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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 | ||
64de00c4 YW |
800 | static NDiscCaptivePortal* ndisc_captive_portal_free(NDiscCaptivePortal *x) { |
801 | if (!x) | |
802 | return NULL; | |
803 | ||
804 | free(x->captive_portal); | |
805 | return mfree(x); | |
806 | } | |
807 | ||
808 | DEFINE_TRIVIAL_CLEANUP_FUNC(NDiscCaptivePortal*, ndisc_captive_portal_free); | |
809 | ||
810 | static void ndisc_captive_portal_hash_func(const NDiscCaptivePortal *x, struct siphash *state) { | |
811 | assert(x); | |
812 | siphash24_compress_string(x->captive_portal, state); | |
813 | } | |
814 | ||
815 | static int ndisc_captive_portal_compare_func(const NDiscCaptivePortal *a, const NDiscCaptivePortal *b) { | |
816 | assert(a); | |
817 | assert(b); | |
818 | return strcmp_ptr(a->captive_portal, b->captive_portal); | |
819 | } | |
820 | ||
821 | DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR( | |
822 | ndisc_captive_portal_hash_ops, | |
823 | NDiscCaptivePortal, | |
824 | ndisc_captive_portal_hash_func, | |
825 | ndisc_captive_portal_compare_func, | |
826 | free); | |
827 | ||
828 | static int ndisc_router_process_captive_portal(Link *link, sd_ndisc_router *rt) { | |
829 | _cleanup_(ndisc_captive_portal_freep) NDiscCaptivePortal *new_entry = NULL; | |
830 | _cleanup_free_ char *captive_portal = NULL; | |
831 | usec_t lifetime_usec, timestamp_usec; | |
832 | NDiscCaptivePortal *exist; | |
833 | struct in6_addr router; | |
834 | uint16_t lifetime_sec; | |
835 | const char *uri; | |
836 | size_t len; | |
837 | int r; | |
838 | ||
839 | assert(link); | |
840 | assert(link->network); | |
841 | assert(rt); | |
842 | ||
843 | if (!link->network->ipv6_accept_ra_use_captive_portal) | |
844 | return 0; | |
845 | ||
846 | r = sd_ndisc_router_get_address(rt, &router); | |
847 | if (r < 0) | |
848 | return log_link_warning_errno(link, r, "Failed to get router address from RA: %m"); | |
849 | ||
850 | r = sd_ndisc_router_get_lifetime(rt, &lifetime_sec); | |
851 | if (r < 0) | |
852 | return log_link_warning_errno(link, r, "Failed to get lifetime of RA message: %m"); | |
853 | ||
854 | r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); | |
855 | if (r < 0) | |
856 | return log_link_warning_errno(link, r, "Failed to get RA timestamp: %m"); | |
857 | ||
858 | lifetime_usec = sec16_to_usec(lifetime_sec, timestamp_usec); | |
859 | ||
860 | r = sd_ndisc_router_captive_portal_get_uri(rt, &uri, &len); | |
861 | if (r < 0) | |
862 | return log_link_warning_errno(link, r, "Failed to get captive portal from RA: %m"); | |
863 | ||
864 | if (len == 0) | |
865 | return 0; | |
866 | ||
867 | r = make_cstring(uri, len, MAKE_CSTRING_REFUSE_TRAILING_NUL, &captive_portal); | |
868 | if (r < 0) | |
869 | return log_link_warning_errno(link, r, "Failed to convert captive portal URI: %m"); | |
870 | ||
871 | if (!in_charset(captive_portal, URI_VALID)) | |
872 | return log_link_debug_errno(link, SYNTHETIC_ERRNO(EBADMSG), "Received invalid captive portal, ignoring."); | |
