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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
139b011a | 2 | /*** |
810adae9 | 3 | Copyright © 2014-2015 Intel Corporation. All rights reserved. |
139b011a PF |
4 | ***/ |
5 | ||
6 | #include <errno.h> | |
631bbe71 | 7 | #include <sys/ioctl.h> |
8f815e8b | 8 | #include <linux/if_arp.h> |
76253e73 | 9 | #include <linux/if_infiniband.h> |
139b011a | 10 | |
139b011a | 11 | #include "sd-dhcp6-client.h" |
07630cea | 12 | |
b5efdb8a | 13 | #include "alloc-util.h" |
07630cea | 14 | #include "dhcp-identifier.h" |
f12abb48 | 15 | #include "dhcp6-internal.h" |
631bbe71 | 16 | #include "dhcp6-lease-internal.h" |
8006aa32 | 17 | #include "dns-domain.h" |
c9393e8c | 18 | #include "event-util.h" |
3ffd4af2 | 19 | #include "fd-util.h" |
6b7d5b6e | 20 | #include "hexdecoct.h" |
8006aa32 | 21 | #include "hostname-util.h" |
c601ebf7 | 22 | #include "in-addr-util.h" |
653ddc1d | 23 | #include "io-util.h" |
07630cea | 24 | #include "random-util.h" |
4edc2c9b | 25 | #include "socket-util.h" |
7e19cc54 | 26 | #include "strv.h" |
de8d6e55 | 27 | #include "web-util.h" |
139b011a | 28 | |
da6fe470 | 29 | static const uint16_t default_req_opts[] = { |
2c1ab8ca BG |
30 | SD_DHCP6_OPTION_DNS_SERVERS, |
31 | SD_DHCP6_OPTION_DOMAIN_LIST, | |
32 | SD_DHCP6_OPTION_NTP_SERVER, | |
33 | SD_DHCP6_OPTION_SNTP_SERVERS, | |
da6fe470 PF |
34 | }; |
35 | ||
3f0c075f | 36 | #define DHCP6_CLIENT_DONT_DESTROY(client) \ |
4afd3348 | 37 | _cleanup_(sd_dhcp6_client_unrefp) _unused_ sd_dhcp6_client *_dont_destroy_##client = sd_dhcp6_client_ref(client) |
3f0c075f | 38 | |
e5d69be2 | 39 | static int client_start_transaction(sd_dhcp6_client *client, DHCP6State state); |
c3e2adea | 40 | |
4b558378 ZJS |
41 | int sd_dhcp6_client_set_callback( |
42 | sd_dhcp6_client *client, | |
43 | sd_dhcp6_client_callback_t cb, | |
44 | void *userdata) { | |
45aa74c7 | 45 | |
139b011a PF |
46 | assert_return(client, -EINVAL); |
47 | ||
45aa74c7 | 48 | client->callback = cb; |
139b011a PF |
49 | client->userdata = userdata; |
50 | ||
51 | return 0; | |
52 | } | |
53 | ||
2f8e7633 | 54 | int sd_dhcp6_client_set_ifindex(sd_dhcp6_client *client, int ifindex) { |
2f8e7633 | 55 | assert_return(client, -EINVAL); |
6f4490bb | 56 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
7fa69c0a | 57 | assert_return(ifindex > 0, -EINVAL); |
d7c9c21f | 58 | |
2f8e7633 | 59 | client->ifindex = ifindex; |
139b011a PF |
60 | return 0; |
61 | } | |
62 | ||
61a9fa8f YW |
63 | int sd_dhcp6_client_set_ifname(sd_dhcp6_client *client, const char *ifname) { |
64 | assert_return(client, -EINVAL); | |
65 | assert_return(ifname, -EINVAL); | |
66 | ||
67 | if (!ifname_valid_full(ifname, IFNAME_VALID_ALTERNATIVE)) | |
68 | return -EINVAL; | |
69 | ||
70 | return free_and_strdup(&client->ifname, ifname); | |
71 | } | |
72 | ||
5977b71f YW |
73 | int sd_dhcp6_client_get_ifname(sd_dhcp6_client *client, const char **ret) { |
74 | int r; | |
61a9fa8f | 75 | |
5977b71f YW |
76 | assert_return(client, -EINVAL); |
77 | ||
78 | r = get_ifname(client->ifindex, &client->ifname); | |
79 | if (r < 0) | |
80 | return r; | |
81 | ||
82 | if (ret) | |
83 | *ret = client->ifname; | |
84 | ||
85 | return 0; | |
61a9fa8f YW |
86 | } |
87 | ||
4b558378 ZJS |
88 | int sd_dhcp6_client_set_local_address( |
89 | sd_dhcp6_client *client, | |
90 | const struct in6_addr *local_address) { | |
91 | ||
c601ebf7 | 92 | assert_return(client, -EINVAL); |
6f4490bb | 93 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
c601ebf7 | 94 | assert_return(local_address, -EINVAL); |
94876904 | 95 | assert_return(in6_addr_is_link_local(local_address) > 0, -EINVAL); |
c601ebf7 TG |
96 | |
97 | client->local_address = *local_address; | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
0ae0e5cd LP |
102 | int sd_dhcp6_client_set_mac( |
103 | sd_dhcp6_client *client, | |
1978efb9 YW |
104 | const uint8_t *addr, |
105 | size_t addr_len, | |
0ae0e5cd LP |
106 | uint16_t arp_type) { |
107 | ||
139b011a | 108 | assert_return(client, -EINVAL); |
76253e73 | 109 | assert_return(addr, -EINVAL); |
1978efb9 | 110 | assert_return(addr_len <= sizeof(client->hw_addr.bytes), -EINVAL); |
6f4490bb YW |
111 | |
112 | /* Unlike the other setters, it is OK to set a new MAC address while the client is running, | |
113 | * as the MAC address is used only when setting DUID or IAID. */ | |
d7c9c21f | 114 | |
76253e73 DW |
115 | if (arp_type == ARPHRD_ETHER) |
116 | assert_return(addr_len == ETH_ALEN, -EINVAL); | |
117 | else if (arp_type == ARPHRD_INFINIBAND) | |
118 | assert_return(addr_len == INFINIBAND_ALEN, -EINVAL); | |
1d370b2c JT |
119 | else { |
120 | client->arp_type = ARPHRD_NONE; | |
1978efb9 | 121 | client->hw_addr.length = 0; |
1d370b2c JT |
122 | return 0; |
123 | } | |
76253e73 | 124 | |
1978efb9 YW |
125 | memcpy(client->hw_addr.bytes, addr, addr_len); |
126 | client->hw_addr.length = addr_len; | |
76253e73 | 127 | client->arp_type = arp_type; |
139b011a PF |
128 | |
129 | return 0; | |
130 | } | |
131 | ||
2805536b SS |
132 | int sd_dhcp6_client_set_prefix_delegation_hint( |
133 | sd_dhcp6_client *client, | |
134 | uint8_t prefixlen, | |
877bfc78 YW |
135 | const struct in6_addr *pd_prefix) { |
136 | ||
137 | _cleanup_free_ DHCP6Address *prefix = NULL; | |
2805536b SS |
138 | |
139 | assert_return(client, -EINVAL); | |
6f4490bb | 140 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
2805536b | 141 | |
877bfc78 YW |
142 | if (!pd_prefix) { |
143 | /* clear previous assignments. */ | |
144 | dhcp6_ia_clear_addresses(&client->ia_pd); | |
145 | return 0; | |
146 | } | |
147 | ||
148 | assert_return(prefixlen > 0 && prefixlen <= 128, -EINVAL); | |
2805536b | 149 | |
877bfc78 YW |
150 | prefix = new(DHCP6Address, 1); |
151 | if (!prefix) | |
152 | return -ENOMEM; | |
153 | ||
154 | *prefix = (DHCP6Address) { | |
155 | .iapdprefix.address = *pd_prefix, | |
156 | .iapdprefix.prefixlen = prefixlen, | |
157 | }; | |
158 | ||
159 | LIST_PREPEND(addresses, client->ia_pd.addresses, TAKE_PTR(prefix)); | |
160 | return 1; | |
2805536b SS |
161 | } |
162 | ||
99ccb8ff SS |
163 | int sd_dhcp6_client_add_vendor_option(sd_dhcp6_client *client, sd_dhcp6_option *v) { |
164 | int r; | |
165 | ||
166 | assert_return(client, -EINVAL); | |
6f4490bb | 167 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
99ccb8ff | 168 | |
9e4dee4c YW |
169 | if (!v) { |
170 | /* Clear the previous assignments. */ | |
171 | ordered_set_clear(client->vendor_options); | |
172 | return 0; | |
173 | } | |
174 | ||
175 | r = ordered_set_ensure_put(&client->vendor_options, &dhcp6_option_hash_ops, v); | |
99ccb8ff SS |
176 | if (r < 0) |
177 | return r; | |
178 | ||
179 | sd_dhcp6_option_ref(v); | |
180 | ||
181 | return 1; | |
182 | } | |
183 | ||
0ae0e5cd | 184 | static int client_ensure_duid(sd_dhcp6_client *client) { |
6f4490bb YW |
185 | assert(client); |
186 | ||
cc22955c TH |
187 | if (client->duid_len != 0) |
188 | return 0; | |
0ae0e5cd | 189 | |
