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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; | |
48 | int index; | |
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; | |
ccf86354 | 67 | sd_dhcp6_client_callback_t cb; |
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) { | |
139b011a PF |
118 | assert_return(client, -EINVAL); |
119 | ||
120 | client->cb = cb; | |
121 | client->userdata = userdata; | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
0ae0e5cd | 126 | int sd_dhcp6_client_set_index(sd_dhcp6_client *client, int interface_index) { |
139b011a PF |
127 | assert_return(client, -EINVAL); |
128 | assert_return(interface_index >= -1, -EINVAL); | |
129 | ||
d7c9c21f PF |
130 | assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY); |
131 | ||
139b011a PF |
132 | client->index = interface_index; |
133 | ||
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) { | |
2c1ab8ca BG |
259 | case SD_DHCP6_OPTION_DNS_SERVERS: |
260 | case SD_DHCP6_OPTION_DOMAIN_LIST: | |
261 | case SD_DHCP6_OPTION_SNTP_SERVERS: | |
262 | case SD_DHCP6_OPTION_NTP_SERVER: | |
da6fe470 PF |
263 | break; |
264 | ||
265 | default: | |
266 | return -EINVAL; | |
267 | } | |
268 | ||
269 | for (t = 0; t < client->req_opts_len; t++) | |
270 | if (client->req_opts[t] == htobe16(option)) | |
271 | return -EEXIST; | |
272 | ||
273 | if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated, | |
274 | client->req_opts_len + 1)) | |
275 | return -ENOMEM; | |
276 | ||
277 | client->req_opts[client->req_opts_len++] = htobe16(option); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
ea3b3a75 PF |
282 | int sd_dhcp6_client_get_lease(sd_dhcp6_client *client, sd_dhcp6_lease **ret) { |
283 | assert_return(client, -EINVAL); | |
ea3b3a75 PF |
284 | |
285 | if (!client->lease) | |
286 | return -ENOMSG; | |
287 | ||
3098562c TG |
288 | if (ret) |
289 | *ret = client->lease; | |
ea3b3a75 PF |
290 | |
291 | return 0; | |
292 | } | |
293 | ||
3f0c075f PF |
294 | static void client_notify(sd_dhcp6_client *client, int event) { |
295 | if (client->cb) | |
139b011a | 296 | client->cb(client, event, client->userdata); |
139b011a PF |
297 | } |
298 | ||
f8908727 | 299 | static void client_set_lease(sd_dhcp6_client *client, sd_dhcp6_lease *lease) { |
4e3e6679 PF |
300 | if (client->lease) { |
301 | dhcp6_lease_clear_timers(&client->lease->ia); | |
f8908727 | 302 | sd_dhcp6_lease_unref(client->lease); |
4e3e6679 | 303 | } |
f8908727 TH |
304 | client->lease = lease; |
305 | } | |
306 | ||
307 | static int client_reset(sd_dhcp6_client *client) { | |
308 | assert_return(client, -EINVAL); | |
309 | ||
310 | client_set_lease(client, NULL); | |
4e3e6679 | 311 | |
a9aff361 PF |
312 | client->receive_message = |
313 | sd_event_source_unref(client->receive_message); | |
314 | ||
c806ffb9 | 315 | client->fd = safe_close(client->fd); |
a9aff361 | 316 | |
c3e2adea | 317 | client->transaction_id = 0; |
346e13a2 | 318 | client->transaction_start = 0; |
a9aff361 | 319 | |
f12abb48 PF |
320 | client->ia_na.timeout_t1 = |
321 | sd_event_source_unref(client->ia_na.timeout_t1); | |
322 | client->ia_na.timeout_t2 = | |
323 | sd_event_source_unref(client->ia_na.timeout_t2); | |
324 | ||
d1b0afe3 PF |
325 | client->retransmit_time = 0; |
326 | client->retransmit_count = 0; | |
327 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); | |
328 | client->timeout_resend_expire = | |
329 | sd_event_source_unref(client->timeout_resend_expire); | |
330 | ||
139b011a PF |
331 | client->state = DHCP6_STATE_STOPPED; |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
3f0c075f PF |
336 | static void client_stop(sd_dhcp6_client *client, int error) { |
337 | DHCP6_CLIENT_DONT_DESTROY(client); | |
139b011a | 338 | |
3f0c075f | 339 | assert(client); |
139b011a | 340 | |
3f0c075f PF |
341 | client_notify(client, error); |
342 | ||
343 | client_reset(client); | |
139b011a PF |
344 | } |
345 | ||
346e13a2 | 346 | static int client_send_message(sd_dhcp6_client *client, usec_t time_now) { |
a9aff361 PF |
347 | _cleanup_free_ DHCP6Message *message = NULL; |
348 | struct in6_addr all_servers = | |
349 | IN6ADDR_ALL_DHCP6_RELAY_AGENTS_AND_SERVERS_INIT; | |
350 | size_t len, optlen = 512; | |
351 | uint8_t *opt; | |
352 | int r; | |
346e13a2 PF |
353 | usec_t elapsed_usec; |
354 | be16_t elapsed_time; | |
a9aff361 PF |
355 | |
356 | len = sizeof(DHCP6Message) + optlen; | |
357 | ||
358 | message = malloc0(len); | |
359 | if (!message) | |
360 | return -ENOMEM; | |
361 | ||
362 | opt = (uint8_t *)(message + 1); | |
363 | ||
364 | message->transaction_id = client->transaction_id; | |
365 | ||
