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Systemd/src/network/networkd-link.c

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <netinet/in.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/if_link.h>
#include <unistd.h>
#include "alloc-util.h"
#include "bond.h"
#include "bridge.h"
#include "bus-util.h"
#include "dhcp-identifier.h"
#include "dhcp-lease-internal.h"
#include "env-file.h"
#include "ethtool-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "ipvlan.h"
#include "missing_network.h"
#include "netlink-util.h"
#include "network-internal.h"
#include "networkd-address-label.h"
#include "networkd-address.h"
#include "networkd-can.h"
#include "networkd-dhcp-server.h"
#include "networkd-dhcp4.h"
#include "networkd-dhcp6.h"
#include "networkd-fdb.h"
#include "networkd-ipv4ll.h"
#include "networkd-ipv6-proxy-ndp.h"
#include "networkd-link-bus.h"
#include "networkd-link.h"
#include "networkd-lldp-tx.h"
#include "networkd-manager.h"
#include "networkd-mdb.h"
#include "networkd-ndisc.h"
#include "networkd-neighbor.h"
#include "networkd-nexthop.h"
#include "networkd-sriov.h"
#include "networkd-sysctl.h"
#include "networkd-radv.h"
#include "networkd-routing-policy-rule.h"
#include "networkd-wifi.h"
#include "set.h"
#include "socket-util.h"
#include "stat-util.h"
#include "stdio-util.h"
#include "string-table.h"
#include "strv.h"
#include "sysctl-util.h"
#include "tc.h"
#include "tmpfile-util.h"
#include "udev-util.h"
#include "util.h"
#include "vrf.h"
bool link_ipv4ll_enabled(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
return false;
if (!link->network)
return false;
if (link->iftype == ARPHRD_CAN)
return false;
if (STRPTR_IN_SET(link->kind,
"vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti",
"vti6", "nlmon", "xfrm", "bareudp"))
return false;
/* L3 or L3S mode do not support ARP. */
if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
return false;
if (link->network->bond)
return false;
return link->network->link_local & 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;
}
static bool link_is_enslaved(Link *link) {
if (link->flags & IFF_SLAVE)
/* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
return true;
if (!link->network)
return false;
if (link->master_ifindex > 0 && link->network->bridge)
return true;
/* TODO: add conditions for other netdevs. */
return false;
}
static void link_update_master_operstate(Link *link, NetDev *netdev) {
Link *master;
if (!netdev)
return;
if (netdev->ifindex <= 0)
return;
if (link_get(link->manager, netdev->ifindex, &master) < 0)
return;
link_update_operstate(master, true);
}
void link_update_operstate(Link *link, bool also_update_master) {
LinkOperationalState operstate;
LinkCarrierState carrier_state;
LinkAddressState address_state;
_cleanup_strv_free_ char **p = NULL;
uint8_t scope = RT_SCOPE_NOWHERE;
bool changed = false;
Address *address;
assert(link);
if (link->kernel_operstate == IF_OPER_DORMANT)
carrier_state = LINK_CARRIER_STATE_DORMANT;
else if (link_has_carrier(link)) {
if (link_is_enslaved(link))
carrier_state = LINK_CARRIER_STATE_ENSLAVED;
else
carrier_state = LINK_CARRIER_STATE_CARRIER;
} else if (link->flags & IFF_UP)
carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
else
carrier_state = LINK_CARRIER_STATE_OFF;
if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
Link *slave;
SET_FOREACH(slave, link->slaves) {
link_update_operstate(slave, false);
if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
}
}
SET_FOREACH(address, link->addresses) {
if (!address_is_ready(address))
continue;
if (address->scope < scope)
scope = address->scope;
}
/* for operstate we also take foreign addresses into account */
SET_FOREACH(address, link->addresses_foreign) {
if (!address_is_ready(address))
continue;
if (address->scope < scope)
scope = address->scope;
}
if (scope < RT_SCOPE_SITE)
/* universally accessible addresses found */
address_state = LINK_ADDRESS_STATE_ROUTABLE;
else if (scope < RT_SCOPE_HOST)
/* only link or site local addresses found */
address_state = LINK_ADDRESS_STATE_DEGRADED;
else
/* no useful addresses found */
address_state = LINK_ADDRESS_STATE_OFF;
/* Mapping of address and carrier state vs operational state
* carrier state
* | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
* ------------------------------------------------------------------------------
* off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
* address_state degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
* routable | off | no-carrier | dormant | degraded-carrier | routable | routable
*/
if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
operstate = (LinkOperationalState) carrier_state;
else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
operstate = LINK_OPERSTATE_ROUTABLE;
else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
operstate = LINK_OPERSTATE_DEGRADED;
else
operstate = LINK_OPERSTATE_ENSLAVED;
if (link->carrier_state != carrier_state) {
link->carrier_state = carrier_state;
changed = true;
if (strv_extend(&p, "CarrierState") < 0)
log_oom();
}
if (link->address_state != address_state) {
link->address_state = address_state;
changed = true;
if (strv_extend(&p, "AddressState") < 0)
log_oom();
}
if (link->operstate != operstate) {
link->operstate = operstate;
changed = true;
if (strv_extend(&p, "OperationalState") < 0)
log_oom();
}
if (p)
link_send_changed_strv(link, p);
if (changed)
link_dirty(link);
if (also_update_master && link->network) {
link_update_master_operstate(link, link->network->bond);
link_update_master_operstate(link, link->network->bridge);
}
}
#define FLAG_STRING(string, flag, old, new) \
(((old ^ new) & flag) \
? ((old & flag) ? (" -" string) : (" +" string)) \
: "")
static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
uint8_t operstate;
int r;
assert(link);
r = sd_rtnl_message_link_get_flags(m, &flags);
if (r < 0)
return log_link_warning_errno(link, r, "Could not get link flags: %m");
r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
if (r < 0)
/* if we got a message without operstate, take it to mean
the state was unchanged */
operstate = link->kernel_operstate;
if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
return 0;
if (link->flags != flags) {
log_link_debug(link, "Flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
FLAG_STRING("UP", IFF_UP, link->flags, flags),
FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
/* link flags are currently at most 18 bits, let's align to
* printing 20 */
if (unknown_flags_added)
log_link_debug(link,
"Unknown link flags gained: %#.5x (ignoring)",
unknown_flags_added);
if (unknown_flags_removed)
log_link_debug(link,
"Unknown link flags lost: %#.5x (ignoring)",
unknown_flags_removed);
}
link->flags = flags;
link->kernel_operstate = operstate;
link_update_operstate(link, true);
return 0;
}
static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
_cleanup_(link_unrefp) Link *link = NULL;
const char *ifname, *kind = NULL;
unsigned short iftype;
int r, ifindex;
uint16_t type;
assert(manager);
assert(message);
assert(ret);
/* check for link kind */
r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
if (r == 0) {
(void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
r = sd_netlink_message_exit_container(message);
if (r < 0)
return r;
}
r = sd_netlink_message_get_type(message, &type);
if (r < 0)
return r;
else if (type != RTM_NEWLINK)
return -EINVAL;
r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
if (r < 0)
return r;
else if (ifindex <= 0)
return -EINVAL;
r = sd_rtnl_message_link_get_type(message, &iftype);
if (r < 0)
return r;
r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
if (r < 0)
return r;
link = new(Link, 1);
if (!link)
return -ENOMEM;
*link = (Link) {
.n_ref = 1,
.manager = manager,
.state = LINK_STATE_PENDING,
.ifindex = ifindex,
.iftype = iftype,
.n_dns = (unsigned) -1,
.dns_default_route = -1,
.llmnr = _RESOLVE_SUPPORT_INVALID,
.mdns = _RESOLVE_SUPPORT_INVALID,
.dnssec_mode = _DNSSEC_MODE_INVALID,
.dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
};
link->ifname = strdup(ifname);
if (!link->ifname)
return -ENOMEM;
if (kind) {
link->kind = strdup(kind);
if (!link->kind)
return -ENOMEM;
}
r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
if (r < 0)
log_link_debug_errno(link, r, "New device has no master, continuing without");
r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &link->hw_addr);
if (r < 0)
