Google Git
Sign in
third-party-mirror / systemd / 2398d87694e8af48e92ff8fb5f9cf273f706fb00 / . / src / network / networkd-link.c
blob: 20675f2306e7e3ae50bac9b2349016c496da7893 [file] [log] [blame]
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <net/if.h>
#include <netinet/in.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/if_link.h>
#include <linux/netdevice.h>
#include <sys/socket.h>
#include <unistd.h>
#include "alloc-util.h"
#include "batadv.h"
#include "bond.h"
#include "bridge.h"
#include "bus-util.h"
#include "device-private.h"
#include "device-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 "format-util.h"
#include "fs-util.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-bridge-fdb.h"
#include "networkd-bridge-mdb.h"
#include "networkd-can.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-bus.h"
#include "networkd-link.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-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 "set.h"
#include "socket-util.h"
#include "stat-util.h"
#include "stdio-util.h"
#include "string-table.h"
#include "strv.h"
#include "tc.h"
#include "tmpfile-util.h"
#include "udev-util.h"
#include "util.h"
#include "vrf.h"
bool link_ipv4ll_enabled(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
return false;
if (!link->network)
return false;
if (link->iftype == ARPHRD_CAN)
return false;
if (link->hw_addr.length != ETH_ALEN)
return false;
if (ether_addr_is_null(&link->hw_addr.ether))
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 & ADDRESS_FAMILY_IPV4;
}
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;
}
bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
assert(link);
if (!link->network) {
if (!allow_unmanaged)
return false;
return link_has_carrier(link);
}
if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
return false;
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->stacked_netdevs_created)
return false;
if (!link->activated)
return false;
return true;
}
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_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->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);
}
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->addresses_ipv4acd = set_free(link->addresses_ipv4acd);
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->dhcp6_pd_prefixes = set_free(link->dhcp6_pd_prefixes);
link_free_engines(link);
free(link->ifname);
strv_free(link->alternative_names);
free(link->kind);
free(link->ssid);
free(link->driver);
unlink_and_free(link->lease_file);
unlink_and_free(link->lldp_file);
unlink_and_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_by_index(Manager *m, int ifindex, Link **ret) {
Link *link;
assert(m);
assert(ifindex > 0);
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", NULL);
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->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
(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_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 = ipv4acd_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);
}
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. */
link_set_state(link, LINK_STATE_CONFIGURED);
return;
}
if (!link->static_addresses_configured)
return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
SET_FOREACH(a, link->addresses)
if (!address_is_ready(a)) {
_cleanup_free_ char *str = NULL;
(void) in_addr_prefix_to_string(a->family, &a->in_addr, a->prefixlen, &str);
return (void) log_link_debug(link, "%s(): an address %s is not ready.", __func__, strna(str));
}
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__);
/* 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__);
bool has_ndisc_address = false;
NDiscAddress *n;
SET_FOREACH(n, link->ndisc_addresses)
if (!n->marked) {
has_ndisc_address = true;
break;
}
if ((link_dhcp4_enabled(link) || link_dhcp6_with_address_enabled(link) || link_ipv4ll_enabled(link)) &&
!link->dhcp_address && set_isempty(link->dhcp6_addresses) && !has_ndisc_address &&
!link->ipv4ll_address_configured)
/* When DHCP[46] or IPv4LL is enabled, at least one address is acquired by them. */
return (void) log_link_debug(link, "%s(): DHCP4, DHCP6 or IPv4LL is enabled but no dynamic address is assigned yet.", __func__);
/* Ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || link_dhcp6_pd_is_enabled(link) ||
(!link->network->configure_without_carrier && link_ipv6_accept_ra_enabled(link)) ||
link_ipv4ll_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_address_configured)
/* When DHCP[46], NDisc, or IPv4LL is enabled, at least one protocol must be finished. */
return (void) log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