873 | ||
874 | exist = set_get(link->ndisc_captive_portals, &(NDiscCaptivePortal) { .captive_portal = captive_portal }); | |
875 | if (exist) { | |
876 | /* update existing entry */ | |
877 | exist->router = router; | |
878 | exist->lifetime_usec = lifetime_usec; | |
879 | return 0; | |
880 | } | |
881 | ||
882 | new_entry = new(NDiscCaptivePortal, 1); | |
883 | if (!new_entry) | |
884 | return log_oom(); | |
885 | ||
886 | *new_entry = (NDiscCaptivePortal) { | |
887 | .router = router, | |
888 | .lifetime_usec = lifetime_usec, | |
889 | .captive_portal = TAKE_PTR(captive_portal), | |
890 | }; | |
891 | ||
892 | r = set_ensure_put(&link->ndisc_captive_portals, &ndisc_captive_portal_hash_ops, new_entry); | |
893 | if (r < 0) | |
894 | return log_oom(); | |
895 | assert(r > 0); | |
896 | TAKE_PTR(new_entry); | |
897 | ||
898 | link_dirty(link); | |
899 | return 0; | |
900 | } | |
901 | ||
e8c9b5b0 | 902 | static int ndisc_router_process_options(Link *link, sd_ndisc_router *rt) { |
fbdda4bb YW |
903 | int r; |
904 | ||
1e7a0e21 | 905 | assert(link); |
55d3fdcf | 906 | assert(link->network); |
1e7a0e21 LP |
907 | assert(rt); |
908 | ||
fbdda4bb | 909 | for (r = sd_ndisc_router_option_rewind(rt); ; r = sd_ndisc_router_option_next(rt)) { |
1e7a0e21 LP |
910 | uint8_t type; |
911 | ||
e8c9b5b0 | 912 | if (r < 0) |
13e8a49a | 913 | return log_link_error_errno(link, r, "Failed to iterate through options: %m"); |
1e7a0e21 | 914 | if (r == 0) /* EOF */ |
13e8a49a | 915 | return 0; |
1e7a0e21 LP |
916 | |
917 | r = sd_ndisc_router_option_get_type(rt, &type); | |
e8c9b5b0 | 918 | if (r < 0) |
13e8a49a | 919 | return log_link_error_errno(link, r, "Failed to get RA option type: %m"); |
1e7a0e21 LP |
920 | |
921 | switch (type) { | |
fbdda4bb YW |
922 | case SD_NDISC_OPTION_PREFIX_INFORMATION: |
923 | r = ndisc_router_process_prefix(link, rt); | |
1e7a0e21 | 924 | break; |
1e7a0e21 LP |
925 | |
926 | case SD_NDISC_OPTION_ROUTE_INFORMATION: | |
13e8a49a | 927 | r = ndisc_router_process_route(link, rt); |
1e7a0e21 LP |
928 | break; |
929 | ||
930 | case SD_NDISC_OPTION_RDNSS: | |
ad0b2df6 | 931 | r = ndisc_router_process_rdnss(link, rt); |
1e7a0e21 LP |
932 | break; |
933 | ||
934 | case SD_NDISC_OPTION_DNSSL: | |
ad0b2df6 | 935 | r = ndisc_router_process_dnssl(link, rt); |
1e7a0e21 | 936 | break; |
9747955d RP |
937 | case SD_NDISC_OPTION_CAPTIVE_PORTAL: |
938 | r = ndisc_router_process_captive_portal(link, rt); | |
939 | break; | |
1e7a0e21 | 940 | } |
5908d864 YW |
941 | if (r < 0 && r != -EBADMSG) |
942 | return r; | |
1e7a0e21 LP |
943 | } |
944 | } | |
945 | ||
94e6d37c YW |
946 | static int ndisc_drop_outdated(Link *link, usec_t timestamp_usec) { |
947 | bool updated = false; | |
948 | NDiscDNSSL *dnssl; | |
949 | NDiscRDNSS *rdnss; | |
64de00c4 | 950 | NDiscCaptivePortal *cp; |
94e6d37c YW |
951 | Address *address; |
952 | Route *route; | |
953 | int r = 0, k; | |
954 | ||
955 | assert(link); | |
956 | ||
