| /* 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 "escape.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-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" |
| #include "web-util.h" |
| |
| static int dhcp4_request_address_and_routes(Link *link, bool announce); |
| static int dhcp4_remove_all(Link *link); |
| |
| 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_release_old_lease(Link *link) { |
| Route *route; |
| int k, r = 0; |
| |
| assert(link); |
| |
| if (!link->dhcp_address_old && set_isempty(link->dhcp_routes_old)) |
| return 0; |
| |
| log_link_debug(link, "Removing old DHCPv4 address and routes."); |
| |
| SET_FOREACH(route, link->dhcp_routes_old) { |
| k = route_remove(route, NULL, link); |
| if (k < 0) |
| r = k; |
| } |
| |
| if (link->dhcp_address_old) { |
| k = address_remove(link->dhcp_address_old, link); |
| if (k < 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| static void dhcp4_check_ready(Link *link) { |
| int r; |
| |
| if (link->dhcp4_messages > 0) { |
| log_link_debug(link, "%s(): DHCPv4 address and routes are not set.", __func__); |
| return; |
| } |
| |
| if (!link->dhcp_address) { |
| log_link_debug(link, "%s(): DHCPv4 address is not set.", __func__); |
| return; |
| } |
| |
| if (!address_is_ready(link->dhcp_address)) { |
| log_link_debug(link, "%s(): DHCPv4 address is not ready.", __func__); |
| return; |
| } |
| |
| link->dhcp4_configured = true; |
| |
| /* New address and routes are configured now. Let's release old lease. */ |
| r = dhcp4_release_old_lease(link); |
| if (r < 0) { |
| link_enter_failed(link); |
| return; |
| } |
| |
| r = sd_ipv4ll_stop(link->ipv4ll); |
| if (r < 0) |
| log_link_warning_errno(link, r, "Failed to drop IPv4 link-local address, ignoring: %m"); |
| |
| link_check_ready(link); |
| } |
| |
| static int dhcp4_after_route_configure(Request *req, void *object) { |
| Route *route = object; |
| Link *link; |
| int r; |
| |
| assert(req); |
| assert(req->link); |
| assert(req->type == REQUEST_TYPE_ROUTE); |
| assert(route); |
| |
| link = req->link; |
| |
| r = set_ensure_put(&link->dhcp_routes, &route_hash_ops, route); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store DHCPv4 route: %m"); |
| |
| set_remove(link->dhcp_routes_old, route); |
| |
| return 0; |
| } |
| |
| static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { |
| int r; |
| |
| assert(link); |
| assert(link->dhcp4_messages > 0); |
| |
| link->dhcp4_messages--; |
| |
| if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) |
| return 1; |
| |
| r = sd_netlink_message_get_errno(m); |
| if (r == -ENETUNREACH && !link->dhcp4_route_retrying) { |
| |
| /* It seems kernel does not support that the prefix route cannot be configured with |
| * route table. Let's once drop the config and reconfigure them later. */ |
| |
| log_link_message_debug_errno(link, m, r, "Could not set DHCPv4 route, retrying later"); |
| link->dhcp4_route_failed = true; |
| link->manager->dhcp4_prefix_root_cannot_set_table = true; |
| } else if (r < 0 && r != -EEXIST) { |
| log_link_message_warning_errno(link, m, r, "Could not set DHCPv4 route"); |
| link_enter_failed(link); |
| return 1; |
| } |
| |
| if (link->dhcp4_messages == 0 && link->dhcp4_route_failed) { |
| link->dhcp4_route_failed = false; |
| link->dhcp4_route_retrying = true; |
| |
| r = dhcp4_remove_all(link); |
| if (r < 0) |
| link_enter_failed(link); |
| |
| r = link_request_static_nexthops(link, true); |
| if (r < 0) |
| link_enter_failed(link); |
| |
| r = link_request_static_routes(link, true); |
| if (r < 0) |
| link_enter_failed(link); |
| |
| r = dhcp4_request_address_and_routes(link, false); |
| if (r < 0) |
| link_enter_failed(link); |
| |
| return 1; |
| } |
| |
| dhcp4_check_ready(link); |
| |
| return 1; |
| } |
| |
| static int dhcp4_request_route(Route *in, Link *link) { |
| _cleanup_(route_freep) Route *route = in; |
| Request *req; |
| int r; |
| |
| assert(route); |
