1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
3 Copyright © 2014 Intel Corporation. All rights reserved.
7 #include <netinet/icmp6.h>
9 #include <linux/if_arp.h>
13 #include "missing_network.h"
14 #include "networkd-address-generation.h"
15 #include "networkd-address.h"
16 #include "networkd-dhcp6.h"
17 #include "networkd-manager.h"
18 #include "networkd-ndisc.h"
19 #include "networkd-queue.h"
20 #include "networkd-route.h"
21 #include "networkd-state-file.h"
22 #include "string-table.h"
23 #include "string-util.h"
26 #define NDISC_DNSSL_MAX 64U
27 #define NDISC_RDNSS_MAX 64U
29 bool link_ipv6_accept_ra_enabled(Link
*link
) {
32 if (!socket_ipv6_is_supported())
35 if (link
->flags
& IFF_LOOPBACK
)
38 if (link
->iftype
== ARPHRD_CAN
)
41 if (link
->hw_addr
.length
!= ETH_ALEN
&& !streq_ptr(link
->kind
, "wwan"))
42 /* Currently, only interfaces whose MAC address length is ETH_ALEN are supported.
43 * Note, wwan interfaces may be assigned MAC address slightly later.
44 * Hence, let's wait for a while.*/
50 if (!link_may_have_ipv6ll(link
))
53 assert(link
->network
->ipv6_accept_ra
>= 0);
54 return link
->network
->ipv6_accept_ra
;
57 void network_adjust_ipv6_accept_ra(Network
*network
) {
60 if (!FLAGS_SET(network
->link_local
, ADDRESS_FAMILY_IPV6
)) {
61 if (network
->ipv6_accept_ra
> 0)
62 log_warning("%s: IPv6AcceptRA= is enabled but IPv6 link local addressing is disabled or not supported. "
63 "Disabling IPv6AcceptRA=.", network
->filename
);
64 network
->ipv6_accept_ra
= false;
67 if (network
->ipv6_accept_ra
< 0)
68 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
69 network
->ipv6_accept_ra
= !FLAGS_SET(network
->ip_forward
, ADDRESS_FAMILY_IPV6
);
71 /* When RouterAllowList=, PrefixAllowList= or RouteAllowList= are specified, then
72 * RouterDenyList=, PrefixDenyList= or RouteDenyList= are ignored, respectively. */
73 if (!set_isempty(network
->ndisc_allow_listed_router
))
74 network
->ndisc_deny_listed_router
= set_free_free(network
->ndisc_deny_listed_router
);
75 if (!set_isempty(network
->ndisc_allow_listed_prefix
))
76 network
->ndisc_deny_listed_prefix
= set_free_free(network
->ndisc_deny_listed_prefix
);
77 if (!set_isempty(network
->ndisc_allow_listed_route_prefix
))
78 network
->ndisc_deny_listed_route_prefix
= set_free_free(network
->ndisc_deny_listed_route_prefix
);
81 static int ndisc_remove(Link
*link
, struct in6_addr
*router
) {
91 SET_FOREACH(route
, link
->routes
) {
92 if (route
->source
!= NETWORK_CONFIG_SOURCE_NDISC
)
94 if (!route_is_marked(route
))
96 if (router
&& !in6_addr_equal(router
, &route
->provider
.in6
))
99 k
= route_remove(route
);
103 route_cancel_request(route
, link
);
106 SET_FOREACH(address
, link
->addresses
) {
107 if (address
->source
!= NETWORK_CONFIG_SOURCE_NDISC
)
109 if (!address_is_marked(address
))
111 if (router
&& !in6_addr_equal(router
, &address
->provider
.in6
))
114 k
= address_remove(address
);
118 address_cancel_request(address
);
121 SET_FOREACH(rdnss
, link
->ndisc_rdnss
) {
124 if (router
&& !in6_addr_equal(router
, &rdnss
->router
))
127 free(set_remove(link
->ndisc_rdnss
, rdnss
));
131 SET_FOREACH(dnssl
, link
->ndisc_dnssl
) {
134 if (router
&& !in6_addr_equal(router
, &dnssl
->router
))
137 free(set_remove(link
->ndisc_dnssl
, dnssl
));
147 static int ndisc_check_ready(Link
*link
);
149 static int ndisc_address_ready_callback(Address
*address
) {
153 assert(address
->link
);
155 SET_FOREACH(a
, address
->link
->addresses
)
156 if (a
->source
== NETWORK_CONFIG_SOURCE_NDISC
)
159 return ndisc_check_ready(address
->link
);
162 static int ndisc_check_ready(Link
*link
) {
163 bool found
= false, ready
= false;
169 if (link
->ndisc_messages
> 0) {
170 log_link_debug(link
, "%s(): SLAAC addresses and routes are not set.", __func__
);
174 SET_FOREACH(address
, link
->addresses
) {
175 if (address
->source
!= NETWORK_CONFIG_SOURCE_NDISC
)
180 if (address_is_ready(address
)) {
186 if (found
&& !ready
) {
187 SET_FOREACH(address
, link
->addresses
)
188 if (address
->source
== NETWORK_CONFIG_SOURCE_NDISC
)
189 address
->callback
= ndisc_address_ready_callback
;
191 log_link_debug(link
, "%s(): no SLAAC address is ready.", __func__
);
195 link
->ndisc_configured
= true;
196 log_link_debug(link
, "SLAAC addresses and routes set.");
198 r
= ndisc_remove(link
, NULL
);
202 link_check_ready(link
);
206 static int ndisc_route_handler(sd_netlink
*rtnl
, sd_netlink_message
*m
, Request
*req
, Link
*link
, Route
*route
) {
211 r
= route_configure_handler_internal(rtnl
, m
, link
, "Could not set NDisc route");
215 r
= ndisc_check_ready(link
);
217 link_enter_failed(link
);
222 static int ndisc_request_route(Route
*in
, Link
*link
, sd_ndisc_router
*rt
) {
223 _cleanup_(route_freep
) Route
*route
= in
;
224 struct in6_addr router
;
232 r
= sd_ndisc_router_get_address(rt
, &router
);
236 route
->source
= NETWORK_CONFIG_SOURCE_NDISC
;
237 route
->provider
.in6
= router
;
238 if (!route
->table_set
)
239 route
->table
= link_get_ipv6_accept_ra_route_table(link
);
240 if (!route
->priority_set
)
241 route
->priority
= link
->network
->ipv6_accept_ra_route_metric
;
242 if (!route
->protocol_set
)
243 route
->protocol
= RTPROT_RA
;
245 if (route_get(NULL
, link
, route
, &existing
) < 0)
246 link
->ndisc_configured
= false;
248 route_unmark(existing
);
250 return link_request_route(link
, TAKE_PTR(route
), true, &link
->ndisc_messages
,
251 ndisc_route_handler
, NULL
);
254 static int ndisc_address_handler(sd_netlink
*rtnl
, sd_netlink_message
*m
, Request
*req
, Link
*link
, Address
*address
) {
259 r
= address_configure_handler_internal(rtnl
, m
, link
, "Could not set NDisc address");
263 r
= ndisc_check_ready(link
);
265 link_enter_failed(link
);
270 static int ndisc_request_address(Address
*in
, Link
*link
, sd_ndisc_router
*rt
) {
271 _cleanup_(address_freep
) Address
*address
= in
;
272 struct in6_addr router
;
280 r
= sd_ndisc_router_get_address(rt
, &router
);
284 address
->source
= NETWORK_CONFIG_SOURCE_NDISC
;
285 address
->provider
.in6
= router
;
287 if (address_get(link
, address
, &existing
) < 0)
288 link
->ndisc_configured
= false;
290 address_unmark(existing
);
292 return link_request_address(link
, TAKE_PTR(address
), true, &link
->ndisc_messages
,
293 ndisc_address_handler
, NULL
);
296 static int ndisc_router_process_default(Link
*link
, sd_ndisc_router
*rt
) {
297 usec_t lifetime_usec
, timestamp_usec
;
298 struct in6_addr gateway
;
299 uint16_t lifetime_sec
;
305 assert(link
->network
);
308 if (!link
->network
->ipv6_accept_ra_use_gateway
&&
309 hashmap_isempty(link
->network
->routes_by_section
))
312 r
= sd_ndisc_router_get_lifetime(rt
, &lifetime_sec
);
314 return log_link_error_errno(link
, r
, "Failed to get gateway lifetime from RA: %m");
316 if (lifetime_sec
== 0) /* not a default router */
319 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), ×tamp_usec
);
321 return log_link_error_errno(link
, r
, "Failed to get RA timestamp: %m");
323 lifetime_usec
= usec_add(timestamp_usec
, lifetime_sec
* USEC_PER_SEC
);
325 r
= sd_ndisc_router_get_address(rt
, &gateway
);
327 return log_link_error_errno(link
, r
, "Failed to get gateway address from RA: %m");
329 if (link_get_ipv6_address(link
, &gateway
, 0, NULL
) >= 0) {
331 _cleanup_free_
char *buffer
= NULL
;
333 (void) in6_addr_to_string(&gateway
, &buffer
);
334 log_link_debug(link
, "No NDisc route added, gateway %s matches local address",
340 r
= sd_ndisc_router_get_preference(rt
, &preference
);
342 return log_link_error_errno(link
, r
, "Failed to get default router preference from RA: %m");
344 if (link
->network
->ipv6_accept_ra_use_mtu