log_link_debug(link, "%s(): dhcp4:%s ipv4ll:%s dhcp6_addresses:%s dhcp6_routes:%s "
"dhcp6_pd_addresses:%s dhcp6_pd_routes:%s ndisc_addresses:%s ndisc_routes:%s",
__func__,
yes_no(link->dhcp4_configured),
yes_no(link->ipv4ll_address_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_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;
}
static int link_request_stacked_netdevs(Link *link) {
NetDev *netdev;
int r;
assert(link);
link->stacked_netdevs_created = false;
link->stacked_netdevs_after_configured_created = false;
HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
r = link_request_to_crate_stacked_netdev(link, netdev);
if (r < 0)
return r;
}
if (link->create_stacked_netdev_messages == 0)
link->stacked_netdevs_created = true;
if (link->create_stacked_netdev_after_configured_messages == 0)
link->stacked_netdevs_after_configured_created = true;
return 0;
}
static int link_acquire_dynamic_ipv6_conf(Link *link) {
int r;
assert(link);
if (link->radv) {
assert(link->radv);
assert(in6_addr_is_link_local(&link->ipv6ll_address));
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");
}
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");
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_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");
} else if (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_server) {
r = sd_dhcp_server_start(link->dhcp_server);
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);
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;
}
r = link_lldp_emit_start(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
return 0;
}
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_dynamic_ipv6_conf(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
return 0;
}
int link_handle_bound_to_list(Link *link) {
bool required_up = false;
bool link_is_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;
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)
return link_request_to_bring_up_or_down(link, /* up = */ false);
if (required_up && !link_is_up)
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. */
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_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 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;
return link_handle_bound_to_list(link);
}
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 void link_free_carrier_maps(Link *link) {
assert(link);
link_free_bound_to_list(link);
link_free_bound_by_list(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, NULL, 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 void link_drop_requests(Link *link) {
Request *req;
assert(link);
assert(link->manager);
ORDERED_SET_FOREACH(req, link->manager->request_queue)
if (req->link == link)
request_drop(req);
}
static Link *link_drop(Link *link) {
char **n;
if (!link)
return NULL;
assert(link->manager);
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. */
link_drop_requests(link);
link_free_carrier_maps(link);
link_drop_from_master(link);
link_unref(set_remove(link->manager->links_requesting_uuid, link));
(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. */
if (hashmap_get(link->manager->links_by_hw_addr, &link->hw_addr) == link)
hashmap_remove(link->manager->links_by_hw_addr, &link->hw_addr);
/* The following must be called at last. */
assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
return link_unref(link);
}
static int link_drop_foreign_config(Link *link) {
int k, r;
assert(link);
assert(link->manager);
r = link_drop_foreign_routes(link);
k = link_drop_foreign_nexthops(link);
if (k < 0 && r >= 0)
r = k;
k = link_drop_foreign_addresses(link);
if (k < 0 && r >= 0)
r = k;
k = link_drop_foreign_neighbors(link);
if (k < 0 && r >= 0)
r = k;
k = manager_drop_foreign_routing_policy_rules(link->manager);
if (k < 0 && r >= 0)
r = k;
return r;
}
static int link_drop_config(Link *link) {
int k, r;
assert(link);
assert(link->manager);
r = link_drop_routes(link);
k = link_drop_nexthops(link);
if (k < 0 && r >= 0)
r = k;
k = link_drop_addresses(link);
if (k < 0 && r >= 0)
r = k;
k = link_drop_neighbors(link);
if (k < 0 && r >= 0)
r = k;
k = manager_drop_routing_policy_rules(link->manager, link);
if (k < 0 && r >= 0)
r = k;
ndisc_flush(link);
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_configure_traffic_control(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_configure_sr_iov(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_flags(link);
if (r < 0)
return r;
r = link_request_to_set_group(link);
if (r < 0)
return r;
r = link_configure_mtu(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);
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 = 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 = link_request_dhcp_server(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;
