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01e6465b558570d2e33ebeb514b39cedde96014f
systemd/src/network/networkd-link.c
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/if_link.h>
#include <linux/netdevice.h>
#include <net/if.h>
#include <sys/socket.h>
#include <unistd.h>
#include "sd-bus.h"
#include "sd-dhcp-client.h"
#include "sd-dhcp-relay.h"
#include "sd-dhcp-server.h"
#include "sd-dhcp6-client.h"
#include "sd-dhcp6-lease.h"
#include "sd-ipv4ll.h"
#include "sd-lldp-rx.h"
#include "sd-ndisc.h"
#include "sd-netlink.h"
#include "sd-radv.h"
#include "sd-varlink.h"
#include "alloc-util.h"
#include "arphrd-util.h"
#include "bitfield.h"
#include "device-private.h"
#include "device-util.h"
#include "dns-domain.h"
#include "errno-util.h"
#include "ethtool-util.h"
#include "event-util.h"
#include "format-ifname.h"
#include "fs-util.h"
#include "glyph-util.h"
#include "logarithm.h"
#include "netif-util.h"
#include "netlink-util.h"
#include "networkd-address.h"
#include "networkd-address-label.h"
#include "networkd-bridge-fdb.h"
#include "networkd-bridge-mdb.h"
#include "networkd-bridge-vlan.h"
#include "networkd-dhcp-prefix-delegation.h"
#include "networkd-dhcp-relay.h"
#include "networkd-dhcp-server.h"
#include "networkd-dhcp4.h"
#include "networkd-dhcp6.h"
#include "networkd-ipv4acd.h"
#include "networkd-ipv4ll.h"
#include "networkd-ipv6-proxy-ndp.h"
#include "networkd-link.h"
#include "networkd-link-bus.h"
#include "networkd-lldp-tx.h"
#include "networkd-manager.h"
#include "networkd-ndisc.h"
#include "networkd-neighbor.h"
#include "networkd-nexthop.h"
#include "networkd-queue.h"
#include "networkd-radv.h"
#include "networkd-resolve-hook.h"
#include "networkd-route.h"
#include "networkd-route-util.h"
#include "networkd-routing-policy-rule.h"
#include "networkd-setlink.h"
#include "networkd-sriov.h"
#include "networkd-state-file.h"
#include "networkd-sysctl.h"
#include "networkd-wifi.h"
#include "networkd-wwan-bus.h"
#include "ordered-set.h"
#include "set.h"
#include "socket-util.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"
#include "tc.h"
#include "udev-util.h"
void link_required_operstate_for_online(Link *link, LinkOperationalStateRange *ret) {
assert(link);
assert(ret);
if (link->network && operational_state_range_is_valid(&link->network->required_operstate_for_online))
/* If explicitly specified, use it as is. */
*ret = link->network->required_operstate_for_online;
else if (link->iftype == ARPHRD_CAN)
/* CAN devices do not support addressing, hence defaults to 'carrier'. */
*ret = (const LinkOperationalStateRange) {
.min = LINK_OPERSTATE_CARRIER,
.max = LINK_OPERSTATE_CARRIER,
};
else if (link->network && link->network->bond)
/* Bonding slaves do not support addressing. */
*ret = (const LinkOperationalStateRange) {
.min = LINK_OPERSTATE_ENSLAVED,
.max = LINK_OPERSTATE_ENSLAVED,
};
else if (STRPTR_IN_SET(link->kind, "batadv", "bond", "bridge", "vrf"))
/* Some of slave interfaces may be offline. */
*ret = (const LinkOperationalStateRange) {
.min = LINK_OPERSTATE_DEGRADED_CARRIER,
.max = LINK_OPERSTATE_ROUTABLE,
};
else
*ret = LINK_OPERSTATE_RANGE_DEFAULT;
}
AddressFamily link_required_family_for_online(Link *link) {
assert(link);
if (link->network && link->network->required_family_for_online >= 0)
return link->network->required_family_for_online;
if (link->network && operational_state_range_is_valid(&link->network->required_operstate_for_online))
/* If RequiredForOnline= is explicitly specified, defaults to no. */
return ADDRESS_FAMILY_NO;
if (STRPTR_IN_SET(link->kind, "batadv", "bond", "bridge", "vrf"))
/* As the minimum required operstate for master interfaces is 'degraded-carrier',
* we should request an address assigned to the link for backward compatibility. */
return ADDRESS_FAMILY_YES;
return ADDRESS_FAMILY_NO;
}
bool link_ipv6_enabled(Link *link) {
assert(link);
if (!socket_ipv6_is_supported())
return false;
if (link->iftype == ARPHRD_CAN)
return false;
if (!link->network)
return false;
if (link->network->bond)
return false;
if (link_ipv6ll_enabled(link))
return true;
if (network_has_static_ipv6_configurations(link->network))
return true;
return false;
}
bool link_has_ipv6_connectivity(Link *link) {
LinkAddressState ipv6_address_state;
assert(link);
link_get_address_states(link, NULL, &ipv6_address_state, NULL);
switch (ipv6_address_state) {
case LINK_ADDRESS_STATE_ROUTABLE:
/* If the interface has a routable IPv6 address, then we assume yes. */
return true;
case LINK_ADDRESS_STATE_DEGRADED:
/* If the interface has only degraded IPv6 address (mostly, link-local address), then let's check
* there is an IPv6 default gateway. */
return link_has_default_gateway(link, AF_INET6);
case LINK_ADDRESS_STATE_OFF:
/* No IPv6 address. */
return false;
default:
assert_not_reached();
}
}
static bool link_is_ready_to_configure_one(Link *link, bool allow_unmanaged) {
assert(link);
if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
return false;
if (!link->network)
return allow_unmanaged;
if (!link->network->configure_without_carrier) {
if (link->set_flags_messages > 0)
return false;
if (!link_has_carrier(link))
return false;
}
if (link->set_link_messages > 0)
return false;
if (!link->activated)
return false;
return true;
}
bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
return check_ready_for_all_sr_iov_ports(link, allow_unmanaged, link_is_ready_to_configure_one);
}
bool link_is_ready_to_configure_by_name(Manager *manager, const char *name, bool allow_unmanaged) {
assert(manager);
assert(name);
Link *link;
if (link_get_by_name(manager, name, &link) < 0)
return false;
return link_is_ready_to_configure(link, allow_unmanaged);
}
void link_ntp_settings_clear(Link *link) {
link->ntp = strv_free(link->ntp);
}
void link_dns_settings_clear(Link *link) {
if (link->n_dns != UINT_MAX)
for (unsigned i = 0; i < link->n_dns; i++)
in_addr_full_free(link->dns[i]);
link->dns = mfree(link->dns);
link->n_dns = UINT_MAX;
link->search_domains = ordered_set_free(link->search_domains);
link->route_domains = ordered_set_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(link->dnssec_negative_trust_anchors);
}
static void link_free_engines(Link *link) {
if (!link)
return;
link->dhcp_relay_interface = sd_dhcp_relay_interface_unref(link->dhcp_relay_interface);
link->dhcp_relay_interface_compat = sd_dhcp_relay_interface_unref(link->dhcp_relay_interface_compat);
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->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name);
link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx);
link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
link->ipv4acd_by_address = hashmap_free(link->ipv4acd_by_address);
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->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire);
ndisc_flush(link);
link->radv = sd_radv_unref(link->radv);
}
static Link* link_free(Link *link) {
assert(link);
(void) link_clear_sysctl_shadows(link);
link_ntp_settings_clear(link);
link_dns_settings_clear(link);
link->neighbors = set_free(link->neighbors);
link->addresses = set_free(link->addresses);
link->qdiscs = set_free(link->qdiscs);
link->tclasses = set_free(link->tclasses);
link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
link_free_engines(link);
set_free(link->sr_iov_virt_port_ifindices);
free(link->ifname);
strv_free(link->alternative_names);
free(link->kind);
free(link->ssid);
free(link->previous_ssid);
free(link->driver);
unlink_and_free(link->state_file);
sd_device_unref(link->dev);
netdev_unref(link->netdev);
hashmap_free(link->bound_to_links);
hashmap_free(link->bound_by_links);
set_free(link->slaves);
network_unref(link->network);
sd_event_source_disable_unref(link->carrier_lost_timer);
sd_event_source_disable_unref(link->ipv6_mtu_wait_synced_event_source);
return mfree(link);
}
DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(
link_hash_ops,
void, trivial_hash_func, trivial_compare_func,
Link, link_unref);
int link_get_by_index(Manager *m, int ifindex, Link **ret) {
Link *link;