366 | switch(client->state) { | |
bbfa43ca PF |
367 | case DHCP6_STATE_INFORMATION_REQUEST: |
368 | message->type = DHCP6_INFORMATION_REQUEST; | |
369 | ||
370 | break; | |
371 | ||
a9aff361 PF |
372 | case DHCP6_STATE_SOLICITATION: |
373 | message->type = DHCP6_SOLICIT; | |
374 | ||
ed6ee219 | 375 | r = dhcp6_option_append(&opt, &optlen, |
2c1ab8ca | 376 | SD_DHCP6_OPTION_RAPID_COMMIT, 0, NULL); |
926695f1 TA |
377 | if (r < 0) |
378 | return r; | |
ed6ee219 | 379 | |
7246333c | 380 | r = dhcp6_option_append_ia(&opt, &optlen, &client->ia_na); |
a9aff361 PF |
381 | if (r < 0) |
382 | return r; | |
383 | ||
7246333c PF |
384 | break; |
385 | ||
386 | case DHCP6_STATE_REQUEST: | |
3dc34fcc PF |
387 | case DHCP6_STATE_RENEW: |
388 | ||
389 | if (client->state == DHCP6_STATE_REQUEST) | |
390 | message->type = DHCP6_REQUEST; | |
391 | else | |
392 | message->type = DHCP6_RENEW; | |
7246333c | 393 | |
2c1ab8ca | 394 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_SERVERID, |
7246333c PF |
395 | client->lease->serverid_len, |
396 | client->lease->serverid); | |
397 | if (r < 0) | |
398 | return r; | |
399 | ||
400 | r = dhcp6_option_append_ia(&opt, &optlen, &client->lease->ia); | |
a9aff361 PF |
401 | if (r < 0) |
402 | return r; | |
403 | ||
404 | break; | |
405 | ||
3dc34fcc PF |
406 | case DHCP6_STATE_REBIND: |
407 | message->type = DHCP6_REBIND; | |
408 | ||
409 | r = dhcp6_option_append_ia(&opt, &optlen, &client->lease->ia); | |
410 | if (r < 0) | |
411 | return r; | |
412 | ||
413 | break; | |
414 | ||
a9aff361 | 415 | case DHCP6_STATE_STOPPED: |
a34b57c0 | 416 | case DHCP6_STATE_BOUND: |
a9aff361 PF |
417 | return -EINVAL; |
418 | } | |
419 | ||
2c1ab8ca | 420 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_ORO, |
da6fe470 PF |
421 | client->req_opts_len * sizeof(be16_t), |
422 | client->req_opts); | |
423 | if (r < 0) | |
424 | return r; | |
425 | ||
cc22955c | 426 | assert (client->duid_len); |
2c1ab8ca | 427 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_CLIENTID, |
66eac120 | 428 | client->duid_len, &client->duid); |
7246333c PF |
429 | if (r < 0) |
430 | return r; | |
431 | ||
346e13a2 PF |
432 | elapsed_usec = time_now - client->transaction_start; |
433 | if (elapsed_usec < 0xffff * USEC_PER_MSEC * 10) | |
434 | elapsed_time = htobe16(elapsed_usec / USEC_PER_MSEC / 10); | |
435 | else | |
436 | elapsed_time = 0xffff; | |
437 | ||
2c1ab8ca | 438 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_ELAPSED_TIME, |
346e13a2 PF |
439 | sizeof(elapsed_time), &elapsed_time); |
440 | if (r < 0) | |
441 | return r; | |
442 | ||
a9aff361 PF |
443 | r = dhcp6_network_send_udp_socket(client->fd, &all_servers, message, |
444 | len - optlen); | |
445 | if (r < 0) | |
446 | return r; | |
447 | ||
448 | log_dhcp6_client(client, "Sent %s", | |
449 | dhcp6_message_type_to_string(message->type)); | |
450 | ||
451 | return 0; | |
452 | } | |
453 | ||
4b558378 | 454 | static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) { |
a34b57c0 PF |
455 | sd_dhcp6_client *client = userdata; |
456 | ||
457 | assert_return(s, -EINVAL); | |
458 | assert_return(client, -EINVAL); | |
459 | assert_return(client->lease, -EINVAL); | |
460 | ||
461 | client->lease->ia.timeout_t2 = | |
462 | sd_event_source_unref(client->lease->ia.timeout_t2); | |
463 | ||
464 | log_dhcp6_client(client, "Timeout T2"); | |
465 | ||
3dc34fcc PF |
466 | client_start(client, DHCP6_STATE_REBIND); |
467 | ||
a34b57c0 PF |
468 | return 0; |
469 | } | |
470 | ||
4b558378 | 471 | static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) { |
a34b57c0 PF |
472 | sd_dhcp6_client *client = userdata; |
473 | ||
474 | assert_return(s, -EINVAL); | |
475 | assert_return(client, -EINVAL); | |
476 | assert_return(client->lease, -EINVAL); | |
477 | ||
478 | client->lease->ia.timeout_t1 = | |
479 | sd_event_source_unref(client->lease->ia.timeout_t1); | |
480 | ||
481 | log_dhcp6_client(client, "Timeout T1"); | |
482 | ||
3dc34fcc PF |
483 | client_start(client, DHCP6_STATE_RENEW); |
484 | ||
a34b57c0 PF |
485 | return 0; |
486 | } | |
487 | ||
4b558378 | 488 | static int client_timeout_resend_expire(sd_event_source *s, uint64_t usec, void *userdata) { |
d1b0afe3 | 489 | sd_dhcp6_client *client = userdata; |
3dc34fcc PF |
490 | DHCP6_CLIENT_DONT_DESTROY(client); |
491 | enum DHCP6State state; | |
d1b0afe3 PF |
492 | |
493 | assert(s); | |
494 | assert(client); | |
495 | assert(client->event); | |
496 | ||
3dc34fcc PF |
497 | state = client->state; |
498 | ||
10c9ce61 | 499 | client_stop(client, SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE); |
d1b0afe3 | 500 | |
3dc34fcc PF |
