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network: check the size of hardware address before setting MAC address
[thirdparty/systemd.git] / src / network / networkd-setlink.c
CommitLineData
0fa8ee6c
YW		 1/* SPDX-License-Identifier: LGPL-2.1-or-later */
2
93fabc10
YW		 3#include <netinet/in.h>
4#include <linux/if.h>
7558f9e7 5#include <linux/if_arp.h>
93fabc10 6
0fa8ee6c
YW		 7#include "missing_network.h"
8#include "netlink-util.h"
7558f9e7 9#include "networkd-can.h"
0fa8ee6c
YW		 10#include "networkd-link.h"
11#include "networkd-manager.h"
12#include "networkd-queue.h"
13#include "string-table.h"
8e00e24c 14#include "sysctl-util.h"
0fa8ee6c
YW		 15
16static const char *const set_link_operation_table[_SET_LINK_OPERATION_MAX] = {
8e00e24c 17 [SET_LINK_ADDRESS_GENERATION_MODE] = "IPv6LL address generation mode",
5062b859 18 [SET_LINK_BOND] = "bond configurations",
7d5b232f 19 [SET_LINK_BRIDGE] = "bridge configurations",
8252fb44 20 [SET_LINK_BRIDGE_VLAN] = "bridge VLAN configurations",
7558f9e7 21 [SET_LINK_CAN] = "CAN interface configurations",
93fabc10 22 [SET_LINK_FLAGS] = "link flags",
cc4c8fb1 23 [SET_LINK_GROUP] = "interface group",
a8e5e27c 24 [SET_LINK_MAC] = "MAC address",
d24bf1b5 25 [SET_LINK_MASTER] = "master interface",
0fa8ee6c
YW		 26 [SET_LINK_MTU] = "MTU",
27};
28
29DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(set_link_operation, SetLinkOperation);
30
1362bd6c
YW		 31static int get_link_default_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
32 return link_getlink_handler_internal(rtnl, m, link, "Failed to sync link information");
33}
34
440d40dc
YW		 35static int get_link_master_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
36 if (get_link_default_handler(rtnl, m, link) > 0)
37 link->master_set = true;
38 return 0;
39}
40
baa95d22
YW		 41static int get_link_update_flag_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
42 assert(link);
43 assert(link->set_flags_messages > 0);
44
45 link->set_flags_messages--;
46
47 return get_link_default_handler(rtnl, m, link);
48}
49
1362bd6c
YW		 50static int set_link_handler_internal(
51 sd_netlink *rtnl,
52 sd_netlink_message *m,
53 Link *link,
54 SetLinkOperation op,
55 bool ignore,
56 link_netlink_message_handler_t get_link_handler) {
57
0fa8ee6c
YW		 58 int r;
59
60 assert(m);
61 assert(link);
62 assert(link->set_link_messages > 0);
63 assert(op >= 0 && op < _SET_LINK_OPERATION_MAX);
64
65 link->set_link_messages--;
66
67 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
baa95d22 68 goto on_error;
0fa8ee6c
YW		 69
70 r = sd_netlink_message_get_errno(m);
71 if (r < 0) {
72 const char *error_msg;
73
74 error_msg = strjoina("Failed to set ", set_link_operation_to_string(op), ignore ? ", ignoring" : "");
75 log_link_message_warning_errno(link, m, r, error_msg);
76
77 if (!ignore)
78 link_enter_failed(link);
baa95d22 79 goto on_error;
0fa8ee6c
YW		 80 }
81
82 log_link_debug(link, "%s set.", set_link_operation_to_string(op));
1362bd6c
YW		 83
84 if (get_link_handler) {
85 r = link_call_getlink(link, get_link_handler);
86 if (r < 0) {
87 link_enter_failed(link);
baa95d22 88 goto on_error;
1362bd6c
YW		 89 }
90 }
91
92 if (link->set_link_messages == 0)
93 link_check_ready(link);
94
0fa8ee6c 95 return 1;
baa95d22
YW		 96
97on_error:
98 if (op == SET_LINK_FLAGS) {
99 assert(link->set_flags_messages > 0);
100 link->set_flags_messages--;
101 }
102
103 return 0;
0fa8ee6c
YW		 104}
105
8e00e24c
YW		 106static int link_set_addrgen_mode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
107 int r;
108
1362bd6c 109 r = set_link_handler_internal(rtnl, m, link, SET_LINK_ADDRESS_GENERATION_MODE, true, NULL);
8e00e24c
YW		 110 if (r <= 0)
111 return r;
112
113 r = link_drop_ipv6ll_addresses(link);
114 if (r < 0) {
115 log_link_warning_errno(link, r, "Failed to drop IPv6LL addresses: %m");
116 link_enter_failed(link);
117 }
118
119 return 0;
120}
121
5062b859 122static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2a057a73 123 return set_link_handler_internal(rtnl, m, link, SET_LINK_BOND, false, NULL);
