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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
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" |
ef76dff2 LP |
21 | #include "socket-util.h" |
22 | #include "stat-util.h" | |
07630cea | 23 | #include "string-util.h" |
f55b0d3f | 24 | #include "strv.h" |
26208d5b | 25 | #include "udev-util.h" |
07630cea | 26 | #include "util.h" |
9a2a5625 LP |
27 | |
28 | #define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1) | |
29 | #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 |
30 | #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) |
31 | #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 | 32 | #define MACVLAN_HASH_KEY SD_ID128_MAKE(00,13,6d,bc,66,83,44,81,bb,0c,f9,51,1f,24,a6,6f) |
bc5ea049 | 33 | #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 | 34 | |
22b28dfd LP |
35 | static int remove_one_link(sd_netlink *rtnl, const char *name) { |
36 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; | |
37 | int r; | |
38 | ||
39 | if (isempty(name)) | |
40 | return 0; | |
41 | ||
42 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_DELLINK, 0); | |
43 | if (r < 0) | |
44 | return log_error_errno(r, "Failed to allocate netlink message: %m"); | |
45 | ||
46 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, name); | |
47 | if (r < 0) | |
48 | return log_error_errno(r, "Failed to add netlink interface name: %m"); | |
49 | ||
50 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
51 | if (r == -ENODEV) /* Already gone */ | |
52 | return 0; | |
53 | if (r < 0) | |
54 | return log_error_errno(r, "Failed to remove interface %s: %m", name); | |
55 | ||
56 | return 1; | |
57 | } | |
58 | ||
9a2a5625 LP |
59 | static int generate_mac( |
60 | const char *machine_name, | |
61 | struct ether_addr *mac, | |
62 | sd_id128_t hash_key, | |
63 | uint64_t idx) { | |
64 | ||
dbe81cbd | 65 | uint64_t result; |
9a2a5625 LP |
66 | size_t l, sz; |
67 | uint8_t *v, *i; | |
68 | int r; | |
69 | ||
70 | l = strlen(machine_name); | |
71 | sz = sizeof(sd_id128_t) + l; | |
72 | if (idx > 0) | |
73 | sz += sizeof(idx); | |
74 | ||
6e9417f5 | 75 | v = newa(uint8_t, sz); |
9a2a5625 LP |
76 | |
77 | /* fetch some persistent data unique to the host */ | |
78 | r = sd_id128_get_machine((sd_id128_t*) v); | |
79 | if (r < 0) | |
80 | return r; | |
81 | ||
82 | /* combine with some data unique (on this host) to this | |
83 | * container instance */ | |
84 | i = mempcpy(v + sizeof(sd_id128_t), machine_name, l); | |
85 | if (idx > 0) { | |
86 | idx = htole64(idx); | |
87 | memcpy(i, &idx, sizeof(idx)); | |
88 | } | |
89 | ||
90 | /* Let's hash the host machine ID plus the container name. We | |
91 | * use a fixed, but originally randomly created hash key here. */ | |
933f9cae | 92 | result = htole64(siphash24(v, sz, hash_key.bytes)); |
9a2a5625 LP |
93 | |
94 | assert_cc(ETH_ALEN <= sizeof(result)); | |
dbe81cbd | 95 | memcpy(mac->ether_addr_octet, &result, ETH_ALEN); |
9a2a5625 LP |
96 | |
97 | /* see eth_random_addr in the kernel */ | |
98 | mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */ | |
99 | mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
6b50cb5c YW |
104 | static int set_alternative_ifname(sd_netlink *rtnl, const char *ifname, const char *altifname) { |
105 | int r; | |
106 | ||
107 | assert(rtnl); | |
108 | assert(ifname); | |
109 | ||
110 | if (!altifname) | |
111 | return 0; | |
112 | ||
113 | if (strlen(altifname) >= ALTIFNAMSIZ) | |
114 | return log_warning_errno(SYNTHETIC_ERRNO(ERANGE), | |
