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d5ebcf65 YW |
1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
2 | ||
557e1b52 YW |
3 | #include <linux/ipv6_route.h> |
4 | ||
d8ec95c7 | 5 | #include "dhcp6-lease-internal.h" |
d5ebcf65 YW |
6 | #include "hashmap.h" |
7 | #include "in-addr-prefix-util.h" | |
8 | #include "networkd-address-generation.h" | |
9 | #include "networkd-address.h" | |
10 | #include "networkd-dhcp-prefix-delegation.h" | |
11 | #include "networkd-dhcp6.h" | |
12 | #include "networkd-link.h" | |
13 | #include "networkd-manager.h" | |
14 | #include "networkd-queue.h" | |
15 | #include "networkd-radv.h" | |
16 | #include "networkd-route.h" | |
e49bad01 | 17 | #include "networkd-setlink.h" |
d5ebcf65 YW |
18 | #include "parse-util.h" |
19 | #include "string-util.h" | |
20 | #include "strv.h" | |
e49bad01 | 21 | #include "tunnel.h" |
d5ebcf65 | 22 | |
a27588d4 | 23 | bool link_dhcp_pd_is_enabled(Link *link) { |
d5ebcf65 YW |
24 | assert(link); |
25 | ||
26 | if (!link->network) | |
27 | return false; | |
28 | ||
a27588d4 | 29 | return link->network->dhcp_pd; |
d5ebcf65 YW |
30 | } |
31 | ||
a27588d4 | 32 | bool dhcp_pd_is_uplink(Link *link, Link *target, bool accept_auto) { |
d5ebcf65 YW |
33 | assert(link); |
34 | assert(target); | |
35 | ||
a27588d4 | 36 | if (!link_dhcp_pd_is_enabled(link)) |
d5ebcf65 YW |
37 | return false; |
38 | ||
a27588d4 YW |
39 | if (link->network->dhcp_pd_uplink_name) |
40 | return streq_ptr(target->ifname, link->network->dhcp_pd_uplink_name) || | |
41 | strv_contains(target->alternative_names, link->network->dhcp_pd_uplink_name); | |
d5ebcf65 | 42 | |
a27588d4 YW |
43 | if (link->network->dhcp_pd_uplink_index > 0) |
44 | return target->ifindex == link->network->dhcp_pd_uplink_index; | |
d5ebcf65 | 45 | |
a27588d4 | 46 | if (link->network->dhcp_pd_uplink_index == UPLINK_INDEX_SELF) |
d5ebcf65 YW |
47 | return link == target; |
48 | ||
a27588d4 | 49 | assert(link->network->dhcp_pd_uplink_index == UPLINK_INDEX_AUTO); |
d5ebcf65 YW |
50 | return accept_auto; |
51 | } | |
52 | ||
a27588d4 | 53 | static void link_remove_dhcp_pd_subnet_prefix(Link *link, const struct in6_addr *prefix) { |
d5ebcf65 YW |
54 | void *key; |
55 | ||
56 | assert(link); | |
57 | assert(link->manager); | |
58 | assert(prefix); | |
59 | ||
a27588d4 | 60 | if (hashmap_get(link->manager->links_by_dhcp_pd_subnet_prefix, prefix) != link) |
d5ebcf65 YW |
61 | return; |
62 | ||
a27588d4 | 63 | hashmap_remove2(link->manager->links_by_dhcp_pd_subnet_prefix, prefix, &key); |
d5ebcf65 YW |
64 | free(key); |
65 | } | |
66 | ||
a27588d4 | 67 | static int link_add_dhcp_pd_subnet_prefix(Link *link, const struct in6_addr *prefix) { |
d5ebcf65 YW |
68 | _cleanup_free_ struct in6_addr *copy = NULL; |
69 | int r; | |
70 | ||
71 | assert(link); | |
72 | assert(prefix); | |
73 | ||
74 | copy = newdup(struct in6_addr, prefix, 1); | |
75 | if (!copy) | |
76 | return -ENOMEM; | |
77 | ||
a27588d4 | 78 | r = hashmap_ensure_put(&link->manager->links_by_dhcp_pd_subnet_prefix, &in6_addr_hash_ops_free, copy, link); |
d5ebcf65 YW |
79 | if (r < 0) |
80 | return r; | |
81 | if (r > 0) | |
82 | TAKE_PTR(copy); | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
a27588d4 | 87 | static int link_get_by_dhcp_pd_subnet_prefix(Manager *manager, const struct in6_addr *prefix, Link **ret) { |
d5ebcf65 YW |
88 | Link *link; |
89 | ||
90 | assert(manager); | |
91 | assert(prefix); | |
92 | ||
a27588d4 | 93 | link = hashmap_get(manager->links_by_dhcp_pd_subnet_prefix, prefix); |
d5ebcf65 YW |
94 | if (!link) |
95 | return -ENODEV; | |
96 | ||
97 | if (ret) | |
98 | *ret = link; | |
99 | return 0; | |
100 | } | |
101 | ||
a27588d4 | 102 | static int dhcp_pd_get_assigned_subnet_prefix(Link *link, const struct in6_addr *pd_prefix, uint8_t pd_prefix_len, struct in6_addr *ret) { |
d5ebcf65 YW |
103 | assert(link); |
104 | assert(pd_prefix); | |
105 | ||
a27588d4 | 106 | if (!link_dhcp_pd_is_enabled(link)) |
d5ebcf65 YW |
107 | return -ENOENT; |
108 | ||
a27588d4 | 109 | if (link->network->dhcp_pd_assign) { |
d5ebcf65 YW |
110 | Address *address; |
111 | ||
112 | SET_FOREACH(address, link->addresses) { | |
a27588d4 | 113 | if (address->source != NETWORK_CONFIG_SOURCE_DHCP_PD) |
d5ebcf65 YW |
114 | continue; |
115 | assert(address->family == AF_INET6); | |
116 | ||
117 | if (in6_addr_prefix_covers(pd_prefix, pd_prefix_len, &address->in_addr.in6) <= 0) | |
118 | continue; | |
119 | ||
120 | if (ret) { | |
121 | struct in6_addr prefix = address->in_addr.in6; | |
122 | ||
123 | in6_addr_mask(&prefix, 64); | |
124 | *ret = prefix; | |
125 | } | |
126 | return 0; | |
127 | } | |
128 | } else { | |
129 | Route *route; | |
130 | ||
131 | SET_FOREACH(route, link->routes) { | |
a27588d4 | 132 | if (route->source != NETWORK_CONFIG_SOURCE_DHCP_PD) |
d5ebcf65 YW |
133 | continue; |
134 | assert(route->family == AF_INET6); | |
135 | ||
136 | if (in6_addr_prefix_covers(pd_prefix, pd_prefix_len, &route->dst.in6) > 0) { | |
137 | if (ret) | |
138 | *ret = route->dst.in6; | |
139 | return 0; | |
140 | } | |
141 | } | |
142 | } | |
143 | ||
144 | return -ENOENT; | |
145 | } | |
146 | ||
a27588d4 | 147 | int dhcp_pd_remove(Link *link, bool only_marked) { |
372acaad | 148 | int ret = 0; |
d5ebcf65 YW |
149 | |
150 | assert(link); | |
151 | assert(link->manager); | |
152 | ||
a27588d4 | 153 | if (!link_dhcp_pd_is_enabled(link)) |
d5ebcf65 YW |
154 | return 0; |
155 | ||
156 | if (!only_marked) | |
a27588d4 | 157 | link->dhcp_pd_configured = false; |
d5ebcf65 | 158 | |
a27588d4 | 159 | if (!link->network->dhcp_pd_assign) { |
d5ebcf65 YW |
160 | Route *route; |
161 | ||
162 | SET_FOREACH(route, link->routes) { | |
a27588d4 | 163 | if (route->source != NETWORK_CONFIG_SOURCE_DHCP_PD) |
d5ebcf65 YW |
164 | continue; |
165 | if (only_marked && !route_is_marked(route)) | |
166 | continue; | |
167 | ||
168 | if (link->radv) | |
95931532 | 169 | sd_radv_remove_prefix(link->radv, &route->dst.in6, 64); |