) {
345 r
= sd_ndisc_router_get_mtu(rt
, &mtu
);
346 if (r
< 0 && r
!= -ENODATA
)
347 return log_link_error_errno(link
, r
, "Failed to get default router MTU from RA: %m");
350 if (link
->network
->ipv6_accept_ra_use_gateway
) {
351 _cleanup_(route_freep
) Route
*route
= NULL
;
353 r
= route_new(&route
);
357 route
->family
= AF_INET6
;
358 route
->pref
= preference
;
359 route
->gw_family
= AF_INET6
;
360 route
->gw
.in6
= gateway
;
361 route
->lifetime_usec
= lifetime_usec
;
364 r
= ndisc_request_route(TAKE_PTR(route
), link
, rt
);
366 return log_link_error_errno(link
, r
, "Could not request default route: %m");
370 HASHMAP_FOREACH(route_gw
, link
->network
->routes_by_section
) {
371 _cleanup_(route_freep
) Route
*route
= NULL
;
373 if (!route_gw
->gateway_from_dhcp_or_ra
)
376 if (route_gw
->gw_family
!= AF_INET6
)
379 r
= route_dup(route_gw
, &route
);
383 route
->gw
.in6
= gateway
;
384 if (!route
->pref_set
)
385 route
->pref
= preference
;
386 route
->lifetime_usec
= lifetime_usec
;
390 r
= ndisc_request_route(TAKE_PTR(route
), link
, rt
);
392 return log_link_error_errno(link
, r
, "Could not request gateway: %m");
398 static int ndisc_router_process_autonomous_prefix(Link
*link
, sd_ndisc_router
*rt
) {
399 uint32_t lifetime_valid_sec
, lifetime_preferred_sec
;
400 usec_t lifetime_valid_usec
, lifetime_preferred_usec
, timestamp_usec
;
401 _cleanup_set_free_ Set
*addresses
= NULL
;
402 struct in6_addr prefix
, *a
;
407 assert(link
->network
);
410 if (!link
->network
->ipv6_accept_ra_use_autonomous_prefix
)
413 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), ×tamp_usec
);
415 return log_link_error_errno(link
, r
, "Failed to get RA timestamp: %m");
417 r
= sd_ndisc_router_prefix_get_address(rt
, &prefix
);
419 return log_link_error_errno(link
, r
, "Failed to get prefix address: %m");
421 r
= sd_ndisc_router_prefix_get_prefixlen(rt
, &prefixlen
);
423 return log_link_error_errno(link
, r
, "Failed to get prefix length: %m");
425 /* ndisc_generate_addresses() below requires the prefix length <= 64. */
426 if (prefixlen
> 64) {
427 _cleanup_free_
char *buf
= NULL
;
429 (void) in6_addr_prefix_to_string(&prefix
, prefixlen
, &buf
);
430 log_link_debug(link
, "Prefix is longer than 64, ignoring autonomous prefix %s.", strna(buf
));
434 r
= sd_ndisc_router_prefix_get_valid_lifetime(rt
, &lifetime_valid_sec
);
436 return log_link_error_errno(link
, r
, "Failed to get prefix valid lifetime: %m");
438 if (lifetime_valid_sec
== 0) {
439 log_link_debug(link
, "Ignoring prefix as its valid lifetime is zero.");
443 r
= sd_ndisc_router_prefix_get_preferred_lifetime(rt
, &lifetime_preferred_sec
);
445 return log_link_error_errno(link
, r
, "Failed to get prefix preferred lifetime: %m");
447 /* The preferred lifetime is never greater than the valid lifetime */
448 if (lifetime_preferred_sec
> lifetime_valid_sec
)
451 lifetime_valid_usec
= usec_add(lifetime_valid_sec
* USEC_PER_SEC
, timestamp_usec
);
452 lifetime_preferred_usec
= usec_add(lifetime_preferred_sec
* USEC_PER_SEC
, timestamp_usec
);
454 r
= ndisc_generate_addresses(link
, &prefix
, prefixlen
, &addresses
);
456 return log_link_error_errno(link
, r
, "Failed to generate SLAAC addresses: %m");
458 SET_FOREACH(a
, addresses
) {
459 _cleanup_(address_freep
) Address
*address
= NULL
;
462 r
= address_new(&address
);
466 address
->family
= AF_INET6
;
467 address
->in_addr
.in6
= *a
;
468 address
->prefixlen
= prefixlen
;
469 address
->flags
= IFA_F_NOPREFIXROUTE
|IFA_F_MANAGETEMPADDR
;
470 address
->lifetime_valid_usec
= lifetime_valid_usec
;
471 address
->lifetime_preferred_usec
= lifetime_preferred_usec
;
473 /* See RFC4862, section 5.5.3.e. But the following logic is deviated from RFC4862 by
474 * honoring all valid lifetimes to improve the reaction of SLAAC to renumbering events.
