networkd-link.c revision fecc80c1ba2eed9dadb9a10c15508c356bcc5fc1
/*-*- 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 <unistd.h>
#include "networkd.h"
#include "libudev-private.h"
#include "udev-util.h"
#include "util.h"
#include "virt.h"
#include "bus-util.h"
#include "network-internal.h"
#include "conf-parser.h"
#include "network-util.h"
#include "dhcp-lease-internal.h"
static int ipv4ll_address_update(Link *link, bool deprecate);
static bool ipv4ll_is_bound(sd_ipv4ll *ll);
static int link_new(Manager *manager, sd_rtnl_message *message, Link **ret) {
_cleanup_link_unref_ Link *link = NULL;
uint16_t type;
char *ifname;
int r, ifindex;
assert(manager);
assert(manager->links);
assert(message);
assert(ret);
r = sd_rtnl_message_get_type(message, &type);
if (r < 0)
return r;
else if (type != RTM_NEWLINK)
return -EINVAL;
r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
if (r < 0)
return r;
else if (ifindex <= 0)
return -EINVAL;
r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &ifname);
if (r < 0)
return r;
link = new0(Link, 1);
if (!link)
return -ENOMEM;
link->n_ref = 1;
link->manager = manager;
link->state = LINK_STATE_INITIALIZING;
link->ifindex = ifindex;
link->ifname = strdup(ifname);
if (!link->ifname)
return -ENOMEM;
r = sd_rtnl_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
if (r < 0)
log_debug_link(link, "MAC address not found for new device, continuing without");
r = asprintf(&link->state_file, "/run/systemd/netif/links/%"PRIu64,
link->ifindex);
if (r < 0)
return -ENOMEM;
r = asprintf(&link->lease_file, "/run/systemd/netif/leases/%"PRIu64,
link->ifindex);
if (r < 0)
return -ENOMEM;
r = hashmap_put(manager->links, &link->ifindex, link);
if (r < 0)
return r;
*ret = link;
link = NULL;
return 0;
}
static void link_free(Link *link) {
Address *address;
if (!link)
return;
while ((address = link->addresses)) {
LIST_REMOVE(addresses, link->addresses, address);
address_free(address);
}
while ((address = link->pool_addresses)) {
LIST_REMOVE(addresses, link->pool_addresses, address);
address_free(address);
}
sd_dhcp_client_unref(link->dhcp_client);
sd_dhcp_lease_unref(link->dhcp_lease);
unlink(link->lease_file);
free(link->lease_file);
sd_ipv4ll_unref(link->ipv4ll);
sd_dhcp6_client_unref(link->dhcp6_client);
sd_icmp6_nd_unref(link->icmp6_router_discovery);
if (link->manager)
hashmap_remove(link->manager->links, &link->ifindex);
free(link->ifname);
unlink(link->state_file);
free(link->state_file);
udev_device_unref(link->udev_device);
free(link);
}
Link *link_unref(Link *link) {
if (link && (-- link->n_ref <= 0))
link_free(link);
return NULL;
}
Link *link_ref(Link *link) {
if (link)
assert_se(++ link->n_ref >= 2);
return link;
}
int link_get(Manager *m, int ifindex, Link **ret) {
Link *link;
uint64_t ifindex_64;
assert(m);
assert(m->links);
assert(ifindex);
assert(ret);
ifindex_64 = ifindex;
link = hashmap_get(m->links, &ifindex_64);
if (!link)
return -ENODEV;
*ret = link;
return 0;
}
void link_drop(Link *link) {
if (!link || link->state == LINK_STATE_LINGER)
return;
link->state = LINK_STATE_LINGER;
log_debug_link(link, "link removed");
link_unref(link);
return;
}
static void link_enter_unmanaged(Link *link) {
assert(link);
log_debug_link(link, "unmanaged");
link->state = LINK_STATE_UNMANAGED;
link_save(link);
}
static int link_stop_clients(Link *link) {
int r = 0, k;
assert(link);
assert(link->manager);
assert(link->manager->event);
if (!link->network)
return 0;
if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V6)) {
assert(link->dhcp_client);
k = sd_dhcp_client_stop(link->dhcp_client);
if (k < 0) {
log_warning_link(link, "Could not stop DHCPv4 client: %s", strerror(-r));
r = k;
}
}
if (link->network->ipv4ll) {
assert(link->ipv4ll);
k = sd_ipv4ll_stop(link->ipv4ll);
if (k < 0) {
log_warning_link(link, "Could not stop IPv4 link-local: %s", strerror(-r));
r = k;
}
}
if (link->network->dhcp_server) {
assert(link->dhcp_server);
k = sd_dhcp_server_stop(link->dhcp_server);
if (k < 0) {
log_warning_link(link, "Could not stop DHCPv4 server: %s", strerror(-r));
r = k;
}
}
if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V6)) {
assert(link->icmp6_router_discovery);
if (link->dhcp6_client) {
k = sd_dhcp6_client_stop(link->dhcp6_client);
if (k < 0) {
log_warning_link(link, "Could not stop DHCPv6 client: %s", strerror(-r));
r = k;
}
}
k = sd_icmp6_nd_stop(link->icmp6_router_discovery);
if (k < 0) {
log_warning_link(link, "Could not stop ICMPv6 router discovery: %s", strerror(-r));
r = k;
}
}
return r;
}
static void link_enter_failed(Link *link) {
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
log_warning_link(link, "failed");
link->state = LINK_STATE_FAILED;
link_stop_clients(link);
link_save(link);
}
static Address* link_find_dhcp_server_address(Link *link) {
Address *address;
assert(link);
assert(link->network);
/* The the first statically configured address if there is any */
LIST_FOREACH(addresses, address, link->network->static_addresses) {
if (address->family != AF_INET)
continue;
if (in_addr_null(address->family, &address->in_addr))
continue;
return address;
}
/* If that didn't work, find a suitable address we got from the pool */
LIST_FOREACH(addresses, address, link->pool_addresses) {
if (address->family != AF_INET)
continue;
return address;
}
return NULL;
}
static int link_enter_configured(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_SETTING_ROUTES);
if (link->network->dhcp_server &&
!sd_dhcp_server_is_running(link->dhcp_server)) {
struct in_addr pool_start;
Address *address;
address = link_find_dhcp_server_address(link);
if (!address) {
log_warning_link(link, "Failed to find suitable address for DHCPv4 server instance.");
link_enter_failed(link);
return 0;
}
log_debug_link(link, "offering DHCPv4 leases");
r = sd_dhcp_server_set_address(link->dhcp_server, &address->in_addr.in);
if (r < 0)
return r;
/* offer 32 addresses starting from the address following the server address */
pool_start.s_addr = htobe32(be32toh(address->in_addr.in.s_addr) + 1);
r = sd_dhcp_server_set_lease_pool(link->dhcp_server,
&pool_start, 32);
if (r < 0)
return r;
/* TODO:
r = sd_dhcp_server_set_router(link->dhcp_server,
&main_address->in_addr.in);
if (r < 0)
return r;
r = sd_dhcp_server_set_prefixlen(link->dhcp_server,
main_address->prefixlen);
if (r < 0)
return r;
*/
r = sd_dhcp_server_start(link->dhcp_server);
if (r < 0) {
log_warning_link(link, "could not start DHCPv4 server "
"instance: %s", strerror(-r));
