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e851b0fe9d16600bca7f77c99e56ca4377760425
systemd/src/libsystemd-network/sd-dhcp6-client.c
T
Chris Mason 3f0aa5852e libsystemd-network: propagate sd_event_default() failure 
Four *_attach_event helpers swallow sd_event_default() failures and
return success while leaving obj->event NULL:

    sd_dhcp_client_attach_event   (sd-dhcp-client.c)
    sd_dhcp6_client_attach_event  (sd-dhcp6-client.c)
    sd_ndisc_attach_event         (sd-ndisc.c)
    sd_radv_attach_event          (sd-radv.c)

Each contains the same copy-pasted typo in the NULL-event branch:

    r = sd_event_default(&obj->event);
    if (r < 0)
            return 0;          /* swallows -ENOMEM / -ECHILD */

The caller is told the attach succeeded, but obj->event is still
NULL. A subsequent *_start() then trips assert_return(obj->event,
-EINVAL) and returns a spurious -EINVAL (or aborts on assert-abort
builds), and any consumer of *_get_event() dereferences NULL.

The sibling helper sd_dhcp_server_attach_event already uses the
correct pattern:

    r = sd_event_default(&server->event);
    if (r < 0)
            return r;

Fix by returning r instead of 0 at each of the four sites so the
sd_event_default() errno is propagated to the caller and ownership
stays with the caller.

Assisted-by: kres (claude-opus-4-7)
Signed-off-by: Chris Mason <clm@meta.com>
2026-05-22 22:20:03 +02:00

1594 lines
52 KiB
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/***
Copyright © 2014-2015 Intel Corporation. All rights reserved.
***/
#include <linux/if_arp.h>
#include <linux/if_infiniband.h>
#include "sd-dhcp6-client.h"
#include "sd-dhcp6-option.h"
#include "alloc-util.h"
#include "device-util.h"
#include "dhcp-duid-internal.h"
#include "dhcp6-client-internal.h"
#include "dhcp6-internal.h"
#include "dhcp6-lease-internal.h"
#include "dns-domain.h"
#include "errno-util.h"
#include "event-util.h"
#include "fd-util.h"
#include "hostname-util.h"
#include "in-addr-util.h"
#include "iovec-util.h"
#include "ordered-set.h"
#include "random-util.h"
#include "socket-util.h"
#include "sort-util.h"
#include "string-util.h"
#include "strv.h"
#include "web-util.h"
#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_transaction(sd_dhcp6_client *client, 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 dhcp6_client_set_state_callback(
sd_dhcp6_client *client,
sd_dhcp6_client_callback_t cb,
void *userdata) {
assert_return(client, -EINVAL);
client->state_callback = cb;
client->state_userdata = userdata;
return 0;
}
int sd_dhcp6_client_set_ifindex(sd_dhcp6_client *client, int ifindex) {
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
assert_return(ifindex > 0, -EINVAL);
client->ifindex = ifindex;
return 0;
}
int sd_dhcp6_client_set_ifname(sd_dhcp6_client *client, const char *ifname) {
assert_return(client, -EINVAL);
assert_return(ifname, -EINVAL);
if (!ifname_valid_full(ifname, IFNAME_VALID_ALTERNATIVE))
return -EINVAL;
return free_and_strdup(&client->ifname, ifname);
}
int sd_dhcp6_client_get_ifname(sd_dhcp6_client *client, const char **ret) {
int r;
assert_return(client, -EINVAL);
r = get_ifname(client->ifindex, &client->ifname);
if (r < 0)
return r;
if (ret)
*ret = client->ifname;
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(!sd_dhcp6_client_is_running(client), -EBUSY);
assert_return(local_address, -EINVAL);
assert_return(in6_addr_is_link_local(local_address) > 0, -EINVAL);
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 <= sizeof(client->hw_addr.bytes), -EINVAL);
/* Unlike the other setters, it is OK to set a new MAC address while the client is running,
* as the MAC address is used only when setting DUID or IAID. */
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 {
client->arp_type = ARPHRD_NONE;
client->hw_addr.length = 0;
return 0;
}
client->arp_type = arp_type;
hw_addr_set(&client->hw_addr, addr, addr_len);
return 0;
}
int sd_dhcp6_client_set_prefix_delegation_hint(
sd_dhcp6_client *client,
uint8_t prefixlen,
const struct in6_addr *pd_prefix) {
_cleanup_free_ DHCP6Address *prefix = NULL;
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
if (!pd_prefix) {
/* clear previous assignments. */
dhcp6_ia_clear_addresses(&client->ia_pd);
return 0;
}
assert_return(prefixlen > 0 && prefixlen <= 128, -EINVAL);
prefix = new(DHCP6Address, 1);
if (!prefix)
return -ENOMEM;
*prefix = (DHCP6Address) {
.iapdprefix.address = *pd_prefix,
.iapdprefix.prefixlen = prefixlen,
};
LIST_PREPEND(addresses, client->ia_pd.addresses, TAKE_PTR(prefix));
return 1;
}
int sd_dhcp6_client_add_vendor_option(sd_dhcp6_client *client, sd_dhcp6_option *v) {
int r;
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
if (!v) {
/* Clear the previous assignments. */
ordered_set_clear(client->vendor_options);
return 0;
}
r = ordered_set_ensure_put(&client->vendor_options, &dhcp6_option_hash_ops, v);
if (r <= 0)
return r;
sd_dhcp6_option_ref(v);
return r;
}
static int client_ensure_duid(sd_dhcp6_client *client) {
assert(client);
if (sd_dhcp_duid_is_set(&client->duid))
return 0;
return sd_dhcp6_client_set_duid_en(client);
}
/**
* 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.
