1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 Copyright © 2014 Intel Corporation. All rights reserved.
6 #include <netinet/icmp6.h>
11 #include "missing_network.h"
12 #include "networkd-ndisc.h"
13 #include "networkd-route.h"
16 #define NDISC_DNSSL_MAX 64U
17 #define NDISC_RDNSS_MAX 64U
18 #define NDISC_PREFIX_LFT_MIN 7200U
20 static int ndisc_netlink_message_handler(sd_netlink
*rtnl
, sd_netlink_message
*m
, Link
*link
) {
24 assert(link
->ndisc_messages
> 0);
26 link
->ndisc_messages
--;
28 r
= sd_netlink_message_get_errno(m
);
29 if (r
< 0 && r
!= -EEXIST
)
30 log_link_error_errno(link
, r
, "Could not set NDisc route or address: %m");
32 if (link
->ndisc_messages
== 0) {
33 link
->ndisc_configured
= true;
34 link_check_ready(link
);
40 static int ndisc_router_process_default(Link
*link
, sd_ndisc_router
*rt
) {
41 _cleanup_(route_freep
) Route
*route
= NULL
;
42 struct in6_addr gateway
;
54 r
= sd_ndisc_router_get_lifetime(rt
, &lifetime
);
56 return log_link_warning_errno(link
, r
, "Failed to get gateway address from RA: %m");
58 if (lifetime
== 0) /* not a default router */
61 r
= sd_ndisc_router_get_address(rt
, &gateway
);
63 return log_link_warning_errno(link
, r
, "Failed to get gateway address from RA: %m");
65 SET_FOREACH(address
, link
->addresses
, i
)
66 if (!memcmp(&gateway
, &address
->in_addr
.in6
, sizeof(address
->in_addr
.in6
))) {
67 char buffer
[INET6_ADDRSTRLEN
];
69 log_link_debug(link
, "No NDisc route added, gateway %s matches local address",
71 &address
->in_addr
.in6
,
72 buffer
, sizeof(buffer
)));
76 SET_FOREACH(address
, link
->addresses_foreign
, i
)
77 if (!memcmp(&gateway
, &address
->in_addr
.in6
, sizeof(address
->in_addr
.in6
))) {
78 char buffer
[INET6_ADDRSTRLEN
];
80 log_link_debug(link
, "No NDisc route added, gateway %s matches local address",
82 &address
->in_addr
.in6
,
83 buffer
, sizeof(buffer
)));
87 r
= sd_ndisc_router_get_preference(rt
, &preference
);
89 return log_link_warning_errno(link
, r
, "Failed to get default router preference from RA: %m");
91 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), &time_now
);
93 return log_link_warning_errno(link
, r
, "Failed to get RA timestamp: %m");
95 r
= sd_ndisc_router_get_mtu(rt
, &mtu
);
99 return log_link_warning_errno(link
, r
, "Failed to get default router MTU from RA: %m");
101 r
= route_new(&route
);
103 return log_link_error_errno(link
, r
, "Could not allocate route: %m");
105 route
->family
= AF_INET6
;
106 route
->table
= link_get_ipv6_accept_ra_route_table(link
);
107 route
->priority
= link
->network
->dhcp_route_metric
;
108 route
->protocol
= RTPROT_RA
;
109 route
->pref
= preference
;
110 route
->gw
.in6
= gateway
;
111 route
->lifetime
= time_now
+ lifetime
* USEC_PER_SEC
;
114 r
= route_configure(route
, link
, ndisc_netlink_message_handler
);
116 log_link_warning_errno(link
, r
, "Could not set default route: %m");
117 link_enter_failed(link
);
121 link
->ndisc_messages
++;
126 static int ndisc_router_process_autonomous_prefix(Link
*link
, sd_ndisc_router
*rt
) {
127 _cleanup_(address_freep
) Address
*address
= NULL
;
128 Address
*existing_address
;
129 uint32_t lifetime_valid
, lifetime_preferred