link_enter_failed(link);
return 0;
}
}
log_info_link(link, "link configured");
link->state = LINK_STATE_CONFIGURED;
link_save(link);
return 0;
}
static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(link->route_messages > 0);
assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
LINK_STATE_LINGER));
link->route_messages --;
if (IN_SET(LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -EEXIST)
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not set route: %s",
IFNAMSIZ,
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
/* we might have received an old reply after moving back to SETTING_ADDRESSES,
* ignore it */
if (link->route_messages == 0 && link->state == LINK_STATE_SETTING_ROUTES) {
log_debug_link(link, "routes set");
link_enter_configured(link);
}
return 1;
}
static int link_set_dhcp_routes(Link *link) {
struct sd_dhcp_route *static_routes;
size_t static_routes_size;
int r;
unsigned i;
assert(link);
r = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes, &static_routes_size);
if (r < 0) {
if (r != -ENOENT)
log_warning_link(link, "DHCP error: could not get routes: %s", strerror(-r));
return r;
}
for (i = 0; i < static_routes_size; i++) {
_cleanup_route_free_ Route *route = NULL;
r = route_new_dynamic(&route);
if (r < 0) {
log_error_link(link, "Could not allocate route: %s",
strerror(-r));
return r;
}
route->family = AF_INET;
route->in_addr.in = static_routes[i].gw_addr;
route->dst_addr.in = static_routes[i].dst_addr;
route->dst_prefixlen = static_routes[i].dst_prefixlen;
route->metrics = DHCP_STATIC_ROUTE_METRIC;
r = route_configure(route, link, &route_handler);
if (r < 0) {
log_warning_link(link,
"could not set host route: %s", strerror(-r));
return r;
}
link_ref(link);
link->route_messages ++;
}
return 0;
}
static int link_enter_set_routes(Link *link) {
Route *rt;
int r;
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_SETTING_ADDRESSES);
link->state = LINK_STATE_SETTING_ROUTES;
if (!link->network->static_routes && !link->dhcp_lease &&
(!link->ipv4ll || ipv4ll_is_bound(link->ipv4ll) == false))
return link_enter_configured(link);
log_debug_link(link, "setting routes");
LIST_FOREACH(routes, rt, link->network->static_routes) {
r = route_configure(rt, link, &route_handler);
if (r < 0) {
log_warning_link(link,
"could not set routes: %s", strerror(-r));
link_enter_failed(link);
return r;
}
link_ref(link);
link->route_messages ++;
}
if (link->ipv4ll && !link->dhcp_lease) {
_cleanup_route_free_ Route *route = NULL;
struct in_addr addr;
r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
if (r < 0 && r != -ENOENT) {
log_warning_link(link, "IPV4LL error: no address: %s",
strerror(-r));
return r;
}
if (r != -ENOENT) {
r = route_new_dynamic(&route);
if (r < 0) {
log_error_link(link, "Could not allocate route: %s",
strerror(-r));
return r;
}
route->family = AF_INET;
route->scope = RT_SCOPE_LINK;
route->metrics = 99;
r = route_configure(route, link, &route_handler);
if (r < 0) {
log_warning_link(link,
"could not set routes: %s", strerror(-r));
link_enter_failed(link);
return r;
}
link_ref(link);
link->route_messages ++;
}
}
if (link->dhcp_lease) {
_cleanup_route_free_ Route *route = NULL;
_cleanup_route_free_ Route *route_gw = NULL;
struct in_addr gateway;
r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
if (r < 0 && r != -ENOENT) {
log_warning_link(link, "DHCP error: could not get gateway: %s",
strerror(-r));
return r;
}
if (r >= 0) {
r = route_new_dynamic(&route);
if (r < 0) {
log_error_link(link, "Could not allocate route: %s",
strerror(-r));
return r;
}
r = route_new_dynamic(&route_gw);
if (r < 0) {
log_error_link(link, "Could not allocate route: %s",
strerror(-r));
return r;
}
/* The dhcp netmask may mask out the gateway. Add an explicit
* route for the gw host so that we can route no matter the
* netmask or existing kernel route tables. */
route_gw->family = AF_INET;
route_gw->dst_addr.in = gateway;
route_gw->dst_prefixlen = 32;
route_gw->scope = RT_SCOPE_LINK;
route_gw->metrics = DHCP_STATIC_ROUTE_METRIC;
r = route_configure(route_gw, link, &route_handler);
if (r < 0) {
log_warning_link(link,
"could not set host route: %s", strerror(-r));
return r;
}
link_ref(link);
link->route_messages ++;
route->family = AF_INET;
route->in_addr.in = gateway;
route->metrics = DHCP_STATIC_ROUTE_METRIC;
r = route_configure(route, link, &route_handler);
if (r < 0) {
log_warning_link(link,
"could not set routes: %s", strerror(-r));
link_enter_failed(link);
return r;
}
link_ref(link);
link->route_messages ++;
}
if (link->network->dhcp_routes)
link_set_dhcp_routes(link);
}
if (link->route_messages == 0) {
link_enter_configured(link);
}
return 0;
}
static int route_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(m);
assert(link);
assert(link->ifname);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -ESRCH)
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not drop route: %s",
IFNAMSIZ,
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
return 0;
}
static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(m);
assert(link);
assert(link->ifname);
assert(link->addr_messages > 0);
assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
LINK_STATE_FAILED, LINK_STATE_LINGER));
link->addr_messages --;
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -EEXIST)
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not set address: %s",
IFNAMSIZ,
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
if (link->addr_messages == 0) {
log_debug_link(link, "addresses set");
link_enter_set_routes(link);
}
return 1;
}
static int link_enter_set_addresses(Link *link) {
Address *ad;
int r;
uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
assert(link);
assert(link->network);
assert(link->state != _LINK_STATE_INVALID);
link->state = LINK_STATE_SETTING_ADDRESSES;
if (!link->network->static_addresses && !link->dhcp_lease &&
(!link->ipv4ll || ipv4ll_is_bound(link->ipv4ll) == false))
return link_enter_set_routes(link);
log_debug_link(link, "setting addresses");
LIST_FOREACH(addresses, ad, link->network->static_addresses) {
r = address_configure(ad, link, &address_handler);
if (r < 0) {
log_warning_link(link,
"could not set addresses: %s", strerror(-r));
link_enter_failed(link);
return r;
}
link_ref(link);
link->addr_messages ++;
}
if (link->ipv4ll && !link->dhcp_lease) {
_cleanup_address_free_ Address *ll_addr = NULL;
struct in_addr addr;
r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