501 | /* RFC 3315, section 18.1.4., says that "...the client may choose to |
502 | use a Solicit message to locate a new DHCP server..." */ | |
503 | if (state == DHCP6_STATE_REBIND) | |
504 | client_start(client, DHCP6_STATE_SOLICITATION); | |
505 | ||
d1b0afe3 PF |
506 | return 0; |
507 | } | |
508 | ||
509 | static usec_t client_timeout_compute_random(usec_t val) { | |
510 | return val - val / 10 + | |
511 | (random_u32() % (2 * USEC_PER_SEC)) * val / 10 / USEC_PER_SEC; | |
512 | } | |
513 | ||
4b558378 | 514 | static int client_timeout_resend(sd_event_source *s, uint64_t usec, void *userdata) { |
d1b0afe3 PF |
515 | int r = 0; |
516 | sd_dhcp6_client *client = userdata; | |
4b4923e6 | 517 | usec_t time_now, init_retransmit_time = 0, max_retransmit_time = 0; |
5e913450 | 518 | usec_t max_retransmit_duration = 0; |
513a6fa8 | 519 | uint8_t max_retransmit_count = 0; |
d1b0afe3 | 520 | char time_string[FORMAT_TIMESPAN_MAX]; |
3dc34fcc | 521 | uint32_t expire = 0; |
d1b0afe3 PF |
522 | |
523 | assert(s); | |
524 | assert(client); | |
525 | assert(client->event); | |
526 | ||
527 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); | |
528 | ||
529 | switch (client->state) { | |
bbfa43ca PF |
530 | case DHCP6_STATE_INFORMATION_REQUEST: |
531 | init_retransmit_time = DHCP6_INF_TIMEOUT; | |
532 | max_retransmit_time = DHCP6_INF_MAX_RT; | |
533 | ||
534 | break; | |
535 | ||
d1b0afe3 | 536 | case DHCP6_STATE_SOLICITATION: |
7246333c PF |
537 | |
538 | if (client->retransmit_count && client->lease) { | |
539 | client_start(client, DHCP6_STATE_REQUEST); | |
540 | return 0; | |
541 | } | |
542 | ||
d1b0afe3 PF |
543 | init_retransmit_time = DHCP6_SOL_TIMEOUT; |
544 | max_retransmit_time = DHCP6_SOL_MAX_RT; | |
d1b0afe3 PF |
545 | |
546 | break; | |
547 | ||
7246333c PF |
548 | case DHCP6_STATE_REQUEST: |
549 | init_retransmit_time = DHCP6_REQ_TIMEOUT; | |
550 | max_retransmit_time = DHCP6_REQ_MAX_RT; | |
551 | max_retransmit_count = DHCP6_REQ_MAX_RC; | |
7246333c PF |
552 | |
553 | break; | |
554 | ||
3dc34fcc PF |
555 | case DHCP6_STATE_RENEW: |
556 | init_retransmit_time = DHCP6_REN_TIMEOUT; | |
557 | max_retransmit_time = DHCP6_REN_MAX_RT; | |
3dc34fcc PF |
558 | |
559 | /* RFC 3315, section 18.1.3. says max retransmit duration will | |
560 | be the remaining time until T2. Instead of setting MRD, | |
561 | wait for T2 to trigger with the same end result */ | |
3dc34fcc PF |
562 | |
563 | break; | |
564 | ||
565 | case DHCP6_STATE_REBIND: | |
566 | init_retransmit_time = DHCP6_REB_TIMEOUT; | |
567 | max_retransmit_time = DHCP6_REB_MAX_RT; | |
3dc34fcc PF |
568 | |
569 | if (!client->timeout_resend_expire) { | |
570 | r = dhcp6_lease_ia_rebind_expire(&client->lease->ia, | |
571 | &expire); | |
572 | if (r < 0) { | |
573 | client_stop(client, r); | |
574 | return 0; | |
575 | } | |
576 | max_retransmit_duration = expire * USEC_PER_SEC; | |
577 | } | |
578 | ||
579 | break; | |
580 | ||
d1b0afe3 | 581 | case DHCP6_STATE_STOPPED: |
a34b57c0 | 582 | case DHCP6_STATE_BOUND: |
d1b0afe3 PF |
583 | return 0; |
584 | } | |
585 | ||
586 | if (max_retransmit_count && | |
587 | client->retransmit_count >= max_retransmit_count) { | |
10c9ce61 | 588 | client_stop(client, SD_DHCP6_CLIENT_EVENT_RETRANS_MAX); |
d1b0afe3 PF |
589 | return 0; |
590 | } | |
591 | ||
fa94c34b | 592 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
d1b0afe3 PF |
593 | if (r < 0) |
594 | goto error; | |
595 | ||
346e13a2 PF |
596 | r = client_send_message(client, time_now); |
597 | if (r >= 0) | |
598 | client->retransmit_count++; | |
599 | ||
d1b0afe3 PF |
600 | if (!client->retransmit_time) { |
601 | client->retransmit_time = | |
602 | client_timeout_compute_random(init_retransmit_time); | |
a9aff361 PF |
603 | |
604 | if (client->state == DHCP6_STATE_SOLICITATION) | |
605 | client->retransmit_time += init_retransmit_time / 10; | |
606 | ||
d1b0afe3 PF |
607 | } else { |
608 | if (max_retransmit_time && | |
609 | client->retransmit_time > max_retransmit_time / 2) | |
610 | client->retransmit_time = client_timeout_compute_random(max_retransmit_time); | |
611 | else | |
612 | client->retransmit_time += client_timeout_compute_random(client->retransmit_time); | |
613 | } | |
614 | ||
615 | log_dhcp6_client(client, "Next retransmission in %s", | |
ed19c567 | 616 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, client->retransmit_time, USEC_PER_SEC)); |
d1b0afe3 PF |
617 | |
618 | r = sd_event_add_time(client->event, &client->timeout_resend, | |
fa94c34b | 619 | clock_boottime_or_monotonic(), |
d1b0afe3 PF |
620 | time_now + client->retransmit_time, |
621 | 10 * USEC_PER_MSEC, client_timeout_resend, | |
