[thirdparty/systemd.git] / src / network / networkd-dhcp4.c

/***
  This file is part of systemd.

  Copyright 2013-2014 Tom Gundersen <teg@jklm.no>

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <netinet/ether.h>
#include <linux/if.h>

#include "alloc-util.h"
#include "dhcp-lease-internal.h"
#include "hostname-util.h"
#include "network-internal.h"
#include "networkd.h"

static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m,
                               void *userdata) {
        _cleanup_link_unref_ Link *link = userdata;
        int r;

        assert(link);
        assert(link->dhcp4_messages > 0);

        link->dhcp4_messages--;

        r = sd_netlink_message_get_errno(m);
        if (r < 0 && r != -EEXIST) {
                log_link_error_errno(link, r, "Could not set DHCPv4 route: %m");
                link_enter_failed(link);
        }

        if (link->dhcp4_messages == 0) {
                link->dhcp4_configured = true;
                link_check_ready(link);
        }

        return 1;
}

static int link_set_dhcp_routes(Link *link) {
        struct in_addr gateway;
        _cleanup_free_ sd_dhcp_route **static_routes = NULL;
        int r, n, i;

        assert(link);
        assert(link->dhcp_lease);
        assert(link->network);

        if (!link->network->dhcp_use_routes)
                return 0;

        r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
        if (r < 0 && r != -ENODATA)
                return log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m");

        if (r >= 0) {
                struct in_addr address;
                _cleanup_route_free_ Route *route = NULL;
                _cleanup_route_free_ Route *route_gw = NULL;

                r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
                if (r < 0)
                        return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");

                r = route_new(&route);
                if (r < 0)
                        return log_link_error_errno(link, r, "Could not allocate route: %m");

                route->protocol = RTPROT_DHCP;

                r = route_new(&route_gw);
                if (r < 0)
                        return log_link_error_errno(link, r,  "Could not allocate route: %m");

                /* The dhcp netmask may mask out the gateway. Add an explicit
                 * route for the gw host so that we can route no matter the
                 * netmask or existing kernel route tables. */
                route_gw->family = AF_INET;
                route_gw->dst.in = gateway;
                route_gw->dst_prefixlen = 32;
                route_gw->prefsrc.in = address;
                route_gw->scope = RT_SCOPE_LINK;
                route_gw->protocol = RTPROT_DHCP;
                route_gw->priority = link->network->dhcp_route_metric;

                r = route_configure(route_gw, link, &dhcp4_route_handler);
                if (r < 0)
                        return log_link_warning_errno(link, r, "Could not set host route: %m");

                link->dhcp4_messages++;

                route->family = AF_INET;
                route->gw.in = gateway;
                route->prefsrc.in = address;
                route->priority = link->network->dhcp_route_metric;

                r = route_configure(route, link, &dhcp4_route_handler);
                if (r < 0) {
                        log_link_warning_errno(link, r, "Could not set routes: %m");
                        link_enter_failed(link);
                        return r;
                }

                link->dhcp4_messages++;
        }

        n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
        if (n == -ENODATA)
                return 0;
        if (n < 0)
                return log_link_warning_errno(link, n, "DHCP error: could not get routes: %m");

        for (i = 0; i < n; i++) {
                _cleanup_route_free_ Route *route = NULL;

                r = route_new(&route);
                if (r < 0)
                        return log_link_error_errno(link, r, "Could not allocate route: %m");

                route->family = AF_INET;
                route->protocol = RTPROT_DHCP;
                assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0);
                assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0);
                assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0);
                route->priority = link->network->dhcp_route_metric;

                r = route_configure(route, link, &dhcp4_route_handler);
                if (r < 0)
                        return log_link_warning_errno(link, r, "Could not set host route: %m");

                link->dhcp4_messages++;
        }

        return 0;
}

static int dhcp_lease_lost(Link *link) {
        _cleanup_address_free_ Address *address = NULL;
        struct in_addr addr;
        struct in_addr netmask;
        struct in_addr gateway;
        unsigned prefixlen = 0;
        int r;

        assert(link);
        assert(link->dhcp_lease);

        log_link_warning(link, "DHCP lease lost");

        if (link->network->dhcp_use_routes) {
                _cleanup_free_ sd_dhcp_route **routes = NULL;
                int n, i;

                n = sd_dhcp_lease_get_routes(link->dhcp_lease, &routes);
                if (n >= 0) {
                        for (i = 0; i < n; i++) {
                                _cleanup_route_free_ Route *route = NULL;

                                r = route_new(&route);
                                if (r >= 0) {
                                        route->family = AF_INET;
                                        assert_se(sd_dhcp_route_get_gateway(routes[i], &route->gw.in) >= 0);
                                        assert_se(sd_dhcp_route_get_destination(routes[i], &route->dst.in) >= 0);
                                        assert_se(sd_dhcp_route_get_destination_prefix_length(routes[i], &route->dst_prefixlen) >= 0);

                                        route_remove(route, link,
                                                   &link_route_remove_handler);
                                }
                        }
                }
        }

        r = address_new(&address);
        if (r >= 0) {
                r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
                if (r >= 0) {
                        _cleanup_route_free_ Route *route_gw = NULL;
                        _cleanup_route_free_ Route *route = NULL;

                        r = route_new(&route_gw);
                        if (r >= 0) {
                                route_gw->family = AF_INET;
                                route_gw->dst.in = gateway;
                                route_gw->dst_prefixlen = 32;
                                route_gw->scope = RT_SCOPE_LINK;

                                route_remove(route_gw, link,
                                           &link_route_remove_handler);
                        }