115 | "Alternative interface name '%s' for '%s' is too long, ignoring", | |
116 | altifname, ifname); | |
117 | ||
118 | r = rtnl_set_link_alternative_names_by_ifname(&rtnl, ifname, STRV_MAKE(altifname)); | |
119 | if (r < 0) | |
120 | return log_warning_errno(r, | |
121 | "Failed to set alternative interface name '%s' to '%s', ignoring: %m", | |
122 | altifname, ifname); | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
f6d6bad1 LP |
127 | static int add_veth( |
128 | sd_netlink *rtnl, | |
129 | pid_t pid, | |
130 | const char *ifname_host, | |
6b50cb5c | 131 | const char *altifname_host, |
f6d6bad1 LP |
132 | const struct ether_addr *mac_host, |
133 | const char *ifname_container, | |
134 | const struct ether_addr *mac_container) { | |
9a2a5625 | 135 | |
4afd3348 | 136 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
f6d6bad1 | 137 | int r; |
9a2a5625 | 138 | |
f6d6bad1 LP |
139 | assert(rtnl); |
140 | assert(ifname_host); | |
141 | assert(mac_host); | |
142 | assert(ifname_container); | |
143 | assert(mac_container); | |
9a2a5625 LP |
144 | |
145 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); | |
146 | if (r < 0) | |
147 | return log_error_errno(r, "Failed to allocate netlink message: %m"); | |
148 | ||
f6d6bad1 | 149 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, ifname_host); |
9a2a5625 LP |
150 | if (r < 0) |
151 | return log_error_errno(r, "Failed to add netlink interface name: %m"); | |
152 | ||
f6d6bad1 | 153 | r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, mac_host); |
9a2a5625 LP |
154 | if (r < 0) |
155 | return log_error_errno(r, "Failed to add netlink MAC address: %m"); | |
156 | ||
157 | r = sd_netlink_message_open_container(m, IFLA_LINKINFO); | |
158 | if (r < 0) | |
159 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
160 | ||
161 | r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "veth"); | |
162 | if (r < 0) | |
163 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
164 | ||
165 | r = sd_netlink_message_open_container(m, VETH_INFO_PEER); | |
166 | if (r < 0) | |
167 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
168 | ||
f6d6bad1 | 169 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, ifname_container); |
9a2a5625 LP |
170 | if (r < 0) |
171 | return log_error_errno(r, "Failed to add netlink interface name: %m"); | |
172 | ||
f6d6bad1 | 173 | r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, mac_container); |
9a2a5625 LP |
174 | if (r < 0) |
175 | return log_error_errno(r, "Failed to add netlink MAC address: %m"); | |
176 | ||
177 | r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); | |
178 | if (r < 0) | |
179 | return log_error_errno(r, "Failed to add netlink namespace field: %m"); | |
180 | ||
181 | r = sd_netlink_message_close_container(m); | |
182 | if (r < 0) | |
183 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
184 | ||
185 | r = sd_netlink_message_close_container(m); | |
186 | if (r < 0) | |
187 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
188 | ||
189 | r = sd_netlink_message_close_container(m); | |
190 | if (r < 0) | |
191 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
192 | ||
193 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
194 | if (r < 0) | |
f6d6bad1 LP |
195 | return log_error_errno(r, "Failed to add new veth interfaces (%s:%s): %m", ifname_host, ifname_container); |
196 | ||
6b50cb5c YW |
197 | (void) set_alternative_ifname(rtnl, ifname_host, altifname_host); |
198 | ||
f6d6bad1 LP |
199 | return 0; |
200 | } | |
