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-rw-r--r--src/libsystemd-network/sd-dhcp6-client.c1516
1 files changed, 1516 insertions, 0 deletions
diff --git a/src/libsystemd-network/sd-dhcp6-client.c b/src/libsystemd-network/sd-dhcp6-client.c
new file mode 100644
index 0000000..593ffd1
--- /dev/null
+++ b/src/libsystemd-network/sd-dhcp6-client.c
@@ -0,0 +1,1516 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+/***
+ Copyright © 2014-2015 Intel Corporation. All rights reserved.
+***/
+
+#include <errno.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <linux/if_infiniband.h>
+
+#include "sd-dhcp6-client.h"
+
+#include "alloc-util.h"
+#include "dhcp-identifier.h"
+#include "dhcp6-internal.h"
+#include "dhcp6-lease-internal.h"
+#include "dhcp6-protocol.h"
+#include "dns-domain.h"
+#include "event-util.h"
+#include "fd-util.h"
+#include "hostname-util.h"
+#include "in-addr-util.h"
+#include "network-internal.h"
+#include "random-util.h"
+#include "socket-util.h"
+#include "string-table.h"
+#include "util.h"
+
+#define MAX_MAC_ADDR_LEN INFINIBAND_ALEN
+
+/* what to request from the server, addresses (IA_NA) and/or prefixes (IA_PD) */
+enum {
+ DHCP6_REQUEST_IA_NA = 1,
+ DHCP6_REQUEST_IA_TA = 2, /* currently not used */
+ DHCP6_REQUEST_IA_PD = 4,
+};
+
+struct sd_dhcp6_client {
+ unsigned n_ref;
+
+ enum DHCP6State state;
+ sd_event *event;
+ int event_priority;
+ int ifindex;
+ struct in6_addr local_address;
+ uint8_t mac_addr[MAX_MAC_ADDR_LEN];
+ size_t mac_addr_len;
+ uint16_t arp_type;
+ DHCP6IA ia_na;
+ DHCP6IA ia_pd;
+ sd_event_source *timeout_t1;
+ sd_event_source *timeout_t2;
+ unsigned request;
+ be32_t transaction_id;
+ usec_t transaction_start;
+ struct sd_dhcp6_lease *lease;
+ int fd;
+ bool information_request;
+ bool iaid_set;
+ be16_t *req_opts;
+ size_t req_opts_allocated;
+ size_t req_opts_len;
+ char *fqdn;
+ sd_event_source *receive_message;
+ usec_t retransmit_time;
+ uint8_t retransmit_count;
+ sd_event_source *timeout_resend;
+ sd_event_source *timeout_resend_expire;
+ sd_dhcp6_client_callback_t callback;
+ void *userdata;
+ struct duid duid;
+ size_t duid_len;
+};
+
+static const uint16_t default_req_opts[] = {
+ SD_DHCP6_OPTION_DNS_SERVERS,
+ SD_DHCP6_OPTION_DOMAIN_LIST,
+ SD_DHCP6_OPTION_NTP_SERVER,
+ SD_DHCP6_OPTION_SNTP_SERVERS,
+};
+
+const char * dhcp6_message_type_table[_DHCP6_MESSAGE_MAX] = {
+ [DHCP6_SOLICIT] = "SOLICIT",
+ [DHCP6_ADVERTISE] = "ADVERTISE",
+ [DHCP6_REQUEST] = "REQUEST",
+ [DHCP6_CONFIRM] = "CONFIRM",
+ [DHCP6_RENEW] = "RENEW",
+ [DHCP6_REBIND] = "REBIND",
+ [DHCP6_REPLY] = "REPLY",
+ [DHCP6_RELEASE] = "RELEASE",
+ [DHCP6_DECLINE] = "DECLINE",
+ [DHCP6_RECONFIGURE] = "RECONFIGURE",
+ [DHCP6_INFORMATION_REQUEST] = "INFORMATION-REQUEST",
+ [DHCP6_RELAY_FORW] = "RELAY-FORW",
+ [DHCP6_RELAY_REPL] = "RELAY-REPL",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(dhcp6_message_type, int);
+
+const char * dhcp6_message_status_table[_DHCP6_STATUS_MAX] = {
+ [DHCP6_STATUS_SUCCESS] = "Success",
+ [DHCP6_STATUS_UNSPEC_FAIL] = "Unspecified failure",
+ [DHCP6_STATUS_NO_ADDRS_AVAIL] = "No addresses available",
+ [DHCP6_STATUS_NO_BINDING] = "Binding unavailable",
+ [DHCP6_STATUS_NOT_ON_LINK] = "Not on link",
+ [DHCP6_STATUS_USE_MULTICAST] = "Use multicast",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(dhcp6_message_status, int);
+
+#define DHCP6_CLIENT_DONT_DESTROY(client) \
+ _cleanup_(sd_dhcp6_client_unrefp) _unused_ sd_dhcp6_client *_dont_destroy_##client = sd_dhcp6_client_ref(client)
+
+static int client_start(sd_dhcp6_client *client, enum DHCP6State state);
+
+int sd_dhcp6_client_set_callback(
+ sd_dhcp6_client *client,
+ sd_dhcp6_client_callback_t cb,
+ void *userdata) {
+
+ assert_return(client, -EINVAL);
+
+ client->callback = cb;
+ client->userdata = userdata;
+
+ return 0;
+}
+
+int sd_dhcp6_client_set_ifindex(sd_dhcp6_client *client, int ifindex) {
+
+ assert_return(client, -EINVAL);
+ assert_return(ifindex >= -1, -EINVAL);
+ assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY);
+
+ client->ifindex = ifindex;
+ return 0;
+}
+
+int sd_dhcp6_client_set_local_address(
+ sd_dhcp6_client *client,
+ const struct in6_addr *local_address) {
+
+ assert_return(client, -EINVAL);
+ assert_return(local_address, -EINVAL);
+ assert_return(in_addr_is_link_local(AF_INET6, (const union in_addr_union *) local_address) > 0, -EINVAL);
+
+ assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY);
+
+ client->local_address = *local_address;
+
+ return 0;
+}
+
+int sd_dhcp6_client_set_mac(
+ sd_dhcp6_client *client,
+ const uint8_t *addr, size_t addr_len,
+ uint16_t arp_type) {
+
+ assert_return(client, -EINVAL);
+ assert_return(addr, -EINVAL);
+ assert_return(addr_len > 0 && addr_len <= MAX_MAC_ADDR_LEN, -EINVAL);
+ assert_return(arp_type > 0, -EINVAL);
+
+ assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY);
+
+ if (arp_type == ARPHRD_ETHER)
+ assert_return(addr_len == ETH_ALEN, -EINVAL);
+ else if (arp_type == ARPHRD_INFINIBAND)
+ assert_return(addr_len == INFINIBAND_ALEN, -EINVAL);
+ else
+ return -EINVAL;
+
+ if (client->mac_addr_len == addr_len &&
+ memcmp(&client->mac_addr, addr, addr_len) == 0)
+ return 0;
+
+ memcpy(&client->mac_addr, addr, addr_len);
+ client->mac_addr_len = addr_len;
+ client->arp_type = arp_type;
+
+ return 0;
+}
+
+static int client_ensure_duid(sd_dhcp6_client *client) {
+ if (client->duid_len != 0)
+ return 0;
+
+ return dhcp_identifier_set_duid_en(&client->duid, &client->duid_len);
+}
+
+/**
+ * Sets DUID. If duid is non-null, the DUID is set to duid_type + duid
+ * without further modification. Otherwise, if duid_type is supported, DUID
+ * is set based on that type. Otherwise, an error is returned.
