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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
139b011a PF |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
7bd8e95d | 5 | Copyright (C) 2014-2015 Intel Corporation. All rights reserved. |
139b011a PF |
6 | |
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <errno.h> | |
22 | #include <string.h> | |
631bbe71 | 23 | #include <sys/ioctl.h> |
76253e73 | 24 | #include <linux/if_infiniband.h> |
139b011a | 25 | |
139b011a | 26 | #include "sd-dhcp6-client.h" |
07630cea | 27 | |
b5efdb8a | 28 | #include "alloc-util.h" |
07630cea | 29 | #include "dhcp-identifier.h" |
f12abb48 | 30 | #include "dhcp6-internal.h" |
631bbe71 | 31 | #include "dhcp6-lease-internal.h" |
07630cea | 32 | #include "dhcp6-protocol.h" |
8006aa32 | 33 | #include "dns-domain.h" |
3ffd4af2 | 34 | #include "fd-util.h" |
8006aa32 | 35 | #include "hostname-util.h" |
c601ebf7 | 36 | #include "in-addr-util.h" |
07630cea LP |
37 | #include "network-internal.h" |
38 | #include "random-util.h" | |
4edc2c9b | 39 | #include "socket-util.h" |
8b43440b | 40 | #include "string-table.h" |
07630cea | 41 | #include "util.h" |
139b011a | 42 | |
76253e73 DW |
43 | #define MAX_MAC_ADDR_LEN INFINIBAND_ALEN |
44 | ||
139b011a | 45 | struct sd_dhcp6_client { |
3733eec3 | 46 | unsigned n_ref; |
139b011a PF |
47 | |
48 | enum DHCP6State state; | |
49 | sd_event *event; | |
50 | int event_priority; | |
2f8e7633 | 51 | int ifindex; |
c601ebf7 | 52 | struct in6_addr local_address; |
76253e73 DW |
53 | uint8_t mac_addr[MAX_MAC_ADDR_LEN]; |
54 | size_t mac_addr_len; | |
55 | uint16_t arp_type; | |
f12abb48 | 56 | DHCP6IA ia_na; |
a9aff361 | 57 | be32_t transaction_id; |
346e13a2 | 58 | usec_t transaction_start; |
631bbe71 | 59 | struct sd_dhcp6_lease *lease; |
a9aff361 | 60 | int fd; |
bbfa43ca | 61 | bool information_request; |
da6fe470 PF |
62 | be16_t *req_opts; |
63 | size_t req_opts_allocated; | |
64 | size_t req_opts_len; | |
8006aa32 | 65 | char *fqdn; |
a9aff361 | 66 | sd_event_source *receive_message; |
d1b0afe3 PF |
67 | usec_t retransmit_time; |
68 | uint8_t retransmit_count; | |
69 | sd_event_source *timeout_resend; | |
70 | sd_event_source *timeout_resend_expire; | |
45aa74c7 | 71 | sd_dhcp6_client_callback_t callback; |
139b011a | 72 | void *userdata; |
764aad62 | 73 | struct duid duid; |
66eac120 | 74 | size_t duid_len; |
139b011a PF |
75 | }; |
76 | ||
da6fe470 | 77 | static const uint16_t default_req_opts[] = { |
2c1ab8ca BG |
78 | SD_DHCP6_OPTION_DNS_SERVERS, |
79 | SD_DHCP6_OPTION_DOMAIN_LIST, | |
80 | SD_DHCP6_OPTION_NTP_SERVER, | |
81 | SD_DHCP6_OPTION_SNTP_SERVERS, | |
da6fe470 PF |
82 | }; |
83 | ||
a9aff361 PF |
84 | const char * dhcp6_message_type_table[_DHCP6_MESSAGE_MAX] = { |
85 | [DHCP6_SOLICIT] = "SOLICIT", | |
86 | [DHCP6_ADVERTISE] = "ADVERTISE", | |
87 | [DHCP6_REQUEST] = "REQUEST", | |
88 | [DHCP6_CONFIRM] = "CONFIRM", | |
89 | [DHCP6_RENEW] = "RENEW", | |
90 | [DHCP6_REBIND] = "REBIND", | |
91 | [DHCP6_REPLY] = "REPLY", | |
92 | [DHCP6_RELEASE] = "RELEASE", | |
93 | [DHCP6_DECLINE] = "DECLINE", | |
94 | [DHCP6_RECONFIGURE] = "RECONFIGURE", | |
95 | [DHCP6_INFORMATION_REQUEST] = "INFORMATION-REQUEST", | |
96 | [DHCP6_RELAY_FORW] = "RELAY-FORW", | |
97 | [DHCP6_RELAY_REPL] = "RELAY-REPL", | |
98 | }; | |
99 | ||
100 | DEFINE_STRING_TABLE_LOOKUP(dhcp6_message_type, int); | |
101 | ||
631bbe71 PF |
102 | const char * dhcp6_message_status_table[_DHCP6_STATUS_MAX] = { |
103 | [DHCP6_STATUS_SUCCESS] = "Success", | |
104 | [DHCP6_STATUS_UNSPEC_FAIL] = "Unspecified failure", | |
105 | [DHCP6_STATUS_NO_ADDRS_AVAIL] = "No addresses available", | |
106 | [DHCP6_STATUS_NO_BINDING] = "Binding unavailable", | |
107 | [DHCP6_STATUS_NOT_ON_LINK] = "Not on link", | |
108 | [DHCP6_STATUS_USE_MULTICAST] = "Use multicast", | |
109 | }; | |
110 | ||
111 | DEFINE_STRING_TABLE_LOOKUP(dhcp6_message_status, int); | |
112 | ||
3f0c075f | 113 | #define DHCP6_CLIENT_DONT_DESTROY(client) \ |
4afd3348 | 114 | _cleanup_(sd_dhcp6_client_unrefp) _unused_ sd_dhcp6_client *_dont_destroy_##client = sd_dhcp6_client_ref(client) |
3f0c075f | 115 | |
c3e2adea PF |
116 | static int client_start(sd_dhcp6_client *client, enum DHCP6State state); |
117 | ||
4b558378 ZJS |
118 | int sd_dhcp6_client_set_callback( |
119 | sd_dhcp6_client *client, | |
120 | sd_dhcp6_client_callback_t cb, | |
121 | void *userdata) { | |
45aa74c7 | 122 | |
139b011a PF |
123 | assert_return(client, -EINVAL); |
124 | ||
45aa74c7 | 125 | client->callback = cb; |
139b011a PF |
126 | client->userdata = userdata; |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
2f8e7633 | 131 | int sd_dhcp6_client_set_ifindex(sd_dhcp6_client *client, int ifindex) { |
139b011a | 132 | |
2f8e7633 LP |
133 | assert_return(client, -EINVAL); |
134 | assert_return(ifindex >= -1, -EINVAL); | |
d7c9c21f PF |
135 | assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY); |
136 | ||
2f8e7633 | 137 | client->ifindex = ifindex; |
139b011a PF |
138 | return 0; |
139 | } | |
140 | ||
4b558378 ZJS |
141 | int sd_dhcp6_client_set_local_address( |
142 | sd_dhcp6_client *client, | |
143 | const struct in6_addr *local_address) { | |
144 | ||
c601ebf7 TG |
145 | assert_return(client, -EINVAL); |
146 | assert_return(local_address, -EINVAL); | |
147 | assert_return(in_addr_is_link_local(AF_INET6, (const union in_addr_union *) local_address) > 0, -EINVAL); | |
148 | ||
149 | assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY); | |
150 | ||
151 | client->local_address = *local_address; | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
0ae0e5cd LP |
156 | int sd_dhcp6_client_set_mac( |
157 | sd_dhcp6_client *client, | |
158 | const uint8_t *addr, size_t addr_len, | |
159 | uint16_t arp_type) { | |
160 | ||
139b011a | 161 | assert_return(client, -EINVAL); |
76253e73 DW |
162 | assert_return(addr, -EINVAL); |
163 | assert_return(addr_len > 0 && addr_len <= MAX_MAC_ADDR_LEN, -EINVAL); | |
164 | assert_return(arp_type > 0, -EINVAL); | |