201 | ||
bc5ea049 KK |
202 | /* This is almost base64char(), but not entirely, as it uses the "url and filename safe" alphabet, since we |
203 | * don't want "/" appear in interface names (since interfaces appear in sysfs as filenames). See section #5 | |
204 | * of RFC 4648. */ | |
205 | static char urlsafe_base64char(int x) { | |
206 | static const char table[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
207 | "abcdefghijklmnopqrstuvwxyz" | |
208 | "0123456789-_"; | |
209 | return table[x & 63]; | |
210 | } | |
211 | ||
6b50cb5c | 212 | static int shorten_ifname(char *ifname) { |
bc5ea049 KK |
213 | char new_ifname[IFNAMSIZ]; |
214 | ||
215 | assert(ifname); | |
216 | ||
217 | if (strlen(ifname) < IFNAMSIZ) /* Name is short enough */ | |
6b50cb5c | 218 | return 0; |
bc5ea049 KK |
219 | |
220 | if (naming_scheme_has(NAMING_NSPAWN_LONG_HASH)) { | |
221 | uint64_t h; | |
222 | ||
223 | /* Calculate 64bit hash value */ | |
224 | h = siphash24(ifname, strlen(ifname), SHORTEN_IFNAME_HASH_KEY.bytes); | |
225 | ||
226 | /* Set the final four bytes (i.e. 32bit) to the lower 24bit of the hash, encoded in url-safe base64 */ | |
227 | memcpy(new_ifname, ifname, IFNAMSIZ - 5); | |
228 | new_ifname[IFNAMSIZ - 5] = urlsafe_base64char(h >> 18); | |
229 | new_ifname[IFNAMSIZ - 4] = urlsafe_base64char(h >> 12); | |
230 | new_ifname[IFNAMSIZ - 3] = urlsafe_base64char(h >> 6); | |
231 | new_ifname[IFNAMSIZ - 2] = urlsafe_base64char(h); | |
232 | } else | |
233 | /* On old nspawn versions we just truncated the name, provide compatibility */ | |
234 | memcpy(new_ifname, ifname, IFNAMSIZ-1); | |
235 | ||
236 | new_ifname[IFNAMSIZ - 1] = 0; | |
237 | ||
238 | /* Log the incident to make it more discoverable */ | |
239 | log_warning("Network interface name '%s' has been changed to '%s' to fit length constraints.", ifname, new_ifname); | |
240 | ||
241 | strcpy(ifname, new_ifname); | |
6b50cb5c | 242 | return 1; |
bc5ea049 KK |
243 | } |
244 | ||
f6d6bad1 LP |
245 | int setup_veth(const char *machine_name, |
246 | pid_t pid, | |
247 | char iface_name[IFNAMSIZ], | |
248 | bool bridge) { | |
249 | ||
4afd3348 | 250 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
f6d6bad1 | 251 | struct ether_addr mac_host, mac_container; |
bc5ea049 | 252 | unsigned u; |
6b50cb5c | 253 | char *n, *a = NULL; |
bc5ea049 | 254 | int r; |
f6d6bad1 LP |
255 | |
256 | assert(machine_name); | |
257 | assert(pid > 0); | |
258 | assert(iface_name); | |
259 | ||
260 | /* Use two different interface name prefixes depending whether | |
261 | * we are in bridge mode or not. */ | |
bc5ea049 | 262 | n = strjoina(bridge ? "vb-" : "ve-", machine_name); |
6b50cb5c YW |
263 | r = shorten_ifname(n); |
264 | if (r > 0) | |
265 | a = strjoina(bridge ? "vb-" : "ve-", machine_name); | |
f6d6bad1 LP |
266 | |
267 | r = generate_mac(machine_name, &mac_container, CONTAINER_HASH_KEY, 0); | |
268 | if (r < 0) | |
269 | return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m"); | |
270 | ||
271 | r = generate_mac(machine_name, &mac_host, HOST_HASH_KEY, 0); | |
272 | if (r < 0) | |
273 | return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m"); | |
274 | ||
275 | r = sd_netlink_open(&rtnl); | |
276 | if (r < 0) | |
277 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
278 | ||
6b50cb5c | 279 | r = add_veth(rtnl, pid, n, a, &mac_host, "host0", &mac_container); |
f6d6bad1 LP |
280 | if (r < 0) |
281 | return r; | |
9a2a5625 | 282 | |
bc5ea049 KK |
283 | u = if_nametoindex(n); |
284 | if (u == 0) | |