622 | client); | |
623 | if (r < 0) | |
624 | goto error; | |
625 | ||
626 | r = sd_event_source_set_priority(client->timeout_resend, | |
627 | client->event_priority); | |
628 | if (r < 0) | |
629 | goto error; | |
630 | ||
356779df | 631 | r = sd_event_source_set_description(client->timeout_resend, "dhcp6-resend-timer"); |
9021bb9f TG |
632 | if (r < 0) |
633 | goto error; | |
634 | ||
d1b0afe3 PF |
635 | if (max_retransmit_duration && !client->timeout_resend_expire) { |
636 | ||
637 | log_dhcp6_client(client, "Max retransmission duration %"PRIu64" secs", | |
638 | max_retransmit_duration / USEC_PER_SEC); | |
639 | ||
640 | r = sd_event_add_time(client->event, | |
641 | &client->timeout_resend_expire, | |
fa94c34b | 642 | clock_boottime_or_monotonic(), |
d1b0afe3 PF |
643 | time_now + max_retransmit_duration, |
644 | USEC_PER_SEC, | |
645 | client_timeout_resend_expire, client); | |
646 | if (r < 0) | |
647 | goto error; | |
648 | ||
649 | r = sd_event_source_set_priority(client->timeout_resend_expire, | |
650 | client->event_priority); | |
651 | if (r < 0) | |
652 | goto error; | |
9021bb9f | 653 | |
356779df | 654 | r = sd_event_source_set_description(client->timeout_resend_expire, "dhcp6-resend-expire-timer"); |
9021bb9f TG |
655 | if (r < 0) |
656 | goto error; | |
d1b0afe3 PF |
657 | } |
658 | ||
659 | error: | |
660 | if (r < 0) | |
661 | client_stop(client, r); | |
662 | ||
663 | return 0; | |
664 | } | |
665 | ||
f12abb48 | 666 | static int client_ensure_iaid(sd_dhcp6_client *client) { |
cfb5b380 | 667 | int r; |
f12abb48 PF |
668 | |
669 | assert(client); | |
670 | ||
671 | if (client->ia_na.id) | |
672 | return 0; | |
673 | ||
cfb5b380 TG |
674 | r = dhcp_identifier_set_iaid(client->index, client->mac_addr, client->mac_addr_len, &client->ia_na.id); |
675 | if (r < 0) | |
676 | return r; | |
f12abb48 PF |
677 | |
678 | return 0; | |
679 | } | |
680 | ||
4b558378 ZJS |
681 | static int client_parse_message( |
682 | sd_dhcp6_client *client, | |
683 | DHCP6Message *message, | |
684 | size_t len, | |
685 | sd_dhcp6_lease *lease) { | |
631bbe71 | 686 | int r; |
44481a8b | 687 | uint8_t *optval, *option, *id = NULL; |
631bbe71 PF |
688 | uint16_t optcode, status; |
689 | size_t optlen, id_len; | |
690 | bool clientid = false; | |
691 | be32_t iaid_lease; | |
692 | ||
44481a8b ZJS |
693 | option = (uint8_t *)message + sizeof(DHCP6Message); |
694 | len -= sizeof(DHCP6Message); | |
695 | ||
631bbe71 PF |
696 | while ((r = dhcp6_option_parse(&option, &len, &optcode, &optlen, |
697 | &optval)) >= 0) { | |
698 | switch (optcode) { | |
2c1ab8ca | 699 | case SD_DHCP6_OPTION_CLIENTID: |
631bbe71 PF |
700 | if (clientid) { |
701 | log_dhcp6_client(client, "%s contains multiple clientids", | |
702 | dhcp6_message_type_to_string(message->type)); | |
703 | return -EINVAL; | |
704 | } | |
705 | ||
66eac120 | 706 | if (optlen != client->duid_len || |
631bbe71 PF |
707 | memcmp(&client->duid, optval, optlen) != 0) { |
708 | log_dhcp6_client(client, "%s DUID does not match", | |
709 | dhcp6_message_type_to_string(message->type)); | |
710 | ||
711 | return -EINVAL; | |
712 | } | |
713 | clientid = true; | |
714 | ||
715 | break; | |
716 | ||
2c1ab8ca | 717 | case SD_DHCP6_OPTION_SERVERID: |
631bbe71 PF |
718 | r = dhcp6_lease_get_serverid(lease, &id, &id_len); |
719 | if (r >= 0 && id) { | |
720 | log_dhcp6_client(client, "%s contains multiple serverids", | |
721 | dhcp6_message_type_to_string(message->type)); | |
722 | return -EINVAL; | |
723 | } | |
724 | ||
725 | r = dhcp6_lease_set_serverid(lease, optval, optlen); | |
726 | if (r < 0) | |
727 | return r; | |
728 | ||
729 | break; | |
730 | ||
2c1ab8ca | 731 | case SD_DHCP6_OPTION_PREFERENCE: |
631bbe71 PF |
732 | if (optlen != 1) |
733 | return -EINVAL; | |
734 | ||
735 | r = dhcp6_lease_set_preference(lease, *optval); | |
736 | if (r < 0) | |
737 | return r; | |
738 | ||
739 | break; | |
740 | ||
2c1ab8ca | 741 | case SD_DHCP6_OPTION_STATUS_CODE: |
631bbe71 PF |
742 | if (optlen < 2) |
743 | return -EINVAL; | |
744 | ||
745 | status = optval[0] << 8 | optval[1]; | |
746 | if (status) { | |
747 | log_dhcp6_client(client, "%s Status %s", | |
748 | dhcp6_message_type_to_string(message->type), | |
749 | dhcp6_message_status_to_string(status)); | |
750 | return -EINVAL; | |
751 | } | |
752 | ||
753 | break; | |
754 | ||
2c1ab8ca | 755 | case SD_DHCP6_OPTION_IA_NA: |
bbfa43ca PF |
756 | if (client->state == DHCP6_STATE_INFORMATION_REQUEST) { |
757 | log_dhcp6_client(client, "Information request ignoring IA NA option"); | |
758 | ||
759 | break; | |
760 | } | |
761 | ||
631bbe71 PF |
