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Systemd/src/network/networkd-manager.c

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/***
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 <linux/fib_rules.h>
#include "sd-daemon.h"
#include "sd-netlink.h"
#include "alloc-util.h"
#include "bus-util.h"
#include "conf-parser.h"
#include "def.h"
#include "dns-domain.h"
#include "fd-util.h"
#include "fileio.h"
#include "libudev-private.h"
#include "local-addresses.h"
#include "netlink-util.h"
#include "networkd-manager.h"
#include "ordered-set.h"
#include "path-util.h"
#include "set.h"
#include "udev-util.h"
#include "virt.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",
#if 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 on_bus_retry(sd_event_source *s, usec_t usec, void *userdata) {
Manager *m = userdata;
assert(s);
assert(m);
m->bus_retry_event_source = sd_event_source_unref(m->bus_retry_event_source);
manager_connect_bus(m);
return 0;
}
static int manager_reset_all(Manager *m) {
Link *link;
Iterator i;
int r;
assert(m);
HASHMAP_FOREACH(link, m->links, i) {
r = link_carrier_reset(link);
if (r < 0)
log_link_warning_errno(link, r, "Could not reset carrier: %m");
}
return 0;
}
static int match_prepare_for_sleep(sd_bus_message *message, void *userdata, sd_bus_error *ret_error) {
Manager *m = userdata;
int b, r;
assert(message);
r = sd_bus_message_read(message, "b", &b);
if (r < 0) {
log_debug_errno(r, "Failed to parse PrepareForSleep signal: %m");
return 0;
}
if (b)
return 0;
log_debug("Coming back from suspend, resetting all connections...");
manager_reset_all(m);
return 0;
}
int manager_connect_bus(Manager *m) {
int r;
assert(m);
r = sd_bus_default_system(&m->bus);
if (r < 0) {
/* We failed to connect? Yuck, we must be in early
* boot. Let's try in 5s again. */
log_debug_errno(r, "Failed to connect to bus, trying again in 5s: %m");
r = sd_event_add_time(m->event, &m->bus_retry_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + 5*USEC_PER_SEC, 0, on_bus_retry, m);
if (r < 0)
return log_error_errno(r, "Failed to install bus reconnect time event: %m");
return 0;
}
if (r < 0)
return r;
r = sd_bus_add_match(m->bus, &m->prepare_for_sleep_slot,
"type='signal',"
"sender='org.freedesktop.login1',"
"interface='org.freedesktop.login1.Manager',"
"member='PrepareForSleep',"
"path='/org/freedesktop/login1'",
match_prepare_for_sleep,
m);
if (r < 0)
return log_error_errno(r, "Failed to add match for PrepareForSleep: %m");
r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/network1", "org.freedesktop.network1.Manager", manager_vtable, m);
if (r < 0)
return log_error_errno(r, "Failed to add manager object vtable: %m");
r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/link", "org.freedesktop.network1.Link", link_vtable, link_object_find, m);
if (r < 0)
return log_error_errno(r, "Failed to add link object vtable: %m");
r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/link", link_node_enumerator, m);
if (r < 0)
return log_error_errno(r, "Failed to add link enumerator: %m");
r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/network", "org.freedesktop.network1.Network", network_vtable, network_object_find, m);
if (r < 0)
return log_error_errno(r, "Failed to add network object vtable: %m");
r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/network", network_node_enumerator, m);
if (r < 0)
return log_error_errno(r, "Failed to add network enumerator: %m");
r = sd_bus_request_name(m->bus, "org.freedesktop.network1", 0);
if (r < 0)
return log_error_errno(r, "Failed to register name: %m");
r = sd_bus_attach_event(m->bus, m->event, 0);
if (r < 0)
return log_error_errno(r, "Failed to attach bus to event loop: %m");
/* Did we get a timezone or transient hostname from DHCP while D-Bus wasn't up yet? */
if (m->dynamic_hostname) {
r = manager_set_hostname(m, m->dynamic_hostname);
if (r < 0)
return r;
}
if (m->dynamic_timezone) {