475 * See draft-ietf-6man-slaac-renum-02, section 4.2. */
476 r
= address_get(link
, address
, &e
);
478 /* If the address is already assigned, but not valid anymore, then refuse to
479 * update the address, and it will be removed. */
480 if (e
->lifetime_valid_usec
< timestamp_usec
)
484 r
= ndisc_request_address(TAKE_PTR(address
), link
, rt
);
486 return log_link_error_errno(link
, r
, "Could not request SLAAC address: %m");
492 static int ndisc_router_process_onlink_prefix(Link
*link
, sd_ndisc_router
*rt
) {
493 _cleanup_(route_freep
) Route
*route
= NULL
;
494 usec_t timestamp_usec
;
495 uint32_t lifetime_sec
;
500 assert(link
->network
);
503 if (!link
->network
->ipv6_accept_ra_use_onlink_prefix
)
506 r
= sd_ndisc_router_prefix_get_valid_lifetime(rt
, &lifetime_sec
);
508 return log_link_error_errno(link
, r
, "Failed to get prefix lifetime: %m");
510 if (lifetime_sec
== 0)
513 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), ×tamp_usec
);
515 return log_link_error_errno(link
, r
, "Failed to get RA timestamp: %m");
517 r
= sd_ndisc_router_prefix_get_prefixlen(rt
, &prefixlen
);
519 return log_link_error_errno(link
, r
, "Failed to get prefix length: %m");
521 r
= route_new(&route
);
525 route
->family
= AF_INET6
;
526 route
->flags
= RTM_F_PREFIX
;
527 route
->dst_prefixlen
= prefixlen
;
528 route
->lifetime_usec
= usec_add(timestamp_usec
, lifetime_sec
* USEC_PER_SEC
);
530 r
= sd_ndisc_router_prefix_get_address(rt
, &route
->dst
.in6
);
532 return log_link_error_errno(link
, r
, "Failed to get prefix address: %m");
534 r
= ndisc_request_route(TAKE_PTR(route
), link
, rt
);
536 return log_link_error_errno(link
, r
, "Could not request prefix route: %m");;
541 static int ndisc_router_process_prefix(Link
*link
, sd_ndisc_router
*rt
) {
548 assert(link
->network
);
551 r
= sd_ndisc_router_prefix_get_address(rt
, &a
);
553 return log_link_error_errno(link
, r
, "Failed to get prefix address: %m");
555 r
= sd_ndisc_router_prefix_get_prefixlen(rt
, &prefixlen
);
557 return log_link_error_errno(link
, r
, "Failed to get prefix length: %m");
559 if (in6_prefix_is_filtered(&a
, prefixlen
, link
->network
->ndisc_allow_listed_prefix
, link
->network
->ndisc_deny_listed_prefix
)) {
561 _cleanup_free_
char *b
= NULL
;
563 (void) in6_addr_prefix_to_string(&a
, prefixlen
, &b
);
564 if (!set_isempty(link
->network
->ndisc_allow_listed_prefix
))
565 log_link_debug(link
, "Prefix '%s' is not in allow list, ignoring", strna(b
));
567 log_link_debug(link
, "Prefix '%s' is in deny list, ignoring", strna(b
));
572 r
= sd_ndisc_router_prefix_get_flags(rt
, &flags
);
574 return log_link_error_errno(link
, r
, "Failed to get RA prefix flags: %m");
576 if (FLAGS_SET(flags
, ND_OPT_PI_FLAG_ONLINK
)) {
577 r
= ndisc_router_process_onlink_prefix(link
, rt
);
582 if (FLAGS_SET(flags
, ND_OPT_PI_FLAG_AUTO
)) {
583 r
= ndisc_router_process_autonomous_prefix(link
, rt
);
591 static int ndisc_router_process_route(Link
*link
, sd_ndisc_router
*rt
) {
592 _cleanup_(route_freep
) Route
*route
= NULL
;
593 unsigned preference
, prefixlen
;
594 struct in6_addr gateway
, dst
;
595 uint32_t lifetime_sec
;
596 usec_t timestamp_usec
;
601 if (!link
->network
->ipv6_accept_ra_use_route_prefix
)
604 r
= sd_ndisc_router_route_get_lifetime(rt
, &lifetime_sec
);
606 return log_link_error_errno(link
, r
, "Failed to get route lifetime from RA: %m");
608 if (lifetime_sec
== 0)
611 r
= sd_ndisc_router_route_get_address(rt
