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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
a13c50e7 | 2 | /*** |
810adae9 | 3 | Copyright © 2014 Intel Corporation. All rights reserved. |
a13c50e7 TG |
4 | ***/ |
5 | ||
23f53b99 | 6 | #include <arpa/inet.h> |
062c020f YW |
7 | #include <netinet/icmp6.h> |
8 | #include <linux/if.h> | |
f4ef1c19 | 9 | #include <linux/if_arp.h> |
a13c50e7 | 10 | |
a13c50e7 TG |
11 | #include "sd-ndisc.h" |
12 | ||
77302468 | 13 | #include "event-util.h" |
d909e4af | 14 | #include "missing_network.h" |
f09a4747 | 15 | #include "networkd-address-generation.h" |
093e3533 | 16 | #include "networkd-address.h" |
ca5ad760 | 17 | #include "networkd-dhcp6.h" |
73854ba1 | 18 | #include "networkd-manager.h" |
1e7a0e21 | 19 | #include "networkd-ndisc.h" |
76c5a0f2 | 20 | #include "networkd-queue.h" |
3b6a3bde | 21 | #include "networkd-route.h" |
3b5a4fc6 | 22 | #include "networkd-state-file.h" |
ac24e418 | 23 | #include "string-table.h" |
5f506a55 | 24 | #include "string-util.h" |
51517f9e | 25 | #include "strv.h" |
1e7a0e21 LP |
26 | |
27 | #define NDISC_DNSSL_MAX 64U | |
28 | #define NDISC_RDNSS_MAX 64U | |
fe307276 | 29 | |
062c020f YW |
30 | bool link_ipv6_accept_ra_enabled(Link *link) { |
31 | assert(link); | |
32 | ||
33 | if (!socket_ipv6_is_supported()) | |
34 | return false; | |
35 | ||
36 | if (link->flags & IFF_LOOPBACK) | |
37 | return false; | |
38 | ||
f4ef1c19 YW |
39 | if (link->iftype == ARPHRD_CAN) |
40 | return false; | |
41 | ||
062c020f YW |
42 | if (!link->network) |
43 | return false; | |
44 | ||
bd7e0a3f | 45 | if (!link_may_have_ipv6ll(link, /* check_multicast = */ true)) |
062c020f YW |
46 | return false; |
47 | ||
3773eb54 YW |
48 | assert(link->network->ipv6_accept_ra >= 0); |
49 | return link->network->ipv6_accept_ra; | |
50 | } | |
51 | ||
52 | void network_adjust_ipv6_accept_ra(Network *network) { | |
53 | assert(network); | |
54 | ||
55 | if (!FLAGS_SET(network->link_local, ADDRESS_FAMILY_IPV6)) { | |
56 | if (network->ipv6_accept_ra > 0) | |
f81ac115 | 57 | log_warning("%s: IPv6AcceptRA= is enabled but IPv6 link-local addressing is disabled or not supported. " |
3773eb54 YW |
58 | "Disabling IPv6AcceptRA=.", network->filename); |
59 | network->ipv6_accept_ra = false; | |
60 | } | |
61 | ||
62 | if (network->ipv6_accept_ra < 0) | |
062c020f | 63 | /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */ |
3773eb54 | 64 | network->ipv6_accept_ra = !FLAGS_SET(network->ip_forward, ADDRESS_FAMILY_IPV6); |
de6b6ff8 | 65 | |
75d26411 YW |
66 | /* When RouterAllowList=, PrefixAllowList= or RouteAllowList= are specified, then |
67 | * RouterDenyList=, PrefixDenyList= or RouteDenyList= are ignored, respectively. */ | |
68 | if (!set_isempty(network->ndisc_allow_listed_router)) | |
69 | network->ndisc_deny_listed_router = set_free_free(network->ndisc_deny_listed_router); | |
de6b6ff8 SS |
70 | if (!set_isempty(network->ndisc_allow_listed_prefix)) |
71 | network->ndisc_deny_listed_prefix = set_free_free(network->ndisc_deny_listed_prefix); | |
72 | if (!set_isempty(network->ndisc_allow_listed_route_prefix)) | |
73 | network->ndisc_deny_listed_route_prefix = set_free_free(network->ndisc_deny_listed_route_prefix); | |
062c020f YW |
74 | } |
75 | ||
3b6a3bde | 76 | static int ndisc_check_ready(Link *link); |
50550722 | 77 | |
3b6a3bde YW |
78 | static int ndisc_address_ready_callback(Address *address) { |
79 | Address *a; | |
50550722 | 80 | |
3b6a3bde YW |
81 | assert(address); |
82 | assert(address->link); | |
50550722 | 83 | |
3b6a3bde YW |
84 | SET_FOREACH(a, address->link->addresses) |
85 | if (a->source == NETWORK_CONFIG_SOURCE_NDISC) | |
86 | a->callback = NULL; | |
50550722 | 87 | |
3b6a3bde YW |
88 | return ndisc_check_ready(address->link); |
89 | } | |
50550722 | 90 | |
3b6a3bde YW |
91 | static int ndisc_check_ready(Link *link) { |
92 | bool found = false, ready = false; | |
93 | Address *address; | |
50550722 | 94 | |
3b6a3bde | 95 | assert(link); |
50550722 | 96 | |
3b6a3bde YW |
97 | if (link->ndisc_messages > 0) { |
98 | log_link_debug(link, "%s(): SLAAC addresses and routes are not set.", __func__); | |
99 | return 0; | |
100 | } | |
50550722 | 101 | |
3b6a3bde YW |
102 | SET_FOREACH(address, link->addresses) { |
103 | if (address->source != NETWORK_CONFIG_SOURCE_NDISC) | |
104 | continue; | |
50550722 | 105 | |
3b6a3bde | 106 | found = true; |
50550722 | 107 | |
3b6a3bde YW |
108 | if (address_is_ready(address)) { |
109 | ready = true; | |
110 | break; | |
50550722 | 111 | } |
3b6a3bde | 112 | } |
50550722 | 113 | |
3b6a3bde YW |
114 | if (found && !ready) { |
115 | SET_FOREACH(address, link->addresses) | |
116 | if (address->source == NETWORK_CONFIG_SOURCE_NDISC) | |
117 | address->callback = ndisc_address_ready_callback; | |
50550722 | 118 | |
3b6a3bde YW |
119 | log_link_debug(link, "%s(): no SLAAC address is ready.", __func__); |
120 | return 0; | |
50550722 YW |
121 | } |
122 | ||
3b6a3bde YW |
123 | link->ndisc_configured = true; |
124 | log_link_debug(link, "SLAAC addresses and routes set."); | |
50550722 | 125 | |
3b6a3bde YW |
126 | link_check_ready(link); |
127 | return 0; | |
50550722 YW |
128 | } |
129 | ||
80d62d4f | 130 | static int ndisc_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Route *route) { |
3b015d40 TG |
131 | int r; |
132 | ||
133 | assert(link); | |
3b015d40 | 134 | |
5a07fa9d YW |
135 | r = route_configure_handler_internal(rtnl, m, link, "Could not set NDisc route"); |
136 | if (r <= 0) | |
137 | return r; | |
3b015d40 | 138 | |
3b6a3bde | 139 | r = ndisc_check_ready(link); |
50550722 | 140 | if (r < 0) |
3b6a3bde | 141 | link_enter_failed(link); |
76c5a0f2 | 142 | |
3b6a3bde | 143 | return 1; |
76c5a0f2 YW |
144 | } |
145 | ||
6f812d28 YW |
146 | static void ndisc_set_route_priority(Link *link, Route *route) { |
147 | assert(link); | |
148 | assert(route); | |
149 | ||
150 | if (route->priority_set) | |
151 | return; /* explicitly configured. */ | |
152 | ||
153 | switch (route->pref) { | |
154 | case SD_NDISC_PREFERENCE_LOW: | |
