| /*** |
| 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 "alloc-util.h" |
| #include "dhcp-lease-internal.h" |
| #include "hostname-util.h" |
| #include "network-internal.h" |
| #include "networkd-link.h" |
| #include "networkd-manager.h" |
| #include "networkd-network.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 route_scope_from_address(const Route *route, const struct in_addr *self_addr) { |
| assert(route); |
| assert(self_addr); |
| |
| if (in_addr_is_localhost(AF_INET, &route->dst) || |
| (self_addr->s_addr && route->dst.in.s_addr == self_addr->s_addr)) |
| return RT_SCOPE_HOST; |
| else if (in4_addr_is_null(&route->gw.in)) |
| return RT_SCOPE_LINK; |
| else |
| return RT_SCOPE_UNIVERSE; |
| } |
| |
| static int link_set_dhcp_routes(Link *link) { |
| struct in_addr gateway, address; |
| _cleanup_free_ sd_dhcp_route **static_routes = NULL; |
| int r, n, i; |
| |
| assert(link); |
| |
| if (!link->dhcp_lease) /* link went down while we configured the IP addresses? */ |
| return 0; |
| |
| if (!link->network) /* link went down while we configured the IP addresses? */ |
| return 0; |
| |
| if (!link->network->dhcp_use_routes) |
| return 0; |
| |
| 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 = 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) { |
| _cleanup_route_free_ Route *route = NULL; |
| _cleanup_route_free_ Route *route_gw = NULL; |
| |
| 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; |
| 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; |
| 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 = manager_set_hostname(link->manager, 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 = manager_set_hostname(link->manager, 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 = manager_set_timezone(link->manager, 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; |
| } |
| |
| static int dhcp4_set_hostname(Link *link) { |
| _cleanup_free_ char *hostname = NULL; |
| const char *hn; |
| int r; |
| |
| assert(link); |
| |
| if (!link->network->dhcp_send_hostname) |
| hn = NULL; |
| else if (link->network->dhcp_hostname) |
| hn = link->network->dhcp_hostname; |
| else { |
| r = gethostname_strict(&hostname); |
| if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */ |
| return r; |
| |
| hn = hostname; |
| } |
| |
| return sd_dhcp_client_set_hostname(link->dhcp_client, hn); |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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_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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |