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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 | ||
ccf86354 | 114 | int sd_dhcp6_client_set_callback(sd_dhcp6_client *client, sd_dhcp6_client_callback_t cb, void *userdata) { |
139b011a PF |
115 | assert_return(client, -EINVAL); |
116 | ||
117 | client->cb = cb; | |
118 | client->userdata = userdata; | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
0ae0e5cd | 123 | int sd_dhcp6_client_set_index(sd_dhcp6_client *client, int interface_index) { |
139b011a PF |
124 | assert_return(client, -EINVAL); |
125 | assert_return(interface_index >= -1, -EINVAL); | |
126 | ||
d7c9c21f PF |
127 | assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY); |
128 | ||
139b011a PF |
129 | client->index = interface_index; |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
c601ebf7 TG |
134 | int sd_dhcp6_client_set_local_address(sd_dhcp6_client *client, const struct in6_addr *local_address) { |
135 | assert_return(client, -EINVAL); | |
136 | assert_return(local_address, -EINVAL); | |
137 | assert_return(in_addr_is_link_local(AF_INET6, (const union in_addr_union *) local_address) > 0, -EINVAL); | |
138 | ||
139 | assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY); | |
140 | ||
141 | client->local_address = *local_address; | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
0ae0e5cd LP |
146 | int sd_dhcp6_client_set_mac( |
147 | sd_dhcp6_client *client, | |
148 | const uint8_t *addr, size_t addr_len, | |
149 | uint16_t arp_type) { | |
150 | ||
139b011a | 151 | assert_return(client, -EINVAL); |
76253e73 DW |
152 | assert_return(addr, -EINVAL); |
153 | assert_return(addr_len > 0 && addr_len <= MAX_MAC_ADDR_LEN, -EINVAL); | |
154 | assert_return(arp_type > 0, -EINVAL); | |
155 | ||
d7c9c21f PF |
156 | assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY); |
157 | ||
76253e73 DW |
158 | if (arp_type == ARPHRD_ETHER) |
159 | assert_return(addr_len == ETH_ALEN, -EINVAL); | |
160 | else if (arp_type == ARPHRD_INFINIBAND) | |
161 | assert_return(addr_len == INFINIBAND_ALEN, -EINVAL); | |
139b011a | 162 | else |
76253e73 DW |
163 | return -EINVAL; |
164 | ||
165 | if (client->mac_addr_len == addr_len && | |
166 | memcmp(&client->mac_addr, addr, addr_len) == 0) | |
167 | return 0; | |
168 | ||
169 | memcpy(&client->mac_addr, addr, addr_len); | |
170 | client->mac_addr_len = addr_len; | |
171 | client->arp_type = arp_type; | |
139b011a PF |
172 | |
173 | return 0; | |
174 | } | |
175 | ||
0ae0e5cd | 176 | static int client_ensure_duid(sd_dhcp6_client *client) { |
cc22955c TH |
177 | if (client->duid_len != 0) |
178 | return 0; | |
0ae0e5cd | 179 | |
cc22955c TH |
180 | return dhcp_identifier_set_duid_en(&client->duid, &client->duid_len); |
181 | } | |
182 | ||
0ae0e5cd LP |
183 | int sd_dhcp6_client_set_duid( |
184 | sd_dhcp6_client *client, | |
185 | uint16_t type, | |
186 | uint8_t *duid, size_t duid_len) { | |
66eac120 DW |
187 | assert_return(client, -EINVAL); |
188 | assert_return(duid, -EINVAL); | |
189 | assert_return(duid_len > 0 && duid_len <= MAX_DUID_LEN, -EINVAL); | |
190 | ||
d7c9c21f PF |
191 | assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY); |
192 | ||
fe4b2156 TG |
193 | switch (type) { |
194 | case DHCP6_DUID_LLT: | |
764aad62 | 195 | if (duid_len <= sizeof(client->duid.llt)) |
fe4b2156 TG |
196 | return -EINVAL; |
197 | break; | |
198 | case DHCP6_DUID_EN: | |
764aad62 | 199 | if (duid_len != sizeof(client->duid.en)) |
fe4b2156 TG |
200 | return -EINVAL; |
201 | break; | |
202 | case DHCP6_DUID_LL: | |
764aad62 | 203 | if (duid_len <= sizeof(client->duid.ll)) |
fe4b2156 TG |
204 | return -EINVAL; |
205 | break; | |
206 | case DHCP6_DUID_UUID: | |
764aad62 | 207 | if (duid_len != sizeof(client->duid.uuid)) |
fe4b2156 TG |
208 | return -EINVAL; |
209 | break; | |
210 | default: | |
211 | /* accept unknown type in order to be forward compatible */ | |
212 | break; | |
213 | } | |
214 | ||
764aad62 | 215 | client->duid.type = htobe16(type); |
ebe207d4 | 216 | memcpy(&client->duid.raw.data, duid, duid_len); |
764aad62 | 217 | client->duid_len = duid_len + sizeof(client->duid.type); |
66eac120 DW |
218 | |
219 | return 0; | |
220 | } | |
221 | ||
04c01369 | 222 | int sd_dhcp6_client_set_information_request(sd_dhcp6_client *client, int enabled) { |
bbfa43ca | 223 | assert_return(client, -EINVAL); |
d7c9c21f PF |
224 | assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY); |
225 | ||
bbfa43ca PF |
226 | client->information_request = enabled; |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
04c01369 | 231 | int sd_dhcp6_client_get_information_request(sd_dhcp6_client *client, int *enabled) { |
bbfa43ca PF |
232 | assert_return(client, -EINVAL); |
233 | assert_return(enabled, -EINVAL); | |
234 | ||
235 | *enabled = client->information_request; | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
0ae0e5cd | 240 | int sd_dhcp6_client_set_request_option(sd_dhcp6_client *client, uint16_t option) { |
da6fe470 PF |
241 | size_t t; |
242 | ||
243 | assert_return(client, -EINVAL); | |
244 | assert_return(client->state == DHCP6_STATE_STOPPED, -EBUSY); | |
245 | ||
