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Systemd/src/network/networkd-manager.c

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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 <sys/socket.h>
#include <linux/if.h>
#include "conf-parser.h"
#include "path-util.h"
#include "networkd.h"
#include "networkd-netdev.h"
#include "networkd-link.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"
#include "sd-daemon.h"
/* use 8 MB for receive socket kernel queue. */
#define RCVBUF_SIZE (8*1024*1024)
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 setup_default_address_pool(Manager *m) {
AddressPool *p;
int r;
assert(m);
/* Add in the well-known private address ranges. */
r = address_pool_new_from_string(m, &p, AF_INET6, "fc00::", 7);
if (r < 0)
return r;
r = address_pool_new_from_string(m, &p, AF_INET, "192.168.0.0", 16);
if (r < 0)
return r;
r = address_pool_new_from_string(m, &p, AF_INET, "172.16.0.0", 12);
if (r < 0)
return r;
r = address_pool_new_from_string(m, &p, AF_INET, "10.0.0.0", 8);
if (r < 0)
return r;
return 0;
}
static int systemd_netlink_fd(int *ret) {
int n, fd, rtnl_fd = -1;
n = sd_listen_fds(true);
if (n <= 0)
return -EINVAL;
for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++) {
if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1) > 0) {
if (rtnl_fd >= 0)
return -EINVAL;
rtnl_fd = fd;
}
}
if (rtnl_fd < 0)
return -EINVAL;
*ret = rtnl_fd;
return 0;
}
int manager_new(Manager **ret) {
_cleanup_manager_free_ Manager *m = NULL;
int r, fd;
m = new0(Manager, 1);
if (!m)
return -ENOMEM;
m->state_file = strdup("/run/systemd/netif/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);
sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
if (systemd_netlink_fd(&fd) < 0) {
r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR,
RTNLGRP_IPV6_IFADDR);
if (r < 0)
return r;
r = sd_rtnl_inc_rcvbuf(m->rtnl, RCVBUF_SIZE);
if (r < 0)
return r;
} else {
r = sd_rtnl_new_from_netlink(&m->rtnl, fd);
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;
/* 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->netdevs = hashmap_new(&string_hash_ops);
if (!m->netdevs)
return -ENOMEM;
LIST_HEAD_INIT(m->networks);
r = setup_default_address_pool(m);
if (r < 0)
return r;
*ret = m;
m = NULL;
return 0;
}
void manager_free(Manager *m) {
Network *network;
NetDev *netdev;
Link *link;
AddressPool *pool;
if (!m)
return;
free(m->state_file);
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_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);
while ((pool = m->address_pools))
address_pool_free(pool);
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;
const char *name;
int r, ifindex;
assert(rtnl);
assert(message);
assert(m);
if (sd_rtnl_message_is_error(message)) {
r = sd_rtnl_message_get_errno(message);
if (r < 0)
log_warning_errno(r, "rtnl: could not receive link: %m");
return 0;
}
r = sd_rtnl_message_get_type(message, &type);
if (r < 0) {
log_warning_errno(r, "rtnl: could not get message type: %m");
return 0;
}
r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
if (r < 0) {
log_warning_errno(r, "rtnl: could not get ifindex: %m");
return 0;
} else if (ifindex <= 0) {
log_warning("rtnl: received link message with invalid ifindex: %d", ifindex);
return 0;
} else
link_get(m, ifindex, &link);
r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &name);
if (r < 0) {
log_warning_errno(r, "rtnl: received link message without ifname: %m");
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_warning_errno(r, "could not add new link: %m");
return 0;
}
}
if (netdev) {
/* netdev exists, so make sure the ifindex matches */
r = netdev_set_ifindex(netdev, message);
if (r < 0) {
log_warning_errno(r, "could not set ifindex on netdev: %m");
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;
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)) {
int k;
k = manager_rtnl_process_link(m->rtnl, link, m);
if (k < 0)
r = k;
}
return r;
}
int manager_rtnl_enumerate_addresses(Manager *m) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
sd_rtnl_message *addr;
int r;
assert(m);
assert(m->rtnl);
r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, 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 (addr = reply; addr; addr = sd_rtnl_message_next(addr)) {
int k;
k = link_rtnl_process_address(m->rtnl, addr, 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)
return log_error_errno(r, "Could not add udev monitor filter: %m");
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;