r = manager_set_timezone(m, m->dynamic_timezone);
if (r < 0)
return r;
}
return 0;
}
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_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;
}
static int manager_connect_udev(Manager *m) {
int r;
/* udev does not initialize devices inside containers,
* so we rely on them being already initialized before
* entering the container */
if (detect_container() > 0)
return 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;
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_process_route(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
Manager *m = userdata;
Link *link = NULL;
uint16_t type;
uint32_t ifindex, priority = 0;
unsigned char protocol, scope, tos, table, rt_type;
int family;
unsigned char dst_prefixlen, src_prefixlen;
union in_addr_union dst = {}, gw = {}, src = {}, prefsrc = {};
Route *route = NULL;
int r;
assert(rtnl);
assert(message);
assert(m);
if (sd_netlink_message_is_error(message)) {
r = sd_netlink_message_get_errno(message);
if (r < 0)
log_warning_errno(r, "rtnl: failed to receive route: %m");
return 0;
}
r = sd_netlink_message_get_type(message, &type);
if (r < 0) {
log_warning_errno(r, "rtnl: could not get message type: %m");
return 0;
} else if (!IN_SET(type, RTM_NEWROUTE, RTM_DELROUTE)) {
log_warning("rtnl: received unexpected message type when processing route");
return 0;
}
r = sd_netlink_message_read_u32(message, RTA_OIF, &ifindex);
if (r == -ENODATA) {
log_debug("rtnl: received route without ifindex, ignoring");
return 0;
} else if (r < 0) {
log_warning_errno(r, "rtnl: could not get ifindex from route, ignoring: %m");
return 0;
} else if (ifindex <= 0) {
log_warning("rtnl: received route message with invalid ifindex, ignoring: %d", ifindex);
return 0;
} else {
r = link_get(m, ifindex, &link);
if (r < 0 || !link) {
/* when enumerating we might be out of sync, but we will
* get the route again, so just ignore it */
if (!m->enumerating)
log_warning("rtnl: received route for nonexistent link (%d), ignoring", ifindex);
return 0;
}
}
r = sd_rtnl_message_route_get_family(message, &family);
if (r < 0 || !IN_SET(family, AF_INET, AF_INET6)) {
log_link_warning(link, "rtnl: received address with invalid family, ignoring.");
return 0;
}
r = sd_rtnl_message_route_get_protocol(message, &protocol);
if (r < 0) {
log_warning_errno(r, "rtnl: could not get route protocol: %m");
return 0;
}
switch (family) {
case AF_INET:
r = sd_netlink_message_read_in_addr(message, RTA_DST, &dst.in);
if (r < 0 && r != -ENODATA) {
log_link_warning_errno(link, r, "rtnl: received route without valid destination, ignoring: %m");
return 0;
}
r = sd_netlink_message_read_in_addr(message, RTA_GATEWAY, &gw.in);
if (r < 0 && r != -ENODATA) {
log_link_warning_errno(link, r, "rtnl: received route with invalid gateway, ignoring: %m");
return 0;
}
r = sd_netlink_message_read_in_addr(message, RTA_SRC, &src.in);
if (r < 0 && r != -ENODATA) {
log_link_warning_errno(link, r, "rtnl: received route with invalid source, ignoring: %m");
return 0;
}
r = sd_netlink_message_read_in_addr(message, RTA_PREFSRC, &prefsrc.in);
if (r < 0 && r != -ENODATA) {
log_link_warning_errno(link, r, "rtnl: received route with invalid preferred source, ignoring: %m");
return 0;
}
break;
case AF_INET6:
r = sd_netlink_message_read_in6_addr(message, RTA_DST, &dst.in6);
if (r < 0 && r != -ENODATA) {
log_link_warning_errno(link, r, "rtnl: received route without valid destination, ignoring: %m");
return 0;
}
r = sd_netlink_message_read_in6_addr(message, RTA_GATEWAY, &gw.in6);
if (r < 0 && r != -ENODATA) {
log_link_warning_errno(link, r, "rtnl: received route with invalid gateway, ignoring: %m");
return 0;
}
r = sd_netlink_message_read_in6_addr(message, RTA_SRC, &src.in6);
if (r < 0 && r != -ENODATA) {
log_link_warning_errno(link, r, "rtnl: received route with invalid source, ignoring: %m");
return 0;
}
r = sd_netlink_message_read_in6_addr(message, RTA_PREFSRC, &prefsrc.in6);