957 | /* If an address or friends is already assigned, but not valid anymore, then refuse to update it, | |
958 | * and let's immediately remove it. | |
959 | * See RFC4862, section 5.5.3.e. But the following logic is deviated from RFC4862 by honoring all | |
960 | * valid lifetimes to improve the reaction of SLAAC to renumbering events. | |
961 | * See draft-ietf-6man-slaac-renum-02, section 4.2. */ | |
962 | ||
963 | SET_FOREACH(route, link->routes) { | |
964 | if (route->source != NETWORK_CONFIG_SOURCE_NDISC) | |
965 | continue; | |
966 | ||
967 | if (route->lifetime_usec >= timestamp_usec) | |
968 | continue; /* the route is still valid */ | |
969 | ||
970 | k = route_remove_and_drop(route); | |
971 | if (k < 0) | |
972 | r = log_link_warning_errno(link, k, "Failed to remove outdated SLAAC route, ignoring: %m"); | |
973 | } | |
974 | ||
975 | SET_FOREACH(address, link->addresses) { | |
976 | if (address->source != NETWORK_CONFIG_SOURCE_NDISC) | |
977 | continue; | |
978 | ||
979 | if (address->lifetime_valid_usec >= timestamp_usec) | |
980 | continue; /* the address is still valid */ | |
981 | ||
982 | k = address_remove_and_drop(address); | |
983 | if (k < 0) | |
984 | r = log_link_warning_errno(link, k, "Failed to remove outdated SLAAC address, ignoring: %m"); | |
985 | } | |
986 | ||
987 | SET_FOREACH(rdnss, link->ndisc_rdnss) { | |
988 | if (rdnss->lifetime_usec >= timestamp_usec) | |
989 | continue; /* the DNS server is still valid */ | |
990 | ||
991 | free(set_remove(link->ndisc_rdnss, rdnss)); | |
992 | updated = true; | |
993 | } | |
994 | ||
995 | SET_FOREACH(dnssl, link->ndisc_dnssl) { | |
996 | if (dnssl->lifetime_usec >= timestamp_usec) | |
997 | continue; /* the DNS domain is still valid */ | |
998 | ||
999 | free(set_remove(link->ndisc_dnssl, dnssl)); | |
1000 | updated = true; | |
1001 | } | |
1002 | ||
64de00c4 YW |
1003 | SET_FOREACH(cp, link->ndisc_captive_portals) { |
1004 | if (cp->lifetime_usec >= timestamp_usec) | |
1005 | continue; /* the captive portal is still valid */ | |
1006 | ||
1007 | free(set_remove(link->ndisc_captive_portals, cp)); | |
1008 | updated = true; | |
1009 | } | |
1010 | ||
94e6d37c YW |
1011 | if (updated) |
1012 | link_dirty(link); | |
1013 | ||
1014 | return r; | |
1015 | } | |
1016 | ||
77302468 YW |
1017 | static int ndisc_setup_expire(Link *link); |
1018 | ||
1019 | static int ndisc_expire_handler(sd_event_source *s, uint64_t usec, void *userdata) { | |
1020 | Link *link = ASSERT_PTR(userdata); | |
1021 | usec_t now_usec; | |
1022 | ||
1023 | assert(link->manager); | |
1024 | ||
1025 | assert_se(sd_event_now(link->manager->event, CLOCK_BOOTTIME, &now_usec) >= 0); | |
1026 | ||
1027 | (void) ndisc_drop_outdated(link, now_usec); | |
1028 | (void) ndisc_setup_expire(link); | |
1029 | return 0; | |
1030 | } | |
1031 | ||
1032 | static int ndisc_setup_expire(Link *link) { | |
1033 | usec_t lifetime_usec = USEC_INFINITY; | |
64de00c4 | 1034 | NDiscCaptivePortal *cp; |
77302468 YW |
1035 | NDiscDNSSL *dnssl; |
1036 | NDiscRDNSS *rdnss; | |
1037 | Address *address; | |