5062b859
YW		 124}
125
7d5b232f 126static int link_set_bridge_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2a057a73 127 return set_link_handler_internal(rtnl, m, link, SET_LINK_BRIDGE, false, NULL);
7d5b232f
YW		 128}
129
8252fb44 130static int link_set_bridge_vlan_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2a057a73 131 return set_link_handler_internal(rtnl, m, link, SET_LINK_BRIDGE_VLAN, false, NULL);
8252fb44
YW		 132}
133
7558f9e7
YW		 134static int link_set_can_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
135 return set_link_handler_internal(rtnl, m, link, SET_LINK_CAN, false, NULL);
136}
137
93fabc10 138static int link_set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
baa95d22 139 return set_link_handler_internal(rtnl, m, link, SET_LINK_FLAGS, false, get_link_update_flag_handler);
93fabc10
YW		 140}
141
cc4c8fb1 142static int link_set_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2a057a73 143 return set_link_handler_internal(rtnl, m, link, SET_LINK_GROUP, false, NULL);
cc4c8fb1
YW		 144}
145
a8e5e27c 146static int link_set_mac_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1362bd6c 147 return set_link_handler_internal(rtnl, m, link, SET_LINK_MAC, true, get_link_default_handler);
a8e5e27c
YW		 148}
149
d24bf1b5 150static int link_set_master_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2a057a73 151 return set_link_handler_internal(rtnl, m, link, SET_LINK_MASTER, false, get_link_master_handler);
d24bf1b5
YW		 152}
153
0fa8ee6c
YW		 154static int link_set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
155 int r;
156
1362bd6c 157 r = set_link_handler_internal(rtnl, m, link, SET_LINK_MTU, true, get_link_default_handler);
0fa8ee6c
YW		 158 if (r <= 0)
159 return r;
160
161 /* The kernel resets ipv6 mtu after changing device mtu;
162 * we must set this here, after we've set device mtu */
163 r = link_set_ipv6_mtu(link);
164 if (r < 0)
165 log_link_warning_errno(link, r, "Failed to set IPv6 MTU, ignoring: %m");
166
0fa8ee6c
YW		 167 return 0;
168}
169
170static int link_configure(
171 Link *link,
172 SetLinkOperation op,
173 void *userdata,
174 link_netlink_message_handler_t callback) {
175
176 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
177 int r;
178
179 assert(link);
180 assert(link->manager);
181 assert(link->manager->rtnl);
182 assert(link->network);
183 assert(op >= 0 && op < _SET_LINK_OPERATION_MAX);
184 assert(callback);
185
186 log_link_debug(link, "Setting %s", set_link_operation_to_string(op));
187
7558f9e7 188 if (IN_SET(op, SET_LINK_BOND, SET_LINK_CAN)) {
5062b859
YW		 189 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->master_ifindex);
190 if (r < 0)
191 return log_link_debug_errno(link, r, "Could not allocate RTM_NEWLINK message: %m");
192 } else {
193 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
194 if (r < 0)
195 return log_link_debug_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
196 }
0fa8ee6c
YW		 197
198 switch (op) {
8e00e24c
YW		 199 case SET_LINK_ADDRESS_GENERATION_MODE:
200 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
201 if (r < 0)
202 return log_link_debug_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
203
204 r = sd_netlink_message_open_container(req, AF_INET6);
205 if (r < 0)
206 return log_link_debug_errno(link, r, "Could not open AF_INET6 container: %m");
207
208 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, PTR_TO_UINT8(userdata));
209 if (r < 0)
210 return log_link_debug_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE attribute: %m");
211
212 r = sd_netlink_message_close_container(req);
213 if (r < 0)
214 return log_link_debug_errno(link, r, "Could not close AF_INET6 container: %m");
215
216 r = sd_netlink_message_close_container(req);
217 if (r < 0)
218 return log_link_debug_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
219 break;
5062b859
YW		 220 case SET_LINK_BOND:
221 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