if (r < 0 && r != -ENOENT) {
log_warning_link(link, "IPV4LL error: no address: %s",
strerror(-r));
return r;
}
if (r != -ENOENT) {
r = address_new_dynamic(&ll_addr);
if (r < 0) {
log_error_link(link, "Could not allocate address: %s", strerror(-r));
return r;
}
ll_addr->family = AF_INET;
ll_addr->in_addr.in = addr;
ll_addr->prefixlen = 16;
ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htonl(0xfffffffflu >> ll_addr->prefixlen);
ll_addr->scope = RT_SCOPE_LINK;
r = address_configure(ll_addr, link, &address_handler);
if (r < 0) {
log_warning_link(link,
"could not set addresses: %s", strerror(-r));
link_enter_failed(link);
return r;
}
link_ref(link);
link->addr_messages ++;
}
}
if (link->dhcp_lease) {
_cleanup_address_free_ Address *address = NULL;
struct in_addr addr;
struct in_addr netmask;
unsigned prefixlen;
r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
if (r < 0) {
log_warning_link(link, "DHCP error: no address: %s",
strerror(-r));
return r;
}
if (!link->network->dhcp_critical) {
r = sd_dhcp_lease_get_lifetime(link->dhcp_lease,
&lifetime);
if (r < 0) {
log_warning_link(link, "DHCP error: no lifetime: %s",
strerror(-r));
return r;
}
}
r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
if (r < 0) {
log_warning_link(link, "DHCP error: no netmask: %s",
strerror(-r));
return r;
}
prefixlen = net_netmask_to_prefixlen(&netmask);
r = address_new_dynamic(&address);
if (r < 0) {
log_error_link(link, "Could not allocate address: %s",
strerror(-r));
return r;
}
address->family = AF_INET;
address->in_addr.in = addr;
address->cinfo.ifa_prefered = lifetime;
address->cinfo.ifa_valid = lifetime;
address->prefixlen = prefixlen;
address->broadcast.s_addr = addr.s_addr | ~netmask.s_addr;
/* use update rather than configure so that we will update the lifetime
of an existing address if it has already been configured */
r = address_update(address, link, &address_handler);
if (r < 0) {
log_warning_link(link,
"could not set addresses: %s", strerror(-r));
link_enter_failed(link);
return r;
}
link_ref(link);
link->addr_messages ++;
}
return 0;
}
static int address_update_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(m);
assert(link);
assert(link->ifname);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -ENOENT)
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not update address: %s",
IFNAMSIZ,
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
return 0;
}
static int address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(m);
assert(link);
assert(link->ifname);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -EADDRNOTAVAIL)
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not drop address: %s",
IFNAMSIZ,
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
return 0;
}
static int set_hostname_handler(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_bus_message_get_errno(m);
if (r < 0)
log_warning_link(link, "Could not set hostname: %s", strerror(-r));
return 1;
}
static int link_set_hostname(Link *link, const char *hostname) {
_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
int r = 0;
assert(link);
assert(link->manager);
assert(hostname);
log_debug_link(link, "Setting transient hostname: '%s'", hostname);
if (!link->manager->bus) { /* TODO: replace by assert when we can rely on kdbus */
log_info_link(link, "Not connected to system bus, ignoring transient hostname.");
return 0;
}
r = sd_bus_message_new_method_call(
link->manager->bus,
&m,
"org.freedesktop.hostname1",
"/org/freedesktop/hostname1",
"org.freedesktop.hostname1",
"SetHostname");
if (r < 0)
return r;
r = sd_bus_message_append(m, "sb", hostname, false);
if (r < 0)
return r;
r = sd_bus_call_async(link->manager->bus, NULL, m, set_hostname_handler, link, 0);
if (r < 0) {
log_error_link(link, "Could not set transient hostname: %s", strerror(-r));
return r;
}
link_ref(link);
return 0;
}
static int set_mtu_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(m);
assert(link);
assert(link->ifname);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0)
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not set MTU: %s",
IFNAMSIZ, link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
return 1;
}
static int link_set_mtu(Link *link, uint32_t mtu) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
log_debug_link(link, "setting MTU: %" PRIu32, mtu);
r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
RTM_SETLINK, link->ifindex);
if (r < 0) {
log_error_link(link, "Could not allocate RTM_SETLINK message");
return r;
}
r = sd_rtnl_message_append_u32(req, IFLA_MTU, mtu);
if (r < 0) {
log_error_link(link, "Could not append MTU: %s", strerror(-r));
return r;
}
r = sd_rtnl_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
if (r < 0) {
log_error_link(link,
"Could not send rtnetlink message: %s", strerror(-r));
return r;
}
link_ref(link);
return 0;
}
static int dhcp_lease_lost(Link *link) {
_cleanup_address_free_ Address *address = NULL;
struct in_addr addr;
struct in_addr netmask;
struct in_addr gateway;
unsigned prefixlen;
unsigned i;
int r;
assert(link);
assert(link->dhcp_lease);
log_warning_link(link, "DHCP lease lost");
if (link->network->dhcp_routes) {
struct sd_dhcp_route *routes;
size_t routes_size;
r = sd_dhcp_lease_get_routes(link->dhcp_lease, &routes, &routes_size);
if (r >= 0) {
for (i = 0; i < routes_size; i++) {
_cleanup_route_free_ Route *route = NULL;
r = route_new_dynamic(&route);
if (r >= 0) {
route->family = AF_INET;
route->in_addr.in = routes[i].gw_addr;
route->dst_addr.in = routes[i].dst_addr;
route->dst_prefixlen = routes[i].dst_prefixlen;
route_drop(route, link, &route_drop_handler);
link_ref(link);
}
}
}
}
r = address_new_dynamic(&address);
if (r >= 0) {
r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
if (r >= 0) {
_cleanup_route_free_ Route *route_gw = NULL;
_cleanup_route_free_ Route *route = NULL;
r = route_new_dynamic(&route_gw);
if (r >= 0) {
route_gw->family = AF_INET;
route_gw->dst_addr.in = gateway;
route_gw->dst_prefixlen = 32;
route_gw->scope = RT_SCOPE_LINK;
route_drop(route_gw, link, &route_drop_handler);
link_ref(link);
}
r = route_new_dynamic(&route);
if (r >= 0) {
route->family = AF_INET;
route->in_addr.in = gateway;
route_drop(route, link, &route_drop_handler);
link_ref(link);
}
}
sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
prefixlen = net_netmask_to_prefixlen(&netmask);
address->family = AF_INET;
address->in_addr.in = addr;
address->prefixlen = prefixlen;
