1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
3 Copyright © 2017 Intel Corporation. All rights reserved.
6 #include <netinet/icmp6.h>
7 #include <netinet/in.h>
12 #include "alloc-util.h"
13 #include "dns-domain.h"
14 #include "ether-addr-util.h"
15 #include "event-util.h"
17 #include "icmp6-util.h"
18 #include "in-addr-util.h"
21 #include "memory-util.h"
22 #include "network-common.h"
23 #include "radv-internal.h"
24 #include "random-util.h"
25 #include "socket-util.h"
26 #include "string-util.h"
29 int sd_radv_new(sd_radv
**ret
) {
30 _cleanup_(sd_radv_unrefp
) sd_radv
*ra
= NULL
;
32 assert_return(ret
, -EINVAL
);
41 .lifetime_usec
= RADV_DEFAULT_ROUTER_LIFETIME_USEC
,
49 int sd_radv_attach_event(sd_radv
*ra
, sd_event
*event
, int64_t priority
) {
52 assert_return(ra
, -EINVAL
);
53 assert_return(!ra
->event
, -EBUSY
);
56 ra
->event
= sd_event_ref(event
);
58 r
= sd_event_default(&ra
->event
);
63 ra
->event_priority
= priority
;
68 int sd_radv_detach_event(sd_radv
*ra
) {
70 assert_return(ra
, -EINVAL
);
72 ra
->event
= sd_event_unref(ra
->event
);
76 sd_event
*sd_radv_get_event(sd_radv
*ra
) {
77 assert_return(ra
, NULL
);
82 int sd_radv_is_running(sd_radv
*ra
) {
83 assert_return(ra
, false);
85 return ra
->state
!= RADV_STATE_IDLE
;
88 static void radv_reset(sd_radv
*ra
) {
91 (void) event_source_disable(ra
->timeout_event_source
);
93 ra
->recv_event_source
= sd_event_source_disable_unref(ra
->recv_event_source
);
98 static sd_radv
*radv_free(sd_radv
*ra
) {
102 while (ra
->prefixes
) {
103 sd_radv_prefix
*p
= ra
->prefixes
;
105 LIST_REMOVE(prefix
, ra
->prefixes
, p
);
106 sd_radv_prefix_unref(p
);
109 while (ra
->route_prefixes
) {
110 sd_radv_route_prefix
*p
= ra
->route_prefixes
;
112 LIST_REMOVE(prefix
, ra
->route_prefixes
, p
);
113 sd_radv_route_prefix_unref(p
);
121 sd_event_source_unref(ra
->timeout_event_source
);
122 sd_radv_detach_event(ra
);
124 ra
->fd
= safe_close(ra
->fd
);
130 DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv
, sd_radv
, radv_free
);
132 static bool router_lifetime_is_valid(usec_t lifetime_usec
) {
133 return lifetime_usec
== 0 ||
134 (lifetime_usec
>= RADV_MIN_ROUTER_LIFETIME_USEC
&&
135 lifetime_usec
<= RADV_MAX_ROUTER_LIFETIME_USEC
);
138 static be32_t
usec_to_be32_sec(usec_t usec
) {
139 if (usec
== USEC_INFINITY
)
140 /* UINT32_MAX is handled as infinity. */
141 return htobe32(UINT32_MAX
);
143 if (usec
>= UINT32_MAX
* USEC_PER_SEC
)
144 /* Finite but too large. Let's use the largest finite value. */
145 return htobe32(UINT32_MAX
- 1);
147 return htobe32(usec
/ USEC_PER_SEC
);
150 static int radv_send(sd_radv
*ra
, const struct in6_addr
*dst
, usec_t lifetime_usec
) {
151 struct sockaddr_in6 dst_addr
= {
152 .sin6_family
= AF_INET6
,
153 .sin6_addr
= IN6ADDR_ALL_NODES_MULTICAST_INIT
,
155 struct nd_router_advert adv
= {};
157 struct nd_opt_hdr opthdr
;
158 struct ether_addr slladdr
;
159 } _packed_ opt_mac
= {
161 .nd_opt_type
= ND_OPT_SOURCE_LINKADDR
,
162 .nd_opt_len
= (sizeof(struct nd_opt_hdr
) +
163 sizeof(struct ether_addr
) - 1) /8 + 1,