762 | r = dhcp6_option_parse_ia(&optval, &optlen, optcode, |
763 | &lease->ia); | |
764 | if (r < 0 && r != -ENOMSG) | |
765 | return r; | |
766 | ||
767 | r = dhcp6_lease_get_iaid(lease, &iaid_lease); | |
768 | if (r < 0) | |
769 | return r; | |
770 | ||
771 | if (client->ia_na.id != iaid_lease) { | |
772 | log_dhcp6_client(client, "%s has wrong IAID", | |
773 | dhcp6_message_type_to_string(message->type)); | |
774 | return -EINVAL; | |
775 | } | |
776 | ||
777 | break; | |
ed6ee219 | 778 | |
2c1ab8ca | 779 | case SD_DHCP6_OPTION_RAPID_COMMIT: |
ed6ee219 PF |
780 | r = dhcp6_lease_set_rapid_commit(lease); |
781 | if (r < 0) | |
782 | return r; | |
783 | ||
784 | break; | |
7bd8e95d | 785 | |
2c1ab8ca | 786 | case SD_DHCP6_OPTION_DNS_SERVERS: |
7bd8e95d PF |
787 | r = dhcp6_lease_set_dns(lease, optval, optlen); |
788 | if (r < 0) | |
789 | return r; | |
790 | ||
791 | break; | |
5da1b97f | 792 | |
2c1ab8ca | 793 | case SD_DHCP6_OPTION_DOMAIN_LIST: |
5da1b97f PF |
794 | r = dhcp6_lease_set_domains(lease, optval, optlen); |
795 | if (r < 0) | |
796 | return r; | |
797 | ||
798 | break; | |
799 | ||
2c1ab8ca | 800 | case SD_DHCP6_OPTION_NTP_SERVER: |
6599680e PF |
801 | r = dhcp6_lease_set_ntp(lease, optval, optlen); |
802 | if (r < 0) | |
803 | return r; | |
804 | ||
805 | break; | |
41e4615d | 806 | |
2c1ab8ca | 807 | case SD_DHCP6_OPTION_SNTP_SERVERS: |
41e4615d PF |
808 | r = dhcp6_lease_set_sntp(lease, optval, optlen); |
809 | if (r < 0) | |
810 | return r; | |
811 | ||
812 | break; | |
631bbe71 | 813 | } |
6599680e | 814 | |
631bbe71 PF |
815 | } |
816 | ||
c47e8936 PF |
817 | if (r == -ENOMSG) |
818 | r = 0; | |
819 | ||
820 | if (r < 0 || !clientid) { | |
631bbe71 PF |
821 | log_dhcp6_client(client, "%s has incomplete options", |
822 | dhcp6_message_type_to_string(message->type)); | |
823 | return -EINVAL; | |
824 | } | |
825 | ||
bbfa43ca PF |
826 | if (client->state != DHCP6_STATE_INFORMATION_REQUEST) { |
827 | r = dhcp6_lease_get_serverid(lease, &id, &id_len); | |
828 | if (r < 0) | |
829 | log_dhcp6_client(client, "%s has no server id", | |
830 | dhcp6_message_type_to_string(message->type)); | |
831 | } | |
631bbe71 PF |
832 | |
833 | return r; | |
834 | } | |
835 | ||
0ae0e5cd | 836 | static int client_receive_reply(sd_dhcp6_client *client, DHCP6Message *reply, size_t len) { |
a34b57c0 | 837 | int r; |
4afd3348 | 838 | _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; |
ed6ee219 | 839 | bool rapid_commit; |
a34b57c0 PF |
840 | |
841 | if (reply->type != DHCP6_REPLY) | |
ed6ee219 | 842 | return 0; |
a34b57c0 PF |
843 | |
844 | r = dhcp6_lease_new(&lease); | |
845 | if (r < 0) | |
846 | return -ENOMEM; | |
847 | ||
848 | r = client_parse_message(client, reply, len, lease); | |
849 | if (r < 0) | |
850 | return r; | |
851 | ||
ed6ee219 PF |
852 | if (client->state == DHCP6_STATE_SOLICITATION) { |
853 | r = dhcp6_lease_get_rapid_commit(lease, &rapid_commit); | |
854 | if (r < 0) | |
855 | return r; | |
856 | ||
857 | if (!rapid_commit) | |
858 | return 0; | |
859 | } | |
860 | ||
f8908727 | 861 | client_set_lease(client, lease); |
9d89d1ae | 862 | lease = NULL; |
a34b57c0 PF |
863 | |
864 | return DHCP6_STATE_BOUND; | |
865 | } | |
866 | ||
0ae0e5cd | 867 | static int client_receive_advertise(sd_dhcp6_client *client, DHCP6Message *advertise, size_t len) { |
631bbe71 | 868 | int r; |
4afd3348 | 869 | _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; |
631bbe71 PF |
870 | uint8_t pref_advertise = 0, pref_lease = 0; |
871 | ||
872 | if (advertise->type != DHCP6_ADVERTISE) | |
ed6ee219 | 873 | return 0; |
631bbe71 PF |
874 | |
875 | r = dhcp6_lease_new(&lease); | |
876 | if (r < 0) | |
877 | return r; | |
878 | ||
879 | r = client_parse_message(client, advertise, len, lease); | |
880 | if (r < 0) | |
881 | return r; | |
882 | ||
883 | r = dhcp6_lease_get_preference(lease, &pref_advertise); | |
884 | if (r < 0) | |
885 | return r; | |
886 | ||
887 | r = dhcp6_lease_get_preference(client->lease, &pref_lease); | |
bbfa43ca PF |
888 | |
889 | if (r < 0 || pref_advertise > pref_lease) { | |
f8908727 | 890 | client_set_lease(client, lease); |
631bbe71 PF |
891 | lease = NULL; |
892 | r = 0; | |
893 | } | |
894 | ||
7246333c PF |
895 | if (pref_advertise == 255 || client->retransmit_count > 1) |
896 | r = DHCP6_STATE_REQUEST; | |
897 | ||
631bbe71 PF |
898 | return r; |
899 | } | |
900 | ||
0ae0e5cd | 901 | static int client_receive_message(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
631bbe71 | 902 | sd_dhcp6_client *client = userdata; |
3f0c075f | 903 | DHCP6_CLIENT_DONT_DESTROY(client); |
0d43d2fc | 904 | _cleanup_free_ DHCP6Message *message = NULL; |