ac680f76 | 190 | return dhcp_identifier_set_duid_en(client->test_mode, &client->duid, &client->duid_len); |
cc22955c TH |
191 | } |
192 | ||
d7df2fd3 ZJS |
193 | /** |
194 | * Sets DUID. If duid is non-null, the DUID is set to duid_type + duid | |
195 | * without further modification. Otherwise, if duid_type is supported, DUID | |
196 | * is set based on that type. Otherwise, an error is returned. | |
197 | */ | |
7e90a499 | 198 | static int dhcp6_client_set_duid_internal( |
4b558378 | 199 | sd_dhcp6_client *client, |
5e1618fa | 200 | DUIDType duid_type, |
f7a92d1a | 201 | const void *duid, |
7e90a499 YW |
202 | size_t duid_len, |
203 | usec_t llt_time) { | |
413708d1 | 204 | int r; |
27eba50e | 205 | |
66eac120 | 206 | assert_return(client, -EINVAL); |
6f4490bb YW |
207 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
208 | assert_return(duid_len == 0 || duid, -EINVAL); | |
c83321e6 | 209 | |
1d6cc5d0 | 210 | if (duid) { |
ab4a88bc TH |
211 | r = dhcp_validate_duid_len(duid_type, duid_len, true); |
212 | if (r < 0) { | |
213 | r = dhcp_validate_duid_len(duid_type, duid_len, false); | |
214 | if (r < 0) | |
a339859f | 215 | return log_dhcp6_client_errno(client, r, "Failed to validate length of DUID: %m"); |
01bcea49 LP |
216 | |
217 | log_dhcp6_client(client, "Using DUID of type %u of incorrect length, proceeding.", duid_type); | |
ab4a88bc | 218 | } |
d7df2fd3 | 219 | |
413708d1 VK |
220 | client->duid.type = htobe16(duid_type); |
221 | memcpy(&client->duid.raw.data, duid, duid_len); | |
d7df2fd3 | 222 | client->duid_len = sizeof(client->duid.type) + duid_len; |
335f80a6 | 223 | |
5e1618fa YW |
224 | } else { |
225 | r = dhcp_identifier_set_duid(duid_type, client->hw_addr.bytes, client->hw_addr.length, | |
ac680f76 | 226 | client->arp_type, llt_time, client->test_mode, &client->duid, &client->duid_len); |
5e1618fa YW |
227 | if (r == -EOPNOTSUPP) |
228 | return log_dhcp6_client_errno(client, r, | |
229 | "Failed to set %s. MAC address is not set or " | |
230 | "interface type is not supported.", | |
231 | duid_type_to_string(duid_type)); | |
232 | if (r < 0) | |
233 | return log_dhcp6_client_errno(client, r, "Failed to set %s: %m", | |
234 | duid_type_to_string(duid_type)); | |
235 | } | |
fe4b2156 | 236 | |
413708d1 VK |
237 | return 0; |
238 | } | |
239 | ||
7e90a499 YW |
240 | int sd_dhcp6_client_set_duid( |
241 | sd_dhcp6_client *client, | |
242 | uint16_t duid_type, | |
243 | const void *duid, | |
244 | size_t duid_len) { | |
245 | return dhcp6_client_set_duid_internal(client, duid_type, duid, duid_len, 0); | |
246 | } | |
247 | ||
248 | int sd_dhcp6_client_set_duid_llt( | |
249 | sd_dhcp6_client *client, | |
250 | usec_t llt_time) { | |
251 | return dhcp6_client_set_duid_internal(client, DUID_TYPE_LLT, NULL, 0, llt_time); | |
252 | } | |
253 | ||
6b7d5b6e SS |
254 | int sd_dhcp6_client_duid_as_string( |
255 | sd_dhcp6_client *client, | |
256 | char **duid) { | |
257 | _cleanup_free_ char *p = NULL, *s = NULL, *t = NULL; | |
258 | const char *v; | |
259 | int r; | |
260 | ||
261 | assert_return(client, -EINVAL); | |
262 | assert_return(client->duid_len > 0, -ENODATA); | |
361eb412 | 263 | assert_return(duid, -EINVAL); |
6b7d5b6e | 264 | |
f9971018 | 265 | v = duid_type_to_string(be16toh(client->duid.type)); |
6b7d5b6e SS |
266 | if (v) { |
267 | s = strdup(v); | |
268 | if (!s) | |
269 | return -ENOMEM; | |
270 | } else { | |
271 | r = asprintf(&s, "%0x", client->duid.type); | |
272 | if (r < 0) | |
273 | return -ENOMEM; | |
274 | } | |
275 | ||
276 | t = hexmem(&client->duid.raw.data, client->duid_len); | |
277 | if (!t) | |
278 | return -ENOMEM; | |
279 | ||
280 | p = strjoin(s, ":", t); | |
281 | if (!p) | |
282 | return -ENOMEM; | |
283 | ||
284 | *duid = TAKE_PTR(p); | |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
413708d1 VK |
289 | int sd_dhcp6_client_set_iaid(sd_dhcp6_client *client, uint32_t iaid) { |
290 | assert_return(client, -EINVAL); | |
6f4490bb | 291 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
413708d1 | 292 | |
4b0f2717 YW |
293 | client->ia_na.header.id = htobe32(iaid); |
294 | client->ia_pd.header.id = htobe32(iaid); | |
8217ed5e | 295 | client->iaid_set = true; |
66eac120 DW |
296 | |
297 | return 0; | |
298 | } | |
299 | ||
0eca25ba YW |
300 | static int client_ensure_iaid(sd_dhcp6_client *client) { |
301 | int r; | |
302 | uint32_t iaid; | |
303 | ||
8d71f2b3 YW |
304 | assert(client); |
305 | ||
0eca25ba YW |
306 | if (client->iaid_set) |
307 | return 0; | |
308 | ||
1978efb9 | 309 | r = dhcp_identifier_set_iaid(client->ifindex, client->hw_addr.bytes, client->hw_addr.length, |
0eca25ba YW |
310 | /* legacy_unstable_byteorder = */ true, |
311 | /* use_mac = */ client->test_mode, | |
312 | &iaid); | |
313 | if (r < 0) | |
314 | return r; | |
315 | ||
316 | client->ia_na.header.id = iaid; | |
317 | client->ia_pd.header.id = iaid; | |
318 | client->iaid_set = true; | |
319 | ||
320 | return 0; | |
8d71f2b3 YW |
321 | } |
322 | ||
d69d4038 SS |
323 | int sd_dhcp6_client_get_iaid(sd_dhcp6_client *client, uint32_t *iaid) { |
324 | assert_return(client, -EINVAL); | |
325 | assert_return(iaid, -EINVAL); | |
326 | ||
327 | if (!client->iaid_set) | |
328 | return -ENODATA; | |
329 | ||
4b0f2717 | 330 | *iaid = be32toh(client->ia_na.header.id); |
d69d4038 SS |
331 | |
332 | return 0; | |
333 | } | |
334 | ||
0eca25ba YW |
335 | void dhcp6_client_set_test_mode(sd_dhcp6_client *client, bool test_mode) { |
336 | assert(client); | |
337 | ||
338 | client->test_mode = test_mode; | |
339 | } | |
340 | ||
8006aa32 SA |
341 | int sd_dhcp6_client_set_fqdn( |
342 | sd_dhcp6_client *client, | |
343 | const char *fqdn) { | |
344 | ||
345 | assert_return(client, -EINVAL); | |
6f4490bb | 346 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
8006aa32 SA |
347 | |
348 | /* Make sure FQDN qualifies as DNS and as Linux hostname */ | |
349 | if (fqdn && | |
52ef5dd7 | 350 | !(hostname_is_valid(fqdn, 0) && dns_name_is_valid(fqdn) > 0)) |
8006aa32 SA |
351 | return -EINVAL; |
352 | ||
353 | return free_and_strdup(&client->fqdn, fqdn); | |
354 | } | |
355 | ||
04c01369 | 356 | int sd_dhcp6_client_set_information_request(sd_dhcp6_client *client, int enabled) { |
bbfa43ca | 357 | assert_return(client, -EINVAL); |
6f4490bb | 358 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
d7c9c21f | 359 | |
bbfa43ca PF |
360 | client->information_request = enabled; |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
04c01369 | 365 | int sd_dhcp6_client_get_information_request(sd_dhcp6_client *client, int *enabled) { |
bbfa43ca PF |
366 | assert_return(client, -EINVAL); |
367 | assert_return(enabled, -EINVAL); | |
368 | ||
369 | *enabled = client->information_request; | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
0ae0e5cd | 374 | int sd_dhcp6_client_set_request_option(sd_dhcp6_client *client, uint16_t option) { |
da6fe470 PF |
375 | size_t t; |
376 | ||
377 | assert_return(client, -EINVAL); | |
6f4490bb | 378 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
da6fe470 | 379 | |
