SymbX/systemd
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
e9eaa66ed832d3dadeaa4692d3cc5ab3e2ea3542
systemd/src/network/networkd-dhcp6.c
T

948 lines
34 KiB
C
Raw Blame History

/* SPDX-License-Identifier: LGPL-2.1-or-later */
/***
Copyright © 2014 Intel Corporation. All rights reserved.
***/
#include <linux/if_addr.h>
#include <stdio.h>
#include "sd-dhcp6-protocol.h"
#include "conf-parser.h"
#include "dhcp6-client-internal.h"
#include "dhcp6-lease-internal.h"
#include "errno-util.h"
#include "hashmap.h"
#include "hostname-setup.h"
#include "networkd-address.h"
#include "networkd-dhcp-prefix-delegation.h"
#include "networkd-dhcp6.h"
#include "networkd-dhcp6-bus.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "networkd-ntp.h"
#include "networkd-queue.h"
#include "networkd-route.h"
#include "networkd-state-file.h"
#include "set.h"
#include "string-table.h"
#include "string-util.h"
bool link_dhcp6_with_address_enabled(Link *link) {
if (!link_dhcp6_enabled(link))
return false;
return link->network->dhcp6_use_address;
}
static DHCP6ClientStartMode link_get_dhcp6_client_start_mode(Link *link) {
assert(link);
if (!link->network)
return DHCP6_CLIENT_START_MODE_NO;
/* When WithoutRA= is explicitly specified, then honor it. */
if (link->network->dhcp6_client_start_mode >= 0)
return link->network->dhcp6_client_start_mode;
/* When this interface itself is an uplink interface, then start dhcp6 client in solicit mode. */
if (dhcp_pd_is_uplink(link, link, /* accept_auto = */ false))
return DHCP6_CLIENT_START_MODE_SOLICIT;
/* Otherwise, start dhcp6 client when RA is received. */
return DHCP6_CLIENT_START_MODE_NO;
}
static int dhcp6_remove(Link *link, bool only_marked) {
Address *address;
Route *route;
int ret = 0;
assert(link);
assert(link->manager);
if (!only_marked)
link->dhcp6_configured = false;
SET_FOREACH(route, link->manager->routes) {
if (route->source != NETWORK_CONFIG_SOURCE_DHCP6)
continue;
if (only_marked && !route_is_marked(route))
continue;
RET_GATHER(ret, route_remove_and_cancel(route, link->manager));
}
SET_FOREACH(address, link->addresses) {
if (address->source != NETWORK_CONFIG_SOURCE_DHCP6)
continue;
if (only_marked && !address_is_marked(address))
continue;
RET_GATHER(ret, address_remove_and_cancel(address, link));
}
return ret;
}
static int dhcp6_address_ready_callback(Address *address) {
Address *a;
assert(address);
assert(address->link);
SET_FOREACH(a, address->link->addresses)
if (a->source == NETWORK_CONFIG_SOURCE_DHCP6)
a->callback = NULL;
return dhcp6_check_ready(address->link);
}
int dhcp6_check_ready(Link *link) {
int r;
assert(link);
assert(link->network);
if (link->dhcp6_messages > 0) {
log_link_debug(link, "%s(): DHCPv6 addresses and routes are not set.", __func__);
return 0;
}
if (link->network->dhcp6_use_address &&
sd_dhcp6_lease_has_address(link->dhcp6_lease) &&
!link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP6)) {
Address *address;
SET_FOREACH(address, link->addresses)
if (address->source == NETWORK_CONFIG_SOURCE_DHCP6)
address->callback = dhcp6_address_ready_callback;
log_link_debug(link, "%s(): no DHCPv6 address is ready.", __func__);
return 0;
}
link->dhcp6_configured = true;
log_link_debug(link, "DHCPv6 addresses and routes set.");
r = dhcp6_remove(link, /* only_marked = */ true);
if (r < 0)
return r;
r = link_request_stacked_netdevs(link, NETDEV_LOCAL_ADDRESS_DHCP6);
if (r < 0)
return r;
link_check_ready(link);
return 0;
}
static int dhcp6_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Address *address) {