, &dst
);
613 return log_link_error_errno(link
, r
, "Failed to get route destination address: %m");
615 r
= sd_ndisc_router_route_get_prefixlen(rt
, &prefixlen
);
617 return log_link_error_errno(link
, r
, "Failed to get route prefix length: %m");
619 if (in6_addr_is_null(&dst
) && prefixlen
== 0) {
620 log_link_debug(link
, "Route prefix is ::/0, ignoring");
624 if (in6_prefix_is_filtered(&dst
, prefixlen
, link
->network
->ndisc_allow_listed_route_prefix
, link
->network
->ndisc_deny_listed_route_prefix
)) {
626 _cleanup_free_
char *buf
= NULL
;
628 (void) in6_addr_prefix_to_string(&dst
, prefixlen
, &buf
);
629 if (!set_isempty(link
->network
->ndisc_allow_listed_route_prefix
))
630 log_link_debug(link
, "Route prefix '%s' is not in allow list, ignoring", strna(buf
));
632 log_link_debug(link
, "Route prefix '%s' is in deny list, ignoring", strna(buf
));
637 r
= sd_ndisc_router_get_address(rt
, &gateway
);
639 return log_link_error_errno(link
, r
, "Failed to get gateway address from RA: %m");
641 if (link_get_ipv6_address(link
, &gateway
, 0, NULL
) >= 0) {
643 _cleanup_free_
char *buf
= NULL
;
645 (void) in6_addr_to_string(&gateway
, &buf
);
646 log_link_debug(link
, "Advertised route gateway %s is local to the link, ignoring route", strna(buf
));
651 r
= sd_ndisc_router_route_get_preference(rt
, &preference
);
653 return log_link_error_errno(link
, r
, "Failed to get default router preference from RA: %m");
655 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), ×tamp_usec
);
657 return log_link_error_errno(link
, r
, "Failed to get RA timestamp: %m");
659 r
= route_new(&route
);
663 route
->family
= AF_INET6
;
664 route
->pref
= preference
;
665 route
->gw
.in6
= gateway
;
666 route
->gw_family
= AF_INET6
;
667 route
->dst
.in6
= dst
;
668 route
->dst_prefixlen
= prefixlen
;
669 route
->lifetime_usec
= usec_add(timestamp_usec
, lifetime_sec
* USEC_PER_SEC
);
671 r
= ndisc_request_route(TAKE_PTR(route
), link
, rt
);
673 return log_link_error_errno(link
, r
, "Could not request additional route: %m");
678 static void ndisc_rdnss_hash_func(const NDiscRDNSS
*x
, struct siphash
*state
) {
679 siphash24_compress(&x
->address
, sizeof(x
->address
), state
);
682 static int ndisc_rdnss_compare_func(const NDiscRDNSS
*a
, const NDiscRDNSS
*b
) {
683 return memcmp(&a
->address
, &b
->address
, sizeof(a
->address
));
686 DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR(
687 ndisc_rdnss_hash_ops
,
689 ndisc_rdnss_hash_func
,
690 ndisc_rdnss_compare_func
,
693 static int ndisc_router_process_rdnss(Link
*link
, sd_ndisc_router
*rt
) {
694 usec_t lifetime_usec
, timestamp_usec
;
695 uint32_t lifetime_sec
;
696 const struct in6_addr
*a
;
697 struct in6_addr router
;
698 bool updated
= false;
702 assert(link
->network
);
705 if (!link
->network
->ipv6_accept_ra_use_dns
)
708 r
= sd_ndisc_router_get_address(rt
, &router
);
710 return log_link_error_errno(link
, r
, "Failed to get router address from RA: %m");
712 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), ×tamp_usec
);
714 return log_link_error_errno(link
, r
, "Failed to get RA timestamp: %m");
716 r
= sd_ndisc_router_rdnss_get_lifetime(rt
, &lifetime_sec
);
718 return log_link_error_errno(link
, r
, "Failed to get RDNSS lifetime: %m");
720 if (lifetime_sec
== 0)
723 lifetime_usec
= usec_add(timestamp_usec
, lifetime_sec
* USEC_PER_SEC
);
725 n
= sd_ndisc_router_rdnss_get_addresses(rt
, &a