246 | switch(option) { | |
2c1ab8ca BG |
247 | case SD_DHCP6_OPTION_DNS_SERVERS: |
248 | case SD_DHCP6_OPTION_DOMAIN_LIST: | |
249 | case SD_DHCP6_OPTION_SNTP_SERVERS: | |
250 | case SD_DHCP6_OPTION_NTP_SERVER: | |
da6fe470 PF |
251 | break; |
252 | ||
253 | default: | |
254 | return -EINVAL; | |
255 | } | |
256 | ||
257 | for (t = 0; t < client->req_opts_len; t++) | |
258 | if (client->req_opts[t] == htobe16(option)) | |
259 | return -EEXIST; | |
260 | ||
261 | if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated, | |
262 | client->req_opts_len + 1)) | |
263 | return -ENOMEM; | |
264 | ||
265 | client->req_opts[client->req_opts_len++] = htobe16(option); | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
ea3b3a75 PF |
270 | int sd_dhcp6_client_get_lease(sd_dhcp6_client *client, sd_dhcp6_lease **ret) { |
271 | assert_return(client, -EINVAL); | |
ea3b3a75 PF |
272 | |
273 | if (!client->lease) | |
274 | return -ENOMSG; | |
275 | ||
3098562c TG |
276 | if (ret) |
277 | *ret = client->lease; | |
ea3b3a75 PF |
278 | |
279 | return 0; | |
280 | } | |
281 | ||
3f0c075f PF |
282 | static void client_notify(sd_dhcp6_client *client, int event) { |
283 | if (client->cb) | |
139b011a | 284 | client->cb(client, event, client->userdata); |
139b011a PF |
285 | } |
286 | ||
f8908727 | 287 | static void client_set_lease(sd_dhcp6_client *client, sd_dhcp6_lease *lease) { |
4e3e6679 PF |
288 | if (client->lease) { |
289 | dhcp6_lease_clear_timers(&client->lease->ia); | |
f8908727 | 290 | sd_dhcp6_lease_unref(client->lease); |
4e3e6679 | 291 | } |
f8908727 TH |
292 | client->lease = lease; |
293 | } | |
294 | ||
295 | static int client_reset(sd_dhcp6_client *client) { | |
296 | assert_return(client, -EINVAL); | |
297 | ||
298 | client_set_lease(client, NULL); | |
4e3e6679 | 299 | |
a9aff361 PF |
300 | client->receive_message = |
301 | sd_event_source_unref(client->receive_message); | |
302 | ||
c806ffb9 | 303 | client->fd = safe_close(client->fd); |
a9aff361 | 304 | |
c3e2adea | 305 | client->transaction_id = 0; |
346e13a2 | 306 | client->transaction_start = 0; |
a9aff361 | 307 | |
f12abb48 PF |
308 | client->ia_na.timeout_t1 = |
309 | sd_event_source_unref(client->ia_na.timeout_t1); | |
310 | client->ia_na.timeout_t2 = | |
311 | sd_event_source_unref(client->ia_na.timeout_t2); | |
312 | ||
d1b0afe3 PF |
313 | client->retransmit_time = 0; |
314 | client->retransmit_count = 0; | |
315 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); | |
316 | client->timeout_resend_expire = | |
317 | sd_event_source_unref(client->timeout_resend_expire); | |
318 | ||
139b011a PF |
319 | client->state = DHCP6_STATE_STOPPED; |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
3f0c075f PF |
324 | static void client_stop(sd_dhcp6_client *client, int error) { |
325 | DHCP6_CLIENT_DONT_DESTROY(client); | |
139b011a | 326 | |
3f0c075f | 327 | assert(client); |
139b011a | 328 | |
3f0c075f PF |
329 | client_notify(client, error); |
330 | ||
331 | client_reset(client); | |
139b011a PF |
332 | } |
333 | ||
346e13a2 | 334 | static int client_send_message(sd_dhcp6_client *client, usec_t time_now) { |
a9aff361 PF |
335 | _cleanup_free_ DHCP6Message *message = NULL; |
336 | struct in6_addr all_servers = | |
337 | IN6ADDR_ALL_DHCP6_RELAY_AGENTS_AND_SERVERS_INIT; | |
338 | size_t len, optlen = 512; | |
339 | uint8_t *opt; | |
340 | int r; | |
346e13a2 PF |
341 | usec_t elapsed_usec; |
342 | be16_t elapsed_time; | |
a9aff361 PF |
343 | |
344 | len = sizeof(DHCP6Message) + optlen; | |
345 | ||
346 | message = malloc0(len); | |
347 | if (!message) | |
348 | return -ENOMEM; | |
349 | ||
350 | opt = (uint8_t *)(message + 1); | |
351 | ||
352 | message->transaction_id = client->transaction_id; | |
353 | ||
354 | switch(client->state) { | |
bbfa43ca PF |
355 | case DHCP6_STATE_INFORMATION_REQUEST: |
356 | message->type = DHCP6_INFORMATION_REQUEST; | |
357 | ||
358 | break; | |
359 | ||
a9aff361 PF |
360 | case DHCP6_STATE_SOLICITATION: |
361 | message->type = DHCP6_SOLICIT; | |
362 | ||
ed6ee219 | 363 | r = dhcp6_option_append(&opt, &optlen, |
2c1ab8ca | 364 | SD_DHCP6_OPTION_RAPID_COMMIT, 0, NULL); |
926695f1 TA |
365 | if (r < 0) |
366 | return r; | |
ed6ee219 | 367 | |
7246333c | 368 | r = dhcp6_option_append_ia(&opt, &optlen, &client->ia_na); |
a9aff361 PF |
369 | if (r < 0) |
370 | return r; | |
371 | ||
7246333c PF |
372 | break; |
373 | ||
374 | case DHCP6_STATE_REQUEST: | |
3dc34fcc PF |
375 | case DHCP6_STATE_RENEW: |
376 | ||
377 | if (client->state == DHCP6_STATE_REQUEST) | |
378 | message->type = DHCP6_REQUEST; | |
379 | else | |
380 | message->type = DHCP6_RENEW; | |
7246333c | 381 | |
2c1ab8ca | 382 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_SERVERID, |
7246333c PF |
383 | client->lease->serverid_len, |
384 | client->lease->serverid); | |
385 | if (r < 0) | |
386 | return r; | |
387 | ||
388 | r = dhcp6_option_append_ia(&opt, &optlen, &client->lease->ia); | |
a9aff361 PF |
389 | if (r < 0) |
390 | return r; | |
391 | ||
392 | break; | |
393 | ||
3dc34fcc PF |
394 | case DHCP6_STATE_REBIND: |
395 | message->type = DHCP6_REBIND; | |
396 | ||
397 | r = dhcp6_option_append_ia(&opt, &optlen, &client->lease->ia); | |