1038 | Route *route; | |
1039 | int r; | |
1040 | ||
1041 | assert(link); | |
1042 | assert(link->manager); | |
1043 | ||
1044 | SET_FOREACH(route, link->routes) { | |
1045 | if (route->source != NETWORK_CONFIG_SOURCE_NDISC) | |
1046 | continue; | |
1047 | ||
1048 | if (!route_exists(route)) | |
1049 | continue; | |
1050 | ||
1051 | lifetime_usec = MIN(lifetime_usec, route->lifetime_usec); | |
1052 | } | |
1053 | ||
1054 | SET_FOREACH(address, link->addresses) { | |
1055 | if (address->source != NETWORK_CONFIG_SOURCE_NDISC) | |
1056 | continue; | |
1057 | ||
1058 | if (!address_exists(address)) | |
1059 | continue; | |
1060 | ||
1061 | lifetime_usec = MIN(lifetime_usec, address->lifetime_valid_usec); | |
1062 | } | |
1063 | ||
1064 | SET_FOREACH(rdnss, link->ndisc_rdnss) | |
1065 | lifetime_usec = MIN(lifetime_usec, rdnss->lifetime_usec); | |
1066 | ||
1067 | SET_FOREACH(dnssl, link->ndisc_dnssl) | |
1068 | lifetime_usec = MIN(lifetime_usec, dnssl->lifetime_usec); | |
1069 | ||
64de00c4 YW |
1070 | SET_FOREACH(cp, link->ndisc_captive_portals) |
1071 | lifetime_usec = MIN(lifetime_usec, cp->lifetime_usec); | |
1072 | ||
77302468 YW |
1073 | if (lifetime_usec == USEC_INFINITY) |
1074 | return 0; | |
1075 | ||
1076 | r = event_reset_time(link->manager->event, &link->ndisc_expire, CLOCK_BOOTTIME, | |
1077 | lifetime_usec, 0, ndisc_expire_handler, link, 0, "ndisc-expiration", true); | |
1078 | if (r < 0) | |
1079 | return log_link_warning_errno(link, r, "Failed to update expiration timer for ndisc: %m"); | |
1080 | ||
1081 | return 0; | |
1082 | } | |
1083 | ||
928112a4 YW |
1084 | static int ndisc_start_dhcp6_client(Link *link, sd_ndisc_router *rt) { |
1085 | int r; | |
1086 | ||
1087 | assert(link); | |
1088 | assert(link->network); | |
1089 | ||
1090 | switch (link->network->ipv6_accept_ra_start_dhcp6_client) { | |
1091 | case IPV6_ACCEPT_RA_START_DHCP6_CLIENT_NO: | |
1092 | return 0; | |
1093 | ||
1094 | case IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES: { | |
1095 | uint64_t flags; | |
1096 | ||
1097 | r = sd_ndisc_router_get_flags(rt, &flags); | |
1098 | if (r < 0) | |
1099 | return log_link_warning_errno(link, r, "Failed to get RA flags: %m"); | |
1100 | ||
1101 | if ((flags & (ND_RA_FLAG_MANAGED | ND_RA_FLAG_OTHER)) == 0) | |
1102 | return 0; | |
1103 | ||
1104 | /* (re)start DHCPv6 client in stateful or stateless mode according to RA flags. | |
0bcc6557 AH |
1105 | * Note, if both "managed" and "other configuration" bits are set, then ignore |
1106 | * "other configuration" bit. See RFC 4861. */ | |
fac19a21 | 1107 | r = dhcp6_start_on_ra(link, !(flags & ND_RA_FLAG_MANAGED)); |
928112a4 YW |
1108 | break; |
1109 | } | |
1110 | case IPV6_ACCEPT_RA_START_DHCP6_CLIENT_ALWAYS: | |
0bcc6557 | 1111 | /* When IPv6AcceptRA.DHCPv6Client=always, start dhcp6 client in solicit mode |
928112a4 | 1112 | * even if the router flags have neither M nor O flags. */ |
fac19a21 | 1113 | r = dhcp6_start_on_ra(link, /* information_request = */ false); |
928112a4 YW |
