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-rw-r--r--src/grp-network/networkd-link.c3300
1 files changed, 3300 insertions, 0 deletions
diff --git a/src/grp-network/networkd-link.c b/src/grp-network/networkd-link.c
new file mode 100644
index 0000000000..a021fc886f
--- /dev/null
+++ b/src/grp-network/networkd-link.c
@@ -0,0 +1,3300 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Tom Gundersen <teg@jklm.no>
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <netinet/ether.h>
+#include <linux/if.h>
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "bus-util.h"
+#include "dhcp-lease-internal.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "netlink-util.h"
+#include "network-internal.h"
+#include "networkd.h"
+#include "networkd-lldp-tx.h"
+#include "set.h"
+#include "socket-util.h"
+#include "stdio-util.h"
+#include "string-table.h"
+#include "udev-util.h"
+#include "util.h"
+#include "virt.h"
+
+static bool link_dhcp6_enabled(Link *link) {
+ assert(link);
+
+ if (!socket_ipv6_is_supported())
+ return false;
+
+ if (link->flags & IFF_LOOPBACK)
+ return false;
+
+ if (!link->network)
+ return false;
+
+ return link->network->dhcp & ADDRESS_FAMILY_IPV6;
+}
+
+static bool link_dhcp4_enabled(Link *link) {
+ assert(link);
+
+ if (link->flags & IFF_LOOPBACK)
+ return false;
+
+ if (!link->network)
+ return false;
+
+ return link->network->dhcp & ADDRESS_FAMILY_IPV4;
+}
+
+static bool link_dhcp4_server_enabled(Link *link) {
+ assert(link);
+
+ if (link->flags & IFF_LOOPBACK)
+ return false;
+
+ if (!link->network)
+ return false;
+
+ return link->network->dhcp_server;
+}
+
+static bool link_ipv4ll_enabled(Link *link) {
+ assert(link);
+
+ if (link->flags & IFF_LOOPBACK)
+ return false;
+
+ if (!link->network)
+ return false;
+
+ return link->network->link_local & ADDRESS_FAMILY_IPV4;
+}
+
+static bool link_ipv6ll_enabled(Link *link) {
+ assert(link);
+
+ if (!socket_ipv6_is_supported())
+ return false;
+
+ if (link->flags & IFF_LOOPBACK)
+ return false;
+
+ if (!link->network)
+ return false;
+
+ return link->network->link_local & ADDRESS_FAMILY_IPV6;
+}
+
+static bool link_ipv6_enabled(Link *link) {
+ assert(link);
+
+ if (!socket_ipv6_is_supported())
+ return false;
+
+ return link_dhcp6_enabled(link) || link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
+}
+
+static bool link_lldp_rx_enabled(Link *link) {
+ assert(link);
+
+ if (link->flags & IFF_LOOPBACK)
+ return false;
+
+ if (link->iftype != ARPHRD_ETHER)
+ return false;
+
+ if (!link->network)
+ return false;
+
+ if (link->network->bridge)
+ return false;
+
+ return link->network->lldp_mode != LLDP_MODE_NO;
+}
+
+static bool link_lldp_emit_enabled(Link *link) {
+ assert(link);
+
+ if (link->flags & IFF_LOOPBACK)
+ return false;
+
+ if (link->iftype != ARPHRD_ETHER)
+ return false;
+
+ if (!link->network)
+ return false;
+
+ return link->network->lldp_emit != LLDP_EMIT_NO;
+}
+
+static bool link_ipv4_forward_enabled(Link *link) {
+ assert(link);
+
+ if (link->flags & IFF_LOOPBACK)
+ return false;
+
+ if (!link->network)
+ return false;
+
+ if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
+ return false;
+
+ return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
+}
+
+static bool link_ipv6_forward_enabled(Link *link) {
+ assert(link);
+
+ if (!socket_ipv6_is_supported())
+ return false;
+
+ if (link->flags & IFF_LOOPBACK)
+ return false;
+
+ if (!link->network)
+ return false;
+
+ if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
+ return false;
+
+ return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
+}
+
+static bool link_proxy_arp_enabled(Link *link) {
+ assert(link);
+
+ if (link->flags & IFF_LOOPBACK)
+ return false;
+
+ if (!link->network)
+ return false;
+
+ if (link->network->proxy_arp < 0)
+ return false;
+
+ return true;
+}
+
+static bool link_ipv6_accept_ra_enabled(Link *link) {
+ assert(link);
+
+ if (!socket_ipv6_is_supported())
+ return false;
+
+ if (link->flags & IFF_LOOPBACK)
+ return false;
+
+ if (!link->network)
+ return false;
+
+ /* If unset use system default (enabled if local forwarding is disabled.
+ * disabled if local forwarding is enabled).
+ * If set, ignore or enforce RA independent of local forwarding state.
+ */
+ if (link->network->ipv6_accept_ra < 0)
+ /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
+ return !link_ipv6_forward_enabled(link);
+ else if (link->network->ipv6_accept_ra > 0)
+ /* accept RA even if ip_forward is enabled */
+ return true;
+ else
+ /* ignore RA */
+ return false;
+}
+
+static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
+ assert(link);
+
+ if (!socket_ipv6_is_supported())
+ return _IPV6_PRIVACY_EXTENSIONS_INVALID;
+
+ if (link->flags & IFF_LOOPBACK)
+ return _IPV6_PRIVACY_EXTENSIONS_INVALID;
+
+ if (!link->network)
+ return _IPV6_PRIVACY_EXTENSIONS_INVALID;
+
+ return link->network->ipv6_privacy_extensions;
+}
+
+static int link_enable_ipv6(Link *link) {
+ const char *p = NULL;
+ bool disabled;
+ int r;
+
+ if (link->flags & IFF_LOOPBACK)
+ return 0;
+
+ disabled = !link_ipv6_enabled(link);
+
+ p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
+
+ r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m", disabled ? "disable" : "enable", link->ifname);
+ else {
+ if (disabled)
+ log_link_info(link, "IPv6 disabled for interface: %m");
+ else
+ log_link_info(link, "IPv6 enabled for interface: %m");
+ }
+
+ return 0;
+}
+
+void link_update_operstate(Link *link) {
+ LinkOperationalState operstate;
+ assert(link);
+
+ if (link->kernel_operstate == IF_OPER_DORMANT)
+ operstate = LINK_OPERSTATE_DORMANT;
+ else if (link_has_carrier(link)) {
+ Address *address;
+ uint8_t scope = RT_SCOPE_NOWHERE;
+ Iterator i;
+
+ /* if we have carrier, check what addresses we have */
+ SET_FOREACH(address, link->addresses, i) {
+ if (!address_is_ready(address))
+ continue;
+
+ if (address->scope < scope)
+ scope = address->scope;
+ }
+
+ /* for operstate we also take foreign addresses into account */
+ SET_FOREACH(address, link->addresses_foreign, i) {
+ if (!address_is_ready(address))
+ continue;
+
+ if (address->scope < scope)
+ scope = address->scope;
+ }
+
+ if (scope < RT_SCOPE_SITE)
+ /* universally accessible addresses found */
+ operstate = LINK_OPERSTATE_ROUTABLE;
+ else if (scope < RT_SCOPE_HOST)
+ /* only link or site local addresses found */
+ operstate = LINK_OPERSTATE_DEGRADED;
+ else
+ /* no useful addresses found */
+ operstate = LINK_OPERSTATE_CARRIER;
+ } else if (link->flags & IFF_UP)
+ operstate = LINK_OPERSTATE_NO_CARRIER;
+ else
+ operstate = LINK_OPERSTATE_OFF;
+
+ if (link->operstate != operstate) {
+ link->operstate = operstate;
+ link_send_changed(link, "OperationalState", NULL);
+ link_dirty(link);
+ }
+}
+
+#define FLAG_STRING(string, flag, old, new) \
+ (((old ^ new) & flag) \
+ ? ((old & flag) ? (" -" string) : (" +" string)) \
+ : "")
+
+static int link_update_flags(Link *link, sd_netlink_message *m) {
+ unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
+ uint8_t operstate;
+ int r;
+
+ assert(link);
+
+ r = sd_rtnl_message_link_get_flags(m, &flags);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Could not get link flags: %m");
+
+ r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
+ if (r < 0)
+ /* if we got a message without operstate, take it to mean
+ the state was unchanged */
+ operstate = link->kernel_operstate;
+
+ if ((link->flags == flags) && (link->kernel_operstate == operstate))
+ return 0;
+
+ if (link->flags != flags) {
+ log_link_debug(link, "Flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
+ FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
+ FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
+ FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
+ FLAG_STRING("UP", IFF_UP, link->flags, flags),
+ FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
+ FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
+ FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
+ FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
+ FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
+ FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
+ FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
+ FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
+ FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
+ FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
+ FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
+ FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
+ FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
+ FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
+ FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
+
+ unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
+ IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
+ IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
+ IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
+ IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
+ IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
+ unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
+ unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
+
+ /* link flags are currently at most 18 bits, let's align to
+ * printing 20 */
+ if (unknown_flags_added)
+ log_link_debug(link,
+ "Unknown link flags gained: %#.5x (ignoring)",
+ unknown_flags_added);
+
+ if (unknown_flags_removed)
+ log_link_debug(link,
+ "Unknown link flags lost: %#.5x (ignoring)",
+ unknown_flags_removed);
+ }
+
+ link->flags = flags;
+ link->kernel_operstate = operstate;
+
+ link_update_operstate(link);
+
+ return 0;
+}
+
+static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
