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[thirdparty/systemd.git] / src / network / networkd-setlink.c
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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
d05c332c
YW		 150static int link_set_mac_allow_retry_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
151 int r;
152
153 assert(m);
154 assert(link);
155 assert(link->set_link_messages > 0);
156
157 link->set_link_messages--;
158
159 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
160 return 0;
161
162 r = sd_netlink_message_get_errno(m);
163 if (r == -EBUSY) {
164 /* Most real network devices refuse to set its hardware address with -EBUSY when its
165 * operstate is not down. See, eth_prepare_mac_addr_change() in net/ethernet/eth.c
166 * of kernel. */
167
168 log_link_message_debug_errno(link, m, r, "Failed to set MAC address, retrying again: %m");
169
170 r = link_request_to_set_mac(link, /* allow_retry = */ false);
171 if (r < 0)
172 link_enter_failed(link);
173
174 return 0;
175 }
176
177 /* set_link_mac_handler() also decrement set_link_messages, so once increment the value. */
178 link->set_link_messages++;
179 return link_set_mac_handler(rtnl, m, link);
180}
181
d24bf1b5 182static int link_set_master_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2a057a73 183 return set_link_handler_internal(rtnl, m, link, SET_LINK_MASTER, false, get_link_master_handler);
d24bf1b5
YW		 184}
185
0fa8ee6c
YW		 186static int link_set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
187 int r;
188
1362bd6c 189 r = set_link_handler_internal(rtnl, m, link, SET_LINK_MTU, true, get_link_default_handler);
0fa8ee6c
YW		 190 if (r <= 0)
191 return r;
192
193 /* The kernel resets ipv6 mtu after changing device mtu;
194 * we must set this here, after we've set device mtu */
195 r = link_set_ipv6_mtu(link);
196 if (r < 0)
197 log_link_warning_errno(link, r, "Failed to set IPv6 MTU, ignoring: %m");
198
0fa8ee6c
YW		 199 return 0;
200}
201
202static int link_configure(
203 Link *link,
204 SetLinkOperation op,
205 void *userdata,
206 link_netlink_message_handler_t callback) {
207
208 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
209 int r;
210
211 assert(link);
212 assert(link->manager);
213 assert(link->manager->rtnl);
214 assert(link->network);
215 assert(op >= 0 && op < _SET_LINK_OPERATION_MAX);
216 assert(callback);
217
218 log_link_debug(link, "Setting %s", set_link_operation_to_string(op));
219
7558f9e7 220 if (IN_SET(op, SET_LINK_BOND, SET_LINK_CAN)) {
5062b859
YW		 221 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->master_ifindex);
222 if (r < 0)
223 return log_link_debug_errno(link, r, "Could not allocate RTM_NEWLINK message: %m");
224 } else {
225 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
226 if (r < 0)
227 return log_link_debug_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
228 }
0fa8ee6c
YW		 229
230 switch (op) {
8e00e24c
YW		 231 case SET_LINK_ADDRESS_GENERATION_MODE:
232 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
233 if (r < 0)
234 return log_link_debug_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
235
236 r = sd_netlink_message_open_container(req, AF_INET6);
237 if (r < 0)
238 return log_link_debug_errno(link, r, "Could not open AF_INET6 container: %m");
239
240 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, PTR_TO_UINT8(userdata));
241 if (r < 0)
242 return log_link_debug_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE attribute: %m");
243
244 r = sd_netlink_message_close_container(req);
245 if (r < 0)
246 return log_link_debug_errno(link, r, "Could not close AF_INET6 container: %m");
247
248 r = sd_netlink_message_close_container(req);
249 if (r < 0)
250 return log_link_debug_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
251 break;
5062b859
YW		 252 case SET_LINK_BOND:
253 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
254 if (r < 0)
255 return log_link_debug_errno(link, r, "Could not set netlink message flags: %m");
256
257 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
258 if (r < 0)
259 return log_link_debug_errno(link, r, "Could not open IFLA_LINKINFO container: %m");
260
261 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
262 if (r < 0)
263 return log_link_debug_errno(link, r, "Could not open IFLA_INFO_DATA container: %m");
264
265 if (link->network->active_slave) {
266 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