d5ebcf65 | 170 | |
a27588d4 | 171 | link_remove_dhcp_pd_subnet_prefix(link, &route->dst.in6); |
d5ebcf65 | 172 | |
372acaad | 173 | RET_GATHER(ret, route_remove(route)); |
95eb38c8 | 174 | route_cancel_request(route, link); |
d5ebcf65 YW |
175 | } |
176 | } else { | |
177 | Address *address; | |
178 | ||
179 | SET_FOREACH(address, link->addresses) { | |
180 | struct in6_addr prefix; | |
181 | ||
a27588d4 | 182 | if (address->source != NETWORK_CONFIG_SOURCE_DHCP_PD) |
d5ebcf65 YW |
183 | continue; |
184 | if (only_marked && !address_is_marked(address)) | |
185 | continue; | |
186 | ||
187 | prefix = address->in_addr.in6; | |
188 | in6_addr_mask(&prefix, 64); | |
189 | ||
190 | if (link->radv) | |
95931532 | 191 | sd_radv_remove_prefix(link->radv, &prefix, 64); |
d5ebcf65 | 192 | |
a27588d4 | 193 | link_remove_dhcp_pd_subnet_prefix(link, &prefix); |
d5ebcf65 | 194 | |
f22b586a | 195 | RET_GATHER(ret, address_remove_and_cancel(address, link)); |
d5ebcf65 YW |
196 | } |
197 | } | |
198 | ||
372acaad | 199 | return ret; |
d5ebcf65 YW |
200 | } |
201 | ||
a27588d4 | 202 | static int dhcp_pd_check_ready(Link *link); |
d5ebcf65 | 203 | |
a27588d4 | 204 | static int dhcp_pd_address_ready_callback(Address *address) { |
d5ebcf65 YW |
205 | Address *a; |
206 | ||
207 | assert(address); | |
208 | assert(address->link); | |
209 | ||
210 | SET_FOREACH(a, address->link->addresses) | |
a27588d4 | 211 | if (a->source == NETWORK_CONFIG_SOURCE_DHCP_PD) |
d5ebcf65 YW |
212 | a->callback = NULL; |
213 | ||
a27588d4 | 214 | return dhcp_pd_check_ready(address->link); |
d5ebcf65 YW |
215 | } |
216 | ||
a27588d4 | 217 | static int dhcp_pd_check_ready(Link *link) { |
d5ebcf65 YW |
218 | int r; |
219 | ||
220 | assert(link); | |
221 | assert(link->network); | |
222 | ||
a27588d4 YW |
223 | if (link->dhcp_pd_messages > 0) { |
224 | log_link_debug(link, "%s(): DHCP-PD addresses and routes are not set.", __func__); | |
d5ebcf65 YW |
225 | return 0; |
226 | } | |
227 | ||
a27588d4 | 228 | if (link->network->dhcp_pd_assign) { |
d5ebcf65 YW |
229 | bool has_ready = false; |
230 | Address *address; | |
231 | ||
232 | SET_FOREACH(address, link->addresses) { | |
a27588d4 | 233 | if (address->source != NETWORK_CONFIG_SOURCE_DHCP_PD) |
d5ebcf65 YW |
234 | continue; |
235 | if (address_is_ready(address)) { | |
236 | has_ready = true; | |
237 | break; | |
238 | } | |
239 | } | |
240 | ||
241 | if (!has_ready) { | |
242 | SET_FOREACH(address, link->addresses) | |
a27588d4 YW |
243 | if (address->source == NETWORK_CONFIG_SOURCE_DHCP_PD) |
244 | address->callback = dhcp_pd_address_ready_callback; | |
d5ebcf65 | 245 | |
a27588d4 | 246 | log_link_debug(link, "%s(): no DHCP-PD address is ready.", __func__); |
d5ebcf65 YW |
247 | return 0; |
248 | } | |
249 | } | |
250 | ||
a27588d4 | 251 | link->dhcp_pd_configured = true; |
d5ebcf65 | 252 | |
a27588d4 | 253 | log_link_debug(link, "DHCP-PD addresses and routes set."); |
d5ebcf65 | 254 | |
a27588d4 | 255 | r = dhcp_pd_remove(link, /* only_marked = */ true); |
d5ebcf65 YW |
256 | if (r < 0) |
257 | return r; | |
258 | ||
259 | link_check_ready(link); | |
260 | return 1; | |
261 | } | |
262 | ||
80d62d4f | 263 | static int dhcp_pd_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Route *route) { |
d5ebcf65 YW |
264 | int r; |
265 | ||
266 | assert(link); | |
d5ebcf65 | 267 | |
a27588d4 | 268 | r = route_configure_handler_internal(rtnl, m, link, "Failed to add prefix route for DHCP delegated subnet prefix"); |
d5ebcf65 YW |
269 | if (r <= 0) |
270 | return r; | |
271 | ||
a27588d4 | 272 | r = dhcp_pd_check_ready(link); |
d5ebcf65 YW |
273 | if (r < 0) |
274 | link_enter_failed(link); | |
275 | ||
276 | return 1; | |
277 | } | |
278 | ||
38488bab | 279 | static int dhcp_pd_request_route(Link *link, const struct in6_addr *prefix, usec_t lifetime_usec) { |
d5ebcf65 YW |
280 | _cleanup_(route_freep) Route *route = NULL; |
281 | Route *existing; | |
282 | int r; | |
283 | ||
284 | assert(link); | |
285 | assert(link->network); | |
286 | assert(prefix); | |
287 | ||
a27588d4 | 288 | if (link->network->dhcp_pd_assign) |
d5ebcf65 YW |
289 | return 0; |
290 | ||
291 | r = route_new(&route); | |
292 | if (r < 0) | |
293 | return r; | |
294 | ||
a27588d4 | 295 | route->source = NETWORK_CONFIG_SOURCE_DHCP_PD; |
d5ebcf65 YW |
296 | route->family = AF_INET6; |
297 | route->dst.in6 = *prefix; | |
38488bab | 298 | route->dst_prefixlen = 64; |
d5ebcf65 | 299 | route->protocol = RTPROT_DHCP; |
a27588d4 | 300 | route->priority = link->network->dhcp_pd_route_metric; |
d5ebcf65 YW |
301 | route->lifetime_usec = lifetime_usec; |
302 | ||
303 | if (route_get(NULL, link, route, &existing) < 0) | |
a27588d4 | 304 | link->dhcp_pd_configured = false; |
d5ebcf65 YW |
305 | else |
306 | route_unmark(existing); | |
307 | ||
a27588d4 YW |
308 | r = link_request_route(link, TAKE_PTR(route), true, &link->dhcp_pd_messages, |
309 | dhcp_pd_route_handler, NULL); | |
d5ebcf65 | 310 | if (r < 0) |
a27588d4 | 311 | return log_link_error_errno(link, r, "Failed to request DHCP-PD prefix route: %m"); |
d5ebcf65 YW |
312 | |
313 | return 0; | |
314 | } | |
315 | ||
80d62d4f | 316 | static int dhcp_pd_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Address *address) { |
d5ebcf65 YW |
317 | int r; |
318 | ||
319 | assert(link); | |
d5ebcf65 | 320 | |
a27588d4 | 321 | r = address_configure_handler_internal(rtnl, m, link, "Could not set DHCP-PD address"); |
d5ebcf65 YW |
322 | if (r <= 0) |
323 | return r; | |
324 | ||
a27588d4 | 325 | r = dhcp_pd_check_ready(link); |
d5ebcf65 YW |
326 | if (r < 0) |
327 | link_enter_failed(link); | |
328 | ||
329 | return 1; | |
330 | } | |
331 | ||
a27588d4 | 332 | static void log_dhcp_pd_address(Link *link, const Address *address) { |
d5ebcf65 YW |
333 | assert(address); |
334 | assert(address->family == AF_INET6); | |
335 | ||
b33dd04e | 336 | int log_level = address_get_harder(link, address, NULL) >= 0 ? LOG_DEBUG : LOG_INFO; |
d5ebcf65 YW |