log_link_debug_errno(link, r, "Hardware address not found for new device, continuing without");
r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
if (r < 0)
log_link_debug_errno(link, r, "Broadcast address not found for new device, continuing without");
r = ethtool_get_permanent_macaddr(&manager->ethtool_fd, link->ifname, &link->permanent_mac);
if (r < 0)
log_link_debug_errno(link, r, "Permanent MAC address not found for new device, continuing without: %m");
r = ethtool_get_driver(&manager->ethtool_fd, link->ifname, &link->driver);
if (r < 0)
log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &link->alternative_names);
if (r < 0 && r != -ENODATA)
return r;
if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
return -ENOMEM;
if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
return -ENOMEM;
if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
return -ENOMEM;
r = hashmap_ensure_allocated(&manager->links, NULL);
if (r < 0)
return r;
r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
if (r < 0)
return r;
r = link_update_flags(link, message, false);
if (r < 0)
return r;
*ret = TAKE_PTR(link);
return 0;
}
void link_ntp_settings_clear(Link *link) {
link->ntp = strv_free(link->ntp);
}
void link_dns_settings_clear(Link *link) {
if (link->n_dns != (unsigned) -1)
for (unsigned i = 0; i < link->n_dns; i++)
in_addr_full_free(link->dns[i]);
link->dns = mfree(link->dns);
link->n_dns = (unsigned) -1;
link->search_domains = ordered_set_free_free(link->search_domains);
link->route_domains = ordered_set_free_free(link->route_domains);
link->dns_default_route = -1;
link->llmnr = _RESOLVE_SUPPORT_INVALID;
link->mdns = _RESOLVE_SUPPORT_INVALID;
link->dnssec_mode = _DNSSEC_MODE_INVALID;
link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
}
static void link_free_engines(Link *link) {
if (!link)
return;
link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
link->dhcp_acd = sd_ipv4acd_unref(link->dhcp_acd);
link->lldp = sd_lldp_unref(link->lldp);
link_lldp_emit_stop(link);
ndisc_flush(link);
link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
link->ndisc = sd_ndisc_unref(link->ndisc);
link->radv = sd_radv_unref(link->radv);
ipv4_dad_unref(link);
}
static Link *link_free(Link *link) {
assert(link);
link_ntp_settings_clear(link);
link_dns_settings_clear(link);
link->routes = set_free(link->routes);
link->routes_foreign = set_free(link->routes_foreign);
link->dhcp_routes = set_free(link->dhcp_routes);
link->dhcp_routes_old = set_free(link->dhcp_routes_old);
link->dhcp6_routes = set_free(link->dhcp6_routes);
link->dhcp6_routes_old = set_free(link->dhcp6_routes_old);
link->dhcp6_pd_routes = set_free(link->dhcp6_pd_routes);
link->dhcp6_pd_routes_old = set_free(link->dhcp6_pd_routes_old);
link->ndisc_routes = set_free(link->ndisc_routes);
link->nexthops = set_free(link->nexthops);
link->nexthops_foreign = set_free(link->nexthops_foreign);
link->neighbors = set_free(link->neighbors);
link->neighbors_foreign = set_free(link->neighbors_foreign);
link->addresses = set_free(link->addresses);
link->addresses_foreign = set_free(link->addresses_foreign);
link->pool_addresses = set_free(link->pool_addresses);
link->static_addresses = set_free(link->static_addresses);
link->dhcp6_addresses = set_free(link->dhcp6_addresses);
link->dhcp6_addresses_old = set_free(link->dhcp6_addresses_old);
link->dhcp6_pd_addresses = set_free(link->dhcp6_pd_addresses);
link->dhcp6_pd_addresses_old = set_free(link->dhcp6_pd_addresses_old);
link->ndisc_addresses = set_free(link->ndisc_addresses);
link_free_engines(link);
free(link->lease_file);
free(link->lldp_file);
free(link->ifname);
strv_free(link->alternative_names);
free(link->kind);
free(link->ssid);
free(link->driver);
(void) unlink(link->state_file);
free(link->state_file);
sd_device_unref(link->sd_device);
hashmap_free(link->bound_to_links);
hashmap_free(link->bound_by_links);
set_free_with_destructor(link->slaves, link_unref);
network_unref(link->network);
return mfree(link);
}
DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
int link_get(Manager *m, int ifindex, Link **ret) {
Link *link;
assert(m);
assert(ifindex > 0);
assert(ret);
link = hashmap_get(m->links, INT_TO_PTR(ifindex));
if (!link)
return -ENODEV;
*ret = link;
return 0;
}
void link_set_state(Link *link, LinkState state) {
assert(link);
if (link->state == state)
return;
log_link_debug(link, "State changed: %s -> %s",
link_state_to_string(link->state),
link_state_to_string(state));
link->state = state;
link_send_changed(link, "AdministrativeState", NULL);
}
static void link_enter_unmanaged(Link *link) {
assert(link);
link_set_state(link, LINK_STATE_UNMANAGED);
link_dirty(link);
}
int link_stop_engines(Link *link, bool may_keep_dhcp) {
int r = 0, k;
assert(link);
assert(link->manager);
assert(link->manager->event);
bool keep_dhcp = may_keep_dhcp &&
link->network &&
(link->manager->restarting ||
FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
if (!keep_dhcp) {
k = sd_dhcp_client_stop(link->dhcp_client);
if (k < 0)
r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
}
k = sd_ipv4acd_stop(link->dhcp_acd);
if (k < 0)
r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client for DHCPv4: %m");
k = sd_dhcp_server_stop(link->dhcp_server);
if (k < 0)
r = log_link_warning_errno(link, k, "Could not stop DHCPv4 server: %m");
k = sd_lldp_stop(link->lldp);
if (k < 0)
r = log_link_warning_errno(link, k, "Could not stop LLDP: %m");
k = sd_ipv4ll_stop(link->ipv4ll);
if (k < 0)
r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
k = ipv4_dad_stop(link);
if (k < 0)
r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
k = sd_dhcp6_client_stop(link->dhcp6_client);
if (k < 0)
r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
k = dhcp6_pd_remove(link);
if (k < 0)
r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m");
k = sd_ndisc_stop(link->ndisc);
if (k < 0)
r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
k = sd_radv_stop(link->radv);
if (k < 0)
r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
link_lldp_emit_stop(link);
return r;
}
void link_enter_failed(Link *link) {
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
log_link_warning(link, "Failed");
link_set_state(link, LINK_STATE_FAILED);
(void) link_stop_engines(link, false);
link_dirty(link);
}
static int link_join_netdevs_after_configured(Link *link) {
NetDev *netdev;
int r;
HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
if (netdev->ifindex > 0)
/* Assume already enslaved. */
continue;
if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
continue;
log_struct(LOG_DEBUG,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(netdev),
LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
r = netdev_join(netdev, link, NULL);
if (r < 0)
return log_struct_errno(LOG_WARNING, r,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(netdev),
LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
}
return 0;
}
static void link_enter_configured(Link *link) {
assert(link);
assert(link->network);
if (link->state != LINK_STATE_CONFIGURING)
return;
link_set_state(link, LINK_STATE_CONFIGURED);
(void) link_join_netdevs_after_configured(link);
link_dirty(link);
}
void link_check_ready(Link *link) {
Address *a;
assert(link);
if (link->state == LINK_STATE_CONFIGURED)
return;
if (link->state != LINK_STATE_CONFIGURING)
return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
if (!link->network)
return;
if (!link->addresses_configured)
return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
if (!link->neighbors_configured)
return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
SET_FOREACH(a, link->addresses)
if (!address_is_ready(a)) {
_cleanup_free_ char *str = NULL;
(void) in_addr_to_string(a->family, &a->in_addr, &str);
return (void) log_link_debug(link, "%s(): an address %s/%d is not ready.", __func__, strnull(str), a->prefixlen);
}
if (!link->static_routes_configured)
return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
if (!link->static_nexthops_configured)
return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
if (!link->routing_policy_rules_configured)
return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
if (!link->tc_configured)
return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
if (!link->sr_iov_configured)
return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
if (!link->bridge_mdb_configured)
