/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2013 Tom Gundersen 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 . ***/ #include #include #include "sd-netlink.h" #include "sd-daemon.h" #include "conf-parser.h" #include "path-util.h" #include "libudev-private.h" #include "udev-util.h" #include "netlink-util.h" #include "bus-util.h" #include "def.h" #include "virt.h" #include "set.h" #include "local-addresses.h" #include "networkd.h" /* use 8 MB for receive socket kernel queue. */ #define RCVBUF_SIZE (8*1024*1024) const char* const network_dirs[] = { "/etc/systemd/network", "/run/systemd/network", "/usr/lib/systemd/network", #ifdef HAVE_SPLIT_USR "/lib/systemd/network", #endif NULL}; static int setup_default_address_pool(Manager *m) { AddressPool *p; int r; assert(m); /* Add in the well-known private address ranges. */ r = address_pool_new_from_string(m, &p, AF_INET6, "fc00::", 7); if (r < 0) return r; r = address_pool_new_from_string(m, &p, AF_INET, "192.168.0.0", 16); if (r < 0) return r; r = address_pool_new_from_string(m, &p, AF_INET, "172.16.0.0", 12); if (r < 0) return r; r = address_pool_new_from_string(m, &p, AF_INET, "10.0.0.0", 8); if (r < 0) return r; return 0; } static int on_bus_retry(sd_event_source *s, usec_t usec, void *userdata) { Manager *m = userdata; assert(s); assert(m); m->bus_retry_event_source = sd_event_source_unref(m->bus_retry_event_source); manager_connect_bus(m); return 0; } static int manager_reset_all(Manager *m) { Link *link; Iterator i; int r; assert(m); HASHMAP_FOREACH(link, m->links, i) { r = link_carrier_reset(link); if (r < 0) log_link_warning_errno(link, r, "Could not reset carrier: %m"); } return 0; } static int match_prepare_for_sleep(sd_bus_message *message, void *userdata, sd_bus_error *ret_error) { Manager *m = userdata; int b, r; assert(message); r = sd_bus_message_read(message, "b", &b); if (r < 0) { log_debug_errno(r, "Failed to parse PrepareForSleep signal: %m"); return 0; } if (b) return 0; log_debug("Coming back from suspend, resetting all connections..."); manager_reset_all(m); return 0; } int manager_connect_bus(Manager *m) { int r; assert(m); r = sd_bus_default_system(&m->bus); if (r == -ENOENT) { /* We failed to connect? Yuck, we must be in early * boot. Let's try in 5s again. As soon as we have * kdbus we can stop doing this... */ log_debug_errno(r, "Failed to connect to bus, trying again in 5s: %m"); r = sd_event_add_time(m->event, &m->bus_retry_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + 5*USEC_PER_SEC, 0, on_bus_retry, m); if (r < 0) return log_error_errno(r, "Failed to install bus reconnect time event: %m"); return 0; } if (r < 0) return r; r = sd_bus_add_match(m->bus, &m->prepare_for_sleep_slot, "type='signal'," "sender='org.freedesktop.login1'," "interface='org.freedesktop.login1.Manager'," "member='PrepareForSleep'," "path='/org/freedesktop/login1'", match_prepare_for_sleep, m); if (r < 0) return log_error_errno(r, "Failed to add match for PrepareForSleep: %m"); r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/network1", "org.freedesktop.network1.Manager", manager_vtable, m); if (r < 0) return log_error_errno(r, "Failed to add manager object vtable: %m"); r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/link", "org.freedesktop.network1.Link", link_vtable, link_object_find, m); if (r < 0) return log_error_errno(r, "Failed to add link object vtable: %m"); r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/link", link_node_enumerator, m); if (r < 0) return log_error_errno(r, "Failed to add link enumerator: %m"); r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/network", "org.freedesktop.network1.Network", network_vtable, network_object_find, m); if (r < 0) return log_error_errno(r, "Failed to add network object vtable: %m"); r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/network", network_node_enumerator, m); if (r < 0) return log_error_errno(r, "Failed to add network enumerator: %m"); r = sd_bus_request_name(m->bus, "org.freedesktop.network1", 0); if (r < 0) return log_error_errno(r, "Failed to register name: %m"); r = sd_bus_attach_event(m->bus, m->event, 0); if (r < 0) return log_error_errno(r, "Failed to attach bus to event loop: %m"); return 0; } static int manager_udev_process_link(Manager *m, struct udev_device *device) { Link *link = NULL; int r, ifindex; assert(m); assert(device); if (!streq_ptr(udev_device_get_action(device), "add")) return 0; ifindex = udev_device_get_ifindex(device); if (ifindex <= 0) { log_debug("Ignoring udev ADD event for device with invalid ifindex"); return 0; } r = link_get(m, ifindex, &link); if (r == -ENODEV) return 0; else if (r < 0) return r; r = link_initialized(link, device); if (r < 0) return r; return 0; } static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) { Manager *m = userdata; struct udev_monitor *monitor = m->udev_monitor; _cleanup_udev_device_unref_ struct udev_device *device = NULL; device = udev_monitor_receive_device(monitor); if (!device) return -ENOMEM; manager_udev_process_link(m, device); return 0; } static int manager_connect_udev(Manager *m) { int r; /* udev does not initialize devices inside containers, * so we rely on them being already initialized before * entering the container */ if (detect_container() > 0) return 0; m->udev = udev_new(); if (!m->udev) return -ENOMEM; m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); if (!m->udev_monitor) return -ENOMEM; r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL); if (r < 0) return log_error_errno(r, "Could not add udev monitor filter: %m"); r = udev_monitor_enable_receiving(m->udev_monitor); if (r < 0) { log_error("Could not enable udev monitor"); return r; } r = sd_event_add_io(m->event, &m->udev_event_source, udev_monitor_get_fd(m->udev_monitor), EPOLLIN, manager_dispatch_link_udev, m); if (r < 0) return r; r = sd_event_source_set_description(m->udev_event_source, "networkd-udev"); if (r < 0) return r; return 0; } static int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) { Manager *m = userdata; Link *link = NULL; NetDev *netdev = NULL; uint16_t type; const char *name; 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: Could not receive link: %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_NEWLINK && type != RTM_DELLINK) { log_warning("rtnl: Received unexpected message type when processing link"); return 0; } r = sd_rtnl_message_link_get_ifindex(message, &ifindex); if (r < 0) { log_warning_errno(r, "rtnl: Could not get ifindex from link: %m"); return 0; } else if (ifindex <= 0) { log_warning("rtnl: received link message with invalid ifindex: %d", ifindex); return 0; } else link_get(m, ifindex, &link); r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name); if (r < 0) { log_warning_errno(r, "rtnl: Received link message without ifname: %m"); return 0; } else netdev_get(m, name, &netdev); switch (type) { case RTM_NEWLINK: if (!link) { /* link is new, so add it */ r = link_add(m, message, &link); if (r < 0) { log_warning_errno(r, "Could not add new link: %m"); return 0; } } if (netdev) { /* netdev exists, so make sure the ifindex matches */ r = netdev_set_ifindex(netdev, message); if (r < 0) { log_warning_errno(r, "Could not set ifindex on netdev: %m"); return 0; } } r = link_update(link, message); if (r < 0) return 0; break; case RTM_DELLINK: link_drop(link); netdev_drop(netdev); break; default: assert_not_reached("Received invalid RTNL message type."); } return 1; } static int systemd_netlink_fd(void) { int n, fd, rtnl_fd = -EINVAL; n = sd_listen_fds(true); if (n <= 0) return -EINVAL; for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++) { if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1) > 0) { if (rtnl_fd >= 0) return -EINVAL; rtnl_fd = fd; } } return rtnl_fd; } static int manager_connect_rtnl(Manager *m) { int fd, r; assert(m); fd = systemd_netlink_fd(); if (fd < 0) r = sd_netlink_open(&m->rtnl); else r = sd_netlink_open_fd(&m->rtnl, fd); if (r < 0) return r; r = sd_netlink_inc_rcvbuf(m->rtnl, RCVBUF_SIZE); if (r < 0) return r; r = sd_netlink_attach_event(m->rtnl, m->event, 0); if (r < 0) return r; r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m); if (r < 0) return r; r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, &manager_rtnl_process_link, m); if (r < 0) return r; r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, &link_rtnl_process_address, m); if (r < 0) return