1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2013 Tom Gundersen <teg@jklm.no>
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include <sys/socket.h>
25 #include "conf-parser.h"
26 #include "path-util.h"
28 #include "network-internal.h"
29 #include "libudev-private.h"
30 #include "udev-util.h"
31 #include "rtnl-util.h"
37 const char* const network_dirs[] = {
38 "/etc/systemd/network",
39 "/run/systemd/network",
40 "/usr/lib/systemd/network",
42 "/lib/systemd/network",
46 static int dispatch_sigterm(sd_event_source *es, const struct signalfd_siginfo *si, void *userdata) {
47 Manager *m = userdata;
51 log_received_signal(LOG_INFO, si);
53 sd_event_exit(m->event, 0);
57 static int setup_signals(Manager *m) {
63 assert_se(sigemptyset(&mask) == 0);
64 sigset_add_many(&mask, SIGINT, SIGTERM, -1);
65 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
67 r = sd_event_add_signal(m->event, &m->sigterm_event_source, SIGTERM, dispatch_sigterm, m);
71 r = sd_event_add_signal(m->event, &m->sigint_event_source, SIGINT, dispatch_sigterm, m);
78 int manager_new(Manager **ret) {
79 _cleanup_manager_free_ Manager *m = NULL;
86 m->state_file = strdup("/run/systemd/netif/state");
90 r = sd_event_default(&m->event);
94 sd_event_set_watchdog(m->event, true);
96 r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR,
101 r = sd_bus_default_system(&m->bus);
102 if (r < 0 && r != -ENOENT) /* TODO: drop when we can rely on kdbus */
105 r = setup_signals(m);
109 /* udev does not initialize devices inside containers,
110 * so we rely on them being already initialized before
111 * entering the container */
112 if (detect_container(NULL) <= 0) {
113 m->udev = udev_new();
117 m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
118 if (!m->udev_monitor)
122 m->links = hashmap_new(uint64_hash_func, uint64_compare_func);
126 m->netdevs = hashmap_new(string_hash_func, string_compare_func);
130 LIST_HEAD_INIT(m->networks);
138 void manager_free(Manager *m) {
148 udev_monitor_unref(m->udev_monitor);
150 sd_bus_unref(m->bus);
151 sd_event_source_unref(m->udev_event_source);
152 sd_event_source_unref(m->sigterm_event_source);
153 sd_event_source_unref(m->sigint_event_source);
154 sd_event_unref(m->event);
156 while ((link = hashmap_first(m->links)))
158 hashmap_free(m->links);
160 while ((network = m->networks))
161 network_free(network);
163 while ((netdev = hashmap_first(m->netdevs)))
164 netdev_unref(netdev);
165 hashmap_free(m->netdevs);
167 sd_rtnl_unref(m->rtnl);
172 int manager_load_config(Manager *m) {
175 /* update timestamp */
176 paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true);
189 bool manager_should_reload(Manager *m) {
190 return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false);
193 static int manager_udev_process_link(Manager *m, struct udev_device *device) {
200 if (!streq_ptr(udev_device_get_action(device), "add"))
203 ifindex = udev_device_get_ifindex(device);
205 log_debug("ignoring udev ADD event for device with invalid ifindex");
209 r = link_get(m, ifindex, &link);
215 r = link_initialized(link, device);
222 static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) {
223 Manager *m = userdata;
225 NetDev *netdev = NULL;
234 r = sd_rtnl_message_get_type(message, &type);
236 log_warning("rtnl: could not get message type");
240 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
241 if (r < 0 || ifindex <= 0) {
242 log_warning("rtnl: received link message without valid ifindex");
245 link_get(m, ifindex, &link);
247 r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &name);
248 if (r < 0 || !name) {
249 log_warning("rtnl: received link message without valid ifname");
252 netdev_get(m, name, &netdev);
257 /* link is new, so add it */
258 r = link_add(m, message, &link);
260 log_debug("could not add new link");
266 /* netdev exists, so make sure the ifindex matches */
267 r = netdev_set_ifindex(netdev, message);
269 log_debug("could not set ifindex on netdev");
274 r = link_update(link, message);
287 assert_not_reached("Received invalid RTNL message type.");
293 int manager_rtnl_enumerate_links(Manager *m) {
294 _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
295 sd_rtnl_message *link;
301 r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
305 r = sd_rtnl_message_request_dump(req, true);
309 r = sd_rtnl_call(m->rtnl, req, 0, &reply);
313 for (link = reply; link; link = sd_rtnl_message_next(link)) {
316 k = sd_rtnl_message_get_type(link, &type);
320 if (type != RTM_NEWLINK)
323 k = manager_rtnl_process_link(m->rtnl, link, m);
331 static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
332 Manager *m = userdata;
333 struct udev_monitor *monitor = m->udev_monitor;
334 _cleanup_udev_device_unref_ struct udev_device *device = NULL;
336 device = udev_monitor_receive_device(monitor);
340 manager_udev_process_link(m, device);
344 int manager_udev_listen(Manager *m) {
347 if (detect_container(NULL) > 0)
350 assert(m->udev_monitor);
352 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL);
354 log_error("Could not add udev monitor filter: %s", strerror(-r));
358 r = udev_monitor_enable_receiving(m->udev_monitor);
360 log_error("Could not enable udev monitor");
364 r = sd_event_add_io(m->event,
365 &m->udev_event_source,
366 udev_monitor_get_fd(m->udev_monitor),
367 EPOLLIN, manager_dispatch_link_udev,
375 int manager_rtnl_listen(Manager *m) {
378 r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
382 r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
386 r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, &manager_rtnl_process_link, m);
390 r = sd_rtnl_add_match(m->rtnl, RTM_NEWADDR, &link_rtnl_process_address, m);
394 r = sd_rtnl_add_match(m->rtnl, RTM_DELADDR, &link_rtnl_process_address, m);
401 int manager_bus_listen(Manager *m) {
406 if (!m->bus) /* TODO: drop when we can rely on kdbus */
409 r = sd_bus_attach_event(m->bus, m->event, 0);
416 int manager_save(Manager *m) {
419 _cleanup_free_ char *temp_path = NULL;
420 _cleanup_fclose_ FILE *f = NULL;
421 LinkOperationalState operstate = LINK_OPERSTATE_UNKNOWN;
422 const char *operstate_str;
426 assert(m->state_file);
428 HASHMAP_FOREACH(link, m->links, i) {
429 if (link->flags & IFF_LOOPBACK)
432 if (link->operstate > operstate)
433 operstate = link->operstate;
436 operstate_str = link_operstate_to_string(operstate);
437 assert(operstate_str);
439 r = fopen_temporary(m->state_file, &f, &temp_path);
443 fchmod(fileno(f), 0644);
446 "# This is private data. Do not parse.\n"
447 "OPER_STATE=%s\n", operstate_str);
451 if (ferror(f) || rename(temp_path, m->state_file) < 0) {
453 unlink(m->state_file);
459 log_error("Failed to save network state to %s: %s", m->state_file, strerror(-r));