+ _cleanup_link_unref_ Link *link = NULL;
+ uint16_t type;
+ const char *ifname;
+ int r, ifindex;
+ unsigned short iftype;
+
+ assert(manager);
+ assert(message);
+ assert(ret);
+
+ r = sd_netlink_message_get_type(message, &type);
+ if (r < 0)
+ return r;
+ else if (type != RTM_NEWLINK)
+ return -EINVAL;
+
+ r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
+ if (r < 0)
+ return r;
+ else if (ifindex <= 0)
+ return -EINVAL;
+
+ r = sd_rtnl_message_link_get_type(message, &iftype);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
+ if (r < 0)
+ return r;
+
+ link = new0(Link, 1);
+ if (!link)
+ return -ENOMEM;
+
+ link->n_ref = 1;
+ link->manager = manager;
+ link->state = LINK_STATE_PENDING;
+ link->rtnl_extended_attrs = true;
+ link->ifindex = ifindex;
+ link->iftype = iftype;
+ link->ifname = strdup(ifname);
+ if (!link->ifname)
+ return -ENOMEM;
+
+ r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
+ if (r < 0)
+ log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
+
+ if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
+ return -ENOMEM;
+
+ if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
+ return -ENOMEM;
+
+ if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
+ return -ENOMEM;
+
+ r = hashmap_ensure_allocated(&manager->links, NULL);
+ if (r < 0)
+ return r;
+
+ r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
+ if (r < 0)
+ return r;
+
+ r = link_update_flags(link, message);
+ if (r < 0)
+ return r;
+
+ *ret = link;
+ link = NULL;
+
+ return 0;
+}
+
+static void link_free(Link *link) {
+ Address *address;
+ Iterator i;
+ Link *carrier;
+
+ if (!link)
+ return;
+
+ while (!set_isempty(link->addresses))
+ address_free(set_first(link->addresses));
+
+ while (!set_isempty(link->addresses_foreign))
+ address_free(set_first(link->addresses_foreign));
+
+ link->addresses = set_free(link->addresses);
+
+ link->addresses_foreign = set_free(link->addresses_foreign);
+
+ while ((address = link->pool_addresses)) {
+ LIST_REMOVE(addresses, link->pool_addresses, address);
+ address_free(address);
+ }
+
+ sd_dhcp_server_unref(link->dhcp_server);
+ sd_dhcp_client_unref(link->dhcp_client);
+ sd_dhcp_lease_unref(link->dhcp_lease);
+
+ link_lldp_emit_stop(link);
+
+ free(link->lease_file);
+
+ sd_lldp_unref(link->lldp);
+ free(link->lldp_file);
+
+ sd_ipv4ll_unref(link->ipv4ll);
+ sd_dhcp6_client_unref(link->dhcp6_client);
+ sd_ndisc_unref(link->ndisc_router_discovery);
+
+ if (link->manager)
+ hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
+
+ free(link->ifname);
+
+ (void)unlink(link->state_file);
+ free(link->state_file);
+
+ udev_device_unref(link->udev_device);
+
+ HASHMAP_FOREACH (carrier, link->bound_to_links, i)
+ hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
+ hashmap_free(link->bound_to_links);
+
+ HASHMAP_FOREACH (carrier, link->bound_by_links, i)
+ hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
+ hashmap_free(link->bound_by_links);
+
+ free(link);
+}
+
+Link *link_unref(Link *link) {
+ if (!link)
+ return NULL;
+
+ assert(link->n_ref > 0);
+
+ link->n_ref--;
+
+ if (link->n_ref > 0)
+ return NULL;
+
+ link_free(link);
+
+ return NULL;
+}
+
+Link *link_ref(Link *link) {
+ if (!link)
+ return NULL;
+
+ assert(link->n_ref > 0);
+
+ link->n_ref++;
+
+ return link;
+}
+
+int link_get(Manager *m, int ifindex, Link **ret) {
+ Link *link;
+
+ assert(m);
+ assert(ifindex);
+ assert(ret);
+
+ link = hashmap_get(m->links, INT_TO_PTR(ifindex));
+ if (!link)
+ return -ENODEV;
+
+ *ret = link;
+
+ return 0;
+}
+
+static void link_set_state(Link *link, LinkState state) {
+ assert(link);
+
+ if (link->state == state)
+ return;
+
+ link->state = state;
+
+ link_send_changed(link, "AdministrativeState", NULL);
+}
+
+static void link_enter_unmanaged(Link *link) {
+ assert(link);
+
+ log_link_debug(link, "Unmanaged");
+
+ link_set_state(link, LINK_STATE_UNMANAGED);
+
+ link_dirty(link);
+}
+
+static int link_stop_clients(Link *link) {
+ int r = 0, k;
+
+ assert(link);
+ assert(link->manager);
+ assert(link->manager->event);
+
+ if (link->dhcp_client) {
+ k = sd_dhcp_client_stop(link->dhcp_client);
+ if (k < 0)
+ r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
+ }
+
+ if (link->ipv4ll) {
+ k = sd_ipv4ll_stop(link->ipv4ll);
+ if (k < 0)
+ r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
+ }
+
+ if (link->dhcp6_client) {
+ k = sd_dhcp6_client_stop(link->dhcp6_client);
+ if (k < 0)
+ r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
+ }
+
+ if (link->ndisc_router_discovery) {
+ k = sd_ndisc_stop(link->ndisc_router_discovery);
+ if (k < 0)
+ r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
+ }
+
+ link_lldp_emit_stop(link);
+ return r;
+}
+
+void link_enter_failed(Link *link) {
+ assert(link);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return;
+
+ log_link_warning(link, "Failed");
+
+ link_set_state(link, LINK_STATE_FAILED);
+
+ link_stop_clients(link);
+
+ link_dirty(link);
+}
+
+static Address* link_find_dhcp_server_address(Link *link) {
+ Address *address;
+
+ assert(link);
+ assert(link->network);
+
+ /* The first statically configured address if there is any */
+ LIST_FOREACH(addresses, address, link->network->static_addresses) {
+
+ if (address->family != AF_INET)
+ continue;
+
+ if (in_addr_is_null(address->family, &address->in_addr))
+ continue;
+
+ return address;
+ }
+
+ /* If that didn't work, find a suitable address we got from the pool */
+ LIST_FOREACH(addresses, address, link->pool_addresses) {
+ if (address->family != AF_INET)
+ continue;
+
+ return address;
+ }
+
+ return NULL;
+}
+
+static int link_enter_configured(Link *link) {
+ assert(link);
+ assert(link->network);
+ assert(link->state == LINK_STATE_SETTING_ROUTES);
+
+ log_link_info(link, "Configured");
+
+ link_set_state(link, LINK_STATE_CONFIGURED);
+
+ link_dirty(link);
+
+ return 0;
+}
+
+void link_check_ready(Link *link) {
+ Address *a;
+ Iterator i;
+
+ assert(link);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return;
+
+ if (!link->network)
+ return;
+
+ if (!link->static_configured)
+ return;
+
+ if (link_ipv4ll_enabled(link))
+ if (!link->ipv4ll_address ||
+ !link->ipv4ll_route)
+ return;
+
+ if (link_ipv6ll_enabled(link))
+ if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
+ return;
+
+ if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
+ !link->dhcp4_configured) ||
+ (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
+ !link->dhcp6_configured) ||
+ (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
+ !link->dhcp4_configured && !link->dhcp6_configured))
+ return;
+
+ if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
+ return;
+
+ SET_FOREACH(a, link->addresses, i)
+ if (!address_is_ready(a))
+ return;
+
+ if (link->state != LINK_STATE_CONFIGURED)
+ link_enter_configured(link);
+
+ return;
+}
+
+static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(link->link_messages > 0);
+ assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
+ LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
+ LINK_STATE_LINGER));
+
+ link->link_messages--;
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EEXIST)
+ log_link_warning_errno(link, r, "Could not set route: %m");
+
+ if (link->link_messages == 0) {
+ log_link_debug(link, "Routes set");
+ link->static_configured = true;
+ link_check_ready(link);
+ }
+
+ return 1;
+}
+
+static int link_enter_set_routes(Link *link) {
+ Route *rt;
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->state == LINK_STATE_SETTING_ADDRESSES);
+
+ link_set_state(link, LINK_STATE_SETTING_ROUTES);
+
+ LIST_FOREACH(routes, rt, link->network->static_routes) {
+ r = route_configure(rt, link, route_handler);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "Could not set routes: %m");
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->link_messages++;
+ }
+
+ if (link->link_messages == 0) {
+ link->static_configured = true;
+ link_check_ready(link);
+ } else
+ log_link_debug(link, "Setting routes");
+
+ return 0;
+}
+
+int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(m);
+ assert(link);
+ assert(link->ifname);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -ESRCH)
+ log_link_warning_errno(link, r, "Could not drop route: %m");
+
+ return 1;
+}
+
+static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(rtnl);
+ assert(m);
+ assert(link);
+ assert(link->ifname);
+ assert(link->link_messages > 0);
+ assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
+ LINK_STATE_FAILED, LINK_STATE_LINGER));
+
+ link->link_messages--;
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EEXIST)
+ log_link_warning_errno(link, r, "could not set address: %m");
+ else if (r >= 0)
+ manager_rtnl_process_address(rtnl, m, link->manager);
+
+ if (link->link_messages == 0) {
+ log_link_debug(link, "Addresses set");
+ link_enter_set_routes(link);
+ }
+
+ return 1;
+}
+
+static int link_push_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
+ _cleanup_free_ struct in_addr *addresses = NULL;
+ size_t n_addresses = 0, n_allocated = 0;
+ char **a;
+
+ log_debug("Copying DNS server information from %s", link->ifname);
+
+ if (!link->network)
+ return 0;
+
+ STRV_FOREACH(a, link->network->dns) {
+ struct in_addr ia;
+
+ /* Only look for IPv4 addresses */
+ if (inet_pton(AF_INET, *a, &ia) <= 0)
+ continue;
+
+ if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
+ return log_oom();
+
+ addresses[n_addresses++] = ia;
+ }
+
+ if (link->network->dhcp_use_dns &&
+ link->dhcp_lease) {
+ const struct in_addr *da = NULL;
+ int n;
+
+ n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
