summaryrefslogtreecommitdiffstats
path: root/src/network/networkd-dhcp4.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/network/networkd-dhcp4.c')
-rw-r--r--src/network/networkd-dhcp4.c2025
1 files changed, 2025 insertions, 0 deletions
diff --git a/src/network/networkd-dhcp4.c b/src/network/networkd-dhcp4.c
new file mode 100644
index 0000000..49c452d
--- /dev/null
+++ b/src/network/networkd-dhcp4.c
@@ -0,0 +1,2025 @@
+/* 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-bus.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;
+
+ /* By default, RapidCommit= is enabled when Anonymize=no and neither AllowList= nor DenyList= is specified. */
+ if (network->dhcp_use_rapid_commit < 0)
+ network->dhcp_use_rapid_commit =
+ !network->dhcp_anonymize &&
+ set_isempty(network->dhcp_allow_listed_ip) &&
+ set_isempty(network->dhcp_deny_listed_ip);
+}
+
+static int dhcp4_prefix_covers(
+ Link *link,
+ const struct in_addr *in_prefix,
+ uint8_t in_prefixlen) {
+
+ struct in_addr prefix;
+ uint8_t prefixlen;
+ int r;
+
+ assert(link);
+ assert(link->dhcp_lease);
+ assert(in_prefix);
+
+ /* Return true if the input address or address range is in the assigned network.
+ * E.g. if the DHCP server provides 192.168.0.100/24, then this returns true for the address or
+ * address range in 192.168.0.0/24, and returns false otherwise. */
+
+ r = sd_dhcp_lease_get_prefix(link->dhcp_lease, &prefix, &prefixlen);
+ if (r < 0)
+ return r;
+
+ return in4_addr_prefix_covers_full(&prefix, prefixlen, in_prefix, in_prefixlen);
+}
+
+static int dhcp4_get_router(Link *link, struct in_addr *ret) {
+ const struct in_addr *routers;
+ int r;
+
+ assert(link);
+ assert(link->dhcp_lease);
+ assert(ret);
+
+ r = sd_dhcp_lease_get_router(link->dhcp_lease, &routers);
+ if (r < 0)
+ return r;
+
+ /* The router option may provide multiple routers, We only use the first non-null address. */
+
+ FOREACH_ARRAY(router, routers, r) {
+ if (in4_addr_is_null(router))
+ continue;
+
+ *ret = *router;
+ return 0;
+ }
+
+ return -ENODATA;
+}
+
+static int dhcp4_get_classless_static_or_static_routes(Link *link, sd_dhcp_route ***ret_routes, size_t *ret_num) {
+ _cleanup_free_ sd_dhcp_route **routes = NULL;
+ int r;
+
+ assert(link);
+ assert(link->dhcp_lease);
+
+ /* 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. */
+
+ r = sd_dhcp_lease_get_classless_routes(link->dhcp_lease, &routes);
+ if (r >= 0) {
+ assert(r > 0);
+ if (ret_routes)
+ *ret_routes = TAKE_PTR(routes);
+ if (ret_num)
+ *ret_num = r;
+ return 1; /* classless */
+ } else if (r != -ENODATA)
+ return r;
+
+ r = sd_dhcp_lease_get_static_routes(link->dhcp_lease, &routes);
+ if (r < 0)
+ return r;
+
+ assert(r > 0);
+ if (ret_routes)
+ *ret_routes = TAKE_PTR(routes);
+ if (ret_num)
+ *ret_num = r;
+ return 0; /* static */
+}
+
+static int dhcp4_find_gateway_for_destination(
+ Link *link,
+ const struct in_addr *destination,
+ uint8_t prefixlength,
+ bool allow_null,
+ struct in_addr *ret) {
+
+ _cleanup_free_ sd_dhcp_route **routes = NULL;
+ size_t n_routes = 0;
+ bool is_classless, reachable;
+ uint8_t max_prefixlen = UINT8_MAX;
+ struct in_addr gw;
+ int r;
+
+ assert(link);
+ assert(link->dhcp_lease);
+ assert(destination);
+ assert(ret);
+
+ /* This tries to find the most suitable gateway for an address or address range.