155 | route->priority = link->network->ipv6_accept_ra_route_metric_low; | |
156 | break; | |
157 | case SD_NDISC_PREFERENCE_MEDIUM: | |
158 | route->priority = link->network->ipv6_accept_ra_route_metric_medium; | |
159 | break; | |
160 | case SD_NDISC_PREFERENCE_HIGH: | |
161 | route->priority = link->network->ipv6_accept_ra_route_metric_high; | |
162 | break; | |
163 | default: | |
164 | assert_not_reached(); | |
165 | } | |
166 | } | |
167 | ||
76c5a0f2 YW |
168 | static int ndisc_request_route(Route *in, Link *link, sd_ndisc_router *rt) { |
169 | _cleanup_(route_freep) Route *route = in; | |
3b6a3bde | 170 | struct in6_addr router; |
d9a95033 | 171 | bool is_new; |
76c5a0f2 YW |
172 | int r; |
173 | ||
174 | assert(route); | |
175 | assert(link); | |
f95fb199 | 176 | assert(link->network); |
76c5a0f2 YW |
177 | assert(rt); |
178 | ||
3b6a3bde YW |
179 | r = sd_ndisc_router_get_address(rt, &router); |
180 | if (r < 0) | |
181 | return r; | |
182 | ||
183 | route->source = NETWORK_CONFIG_SOURCE_NDISC; | |
184 | route->provider.in6 = router; | |
429dc05a YW |
185 | if (!route->table_set) |
186 | route->table = link_get_ipv6_accept_ra_route_table(link); | |
6f812d28 | 187 | ndisc_set_route_priority(link, route); |
429dc05a YW |
188 | if (!route->protocol_set) |
189 | route->protocol = RTPROT_RA; | |
f95fb199 YW |
190 | if (route->quickack < 0) |
191 | route->quickack = link->network->ipv6_accept_ra_quickack; | |
429dc05a | 192 | |
d9a95033 YW |
193 | is_new = route_get(NULL, link, route, NULL) < 0; |
194 | ||
195 | r = link_request_route(link, TAKE_PTR(route), true, &link->ndisc_messages, | |
196 | ndisc_route_handler, NULL); | |
197 | if (r < 0) | |
198 | return r; | |
199 | if (r > 0 && is_new) | |
3b6a3bde | 200 | link->ndisc_configured = false; |
50550722 | 201 | |
d9a95033 | 202 | return 0; |
50550722 YW |
203 | } |
204 | ||
80d62d4f | 205 | static int ndisc_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Address *address) { |
73854ba1 YW |
206 | int r; |
207 | ||
208 | assert(link); | |
73854ba1 | 209 | |
5a07fa9d YW |
210 | r = address_configure_handler_internal(rtnl, m, link, "Could not set NDisc address"); |
211 | if (r <= 0) | |
212 | return r; | |
73854ba1 | 213 | |
3b6a3bde | 214 | r = ndisc_check_ready(link); |
50550722 | 215 | if (r < 0) |
3b6a3bde | 216 | link_enter_failed(link); |
69203fba | 217 | |
3b6a3bde | 218 | return 1; |
69203fba YW |
219 | } |
220 | ||
76c5a0f2 YW |
221 | static int ndisc_request_address(Address *in, Link *link, sd_ndisc_router *rt) { |
222 | _cleanup_(address_freep) Address *address = in; | |
3b6a3bde | 223 | struct in6_addr router; |
d9a95033 | 224 | bool is_new; |
76c5a0f2 YW |
225 | int r; |
226 | ||
227 | assert(address); | |
228 | assert(link); | |
229 | assert(rt); | |
230 | ||
3b6a3bde YW |
231 | r = sd_ndisc_router_get_address(rt, &router); |
232 | if (r < 0) | |
76c5a0f2 YW |
233 | return r; |
234 | ||
3b6a3bde YW |
235 | address->source = NETWORK_CONFIG_SOURCE_NDISC; |
236 | address->provider.in6 = router; | |
76c5a0f2 | 237 | |
4b3590c3 TM |
238 | r = free_and_strdup_warn(&address->netlabel, link->network->ndisc_netlabel); |
239 | if (r < 0) | |
240 | return r; | |
241 | ||
d9a95033 YW |
242 | is_new = address_get(link, address, NULL) < 0; |
243 | ||
244 | r = link_request_address(link, TAKE_PTR(address), true, &link->ndisc_messages, | |
245 | ndisc_address_handler, NULL); | |
246 | if (r < 0) | |
247 | return r; | |
248 | if (r > 0 && is_new) | |
3b6a3bde | 249 | link->ndisc_configured = false; |
3b6a3bde | 250 | |
d9a95033 | 251 | return 0; |
76c5a0f2 YW |
252 | } |
253 | ||
d5017c84 | 254 | static int ndisc_router_process_default(Link *link, sd_ndisc_router *rt) { |
91fc5135 | 255 | usec_t lifetime_usec, timestamp_usec; |
b8ce3b44 | 256 | struct in6_addr gateway; |
91fc5135 | 257 | uint16_t lifetime_sec; |
1e7a0e21 | 258 | unsigned preference; |
91fc5135 | 259 | uint32_t mtu = 0; |
13e8a49a | 260 | int r; |
3b015d40 | 261 | |
3b015d40 | 262 | assert(link); |
610c0db1 | 263 | assert(link->network); |
1e7a0e21 | 264 | assert(rt); |
3b015d40 | 265 | |
610c0db1 YW |
266 | if (!link->network->ipv6_accept_ra_use_gateway && |
267 | hashmap_isempty(link->network->routes_by_section)) | |
268 | return 0; | |
269 | ||
91fc5135 | 270 | r = sd_ndisc_router_get_lifetime(rt, &lifetime_sec); |
d5017c84 | 271 | if (r < 0) |
13e8a49a | 272 | return log_link_error_errno(link, r, "Failed to get gateway lifetime from RA: %m"); |
d5017c84 | 273 | |
ba4e0427 | 274 | r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); |
91fc5135 YW |
275 | if (r < 0) |
276 | return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); | |
277 | ||
5235d739 | 278 | lifetime_usec = sec16_to_usec(lifetime_sec, timestamp_usec); |
91fc5135 | 279 | |
b8ce3b44 | 280 | r = sd_ndisc_router_get_address(rt, &gateway); |
d5017c84 | 281 | if (r < 0) |
13e8a49a | 282 | return log_link_error_errno(link, r, "Failed to get gateway address from RA: %m"); |
1e7a0e21 | 283 | |
5d003031 | 284 | if (link_get_ipv6_address(link, &gateway, 0, NULL) >= 0) { |
84dbb3fd | 285 | if (DEBUG_LOGGING) |
5eec0a08 | 286 | log_link_debug(link, "No NDisc route added, gateway %s matches local address", |
84dbb3fd | 287 | IN6_ADDR_TO_STRING(&gateway)); |
5eec0a08 | 288 | return 0; |
ce2ea782 | 289 | } |
6d7c7615 | 290 | |
1e7a0e21 | 291 | r = sd_ndisc_router_get_preference(rt, &preference); |
d5017c84 | 292 | if (r < 0) |
13e8a49a | 293 | return log_link_error_errno(link, r, "Failed to get default router preference from RA: %m"); |
1e7a0e21 | 294 | |
7d93b92f YW |
295 | if (link->network->ipv6_accept_ra_use_mtu) { |
296 | r = sd_ndisc_router_get_mtu(rt, &mtu); | |
297 | if (r < 0 && r != -ENODATA) | |
298 | return log_link_error_errno(link, r, "Failed to get default router MTU from RA: %m"); | |
299 | } | |
d6fceaf1 | 300 | |
610c0db1 YW |
301 | if (link->network->ipv6_accept_ra_use_gateway) { |
302 | _cleanup_(route_freep) Route *route = NULL; | |
1e7a0e21 | 303 | |
610c0db1 YW |
304 | r = route_new(&route); |
305 | if (r < 0) | |
306 | return log_oom(); | |
1e7a0e21 | 307 | |
610c0db1 YW |
308 | route->family = AF_INET6; |
