networkd-manager.c revision 091a364c802e34a58f3260c9cb5db9b75c62215c
/*-*- 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 <sys/socket.h>
#include <linux/if.h>
#include <libkmod.h>
#include "conf-parser.h"
#include "path-util.h"
#include "networkd.h"
#include "network-internal.h"
#include "libudev-private.h"
#include "udev-util.h"
#include "rtnl-util.h"
#include "mkdir.h"
#include "virt.h"
#include "sd-rtnl.h"
const char* const network_dirs[] = {
"/etc/systemd/network",
"/run/systemd/network",
"/usr/lib/systemd/network",
#ifdef HAVE_SPLIT_USR
"/lib/systemd/network",
#endif
NULL};
static int dispatch_sigterm(sd_event_source *es, const struct signalfd_siginfo *si, void *userdata) {
Manager *m = userdata;
assert(m);
log_received_signal(LOG_INFO, si);
sd_event_exit(m->event, 0);
return 0;
}
static int setup_signals(Manager *m) {
sigset_t mask;
int r;
assert(m);
assert_se(sigemptyset(&mask) == 0);
sigset_add_many(&mask, SIGINT, SIGTERM, -1);
assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
r = sd_event_add_signal(m->event, &m->sigterm_event_source, SIGTERM, dispatch_sigterm, m);
if (r < 0)
return r;
r = sd_event_add_signal(m->event, &m->sigint_event_source, SIGINT, dispatch_sigterm, m);
if (r < 0)
return r;
return 0;
}
int manager_new(Manager **ret) {
_cleanup_manager_free_ Manager *m = NULL;
int r;
m = new0(Manager, 1);
if (!m)
return -ENOMEM;
m->state_file = strdup("/run/systemd/network/state");
if (!m->state_file)
return -ENOMEM;
r = sd_event_default(&m->event);
if (r < 0)
return r;
sd_event_set_watchdog(m->event, true);
r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR,
RTNLGRP_IPV6_IFADDR);
if (r < 0)
return r;
r = sd_bus_default_system(&m->bus);
if (r < 0 && r != -ENOENT) /* TODO: drop when we can rely on kdbus */
return r;
r = setup_signals(m);
if (r < 0)
return r;
/* udev does not initialize devices inside containers,
* so we rely on them being already initialized before
* entering the container */
if (detect_container(NULL) <= 0) {
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->kmod_ctx = kmod_new(NULL, NULL);
if (!m->kmod_ctx)
return -ENOMEM;
m->links = hashmap_new(uint64_hash_func, uint64_compare_func);
if (!m->links)
return -ENOMEM;
m->netdevs = hashmap_new(string_hash_func, string_compare_func);
if (!m->netdevs)
return -ENOMEM;
LIST_HEAD_INIT(m->networks);
*ret = m;
m = NULL;
return 0;
}
void manager_free(Manager *m) {
Network *network;
NetDev *netdev;
Link *link;
if (!m)
return;
free(m->state_file);
kmod_unref(m->kmod_ctx);
udev_monitor_unref(m->udev_monitor);
udev_unref(m->udev);
sd_bus_unref(m->bus);
sd_event_source_unref(m->udev_event_source);
sd_event_source_unref(m->sigterm_event_source);
sd_event_source_unref(m->sigint_event_source);
sd_event_unref(m->event);
while ((link = hashmap_first(m->links)))
link_unref(link);
hashmap_free(m->links);
while ((network = m->networks))
network_free(network);
while ((netdev = hashmap_first(m->netdevs)))
netdev_unref(netdev);
hashmap_free(m->netdevs);
sd_rtnl_unref(m->rtnl);
free(m);
}
int manager_load_config(Manager *m) {
int r;
/* update timestamp */
paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true);
r = netdev_load(m);
if (r < 0)
return r;
r = network_load(m);
if (r < 0)
return r;
return 0;
}
bool manager_should_reload(Manager *m) {
return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false);
}
static int manager_udev_process_link(Manager *m, struct udev_device *device) {
Link *link = NULL;
int r, ifindex;
assert(m);
assert(device);
if (!streq_ptr(udev_device_get_action(device), "add"))
return 0;
ifindex = udev_device_get_ifindex(device);
if (ifindex <= 0) {
log_debug("ignoring udev ADD event for device with invalid ifindex");
return 0;
}
r = link_get(m, ifindex, &link);
if (r == -ENODEV)
return 0;
else if (r < 0)
return r;
r = link_initialized(link, device);
if (r < 0)
return r;
return 0;
}
static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) {
Manager *m = userdata;
Link *link = NULL;
NetDev *netdev = NULL;
uint16_t type;
char *name;
int r, ifindex;
assert(rtnl);
assert(message);
assert(m);
r = sd_rtnl_message_get_type(message, &type);
if (r < 0) {
log_warning("rtnl: could not get message type");
return 0;
}
r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
if (r < 0 || ifindex <= 0) {
log_warning("rtnl: received link message without valid ifindex");
return 0;
} else
link_get(m, ifindex, &link);
r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &name);
if (r < 0 || !name) {
log_warning("rtnl: received link message without valid ifname");
return 0;
} else
netdev_get(m, name, &netdev);
switch (type) {
case RTM_NEWLINK:
if (!link) {
/* link is new, so add it */
r = link_add(m, message, &link);
if (r < 0) {
log_debug("could not add new link");
return 0;
}
}
if (netdev) {
/* netdev exists, so make sure the ifindex matches */
r = netdev_set_ifindex(netdev, message);
if (r < 0) {
log_debug("could not set ifindex on netdev");
return 0;
}
}
r = link_update(link, message);
if (r < 0)
return 0;
break;
case RTM_DELLINK:
link_drop(link);
netdev_drop(netdev);
break;
default:
assert_not_reached("Received invalid RTNL message type.");
}
return 1;
}
int manager_rtnl_enumerate_links(Manager *m) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
sd_rtnl_message *link;
int r, k;
assert(m);
assert(m->rtnl);
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 (link = reply; link; link = sd_rtnl_message_next(link)) {
uint16_t type;
k = sd_rtnl_message_get_type(link, &type);
if (k < 0)
return k;
if (type != RTM_NEWLINK)
continue;
k = manager_rtnl_process_link(m->rtnl, link, m);
if (k < 0)
r = k;
}
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;
_cleanup_udev_device_unref_ struct udev_device *device = NULL;
device = udev_monitor_receive_device(monitor);
if (!device)
return -ENOMEM;
manager_udev_process_link(m, device);
return 0;
}
int manager_udev_listen(Manager *m) {
int r;
if (detect_container(NULL) > 0)
return 0;
assert(m->udev_monitor);
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_enable_receiving(m->udev_monitor);
if (r < 0) {
log_error("Could not enable udev monitor");
return r;
}
r = sd_event_add_io(m->event,
&m->udev_event_source,
udev_monitor_get_fd(m->udev_monitor),
EPOLLIN, manager_dispatch_link_udev,
m);
if (r < 0)
return r;
return 0;
}
int manager_rtnl_listen(Manager *m) {
int 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, &manager_rtnl_process_link, m);
if (r < 0)
return r;
r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, &manager_rtnl_process_link, m);
if (r < 0)
return r;
r = sd_rtnl_add_match(m->rtnl, RTM_NEWADDR, &link_rtnl_process_address, m);
if (r < 0)
return r;
r = sd_rtnl_add_match(m->rtnl, RTM_DELADDR, &link_rtnl_process_address, m);
if (r < 0)
return r;
return 0;
}
int manager_bus_listen(Manager *m) {
int r;
assert(m->event);
if (!m->bus) /* TODO: drop when we can rely on kdbus */
return 0;
r = sd_bus_attach_event(m->bus, m->event, 0);
if (r < 0)
return r;
return 0;
}
int manager_save(Manager *m) {
Link *link;
Iterator i;
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *oper_state = "unknown";
bool dormant = false, carrier = false;
int r;
assert(m);
assert(m->state_file);
HASHMAP_FOREACH(link, m->links, i) {
if (link->flags & IFF_LOOPBACK)
continue;
if (link_has_carrier(link->flags, link->operstate))
carrier = true;
else if (link->operstate == IF_OPER_DORMANT)
dormant = true;
}
if (carrier)
oper_state = "carrier";
else if (dormant)
oper_state = "dormant";
r = fopen_temporary(m->state_file, &f, &temp_path);
if (r < 0)
goto finish;
fchmod(fileno(f), 0644);
fprintf(f,
"# This is private data. Do not parse.\n"
"OPER_STATE=%s\n", oper_state);
fflush(f);
if (ferror(f) || rename(temp_path, m->state_file) < 0) {
r = -errno;
unlink(m->state_file);
unlink(temp_path);
}
finish:
if (r < 0)
log_error("Failed to save network state to %s: %s", m->state_file, strerror(-r));
return r;
}