diff options
Diffstat (limited to 'src/network/networkd-link.c')
| -rw-r--r-- | src/network/networkd-link.c | 4184 |
1 files changed, 4184 insertions, 0 deletions
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c new file mode 100644 index 0000000..22392d7 --- /dev/null +++ b/src/network/networkd-link.c @@ -0,0 +1,4184 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ + +#include <netinet/ether.h> +#include <linux/if.h> +#include <linux/can/netlink.h> +#include <unistd.h> +#include <stdio_ext.h> + +#include "alloc-util.h" +#include "bus-util.h" +#include "dhcp-identifier.h" +#include "dhcp-lease-internal.h" +#include "env-file.h" +#include "fd-util.h" +#include "fileio.h" +#include "missing_network.h" +#include "netlink-util.h" +#include "network-internal.h" +#include "networkd-ipv6-proxy-ndp.h" +#include "networkd-lldp-tx.h" +#include "networkd-manager.h" +#include "networkd-ndisc.h" +#include "networkd-neighbor.h" +#include "networkd-radv.h" +#include "networkd-routing-policy-rule.h" +#include "set.h" +#include "socket-util.h" +#include "stdio-util.h" +#include "string-table.h" +#include "strv.h" +#include "tmpfile-util.h" +#include "util.h" +#include "virt.h" + +DUID* link_get_duid(Link *link) { + if (link->network->duid.type != _DUID_TYPE_INVALID) + return &link->network->duid; + else + return &link->manager->duid; +} + +static bool link_dhcp6_enabled(Link *link) { + assert(link); + + if (!socket_ipv6_is_supported()) + return false; + + if (link->flags & IFF_LOOPBACK) + return false; + + if (!link->network) + return false; + + return link->network->dhcp & ADDRESS_FAMILY_IPV6; +} + +static bool link_dhcp4_enabled(Link *link) { + assert(link); + + if (link->flags & IFF_LOOPBACK) + return false; + + if (!link->network) + return false; + + return link->network->dhcp & ADDRESS_FAMILY_IPV4; +} + +static bool link_dhcp4_server_enabled(Link *link) { + assert(link); + + if (link->flags & IFF_LOOPBACK) + return false; + + if (!link->network) + return false; + + return link->network->dhcp_server; +} + +static bool link_ipv4ll_enabled(Link *link) { + assert(link); + + if (link->flags & IFF_LOOPBACK) + return false; + + if (!link->network) + return false; + + if (streq_ptr(link->kind, "wireguard")) + return false; + + return link->network->link_local & ADDRESS_FAMILY_IPV4; +} + +static bool link_ipv6ll_enabled(Link *link) { + assert(link); + + if (!socket_ipv6_is_supported()) + return false; + + if (link->flags & IFF_LOOPBACK) + return false; + + if (!link->network) + return false; + + if (streq_ptr(link->kind, "wireguard")) + return false; + + return link->network->link_local & ADDRESS_FAMILY_IPV6; +} + +static bool link_ipv6_enabled(Link *link) { + assert(link); + + if (!socket_ipv6_is_supported()) + return false; + + if (link->network->bridge) + return false; + + /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */ + return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network); +} + +static bool link_radv_enabled(Link *link) { + assert(link); + + if (!link_ipv6ll_enabled(link)) + return false; + + return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE; +} + +static bool link_lldp_rx_enabled(Link *link) { + assert(link); + + if (link->flags & IFF_LOOPBACK) + return false; + + if (link->iftype != ARPHRD_ETHER) + return false; + + if (!link->network) + return false; + + /* LLDP should be handled on bridge slaves as those have a direct + * connection to their peers not on the bridge master. Linux doesn't + * even (by default) forward lldp packets to the bridge master.*/ + if (streq_ptr("bridge", link->kind)) + return false; + + return link->network->lldp_mode != LLDP_MODE_NO; +} + +static bool link_lldp_emit_enabled(Link *link) { + assert(link); + + if (link->flags & IFF_LOOPBACK) + return false; + + if (link->iftype != ARPHRD_ETHER) + return false; + + if (!link->network) + return false; + + return link->network->lldp_emit != LLDP_EMIT_NO; +} + +static bool link_ipv4_forward_enabled(Link *link) { + assert(link); + + if (link->flags & IFF_LOOPBACK) + return false; + + if (!link->network) + return false; + + if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID) + return false; + + return link->network->ip_forward & ADDRESS_FAMILY_IPV4; +} + +static bool link_ipv6_forward_enabled(Link *link) { + assert(link); + + if (!socket_ipv6_is_supported()) + return false; + + if (link->flags & IFF_LOOPBACK) + return false; + + if (!link->network) + return false; + + if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID) + return false; + + return link->network->ip_forward & ADDRESS_FAMILY_IPV6; +} + +static bool link_proxy_arp_enabled(Link *link) { + assert(link); + + if (link->flags & IFF_LOOPBACK) + return false; + + if (!link->network) + return false; + + if (link->network->proxy_arp < 0) + return false; + + return true; +} + +static bool link_ipv6_accept_ra_enabled(Link *link) { + assert(link); + + if (!socket_ipv6_is_supported()) + return false; + + if (link->flags & IFF_LOOPBACK) + return false; + + if (!link->network) + return false; + + if (!link_ipv6ll_enabled(link)) + return false; + + /* If unset use system default (enabled if local forwarding is disabled. + * disabled if local forwarding is enabled). + * If set, ignore or enforce RA independent of local forwarding state. + */ + if (link->network->ipv6_accept_ra < 0) + /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */ + return !link_ipv6_forward_enabled(link); + else if (link->network->ipv6_accept_ra > 0) + /* accept RA even if ip_forward is enabled */ + return true; + else + /* ignore RA */ + return false; +} + +static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) { + assert(link); + + if (!socket_ipv6_is_supported()) + return _IPV6_PRIVACY_EXTENSIONS_INVALID; + + if (link->flags & IFF_LOOPBACK) + return _IPV6_PRIVACY_EXTENSIONS_INVALID; + + if (!link->network) + return _IPV6_PRIVACY_EXTENSIONS_INVALID; + + return link->network->ipv6_privacy_extensions; +} + +static int link_enable_ipv6(Link *link) { + const char *p = NULL; + bool disabled; + int r; + + if (link->flags & IFF_LOOPBACK) + return 0; + + disabled = !link_ipv6_enabled(link); + + p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6"); + + r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER); + if (r < 0) + log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m", + enable_disable(!disabled), link->ifname); + else + log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled)); + + return 0; +} + +void link_update_operstate(Link *link) { + LinkOperationalState operstate; + assert(link); + + if (link->kernel_operstate == IF_OPER_DORMANT) + operstate = LINK_OPERSTATE_DORMANT; + else if (link_has_carrier(link)) { + Address *address; + uint8_t scope = RT_SCOPE_NOWHERE; + Iterator i; + + /* if we have carrier, check what addresses we have */ + SET_FOREACH(address, link->addresses, i) { + if (!address_is_ready(address)) + continue; + + if (address->scope < scope) + scope = address->scope; + } + + /* for operstate we also take foreign addresses into account */ + SET_FOREACH(address, link->addresses_foreign, i) { + if (!address_is_ready(address)) + continue; + + if (address->scope < scope) + scope = address->scope; + } + + if (scope < RT_SCOPE_SITE) + /* universally accessible addresses found */ + operstate = LINK_OPERSTATE_ROUTABLE; + else if (scope < RT_SCOPE_HOST) + /* only link or site local addresses found */ + operstate = LINK_OPERSTATE_DEGRADED; + else + /* no useful addresses found */ + operstate = LINK_OPERSTATE_CARRIER; + } else if (link->flags & IFF_UP) + operstate = LINK_OPERSTATE_NO_CARRIER; + else + operstate = LINK_OPERSTATE_OFF; + + if (link->operstate != operstate) { + link->operstate = operstate; + link_send_changed(link, "OperationalState", NULL); + link_dirty(link); + } +} + +#define FLAG_STRING(string, flag, old, new) \ + (((old ^ new) & flag) \ + ? ((old & flag) ? (" -" string) : (" +" string)) \ + : "") + +static int link_update_flags(Link *link, sd_netlink_message *m) { + unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags; + uint8_t operstate; + int r; + + assert(link); + + r = sd_rtnl_message_link_get_flags(m, &flags); + if (r < 0) + return log_link_warning_errno(link, r, "Could not get link flags: %m"); + + r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate); + if (r < 0) + /* if we got a message without operstate, take it to mean + the state was unchanged */ + operstate = link->kernel_operstate; + + if ((link->flags == flags) && (link->kernel_operstate == operstate)) + return 0; + + if (link->flags != flags) { + log_link_debug(link, "Flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s", + FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags), + FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags), + FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags), + FLAG_STRING("UP", IFF_UP, link->flags, flags), + FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags), + FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags), + FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags), + FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags), + FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags), + FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags), + FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags), + FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags), + FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags), + FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags), + FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags), + FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags), + FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags), + FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags), + FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags)); + + unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP | + IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING | + IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT | + IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL | + IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP | + IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO); + unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags); + unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags); + + /* link flags are currently at most 18 bits, let's align to + * printing 20 */ + if (unknown_flags_added) + log_link_debug(link, + "Unknown link flags gained: %#.5x (ignoring)", + unknown_flags_added); + + if (unknown_flags_removed) + log_link_debug(link, + "Unknown link flags lost: %#.5x (ignoring)", + unknown_flags_removed); + } + + link->flags = flags; + link->kernel_operstate = operstate; + + link_update_operstate(link); + + return 0; +} + +DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref); + +static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) { + _cleanup_(link_unrefp) Link *link = NULL; + uint16_t type; + const char *ifname, *kind = NULL; + int r, ifindex; + unsigned short iftype; + + 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, + .rtnl_extended_attrs = true, + .ifindex = ifindex, + .iftype = iftype, + }; + + 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 = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac); + if (r < 0) + log_link_debug_errno(link, r, "MAC address not found for new device, continuing without"); + + if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0) + return -ENOMEM; + + if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0) + return -ENOMEM; + + if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0) + return -ENOMEM; + + r = hashmap_ensure_allocated(&manager->links, NULL); + if (r < 0) + return r; + + r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link); + if (r < 0) + return r; + + r = link_update_flags(link, message); + if (r < 0) + return r; + + *ret = TAKE_PTR(link); + + return 0; +} + +static void link_detach_from_manager(Link *link) { + if (!link || !link->manager) + return; + + hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)); + set_remove(link->manager->links_requesting_uuid, link); + link_clean(link); +} + +static Link *link_free(Link *link) { + Address *address; + Link *carrier; + Route *route; + Iterator i; + + assert(link); + + while ((route = set_first(link->routes))) + route_free(route); + + while ((route = set_first(link->routes_foreign))) + route_free(route); + + link->routes = set_free(link->routes); + link->routes_foreign = set_free(link->routes_foreign); + + while ((address = set_first(link->addresses))) + address_free(address); + + while ((address = set_first(link->addresses_foreign))) + address_free(address); + + link->addresses = set_free(link->addresses); + link->addresses_foreign = set_free(link->addresses_foreign); + + while ((address = link->pool_addresses)) { + LIST_REMOVE(addresses, link->pool_addresses, address); + address_free(address); + } + + sd_dhcp_server_unref(link->dhcp_server); + sd_dhcp_client_unref(link->dhcp_client); + sd_dhcp_lease_unref(link->dhcp_lease); + + link_lldp_emit_stop(link); + + free(link->lease_file); + + sd_lldp_unref(link->lldp); + free(link->lldp_file); + + ndisc_flush(link); + + sd_ipv4ll_unref(link->ipv4ll); + sd_dhcp6_client_unref(link->dhcp6_client); + sd_ndisc_unref(link->ndisc); + sd_radv_unref(link->radv); + + link_detach_from_manager(link); + + free(link->ifname); + + free(link->kind); + + (void) unlink(link->state_file); + free(link->state_file); + + sd_device_unref(link->sd_device); + + HASHMAP_FOREACH (carrier, link->bound_to_links, i) + hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex)); + hashmap_free(link->bound_to_links); + + HASHMAP_FOREACH (carrier, link->bound_by_links, i) + hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex)); + hashmap_free(link->bound_by_links); + + 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); + assert(ret); + + link = hashmap_get(m->links, INT_TO_PTR(ifindex)); + if (!link) + return -ENODEV; + + *ret = link; + + return 0; +} + +static void link_set_state(Link *link, LinkState state) { + assert(link); + + if (link->state == state) + return; + + link->state = state; + + link_send_changed(link, "AdministrativeState", NULL); +} + +static void link_enter_unmanaged(Link *link) { + assert(link); + + log_link_debug(link, "Unmanaged"); + + link_set_state(link, LINK_STATE_UNMANAGED); + + link_dirty(link); +} + +static int link_stop_clients(Link *link) { + int r = 0, k; + + assert(link); + assert(link->manager); + assert(link->manager->event); + + if (link->dhcp_client) { + k = sd_dhcp_client_stop(link->dhcp_client); + if (k < 0) + r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m"); + } + + if (link->ipv4ll) { + k = sd_ipv4ll_stop(link->ipv4ll); + if (k < 0) + r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m"); + } + + if (link->dhcp6_client) { + k = sd_dhcp6_client_stop(link->dhcp6_client); + if (k < 0) + r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m"); + } + + if (link->ndisc) { + k = sd_ndisc_stop(link->ndisc); + if (k < 0) + r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m"); + } + + if (link->radv) { + 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); + + link_stop_clients(link); + + link_dirty(link); +} + +static Address* link_find_dhcp_server_address(Link *link) { + Address *address; + + assert(link); + assert(link->network); + + /* The first statically configured address if there is any */ + LIST_FOREACH(addresses, address, link->network->static_addresses) { + + if (address->family != AF_INET) + continue; + + if (in_addr_is_null(address->family, &address->in_addr)) + continue; + + return address; + } + + /* If that didn't work, find a suitable address we got from the pool */ + LIST_FOREACH(addresses, address, link->pool_addresses) { + if (address->family != AF_INET) + continue; + + return address; + } + + return NULL; +} + +static void link_enter_configured(Link *link) { + assert(link); + assert(link->network); + + if (link->state != LINK_STATE_CONFIGURING) + return; + + log_link_info(link, "Configured"); + + link_set_state(link, LINK_STATE_CONFIGURED); + + link_dirty(link); +} + +static int link_request_set_routing_policy_rule(Link *link) { + RoutingPolicyRule *rule, *rrule = NULL; + int r; + + assert(link); + assert(link->network); + + link_set_state(link, LINK_STATE_CONFIGURING); + link->routing_policy_rules_configured = false; + + LIST_FOREACH(rules, rule, link->network->rules) { + r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to, + rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif, + rule->protocol, &rule->sport, &rule->dport, &rrule); + if (r == 0) { + (void) routing_policy_rule_make_local(link->manager, rrule); + continue; + } + + r = routing_policy_rule_configure(rule, link, NULL, false); + if (r < 0) { + log_link_warning_errno(link, r, "Could not set routing policy rules: %m"); + link_enter_failed(link); + return r; + } + + link->routing_policy_rule_messages++; + } + + routing_policy_rule_purge(link->manager, link); + if (link->routing_policy_rule_messages == 0) { + link->routing_policy_rules_configured = true; + link_check_ready(link); + } else + log_link_debug(link, "Setting routing policy rules"); + + return 0; +} + +static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + int r; + + assert(link); + assert(link->route_messages > 0); + assert(IN_SET(link->state, LINK_STATE_CONFIGURING, + LINK_STATE_FAILED, LINK_STATE_LINGER)); + + link->route_messages--; + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return 1; + + r = sd_netlink_message_get_errno(m); + if (r < 0 && r != -EEXIST) + log_link_warning_errno(link, r, "Could not set route: %m"); + + if (link->route_messages == 0) { + log_link_debug(link, "Routes set"); + link->static_routes_configured = true; + link_check_ready(link); + } + + return 1; +} + +static int link_request_set_routes(Link *link) { + enum { + PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */ + PHASE_GATEWAY, /* Second phase: Routes with a gateway */ + _PHASE_MAX + } phase; + Route *rt; + int r; + + assert(link); + assert(link->network); + assert(link->addresses_configured); + assert(link->address_messages == 0); + assert(link->state != _LINK_STATE_INVALID); + + link_set_state(link, LINK_STATE_CONFIGURING); + link->static_routes_configured = false; + + r = link_request_set_routing_policy_rule(link); + if (r < 0) + return r; + + /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */ + for (phase = 0; phase < _PHASE_MAX; phase++) + LIST_FOREACH(routes, rt, link->network->static_routes) { + + if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY)) + continue; + + r = route_configure(rt, link, route_handler); + if (r < 0) { + log_link_warning_errno(link, r, "Could not set routes: %m"); + link_enter_failed(link); + return r; + } + + link->route_messages++; + } + + if (link->route_messages == 0) { + link->static_routes_configured = true; + link_check_ready(link); + } else + log_link_debug(link, "Setting routes"); + + return 0; +} + +void link_check_ready(Link *link) { + Address *a; + Iterator i; + + assert(link); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return; + + if (!link->network) + return; + + if (!link->addresses_configured) + return; + + if (!link->neighbors_configured) + return; + + SET_FOREACH(a, link->addresses, i) + if (!address_is_ready(a)) + return; + + if (!link->addresses_ready) { + link->addresses_ready = true; + link_request_set_routes(link); + } + + if (!link->static_routes_configured) + return; + + if (!link->routing_policy_rules_configured) + return; + + if (link_ipv4ll_enabled(link)) + if (!link->ipv4ll_address || + !link->ipv4ll_route) + return; + + if (!link->network->bridge) { + + if (link_ipv6ll_enabled(link)) + if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0) + return; + + if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) && + !link->dhcp4_configured) || + (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) && + !link->dhcp6_configured) || + (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) && + !link->dhcp4_configured && !link->dhcp6_configured)) + return; + + if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured) + return; + } + + if (link->state != LINK_STATE_CONFIGURED) + link_enter_configured(link); + + return; +} + +static int link_request_set_neighbors(Link *link) { + Neighbor *neighbor; + int r; + + assert(link); + assert(link->network); + assert(link->state != _LINK_STATE_INVALID); + + link_set_state(link, LINK_STATE_CONFIGURING); + link->neighbors_configured = false; + + LIST_FOREACH(neighbors, neighbor, link->network->neighbors) { + r = neighbor_configure(neighbor, link, NULL); + if (r < 0) { + log_link_warning_errno(link, r, "Could not set neighbor: %m"); + link_enter_failed(link); + return r; + } + } + + if (link->neighbor_messages == 0) { + link->neighbors_configured = true; + link_check_ready(link); + } else + log_link_debug(link, "Setting neighbors"); + + return 0; +} + +static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + int r; + + assert(rtnl); + assert(m); + assert(link); + assert(link->ifname); + assert(link->address_messages > 0); + assert(IN_SET(link->state, LINK_STATE_CONFIGURING, + LINK_STATE_FAILED, LINK_STATE_LINGER)); + + link->address_messages--; + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return 