networkd-wait-online-manager.c revision 5d8689d749ffc50ade3d5c8598c1d3d11f5240f2
/*-*- 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-util.h"
#include "network-internal.h"
#include "networkd-wait-online-link.h"
#include "networkd-wait-online.h"
#include "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) {
_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);
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;
}