1114 | break; |
1115 | ||
1116 | default: | |
1117 | assert_not_reached(); | |
1118 | } | |
1119 | ||
1120 | if (r < 0) | |
1121 | return log_link_error_errno(link, r, "Could not acquire DHCPv6 lease on NDisc request: %m"); | |
1122 | ||
1123 | log_link_debug(link, "Acquiring DHCPv6 lease on NDisc request"); | |
1124 | return 0; | |
1125 | } | |
1126 | ||
d5017c84 | 1127 | static int ndisc_router_handler(Link *link, sd_ndisc_router *rt) { |
b8ce3b44 | 1128 | struct in6_addr router; |
94e6d37c | 1129 | usec_t timestamp_usec; |
86e2be7b | 1130 | int r; |
1e7a0e21 LP |
1131 | |
1132 | assert(link); | |
1133 | assert(link->network); | |
1134 | assert(link->manager); | |
1135 | assert(rt); | |
1136 | ||
b8ce3b44 | 1137 | r = sd_ndisc_router_get_address(rt, &router); |
5908d864 YW |
1138 | if (r == -ENODATA) { |
1139 | log_link_debug(link, "Received RA without router address, ignoring."); | |
1140 | return 0; | |
1141 | } | |
75d26411 YW |
1142 | if (r < 0) |
1143 | return log_link_error_errno(link, r, "Failed to get router address from RA: %m"); | |
1144 | ||
c995fa02 | 1145 | if (in6_prefix_is_filtered(&router, 128, link->network->ndisc_allow_listed_router, link->network->ndisc_deny_listed_router)) { |
75d26411 | 1146 | if (DEBUG_LOGGING) { |
75d26411 | 1147 | if (!set_isempty(link->network->ndisc_allow_listed_router)) |
84dbb3fd | 1148 | log_link_debug(link, "Router %s is not in allow list, ignoring.", IN6_ADDR_TO_STRING(&router)); |
75d26411 | 1149 | else |
84dbb3fd | 1150 | log_link_debug(link, "Router %s is in deny list, ignoring.", IN6_ADDR_TO_STRING(&router)); |
75d26411 YW |
1151 | } |
1152 | return 0; | |
1153 | } | |
1154 | ||
94e6d37c | 1155 | r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); |
5908d864 YW |
1156 | if (r == -ENODATA) { |
1157 | log_link_debug(link, "Received RA without timestamp, ignoring."); | |
1158 | return 0; | |
1159 | } | |
94e6d37c YW |
1160 | if (r < 0) |
1161 | return r; | |
1162 | ||
1163 | r = ndisc_drop_outdated(link, timestamp_usec); | |
1164 | if (r < 0) | |
1165 | return r; | |
1166 | ||
928112a4 YW |
1167 | r = ndisc_start_dhcp6_client(link, rt); |
1168 | if (r < 0) | |
1169 | return r; | |
1e7a0e21 | 1170 | |
13e8a49a YW |
1171 | r = ndisc_router_process_default(link, rt); |
1172 | if (r < 0) | |
1173 | return r; | |
fbdda4bb | 1174 | |
13e8a49a YW |
1175 | r = ndisc_router_process_options(link, rt); |
1176 | if (r < 0) | |
1177 | return r; | |
d5017c84 | 1178 | |
77302468 YW |
1179 | r = ndisc_setup_expire(link); |
1180 | if (r < 0) | |
1181 | return r; | |
1182 | ||
2ccada8d | 1183 | if (link->ndisc_messages == 0) |
3b6a3bde | 1184 | link->ndisc_configured = true; |
2ccada8d | 1185 | else |
3b6a3bde | 1186 | log_link_debug(link, "Setting SLAAC addresses and router."); |
69203fba | 1187 | |
3b6a3bde | 1188 | if (!link->ndisc_configured) |
69203fba YW |
1189 | link_set_state(link, LINK_STATE_CONFIGURING); |
1190 | ||
76c5a0f2 | 1191 | link_check_ready(link); |
69203fba | 1192 | return 0; |
1e7a0e21 LP |
1193 | } |
1194 | ||