                        r = route_new(&route);
                        if (r >= 0) {
                                route->family = AF_INET;
                                route->gw.in = gateway;

                                route_remove(route, link,
                                           &link_route_remove_handler);
                        }
                }

                r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
                if (r >= 0) {
                        r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
                        if (r >= 0)
                                prefixlen = in_addr_netmask_to_prefixlen(&netmask);

                        address->family = AF_INET;
                        address->in_addr.in = addr;
                        address->prefixlen = prefixlen;

                        address_remove(address, link, &link_address_remove_handler);
                }
        }

        if (link->network->dhcp_use_mtu) {
                uint16_t mtu;

                r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
                if (r >= 0 && link->original_mtu != mtu) {
                        r = link_set_mtu(link, link->original_mtu);
                        if (r < 0) {
                                log_link_warning(link,
                                                 "DHCP error: could not reset MTU");
                                link_enter_failed(link);
                                return r;
                        }
                }
        }

        if (link->network->dhcp_use_hostname) {
                const char *hostname = NULL;

                if (link->network->dhcp_hostname)
                        hostname = link->network->dhcp_hostname;
                else
                        (void) sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);

                if (hostname) {
                        /* If a hostname was set due to the lease, then unset it now. */
                        r = link_set_hostname(link, NULL);
                        if (r < 0)
                                log_link_warning_errno(link, r, "Failed to reset transient hostname: %m");
                }
        }

        link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
        link_dirty(link);
        link->dhcp4_configured = false;

        return 0;
}

static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m,
                                 void *userdata) {
        _cleanup_link_unref_ Link *link = userdata;
        int r;

        assert(link);

        r = sd_netlink_message_get_errno(m);
        if (r < 0 && r != -EEXIST) {
                log_link_error_errno(link, r, "Could not set DHCPv4 address: %m");
                link_enter_failed(link);
        } else if (r >= 0)
                manager_rtnl_process_address(rtnl, m, link->manager);

        link_set_dhcp_routes(link);

        return 1;
}

static int dhcp4_update_address(Link *link,
                                struct in_addr *address,
                                struct in_addr *netmask,
                                uint32_t lifetime) {
        _cleanup_address_free_ Address *addr = NULL;
        unsigned prefixlen;
        int r;

        assert(address);
        assert(netmask);
        assert(lifetime);

        prefixlen = in_addr_netmask_to_prefixlen(netmask);

        r = address_new(&addr);
        if (r < 0)
                return r;

        addr->family = AF_INET;
        addr->in_addr.in.s_addr = address->s_addr;
        addr->cinfo.ifa_prefered = lifetime;
        addr->cinfo.ifa_valid = lifetime;
        addr->prefixlen = prefixlen;
        addr->broadcast.s_addr = address->s_addr | ~netmask->s_addr;

        /* allow reusing an existing address and simply update its lifetime
         * in case it already exists */
        r = address_configure(addr, link, &dhcp4_address_handler, true);
        if (r < 0)
                return r;

        return 0;
}

static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) {
        sd_dhcp_lease *lease;
        struct in_addr address;
        struct in_addr netmask;
        uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
        int r;

        assert(link);
        assert(client);
        assert(link->network);

        r = sd_dhcp_client_get_lease(client, &lease);
        if (r < 0)
                return log_link_warning_errno(link, r, "DHCP error: no lease: %m");

        sd_dhcp_lease_unref(link->dhcp_lease);
        link->dhcp4_configured = false;
        link->dhcp_lease = sd_dhcp_lease_ref(lease);
        link_dirty(link);

        r = sd_dhcp_lease_get_address(lease, &address);
        if (r < 0)
                return log_link_warning_errno(link, r, "DHCP error: no address: %m");

        r = sd_dhcp_lease_get_netmask(lease, &netmask);
        if (r < 0)
                return log_link_warning_errno(link, r, "DHCP error: no netmask: %m");

        if (!link->network->dhcp_critical) {
                r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
                if (r < 0)
                        return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
        }

        r = dhcp4_update_address(link, &address, &netmask, lifetime);
        if (r < 0) {
                log_link_warning_errno(link, r, "Could not update IP address: %m");
                link_enter_failed(link);
                return r;
        }

        return 0;
}

static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
        sd_dhcp_lease *lease;
        struct in_addr address;
        struct in_addr netmask;
        struct in_addr gateway;
        unsigned prefixlen;
        uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
        int r;

        assert(client);
        assert(link);

        r = sd_dhcp_client_get_lease(client, &lease);
        if (r < 0)
                return log_link_error_errno(link, r, "DHCP error: No lease: %m");

        r = sd_dhcp_lease_get_address(lease, &address);
        if (r < 0)
                return log_link_error_errno(link, r, "DHCP error: No address: %m");

        r = sd_dhcp_lease_get_netmask(lease, &netmask);
        if (r < 0)
                return log_link_error_errno(link, r, "DHCP error: No netmask: %m");

        prefixlen = in_addr_netmask_to_prefixlen(&netmask);

        r = sd_dhcp_lease_get_router(lease, &gateway);
        if (r < 0 && r != -ENODATA)
                return log_link_error_errno(link, r, "DHCP error: Could not get gateway: %m");

        if (r >= 0)
                log_struct(LOG_INFO,
                           LOG_LINK_INTERFACE(link),
                           LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
                                            ADDRESS_FMT_VAL(address),
                                            prefixlen,
                                            ADDRESS_FMT_VAL(gateway)),
                           "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
                           "PREFIXLEN=%u", prefixlen,
                           "GATEWAY=%u.%u.%u.%u", ADDRESS_FMT_VAL(gateway),
                           NULL);
        else
                log_struct(LOG_INFO,
                           LOG_LINK_INTERFACE(link),
                           LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u",
                                            ADDRESS_FMT_VAL(address),
                                            prefixlen),
                           "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
                           "PREFIXLEN=%u", prefixlen,
                           NULL);

