+/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2013-2014 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 "alloc-util.h"
#include "dhcp-lease-internal.h"
#include "hostname-util.h"
+#include "parse-util.h"
+#include "netdev/vrf.h"
#include "network-internal.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "networkd-network.h"
+#include "string-util.h"
+#include "sysctl-util.h"
static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m,
void *userdata) {
- _cleanup_link_unref_ Link *link = userdata;
+ _cleanup_(link_unrefp) Link *link = userdata;
int r;
assert(link);
}
static int link_set_dhcp_routes(Link *link) {
- struct in_addr gateway, address;
_cleanup_free_ sd_dhcp_route **static_routes = NULL;
+ bool classless_route = false, static_route = false;
+ struct in_addr gateway, address;
int r, n, i;
+ uint32_t table;
assert(link);
if (!link->network->dhcp_use_routes)
return 0;
+ /* When the interface is part of an VRF use the VRFs routing table, unless
+ * there is a another table specified. */
+ table = link->network->dhcp_route_table;
+ if (!link->network->dhcp_route_table_set && link->network->vrf != NULL)
+ table = VRF(link->network->vrf)->table;
+
r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");
+ n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
+ if (n < 0)
+ log_link_debug_errno(link, n, "DHCP error: could not get routes: %m");
+
+ for (i = 0; i < n; i++) {
+ if (static_routes[i]->option == SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE)
+ classless_route = true;
+
+ if (static_routes[i]->option == SD_DHCP_OPTION_STATIC_ROUTE)
+ static_route = true;
+ }
+
+ for (i = 0; i < n; i++) {
+ _cleanup_(route_freep) Route *route = NULL;
+
+ /* if the DHCP server returns both a Classless Static Routes option and a Static Routes option,
+ the DHCP client MUST ignore the Static Routes option. */
+ if (classless_route && static_routes[i]->option == SD_DHCP_OPTION_STATIC_ROUTE)
+ continue;
+
+ r = route_new(&route);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not allocate route: %m");
+
+ route->family = AF_INET;
+ route->protocol = RTPROT_DHCP;
+ assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0);
+ assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0);
+ assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0);
+ route->priority = link->network->dhcp_route_metric;
+ route->table = table;
+ route->scope = route_scope_from_address(route, &address);
+
+ r = route_configure(route, link, dhcp4_route_handler);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Could not set host route: %m");
+
+ link->dhcp4_messages++;
+ }
+
r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
- if (r < 0 && r != -ENODATA)
- return log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m");
+ if (r == -ENODATA)
+ log_link_info_errno(link, r, "DHCP: No routes received from DHCP server: %m");
+ else if (r < 0)
+ log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m");
- if (r >= 0) {
- _cleanup_route_free_ Route *route = NULL;
- _cleanup_route_free_ Route *route_gw = NULL;
+ /* According to RFC 3442: If the DHCP server returns both a Classless Static Routes option and
+ a Router option, the DHCP client MUST ignore the Router option. */
+ if (classless_route && static_route)
+ log_link_warning(link, "Classless static routes received from DHCP server: ignoring static-route option and router option");
+
+ if (r >= 0 && !classless_route) {
+ _cleanup_(route_freep) Route *route = NULL;
+ _cleanup_(route_freep) Route *route_gw = NULL;
r = route_new(&route);
if (r < 0)
route_gw->scope = RT_SCOPE_LINK;
route_gw->protocol = RTPROT_DHCP;
route_gw->priority = link->network->dhcp_route_metric;
- route_gw->table = link->network->dhcp_route_table;
+ route_gw->table = table;
r = route_configure(route_gw, link, dhcp4_route_handler);
if (r < 0)
route->gw.in = gateway;
route->prefsrc.in = address;
route->priority = link->network->dhcp_route_metric;
- route->table = link->network->dhcp_route_table;
+ route->table = table;
r = route_configure(route, link, dhcp4_route_handler);
if (r < 0) {