fea8c180 | 380 | if (!dhcp6_option_can_request(option)) |
da6fe470 | 381 | return -EINVAL; |
da6fe470 PF |
382 | |
383 | for (t = 0; t < client->req_opts_len; t++) | |
384 | if (client->req_opts[t] == htobe16(option)) | |
385 | return -EEXIST; | |
386 | ||
319a4f4b | 387 | if (!GREEDY_REALLOC(client->req_opts, client->req_opts_len + 1)) |
da6fe470 PF |
388 | return -ENOMEM; |
389 | ||
390 | client->req_opts[client->req_opts_len++] = htobe16(option); | |
391 | ||
392 | return 0; | |
393 | } | |
394 | ||
feb7d7a2 | 395 | int sd_dhcp6_client_set_request_mud_url(sd_dhcp6_client *client, const char *mudurl) { |
de8d6e55 | 396 | assert_return(client, -EINVAL); |
6f4490bb | 397 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
de8d6e55 | 398 | assert_return(mudurl, -EINVAL); |
2d3adfa6 | 399 | assert_return(strlen(mudurl) <= UINT8_MAX, -EINVAL); |
de8d6e55 SS |
400 | assert_return(http_url_is_valid(mudurl), -EINVAL); |
401 | ||
402 | return free_and_strdup(&client->mudurl, mudurl); | |
403 | } | |
404 | ||
5a99444e YW |
405 | int sd_dhcp6_client_set_request_user_class(sd_dhcp6_client *client, char * const *user_class) { |
406 | char * const *p; | |
407 | char **s; | |
33923925 SS |
408 | |
409 | assert_return(client, -EINVAL); | |
6f4490bb | 410 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
5a99444e | 411 | assert_return(!strv_isempty(user_class), -EINVAL); |
73c8ced7 | 412 | |
5a99444e YW |
413 | STRV_FOREACH(p, user_class) { |
414 | size_t len = strlen(*p); | |
33923925 | 415 | |
5a99444e YW |
416 | if (len > UINT16_MAX || len == 0) |
417 | return -EINVAL; | |
418 | } | |
33923925 | 419 | |
2d3adfa6 | 420 | s = strv_copy(user_class); |
33923925 SS |
421 | if (!s) |
422 | return -ENOMEM; | |
423 | ||
5a99444e | 424 | return strv_free_and_replace(client->user_class, s); |
33923925 SS |
425 | } |
426 | ||
019951ec YW |
427 | int sd_dhcp6_client_set_request_vendor_class(sd_dhcp6_client *client, char * const *vendor_class) { |
428 | char * const *p; | |
429 | char **s; | |
73c8ced7 SS |
430 | |
431 | assert_return(client, -EINVAL); | |
6f4490bb | 432 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
019951ec | 433 | assert_return(!strv_isempty(vendor_class), -EINVAL); |
73c8ced7 | 434 | |
019951ec YW |
435 | STRV_FOREACH(p, vendor_class) { |
436 | size_t len = strlen(*p); | |
437 | ||
438 | if (len > UINT16_MAX || len == 0) | |
439 | return -EINVAL; | |
440 | } | |
73c8ced7 SS |
441 | |
442 | s = strv_copy(vendor_class); | |
443 | if (!s) | |
444 | return -ENOMEM; | |
445 | ||
019951ec | 446 | return strv_free_and_replace(client->vendor_class, s); |
73c8ced7 SS |
447 | } |
448 | ||
d8c51121 PF |
449 | int sd_dhcp6_client_get_prefix_delegation(sd_dhcp6_client *client, int *delegation) { |
450 | assert_return(client, -EINVAL); | |
451 | assert_return(delegation, -EINVAL); | |
452 | ||
b261b5f4 | 453 | *delegation = FLAGS_SET(client->request_ia, DHCP6_REQUEST_IA_PD); |
d8c51121 PF |
454 | |
455 | return 0; | |
456 | } | |
457 | ||
458 | int sd_dhcp6_client_set_prefix_delegation(sd_dhcp6_client *client, int delegation) { | |
7c3de8f8 | 459 | assert_return(client, -EINVAL); |
6f4490bb | 460 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
7c3de8f8 | 461 | |
b261b5f4 | 462 | SET_FLAG(client->request_ia, DHCP6_REQUEST_IA_PD, delegation); |
f311a62b PF |
463 | |
464 | return 0; | |
465 | } | |
466 | ||
467 | int sd_dhcp6_client_get_address_request(sd_dhcp6_client *client, int *request) { | |
468 | assert_return(client, -EINVAL); | |
469 | assert_return(request, -EINVAL); | |
470 | ||
b261b5f4 | 471 | *request = FLAGS_SET(client->request_ia, DHCP6_REQUEST_IA_NA); |
f311a62b PF |
472 | |
473 | return 0; | |
474 | } | |
475 | ||
476 | int sd_dhcp6_client_set_address_request(sd_dhcp6_client *client, int request) { | |
477 | assert_return(client, -EINVAL); | |
6f4490bb | 478 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
f311a62b | 479 | |
b261b5f4 | 480 | SET_FLAG(client->request_ia, DHCP6_REQUEST_IA_NA, request); |
7c3de8f8 PF |
481 | |
482 | return 0; | |
483 | } | |
484 | ||
6f3fc861 YW |
485 | int dhcp6_client_set_transaction_id(sd_dhcp6_client *client, uint32_t transaction_id) { |
486 | assert(client); | |
487 | assert(client->test_mode); | |
488 | ||
489 | /* This is for tests or fuzzers. */ | |
d89a400e | 490 | |
6f3fc861 | 491 | client->transaction_id = transaction_id & htobe32(0x00ffffff); |
d89a400e EV |
492 | |
493 | return 0; | |
494 | } | |
495 | ||
ea3b3a75 PF |
496 | int sd_dhcp6_client_get_lease(sd_dhcp6_client *client, sd_dhcp6_lease **ret) { |
497 | assert_return(client, -EINVAL); | |
ea3b3a75 PF |
498 | |
499 | if (!client->lease) | |
500 | return -ENOMSG; | |
501 | ||
3098562c TG |
502 | if (ret) |
503 | *ret = client->lease; | |
ea3b3a75 PF |
504 | |
505 | return 0; | |
506 | } | |
507 | ||
e7d5fe17 AD |
508 | int sd_dhcp6_client_add_option(sd_dhcp6_client *client, sd_dhcp6_option *v) { |
509 | int r; | |
510 | ||
511 | assert_return(client, -EINVAL); | |
512 | assert_return(v, -EINVAL); | |
513 | ||
02288f3e | 514 | r = ordered_hashmap_ensure_put(&client->extra_options, &dhcp6_option_hash_ops, UINT_TO_PTR(v->option), v); |
e7d5fe17 AD |
515 | if (r < 0) |
516 | return r; | |
517 | ||
518 | sd_dhcp6_option_ref(v); | |
519 | return 0; | |
520 | } | |
521 | ||
65b85f23 YW |
522 | static void client_set_state(sd_dhcp6_client *client, DHCP6State state) { |
523 | assert(client); | |
524 | ||
525 | if (client->state == state) | |
526 | return; | |
527 | ||
528 | log_dhcp6_client(client, "State changed: %s -> %s", | |
529 | dhcp6_state_to_string(client->state), dhcp6_state_to_string(state)); | |
530 | ||
531 | client->state = state; | |
532 | } | |
533 | ||
3f0c075f | 534 | static void client_notify(sd_dhcp6_client *client, int event) { |
45aa74c7 LP |
535 | assert(client); |
536 | ||
537 | if (client->callback) | |
538 | client->callback(client, event, client->userdata); | |
139b011a PF |
539 | } |
540 | ||
af2b4841 YW |
541 | static void client_stop(sd_dhcp6_client *client, int error) { |
542 | DHCP6_CLIENT_DONT_DESTROY(client); | |
f8908727 | 543 | |
af2b4841 | 544 | assert(client); |
4e3e6679 | 545 | |
af2b4841 | 546 | client_notify(client, error); |
a9aff361 | 547 | |
af2b4841 | 548 | client->lease = sd_dhcp6_lease_unref(client->lease); |
d1b0afe3 | 549 | |
dd73db78 YW |
550 | /* Reset IRT here. Otherwise, we cannot restart the client in the information requesting mode, |
551 | * even though the lease is freed below. */ | |
552 | client->information_request_time_usec = 0; | |
553 | client->information_refresh_time_usec = 0; | |
554 | ||
8ef959cd | 555 | (void) event_source_disable(client->receive_message); |
c9393e8c | 556 | (void) event_source_disable(client->timeout_resend); |
3bb18e70 | 557 | (void) event_source_disable(client->timeout_expire); |
c9393e8c YW |
558 | (void) event_source_disable(client->timeout_t1); |
559 | (void) event_source_disable(client->timeout_t2); | |
213e759a | 560 | |
65b85f23 | 561 | client_set_state(client, DHCP6_STATE_STOPPED); |
