1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 #include <netinet/in.h>
6 #include "alloc-util.h"
7 #include "hostname-util.h"
8 #include "parse-util.h"
9 #include "network-internal.h"
10 #include "networkd-link.h"
11 #include "networkd-manager.h"
12 #include "networkd-network.h"
13 #include "string-util.h"
14 #include "sysctl-util.h"
16 static int dhcp4_route_handler(sd_netlink
*rtnl
, sd_netlink_message
*m
, Link
*link
) {
20 assert(link
->dhcp4_messages
> 0);
22 link
->dhcp4_messages
--;
24 r
= sd_netlink_message_get_errno(m
);
25 if (r
< 0 && r
!= -EEXIST
) {
26 log_link_error_errno(link
, r
, "Could not set DHCPv4 route: %m");
27 link_enter_failed(link
);
30 if (link
->dhcp4_messages
== 0) {
31 link
->dhcp4_configured
= true;
32 link_check_ready(link
);
38 static int route_scope_from_address(const Route
*route
, const struct in_addr
*self_addr
) {
42 if (in_addr_is_localhost(AF_INET
, &route
->dst
) ||
43 (self_addr
->s_addr
&& route
->dst
.in
.s_addr
== self_addr
->s_addr
))
45 else if (in4_addr_is_null(&route
->gw
.in
))
48 return RT_SCOPE_UNIVERSE
;
51 static int link_set_dhcp_routes(Link
*link
) {
52 _cleanup_free_ sd_dhcp_route
**static_routes
= NULL
;
53 bool classless_route
= false, static_route
= false;
54 const struct in_addr
*router
;
55 struct in_addr address
;
61 if (!link
->dhcp_lease
) /* link went down while we configured the IP addresses? */
64 if (!link
->network
) /* link went down while we configured the IP addresses? */
67 if (!link
->network
->dhcp_use_routes
)
70 table
= link_get_dhcp_route_table(link
);
72 r
= sd_dhcp_lease_get_address(link
->dhcp_lease
, &address
);
74 return log_link_warning_errno(link
, r
, "DHCP error: could not get address: %m");
76 n
= sd_dhcp_lease_get_routes(link
->dhcp_lease
, &static_routes
);
78 log_link_debug_errno(link
, n
, "DHCP: No routes received from DHCP server: %m");
80 log_link_debug_errno(link
, n
, "DHCP error: could not get routes: %m");
82 for (i
= 0; i
< n
; i
++) {
83 switch (sd_dhcp_route_get_option(static_routes
[i
])) {
84 case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE
:
85 classless_route
= true;
87 case SD_DHCP_OPTION_STATIC_ROUTE
:
93 for (i
= 0; i
< n
; i
++) {
94 _cleanup_(route_freep
) Route
*route
= NULL
;
96 /* if the DHCP server returns both a Classless Static Routes option and a Static Routes option,
97 the DHCP client MUST ignore the Static Routes option. */
98 if (classless_route
&&
99 sd_dhcp_route_get_option(static_routes
[i
]) != SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE
)
102 r
= route_new(&route
);
104 return log_link_error_errno(link
, r
, "Could not allocate route: %m");
106 route
->family
= AF_INET
;
107 route
->protocol
= RTPROT_DHCP
;
108 assert_se(sd_dhcp_route_get_gateway(static_routes
[i
], &route
->gw
.in
) >= 0);
109 assert_se(sd_dhcp_route_get_destination(static_routes
[i
], &route
->dst
.in
) >= 0);
110 assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes
[i
], &route
->dst_prefixlen
) >= 0);
111 route
->priority
= link
->network
->dhcp_route_metric
;
112 route
->table
= table
;
113 route
->scope
= route_scope_from_address(route
, &address
);
115 r
= route_configure(route
, link
, dhcp4_route_handler
);