337 | |
338 | if (log_level < log_get_max_level()) | |
339 | return; | |
340 | ||
a27588d4 | 341 | log_link_full(link, log_level, "DHCP-PD address %s (valid %s, preferred %s)", |
c71384a9 | 342 | IN6_ADDR_PREFIX_TO_STRING(&address->in_addr.in6, address->prefixlen), |
d5ebcf65 YW |
343 | FORMAT_LIFETIME(address->lifetime_valid_usec), |
344 | FORMAT_LIFETIME(address->lifetime_preferred_usec)); | |
345 | } | |
346 | ||
a27588d4 | 347 | static int dhcp_pd_request_address( |
d5ebcf65 YW |
348 | Link *link, |
349 | const struct in6_addr *prefix, | |
350 | usec_t lifetime_preferred_usec, | |
351 | usec_t lifetime_valid_usec) { | |
352 | ||
353 | _cleanup_set_free_ Set *addresses = NULL; | |
354 | struct in6_addr *a; | |
355 | int r; | |
356 | ||
357 | assert(link); | |
358 | assert(link->network); | |
359 | assert(prefix); | |
360 | ||
a27588d4 | 361 | if (!link->network->dhcp_pd_assign) |
d5ebcf65 YW |
362 | return 0; |
363 | ||
38488bab | 364 | r = dhcp_pd_generate_addresses(link, prefix, &addresses); |
d5ebcf65 | 365 | if (r < 0) |
a27588d4 | 366 | return log_link_warning_errno(link, r, "Failed to generate addresses for acquired DHCP delegated prefix: %m"); |
d5ebcf65 YW |
367 | |
368 | SET_FOREACH(a, addresses) { | |
369 | _cleanup_(address_freep) Address *address = NULL; | |
370 | Address *existing; | |
371 | ||
372 | r = address_new(&address); | |
373 | if (r < 0) | |
a27588d4 | 374 | return log_link_error_errno(link, r, "Failed to allocate address for DHCP delegated prefix: %m"); |
d5ebcf65 | 375 | |
a27588d4 | 376 | address->source = NETWORK_CONFIG_SOURCE_DHCP_PD; |
d5ebcf65 YW |
377 | address->family = AF_INET6; |
378 | address->in_addr.in6 = *a; | |
38488bab | 379 | address->prefixlen = 64; |
d5ebcf65 YW |
380 | address->lifetime_preferred_usec = lifetime_preferred_usec; |
381 | address->lifetime_valid_usec = lifetime_valid_usec; | |
38488bab | 382 | SET_FLAG(address->flags, IFA_F_MANAGETEMPADDR, link->network->dhcp_pd_manage_temporary_address); |
a27588d4 | 383 | address->route_metric = link->network->dhcp_pd_route_metric; |
d5ebcf65 | 384 | |
a27588d4 | 385 | log_dhcp_pd_address(link, address); |
d5ebcf65 | 386 | |
4b3590c3 TM |
387 | r = free_and_strdup_warn(&address->netlabel, link->network->dhcp_pd_netlabel); |
388 | if (r < 0) | |
389 | return r; | |
390 | ||
d5ebcf65 | 391 | if (address_get(link, address, &existing) < 0) |
a27588d4 | 392 | link->dhcp_pd_configured = false; |
d5ebcf65 YW |
393 | else |
394 | address_unmark(existing); | |
395 | ||
f60e6558 | 396 | r = link_request_address(link, address, &link->dhcp_pd_messages, |
a27588d4 | 397 | dhcp_pd_address_handler, NULL); |
d5ebcf65 | 398 | if (r < 0) |
a27588d4 | 399 | return log_link_error_errno(link, r, "Failed to request DHCP delegated prefix address: %m"); |
d5ebcf65 YW |
400 | } |
401 | ||
402 | return 0; | |
403 | } | |
404 | ||
a27588d4 | 405 | static int dhcp_pd_calculate_subnet_prefix( |
d5ebcf65 YW |
406 | const struct in6_addr *pd_prefix, |
407 | uint8_t pd_prefix_len, | |
408 | uint64_t subnet_id, | |
409 | struct in6_addr *ret) { | |
410 | ||
411 | struct in6_addr prefix; | |
412 | ||
413 | assert(pd_prefix); | |
414 | assert(pd_prefix_len <= 64); | |
415 | assert(ret); | |
416 | ||
417 | if (subnet_id >= UINT64_C(1) << (64 - pd_prefix_len)) | |
418 | return -ERANGE; | |
419 | ||
420 | prefix = *pd_prefix; | |
421 | ||
422 | if (pd_prefix_len < 32) | |
423 | prefix.s6_addr32[0] |= htobe32(subnet_id >> 32); | |
424 | ||
425 | prefix.s6_addr32[1] |= htobe32(subnet_id & 0xffffffff); | |
426 | ||
427 | *ret = prefix; | |
428 | return 0; | |
429 | } | |
430 | ||
a27588d4 | 431 | static int dhcp_pd_get_preferred_subnet_prefix( |
d5ebcf65 YW |
432 | Link *link, |
433 | const struct in6_addr *pd_prefix, | |
434 | uint8_t pd_prefix_len, | |
435 | struct in6_addr *ret) { | |
436 | ||
437 | struct in6_addr prefix; | |
438 | Link *assigned_link; | |
439 | int r; | |
440 | ||
441 | assert(link); | |
442 | assert(link->manager); | |
11d8a83f | 443 | assert(link->network); |
d5ebcf65 YW |
444 | assert(pd_prefix); |
445 | ||
a27588d4 | 446 | if (link->network->dhcp_pd_subnet_id >= 0) { |
d5ebcf65 YW |
447 | /* If the link has a preference for a particular subnet id try to allocate that */ |
448 | ||
a27588d4 | 449 | r = dhcp_pd_calculate_subnet_prefix(pd_prefix, pd_prefix_len, link->network->dhcp_pd_subnet_id, &prefix); |
d5ebcf65 YW |
450 | if (r < 0) |
451 | return log_link_warning_errno(link, r, | |
c0f86d66 | 452 | "subnet id %" PRIi64 " is out of range. Only have %" PRIu64 " subnets.", |
a27588d4 | 453 | link->network->dhcp_pd_subnet_id, UINT64_C(1) << (64 - pd_prefix_len)); |
d5ebcf65 | 454 | |
d5ebcf65 YW |
455 | *ret = prefix; |
456 | return 0; | |
457 | } | |
458 | ||
07b7337a YW |
459 | if (dhcp_pd_get_assigned_subnet_prefix(link, pd_prefix, pd_prefix_len, ret) >= 0) |
460 | return 0; | |
461 | ||
d5ebcf65 YW |
462 | for (uint64_t n = 0; ; n++) { |
463 | /* If we do not have an allocation preference just iterate | |
464 | * through the address space and return the first free prefix. */ | |
465 | ||
a27588d4 | 466 | r = dhcp_pd_calculate_subnet_prefix(pd_prefix, pd_prefix_len, n, &prefix); |
d5ebcf65 YW |
467 | if (r < 0) |
468 | return log_link_warning_errno(link, r, | |
469 | "Couldn't find a suitable prefix. Ran out of address space."); | |
470 | ||
471 | /* Do not use explicitly requested subnet IDs. Note that the corresponding link may not | |
472 | * appear yet. So, we need to check the ID is not used in any .network files. */ | |
a27588d4 | 473 | if (set_contains(link->manager->dhcp_pd_subnet_ids, &n)) |
d5ebcf65 YW |
474 | continue; |
475 | ||
476 | /* Check that the prefix is not assigned to another link. */ | |
a27588d4 | 477 | if (link_get_by_dhcp_pd_subnet_prefix(link->manager, &prefix, &assigned_link) < 0 || |
07b7337a YW |
478 | assigned_link == link) |
479 | break; | |
d5ebcf65 | 480 | } |
07b7337a YW |
481 | |
482 | r = link_add_dhcp_pd_subnet_prefix(link, &prefix); | |