+ if (n > 0) {
+
+ if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
+ return log_oom();
+
+ memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
+ n_addresses += n;
+ }
+ }
+
+ if (n_addresses <= 0)
+ return 0;
+
+ return sd_dhcp_server_set_dns(s, addresses, n_addresses);
+}
+
+static int link_push_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
+ _cleanup_free_ struct in_addr *addresses = NULL;
+ size_t n_addresses = 0, n_allocated = 0;
+ char **a;
+
+ if (!link->network)
+ return 0;
+
+ log_debug("Copying NTP server information from %s", link->ifname);
+
+ STRV_FOREACH(a, link->network->ntp) {
+ struct in_addr ia;
+
+ /* Only look for IPv4 addresses */
+ if (inet_pton(AF_INET, *a, &ia) <= 0)
+ continue;
+
+ if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
+ return log_oom();
+
+ addresses[n_addresses++] = ia;
+ }
+
+ if (link->network->dhcp_use_ntp &&
+ link->dhcp_lease) {
+ const struct in_addr *da = NULL;
+ int n;
+
+ n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
+ if (n > 0) {
+
+ if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
+ return log_oom();
+
+ memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
+ n_addresses += n;
+ }
+ }
+
+ if (n_addresses <= 0)
+ return 0;
+
+ return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
+}
+
+static int link_enter_set_addresses(Link *link) {
+ Address *ad;
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->state != _LINK_STATE_INVALID);
+
+ link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
+
+ LIST_FOREACH(addresses, ad, link->network->static_addresses) {
+ r = address_configure(ad, link, address_handler, false);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "Could not set addresses: %m");
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->link_messages++;
+ }
+
+ /* now that we can figure out a default address for the dhcp server,
+ start it */
+ if (link_dhcp4_server_enabled(link)) {
+ Address *address;
+ Link *uplink = NULL;
+ bool acquired_uplink = false;
+
+ address = link_find_dhcp_server_address(link);
+ if (!address) {
+ log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
+ link_enter_failed(link);
+ return 0;
+ }
+
+ /* use the server address' subnet as the pool */
+ r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
+ link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
+ if (r < 0)
+ return r;
+
+ /* TODO:
+ r = sd_dhcp_server_set_router(link->dhcp_server,
+ &main_address->in_addr.in);
+ if (r < 0)
+ return r;
+ */
+
+ if (link->network->dhcp_server_max_lease_time_usec > 0) {
+ r = sd_dhcp_server_set_max_lease_time(
+ link->dhcp_server,
+ DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
+ if (r < 0)
+ return r;
+ }
+
+ if (link->network->dhcp_server_default_lease_time_usec > 0) {
+ r = sd_dhcp_server_set_default_lease_time(
+ link->dhcp_server,
+ DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
+ if (r < 0)
+ return r;
+ }
+
+ if (link->network->dhcp_server_emit_dns) {
+
+ if (link->network->n_dhcp_server_dns > 0)
+ r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
+ else {
+ uplink = manager_find_uplink(link->manager, link);
+ acquired_uplink = true;
+
+ if (!uplink) {
+ log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
+ r = 0;
+ } else
+ r = link_push_dns_to_dhcp_server(uplink, link->dhcp_server);
+ }
+ if (r < 0)
+ log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
+ }
+
+
+ if (link->network->dhcp_server_emit_ntp) {
+
+ if (link->network->n_dhcp_server_ntp > 0)
+ r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
+ else {
+ if (!acquired_uplink)
+ uplink = manager_find_uplink(link->manager, link);
+
+ if (!uplink) {
+ log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
+ r = 0;
+ } else
+ r = link_push_ntp_to_dhcp_server(uplink, link->dhcp_server);
+
+ }
+ if (r < 0)
+ log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
+ }
+
+ r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
+ return r;
+ }
+
+ if (link->network->dhcp_server_emit_timezone) {
+ _cleanup_free_ char *buffer = NULL;
+ const char *tz = NULL;
+
+ if (link->network->dhcp_server_timezone)
+ tz = link->network->dhcp_server_timezone;
+ else {
+ r = get_timezone(&buffer);
+ if (r < 0)
+ log_warning_errno(r, "Failed to determine timezone: %m");
+ else
+ tz = buffer;
+ }
+
+ if (tz) {
+ r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
+ if (r < 0)
+ return r;
+ }
+ }
+
+ r = sd_dhcp_server_start(link->dhcp_server);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
+
+ link_enter_failed(link);
+
+ return 0;
+ }
+
+ log_link_debug(link, "Offering DHCPv4 leases");
+ }
+
+ if (link->link_messages == 0)
+ link_enter_set_routes(link);
+ else
+ log_link_debug(link, "Setting addresses");
+
+ return 0;
+}
+
+int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(m);
+ assert(link);
+ assert(link->ifname);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EADDRNOTAVAIL)
+ log_link_warning_errno(link, r, "Could not drop address: %m");
+
+ return 1;
+}
+
+static int link_set_bridge_fdb(Link *const link) {
+ FdbEntry *fdb_entry;
+ int r = 0;
+
+ LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
+ r = fdb_entry_configure(link, fdb_entry);
+ if (r < 0) {
+ log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
+ break;
+ }
+ }
+
+ return r;
+}
+
+static int link_set_proxy_arp(Link *const link) {
+ const char *p = NULL;
+ int r;
+
+ if (!link_proxy_arp_enabled(link))
+ return 0;
+
+ p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
+
+ r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
+
+ return 0;
+}
+
+static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ log_link_debug(link, "Set link");
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EEXIST) {
+ log_link_error_errno(link, r, "Could not join netdev: %m");
+ link_enter_failed(link);
+ return 1;
+ }
+
+ return 0;
+}
+
+static int set_hostname_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
+ _cleanup_link_unref_ Link *link = userdata;
+ const sd_bus_error *e;
+
+ assert(m);
+ assert(link);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ e = sd_bus_message_get_error(m);
+ if (e)
+ log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set hostname: %s", e->message);
+
+ return 1;
+}
+
+int link_set_hostname(Link *link, const char *hostname) {
+ int r;
+
+ assert(link);
+ assert(link->manager);
+
+ log_link_debug(link, "Setting transient hostname: '%s'", strna(hostname));
+
+ if (!link->manager->bus) {
+ /* TODO: replace by assert when we can rely on kdbus */
+ log_link_info(link, "Not connected to system bus, ignoring transient hostname.");
+ return 0;
+ }
+
+ r = sd_bus_call_method_async(
+ link->manager->bus,
+ NULL,
+ "org.freedesktop.hostname1",
+ "/org/freedesktop/hostname1",
+ "org.freedesktop.hostname1",
+ "SetHostname",
+ set_hostname_handler,
+ link,
+ "sb",
+ hostname,
+ false);
+
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not set transient hostname: %m");
+
+ link_ref(link);
+
+ return 0;
+}
+
+static int set_timezone_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
+ _cleanup_link_unref_ Link *link = userdata;
+ const sd_bus_error *e;
+
+ assert(m);
+ assert(link);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ e = sd_bus_message_get_error(m);
+ if (e)
+ log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set timezone: %s", e->message);
+
+ return 1;
+}
+
+int link_set_timezone(Link *link, const char *tz) {
+ int r;
+
+ assert(link);
+ assert(link->manager);
+ assert(tz);
+
+ log_link_debug(link, "Setting system timezone: '%s'", tz);
+
+ if (!link->manager->bus) {
+ log_link_info(link, "Not connected to system bus, ignoring timezone.");
+ return 0;
+ }
+
+ r = sd_bus_call_method_async(
+ link->manager->bus,
+ NULL,
+ "org.freedesktop.timedate1",
+ "/org/freedesktop/timedate1",
+ "org.freedesktop.timedate1",
+ "SetTimezone",
+ set_timezone_handler,
+ link,
+ "sb",
+ tz,
+ false);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not set timezone: %m");
+
+ link_ref(link);
+
+ return 0;
+}
+
+static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(m);
+ assert(link);
+ assert(link->ifname);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Could not set MTU: %m");
+
+ return 1;
+}
+
+int link_set_mtu(Link *link, uint32_t mtu) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
+ int r;
+
+ assert(link);
+ assert(link->manager);
+ assert(link->manager->rtnl);
+
+ log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
+
+ r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
+
+ r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not append MTU: %m");
+
+ r = sd_netlink_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
+
+ link_ref(link);
+
+ return 0;
+}
+
+static int link_set_bridge(Link *link) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
+ int r;
+
+ assert(link);
+ assert(link->network);
+
+ r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
+
+ r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not set message family: %m");
+
+ r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
+
+ r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, !link->network->use_bpdu);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
+
+ r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
+
+ r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
+
+ r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, !link->network->allow_port_to_be_root);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
+
+ r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
+
+ if (link->network->cost != 0) {
