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diff --git a/src/ceph/src/common/pick_address.h b/src/ceph/src/common/pick_address.h
new file mode 100644
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--- /dev/null
+++ b/src/ceph/src/common/pick_address.h
@@ -0,0 +1,57 @@
+#ifndef CEPH_PICK_ADDRESS_H
+#define CEPH_PICK_ADDRESS_H
+
+#include "common/config.h"
+
+class CephContext;
+
+
+#define CEPH_PICK_ADDRESS_PUBLIC     0x01
+#define CEPH_PICK_ADDRESS_CLUSTER    0x02
+
+/*
+  Pick addresses based on subnets if needed.
+
+  If an address is not explicitly given, and a list of subnets is
+  given, find an assigned IP address in the subnets and set that.
+
+  cluster_addr is set based on cluster_network, public_addr is set
+  based on public_network.
+
+  cluster_network and public_network are a list of ip/prefix pairs.
+
+  All IP addresses assigned to all local network interfaces are
+  potential matches.
+
+  If multiple IP addresses match the subnet, one of them will be
+  picked, effectively randomly.
+
+  This function will exit on error.
+ */
+void pick_addresses(CephContext *cct, int needs);
+
+/**
+ * Find a network interface whose address matches the address/netmask
+ * in `network`.
+ */
+std::string pick_iface(CephContext *cct, const struct sockaddr_storage &network);
+
+/**
+ * check for a locally configured address
+ *
+ * check if any of the listed addresses is configured on the local host.
+ *
+ * @param cct context
+ * @param ls list of addresses
+ * @param match [out] pointer to match, if an item in @a ls is found configured locally.
+ */
+bool have_local_addr(CephContext *cct, const list<entity_addr_t>& ls, entity_addr_t *match);
+
+
+const struct sockaddr *find_ip_in_subnet_list(
+  CephContext *cct,
+  const struct ifaddrs *ifa,
+  const std::string &networks,
+  const std::string &interfaces);
+
+#endif