| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| 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 "util.h" |
| #include "virt.h" |
| #include "fileio.h" |
| #include "socket-util.h" |
| #include "bus-util.h" |
| #include "udev-util.h" |
| #include "network-internal.h" |
| #include "networkd-link.h" |
| #include "networkd-netdev.h" |
| |
| bool link_dhcp6_enabled(Link *link) { |
| if (link->flags & IFF_LOOPBACK) |
| return false; |
| |
| if (!link->network) |
| return false; |
| |
| return link->network->dhcp & ADDRESS_FAMILY_IPV6; |
| } |
| |
| bool link_dhcp4_enabled(Link *link) { |
| if (link->flags & IFF_LOOPBACK) |
| return false; |
| |
| if (!link->network) |
| return false; |
| |
| return link->network->dhcp & ADDRESS_FAMILY_IPV4; |
| } |
| |
| bool link_dhcp4_server_enabled(Link *link) { |
| if (link->flags & IFF_LOOPBACK) |
| return false; |
| |
| if (!link->network) |
| return false; |
| |
| return link->network->dhcp_server; |
| } |
| |
| bool link_ipv4ll_enabled(Link *link) { |
| if (link->flags & IFF_LOOPBACK) |
| return false; |
| |
| if (!link->network) |
| return false; |
| |
| return link->network->link_local & ADDRESS_FAMILY_IPV4; |
| } |
| |
| bool link_ipv6ll_enabled(Link *link) { |
| if (link->flags & IFF_LOOPBACK) |
| return false; |
| |
| if (!link->network) |
| return false; |
| |
| return link->network->link_local & ADDRESS_FAMILY_IPV6; |
| } |
| |
| bool link_lldp_enabled(Link *link) { |
| if (link->flags & IFF_LOOPBACK) |
| return false; |
| |
| if (!link->network) |
| return false; |
| |
| if (link->network->bridge) |
| return false; |
| |
| return link->network->lldp; |
| } |
| |
| static bool link_ipv4_forward_enabled(Link *link) { |
| if (link->flags & IFF_LOOPBACK) |
| return false; |
| |
| if (!link->network) |
| return false; |
| |
| return link->network->ip_forward & ADDRESS_FAMILY_IPV4; |
| } |
| |
| static bool link_ipv6_forward_enabled(Link *link) { |
| if (link->flags & IFF_LOOPBACK) |
| return false; |
| |
| if (!link->network) |
| return false; |
| |
| return link->network->ip_forward & ADDRESS_FAMILY_IPV6; |
| } |
| |
| #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_save(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; |
| |
| 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_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->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(link, "MAC address not found for new device, continuing without"); |
| |
| r = asprintf(&link->state_file, "/run/systemd/netif/links/%d", |
| link->ifindex); |
| if (r < 0) |
| return -ENOMEM; |
| |
| r = asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", |
| link->ifindex); |
| if (r < 0) |
| return -ENOMEM; |
| |
| r = asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", |
| link->ifindex); |
| if (r < 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 ((address = link->addresses)) { |
| LIST_REMOVE(addresses, link->addresses, address); |
| address_free(address); |
| } |
| |
| 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); |
| |
| free(link->lease_file); |
| |
| sd_lldp_free(link->lldp); |
| |
| free(link->lldp_file); |
| |
| sd_ipv4ll_unref(link->ipv4ll); |
| sd_dhcp6_client_unref(link->dhcp6_client); |
| sd_icmp6_nd_unref(link->icmp6_router_discovery); |
| |
| if (link->manager) |
| hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)); |
| |
| free(link->ifname); |
| |
| 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 && (-- link->n_ref <= 0)) |
| link_free(link); |
| |
| return NULL; |
| } |
| |
| Link *link_ref(Link *link) { |
| if (link) |
| assert_se(++ link->n_ref >= 2); |
| |
| 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); |
| |
| return; |
| } |
| |
| static void link_enter_unmanaged(Link *link) { |
| assert(link); |
| |
| log_link_debug(link, "Unmanaged"); |
| |
| link_set_state(link, LINK_STATE_UNMANAGED); |
| |
| link_save(link); |
| } |
| |
| static int link_stop_clients(Link *link) { |
| int r = 0, k; |
| |
| assert(link); |
| assert(link->manager); |
| assert(link->manager->event); |
| |
| if (!link->network) |
| return 0; |
| |
| if (link->dhcp_client) { |
| k = sd_dhcp_client_stop(link->dhcp_client); |
| if (k < 0) |
| r = log_link_warning_errno(link, r, "Could not stop DHCPv4 client: %m"); |
| } |
| |
| if (link->ipv4ll) { |
| k = sd_ipv4ll_stop(link->ipv4ll); |
| if (k < 0) |
| r = log_link_warning_errno(link, r, "Could not stop IPv4 link-local: %m"); |