+ r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
+ }
+
+ r = sd_netlink_message_close_container(req);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
+
+ r = sd_netlink_call_async(link->manager->rtnl, req, link_set_handler, link, 0, NULL);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
+
+ link_ref(link);
+
+ return r;
+}
+
+static int link_lldp_save(Link *link) {
+ _cleanup_free_ char *temp_path = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ sd_lldp_neighbor **l = NULL;
+ int n = 0, r, i;
+
+ assert(link);
+ assert(link->lldp_file);
+
+ if (!link->lldp) {
+ (void) unlink(link->lldp_file);
+ return 0;
+ }
+
+ r = sd_lldp_get_neighbors(link->lldp, &l);
+ if (r < 0)
+ goto finish;
+ if (r == 0) {
+ (void) unlink(link->lldp_file);
+ goto finish;
+ }
+
+ n = r;
+
+ r = fopen_temporary(link->lldp_file, &f, &temp_path);
+ if (r < 0)
+ goto finish;
+
+ fchmod(fileno(f), 0644);
+
+ for (i = 0; i < n; i++) {
+ const void *p;
+ le64_t u;
+ size_t sz;
+
+ r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
+ if (r < 0)
+ goto finish;
+
+ u = htole64(sz);
+ (void) fwrite(&u, 1, sizeof(u), f);
+ (void) fwrite(p, 1, sz, f);
+ }
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ goto finish;
+
+ if (rename(temp_path, link->lldp_file) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+finish:
+ if (r < 0) {
+ (void) unlink(link->lldp_file);
+ if (temp_path)
+ (void) unlink(temp_path);
+
+ log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
+ }
+
+ if (l) {
+ for (i = 0; i < n; i++)
+ sd_lldp_neighbor_unref(l[i]);
+ free(l);
+ }
+
+ return r;
+}
+
+static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
+ Link *link = userdata;
+ int r;
+
+ assert(link);
+
+ (void) link_lldp_save(link);
+
+ if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
+ /* If we received information about a new neighbor, restart the LLDP "fast" logic */
+
+ log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
+
+ r = link_lldp_emit_start(link);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
+ }
+}
+
+static int link_acquire_ipv6_conf(Link *link) {
+ int r;
+
+ assert(link);
+
+ if (link_dhcp6_enabled(link)) {
+ assert(link->dhcp6_client);
+ assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
+
+ log_link_debug(link, "Acquiring DHCPv6 lease");
+
+ r = sd_dhcp6_client_set_local_address(link->dhcp6_client, &link->ipv6ll_address);
+ if (r < 0 && r != -EBUSY)
+ return log_link_warning_errno(link, r, "Could not set IPv6LL address in DHCP client: %m");
+
+ r = sd_dhcp6_client_start(link->dhcp6_client);
+ if (r < 0 && r != -EBUSY)
+ return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
+ }
+
+ if (link_ipv6_accept_ra_enabled(link)) {
+ assert(link->ndisc_router_discovery);
+
+ log_link_debug(link, "Discovering IPv6 routers");
+
+ r = sd_ndisc_router_discovery_start(link->ndisc_router_discovery);
+ if (r < 0 && r != -EBUSY)
+ return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
+ }
+
+ return 0;
+}
+
+static int link_acquire_ipv4_conf(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->manager);
+ assert(link->manager->event);
+
+ if (link_ipv4ll_enabled(link)) {
+ assert(link->ipv4ll);
+
+ log_link_debug(link, "Acquiring IPv4 link-local address");
+
+ r = sd_ipv4ll_start(link->ipv4ll);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
+ }
+
+ if (link_dhcp4_enabled(link)) {
+ assert(link->dhcp_client);
+
+ log_link_debug(link, "Acquiring DHCPv4 lease");
+
+ r = sd_dhcp_client_start(link->dhcp_client);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
+ }
+
+ return 0;
+}
+
+static int link_acquire_conf(Link *link) {
+ int r;
+
+ assert(link);
+
+ r = link_acquire_ipv4_conf(link);
+ if (r < 0)
+ return r;
+
+ if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
+ r = link_acquire_ipv6_conf(link);
+ if (r < 0)
+ return r;
+ }
+
+ if (link_lldp_emit_enabled(link)) {
+ r = link_lldp_emit_start(link);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
+ }
+
+ return 0;
+}
+
+bool link_has_carrier(Link *link) {
+ /* see Documentation/networking/operstates.txt in the kernel sources */
+
+ if (link->kernel_operstate == IF_OPER_UP)
+ return true;
+
+ if (link->kernel_operstate == IF_OPER_UNKNOWN)
+ /* operstate may not be implemented, so fall back to flags */
+ if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
+ return true;
+
+ return false;
+}
+
+static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(link);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0)
+ /* we warn but don't fail the link, as it may be
+ brought up later */
+ log_link_warning_errno(link, r, "Could not bring up interface: %m");
+
+ return 1;
+}
+
+static int link_up(Link *link) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
+ uint8_t ipv6ll_mode;
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->manager);
+ assert(link->manager->rtnl);
+
+ log_link_debug(link, "Bringing link up");
+
+ r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
+
+ r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not set link flags: %m");
+
+ if (link->network->mac) {
+ r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not set MAC address: %m");
+ }
+
+ /* If IPv6 not configured (no static IPv6 address and neither DHCPv6 nor IPv6LL is enabled)
+ for this interface then disable IPv6 else enable it. */
+ (void) link_enable_ipv6(link);
+
+ if (link->network->mtu) {
+ /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
+ on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
+ if (link_ipv6_enabled(link) && link->network->mtu < IPV6_MIN_MTU) {
+
+ log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
+ "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
+
+ link->network->mtu = IPV6_MIN_MTU;
+ }
+
+ r = sd_netlink_message_append_u32(req, IFLA_MTU, link->network->mtu);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not set MTU: %m");
+ }
+
+ r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
+
+ if (link_ipv6_enabled(link)) {
+ /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
+ r = sd_netlink_message_open_container(req, AF_INET6);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
+
+ ipv6ll_mode = link_ipv6ll_enabled(link) ? IN6_ADDR_GEN_MODE_EUI64 : IN6_ADDR_GEN_MODE_NONE;
+ r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
+
+ if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
+ r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
+ }
+
+ r = sd_netlink_message_close_container(req);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
+ }
+
+ r = sd_netlink_message_close_container(req);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
+
+ r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
+
+ link_ref(link);
+
+ return 0;
+}
+
+static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(link);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Could not bring down interface: %m");
+
+ return 1;
+}
+
+static int link_down(Link *link) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
+ int r;
+
+ assert(link);
+ assert(link->manager);
+ assert(link->manager->rtnl);
+
+ log_link_debug(link, "Bringing link down");
+
+ r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
+ RTM_SETLINK, link->ifindex);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
+
+ r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not set link flags: %m");
+
+ r = sd_netlink_call_async(link->manager->rtnl, req, link_down_handler, link, 0, NULL);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
+
+ link_ref(link);
+
+ return 0;
+}
+
+static int link_handle_bound_to_list(Link *link) {
+ Link *l;
+ Iterator i;
+ int r;
+ bool required_up = false;
+ bool link_is_up = false;
+
+ assert(link);
+
+ if (hashmap_isempty(link->bound_to_links))
+ return 0;
+
+ if (link->flags & IFF_UP)
+ link_is_up = true;
+
+ HASHMAP_FOREACH (l, link->bound_to_links, i)
+ if (link_has_carrier(l)) {
+ required_up = true;
+ break;
+ }
+
+ if (!required_up && link_is_up) {
+ r = link_down(link);
+ if (r < 0)
+ return r;
+ } else if (required_up && !link_is_up) {
+ r = link_up(link);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int link_handle_bound_by_list(Link *link) {
+ Iterator i;
+ Link *l;
+ int r;
+
+ assert(link);
+
+ if (hashmap_isempty(link->bound_by_links))
+ return 0;
+
+ HASHMAP_FOREACH (l, link->bound_by_links, i) {
+ r = link_handle_bound_to_list(l);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
+ int r;
+
+ assert(link);
+ assert(carrier);
+
+ if (link == carrier)
+ return 0;
+
+ if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
+ return 0;
+
+ r = hashmap_ensure_allocated(h, NULL);
+ if (r < 0)
+ return r;
+
+ r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static int link_new_bound_by_list(Link *link) {
+ Manager *m;
+ Link *carrier;
+ Iterator i;
+ int r;
+ bool list_updated = false;
+
+ assert(link);
+ assert(link->manager);
+
+ m = link->manager;
+
+ HASHMAP_FOREACH(carrier, m->links, i) {
+ if (!carrier->network)
+ continue;
+
+ if (strv_isempty(carrier->network->bind_carrier))
+ continue;
+
+ if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
+ r = link_put_carrier(link, carrier, &link->bound_by_links);
+ if (r < 0)
+ return r;
+
+ list_updated = true;
+ }
+ }
+
+ if (list_updated)
+ link_dirty(link);
+
+ HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
+ r = link_put_carrier(carrier, link, &carrier->bound_to_links);
+ if (r < 0)
+ return r;
+
+ link_dirty(carrier);
+ }
+
+ return 0;
+}
+
+static int link_new_bound_to_list(Link *link) {
+ Manager *m;
+ Link *carrier;
+ Iterator i;
+ int r;
+ bool list_updated = false;
+
+ assert(link);