117 return log_link_warning_errno(link
, r
, "Could not set host route: %m");
119 link
->dhcp4_messages
++;
122 r
= sd_dhcp_lease_get_router(link
->dhcp_lease
, &router
);
123 if (IN_SET(r
, 0, -ENODATA
))
124 log_link_info(link
, "DHCP: No gateway received from DHCP server.");
126 log_link_warning_errno(link
, r
, "DHCP error: could not get gateway: %m");
127 else if (in4_addr_is_null(&router
[0]))
128 log_link_info(link
, "DHCP: Received gateway is null.");
130 /* According to RFC 3442: If the DHCP server returns both a Classless Static Routes option and
131 a Router option, the DHCP client MUST ignore the Router option. */
132 if (classless_route
&& static_route
)
133 log_link_warning(link
, "Classless static routes received from DHCP server: ignoring static-route option and router option");
135 if (r
> 0 && !classless_route
&& !in4_addr_is_null(&router
[0])) {
136 _cleanup_(route_freep
) Route
*route
= NULL
, *route_gw
= NULL
;
138 r
= route_new(&route_gw
);
140 return log_link_error_errno(link
, r
, "Could not allocate route: %m");
142 /* The dhcp netmask may mask out the gateway. Add an explicit
143 * route for the gw host so that we can route no matter the
144 * netmask or existing kernel route tables. */
145 route_gw
->family
= AF_INET
;
146 route_gw
->dst
.in
= router
[0];
147 route_gw
->dst_prefixlen
= 32;
148 route_gw
->prefsrc
.in
= address
;
149 route_gw
->scope
= RT_SCOPE_LINK
;
150 route_gw
->protocol
= RTPROT_DHCP
;
151 route_gw
->priority
= link
->network
->dhcp_route_metric
;
152 route_gw
->table
= table
;
154 r
= route_configure(route_gw
, link
, dhcp4_route_handler
);
156 return log_link_warning_errno(link
, r
, "Could not set host route: %m");
158 link
->dhcp4_messages
++;
160 r
= route_new(&route
);
162 return log_link_error_errno(link
, r
, "Could not allocate route: %m");
164 route
->family
= AF_INET
;
165 route
->gw
.in
= router
[0];
166 route
->prefsrc
.in
= address
;
167 route
->protocol
= RTPROT_DHCP
;
168 route
->priority
= link
->network
->dhcp_route_metric
;
169 route
->table
= table
;
171 r
= route_configure(route
, link
, dhcp4_route_handler
);
173 log_link_warning_errno(link
, r
, "Could not set routes: %m");
174 link_enter_failed(link
);
178 link
->dhcp4_messages
++;
184 static int dhcp_remove_routes(Link
*link
, struct in_addr
*address
) {
185 _cleanup_free_ sd_dhcp_route
**routes
= NULL
;
192 if (!link
->network
->dhcp_use_routes
)
195 n
= sd_dhcp_lease_get_routes(link
->dhcp_lease
, &routes
);
196 if (IN_SET(n
, 0, -ENODATA
)) {
197 log_link_debug(link
, "DHCP: No routes received from DHCP server: %m");
200 return log_link_error_errno(link
, n
, "DHCP error: could not get routes: %m");
202 table
= link_get_dhcp_route_table(link
);
204 for (i
= 0; i
< n
; i
++) {
205 _cleanup_(route_freep
) Route
*route
= NULL
;
207 r
= route_new(&route
);
211 route
->family
= AF_INET
;
212 assert_se(sd_dhcp_route_get_gateway(routes
[i
], &route
->gw
.in
) >= 0);
213 assert_se(sd_dhcp_route_get_destination(routes
[i
], &route
->dst
.in
) >= 0);
214 assert_se(sd_dhcp_route_get_destination_prefix_length(routes
[i
], &route
->dst_prefixlen
) >= 0);
215 route
->priority
= link
->network
->dhcp_route_metric
;
216 route
->table
= table
;
217 route
->scope