r; r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, &link_rtnl_process_address, m); if (r < 0) return r; return 0; } int manager_new(Manager **ret) { _cleanup_manager_free_ Manager *m = NULL; int r; m = new0(Manager, 1); if (!m) return -ENOMEM; m->state_file = strdup("/run/systemd/netif/state"); if (!m->state_file) return -ENOMEM; r = sd_event_default(&m->event); if (r < 0) return r; sd_event_set_watchdog(m->event, true); sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); r = manager_connect_rtnl(m); if (r < 0) return r; r = manager_connect_udev(m); if (r < 0) return r; m->netdevs = hashmap_new(&string_hash_ops); if (!m->netdevs) return -ENOMEM; LIST_HEAD_INIT(m->networks); r = setup_default_address_pool(m); if (r < 0) return r; *ret = m; m = NULL; return 0; } void manager_free(Manager *m) { Network *network; NetDev *netdev; Link *link; AddressPool *pool; if (!m) return; free(m->state_file); while ((link = hashmap_first(m->links))) link_unref(link); hashmap_free(m->links); while ((network = m->networks)) network_free(network); hashmap_free(m->networks_by_name); while ((netdev = hashmap_first(m->netdevs))) netdev_unref(netdev); hashmap_free(m->netdevs); while ((pool = m->address_pools)) address_pool_free(pool); sd_netlink_unref(m->rtnl); sd_event_unref(m->event); sd_event_source_unref(m->udev_event_source); udev_monitor_unref(m->udev_monitor); udev_unref(m->udev); sd_bus_unref(m->bus); sd_bus_slot_unref(m->prepare_for_sleep_slot); sd_event_source_unref(m->bus_retry_event_source); free(m); } static bool manager_check_idle(void *userdata) { Manager *m = userdata; Link *link; Iterator i; assert(m); HASHMAP_FOREACH(link, m->links, i) { /* we are not woken on udev activity, so let's just wait for the * pending udev event */ if (link->state == LINK_STATE_PENDING) return false; if (!link->network) continue; /* we are not woken on netork activity, so let's stay around */ if (link_lldp_enabled(link) || link_ipv4ll_enabled(link) || link_dhcp4_server_enabled(link) || link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) return false; } return true; } int manager_run(Manager *m) { assert(m); if (m->bus) return bus_event_loop_with_idle( m->event, m->bus, "org.freedesktop.network1", DEFAULT_EXIT_USEC, manager_check_idle, m); else /* failed to connect to the bus, so we lose exit-on-idle logic, this should not happen except if dbus is not around at all */ return sd_event_loop(m->event); } int manager_load_config(Manager *m) { int r; /* update timestamp */ paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true); r = netdev_load(m); if (r < 0) return r; r = network_load(m); if (r < 0) return r; return 0; } bool manager_should_reload(Manager *m) { return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false); } int manager_rtnl_enumerate_links(Manager *m) { _cleanup_netlink_message_unref_ sd_netlink_message *req = NULL, *reply = NULL; sd_netlink_message *link; int r; assert(m); assert(m->rtnl); r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); if (r < 0) return r; r = sd_netlink_message_request_dump(req, true); if (r < 0) return r; r = sd_netlink_call(m->rtnl, req, 0, &reply); if (r < 0) return r; for (link = reply; link; link = sd_netlink_message_next(link)) { int k; m->enumerating = true; k = manager_rtnl_process_link(m->rtnl, link, m); if (k < 0) r = k; m->enumerating = false; } return r; } int manager_rtnl_enumerate_addresses(Manager *m) { _cleanup_netlink_message_unref_ sd_netlink_message *req = NULL, *reply = NULL; sd_netlink_message *addr; int r; assert(m); assert(m->rtnl); r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, 0); if (r < 0) return r; r = sd_netlink_message_request_dump(req, true); if (r < 0) return r; r = sd_netlink_call(m->rtnl, req, 0, &reply); if (r < 0) return r; for (addr = reply; addr; addr = sd_netlink_message_next(addr)) { int k; m->enumerating = true; k = link_rtnl_process_address(m->rtnl, addr, m); if (k < 0) r = k; m->enumerating = false; } return r; } static int set_put_in_addr(Set *s, const struct in_addr *address) { char *p; int r; assert(s); r = in_addr_to_string(AF_INET, (const union in_addr_union*) address, &p); if (r < 0) return r; r = set_consume(s, p); if (r == -EEXIST) return 0; return r; } static int set_put_in_addrv(Set *s, const struct in_addr *addresses, int n) { int r, i, c = 0; assert(s); assert(n <= 0 || addresses); for (i = 0; i < n; i++) { r = set_put_in_addr(s, addresses+i); if (r < 0) return r; c += r; } return c; } static void print_string_set(FILE *f, const char *field, Set *s) { bool space = false; Iterator i; char *p; if (set_isempty(s)) return; fputs(field, f); SET_FOREACH(p, s, i) { if (space) fputc(' ', f); fputs(p, f); space = true; } fputc('\n', f); } int manager_save(Manager *m) { _cleanup_set_free_free_ Set *dns = NULL, *ntp = NULL, *domains = NULL; Link *link; Iterator i; _cleanup_free_ char *temp_path = NULL; _cleanup_fclose_ FILE *f = NULL; LinkOperationalState operstate = LINK_OPERSTATE_OFF; const char *operstate_str; int r; assert(m); assert(m->state_file); /* We add all NTP and DNS server to a set, to filter out duplicates */ dns = set_new(&string_hash_ops); if (!dns) return -ENOMEM; ntp = set_new(&string_hash_ops); if (!ntp) return -ENOMEM; domains = set_new(&string_hash_ops); if (!domains) return -ENOMEM; HASHMAP_FOREACH(link, m->links, i) { if (link->flags & IFF_LOOPBACK) continue; if (link->operstate > operstate) operstate = link->operstate; if (!link->network) continue; /* First add the static configured entries */ r = set_put_strdupv(dns, link->network->dns); if (r < 0) return r; r = set_put_strdupv(ntp, link->network->ntp); if (r < 0) return r; r = set_put_strdupv(domains, link->network->domains); if (r < 0) return r; if (!link->dhcp_lease) continue; /* Secondly, add the entries acquired via DHCP */ if (link->network->dhcp_dns) { const struct in_addr *addresses; r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses); if (r > 0) { r = set_put_in_addrv(dns, addresses, r); if (r < 0) return r; } else if (r < 0 && r != -ENODATA) return r; } if (link->network->dhcp_ntp) { const struct in_addr *addresses; r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses); if (r > 0) { r = set_put_in_addrv(ntp, addresses, r); if (r < 0) return r; } else if (r < 0 && r != -ENODATA) return r; } if (link->network->dhcp_domains) { const char *domainname; r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname); if (r >= 0) { r = set_put_strdup(domains, domainname); if (r < 0) return r; } else if (r != -ENODATA) return r; } } operstate_str = link_operstate_to_string(operstate); assert(operstate_str); r = fopen_temporary(m->state_file, &f, &temp_path); if (r < 0) return r; fchmod(fileno(f), 0644); fprintf(f, "# This is private data. Do not parse.\n" "OPER_STATE=%s\n", operstate_str); print_string_set(f, "DNS=", dns); print_string_set(f, "NTP=", ntp); print_string_set(f, "DOMAINS=", domains); r = fflush_and_check(f); if (r < 0) goto fail; if (rename(temp_path, m->state_file) < 0) { r = -errno; goto fail; } if (m->operational_state != operstate) { m->operational_state = operstate; r = manager_send_changed(m, "OperationalState", NULL); if (r < 0) log_error_errno(r, "Could not emit changed OperationalState: %m"); } return 0; fail: (void) unlink(m->state_file); (void) unlink(temp_path); return log_error_errno(r, "Failed to save network state to %s: %m", m->state_file); } int manager_address_pool_acquire(Manager *m, int family, unsigned prefixlen, union in_addr_union *found) { AddressPool *p; int r; assert(m); assert(prefixlen > 0); assert(found); LIST_FOREACH(address_pools, p, m->address_pools) { if (p->family != family) continue; r = address_pool_acquire(p, prefixlen, found); if (r != 0) return r; } return 0; } Link* manager_find_uplink(Manager *m, Link *exclude) { _cleanup_free_ struct local_address *gateways = NULL; int n, i; assert(m); /* Looks for a suitable "uplink", via black magic: an * interface that is up and where the default route with the * highest priority points to. */ n = local_gateways(m->rtnl, 0, AF_UNSPEC, &gateways); if (n < 0) { log_warning_errno(n, "Failed to determine list of default gateways: %m"); return NULL; } for (i = 0; i < n; i++) { Link *link; link = hashmap_get(m->links, INT_TO_PTR(gateways[i].ifindex)); if (!link) { log_debug("Weird, found a gateway for a link we don't know. Ignoring."); continue; } if (link == exclude) continue; if (link->operstate < LINK_OPERSTATE_ROUTABLE) continue; return link; } return NULL; }