267 if (r < 0)
268 return log_link_debug_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
269 }
270
271 if (link->network->primary_slave) {
272 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
273 if (r < 0)
274 return log_link_debug_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
275 }
276
277 r = sd_netlink_message_close_container(req);
278 if (r < 0)
279 return log_link_debug_errno(link, r, "Could not close IFLA_INFO_DATA container: %m");
280
281 r = sd_netlink_message_close_container(req);
282 if (r < 0)
283 return log_link_debug_errno(link, r, "Could not close IFLA_LINKINFO container: %m");
284
285 break;
7d5b232f
YW		 286 case SET_LINK_BRIDGE:
287 r = sd_rtnl_message_link_set_family(req, AF_BRIDGE);
288 if (r < 0)
289 return log_link_debug_errno(link, r, "Could not set message family: %m");
290
291 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
292 if (r < 0)
293 return log_link_debug_errno(link, r, "Could not open IFLA_PROTINFO container: %m");
294
295 if (link->network->use_bpdu >= 0) {
296 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
297 if (r < 0)
298 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
299 }
300
301 if (link->network->hairpin >= 0) {
302 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
303 if (r < 0)
304 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
305 }
306
307 if (link->network->fast_leave >= 0) {
308 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
309 if (r < 0)
310 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
311 }
312
313 if (link->network->allow_port_to_be_root >= 0) {
314 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
315 if (r < 0)
316 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
317 }
318
319 if (link->network->unicast_flood >= 0) {
320 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
321 if (r < 0)
322 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
323 }
324
325 if (link->network->multicast_flood >= 0) {
326 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_FLOOD, link->network->multicast_flood);
327 if (r < 0)
328 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_MCAST_FLOOD attribute: %m");
329 }
330
331 if (link->network->multicast_to_unicast >= 0) {
332 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
333 if (r < 0)
334 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
335 }
336
337 if (link->network->neighbor_suppression >= 0) {
338 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_NEIGH_SUPPRESS, link->network->neighbor_suppression);
339 if (r < 0)
340 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_NEIGH_SUPPRESS attribute: %m");
341 }
342
343 if (link->network->learning >= 0) {
344 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning);
345 if (r < 0)
346 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_LEARNING attribute: %m");
347 }
348
349 if (link->network->bridge_proxy_arp >= 0) {
350 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROXYARP, link->network->bridge_proxy_arp);
351 if (r < 0)
352 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_PROXYARP attribute: %m");
353 }
354
355 if (link->network->bridge_proxy_arp_wifi >= 0) {
356 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROXYARP_WIFI, link->network->bridge_proxy_arp_wifi);
357 if (r < 0)
358 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_PROXYARP_WIFI attribute: %m");
359 }
360
361 if (link->network->cost != 0) {
362 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
363 if (r < 0)
364 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
365 }
366
367 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
368 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
369 if (r < 0)
370 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
371 }
372
373 if (link->network->multicast_router != _MULTICAST_ROUTER_INVALID) {
374 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MULTICAST_ROUTER, link->network->multicast_router);
375 if (r < 0)
376 return log_link_debug_errno(link, r, "Could not append IFLA_BRPORT_MULTICAST_ROUTER attribute: %m");
377 }
378
379 r = sd_netlink_message_close_container(req);
380 if (r < 0)
381 return log_link_debug_errno(link, r, "Could not close IFLA_PROTINFO container: %m");
382 break;
8252fb44
YW		 383 case SET_LINK_BRIDGE_VLAN:
384 r = sd_rtnl_message_link_set_family(req, AF_BRIDGE);
385 if (r < 0)
386 return log_link_debug_errno(link, r, "Could not set message family: %m");
387