+ * E.g. if the server provides the default gateway 192.168.0.1 and a classless static route for
+ * 8.0.0.0/8 with gateway 192.168.0.2, then this returns 192.168.0.2 for 8.8.8.8/32, and 192.168.0.1
+ * for 9.9.9.9/32. If 'allow_null' flag is set, and the input address or address range is in the
+ * assigned network, then the default gateway will be ignored and the null address will be returned
+ * unless a matching non-default gateway found. */
+
+ r = dhcp4_prefix_covers(link, destination, prefixlength);
+ if (r < 0)
+ return r;
+ reachable = r > 0;
+
+ r = dhcp4_get_classless_static_or_static_routes(link, &routes, &n_routes);
+ if (r < 0 && r != -ENODATA)
+ return r;
+ is_classless = r > 0;
+
+ /* First, find most suitable gateway. */
+ FOREACH_ARRAY(e, routes, n_routes) {
+ struct in_addr dst;
+ uint8_t len;
+
+ r = sd_dhcp_route_get_destination(*e, &dst);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_route_get_destination_prefix_length(*e, &len);
+ if (r < 0)
+ return r;
+
+ r = in4_addr_prefix_covers_full(&dst, len, destination, prefixlength);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ if (max_prefixlen != UINT8_MAX && max_prefixlen > len)
+ continue;
+
+ r = sd_dhcp_route_get_gateway(*e, &gw);
+ if (r < 0)
+ return r;
+
+ max_prefixlen = len;
+ }
+
+ /* Found a suitable gateway in classless static routes or static routes. */
+ if (max_prefixlen != UINT8_MAX) {
+ if (max_prefixlen == 0 && reachable && allow_null)
+ /* Do not return the default gateway, if the destination is in the assigned network. */
+ *ret = (struct in_addr) {};
+ else
+ *ret = gw;
+ return 0;
+ }
+
+ /* When the destination is in the assigned network, return the null address if allowed. */
+ if (reachable && allow_null) {
+ *ret = (struct in_addr) {};
+ return 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. */
+ if (!is_classless) {
+ r = dhcp4_get_router(link, ret);
+ if (r >= 0)
+ return 0;
+ if (r != -ENODATA)
+ return r;
+ }
+
+ if (!reachable)
+ return -EHOSTUNREACH; /* Not in the same network, cannot reach the destination. */
+
+ assert(!allow_null);
+ return -ENODATA; /* No matching gateway found. */
+}
+
+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_and_drop(address);
+ if (k < 0)
+ r = k;
+ }
+
+ 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->network);
+ 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->quickack < 0)
+ route->quickack = link->network->dhcp_quickack;
+ if (route->initcwnd == 0)
+ route->initcwnd = link->network->dhcp_initial_congestion_window;
+ if (route->initrwnd == 0)
+ route->initrwnd = link->network->dhcp_advertised_receive_window;
+
+ 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;
+ 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 = route_new(&route);
+ if (r < 0)
+ return r;
+
+ route->scope = RT_SCOPE_LINK;
+
+ r = sd_dhcp_lease_get_prefix(link->dhcp_lease, &route->dst.in, &route->dst_prefixlen);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_lease_get_address(link->dhcp_lease, &route->prefsrc.in);
+ if (r < 0)
+ return r;
+
+ 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) {
+
+ _cleanup_(route_freep) Route *route = in;
+ struct in_addr address;
+ 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;
+
+ 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 (in4_addr_is_null(gw)) {
+ r = dhcp4_prefix_covers(link, &route->dst.in, route->dst_prefixlen);
+ if (r < 0)
+ return r;
+ if (r == 0 && DEBUG_LOGGING) {
+ struct in_addr prefix;
+ uint8_t prefixlen;
+
+ r = sd_dhcp_lease_get_prefix(link->dhcp_lease, &prefix, &prefixlen);
+ if (r < 0)
+ return r;
+
+ 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_classless_static_or_static_routes(Link *link) {
+ _cleanup_free_ sd_dhcp_route **routes = NULL;
+ size_t n_routes;
+ int r;
+
+ assert(link);
+ assert(link->dhcp_lease);
+
+ if (!link->network->dhcp_use_routes)
+ return 0;
+
+ r = dhcp4_get_classless_static_or_static_routes(link, &routes, &n_routes);
+ if (r == -ENODATA)
+ return 0;
+ if (r < 0)
+ return r;