*/
int sd_dhcp6_client_set_duid_llt(sd_dhcp6_client *client, uint64_t llt_time) {
int r;
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
r = sd_dhcp_duid_set_llt(&client->duid, client->hw_addr.bytes, client->hw_addr.length, client->arp_type, llt_time);
if (r < 0)
return log_dhcp6_client_errno(client, r, "Failed to set DUID-LLT: %m");
return 0;
}
int sd_dhcp6_client_set_duid_ll(sd_dhcp6_client *client) {
int r;
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
r = sd_dhcp_duid_set_ll(&client->duid, client->hw_addr.bytes, client->hw_addr.length, client->arp_type);
if (r < 0)
return log_dhcp6_client_errno(client, r, "Failed to set DUID-LL: %m");
return 0;
}
int sd_dhcp6_client_set_duid_en(sd_dhcp6_client *client) {
int r;
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
r = sd_dhcp_duid_set_en(&client->duid);
if (r < 0)
return log_dhcp6_client_errno(client, r, "Failed to set DUID-EN: %m");
return 0;
}
int sd_dhcp6_client_set_duid_uuid(sd_dhcp6_client *client) {
int r;
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
r = sd_dhcp_duid_set_uuid(&client->duid);
if (r < 0)
return log_dhcp6_client_errno(client, r, "Failed to set DUID-UUID: %m");
return 0;
}
int sd_dhcp6_client_set_duid_raw(sd_dhcp6_client *client, uint16_t duid_type, const uint8_t *duid, size_t duid_len) {
int r;
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
assert_return(duid || duid_len == 0, -EINVAL);
r = sd_dhcp_duid_set(&client->duid, duid_type, duid, duid_len);
if (r < 0)
return log_dhcp6_client_errno(client, r, "Failed to set DUID: %m");
return 0;
}
int sd_dhcp6_client_set_duid(sd_dhcp6_client *client, const sd_dhcp_duid *duid) {
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
assert_return(sd_dhcp_duid_is_set(duid), -EINVAL);
client->duid = *duid;
return 0;
}
int sd_dhcp6_client_get_duid(sd_dhcp6_client *client, const sd_dhcp_duid **ret) {
assert_return(client, -EINVAL);
assert_return(ret, -EINVAL);
if (!sd_dhcp_duid_is_set(&client->duid))
return -ENODATA;
*ret = &client->duid;
return 0;
}
int sd_dhcp6_client_get_duid_as_string(sd_dhcp6_client *client, char **ret) {
assert_return(client, -EINVAL);
assert_return(ret, -EINVAL);
if (!sd_dhcp_duid_is_set(&client->duid))
return -ENODATA;
return sd_dhcp_duid_to_string(&client->duid, ret);
}
int sd_dhcp6_client_set_iaid(sd_dhcp6_client *client, uint32_t iaid) {
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
client->ia_na.header.id = htobe32(iaid);
client->ia_pd.header.id = htobe32(iaid);
client->iaid_set = true;
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->dev, &client->hw_addr,
/* legacy_unstable_byteorder= */ true,
&iaid);
if (r < 0)
return r;
client->ia_na.header.id = iaid;
client->ia_pd.header.id = iaid;
client->iaid_set = true;
return 0;
}
int sd_dhcp6_client_get_iaid(sd_dhcp6_client *client, uint32_t *iaid) {
assert_return(client, -EINVAL);
assert_return(iaid, -EINVAL);
if (!client->iaid_set)
return -ENODATA;
*iaid = be32toh(client->ia_na.header.id);
return 0;
}
int sd_dhcp6_client_set_fqdn(
sd_dhcp6_client *client,
const char *fqdn) {
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
/* Make sure FQDN qualifies as DNS and as Linux hostname */
if (fqdn &&
!(hostname_is_valid(fqdn, 0) && 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(!sd_dhcp6_client_is_running(client), -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;
}
static int be16_compare_func(const be16_t *a, const be16_t *b) {
assert(a);
assert(b);
return CMP(be16toh(*a), be16toh(*b));
}
int sd_dhcp6_client_set_request_option(sd_dhcp6_client *client, uint16_t option) {
be16_t opt;
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
if (!dhcp6_option_can_request(option))
return -EINVAL;
opt = htobe16(option);
if (typesafe_bsearch(&opt, client->req_opts, client->n_req_opts, be16_compare_func))
return -EEXIST;
if (!GREEDY_REALLOC(client->req_opts, client->n_req_opts + 1))
return -ENOMEM;
client->req_opts[client->n_req_opts++] = opt;
/* Sort immediately to make the above binary search will work for the next time. */
typesafe_qsort(client->req_opts, client->n_req_opts, be16_compare_func);
return 0;
}
int sd_dhcp6_client_set_request_mud_url(sd_dhcp6_client *client, const char *mudurl) {
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
assert_return(mudurl, -EINVAL);
assert_return(strlen(mudurl) <= UINT8_MAX, -EINVAL);
assert_return(http_url_is_valid(mudurl), -EINVAL);
return free_and_strdup(&client->mudurl, mudurl);