if (r < 0 && r != -ENODATA) {
log_link_warning_errno(link, r, "rtnl: received route with invalid preferred source, ignoring: %m");
return 0;
}
break;
default:
assert_not_reached("Received unsupported address family");
return 0;
}
r = sd_rtnl_message_route_get_dst_prefixlen(message, &dst_prefixlen);
if (r < 0) {
log_link_warning_errno(link, r, "rtnl: received route with invalid destination prefixlen, ignoring: %m");
return 0;
}
r = sd_rtnl_message_route_get_src_prefixlen(message, &src_prefixlen);
if (r < 0) {
log_link_warning_errno(link, r, "rtnl: received route with invalid source prefixlen, ignoring: %m");
return 0;
}
r = sd_rtnl_message_route_get_scope(message, &scope);
if (r < 0) {
log_link_warning_errno(link, r, "rtnl: received route with invalid scope, ignoring: %m");
return 0;
}
r = sd_rtnl_message_route_get_tos(message, &tos);
if (r < 0) {
log_link_warning_errno(link, r, "rtnl: received route with invalid tos, ignoring: %m");
return 0;
}
r = sd_rtnl_message_route_get_type(message, &rt_type);
if (r < 0) {
log_link_warning_errno(link, r, "rtnl: received route with invalid type, ignoring: %m");
return 0;
}
r = sd_rtnl_message_route_get_table(message, &table);
if (r < 0) {
log_link_warning_errno(link, r, "rtnl: received route with invalid table, ignoring: %m");
return 0;
}
r = sd_netlink_message_read_u32(message, RTA_PRIORITY, &priority);
if (r < 0 && r != -ENODATA) {
log_link_warning_errno(link, r, "rtnl: received route with invalid priority, ignoring: %m");
return 0;
}
route_get(link, family, &dst, dst_prefixlen, tos, priority, table, &route);
switch (type) {
case RTM_NEWROUTE:
if (!route) {
/* A route appeared that we did not request */
r = route_add_foreign(link, family, &dst, dst_prefixlen, tos, priority, table, &route);
if (r < 0)
return 0;
}
route_update(route, &src, src_prefixlen, &gw, &prefsrc, scope, rt_type, protocol);
break;
case RTM_DELROUTE:
route_free(route);
break;
default:
assert_not_reached("Received invalid RTNL message type");
}
return 1;
}
int manager_rtnl_process_address(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
Manager *m = userdata;
Link *link = NULL;
uint16_t type;
unsigned char flags;
int family;
unsigned char prefixlen;
unsigned char scope;
union in_addr_union in_addr;
struct ifa_cacheinfo cinfo;
Address *address = NULL;
char buf[INET6_ADDRSTRLEN], valid_buf[FORMAT_TIMESPAN_MAX];
const char *valid_str = NULL;
int r, ifindex;
assert(rtnl);
assert(message);
assert(m);
if (sd_netlink_message_is_error(message)) {
r = sd_netlink_message_get_errno(message);
if (r < 0)
log_warning_errno(r, "rtnl: failed to receive address: %m");
return 0;
}
r = sd_netlink_message_get_type(message, &type);
if (r < 0) {
log_warning_errno(r, "rtnl: could not get message type: %m");
return 0;
} else if (!IN_SET(type, RTM_NEWADDR, RTM_DELADDR)) {
log_warning("rtnl: received unexpected message type when processing address");
return 0;
}
r = sd_rtnl_message_addr_get_ifindex(message, &ifindex);
if (r < 0) {
log_warning_errno(r, "rtnl: could not get ifindex from address: %m");
return 0;
} else if (ifindex <= 0) {
log_warning("rtnl: received address message with invalid ifindex: %d", ifindex);
return 0;
} else {
r = link_get(m, ifindex, &link);
if (r < 0 || !link) {
/* when enumerating we might be out of sync, but we will
* get the address again, so just ignore it */
if (!m->enumerating)
log_warning("rtnl: received address for nonexistent link (%d), ignoring", ifindex);
return 0;
}
}
r = sd_rtnl_message_addr_get_family(message, &family);
if (r < 0 || !IN_SET(family, AF_INET, AF_INET6)) {
log_link_warning(link, "rtnl: received address with invalid family, ignoring.");
return 0;
}
r = sd_rtnl_message_addr_get_prefixlen(message, &prefixlen);
if (r < 0) {
log_link_warning_errno(link, r, "rtnl: received address with invalid prefixlen, ignoring: %m");
return 0;
}
r = sd_rtnl_message_addr_get_scope(message, &scope);
