diff options
Diffstat (limited to 'src/network/networkd-dhcp4.c')
| -rw-r--r-- | src/network/networkd-dhcp4.c | 1784 |
1 files changed, 1784 insertions, 0 deletions
diff --git a/src/network/networkd-dhcp4.c b/src/network/networkd-dhcp4.c new file mode 100644 index 0000000..eef7633 --- /dev/null +++ b/src/network/networkd-dhcp4.c @@ -0,0 +1,1784 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <netinet/in.h> +#include <netinet/ip.h> +#include <linux/if.h> +#include <linux/if_arp.h> + +#include "alloc-util.h" +#include "dhcp-client-internal.h" +#include "hostname-setup.h" +#include "hostname-util.h" +#include "parse-util.h" +#include "network-internal.h" +#include "networkd-address.h" +#include "networkd-dhcp-prefix-delegation.h" +#include "networkd-dhcp4.h" +#include "networkd-ipv4acd.h" +#include "networkd-link.h" +#include "networkd-manager.h" +#include "networkd-network.h" +#include "networkd-nexthop.h" +#include "networkd-queue.h" +#include "networkd-route.h" +#include "networkd-setlink.h" +#include "networkd-state-file.h" +#include "string-table.h" +#include "strv.h" +#include "sysctl-util.h" + +void network_adjust_dhcp4(Network *network) { + assert(network); + + if (!FLAGS_SET(network->dhcp, ADDRESS_FAMILY_IPV4)) + return; + + if (network->dhcp_use_gateway < 0) + network->dhcp_use_gateway = network->dhcp_use_routes; + + /* RFC7844 section 3.: MAY contain the Client Identifier option + * Section 3.5: clients MUST use client identifiers based solely on the link-layer address + * NOTE: Using MAC, as it does not reveal extra information, and some servers might not answer + * if this option is not sent */ + if (network->dhcp_anonymize && + network->dhcp_client_identifier >= 0 && + network->dhcp_client_identifier != DHCP_CLIENT_ID_MAC) { + log_warning("%s: ClientIdentifier= is set, although Anonymize=yes. Using ClientIdentifier=mac.", + network->filename); + network->dhcp_client_identifier = DHCP_CLIENT_ID_MAC; + } + + if (network->dhcp_client_identifier < 0) + network->dhcp_client_identifier = network->dhcp_anonymize ? DHCP_CLIENT_ID_MAC : DHCP_CLIENT_ID_DUID; +} + +static int dhcp4_remove_address_and_routes(Link *link, bool only_marked) { + Address *address; + Route *route; + int k, r = 0; + + assert(link); + + SET_FOREACH(route, link->routes) { + if (route->source != NETWORK_CONFIG_SOURCE_DHCP4) + continue; + if (only_marked && !route_is_marked(route)) + continue; + + k = route_remove(route); + if (k < 0) + r = k; + + route_cancel_request(route, link); + } + + SET_FOREACH(address, link->addresses) { + if (address->source != NETWORK_CONFIG_SOURCE_DHCP4) + continue; + if (only_marked && !address_is_marked(address)) + continue; + + k = address_remove(address); + if (k < 0) + r = k; + + address_cancel_request(address); + } + + return r; +} + +static int dhcp4_address_get(Link *link, Address **ret) { + Address *address; + + assert(link); + + SET_FOREACH(address, link->addresses) { + if (address->source != NETWORK_CONFIG_SOURCE_DHCP4) + continue; + if (address_is_marked(address)) + continue; + + if (ret) + *ret = address; + return 0; + } + + return -ENOENT; +} + +static int dhcp4_address_ready_callback(Address *address) { + assert(address); + assert(address->link); + + /* Do not call this again. */ + address->callback = NULL; + + return dhcp4_check_ready(address->link); +} + +int dhcp4_check_ready(Link *link) { + Address *address; + int r; + + assert(link); + + if (link->dhcp4_messages > 0) { + log_link_debug(link, "%s(): DHCPv4 address and routes are not set.", __func__); + return 0; + } + + if (dhcp4_address_get(link, &address) < 0) { + log_link_debug(link, "%s(): DHCPv4 address is not set.", __func__); + return 0; + } + + if (!address_is_ready(address)) { + log_link_debug(link, "%s(): DHCPv4 address is not ready.", __func__); + address->callback = dhcp4_address_ready_callback; + return 0; + } + + link->dhcp4_configured = true; + log_link_debug(link, "DHCPv4 address and routes set."); + + /* New address and routes are configured now. Let's release old lease. */ + r = dhcp4_remove_address_and_routes(link, /* only_marked = */ true); + if (r < 0) + return r; + + r = sd_ipv4ll_stop(link->ipv4ll); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to drop IPv4 link-local address: %m"); + + link_check_ready(link); + return 0; +} + +static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Route *route) { + int r; + + assert(m); + assert(link); + + r = sd_netlink_message_get_errno(m); + if (r < 0 && r != -EEXIST) { + log_link_message_warning_errno(link, m, r, "Could not set DHCPv4 route"); + link_enter_failed(link); + return 1; + } + + r = dhcp4_check_ready(link); + if (r < 0) + link_enter_failed(link); + + return 1; +} + +static int dhcp4_request_route(Route *in, Link *link) { + _cleanup_(route_freep) Route *route = in; + struct in_addr server; + Route *existing; + int r; + + assert(route); + assert(link); + assert(link->dhcp_lease); + + r = sd_dhcp_lease_get_server_identifier(link->dhcp_lease, &server); + if (r < 0) + return log_link_debug_errno(link, r, "Failed to get DHCP server IP address: %m"); + + route->source = NETWORK_CONFIG_SOURCE_DHCP4; + route->provider.in = server; + route->family = AF_INET; + if (!route->protocol_set) + route->protocol = RTPROT_DHCP; + if (!route->priority_set) + route->priority = link->network->dhcp_route_metric; + if (!route->table_set) + route->table = link_get_dhcp4_route_table(link); + if (route->mtu == 0) + route->mtu = link->network->dhcp_route_mtu; + + if (route_get(NULL, link, route, &existing) < 0) /* This is a new route. */ + link->dhcp4_configured = false; + else + route_unmark(existing); + + return