diff options
Diffstat (limited to '')
| -rw-r--r-- | src/network/networkd-link.c | 3263 |
1 files changed, 3263 insertions, 0 deletions
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c new file mode 100644 index 0000000..8120343 --- /dev/null +++ b/src/network/networkd-link.c @@ -0,0 +1,3263 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <netinet/in.h> +#include <linux/if.h> +#include <linux/if_arp.h> +#include <linux/if_link.h> +#include <unistd.h> + +#include "alloc-util.h" +#include "bond.h" +#include "bridge.h" +#include "bus-util.h" +#include "dhcp-identifier.h" +#include "dhcp-lease-internal.h" +#include "env-file.h" +#include "ethtool-util.h" +#include "fd-util.h" +#include "fileio.h" +#include "ipvlan.h" +#include "missing_network.h" +#include "netlink-util.h" +#include "network-internal.h" +#include "networkd-address-label.h" +#include "networkd-address.h" +#include "networkd-can.h" +#include "networkd-dhcp-server.h" +#include "networkd-dhcp4.h" +#include "networkd-dhcp6.h" +#include "networkd-fdb.h" +#include "networkd-ipv4ll.h" +#include "networkd-ipv6-proxy-ndp.h" +#include "networkd-link-bus.h" +#include "networkd-link.h" +#include "networkd-lldp-tx.h" +#include "networkd-manager.h" +#include "networkd-mdb.h" +#include "networkd-ndisc.h" +#include "networkd-neighbor.h" +#include "networkd-nexthop.h" +#include "networkd-sriov.h" +#include "networkd-sysctl.h" +#include "networkd-radv.h" +#include "networkd-routing-policy-rule.h" +#include "networkd-wifi.h" +#include "set.h" +#include "socket-util.h" +#include "stat-util.h" +#include "stdio-util.h" +#include "string-table.h" +#include "strv.h" +#include "sysctl-util.h" +#include "tc.h" +#include "tmpfile-util.h" +#include "udev-util.h" +#include "util.h" +#include "vrf.h" + +bool link_ipv4ll_enabled(Link *link, AddressFamily mask) { + assert(link); + assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0); + + if (link->flags & IFF_LOOPBACK) + return false; + + if (!link->network) + return false; + + if (link->iftype == ARPHRD_CAN) + return false; + + if (STRPTR_IN_SET(link->kind, + "vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti", + "vti6", "nlmon", "xfrm", "bareudp")) + return false; + + /* L3 or L3S mode do not support ARP. */ + if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S)) + return false; + + if (link->network->bond) + return false; + + return link->network->link_local & mask; +} + +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; + + if (link->iftype == ARPHRD_CAN) + return false; + + if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "nlmon")) + return false; + + if (link->network->bond) + return false; + + return link->network->link_local & ADDRESS_FAMILY_IPV6; +} + +bool link_ipv6_enabled(Link *link) { + assert(link); + + if (!socket_ipv6_is_supported()) + return false; + + if (link->network->bond) + return false; + + if (link->iftype == ARPHRD_CAN) + return false; + + /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */ + if (link_ipv6ll_enabled(link)) + return true; + + if (network_has_static_ipv6_configurations(link->network)) + return true; + + return false; +} + +static bool link_is_enslaved(Link *link) { + if (link->flags & IFF_SLAVE) + /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */ + return true; + + if (!link->network) + return false; + + if (link->master_ifindex > 0 && link->network->bridge) + return true; + + /* TODO: add conditions for other netdevs. */ + + return false; +} + +static void link_update_master_operstate(Link *link, NetDev *netdev) { + Link *master; + + if (!netdev) + return; + + if (netdev->ifindex <= 0) + return; + + if (link_get(link->manager, netdev->ifindex, &master) < 0) + return; + + link_update_operstate(master, true); +} + +void link_update_operstate(Link *link, bool also_update_master) { + LinkOperationalState operstate; + LinkCarrierState carrier_state; + LinkAddressState address_state; + _cleanup_strv_free_ char **p = NULL; + uint8_t scope = RT_SCOPE_NOWHERE; + bool changed = false; + Address *address; + + assert(link); + + if (link->kernel_operstate == IF_OPER_DORMANT) + carrier_state = LINK_CARRIER_STATE_DORMANT; + else if (link_has_carrier(link)) { + if (link_is_enslaved(link)) + carrier_state = LINK_CARRIER_STATE_ENSLAVED; + else + carrier_state = LINK_CARRIER_STATE_CARRIER; + } else if (link->flags & IFF_UP) + carrier_state = LINK_CARRIER_STATE_NO_CARRIER; + else + carrier_state = LINK_CARRIER_STATE_OFF; + + if (carrier_state >= LINK_CARRIER_STATE_CARRIER) { + Link *slave; + + SET_FOREACH(slave, link->slaves) { + link_update_operstate(slave, false); + + if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER) + carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER; + } + } + + SET_FOREACH(address, link->addresses) { + 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) { + if (!address_is_ready(address)) + continue; + + if (address->scope < scope) + scope = address->scope; + } + + if (scope < RT_SCOPE_SITE) + /* universally accessible addresses found */ + address_state = LINK_ADDRESS_STATE_ROUTABLE; + else if (scope < RT_SCOPE_HOST) + /* only link or site local addresses found */ + address_state = LINK_ADDRESS_STATE_DEGRADED; + else + /* no useful addresses found */ + address_state = LINK_ADDRESS_STATE_OFF; + + /* Mapping of address and carrier state vs operational state + * carrier state + * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved + * ------------------------------------------------------------------------------ + * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved + * address_state degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved + * routable | off | no-carrier | dormant | degraded-carrier | routable | routable + */ + + if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF) + operstate = (LinkOperationalState) carrier_state; + else if (address_state == LINK_ADDRESS_STATE_ROUTABLE) + operstate = LINK_OPERSTATE_ROUTABLE; + else if (carrier_state == LINK_CARRIER_STATE_CARRIER) + operstate = LINK_OPERSTATE_DEGRADED; + else + operstate = LINK_OPERSTATE_ENSLAVED; + + if (link->carrier_state != carrier_state) { + link->carrier_state = carrier_state; + changed = true; + if (strv_extend(&p, "CarrierState") < 0) + log_oom(); + } + + if (link->address_state != address_state) { + link->address_state = address_state; + changed = true; + if (strv_extend(&p, "AddressState") < 0) + log_oom(); + } + + if (link->operstate != operstate) { + link->operstate = operstate; + changed = true; + if (strv_extend(&p, "OperationalState") < 0) + log_oom(); + } + + if (p) + link_send_changed_strv(link, p); + if (changed) + link_dirty(link); + + if (also_update_master && link->network) { + link_update_master_operstate(link, link->network->bond); + link_update_master_operstate(link, link->network->bridge); + } +} + +#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, bool force_update_operstate) { + 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 (!force_update_operstate && (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, true); + + return 0; +} + +static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) { + _cleanup_(link_unrefp) Link *link = NULL; + const char *ifname, *kind = NULL; + unsigned short iftype; + int r, ifindex; + uint16_t type; + + assert(manager); + assert(message); + assert(ret); + + /* check for link kind */ + r = sd_netlink_message_enter_container(message, IFLA_LINKINFO); + if (r == 0) { + (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind); + r = sd_netlink_message_exit_container(message); + if (r < 0) + return r; + } + + 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 = new(Link, 1); + if (!link) + return -ENOMEM; + + *link = (Link) { + .n_ref = 1, + .manager = manager, + .state = LINK_STATE_PENDING, + .ifindex = ifindex, + .iftype = iftype, + + .n_dns = (unsigned) -1, + .dns_default_route = -1, + .llmnr = _RESOLVE_SUPPORT_INVALID, + .mdns = _RESOLVE_SUPPORT_INVALID, + .dnssec_mode = _DNSSEC_MODE_INVALID, + .