, lifetime_remaining
;
137 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), &time_now
);
139 return log_link_warning_errno(link
, r
, "Failed to get RA timestamp: %m");
141 r
= sd_ndisc_router_prefix_get_prefixlen(rt
, &prefixlen
);
143 return log_link_error_errno(link
, r
, "Failed to get prefix length: %m");
145 r
= sd_ndisc_router_prefix_get_valid_lifetime(rt
, &lifetime_valid
);
147 return log_link_error_errno(link
, r
, "Failed to get prefix valid lifetime: %m");
149 r
= sd_ndisc_router_prefix_get_preferred_lifetime(rt
, &lifetime_preferred
);
151 return log_link_error_errno(link
, r
, "Failed to get prefix preferred lifetime: %m");
153 /* The preferred lifetime is never greater than the valid lifetime */
154 if (lifetime_preferred
> lifetime_valid
)
157 r
= address_new(&address
);
159 return log_link_error_errno(link
, r
, "Could not allocate address: %m");
161 address
->family
= AF_INET6
;
162 r
= sd_ndisc_router_prefix_get_address(rt
, &address
->in_addr
.in6
);
164 return log_link_error_errno(link
, r
, "Failed to get prefix address: %m");
166 if (in_addr_is_null(AF_INET6
, (const union in_addr_union
*) &link
->network
->ipv6_token
) == 0)
167 memcpy(((char *)&address
->in_addr
.in6
) + 8, ((char *)&link
->network
->ipv6_token
) + 8, 8);
169 /* see RFC4291 section 2.5.1 */
170 address
->in_addr
.in6
.s6_addr
[8] = link
->mac
.ether_addr_octet
[0];
171 address
->in_addr
.in6
.s6_addr
[8] ^= 1 << 1;
172 address
->in_addr
.in6
.s6_addr
[9] = link
->mac
.ether_addr_octet
[1];
173 address
->in_addr
.in6
.s6_addr
[10] = link
->mac
.ether_addr_octet
[2];
174 address
->in_addr
.in6
.s6_addr
[11] = 0xff;
175 address
->in_addr
.in6
.s6_addr
[12] = 0xfe;
176 address
->in_addr
.in6
.s6_addr
[13] = link
->mac
.ether_addr_octet
[3];
177 address
->in_addr
.in6
.s6_addr
[14] = link
->mac
.ether_addr_octet
[4];
178 address
->in_addr
.in6
.s6_addr
[15] = link
->mac
.ether_addr_octet
[5];
180 address
->prefixlen
= prefixlen
;
181 address
->flags
= IFA_F_NOPREFIXROUTE
|IFA_F_MANAGETEMPADDR
;
182 address
->cinfo
.ifa_prefered
= lifetime_preferred
;
184 /* see RFC4862 section 5.5.3.e */
185 r
= address_get(link
, address
->family
, &address
->in_addr
, address
->prefixlen
, &existing_address
);
187 lifetime_remaining
= existing_address
->cinfo
.tstamp
/ 100 + existing_address
->cinfo
.ifa_valid
- time_now
/ USEC_PER_SEC
;
188 if (lifetime_valid
> NDISC_PREFIX_LFT_MIN
|| lifetime_valid
> lifetime_remaining
)
189 address
->cinfo
.ifa_valid
= lifetime_valid
;
190 else if (lifetime_remaining
<= NDISC_PREFIX_LFT_MIN
)
191 address
->cinfo
.ifa_valid
= lifetime_remaining
;
193 address
->cinfo
.ifa_valid
= NDISC_PREFIX_LFT_MIN
;
194 } else if (lifetime_valid
> 0)
195 address
->cinfo
.ifa_valid
= lifetime_valid
;
197 return 0; /* see RFC4862 section 5.5.3.d */
199 if (address
->cinfo
.ifa_valid
== 0)
202 r
= address_configure(address
, link
, ndisc_netlink_message_handler
, true);
204 log_link_warning_errno(link
, r
, "Could not set SLAAC address: %m");
205 link_enter_failed(link
);
209 link
->ndisc_messages
++;
214 static int ndisc_router_process_onlink_prefix(Link
*link
, sd_ndisc_router
*rt
) {
215 _cleanup_(route_freep
) Route
*route
= NULL
;