link_request_route(link, TAKE_PTR(route), true, &link->dhcp4_messages, + dhcp4_route_handler, NULL); +} + +static bool link_prefixroute(Link *link) { + return !link->network->dhcp_route_table_set || + link->network->dhcp_route_table == RT_TABLE_MAIN; +} + +static int dhcp4_request_prefix_route(Link *link) { + _cleanup_(route_freep) Route *route = NULL; + struct in_addr address, netmask; + int r; + + assert(link); + assert(link->dhcp_lease); + + if (link_prefixroute(link)) + /* When true, the route will be created by kernel. See dhcp4_update_address(). */ + return 0; + + r = sd_dhcp_lease_get_address(link->dhcp_lease, &address); + if (r < 0) + return r; + + r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask); + if (r < 0) + return r; + + r = route_new(&route); + if (r < 0) + return r; + + route->dst.in.s_addr = address.s_addr & netmask.s_addr; + route->dst_prefixlen = in4_addr_netmask_to_prefixlen(&netmask); + route->prefsrc.in = address; + route->scope = RT_SCOPE_LINK; + + return dhcp4_request_route(TAKE_PTR(route), link); +} + +static int dhcp4_request_route_to_gateway(Link *link, const struct in_addr *gw) { + _cleanup_(route_freep) Route *route = NULL; + struct in_addr address; + int r; + + assert(link); + assert(link->dhcp_lease); + assert(gw); + + r = sd_dhcp_lease_get_address(link->dhcp_lease, &address); + if (r < 0) + return r; + + r = route_new(&route); + if (r < 0) + return r; + + route->dst.in = *gw; + route->dst_prefixlen = 32; + route->prefsrc.in = address; + route->scope = RT_SCOPE_LINK; + + return dhcp4_request_route(TAKE_PTR(route), link); +} + +static int dhcp4_request_route_auto( + Route *in, + Link *link, + const struct in_addr *gw, + bool force_use_gw) { + + _cleanup_(route_freep) Route *route = in; + struct in_addr address, netmask, prefix; + uint8_t prefixlen; + int r; + + assert(route); + assert(link); + assert(link->dhcp_lease); + assert(gw); + + r = sd_dhcp_lease_get_address(link->dhcp_lease, &address); + if (r < 0) + return r; + + r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask); + if (r < 0) + return r; + + prefix.s_addr = address.s_addr & netmask.s_addr; + prefixlen = in4_addr_netmask_to_prefixlen(&netmask); + + if (in4_addr_is_localhost(&route->dst.in)) { + if (in4_addr_is_set(gw)) + log_link_debug(link, "DHCP: requested route destination "IPV4_ADDRESS_FMT_STR"/%u is localhost, " + "ignoring gateway address "IPV4_ADDRESS_FMT_STR, + IPV4_ADDRESS_FMT_VAL(route->dst.in), route->dst_prefixlen, IPV4_ADDRESS_FMT_VAL(*gw)); + + route->scope = RT_SCOPE_HOST; + route->gw_family = AF_UNSPEC; + route->gw = IN_ADDR_NULL; + route->prefsrc = IN_ADDR_NULL; + + } else if (in4_addr_equal(&route->dst.in, &address)) { + if (in4_addr_is_set(gw)) + log_link_debug(link, "DHCP: requested route destination "IPV4_ADDRESS_FMT_STR"/%u is equivalent to the acquired address, " + "ignoring gateway address "IPV4_ADDRESS_FMT_STR, + IPV4_ADDRESS_FMT_VAL(route->dst.in), route->dst_prefixlen, IPV4_ADDRESS_FMT_VAL(*gw)); + + route->scope = RT_SCOPE_HOST; + route->gw_family = AF_UNSPEC; + route->gw = IN_ADDR_NULL; + route->prefsrc.in = address; + + } else if (!force_use_gw && + route->dst_prefixlen >= prefixlen && + (route->dst.in.s_addr & netmask.s_addr) == prefix.s_addr) { + if (in4_addr_is_set(gw)) + log_link_debug(link, "DHCP: requested route destination "IPV4_ADDRESS_FMT_STR"/%u is in the assigned network " + IPV4_ADDRESS_FMT_STR"/%u, ignoring gateway address "IPV4_ADDRESS_FMT_STR, + IPV4_ADDRESS_FMT_VAL(route->dst.in), route->dst_prefixlen, + IPV4_ADDRESS_FMT_VAL(prefix), prefixlen, + IPV4_ADDRESS_FMT_VAL(*gw)); + + route->scope = RT_SCOPE_LINK; + route->gw_family = AF_UNSPEC; + route->gw = IN_ADDR_NULL; + route->prefsrc.in = address; + + } else if (in4_addr_is_null(gw)) { + log_link_debug(link, "DHCP: requested route destination "IPV4_ADDRESS_FMT_STR"/%u is not in the assigned network " + IPV4_ADDRESS_FMT_STR"/%u, but no gateway is specified, using 'link' scope.", + IPV4_ADDRESS_FMT_VAL(route->dst.in), route->dst_prefixlen, + IPV4_ADDRESS_FMT_VAL(prefix), prefixlen); + + route->scope = RT_SCOPE_LINK; + route->gw_family = AF_UNSPEC; + route->gw = IN_ADDR_NULL; + route->prefsrc.in = address; + + } else { + r = dhcp4_request_route_to_gateway(link, gw); + if (r < 0) + return r; + + route->scope = RT_SCOPE_UNIVERSE; + route->gw_family = AF_INET; + route->gw.in = *gw; + route->prefsrc.in = address; + } + + return dhcp4_request_route(TAKE_PTR(route), link); +} + +static int dhcp4_request_static_routes(Link *link, struct in_addr *ret_default_gw) { + _cleanup_free_ sd_dhcp_route **static_routes = NULL, **classless_routes = NULL; + size_t n_static_routes, n_classless_routes, n; + struct in_addr default_gw = {}; + sd_dhcp_route **routes; + int r; + + assert(link); + assert(link->dhcp_lease); + assert(ret_default_gw); + + r = sd_dhcp_lease_get_static_routes(link->dhcp_lease, &static_routes); + if (r == -ENODATA) + n_static_routes = 0; + else if (r < 0) + return r; + else + n_static_routes = r; + + r = sd_dhcp_lease_get_classless_routes(link->dhcp_lease, &classless_routes); + if (r == -ENODATA) + n_classless_routes = 0; + else if (r < 0) + return r; + else + n_classless_routes = r; + + if (n_classless_routes == 0 && n_static_routes == 0) { + log_link_debug(link, "DHCP: No static routes received from DHCP server."); + return 0; + } + + /* 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 (n_classless_routes > 0 && n_static_routes > 0) + log_link_debug(link, "Classless static routes received from DHCP server: ignoring static-route option"); + + if (!link->network->dhcp_use_routes) { + + /* Even if UseRoutes=no, try to find default gateway to make semi-static routes and + * routes to DNS or NTP servers can be