return (void) log_link_debug(link, "%s(): Bridge MDB is not configured.", __func__);
if (link_has_carrier(link) || !link->network->configure_without_carrier) {
bool has_ndisc_address = false;
NDiscAddress *n;
if (link_ipv6ll_enabled(link) &&
in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
return (void) log_link_debug(link, "%s(): IPv6LL is not configured.", __func__);
SET_FOREACH(n, link->ndisc_addresses)
if (!n->marked) {
has_ndisc_address = true;
break;
}
if ((link_dhcp4_enabled(link) || link_dhcp6_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__);
if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || link_dhcp6_pd_is_enabled(link) ||
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 dhcp_routes:%s dhcp_pd_addresses:%s dhcp_pd_routes:%s ndisc_addresses:%s ndisc_routes:%s",
__func__,
yes_no(link->dhcp4_configured),
yes_no(link->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_enter_configured(link);
}
static int link_set_static_configs(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->state != _LINK_STATE_INVALID);
/* Reset all *_configured flags we are configuring. */
link->request_static_addresses = false;
link->addresses_configured = false;
link->addresses_ready = false;
link->neighbors_configured = false;
link->static_routes_configured = false;
link->static_nexthops_configured = false;
link->routing_policy_rules_configured = false;
r = link_set_bridge_fdb(link);
if (r < 0)
return r;
r = link_set_bridge_mdb(link);
if (r < 0)
return r;
r = link_set_neighbors(link);
if (r < 0)
return r;
r = link_set_addresses(link);
if (r < 0)
return r;
r = link_set_address_labels(link);
if (r < 0)
return r;
/* now that we can figure out a default address for the dhcp server, start it */
r = dhcp4_server_configure(link);
if (r < 0)
return r;
return 0;
}
static int link_configure_continue(Link *link);
static int link_mac_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0)
log_link_message_warning_errno(link, m, r, "Could not set MAC address, ignoring");
else
log_link_debug(link, "Setting MAC address done.");
return 1;
}
static int link_set_mac(Link *link) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(link);
assert(link->network);
assert(link->manager);
assert(link->manager->rtnl);
if (!link->network->mac)
return 0;
log_link_debug(link, "Setting MAC address");
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
if (r < 0)
return log_link_error_errno(link, r, "Could not set MAC address: %m");
r = netlink_call_async(link->manager->rtnl, NULL, req, link_mac_handler,
link_netlink_destroy_callback, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
static int link_nomaster_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0)
log_link_message_warning_errno(link, m, r, "Could not set nomaster, ignoring");
else
log_link_debug(link, "Setting nomaster done.");
return 1;
}
static int link_set_nomaster(Link *link) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(link);
assert(link->network);
assert(link->manager);
assert(link->manager->rtnl);
/* set it free if not enslaved with networkd */
if (link->network->bridge || link->network->bond || link->network->vrf)
return 0;
log_link_debug(link, "Setting nomaster");
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
r = netlink_call_async(link->manager->rtnl, NULL, req, link_nomaster_handler,
link_netlink_destroy_callback, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(m);
assert(link);
assert(link->ifname);
link->setting_mtu = false;
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0)
log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
else
log_link_debug(link, "Setting MTU done.");
if (link->state == LINK_STATE_INITIALIZED) {
r = link_configure_continue(link);
if (r < 0)
link_enter_failed(link);
}
return 1;
}
int link_set_mtu(Link *link, uint32_t mtu) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
if (mtu == 0 || link->setting_mtu)
return 0;
if (link->mtu == mtu)
return 0;
log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
/* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
* on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
"IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
mtu = IPV6_MIN_MTU;
}
r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
if (r < 0)
return log_link_error_errno(link, r, "Could not append MTU: %m");
r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
link_netlink_destroy_callback, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
link->setting_mtu = true;
return 0;
}
static bool link_reduces_vlan_mtu(Link *link) {
/* See netif_reduces_vlan_mtu() in kernel. */
return streq_ptr(link->kind, "macsec");
}
static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
uint32_t mtu = 0;
NetDev *dev;
HASHMAP_FOREACH(dev, link->network->stacked_netdevs)
if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
/* See vlan_dev_change_mtu() in kernel. */
mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
/* See macvlan_change_mtu() in kernel. */
mtu = dev->mtu;
return mtu;
}
static int link_configure_mtu(Link *link) {
uint32_t mtu;
assert(link);
assert(link->network);
if (link->network->mtu > 0)
return link_set_mtu(link, link->network->mtu);
mtu = link_get_requested_mtu_by_stacked_netdevs(link);
if (link->mtu >= mtu)
return 0;
log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
"If it is not desired, then please explicitly specify MTUBytes= setting.",
link->mtu, mtu);
return link_set_mtu(link, mtu);
}
static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(m);
assert(link);
assert(link->ifname);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0)
log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
return 1;
}
static int link_set_flags(Link *link) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
unsigned ifi_change = 0;
unsigned ifi_flags = 0;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
if (link->flags & IFF_LOOPBACK)
return 0;
if (!link->network)
return 0;
if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0 &&
link->network->promiscuous < 0)
return 0;
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
if (link->network->arp >= 0) {
ifi_change |= IFF_NOARP;
SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
}
if (link->network->multicast >= 0) {
ifi_change |= IFF_MULTICAST;
SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
}
if (link->network->allmulticast >= 0) {
ifi_change |= IFF_ALLMULTI;
SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
}
if (link->network->promiscuous >= 0) {
ifi_change |= IFF_PROMISC;
SET_FLAG(ifi_flags, IFF_PROMISC, link->network->promiscuous);
}
r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
if (r < 0)
return log_link_error_errno(link, r, "Could not set link flags: %m");
r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
link_netlink_destroy_callback, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
static int link_acquire_ipv6_conf(Link *link) {
int r;
assert(link);
if (link->ndisc) {
log_link_debug(link, "Discovering IPv6 routers");
r = sd_ndisc_start(link->ndisc);
if (r < 0 && r != -EBUSY)
return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
}
if (link->radv) {
assert(link->radv);
assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
log_link_debug(link, "Starting IPv6 Router Advertisements");
r = radv_emit_dns(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
r = sd_radv_start(link->radv);
if (r < 0 && r != -EBUSY)
return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
}
if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra,
DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST,
DHCP6_CLIENT_START_MODE_SOLICIT)) {
assert(link->dhcp6_client);
assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
if (r < 0 && r != -EBUSY)
return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
else
log_link_debug(link, "Acquiring DHCPv6 lease");
}
r = dhcp6_request_prefix_delegation(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to request DHCPv6 prefix delegation: %m");
return 0;
}
static int link_acquire_ipv4_conf(Link *link) {
int r;
assert(link);
assert(link->manager);
assert(link->manager->event);
if (link->dhcp_client) {
log_link_debug(link, "Acquiring DHCPv4 lease");
r = sd_dhcp_client_start(link->dhcp_client);
if (r < 0)
return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
} 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");
}
return 0;
}
static int link_acquire_conf(Link *link) {