166 struct nd_opt_mtu opt_mtu
= {
167 .nd_opt_mtu_type
= ND_OPT_MTU
,
170 /* Reserve iov space for RA header, linkaddr, MTU, N prefixes, N routes, RDNSS
172 struct iovec iov
[5 + ra
->n_prefixes
+ ra
->n_route_prefixes
];
173 struct msghdr msg
= {
174 .msg_name
= &dst_addr
,
175 .msg_namelen
= sizeof(dst_addr
),
182 assert(router_lifetime_is_valid(lifetime_usec
));
184 r
= sd_event_now(ra
->event
, clock_boottime_or_monotonic(), &time_now
);
188 if (dst
&& in6_addr_is_set(dst
))
189 dst_addr
.sin6_addr
= *dst
;
191 adv
.nd_ra_type
= ND_ROUTER_ADVERT
;
192 adv
.nd_ra_curhoplimit
= ra
->hop_limit
;
193 adv
.nd_ra_flags_reserved
= ra
->flags
;
194 assert_cc(RADV_MAX_ROUTER_LIFETIME_USEC
<= UINT16_MAX
* USEC_PER_SEC
);
195 adv
.nd_ra_router_lifetime
= htobe16(DIV_ROUND_UP(lifetime_usec
, USEC_PER_SEC
));
196 iov
[msg
.msg_iovlen
++] = IOVEC_MAKE(&adv
, sizeof(adv
));
198 /* MAC address is optional, either because the link does not use L2
199 addresses or load sharing is desired. See RFC 4861, Section 4.2 */
200 if (!ether_addr_is_null(&ra
->mac_addr
)) {
201 opt_mac
.slladdr
= ra
->mac_addr
;
202 iov
[msg
.msg_iovlen
++] = IOVEC_MAKE(&opt_mac
, sizeof(opt_mac
));
206 opt_mtu
.nd_opt_mtu_mtu
= htobe32(ra
->mtu
);
207 iov
[msg
.msg_iovlen
++] = IOVEC_MAKE(&opt_mtu
, sizeof(opt_mtu
));
210 LIST_FOREACH(prefix
, p
, ra
->prefixes
) {
211 usec_t lifetime_valid_usec
, lifetime_preferred_usec
;
213 lifetime_valid_usec
= MIN(usec_sub_unsigned(p
->valid_until
, time_now
),
214 p
->lifetime_valid_usec
);
216 lifetime_preferred_usec
= MIN3(usec_sub_unsigned(p
->preferred_until
, time_now
),
217 p
->lifetime_preferred_usec
,
218 lifetime_valid_usec
);
220 p
->opt
.lifetime_valid
= usec_to_be32_sec(lifetime_valid_usec
);
221 p
->opt
.lifetime_preferred
= usec_to_be32_sec(lifetime_preferred_usec
);
223 iov
[msg
.msg_iovlen
++] = IOVEC_MAKE(&p
->opt
, sizeof(p
->opt
));
226 LIST_FOREACH(prefix
, rt
, ra
->route_prefixes
) {
227 rt
->opt
.lifetime
= usec_to_be32_sec(MIN(usec_sub_unsigned(rt
->valid_until
, time_now
),
230 iov
[msg
.msg_iovlen
++] = IOVEC_MAKE(&rt
->opt
, sizeof(rt
->opt
));
234 iov
[msg
.msg_iovlen
++] = IOVEC_MAKE(ra
->rdnss
, ra
->rdnss
->length
* 8);
237 iov
[msg
.msg_iovlen
++] = IOVEC_MAKE(ra
->dnssl
, ra
->dnssl
->length
* 8);
239 if (sendmsg(ra
->fd
, &msg
, 0) < 0)
245 static int radv_recv(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
246 sd_radv
*ra
= userdata
;
247 _cleanup_free_
char *addr
= NULL
;
249 triple_timestamp timestamp
;
252 _cleanup_free_
char *buf
= NULL
;
258 buflen
= next_datagram_size_fd(fd
);
260 if (ERRNO_IS_TRANSIENT(buflen
) || ERRNO_IS_DISCONNECT(buflen
))
263 log_radv_errno(ra
, buflen
, "Failed to determine datagram size to read, ignoring: %m");
267 buf
= new0(char, buflen
);
271 r
= icmp6_receive(fd
, buf
, buflen
, &src
, ×tamp
);
273 if (ERRNO_IS_TRANSIENT(r
) || ERRNO_IS_DISCONNECT(r
))
278 (void) in_addr_to_string(AF_INET6
, (const union in_addr_union
*) &src
, &addr
);
279 log_radv(ra
, "Received RS from non-link-local address %s. Ignoring", addr
);