        link->dhcp_lease = sd_dhcp_lease_ref(lease);
        link_dirty(link);

        if (link->network->dhcp_use_mtu) {
                uint16_t mtu;

                r = sd_dhcp_lease_get_mtu(lease, &mtu);
                if (r >= 0) {
                        r = link_set_mtu(link, mtu);
                        if (r < 0)
                                log_link_error_errno(link, r, "Failed to set MTU to %" PRIu16 ": %m", mtu);
                }
        }

        if (link->network->dhcp_use_hostname) {
                const char *hostname = NULL;

                if (link->network->dhcp_hostname)
                        hostname = link->network->dhcp_hostname;
                else
                        (void) sd_dhcp_lease_get_hostname(lease, &hostname);

                if (hostname) {
                        r = link_set_hostname(link, hostname);
                        if (r < 0)
                                log_link_error_errno(link, r, "Failed to set transient hostname to '%s': %m", hostname);
                }
        }

        if (link->network->dhcp_use_timezone) {
                const char *tz = NULL;

                (void) sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);

                if (tz) {
                        r = link_set_timezone(link, tz);
                        if (r < 0)
                                log_link_error_errno(link, r, "Failed to set timezone to '%s': %m", tz);
                }
        }

        if (!link->network->dhcp_critical) {
                r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
                if (r < 0) {
                        log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
                        return r;
                }
        }

        r = dhcp4_update_address(link, &address, &netmask, lifetime);
        if (r < 0) {
                log_link_warning_errno(link, r, "Could not update IP address: %m");
                link_enter_failed(link);
                return r;
        }

        return 0;
}
static void dhcp4_handler(sd_dhcp_client *client, int event, void *userdata) {
        Link *link = userdata;
        int r = 0;

        assert(link);
        assert(link->network);
        assert(link->manager);

        if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
                return;

        switch (event) {
                case SD_DHCP_CLIENT_EVENT_EXPIRED:
                case SD_DHCP_CLIENT_EVENT_STOP:
                case SD_DHCP_CLIENT_EVENT_IP_CHANGE:
                        if (link->network->dhcp_critical) {
                                log_link_error(link, "DHCPv4 connection considered system critical, ignoring request to reconfigure it.");
                                return;
                        }

                        if (link->dhcp_lease) {
                                r = dhcp_lease_lost(link);
                                if (r < 0) {
                                        link_enter_failed(link);
                                        return;
                                }
                        }

                        if (event == SD_DHCP_CLIENT_EVENT_IP_CHANGE) {
                                r = dhcp_lease_acquired(client, link);
                                if (r < 0) {
                                        link_enter_failed(link);
                                        return;
                                }
                        }

                        break;
                case SD_DHCP_CLIENT_EVENT_RENEW:
                        r = dhcp_lease_renew(client, link);
                        if (r < 0) {
                                link_enter_failed(link);
                                return;
                        }
                        break;
                case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE:
                        r = dhcp_lease_acquired(client, link);
                        if (r < 0) {
                                link_enter_failed(link);
                                return;
                        }
                        break;
                default:
                        if (event < 0)
                                log_link_warning_errno(link, event, "DHCP error: Client failed: %m");
                        else
                                log_link_warning(link, "DHCP unknown event: %i", event);
                        break;
        }

        return;
}

int dhcp4_configure(Link *link) {
        int r;

        assert(link);
        assert(link->network);
        assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);

        if (!link->dhcp_client) {
                r = sd_dhcp_client_new(&link->dhcp_client);
                if (r < 0)
                        return r;
        }

        r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
        if (r < 0)
                return r;

        r = sd_dhcp_client_set_mac(link->dhcp_client,
                                   (const uint8_t *) &link->mac,
                                   sizeof (link->mac), ARPHRD_ETHER);
        if (r < 0)
                return r;

        r = sd_dhcp_client_set_index(link->dhcp_client, link->ifindex);
        if (r < 0)
                return r;

        r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link);
        if (r < 0)
                return r;

        r = sd_dhcp_client_set_request_broadcast(link->dhcp_client,
                                                 link->network->dhcp_broadcast);
        if (r < 0)
                return r;

        if (link->mtu) {
                r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
                if (r < 0)
                        return r;
        }

        if (link->network->dhcp_use_mtu) {
                r = sd_dhcp_client_set_request_option(link->dhcp_client,
                                                      SD_DHCP_OPTION_INTERFACE_MTU);
                if (r < 0)
                        return r;
        }

        if (link->network->dhcp_use_routes) {
                r = sd_dhcp_client_set_request_option(link->dhcp_client,
                                                      SD_DHCP_OPTION_STATIC_ROUTE);
                if (r < 0)
                        return r;
                r = sd_dhcp_client_set_request_option(link->dhcp_client,
                                                      SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE);
                if (r < 0)
                        return r;
        }

        /* Always acquire the timezone and NTP */
        r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NTP_SERVER);
        if (r < 0)
                return r;

        r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NEW_TZDB_TIMEZONE);
        if (r < 0)
                return r;

        if (link->network->dhcp_send_hostname) {
                _cleanup_free_ char *hostname = NULL;
                const char *hn = NULL;

                if (!link->network->dhcp_hostname) {
                        hostname = gethostname_malloc();
                        if (!hostname)
                                return -ENOMEM;