309 | route->pref = preference; | |
310 | route->gw_family = AF_INET6; | |
311 | route->gw.in6 = gateway; | |
312 | route->lifetime_usec = lifetime_usec; | |
313 | route->mtu = mtu; | |
314 | ||
315 | r = ndisc_request_route(TAKE_PTR(route), link, rt); | |
316 | if (r < 0) | |
317 | return log_link_error_errno(link, r, "Could not request default route: %m"); | |
318 | } | |
d5017c84 | 319 | |
1985c54f | 320 | Route *route_gw; |
2a54a044 | 321 | HASHMAP_FOREACH(route_gw, link->network->routes_by_section) { |
610c0db1 YW |
322 | _cleanup_(route_freep) Route *route = NULL; |
323 | ||
1a3a6309 | 324 | if (!route_gw->gateway_from_dhcp_or_ra) |
1985c54f YW |
325 | continue; |
326 | ||
5bb80a46 | 327 | if (route_gw->gw_family != AF_INET6) |
1985c54f YW |
328 | continue; |
329 | ||
76c5a0f2 YW |
330 | r = route_dup(route_gw, &route); |
331 | if (r < 0) | |
332 | return r; | |
333 | ||
334 | route->gw.in6 = gateway; | |
76c5a0f2 YW |
335 | if (!route->pref_set) |
336 | route->pref = preference; | |
91fc5135 | 337 | route->lifetime_usec = lifetime_usec; |
76c5a0f2 YW |
338 | if (route->mtu == 0) |
339 | route->mtu = mtu; | |
340 | ||
341 | r = ndisc_request_route(TAKE_PTR(route), link, rt); | |
13e8a49a | 342 | if (r < 0) |
76c5a0f2 | 343 | return log_link_error_errno(link, r, "Could not request gateway: %m"); |
1985c54f YW |
344 | } |
345 | ||
d5017c84 | 346 | return 0; |
1e7a0e21 LP |
347 | } |
348 | ||
d5017c84 | 349 | static int ndisc_router_process_autonomous_prefix(Link *link, sd_ndisc_router *rt) { |
16bc8635 YW |
350 | uint32_t lifetime_valid_sec, lifetime_preferred_sec; |
351 | usec_t lifetime_valid_usec, lifetime_preferred_usec, timestamp_usec; | |
d207581f | 352 | _cleanup_set_free_ Set *addresses = NULL; |
151b8ea3 | 353 | struct in6_addr prefix, *a; |
1e7a0e21 LP |
354 | unsigned prefixlen; |
355 | int r; | |
356 | ||
357 | assert(link); | |
fbdda4bb | 358 | assert(link->network); |
1e7a0e21 LP |
359 | assert(rt); |
360 | ||
fbdda4bb YW |
361 | if (!link->network->ipv6_accept_ra_use_autonomous_prefix) |
362 | return 0; | |
363 | ||
ba4e0427 | 364 | r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); |
d5017c84 | 365 | if (r < 0) |
13e8a49a | 366 | return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
6554550f | 367 | |
151b8ea3 YW |
368 | r = sd_ndisc_router_prefix_get_address(rt, &prefix); |
369 | if (r < 0) | |
370 | return log_link_error_errno(link, r, "Failed to get prefix address: %m"); | |
371 | ||
1e7a0e21 | 372 | r = sd_ndisc_router_prefix_get_prefixlen(rt, &prefixlen); |
d5017c84 YW |
373 | if (r < 0) |
374 | return log_link_error_errno(link, r, "Failed to get prefix length: %m"); | |
1e7a0e21 | 375 | |
868bd1aa | 376 | /* ndisc_generate_addresses() below requires the prefix length <= 64. */ |
151b8ea3 | 377 | if (prefixlen > 64) { |
c71384a9 ZJS |
378 | log_link_debug(link, "Prefix is longer than 64, ignoring autonomous prefix %s.", |
379 | IN6_ADDR_PREFIX_TO_STRING(&prefix, prefixlen)); | |
151b8ea3 YW |
380 | return 0; |
381 | } | |
382 | ||
16bc8635 | 383 | r = sd_ndisc_router_prefix_get_valid_lifetime(rt, &lifetime_valid_sec); |
d5017c84 YW |
384 | if (r < 0) |
385 | return log_link_error_errno(link, r, "Failed to get prefix valid lifetime: %m"); | |
1e7a0e21 | 386 | |
16bc8635 | 387 | r = sd_ndisc_router_prefix_get_preferred_lifetime(rt, &lifetime_preferred_sec); |
d5017c84 YW |
388 | if (r < 0) |
389 | return log_link_error_errno(link, r, "Failed to get prefix preferred lifetime: %m"); | |
3b015d40 | 390 | |
92bdc3ff | 391 | /* The preferred lifetime is never greater than the valid lifetime */ |
16bc8635 | 392 | if (lifetime_preferred_sec > lifetime_valid_sec) |
d5017c84 | 393 | return 0; |
92bdc3ff | 394 | |
5235d739 YW |
395 | lifetime_valid_usec = sec_to_usec(lifetime_valid_sec, timestamp_usec); |
396 | lifetime_preferred_usec = sec_to_usec(lifetime_preferred_sec, timestamp_usec); | |
16bc8635 | 397 | |
868bd1aa | 398 | r = ndisc_generate_addresses(link, &prefix, prefixlen, &addresses); |
5f506a55 | 399 | if (r < 0) |
d207581f | 400 | return log_link_error_errno(link, r, "Failed to generate SLAAC addresses: %m"); |
c24c83dc | 401 | |
90e74a66 | 402 | SET_FOREACH(a, addresses) { |
76c5a0f2 | 403 | _cleanup_(address_freep) Address *address = NULL; |
13e8a49a | 404 | |
76c5a0f2 YW |
405 | r = address_new(&address); |
406 | if (r < 0) | |
407 | return log_oom(); | |
408 | ||
409 | address->family = AF_INET6; | |
25db3aea | 410 | address->in_addr.in6 = *a; |
76c5a0f2 YW |
411 | address->prefixlen = prefixlen; |
412 | address->flags = IFA_F_NOPREFIXROUTE|IFA_F_MANAGETEMPADDR; | |
16bc8635 YW |
413 | address->lifetime_valid_usec = lifetime_valid_usec; |
414 | address->lifetime_preferred_usec = lifetime_preferred_usec; | |
fe841414 | 415 | |
76c5a0f2 | 416 | r = ndisc_request_address(TAKE_PTR(address), link, rt); |
13e8a49a | 417 | if (r < 0) |
76c5a0f2 | 418 | return log_link_error_errno(link, r, "Could not request SLAAC address: %m"); |
3b015d40 | 419 | } |
d5017c84 YW |
420 | |
421 | return 0; | |
3b015d40 TG |
422 | } |
423 | ||
d5017c84 | 424 | static int ndisc_router_process_onlink_prefix(Link *link, sd_ndisc_router *rt) { |
8e766630 | 425 | _cleanup_(route_freep) Route *route = NULL; |
91fc5135 YW |
426 | usec_t timestamp_usec; |
427 | uint32_t lifetime_sec; | |
167c7ae5 | 428 | struct in6_addr prefix; |
1e7a0e21 | 429 | unsigned prefixlen; |
3b015d40 TG |
430 | int r; |
431 | ||
3b015d40 | 432 | assert(link); |
fbdda4bb | 433 | assert(link->network); |
1e7a0e21 | 434 | assert(rt); |
3b015d40 | 435 | |
fbdda4bb YW |
436 | if (!link->network->ipv6_accept_ra_use_onlink_prefix) |
437 | return 0; | |
438 | ||
09845af5 YW |
439 | r = sd_ndisc_router_prefix_get_valid_lifetime(rt, &lifetime_sec); |
440 | if (r < 0) | |
441 | return log_link_error_errno(link, r, "Failed to get prefix lifetime: %m"); | |
442 | ||
ba4e0427 | 443 | r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); |
d5017c84 | 444 | if (r < 0) |
13e8a49a | 445 | return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
1e7a0e21 | 446 | |
167c7ae5 YW |
