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Diffstat (limited to 'src/grp-network/libnetworkd-core/networkd-dhcp4.c')
-rw-r--r--src/grp-network/libnetworkd-core/networkd-dhcp4.c662
1 files changed, 662 insertions, 0 deletions
diff --git a/src/grp-network/libnetworkd-core/networkd-dhcp4.c b/src/grp-network/libnetworkd-core/networkd-dhcp4.c
new file mode 100644
index 0000000000..34b423f0b5
--- /dev/null
+++ b/src/grp-network/libnetworkd-core/networkd-dhcp4.c
@@ -0,0 +1,662 @@
+/***
+ 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 <linux/if.h>
+
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/hostname-util.h"
+#include "systemd-network/dhcp-lease-internal.h"
+#include "systemd-network/network-internal.h"
+
+#include "networkd.h"
+
+static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m,
+ void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(link);
+ assert(link->dhcp4_messages > 0);
+
+ link->dhcp4_messages--;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EEXIST) {
+ log_link_error_errno(link, r, "Could not set DHCPv4 route: %m");
+ link_enter_failed(link);
+ }
+
+ if (link->dhcp4_messages == 0) {
+ link->dhcp4_configured = true;
+ link_check_ready(link);
+ }
+
+ return 1;
+}
+
+static int link_set_dhcp_routes(Link *link) {
+ struct in_addr gateway;
+ _cleanup_free_ sd_dhcp_route **static_routes = NULL;
+ int r, n, i;
+
+ assert(link);
+ assert(link->dhcp_lease);
+ assert(link->network);
+
+ if (!link->network->dhcp_use_routes)
+ return 0;
+
+ 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 >= 0) {
+ struct in_addr address;
+ _cleanup_route_free_ Route *route = NULL;
+ _cleanup_route_free_ Route *route_gw = NULL;
+
+ 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");
+
+ r = route_new(&route);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not allocate route: %m");
+
+ route->protocol = RTPROT_DHCP;
+
+ r = route_new(&route_gw);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not allocate route: %m");
+
+ /* 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.in = gateway;
+ route_gw->dst_prefixlen = 32;
+ route_gw->prefsrc.in = address;
+ 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;
+
+ r = route_configure(route_gw, link, dhcp4_route_handler);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Could not set host route: %m");
+
+ link->dhcp4_messages++;
+
+ route->family = AF_INET;
+ route->gw.in = gateway;
+ route->prefsrc.in = address;
+ route->priority = link->network->dhcp_route_metric;
+ route->table = link->network->dhcp_route_table;
+
+ r = route_configure(route, link, dhcp4_route_handler);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "Could not set routes: %m");
+ link_enter_failed(link);
+ return r;
+ }
+
+ 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;
+
+ 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;
+ struct in_addr addr;
+ struct in_addr netmask;
+ struct in_addr gateway;
+ unsigned prefixlen = 0;
+ int r;
+
+ assert(link);
+ assert(link->dhcp_lease);
+
+ log_link_warning(link, "DHCP lease lost");
+
+ if (link->network->dhcp_use_routes) {
+ _cleanup_free_ sd_dhcp_route **routes = NULL;
+ int n, i;
+
+ 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;
+
+ r = route_new(&route);
+ if (r >= 0) {
+ route->family = AF_INET;
+ assert_se(sd_dhcp_route_get_gateway(routes[i], &route->gw.in) >= 0);
+ assert_se(sd_dhcp_route_get_destination(routes[i], &route->dst.in) >= 0);
+ assert_se(sd_dhcp_route_get_destination_prefix_length(routes[i], &route->dst_prefixlen) >= 0);
+
+ route_remove(route, link,
+ link_route_remove_handler);
+ }
+ }
+ }
+ }
+
+ r = address_new(&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(&route_gw);
+ if (r >= 0) {
+ route_gw->family = AF_INET;
+ route_gw->dst.in = gateway;
+ route_gw->dst_prefixlen = 32;
+ route_gw->scope = RT_SCOPE_LINK;
+
+ route_remove(route_gw, link,
+ link_route_remove_handler);
+ }
+
+ r = route_new(&route);
+ if (r >= 0) {
+ route->family = AF_INET;
+ route->gw.in = gateway;
+
+ route_remove(route, link,
+ link_route_remove_handler);
+ }
+ }
+
+ r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
+ if (r >= 0) {
+ r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
+ if (r >= 0)
+ prefixlen = in_addr_netmask_to_prefixlen(&netmask);
+
+ address->family = AF_INET;
+ address->in_addr.in = addr;
+ address->prefixlen = prefixlen;
+