165 | ||
d7c9c21f PF |
166 | assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY); |
167 | ||
76253e73 DW |
168 | if (arp_type == ARPHRD_ETHER) |
169 | assert_return(addr_len == ETH_ALEN, -EINVAL); | |
170 | else if (arp_type == ARPHRD_INFINIBAND) | |
171 | assert_return(addr_len == INFINIBAND_ALEN, -EINVAL); | |
139b011a | 172 | else |
76253e73 DW |
173 | return -EINVAL; |
174 | ||
175 | if (client->mac_addr_len == addr_len && | |
176 | memcmp(&client->mac_addr, addr, addr_len) == 0) | |
177 | return 0; | |
178 | ||
179 | memcpy(&client->mac_addr, addr, addr_len); | |
180 | client->mac_addr_len = addr_len; | |
181 | client->arp_type = arp_type; | |
139b011a PF |
182 | |
183 | return 0; | |
184 | } | |
185 | ||
0ae0e5cd | 186 | static int client_ensure_duid(sd_dhcp6_client *client) { |
cc22955c TH |
187 | if (client->duid_len != 0) |
188 | return 0; | |
0ae0e5cd | 189 | |
cc22955c TH |
190 | return dhcp_identifier_set_duid_en(&client->duid, &client->duid_len); |
191 | } | |
192 | ||
d7df2fd3 ZJS |
193 | /** |
194 | * Sets DUID. If duid is non-null, the DUID is set to duid_type + duid | |
195 | * without further modification. Otherwise, if duid_type is supported, DUID | |
196 | * is set based on that type. Otherwise, an error is returned. | |
197 | */ | |
4b558378 ZJS |
198 | int sd_dhcp6_client_set_duid( |
199 | sd_dhcp6_client *client, | |
200 | uint16_t duid_type, | |
f7a92d1a | 201 | const void *duid, |
4b558378 | 202 | size_t duid_len) { |
f7a92d1a | 203 | |
413708d1 | 204 | int r; |
66eac120 | 205 | assert_return(client, -EINVAL); |
d7df2fd3 | 206 | assert_return(duid_len == 0 || duid != NULL, -EINVAL); |
afec4539 | 207 | assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY); |
c83321e6 | 208 | |
d7df2fd3 | 209 | if (duid != NULL) { |
413708d1 VK |
210 | r = dhcp_validate_duid_len(duid_type, duid_len); |
211 | if (r < 0) | |
212 | return r; | |
d7df2fd3 ZJS |
213 | } |
214 | ||
215 | if (duid != NULL) { | |
413708d1 VK |
216 | client->duid.type = htobe16(duid_type); |
217 | memcpy(&client->duid.raw.data, duid, duid_len); | |
d7df2fd3 ZJS |
218 | client->duid_len = sizeof(client->duid.type) + duid_len; |
219 | } else if (duid_type == DUID_TYPE_EN) { | |
220 | r = dhcp_identifier_set_duid_en(&client->duid, &client->duid_len); | |
221 | if (r < 0) | |
222 | return r; | |
223 | } else | |
224 | return -EOPNOTSUPP; | |
fe4b2156 | 225 | |
413708d1 VK |
226 | return 0; |
227 | } | |
228 | ||
229 | int sd_dhcp6_client_set_iaid(sd_dhcp6_client *client, uint32_t iaid) { | |
230 | assert_return(client, -EINVAL); | |
231 | assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY); | |
232 | ||
233 | client->ia_na.id = htobe32(iaid); | |
66eac120 DW |
234 | |
235 | return 0; | |
236 | } | |
237 | ||
8006aa32 SA |
238 | int sd_dhcp6_client_set_fqdn( |
239 | sd_dhcp6_client *client, | |
240 | const char *fqdn) { | |
241 | ||
242 | assert_return(client, -EINVAL); | |
243 | ||
244 | /* Make sure FQDN qualifies as DNS and as Linux hostname */ | |
245 | if (fqdn && | |
246 | !(hostname_is_valid(fqdn, false) && dns_name_is_valid(fqdn) > 0)) | |
247 | return -EINVAL; | |
248 | ||
249 | return free_and_strdup(&client->fqdn, fqdn); | |
250 | } | |
251 | ||
04c01369 | 252 | int sd_dhcp6_client_set_information_request(sd_dhcp6_client *client, int enabled) { |
bbfa43ca | 253 | assert_return(client, -EINVAL); |
d7c9c21f PF |
254 | assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY); |
255 | ||
bbfa43ca PF |
256 | client->information_request = enabled; |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
04c01369 | 261 | int sd_dhcp6_client_get_information_request(sd_dhcp6_client *client, int *enabled) { |
bbfa43ca PF |
262 | assert_return(client, -EINVAL); |
263 | assert_return(enabled, -EINVAL); | |
264 | ||
265 | *enabled = client->information_request; | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
0ae0e5cd | 270 | int sd_dhcp6_client_set_request_option(sd_dhcp6_client *client, uint16_t option) { |
da6fe470 PF |
271 | size_t t; |
272 | ||
273 | assert_return(client, -EINVAL); | |
274 | assert_return(client->state == DHCP6_STATE_STOPPED, -EBUSY); | |
275 | ||
276 | switch(option) { | |
a1140666 | 277 | |
2c1ab8ca BG |
278 | case SD_DHCP6_OPTION_DNS_SERVERS: |
279 | case SD_DHCP6_OPTION_DOMAIN_LIST: | |
280 | case SD_DHCP6_OPTION_SNTP_SERVERS: | |
281 | case SD_DHCP6_OPTION_NTP_SERVER: | |
da6fe470 PF |
282 | break; |
283 | ||
284 | default: | |
285 | return -EINVAL; | |
286 | } | |
287 | ||
288 | for (t = 0; t < client->req_opts_len; t++) | |
289 | if (client->req_opts[t] == htobe16(option)) | |
290 | return -EEXIST; | |
291 | ||
292 | if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated, | |
293 | client->req_opts_len + 1)) | |
294 | return -ENOMEM; | |
295 | ||
296 | client->req_opts[client->req_opts_len++] = htobe16(option); | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
ea3b3a75 PF |
301 | int sd_dhcp6_client_get_lease(sd_dhcp6_client *client, sd_dhcp6_lease **ret) { |
302 | assert_return(client, -EINVAL); | |
ea3b3a75 PF |
303 | |
304 | if (!client->lease) | |
305 | return -ENOMSG; | |
306 | ||
3098562c TG |
307 | if (ret) |
308 | *ret = client->lease; | |
ea3b3a75 PF |
309 | |
310 | return 0; | |
311 | } | |
312 | ||
3f0c075f | 313 | static void client_notify(sd_dhcp6_client *client, int event) { |
45aa74c7 LP |
314 | assert(client); |
315 | ||
316 | if (client->callback) | |
317 | client->callback(client, event, client->userdata); | |
139b011a PF |
318 | } |
319 | ||
f8908727 | 320 | static void client_set_lease(sd_dhcp6_client *client, sd_dhcp6_lease *lease) { |
a1140666 LP |
321 | assert(client); |
322 | ||
4e3e6679 PF |
323 | if (client->lease) { |
324 | dhcp6_lease_clear_timers(&client->lease->ia); | |
f8908727 | 325 | sd_dhcp6_lease_unref(client->lease); |
4e3e6679 | 326 | } |
a1140666 | 327 | |
f8908727 TH |
328 | client->lease = lease; |
329 | } | |
330 | ||
331 | static int client_reset(sd_dhcp6_client *client) { | |