int r;
assert(link);
assert(address);
r = address_configure_handler_internal(m, link, address);
if (r <= 0)
return r;
r = dhcp6_check_ready(link);
if (r < 0)
link_enter_failed(link);
return 1;
}
static int verify_dhcp6_address(Link *link, const Address *address) {
assert(link);
assert(address);
assert(address->family == AF_INET6);
Address *existing = NULL;
(void) address_get_harder(link, address, &existing);
if (!existing || address_can_update(existing, address)) {
log_link_full(link,
/* Downgrade the log level if the address already exists or has been requested. */
existing ? LOG_DEBUG : LOG_INFO,
"DHCPv6 address %s (valid %s, preferred %s)",
IN6_ADDR_PREFIX_TO_STRING(&address->in_addr.in6, address->prefixlen),
FORMAT_LIFETIME(address->lifetime_valid_usec),
FORMAT_LIFETIME(address->lifetime_preferred_usec));
return 0;
}
bool by_ndisc = existing->source == NETWORK_CONFIG_SOURCE_NDISC;
log_link_full(link,
/* Downgrade the log level if we have logged about the conflict previously. */
existing->also_requested_by_dhcp6 ? LOG_DEBUG : LOG_WARNING,
"Ignoring DHCPv6 address %s (valid %s, preferred %s) which conflicts with %s%s.%s",
IN6_ADDR_PREFIX_TO_STRING(&address->in_addr.in6, address->prefixlen),
FORMAT_LIFETIME(address->lifetime_valid_usec),
FORMAT_LIFETIME(address->lifetime_preferred_usec),
IN6_ADDR_PREFIX_TO_STRING(&existing->in_addr.in6, existing->prefixlen),
by_ndisc ? " assigned by NDisc" : "",
by_ndisc ? "\nHint: use IPv6Token= setting to change the address generated by NDisc or set UseAutonomousPrefix=no." : "");
existing->also_requested_by_dhcp6 = true;
return -EEXIST;
}
static int dhcp6_request_address(
Link *link,
const struct in6_addr *server_address,
const struct in6_addr *ip6_addr,
usec_t lifetime_preferred_usec,
usec_t lifetime_valid_usec) {
_cleanup_(address_unrefp) Address *addr = NULL;
Address *existing;
int r;
r = address_new(&addr);
if (r < 0)
return log_oom();
addr->source = NETWORK_CONFIG_SOURCE_DHCP6;
addr->provider.in6 = *server_address;
addr->family = AF_INET6;
addr->in_addr.in6 = *ip6_addr;
addr->flags = IFA_F_NOPREFIXROUTE;
addr->prefixlen = 128;
addr->lifetime_preferred_usec = lifetime_preferred_usec;
addr->lifetime_valid_usec = lifetime_valid_usec;
if (verify_dhcp6_address(link, addr) < 0)
return 0;
r = free_and_strdup_warn(&addr->netlabel, link->network->dhcp6_netlabel);
if (r < 0)
return r;
if (address_get(link, addr, &existing) < 0)
link->dhcp6_configured = false;
else
address_unmark(existing);
r = link_request_address(link, addr, &link->dhcp6_messages,
dhcp6_address_handler, NULL);
if (r < 0)
return log_link_error_errno(link, r, "Failed to request DHCPv6 address %s/128: %m",
IN6_ADDR_TO_STRING(ip6_addr));
return 0;
}
static int dhcp6_address_acquired(Link *link) {
struct in6_addr server_address;
int r;
assert(link);
assert(link->network);
assert(link->dhcp6_lease);
if (!link->network->dhcp6_use_address)
return 0;
r = sd_dhcp6_lease_get_server_address(link->dhcp6_lease, &server_address);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to get server address of DHCPv6 lease: %m");
FOREACH_DHCP6_ADDRESS(link->dhcp6_lease) {
usec_t lifetime_preferred_usec, lifetime_valid_usec;
struct in6_addr ip6_addr;
r = sd_dhcp6_lease_get_address(link->dhcp6_lease, &ip6_addr);
if (r < 0)
return r;
r = sd_dhcp6_lease_get_address_lifetime_timestamp(link->dhcp6_lease, CLOCK_BOOTTIME,
&lifetime_preferred_usec, &lifetime_valid_usec);
if (r < 0)
return r;
r = dhcp6_request_address(link, &server_address, &ip6_addr,
lifetime_preferred_usec,
