| /* SPDX-License-Identifier: LGPL-2.1+ */ |
| |
| #include <netinet/ether.h> |
| #include <linux/if.h> |
| #include <fnmatch.h> |
| |
| #include "alloc-util.h" |
| #include "link.h" |
| #include "manager.h" |
| #include "netlink-util.h" |
| #include "network-internal.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->interfaces && !hashmap_contains(m->interfaces, link->ifname)) |
| return true; |
| |
| if (!link->required_for_online) |
| return true; |
| |
| /* ignore interfaces we explicitly are asked to ignore */ |
| return strv_fnmatch(m->ignore, link->ifname, 0); |
| } |
| |
| static int manager_link_is_online(Manager *m, Link *l, LinkOperationalState s) { |
| /* This returns the following: |
| * -EAGAIN: not processed by udev or networkd |
| * 0: operstate is not enough |
| * 1: online */ |
| |
| if (!l->state) |
| return log_link_debug_errno(l, SYNTHETIC_ERRNO(EAGAIN), |
| "link has not yet been processed by udev"); |
| |
| if (STR_IN_SET(l->state, "configuring", "pending")) |
| return log_link_debug_errno(l, SYNTHETIC_ERRNO(EAGAIN), |
| "link is being processed by networkd"); |
| |
| if (s < 0) |
| s = m->required_operstate >= 0 ? m->required_operstate : l->required_operstate; |
| |
| if (l->operational_state < s) { |
| log_link_debug(l, "Operational state '%s' is below '%s'", |
| link_operstate_to_string(l->operational_state), |
| link_operstate_to_string(s)); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| bool manager_configured(Manager *m) { |
| bool one_ready = false; |
| Iterator i; |
| const char *ifname; |
| void *p; |
| Link *l; |
| int r; |
| |
| if (!hashmap_isempty(m->interfaces)) { |
| /* wait for all the links given on the command line to appear */ |
| HASHMAP_FOREACH_KEY(p, ifname, m->interfaces, i) { |
| LinkOperationalState s = PTR_TO_INT(p); |
| |
| l = hashmap_get(m->links_by_name, ifname); |
| if (!l) { |
| log_debug("still waiting for %s", ifname); |
| if (!m->any) |
| return false; |
| continue; |
| } |
| |
| if (manager_link_is_online(m, l, s) <= 0) { |
| if (!m->any) |
| return false; |
| continue; |
| } |
| |
| one_ready = true; |
| } |
| |
| /* all interfaces given by the command line are online, or |
| * one of the specified interfaces is online. */ |
| return one_ready; |
| } |
| |
| /* 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_link_debug(l, "link is ignored"); |
| continue; |
| } |
| |
| r = manager_link_is_online(m, l, _LINK_OPERSTATE_INVALID); |
| if (r < 0 && !m->any) |
| return false; |
| if (r > 0) |
| /* 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_netlink *rtnl, sd_netlink_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_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, 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_warning_errno(l, 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; |
| sd_netlink_message *i; |
| 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_request_dump(req, true); |
| if (r < 0) |
| return r; |
| |
| r = sd_netlink_call(m->rtnl, req, 0, &reply); |
| if (r < 0) |
| return r; |
| |
| for (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 = 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_link_warning_errno(l, r, "Failed to update monitor information: %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 *interfaces, char **ignore, |
| LinkOperationalState required_operstate, |
| 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) { |
| .interfaces = interfaces, |
| .ignore = ignore, |
| .required_operstate = required_operstate, |
| .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) { |
| 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 = TAKE_PTR(m); |
| |
| return 0; |
| } |
| |
| void manager_free(Manager *m) { |
| if (!m) |
| return; |
| |
| hashmap_free_with_destructor(m->links, 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); |
| free(m); |
| |
| return; |
| } |