447 | r = sd_ndisc_router_prefix_get_address(rt, &prefix); |
448 | if (r < 0) | |
449 | return log_link_error_errno(link, r, "Failed to get prefix address: %m"); | |
450 | ||
1e7a0e21 | 451 | r = sd_ndisc_router_prefix_get_prefixlen(rt, &prefixlen); |
d5017c84 YW |
452 | if (r < 0) |
453 | return log_link_error_errno(link, r, "Failed to get prefix length: %m"); | |
1e7a0e21 | 454 | |
3b015d40 | 455 | r = route_new(&route); |
d5017c84 | 456 | if (r < 0) |
13e8a49a | 457 | return log_oom(); |
3b015d40 | 458 | |
3b015d40 | 459 | route->family = AF_INET6; |
167c7ae5 | 460 | route->dst.in6 = prefix; |
3b015d40 | 461 | route->dst_prefixlen = prefixlen; |
5235d739 | 462 | route->lifetime_usec = sec_to_usec(lifetime_sec, timestamp_usec); |
3b015d40 | 463 | |
76c5a0f2 | 464 | r = ndisc_request_route(TAKE_PTR(route), link, rt); |
13e8a49a | 465 | if (r < 0) |
891fc28b | 466 | return log_link_error_errno(link, r, "Could not request prefix route: %m"); |
d5017c84 YW |
467 | |
468 | return 0; | |
3b015d40 TG |
469 | } |
470 | ||
fbdda4bb YW |
471 | static int ndisc_router_process_prefix(Link *link, sd_ndisc_router *rt) { |
472 | unsigned prefixlen; | |
473 | struct in6_addr a; | |
474 | uint8_t flags; | |
475 | int r; | |
476 | ||
477 | assert(link); | |
478 | assert(link->network); | |
479 | assert(rt); | |
480 | ||
481 | r = sd_ndisc_router_prefix_get_address(rt, &a); | |
482 | if (r < 0) | |
483 | return log_link_error_errno(link, r, "Failed to get prefix address: %m"); | |
484 | ||
a115c60e YW |
485 | /* RFC 4861 Section 4.6.2: |
486 | * A router SHOULD NOT send a prefix option for the link-local prefix and a host SHOULD ignore such | |
487 | * a prefix option. */ | |
488 | if (in6_addr_is_link_local(&a)) { | |
489 | log_link_debug(link, "Received link-local prefix, ignoring autonomous prefix."); | |
490 | return 0; | |
491 | } | |
492 | ||
fbdda4bb YW |
493 | r = sd_ndisc_router_prefix_get_prefixlen(rt, &prefixlen); |
494 | if (r < 0) | |
495 | return log_link_error_errno(link, r, "Failed to get prefix length: %m"); | |
496 | ||
497 | if (in6_prefix_is_filtered(&a, prefixlen, link->network->ndisc_allow_listed_prefix, link->network->ndisc_deny_listed_prefix)) { | |
c71384a9 ZJS |
498 | if (DEBUG_LOGGING) |
499 | log_link_debug(link, "Prefix '%s' is %s, ignoring", | |
500 | !set_isempty(link->network->ndisc_allow_listed_prefix) ? "not in allow list" | |
501 | : "in deny list", | |
502 | IN6_ADDR_PREFIX_TO_STRING(&a, prefixlen)); | |
fbdda4bb YW |
503 | return 0; |
504 | } | |
505 | ||
506 | r = sd_ndisc_router_prefix_get_flags(rt, &flags); | |
507 | if (r < 0) | |
508 | return log_link_error_errno(link, r, "Failed to get RA prefix flags: %m"); | |
509 | ||
510 | if (FLAGS_SET(flags, ND_OPT_PI_FLAG_ONLINK)) { | |
511 | r = ndisc_router_process_onlink_prefix(link, rt); | |
512 | if (r < 0) | |
513 | return r; | |
514 | } | |
515 | ||
516 | if (FLAGS_SET(flags, ND_OPT_PI_FLAG_AUTO)) { | |
517 | r = ndisc_router_process_autonomous_prefix(link, rt); | |
518 | if (r < 0) | |
519 | return r; | |
520 | } | |
521 | ||
522 | return 0; | |
523 | } | |
524 | ||
d5017c84 | 525 | static int ndisc_router_process_route(Link *link, sd_ndisc_router *rt) { |
8e766630 | 526 | _cleanup_(route_freep) Route *route = NULL; |
1e7a0e21 | 527 | unsigned preference, prefixlen; |
91fc5135 YW |
528 | struct in6_addr gateway, dst; |
529 | uint32_t lifetime_sec; | |
530 | usec_t timestamp_usec; | |
7a695d8e | 531 | int r; |
a13c50e7 TG |
532 | |
533 | assert(link); | |
a13c50e7 | 534 | |
610c0db1 YW |
535 | if (!link->network->ipv6_accept_ra_use_route_prefix) |
536 | return 0; | |
537 | ||
91fc5135 | 538 | r = sd_ndisc_router_route_get_lifetime(rt, &lifetime_sec); |
d5017c84 | 539 | if (r < 0) |
a19b1ac7 | 540 | return log_link_error_errno(link, r, "Failed to get route lifetime from RA: %m"); |
d5017c84 | 541 | |
b8ce3b44 | 542 | r = sd_ndisc_router_route_get_address(rt, &dst); |
d5017c84 | 543 | if (r < 0) |
a19b1ac7 | 544 | return log_link_error_errno(link, r, "Failed to get route destination address: %m"); |
3b015d40 | 545 | |
c995fa02 YW |
546 | r = sd_ndisc_router_route_get_prefixlen(rt, &prefixlen); |
547 | if (r < 0) | |
548 | return log_link_error_errno(link, r, "Failed to get route prefix length: %m"); | |
549 | ||
80bfc3b9 YW |
550 | if (in6_addr_is_null(&dst) && prefixlen == 0) { |
551 | log_link_debug(link, "Route prefix is ::/0, ignoring"); | |
552 | return 0; | |
553 | } | |
554 | ||
c71384a9 ZJS |
555 | if (in6_prefix_is_filtered(&dst, prefixlen, |
556 | link->network->ndisc_allow_listed_route_prefix, | |
557 | link->network->ndisc_deny_listed_route_prefix)) { | |
16c89e64 | 558 | |
c71384a9 ZJS |
559 | if (DEBUG_LOGGING) |
560 | log_link_debug(link, "Route prefix %s is %s, ignoring", | |
561 | !set_isempty(link->network->ndisc_allow_listed_route_prefix) ? "not in allow list" | |
562 | : "in deny list", | |
563 | IN6_ADDR_PREFIX_TO_STRING(&dst, prefixlen)); | |
16c89e64 DP |
564 | return 0; |
565 | } | |
566 | ||
b8ce3b44 | 567 | r = sd_ndisc_router_get_address(rt, &gateway); |
19e334bd YW |
568 | if (r < 0) |
569 | return log_link_error_errno(link, r, "Failed to get gateway address from RA: %m"); | |
570 | ||
5d003031 | 571 | if (link_get_ipv6_address(link, &gateway, 0, NULL) >= 0) { |
84dbb3fd ZJS |
572 | if (DEBUG_LOGGING) |
573 | log_link_debug(link, "Advertised route gateway %s is local to the link, ignoring route", | |
574 | IN6_ADDR_TO_STRING(&gateway)); | |
22101916 DP |
575 | return 0; |
576 | } | |
577 | ||
1e7a0e21 | 578 | r = sd_ndisc_router_route_get_preference(rt, &preference); |
d5017c84 | 579 | if (r < 0) |
13e8a49a | 580 | return log_link_error_errno(link, r, "Failed to get default router preference from RA: %m"); |
1e7a0e21 | 581 | |
ba4e0427 | 582 | r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); |
d5017c84 | 583 | if (r < 0) |
13e8a49a | 584 | return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
3b015d40 TG |
585 | |
586 | r = route_new(&route); | |
d5017c84 | 587 | if (r < 0) |
13e8a49a | 588 | return log_oom(); |
3b015d40 | 589 | |
3b015d40 | 590 | route->family = AF_INET6; |