+
+ FOREACH_ARRAY(e, routes, n_routes) {
+ _cleanup_(route_freep) Route *route = NULL;
+ struct in_addr gw;
+
+ r = route_new(&route);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_route_get_gateway(*e, &gw);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_route_get_destination(*e, &route->dst.in);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_route_get_destination_prefix_length(*e, &route->dst_prefixlen);
+ if (r < 0)
+ return r;
+
+ r = dhcp4_request_route_auto(TAKE_PTR(route), link, &gw);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int dhcp4_request_default_gateway(Link *link) {
+ _cleanup_(route_freep) Route *route = NULL;
+ struct in_addr address, router;
+ int r;
+
+ assert(link);
+ assert(link->dhcp_lease);
+
+ if (!link->network->dhcp_use_gateway)
+ return 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. */
+ if (link->network->dhcp_use_routes &&
+ dhcp4_get_classless_static_or_static_routes(link, NULL, NULL) > 0)
+ return 0;
+
+ r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
+ if (r < 0)
+ return r;
+
+ r = dhcp4_get_router(link, &router);
+ if (r == -ENODATA) {
+ log_link_debug(link, "DHCP: No valid router address received from DHCP server.");
+ return 0;
+ }
+ if (r < 0)
+ return r;
+
+ /* 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);
+ 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;
+ route->prefsrc.in = address;
+
+ return dhcp4_request_route(TAKE_PTR(route), link);
+}
+
+static int dhcp4_request_semi_static_routes(Link *link) {
+ Route *rt;
+ int r;
+
+ assert(link);
+ assert(link->dhcp_lease);
+ assert(link->network);
+
+ HASHMAP_FOREACH(rt, link->network->routes_by_section) {
+ _cleanup_(route_freep) Route *route = NULL;
+ struct in_addr gw;
+
+ if (!rt->gateway_from_dhcp_or_ra)
+ continue;
+
+ if (rt->gw_family != AF_INET)
+ continue;
+
+ assert(rt->family == AF_INET);
+
+ r = dhcp4_find_gateway_for_destination(link, &rt->dst.in, rt->dst_prefixlen, /* allow_null = */ false, &gw);
+ if (IN_SET(r, -EHOSTUNREACH, -ENODATA)) {
+ log_link_debug_errno(link, r, "DHCP: Cannot find suitable gateway for destination %s of semi-static route, ignoring: %m",
+ IN4_ADDR_PREFIX_TO_STRING(&rt->dst.in, rt->dst_prefixlen));
+ continue;
+ }
+ if (r < 0)
+ return r;
+
+ 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) {
+
+ int r;
+
+ assert(link);
+ assert(link->dhcp_lease);
+ assert(link->network);
+ assert(servers || n_servers == 0);
+
+ FOREACH_ARRAY(dst, servers, n_servers) {
+ _cleanup_(route_freep) Route *route = NULL;
+ struct in_addr gw;
+
+ if (in4_addr_is_null(dst))
+ continue;
+
+ r = dhcp4_find_gateway_for_destination(link, dst, 32, /* allow_null = */ true, &gw);
+ if (r == -EHOSTUNREACH) {
+ log_link_debug_errno(link, r, "DHCP: Cannot find suitable gateway for destination %s, ignoring: %m",
+ IN4_ADDR_PREFIX_TO_STRING(dst, 32));
+ continue;
+ }
+ if (r < 0)
+ return r;
+
+ r = route_new(&route);
+ if (r < 0)
+ return r;
+
+ route->dst.in = *dst;
+ route->dst_prefixlen = 32;
+
+ 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 *dns;
+ int r;
+
+ assert(link);
+ assert(link->dhcp_lease);
+ assert(link->network);
+
+ 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);
+}
+
+static int dhcp4_request_routes_to_ntp(Link *link) {
+ const struct in_addr *ntp;
+ int r;
+
+ assert(link);
+ assert(link->dhcp_lease);
+ assert(link->network);
+
+ 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);
+}
+
+static int dhcp4_request_routes(Link *link) {
+ 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_default_gateway(link);
+ if (r < 0)
+ return log_link_error_errno(link, r, "DHCP error: Could not request default gateway: %m");
+
+ r = dhcp4_request_classless_static_or_static_routes(link);
+ if (r < 0)
+ return log_link_error_errno(link, r, "DHCP error: Could not request static routes: %m");
+
+ r = dhcp4_request_semi_static_routes(link);
+ 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);
+ 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);