+ assert(link->manager);
+
+ if (!link->network)
+ return 0;
+
+ if (strv_isempty(link->network->bind_carrier))
+ return 0;
+
+ m = link->manager;
+
+ HASHMAP_FOREACH (carrier, m->links, i) {
+ if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
+ r = link_put_carrier(link, carrier, &link->bound_to_links);
+ if (r < 0)
+ return r;
+
+ list_updated = true;
+ }
+ }
+
+ if (list_updated)
+ link_dirty(link);
+
+ HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
+ r = link_put_carrier(carrier, link, &carrier->bound_by_links);
+ if (r < 0)
+ return r;
+
+ link_dirty(carrier);
+ }
+
+ return 0;
+}
+
+static int link_new_carrier_maps(Link *link) {
+ int r;
+
+ r = link_new_bound_by_list(link);
+ if (r < 0)
+ return r;
+
+ r = link_handle_bound_by_list(link);
+ if (r < 0)
+ return r;
+
+ r = link_new_bound_to_list(link);
+ if (r < 0)
+ return r;
+
+ r = link_handle_bound_to_list(link);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static void link_free_bound_to_list(Link *link) {
+ Link *bound_to;
+ Iterator i;
+
+ HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
+ hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
+
+ if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
+ link_dirty(bound_to);
+ }
+
+ return;
+}
+
+static void link_free_bound_by_list(Link *link) {
+ Link *bound_by;
+ Iterator i;
+
+ HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
+ hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
+
+ if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
+ link_dirty(bound_by);
+ link_handle_bound_to_list(bound_by);
+ }
+ }
+
+ return;
+}
+
+static void link_free_carrier_maps(Link *link) {
+ bool list_updated = false;
+
+ assert(link);
+
+ if (!hashmap_isempty(link->bound_to_links)) {
+ link_free_bound_to_list(link);
+ list_updated = true;
+ }
+
+ if (!hashmap_isempty(link->bound_by_links)) {
+ link_free_bound_by_list(link);
+ list_updated = true;
+ }
+
+ if (list_updated)
+ link_dirty(link);
+
+ return;
+}
+
+void link_drop(Link *link) {
+ if (!link || link->state == LINK_STATE_LINGER)
+ return;
+
+ link_set_state(link, LINK_STATE_LINGER);
+
+ link_free_carrier_maps(link);
+
+ log_link_debug(link, "Link removed");
+
+ (void)unlink(link->state_file);
+ link_unref(link);
+
+ return;
+}
+
+static int link_joined(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+
+ if (!hashmap_isempty(link->bound_to_links)) {
+ r = link_handle_bound_to_list(link);
+ if (r < 0)
+ return r;
+ } else if (!(link->flags & IFF_UP)) {
+ r = link_up(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return r;
+ }
+ }
+
+ if (link->network->bridge) {
+ r = link_set_bridge(link);
+ if (r < 0)
+ log_link_error_errno(link, r, "Could not set bridge message: %m");
+ }
+
+ return link_enter_set_addresses(link);
+}
+
+static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(link);
+ assert(link->network);
+
+ link->enslaving--;
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EEXIST) {
+ log_link_error_errno(link, r, "Could not join netdev: %m");
+ link_enter_failed(link);
+ return 1;
+ } else
+ log_link_debug(link, "Joined netdev");
+
+ if (link->enslaving <= 0)
+ link_joined(link);
+
+ return 1;
+}
+
+static int link_enter_join_netdev(Link *link) {
+ NetDev *netdev;
+ Iterator i;
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->state == LINK_STATE_PENDING);
+
+ link_set_state(link, LINK_STATE_ENSLAVING);
+
+ link_dirty(link);
+
+ if (!link->network->bridge &&
+ !link->network->bond &&
+ hashmap_isempty(link->network->stacked_netdevs))
+ return link_joined(link);
+
+ if (link->network->bond) {
+ log_struct(LOG_DEBUG,
+ LOG_LINK_INTERFACE(link),
+ LOG_NETDEV_INTERFACE(link->network->bond),
+ LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname),
+ NULL);
+
+ r = netdev_join(link->network->bond, link, netdev_join_handler);
+ if (r < 0) {
+ log_struct_errno(LOG_WARNING, r,
+ LOG_LINK_INTERFACE(link),
+ LOG_NETDEV_INTERFACE(link->network->bond),
+ LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname),
+ NULL);
+
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->enslaving++;
+ }
+
+ if (link->network->bridge) {
+ log_struct(LOG_DEBUG,
+ LOG_LINK_INTERFACE(link),
+ LOG_NETDEV_INTERFACE(link->network->bridge),
+ LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname),
+ NULL);
+
+ r = netdev_join(link->network->bridge, link, netdev_join_handler);
+ if (r < 0) {
+ log_struct_errno(LOG_WARNING, r,
+ LOG_LINK_INTERFACE(link),
+ LOG_NETDEV_INTERFACE(link->network->bridge),
+ LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname),
+ NULL),
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->enslaving++;
+ }
+
+ HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
+
+ log_struct(LOG_DEBUG,
+ LOG_LINK_INTERFACE(link),
+ LOG_NETDEV_INTERFACE(netdev),
+ LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname),
+ NULL);
+
+ r = netdev_join(netdev, link, netdev_join_handler);
+ if (r < 0) {
+ log_struct_errno(LOG_WARNING, r,
+ LOG_LINK_INTERFACE(link),
+ LOG_NETDEV_INTERFACE(netdev),
+ LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname),
+ NULL);
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->enslaving++;
+ }
+
+ return 0;
+}
+
+static int link_set_ipv4_forward(Link *link) {
+ int r;
+
+ if (!link_ipv4_forward_enabled(link))
+ return 0;
+
+ /* We propagate the forwarding flag from one interface to the
+ * global setting one way. This means: as long as at least one
+ * interface was configured at any time that had IP forwarding
+ * enabled the setting will stay on for good. We do this
+ * primarily to keep IPv4 and IPv6 packet forwarding behaviour
+ * somewhat in sync (see below). */
+
+ r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
+
+ return 0;
+}
+
+static int link_set_ipv6_forward(Link *link) {
+ int r;
+
+ if (!link_ipv6_forward_enabled(link))
+ return 0;
+
+ /* On Linux, the IPv6 stack does not not know a per-interface
+ * packet forwarding setting: either packet forwarding is on
+ * for all, or off for all. We hence don't bother with a
+ * per-interface setting, but simply propagate the interface
+ * flag, if it is set, to the global flag, one-way. Note that
+ * while IPv4 would allow a per-interface flag, we expose the
+ * same behaviour there and also propagate the setting from
+ * one to all, to keep things simple (see above). */
+
+ r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
+
+ return 0;
+}
+
+static int link_set_ipv6_privacy_extensions(Link *link) {
+ char buf[DECIMAL_STR_MAX(unsigned) + 1];
+ IPv6PrivacyExtensions s;
+ const char *p = NULL;
+ int r;
+
+ s = link_ipv6_privacy_extensions(link);
+ if (s < 0)
+ return 0;
+
+ p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
+ xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
+
+ r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
+
+ return 0;
+}
+
+static int link_set_ipv6_accept_ra(Link *link) {
+ const char *p = NULL;
+ int r;
+
+ /* Make this a NOP if IPv6 is not available */
+ if (!socket_ipv6_is_supported())
+ return 0;
+
+ if (link->flags & IFF_LOOPBACK)
+ return 0;
+
+ if (!link->network)
+ return 0;
+
+ p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
+
+ /* We handle router advertisments ourselves, tell the kernel to GTFO */
+ r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
+
+ return 0;
+}
+
+static int link_set_ipv6_dad_transmits(Link *link) {
+ char buf[DECIMAL_STR_MAX(int) + 1];
+ const char *p = NULL;
+ int r;
+
+ /* Make this a NOP if IPv6 is not available */
+ if (!socket_ipv6_is_supported())
+ return 0;
+
+ if (link->flags & IFF_LOOPBACK)
+ return 0;
+
+ if (!link->network)
+ return 0;
+
+ if (link->network->ipv6_dad_transmits < 0)
+ return 0;
+
+ p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
+ xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
+
+ r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
+
+ return 0;
+}
+
+static int link_set_ipv6_hop_limit(Link *link) {
+ char buf[DECIMAL_STR_MAX(int) + 1];
+ const char *p = NULL;
+ int r;
+
+ /* Make this a NOP if IPv6 is not available */
+ if (!socket_ipv6_is_supported())
+ return 0;
+
+ if (link->flags & IFF_LOOPBACK)
+ return 0;
+
+ if (!link->network)
+ return 0;
+
+ if (link->network->ipv6_hop_limit < 0)
+ return 0;
+
+ p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
+ xsprintf(buf, "%i", link->network->ipv6_hop_limit);
+
+ r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
+
+ return 0;
+}
+
+static int link_drop_foreign_config(Link *link) {
+ Address *address;
+ Route *route;
+ Iterator i;
+ int r;
+
+ SET_FOREACH(address, link->addresses_foreign, i) {
+ /* we consider IPv6LL addresses to be managed by the kernel */
+ if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
+ continue;
+
+ r = address_remove(address, link, link_address_remove_handler);
+ if (r < 0)
+ return r;
+ }
+
+ SET_FOREACH(route, link->routes_foreign, i) {
+ /* do not touch routes managed by the kernel */
+ if (route->protocol == RTPROT_KERNEL)
+ continue;
+
+ r = route_remove(route, link, link_address_remove_handler);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int link_update_lldp(Link *link) {
+ int r;
+
+ assert(link);
+
+ if (!link->lldp)
+ return 0;
+
+ if (link->flags & IFF_UP) {
+ r = sd_lldp_start(link->lldp);
+ if (r > 0)
+ log_link_debug(link, "Started LLDP.");
+ } else {
+ r = sd_lldp_stop(link->lldp);
+ if (r > 0)
+ log_link_debug(link, "Stopped LLDP.");
+ }
+
+ return r;
+}
+
+static int link_configure(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->state == LINK_STATE_PENDING);
+
+ /* Drop foreign config, but ignore loopback or critical devices.
