diff options
Diffstat (limited to 'src/grp-network/networkd-link.c')
| -rw-r--r-- | src/grp-network/networkd-link.c | 3300 |
1 files changed, 3300 insertions, 0 deletions
diff --git a/src/grp-network/networkd-link.c b/src/grp-network/networkd-link.c new file mode 100644 index 0000000000..a021fc886f --- /dev/null +++ b/src/grp-network/networkd-link.c @@ -0,0 +1,3300 @@ +/*** + This file is part of systemd. + + Copyright 2013 Tom Gundersen <teg@jklm.no> + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <netinet/ether.h> +#include <linux/if.h> +#include <unistd.h> + +#include "alloc-util.h" +#include "bus-util.h" +#include "dhcp-lease-internal.h" +#include "fd-util.h" +#include "fileio.h" +#include "netlink-util.h" +#include "network-internal.h" +#include "networkd.h" +#include "networkd-lldp-tx.h" +#include "set.h" +#include "socket-util.h" +#include "stdio-util.h" +#include "string-table.h" +#include "udev-util.h" +#include "util.h" +#include "virt.h" + +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; + + 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; + + return link->network->link_local & ADDRESS_FAMILY_IPV6; +} + +static bool link_ipv6_enabled(Link *link) { + assert(link); + + if (!socket_ipv6_is_supported()) + return false; + + return link_dhcp6_enabled(link) || link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network); +} + +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; + + if (link->network->bridge) + 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 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); + if (r < 0) + log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m", disabled ? "disable" : "enable", link->ifname); + else { + if (disabled) + log_link_info(link, "IPv6 disabled for interface: %m"); + else + log_link_info(link, "IPv6 enabled for interface: %m"); + } + + 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; +} + +static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) { + _cleanup_link_unref_ Link *link = NULL; + uint16_t type; + const char *ifname; + int r, ifindex; + unsigned short iftype; + + assert(manager); + assert(message); + assert(ret); + + 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 = new0(Link, 1); + if (!link) + return -ENOMEM; + + link->n_ref = 1; + link->manager = manager; + link->state = LINK_STATE_PENDING; + link->rtnl_extended_attrs = true; + link->ifindex = ifindex; + link->iftype = iftype; + link->ifname = strdup(ifname); + if (!link->ifname) + return -ENOMEM; + + 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 = link; + link = NULL; + + return 0; +} + +static void link_free(Link *link) { + Address *address; + Iterator i; + Link *carrier; + + if (!link) + return; + + while (!set_isempty(link->addresses)) + address_free(set_first(link->addresses)); + + while (!set_isempty(link->addresses_foreign)) + address_free(set_first(link->addresses_foreign)); + + 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); + + sd_ipv4ll_unref(link->ipv4ll); + sd_dhcp6_client_unref(link->dhcp6_client); + sd_ndisc_unref(link->ndisc_router_discovery); + + if (link->manager) + hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)); + + free(link->ifname); + + (void)unlink(link->state_file); + free(link->state_file); + + udev_device_unref(link->udev_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); + + free(link); +} + +Link *link_unref(Link *link) { + if (!link) + return NULL; + + assert(link->n_ref > 0); + + link->n_ref--; + + if (link->n_ref > 0) + return NULL; + + link_free(link); + + return NULL; +} + +Link *link_ref(Link *link) { + if (!link) + return NULL; + + assert(link->n_ref > 0); + + link->n_ref++; + + return link; +} + +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_router_discovery) { + k = sd_ndisc_stop(link->ndisc_router_discovery); + if (k < 0) + r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %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 int link_enter_configured(Link *link) { + assert(link); + assert(link->network); + assert(link->state == LINK_STATE_SETTING_ROUTES); + + log_link_info(link, "Configured"); + + link_set_state(link, LINK_STATE_CONFIGURED); + + link_dirty(link); + + 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->static_configured) + return; + + if (link_ipv4ll_enabled(link)) + if (!link->ipv4ll_address || + !link->ipv4ll_route) + return; + + 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; + + SET_FOREACH(a, link->addresses, i) + if (!address_is_ready(a)) + return; + + if (link->state != LINK_STATE_CONFIGURED) + link_enter_configured(link); + + return; +} + +static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + int r; + + assert(link->link_messages > 0); + assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES, + LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED, + LINK_STATE_LINGER)); + + link->link_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->link_messages == 0) { + log_link_debug(link, "Routes set"); + link->static_configured = true; + link_check_ready(link); + } + + return 1; +} + +static int link_enter_set_routes(Link *link) { + Route *rt; + int r; + + assert(link); + assert(link->network); + assert(link->state == LINK_STATE_SETTING_ADDRESSES); + + link_set_state(link, LINK_STATE_SETTING_ROUTES); + + LIST_FOREACH(routes, rt, link->network->static_routes) { + 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->link_messages++; + } + + if (link->link_messages == 0) { + link->static_configured = true; + link_check_ready(link); + } else + log_link_debug(link, "Setting routes"); + + return 0; +} + +int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + 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 && r != -ESRCH) + log_link_warning_errno(link, r, "Could not drop route: %m"); + + return 1; +} + +static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + int r; + + assert(rtnl); + assert(m); + assert(link); + assert(link->ifname); + assert(link->link_messages > 0); + assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES, + LINK_STATE_FAILED, LINK_STATE_LINGER)); + + link->link_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->link_messages == 0) { + log_link_debug(link, "Addresses set"); + link_enter_set_routes(link); + } + + return 1; +} + +static int link_push_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; + char **a; + + log_debug("Copying DNS server information from %s", link->ifname); + + if (!link->network) + return 0; + + STRV_FOREACH(a, link->network->dns) { + struct in_addr ia; + + /* Only look for IPv4 addresses */ + if (inet_pton(AF_INET, *a, &ia) <= 0) + 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_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; + + 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_enter_set_addresses(Link *link) { + Address *ad; + int r; + + assert(link); + assert(link->network); + assert(link->state != _LINK_STATE_INVALID); + + link_set_state(link, LINK_STATE_SETTING_ADDRESSES); + + LIST_FOREACH(addresses, ad, link->network->static_addresses) { + r = address_configure(ad, link, address_handler, false); + if (r < 0) { + log_link_warning_errno(link, r, "Could not set addresses: %m"); + link_enter_failed(link); + return r; + } + + link->link_messages++; + } + + /* now that we can figure out a default address for the dhcp server, + start it */ + if (link_dhcp4_server_enabled(link)) { + 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_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_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) { + log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m"); + return r; + } + + 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; + } + } + + 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->link_messages == 0) + link_enter_set_routes(link); + else + log_link_debug(link, "Setting addresses"); + + return 0; +} + +int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + 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 && r != -EADDRNOTAVAIL) + log_link_warning_errno(link, r, "Could not drop address: %m"); + + return 1; +} + +static int link_set_bridge_fdb(Link *const link) { + FdbEntry *fdb_entry; + int r = 0; + + LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) { + r = fdb_entry_configure(link, fdb_entry); + if (r < 0) { + log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m"); + break; + } + } + + return r; +} + +static int link_set_proxy_arp(Link *const 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); + 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, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + int r; + + 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; + } + + return 0; +} + +static int set_hostname_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) { + _cleanup_link_unref_ Link *link = userdata; + const sd_bus_error *e; + + assert(m); + assert(link); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return 1; + + e = sd_bus_message_get_error(m); + if (e) + log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set hostname: %s", e->message); + + return 1; +} + +int link_set_hostname(Link *link, const char *hostname) { + int r; + + assert(link); + assert(link->manager); + + log_link_debug(link, "Setting transient hostname: '%s'", strna(hostname)); + + if (!link->manager->bus) { + /* TODO: replace by assert when we can rely on kdbus */ + log_link_info(link, "Not connected to system bus, ignoring transient hostname."); + return 0; + } + + r = sd_bus_call_method_async( + link->manager->bus, + NULL, + "org.freedesktop.hostname1", + "/org/freedesktop/hostname1", + "org.freedesktop.hostname1", + "SetHostname", + set_hostname_handler, + link, + "sb", + hostname, + false); + + if (r < 0) + return log_link_error_errno(link, r, "Could not set transient hostname: %m"); + + link_ref(link); + + return 0; +} + +static int set_timezone_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) { + _cleanup_link_unref_ Link *link = userdata; + const sd_bus_error *e; + + assert(m); + assert(link); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return 1; + + e = sd_bus_message_get_error(m); + if (e) + log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set timezone: %s", e->message); + + return 1; +} + +int link_set_timezone(Link *link, const char *tz) { + int r; + + assert(link); + assert(link->manager); + assert(tz); + + log_link_debug(link, "Setting system timezone: '%s'", tz); + + if (!link->manager->bus) { + log_link_info(link, "Not connected to system bus, ignoring timezone."); + return 0; + } + + r = sd_bus_call_method_async( + link->manager->bus, + NULL, + "org.freedesktop.timedate1", + "/org/freedesktop/timedate1", + "org.freedesktop.timedate1", + "SetTimezone", + set_timezone_handler, + link, + "sb", + tz, + false); + if (r < 0) + return log_link_error_errno(link, r, "Could not set timezone: %m"); + + link_ref(link); + + return 0; +} + +static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + 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 MTU: %m"); + + 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); + + 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"); + + 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 = sd_netlink_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL); + 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"); + + 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"); + + 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"); + + 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"); + + 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"); + + 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->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"); + } + + 