lifetime_valid_usec);
if (r < 0)
return r;
}
return 0;
}
static int dhcp6_request_hostname(Link *link) {
_cleanup_free_ char *hostname = NULL;
const char *dhcpname = NULL;
int r;
assert(link);
assert(link->network);
if (!link->network->dhcp6_use_hostname)
return 0;
r = sd_dhcp6_lease_get_fqdn(link->dhcp6_lease, &dhcpname);
if (r == -ENODATA)
return 0;
if (r < 0)
return r;
r = shorten_overlong(dhcpname, &hostname);
if (r < 0)
return log_link_warning_errno(link, r, "Unable to shorten overlong DHCP hostname '%s': %m", dhcpname);
if (r == 1)
log_link_notice(link, "Overlong DHCP hostname received, shortened from '%s' to '%s'", dhcpname, hostname);
r = manager_set_hostname(link->manager, hostname);
if (r < 0)
log_link_warning_errno(link, r, "Failed to set transient hostname to '%s', ignoring: %m", hostname);
return 0;
}
static int dhcp6_lease_ip_acquired(sd_dhcp6_client *client, Link *link) {
_cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease_old = NULL;
sd_dhcp6_lease *lease;
int r;
link_mark_addresses(link, NETWORK_CONFIG_SOURCE_DHCP6);
r = sd_dhcp6_client_get_lease(client, &lease);
if (r < 0)
return log_link_error_errno(link, r, "Failed to get DHCPv6 lease: %m");
lease_old = TAKE_PTR(link->dhcp6_lease);
link->dhcp6_lease = sd_dhcp6_lease_ref(lease);
r = dhcp6_request_hostname(link);
if (r < 0)
return r;
r = dhcp6_address_acquired(link);
if (r < 0)
return r;
if (sd_dhcp6_lease_has_pd_prefix(lease)) {
r = dhcp6_pd_prefix_acquired(link);
if (r < 0)
return r;
} else if (sd_dhcp6_lease_has_pd_prefix(lease_old))
/* When we had PD prefixes but not now, we need to remove them. */
dhcp6_pd_prefix_lost(link);
if (link->dhcp6_messages == 0) {
link->dhcp6_configured = true;
r = dhcp6_remove(link, /* only_marked = */ true);
if (r < 0)
return r;
} else
log_link_debug(link, "Setting DHCPv6 addresses and routes");
if (!link->dhcp6_configured)
link_set_state(link, LINK_STATE_CONFIGURING);
link_check_ready(link);
return 0;
}
static int dhcp6_lease_information_acquired(sd_dhcp6_client *client, Link *link) {
sd_dhcp6_lease *lease;
int r;
assert(client);
assert(link);
r = sd_dhcp6_client_get_lease(client, &lease);
if (r < 0)
return log_link_error_errno(link, r, "Failed to get DHCPv6 lease: %m");
unref_and_replace_full(link->dhcp6_lease, lease, sd_dhcp6_lease_ref, sd_dhcp6_lease_unref);
link_dirty(link);
return 0;
}
static int dhcp6_lease_lost(Link *link) {
int r;
assert(link);
assert(link->manager);
if (!link->dhcp6_lease)
return 0;
log_link_info(link, "DHCPv6 lease lost");
if (sd_dhcp6_lease_has_pd_prefix(link->dhcp6_lease))
dhcp6_pd_prefix_lost(link);
link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
r = dhcp6_remove(link, /* only_marked = */ false);
if (r < 0)
return r;
return 0;
}
static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) {
Link *link = ASSERT_PTR(userdata);
int r = 0;
assert(link->network);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
switch (event) {
case SD_DHCP6_CLIENT_EVENT_STOP:
case SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE:
case SD_DHCP6_CLIENT_EVENT_RETRANS_MAX:
r = dhcp6_lease_lost(link);
break;
case SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE:
r = dhcp6_lease_ip_acquired(client, link);
break;
case SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST:
r = dhcp6_lease_information_acquired(client, link);
break;
default:
if (event < 0)
log_link_warning_errno(link, event, "DHCPv6 error, ignoring: %m");
else
log_link_warning(link, "DHCPv6 unknown event: %d", event);
}
if (r < 0)