1; + + r = sd_netlink_message_get_errno(m); + if (r < 0 && r != -EEXIST) + log_link_warning_errno(link, r, "could not set address: %m"); + else if (r >= 0) + manager_rtnl_process_address(rtnl, m, link->manager); + + if (link->address_messages == 0) { + log_link_debug(link, "Addresses set"); + link->addresses_configured = true; + link_check_ready(link); + } + + return 1; +} + +static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) { + _cleanup_free_ struct in_addr *addresses = NULL; + size_t n_addresses = 0, n_allocated = 0; + unsigned i; + + log_debug("Copying DNS server information from %s", link->ifname); + + if (!link->network) + return 0; + + for (i = 0; i < link->network->n_dns; i++) { + struct in_addr ia; + + /* Only look for IPv4 addresses */ + if (link->network->dns[i].family != AF_INET) + continue; + + ia = link->network->dns[i].address.in; + + /* Never propagate obviously borked data */ + if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia)) + continue; + + if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1)) + return log_oom(); + + addresses[n_addresses++] = ia; + } + + if (link->network->dhcp_use_dns && link->dhcp_lease) { + const struct in_addr *da = NULL; + int n; + + n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da); + if (n > 0) { + + if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n)) + return log_oom(); + + memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr)); + n_addresses += n; + } + } + + if (n_addresses <= 0) + return 0; + + return sd_dhcp_server_set_dns(s, addresses, n_addresses); +} + +static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) { + _cleanup_free_ struct in_addr *addresses = NULL; + size_t n_addresses = 0, n_allocated = 0; + char **a; + + if (!link->network) + return 0; + + log_debug("Copying NTP server information from %s", link->ifname); + + STRV_FOREACH(a, link->network->ntp) { + struct in_addr ia; + + /* Only look for IPv4 addresses */ + if (inet_pton(AF_INET, *a, &ia) <= 0) + continue; + + /* Never propagate obviously borked data */ + if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia)) + continue; + + if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1)) + return log_oom(); + + addresses[n_addresses++] = ia; + } + + if (link->network->dhcp_use_ntp && link->dhcp_lease) { + const struct in_addr *da = NULL; + int n; + + n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da); + if (n > 0) { + + if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n)) + return log_oom(); + + memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr)); + n_addresses += n; + } + } + + if (n_addresses <= 0) + return 0; + + return sd_dhcp_server_set_ntp(s, addresses, n_addresses); +} + +static int link_set_bridge_fdb(Link *link) { + FdbEntry *fdb_entry; + int r; + + LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) { + r = fdb_entry_configure(link, fdb_entry); + if (r < 0) + return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m"); + } + + return 0; +} + +static int link_request_set_addresses(Link *link) { + AddressLabel *label; + Address *ad; + int r; + + assert(link); + assert(link->network); + assert(link->state != _LINK_STATE_INVALID); + + link_set_state(link, LINK_STATE_CONFIGURING); + + /* Reset all *_configured flags we are configuring. */ + link->addresses_configured = false; + link->addresses_ready = false; + link->neighbors_configured = false; + link->static_routes_configured = false; + link->routing_policy_rules_configured = false; + + r = link_set_bridge_fdb(link); + if (r < 0) + return r; + + r = link_request_set_neighbors(link); + if (r < 0) + return r; + + LIST_FOREACH(addresses, ad, link->network->static_addresses) { + bool update; + + update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0; + + r = address_configure(ad, link, address_handler, update); + if (r < 0) { + log_link_warning_errno(link, r, "Could not set addresses: %m"); + link_enter_failed(link); + return r; + } + + link->address_messages++; + } + + LIST_FOREACH(labels, label, link->network->address_labels) { + r = address_label_configure(label, link, NULL, false); + if (r < 0) { + log_link_warning_errno(link, r, "Could not set address label: %m"); + link_enter_failed(link); + return r; + } + + link->address_label_messages++; + } + + /* now that we can figure out a default address for the dhcp server, + start it */ + if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) { + Address *address; + Link *uplink = NULL; + bool acquired_uplink = false; + + address = link_find_dhcp_server_address(link); + if (!address) { + log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance."); + link_enter_failed(link); + return 0; + } + + /* use the server address' subnet as the pool */ + r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen, + link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size); + if (r < 0) + return r; + + /* TODO: + r = sd_dhcp_server_set_router(link->dhcp_server, + &main_address->in_addr.in); + if (r < 0) + return r; + */ + + if (link->network->dhcp_server_max_lease_time_usec > 0) { + r = sd_dhcp_server_set_max_lease_time( + link->dhcp_server, + DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC)); + if (r < 0) + return r; + } + + if (link->network->dhcp_server_default_lease_time_usec > 0) { + r = sd_dhcp_server_set_default_lease_time( + link->dhcp_server, + DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC)); + if (r < 0) + return r; + } + + if (link->network->dhcp_server_emit_dns) { + + if (link->network->n_dhcp_server_dns > 0) + r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns); + else { + uplink = manager_find_uplink(link->manager, link); + acquired_uplink = true; + + if (!uplink) { + log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink."); + r = 0; + } else + r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server); + } + if (r < 0) + log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m"); + } + + if (link->network->dhcp_server_emit_ntp) { + + if (link->network->n_dhcp_server_ntp > 0) + r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp); + else { + if (!acquired_uplink) + uplink = manager_find_uplink(link->manager, link); + + if (!uplink) { + log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink."); + r = 0; + } else + r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server); + + } + if (r < 0) + log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m"); + } + + r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m"); + + if (link->network->dhcp_server_emit_timezone) { + _cleanup_free_ char *buffer = NULL; + const char *tz = NULL; + + if (link->network->dhcp_server_timezone) + tz = link->network->dhcp_server_timezone; + else { + r = get_timezone(&buffer); + if (r < 0) + log_warning_errno(r, "Failed to determine timezone: %m"); + else + tz = buffer; + } + + if (tz) { + r = sd_dhcp_server_set_timezone(link->dhcp_server, tz); + if (r < 0) + return r; + } + } + if (!sd_dhcp_server_is_running(link->dhcp_server)) { + r = sd_dhcp_server_start(link->dhcp_server); + if (r < 0) { + log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m"); + + link_enter_failed(link); + + return 0; + } + } + + log_link_debug(link, "Offering DHCPv4 leases"); + } + + if (link->address_messages == 0) { + link->addresses_configured = true; + link_check_ready(link); + } else + log_link_debug(link, "Setting addresses"); + + return 0; +} + +static int link_set_bridge_vlan(Link *link) { + int r = 0; + + r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap); + if (r < 0) + log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m"); + + return r; +} + +static int link_set_proxy_arp(Link *link) { + const char *p = NULL; + int r; + + if (!link_proxy_arp_enabled(link)) + return 0; + + p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp"); + + r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER); + if (r < 0) + log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m"); + + return 0; +} + +static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + int r; + + assert(link); + + log_link_debug(link, "Set link"); + + r = sd_netlink_message_get_errno(m); + if (r < 0 && r != -EEXIST) { + log_link_error_errno(link, r, "Could not join netdev: %m"); + link_enter_failed(link); + } + + return 1; +} + +static int link_configure_after_setting_mtu(Link *link); + +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_warning_errno(link, r, "Could not set MTU: %m"); + return 1; + } + + log_link_debug(link, "Setting MTU done."); + + if (link->state == LINK_STATE_PENDING) + (void) link_configure_after_setting_mtu(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 (link->mtu == mtu || link->setting_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"); + + /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled) + * for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */ + (void) link_enable_ipv6(link); + + /* 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: %m"); + + 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 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_warning_errno(link, r, "Could not set link flags: %m"); + + return 1; +} + +static int link_set_flags(Link *link) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + unsigned ifi_change = 0; + unsigned ifi_flags = 0; + int r; + + assert(link); + assert(link->manager); + assert(link->manager->rtnl); + + if (link->flags & IFF_LOOPBACK) + return 0; + + if (!link->network) + return 0; + + if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0) + return 0; + + r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex); + if (r < 0) + return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m"); + + if (link->network->arp >= 0) { + ifi_change |= IFF_NOARP; + SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0); + } + + if (link->network->multicast >= 0) { + ifi_change |= IFF_MULTICAST; + SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast); + } + + if (link->network->allmulticast >= 0) { + ifi_change |= IFF_ALLMULTI; + SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast); + } + + r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change); + if (r < 0) + return log_link_error_errno(link, r, "Could not set link flags: %m"); + + r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler, + link_netlink_destroy_callback, link); + if (r < 0) + return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); + + link_ref(link); + + return 0; +} + +static int link_set_bridge(Link *link) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + int r; + + assert(link); + assert(link->network); + + r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex); + if (r < 0) + return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m"); + + r = sd_rtnl_message_link_set_family(req, PF_BRIDGE); + if (r < 0) + return log_link_error_errno(link, r, "Could not set message family: %m"); + + r = sd_netlink_message_open_container(req, IFLA_PROTINFO); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m"); + + if (link->network->use_bpdu >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m"); + } + + if (link->network->hairpin >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m"); + } + + if (link->network->fast_leave >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m"); + } + + if (link->network->allow_port_to_be_root >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m"); + + } + + if (link->network->unicast_flood >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m"); + } + + if (link->network->multicast_to_unicast >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m"); + } + + if (link->network->cost != 0) { + r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m"); + } + + if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) { + r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m"); + } + + r = sd_netlink_message_close_container(req); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m"); + + r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_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 r; +} + +static int link_bond_set(Link *link) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + int r; + + assert(link); + assert(link->network); + + r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex); + if (r < 0) + return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m"); + + r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK); + if (r < 0) + return log_link_error_errno(link, r, "Could not set netlink flags: %m"); + + r = sd_netlink_message_open_container(req, IFLA_LINKINFO); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m"); + + r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond"); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m"); + + if (link->network->active_slave) { + r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m"); + } + + if (link->network->primary_slave) { + r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m"); + } + + r = sd_netlink_message_close_container(req); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m"); + + r = sd_netlink_message_close_container(req); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %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 r; +} + +static int link_lldp_save(Link *link) { + _cleanup_free_ char *temp_path = NULL; + _cleanup_fclose_ FILE *f = NULL; + sd_lldp_neighbor **l = NULL; + int n = 0, r, i; + + assert(link); + assert(link->lldp_file); + + if (!link->lldp) { + (void) unlink(link->lldp_file); + return 0; + } + + r = sd_lldp_get_neighbors(link->lldp, &l); + if (r < 0) + goto finish; + if (r == 0) { + (void) unlink(link->lldp_file); + goto finish; + } + + n = r; + + r = fopen_temporary(link->lldp_file, &f, &temp_path); + if (r < 0) + goto finish; + + fchmod(fileno(f), 0644); + + for (i = 0; i < n; i++) { + const void *p; + le64_t u; + size_t sz; + + r = sd_lldp_neighbor_get_raw(l[i], &p, &sz); + if (r < 0) + goto finish; + + u = htole64(sz); + (void) fwrite(&u, 1, sizeof(u), f); + (void) fwrite(p, 1, sz, f); + } + + r = fflush_and_check(f); + if (r < 0) + goto finish; + + if (rename(temp_path, link->lldp_file) < 0) { + r = -errno; + goto finish; + } + +finish: + if (r < 0) { + (void) unlink(link->lldp_file); + if (temp_path) + (void) unlink(temp_path); + + log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file); + } + + if (l) { + for (i = 0; i < n; i++) + sd_lldp_neighbor_unref(l[i]); + free(l); + } + + return r; +} + +static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) { + Link *link = userdata; + int r; + + assert(link); + + (void) link_lldp_save(link); + + if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) { + /* If we received information about a new neighbor, restart the LLDP "fast" logic */ + + log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission."); + + r = link_lldp_emit_start(link); + if (r < 0) + log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m"); + } +} + +static int link_acquire_ipv6_conf(Link *link) { + int r; + + assert(link); + + if (link_ipv6_accept_ra_enabled(link)) { + assert(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_enabled(link)) { + 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 = sd_radv_start(link->radv); + if (r < 0 && r != -EBUSY) + return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m"); + } + + (void) dhcp6_request_prefix_delegation(link); + + return 0; +} + +static int link_acquire_ipv4_conf(Link *link) { + int r; + + assert(link); + assert(link->network); + assert(link->manager); + assert(link->manager->event); + + if (link_ipv4ll_enabled(link)) { + assert(link->ipv4ll); + + log_link_debug(link, "Acquiring IPv4 link-local address"); + + r = sd_ipv4ll_start(link->ipv4ll); + if (r < 0) + return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m"); + } + + if (link_dhcp4_enabled(link)) { + assert(link->dhcp_client); + + log_link_debug(link, "Acquiring DHCPv4 lease"); + + r = sd_dhcp_client_start(link->dhcp_client); + if (r < 0) + return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m"); + } + + return 0; +} + +static int link_acquire_conf(Link *link) { + int r; + + assert(link); + + r = link_acquire_ipv4_conf(link); + if (r < 0) + return r; + + if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) { + r = link_acquire_ipv6_conf(link); + if (r < 0) + return r; + } + + if (link_lldp_emit_enabled(link)) { + r = link_lldp_emit_start(link); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m"); + } + + return 0; +} + +bool link_has_carrier(Link *link) { + /* see Documentation/networking/operstates.txt in the kernel sources */ + + if (link->kernel_operstate == IF_OPER_UP) + return true; + + if (link->kernel_operstate == IF_OPER_UNKNOWN) + /* operstate may not be implemented, so fall back to flags */ + if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT)) + return true; + + return false; +} + +static int link_address_genmode_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_warning_errno(link, r, "Could not set address genmode for interface: %m"); + + 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); + + 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 { + const char *p = NULL; + _cleanup_free_ char *stable_secret = NULL; + + p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret"); + + /* The file may not exist. And event if it exists, when stable_secret is unset, + * then reading the file fails and EIO is returned. */ + r = read_one_line_file(p, &stable_secret); + if (r < 0) + ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64; + else + ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; + } + + 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); + + 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_warning_errno(link, r, "Could not bring up interface: %m"); + + return 1; +} + +static int link_up(Link *link) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + 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"); + + /* set it free if not enslaved with networkd */ + if (!link->network->bridge && !link->network->bond && !link->network->vrf) { + 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 = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP); + if (r < 0) + return log_link_error_errno(link, r, "Could not set link flags: %m"); + + if (link->network->mac) { + r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac); + if (r < 0) + return log_link_error_errno(link, r, "Could not set MAC address: %m"); + } + + if (link_ipv6_enabled(link)) { + r = sd_netlink_message_open_container(req, IFLA_AF_SPEC); + if (r < 0) + return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m"); + + /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */ + r = sd_netlink_message_open_container(req, AF_INET6); + if (r < 0) + return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m"); + + if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) { + r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m"); + } + + r = sd_netlink_message_close_container(req); + if (r < 0) + return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m"); + + r = sd_netlink_message_close_container(req); + if (r < 0) + return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m"); + } + + r = 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_up_can(Link *link) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + int r; + + assert(link); + + log_link_debug(link, "Bringing CAN 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_set_can(Link *link) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; + int r; + + assert(link); + assert(link->network); + assert(link->manager); + assert(link->manager->rtnl); + + log_link_debug(link, "link_set_can"); + + r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex); + if (r < 0) + return log_link_error_errno(link, r, "Failed to allocate netlink message: %m"); + + r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK); + if (r < 0) + return log_link_error_errno(link, r, "Could not set netlink flags: %m"); + + r = sd_netlink_message_open_container(m, IFLA_LINKINFO); + if (r < 0) + return log_link_error_errno(link, r, "Failed to open netlink container: %m"); + + r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m"); + + if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) { + struct can_bittiming bt = { + .bitrate = link->network->can_bitrate, + .sample_point = link->network->can_sample_point, + }; + + if (link->network->can_bitrate > UINT32_MAX) { + log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate); + return -ERANGE; + } + + log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate); + if (link->network->can_sample_point > 0) + log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10); + else + log_link_debug(link, "Using default sample point"); + + r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt)); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m"); + } + + if (link->network->can_restart_us > 0) { + char time_string[FORMAT_TIMESPAN_MAX]; + uint64_t restart_ms; + + if (link->network->can_restart_us == USEC_INFINITY) + restart_ms = 0; + else + restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC); + + format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC); + + if (restart_ms > UINT32_MAX) { + log_link_error(link, "restart timeout (%s) too big.", time_string); + return -ERANGE; + } + + log_link_debug(link, "Setting restart = %s", time_string); + + r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m"); + } + + r = sd_netlink_message_close_container(m); + if (r < 0) + return log_link_error_errno(link, r, "Failed to close netlink container: %m"); + + r = sd_netlink_message_close_container(m); + if (r < 0) + return log_link_error_errno(link, r, "Failed to close netlink container: %m"); + + r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_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); + + if (!