483 | if (r < 0) | |
484 | return log_link_warning_errno(link, r, "Failed to save acquired free subnet prefix: %m"); | |
485 | ||
486 | *ret = prefix; | |
487 | return 0; | |
d5ebcf65 YW |
488 | } |
489 | ||
a27588d4 | 490 | static int dhcp_pd_assign_subnet_prefix( |
d5ebcf65 YW |
491 | Link *link, |
492 | const struct in6_addr *pd_prefix, | |
493 | uint8_t pd_prefix_len, | |
494 | usec_t lifetime_preferred_usec, | |
38488bab YW |
495 | usec_t lifetime_valid_usec, |
496 | bool is_uplink) { | |
d5ebcf65 | 497 | |
d5ebcf65 YW |
498 | struct in6_addr prefix; |
499 | int r; | |
500 | ||
501 | assert(link); | |
502 | assert(link->network); | |
503 | assert(pd_prefix); | |
504 | ||
07b7337a YW |
505 | r = dhcp_pd_get_preferred_subnet_prefix(link, pd_prefix, pd_prefix_len, &prefix); |
506 | if (r < 0) | |
507 | return r == -ERANGE ? 0 : r; | |
d5ebcf65 | 508 | |
c71384a9 | 509 | const char *pretty = IN6_ADDR_PREFIX_TO_STRING(&prefix, 64); |
d5ebcf65 | 510 | |
a27588d4 | 511 | if (link_radv_enabled(link) && link->network->dhcp_pd_announce) { |
38488bab YW |
512 | if (is_uplink) |
513 | log_link_debug(link, "Ignoring Announce= setting on upstream interface."); | |
514 | else { | |
515 | r = radv_add_prefix(link, &prefix, 64, lifetime_preferred_usec, lifetime_valid_usec); | |
516 | if (r < 0) | |
517 | return log_link_warning_errno(link, r, | |
518 | "Failed to assign/update prefix %s to IPv6 Router Advertisement: %m", | |
c71384a9 | 519 | pretty); |
38488bab | 520 | } |
d5ebcf65 YW |
521 | } |
522 | ||
38488bab | 523 | r = dhcp_pd_request_route(link, &prefix, lifetime_valid_usec); |
d5ebcf65 YW |
524 | if (r < 0) |
525 | return log_link_warning_errno(link, r, | |
c71384a9 | 526 | "Failed to assign/update route for prefix %s: %m", pretty); |
d5ebcf65 | 527 | |
38488bab | 528 | r = dhcp_pd_request_address(link, &prefix, lifetime_preferred_usec, lifetime_valid_usec); |
d5ebcf65 YW |
529 | if (r < 0) |
530 | return log_link_warning_errno(link, r, | |
c71384a9 | 531 | "Failed to assign/update address for prefix %s: %m", pretty); |
d5ebcf65 | 532 | |
c71384a9 | 533 | log_link_debug(link, "Assigned prefix %s", pretty); |
d5ebcf65 YW |
534 | return 1; |
535 | } | |
536 | ||
a27588d4 | 537 | static int dhcp_pd_prepare(Link *link) { |
d5ebcf65 YW |
538 | if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) |
539 | return 0; | |
540 | ||
a27588d4 | 541 | if (!link_dhcp_pd_is_enabled(link)) |
d5ebcf65 YW |
542 | return 0; |
543 | ||
a27588d4 | 544 | if (link_radv_enabled(link) && link->network->dhcp_pd_announce && !link->radv) |
d5ebcf65 YW |
545 | return 0; |
546 | ||
2ccada8d TH |
547 | link_mark_addresses(link, NETWORK_CONFIG_SOURCE_DHCP_PD); |
548 | link_mark_routes(link, NETWORK_CONFIG_SOURCE_DHCP_PD); | |
d5ebcf65 | 549 | |
c3cd5351 | 550 | return 1; |
d5ebcf65 YW |
551 | } |
552 | ||
a27588d4 | 553 | static int dhcp_pd_finalize(Link *link) { |
d5ebcf65 YW |
554 | int r; |
555 | ||
556 | if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) | |
557 | return 0; | |
558 | ||
a27588d4 YW |
559 | if (link->dhcp_pd_messages == 0) { |
560 | link->dhcp_pd_configured = false; | |
d5ebcf65 | 561 | |
a27588d4 | 562 | r = dhcp_pd_remove(link, /* only_marked = */ true); |
d5ebcf65 YW |
563 | if (r < 0) |
564 | return r; | |
565 | } | |
566 | ||
a27588d4 | 567 | if (!link->dhcp_pd_configured) |
d5ebcf65 YW |
568 | link_set_state(link, LINK_STATE_CONFIGURING); |
569 | ||
570 | link_check_ready(link); | |
571 | return 0; | |
572 | } | |
573 | ||
a27588d4 | 574 | void dhcp_pd_prefix_lost(Link *uplink) { |
da10d2d5 | 575 | Route *route; |
d5ebcf65 YW |
576 | Link *link; |
577 | int r; | |
578 | ||
a27588d4 YW |
579 | assert(uplink); |
580 | assert(uplink->manager); | |
d5ebcf65 | 581 | |
a27588d4 YW |
582 | HASHMAP_FOREACH(link, uplink->manager->links_by_index) { |
583 | if (!dhcp_pd_is_uplink(link, uplink, /* accept_auto = */ true)) | |
d5ebcf65 YW |
584 | continue; |
585 | ||
a27588d4 | 586 | r = dhcp_pd_remove(link, /* only_marked = */ false); |
d5ebcf65 YW |
587 | if (r < 0) |
588 | link_enter_failed(link); | |
589 | } | |
590 | ||
a27588d4 | 591 | SET_FOREACH(route, uplink->manager->routes) { |
277521a1 | 592 | if (!IN_SET(route->source, NETWORK_CONFIG_SOURCE_DHCP4, NETWORK_CONFIG_SOURCE_DHCP6)) |
da10d2d5 YW |
593 | continue; |
594 | if (route->family != AF_INET6) | |
595 | continue; | |
596 | if (route->type != RTN_UNREACHABLE) | |
597 | continue; | |
a27588d4 | 598 | if (!set_contains(uplink->dhcp_pd_prefixes, |
da10d2d5 YW |
599 | &(struct in_addr_prefix) { |
600 | .family = AF_INET6, | |
601 | .prefixlen = route->dst_prefixlen, | |
602 | .address = route->dst })) | |
603 | continue; | |
604 | ||
605 | (void) route_remove(route); | |
606 | ||
a27588d4 | 607 | route_cancel_request(route, uplink); |
da10d2d5 YW |
608 | } |
609 | ||
a27588d4 | 610 | set_clear(uplink->dhcp_pd_prefixes); |
d5ebcf65 YW |
611 | } |
612 | ||
e49bad01 YW |
613 | void dhcp4_pd_prefix_lost(Link *uplink) { |
614 | Link *tunnel; | |
615 | ||
616 | dhcp_pd_prefix_lost(uplink); | |
617 | ||
618 | if (uplink->dhcp4_6rd_tunnel_name && | |
619 | link_get_by_name(uplink->manager, uplink->dhcp4_6rd_tunnel_name, &tunnel) >= 0) | |
620 | (void) link_remove(tunnel); | |
621 | } | |
622 | ||
80d62d4f | 623 | static int dhcp4_unreachable_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Route *route) { |
e49bad01 YW |
624 | int r; |
625 | ||
626 | assert(link); | |
e49bad01 | 627 | |
21feba0a | 628 | r = route_configure_handler_internal(rtnl, m, link, "Failed to set unreachable route for DHCPv4 delegated prefix"); |
e49bad01 YW |
629 | if (r <= 0) |
630 | return r; | |
631 | ||
632 | r = dhcp4_check_ready(link); | |
633 | if (r < 0) | |
634 | link_enter_failed(link); | |
635 | ||
636 | return 1; | |
637 | } | |
638 | ||
80d62d4f | 639 | static int dhcp6_unreachable_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Route *route) { |
d5ebcf65 YW |
640 | int r; |
641 | ||
642 | assert(link); | |