+ * We do not want to remove loopback address or addresses used for root NFS. */
+ if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
+ r = link_drop_foreign_config(link);
+ if (r < 0)
+ return r;
+ }
+
+ r = link_set_bridge_fdb(link);
+ if (r < 0)
+ return r;
+
+ r = link_set_proxy_arp(link);
+ if (r < 0)
+ return r;
+
+ r = link_set_ipv4_forward(link);
+ if (r < 0)
+ return r;
+
+ r = link_set_ipv6_forward(link);
+ if (r < 0)
+ return r;
+
+ r = link_set_ipv6_privacy_extensions(link);
+ if (r < 0)
+ return r;
+
+ r = link_set_ipv6_accept_ra(link);
+ if (r < 0)
+ return r;
+
+ r = link_set_ipv6_dad_transmits(link);
+ if (r < 0)
+ return r;
+
+ r = link_set_ipv6_hop_limit(link);
+ if (r < 0)
+ return r;
+
+ if (link_ipv4ll_enabled(link)) {
+ r = ipv4ll_configure(link);
+ if (r < 0)
+ return r;
+ }
+
+ if (link_dhcp4_enabled(link)) {
+ r = dhcp4_configure(link);
+ if (r < 0)
+ return r;
+ }
+
+ if (link_dhcp4_server_enabled(link)) {
+ r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
+ if (r < 0)
+ return r;
+ }
+
+ if (link_dhcp6_enabled(link) ||
+ link_ipv6_accept_ra_enabled(link)) {
+ r = dhcp6_configure(link);
+ if (r < 0)
+ return r;
+ }
+
+ if (link_ipv6_accept_ra_enabled(link)) {
+ r = ndisc_configure(link);
+ if (r < 0)
+ return r;
+ }
+
+ if (link_lldp_rx_enabled(link)) {
+ r = sd_lldp_new(&link->lldp, link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_lldp_match_capabilities(link->lldp,
+ link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
+ SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
+ SD_LLDP_SYSTEM_CAPABILITIES_ALL);
+ if (r < 0)
+ return r;
+
+ r = sd_lldp_set_filter_address(link->lldp, &link->mac);
+ if (r < 0)
+ return r;
+
+ r = sd_lldp_attach_event(link->lldp, NULL, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
+ if (r < 0)
+ return r;
+
+ r = link_update_lldp(link);
+ if (r < 0)
+ return r;
+ }
+
+ if (link_has_carrier(link)) {
+ r = link_acquire_conf(link);
+ if (r < 0)
+ return r;
+ }
+
+ return link_enter_join_netdev(link);
+}
+
+static int link_initialized_and_synced(sd_netlink *rtnl, sd_netlink_message *m,
+ void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ Network *network;
+ int r;
+
+ assert(link);
+ assert(link->ifname);
+ assert(link->manager);
+
+ if (link->state != LINK_STATE_PENDING)
+ return 1;
+
+ log_link_debug(link, "Link state is up-to-date");
+
+ r = link_new_bound_by_list(link);
+ if (r < 0)
+ return r;
+
+ r = link_handle_bound_by_list(link);
+ if (r < 0)
+ return r;
+
+ if (!link->network) {
+ r = network_get(link->manager, link->udev_device, link->ifname,
+ &link->mac, &network);
+ if (r == -ENOENT) {
+ link_enter_unmanaged(link);
+ return 1;
+ } else if (r < 0)
+ return r;
+
+ if (link->flags & IFF_LOOPBACK) {
+ if (network->link_local != ADDRESS_FAMILY_NO)
+ log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
+
+ if (network->dhcp != ADDRESS_FAMILY_NO)
+ log_link_debug(link, "Ignoring DHCP clients for loopback link");
+
+ if (network->dhcp_server)
+ log_link_debug(link, "Ignoring DHCP server for loopback link");
+ }
+
+ r = network_apply(link->manager, network, link);
+ if (r < 0)
+ return r;
+ }
+
+ r = link_new_bound_to_list(link);
+ if (r < 0)
+ return r;
+
+ r = link_configure(link);
+ if (r < 0)
+ return r;
+
+ return 1;
+}
+
+int link_initialized(Link *link, struct udev_device *device) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
+ int r;
+
+ assert(link);
+ assert(link->manager);
+ assert(link->manager->rtnl);
+ assert(device);
+
+ if (link->state != LINK_STATE_PENDING)
+ return 0;
+
+ if (link->udev_device)
+ return 0;
+
+ log_link_debug(link, "udev initialized link");
+
+ link->udev_device = udev_device_ref(device);
+
+ /* udev has initialized the link, but we don't know if we have yet
+ * processed the NEWLINK messages with the latest state. Do a GETLINK,
+ * when it returns we know that the pending NEWLINKs have already been
+ * processed and that we are up-to-date */
+
+ r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
+ link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_call_async(link->manager->rtnl, req,
+ link_initialized_and_synced, link, 0, NULL);
+ if (r < 0)
+ return r;
+
+ link_ref(link);
+
+ return 0;
+}
+
+static int link_load(Link *link) {
+ _cleanup_free_ char *network_file = NULL,
+ *addresses = NULL,
+ *routes = NULL,
+ *dhcp4_address = NULL,
+ *ipv4ll_address = NULL;
+ union in_addr_union address;
+ union in_addr_union route_dst;
+ const char *p;
+ int r;
+
+ assert(link);
+
+ r = parse_env_file(link->state_file, NEWLINE,
+ "NETWORK_FILE", &network_file,
+ "ADDRESSES", &addresses,
+ "ROUTES", &routes,
+ "DHCP4_ADDRESS", &dhcp4_address,
+ "IPV4LL_ADDRESS", &ipv4ll_address,
+ NULL);
+ if (r < 0 && r != -ENOENT)
+ return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
+
+ if (network_file) {
+ Network *network;
+ char *suffix;
+
+ /* drop suffix */
+ suffix = strrchr(network_file, '.');
+ if (!suffix) {
+ log_link_debug(link, "Failed to get network name from %s", network_file);
+ goto network_file_fail;
+ }
+ *suffix = '\0';
+
+ r = network_get_by_name(link->manager, basename(network_file), &network);
+ if (r < 0) {
+ log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
+ goto network_file_fail;
+ }
+
+ r = network_apply(link->manager, network, link);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
+ }
+
+network_file_fail:
+
+ if (addresses) {
+ p = addresses;
+
+ for (;;) {
+ _cleanup_free_ char *address_str = NULL;
+ char *prefixlen_str;
+ int family;
+ unsigned char prefixlen;
+
+ r = extract_first_word(&p, &address_str, NULL, 0);
+ if (r < 0) {
+ log_link_debug_errno(link, r, "Failed to extract next address string: %m");
+ continue;
+ }
+ if (r == 0)
+ break;
+
+ prefixlen_str = strchr(address_str, '/');
+ if (!prefixlen_str) {
+ log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
+ continue;
+ }
+
+ *prefixlen_str++ = '\0';
+
+ r = sscanf(prefixlen_str, "%hhu", &prefixlen);
+ if (r != 1) {
+ log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
+ continue;
+ }
+
+ r = in_addr_from_string_auto(address_str, &family, &address);
+ if (r < 0) {
+ log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
+ continue;
+ }
+
+ r = address_add(link, family, &address, prefixlen, NULL);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Failed to add address: %m");
+ }
+ }
+
+ if (routes) {
+ p = routes;
+
+ for (;;) {
+ Route *route;
+ _cleanup_free_ char *route_str = NULL;
+ _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
+ usec_t lifetime;
+ char *prefixlen_str;
+ int family;
+ unsigned char prefixlen, tos, table;
+ uint32_t priority;
+
+ r = extract_first_word(&p, &route_str, NULL, 0);
+ if (r < 0) {
+ log_link_debug_errno(link, r, "Failed to extract next route string: %m");
+ continue;
+ }
+ if (r == 0)
+ break;
+
+ prefixlen_str = strchr(route_str, '/');
+ if (!prefixlen_str) {
+ log_link_debug(link, "Failed to parse route %s", route_str);
+ continue;
+ }
+
+ *prefixlen_str++ = '\0';
+
+ r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
+ if (r != 5) {
+ log_link_debug(link,
+ "Failed to parse destination prefix length, tos, priority, table or expiration %s",
+ prefixlen_str);
+ continue;
+ }
+
+ r = in_addr_from_string_auto(route_str, &family, &route_dst);
+ if (r < 0) {
+ log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
+ continue;
+ }
+
+ r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Failed to add route: %m");
+
+ if (lifetime != USEC_INFINITY) {