139b011a PF |
562 | } |
563 | ||
5e4d135c YW |
564 | static int client_append_common_options_in_managed_mode( |
565 | sd_dhcp6_client *client, | |
566 | uint8_t **opt, | |
567 | size_t *optlen, | |
568 | const DHCP6IA *ia_na, | |
877bfc78 | 569 | const DHCP6IA *ia_pd) { |
5e4d135c YW |
570 | |
571 | int r; | |
572 | ||
573 | assert(client); | |
574 | assert(IN_SET(client->state, | |
575 | DHCP6_STATE_SOLICITATION, | |
576 | DHCP6_STATE_REQUEST, | |
577 | DHCP6_STATE_RENEW, | |
578 | DHCP6_STATE_REBIND)); | |
579 | assert(opt); | |
580 | assert(optlen); | |
581 | ||
582 | if (FLAGS_SET(client->request_ia, DHCP6_REQUEST_IA_NA) && ia_na) { | |
583 | r = dhcp6_option_append_ia(opt, optlen, ia_na); | |
584 | if (r < 0) | |
585 | return r; | |
586 | } | |
587 | ||
588 | if (FLAGS_SET(client->request_ia, DHCP6_REQUEST_IA_PD) && ia_pd) { | |
29858a0f | 589 | r = dhcp6_option_append_ia(opt, optlen, ia_pd); |
5e4d135c YW |
590 | if (r < 0) |
591 | return r; | |
592 | } | |
593 | ||
594 | if (client->fqdn) { | |
595 | r = dhcp6_option_append_fqdn(opt, optlen, client->fqdn); | |
596 | if (r < 0) | |
597 | return r; | |
598 | } | |
599 | ||
600 | if (client->user_class) { | |
601 | r = dhcp6_option_append_user_class(opt, optlen, client->user_class); | |
602 | if (r < 0) | |
603 | return r; | |
604 | } | |
605 | ||
606 | if (client->vendor_class) { | |
607 | r = dhcp6_option_append_vendor_class(opt, optlen, client->vendor_class); | |
608 | if (r < 0) | |
609 | return r; | |
610 | } | |
611 | ||
9e4dee4c | 612 | if (!ordered_set_isempty(client->vendor_options)) { |
5e4d135c YW |
613 | r = dhcp6_option_append_vendor_option(opt, optlen, client->vendor_options); |
614 | if (r < 0) | |
615 | return r; | |
616 | } | |
617 | ||
618 | return 0; | |
619 | } | |
620 | ||
621 | static DHCP6MessageType client_message_type_from_state(sd_dhcp6_client *client) { | |
622 | assert(client); | |
623 | ||
624 | switch (client->state) { | |
625 | case DHCP6_STATE_INFORMATION_REQUEST: | |
626 | return DHCP6_MESSAGE_INFORMATION_REQUEST; | |
627 | case DHCP6_STATE_SOLICITATION: | |
628 | return DHCP6_MESSAGE_SOLICIT; | |
629 | case DHCP6_STATE_REQUEST: | |
630 | return DHCP6_MESSAGE_REQUEST; | |
631 | case DHCP6_STATE_RENEW: | |
632 | return DHCP6_MESSAGE_RENEW; | |
633 | case DHCP6_STATE_REBIND: | |
634 | return DHCP6_MESSAGE_REBIND; | |
635 | default: | |
6f4490bb | 636 | assert_not_reached(); |
5e4d135c YW |
637 | } |
638 | } | |
639 | ||
ec7baf99 | 640 | static int client_send_message(sd_dhcp6_client *client) { |
a9aff361 PF |
641 | _cleanup_free_ DHCP6Message *message = NULL; |
642 | struct in6_addr all_servers = | |
643 | IN6ADDR_ALL_DHCP6_RELAY_AGENTS_AND_SERVERS_INIT; | |
e7d5fe17 | 644 | struct sd_dhcp6_option *j; |
a9aff361 PF |
645 | size_t len, optlen = 512; |
646 | uint8_t *opt; | |
ec7baf99 | 647 | usec_t elapsed_usec, time_now; |
346e13a2 | 648 | be16_t elapsed_time; |
5e4d135c | 649 | int r; |
a9aff361 | 650 | |
a1140666 | 651 | assert(client); |
ec7baf99 YW |
652 | assert(client->event); |
653 | ||
654 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); | |
655 | if (r < 0) | |
656 | return r; | |
a1140666 | 657 | |
a9aff361 PF |
658 | len = sizeof(DHCP6Message) + optlen; |
659 | ||
660 | message = malloc0(len); | |
661 | if (!message) | |
662 | return -ENOMEM; | |
663 | ||
664 | opt = (uint8_t *)(message + 1); | |
665 | ||
666 | message->transaction_id = client->transaction_id; | |
6f4490bb | 667 | message->type = client_message_type_from_state(client); |
de8d6e55 | 668 | |
5e4d135c YW |
669 | switch (client->state) { |
670 | case DHCP6_STATE_INFORMATION_REQUEST: | |
bbfa43ca PF |
671 | break; |
672 | ||
a9aff361 | 673 | case DHCP6_STATE_SOLICITATION: |
5e4d135c | 674 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_RAPID_COMMIT, 0, NULL); |
926695f1 TA |
675 | if (r < 0) |
676 | return r; | |
ed6ee219 | 677 | |
877bfc78 YW |
678 | r = client_append_common_options_in_managed_mode(client, &opt, &optlen, |
679 | &client->ia_na, &client->ia_pd); | |
5e4d135c YW |
680 | if (r < 0) |
681 | return r; | |
7246333c PF |
682 | break; |
683 | ||
684 | case DHCP6_STATE_REQUEST: | |
3dc34fcc PF |
685 | case DHCP6_STATE_RENEW: |
686 | ||
2c1ab8ca | 687 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_SERVERID, |
7246333c PF |
688 | client->lease->serverid_len, |
689 | client->lease->serverid); | |
690 | if (r < 0) | |
691 | return r; | |
692 | ||
5e4d135c | 693 | _fallthrough_; |
3dc34fcc | 694 | case DHCP6_STATE_REBIND: |
3dc34fcc | 695 | |
5e4d135c | 696 | assert(client->lease); |
7c3de8f8 | 697 | |
5e4d135c | 698 | r = client_append_common_options_in_managed_mode(client, &opt, &optlen, |
877bfc78 | 699 | client->lease->ia_na, client->lease->ia_pd); |
5e4d135c YW |
700 | if (r < 0) |
701 | return r; | |
3dc34fcc PF |
702 | break; |
703 | ||
a9aff361 | 704 | case DHCP6_STATE_STOPPED: |
a34b57c0 | 705 | case DHCP6_STATE_BOUND: |
dd5e9378 YW |
706 | default: |
707 | assert_not_reached(); | |
a9aff361 PF |
708 | } |
709 | ||
5e4d135c YW |
710 | if (client->mudurl) { |
711 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_MUD_URL_V6, | |
712 | strlen(client->mudurl), client->mudurl); | |
713 | if (r < 0) | |
714 | return r; | |
715 | } | |
716 | ||
2c1ab8ca | 717 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_ORO, |
da6fe470 PF |
718 | client->req_opts_len * sizeof(be16_t), |
719 | client->req_opts); | |
720 | if (r < 0) | |
721 | return r; | |
722 | ||
ccd1fc2f | 723 | assert(client->duid_len); |
2c1ab8ca | 724 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_CLIENTID, |
66eac120 | 725 | client->duid_len, &client->duid); |
7246333c PF |
726 | if (r < 0) |
727 | return r; | |
728 | ||
bbe3f62a YW |
729 | ORDERED_HASHMAP_FOREACH(j, client->extra_options) { |
730 | r = dhcp6_option_append(&opt, &optlen, j->option, j->length, j->data); | |
731 | if (r < 0) | |
732 | return r; | |
733 | } | |
734 | ||
aa5a0f95 YW |
735 | /* RFC 8415 Section 21.9. |
736 | * A client MUST include an Elapsed Time option in messages to indicate how long the client has | |
737 | * been trying to complete a DHCP message exchange. */ | |
738 | elapsed_usec = MIN(usec_sub_unsigned(time_now, client->transaction_start) / USEC_PER_MSEC / 10, (usec_t) UINT16_MAX); | |
739 | elapsed_time = htobe16(elapsed_usec); | |
740 | r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_ELAPSED_TIME, sizeof(elapsed_time), &elapsed_time); | |
346e13a2 PF |
741 | if (r < 0) |
742 | return r; | |
743 | ||
a9aff361 PF |
744 | r = dhcp6_network_send_udp_socket(client->fd, &all_servers, message, |
745 | len - optlen); | |
746 | if (r < 0) | |
747 | return r; | |
748 | ||
749 | log_dhcp6_client(client, "Sent %s", | |
750 | dhcp6_message_type_to_string(message->type)); | |
751 | ||
752 | return 0; | |
753 | } | |
754 | ||
cc518482 YW |
755 | static usec_t client_timeout_compute_random(usec_t val) { |
756 | return usec_sub_unsigned(val, random_u64_range(val / 10)); | |
757 | } | |
758 | ||
c50c9e50 YW |