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID, + }; + + link->ifname = strdup(ifname); + if (!link->ifname) + return -ENOMEM; + + if (kind) { + link->kind = strdup(kind); + if (!link->kind) + return -ENOMEM; + } + + r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex); + if (r < 0) + log_link_debug_errno(link, r, "New device has no master, continuing without"); + + r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &link->hw_addr); + if (r < 0) + log_link_debug_errno(link, r, "Hardware address not found for new device, continuing without"); + + r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr); + if (r < 0) + log_link_debug_errno(link, r, "Broadcast address not found for new device, continuing without"); + + r = ethtool_get_permanent_macaddr(&manager->ethtool_fd, link->ifname, &link->permanent_mac); + if (r < 0) + log_link_debug_errno(link, r, "Permanent MAC address not found for new device, continuing without: %m"); + + r = ethtool_get_driver(&manager->ethtool_fd, link->ifname, &link->driver); + if (r < 0) + log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m"); + + r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &link->alternative_names); + if (r < 0 && r != -ENODATA) + return r; + + 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, false); + if (r < 0) + return r; + + *ret = TAKE_PTR(link); + + return 0; +} + +void link_ntp_settings_clear(Link *link) { + link->ntp = strv_free(link->ntp); +} + +void link_dns_settings_clear(Link *link) { + if (link->n_dns != (unsigned) -1) + for (unsigned i = 0; i < link->n_dns; i++) + in_addr_full_free(link->dns[i]); + link->dns = mfree(link->dns); + link->n_dns = (unsigned) -1; + + link->search_domains = ordered_set_free_free(link->search_domains); + link->route_domains = ordered_set_free_free(link->route_domains); + + link->dns_default_route = -1; + link->llmnr = _RESOLVE_SUPPORT_INVALID; + link->mdns = _RESOLVE_SUPPORT_INVALID; + link->dnssec_mode = _DNSSEC_MODE_INVALID; + link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID; + + link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors); +} + +static void link_free_engines(Link *link) { + if (!link) + return; + + link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server); + link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client); + link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease); + link->dhcp_acd = sd_ipv4acd_unref(link->dhcp_acd); + + link->lldp = sd_lldp_unref(link->lldp); + link_lldp_emit_stop(link); + + ndisc_flush(link); + + link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll); + link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); + link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease); + link->ndisc = sd_ndisc_unref(link->ndisc); + link->radv = sd_radv_unref(link->radv); + + ipv4_dad_unref(link); +} + +static Link *link_free(Link *link) { + assert(link); + + link_ntp_settings_clear(link); + link_dns_settings_clear(link); + + link->routes = set_free(link->routes); + link->routes_foreign = set_free(link->routes_foreign); + link->dhcp_routes = set_free(link->dhcp_routes); + link->dhcp_routes_old = set_free(link->dhcp_routes_old); + link->dhcp6_routes = set_free(link->dhcp6_routes); + link->dhcp6_routes_old = set_free(link->dhcp6_routes_old); + link->dhcp6_pd_routes = set_free(link->dhcp6_pd_routes); + link->dhcp6_pd_routes_old = set_free(link->dhcp6_pd_routes_old); + link->ndisc_routes = set_free(link->ndisc_routes); + + link->nexthops = set_free(link->nexthops); + link->nexthops_foreign = set_free(link->nexthops_foreign); + + link->neighbors = set_free(link->neighbors); + link->neighbors_foreign = set_free(link->neighbors_foreign); + + link->addresses = set_free(link->addresses); + link->addresses_foreign = set_free(link->addresses_foreign); + link->pool_addresses = set_free(link->pool_addresses); + link->static_addresses = set_free(link->static_addresses); + link->dhcp6_addresses = set_free(link->dhcp6_addresses); + link->dhcp6_addresses_old = set_free(link->dhcp6_addresses_old); + link->dhcp6_pd_addresses = set_free(link->dhcp6_pd_addresses); + link->dhcp6_pd_addresses_old = set_free(link->dhcp6_pd_addresses_old); + link->ndisc_addresses = set_free(link->ndisc_addresses); + + link_free_engines(link); + free(link->lease_file); + free(link->lldp_file); + + free(link->ifname); + strv_free(link->alternative_names); + free(link->kind); + free(link->ssid); + free(link->driver); + + (void) unlink(link->state_file); + free(link->state_file); + + sd_device_unref(link->sd_device); + + hashmap_free(link->bound_to_links); + hashmap_free(link->bound_by_links); + + set_free_with_destructor(link->slaves, link_unref); + + network_unref(link->network); + + return mfree(link); +} + +DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free); + +int link_get(Manager *m, int ifindex, Link **ret) { + Link *link; + + assert(m); + assert(ifindex > 0); + assert(ret); + + link = hashmap_get(m->links, INT_TO_PTR(ifindex)); + if (!link) + return -ENODEV; + + *ret = link; + + return 0; +} + +void link_set_state(Link *link, LinkState state) { + assert(link); + + if (link->state == state) + return; + + log_link_debug(link, "State changed: %s -> %s", + link_state_to_string(link->state), + link_state_to_string(state)); + + link->state = state; + + link_send_changed(link, "AdministrativeState", NULL); +} + +static void link_enter_unmanaged(Link *link) { + assert(link); + + link_set_state(link, LINK_STATE_UNMANAGED); + + link_dirty(link); +} + +int link_stop_engines(Link *link, bool may_keep_dhcp) { + int r = 0, k; + + assert(link); + assert(link->manager); + assert(link->manager->event); + + bool keep_dhcp = may_keep_dhcp && + link->network && + (link->manager->restarting || + FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP)); + + if (!keep_dhcp) { + k = sd_dhcp_client_stop(link->dhcp_client); + if (k < 0) + r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m"); + } + + k = sd_ipv4acd_stop(link->dhcp_acd); + if (k < 0) + r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client for DHCPv4: %m"); + + k = sd_dhcp_server_stop(link->dhcp_server); + if (k < 0) + r = log_link_warning_errno(link, k, "Could not stop DHCPv4 server: %m"); + + k = sd_lldp_stop(link->lldp); + if (k < 0) + r = log_link_warning_errno(link, k, "Could not stop LLDP: %m"); + + k = sd_ipv4ll_stop(link->ipv4ll); + if (k < 0) + r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m"); + + k = ipv4_dad_stop(link); + if (k < 0) + r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m"); + + k = sd_dhcp6_client_stop(link->dhcp6_client); + if (k < 0) + r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m"); + + k = dhcp6_pd_remove(link); + if (k < 0) + r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m"); + + k = sd_ndisc_stop(link->ndisc); + if (k < 0) + r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m"); + + k = sd_radv_stop(link->radv); + if (k < 0) + r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %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); + + (void) link_stop_engines(link, false); + + link_dirty(link); +} + +static int link_join_netdevs_after_configured(Link *link) { + NetDev *netdev; + int r; + + HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) { + if (netdev->ifindex > 0) + /* Assume already enslaved. */ + continue; + + if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED) + continue; + + log_struct(LOG_DEBUG, + LOG_LINK_INTERFACE(link), + LOG_NETDEV_INTERFACE(netdev), + LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname)); + + r = netdev_join(netdev, link, NULL); + if (r < 0) + return 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)); + } + + return 0; +} + +static void link_enter_configured(Link *link) { + assert(link); + assert(link->network); + + if (link->state != LINK_STATE_CONFIGURING) + return; + + link_set_state(link, LINK_STATE_CONFIGURED); + + (void) link_join_netdevs_after_configured(link); + + link_dirty(link); +} + +void link_check_ready(Link *link) { + Address *a; + + assert(link); + + if (link->state == LINK_STATE_CONFIGURED) + return; + + if (link->state != LINK_STATE_CONFIGURING) { + log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state)); + return; + } + + if (!link->network) + return; + + if (!link->addresses_configured) { + log_link_debug(link, "%s(): static addresses are not configured.", __func__); + return; + } + + if (!link->neighbors_configured) { + log_link_debug(link, "%s(): static neighbors are not configured.", __func__); + return; + } + + SET_FOREACH(a, link->addresses) + if (!address_is_ready(a)) { + _cleanup_free_ char *str = NULL; + + (void) in_addr_to_string(a->family, &a->in_addr, &str); + log_link_debug(link, "%s(): an address %s/%d is not ready.", __func__, strnull(str), a->prefixlen); + return; + } + + if (!link->static_routes_configured) { + log_link_debug(link, "%s(): static routes are not configured.", __func__); + return; + } + + if (!link->static_nexthops_configured) { + log_link_debug(link, "%s(): static nexthops are not configured.", __func__); + return; + } + + if (!link->routing_policy_rules_configured) { + log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__); + return; + } + + if (!link->tc_configured) { + log_link_debug(link, "%s(): traffic controls are not configured.", __func__); + return; + } + + if (!link->sr_iov_configured) { + log_link_debug(link, "%s(): SR-IOV is not configured.", __func__); + return; + } + + if (!link->bridge_mdb_configured) { + log_link_debug(link, "%s(): Bridge MDB is not configured.", __func__); + return; + } + + if (link_has_carrier(link) || !link->network->configure_without_carrier) { + bool has_ndisc_address = false; + NDiscAddress *n; + + if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !link->ipv4ll_address_configured) { + log_link_debug(link, "%s(): IPv4LL is not configured.", __func__); + return; + } + + if (link_ipv6ll_enabled(link) && + in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) { + log_link_debug(link, "%s(): IPv6LL is not configured.", __func__); + return; + } + + SET_FOREACH(n, link->ndisc_addresses) + if (!n->marked) { + has_ndisc_address = true; + break; + } + + if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) && + !link->dhcp_address && set_isempty(link->dhcp6_addresses) && !has_ndisc_address && + !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address_configured)) { + log_link_debug(link, "%s(): DHCP4 or DHCP6 is enabled but no dynamic address is assigned yet.", __func__); + return; + } + + if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || link_dhcp6_pd_is_enabled(link) || link_ipv6_accept_ra_enabled(link)) { + if (!link->dhcp4_configured && + !(link->dhcp6_address_configured && link->dhcp6_route_configured) && + !(link->dhcp6_pd_address_configured && link->dhcp6_pd_route_configured) && + !(link->ndisc_addresses_configured && link->ndisc_routes_configured) && + !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address_configured)) { + /* When DHCP or RA is enabled, at least one protocol must provide an address, or + * an IPv4ll fallback address must be configured. */ + log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__); + return; + } + + log_link_debug(link, "%s(): dhcp4:%s dhcp6_addresses:%s dhcp_routes:%s dhcp_pd_addresses:%s dhcp_pd_routes:%s ndisc_addresses:%s ndisc_routes:%s", + __func__, + yes_no(link->dhcp4_configured), + yes_no(link->dhcp6_address_configured), + yes_no(link->dhcp6_route_configured), + yes_no(link->dhcp6_pd_address_configured), + yes_no(link->dhcp6_pd_route_configured), + yes_no(link->ndisc_addresses_configured), + yes_no(link->ndisc_routes_configured)); + } + } + + link_enter_configured(link); + + return; +} + +static int link_set_static_configs(Link *link) { + int r; + + assert(link); + assert(link->network); + assert(link->state != _LINK_STATE_INVALID); + + /* Reset all *_configured flags we are configuring. */ + link->request_static_addresses = false; + link->addresses_configured = false; + link->addresses_ready = false; + link->neighbors_configured = false; + link->static_routes_configured = false; + link->static_nexthops_configured = false; + link->routing_policy_rules_configured = false; + + r = link_set_bridge_fdb(link); + if (r < 0) + return r; + + r = link_set_bridge_mdb(link); + if (r < 0) + return r; + + r = link_set_neighbors(link); + if (r < 0) + return r; + + r = link_set_addresses(link); + if (r < 0) + return r; + + r = link_set_address_labels(link); + if (r < 0) + return r; + + /* now that we can figure out a default address for the dhcp server, start it */ + r = dhcp4_server_configure(link); + if (r < 0) + return r; + + return 0; +} + +static int link_configure_continue(Link *link); + +static int link_mac_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + 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_message_warning_errno(link, m, r, "Could not set MAC address, ignoring"); + else + log_link_debug(link, "Setting MAC address done."); + + return 1; +} + +static int link_set_mac(Link *link) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + int r; + + assert(link); + assert(link->network); + assert(link->manager); + assert(link->manager->rtnl); + + if (!link->network->mac) + return 0; + + log_link_debug(link, "Setting MAC address"); + + 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_ether_addr(req, IFLA_ADDRESS, link->network->mac); + if (r < 0) + return log_link_error_errno(link, r, "Could not set MAC address: %m"); + + r = netlink_call_async(link->manager->rtnl, NULL, req, link_mac_handler, + link_netlink_destroy_callback, link); + if (r < 0) + return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); + + link_ref(link); + + return 0; +} + +static int link_nomaster_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + 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_message_warning_errno(link, m, r, "Could not set nomaster, ignoring"); + else + log_link_debug(link, "Setting nomaster done."); + + return 1; +} + +static int link_set_nomaster(Link *link) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + int r; + + assert(link); + assert(link->network); + assert(link->manager); + assert(link->manager->rtnl); + + /* set it free if not enslaved with networkd */ + if (link->network->bridge || link->network->bond || link->network->vrf) + return 0; + + log_link_debug(link, "Setting nomaster"); + + 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_MASTER, 0); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m"); + + r = netlink_call_async(link->manager->rtnl, NULL, req, link_nomaster_handler, + link_netlink_destroy_callback, link); + if (r < 0) + return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); + + link_ref(link); + + return 0; +} + +static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + int r; + + assert(m); + assert(link); + assert(link->ifname); + + link->setting_mtu = false; + + 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_message_warning_errno(link, m, r, "Could not set MTU, ignoring"); + else + log_link_debug(link, "Setting MTU done."); + + if (link->state == LINK_STATE_INITIALIZED) { + r = link_configure_continue(link); + if (r < 0) + link_enter_failed(link); + } + + 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); + + if (mtu == 0 || link->setting_mtu) + return 0; + + if (link->mtu == mtu) + return 0; + + 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"); + + /* 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) && 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"); + + mtu = IPV6_MIN_MTU; + } + + 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 = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler, + link_netlink_destroy_callback, link); + if (r < 0) + return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); + + link_ref(link); + link->setting_mtu = true; + + return 0; +} + +static bool link_reduces_vlan_mtu(Link *link) { + /* See netif_reduces_vlan_mtu() in kernel. */ + return streq_ptr(link->kind, "macsec"); +} + +static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) { + uint32_t mtu = 0; + NetDev *dev; + + HASHMAP_FOREACH(dev, link->network->stacked_netdevs) + if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0) + /* See vlan_dev_change_mtu() in kernel. */ + mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu); + + else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu) + /* See macvlan_change_mtu() in kernel. */ + mtu = dev->mtu; + + return mtu; +} + +static int link_configure_mtu(Link *link) { + uint32_t mtu; + + assert(link); + assert(link->network); + + if (link->network->mtu > 0) + return link_set_mtu(link, link->network->mtu); + + mtu = link_get_requested_mtu_by_stacked_netdevs(link); + if (link->mtu >= mtu) + return 0; + + log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. " + "If it is not desired, then please explicitly specify MTUBytes= setting.", + link->mtu, mtu); + + return link_set_mtu(link, mtu); +} + +static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + 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_message_warning_errno(link, m, r, "Could not set link flags, ignoring"); + + return 1; +} + +static int link_set_flags(Link *link) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + unsigned ifi_change = 0; + unsigned ifi_flags = 0; + int r; + + assert(link); + assert(link->manager); + assert(link->manager->rtnl); + + if (link->flags & IFF_LOOPBACK) + return 0; + + if (!link->network) + return 0; + + if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0) + return 0; + + 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"); + + if (link->network->arp >= 0) { + ifi_change |= IFF_NOARP; + SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0); + } + + if (link->network->multicast >= 0) { + ifi_change |= IFF_MULTICAST; + SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast); + } + + if (link->network->allmulticast >= 0) { + ifi_change |= IFF_ALLMULTI; + SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast); + } + + r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change); + if (r < 0) + return log_link_error_errno(link, r, "Could not set link flags: %m"); + + r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler, + link_netlink_destroy_callback, link); + if (r < 0) + return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); + + link_ref(link); + + return 0; +} + +static int link_acquire_ipv6_conf(Link *link) { + int r; + + assert(link); + + if (link->ndisc) { + log_link_debug(link, "Discovering IPv6 routers"); + + r = sd_ndisc_start(link->ndisc); + if (r < 0 && r != -EBUSY) + return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m"); + } + + if (link->radv) { + assert(link->radv); + assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0); + + log_link_debug(link, "Starting IPv6 Router Advertisements"); + + r = radv_emit_dns(link); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m"); + + r = sd_radv_start(link->radv); + if (r < 0 && r != -EBUSY) + return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m"); + } + + if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra, + DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST, + DHCP6_CLIENT_START_MODE_SOLICIT)) { + assert(link->dhcp6_client); + assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0); + + r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST); + if (r < 0 && r != -EBUSY) + return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m"); + else + log_link_debug(link, "Acquiring DHCPv6 lease"); + } + + r = dhcp6_request_prefix_delegation(link); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to request DHCPv6 prefix delegation: %m"); + + return 0; +} + +static int link_acquire_ipv4_conf(Link *link) { + int r; + + assert(link); + assert(link->manager); + assert(link->manager->event); + + if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) { + 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->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)) { + r = link_acquire_ipv6_conf(link); + if (r < 0) + return r; + } + + 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 (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) && + !FLAGS_SET(link->flags, IFF_DORMANT)) + return true; + + return false; +} + +static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + int r; + + assert(link); + + link->setting_genmode = false; + + 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_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring"); + else + log_link_debug(link, "Setting address genmode done."); + + if (link->state == LINK_STATE_INITIALIZED) { + r = link_configure_continue(link); + if (r < 0) + link_enter_failed(link); + } + + return 1; +} + +static int link_configure_addrgen_mode(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); + + if (!socket_ipv6_is_supported() || link->setting_genmode) + return 0; + + log_link_debug(link, "Setting address genmode for link"); + + 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_open_container(req, IFLA_AF_SPEC); + if (r < 0) + return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m"); + + 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"); + + if (!link_ipv6ll_enabled(link)) + ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE; + else if (link->network->ipv6ll_address_gen_mode < 0) { + r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL); + if (r < 0) { + /* The file may not exist. And even if it exists, when stable_secret is unset, + * reading the file fails with EIO. */ + log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m"); + + ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64; + } else + ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; + } else + ipv6ll_mode = link->network->ipv6ll_address_gen_mode; + + 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"); + + 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 = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler, + link_netlink_destroy_callback, link); + if (r < 0) + return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); + + link_ref(link); + link->setting_genmode = true; + + return 0; +} + +static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + 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_message_warning_errno(link, m, r, "Could not bring up interface"); + + return 1; +} + +static int link_up(Link *link) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + 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"); + + r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler, + link_netlink_destroy_callback, link); + 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, Link *link) { + 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_message_warning_errno(link, m, r, "Could not bring down interface"); + + return 1; +} + +int link_down(Link *link, link_netlink_message_handler_t callback) { + _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 = netlink_call_async(link->manager->rtnl, NULL, req, + callback ?: link_down_handler, + link_netlink_destroy_callback, link); + if (r < 0) + return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); + + link_ref(link); + + return 0; +} + +static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + 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_message_warning_errno(link, m, r, "Could not set group for the interface"); + + return 1; +} + +static int link_set_group(Link *link) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + int r; + + assert(link); + assert(link->network); + assert(link->manager); + assert(link->manager->rtnl); + + if (link->network->group <= 0) + return 0; + + log_link_debug(link, "Setting group"); + + 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_GROUP, link->network->group); + if (r < 