1e7a0e21 | 591 | route->pref = preference; |
b8ce3b44 | 592 | route->gw.in6 = gateway; |
6dd53981 | 593 | route->gw_family = AF_INET6; |
b8ce3b44 | 594 | route->dst.in6 = dst; |
1e7a0e21 | 595 | route->dst_prefixlen = prefixlen; |
5235d739 | 596 | route->lifetime_usec = sec_to_usec(lifetime_sec, timestamp_usec); |
3b015d40 | 597 | |
76c5a0f2 | 598 | r = ndisc_request_route(TAKE_PTR(route), link, rt); |
13e8a49a | 599 | if (r < 0) |
76c5a0f2 | 600 | return log_link_error_errno(link, r, "Could not request additional route: %m"); |
d5017c84 YW |
601 | |
602 | return 0; | |
9d96e6c3 | 603 | } |
a13c50e7 | 604 | |
7a08d314 | 605 | static void ndisc_rdnss_hash_func(const NDiscRDNSS *x, struct siphash *state) { |
1e7a0e21 LP |
606 | siphash24_compress(&x->address, sizeof(x->address), state); |
607 | } | |
608 | ||
7a08d314 | 609 | static int ndisc_rdnss_compare_func(const NDiscRDNSS *a, const NDiscRDNSS *b) { |
1e7a0e21 LP |
610 | return memcmp(&a->address, &b->address, sizeof(a->address)); |
611 | } | |
612 | ||
b0b97766 YW |
613 | DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR( |
614 | ndisc_rdnss_hash_ops, | |
615 | NDiscRDNSS, | |
616 | ndisc_rdnss_hash_func, | |
617 | ndisc_rdnss_compare_func, | |
618 | free); | |
1e7a0e21 | 619 | |
d5017c84 | 620 | static int ndisc_router_process_rdnss(Link *link, sd_ndisc_router *rt) { |
03ccc4b4 YW |
621 | usec_t lifetime_usec, timestamp_usec; |
622 | uint32_t lifetime_sec; | |
1e7a0e21 | 623 | const struct in6_addr *a; |
50550722 | 624 | struct in6_addr router; |
8aba7b83 | 625 | bool updated = false, logged_about_too_many = false; |
13e8a49a | 626 | int n, r; |
1e7a0e21 LP |
627 | |
628 | assert(link); | |
ad0b2df6 | 629 | assert(link->network); |
1e7a0e21 LP |
630 | assert(rt); |
631 | ||
ad0b2df6 YW |
632 | if (!link->network->ipv6_accept_ra_use_dns) |
633 | return 0; | |
634 | ||
50550722 YW |
635 | r = sd_ndisc_router_get_address(rt, &router); |
636 | if (r < 0) | |
637 | return log_link_error_errno(link, r, "Failed to get router address from RA: %m"); | |
638 | ||
ba4e0427 | 639 | r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); |
d5017c84 | 640 | if (r < 0) |
13e8a49a | 641 | return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
1e7a0e21 | 642 | |
03ccc4b4 | 643 | r = sd_ndisc_router_rdnss_get_lifetime(rt, &lifetime_sec); |
d5017c84 | 644 | if (r < 0) |
13e8a49a | 645 | return log_link_error_errno(link, r, "Failed to get RDNSS lifetime: %m"); |
1e7a0e21 | 646 | |
5235d739 | 647 | lifetime_usec = sec_to_usec(lifetime_sec, timestamp_usec); |
03ccc4b4 | 648 | |
1e7a0e21 | 649 | n = sd_ndisc_router_rdnss_get_addresses(rt, &a); |
d5017c84 | 650 | if (n < 0) |
13e8a49a | 651 | return log_link_error_errno(link, n, "Failed to get RDNSS addresses: %m"); |
1e7a0e21 | 652 | |
b0b97766 YW |
653 | for (int j = 0; j < n; j++) { |
654 | _cleanup_free_ NDiscRDNSS *x = NULL; | |
3b6a3bde | 655 | NDiscRDNSS *rdnss, d = { |
b0b97766 YW |
656 | .address = a[j], |
657 | }; | |
1e7a0e21 | 658 | |
af2aea8b YW |
659 | if (lifetime_usec == 0) { |
660 | /* The entry is outdated. */ | |
661 | free(set_remove(link->ndisc_rdnss, &d)); | |
662 | updated = true; | |
663 | continue; | |
664 | } | |
665 | ||
b0b97766 YW |
666 | rdnss = set_get(link->ndisc_rdnss, &d); |
667 | if (rdnss) { | |
50550722 | 668 | rdnss->router = router; |
03ccc4b4 | 669 | rdnss->lifetime_usec = lifetime_usec; |
1e7a0e21 LP |
670 | continue; |
671 | } | |
672 | ||
8aba7b83 YW |
673 | if (set_size(link->ndisc_rdnss) >= NDISC_RDNSS_MAX) { |
674 | if (!logged_about_too_many) | |
675 | log_link_warning(link, "Too many RDNSS records per link. Only first %u records will be used.", NDISC_RDNSS_MAX); | |
676 | logged_about_too_many = true; | |
677 | continue; | |
678 | } | |
679 | ||
d5017c84 YW |
680 | x = new(NDiscRDNSS, 1); |
681 | if (!x) | |
682 | return log_oom(); | |
1e7a0e21 | 683 | |
d5017c84 | 684 | *x = (NDiscRDNSS) { |
b0b97766 | 685 | .address = a[j], |
50550722 | 686 | .router = router, |
03ccc4b4 | 687 | .lifetime_usec = lifetime_usec, |
d5017c84 | 688 | }; |
1e7a0e21 | 689 | |
35e601d4 | 690 | r = set_ensure_consume(&link->ndisc_rdnss, &ndisc_rdnss_hash_ops, TAKE_PTR(x)); |
d5017c84 YW |
691 | if (r < 0) |
692 | return log_oom(); | |
1e7a0e21 | 693 | assert(r > 0); |
9092113d YW |
694 | |
695 | updated = true; | |
1e7a0e21 | 696 | } |
d5017c84 | 697 | |
9092113d YW |
698 | if (updated) |
699 | link_dirty(link); | |
700 | ||
d5017c84 | 701 | return 0; |
1e7a0e21 LP |
702 | } |
703 | ||
7a08d314 | 704 | static void ndisc_dnssl_hash_func(const NDiscDNSSL *x, struct siphash *state) { |
f281fc1e | 705 | siphash24_compress_string(NDISC_DNSSL_DOMAIN(x), state); |
1e7a0e21 LP |
706 | } |
707 | ||
7a08d314 | 708 | static int ndisc_dnssl_compare_func(const NDiscDNSSL *a, const NDiscDNSSL *b) { |
1e7a0e21 LP |
709 | return strcmp(NDISC_DNSSL_DOMAIN(a), NDISC_DNSSL_DOMAIN(b)); |
710 | } | |
711 | ||
b0b97766 YW |
712 | DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR( |
713 | ndisc_dnssl_hash_ops, | |
714 | NDiscDNSSL, | |
715 | ndisc_dnssl_hash_func, | |
716 | ndisc_dnssl_compare_func, | |
717 | free); | |
1e7a0e21 | 718 | |
13e8a49a | 719 | static int ndisc_router_process_dnssl(Link *link, sd_ndisc_router *rt) { |
1e7a0e21 | 720 | _cleanup_strv_free_ char **l = NULL; |
03ccc4b4 | 721 | usec_t lifetime_usec, timestamp_usec; |
50550722 | 722 | struct in6_addr router; |
03ccc4b4 | 723 | uint32_t lifetime_sec; |
8aba7b83 | 724 | bool updated = false, logged_about_too_many = false; |
1e7a0e21 LP |
725 | int r; |
726 | ||
727 | assert(link); | |
ad0b2df6 | 728 | assert(link->network); |
1e7a0e21 LP |
729 | assert(rt); |
730 | ||
ad0b2df6 YW |
731 | if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_NO) |
732 | return 0; | |
733 | ||
50550722 YW |
734 | r = sd_ndisc_router_get_address(rt, &router); |
735 | if (r < 0) | |
736 | return log_link_error_errno(link, r, "Failed to get router address from RA: %m"); | |
737 | ||
ba4e0427 | 738 | r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); |
13e8a49a YW |
739 | if (r < 0) |