283 log_radv(ra
, "Received RS with invalid hop limit. Ignoring.");
287 log_radv(ra
, "Received invalid source address from ICMPv6 socket. Ignoring.");
291 log_radv_errno(ra
, r
, "Unexpected error receiving from ICMPv6 socket, ignoring: %m");
298 if ((size_t) buflen
< sizeof(struct nd_router_solicit
)) {
299 log_radv(ra
, "Too short packet received, ignoring");
303 (void) in_addr_to_string(AF_INET6
, (const union in_addr_union
*) &src
, &addr
);
305 r
= radv_send(ra
, &src
, ra
->lifetime_usec
);
307 log_radv_errno(ra
, r
, "Unable to send solicited Router Advertisement to %s, ignoring: %m", strnull(addr
));
309 log_radv(ra
, "Sent solicited Router Advertisement to %s", strnull(addr
));
314 static int radv_timeout(sd_event_source
*s
, uint64_t usec
, void *userdata
) {
315 usec_t min_timeout
, max_timeout
, time_now
, timeout
;
316 sd_radv
*ra
= userdata
;
322 assert(router_lifetime_is_valid(ra
->lifetime_usec
));
324 r
= sd_event_now(ra
->event
, clock_boottime_or_monotonic(), &time_now
);
328 r
= radv_send(ra
, NULL
, ra
->lifetime_usec
);
330 log_radv_errno(ra
, r
, "Unable to send Router Advertisement: %m");
332 /* RFC 4861, Section 6.2.4, sending initial Router Advertisements */
333 if (ra
->ra_sent
< RADV_MAX_INITIAL_RTR_ADVERTISEMENTS
)
334 max_timeout
= RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC
;
336 max_timeout
= RADV_DEFAULT_MAX_TIMEOUT_USEC
;
338 /* RFC 4861, Section 6.2.1, lifetime must be at least MaxRtrAdvInterval,
339 * so lower the interval here */
340 if (ra
->lifetime_usec
> 0)
341 max_timeout
= MIN(max_timeout
, ra
->lifetime_usec
);
343 if (max_timeout
>= 9 * USEC_PER_SEC
)
344 min_timeout
= max_timeout
/ 3;
346 min_timeout
= max_timeout
* 3 / 4;
348 /* RFC 4861, Section 6.2.1.
349 * MaxRtrAdvInterval MUST be no less than 4 seconds and no greater than 1800 seconds.
350 * MinRtrAdvInterval MUST be no less than 3 seconds and no greater than .75 * MaxRtrAdvInterval. */
351 assert(max_timeout
>= RADV_MIN_MAX_TIMEOUT_USEC
);
352 assert(max_timeout
<= RADV_MAX_MAX_TIMEOUT_USEC
);
353 assert(min_timeout
>= RADV_MIN_MIN_TIMEOUT_USEC
);
354 assert(min_timeout
<= max_timeout
* 3 / 4);
356 timeout
= min_timeout
+ random_u64_range(max_timeout
- min_timeout
);
357 log_radv(ra
, "Next Router Advertisement in %s", FORMAT_TIMESPAN(timeout
, USEC_PER_SEC
));
359 r
= event_reset_time(ra
->event
, &ra
->timeout_event_source
,
360 clock_boottime_or_monotonic(),
361 usec_add(time_now
, timeout
), MSEC_PER_SEC
,
363 ra
->event_priority
, "radv-timeout", true);
377 int sd_radv_stop(sd_radv
*ra
) {
383 if (ra
->state
== RADV_STATE_IDLE
)
386 log_radv(ra
, "Stopping IPv6 Router Advertisement daemon");
388 /* RFC 4861, Section 6.2.5, send at least one Router Advertisement
389 with zero lifetime */
390 r
= radv_send(ra
, NULL
, 0);
392 log_radv_errno(ra
, r
, "Unable to send last Router Advertisement with router lifetime set to zero: %m");
395 ra
->fd
= safe_close(ra
->fd
);
396 ra
->state
= RADV_STATE_IDLE
;
401 int sd_radv_start(sd_radv
*ra
) {
404 assert_return(ra
, -EINVAL
);
405 assert_return(ra