222 if (r < 0)
223 return log_link_debug_errno(link, r, "Could not set netlink message flags: %m");
224
225 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
226 if (r < 0)
227 return log_link_debug_errno(link, r, "Could not open IFLA_LINKINFO container: %m");
228
229 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
230 if (r < 0)
231 return log_link_debug_errno(link, r, "Could not open IFLA_INFO_DATA container: %m");
232
233 if (link->network->active_slave) {
234 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
235 if (r < 0)
236 return log_link_debug_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
237 }
238
239 if (link->network->primary_slave) {
240 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
241 if (r < 0)
242 return log_link_debug_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
243 }
244
245 r = sd_netlink_message_close_container(req);
246 if (r < 0)
247 return log_link_debug_errno(link, r, "Could not close IFLA_INFO_DATA container: %m");
248
249 r = sd_netlink_message_close_container(req);
250 if (r < 0)
251 return log_link_debug_errno(link, r, "Could not close IFLA_LINKINFO container: %m");
252
253 break;
7d5b232f
YW		 254 case SET_LINK_BRIDGE:
255 r = sd_rtnl_message_link_set_family(req, AF_BRIDGE);
256 if (r < 0)
257 return log_link_debug_errno(link, r, "Could not set message family: %m");
258
259 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
260 if (r < 0)
261 return log_link_debug_errno(link, r, "Could not open IFLA_PROTINFO container: %m");
262
263 if (link->network->use_bpdu >= 0) {
264 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
265 if (r < 0)
266 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
267 }
268
269 if (link->network->hairpin >= 0) {
270 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
271 if (r < 0)
272 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
273 }
274
275 if (link->network->fast_leave >= 0) {
276 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
277 if (r < 0)
278 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
279 }
280
281 if (link->network->allow_port_to_be_root >= 0) {
282 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
283 if (r < 0)
284 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
285 }
286
287 if (link->network->unicast_flood >= 0) {
288 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
289 if (r < 0)
290 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
291 }
292
293 if (link->network->multicast_flood >= 0) {
294 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_FLOOD, link->network->multicast_flood);
295 if (r < 0)
296 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_MCAST_FLOOD attribute: %m");
297 }
298
299 if (link->network->multicast_to_unicast >= 0) {
300 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
301 if (r < 0)
302 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
303 }
304
305 if (link->network->neighbor_suppression >= 0) {
306 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_NEIGH_SUPPRESS, link->network->neighbor_suppression);
307 if (r < 0)
308 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_NEIGH_SUPPRESS attribute: %m");
309 }
310
311 if (link->network->learning >= 0) {
312 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning);
313 if (r < 0)
314 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_LEARNING attribute: %m");
315 }
316
317 if (link->network->bridge_proxy_arp >= 0) {
318 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROXYARP, link->network->bridge_proxy_arp);
319 if (r < 0)
320 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_PROXYARP attribute: %m");
321 }
322
323 if (link->network->bridge_proxy_arp_wifi >= 0) {
324 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROXYARP_WIFI, link->network->bridge_proxy_arp_wifi);
325 if (r < 0)
326 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_PROXYARP_WIFI attribute: %m");
327 }
328
329 if (link->network->cost != 0) {
330 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