= route_scope_from_address(route
, address
);
219 (void) route_remove(route
, link
, NULL
);
225 static int dhcp_remove_router(Link
*link
, struct in_addr
*address
) {
226 _cleanup_(route_freep
) Route
*route_gw
= NULL
, *route
= NULL
;
227 const struct in_addr
*router
;
234 if (!link
->network
->dhcp_use_routes
)
237 r
= sd_dhcp_lease_get_router(link
->dhcp_lease
, &router
);
238 if (IN_SET(r
, 0, -ENODATA
)) {
239 log_link_debug(link
, "DHCP: No gateway received from DHCP server.");
242 return log_link_error_errno(link
, r
, "DHCP error: could not get gateway: %m");
243 else if (in4_addr_is_null(&router
[0])) {
244 log_link_info(link
, "DHCP: Received gateway is null, ignoring.");
248 table
= link_get_dhcp_route_table(link
);
250 r
= route_new(&route_gw
);
254 route_gw
->family
= AF_INET
;
255 route_gw
->dst
.in
= router
[0];
256 route_gw
->dst_prefixlen
= 32;
257 route_gw
->prefsrc
.in
= *address
;
258 route_gw
->scope
= RT_SCOPE_LINK
;
259 route_gw
->protocol
= RTPROT_DHCP
;
260 route_gw
->priority
= link
->network
->dhcp_route_metric
;
261 route_gw
->table
= table
;
263 (void) route_remove(route_gw
, link
, NULL
);
265 r
= route_new(&route
);
269 route
->family
= AF_INET
;
270 route
->gw
.in
= router
[0];
271 route
->prefsrc
.in
= *address
;
272 route
->protocol
= RTPROT_DHCP
;
273 route
->priority
= link
->network
->dhcp_route_metric
;
274 route
->table
= table
;
276 (void) route_remove(route
, link
, NULL
);
281 static int dhcp_remove_address(Link
*link
, struct in_addr
*address
) {
282 _cleanup_(address_freep
) Address
*a
= NULL
;
283 struct in_addr netmask
;
289 if (in4_addr_is_null(address
))
297 a
->in_addr
.in
= *address
;
299 if (sd_dhcp_lease_get_netmask(link
->dhcp_lease
, &netmask
) >= 0)
300 a
->prefixlen
= in4_addr_netmask_to_prefixlen(&netmask
);
302 (void) address_remove(a
, link
, NULL
);
307 static int dhcp_reset_mtu(Link
*link
) {
313 if (!link
->network
->dhcp_use_mtu
)
316 r
= sd_dhcp_lease_get_mtu(link
->dhcp_lease
, &mtu
);
320 if (link
->original_mtu
== mtu
)
323 r
= link_set_mtu(link
, link
->original_mtu
);
325 log_link_error_errno(link
, r
, "DHCP error: could not reset MTU: %m");
326 link_enter_failed(link
);
333 static int dhcp_reset_hostname(Link
*link
) {
334 const char *hostname
;
339 if (!link
->network
->dhcp_use_hostname
)
342 hostname
= link
->network
->dhcp_hostname
;
344 (void) sd_dhcp_lease_get_hostname(link
->dhcp_lease
, &hostname
);
349 /* If a hostname was set due to the lease, then unset it now. */
350 r
= manager_set_hostname(link
->manager
, NULL
);
352 return log_link_error_errno(link
, r
, "DHCP error: Failed to reset transient hostname: %m");
357 static int dhcp_lease_lost(Link
*link
) {
358 struct in_addr address
= {};
361 assert(link
->dhcp_lease
);
363 log_link_warning(link
, "DHCP lease lost");
365 link
->dhcp4_configured
= false;
367 (void) sd_dhcp_lease_get_address(link
->dhcp_lease
, &address
);
368 (void) dhcp_remove_routes(link
, &address
);
369 (void) dhcp_remove_router(link
, &address
);
370 (void) dhcp_remove_address(link
, &address
);
371 (void) dhcp_reset_mtu(link
);
372 (void) dhcp_reset_hostname(link
);
374 link
->dhcp_lease
= sd_dhcp_lease_unref(link
->dhcp_lease
);
380 static int dhcp4_address_handler(sd_netlink