285 | return log_error_errno(errno, "Failed to resolve interface %s: %m", n); | |
9a2a5625 | 286 | |
bc5ea049 KK |
287 | strcpy(iface_name, n); |
288 | return (int) u; | |
9a2a5625 LP |
289 | } |
290 | ||
f6d6bad1 LP |
291 | int setup_veth_extra( |
292 | const char *machine_name, | |
293 | pid_t pid, | |
294 | char **pairs) { | |
295 | ||
4afd3348 | 296 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
f6d6bad1 LP |
297 | uint64_t idx = 0; |
298 | char **a, **b; | |
299 | int r; | |
300 | ||
301 | assert(machine_name); | |
302 | assert(pid > 0); | |
303 | ||
304 | if (strv_isempty(pairs)) | |
305 | return 0; | |
306 | ||
307 | r = sd_netlink_open(&rtnl); | |
308 | if (r < 0) | |
309 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
310 | ||
311 | STRV_FOREACH_PAIR(a, b, pairs) { | |
312 | struct ether_addr mac_host, mac_container; | |
313 | ||
314 | r = generate_mac(machine_name, &mac_container, VETH_EXTRA_CONTAINER_HASH_KEY, idx); | |
315 | if (r < 0) | |
316 | return log_error_errno(r, "Failed to generate predictable MAC address for container side of extra veth link: %m"); | |
317 | ||
318 | r = generate_mac(machine_name, &mac_host, VETH_EXTRA_HOST_HASH_KEY, idx); | |
319 | if (r < 0) | |
320 | return log_error_errno(r, "Failed to generate predictable MAC address for container side of extra veth link: %m"); | |
321 | ||
6b50cb5c | 322 | r = add_veth(rtnl, pid, *a, NULL, &mac_host, *b, &mac_container); |
f6d6bad1 LP |
323 | if (r < 0) |
324 | return r; | |
325 | ||
313cefa1 | 326 | idx++; |
f6d6bad1 LP |
327 | } |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
22b28dfd | 332 | static int join_bridge(sd_netlink *rtnl, const char *veth_name, const char *bridge_name) { |
4afd3348 | 333 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
9a2a5625 LP |
334 | int r, bridge_ifi; |
335 | ||
22b28dfd | 336 | assert(rtnl); |
9a2a5625 LP |
337 | assert(veth_name); |
338 | assert(bridge_name); | |
339 | ||
597da51b ZJS |
340 | bridge_ifi = parse_ifindex_or_ifname(bridge_name); |
341 | if (bridge_ifi < 0) | |
342 | return bridge_ifi; | |
9a2a5625 LP |
343 | |
344 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0); | |
345 | if (r < 0) | |
22b28dfd | 346 | return r; |
9a2a5625 LP |
347 | |
348 | r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP); | |
349 | if (r < 0) | |
22b28dfd | 350 | return r; |
9a2a5625 LP |
351 | |
352 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, veth_name); | |
353 | if (r < 0) | |
22b28dfd | 354 | return r; |
9a2a5625 LP |
355 | |
356 | r = sd_netlink_message_append_u32(m, IFLA_MASTER, bridge_ifi); | |
357 | if (r < 0) | |
22b28dfd | 358 | return r; |
9a2a5625 LP |
359 | |
360 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
361 | if (r < 0) | |
22b28dfd | 362 | return r; |
9a2a5625 LP |
363 | |
364 | return bridge_ifi; | |
365 | } | |
366 | ||
22b28dfd LP |
367 | static int create_bridge(sd_netlink *rtnl, const char *bridge_name) { |
368 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; | |
369 | int r; | |
370 | ||
371 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); | |
372 | if (r < 0) | |
373 | return r; | |
374 | ||
375 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, bridge_name); | |
376 | if (r < 0) | |
377 | return r; | |
378 | ||
379 | r = sd_netlink_message_open_container(m, IFLA_LINKINFO); | |
380 | if (r < 0) | |
381 | return r; | |
382 | ||
383 | r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "bridge"); | |
384 | if (r < 0) | |
385 | return r; | |
386 | ||