link_enter_failed(link);
}
int dhcp6_start_on_ra(Link *link, bool information_request) {
int r;
assert(link);
assert(link->dhcp6_client);
assert(link->network);
assert(in6_addr_is_link_local(&link->ipv6ll_address));
if (link_get_dhcp6_client_start_mode(link) != DHCP6_CLIENT_START_MODE_NO)
/* When WithoutRA= is specified, then the DHCPv6 client should be already running in
* the requested mode. Hence, ignore the requests by RA. */
return 0;
r = sd_dhcp6_client_is_running(link->dhcp6_client);
if (r < 0)
return r;
if (r > 0) {
int inf_req;
r = sd_dhcp6_client_get_information_request(link->dhcp6_client, &inf_req);
if (r < 0)
return r;
if (inf_req == information_request)
/* The client is already running in the requested mode. */
return 0;
if (!inf_req) {
log_link_debug(link,
"The DHCPv6 client is already running in the managed mode, "
"refusing to start the client in the information requesting mode.");
return 0;
}
log_link_debug(link,
"The DHCPv6 client is running in the information requesting mode. "
"Restarting the client in the managed mode.");
r = sd_dhcp6_client_stop(link->dhcp6_client);
if (r < 0)
return r;
} else {
r = sd_dhcp6_client_set_local_address(link->dhcp6_client, &link->ipv6ll_address);
if (r < 0)
return r;
}
r = sd_dhcp6_client_set_information_request(link->dhcp6_client, information_request);
if (r < 0)
return r;
r = sd_dhcp6_client_start(link->dhcp6_client);
if (r < 0)
return r;
return 0;
}
int dhcp6_start(Link *link) {
DHCP6ClientStartMode start_mode;
int r;
assert(link);
assert(link->network);
if (!link->dhcp6_client)
return 0;
if (!link_dhcp6_enabled(link))
return 0;
if (!link_has_carrier(link))
return 0;
if (sd_dhcp6_client_is_running(link->dhcp6_client) > 0)
return 0;
if (!in6_addr_is_link_local(&link->ipv6ll_address)) {
log_link_debug(link, "IPv6 link-local address is not set, delaying to start DHCPv6 client.");
return 0;
}
r = sd_dhcp6_client_set_local_address(link->dhcp6_client, &link->ipv6ll_address);
if (r < 0)
return r;
start_mode = link_get_dhcp6_client_start_mode(link);
if (start_mode == DHCP6_CLIENT_START_MODE_NO)
return 0;
r = sd_dhcp6_client_set_information_request(link->dhcp6_client,
start_mode == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
if (r < 0)
return r;
r = sd_dhcp6_client_start(link->dhcp6_client);
if (r < 0)
return r;
return 1;
}
static int dhcp6_set_hostname(sd_dhcp6_client *client, Link *link) {
_cleanup_free_ char *hostname = NULL;
const char *hn;
int r;
assert(link);
if (!link->network->dhcp6_send_hostname)
hn = NULL;
else if (link->network->dhcp6_hostname)
hn = link->network->dhcp6_hostname;
else {
r = gethostname_strict(&hostname);
if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to get hostname: %m");
hn = hostname;
}
r = sd_dhcp6_client_set_fqdn(client, hn);
if (r == -EINVAL && hostname)
/* Ignore error when the machine's hostname is not suitable to send in DHCP packet. */
log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m");
else if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set hostname: %m");
return 0;
}
static int dhcp6_set_identifier(Link *link, sd_dhcp6_client *client) {
const DUID *duid;
int r;
assert(link);
assert(link->network);
assert(client);
r = sd_dhcp6_client_set_mac(client, link->hw_addr.bytes, link->hw_addr.length, link->iftype);
if (r < 0)
return r;
if (link->network->dhcp6_iaid_set) {
r = sd_dhcp6_client_set_iaid(client, link->network->dhcp6_iaid);
if (r < 0)
return r;
}
duid = link_get_dhcp6_duid(link);
if (duid->raw_data_len == 0)
switch (duid->type) {