configured in later steps. */ + + for (size_t i = 0; i < n_classless_routes; i++) { + struct in_addr dst; + uint8_t prefixlen; + + r = sd_dhcp_route_get_destination(classless_routes[i], &dst); + if (r < 0) + return r; + + if (in4_addr_is_set(&dst)) + continue; + + r = sd_dhcp_route_get_destination_prefix_length(classless_routes[i], &prefixlen); + if (r < 0) + return r; + + if (prefixlen != 0) + continue; + + r = sd_dhcp_route_get_gateway(classless_routes[i], ret_default_gw); + if (r < 0) + return r; + + break; + } + + /* Do not return 1 here, to ensure the router option can override the default gateway + * that was found. */ + return 0; + } + + if (n_classless_routes > 0) { + n = n_classless_routes; + routes = classless_routes; + } else if (n_static_routes > 0){ + n = n_static_routes; + routes = static_routes; + } else + assert_not_reached(); + + for (size_t i = 0; i < n; i++) { + _cleanup_(route_freep) Route *route = NULL; + struct in_addr gw; + + r = route_new(&route); + if (r < 0) + return r; + + route->gw_family = AF_INET; + + r = sd_dhcp_route_get_gateway(routes[i], &gw); + if (r < 0) + return r; + + r = sd_dhcp_route_get_destination(routes[i], &route->dst.in); + if (r < 0) + return r; + + r = sd_dhcp_route_get_destination_prefix_length(routes[i], &route->dst_prefixlen); + if (r < 0) + return r; + + /* When classless static routes are provided, then router option will be ignored. To + * use the default gateway later in other routes, e.g., routes to dns servers, here we + * need to find the default gateway in the classless static routes. */ + if (n_classless_routes > 0 && + in4_addr_is_null(&route->dst.in) && route->dst_prefixlen == 0 && + in4_addr_is_null(&default_gw)) + default_gw = gw; + + /* Do not ignore the gateway given by the classless route option even if the destination is + * in the same network. See issue #28280. */ + r = dhcp4_request_route_auto(TAKE_PTR(route), link, &gw, /* force_use_gw = */ n_classless_routes > 0); + if (r < 0) + return r; + } + + *ret_default_gw = default_gw; + return n_classless_routes > 0; +} + +static int dhcp4_request_gateway(Link *link, struct in_addr *gw) { + _cleanup_(route_freep) Route *route = NULL; + const struct in_addr *router; + struct in_addr address; + int r; + + assert(link); + assert(link->dhcp_lease); + assert(gw); + + r = sd_dhcp_lease_get_address(link->dhcp_lease, &address); + if (r < 0) + return r; + + r = sd_dhcp_lease_get_router(link->dhcp_lease, &router); + if (IN_SET(r, 0, -ENODATA)) { + log_link_debug(link, "DHCP: No gateway received from DHCP server."); + return 0; + } + if (r < 0) + return r; + if (in4_addr_is_null(&router[0])) { + log_link_debug(link, "DHCP: Received gateway address is null."); + return 0; + } + + if (!link->network->dhcp_use_gateway) { + /* When no classless static route is provided, even if UseGateway=no, use the gateway + * address to configure semi-static routes or routes to DNS or NTP servers. Note, if + * neither UseRoutes= nor UseGateway= is disabled, use the default gateway in classless + * static routes if provided (in that case, in4_addr_is_null(gw) below is true). */ + if (in4_addr_is_null(gw)) + *gw = router[0]; + return 0; + } + + /* The dhcp netmask may mask out the gateway. First, add an explicit route for the gateway host + * so that we can route no matter the netmask or existing kernel route tables. */ + r = dhcp4_request_route_to_gateway(link, &router[0]); + if (r < 0) + return r; + + r = route_new(&route); + if (r < 0) + return r; + + /* Next, add a default gateway. */ + route->gw_family = AF_INET; + route->gw.in = router[0]; + route->prefsrc.in = address; + + r = dhcp4_request_route(TAKE_PTR(route), link); + if (r < 0) + return r; + + /* When no classless static route is provided, or UseRoutes=no, then use the router address to + * configure semi-static routes and routes to DNS or NTP servers in later steps. */ + *gw = router[0]; + return 0; +} + +static int dhcp4_request_semi_static_routes(Link *link, const struct in_addr *gw) { + Route *rt; + int r; + + assert(link); + assert(link->dhcp_lease); + assert(link->network); + assert(gw); + + if (in4_addr_is_null(gw)) + return 0; + + HASHMAP_FOREACH(rt, link->network->routes_by_section) { + _cleanup_(route_freep) Route *route = NULL; + + if (!rt->gateway_from_dhcp_or_ra) + continue; + + if (rt->gw_family != AF_INET) + continue; + + r = dhcp4_request_route_to_gateway(link, gw); + if (r < 0) + return r; + + r = route_dup(rt, &route); + if (r < 0) + return r; + + route->gw.in = *gw; + + r = dhcp4_request_route(TAKE_PTR(route), link); + if (r < 0) + return r; + } + + return 0; +} + +static int dhcp4_request_routes_to_servers( + Link *link, + const struct in_addr *servers, + size_t n_servers, + const struct in_addr *gw) { + + int r; + + assert(link); + assert(link->dhcp_lease); + assert(link->network); + assert(servers || n_servers == 0); + assert(gw); + + for (size_t i = 0; i < n_servers; i++) { + _cleanup_(route_freep) Route *route = NULL; + + if (in4_addr_is_null(&servers[i])) + continue; + + r = route_new(&route); + if (r < 0) + return r; + + route->dst.in = servers[i]; + route->dst_prefixlen = 32; + + r = dhcp4_request_route_auto(TAKE_PTR(route), link, gw, /* force_use_gw = */ false); + if (r < 0) + return r; + } + + return 0; +} + +static int dhcp4_request_routes_to_dns(Link *link, const struct in_addr *gw) { + const struct in_addr *dns; + int r; + + assert(link); + assert(link->dhcp_lease); + assert(link->network); + assert(gw); + + if (!link->network->dhcp_use_dns || + !link->network->dhcp_routes_to_dns) + return 0; + + r = sd_dhcp_lease_get_dns(link->dhcp_lease, &dns); + if (IN_SET(r, 0, -ENODATA)) + return 0; + if (r < 0) + return