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_call_async(link->manager->rtnl, req, link_set_handler, link, 0, NULL); + 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_dhcp6_enabled(link)) { + assert(link->dhcp6_client); + assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0); + + log_link_debug(link, "Acquiring DHCPv6 lease"); + + r = sd_dhcp6_client_set_local_address(link->dhcp6_client, &link->ipv6ll_address); + if (r < 0 && r != -EBUSY) + return log_link_warning_errno(link, r, "Could not set IPv6LL address in DHCP client: %m"); + + r = sd_dhcp6_client_start(link->dhcp6_client); + if (r < 0 && r != -EBUSY) + return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m"); + } + + if (link_ipv6_accept_ra_enabled(link)) { + assert(link->ndisc_router_discovery); + + log_link_debug(link, "Discovering IPv6 routers"); + + r = sd_ndisc_router_discovery_start(link->ndisc_router_discovery); + if (r < 0 && r != -EBUSY) + return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m"); + } + + 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_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + 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; + uint8_t ipv6ll_mode; + int r; + + assert(link); + assert(link->network); + assert(link->manager); + assert(link->manager->rtnl); + + log_link_debug(link, "Bringing link up"); + + r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex); + if (r < 0) + return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m"); + + r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP); + if (r < 0) + return log_link_error_errno(link, r, "Could not set link flags: %m"); + + 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 IPv6 not configured (no static IPv6 address and neither DHCPv6 nor IPv6LL is enabled) + for this interface then disable IPv6 else enable it. */ + (void) link_enable_ipv6(link); + + if (link->network->mtu) { + /* 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) && link->network->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"); + + link->network->mtu = IPV6_MIN_MTU; + } + + r = sd_netlink_message_append_u32(req, IFLA_MTU, link->network->mtu); + if (r < 0) + return log_link_error_errno(link, r, "Could not set MTU: %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"); + + if (link_ipv6_enabled(link)) { + /* 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"); + + ipv6ll_mode = link_ipv6ll_enabled(link) ? IN6_ADDR_GEN_MODE_EUI64 : IN6_ADDR_GEN_MODE_NONE; + 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"); + + 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 = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL); + if (r < 0) + return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); + + link_ref(link); + + return 0; +} + +static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + 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"); + + return 1; +} + +static 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 = sd_netlink_call_async(link->manager->rtnl, req, link_down_handler, link, 0, NULL); + 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_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"); + } + + return link_enter_set_addresses(link); +} + +static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + 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_ENSLAVING); + + link_dirty(link); + + if (!link->network->bridge && + !link->network->bond && + hashmap_isempty(link->network->stacked_netdevs)) + return link_joined(link); + + if (link->network->bond) { + 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), + NULL); + + 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), + NULL); + + 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), + NULL); + + 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), + NULL), + link_enter_failed(link); + return r; + } + + link->enslaving++; + } + + HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) { + + log_struct(LOG_DEBUG, + LOG_LINK_INTERFACE(link), + LOG_NETDEV_INTERFACE(netdev), + LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname), + NULL); + + 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), + NULL); + 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); + 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 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); + 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); + 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 advertisments ourselves, tell the kernel to GTFO */ + r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE); + 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); + 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); + if (r < 0) + log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m"); + + return 0; +} + +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; + + r = address_remove(address, link, link_address_remove_handler); + 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; + + r = route_remove(route, link, link_address_remove_handler); + if (r < 0) + return r; + } + + 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(Link *link) { + int r; + + assert(link); + assert(link->network); + assert(link->state == LINK_STATE_PENDING); + + /* 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_bridge_fdb(link); + if (r < 0) + return r; + + r = link_set_proxy_arp(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; + + if (link_ipv4ll_enabled(link)) { + r = ipv4ll_configure(link); + if (r < 0) + return r; + } + + if (link_dhcp4_enabled(link)) { + 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_lldp_rx_enabled(link)) { + r = sd_lldp_new(&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_has_carrier(link)) { + r = link_acquire_conf(link); + if (r < 0) + return r; + } + + return