398 | if (r < 0) | |
399 | return r; | |
400 | ||
401 | break; | |
402 | ||
a9aff361 | 403 | case DHCP6_STATE_STOPPED: |
a34b57c0 | 404 | case DHCP6_STATE_BOUND: |
a9aff361 PF |
405 | return -EINVAL; |
406 | } | |
407 | ||
2c1ab8ca | 408 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_ORO, |
da6fe470 PF |
409 | client->req_opts_len * sizeof(be16_t), |
410 | client->req_opts); | |
411 | if (r < 0) | |
412 | return r; | |
413 | ||
cc22955c | 414 | assert (client->duid_len); |
2c1ab8ca | 415 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_CLIENTID, |
66eac120 | 416 | client->duid_len, &client->duid); |
7246333c PF |
417 | if (r < 0) |
418 | return r; | |
419 | ||
346e13a2 PF |
420 | elapsed_usec = time_now - client->transaction_start; |
421 | if (elapsed_usec < 0xffff * USEC_PER_MSEC * 10) | |
422 | elapsed_time = htobe16(elapsed_usec / USEC_PER_MSEC / 10); | |
423 | else | |
424 | elapsed_time = 0xffff; | |
425 | ||
2c1ab8ca | 426 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_ELAPSED_TIME, |
346e13a2 PF |
427 | sizeof(elapsed_time), &elapsed_time); |
428 | if (r < 0) | |
429 | return r; | |
430 | ||
a9aff361 PF |
431 | r = dhcp6_network_send_udp_socket(client->fd, &all_servers, message, |
432 | len - optlen); | |
433 | if (r < 0) | |
434 | return r; | |
435 | ||
436 | log_dhcp6_client(client, "Sent %s", | |
437 | dhcp6_message_type_to_string(message->type)); | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
a34b57c0 PF |
442 | static int client_timeout_t2(sd_event_source *s, uint64_t usec, |
443 | void *userdata) { | |
444 | sd_dhcp6_client *client = userdata; | |
445 | ||
446 | assert_return(s, -EINVAL); | |
447 | assert_return(client, -EINVAL); | |
448 | assert_return(client->lease, -EINVAL); | |
449 | ||
450 | client->lease->ia.timeout_t2 = | |
451 | sd_event_source_unref(client->lease->ia.timeout_t2); | |
452 | ||
453 | log_dhcp6_client(client, "Timeout T2"); | |
454 | ||
3dc34fcc PF |
455 | client_start(client, DHCP6_STATE_REBIND); |
456 | ||
a34b57c0 PF |
457 | return 0; |
458 | } | |
459 | ||
460 | static int client_timeout_t1(sd_event_source *s, uint64_t usec, | |
461 | void *userdata) { | |
462 | sd_dhcp6_client *client = userdata; | |
463 | ||
464 | assert_return(s, -EINVAL); | |
465 | assert_return(client, -EINVAL); | |
466 | assert_return(client->lease, -EINVAL); | |
467 | ||
468 | client->lease->ia.timeout_t1 = | |
469 | sd_event_source_unref(client->lease->ia.timeout_t1); | |
470 | ||
471 | log_dhcp6_client(client, "Timeout T1"); | |
472 | ||
3dc34fcc PF |
473 | client_start(client, DHCP6_STATE_RENEW); |
474 | ||
a34b57c0 PF |
475 | return 0; |
476 | } | |
477 | ||
d1b0afe3 PF |
478 | static int client_timeout_resend_expire(sd_event_source *s, uint64_t usec, |
479 | void *userdata) { | |
480 | sd_dhcp6_client *client = userdata; | |
3dc34fcc PF |
481 | DHCP6_CLIENT_DONT_DESTROY(client); |
482 | enum DHCP6State state; | |
d1b0afe3 PF |
483 | |
484 | assert(s); | |
485 | assert(client); | |
486 | assert(client->event); | |
487 | ||
3dc34fcc PF |
488 | state = client->state; |
489 | ||
10c9ce61 | 490 | client_stop(client, SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE); |
d1b0afe3 | 491 | |
3dc34fcc PF |
492 | /* RFC 3315, section 18.1.4., says that "...the client may choose to |
493 | use a Solicit message to locate a new DHCP server..." */ | |
494 | if (state == DHCP6_STATE_REBIND) | |
495 | client_start(client, DHCP6_STATE_SOLICITATION); | |
496 | ||
d1b0afe3 PF |
497 | return 0; |
498 | } | |
499 | ||
500 | static usec_t client_timeout_compute_random(usec_t val) { | |
501 | return val - val / 10 + | |
502 | (random_u32() % (2 * USEC_PER_SEC)) * val / 10 / USEC_PER_SEC; | |
503 | } | |
504 | ||
505 | static int client_timeout_resend(sd_event_source *s, uint64_t usec, | |
506 | void *userdata) { | |
507 | int r = 0; | |
508 | sd_dhcp6_client *client = userdata; | |
4b4923e6 | 509 | usec_t time_now, init_retransmit_time = 0, max_retransmit_time = 0; |
5e913450 | 510 | usec_t max_retransmit_duration = 0; |
513a6fa8 | 511 | uint8_t max_retransmit_count = 0; |
d1b0afe3 | 512 | char time_string[FORMAT_TIMESPAN_MAX]; |
3dc34fcc | 513 | uint32_t expire = 0; |
d1b0afe3 PF |
514 | |
515 | assert(s); | |
516 | assert(client); | |
517 | assert(client->event); | |
518 | ||
519 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); | |
520 | ||
521 | switch (client->state) { | |
bbfa43ca PF |
522 | case DHCP6_STATE_INFORMATION_REQUEST: |
523 | init_retransmit_time = DHCP6_INF_TIMEOUT; | |
524 | max_retransmit_time = DHCP6_INF_MAX_RT; | |
525 | ||
526 | break; | |
527 | ||
d1b0afe3 | 528 | case DHCP6_STATE_SOLICITATION: |
7246333c PF |
529 | |
530 | if (client->retransmit_count && client->lease) { | |
531 | client_start(client, DHCP6_STATE_REQUEST); | |
532 | return 0; | |
533 | } | |
534 | ||
d1b0afe3 PF |
535 | init_retransmit_time = DHCP6_SOL_TIMEOUT; |
536 | max_retransmit_time = DHCP6_SOL_MAX_RT; | |
d1b0afe3 PF |
537 | |
538 | break; | |
539 | ||
7246333c PF |
540 | case DHCP6_STATE_REQUEST: |
541 | init_retransmit_time = DHCP6_REQ_TIMEOUT; | |
542 | max_retransmit_time = DHCP6_REQ_MAX_RT; | |