2324fd3a | 1195 | static void ndisc_handler(sd_ndisc *nd, sd_ndisc_event_t event, sd_ndisc_router *rt, void *userdata) { |
99534007 | 1196 | Link *link = ASSERT_PTR(userdata); |
13e8a49a | 1197 | int r; |
a13c50e7 | 1198 | |
9d96e6c3 TG |
1199 | if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) |
1200 | return; | |
a13c50e7 | 1201 | |
9d96e6c3 | 1202 | switch (event) { |
1e7a0e21 LP |
1203 | |
1204 | case SD_NDISC_EVENT_ROUTER: | |
13e8a49a | 1205 | r = ndisc_router_handler(link, rt); |
5908d864 | 1206 | if (r < 0 && r != -EBADMSG) { |
13e8a49a YW |
1207 | link_enter_failed(link); |
1208 | return; | |
1209 | } | |
1e7a0e21 LP |
1210 | break; |
1211 | ||
9d96e6c3 | 1212 | case SD_NDISC_EVENT_TIMEOUT: |
a8c10331 | 1213 | log_link_debug(link, "NDisc handler get timeout event"); |
3b6a3bde YW |
1214 | if (link->ndisc_messages == 0) { |
1215 | link->ndisc_configured = true; | |
3336e946 YW |
1216 | link_check_ready(link); |
1217 | } | |
9d96e6c3 TG |
1218 | break; |
1219 | default: | |
04499a70 | 1220 | assert_not_reached(); |
a13c50e7 TG |
1221 | } |
1222 | } | |
1223 | ||
ba4c7184 | 1224 | static int ndisc_configure(Link *link) { |
a13c50e7 TG |
1225 | int r; |
1226 | ||
1e7a0e21 LP |
1227 | assert(link); |
1228 | ||
2ffd6d73 YW |
1229 | if (!link_ipv6_accept_ra_enabled(link)) |
1230 | return 0; | |
a13c50e7 | 1231 | |
5c078687 | 1232 | if (link->ndisc) |
bc9e40c9 | 1233 | return -EBUSY; /* Already configured. */ |
2ffd6d73 | 1234 | |
5c078687 YW |
1235 | r = sd_ndisc_new(&link->ndisc); |
1236 | if (r < 0) | |
1237 | return r; | |
1238 | ||
1239 | r = sd_ndisc_attach_event(link->ndisc, link->manager->event, 0); | |
1240 | if (r < 0) | |
1241 | return r; | |
a13c50e7 | 1242 | |
3be64aa4 YW |
1243 | if (link->hw_addr.length == ETH_ALEN) { |
1244 | r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether); | |
1245 | if (r < 0) | |
1246 | return r; | |
1247 | } | |
a13c50e7 | 1248 | |
1e7a0e21 | 1249 | r = sd_ndisc_set_ifindex(link->ndisc, link->ifindex); |
a13c50e7 TG |
1250 | if (r < 0) |
1251 | return r; | |
1252 | ||
1e7a0e21 | 1253 | r = sd_ndisc_set_callback(link->ndisc, ndisc_handler, link); |
a13c50e7 TG |
1254 | if (r < 0) |
1255 | return r; | |
1256 | ||
1e7a0e21 LP |
1257 | return 0; |
1258 | } | |
1259 | ||
294f129b | 1260 | int ndisc_start(Link *link) { |
ba4c7184 YW |
1261 | int r; |
1262 | ||
294f129b YW |
1263 | assert(link); |
1264 | ||
1265 | if (!link->ndisc || !link->dhcp6_client) | |
1266 | return 0; | |
1267 | ||
ccffa166 YW |
1268 | if (!link_has_carrier(link)) |
1269 | return 0; | |
1270 | ||
3b6a3bde YW |
1271 | if (in6_addr_is_null(&link->ipv6ll_address)) |
1272 | return 0; | |
1273 | ||
294f129b YW |
1274 | log_link_debug(link, "Discovering IPv6 routers"); |
1275 | ||
ba4c7184 YW |
1276 | r = sd_ndisc_start(link->ndisc); |
1277 | if (r < 0) | |
1278 | return r; | |
1279 | ||
1280 | return 1; | |
1281 | } | |
1282 | ||
09d09207 | 1283 | static int ndisc_process_request(Request *req, Link *link, void *userdata) { |
ba4c7184 YW |
1284 | int r; |