link->dhcp4_messages++;
}
- n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
- if (n == -ENODATA)
- return 0;
- if (n < 0)
- return log_link_warning_errno(link, n, "DHCP error: could not get routes: %m");
-
- for (i = 0; i < n; i++) {
- _cleanup_route_free_ Route *route = NULL;
-
- r = route_new(&route);
- if (r < 0)
- return log_link_error_errno(link, r, "Could not allocate route: %m");
-
- route->family = AF_INET;
- route->protocol = RTPROT_DHCP;
- assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0);
- assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0);
- assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0);
- route->priority = link->network->dhcp_route_metric;
- route->table = link->network->dhcp_route_table;
- route->scope = route_scope_from_address(route, &address);
-
- r = route_configure(route, link, dhcp4_route_handler);
- if (r < 0)
- return log_link_warning_errno(link, r, "Could not set host route: %m");
-
- link->dhcp4_messages++;
- }
-
return 0;
}
static int dhcp_lease_lost(Link *link) {
- _cleanup_address_free_ Address *address = NULL;
+ _cleanup_(address_freep) Address *address = NULL;
struct in_addr addr;
struct in_addr netmask;
struct in_addr gateway;
n = sd_dhcp_lease_get_routes(link->dhcp_lease, &routes);
if (n >= 0) {
for (i = 0; i < n; i++) {
- _cleanup_route_free_ Route *route = NULL;
+ _cleanup_(route_freep) Route *route = NULL;
r = route_new(&route);
if (r >= 0) {
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;
+ _cleanup_(route_freep) Route *route_gw = NULL;
+ _cleanup_(route_freep) Route *route = NULL;
r = route_new(&route_gw);
if (r >= 0) {
if (r >= 0) {
r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
if (r >= 0)
- prefixlen = in_addr_netmask_to_prefixlen(&netmask);
+ prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
address->family = AF_INET;
address->in_addr.in = addr;
static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m,
void *userdata) {
- _cleanup_link_unref_ Link *link = userdata;
+ _cleanup_(link_unrefp) Link *link = userdata;
int r;
assert(link);
link_set_dhcp_routes(link);
+ if (link->dhcp4_messages == 0) {
+ link->dhcp4_configured = true;
+ link_check_ready(link);
+ }
+
return 1;
}
struct in_addr *address,
struct in_addr *netmask,
uint32_t lifetime) {
- _cleanup_address_free_ Address *addr = NULL;
+ _cleanup_(address_freep) Address *addr = NULL;
unsigned prefixlen;
int r;
assert(netmask);
assert(lifetime);
- prefixlen = in_addr_netmask_to_prefixlen(netmask);
+ prefixlen = in4_addr_netmask_to_prefixlen(netmask);
r = address_new(&addr);
if (r < 0)
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: No netmask: %m");
- prefixlen = in_addr_netmask_to_prefixlen(&netmask);
+ prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
r = sd_dhcp_lease_get_router(lease, &gateway);
if (r < 0 && r != -ENODATA)
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);
+ "GATEWAY=%u.%u.%u.%u", ADDRESS_FMT_VAL(gateway));
else
log_struct(LOG_INFO,
LOG_LINK_INTERFACE(link),
ADDRESS_FMT_VAL(address),
prefixlen),
"ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
- "PREFIXLEN=%u", prefixlen,
- NULL);
+ "PREFIXLEN=%u", prefixlen);
link->dhcp_lease = sd_dhcp_lease_ref(lease);
link_dirty(link);
}
if (link->network->dhcp_use_hostname) {
- const char *hostname = NULL;
+ const char *dhcpname = NULL;
+ _cleanup_free_ char *hostname = NULL;
if (link->network->dhcp_hostname)
- hostname = link->network->dhcp_hostname;
+ dhcpname = link->network->dhcp_hostname;
else
- (void) sd_dhcp_lease_get_hostname(lease, &hostname);
+ (void) sd_dhcp_lease_get_hostname(lease, &dhcpname);
+
+ if (dhcpname) {
+ r = shorten_overlong(dhcpname, &hostname);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Unable to shorten overlong DHCP hostname '%s', ignoring: %m", dhcpname);
+ if (r == 1)
+ log_link_notice(link, "Overlong DCHP hostname received, shortened from '%s' to '%s'", dhcpname, hostname);
+ }
if (hostname) {
r = manager_set_hostname(link->manager, hostname);
return sd_dhcp_client_set_hostname(link->dhcp_client, hn);
}
+static bool promote_secondaries_enabled(const char *ifname) {
