | ||
276 | r = sd_netlink_open(&rtnl); | |
277 | if (r < 0) | |
278 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
279 | ||
6b50cb5c | 280 | r = add_veth(rtnl, pid, n, a, &mac_host, "host0", &mac_container); |
f6d6bad1 LP |
281 | if (r < 0) |
282 | return r; | |
9a2a5625 | 283 | |
d308bb99 ZJS |
284 | u = if_nametoindex(n); /* We don't need to use resolve_ifname() here because the |
285 | * name we assigned is always the main name. */ | |
bc5ea049 KK |
286 | if (u == 0) |
287 | return log_error_errno(errno, "Failed to resolve interface %s: %m", n); | |
9a2a5625 | 288 | |
bc5ea049 KK |
289 | strcpy(iface_name, n); |
290 | return (int) u; | |
9a2a5625 LP |
291 | } |
292 | ||
f6d6bad1 LP |
293 | int setup_veth_extra( |
294 | const char *machine_name, | |
295 | pid_t pid, | |
296 | char **pairs) { | |
297 | ||
4afd3348 | 298 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
f6d6bad1 LP |
299 | uint64_t idx = 0; |
300 | char **a, **b; | |
301 | int r; | |
302 | ||
303 | assert(machine_name); | |
304 | assert(pid > 0); | |
305 | ||
306 | if (strv_isempty(pairs)) | |
307 | return 0; | |
308 | ||
309 | r = sd_netlink_open(&rtnl); | |
310 | if (r < 0) | |
311 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
312 | ||
313 | STRV_FOREACH_PAIR(a, b, pairs) { | |
314 | struct ether_addr mac_host, mac_container; | |
315 | ||
316 | r = generate_mac(machine_name, &mac_container, VETH_EXTRA_CONTAINER_HASH_KEY, idx); | |
317 | if (r < 0) | |
318 | return log_error_errno(r, "Failed to generate predictable MAC address for container side of extra veth link: %m"); | |
319 | ||
320 | r = generate_mac(machine_name, &mac_host, VETH_EXTRA_HOST_HASH_KEY, idx); | |
321 | if (r < 0) | |
bcc0fe63 | 322 | return log_error_errno(r, "Failed to generate predictable MAC address for host side of extra veth link: %m"); |
f6d6bad1 | 323 | |
6b50cb5c | 324 | r = add_veth(rtnl, pid, *a, NULL, &mac_host, *b, &mac_container); |
f6d6bad1 LP |
325 | if (r < 0) |
326 | return r; | |
327 | ||
313cefa1 | 328 | idx++; |
f6d6bad1 LP |
329 | } |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
22b28dfd | 334 | static int join_bridge(sd_netlink *rtnl, const char *veth_name, const char *bridge_name) { |
4afd3348 | 335 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
9a2a5625 LP |
336 | int r, bridge_ifi; |
337 | ||
22b28dfd | 338 | assert(rtnl); |
9a2a5625 LP |
339 | assert(veth_name); |
340 | assert(bridge_name); | |
341 | ||
d308bb99 | 342 | bridge_ifi = resolve_interface(&rtnl, bridge_name); |
597da51b ZJS |
343 | if (bridge_ifi < 0) |
344 | return bridge_ifi; | |
9a2a5625 LP |
345 | |
346 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0); | |
347 | if (r < 0) | |
22b28dfd | 348 | return r; |
9a2a5625 LP |
349 | |
350 | r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP); | |
351 | if (r < 0) | |
22b28dfd | 352 | return r; |
9a2a5625 LP |
353 | |
354 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, veth_name); | |
355 | if (r < 0) | |
22b28dfd | 356 | return r; |
9a2a5625 LP |
357 | |
358 | r = sd_netlink_message_append_u32(m, IFLA_MASTER, bridge_ifi); | |
359 | if (r < 0) | |
22b28dfd | 360 | return r; |
9a2a5625 LP |
361 | |
362 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
363 | if (r < 0) | |
22b28dfd | 364 | return r; |
9a2a5625 LP |
365 | |
366 | return bridge_ifi; | |
367 | } | |
368 | ||
22b28dfd LP |
369 | static int create_bridge(sd_netlink *rtnl, const char *bridge_name) { |
370 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; | |