| assert(link); |
| |
| r = link_has_route(link, route); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| link->dhcp4_configured = false; |
| |
| r = link_request_route(link, TAKE_PTR(route), true, &link->dhcp4_messages, |
| dhcp4_route_handler, &req); |
| if (r <= 0) |
| return r; |
| |
| req->after_configure = dhcp4_after_route_configure; |
| |
| return 0; |
| } |
| |
| static bool link_prefixroute(Link *link) { |
| return !link->network->dhcp_route_table_set || |
| link->network->dhcp_route_table == RT_TABLE_MAIN || |
| link->manager->dhcp4_prefix_root_cannot_set_table; |
| } |
| |
| 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->family = AF_INET; |
| 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; |
| route->protocol = RTPROT_DHCP; |
| route->table = link_get_dhcp_route_table(link); |
| route->mtu = link->network->dhcp_route_mtu; |
| |
| 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->family = AF_INET; |
| route->dst.in = *gw; |
| route->dst_prefixlen = 32; |
| route->prefsrc.in = address; |
| route->scope = RT_SCOPE_LINK; |
| route->protocol = RTPROT_DHCP; |
| route->priority = link->network->dhcp_route_metric; |
| route->table = link_get_dhcp_route_table(link); |
| route->mtu = link->network->dhcp_route_mtu; |
| |
| return dhcp4_request_route(TAKE_PTR(route), link); |
| } |
| |
| static int dhcp4_request_route_auto( |
| Route *in, |
| Link *link, |
| const struct in_addr *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 (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, ignoring.", |
| IPV4_ADDRESS_FMT_VAL(route->dst.in), route->dst_prefixlen, |
| IPV4_ADDRESS_FMT_VAL(prefix), prefixlen); |
| return 0; |
| } |
| |
| 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; |
| bool classless_route = false, static_route = false; |
| struct in_addr default_gw = {}; |
| int n, r; |
| |
| assert(link); |
| assert(link->dhcp_lease); |
| assert(ret_default_gw); |
| |
| if (!link->network->dhcp_use_routes) |
| return 0; |
| |
| n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes); |
| if (IN_SET(n, 0, -ENODATA)) { |
| log_link_debug(link, "DHCP: No static routes received from DHCP server."); |
| return 0; |
| } |
| if (n < 0) |
| return n; |
| |
| for (int i = 0; i < n; i++) { |
| switch (sd_dhcp_route_get_option(static_routes[i])) { |
| case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE: |
| classless_route = true; |
| break; |
| case SD_DHCP_OPTION_STATIC_ROUTE: |
| static_route = true; |
| break; |
| } |
| } |
| |
| /* 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 (classless_route && static_route) |
| log_link_debug(link, "Classless static routes received from DHCP server: ignoring static-route option"); |
| |
| for (int i = 0; i < n; i++) { |
| _cleanup_(route_freep) Route *route = NULL; |
| struct in_addr gw; |
| |
| if (sd_dhcp_route_get_option(static_routes[i]) != |
| (classless_route ? SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE : SD_DHCP_OPTION_STATIC_ROUTE)) |
| continue; |
| |
| r = route_new(&route); |
| if (r < 0) |
| return r; |
| |
| route->family = AF_INET; |
| route->gw_family = AF_INET; |
| route->protocol = RTPROT_DHCP; |
| route->priority = link->network->dhcp_route_metric; |
| route->table = link_get_dhcp_route_table(link); |
| route->mtu = link->network->dhcp_route_mtu; |
| |
| r = sd_dhcp_route_get_gateway(static_routes[i], &gw); |
| if (r < 0) |
| return r; |
| |
| r = sd_dhcp_route_get_destination(static_routes[i], &route->dst.in); |
| if (r < 0) |
| return r; |
| |
| r = sd_dhcp_route_get_destination_prefix_length(static_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 (classless_route && |
| in4_addr_is_null(&route->dst.in) && route->dst_prefixlen == 0 && |
| in4_addr_is_null(&default_gw)) |
| default_gw = gw; |
| |
| r = dhcp4_request_route_auto(TAKE_PTR(route), link, &gw); |
| if (r < 0) |
| return r; |
| } |
| |
| *ret_default_gw = default_gw; |
| return classless_route; |
| } |
| |