case DUID_TYPE_LLT:
r = sd_dhcp6_client_set_duid_llt(client, duid->llt_time);
break;
case DUID_TYPE_LL:
r = sd_dhcp6_client_set_duid_ll(client);
break;
case DUID_TYPE_EN:
r = sd_dhcp6_client_set_duid_en(client);
break;
case DUID_TYPE_UUID:
r = sd_dhcp6_client_set_duid_uuid(client);
break;
default:
r = sd_dhcp6_client_set_duid_raw(client, duid->type, NULL, 0);
}
else
r = sd_dhcp6_client_set_duid_raw(client, duid->type, duid->raw_data, duid->raw_data_len);
if (r < 0)
return r;
return 0;
}
static int dhcp6_configure(Link *link) {
_cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL;
sd_dhcp6_option *vendor_option;
sd_dhcp6_option *send_option;
void *request_options;
int r;
assert(link);
assert(link->network);
if (link->dhcp6_client)
return log_link_debug_errno(link, SYNTHETIC_ERRNO(EBUSY), "DHCPv6 client is already configured.");
r = sd_dhcp6_client_new(&client);
if (r == -ENOMEM)
return log_oom_debug();
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to create DHCPv6 client: %m");
r = sd_dhcp6_client_attach_event(client, link->manager->event, 0);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to attach event: %m");
r = sd_dhcp6_client_attach_device(client, link->dev);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to attach device: %m");
r = dhcp6_set_identifier(link, client);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set identifier: %m");
ORDERED_HASHMAP_FOREACH(send_option, link->network->dhcp6_client_send_options) {
r = sd_dhcp6_client_add_option(client, send_option);
if (r == -EEXIST)
continue;
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set option: %m");
}
r = dhcp6_set_hostname(client, link);
if (r < 0)
return r;
r = sd_dhcp6_client_set_ifindex(client, link->ifindex);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set ifindex: %m");
if (link->network->dhcp6_mudurl) {
r = sd_dhcp6_client_set_request_mud_url(client, link->network->dhcp6_mudurl);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set MUD URL: %m");
}
if (link_get_use_dns(link, NETWORK_CONFIG_SOURCE_DHCP6)) {
r = sd_dhcp6_client_set_request_option(client, SD_DHCP6_OPTION_DNS_SERVER);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to request DNS servers: %m");
}
if (link_get_use_domains(link, NETWORK_CONFIG_SOURCE_DHCP6) > 0) {
r = sd_dhcp6_client_set_request_option(client, SD_DHCP6_OPTION_DOMAIN);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to request domains: %m");
}
if (link_get_use_dnr(link, NETWORK_CONFIG_SOURCE_DHCP6)) {
r = sd_dhcp6_client_set_request_option(client, SD_DHCP6_OPTION_V6_DNR);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to request DNR: %m");
}
if (link->network->dhcp6_use_captive_portal > 0) {
r = sd_dhcp6_client_set_request_option(client, SD_DHCP6_OPTION_CAPTIVE_PORTAL);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to request captive portal: %m");
}
if (link_get_use_ntp(link, NETWORK_CONFIG_SOURCE_DHCP6)) {
r = sd_dhcp6_client_set_request_option(client, SD_DHCP6_OPTION_NTP_SERVER);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to request NTP servers: %m");
/* If the server does not provide NTP servers, then we fallback to use SNTP servers. */
r = sd_dhcp6_client_set_request_option(client, SD_DHCP6_OPTION_SNTP_SERVER);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to request SNTP servers: %m");
}
if (link->network->dhcp6_use_sip > 0) {
r = sd_dhcp6_client_set_request_option(client, SD_DHCP6_OPTION_SIP_SERVER_ADDRESS);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to request SIP servers: %m");