543 | max_retransmit_count = DHCP6_REQ_MAX_RC; | |
7246333c PF |
544 | |
545 | break; | |
546 | ||
3dc34fcc PF |
547 | case DHCP6_STATE_RENEW: |
548 | init_retransmit_time = DHCP6_REN_TIMEOUT; | |
549 | max_retransmit_time = DHCP6_REN_MAX_RT; | |
3dc34fcc PF |
550 | |
551 | /* RFC 3315, section 18.1.3. says max retransmit duration will | |
552 | be the remaining time until T2. Instead of setting MRD, | |
553 | wait for T2 to trigger with the same end result */ | |
3dc34fcc PF |
554 | |
555 | break; | |
556 | ||
557 | case DHCP6_STATE_REBIND: | |
558 | init_retransmit_time = DHCP6_REB_TIMEOUT; | |
559 | max_retransmit_time = DHCP6_REB_MAX_RT; | |
3dc34fcc PF |
560 | |
561 | if (!client->timeout_resend_expire) { | |
562 | r = dhcp6_lease_ia_rebind_expire(&client->lease->ia, | |
563 | &expire); | |
564 | if (r < 0) { | |
565 | client_stop(client, r); | |
566 | return 0; | |
567 | } | |
568 | max_retransmit_duration = expire * USEC_PER_SEC; | |
569 | } | |
570 | ||
571 | break; | |
572 | ||
d1b0afe3 | 573 | case DHCP6_STATE_STOPPED: |
a34b57c0 | 574 | case DHCP6_STATE_BOUND: |
d1b0afe3 PF |
575 | return 0; |
576 | } | |
577 | ||
578 | if (max_retransmit_count && | |
579 | client->retransmit_count >= max_retransmit_count) { | |
10c9ce61 | 580 | client_stop(client, SD_DHCP6_CLIENT_EVENT_RETRANS_MAX); |
d1b0afe3 PF |
581 | return 0; |
582 | } | |
583 | ||
fa94c34b | 584 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
d1b0afe3 PF |
585 | if (r < 0) |
586 | goto error; | |
587 | ||
346e13a2 PF |
588 | r = client_send_message(client, time_now); |
589 | if (r >= 0) | |
590 | client->retransmit_count++; | |
591 | ||
d1b0afe3 PF |
592 | if (!client->retransmit_time) { |
593 | client->retransmit_time = | |
594 | client_timeout_compute_random(init_retransmit_time); | |
a9aff361 PF |
595 | |
596 | if (client->state == DHCP6_STATE_SOLICITATION) | |
597 | client->retransmit_time += init_retransmit_time / 10; | |
598 | ||
d1b0afe3 PF |
599 | } else { |
600 | if (max_retransmit_time && | |
601 | client->retransmit_time > max_retransmit_time / 2) | |
602 | client->retransmit_time = client_timeout_compute_random(max_retransmit_time); | |
603 | else | |
604 | client->retransmit_time += client_timeout_compute_random(client->retransmit_time); | |
605 | } | |
606 | ||
607 | log_dhcp6_client(client, "Next retransmission in %s", | |
ed19c567 | 608 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, client->retransmit_time, USEC_PER_SEC)); |
d1b0afe3 PF |
609 | |
610 | r = sd_event_add_time(client->event, &client->timeout_resend, | |
fa94c34b | 611 | clock_boottime_or_monotonic(), |
d1b0afe3 PF |
612 | time_now + client->retransmit_time, |
613 | 10 * USEC_PER_MSEC, client_timeout_resend, | |
614 | client); | |
615 | if (r < 0) | |
616 | goto error; | |
617 | ||
618 | r = sd_event_source_set_priority(client->timeout_resend, | |
619 | client->event_priority); | |
620 | if (r < 0) | |
621 | goto error; | |
622 | ||
356779df | 623 | r = sd_event_source_set_description(client->timeout_resend, "dhcp6-resend-timer"); |
9021bb9f TG |
624 | if (r < 0) |
625 | goto error; | |
626 | ||
d1b0afe3 PF |
627 | if (max_retransmit_duration && !client->timeout_resend_expire) { |
628 | ||
629 | log_dhcp6_client(client, "Max retransmission duration %"PRIu64" secs", | |
630 | max_retransmit_duration / USEC_PER_SEC); | |
631 | ||
632 | r = sd_event_add_time(client->event, | |
633 | &client->timeout_resend_expire, | |
fa94c34b | 634 | clock_boottime_or_monotonic(), |
d1b0afe3 PF |
635 | time_now + max_retransmit_duration, |
636 | USEC_PER_SEC, | |
637 | client_timeout_resend_expire, client); | |
638 | if (r < 0) | |
639 | goto error; | |
640 | ||
641 | r = sd_event_source_set_priority(client->timeout_resend_expire, | |
642 | client->event_priority); | |
643 | if (r < 0) | |
644 | goto error; | |
9021bb9f | 645 | |
356779df | 646 | r = sd_event_source_set_description(client->timeout_resend_expire, "dhcp6-resend-expire-timer"); |
9021bb9f TG |
647 | if (r < 0) |
648 | goto error; | |
d1b0afe3 PF |
649 | } |
650 | ||
651 | error: | |
652 | if (r < 0) | |
653 | client_stop(client, r); | |
654 | ||
655 | return 0; | |
656 | } | |
657 | ||
f12abb48 | 658 | static int client_ensure_iaid(sd_dhcp6_client *client) { |
cfb5b380 | 659 | int r; |
f12abb48 PF |
660 | |
661 | assert(client); | |
662 | ||
663 | if (client->ia_na.id) | |
664 | return 0; | |
665 | ||
cfb5b380 TG |
666 | r = dhcp_identifier_set_iaid(client->index, client->mac_addr, client->mac_addr_len, &client->ia_na.id); |
667 | if (r < 0) | |
668 | return r; | |
f12abb48 PF |
669 | |
670 | return 0; | |
671 | } | |
672 | ||
631bbe71 PF |
673 | static int client_parse_message(sd_dhcp6_client *client, |
674 | DHCP6Message *message, size_t len, | |
675 | sd_dhcp6_lease *lease) { | |
676 | int r; | |
44481a8b | 677 | uint8_t *optval, *option, *id = NULL; |
631bbe71 PF |
678 | uint16_t optcode, status; |
679 | size_t optlen, id_len; | |
680 | bool clientid = false; | |
681 | be32_t iaid_lease; | |
682 | ||
44481a8b ZJS |
683 | option = (uint8_t *)message + sizeof(DHCP6Message); |
684 | len -= sizeof(DHCP6Message); | |
685 | ||
631bbe71 PF |