+ 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 &&
+ sd_dhcp_lease_has_6rd(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, server;
+ uint8_t 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_prefix(link->dhcp_lease, NULL, &prefixlen);
+ 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)) {
+ r = sd_dhcp_lease_get_lifetime_timestamp(link->dhcp_lease, CLOCK_BOOTTIME, &lifetime_usec);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "DHCP error: failed to get lifetime: %m");
+ } else
+ lifetime_usec = USEC_INFINITY;
+
+ 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;
+ r = sd_dhcp_lease_get_broadcast(link->dhcp_lease, &addr->broadcast);
+ if (r < 0 && r != -ENODATA)
+ return log_link_warning_errno(link, r, "DHCP: failed to get broadcast address: %m");
+ 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, addr, &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 (sd_dhcp_lease_has_6rd(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 (sd_dhcp_lease_has_6rd(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 &&
+ sd_dhcp_lease_has_6rd(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->raw_data_len == 0)
+ switch (duid->type) {
+ case DUID_TYPE_LLT:
+ r = sd_dhcp_client_set_iaid_duid_llt(link->dhcp_client,
+ link->network->dhcp_iaid_set,
+ link->network->dhcp_iaid,
+ duid->llt_time);
+ break;
+ case DUID_TYPE_LL:
+ r = sd_dhcp_client_set_iaid_duid_ll(link->dhcp_client,
+ link->network->dhcp_iaid_set,
+ link->network->dhcp_iaid);
+ break;
+ case DUID_TYPE_EN:
+ r = sd_dhcp_client_set_iaid_duid_en(link->dhcp_client,
+ link->network->dhcp_iaid_set,
+ link->network->dhcp_iaid);
+ break;
+ case DUID_TYPE_UUID:
+ r = sd_dhcp_client_set_iaid_duid_uuid(link->dhcp_client,
+ link->network->dhcp_iaid_set,
+ link->network->dhcp_iaid);
+ break;
+ default:
+ r = sd_dhcp_client_set_iaid_duid_raw(link->dhcp_client,
+ link->network->dhcp_iaid_set,
+ link->network->dhcp_iaid,
+ duid->type, NULL, 0);
+ }
+ else
+ r = sd_dhcp_client_set_iaid_duid_raw(link->dhcp_client,
+ link->network->dhcp_iaid_set,
+ link->network->dhcp_iaid,
+ duid->type, duid->raw_data, duid->raw_data_len);
+ if (r < 0)
+ return r;
+ 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_find_dynamic_address(Link *link, struct in_addr *ret) {
+ Address *a;
+
+ assert(link);
+ assert(link->network);
+ assert(ret);
+
+ if (!FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
+ return false;
+
+ 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 false;
+
+ *ret = a->in_addr.in;
+ return true;
+}
+
+static int dhcp4_set_request_address(Link *link) {
+ struct in_addr a;
+
+ assert(link);
+ assert(link->network);
+ assert(link->dhcp_client);
+
+ a = link->network->dhcp_request_address;
+
+ if (in4_addr_is_null(&a))
+ (void) dhcp4_find_dynamic_address(link, &a);
+
+ if (in4_addr_is_null(&a))
+ return 0;
+
+ log_link_debug(link, "DHCPv4 CLIENT: requesting %s.", IN4_ADDR_TO_STRING(&a));
+ return sd_dhcp_client_set_request_address(link->dhcp_client, &a);
+}
+
+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 bool link_dhcp4_ipv6_only_mode(Link *link) {
+ assert(link);
+ assert(link->network);
+
+ /* If it is explicitly specified, then honor the setting. */
+ if (link->network->dhcp_ipv6_only_mode >= 0)
+ return link->network->dhcp_ipv6_only_mode;
+
+ /* Defaults to false, until we support 464XLAT. See issue #30891. */
+ return false;
+}
+
+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_attach_device(link->dhcp_client, link->dev);
+ if (r < 0)
+ return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to attach device: %m");
+
+ r = sd_dhcp_client_set_rapid_commit(link->dhcp_client, link->network->dhcp_use_rapid_commit);
+ if (r < 0)
+ return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set rapid commit: %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");
+
+ r = dhcp_client_set_state_callback(link->dhcp_client, dhcp_client_callback_bus, link);
+ if (r < 0)