371 | int r; | |
372 | ||
373 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); | |
374 | if (r < 0) | |
375 | return r; | |
376 | ||
377 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, bridge_name); | |
378 | if (r < 0) | |
379 | return r; | |
380 | ||
381 | r = sd_netlink_message_open_container(m, IFLA_LINKINFO); | |
382 | if (r < 0) | |
383 | return r; | |
384 | ||
385 | r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "bridge"); | |
386 | if (r < 0) | |
387 | return r; | |
388 | ||
389 | r = sd_netlink_message_close_container(m); | |
390 | if (r < 0) | |
391 | return r; | |
392 | ||
393 | r = sd_netlink_message_close_container(m); | |
394 | if (r < 0) | |
395 | return r; | |
396 | ||
397 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
398 | if (r < 0) | |
399 | return r; | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | int setup_bridge(const char *veth_name, const char *bridge_name, bool create) { | |
8e766630 | 405 | _cleanup_(release_lock_file) LockFile bridge_lock = LOCK_FILE_INIT; |
22b28dfd LP |
406 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
407 | int r, bridge_ifi; | |
408 | unsigned n = 0; | |
409 | ||
410 | assert(veth_name); | |
411 | assert(bridge_name); | |
412 | ||
413 | r = sd_netlink_open(&rtnl); | |
414 | if (r < 0) | |
415 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
416 | ||
417 | if (create) { | |
418 | /* We take a system-wide lock here, so that we can safely check whether there's still a member in the | |
6dd6a9c4 | 419 | * bridge before removing it, without risking interference from other nspawn instances. */ |
22b28dfd LP |
420 | |
421 | r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock); | |
422 | if (r < 0) | |
423 | return log_error_errno(r, "Failed to take network zone lock: %m"); | |
424 | } | |
425 | ||
426 | for (;;) { | |
427 | bridge_ifi = join_bridge(rtnl, veth_name, bridge_name); | |
428 | if (bridge_ifi >= 0) | |
429 | return bridge_ifi; | |
430 | if (bridge_ifi != -ENODEV || !create || n > 10) | |
431 | return log_error_errno(bridge_ifi, "Failed to add interface %s to bridge %s: %m", veth_name, bridge_name); | |
432 | ||
433 | /* Count attempts, so that we don't enter an endless loop here. */ | |
434 | n++; | |
435 | ||
436 | /* The bridge doesn't exist yet. Let's create it */ | |
437 | r = create_bridge(rtnl, bridge_name); | |
438 | if (r < 0) | |
439 | return log_error_errno(r, "Failed to create bridge interface %s: %m", bridge_name); | |
440 | ||
441 | /* Try again, now that the bridge exists */ | |
442 | } | |
443 | } | |
444 | ||
445 | int remove_bridge(const char *bridge_name) { | |
8e766630 | 446 | _cleanup_(release_lock_file) LockFile bridge_lock = LOCK_FILE_INIT; |
22b28dfd LP |
447 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
448 | const char *path; | |
449 | int r; | |
450 | ||
451 | /* Removes the specified bridge, but only if it is currently empty */ | |
452 | ||
453 | if (isempty(bridge_name)) | |
454 | return 0; | |
455 | ||
456 | r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock); | |
457 | if (r < 0) | |
458 | return log_error_errno(r, "Failed to take network zone lock: %m"); | |
459 | ||
460 | path = strjoina("/sys/class/net/", bridge_name, "/brif"); | |
461 | ||
462 | r = dir_is_empty(path); | |
463 | if (r == -ENOENT) /* Already gone? */ | |
464 | return 0; | |
465 | if (r < 0) | |
466 | return log_error_errno(r, "Can't detect if bridge %s is empty: %m", bridge_name); | |