address_drop(address, link, &address_drop_handler);
link_ref(link);
}
if (link->network->dhcp_mtu) {
uint16_t mtu;
r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
if (r >= 0 && link->original_mtu != mtu) {
r = link_set_mtu(link, link->original_mtu);
if (r < 0) {
log_warning_link(link, "DHCP error: could not reset MTU");
link_enter_failed(link);
return r;
}
}
}
if (link->network->dhcp_hostname) {
const char *hostname = NULL;
r = sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
if (r >= 0 && hostname) {
r = link_set_hostname(link, "");
if (r < 0)
log_error_link(link, "Failed to reset transient hostname");
}
}
link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
return 0;
}
static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) {
sd_dhcp_lease *lease;
int r;
r = sd_dhcp_client_get_lease(client, &lease);
if (r < 0) {
log_warning_link(link, "DHCP error: no lease %s",
strerror(-r));
return r;
}
sd_dhcp_lease_unref(link->dhcp_lease);
link->dhcp_lease = lease;
link_enter_set_addresses(link);
return 0;
}
static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
sd_dhcp_lease *lease;
struct in_addr address;
struct in_addr netmask;
struct in_addr gateway;
unsigned prefixlen;
int r;
assert(client);
assert(link);
r = sd_dhcp_client_get_lease(client, &lease);
if (r < 0) {
log_warning_link(link, "DHCP error: no lease: %s",
strerror(-r));
return r;
}
r = sd_dhcp_lease_get_address(lease, &address);
if (r < 0) {
log_warning_link(link, "DHCP error: no address: %s",
strerror(-r));
return r;
}
r = sd_dhcp_lease_get_netmask(lease, &netmask);
if (r < 0) {
log_warning_link(link, "DHCP error: no netmask: %s",
strerror(-r));
return r;
}
prefixlen = net_netmask_to_prefixlen(&netmask);
r = sd_dhcp_lease_get_router(lease, &gateway);
if (r < 0 && r != -ENOENT) {
log_warning_link(link, "DHCP error: could not get gateway: %s",
strerror(-r));
return r;
}
if (r >= 0)
log_struct_link(LOG_INFO, link,
"MESSAGE=%-*s: DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
IFNAMSIZ,
link->ifname,
ADDRESS_FMT_VAL(address),
prefixlen,
ADDRESS_FMT_VAL(gateway),
"ADDRESS=%u.%u.%u.%u",
ADDRESS_FMT_VAL(address),
"PREFIXLEN=%u",
prefixlen,
"GATEWAY=%u.%u.%u.%u",
ADDRESS_FMT_VAL(gateway),
NULL);
else
log_struct_link(LOG_INFO, link,
"MESSAGE=%-*s: DHCPv4 address %u.%u.%u.%u/%u",
IFNAMSIZ,
link->ifname,
ADDRESS_FMT_VAL(address),
prefixlen,
"ADDRESS=%u.%u.%u.%u",
ADDRESS_FMT_VAL(address),
"PREFIXLEN=%u",
prefixlen,
NULL);
link->dhcp_lease = lease;
if (link->network->dhcp_mtu) {
uint16_t mtu;
r = sd_dhcp_lease_get_mtu(lease, &mtu);
if (r >= 0) {
r = link_set_mtu(link, mtu);
if (r < 0)
log_error_link(link, "Failed to set MTU "
"to %" PRIu16, mtu);
}
}
if (link->network->dhcp_hostname) {
const char *hostname;
r = sd_dhcp_lease_get_hostname(lease, &hostname);
if (r >= 0) {
r = link_set_hostname(link, hostname);
if (r < 0)
log_error_link(link, "Failed to set transient hostname "
"to '%s'", hostname);
}
}
link_enter_set_addresses(link);
return 0;
}
static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) {
Link *link = userdata;
int r = 0;
assert(link);
assert(link->network);
assert(link->manager);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
switch (event) {
case DHCP_EVENT_NO_LEASE:
log_debug_link(link, "IP address in use.");
break;
case DHCP_EVENT_EXPIRED:
case DHCP_EVENT_STOP:
case DHCP_EVENT_IP_CHANGE:
if (link->network->dhcp_critical) {
log_error_link(link, "DHCPv4 connection considered system critical, "
"ignoring request to reconfigure it.");
return;
}
if (link->dhcp_lease) {
r = dhcp_lease_lost(link);
if (r < 0) {
link_enter_failed(link);
return;
}
}
if (event == DHCP_EVENT_IP_CHANGE) {
r = dhcp_lease_acquired(client, link);
if (r < 0) {
link_enter_failed(link);
return;
}
}
if (event == DHCP_EVENT_EXPIRED && link->network->ipv4ll) {
if (!sd_ipv4ll_is_running(link->ipv4ll))
r = sd_ipv4ll_start(link->ipv4ll);
else if (ipv4ll_is_bound(link->ipv4ll))
r = ipv4ll_address_update(link, false);
if (r < 0) {
link_enter_failed(link);
return;
}
}
break;
case DHCP_EVENT_RENEW:
r = dhcp_lease_renew(client, link);
if (r < 0) {
link_enter_failed(link);
return;
}
break;
case DHCP_EVENT_IP_ACQUIRE:
r = dhcp_lease_acquired(client, link);
if (r < 0) {
link_enter_failed(link);
return;
}
if (link->ipv4ll) {
if (ipv4ll_is_bound(link->ipv4ll))
r = ipv4ll_address_update(link, true);
else
r = sd_ipv4ll_stop(link->ipv4ll);
if (r < 0) {
link_enter_failed(link);
return;
}
}
break;
default:
if (event < 0)
log_warning_link(link, "DHCP error: client failed: %s", strerror(-event));
else
log_warning_link(link, "DHCP unknown event: %d", event);
break;
}
return;
}
static int ipv4ll_address_update(Link *link, bool deprecate) {
int r;
struct in_addr addr;
assert(link);
r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
if (r >= 0) {
_cleanup_address_free_ Address *address = NULL;
log_debug_link(link, "IPv4 link-local %s %u.%u.%u.%u",
deprecate ? "deprecate" : "approve",
ADDRESS_FMT_VAL(addr));
r = address_new_dynamic(&address);
if (r < 0) {
log_error_link(link, "Could not allocate address: %s", strerror(-r));
return r;
}
address->family = AF_INET;
address->in_addr.in = addr;
address->prefixlen = 16;
address->scope = RT_SCOPE_LINK;
address->cinfo.ifa_prefered = deprecate ? 0 : CACHE_INFO_INFINITY_LIFE_TIME;
address->broadcast.s_addr = address->in_addr.in.s_addr | htonl(0xfffffffflu >> address->prefixlen);
address_update(address, link, &address_update_handler);
link_ref(link);
}
return 0;
}
static int ipv4ll_address_lost(Link *link) {
int r;
struct in_addr addr;
assert(link);
r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
if (r >= 0) {
_cleanup_address_free_ Address *address = NULL;
_cleanup_route_free_ Route *route = NULL;
log_debug_link(link, "IPv4 link-local release %u.%u.%u.%u",
ADDRESS_FMT_VAL(addr));
r = address_new_dynamic(&address);
if (r < 0) {
log_error_link(link, "Could not allocate address: %s", strerror(-r));
return r;
}
address->family = AF_INET;
address->in_addr.in = addr;
address->prefixlen = 16;
address->scope = RT_SCOPE_LINK;
address_drop(address, link, &address_drop_handler);
link_ref(link);
r = route_new_dynamic(&route);
if (r < 0) {
log_error_link(link, "Could not allocate route: %s",
strerror(-r));
return r;
}
route->family = AF_INET;
route->scope = RT_SCOPE_LINK;
route->metrics = 99;
route_drop(route, link, &route_drop_handler);
link_ref(link);
}
return 0;
}
static bool ipv4ll_is_bound(sd_ipv4ll *ll) {
int r;
struct in_addr addr;
