/*-*- 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 "path-util.h" #include "networkd.h" #include "libudev-private.h" #include "udev-util.h" int manager_new(Manager **ret) { _cleanup_manager_free_ Manager *m = NULL; int r; m = new0(Manager, 1); if (!m) return -ENOMEM; r = sd_event_default(&m->event); if (r < 0) return r; sd_event_set_watchdog(m->event, true); r = sd_rtnl_open(RTMGRP_LINK | RTMGRP_IPV4_IFADDR, &m->rtnl); if (r < 0) return r; 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; m->links = hashmap_new(uint64_hash_func, uint64_compare_func); if (!m->links) return -ENOMEM; m->bridges = hashmap_new(string_hash_func, string_compare_func); if (!m->bridges) return -ENOMEM; LIST_HEAD_INIT(m->networks); m->network_dirs = strv_new("/etc/systemd/network/", "/run/systemd/network/", "/usr/lib/systemd/network", #ifdef HAVE_SPLIT_USER "/lib/systemd/network", #endif NULL); if (!m->network_dirs) return -ENOMEM; if (!path_strv_canonicalize_uniq(m->network_dirs)) return -ENOMEM; *ret = m; m = NULL; return 0; } void manager_free(Manager *m) { Network *network; Bridge *bridge; Link *link; udev_monitor_unref(m->udev_monitor); udev_unref(m->udev); sd_event_source_unref(m->udev_event_source); sd_event_unref(m->event); while ((network = m->networks)) network_free(network); while ((link = hashmap_first(m->links))) link_free(link); hashmap_free(m->links); while ((bridge = hashmap_first(m->bridges))) bridge_free(bridge); hashmap_free(m->bridges); strv_free(m->network_dirs); sd_rtnl_unref(m->rtnl); free(m); } int manager_load_config(Manager *m) { int r; /* update timestamp */ paths_check_timestamp(m->network_dirs, &m->network_dirs_ts_usec, true); r = bridge_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(m->network_dirs, &m->network_dirs_ts_usec, false); } static int manager_process_link(Manager *m, struct udev_device *device) { Link *link; int r; if (streq_ptr(udev_device_get_action(device), "remove")) { uint64_t ifindex; log_debug("Link removed: %s", udev_device_get_sysname(device)); ifindex = udev_device_get_ifindex(device); link = hashmap_get(m->links, &ifindex); if (!link) return 0; link_free(link); } else { log_debug("New link: %s", udev_device_get_sysname(device)); r = link_add(m, device); if (r < 0) { log_error("Could not handle link %s: %s", udev_device_get_sysname(device), strerror(-r)); } } return 0; } int manager_udev_enumerate_links(Manager *m) { struct udev_list_entry *item = NULL, *first = NULL; struct udev_enumerate *e; int r; assert(m); e = udev_enumerate_new(m->udev); if (!e) { r = -ENOMEM; goto finish; } r = udev_enumerate_add_match_subsystem(e, "net"); if (r < 0) goto finish; r = udev_enumerate_scan_devices(e); if (r < 0) goto finish; first = udev_enumerate_get_list_entry(e); udev_list_entry_foreach(item, first) { struct udev_device *d; int k; d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item)); if (!d) { r = -ENOMEM; goto finish; } k = manager_process_link(m, d); udev_device_unref(d); if (k < 0) r = k; } finish: if (e) udev_enumerate_unref(e); return r; } 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_process_link(m, device); return 0; } int manager_udev_listen(Manager *m) { int r; r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL); if (r < 0) { log_error("Could not add udev monitor filter: %s", strerror(-r)); return r; } 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, udev_monitor_get_fd(m->udev_monitor), EPOLLIN, manager_dispatch_link_udev, m, &m->udev_event_source); if (r < 0) return r; return 0; } static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) { Manager *m = userdata; Link *link; unsigned flags; int r, ifindex; r = sd_rtnl_message_link_get_ifindex(message, &ifindex); if (r < 0) return 0; link = hashmap_get(m->links, &ifindex); if (!link) return 0; r = sd_rtnl_message_link_get_flags(message, &flags); if (r < 0) return 0; r = link_update_flags(link, flags); if (r < 0) return 0; return 1; } int manager_rtnl_listen(Manager *m) { int r; r = sd_rtnl_attach_event(m->rtnl, m->event, 0); if (r < 0) return r; r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m); if (r < 0) return r; return 0; }