467 | if (r == 0) /* Still populated, leave it around */ | |
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 | return remove_one_link(rtnl, bridge_name); | |
475 | } | |
476 | ||
b390f178 DDM |
477 | int test_network_interface_initialized(const char *name) { |
478 | _cleanup_(sd_device_unrefp) sd_device *d = NULL; | |
479 | int ifi, r; | |
480 | char ifi_str[2 + DECIMAL_STR_MAX(int)]; | |
26208d5b | 481 | |
b390f178 DDM |
482 | if (path_is_read_only_fs("/sys")) |
483 | return 0; | |
26208d5b | 484 | |
b390f178 | 485 | /* udev should be around. */ |
26208d5b | 486 | |
d308bb99 | 487 | ifi = resolve_interface_or_warn(NULL, name); |
b390f178 DDM |
488 | if (ifi < 0) |
489 | return ifi; | |
9a2a5625 | 490 | |
b390f178 DDM |
491 | sprintf(ifi_str, "n%i", ifi); |
492 | r = sd_device_new_from_device_id(&d, ifi_str); | |
493 | if (r < 0) | |
494 | return log_error_errno(r, "Failed to get device %s: %m", name); | |
495 | ||
496 | r = sd_device_get_is_initialized(d); | |
497 | if (r < 0) | |
498 | return log_error_errno(r, "Failed to determine whether interface %s is initialized: %m", name); | |
499 | if (r == 0) | |
500 | return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Network interface %s is not initialized yet.", name); | |
501 | ||
502 | r = device_is_renaming(d); | |
503 | if (r < 0) | |
504 | return log_error_errno(r, "Failed to determine the interface %s is being renamed: %m", name); | |
505 | if (r > 0) | |
506 | return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Interface %s is being renamed.", name); | |
507 | ||
508 | return 0; | |
9a2a5625 LP |
509 | } |
510 | ||
5b4855ab | 511 | int move_network_interfaces(int netns_fd, char **ifaces) { |
4afd3348 | 512 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
9a2a5625 LP |
513 | char **i; |
514 | int r; | |
515 | ||
516 | if (strv_isempty(ifaces)) | |
517 | return 0; | |
518 | ||
519 | r = sd_netlink_open(&rtnl); | |
520 | if (r < 0) | |
521 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
522 | ||
9a2a5625 | 523 | STRV_FOREACH(i, ifaces) { |
4afd3348 | 524 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
9a2a5625 LP |
525 | int ifi; |
526 | ||
d308bb99 | 527 | ifi = resolve_interface_or_warn(&rtnl, *i); |
9a2a5625 LP |
528 | if (ifi < 0) |
529 | return ifi; | |
530 | ||
531 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi); | |
532 | if (r < 0) | |
533 | return log_error_errno(r, "Failed to allocate netlink message: %m"); | |
534 | ||
5b4855ab | 535 | r = sd_netlink_message_append_u32(m, IFLA_NET_NS_FD, netns_fd); |
9a2a5625 | 536 | if (r < 0) |
5b4855ab | 537 | return log_error_errno(r, "Failed to append namespace fd to netlink message: %m"); |
9a2a5625 LP |
538 | |
539 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
540 | if (r < 0) | |
541 | return log_error_errno(r, "Failed to move interface %s to namespace: %m", *i); | |
542 | } | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
547 | int setup_macvlan(const char *machine_name, pid_t pid, char **ifaces) { | |
4afd3348 | 548 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
9a2a5625 LP |
549 | unsigned idx = 0; |
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; |
6b50cb5c | 562 | _cleanup_free_ char *n = NULL, *a = NULL; |
9a2a5625 LP |
563 | struct ether_addr mac; |
564 | int ifi; | |
565 | ||
d308bb99 | 566 | ifi = resolve_interface_or_warn(&rtnl, *i); |
9a2a5625 LP |
567 | if (ifi < 0) |
568 | return ifi; | |
569 | ||
