2 This file is part of systemd.
4 Copyright (C) 2014 Intel Corporation. All rights reserved.
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20 #include <netinet/icmp6.h>
25 #include "networkd-ndisc.h"
27 #define NDISC_DNSSL_MAX 64U
28 #define NDISC_RDNSS_MAX 64U
30 static int ndisc_netlink_handler(sd_netlink
*rtnl
, sd_netlink_message
*m
, void *userdata
) {
31 _cleanup_link_unref_ Link
*link
= userdata
;
35 assert(link
->ndisc_messages
> 0);
37 link
->ndisc_messages
--;
39 r
= sd_netlink_message_get_errno(m
);
40 if (r
< 0 && r
!= -EEXIST
) {
41 log_link_error_errno(link
, r
, "Could not set NDisc route or address: %m");
42 link_enter_failed(link
);
45 if (link
->ndisc_messages
== 0) {
46 link
->ndisc_configured
= true;
47 link_check_ready(link
);
53 static void ndisc_router_process_default(Link
*link
, sd_ndisc_router
*rt
) {
54 _cleanup_route_free_ Route
*route
= NULL
;
55 struct in6_addr gateway
;
64 r
= sd_ndisc_router_get_lifetime(rt
, &lifetime
);
66 log_link_warning_errno(link
, r
, "Failed to get gateway address from RA: %m");
69 if (lifetime
== 0) /* not a default router */
72 r
= sd_ndisc_router_get_address(rt
, &gateway
);
74 log_link_warning_errno(link
, r
, "Failed to get gateway address from RA: %m");
78 r
= sd_ndisc_router_get_preference(rt
, &preference
);
80 log_link_warning_errno(link
, r
, "Failed to get default router preference from RA: %m");
84 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), &time_now
);
86 log_link_warning_errno(link
, r
, "Failed to get RA timestamp: %m");
90 r
= route_new(&route
);
92 log_link_error_errno(link
, r
, "Could not allocate route: %m");
96 route
->family
= AF_INET6
;
97 route
->table
= RT_TABLE_MAIN
;
98 route
->protocol
= RTPROT_RA
;
99 route
->pref
= preference
;
100 route
->gw
.in6
= gateway
;
101 route
->lifetime
= time_now
+ lifetime
* USEC_PER_SEC
;
103 r
= route_configure(route
, link
, ndisc_netlink_handler
);
105 log_link_warning_errno(link
, r
, "Could not set default route: %m");
106 link_enter_failed(link
);
110 link
->ndisc_messages
++;
113 static void ndisc_router_process_autonomous_prefix(Link
*link
, sd_ndisc_router
*rt
) {
114 _cleanup_address_free_ Address
*address
= NULL
;
115 uint32_t lifetime_valid
, lifetime_preferred
;
122 r
= sd_ndisc_router_prefix_get_prefixlen(rt
, &prefixlen
);
124 log_link_error_errno(link
, r
, "Failed to get prefix length: %m");
128 r
= sd_ndisc_router_prefix_get_valid_lifetime(rt
, &lifetime_valid
);
130 log_link_error_errno(link
, r
, "Failed to get prefix valid lifetime: %m");
134 r
= sd_ndisc_router_prefix_get_preferred_lifetime(rt
, &lifetime_preferred
);
136 log_link_error_errno(link
, r
, "Failed to get prefix preferred lifetime: %m");
140 r
= address_new(&address
);
142 log_link_error_errno(link
, r
, "Could not allocate address: %m");
146 address
->family
= AF_INET6
;
147 r
= sd_ndisc_router_prefix_get_address(rt
, &address
->in_addr
.in6
);
149 log_link_error_errno(link
, r
, "Failed to get prefix address: %m");
153 if (in_addr_is_null(AF_INET6
, (const union in_addr_union
*) &link
->network
->ipv6_token
) == 0)
154 memcpy(((char *)&address
->in_addr
.in6
) + 8, ((char *)&link
->network
->ipv6_token
) + 8, 8);
156 /* see RFC4291 section 2.5.1 */
157 address
->in_addr
.in6
.s6_addr
[8] = link
->mac
.ether_addr_octet
[0];
158 address
->in_addr
.in6