759 | static int client_timeout_resend(sd_event_source *s, uint64_t usec, void *userdata) { |
760 | sd_dhcp6_client *client = ASSERT_PTR(userdata); | |
761 | usec_t init_retransmit_time, max_retransmit_time; | |
762 | int r; | |
763 | ||
c50c9e50 YW |
764 | assert(client->event); |
765 | ||
766 | switch (client->state) { | |
767 | case DHCP6_STATE_INFORMATION_REQUEST: | |
768 | init_retransmit_time = DHCP6_INF_TIMEOUT; | |
769 | max_retransmit_time = DHCP6_INF_MAX_RT; | |
770 | break; | |
771 | ||
772 | case DHCP6_STATE_SOLICITATION: | |
773 | ||
774 | if (client->retransmit_count > 0 && client->lease) { | |
e5d69be2 | 775 | (void) client_start_transaction(client, DHCP6_STATE_REQUEST); |
c50c9e50 YW |
776 | return 0; |
777 | } | |
778 | ||
779 | init_retransmit_time = DHCP6_SOL_TIMEOUT; | |
780 | max_retransmit_time = DHCP6_SOL_MAX_RT; | |
781 | break; | |
782 | ||
783 | case DHCP6_STATE_REQUEST: | |
784 | ||
785 | if (client->retransmit_count >= DHCP6_REQ_MAX_RC) { | |
786 | client_stop(client, SD_DHCP6_CLIENT_EVENT_RETRANS_MAX); | |
787 | return 0; | |
788 | } | |
789 | ||
790 | init_retransmit_time = DHCP6_REQ_TIMEOUT; | |
791 | max_retransmit_time = DHCP6_REQ_MAX_RT; | |
792 | break; | |
793 | ||
794 | case DHCP6_STATE_RENEW: | |
795 | init_retransmit_time = DHCP6_REN_TIMEOUT; | |
796 | max_retransmit_time = DHCP6_REN_MAX_RT; | |
797 | ||
798 | /* RFC 3315, section 18.1.3. says max retransmit duration will | |
799 | be the remaining time until T2. Instead of setting MRD, | |
800 | wait for T2 to trigger with the same end result */ | |
801 | break; | |
802 | ||
803 | case DHCP6_STATE_REBIND: | |
804 | init_retransmit_time = DHCP6_REB_TIMEOUT; | |
805 | max_retransmit_time = DHCP6_REB_MAX_RT; | |
806 | ||
807 | /* Also, instead of setting MRD, the expire timer is already set in client_enter_bound_state(). */ | |
808 | break; | |
809 | ||
810 | case DHCP6_STATE_STOPPED: | |
811 | case DHCP6_STATE_BOUND: | |
812 | default: | |
813 | assert_not_reached(); | |
814 | } | |
815 | ||
816 | r = client_send_message(client); | |
817 | if (r >= 0) | |
818 | client->retransmit_count++; | |
819 | ||
820 | if (client->retransmit_time == 0) { | |
821 | client->retransmit_time = client_timeout_compute_random(init_retransmit_time); | |
822 | ||
823 | if (client->state == DHCP6_STATE_SOLICITATION) | |
824 | client->retransmit_time += init_retransmit_time / 10; | |
825 | ||
826 | } else if (client->retransmit_time > max_retransmit_time / 2) | |
827 | client->retransmit_time = client_timeout_compute_random(max_retransmit_time); | |
828 | else | |
829 | client->retransmit_time += client_timeout_compute_random(client->retransmit_time); | |
830 | ||
831 | log_dhcp6_client(client, "Next retransmission in %s", | |
832 | FORMAT_TIMESPAN(client->retransmit_time, USEC_PER_SEC)); | |
833 | ||
834 | r = event_reset_time_relative(client->event, &client->timeout_resend, | |
835 | clock_boottime_or_monotonic(), | |
836 | client->retransmit_time, 10 * USEC_PER_MSEC, | |
837 | client_timeout_resend, client, | |
838 | client->event_priority, "dhcp6-resend-timer", true); | |
839 | if (r < 0) | |
840 | client_stop(client, r); | |
841 | ||
842 | return 0; | |
843 | } | |
844 | ||
e5d69be2 | 845 | static int client_start_transaction(sd_dhcp6_client *client, DHCP6State state) { |
c50c9e50 YW |
846 | int r; |
847 | ||
6f4490bb YW |
848 | assert(client); |
849 | assert(client->event); | |
c50c9e50 YW |
850 | |
851 | switch (state) { | |
852 | case DHCP6_STATE_INFORMATION_REQUEST: | |
853 | case DHCP6_STATE_SOLICITATION: | |
854 | assert(client->state == DHCP6_STATE_STOPPED); | |
855 | break; | |
856 | case DHCP6_STATE_REQUEST: | |
857 | assert(client->state == DHCP6_STATE_SOLICITATION); | |
858 | break; | |
859 | case DHCP6_STATE_RENEW: | |
860 | assert(client->state == DHCP6_STATE_BOUND); | |
861 | break; | |
862 | case DHCP6_STATE_REBIND: | |
863 | assert(IN_SET(client->state, DHCP6_STATE_BOUND, DHCP6_STATE_RENEW)); | |
864 | break; | |
865 | case DHCP6_STATE_STOPPED: | |
866 | case DHCP6_STATE_BOUND: | |
867 | default: | |
868 | assert_not_reached(); | |
869 | } | |
870 | ||
65b85f23 YW |
871 | client_set_state(client, state); |
872 | ||
c50c9e50 YW |
873 | client->retransmit_time = 0; |
874 | client->retransmit_count = 0; | |
875 | client->transaction_id = random_u32() & htobe32(0x00ffffff); | |
876 | ||
877 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &client->transaction_start); | |
878 | if (r < 0) | |
879 | goto error; | |
880 | ||
881 | r = event_reset_time(client->event, &client->timeout_resend, | |
882 | clock_boottime_or_monotonic(), | |
883 | 0, 0, | |
884 | client_timeout_resend, client, | |
885 | client->event_priority, "dhcp6-resend-timeout", true); | |
886 | if (r < 0) | |
887 | goto error; | |
888 | ||
889 | r = sd_event_source_set_enabled(client->receive_message, SD_EVENT_ON); | |
890 | if (r < 0) | |
891 | goto error; | |
892 | ||
893 | return 0; | |
894 | ||
895 | error: | |
896 | client_stop(client, r); | |
897 | return r; | |
898 | } | |
899 | ||
3bb18e70 | 900 | static int client_timeout_expire(sd_event_source *s, uint64_t usec, void *userdata) { |
6f4490bb | 901 | sd_dhcp6_client *client = ASSERT_PTR(userdata); |
3bb18e70 YW |
902 | DHCP6_CLIENT_DONT_DESTROY(client); |
903 | DHCP6State state; | |
904 | ||
3bb18e70 YW |
905 | (void) event_source_disable(client->timeout_expire); |
906 | (void) event_source_disable(client->timeout_t2); | |
907 | (void) event_source_disable(client->timeout_t1); | |
908 | ||
909 | state = client->state; | |
910 | ||
911 | client_stop(client, SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE); | |
912 | ||
913 | /* RFC 3315, section 18.1.4., says that "...the client may choose to | |
914 | use a Solicit message to locate a new DHCP server..." */ | |
915 | if (state == DHCP6_STATE_REBIND) | |
e5d69be2 | 916 | (void) client_start_transaction(client, DHCP6_STATE_SOLICITATION); |
3bb18e70 YW |
917 | |
918 | return 0; | |
919 | } | |
920 | ||
4b558378 | 921 | static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) { |
6f4490bb | 922 | sd_dhcp6_client *client = ASSERT_PTR(userdata); |
a34b57c0 | 923 | |
c9393e8c | 924 | (void) event_source_disable(client->timeout_t2); |
220a88ca | 925 | (void) event_source_disable(client->timeout_t1); |
a34b57c0 PF |
926 | |
927 | log_dhcp6_client(client, "Timeout T2"); | |
928 | ||
e5d69be2 | 929 | (void) client_start_transaction(client, DHCP6_STATE_REBIND); |
3dc34fcc | 930 | |
a34b57c0 PF |
931 | return 0; |
932 | } | |
933 | ||
4b558378 | 934 | static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) { |
6f4490bb | 935 | sd_dhcp6_client *client = ASSERT_PTR(userdata); |
a34b57c0 | 936 | |
c9393e8c | 937 | (void) event_source_disable(client->timeout_t1); |
a34b57c0 PF |
938 | |
939 | log_dhcp6_client(client, "Timeout T1"); | |
940 | ||
e5d69be2 | 941 | (void) client_start_transaction(client, DHCP6_STATE_RENEW); |
3dc34fcc | 942 | |
a34b57c0 PF |
943 | return 0; |
944 | } | |
945 | ||
02354ee7 | 946 | static int client_enter_bound_state(sd_dhcp6_client *client) { |
