323 lines
8.5 KiB
C
323 lines
8.5 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Tom Gundersen <teg@jklm.no>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <netinet/ether.h>
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#include <linux/if.h>
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#include <fnmatch.h>
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#include "rtnl-util.h"
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#include "network-util.h"
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#include "network-internal.h"
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#include "networkd-wait-online-link.h"
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#include "networkd-wait-online.h"
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#include "util.h"
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bool manager_ignore_link(Manager *m, Link *link) {
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char **ignore;
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assert(m);
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assert(link);
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if (link->flags & IFF_LOOPBACK)
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return true;
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STRV_FOREACH(ignore, m->ignore)
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if (fnmatch(*ignore, link->ifname, 0) == 0)
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return true;
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return false;
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}
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bool manager_all_configured(Manager *m) {
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Iterator i;
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Link *l;
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char **ifname;
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bool one_ready = false;
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/* wait for all the links given on the command line to appear */
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STRV_FOREACH(ifname, m->interfaces) {
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l = hashmap_get(m->links_by_name, *ifname);
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if (!l) {
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log_debug("still waiting for %s", *ifname);
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return false;
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}
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}
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/* wait for all links networkd manages to be in admin state 'configured'
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and at least one link to gain a carrier */
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HASHMAP_FOREACH(l, m->links, i) {
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if (manager_ignore_link(m, l)) {
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log_info("ignoring: %s", l->ifname);
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continue;
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}
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if (!l->state) {
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log_debug("link %s has not yet been processed by udev",
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l->ifname);
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return false;
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}
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if (streq(l->state, "configuring")) {
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log_debug("link %s is being processed by networkd",
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l->ifname);
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return false;
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}
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if (l->operational_state &&
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STR_IN_SET(l->operational_state, "degraded", "routable"))
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/* we wait for at least one link to be ready,
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regardless of who manages it */
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one_ready = true;
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}
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return one_ready;
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}
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static int manager_process_link(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) {
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Manager *m = userdata;
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uint16_t type;
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Link *l;
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const char *ifname;
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int ifindex, r;
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assert(rtnl);
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assert(m);
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assert(mm);
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r = sd_rtnl_message_get_type(mm, &type);
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if (r < 0)
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goto fail;
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r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
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if (r < 0)
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goto fail;
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r = sd_rtnl_message_read_string(mm, IFLA_IFNAME, &ifname);
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if (r < 0)
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goto fail;
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l = hashmap_get(m->links, INT_TO_PTR(ifindex));
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switch (type) {
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case RTM_NEWLINK:
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if (!l) {
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log_debug("Found link %i", ifindex);
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r = link_new(m, &l, ifindex, ifname);
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if (r < 0)
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goto fail;
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r = link_update_monitor(l);
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if (r < 0)
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goto fail;
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}
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r = link_update_rtnl(l, mm);
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if (r < 0)
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goto fail;
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break;
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case RTM_DELLINK:
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if (l) {
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log_debug("Removing link %i", l->ifindex);
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link_free(l);
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}
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break;
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}
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return 0;
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fail:
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log_warning_errno(r, "Failed to process RTNL link message: %m");
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return 0;
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}
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static int on_rtnl_event(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) {
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Manager *m = userdata;
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int r;
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r = manager_process_link(rtnl, mm, m);
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if (r < 0)
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return r;
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if (manager_all_configured(m))
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sd_event_exit(m->event, 0);
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return 1;
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}
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static int manager_rtnl_listen(Manager *m) {
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_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
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sd_rtnl_message *i;
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int r;
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assert(m);
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/* First, subscribe to interfaces coming and going */
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r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR);
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if (r < 0)
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return r;
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r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
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if (r < 0)
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return r;
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r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, on_rtnl_event, m);
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if (r < 0)
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return r;
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r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, on_rtnl_event, m);
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if (r < 0)
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return r;
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/* Then, enumerate all links */
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r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
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if (r < 0)
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return r;
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r = sd_rtnl_message_request_dump(req, true);
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if (r < 0)
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return r;
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r = sd_rtnl_call(m->rtnl, req, 0, &reply);
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if (r < 0)
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return r;
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for (i = reply; i; i = sd_rtnl_message_next(i)) {
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r = manager_process_link(m->rtnl, i, m);
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if (r < 0)
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return r;
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}
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return r;
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}
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static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
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Manager *m = userdata;
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Iterator i;
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Link *l;
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int r;
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assert(m);
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sd_network_monitor_flush(m->network_monitor);
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HASHMAP_FOREACH(l, m->links, i) {
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r = link_update_monitor(l);
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if (r < 0)
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log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex);
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}
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if (manager_all_configured(m))
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sd_event_exit(m->event, 0);
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return 0;
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}
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static int manager_network_monitor_listen(Manager *m) {
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int r, fd, events;
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assert(m);
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r = sd_network_monitor_new(&m->network_monitor, NULL);
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if (r < 0)
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return r;
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fd = sd_network_monitor_get_fd(m->network_monitor);
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if (fd < 0)
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return fd;
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events = sd_network_monitor_get_events(m->network_monitor);
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if (events < 0)
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return events;
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r = sd_event_add_io(m->event, &m->network_monitor_event_source,
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fd, events, &on_network_event, m);
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if (r < 0)
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return r;
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return 0;
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}
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int manager_new(Manager **ret, char **interfaces, char **ignore) {
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_cleanup_(manager_freep) Manager *m = NULL;
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int r;
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assert(ret);
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m = new0(Manager, 1);
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if (!m)
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return -ENOMEM;
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m->interfaces = interfaces;
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m->ignore = ignore;
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r = sd_event_default(&m->event);
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if (r < 0)
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return r;
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sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
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sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
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sd_event_set_watchdog(m->event, true);
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r = manager_network_monitor_listen(m);
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if (r < 0)
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return r;
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r = manager_rtnl_listen(m);
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if (r < 0)
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return r;
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*ret = m;
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m = NULL;
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return 0;
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}
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void manager_free(Manager *m) {
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Link *l;
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if (!m)
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return;
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while ((l = hashmap_first(m->links)))
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link_free(l);
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hashmap_free(m->links);
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hashmap_free(m->links_by_name);
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sd_event_source_unref(m->network_monitor_event_source);
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sd_network_monitor_unref(m->network_monitor);
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sd_event_source_unref(m->rtnl_event_source);
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sd_rtnl_unref(m->rtnl);
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sd_event_unref(m->event);
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free(m);
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return;
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}
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