+ r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
+ 0, route_expire_handler, route);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
+ }
+
+ route->lifetime = lifetime;
+ sd_event_source_unref(route->expire);
+ route->expire = expire;
+ expire = NULL;
+ }
+ }
+
+ if (dhcp4_address) {
+ r = in_addr_from_string(AF_INET, dhcp4_address, &address);
+ if (r < 0) {
+ log_link_debug_errno(link, r, "Falied to parse DHCPv4 address %s: %m", dhcp4_address);
+ goto dhcp4_address_fail;
+ }
+
+ r = sd_dhcp_client_new(&link->dhcp_client);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Falied to create DHCPv4 client: %m");
+
+ r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Falied to set inital DHCPv4 address %s: %m", dhcp4_address);
+ }
+
+dhcp4_address_fail:
+
+ if (ipv4ll_address) {
+ r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
+ if (r < 0) {
+ log_link_debug_errno(link, r, "Falied to parse IPv4LL address %s: %m", ipv4ll_address);
+ goto ipv4ll_address_fail;
+ }
+
+ r = sd_ipv4ll_new(&link->ipv4ll);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Falied to create IPv4LL client: %m");
+
+ r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Falied to set inital IPv4LL address %s: %m", ipv4ll_address);
+ }
+
+ipv4ll_address_fail:
+
+ return 0;
+}
+
+int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
+ Link *link;
+ _cleanup_udev_device_unref_ struct udev_device *device = NULL;
+ char ifindex_str[2 + DECIMAL_STR_MAX(int)];
+ int r;
+
+ assert(m);
+ assert(m->rtnl);
+ assert(message);
+ assert(ret);
+
+ r = link_new(m, message, ret);
+ if (r < 0)
+ return r;
+
+ link = *ret;
+
+ log_link_debug(link, "Link %d added", link->ifindex);
+
+ r = link_load(link);
+ if (r < 0)
+ return r;
+
+ if (detect_container() <= 0) {
+ /* not in a container, udev will be around */
+ sprintf(ifindex_str, "n%d", link->ifindex);
+ device = udev_device_new_from_device_id(m->udev, ifindex_str);
+ if (!device) {
+ r = log_link_warning_errno(link, errno, "Could not find udev device: %m");
+ goto failed;
+ }
+
+ if (udev_device_get_is_initialized(device) <= 0) {
+ /* not yet ready */
+ log_link_debug(link, "link pending udev initialization...");
+ return 0;
+ }
+
+ r = link_initialized(link, device);
+ if (r < 0)
+ goto failed;
+ } else {
+ /* we are calling a callback directly, so must take a ref */
+ link_ref(link);
+
+ r = link_initialized_and_synced(m->rtnl, NULL, link);
+ if (r < 0)
+ goto failed;
+ }
+
+ return 0;
+failed:
+ link_enter_failed(link);
+ return r;
+}
+
+int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
+ int r;
+
+ assert(link);
+
+ log_link_info(link, "Gained IPv6LL");
+
+ link->ipv6ll_address = *address;
+ link_check_ready(link);
+
+ if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
+ r = link_acquire_ipv6_conf(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return r;
+ }
+ }
+
+ return 0;
+}
+
+static int link_carrier_gained(Link *link) {
+ int r;
+
+ assert(link);
+
+ if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
+ r = link_acquire_conf(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return r;
+ }
+
+ r = link_enter_set_addresses(link);
+ if (r < 0)
+ return r;
+ }
+
+ r = link_handle_bound_by_list(link);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static int link_carrier_lost(Link *link) {
+ int r;
+
+ assert(link);
+
+ r = link_stop_clients(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return r;
+ }
+
+ r = link_handle_bound_by_list(link);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int link_carrier_reset(Link *link) {
+ int r;
+
+ assert(link);
+
+ if (link_has_carrier(link)) {
+ r = link_carrier_lost(link);
+ if (r < 0)
+ return r;
+
+ r = link_carrier_gained(link);
+ if (r < 0)
+ return r;
+
+ log_link_info(link, "Reset carrier");
+ }
+
+ return 0;
+}
+
+int link_update(Link *link, sd_netlink_message *m) {
+ struct ether_addr mac;
+ const char *ifname;
+ uint32_t mtu;
+ bool had_carrier, carrier_gained, carrier_lost;
+ int r;
+
+ assert(link);
+ assert(link->ifname);
+ assert(m);
+
+ if (link->state == LINK_STATE_LINGER) {
+ link_ref(link);
+ log_link_info(link, "Link readded");
+ link_set_state(link, LINK_STATE_ENSLAVING);
+
+ r = link_new_carrier_maps(link);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
+ if (r >= 0 && !streq(ifname, link->ifname)) {
+ log_link_info(link, "Renamed to %s", ifname);
+
+ link_free_carrier_maps(link);
+
+ r = free_and_strdup(&link->ifname, ifname);
+ if (r < 0)
+ return r;
+
+ r = link_new_carrier_maps(link);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
+ if (r >= 0 && mtu > 0) {
+ link->mtu = mtu;
+ if (!link->original_mtu) {
+ link->original_mtu = mtu;
+ log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
+ }
+
+ if (link->dhcp_client) {
+ r = sd_dhcp_client_set_mtu(link->dhcp_client,
+ link->mtu);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
+ return r;
+ }
+ }
+ }
+
+ /* The kernel may broadcast NEWLINK messages without the MAC address
+ set, simply ignore them. */
+ r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
+ if (r >= 0) {
+ if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
+ ETH_ALEN)) {
+
+ memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
+ ETH_ALEN);
+
+ log_link_debug(link, "MAC address: "
+ "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
+ mac.ether_addr_octet[0],
+ mac.ether_addr_octet[1],
+ mac.ether_addr_octet[2],
+ mac.ether_addr_octet[3],
+ mac.ether_addr_octet[4],
+ mac.ether_addr_octet[5]);
+
+ if (link->ipv4ll) {
+ r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
+ }
+
+ if (link->dhcp_client) {
+ const DUID *duid = link_duid(link);
+
+ r = sd_dhcp_client_set_mac(link->dhcp_client,
+ (const uint8_t *) &link->mac,
+ sizeof (link->mac),
+ ARPHRD_ETHER);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
+
+ r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
+ link->network->iaid,
+ duid->type,
+ duid->raw_data_len > 0 ? duid->raw_data : NULL,
+ duid->raw_data_len);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Could not update DUID/IAID in DHCP client: %m");
+ }
+
+ if (link->dhcp6_client) {
+ const DUID* duid = link_duid(link);
+
+ r = sd_dhcp6_client_set_mac(link->dhcp6_client,
+ (const uint8_t *) &link->mac,
+ sizeof (link->mac),
+ ARPHRD_ETHER);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
+
+ r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
+ link->network->iaid);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
+
+ r = sd_dhcp6_client_set_duid(link->dhcp6_client,
+ duid->type,
+ duid->raw_data_len > 0 ? duid->raw_data : NULL,
+ duid->raw_data_len);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
+ }
+ }
+ }
+
+ had_carrier = link_has_carrier(link);
+
+ r = link_update_flags(link, m);
+ if (r < 0)
+ return r;
+
+ r = link_update_lldp(link);
+ if (r < 0)
+ return r;
+
+ carrier_gained = !had_carrier && link_has_carrier(link);
+ carrier_lost = had_carrier && !link_has_carrier(link);
+
+ if (carrier_gained) {
+ log_link_info(link, "Gained carrier");
+
+ r = link_carrier_gained(link);
+ if (r < 0)
+ return r;
+ } else if (carrier_lost) {
+ log_link_info(link, "Lost carrier");
+
+ r = link_carrier_lost(link);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
+ bool space = false;
+ Iterator i;
+ Link *link;
+
+ assert(f);
+ assert(prefix);
+
+ if (hashmap_isempty(h))
+ return;
+
+ fputs(prefix, f);
+ HASHMAP_FOREACH(link, h, i) {
+ if (space)
+ fputc(' ', f);
+
+ fprintf(f, "%i", link->ifindex);
+ space = true;
+ }
+
+ fputc('\n', f);
+}
+