| } |
| |
| if(link->icmp6_router_discovery) { |
| if (link->dhcp6_client) { |
| k = sd_dhcp6_client_stop(link->dhcp6_client); |
| if (k < 0) |
| r = log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m"); |
| } |
| |
| k = sd_icmp6_nd_stop(link->icmp6_router_discovery); |
| if (k < 0) |
| r = log_link_warning_errno(link, r, "Could not stop ICMPv6 router discovery: %m"); |
| } |
| |
| if (link->lldp) { |
| k = sd_lldp_stop(link->lldp); |
| if (k < 0) |
| r = log_link_warning_errno(link, r, "Could not stop LLDP: %m"); |
| } |
| |
| 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_save(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_save(link); |
| |
| return 0; |
| } |
| |
| void link_client_handler(Link *link) { |
| assert(link); |
| assert(link->network); |
| |
| if (!link->static_configured) |
| return; |
| |
| if (link_ipv4ll_enabled(link)) |
| if (!link->ipv4ll_address || |
| !link->ipv4ll_route) |
| return; |
| |
| if (link_dhcp4_enabled(link) && !link->dhcp4_configured) |
| 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, "%-*s: could not set route: %m", IFNAMSIZ, link->ifname); |
| |
| if (link->link_messages == 0) { |
| log_link_debug(link, "Routes set"); |
| link->static_configured = true; |
| link_client_handler(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_client_handler(link); |
| } else |
| log_link_debug(link, "Setting routes"); |
| |
| return 0; |
| } |
| |
| int link_route_drop_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, "%-*s: could not drop route: %m", IFNAMSIZ, link->ifname); |
| |
| 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, "%-*s: could not set address: %m", IFNAMSIZ, link->ifname); |
| else if (r >= 0) |
| link_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_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); |
| 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)) { |
| struct in_addr pool_start; |
| Address *address; |
| |
| 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; |
| } |
| |
| r = sd_dhcp_server_set_address(link->dhcp_server, |
| &address->in_addr.in, |
| address->prefixlen); |
| if (r < 0) |
| return r; |
| |
| /* offer 32 addresses starting from the address following the server address */ |
| pool_start.s_addr = htobe32(be32toh(address->in_addr.in.s_addr) + 1); |
| r = sd_dhcp_server_set_lease_pool(link->dhcp_server, |
| &pool_start, 32); |
| 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; |
| |
| r = sd_dhcp_server_set_prefixlen(link->dhcp_server, |
| main_address->prefixlen); |
| 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_drop_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, "%-*s: could not drop address: %m", IFNAMSIZ, link->ifname); |
| |
| 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_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; |
| int r; |
| |
| assert(m); |
| assert(link); |
| |
| if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) |
| return 1; |
| |
| r = sd_bus_message_get_errno(m); |
| if (r > 0) |
| log_link_warning_errno(link, r, "Could not set hostname: %m"); |
| |
| return 1; |
| } |
| |
| int link_set_hostname(Link *link, const char *hostname) { |
| int r = 0; |
| |
| assert(link); |
| assert(link->manager); |
| assert(hostname); |
| |
| log_link_debug(link, "Setting transient hostname: '%s'", 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_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, "%-*s: could not set MTU: %m", IFNAMSIZ, link->ifname); |
| |
| return 1; |
| } |
| |
| int link_set_mtu(Link *link, uint32_t mtu) { |
| _cleanup_netlink_message_unref_ 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_netlink_message_unref_ sd_netlink_message *req = NULL; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| |
| if(link->network->cost == 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"); |
| |
| 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->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 void lldp_handler(sd_lldp *lldp, int event, void *userdata) { |
| Link *link = userdata; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(link->manager); |
| |
| if (event != UPDATE_INFO) |
| return; |
| |
| r = sd_lldp_save(link->lldp, link->lldp_file); |
| if (r < 0) |
| log_link_warning_errno(link, r, "Could not save LLDP: %m"); |
| |
| } |
| |
| static int link_acquire_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"); |
