1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 Copyright © 2014 Intel Corporation. All rights reserved.
6 #include <netinet/ether.h>
10 #include "sd-dhcp6-client.h"
13 #include "hostname-util.h"
14 #include "network-internal.h"
15 #include "networkd-link.h"
16 #include "networkd-manager.h"
17 #include "siphash24.h"
18 #include "string-util.h"
19 #include "radv-internal.h"
21 static int dhcp6_lease_address_acquired(sd_dhcp6_client
*client
, Link
*link
);
23 static bool dhcp6_verify_link(Link
*link
) {
25 log_link_info(link
, "Link is not managed by us");
29 if (!IN_SET(link
->network
->router_prefix_delegation
,
30 RADV_PREFIX_DELEGATION_DHCP6
,
31 RADV_PREFIX_DELEGATION_BOTH
)) {
32 log_link_debug(link
, "Link does not request DHCPv6 prefix delegation");
39 static bool dhcp6_enable_prefix_delegation(Link
*dhcp6_link
) {
46 manager
= dhcp6_link
->manager
;
49 HASHMAP_FOREACH(l
, manager
->links
, i
) {
53 if (!dhcp6_verify_link(l
))
62 static int dhcp6_lease_information_acquired(sd_dhcp6_client
*client
,
67 static int dhcp6_pd_prefix_assign(Link
*link
, struct in6_addr
*prefix
,
69 uint32_t lifetime_preferred
,
70 uint32_t lifetime_valid
) {
71 sd_radv
*radv
= link
->radv
;
73 _cleanup_(sd_radv_prefix_unrefp
) sd_radv_prefix
*p
= NULL
;
75 r
= sd_radv_prefix_new(&p
);
79 r
= sd_radv_prefix_set_prefix(p
, prefix
, prefix_len
);
83 r
= sd_radv_prefix_set_preferred_lifetime(p
, lifetime_preferred
);
87 r
= sd_radv_prefix_set_valid_lifetime(p
, lifetime_valid
);
91 r
= sd_radv_stop(radv
);
95 r
= sd_radv_add_prefix(radv
, p
, true);
96 if (r
< 0 && r
!= -EEXIST
)
99 r
= manager_dhcp6_prefix_add(link
->manager
, &p
->opt
.in6_addr
, link
);
103 return sd_radv_start(radv
);
106 static Network
*dhcp6_reset_pd_prefix_network(Link
*link
) {
108 assert(link
->manager
);
109 assert(link
->manager
->networks
);
111 return link
->manager
->networks
;
114 static int dhcp6_pd_prefix_distribute(Link
*dhcp6_link
, Iterator
*i
,
115 struct in6_addr
*pd_prefix
,
116 uint8_t pd_prefix_len
,
117 uint32_t lifetime_preferred
,
118 uint32_t lifetime_valid
) {
120 Manager
*manager
= dhcp6_link
->manager
;
121 union in_addr_union prefix
;
122 uint64_t n_prefixes
, n_used
= 0;
123 _cleanup_free_
char *buf
= NULL
;
127 assert(pd_prefix_len
<= 64);
129 prefix
.in6
= *pd_prefix
;
131 r
= in_addr_mask(AF_INET6
, &prefix
, pd_prefix_len
);
135 n_prefixes
= UINT64_C(1) << (64 - pd_prefix_len
);
137 (void) in_addr_to_string(AF_INET6
, &prefix
, &buf
);
138 log_link_debug(dhcp6_link
, "Assigning up to %" PRIu64
" prefixes from %s/%u",
139 n_prefixes
, strnull(buf
), pd_prefix_len
);
141 while (hashmap_iterate(manager
->links
, i
, (void **)&link
, NULL
)) {
144 if (n_used
== n_prefixes
) {
145 log_link_debug(dhcp6_link
, "Assigned %" PRIu64
"/%" PRIu64
" prefixes from %s/%u",
146 n_used
, n_prefixes
, strnull(buf
), pd_prefix_len
);
151 if (link