d5ebcf65 | 643 | |
21feba0a | 644 | r = route_configure_handler_internal(rtnl, m, link, "Failed to set unreachable route for DHCPv6 delegated prefix"); |
d5ebcf65 YW |
645 | if (r <= 0) |
646 | return r; | |
647 | ||
648 | r = dhcp6_check_ready(link); | |
649 | if (r < 0) | |
650 | link_enter_failed(link); | |
651 | ||
652 | return 1; | |
653 | } | |
654 | ||
a27588d4 | 655 | static int dhcp_request_unreachable_route( |
5ed10a19 YW |
656 | Link *link, |
657 | const struct in6_addr *addr, | |
658 | uint8_t prefixlen, | |
659 | usec_t lifetime_usec, | |
a27588d4 YW |
660 | NetworkConfigSource source, |
661 | const union in_addr_union *server_address, | |
662 | unsigned *counter, | |
706cd859 YW |
663 | route_netlink_handler_t callback, |
664 | bool *configured) { | |
5ed10a19 | 665 | |
d5ebcf65 | 666 | _cleanup_(route_freep) Route *route = NULL; |
d5ebcf65 YW |
667 | Route *existing; |
668 | int r; | |
669 | ||
670 | assert(link); | |
671 | assert(addr); | |
a27588d4 | 672 | assert(IN_SET(source, NETWORK_CONFIG_SOURCE_DHCP4, NETWORK_CONFIG_SOURCE_DHCP6)); |
5ed10a19 | 673 | assert(server_address); |
a27588d4 YW |
674 | assert(counter); |
675 | assert(callback); | |
706cd859 | 676 | assert(configured); |
d5ebcf65 | 677 | |
a536ec38 | 678 | if (prefixlen >= 64) { |
a27588d4 | 679 | log_link_debug(link, "Not adding a blocking route for DHCP delegated prefix %s since the prefix has length >= 64.", |
c71384a9 | 680 | IN6_ADDR_PREFIX_TO_STRING(addr, prefixlen)); |
d5ebcf65 YW |
681 | return 0; |
682 | } | |
683 | ||
684 | r = route_new(&route); | |
685 | if (r < 0) | |
686 | return log_oom(); | |
687 | ||
a27588d4 | 688 | route->source = source; |
5ed10a19 | 689 | route->provider = *server_address; |
d5ebcf65 YW |
690 | route->family = AF_INET6; |
691 | route->dst.in6 = *addr; | |
692 | route->dst_prefixlen = prefixlen; | |
d5ebcf65 YW |
693 | route->type = RTN_UNREACHABLE; |
694 | route->protocol = RTPROT_DHCP; | |
557e1b52 | 695 | route->priority = IP6_RT_PRIO_USER; |
d5ebcf65 YW |
696 | route->lifetime_usec = lifetime_usec; |
697 | ||
698 | if (route_get(link->manager, NULL, route, &existing) < 0) | |
706cd859 | 699 | *configured = false; |
d5ebcf65 YW |
700 | else |
701 | route_unmark(existing); | |
702 | ||
a27588d4 | 703 | r = link_request_route(link, TAKE_PTR(route), true, counter, callback, NULL); |
c71384a9 | 704 | if (r < 0) |
a27588d4 | 705 | return log_link_error_errno(link, r, "Failed to request unreachable route for DHCP delegated prefix %s: %m", |
c71384a9 | 706 | IN6_ADDR_PREFIX_TO_STRING(addr, prefixlen)); |
d5ebcf65 YW |
707 | |
708 | return 0; | |
709 | } | |
710 | ||
e49bad01 YW |
711 | static int dhcp4_request_unreachable_route( |
712 | Link *link, | |
713 | const struct in6_addr *addr, | |
714 | uint8_t prefixlen, | |
715 | usec_t lifetime_usec, | |
716 | const union in_addr_union *server_address) { | |
717 | ||
718 | return dhcp_request_unreachable_route(link, addr, prefixlen, lifetime_usec, | |
719 | NETWORK_CONFIG_SOURCE_DHCP4, server_address, | |
706cd859 YW |
720 | &link->dhcp4_messages, dhcp4_unreachable_route_handler, |
721 | &link->dhcp4_configured); | |
e49bad01 YW |
722 | } |
723 | ||
a27588d4 YW |
724 | static int dhcp6_request_unreachable_route( |
725 | Link *link, | |
726 | const struct in6_addr *addr, | |
727 | uint8_t prefixlen, | |
728 | usec_t lifetime_usec, | |
729 | const union in_addr_union *server_address) { | |
730 | ||
731 | return dhcp_request_unreachable_route(link, addr, prefixlen, lifetime_usec, | |
732 | NETWORK_CONFIG_SOURCE_DHCP6, server_address, | |
706cd859 YW |
733 | &link->dhcp6_messages, dhcp6_unreachable_route_handler, |
734 | &link->dhcp6_configured); | |
a27588d4 YW |
735 | } |
736 | ||
737 | static int dhcp_pd_prefix_add(Link *link, const struct in6_addr *prefix, uint8_t prefixlen) { | |
d5ebcf65 YW |
738 | struct in_addr_prefix *p; |
739 | int r; | |
740 | ||
741 | assert(link); | |
742 | assert(prefix); | |
743 | ||
744 | p = new(struct in_addr_prefix, 1); | |
745 | if (!p) | |
746 | return log_oom(); | |
747 | ||
748 | *p = (struct in_addr_prefix) { | |
749 | .family = AF_INET6, | |
750 | .prefixlen = prefixlen, | |
751 | .address.in6 = *prefix, | |
752 | }; | |
753 | ||
c71384a9 ZJS |
754 | int log_level = set_contains(link->dhcp_pd_prefixes, p) ? LOG_DEBUG : |
755 | prefixlen > 64 || prefixlen < 48 ? LOG_WARNING : LOG_INFO; | |
d5ebcf65 | 756 | log_link_full(link, |
c71384a9 | 757 | log_level, |
21feba0a | 758 | "DHCP: received delegated prefix %s%s", |
c71384a9 | 759 | IN6_ADDR_PREFIX_TO_STRING(prefix, prefixlen), |
d5ebcf65 YW |
760 | prefixlen > 64 ? " with prefix length > 64, ignoring." : |
761 | prefixlen < 48 ? " with prefix length < 48, looks unusual.": ""); | |
762 | ||
763 | /* Store PD prefix even if prefixlen > 64, not to make logged at warning level so frequently. */ | |
a27588d4 | 764 | r = set_ensure_consume(&link->dhcp_pd_prefixes, &in_addr_prefix_hash_ops_free, p); |
d5ebcf65 | 765 | if (r < 0) |
c71384a9 ZJS |
766 | return log_link_error_errno(link, r, "Failed to store DHCP delegated prefix %s: %m", |
767 | IN6_ADDR_PREFIX_TO_STRING(prefix, prefixlen)); | |
a536ec38 | 768 | return 0; |
d5ebcf65 YW |
769 | } |
770 | ||
e49bad01 YW |
771 | static int dhcp4_pd_request_default_gateway_on_6rd_tunnel(Link *link, const struct in_addr *br_address, usec_t lifetime_usec) { |
772 | _cleanup_(route_freep) Route *route = NULL; | |
773 | Route *existing; | |
774 | int r; | |
775 | ||
776 | assert(link); | |
777 | assert(br_address); | |
778 | ||
779 | r = route_new(&route); | |
780 | if (r < 0) | |
781 | return log_link_debug_errno(link, r, "Failed to allocate default gateway for DHCP delegated prefix: %m"); | |
782 | ||
783 | route->source = NETWORK_CONFIG_SOURCE_DHCP_PD; | |
784 | route->family = AF_INET6; | |
785 | route->gw_family = AF_INET6; | |
786 | route->gw.in6.s6_addr32[3] = br_address->s_addr; | |
787 | route->scope = RT_SCOPE_UNIVERSE; | |
788 | route->protocol = RTPROT_DHCP; | |