int r;
assert(link);
r = link_acquire_ipv4_conf(link);
if (r < 0)
return r;
if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
r = link_acquire_ipv6_conf(link);
if (r < 0)
return r;
}
r = link_lldp_emit_start(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
return 0;
}
bool link_has_carrier(Link *link) {
/* see Documentation/networking/operstates.txt in the kernel sources */
if (link->kernel_operstate == IF_OPER_UP)
return true;
if (link->kernel_operstate == IF_OPER_UNKNOWN)
/* operstate may not be implemented, so fall back to flags */
if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
!FLAGS_SET(link->flags, IFF_DORMANT))
return true;
return false;
}
static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
link->setting_genmode = false;
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0)
log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
else
log_link_debug(link, "Setting address genmode done.");
if (link->state == LINK_STATE_INITIALIZED) {
r = link_configure_continue(link);
if (r < 0)
link_enter_failed(link);
}
return 1;
}
static int link_configure_addrgen_mode(Link *link) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
uint8_t ipv6ll_mode;
int r;
assert(link);
assert(link->network);
assert(link->manager);
assert(link->manager->rtnl);
if (!socket_ipv6_is_supported() || link->setting_genmode)
return 0;
log_link_debug(link, "Setting address genmode for link");
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
if (r < 0)
return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
r = sd_netlink_message_open_container(req, AF_INET6);
if (r < 0)
return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
if (!link_ipv6ll_enabled(link))
ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
else if (link->network->ipv6ll_address_gen_mode < 0) {
r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
if (r < 0) {
/* The file may not exist. And even if it exists, when stable_secret is unset,
* reading the file fails with EIO. */
log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
} else
ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
} else
ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
r = sd_netlink_message_close_container(req);
if (r < 0)
return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
r = sd_netlink_message_close_container(req);
if (r < 0)
return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
link_netlink_destroy_callback, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
link->setting_genmode = true;
return 0;
}
static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0)
/* we warn but don't fail the link, as it may be brought up later */
log_link_message_warning_errno(link, m, r, "Could not bring up interface");
return 1;
}
static int link_up(Link *link) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(link);
assert(link->network);
assert(link->manager);
assert(link->manager->rtnl);
log_link_debug(link, "Bringing link up");
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
if (r < 0)
return log_link_error_errno(link, r, "Could not set link flags: %m");
r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
link_netlink_destroy_callback, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0)
log_link_message_warning_errno(link, m, r, "Could not bring down interface");
return 1;
}
int link_down(Link *link, link_netlink_message_handler_t callback) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
log_link_debug(link, "Bringing link down");
r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
RTM_SETLINK, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
if (r < 0)
return log_link_error_errno(link, r, "Could not set link flags: %m");
r = netlink_call_async(link->manager->rtnl, NULL, req,
callback ?: link_down_handler,
link_netlink_destroy_callback, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0)
log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
return 1;
}
static int link_set_group(Link *link) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(link);
assert(link->network);
assert(link->manager);
assert(link->manager->rtnl);
if (link->network->group <= 0)
return 0;
log_link_debug(link, "Setting group");
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
if (r < 0)
return log_link_error_errno(link, r, "Could not set link group: %m");
r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
link_netlink_destroy_callback, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
static int link_tx_rx_queues_hadler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0)
log_link_message_warning_errno(link, m, r, "Could not set transmit / receive queues for the interface");
return 1;
}
static int link_set_tx_rx_queues(Link *link) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(link);
assert(link->network);
assert(link->manager);
assert(link->manager->rtnl);
if (link->network->txqueues == 0 && link->network->rxqueues == 0)
return 0;
log_link_debug(link, "Setting transmit / receive queues");
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
if (link->network->txqueues > 0) {
r = sd_netlink_message_append_u32(req, IFLA_NUM_TX_QUEUES, link->network->txqueues);
if (r < 0)
return log_link_error_errno(link, r, "Could not set link transmit queues: %m");
}
if (link->network->rxqueues > 0) {
r = sd_netlink_message_append_u32(req, IFLA_NUM_RX_QUEUES, link->network->rxqueues);
if (r < 0)
return log_link_error_errno(link, r, "Could not set link receive queues: %m");
}
r = netlink_call_async(link->manager->rtnl, NULL, req, link_tx_rx_queues_hadler,
link_netlink_destroy_callback, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
static int link_handle_bound_to_list(Link *link) {
Link *l;
int r;
bool required_up = false;
bool link_is_up = false;
assert(link);
if (hashmap_isempty(link->bound_to_links))
return 0;
if (link->flags & IFF_UP)
link_is_up = true;
HASHMAP_FOREACH (l, link->bound_to_links)
if (link_has_carrier(l)) {
required_up = true;
break;
}
if (!required_up && link_is_up) {
r = link_down(link, NULL);
if (r < 0)
return r;
} else if (required_up && !link_is_up) {
r = link_up(link);
if (r < 0)
return r;
}
return 0;
}
static int link_handle_bound_by_list(Link *link) {
Link *l;
int r;
assert(link);
if (hashmap_isempty(link->bound_by_links))
return 0;
HASHMAP_FOREACH (l, link->bound_by_links) {
r = link_handle_bound_to_list(l);
if (r < 0)
return r;
}
return 0;
}
static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
int r;
assert(link);
assert(carrier);
if (link == carrier)
return 0;
if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
return 0;
r = hashmap_ensure_allocated(h, NULL);
if (r < 0)
return r;
r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
if (r < 0)
return r;
return 0;
}
static int link_new_bound_by_list(Link *link) {
Manager *m;
Link *carrier;
int r;
bool list_updated = false;
assert(link);
assert(link->manager);
m = link->manager;
HASHMAP_FOREACH(carrier, m->links) {
if (!carrier->network)
continue;
if (strv_isempty(carrier->network->bind_carrier))
continue;
if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
r = link_put_carrier(link, carrier, &link->bound_by_links);
if (r < 0)
return r;
list_updated = true;
}
}
if (list_updated)
link_dirty(link);
HASHMAP_FOREACH(carrier, link->bound_by_links) {
r = link_put_carrier(carrier, link, &carrier->bound_to_links);
if (r < 0)
return r;
link_dirty(carrier);
}
return 0;
}
static int link_new_bound_to_list(Link *link) {
Manager *m;
Link *carrier;
int r;
bool list_updated = false;
assert(link);
assert(link->manager);
if (!link->network)
return 0;
if (strv_isempty(link->network->bind_carrier))
return 0;
m = link->manager;
HASHMAP_FOREACH (carrier, m->links) {
if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
r = link_put_carrier(link, carrier, &link->bound_to_links);
if (r < 0)
return r;
list_updated = true;
}
}
if (list_updated)
link_dirty(link);
HASHMAP_FOREACH (carrier, link->bound_to_links) {
r = link_put_carrier(carrier, link, &carrier->bound_by_links);
if (r < 0)
return r;
link_dirty(carrier);
}
return 0;
}
static int link_new_carrier_maps(Link *link) {
int r;
r = link_new_bound_by_list(link);
if (r < 0)
return r;
r = link_handle_bound_by_list(link);
if (r < 0)
return r;
r = link_new_bound_to_list(link);
if (r < 0)
return r;
r = link_handle_bound_to_list(link);
if (r < 0)
return r;
return 0;
}
static void link_free_bound_to_list(Link *link) {