}
int sd_dhcp6_client_set_request_user_class(sd_dhcp6_client *client, char * const *user_class) {
char **s;
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
assert_return(!strv_isempty(user_class), -EINVAL);
STRV_FOREACH(p, user_class) {
size_t len = strlen(*p);
if (len > UINT16_MAX || len == 0)
return -EINVAL;
}
s = strv_copy(user_class);
if (!s)
return -ENOMEM;
return strv_free_and_replace(client->user_class, s);
}
int sd_dhcp6_client_set_request_vendor_class(sd_dhcp6_client *client, char * const *vendor_class) {
char **s;
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
assert_return(!strv_isempty(vendor_class), -EINVAL);
STRV_FOREACH(p, vendor_class) {
size_t len = strlen(*p);
if (len > UINT16_MAX || len == 0)
return -EINVAL;
}
s = strv_copy(vendor_class);
if (!s)
return -ENOMEM;
return strv_free_and_replace(client->vendor_class, s);
}
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_ia, DHCP6_REQUEST_IA_PD);
return 0;
}
int sd_dhcp6_client_set_prefix_delegation(sd_dhcp6_client *client, int delegation) {
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
SET_FLAG(client->request_ia, 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_ia, DHCP6_REQUEST_IA_NA);
return 0;
}
int sd_dhcp6_client_set_address_request(sd_dhcp6_client *client, int request) {
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
SET_FLAG(client->request_ia, DHCP6_REQUEST_IA_NA, request);
return 0;
}
int dhcp6_client_set_transaction_id(sd_dhcp6_client *client, uint32_t transaction_id) {
assert(client);
assert_se(network_test_mode_enabled());
/* This is for tests or fuzzers. */
client->transaction_id = transaction_id & htobe32(0x00ffffff);
return 0;
}
int sd_dhcp6_client_set_rapid_commit(sd_dhcp6_client *client, int enable) {
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
client->rapid_commit = enable;
return 0;
}
int sd_dhcp6_client_set_send_release(sd_dhcp6_client *client, int enable) {
assert_return(client, -EINVAL);
client->send_release = enable;
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;
}
int sd_dhcp6_client_add_option(sd_dhcp6_client *client, sd_dhcp6_option *v) {
int r;
assert_return(client, -EINVAL);
assert_return(v, -EINVAL);
r = ordered_hashmap_ensure_put(&client->extra_options, &dhcp6_option_hash_ops, UINT_TO_PTR(v->option), v);
if (r <= 0)
return r;
sd_dhcp6_option_ref(v);
return r;
}
static void client_set_state(sd_dhcp6_client *client, DHCP6State state) {
assert(client);
if (client->state == state)
return;
log_dhcp6_client(client, "State changed: %s -> %s",
dhcp6_state_to_string(client->state), dhcp6_state_to_string(state));
client->state = state;
if (client->state_callback)
client->state_callback(client, state, client->state_userdata);
}
int dhcp6_client_get_state(sd_dhcp6_client *client) {
assert_return(client, -EINVAL);
return client->state;
}
static void client_notify(sd_dhcp6_client *client, int event) {
assert(client);
if (client->callback)
client->callback(client, event, client->userdata);
}
static void client_cleanup(sd_dhcp6_client *client) {
assert(client);
client->lease = sd_dhcp6_lease_unref(client->lease);
/* Reset IRT here. Otherwise, we cannot restart the client in the information requesting mode,
* even though the lease is freed below. */
client->information_request_time_usec = 0;
client->information_refresh_time_usec = 0;
(void) event_source_disable(client->receive_message);
(void) event_source_disable(client->timeout_resend);
(void) event_source_disable(client->timeout_expire);
(void) event_source_disable(client->timeout_t1);
(void) event_source_disable(client->timeout_t2);
client_set_state(client, DHCP6_STATE_STOPPED);
}
static void client_stop(sd_dhcp6_client *client, int error) {
DHCP6_CLIENT_DONT_DESTROY(client);
assert(client);
client_notify(client, error);
client_cleanup(client);
}
static int client_append_common_options_in_managed_mode(
sd_dhcp6_client *client,
uint8_t **buf,
size_t *offset,
const DHCP6IA *ia_na,
const DHCP6IA *ia_pd) {
int r;
assert(client);
assert(IN_SET(client->state,
DHCP6_STATE_SOLICITATION,
DHCP6_STATE_REQUEST,
DHCP6_STATE_RENEW,
DHCP6_STATE_REBIND,
DHCP6_STATE_STOPPING));
assert(buf);
assert(*buf);
assert(offset);
if (FLAGS_SET(client->request_ia, DHCP6_REQUEST_IA_NA) && ia_na) {
r = dhcp6_option_append_ia(buf, offset, ia_na);
if (r < 0)
return r;
}
if (FLAGS_SET(client->request_ia, DHCP6_REQUEST_IA_PD) && ia_pd) {