r = sd_dhcp6_client_set_request_option(client, SD_DHCP6_OPTION_SIP_SERVER_DOMAIN_NAME);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to request SIP server domain names: %m");
}
SET_FOREACH(request_options, link->network->dhcp6_request_options) {
uint32_t option = PTR_TO_UINT32(request_options);
r = sd_dhcp6_client_set_request_option(client, option);
if (r == -EEXIST) {
log_link_debug(link, "DHCPv6 CLIENT: Failed to set request flag for '%u' already exists, ignoring.", option);
continue;
}
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set request flag for '%u': %m", option);
}
if (link->network->dhcp6_user_class) {
r = sd_dhcp6_client_set_request_user_class(client, link->network->dhcp6_user_class);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set user class: %m");
}
if (link->network->dhcp6_vendor_class) {
r = sd_dhcp6_client_set_request_vendor_class(client, link->network->dhcp6_vendor_class);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set vendor class: %m");
}
ORDERED_HASHMAP_FOREACH(vendor_option, link->network->dhcp6_client_send_vendor_options) {
r = sd_dhcp6_client_add_vendor_option(client, vendor_option);
if (r == -EEXIST)
continue;
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set vendor option: %m");
}
r = sd_dhcp6_client_set_callback(client, dhcp6_handler, link);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set callback: %m");
r = dhcp6_client_set_state_callback(client, dhcp6_client_callback_bus, link);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set state change callback: %m");
r = sd_dhcp6_client_set_prefix_delegation(client, link->network->dhcp6_use_pd_prefix);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to %s requesting prefixes to be delegated: %m",
enable_disable(link->network->dhcp6_use_pd_prefix));
/* Even if UseAddress=no, we need to request IA_NA, as the dhcp6 client may be started in solicit mode. */
r = sd_dhcp6_client_set_address_request(client, link->network->dhcp6_use_pd_prefix ? link->network->dhcp6_use_address : true);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to %s requesting address: %m",
enable_disable(link->network->dhcp6_use_address));
if (link->network->dhcp6_pd_prefix_length > 0) {
r = sd_dhcp6_client_set_prefix_delegation_hint(client,
link->network->dhcp6_pd_prefix_length,
&link->network->dhcp6_pd_prefix_hint);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv6 CLIENT: Failed to set prefix delegation hint: %m");
}
r = sd_dhcp6_client_set_rapid_commit(client, link->network->dhcp6_use_rapid_commit);
if (r < 0)
return log_link_debug_errno(link, r,
"DHCPv6 CLIENT: Failed to %s rapid commit: %m",
enable_disable(link->network->dhcp6_use_rapid_commit));
r = sd_dhcp6_client_set_send_release(client, link->network->dhcp6_send_release);
if (r < 0)
return log_link_debug_errno(link, r,
"DHCPv6 CLIENT: Failed to %s sending release message on stop: %m",
enable_disable(link->network->dhcp6_send_release));
link->dhcp6_client = TAKE_PTR(client);
return 0;
}
int dhcp6_update_mac(Link *link) {
bool restart;
int r;
assert(link);
if (!link->dhcp6_client)
return 0;
restart = sd_dhcp6_client_is_running(link->dhcp6_client) > 0;
if (restart) {
r = sd_dhcp6_client_stop(link->dhcp6_client);
if (r < 0)
return r;
}
r = dhcp6_set_identifier(link, link->dhcp6_client);
if (r < 0)
return r;
if (restart) {
r = sd_dhcp6_client_start(link->dhcp6_client);
if (r < 0)
return log_link_warning_errno(link, r, "Could not restart DHCPv6 client: %m");
}
return 0;
}