740 | return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); | |
1e7a0e21 | 741 | |
03ccc4b4 | 742 | r = sd_ndisc_router_dnssl_get_lifetime(rt, &lifetime_sec); |
13e8a49a YW |
743 | if (r < 0) |
744 | return log_link_error_errno(link, r, "Failed to get DNSSL lifetime: %m"); | |
1e7a0e21 | 745 | |
5235d739 | 746 | lifetime_usec = sec_to_usec(lifetime_sec, timestamp_usec); |
03ccc4b4 | 747 | |
1e7a0e21 | 748 | r = sd_ndisc_router_dnssl_get_domains(rt, &l); |
13e8a49a YW |
749 | if (r < 0) |
750 | return log_link_error_errno(link, r, "Failed to get DNSSL addresses: %m"); | |
1e7a0e21 | 751 | |
b0b97766 YW |
752 | STRV_FOREACH(j, l) { |
753 | _cleanup_free_ NDiscDNSSL *s = NULL; | |
3b6a3bde | 754 | NDiscDNSSL *dnssl; |
1e7a0e21 | 755 | |
b0b97766 YW |
756 | s = malloc0(ALIGN(sizeof(NDiscDNSSL)) + strlen(*j) + 1); |
757 | if (!s) | |
758 | return log_oom(); | |
1e7a0e21 | 759 | |
b0b97766 | 760 | strcpy(NDISC_DNSSL_DOMAIN(s), *j); |
1e7a0e21 | 761 | |
af2aea8b YW |
762 | if (lifetime_usec == 0) { |
763 | /* The entry is outdated. */ | |
764 | free(set_remove(link->ndisc_dnssl, s)); | |
765 | updated = true; | |
766 | continue; | |
767 | } | |
768 | ||
b0b97766 YW |
769 | dnssl = set_get(link->ndisc_dnssl, s); |
770 | if (dnssl) { | |
50550722 | 771 | dnssl->router = router; |
03ccc4b4 | 772 | dnssl->lifetime_usec = lifetime_usec; |
1e7a0e21 LP |
773 | continue; |
774 | } | |
775 | ||
8aba7b83 YW |
776 | if (set_size(link->ndisc_dnssl) >= NDISC_DNSSL_MAX) { |
777 | if (!logged_about_too_many) | |
778 | log_link_warning(link, "Too many DNSSL records per link. Only first %u records will be used.", NDISC_DNSSL_MAX); | |
779 | logged_about_too_many = true; | |
780 | continue; | |
781 | } | |
782 | ||
50550722 | 783 | s->router = router; |
03ccc4b4 | 784 | s->lifetime_usec = lifetime_usec; |
1e7a0e21 | 785 | |
35e601d4 | 786 | r = set_ensure_consume(&link->ndisc_dnssl, &ndisc_dnssl_hash_ops, TAKE_PTR(s)); |
13e8a49a YW |
787 | if (r < 0) |
788 | return log_oom(); | |
1e7a0e21 | 789 | assert(r > 0); |
9092113d YW |
790 | |
791 | updated = true; | |
1e7a0e21 | 792 | } |
13e8a49a | 793 | |
9092113d YW |
794 | if (updated) |
795 | link_dirty(link); | |
796 | ||
13e8a49a | 797 | return 0; |
1e7a0e21 LP |
798 | } |
799 | ||
e8c9b5b0 | 800 | static int ndisc_router_process_options(Link *link, sd_ndisc_router *rt) { |
fbdda4bb YW |
801 | int r; |
802 | ||
1e7a0e21 | 803 | assert(link); |
55d3fdcf | 804 | assert(link->network); |
1e7a0e21 LP |
805 | assert(rt); |
806 | ||
fbdda4bb | 807 | for (r = sd_ndisc_router_option_rewind(rt); ; r = sd_ndisc_router_option_next(rt)) { |
1e7a0e21 LP |
808 | uint8_t type; |
809 | ||
e8c9b5b0 | 810 | if (r < 0) |
13e8a49a | 811 | return log_link_error_errno(link, r, "Failed to iterate through options: %m"); |
1e7a0e21 | 812 | if (r == 0) /* EOF */ |
13e8a49a | 813 | return 0; |
1e7a0e21 LP |
814 | |
815 | r = sd_ndisc_router_option_get_type(rt, &type); | |
e8c9b5b0 | 816 | if (r < 0) |
13e8a49a | 817 | return log_link_error_errno(link, r, "Failed to get RA option type: %m"); |
1e7a0e21 LP |
818 | |
819 | switch (type) { | |
820 | ||
fbdda4bb YW |
821 | case SD_NDISC_OPTION_PREFIX_INFORMATION: |
822 | r = ndisc_router_process_prefix(link, rt); | |
c995fa02 | 823 | if (r < 0) |
fbdda4bb | 824 | return r; |
1e7a0e21 | 825 | break; |
1e7a0e21 LP |
826 | |
827 | case SD_NDISC_OPTION_ROUTE_INFORMATION: | |
13e8a49a YW |
828 | r = ndisc_router_process_route(link, rt); |
829 | if (r < 0) | |
830 | return r; | |
1e7a0e21 LP |
831 | break; |
832 | ||
833 | case SD_NDISC_OPTION_RDNSS: | |
ad0b2df6 YW |
834 | r = ndisc_router_process_rdnss(link, rt); |
835 | if (r < 0) | |
836 | return r; | |
1e7a0e21 LP |
837 | break; |
838 | ||
839 | case SD_NDISC_OPTION_DNSSL: | |
ad0b2df6 YW |
840 | r = ndisc_router_process_dnssl(link, rt); |
841 | if (r < 0) | |
842 | return r; | |
1e7a0e21 LP |
843 | break; |
844 | } | |
1e7a0e21 LP |
845 | } |
846 | } | |
847 | ||
94e6d37c YW |
848 | static int ndisc_drop_outdated(Link *link, usec_t timestamp_usec) { |
849 | bool updated = false; | |
850 | NDiscDNSSL *dnssl; | |
851 | NDiscRDNSS *rdnss; | |
852 | Address *address; | |
853 | Route *route; | |
854 | int r = 0, k; | |
855 | ||
856 | assert(link); | |
857 | ||
858 | /* If an address or friends is already assigned, but not valid anymore, then refuse to update it, | |
859 | * and let's immediately remove it. | |
860 | * See RFC4862, section 5.5.3.e. But the following logic is deviated from RFC4862 by honoring all | |
861 | * valid lifetimes to improve the reaction of SLAAC to renumbering events. | |
862 | * See draft-ietf-6man-slaac-renum-02, section 4.2. */ | |
863 | ||
864 | SET_FOREACH(route, link->routes) { | |
865 | if (route->source != NETWORK_CONFIG_SOURCE_NDISC) | |
866 | continue; | |
867 | ||
868 | if (route->lifetime_usec >= timestamp_usec) | |
869 | continue; /* the route is still valid */ | |
870 | ||
871 | k = route_remove_and_drop(route); | |
872 | if (k < 0) | |
873 | r = log_link_warning_errno(link, k, "Failed to remove outdated SLAAC route, ignoring: %m"); | |
874 | } | |
875 | ||
876 | SET_FOREACH(address, link->addresses) { | |
877 | if (address->source != NETWORK_CONFIG_SOURCE_NDISC) | |
878 | continue; | |
879 | ||
880 | if (address->lifetime_valid_usec >= timestamp_usec) | |
881 | continue; /* the address is still valid */ | |
882 | ||
883 | k = address_remove_and_drop(address); | |
884 | if (k < 0) | |
885 | r = log_link_warning_errno(link, k, "Failed to remove outdated SLAAC address, ignoring: %m"); | |
886 | } | |
887 | ||
888 | SET_FOREACH(rdnss, link->ndisc_rdnss) { | |
889 | if (rdnss->lifetime_usec >= timestamp_usec) | |
890 | continue; /* the DNS server is still valid */ | |
891 | ||
892 | free(set_remove(link->ndisc_rdnss, rdnss)); | |
893 | updated = true; | |
894 | } | |
895 | ||
896 | SET_FOREACH(dnssl, link->ndisc_dnssl) { | |
897 | if (dnssl->lifetime_usec >= timestamp_usec) | |
898 | continue; /* the DNS domain is still valid */ | |
899 | ||
900 | free(set_remove(link->ndisc_dnssl, dnssl)); | |
901 | updated = true; | |
902 | } | |
903 | ||
904 | if (updated) | |