->event
, -EINVAL
);
406 assert_return(ra
->ifindex
> 0, -EINVAL
);
408 if (ra
->state
!= RADV_STATE_IDLE
)
411 r
= event_reset_time(ra
->event
, &ra
->timeout_event_source
,
412 clock_boottime_or_monotonic(),
415 ra
->event_priority
, "radv-timeout", true);
419 r
= icmp6_bind_router_advertisement(ra
->ifindex
);
425 r
= sd_event_add_io(ra
->event
, &ra
->recv_event_source
, ra
->fd
, EPOLLIN
, radv_recv
, ra
);
429 r
= sd_event_source_set_priority(ra
->recv_event_source
, ra
->event_priority
);
433 (void) sd_event_source_set_description(ra
->recv_event_source
, "radv-receive-message");
435 ra
->state
= RADV_STATE_ADVERTISING
;
437 log_radv(ra
, "Started IPv6 Router Advertisement daemon");
447 int sd_radv_set_ifindex(sd_radv
*ra
, int ifindex
) {
448 assert_return(ra
, -EINVAL
);
449 assert_return(ifindex
> 0, -EINVAL
);
451 if (ra
->state
!= RADV_STATE_IDLE
)
454 ra
->ifindex
= ifindex
;
459 int sd_radv_set_ifname(sd_radv
*ra
, const char *ifname
) {
460 assert_return(ra
, -EINVAL
);
461 assert_return(ifname
, -EINVAL
);
463 if (!ifname_valid_full(ifname
, IFNAME_VALID_ALTERNATIVE
))
466 return free_and_strdup(&ra
->ifname
, ifname
);
469 int sd_radv_get_ifname(sd_radv
*ra
, const char **ret
) {
472 assert_return(ra
, -EINVAL
);
474 r
= get_ifname(ra
->ifindex
, &ra
->ifname
);
484 int sd_radv_set_mac(sd_radv
*ra
, const struct ether_addr
*mac_addr
) {
485 assert_return(ra
, -EINVAL
);
487 if (ra
->state
!= RADV_STATE_IDLE
)
491 ra
->mac_addr
= *mac_addr
;
498 int sd_radv_set_mtu(sd_radv
*ra
, uint32_t mtu
) {
499 assert_return(ra
, -EINVAL
);
500 assert_return(mtu
>= 1280, -EINVAL
);
507 int sd_radv_set_hop_limit(sd_radv
*ra
, uint8_t hop_limit
) {
508 assert_return(ra
, -EINVAL
);
510 if (ra
->state
!= RADV_STATE_IDLE
)
513 ra
->hop_limit
= hop_limit
;
518 int sd_radv_set_router_lifetime(sd_radv
*ra
, uint64_t lifetime_usec
) {
519 assert_return(ra
, -EINVAL
);
521 if (ra
->state
!= RADV_STATE_IDLE
)
524 if (!router_lifetime_is_valid(lifetime_usec
))
527 /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the preference value MUST be set
528 * to (00) by the sender..." */
529 if (lifetime_usec
== 0 &&
530 (ra
->flags
& (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM
<< 3))
533 ra
->lifetime_usec
= lifetime_usec
;
538 int sd_radv_set_managed_information(sd_radv
*ra
, int managed
) {
539 assert_return(ra
, -EINVAL
);
541 if (ra
->state
!= RADV_STATE_IDLE
)
544 SET_FLAG(ra
->flags
, ND_RA_FLAG_MANAGED
, managed
);
549 int sd_radv_set_other_information(sd_radv
*ra
, int other
) {
550 assert_return(ra
, -EINVAL
);
552 if (ra
->state
!= RADV_STATE_IDLE
)
555 SET_FLAG(ra
->flags
, ND_RA_FLAG_OTHER
, other
);
560 int sd_radv_set_preference(sd_radv
*ra
, unsigned preference
) {
561 assert_return(ra
, -EINVAL
);
562 assert_return(IN_SET(preference
,
563 SD_NDISC_PREFERENCE_LOW
,
564 SD_NDISC_PREFERENCE_MEDIUM
,
565 SD_NDISC_PREFERENCE_HIGH
), -EINVAL
);
567 /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the preference value MUST be set
568 * to (00) by the sender..." */
569 if (ra