388 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
389 if (r < 0)
390 return log_link_debug_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
391
392 if (!link->network->bridge) {
7802194a 393 /* master needs BRIDGE_FLAGS_SELF flag */
8252fb44
YW		 394 r = sd_netlink_message_append_u16(req, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF);
395 if (r < 0)
396 return log_link_debug_errno(link, r, "Could not append IFLA_BRIDGE_FLAGS attribute: %m");
397 }
398
399 r = bridge_vlan_append_info(link, req, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
400 if (r < 0)
401 return log_link_debug_errno(link, r, "Could not append VLANs: %m");
402
403 r = sd_netlink_message_close_container(req);
404 if (r < 0)
405 return log_link_debug_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
406
407 break;
7558f9e7
YW		 408 case SET_LINK_CAN:
409 r = can_set_netlink_message(link, req);
410 if (r < 0)
411 return r;
412 break;
93fabc10
YW		 413 case SET_LINK_FLAGS: {
414 unsigned ifi_change = 0, ifi_flags = 0;
415
416 if (link->network->arp >= 0) {
417 ifi_change |= IFF_NOARP;
418 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
419 }
420
421 if (link->network->multicast >= 0) {
422 ifi_change |= IFF_MULTICAST;
423 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
424 }
425
426 if (link->network->allmulticast >= 0) {
427 ifi_change |= IFF_ALLMULTI;
428 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
429 }
430
431 if (link->network->promiscuous >= 0) {
432 ifi_change |= IFF_PROMISC;
433 SET_FLAG(ifi_flags, IFF_PROMISC, link->network->promiscuous);
434 }
435
436 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
437 if (r < 0)
438 return log_link_debug_errno(link, r, "Could not set link flags: %m");
439
440 break;
441 }
cc4c8fb1
YW		 442 case SET_LINK_GROUP:
443 r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
444 if (r < 0)
445 return log_link_debug_errno(link, r, "Could not append IFLA_GROUP attribute: %m");
446 break;
a8e5e27c
YW		 447 case SET_LINK_MAC:
448 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
449 if (r < 0)
450 return log_link_debug_errno(link, r, "Could not append IFLA_ADDRESS attribute: %m");
451 break;
d24bf1b5
YW		 452 case SET_LINK_MASTER:
453 r = sd_netlink_message_append_u32(req, IFLA_MASTER, PTR_TO_UINT32(userdata));
454 if (r < 0)
455 return log_link_debug_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
456 break;
0fa8ee6c
YW		 457 case SET_LINK_MTU:
458 r = sd_netlink_message_append_u32(req, IFLA_MTU, PTR_TO_UINT32(userdata));
459 if (r < 0)
460 return log_link_debug_errno(link, r, "Could not append IFLA_MTU attribute: %m");
461 break;
462 default:
463 assert_not_reached("Invalid set link operation");
464 }
465
466 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
467 link_netlink_destroy_callback, link);
468 if (r < 0)
469 return log_link_debug_errno(link, r, "Could not send RTM_SETLINK message: %m");
470
471 link_ref(link);
472 return 0;
473}
474
d24bf1b5
YW		 475static bool netdev_is_ready(NetDev *netdev) {
476 assert(netdev);
477
478 if (netdev->state != NETDEV_STATE_READY)
479 return false;
480 if (netdev->ifindex == 0)
481 return false;
482
483 return true;
484}
485
0fa8ee6c 486static bool link_is_ready_to_call_set_link(Request *req) {
d24bf1b5 487 SetLinkOperation op;
0fa8ee6c 488 Link *link;
d24bf1b5 489 int r;
0fa8ee6c
YW		 490
491 assert(req);
492
493 link = req->link;
d24bf1b5 494 op = req->set_link_operation;
0fa8ee6c
YW		 495
496 if (!IN_SET(link->state, LINK_STATE_INITIALIZED, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
497 return false;
498
d24bf1b5 499 switch (op) {
440d40dc
YW		 500 case SET_LINK_BOND:
501 case SET_LINK_BRIDGE:
502 case SET_LINK_BRIDGE_VLAN:
503 if (!link->master_set)
504 return false;
505 break;
7558f9e7 506 case SET_LINK_CAN:
baa95d22
YW		 507 /* Do not check link->set_flgas_messages here, as it is ok even if link->flags
508 * is outdated, and checking the counter causes a deadlock. */
7558f9e7
YW		 509 if (FLAGS_SET(link->flags, IFF_UP)) {
510 /* The CAN interface must be down to configure bitrate, etc... */
511 r = link_down(link);
512 if (r < 0) {
513 link_enter_failed(link);
514 return false;
515 }
516 }
517 break;
d05c332c
YW		 518 case SET_LINK_MAC:
519 if (req->netlink_handler == link_set_mac_handler) {
520 /* This is the second trial to set MTU. On the first attempt
521 * req->netlink_handler points to link_set_mac_allow_retry_handler().