*rtnl
, sd_netlink_message
*m
, Link
*link
) {
385 r
= sd_netlink_message_get_errno(m
);
386 if (r
< 0 && r
!= -EEXIST
) {
387 log_link_error_errno(link
, r
, "Could not set DHCPv4 address: %m");
388 link_enter_failed(link
);
390 manager_rtnl_process_address(rtnl
, m
, link
->manager
);
392 link_set_dhcp_routes(link
);
394 /* Add back static routes since kernel removes while DHCPv4 address is removed from when lease expires */
395 link_request_set_routes(link
);
397 if (link
->dhcp4_messages
== 0) {
398 link
->dhcp4_configured
= true;
399 link_check_ready(link
);
405 static int dhcp4_update_address(Link
*link
,
406 struct in_addr
*address
,
407 struct in_addr
*netmask
,
409 _cleanup_(address_freep
) Address
*addr
= NULL
;
417 prefixlen
= in4_addr_netmask_to_prefixlen(netmask
);
419 r
= address_new(&addr
);
423 addr
->family
= AF_INET
;
424 addr
->in_addr
.in
.s_addr
= address
->s_addr
;
425 addr
->cinfo
.ifa_prefered
= lifetime
;
426 addr
->cinfo
.ifa_valid
= lifetime
;
427 addr
->prefixlen
= prefixlen
;
428 addr
->broadcast
.s_addr
= address
->s_addr
| ~netmask
->s_addr
;
430 /* allow reusing an existing address and simply update its lifetime
431 * in case it already exists */
432 r
= address_configure(addr
, link
, dhcp4_address_handler
, true);
439 static int dhcp_lease_renew(sd_dhcp_client
*client
, Link
*link
) {
440 sd_dhcp_lease
*lease
;
441 struct in_addr address
;
442 struct in_addr netmask
;
443 uint32_t lifetime
= CACHE_INFO_INFINITY_LIFE_TIME
;
448 assert(link
->network
);
450 r
= sd_dhcp_client_get_lease(client
, &lease
);
452 return log_link_warning_errno(link
, r
, "DHCP error: no lease: %m");
454 sd_dhcp_lease_unref(link
->dhcp_lease
);
455 link
->dhcp4_configured
= false;
456 link
->dhcp_lease
= sd_dhcp_lease_ref(lease
);
459 r
= sd_dhcp_lease_get_address(lease
, &address
);
461 return log_link_warning_errno(link
, r
, "DHCP error: no address: %m");
463 r
= sd_dhcp_lease_get_netmask(lease
, &netmask
);
465 return log_link_warning_errno(link
, r
, "DHCP error: no netmask: %m");
467 if (!link
->network
->dhcp_critical
) {
468 r
= sd_dhcp_lease_get_lifetime(link
->dhcp_lease
, &lifetime
);
470 return log_link_warning_errno(link
, r
, "DHCP error: no lifetime: %m");
473 r
= dhcp4_update_address(link
, &address
, &netmask
, lifetime
);
475 log_link_warning_errno(link
, r
, "Could not update IP address: %m");
476 link_enter_failed(link
);
483 static int dhcp_lease_acquired(sd_dhcp_client
*client
, Link
*link
) {
484 const struct in_addr
*router
;
485 sd_dhcp_lease
*lease
;
486 struct in_addr address
;
487 struct in_addr netmask
;
489 uint32_t lifetime
= CACHE_INFO_INFINITY_LIFE_TIME
;
495 link
->dhcp4_configured
= false;
497 r
= sd_dhcp_client_get_lease(client
, &lease
);
499 return log_link_error_errno(link
, r
, "DHCP error: No lease: %m");
501 r
= sd_dhcp_lease_get_address(lease
, &address
);
503 return log_link_error_errno(link
, r
, "DHCP error: No address: %m");
505 r
= sd_dhcp_lease_get_netmask(lease
, &netmask
);
507 return log_link_error_errno(link
, r
, "DHCP error: No netmask: %m");
509 prefixlen
= in4_addr_netmask_to_prefixlen(&netmask
);
511 r
= sd_dhcp_lease_get_router(lease
, &router
);
512 if (r
< 0 && r
!= -ENODATA
)