.s6_addr
[8] ^= 1 << 1;
159 address
->in_addr
.in6
.s6_addr
[9] = link
->mac
.ether_addr_octet
[1];
160 address
->in_addr
.in6
.s6_addr
[10] = link
->mac
.ether_addr_octet
[2];
161 address
->in_addr
.in6
.s6_addr
[11] = 0xff;
162 address
->in_addr
.in6
.s6_addr
[12] = 0xfe;
163 address
->in_addr
.in6
.s6_addr
[13] = link
->mac
.ether_addr_octet
[3];
164 address
->in_addr
.in6
.s6_addr
[14] = link
->mac
.ether_addr_octet
[4];
165 address
->in_addr
.in6
.s6_addr
[15] = link
->mac
.ether_addr_octet
[5];
167 address
->prefixlen
= prefixlen
;
168 address
->flags
= IFA_F_NOPREFIXROUTE
|IFA_F_MANAGETEMPADDR
;
169 address
->cinfo
.ifa_prefered
= lifetime_preferred
;
170 address
->cinfo
.ifa_valid
= lifetime_valid
;
172 r
= address_configure(address
, link
, ndisc_netlink_handler
, true);
174 log_link_warning_errno(link
, r
, "Could not set SLAAC address: %m");
175 link_enter_failed(link
);
179 link
->ndisc_messages
++;
182 static void ndisc_router_process_onlink_prefix(Link
*link
, sd_ndisc_router
*rt
) {
183 _cleanup_route_free_ Route
*route
= NULL
;
192 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), &time_now
);
194 log_link_warning_errno(link
, r
, "Failed to get RA timestamp: %m");
198 r
= sd_ndisc_router_prefix_get_prefixlen(rt
, &prefixlen
);
200 log_link_error_errno(link
, r
, "Failed to get prefix length: %m");
204 r
= sd_ndisc_router_prefix_get_valid_lifetime(rt
, &lifetime
);
206 log_link_error_errno(link
, r
, "Failed to get prefix lifetime: %m");
210 r
= route_new(&route
);
212 log_link_error_errno(link
, r
, "Could not allocate route: %m");
216 route
->family
= AF_INET6
;
217 route
->table
= RT_TABLE_MAIN
;
218 route
->protocol
= RTPROT_RA
;
219 route
->flags
= RTM_F_PREFIX
;
220 route
->dst_prefixlen
= prefixlen
;
221 route
->lifetime
= time_now
+ lifetime
* USEC_PER_SEC
;
223 r
= sd_ndisc_router_prefix_get_address(rt
, &route
->dst
.in6
);
225 log_link_error_errno(link
, r
, "Failed to get prefix address: %m");
229 r
= route_configure(route
, link
, ndisc_netlink_handler
);
231 log_link_warning_errno(link
, r
, "Could not set prefix route: %m");
232 link_enter_failed(link
);
236 link
->ndisc_messages
++;
239 static void ndisc_router_process_route(Link
*link
, sd_ndisc_router
*rt
) {
240 _cleanup_route_free_ Route
*route
= NULL
;
241 struct in6_addr gateway
;
243 unsigned preference
, prefixlen
;
249 r
= sd_ndisc_router_route_get_lifetime(rt
, &lifetime
);
251 log_link_warning_errno(link
, r
, "Failed to get gateway address from RA: %m");
257 r
= sd_ndisc_router_get_address(rt
, &gateway
);
259 log_link_warning_errno(link
, r
, "Failed to get gateway address from RA: %m");
263 r
= sd_ndisc_router_route_get_prefixlen(rt
, &prefixlen
);
265 log_link_warning_errno(link
, r
, "Failed to get route prefix length: %m");
269 r
= sd_ndisc_router_route_get_preference(rt
, &preference
);
271 log_link_warning_errno(link
, r
, "Failed to get default router preference from RA: %m");
275 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), &time_now
);
277 log_link_warning_errno(link
, r
, "Failed to get RA timestamp: %m");
281 r
= route_new(&route
);
283 log_link_error_errno(link
, r
, "Could not allocate route: %m");
287 route
->family
= AF_INET6
;
288 route
->table
= RT_TABLE_MAIN
;
289 route
->protocol
= RTPROT_RA
;
290 route
->pref
= preference
;
291 route
->gw