387 | r = sd_netlink_message_close_container(m); | |
388 | if (r < 0) | |
389 | return r; | |
390 | ||
391 | r = sd_netlink_message_close_container(m); | |
392 | if (r < 0) | |
393 | return r; | |
394 | ||
395 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
396 | if (r < 0) | |
397 | return r; | |
398 | ||
399 | return 0; | |
400 | } | |
401 | ||
402 | int setup_bridge(const char *veth_name, const char *bridge_name, bool create) { | |
8e766630 | 403 | _cleanup_(release_lock_file) LockFile bridge_lock = LOCK_FILE_INIT; |
22b28dfd LP |
404 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
405 | int r, bridge_ifi; | |
406 | unsigned n = 0; | |
407 | ||
408 | assert(veth_name); | |
409 | assert(bridge_name); | |
410 | ||
411 | r = sd_netlink_open(&rtnl); | |
412 | if (r < 0) | |
413 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
414 | ||
415 | if (create) { | |
416 | /* We take a system-wide lock here, so that we can safely check whether there's still a member in the | |
6dd6a9c4 | 417 | * bridge before removing it, without risking interference from other nspawn instances. */ |
22b28dfd LP |
418 | |
419 | r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock); | |
420 | if (r < 0) | |
421 | return log_error_errno(r, "Failed to take network zone lock: %m"); | |
422 | } | |
423 | ||
424 | for (;;) { | |
425 | bridge_ifi = join_bridge(rtnl, veth_name, bridge_name); | |
426 | if (bridge_ifi >= 0) | |
427 | return bridge_ifi; | |
428 | if (bridge_ifi != -ENODEV || !create || n > 10) | |
429 | return log_error_errno(bridge_ifi, "Failed to add interface %s to bridge %s: %m", veth_name, bridge_name); | |
430 | ||
431 | /* Count attempts, so that we don't enter an endless loop here. */ | |
432 | n++; | |
433 | ||
434 | /* The bridge doesn't exist yet. Let's create it */ | |
435 | r = create_bridge(rtnl, bridge_name); | |
436 | if (r < 0) | |
437 | return log_error_errno(r, "Failed to create bridge interface %s: %m", bridge_name); | |
438 | ||
439 | /* Try again, now that the bridge exists */ | |
440 | } | |
441 | } | |
442 | ||
443 | int remove_bridge(const char *bridge_name) { | |
8e766630 | 444 | _cleanup_(release_lock_file) LockFile bridge_lock = LOCK_FILE_INIT; |
22b28dfd LP |
445 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
446 | const char *path; | |
447 | int r; | |
448 | ||
449 | /* Removes the specified bridge, but only if it is currently empty */ | |
450 | ||
451 | if (isempty(bridge_name)) | |
452 | return 0; | |
453 | ||
454 | r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock); | |
455 | if (r < 0) | |
456 | return log_error_errno(r, "Failed to take network zone lock: %m"); | |
457 | ||
458 | path = strjoina("/sys/class/net/", bridge_name, "/brif"); | |
459 | ||
460 | r = dir_is_empty(path); | |
461 | if (r == -ENOENT) /* Already gone? */ | |
462 | return 0; | |
463 | if (r < 0) | |
464 | return log_error_errno(r, "Can't detect if bridge %s is empty: %m", bridge_name); | |
465 | if (r == 0) /* Still populated, leave it around */ | |
466 | return 0; | |
467 | ||
468 | r = sd_netlink_open(&rtnl); | |
469 | if (r < 0) | |
470 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
471 | ||
472 | return remove_one_link(rtnl, bridge_name); | |
473 | } | |
474 | ||
f55b0d3f | 475 | static int parse_interface(const char *name) { |
597da51b | 476 | int ifi; |
9a2a5625 | 477 | |
597da51b ZJS |
478 | ifi = parse_ifindex_or_ifname(name); |
479 | if (ifi < 0) | |
480 | return log_error_errno(ifi, "Failed to resolve interface %s: %m", name); | |
9a2a5625 | 481 | |