331 if (r < 0)
332 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
333 }
334
335 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
336 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
337 if (r < 0)
338 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
339 }
340
341 if (link->network->multicast_router != _MULTICAST_ROUTER_INVALID) {
342 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MULTICAST_ROUTER, link->network->multicast_router);
343 if (r < 0)
344 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_MULTICAST_ROUTER attribute: %m");
345 }
346
347 r = sd_netlink_message_close_container(req);
348 if (r < 0)
349 return log_link_debug_errno(link, r, "Could not close IFLA_PROTINFO container: %m");
350 break;
8252fb44
YW		 351 case SET_LINK_BRIDGE_VLAN:
352 r = sd_rtnl_message_link_set_family(req, AF_BRIDGE);
353 if (r < 0)
354 return log_link_debug_errno(link, r, "Could not set message family: %m");
355
356 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
357 if (r < 0)
358 return log_link_debug_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
359
360 if (!link->network->bridge) {
361 /* master needs BRIDGE_FLAGS_SELF flag*/
362 r = sd_netlink_message_append_u16(req, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF);
363 if (r < 0)
364 return log_link_debug_errno(link, r, "Could not append IFLA_BRIDGE_FLAGS attribute: %m");
365 }
366
367 r = bridge_vlan_append_info(link, req, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
368 if (r < 0)
369 return log_link_debug_errno(link, r, "Could not append VLANs: %m");
370
371 r = sd_netlink_message_close_container(req);
372 if (r < 0)
373 return log_link_debug_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
374
375 break;
7558f9e7
YW		 376 case SET_LINK_CAN:
377 r = can_set_netlink_message(link, req);
378 if (r < 0)
379 return r;
380 break;
93fabc10
YW		 381 case SET_LINK_FLAGS: {
382 unsigned ifi_change = 0, ifi_flags = 0;
383
384 if (link->network->arp >= 0) {
385 ifi_change |= IFF_NOARP;
386 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
387 }
388
389 if (link->network->multicast >= 0) {
390 ifi_change |= IFF_MULTICAST;
391 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
392 }
393
394 if (link->network->allmulticast >= 0) {
395 ifi_change |= IFF_ALLMULTI;
396 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
397 }
398
399 if (link->network->promiscuous >= 0) {
400 ifi_change |= IFF_PROMISC;
401 SET_FLAG(ifi_flags, IFF_PROMISC, link->network->promiscuous);
402 }
403
404 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
405 if (r < 0)
406 return log_link_debug_errno(link, r, "Could not set link flags: %m");
407
408 break;
409 }
cc4c8fb1
YW		 410 case SET_LINK_GROUP:
411 r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
412 if (r < 0)
413 return log_link_debug_errno(link, r, "Could not append IFLA_GROUP attribute: %m");
414 break;
a8e5e27c
YW		 415 case SET_LINK_MAC:
416 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
417 if (r < 0)
418 return log_link_debug_errno(link, r, "Could not append IFLA_ADDRESS attribute: %m");
419 break;
d24bf1b5
YW		 420 case SET_LINK_MASTER:
421 r = sd_netlink_message_append_u32(req, IFLA_MASTER, PTR_TO_UINT32(userdata));
422 if (r < 0)
423 return log_link_debug_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
424 break;
0fa8ee6c
YW		 425 case SET_LINK_MTU:
426 r = sd_netlink_message_append_u32(req, IFLA_MTU, PTR_TO_UINT32(userdata));
427 if (r < 0)
428 return log_link_debug_errno(link, r, "Could not append IFLA_MTU attribute: %m");
429 break;
430 default:
431 assert_not_reached("Invalid set link operation");
432 }
433
434 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
435 link_netlink_destroy_callback, link);
436 if (r < 0)
437 return log_link_debug_errno(link, r, "Could not send RTM_SETLINK message: %m");
438
439 link_ref(link);
440 return 0;
441}
442
d24bf1b5
YW		 443static bool netdev_is_ready(NetDev *netdev) {
444 assert(netdev);
445