a1140666 | 332 | assert(client); |
f8908727 TH |
333 | |
334 | client_set_lease(client, NULL); | |
4e3e6679 | 335 | |
a9aff361 PF |
336 | client->receive_message = |
337 | sd_event_source_unref(client->receive_message); | |
338 | ||
c806ffb9 | 339 | client->fd = safe_close(client->fd); |
a9aff361 | 340 | |
c3e2adea | 341 | client->transaction_id = 0; |
346e13a2 | 342 | client->transaction_start = 0; |
a9aff361 | 343 | |
f12abb48 PF |
344 | client->ia_na.timeout_t1 = |
345 | sd_event_source_unref(client->ia_na.timeout_t1); | |
346 | client->ia_na.timeout_t2 = | |
347 | sd_event_source_unref(client->ia_na.timeout_t2); | |
348 | ||
d1b0afe3 PF |
349 | client->retransmit_time = 0; |
350 | client->retransmit_count = 0; | |
351 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); | |
352 | client->timeout_resend_expire = | |
353 | sd_event_source_unref(client->timeout_resend_expire); | |
354 | ||
139b011a PF |
355 | client->state = DHCP6_STATE_STOPPED; |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
3f0c075f PF |
360 | static void client_stop(sd_dhcp6_client *client, int error) { |
361 | DHCP6_CLIENT_DONT_DESTROY(client); | |
139b011a | 362 | |
3f0c075f | 363 | assert(client); |
139b011a | 364 | |
3f0c075f PF |
365 | client_notify(client, error); |
366 | ||
367 | client_reset(client); | |
139b011a PF |
368 | } |
369 | ||
346e13a2 | 370 | static int client_send_message(sd_dhcp6_client *client, usec_t time_now) { |
a9aff361 PF |
371 | _cleanup_free_ DHCP6Message *message = NULL; |
372 | struct in6_addr all_servers = | |
373 | IN6ADDR_ALL_DHCP6_RELAY_AGENTS_AND_SERVERS_INIT; | |
374 | size_t len, optlen = 512; | |
375 | uint8_t *opt; | |
376 | int r; | |
346e13a2 PF |
377 | usec_t elapsed_usec; |
378 | be16_t elapsed_time; | |
a9aff361 | 379 | |
a1140666 LP |
380 | assert(client); |
381 | ||
a9aff361 PF |
382 | len = sizeof(DHCP6Message) + optlen; |
383 | ||
384 | message = malloc0(len); | |
385 | if (!message) | |
386 | return -ENOMEM; | |
387 | ||
388 | opt = (uint8_t *)(message + 1); | |
389 | ||
390 | message->transaction_id = client->transaction_id; | |
391 | ||
392 | switch(client->state) { | |
bbfa43ca PF |
393 | case DHCP6_STATE_INFORMATION_REQUEST: |
394 | message->type = DHCP6_INFORMATION_REQUEST; | |
395 | ||
396 | break; | |
397 | ||
a9aff361 PF |
398 | case DHCP6_STATE_SOLICITATION: |
399 | message->type = DHCP6_SOLICIT; | |
400 | ||
ed6ee219 | 401 | r = dhcp6_option_append(&opt, &optlen, |
2c1ab8ca | 402 | SD_DHCP6_OPTION_RAPID_COMMIT, 0, NULL); |
926695f1 TA |
403 | if (r < 0) |
404 | return r; | |
ed6ee219 | 405 | |
7246333c | 406 | r = dhcp6_option_append_ia(&opt, &optlen, &client->ia_na); |
a9aff361 PF |
407 | if (r < 0) |
408 | return r; | |
409 | ||
8006aa32 SA |
410 | if (client->fqdn) { |
411 | r = dhcp6_option_append_fqdn(&opt, &optlen, client->fqdn); | |
412 | if (r < 0) | |
413 | return r; | |
414 | } | |
415 | ||
7246333c PF |
416 | break; |
417 | ||
418 | case DHCP6_STATE_REQUEST: | |
3dc34fcc PF |
419 | case DHCP6_STATE_RENEW: |
420 | ||
421 | if (client->state == DHCP6_STATE_REQUEST) | |
422 | message->type = DHCP6_REQUEST; | |
423 | else | |
424 | message->type = DHCP6_RENEW; | |
7246333c | 425 | |
2c1ab8ca | 426 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_SERVERID, |
7246333c PF |
427 | client->lease->serverid_len, |
428 | client->lease->serverid); | |
429 | if (r < 0) | |
430 | return r; | |
431 | ||
432 | r = dhcp6_option_append_ia(&opt, &optlen, &client->lease->ia); | |
a9aff361 PF |
433 | if (r < 0) |
434 | return r; | |
435 | ||
8006aa32 SA |
436 | if (client->fqdn) { |
437 | r = dhcp6_option_append_fqdn(&opt, &optlen, client->fqdn); | |
438 | if (r < 0) | |
439 | return r; | |
440 | } | |
441 | ||
a9aff361 PF |
442 | break; |
443 | ||
3dc34fcc PF |
444 | case DHCP6_STATE_REBIND: |
445 | message->type = DHCP6_REBIND; | |
446 | ||
447 | r = dhcp6_option_append_ia(&opt, &optlen, &client->lease->ia); | |
448 | if (r < 0) | |
449 | return r; | |
450 | ||
8006aa32 SA |
451 | if (client->fqdn) { |
452 | r = dhcp6_option_append_fqdn(&opt, &optlen, client->fqdn); | |
453 | if (r < 0) | |
454 | return r; | |
455 | } | |
456 | ||
3dc34fcc PF |
457 | break; |
458 | ||
a9aff361 | 459 | case DHCP6_STATE_STOPPED: |
a34b57c0 | 460 | case DHCP6_STATE_BOUND: |
a9aff361 PF |
461 | return -EINVAL; |
462 | } | |
463 | ||
2c1ab8ca | 464 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_ORO, |
da6fe470 PF |
465 | client->req_opts_len * sizeof(be16_t), |
466 | client->req_opts); | |
467 | if (r < 0) | |
468 | return r; | |
469 | ||
ccd1fc2f | 470 | assert(client->duid_len); |
2c1ab8ca | 471 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_CLIENTID, |
66eac120 | 472 | client->duid_len, &client->duid); |
7246333c PF |
473 | if (r < 0) |
474 | return r; | |
475 | ||
346e13a2 PF |
476 | elapsed_usec = time_now - client->transaction_start; |
477 | if (elapsed_usec < 0xffff * USEC_PER_MSEC * 10) | |
478 | elapsed_time = htobe16(elapsed_usec / USEC_PER_MSEC / 10); | |
479 | else | |
480 | elapsed_time = 0xffff; | |
481 | ||
2c1ab8ca | 482 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_ELAPSED_TIME, |
346e13a2 PF |
483 | sizeof(elapsed_time), &elapsed_time); |
484 | if (r < 0) | |
485 | return r; | |
486 | ||
a9aff361 PF |
487 | r = dhcp6_network_send_udp_socket(client->fd, &all_servers, message, |
488 | len - optlen); | |
489 | if (r < 0) | |
490 | return r; | |
491 | ||
492 | log_dhcp6_client(client, "Sent %s", | |
493 | dhcp6_message_type_to_string(message->type)); | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
4b558378 | 498 | static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) { |
a34b57c0 PF |
499 | sd_dhcp6_client *client = userdata; |
500 | ||
a1140666 LP |
501 | assert(s); |
502 | assert(client); | |
503 | assert(client->lease); | |
a34b57c0 PF |
504 | |
505 | client->lease->ia.timeout_t2 = | |
506 | sd_event_source_unref(client->lease->ia.timeout_t2); | |
507 | ||
508 | log_dhcp6_client(client, "Timeout T2"); | |