assert(ll);
r = sd_ipv4ll_get_address(ll, &addr);
if (r < 0)
return false;
return true;
}
static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) {
struct in_addr address;
int r;
assert(ll);
assert(link);
r = sd_ipv4ll_get_address(ll, &address);
if (r < 0)
return r;
log_struct_link(LOG_INFO, link,
"MESSAGE=%-*s: IPv4 link-local address %u.%u.%u.%u",
IFNAMSIZ,
link->ifname,
ADDRESS_FMT_VAL(address),
NULL);
link_enter_set_addresses(link);
return 0;
}
static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata){
Link *link = userdata;
int r;
assert(link);
assert(link->network);
assert(link->manager);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
switch(event) {
case IPV4LL_EVENT_STOP:
case IPV4LL_EVENT_CONFLICT:
r = ipv4ll_address_lost(link);
if (r < 0) {
link_enter_failed(link);
return;
}
break;
case IPV4LL_EVENT_BIND:
r = ipv4ll_address_claimed(ll, link);
if (r < 0) {
link_enter_failed(link);
return;
}
break;
default:
if (event < 0)
log_warning_link(link, "IPv4 link-local error: %s", strerror(-event));
else
log_warning_link(link, "IPv4 link-local unknown event: %d", event);
break;
}
}
static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) {
Link *link = userdata;
assert(link);
assert(link->network);
assert(link->manager);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
switch(event) {
case DHCP6_EVENT_STOP:
case DHCP6_EVENT_RESEND_EXPIRE:
case DHCP6_EVENT_RETRANS_MAX:
case DHCP6_EVENT_IP_ACQUIRE:
log_debug_link(link, "DHCPv6 event %d", event);
break;
default:
if (event < 0)
log_warning_link(link, "DHCPv6 error: %s",
strerror(-event));
else
log_warning_link(link, "DHCPv6 unknown event: %d",
event);
return;
}
}
static void icmp6_router_handler(sd_icmp6_nd *nd, int event, void *userdata) {
Link *link = userdata;
int r;
assert(link);
assert(link->network);
assert(link->manager);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
switch(event) {
case ICMP6_EVENT_ROUTER_ADVERTISMENT_NONE:
case ICMP6_EVENT_ROUTER_ADVERTISMENT_OTHER:
return;
case ICMP6_EVENT_ROUTER_ADVERTISMENT_TIMEOUT:
case ICMP6_EVENT_ROUTER_ADVERTISMENT_MANAGED:
break;
default:
if (event < 0)
log_warning_link(link, "ICMPv6 error: %s",
strerror(-event));
else
log_warning_link(link, "ICMPv6 unknown event: %d",
event);
return;
}
if (link->dhcp6_client)
return;
r = sd_dhcp6_client_new(&link->dhcp6_client);
if (r < 0)
return;
r = sd_dhcp6_client_attach_event(link->dhcp6_client, NULL, 0);
if (r < 0) {
link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
return;
}
r = sd_dhcp6_client_set_mac(link->dhcp6_client, &link->mac);
if (r < 0) {
link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
return;
}
r = sd_dhcp6_client_set_index(link->dhcp6_client, link->ifindex);
if (r < 0) {
link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
return;
}
r = sd_dhcp6_client_set_callback(link->dhcp6_client, dhcp6_handler,
link);
if (r < 0) {
link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
return;
}
r = sd_dhcp6_client_start(link->dhcp6_client);
if (r < 0)
link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
}
static int link_acquire_conf(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->manager);
assert(link->manager->event);
if (link->network->ipv4ll) {
assert(link->ipv4ll);
log_debug_link(link, "acquiring IPv4 link-local address");
r = sd_ipv4ll_start(link->ipv4ll);
if (r < 0) {
log_warning_link(link, "could not acquire IPv4 "
"link-local address");
return r;
}
}
if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V4)) {
assert(link->dhcp_client);
log_debug_link(link, "acquiring DHCPv4 lease");
r = sd_dhcp_client_start(link->dhcp_client);
if (r < 0) {
log_warning_link(link, "could not acquire DHCPv4 "
"lease");
return r;
}
}
if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V6)) {
assert(link->icmp6_router_discovery);
log_debug_link(link, "discovering IPv6 routers");
r = sd_icmp6_router_solicitation_start(link->icmp6_router_discovery);
if (r < 0) {
log_warning_link(link, "could not start IPv6 router discovery");
return r;
}
}
return 0;
}
bool link_has_carrier(unsigned flags, uint8_t operstate) {
/* see Documentation/networking/operstates.txt in the kernel sources */
if (operstate == IF_OPER_UP)
return true;
if (operstate == IF_OPER_UNKNOWN)
/* operstate may not be implemented, so fall back to flags */
if ((flags & IFF_LOWER_UP) && !(flags & IFF_DORMANT))
return true;
return false;
}
#define FLAG_STRING(string, flag, old, new) \
(((old ^ new) & flag) \
? ((old & flag) ? (" -" string) : (" +" string)) \
: "")
static int link_update_flags(Link *link, sd_rtnl_message *m) {
unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
uint8_t operstate;
bool carrier_gained = false, carrier_lost = false;
int r;
assert(link);
r = sd_rtnl_message_link_get_flags(m, &flags);
if (r < 0) {
log_warning_link(link, "Could not get link flags");
return r;
}
r = sd_rtnl_message_read_u8(m, IFLA_OPERSTATE, &operstate);
if (r < 0)
/* if we got a message without operstate, take it to mean
the state was unchanged */
operstate = link->kernel_operstate;
if ((link->flags == flags) && (link->kernel_operstate == operstate))
return 0;
if (link->flags != flags) {
log_debug_link(link, "flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
FLAG_STRING("UP", IFF_UP, link->flags, flags),
FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
/* link flags are currently at most 18 bits, let's align to printing 20 */
if (unknown_flags_added)
log_debug_link(link, "unknown link flags gained: %#.5x (ignoring)",
unknown_flags_added);
if (unknown_flags_removed)
log_debug_link(link, "unknown link flags lost: %#.5x (ignoring)",
unknown_flags_removed);
}
carrier_gained = !link_has_carrier(link->flags, link->kernel_operstate) &&
link_has_carrier(flags, operstate);
carrier_lost = link_has_carrier(link->flags, link->kernel_operstate) &&
!link_has_carrier(flags, operstate);
link->flags = flags;
link->kernel_operstate = operstate;
link_save(link);
if (link->state == LINK_STATE_FAILED ||
link->state == LINK_STATE_UNMANAGED)
return 0;
if (carrier_gained) {
log_info_link(link, "gained carrier");
if (link->network) {
r = link_acquire_conf(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
} else if (carrier_lost) {
log_info_link(link, "lost carrier");
r = link_stop_clients(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
return 0;
}
static int link_up_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0) {
/* we warn but don't fail the link, as it may