== dhcp6_link
)
154 if (!dhcp6_verify_link(link
))
157 assigned_link
= manager_dhcp6_prefix_get(manager
, &prefix
.in6
);
158 if (assigned_link
!= NULL
&& assigned_link
!= link
)
161 r
= dhcp6_pd_prefix_assign(link
, &prefix
.in6
, 64,
162 lifetime_preferred
, lifetime_valid
);
164 log_link_error_errno(link
, r
, "Unable to %s prefix %s/%u for link: %m",
165 assigned_link
? "update": "assign",
166 strnull(buf
), pd_prefix_len
);
168 if (assigned_link
== NULL
)
172 log_link_debug(link
, "Assigned prefix %" PRIu64
"/%" PRIu64
" %s/64 to link",
173 n_used
+ 1, n_prefixes
, strnull(buf
));
177 r
= in_addr_prefix_next(AF_INET6
, &prefix
, 64);
178 if (r
< 0 && n_used
< n_prefixes
)
182 if (n_used
< n_prefixes
) {
186 r
= route_new(&route
);
190 route
->family
= AF_INET6
;
192 while (n
< n_prefixes
) {
193 route_update(route
, &prefix
, pd_prefix_len
, NULL
, NULL
,
194 0, 0, RTN_UNREACHABLE
);
196 r
= route_configure(route
, dhcp6_link
, NULL
);
202 r
= in_addr_prefix_next(AF_INET6
, &prefix
, pd_prefix_len
);
211 static int dhcp6_lease_pd_prefix_acquired(sd_dhcp6_client
*client
, Link
*link
) {
213 sd_dhcp6_lease
*lease
;
214 struct in6_addr pd_prefix
;
215 uint8_t pd_prefix_len
;
216 uint32_t lifetime_preferred
, lifetime_valid
;
217 _cleanup_free_
char *buf
= NULL
;
218 Iterator i
= ITERATOR_FIRST
;
220 r
= sd_dhcp6_client_get_lease(client
, &lease
);
224 dhcp6_reset_pd_prefix_network(link
);
225 sd_dhcp6_lease_reset_pd_prefix_iter(lease
);
227 while (sd_dhcp6_lease_get_pd(lease
, &pd_prefix
, &pd_prefix_len
,
229 &lifetime_valid
) >= 0) {
231 if (pd_prefix_len
> 64) {
232 (void) in_addr_to_string(AF_INET6
, (union in_addr_union
*) &pd_prefix
, &buf
);
233 log_link_debug(link
, "PD Prefix length > 64, ignoring prefix %s/%u",
234 strnull(buf
), pd_prefix_len
);
238 if (pd_prefix_len
< 48) {
239 (void) in_addr_to_string(AF_INET6
, (union in_addr_union
*) &pd_prefix
, &buf
);
240 log_link_warning(link
, "PD Prefix length < 48, looks unusual %s/%u",
241 strnull(buf
), pd_prefix_len
);
244 r
= dhcp6_pd_prefix_distribute(link
, &i
, &pd_prefix
,
248 if (r
< 0 && r
!= -EAGAIN
)
258 static int dhcp6_address_handler(sd_netlink
*rtnl
, sd_netlink_message
*m
,
260 _cleanup_(link_unrefp
) Link
*link
= userdata
;
265 r
= sd_netlink_message_get_errno(m
);
266 if (r
< 0 && r
!= -EEXIST
) {
267 if (link
->rtnl_extended_attrs
) {
268 log_link_warning(link
, "Could not set extended netlink attributes, reverting to fallback mechanism");
270 link
->rtnl_extended_attrs
= false;
271 dhcp6_lease_address_acquired(link
->dhcp6_client
, link
);
276 log_link_error_errno(link
, r
, "Could not set DHCPv6 address: %m");
278 link_enter_failed(link
);
281 manager_rtnl_process_address(rtnl
, m
, link
->manager
);
286 static int dhcp6_address_change(
288 struct in6_addr
*ip6_addr
,
289 uint32_t lifetime_preferred
,
290 uint32_t lifetime_valid
) {