4edc2c9b LP |
905 | ssize_t buflen, len; |
906 | int r = 0; | |
631bbe71 PF |
907 | |
908 | assert(s); | |
909 | assert(client); | |
910 | assert(client->event); | |
911 | ||
4edc2c9b LP |
912 | buflen = next_datagram_size_fd(fd); |
913 | if (buflen < 0) | |
914 | return buflen; | |
631bbe71 | 915 | |
0d43d2fc | 916 | message = malloc(buflen); |
631bbe71 PF |
917 | if (!message) |
918 | return -ENOMEM; | |
919 | ||
920 | len = read(fd, message, buflen); | |
0d43d2fc TG |
921 | if (len < 0) { |
922 | if (errno == EAGAIN || errno == EINTR) | |
923 | return 0; | |
924 | ||
925 | log_dhcp6_client(client, "Could not receive message from UDP socket: %m"); | |
926 | ||
927 | return -errno; | |
928 | } else if ((size_t)len < sizeof(DHCP6Message)) | |
631bbe71 | 929 | return 0; |
631bbe71 PF |
930 | |
931 | switch(message->type) { | |
932 | case DHCP6_SOLICIT: | |
933 | case DHCP6_REQUEST: | |
934 | case DHCP6_CONFIRM: | |
935 | case DHCP6_RENEW: | |
936 | case DHCP6_REBIND: | |
937 | case DHCP6_RELEASE: | |
938 | case DHCP6_DECLINE: | |
939 | case DHCP6_INFORMATION_REQUEST: | |
940 | case DHCP6_RELAY_FORW: | |
941 | case DHCP6_RELAY_REPL: | |
942 | return 0; | |
943 | ||
944 | case DHCP6_ADVERTISE: | |
945 | case DHCP6_REPLY: | |
946 | case DHCP6_RECONFIGURE: | |
947 | break; | |
948 | ||
949 | default: | |
950 | log_dhcp6_client(client, "unknown message type %d", | |
951 | message->type); | |
952 | return 0; | |
953 | } | |
954 | ||
955 | if (client->transaction_id != (message->transaction_id & | |
956 | htobe32(0x00ffffff))) | |
957 | return 0; | |
958 | ||
959 | switch (client->state) { | |
bbfa43ca PF |
960 | case DHCP6_STATE_INFORMATION_REQUEST: |
961 | r = client_receive_reply(client, message, len); | |
962 | if (r < 0) | |
963 | return 0; | |
964 | ||
10c9ce61 | 965 | client_notify(client, SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST); |
bbfa43ca PF |
966 | |
967 | client_start(client, DHCP6_STATE_STOPPED); | |
968 | ||
969 | break; | |
970 | ||
631bbe71 PF |
971 | case DHCP6_STATE_SOLICITATION: |
972 | r = client_receive_advertise(client, message, len); | |
973 | ||
ed6ee219 | 974 | if (r == DHCP6_STATE_REQUEST) { |
7246333c PF |
975 | client_start(client, r); |
976 | ||
ed6ee219 PF |
977 | break; |
978 | } | |
631bbe71 | 979 | |
ed6ee219 | 980 | /* fall through for Soliciation Rapid Commit option check */ |
7246333c | 981 | case DHCP6_STATE_REQUEST: |
3dc34fcc PF |
982 | case DHCP6_STATE_RENEW: |
983 | case DHCP6_STATE_REBIND: | |
984 | ||
a34b57c0 PF |
985 | r = client_receive_reply(client, message, len); |
986 | if (r < 0) | |
987 | return 0; | |
988 | ||
989 | if (r == DHCP6_STATE_BOUND) { | |
990 | ||
991 | r = client_start(client, DHCP6_STATE_BOUND); | |
992 | if (r < 0) { | |
993 | client_stop(client, r); | |
994 | return 0; | |
995 | } | |
996 | ||
10c9ce61 | 997 | client_notify(client, SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE); |
a34b57c0 PF |
998 | } |
999 | ||
1000 | break; | |
1001 | ||
1002 | case DHCP6_STATE_BOUND: | |
1003 | ||
1004 | break; | |
1005 | ||
631bbe71 | 1006 | case DHCP6_STATE_STOPPED: |
631bbe71 PF |
1007 | return 0; |
1008 | } | |
1009 | ||
1010 | if (r >= 0) { | |
1011 | log_dhcp6_client(client, "Recv %s", | |
1012 | dhcp6_message_type_to_string(message->type)); | |
1013 | } | |
1014 | ||
a9aff361 PF |
1015 | return 0; |
1016 | } | |
1017 | ||
0ae0e5cd | 1018 | static int client_start(sd_dhcp6_client *client, enum DHCP6State state) { |
f12abb48 | 1019 | int r; |
a34b57c0 PF |
1020 | usec_t timeout, time_now; |
1021 | char time_string[FORMAT_TIMESPAN_MAX]; | |
f12abb48 PF |
1022 | |
1023 | assert_return(client, -EINVAL); | |
1024 | assert_return(client->event, -EINVAL); | |
1025 | assert_return(client->index > 0, -EINVAL); | |
c3e2adea | 1026 | assert_return(client->state != state, -EINVAL); |
f12abb48 | 1027 | |
c3e2adea PF |
1028 | client->timeout_resend_expire = |
1029 | sd_event_source_unref(client->timeout_resend_expire); | |
1030 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); | |
1031 | client->retransmit_time = 0; | |
1032 | client->retransmit_count = 0; | |
f12abb48 | 1033 | |
38a03f06 LP |
1034 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
1035 | if (r < 0) | |
1036 | return r; | |
346e13a2 | 1037 | |
c3e2adea PF |
1038 | switch (state) { |
1039 | case DHCP6_STATE_STOPPED: | |
bbfa43ca PF |
1040 | if (client->state == DHCP6_STATE_INFORMATION_REQUEST) { |
1041 | client->state = DHCP6_STATE_STOPPED; | |
a9aff361 | 1042 | |
bbfa43ca PF |
1043 | return 0; |
1044 | } | |
9021bb9f | 1045 | |
bbfa43ca PF |
1046 | /* fall through */ |