+ _cleanup_free_ char *promote_secondaries_sysctl = NULL;
+ char *promote_secondaries_path;
+ int r;
+
+ promote_secondaries_path = strjoina("net/ipv4/conf/", ifname, "/promote_secondaries");
+ r = sysctl_read(promote_secondaries_path, &promote_secondaries_sysctl);
+ if (r < 0) {
+ log_debug_errno(r, "Cannot read sysctl %s", promote_secondaries_path);
+ return false;
+ }
+
+ truncate_nl(promote_secondaries_sysctl);
+ r = parse_boolean(promote_secondaries_sysctl);
+ if (r < 0)
+ log_warning_errno(r, "Cannot parse sysctl %s with content %s as boolean", promote_secondaries_path, promote_secondaries_sysctl);
+ return r > 0;
+}
+
+/* dhcp4_set_promote_secondaries will ensure this interface has
+ * the "promote_secondaries" option in the kernel set. If this sysctl
+ * is not set DHCP will work only as long as the IP address does not
+ * changes between leases. The kernel will remove all secondary IP
+ * addresses of an interface otherwise. The way systemd-network works
+ * is that the new IP of a lease is added as a secondary IP and when
+ * the primary one expires it relies on the kernel to promote the
+ * secondary IP. See also https://github.com/systemd/systemd/issues/7163
+ */
+int dhcp4_set_promote_secondaries(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
+
+ /* check if the kernel has promote_secondaries enabled for our
+ * interface. If it is not globally enabled or enabled for the
+ * specific interface we must either enable it.
+ */
+ if (!(promote_secondaries_enabled("all") || promote_secondaries_enabled(link->ifname))) {
+ char *promote_secondaries_path = NULL;
+
+ log_link_debug(link, "promote_secondaries is unset, setting it");
+ promote_secondaries_path = strjoina("net/ipv4/conf/", link->ifname, "/promote_secondaries");
+ r = sysctl_write(promote_secondaries_path, "1");
+ if (r < 0)
+ log_link_warning_errno(link, r, "cannot set sysctl %s to 1", promote_secondaries_path);
+ return r > 0;
+ }
+
+ return 0;
+}
+
int dhcp4_configure(Link *link) {
int r;
assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
if (!link->dhcp_client) {
- r = sd_dhcp_client_new(&link->dhcp_client);
+ r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize);
if (r < 0)
return r;
}
return r;
}
- if (link->network->dhcp_use_routes) {
+ /* NOTE: even if this variable is called "use", it also "sends" PRL
+ * options, maybe there should be a different configuration variable
+ * to send or not route options?. */
+ /* NOTE: when using Anonymize=yes, routes PRL options are sent
+ * by default, so they don't need to be added here. */
+ if (link->network->dhcp_use_routes && !link->network->dhcp_anonymize) {
r = sd_dhcp_client_set_request_option(link->dhcp_client,
SD_DHCP_OPTION_STATIC_ROUTE);
if (r < 0)
return r;
}
- /* Always acquire the timezone and NTP */
- r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NTP_SERVER);
- if (r < 0)
- return r;
+ if (link->network->dhcp_use_ntp) {
+ r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NTP_SERVER);
+ if (r < 0)
+ return r;
+ }
- r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NEW_TZDB_TIMEZONE);
- if (r < 0)
- return r;
+ if (link->network->dhcp_use_timezone) {
+ r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NEW_TZDB_TIMEZONE);
+ if (r < 0)
+ return r;
+ }
r = dhcp4_set_hostname(link);
if (r < 0)
return r;
}
+ if (link->network->dhcp_user_class) {
+ r = sd_dhcp_client_set_user_class(link->dhcp_client, (const char **) link->network->dhcp_user_class);
+ if (r < 0)
+ return r;
+ }
+
if (link->network->dhcp_client_port) {
r = sd_dhcp_client_set_client_port(link->dhcp_client, link->network->dhcp_client_port);
if (r < 0)
return r;
break;
}
+ case DHCP_CLIENT_ID_DUID_ONLY: {
+ /* If configured, apply user specified DUID */
+ const DUID *duid = link_duid(link);
+
+ r = sd_dhcp_client_set_duid(link->dhcp_client,
+ duid->type,
+ duid->raw_data_len > 0 ? duid->raw_data : NULL,
+ duid->raw_data_len);
+ if (r < 0)
+ return r;
+ break;
+ }
case DHCP_CLIENT_ID_MAC:
r = sd_dhcp_client_set_client_id(link->dhcp_client,
ARPHRD_ETHER,
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