686 | while ((r = dhcp6_option_parse(&option, &len, &optcode, &optlen, |
687 | &optval)) >= 0) { | |
688 | switch (optcode) { | |
2c1ab8ca | 689 | case SD_DHCP6_OPTION_CLIENTID: |
631bbe71 PF |
690 | if (clientid) { |
691 | log_dhcp6_client(client, "%s contains multiple clientids", | |
692 | dhcp6_message_type_to_string(message->type)); | |
693 | return -EINVAL; | |
694 | } | |
695 | ||
66eac120 | 696 | if (optlen != client->duid_len || |
631bbe71 PF |
697 | memcmp(&client->duid, optval, optlen) != 0) { |
698 | log_dhcp6_client(client, "%s DUID does not match", | |
699 | dhcp6_message_type_to_string(message->type)); | |
700 | ||
701 | return -EINVAL; | |
702 | } | |
703 | clientid = true; | |
704 | ||
705 | break; | |
706 | ||
2c1ab8ca | 707 | case SD_DHCP6_OPTION_SERVERID: |
631bbe71 PF |
708 | r = dhcp6_lease_get_serverid(lease, &id, &id_len); |
709 | if (r >= 0 && id) { | |
710 | log_dhcp6_client(client, "%s contains multiple serverids", | |
711 | dhcp6_message_type_to_string(message->type)); | |
712 | return -EINVAL; | |
713 | } | |
714 | ||
715 | r = dhcp6_lease_set_serverid(lease, optval, optlen); | |
716 | if (r < 0) | |
717 | return r; | |
718 | ||
719 | break; | |
720 | ||
2c1ab8ca | 721 | case SD_DHCP6_OPTION_PREFERENCE: |
631bbe71 PF |
722 | if (optlen != 1) |
723 | return -EINVAL; | |
724 | ||
725 | r = dhcp6_lease_set_preference(lease, *optval); | |
726 | if (r < 0) | |
727 | return r; | |
728 | ||
729 | break; | |
730 | ||
2c1ab8ca | 731 | case SD_DHCP6_OPTION_STATUS_CODE: |
631bbe71 PF |
732 | if (optlen < 2) |
733 | return -EINVAL; | |
734 | ||
735 | status = optval[0] << 8 | optval[1]; | |
736 | if (status) { | |
737 | log_dhcp6_client(client, "%s Status %s", | |
738 | dhcp6_message_type_to_string(message->type), | |
739 | dhcp6_message_status_to_string(status)); | |
740 | return -EINVAL; | |
741 | } | |
742 | ||
743 | break; | |
744 | ||
2c1ab8ca | 745 | case SD_DHCP6_OPTION_IA_NA: |
bbfa43ca PF |
746 | if (client->state == DHCP6_STATE_INFORMATION_REQUEST) { |
747 | log_dhcp6_client(client, "Information request ignoring IA NA option"); | |
748 | ||
749 | break; | |
750 | } | |
751 | ||
631bbe71 PF |
752 | r = dhcp6_option_parse_ia(&optval, &optlen, optcode, |
753 | &lease->ia); | |
754 | if (r < 0 && r != -ENOMSG) | |
755 | return r; | |
756 | ||
757 | r = dhcp6_lease_get_iaid(lease, &iaid_lease); | |
758 | if (r < 0) | |
759 | return r; | |
760 | ||
761 | if (client->ia_na.id != iaid_lease) { | |
762 | log_dhcp6_client(client, "%s has wrong IAID", | |
763 | dhcp6_message_type_to_string(message->type)); | |
764 | return -EINVAL; | |
765 | } | |
766 | ||
767 | break; | |
ed6ee219 | 768 | |
2c1ab8ca | 769 | case SD_DHCP6_OPTION_RAPID_COMMIT: |
ed6ee219 PF |
770 | r = dhcp6_lease_set_rapid_commit(lease); |
771 | if (r < 0) | |
772 | return r; | |
773 | ||
774 | break; | |
7bd8e95d | 775 | |
2c1ab8ca | 776 | case SD_DHCP6_OPTION_DNS_SERVERS: |
7bd8e95d PF |
777 | r = dhcp6_lease_set_dns(lease, optval, optlen); |
778 | if (r < 0) | |
779 | return r; | |
780 | ||
781 | break; | |
5da1b97f | 782 | |
2c1ab8ca | 783 | case SD_DHCP6_OPTION_DOMAIN_LIST: |
5da1b97f PF |
784 | r = dhcp6_lease_set_domains(lease, optval, optlen); |
785 | if (r < 0) | |
786 | return r; | |
787 | ||
788 | break; | |
789 | ||
2c1ab8ca | 790 | case SD_DHCP6_OPTION_NTP_SERVER: |
6599680e PF |
791 | r = dhcp6_lease_set_ntp(lease, optval, optlen); |
792 | if (r < 0) | |
793 | return r; | |
794 | ||
795 | break; | |
41e4615d | 796 | |
2c1ab8ca | 797 | case SD_DHCP6_OPTION_SNTP_SERVERS: |
41e4615d PF |
798 | r = dhcp6_lease_set_sntp(lease, optval, optlen); |
799 | if (r < 0) | |
800 | return r; | |
801 | ||
802 | break; | |
631bbe71 | 803 | } |
6599680e | 804 | |
631bbe71 PF |
805 | } |
806 | ||
c47e8936 PF |
807 | if (r == -ENOMSG) |
808 | r = 0; | |
809 | ||
810 | if (r < 0 || !clientid) { | |
631bbe71 PF |
811 | log_dhcp6_client(client, "%s has incomplete options", |
812 | dhcp6_message_type_to_string(message->type)); | |
813 | return -EINVAL; | |
814 | } | |
815 | ||
bbfa43ca PF |
816 | if (client->state != DHCP6_STATE_INFORMATION_REQUEST) { |
817 | r = dhcp6_lease_get_serverid(lease, &id, &id_len); | |
818 | if (r < 0) | |
819 | log_dhcp6_client(client, "%s has no server id", | |
820 | dhcp6_message_type_to_string(message->type)); | |
821 | } | |
631bbe71 PF |
822 | |
823 | return r; | |
824 | } | |
825 | ||
0ae0e5cd | 826 | static int client_receive_reply(sd_dhcp6_client *client, DHCP6Message *reply, size_t len) { |
a34b57c0 | 827 | int r; |
4afd3348 | 828 | _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; |
ed6ee219 | 829 | bool rapid_commit; |
a34b57c0 PF |
830 | |
831 | if (reply->type != DHCP6_REPLY) | |
ed6ee219 | 832 | return 0; |
a34b57c0 PF |
833 | |
834 | r = dhcp6_lease_new(&lease); | |
835 | if (r < 0) | |
836 | return -ENOMEM; | |
837 | ||
838 | r = client_parse_message(client, reply, len, lease); | |
839 | if (r < 0) | |
840 | return r; | |
841 | ||
ed6ee219 PF |
842 | if (client->state == DHCP6_STATE_SOLICITATION) { |
843 | r = dhcp6_lease_get_rapid_commit(lease, &rapid_commit); | |
844 | if (r < 0) | |
845 | return r; | |
846 | ||
847 | if (!rapid_commit) | |