assert(m);
if (ifindex <= 0)
return -EINVAL;
link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
if (!link)
return -ENODEV;
if (ret)
*ret = link;
return 0;
}
int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
Link *link;
assert(m);
assert(ifname);
link = hashmap_get(m->links_by_name, ifname);
if (!link)
return -ENODEV;
if (ret)
*ret = link;
return 0;
}
int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
Link *link;
assert(m);
assert(hw_addr);
link = hashmap_get(m->links_by_hw_addr, hw_addr);
if (!link)
return -ENODEV;
if (ret)
*ret = link;
return 0;
}
int link_get_master(Link *link, Link **ret) {
assert(link);
assert(link->manager);
assert(ret);
if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
return -ENODEV;
return link_get_by_index(link->manager, link->master_ifindex, ret);
}
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");
link_dirty(link);
}
int link_stop_engines(Link *link, bool may_keep_dynamic) {
int r, ret = 0;
assert(link);
assert(link->manager);
assert(link->manager->event);
bool keep_dynamic =
may_keep_dynamic &&
link->network &&
(link->manager->state == MANAGER_RESTARTING ||
FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DYNAMIC_ON_STOP));
if (!keep_dynamic) {
r = sd_dhcp_client_stop(link->dhcp_client);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 client: %m"));
r = sd_ipv4ll_stop(link->ipv4ll);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 link-local: %m"));
r = sd_dhcp6_client_stop(link->dhcp6_client);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m"));
r = dhcp_pd_remove(link, /* only_marked= */ false);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not remove DHCPv6 PD addresses and routes: %m"));
r = ndisc_stop(link);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Discovery: %m"));
ndisc_flush(link);
}
r = sd_dhcp_relay_interface_stop(link->dhcp_relay_interface);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCP relay agent: %m"));
r = sd_dhcp_relay_interface_stop(link->dhcp_relay_interface_compat);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCP relay agent (compat): %m"));
r = sd_dhcp_server_stop(link->dhcp_server);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 server: %m"));
r = sd_lldp_rx_stop(link->lldp_rx);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Rx: %m"));
r = sd_lldp_tx_stop(link->lldp_tx);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Tx: %m"));
r = ipv4acd_stop(link);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 ACD client: %m"));
r = sd_radv_stop(link->radv);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Advertisement: %m"));
return ret;
}
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);
if (!ratelimit_below(&link->automatic_reconfigure_ratelimit)) {
log_link_warning(link, "The interface entered the failed state frequently, refusing to reconfigure it automatically.");
goto stop;
}
log_link_info(link, "Trying to reconfigure the interface.");
if (link_reconfigure(link, LINK_RECONFIGURE_UNCONDITIONALLY) > 0)
return;
stop:
(void) link_stop_engines(link, /* may_keep_dynamic= */ false);
}
void link_check_ready(Link *link) {
Address *a;
assert(link);
if (link->state == LINK_STATE_CONFIGURED)
return;
if (link->state != LINK_STATE_CONFIGURING)
return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
if (!link->network)
return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
if (!link->tc_configured)
return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
if (link->set_link_messages > 0)
return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
if (!link->activated)
return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
if (link->iftype == ARPHRD_CAN)
/* let's shortcut things for CAN which doesn't need most of checks below. */
goto ready;
if (!link->stacked_netdevs_created)
return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
if (!link->static_addresses_configured)
return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
if (!link->static_address_labels_configured)
return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
if (!link->static_bridge_fdb_configured)
return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
if (!link->static_bridge_mdb_configured)
return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
if (!link->static_ipv6_proxy_ndp_configured)
return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
if (!link->static_neighbors_configured)
return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
if (!link->static_nexthops_configured)
return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
if (!link->static_routes_configured)
return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
if (!link->static_routing_policy_rules_configured)
return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
if (!link->sr_iov_configured)
return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
if (!link->bearer_configured)
return (void) log_link_debug(link, "%s(): Bearer has not been applied.", __func__);
/* IPv6LL is assigned after the link gains its carrier. */
if (!link->network->configure_without_carrier &&
link_ipv6ll_enabled(link) &&
!in6_addr_is_set(&link->ipv6ll_address))
return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
/* All static addresses must be ready. */
bool has_static_address = false;
SET_FOREACH(a, link->addresses) {
if (!IN_SET(a->source, NETWORK_CONFIG_SOURCE_STATIC, NETWORK_CONFIG_SOURCE_MODEM_MANAGER))
continue;
if (!address_is_ready(a))
return (void) log_link_debug(link, "%s(): static address %s is not ready.", __func__,
IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
has_static_address = true;
}
/* If at least one static address is requested, do not request that dynamic addressing protocols are finished. */
if (has_static_address)
goto ready;
/* If no dynamic addressing protocol enabled, assume the interface is ready.
* Note, ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
if (!link_ipv4ll_enabled(link) && !link_dhcp4_enabled(link) &&
!link_dhcp6_enabled(link) && !link_dhcp_pd_is_enabled(link) &&
(link->network->configure_without_carrier || !link_ndisc_enabled(link)))
goto ready;
bool ipv4ll_ready =
link_ipv4ll_enabled(link) && link->ipv4ll_address_configured &&
link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_IPV4LL);
bool dhcp4_ready =
link_dhcp4_enabled(link) && link->dhcp4_configured &&
link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP4);
bool dhcp6_ready =
link_dhcp6_enabled(link) && link->dhcp6_configured &&
(!link->network->dhcp6_use_address ||
link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP6));
bool dhcp_pd_ready =
link_dhcp_pd_is_enabled(link) && link->dhcp_pd_configured &&
(!link->network->dhcp_pd_assign ||
link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP_PD));
bool ndisc_ready =
link_ndisc_enabled(link) && link->ndisc_configured &&
(!link->network->ndisc_use_autonomous_prefix ||
link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_NDISC));
/* If the uplink for PD is self, then request the corresponding DHCP protocol is also ready. */
if (dhcp_pd_is_uplink(link, link, /* accept_auto= */ false)) {
if (link_dhcp4_enabled(link) && link->network->dhcp_use_6rd &&
sd_dhcp_lease_has_6rd(link->dhcp_lease)) {
if (!link->dhcp4_configured)
return (void) log_link_debug(link, "%s(): DHCPv4 6rd prefix is assigned, but DHCPv4 protocol is not finished yet.", __func__);
if (!dhcp_pd_ready)
return (void) log_link_debug(link, "%s(): DHCPv4 is finished, but prefix acquired by DHCPv4-6rd is not assigned yet.", __func__);
}
if (link_dhcp6_enabled(link) && link->network->dhcp6_use_pd_prefix &&
sd_dhcp6_lease_has_pd_prefix(link->dhcp6_lease)) {
if (!link->dhcp6_configured)
return (void) log_link_debug(link, "%s(): DHCPv6 IA_PD prefix is assigned, but DHCPv6 protocol is not finished yet.", __func__);
if (!dhcp_pd_ready)
return (void) log_link_debug(link, "%s(): DHCPv6 is finished, but prefix acquired by DHCPv6 IA_PD is not assigned yet.", __func__);
}
}
/* At least one dynamic addressing protocol is finished. */