Link *bound_to;
HASHMAP_FOREACH (bound_to, link->bound_to_links) {
hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
link_dirty(bound_to);
}
return;
}
static void link_free_bound_by_list(Link *link) {
Link *bound_by;
HASHMAP_FOREACH (bound_by, link->bound_by_links) {
hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
link_dirty(bound_by);
link_handle_bound_to_list(bound_by);
}
}
return;
}
static void link_free_carrier_maps(Link *link) {
bool list_updated = false;
assert(link);
if (!hashmap_isempty(link->bound_to_links)) {
link_free_bound_to_list(link);
list_updated = true;
}
if (!hashmap_isempty(link->bound_by_links)) {
link_free_bound_by_list(link);
list_updated = true;
}
if (list_updated)
link_dirty(link);
return;
}
static int link_append_to_master(Link *link, NetDev *netdev) {
Link *master;
int r;
assert(link);
assert(netdev);
r = link_get(link->manager, netdev->ifindex, &master);
if (r < 0)
return r;
r = set_ensure_put(&master->slaves, NULL, link);
if (r <= 0)
return r;
link_ref(link);
return 0;
}
static void link_drop_from_master(Link *link, NetDev *netdev) {
Link *master;
assert(link);
if (!link->manager || !netdev)
return;
if (link_get(link->manager, netdev->ifindex, &master) < 0)
return;
link_unref(set_remove(master->slaves, link));
}
static void link_detach_from_manager(Link *link) {
if (!link || !link->manager)
return;
link_unref(set_remove(link->manager->links_requesting_uuid, link));
link_clean(link);
/* The following must be called at last. */
assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
link_unref(link);
}
void link_drop(Link *link) {
if (!link || link->state == LINK_STATE_LINGER)
return;
link_set_state(link, LINK_STATE_LINGER);
link_free_carrier_maps(link);
if (link->network) {
link_drop_from_master(link, link->network->bridge);
link_drop_from_master(link, link->network->bond);
}
log_link_debug(link, "Link removed");
(void) unlink(link->state_file);
link_detach_from_manager(link);
}
static int link_joined(Link *link) {
int r;
assert(link);
assert(link->network);
if (!hashmap_isempty(link->bound_to_links)) {
r = link_handle_bound_to_list(link);
if (r < 0)
return r;
} else if (!(link->flags & IFF_UP)) {
r = link_up(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
if (link->network->bridge) {
r = link_set_bridge(link);
if (r < 0)
log_link_error_errno(link, r, "Could not set bridge message: %m");
r = link_append_to_master(link, link->network->bridge);
if (r < 0)
log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
}
if (link->network->bond) {
r = link_set_bond(link);
if (r < 0)
log_link_error_errno(link, r, "Could not set bond message: %m");
r = link_append_to_master(link, link->network->bond);
if (r < 0)
log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
}
r = link_set_bridge_vlan(link);
if (r < 0)
log_link_error_errno(link, r, "Could not set bridge vlan: %m");
/* Skip setting up addresses until it gets carrier,
or it would try to set addresses twice,
which is bad for non-idempotent steps. */
if (!link_has_carrier(link) && !link->network->configure_without_carrier)
return 0;
link_set_state(link, LINK_STATE_CONFIGURING);
r = link_acquire_conf(link);
if (r < 0)
return r;
return link_set_static_configs(link);
}
static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->enslaving > 0);
link->enslaving--;
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_link_message_warning_errno(link, m, r, "Could not join netdev");
link_enter_failed(link);
return 1;
}
log_link_debug(link, "Joined netdev");
if (link->enslaving == 0) {
r = link_joined(link);
if (r < 0)
link_enter_failed(link);
}
return 1;
}
static int link_enter_join_netdev(Link *link) {
NetDev *netdev;
int r;
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_INITIALIZED);
link_set_state(link, LINK_STATE_CONFIGURING);
link_dirty(link);
link->enslaving = 0;
if (link->network->bond) {
if (link->network->bond->state == NETDEV_STATE_READY &&
link->network->bond->ifindex == link->master_ifindex)
return link_joined(link);
log_struct(LOG_DEBUG,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(link->network->bond),
LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
link->enslaving++;
r = netdev_join(link->network->bond, link, netdev_join_handler);
if (r < 0) {
log_struct_errno(LOG_WARNING, r,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(link->network->bond),
LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
link_enter_failed(link);
return r;
}
}
if (link->network->bridge) {
log_struct(LOG_DEBUG,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(link->network->bridge),
LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
link->enslaving++;
r = netdev_join(link->network->bridge, link, netdev_join_handler);
if (r < 0) {
log_struct_errno(LOG_WARNING, r,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(link->network->bridge),
LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
link_enter_failed(link);
return r;
}
}
if (link->network->vrf) {
log_struct(LOG_DEBUG,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(link->network->vrf),
LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
link->enslaving++;
r = netdev_join(link->network->vrf, link, netdev_join_handler);
if (r < 0) {
log_struct_errno(LOG_WARNING, r,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(link->network->vrf),
LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
link_enter_failed(link);
return r;
}
}
HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
if (netdev->ifindex > 0)
/* Assume already enslaved. */
continue;
if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
continue;
log_struct(LOG_DEBUG,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(netdev),
LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
link->enslaving++;
r = netdev_join(netdev, link, netdev_join_handler);
if (r < 0) {
log_struct_errno(LOG_WARNING, r,
LOG_LINK_INTERFACE(link),
LOG_NETDEV_INTERFACE(netdev),
LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
link_enter_failed(link);
return r;
}
}
if (link->enslaving == 0)
return link_joined(link);
return 0;
}
static int link_drop_foreign_config(Link *link) {
int k, r;
assert(link);
assert(link->manager);
r = link_drop_foreign_addresses(link);
k = link_drop_foreign_neighbors(link);
if (k < 0 && r >= 0)
r = k;
k = link_drop_foreign_routes(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_addresses(link);
k = link_drop_neighbors(link);
if (k < 0 && r >= 0)
r = k;
k = link_drop_routes(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;
}
int link_configure(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_INITIALIZED);
r = link_configure_traffic_control(link);
if (r < 0)
return r;
r = link_configure_sr_iov(link);
if (r < 0)
return r;
if (link->iftype == ARPHRD_CAN)
return link_configure_can(link);
r = link_set_sysctl(link);
if (r < 0)
return r;
r = link_set_ipv6_proxy_ndp_addresses(link);
if (r < 0)
return r;
r = link_set_mac(link);
if (r < 0)
return r;
r = link_set_nomaster(link);
if (r < 0)
return r;
r = link_set_flags(link);
if (r < 0)
return r;
r = link_set_group(link);
if (r < 0)
return r;
r = link_set_tx_rx_queues(link);
if (r < 0)
return r;
r = ipv4ll_configure(link);
if (r < 0)
return r;
r = dhcp4_configure(link);
if (r < 0)
return r;
r = dhcp6_configure(link);
if (r < 0)
return r;
r = ndisc_configure(link);
if (r < 0)
return r;
r = radv_configure(link);
if (r < 0)
return r;
r = link_lldp_rx_configure(link);
if (r < 0)
return r;
r = link_configure_mtu(link);
if (r < 0)
return r;
r = link_configure_addrgen_mode(link);
if (r < 0)
return r;
return link_configure_continue(link);
}
/* The configuration continues in this separate function, instead of
* including this in the above link_configure() function, for two
* reasons:
* 1) some devices reset the link when the mtu is set, which caused
* an infinite loop here in networkd; see:
* https://github.com/systemd/systemd/issues/6593
* https://github.com/systemd/systemd/issues/9831
* 2) if ipv6ll is disabled, then bringing the interface up must be
* delayed until after we get confirmation from the kernel that
* the addr_gen_mode parameter has been set (via netlink), see:
* https://github.com/systemd/systemd/issues/13882
*/
static int link_configure_continue(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_INITIALIZED);
if (link->setting_mtu || link->setting_genmode)
return 0;
/* Drop foreign config, but ignore loopback or critical devices.