570 | r = generate_mac(machine_name, &mac, MACVLAN_HASH_KEY, idx++); | |
571 | if (r < 0) | |
572 | return log_error_errno(r, "Failed to create MACVLAN MAC address: %m"); | |
573 | ||
574 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); | |
575 | if (r < 0) | |
576 | return log_error_errno(r, "Failed to allocate netlink message: %m"); | |
577 | ||
578 | r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi); | |
579 | if (r < 0) | |
580 | return log_error_errno(r, "Failed to add netlink interface index: %m"); | |
581 | ||
b910cc72 | 582 | n = strjoin("mv-", *i); |
9a2a5625 LP |
583 | if (!n) |
584 | return log_oom(); | |
585 | ||
6b50cb5c YW |
586 | r = shorten_ifname(n); |
587 | if (r > 0) { | |
588 | a = strjoin("mv-", *i); | |
589 | if (!a) | |
590 | return log_oom(); | |
591 | } | |
9a2a5625 LP |
592 | |
593 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, n); | |
594 | if (r < 0) | |
595 | return log_error_errno(r, "Failed to add netlink interface name: %m"); | |
596 | ||
597 | r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac); | |
598 | if (r < 0) | |
599 | return log_error_errno(r, "Failed to add netlink MAC address: %m"); | |
600 | ||
601 | r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); | |
602 | if (r < 0) | |
603 | return log_error_errno(r, "Failed to add netlink namespace field: %m"); | |
604 | ||
605 | r = sd_netlink_message_open_container(m, IFLA_LINKINFO); | |
606 | if (r < 0) | |
607 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
608 | ||
609 | r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "macvlan"); | |
610 | if (r < 0) | |
611 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
612 | ||
613 | r = sd_netlink_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE); | |
614 | if (r < 0) | |
615 | return log_error_errno(r, "Failed to append macvlan mode: %m"); | |
616 | ||
617 | r = sd_netlink_message_close_container(m); | |
618 | if (r < 0) | |
619 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
620 | ||
621 | r = sd_netlink_message_close_container(m); | |
622 | if (r < 0) | |
623 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
624 | ||
625 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
626 | if (r < 0) | |
627 | return log_error_errno(r, "Failed to add new macvlan interfaces: %m"); | |
6b50cb5c YW |
628 | |
629 | (void) set_alternative_ifname(rtnl, n, a); | |
9a2a5625 LP |
630 | } |
631 | ||
632 | return 0; | |
633 | } | |
634 | ||
635 | int setup_ipvlan(const char *machine_name, pid_t pid, char **ifaces) { | |
4afd3348 | 636 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
9a2a5625 LP |
637 | char **i; |
638 | int r; | |
639 | ||
640 | if (strv_isempty(ifaces)) | |
641 | return 0; | |
642 | ||
643 | r = sd_netlink_open(&rtnl); | |
644 | if (r < 0) | |
645 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
646 | ||
9a2a5625 | 647 | STRV_FOREACH(i, ifaces) { |
4afd3348 | 648 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
6b50cb5c | 649 | _cleanup_free_ char *n = NULL, *a = NULL; |
9a2a5625 LP |
650 | int ifi; |
651 | ||
d308bb99 | 652 | ifi = resolve_interface_or_warn(&rtnl, *i); |
9a2a5625 LP |
653 | if (ifi < 0) |
654 | return ifi; | |
655 | ||
656 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); | |
657 | if (r < 0) | |
658 | return log_error_errno(r, "Failed to allocate netlink message: %m"); | |
659 | ||
660 | r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi); | |
661 | if (r < 0) | |
662 | return log_error_errno(r, "Failed to add netlink interface index: %m"); | |