+ address_remove(address, link, link_address_remove_handler);
+ }
+ }
+
+ if (link->network->dhcp_use_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_link_warning(link,
+ "DHCP error: could not reset MTU");
+ link_enter_failed(link);
+ return r;
+ }
+ }
+ }
+
+ if (link->network->dhcp_use_hostname) {
+ const char *hostname = NULL;
+
+ if (link->network->dhcp_hostname)
+ hostname = link->network->dhcp_hostname;
+ else
+ (void) sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
+
+ if (hostname) {
+ /* If a hostname was set due to the lease, then unset it now. */
+ r = link_set_hostname(link, NULL);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Failed to reset transient hostname: %m");
+ }
+ }
+
+ link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
+ link_dirty(link);
+ link->dhcp4_configured = false;
+
+ return 0;
+}
+
+static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m,
+ void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(link);
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EEXIST) {
+ log_link_error_errno(link, r, "Could not set DHCPv4 address: %m");
+ link_enter_failed(link);
+ } else if (r >= 0)
+ manager_rtnl_process_address(rtnl, m, link->manager);
+
+ link_set_dhcp_routes(link);
+
+ return 1;
+}
+
+static int dhcp4_update_address(Link *link,
+ struct in_addr *address,
+ struct in_addr *netmask,
+ uint32_t lifetime) {
+ _cleanup_address_free_ Address *addr = NULL;
+ unsigned prefixlen;
+ int r;
+
+ assert(address);
+ assert(netmask);
+ assert(lifetime);
+
+ prefixlen = in_addr_netmask_to_prefixlen(netmask);
+
+ r = address_new(&addr);
+ if (r < 0)
+ return r;
+
+ addr->family = AF_INET;
+ addr->in_addr.in.s_addr = address->s_addr;
+ addr->cinfo.ifa_prefered = lifetime;
+ addr->cinfo.ifa_valid = lifetime;
+ addr->prefixlen = prefixlen;
+ addr->broadcast.s_addr = address->s_addr | ~netmask->s_addr;
+
+ /* allow reusing an existing address and simply update its lifetime
+ * in case it already exists */
+ r = address_configure(addr, link, dhcp4_address_handler, true);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) {
+ sd_dhcp_lease *lease;
+ struct in_addr address;
+ struct in_addr netmask;
+ uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
+ int r;
+
+ assert(link);
+ assert(client);
+ assert(link->network);
+
+ r = sd_dhcp_client_get_lease(client, &lease);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "DHCP error: no lease: %m");
+
+ sd_dhcp_lease_unref(link->dhcp_lease);
+ link->dhcp4_configured = false;
+ link->dhcp_lease = sd_dhcp_lease_ref(lease);
+ link_dirty(link);
+
+ r = sd_dhcp_lease_get_address(lease, &address);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "DHCP error: no address: %m");
+
+ r = sd_dhcp_lease_get_netmask(lease, &netmask);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "DHCP error: no netmask: %m");
+
+ if (!link->network->dhcp_critical) {
+ r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
+ }
+
+ r = dhcp4_update_address(link, &address, &netmask, lifetime);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "Could not update IP address: %m");
+ link_enter_failed(link);
+ return r;
+ }
+
+ 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;
+ uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
+ int r;
+
+ assert(client);
+ assert(link);
+
+ r = sd_dhcp_client_get_lease(client, &lease);
+ if (r < 0)
+ return log_link_error_errno(link, r, "DHCP error: No lease: %m");
+
+ r = sd_dhcp_lease_get_address(lease, &address);
+ if (r < 0)
+ return log_link_error_errno(link, r, "DHCP error: No address: %m");
+
+ r = sd_dhcp_lease_get_netmask(lease, &netmask);
+ if (r < 0)
+ return log_link_error_errno(link, r, "DHCP error: No netmask: %m");
+
+ prefixlen = in_addr_netmask_to_prefixlen(&netmask);
+
+ r = sd_dhcp_lease_get_router(lease, &gateway);
+ if (r < 0 && r != -ENODATA)
+ return log_link_error_errno(link, r, "DHCP error: Could not get gateway: %m");
+
+ if (r >= 0)
+ log_struct(LOG_INFO,
+ LOG_LINK_INTERFACE(link),
+ LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
+ 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(LOG_INFO,
+ LOG_LINK_INTERFACE(link),
+ LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u",
+ ADDRESS_FMT_VAL(address),
+ prefixlen),
+ "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
+ "PREFIXLEN=%u", prefixlen,
+ NULL);
+
+ link->dhcp_lease = sd_dhcp_lease_ref(lease);