if (!ipv4ll_ready && !dhcp4_ready && !dhcp6_ready && !dhcp_pd_ready && !ndisc_ready)
return (void) log_link_debug(link, "%s(): dynamic addressing protocols are enabled but none of them finished yet.", __func__);
log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
__func__,
yes_no(ipv4ll_ready),
yes_no(dhcp4_ready),
yes_no(dhcp6_ready),
yes_no(dhcp_pd_ready),
yes_no(ndisc_ready));
ready:
link_set_state(link, LINK_STATE_CONFIGURED);
}
static int link_request_static_configs(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->state != _LINK_STATE_INVALID);
r = link_request_static_addresses(link);
if (r < 0)
return r;
r = link_request_static_address_labels(link);
if (r < 0)
return r;
r = link_request_static_bridge_fdb(link);
if (r < 0)
return r;
r = link_request_static_bridge_mdb(link);
if (r < 0)
return r;
r = link_request_static_ipv6_proxy_ndp_addresses(link);
if (r < 0)
return r;
r = link_request_static_neighbors(link);
if (r < 0)
return r;
r = link_request_static_nexthops(link, false);
if (r < 0)
return r;
r = link_request_static_routes(link, false);
if (r < 0)
return r;
r = link_request_static_routing_policy_rules(link);
if (r < 0)
return r;
return 0;
}
int link_request_stacked_netdevs(Link *link, NetDevLocalAddressType type) {
NetDev *netdev;
int r;
assert(link);
if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
return 0;
assert(link->network);
link->stacked_netdevs_created = false;
HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
if (!netdev_needs_reconfigure(netdev, type))
continue;
r = link_request_stacked_netdev(link, netdev);
if (r < 0)
return r;
}
if (link->create_stacked_netdev_messages == 0) {
link->stacked_netdevs_created = true;
link_check_ready(link);
}
return 0;
}
static int link_acquire_dynamic_ipv6_conf(Link *link) {
int r;
assert(link);
r = radv_start(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
r = ndisc_start(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
r = dhcp6_start(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
return 0;
}
static int link_acquire_dynamic_ipv4_conf(Link *link) {
int r;
assert(link);
assert(link->manager);
assert(link->manager->event);
if (link->dhcp_client) {
r = dhcp4_start(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
log_link_debug(link, "Acquiring DHCPv4 lease.");
} else if (link->ipv4ll) {
if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
if (r < 0)
return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
}
r = ipv4ll_start(link);
if (r < 0)
return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
if (r > 0)
log_link_debug(link, "Acquiring IPv4 link-local address.");
}
r = link_start_dhcp_relay(link);
if (r < 0)
return log_link_warning_errno(link, r, "Could not start DHCP relay agent: %m");
r = link_start_dhcp4_server(link);
if (r < 0)
return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
r = ipv4acd_start(link);
if (r < 0)
return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
return 0;
}
static int link_acquire_dynamic_conf(Link *link) {
int r;
assert(link);
assert(link->network);
r = link_acquire_dynamic_ipv4_conf(link);
if (r < 0)
return r;
if (in6_addr_is_set(&link->ipv6ll_address)) {
r = link_acquire_dynamic_ipv6_conf(link);
if (r < 0)
return r;
}
if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
/* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
* configured, and RADV may not be configured yet here. Only acquire subnet prefix when
* RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
* below will be called in radv_start(). */
r = dhcp_request_prefix_delegation(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
}
if (link->lldp_tx) {
r = sd_lldp_tx_start(link->lldp_tx);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
}
if (link->lldp_rx) {
r = sd_lldp_rx_start(link->lldp_rx);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
}
return 0;
}
int link_ipv6ll_gained(Link *link) {
int r;
assert(link);
log_link_info(link, "Gained IPv6LL");
if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
return 0;
r = link_acquire_dynamic_ipv6_conf(link);
if (r < 0)
return r;
r = link_request_stacked_netdevs(link, NETDEV_LOCAL_ADDRESS_IPV6LL);
if (r < 0)
return r;
link_check_ready(link);
return 0;
}
int link_ipv6ll_lost(Link *link, const struct in6_addr *dropped_ipv6ll, bool has_replacement) {
int ret = 0, r;
assert(link);
assert(dropped_ipv6ll);
if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
return 0;
log_link_info(link, "Lost IPv6LL address %s%s.",
IN6_ADDR_TO_STRING(dropped_ipv6ll),
has_replacement ? ", switching to alternate IPv6LL source" : "");
r = sd_dhcp6_client_stop(link->dhcp6_client);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m"));
/* DHCPv6 must be restarted to switch the client's source address, while NDisc and
* RADV can switch to the replacement IPv6LL in link_ipv6ll_gained() without flushing
* learned state. Keep link->ndisc_configured as-is in this path. */
if (has_replacement)
return ret;
r = ndisc_stop(link);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Discovery: %m"));
link->ndisc_configured = false;
ndisc_flush(link);
r = sd_radv_stop(link->radv);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Advertisement: %m"));
r = link_request_stacked_netdevs(link, NETDEV_LOCAL_ADDRESS_IPV6LL);
if (r < 0)
RET_GATHER(ret, log_link_warning_errno(link, r, "Could not reconfigure stacked netdevs after IPv6LL loss: %m"));
return ret;
}
int link_handle_bound_to_list(Link *link) {
bool required_up = false;
Link *l;
assert(link);
/* If at least one interface in bound_to_links has carrier, then make this interface up.
* If all interfaces in bound_to_links do not, then make this interface down. */
if (hashmap_isempty(link->bound_to_links))
return 0;
HASHMAP_FOREACH(l, link->bound_to_links)
if (link_has_carrier(l)) {
required_up = true;
break;
}
if (!required_up && link_is_up(link))
return link_request_to_bring_up_or_down(link, /* up= */ false);
if (required_up && !link_is_up(link))
return link_request_to_bring_up_or_down(link, /* up= */ true);
return 0;
}
static int link_handle_bound_by_list(Link *link) {
Link *l;
int r;
assert(link);
/* Update up or down state of interfaces which depend on this interface's carrier state. */
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);
assert(h);
if (link == carrier)
return 0;
if (hashmap_contains(*h, INT_TO_PTR(carrier->ifindex)))
return 0;
r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
if (r < 0)
return r;
link_dirty(link);
return 0;
}
static int link_new_bound_by_list(Link *link) {
Manager *m;
Link *carrier;
int r;
assert(link);
assert(link->manager);
m = link->manager;
HASHMAP_FOREACH(carrier, m->links_by_index) {
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;
}
}
HASHMAP_FOREACH(carrier, link->bound_by_links) {
r = link_put_carrier(carrier, link, &carrier->bound_to_links);
if (r < 0)
return r;
}
return 0;
}
static int link_new_bound_to_list(Link *link) {
Manager *m;
Link *carrier;
int r;
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_by_index) {
if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
r = link_put_carrier(link, carrier, &link->bound_to_links);
if (r < 0)
return r;
}
}
HASHMAP_FOREACH(carrier, link->bound_to_links) {
r = link_put_carrier(carrier, link, &carrier->bound_by_links);
if (r < 0)
return r;
}
return 0;
}
static void link_free_bound_to_list(Link *link) {
bool updated = false;
Link *bound_to;
assert(link);
while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
updated = true;
if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
link_dirty(bound_to);
}
if (updated)
link_dirty(link);
}
static void link_free_bound_by_list(Link *link) {
bool updated = false;
Link *bound_by;
assert(link);
while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
updated = true;
if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
link_dirty(bound_by);
link_handle_bound_to_list(bound_by);
}
}
if (updated)
link_dirty(link);
}
static int link_append_to_master(Link *link) {
Link *master;
int r;
assert(link);
/* - The link may have no master.