509 | ||
3dc34fcc PF |
510 | client_start(client, DHCP6_STATE_REBIND); |
511 | ||
a34b57c0 PF |
512 | return 0; |
513 | } | |
514 | ||
4b558378 | 515 | static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) { |
a34b57c0 PF |
516 | sd_dhcp6_client *client = userdata; |
517 | ||
a1140666 LP |
518 | assert(s); |
519 | assert(client); | |
520 | assert(client->lease); | |
a34b57c0 PF |
521 | |
522 | client->lease->ia.timeout_t1 = | |
523 | sd_event_source_unref(client->lease->ia.timeout_t1); | |
524 | ||
525 | log_dhcp6_client(client, "Timeout T1"); | |
526 | ||
3dc34fcc PF |
527 | client_start(client, DHCP6_STATE_RENEW); |
528 | ||
a34b57c0 PF |
529 | return 0; |
530 | } | |
531 | ||
4b558378 | 532 | static int client_timeout_resend_expire(sd_event_source *s, uint64_t usec, void *userdata) { |
d1b0afe3 | 533 | sd_dhcp6_client *client = userdata; |
3dc34fcc PF |
534 | DHCP6_CLIENT_DONT_DESTROY(client); |
535 | enum DHCP6State state; | |
d1b0afe3 PF |
536 | |
537 | assert(s); | |
538 | assert(client); | |
539 | assert(client->event); | |
540 | ||
3dc34fcc PF |
541 | state = client->state; |
542 | ||
10c9ce61 | 543 | client_stop(client, SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE); |
d1b0afe3 | 544 | |
3dc34fcc PF |
545 | /* RFC 3315, section 18.1.4., says that "...the client may choose to |
546 | use a Solicit message to locate a new DHCP server..." */ | |
547 | if (state == DHCP6_STATE_REBIND) | |
548 | client_start(client, DHCP6_STATE_SOLICITATION); | |
549 | ||
d1b0afe3 PF |
550 | return 0; |
551 | } | |
552 | ||
553 | static usec_t client_timeout_compute_random(usec_t val) { | |
554 | return val - val / 10 + | |
555 | (random_u32() % (2 * USEC_PER_SEC)) * val / 10 / USEC_PER_SEC; | |
556 | } | |
557 | ||
4b558378 | 558 | static int client_timeout_resend(sd_event_source *s, uint64_t usec, void *userdata) { |
d1b0afe3 PF |
559 | int r = 0; |
560 | sd_dhcp6_client *client = userdata; | |
4b4923e6 | 561 | usec_t time_now, init_retransmit_time = 0, max_retransmit_time = 0; |
5e913450 | 562 | usec_t max_retransmit_duration = 0; |
513a6fa8 | 563 | uint8_t max_retransmit_count = 0; |
d1b0afe3 | 564 | char time_string[FORMAT_TIMESPAN_MAX]; |
3dc34fcc | 565 | uint32_t expire = 0; |
d1b0afe3 PF |
566 | |
567 | assert(s); | |
568 | assert(client); | |
569 | assert(client->event); | |
570 | ||
571 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); | |
572 | ||
573 | switch (client->state) { | |
bbfa43ca PF |
574 | case DHCP6_STATE_INFORMATION_REQUEST: |
575 | init_retransmit_time = DHCP6_INF_TIMEOUT; | |
576 | max_retransmit_time = DHCP6_INF_MAX_RT; | |
577 | ||
578 | break; | |
579 | ||
d1b0afe3 | 580 | case DHCP6_STATE_SOLICITATION: |
7246333c PF |
581 | |
582 | if (client->retransmit_count && client->lease) { | |
583 | client_start(client, DHCP6_STATE_REQUEST); | |
584 | return 0; | |
585 | } | |
586 | ||
d1b0afe3 PF |
587 | init_retransmit_time = DHCP6_SOL_TIMEOUT; |
588 | max_retransmit_time = DHCP6_SOL_MAX_RT; | |
d1b0afe3 PF |
589 | |
590 | break; | |
591 | ||
7246333c PF |
592 | case DHCP6_STATE_REQUEST: |
593 | init_retransmit_time = DHCP6_REQ_TIMEOUT; | |
594 | max_retransmit_time = DHCP6_REQ_MAX_RT; | |
595 | max_retransmit_count = DHCP6_REQ_MAX_RC; | |
7246333c PF |
596 | |
597 | break; | |
598 | ||
3dc34fcc PF |
599 | case DHCP6_STATE_RENEW: |
600 | init_retransmit_time = DHCP6_REN_TIMEOUT; | |
601 | max_retransmit_time = DHCP6_REN_MAX_RT; | |
3dc34fcc PF |
602 | |
603 | /* RFC 3315, section 18.1.3. says max retransmit duration will | |
604 | be the remaining time until T2. Instead of setting MRD, | |
605 | wait for T2 to trigger with the same end result */ | |
3dc34fcc PF |
606 | |
607 | break; | |
608 | ||
609 | case DHCP6_STATE_REBIND: | |
610 | init_retransmit_time = DHCP6_REB_TIMEOUT; | |
611 | max_retransmit_time = DHCP6_REB_MAX_RT; | |
3dc34fcc PF |
612 | |
613 | if (!client->timeout_resend_expire) { | |
614 | r = dhcp6_lease_ia_rebind_expire(&client->lease->ia, | |
615 | &expire); | |
616 | if (r < 0) { | |
617 | client_stop(client, r); | |
618 | return 0; | |
619 | } | |
620 | max_retransmit_duration = expire * USEC_PER_SEC; | |
621 | } | |
622 | ||
623 | break; | |
624 | ||
d1b0afe3 | 625 | case DHCP6_STATE_STOPPED: |
a34b57c0 | 626 | case DHCP6_STATE_BOUND: |
d1b0afe3 PF |
627 | return 0; |
628 | } | |
629 | ||
630 | if (max_retransmit_count && | |
631 | client->retransmit_count >= max_retransmit_count) { | |
10c9ce61 | 632 | client_stop(client, SD_DHCP6_CLIENT_EVENT_RETRANS_MAX); |
d1b0afe3 PF |
633 | return 0; |
634 | } | |
635 | ||
fa94c34b | 636 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
d1b0afe3 PF |
637 | if (r < 0) |
638 | goto error; | |
639 | ||
346e13a2 PF |
640 | r = client_send_message(client, time_now); |
641 | if (r >= 0) | |
642 | client->retransmit_count++; | |
643 | ||
d1b0afe3 PF |
644 | if (!client->retransmit_time) { |
645 | client->retransmit_time = | |
646 | client_timeout_compute_random(init_retransmit_time); | |
a9aff361 PF |
647 | |
648 | if (client->state == DHCP6_STATE_SOLICITATION) | |
649 | client->retransmit_time += init_retransmit_time / 10; | |
650 | ||
d1b0afe3 PF |
651 | } else { |
652 | if (max_retransmit_time && | |
653 | client->retransmit_time > max_retransmit_time / 2) | |
654 | client->retransmit_time = client_timeout_compute_random(max_retransmit_time); | |
655 | else | |
656 | client->retransmit_time += client_timeout_compute_random(client->retransmit_time); | |
657 | } | |
658 | ||
659 | log_dhcp6_client(client, "Next retransmission in %s", | |
ed19c567 | 660 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, client->retransmit_time, USEC_PER_SEC)); |
d1b0afe3 PF |
661 | |
662 | r = sd_event_add_time(client->event, &client->timeout_resend, | |
fa94c34b | 663 | clock_boottime_or_monotonic(), |
d1b0afe3 PF |
664 | time_now + client->retransmit_time, |
665 | 10 * USEC_PER_MSEC, client_timeout_resend, | |
666 | client); | |
667 | if (r < 0) | |
668 | goto error; | |
669 | ||