513 return log_link_error_errno(link
, r
, "DHCP error: Could not get gateway: %m");
515 if (r
> 0 && !in4_addr_is_null(&router
[0]))
517 LOG_LINK_INTERFACE(link
),
518 LOG_LINK_MESSAGE(link
, "DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
519 ADDRESS_FMT_VAL(address
),
521 ADDRESS_FMT_VAL(router
[0])),
522 "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address
),
523 "PREFIXLEN=%u", prefixlen
,
524 "GATEWAY=%u.%u.%u.%u", ADDRESS_FMT_VAL(router
[0]));
527 LOG_LINK_INTERFACE(link
),
528 LOG_LINK_MESSAGE(link
, "DHCPv4 address %u.%u.%u.%u/%u",
529 ADDRESS_FMT_VAL(address
),
531 "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address
),
532 "PREFIXLEN=%u", prefixlen
);
534 link
->dhcp_lease
= sd_dhcp_lease_ref(lease
);
537 if (link
->network
->dhcp_use_mtu
) {
540 r
= sd_dhcp_lease_get_mtu(lease
, &mtu
);
542 r
= link_set_mtu(link
, mtu
);
544 log_link_error_errno(link
, r
, "Failed to set MTU to %" PRIu16
": %m", mtu
);
548 if (link
->network
->dhcp_use_hostname
) {
549 const char *dhcpname
= NULL
;
550 _cleanup_free_
char *hostname
= NULL
;
552 if (link
->network
->dhcp_hostname
)
553 dhcpname
= link
->network
->dhcp_hostname
;
555 (void) sd_dhcp_lease_get_hostname(lease
, &dhcpname
);
558 r
= shorten_overlong(dhcpname
, &hostname
);
560 log_link_warning_errno(link
, r
, "Unable to shorten overlong DHCP hostname '%s', ignoring: %m", dhcpname
);
562 log_link_notice(link
, "Overlong DHCP hostname received, shortened from '%s' to '%s'", dhcpname
, hostname
);
566 r
= manager_set_hostname(link
->manager
, hostname
);
568 log_link_error_errno(link
, r
, "Failed to set transient hostname to '%s': %m", hostname
);
572 if (link
->network
->dhcp_use_timezone
) {
573 const char *tz
= NULL
;
575 (void) sd_dhcp_lease_get_timezone(link
->dhcp_lease
, &tz
);
578 r
= manager_set_timezone(link
->manager
, tz
);
580 log_link_error_errno(link
, r
, "Failed to set timezone to '%s': %m", tz
);
584 if (!link
->network
->dhcp_critical
) {
585 r
= sd_dhcp_lease_get_lifetime(link
->dhcp_lease
, &lifetime
);
587 return log_link_warning_errno(link
, r
, "DHCP error: no lifetime: %m");
590 r
= dhcp4_update_address(link
, &address
, &netmask
, lifetime
);
592 log_link_warning_errno(link
, r
, "Could not update IP address: %m");
593 link_enter_failed(link
);
600 static int dhcp_server_is_black_listed(Link
*link
, sd_dhcp_client
*client
) {
601 sd_dhcp_lease
*lease
;
606 assert(link
->network
);
609 r
= sd_dhcp_client_get_lease(client
, &lease
);
611 return log_link_error_errno(link
, r
, "Failed to get DHCP lease: %m");
613 r
= sd_dhcp_lease_get_server_identifier(lease
, &addr
);
615 return log_link_debug_errno(link
, r
, "Failed to get DHCP server ip address: %m");
617 if (set_contains(link
->network
->dhcp_black_listed_ip
, UINT32_TO_PTR(addr
.s_addr
))) {
618 log_struct(LOG_DEBUG
,
619 LOG_LINK_INTERFACE(link
),
620 LOG_LINK_MESSAGE(link
, "DHCPv4 ip '%u.%u.%u.%u' found in black listed ip addresses, ignoring offer",
621 ADDRESS_FMT_VAL(addr
)));
628 static int dhcp4_handler(sd_dhcp_client
*client
, int event
, void *userdata
) {
629 Link
*link
= userdata
;
633 assert(link
->network
);
634 assert(link
->manager
);
636 if (IN_SET(link
->state
, LINK_STATE_FAILED
, LINK_STATE_LINGER