905 | link_dirty(link); | |
906 | ||
907 | return r; | |
908 | } | |
909 | ||
77302468 YW |
910 | static int ndisc_setup_expire(Link *link); |
911 | ||
912 | static int ndisc_expire_handler(sd_event_source *s, uint64_t usec, void *userdata) { | |
913 | Link *link = ASSERT_PTR(userdata); | |
914 | usec_t now_usec; | |
915 | ||
916 | assert(link->manager); | |
917 | ||
918 | assert_se(sd_event_now(link->manager->event, CLOCK_BOOTTIME, &now_usec) >= 0); | |
919 | ||
920 | (void) ndisc_drop_outdated(link, now_usec); | |
921 | (void) ndisc_setup_expire(link); | |
922 | return 0; | |
923 | } | |
924 | ||
925 | static int ndisc_setup_expire(Link *link) { | |
926 | usec_t lifetime_usec = USEC_INFINITY; | |
927 | NDiscDNSSL *dnssl; | |
928 | NDiscRDNSS *rdnss; | |
929 | Address *address; | |
930 | Route *route; | |
931 | int r; | |
932 | ||
933 | assert(link); | |
934 | assert(link->manager); | |
935 | ||
936 | SET_FOREACH(route, link->routes) { | |
937 | if (route->source != NETWORK_CONFIG_SOURCE_NDISC) | |
938 | continue; | |
939 | ||
940 | if (!route_exists(route)) | |
941 | continue; | |
942 | ||
943 | lifetime_usec = MIN(lifetime_usec, route->lifetime_usec); | |
944 | } | |
945 | ||
946 | SET_FOREACH(address, link->addresses) { | |
947 | if (address->source != NETWORK_CONFIG_SOURCE_NDISC) | |
948 | continue; | |
949 | ||
950 | if (!address_exists(address)) | |
951 | continue; | |
952 | ||
953 | lifetime_usec = MIN(lifetime_usec, address->lifetime_valid_usec); | |
954 | } | |
955 | ||
956 | SET_FOREACH(rdnss, link->ndisc_rdnss) | |
957 | lifetime_usec = MIN(lifetime_usec, rdnss->lifetime_usec); | |
958 | ||
959 | SET_FOREACH(dnssl, link->ndisc_dnssl) | |
960 | lifetime_usec = MIN(lifetime_usec, dnssl->lifetime_usec); | |
961 | ||
962 | if (lifetime_usec == USEC_INFINITY) | |
963 | return 0; | |
964 | ||
965 | r = event_reset_time(link->manager->event, &link->ndisc_expire, CLOCK_BOOTTIME, | |
966 | lifetime_usec, 0, ndisc_expire_handler, link, 0, "ndisc-expiration", true); | |
967 | if (r < 0) | |
968 | return log_link_warning_errno(link, r, "Failed to update expiration timer for ndisc: %m"); | |
969 | ||
970 | return 0; | |
971 | } | |
972 | ||
928112a4 YW |
973 | static int ndisc_start_dhcp6_client(Link *link, sd_ndisc_router *rt) { |
974 | int r; | |
975 | ||
976 | assert(link); | |
977 | assert(link->network); | |
978 | ||
979 | switch (link->network->ipv6_accept_ra_start_dhcp6_client) { | |
980 | case IPV6_ACCEPT_RA_START_DHCP6_CLIENT_NO: | |
981 | return 0; | |
982 | ||
983 | case IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES: { | |
984 | uint64_t flags; | |
985 | ||
986 | r = sd_ndisc_router_get_flags(rt, &flags); | |
987 | if (r < 0) | |
988 | return log_link_warning_errno(link, r, "Failed to get RA flags: %m"); | |
989 | ||
990 | if ((flags & (ND_RA_FLAG_MANAGED | ND_RA_FLAG_OTHER)) == 0) | |
991 | return 0; | |
992 | ||
993 | /* (re)start DHCPv6 client in stateful or stateless mode according to RA flags. | |
0bcc6557 AH |
994 | * Note, if both "managed" and "other configuration" bits are set, then ignore |
995 | * "other configuration" bit. See RFC 4861. */ | |
fac19a21 | 996 | r = dhcp6_start_on_ra(link, !(flags & ND_RA_FLAG_MANAGED)); |
928112a4 YW |
997 | break; |
998 | } | |
999 | case IPV6_ACCEPT_RA_START_DHCP6_CLIENT_ALWAYS: | |
0bcc6557 | 1000 | /* When IPv6AcceptRA.DHCPv6Client=always, start dhcp6 client in solicit mode |
928112a4 | 1001 | * even if the router flags have neither M nor O flags. */ |
fac19a21 | 1002 | r = dhcp6_start_on_ra(link, /* information_request = */ false); |
928112a4 YW |
1003 | break; |
1004 | ||
1005 | default: | |
1006 | assert_not_reached(); | |
1007 | } | |
1008 | ||
1009 | if (r < 0) | |
1010 | return log_link_error_errno(link, r, "Could not acquire DHCPv6 lease on NDisc request: %m"); | |
1011 | ||
1012 | log_link_debug(link, "Acquiring DHCPv6 lease on NDisc request"); | |
1013 | return 0; | |
1014 | } | |
1015 | ||
d5017c84 | 1016 | static int ndisc_router_handler(Link *link, sd_ndisc_router *rt) { |
b8ce3b44 | 1017 | struct in6_addr router; |
94e6d37c | 1018 | usec_t timestamp_usec; |
86e2be7b | 1019 | int r; |
1e7a0e21 LP |
1020 | |
1021 | assert(link); | |
1022 | assert(link->network); | |
1023 | assert(link->manager); | |
1024 | assert(rt); | |
1025 | ||
b8ce3b44 | 1026 | r = sd_ndisc_router_get_address(rt, &router); |
75d26411 YW |
1027 | if (r < 0) |
1028 | return log_link_error_errno(link, r, "Failed to get router address from RA: %m"); | |
1029 | ||
c995fa02 | 1030 | if (in6_prefix_is_filtered(&router, 128, link->network->ndisc_allow_listed_router, link->network->ndisc_deny_listed_router)) { |
75d26411 | 1031 | if (DEBUG_LOGGING) { |
75d26411 | 1032 | if (!set_isempty(link->network->ndisc_allow_listed_router)) |
84dbb3fd | 1033 | log_link_debug(link, "Router %s is not in allow list, ignoring.", IN6_ADDR_TO_STRING(&router)); |
75d26411 | 1034 | else |
84dbb3fd | 1035 | log_link_debug(link, "Router %s is in deny list, ignoring.", IN6_ADDR_TO_STRING(&router)); |
75d26411 YW |
1036 | } |
1037 | return 0; | |
1038 | } | |
1039 | ||
94e6d37c YW |
1040 | r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); |
1041 | if (r < 0) | |
1042 | return r; | |
1043 | ||
1044 | r = ndisc_drop_outdated(link, timestamp_usec); | |
1045 | if (r < 0) | |
1046 | return r; | |
1047 | ||
928112a4 YW |
1048 | r = ndisc_start_dhcp6_client(link, rt); |
1049 | if (r < 0) | |
1050 | return r; | |
1e7a0e21 | 1051 | |
13e8a49a YW |
1052 | r = ndisc_router_process_default(link, rt); |
1053 | if (r < 0) | |
1054 | return r; | |
fbdda4bb | 1055 | |
13e8a49a YW |
1056 | r = ndisc_router_process_options(link, rt); |
1057 | if (r < 0) | |
1058 | return r; | |
d5017c84 | 1059 | |
77302468 YW |
1060 | r = ndisc_setup_expire(link); |
1061 | if (r < 0) | |
1062 | return r; | |
1063 | ||
2ccada8d | 1064 | if (link->ndisc_messages == 0) |
3b6a3bde | 1065 | link->ndisc_configured = true; |
2ccada8d | 1066 | else |
3b6a3bde | 1067 | log_link_debug(link, "Setting SLAAC addresses and router."); |
69203fba | 1068 | |
3b6a3bde | 1069 | if (!link->ndisc_configured) |