446 if (netdev->state != NETDEV_STATE_READY)
447 return false;
448 if (netdev->ifindex == 0)
449 return false;
450
451 return true;
452}
453
0fa8ee6c 454static bool link_is_ready_to_call_set_link(Request *req) {
d24bf1b5 455 SetLinkOperation op;
0fa8ee6c 456 Link *link;
d24bf1b5 457 int r;
0fa8ee6c
YW		 458
459 assert(req);
460
461 link = req->link;
d24bf1b5 462 op = req->set_link_operation;
0fa8ee6c
YW		 463
464 if (!IN_SET(link->state, LINK_STATE_INITIALIZED, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
465 return false;
466
d24bf1b5 467 switch (op) {
440d40dc
YW		 468 case SET_LINK_BOND:
469 case SET_LINK_BRIDGE:
470 case SET_LINK_BRIDGE_VLAN:
471 if (!link->master_set)
472 return false;
473 break;
7558f9e7 474 case SET_LINK_CAN:
baa95d22
YW		 475 /* Do not check link->set_flgas_messages here, as it is ok even if link->flags
476 * is outdated, and checking the counter causes a deadlock. */
7558f9e7
YW		 477 if (FLAGS_SET(link->flags, IFF_UP)) {
478 /* The CAN interface must be down to configure bitrate, etc... */
479 r = link_down(link);
480 if (r < 0) {
481 link_enter_failed(link);
482 return false;
483 }
484 }
485 break;
d24bf1b5
YW		 486 case SET_LINK_MASTER: {
487 uint32_t m = 0;
488
489 assert(link->network);
490
491 if (link->network->batadv) {
492 if (!netdev_is_ready(link->network->batadv))
493 return false;
494 m = link->network->batadv->ifindex;
495 } else if (link->network->bond) {
496 if (!netdev_is_ready(link->network->bond))
497 return false;
498 m = link->network->bond->ifindex;
499
baa95d22
YW		 500 /* Do not check link->set_flgas_messages here, as it is ok even if link->flags
501 * is outdated, and checking the counter causes a deadlock. */
d24bf1b5
YW		 502 if (FLAGS_SET(link->flags, IFF_UP)) {
503 /* link must be down when joining to bond master. */
112a0972 504 r = link_down(link);
d24bf1b5
YW		 505 if (r < 0) {
506 link_enter_failed(link);
507 return false;
508 }
509 }
510 } else if (link->network->bridge) {
511 if (!netdev_is_ready(link->network->bridge))
512 return false;
513 m = link->network->bridge->ifindex;
514 } else if (link->network->vrf) {
515 if (!netdev_is_ready(link->network->vrf))
516 return false;
517 m = link->network->vrf->ifindex;
518 }
519
520 req->userdata = UINT32_TO_PTR(m);
521 break;
522 }
523 default:
524 break;
525 }
526
0fa8ee6c
YW		 527 return true;
528}
529
530int request_process_set_link(Request *req) {
531 int r;
532
533 assert(req);
534 assert(req->link);
535 assert(req->type == REQUEST_TYPE_SET_LINK);
536 assert(req->set_link_operation >= 0 && req->set_link_operation < _SET_LINK_OPERATION_MAX);
537 assert(req->netlink_handler);
538
539 if (!link_is_ready_to_call_set_link(req))
540 return 0;
541
542 r = link_configure(req->link, req->set_link_operation, req->userdata, req->netlink_handler);
543 if (r < 0)
544 return log_link_error_errno(req->link, r, "Failed to set %s: %m",
545 set_link_operation_to_string(req->set_link_operation));
546
baa95d22
YW		 547 if (req->set_link_operation == SET_LINK_FLAGS)
548 req->link->set_flags_messages++;
549
0fa8ee6c
YW		 550 return 1;
551}
552
553static int link_request_set_link(
554 Link *link,
555 SetLinkOperation op,
556 link_netlink_message_handler_t netlink_handler,
557 Request **ret) {
558
559 Request *req;
560 int r;
561
562 assert(link);
563 assert(op >= 0 && op < _SET_LINK_OPERATION_MAX);
564 assert(netlink_handler);
565
566 r = link_queue_request(link, REQUEST_TYPE_SET_LINK, INT_TO_PTR(op), false,
567 &link->set_link_messages, netlink_handler, &req);
568 if (r < 0)
569 return log_link_error_errno(link, r, "Failed to request to set %s: %m",
570 set_link_operation_to_string(op));
571
572 log_link_debug(link, "Requested to set %s", set_link_operation_to_string(op));
573
574 if (ret)
575 *ret = req;
576 return 0;
577}
578
8e00e24c
YW		 579int link_request_to_set_addrgen_mode(Link *link) {
580 Request *req;
581 uint8_t mode;
582 int r;
583
584 assert(link);
585 assert(link->network);
586
587 if (!socket_ipv6_is_supported())
588 return 0;
589