| } |
| |
| if (link_dhcp6_enabled(link)) { |
| assert(link->icmp6_router_discovery); |
| |
| log_link_debug(link, "Discovering IPv6 routers"); |
| |
| r = sd_icmp6_router_solicitation_start(link->icmp6_router_discovery); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "Could not start IPv6 router discovery: %m"); |
| } |
| |
| if (link_lldp_enabled(link)) { |
| assert(link->lldp); |
| |
| log_link_debug(link, "Starting LLDP"); |
| |
| r = sd_lldp_start(link->lldp); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "Could not start LLDP: %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, "%-*s: could not bring up interface: %m", IFNAMSIZ, link->ifname); |
| |
| return 1; |
| } |
| |
| static int link_up(Link *link) { |
| _cleanup_netlink_message_unref_ 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 (link->network->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 (socket_ipv6_is_supported()) { |
| /* 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, "%-*s: could not bring down interface: %m", IFNAMSIZ, link->ifname); |
| |
| return 1; |
| } |
| |
| static int link_down(Link *link) { |
| _cleanup_netlink_message_unref_ 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_save(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_save(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_save(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_save(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_save(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_save(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_save(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"); |
| |
| 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, "%-*s: could not join netdev: %m", IFNAMSIZ, link->ifname); |
| 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_save(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) { |
| const char *p = NULL; |
| int r; |
| |
| if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID) |
| return 0; |
| |
| p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/forwarding"); |
| r = write_string_file_no_create(p, one_zero(link_ipv4_forward_enabled(link))); |
| if (r < 0) |
| log_link_warning_errno(link, r, "Cannot configure IPv4 forwarding for interface %s: %m", link->ifname); |
| |
| return 0; |
| } |
| |
| static int link_set_ipv6_forward(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->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID) |
| return 0; |
| |
| p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/forwarding"); |
| r = write_string_file_no_create(p, one_zero(link_ipv6_forward_enabled(link))); |
| if (r < 0) |
| log_link_warning_errno(link, r, "Cannot configure IPv6 forwarding for interface: %m"); |
| |
| return 0; |
| } |
| |
| static int link_configure(Link *link) { |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(link->state == LINK_STATE_PENDING); |
| |
| r = link_set_bridge_fdb(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; |
| |
| 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)) { |
| r = icmp6_configure(link); |
| if (r < 0) |
| return r; |
| } |
| |
| if (link_lldp_enabled(link)) { |
| r = sd_lldp_new(link->ifindex, link->ifname, &link->mac, &link->lldp); |
| 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; |
| } |
| |
| 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; |
| |
| 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_netlink_message_unref_ 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 Address* link_get_equal_address(Link *link, Address *needle) { |
| Address *i; |
| |
| assert(link); |
| assert(needle); |
| |
| LIST_FOREACH(addresses, i, link->addresses) |
| if (address_equal(i, needle)) |
| return i; |
| |
| return NULL; |
| } |
| |
| int link_rtnl_process_address(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) { |
| Manager *m = userdata; |
| Link *link = NULL; |
| uint16_t type; |
| _cleanup_address_free_ Address *address = NULL; |
| unsigned char flags; |
| Address *existing; |
| char buf[INET6_ADDRSTRLEN], valid_buf[FORMAT_TIMESPAN_MAX]; |
| const char *valid_str = NULL; |
| int r, ifindex; |
| |
| assert(rtnl); |
| assert(message); |
| assert(m); |
| |
| if (sd_netlink_message_is_error(message)) { |
| r = sd_netlink_message_get_errno(message); |
| if (r < 0) |
| log_warning_errno(r, "rtnl: failed to receive address: %m"); |
| |
| return 0; |
| } |
| |