r = dhcp6_option_append_ia(buf, offset, ia_pd);
if (r < 0)
return r;
}
if (client->state != DHCP6_STATE_STOPPING) {
r = dhcp6_option_append_fqdn(buf, offset, client->fqdn);
if (r < 0)
return r;
}
r = dhcp6_option_append_user_class(buf, offset, client->user_class);
if (r < 0)
return r;
r = dhcp6_option_append_vendor_class(buf, offset, client->vendor_class);
if (r < 0)
return r;
r = dhcp6_option_append_vendor_option(buf, offset, client->vendor_options);
if (r < 0)
return r;
return 0;
}
static DHCP6MessageType client_message_type_from_state(sd_dhcp6_client *client) {
assert(client);
switch (client->state) {
case DHCP6_STATE_INFORMATION_REQUEST:
return DHCP6_MESSAGE_INFORMATION_REQUEST;
case DHCP6_STATE_SOLICITATION:
return DHCP6_MESSAGE_SOLICIT;
case DHCP6_STATE_REQUEST:
return DHCP6_MESSAGE_REQUEST;
case DHCP6_STATE_RENEW:
return DHCP6_MESSAGE_RENEW;
case DHCP6_STATE_REBIND:
return DHCP6_MESSAGE_REBIND;
case DHCP6_STATE_STOPPING:
return DHCP6_MESSAGE_RELEASE;
default:
assert_not_reached();
}
}
static int client_append_oro(sd_dhcp6_client *client, uint8_t **buf, size_t *offset) {
_cleanup_free_ be16_t *p = NULL;
be16_t *req_opts;
size_t n;
assert(client);
assert(buf);
assert(*buf);
assert(offset);
switch (client->state) {
case DHCP6_STATE_INFORMATION_REQUEST:
n = client->n_req_opts;
p = new(be16_t, n + 2);
if (!p)
return -ENOMEM;
memcpy_safe(p, client->req_opts, n * sizeof(be16_t));
p[n++] = htobe16(SD_DHCP6_OPTION_INFORMATION_REFRESH_TIME); /* RFC 8415 section 21.23 */
p[n++] = htobe16(SD_DHCP6_OPTION_INF_MAX_RT); /* RFC 8415 section 21.25 */
typesafe_qsort(p, n, be16_compare_func);
req_opts = p;
break;
case DHCP6_STATE_SOLICITATION:
n = client->n_req_opts;
p = new(be16_t, n + 1);
if (!p)
return -ENOMEM;
memcpy_safe(p, client->req_opts, n * sizeof(be16_t));
p[n++] = htobe16(SD_DHCP6_OPTION_SOL_MAX_RT); /* RFC 8415 section 21.24 */
typesafe_qsort(p, n, be16_compare_func);
req_opts = p;
break;
case DHCP6_STATE_STOPPING:
return 0;
default:
n = client->n_req_opts;
req_opts = client->req_opts;
}
if (n == 0)
return 0;
return dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_ORO, n * sizeof(be16_t), req_opts);
}
static int client_append_mudurl(sd_dhcp6_client *client, uint8_t **buf, size_t *offset) {
assert(client);
assert(buf);
assert(*buf);
assert(offset);
if (!client->mudurl)
return 0;
if (client->state == DHCP6_STATE_STOPPING)
return 0;
return dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_MUD_URL_V6,
strlen(client->mudurl), client->mudurl);
}
int dhcp6_client_send_message(sd_dhcp6_client *client) {
_cleanup_free_ uint8_t *buf = NULL;
struct sd_dhcp6_option *j;
usec_t elapsed_usec, time_now;
be16_t elapsed_time;
DHCP6Message *message;
size_t offset;
int r;
assert(client);
assert(client->event);
r = sd_event_now(client->event, CLOCK_BOOTTIME, &time_now);
if (r < 0)
return r;
if (!GREEDY_REALLOC0(buf, offsetof(DHCP6Message, options)))
return -ENOMEM;
message = (DHCP6Message*) buf;
message->transaction_id = client->transaction_id;
message->type = client_message_type_from_state(client);
offset = offsetof(DHCP6Message, options);
switch (client->state) {
case DHCP6_STATE_INFORMATION_REQUEST:
break;
case DHCP6_STATE_SOLICITATION:
if (client->rapid_commit) {
r = dhcp6_option_append(&buf, &offset, SD_DHCP6_OPTION_RAPID_COMMIT, 0, NULL);
if (r < 0)
return r;
}
r = client_append_common_options_in_managed_mode(client, &buf, &offset,
&client->ia_na, &client->ia_pd);
if (r < 0)
return r;
break;
case DHCP6_STATE_REQUEST:
case DHCP6_STATE_RENEW:
case DHCP6_STATE_STOPPING:
r = dhcp6_option_append(&buf, &offset, SD_DHCP6_OPTION_SERVERID,
client->lease->serverid_len,
client->lease->serverid);
if (r < 0)
return r;
_fallthrough_;
case DHCP6_STATE_REBIND:
assert(client->lease);
r = client_append_common_options_in_managed_mode(client, &buf, &offset,
client->lease->ia_na, client->lease->ia_pd);
if (r < 0)
return r;
break;
case DHCP6_STATE_BOUND:
case DHCP6_STATE_STOPPED:
default:
assert_not_reached();
}
r = client_append_mudurl(client, &buf, &offset);
if (r < 0)
return r;
r = client_append_oro(client, &buf, &offset);
if (r < 0)
return r;
assert(sd_dhcp_duid_is_set(&client->duid));
r = dhcp6_option_append(&buf, &offset, SD_DHCP6_OPTION_CLIENTID,
client->duid.size, &client->duid.duid);
if (r < 0)
return r;
ORDERED_HASHMAP_FOREACH(j, client->extra_options) {
r = dhcp6_option_append(&buf, &offset, j->option, j->length, j->data);
if (r < 0)
return r;
}
/* RFC 8415 Section 21.9.