224 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), &time_now
);
226 return log_link_warning_errno(link
, r
, "Failed to get RA timestamp: %m");
228 r
= sd_ndisc_router_prefix_get_prefixlen(rt
, &prefixlen
);
230 return log_link_error_errno(link
, r
, "Failed to get prefix length: %m");
232 r
= sd_ndisc_router_prefix_get_valid_lifetime(rt
, &lifetime
);
234 return log_link_error_errno(link
, r
, "Failed to get prefix lifetime: %m");
236 r
= route_new(&route
);
238 return log_link_error_errno(link
, r
, "Could not allocate route: %m");
240 route
->family
= AF_INET6
;
241 route
->table
= link_get_ipv6_accept_ra_route_table(link
);
242 route
->priority
= link
->network
->dhcp_route_metric
;
243 route
->protocol
= RTPROT_RA
;
244 route
->flags
= RTM_F_PREFIX
;
245 route
->dst_prefixlen
= prefixlen
;
246 route
->lifetime
= time_now
+ lifetime
* USEC_PER_SEC
;
248 r
= sd_ndisc_router_prefix_get_address(rt
, &route
->dst
.in6
);
250 return log_link_error_errno(link
, r
, "Failed to get prefix address: %m");
252 r
= route_configure(route
, link
, ndisc_netlink_message_handler
);
254 log_link_warning_errno(link
, r
, "Could not set prefix route: %m");
255 link_enter_failed(link
);
259 link
->ndisc_messages
++;
264 static int ndisc_router_process_route(Link
*link
, sd_ndisc_router
*rt
) {
265 _cleanup_(route_freep
) Route
*route
= NULL
;
266 struct in6_addr gateway
;
268 unsigned preference
, prefixlen
;
274 r
= sd_ndisc_router_route_get_lifetime(rt
, &lifetime
);
276 return log_link_warning_errno(link
, r
, "Failed to get gateway address from RA: %m");
281 r
= sd_ndisc_router_get_address(rt
, &gateway
);
283 return log_link_warning_errno(link
, r
, "Failed to get gateway address from RA: %m");
285 r
= sd_ndisc_router_route_get_prefixlen(rt
, &prefixlen
);
287 return log_link_warning_errno(link
, r
, "Failed to get route prefix length: %m");
289 r
= sd_ndisc_router_route_get_preference(rt
, &preference
);
291 return log_link_warning_errno(link
, r
, "Failed to get default router preference from RA: %m");
293 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), &time_now
);
295 return log_link_warning_errno(link
, r
, "Failed to get RA timestamp: %m");
297 r
= route_new(&route
);
299 return log_link_error_errno(link
, r
, "Could not allocate route: %m");
301 route
->family
= AF_INET6
;
302 route
->table
= link_get_ipv6_accept_ra_route_table(link
);
303 route
->protocol
= RTPROT_RA
;
304 route
->pref
= preference
;
305 route
->gw
.in6
= gateway
;
306 route
->dst_prefixlen
= prefixlen
;
307 route
->lifetime
= time_now
+ lifetime
* USEC_PER_SEC
;
309 r
= sd_ndisc_router_route_get_address(rt
, &route
->dst
.in6
);
311 return log_link_error_errno(link
, r
, "Failed to get route address: %m");
313 r
= route_configure(route
, link
, ndisc_netlink_message_handler
);
315 log_link_warning_errno(link
, r
, "Could not set additional route: %m");
316 link_enter_failed(link
);
320 link
->ndisc_messages
++;
325 static void ndisc_rdnss_hash_func(const NDiscRDNSS
*x
, struct siphash
*state
) {
326 siphash24_compress(&x
->address
, sizeof(x
->address
), state
);
329 static int ndisc_rdnss_compare_func(const NDiscRDNSS
*a
, const NDiscRDNSS
*b
) {