| static int dhcp4_request_gateway(Link *link, struct in_addr *ret_gw) { |
| _cleanup_(route_freep) Route *route = NULL; |
| const struct in_addr *router; |
| struct in_addr address; |
| Route *rt; |
| int r; |
| |
| assert(link); |
| assert(link->dhcp_lease); |
| assert(ret_gw); |
| |
| if (!link->network->dhcp_use_gateway) |
| return 0; |
| |
| 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; |
| } |
| |
| /* 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->family = AF_INET; |
| route->gw_family = AF_INET; |
| route->gw.in = router[0]; |
| route->prefsrc.in = address; |
| route->protocol = RTPROT_DHCP; |
| route->priority = link->network->dhcp_route_metric; |
| route->table = link_get_dhcp_route_table(link); |
| route->mtu = link->network->dhcp_route_mtu; |
| |
| r = dhcp4_request_route(TAKE_PTR(route), link); |
| if (r < 0) |
| return r; |
| |
| HASHMAP_FOREACH(rt, link->network->routes_by_section) { |
| if (!rt->gateway_from_dhcp_or_ra) |
| continue; |
| |
| if (rt->gw_family != AF_INET) |
| continue; |
| |
| r = route_dup(rt, &route); |
| if (r < 0) |
| return r; |
| |
| route->gw.in = router[0]; |
| 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_dhcp_route_table(link); |
| if (route->mtu == 0) |
| route->mtu = link->network->dhcp_route_mtu; |
| |
| r = dhcp4_request_route(TAKE_PTR(route), link); |
| if (r < 0) |
| return r; |
| } |
| |
| *ret_gw = router[0]; |
| 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->family = AF_INET; |
| route->dst.in = servers[i]; |
| route->dst_prefixlen = 32; |
| route->protocol = RTPROT_DHCP; |
| route->priority = link->network->dhcp_route_metric; |
| route->table = link_get_dhcp_route_table(link); |
| route->mtu = link->network->dhcp_route_mtu; |
| |
| r = dhcp4_request_route_auto(TAKE_PTR(route), link, gw); |
| 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 = {}; |
| Route *rt; |
| int r; |
| |
| assert(link); |
| |
| if (!link->dhcp_lease) |
| return 0; |
| |
| while ((rt = set_steal_first(link->dhcp_routes))) { |
| r = set_ensure_put(&link->dhcp_routes_old, &route_hash_ops, rt); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store old DHCPv4 route: %m"); |
| } |
| |
| 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_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) { |
| uint16_t mtu; |
| int r; |
| |
| assert(link); |
| |
| if (!link->network->dhcp_use_mtu) |
| return 0; |
| |
| r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu); |
| if (r == -ENODATA) |
| return 0; |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP error: failed to get MTU from lease: %m"); |
| |
| if (link->original_mtu == 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 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; |
| } |
| |
| static int dhcp4_remove_all(Link *link) { |
| Route *route; |
| int k, r = 0; |
| |
| assert(link); |
| |
| SET_FOREACH(route, link->dhcp_routes) { |
| k = route_remove(route, NULL, link); |
| if (k < 0) |
| r = k; |
| } |
| |
| if (link->dhcp_address) { |
| k = address_remove(link->dhcp_address, link); |
| if (k < 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| int dhcp4_lease_lost(Link *link) { |
| int k, r = 0; |
| |
| assert(link); |
| assert(link->dhcp_lease); |
| |
| log_link_info(link, "DHCP lease lost"); |
| |
| link->dhcp4_configured = false; |
| |
| /* dhcp4_lease_lost() may be called during renewing IP address. */ |
| k = dhcp4_release_old_lease(link); |
| if (k < 0) |
| r = k; |
| |
| k = dhcp4_remove_all(link); |
| 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 (link->network->dhcp_send_decline) { |
| Address *a; |
| |
| /* The acquired address may be still ARP probing and not configured. */ |
| |
| SET_FOREACH(a, link->addresses_ipv4acd) |
| if (!a->is_static && address_get(link, a, NULL) < 0) { |
| Request req = { |
| .link = link, |
| .address = a, |
| }; |
| |
| log_link_debug(link, "Canceling the request to configure DHCPv4 address "IPV4_ADDRESS_FMT_STR, |
| IPV4_ADDRESS_FMT_VAL(a->in_addr.in)); |
| request_drop(ordered_set_get(link->manager->request_queue, &req)); |
| } |
| } |
| |
| 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_ready_callback(Address *address) { |
| assert(address); |
| |
| /* Do not call this again. */ |
| address->callback = NULL; |
| |
| dhcp4_check_ready(address->link); |
| return 0; |
| } |
| |
| static int dhcp4_after_address_configure(Request *req, void *object) { |
| Address *address = object; |
| Link *link; |
| int r; |
| |
| assert(req); |
| assert(req->link); |
| assert(req->type == REQUEST_TYPE_ADDRESS); |
| assert(address); |
| |
| link = req->link; |
| |
| if (!address_equal(link->dhcp_address, address)) { |
| if (link->dhcp_address_old && |
| !address_equal(link->dhcp_address_old, link->dhcp_address)) { |
| /* Still too old address exists? Let's remove it immediately. */ |
| r = address_remove(link->dhcp_address_old, link); |
| if (r < 0) |
| return r; |
| } |
| link->dhcp_address_old = link->dhcp_address; |
| } |
| |
| link->dhcp_address = address; |
| return 0; |
| } |
| |
| static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { |
| int r; |
| |
| assert(link); |
| assert(link->dhcp4_messages > 0); |
| |
| link->dhcp4_messages--; |
| |
| r = address_configure_handler_internal(rtnl, m, link, "Could not set DHCPv4 address"); |
| if (r <= 0) |
| return r; |
| |
| if (address_is_ready(link->dhcp_address)) { |
| r = dhcp4_address_ready_callback(link->dhcp_address); |
| if (r < 0) |
| link_enter_failed(link); |
| } else |
| link->dhcp_address->callback = dhcp4_address_ready_callback; |
| |
| return 1; |
| } |
| |
| static int dhcp4_request_address(Link *link, bool announce) { |
| _cleanup_(address_freep) Address *addr = NULL; |
| uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME; |
| struct in_addr address, netmask; |
| unsigned prefixlen; |
| Request *req; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| |
| if (!link->dhcp_lease) |
| return 0; |
| |
| 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"); |
| |
| if (!FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) { |
| 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"); |
| } |
| |
| 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 via "IPV4_ADDRESS_FMT_STR, |
| IPV4_ADDRESS_FMT_VAL(address), |
| prefixlen, |
| IPV4_ADDRESS_FMT_VAL(router[0])), |
| "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", |
| IPV4_ADDRESS_FMT_VAL(address), |
| prefixlen), |
| "ADDRESS="IPV4_ADDRESS_FMT_STR, IPV4_ADDRESS_FMT_VAL(address), |
| "PREFIXLEN=%u", prefixlen); |
| } |
| |
| r = address_new(&addr); |
| if (r < 0) |
| return log_oom(); |
| |
| 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; |
| if (prefixlen <= 30) |
| addr->broadcast.s_addr = address.s_addr | ~netmask.s_addr; |
| 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; |
| |
| if (address_get(link, addr, NULL) < 0) |
| link->dhcp4_configured = false; |
| |
| r = link_request_address(link, TAKE_PTR(addr), true, &link->dhcp4_messages, |
| dhcp4_address_handler, &req); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to request DHCPv4 address: %m"); |
| if (r == 0) |
| return 0; |
| |
| req->after_configure = dhcp4_after_address_configure; |
| |
| return 0; |
| } |
| |
| static int dhcp4_request_address_and_routes(Link *link, bool announce) { |
| int r; |
| |
| assert(link); |
| |
| r = dhcp4_request_address(link, announce); |
| if (r < 0) |
| return r; |
| |
| r = dhcp4_request_routes(link); |
| if (r < 0) |
| return r; |
| |
| link_set_state(link, LINK_STATE_CONFIGURING); |
| link_check_ready(link); |
| |
| return 0; |
| } |
| |
| static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) { |
| sd_dhcp_lease *lease; |
| int r; |
| |
| assert(link); |
| 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"); |
| |
| sd_dhcp_lease_unref(link->dhcp_lease); |
| link->dhcp_lease = sd_dhcp_lease_ref(lease); |