/* 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;
}
r = link_request_static_configs(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->sd_device,
&link->hw_addr.ether,
&link->permanent_mac,
link->driver,
link->iftype,
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->sd_device) {
uint8_t name_assign_type = NET_NAME_UNKNOWN;
const char *attr;
if (sd_device_get_sysattr_value(link->sd_device, "name_assign_type", &attr) >= 0)
(void) safe_atou8(attr, &name_assign_type);
warn = name_assign_type == NET_NAME_ENUM;
}
log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
"found matching network '%s'%s.",
network->filename,
warn ? ", based on potentially unpredictable interface name" : "");
if (network->unmanaged)
return -ENOENT;
*ret = network;
return 0;
}
return -ENOENT;
}
static int link_reconfigure_impl(Link *link, bool force) {
Network *network;
int r;
assert(link);
r = link_get_network(link, &network);
if (r == -ENOENT) {
link_set_state(link, LINK_STATE_UNMANAGED);
return 0;
}
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;
link_drop_requests(link);
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 foreign 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);
link_unref(set_remove(link->manager->links_requesting_uuid, link));
/* Then, apply new .network file */
link->network = network_ref(network);
link_update_operstate(link, true);
link_dirty(link);
r = link_new_carrier_maps(link);
if (r < 0)
return r;
link_set_state(link, LINK_STATE_INITIALIZED);
link->activated = false;
r = link_configure(link);
if (r < 0)
return r;
return 1;
}
static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
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, force);
if (r < 0)
link_enter_failed(link);
return 0;
}
static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
return link_reconfigure_handler_internal(rtnl, m, link, false);
}
static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
return link_reconfigure_handler_internal(rtnl, m, link, true);
}
int link_reconfigure(Link *link, bool force) {
int r;
/* When link in pending or initialized state, then link_configure() will be called. To prevent
* the function from being called multiple times simultaneously, refuse to reconfigure the
* interface in these cases. */
if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
return 0; /* 0 means no-op. */
r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
if (r < 0)
return r;
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 from link_check_initialized() if running in a container. */
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 = link_get_network(link, &network);
if (r == -ENOENT) {
link_set_state(link, LINK_STATE_UNMANAGED);
return 0;
}
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");
}
link->network = network_ref(network);
link_update_operstate(link, false);
link_dirty(link);
}
r = link_new_bound_to_list(link);
if (r < 0)
return r;
return link_configure(link);
}
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) {
assert(link);
assert(device);
/* Always replace with the new sd_device object. As the sysname (and possibly other properties
* or sysattrs) may be outdated. */
sd_device_ref(device);
sd_device_unref(link->sd_device);
link->sd_device = device;
/* Do not ignore unamanaged state case here. If an interface is renamed after being once
* configured, and the corresponding .network file has Name= in [Match] section, then the
* interface may be already in unmanaged state. See #20657. */
if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED))
return 0;
log_link_debug(link, "udev initialized link");
link_set_state(link, LINK_STATE_INITIALIZED);
/* 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);
}
static int link_check_initialized(Link *link) {
_cleanup_(sd_device_unrefp) sd_device *device = NULL;
int r;
assert(link);
if (path_is_read_only_fs("/sys") > 0)
/* no udev */
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 = sd_device_get_is_initialized(device);
if (r < 0)
return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %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(sd_device_monitor *monitor, sd_device *device, void *userdata) {
sd_device_action_t action;
Manager *m = userdata;
Link *link = NULL;
int r, ifindex;
assert(m);
assert(device);
r = sd_device_get_action(device, &action);
if (r < 0) {
log_device_debug_errno(device, r, "Failed to get udev action, ignoring device: %m");
return 0;
}
/* Ignore the "remove" uevent — let's remove a device only if rtnetlink says so. All other uevents
* are "positive" events in some form, i.e. inform us about a changed or new network interface, that
* still exists — and we are interested in that. */