0) + return log_link_error_errno(link, r, "Could not set link group: %m"); + + r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler, + link_netlink_destroy_callback, link); + 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; + 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) + if (link_has_carrier(l)) { + required_up = true; + break; + } + + if (!required_up && link_is_up) { + r = link_down(link, NULL); + 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) { + Link *l; + int r; + + assert(link); + + if (hashmap_isempty(link->bound_by_links)) + return 0; + + HASHMAP_FOREACH (l, link->bound_by_links) { + 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; + int r; + bool list_updated = false; + + assert(link); + assert(link->manager); + + m = link->manager; + + HASHMAP_FOREACH(carrier, m->links) { + if (!carrier->network) + continue; + + if (strv_isempty(carrier->network->bind_carrier)) + continue; + + if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) { + 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) { + 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; + 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) { + if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) { + 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) { + 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; + + HASHMAP_FOREACH (bound_to, link->bound_to_links) { + 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; + + HASHMAP_FOREACH (bound_by, link->bound_by_links) { + 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; +} + +static int link_append_to_master(Link *link, NetDev *netdev) { + Link *master; + int r; + + assert(link); + assert(netdev); + + r = link_get(link->manager, netdev->ifindex, &master); + if (r < 0) + return r; + + r = set_ensure_put(&master->slaves, NULL, link); + if (r <= 0) + return r; + + link_ref(link); + return 0; +} + +static void link_drop_from_master(Link *link, NetDev *netdev) { + Link *master; + + assert(link); + + if (!link->manager || !netdev) + return; + + if (link_get(link->manager, netdev->ifindex, &master) < 0) + return; + + link_unref(set_remove(master->slaves, link)); +} + +static void link_detach_from_manager(Link *link) { + if (!link || !link->manager) + return; + + link_unref(set_remove(link->manager->links_requesting_uuid, link)); + link_clean(link); + + /* The following must be called at last. */ + assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link); + link_unref(link); +} + +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); + + if (link->network) { + link_drop_from_master(link, link->network->bridge); + link_drop_from_master(link, link->network->bond); + } + + log_link_debug(link, "Link removed"); + + (void) unlink(link->state_file); + link_detach_from_manager(link); +} + +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"); + + r = link_append_to_master(link, link->network->bridge); + if (r < 0) + log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m"); + } + + if (link->network->bond) { + r = link_set_bond(link); + if (r < 0) + log_link_error_errno(link, r, "Could not set bond message: %m"); + + r = link_append_to_master(link, link->network->bond); + if (r < 0) + log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m"); + } + + r = link_set_bridge_vlan(link); + if (r < 0) + log_link_error_errno(link, r, "Could not set bridge vlan: %m"); + + /* Skip setting up addresses until it gets carrier, + or it would try to set addresses twice, + which is bad for non-idempotent steps. */ + if (!link_has_carrier(link) && !link->network->configure_without_carrier) + return 0; + + link_set_state(link, LINK_STATE_CONFIGURING); + + r = link_acquire_conf(link); + if (r < 0) + return r; + + return link_set_static_configs(link); +} + +static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + int r; + + assert(link); + assert(link->network); + assert(link->enslaving > 0); + + 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_message_warning_errno(link, m, r, "Could not join netdev"); + link_enter_failed(link); + return 1; + } + + log_link_debug(link, "Joined netdev"); + + if (link->enslaving == 0) { + r = link_joined(link); + if (r < 0) + link_enter_failed(link); + } + + return 1; +} + +static int link_enter_join_netdev(Link *link) { + NetDev *netdev; + int r; + + assert(link); + assert(link->network); + assert(link->state == LINK_STATE_INITIALIZED); + + link_set_state(link, LINK_STATE_CONFIGURING); + + link_dirty(link); + link->enslaving = 0; + + if (link->network->bond) { + if (link->network->bond->state == NETDEV_STATE_READY && + link->network->bond->ifindex == link->master_ifindex) + return link_joined(link); + + 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)); + + link->enslaving++; + + 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)); + link_enter_failed(link); + return r; + } + } + + 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)); + + link->enslaving++; + + 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)); + link_enter_failed(link); + return r; + } + } + + if (link->network->vrf) { + log_struct(LOG_DEBUG, + LOG_LINK_INTERFACE(link), + LOG_NETDEV_INTERFACE(link->network->vrf), + LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname)); + + link->enslaving++; + + r = netdev_join(link->network->vrf, link, netdev_join_handler); + if (r < 0) { + log_struct_errno(LOG_WARNING, r, + LOG_LINK_INTERFACE(link), + LOG_NETDEV_INTERFACE(link->network->vrf), + LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname)); + link_enter_failed(link); + return r; + } + } + + HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) { + + if (netdev->ifindex > 0) + /* Assume already enslaved. */ + continue; + + if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED) + continue; + + log_struct(LOG_DEBUG, + LOG_LINK_INTERFACE(link), + LOG_NETDEV_INTERFACE(netdev), + LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname)); + + link->enslaving++; + + 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)); + link_enter_failed(link); + return r; + } + } + + if (link->enslaving == 0) + return link_joined(link); + + return 0; +} + +static int link_drop_foreign_config(Link *link) { + int r; + + r = link_drop_foreign_addresses(link); + if (r < 0) + return r; + + r = link_drop_foreign_neighbors(link); + if (r < 0) + return r; + + return link_drop_foreign_routes(link); +} + +static int link_drop_config(Link *link) { + int r; + + r = link_drop_addresses(link); + if (r < 0) + return r; + + r = link_drop_neighbors(link); + if (r < 0) + return r; + + r = link_drop_routes(link); + if (r < 0) + return r; + + ndisc_flush(link); + + return 0; +} + +int link_configure(Link *link) { + int r; + + assert(link); + assert(link->network); + assert(link->state == LINK_STATE_INITIALIZED); + + r = link_configure_traffic_control(link); + if (r < 0) + return r; + + r = link_configure_sr_iov(link); + if (r < 0) + return r; + + if (link->iftype == ARPHRD_CAN) + return link_configure_can(link); + + r = link_set_sysctl(link); + if (r < 0) + return r; + + r = link_set_ipv6_proxy_ndp_addresses(link); + if (r < 0) + return r; + + r = link_set_mac(link); + if (r < 0) + return r; + + r = link_set_nomaster(link); + if (r < 0) + return r; + + r = link_set_flags(link); + if (r < 0) + return r; + + r = link_set_group(link); + if (r < 0) + return r; + + r = ipv4ll_configure(link); + if (r < 0) + return r; + + r = dhcp4_configure(link); + if (r < 0) + return r; + + r = dhcp6_configure(link); + if (r < 0) + return r; + + r = ndisc_configure(link); + if (r < 0) + return r; + + r = radv_configure(link); + if (r < 0) + return r; + + r = link_lldp_rx_configure(link); + if (r < 0) + return r; + + r = link_configure_mtu(link); + if (r < 0) + return r; + + r = link_configure_addrgen_mode(link); + if (r < 0) + return r; + + return link_configure_continue(link); +} + +/* The configuration continues in this separate function, instead of + * including this