* - RTM_NEWLINK message about master interface may not be received yet. */
if (link_get_master(link, &master) < 0)
return 0;
r = set_ensure_put(&master->slaves, &link_hash_ops, link);
if (r <= 0)
return r;
link_ref(link);
return 0;
}
static void link_drop_from_master(Link *link) {
Link *master;
assert(link);
if (!link->manager)
return;
if (link_get_master(link, &master) < 0)
return;
link_unref(set_remove(master->slaves, link));
}
static int link_drop_requests(Link *link) {
Request *req;
int ret = 0;
assert(link);
assert(link->manager);
ORDERED_SET_FOREACH(req, link->manager->request_queue) {
if (req->link != link)
continue;
/* If the request is already called, but its reply is not received, then we need to
* drop the configuration (e.g. address) here. Note, if the configuration is known,
* it will be handled later by link_drop_unmanaged_addresses() or so. */
if (req->waiting_reply && link->state != LINK_STATE_LINGER)
switch (req->type) {
case REQUEST_TYPE_ADDRESS: {
Address *address = ASSERT_PTR(req->userdata);
if (address_get(link, address, NULL) < 0)
RET_GATHER(ret, address_remove(address, link));
break;
}
case REQUEST_TYPE_NEIGHBOR: {
Neighbor *neighbor = ASSERT_PTR(req->userdata);
if (neighbor_get(link, neighbor, NULL) < 0)
RET_GATHER(ret, neighbor_remove(neighbor, link));
break;
}
case REQUEST_TYPE_NEXTHOP: {
NextHop *nexthop = ASSERT_PTR(req->userdata);
if (nexthop_get_by_id(link->manager, nexthop->id, NULL) < 0)
RET_GATHER(ret, nexthop_remove(nexthop, link->manager));
break;
}
case REQUEST_TYPE_ROUTE: {
Route *route = ASSERT_PTR(req->userdata);
if (route_get(link->manager, route, NULL) < 0)
RET_GATHER(ret, route_remove(route, link->manager));
break;
}
default:
;
}
request_detach(req);
}
return ret;
}
static Link *link_drop(Link *link) {
if (!link)
return NULL;
assert(link->manager);
bool notify = link_has_local_lease_domain(link);
link_set_state(link, LINK_STATE_LINGER);
/* Drop all references from other links and manager. Note that async netlink calls may have
* references to the link, and they will be dropped when we receive replies. */
(void) link_drop_requests(link);
link_free_bound_to_list(link);
link_free_bound_by_list(link);
link_clear_sr_iov_ifindices(link);
link_drop_from_master(link);
if (link->state_file)
(void) unlink(link->state_file);
link_clean(link);
STRV_FOREACH(n, link->alternative_names)
hashmap_remove(link->manager->links_by_name, *n);
hashmap_remove(link->manager->links_by_name, link->ifname);
/* bonding master and its slaves have the same hardware address. */
hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
/* The following must be called at last. */
assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
if (notify)
manager_notify_hook_filters(link->manager);
return link_unref(link);
}
static int link_drop_unmanaged_config(Link *link) {
int r;
assert(link);
assert(link->state == LINK_STATE_CONFIGURING);
assert(link->manager);
r = link_drop_unmanaged_routes(link);
RET_GATHER(r, link_drop_unmanaged_nexthops(link));
RET_GATHER(r, link_drop_unmanaged_addresses(link));
RET_GATHER(r, link_drop_unmanaged_neighbors(link));
RET_GATHER(r, link_drop_unmanaged_routing_policy_rules(link));
return r;
}
static int link_drop_static_config(Link *link) {
int r;
assert(link);
assert(link->manager);
r = link_drop_static_routes(link);
RET_GATHER(r, link_drop_static_nexthops(link));
RET_GATHER(r, link_drop_static_addresses(link));
RET_GATHER(r, link_drop_static_neighbors(link));
RET_GATHER(r, link_drop_static_routing_policy_rules(link));
return r;
}
static int link_drop_dynamic_config(Link *link, Network *network) {
int r;
assert(link);
assert(link->network);
/* Drop unnecessary dynamic configurations gracefully, e.g. drop DHCP lease in the case that
* previously DHCP=yes and now DHCP=no, but keep DHCP lease when DHCP setting is unchanged. */
r = link_drop_ndisc_config(link, network);
RET_GATHER(r, link_drop_radv_config(link, network)); /* Stop before dropping DHCP-PD prefixes. */
RET_GATHER(r, link_drop_ipv4ll_config(link, network)); /* Stop before DHCPv4 client. */
RET_GATHER(r, link_drop_dhcp4_config(link, network));
RET_GATHER(r, link_drop_dhcp6_config(link, network));
RET_GATHER(r, link_drop_dhcp_pd_config(link, network));
link->dhcp_relay_interface = sd_dhcp_relay_interface_unref(link->dhcp_relay_interface);
link->dhcp_relay_interface_compat = sd_dhcp_relay_interface_unref(link->dhcp_relay_interface_compat);
link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx); /* TODO: keep the received neighbors. */
link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
/* Even if we do not release DHCP lease or so, reset 'configured' flags. Otherwise, e.g. if
* previously UseDNS= was disabled but is now enabled, link will enter configured state before
* expected DNS servers being acquired. */
link->ipv4ll_address_configured = false;
link->dhcp4_configured = false;
link->dhcp6_configured = false;
link->dhcp_pd_configured = false;
link->ndisc_configured = false;
return r;
}
static int link_configure(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_INITIALIZED);
link_set_state(link, LINK_STATE_CONFIGURING);
r = link_drop_unmanaged_config(link);
if (r < 0)
return r;
r = link_new_bound_to_list(link);
if (r < 0)
return r;
r = link_request_traffic_control(link);
if (r < 0)
return r;
r = link_configure_mtu(link);
if (r < 0)
return r;
if (link->iftype == ARPHRD_CAN) {
/* let's shortcut things for CAN which doesn't need most of what's done below. */
r = link_request_to_set_can(link);
if (r < 0)
return r;
return link_request_to_activate(link);
}
r = link_request_sr_iov_vfs(link);
if (r < 0)
return r;
r = link_set_sysctl(link);
if (r < 0)
return r;
r = link_request_to_set_mac(link, /* allow_retry= */ true);
if (r < 0)
return r;
r = link_request_to_set_ipoib(link);
if (r < 0)
return r;
r = link_request_to_set_flags(link);
if (r < 0)
return r;
r = link_request_to_set_group(link);
if (r < 0)
return r;
r = link_request_to_set_addrgen_mode(link);
if (r < 0)
return r;
r = link_request_to_set_master(link);
if (r < 0)
return r;
r = link_request_stacked_netdevs(link, _NETDEV_LOCAL_ADDRESS_TYPE_INVALID);
if (r < 0)
return r;
r = link_request_to_set_bond(link);
if (r < 0)
return r;
r = link_request_to_set_bridge(link);
if (r < 0)
return r;
r = link_request_to_set_bridge_vlan(link);
if (r < 0)
return r;
r = link_request_to_activate(link);
if (r < 0)
return r;
r = ipv4ll_configure(link);
if (r < 0)
return r;
r = link_request_dhcp4_client(link);
if (r < 0)
return r;
r = link_request_dhcp6_client(link);
if (r < 0)
return r;
r = link_request_ndisc(link);
if (r < 0)
return r;
r = link_request_dhcp_relay(link);
if (r < 0)
return r;
r = link_request_dhcp_server(link);
if (r < 0)
return r;
r = link_request_radv(link);
if (r < 0)
return r;
r = link_lldp_rx_configure(link);
if (r < 0)
return r;
r = link_lldp_tx_configure(link);
if (r < 0)
return r;
r = link_request_static_configs(link);
if (r < 0)
return r;
r = link_modem_reconfigure(link);
if (r < 0)
return r;
if (!link_has_carrier(link))
return 0;
return link_acquire_dynamic_conf(link);
}
static int link_get_network(Link *link, Network **ret) {
Network *network;
int r;
assert(link);
assert(link->manager);
assert(ret);
ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
bool warn = false;
r = net_match_config(
&network->match,
link->dev,
&link->hw_addr,
&link->permanent_hw_addr,
link->driver,
link->iftype,
link->kind,
link->ifname,
link->alternative_names,
link->wlan_iftype,
link->ssid,
&link->bssid);
if (r < 0)
return r;
if (r == 0)
continue;
if (network->match.ifname && link->dev) {
uint8_t name_assign_type;
if (device_get_sysattr_u8(link->dev, "name_assign_type", &name_assign_type) >= 0)
warn = name_assign_type == NET_NAME_ENUM;
}
log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
"Found matching .network file%s: %s",
warn ? ", based on potentially unpredictable interface name" : "",
network->filename);
if (network->unmanaged)
return -ENOENT;
*ret = network;
return 0;
}
return log_link_debug_errno(link, SYNTHETIC_ERRNO(ENOENT), "No matching .network found.");
}
static void link_enter_unmanaged(Link *link) {
assert(link);
if (link->state == LINK_STATE_UNMANAGED)
return;
bool notify = link_has_local_lease_domain(link);
log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
"Unmanaging interface.");
(void) link_stop_engines(link, /* may_keep_dynamic= */ false);
(void) link_drop_requests(link);
(void) link_drop_static_config(link);
/* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
* bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
* not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
* map here, as it depends on .network files assigned to other links. */
link_free_bound_to_list(link);
link_free_engines(link);
link->network = network_unref(link->network);
link_set_state(link, LINK_STATE_UNMANAGED);
if (notify)
manager_notify_hook_filters(link->manager);
}
static int link_managed_by_us(Link *link) {
int r;
assert(link);
if (!link->dev)
return true;
const char *s;
r = sd_device_get_property_value(link->dev, "ID_NET_MANAGED_BY", &s);
if (r == -ENOENT)
return true;
if (r < 0)
return log_link_warning_errno(link, r, "Failed to get ID_NET_MANAGED_BY udev property: %m");
if (streq(s, "io.systemd.Network"))
return true;
if (link->state == LINK_STATE_UNMANAGED)
return false; /* Already in unmanaged state */
log_link_debug(link, "Interface is requested to be managed by '%s', unmanaging the interface.", s);
link_set_state(link, LINK_STATE_UNMANAGED);
return false;
}
int link_reconfigure_impl(Link *link, LinkReconfigurationFlag flags) {
Network *network = NULL;
int r;
assert(link);