->lifetime_usec
== 0 && preference
!= SD_NDISC_PREFERENCE_MEDIUM
)
572 ra
->flags
= (ra
->flags
& ~(0x3 << 3)) | (preference
<< 3);
577 int sd_radv_add_prefix(sd_radv
*ra
, sd_radv_prefix
*p
) {
578 _cleanup_free_
char *addr_p
= NULL
;
579 sd_radv_prefix
*found
= NULL
;
582 assert_return(ra
, -EINVAL
);
583 assert_return(p
, -EINVAL
);
585 /* Refuse prefixes that don't have a prefix set */
586 if (in6_addr_is_null(&p
->opt
.in6_addr
))
589 (void) in6_addr_prefix_to_string(&p
->opt
.in6_addr
, p
->opt
.prefixlen
, &addr_p
);
591 LIST_FOREACH(prefix
, cur
, ra
->prefixes
) {
593 r
= in_addr_prefix_intersect(AF_INET6
,
594 (const union in_addr_union
*) &cur
->opt
.in6_addr
,
596 (const union in_addr_union
*) &p
->opt
.in6_addr
,
603 if (cur
->opt
.prefixlen
== p
->opt
.prefixlen
) {
608 _cleanup_free_
char *addr_cur
= NULL
;
609 (void) in6_addr_prefix_to_string(&cur
->opt
.in6_addr
, cur
->opt
.prefixlen
, &addr_cur
);
610 return log_radv_errno(ra
, SYNTHETIC_ERRNO(EEXIST
),
611 "IPv6 prefix %s conflicts with %s, ignoring.",
612 strna(addr_p
), strna(addr_cur
));
616 /* p and cur may be equivalent. First increment the reference counter. */
617 sd_radv_prefix_ref(p
);
619 /* Then, remove the old entry. */
620 LIST_REMOVE(prefix
, ra
->prefixes
, found
);
621 sd_radv_prefix_unref(found
);
623 /* Finally, add the new entry. */
624 LIST_APPEND(prefix
, ra
->prefixes
, p
);
626 log_radv(ra
, "Updated/replaced IPv6 prefix %s (preferred: %s, valid: %s)",
628 FORMAT_TIMESPAN(p
->lifetime_preferred_usec
, USEC_PER_SEC
),
629 FORMAT_TIMESPAN(p
->lifetime_valid_usec
, USEC_PER_SEC
));
631 /* The prefix is new. Let's simply add it. */
633 sd_radv_prefix_ref(p
);
634 LIST_APPEND(prefix
, ra
->prefixes
, p
);
637 log_radv(ra
, "Added prefix %s", strna(addr_p
));
640 if (ra
->state
== RADV_STATE_IDLE
)
643 if (ra
->ra_sent
== 0)
646 /* If RAs have already been sent, send an RA immediately to announce the newly-added prefix */
647 r
= radv_send(ra
, NULL
, ra
->lifetime_usec
);
649 log_radv_errno(ra
, r
, "Unable to send Router Advertisement for added prefix %s: %m",
652 log_radv(ra
, "Sent Router Advertisement for added/updated prefix %s.", strna(addr_p
));
657 void sd_radv_remove_prefix(
659 const struct in6_addr
*prefix
,
660 unsigned char prefixlen
) {
668 LIST_FOREACH(prefix
, cur
, ra
->prefixes
) {
669 if (prefixlen
!= cur
->opt
.prefixlen
)
672 if (!in6_addr_equal(prefix
, &cur
->opt
.in6_addr
))
675 LIST_REMOVE(prefix
, ra
->prefixes
, cur
);
677 sd_radv_prefix_unref(cur
);
682 int sd_radv_add_route_prefix(sd_radv
*ra
, sd_radv_route_prefix
*p
) {
683 _cleanup_free_
char *addr_p
= NULL
;
684 sd_radv_route_prefix
*found
= NULL
;
687 assert_return(ra
, -EINVAL
);
688 assert_return(p
, -EINVAL
);
690 (void) in6_addr_prefix_to_string(&p
->opt
.in6_addr
, p
->opt
.prefixlen
, &addr_p
);
692 LIST_FOREACH(prefix
, cur
, ra
->route_prefixes
) {
694 r
= in_addr_prefix_intersect(AF_INET6
,
695 (const union in_addr_union
*) &cur
->opt
.in6_addr
,
697 (const union in_addr_union
*) &p
->opt
.in6_addr
,
704 if (cur
->opt