in the above link_configure() function, for two + * reasons: + * 1) some devices reset the link when the mtu is set, which caused + * an infinite loop here in networkd; see: + * https://github.com/systemd/systemd/issues/6593 + * https://github.com/systemd/systemd/issues/9831 + * 2) if ipv6ll is disabled, then bringing the interface up must be + * delayed until after we get confirmation from the kernel that + * the addr_gen_mode parameter has been set (via netlink), see: + * https://github.com/systemd/systemd/issues/13882 + */ +static int link_configure_continue(Link *link) { + int r; + + assert(link); + assert(link->network); + assert(link->state == LINK_STATE_INITIALIZED); + + if (link->setting_mtu || link->setting_genmode) + return 0; + + /* 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->keep_configuration != KEEP_CONFIGURATION_YES) { + r = link_drop_foreign_config(link); + if (r < 0) + return r; + } + + /* The kernel resets ipv6 mtu after changing device mtu; + * we must set this here, after we've set device mtu */ + r = link_set_ipv6_mtu(link); + if (r < 0) + log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface, ignoring: %m"); + + return link_enter_join_netdev(link); +} + +static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) { + _cleanup_strv_free_ char **s = NULL; + Network *network; + int r; + + assert(m); + + r = sd_netlink_message_get_errno(m); + if (r < 0) + return r; + + r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s); + if (r < 0 && r != -ENODATA) + return r; + + strv_free_and_replace(link->alternative_names, s); + + r = network_get(link->manager, link->iftype, link->sd_device, + link->ifname, link->alternative_names, link->driver, + &link->hw_addr.addr.ether, &link->permanent_mac, + link->wlan_iftype, link->ssid, &link->bssid, &network); + if (r == -ENOENT) { + link_enter_unmanaged(link); + return 0; + } else if (r == 0 && network->unmanaged) { + link_enter_unmanaged(link); + return 0; + } else if (r < 0) + return r; + + if (link->network == network && !force) + return 0; + + log_link_info(link, "Re-configuring with %s", network->filename); + + /* Dropping old .network file */ + r = link_stop_engines(link, false); + if (r < 0) + return r; + + r = link_drop_config(link); + if (r < 0) + return r; + + if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) { + log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state)); + r = link_drop_foreign_config(link); + if (r < 0) + return r; + } + + link_free_carrier_maps(link); + link_free_engines(link); + link->network = network_unref(link->network); + + /* Then, apply new .network file */ + r = network_apply(network, link); + if (r < 0) + return r; + + r = link_new_carrier_maps(link); + if (r < 0) + return r; + + link_set_state(link, LINK_STATE_INITIALIZED); + link_dirty(link); + + /* link_configure_duid() returns 0 if it requests product UUID. In that case, + * link_configure() is called later asynchronously. */ + r = link_configure_duid(link); + if (r <= 0) + return r; + + r = link_configure(link); + if (r < 0) + return r; + + return 0; +} + +static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + int r; + + r = link_reconfigure_internal(link, m, false); + if (r < 0) + link_enter_failed(link); + + return 1; +} + +static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + int r; + + r = link_reconfigure_internal(link, m, true); + if (r < 0) + link_enter_failed(link); + + return 1; +} + +int link_reconfigure(Link *link, bool force) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + int r; + + /* When link in pending or initialized state, then link_configure() will be called. To prevent + * the function be called multiple times simultaneously, refuse to reconfigure the interface in + * these case. */ + if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER)) + return 0; /* o means no-op. */ + + r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, + link->ifindex); + if (r < 0) + return r; + + r = netlink_call_async(link->manager->rtnl, NULL, req, + force ? link_force_reconfigure_handler : link_reconfigure_handler, + link_netlink_destroy_callback, link); + if (r < 0) + return r; + + link_ref(link); + + return 1; /* 1 means the interface will be reconfigured. */ +} + +static int link_initialized_and_synced(Link *link) { + Network *network; + int r; + + assert(link); + assert(link->ifname); + assert(link->manager); + + /* We may get called either from the asynchronous netlink callback, + * or directly for link_add() if running in a container. See link_add(). */ + if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) + return 0; + + log_link_debug(link, "Link state is up-to-date"); + link_set_state(link, LINK_STATE_INITIALIZED); + + 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 = wifi_get_info(link); + if (r < 0) + return r; + + r = network_get(link->manager, link->iftype, link->sd_device, + link->ifname, link->alternative_names, link->driver, + &link->hw_addr.addr.ether, &link->permanent_mac, + link->wlan_iftype, link->ssid, &link->bssid, &network); + if (r == -ENOENT) { + link_enter_unmanaged(link); + return 0; + } else if (r == 0 && network->unmanaged) { + link_enter_unmanaged(link); + return 0; + } 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(network, link); + if (r < 0) + return r; + } + + r = link_new_bound_to_list(link); + if (r < 0) + return r; + + /* link_configure_duid() returns 0 if it requests product UUID. In that case, + * link_configure() is called later asynchronously. */ + r = link_configure_duid(link); + if (r <= 0) + return r; + + r = link_configure(link); + if (r < 0) + return r; + + return 0; +} + +static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + _cleanup_strv_free_ char **s = NULL; + int r; + + r = sd_netlink_message_get_errno(m); + if (r < 0) { + log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m"); + link_enter_failed(link); + return 0; + } + + r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s); + if (r < 0 && r != -ENODATA) { + link_enter_failed(link); + return 0; + } + + strv_free_and_replace(link->alternative_names, s); + + r = link_initialized_and_synced(link); + if (r < 0) + link_enter_failed(link); + return 1; +} + +int link_initialized(Link *link, sd_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->sd_device) + return 0; + + log_link_debug(link, "udev initialized link"); + link_set_state(link, LINK_STATE_INITIALIZED); + + link->sd_device = sd_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 = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler, + link_netlink_destroy_callback, link); + 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; + int r; + + assert(link); + + r = parse_env_file(NULL, link->state_file, + "NETWORK_FILE", &network_file, + "ADDRESSES", &addresses, + "ROUTES", &routes, + "DHCP4_ADDRESS", &dhcp4_address, + "IPV4LL_ADDRESS", &ipv4ll_address); + 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(network, link); + if (r < 0) + return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file)); + } + +network_file_fail: + + r = link_deserialize_addresses(link, addresses); + if (r < 0) + log_link_warning_errno(link, r, "Failed to load addresses from %s, ignoring: %m", link->state_file); + + r = link_deserialize_routes(link, routes); + if (r < 0) + log_link_warning_errno(link, r, "Failed to load routes from %s, ignoring: %m", link->state_file); + + r = link_deserialize_dhcp4(link, dhcp4_address); + if (r < 0) + log_link_warning_errno(link, r, "Failed to load DHCPv4 address from %s, ignoring: %m", link->state_file); + + r = link_deserialize_ipv4ll(link, ipv4ll_address); + if (r < 0) + log_link_warning_errno(link, r, "Failed to load IPv4LL address from %s, ignoring: %m", link->state_file); + + return 0; +} + +int link_add(Manager *m, sd_netlink_message *message, Link **ret) { + _cleanup_(sd_device_unrefp) sd_device *device = NULL; + char ifindex_str[2 + DECIMAL_STR_MAX(int)]; + Link *link; + 