+ */
+static int dhcp6_client_set_duid_internal(
+ sd_dhcp6_client *client,
+ uint16_t duid_type,
+ const void *duid,
+ size_t duid_len,
+ usec_t llt_time) {
+ int r;
+
+ assert_return(client, -EINVAL);
+ assert_return(duid_len == 0 || duid != NULL, -EINVAL);
+ assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY);
+
+ if (duid != NULL) {
+ r = dhcp_validate_duid_len(duid_type, duid_len, true);
+ if (r < 0) {
+ r = dhcp_validate_duid_len(duid_type, duid_len, false);
+ if (r < 0)
+ return r;
+ log_dhcp6_client(client, "Setting DUID of type %u with unexpected content", duid_type);
+ }
+
+ client->duid.type = htobe16(duid_type);
+ memcpy(&client->duid.raw.data, duid, duid_len);
+ client->duid_len = sizeof(client->duid.type) + duid_len;
+ } else
+ switch (duid_type) {
+ case DUID_TYPE_LLT:
+ if (client->mac_addr_len == 0)
+ return -EOPNOTSUPP;
+
+ r = dhcp_identifier_set_duid_llt(&client->duid, llt_time, client->mac_addr, client->mac_addr_len, client->arp_type, &client->duid_len);
+ if (r < 0)
+ return r;
+ break;
+ case DUID_TYPE_EN:
+ r = dhcp_identifier_set_duid_en(&client->duid, &client->duid_len);
+ if (r < 0)
+ return r;
+ break;
+ case DUID_TYPE_LL:
+ if (client->mac_addr_len == 0)
+ return -EOPNOTSUPP;
+
+ r = dhcp_identifier_set_duid_ll(&client->duid, client->mac_addr, client->mac_addr_len, client->arp_type, &client->duid_len);
+ if (r < 0)
+ return r;
+ break;
+ case DUID_TYPE_UUID:
+ r = dhcp_identifier_set_duid_uuid(&client->duid, &client->duid_len);
+ if (r < 0)
+ return r;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int sd_dhcp6_client_set_duid(
+ sd_dhcp6_client *client,
+ uint16_t duid_type,
+ const void *duid,
+ size_t duid_len) {
+ return dhcp6_client_set_duid_internal(client, duid_type, duid, duid_len, 0);
+}
+
+int sd_dhcp6_client_set_duid_llt(
+ sd_dhcp6_client *client,
+ usec_t llt_time) {
+ return dhcp6_client_set_duid_internal(client, DUID_TYPE_LLT, NULL, 0, llt_time);
+}
+
+int sd_dhcp6_client_set_iaid(sd_dhcp6_client *client, uint32_t iaid) {
+ assert_return(client, -EINVAL);
+ assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY);
+
+ client->ia_na.ia_na.id = htobe32(iaid);
+ client->ia_pd.ia_pd.id = htobe32(iaid);
+ client->iaid_set = true;
+
+ return 0;
+}
+
+int sd_dhcp6_client_set_fqdn(
+ sd_dhcp6_client *client,
+ const char *fqdn) {
+
+ assert_return(client, -EINVAL);
+
+ /* Make sure FQDN qualifies as DNS and as Linux hostname */
+ if (fqdn &&
+ !(hostname_is_valid(fqdn, false) && dns_name_is_valid(fqdn) > 0))
+ return -EINVAL;
+
+ return free_and_strdup(&client->fqdn, fqdn);
+}
+
+int sd_dhcp6_client_set_information_request(sd_dhcp6_client *client, int enabled) {
+ assert_return(client, -EINVAL);
+ assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY);
+
+ client->information_request = enabled;
+
+ return 0;
+}
+
+int sd_dhcp6_client_get_information_request(sd_dhcp6_client *client, int *enabled) {
+ assert_return(client, -EINVAL);
+ assert_return(enabled, -EINVAL);
+
+ *enabled = client->information_request;
+
+ return 0;
+}
+
+int sd_dhcp6_client_set_request_option(sd_dhcp6_client *client, uint16_t option) {
+ size_t t;
+
+ assert_return(client, -EINVAL);
+ assert_return(client->state == DHCP6_STATE_STOPPED, -EBUSY);
+
+ switch(option) {
+
+ case SD_DHCP6_OPTION_DNS_SERVERS:
+ case SD_DHCP6_OPTION_DOMAIN_LIST:
+ case SD_DHCP6_OPTION_SNTP_SERVERS:
+ case SD_DHCP6_OPTION_NTP_SERVER:
+ case SD_DHCP6_OPTION_RAPID_COMMIT:
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ for (t = 0; t < client->req_opts_len; t++)
+ if (client->req_opts[t] == htobe16(option))
+ return -EEXIST;
+
+ if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated,
+ client->req_opts_len + 1))
+ return -ENOMEM;
+
+ client->req_opts[client->req_opts_len++] = htobe16(option);
+
+ return 0;
+}
+
+int sd_dhcp6_client_get_prefix_delegation(sd_dhcp6_client *client, int *delegation) {
+ assert_return(client, -EINVAL);
+ assert_return(delegation, -EINVAL);
+
+ *delegation = FLAGS_SET(client->request, DHCP6_REQUEST_IA_PD);
+
+ return 0;
+}
+
+int sd_dhcp6_client_set_prefix_delegation(sd_dhcp6_client *client, int delegation) {
+ assert_return(client, -EINVAL);
+
+ SET_FLAG(client->request, DHCP6_REQUEST_IA_PD, delegation);
+
+ return 0;
+}
+
+int sd_dhcp6_client_get_address_request(sd_dhcp6_client *client, int *request) {
+ assert_return(client, -EINVAL);
+ assert_return(request, -EINVAL);
+
+ *request = FLAGS_SET(client->request, DHCP6_REQUEST_IA_NA);
+
+ return 0;