522 * The first trial failed as the interface was up. */
523 r = link_down(link);
524 if (r < 0) {
525 link_enter_failed(link);
526 return false;
527 }
528 }
529 break;
d24bf1b5
YW		 530 case SET_LINK_MASTER: {
531 uint32_t m = 0;
532
533 assert(link->network);
534
535 if (link->network->batadv) {
536 if (!netdev_is_ready(link->network->batadv))
537 return false;
538 m = link->network->batadv->ifindex;
539 } else if (link->network->bond) {
540 if (!netdev_is_ready(link->network->bond))
541 return false;
542 m = link->network->bond->ifindex;
543
baa95d22
YW		 544 /* Do not check link->set_flgas_messages here, as it is ok even if link->flags
545 * is outdated, and checking the counter causes a deadlock. */
d24bf1b5
YW		 546 if (FLAGS_SET(link->flags, IFF_UP)) {
547 /* link must be down when joining to bond master. */
112a0972 548 r = link_down(link);
d24bf1b5
YW		 549 if (r < 0) {
550 link_enter_failed(link);
551 return false;
552 }
553 }
554 } else if (link->network->bridge) {
555 if (!netdev_is_ready(link->network->bridge))
556 return false;
557 m = link->network->bridge->ifindex;
558 } else if (link->network->vrf) {
559 if (!netdev_is_ready(link->network->vrf))
560 return false;
561 m = link->network->vrf->ifindex;
562 }
563
564 req->userdata = UINT32_TO_PTR(m);
565 break;
566 }
567 default:
568 break;
569 }
570
0fa8ee6c
YW		 571 return true;
572}
573
574int request_process_set_link(Request *req) {
575 int r;
576
577 assert(req);
578 assert(req->link);
579 assert(req->type == REQUEST_TYPE_SET_LINK);
580 assert(req->set_link_operation >= 0 && req->set_link_operation < _SET_LINK_OPERATION_MAX);
581 assert(req->netlink_handler);
582
583 if (!link_is_ready_to_call_set_link(req))
584 return 0;
585
586 r = link_configure(req->link, req->set_link_operation, req->userdata, req->netlink_handler);
587 if (r < 0)
588 return log_link_error_errno(req->link, r, "Failed to set %s: %m",
589 set_link_operation_to_string(req->set_link_operation));
590
baa95d22
YW		 591 if (req->set_link_operation == SET_LINK_FLAGS)
592 req->link->set_flags_messages++;
593
0fa8ee6c
YW		 594 return 1;
595}
596
597static int link_request_set_link(
598 Link *link,
599 SetLinkOperation op,
600 link_netlink_message_handler_t netlink_handler,
601 Request **ret) {
602
603 Request *req;
604 int r;
605
606 assert(link);
607 assert(op >= 0 && op < _SET_LINK_OPERATION_MAX);
608 assert(netlink_handler);
609
610 r = link_queue_request(link, REQUEST_TYPE_SET_LINK, INT_TO_PTR(op), false,
611 &link->set_link_messages, netlink_handler, &req);
612 if (r < 0)
613 return log_link_error_errno(link, r, "Failed to request to set %s: %m",
614 set_link_operation_to_string(op));
615
616 log_link_debug(link, "Requested to set %s", set_link_operation_to_string(op));
617
618 if (ret)
619 *ret = req;
620 return 0;
621}
622
8e00e24c
YW		 623int link_request_to_set_addrgen_mode(Link *link) {
624 Request *req;
625 uint8_t mode;
626 int r;
627
628 assert(link);
629 assert(link->network);
630
631 if (!socket_ipv6_is_supported())
632 return 0;
633
634 if (!link_ipv6ll_enabled(link))
635 mode = IN6_ADDR_GEN_MODE_NONE;
636 else if (link->network->ipv6ll_address_gen_mode >= 0)
637 mode = link->network->ipv6ll_address_gen_mode;
9e1432d5
YW		 638 else if (in6_addr_is_set(&link->network->ipv6ll_stable_secret))
639 mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
640 else
641 mode = IN6_ADDR_GEN_MODE_EUI64;
8e00e24c
YW		 642
643 r = link_request_set_link(link, SET_LINK_ADDRESS_GENERATION_MODE, link_set_addrgen_mode_handler, &req);
644 if (r < 0)
645 return r;
646
647 req->userdata = UINT8_TO_PTR(mode);
648 return 0;
649}
650
5062b859
YW		 651int link_request_to_set_bond(Link *link) {
652 assert(link);
653 assert(link->network);
654
655 if (!link->network->bond)
656 return 0;
657
658 return link_request_set_link(link, SET_LINK_BOND, link_set_bond_handler, NULL);