b390f178 DDM |
482 | return ifi; |
483 | } | |
f55b0d3f | 484 | |
b390f178 DDM |
485 | int test_network_interface_initialized(const char *name) { |
486 | _cleanup_(sd_device_unrefp) sd_device *d = NULL; | |
487 | int ifi, r; | |
488 | char ifi_str[2 + DECIMAL_STR_MAX(int)]; | |
26208d5b | 489 | |
b390f178 DDM |
490 | if (path_is_read_only_fs("/sys")) |
491 | return 0; | |
26208d5b | 492 | |
b390f178 | 493 | /* udev should be around. */ |
26208d5b | 494 | |
b390f178 DDM |
495 | ifi = parse_interface(name); |
496 | if (ifi < 0) | |
497 | return ifi; | |
9a2a5625 | 498 | |
b390f178 DDM |
499 | sprintf(ifi_str, "n%i", ifi); |
500 | r = sd_device_new_from_device_id(&d, ifi_str); | |
501 | if (r < 0) | |
502 | return log_error_errno(r, "Failed to get device %s: %m", name); | |
503 | ||
504 | r = sd_device_get_is_initialized(d); | |
505 | if (r < 0) | |
506 | return log_error_errno(r, "Failed to determine whether interface %s is initialized: %m", name); | |
507 | if (r == 0) | |
508 | return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Network interface %s is not initialized yet.", name); | |
509 | ||
510 | r = device_is_renaming(d); | |
511 | if (r < 0) | |
512 | return log_error_errno(r, "Failed to determine the interface %s is being renamed: %m", name); | |
513 | if (r > 0) | |
514 | return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Interface %s is being renamed.", name); | |
515 | ||
516 | return 0; | |
9a2a5625 LP |
517 | } |
518 | ||
5b4855ab | 519 | int move_network_interfaces(int netns_fd, char **ifaces) { |
4afd3348 | 520 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
9a2a5625 LP |
521 | char **i; |
522 | int r; | |
523 | ||
524 | if (strv_isempty(ifaces)) | |
525 | return 0; | |
526 | ||
527 | r = sd_netlink_open(&rtnl); | |
528 | if (r < 0) | |
529 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
530 | ||
9a2a5625 | 531 | STRV_FOREACH(i, ifaces) { |
4afd3348 | 532 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
9a2a5625 LP |
533 | int ifi; |
534 | ||
f55b0d3f | 535 | ifi = parse_interface(*i); |
9a2a5625 LP |
536 | if (ifi < 0) |
537 | return ifi; | |
538 | ||
539 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi); | |
540 | if (r < 0) | |
541 | return log_error_errno(r, "Failed to allocate netlink message: %m"); | |
542 | ||
5b4855ab | 543 | r = sd_netlink_message_append_u32(m, IFLA_NET_NS_FD, netns_fd); |
9a2a5625 | 544 | if (r < 0) |
5b4855ab | 545 | return log_error_errno(r, "Failed to append namespace fd to netlink message: %m"); |
9a2a5625 LP |
546 | |
547 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
548 | if (r < 0) | |
549 | return log_error_errno(r, "Failed to move interface %s to namespace: %m", *i); | |
550 | } | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
555 | int setup_macvlan(const char *machine_name, pid_t pid, char **ifaces) { | |
4afd3348 | 556 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
9a2a5625 LP |
557 | unsigned idx = 0; |
558 | char **i; | |
559 | int r; | |
560 | ||
561 | if (strv_isempty(ifaces)) | |
562 | return 0; | |
563 | ||
564 | r = sd_netlink_open(&rtnl); | |
565 | if (r < 0) | |
566 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
567 | ||
9a2a5625 | 568 | STRV_FOREACH(i, ifaces) { |
4afd3348 | 569 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
6b50cb5c | 570 | _cleanup_free_ char *n = NULL, *a = NULL; |
9a2a5625 LP |
571 | struct ether_addr mac; |
572 | int ifi; | |
573 | ||
f55b0d3f | 574 | ifi = parse_interface(*i); |
9a2a5625 LP |
575 | if (ifi < 0) |