3bb18e70 | 947 | usec_t lifetime_t1, lifetime_t2, lifetime_valid; |
02354ee7 YW |
948 | int r; |
949 | ||
950 | assert(client); | |
951 | assert(client->lease); | |
952 | assert(IN_SET(client->state, | |
953 | DHCP6_STATE_SOLICITATION, | |
954 | DHCP6_STATE_REQUEST, | |
955 | DHCP6_STATE_RENEW, | |
956 | DHCP6_STATE_REBIND)); | |
957 | ||
6f8ff342 | 958 | (void) event_source_disable(client->receive_message); |
02354ee7 YW |
959 | (void) event_source_disable(client->timeout_resend); |
960 | ||
3bb18e70 | 961 | r = dhcp6_lease_get_lifetime(client->lease, &lifetime_t1, &lifetime_t2, &lifetime_valid); |
02354ee7 YW |
962 | if (r < 0) |
963 | goto error; | |
964 | ||
cdf3d8c5 YW |
965 | lifetime_t2 = client_timeout_compute_random(lifetime_t2); |
966 | lifetime_t1 = client_timeout_compute_random(MIN(lifetime_t1, lifetime_t2)); | |
02354ee7 | 967 | |
cdf3d8c5 YW |
968 | if (lifetime_t1 == USEC_INFINITY) { |
969 | log_dhcp6_client(client, "Infinite T1"); | |
970 | event_source_disable(client->timeout_t1); | |
971 | } else { | |
972 | log_dhcp6_client(client, "T1 expires in %s", FORMAT_TIMESPAN(lifetime_t1, USEC_PER_SEC)); | |
973 | r = event_reset_time_relative(client->event, &client->timeout_t1, | |
974 | clock_boottime_or_monotonic(), | |
975 | lifetime_t1, 10 * USEC_PER_SEC, | |
976 | client_timeout_t1, client, | |
977 | client->event_priority, "dhcp6-t1-timeout", true); | |
978 | if (r < 0) | |
979 | goto error; | |
980 | } | |
02354ee7 | 981 | |
cdf3d8c5 YW |
982 | if (lifetime_t2 == USEC_INFINITY) { |
983 | log_dhcp6_client(client, "Infinite T2"); | |
984 | event_source_disable(client->timeout_t2); | |
985 | } else { | |
986 | log_dhcp6_client(client, "T2 expires in %s", FORMAT_TIMESPAN(lifetime_t2, USEC_PER_SEC)); | |
987 | r = event_reset_time_relative(client->event, &client->timeout_t2, | |
988 | clock_boottime_or_monotonic(), | |
989 | lifetime_t2, 10 * USEC_PER_SEC, | |
990 | client_timeout_t2, client, | |
991 | client->event_priority, "dhcp6-t2-timeout", true); | |
992 | if (r < 0) | |
993 | goto error; | |
994 | } | |
02354ee7 | 995 | |
3bb18e70 YW |
996 | if (lifetime_valid == USEC_INFINITY) { |
997 | log_dhcp6_client(client, "Infinite valid lifetime"); | |
998 | event_source_disable(client->timeout_expire); | |
999 | } else { | |
1000 | log_dhcp6_client(client, "Valid lifetime expires in %s", FORMAT_TIMESPAN(lifetime_valid, USEC_PER_SEC)); | |
1001 | ||
1002 | r = event_reset_time_relative(client->event, &client->timeout_expire, | |
1003 | clock_boottime_or_monotonic(), | |
1004 | lifetime_valid, USEC_PER_SEC, | |
1005 | client_timeout_expire, client, | |
1006 | client->event_priority, "dhcp6-lease-expire", true); | |
1007 | if (r < 0) | |
1008 | goto error; | |
1009 | } | |
1010 | ||
65b85f23 | 1011 | client_set_state(client, DHCP6_STATE_BOUND); |
c41bdb17 | 1012 | client_notify(client, SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE); |
02354ee7 YW |
1013 | return 0; |
1014 | ||
1015 | error: | |
1016 | client_stop(client, r); | |
1017 | return r; | |
1018 | } | |
1019 | ||
07a3b340 YW |
1020 | static int log_invalid_message_type(sd_dhcp6_client *client, const DHCP6Message *message) { |
1021 | const char *type_str; | |
1022 | ||
1023 | assert(client); | |
1024 | assert(message); | |
1025 | ||
1026 | type_str = dhcp6_message_type_to_string(message->type); | |
1027 | if (type_str) | |
1028 | return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), | |
1029 | "Received unexpected %s message, ignoring.", type_str); | |
1030 | else | |
1031 | return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), | |
1032 | "Received unsupported message type %u, ignoring.", message->type); | |
1033 | } | |
1034 | ||
1035 | static int client_process_information( | |
ef4edc15 | 1036 | sd_dhcp6_client *client, |
65ece4c8 | 1037 | DHCP6Message *message, |
ef4edc15 | 1038 | size_t len, |
65ece4c8 | 1039 | const triple_timestamp *timestamp, |
ef4edc15 YW |
1040 | const struct in6_addr *server_address) { |
1041 | ||
4afd3348 | 1042 | _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; |
a1140666 LP |
1043 | int r; |
1044 | ||
6f4490bb YW |
1045 | assert(client); |
1046 | assert(message); | |
1047 | ||
65ece4c8 | 1048 | if (message->type != DHCP6_MESSAGE_REPLY) |
07a3b340 | 1049 | return log_invalid_message_type(client, message); |
a34b57c0 | 1050 | |
65ece4c8 | 1051 | r = dhcp6_lease_new_from_message(client, message, len, timestamp, server_address, &lease); |
a34b57c0 | 1052 | if (r < 0) |
07a3b340 | 1053 | return log_dhcp6_client_errno(client, r, "Failed to process received reply message, ignoring: %m"); |
a34b57c0 | 1054 | |
cfcc85bb YW |
1055 | log_dhcp6_client(client, "Processed %s message", dhcp6_message_type_to_string(message->type)); |
1056 | ||
07a3b340 YW |
1057 | sd_dhcp6_lease_unref(client->lease); |
1058 | client->lease = TAKE_PTR(lease); | |
ed6ee219 | 1059 | |
6f8ff342 YW |
1060 | /* Do not call client_stop() here, as it frees the acquired lease. */ |
1061 | (void) event_source_disable(client->receive_message); | |
c2c878d8 | 1062 | (void) event_source_disable(client->timeout_resend); |
65b85f23 | 1063 | client_set_state(client, DHCP6_STATE_STOPPED); |
c2c878d8 | 1064 | |
07a3b340 | 1065 | client_notify(client, SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST); |
c2c878d8 | 1066 | return 0; |
07a3b340 YW |
1067 | } |
1068 | ||
1069 | static int client_process_reply( | |
1070 | sd_dhcp6_client *client, | |
1071 | DHCP6Message *message, | |
1072 | size_t len, | |
1073 | const triple_timestamp *timestamp, | |
1074 | const struct in6_addr *server_address) { | |
1075 | ||
1076 | _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; | |
1077 | int r; | |
1078 | ||
1079 | assert(client); | |
1080 | assert(message); | |
1081 | ||
1082 | if (message->type != DHCP6_MESSAGE_REPLY) | |
1083 | return log_invalid_message_type(client, message); | |
1084 | ||
1085 | r = dhcp6_lease_new_from_message(client, message, len, timestamp, server_address, &lease); | |
1086 | if (r < 0) | |
1087 | return log_dhcp6_client_errno(client, r, "Failed to process received reply message, ignoring: %m"); | |
1088 | ||
cfcc85bb YW |
1089 | log_dhcp6_client(client, "Processed %s message", dhcp6_message_type_to_string(message->type)); |
1090 | ||
431a4bc8 YW |
1091 | sd_dhcp6_lease_unref(client->lease); |
1092 | client->lease = TAKE_PTR(lease); | |
a34b57c0 | 1093 | |
c41bdb17 | 1094 | return client_enter_bound_state(client); |
a34b57c0 PF |
1095 | } |
1096 | ||
07a3b340 | 1097 | static int client_process_advertise_or_rapid_commit_reply( |
ef4edc15 | 1098 | sd_dhcp6_client *client, |
65ece4c8 | 1099 | DHCP6Message *message, |
ef4edc15 | 1100 | size_t len, |
65ece4c8 | 1101 | const triple_timestamp *timestamp, |
ef4edc15 YW |
1102 | const struct in6_addr *server_address) { |
1103 | ||
4afd3348 | 1104 | _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; |
07a3b340 | 1105 | uint8_t pref_advertise, pref_lease = 0; |
a1140666 | 1106 | int r; |
631bbe71 | 1107 | |