+ return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set state change callback: %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) {
+ 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");
+
+ 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_captive_portal) {
+ r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_DHCP_CAPTIVE_PORTAL);
+ if (r < 0)
+ return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for captive portal: %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");
+ }
+
+ if (link_dhcp4_ipv6_only_mode(link)) {
+ r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_IPV6_ONLY_PREFERRED);
+ if (r < 0)
+ return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for IPv6-only preferred option: %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_socket_priority_set) {
+ r = sd_dhcp_client_set_socket_priority(link->dhcp_client, link->network->dhcp_socket_priority);
+ if (r < 0)
+ return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set socket priority: %m");
+ }
+
+ if (link->network->dhcp_fallback_lease_lifetime_usec > 0) {
+ r = sd_dhcp_client_set_fallback_lease_lifetime(link->dhcp_client, link->network->dhcp_fallback_lease_lifetime_usec);
+ if (r < 0)
+ return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed set to lease lifetime: %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 = dhcp4_start(link);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+int dhcp4_update_ipv6_connectivity(Link *link) {
+ assert(link);
+
+ if (!link->network)
+ return 0;
+
+ if (!link->network->dhcp_ipv6_only_mode)
+ return 0;
+
+ if (!link->dhcp_client)
+ return 0;
+
+ /* If the client is running, set the current connectivity. */
+ if (sd_dhcp_client_is_running(link->dhcp_client))
+ return sd_dhcp_client_set_ipv6_connectivity(link->dhcp_client, link_has_ipv6_connectivity(link));
+
+ /* If the client has been already stopped or not started yet, let's check the current connectivity
+ * and start the client if necessary. */
+ if (link_has_ipv6_connectivity(link))
+ return 0;
+
+ return dhcp4_start_full(link, /* set_ipv6_connectivity = */ false);
+}
+
+int dhcp4_start_full(Link *link, bool set_ipv6_connectivity) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+
+ 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;
+
+ if (set_ipv6_connectivity) {
+ r = dhcp4_update_ipv6_connectivity(link);
+ if (r < 0)
+ return r;
+ }
+
+ return 1;
+}
+
+int dhcp4_renew(Link *link) {
+ assert(link);
+
+ if (!link->dhcp_client)
+ return 0;
+
+ /* The DHCPv4 client may have been stopped by the IPv6 only mode. Let's unconditionally restart the
+ * client if it is not running. */
+ if (!sd_dhcp_client_is_running(link->dhcp_client))
+ return dhcp4_start(link);
+
+ /* The client may be waiting for IPv6 connectivity. Let's restart the client in that case. */
+ if (dhcp_client_get_state(link->dhcp_client) != DHCP_STATE_BOUND)
+ return sd_dhcp_client_interrupt_ipv6_only_mode(link->dhcp_client);
+
+ /* Otherwise, send a RENEW command. */
+ return sd_dhcp_client_send_renew(link->dhcp_client);
+}
+
+static int dhcp4_configure_duid(Link *link) {
+ assert(link);
+ assert(link->network);
+
+ if (link->network->dhcp_client_identifier != DHCP_CLIENT_ID_DUID)
+ 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_socket_priority(
+ 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);
+ int a, r;
+
+ assert(lvalue);
+ assert(rvalue);
+
+ if (isempty(rvalue)) {
+ network->dhcp_socket_priority_set = false;
+ return 0;
+ }
+
+ r = safe_atoi(rvalue, &a);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to parse socket priority, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ network->dhcp_socket_priority_set = true;
+ network->dhcp_socket_priority = a;
+
+ 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_usec = 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_usec = USEC_INFINITY;
+
+ 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",
+};
+
+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");
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-13 08:58:26 +0000