659}
660
7d5b232f
YW		 661int link_request_to_set_bridge(Link *link) {
662 assert(link);
663 assert(link->network);
664
665 if (!link->network->bridge)
666 return 0;
667
668 return link_request_set_link(link, SET_LINK_BRIDGE, link_set_bridge_handler, NULL);
669}
670
8252fb44
YW		 671int link_request_to_set_bridge_vlan(Link *link) {
672 assert(link);
673 assert(link->network);
674
675 if (!link->network->use_br_vlan)
676 return 0;
677
678 if (!link->network->bridge && !streq_ptr(link->kind, "bridge"))
679 return 0;
680
681 return link_request_set_link(link, SET_LINK_BRIDGE_VLAN, link_set_bridge_vlan_handler, NULL);
682}
683
7558f9e7
YW		 684int link_request_to_set_can(Link *link) {
685 assert(link);
686 assert(link->network);
687
688 if (link->iftype != ARPHRD_CAN)
689 return 0;
690
691 if (!streq_ptr(link->kind, "can"))
692 return 0;
693
694 return link_request_set_link(link, SET_LINK_CAN, link_set_can_handler, NULL);
695}
696
93fabc10
YW		 697int link_request_to_set_flags(Link *link) {
698 assert(link);
699 assert(link->network);
700
701 if (link->network->arp < 0 &&
702 link->network->multicast < 0 &&
703 link->network->allmulticast < 0 &&
704 link->network->promiscuous < 0)
705 return 0;
706
707 return link_request_set_link(link, SET_LINK_FLAGS, link_set_flags_handler, NULL);
708}
709
cc4c8fb1
YW		 710int link_request_to_set_group(Link *link) {
711 assert(link);
712 assert(link->network);
713
714 if (!link->network->group_set)
715 return 0;
716
717 return link_request_set_link(link, SET_LINK_GROUP, link_set_group_handler, NULL);
718}
719
d05c332c 720int link_request_to_set_mac(Link *link, bool allow_retry) {
a8e5e27c
YW		 721 assert(link);
722 assert(link->network);
723
724 if (!link->network->mac)
725 return 0;
726
5388e103
YW		 727 if (link->hw_addr.length != sizeof(struct ether_addr)) {
728 /* Note that for now we only support changing hardware addresses on Ethernet. */
729 log_link_debug(link, "Size of the hardware address (%zu) does not match the size of MAC address (%zu), ignoring.",
730 link->hw_addr.length, sizeof(struct ether_addr));
731 return 0;
732 }
733
734 if (ether_addr_equal(&link->hw_addr.ether, link->network->mac))
735 return 0;
736
d05c332c
YW		 737 return link_request_set_link(link, SET_LINK_MAC,
738 allow_retry ? link_set_mac_allow_retry_handler : link_set_mac_handler,
739 NULL);
a8e5e27c
YW		 740}
741
d24bf1b5
YW		 742int link_request_to_set_master(Link *link) {
743 assert(link);
744
440d40dc
YW		 745 link->master_set = false;
746
d24bf1b5
YW		 747 return link_request_set_link(link, SET_LINK_MASTER, link_set_master_handler, NULL);
748}
749
0fa8ee6c 750int link_request_to_set_mtu(Link *link, uint32_t mtu) {
59ca71a9 751 Request *req;
717ba5fc
YW		 752 const char *origin;
753 uint32_t min_mtu;
0fa8ee6c
YW		 754 int r;
755
756 assert(link);
717ba5fc
YW		 757 assert(link->network);
758
759 min_mtu = link->min_mtu;
760 origin = "the minimum MTU of the interface";
761 if (link_ipv6_enabled(link)) {
762 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes on the interface. Bump up
763 * MTU bytes to IPV6_MTU_MIN. */
764 if (min_mtu < IPV6_MIN_MTU) {
765 min_mtu = IPV6_MIN_MTU;
766 origin = "the minimum IPv6 MTU";
767 }
768 if (min_mtu < link->network->ipv6_mtu) {
769 min_mtu = link->network->ipv6_mtu;
770 origin = "the requested IPv6 MTU in IPv6MTUBytes=";
771 }
772 }
773
774 if (mtu < min_mtu) {
775 log_link_warning(link, "Bumping the requested MTU %"PRIu32" to %s (%"PRIu32")",
776 mtu, origin, min_mtu);
777 mtu = min_mtu;
778 }
0fa8ee6c 779
717ba5fc
YW		 780 if (mtu > link->max_mtu) {
781 log_link_warning(link, "Reducing the requested MTU %"PRIu32" to the interface's maximum MTU %"PRIu32".",
782 mtu, link->max_mtu);
783 mtu = link->max_mtu;
0fa8ee6c
YW		 784 }
785
786 if (link->mtu == mtu)
787 return 0;
788
789 r = link_request_set_link(link, SET_LINK_MTU, link_set_mtu_handler, &req);