1047 | case DHCP6_STATE_SOLICITATION: | |
c3e2adea PF |
1048 | client->state = DHCP6_STATE_SOLICITATION; |
1049 | ||
7246333c PF |
1050 | break; |
1051 | ||
bbfa43ca | 1052 | case DHCP6_STATE_INFORMATION_REQUEST: |
7246333c | 1053 | case DHCP6_STATE_REQUEST: |
3dc34fcc PF |
1054 | case DHCP6_STATE_RENEW: |
1055 | case DHCP6_STATE_REBIND: | |
a34b57c0 | 1056 | |
7246333c PF |
1057 | client->state = state; |
1058 | ||
c3e2adea | 1059 | break; |
a34b57c0 PF |
1060 | |
1061 | case DHCP6_STATE_BOUND: | |
1062 | ||
a34b57c0 PF |
1063 | if (client->lease->ia.lifetime_t1 == 0xffffffff || |
1064 | client->lease->ia.lifetime_t2 == 0xffffffff) { | |
1065 | ||
1066 | log_dhcp6_client(client, "infinite T1 0x%08x or T2 0x%08x", | |
1067 | be32toh(client->lease->ia.lifetime_t1), | |
1068 | be32toh(client->lease->ia.lifetime_t2)); | |
1069 | ||
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | timeout = client_timeout_compute_random(be32toh(client->lease->ia.lifetime_t1) * USEC_PER_SEC); | |
1074 | ||
1075 | log_dhcp6_client(client, "T1 expires in %s", | |
ed19c567 | 1076 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, timeout, USEC_PER_SEC)); |
a34b57c0 PF |
1077 | |
1078 | r = sd_event_add_time(client->event, | |
1079 | &client->lease->ia.timeout_t1, | |
fa94c34b | 1080 | clock_boottime_or_monotonic(), time_now + timeout, |
a34b57c0 PF |
1081 | 10 * USEC_PER_SEC, client_timeout_t1, |
1082 | client); | |
1083 | if (r < 0) | |
1084 | return r; | |
1085 | ||
1086 | r = sd_event_source_set_priority(client->lease->ia.timeout_t1, | |
1087 | client->event_priority); | |
1088 | if (r < 0) | |
1089 | return r; | |
1090 | ||
356779df | 1091 | r = sd_event_source_set_description(client->lease->ia.timeout_t1, "dhcp6-t1-timeout"); |
9021bb9f TG |
1092 | if (r < 0) |
1093 | return r; | |
1094 | ||
a34b57c0 PF |
1095 | timeout = client_timeout_compute_random(be32toh(client->lease->ia.lifetime_t2) * USEC_PER_SEC); |
1096 | ||
1097 | log_dhcp6_client(client, "T2 expires in %s", | |
ed19c567 | 1098 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, timeout, USEC_PER_SEC)); |
a34b57c0 PF |
1099 | |
1100 | r = sd_event_add_time(client->event, | |
1101 | &client->lease->ia.timeout_t2, | |
fa94c34b | 1102 | clock_boottime_or_monotonic(), time_now + timeout, |
a34b57c0 PF |
1103 | 10 * USEC_PER_SEC, client_timeout_t2, |
1104 | client); | |
1105 | if (r < 0) | |
1106 | return r; | |
1107 | ||
1108 | r = sd_event_source_set_priority(client->lease->ia.timeout_t2, | |
1109 | client->event_priority); | |
1110 | if (r < 0) | |
1111 | return r; | |
1112 | ||
356779df | 1113 | r = sd_event_source_set_description(client->lease->ia.timeout_t2, "dhcp6-t2-timeout"); |
9021bb9f TG |
1114 | if (r < 0) |
1115 | return r; | |
1116 | ||
3dc34fcc PF |
1117 | client->state = state; |
1118 | ||
a34b57c0 | 1119 | return 0; |
c3e2adea | 1120 | } |
a9aff361 | 1121 | |
c3e2adea | 1122 | client->transaction_id = random_u32() & htobe32(0x00ffffff); |
346e13a2 | 1123 | client->transaction_start = time_now; |
d1b0afe3 PF |
1124 | |
1125 | r = sd_event_add_time(client->event, &client->timeout_resend, | |
fa94c34b | 1126 | clock_boottime_or_monotonic(), 0, 0, client_timeout_resend, |
d1b0afe3 PF |
1127 | client); |
1128 | if (r < 0) | |
1129 | return r; | |
1130 | ||
1131 | r = sd_event_source_set_priority(client->timeout_resend, | |
1132 | client->event_priority); | |
1133 | if (r < 0) | |
1134 | return r; | |
1135 | ||
356779df | 1136 | r = sd_event_source_set_description(client->timeout_resend, "dhcp6-resend-timeout"); |
9021bb9f TG |
1137 | if (r < 0) |
1138 | return r; | |
1139 | ||
f12abb48 PF |
1140 | return 0; |
1141 | } | |
1142 | ||
0ae0e5cd | 1143 | int sd_dhcp6_client_stop(sd_dhcp6_client *client) { |
f667c150 TG |
1144 | assert_return(client, -EINVAL); |
1145 | ||
10c9ce61 | 1146 | client_stop(client, SD_DHCP6_CLIENT_EVENT_STOP); |
139b011a PF |
1147 | |
1148 | return 0; | |
1149 | } | |
1150 | ||
f667c150 TG |
1151 | int sd_dhcp6_client_is_running(sd_dhcp6_client *client) { |
1152 | assert_return(client, -EINVAL); | |
1153 | ||
1154 | return client->state != DHCP6_STATE_STOPPED; | |
1155 | } | |
1156 | ||
0ae0e5cd | 1157 | int sd_dhcp6_client_start(sd_dhcp6_client *client) { |
139b011a | 1158 | int r = 0; |
bbfa43ca | 1159 | enum DHCP6State state = DHCP6_STATE_SOLICITATION; |
139b011a PF |
1160 | |
1161 | assert_return(client, -EINVAL); | |
1162 | assert_return(client->event, -EINVAL); | |
1163 | assert_return(client->index > 0, -EINVAL); | |
c601ebf7 | 1164 | assert_return(in_addr_is_link_local(AF_INET6, (const union in_addr_union *) &client->local_address) > 0, -EINVAL); |