if (r < 0) {
log_link_warning_errno(link, r, "rtnl: received address with invalid scope, ignoring: %m");
return 0;
}
r = sd_rtnl_message_addr_get_flags(message, &flags);
if (r < 0) {
log_link_warning_errno(link, r, "rtnl: received address with invalid flags, ignoring: %m");
return 0;
}
switch (family) {
case AF_INET:
r = sd_netlink_message_read_in_addr(message, IFA_LOCAL, &in_addr.in);
if (r < 0) {
log_link_warning_errno(link, r, "rtnl: received address without valid address, ignoring: %m");
return 0;
}
break;
case AF_INET6:
r = sd_netlink_message_read_in6_addr(message, IFA_ADDRESS, &in_addr.in6);
if (r < 0) {
log_link_warning_errno(link, r, "rtnl: received address without valid address, ignoring: %m");
return 0;
}
break;
default:
log_link_debug(link, "rtnl: ignoring unsupported address family: %d", family);
}
if (!inet_ntop(family, &in_addr, buf, INET6_ADDRSTRLEN)) {
log_link_warning(link, "Could not print address");
return 0;
}
r = sd_netlink_message_read_cache_info(message, IFA_CACHEINFO, &cinfo);
if (r >= 0) {
if (cinfo.ifa_valid != CACHE_INFO_INFINITY_LIFE_TIME)
valid_str = format_timespan(valid_buf, FORMAT_TIMESPAN_MAX,
cinfo.ifa_valid * USEC_PER_SEC,
USEC_PER_SEC);
}
address_get(link, family, &in_addr, prefixlen, &address);
switch (type) {
case RTM_NEWADDR:
if (address)
log_link_debug(link, "Updating address: %s/%u (valid %s%s)", buf, prefixlen,
valid_str ? "for " : "forever", valid_str ?: "");
else {
/* An address appeared that we did not request */
r = address_add_foreign(link, family, &in_addr, prefixlen, &address);
if (r < 0) {
log_link_warning_errno(link, r, "Failed to add address %s/%u: %m", buf, prefixlen);
return 0;
} else
log_link_debug(link, "Adding address: %s/%u (valid %s%s)", buf, prefixlen,
valid_str ? "for " : "forever", valid_str ?: "");
}
address_update(address, flags, scope, &cinfo);
break;
case RTM_DELADDR:
if (address) {
log_link_debug(link, "Removing address: %s/%u (valid %s%s)", buf, prefixlen,
valid_str ? "for " : "forever", valid_str ?: "");
address_drop(address);
} else
log_link_warning(link, "Removing non-existent address: %s/%u (valid %s%s)", buf, prefixlen,
valid_str ? "for " : "forever", valid_str ?: "");
break;
default:
assert_not_reached("Received invalid RTNL message type");
}
return 1;
}
static int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_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_netlink_message_is_error(message)) {
r = sd_netlink_message_get_errno(message);
if (r < 0)
log_warning_errno(r, "rtnl: Could not receive link: %m");
return 0;
}
r = sd_netlink_message_get_type(message, &type);
if (r < 0) {
log_warning_errno(r, "rtnl: Could not get message type: %m");
return 0;
} else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
log_warning("rtnl: Received unexpected message type when processing link");
return 0;
}
r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
if (r < 0) {
log_warning_errno(r, "rtnl: Could not get ifindex from link: %m");
return 0;
} else if (ifindex <= 0) {
log_warning("rtnl: received link message with invalid ifindex: %d", ifindex);
return 0;
}
r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
if (r < 0) {
log_warning_errno(r, "rtnl: Received link message without ifname: %m");
return 0;
}
(void) link_get(m, ifindex, &link);
(void) 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_process_rule(sd_netlink *rtnl, sd_netlink_message *message, void *userdata) {
uint8_t tos = 0, to_prefixlen = 0, from_prefixlen = 0;
RoutingPolicyRule *rule = NULL;
union in_addr_union to, from;
uint32_t fwmark = 0, table = 0;
Manager *m = userdata;
uint16_t type;
int family;
int r;
assert(rtnl);
assert(message);
assert(m);
if (sd_netlink_message_is_error(message)) {
r = sd_netlink_message_get_errno(message);
if (r < 0)
log_warning_errno(r, "rtnl: failed to receive rule: %m");
return 0;
}
r = sd_netlink_message_get_type(message, &type);
if (r < 0) {