653ddc1d | 1108 | assert(client); |
65ece4c8 | 1109 | assert(message); |
653ddc1d | 1110 | |
07a3b340 YW |
1111 | if (!IN_SET(message->type, DHCP6_MESSAGE_ADVERTISE, DHCP6_MESSAGE_REPLY)) |
1112 | return log_invalid_message_type(client, message); | |
631bbe71 | 1113 | |
65ece4c8 | 1114 | r = dhcp6_lease_new_from_message(client, message, len, timestamp, server_address, &lease); |
631bbe71 | 1115 | if (r < 0) |
07a3b340 YW |
1116 | return log_dhcp6_client_errno(client, r, "Failed to process received %s message, ignoring: %m", |
1117 | dhcp6_message_type_to_string(message->type)); | |
1118 | ||
1119 | if (message->type == DHCP6_MESSAGE_REPLY) { | |
1120 | bool rapid_commit; | |
1121 | ||
1122 | r = dhcp6_lease_get_rapid_commit(lease, &rapid_commit); | |
1123 | if (r < 0) | |
1124 | return r; | |
1125 | ||
1126 | if (!rapid_commit) | |
1127 | return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), | |
1128 | "Received reply message without rapid commit flag, ignoring."); | |
1129 | ||
cfcc85bb YW |
1130 | log_dhcp6_client(client, "Processed %s message", dhcp6_message_type_to_string(message->type)); |
1131 | ||
07a3b340 YW |
1132 | sd_dhcp6_lease_unref(client->lease); |
1133 | client->lease = TAKE_PTR(lease); | |
1134 | ||
c41bdb17 | 1135 | return client_enter_bound_state(client); |
07a3b340 | 1136 | } |
631bbe71 PF |
1137 | |
1138 | r = dhcp6_lease_get_preference(lease, &pref_advertise); | |
1139 | if (r < 0) | |
1140 | return r; | |
1141 | ||
049fddfa YW |
1142 | if (client->lease) { |
1143 | r = dhcp6_lease_get_preference(client->lease, &pref_lease); | |
1144 | if (r < 0) | |
1145 | return r; | |
1146 | } | |
bbfa43ca | 1147 | |
cfcc85bb YW |
1148 | log_dhcp6_client(client, "Processed %s message", dhcp6_message_type_to_string(message->type)); |
1149 | ||
049fddfa | 1150 | if (!client->lease || pref_advertise > pref_lease) { |
07a3b340 | 1151 | /* If this is the first advertise message or has higher preference, then save the lease. */ |
431a4bc8 YW |
1152 | sd_dhcp6_lease_unref(client->lease); |
1153 | client->lease = TAKE_PTR(lease); | |
631bbe71 PF |
1154 | } |
1155 | ||
cfcc85bb | 1156 | if (pref_advertise == 255 || client->retransmit_count > 1) |
e5d69be2 | 1157 | (void) client_start_transaction(client, DHCP6_STATE_REQUEST); |
7246333c | 1158 | |
07a3b340 | 1159 | return 0; |
631bbe71 PF |
1160 | } |
1161 | ||
004845d1 LP |
1162 | static int client_receive_message( |
1163 | sd_event_source *s, | |
1164 | int fd, uint32_t | |
1165 | revents, | |
1166 | void *userdata) { | |
1167 | ||
6f4490bb | 1168 | sd_dhcp6_client *client = ASSERT_PTR(userdata); |
3f0c075f | 1169 | DHCP6_CLIENT_DONT_DESTROY(client); |
653ddc1d YW |
1170 | /* This needs to be initialized with zero. See #20741. */ |
1171 | CMSG_BUFFER_TYPE(CMSG_SPACE_TIMEVAL) control = {}; | |
1172 | struct iovec iov; | |
ef4edc15 | 1173 | union sockaddr_union sa = {}; |
653ddc1d | 1174 | struct msghdr msg = { |
ef4edc15 YW |
1175 | .msg_name = &sa.sa, |
1176 | .msg_namelen = sizeof(sa), | |
653ddc1d YW |
1177 | .msg_iov = &iov, |
1178 | .msg_iovlen = 1, | |
1179 | .msg_control = &control, | |
1180 | .msg_controllen = sizeof(control), | |
1181 | }; | |
1182 | struct cmsghdr *cmsg; | |
1183 | triple_timestamp t = {}; | |
0d43d2fc | 1184 | _cleanup_free_ DHCP6Message *message = NULL; |
ef4edc15 | 1185 | struct in6_addr *server_address = NULL; |
4edc2c9b | 1186 | ssize_t buflen, len; |
631bbe71 | 1187 | |
4edc2c9b | 1188 | buflen = next_datagram_size_fd(fd); |
ab8a8a4e YW |
1189 | if (buflen < 0) { |
1190 | if (ERRNO_IS_TRANSIENT(buflen) || ERRNO_IS_DISCONNECT(buflen)) | |
1191 | return 0; | |
1192 | ||
1193 | log_dhcp6_client_errno(client, buflen, "Failed to determine datagram size to read, ignoring: %m"); | |
22a3fd2d | 1194 | return 0; |
ab8a8a4e | 1195 | } |
631bbe71 | 1196 | |
0d43d2fc | 1197 | message = malloc(buflen); |
631bbe71 PF |
1198 | if (!message) |
1199 | return -ENOMEM; | |
1200 | ||
653ddc1d YW |
1201 | iov = IOVEC_MAKE(message, buflen); |
1202 | ||
1203 | len = recvmsg_safe(fd, &msg, MSG_DONTWAIT); | |
0d43d2fc | 1204 | if (len < 0) { |
ab8a8a4e | 1205 | if (ERRNO_IS_TRANSIENT(len) || ERRNO_IS_DISCONNECT(len)) |
0d43d2fc TG |
1206 | return 0; |
1207 | ||
ab8a8a4e YW |
1208 | log_dhcp6_client_errno(client, len, "Could not receive message from UDP socket, ignoring: %m"); |
1209 | return 0; | |
004845d1 LP |
1210 | } |
1211 | if ((size_t) len < sizeof(DHCP6Message)) { | |
1212 | log_dhcp6_client(client, "Too small to be DHCP6 message: ignoring"); | |
631bbe71 | 1213 | return 0; |
004845d1 | 1214 | } |
631bbe71 | 1215 | |
ef4edc15 YW |
1216 | /* msg_namelen == 0 happens when running the test-suite over a socketpair */ |
1217 | if (msg.msg_namelen > 0) { | |
1218 | if (msg.msg_namelen != sizeof(struct sockaddr_in6) || sa.in6.sin6_family != AF_INET6) { | |
1219 | log_dhcp6_client(client, "Received message from invalid source, ignoring."); | |
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | server_address = &sa.in6.sin6_addr; | |
1224 | } | |
1225 | ||
653ddc1d YW |
1226 | CMSG_FOREACH(cmsg, &msg) { |
1227 | if (cmsg->cmsg_level == SOL_SOCKET && | |
1228 | cmsg->cmsg_type == SO_TIMESTAMP && | |
1229 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval))) | |
1230 | triple_timestamp_from_realtime(&t, timeval_load((struct timeval*) CMSG_DATA(cmsg))); | |
1231 | } | |
1232 | ||
d7799877 | 1233 | if (client->transaction_id != (message->transaction_id & htobe32(0x00ffffff))) |
631bbe71 PF |
1234 | return 0; |
1235 | ||
1236 | switch (client->state) { | |
bbfa43ca | 1237 | case DHCP6_STATE_INFORMATION_REQUEST: |
07a3b340 | 1238 | if (client_process_information(client, message, len, &t, server_address) < 0) |
bbfa43ca | 1239 | return 0; |
bbfa43ca PF |
1240 | break; |
1241 | ||
631bbe71 | 1242 | case DHCP6_STATE_SOLICITATION: |
07a3b340 | 1243 | if (client_process_advertise_or_rapid_commit_reply(client, message, len, &t, server_address) < 0) |
d7799877 | 1244 | return 0; |
07a3b340 | 1245 | break; |
631bbe71 | 1246 | |
7246333c | 1247 | case DHCP6_STATE_REQUEST: |
3dc34fcc PF |
1248 | case DHCP6_STATE_RENEW: |
1249 | case DHCP6_STATE_REBIND: | |
07a3b340 | 1250 | if (client_process_reply(client, message, len, &t, server_address) < 0) |
a34b57c0 | 1251 | return 0; |
a34b57c0 PF |
1252 | break; |
1253 | ||
1254 | case DHCP6_STATE_BOUND: | |
631bbe71 | 1255 | case DHCP6_STATE_STOPPED: |
dd5e9378 YW |
1256 | default: |
1257 | assert_not_reached(); | |
631bbe71 PF |
1258 | } |
1259 | ||
a9aff361 PF |
1260 | return 0; |
1261 | } | |
1262 | ||
0ae0e5cd | 1263 | int sd_dhcp6_client_stop(sd_dhcp6_client *client) { |
c8bae363 YW |
1264 | if (!client) |
1265 | return 0; | |
f667c150 | 1266 | |
10c9ce61 | 1267 | client_stop(client, SD_DHCP6_CLIENT_EVENT_STOP); |
139b011a | 1268 | |
8ef959cd | 1269 | client->receive_message = sd_event_source_unref(client->receive_message); |
7ac6c26a PF |
1270 | client->fd = safe_close(client->fd); |
1271 | ||
139b011a PF |
1272 | return 0; |
1273 | } | |
1274 | ||
f667c150 TG |
