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