* A client MUST include an Elapsed Time option in messages to indicate how long the client has
* been trying to complete a DHCP message exchange. */
elapsed_usec = MIN(usec_sub_unsigned(time_now, client->transaction_start) / USEC_PER_MSEC / 10, (usec_t) UINT16_MAX);
elapsed_time = htobe16(elapsed_usec);
r = dhcp6_option_append(&buf, &offset, SD_DHCP6_OPTION_ELAPSED_TIME, sizeof(elapsed_time), &elapsed_time);
if (r < 0)
return r;
r = dhcp6_network_send_udp_socket(client->fd, &IN6_ADDR_ALL_DHCP6_RELAY_AGENTS_AND_SERVERS, buf, offset);
if (r < 0)
return r;
log_dhcp6_client(client, "Sent %s",
dhcp6_message_type_to_string(client_message_type_from_state(client)));
return 0;
}
static usec_t client_timeout_compute_random(usec_t val) {
return usec_sub_unsigned(val, random_u64_range(val / 10));
}
static int client_timeout_resend(sd_event_source *s, uint64_t usec, void *userdata) {
sd_dhcp6_client *client = ASSERT_PTR(userdata);
usec_t init_retransmit_time, max_retransmit_time;
int r;
assert(client->event);
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 > 0 && client->lease) {
(void) client_start_transaction(client, DHCP6_STATE_REQUEST);
return 0;
}
init_retransmit_time = DHCP6_SOL_TIMEOUT;
max_retransmit_time = DHCP6_SOL_MAX_RT;
break;
case DHCP6_STATE_REQUEST:
if (client->retransmit_count >= DHCP6_REQ_MAX_RC) {
client_stop(client, SD_DHCP6_CLIENT_EVENT_RETRANS_MAX);
return 0;
}
init_retransmit_time = DHCP6_REQ_TIMEOUT;
max_retransmit_time = DHCP6_REQ_MAX_RT;
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;
/* Also, instead of setting MRD, the expire timer is already set in client_enter_bound_state(). */
break;
case DHCP6_STATE_STOPPED:
case DHCP6_STATE_STOPPING:
case DHCP6_STATE_BOUND:
default:
assert_not_reached();
}
r = dhcp6_client_send_message(client);
if (r >= 0)
client->retransmit_count++;
if (client->retransmit_time == 0) {
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 (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(client->retransmit_time, USEC_PER_SEC));
r = event_reset_time_relative(client->event, &client->timeout_resend,
CLOCK_BOOTTIME,
client->retransmit_time, 10 * USEC_PER_MSEC,
client_timeout_resend, client,
client->event_priority, "dhcp6-resend-timer", true);
if (r < 0)
client_stop(client, r);
return 0;
}
static int client_start_transaction(sd_dhcp6_client *client, DHCP6State state) {
int r;
assert(client);
assert(client->event);
switch (state) {
case DHCP6_STATE_INFORMATION_REQUEST:
case DHCP6_STATE_SOLICITATION:
assert(client->state == DHCP6_STATE_STOPPED);
break;
case DHCP6_STATE_REQUEST:
assert(client->state == DHCP6_STATE_SOLICITATION);
break;
case DHCP6_STATE_RENEW:
assert(client->state == DHCP6_STATE_BOUND);
break;
case DHCP6_STATE_REBIND:
assert(IN_SET(client->state, DHCP6_STATE_BOUND, DHCP6_STATE_RENEW));
break;
case DHCP6_STATE_STOPPED:
case DHCP6_STATE_STOPPING:
case DHCP6_STATE_BOUND:
default:
assert_not_reached();
}
client_set_state(client, state);
client->retransmit_time = 0;
client->retransmit_count = 0;
client->transaction_id = random_u32() & htobe32(0x00ffffff);
r = sd_event_now(client->event, CLOCK_BOOTTIME, &client->transaction_start);
if (r < 0)
goto error;
r = event_reset_time(client->event, &client->timeout_resend,
CLOCK_BOOTTIME,
0, 0,
client_timeout_resend, client,
client->event_priority, "dhcp6-resend-timeout", true);
if (r < 0)
goto error;
r = sd_event_source_set_enabled(client->receive_message, SD_EVENT_ON);
if (r < 0)
goto error;
return 0;
error:
client_stop(client, r);
return r;
}
static int client_timeout_expire(sd_event_source *s, uint64_t usec, void *userdata) {
sd_dhcp6_client *client = ASSERT_PTR(userdata);
DHCP6_CLIENT_DONT_DESTROY(client);
DHCP6State state;
(void) event_source_disable(client->timeout_expire);
(void) event_source_disable(client->timeout_t2);
(void) event_source_disable(client->timeout_t1);
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)
(void) client_start_transaction(client, DHCP6_STATE_SOLICITATION);
return 0;
}
static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) {
sd_dhcp6_client *client = ASSERT_PTR(userdata);
(void) event_source_disable(client->timeout_t2);
(void) event_source_disable(client->timeout_t1);
log_dhcp6_client(client, "Timeout T2");
(void) client_start_transaction(client, DHCP6_STATE_REBIND);
return 0;
}
static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) {
sd_dhcp6_client *client = ASSERT_PTR(userdata);
(void) event_source_disable(client->timeout_t1);