| r = sd_netlink_message_get_type(message, &type); |
| if (r < 0) { |
| log_warning_errno(r, "rtnl: could not get message type: %m"); |
| return 0; |
| } else if (type != RTM_NEWADDR && type != RTM_DELADDR) { |
| log_warning("rtnl: received unexpected message type when processing address"); |
| return 0; |
| } |
| |
| r = sd_rtnl_message_addr_get_ifindex(message, &ifindex); |
| if (r < 0) { |
| log_warning_errno(r, "rtnl: could not get ifindex from address: %m"); |
| return 0; |
| } else if (ifindex <= 0) { |
| log_warning("rtnl: received address message with invalid ifindex: %d", ifindex); |
| return 0; |
| } else { |
| r = link_get(m, ifindex, &link); |
| if (r < 0 || !link) { |
| /* when enumerating we might be out of sync, but we will |
| * get the address again, so just ignore it */ |
| if (!m->enumerating) |
| log_warning("rtnl: received address for nonexistent link (%d), ignoring", ifindex); |
| return 0; |
| } |
| } |
| |
| r = address_new_dynamic(&address); |
| if (r < 0) |
| return r; |
| |
| r = sd_rtnl_message_addr_get_family(message, &address->family); |
| if (r < 0 || !IN_SET(address->family, AF_INET, AF_INET6)) { |
| log_link_warning(link, "rtnl: received address with invalid family, ignoring."); |
| return 0; |
| } |
| |
| r = sd_rtnl_message_addr_get_prefixlen(message, &address->prefixlen); |
| if (r < 0) { |
| log_link_warning_errno(link, r, "rtnl: received address with invalid prefixlen, ignoring: %m"); |
| return 0; |
| } |
| |
| r = sd_rtnl_message_addr_get_scope(message, &address->scope); |
| if (r < 0) { |
| log_link_warning_errno(link, r, "rtnl: received address with invalid scope, ignoring: %m"); |
| return 0; |
| } |
| |
| r = sd_rtnl_message_addr_get_flags(message, &flags); |
| if (r < 0) { |
| log_link_warning_errno(link, r, "rtnl: received address with invalid flags, ignoring: %m"); |
| return 0; |
| } |
| address->flags = flags; |
| |
| switch (address->family) { |
| case AF_INET: |
| r = sd_netlink_message_read_in_addr(message, IFA_LOCAL, &address->in_addr.in); |
| if (r < 0) { |
| log_link_warning_errno(link, r, "rtnl: received address without valid address, ignoring: %m"); |
| return 0; |
| } |
| |
| break; |
| |
| case AF_INET6: |
| r = sd_netlink_message_read_in6_addr(message, IFA_ADDRESS, &address->in_addr.in6); |
| if (r < 0) { |
| log_link_warning_errno(link, r, "rtnl: received address without valid address, ignoring: %m"); |
| return 0; |
| } |
| |
| break; |
| |
| default: |
| assert_not_reached("invalid address family"); |
| } |
| |
| if (!inet_ntop(address->family, &address->in_addr, buf, INET6_ADDRSTRLEN)) { |
| log_link_warning(link, "Could not print address"); |
| return 0; |
| } |
| |
| r = sd_netlink_message_read_cache_info(message, IFA_CACHEINFO, &address->cinfo); |
| if (r >= 0) { |
| if (address->cinfo.ifa_valid == CACHE_INFO_INFINITY_LIFE_TIME) |
| valid_str = "ever"; |
| else |
| valid_str = format_timespan(valid_buf, FORMAT_TIMESPAN_MAX, |
| address->cinfo.ifa_valid * USEC_PER_SEC, |
| USEC_PER_SEC); |
| } |
| |
| existing = link_get_equal_address(link, address); |
| |
| switch (type) { |
| case RTM_NEWADDR: |
| if (existing) { |
| log_link_debug(link, "Updating address: %s/%u (valid for %s)", buf, address->prefixlen, valid_str); |
| |
| |
| existing->scope = address->scope; |
| existing->flags = address->flags; |
| existing->cinfo = address->cinfo; |
| |
| } else { |
| log_link_debug(link, "Adding address: %s/%u (valid for %s)", buf, address->prefixlen, valid_str); |
| |
| LIST_PREPEND(addresses, link->addresses, address); |
| address_establish(address, link); |
| |
| address = NULL; |
| |
| link_save(link); |
| } |
| |
| break; |
| |
| case RTM_DELADDR: |
| |
| if (existing) { |
| log_link_debug(link, "Removing address: %s/%u (valid for %s)", buf, address->prefixlen, valid_str); |
| address_release(existing, link); |
| LIST_REMOVE(addresses, link->addresses, existing); |
| address_free(existing); |
| } else |
| log_link_warning(link, "Removing non-existent address: %s/%u (valid for %s)", buf, address->prefixlen, valid_str); |
| |
| break; |
| default: |
| assert_not_reached("Received invalid RTNL message type"); |
| } |
| |
| return 1; |
| } |
| |
| 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); |
| |
| if (detect_container(NULL) <= 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) |
| return log_link_warning_errno(link, errno, "Could not find udev device: %m"); |
| |