if (action == SD_DEVICE_REMOVE)
return 0;
r = sd_device_get_ifindex(device, &ifindex);
if (r < 0) {
log_device_debug_errno(device, r, "Ignoring udev %s event for device without ifindex or with invalid ifindex: %m",
device_action_to_string(action));
return 0;
}
r = device_is_renaming(device);
if (r < 0) {
log_device_debug_errno(device, r, "Failed to determine the device is renamed or not, ignoring '%s' uevent: %m",
device_action_to_string(action));
return 0;
}
if (r > 0) {
log_device_debug(device, "Interface is under renaming, wait for the interface to be renamed.");
return 0;
}
r = link_get_by_index(m, ifindex, &link);
if (r < 0) {
log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
return 0;
}
r = link_initialized(link, device);
if (r < 0)
link_enter_failed(link);
return 0;
}
static int link_carrier_gained(Link *link) {
int r;
assert(link);
r = link_handle_bound_by_list(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. */
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(Link *link) {
int r;
assert(link);
r = link_handle_bound_by_list(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. */
return 0;
if (link->network && link->network->ignore_carrier_loss)
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 foreign config", link_state_to_string(link->state));
r = link_drop_foreign_config(link);
if (r < 0)
return r;
}
return 0;
}
int link_carrier_reset(Link *link) {
int r;
assert(link);
if (!link_has_carrier(link))
return 0;
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;
}
static int link_admin_state_up(Link *link) {
int r;
assert(link);
/* This is called every time an interface admin state changes to up;
* specifically, when IFF_UP flag changes from unset to set. */
if (!link->network)
return 0;
if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
log_link_info(link, "ActivationPolicy is \"always-off\", 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. */
r = link_set_ipv6_mtu(link);
if (r < 0)
log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
return 0;
}
static int link_admin_state_down(Link *link) {
assert(link);
if (!link->network)
return 0;
if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
log_link_info(link, "ActivationPolicy is \"always-on\", forcing link up.");
return link_request_to_bring_up_or_down(link, /* up = */ true);
}
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 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 LinkAddressState address_state_from_scope(uint8_t scope) {
if (scope < RT_SCOPE_SITE)
/* universally accessible addresses found */
return LINK_ADDRESS_STATE_ROUTABLE;
if (scope < RT_SCOPE_HOST)
/* only link or site local addresses found */
return LINK_ADDRESS_STATE_DEGRADED;
/* no useful addresses found */
return LINK_ADDRESS_STATE_OFF;
}
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;
uint8_t ipv4_scope = RT_SCOPE_NOWHERE, ipv6_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->family == AF_INET)
ipv4_scope = MIN(ipv4_scope, address->scope);
if (address->family == AF_INET6)
ipv6_scope = MIN(ipv6_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->family == AF_INET)
ipv4_scope = MIN(ipv4_scope, address->scope);
if (address->family == AF_INET6)
ipv6_scope = MIN(ipv6_scope, address->scope);
}
ipv4_address_state = address_state_from_scope(ipv4_scope);
ipv6_address_state = address_state_from_scope(ipv6_scope);
address_state = address_state_from_scope(MIN(ipv4_scope, ipv6_scope));
/* 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;
/* 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 (operstate < link->network->required_operstate_for_online.min ||
operstate > link->network->required_operstate_for_online.max)
online_state = LINK_ONLINE_STATE_OFFLINE;
else {
AddressFamily required_family = link->network->required_family_for_online;
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 (link->network->required_operstate_for_online.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 (link->network->required_operstate_for_online.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);
}
}
#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_lower_up, 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_lower_up = link->flags & IFF_LOWER_UP;
link_was_admin_up = link->flags & IFF_UP;
had_carrier = link_has_carrier(link);
link->flags = flags;
link->kernel_operstate = operstate;
link_update_operstate(link, true);
if (!link_was_lower_up && (link->flags & IFF_LOWER_UP)) {
r = wifi_get_info(link);
if (r < 0)
return r;
if (r > 0) {
/* All link information is up-to-date. So, it is not necessary to call
* RTM_GETLINK netlink method again. */
r = link_reconfigure_impl(link, /* force = */ false);