848 | return 0; | |
849 | } | |
850 | ||
f8908727 | 851 | client_set_lease(client, lease); |
9d89d1ae | 852 | lease = NULL; |
a34b57c0 PF |
853 | |
854 | return DHCP6_STATE_BOUND; | |
855 | } | |
856 | ||
0ae0e5cd | 857 | static int client_receive_advertise(sd_dhcp6_client *client, DHCP6Message *advertise, size_t len) { |
631bbe71 | 858 | int r; |
4afd3348 | 859 | _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; |
631bbe71 PF |
860 | uint8_t pref_advertise = 0, pref_lease = 0; |
861 | ||
862 | if (advertise->type != DHCP6_ADVERTISE) | |
ed6ee219 | 863 | return 0; |
631bbe71 PF |
864 | |
865 | r = dhcp6_lease_new(&lease); | |
866 | if (r < 0) | |
867 | return r; | |
868 | ||
869 | r = client_parse_message(client, advertise, len, lease); | |
870 | if (r < 0) | |
871 | return r; | |
872 | ||
873 | r = dhcp6_lease_get_preference(lease, &pref_advertise); | |
874 | if (r < 0) | |
875 | return r; | |
876 | ||
877 | r = dhcp6_lease_get_preference(client->lease, &pref_lease); | |
bbfa43ca PF |
878 | |
879 | if (r < 0 || pref_advertise > pref_lease) { | |
f8908727 | 880 | client_set_lease(client, lease); |
631bbe71 PF |
881 | lease = NULL; |
882 | r = 0; | |
883 | } | |
884 | ||
7246333c PF |
885 | if (pref_advertise == 255 || client->retransmit_count > 1) |
886 | r = DHCP6_STATE_REQUEST; | |
887 | ||
631bbe71 PF |
888 | return r; |
889 | } | |
890 | ||
0ae0e5cd | 891 | static int client_receive_message(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
631bbe71 | 892 | sd_dhcp6_client *client = userdata; |
3f0c075f | 893 | DHCP6_CLIENT_DONT_DESTROY(client); |
0d43d2fc | 894 | _cleanup_free_ DHCP6Message *message = NULL; |
4edc2c9b LP |
895 | ssize_t buflen, len; |
896 | int r = 0; | |
631bbe71 PF |
897 | |
898 | assert(s); | |
899 | assert(client); | |
900 | assert(client->event); | |
901 | ||
4edc2c9b LP |
902 | buflen = next_datagram_size_fd(fd); |
903 | if (buflen < 0) | |
904 | return buflen; | |
631bbe71 | 905 | |
0d43d2fc | 906 | message = malloc(buflen); |
631bbe71 PF |
907 | if (!message) |
908 | return -ENOMEM; | |
909 | ||
910 | len = read(fd, message, buflen); | |
0d43d2fc TG |
911 | if (len < 0) { |
912 | if (errno == EAGAIN || errno == EINTR) | |
913 | return 0; | |
914 | ||
915 | log_dhcp6_client(client, "Could not receive message from UDP socket: %m"); | |
916 | ||
917 | return -errno; | |
918 | } else if ((size_t)len < sizeof(DHCP6Message)) | |
631bbe71 | 919 | return 0; |
631bbe71 PF |
920 | |
921 | switch(message->type) { | |
922 | case DHCP6_SOLICIT: | |
923 | case DHCP6_REQUEST: | |
924 | case DHCP6_CONFIRM: | |
925 | case DHCP6_RENEW: | |
926 | case DHCP6_REBIND: | |
927 | case DHCP6_RELEASE: | |
928 | case DHCP6_DECLINE: | |
929 | case DHCP6_INFORMATION_REQUEST: | |
930 | case DHCP6_RELAY_FORW: | |
931 | case DHCP6_RELAY_REPL: | |
932 | return 0; | |
933 | ||
934 | case DHCP6_ADVERTISE: | |
935 | case DHCP6_REPLY: | |
936 | case DHCP6_RECONFIGURE: | |
937 | break; | |
938 | ||
939 | default: | |
940 | log_dhcp6_client(client, "unknown message type %d", | |
941 | message->type); | |
942 | return 0; | |
943 | } | |
944 | ||
945 | if (client->transaction_id != (message->transaction_id & | |
946 | htobe32(0x00ffffff))) | |
947 | return 0; | |
948 | ||
949 | switch (client->state) { | |
bbfa43ca PF |
950 | case DHCP6_STATE_INFORMATION_REQUEST: |
951 | r = client_receive_reply(client, message, len); | |
952 | if (r < 0) | |
953 | return 0; | |
954 | ||
10c9ce61 | 955 | client_notify(client, SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST); |
bbfa43ca PF |
956 | |
957 | client_start(client, DHCP6_STATE_STOPPED); | |
958 | ||
959 | break; | |
960 | ||
631bbe71 PF |
961 | case DHCP6_STATE_SOLICITATION: |
962 | r = client_receive_advertise(client, message, len); | |
963 | ||
ed6ee219 | 964 | if (r == DHCP6_STATE_REQUEST) { |
7246333c PF |
965 | client_start(client, r); |
966 | ||
ed6ee219 PF |
967 | break; |
968 | } | |
631bbe71 | 969 | |
ed6ee219 | 970 | /* fall through for Soliciation Rapid Commit option check */ |
7246333c | 971 | case DHCP6_STATE_REQUEST: |
3dc34fcc PF |
972 | case DHCP6_STATE_RENEW: |
973 | case DHCP6_STATE_REBIND: | |
974 | ||
a34b57c0 PF |
975 | r = client_receive_reply(client, message, len); |
976 | if (r < 0) | |
977 | return 0; | |
978 | ||
979 | if (r == DHCP6_STATE_BOUND) { | |
980 | ||
981 | r = client_start(client, DHCP6_STATE_BOUND); | |
982 | if (r < 0) { | |
983 | client_stop(client, r); | |
984 | return 0; | |
985 | } | |
986 | ||
10c9ce61 | 987 | client_notify(client, SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE); |
a34b57c0 PF |
988 | } |
989 | ||
990 | break; | |
991 | ||
992 | case DHCP6_STATE_BOUND: | |
993 | ||
994 | break; | |
995 | ||
631bbe71 | 996 | case DHCP6_STATE_STOPPED: |
631bbe71 PF |
997 | return 0; |
998 | } | |
999 | ||
1000 | if (r >= 0) { | |
1001 | log_dhcp6_client(client, "Recv %s", | |
1002 | dhcp6_message_type_to_string(message->type)); | |
1003 | } | |
1004 | ||
a9aff361 PF |
1005 | return 0; |
1006 | } | |
1007 | ||
0ae0e5cd | 1008 | static int client_start(sd_dhcp6_client *client, enum DHCP6State state) { |
f12abb48 | 1009 | int r; |
a34b57c0 PF |
