diff options
Diffstat (limited to 'src/network/networkd-dhcp4.c')
| -rw-r--r-- | src/network/networkd-dhcp4.c | 660 |
1 files changed, 0 insertions, 660 deletions
diff --git a/src/network/networkd-dhcp4.c b/src/network/networkd-dhcp4.c deleted file mode 100644 index 76d3d132ea..0000000000 --- a/src/network/networkd-dhcp4.c +++ /dev/null @@ -1,660 +0,0 @@ -/*** - 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.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; -} |