590 if (!link_ipv6ll_enabled(link))
591 mode = IN6_ADDR_GEN_MODE_NONE;
592 else if (link->network->ipv6ll_address_gen_mode >= 0)
593 mode = link->network->ipv6ll_address_gen_mode;
9e1432d5
YW		 594 else if (in6_addr_is_set(&link->network->ipv6ll_stable_secret))
595 mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
596 else
597 mode = IN6_ADDR_GEN_MODE_EUI64;
8e00e24c
YW		 598
599 r = link_request_set_link(link, SET_LINK_ADDRESS_GENERATION_MODE, link_set_addrgen_mode_handler, &req);
600 if (r < 0)
601 return r;
602
603 req->userdata = UINT8_TO_PTR(mode);
604 return 0;
605}
606
5062b859
YW		 607int link_request_to_set_bond(Link *link) {
608 assert(link);
609 assert(link->network);
610
611 if (!link->network->bond)
612 return 0;
613
614 return link_request_set_link(link, SET_LINK_BOND, link_set_bond_handler, NULL);
615}
616
7d5b232f
YW		 617int link_request_to_set_bridge(Link *link) {
618 assert(link);
619 assert(link->network);
620
621 if (!link->network->bridge)
622 return 0;
623
624 return link_request_set_link(link, SET_LINK_BRIDGE, link_set_bridge_handler, NULL);
625}
626
8252fb44
YW		 627int link_request_to_set_bridge_vlan(Link *link) {
628 assert(link);
629 assert(link->network);
630
631 if (!link->network->use_br_vlan)
632 return 0;
633
634 if (!link->network->bridge && !streq_ptr(link->kind, "bridge"))
635 return 0;
636
637 return link_request_set_link(link, SET_LINK_BRIDGE_VLAN, link_set_bridge_vlan_handler, NULL);
638}
639
7558f9e7
YW		 640int link_request_to_set_can(Link *link) {
641 assert(link);
642 assert(link->network);
643
644 if (link->iftype != ARPHRD_CAN)
645 return 0;
646
647 if (!streq_ptr(link->kind, "can"))
648 return 0;
649
650 return link_request_set_link(link, SET_LINK_CAN, link_set_can_handler, NULL);
651}
652
93fabc10
YW		 653int link_request_to_set_flags(Link *link) {
654 assert(link);
655 assert(link->network);
656
657 if (link->network->arp < 0 &&
658 link->network->multicast < 0 &&
659 link->network->allmulticast < 0 &&
660 link->network->promiscuous < 0)
661 return 0;
662
663 return link_request_set_link(link, SET_LINK_FLAGS, link_set_flags_handler, NULL);
664}
665
cc4c8fb1
YW		 666int link_request_to_set_group(Link *link) {
667 assert(link);
668 assert(link->network);
669
670 if (!link->network->group_set)
671 return 0;
672
673 return link_request_set_link(link, SET_LINK_GROUP, link_set_group_handler, NULL);
674}
675
a8e5e27c
YW		 676int link_request_to_set_mac(Link *link) {
677 assert(link);
678 assert(link->network);
679
680 if (!link->network->mac)
681 return 0;
682
5388e103
YW		 683 if (link->hw_addr.length != sizeof(struct ether_addr)) {
684 /* Note that for now we only support changing hardware addresses on Ethernet. */
685 log_link_debug(link, "Size of the hardware address (%zu) does not match the size of MAC address (%zu), ignoring.",
686 link->hw_addr.length, sizeof(struct ether_addr));
687 return 0;
688 }
689
690 if (ether_addr_equal(&link->hw_addr.ether, link->network->mac))
691 return 0;
692
a8e5e27c
YW		 693 return link_request_set_link(link, SET_LINK_MAC, link_set_mac_handler, NULL);
694}
695
d24bf1b5
YW		 696int link_request_to_set_master(Link *link) {
697 assert(link);
698
440d40dc
YW		 699 link->master_set = false;
700
d24bf1b5
YW		 701 return link_request_set_link(link, SET_LINK_MASTER, link_set_master_handler, NULL);
702}
703
0fa8ee6c 704int link_request_to_set_mtu(Link *link, uint32_t mtu) {
59ca71a9 705 Request *req;
717ba5fc
YW		 706 const char *origin;
707 uint32_t min_mtu;
0fa8ee6c
YW		 708 int r;
709
710 assert(link);
717ba5fc
YW		 711 assert(link->network);
712
713 min_mtu = link->min_mtu;
714 origin = "the minimum MTU of the interface";
715 if (link_ipv6_enabled(link)) {
716 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes on the interface. Bump up
717 * MTU bytes to IPV6_MTU_MIN. */
718 if (min_mtu < IPV6_MIN_MTU) {
719 min_mtu = IPV6_MIN_MTU;
720 origin = "the minimum IPv6 MTU";
721 }
722 if (min_mtu < link->network->ipv6_mtu) {
723 min_mtu = link->network->ipv6_mtu;