))
640 case SD_DHCP_CLIENT_EVENT_STOP
:
642 if (link_ipv4ll_enabled(link
, ADDRESS_FAMILY_FALLBACK_IPV4
)) {
643 assert(link
->ipv4ll
);
645 log_link_debug(link
, "DHCP client is stopped. Acquiring IPv4 link-local address");
647 r
= sd_ipv4ll_start(link
->ipv4ll
);
649 return log_link_warning_errno(link
, r
, "Could not acquire IPv4 link-local address: %m");
652 if (link
->network
->dhcp_critical
) {
653 log_link_notice(link
, "DHCPv4 connection considered critical, ignoring request to reconfigure it.");
657 if (link
->network
->dhcp_send_release
)
658 (void) sd_dhcp_client_send_release(client
);
660 if (link
->dhcp_lease
) {
661 r
= dhcp_lease_lost(link
);
663 link_enter_failed(link
);
669 case SD_DHCP_CLIENT_EVENT_EXPIRED
:
670 case SD_DHCP_CLIENT_EVENT_IP_CHANGE
:
672 if (link
->network
->dhcp_critical
) {
673 log_link_notice(link
, "DHCPv4 connection considered critical, ignoring request to reconfigure it.");
677 if (link
->dhcp_lease
) {
678 r
= dhcp_lease_lost(link
);
680 link_enter_failed(link
);
685 if (event
== SD_DHCP_CLIENT_EVENT_IP_CHANGE
) {
686 r
= dhcp_lease_acquired(client
, link
);
688 link_enter_failed(link
);
694 case SD_DHCP_CLIENT_EVENT_RENEW
:
695 r
= dhcp_lease_renew(client
, link
);
697 link_enter_failed(link
);
701 case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE
:
702 r
= dhcp_lease_acquired(client
, link
);
704 link_enter_failed(link
);
708 case SD_DHCP_CLIENT_EVENT_SELECTING
:
709 r
= dhcp_server_is_black_listed(link
, client
);
717 log_link_warning_errno(link
, event
, "DHCP error: Client failed: %m");
719 log_link_warning(link
, "DHCP unknown event: %i", event
);
726 static int dhcp4_set_hostname(Link
*link
) {
727 _cleanup_free_
char *hostname
= NULL
;
733 if (!link
->network
->dhcp_send_hostname
)
735 else if (link
->network
->dhcp_hostname
)
736 hn
= link
->network
->dhcp_hostname
;
738 r
= gethostname_strict(&hostname
);
739 if (r
< 0 && r
!= -ENXIO
) /* ENXIO: no hostname set or hostname is "localhost" */
745 r
= sd_dhcp_client_set_hostname(link
->dhcp_client
, hn
);
746 if (r
== -EINVAL
&& hostname
)
747 /* Ignore error when the machine's hostname is not suitable to send in DHCP packet. */
748 log_link_warning_errno(link
, r
, "DHCP4 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m");
750 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set hostname: %m");
755 static bool promote_secondaries_enabled(const char *ifname
) {
756 _cleanup_free_
char *promote_secondaries_sysctl
= NULL
;
757 char *promote_secondaries_path
;
760 promote_secondaries_path
= strjoina("net/ipv4/conf/", ifname
, "/promote_secondaries");
761 r
= sysctl_read(promote_secondaries_path
, &promote_secondaries_sysctl
);
763 log_debug_errno(r
, "Cannot read sysctl %s", promote_secondaries_path
);
767 truncate_nl(promote_secondaries_sysctl
);
768 r
= parse_boolean(promote_secondaries_sysctl
);
770 log_warning_errno(r
, "Cannot parse sysctl %s with content %s as boolean", promote_secondaries_path
, promote_secondaries_sysctl
);
774 /* dhcp4_set_promote_secondaries will ensure this interface has
775 * the "promote_secondaries" option in the kernel set. If this sysctl
776 * is not set DHCP will work only as long as the IP address does not