assert(link->manager);
link_assign_netdev(link);
if (link->manager->state != MANAGER_RUNNING)
return 0;
if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
return 0;
r = link_managed_by_us(link);
if (r <= 0)
return r;
r = link_get_network(link, &network);
if (r == -ENOENT) {
link_enter_unmanaged(link);
return 0;
}
if (r < 0)
return r;
if (link->network == network && !FLAGS_SET(flags, LINK_RECONFIGURE_UNCONDITIONALLY))
return 0;
_cleanup_free_ char *joined = strv_join(network->dropins, ", ");
if (link->network)
log_link_info(link, "Reconfiguring with %s%s%s%s.",
network->filename,
isempty(joined) ? "" : " (dropins: ",
joined,
isempty(joined) ? "" : ")");
else
log_link_info(link, "Configuring with %s%s%s%s.",
network->filename,
isempty(joined) ? "" : " (dropins: ",
joined,
isempty(joined) ? "" : ")");
/* Dropping configurations based on the old .network file. */
r = link_drop_requests(link);
if (r < 0)
return r;
/* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
* bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
* not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
* map here, as it depends on .network files assigned to other links. */
link_free_bound_to_list(link);
_cleanup_(network_unrefp) Network *old_network = TAKE_PTR(link->network);
/* Then, apply new .network file */
link->network = network_ref(network);
if (FLAGS_SET(network->keep_configuration, KEEP_CONFIGURATION_DYNAMIC) ||
!FLAGS_SET(flags, LINK_RECONFIGURE_CLEANLY)) {
/* To make 'networkctl reconfigure INTERFACE' work safely for an interface whose new .network
* file has KeepConfiguration=dynamic or yes, even if a clean reconfiguration is requested,
* drop only unnecessary or possibly being changed dynamic configurations here. */
r = link_drop_dynamic_config(link, old_network);
if (r < 0)
return r;
} else {
/* Otherwise, stop DHCP client and friends unconditionally, and drop all dynamic
* configurations like DHCP address and routes. */
r = link_stop_engines(link, /* may_keep_dynamic= */ false);
if (r < 0)
return r;
/* Free DHCP client and friends. */
link_free_engines(link);
}
link_update_operstate(link, true);
link_dirty(link);
link_set_state(link, LINK_STATE_INITIALIZED);
link->activated = false;
r = link_configure(link);
if (r < 0)
return r;
return 1;
}
typedef struct LinkReconfigurationData {
Manager *manager;
Link *link;
LinkReconfigurationFlag flags;
sd_bus_message *message;
sd_varlink *varlink;
unsigned *counter;
} LinkReconfigurationData;
static LinkReconfigurationData* link_reconfiguration_data_free(LinkReconfigurationData *data) {
if (!data)
return NULL;
link_unref(data->link);
sd_bus_message_unref(data->message);
sd_varlink_unref(data->varlink);
return mfree(data);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(LinkReconfigurationData*, link_reconfiguration_data_free);
static void link_reconfiguration_data_destroy_callback(LinkReconfigurationData *data) {
int r;
assert(data);
assert(!data->message || !data->varlink); /* D-Bus and Varlink callers are mutually exclusive */
if (data->counter) {
assert(*data->counter > 0);
(*data->counter)--;
}
if (!data->counter || *data->counter == 0) {
/* Update the state files before replying. Otherwise, systemd-networkd-wait-online following
* networkctl reload/reconfigure may read an outdated state file and wrongly consider an
* interface already in the configured state. */
(void) manager_clean_all(data->manager);
if (data->message) {
r = sd_bus_reply_method_return(data->message, NULL);
if (r < 0)
log_warning_errno(r, "Failed to reply for DBus method, ignoring: %m");
}
if (data->varlink) {
r = sd_varlink_reply(data->varlink, NULL);
if (r < 0)
log_warning_errno(r, "Failed to reply to Varlink request, ignoring: %m");
}
}
link_reconfiguration_data_free(data);
}
static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, LinkReconfigurationData *data) {
Link *link = ASSERT_PTR(ASSERT_PTR(data)->link);
int r;
r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
if (r <= 0)
return r;
r = link_reconfigure_impl(link, data->flags);
if (r < 0) {
link_enter_failed(link);
return 0;
}
return r;
}
int link_reconfigure_full(Link *link, LinkReconfigurationFlag flags, sd_bus_message *message, sd_varlink *varlink, unsigned *counter) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
_cleanup_(link_reconfiguration_data_freep) LinkReconfigurationData *data = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
assert(!message || !varlink); /* D-Bus and Varlink callers are mutually exclusive */
/* When the link is in the pending or initialized state, link_reconfigure_impl() will be called later
* by link_initialized() or link_initialized_and_synced(). To prevent the function from being called
* multiple times simultaneously, let's refuse to reconfigure the interface here in such cases. */
if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
return 0; /* 0 means no-op. */
data = new(LinkReconfigurationData, 1);
if (!data) {
r = -ENOMEM;
goto failed;
}
*data = (LinkReconfigurationData) {
.manager = link->manager,
.link = link_ref(link),
.flags = flags,
.message = sd_bus_message_ref(message), /* message may be NULL, but _ref() works fine. */
.varlink = sd_varlink_ref(varlink), /* varlink may be NULL, but _ref() works fine. */
.counter = counter,
};
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
if (r < 0)
goto failed;
r = netlink_call_async(link->manager->rtnl, NULL, req,
link_reconfigure_handler,
link_reconfiguration_data_destroy_callback, data);
if (r < 0)
goto failed;
TAKE_PTR(data);
if (counter)
(*counter)++;
if (link->state == LINK_STATE_FAILED)
link_set_state(link, LINK_STATE_INITIALIZED);
return 1; /* 1 means the interface will be reconfigured, and bus method will be replied later. */
failed:
log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
link_enter_failed(link);
return r;
}
static int link_initialized_and_synced(Link *link) {
int r;
assert(link);
assert(link->manager);
if (link->state == LINK_STATE_PENDING) {
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;
}
return link_reconfigure_impl(link, /* flags= */ 0);
}
static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
if (r <= 0)
return r;
r = link_initialized_and_synced(link);
if (r < 0)
link_enter_failed(link);
return 0;
}
static int link_initialized(Link *link, sd_device *device) {
int r;
assert(link);
assert(device);
/* Always replace with the new sd_device object. As the sysname (and possibly other properties
* or sysattrs) may be outdated. */
device_unref_and_replace_new_ref(link->dev, device);
r = link_managed_by_us(link);
if (r <= 0)
return r;
if (link->dhcp_client) {
r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
if (r < 0)
log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
}
if (link->dhcp6_client) {
r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
if (r < 0)
log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
}
r = link_set_sr_iov_ifindices(link);
if (r < 0)
log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
if (link->state != LINK_STATE_PENDING)
return link_reconfigure(link, /* flags= */ 0);
log_link_debug(link, "udev initialized link");
/* 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 */
return link_call_getlink(link, link_initialized_handler);
}
int link_check_initialized(Link *link) {
_cleanup_(sd_device_unrefp) sd_device *device = NULL;
int r;
assert(link);
if (!udev_available())
return link_initialized_and_synced(link);
/* udev should be around */
r = sd_device_new_from_ifindex(&device, link->ifindex);
if (r < 0) {
log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
return 0;
}
r = device_is_processed(device);
if (r < 0)
return log_link_warning_errno(link, r, "Could not determine whether the device is processed by udevd: %m");
if (r == 0) {
/* not yet ready */
log_link_debug(link, "link pending udev initialization...");
return 0;
}
r = device_is_renaming(device);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
if (r > 0) {
log_link_debug(link, "Interface is being renamed, pending initialization.");
return 0;
}
return link_initialized(link, device);
}
int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
int r, ifindex;
Link *link;
assert(m);
assert(device);
r = sd_device_get_ifindex(device, &ifindex);
if (r < 0)
return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
r = link_get_by_index(m, ifindex, &link);
if (r < 0) {
/* This error is not critical, as the corresponding rtnl message may be received later. */
log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
return 0;
}
/* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
* object here. It will be removed only when rtnetlink says so. */
if (action == SD_DEVICE_REMOVE) {
link->dev = sd_device_unref(link->dev);
return 0;
}
r = device_is_renaming(device);
if (r < 0)
return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
if (r > 0) {
log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
/* TODO:
* What happens when a device is initialized, then soon renamed after that? When we detect
* such, maybe we should cancel or postpone all queued requests for the interface. */
return 0;
}
r = link_initialized(link, device);
if (r < 0)
link_enter_failed(link);
return 0;
}
static int link_carrier_gained(Link *link) {
LinkReconfigurationFlag flags = 0;
int r;
assert(link);
log_link_info(link, "Gained carrier");
r = event_source_disable(link->carrier_lost_timer);
if (r < 0)
log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
/* Process BindCarrier= setting specified by other interfaces. This is independent of the .network
* file assigned to this interface, but depends on .network files assigned to other interfaces.