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 (path_is_read_only_fs("/sys") <= 0) { + /* udev should be around */ + sprintf(ifindex_str, "n%d", link->ifindex); + r = sd_device_new_from_device_id(&device, ifindex_str); + if (r < 0) { + log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m"); + return 0; + } + + r = sd_device_get_is_initialized(device); + if (r < 0) { + log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m"); + goto failed; + } + if (r == 0) { + /* not yet ready */ + log_link_debug(link, "link pending udev initialization..."); + return 0; + } + + r = device_is_renaming(device); + if (r < 0) { + log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m"); + goto failed; + } + if (r > 0) { + log_link_debug(link, "Interface is being renamed, pending initialization."); + return 0; + } + + r = link_initialized(link, device); + if (r < 0) + goto failed; + } else { + r = link_initialized_and_synced(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_CONFIGURING, LINK_STATE_CONFIGURED)) { + 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); + + r = wifi_get_info(link); + if (r < 0) + return r; + if (r > 0) { + r = link_reconfigure(link, false); + if (r < 0) { + link_enter_failed(link); + return r; + } + } + + if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) { + r = link_acquire_conf(link); + if (r < 0) { + link_enter_failed(link); + return r; + } + + link_set_state(link, LINK_STATE_CONFIGURING); + r = link_set_static_configs(link); + if (r < 0) + return r; + } + + r = link_handle_bound_by_list(link); + if (r < 0) + return r; + + if (!link->bridge_mdb_configured) { + r = link_set_bridge_mdb(link); + if (r < 0) + return r; + } + + if (streq_ptr(link->kind, "bridge")) { + Link *slave; + + SET_FOREACH(slave, link->slaves) { + if (slave->bridge_mdb_configured) + continue; + + r = link_set_bridge_mdb(slave); + if (r < 0) + link_enter_failed(slave); + } + } + + return 0; +} + +static int link_carrier_lost(Link *link) { + int r; + + assert(link); + + if (link->network && link->network->ignore_carrier_loss) + return 0; + + /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop. + * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the + * configuration and stop the clients as well. */ + if (link->setting_mtu) + return 0; + + r = link_stop_engines(link, false); + if (r < 0) { + link_enter_failed(link); + return r; + } + + r = link_drop_config(link); + if (r < 0) + return r; + + if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) { + log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state)); + r = link_drop_foreign_config(link); + if (r < 0) + 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; +} + +/* This is called every time an interface admin state changes to up; + * specifically, when IFF_UP flag changes from unset to set */ +static int link_admin_state_up(Link *link) { + int r; + + /* We set the ipv6 mtu after the device mtu, but the kernel resets + * ipv6 mtu on NETDEV_UP, so we need to reset it. The check for + * ipv6_mtu_set prevents this from trying to set it too early before + * the link->network has been setup; we only need to reset it + * here if we've already set it during normal initialization. */ + if (link->ipv6_mtu_set) { + r = link_set_ipv6_mtu(link); + if (r < 0) + return r; + } + + return 0; +} + +int link_update(Link *link, sd_netlink_message *m) { + _cleanup_strv_free_ char **s = NULL; + hw_addr_data hw_addr; + const char *ifname; + uint32_t mtu; + bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up; + int old_master, r; + + assert(link); + assert(link->ifname); + assert(m); + + if (link->state == LINK_STATE_LINGER) { + log_link_info(link, "Link re-added"); + link_set_state(link, LINK_STATE_CONFIGURING); + + 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)) { + Manager *manager = link->manager; + + log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname); + + link_drop(link); + r = link_add(manager, m, &link); + if (r < 0) + return r; + } + + r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s); + if (r >= 0) + strv_free_and_replace(link->alternative_names, s); + + r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu); + if (r >= 0 && mtu > 0) { + link->mtu = mtu; + if (link->original_mtu == 0) { + 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) + return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m"); + } + + if (link->radv) { + r = sd_radv_set_mtu(link->radv, link->mtu); + if (r < 0) + return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m"); + } + } + + /* The kernel may broadcast NEWLINK messages without the MAC address + set, simply ignore them. */ + r = netlink_message_read_hw_addr(m, IFLA_ADDRESS, &hw_addr); + if (r >= 0 && (link->hw_addr.length != hw_addr.length || + memcmp(link->hw_addr.addr.bytes, hw_addr.addr.bytes, hw_addr.length) != 0)) { + + memcpy(link->hw_addr.addr.bytes, hw_addr.addr.bytes, hw_addr.length); + + log_link_debug(link, "Gained new hardware address: %s", HW_ADDR_TO_STR(&hw_addr)); + + r = ipv4ll_update_mac(link); + if (r < 0) + return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m"); + + r = dhcp4_update_mac(link); + if (r < 0) + return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m"); + + r = dhcp6_update_mac(link); + if (r < 0) + return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m"); + + r = radv_update_mac(link); + if (r < 0) + return log_link_warning_errno(link, r, "Could not update MAC address for Router Advertisement: %m"); + + if (link->ndisc) { + r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.addr.ether); + if (r < 0) + return log_link_warning_errno(link, r, "Could not update MAC for NDisc: %m"); + } + + r = ipv4_dad_update_mac(link); + if (r < 0) + return log_link_warning_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m"); + } + + old_master = link->master_ifindex; + (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex); + + link_was_admin_up = link->flags & IFF_UP; + had_carrier = link_has_carrier(link); + + r = link_update_flags(link, m, old_master != link->master_ifindex); + if (r < 0) + return r; + + if (!link_was_admin_up && (link->flags & IFF_UP)) { + log_link_info(link, "Link UP"); + + r = link_admin_state_up(link); + if (r < 0) + return r; + } else if (link_was_admin_up && !(link->flags & IFF_UP)) + log_link_info(link, "Link DOWN"); + + 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; + Link *link; + + assert(f); + assert(prefix); + + if (hashmap_isempty(h)) + return; + + fputs(prefix, f); + HASHMAP_FOREACH(link, h) { + if (space) + fputc(' ', f); + + fprintf(f, "%i", link->ifindex); + space = true; + } + + fputc('\n', f); +} + +static void link_save_dns(Link *link, FILE *f, struct in_addr_full **dns, unsigned n_dns, bool *space) { + for (unsigned j = 0; j < n_dns; j++) { + const char *str; + + if (dns[j]->ifindex != 0 && dns[j]->ifindex != link->ifindex) + continue; + + str = in_addr_full_to_string(dns[j]); + if (!str) + continue; + + if (*space) + fputc(' ', f); + fputs(str, f); + *space = true; + } +} + +static void serialize_addresses( + FILE *f, + const char *lvalue, + bool *space, + char **addresses, + sd_dhcp_lease *lease, + bool conditional, + sd_dhcp_lease_server_type what, + sd_dhcp6_lease *lease6, + bool conditional6, + int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**), + int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) { + int r; + + bool _space = false; + if (!space) + space = &_space; + + if (lvalue) + fprintf(f, "%s=", lvalue); + fputstrv(f, addresses, NULL, space); + + if (lease && conditional) { + const struct in_addr *lease_addresses; + + r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses); + if (r > 0) + serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local); + } + + if (lease6 && conditional6 && lease6_get_addr) { + const struct in6_addr *in6_addrs; + + r = lease6_get_addr(lease6, &in6_addrs); + if (r > 0) + serialize_in6_addrs(f, in6_addrs, r, space); + } + + if (lease6 && conditional6 && lease6_get_fqdn) { + char **in6_hosts; + + r = lease6_get_fqdn(lease6, &in6_hosts); + if (r > 0) + fputstrv(f, in6_hosts, NULL, space); + } + + if (lvalue) + fputc('\n', f); +} + +int link_save(Link *link) { + const char *admin_state, *oper_state, *carrier_state, *address_state; + _cleanup_free_ char *temp_path = NULL; + _cleanup_fclose_ FILE *f = NULL; + int r; + + assert(link); + assert(link->state_file); + assert(link->lease_file); + assert(link->manager); + + if (link->state == LINK_STATE_LINGER) { + (void) 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); + + carrier_state = link_carrier_state_to_string(link->carrier_state); + assert(carrier_state); + + address_state = link_address_state_to_string(link->address_state); + assert(address_state); + + r = fopen_temporary(link->state_file, &f, &temp_path); + if (r < 0) + goto fail; + + (void) fchmod(fileno(f), 0644); + + fprintf(f, + "# This is private data. Do not parse.