670 | r = sd_event_source_set_priority(client->timeout_resend, | |
671 | client->event_priority); | |
672 | if (r < 0) | |
673 | goto error; | |
674 | ||
356779df | 675 | r = sd_event_source_set_description(client->timeout_resend, "dhcp6-resend-timer"); |
9021bb9f TG |
676 | if (r < 0) |
677 | goto error; | |
678 | ||
d1b0afe3 PF |
679 | if (max_retransmit_duration && !client->timeout_resend_expire) { |
680 | ||
681 | log_dhcp6_client(client, "Max retransmission duration %"PRIu64" secs", | |
682 | max_retransmit_duration / USEC_PER_SEC); | |
683 | ||
684 | r = sd_event_add_time(client->event, | |
685 | &client->timeout_resend_expire, | |
fa94c34b | 686 | clock_boottime_or_monotonic(), |
d1b0afe3 PF |
687 | time_now + max_retransmit_duration, |
688 | USEC_PER_SEC, | |
689 | client_timeout_resend_expire, client); | |
690 | if (r < 0) | |
691 | goto error; | |
692 | ||
693 | r = sd_event_source_set_priority(client->timeout_resend_expire, | |
694 | client->event_priority); | |
695 | if (r < 0) | |
696 | goto error; | |
9021bb9f | 697 | |
356779df | 698 | r = sd_event_source_set_description(client->timeout_resend_expire, "dhcp6-resend-expire-timer"); |
9021bb9f TG |
699 | if (r < 0) |
700 | goto error; | |
d1b0afe3 PF |
701 | } |
702 | ||
703 | error: | |
704 | if (r < 0) | |
705 | client_stop(client, r); | |
706 | ||
707 | return 0; | |
708 | } | |
709 | ||
f12abb48 | 710 | static int client_ensure_iaid(sd_dhcp6_client *client) { |
cfb5b380 | 711 | int r; |
f12abb48 PF |
712 | |
713 | assert(client); | |
714 | ||
715 | if (client->ia_na.id) | |
716 | return 0; | |
717 | ||
2f8e7633 | 718 | r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, client->mac_addr_len, &client->ia_na.id); |
cfb5b380 TG |
719 | if (r < 0) |
720 | return r; | |
f12abb48 PF |
721 | |
722 | return 0; | |
723 | } | |
724 | ||
4b558378 ZJS |
725 | static int client_parse_message( |
726 | sd_dhcp6_client *client, | |
727 | DHCP6Message *message, | |
728 | size_t len, | |
729 | sd_dhcp6_lease *lease) { | |
631bbe71 | 730 | int r; |
44481a8b | 731 | uint8_t *optval, *option, *id = NULL; |
631bbe71 PF |
732 | uint16_t optcode, status; |
733 | size_t optlen, id_len; | |
734 | bool clientid = false; | |
735 | be32_t iaid_lease; | |
736 | ||
a1140666 LP |
737 | assert(client); |
738 | assert(message); | |
739 | assert(len >= sizeof(DHCP6Message)); | |
740 | assert(lease); | |
741 | ||
44481a8b ZJS |
742 | option = (uint8_t *)message + sizeof(DHCP6Message); |
743 | len -= sizeof(DHCP6Message); | |
744 | ||
631bbe71 PF |
745 | while ((r = dhcp6_option_parse(&option, &len, &optcode, &optlen, |
746 | &optval)) >= 0) { | |
747 | switch (optcode) { | |
2c1ab8ca | 748 | case SD_DHCP6_OPTION_CLIENTID: |
631bbe71 PF |
749 | if (clientid) { |
750 | log_dhcp6_client(client, "%s contains multiple clientids", | |
751 | dhcp6_message_type_to_string(message->type)); | |
752 | return -EINVAL; | |
753 | } | |
754 | ||
66eac120 | 755 | if (optlen != client->duid_len || |
631bbe71 PF |
756 | memcmp(&client->duid, optval, optlen) != 0) { |
757 | log_dhcp6_client(client, "%s DUID does not match", | |
758 | dhcp6_message_type_to_string(message->type)); | |
759 | ||
760 | return -EINVAL; | |
761 | } | |
762 | clientid = true; | |
763 | ||
764 | break; | |
765 | ||
2c1ab8ca | 766 | case SD_DHCP6_OPTION_SERVERID: |
631bbe71 PF |
767 | r = dhcp6_lease_get_serverid(lease, &id, &id_len); |
768 | if (r >= 0 && id) { | |
769 | log_dhcp6_client(client, "%s contains multiple serverids", | |
770 | dhcp6_message_type_to_string(message->type)); | |
771 | return -EINVAL; | |
772 | } | |
773 | ||
774 | r = dhcp6_lease_set_serverid(lease, optval, optlen); | |
775 | if (r < 0) | |
776 | return r; | |
777 | ||
778 | break; | |
779 | ||
2c1ab8ca | 780 | case SD_DHCP6_OPTION_PREFERENCE: |
631bbe71 PF |
781 | if (optlen != 1) |
782 | return -EINVAL; | |
783 | ||
784 | r = dhcp6_lease_set_preference(lease, *optval); | |
785 | if (r < 0) | |
786 | return r; | |
787 | ||
788 | break; | |
789 | ||
2c1ab8ca | 790 | case SD_DHCP6_OPTION_STATUS_CODE: |
631bbe71 PF |
791 | if (optlen < 2) |
792 | return -EINVAL; | |
793 | ||
794 | status = optval[0] << 8 | optval[1]; | |
795 | if (status) { | |
796 | log_dhcp6_client(client, "%s Status %s", | |
797 | dhcp6_message_type_to_string(message->type), | |
798 | dhcp6_message_status_to_string(status)); | |
799 | return -EINVAL; | |
800 | } | |
801 | ||
802 | break; | |
803 | ||
2c1ab8ca | 804 | case SD_DHCP6_OPTION_IA_NA: |
bbfa43ca PF |
805 | if (client->state == DHCP6_STATE_INFORMATION_REQUEST) { |
806 | log_dhcp6_client(client, "Information request ignoring IA NA option"); | |
807 | ||
808 | break; | |
809 | } | |
810 | ||
631bbe71 PF |
811 | r = dhcp6_option_parse_ia(&optval, &optlen, optcode, |
812 | &lease->ia); | |
813 | if (r < 0 && r != -ENOMSG) | |
814 | return r; | |
815 | ||
816 | r = dhcp6_lease_get_iaid(lease, &iaid_lease); | |
817 | if (r < 0) | |
818 | return r; | |
819 | ||
820 | if (client->ia_na.id != iaid_lease) { | |
821 | log_dhcp6_client(client, "%s has wrong IAID", | |
822 | dhcp6_message_type_to_string(message->type)); | |
823 | return -EINVAL; | |
824 | } | |
825 | ||
826 | break; | |
ed6ee219 | 827 | |
2c1ab8ca | 828 | case SD_DHCP6_OPTION_RAPID_COMMIT: |
ed6ee219 PF |
829 | r = dhcp6_lease_set_rapid_commit(lease); |
830 | if (r < 0) | |
831 | return r; | |
832 | ||
833 | break; | |
7bd8e95d | 834 | |
2c1ab8ca | 835 | case SD_DHCP6_OPTION_DNS_SERVERS: |
7bd8e95d PF |
836 | r = dhcp6_lease_set_dns(lease, optval, optlen); |
837 | if (r < 0) | |
838 | return r; | |
839 | ||
840 | break; | |
5da1b97f | 841 | |
2c1ab8ca | 842 | case SD_DHCP6_OPTION_DOMAIN_LIST: |
5da1b97f PF |
843 | r = dhcp6_lease_set_domains(lease, optval, optlen); |
844 | if (r < 0) | |
845 | return r; | |
846 | ||
847 | break; | |
848 | ||
2c1ab8ca | 849 | case SD_DHCP6_OPTION_NTP_SERVER: |
6599680e PF |
850 | r = dhcp6_lease_set_ntp(lease, optval, optlen); |
851 | if (r < 0) | |
852 | return r; | |
853 | ||