+int link_save(Link *link) {
+ _cleanup_free_ char *temp_path = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ const char *admin_state, *oper_state;
+ Address *a;
+ Route *route;
+ Iterator i;
+ int r;
+
+ assert(link);
+ assert(link->state_file);
+ assert(link->lease_file);
+ assert(link->manager);
+
+ if (link->state == LINK_STATE_LINGER) {
+ unlink(link->state_file);
+ return 0;
+ }
+
+ link_lldp_save(link);
+
+ admin_state = link_state_to_string(link->state);
+ assert(admin_state);
+
+ oper_state = link_operstate_to_string(link->operstate);
+ assert(oper_state);
+
+ r = fopen_temporary(link->state_file, &f, &temp_path);
+ if (r < 0)
+ goto fail;
+
+ fchmod(fileno(f), 0644);
+
+ fprintf(f,
+ "# This is private data. Do not parse.\n"
+ "ADMIN_STATE=%s\n"
+ "OPER_STATE=%s\n",
+ admin_state, oper_state);
+
+ if (link->network) {
+ bool space;
+ sd_dhcp6_lease *dhcp6_lease = NULL;
+ const char *dhcp_domainname = NULL;
+ char **dhcp6_domains = NULL;
+
+ if (link->dhcp6_client) {
+ r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
+ if (r < 0 && r != -ENOMSG)
+ log_link_debug(link, "No DHCPv6 lease");
+ }
+
+ fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
+
+ fputs("DNS=", f);
+ space = false;
+ fputstrv(f, link->network->dns, NULL, &space);
+
+ if (link->network->dhcp_use_dns &&
+ link->dhcp_lease) {
+ const struct in_addr *addresses;
+
+ r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
+ if (r > 0) {
+ if (space)
+ fputc(' ', f);
+ serialize_in_addrs(f, addresses, r);
+ space = true;
+ }
+ }
+
+ if (link->network->dhcp_use_dns && dhcp6_lease) {
+ struct in6_addr *in6_addrs;
+
+ r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
+ if (r > 0) {
+ if (space)
+ fputc(' ', f);
+ serialize_in6_addrs(f, in6_addrs, r);
+ }
+ }
+
+ fputc('\n', f);
+
+ fputs("NTP=", f);
+ space = false;
+ fputstrv(f, link->network->ntp, NULL, &space);
+
+ if (link->network->dhcp_use_ntp &&
+ link->dhcp_lease) {
+ const struct in_addr *addresses;
+
+ r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
+ if (r > 0) {
+ if (space)
+ fputc(' ', f);
+ serialize_in_addrs(f, addresses, r);
+ space = true;
+ }
+ }
+
+ if (link->network->dhcp_use_ntp && dhcp6_lease) {
+ struct in6_addr *in6_addrs;
+ char **hosts;
+
+ r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
+ &in6_addrs);
+ if (r > 0) {
+ if (space)
+ fputc(' ', f);
+ serialize_in6_addrs(f, in6_addrs, r);
+ space = true;
+ }
+
+ r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
+ if (r > 0)
+ fputstrv(f, hosts, NULL, &space);
+ }
+
+ fputc('\n', f);
+
+ if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
+ if (link->dhcp_lease)
+ (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
+
+ if (dhcp6_lease)
+ (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
+ }
+
+ fputs("DOMAINS=", f);
+ fputstrv(f, link->network->search_domains, NULL, &space);
+
+ if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES && dhcp_domainname)
+ fputs_with_space(f, dhcp_domainname, NULL, &space);
+
+ if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES && dhcp6_domains)
+ fputstrv(f, dhcp6_domains, NULL, &space);
+
+ fputc('\n', f);
+
+ fputs("ROUTE_DOMAINS=", f);
+ fputstrv(f, link->network->route_domains, NULL, NULL);
+
+ if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE && dhcp_domainname)
+ fputs_with_space(f, dhcp_domainname, NULL, &space);
+
+ if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE && dhcp6_domains)
+ fputstrv(f, dhcp6_domains, NULL, &space);
+
+ fputc('\n', f);
+
+ fprintf(f, "LLMNR=%s\n",
+ resolve_support_to_string(link->network->llmnr));
+ fprintf(f, "MDNS=%s\n",
+ resolve_support_to_string(link->network->mdns));
+
+ if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
+ fprintf(f, "DNSSEC=%s\n",
+ dnssec_mode_to_string(link->network->dnssec_mode));
+
+ if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
+ const char *n;
+
+ fputs("DNSSEC_NTA=", f);
+ space = false;
+ SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
+ fputs_with_space(f, n, NULL, &space);
+ fputc('\n', f);
+ }
+
+ fputs("ADDRESSES=", f);
+ space = false;
+ SET_FOREACH(a, link->addresses, i) {
+ _cleanup_free_ char *address_str = NULL;
+
+ r = in_addr_to_string(a->family, &a->in_addr, &address_str);
+ if (r < 0)
+ goto fail;
+
+ fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
+ space = true;
+ }
+ fputc('\n', f);
+
+ fputs("ROUTES=", f);
+ space = false;
+ SET_FOREACH(route, link->routes, i) {
+ _cleanup_free_ char *route_str = NULL;
+
+ r = in_addr_to_string(route->family, &route->dst, &route_str);
+ if (r < 0)
+ goto fail;
+
+ fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%hhu/"USEC_FMT, space ? " " : "", route_str,
+ route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
+ space = true;
+ }
+
+ fputc('\n', f);
+ }
+
+ print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
+ print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
+
+ if (link->dhcp_lease) {
+ struct in_addr address;
+ const char *tz = NULL;
+
+ assert(link->network);
+
+ r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
+ if (r >= 0)
+ fprintf(f, "TIMEZONE=%s\n", tz);
+
+ r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
+ if (r >= 0) {
+ fputs("DHCP4_ADDRESS=", f);
+ serialize_in_addrs(f, &address, 1);
+ fputc('\n', f);
+ }
+
+ r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
+ if (r < 0)
+ goto fail;
+
+ fprintf(f,
+ "DHCP_LEASE=%s\n",
+ link->lease_file);
+ } else
+ unlink(link->lease_file);
+
+ if (link->ipv4ll) {
+ struct in_addr address;
+
+ r = sd_ipv4ll_get_address(link->ipv4ll, &address);
+ if (r >= 0) {
+ fputs("IPV4LL_ADDRESS=", f);
+ serialize_in_addrs(f, &address, 1);
+ fputc('\n', f);
+ }
+ }
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ goto fail;
+
+ if (rename(temp_path, link->state_file) < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ (void) unlink(link->state_file);
+ if (temp_path)
+ (void) unlink(temp_path);
+
+ return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
+}
+
+/* The serialized state in /run is no longer up-to-date. */
+void link_dirty(Link *link) {
+ int r;
+
+ assert(link);
+
+ /* mark manager dirty as link is dirty */
+ manager_dirty(link->manager);
+
+ r = set_ensure_allocated(&link->manager->dirty_links, NULL);
+ if (r < 0)
+ /* allocation errors are ignored */
+ return;
+
+ r = set_put(link->manager->dirty_links, link);
+ if (r <= 0)
+ /* don't take another ref if the link was already dirty */
+ return;
+
+ link_ref(link);
+}
+
+/* The serialized state in /run is up-to-date */
+void link_clean(Link *link) {
+ assert(link);
+ assert(link->manager);
+
+ set_remove(link->manager->dirty_links, link);
+ link_unref(link);
+}
+
+static const char* const link_state_table[_LINK_STATE_MAX] = {
+ [LINK_STATE_PENDING] = "pending",
+ [LINK_STATE_ENSLAVING] = "configuring",
+ [LINK_STATE_SETTING_ADDRESSES] = "configuring",
+ [LINK_STATE_SETTING_ROUTES] = "configuring",
+ [LINK_STATE_CONFIGURED] = "configured",
+ [LINK_STATE_UNMANAGED] = "unmanaged",
+ [LINK_STATE_FAILED] = "failed",
+ [LINK_STATE_LINGER] = "linger",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
+
+static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
+ [LINK_OPERSTATE_OFF] = "off",
+ [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
+ [LINK_OPERSTATE_DORMANT] = "dormant",
+ [LINK_OPERSTATE_CARRIER] = "carrier",
+ [LINK_OPERSTATE_DEGRADED] = "degraded",
+ [LINK_OPERSTATE_ROUTABLE] = "routable",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);