log_dhcp6_client(client, "Timeout T1");
(void) client_start_transaction(client, DHCP6_STATE_RENEW);
return 0;
}
static int client_enter_bound_state(sd_dhcp6_client *client) {
usec_t lifetime_t1, lifetime_t2, lifetime_valid;
int r;
assert(client);
assert(client->lease);
assert(IN_SET(client->state,
DHCP6_STATE_SOLICITATION,
DHCP6_STATE_REQUEST,
DHCP6_STATE_RENEW,
DHCP6_STATE_REBIND));
(void) event_source_disable(client->receive_message);
(void) event_source_disable(client->timeout_resend);
r = sd_dhcp6_lease_get_t1(client->lease, &lifetime_t1);
if (r < 0)
goto error;
r = sd_dhcp6_lease_get_t2(client->lease, &lifetime_t2);
if (r < 0)
goto error;
r = sd_dhcp6_lease_get_valid_lifetime(client->lease, &lifetime_valid);
if (r < 0)
goto error;
lifetime_t2 = client_timeout_compute_random(lifetime_t2);
lifetime_t1 = client_timeout_compute_random(MIN(lifetime_t1, lifetime_t2));
if (lifetime_t1 == USEC_INFINITY) {
log_dhcp6_client(client, "Infinite T1");
event_source_disable(client->timeout_t1);
} else {
log_dhcp6_client(client, "T1 expires in %s", FORMAT_TIMESPAN(lifetime_t1, USEC_PER_SEC));
r = event_reset_time_relative(client->event, &client->timeout_t1,
CLOCK_BOOTTIME,
lifetime_t1, 10 * USEC_PER_SEC,
client_timeout_t1, client,
client->event_priority, "dhcp6-t1-timeout", true);
if (r < 0)
goto error;
}
if (lifetime_t2 == USEC_INFINITY) {
log_dhcp6_client(client, "Infinite T2");
event_source_disable(client->timeout_t2);
} else {
log_dhcp6_client(client, "T2 expires in %s", FORMAT_TIMESPAN(lifetime_t2, USEC_PER_SEC));
r = event_reset_time_relative(client->event, &client->timeout_t2,
CLOCK_BOOTTIME,
lifetime_t2, 10 * USEC_PER_SEC,
client_timeout_t2, client,
client->event_priority, "dhcp6-t2-timeout", true);
if (r < 0)
goto error;
}
if (lifetime_valid == USEC_INFINITY) {
log_dhcp6_client(client, "Infinite valid lifetime");
event_source_disable(client->timeout_expire);
} else {
log_dhcp6_client(client, "Valid lifetime expires in %s", FORMAT_TIMESPAN(lifetime_valid, USEC_PER_SEC));
r = event_reset_time_relative(client->event, &client->timeout_expire,
CLOCK_BOOTTIME,
lifetime_valid, USEC_PER_SEC,
client_timeout_expire, client,
client->event_priority, "dhcp6-lease-expire", true);
if (r < 0)
goto error;
}
client_set_state(client, DHCP6_STATE_BOUND);
client_notify(client, SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE);
return 0;
error:
client_stop(client, r);
return r;
}
static int log_invalid_message_type(sd_dhcp6_client *client, const DHCP6Message *message) {
const char *type_str;
assert(client);
assert(message);
type_str = dhcp6_message_type_to_string(message->type);
if (type_str)
return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
"Received unexpected %s message, ignoring.", type_str);
else
return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
"Received unsupported message type %u, ignoring.", message->type);
}
static int client_process_information(
sd_dhcp6_client *client,
DHCP6Message *message,
size_t len,
const triple_timestamp *timestamp,
const struct in6_addr *server_address) {
_cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL;
int r;
assert(client);
assert(message);
if (message->type != DHCP6_MESSAGE_REPLY)
return log_invalid_message_type(client, message);
r = dhcp6_lease_new_from_message(client, message, len, timestamp, server_address, &lease);
if (r < 0)
return log_dhcp6_client_errno(client, r, "Failed to process received reply message, ignoring: %m");
log_dhcp6_client(client, "Processed %s message", dhcp6_message_type_to_string(message->type));
sd_dhcp6_lease_unref(client->lease);
client->lease = TAKE_PTR(lease);
/* Do not call client_stop() here, as it frees the acquired lease. */
(void) event_source_disable(client->receive_message);
(void) event_source_disable(client->timeout_resend);
client_set_state(client, DHCP6_STATE_STOPPED);
client_notify(client, SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST);
return 0;
}
static int client_process_reply(
sd_dhcp6_client *client,
DHCP6Message *message,
size_t len,
const triple_timestamp *timestamp,
const struct in6_addr *server_address) {
_cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL;
int r;
assert(client);
assert(message);
if (message->type != DHCP6_MESSAGE_REPLY)
return log_invalid_message_type(client, message);
r = dhcp6_lease_new_from_message(client, message, len, timestamp, server_address, &lease);
if (r == -EADDRNOTAVAIL) {
/* If NoBinding status code is received, we cannot request the address anymore.