static int dhcp6_process_request(Request *req, Link *link, void *userdata) {
int r;
assert(link);
if (!link_is_ready_to_configure(link, /* allow_unmanaged = */ false))
return 0;
r = dhcp_configure_duid(link, link_get_dhcp6_duid(link));
if (r <= 0)
return r;
r = dhcp6_configure(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to configure DHCPv6 client: %m");
r = ndisc_start(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
r = dhcp6_start(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
log_link_debug(link, "DHCPv6 client is configured%s.",
r > 0 ? ", acquiring DHCPv6 lease" : "");
return 1;
}
int link_request_dhcp6_client(Link *link) {
int r;
assert(link);
if (!link_dhcp6_enabled(link) && !link_ndisc_enabled(link))
return 0;
if (link->dhcp6_client)
return 0;
r = link_queue_request(link, REQUEST_TYPE_DHCP6_CLIENT, dhcp6_process_request, NULL);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to request configuring of the DHCPv6 client: %m");
log_link_debug(link, "Requested configuring of the DHCPv6 client.");
return 0;
}
int link_drop_dhcp6_config(Link *link, Network *network) {
int ret = 0;
assert(link);
assert(link->network);
if (link->network == network)
return 0; /* .network file is unchanged. It is not necessary to reconfigure the client. */
if (!link_dhcp6_enabled(link)) {
/* DHCPv6 client is disabled. Stop the client if it is running and drop the lease. */
ret = sd_dhcp6_client_stop(link->dhcp6_client);
/* Also explicitly drop DHCPv6 addresses and routes. See also link_drop_dhcp4_config(). */
RET_GATHER(ret, dhcp6_remove(link, /* only_marked = */ false));
}
/* Even if the client is currently enabled and also enabled in the new .network file, detailed
* settings for the client may be different. Let's unref() the client. But do not unref() the lease.
* it will be unref()ed later when a new lease is acquired. */
link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
return ret;
}
int link_serialize_dhcp6_client(Link *link, FILE *f) {
_cleanup_free_ char *duid = NULL;
uint32_t iaid;
int r;
assert(link);
if (!link->dhcp6_client)
return 0;
r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
if (r >= 0)
fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
r = sd_dhcp6_client_get_duid_as_string(link->dhcp6_client, &duid);
if (r >= 0)
fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
return 0;
}
int config_parse_dhcp6_pd_prefix_hint(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = ASSERT_PTR(userdata);
union in_addr_union u;
unsigned char prefixlen;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
r = in_addr_prefix_from_string(rvalue, AF_INET6, &u, &prefixlen);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse %s=%s, ignoring assignment.", lvalue, rvalue);
return 0;
}
if (prefixlen < 1 || prefixlen > 128) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Invalid prefix length in %s=%s, ignoring assignment.", lvalue, rvalue);
return 0;
}
network->dhcp6_pd_prefix_hint = u.in6;
network->dhcp6_pd_prefix_length = prefixlen;
return 0;
}
DEFINE_CONFIG_PARSE_ENUM(config_parse_dhcp6_client_start_mode, dhcp6_client_start_mode, DHCP6ClientStartMode);
static const char* const dhcp6_client_start_mode_table[_DHCP6_CLIENT_START_MODE_MAX] = {
[DHCP6_CLIENT_START_MODE_NO] = "no",
[DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST] = "information-request",
[DHCP6_CLIENT_START_MODE_SOLICIT] = "solicit",
};
DEFINE_STRING_TABLE_LOOKUP(dhcp6_client_start_mode, DHCP6ClientStartMode);
Reference in New Issue View Git Blame Copy Permalink