log_warning_errno(r, "rtnl: could not get message type: %m");
return 0;
} else if (!IN_SET(type, RTM_NEWRULE, RTM_DELRULE)) {
log_warning("rtnl: received unexpected message type '%u' when processing rule.", type);
return 0;
}
r = sd_rtnl_message_get_family(message, &family);
if (r < 0) {
log_warning_errno(r, "rtnl: could not get rule family: %m");
return 0;
} else if (!IN_SET(family, AF_INET, AF_INET6)) {
log_debug("rtnl: received address with invalid family %u, ignoring.", family);
return 0;
}
switch (family) {
case AF_INET:
r = sd_netlink_message_read_in_addr(message, FRA_SRC, &from.in);
if (r >= 0) {
r = sd_rtnl_message_routing_policy_rule_get_rtm_src_prefixlen(message, &from_prefixlen);
if (r < 0)
log_warning_errno(r, "rtnl: failed to retrive rule from prefix length: %m");
}
r = sd_netlink_message_read_in_addr(message, FRA_DST, &to.in);
if (r >= 0) {
r = sd_rtnl_message_routing_policy_rule_get_rtm_dst_prefixlen(message, &to_prefixlen);
if (r < 0)
log_warning_errno(r, "rtnl: failed to retrive rule to prefix length: %m");
}
break;
case AF_INET6:
r = sd_netlink_message_read_in6_addr(message, FRA_SRC, &from.in6);
if (r >= 0) {
r = sd_rtnl_message_routing_policy_rule_get_rtm_src_prefixlen(message, &from_prefixlen);
if (r < 0)
log_warning_errno(r, "rtnl: failed to retrive rule from prefix length: %m");
}
r = sd_netlink_message_read_in6_addr(message, FRA_DST, &to.in6);
if (r >= 0) {
r = sd_rtnl_message_routing_policy_rule_get_rtm_dst_prefixlen(message, &to_prefixlen);
if (r < 0)
log_warning_errno(r, "rtnl: failed to retrive rule to prefix length: %m");
}
break;
default:
assert_not_reached("Received unsupported address family");
}
if (from_prefixlen == 0 && to_prefixlen == 0)
return 0;
(void) sd_netlink_message_read_u32(message, FRA_FWMARK, &fwmark);
(void) sd_netlink_message_read_u32(message, FRA_TABLE, &table);
(void) sd_rtnl_message_routing_policy_rule_get_tos(message, &tos);
(void) routing_policy_rule_get(m, family, &from, from_prefixlen, &to, to_prefixlen, tos, fwmark, table, &rule);
switch (type) {
case RTM_NEWRULE:
if(!rule) {
r = routing_policy_rule_add_foreign(m, family, &from, from_prefixlen, &to, to_prefixlen, tos, fwmark, table, &rule);
if (r < 0) {
log_warning_errno(r, "Could not add rule: %m");
return 0;
}
}
break;
case RTM_DELRULE:
routing_policy_rule_free(rule);
break;
default:
assert_not_reached("Received invalid RTNL message type");
}
return 1;
}
static int systemd_netlink_fd(void) {
int n, fd, rtnl_fd = -EINVAL;
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;
}
}
return rtnl_fd;
}
static int manager_connect_rtnl(Manager *m) {
int fd, r;
assert(m);
fd = systemd_netlink_fd();
if (fd < 0)
r = sd_netlink_open(&m->rtnl);
else
r = sd_netlink_open_fd(&m->rtnl, fd);
if (r < 0)
return r;
r = sd_netlink_inc_rcvbuf(m->rtnl, RCVBUF_SIZE);
if (r < 0)
return r;
r = sd_netlink_attach_event(m->rtnl, m->event, 0);
if (r < 0)
return r;
r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
if (r < 0)
return r;
r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, &manager_rtnl_process_link, m);
if (r < 0)
return r;
r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, &manager_rtnl_process_address, m);
if (r < 0)
return r;
r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, &manager_rtnl_process_address, m);
if (r < 0)
return r;
r = sd_netlink_add_match(m->rtnl, RTM_NEWROUTE, &manager_rtnl_process_route, m);
if (r < 0)
return r;
r = sd_netlink_add_match(m->rtnl, RTM_DELROUTE, &manager_rtnl_process_route, m);
if (r < 0)
return r;
r = sd_netlink_add_match(m->rtnl, RTM_NEWRULE, &manager_rtnl_process_rule, m);
if (r < 0)
return r;
r = sd_netlink_add_match(m->rtnl, RTM_DELRULE, &manager_rtnl_process_rule, m);
if (r < 0)
return r;
return 0;
}
static int ordered_set_put_in_addr_data(OrderedSet *s, const struct in_addr_data *address) {
char *p;
int r;
assert(s);
assert(address);
r = in_addr_to_string(address->family, &address->address, &p);
if (r < 0)
return r;