| link_dirty(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); |
| } |
| } |
| |
| 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_deny_listed(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 (set_contains(link->network->dhcp_deny_listed_ip, UINT32_TO_PTR(addr.s_addr))) { |
| log_struct(LOG_DEBUG, |
| LOG_LINK_INTERFACE(link), |
| LOG_LINK_MESSAGE(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 dhcp_server_is_allow_listed(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 (set_contains(link->network->dhcp_allow_listed_ip, UINT32_TO_PTR(addr.s_addr))) { |
| log_struct(LOG_DEBUG, |
| LOG_LINK_INTERFACE(link), |
| LOG_LINK_MESSAGE(link, "DHCPv4 server IP address "IPV4_ADDRESS_FMT_STR" found in allow-list, accepting offer", |
| IPV4_ADDRESS_FMT_VAL(addr))); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static int dhcp4_handler(sd_dhcp_client *client, int event, void *userdata) { |
| Link *link = userdata; |
| int r; |
| |
| assert(link); |
| 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"); |
| |
| 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: |
| if (!set_isempty(link->network->dhcp_allow_listed_ip)) { |
| r = dhcp_server_is_allow_listed(link, client); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| return -ENOMSG; |
| } else { |
| r = dhcp_server_is_deny_listed(link, client); |
| if (r < 0) |
| 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"); |
| |
| 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_warning_errno(link, r, "DHCP4 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, "DHCP4 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m"); |
| else if (r < 0) |
| return log_link_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 CLIENT: Failed to set client ID: %m"); |
| break; |
| } |
| default: |
| assert_not_reached("Unknown client identifier type."); |
| } |
| |
| return 0; |
| } |
| |
| 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_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_foreign) { |
| if (a->family != AF_INET) |
| continue; |
| if (link_address_is_dynamic(link, a)) |
| break; |
| } |
| |
| if (!a) |
| return 0; |
| |
| log_link_debug(link, "DHCP4 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->sd_device && sd_device_get_property_value(link->sd_device, "ID_NET_DHCP_BROADCAST", &val) >= 0) { |
| r = parse_boolean(val); |
| if (r < 0) |
| log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to parse ID_NET_DHCP_BROADCAST, ignoring: %m"); |
| else |
| log_link_debug(link, "DHCP4 CLIENT: Detected ID_NET_DHCP_BROADCAST='%d'.", r); |
| |
| } |
| return r == true; |
| } |
| |
| int dhcp4_configure(Link *link) { |
| sd_dhcp_option *send_option; |
| void *request_options; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| |
| if (!link_dhcp4_enabled(link)) |
| return 0; |
| |
| if (link->dhcp_client) |
| return -EBUSY; /* Already configured. */ |
| |
| r = dhcp4_configure_duid(link); |
| if (r <= 0) |
| return r; |
| |
| r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to allocate DHCP4 client: %m"); |
| |
| r = sd_dhcp_client_attach_event(link->dhcp_client, link->manager->event, 0); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to attach event to DHCP4 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_warning_errno(link, r, "DHCP4 CLIENT: Failed to set MAC address: %m"); |
| |
| r = sd_dhcp_client_set_ifindex(link->dhcp_client, link->ifindex); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set ifindex: %m"); |
| |
| r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_INTERFACE_MTU); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_LIST); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_NEW_TZDB_TIMEZONE); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for timezone: %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_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 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_warning_errno(link, r, "DHCP4 CLIENT: Failed set to lease lifetime: %m"); |