* Hence, this can and should be called earlier. */
r = link_handle_bound_by_list(link);
if (r < 0)
return r;
/* If a wireless interface was connected to an access point, and the SSID is changed (that is,
* both previous_ssid and ssid are non-NULL), then the connected wireless network could be
* changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
* restarted, and the correct network information will be gained.
*
* However, do not reconfigure the wireless interface forcibly if it was not connected to any
* access points previously (previous_ssid is NULL in this case). As, a .network file may be
* already assigned to the interface (in that case, the .network file does not have the SSID=
* setting in the [Match] section), and the interface is already being configured. Of course,
* there may exist another .network file with higher priority and a matching SSID= setting. But
* in that case, link_reconfigure_impl() can handle that without any flags.
*
* For non-wireless interfaces, we have no way to detect the connected network change. So,
* we do not set any flags here. Note, both ssid and previous_ssid are NULL in that case. */
if (link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid))
flags |= LINK_RECONFIGURE_UNCONDITIONALLY | LINK_RECONFIGURE_CLEANLY;
link->previous_ssid = mfree(link->previous_ssid);
/* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
* profile wants to match on it with SSID= in its [Match] section.
*/
if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
r = link_get_wlan_interface(link);
if (r < 0)
return r;
}
/* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
* call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
* link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
r = link_reconfigure_impl(link, flags);
if (r != 0)
return r;
if (link->iftype == ARPHRD_CAN)
/* let's shortcut things for CAN which doesn't need most of what's done below. */
return 0;
if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
r = link_acquire_dynamic_conf(link);
if (r < 0)
return r;
r = link_request_static_configs(link);
if (r < 0)
return r;
}
return 0;
}
static int link_carrier_lost_impl(Link *link) {
int ret = 0;
assert(link);
link->previous_ssid = mfree(link->previous_ssid);
ret = link_handle_bound_by_list(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return ret;
if (!link->network)
return ret;
RET_GATHER(ret, link_stop_engines(link, /* may_keep_dynamic= */ false));
RET_GATHER(ret, link_drop_static_config(link));
return ret;
}
static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
Link *link = ASSERT_PTR(userdata);
int r;
r = link_carrier_lost_impl(link);
if (r < 0) {
log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
link_enter_failed(link);
}
return 0;
}
static int link_carrier_lost(Link *link) {
uint16_t dhcp_mtu;
usec_t usec;
assert(link);
log_link_info(link, "Lost carrier");
if (link->iftype == ARPHRD_CAN)
/* let's shortcut things for CAN which doesn't need most of what's done below. */
usec = 0;
else if (!link->network)
usec = 0;
else if (link->network->ignore_carrier_loss_set)
/* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
usec = link->network->ignore_carrier_loss_usec;
else if (link->network->bond && link->wlan_iftype > 0)
/* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
* carrier to be lost. See #19832. */
usec = 3 * USEC_PER_SEC;
else if (link->network->dhcp_use_mtu &&
link->dhcp_lease &&
sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
dhcp_mtu != link->original_mtu)
/* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
* MTU should not cause any issues, as MTU is changed only once. However, setting MTU
* through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
usec = 5 * USEC_PER_SEC;
else
/* Otherwise, use the implied default value. */
usec = link->network->ignore_carrier_loss_usec;
if (usec == USEC_INFINITY)
return 0;
if (usec == 0)
return link_carrier_lost_impl(link);
return event_reset_time_relative(link->manager->event,
&link->carrier_lost_timer,
CLOCK_BOOTTIME,
usec,
0,
link_carrier_lost_handler,
link,
0,
"link-carrier-loss",
true);
}
static int link_admin_state_up(Link *link) {
assert(link);
/* This is called every time an interface admin state changes to up;
* specifically, when IFF_UP flag changes from unset to set. */
log_link_info(link, "Link UP");
if (!link->network)
return 0;
if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
return link_request_to_bring_up_or_down(link, /* up= */ false);
}
/* We set the ipv6 mtu after the device mtu, but the kernel resets
* ipv6 mtu on NETDEV_UP, so we need to reset it. */
(void) link_set_ipv6_mtu(link, LOG_INFO);
return 0;
}
static int link_admin_state_down(Link *link) {
assert(link);
log_link_info(link, "Link DOWN");
link_forget_nexthops(link);
link_forget_routes(link);
if (!link->network)
return 0;
if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
return link_request_to_bring_up_or_down(link, /* up= */ true);
}
return 0;
}
static bool link_is_enslaved(Link *link) {
if (link->flags & IFF_SLAVE)
return true;
if (link->master_ifindex > 0)
return true;
return false;
}
void link_update_operstate(Link *link, bool also_update_master) {
LinkOperationalState operstate;
LinkCarrierState carrier_state;
LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
LinkOnlineState online_state;
_cleanup_strv_free_ char **p = NULL;
bool changed = false;
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_is_up(link))
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;
}
}
link_get_address_states(link, &ipv4_address_state, &ipv6_address_state, &address_state);
/* 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 | degraded | enslaved
* routable | off | no-carrier | dormant | routable | routable | routable
*/
if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE)
operstate = LINK_OPERSTATE_ROUTABLE;
else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED)
operstate = LINK_OPERSTATE_DEGRADED;
else 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;
LinkOperationalStateRange req;
link_required_operstate_for_online(link, &req);
/* Only determine online state for managed links with RequiredForOnline=yes */
if (!link->network || !link->network->required_for_online)
online_state = _LINK_ONLINE_STATE_INVALID;
else if (!operational_state_is_in_range(operstate, &req))
online_state = LINK_ONLINE_STATE_OFFLINE;
else {
AddressFamily required_family = link_required_family_for_online(link);
bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
/* The operational state is within the range required for online.