+}
+
+int sd_dhcp6_client_set_address_request(sd_dhcp6_client *client, int request) {
+ assert_return(client, -EINVAL);
+
+ SET_FLAG(client->request, DHCP6_REQUEST_IA_NA, request);
+
+ return 0;
+}
+
+int sd_dhcp6_client_set_transaction_id(sd_dhcp6_client *client, uint32_t transaction_id) {
+ assert_return(client, -EINVAL);
+
+ client->transaction_id = transaction_id;
+
+ return 0;
+}
+
+int sd_dhcp6_client_get_lease(sd_dhcp6_client *client, sd_dhcp6_lease **ret) {
+ assert_return(client, -EINVAL);
+
+ if (!client->lease)
+ return -ENOMSG;
+
+ if (ret)
+ *ret = client->lease;
+
+ return 0;
+}
+
+static void client_notify(sd_dhcp6_client *client, int event) {
+ assert(client);
+
+ if (client->callback)
+ client->callback(client, event, client->userdata);
+}
+
+static int client_reset(sd_dhcp6_client *client) {
+ assert(client);
+
+ client->lease = sd_dhcp6_lease_unref(client->lease);
+
+ client->receive_message =
+ sd_event_source_unref(client->receive_message);
+
+ client->transaction_id = 0;
+ client->transaction_start = 0;
+
+ client->retransmit_time = 0;
+ client->retransmit_count = 0;
+
+ (void) event_source_disable(client->timeout_resend);
+ (void) event_source_disable(client->timeout_resend_expire);
+ (void) event_source_disable(client->timeout_t1);
+ (void) event_source_disable(client->timeout_t2);
+
+ client->state = DHCP6_STATE_STOPPED;
+
+ return 0;
+}
+
+static void client_stop(sd_dhcp6_client *client, int error) {
+ DHCP6_CLIENT_DONT_DESTROY(client);
+
+ assert(client);
+
+ client_notify(client, error);
+
+ client_reset(client);
+}
+
+static int client_send_message(sd_dhcp6_client *client, usec_t time_now) {
+ _cleanup_free_ DHCP6Message *message = NULL;
+ struct in6_addr all_servers =
+ IN6ADDR_ALL_DHCP6_RELAY_AGENTS_AND_SERVERS_INIT;
+ size_t len, optlen = 512;
+ uint8_t *opt;
+ int r;
+ usec_t elapsed_usec;
+ be16_t elapsed_time;
+
+ assert(client);
+
+ len = sizeof(DHCP6Message) + optlen;
+
+ message = malloc0(len);
+ if (!message)
+ return -ENOMEM;
+
+ opt = (uint8_t *)(message + 1);
+
+ message->transaction_id = client->transaction_id;
+
+ switch(client->state) {
+ case DHCP6_STATE_INFORMATION_REQUEST:
+ message->type = DHCP6_INFORMATION_REQUEST;
+
+ break;
+
+ case DHCP6_STATE_SOLICITATION:
+ message->type = DHCP6_SOLICIT;
+
+ r = dhcp6_option_append(&opt, &optlen,
+ SD_DHCP6_OPTION_RAPID_COMMIT, 0, NULL);
+ if (r < 0)
+ return r;
+
+ if (FLAGS_SET(client->request, DHCP6_REQUEST_IA_NA)) {
+ r = dhcp6_option_append_ia(&opt, &optlen,
+ &client->ia_na);
+ if (r < 0)
+ return r;
+ }
+
+ if (client->fqdn) {
+ r = dhcp6_option_append_fqdn(&opt, &optlen, client->fqdn);
+ if (r < 0)
+ return r;
+ }
+
+ if (FLAGS_SET(client->request, DHCP6_REQUEST_IA_PD)) {
+ r = dhcp6_option_append_pd(opt, optlen, &client->ia_pd);
+ if (r < 0)
+ return r;
+
+ opt += r;
+ optlen -= r;
+ }
+
+ break;
+
+ case DHCP6_STATE_REQUEST:
+ case DHCP6_STATE_RENEW:
+
+ if (client->state == DHCP6_STATE_REQUEST)
+ message->type = DHCP6_REQUEST;
+ else
+ message->type = DHCP6_RENEW;
+
+ r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_SERVERID,
+ client->lease->serverid_len,
+ client->lease->serverid);
+ if (r < 0)
+ return r;
+
+ if (FLAGS_SET(client->request, DHCP6_REQUEST_IA_NA)) {
+ r = dhcp6_option_append_ia(&opt, &optlen,
+ &client->lease->ia);
+ if (r < 0)
+ return r;
+ }
+
+ if (client->fqdn) {
+ r = dhcp6_option_append_fqdn(&opt, &optlen, client->fqdn);
+ if (r < 0)
+ return r;
+ }
+
+ if (FLAGS_SET(client->request, DHCP6_REQUEST_IA_PD)) {
+ r = dhcp6_option_append_pd(opt, optlen, &client->lease->pd);
+ if (r < 0)
+ return r;
+
+ opt += r;
+ optlen -= r;
+ }
+
+ break;
+
+ case DHCP6_STATE_REBIND:
+ message->type = DHCP6_REBIND;
+
+ if (FLAGS_SET(client->request, DHCP6_REQUEST_IA_NA)) {
+ r = dhcp6_option_append_ia(&opt, &optlen, &client->lease->ia);
+ if (r < 0)
+ return r;
+ }
+
+ if (client->fqdn) {
+ r = dhcp6_option_append_fqdn(&opt, &optlen, client->fqdn);
+ if (r < 0)
+ return r;
+ }
+
+ if (FLAGS_SET(client->request, DHCP6_REQUEST_IA_PD)) {
+ r = dhcp6_option_append_pd(opt, optlen, &client->lease->pd);
+ if (r < 0)
+ return r;
+
+ opt += r;
+ optlen -= r;
+ }
+
+ break;
+
+ case DHCP6_STATE_STOPPED:
+ case DHCP6_STATE_BOUND:
+ return -EINVAL;
+ }
+
+ r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_ORO,
+ client->req_opts_len * sizeof(be16_t),
+ client->req_opts);
+ if (r < 0)
+ return r;
+
+ assert(client->duid_len);
+ r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_CLIENTID,