854 | break; | |
41e4615d | 855 | |
2c1ab8ca | 856 | case SD_DHCP6_OPTION_SNTP_SERVERS: |
41e4615d PF |
857 | r = dhcp6_lease_set_sntp(lease, optval, optlen); |
858 | if (r < 0) | |
859 | return r; | |
860 | ||
861 | break; | |
631bbe71 | 862 | } |
6599680e | 863 | |
631bbe71 PF |
864 | } |
865 | ||
c47e8936 PF |
866 | if (r == -ENOMSG) |
867 | r = 0; | |
868 | ||
869 | if (r < 0 || !clientid) { | |
631bbe71 PF |
870 | log_dhcp6_client(client, "%s has incomplete options", |
871 | dhcp6_message_type_to_string(message->type)); | |
872 | return -EINVAL; | |
873 | } | |
874 | ||
bbfa43ca PF |
875 | if (client->state != DHCP6_STATE_INFORMATION_REQUEST) { |
876 | r = dhcp6_lease_get_serverid(lease, &id, &id_len); | |
877 | if (r < 0) | |
878 | log_dhcp6_client(client, "%s has no server id", | |
879 | dhcp6_message_type_to_string(message->type)); | |
880 | } | |
631bbe71 PF |
881 | |
882 | return r; | |
883 | } | |
884 | ||
0ae0e5cd | 885 | static int client_receive_reply(sd_dhcp6_client *client, DHCP6Message *reply, size_t len) { |
4afd3348 | 886 | _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; |
ed6ee219 | 887 | bool rapid_commit; |
a1140666 LP |
888 | int r; |
889 | ||
890 | assert(client); | |
891 | assert(reply); | |
a34b57c0 PF |
892 | |
893 | if (reply->type != DHCP6_REPLY) | |
ed6ee219 | 894 | return 0; |
a34b57c0 PF |
895 | |
896 | r = dhcp6_lease_new(&lease); | |
897 | if (r < 0) | |
898 | return -ENOMEM; | |
899 | ||
900 | r = client_parse_message(client, reply, len, lease); | |
901 | if (r < 0) | |
902 | return r; | |
903 | ||
ed6ee219 PF |
904 | if (client->state == DHCP6_STATE_SOLICITATION) { |
905 | r = dhcp6_lease_get_rapid_commit(lease, &rapid_commit); | |
906 | if (r < 0) | |
907 | return r; | |
908 | ||
909 | if (!rapid_commit) | |
910 | return 0; | |
911 | } | |
912 | ||
f8908727 | 913 | client_set_lease(client, lease); |
9d89d1ae | 914 | lease = NULL; |
a34b57c0 PF |
915 | |
916 | return DHCP6_STATE_BOUND; | |
917 | } | |
918 | ||
0ae0e5cd | 919 | static int client_receive_advertise(sd_dhcp6_client *client, DHCP6Message *advertise, size_t len) { |
4afd3348 | 920 | _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; |
631bbe71 | 921 | uint8_t pref_advertise = 0, pref_lease = 0; |
a1140666 | 922 | int r; |
631bbe71 PF |
923 | |
924 | if (advertise->type != DHCP6_ADVERTISE) | |
ed6ee219 | 925 | return 0; |
631bbe71 PF |
926 | |
927 | r = dhcp6_lease_new(&lease); | |
928 | if (r < 0) | |
929 | return r; | |
930 | ||
931 | r = client_parse_message(client, advertise, len, lease); | |
932 | if (r < 0) | |
933 | return r; | |
934 | ||
935 | r = dhcp6_lease_get_preference(lease, &pref_advertise); | |
936 | if (r < 0) | |
937 | return r; | |
938 | ||
939 | r = dhcp6_lease_get_preference(client->lease, &pref_lease); | |
bbfa43ca PF |
940 | |
941 | if (r < 0 || pref_advertise > pref_lease) { | |
f8908727 | 942 | client_set_lease(client, lease); |
631bbe71 PF |
943 | lease = NULL; |
944 | r = 0; | |
945 | } | |
946 | ||
7246333c PF |
947 | if (pref_advertise == 255 || client->retransmit_count > 1) |
948 | r = DHCP6_STATE_REQUEST; | |
949 | ||
631bbe71 PF |
950 | return r; |
951 | } | |
952 | ||
004845d1 LP |
953 | static int client_receive_message( |
954 | sd_event_source *s, | |
955 | int fd, uint32_t | |
956 | revents, | |
957 | void *userdata) { | |
958 | ||
631bbe71 | 959 | sd_dhcp6_client *client = userdata; |
3f0c075f | 960 | DHCP6_CLIENT_DONT_DESTROY(client); |
0d43d2fc | 961 | _cleanup_free_ DHCP6Message *message = NULL; |
4edc2c9b LP |
962 | ssize_t buflen, len; |
963 | int r = 0; | |
631bbe71 PF |
964 | |
965 | assert(s); | |
966 | assert(client); | |
967 | assert(client->event); | |
968 | ||
4edc2c9b LP |
969 | buflen = next_datagram_size_fd(fd); |
970 | if (buflen < 0) | |
971 | return buflen; | |
631bbe71 | 972 | |
0d43d2fc | 973 | message = malloc(buflen); |
631bbe71 PF |
974 | if (!message) |
975 | return -ENOMEM; | |
976 | ||
cf447cb6 | 977 | len = recv(fd, message, buflen, 0); |
0d43d2fc | 978 | if (len < 0) { |
4c701096 | 979 | if (IN_SET(errno, EAGAIN, EINTR)) |
0d43d2fc TG |
980 | return 0; |
981 | ||
bd9a7221 | 982 | return log_dhcp6_client_errno(client, errno, "Could not receive message from UDP socket: %m"); |
0d43d2fc | 983 | |
004845d1 LP |
984 | } |
985 | if ((size_t) len < sizeof(DHCP6Message)) { | |
986 | log_dhcp6_client(client, "Too small to be DHCP6 message: ignoring"); | |
631bbe71 | 987 | return 0; |
004845d1 | 988 | } |
631bbe71 PF |
989 | |
990 | switch(message->type) { | |
991 | case DHCP6_SOLICIT: | |
992 | case DHCP6_REQUEST: | |
993 | case DHCP6_CONFIRM: | |
994 | case DHCP6_RENEW: | |
995 | case DHCP6_REBIND: | |
996 | case DHCP6_RELEASE: | |
997 | case DHCP6_DECLINE: | |
998 | case DHCP6_INFORMATION_REQUEST: | |
999 | case DHCP6_RELAY_FORW: | |
1000 | case DHCP6_RELAY_REPL: | |
1001 | return 0; | |
1002 | ||
1003 | case DHCP6_ADVERTISE: | |
1004 | case DHCP6_REPLY: | |
1005 | case DHCP6_RECONFIGURE: | |
1006 | break; | |
1007 | ||
1008 | default: | |
bd9a7221 | 1009 | log_dhcp6_client(client, "Unknown message type %d", message->type); |
631bbe71 PF |
1010 | return 0; |
1011 | } | |
1012 | ||
1013 | if (client->transaction_id != (message->transaction_id & | |
1014 | htobe32(0x00ffffff))) | |
1015 | return 0; | |
1016 | ||
1017 | switch (client->state) { | |
bbfa43ca PF |
1018 | case DHCP6_STATE_INFORMATION_REQUEST: |
1019 | r = client_receive_reply(client, message, len); | |
1020 | if (r < 0) | |
1021 | return 0; | |
1022 | ||
10c9ce61 | 1023 | client_notify(client, SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST); |
bbfa43ca PF |
1024 | |
1025 | client_start(client, DHCP6_STATE_STOPPED); | |
1026 | ||
1027 | break; | |
1028 | ||
631bbe71 PF |
1029 | case DHCP6_STATE_SOLICITATION: |
1030 | r = client_receive_advertise(client, message, len); | |
1031 | ||
ed6ee219 | 1032 | if (r == DHCP6_STATE_REQUEST) { |
7246333c PF |
1033 | client_start(client, r); |
1034 | ||
ed6ee219 PF |
1035 | break; |
1036 | } | |
