| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| 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 "hostname-util.h" |
| #include "networkd-link.h" |
| #include "network-internal.h" |
| #include "dhcp-lease-internal.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); |
| |
| link->dhcp4_messages --; |
| |
| r = sd_netlink_message_get_errno(m); |
| if (r < 0 && r != -EEXIST) { |
| log_link_error(link, "could not set DHCPv4 route: %s", |
| strerror(-r)); |
| link_enter_failed(link); |
| } |
| |
| if (!link->dhcp4_messages) { |
| link->dhcp4_configured = true; |
| link_client_handler(link); |
| } |
| |
| return 1; |
| } |
| |
| static int link_set_dhcp_routes(Link *link) { |
| struct in_addr gateway; |
| struct sd_dhcp_route *static_routes; |
| int r, n, i; |
| |
| assert(link); |
| assert(link->dhcp_lease); |
| |
| r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway); |
| if (r < 0 && r != -ENOENT) { |
| log_link_warning(link, |
| "DHCP error: could not get gateway: %s", |
| strerror(-r)); |
| return r; |
| } |
| 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) { |
| log_link_warning(link, |
| "DHCP error: could not get address: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| r = route_new_dynamic(&route, RTPROT_DHCP); |
| if (r < 0) { |
| log_link_error(link, |
| "Could not allocate route: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| r = route_new_dynamic(&route_gw, RTPROT_DHCP); |
| if (r < 0) { |
| log_link_error(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->prefsrc_addr.in = address; |
| route_gw->scope = RT_SCOPE_LINK; |
| route_gw->metrics = link->network->dhcp_route_metric; |
| |
| r = route_configure(route_gw, link, &dhcp4_route_handler); |
| if (r < 0) { |
| log_link_warning(link, |
| "could not set host route: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| link->dhcp4_messages ++; |
| |
| route->family = AF_INET; |
| route->in_addr.in = gateway; |
| route->prefsrc_addr.in = address; |
| route->metrics = link->network->dhcp_route_metric; |
| |
| r = route_configure(route, link, &dhcp4_route_handler); |
| if (r < 0) { |
| log_link_warning(link, |
| "could not set routes: %s", |
| strerror(-r)); |
| link_enter_failed(link); |
| return r; |
| } |
| |
| link->dhcp4_messages ++; |
| } |
| |
| n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes); |
| if (n == -ENOENT) |
| return 0; |
| if (n < 0) { |
| log_link_warning(link, |
| "DHCP error: could not get routes: %s", |
| strerror(-n)); |
| |
| return n; |
| } |
| |
| for (i = 0; i < n; i++) { |
| _cleanup_route_free_ Route *route = NULL; |
| |
| r = route_new_dynamic(&route, RTPROT_DHCP); |
| if (r < 0) { |
| log_link_error(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 = link->network->dhcp_route_metric; |
| |
| r = route_configure(route, link, &dhcp4_route_handler); |
| if (r < 0) { |
| log_link_warning(link, |
| "could not set host route: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| 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_routes) { |
| struct sd_dhcp_route *routes; |
| 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_dynamic(&route, RTPROT_UNSPEC); |
| 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, |
| &link_route_drop_handler); |
| } |
| } |
| } |
| } |
| |
| 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, RTPROT_UNSPEC); |
| 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, |
| &link_route_drop_handler); |
| } |
| |
| r = route_new_dynamic(&route, RTPROT_UNSPEC); |
| if (r >= 0) { |
| route->family = AF_INET; |
| route->in_addr.in = gateway; |
| |
| route_drop(route, link, |
| &link_route_drop_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_drop(address, link, &link_address_drop_handler); |
| } |
| } |
| |
| 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_link_warning(link, |
| "DHCP error: could not reset MTU"); |
| link_enter_failed(link); |
| return r; |
| } |
| } |
| } |
| |
| if (link->network->dhcp_hostname) { |
| const char *hostname = NULL; |
| |
| if (!link->network->hostname) |
| r = sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname); |
| else |
| hostname = link->network->hostname; |
| |
| if (r >= 0 || 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); |
| |
| } |
| } |
| |
| link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease); |
| 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(link, "could not set DHCPv4 address: %s", |
| strerror(-r)); |
| link_enter_failed(link); |
| } else if (r >= 0) |
| link_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_dynamic(&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; |
| |
| /* 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(addr, link, &dhcp4_address_handler); |
| 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) { |
| log_link_warning(link, "DHCP error: no lease %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| sd_dhcp_lease_unref(link->dhcp_lease); |
| link->dhcp4_configured = false; |
| link->dhcp_lease = sd_dhcp_lease_ref(lease); |
| |
| r = sd_dhcp_lease_get_address(lease, &address); |
| if (r < 0) { |
| log_link_warning(link, "DHCP error: no address: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| r = sd_dhcp_lease_get_netmask(lease, &netmask); |
| if (r < 0) { |
| log_link_warning(link, "DHCP error: no netmask: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| if (!link->network->dhcp_critical) { |
| r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, |
| &lifetime); |
| if (r < 0) { |
| log_link_warning(link, |
| "DHCP error: no lifetime: %s", |
| strerror(-r)); |
| return r; |
| } |
| } |
| |
| r = dhcp4_update_address(link, &address, &netmask, lifetime); |
| if (r < 0) { |
| log_link_warning(link, "could not update IP address: %s", |
| strerror(-r)); |
| 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 != -ENOENT) |
| 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); |
| |
| 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_link_error_errno(link, r, "Failed to set MTU to %" PRIu16 ": %m", mtu); |
| } |
| } |
| |
| if (link->network->dhcp_hostname) { |
| const char *hostname = NULL; |
| |
| if (!link->network->hostname) |
| r = sd_dhcp_lease_get_hostname(lease, &hostname); |
| else |
| hostname = link->network->hostname; |
| |
| if (r >= 0 || 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_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 DHCP_EVENT_EXPIRED: |
| case DHCP_EVENT_STOP: |
| case DHCP_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 == DHCP_EVENT_IP_CHANGE) { |
| r = dhcp_lease_acquired(client, link); |
| 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; |
| } |
| break; |
| default: |
| if (event < 0) |
| log_link_warning(link, |
| "DHCP error: client failed: %s", |
| strerror(-event)); |
| else |
| log_link_warning(link, |
| "DHCP unknown event: %d", |
| event); |
| break; |
| } |
| |
| return; |
| } |
| |
| int dhcp4_configure(Link *link) { |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(link->network->dhcp & ADDRESS_FAMILY_IPV4); |
| |
| 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_index(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_mtu) { |
| r = sd_dhcp_client_set_request_option(link->dhcp_client, |
| DHCP_OPTION_INTERFACE_MTU); |
| 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 = NULL; |
| const char *hn = NULL; |
| |
| if (!link->network->hostname) { |
| hostname = gethostname_malloc(); |
| if (!hostname) |
| return -ENOMEM; |
| |
| hn = hostname; |
| } else |
| hn = link->network->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: |
| /* Library defaults to this. */ |
| 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; |
| } |