69203fba YW |
1070 | link_set_state(link, LINK_STATE_CONFIGURING); |
1071 | ||
76c5a0f2 | 1072 | link_check_ready(link); |
69203fba | 1073 | return 0; |
1e7a0e21 LP |
1074 | } |
1075 | ||
2324fd3a | 1076 | static void ndisc_handler(sd_ndisc *nd, sd_ndisc_event_t event, sd_ndisc_router *rt, void *userdata) { |
99534007 | 1077 | Link *link = ASSERT_PTR(userdata); |
13e8a49a | 1078 | int r; |
a13c50e7 | 1079 | |
9d96e6c3 TG |
1080 | if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) |
1081 | return; | |
a13c50e7 | 1082 | |
9d96e6c3 | 1083 | switch (event) { |
1e7a0e21 LP |
1084 | |
1085 | case SD_NDISC_EVENT_ROUTER: | |
13e8a49a YW |
1086 | r = ndisc_router_handler(link, rt); |
1087 | if (r < 0) { | |
1088 | link_enter_failed(link); | |
1089 | return; | |
1090 | } | |
1e7a0e21 LP |
1091 | break; |
1092 | ||
9d96e6c3 | 1093 | case SD_NDISC_EVENT_TIMEOUT: |
a8c10331 | 1094 | log_link_debug(link, "NDisc handler get timeout event"); |
3b6a3bde YW |
1095 | if (link->ndisc_messages == 0) { |
1096 | link->ndisc_configured = true; | |
3336e946 YW |
1097 | link_check_ready(link); |
1098 | } | |
9d96e6c3 TG |
1099 | break; |
1100 | default: | |
04499a70 | 1101 | assert_not_reached(); |
a13c50e7 TG |
1102 | } |
1103 | } | |
1104 | ||
ba4c7184 | 1105 | static int ndisc_configure(Link *link) { |
a13c50e7 TG |
1106 | int r; |
1107 | ||
1e7a0e21 LP |
1108 | assert(link); |
1109 | ||
2ffd6d73 YW |
1110 | if (!link_ipv6_accept_ra_enabled(link)) |
1111 | return 0; | |
a13c50e7 | 1112 | |
5c078687 | 1113 | if (link->ndisc) |
bc9e40c9 | 1114 | return -EBUSY; /* Already configured. */ |
2ffd6d73 | 1115 | |
5c078687 YW |
1116 | r = sd_ndisc_new(&link->ndisc); |
1117 | if (r < 0) | |
1118 | return r; | |
1119 | ||
1120 | r = sd_ndisc_attach_event(link->ndisc, link->manager->event, 0); | |
1121 | if (r < 0) | |
1122 | return r; | |
a13c50e7 | 1123 | |
3be64aa4 YW |
1124 | if (link->hw_addr.length == ETH_ALEN) { |
1125 | r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether); | |
1126 | if (r < 0) | |
1127 | return r; | |
1128 | } | |
a13c50e7 | 1129 | |
1e7a0e21 | 1130 | r = sd_ndisc_set_ifindex(link->ndisc, link->ifindex); |
a13c50e7 TG |
1131 | if (r < 0) |
1132 | return r; | |
1133 | ||
1e7a0e21 | 1134 | r = sd_ndisc_set_callback(link->ndisc, ndisc_handler, link); |
a13c50e7 TG |
1135 | if (r < 0) |
1136 | return r; | |
1137 | ||
1e7a0e21 LP |
1138 | return 0; |
1139 | } | |
1140 | ||
294f129b | 1141 | int ndisc_start(Link *link) { |
ba4c7184 YW |
1142 | int r; |
1143 | ||
294f129b YW |
1144 | assert(link); |
1145 | ||
1146 | if (!link->ndisc || !link->dhcp6_client) | |
1147 | return 0; | |
1148 | ||
ccffa166 YW |
1149 | if (!link_has_carrier(link)) |
1150 | return 0; | |
1151 | ||
3b6a3bde YW |
1152 | if (in6_addr_is_null(&link->ipv6ll_address)) |
1153 | return 0; | |
1154 | ||
294f129b YW |
1155 | log_link_debug(link, "Discovering IPv6 routers"); |
1156 | ||
ba4c7184 YW |
1157 | r = sd_ndisc_start(link->ndisc); |
1158 | if (r < 0) | |
1159 | return r; | |
1160 | ||
1161 | return 1; | |
1162 | } | |
1163 | ||
09d09207 | 1164 | static int ndisc_process_request(Request *req, Link *link, void *userdata) { |
ba4c7184 YW |
1165 | int r; |
1166 | ||
ff51134c | 1167 | assert(link); |
ba4c7184 | 1168 | |
4b482e8b | 1169 | if (!link_is_ready_to_configure(link, /* allow_unmanaged = */ false)) |
ba4c7184 YW |
1170 | return 0; |
1171 | ||
ba4c7184 YW |
1172 | r = ndisc_configure(link); |
1173 | if (r < 0) | |
1174 | return log_link_warning_errno(link, r, "Failed to configure IPv6 Router Discovery: %m"); | |
1175 | ||
1176 | r = ndisc_start(link); | |
1177 | if (r < 0) | |
1178 | return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m"); | |
1179 | ||
1180 | log_link_debug(link, "IPv6 Router Discovery is configured%s.", | |
1181 | r > 0 ? " and started" : ""); | |
ba4c7184 YW |
1182 | return 1; |
1183 | } | |
1184 | ||
1185 | int link_request_ndisc(Link *link) { | |
1186 | int r; | |
1187 | ||
1188 | assert(link); | |
1189 | ||
1190 | if (!link_ipv6_accept_ra_enabled(link)) | |
1191 | return 0; | |
1192 | ||
1193 | if (link->ndisc) | |
1194 | return 0; | |
1195 | ||
09d09207 | 1196 | r = link_queue_request(link, REQUEST_TYPE_NDISC, ndisc_process_request, NULL); |
ba4c7184 YW |
1197 | if (r < 0) |
1198 | return log_link_warning_errno(link, r, "Failed to request configuring of the IPv6 Router Discovery: %m"); | |
1199 | ||
1200 | log_link_debug(link, "Requested configuring of the IPv6 Router Discovery."); | |
1201 | return 0; | |
294f129b YW |
1202 | } |
1203 | ||
77302468 YW |
1204 | int ndisc_stop(Link *link) { |
1205 | assert(link); | |
1206 | ||
1207 | link->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire); | |
1208 | ||
1209 | return sd_ndisc_stop(link->ndisc); | |
1210 | } | |
1211 | ||
1212 | ||
c69305ff LP |
1213 | void ndisc_flush(Link *link) { |
1214 | assert(link); | |
1215 | ||
1216 | /* Removes all RDNSS and DNSSL entries, without exception */ | |
1217 | ||
b0b97766 YW |
1218 | link->ndisc_rdnss = set_free(link->ndisc_rdnss); |
1219 | link->ndisc_dnssl = set_free(link->ndisc_dnssl); | |
c69305ff | 1220 | } |
e520ce64 | 1221 | |
ac24e418 SS |
1222 | static const char* const ipv6_accept_ra_start_dhcp6_client_table[_IPV6_ACCEPT_RA_START_DHCP6_CLIENT_MAX] = { |
1223 | [IPV6_ACCEPT_RA_START_DHCP6_CLIENT_NO] = "no", | |
1224 | [IPV6_ACCEPT_RA_START_DHCP6_CLIENT_ALWAYS] = "always", | |
1225 | [IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES] = "yes", | |
1226 | }; | |
1227 | ||
3b6a3bde YW |
1228 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING_WITH_BOOLEAN(ipv6_accept_ra_start_dhcp6_client, IPv6AcceptRAStartDHCP6Client, IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES); |
1229 | ||
1230 | DEFINE_CONFIG_PARSE_ENUM(config_parse_ipv6_accept_ra_use_domains, dhcp_use_domains, DHCPUseDomains, | |
1231 | "Failed to parse UseDomains= setting"); | |
1232 | DEFINE_CONFIG_PARSE_ENUM(config_parse_ipv6_accept_ra_start_dhcp6_client, ipv6_accept_ra_start_dhcp6_client, IPv6AcceptRAStartDHCP6Client, | |
1233 | "Failed to parse DHCPv6Client= setting"); |