                        hn = hostname;
                } else
                        hn = link->network->dhcp_hostname;

                if (!is_localhost(hn)) {
                        r = sd_dhcp_client_set_hostname(link->dhcp_client, hn);
                        if (r < 0)
                                return r;
                }
        }

        if (link->network->dhcp_vendor_class_identifier) {
                r = sd_dhcp_client_set_vendor_class_identifier(link->dhcp_client,
                                                               link->network->dhcp_vendor_class_identifier);
                if (r < 0)
                        return r;
        }

        switch (link->network->dhcp_client_identifier) {
        case DHCP_CLIENT_ID_DUID: {
                /* If configured, apply user specified DUID and/or IAID */
                const DUID *duid = link_duid(link);

                r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
                                                 link->network->iaid,
                                                 duid->type,
                                                 duid->raw_data_len > 0 ? duid->raw_data : NULL,
                                                 duid->raw_data_len);
                if (r < 0)
                        return r;
                break;
        }
        case DHCP_CLIENT_ID_MAC:
                r = sd_dhcp_client_set_client_id(link->dhcp_client,
                                                 ARPHRD_ETHER,
                                                 (const uint8_t *) &link->mac,
                                                 sizeof(link->mac));
                if (r < 0)
                        return r;
                break;
        default:
                assert_not_reached("Unknown client identifier type.");
        }

