1 files changed, 100 insertions, 0 deletions
diff --git a/src/network/netdev/netdev-util.c b/src/network/netdev/netdev-util.c
new file mode 100644
index 0000000..6229992
--- /dev/null
+++ b/src/network/netdev/netdev-util.c
@@ -0,0 +1,100 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "netdev-util.h"
+#include "networkd-address.h"
+#include "networkd-link.h"
+#include "string-table.h"
+
+static const char * const netdev_local_address_type_table[_NETDEV_LOCAL_ADDRESS_TYPE_MAX] = {
+        [NETDEV_LOCAL_ADDRESS_IPV4LL] = "ipv4_link_local",
+        [NETDEV_LOCAL_ADDRESS_IPV6LL] = "ipv6_link_local",
+        [NETDEV_LOCAL_ADDRESS_DHCP4]  = "dhcp4",
+        [NETDEV_LOCAL_ADDRESS_DHCP6]  = "dhcp6",
+        [NETDEV_LOCAL_ADDRESS_SLAAC]  = "slaac",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(netdev_local_address_type, NetDevLocalAddressType);
+
+int link_get_local_address(
+                Link *link,
+                NetDevLocalAddressType type,
+                int family,
+                int *ret_family,
+                union in_addr_union *ret_address) {
+
+        Address *a;
+
+        assert(link);
+
+        switch (type) {
+        case NETDEV_LOCAL_ADDRESS_IPV4LL:
+                assert(IN_SET(family, AF_UNSPEC, AF_INET));
+                family = AF_INET;
+                break;
+        case NETDEV_LOCAL_ADDRESS_IPV6LL:
+                assert(IN_SET(family, AF_UNSPEC, AF_INET6));
+                family = AF_INET6;
+                break;
+        case NETDEV_LOCAL_ADDRESS_DHCP4:
+                assert(IN_SET(family, AF_UNSPEC, AF_INET));
+                family = AF_INET;
+                break;
+        case NETDEV_LOCAL_ADDRESS_DHCP6:
+                assert(IN_SET(family, AF_UNSPEC, AF_INET6));
+                family = AF_INET6;
+                break;
+        case NETDEV_LOCAL_ADDRESS_SLAAC:
+                assert(IN_SET(family, AF_UNSPEC, AF_INET6));
+                family = AF_INET6;
+                break;
+        default:
+                assert_not_reached();
+        }
+
+        if (!link_is_ready_to_configure(link, /* allow_unmanaged = */ false))
+                return -EBUSY;
+
+        SET_FOREACH(a, link->addresses) {
+                if (!address_is_ready(a))
+                        continue;
+
+                if (a->family != family)
+                        continue;
+
+                if (in_addr_is_set(a->family, &a->in_addr_peer))
+                        continue;
+
+                switch (type) {
+                case NETDEV_LOCAL_ADDRESS_IPV4LL:
+                        if (a->source != NETWORK_CONFIG_SOURCE_IPV4LL)
+                                continue;
+                        break;
+                case NETDEV_LOCAL_ADDRESS_IPV6LL:
+                        if (!in6_addr_is_link_local(&a->in_addr.in6))
+                                continue;
+                        break;
+                case NETDEV_LOCAL_ADDRESS_DHCP4:
+                        if (a->source != NETWORK_CONFIG_SOURCE_DHCP4)
+                                continue;
+                        break;
+                case NETDEV_LOCAL_ADDRESS_DHCP6:
+                        if (a->source != NETWORK_CONFIG_SOURCE_DHCP6)
+                                continue;
+                        break;
+                case NETDEV_LOCAL_ADDRESS_SLAAC:
+                        if (a->source != NETWORK_CONFIG_SOURCE_NDISC)
+                                continue;
+                        break;
+                default:
+                        assert_not_reached();
+                }
+
+                if (ret_family)
+                        *ret_family = a->family;
+                if (ret_address)
+                        *ret_address = a->in_addr;
+                return 1;
+        }
+
+        return -ENXIO;
+}