* We do not want to remove loopback address or addresses used for root NFS. */
if (!(link->flags & IFF_LOOPBACK) &&
link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
r = link_drop_foreign_config(link);
if (r < 0)
return r;
}
/* The kernel resets ipv6 mtu after changing device mtu;
* we must set this here, after we've set device mtu */
r = link_set_ipv6_mtu(link);
if (r < 0)
log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface, ignoring: %m");
return link_enter_join_netdev(link);
}
static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
_cleanup_strv_free_ char **s = NULL;
Network *network;
int r;
assert(m);
r = sd_netlink_message_get_errno(m);
if (r < 0)
return r;
r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
if (r < 0 && r != -ENODATA)
return r;
strv_free_and_replace(link->alternative_names, s);
r = network_get(link->manager, link->iftype, link->sd_device,
link->ifname, link->alternative_names, link->driver,
&link->hw_addr.addr.ether, &link->permanent_mac,
link->wlan_iftype, link->ssid, &link->bssid, &network);
if (r == -ENOENT) {
link_enter_unmanaged(link);
return 0;
} else if (r == 0 && network->unmanaged) {
link_enter_unmanaged(link);
return 0;
} else if (r < 0)
return r;
if (link->network == network && !force)
return 0;
log_link_info(link, "Re-configuring with %s", network->filename);
/* Dropping old .network file */
r = link_stop_engines(link, false);
if (r < 0)
return r;
r = link_drop_config(link);
if (r < 0)
return r;
if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
r = link_drop_foreign_config(link);
if (r < 0)
return r;
}
link_free_carrier_maps(link);
link_free_engines(link);
link->network = network_unref(link->network);
link_unref(set_remove(link->manager->links_requesting_uuid, link));
/* Then, apply new .network file */
r = network_apply(network, link);
if (r < 0)
return r;
r = link_new_carrier_maps(link);
if (r < 0)
return r;
link_set_state(link, LINK_STATE_INITIALIZED);
link_dirty(link);
/* link_configure_duid() returns 0 if it requests product UUID. In that case,
* link_configure() is called later asynchronously. */
r = link_configure_duid(link);
if (r <= 0)
return r;
r = link_configure(link);
if (r < 0)
return r;
return 0;
}
static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
r = link_reconfigure_internal(link, m, false);
if (r < 0)
link_enter_failed(link);
return 1;
}
static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
r = link_reconfigure_internal(link, m, true);
if (r < 0)
link_enter_failed(link);
return 1;
}
int link_reconfigure(Link *link, bool force) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
/* When link in pending or initialized state, then link_configure() will be called. To prevent
* the function 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 = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
link->ifindex);
if (r < 0)
return r;
r = netlink_call_async(link->manager->rtnl, NULL, req,
force ? link_force_reconfigure_handler : link_reconfigure_handler,
link_netlink_destroy_callback, link);
if (r < 0)
return r;
link_ref(link);
return 1; /* 1 means the interface will be reconfigured. */
}
static int link_initialized_and_synced(Link *link) {
Network *network;
int r;
assert(link);
assert(link->ifname);
assert(link->manager);
/* We may get called either from the asynchronous netlink callback,
* or directly for link_add() if running in a container. See link_add(). */
if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
return 0;
log_link_debug(link, "Link state is up-to-date");
link_set_state(link, LINK_STATE_INITIALIZED);
r = link_new_bound_by_list(link);
if (r < 0)
return r;
r = link_handle_bound_by_list(link);
if (r < 0)
return r;
if (!link->network) {
r = wifi_get_info(link);
if (r < 0)
return r;
r = network_get(link->manager, link->iftype, link->sd_device,
link->ifname, link->alternative_names, link->driver,
&link->hw_addr.addr.ether, &link->permanent_mac,
link->wlan_iftype, link->ssid, &link->bssid, &network);
if (r == -ENOENT) {
link_enter_unmanaged(link);
return 0;
} else if (r == 0 && network->unmanaged) {
link_enter_unmanaged(link);
return 0;
} else if (r < 0)
return r;
if (link->flags & IFF_LOOPBACK) {
if (network->link_local != ADDRESS_FAMILY_NO)
log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
if (network->dhcp != ADDRESS_FAMILY_NO)
log_link_debug(link, "Ignoring DHCP clients for loopback link");
if (network->dhcp_server)
log_link_debug(link, "Ignoring DHCP server for loopback link");
}
r = network_apply(network, link);
if (r < 0)
return r;
}
r = link_new_bound_to_list(link);
if (r < 0)
return r;
/* link_configure_duid() returns 0 if it requests product UUID. In that case,
* link_configure() is called later asynchronously. */
r = link_configure_duid(link);
if (r <= 0)
return r;
r = link_configure(link);
if (r < 0)
return r;
return 0;
}
static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
_cleanup_strv_free_ char **s = NULL;
int r;
r = sd_netlink_message_get_errno(m);
if (r < 0) {
log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
link_enter_failed(link);
return 0;
}
r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
if (r < 0 && r != -ENODATA) {
link_enter_failed(link);
return 0;
}
strv_free_and_replace(link->alternative_names, s);
r = link_initialized_and_synced(link);
if (r < 0)
link_enter_failed(link);
return 1;
}
int link_initialized(Link *link, sd_device *device) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
assert(device);
if (link->state != LINK_STATE_PENDING)
return 0;
if (link->sd_device)
return 0;
log_link_debug(link, "udev initialized link");
link_set_state(link, LINK_STATE_INITIALIZED);
link->sd_device = sd_device_ref(device);
/* udev has initialized the link, but we don't know if we have yet
* processed the NEWLINK messages with the latest state. Do a GETLINK,
* when it returns we know that the pending NEWLINKs have already been
* processed and that we are up-to-date */
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
link->ifindex);
if (r < 0)
return r;
r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
link_netlink_destroy_callback, link);
if (r < 0)
return r;
link_ref(link);
return 0;
}
int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
_cleanup_(sd_device_unrefp) sd_device *device = NULL;
char ifindex_str[2 + DECIMAL_STR_MAX(int)];
Link *link;
int r;
assert(m);
assert(m->rtnl);
assert(message);
assert(ret);
r = link_new(m, message, ret);
if (r < 0)
return r;
link = *ret;
log_link_debug(link, "Link %d added", link->ifindex);
if (path_is_read_only_fs("/sys") <= 0) {
/* udev should be around */
sprintf(ifindex_str, "n%d", link->ifindex);
r = sd_device_new_from_device_id(&device, ifindex_str);
if (r < 0) {
log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
return 0;
}
r = sd_device_get_is_initialized(device);
if (r < 0) {
log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
goto failed;
}
if (r == 0) {
/* not yet ready */
log_link_debug(link, "link pending udev initialization...");
return 0;
}
r = device_is_renaming(device);
if (r < 0) {
log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
goto failed;
}
if (r > 0) {
log_link_debug(link, "Interface is being renamed, pending initialization.");
return 0;
}
r = link_initialized(link, device);
if (r < 0)
goto failed;
} else {
r = link_initialized_and_synced(link);
if (r < 0)
goto failed;
}
return 0;
failed:
link_enter_failed(link);
return r;
}
int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
int r;
assert(link);