724 origin = "the requested IPv6 MTU in IPv6MTUBytes=";
725 }
726 }
727
728 if (mtu < min_mtu) {
729 log_link_warning(link, "Bumping the requested MTU %"PRIu32" to %s (%"PRIu32")",
730 mtu, origin, min_mtu);
731 mtu = min_mtu;
732 }
0fa8ee6c 733
717ba5fc
YW		 734 if (mtu > link->max_mtu) {
735 log_link_warning(link, "Reducing the requested MTU %"PRIu32" to the interface's maximum MTU %"PRIu32".",
736 mtu, link->max_mtu);
737 mtu = link->max_mtu;
0fa8ee6c
YW		 738 }
739
740 if (link->mtu == mtu)
741 return 0;
742
743 r = link_request_set_link(link, SET_LINK_MTU, link_set_mtu_handler, &req);
744 if (r < 0)
745 return r;
746
747 req->userdata = UINT32_TO_PTR(mtu);
748 return 0;
749}
750
751static bool link_reduces_vlan_mtu(Link *link) {
752 /* See netif_reduces_vlan_mtu() in kernel. */
753 return streq_ptr(link->kind, "macsec");
754}
755
756static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
757 uint32_t mtu = 0;
758 NetDev *dev;
759
760 HASHMAP_FOREACH(dev, link->network->stacked_netdevs)
761 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
762 /* See vlan_dev_change_mtu() in kernel. */
763 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
764
765 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
766 /* See macvlan_change_mtu() in kernel. */
767 mtu = dev->mtu;
768
769 return mtu;
770}
771
772int link_configure_mtu(Link *link) {
773 uint32_t mtu;
774
775 assert(link);
776 assert(link->network);
777
778 if (link->network->mtu > 0)
779 return link_request_to_set_mtu(link, link->network->mtu);
780
781 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
782 if (link->mtu >= mtu)
783 return 0;
784
785 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
786 "If it is not desired, then please explicitly specify MTUBytes= setting.",
787 link->mtu, mtu);
788
789 return link_request_to_set_mtu(link, mtu);
790}
112a0972
YW		 791
792static int link_up_or_down_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool up, bool check_ready) {
793 int r;
794
795 assert(m);
796 assert(link);
797
798 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
baa95d22 799 goto on_error;
112a0972
YW		 800
801 r = sd_netlink_message_get_errno(m);
802 if (r < 0)
803 log_link_message_warning_errno(link, m, r, up ?
804 "Could not bring up interface, ignoring" :
805 "Could not bring down interface, ignoring");
806
baa95d22
YW		 807 r = link_call_getlink(link, get_link_update_flag_handler);
808 if (r < 0) {
809 link_enter_failed(link);
810 goto on_error;
811 }
812
112a0972
YW		 813 if (check_ready) {
814 link->activated = true;
815 link_check_ready(link);
816 }
817
baa95d22
YW		 818 return 1;
819
820on_error:
821 assert(link->set_flags_messages > 0);
822 link->set_flags_messages--;
823
112a0972
YW		 824 return 0;
825}
826
827static int link_activate_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
828 return link_up_or_down_handler_internal(rtnl, m, link, true, true);
829}
830
831static int link_activate_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
832 return link_up_or_down_handler_internal(rtnl, m, link, false, true);
833}
834
835static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
836 return link_up_or_down_handler_internal(rtnl, m, link, true, false);
837}
838
839static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
840 return link_up_or_down_handler_internal(rtnl, m, link, false, false);
841}
842
68f52063
YW		 843static const char *up_or_down(bool up) {
844 return up ? "up" : "down";
845}
846
112a0972
YW		 847static int link_up_or_down(Link *link, bool up, link_netlink_message_handler_t callback) {
848 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
849 int r;
850
851 assert(link);
852 assert(link->manager);
853 assert(link->manager->rtnl);
854 assert(callback);
855
68f52063 856 log_link_debug(link, "Bringing link %s", up_or_down(up));
112a0972
YW		 857
858 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
859 if (r < 0)
860 return log_link_debug_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
861