330 return memcmp(&a
->address
, &b
->address
, sizeof(a
->address
));
333 DEFINE_PRIVATE_HASH_OPS(ndisc_rdnss_hash_ops
, NDiscRDNSS
, ndisc_rdnss_hash_func
, ndisc_rdnss_compare_func
);
335 static int ndisc_router_process_rdnss(Link
*link
, sd_ndisc_router
*rt
) {
337 const struct in6_addr
*a
;
344 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), &time_now
);
346 return log_link_warning_errno(link
, r
, "Failed to get RA timestamp: %m");
348 r
= sd_ndisc_router_rdnss_get_lifetime(rt
, &lifetime
);
350 return log_link_warning_errno(link
, r
, "Failed to get RDNSS lifetime: %m");
352 n
= sd_ndisc_router_rdnss_get_addresses(rt
, &a
);
354 return log_link_warning_errno(link
, n
, "Failed to get RDNSS addresses: %m");
356 for (i
= 0; i
< n
; i
++) {
357 _cleanup_free_ NDiscRDNSS
*x
= NULL
;
363 (void) set_remove(link
->ndisc_rdnss
, &d
);
368 y
= set_get(link
->ndisc_rdnss
, &d
);
370 y
->valid_until
= time_now
+ lifetime
* USEC_PER_SEC
;
376 if (set_size(link
->ndisc_rdnss
) >= NDISC_RDNSS_MAX
) {
377 log_link_warning(link
, "Too many RDNSS records per link, ignoring.");
381 r
= set_ensure_allocated(&link
->ndisc_rdnss
, &ndisc_rdnss_hash_ops
);
385 x
= new(NDiscRDNSS
, 1);
391 .valid_until
= time_now
+ lifetime
* USEC_PER_SEC
,
394 r
= set_put(link
->ndisc_rdnss
, x
);
407 static void ndisc_dnssl_hash_func(const NDiscDNSSL
*x
, struct siphash
*state
) {
408 siphash24_compress(NDISC_DNSSL_DOMAIN(x
), strlen(NDISC_DNSSL_DOMAIN(x
)), state
);
411 static int ndisc_dnssl_compare_func(const NDiscDNSSL
*a
, const NDiscDNSSL
*b
) {
412 return strcmp(NDISC_DNSSL_DOMAIN(a
), NDISC_DNSSL_DOMAIN(b
));
415 DEFINE_PRIVATE_HASH_OPS(ndisc_dnssl_hash_ops
, NDiscDNSSL
, ndisc_dnssl_hash_func
, ndisc_dnssl_compare_func
);
417 static void ndisc_router_process_dnssl(Link
*link
, sd_ndisc_router
*rt
) {
418 _cleanup_strv_free_
char **l
= NULL
;
427 r
= sd_ndisc_router_get_timestamp(rt
, clock_boottime_or_monotonic(), &time_now
);
429 log_link_warning_errno(link
, r
, "Failed to get RA timestamp: %m");
433 r
= sd_ndisc_router_dnssl_get_lifetime(rt
, &lifetime
);
435 log_link_warning_errno(link
, r
, "Failed to get RDNSS lifetime: %m");
439 r
= sd_ndisc_router_dnssl_get_domains(rt
, &l
);
441 log_link_warning_errno(link
, r
, "Failed to get RDNSS addresses: %m");
446 _cleanup_free_ NDiscDNSSL
*s
;
449 s
= malloc0(ALIGN(sizeof(NDiscDNSSL
)) + strlen(*i
) + 1);
455 strcpy(NDISC_DNSSL_DOMAIN(s
), *i
);
458 (void) set_remove(link
->ndisc_dnssl
, s
);
463 x
= set_get(link
->ndisc_dnssl
, s
);
465 x
->valid_until
= time_now
+ lifetime
* USEC_PER_SEC
;
471 if (set_size(link
->ndisc_dnssl
) >= NDISC_DNSSL_MAX
) {
472 log_link_warning(link
, "Too many DNSSL records per link, ignoring.");
476 r
= set_ensure_allocated(&link
->ndisc_dnssl
, &ndisc_dnssl_hash_ops
);
482 s
->valid_until
= time_now
+ lifetime
* USEC_PER_SEC
;
484 r
= set_put(link
->ndisc_dnssl
, s
);
496 static int ndisc_router_process_options(Link
*link
, sd_ndisc_router
*rt
) {
502 r
= sd_ndisc_router_option_rewind(rt
);
507 return log_link_warning_errno(link
, r
, "Failed to iterate through options: %m");
508 if (r
== 0) /* EOF */
511 r
= sd_ndisc_router_option_get_type(rt
, &type
);