log_link_info(link, "Gained IPv6LL");
link->ipv6ll_address = *address;
link_check_ready(link);
if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
r = link_acquire_ipv6_conf(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
return 0;
}
static int link_carrier_gained(Link *link) {
int r;
assert(link);
r = wifi_get_info(link);
if (r < 0)
return r;
if (r > 0) {
r = link_reconfigure(link, false);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
r = link_acquire_conf(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
link_set_state(link, LINK_STATE_CONFIGURING);
r = link_set_static_configs(link);
if (r < 0)
return r;
}
r = link_handle_bound_by_list(link);
if (r < 0)
return r;
if (!link->bridge_mdb_configured) {
r = link_set_bridge_mdb(link);
if (r < 0)
return r;
}
if (streq_ptr(link->kind, "bridge")) {
Link *slave;
SET_FOREACH(slave, link->slaves) {
if (slave->bridge_mdb_configured)
continue;
r = link_set_bridge_mdb(slave);
if (r < 0)
link_enter_failed(slave);
}
}
return 0;
}
static int link_carrier_lost(Link *link) {
int r;
assert(link);
if (link->network && link->network->ignore_carrier_loss)
return 0;
/* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
* setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
* configuration and stop the clients as well. */
if (link->setting_mtu)
return 0;
r = link_stop_engines(link, false);
if (r < 0) {
link_enter_failed(link);
return r;
}
r = link_drop_config(link);
if (r < 0)
return r;
if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
r = link_drop_foreign_config(link);
if (r < 0)
return r;
}
r = link_handle_bound_by_list(link);
if (r < 0)
return r;
return 0;
}
int link_carrier_reset(Link *link) {
int r;
assert(link);
if (link_has_carrier(link)) {
r = link_carrier_lost(link);
if (r < 0)
return r;
r = link_carrier_gained(link);
if (r < 0)
return r;
log_link_info(link, "Reset carrier");
}
return 0;
}
/* This is called every time an interface admin state changes to up;
* specifically, when IFF_UP flag changes from unset to set */
static int link_admin_state_up(Link *link) {
int r;
/* We set the ipv6 mtu after the device mtu, but the kernel resets
* ipv6 mtu on NETDEV_UP, so we need to reset it. The check for
* ipv6_mtu_set prevents this from trying to set it too early before
* the link->network has been setup; we only need to reset it
* here if we've already set it during normal initialization. */
if (link->ipv6_mtu_set) {
r = link_set_ipv6_mtu(link);
if (r < 0)
return r;
}
return 0;
}
int link_update(Link *link, sd_netlink_message *m) {
_cleanup_strv_free_ char **s = NULL;
hw_addr_data hw_addr;
const char *ifname;
uint32_t mtu;
bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
int old_master, r;
assert(link);
assert(link->ifname);
assert(m);
if (link->state == LINK_STATE_LINGER) {
log_link_info(link, "Link re-added");
link_set_state(link, LINK_STATE_CONFIGURING);
r = link_new_carrier_maps(link);
if (r < 0)
return r;
}
r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
if (r >= 0 && !streq(ifname, link->ifname)) {
Manager *manager = link->manager;
log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
link_drop(link);
r = link_add(manager, m, &link);
if (r < 0)
return r;
}
r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
if (r >= 0)
strv_free_and_replace(link->alternative_names, s);
r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
if (r >= 0 && mtu > 0) {
link->mtu = mtu;
if (link->original_mtu == 0) {
link->original_mtu = mtu;
log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
}
if (link->dhcp_client) {
r = sd_dhcp_client_set_mtu(link->dhcp_client,
link->mtu);
if (r < 0)
return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
}
if (link->radv) {
r = sd_radv_set_mtu(link->radv, link->mtu);
if (r < 0)
return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
}
}
/* The kernel may broadcast NEWLINK messages without the MAC address
set, simply ignore them. */
r = netlink_message_read_hw_addr(m, IFLA_ADDRESS, &hw_addr);
if (r >= 0 && (link->hw_addr.length != hw_addr.length ||
memcmp(link->hw_addr.addr.bytes, hw_addr.addr.bytes, hw_addr.length) != 0)) {
memcpy(link->hw_addr.addr.bytes, hw_addr.addr.bytes, hw_addr.length);
log_link_debug(link, "Gained new hardware address: %s", HW_ADDR_TO_STR(&hw_addr));
r = ipv4ll_update_mac(link);
if (r < 0)
return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
r = dhcp4_update_mac(link);
if (r < 0)
return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
r = dhcp6_update_mac(link);
if (r < 0)
return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
r = radv_update_mac(link);
if (r < 0)
return log_link_warning_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
if (link->ndisc) {
r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.addr.ether);
if (r < 0)
return log_link_warning_errno(link, r, "Could not update MAC for NDisc: %m");
}
r = ipv4_dad_update_mac(link);
if (r < 0)
return log_link_warning_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
}
old_master = link->master_ifindex;
(void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
link_was_admin_up = link->flags & IFF_UP;
had_carrier = link_has_carrier(link);
r = link_update_flags(link, m, old_master != link->master_ifindex);
if (r < 0)
return r;
if (!link_was_admin_up && (link->flags & IFF_UP)) {
log_link_info(link, "Link UP");
r = link_admin_state_up(link);
if (r < 0)
return r;
} else if (link_was_admin_up && !(link->flags & IFF_UP))
log_link_info(link, "Link DOWN");
r = link_update_lldp(link);
if (r < 0)
return r;
carrier_gained = !had_carrier && link_has_carrier(link);
carrier_lost = had_carrier && !link_has_carrier(link);
if (carrier_gained) {
log_link_info(link, "Gained carrier");
r = link_carrier_gained(link);
if (r < 0)
return r;
} else if (carrier_lost) {
log_link_info(link, "Lost carrier");
r = link_carrier_lost(link);
if (r < 0)
return r;
}
return 0;
}
static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
bool space = false;
Link *link;
assert(f);
assert(prefix);
if (hashmap_isempty(h))
return;
fputs(prefix, f);
HASHMAP_FOREACH(link, h) {
if (space)
fputc(' ', f);
fprintf(f, "%i", link->ifindex);
space = true;
}
fputc('\n', f);
}
static void link_save_dns(Link *link, FILE *f, struct in_addr_full **dns, unsigned n_dns, bool *space) {
for (unsigned j = 0; j < n_dns; j++) {
const char *str;
if (dns[j]->ifindex != 0 && dns[j]->ifindex != link->ifindex)
continue;
str = in_addr_full_to_string(dns[j]);
if (!str)
continue;
if (*space)
fputc(' ', f);
fputs(str, f);
*space = true;
}
}
static void serialize_addresses(
FILE *f,
const char *lvalue,
bool *space,
char **addresses,
sd_dhcp_lease *lease,
bool conditional,
sd_dhcp_lease_server_type what,
sd_dhcp6_lease *lease6,
bool conditional6,
int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
int r;
bool _space = false;
if (!space)
space = &_space;
if (lvalue)
fprintf(f, "%s=", lvalue);
fputstrv(f, addresses, NULL, space);
if (lease && conditional) {
const struct in_addr *lease_addresses;
r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
if (r > 0)
serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local);
}
if (lease6 && conditional6 && lease6_get_addr) {
const struct in6_addr *in6_addrs;
r = lease6_get_addr(lease6, &in6_addrs);
if (r > 0)
serialize_in6_addrs(f, in6_addrs, r, space);
}
if (lease6 && conditional6 && lease6_get_fqdn) {
char **in6_hosts;
r = lease6_get_fqdn(lease6, &in6_hosts);
if (r > 0)
fputstrv(f, in6_hosts, NULL, space);
}
if (lvalue)
fputc('\n', f);
}
int link_save(Link *link) {