r; + + return dhcp4_request_routes_to_servers(link, dns, r, gw); +} + +static int dhcp4_request_routes_to_ntp(Link *link, const struct in_addr *gw) { + const struct in_addr *ntp; + int r; + + assert(link); + assert(link->dhcp_lease); + assert(link->network); + assert(gw); + + if (!link->network->dhcp_use_ntp || + !link->network->dhcp_routes_to_ntp) + return 0; + + r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &ntp); + if (IN_SET(r, 0, -ENODATA)) + return 0; + if (r < 0) + return r; + + return dhcp4_request_routes_to_servers(link, ntp, r, gw); +} + +static int dhcp4_request_routes(Link *link) { + struct in_addr gw = {}; + int r; + + assert(link); + assert(link->dhcp_lease); + + r = dhcp4_request_prefix_route(link); + if (r < 0) + return log_link_error_errno(link, r, "DHCP error: Could not request prefix route: %m"); + + r = dhcp4_request_static_routes(link, &gw); + if (r < 0) + return log_link_error_errno(link, r, "DHCP error: Could not request static routes: %m"); + if (r == 0) { + /* 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. */ + r = dhcp4_request_gateway(link, &gw); + if (r < 0) + return log_link_error_errno(link, r, "DHCP error: Could not request gateway: %m"); + } + + r = dhcp4_request_semi_static_routes(link, &gw); + if (r < 0) + return log_link_error_errno(link, r, "DHCP error: Could not request routes with Gateway=_dhcp4 setting: %m"); + + r = dhcp4_request_routes_to_dns(link, &gw); + if (r < 0) + return log_link_error_errno(link, r, "DHCP error: Could not request routes to DNS servers: %m"); + + r = dhcp4_request_routes_to_ntp(link, &gw); + if (r < 0) + return log_link_error_errno(link, r, "DHCP error: Could not request routes to NTP servers: %m"); + + return 0; +} + +static int dhcp_reset_mtu(Link *link) { + int r; + + assert(link); + + if (!link->network->dhcp_use_mtu) + return 0; + + r = link_request_to_set_mtu(link, link->original_mtu); + if (r < 0) + return log_link_error_errno(link, r, "DHCP error: Could not queue request to reset MTU: %m"); + + return 0; +} + +static int dhcp_reset_hostname(Link *link) { + const char *hostname; + int r; + + assert(link); + + if (!link->network->dhcp_use_hostname) + return 0; + + hostname = link->network->dhcp_hostname; + if (!hostname) + (void) sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname); + + if (!hostname) + return 0; + + /* If a hostname was set due to the lease, then unset it now. */ + r = manager_set_hostname(link->manager, NULL); + if (r < 0) + return log_link_error_errno(link, r, "DHCP error: Failed to reset transient hostname: %m"); + + return 0; +} + +int dhcp4_lease_lost(Link *link) { + int k, r = 0; + + assert(link); + assert(link->dhcp_lease); + assert(link->network); + + log_link_info(link, "DHCP lease lost"); + + link->dhcp4_configured = false; + + if (link->network->dhcp_use_6rd && + dhcp4_lease_has_pd_prefix(link->dhcp_lease)) + dhcp4_pd_prefix_lost(link); + + k = dhcp4_remove_address_and_routes(link, /* only_marked = */ false); + if (k < 0) + r = k; + + k = dhcp_reset_mtu(link); + if (k < 0) + r = k; + + k = dhcp_reset_hostname(link); + if (k < 0) + r = k; + + link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease); + link_dirty(link); + + /* If one of the above failed. Do not request nexthops and routes. */ + if (r < 0) + return r; + + r = link_request_static_nexthops(link, true); + if (r < 0) + return r; + + return link_request_static_routes(link, true); +} + +static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Address *address) { + int r; + + assert(link); + + r = address_configure_handler_internal(rtnl, m, link, "Could not set DHCPv4 address"); + if (r <= 0) + return r; + + r = dhcp4_check_ready(link); + if (r < 0) + link_enter_failed(link); + + return 1; +} + +static int dhcp4_request_address(Link *link, bool announce) { + _cleanup_(address_freep) Address *addr = NULL; + struct in_addr address, netmask, server; + unsigned prefixlen; + Address *existing; + usec_t lifetime_usec; + int r; + + assert(link); + assert(link->manager); + assert(link->network); + assert(link->dhcp_lease); + + r = sd_dhcp_lease_get_address(link->dhcp_lease, &address); + if (r < 0) + return log_link_warning_errno(link, r, "DHCP error: no address: %m"); + + r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask); + if (r < 0) + return log_link_warning_errno(link, r, "DHCP error: no netmask: %m"); + + r = sd_dhcp_lease_get_server_identifier(link->dhcp_lease, &server); + if (r < 0) + return log_link_debug_errno(link, r, "DHCP error: failed to get DHCP server IP address: %m"); + + if (!FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) { + uint32_t lifetime_sec; + usec_t now_usec; + + r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime_sec); + if (r < 0) + return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m"); + + assert_se(sd_event_now(link->manager->event, CLOCK_BOOTTIME, &now_usec) >= 0); + lifetime_usec = sec_to_usec(lifetime_sec, now_usec); + } else + lifetime_usec = USEC_INFINITY; + + prefixlen = in4_addr_netmask_to_prefixlen(&netmask); + + if (announce) { + const struct in_addr *router; + + r = sd_dhcp_lease_get_router(link->dhcp_lease, &router); + if (r < 0 && r != -ENODATA) + return log_link_error_errno(link, r, "DHCP error: Could not get gateway: %m"); + + if (r > 0 && in4_addr_is_set(&router[0])) + log_struct(LOG_INFO, + LOG_LINK_INTERFACE(link), + LOG_LINK_MESSAGE(link, "DHCPv4 address "IPV4_ADDRESS_FMT_STR"/%u, gateway "IPV4_ADDRESS_FMT_STR" acquired from "IPV4_ADDRESS_FMT_STR, + IPV4_ADDRESS_FMT_VAL(address), + prefixlen, + IPV4_ADDRESS_FMT_VAL(router[0]), + IPV4_ADDRESS_FMT_VAL(server)), + "ADDRESS="IPV4_ADDRESS_FMT_STR, IPV4_ADDRESS_FMT_VAL(address), + "PREFIXLEN=%u", prefixlen, + "GATEWAY="IPV4_ADDRESS_FMT_STR, IPV4_ADDRESS_FMT_VAL(router[0])); + else + log_struct(LOG_INFO, + LOG_LINK_INTERFACE(link), + LOG_LINK_MESSAGE(link, "DHCPv4 address "IPV4_ADDRESS_FMT_STR"/%u acquired from "IPV4_ADDRESS_FMT_STR, + IPV4_ADDRESS_FMT_VAL(address), + prefixlen, + IPV4_ADDRESS_FMT_VAL(server)), + "ADDRESS="IPV4_ADDRESS_FMT_STR, IPV4_ADDRESS_FMT_VAL(address), + "PREFIXLEN=%u", prefixlen); + } + + r = address_new(&addr); + if (r < 0) + return log_oom(); + + addr->source = NETWORK_CONFIG_SOURCE_DHCP4; + addr->provider.in = server; + addr->family = AF_INET; + addr->in_addr.in.s_addr = address.s_addr; + addr->lifetime_preferred_usec = lifetime_usec; + addr->lifetime_valid_usec = lifetime_usec; + addr->prefixlen = prefixlen; + address_set_broadcast(addr, link); + SET_FLAG(addr->flags, IFA_F_NOPREFIXROUTE, !link_prefixroute(link)); + addr->route_metric = link->network->dhcp_route_metric; + addr->duplicate_address_detection = link->network->dhcp_send_decline ? ADDRESS_FAMILY_IPV4 : ADDRESS_FAMILY_NO; + + r = free_and_strdup_warn(&addr->label, link->network->dhcp_label); + if (r < 0) + return r; + + r = free_and_strdup_warn(&addr->netlabel, link->network->dhcp_netlabel); + if (r < 0) + return r; + + if (address_get(link, addr, &existing) < 0) /* The address is new. */ + link->dhcp4_configured = false; + else + address_unmark(existing); + + r = link_request_address(link, TAKE_PTR(addr), true, &link->dhcp4_messages, + dhcp4_address_handler, NULL); + if (r < 0) + return log_link_error_errno(link, r, "Failed to request DHCPv4 address: %m"); + + return 0; +} + +static int dhcp4_request_address_and_routes(Link *link, bool announce) { + int r; + + assert(link); + + link_mark_addresses(link, NETWORK_CONFIG_SOURCE_DHCP4); + link_mark_routes(link, NETWORK_CONFIG_SOURCE_DHCP4); + + r = dhcp4_request_address(link, announce); + if (r < 0) + return r; + + r = dhcp4_request_routes(link); + if (r < 0) + return r; + + if (!link->dhcp4_configured) { + link_set_state(link, LINK_STATE_CONFIGURING); + link_check_ready(link); + } + + return 0; +} + +static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) { + _cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *old_lease = NULL; + sd_dhcp_lease *lease; + int r; + + assert(link); + assert(link->network); + assert(client); + + r = sd_dhcp_client_get_lease(client, &lease); + if (r < 0) + return log_link_warning_errno(link, r, "DHCP error: no lease: %m"); + + old_lease = TAKE_PTR(link->dhcp_lease); + link->dhcp_lease = sd_dhcp_lease_ref(lease); + link_dirty(link); + + if (link->network->dhcp_use_6rd) { + if (dhcp4_lease_has_pd_prefix(link->dhcp_lease)) { + r = dhcp4_pd_prefix_acquired(link); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to process 6rd option: %m"); + } else if (dhcp4_lease_has_pd_prefix(old_lease)) + dhcp4_pd_prefix_lost(link); + } + + return dhcp4_request_address_and_routes(link, false); +} + +static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) { + sd_dhcp_lease *lease; + 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"); + + sd_dhcp_lease_unref(link->dhcp_lease); + 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_request_to_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 *dhcpname = NULL; + _cleanup_free_ char *hostname = NULL; + + if (link->network->dhcp_hostname) + dhcpname = link->network->dhcp_hostname; + else + (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 DHCP hostname received, shortened from '%s' to '%s'", dhcpname, 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_use_6rd && + dhcp4_lease_has_pd_prefix(link->dhcp_lease)) { + r = dhcp4_pd_prefix_acquired(link); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to process 6rd option: %m"); + } + + return dhcp4_request_address_and_routes(link, true); +} + +static int dhcp_lease_ip_change(sd_dhcp_client *client, Link *link) { + int r; + + r = dhcp_lease_acquired(client, link); + if (r < 0) + (void) dhcp4_lease_lost(link); + + return r; +} + +static int dhcp_server_is_filtered(Link *link, sd_dhcp_client *client) { + sd_dhcp_lease *lease; + struct in_addr addr; + int r; + + assert(link); + assert(link->network); + assert(client); + + r = sd_dhcp_client_get_lease(client, &lease); + if (r < 0) + return log_link_error_errno(link, r, "Failed to get DHCP lease: %m"); + + r = sd_dhcp_lease_get_server_identifier(lease, &addr); + if (r < 0) + return log_link_debug_errno(link, r, "Failed to get DHCP server IP address: %m"); + + if (in4_address_is_filtered(&addr, link->network->dhcp_allow_listed_ip, link->network->dhcp_deny_listed_ip)) { + if (DEBUG_LOGGING) { + if (link->network->dhcp_allow_listed_ip) + log_link_debug(link, "DHCPv4 server IP address "IPV4_ADDRESS_FMT_STR" not found in allow-list, ignoring offer.", + IPV4_ADDRESS_FMT_VAL(addr)); + else + log_link_debug(link, "DHCPv4 server IP address "IPV4_ADDRESS_FMT_STR" found in deny-list, ignoring offer.", + IPV4_ADDRESS_FMT_VAL(addr)); + } + + return true; + } + + return false; +} + +static int dhcp4_handler(sd_dhcp_client *client, int event, void *userdata) { + Link *link = ASSERT_PTR(userdata); + int r; + + assert(link->network); + assert(link->manager); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return 0; + + switch (event) { + case SD_DHCP_CLIENT_EVENT_STOP: + if (link->ipv4ll) { + log_link_debug(link, "DHCP client is stopped. Acquiring IPv4 link-local address"); + + if (in4_addr_is_set(&link->network->ipv4ll_start_address)) { + r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address); + if (r < 0) + return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m"); + } + + r = sd_ipv4ll_start(link->ipv4ll); + if (r < 