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_admin_state_down(link);
if (r < 0)
return r;
}
r = link_update_lldp(link);
if (r < 0)
return r;
if (!had_carrier && link_has_carrier(link)) {
log_link_info(link, "Gained carrier");
r = link_carrier_gained(link);
if (r < 0)
return r;
} else if (had_carrier && !link_has_carrier(link)) {
log_link_info(link, "Lost carrier");
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)
return 0;
if (r < 0)
return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
if (master_ifindex == link->master_ifindex)
return 0;
if (link->master_ifindex == 0)
log_link_debug(link, "Joined to master interface: %i", master_ifindex);
else if (master_ifindex == 0)
log_link_debug(link, "Leaved from master interface: %i", link->master_ifindex);
else
log_link_debug(link, "Master interface is changed: %i → %i", link->master_ifindex, master_ifindex);
link_drop_from_master(link);
link->master_ifindex = master_ifindex;
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_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 (hw_addr_is_null(&link->hw_addr))
log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
else {
log_link_debug(link, "Hardware address is changed: %s → %s",
HW_ADDR_TO_STR(&link->hw_addr), HW_ADDR_TO_STR(&addr));
if (hashmap_get(link->manager->links_by_hw_addr, &link->hw_addr) == link)
hashmap_remove(link->manager->links_by_hw_addr, &link->hw_addr);
}
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 = ipv4ll_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) {
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) {
r = sd_lldp_set_filter_address(link->lldp, &link->hw_addr.ether);
if (r < 0)
return log_link_debug_errno(link, r, "Could not update MAC address for LLDP: %m");
}
return 0;
}
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" → %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
link->mtu, mtu, link->min_mtu, link->max_mtu);
link->mtu = mtu;
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;
char **n;
int r;
assert(link);
assert(message);
r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
if (r < 0 && r != -ENODATA)
return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
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 0;
}
static int link_update_name(Link *link, sd_netlink_message *message) {
char ifname_from_index[IF_NAMESIZE + 1];
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;
if (!format_ifname(link->ifindex, ifname_from_index))
return log_link_debug_errno(link, SYNTHETIC_ERRNO(ENXIO), "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");
return 0;
}
static int link_update(Link *link, sd_netlink_message *message) {
int r;
assert(link);
assert(message);
r = link_update_name(link, message);
if (r < 0)
return r;
r = link_update_alternative_names(link, message);
if (r < 0)
return r;
r = link_update_mtu(link, message);
if (r < 0)
return r;
r = link_update_hardware_address(link, message);
if (r < 0)
return r;
r = link_update_master(link, message);
if (r < 0)
return r;
return link_update_flags(link, message);
}
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, *lease_file = NULL, *lldp_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 (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
return log_oom_debug();
if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
return log_oom_debug();
if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%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,
.ifindex = ifindex,
.iftype = iftype,
.ifname = TAKE_PTR(ifname),
.kind = TAKE_PTR(kind),
.state_file = TAKE_PTR(state_file),
.lease_file = TAKE_PTR(lease_file),
.lldp_file = TAKE_PTR(lldp_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, NULL, 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");
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");
log_link_debug(link, "Link %d added", link->ifindex);
*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_warning_errno(r, "Could not process new link message for netdev, ignoring: %m");
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_warning_errno(r, "Could not process link message: %m");
link_enter_failed(link);
return 0;
}
r = link_check_initialized(link);
if (r < 0) {
log_warning_errno(r, "Failed to check link is initialized: %m");
link_enter_failed(link);
return 0;
}
} else {
r = link_update(link, message);
if (r < 0) {
log_warning_errno(r, "Could not process link message: %m");
link_enter_failed(link);
return 0;
}
}
break;
case RTM_DELLINK:
link_drop(link);
netdev_drop(netdev);
break;
default:
assert_not_reached("Received link message with invalid RTNL message type.");
}
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, 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);