/*-*- 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 <fnmatch.h> #include "rtnl-util.h" #include "network-internal.h" #include "networkd-wait-online-link.h" #include "networkd-wait-online.h" #include "util.h" #include "time-util.h" bool manager_ignore_link(Manager *m, Link *link) { char **ignore; assert(m); assert(link); if (link->flags & IFF_LOOPBACK) return true; STRV_FOREACH(ignore, m->ignore) if (fnmatch(*ignore, link->ifname, 0) == 0) return true; return false; } bool manager_all_configured(Manager *m) { Iterator i; Link *l; char **ifname; bool one_ready = false; /* wait for all the links given on the command line to appear */ STRV_FOREACH(ifname, m->interfaces) { l = hashmap_get(m->links_by_name, *ifname); if (!l) { log_debug("still waiting for %s", *ifname); return false; } } /* wait for all links networkd manages to be in admin state 'configured' and at least one link to gain a carrier */ HASHMAP_FOREACH(l, m->links, i) { if (manager_ignore_link(m, l)) { log_info("ignoring: %s", l->ifname); continue; } if (!l->state) { log_debug("link %s has not yet been processed by udev", l->ifname); return false; } if (streq(l->state, "configuring")) { log_debug("link %s is being processed by networkd", l->ifname); return false; } if (l->operational_state && STR_IN_SET(l->operational_state, "degraded", "routable")) /* we wait for at least one link to be ready, regardless of who manages it */ one_ready = true; } return one_ready; } static int manager_process_link(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) { Manager *m = userdata; uint16_t type; Link *l; const char *ifname; int ifindex, r; assert(rtnl); assert(m); assert(mm); r = sd_rtnl_message_get_type(mm, &type); if (r < 0) goto fail; r = sd_rtnl_message_link_get_ifindex(mm, &ifindex); if (r < 0) goto fail; r = sd_rtnl_message_read_string(mm, IFLA_IFNAME, &ifname); if (r < 0) goto fail; l = hashmap_get(m->links, INT_TO_PTR(ifindex)); switch (type) { case RTM_NEWLINK: if (!l) { log_debug("Found link %i", ifindex); r = link_new(m, &l, ifindex, ifname); if (r < 0) goto fail; r = link_update_monitor(l); if (r < 0) goto fail; } r = link_update_rtnl(l, mm); if (r < 0) goto fail; break; case RTM_DELLINK: if (l) { log_debug("Removing link %i", l->ifindex); link_free(l); } break; } return 0; fail: log_warning_errno(r, "Failed to process RTNL link message: %m"); return 0; } static int on_rtnl_event(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) { Manager *m = userdata; int r; r = manager_process_link(rtnl, mm, m); if (r < 0) return r; if (manager_all_configured(m)) sd_event_exit(m->event, 0); return 1; } static int manager_rtnl_listen(Manager *m) { _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL; sd_rtnl_message *i; int r; assert(m); /* First, subscribe to interfaces coming and going */ r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR); if (r < 0) return 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, on_rtnl_event, m); if (r < 0) return r; r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, on_rtnl_event, m); if (r < 0) return r; /* Then, enumerate all links */ r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); if (r < 0) return r; r = sd_rtnl_message_request_dump(req, true); if (r < 0) return r; r = sd_rtnl_call(m->rtnl, req, 0, &reply); if (r < 0) return r; for (i = reply; i; i = sd_rtnl_message_next(i)) { r = manager_process_link(m->rtnl, i, m); if (r < 0) return r; } return r; } static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { Manager *m = userdata; Iterator i; Link *l; int r; assert(m); sd_network_monitor_flush(m->network_monitor); HASHMAP_FOREACH(l, m->links, i) { r = link_update_monitor(l); if (r < 0) log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex); } if (manager_all_configured(m)) sd_event_exit(m->event, 0); return 0; } static int manager_network_monitor_listen(Manager *m) { int r, fd, events; assert(m); r = sd_network_monitor_new(&m->network_monitor, NULL); if (r < 0) return r; fd = sd_network_monitor_get_fd(m->network_monitor); if (fd < 0) return fd; events = sd_network_monitor_get_events(m->network_monitor); if (events < 0) return events; r = sd_event_add_io(m->event, &m->network_monitor_event_source, fd, events, &on_network_event, m); if (r < 0) return r; return 0; } int manager_new(Manager **ret, char **interfaces, char **ignore, usec_t timeout) { _cleanup_(manager_freep) Manager *m = NULL; int r; assert(ret); m = new0(Manager, 1); if (!m) return -ENOMEM; m->interfaces = interfaces; m->ignore = ignore; r = sd_event_default(&m->event); if (r < 0) return r; sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); if (timeout > 0) { usec_t usec; usec = now(clock_boottime_or_monotonic()) + timeout; r = sd_event_add_time(m->event, NULL, clock_boottime_or_monotonic(), usec, 0, NULL, INT_TO_PTR(-ETIMEDOUT)); if (r < 0) return r; } sd_event_set_watchdog(m->event, true); r = manager_network_monitor_listen(m); if (r < 0) return r; r = manager_rtnl_listen(m); if (r < 0) return r; *ret = m; m = NULL; return 0; } void manager_free(Manager *m) { Link *l; if (!m) return; while ((l = hashmap_first(m->links))) link_free(l); hashmap_free(m->links); hashmap_free(m->links_by_name); sd_event_source_unref(m->network_monitor_event_source); sd_network_monitor_unref(m->network_monitor); sd_event_source_unref(m->rtnl_event_source); sd_rtnl_unref(m->rtnl); sd_event_unref(m->event); free(m); return; }