be brought up later */
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not bring up interface: %s",
IFNAMSIZ,
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
}
return 1;
}
static int link_up(Link *link) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
log_debug_link(link, "bringing link up");
r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
RTM_SETLINK, link->ifindex);
if (r < 0) {
log_error_link(link, "Could not allocate RTM_SETLINK message");
return r;
}
r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
if (r < 0) {
log_error_link(link, "Could not set link flags: %s", strerror(-r));
return r;
}
r = sd_rtnl_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
if (r < 0) {
log_error_link(link,
"Could not send rtnetlink message: %s", strerror(-r));
return r;
}
link_ref(link);
return 0;
}
static int link_enslaved(Link *link) {
int r;
assert(link);
assert(link->state == LINK_STATE_ENSLAVING);
assert(link->network);
log_debug_link(link, "enslaved");
if (!(link->flags & IFF_UP)) {
r = link_up(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
return link_enter_set_addresses(link);
}
static int enslave_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(link);
assert(IN_SET(link->state, LINK_STATE_ENSLAVING, LINK_STATE_FAILED,
LINK_STATE_LINGER));
assert(link->network);
link->enslaving --;
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_struct_link(LOG_ERR, link,
"MESSAGE=%-*s: could not enslave: %s",
IFNAMSIZ,
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
link_enter_failed(link);
return 1;
}
if (link->enslaving <= 0)
link_enslaved(link);
return 1;
}
static int link_enter_enslave(Link *link) {
NetDev *vlan, *macvlan, *vxlan;
Iterator i;
int r;
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_INITIALIZING);
link->state = LINK_STATE_ENSLAVING;
link_save(link);
if (!link->network->bridge &&
!link->network->bond &&
!link->network->tunnel &&
hashmap_isempty(link->network->vlans) &&
hashmap_isempty(link->network->macvlans) &&
hashmap_isempty(link->network->vxlans))
return link_enslaved(link);
if (link->network->bond) {
log_struct_link(LOG_DEBUG, link,
"MESSAGE=%-*s: enslaving by '%s'",
IFNAMSIZ,
link->ifname, link->network->bond->ifname,
NETDEV(link->network->bond),
NULL);
r = netdev_enslave(link->network->bond, link, &enslave_handler);
if (r < 0) {
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not enslave by '%s': %s",
IFNAMSIZ,
link->ifname, link->network->bond->ifname, strerror(-r),
NETDEV(link->network->bond),
NULL);
link_enter_failed(link);
return r;
}
link_ref(link);
link->enslaving ++;
}
if (link->network->bridge) {
log_struct_link(LOG_DEBUG, link,
"MESSAGE=%-*s: enslaving by '%s'",
IFNAMSIZ,
link->ifname, link->network->bridge->ifname,
NETDEV(link->network->bridge),
NULL);
r = netdev_enslave(link->network->bridge, link, &enslave_handler);
if (r < 0) {
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not enslave by '%s': %s",
IFNAMSIZ,
link->ifname, link->network->bridge->ifname, strerror(-r),
NETDEV(link->network->bridge),
NULL);
link_enter_failed(link);
return r;
}
link_ref(link);
link->enslaving ++;
}
if (link->network->tunnel) {
log_struct_link(LOG_DEBUG, link,
"MESSAGE=%-*s: enslaving by '%s'",
IFNAMSIZ,
link->ifname, link->network->tunnel->ifname,
NETDEV(link->network->tunnel),
NULL);
r = netdev_enslave(link->network->tunnel, link, &enslave_handler);
if (r < 0) {
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not enslave by '%s': %s",
IFNAMSIZ,
link->ifname, link->network->tunnel->ifname, strerror(-r),
NETDEV(link->network->tunnel),
NULL);
link_enter_failed(link);
return r;
}
link_ref(link);
link->enslaving ++;
}
HASHMAP_FOREACH(vlan, link->network->vlans, i) {
log_struct_link(LOG_DEBUG, link,
"MESSAGE=%-*s: enslaving by '%s'",
IFNAMSIZ,
link->ifname, vlan->ifname, NETDEV(vlan), NULL);
r = netdev_enslave(vlan, link, &enslave_handler);
if (r < 0) {
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not enslave by '%s': %s",
IFNAMSIZ,
link->ifname, vlan->ifname, strerror(-r),
NETDEV(vlan), NULL);
link_enter_failed(link);
return r;
}
link_ref(link);
link->enslaving ++;
}
HASHMAP_FOREACH(macvlan, link->network->macvlans, i) {
log_struct_link(LOG_DEBUG, link,
"MESSAGE=%-*s: enslaving by '%s'",
IFNAMSIZ,
link->ifname, macvlan->ifname, NETDEV(macvlan), NULL);
r = netdev_enslave(macvlan, link, &enslave_handler);
if (r < 0) {
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not enslave by '%s': %s",
IFNAMSIZ,
link->ifname, macvlan->ifname, strerror(-r),
NETDEV(macvlan), NULL);
link_enter_failed(link);
return r;
}
link_ref(link);
link->enslaving ++;
}
HASHMAP_FOREACH(vxlan, link->network->vxlans, i) {
log_struct_link(LOG_DEBUG, link,
"MESSAGE=%*s: enslaving by '%s'",
IFNAMSIZ,
link->ifname, vxlan->ifname, NETDEV(vxlan), NULL);
r = netdev_enslave(vxlan, link, &enslave_handler);
if (r < 0) {
log_struct_link(LOG_WARNING, link,
"MESSAGE=%*s: could not enslave by '%s': %s",
IFNAMSIZ,
link->ifname, vxlan->ifname, strerror(-r),
NETDEV(vxlan), NULL);
link_enter_failed(link);
return r;
}
link_ref(link);
link->enslaving ++;
}
return 0;
}
static int link_configure(Link *link) {
int r;
assert(link);
assert(link->state == LINK_STATE_INITIALIZING);
if (link->network->ipv4ll) {
uint8_t seed[8];
r = sd_ipv4ll_new(&link->ipv4ll);
if (r < 0)
return r;
if (link->udev_device) {
r = net_get_unique_predictable_data(link->udev_device, seed);
if (r >= 0) {
r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed);
if (r < 0)
return r;
}
}
r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
if (r < 0)
return r;
r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
if (r < 0)
return r;
r = sd_ipv4ll_set_index(link->ipv4ll, link->ifindex);
if (r < 0)
return r;
r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link);
if (r < 0)
return r;
}
if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V4)) {
r = sd_dhcp_client_new(&link->dhcp_client);
if (r < 0)
return r;
r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
if (r < 0)
return r;
r = sd_dhcp_client_set_mac(link->dhcp_client, &link->mac);
if (r < 0)
return r;
r = sd_dhcp_client_set_index(link->dhcp_client, link->ifindex);
if (r < 0)
return r;
r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp_handler, link);
if (r < 0)
return r;
if (link->network->dhcp_mtu) {
r = sd_dhcp_client_set_request_option(link->dhcp_client, 26);
if (r < 0)
return r;
}
if (link->network->dhcp_routes) {