.prefixlen
== p
->opt
.prefixlen
) {
709 _cleanup_free_
char *addr_cur
= NULL
;
710 (void) in6_addr_prefix_to_string(&cur
->opt
.in6_addr
, cur
->opt
.prefixlen
, &addr_cur
);
711 return log_radv_errno(ra
, SYNTHETIC_ERRNO(EEXIST
),
712 "IPv6 route prefix %s conflicts with %s, ignoring.",
713 strna(addr_p
), strna(addr_cur
));
717 /* p and cur may be equivalent. First increment the reference counter. */
718 sd_radv_route_prefix_ref(p
);
720 /* Then, remove the old entry. */
721 LIST_REMOVE(prefix
, ra
->route_prefixes
, found
);
722 sd_radv_route_prefix_unref(found
);
724 /* Finally, add the new entry. */
725 LIST_APPEND(prefix
, ra
->route_prefixes
, p
);
727 log_radv(ra
, "Updated/replaced IPv6 route prefix %s (lifetime: %s)",
729 FORMAT_TIMESPAN(p
->lifetime_usec
, USEC_PER_SEC
));
731 /* The route prefix is new. Let's simply add it. */
733 sd_radv_route_prefix_ref(p
);
734 LIST_APPEND(prefix
, ra
->route_prefixes
, p
);
735 ra
->n_route_prefixes
++;
737 log_radv(ra
, "Added route prefix %s", strna(addr_p
));
740 if (ra
->state
== RADV_STATE_IDLE
)
743 if (ra
->ra_sent
== 0)
746 /* If RAs have already been sent, send an RA immediately to announce the newly-added route prefix */
747 r
= radv_send(ra
, NULL
, ra
->lifetime_usec
);
749 log_radv_errno(ra
, r
, "Unable to send Router Advertisement for added route prefix %s: %m",
752 log_radv(ra
, "Sent Router Advertisement for added route prefix %s.", strna(addr_p
));
757 int sd_radv_set_rdnss(
760 const struct in6_addr
*dns
,
763 _cleanup_free_
struct sd_radv_opt_dns
*opt_rdnss
= NULL
;
766 assert_return(ra
, -EINVAL
);
767 assert_return(n_dns
< 128, -EINVAL
);
769 if (!dns
|| n_dns
== 0) {
770 ra
->rdnss
= mfree(ra
->rdnss
);
776 len
= sizeof(struct sd_radv_opt_dns
) + sizeof(struct in6_addr
) * n_dns
;
778 opt_rdnss
= malloc0(len
);
782 opt_rdnss
->type
= RADV_OPT_RDNSS
;
783 opt_rdnss
->length
= len
/ 8;
784 opt_rdnss
->lifetime
= htobe32(lifetime
);
786 memcpy(opt_rdnss
+ 1, dns
, n_dns
* sizeof(struct in6_addr
));
788 free_and_replace(ra
->rdnss
, opt_rdnss
);
795 int sd_radv_set_dnssl(
798 char **search_list
) {
800 _cleanup_free_
struct sd_radv_opt_dns
*opt_dnssl
= NULL
;
804 assert_return(ra
, -EINVAL
);
806 if (strv_isempty(search_list
)) {
807 ra
->dnssl
= mfree(ra
->dnssl
);
811 STRV_FOREACH(s
, search_list
)
812 len
+= strlen(*s
) + 2;
814 len
= (sizeof(struct sd_radv_opt_dns
) + len
+ 7) & ~0x7;
816 opt_dnssl
= malloc0(len
);
820 opt_dnssl
->type
= RADV_OPT_DNSSL
;
821 opt_dnssl
->length
= len
/ 8;
822 opt_dnssl
->lifetime
= htobe32(lifetime
);
824 p
= (uint8_t *)(opt_dnssl
+ 1);
825 len
-= sizeof(struct sd_radv_opt_dns
);
827 STRV_FOREACH(s
, search_list
) {
830 r
= dns_name_to_wire_format(*s
, p
, len
, false);
841 free_and_replace(ra
->dnssl
, opt_dnssl
);
846 int sd_radv_prefix_new(sd_radv_prefix
**ret
) {
849 assert_return(ret
, -EINVAL
);
851 p
= new(sd_radv_prefix
, 1);
855 *p
= (sd_radv_prefix
) {
858 .opt
.type
= ND_OPT_PREFIX_INFORMATION
,
859 .opt
.length
= (sizeof(p
->opt
) - 1)/8 + 1,
862 /* RFC 4861, Section 6.2.1 */
863 .opt