789 | route->priority = IP6_RT_PRIO_USER; | |
790 | route->lifetime_usec = lifetime_usec; | |
791 | ||
792 | if (route_get(NULL, link, route, &existing) < 0) /* This is a new route. */ | |
793 | link->dhcp_pd_configured = false; | |
794 | else | |
795 | route_unmark(existing); | |
796 | ||
797 | r = link_request_route(link, TAKE_PTR(route), true, &link->dhcp_pd_messages, | |
798 | dhcp_pd_route_handler, NULL); | |
799 | if (r < 0) | |
800 | return log_link_debug_errno(link, r, "Failed to request default gateway for DHCP delegated prefix: %m"); | |
801 | ||
802 | return 0; | |
803 | } | |
804 | ||
805 | static void dhcp4_calculate_pd_prefix( | |
806 | const struct in_addr *ipv4address, | |
807 | uint8_t ipv4masklen, | |
808 | const struct in6_addr *sixrd_prefix, | |
809 | uint8_t sixrd_prefixlen, | |
810 | struct in6_addr *ret_pd_prefix, | |
811 | uint8_t *ret_pd_prefixlen) { | |
812 | ||
813 | struct in6_addr pd_prefix; | |
814 | ||
815 | assert(ipv4address); | |
816 | assert(ipv4masklen <= 32); | |
817 | assert(sixrd_prefix); | |
818 | assert(32 - ipv4masklen + sixrd_prefixlen <= 128); | |
819 | assert(ret_pd_prefix); | |
820 | ||
821 | pd_prefix = *sixrd_prefix; | |
822 | for (unsigned i = 0; i < (unsigned) (32 - ipv4masklen); i++) | |
823 | if (ipv4address->s_addr & htobe32(UINT32_C(1) << (32 - ipv4masklen - i - 1))) | |
824 | pd_prefix.s6_addr[(i + sixrd_prefixlen) / 8] |= 1 << (7 - (i + sixrd_prefixlen) % 8); | |
825 | ||
826 | *ret_pd_prefix = pd_prefix; | |
827 | if (ret_pd_prefixlen) | |
828 | *ret_pd_prefixlen = 32 - ipv4masklen + sixrd_prefixlen; | |
829 | } | |
830 | ||
831 | static int dhcp4_pd_assign_subnet_prefix(Link *link, Link *uplink) { | |
832 | uint8_t ipv4masklen, sixrd_prefixlen, pd_prefixlen; | |
833 | struct in6_addr sixrd_prefix, pd_prefix; | |
834 | const struct in_addr *br_addresses; | |
835 | struct in_addr ipv4address; | |
a93538e8 | 836 | usec_t lifetime_usec; |
e49bad01 YW |
837 | int r; |
838 | ||
839 | assert(link); | |
840 | assert(uplink); | |
def4741b | 841 | assert(uplink->manager); |
e49bad01 YW |
842 | assert(uplink->dhcp_lease); |
843 | ||
844 | r = sd_dhcp_lease_get_address(uplink->dhcp_lease, &ipv4address); | |
845 | if (r < 0) | |
846 | return log_link_warning_errno(uplink, r, "Failed to get DHCPv4 address: %m"); | |
847 | ||
a93538e8 | 848 | r = sd_dhcp_lease_get_lifetime_timestamp(uplink->dhcp_lease, CLOCK_BOOTTIME, &lifetime_usec); |
e49bad01 YW |
849 | if (r < 0) |
850 | return log_link_warning_errno(uplink, r, "Failed to get lifetime of DHCPv4 lease: %m"); | |
851 | ||
e49bad01 YW |
852 | r = sd_dhcp_lease_get_6rd(uplink->dhcp_lease, &ipv4masklen, &sixrd_prefixlen, &sixrd_prefix, &br_addresses, NULL); |
853 | if (r < 0) | |
21feba0a | 854 | return log_link_warning_errno(uplink, r, "Failed to get DHCPv4 6rd option: %m"); |
e49bad01 YW |
855 | |
856 | dhcp4_calculate_pd_prefix(&ipv4address, ipv4masklen, &sixrd_prefix, sixrd_prefixlen, &pd_prefix, &pd_prefixlen); | |
857 | ||
858 | if (pd_prefixlen > 64) | |
859 | return 0; | |
860 | ||
861 | r = dhcp_pd_prepare(link); | |
862 | if (r <= 0) | |
863 | return r; | |
864 | ||
865 | if (streq_ptr(uplink->dhcp4_6rd_tunnel_name, link->ifname)) { | |
e49bad01 YW |
866 | r = dhcp4_pd_request_default_gateway_on_6rd_tunnel(link, &br_addresses[0], lifetime_usec); |
867 | if (r < 0) | |
868 | return r; | |
e49bad01 YW |
869 | } |
870 | ||
38488bab YW |
871 | r = dhcp_pd_assign_subnet_prefix(link, &pd_prefix, pd_prefixlen, lifetime_usec, lifetime_usec, /* is_uplink = */ false); |
872 | if (r < 0) | |
873 | return r; | |
874 | ||
e49bad01 YW |
875 | return dhcp_pd_finalize(link); |
876 | } | |
877 | ||
878 | static int dhcp4_pd_6rd_tunnel_create_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { | |
879 | int r; | |
880 | ||
881 | assert(m); | |
882 | assert(link); | |
883 | assert(link->manager); | |
884 | assert(link->dhcp4_6rd_tunnel_name); | |
885 | ||
886 | if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) | |
887 | return 0; | |
888 | ||
889 | r = sd_netlink_message_get_errno(m); | |
890 | if (r < 0) { | |
21feba0a | 891 | log_link_message_warning_errno(link, m, r, "Failed to create tunnel device for DHCPv4 6rd"); |
e49bad01 YW |
892 | link_enter_failed(link); |
893 | return 0; | |
894 | } | |
895 | ||
896 | return 0; | |
897 | } | |
898 | ||
899 | int dhcp4_pd_prefix_acquired(Link *uplink) { | |
900 | _cleanup_free_ char *tunnel_name = NULL; | |
901 | uint8_t ipv4masklen, sixrd_prefixlen, pd_prefixlen; | |
902 | struct in6_addr sixrd_prefix, pd_prefix; | |
903 | struct in_addr ipv4address; | |
904 | union in_addr_union server_address; | |
21feba0a | 905 | const struct in_addr *br_addresses; |
a93538e8 | 906 | usec_t lifetime_usec; |
e49bad01 YW |
907 | Link *link; |
908 | int r; | |
909 | ||
910 | assert(uplink); | |
def4741b | 911 | assert(uplink->manager); |
e49bad01 YW |
912 | assert(uplink->dhcp_lease); |
913 | ||
914 | r = sd_dhcp_lease_get_address(uplink->dhcp_lease, &ipv4address); | |
915 | if (r < 0) | |
916 | return log_link_warning_errno(uplink, r, "Failed to get DHCPv4 address: %m"); | |
917 | ||
a93538e8 | 918 | r = sd_dhcp_lease_get_lifetime_timestamp(uplink->dhcp_lease, CLOCK_BOOTTIME, &lifetime_usec); |
e49bad01 YW |
919 | if (r < 0) |
920 | return log_link_warning_errno(uplink, r, "Failed to get lifetime of DHCPv4 lease: %m"); | |
921 | ||
e49bad01 YW |
922 | r = sd_dhcp_lease_get_server_identifier(uplink->dhcp_lease, &server_address.in); |
923 | if (r < 0) | |
924 | return log_link_warning_errno(uplink, r, "Failed to get server address of DHCPv4 lease: %m"); | |
925 | ||
21feba0a | 926 | r = sd_dhcp_lease_get_6rd(uplink->dhcp_lease, &ipv4masklen, &sixrd_prefixlen, &sixrd_prefix, &br_addresses, NULL); |
e49bad01 | 927 | if (r < 0) |
21feba0a YW |
928 | return log_link_warning_errno(uplink, r, "Failed to get DHCPv4 6rd option: %m"); |
929 | ||
c71384a9 | 930 | if (DEBUG_LOGGING) |