1010 | usec_t timeout, time_now; |
1011 | char time_string[FORMAT_TIMESPAN_MAX]; | |
f12abb48 PF |
1012 | |
1013 | assert_return(client, -EINVAL); | |
1014 | assert_return(client->event, -EINVAL); | |
1015 | assert_return(client->index > 0, -EINVAL); | |
c3e2adea | 1016 | assert_return(client->state != state, -EINVAL); |
f12abb48 | 1017 | |
c3e2adea PF |
1018 | client->timeout_resend_expire = |
1019 | sd_event_source_unref(client->timeout_resend_expire); | |
1020 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); | |
1021 | client->retransmit_time = 0; | |
1022 | client->retransmit_count = 0; | |
f12abb48 | 1023 | |
38a03f06 LP |
1024 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
1025 | if (r < 0) | |
1026 | return r; | |
346e13a2 | 1027 | |
c3e2adea PF |
1028 | switch (state) { |
1029 | case DHCP6_STATE_STOPPED: | |
bbfa43ca PF |
1030 | if (client->state == DHCP6_STATE_INFORMATION_REQUEST) { |
1031 | client->state = DHCP6_STATE_STOPPED; | |
a9aff361 | 1032 | |
bbfa43ca PF |
1033 | return 0; |
1034 | } | |
9021bb9f | 1035 | |
bbfa43ca PF |
1036 | /* fall through */ |
1037 | case DHCP6_STATE_SOLICITATION: | |
c3e2adea PF |
1038 | client->state = DHCP6_STATE_SOLICITATION; |
1039 | ||
7246333c PF |
1040 | break; |
1041 | ||
bbfa43ca | 1042 | case DHCP6_STATE_INFORMATION_REQUEST: |
7246333c | 1043 | case DHCP6_STATE_REQUEST: |
3dc34fcc PF |
1044 | case DHCP6_STATE_RENEW: |
1045 | case DHCP6_STATE_REBIND: | |
a34b57c0 | 1046 | |
7246333c PF |
1047 | client->state = state; |
1048 | ||
c3e2adea | 1049 | break; |
a34b57c0 PF |
1050 | |
1051 | case DHCP6_STATE_BOUND: | |
1052 | ||
a34b57c0 PF |
1053 | if (client->lease->ia.lifetime_t1 == 0xffffffff || |
1054 | client->lease->ia.lifetime_t2 == 0xffffffff) { | |
1055 | ||
1056 | log_dhcp6_client(client, "infinite T1 0x%08x or T2 0x%08x", | |
1057 | be32toh(client->lease->ia.lifetime_t1), | |
1058 | be32toh(client->lease->ia.lifetime_t2)); | |
1059 | ||
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | timeout = client_timeout_compute_random(be32toh(client->lease->ia.lifetime_t1) * USEC_PER_SEC); | |
1064 | ||
1065 | log_dhcp6_client(client, "T1 expires in %s", | |
ed19c567 | 1066 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, timeout, USEC_PER_SEC)); |
a34b57c0 PF |
1067 | |
1068 | r = sd_event_add_time(client->event, | |
1069 | &client->lease->ia.timeout_t1, | |
fa94c34b | 1070 | clock_boottime_or_monotonic(), time_now + timeout, |
a34b57c0 PF |
1071 | 10 * USEC_PER_SEC, client_timeout_t1, |
1072 | client); | |
1073 | if (r < 0) | |
1074 | return r; | |
1075 | ||
1076 | r = sd_event_source_set_priority(client->lease->ia.timeout_t1, | |
1077 | client->event_priority); | |
1078 | if (r < 0) | |
1079 | return r; | |
1080 | ||
356779df | 1081 | r = sd_event_source_set_description(client->lease->ia.timeout_t1, "dhcp6-t1-timeout"); |
9021bb9f TG |
1082 | if (r < 0) |
1083 | return r; | |
1084 | ||
a34b57c0 PF |
1085 | timeout = client_timeout_compute_random(be32toh(client->lease->ia.lifetime_t2) * USEC_PER_SEC); |
1086 | ||
1087 | log_dhcp6_client(client, "T2 expires in %s", | |
ed19c567 | 1088 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, timeout, USEC_PER_SEC)); |
a34b57c0 PF |
1089 | |
1090 | r = sd_event_add_time(client->event, | |
1091 | &client->lease->ia.timeout_t2, | |
fa94c34b | 1092 | clock_boottime_or_monotonic(), time_now + timeout, |
a34b57c0 PF |
1093 | 10 * USEC_PER_SEC, client_timeout_t2, |
1094 | client); | |
1095 | if (r < 0) | |
1096 | return r; | |
1097 | ||
1098 | r = sd_event_source_set_priority(client->lease->ia.timeout_t2, | |
1099 | client->event_priority); | |
1100 | if (r < 0) | |
1101 | return r; | |
1102 | ||
356779df | 1103 | r = sd_event_source_set_description(client->lease->ia.timeout_t2, "dhcp6-t2-timeout"); |
9021bb9f TG |
1104 | if (r < 0) |
1105 | return r; | |
1106 | ||
3dc34fcc PF |
1107 | client->state = state; |
1108 | ||
a34b57c0 | 1109 | return 0; |
c3e2adea | 1110 | } |
a9aff361 | 1111 | |
c3e2adea | 1112 | client->transaction_id = random_u32() & htobe32(0x00ffffff); |
346e13a2 | 1113 | client->transaction_start = time_now; |
d1b0afe3 PF |
1114 | |
1115 | r = sd_event_add_time(client->event, &client->timeout_resend, | |
fa94c34b | 1116 | clock_boottime_or_monotonic(), 0, 0, client_timeout_resend, |
d1b0afe3 PF |
1117 | client); |
1118 | if (r < 0) | |
1119 | return r; | |
1120 | ||
1121 | r = sd_event_source_set_priority(client->timeout_resend, | |
1122 | client->event_priority); | |
1123 | if (r < 0) | |
1124 | return r; | |
1125 | ||
356779df | 1126 | r = sd_event_source_set_description(client->timeout_resend, "dhcp6-resend-timeout"); |
9021bb9f TG |
1127 | if (r < 0) |
1128 | return r; | |
1129 | ||
f12abb48 PF |
1130 | return 0; |
1131 | } | |
1132 | ||
0ae0e5cd | 1133 | int sd_dhcp6_client_stop(sd_dhcp6_client *client) { |
f667c150 TG |
1134 | assert_return(client, -EINVAL); |
1135 | ||
10c9ce61 | 1136 | client_stop(client, SD_DHCP6_CLIENT_EVENT_STOP); |
139b011a PF |
1137 | |
1138 | return 0; | |
1139 | } | |
1140 | ||
f667c150 TG |
1141 | int sd_dhcp6_client_is_running(sd_dhcp6_client *client) { |
1142 | assert_return(client, -EINVAL); | |