576 | return ifi; | |
577 | ||
578 | r = generate_mac(machine_name, &mac, MACVLAN_HASH_KEY, idx++); | |
579 | if (r < 0) | |
580 | return log_error_errno(r, "Failed to create MACVLAN MAC address: %m"); | |
581 | ||
582 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); | |
583 | if (r < 0) | |
584 | return log_error_errno(r, "Failed to allocate netlink message: %m"); | |
585 | ||
586 | r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi); | |
587 | if (r < 0) | |
588 | return log_error_errno(r, "Failed to add netlink interface index: %m"); | |
589 | ||
b910cc72 | 590 | n = strjoin("mv-", *i); |
9a2a5625 LP |
591 | if (!n) |
592 | return log_oom(); | |
593 | ||
6b50cb5c YW |
594 | r = shorten_ifname(n); |
595 | if (r > 0) { | |
596 | a = strjoin("mv-", *i); | |
597 | if (!a) | |
598 | return log_oom(); | |
599 | } | |
9a2a5625 LP |
600 | |
601 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, n); | |
602 | if (r < 0) | |
603 | return log_error_errno(r, "Failed to add netlink interface name: %m"); | |
604 | ||
605 | r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac); | |
606 | if (r < 0) | |
607 | return log_error_errno(r, "Failed to add netlink MAC address: %m"); | |
608 | ||
609 | r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); | |
610 | if (r < 0) | |
611 | return log_error_errno(r, "Failed to add netlink namespace field: %m"); | |
612 | ||
613 | r = sd_netlink_message_open_container(m, IFLA_LINKINFO); | |
614 | if (r < 0) | |
615 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
616 | ||
617 | r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "macvlan"); | |
618 | if (r < 0) | |
619 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
620 | ||
621 | r = sd_netlink_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE); | |
622 | if (r < 0) | |
623 | return log_error_errno(r, "Failed to append macvlan mode: %m"); | |
624 | ||
625 | r = sd_netlink_message_close_container(m); | |
626 | if (r < 0) | |
627 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
628 | ||
629 | r = sd_netlink_message_close_container(m); | |
630 | if (r < 0) | |
631 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
632 | ||
633 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
634 | if (r < 0) | |
635 | return log_error_errno(r, "Failed to add new macvlan interfaces: %m"); | |
6b50cb5c YW |
636 | |
637 | (void) set_alternative_ifname(rtnl, n, a); | |
9a2a5625 LP |
638 | } |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
643 | int setup_ipvlan(const char *machine_name, pid_t pid, char **ifaces) { | |
4afd3348 | 644 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
9a2a5625 LP |
645 | char **i; |
646 | int r; | |
647 | ||
648 | if (strv_isempty(ifaces)) | |
649 | return 0; | |
650 | ||
651 | r = sd_netlink_open(&rtnl); | |
652 | if (r < 0) | |
653 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
654 | ||
9a2a5625 | 655 | STRV_FOREACH(i, ifaces) { |
4afd3348 | 656 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
6b50cb5c | 657 | _cleanup_free_ char *n = NULL, *a = NULL; |
9a2a5625 LP |
658 | int ifi; |
659 | ||
f55b0d3f | 660 | ifi = parse_interface(*i); |
9a2a5625 LP |
661 | if (ifi < 0) |
662 | return ifi; | |
663 | ||
664 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); | |
665 | if (r < 0) | |
666 | return log_error_errno(r, "Failed to allocate netlink message: %m"); | |
667 | ||
668 | r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi); | |
669 | if (r < 0) | |
670 | return log_error_errno(r, "Failed to add netlink interface index: %m"); | |