* Let's restart transaction from the beginning. */
if (client->state == DHCP6_STATE_REQUEST)
/* The lease is not acquired yet, hence it is not necessary to notify the restart. */
client_cleanup(client);
else
/* We need to notify the previous lease was expired. */
client_stop(client, SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE);
return client_start_transaction(client, DHCP6_STATE_SOLICITATION);
}
if (r < 0)
return log_dhcp6_client_errno(client, r, "Failed to process received reply message, ignoring: %m");
log_dhcp6_client(client, "Processed %s message", dhcp6_message_type_to_string(message->type));
sd_dhcp6_lease_unref(client->lease);
client->lease = TAKE_PTR(lease);
return client_enter_bound_state(client);
}
static int client_process_advertise_or_rapid_commit_reply(
sd_dhcp6_client *client,
DHCP6Message *message,
size_t len,
const triple_timestamp *timestamp,
const struct in6_addr *server_address) {
_cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL;
uint8_t pref_advertise, pref_lease = 0;
int r;
assert(client);
assert(message);
if (!IN_SET(message->type, DHCP6_MESSAGE_ADVERTISE, DHCP6_MESSAGE_REPLY))
return log_invalid_message_type(client, message);
r = dhcp6_lease_new_from_message(client, message, len, timestamp, server_address, &lease);
if (r < 0)
return log_dhcp6_client_errno(client, r, "Failed to process received %s message, ignoring: %m",
dhcp6_message_type_to_string(message->type));
if (message->type == DHCP6_MESSAGE_REPLY) {
bool rapid_commit;
if (!client->rapid_commit)
return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
"Received unexpected reply message, even we sent a solicit message without the rapid commit option, ignoring.");
r = dhcp6_lease_get_rapid_commit(lease, &rapid_commit);
if (r < 0)
return r;
if (!rapid_commit)
return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
"Received reply message without rapid commit flag, ignoring.");
log_dhcp6_client(client, "Processed %s message", dhcp6_message_type_to_string(message->type));
sd_dhcp6_lease_unref(client->lease);
client->lease = TAKE_PTR(lease);
return client_enter_bound_state(client);
}
r = dhcp6_lease_get_preference(lease, &pref_advertise);
if (r < 0)
return r;
if (client->lease) {
r = dhcp6_lease_get_preference(client->lease, &pref_lease);
if (r < 0)
return r;
}
log_dhcp6_client(client, "Processed %s message", dhcp6_message_type_to_string(message->type));
if (!client->lease || pref_advertise > pref_lease) {
/* If this is the first advertise message or has higher preference, then save the lease. */
sd_dhcp6_lease_unref(client->lease);
client->lease = TAKE_PTR(lease);
}
if (pref_advertise == 255 || client->retransmit_count > 1)
(void) client_start_transaction(client, DHCP6_STATE_REQUEST);
return 0;
}
static int client_receive_message(
sd_event_source *s,
int fd, uint32_t
revents,
void *userdata) {
sd_dhcp6_client *client = ASSERT_PTR(userdata);
DHCP6_CLIENT_DONT_DESTROY(client);
/* This needs to be initialized with zero. See #20741.
* The issue is fixed on glibc-2.35 (8fba672472ae0055387e9315fc2eddfa6775ca79). */
CMSG_BUFFER_TYPE(CMSG_SPACE_TIMEVAL) control = {};
struct iovec iov;
union sockaddr_union sa = {};
struct msghdr msg = {
.msg_name = &sa.sa,
.msg_namelen = sizeof(sa),
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = &control,
.msg_controllen = sizeof(control),
};
triple_timestamp t;
_cleanup_free_ DHCP6Message *message = NULL;
struct in6_addr *server_address = NULL;
ssize_t buflen, len;
buflen = next_datagram_size_fd(fd);
if (ERRNO_IS_NEG_TRANSIENT(buflen) || ERRNO_IS_NEG_DISCONNECT(buflen))
return 0;
if (buflen < 0) {
log_dhcp6_client_errno(client, buflen, "Failed to determine datagram size to read, ignoring: %m");
return 0;
}
message = malloc(buflen);
if (!message)
return -ENOMEM;
iov = IOVEC_MAKE(message, buflen);
len = recvmsg_safe(fd, &msg, MSG_DONTWAIT);
if (ERRNO_IS_NEG_TRANSIENT(len) || ERRNO_IS_NEG_DISCONNECT(len))
return 0;
if (len < 0) {
log_dhcp6_client_errno(client, len, "Could not receive message from UDP socket, ignoring: %m");
return 0;
}
if ((size_t) len < sizeof(DHCP6Message)) {
log_dhcp6_client(client, "Too small to be DHCPv6 message: ignoring");
return 0;
}
/* msg_namelen == 0 happens when running the test-suite over a socketpair */
if (msg.msg_namelen > 0) {
if (msg.msg_namelen != sizeof(struct sockaddr_in6) || sa.in6.sin6_family != AF_INET6) {
log_dhcp6_client(client, "Received message from invalid source, ignoring.");
return 0;
}
server_address = &sa.in6.sin6_addr;
}
triple_timestamp_from_cmsg(&t, &msg);
if (client->transaction_id != (message->transaction_id & htobe32(0x00ffffff)))
return 0;
switch (client->state) {
case DHCP6_STATE_INFORMATION_REQUEST:
if (client_process_information(client, message, len, &t, server_address) < 0)
return 0;
break;