+ client->duid_len, &client->duid);
+ if (r < 0)
+ return r;
+
+ elapsed_usec = time_now - client->transaction_start;
+ if (elapsed_usec < 0xffff * USEC_PER_MSEC * 10)
+ elapsed_time = htobe16(elapsed_usec / USEC_PER_MSEC / 10);
+ else
+ elapsed_time = 0xffff;
+
+ r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_ELAPSED_TIME,
+ sizeof(elapsed_time), &elapsed_time);
+ if (r < 0)
+ return r;
+
+ r = dhcp6_network_send_udp_socket(client->fd, &all_servers, message,
+ len - optlen);
+ if (r < 0)
+ return r;
+
+ log_dhcp6_client(client, "Sent %s",
+ dhcp6_message_type_to_string(message->type));
+
+ return 0;
+}
+
+static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) {
+ sd_dhcp6_client *client = userdata;
+
+ assert(s);
+ assert(client);
+ assert(client->lease);
+
+ (void) event_source_disable(client->timeout_t2);
+
+ log_dhcp6_client(client, "Timeout T2");
+
+ client_start(client, DHCP6_STATE_REBIND);
+
+ return 0;
+}
+
+static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) {
+ sd_dhcp6_client *client = userdata;
+
+ assert(s);
+ assert(client);
+ assert(client->lease);
+
+ (void) event_source_disable(client->timeout_t1);
+
+ log_dhcp6_client(client, "Timeout T1");
+
+ client_start(client, DHCP6_STATE_RENEW);
+
+ return 0;
+}
+
+static int client_timeout_resend_expire(sd_event_source *s, uint64_t usec, void *userdata) {
+ sd_dhcp6_client *client = userdata;
+ DHCP6_CLIENT_DONT_DESTROY(client);
+ enum DHCP6State state;
+
+ assert(s);
+ assert(client);
+ assert(client->event);
+
+ state = client->state;
+
+ client_stop(client, SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE);
+
+ /* RFC 3315, section 18.1.4., says that "...the client may choose to
+ use a Solicit message to locate a new DHCP server..." */
+ if (state == DHCP6_STATE_REBIND)
+ client_start(client, DHCP6_STATE_SOLICITATION);
+
+ return 0;
+}
+
+static usec_t client_timeout_compute_random(usec_t val) {
+ return val - val / 10 +
+ (random_u32() % (2 * USEC_PER_SEC)) * val / 10 / USEC_PER_SEC;
+}
+
+static int client_timeout_resend(sd_event_source *s, uint64_t usec, void *userdata) {
+ int r = 0;
+ sd_dhcp6_client *client = userdata;
+ usec_t time_now, init_retransmit_time = 0, max_retransmit_time = 0;
+ usec_t max_retransmit_duration = 0;
+ uint8_t max_retransmit_count = 0;
+ char time_string[FORMAT_TIMESPAN_MAX];
+ uint32_t expire = 0;
+
+ assert(s);
+ assert(client);
+ assert(client->event);
+
+ (void) event_source_disable(client->timeout_resend);
+
+ switch (client->state) {
+ case DHCP6_STATE_INFORMATION_REQUEST:
+ init_retransmit_time = DHCP6_INF_TIMEOUT;
+ max_retransmit_time = DHCP6_INF_MAX_RT;
+
+ break;
+
+ case DHCP6_STATE_SOLICITATION:
+
+ if (client->retransmit_count && client->lease) {
+ client_start(client, DHCP6_STATE_REQUEST);
+ return 0;
+ }
+
+ init_retransmit_time = DHCP6_SOL_TIMEOUT;
+ max_retransmit_time = DHCP6_SOL_MAX_RT;
+
+ break;
+
+ case DHCP6_STATE_REQUEST:
+ init_retransmit_time = DHCP6_REQ_TIMEOUT;
+ max_retransmit_time = DHCP6_REQ_MAX_RT;
+ max_retransmit_count = DHCP6_REQ_MAX_RC;
+
+ break;
+
+ case DHCP6_STATE_RENEW:
+ init_retransmit_time = DHCP6_REN_TIMEOUT;
+ max_retransmit_time = DHCP6_REN_MAX_RT;
+
+ /* RFC 3315, section 18.1.3. says max retransmit duration will
+ be the remaining time until T2. Instead of setting MRD,
+ wait for T2 to trigger with the same end result */
+
+ break;
+
+ case DHCP6_STATE_REBIND:
+ init_retransmit_time = DHCP6_REB_TIMEOUT;
+ max_retransmit_time = DHCP6_REB_MAX_RT;
+
+ if (event_source_is_enabled(client->timeout_resend_expire) <= 0) {
+ r = dhcp6_lease_ia_rebind_expire(&client->lease->ia,
+ &expire);
+ if (r < 0) {
+ client_stop(client, r);
+ return 0;
+ }
+ max_retransmit_duration = expire * USEC_PER_SEC;
+ }
+
+ break;
+
+ case DHCP6_STATE_STOPPED:
+ case DHCP6_STATE_BOUND:
+ return 0;
+ }
+
+ if (max_retransmit_count &&
+ client->retransmit_count >= max_retransmit_count) {
+ client_stop(client, SD_DHCP6_CLIENT_EVENT_RETRANS_MAX);
+ return 0;
+ }
+
+ r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now);
+ if (r < 0)
+ goto error;
+
+ r = client_send_message(client, time_now);
+ if (r >= 0)
+ client->retransmit_count++;
+
+ if (!client->retransmit_time) {
+ client->retransmit_time =
+ client_timeout_compute_random(init_retransmit_time);
+
+ if (client->state == DHCP6_STATE_SOLICITATION)
+ client->retransmit_time += init_retransmit_time / 10;
+
+ } else {
+ if (max_retransmit_time &&
+ client->retransmit_time > max_retransmit_time / 2)