777 * changes between leases. The kernel will remove all secondary IP
778 * addresses of an interface otherwise. The way systemd-network works
779 * is that the new IP of a lease is added as a secondary IP and when
780 * the primary one expires it relies on the kernel to promote the
781 * secondary IP. See also https://github.com/systemd/systemd/issues/7163
783 int dhcp4_set_promote_secondaries(Link
*link
) {
787 assert(link
->network
);
788 assert(link
->network
->dhcp
& ADDRESS_FAMILY_IPV4
);
790 /* check if the kernel has promote_secondaries enabled for our
791 * interface. If it is not globally enabled or enabled for the
792 * specific interface we must either enable it.
794 if (!(promote_secondaries_enabled("all") || promote_secondaries_enabled(link
->ifname
))) {
795 char *promote_secondaries_path
= NULL
;
797 log_link_debug(link
, "promote_secondaries is unset, setting it");
798 promote_secondaries_path
= strjoina("net/ipv4/conf/", link
->ifname
, "/promote_secondaries");
799 r
= sysctl_write(promote_secondaries_path
, "1");
801 log_link_warning_errno(link
, r
, "cannot set sysctl %s to 1", promote_secondaries_path
);
808 int dhcp4_set_client_identifier(Link
*link
) {
812 assert(link
->network
);
813 assert(link
->dhcp_client
);
815 switch (link
->network
->dhcp_client_identifier
) {
816 case DHCP_CLIENT_ID_DUID
: {
817 /* If configured, apply user specified DUID and IAID */
818 const DUID
*duid
= link_get_duid(link
);
820 if (duid
->type
== DUID_TYPE_LLT
&& duid
->raw_data_len
== 0)
821 r
= sd_dhcp_client_set_iaid_duid_llt(link
->dhcp_client
,
822 link
->network
->iaid_set
,
826 r
= sd_dhcp_client_set_iaid_duid(link
->dhcp_client
,
827 link
->network
->iaid_set
,
830 duid
->raw_data_len
> 0 ? duid
->raw_data
: NULL
,
833 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set IAID+DUID: %m");
836 case DHCP_CLIENT_ID_DUID_ONLY
: {
837 /* If configured, apply user specified DUID */
838 const DUID
*duid
= link_get_duid(link
);
840 if (duid
->type
== DUID_TYPE_LLT
&& duid
->raw_data_len
== 0)
841 r
= sd_dhcp_client_set_duid_llt(link
->dhcp_client
,
844 r
= sd_dhcp_client_set_duid(link
->dhcp_client
,
846 duid
->raw_data_len
> 0 ? duid
->raw_data
: NULL
,
849 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set DUID: %m");
852 case DHCP_CLIENT_ID_MAC
:
853 r
= sd_dhcp_client_set_client_id(link
->dhcp_client
,
855 (const uint8_t *) &link
->mac
,
858 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set client ID: %m");
861 assert_not_reached("Unknown client identifier type.");
867 int dhcp4_configure(Link
*link
) {
871 assert(link
->network
);
872 assert(link
->network
->dhcp
& ADDRESS_FAMILY_IPV4
);
874 if (!link
->dhcp_client
) {
875 r
= sd_dhcp_client_new(&link
->dhcp_client
, link
->network
->dhcp_anonymize
);
879 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to create DHCP4 client: %m");
882 r
= sd_dhcp_client_attach_event(link
->dhcp_client
, NULL
, 0);
884 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to attach event: %m");
886 r
= sd_dhcp_client_set_mac(link
->dhcp_client
,
887 (const uint8_t *) &link
->mac
,
888 sizeof (link
->mac
), ARPHRD_ETHER
);
890 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set MAC address: %m");