671 | ||
b910cc72 | 672 | n = strjoin("iv-", *i); |
9a2a5625 LP |
673 | if (!n) |
674 | return log_oom(); | |
675 | ||
6b50cb5c YW |
676 | r = shorten_ifname(n); |
677 | if (r > 0) { | |
678 | a = strjoin("iv-", *i); | |
679 | if (!a) | |
680 | return log_oom(); | |
681 | } | |
9a2a5625 LP |
682 | |
683 | r = sd_netlink_message_append_string(m, IFLA_IFNAME, n); | |
684 | if (r < 0) | |
685 | return log_error_errno(r, "Failed to add netlink interface name: %m"); | |
686 | ||
687 | r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); | |
688 | if (r < 0) | |
689 | return log_error_errno(r, "Failed to add netlink namespace field: %m"); | |
690 | ||
691 | r = sd_netlink_message_open_container(m, IFLA_LINKINFO); | |
692 | if (r < 0) | |
693 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
694 | ||
695 | r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "ipvlan"); | |
696 | if (r < 0) | |
697 | return log_error_errno(r, "Failed to open netlink container: %m"); | |
698 | ||
699 | r = sd_netlink_message_append_u16(m, IFLA_IPVLAN_MODE, IPVLAN_MODE_L2); | |
700 | if (r < 0) | |
701 | return log_error_errno(r, "Failed to add ipvlan mode: %m"); | |
702 | ||
703 | r = sd_netlink_message_close_container(m); | |
704 | if (r < 0) | |
705 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
706 | ||
707 | r = sd_netlink_message_close_container(m); | |
708 | if (r < 0) | |
709 | return log_error_errno(r, "Failed to close netlink container: %m"); | |
710 | ||
711 | r = sd_netlink_call(rtnl, m, 0, NULL); | |
712 | if (r < 0) | |
713 | return log_error_errno(r, "Failed to add new ipvlan interfaces: %m"); | |
6b50cb5c YW |
714 | |
715 | (void) set_alternative_ifname(rtnl, n, a); | |
9a2a5625 LP |
716 | } |
717 | ||
718 | return 0; | |
719 | } | |
f6d6bad1 LP |
720 | |
721 | int veth_extra_parse(char ***l, const char *p) { | |
722 | _cleanup_free_ char *a = NULL, *b = NULL; | |
723 | int r; | |
724 | ||
725 | r = extract_first_word(&p, &a, ":", EXTRACT_DONT_COALESCE_SEPARATORS); | |
726 | if (r < 0) | |
727 | return r; | |
ef76dff2 | 728 | if (r == 0 || !ifname_valid(a)) |
f6d6bad1 LP |
729 | return -EINVAL; |
730 | ||
731 | r = extract_first_word(&p, &b, ":", EXTRACT_DONT_COALESCE_SEPARATORS); | |
732 | if (r < 0) | |
733 | return r; | |
ef76dff2 | 734 | if (r == 0 || !ifname_valid(b)) { |
f6d6bad1 LP |
735 | free(b); |
736 | b = strdup(a); | |
737 | if (!b) | |
738 | return -ENOMEM; | |
739 | } | |
740 | ||
741 | if (p) | |
742 | return -EINVAL; | |
743 | ||
744 | r = strv_push_pair(l, a, b); | |
745 | if (r < 0) | |
746 | return -ENOMEM; | |
747 | ||
748 | a = b = NULL; | |
749 | return 0; | |
750 | } | |
ef3b2aa7 | 751 | |
ef3b2aa7 LP |
752 | int remove_veth_links(const char *primary, char **pairs) { |
753 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; | |
754 | char **a, **b; | |
755 | int r; | |
756 | ||
757 | /* In some cases the kernel might pin the veth links between host and container even after the namespace | |
758 | * died. Hence, let's better remove them explicitly too. */ | |
759 | ||
760 | if (isempty(primary) && strv_isempty(pairs)) | |
761 | return 0; | |
762 | ||
763 | r = sd_netlink_open(&rtnl); | |
764 | if (r < 0) | |
765 | return log_error_errno(r, "Failed to connect to netlink: %m"); | |
766 | ||
22b28dfd | 767 | remove_one_link(rtnl, primary); |
ef3b2aa7 LP |
768 | |
769 | STRV_FOREACH_PAIR(a, b, pairs) | |
22b28dfd | 770 | remove_one_link(rtnl, *a); |
ef3b2aa7 LP |
771 | |
772 | return 0; | |
773 | } |