1143 | ||
1144 | return client->state != DHCP6_STATE_STOPPED; | |
1145 | } | |
1146 | ||
0ae0e5cd | 1147 | int sd_dhcp6_client_start(sd_dhcp6_client *client) { |
139b011a | 1148 | int r = 0; |
bbfa43ca | 1149 | enum DHCP6State state = DHCP6_STATE_SOLICITATION; |
139b011a PF |
1150 | |
1151 | assert_return(client, -EINVAL); | |
1152 | assert_return(client->event, -EINVAL); | |
1153 | assert_return(client->index > 0, -EINVAL); | |
c601ebf7 | 1154 | assert_return(in_addr_is_link_local(AF_INET6, (const union in_addr_union *) &client->local_address) > 0, -EINVAL); |
139b011a | 1155 | |
d7c9c21f | 1156 | if (!IN_SET(client->state, DHCP6_STATE_STOPPED)) |
63348d13 | 1157 | return -EBUSY; |
d7c9c21f | 1158 | |
c806ffb9 | 1159 | r = client_reset(client); |
f12abb48 PF |
1160 | if (r < 0) |
1161 | return r; | |
1162 | ||
bbfa43ca PF |
1163 | r = client_ensure_iaid(client); |
1164 | if (r < 0) | |
1165 | return r; | |
1166 | ||
cc22955c TH |
1167 | r = client_ensure_duid(client); |
1168 | if (r < 0) | |
1169 | return r; | |
1170 | ||
c601ebf7 | 1171 | r = dhcp6_network_bind_udp_socket(client->index, &client->local_address); |
bbfa43ca PF |
1172 | if (r < 0) |
1173 | return r; | |
1174 | ||
1175 | client->fd = r; | |
1176 | ||
1177 | r = sd_event_add_io(client->event, &client->receive_message, | |
1178 | client->fd, EPOLLIN, client_receive_message, | |
1179 | client); | |
1180 | if (r < 0) | |
1181 | goto error; | |
1182 | ||
1183 | r = sd_event_source_set_priority(client->receive_message, | |
1184 | client->event_priority); | |
1185 | if (r < 0) | |
1186 | goto error; | |
1187 | ||
1188 | r = sd_event_source_set_description(client->receive_message, | |
1189 | "dhcp6-receive-message"); | |
1190 | if (r < 0) | |
1191 | goto error; | |
1192 | ||
1193 | if (client->information_request) | |
1194 | state = DHCP6_STATE_INFORMATION_REQUEST; | |
1195 | ||
1196 | log_dhcp6_client(client, "Started in %s mode", | |
1197 | client->information_request? "Information request": | |
1198 | "Managed"); | |
1199 | ||
1200 | return client_start(client, state); | |
1201 | ||
1202 | error: | |
1203 | client_reset(client); | |
1204 | return r; | |
139b011a PF |
1205 | } |
1206 | ||
0ae0e5cd | 1207 | int sd_dhcp6_client_attach_event(sd_dhcp6_client *client, sd_event *event, int priority) { |
139b011a PF |
1208 | int r; |
1209 | ||
1210 | assert_return(client, -EINVAL); | |
1211 | assert_return(!client->event, -EBUSY); | |
1212 | ||
1213 | if (event) | |
1214 | client->event = sd_event_ref(event); | |
1215 | else { | |
1216 | r = sd_event_default(&client->event); | |
1217 | if (r < 0) | |
1218 | return 0; | |
1219 | } | |
1220 | ||
1221 | client->event_priority = priority; | |
1222 | ||
1223 | return 0; | |
1224 | } | |
1225 | ||
1226 | int sd_dhcp6_client_detach_event(sd_dhcp6_client *client) { | |
1227 | assert_return(client, -EINVAL); | |
1228 | ||
1229 | client->event = sd_event_unref(client->event); | |
1230 | ||
1231 | return 0; | |
1232 | } | |
1233 | ||
1234 | sd_event *sd_dhcp6_client_get_event(sd_dhcp6_client *client) { | |
1235 | if (!client) | |
1236 | return NULL; | |
1237 | ||
1238 | return client->event; | |
1239 | } | |
1240 | ||
1241 | sd_dhcp6_client *sd_dhcp6_client_ref(sd_dhcp6_client *client) { | |
3733eec3 LP |
1242 | |
1243 | if (!client) | |
1244 | return NULL; | |
1245 | ||
1246 | assert(client->n_ref >= 1); | |
1247 | client->n_ref++; | |
139b011a PF |
1248 | |
1249 | return client; | |
1250 | } | |
1251 | ||
1252 | sd_dhcp6_client *sd_dhcp6_client_unref(sd_dhcp6_client *client) { | |
139b011a | 1253 | |
3733eec3 LP |
1254 | if (!client) |
1255 | return NULL; | |
139b011a | 1256 | |
3733eec3 LP |
1257 | assert(client->n_ref >= 1); |
1258 | client->n_ref--; | |
139b011a | 1259 | |
3733eec3 | 1260 | if (client->n_ref > 0) |
139b011a | 1261 | return NULL; |
139b011a | 1262 | |
3733eec3 LP |
1263 | client_reset(client); |
1264 | ||
1265 | sd_dhcp6_client_detach_event(client); | |
3733eec3 LP |
1266 | |
1267 | free(client->req_opts); | |
1268 | free(client); | |
1269 | ||
1270 | return NULL; | |
139b011a PF |
1271 | } |
1272 | ||
0ae0e5cd | 1273 | int sd_dhcp6_client_new(sd_dhcp6_client **ret) { |
4afd3348 | 1274 | _cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL; |
da6fe470 | 1275 | size_t t; |
139b011a PF |
1276 | |
1277 | assert_return(ret, -EINVAL); | |
1278 | ||
1279 | client = new0(sd_dhcp6_client, 1); | |
1280 | if (!client) | |
1281 | return -ENOMEM; | |
1282 | ||
3733eec3 | 1283 | client->n_ref = 1; |
139b011a | 1284 | |
2c1ab8ca | 1285 | client->ia_na.type = SD_DHCP6_OPTION_IA_NA; |
f12abb48 | 1286 | |
139b011a PF |
1287 | client->index = -1; |
1288 | ||
c806ffb9 ZJS |
1289 | client->fd = -1; |
1290 | ||
da6fe470 PF |
1291 | client->req_opts_len = ELEMENTSOF(default_req_opts); |
1292 | ||
1293 | client->req_opts = new0(be16_t, client->req_opts_len); | |
1294 | if (!client->req_opts) | |
1295 | return -ENOMEM; | |
1296 | ||
1297 | for (t = 0; t < client->req_opts_len; t++) | |
1298 | client->req_opts[t] = htobe16(default_req_opts[t]); | |
1299 | ||
139b011a PF |
1300 | *ret = client; |
1301 | client = NULL; | |
1302 | ||
1303 | return 0; | |
1304 | } |