1285 | ||
ff51134c | 1286 | assert(link); |
ba4c7184 | 1287 | |
4b482e8b | 1288 | if (!link_is_ready_to_configure(link, /* allow_unmanaged = */ false)) |
ba4c7184 YW |
1289 | return 0; |
1290 | ||
ba4c7184 YW |
1291 | r = ndisc_configure(link); |
1292 | if (r < 0) | |
1293 | return log_link_warning_errno(link, r, "Failed to configure IPv6 Router Discovery: %m"); | |
1294 | ||
1295 | r = ndisc_start(link); | |
1296 | if (r < 0) | |
1297 | return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m"); | |
1298 | ||
1299 | log_link_debug(link, "IPv6 Router Discovery is configured%s.", | |
1300 | r > 0 ? " and started" : ""); | |
ba4c7184 YW |
1301 | return 1; |
1302 | } | |
1303 | ||
1304 | int link_request_ndisc(Link *link) { | |
1305 | int r; | |
1306 | ||
1307 | assert(link); | |
1308 | ||
1309 | if (!link_ipv6_accept_ra_enabled(link)) | |
1310 | return 0; | |
1311 | ||
1312 | if (link->ndisc) | |
1313 | return 0; | |
1314 | ||
09d09207 | 1315 | r = link_queue_request(link, REQUEST_TYPE_NDISC, ndisc_process_request, NULL); |
ba4c7184 YW |
1316 | if (r < 0) |
1317 | return log_link_warning_errno(link, r, "Failed to request configuring of the IPv6 Router Discovery: %m"); | |
1318 | ||
1319 | log_link_debug(link, "Requested configuring of the IPv6 Router Discovery."); | |
1320 | return 0; | |
294f129b YW |
1321 | } |
1322 | ||
77302468 YW |
1323 | int ndisc_stop(Link *link) { |
1324 | assert(link); | |
1325 | ||
1326 | link->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire); | |
1327 | ||
1328 | return sd_ndisc_stop(link->ndisc); | |
1329 | } | |
1330 | ||
1331 | ||
c69305ff LP |
1332 | void ndisc_flush(Link *link) { |
1333 | assert(link); | |
1334 | ||
64de00c4 | 1335 | /* Remove all RDNSS, DNSSL, and Captive Portal entries, without exception. */ |
c69305ff | 1336 | |
b0b97766 YW |
1337 | link->ndisc_rdnss = set_free(link->ndisc_rdnss); |
1338 | link->ndisc_dnssl = set_free(link->ndisc_dnssl); | |
64de00c4 | 1339 | link->ndisc_captive_portals = set_free(link->ndisc_captive_portals); |
c69305ff | 1340 | } |
e520ce64 | 1341 | |
ac24e418 SS |
1342 | static const char* const ipv6_accept_ra_start_dhcp6_client_table[_IPV6_ACCEPT_RA_START_DHCP6_CLIENT_MAX] = { |
1343 | [IPV6_ACCEPT_RA_START_DHCP6_CLIENT_NO] = "no", | |
1344 | [IPV6_ACCEPT_RA_START_DHCP6_CLIENT_ALWAYS] = "always", | |
1345 | [IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES] = "yes", | |
1346 | }; | |
1347 | ||
3b6a3bde YW |
1348 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING_WITH_BOOLEAN(ipv6_accept_ra_start_dhcp6_client, IPv6AcceptRAStartDHCP6Client, IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES); |
1349 | ||
1350 | DEFINE_CONFIG_PARSE_ENUM(config_parse_ipv6_accept_ra_use_domains, dhcp_use_domains, DHCPUseDomains, | |
1351 | "Failed to parse UseDomains= setting"); | |
1352 | DEFINE_CONFIG_PARSE_ENUM(config_parse_ipv6_accept_ra_start_dhcp6_client, ipv6_accept_ra_start_dhcp6_client, IPv6AcceptRAStartDHCP6Client, | |
1353 | "Failed to parse DHCPv6Client= setting"); |