.in6
= gateway
;
292 route
->dst_prefixlen
= prefixlen
;
293 route
->lifetime
= time_now
+ lifetime
* USEC_PER_SEC
;
295 r
= sd_ndisc_router_route_get_address(rt
, &route
->dst
.in6
);
297 log_link_error_errno(link
, r
, "Failed to get route address: %m");
301 r
= route_configure(route
, link
, ndisc_netlink_handler
);
303 log_link_warning_errno(link
, r
, "Could not set additional route: %m");
304 link_enter_failed(link
);
308 link
->ndisc_messages
++;
311 static void ndisc_rdnss_hash_func(const void *p
, struct siphash
*state
) {
312 const NDiscRDNSS
*x
= p
;
314 siphash24_compress(&x
->address
, sizeof(x
->address
), state
);
317 static int ndisc_rdnss_compare_func(const void *_a
, const void *_b
) {
318 const NDiscRDNSS
*a
= _a
, *b
= _b
;
320 return memcmp(&a
->address
, &b
->address
, sizeof(a
->address
));
323 static const struct hash_ops ndisc_rdnss_hash_ops
= {
324 .hash
= ndisc_rdnss_hash_func
,
325 .compare
= ndisc_rdnss_compare_func
328 static void ndisc_router_process_rdnss(Link
*link
, sd_ndisc_router
*rt
) {
330 const struct in6_addr
*a
;
337 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), &time_now
);
339 log_link_warning_errno(link
, r
, "Failed to get RA timestamp: %m");
343 r
= sd_ndisc_router_rdnss_get_lifetime(rt
, &lifetime
);
345 log_link_warning_errno(link
, r
, "Failed to get RDNSS lifetime: %m");
349 n
= sd_ndisc_router_rdnss_get_addresses(rt
, &a
);
351 log_link_warning_errno(link
, n
, "Failed to get RDNSS addresses: %m");
355 for (i
= 0; i
< n
; i
++) {
361 (void) set_remove(link
->ndisc_rdnss
, &d
);
366 x
= set_get(link
->ndisc_rdnss
, &d
);
368 x
->valid_until
= time_now
+ lifetime
* USEC_PER_SEC
;
374 if (set_size(link
->ndisc_rdnss
) >= NDISC_RDNSS_MAX
) {
375 log_link_warning(link
, "Too many RDNSS records per link, ignoring.");
379 r
= set_ensure_allocated(&link
->ndisc_rdnss
, &ndisc_rdnss_hash_ops
);
385 x
= new0(NDiscRDNSS
, 1);
392 x
->valid_until
= time_now
+ lifetime
* USEC_PER_SEC
;
394 r
= set_put(link
->ndisc_rdnss
, x
);
406 static void ndisc_dnssl_hash_func(const void *p
, struct siphash
*state
) {
407 const NDiscDNSSL
*x
= p
;
409 siphash24_compress(NDISC_DNSSL_DOMAIN(x
), strlen(NDISC_DNSSL_DOMAIN(x
)), state
);
412 static int ndisc_dnssl_compare_func(const void *_a
, const void *_b
) {
413 const NDiscDNSSL
*a
= _a
, *b
= _b
;
415 return strcmp(NDISC_DNSSL_DOMAIN(a
), NDISC_DNSSL_DOMAIN(b
));
418 static const struct hash_ops ndisc_dnssl_hash_ops
= {
419 .hash
= ndisc_dnssl_hash_func
,
420 .compare
= ndisc_dnssl_compare_func
423 static void ndisc_router_process_dnssl(Link
*link
, sd_ndisc_router
*rt
) {
424 _cleanup_strv_free_
char **l
= NULL
;
433 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), &time_now
);
435 log_link_warning_errno(link
, r
, "Failed to get RA timestamp: %m");
439 r
= sd_ndisc_router_dnssl_get_lifetime(rt
, &lifetime
);
441 log_link_warning_errno(link
, r
, "Failed to get RDNSS lifetime: %m");
445 r
= sd_ndisc_router_dnssl_get_domains(rt
, &l
);
447 log_link_warning_errno(link
, r
, "Failed to get RDNSS addresses: %m");
454 char domain
[strlen(*i
)];
459 strcpy(s
.domain
, *i
);
462 (void) set_remove(link
->ndisc_dnssl
, &s
);
467 x
= set_get(link
->ndisc_dnssl
, &s
);
469 x
->valid_until
= time_now
+ lifetime
* USEC_PER_SEC
;
475 if (set_size(link
->ndisc_dnssl
) >= NDISC_DNSSL_MAX
) {