);
727 return log_link_error_errno(link
, n
, "Failed to get RDNSS addresses: %m");
729 if (n
>= (int) NDISC_RDNSS_MAX
) {
730 log_link_warning(link
, "Too many RDNSS records per link. Only first %i records will be used.", NDISC_RDNSS_MAX
);
734 for (int j
= 0; j
< n
; j
++) {
735 _cleanup_free_ NDiscRDNSS
*x
= NULL
;
736 NDiscRDNSS
*rdnss
, d
= {
740 rdnss
= set_get(link
->ndisc_rdnss
, &d
);
742 rdnss
->marked
= false;
743 rdnss
->router
= router
;
744 rdnss
->lifetime_usec
= lifetime_usec
;
748 x
= new(NDiscRDNSS
, 1);
755 .lifetime_usec
= lifetime_usec
,
758 r
= set_ensure_consume(&link
->ndisc_rdnss
, &ndisc_rdnss_hash_ops
, TAKE_PTR(x
));
772 static void ndisc_dnssl_hash_func(const NDiscDNSSL
*x
, struct siphash
*state
) {
773 siphash24_compress_string(NDISC_DNSSL_DOMAIN(x
), state
);
776 static int ndisc_dnssl_compare_func(const NDiscDNSSL
*a
, const NDiscDNSSL
*b
) {
777 return strcmp(NDISC_DNSSL_DOMAIN(a
), NDISC_DNSSL_DOMAIN(b
));
780 DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR(
781 ndisc_dnssl_hash_ops
,
783 ndisc_dnssl_hash_func
,
784 ndisc_dnssl_compare_func
,
787 static int ndisc_router_process_dnssl(Link
*link
, sd_ndisc_router
*rt
) {
788 _cleanup_strv_free_
char **l
= NULL
;
789 usec_t lifetime_usec
, timestamp_usec
;
790 struct in6_addr router
;
791 uint32_t lifetime_sec
;
792 bool updated
= false;
796 assert(link
->network
);
799 if (link
->network
->ipv6_accept_ra_use_domains
== DHCP_USE_DOMAINS_NO
)
802 r
= sd_ndisc_router_get_address(rt
, &router
);
804 return log_link_error_errno(link
, r
, "Failed to get router address from RA: %m");
806 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), ×tamp_usec
);
808 return log_link_error_errno(link
, r
, "Failed to get RA timestamp: %m");
810 r
= sd_ndisc_router_dnssl_get_lifetime(rt
, &lifetime_sec
);
812 return log_link_error_errno(link
, r
, "Failed to get DNSSL lifetime: %m");
814 if (lifetime_sec
== 0)
817 lifetime_usec
= usec_add(timestamp_usec
, lifetime_sec
* USEC_PER_SEC
);
819 r
= sd_ndisc_router_dnssl_get_domains(rt
, &l
);
821 return log_link_error_errno(link
, r
, "Failed to get DNSSL addresses: %m");
823 if (strv_length(l
) >= NDISC_DNSSL_MAX
) {
824 log_link_warning(link
, "Too many DNSSL records per link. Only first %i records will be used.", NDISC_DNSSL_MAX
);
825 STRV_FOREACH(j
, l
+ NDISC_DNSSL_MAX
)
830 _cleanup_free_ NDiscDNSSL
*s
= NULL
;
833 s
= malloc0(ALIGN(sizeof(NDiscDNSSL
)) + strlen(*j
) + 1);
837 strcpy(NDISC_DNSSL_DOMAIN(s
), *j
);
839 dnssl
= set_get(link
->ndisc_dnssl
, s
);
841 dnssl
->marked
= false;
842 dnssl
->router
= router
;
843 dnssl
->lifetime_usec
= lifetime_usec
;
848 s
->lifetime_usec
= lifetime_usec
;
850 r
= set_ensure_consume(&link
->ndisc_dnssl
, &ndisc_dnssl_hash_ops
, TAKE_PTR(s
));
864 static int ndisc_router_process_options(Link
*link
, sd_ndisc_router
*rt
) {
868 assert(link
->network
);
871 for (r
= sd_ndisc_router_option_rewind(rt
); ; r
= sd_ndisc_router_option_next(rt
)) {
875 return log_link_error_errno(link
, r
, "Failed to iterate through options: %m");
876 if (r
== 0) /* EOF */
879 r
= sd_ndisc_router_option_get_type(rt
, &type
);
881 return log_link_error_errno(link
, r
, "Failed to get RA option type: %m");
885 case SD_NDISC_OPTION_PREFIX_INFORMATION
:
886 r
= ndisc_router_process_prefix(link
, rt
);
891 case SD_NDISC_OPTION_ROUTE_INFORMATION
:
892 r
= ndisc_router_process_route(link
, rt
);
897 case SD_NDISC_OPTION_RDNSS
:
898 r