+ client->retransmit_time = client_timeout_compute_random(max_retransmit_time);
+ else
+ client->retransmit_time += client_timeout_compute_random(client->retransmit_time);
+ }
+
+ log_dhcp6_client(client, "Next retransmission in %s",
+ format_timespan(time_string, FORMAT_TIMESPAN_MAX, client->retransmit_time, USEC_PER_SEC));
+
+ r = event_reset_time(client->event, &client->timeout_resend,
+ clock_boottime_or_monotonic(),
+ time_now + client->retransmit_time, 10 * USEC_PER_MSEC,
+ client_timeout_resend, client,
+ client->event_priority, "dhcp6-resend-timer", true);
+ if (r < 0)
+ goto error;
+
+ if (max_retransmit_duration && event_source_is_enabled(client->timeout_resend_expire) <= 0) {
+
+ log_dhcp6_client(client, "Max retransmission duration %"PRIu64" secs",
+ max_retransmit_duration / USEC_PER_SEC);
+
+ r = event_reset_time(client->event, &client->timeout_resend_expire,
+ clock_boottime_or_monotonic(),
+ time_now + max_retransmit_duration, USEC_PER_SEC,
+ client_timeout_resend_expire, client,
+ client->event_priority, "dhcp6-resend-expire-timer", true);
+ if (r < 0)
+ goto error;
+ }
+
+error:
+ if (r < 0)
+ client_stop(client, r);
+
+ return 0;
+}
+
+static int client_ensure_iaid(sd_dhcp6_client *client) {
+ int r;
+ uint32_t iaid;
+
+ assert(client);
+
+ if (client->iaid_set)
+ return 0;
+
+ r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, client->mac_addr_len, true, &iaid);
+ if (r < 0)
+ return r;
+
+ client->ia_na.ia_na.id = iaid;
+ client->ia_pd.ia_pd.id = iaid;
+ client->iaid_set = true;
+
+ return 0;
+}
+
+static int client_parse_message(
+ sd_dhcp6_client *client,
+ DHCP6Message *message,
+ size_t len,
+ sd_dhcp6_lease *lease) {
+
+ uint32_t lt_t1 = ~0, lt_t2 = ~0;
+ bool clientid = false;
+ size_t pos = 0;
+ int r;
+
+ assert(client);
+ assert(message);
+ assert(len >= sizeof(DHCP6Message));
+ assert(lease);
+
+ len -= sizeof(DHCP6Message);
+
+ while (pos < len) {
+ DHCP6Option *option = (DHCP6Option *) &message->options[pos];
+ uint16_t optcode, optlen;
+ be32_t iaid_lease;
+ uint8_t *optval;
+ int status;
+
+ if (len < pos + offsetof(DHCP6Option, data))
+ return -ENOBUFS;
+
+ optcode = be16toh(option->code);
+ optlen = be16toh(option->len);
+ optval = option->data;
+
+ if (len < pos + offsetof(DHCP6Option, data) + optlen)
+ return -ENOBUFS;
+
+ switch (optcode) {
+ case SD_DHCP6_OPTION_CLIENTID:
+ if (clientid) {
+ log_dhcp6_client(client, "%s contains multiple clientids",
+ dhcp6_message_type_to_string(message->type));
+ return -EINVAL;
+ }
+
+ if (optlen != client->duid_len ||
+ memcmp(&client->duid, optval, optlen) != 0) {
+ log_dhcp6_client(client, "%s DUID does not match",
+ dhcp6_message_type_to_string(message->type));
+
+ return -EINVAL;
+ }
+ clientid = true;
+
+ break;
+
+ case SD_DHCP6_OPTION_SERVERID:
+ r = dhcp6_lease_get_serverid(lease, NULL, NULL);
+ if (r >= 0) {
+ log_dhcp6_client(client, "%s contains multiple serverids",
+ dhcp6_message_type_to_string(message->type));
+ return -EINVAL;
+ }
+
+ r = dhcp6_lease_set_serverid(lease, optval, optlen);
+ if (r < 0)
+ return r;
+
+ break;
+
+ case SD_DHCP6_OPTION_PREFERENCE:
+ if (optlen != 1)
+ return -EINVAL;
+
+ r = dhcp6_lease_set_preference(lease, optval[0]);
+ if (r < 0)
+ return r;
+
+ break;
+
+ case SD_DHCP6_OPTION_STATUS_CODE:
+ status = dhcp6_option_parse_status(option, optlen + sizeof(DHCP6Option));
+ if (status < 0)
+ return status;
+
+ if (status > 0) {
+ log_dhcp6_client(client, "%s Status %s",
+ dhcp6_message_type_to_string(message->type),
+ dhcp6_message_status_to_string(status));
+
+ return -EINVAL;
+ }
+
+ break;
+
+ case SD_DHCP6_OPTION_IA_NA:
+ if (client->state == DHCP6_STATE_INFORMATION_REQUEST) {
+ log_dhcp6_client(client, "Information request ignoring IA NA option");
+
+ break;
+ }
+
+ r = dhcp6_option_parse_ia(option, &lease->ia);
+ if (r < 0 && r != -ENOMSG)
+ return r;
+
+ r = dhcp6_lease_get_iaid(lease, &iaid_lease);
+ if (r < 0)
+ return r;
+
+ if (client->ia_na.ia_na.id != iaid_lease) {
+ log_dhcp6_client(client, "%s has wrong IAID for IA NA",
+ dhcp6_message_type_to_string(message->type));
+ return -EINVAL;
+ }
+
+ if (lease->ia.addresses) {
+ lt_t1 = MIN(lt_t1, be32toh(lease->ia.ia_na.lifetime_t1));
+ lt_t2 = MIN(lt_t2, be32toh(lease->ia.ia_na.lifetime_t1));
+ }
+
+ break;
+
+ case SD_DHCP6_OPTION_IA_PD:
+ if (client->state == DHCP6_STATE_INFORMATION_REQUEST) {
+ log_dhcp6_client(client, "Information request ignoring IA PD option");
+
+ break;
+ }
+