case DHCP6_STATE_SOLICITATION:
if (client_process_advertise_or_rapid_commit_reply(client, message, len, &t, server_address) < 0)
return 0;
break;
case DHCP6_STATE_REQUEST:
case DHCP6_STATE_RENEW:
case DHCP6_STATE_REBIND:
if (client_process_reply(client, message, len, &t, server_address) < 0)
return 0;
break;
case DHCP6_STATE_BOUND:
case DHCP6_STATE_STOPPED:
case DHCP6_STATE_STOPPING:
default:
assert_not_reached();
}
return 0;
}
static int client_send_release(sd_dhcp6_client *client) {
sd_dhcp6_lease *lease;
assert(client);
if (!client->send_release)
return 0;
if (sd_dhcp6_client_get_lease(client, &lease) < 0)
return 0;
if (!lease->ia_na && !lease->ia_pd)
return 0;
client_set_state(client, DHCP6_STATE_STOPPING);
return dhcp6_client_send_message(client);
}
int sd_dhcp6_client_stop(sd_dhcp6_client *client) {
int r;
if (!client)
return 0;
/* Intentionally ignoring failure to send DHCP6 release. The DHCPv6 client
* engine is about to release its UDP socket unconditionally. */
r = client_send_release(client);
if (r < 0)
log_dhcp6_client_errno(client, r,
"Failed to send DHCPv6 release message, ignoring: %m");
client_stop(client, SD_DHCP6_CLIENT_EVENT_STOP);
client->receive_message = sd_event_source_unref(client->receive_message);
client->fd = safe_close(client->fd);
return 0;
}
int sd_dhcp6_client_is_running(sd_dhcp6_client *client) {
if (!client)
return false;
return client->state != DHCP6_STATE_STOPPED;
}
int sd_dhcp6_client_start(sd_dhcp6_client *client) {
DHCP6State state = DHCP6_STATE_SOLICITATION;
int r;
assert_return(client, -EINVAL);
assert_return(client->event, -EINVAL);
assert_return(client->ifindex > 0, -EINVAL);
assert_return(in6_addr_is_link_local(&client->local_address) > 0, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
assert_return(client->information_request || client->request_ia != 0, -EINVAL);
/* Even if the client is in the STOPPED state, the lease acquired in the previous information
* request may be stored. */
client->lease = sd_dhcp6_lease_unref(client->lease);
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)
return log_dhcp6_client_errno(client, r,
"Failed to bind to UDP socket at address %s: %m",
IN6_ADDR_TO_STRING(&client->local_address));
client->fd = r;
}
if (!client->receive_message) {
_cleanup_(sd_event_source_disable_unrefp) sd_event_source *s = NULL;
r = sd_event_add_io(client->event, &s, client->fd, EPOLLIN, client_receive_message, client);
if (r < 0)
return r;
r = sd_event_source_set_priority(s, client->event_priority);
if (r < 0)
return r;
r = sd_event_source_set_description(s, "dhcp6-receive-message");
if (r < 0)
return r;
client->receive_message = TAKE_PTR(s);
}
if (client->information_request) {
usec_t t = now(CLOCK_MONOTONIC);
if (t < usec_add(client->information_request_time_usec, client->information_refresh_time_usec))
return 0;
client->information_request_time_usec = t;
state = DHCP6_STATE_INFORMATION_REQUEST;
}
log_dhcp6_client(client, "Starting in %s mode",
client->information_request ? "Information request" : "Solicit");
return client_start_transaction(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);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
if (event)
client->event = sd_event_ref(event);
else {
r = sd_event_default(&client->event);
if (r < 0)
return r;
}
client->event_priority = priority;
return 0;
}
int sd_dhcp6_client_detach_event(sd_dhcp6_client *client) {
assert_return(client, -EINVAL);
assert_return(!sd_dhcp6_client_is_running(client), -EBUSY);
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;
}
int sd_dhcp6_client_attach_device(sd_dhcp6_client *client, sd_device *dev) {
assert_return(client, -EINVAL);
return device_unref_and_replace_new_ref(client->dev, dev);
}
static sd_dhcp6_client *dhcp6_client_free(sd_dhcp6_client *client) {
if (!client)
return NULL;
sd_dhcp6_lease_unref(client->lease);
sd_event_source_disable_unref(client->receive_message);
sd_event_source_disable_unref(client->timeout_resend);
sd_event_source_disable_unref(client->timeout_expire);
sd_event_source_disable_unref(client->timeout_t1);
sd_event_source_disable_unref(client->timeout_t2);
sd_event_unref(client->event);
client->fd = safe_close(client->fd);
sd_device_unref(client->dev);
free(client->req_opts);
free(client->fqdn);
free(client->mudurl);
dhcp6_ia_clear_addresses(&client->ia_pd);
ordered_hashmap_free(client->extra_options);
ordered_set_free(client->vendor_options);
strv_free(client->user_class);
strv_free(client->vendor_class);
free(client->ifname);
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;
assert_return(ret, -EINVAL);
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_ia = DHCP6_REQUEST_IA_NA | DHCP6_REQUEST_IA_PD,
.fd = -EBADF,
.rapid_commit = true,
};
*ret = TAKE_PTR(client);
return 0;
}
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