(link->flags & IFF_UP)) { + r = link_up_can(link); + if (r < 0) { + link_enter_failed(link); + return r; + } + } + + log_link_debug(link, "link_set_can done"); + + return r; +} + +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_warning_errno(link, r, "Could not bring down interface: %m"); + + if (streq_ptr(link->kind, "can")) + link_set_can(link); + + return 1; +} + +int link_down(Link *link) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + int r; + + assert(link); + assert(link->manager); + assert(link->manager->rtnl); + + log_link_debug(link, "Bringing link down"); + + r = sd_rtnl_message_new_link(link->manager->rtnl, &req, + RTM_SETLINK, link->ifindex); + if (r < 0) + return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m"); + + r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP); + if (r < 0) + return log_link_error_errno(link, r, "Could not set link flags: %m"); + + r = netlink_call_async(link->manager->rtnl, NULL, req, 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_handle_bound_to_list(Link *link) { + Link *l; + Iterator i; + int r; + bool required_up = false; + bool link_is_up = false; + + assert(link); + + if (hashmap_isempty(link->bound_to_links)) + return 0; + + if (link->flags & IFF_UP) + link_is_up = true; + + HASHMAP_FOREACH (l, link->bound_to_links, i) + if (link_has_carrier(l)) { + required_up = true; + break; + } + + if (!required_up && link_is_up) { + r = link_down(link); + if (r < 0) + return r; + } else if (required_up && !link_is_up) { + r = link_up(link); + if (r < 0) + return r; + } + + return 0; +} + +static int link_handle_bound_by_list(Link *link) { + Iterator i; + Link *l; + int r; + + assert(link); + + if (hashmap_isempty(link->bound_by_links)) + return 0; + + HASHMAP_FOREACH (l, link->bound_by_links, i) { + r = link_handle_bound_to_list(l); + if (r < 0) + return r; + } + + return 0; +} + +static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) { + int r; + + assert(link); + assert(carrier); + + if (link == carrier) + return 0; + + if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex))) + return 0; + + r = hashmap_ensure_allocated(h, NULL); + if (r < 0) + return r; + + r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier); + if (r < 0) + return r; + + return 0; +} + +static int link_new_bound_by_list(Link *link) { + Manager *m; + Link *carrier; + Iterator i; + int r; + bool list_updated = false; + + assert(link); + assert(link->manager); + + m = link->manager; + + HASHMAP_FOREACH(carrier, m->links, i) { + if (!carrier->network) + continue; + + if (strv_isempty(carrier->network->bind_carrier)) + continue; + + if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) { + r = link_put_carrier(link, carrier, &link->bound_by_links); + if (r < 0) + return r; + + list_updated = true; + } + } + + if (list_updated) + link_dirty(link); + + HASHMAP_FOREACH(carrier, link->bound_by_links, i) { + r = link_put_carrier(carrier, link, &carrier->bound_to_links); + if (r < 0) + return r; + + link_dirty(carrier); + } + + return 0; +} + +static int link_new_bound_to_list(Link *link) { + Manager *m; + Link *carrier; + Iterator i; + int r; + bool list_updated = false; + + assert(link); + assert(link->manager); + + if (!link->network) + return 0; + + if (strv_isempty(link->network->bind_carrier)) + return 0; + + m = link->manager; + + HASHMAP_FOREACH (carrier, m->links, i) { + if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) { + r = link_put_carrier(link, carrier, &link->bound_to_links); + if (r < 0) + return r; + + list_updated = true; + } + } + + if (list_updated) + link_dirty(link); + + HASHMAP_FOREACH (carrier, link->bound_to_links, i) { + r = link_put_carrier(carrier, link, &carrier->bound_by_links); + if (r < 0) + return r; + + link_dirty(carrier); + } + + return 0; +} + +static int link_new_carrier_maps(Link *link) { + int r; + + r = link_new_bound_by_list(link); + if (r < 0) + return r; + + r = link_handle_bound_by_list(link); + if (r < 0) + return r; + + r = link_new_bound_to_list(link); + if (r < 0) + return r; + + r = link_handle_bound_to_list(link); + if (r < 0) + return r; + + return 0; +} + +static void link_free_bound_to_list(Link *link) { + Link *bound_to; + Iterator i; + + HASHMAP_FOREACH (bound_to, link->bound_to_links, i) { + hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex)); + + if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex))) + link_dirty(bound_to); + } + + return; +} + +static void link_free_bound_by_list(Link *link) { + Link *bound_by; + Iterator i; + + HASHMAP_FOREACH (bound_by, link->bound_by_links, i) { + hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex)); + + if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) { + link_dirty(bound_by); + link_handle_bound_to_list(bound_by); + } + } + + return; +} + +static void link_free_carrier_maps(Link *link) { + bool list_updated = false; + + assert(link); + + if (!hashmap_isempty(link->bound_to_links)) { + link_free_bound_to_list(link); + list_updated = true; + } + + if (!hashmap_isempty(link->bound_by_links)) { + link_free_bound_by_list(link); + list_updated = true; + } + + if (list_updated) + link_dirty(link); + + return; +} + +void link_drop(Link *link) { + if (!link || link->state == LINK_STATE_LINGER) + return; + + link_set_state(link, LINK_STATE_LINGER); + + link_free_carrier_maps(link); + + log_link_debug(link, "Link removed"); + + (void) unlink(link->state_file); + + link_detach_from_manager(link); + + link_unref(link); + + return; +} + +static int link_joined(Link *link) { + int r; + + assert(link); + assert(link->network); + + if (!hashmap_isempty(link->bound_to_links)) { + r = link_handle_bound_to_list(link); + if (r < 0) + return r; + } else if (!(link->flags & IFF_UP)) { + r = link_up(link); + if (r < 0) { + link_enter_failed(link); + return r; + } + } + + if (link->network->bridge) { + r = link_set_bridge(link); + if (r < 0) + log_link_error_errno(link, r, "Could not set bridge message: %m"); + } + + if (link->network->bond) { + r = link_bond_set(link); + if (r < 0) + log_link_error_errno(link, r, "Could not set bond message: %m"); + } + + if (link->network->use_br_vlan && + (link->network->bridge || streq_ptr("bridge", link->kind))) { + 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; + + return link_request_set_addresses(link); +} + +static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + int r; + + assert(link); + assert(link->network); + + link->enslaving--; + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return 1; + + r = sd_netlink_message_get_errno(m); + if (r < 0 && r != -EEXIST) { + log_link_error_errno(link, r, "Could not join netdev: %m"); + link_enter_failed(link); + return 1; + } else + log_link_debug(link, "Joined netdev"); + + if (link->enslaving <= 0) + link_joined(link); + + return 1; +} + +static int link_enter_join_netdev(Link *link) { + NetDev *netdev; + Iterator i; + int r; + + assert(link); + assert(link->network); + assert(link->state == LINK_STATE_PENDING); + + link_set_state(link, LINK_STATE_CONFIGURING); + + link_dirty(link); + + if (!link->network->bridge && + !link->network->bond && + !link->network->vrf && + hashmap_isempty(link->network->stacked_netdevs)) + return link_joined(link); + + 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)); + + 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; + } + + link->enslaving++; + } + + if (link->network->bridge) { + log_struct(LOG_DEBUG, + LOG_LINK_INTERFACE(link), + LOG_NETDEV_INTERFACE(link->network->bridge), + LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname)); + + 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; + } + + link->enslaving++; + } + + 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)); + + 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; + } + + link->enslaving++; + } + + HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) { + + if (netdev->ifindex > 0) { + link_joined(link); + 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, 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; + } + + link->enslaving++; + } + + return 0; +} + +static int link_set_ipv4_forward(Link *link) { + int r; + + if (!link_ipv4_forward_enabled(link)) + return 0; + + /* We propagate the forwarding flag from one interface to the + * global setting one way. This means: as long as at least one + * interface was configured at any time that had IP forwarding + * enabled the setting will stay on for good. We do this + * primarily to keep IPv4 and IPv6 packet forwarding behaviour + * somewhat in sync (see below). */ + + r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER); + if (r < 0) + log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m"); + + return 0; +} + +static int link_set_ipv6_forward(Link *link) { + int r; + + if (!link_ipv6_forward_enabled(link)) + return 0; + + /* On Linux, the IPv6 stack does not know a per-interface + * packet forwarding setting: either packet forwarding is on + * for all, or off for all. We hence don't bother with a + * per-interface setting, but simply propagate the interface + * flag, if it is set, to the global flag, one-way. Note that + * while IPv4 would allow a per-interface flag, we expose the + * same behaviour there and also propagate the setting from + * one to all, to keep things simple (see above). */ + + r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER); + if (r < 0) + log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m"); + + return 0; +} + +static int link_set_ipv6_privacy_extensions(Link *link) { + char buf[DECIMAL_STR_MAX(unsigned) + 1]; + IPv6PrivacyExtensions s; + const char *p = NULL; + int r; + + s = link_ipv6_privacy_extensions(link); + if (s < 0) + return 0; + + p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr"); + xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions); + + r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER); + if (r < 0) + log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m"); + + return 0; +} + +static int link_set_ipv6_accept_ra(Link *link) { + const char *p = NULL; + int r; + + /* Make this a NOP if IPv6 