631bbe71 | 1037 | |
ec251fe7 | 1038 | /* fall through */ /* for Soliciation Rapid Commit option check */ |
7246333c | 1039 | case DHCP6_STATE_REQUEST: |
3dc34fcc PF |
1040 | case DHCP6_STATE_RENEW: |
1041 | case DHCP6_STATE_REBIND: | |
1042 | ||
a34b57c0 PF |
1043 | r = client_receive_reply(client, message, len); |
1044 | if (r < 0) | |
1045 | return 0; | |
1046 | ||
1047 | if (r == DHCP6_STATE_BOUND) { | |
1048 | ||
1049 | r = client_start(client, DHCP6_STATE_BOUND); | |
1050 | if (r < 0) { | |
1051 | client_stop(client, r); | |
1052 | return 0; | |
1053 | } | |
1054 | ||
10c9ce61 | 1055 | client_notify(client, SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE); |
a34b57c0 PF |
1056 | } |
1057 | ||
1058 | break; | |
1059 | ||
1060 | case DHCP6_STATE_BOUND: | |
1061 | ||
1062 | break; | |
1063 | ||
631bbe71 | 1064 | case DHCP6_STATE_STOPPED: |
631bbe71 PF |
1065 | return 0; |
1066 | } | |
1067 | ||
bd9a7221 | 1068 | if (r >= 0) |
631bbe71 PF |
1069 | log_dhcp6_client(client, "Recv %s", |
1070 | dhcp6_message_type_to_string(message->type)); | |
631bbe71 | 1071 | |
a9aff361 PF |
1072 | return 0; |
1073 | } | |
1074 | ||
0ae0e5cd | 1075 | static int client_start(sd_dhcp6_client *client, enum DHCP6State state) { |
f12abb48 | 1076 | int r; |
a34b57c0 PF |
1077 | usec_t timeout, time_now; |
1078 | char time_string[FORMAT_TIMESPAN_MAX]; | |
f12abb48 PF |
1079 | |
1080 | assert_return(client, -EINVAL); | |
1081 | assert_return(client->event, -EINVAL); | |
2f8e7633 | 1082 | assert_return(client->ifindex > 0, -EINVAL); |
c3e2adea | 1083 | assert_return(client->state != state, -EINVAL); |
f12abb48 | 1084 | |
c3e2adea PF |
1085 | client->timeout_resend_expire = |
1086 | sd_event_source_unref(client->timeout_resend_expire); | |
1087 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); | |
1088 | client->retransmit_time = 0; | |
1089 | client->retransmit_count = 0; | |
f12abb48 | 1090 | |
38a03f06 LP |
1091 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
1092 | if (r < 0) | |
1093 | return r; | |
346e13a2 | 1094 | |
c3e2adea PF |
1095 | switch (state) { |
1096 | case DHCP6_STATE_STOPPED: | |
bbfa43ca PF |
1097 | if (client->state == DHCP6_STATE_INFORMATION_REQUEST) { |
1098 | client->state = DHCP6_STATE_STOPPED; | |
a9aff361 | 1099 | |
bbfa43ca PF |
1100 | return 0; |
1101 | } | |
9021bb9f | 1102 | |
bbfa43ca PF |
1103 | /* fall through */ |
1104 | case DHCP6_STATE_SOLICITATION: | |
c3e2adea PF |
1105 | client->state = DHCP6_STATE_SOLICITATION; |
1106 | ||
7246333c PF |
1107 | break; |
1108 | ||
bbfa43ca | 1109 | case DHCP6_STATE_INFORMATION_REQUEST: |
7246333c | 1110 | case DHCP6_STATE_REQUEST: |
3dc34fcc PF |
1111 | case DHCP6_STATE_RENEW: |
1112 | case DHCP6_STATE_REBIND: | |
a34b57c0 | 1113 | |
7246333c PF |
1114 | client->state = state; |
1115 | ||
c3e2adea | 1116 | break; |
a34b57c0 PF |
1117 | |
1118 | case DHCP6_STATE_BOUND: | |
1119 | ||
a34b57c0 PF |
1120 | if (client->lease->ia.lifetime_t1 == 0xffffffff || |
1121 | client->lease->ia.lifetime_t2 == 0xffffffff) { | |
1122 | ||
bd9a7221 | 1123 | log_dhcp6_client(client, "Infinite T1 0x%08x or T2 0x%08x", |
a34b57c0 PF |
1124 | be32toh(client->lease->ia.lifetime_t1), |
1125 | be32toh(client->lease->ia.lifetime_t2)); | |
1126 | ||
1127 | return 0; | |
1128 | } | |
1129 | ||
1130 | timeout = client_timeout_compute_random(be32toh(client->lease->ia.lifetime_t1) * USEC_PER_SEC); | |
1131 | ||
1132 | log_dhcp6_client(client, "T1 expires in %s", | |
ed19c567 | 1133 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, timeout, USEC_PER_SEC)); |
a34b57c0 PF |
1134 | |
1135 | r = sd_event_add_time(client->event, | |
1136 | &client->lease->ia.timeout_t1, | |
fa94c34b | 1137 | clock_boottime_or_monotonic(), time_now + timeout, |
a34b57c0 PF |
1138 | 10 * USEC_PER_SEC, client_timeout_t1, |
1139 | client); | |
1140 | if (r < 0) | |
1141 | return r; | |
1142 | ||
1143 | r = sd_event_source_set_priority(client->lease->ia.timeout_t1, | |
1144 | client->event_priority); | |
1145 | if (r < 0) | |
1146 | return r; | |
1147 | ||
356779df | 1148 | r = sd_event_source_set_description(client->lease->ia.timeout_t1, "dhcp6-t1-timeout"); |
9021bb9f TG |
1149 | if (r < 0) |
1150 | return r; | |
1151 | ||
a34b57c0 PF |
1152 | timeout = client_timeout_compute_random(be32toh(client->lease->ia.lifetime_t2) * USEC_PER_SEC); |
1153 | ||
1154 | log_dhcp6_client(client, "T2 expires in %s", | |
ed19c567 | 1155 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, timeout, USEC_PER_SEC)); |
a34b57c0 PF |
1156 | |
1157 | r = sd_event_add_time(client->event, | |
1158 | &client->lease->ia.timeout_t2, | |
fa94c34b | 1159 | clock_boottime_or_monotonic(), time_now + timeout, |
a34b57c0 PF |
1160 | 10 * USEC_PER_SEC, client_timeout_t2, |
1161 | client); | |
1162 | if (r < 0) | |
1163 | return r; | |
1164 | ||
1165 | r = sd_event_source_set_priority(client->lease->ia.timeout_t2, | |
1166 | client->event_priority); | |
1167 | if (r < 0) | |
1168 | return r; | |
1169 | ||
356779df | 1170 | r = sd_event_source_set_description(client->lease->ia.timeout_t2, "dhcp6-t2-timeout"); |
9021bb9f TG |
1171 | if (r < 0) |
1172 | return r; | |
1173 | ||
3dc34fcc PF |
1174 | client->state = state; |
1175 | ||
a34b57c0 | 1176 | return 0; |
c3e2adea | 1177 | } |
a9aff361 | 1178 | |
c3e2adea | 1179 | client->transaction_id = random_u32() & htobe32(0x00ffffff); |
346e13a2 | 1180 | client->transaction_start = time_now; |
d1b0afe3 PF |
1181 | |
1182 | r = sd_event_add_time(client->event, &client->timeout_resend, | |
fa94c34b | 1183 | clock_boottime_or_monotonic(), 0, 0, client_timeout_resend, |
d1b0afe3 PF |
1184 | client); |
1185 | if (r < 0) | |
1186 | return r; | |
1187 | ||
1188 | r = sd_event_source_set_priority(client->timeout_resend, | |
1189 | client->event_priority); | |
1190 | if (r < 0) | |
1191 | return r; | |
1192 | ||
356779df | 1193 | r = sd_event_source_set_description(client->timeout_resend, "dhcp6-resend-timeout"); |
9021bb9f TG |
1194 | if (r < 0) |