r = ordered_set_consume(s, p);
if (r == -EEXIST)
return 0;
return r;
}
static int ordered_set_put_in_addr_datav(OrderedSet *s, const struct in_addr_data *addresses, unsigned n) {
int r, c = 0;
unsigned i;
assert(s);
assert(addresses || n == 0);
for (i = 0; i < n; i++) {
r = ordered_set_put_in_addr_data(s, addresses+i);
if (r < 0)
return r;
c += r;
}
return c;
}
static int ordered_set_put_in4_addr(OrderedSet *s, const struct in_addr *address) {
char *p;
int r;
assert(s);
assert(address);
r = in_addr_to_string(AF_INET, (const union in_addr_union*) address, &p);
if (r < 0)
return r;
r = ordered_set_consume(s, p);
if (r == -EEXIST)
return 0;
return r;
}
static int ordered_set_put_in4_addrv(OrderedSet *s, const struct in_addr *addresses, unsigned n) {
int r, c = 0;
unsigned i;
assert(s);
assert(n == 0 || addresses);
for (i = 0; i < n; i++) {
r = ordered_set_put_in4_addr(s, addresses+i);
if (r < 0)
return r;
c += r;
}
return c;
}
static void print_string_set(FILE *f, const char *field, OrderedSet *s) {
bool space = false;
Iterator i;
char *p;
if (ordered_set_isempty(s))
return;
fputs_unlocked(field, f);
ORDERED_SET_FOREACH(p, s, i)
fputs_with_space(f, p, NULL, &space);
fputc_unlocked('\n', f);
}
static int manager_save(Manager *m) {
_cleanup_ordered_set_free_free_ OrderedSet *dns = NULL, *ntp = NULL, *search_domains = NULL, *route_domains = NULL;
RoutingPolicyRule *rule = NULL;
bool space = false;
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 = ordered_set_new(&string_hash_ops);
if (!dns)
return -ENOMEM;
ntp = ordered_set_new(&string_hash_ops);
if (!ntp)
return -ENOMEM;
search_domains = ordered_set_new(&dns_name_hash_ops);
if (!search_domains)
return -ENOMEM;
route_domains = ordered_set_new(&dns_name_hash_ops);
if (!route_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 = ordered_set_put_in_addr_datav(dns, link->network->dns, link->network->n_dns);
if (r < 0)
return r;
r = ordered_set_put_strdupv(ntp, link->network->ntp);
if (r < 0)
return r;
r = ordered_set_put_strdupv(search_domains, link->network->search_domains);
if (r < 0)
return r;
r = ordered_set_put_strdupv(route_domains, link->network->route_domains);
if (r < 0)
return r;
if (!link->dhcp_lease)
continue;
/* Secondly, add the entries acquired via DHCP */
if (link->network->dhcp_use_dns) {
const struct in_addr *addresses;
r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
if (r > 0) {
r = ordered_set_put_in4_addrv(dns, addresses, r);
if (r < 0)
return r;
} else if (r < 0 && r != -ENODATA)
return r;
}
if (link->network->dhcp_use_ntp) {
const struct in_addr *addresses;
r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
if (r > 0) {
r = ordered_set_put_in4_addrv(ntp, addresses, r);
if (r < 0)
return r;
} else if (r < 0 && r != -ENODATA)
return r;
}
if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
const char *domainname;
char **domains = NULL;
OrderedSet *target_domains = (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) ? search_domains : route_domains;
r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
if (r >= 0) {
r = ordered_set_put_strdup(target_domains, domainname);
if (r < 0)
return r;
} else if (r != -ENODATA)
return r;
r = sd_dhcp_lease_get_search_domains(link->dhcp_lease, &domains);
if (r >= 0) {
r = ordered_set_put_strdupv(target_domains, domains);
if (r < 0)
return r;
} else if (r != -ENODATA)
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;
(void) 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=", search_domains);
print_string_set(f, "ROUTE_DOMAINS=", route_domains);
SET_FOREACH(rule, m->rules, i) {
_cleanup_free_ char *from_str = NULL, *to_str = NULL;
fputs("RULE=", f);
if (!in_addr_is_null(rule->family, &rule->from)) {
r = in_addr_to_string(rule->family, &rule->from, &from_str);
if (r < 0)
goto fail;
}
if (!in_addr_is_null(rule->family, &rule->to)) {
r = in_addr_to_string(rule->family, &rule->to, &to_str);
if (r < 0)
goto fail;
}