790 if (r < 0)
791 return r;
792
793 req->userdata = UINT32_TO_PTR(mtu);
794 return 0;
795}
796
797static bool link_reduces_vlan_mtu(Link *link) {
798 /* See netif_reduces_vlan_mtu() in kernel. */
799 return streq_ptr(link->kind, "macsec");
800}
801
802static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
803 uint32_t mtu = 0;
804 NetDev *dev;
805
806 HASHMAP_FOREACH(dev, link->network->stacked_netdevs)
807 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
808 /* See vlan_dev_change_mtu() in kernel. */
809 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
810
811 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
812 /* See macvlan_change_mtu() in kernel. */
813 mtu = dev->mtu;
814
815 return mtu;
816}
817
818int link_configure_mtu(Link *link) {
819 uint32_t mtu;
820
821 assert(link);
822 assert(link->network);
823
824 if (link->network->mtu > 0)
825 return link_request_to_set_mtu(link, link->network->mtu);
826
827 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
828 if (link->mtu >= mtu)
829 return 0;
830
831 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
832 "If it is not desired, then please explicitly specify MTUBytes= setting.",
833 link->mtu, mtu);
834
835 return link_request_to_set_mtu(link, mtu);
836}
112a0972
YW		 837
838static int link_up_or_down_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool up, bool check_ready) {
839 int r;
840
841 assert(m);
842 assert(link);
843
844 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
baa95d22 845 goto on_error;
112a0972
YW		 846
847 r = sd_netlink_message_get_errno(m);
848 if (r < 0)
849 log_link_message_warning_errno(link, m, r, up ?
850 "Could not bring up interface, ignoring" :
851 "Could not bring down interface, ignoring");
852
baa95d22
YW		 853 r = link_call_getlink(link, get_link_update_flag_handler);
854 if (r < 0) {
855 link_enter_failed(link);
856 goto on_error;
857 }
858
112a0972
YW		 859 if (check_ready) {
860 link->activated = true;
861 link_check_ready(link);
862 }
863
baa95d22
YW		 864 return 1;
865
866on_error:
867 assert(link->set_flags_messages > 0);
868 link->set_flags_messages--;
869
112a0972
YW		 870 return 0;
871}
872
873static int link_activate_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
874 return link_up_or_down_handler_internal(rtnl, m, link, true, true);
875}
876
877static int link_activate_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
878 return link_up_or_down_handler_internal(rtnl, m, link, false, true);
879}
880
881static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
882 return link_up_or_down_handler_internal(rtnl, m, link, true, false);
883}
884
885static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
886 return link_up_or_down_handler_internal(rtnl, m, link, false, false);
887}
888
68f52063
YW		 889static const char *up_or_down(bool up) {
890 return up ? "up" : "down";
891}
892
112a0972
YW		 893static int link_up_or_down(Link *link, bool up, link_netlink_message_handler_t callback) {
894 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
895 int r;
896
897 assert(link);
898 assert(link->manager);
899 assert(link->manager->rtnl);
900 assert(callback);
901
68f52063 902 log_link_debug(link, "Bringing link %s", up_or_down(up));
112a0972
YW		 903
904 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
905 if (r < 0)
906 return log_link_debug_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
907
908 r = sd_rtnl_message_link_set_flags(req, up ? IFF_UP : 0, IFF_UP);
909 if (r < 0)
910 return log_link_debug_errno(link, r, "Could not set link flags: %m");
911
912 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
913 link_netlink_destroy_callback, link);
914 if (r < 0)
915 return log_link_debug_errno(link, r, "Could not send rtnetlink message: %m");
916
917 link_ref(link);
918
919 return 0;
920}
921