1275 | int sd_dhcp6_client_is_running(sd_dhcp6_client *client) { |
1276 | assert_return(client, -EINVAL); | |
1277 | ||
1278 | return client->state != DHCP6_STATE_STOPPED; | |
1279 | } | |
1280 | ||
0ae0e5cd | 1281 | int sd_dhcp6_client_start(sd_dhcp6_client *client) { |
dd5e9378 | 1282 | DHCP6State state = DHCP6_STATE_SOLICITATION; |
6d95e7d9 | 1283 | int r; |
139b011a PF |
1284 | |
1285 | assert_return(client, -EINVAL); | |
1286 | assert_return(client->event, -EINVAL); | |
2f8e7633 | 1287 | assert_return(client->ifindex > 0, -EINVAL); |
94876904 | 1288 | assert_return(in6_addr_is_link_local(&client->local_address) > 0, -EINVAL); |
6f4490bb YW |
1289 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
1290 | assert_return(client->information_request || client->request_ia != 0, -EINVAL); | |
f311a62b | 1291 | |
af2b4841 YW |
1292 | /* Even if the client is in the STOPPED state, the lease acquired in the previous information |
1293 | * request may be stored. */ | |
1294 | client->lease = sd_dhcp6_lease_unref(client->lease); | |
f12abb48 | 1295 | |
bbfa43ca PF |
1296 | r = client_ensure_iaid(client); |
1297 | if (r < 0) | |
1298 | return r; | |
1299 | ||
cc22955c TH |
1300 | r = client_ensure_duid(client); |
1301 | if (r < 0) | |
1302 | return r; | |
1303 | ||
10a0f27b PF |
1304 | if (client->fd < 0) { |
1305 | r = dhcp6_network_bind_udp_socket(client->ifindex, &client->local_address); | |
1306 | if (r < 0) { | |
1307 | _cleanup_free_ char *p = NULL; | |
1308 | ||
77712331 | 1309 | (void) in6_addr_to_string(&client->local_address, &p); |
10a0f27b PF |
1310 | return log_dhcp6_client_errno(client, r, |
1311 | "Failed to bind to UDP socket at address %s: %m", strna(p)); | |
1312 | } | |
bd9a7221 | 1313 | |
10a0f27b | 1314 | client->fd = r; |
bd9a7221 | 1315 | } |
bbfa43ca | 1316 | |
8ef959cd YW |
1317 | if (!client->receive_message) { |
1318 | _cleanup_(sd_event_source_disable_unrefp) sd_event_source *s = NULL; | |
1319 | ||
1320 | r = sd_event_add_io(client->event, &s, client->fd, EPOLLIN, client_receive_message, client); | |
1321 | if (r < 0) | |
1322 | return r; | |
1323 | ||
1324 | r = sd_event_source_set_priority(s, client->event_priority); | |
1325 | if (r < 0) | |
1326 | return r; | |
1327 | ||
1328 | r = sd_event_source_set_description(s, "dhcp6-receive-message"); | |
1329 | if (r < 0) | |
1330 | return r; | |
1331 | ||
1332 | client->receive_message = TAKE_PTR(s); | |
1333 | } | |
1334 | ||
fcb51238 YW |
1335 | if (client->information_request) { |
1336 | usec_t t = now(CLOCK_MONOTONIC); | |
1337 | ||
1338 | if (t < usec_add(client->information_request_time_usec, client->information_refresh_time_usec)) | |
1339 | return 0; | |
1340 | ||
1341 | client->information_request_time_usec = t; | |
bbfa43ca | 1342 | state = DHCP6_STATE_INFORMATION_REQUEST; |
fcb51238 | 1343 | } |
bbfa43ca | 1344 | |
65b85f23 | 1345 | log_dhcp6_client(client, "Starting in %s mode", |
787dd704 | 1346 | client->information_request ? "Information request" : "Managed"); |
bbfa43ca | 1347 | |
e5d69be2 | 1348 | return client_start_transaction(client, state); |
139b011a PF |
1349 | } |
1350 | ||
32d20645 | 1351 | int sd_dhcp6_client_attach_event(sd_dhcp6_client *client, sd_event *event, int64_t priority) { |
139b011a PF |
1352 | int r; |
1353 | ||
1354 | assert_return(client, -EINVAL); | |
1355 | assert_return(!client->event, -EBUSY); | |
6f4490bb | 1356 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
139b011a PF |
1357 | |
1358 | if (event) | |
1359 | client->event = sd_event_ref(event); | |
1360 | else { | |
1361 | r = sd_event_default(&client->event); | |
1362 | if (r < 0) | |
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | client->event_priority = priority; | |
1367 | ||
1368 | return 0; | |
1369 | } | |
1370 | ||
1371 | int sd_dhcp6_client_detach_event(sd_dhcp6_client *client) { | |
1372 | assert_return(client, -EINVAL); | |
6f4490bb | 1373 | assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
139b011a PF |
1374 | |
1375 | client->event = sd_event_unref(client->event); | |
1376 | ||
1377 | return 0; | |
1378 | } | |
1379 | ||
1380 | sd_event *sd_dhcp6_client_get_event(sd_dhcp6_client *client) { | |
a1140666 | 1381 | assert_return(client, NULL); |
139b011a PF |
1382 | |
1383 | return client->event; | |
1384 | } | |
1385 | ||
8301aa0b | 1386 | static sd_dhcp6_client *dhcp6_client_free(sd_dhcp6_client *client) { |
6f4490bb YW |
1387 | if (!client) |
1388 | return NULL; | |
139b011a | 1389 | |
d0875a07 | 1390 | sd_dhcp6_lease_unref(client->lease); |
c9393e8c | 1391 | |
d0875a07 YW |
1392 | sd_event_source_disable_unref(client->receive_message); |
1393 | sd_event_source_disable_unref(client->timeout_resend); | |
3bb18e70 | 1394 | sd_event_source_disable_unref(client->timeout_expire); |
d0875a07 YW |
1395 | sd_event_source_disable_unref(client->timeout_t1); |
1396 | sd_event_source_disable_unref(client->timeout_t2); | |
6f4490bb | 1397 | sd_event_unref(client->event); |
3733eec3 | 1398 | |
10a0f27b PF |
1399 | client->fd = safe_close(client->fd); |
1400 | ||
3733eec3 | 1401 | free(client->req_opts); |
8006aa32 | 1402 | free(client->fqdn); |
de8d6e55 | 1403 | free(client->mudurl); |
877bfc78 | 1404 | dhcp6_ia_clear_addresses(&client->ia_pd); |
e7d5fe17 | 1405 | ordered_hashmap_free(client->extra_options); |
9e4dee4c | 1406 | ordered_set_free(client->vendor_options); |
33923925 | 1407 | strv_free(client->user_class); |
73c8ced7 | 1408 | strv_free(client->vendor_class); |
61a9fa8f | 1409 | free(client->ifname); |
33923925 | 1410 | |
6b430fdb | 1411 | return mfree(client); |
139b011a PF |
1412 | } |
1413 | ||
8301aa0b YW |
1414 | DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp6_client, sd_dhcp6_client, dhcp6_client_free); |
1415 | ||
0ae0e5cd | 1416 | int sd_dhcp6_client_new(sd_dhcp6_client **ret) { |
4afd3348 | 1417 | _cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL; |
8b8ecac8 | 1418 | _cleanup_free_ be16_t *req_opts = NULL; |
da6fe470 | 1419 | size_t t; |
139b011a PF |
1420 | |
1421 | assert_return(ret, -EINVAL); | |
1422 | ||
8b8ecac8 YW |
1423 | req_opts = new(be16_t, ELEMENTSOF(default_req_opts)); |
1424 | if (!req_opts) | |
139b011a PF |
1425 | return -ENOMEM; |
1426 | ||
8b8ecac8 YW |
1427 | for (t = 0; t < ELEMENTSOF(default_req_opts); t++) |
1428 | req_opts[t] = htobe16(default_req_opts[t]); | |
c806ffb9 | 1429 | |
8b8ecac8 YW |
1430 | client = new(sd_dhcp6_client, 1); |
1431 | if (!client) | |
da6fe470 PF |
1432 | return -ENOMEM; |
1433 | ||
8b8ecac8 YW |
1434 | *client = (sd_dhcp6_client) { |
1435 | .n_ref = 1, | |
1436 | .ia_na.type = SD_DHCP6_OPTION_IA_NA, | |
1437 | .ia_pd.type = SD_DHCP6_OPTION_IA_PD, | |
1438 | .ifindex = -1, | |
01b4e90f | 1439 | .request_ia = DHCP6_REQUEST_IA_NA | DHCP6_REQUEST_IA_PD, |
8b8ecac8 YW |
1440 | .fd = -1, |
1441 | .req_opts_len = ELEMENTSOF(default_req_opts), | |
1442 | .req_opts = TAKE_PTR(req_opts), | |
1443 | }; | |
da6fe470 | 1444 | |
1cc6c93a | 1445 | *ret = TAKE_PTR(client); |
139b011a PF |
1446 | |
1447 | return 0; | |
1448 | } |