/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include "alloc-util.h" #include "link.h" #include "manager.h" #include "netlink-util.h" #include "strv.h" #include "time-util.h" #include "util.h" static bool manager_ignore_link(Manager *m, Link *link) { assert(m); assert(link); /* always ignore the loopback interface */ if (link->flags & IFF_LOOPBACK) return true; /* if interfaces are given on the command line, ignore all others */ if (m->command_line_interfaces_by_name && !hashmap_contains(m->command_line_interfaces_by_name, link->ifname)) return true; if (!link->required_for_online) return true; /* ignore interfaces we explicitly are asked to ignore */ return strv_fnmatch(m->ignored_interfaces, link->ifname); } static int manager_link_is_online(Manager *m, Link *l, LinkOperationalStateRange s) { AddressFamily required_family; bool needs_ipv4; bool needs_ipv6; assert(m); assert(l); /* This returns the following: * -EAGAIN : not processed by udev * -EBUSY : being processed by networkd * -EADDRNOTAVAIL: requested conditions (operstate and/or addresses) are not satisfied * false : unmanaged * true : online */ if (!l->state || streq(l->state, "pending")) /* If no state string exists, networkd (and possibly also udevd) has not detected the * interface yet, that mean we cannot determine whether the interface is managed or * not. Hence, return negative value. * If the link is in pending state, then udevd has not processed the link, and networkd * has not tried to find .network file for the link. Hence, return negative value. */ return log_link_debug_errno(l, SYNTHETIC_ERRNO(EAGAIN), "link has not yet been processed by udev: setup state is %s.", strna(l->state)); if (streq(l->state, "unmanaged")) { /* If the link is in unmanaged state, then ignore the interface unless the interface is * specified in '--interface/-i' option. */ if (!hashmap_contains(m->command_line_interfaces_by_name, l->ifname)) { log_link_debug(l, "link is not managed by networkd."); return false; } } else if (!streq(l->state, "configured")) /* If the link is in non-configured state, return negative value here. */ return log_link_debug_errno(l, SYNTHETIC_ERRNO(EBUSY), "link is being processed by networkd: setup state is %s.", l->state); if (s.min < 0) s.min = m->required_operstate.min >= 0 ? m->required_operstate.min : l->required_operstate.min; if (s.max < 0) s.max = m->required_operstate.max >= 0 ? m->required_operstate.max : l->required_operstate.max; if (l->operational_state < s.min || l->operational_state > s.max) return log_link_debug_errno(l, SYNTHETIC_ERRNO(EADDRNOTAVAIL), "Operational state '%s' is not in range ['%s':'%s']", link_operstate_to_string(l->operational_state), link_operstate_to_string(s.min), link_operstate_to_string(s.max)); required_family = m->required_family > 0 ? m->required_family : l->required_family; needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4; needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6; if (s.min < LINK_OPERSTATE_ROUTABLE) { if (needs_ipv4 && l->ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED) return log_link_debug_errno(l, SYNTHETIC_ERRNO(EADDRNOTAVAIL), "No routable or link-local IPv4 address is configured."); if (needs_ipv6 && l->ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED) return log_link_debug_errno(l, SYNTHETIC_ERRNO(EADDRNOTAVAIL), "No routable or link-local IPv6 address is configured."); } else { if (needs_ipv4 && l->ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE) return log_link_debug_errno(l, SYNTHETIC_ERRNO(EADDRNOTAVAIL), "No routable IPv4 address is configured."); if (needs_ipv6 && l->ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE) return log_link_debug_errno(l, SYNTHETIC_ERRNO(EADDRNOTAVAIL), "No routable IPv6 address is configured."); } log_link_debug(l, "link is configured by networkd and online."); return true; } bool manager_configured(Manager *m) { Link *l; int r; if (!hashmap_isempty(m->command_line_interfaces_by_name)) { LinkOperationalStateRange *range; const char *ifname; /* wait for all the links given on the command line to appear */ HASHMAP_FOREACH_KEY(range, ifname, m->command_line_interfaces_by_name) { l = hashmap_get(m->links_by_name, ifname); if (!l) { if (range->min == LINK_OPERSTATE_MISSING) { if (m->any) return true; } else { log_debug("still waiting for %s", ifname); if (!m->any) return false; } continue; } r = manager_link_is_online(m, l, *range); if (r <= 0 && !m->any) return false; if (r > 0 && m->any) return true; } /* With '--any' : no interface is ready → return false * Without '--any': all interfaces are ready → return true */ return !m->any; } /* wait for all links networkd manages */ bool has_online = false; HASHMAP_FOREACH(l, m->links_by_index) { if (manager_ignore_link(m, l)) { log_link_debug(l, "link is ignored"); continue; } r = manager_link_is_online(m, l, (LinkOperationalStateRange) { _LINK_OPERSTATE_INVALID, _LINK_OPERSTATE_INVALID }); if (r < 0 && !m->any) /* Unlike the above loop, unmanaged interfaces are ignored here. */ return false; if (r > 0) { if (m->any) return true; has_online = true; } } /* With '--any' : no interface is ready → return false * Without '--any': all interfaces are ready or unmanaged * * In this stage, drivers for interfaces may not be loaded yet, and there may be only lo. * To avoid that wait-online exits earlier than that drivers are loaded, let's request at least one * managed online interface exists. See issue #27822. */ return !m->any && has_online; } static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { Manager *m = ASSERT_PTR(userdata); uint16_t type; Link *l; const char *ifname; int ifindex, r; assert(rtnl); assert(mm); r = sd_netlink_message_get_type(mm, &type); if (r < 0) { log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m"); return 0; } r = sd_rtnl_message_link_get_ifindex(mm, &ifindex); if (r < 0) { log_warning_errno(r, "rtnl: Could not get ifindex from link, ignoring: %m"); return 0; } else if (ifindex <= 0) { log_warning("rtnl: received link message with invalid ifindex %d, ignoring", ifindex); return 0; } r = sd_netlink_message_read_string(mm, IFLA_IFNAME, &ifname); if (r < 0) { log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m"); return 0; } l = hashmap_get(m->links_by_index, 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) return log_error_errno(r, "Failed to create link object: %m"); } r = link_update_rtnl(l, mm); if (r < 0) log_link_warning_errno(l, r, "Failed to process RTNL link message, ignoring: %m"); r = link_update_monitor(l); if (r < 0) log_link_full_errno(l, IN_SET(r, -ENODATA, -ENOENT) ? LOG_DEBUG : LOG_WARNING, r, "Failed to update link state, ignoring: %m"); break; case RTM_DELLINK: if (l) { log_link_debug(l, "Removing link"); link_free(l); } break; } return 0; } static int on_rtnl_event(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { Manager *m = userdata; int r; r = manager_process_link(rtnl, mm, m); if (r < 0) return r; if (manager_configured(m)) sd_event_exit(m->event, 0); return 1; } static int manager_rtnl_listen(Manager *m) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; int r; assert(m); /* First, subscribe to interfaces coming and going */ r = sd_netlink_open(&m->rtnl); 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, NULL, RTM_NEWLINK, on_rtnl_event, NULL, m, "wait-online-on-NEWLINK"); if (r < 0) return r; r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, on_rtnl_event, NULL, m, "wait-online-on-DELLINK"); 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_netlink_message_set_request_dump(req, true); if (r < 0) return r; r = sd_netlink_call(m->rtnl, req, 0, &reply); if (r < 0) return r; for (sd_netlink_message *i = reply; i; i = sd_netlink_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 = ASSERT_PTR(userdata); Link *l; int r; sd_network_monitor_flush(m->network_monitor); HASHMAP_FOREACH(l, m->links_by_index) { r = link_update_monitor(l); if (r < 0) log_link_full_errno(l, IN_SET(r, -ENODATA, -ENOENT) ? LOG_DEBUG : LOG_WARNING, r, "Failed to update link state, ignoring: %m"); } if (manager_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, Hashmap *command_line_interfaces_by_name, char **ignored_interfaces, LinkOperationalStateRange required_operstate, AddressFamily required_family, bool any, usec_t timeout) { _cleanup_(manager_freep) Manager *m = NULL; int r; assert(ret); m = new(Manager, 1); if (!m) return -ENOMEM; *m = (Manager) { .command_line_interfaces_by_name = command_line_interfaces_by_name, .ignored_interfaces = ignored_interfaces, .required_operstate = required_operstate, .required_family = required_family, .any = any, }; r = sd_event_default(&m->event); if (r < 0) return r; (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); if (timeout > 0) { r = sd_event_add_time_relative(m->event, NULL, CLOCK_BOOTTIME, timeout, 0, NULL, INT_TO_PTR(-ETIMEDOUT)); if (r < 0 && r != -EOVERFLOW) 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 = TAKE_PTR(m); return 0; } Manager* manager_free(Manager *m) { if (!m) return NULL; hashmap_free_with_destructor(m->links_by_index, link_free); 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_netlink_unref(m->rtnl); sd_event_unref(m->event); return mfree(m); }