\n" + "ADMIN_STATE=%s\n" + "OPER_STATE=%s\n" + "CARRIER_STATE=%s\n" + "ADDRESS_STATE=%s\n", + admin_state, oper_state, carrier_state, address_state); + + if (link->network) { + char **dhcp6_domains = NULL, **dhcp_domains = NULL; + const char *dhcp_domainname = NULL, *p; + bool space; + + fprintf(f, "REQUIRED_FOR_ONLINE=%s\n", + yes_no(link->network->required_for_online)); + + LinkOperationalStateRange st = link->network->required_operstate_for_online; + fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n", + strempty(link_operstate_to_string(st.min)), + st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "", + st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : ""); + + fprintf(f, "NETWORK_FILE=%s\n", link->network->filename); + + /************************************************************/ + + fputs("DNS=", f); + space = false; + if (link->n_dns != (unsigned) -1) + link_save_dns(link, f, link->dns, link->n_dns, &space); + else + link_save_dns(link, f, link->network->dns, link->network->n_dns, &space); + + serialize_addresses(f, NULL, &space, + NULL, + link->dhcp_lease, + link->network->dhcp_use_dns, + SD_DHCP_LEASE_DNS, + link->dhcp6_lease, + link->network->dhcp6_use_dns, + sd_dhcp6_lease_get_dns, + NULL); + + /* Make sure to flush out old entries before we use the NDisc data */ + ndisc_vacuum(link); + + if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) { + NDiscRDNSS *dd; + + SET_FOREACH(dd, link->ndisc_rdnss) + serialize_in6_addrs(f, &dd->address, 1, &space); + } + + fputc('\n', f); + + /************************************************************/ + + serialize_addresses(f, "NTP", NULL, + link->ntp ?: link->network->ntp, + link->dhcp_lease, + link->network->dhcp_use_ntp, + SD_DHCP_LEASE_NTP, + link->dhcp6_lease, + link->network->dhcp6_use_ntp, + sd_dhcp6_lease_get_ntp_addrs, + sd_dhcp6_lease_get_ntp_fqdn); + + serialize_addresses(f, "SIP", NULL, + NULL, + link->dhcp_lease, + link->network->dhcp_use_sip, + SD_DHCP_LEASE_SIP, + NULL, false, NULL, NULL); + + /************************************************************/ + + 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); + (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains); + } + if (link->dhcp6_lease) + (void) sd_dhcp6_lease_get_domains(link->dhcp6_lease, &dhcp6_domains); + } + + fputs("DOMAINS=", f); + space = false; + ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains) + fputs_with_space(f, p, NULL, &space); + + if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) { + if (dhcp_domainname) + fputs_with_space(f, dhcp_domainname, NULL, &space); + if (dhcp_domains) + fputstrv(f, dhcp_domains, NULL, &space); + if (dhcp6_domains) + fputstrv(f, dhcp6_domains, NULL, &space); + } + + if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) { + NDiscDNSSL *dd; + + SET_FOREACH(dd, link->ndisc_dnssl) + fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space); + } + + fputc('\n', f); + + /************************************************************/ + + fputs("ROUTE_DOMAINS=", f); + space = false; + ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains) + fputs_with_space(f, p, NULL, &space); + + if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) { + if (dhcp_domainname) + fputs_with_space(f, dhcp_domainname, NULL, &space); + if (dhcp_domains) + fputstrv(f, dhcp_domains, NULL, &space); + if (dhcp6_domains) + fputstrv(f, dhcp6_domains, NULL, &space); + } + + if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) { + NDiscDNSSL *dd; + + SET_FOREACH(dd, link->ndisc_dnssl) + fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space); + } + + fputc('\n', f); + + /************************************************************/ + + fprintf(f, "LLMNR=%s\n", + resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr)); + + /************************************************************/ + + fprintf(f, "MDNS=%s\n", + resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns)); + + /************************************************************/ + + int dns_default_route = + link->dns_default_route >= 0 ? link->dns_default_route : + link->network->dns_default_route; + if (dns_default_route >= 0) + fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route)); + + /************************************************************/ + + DnsOverTlsMode dns_over_tls_mode = + link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode : + link->network->dns_over_tls_mode; + if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID) + fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode)); + + /************************************************************/ + + DnssecMode dnssec_mode = + link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode : + link->network->dnssec_mode; + if (dnssec_mode != _DNSSEC_MODE_INVALID) + fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode)); + + /************************************************************/ + + Set *nta_anchors = link->dnssec_negative_trust_anchors; + if (set_isempty(nta_anchors)) + nta_anchors = link->network->dnssec_negative_trust_anchors; + + if (!set_isempty(nta_anchors)) { + const char *n; + + fputs("DNSSEC_NTA=", f); + space = false; + SET_FOREACH(n, nta_anchors) + fputs_with_space(f, n, NULL, &space); + fputc('\n', f); + } + + /************************************************************/ + + r = link_serialize_addresses(link, f); + if (r < 0) + goto fail; + + /************************************************************/ + + r = link_serialize_routes(link, f); + if (r < 0) + goto fail; + } + + 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) { + 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 + (void) unlink(link->lease_file); + + r = link_serialize_ipv4ll(link, f); + if (r < 0) + goto fail; + + r = link_serialize_dhcp6_client(link, f); + if (r < 0) + goto fail; + + 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_put(&link->manager->dirty_links, NULL, link); + if (r <= 0) + /* Ignore allocation errors and 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); + + link_unref(set_remove(link->manager->dirty_links, link)); +} + +int link_save_and_clean(Link *link) { + int r; + + r = link_save(link); + if (r < 0) + return r; + + link_clean(link); + return 0; +} + +static const char* const link_state_table[_LINK_STATE_MAX] = { + [LINK_STATE_PENDING] = "pending", + [LINK_STATE_INITIALIZED] = "initialized", + [LINK_STATE_CONFIGURING] = "configuring", + [LINK_STATE_CONFIGURED] = "configured", + [LINK_STATE_UNMANAGED] = "unmanaged", + [LINK_STATE_FAILED] = "failed", + [LINK_STATE_LINGER] = "linger", +}; + +DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState); + +int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) { + const char *err_msg = NULL; + + (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg); + return log_link_full_errno(link, level, err, + "%s: %s%s%s%m", + msg, + strempty(err_msg), + err_msg && !endswith(err_msg, ".") ? "." : "", + err_msg ? " " : ""); +} |