.flags
= ND_OPT_PI_FLAG_ONLINK
|ND_OPT_PI_FLAG_AUTO
,
865 .lifetime_valid_usec
= RADV_DEFAULT_VALID_LIFETIME_USEC
,
866 .lifetime_preferred_usec
= RADV_DEFAULT_PREFERRED_LIFETIME_USEC
,
867 .valid_until
= USEC_INFINITY
,
868 .preferred_until
= USEC_INFINITY
,
875 DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_prefix
, sd_radv_prefix
, mfree
);
877 int sd_radv_prefix_set_prefix(
879 const struct in6_addr
*in6_addr
,
880 unsigned char prefixlen
) {
882 assert_return(p
, -EINVAL
);
883 assert_return(in6_addr
, -EINVAL
);
885 if (prefixlen
< 3 || prefixlen
> 128)
889 /* unusual but allowed, log it */
890 log_radv(NULL
, "Unusual prefix length %d greater than 64", prefixlen
);
892 p
->opt
.in6_addr
= *in6_addr
;
893 p
->opt
.prefixlen
= prefixlen
;
898 int sd_radv_prefix_get_prefix(
900 struct in6_addr
*ret_in6_addr
,
901 unsigned char *ret_prefixlen
) {
903 assert_return(p
, -EINVAL
);
904 assert_return(ret_in6_addr
, -EINVAL
);
905 assert_return(ret_prefixlen
, -EINVAL
);
907 *ret_in6_addr
= p
->opt
.in6_addr
;
908 *ret_prefixlen
= p
->opt
.prefixlen
;
913 int sd_radv_prefix_set_onlink(sd_radv_prefix
*p
, int onlink
) {
914 assert_return(p
, -EINVAL
);
916 SET_FLAG(p
->opt
.flags
, ND_OPT_PI_FLAG_ONLINK
, onlink
);
921 int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix
*p
, int address_autoconfiguration
) {
922 assert_return(p
, -EINVAL
);
924 SET_FLAG(p
->opt
.flags
, ND_OPT_PI_FLAG_AUTO
, address_autoconfiguration
);
929 int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix
*p
, uint64_t lifetime_usec
, uint64_t valid_until
) {
930 assert_return(p
, -EINVAL
);
932 p
->lifetime_valid_usec
= lifetime_usec
;
933 p
->valid_until
= valid_until
;
938 int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix
*p
, uint64_t lifetime_usec
, uint64_t valid_until
) {
939 assert_return(p
, -EINVAL
);
941 p
->lifetime_preferred_usec
= lifetime_usec
;
942 p
->preferred_until
= valid_until
;
947 int sd_radv_route_prefix_new(sd_radv_route_prefix
**ret
) {
948 sd_radv_route_prefix
*p
;
950 assert_return(ret
, -EINVAL
);
952 p
= new(sd_radv_route_prefix
, 1);
956 *p
= (sd_radv_route_prefix
) {
959 .opt
.type
= RADV_OPT_ROUTE_INFORMATION
,
960 .opt
.length
= DIV_ROUND_UP(sizeof(p
->opt
), 8),
963 .lifetime_usec
= RADV_DEFAULT_VALID_LIFETIME_USEC
,
964 .valid_until
= USEC_INFINITY
,
971 DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_route_prefix
, sd_radv_route_prefix
, mfree
);
973 int sd_radv_route_prefix_set_prefix(
974 sd_radv_route_prefix
*p
,
975 const struct in6_addr
*in6_addr
,
976 unsigned char prefixlen
) {
978 assert_return(p
, -EINVAL
);
979 assert_return(in6_addr
, -EINVAL
);
985 /* unusual but allowed, log it */
986 log_radv(NULL
, "Unusual prefix length %u greater than 64", prefixlen
);
988 p
->opt
.in6_addr
= *in6_addr
;
989 p
->opt
.prefixlen
= prefixlen
;
994 int sd_radv_route_prefix_set_lifetime(sd_radv_route_prefix
*p
, uint64_t lifetime_usec
, uint64_t valid_until
) {
995 assert_return(p
, -EINVAL
);
997 p
->lifetime_usec
= lifetime_usec
;
998 p
->valid_until
= valid_until
;