        return 0;
}
Commit	Line	Data
3c9b8860 TG	1	/***
	2	This file is part of systemd.
	3
	4	Copyright 2013-2014 Tom Gundersen <teg@jklm.no>
	5
	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.
	10
	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.
	15
	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/>.
	18	***/
	19
	20	#include <netinet/ether.h>
	21	#include <linux/if.h>
	22
b5efdb8a LP	23	#include "alloc-util.h"
b5efdb8a LP	24	#include "dhcp-lease-internal.h"
958b66ea	25	#include "hostname-util.h"
3c9b8860	26	#include "network-internal.h"
634f0f98	27	#include "networkd.h"
3c9b8860	28
1c4baffc	29	static int dhcp4_route_handler(sd_netlink rtnl, sd_netlink_message m,
3c9b8860 TG	30	void *userdata) {
	31	_cleanup_link_unref_ Link *link = userdata;
	32	int r;
	33
	34	assert(link);
6cf4a01c	35	assert(link->dhcp4_messages > 0);
3c9b8860	36
313cefa1	37	link->dhcp4_messages--;
3c9b8860	38
1c4baffc	39	r = sd_netlink_message_get_errno(m);
3c9b8860	40	if (r < 0 && r != -EEXIST) {
f6b8196f	41	log_link_error_errno(link, r, "Could not set DHCPv4 route: %m");
3c9b8860 TG	42	link_enter_failed(link);
	43	}
	44
6cf4a01c	45	if (link->dhcp4_messages == 0) {
3c9b8860	46	link->dhcp4_configured = true;
8012cd39	47	link_check_ready(link);
3c9b8860 TG	48	}
	49
	50	return 1;
	51	}
	52
	53	static int link_set_dhcp_routes(Link *link) {
	54	struct in_addr gateway;
f8693fc7	55	_cleanup_free_ sd_dhcp_route **static_routes = NULL;
3c9b8860 TG	56	int r, n, i;
	57
	58	assert(link);
	59	assert(link->dhcp_lease);
964b26fe SS	60	assert(link->network);
	61
	62	if (!link->network->dhcp_use_routes)
	63	return 0;
3c9b8860 TG	64
3c9b8860 TG	65	r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
397d15fd	66	if (r < 0 && r != -ENODATA)
f6b8196f LP	67	return log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m");
f6b8196f LP	68
3c9b8860	69	if (r >= 0) {
46b0c76e	70	struct in_addr address;
3c9b8860 TG	71	_cleanup_route_free_ Route *route = NULL;
	72	_cleanup_route_free_ Route *route_gw = NULL;
	73
46b0c76e	74	r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
f6b8196f LP	75	if (r < 0)
f6b8196f LP	76	return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");
46b0c76e	77
ed9e361a	78	r = route_new(&route);
f6b8196f LP	79	if (r < 0)
f6b8196f LP	80	return log_link_error_errno(link, r, "Could not allocate route: %m");
3c9b8860	81
ed9e361a TG	82	route->protocol = RTPROT_DHCP;
	83
	84	r = route_new(&route_gw);
f6b8196f LP	85	if (r < 0)
f6b8196f LP	86	return log_link_error_errno(link, r, "Could not allocate route: %m");
3c9b8860 TG	87
	88	/* The dhcp netmask may mask out the gateway. Add an explicit
	89	* route for the gw host so that we can route no matter the
	90	* netmask or existing kernel route tables. */
	91	route_gw->family = AF_INET;
2ce40956	92	route_gw->dst.in = gateway;
3c9b8860	93	route_gw->dst_prefixlen = 32;
2ce40956	94	route_gw->prefsrc.in = address;
3c9b8860	95	route_gw->scope = RT_SCOPE_LINK;
ed9e361a	96	route_gw->protocol = RTPROT_DHCP;
86655331	97	route_gw->priority = link->network->dhcp_route_metric;
3c9b8860 TG	98
3c9b8860 TG	99	r = route_configure(route_gw, link, &dhcp4_route_handler);
f6b8196f LP	100	if (r < 0)
f6b8196f LP	101	return log_link_warning_errno(link, r, "Could not set host route: %m");
3c9b8860	102
313cefa1	103	link->dhcp4_messages++;
3c9b8860 TG	104
3c9b8860 TG	105	route->family = AF_INET;
2ce40956 TG	106	route->gw.in = gateway;
2ce40956 TG	107	route->prefsrc.in = address;
86655331	108	route->priority = link->network->dhcp_route_metric;
3c9b8860 TG	109
	110	r = route_configure(route, link, &dhcp4_route_handler);
	111	if (r < 0) {
f6b8196f	112	log_link_warning_errno(link, r, "Could not set routes: %m");
3c9b8860 TG	113	link_enter_failed(link);
	114	return r;
	115	}
	116
313cefa1	117	link->dhcp4_messages++;
3c9b8860 TG	118	}
	119
	120	n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
397d15fd	121	if (n == -ENODATA)
3c9b8860	122	return 0;
f6b8196f LP	123	if (n < 0)
f6b8196f LP	124	return log_link_warning_errno(link, n, "DHCP error: could not get routes: %m");
3c9b8860 TG	125
	126	for (i = 0; i < n; i++) {
	127	_cleanup_route_free_ Route *route = NULL;
	128
ed9e361a	129	r = route_new(&route);
f6b8196f LP	130	if (r < 0)
f6b8196f LP	131	return log_link_error_errno(link, r, "Could not allocate route: %m");
3c9b8860 TG	132
3c9b8860 TG	133	route->family = AF_INET;
ed9e361a	134	route->protocol = RTPROT_DHCP;
f8693fc7 BG	135	assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0);
	136	assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0);
	137	assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0);
86655331	138	route->priority = link->network->dhcp_route_metric;
3c9b8860 TG	139
3c9b8860 TG	140	r = route_configure(route, link, &dhcp4_route_handler);
f6b8196f LP	141	if (r < 0)
f6b8196f LP	142	return log_link_warning_errno(link, r, "Could not set host route: %m");
3c9b8860	143
313cefa1	144	link->dhcp4_messages++;
3c9b8860 TG	145	}
	146
	147	return 0;
	148	}
	149
	150	static int dhcp_lease_lost(Link *link) {
	151	_cleanup_address_free_ Address *address = NULL;
	152	struct in_addr addr;
	153	struct in_addr netmask;
	154	struct in_addr gateway;
f414a269	155	unsigned prefixlen = 0;
3c9b8860 TG	156	int r;
	157