0) + return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m"); + } + + if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) { + log_link_notice(link, "DHCPv4 connection considered critical, ignoring request to reconfigure it."); + return 0; + } + + if (link->dhcp_lease) { + if (link->network->dhcp_send_release) { + r = sd_dhcp_client_send_release(client); + if (r < 0) + log_link_full_errno(link, + ERRNO_IS_DISCONNECT(r) ? LOG_DEBUG : LOG_WARNING, + r, "Failed to send DHCP RELEASE, ignoring: %m"); + } + + r = dhcp4_lease_lost(link); + if (r < 0) { + link_enter_failed(link); + return r; + } + } + + break; + case SD_DHCP_CLIENT_EVENT_EXPIRED: + if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) { + log_link_notice(link, "DHCPv4 connection considered critical, ignoring request to reconfigure it."); + return 0; + } + + if (link->dhcp_lease) { + r = dhcp4_lease_lost(link); + if (r < 0) { + link_enter_failed(link); + return r; + } + } + + break; + case SD_DHCP_CLIENT_EVENT_IP_CHANGE: + if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) { + log_link_notice(link, "DHCPv4 connection considered critical, ignoring request to reconfigure it."); + return 0; + } + + r = dhcp_lease_ip_change(client, link); + if (r < 0) { + link_enter_failed(link); + return r; + } + + break; + case SD_DHCP_CLIENT_EVENT_RENEW: + r = dhcp_lease_renew(client, link); + if (r < 0) { + link_enter_failed(link); + return r; + } + break; + case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE: + r = dhcp_lease_acquired(client, link); + if (r < 0) { + link_enter_failed(link); + return r; + } + break; + case SD_DHCP_CLIENT_EVENT_SELECTING: + r = dhcp_server_is_filtered(link, client); + if (r < 0) { + link_enter_failed(link); + return r; + } + if (r > 0) + return -ENOMSG; + break; + + case SD_DHCP_CLIENT_EVENT_TRANSIENT_FAILURE: + if (link->ipv4ll && !sd_ipv4ll_is_running(link->ipv4ll)) { + log_link_debug(link, "Problems acquiring DHCP lease, acquiring IPv4 link-local address"); + + if (in4_addr_is_set(&link->network->ipv4ll_start_address)) { + r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address); + if (r < 0) + return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m"); + } + + r = sd_ipv4ll_start(link->ipv4ll); + if (r < 0) + return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m"); + } + 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 0; +} + +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 log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to get hostname: %m"); + + hn = hostname; + } + + r = sd_dhcp_client_set_hostname(link->dhcp_client, hn); + if (r == -EINVAL && hostname) + /* Ignore error when the machine's hostname is not suitable to send in DHCP packet. */ + log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m"); + else if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set hostname: %m"); + + return 0; +} + +static int dhcp4_set_client_identifier(Link *link) { + int r; + + assert(link); + assert(link->network); + assert(link->dhcp_client); + + switch (link->network->dhcp_client_identifier) { + case DHCP_CLIENT_ID_DUID: { + /* If configured, apply user specified DUID and IAID */ + const DUID *duid = link_get_dhcp4_duid(link); + + if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0) + r = sd_dhcp_client_set_iaid_duid_llt(link->dhcp_client, + link->network->dhcp_iaid_set, + link->network->dhcp_iaid, + duid->llt_time); + else + r = sd_dhcp_client_set_iaid_duid(link->dhcp_client, + link->network->dhcp_iaid_set, + link->network->dhcp_iaid, + duid->type, + duid->raw_data_len > 0 ? duid->raw_data : NULL, + duid->raw_data_len); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set IAID+DUID: %m"); + break; + } + case DHCP_CLIENT_ID_DUID_ONLY: { + /* If configured, apply user specified DUID */ + const DUID *duid = link_get_dhcp4_duid(link); + + if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0) + r = sd_dhcp_client_set_duid_llt(link->dhcp_client, + duid->llt_time); + else + 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 log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set DUID: %m"); + break; + } + case DHCP_CLIENT_ID_MAC: { + const uint8_t *hw_addr = link->hw_addr.bytes; + size_t hw_addr_len = link->hw_addr.length; + + if (link->iftype == ARPHRD_INFINIBAND && hw_addr_len == INFINIBAND_ALEN) { + /* set_client_id expects only last 8 bytes of an IB address */ + hw_addr += INFINIBAND_ALEN - 8; + hw_addr_len -= INFINIBAND_ALEN - 8; + } + + r = sd_dhcp_client_set_client_id(link->dhcp_client, + link->iftype, + hw_addr, + hw_addr_len); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set client ID: %m"); + break; + } + default: + assert_not_reached(); + } + + return 0; +} + +static int dhcp4_set_request_address(Link *link) { + Address *a; + + assert(link); + assert(link->network); + assert(link->dhcp_client); + + if (!FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) + return 0; + + SET_FOREACH(a, link->addresses) { + if (a->source != NETWORK_CONFIG_SOURCE_FOREIGN) + continue; + if (a->family != AF_INET) + continue; + if (link_address_is_dynamic(link, a)) + break; + } + + if (!a) + return 0; + + log_link_debug(link, "DHCPv4 CLIENT: requesting " IPV4_ADDRESS_FMT_STR, IPV4_ADDRESS_FMT_VAL(a->in_addr.in)); + + return sd_dhcp_client_set_request_address(link->dhcp_client, &a->in_addr.in); +} + +static bool link_needs_dhcp_broadcast(Link *link) { + const char *val; + int r; + + assert(link); + assert(link->network); + + /* Return the setting in DHCP[4].RequestBroadcast if specified. Otherwise return the device property + * ID_NET_DHCP_BROADCAST setting, which may be set for interfaces requiring that the DHCPOFFER message + * is being broadcast