21feba0a | 931 | log_link_debug(uplink, "DHCPv4: 6rd option is acquired: IPv4_masklen=%u, 6rd_prefix=%s, br_address="IPV4_ADDRESS_FMT_STR, |
c71384a9 ZJS |
932 | ipv4masklen, |
933 | IN6_ADDR_PREFIX_TO_STRING(&sixrd_prefix, sixrd_prefixlen), | |
934 | IPV4_ADDRESS_FMT_VAL(*br_addresses)); | |
e49bad01 YW |
935 | |
936 | /* Calculate PD prefix */ | |
937 | dhcp4_calculate_pd_prefix(&ipv4address, ipv4masklen, &sixrd_prefix, sixrd_prefixlen, &pd_prefix, &pd_prefixlen); | |
938 | ||
939 | /* Register and log PD prefix */ | |
940 | r = dhcp_pd_prefix_add(uplink, &pd_prefix, pd_prefixlen); | |
941 | if (r < 0) | |
942 | return r; | |
943 | ||
944 | /* Request unreachable route */ | |
945 | r = dhcp4_request_unreachable_route(uplink, &pd_prefix, pd_prefixlen, lifetime_usec, &server_address); | |
946 | if (r < 0) | |
947 | return r; | |
948 | ||
949 | /* Generate 6rd SIT tunnel device name. */ | |
950 | r = dhcp4_pd_create_6rd_tunnel_name(uplink, &tunnel_name); | |
951 | if (r < 0) | |
952 | return r; | |
953 | ||
954 | /* Remove old tunnel device if exists. */ | |
955 | if (!streq_ptr(uplink->dhcp4_6rd_tunnel_name, tunnel_name)) { | |
956 | Link *old_tunnel; | |
957 | ||
958 | if (uplink->dhcp4_6rd_tunnel_name && | |
959 | link_get_by_name(uplink->manager, uplink->dhcp4_6rd_tunnel_name, &old_tunnel) >= 0) | |
960 | (void) link_remove(old_tunnel); | |
961 | ||
962 | free_and_replace(uplink->dhcp4_6rd_tunnel_name, tunnel_name); | |
963 | } | |
964 | ||
965 | /* Create 6rd SIT tunnel device if it does not exist yet. */ | |
966 | if (link_get_by_name(uplink->manager, uplink->dhcp4_6rd_tunnel_name, NULL) < 0) { | |
967 | r = dhcp4_pd_create_6rd_tunnel(uplink, dhcp4_pd_6rd_tunnel_create_handler); | |
968 | if (r < 0) | |
969 | return r; | |
970 | } | |
971 | ||
972 | /* Then, assign subnet prefixes to downstream interfaces. */ | |
973 | HASHMAP_FOREACH(link, uplink->manager->links_by_index) { | |
974 | if (!dhcp_pd_is_uplink(link, uplink, /* accept_auto = */ true)) | |
975 | continue; | |
976 | ||
977 | r = dhcp4_pd_assign_subnet_prefix(link, uplink); | |
978 | if (r < 0) { | |
979 | /* When failed on the upstream interface (i.e., the case link == uplink), | |
980 | * immediately abort the assignment of the prefixes. As, the all assigned | |
981 | * prefixes will be dropped soon in link_enter_failed(), and it is meaningless | |
982 | * to continue the assignment. */ | |
983 | if (link == uplink) | |
984 | return r; | |
985 | ||
986 | link_enter_failed(link); | |
987 | } | |
988 | } | |
989 | ||
990 | return 0; | |
991 | } | |
992 | ||
a27588d4 | 993 | static int dhcp6_pd_assign_subnet_prefixes(Link *link, Link *uplink) { |
d5ebcf65 YW |
994 | int r; |
995 | ||
5014e660 YW |
996 | assert(link); |
997 | assert(uplink); | |
998 | assert(uplink->dhcp6_lease); | |
d5ebcf65 | 999 | |
a27588d4 | 1000 | r = dhcp_pd_prepare(link); |
c3cd5351 | 1001 | if (r <= 0) |
5014e660 | 1002 | return r; |
d5ebcf65 | 1003 | |
d8ec95c7 YW |
1004 | FOREACH_DHCP6_PD_PREFIX(uplink->dhcp6_lease) { |
1005 | usec_t lifetime_preferred_usec, lifetime_valid_usec; | |
d5ebcf65 YW |
1006 | struct in6_addr pd_prefix; |
1007 | uint8_t pd_prefix_len; | |
1008 | ||
d8ec95c7 | 1009 | r = sd_dhcp6_lease_get_pd_prefix(uplink->dhcp6_lease, &pd_prefix, &pd_prefix_len); |
d5ebcf65 | 1010 | if (r < 0) |
d8ec95c7 | 1011 | return r; |
d5ebcf65 | 1012 | |
5014e660 | 1013 | if (pd_prefix_len > 64) |
d5ebcf65 YW |
1014 | continue; |
1015 | ||
d5ebcf65 YW |
1016 | /* Mask prefix for safety. */ |
1017 | r = in6_addr_mask(&pd_prefix, pd_prefix_len); | |
1018 | if (r < 0) | |
5014e660 | 1019 | return r; |
d5ebcf65 | 1020 | |
d8ec95c7 YW |
1021 | r = sd_dhcp6_lease_get_pd_lifetime_timestamp(uplink->dhcp6_lease, CLOCK_BOOTTIME, |
1022 | &lifetime_preferred_usec, &lifetime_valid_usec); | |
1023 | if (r < 0) | |
1024 | return r; | |
1025 | ||
38488bab | 1026 | r = dhcp_pd_assign_subnet_prefix(link, &pd_prefix, pd_prefix_len, |
d8ec95c7 | 1027 | lifetime_preferred_usec, lifetime_valid_usec, |
38488bab | 1028 | /* is_uplink = */ link == uplink); |
d5ebcf65 YW |
1029 | if (r < 0) |
1030 | return r; | |
1031 | } | |
1032 | ||
a27588d4 | 1033 | return dhcp_pd_finalize(link); |
d5ebcf65 YW |
1034 | } |
1035 | ||
a27588d4 | 1036 | int dhcp6_pd_prefix_acquired(Link *uplink) { |
5ed10a19 | 1037 | union in_addr_union server_address; |
d5ebcf65 | 1038 | Link *link; |
d5ebcf65 YW |
1039 | int r; |
1040 | ||
a27588d4 YW |
1041 | assert(uplink); |
1042 | assert(uplink->dhcp6_lease); | |
d5ebcf65 | 1043 | |
a27588d4 | 1044 | r = sd_dhcp6_lease_get_server_address(uplink->dhcp6_lease, &server_address.in6); |
5ed10a19 | 1045 | if (r < 0) |
a27588d4 | 1046 | return log_link_warning_errno(uplink, r, "Failed to get server address of DHCPv6 lease: %m"); |
5ed10a19 | 1047 | |
41664456 | 1048 | /* First, logs acquired prefixes and request unreachable routes. */ |
d8ec95c7 YW |
1049 | FOREACH_DHCP6_PD_PREFIX(uplink->dhcp6_lease) { |
1050 | usec_t lifetime_valid_usec; | |
d5ebcf65 YW |
1051 | struct in6_addr pd_prefix; |
1052 | uint8_t pd_prefix_len; | |
1053 | ||
d8ec95c7 | 1054 | r = sd_dhcp6_lease_get_pd_prefix(uplink->dhcp6_lease, &pd_prefix, &pd_prefix_len); |
d5ebcf65 | 1055 | if (r < 0) |
d8ec95c7 | 1056 | return r; |
d5ebcf65 | 1057 | |
d5ebcf65 YW |
1058 | /* Mask prefix for safety. */ |
1059 | r = in6_addr_mask(&pd_prefix, pd_prefix_len); | |
41664456 | 1060 | if (r < 0) |
21feba0a | 1061 | return log_link_error_errno(uplink, r, "Failed to mask DHCPv6 delegated prefix: %m"); |
41664456 | 1062 | |
a27588d4 | 1063 | r = dhcp_pd_prefix_add(uplink, &pd_prefix, pd_prefix_len); |
d5ebcf65 YW |
1064 | if (r < 0) |
1065 | return r; | |
1066 | ||
d8ec95c7 YW |
1067 | r = sd_dhcp6_lease_get_pd_lifetime_timestamp(uplink->dhcp6_lease, CLOCK_BOOTTIME, |
1068 | NULL, &lifetime_valid_usec); | |
1069 | if (r < 0) | |
1070 | return r; | |
1071 | ||
5235d739 | 1072 | r = dhcp6_request_unreachable_route(uplink, &pd_prefix, pd_prefix_len, |
d8ec95c7 | 1073 | lifetime_valid_usec, &server_address); |