292 _cleanup_(address_freep
) Address
*addr
= NULL
;
293 char buffer
[INET6_ADDRSTRLEN
];
296 r
= address_new(&addr
);
300 addr
->family
= AF_INET6
;
301 memcpy(&addr
->in_addr
.in6
, ip6_addr
, sizeof(*ip6_addr
));
303 addr
->flags
= IFA_F_NOPREFIXROUTE
;
304 addr
->prefixlen
= 128;
306 addr
->cinfo
.ifa_prefered
= lifetime_preferred
;
307 addr
->cinfo
.ifa_valid
= lifetime_valid
;
310 "DHCPv6 address %s/%d timeout preferred %d valid %d",
311 inet_ntop(AF_INET6
, &addr
->in_addr
.in6
, buffer
, sizeof(buffer
)),
312 addr
->prefixlen
, lifetime_preferred
, lifetime_valid
);
314 r
= address_configure(addr
, link
, dhcp6_address_handler
, true);
316 log_link_warning_errno(link
, r
, "Could not assign DHCPv6 address: %m");
321 static int dhcp6_lease_address_acquired(sd_dhcp6_client
*client
, Link
*link
) {
323 sd_dhcp6_lease
*lease
;
324 struct in6_addr ip6_addr
;
325 uint32_t lifetime_preferred
, lifetime_valid
;
327 r
= sd_dhcp6_client_get_lease(client
, &lease
);
331 sd_dhcp6_lease_reset_address_iter(lease
);
333 while (sd_dhcp6_lease_get_address(lease
, &ip6_addr
,
335 &lifetime_valid
) >= 0) {
337 r
= dhcp6_address_change(link
, &ip6_addr
, lifetime_preferred
, lifetime_valid
);
345 static void dhcp6_handler(sd_dhcp6_client
*client
, int event
, void *userdata
) {
347 Link
*link
= userdata
;
350 assert(link
->network
);
352 if (IN_SET(link
->state
, LINK_STATE_FAILED
, LINK_STATE_LINGER
))
356 case SD_DHCP6_CLIENT_EVENT_STOP
:
357 case SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE
:
358 case SD_DHCP6_CLIENT_EVENT_RETRANS_MAX
:
359 if (sd_dhcp6_client_get_lease(client
, NULL
) >= 0)
360 log_link_warning(link
, "DHCPv6 lease lost");
362 (void) manager_dhcp6_prefix_remove_all(link
->manager
, link
);
364 link
->dhcp6_configured
= false;
367 case SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE
:
368 r
= dhcp6_lease_address_acquired(client
, link
);
370 link_enter_failed(link
);
374 r
= dhcp6_lease_pd_prefix_acquired(client
, link
);
376 log_link_debug(link
, "DHCPv6 did not receive prefixes to delegate");
379 case SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST
:
380 r
= dhcp6_lease_information_acquired(client
, link
);
382 link_enter_failed(link
);
386 link
->dhcp6_configured
= true;
391 log_link_warning_errno(link
, event
, "DHCPv6 error: %m");
393 log_link_warning(link
, "DHCPv6 unknown event: %d", event
);
397 link_check_ready(link
);
400 int dhcp6_request_address(Link
*link
, int ir
) {
405 assert(link
->dhcp6_client
);
406 assert(in_addr_is_link_local(AF_INET6
, (const union in_addr_union
*)&link
->ipv6ll_address
) > 0);
408 r
= sd_dhcp6_client_is_running(link
->dhcp6_client
);
415 r
= sd_dhcp6_client_get_information_request(link
->dhcp6_client
, &inf_req
);
422 r
= sd_dhcp6_client_stop(link
->dhcp6_client
);
426 r
= sd_dhcp6_client_set_local_address(link
->dhcp6_client
, &link
->ipv6ll_address