+ r = dhcp6_option_parse_ia(option, &lease->pd);
+ if (r < 0 && r != -ENOMSG)
+ return r;
+
+ r = dhcp6_lease_get_pd_iaid(lease, &iaid_lease);
+ if (r < 0)
+ return r;
+
+ if (client->ia_pd.ia_pd.id != iaid_lease) {
+ log_dhcp6_client(client, "%s has wrong IAID for IA PD",
+ dhcp6_message_type_to_string(message->type));
+ return -EINVAL;
+ }
+
+ if (lease->pd.addresses) {
+ lt_t1 = MIN(lt_t1, be32toh(lease->pd.ia_pd.lifetime_t1));
+ lt_t2 = MIN(lt_t2, be32toh(lease->pd.ia_pd.lifetime_t2));
+ }
+
+ break;
+
+ case SD_DHCP6_OPTION_RAPID_COMMIT:
+ r = dhcp6_lease_set_rapid_commit(lease);
+ if (r < 0)
+ return r;
+
+ break;
+
+ case SD_DHCP6_OPTION_DNS_SERVERS:
+ r = dhcp6_lease_set_dns(lease, optval, optlen);
+ if (r < 0)
+ return r;
+
+ break;
+
+ case SD_DHCP6_OPTION_DOMAIN_LIST:
+ r = dhcp6_lease_set_domains(lease, optval, optlen);
+ if (r < 0)
+ return r;
+
+ break;
+
+ case SD_DHCP6_OPTION_NTP_SERVER:
+ r = dhcp6_lease_set_ntp(lease, optval, optlen);
+ if (r < 0)
+ return r;
+
+ break;
+
+ case SD_DHCP6_OPTION_SNTP_SERVERS:
+ r = dhcp6_lease_set_sntp(lease, optval, optlen);
+ if (r < 0)
+ return r;
+
+ break;
+ }
+
+ pos += offsetof(DHCP6Option, data) + optlen;
+ }
+
+ if (!clientid) {
+ log_dhcp6_client(client, "%s has incomplete options",
+ dhcp6_message_type_to_string(message->type));
+ return -EINVAL;
+ }
+
+ if (client->state != DHCP6_STATE_INFORMATION_REQUEST) {
+ r = dhcp6_lease_get_serverid(lease, NULL, NULL);
+ if (r < 0) {
+ log_dhcp6_client(client, "%s has no server id",
+ dhcp6_message_type_to_string(message->type));
+ return -EINVAL;
+ }
+
+ } else {
+ if (lease->ia.addresses) {
+ lease->ia.ia_na.lifetime_t1 = htobe32(lt_t1);
+ lease->ia.ia_na.lifetime_t2 = htobe32(lt_t2);
+ }
+
+ if (lease->pd.addresses) {
+ lease->pd.ia_pd.lifetime_t1 = htobe32(lt_t1);
+ lease->pd.ia_pd.lifetime_t2 = htobe32(lt_t2);
+ }
+ }
+
+ return 0;
+}
+
+static int client_receive_reply(sd_dhcp6_client *client, DHCP6Message *reply, size_t len) {
+ _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL;
+ bool rapid_commit;
+ int r;
+
+ assert(client);
+ assert(reply);
+
+ if (reply->type != DHCP6_REPLY)
+ return 0;
+
+ r = dhcp6_lease_new(&lease);
+ if (r < 0)
+ return -ENOMEM;
+
+ r = client_parse_message(client, reply, len, lease);
+ if (r < 0)
+ return r;
+
+ if (client->state == DHCP6_STATE_SOLICITATION) {
+ r = dhcp6_lease_get_rapid_commit(lease, &rapid_commit);
+ if (r < 0)
+ return r;
+
+ if (!rapid_commit)
+ return 0;
+ }
+
+ sd_dhcp6_lease_unref(client->lease);
+ client->lease = TAKE_PTR(lease);
+
+ return DHCP6_STATE_BOUND;
+}
+
+static int client_receive_advertise(sd_dhcp6_client *client, DHCP6Message *advertise, size_t len) {
+ _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL;
+ uint8_t pref_advertise = 0, pref_lease = 0;
+ int r;
+
+ if (advertise->type != DHCP6_ADVERTISE)
+ return 0;
+
+ r = dhcp6_lease_new(&lease);
+ if (r < 0)
+ return r;
+
+ r = client_parse_message(client, advertise, len, lease);
+ if (r < 0)
+ return r;
+
+ r = dhcp6_lease_get_preference(lease, &pref_advertise);
+ if (r < 0)
+ return r;
+
+ r = dhcp6_lease_get_preference(client->lease, &pref_lease);
+
+ if (r < 0 || pref_advertise > pref_lease) {
+ sd_dhcp6_lease_unref(client->lease);
+ client->lease = TAKE_PTR(lease);
+ r = 0;
+ }
+
+ if (pref_advertise == 255 || client->retransmit_count > 1)
+ r = DHCP6_STATE_REQUEST;
+
+ return r;
+}
+
+static int client_receive_message(
+ sd_event_source *s,
+ int fd, uint32_t
+ revents,
+ void *userdata) {
+
+ sd_dhcp6_client *client = userdata;
+ DHCP6_CLIENT_DONT_DESTROY(client);
+ _cleanup_free_ DHCP6Message *message = NULL;
+ ssize_t buflen, len;
+ int r = 0;
+
+ assert(s);
+ assert(client);
+ assert(client->event);
+
+ buflen = next_datagram_size_fd(fd);
+ if (buflen < 0)
+ return buflen;
+
+ message = malloc(buflen);
+ if (!message)
+ return -ENOMEM;
+
+ len = recv(fd, message, buflen, 0);
+ if (len < 0) {
+ if (IN_SET(errno, EAGAIN, EINTR))
+ return 0;
+
+ return log_dhcp6_client_errno(client, errno, "Could not receive message from UDP socket: %m");
+
+ }
+ if ((size_t) len < sizeof(DHCP6Message)) {
+ log_dhcp6_client(client, "Too small to be DHCP6 message: ignoring");
+ return 0;
+ }
+
+ switch(message->type) {
+ case DHCP6_SOLICIT:
+ case DHCP6_REQUEST:
+ case DHCP6_CONFIRM:
+ case DHCP6_RENEW:
+ case DHCP6_REBIND:
+ case DHCP6_RELEASE:
+ case DHCP6_DECLINE:
+ case DHCP6_INFORMATION_REQUEST:
+ case DHCP6_RELAY_FORW:
+ case DHCP6_RELAY_REPL:
+ return 0;
+