+ link_dirty(link);
+
+ if (link->network->dhcp_use_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_link_error_errno(link, r, "Failed to set MTU to %" PRIu16 ": %m", mtu);
+ }
+ }
+
+ if (link->network->dhcp_use_hostname) {
+ const char *hostname = NULL;
+
+ if (link->network->dhcp_hostname)
+ hostname = link->network->dhcp_hostname;
+ else
+ (void) sd_dhcp_lease_get_hostname(lease, &hostname);
+
+ if (hostname) {
+ r = link_set_hostname(link, hostname);
+ if (r < 0)
+ log_link_error_errno(link, r, "Failed to set transient hostname to '%s': %m", hostname);
+ }
+ }
+
+ if (link->network->dhcp_use_timezone) {
+ const char *tz = NULL;
+
+ (void) sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
+
+ if (tz) {
+ r = link_set_timezone(link, tz);
+ if (r < 0)
+ log_link_error_errno(link, r, "Failed to set timezone to '%s': %m", tz);
+ }
+ }
+
+ if (!link->network->dhcp_critical) {
+ r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
+ return r;
+ }
+ }
+
+ r = dhcp4_update_address(link, &address, &netmask, lifetime);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "Could not update IP address: %m");
+ link_enter_failed(link);
+ return r;
+ }
+
+ return 0;
+}
+static void dhcp4_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 SD_DHCP_CLIENT_EVENT_EXPIRED:
+ case SD_DHCP_CLIENT_EVENT_STOP:
+ case SD_DHCP_CLIENT_EVENT_IP_CHANGE:
+ if (link->network->dhcp_critical) {
+ log_link_error(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 == SD_DHCP_CLIENT_EVENT_IP_CHANGE) {
+ r = dhcp_lease_acquired(client, link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return;
+ }
+ }
+
+ break;
+ case SD_DHCP_CLIENT_EVENT_RENEW:
+ r = dhcp_lease_renew(client, link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return;
+ }
+ break;
+ case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE:
+ r = dhcp_lease_acquired(client, link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return;
+ }
+ break;
+ default:
+ if (event < 0)
+ log_link_warning_errno(link, event, "DHCP error: Client failed: %m");
+ else
+ log_link_warning(link, "DHCP unknown event: %i", event);
+ break;
+ }
+
+ return;
+}
+
+int dhcp4_configure(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
+
+ if (!link->dhcp_client) {
+ 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,
+ (const uint8_t *) &link->mac,
+ sizeof (link->mac), ARPHRD_ETHER);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_client_set_ifindex(link->dhcp_client, link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_client_set_request_broadcast(link->dhcp_client,
+ link->network->dhcp_broadcast);
+ if (r < 0)
+ return r;
+
+ if (link->mtu) {
+ r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
+ if (r < 0)
+ return r;
+ }
+
+ if (link->network->dhcp_use_mtu) {
+ r = sd_dhcp_client_set_request_option(link->dhcp_client,
+ SD_DHCP_OPTION_INTERFACE_MTU);
+ if (r < 0)
+ return r;
+ }
+
+ if (link->network->dhcp_use_routes) {
+ r = sd_dhcp_client_set_request_option(link->dhcp_client,
+ SD_DHCP_OPTION_STATIC_ROUTE);
+ if (r < 0)
+ return r;
+ r = sd_dhcp_client_set_request_option(link->dhcp_client,
+ SD_DHCP_OPTION_CLASSLESS_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;
+
+ 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_send_hostname) {
+ _cleanup_free_ char *hostname = NULL;
+ const char *hn = NULL;
+
+ if (!link->network->dhcp_hostname) {
+ hostname = gethostname_malloc();
+ if (!hostname)
+ return -ENOMEM;
+
+ hn = hostname;
+ } else
+ hn = link->network->dhcp_hostname;
+
+ if (!is_localhost(hn)) {
+ r = sd_dhcp_client_set_hostname(link->dhcp_client, hn);
+ if (r < 0)
+ return r;
+ }
+ }
+
+ if (link->network->dhcp_vendor_class_identifier) {
+ r = sd_dhcp_client_set_vendor_class_identifier(link->dhcp_client,
+ link->network->dhcp_vendor_class_identifier);
+ if (r < 0)
+ return r;
+ }
+
+ switch (link->network->dhcp_client_identifier) {
+ case DHCP_CLIENT_ID_DUID: {
+ /* If configured, apply user specified DUID and/or IAID */
+ const DUID *duid = link_duid(link);
+
+ r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
+ link->network->iaid,
+ 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,
+ (const uint8_t *) &link->mac,
+ sizeof(link->mac));
+ if (r < 0)
+ return r;
+ break;
+ default:
+ assert_not_reached("Unknown client identifier type.");
+ }
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 12:22:50 +0000