fprintf(f, "from=%s%s/%hhu to=%s%s/%hhu tos=%hhu fwmark=%"PRIu32"/%"PRIu32" table=%hhu", space ? " " : "", from_str,
rule->from_prefixlen, space ? " " : "", to_str, rule->to_prefixlen, rule->tos, rule->fwmark, rule->fwmask, rule->table);
fputc('\n', f);
}
r = fflush_and_check(f);
if (r < 0)
goto fail;
if (rename(temp_path, m->state_file) < 0) {
r = -errno;
goto fail;
}
if (m->operational_state != operstate) {
m->operational_state = operstate;
r = manager_send_changed(m, "OperationalState", NULL);
if (r < 0)
log_error_errno(r, "Could not emit changed OperationalState: %m");
}
m->dirty = false;
return 0;
fail:
(void) unlink(m->state_file);
(void) unlink(temp_path);
return log_error_errno(r, "Failed to save network state to %s: %m", m->state_file);
}
static int manager_dirty_handler(sd_event_source *s, void *userdata) {
Manager *m = userdata;
Link *link;
Iterator i;
int r;
assert(m);
if (m->dirty)
manager_save(m);
SET_FOREACH(link, m->dirty_links, i) {
r = link_save(link);
if (r >= 0)
link_clean(link);
}
return 1;
}
int manager_new(Manager **ret, sd_event *event) {
_cleanup_manager_free_ Manager *m = NULL;
int r;
m = new0(Manager, 1);
if (!m)
return -ENOMEM;
m->state_file = strdup("/run/systemd/netif/state");
if (!m->state_file)
return -ENOMEM;
m->event = sd_event_ref(event);
r = sd_event_add_post(m->event, NULL, manager_dirty_handler, m);
if (r < 0)
return r;
r = manager_connect_rtnl(m);
if (r < 0)
return r;
r = manager_connect_udev(m);
if (r < 0)
return r;
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;
m->duid.type = DUID_TYPE_EN;
(void) routing_policy_rule_load(m);
*ret = m;
m = NULL;
return 0;
}
void manager_free(Manager *m) {
RoutingPolicyRule *rule;
Network *network;
NetDev *netdev;
Link *link;
AddressPool *pool;
if (!m)
return;
free(m->state_file);
while ((network = m->networks))
network_free(network);
while ((link = hashmap_first(m->links)))
link_unref(link);
hashmap_free(m->links);
hashmap_free(m->networks_by_name);
while ((netdev = hashmap_first(m->netdevs)))
netdev_unref(netdev);
hashmap_free(m->netdevs);
while ((pool = m->address_pools))
address_pool_free(pool);
set_free(m->rules);
set_free(m->rules_foreign);
while ((rule = set_steal_first(m->rules_saved)))
free(rule);
set_free(m->rules_saved);
sd_netlink_unref(m->rtnl);
sd_event_unref(m->event);
sd_event_source_unref(m->udev_event_source);
udev_monitor_unref(m->udev_monitor);
udev_unref(m->udev);
sd_bus_unref(m->bus);
sd_bus_slot_unref(m->prepare_for_sleep_slot);
sd_event_source_unref(m->bus_retry_event_source);
free(m->dynamic_timezone);
free(m->dynamic_hostname);
free(m);
}
int manager_start(Manager *m) {
Link *link;
Iterator i;
assert(m);
/* The dirty handler will deal with future serialization, but the first one
must be done explicitly. */
manager_save(m);
HASHMAP_FOREACH(link, m->links, i)
link_save(link);
return 0;
}
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);
}
int manager_rtnl_enumerate_links(Manager *m) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
sd_netlink_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_netlink_message_request_dump(req, true);
if (r < 0)
return r;
r = sd_netlink_call(m->rtnl, req, 0, &reply);
if (r < 0)
return r;
for (link = reply; link; link = sd_netlink_message_next(link)) {
int k;
m->enumerating = true;
k = manager_rtnl_process_link(m->rtnl, link, m);
if (k < 0)
r = k;
m->enumerating = false;
}
return r;
}
int manager_rtnl_enumerate_addresses(Manager *m) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
sd_netlink_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_netlink_message_request_dump(req, true);
if (r < 0)
return r;
r = sd_netlink_call(m->rtnl, req, 0, &reply);
if (r < 0)
return r;
for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
int k;
m->enumerating = true;
k = manager_rtnl_process_address(m->rtnl, addr, m);
if (k < 0)
r = k;
m->enumerating = false;
}
return r;
}
int manager_rtnl_enumerate_routes(Manager *m) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