1195 | return r; | |
1196 | ||
f12abb48 PF |
1197 | return 0; |
1198 | } | |
1199 | ||
0ae0e5cd | 1200 | int sd_dhcp6_client_stop(sd_dhcp6_client *client) { |
f667c150 TG |
1201 | assert_return(client, -EINVAL); |
1202 | ||
10c9ce61 | 1203 | client_stop(client, SD_DHCP6_CLIENT_EVENT_STOP); |
139b011a PF |
1204 | |
1205 | return 0; | |
1206 | } | |
1207 | ||
f667c150 TG |
1208 | int sd_dhcp6_client_is_running(sd_dhcp6_client *client) { |
1209 | assert_return(client, -EINVAL); | |
1210 | ||
1211 | return client->state != DHCP6_STATE_STOPPED; | |
1212 | } | |
1213 | ||
0ae0e5cd | 1214 | int sd_dhcp6_client_start(sd_dhcp6_client *client) { |
bbfa43ca | 1215 | enum DHCP6State state = DHCP6_STATE_SOLICITATION; |
2f8e7633 | 1216 | int r = 0; |
139b011a PF |
1217 | |
1218 | assert_return(client, -EINVAL); | |
1219 | assert_return(client->event, -EINVAL); | |
2f8e7633 | 1220 | assert_return(client->ifindex > 0, -EINVAL); |
c601ebf7 | 1221 | assert_return(in_addr_is_link_local(AF_INET6, (const union in_addr_union *) &client->local_address) > 0, -EINVAL); |
139b011a | 1222 | |
d7c9c21f | 1223 | if (!IN_SET(client->state, DHCP6_STATE_STOPPED)) |
63348d13 | 1224 | return -EBUSY; |
d7c9c21f | 1225 | |
c806ffb9 | 1226 | r = client_reset(client); |
f12abb48 PF |
1227 | if (r < 0) |
1228 | return r; | |
1229 | ||
bbfa43ca PF |
1230 | r = client_ensure_iaid(client); |
1231 | if (r < 0) | |
1232 | return r; | |
1233 | ||
cc22955c TH |
1234 | r = client_ensure_duid(client); |
1235 | if (r < 0) | |
1236 | return r; | |
1237 | ||
2f8e7633 | 1238 | r = dhcp6_network_bind_udp_socket(client->ifindex, &client->local_address); |
bd9a7221 ZJS |
1239 | if (r < 0) { |
1240 | _cleanup_free_ char *p = NULL; | |
1241 | ||
1242 | (void) in_addr_to_string(AF_INET6, (const union in_addr_union*) &client->local_address, &p); | |
1243 | return log_dhcp6_client_errno(client, r, | |
1244 | "Failed to bind to UDP socket at address %s: %m", strna(p)); | |
1245 | } | |
bbfa43ca PF |
1246 | |
1247 | client->fd = r; | |
1248 | ||
1249 | r = sd_event_add_io(client->event, &client->receive_message, | |
1250 | client->fd, EPOLLIN, client_receive_message, | |
1251 | client); | |
1252 | if (r < 0) | |
1253 | goto error; | |
1254 | ||
1255 | r = sd_event_source_set_priority(client->receive_message, | |
1256 | client->event_priority); | |
1257 | if (r < 0) | |
1258 | goto error; | |
1259 | ||
1260 | r = sd_event_source_set_description(client->receive_message, | |
483d099e | 1261 | "dhcp6-receive-message"); |
bbfa43ca PF |
1262 | if (r < 0) |
1263 | goto error; | |
1264 | ||
1265 | if (client->information_request) | |
1266 | state = DHCP6_STATE_INFORMATION_REQUEST; | |
1267 | ||
1268 | log_dhcp6_client(client, "Started in %s mode", | |
483d099e ZJS |
1269 | client->information_request? "Information request": |
1270 | "Managed"); | |
bbfa43ca PF |
1271 | |
1272 | return client_start(client, state); | |
1273 | ||
1274 | error: | |
1275 | client_reset(client); | |
1276 | return r; | |
139b011a PF |
1277 | } |
1278 | ||
32d20645 | 1279 | int sd_dhcp6_client_attach_event(sd_dhcp6_client *client, sd_event *event, int64_t priority) { |
139b011a PF |
1280 | int r; |
1281 | ||
1282 | assert_return(client, -EINVAL); | |
1283 | assert_return(!client->event, -EBUSY); | |
1284 | ||
1285 | if (event) | |
1286 | client->event = sd_event_ref(event); | |
1287 | else { | |
1288 | r = sd_event_default(&client->event); | |
1289 | if (r < 0) | |
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | client->event_priority = priority; | |
1294 | ||
1295 | return 0; | |
1296 | } | |
1297 | ||
1298 | int sd_dhcp6_client_detach_event(sd_dhcp6_client *client) { | |
1299 | assert_return(client, -EINVAL); | |
1300 | ||
1301 | client->event = sd_event_unref(client->event); | |
1302 | ||
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | sd_event *sd_dhcp6_client_get_event(sd_dhcp6_client *client) { | |
a1140666 | 1307 | assert_return(client, NULL); |
139b011a PF |
1308 | |
1309 | return client->event; | |
1310 | } | |
1311 | ||
1312 | sd_dhcp6_client *sd_dhcp6_client_ref(sd_dhcp6_client *client) { | |
3733eec3 LP |
1313 | |
1314 | if (!client) | |
1315 | return NULL; | |
1316 | ||
1317 | assert(client->n_ref >= 1); | |
1318 | client->n_ref++; | |
139b011a PF |
1319 | |
1320 | return client; | |
1321 | } | |
1322 | ||
1323 | sd_dhcp6_client *sd_dhcp6_client_unref(sd_dhcp6_client *client) { | |
139b011a | 1324 | |
3733eec3 LP |
1325 | if (!client) |
1326 | return NULL; | |
139b011a | 1327 | |
3733eec3 LP |
1328 | assert(client->n_ref >= 1); |
1329 | client->n_ref--; | |
139b011a | 1330 | |
3733eec3 | 1331 | if (client->n_ref > 0) |
139b011a | 1332 | return NULL; |
139b011a | 1333 | |
3733eec3 LP |
1334 | client_reset(client); |
1335 | ||
1336 | sd_dhcp6_client_detach_event(client); | |
3733eec3 LP |
1337 | |
1338 | free(client->req_opts); | |
8006aa32 | 1339 | free(client->fqdn); |
6b430fdb | 1340 | return mfree(client); |
139b011a PF |
1341 | } |
1342 | ||
0ae0e5cd | 1343 | int sd_dhcp6_client_new(sd_dhcp6_client **ret) { |
4afd3348 | 1344 | _cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL; |
da6fe470 | 1345 | size_t t; |
139b011a PF |
1346 | |
1347 | assert_return(ret, -EINVAL); | |
1348 | ||
1349 | client = new0(sd_dhcp6_client, 1); | |
1350 | if (!client) | |
1351 | return -ENOMEM; | |
1352 | ||
3733eec3 | 1353 | client->n_ref = 1; |
2c1ab8ca | 1354 | client->ia_na.type = SD_DHCP6_OPTION_IA_NA; |
2f8e7633 | 1355 | client->ifindex = -1; |
c806ffb9 ZJS |
1356 | client->fd = -1; |
1357 | ||
da6fe470 | 1358 | client->req_opts_len = ELEMENTSOF(default_req_opts); |
da6fe470 PF |
1359 | client->req_opts = new0(be16_t, client->req_opts_len); |
1360 | if (!client->req_opts) | |
1361 | return -ENOMEM; | |
1362 | ||
1363 | for (t = 0; t < client->req_opts_len; t++) | |
1364 | client->req_opts[t] = htobe16(default_req_opts[t]); | |
1365 | ||
139b011a PF |
1366 | *ret = client; |
1367 | client = NULL; | |
1368 | ||
1369 | return 0; | |
1370 | } |