r = sd_event_source_set_description(m->udev_event_source, "networkd-udev");
if (r < 0)
return r;
return 0;
}
int manager_rtnl_listen(Manager *m) {
int r;
assert(m);
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;
}
static int set_put_in_addr(Set *s, const struct in_addr *address) {
char *p;
int r;
assert(s);
r = in_addr_to_string(AF_INET, (const union in_addr_union*) address, &p);
if (r < 0)
return r;
r = set_consume(s, p);
if (r == -EEXIST)
return 0;
return r;
}
static int set_put_in_addrv(Set *s, const struct in_addr *addresses, int n) {
int r, i, c = 0;
assert(s);
assert(n <= 0 || addresses);
for (i = 0; i < n; i++) {
r = set_put_in_addr(s, addresses+i);
if (r < 0)
return r;
c += r;
}
return c;
}
static void print_string_set(FILE *f, const char *field, Set *s) {
bool space = false;
Iterator i;
char *p;
if (set_isempty(s))
return;
fputs(field, f);
SET_FOREACH(p, s, i) {
if (space)
fputc(' ', f);
fputs(p, f);
space = true;
}
fputc('\n', f);
}
int manager_save(Manager *m) {
_cleanup_set_free_free_ Set *dns = NULL, *ntp = NULL, *domains = NULL;
Link *link;
Iterator i;
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
LinkOperationalState operstate = LINK_OPERSTATE_OFF;
const char *operstate_str;
int r;
assert(m);
assert(m->state_file);
/* We add all NTP and DNS server to a set, to filter out duplicates */
dns = set_new(&string_hash_ops);
if (!dns)
return -ENOMEM;
ntp = set_new(&string_hash_ops);
if (!ntp)
return -ENOMEM;
domains = set_new(&string_hash_ops);
if (!domains)
return -ENOMEM;
HASHMAP_FOREACH(link, m->links, i) {
if (link->flags & IFF_LOOPBACK)
continue;
if (link->operstate > operstate)
operstate = link->operstate;
if (!link->network)
continue;
/* First add the static configured entries */
r = set_put_strdupv(dns, link->network->dns);
if (r < 0)
return r;
r = set_put_strdupv(ntp, link->network->ntp);
if (r < 0)
return r;
r = set_put_strdupv(domains, link->network->domains);
if (r < 0)
return r;
if (!link->dhcp_lease)
continue;
/* Secondly, add the entries acquired via DHCP */
if (link->network->dhcp_dns) {
const struct in_addr *addresses;
r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
if (r > 0) {
r = set_put_in_addrv(dns, addresses, r);
if (r < 0)
return r;
} else if (r < 0 && r != -ENOENT)
return r;
}
if (link->network->dhcp_ntp) {
const struct in_addr *addresses;
r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
if (r > 0) {
r = set_put_in_addrv(ntp, addresses, r);
if (r < 0)
return r;
} else if (r < 0 && r != -ENOENT)
return r;
}
if (link->network->dhcp_domains) {
const char *domainname;
r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
if (r >= 0) {
r = set_put_strdup(domains, domainname);
if (r < 0)
return r;
} else if (r != -ENOENT)
return r;
}
}
operstate_str = link_operstate_to_string(operstate);
assert(operstate_str);
r = fopen_temporary(m->state_file, &f, &temp_path);
if (r < 0)
return r;
fchmod(fileno(f), 0644);
fprintf(f,
"# This is private data. Do not parse.\n"
"OPER_STATE=%s\n", operstate_str);
print_string_set(f, "DNS=", dns);
print_string_set(f, "NTP=", ntp);
print_string_set(f, "DOMAINS=", domains);
r = fflush_and_check(f);
if (r < 0)
goto fail;
if (rename(temp_path, m->state_file) < 0) {
r = -errno;
goto fail;
}
return 0;
fail:
log_error_errno(r, "Failed to save network state to %s: %m", m->state_file);
unlink(m->state_file);
unlink(temp_path);
return r;
}
int manager_address_pool_acquire(Manager *m, int family, unsigned prefixlen, union in_addr_union *found) {
AddressPool *p;
int r;
assert(m);
assert(prefixlen > 0);
assert(found);
LIST_FOREACH(address_pools, p, m->address_pools) {
if (p->family != family)
continue;
r = address_pool_acquire(p, prefixlen, found);
if (r != 0)
return r;
}
return 0;
}
const char *address_family_boolean_to_string(AddressFamilyBoolean b) {
if (b == ADDRESS_FAMILY_YES ||
b == ADDRESS_FAMILY_NO)
return yes_no(b == ADDRESS_FAMILY_YES);
if (b == ADDRESS_FAMILY_IPV4)
return "ipv4";
if (b == ADDRESS_FAMILY_IPV6)
return "ipv6";
return NULL;
}
AddressFamilyBoolean address_family_boolean_from_string(const char *s) {
int r;
/* Make this a true superset of a boolean */
r = parse_boolean(s);
if (r > 0)
return ADDRESS_FAMILY_YES;
if (r == 0)
return ADDRESS_FAMILY_NO;
if (streq(s, "ipv4"))
return ADDRESS_FAMILY_IPV4;
if (streq(s, "ipv6"))
return ADDRESS_FAMILY_IPV6;
return _ADDRESS_FAMILY_BOOLEAN_INVALID;
}
DEFINE_CONFIG_PARSE_ENUM(config_parse_address_family_boolean, address_family_boolean, AddressFamilyBoolean, "Failed to parse option");
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