* If a particular address family is also required, we might revert
* to offline in the blocks below. */
online_state = LINK_ONLINE_STATE_ONLINE;
if (req.min >= LINK_OPERSTATE_DEGRADED) {
if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
online_state = LINK_ONLINE_STATE_OFFLINE;
if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
online_state = LINK_ONLINE_STATE_OFFLINE;
}
if (req.min >= LINK_OPERSTATE_ROUTABLE) {
if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
online_state = LINK_ONLINE_STATE_OFFLINE;
if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
online_state = LINK_ONLINE_STATE_OFFLINE;
}
}
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->ipv4_address_state != ipv4_address_state) {
link->ipv4_address_state = ipv4_address_state;
changed = true;
if (strv_extend(&p, "IPv4AddressState") < 0)
log_oom();
}
if (link->ipv6_address_state != ipv6_address_state) {
link->ipv6_address_state = ipv6_address_state;
changed = true;
if (strv_extend(&p, "IPv6AddressState") < 0)
log_oom();
}
if (link->operstate != operstate) {
link->operstate = operstate;
changed = true;
if (strv_extend(&p, "OperationalState") < 0)
log_oom();
}
if (link->online_state != online_state) {
link->online_state = online_state;
changed = true;
if (strv_extend(&p, "OnlineState") < 0)
log_oom();
}
if (p)
link_send_changed_strv(link, p);
if (changed)
link_dirty(link);
if (also_update_master) {
Link *master;
if (link_get_master(link, &master) >= 0)
link_update_operstate(master, true);
}
}
bool link_has_carrier(Link *link) {
assert(link);
return netif_has_carrier(link->kernel_operstate, link->flags);
}
bool link_is_up(Link *link) {
assert(link);
return FLAGS_SET(link->flags, IFF_UP);
}
bool link_multicast_enabled(Link *link) {
assert(link);
/* If Multicast= is specified, use the value. */
if (link->network && link->network->multicast >= 0)
return link->network->multicast;
/* Otherwise, return the current state. */
return FLAGS_SET(link->flags, IFF_MULTICAST);
}
#define FLAG_STRING(string, flag, old, new) \
(((old ^ new) & flag) \
? ((old & flag) ? (" -" string) : (" +" string)) \
: "")
static int link_update_flags(Link *link, sd_netlink_message *message) {
bool link_was_admin_up, had_carrier;
uint8_t operstate;
unsigned flags;
int r;
assert(link);
assert(message);
r = sd_rtnl_message_link_get_flags(message, &flags);
if (r < 0)
return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
if (r == -ENODATA)
/* If we got a message without operstate, assume the state was unchanged. */
operstate = link->kernel_operstate;
else if (r < 0)
return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
if (link->flags == flags && link->kernel_operstate == operstate)
return 0;
if (link->flags != flags) {
unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
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);
if (unknown_flags_added)
log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
if (unknown_flags_removed)
log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
}
link_was_admin_up = link_is_up(link);
had_carrier = link_has_carrier(link);
link->flags = flags;
link->kernel_operstate = operstate;
link_update_operstate(link, true);
r = 0;
if (!link_was_admin_up && link_is_up(link))
r = link_admin_state_up(link);
else if (link_was_admin_up && !link_is_up(link))
r = link_admin_state_down(link);
if (r < 0)
return r;
if (!had_carrier && link_has_carrier(link))
r = link_carrier_gained(link);
else if (had_carrier && !link_has_carrier(link))
r = link_carrier_lost(link);
if (r < 0)
return r;
return 0;
}
static int link_update_master(Link *link, sd_netlink_message *message) {
int master_ifindex, r;
assert(link);
assert(message);
r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
if (r == -ENODATA)
master_ifindex = 0; /* no master interface */
else if (r < 0)
return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
if (master_ifindex == link->ifindex)
master_ifindex = 0;
if (master_ifindex != link->master_ifindex) {
if (link->master_ifindex == 0)
log_link_debug(link, "Attached to master interface: %i", master_ifindex);
else if (master_ifindex == 0)
log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
else
log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
glyph(GLYPH_ARROW_RIGHT), master_ifindex);
link_drop_from_master(link);
link->master_ifindex = master_ifindex;
/* Updating master ifindex may cause operational state change, e.g. carrier <-> enslaved */
link_dirty(link);
}
r = link_append_to_master(link);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to append link to master: %m");
return 0;
}
static int link_update_driver(Link *link, sd_netlink_message *message) {
int r;
assert(link);
assert(link->manager);
assert(message);
/* Driver is already read. Assuming the driver is never changed. */
if (link->ethtool_driver_read)
return 0;
/* When udevd is running, read the driver after the interface is initialized by udevd.
* Otherwise, ethtool may not work correctly. See issue #22538.
* When udevd is not running, read the value when the interface is detected. */
if (udev_available() && !link->dev)
return 0;
link->ethtool_driver_read = true;
r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
if (r < 0) {
log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
return 0;
}
log_link_debug(link, "Found driver: %s", strna(link->driver));
if (streq_ptr(link->driver, "dsa")) {
uint32_t dsa_master_ifindex = 0;
r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
if (r < 0 && r != -ENODATA)
return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
if (dsa_master_ifindex > INT_MAX) {
log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
dsa_master_ifindex);
dsa_master_ifindex = 0;
}
link->dsa_master_ifindex = (int) dsa_master_ifindex;
}
return 1; /* needs reconfigure */
}
static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
int r;
assert(link);
assert(link->manager);
assert(message);
if (link->permanent_hw_addr.length > 0)
return 0;
r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
if (r == -ENODATA)
return 0;
if (r < 0)
return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
if (link->permanent_hw_addr.length > 0)
log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
return 1; /* needs reconfigure */
}
static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
struct hw_addr_data addr;
int r;
assert(link);
assert(message);
r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
if (r < 0 && r != -ENODATA)
return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
if (r == -ENODATA)
return 0;
if (r < 0)
return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
if (hw_addr_equal(&link->hw_addr, &addr))
return 0;
if (link->hw_addr.length == 0)
log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
else {
log_link_debug(link, "Hardware address is changed: %s %s %s",
HW_ADDR_TO_STR(&link->hw_addr),
glyph(GLYPH_ARROW_RIGHT),
HW_ADDR_TO_STR(&addr));
hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
}
link->hw_addr = addr;
if (!hw_addr_is_null(&link->hw_addr)) {
r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
if (r == -EEXIST && streq_ptr(link->kind, "bond"))
/* bonding master and its slaves have the same hardware address. */
r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
if (r < 0)
log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
}
r = ipv4acd_update_mac(link);
if (r < 0)
return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
r = ipv4ll_update_mac(link);
if (r < 0)
return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
r = dhcp4_update_mac(link);
if (r < 0)
return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
r = dhcp6_update_mac(link);
if (r < 0)
return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
r = radv_update_mac(link);
if (r < 0)
return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
if (r < 0)
return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
}
if (link->lldp_rx) {
r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
if (r < 0)
return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
}
if (link->lldp_tx) {
r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
if (r < 0)
return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
}
return 1; /* needs reconfigure */
}
static int link_update_mtu(Link *link, sd_netlink_message *message) {
uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
int r;
assert(link);
assert(message);
r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
if (r == -ENODATA)
return 0;
if (r < 0)
return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
if (mtu == 0)
return 0;
r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
if (r < 0 && r != -ENODATA)
return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
if (r < 0 && r != -ENODATA)
return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
if (max_mtu == 0)
max_mtu = UINT32_MAX;
link->min_mtu = min_mtu;
link->max_mtu = max_mtu;
if (link->original_mtu == 0) {
link->original_mtu = mtu;
log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
link->original_mtu, link->min_mtu, link->max_mtu);
}
if (link->mtu == mtu)
return 0;
if (link->mtu != 0)
log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
link->mtu, glyph(GLYPH_ARROW_RIGHT), mtu,
link->min_mtu, link->max_mtu);
link->mtu = mtu;
if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
/* The kernel resets IPv6 MTU after changing device MTU. So, we need to re-set IPv6 MTU again. */
(void) link_set_ipv6_mtu_async(link);
if (link->dhcp_client) {
r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
if (r < 0)
return log_link_debug_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_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
}
return 0;
}
static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
_cleanup_strv_free_ char **altnames = NULL;
int r;
assert(link);
assert(message);
r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
if (r == -ENODATA)
/* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
* interface has no alternative name. */
return 0;
if (r < 0)
return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
if (strv_equal(altnames, link->alternative_names))
return 0;
STRV_FOREACH(n, link->alternative_names)
hashmap_remove(link->manager->links_by_name, *n);
strv_free_and_replace(link->alternative_names, altnames);
STRV_FOREACH(n, link->alternative_names) {
r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
}
return 1; /* needs reconfigure */
}
static int link_update_name(Link *link, sd_netlink_message *message) {
char ifname_from_index[IF_NAMESIZE];
const char *ifname;
int r;
assert(link);
assert(message);
r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
if (r == -ENODATA)
/* Hmm?? But ok. */
return 0;
if (r < 0)
return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
if (streq(ifname, link->ifname))
return 0;
r = format_ifname(link->ifindex, ifname_from_index);
if (r < 0)
return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
if (!streq(ifname, ifname_from_index)) {
log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
"with the name currently configured on the actual interface '%s'. Ignoring.",
ifname, ifname_from_index);
return 0;
}
log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
hashmap_remove(link->manager->links_by_name, link->ifname);
r = free_and_strdup(&link->ifname, ifname);
if (r < 0)
return log_oom_debug();
r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
if (link->dhcp_client) {
r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
}
if (link->dhcp6_client) {
r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to update interface name in DHCPv6 client: %m");
}
if (link->ndisc) {
r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
}
if (link->dhcp_relay_interface) {
r = sd_dhcp_relay_interface_set_ifname(link->dhcp_relay_interface, link->ifname);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to update interface name in DHCP relay interface: %m");
}
if (link->dhcp_server) {
r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
}
if (link->radv) {
r = sd_radv_set_ifname(link->radv, link->ifname);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
}
if (link->lldp_rx) {
r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
}
if (link->lldp_tx) {
r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
}
if (link->ipv4ll) {
r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
}
r = ipv4acd_set_ifname(link);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
return 1; /* needs reconfigure */
}
static int link_update(Link *link, sd_netlink_message *message) {
bool needs_reconfigure = false;
int r;
assert(link);
assert(message);
r = link_update_name(link, message);
if (r < 0)
return r;
needs_reconfigure = needs_reconfigure || r > 0;
r = link_update_alternative_names(link, message);
if (r < 0)
return r;
needs_reconfigure = needs_reconfigure || r > 0;
r = link_update_mtu(link, message);
if (r < 0)
return r;
r = link_update_driver(link, message);
if (r < 0)
return r;
needs_reconfigure = needs_reconfigure || r > 0;
r = link_update_permanent_hardware_address(link, message);
if (r < 0)
return r;
needs_reconfigure = needs_reconfigure || r > 0;
r = link_update_hardware_address(link, message);
if (r < 0)
return r;
needs_reconfigure = needs_reconfigure || r > 0;
r = link_update_master(link, message);
if (r < 0)
return r;
r = link_update_ipv6ll_addrgen_mode(link, message);
if (r < 0)
return r;
r = link_update_flags(link, message);
if (r < 0)
return r;
r = link_update_bridge_vlan(link, message);
if (r < 0)
return r;
return needs_reconfigure;
}
static Link *link_drop_or_unref(Link *link) {
if (!link)
return NULL;
if (!link->manager)
return link_unref(link);
return link_drop(link);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
_cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL;
_cleanup_(link_drop_or_unrefp) Link *link = NULL;
unsigned short iftype;
int r, ifindex;
assert(manager);
assert(message);
assert(ret);
r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
if (r < 0)
return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
else if (ifindex <= 0)
return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
r = sd_rtnl_message_link_get_type(message, &iftype);
if (r < 0)
return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
if (r < 0)
return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
/* check for link kind */
r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
if (r >= 0) {
r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
if (r < 0 && r != -ENODATA)
return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
r = sd_netlink_message_exit_container(message);
if (r < 0)
return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
}
if (!manager->test_mode) {
/* Do not update state files when running in test mode. */
if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
return log_oom_debug();
}
link = new(Link, 1);
if (!link)
return -ENOMEM;
*link = (Link) {
.n_ref = 1,
.state = LINK_STATE_PENDING,
.online_state = _LINK_ONLINE_STATE_INVALID,
.automatic_reconfigure_ratelimit = (const RateLimit) { .interval = 10 * USEC_PER_SEC, .burst = 5 },
.ifindex = ifindex,
.iftype = iftype,
.ifname = TAKE_PTR(ifname),
.kind = TAKE_PTR(kind),
.bridge_vlan_pvid = UINT16_MAX,
.ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
.state_file = TAKE_PTR(state_file),
.n_dns = UINT_MAX,
.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,
};
r = hashmap_ensure_put(&manager->links_by_index, &link_hash_ops, INT_TO_PTR(link->ifindex), link);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
link->manager = manager;
r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
/* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
* message arrived too early. Request the wireless link information again.