= ndisc_router_process_rdnss(link
, rt
);
903 case SD_NDISC_OPTION_DNSSL
:
904 r
= ndisc_router_process_dnssl(link
, rt
);
912 static void ndisc_mark(Link
*link
, const struct in6_addr
*router
) {
919 link_mark_addresses(link
, NETWORK_CONFIG_SOURCE_NDISC
, router
);
920 link_mark_routes(link
, NETWORK_CONFIG_SOURCE_NDISC
, router
);
922 SET_FOREACH(rdnss
, link
->ndisc_rdnss
)
923 if (in6_addr_equal(&rdnss
->router
, router
))
924 rdnss
->marked
= true;
926 SET_FOREACH(dnssl
, link
->ndisc_dnssl
)
927 if (in6_addr_equal(&dnssl
->router
, router
))
928 dnssl
->marked
= true;
931 static int ndisc_start_dhcp6_client(Link
*link
, sd_ndisc_router
*rt
) {
935 assert(link
->network
);
937 switch (link
->network
->ipv6_accept_ra_start_dhcp6_client
) {
938 case IPV6_ACCEPT_RA_START_DHCP6_CLIENT_NO
:
941 case IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES
: {
944 r
= sd_ndisc_router_get_flags(rt
, &flags
);
946 return log_link_warning_errno(link
, r
, "Failed to get RA flags: %m");
948 if ((flags
& (ND_RA_FLAG_MANAGED
| ND_RA_FLAG_OTHER
)) == 0)
951 /* (re)start DHCPv6 client in stateful or stateless mode according to RA flags.
952 * Note, if both managed and other information bits are set, then ignore other
953 * information bit. See RFC 4861. */
954 r
= dhcp6_start_on_ra(link
, !(flags
& ND_RA_FLAG_MANAGED
));
957 case IPV6_ACCEPT_RA_START_DHCP6_CLIENT_ALWAYS
:
958 /* When IPv6AcceptRA.DHCPv6Client=always, start dhcp6 client in managed mode
959 * even if the router flags have neither M nor O flags. */
960 r
= dhcp6_start_on_ra(link
, /* information_request = */ false);
964 assert_not_reached();
968 return log_link_error_errno(link
, r
, "Could not acquire DHCPv6 lease on NDisc request: %m");
970 log_link_debug(link
, "Acquiring DHCPv6 lease on NDisc request");
974 static int ndisc_router_handler(Link
*link
, sd_ndisc_router
*rt
) {
975 struct in6_addr router
;
979 assert(link
->network
);
980 assert(link
->manager
);
983 r
= sd_ndisc_router_get_address(rt
, &router
);
985 return log_link_error_errno(link
, r
, "Failed to get router address from RA: %m");
987 if (in6_prefix_is_filtered(&router
, 128, link
->network
->ndisc_allow_listed_router
, link
->network
->ndisc_deny_listed_router
)) {
989 _cleanup_free_
char *buf
= NULL
;
991 (void) in6_addr_to_string(&router
, &buf
);
992 if (!set_isempty(link
->network
->ndisc_allow_listed_router
))
993 log_link_debug(link
, "Router '%s' is not in allow list, ignoring", strna(buf
));
995 log_link_debug(link
, "Router '%s' is in deny list, ignoring", strna(buf
));
1000 ndisc_mark(link
, &router
);
1002 r
= ndisc_start_dhcp6_client(link
, rt
);
1006 r
= ndisc_router_process_default(link
, rt
);
1010 r
= ndisc_router_process_options(link
, rt
);
1014 if (link
->ndisc_messages
== 0) {
1015 link
->ndisc_configured
= true;
1017 r
= ndisc_remove(link
, &router
);
1021 log_link_debug(link
, "Setting SLAAC addresses and router.");
1023 if (!link
->ndisc_configured
)
1024 link_set_state(link
, LINK_STATE_CONFIGURING
);
1026 link_check_ready(link
);
1030 static void ndisc_handler(sd_ndisc
*nd
, sd_ndisc_event_t event
, sd_ndisc_router
*rt
, void *userdata
) {
1031 Link
*link
= userdata
;
1036 if (IN_SET(link
->state
, LINK_STATE_FAILED
, LINK_STATE_LINGER
))
1041 case SD_NDISC_EVENT_ROUTER
:
1042 r
= ndisc_router_handler(link
, rt
);
1044 link_enter_failed(link
);
1049 case SD_NDISC_EVENT_TIMEOUT
:
1050 log_link_debug(link
, "NDisc handler get timeout event");