	158	assert(link);
	159	assert(link->dhcp_lease);
	160
79008bdd	161	log_link_warning(link, "DHCP lease lost");
3c9b8860	162
27cb34f5	163	if (link->network->dhcp_use_routes) {
f8693fc7	164	_cleanup_free_ sd_dhcp_route **routes = NULL;
3c9b8860 TG	165	int n, i;
	166
	167	n = sd_dhcp_lease_get_routes(link->dhcp_lease, &routes);
	168	if (n >= 0) {
	169	for (i = 0; i < n; i++) {
	170	_cleanup_route_free_ Route *route = NULL;
	171
ed9e361a	172	r = route_new(&route);
3c9b8860 TG	173	if (r >= 0) {
3c9b8860 TG	174	route->family = AF_INET;
f8693fc7 BG	175	assert_se(sd_dhcp_route_get_gateway(routes[i], &route->gw.in) >= 0);
	176	assert_se(sd_dhcp_route_get_destination(routes[i], &route->dst.in) >= 0);
	177	assert_se(sd_dhcp_route_get_destination_prefix_length(routes[i], &route->dst_prefixlen) >= 0);
3c9b8860	178
91b5f997 TG	179	route_remove(route, link,
91b5f997 TG	180	&link_route_remove_handler);
3c9b8860 TG	181	}
	182	}
	183	}
	184	}
	185
f0213e37	186	r = address_new(&address);
3c9b8860 TG	187	if (r >= 0) {
	188	r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
	189	if (r >= 0) {
	190	_cleanup_route_free_ Route *route_gw = NULL;
	191	_cleanup_route_free_ Route *route = NULL;
	192
ed9e361a	193	r = route_new(&route_gw);
3c9b8860 TG	194	if (r >= 0) {
3c9b8860 TG	195	route_gw->family = AF_INET;
2ce40956	196	route_gw->dst.in = gateway;
3c9b8860 TG	197	route_gw->dst_prefixlen = 32;
	198	route_gw->scope = RT_SCOPE_LINK;
	199
91b5f997 TG	200	route_remove(route_gw, link,
91b5f997 TG	201	&link_route_remove_handler);
3c9b8860 TG	202	}
3c9b8860 TG	203
ed9e361a	204	r = route_new(&route);
3c9b8860 TG	205	if (r >= 0) {
3c9b8860 TG	206	route->family = AF_INET;
2ce40956	207	route->gw.in = gateway;
3c9b8860	208
91b5f997 TG	209	route_remove(route, link,
91b5f997 TG	210	&link_route_remove_handler);
3c9b8860 TG	211	}
	212	}
	213
f414a269 TG	214	r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
	215	if (r >= 0) {
	216	r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
	217	if (r >= 0)
	218	prefixlen = in_addr_netmask_to_prefixlen(&netmask);
3c9b8860	219
f414a269 TG	220	address->family = AF_INET;
	221	address->in_addr.in = addr;
	222	address->prefixlen = prefixlen;
3c9b8860	223
91b5f997	224	address_remove(address, link, &link_address_remove_handler);
f414a269	225	}
3c9b8860 TG	226	}
3c9b8860 TG	227
27cb34f5	228	if (link->network->dhcp_use_mtu) {
3c9b8860 TG	229	uint16_t mtu;
	230
	231	r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
	232	if (r >= 0 && link->original_mtu != mtu) {
	233	r = link_set_mtu(link, link->original_mtu);
	234	if (r < 0) {
79008bdd	235	log_link_warning(link,
3c9b8860 TG	236	"DHCP error: could not reset MTU");
	237	link_enter_failed(link);
	238	return r;
	239	}
	240	}
	241	}
	242
27cb34f5	243	if (link->network->dhcp_use_hostname) {
3c9b8860 TG	244	const char *hostname = NULL;
3c9b8860 TG	245
27cb34f5 LP	246	if (link->network->dhcp_hostname)
27cb34f5 LP	247	hostname = link->network->dhcp_hostname;
dce391e7 LP	248	else
dce391e7 LP	249	(void) sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
a7d0ef44	250
dce391e7 LP	251	if (hostname) {
	252	/* If a hostname was set due to the lease, then unset it now. */
	253	r = link_set_hostname(link, NULL);
3c9b8860	254	if (r < 0)
dce391e7	255	log_link_warning_errno(link, r, "Failed to reset transient hostname: %m");
3c9b8860 TG	256	}
	257	}
	258
	259	link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
6a3e5f6a	260	link_dirty(link);
3c9b8860 TG	261	link->dhcp4_configured = false;
	262
	263	return 0;
	264	}
	265
1c4baffc	266	static int dhcp4_address_handler(sd_netlink rtnl, sd_netlink_message m,
3c9b8860 TG	267	void *userdata) {
	268	_cleanup_link_unref_ Link *link = userdata;
	269	int r;
	270
	271	assert(link);
	272
1c4baffc	273	r = sd_netlink_message_get_errno(m);
3c9b8860	274	if (r < 0 && r != -EEXIST) {
f6b8196f	275	log_link_error_errno(link, r, "Could not set DHCPv4 address: %m");
3c9b8860	276	link_enter_failed(link);
45af44d4	277	} else if (r >= 0)
200a0868	278	manager_rtnl_process_address(rtnl, m, link->manager);
3c9b8860 TG	279
	280	link_set_dhcp_routes(link);
	281
	282	return 1;
	283	}
	284
	285	static int dhcp4_update_address(Link *link,
	286	struct in_addr *address,
	287	struct in_addr *netmask,
	288	uint32_t lifetime) {
	289	_cleanup_address_free_ Address *addr = NULL;
	290	unsigned prefixlen;
	291	int r;
	292
	293	assert(address);
	294	assert(netmask);
	295	assert(lifetime);
	296
	297	prefixlen = in_addr_netmask_to_prefixlen(netmask);
	298
f0213e37	299	r = address_new(&addr);
3c9b8860 TG	300	if (r < 0)
	301	return r;
	302
	303	addr->family = AF_INET;
	304	addr->in_addr.in.s_addr = address->s_addr;
	305	addr->cinfo.ifa_prefered = lifetime;
	306	addr->cinfo.ifa_valid = lifetime;
	307	addr->prefixlen = prefixlen;
	308	addr->broadcast.s_addr = address->s_addr \| ~netmask->s_addr;
	309
66669078 TG	310	/* allow reusing an existing address and simply update its lifetime
	311	* in case it already exists */
	312	r = address_configure(addr, link, &dhcp4_address_handler, true);
3c9b8860 TG	313	if (r < 0)
	314	return r;
	315
	316	return 0;
	317	}
	318
	319	static int dhcp_lease_renew(sd_dhcp_client client, Link link) {
	320	sd_dhcp_lease *lease;
	321	struct in_addr address;