d5ebcf65 YW |
1074 | if (r < 0) |
1075 | return r; | |
1076 | } | |
1077 | ||
41664456 | 1078 | /* Then, assign subnet prefixes. */ |
a27588d4 YW |
1079 | HASHMAP_FOREACH(link, uplink->manager->links_by_index) { |
1080 | if (!dhcp_pd_is_uplink(link, uplink, /* accept_auto = */ true)) | |
41664456 YW |
1081 | continue; |
1082 | ||
a27588d4 | 1083 | r = dhcp6_pd_assign_subnet_prefixes(link, uplink); |
d5ebcf65 | 1084 | if (r < 0) { |
a27588d4 | 1085 | /* When failed on the upstream interface (i.e., the case link == uplink), |
41664456 YW |
1086 | * immediately abort the assignment of the prefixes. As, the all assigned |
1087 | * prefixes will be dropped soon in link_enter_failed(), and it is meaningless | |
1088 | * to continue the assignment. */ | |
a27588d4 | 1089 | if (link == uplink) |
d5ebcf65 YW |
1090 | return r; |
1091 | ||
1092 | link_enter_failed(link); | |
1093 | } | |
1094 | } | |
d5ebcf65 YW |
1095 | |
1096 | return 0; | |
1097 | } | |
1098 | ||
e49bad01 YW |
1099 | static bool dhcp4_pd_uplink_is_ready(Link *link) { |
1100 | assert(link); | |
1101 | ||
1102 | if (!link->network) | |
1103 | return false; | |
1104 | ||
1105 | if (!link->network->dhcp_use_6rd) | |
1106 | return false; | |
1107 | ||
1108 | if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) | |
1109 | return false; | |
1110 | ||
1111 | if (!link->dhcp_client) | |
1112 | return false; | |
1113 | ||
1114 | if (sd_dhcp_client_is_running(link->dhcp_client) <= 0) | |
1115 | return false; | |
1116 | ||
0ad8d953 | 1117 | return sd_dhcp_lease_has_6rd(link->dhcp_lease); |
e49bad01 YW |
1118 | } |
1119 | ||
d5ebcf65 YW |
1120 | static bool dhcp6_pd_uplink_is_ready(Link *link) { |
1121 | assert(link); | |
1122 | ||
1123 | if (!link->network) | |
1124 | return false; | |
1125 | ||
1126 | if (!link->network->dhcp6_use_pd_prefix) | |
1127 | return false; | |
1128 | ||
1129 | if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) | |
1130 | return false; | |
1131 | ||
1132 | if (!link->dhcp6_client) | |
1133 | return false; | |
1134 | ||
1135 | if (sd_dhcp6_client_is_running(link->dhcp6_client) <= 0) | |
1136 | return false; | |
1137 | ||
fb70992d | 1138 | return sd_dhcp6_lease_has_pd_prefix(link->dhcp6_lease); |
d5ebcf65 YW |
1139 | } |
1140 | ||
a27588d4 | 1141 | int dhcp_pd_find_uplink(Link *link, Link **ret) { |
d5ebcf65 YW |
1142 | Link *uplink = NULL; |
1143 | int r = 0; | |
1144 | ||
1145 | assert(link); | |
1146 | assert(link->manager); | |
a27588d4 | 1147 | assert(link_dhcp_pd_is_enabled(link)); |
d5ebcf65 YW |
1148 | assert(ret); |
1149 | ||
a27588d4 YW |
1150 | if (link->network->dhcp_pd_uplink_name) |
1151 | r = link_get_by_name(link->manager, link->network->dhcp_pd_uplink_name, &uplink); | |
1152 | else if (link->network->dhcp_pd_uplink_index > 0) | |
1153 | r = link_get_by_index(link->manager, link->network->dhcp_pd_uplink_index, &uplink); | |
1154 | else if (link->network->dhcp_pd_uplink_index == UPLINK_INDEX_SELF) | |
d5ebcf65 YW |
1155 | uplink = link; |
1156 | if (r < 0) | |
1157 | return r; | |
1158 | ||
1159 | if (uplink) { | |
e49bad01 YW |
1160 | if (dhcp4_pd_uplink_is_ready(uplink)) { |
1161 | *ret = uplink; | |
1162 | return AF_INET; | |
1163 | } | |
d5ebcf65 | 1164 | |
e49bad01 YW |
1165 | if (dhcp6_pd_uplink_is_ready(uplink)) { |
1166 | *ret = uplink; | |
1167 | return AF_INET6; | |
1168 | } | |
1169 | ||
1170 | return -EBUSY; | |
d5ebcf65 YW |
1171 | } |
1172 | ||
1173 | HASHMAP_FOREACH(uplink, link->manager->links_by_index) { | |
d5ebcf65 | 1174 | /* Assume that there exists at most one link which acquired delegated prefixes. */ |
e49bad01 YW |
1175 | if (dhcp4_pd_uplink_is_ready(uplink)) { |
1176 | *ret = uplink; | |
1177 | return AF_INET; | |
1178 | } | |
1179 | ||
1180 | if (dhcp6_pd_uplink_is_ready(uplink)) { | |
1181 | *ret = uplink; | |
1182 | return AF_INET6; | |
1183 | } | |
d5ebcf65 YW |
1184 | } |
1185 | ||
1186 | return -ENODEV; | |
1187 | } | |
1188 | ||
a27588d4 | 1189 | int dhcp_request_prefix_delegation(Link *link) { |
d5ebcf65 | 1190 | Link *uplink; |
e49bad01 | 1191 | int r; |
d5ebcf65 YW |
1192 | |
1193 | assert(link); | |
1194 | ||
a27588d4 | 1195 | if (!link_dhcp_pd_is_enabled(link)) |
d5ebcf65 YW |
1196 | return 0; |
1197 | ||
e49bad01 YW |
1198 | r = dhcp_pd_find_uplink(link, &uplink); |
1199 | if (r < 0) | |
d5ebcf65 YW |
1200 | return 0; |
1201 | ||
e49bad01 YW |
1202 | log_link_debug(link, "Requesting subnets of delegated prefixes acquired by DHCPv%c client on %s", |
1203 | r == AF_INET ? '4' : '6', uplink->ifname); | |
1204 | ||
1205 | return r == AF_INET ? | |
1206 | dhcp4_pd_assign_subnet_prefix(link, uplink) : | |
1207 | dhcp6_pd_assign_subnet_prefixes(link, uplink); | |
d5ebcf65 YW |
1208 | } |
1209 | ||
a27588d4 | 1210 | int config_parse_dhcp_pd_subnet_id( |
d5ebcf65 YW |
1211 | const char *unit, |
1212 | const char *filename, | |
1213 | unsigned line, | |
1214 | const char *section, | |
1215 | unsigned section_line, | |
1216 | const char *lvalue, | |
1217 | int ltype, | |
1218 | const char *rvalue, | |
1219 | void *data, | |
1220 | void *userdata) { | |
1221 | ||
99534007 | 1222 | int64_t *p = ASSERT_PTR(data); |
d5ebcf65 YW |
1223 | uint64_t t; |
1224 | int r; | |
1225 | ||
1226 | assert(filename); | |
1227 | assert(lvalue); | |
1228 | assert(rvalue); | |
d5ebcf65 YW |
1229 | |
1230 | if (isempty(rvalue) || streq(rvalue, "auto")) { | |
1231 | *p = -1; | |
1232 | return 0; | |
1233 | } | |
1234 | ||
1235 | r = safe_atoux64(rvalue, &t); | |
1236 | if (r < 0) { | |
1237 | log_syntax(unit, LOG_WARNING, filename, line, r, | |
1238 | "Failed to parse %s=, ignoring assignment: %s", | |
1239 | lvalue, rvalue); | |
1240 | return 0; | |
1241 | } | |
1242 | if (t > INT64_MAX) { | |
1243 | log_syntax(unit, LOG_WARNING, filename, line, 0, | |
1244 | "Invalid subnet id '%s', ignoring assignment.", | |
1245 | rvalue); | |
1246 | return 0; | |
1247 | } | |
1248 | ||
1249 | *p = (int64_t) t; | |
1250 | ||
1251 | return 0; | |
1252 | } |