112a0972 922int link_down(Link *link) {
7149bde4
YW		 923 int r;
924
925 assert(link);
926
927 r = link_up_or_down(link, false, link_down_handler);
928 if (r < 0)
929 return log_link_error_errno(link, r, "Failed to bring down interface: %m");
930
931 link->set_flags_messages++;
932 return 0;
112a0972
YW		 933}
934
935static bool link_is_ready_to_activate(Link *link) {
936 assert(link);
937
938 if (!IN_SET(link->state, LINK_STATE_INITIALIZED, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
939 return false;
940
941 if (link->set_link_messages > 0)
942 return false;
943
944 return true;
945}
946
947int request_process_activation(Request *req) {
948 Link *link;
949 bool up;
950 int r;
951
952 assert(req);
953 assert(req->link);
954 assert(req->type == REQUEST_TYPE_ACTIVATE_LINK);
955 assert(req->netlink_handler);
956
957 link = req->link;
958 up = PTR_TO_INT(req->userdata);
959
960 if (!link_is_ready_to_activate(link))
961 return 0;
962
963 r = link_up_or_down(link, up, req->netlink_handler);
964 if (r < 0)
68f52063 965 return log_link_error_errno(link, r, "Failed to bring %s: %m", up_or_down(up));
112a0972
YW		 966
967 return 1;
968}
969
970int link_request_to_activate(Link *link) {
971 Request *req;
972 bool up;
973 int r;
974
975 assert(link);
976 assert(link->network);
977
978 switch (link->network->activation_policy) {
979 case ACTIVATION_POLICY_BOUND:
112a0972
YW		 980 r = link_handle_bound_to_list(link);
981 if (r < 0)
982 return r;
983 _fallthrough_;
984 case ACTIVATION_POLICY_MANUAL:
985 link->activated = true;
986 link_check_ready(link);
987 return 0;
988 case ACTIVATION_POLICY_UP:
989 case ACTIVATION_POLICY_ALWAYS_UP:
990 up = true;
991 break;
992 case ACTIVATION_POLICY_DOWN:
993 case ACTIVATION_POLICY_ALWAYS_DOWN:
994 up = false;
995 break;
996 default:
997 assert_not_reached("invalid activation policy");
998 }
999
1000 link->activated = false;
1001
baa95d22 1002 r = link_queue_request(link, REQUEST_TYPE_ACTIVATE_LINK, NULL, false, &link->set_flags_messages,
112a0972
YW		 1003 up ? link_activate_up_handler : link_activate_down_handler, &req);
1004 if (r < 0)
1005 return log_link_error_errno(link, r, "Failed to request to activate link: %m");
1006
1007 req->userdata = INT_TO_PTR(up);
1008
1009 log_link_debug(link, "Requested to activate link");
1010 return 0;
1011}
68f52063
YW		 1012
1013static bool link_is_ready_to_bring_up_or_down(Link *link) {
1014 assert(link);
1015
1016 if (link->state == LINK_STATE_UNMANAGED)
1017 return true;
1018
1019 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
1020 return false;
1021
1022 if (link->set_link_messages > 0)
1023 return false;
1024
1025 if (!link->activated)
1026 return false;
1027
1028 return true;
1029}
1030
1031int request_process_link_up_or_down(Request *req) {
1032 Link *link;
1033 bool up;
1034 int r;
1035
1036 assert(req);
1037 assert(req->link);
1038 assert(req->type == REQUEST_TYPE_UP_DOWN);
1039
1040 link = req->link;
1041 up = PTR_TO_INT(req->userdata);
1042
1043 if (!link_is_ready_to_bring_up_or_down(link))
1044 return 0;
1045
1046 r = link_up_or_down(link, up, req->netlink_handler);
1047 if (r < 0)
1048 return log_link_error_errno(link, r, "Failed to bring %s: %m", up_or_down(up));
1049
1050 return 1;
1051}
1052
1053int link_request_to_bring_up_or_down(Link *link, bool up) {
1054 Request *req;
1055 int r;
1056
1057 assert(link);
1058
baa95d22 1059 r = link_queue_request(link, REQUEST_TYPE_UP_DOWN, NULL, false, &link->set_flags_messages,
68f52063
YW		 1060 up ? link_up_handler : link_down_handler, &req);
1061 if (r < 0)
1062 return log_link_error_errno(link, r, "Failed to request to bring %s link: %m",
1063 up_or_down(up));
1064
1065 req->userdata = INT_TO_PTR(up);
1066
1067 log_link_debug(link, "Requested to bring link %s", up_or_down(up));
1068 return 0;
1069}
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