	322	struct in_addr netmask;
	323	uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
	324	int r;
	325
	326	assert(link);
	327	assert(client);
	328	assert(link->network);
	329
	330	r = sd_dhcp_client_get_lease(client, &lease);
f6b8196f LP	331	if (r < 0)
f6b8196f LP	332	return log_link_warning_errno(link, r, "DHCP error: no lease: %m");
3c9b8860 TG	333
	334	sd_dhcp_lease_unref(link->dhcp_lease);
	335	link->dhcp4_configured = false;
e6b18ffa	336	link->dhcp_lease = sd_dhcp_lease_ref(lease);
6a3e5f6a	337	link_dirty(link);
3c9b8860 TG	338
3c9b8860 TG	339	r = sd_dhcp_lease_get_address(lease, &address);
f6b8196f LP	340	if (r < 0)
f6b8196f LP	341	return log_link_warning_errno(link, r, "DHCP error: no address: %m");
3c9b8860 TG	342
3c9b8860 TG	343	r = sd_dhcp_lease_get_netmask(lease, &netmask);
f6b8196f LP	344	if (r < 0)
f6b8196f LP	345	return log_link_warning_errno(link, r, "DHCP error: no netmask: %m");
3c9b8860 TG	346
3c9b8860 TG	347	if (!link->network->dhcp_critical) {
f6b8196f LP	348	r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
	349	if (r < 0)
	350	return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
3c9b8860 TG	351	}
	352
	353	r = dhcp4_update_address(link, &address, &netmask, lifetime);
	354	if (r < 0) {
f6b8196f	355	log_link_warning_errno(link, r, "Could not update IP address: %m");
3c9b8860 TG	356	link_enter_failed(link);
	357	return r;
	358	}
	359
	360	return 0;
	361	}
	362
	363	static int dhcp_lease_acquired(sd_dhcp_client client, Link link) {
	364	sd_dhcp_lease *lease;
	365	struct in_addr address;
	366	struct in_addr netmask;
	367	struct in_addr gateway;
	368	unsigned prefixlen;
	369	uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
	370	int r;
	371
	372	assert(client);
	373	assert(link);
	374
	375	r = sd_dhcp_client_get_lease(client, &lease);
f2341e0a	376	if (r < 0)
f6b8196f	377	return log_link_error_errno(link, r, "DHCP error: No lease: %m");
3c9b8860 TG	378
3c9b8860 TG	379	r = sd_dhcp_lease_get_address(lease, &address);
f2341e0a	380	if (r < 0)
f6b8196f	381	return log_link_error_errno(link, r, "DHCP error: No address: %m");
3c9b8860 TG	382
3c9b8860 TG	383	r = sd_dhcp_lease_get_netmask(lease, &netmask);
f2341e0a	384	if (r < 0)
f6b8196f	385	return log_link_error_errno(link, r, "DHCP error: No netmask: %m");
3c9b8860 TG	386
	387	prefixlen = in_addr_netmask_to_prefixlen(&netmask);
	388
	389	r = sd_dhcp_lease_get_router(lease, &gateway);
397d15fd	390	if (r < 0 && r != -ENODATA)
f6b8196f	391	return log_link_error_errno(link, r, "DHCP error: Could not get gateway: %m");
3c9b8860 TG	392
3c9b8860 TG	393	if (r >= 0)
f2341e0a LP	394	log_struct(LOG_INFO,
	395	LOG_LINK_INTERFACE(link),
	396	LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
	397	ADDRESS_FMT_VAL(address),
	398	prefixlen,
	399	ADDRESS_FMT_VAL(gateway)),
	400	"ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
	401	"PREFIXLEN=%u", prefixlen,
	402	"GATEWAY=%u.%u.%u.%u", ADDRESS_FMT_VAL(gateway),
	403	NULL);
3c9b8860	404	else
f2341e0a LP	405	log_struct(LOG_INFO,
	406	LOG_LINK_INTERFACE(link),
	407	LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u",
	408	ADDRESS_FMT_VAL(address),
	409	prefixlen),
	410	"ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
	411	"PREFIXLEN=%u", prefixlen,
	412	NULL);
3c9b8860	413
e6b18ffa	414	link->dhcp_lease = sd_dhcp_lease_ref(lease);
6a3e5f6a	415	link_dirty(link);
3c9b8860	416
27cb34f5	417	if (link->network->dhcp_use_mtu) {
3c9b8860 TG	418	uint16_t mtu;
	419
	420	r = sd_dhcp_lease_get_mtu(lease, &mtu);
	421	if (r >= 0) {
	422	r = link_set_mtu(link, mtu);
	423	if (r < 0)
f2341e0a	424	log_link_error_errno(link, r, "Failed to set MTU to %" PRIu16 ": %m", mtu);
3c9b8860 TG	425	}
	426	}
	427
27cb34f5	428	if (link->network->dhcp_use_hostname) {
49f6e11e	429	const char *hostname = NULL;
3c9b8860	430
27cb34f5 LP	431	if (link->network->dhcp_hostname)
27cb34f5 LP	432	hostname = link->network->dhcp_hostname;
dce391e7 LP	433	else
dce391e7 LP	434	(void) sd_dhcp_lease_get_hostname(lease, &hostname);
a7d0ef44	435
dce391e7	436	if (hostname) {
3c9b8860 TG	437	r = link_set_hostname(link, hostname);
3c9b8860 TG	438	if (r < 0)
f2341e0a	439	log_link_error_errno(link, r, "Failed to set transient hostname to '%s': %m", hostname);
3c9b8860 TG	440	}
	441	}
	442
27cb34f5	443	if (link->network->dhcp_use_timezone) {
21b80ad1 LP	444	const char *tz = NULL;
	445
	446	(void) sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
	447
	448	if (tz) {
	449	r = link_set_timezone(link, tz);
	450	if (r < 0)
	451	log_link_error_errno(link, r, "Failed to set timezone to '%s': %m", tz);
	452	}
	453	}
	454
3c9b8860	455	if (!link->network->dhcp_critical) {
f2341e0a	456	r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
3c9b8860	457	if (r < 0) {
f2341e0a	458	log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
3c9b8860 TG	459	return r;
	460	}
	461	}
	462
	463	r = dhcp4_update_address(link, &address, &netmask, lifetime);
	464	if (r < 0) {
f2341e0a	465	log_link_warning_errno(link, r, "Could not update IP address: %m");
3c9b8860 TG	466	link_enter_failed(link);
	467	return r;
	468	}
	469
	470	return 0;
	471	}
	472	static void dhcp4_handler(sd_dhcp_client client, int event, void userdata) {
	473	Link *link = userdata;
	474	int r = 0;
	475
	476	assert(link);