is not available */ + if (!socket_ipv6_is_supported()) + return 0; + + if (link->flags & IFF_LOOPBACK) + return 0; + + if (!link->network) + return 0; + + p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra"); + + /* We handle router advertisements ourselves, tell the kernel to GTFO */ + r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER); + if (r < 0) + log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m"); + + return 0; +} + +static int link_set_ipv6_dad_transmits(Link *link) { + char buf[DECIMAL_STR_MAX(int) + 1]; + const char *p = NULL; + int r; + + /* Make this a NOP if IPv6 is not available */ + if (!socket_ipv6_is_supported()) + return 0; + + if (link->flags & IFF_LOOPBACK) + return 0; + + if (!link->network) + return 0; + + if (link->network->ipv6_dad_transmits < 0) + return 0; + + p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits"); + xsprintf(buf, "%i", link->network->ipv6_dad_transmits); + + r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER); + if (r < 0) + log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m"); + + return 0; +} + +static int link_set_ipv6_hop_limit(Link *link) { + char buf[DECIMAL_STR_MAX(int) + 1]; + const char *p = NULL; + int r; + + /* Make this a NOP if IPv6 is not available */ + if (!socket_ipv6_is_supported()) + return 0; + + if (link->flags & IFF_LOOPBACK) + return 0; + + if (!link->network) + return 0; + + if (link->network->ipv6_hop_limit < 0) + return 0; + + p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit"); + xsprintf(buf, "%i", link->network->ipv6_hop_limit); + + r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER); + if (r < 0) + log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m"); + + return 0; +} + +static int link_set_ipv6_mtu(Link *link) { + char buf[DECIMAL_STR_MAX(unsigned) + 1]; + const char *p = NULL; + int r; + + /* Make this a NOP if IPv6 is not available */ + if (!socket_ipv6_is_supported()) + return 0; + + if (link->flags & IFF_LOOPBACK) + return 0; + + if (link->network->ipv6_mtu == 0) + return 0; + + p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/mtu"); + + xsprintf(buf, "%" PRIu32, link->network->ipv6_mtu); + + r = write_string_file(p, buf, WRITE_STRING_FILE_DISABLE_BUFFER); + if (r < 0) + log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m"); + + return 0; +} + +static bool link_is_static_address_configured(Link *link, Address *address) { + Address *net_address; + + assert(link); + assert(address); + + if (!link->network) + return false; + + LIST_FOREACH(addresses, net_address, link->network->static_addresses) + if (address_equal(net_address, address)) + return true; + + return false; +} + +static bool link_is_static_route_configured(Link *link, Route *route) { + Route *net_route; + + assert(link); + assert(route); + + if (!link->network) + return false; + + LIST_FOREACH(routes, net_route, link->network->static_routes) + if (route_equal(net_route, route)) + return true; + + return false; +} + +static int link_drop_foreign_config(Link *link) { + Address *address; + Route *route; + Iterator i; + int r; + + SET_FOREACH(address, link->addresses_foreign, i) { + /* we consider IPv6LL addresses to be managed by the kernel */ + if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1) + continue; + + if (link_is_static_address_configured(link, address)) { + r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL); + if (r < 0) + return log_link_error_errno(link, r, "Failed to add address: %m"); + } else { + r = address_remove(address, link, NULL); + if (r < 0) + return r; + } + } + + SET_FOREACH(route, link->routes_foreign, i) { + /* do not touch routes managed by the kernel */ + if (route->protocol == RTPROT_KERNEL) + continue; + + if (link_is_static_route_configured(link, route)) { + r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL); + if (r < 0) + return r; + } else { + r = route_remove(route, link, NULL); + if (r < 0) + return r; + } + } + + return 0; +} + +static int link_drop_config(Link *link) { + Address *address, *pool_address; + Route *route; + Iterator i; + int r; + + SET_FOREACH(address, link->addresses, i) { + /* we consider IPv6LL addresses to be managed by the kernel */ + if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1) + continue; + + r = address_remove(address, link, NULL); + if (r < 0) + return r; + + /* If this address came from an address pool, clean up the pool */ + LIST_FOREACH(addresses, pool_address, link->pool_addresses) { + if (address_equal(address, pool_address)) { + LIST_REMOVE(addresses, link->pool_addresses, pool_address); + address_free(pool_address); + break; + } + } + } + + SET_FOREACH(route, link->routes, i) { + /* do not touch routes managed by the kernel */ + if (route->protocol == RTPROT_KERNEL) + continue; + + r = route_remove(route, link, NULL); + if (r < 0) + return r; + } + + ndisc_flush(link); + + return 0; +} + +static int link_update_lldp(Link *link) { + int r; + + assert(link); + + if (!link->lldp) + return 0; + + if (link->flags & IFF_UP) { + r = sd_lldp_start(link->lldp); + if (r > 0) + log_link_debug(link, "Started LLDP."); + } else { + r = sd_lldp_stop(link->lldp); + if (r > 0) + log_link_debug(link, "Stopped LLDP."); + } + + return r; +} + +static int link_configure_can(Link *link) { + int r; + + if (streq_ptr(link->kind, "can")) { + /* The CAN interface must be down to configure bitrate, etc... */ + if ((link->flags & IFF_UP)) { + r = link_down(link); + if (r < 0) { + link_enter_failed(link); + return r; + } + + return 0; + } + + return link_set_can(link); + } + + if (!(link->flags & IFF_UP)) { + r = link_up_can(link); + if (r < 0) { + link_enter_failed(link); + return r; + } + } + + return 0; +} + +static int link_configure(Link *link) { + int r; + + assert(link); + assert(link->network); + assert(link->state == LINK_STATE_PENDING); + + if (STRPTR_IN_SET(link->kind, "can", "vcan")) + return link_configure_can(link); + + /* Drop foreign config, but ignore loopback or critical devices. + * We do not want to remove loopback address or addresses used for root NFS. */ + if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) { + r = link_drop_foreign_config(link); + if (r < 0) + return r; + } + + r = link_set_proxy_arp(link); + if (r < 0) + return r; + + r = ipv6_proxy_ndp_addresses_configure(link); + if (r < 0) + return r; + + r = link_set_ipv4_forward(link); + if (r < 0) + return r; + + r = link_set_ipv6_forward(link); + if (r < 0) + return r; + + r = link_set_ipv6_privacy_extensions(link); + if (r < 0) + return r; + + r = link_set_ipv6_accept_ra(link); + if (r < 0) + return r; + + r = link_set_ipv6_dad_transmits(link); + if (r < 0) + return r; + + r = link_set_ipv6_hop_limit(link); + if (r < 0) + return r; + + r = link_set_flags(link); + if (r < 0) + return r; + + r = link_set_ipv6_mtu(link); + if (r < 0) + return r; + + if (link_ipv4ll_enabled(link)) { + r = ipv4ll_configure(link); + if (r < 0) + return r; + } + + if (link_dhcp4_enabled(link)) { + r = dhcp4_set_promote_secondaries(link); + if (r < 0) + return r; + + r = dhcp4_configure(link); + if (r < 0) + return r; + } + + if (link_dhcp4_server_enabled(link)) { + r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex); + if (r < 0) + return r; + + r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0); + if (r < 0) + return r; + } + + if (link_dhcp6_enabled(link) || + link_ipv6_accept_ra_enabled(link)) { + r = dhcp6_configure(link); + if (r < 0) + return r; + } + + if (link_ipv6_accept_ra_enabled(link)) { + r = ndisc_configure(link); + if (r < 0) + return r; + } + + if (link_radv_enabled(link)) { + r = radv_configure(link); + if (r < 0) + return r; + } + + if (link_lldp_rx_enabled(link)) { + r = sd_lldp_new(&link->lldp); + if (r < 0) + return r; + + r = sd_lldp_set_ifindex(link->lldp, link->ifindex); + if (r < 0) + return r; + + r = sd_lldp_match_capabilities(link->lldp, + link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ? + SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS : + SD_LLDP_SYSTEM_CAPABILITIES_ALL); + if (r < 0) + return r; + + r = sd_lldp_set_filter_address(link->lldp, &link->mac); + if (r < 0) + return r; + + r = sd_lldp_attach_event(link->lldp, NULL, 0); + if (r < 0) + return r; + + r = sd_lldp_set_callback(link->lldp, lldp_handler, link); + if (r < 0) + return r; + + r = link_update_lldp(link); + if (r < 0) + return r; + } + + if (link->network->mtu > 0) { + r = link_set_mtu(link, link->network->mtu); + if (r < 0) + return r; + } + + if (socket_ipv6_is_supported()) { + r = link_configure_addrgen_mode(link); + if (r < 0) + return r; + } + + return link_configure_after_setting_mtu(link); +} + +static int link_configure_after_setting_mtu(Link *link) { + int r; + + assert(link); + assert(link->network); + assert(link->state == LINK_STATE_PENDING); + + if (link->setting_mtu) + return 0; + + if (link_has_carrier(link) || link->network->configure_without_carrier) { + r = link_acquire_conf(link); + if (r < 0) + return r; + } + + return link_enter_join_netdev(link); +} + +static int duid_set_uuid(DUID *duid, sd_id128_t uuid) { + assert(duid); + + if (duid->raw_data_len > 0) + return 0; + + if (duid->type != DUID_TYPE_UUID) + return -EINVAL; + + memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t)); + duid->raw_data_len = sizeof(sd_id128_t); + + return 1; +} + +int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) { + Manager *manager = userdata; + const sd_bus_error *e; + const void *a; + size_t sz; + DUID *duid; + Link *link; + int r; + + assert(m); + assert(manager); + + e = sd_bus_message_get_error(m); + if (e) { + log_error_errno(sd_bus_error_get_errno(e), + "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s", + e->message); + goto configure; + } + + r = sd_bus_message_read_array(m, 'y', &a, &sz); + if (r < 0) + goto configure; + + if (sz != sizeof(sd_id128_t)) { + log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID."); + goto configure; + } + + memcpy(&manager->product_uuid, a, sz); + while ((duid = set_steal_first(manager->duids_requesting_uuid))) + (void) duid_set_uuid(duid, manager->product_uuid); + + manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid); + +configure: + while ((link = set_steal_first(manager->links_requesting_uuid))) { + r = link_configure(link); + if (r < 0) + log_link_error_errno(link, r, "Failed to configure link: %m"); + } + + manager->links_requesting_uuid = set_free(manager->links_requesting_uuid); + + /* To avoid calling GetProductUUID() bus method so frequently, set the flag below + * even if the method fails. */ + manager->has_product_uuid = true; + + return 1; +} + +static bool link_requires_uuid(Link *link) { + const DUID *duid; + + assert(link); + assert(link->manager); + assert(link->network); + + duid = link_get_duid(link); + if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0) + return false; + + if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY)) + return true; + + if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link)) + return true; + + return false; +} + +static int link_configure_duid(Link *link) { + Manager *m; + DUID *duid; + int r; + + assert(link); + assert(link->manager); + assert(link->network); + + m = link->manager; + duid = link_get_duid(link); + + if (!link_requires_uuid(link)) + return 1; + + if (m->has_product_uuid) { + (void) duid_set_uuid(duid, m->product_uuid); + return 1; + } + + if (!m->links_requesting_uuid) { + r = manager_request_product_uuid(m, link); + if (r < 0) { + if (r == -ENOMEM) + return r; + + log_link_warning_errno(link, r, + "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m"); + return 1; + } + } else { + r = set_put(m->links_requesting_uuid, link); + if (r < 0) + return log_oom(); + + r = set_put(m->duids_requesting_uuid, duid); + if (r < 0) + return log_oom(); + } + + return 0; +} + +static int link_initialized_and_synced(Link *link) { + Network *network; + int r; + + assert(link); + assert(link->ifname); + assert(link->manager); + + if (link->state != LINK_STATE_PENDING) + return 1; + + log_link_debug(link, "Link state is up-to-date"); + + r = link_new_bound_by_list(link); + if (r < 0) + return r; + + r = link_handle_bound_by_list(link); + if (r < 0) + return r; + + if (!link->network) { + r = network_get(link->manager, link->sd_device, link->ifname, + &link->mac, &network); + if (r == -ENOENT) { + link_enter_unmanaged(link); + return 1; + } 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 1; +} + +static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + (void) link_initialized_and_synced(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->sd_device = sd_device_ref(device); + + /* udev has initialized the link, but we don't know if we have yet + * processed the NEWLINK messages with the latest state. Do a GETLINK, + * when it returns we know that the pending NEWLINKs have already been + * processed and that we are up-to-date */ + + r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, + link->ifindex); + if (r < 0) + return r; + + r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler, + link_netlink_destroy_callback, link); + if (r < 0) + return r; + + link_ref(link); + + return 0; +} + +static int link_load(Link *link) { + _cleanup_free_ char *network_file = NULL, + *addresses = NULL, + *routes = NULL, + *dhcp4_address = NULL, + *ipv4ll_address = NULL; + union in_addr_union address; + union in_addr_union route_dst; + const char *p; + int r; + + assert(link); + + r = parse_env_file(NULL, link->state_file, + "NETWORK_FILE", &network_file, + "ADDRESSES", &addresses, + "ROUTES", &routes, + "DHCP4_ADDRESS", &dhcp4_address, + "IPV4LL_ADDRESS", &ipv4ll_address); + if (r < 0 && r != -ENOENT) + return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file); + + if (network_file) { + Network *network; + char *suffix; + + /* drop suffix */ + suffix = strrchr(network_file, '.'); + if (!suffix) { + log_link_debug(link, "Failed to get network name from %s", network_file); + goto network_file_fail; + } + *suffix = '\0'; + + r = network_get_by_name(link->manager, basename(network_file), &network); + if (r < 0) { + log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file)); + goto network_file_fail; + } + + r = network_apply(network, link); + if (r < 0) + return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file)); + } + +network_file_fail: + + if (addresses) { + p = addresses; + + for (;;) { + _cleanup_free_ char *address_str = NULL; + char *prefixlen_str; + int family; + unsigned char prefixlen; + + r = extract_first_word(&p, &address_str, NULL, 0); + if (r < 0) { + log_link_debug_errno(link, r, "Failed to extract next address string: %m"); + continue; + } + if (r == 0) + break; + + prefixlen_str = strchr(address_str, '/'); + if (!prefixlen_str) { + log_link_debug(link, "Failed to parse address and prefix length %s", address_str); + continue; + } + + *prefixlen_str++ = '\0'; + + r = sscanf(prefixlen_str, "%hhu", &prefixlen); + if (r != 1) { + log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str); + continue; + } + + r = in_addr_from_string_auto(address_str, &family, &address); + if (r < 0) { + log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str); + continue; + } + + r = address_add(link, family, &address, prefixlen, NULL); + if (r < 0) + return log_link_error_errno(link, r, "Failed to add address: %m"); + } + } + + if (routes) { + p = routes; + + for (;;) { + Route *route; + _cleanup_free_ char *route_str = NULL; + _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL; + usec_t lifetime; + char *prefixlen_str; + int family; + unsigned char prefixlen, tos, table; + uint32_t priority; + + r = extract_first_word(&p, &route_str, NULL, 0); + if (r < 0) { + log_link_debug_errno(link, r, "Failed to extract next route string: %m"); + continue; + } + if (r == 0) + break; + + prefixlen_str = strchr(route_str, '/'); + if (!prefixlen_str) { + log_link_debug(link, "Failed to parse route %s", route_str); + continue; + } + + *prefixlen_str++ = '\0'; + + r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime); + if (r != 5) { + log_link_debug(link, + "Failed to parse destination prefix length, tos, priority, table or expiration %s", + prefixlen_str); + continue; + } + + r = in_addr_from_string_auto(route_str, &family, &route_dst); + if (r < 0) { + log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str); + continue; + } + + r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route); + if (r < 0) + return log_link_error_errno(link, r, "Failed to add route: %m"); + + if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) { + r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime, + 0, route_expire_handler, route); + if (r < 0) + log_link_warning_errno(link, r, "Could not arm route expiration handler: %m"); + } + + route->lifetime = lifetime; + sd_event_source_unref(route->expire); + route->expire = TAKE_PTR(expire); + } + } + + if (dhcp4_address) { + r = in_addr_from_string(AF_INET, dhcp4_address, &address); + if (r < 0) { + log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address); + goto dhcp4_address_fail; + } + + r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0); + if (r < 0) + return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m"); + + r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in); + if (r < 0) + return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address); + } + +dhcp4_address_fail: + + if (ipv4ll_address) { + r = in_addr_from_string(AF_INET, ipv4ll_address, &address); + if (r < 0) { + log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address); + goto ipv4ll_address_fail; + } + + r = sd_ipv4ll_new(&link->ipv4ll); + if (r < 0) + return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m"); + + r = sd_ipv4ll_set_address(link->ipv4ll, &address.in); + if (r < 0) + return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address); + } + +ipv4ll_address_fail: + + return 0; +} + +int link_add(Manager *m, sd_netlink_message *message, Link **ret) { + _cleanup_(sd_device_unrefp) sd_device *device = NULL; + char ifindex_str[2 + DECIMAL_STR_MAX(int)]; + Link *link; + int r; + + assert(m); + assert(m->rtnl); + assert(message); + assert(ret); + + r = link_new(m, message, ret); + if (r < 0) + return r; + + link = *ret; + + log_link_debug(link, "Link %d added", link->ifindex); + + r = link_load(link); + if (r < 0) + return r; + + if (detect_container() <= 0) { + /* not in a container, udev will 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: %m"); + goto failed; + } + + r = sd_device_get_is_initialized(device); + if (r < 0) { + log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m"); + goto failed; + } + if (r == 0) { + /* not yet ready */ + log_link_debug(link, "link pending udev initialization..."); + return 0; + } + + r = link_initialized(link, device); + if (r < 0) + goto failed; + } else { + 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_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) { + r = link_acquire_ipv6_conf(link); + if (r < 0) { + link_enter_failed(link); + return r; + } + } + + return 0; +} + +static int link_carrier_gained(Link *link) { + int r; + + assert(link); + + if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) { + r = link_acquire_conf(link); + if (r < 0) { + link_enter_failed(link); + return r; + } + + r = link_request_set_addresses(link); + if (r < 0) + return r; + } + + r = link_handle_bound_by_list(link); + if (r < 0) + return r; + + return 0; +} + +static int link_carrier_lost(Link *link) { + int r; + + assert(link); + + /* 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_clients(link); + if (r < 0) { + link_enter_failed(link); + return r; + } + + if (link_dhcp4_server_enabled(link)) + (void) sd_dhcp_server_stop(link->dhcp_server); + + r = link_drop_config(link); + if (r < 0) + return r; + + if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) { + 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; +} + +int link_update(Link *link, sd_netlink_message *m) { + struct ether_addr mac; + const char *ifname; + uint32_t mtu; + bool had_carrier, carrier_gained, carrier_lost; + int r; + + assert(link); + assert(link->ifname); + assert(m); + + if (link->state == LINK_STATE_LINGER) { + log_link_info(link, "Link readded"); + 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)) { + log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname); + + if (link->state == LINK_STATE_PENDING) { + r = free_and_strdup(&link->ifname, ifname); + if (r < 0) + return r; + } else { + Manager *manager = link->manager; + + link_drop(link); + r = link_add(manager, m, &link); + if (r < 0) + return r; + } + } + + r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu); + if (r >= 0 && mtu > 0) { + link->mtu = mtu; + if (link->original_mtu == 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 = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac); + if (r >= 0) { + if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet, + ETH_ALEN)) { + + memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet, + ETH_ALEN); + + log_link_debug(link, "MAC address: " + "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx", + mac.ether_addr_octet[0], + mac.ether_addr_octet[1], + mac.ether_addr_octet[2], + mac.ether_addr_octet[3], + mac.ether_addr_octet[4], + mac.ether_addr_octet[5]); + + if (link->ipv4ll) { + r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac); + if (r < 0) + return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m"); + } + + if (link->dhcp_client) { + r = sd_dhcp_client_set_mac(link->dhcp_client, + (const uint8_t *) &link->mac, + sizeof (link->mac), + ARPHRD_ETHER); + if (r < 0) + return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m"); + + r = dhcp4_set_client_identifier(link); + if (r < 0) + return r; + } + + if (link->dhcp6_client) { + const DUID* duid = link_get_duid(link); + + r = sd_dhcp6_client_set_mac(link->dhcp6_client, + (const uint8_t *) &link->mac, + sizeof (link->mac), + ARPHRD_ETHER); + if (r < 0) + return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m"); + + if (link->network->iaid_set) { + r = sd_dhcp6_client_set_iaid(link->dhcp6_client, + link->network->iaid); + if (r < 0) + return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m"); + } + + r = sd_dhcp6_client_set_duid(link->dhcp6_client, + duid->type, + duid->raw_data_len > 0 ? duid->raw_data : NULL, + duid->raw_data_len); + if (r < 0) + return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m"); + } + + if (link->radv) { + r = sd_radv_set_mac(link->radv, &link->mac); + if (r < 0) + return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m"); + } + + if (link->ndisc) { + r = sd_ndisc_set_mac(link->ndisc, &link->mac); + if (r < 0) + return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m"); + } + } + } + + had_carrier = link_has_carrier(link); + + r = link_update_flags(link, m); + if (r < 0) + return r; + + r = link_update_lldp(link); + if (r < 0) + return r; + + carrier_gained = !had_carrier && link_has_carrier(link); + carrier_lost = had_carrier && !link_has_carrier(link); + + if (carrier_gained) { + log_link_info(link, "Gained carrier"); + + r = link_carrier_gained(link); + if (r < 0) + return r; + } else if (carrier_lost) { + log_link_info(link, "Lost carrier"); + + r = link_carrier_lost(link); + if (r < 0) + return r; + } + + return 0; +} + +static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) { + bool space = false; + Iterator i; + Link *link; + + assert(f); + assert(prefix); + + if (hashmap_isempty(h)) + return; + + fputs(prefix, f); + HASHMAP_FOREACH(link, h, i) { + if (space) + fputc(' ', f); + + fprintf(f, "%i", link->ifindex); + space = true; + } + + fputc('\n', f); +} + +int link_save(Link *link) { + _cleanup_free_ char *temp_path = NULL; + _cleanup_fclose_ FILE *f = NULL; + const char *admin_state, *oper_state; + Address *a; + Route *route; + Iterator i; + int r; + + assert(link); + assert(link->state_file); + assert(link->lease_file); + assert(link->manager); + + if (link->state == LINK_STATE_LINGER) { + unlink(link->state_file); + return 0; + } + + link_lldp_save(link); + + admin_state = link_state_to_string(link->state); + assert(admin_state); + + oper_state = link_operstate_to_string(link->operstate); + assert(oper_state); + + r = fopen_temporary(link->state_file, &f, &temp_path); + if (r < 0) + goto fail; + + (void) __fsetlocking(f, FSETLOCKING_BYCALLER); + (void) fchmod(fileno(f), 0644); + + fprintf(f, + "# This is private data. Do not parse.\n" + "ADMIN_STATE=%s\n" + "OPER_STATE=%s\n", + admin_state, oper_state); + + if (link->network) { + bool space; + sd_dhcp6_lease *dhcp6_lease = NULL; + const char *dhcp_domainname = NULL; + char **dhcp6_domains = NULL; + char **dhcp_domains = NULL; + unsigned j; + + fprintf(f, "REQUIRED_FOR_ONLINE=%s\n", + yes_no(link->network->required_for_online)); + + if (link->dhcp6_client) { + r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease); + if (r < 0 && r != -ENOMSG) + log_link_debug(link, "No DHCPv6 lease"); + } + + fprintf(f, "NETWORK_FILE=%s\n", link->network->filename); + + fputs("DNS=", f); + space = false; + + for (j = 0; j < link->network->n_dns; j++) { + _cleanup_free_ char *b = NULL; + + r = in_addr_to_string(link->network->dns[j].family, + &link->network->dns[j].address, &b); + if (r < 0) { + log_debug_errno(r, "Failed to format address, ignoring: %m"); + continue; + } + + if (space) + fputc(' ', f); + fputs(b, f); + space = true; + } + + if (link->network->dhcp_use_dns && + link->dhcp_lease) { + const struct in_addr *addresses; + + r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses); + if (r > 0) { + if (space) + fputc(' ', f); + serialize_in_addrs(f, addresses, r); + space = true; + } + } + + if (link->network->dhcp_use_dns && dhcp6_lease) { + struct in6_addr *in6_addrs; + + r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs); + if (r > 0) { + if (space) + fputc(' ', f); + serialize_in6_addrs(f, in6_addrs, r); + space = true; + } + } + + /* 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, i) { + if (space) + fputc(' ', f); + + serialize_in6_addrs(f, &dd->address, 1); + space = true; + } + } + + fputc('\n', f); + + fputs("NTP=", f); + space = false; + fputstrv(f, link->network->ntp, NULL, &space); + + if (link->network->dhcp_use_ntp && + link->dhcp_lease) { + const struct in_addr *addresses; + + r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses); + if (r > 0) { + if (space) + fputc(' ', f); + serialize_in_addrs(f, addresses, r); + space = true; + } + } + + if (link->network->dhcp_use_ntp && dhcp6_lease) { + struct in6_addr *in6_addrs; + char **hosts; + + r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease, + &in6_addrs); + if (r > 0) { + if (space) + fputc(' ', f); + serialize_in6_addrs(f, in6_addrs, r); + space = true; + } + + r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts); + if (r > 0) + fputstrv(f, hosts, NULL, &space); + } + + fputc('\n', f); + + if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) { + if (link->dhcp_lease) { + (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname); + (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains); + } + if (dhcp6_lease) + (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains); + } + + fputs("DOMAINS=", f); + space = false; + fputstrv(f, link->network->search_domains, NULL, &space); + + if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) { + NDiscDNSSL *dd; + + 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); + + SET_FOREACH(dd, link->ndisc_dnssl, i) + fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space); + } + + fputc('\n', f); + + fputs("ROUTE_DOMAINS=", f); + space = false; + fputstrv(f, link->network->route_domains, NULL, &space); + + if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) { + NDiscDNSSL *dd; + + 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); + + SET_FOREACH(dd, link->ndisc_dnssl, i) + fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space); + } + + fputc('\n', f); + + fprintf(f, "LLMNR=%s\n", + resolve_support_to_string(link->network->llmnr)); + fprintf(f, "MDNS=%s\n", + resolve_support_to_string(link->network->mdns)); + if (link->network->dns_default_route >= 0) + fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route)); + + if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID) + fprintf(f, "DNS_OVER_TLS=%s\n", + dns_over_tls_mode_to_string(link->network->dns_over_tls_mode)); + + if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID) + fprintf(f, "DNSSEC=%s\n", + dnssec_mode_to_string(link->network->dnssec_mode)); + + if (!set_isempty(link->network->dnssec_negative_trust_anchors)) { + const char *n; + + fputs("DNSSEC_NTA=", f); + space = false; + SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i) + fputs_with_space(f, n, NULL, &space); + fputc('\n', f); + } + + fputs("ADDRESSES=", f); + space = false; + SET_FOREACH(a, link->addresses, i) { + _cleanup_free_ char *address_str = NULL; + + r = in_addr_to_string(a->family, &a->in_addr, &address_str); + if (r < 0) + goto fail; + + fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen); + space = true; + } + fputc('\n', f); + + fputs("ROUTES=", f); + space = false; + SET_FOREACH(route, link->routes, i) { + _cleanup_free_ char *route_str = NULL; + + r = in_addr_to_string(route->family, &route->dst, &route_str); + if (r < 0) + goto fail; + + fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT, + space ? " " : "", route_str, + route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime); + space = true; + } + + fputc('\n', f); + } + + print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links); + print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links); + + if (link->dhcp_lease) { + struct in_addr address; + const char *tz = NULL; + + assert(link->network); + + r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz); + if (r >= 0) + fprintf(f, "TIMEZONE=%s\n", tz); + + r = sd_dhcp_lease_get_address(link->dhcp_lease, &address); + if (r >= 0) { + fputs("DHCP4_ADDRESS=", f); + serialize_in_addrs(f, &address, 1); + fputc('\n', f); + } + + r = dhcp_lease_save(link->dhcp_lease, link->lease_file); + if (r < 0) + goto fail; + + fprintf(f, + "DHCP_LEASE=%s\n", + link->lease_file); + } else + unlink(link->lease_file); + + if (link->ipv4ll) { + struct in_addr address; + + r = sd_ipv4ll_get_address(link->ipv4ll, &address); + if (r >= 0) { + fputs("IPV4LL_ADDRESS=", f); + serialize_in_addrs(f, &address, 1); + fputc('\n', f); + } + } + + r = fflush_and_check(f); + if (r < 0) + goto fail; + + if (rename(temp_path, link->state_file) < 0) { + r = -errno; + goto fail; + } + + return 0; + +fail: + (void) unlink(link->state_file); + if (temp_path) + (void) unlink(temp_path); + + return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file); +} + +/* The serialized state in /run is no longer up-to-date. */ +void link_dirty(Link *link) { + int r; + + assert(link); + + /* mark manager dirty as link is dirty */ + manager_dirty(link->manager); + + r = set_ensure_allocated(&link->manager->dirty_links, NULL); + if (r < 0) + /* allocation errors are ignored */ + return; + + r = set_put(link->manager->dirty_links, link); + if (r <= 0) + /* don't take another ref if the link was already dirty */ + return; + + link_ref(link); +} + +/* The serialized state in /run is up-to-date */ +void link_clean(Link *link) { + assert(link); + assert(link->manager); + + link_unref(set_remove(link->manager->dirty_links, link)); +} + +static const char* const link_state_table[_LINK_STATE_MAX] = { + [LINK_STATE_PENDING] = "pending", + [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); + +static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = { + [LINK_OPERSTATE_OFF] = "off", + [LINK_OPERSTATE_NO_CARRIER] = "no-carrier", + [LINK_OPERSTATE_DORMANT] = "dormant", + [LINK_OPERSTATE_CARRIER] = "carrier", + [LINK_OPERSTATE_DEGRADED] = "degraded", + [LINK_OPERSTATE_ROUTABLE] = "routable", +}; + +DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState); |