);
431 r
= sd_dhcp6_client_set_information_request(link
->dhcp6_client
, ir
);
435 r
= sd_dhcp6_client_start(link
->dhcp6_client
);
442 static int dhcp6_set_hostname(sd_dhcp6_client
*client
, Link
*link
) {
443 _cleanup_free_
char *hostname
= NULL
;
449 if (!link
->network
->dhcp_send_hostname
)
451 else if (link
->network
->dhcp_hostname
)
452 hn
= link
->network
->dhcp_hostname
;
454 r
= gethostname_strict(&hostname
);
455 if (r
< 0 && r
!= -ENXIO
) /* ENXIO: no hostname set or hostname is "localhost" */
461 r
= sd_dhcp6_client_set_fqdn(client
, hn
);
462 if (r
== -EINVAL
&& hostname
)
463 /* Ignore error when the machine's hostname is not suitable to send in DHCP packet. */
464 log_link_warning_errno(link
, r
, "DHCP6 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m");
466 return log_link_error_errno(link
, r
, "DHCP6 CLIENT: Failed to set hostname: %m");
471 int dhcp6_configure(Link
*link
) {
472 _cleanup_(sd_dhcp6_client_unrefp
) sd_dhcp6_client
*client
= NULL
;
477 assert(link
->network
);
479 if (link
->dhcp6_client
)
482 r
= sd_dhcp6_client_new(&client
);
486 return log_link_error_errno(link
, r
, "DHCP6 CLIENT: Failed to create DHCP6 client: %m");
488 r
= sd_dhcp6_client_attach_event(client
, NULL
, 0);
490 return log_link_error_errno(link
, r
, "DHCP6 CLIENT: Failed to attach event: %m");
492 r
= sd_dhcp6_client_set_mac(client
,
493 (const uint8_t *) &link
->mac
,
494 sizeof (link
->mac
), ARPHRD_ETHER
);
496 return log_link_error_errno(link
, r
, "DHCP6 CLIENT: Failed to set MAC address: %m");
498 r
= sd_dhcp6_client_set_iaid(client
, link
->network
->iaid
);
500 return log_link_error_errno(link
, r
, "DHCP6 CLIENT: Failed to set IAID: %m");
502 duid
= link_get_duid(link
);
503 if (duid
->type
== DUID_TYPE_LLT
&& duid
->raw_data_len
== 0)
504 r
= sd_dhcp6_client_set_duid_llt(client
, duid
->llt_time
);
506 r
= sd_dhcp6_client_set_duid(client
,
508 duid
->raw_data_len
> 0 ? duid
->raw_data
: NULL
,
511 return log_link_error_errno(link
, r
, "DHCP6 CLIENT: Failed to set DUID: %m");
513 r
= dhcp6_set_hostname(client
, link
);
517 r
= sd_dhcp6_client_set_ifindex(client
, link
->ifindex
);
519 return log_link_error_errno(link
, r
, "DHCP6 CLIENT: Failed to set ifindex: %m");
521 if (link
->network
->rapid_commit
) {
522 r
= sd_dhcp6_client_set_request_option(client
, SD_DHCP6_OPTION_RAPID_COMMIT
);
524 return log_link_error_errno(link
, r
, "DHCP6 CLIENT: Failed to set request flag for rapid commit: %m");
527 r
= sd_dhcp6_client_set_callback(client
, dhcp6_handler
, link
);
529 return log_link_error_errno(link
, r
, "DHCP6 CLIENT: Failed to set callback: %m");
531 if (dhcp6_enable_prefix_delegation(link
)) {
532 r
= sd_dhcp6_client_set_prefix_delegation(client
, true);
534 return log_link_error_errno(link
, r
, "DHCP6 CLIENT: Failed to set prefix delegation: %m");
537 link
->dhcp6_client
= TAKE_PTR(client
);