| 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) |
| return r; |
| } 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) |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| static int link_carrier_gained(Link *link) { |
| int r; |
| |
| assert(link); |
| |
| if (link->network) { |
| r = link_acquire_conf(link); |
| if (r < 0) { |
| link_enter_failed(link); |
| 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); |
| |
| free(link->ifname); |
| link->ifname = strdup(ifname); |
| if (!link->ifname) |
| return -ENOMEM; |
| |
| 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) { |
| 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"); |
| } |
| |
| if (link->dhcp6_client) { |
| 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"); |
| } |
| } |
| } |
| |
| had_carrier = link_has_carrier(link); |
| |
| r = link_update_flags(link, m); |
| 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 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; |
| |
| /* if we have carrier, check what addresses we have */ |
| LIST_FOREACH(addresses, address, link->addresses) { |
| if (address->flags & (IFA_F_TENTATIVE | IFA_F_DEPRECATED)) |
| 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); |
| } |
| } |
| |
| int link_save(Link *link) { |
| _cleanup_free_ char *temp_path = NULL; |
| _cleanup_fclose_ FILE *f = NULL; |
| const char *admin_state, *oper_state; |
| int r; |
| |
| assert(link); |
| assert(link->state_file); |
| assert(link->lease_file); |
| assert(link->manager); |
| |
| link_update_operstate(link); |
| |
| r = manager_save(link->manager); |
| if (r < 0) |
| return r; |
| |
| if (link->state == LINK_STATE_LINGER) { |
| unlink(link->state_file); |
| return 0; |
| } |
| |
| 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) { |
| char **address, **domain; |
| bool space; |
| |
| fprintf(f, "NETWORK_FILE=%s\n", link->network->filename); |
| |
| fputs("DNS=", f); |
| space = false; |
| STRV_FOREACH(address, link->network->dns) { |
| if (space) |
| fputc(' ', f); |
| fputs(*address, f); |
| space = true; |
| } |
| |
| if (link->network->dhcp_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); |
| } |
| } |
| |
| fputs("\n", f); |
| |
| fprintf(f, "NTP="); |
| space = false; |
| STRV_FOREACH(address, link->network->ntp) { |
| if (space) |
| fputc(' ', f); |
| fputs(*address, f); |
| space = true; |
| } |
| |
| if (link->network->dhcp_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); |
| } |
| } |
| |
| fputs("\n", f); |
| |
| fprintf(f, "DOMAINS="); |
| space = false; |
| STRV_FOREACH(domain, link->network->domains) { |
| if (space) |
| fputc(' ', f); |
| fputs(*domain, f); |
| space = true; |
| } |
| |
| if (link->network->dhcp_domains && |
| link->dhcp_lease) { |
| const char *domainname; |
| |
| r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname); |
| if (r >= 0) { |
| if (space) |
| fputc(' ', f); |
| fputs(domainname, f); |
| } |
| } |
| |
| fputs("\n", f); |
| |
| fprintf(f, "WILDCARD_DOMAIN=%s\n", |
| yes_no(link->network->wildcard_domain)); |
| |
| fprintf(f, "LLMNR=%s\n", |
| llmnr_support_to_string(link->network->llmnr)); |
| } |
| |
| if (!hashmap_isempty(link->bound_to_links)) { |
| Link *carrier; |
| Iterator i; |
| bool space = false; |
| |
| fputs("CARRIER_BOUND_TO=", f); |
| HASHMAP_FOREACH(carrier, link->bound_to_links, i) { |
| if (space) |
| fputc(' ', f); |
| fputs(carrier->ifname, f); |
| space = true; |
| } |
| |
| fputs("\n", f); |
| } |
| |
| if (!hashmap_isempty(link->bound_by_links)) { |
| Link *carrier; |
| Iterator i; |
| bool space = false; |
| |
| fputs("CARRIER_BOUND_BY=", f); |
| HASHMAP_FOREACH(carrier, link->bound_by_links, i) { |
| if (space) |
| fputc(' ', f); |
| fputs(carrier->ifname, f); |
| space = true; |
| } |
| |
| fputs("\n", f); |
| } |
| |
| if (link->dhcp_lease) { |
| assert(link->network); |
| |
| r = sd_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->lldp) { |
| assert(link->network); |
| |
| r = sd_lldp_save(link->lldp, link->lldp_file); |
| if (r < 0) |
| goto fail; |
| |
| fprintf(f, |
| "LLDP_FILE=%s\n", |
| link->lldp_file); |
| } else |
| unlink(link->lldp_file); |
| |
| 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: |
| log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file); |
| (void) unlink(link->state_file); |
| |
| if (temp_path) |
| (void) unlink(temp_path); |
| |
| return r; |
| } |
| |
| 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); |