862 r = sd_rtnl_message_link_set_flags(req, up ? IFF_UP : 0, IFF_UP);
863 if (r < 0)
864 return log_link_debug_errno(link, r, "Could not set link flags: %m");
865
866 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
867 link_netlink_destroy_callback, link);
868 if (r < 0)
869 return log_link_debug_errno(link, r, "Could not send rtnetlink message: %m");
870
871 link_ref(link);
872
873 return 0;
874}
875
112a0972
YW		 876int link_down(Link *link) {
877 return link_up_or_down(link, false, link_down_handler);
878}
879
880static bool link_is_ready_to_activate(Link *link) {
881 assert(link);
882
883 if (!IN_SET(link->state, LINK_STATE_INITIALIZED, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
884 return false;
885
886 if (link->set_link_messages > 0)
887 return false;
888
889 return true;
890}
891
892int request_process_activation(Request *req) {
893 Link *link;
894 bool up;
895 int r;
896
897 assert(req);
898 assert(req->link);
899 assert(req->type == REQUEST_TYPE_ACTIVATE_LINK);
900 assert(req->netlink_handler);
901
902 link = req->link;
903 up = PTR_TO_INT(req->userdata);
904
905 if (!link_is_ready_to_activate(link))
906 return 0;
907
908 r = link_up_or_down(link, up, req->netlink_handler);
909 if (r < 0)
68f52063 910 return log_link_error_errno(link, r, "Failed to bring %s: %m", up_or_down(up));
112a0972
YW		 911
912 return 1;
913}
914
915int link_request_to_activate(Link *link) {
916 Request *req;
917 bool up;
918 int r;
919
920 assert(link);
921 assert(link->network);
922
923 switch (link->network->activation_policy) {
924 case ACTIVATION_POLICY_BOUND:
112a0972
YW		 925 r = link_handle_bound_to_list(link);
926 if (r < 0)
927 return r;
928 _fallthrough_;
929 case ACTIVATION_POLICY_MANUAL:
930 link->activated = true;
931 link_check_ready(link);
932 return 0;
933 case ACTIVATION_POLICY_UP:
934 case ACTIVATION_POLICY_ALWAYS_UP:
935 up = true;
936 break;
937 case ACTIVATION_POLICY_DOWN:
938 case ACTIVATION_POLICY_ALWAYS_DOWN:
939 up = false;
940 break;
941 default:
942 assert_not_reached("invalid activation policy");
943 }
944
945 link->activated = false;
946
baa95d22 947 r = link_queue_request(link, REQUEST_TYPE_ACTIVATE_LINK, NULL, false, &link->set_flags_messages,
112a0972
YW		 948 up ? link_activate_up_handler : link_activate_down_handler, &req);
949 if (r < 0)
950 return log_link_error_errno(link, r, "Failed to request to activate link: %m");
951
952 req->userdata = INT_TO_PTR(up);
953
954 log_link_debug(link, "Requested to activate link");
955 return 0;
956}
68f52063
YW		 957
958static bool link_is_ready_to_bring_up_or_down(Link *link) {
959 assert(link);
960
961 if (link->state == LINK_STATE_UNMANAGED)
962 return true;
963
964 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
965 return false;
966
967 if (link->set_link_messages > 0)
968 return false;
969
970 if (!link->activated)
971 return false;
972
973 return true;
974}
975
976int request_process_link_up_or_down(Request *req) {
977 Link *link;
978 bool up;
979 int r;
980
981 assert(req);
982 assert(req->link);
983 assert(req->type == REQUEST_TYPE_UP_DOWN);
984
985 link = req->link;
986 up = PTR_TO_INT(req->userdata);
987
988 if (!link_is_ready_to_bring_up_or_down(link))
989 return 0;
990
991 r = link_up_or_down(link, up, req->netlink_handler);
992 if (r < 0)
993 return log_link_error_errno(link, r, "Failed to bring %s: %m", up_or_down(up));
994
995 return 1;
996}
997
998int link_request_to_bring_up_or_down(Link *link, bool up) {
999 Request *req;
1000 int r;
1001
1002 assert(link);
1003
baa95d22 1004 r = link_queue_request(link, REQUEST_TYPE_UP_DOWN, NULL, false, &link->set_flags_messages,
68f52063
YW		 1005 up ? link_up_handler : link_down_handler, &req);
1006 if (r < 0)
1007 return log_link_error_errno(link, r, "Failed to request to bring %s link: %m",
1008 up_or_down(up));
1009
1010 req->userdata = INT_TO_PTR(up);
1011
1012 log_link_debug(link, "Requested to bring link %s", up_or_down(up));
1013 return 0;
1014}
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