sd_netlink_message *route;
int r;
assert(m);
assert(m->rtnl);
r = sd_rtnl_message_new_route(m->rtnl, &req, RTM_GETROUTE, 0, 0);
if (r < 0)
return r;
r = sd_netlink_message_request_dump(req, true);
if (r < 0)
return r;
r = sd_netlink_call(m->rtnl, req, 0, &reply);
if (r < 0)
return r;
for (route = reply; route; route = sd_netlink_message_next(route)) {
int k;
m->enumerating = true;
k = manager_rtnl_process_route(m->rtnl, route, m);
if (k < 0)
r = k;
m->enumerating = false;
}
return r;
}
int manager_rtnl_enumerate_rules(Manager *m) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
sd_netlink_message *rule;
int r;
assert(m);
assert(m->rtnl);
r = sd_rtnl_message_new_routing_policy_rule(m->rtnl, &req, RTM_GETRULE, 0);
if (r < 0)
return r;
r = sd_netlink_message_request_dump(req, true);
if (r < 0)
return r;
r = sd_netlink_call(m->rtnl, req, 0, &reply);
if (r < 0)
return r;
for (rule = reply; rule; rule = sd_netlink_message_next(rule)) {
int k;
m->enumerating = true;
k = manager_rtnl_process_rule(m->rtnl, rule, m);
if (k < 0)
r = k;
m->enumerating = false;
}
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;
}
Link* manager_find_uplink(Manager *m, Link *exclude) {
_cleanup_free_ struct local_address *gateways = NULL;
int n, i;
assert(m);
/* Looks for a suitable "uplink", via black magic: an
* interface that is up and where the default route with the
* highest priority points to. */
n = local_gateways(m->rtnl, 0, AF_UNSPEC, &gateways);
if (n < 0) {
log_warning_errno(n, "Failed to determine list of default gateways: %m");
return NULL;
}
for (i = 0; i < n; i++) {
Link *link;
link = hashmap_get(m->links, INT_TO_PTR(gateways[i].ifindex));
if (!link) {
log_debug("Weird, found a gateway for a link we don't know. Ignoring.");
continue;
}
if (link == exclude)
continue;
if (link->operstate < LINK_OPERSTATE_ROUTABLE)
continue;
return link;
}
return NULL;
}
void manager_dirty(Manager *manager) {
assert(manager);
/* the serialized state in /run is no longer up-to-date */
manager->dirty = true;
}
static int set_hostname_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
Manager *manager = userdata;
const sd_bus_error *e;
assert(m);
assert(manager);
e = sd_bus_message_get_error(m);
if (e)
log_warning_errno(sd_bus_error_get_errno(e), "Could not set hostname: %s", e->message);
return 1;
}
int manager_set_hostname(Manager *m, const char *hostname) {
int r;
log_debug("Setting transient hostname: '%s'", strna(hostname));
if (free_and_strdup(&m->dynamic_hostname, hostname) < 0)
return log_oom();
if (!m->bus) {
/* TODO: replace by assert when we can rely on kdbus */
log_info("Not connected to system bus, ignoring transient hostname.");
return 0;
}
r = sd_bus_call_method_async(
m->bus,
NULL,
"org.freedesktop.hostname1",
"/org/freedesktop/hostname1",
"org.freedesktop.hostname1",
"SetHostname",
set_hostname_handler,
m,
"sb",
hostname,
false);
if (r < 0)
return log_error_errno(r, "Could not set transient hostname: %m");
return 0;
}
static int set_timezone_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
Manager *manager = userdata;
const sd_bus_error *e;
assert(m);
assert(manager);
e = sd_bus_message_get_error(m);
if (e)
log_warning_errno(sd_bus_error_get_errno(e), "Could not set timezone: %s", e->message);
return 1;
}
int manager_set_timezone(Manager *m, const char *tz) {
int r;
assert(m);
assert(tz);
log_debug("Setting system timezone: '%s'", tz);
if (free_and_strdup(&m->dynamic_timezone, tz) < 0)
return log_oom();
if (!m->bus) {
log_info("Not connected to system bus, ignoring timezone.");
return 0;
}
r = sd_bus_call_method_async(
m->bus,
NULL,
"org.freedesktop.timedate1",
"/org/freedesktop/timedate1",
"org.freedesktop.timedate1",
"SetTimezone",
set_timezone_handler,
m,
"sb",
tz,
false);
if (r < 0)
return log_error_errno(r, "Could not set timezone: %m");
return 0;
}
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