const char *admin_state, *oper_state, *carrier_state, *address_state;
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(link);
assert(link->state_file);
assert(link->lease_file);
assert(link->manager);
if (link->state == LINK_STATE_LINGER) {
(void) unlink(link->state_file);
return 0;
}
link_lldp_save(link);
admin_state = link_state_to_string(link->state);
assert(admin_state);
oper_state = link_operstate_to_string(link->operstate);
assert(oper_state);
carrier_state = link_carrier_state_to_string(link->carrier_state);
assert(carrier_state);
address_state = link_address_state_to_string(link->address_state);
assert(address_state);
r = fopen_temporary(link->state_file, &f, &temp_path);
if (r < 0)
goto fail;
(void) fchmod(fileno(f), 0644);
fprintf(f,
"# This is private data. Do not parse.\n"
"ADMIN_STATE=%s\n"
"OPER_STATE=%s\n"
"CARRIER_STATE=%s\n"
"ADDRESS_STATE=%s\n",
admin_state, oper_state, carrier_state, address_state);
if (link->network) {
char **dhcp6_domains = NULL, **dhcp_domains = NULL;
const char *dhcp_domainname = NULL, *p;
bool space;
fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
yes_no(link->network->required_for_online));
LinkOperationalStateRange st = link->network->required_operstate_for_online;
fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
strempty(link_operstate_to_string(st.min)),
st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
/************************************************************/
fputs("DNS=", f);
space = false;
if (link->n_dns != (unsigned) -1)
link_save_dns(link, f, link->dns, link->n_dns, &space);
else
link_save_dns(link, f, link->network->dns, link->network->n_dns, &space);
serialize_addresses(f, NULL, &space,
NULL,
link->dhcp_lease,
link->network->dhcp_use_dns,
SD_DHCP_LEASE_DNS,
link->dhcp6_lease,
link->network->dhcp6_use_dns,
sd_dhcp6_lease_get_dns,
NULL);
/* Make sure to flush out old entries before we use the NDisc data */
ndisc_vacuum(link);
if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
NDiscRDNSS *dd;
SET_FOREACH(dd, link->ndisc_rdnss)
serialize_in6_addrs(f, &dd->address, 1, &space);
}
fputc('\n', f);
/************************************************************/
serialize_addresses(f, "NTP", NULL,
link->ntp ?: link->network->ntp,
link->dhcp_lease,
link->network->dhcp_use_ntp,
SD_DHCP_LEASE_NTP,
link->dhcp6_lease,
link->network->dhcp6_use_ntp,
sd_dhcp6_lease_get_ntp_addrs,
sd_dhcp6_lease_get_ntp_fqdn);
serialize_addresses(f, "SIP", NULL,
NULL,
link->dhcp_lease,
link->network->dhcp_use_sip,
SD_DHCP_LEASE_SIP,
NULL, false, NULL, NULL);
/************************************************************/
if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
if (link->dhcp_lease) {
(void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
(void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
}
if (link->dhcp6_lease)
(void) sd_dhcp6_lease_get_domains(link->dhcp6_lease, &dhcp6_domains);
}
fputs("DOMAINS=", f);
space = false;
ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains)
fputs_with_space(f, p, NULL, &space);
if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
if (dhcp_domainname)
fputs_with_space(f, dhcp_domainname, NULL, &space);
if (dhcp_domains)
fputstrv(f, dhcp_domains, NULL, &space);
if (dhcp6_domains)
fputstrv(f, dhcp6_domains, NULL, &space);
}
if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
NDiscDNSSL *dd;
SET_FOREACH(dd, link->ndisc_dnssl)
fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
}
fputc('\n', f);
/************************************************************/
fputs("ROUTE_DOMAINS=", f);
space = false;
ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains)
fputs_with_space(f, p, NULL, &space);
if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
if (dhcp_domainname)
fputs_with_space(f, dhcp_domainname, NULL, &space);
if (dhcp_domains)
fputstrv(f, dhcp_domains, NULL, &space);
if (dhcp6_domains)
fputstrv(f, dhcp6_domains, NULL, &space);
}
if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
NDiscDNSSL *dd;
SET_FOREACH(dd, link->ndisc_dnssl)
fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
}
fputc('\n', f);
/************************************************************/
fprintf(f, "LLMNR=%s\n",
resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
/************************************************************/
fprintf(f, "MDNS=%s\n",
resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
/************************************************************/
int dns_default_route =
link->dns_default_route >= 0 ? link->dns_default_route :
link->network->dns_default_route;
if (dns_default_route >= 0)
fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
/************************************************************/
DnsOverTlsMode dns_over_tls_mode =
link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
link->network->dns_over_tls_mode;
if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
/************************************************************/
DnssecMode dnssec_mode =
link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
link->network->dnssec_mode;
if (dnssec_mode != _DNSSEC_MODE_INVALID)
fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
/************************************************************/
Set *nta_anchors = link->dnssec_negative_trust_anchors;
if (set_isempty(nta_anchors))
nta_anchors = link->network->dnssec_negative_trust_anchors;
if (!set_isempty(nta_anchors)) {
const char *n;
fputs("DNSSEC_NTA=", f);
space = false;
SET_FOREACH(n, nta_anchors)
fputs_with_space(f, n, NULL, &space);
fputc('\n', f);
}
}
print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
if (link->dhcp_lease) {
r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
if (r < 0)
goto fail;
fprintf(f,
"DHCP_LEASE=%s\n",
link->lease_file);
} else
(void) unlink(link->lease_file);
r = link_serialize_dhcp6_client(link, f);
if (r < 0)
goto fail;
r = fflush_and_check(f);
if (r < 0)
goto fail;
if (rename(temp_path, link->state_file) < 0) {
r = -errno;
goto fail;
}
return 0;
fail:
(void) unlink(link->state_file);
if (temp_path)
(void) unlink(temp_path);
return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
}
/* The serialized state in /run is no longer up-to-date. */
void link_dirty(Link *link) {
int r;
assert(link);
/* mark manager dirty as link is dirty */
manager_dirty(link->manager);
r = set_ensure_put(&link->manager->dirty_links, NULL, link);
if (r <= 0)
/* Ignore allocation errors and don't take another ref if the link was already dirty */
return;
link_ref(link);
}
/* The serialized state in /run is up-to-date */
void link_clean(Link *link) {
assert(link);
assert(link->manager);
link_unref(set_remove(link->manager->dirty_links, link));
}
int link_save_and_clean(Link *link) {
int r;
r = link_save(link);
if (r < 0)
return r;
link_clean(link);
return 0;
}
static const char* const link_state_table[_LINK_STATE_MAX] = {
[LINK_STATE_PENDING] = "pending",
[LINK_STATE_INITIALIZED] = "initialized",
[LINK_STATE_CONFIGURING] = "configuring",
[LINK_STATE_CONFIGURED] = "configured",
[LINK_STATE_UNMANAGED] = "unmanaged",
[LINK_STATE_FAILED] = "failed",
[LINK_STATE_LINGER] = "linger",
};
DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
const char *err_msg = NULL;
(void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
return log_link_full_errno(link, level, err,
"%s: %s%s%s%m",
msg,
strempty(err_msg),
err_msg && !endswith(err_msg, ".") ? "." : "",
err_msg ? " " : "");
}
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