476 log_link_warning(link
, "Too many DNSSL records per link, ignoring.");
480 r
= set_ensure_allocated(&link
->ndisc_dnssl
, &ndisc_dnssl_hash_ops
);
486 x
= malloc0(ALIGN(sizeof(NDiscDNSSL
)) + strlen(*i
) + 1);
492 strcpy(NDISC_DNSSL_DOMAIN(x
), *i
);
493 x
->valid_until
= time_now
+ lifetime
* USEC_PER_SEC
;
495 r
= set_put(link
->ndisc_dnssl
, x
);
507 static void ndisc_router_process_options(Link
*link
, sd_ndisc_router
*rt
) {
513 r
= sd_ndisc_router_option_rewind(rt
);
518 log_link_warning_errno(link
, r
, "Failed to iterate through options: %m");
521 if (r
== 0) /* EOF */
524 r
= sd_ndisc_router_option_get_type(rt
, &type
);
526 log_link_warning_errno(link
, r
, "Failed to get RA option type: %m");
532 case SD_NDISC_OPTION_PREFIX_INFORMATION
: {
535 r
= sd_ndisc_router_prefix_get_flags(rt
, &flags
);
537 log_link_warning_errno(link
, r
, "Failed to get RA prefix flags: %m");
541 if (flags
& ND_OPT_PI_FLAG_ONLINK
)
542 ndisc_router_process_onlink_prefix(link
, rt
);
543 if (flags
& ND_OPT_PI_FLAG_AUTO
)
544 ndisc_router_process_autonomous_prefix(link
, rt
);
549 case SD_NDISC_OPTION_ROUTE_INFORMATION
:
550 ndisc_router_process_route(link
, rt
);
553 case SD_NDISC_OPTION_RDNSS
:
554 ndisc_router_process_rdnss(link
, rt
);
557 case SD_NDISC_OPTION_DNSSL
:
558 ndisc_router_process_dnssl(link
, rt
);
562 r
= sd_ndisc_router_option_next(rt
);
566 static void ndisc_router_handler(Link
*link
, sd_ndisc_router
*rt
) {
571 assert(link
->network
);
572 assert(link
->manager
);
575 r
= sd_ndisc_router_get_flags(rt
, &flags
);
577 log_link_warning_errno(link
, r
, "Failed to get RA flags: %m");
581 if (flags
& (ND_RA_FLAG_MANAGED
| ND_RA_FLAG_OTHER
)) {
582 /* (re)start DHCPv6 client in stateful or stateless mode according to RA flags */
583 r
= dhcp6_request_address(link
, !(flags
& ND_RA_FLAG_MANAGED
));
584 if (r
< 0 && r
!= -EBUSY
)
585 log_link_warning_errno(link
, r
, "Could not acquire DHCPv6 lease on NDisc request: %m");
587 log_link_debug(link
, "Acquiring DHCPv6 lease on NDisc request");
590 ndisc_router_process_default(link
, rt
);
591 ndisc_router_process_options(link
, rt
);
594 static void ndisc_handler(sd_ndisc
*nd
, sd_ndisc_event event
, sd_ndisc_router
*rt
, void *userdata
) {
595 Link
*link
= userdata
;
599 if (IN_SET(link
->state
, LINK_STATE_FAILED
, LINK_STATE_LINGER
))
604 case SD_NDISC_EVENT_ROUTER
:
605 ndisc_router_handler(link
, rt
);
608 case SD_NDISC_EVENT_TIMEOUT
:
609 link
->ndisc_configured
= true;
610 link_check_ready(link
);
614 log_link_warning(link
, "IPv6 Neighbor Discovery unknown event: %d", event
);
618 int ndisc_configure(Link
*link
) {
623 r
= sd_ndisc_new(&link
->ndisc
);
627 r
= sd_ndisc_attach_event(link
->ndisc
, NULL
, 0);
631 r
= sd_ndisc_set_mac(link
->ndisc
, &link
->mac
);
635 r
= sd_ndisc_set_ifindex(link
->ndisc
, link
->ifindex
);
639 r
= sd_ndisc_set_callback(link
->ndisc
, ndisc_handler
, link
);
646 void ndisc_vacuum(Link
*link
) {
654 /* Removes all RDNSS and DNSSL entries whose validity time has passed */
656 time_now
= now(clock_boottime_or_monotonic());
658 SET_FOREACH(r
, link
->ndisc_rdnss
, i
)
659 if (r
->valid_until
< time_now
) {
660 (void) set_remove(link
->ndisc_rdnss
, r
);
664 SET_FOREACH(d
, link
->ndisc_dnssl
, i
)
665 if (d
->valid_until
< time_now
) {
666 (void) set_remove(link
->ndisc_dnssl
, d
);