| } |
| |
| r = dhcp4_set_request_address(link); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set initial DHCPv4 address: %m"); |
| |
| return dhcp4_set_client_identifier(link); |
| } |
| |
| int dhcp4_update_mac(Link *link) { |
| int r; |
| |
| assert(link); |
| |
| if (!link->dhcp_client) |
| return 0; |
| |
| 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; |
| |
| return dhcp4_set_client_identifier(link); |
| } |
| |
| int dhcp4_start(Link *link) { |
| assert(link); |
| |
| if (!link->dhcp_client) |
| return 0; |
| |
| if (sd_dhcp_client_is_running(link->dhcp_client) > 0) |
| return 0; |
| |
| log_link_debug(link, "Acquiring DHCPv4 lease"); |
| |
| return sd_dhcp_client_start(link->dhcp_client); |
| } |
| |
| 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 = data; |
| uint64_t a; |
| int r; |
| |
| assert(network); |
| 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_acl_ip_address( |
| 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 = data; |
| Set **acl; |
| int r; |
| |
| assert(filename); |
| assert(lvalue); |
| assert(rvalue); |
| assert(data); |
| |
| acl = STR_IN_SET(lvalue, "DenyList", "BlackList") ? &network->dhcp_deny_listed_ip : &network->dhcp_allow_listed_ip; |
| |
| if (isempty(rvalue)) { |
| *acl = set_free(*acl); |
| return 0; |
| } |
| |
| for (const char *p = rvalue;;) { |
| _cleanup_free_ char *n = NULL; |
| union in_addr_union ip; |
| |
| r = extract_first_word(&p, &n, NULL, 0); |
| if (r == -ENOMEM) |
| return log_oom(); |
| if (r < 0) { |
| log_syntax(unit, LOG_WARNING, filename, line, r, |
| "Failed to parse DHCP '%s=' IP address, ignoring assignment: %s", |
| lvalue, rvalue); |
| return 0; |
| } |
| if (r == 0) |
| return 0; |
| |
| r = in_addr_from_string(AF_INET, n, &ip); |
| if (r < 0) { |
| log_syntax(unit, LOG_WARNING, filename, line, r, |
| "DHCP '%s=' IP address is invalid, ignoring assignment: %s", lvalue, n); |
| continue; |
| } |
| |
| r = set_ensure_put(acl, NULL, UINT32_TO_PTR(ip.in.s_addr)); |
| if (r < 0) |
| log_syntax(unit, LOG_WARNING, filename, line, r, |
| "Failed to store DHCP '%s=' IP address '%s', ignoring assignment: %m", lvalue, n); |
| } |
| } |
| |
| 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) { |
| |
| assert(filename); |
| assert(lvalue); |
| assert(rvalue); |
| |
| if (streq(rvalue, "CS4")) |
| *((int *)data) = IPTOS_CLASS_CS4; |
| else if (streq(rvalue, "CS6")) |
| *((int *)data) = IPTOS_CLASS_CS6; |
| else |
| log_syntax(unit, LOG_WARNING, filename, line, 0, |
| "Failed to parse IPServiceType type '%s', ignoring.", rvalue); |
| |
| return 0; |
| } |
| |
| int config_parse_dhcp_mud_url( |
| 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) { |
| |
| _cleanup_free_ char *unescaped = NULL; |
| Network *network = data; |
| int r; |
| |
| assert(filename); |
| assert(lvalue); |
| assert(rvalue); |
| |
| if (isempty(rvalue)) { |
| network->dhcp_mudurl = mfree(network->dhcp_mudurl); |
| return 0; |
| } |
| |
| r = cunescape(rvalue, 0, &unescaped); |
| if (r < 0) { |
| log_syntax(unit, LOG_WARNING, filename, line, r, |
| "Failed to Failed to unescape MUD URL, ignoring: %s", rvalue); |
| return 0; |
| } |
| |
| if (!http_url_is_valid(unescaped) || strlen(unescaped) > 255) { |
| log_syntax(unit, LOG_WARNING, filename, line, 0, |
| "Failed to parse MUD URL '%s', ignoring: %m", rvalue); |
| |
| return 0; |
| } |
| |
| return free_and_strdup_warn(&network->dhcp_mudurl, unescaped); |
| } |
| |
| 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; |
| uint32_t k; |
| |
| 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")) |
| k = CACHE_INFO_INFINITY_LIFE_TIME; |
| else { |
| log_syntax(unit, LOG_WARNING, filename, line, 0, |
| "Invalid LeaseLifetime= value, ignoring: %s", rvalue); |
| return 0; |
| } |
| |
| network->dhcp_fallback_lease_lifetime = k; |
| |
| return 0; |
| } |
| |
| 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"); |