link_enter_join_netdev(link); +} + +static int link_initialized_and_synced(sd_netlink *rtnl, sd_netlink_message *m, + void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + 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->udev_device, link->ifname, + &link->mac, &network); + if (r == -ENOENT) { + link_enter_unmanaged(link); + return 1; + } 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(link->manager, network, link); + if (r < 0) + return r; + } + + r = link_new_bound_to_list(link); + if (r < 0) + return r; + + r = link_configure(link); + if (r < 0) + return r; + + return 1; +} + +int link_initialized(Link *link, struct udev_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->udev_device) + return 0; + + log_link_debug(link, "udev initialized link"); + + link->udev_device = udev_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 = sd_netlink_call_async(link->manager->rtnl, req, + link_initialized_and_synced, link, 0, NULL); + 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(link->state_file, NEWLINE, + "NETWORK_FILE", &network_file, + "ADDRESSES", &addresses, + "ROUTES", &routes, + "DHCP4_ADDRESS", &dhcp4_address, + "IPV4LL_ADDRESS", &ipv4ll_address, + NULL); + 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(link->manager, 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) { + 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 = expire; + expire = NULL; + } + } + + if (dhcp4_address) { + r = in_addr_from_string(AF_INET, dhcp4_address, &address); + if (r < 0) { + log_link_debug_errno(link, r, "Falied to parse DHCPv4 address %s: %m", dhcp4_address); + goto dhcp4_address_fail; + } + + r = sd_dhcp_client_new(&link->dhcp_client); + if (r < 0) + return log_link_error_errno(link, r, "Falied 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, "Falied to set inital 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, "Falied 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, "Falied to create IPv4LL client: %m"); + + r = sd_ipv4ll_set_address(link->ipv4ll, &address.in); + if (r < 0) + return log_link_error_errno(link, r, "Falied to set inital IPv4LL address %s: %m", ipv4ll_address); + } + +ipv4ll_address_fail: + + return 0; +} + +int link_add(Manager *m, sd_netlink_message *message, Link **ret) { + Link *link; + _cleanup_udev_device_unref_ struct udev_device *device = NULL; + char ifindex_str[2 + DECIMAL_STR_MAX(int)]; + 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); + device = udev_device_new_from_device_id(m->udev, ifindex_str); + if (!device) { + r = log_link_warning_errno(link, errno, "Could not find udev device: %m"); + goto failed; + } + + if (udev_device_get_is_initialized(device) <= 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 { + /* we are calling a callback directly, so must take a ref */ + link_ref(link); + + r = link_initialized_and_synced(m->rtnl, NULL, 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_enter_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); + + r = link_stop_clients(link); + if (r < 0) { + link_enter_failed(link); + 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) { + link_ref(link); + log_link_info(link, "Link readded"); + link_set_state(link, LINK_STATE_ENSLAVING); + + 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, "Renamed to %s", ifname); + + link_free_carrier_maps(link); + + r = free_and_strdup(&link->ifname, ifname); + if (r < 0) + return r; + + r = link_new_carrier_maps(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) { + 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) { + log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m"); + return r; + } + } + } + + /* 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) { + const DUID *duid = link_duid(link); + + 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 = sd_dhcp_client_set_iaid_duid(link->dhcp_client, + link->network->iaid, + 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 DUID/IAID in DHCP client: %m"); + } + + if (link->dhcp6_client) { + const DUID* duid = link_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"); + + 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"); + } + } + } + + 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; + + 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; + + 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; + fputstrv(f, link->network->dns, NULL, &space); + + 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); + } + } + + 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); + + if (dhcp6_lease) + (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains); + } + + fputs("DOMAINS=", f); + fputstrv(f, link->network->search_domains, NULL, &space); + + if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES && dhcp_domainname) + fputs_with_space(f, dhcp_domainname, NULL, &space); + + if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES && dhcp6_domains) + fputstrv(f, dhcp6_domains, NULL, &space); + + fputc('\n', f); + + fputs("ROUTE_DOMAINS=", f); + fputstrv(f, link->network->route_domains, NULL, NULL); + + if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE && dhcp_domainname) + fputs_with_space(f, dhcp_domainname, NULL, &space); + + if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE && dhcp6_domains) + fputstrv(f, dhcp6_domains, 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->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"/%hhu/"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); + + set_remove(link->manager->dirty_links, link); + link_unref(link); +} + +static const char* const link_state_table[_LINK_STATE_MAX] = { + [LINK_STATE_PENDING] = "pending", + [LINK_STATE_ENSLAVING] = "configuring", + [LINK_STATE_SETTING_ADDRESSES] = "configuring", + [LINK_STATE_SETTING_ROUTES] = "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); |