1051 if (link
->ndisc_messages
== 0) {
1052 link
->ndisc_configured
= true;
1053 link_check_ready(link
);
1057 assert_not_reached();
1061 static int ndisc_configure(Link
*link
) {
1066 if (!link_ipv6_accept_ra_enabled(link
))
1070 return -EBUSY
; /* Already configured. */
1072 r
= sd_ndisc_new(&link
->ndisc
);
1076 r
= sd_ndisc_attach_event(link
->ndisc
, link
->manager
->event
, 0);
1080 r
= sd_ndisc_set_mac(link
->ndisc
, &link
->hw_addr
.ether
);
1084 r
= sd_ndisc_set_ifindex(link
->ndisc
, link
->ifindex
);
1088 r
= sd_ndisc_set_callback(link
->ndisc
, ndisc_handler
, link
);
1095 int ndisc_start(Link
*link
) {
1100 if (!link
->ndisc
|| !link
->dhcp6_client
)
1103 if (!link_has_carrier(link
))
1106 if (in6_addr_is_null(&link
->ipv6ll_address
))
1109 log_link_debug(link
, "Discovering IPv6 routers");
1111 r
= sd_ndisc_start(link
->ndisc
);
1118 static int ndisc_process_request(Request
*req
, Link
*link
, void *userdata
) {
1123 if (!IN_SET(link
->state
, LINK_STATE_CONFIGURING
, LINK_STATE_CONFIGURED
))
1126 if (link
->hw_addr
.length
!= ETH_ALEN
|| hw_addr_is_null(&link
->hw_addr
))
1127 /* No MAC address is assigned to the hardware, or non-supported MAC address length. */
1130 r
= ndisc_configure(link
);
1132 return log_link_warning_errno(link
, r
, "Failed to configure IPv6 Router Discovery: %m");
1134 r
= ndisc_start(link
);
1136 return log_link_warning_errno(link
, r
, "Failed to start IPv6 Router Discovery: %m");
1138 log_link_debug(link
, "IPv6 Router Discovery is configured%s.",
1139 r
> 0 ? " and started" : "");
1143 int link_request_ndisc(Link
*link
) {
1148 if (!link_ipv6_accept_ra_enabled(link
))
1154 r
= link_queue_request(link
, REQUEST_TYPE_NDISC
, ndisc_process_request
, NULL
);
1156 return log_link_warning_errno(link
, r
, "Failed to request configuring of the IPv6 Router Discovery: %m");
1158 log_link_debug(link
, "Requested configuring of the IPv6 Router Discovery.");
1162 void ndisc_vacuum(Link
*link
) {
1169 /* Removes all RDNSS and DNSSL entries whose validity time has passed */
1171 time_now
= now(clock_boottime_or_monotonic());
1173 SET_FOREACH(r
, link
->ndisc_rdnss
)
1174 if (r
->lifetime_usec
< time_now
)
1175 free(set_remove(link
->ndisc_rdnss
, r
));
1177 SET_FOREACH(d
, link
->ndisc_dnssl
)
1178 if (d
->lifetime_usec
< time_now
)
1179 free(set_remove(link
->ndisc_dnssl
, d
));
1182 void ndisc_flush(Link
*link
) {
1185 /* Removes all RDNSS and DNSSL entries, without exception */
1187 link
->ndisc_rdnss
= set_free(link
->ndisc_rdnss
);
1188 link
->ndisc_dnssl
= set_free(link
->ndisc_dnssl
);
1191 static const char* const ipv6_accept_ra_start_dhcp6_client_table
[_IPV6_ACCEPT_RA_START_DHCP6_CLIENT_MAX
] = {
1192 [IPV6_ACCEPT_RA_START_DHCP6_CLIENT_NO
] = "no",
1193 [IPV6_ACCEPT_RA_START_DHCP6_CLIENT_ALWAYS
] = "always",
1194 [IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES
] = "yes",
1197 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING_WITH_BOOLEAN(ipv6_accept_ra_start_dhcp6_client
, IPv6AcceptRAStartDHCP6Client
, IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES
);
1199 DEFINE_CONFIG_PARSE_ENUM(config_parse_ipv6_accept_ra_use_domains
, dhcp_use_domains
, DHCPUseDomains
,
1200 "Failed to parse UseDomains= setting");
1201 DEFINE_CONFIG_PARSE_ENUM(config_parse_ipv6_accept_ra_start_dhcp6_client
, ipv6_accept_ra_start_dhcp6_client
, IPv6AcceptRAStartDHCP6Client
,
1202 "Failed to parse DHCPv6Client= setting");