663 | ||
b910cc72 | 664 | n = strjoin("iv-", *i); |
9a2a5625 LP |
665 | if (!n) |
666 | return log_oom(); | |
667 | ||
6b50cb5c YW |
668 | r = shorten_ifname(n); |
669 | if (r > 0) { | |
670 | a = strjoin("iv-", *i); | |
671 | if (!a) | |
672 | return log_oom(); | |
673 | } | |
9a2a5625 LP |
674 | |
675 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, n); | |
676 | if (r < 0) | |
677 | return log_error_errno(r, "Failed to add netlink interface name: %m"); | |
678 | ||
679 | r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); | |
680 | if (r < 0) | |
681 | return log_error_errno(r, "Failed to add netlink namespace field: %m"); | |
682 | ||
683 | r = sd_netlink_message_open_container(m, IFLA_LINKINFO); | |
684 | if (r < 0) | |
685 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
686 | ||
687 | r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "ipvlan"); | |
688 | if (r < 0) | |
689 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
690 | ||
691 | r = sd_netlink_message_append_u16(m, IFLA_IPVLAN_MODE, IPVLAN_MODE_L2); | |
692 | if (r < 0) | |
693 | return log_error_errno(r, "Failed to add ipvlan mode: %m"); | |
694 | ||
695 | r = sd_netlink_message_close_container(m); | |
696 | if (r < 0) | |
697 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
698 | ||
699 | r = sd_netlink_message_close_container(m); | |
700 | if (r < 0) | |
701 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
702 | ||
703 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
704 | if (r < 0) | |
705 | return log_error_errno(r, "Failed to add new ipvlan interfaces: %m"); | |
6b50cb5c YW |
706 | |
707 | (void) set_alternative_ifname(rtnl, n, a); | |
9a2a5625 LP |
708 | } |
709 | ||
710 | return 0; | |
711 | } | |
f6d6bad1 LP |
712 | |
713 | int veth_extra_parse(char ***l, const char *p) { | |
714 | _cleanup_free_ char *a = NULL, *b = NULL; | |
715 | int r; | |
716 | ||
717 | r = extract_first_word(&p, &a, ":", EXTRACT_DONT_COALESCE_SEPARATORS); | |
718 | if (r < 0) | |
719 | return r; | |
ef76dff2 | 720 | if (r == 0 || !ifname_valid(a)) |
f6d6bad1 LP |
721 | return -EINVAL; |
722 | ||
723 | r = extract_first_word(&p, &b, ":", EXTRACT_DONT_COALESCE_SEPARATORS); | |
724 | if (r < 0) | |
725 | return r; | |
ef76dff2 | 726 | if (r == 0 || !ifname_valid(b)) { |
f6d6bad1 LP |
727 | free(b); |
728 | b = strdup(a); | |
729 | if (!b) | |
730 | return -ENOMEM; | |
731 | } | |
732 | ||
733 | if (p) | |
734 | return -EINVAL; | |
735 | ||
736 | r = strv_push_pair(l, a, b); | |
737 | if (r < 0) | |
738 | return -ENOMEM; | |
739 | ||
740 | a = b = NULL; | |
741 | return 0; | |
742 | } | |
ef3b2aa7 | 743 | |
ef3b2aa7 LP |
744 | int remove_veth_links(const char *primary, char **pairs) { |
745 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; | |
746 | char **a, **b; | |
747 | int r; | |
748 | ||
749 | /* In some cases the kernel might pin the veth links between host and container even after the namespace | |
750 | * died. Hence, let's better remove them explicitly too. */ | |
751 | ||
752 | if (isempty(primary) && strv_isempty(pairs)) | |
753 | return 0; | |
754 | ||
755 | r = sd_netlink_open(&rtnl); | |
756 | if (r < 0) | |
757 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
758 | ||
22b28dfd | 759 | remove_one_link(rtnl, primary); |
ef3b2aa7 LP |
760 | |
761 | STRV_FOREACH_PAIR(a, b, pairs) | |
22b28dfd | 762 | remove_one_link(rtnl, *a); |
ef3b2aa7 LP |
763 | |
764 | return 0; | |
765 | } |