139b011a | 1165 | |
d7c9c21f | 1166 | if (!IN_SET(client->state, DHCP6_STATE_STOPPED)) |
63348d13 | 1167 | return -EBUSY; |
d7c9c21f | 1168 | |
c806ffb9 | 1169 | r = client_reset(client); |
f12abb48 PF |
1170 | if (r < 0) |
1171 | return r; | |
1172 | ||
bbfa43ca PF |
1173 | r = client_ensure_iaid(client); |
1174 | if (r < 0) | |
1175 | return r; | |
1176 | ||
cc22955c TH |
1177 | r = client_ensure_duid(client); |
1178 | if (r < 0) | |
1179 | return r; | |
1180 | ||
c601ebf7 | 1181 | r = dhcp6_network_bind_udp_socket(client->index, &client->local_address); |
bbfa43ca PF |
1182 | if (r < 0) |
1183 | return r; | |
1184 | ||
1185 | client->fd = r; | |
1186 | ||
1187 | r = sd_event_add_io(client->event, &client->receive_message, | |
1188 | client->fd, EPOLLIN, client_receive_message, | |
1189 | client); | |
1190 | if (r < 0) | |
1191 | goto error; | |
1192 | ||
1193 | r = sd_event_source_set_priority(client->receive_message, | |
1194 | client->event_priority); | |
1195 | if (r < 0) | |
1196 | goto error; | |
1197 | ||
1198 | r = sd_event_source_set_description(client->receive_message, | |
483d099e | 1199 | "dhcp6-receive-message"); |
bbfa43ca PF |
1200 | if (r < 0) |
1201 | goto error; | |
1202 | ||
1203 | if (client->information_request) | |
1204 | state = DHCP6_STATE_INFORMATION_REQUEST; | |
1205 | ||
1206 | log_dhcp6_client(client, "Started in %s mode", | |
483d099e ZJS |
1207 | client->information_request? "Information request": |
1208 | "Managed"); | |
bbfa43ca PF |
1209 | |
1210 | return client_start(client, state); | |
1211 | ||
1212 | error: | |
1213 | client_reset(client); | |
1214 | return r; | |
139b011a PF |
1215 | } |
1216 | ||
32d20645 | 1217 | int sd_dhcp6_client_attach_event(sd_dhcp6_client *client, sd_event *event, int64_t priority) { |
139b011a PF |
1218 | int r; |
1219 | ||
1220 | assert_return(client, -EINVAL); | |
1221 | assert_return(!client->event, -EBUSY); | |
1222 | ||
1223 | if (event) | |
1224 | client->event = sd_event_ref(event); | |
1225 | else { | |
1226 | r = sd_event_default(&client->event); | |
1227 | if (r < 0) | |
1228 | return 0; | |
1229 | } | |
1230 | ||
1231 | client->event_priority = priority; | |
1232 | ||
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | int sd_dhcp6_client_detach_event(sd_dhcp6_client *client) { | |
1237 | assert_return(client, -EINVAL); | |
1238 | ||
1239 | client->event = sd_event_unref(client->event); | |
1240 | ||
1241 | return 0; | |
1242 | } | |
1243 | ||
1244 | sd_event *sd_dhcp6_client_get_event(sd_dhcp6_client *client) { | |
1245 | if (!client) | |
1246 | return NULL; | |
1247 | ||
1248 | return client->event; | |
1249 | } | |
1250 | ||
1251 | sd_dhcp6_client *sd_dhcp6_client_ref(sd_dhcp6_client *client) { | |
3733eec3 LP |
1252 | |
1253 | if (!client) | |
1254 | return NULL; | |
1255 | ||
1256 | assert(client->n_ref >= 1); | |
1257 | client->n_ref++; | |
139b011a PF |
1258 | |
1259 | return client; | |
1260 | } | |
1261 | ||
1262 | sd_dhcp6_client *sd_dhcp6_client_unref(sd_dhcp6_client *client) { | |
139b011a | 1263 | |
3733eec3 LP |
1264 | if (!client) |
1265 | return NULL; | |
139b011a | 1266 | |
3733eec3 LP |
1267 | assert(client->n_ref >= 1); |
1268 | client->n_ref--; | |
139b011a | 1269 | |
3733eec3 | 1270 | if (client->n_ref > 0) |
139b011a | 1271 | return NULL; |
139b011a | 1272 | |
3733eec3 LP |
1273 | client_reset(client); |
1274 | ||
1275 | sd_dhcp6_client_detach_event(client); | |
3733eec3 LP |
1276 | |
1277 | free(client->req_opts); | |
1278 | free(client); | |
1279 | ||
1280 | return NULL; | |
139b011a PF |
1281 | } |
1282 | ||
0ae0e5cd | 1283 | int sd_dhcp6_client_new(sd_dhcp6_client **ret) { |
4afd3348 | 1284 | _cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL; |
da6fe470 | 1285 | size_t t; |
139b011a PF |
1286 | |
1287 | assert_return(ret, -EINVAL); | |
1288 | ||
1289 | client = new0(sd_dhcp6_client, 1); | |
1290 | if (!client) | |
1291 | return -ENOMEM; | |
1292 | ||
3733eec3 | 1293 | client->n_ref = 1; |
139b011a | 1294 | |
2c1ab8ca | 1295 | client->ia_na.type = SD_DHCP6_OPTION_IA_NA; |
f12abb48 | 1296 | |
139b011a PF |
1297 | client->index = -1; |
1298 | ||
c806ffb9 ZJS |
1299 | client->fd = -1; |
1300 | ||
da6fe470 PF |
1301 | client->req_opts_len = ELEMENTSOF(default_req_opts); |
1302 | ||
1303 | client->req_opts = new0(be16_t, client->req_opts_len); | |
1304 | if (!client->req_opts) | |
1305 | return -ENOMEM; | |
1306 | ||
1307 | for (t = 0; t < client->req_opts_len; t++) | |
1308 | client->req_opts[t] = htobe16(default_req_opts[t]); | |
1309 | ||
139b011a PF |
1310 | *ret = client; |
1311 | client = NULL; | |
1312 | ||
1313 | return 0; | |
1314 | } |