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/*-*- 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 "path-util.h"
#include "networkd.h"
#include "libudev-private.h"
int manager_new(Manager **ret) {
_cleanup_manager_free_ Manager *m = NULL;
int r;
m = new0(Manager, 1);
if (!m)
return -ENOMEM;
r = sd_event_new(&m->event);
if (r < 0)
return r;
r = sd_rtnl_open(0, &m->rtnl);
if (r < 0)
return r;
m->udev = udev_new();
if (!m->udev)
return -ENOMEM;
m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
if (!m->udev_monitor)
return -ENOMEM;
m->links = hashmap_new(uint64_hash_func, uint64_compare_func);
if (!m->links)
return -ENOMEM;
LIST_HEAD_INIT(m->networks);
m->network_dirs = strv_new("/etc/systemd/network/",
"/run/systemd/network/",
"/usr/lib/systemd/network",
#ifdef HAVE_SPLIT_USER
"/lib/systemd/network",
#endif
NULL);
if (!m->network_dirs)
return -ENOMEM;
if (!path_strv_canonicalize_uniq(m->network_dirs))
return -ENOMEM;
*ret = m;
m = NULL;
return 0;
}
void manager_free(Manager *m) {
udev_monitor_unref(m->udev_monitor);
udev_unref(m->udev);
sd_event_source_unref(m->udev_event_source);
sd_event_unref(m->event);
hashmap_free(m->links);
strv_free(m->network_dirs);
sd_rtnl_unref(m->rtnl);
free(m);
}
static int manager_process_link(Manager *m, struct udev_device *device) {
Link *link;
int r;
if (streq_ptr(udev_device_get_action(device), "remove")) {
uint64_t ifindex;
ifindex = udev_device_get_ifindex(device);
link = hashmap_get(m->links, &ifindex);
if (!link)
return 0;
link_free(link);
} else {
r = link_add(m, device);
if (r < 0) {
log_error("Could not handle link %s: %s",
udev_device_get_sysname(device),
strerror(-r));
}
}
return 0;
}
int manager_udev_enumerate_links(Manager *m) {
struct udev_list_entry *item = NULL, *first = NULL;
struct udev_enumerate *e;
int r;
assert(m);
e = udev_enumerate_new(m->udev);
if (!e) {
r = -ENOMEM;
goto finish;
}
r = udev_enumerate_add_match_subsystem(e, "net");
if (r < 0)
goto finish;
r = udev_enumerate_add_match_tag(e, "systemd-networkd");
if (r < 0)
goto finish;
r = udev_enumerate_scan_devices(e);
if (r < 0)
goto finish;
first = udev_enumerate_get_list_entry(e);
udev_list_entry_foreach(item, first) {
struct udev_device *d;
int k;
d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
if (!d) {
r = -ENOMEM;
goto finish;
}
k = manager_process_link(m, d);
udev_device_unref(d);
if (k < 0)
r = k;
}
finish:
if (e)
udev_enumerate_unref(e);
return r;
}
static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
Manager *m = userdata;
struct udev_monitor *monitor = m->udev_monitor;
struct udev_device *device;
int r;
device = udev_monitor_receive_device(monitor);
if (!device)
return -ENOMEM;
r = manager_process_link(m, device);
if (r < 0)
return r;
udev_device_unref(device);
return 0;
}
int manager_udev_listen(Manager *m) {
int r;
r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL);
if (r < 0) {
log_error("Could not add udev monitor filter: %s", strerror(-r));
return r;
}
r = udev_monitor_filter_add_match_tag(m->udev_monitor, "systemd-networkd");
if (r < 0) {
log_error("Could not add udev monitor filter: %s", strerror(-r));
return r;
}
r = udev_monitor_enable_receiving(m->udev_monitor);
if (r < 0) {
log_error("Could not enable udev monitor");
return r;
}
r = sd_event_add_io(m->event,
udev_monitor_get_fd(m->udev_monitor),
EPOLLIN, manager_dispatch_link_udev,
m, &m->udev_event_source);
if (r < 0)
return r;
return 0;
}
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