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