	477	assert(link->network);
	478	assert(link->manager);
	479
	480	if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
	481	return;
	482
	483	switch (event) {
03748142 DH	484	case SD_DHCP_CLIENT_EVENT_EXPIRED:
	485	case SD_DHCP_CLIENT_EVENT_STOP:
	486	case SD_DHCP_CLIENT_EVENT_IP_CHANGE:
3c9b8860	487	if (link->network->dhcp_critical) {
f6b8196f	488	log_link_error(link, "DHCPv4 connection considered system critical, ignoring request to reconfigure it.");
3c9b8860 TG	489	return;
	490	}
	491
	492	if (link->dhcp_lease) {
	493	r = dhcp_lease_lost(link);
	494	if (r < 0) {
	495	link_enter_failed(link);
	496	return;
	497	}
	498	}
	499
03748142	500	if (event == SD_DHCP_CLIENT_EVENT_IP_CHANGE) {
3c9b8860 TG	501	r = dhcp_lease_acquired(client, link);
	502	if (r < 0) {
	503	link_enter_failed(link);
	504	return;
	505	}
	506	}
	507
	508	break;
03748142	509	case SD_DHCP_CLIENT_EVENT_RENEW:
3c9b8860 TG	510	r = dhcp_lease_renew(client, link);
	511	if (r < 0) {
	512	link_enter_failed(link);
	513	return;
	514	}
	515	break;
03748142	516	case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE:
3c9b8860 TG	517	r = dhcp_lease_acquired(client, link);
	518	if (r < 0) {
	519	link_enter_failed(link);
	520	return;
	521	}
	522	break;
	523	default:
	524	if (event < 0)
f6b8196f	525	log_link_warning_errno(link, event, "DHCP error: Client failed: %m");
3c9b8860	526	else
f6b8196f	527	log_link_warning(link, "DHCP unknown event: %i", event);
3c9b8860 TG	528	break;
	529	}
	530
	531	return;
	532	}
	533
	534	int dhcp4_configure(Link *link) {
	535	int r;
	536
	537	assert(link);
	538	assert(link->network);
e0ee46f2	539	assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
3c9b8860	540
0bc70f1d TG	541	if (!link->dhcp_client) {
	542	r = sd_dhcp_client_new(&link->dhcp_client);
	543	if (r < 0)
	544	return r;
	545	}
3c9b8860 TG	546
	547	r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
	548	if (r < 0)
	549	return r;
	550
76253e73 DW	551	r = sd_dhcp_client_set_mac(link->dhcp_client,
	552	(const uint8_t *) &link->mac,
	553	sizeof (link->mac), ARPHRD_ETHER);
3c9b8860 TG	554	if (r < 0)
	555	return r;
	556
	557	r = sd_dhcp_client_set_index(link->dhcp_client, link->ifindex);
	558	if (r < 0)
	559	return r;
	560
	561	r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link);
	562	if (r < 0)
	563	return r;
	564
	565	r = sd_dhcp_client_set_request_broadcast(link->dhcp_client,
	566	link->network->dhcp_broadcast);
	567	if (r < 0)
	568	return r;
	569
	570	if (link->mtu) {
	571	r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
	572	if (r < 0)
	573	return r;
	574	}
	575
27cb34f5	576	if (link->network->dhcp_use_mtu) {
39745a5a	577	r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92	578	SD_DHCP_OPTION_INTERFACE_MTU);
39745a5a LP	579	if (r < 0)
39745a5a LP	580	return r;
3c9b8860 TG	581	}
3c9b8860 TG	582
27cb34f5	583	if (link->network->dhcp_use_routes) {
3c9b8860	584	r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92	585	SD_DHCP_OPTION_STATIC_ROUTE);
3c9b8860 TG	586	if (r < 0)
	587	return r;
	588	r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92	589	SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE);
7d6884b6 TA	590	if (r < 0)
7d6884b6 TA	591	return r;
3c9b8860 TG	592	}
3c9b8860 TG	593
27cb34f5	594	/* Always acquire the timezone and NTP */
22805d92	595	r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NTP_SERVER);
4b7b5abb LP	596	if (r < 0)
	597	return r;
	598
22805d92	599	r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NEW_TZDB_TIMEZONE);
8eb9058d LP	600	if (r < 0)
	601	return r;
	602
27cb34f5	603	if (link->network->dhcp_send_hostname) {
3c9b8860	604	_cleanup_free_ char *hostname = NULL;
a7d0ef44 SS	605	const char *hn = NULL;
a7d0ef44 SS	606
27cb34f5	607	if (!link->network->dhcp_hostname) {
a7d0ef44 SS	608	hostname = gethostname_malloc();
	609	if (!hostname)
	610	return -ENOMEM;
3c9b8860	611
a7d0ef44 SS	612	hn = hostname;
a7d0ef44 SS	613	} else
27cb34f5	614	hn = link->network->dhcp_hostname;
3c9b8860	615
a7d0ef44 SS	616	if (!is_localhost(hn)) {
a7d0ef44 SS	617	r = sd_dhcp_client_set_hostname(link->dhcp_client, hn);
3c9b8860 TG	618	if (r < 0)
	619	return r;
	620	}
	621	}
	622
	623	if (link->network->dhcp_vendor_class_identifier) {
	624	r = sd_dhcp_client_set_vendor_class_identifier(link->dhcp_client,
	625	link->network->dhcp_vendor_class_identifier);
	626	if (r < 0)
	627	return r;
	628	}
	629
3e43b2cd	630	switch (link->network->dhcp_client_identifier) {
8341a5c3	631	case DHCP_CLIENT_ID_DUID: {
413708d1	632	/* If configured, apply user specified DUID and/or IAID */
8341a5c3 ZJS	633	const DUID *duid = link_duid(link);
	634
	635	r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
	636	link->network->iaid,
	637	duid->type,
	638	duid->raw_data_len > 0 ? duid->raw_data : NULL,
	639	duid->raw_data_len);
413708d1 VK	640	if (r < 0)
413708d1 VK	641	return r;
3e43b2cd	642	break;
8341a5c3	643	}
3e43b2cd JJ	644	case DHCP_CLIENT_ID_MAC:
	645	r = sd_dhcp_client_set_client_id(link->dhcp_client,
	646	ARPHRD_ETHER,
	647	(const uint8_t *) &link->mac,
8341a5c3	648	sizeof(link->mac));
3e43b2cd JJ	649	if (r < 0)
	650	return r;
	651	break;
	652	default:
	653	assert_not_reached("Unknown client identifier type.");
	654	}
	655
3c9b8860 TG	656	return 0;
3c9b8860 TG	657	}