because they can't handle unicast messages while not fully configured. + * If neither is set or a failure occurs, return false, which is the default for this flag. + */ + r = link->network->dhcp_broadcast; + if (r < 0 && link->dev && sd_device_get_property_value(link->dev, "ID_NET_DHCP_BROADCAST", &val) >= 0) { + r = parse_boolean(val); + if (r < 0) + log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to parse ID_NET_DHCP_BROADCAST, ignoring: %m"); + else + log_link_debug(link, "DHCPv4 CLIENT: Detected ID_NET_DHCP_BROADCAST='%d'.", r); + + } + return r == true; +} + +static int dhcp4_configure(Link *link) { + sd_dhcp_option *send_option; + void *request_options; + int r; + + assert(link); + assert(link->network); + + if (link->dhcp_client) + return log_link_debug_errno(link, SYNTHETIC_ERRNO(EBUSY), "DHCPv4 client is already configured."); + + r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to allocate DHCPv4 client: %m"); + + r = sd_dhcp_client_attach_event(link->dhcp_client, link->manager->event, 0); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to attach event to DHCPv4 client: %m"); + + r = sd_dhcp_client_set_mac(link->dhcp_client, + link->hw_addr.bytes, + link->bcast_addr.length > 0 ? link->bcast_addr.bytes : NULL, + link->hw_addr.length, link->iftype); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set MAC address: %m"); + + r = sd_dhcp_client_set_ifindex(link->dhcp_client, link->ifindex); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set ifindex: %m"); + + r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set callback: %m"); + + r = sd_dhcp_client_set_request_broadcast(link->dhcp_client, link_needs_dhcp_broadcast(link)); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for broadcast: %m"); + + if (link->mtu > 0) { + r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set MTU: %m"); + } + + if (!link->network->dhcp_anonymize) { + if (link->network->dhcp_use_mtu) { + r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_MTU_INTERFACE); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for MTU: %m"); + } + + 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 log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for static route: %m"); + + r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for classless static route: %m"); + } + + if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) { + r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_DOMAIN_SEARCH); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for domain search list: %m"); + } + + 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 log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for NTP server: %m"); + } + + if (link->network->dhcp_use_sip) { + r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_SIP_SERVER); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for SIP server: %m"); + } + + if (link->network->dhcp_use_timezone) { + r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_TZDB_TIMEZONE); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for timezone: %m"); + } + + if (link->network->dhcp_use_6rd) { + r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_6RD); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for 6rd: %m"); + } + + SET_FOREACH(request_options, link->network->dhcp_request_options) { + uint32_t option = PTR_TO_UINT32(request_options); + + r = sd_dhcp_client_set_request_option(link->dhcp_client, option); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for '%u': %m", option); + } + + ORDERED_HASHMAP_FOREACH(send_option, link->network->dhcp_client_send_options) { + r = sd_dhcp_client_add_option(link->dhcp_client, send_option); + if (r == -EEXIST) + continue; + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set send option: %m"); + } + + ORDERED_HASHMAP_FOREACH(send_option, link->network->dhcp_client_send_vendor_options) { + r = sd_dhcp_client_add_vendor_option(link->dhcp_client, send_option); + if (r == -EEXIST) + continue; + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set send option: %m"); + } + + 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 log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set vendor class identifier: %m"); + } + + if (link->network->dhcp_mudurl) { + r = sd_dhcp_client_set_mud_url(link->dhcp_client, link->network->dhcp_mudurl); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set MUD URL: %m"); + } + + if (link->network->dhcp_user_class) { + r = sd_dhcp_client_set_user_class(link->dhcp_client, link->network->dhcp_user_class); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set user class: %m"); + } + } + + if (link->network->dhcp_client_port > 0) { + r = sd_dhcp_client_set_client_port(link->dhcp_client, link->network->dhcp_client_port); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set listen port: %m"); + } + + if (link->network->dhcp_max_attempts > 0) { + r = sd_dhcp_client_set_max_attempts(link->dhcp_client, link->network->dhcp_max_attempts); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set max attempts: %m"); + } + + if (link->network->dhcp_ip_service_type >= 0) { + r = sd_dhcp_client_set_service_type(link->dhcp_client, link->network->dhcp_ip_service_type); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set IP service type: %m"); + } + + if (link->network->dhcp_fallback_lease_lifetime > 0) { + r = sd_dhcp_client_set_fallback_lease_lifetime(link->dhcp_client, link->network->dhcp_fallback_lease_lifetime); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed set to lease lifetime: %m"); + } + + r = dhcp4_set_request_address(link); + if (r < 0) + return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set initial DHCPv4 address: %m"); + + return dhcp4_set_client_identifier(link); +} + +int dhcp4_update_mac(Link *link) { + bool restart; + int r; + + assert(link); + + if (!link->dhcp_client) + return 0; + + restart = sd_dhcp_client_is_running(link->dhcp_client); + + r = sd_dhcp_client_stop(link->dhcp_client); + if (r < 0) + return r; + + r = sd_dhcp_client_set_mac(link->dhcp_client, + link->hw_addr.bytes, + link->bcast_addr.length > 0 ? link->bcast_addr.bytes : NULL, + link->hw_addr.length, link->iftype); + if (r < 0) + return r; + + r = dhcp4_set_client_identifier(link); + if (r < 0) + return r; + + if (restart) { + r = sd_dhcp_client_start(link->dhcp_client); + if (r < 0) + return r; + } + + return 0; +} + +int dhcp4_start(Link *link) { + int r; + + assert(link); + + if (!link->dhcp_client) + return 0; + + if (!link_has_carrier(link)) + return 0; + + if (sd_dhcp_client_is_running(link->dhcp_client) > 0) + return 0; + + r = sd_dhcp_client_start(link->dhcp_client); + if (r < 0) + return r; + + return 1; +} + +static int dhcp4_configure_duid(Link *link) { + assert(link); + + if (!IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY)) + return 1; + + return dhcp_configure_duid(link, link_get_dhcp4_duid(link)); +} + +static int dhcp4_process_request(Request *req, Link *link, void *userdata) { + int r; + + assert(link); + + if (!link_is_ready_to_configure(link, /* allow_unmanaged = */ false)) + return 0; + + r = dhcp4_configure_duid(link); + if (r <= 0) + return r; + + r = dhcp4_configure(link); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to configure DHCPv4 client: %m"); + + r = dhcp4_start(link); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m"); + + log_link_debug(link, "DHCPv4 client is configured%s.", + r > 0 ? ", acquiring DHCPv4 lease" : ""); + return 1; +} + +int link_request_dhcp4_client(Link *link) { + int r; + + assert(link); + + if (!link_dhcp4_enabled(link)) + return 0; + + if (link->dhcp_client) + return 0; + + r = link_queue_request(link, REQUEST_TYPE_DHCP4_CLIENT, dhcp4_process_request, NULL); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to request configuring of the DHCPv4 client: %m"); + + log_link_debug(link, "Requested configuring of the DHCPv4 client."); + return 0; +} + +int config_parse_dhcp_max_attempts( + const char *unit, + const char *filename, + unsigned line, + const char *section, + unsigned section_line, + const char *lvalue, + int ltype, + const char *rvalue, + void *data, + void *userdata) { + + Network *network = ASSERT_PTR(data); + uint64_t a; + int r; + + assert(lvalue); + assert(rvalue); + + if (isempty(rvalue)) { + network->dhcp_max_attempts = 0; + return 0; + } + + if (streq(rvalue, "infinity")) { + network->dhcp_max_attempts = UINT64_MAX; + return 0; + } + + r = safe_atou64(rvalue, &a); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "Failed to parse DHCP maximum attempts, ignoring: %s", rvalue); + return 0; + } + + if (a == 0) { + log_syntax(unit, LOG_WARNING, filename, line, 0, + "%s= must be positive integer or 'infinity', ignoring: %s", lvalue, rvalue); + return 0; + } + + network->dhcp_max_attempts = a; + + return 0; +} + +int config_parse_dhcp_ip_service_type( + const char *unit, + const char *filename, + unsigned line, + const char *section, + unsigned section_line, + const char *lvalue, + int ltype, + const char *rvalue, + void *data, + void *userdata) { + + int *tos = ASSERT_PTR(data); + + assert(filename); + assert(lvalue); + assert(rvalue); + + if (isempty(rvalue)) + *tos = -1; /* use sd_dhcp_client's default (currently, CS6). */ + else if (streq(rvalue, "none")) + *tos = 0; + else if (streq(rvalue, "CS4")) + *tos = IPTOS_CLASS_CS4; + else if (streq(rvalue, "CS6")) + *tos = IPTOS_CLASS_CS6; + else + log_syntax(unit, LOG_WARNING, filename, line, 0, + "Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue); + + return 0; +} + +int config_parse_dhcp_fallback_lease_lifetime( + const char *unit, + const char *filename, + unsigned line, + const char *section, + unsigned section_line, + const char *lvalue, + int ltype, + const char *rvalue, + void *data, + void *userdata) { + + Network *network = userdata; + + assert(filename); + assert(section); + assert(lvalue); + assert(rvalue); + assert(data); + + if (isempty(rvalue)) { + network->dhcp_fallback_lease_lifetime = 0; + return 0; + } + + /* We accept only "forever" or "infinity". */ + if (!STR_IN_SET(rvalue, "forever", "infinity")) { + log_syntax(unit, LOG_WARNING, filename, line, 0, + "Invalid LeaseLifetime= value, ignoring: %s", rvalue); + return 0; + } + + network->dhcp_fallback_lease_lifetime = UINT32_MAX; + + return 0; +} + +int config_parse_dhcp_label( + const char *unit, + const char *filename, + unsigned line, + const char *section, + unsigned section_line, + const char *lvalue, + int ltype, + const char *rvalue, + void *data, + void *userdata) { + + char **label = ASSERT_PTR(data); + + assert(filename); + assert(lvalue); + assert(rvalue); + + if (isempty(rvalue)) { + *label = mfree(*label); + return 0; + } + + if (!address_label_valid(rvalue)) { + log_syntax(unit, LOG_WARNING, filename, line, 0, + "Address label is too long or invalid, ignoring assignment: %s", rvalue); + return 0; + } + + return free_and_strdup_warn(label, rvalue); +} + +static const char* const dhcp_client_identifier_table[_DHCP_CLIENT_ID_MAX] = { + [DHCP_CLIENT_ID_MAC] = "mac", + [DHCP_CLIENT_ID_DUID] = "duid", + [DHCP_CLIENT_ID_DUID_ONLY] = "duid-only", +}; + +DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(dhcp_client_identifier, DHCPClientIdentifier); +DEFINE_CONFIG_PARSE_ENUM(config_parse_dhcp_client_identifier, dhcp_client_identifier, DHCPClientIdentifier, + "Failed to parse client identifier type"); |