+ case DHCP6_ADVERTISE:
+ case DHCP6_REPLY:
+ case DHCP6_RECONFIGURE:
+ break;
+
+ default:
+ log_dhcp6_client(client, "Unknown message type %d", message->type);
+ return 0;
+ }
+
+ if (client->transaction_id != (message->transaction_id &
+ htobe32(0x00ffffff)))
+ return 0;
+
+ switch (client->state) {
+ case DHCP6_STATE_INFORMATION_REQUEST:
+ r = client_receive_reply(client, message, len);
+ if (r < 0)
+ return 0;
+
+ client_notify(client, SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST);
+
+ client_start(client, DHCP6_STATE_STOPPED);
+
+ break;
+
+ case DHCP6_STATE_SOLICITATION:
+ r = client_receive_advertise(client, message, len);
+
+ if (r == DHCP6_STATE_REQUEST) {
+ client_start(client, r);
+
+ break;
+ }
+
+ _fallthrough_; /* for Soliciation Rapid Commit option check */
+ case DHCP6_STATE_REQUEST:
+ case DHCP6_STATE_RENEW:
+ case DHCP6_STATE_REBIND:
+
+ r = client_receive_reply(client, message, len);
+ if (r < 0)
+ return 0;
+
+ if (r == DHCP6_STATE_BOUND) {
+
+ r = client_start(client, DHCP6_STATE_BOUND);
+ if (r < 0) {
+ client_stop(client, r);
+ return 0;
+ }
+
+ client_notify(client, SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE);
+ }
+
+ break;
+
+ case DHCP6_STATE_BOUND:
+
+ break;
+
+ case DHCP6_STATE_STOPPED:
+ return 0;
+ }
+
+ log_dhcp6_client(client, "Recv %s",
+ dhcp6_message_type_to_string(message->type));
+
+ return 0;
+}
+
+static int client_get_lifetime(sd_dhcp6_client *client, uint32_t *lifetime_t1,
+ uint32_t *lifetime_t2) {
+ assert_return(client, -EINVAL);
+ assert_return(client->lease, -EINVAL);
+
+ if (FLAGS_SET(client->request, DHCP6_REQUEST_IA_NA) && client->lease->ia.addresses) {
+ *lifetime_t1 = be32toh(client->lease->ia.ia_na.lifetime_t1);
+ *lifetime_t2 = be32toh(client->lease->ia.ia_na.lifetime_t2);
+
+ return 0;
+ }
+
+ if (FLAGS_SET(client->request, DHCP6_REQUEST_IA_PD) && client->lease->pd.addresses) {
+ *lifetime_t1 = be32toh(client->lease->pd.ia_pd.lifetime_t1);
+ *lifetime_t2 = be32toh(client->lease->pd.ia_pd.lifetime_t2);
+
+ return 0;
+ }
+
+ return -ENOMSG;
+}
+
+static int client_start(sd_dhcp6_client *client, enum DHCP6State state) {
+ int r;
+ usec_t timeout, time_now;
+ char time_string[FORMAT_TIMESPAN_MAX];
+ uint32_t lifetime_t1, lifetime_t2;
+
+ assert_return(client, -EINVAL);
+ assert_return(client->event, -EINVAL);
+ assert_return(client->ifindex > 0, -EINVAL);
+ assert_return(client->state != state, -EINVAL);
+
+ (void) event_source_disable(client->timeout_resend_expire);
+ (void) event_source_disable(client->timeout_resend);
+ client->retransmit_time = 0;
+ client->retransmit_count = 0;
+
+ r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now);
+ if (r < 0)
+ return r;
+
+ if (!client->receive_message) {
+ r = sd_event_add_io(client->event, &client->receive_message,
+ client->fd, EPOLLIN, client_receive_message,
+ client);
+ if (r < 0)
+ goto error;
+
+ r = sd_event_source_set_priority(client->receive_message,
+ client->event_priority);
+ if (r < 0)
+ goto error;
+
+ r = sd_event_source_set_description(client->receive_message,
+ "dhcp6-receive-message");
+ if (r < 0)
+ goto error;
+ }
+
+ switch (state) {
+ case DHCP6_STATE_STOPPED:
+ if (client->state == DHCP6_STATE_INFORMATION_REQUEST) {
+ client->state = DHCP6_STATE_STOPPED;
+
+ return 0;
+ }
+
+ _fallthrough_;
+ case DHCP6_STATE_SOLICITATION:
+ client->state = DHCP6_STATE_SOLICITATION;
+
+ break;
+
+ case DHCP6_STATE_INFORMATION_REQUEST:
+ case DHCP6_STATE_REQUEST:
+ case DHCP6_STATE_RENEW:
+ case DHCP6_STATE_REBIND:
+
+ client->state = state;
+
+ break;
+
+ case DHCP6_STATE_BOUND:
+
+ r = client_get_lifetime(client, &lifetime_t1, &lifetime_t2);
+ if (r < 0)
+ goto error;
+
+ if (lifetime_t1 == 0xffffffff || lifetime_t2 == 0xffffffff) {
+ log_dhcp6_client(client, "Infinite T1 0x%08x or T2 0x%08x",
+ lifetime_t1, lifetime_t2);
+
+ return 0;
+ }
+
+ timeout = client_timeout_compute_random(lifetime_t1 * USEC_PER_SEC);
+
+ log_dhcp6_client(client, "T1 expires in %s",
+ format_timespan(time_string, FORMAT_TIMESPAN_MAX, timeout, USEC_PER_SEC));
+
+ r = event_reset_time(client->event, &client->timeout_t1,
+ clock_boottime_or_monotonic(),
+ time_now + timeout, 10 * USEC_PER_SEC,
+ client_timeout_t1, client,
+ client->event_priority, "dhcp6-t1-timeout", true);
+ if (r < 0)
+ goto error;
+
+ timeout = client_timeout_compute_random(lifetime_t2 * USEC_PER_SEC);
+
+ log_dhcp6_client(client, "T2 expires in %s",
+ format_timespan(time_string, FORMAT_TIMESPAN_MAX, timeout, USEC_PER_SEC));
+
+ r = event_reset_time(client->event, &client->timeout_t2,
+ clock_boottime_or_monotonic(),
+ time_now + timeout, 10 * USEC_PER_SEC,
+ client_timeout_t2, client,
+ client->event_priority, "dhcp6-t2-timeout", true);
+ if (r < 0)
+ goto error;
+
+ client->state = state;
+
+ return 0;
+ }
+
+ client->transaction_id = random_u32() & htobe32(0x00ffffff);
+ client->transaction_start = time_now;
+
+ r = event_reset_time(client->event, &client->timeout_resend,
+ clock_boottime_or_monotonic(),
+ 0, 0,
+ client_timeout_resend, client,
+ client->event_priority, "dhcp6-resend-timeout", true);
+ if (r < 0)
+ goto error;
+
+ return 0;
+
+ error:
+ client_reset(client);
+ return r;
+}
+
+int sd_dhcp6_client_stop(sd_dhcp6_client *client) {
+ assert_return(client, -EINVAL);
+
+ client_stop(client, SD_DHCP6_CLIENT_EVENT_STOP);
+
+ client->fd = safe_close(client->fd);
+
+ return 0;
+}
+
+int sd_dhcp6_client_is_running(sd_dhcp6_client *client) {
+ assert_return(client, -EINVAL);
+
+ return client->state != DHCP6_STATE_STOPPED;
+}
+
+int sd_dhcp6_client_start(sd_dhcp6_client *client) {
+ enum DHCP6State state = DHCP6_STATE_SOLICITATION;
+ int r = 0;
+
+ assert_return(client, -EINVAL);
+ assert_return(client->event, -EINVAL);
+ assert_return(client->ifindex > 0, -EINVAL);
+ assert_return(in_addr_is_link_local(AF_INET6, (const union in_addr_union *) &client->local_address) > 0, -EINVAL);
+
+ if (!IN_SET(client->state, DHCP6_STATE_STOPPED))
+ return -EBUSY;
+
+ if (!client->information_request && !client->request)
+ return -EINVAL;
+
+ r = client_reset(client);
+ if (r < 0)
+ return r;
+
+ r = client_ensure_iaid(client);
+ if (r < 0)
+ return r;
+
+ r = client_ensure_duid(client);
+ if (r < 0)
+ return r;
+
+ if (client->fd < 0) {
+ r = dhcp6_network_bind_udp_socket(client->ifindex, &client->local_address);
+ if (r < 0) {
+ _cleanup_free_ char *p = NULL;
+
+ (void) in_addr_to_string(AF_INET6, (const union in_addr_union*) &client->local_address, &p);
+ return log_dhcp6_client_errno(client, r,
+ "Failed to bind to UDP socket at address %s: %m", strna(p));
+ }
+
+ client->fd = r;
+ }
+
+ if (client->information_request)
+ state = DHCP6_STATE_INFORMATION_REQUEST;
+
+ log_dhcp6_client(client, "Started in %s mode",
+ client->information_request? "Information request":
+ "Managed");
+
+ return client_start(client, state);
+}
+
+int sd_dhcp6_client_attach_event(sd_dhcp6_client *client, sd_event *event, int64_t priority) {
+ int r;
+
+ assert_return(client, -EINVAL);
+ assert_return(!client->event, -EBUSY);
+
+ if (event)
+ client->event = sd_event_ref(event);
+ else {
+ r = sd_event_default(&client->event);
+ if (r < 0)
+ return 0;
+ }
+
+ client->event_priority = priority;
+
+ return 0;
+}
+
+int sd_dhcp6_client_detach_event(sd_dhcp6_client *client) {
+ assert_return(client, -EINVAL);
+
+ client->event = sd_event_unref(client->event);
+
+ return 0;
+}
+
+sd_event *sd_dhcp6_client_get_event(sd_dhcp6_client *client) {
+ assert_return(client, NULL);
+
+ return client->event;
+}
+
+static sd_dhcp6_client *dhcp6_client_free(sd_dhcp6_client *client) {
+ assert(client);
+
+ client->timeout_resend = sd_event_source_unref(client->timeout_resend);
+ client->timeout_resend_expire = sd_event_source_unref(client->timeout_resend_expire);
+ client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
+ client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
+
+ client_reset(client);
+
+ client->fd = safe_close(client->fd);
+
+ sd_dhcp6_client_detach_event(client);
+
+ free(client->req_opts);
+ free(client->fqdn);
+ return mfree(client);
+}
+
+DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp6_client, sd_dhcp6_client, dhcp6_client_free);
+
+int sd_dhcp6_client_new(sd_dhcp6_client **ret) {
+ _cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL;
+ _cleanup_free_ be16_t *req_opts = NULL;
+ size_t t;
+
+ assert_return(ret, -EINVAL);
+
+ req_opts = new(be16_t, ELEMENTSOF(default_req_opts));
+ if (!req_opts)
+ return -ENOMEM;
+
+ for (t = 0; t < ELEMENTSOF(default_req_opts); t++)
+ req_opts[t] = htobe16(default_req_opts[t]);
+
+ client = new(sd_dhcp6_client, 1);
+ if (!client)
+ return -ENOMEM;
+
+ *client = (sd_dhcp6_client) {
+ .n_ref = 1,
+ .ia_na.type = SD_DHCP6_OPTION_IA_NA,
+ .ia_pd.type = SD_DHCP6_OPTION_IA_PD,
+ .ifindex = -1,
+ .request = DHCP6_REQUEST_IA_NA,
+ .fd = -1,
+ .req_opts_len = ELEMENTSOF(default_req_opts),
+ .req_opts = TAKE_PTR(req_opts),
+ };
+
+ *ret = TAKE_PTR(client);
+
+ return 0;
+}