513 return log_link_warning_errno(link
, r
, "Failed to get RA option type: %m");
517 case SD_NDISC_OPTION_PREFIX_INFORMATION
: {
520 r
= sd_ndisc_router_prefix_get_flags(rt
, &flags
);
522 return log_link_warning_errno(link
, r
, "Failed to get RA prefix flags: %m");
524 if (link
->network
->ipv6_accept_ra_use_onlink_prefix
)
525 if (flags
& ND_OPT_PI_FLAG_ONLINK
)
526 (void) ndisc_router_process_onlink_prefix(link
, rt
);
528 if (link
->network
->ipv6_accept_ra_use_autonomous_prefix
)
529 if (flags
& ND_OPT_PI_FLAG_AUTO
)
530 (void) ndisc_router_process_autonomous_prefix(link
, rt
);
535 case SD_NDISC_OPTION_ROUTE_INFORMATION
:
536 (void) ndisc_router_process_route(link
, rt
);
539 case SD_NDISC_OPTION_RDNSS
:
540 if (link
->network
->ipv6_accept_ra_use_dns
)
541 (void) ndisc_router_process_rdnss(link
, rt
);
544 case SD_NDISC_OPTION_DNSSL
:
545 if (link
->network
->ipv6_accept_ra_use_dns
)
546 (void) ndisc_router_process_dnssl(link
, rt
);
550 r
= sd_ndisc_router_option_next(rt
);
556 static int ndisc_router_handler(Link
*link
, sd_ndisc_router
*rt
) {
561 assert(link
->network
);
562 assert(link
->manager
);
565 r
= sd_ndisc_router_get_flags(rt
, &flags
);
567 return log_link_warning_errno(link
, r
, "Failed to get RA flags: %m");
569 if (flags
& (ND_RA_FLAG_MANAGED
| ND_RA_FLAG_OTHER
)) {
570 /* (re)start DHCPv6 client in stateful or stateless mode according to RA flags */
571 r
= dhcp6_request_address(link
, !(flags
& ND_RA_FLAG_MANAGED
));
572 if (r
< 0 && r
!= -EBUSY
)
573 log_link_warning_errno(link
, r
, "Could not acquire DHCPv6 lease on NDisc request: %m");
575 log_link_debug(link
, "Acquiring DHCPv6 lease on NDisc request");
580 (void) ndisc_router_process_default(link
, rt
);
581 (void) ndisc_router_process_options(link
, rt
);
586 static void ndisc_handler(sd_ndisc
*nd
, sd_ndisc_event event
, sd_ndisc_router
*rt
, void *userdata
) {
587 Link
*link
= userdata
;
591 if (IN_SET(link
->state
, LINK_STATE_FAILED
, LINK_STATE_LINGER
))
596 case SD_NDISC_EVENT_ROUTER
:
597 (void) ndisc_router_handler(link
, rt
);
600 case SD_NDISC_EVENT_TIMEOUT
:
601 link
->ndisc_configured
= true;
602 link_check_ready(link
);
606 log_link_warning(link
, "IPv6 Neighbor Discovery unknown event: %d", event
);
610 int ndisc_configure(Link
*link
) {
615 r
= sd_ndisc_new(&link
->ndisc
);
619 r
= sd_ndisc_attach_event(link
->ndisc
, NULL
, 0);
623 r
= sd_ndisc_set_mac(link
->ndisc
, &link
->mac
);
627 r
= sd_ndisc_set_ifindex(link
->ndisc
, link
->ifindex
);
631 r
= sd_ndisc_set_callback(link
->ndisc
, ndisc_handler
, link
);
638 void ndisc_vacuum(Link
*link
) {
646 /* Removes all RDNSS and DNSSL entries whose validity time has passed */
648 time_now
= now(clock_boottime_or_monotonic());
650 SET_FOREACH(r
, link
->ndisc_rdnss
, i
)
651 if (r
->valid_until
< time_now
) {
652 free(set_remove(link
->ndisc_rdnss
, r
));
656 SET_FOREACH(d
, link
->ndisc_dnssl
, i
)
657 if (d
->valid_until
< time_now
) {
658 free(set_remove(link
->ndisc_dnssl
, d
));
663 void ndisc_flush(Link
*link
) {
666 /* Removes all RDNSS and DNSSL entries, without exception */
668 link
->ndisc_rdnss
= set_free_free(link
->ndisc_rdnss
);
669 link
->ndisc_dnssl
= set_free_free(link
->ndisc_dnssl
);