r = sd_dhcp_client_set_request_option(link->dhcp_client, DHCP_OPTION_STATIC_ROUTE);
if (r < 0)
return r;
r = sd_dhcp_client_set_request_option(link->dhcp_client, DHCP_OPTION_CLASSLESS_STATIC_ROUTE);
if (r < 0)
return r;
}
if (link->network->dhcp_sendhost) {
_cleanup_free_ char *hostname = gethostname_malloc();
if (!hostname)
return -ENOMEM;
if (!is_localhost(hostname)) {
r = sd_dhcp_client_set_hostname(link->dhcp_client, hostname);
if (r < 0)
return r;
}
}
}
if (link->network->dhcp_server) {
r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
if (r < 0)
return r;
r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
if (r < 0)
return r;
}
if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V6)) {
r = sd_icmp6_nd_new(&link->icmp6_router_discovery);
if (r < 0)
return r;
r = sd_icmp6_nd_attach_event(link->icmp6_router_discovery,
NULL, 0);
if (r < 0)
return r;
r = sd_icmp6_nd_set_mac(link->icmp6_router_discovery,
&link->mac);
if (r < 0)
return r;
r = sd_icmp6_nd_set_index(link->icmp6_router_discovery,
link->ifindex);
if (r < 0)
return r;
r = sd_icmp6_nd_set_callback(link->icmp6_router_discovery,
icmp6_router_handler, link);
if (r < 0)
return r;
}
if (link_has_carrier(link->flags, link->kernel_operstate)) {
r = link_acquire_conf(link);
if (r < 0)
return r;
}
return link_enter_enslave(link);
}
static int link_initialized_and_synced(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
Network *network;
int r;
assert(link);
assert(link->ifname);
assert(link->manager);
if (link->state != LINK_STATE_INITIALIZING)
return 1;
log_debug_link(link, "link state is up-to-date");
r = network_get(link->manager, link->udev_device, link->ifname, &link->mac, &network);
if (r == -ENOENT) {
link_enter_unmanaged(link);
return 1;
} else if (r < 0)
return r;
r = network_apply(link->manager, network, link);
if (r < 0)
return r;
r = link_configure(link);
if (r < 0)
return r;
return 1;
}
int link_initialized(Link *link, struct udev_device *device) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
assert(device);
if (link->state != LINK_STATE_INITIALIZING)
return 0;
log_debug_link(link, "udev initialized link");
link->udev_device = udev_device_ref(device);
/* udev has initialized the link, but we don't know if we have yet processed
the NEWLINK messages with the latest state. Do a GETLINK, when it returns
we know that the pending NEWLINKs have already been processed and that we
are up-to-date */
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
if (r < 0)
return r;
r = sd_rtnl_call_async(link->manager->rtnl, req, link_initialized_and_synced, link, 0, NULL);
if (r < 0)
return r;
link_ref(link);
return 0;
}
int link_rtnl_process_address(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) {
Manager *m = userdata;
Link *link = NULL;
uint16_t type;
_cleanup_address_free_ Address *address = NULL;
Address *ad;
char buf[INET6_ADDRSTRLEN];
bool address_dropped = false;
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_addr_get_ifindex(message, &ifindex);
if (r < 0 || ifindex <= 0) {
log_warning("rtnl: received address message without valid ifindex, ignoring");
return 0;
} else {
r = link_get(m, ifindex, &link);
if (r < 0 || !link) {
log_warning("rtnl: received address for a nonexistent link, ignoring");
return 0;
}
}
r = address_new_dynamic(&address);
if (r < 0)
return 0;
r = sd_rtnl_message_addr_get_family(message, &address->family);
if (r < 0 || !IN_SET(address->family, AF_INET, AF_INET6)) {
log_warning_link(link, "rtnl: received address with invalid family, ignoring");
return 0;
}
r = sd_rtnl_message_addr_get_prefixlen(message, &address->prefixlen);
if (r < 0) {
log_warning_link(link, "rtnl: received address with invalid prefixlen, ignoring");
return 0;
}
r = sd_rtnl_message_addr_get_scope(message, &address->scope);
if (r < 0) {
log_warning_link(link, "rtnl: received address with invalid scope, ignoring");
return 0;
}
switch (address->family) {
case AF_INET:
r = sd_rtnl_message_read_in_addr(message, IFA_LOCAL, &address->in_addr.in);
if (r < 0) {
log_warning_link(link, "rtnl: received address without valid address, ignoring");
return 0;
}
break;
case AF_INET6:
r = sd_rtnl_message_read_in6_addr(message, IFA_ADDRESS, &address->in_addr.in6);
if (r < 0) {
log_warning_link(link, "rtnl: received address without valid address, ignoring");
return 0;
}
break;
default:
assert_not_reached("invalid address family");
}
if (!inet_ntop(address->family, &address->in_addr, buf, INET6_ADDRSTRLEN)) {
log_warning_link(link, "could not print address");
return 0;
}
LIST_FOREACH(addresses, ad, link->addresses) {
if (address_equal(ad, address)) {
LIST_REMOVE(addresses, link->addresses, ad);
address_free(ad);
address_dropped = true;
break;
}
}
switch (type) {
case RTM_NEWADDR:
if (!address_dropped)
log_debug_link(link, "added address: %s/%u", buf,
address->prefixlen);
LIST_PREPEND(addresses, link->addresses, address);
address = NULL;
link_save(link);
break;
case RTM_DELADDR:
if (address_dropped) {
log_debug_link(link, "removed address: %s/%u", buf,
address->prefixlen);
link_save(link);
}
break;
default:
assert_not_reached("Received invalid RTNL message type");
}
return 1;
}
static int link_get_address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(rtnl);
assert(m);
assert(link);
assert(link->manager);
for (; m; m = sd_rtnl_message_next(m)) {
r = sd_rtnl_message_get_errno(m);
if (r < 0) {
log_debug_link(link, "getting address failed: %s", strerror(-r));
continue;
}
r = link_rtnl_process_address(rtnl, m, link->manager);
if (r < 0)
log_warning_link(link, "could not process address: %s", strerror(-r));
}
return 1;
}
int link_add(Manager *m, sd_rtnl_message *message, Link **ret) {
Link *link;
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
_cleanup_udev_device_unref_ struct udev_device *device = NULL;
char ifindex_str[2 + DECIMAL_STR_MAX(int)];
int r;
assert(m);
assert(m->rtnl);
assert(message);
assert(ret);
r = link_new(m, message, ret);
if (r < 0)
return r;
link = *ret;
log_debug_link(link, "link %"PRIu64" added", link->ifindex);
r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, link->ifindex, 0);
if (r < 0)
return r;
r = sd_rtnl_call_async(m->rtnl, req, link_get_address_handler, link, 0, NULL);
if (r < 0)
return r;
link_ref(link);
if (detect_container(NULL) <= 0) {
/* not in a container, udev will be around */
sprintf(ifindex_str, "n%"PRIu64, link->ifindex);
device = udev_device_new_from_device_id(m->udev, ifindex_str);
if (!device) {