*/
if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) {
r = link_get_wlan_interface(link);
if (r < 0)
log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m");
}
*ret = TAKE_PTR(link);
return 0;
}
int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
Link *link = NULL;
NetDev *netdev = NULL;
uint16_t type;
const char *name;
int r, ifindex;
assert(rtnl);
assert(message);
assert(manager);
if (sd_netlink_message_is_error(message)) {
r = sd_netlink_message_get_errno(message);
if (r < 0)
log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
return 0;
}
r = sd_netlink_message_get_type(message, &type);
if (r < 0) {
log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
return 0;
} else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
return 0;
}
r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
if (r < 0) {
log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
return 0;
} else if (ifindex <= 0) {
log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
return 0;
}
r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
if (r < 0) {
log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
return 0;
}
(void) link_get_by_index(manager, ifindex, &link);
(void) netdev_get(manager, name, &netdev);
switch (type) {
case RTM_NEWLINK:
if (netdev) {
/* netdev exists, so make sure the ifindex matches */
r = netdev_set_ifindex(netdev, message);
if (r < 0) {
log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
netdev_enter_failed(netdev);
return 0;
}
}
if (!link) {
/* link is new, so add it */
r = link_new(manager, message, &link);
if (r < 0) {
log_warning_errno(r, "Could not process new link message: %m");
return 0;
}
r = link_update(link, message);
if (r < 0) {
log_link_warning_errno(link, r, "Could not process link message: %m");
link_enter_failed(link);
return 0;
}
if (link->manager->test_mode) {
log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
link_set_state(link, LINK_STATE_UNMANAGED);
return 0;
}
/* Do not enter initialized state if we are enumerating. */
if (manager->enumerating)
return 0;
r = link_check_initialized(link);
if (r < 0) {
log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
link_enter_failed(link);
return 0;
}
} else {
r = link_update(link, message);
if (r < 0) {
log_link_warning_errno(link, r, "Could not process link message: %m");
link_enter_failed(link);
return 0;
}
if (r == 0)
return 0;
if (link->manager->test_mode) {
log_link_debug(link, "Running in test mode, refusing to configure interface.");
link_set_state(link, LINK_STATE_UNMANAGED);
return 0;
}
/* Do not configure interface if we are enumerating. */
if (manager->enumerating)
return 0;
r = link_reconfigure_impl(link, /* flags= */ 0);
if (r < 0) {
log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
link_enter_failed(link);
return 0;
}
}
break;
case RTM_DELLINK:
link_drop(link);
netdev_drop(netdev);
break;
default:
assert_not_reached();
}
return 1;
}
int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
uint16_t message_type;
int r;
assert(m);
assert(link);
assert(error_msg);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 0;
r = sd_netlink_message_get_errno(m);
if (r < 0) {
log_link_message_warning_errno(link, m, r, "%s", error_msg);
link_enter_failed(link);
return 0;
}
r = sd_netlink_message_get_type(m, &message_type);
if (r < 0) {
log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
return 0;
}
if (message_type != RTM_NEWLINK) {
log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
return 0;
}
r = link_update(link, m);
if (r < 0) {
link_enter_failed(link);
return 0;
}
return 1;
}
int link_call_getlink(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);
assert(callback);
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, callback,
link_netlink_destroy_callback, link);
if (r < 0)
return r;
link_ref(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 link_flags_to_string_alloc(uint32_t flags, char **ret) {
_cleanup_free_ char *str = NULL;
static const char* map[] = {
[LOG2U(IFF_UP)] = "up", /* interface is up. */
[LOG2U(IFF_BROADCAST)] = "broadcast", /* broadcast address valid. */
[LOG2U(IFF_DEBUG)] = "debug", /* turn on debugging. */
[LOG2U(IFF_LOOPBACK)] = "loopback", /* interface is a loopback net. */
[LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
[LOG2U(IFF_NOTRAILERS)] = "no-trailers", /* avoid use of trailers. */
[LOG2U(IFF_RUNNING)] = "running", /* interface RFC2863 OPER_UP. */
[LOG2U(IFF_NOARP)] = "no-arp", /* no ARP protocol. */
[LOG2U(IFF_PROMISC)] = "promiscuous", /* receive all packets. */
[LOG2U(IFF_ALLMULTI)] = "all-multicast", /* receive all multicast packets. */
[LOG2U(IFF_MASTER)] = "master", /* master of a load balancer. */
[LOG2U(IFF_SLAVE)] = "slave", /* slave of a load balancer. */
[LOG2U(IFF_MULTICAST)] = "multicast", /* supports multicast. */
[LOG2U(IFF_PORTSEL)] = "portsel", /* can set media type. */
[LOG2U(IFF_AUTOMEDIA)] = "auto-media", /* auto media select active. */
[LOG2U(IFF_DYNAMIC)] = "dynamic", /* dialup device with changing addresses. */
[LOG2U(IFF_LOWER_UP)] = "lower-up", /* driver signals L1 up. */
[LOG2U(IFF_DORMANT)] = "dormant", /* driver signals dormant. */
[LOG2U(IFF_ECHO)] = "echo", /* echo sent packets. */
};
assert(ret);
for (size_t i = 0; i < ELEMENTSOF(map); i++)
if (BIT_SET(flags, i) && map[i])
if (!strextend_with_separator(&str, ",", map[i]))
return -ENOMEM;
*ret = TAKE_PTR(str);
return 0;
}
static const char * const kernel_operstate_table[] = {
[IF_OPER_UNKNOWN] = "unknown",
[IF_OPER_NOTPRESENT] = "not-present",
[IF_OPER_DOWN] = "down",
[IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
[IF_OPER_TESTING] = "testing",
[IF_OPER_DORMANT] = "dormant",
[IF_OPER_UP] = "up",
};
DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);
bool link_has_local_lease_domain(Link *link) {
assert(link);
return link->dhcp_server &&
link->network &&
link->network->dhcp_server_local_lease_domain &&
!dns_name_is_root(link->network->dhcp_server_local_lease_domain);
}
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