892 r
= sd_dhcp_client_set_ifindex(link
->dhcp_client
, link
->ifindex
);
894 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set ifindex: %m");
896 r
= sd_dhcp_client_set_callback(link
->dhcp_client
, dhcp4_handler
, link
);
898 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set callback: %m");
900 r
= sd_dhcp_client_set_request_broadcast(link
->dhcp_client
,
901 link
->network
->dhcp_broadcast
);
903 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set request flag for broadcast: %m");
906 r
= sd_dhcp_client_set_mtu(link
->dhcp_client
, link
->mtu
);
908 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set MTU: %m");
911 if (link
->network
->dhcp_use_mtu
) {
912 r
= sd_dhcp_client_set_request_option(link
->dhcp_client
,
913 SD_DHCP_OPTION_INTERFACE_MTU
);
915 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set request flag for MTU: %m");
918 /* NOTE: even if this variable is called "use", it also "sends" PRL
919 * options, maybe there should be a different configuration variable
920 * to send or not route options?. */
921 /* NOTE: when using Anonymize=yes, routes PRL options are sent
922 * by default, so they don't need to be added here. */
923 if (link
->network
->dhcp_use_routes
&& !link
->network
->dhcp_anonymize
) {
924 r
= sd_dhcp_client_set_request_option(link
->dhcp_client
,
925 SD_DHCP_OPTION_STATIC_ROUTE
);
927 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set request flag for static route: %m");
929 r
= sd_dhcp_client_set_request_option(link
->dhcp_client
,
930 SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE
);
932 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set request flag for classless static route: %m");
935 if (link
->network
->dhcp_use_ntp
) {
936 r
= sd_dhcp_client_set_request_option(link
->dhcp_client
, SD_DHCP_OPTION_NTP_SERVER
);
938 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set request flag for NTP server: %m");
941 if (link
->network
->dhcp_use_timezone
) {
942 r
= sd_dhcp_client_set_request_option(link
->dhcp_client
, SD_DHCP_OPTION_NEW_TZDB_TIMEZONE
);
944 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set request flag for timezone: %m");
947 r
= dhcp4_set_hostname(link
);
951 if (link
->network
->dhcp_vendor_class_identifier
) {
952 r
= sd_dhcp_client_set_vendor_class_identifier(link
->dhcp_client
,
953 link
->network
->dhcp_vendor_class_identifier
);
955 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set vendor class identifier: %m");
958 if (link
->network
->dhcp_user_class
) {
959 r
= sd_dhcp_client_set_user_class(link
->dhcp_client
, (const char **) link
->network
->dhcp_user_class
);
961 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set user class: %m");
964 if (link
->network
->dhcp_client_port
) {
965 r
= sd_dhcp_client_set_client_port(link
->dhcp_client
, link
->network
->dhcp_client_port
);
967 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set listen port: %m");
970 if (link
->network
->dhcp_max_attempts
> 0) {
971 r
= sd_dhcp_client_set_max_attempts(link
->dhcp_client
, link
->network
->dhcp_max_attempts
);
973 return log_link_error_errno(link
, r
, "DHCP4 CLIENT: Failed to set max attempts: %m");
976 return dhcp4_set_client_identifier(link
);