log_warning_link(link, "could not find udev device");
return -errno;
}
if (udev_device_get_is_initialized(device) <= 0) {
/* not yet ready */
log_debug_link(link, "udev initializing link...");
return 0;
}
r = link_initialized(link, device);
if (r < 0)
return r;
} else {
/* we are calling a callback directly, so must take a ref */
link_ref(link);
r = link_initialized_and_synced(m->rtnl, NULL, link);
if (r < 0)
return r;
}
return 0;
}
int link_update(Link *link, sd_rtnl_message *m) {
struct ether_addr mac;
char *ifname;
int r;
assert(link);
assert(link->ifname);
assert(m);
if (link->state == LINK_STATE_LINGER) {
link_ref(link);
log_info_link(link, "link readded");
link->state = LINK_STATE_ENSLAVING;
}
r = sd_rtnl_message_read_string(m, IFLA_IFNAME, &ifname);
if (r >= 0 && !streq(ifname, link->ifname)) {
log_info_link(link, "renamed to %s", ifname);
free(link->ifname);
link->ifname = strdup(ifname);
if (!link->ifname)
return -ENOMEM;
}
if (!link->original_mtu) {
r = sd_rtnl_message_read_u16(m, IFLA_MTU, &link->original_mtu);
if (r >= 0)
log_debug_link(link, "saved original MTU: %"
PRIu16, link->original_mtu);
}
/* The kernel may broadcast NEWLINK messages without the MAC address
set, simply ignore them. */
r = sd_rtnl_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
if (r >= 0) {
if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN)) {
memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN);
log_debug_link(link, "MAC address: "
"%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
mac.ether_addr_octet[0],
mac.ether_addr_octet[1],
mac.ether_addr_octet[2],
mac.ether_addr_octet[3],
mac.ether_addr_octet[4],
mac.ether_addr_octet[5]);
if (link->ipv4ll) {
r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
if (r < 0) {
log_warning_link(link, "Could not update MAC "
"address in IPv4LL client: %s",
strerror(-r));
return r;
}
}
if (link->dhcp_client) {
r = sd_dhcp_client_set_mac(link->dhcp_client, &link->mac);
if (r < 0) {
log_warning_link(link, "Could not update MAC "
"address in DHCP client: %s",
strerror(-r));
return r;
}
}
if (link->dhcp6_client) {
r = sd_dhcp6_client_set_mac(link->dhcp6_client,
&link->mac);
if (r < 0) {
log_warning_link(link, "Could not update MAC address in DHCPv6 client: %s",
strerror(-r));
return r;
}
}
}
}
return link_update_flags(link, m);
}
static void serialize_addresses(FILE *f, const char *key, Address *address) {
Address *ad;
assert(f);
assert(key);
if (!address)
return;
fprintf(f, "%s=", key);
LIST_FOREACH(addresses, ad, address) {
char buf[INET6_ADDRSTRLEN];
if (inet_ntop(ad->family, &ad->in_addr, buf, INET6_ADDRSTRLEN))
fprintf(f, "%s%s", buf, (ad->addresses_next) ? " ": "");
}
fputs("\n", f);
}
static void link_update_operstate(Link *link) {
assert(link);
if (link->kernel_operstate == IF_OPER_DORMANT)
link->operstate = LINK_OPERSTATE_DORMANT;
else if (link_has_carrier(link->flags, link->kernel_operstate)) {
Address *address;
uint8_t scope = RT_SCOPE_NOWHERE;
/* if we have carrier, check what addresses we have */
LIST_FOREACH(addresses, address, link->addresses) {
if (address->scope < scope)
scope = address->scope;
}
if (scope < RT_SCOPE_SITE)
/* universally accessible addresses found */
link->operstate = LINK_OPERSTATE_ROUTABLE;
else if (scope < RT_SCOPE_HOST)
/* only link or site local addresses found */
link->operstate = LINK_OPERSTATE_DEGRADED;
else
/* no useful addresses found */
link->operstate = LINK_OPERSTATE_CARRIER;
} else
link->operstate = LINK_OPERSTATE_UNKNOWN;
}
int link_save(Link *link) {
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *admin_state, *oper_state;
int r;
assert(link);
assert(link->state_file);
assert(link->lease_file);
assert(link->manager);
link_update_operstate(link);
r = manager_save(link->manager);
if (r < 0)
return r;
if (link->state == LINK_STATE_LINGER) {
unlink(link->state_file);
return 0;
}
admin_state = link_state_to_string(link->state);
assert(admin_state);
oper_state = link_operstate_to_string(link->operstate);
assert(oper_state);
r = fopen_temporary(link->state_file, &f, &temp_path);
if (r < 0)
goto finish;
fchmod(fileno(f), 0644);
fprintf(f,
"# This is private data. Do not parse.\n"
"ADMIN_STATE=%s\n"
"OPER_STATE=%s\n"
"FLAGS=%u\n",
admin_state, oper_state, link->flags);
if (link->network) {
serialize_addresses(f, "DNS", link->network->dns);
serialize_addresses(f, "NTP", link->network->ntp);
}
if (link->dhcp_lease) {
assert(link->network);
r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
if (r < 0)
goto finish;
fprintf(f,
"DHCP_LEASE=%s\n"
"DHCP_USE_DNS=%s\n"
"DHCP_USE_NTP=%s\n",
link->lease_file,
yes_no(link->network->dhcp_dns),
yes_no(link->network->dhcp_ntp));
} else
unlink(link->lease_file);
fflush(f);
if (ferror(f) || rename(temp_path, link->state_file) < 0) {
r = -errno;
unlink(link->state_file);
unlink(temp_path);
}
finish:
if (r < 0)
log_error_link(link, "Failed to save link data to %s: %s", link->state_file, strerror(-r));
return r;
}
static const char* const link_state_table[_LINK_STATE_MAX] = {
[LINK_STATE_INITIALIZING] = "initializing",
[LINK_STATE_ENSLAVING] = "configuring",
[LINK_STATE_SETTING_ADDRESSES] = "configuring",
[LINK_STATE_SETTING_ROUTES] = "configuring",
[LINK_STATE_CONFIGURED] = "configured",
[LINK_STATE_UNMANAGED] = "unmanaged",
[LINK_STATE_FAILED] = "failed",
[LINK_STATE_LINGER] = "linger",
};
DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
[LINK_OPERSTATE_UNKNOWN] = "unknown",
[LINK_OPERSTATE_DORMANT] = "dormant",
[LINK_OPERSTATE_CARRIER] = "carrier",
[LINK_OPERSTATE_DEGRADED] = "degraded",
[LINK_OPERSTATE_ROUTABLE] = "routable",
};
DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
static const char* const dhcp_support_table[_DHCP_SUPPORT_MAX] = {
[DHCP_SUPPORT_NONE] = "none",
[DHCP_SUPPORT_BOTH] = "both",
[DHCP_SUPPORT_V4] = "v4",
[DHCP_SUPPORT_V6] = "v6",
};
DEFINE_STRING_TABLE_LOOKUP(dhcp_support, DHCPSupport);
int config_parse_dhcp(
const char* unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
DHCPSupport *dhcp = data;
int k;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
/* Our enum shall be a superset of booleans, hence first try
* to parse as boolean, and then as enum */
k = parse_boolean(rvalue);
if (k > 0)
*dhcp = DHCP_SUPPORT_BOTH;
else if (k == 0)
*dhcp = DHCP_SUPPORT_NONE;
else {
DHCPSupport s;
s = dhcp_support_from_string(rvalue);
if (s < 0){
log_syntax(unit, LOG_ERR, filename, line, -s, "Failed to parse DHCP option, ignoring: %s", rvalue);
return 0;
}
*dhcp = s;
}
return 0;
}